Added new IBM PCI Hotplug controller driver.

Written by Irene Zubarev, Tong Yu, Jyoti Shah, Chuck Cole, and me.

drivers/hotplug/Config.help

@@ -29,3 +29,14 @@ CONFIG_HOTPLUG_PCI_COMPAQ_NVRAM
 
   When in doubt, say N.
 
+CONFIG_HOTPLUG_PCI_IBM
+  Say Y here if you have a motherboard with a IBM PCI Hotplug
+  controller.
+
+  This code is also available as a module ( = code which can be
+  inserted in and removed from the running kernel whenever you want).
+  The module will be called cpqphp.o. If you want to compile it
+  as a module, say M here and read <file:Documentation/modules.txt>.
+
+  When in doubt, say N.
+

drivers/hotplug/Config.in

@@ -4,9 +4,10 @@
 mainmenu_option next_comment
 comment 'PCI Hotplug Support'
 
-dep_tristate 'Support for PCI Hotplug (EXPERIMENTAL)' CONFIG_HOTPLUG_PCI $CONFIG_DDFS $CONFIG_EXPERIMENTAL
+dep_tristate 'Support for PCI Hotplug (EXPERIMENTAL)' CONFIG_HOTPLUG_PCI $CONFIG_PCI $CONFIG_EXPERIMENTAL 
 
-dep_tristate '  Compaq PCI Hotplug driver' CONFIG_HOTPLUG_PCI_COMPAQ $CONFIG_HOTPLUG_PCI
+dep_tristate '  Compaq PCI Hotplug driver' CONFIG_HOTPLUG_PCI_COMPAQ $CONFIG_HOTPLUG_PCI $CONFIG_X86
 dep_mbool '    Save configuration into NVRAM on Compaq servers' CONFIG_HOTPLUG_PCI_COMPAQ_NVRAM $CONFIG_HOTPLUG_PCI_COMPAQ
+dep_tristate '  IBM PCI Hotplug driver' CONFIG_HOTPLUG_PCI_IBM $CONFIG_HOTPLUG_PCI $CONFIG_X86_IO_APIC $CONFIG_X86
 
 endmenu

drivers/hotplug/Makefile

@@ -4,12 +4,13 @@
 
 O_TARGET	:= vmlinux-obj.o
 
-list-multi	:= cpqphp.o pci_hotplug.o
+list-multi	:= cpqphp.o pci_hotplug.o ibmphp.o
 
 export-objs	:= pci_hotplug_core.o pci_hotplug_util.o
 
 obj-$(CONFIG_HOTPLUG_PCI)		+= pci_hotplug.o
 obj-$(CONFIG_HOTPLUG_PCI_COMPAQ)	+= cpqphp.o
+obj-$(CONFIG_HOTPLUG_PCI_IBM)		+= ibmphp.o
 
 pci_hotplug-objs	:=	pci_hotplug_core.o	\
 				pci_hotplug_util.o
@@ -19,6 +20,12 @@ cpqphp-objs		:=	cpqphp_core.o	\
 				cpqphp_proc.o	\
 				cpqphp_pci.o
 
+ibmphp-objs		:=	ibmphp_core.o	\
+				ibmphp_ebda.o	\
+				ibmphp_pci.o	\
+				ibmphp_res.o	\
+				ibmphp_hpc.o
+
 ifeq ($(CONFIG_HOTPLUG_PCI_COMPAQ_NVRAM),y)
 	cpqphp-objs += cpqphp_nvram.o
 endif
@@ -32,3 +39,6 @@ pci_hotplug.o: $(pci_hotplug-objs)
 cpqphp.o: $(cpqphp-objs)
 	$(LD) -r -o $@ $(cpqphp-objs)
 
+ibmphp.o: $(ibmphp-objs)
+	$(LD) -r -o $@ $(ibmphp-objs)
+

drivers/hotplug/ibmphp.h

+#ifndef __IBMPHP_H
+#define __IBMPHP_H
+
+/*
+ * IBM Hot Plug Controller Driver
+ *
+ * Written By: Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation
+ *
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (c) 2001,2002 IBM Corp.
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <gregkh@us.ibm.com>
+ *
+ */
+
+#include "pci_hotplug.h"
+
+extern int ibmphp_debug;
+
+#if !defined(CONFIG_HOTPLUG_PCI_IBM_MODULE)
+	#define MY_NAME "ibmphpd"
+#else
+	#define MY_NAME THIS_MODULE->name
+#endif
+#define debug(fmt, arg...) do { if (ibmphp_debug) printk(KERN_DEBUG "%s: " fmt , MY_NAME , ## arg); } while (0)
+#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
+#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
+#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
+
+
+/* EBDA stuff */
+
+/***********************************************************
+* SLOT CAPABILITY                                          *
+***********************************************************/
+
+#define EBDA_SLOT_133_MAX		0x20
+#define EBDA_SLOT_100_MAX		0x10
+#define EBDA_SLOT_66_MAX		0x02
+#define EBDA_SLOT_PCIX_CAP		0x08
+
+
+/************************************************************
+*  RESOURE TYPE                                             *
+************************************************************/
+
+#define EBDA_RSRC_TYPE_MASK		0x03
+#define EBDA_IO_RSRC_TYPE		0x00
+#define EBDA_MEM_RSRC_TYPE		0x01
+#define EBDA_PFM_RSRC_TYPE		0x03
+#define EBDA_RES_RSRC_TYPE		0x02
+
+
+/*************************************************************
+*  IO RESTRICTION TYPE                                       *
+*************************************************************/
+
+#define EBDA_IO_RESTRI_MASK		0x0c
+#define EBDA_NO_RESTRI			0x00
+#define EBDA_AVO_VGA_ADDR		0x04
+#define EBDA_AVO_VGA_ADDR_AND_ALIA	0x08
+#define EBDA_AVO_ISA_ADDR		0x0c
+
+
+/**************************************************************
+*  DEVICE TYPE DEF                                            *
+**************************************************************/
+
+#define EBDA_DEV_TYPE_MASK		0x10
+#define EBDA_PCI_DEV			0x10
+#define EBDA_NON_PCI_DEV		0x00
+
+
+/***************************************************************
+*  PRIMARY DEF DEFINITION                                      *
+***************************************************************/
+
+#define EBDA_PRI_DEF_MASK		0x20
+#define EBDA_PRI_PCI_BUS_INFO		0x20
+#define EBDA_NORM_DEV_RSRC_INFO		0x00
+
+
+//--------------------------------------------------------------
+// RIO TABLE DATA STRUCTURE
+//--------------------------------------------------------------
+
+struct rio_table_hdr {
+	u8 ver_num; 
+	u8 scal_count;
+	u8 riodev_count;
+	u16 offset;
+};
+
+//-------------------------------------------------------------
+// SCALABILITY DETAIL
+//-------------------------------------------------------------
+
+struct scal_detail {
+	u8 node_id;
+	u32 cbar;
+	u8 port0_node_connect;
+	u8 port0_port_connect;
+	u8 port1_node_connect;
+	u8 port1_port_connect;
+	u8 port2_node_connect;
+	u8 port2_port_connect;
+//	struct list_head scal_detail_list;
+};
+
+//--------------------------------------------------------------
+// RIO DETAIL 
+//--------------------------------------------------------------
+
+struct rio_detail {
+	u8 rio_node_id;
+	u32 bbar;
+	u8 rio_type;
+	u8 owner_id;
+	u8 port0_node_connect;
+	u8 port0_port_connect;
+	u8 port1_node_connect;
+	u8 port1_port_connect;
+	u8 first_slot_num;
+	u8 status;
+//	struct list_head rio_detail_list;
+};
+
+
+/****************************************************************
+*  HPC DESCRIPTOR NODE                                          *
+****************************************************************/
+
+struct ebda_hpc_list {
+	u8 format;
+	u16 num_ctlrs;
+	short phys_addr;
+//      struct list_head ebda_hpc_list;
+};
+
+/*****************************************************************
+*   IN HPC DATA STRUCTURE, THE ASSOCIATED SLOT AND BUS           *
+*   STRUCTURE                                                    *
+*****************************************************************/
+
+struct ebda_hpc_slot {
+	u8 slot_num;
+	u32 slot_bus_num;
+	u8 ctl_index;
+	u8 slot_cap;
+};
+
+struct ebda_hpc_bus {
+	u32 bus_num;
+/*
+	u8 slots_at_33_conv;
+	u8 slots_at_66_conv;
+	u8 slots_at_66_pcix;
+	u8 slots_at_100_pcix;
+	u8 slots_at_133_pcix;
+*/
+};
+
+
+/********************************************************************
+*   THREE TYPE OF HOT PLUG CONTROLER                                *
+********************************************************************/
+
+struct isa_ctlr_access {
+	u16 io_start;
+	u16 io_end;
+};
+
+struct pci_ctlr_access {
+	u8 bus;
+	u8 dev_fun;
+};
+
+struct wpeg_i2c_ctlr_access {
+	ulong wpegbbar;
+	u8 i2c_addr;
+};
+
+/*************************************************************************
+*   RSTC DESCRIPTOR NODE                                                 *
+*************************************************************************/
+
+struct ebda_rsrc_list {
+	u8 format;
+	u16 num_entries;
+	u16 phys_addr;
+	struct ebda_rsrc_list *next;
+};
+
+
+/***************************************************************************
+*   PCI RSRC NODE                                                          *
+***************************************************************************/
+
+struct ebda_pci_rsrc {
+	u8 rsrc_type;
+	u8 bus_num;
+	u8 dev_fun;
+	ulong start_addr;
+	ulong end_addr;
+	struct list_head ebda_pci_rsrc_list;
+};
+
+
+/***********************************************************
+* BUS_INFO DATE STRUCTURE                                  *
+***********************************************************/
+
+struct bus_info {
+	u8 slot_min;
+	u8 slot_max;
+	u8 slot_count;
+	u8 busno;
+	u8 current_speed;
+	u8 supported_speed;
+	u8 controller_id;
+	u8 supported_bus_mode;
+	u8 current_bus_mode;
+	u8 index;
+	struct list_head bus_info_list;
+};
+
+
+/***********************************************************
+* GLOBAL VARIABLES                                         *
+***********************************************************/
+extern struct list_head ibmphp_ebda_pci_rsrc_head;
+extern struct list_head ibmphp_slot_head;
+
+/***********************************************************
+* FUNCTION PROTOTYPES                                      *
+***********************************************************/
+
+extern void ibmphp_free_ebda_hpc_queue (void);
+extern int ibmphp_access_ebda (void);
+extern struct slot *ibmphp_get_slot_from_physical_num (u8);
+extern int ibmphp_get_total_hp_slots (void);
+extern void ibmphp_free_ibm_slot (struct slot *);
+extern void ibmphp_free_bus_info_queue (void);
+extern void ibmphp_free_ebda_pci_rsrc_queue (void);
+extern struct bus_info *ibmphp_find_same_bus_num (u32);
+extern int ibmphp_get_bus_index (u8);
+extern u16 ibmphp_get_total_controllers (void);
+
+/* passed parameters */
+#define MEM		0
+#define IO		1
+#define PFMEM		2
+
+/* bit masks */
+#define RESTYPE		0x03
+#define IOMASK		0x00	/* will need to take its complement */
+#define MMASK		0x01
+#define PFMASK		0x03
+#define PCIDEVMASK	0x10	/* we should always have PCI devices */
+#define PRIMARYBUSMASK	0x20
+
+/* pci specific defines */
+#define PCI_VENDOR_ID_NOTVALID		0xFFFF
+#define PCI_HEADER_TYPE_MULTIDEVICE	0x80
+#define PCI_HEADER_TYPE_MULTIBRIDGE	0x81
+
+#define LATENCY		0x64
+#define CACHE		64
+#define DEVICEENABLE	0x015F		/* CPQ has 0x0157 */
+
+#define IOBRIDGE	0x1000		/* 4k */
+#define MEMBRIDGE	0x100000	/* 1M */
+
+/* irqs */
+#define SCSI_IRQ	0x09
+#define LAN_IRQ		0x0A
+#define OTHER_IRQ	0x0B
+
+/* Data Structures */
+
+/* type is of the form x x xx xx
+ *                     | |  |  |_ 00 - I/O, 01 - Memory, 11 - PFMemory
+ *                     | |  - 00 - No Restrictions, 01 - Avoid VGA, 10 - Avoid
+ *                     | |    VGA and their aliases, 11 - Avoid ISA
+ *                     | - 1 - PCI device, 0 - non pci device
+ *                     - 1 - Primary PCI Bus Information (0 if Normal device)
+ * the IO restrictions [2:3] are only for primary buses
+ */
+
+
+/* we need this struct because there could be several resource blocks
+ * allocated per primary bus in the EBDA
+ */
+struct range_node {
+	int rangeno;
+	u32 start;
+	u32 end;
+	struct range_node *next;
+};
+
+struct bus_node {
+	u8 busno;
+	int noIORanges;
+	struct range_node *rangeIO;
+	int noMemRanges;
+	struct range_node *rangeMem;
+	int noPFMemRanges;
+	struct range_node *rangePFMem;
+	int needIOUpdate;
+	int needMemUpdate;
+	int needPFMemUpdate;
+	struct resource_node *firstIO;	/* first IO resource on the Bus */
+	struct resource_node *firstMem;	/* first memory resource on the Bus */
+	struct resource_node *firstPFMem;	/* first prefetchable memory resource on the Bus */
+	struct resource_node *firstPFMemFromMem;	/* when run out of pfmem available, taking from Mem */
+	struct list_head bus_list;
+};
+
+struct resource_node {
+	int rangeno;
+	u8 busno;
+	u8 devfunc;
+	u32 start;
+	u32 end;
+	u32 len;
+	int type;		/* MEM, IO, PFMEM */
+	u8 fromMem;		/* this is to indicate that the range is from
+				 * from the Memory bucket rather than from PFMem */
+	struct resource_node *next;
+	struct resource_node *nextRange;	/* for the other mem range on bus */
+};
+
+struct res_needed {
+	u32 mem;
+	u32 pfmem;
+	u32 io;
+	u8 not_correct;		/* needed for return */
+	int devices[32];	/* for device numbers behind this bridge */
+};
+
+/* functions */
+
+extern int ibmphp_rsrc_init (void);
+extern int ibmphp_add_resource (struct resource_node *);
+extern int ibmphp_remove_resource (struct resource_node *);
+extern int ibmphp_find_resource (struct bus_node *, u32, struct resource_node **, int);
+extern int ibmphp_check_resource (struct resource_node *, u8);
+extern int ibmphp_remove_bus (struct bus_node *, u8);
+extern void ibmphp_free_resources (void);
+extern int ibmphp_add_pfmem_from_mem (struct resource_node *);
+extern struct bus_node *ibmphp_find_res_bus (u8);
+extern void ibmphp_print_test (void);	/* for debugging purposes */
+
+extern void ibmphp_hpc_initvars (void);
+extern int ibmphp_hpc_readslot (struct slot *, u8, u8 *);
+extern int ibmphp_hpc_writeslot (struct slot *, u8);
+extern void ibmphp_lock_operations (void);
+extern void ibmphp_unlock_operations (void);
+extern int ibmphp_hpc_fillhpslotinfo (struct hotplug_slot *);
+extern int ibmphp_hpc_start_poll_thread (void);
+extern void ibmphp_hpc_stop_poll_thread (void);
+
+//----------------------------------------------------------------------------
+
+
+//----------------------------------------------------------------------------
+// HPC return codes
+//----------------------------------------------------------------------------
+#define FALSE				0x00
+#define TRUE				0x01
+#define HPC_ERROR			0xFF
+
+//-----------------------------------------------------------------------------
+// BUS INFO
+//-----------------------------------------------------------------------------
+#define BUS_SPEED			0x30
+#define BUS_MODE			0x40
+#define BUS_MODE_PCIX			0x01
+#define BUS_MODE_PCI			0x00
+#define BUS_SPEED_2			0x20
+#define BUS_SPEED_1			0x10
+#define BUS_SPEED_33			0x00
+#define BUS_SPEED_66			0x01
+#define BUS_SPEED_100			0x02
+#define BUS_SPEED_133			0x03
+#define BUS_SPEED_66PCIX		0x04
+#define BUS_SPEED_66UNKNOWN		0x05
+#define BUS_STATUS_AVAILABLE		0x01
+#define BUS_CONTROL_AVAILABLE		0x02
+#define SLOT_LATCH_REGS_SUPPORTED	0x10
+
+#define PRGM_MODEL_REV_LEVEL		0xF0
+#define MAX_ADAPTER_NONE		0x09
+
+//----------------------------------------------------------------------------
+// HPC 'write' operations/commands
+//----------------------------------------------------------------------------
+//	Command			Code	State	Write to reg
+//					Machine	at index
+//-------------------------	----	-------	------------
+#define HPC_CTLR_ENABLEIRQ	0x00	// N	15
+#define HPC_CTLR_DISABLEIRQ	0x01	// N	15
+#define HPC_SLOT_OFF		0x02	// Y	0-14
+#define HPC_SLOT_ON		0x03	// Y	0-14
+#define HPC_SLOT_ATTNOFF	0x04	// N	0-14
+#define HPC_SLOT_ATTNON		0x05	// N	0-14
+#define HPC_CTLR_CLEARIRQ	0x06	// N	15
+#define HPC_CTLR_RESET		0x07	// Y	15
+#define HPC_CTLR_IRQSTEER	0x08	// N	15
+#define HPC_BUS_33CONVMODE	0x09	// Y	31-34
+#define HPC_BUS_66CONVMODE	0x0A	// Y	31-34
+#define HPC_BUS_66PCIXMODE	0x0B	// Y	31-34
+#define HPC_BUS_100PCIXMODE	0x0C	// Y	31-34
+#define HPC_BUS_133PCIXMODE	0x0D	// Y	31-34
+#define HPC_ALLSLOT_OFF		0x11	// Y	15
+#define HPC_ALLSLOT_ON		0x12	// Y	15
+#define HPC_SLOT_BLINKLED	0x13	// N	0-14
+
+//----------------------------------------------------------------------------
+// read commands
+//----------------------------------------------------------------------------
+#define READ_SLOTSTATUS		0x01
+#define READ_EXTSLOTSTATUS	0x02
+#define READ_BUSSTATUS		0x03
+#define READ_CTLRSTATUS		0x04
+#define READ_ALLSTAT		0x05
+#define READ_ALLSLOT		0x06
+#define READ_SLOTLATCHLOWREG	0x07
+#define READ_REVLEVEL		0x08
+#define READ_HPCOPTIONS		0x09
+//----------------------------------------------------------------------------
+// slot status
+//----------------------------------------------------------------------------
+#define HPC_SLOT_POWER		0x01
+#define HPC_SLOT_CONNECT	0x02
+#define HPC_SLOT_ATTN		0x04
+#define HPC_SLOT_PRSNT2		0x08
+#define HPC_SLOT_PRSNT1		0x10
+#define HPC_SLOT_PWRGD		0x20
+#define HPC_SLOT_BUS_SPEED	0x40
+#define HPC_SLOT_LATCH		0x80
+
+//----------------------------------------------------------------------------
+// HPC_SLOT_POWER status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_POWER_OFF	0x00
+#define HPC_SLOT_POWER_ON	0x01
+
+//----------------------------------------------------------------------------
+// HPC_SLOT_CONNECT status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_CONNECTED	0x00
+#define HPC_SLOT_DISCONNECTED	0x01
+
+//----------------------------------------------------------------------------
+// HPC_SLOT_ATTN status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_ATTN_OFF	0x00
+#define HPC_SLOT_ATTN_ON	0x01
+#define HPC_SLOT_ATTN_BLINK	0x02
+
+//----------------------------------------------------------------------------
+// HPC_SLOT_PRSNT status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_EMPTY		0x00
+#define HPC_SLOT_PRSNT_7	0x01
+#define HPC_SLOT_PRSNT_15	0x02
+#define HPC_SLOT_PRSNT_25	0x03
+
+//----------------------------------------------------------------------------
+// HPC_SLOT_PWRGD status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_PWRGD_FAULT_NONE	0x00
+#define HPC_SLOT_PWRGD_GOOD		0x01
+
+//----------------------------------------------------------------------------
+// HPC_SLOT_BUS_SPEED status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_BUS_SPEED_OK	0x00
+#define HPC_SLOT_BUS_SPEED_MISM	0x01
+
+//----------------------------------------------------------------------------
+// HPC_SLOT_LATCH status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_LATCH_OPEN	0x01	// NOTE : in PCI spec bit off = open
+#define HPC_SLOT_LATCH_CLOSED	0x00	// NOTE : in PCI spec bit on  = closed
+
+
+//----------------------------------------------------------------------------
+// extended slot status
+//----------------------------------------------------------------------------
+#define HPC_SLOT_PCIX		0x01
+#define HPC_SLOT_SPEED1		0x02
+#define HPC_SLOT_SPEED2		0x04
+#define HPC_SLOT_BLINK_ATTN	0x08
+#define HPC_SLOT_RSRVD1		0x10
+#define HPC_SLOT_RSRVD2		0x20
+#define HPC_SLOT_BUS_MODE	0x40
+#define HPC_SLOT_RSRVD3		0x80
+
+//----------------------------------------------------------------------------
+// HPC_XSLOT_PCIX_CAP status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_PCIX_NO	0x00
+#define HPC_SLOT_PCIX_YES	0x01
+
+//----------------------------------------------------------------------------
+// HPC_XSLOT_SPEED status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_SPEED_33	0x00
+#define HPC_SLOT_SPEED_66	0x01
+#define HPC_SLOT_SPEED_133	0x02
+
+//----------------------------------------------------------------------------
+// HPC_XSLOT_ATTN_BLINK status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_ATTN_BLINK_OFF	0x00
+#define HPC_SLOT_ATTN_BLINK_ON	0x01
+
+//----------------------------------------------------------------------------
+// HPC_XSLOT_BUS_MODE status return codes
+//----------------------------------------------------------------------------
+#define HPC_SLOT_BUS_MODE_OK	0x00
+#define HPC_SLOT_BUS_MODE_MISM	0x01
+
+//----------------------------------------------------------------------------
+// Controller status
+//----------------------------------------------------------------------------
+#define HPC_CTLR_WORKING	0x01
+#define HPC_CTLR_FINISHED	0x02
+#define HPC_CTLR_RESULT0	0x04
+#define HPC_CTLR_RESULT1	0x08
+#define HPC_CTLR_RESULE2	0x10
+#define HPC_CTLR_RESULT3	0x20
+#define HPC_CTLR_IRQ_ROUTG	0x40
+#define HPC_CTLR_IRQ_PENDG	0x80
+
+//----------------------------------------------------------------------------
+// HPC_CTLR_WROKING status return codes
+//----------------------------------------------------------------------------
+#define HPC_CTLR_WORKING_NO	0x00
+#define HPC_CTLR_WORKING_YES	0x01
+
+//----------------------------------------------------------------------------
+// HPC_CTLR_FINISHED status return codes
+//----------------------------------------------------------------------------
+#define HPC_CTLR_FINISHED_NO	0x00
+#define HPC_CTLR_FINISHED_YES	0x01
+
+//----------------------------------------------------------------------------
+// HPC_CTLR_RESULT status return codes
+//----------------------------------------------------------------------------
+#define HPC_CTLR_RESULT_SUCCESS	0x00
+#define HPC_CTLR_RESULT_FAILED	0x01
+#define HPC_CTLR_RESULT_RSVD	0x02
+#define HPC_CTLR_RESULT_NORESP	0x03
+
+
+//----------------------------------------------------------------------------
+// macro for slot info
+//----------------------------------------------------------------------------
+#define SLOT_POWER(s)	((u8) ((s & HPC_SLOT_POWER) \
+	? HPC_SLOT_POWER_ON : HPC_SLOT_POWER_OFF))
+
+#define SLOT_CONNECT(s)	((u8) ((s & HPC_SLOT_CONNECT) \
+	? HPC_SLOT_DISCONNECTED : HPC_SLOT_CONNECTED))
+
+#define SLOT_ATTN(s,es)	((u8) ((es & HPC_SLOT_BLINK_ATTN) \
+	? HPC_SLOT_ATTN_BLINK \
+	: ((s & HPC_SLOT_ATTN) ? HPC_SLOT_ATTN_ON : HPC_SLOT_ATTN_OFF)))
+
+#define SLOT_PRESENT(s)	((u8) ((s & HPC_SLOT_PRSNT1) \
+	? ((s & HPC_SLOT_PRSNT2) ? HPC_SLOT_EMPTY : HPC_SLOT_PRSNT_15) \
+	: ((s & HPC_SLOT_PRSNT2) ? HPC_SLOT_PRSNT_25 : HPC_SLOT_PRSNT_7)))
+
+#define SLOT_PWRGD(s)	((u8) ((s & HPC_SLOT_PWRGD) \
+	? HPC_SLOT_PWRGD_GOOD : HPC_SLOT_PWRGD_FAULT_NONE))
+
+#define SLOT_BUS_SPEED(s)	((u8) ((s & HPC_SLOT_BUS_SPEED) \
+	? HPC_SLOT_BUS_SPEED_MISM : HPC_SLOT_BUS_SPEED_OK))
+
+#define SLOT_LATCH(s)	((u8) ((s & HPC_SLOT_LATCH) \
+	? HPC_SLOT_LATCH_CLOSED : HPC_SLOT_LATCH_OPEN))
+
+#define SLOT_PCIX(es)	((u8) ((es & HPC_SLOT_PCIX) \
+	? HPC_SLOT_PCIX_YES : HPC_SLOT_PCIX_NO))
+
+#define SLOT_SPEED(es)	((u8) ((es & HPC_SLOT_SPEED2) \
+	? ((es & HPC_SLOT_SPEED1) ? HPC_SLOT_SPEED_133   \
+				: HPC_SLOT_SPEED_66)   \
+	: HPC_SLOT_SPEED_33))
+
+#define SLOT_BUS_MODE(es)	((u8) ((es & HPC_SLOT_BUS_MODE) \
+	? HPC_SLOT_BUS_MODE_MISM : HPC_SLOT_BUS_MODE_OK))
+
+//--------------------------------------------------------------------------
+// macro for bus info
+//---------------------------------------------------------------------------
+#define CURRENT_BUS_SPEED(s)	((u8) (s & BUS_SPEED_2) \
+	? ((s & BUS_SPEED_1) ? BUS_SPEED_133 : BUS_SPEED_100) \
+	: ((s & BUS_SPEED_1) ? BUS_SPEED_66 : BUS_SPEED_33))
+
+#define CURRENT_BUS_MODE(s)	((u8) (s & BUS_MODE) ? BUS_MODE_PCIX : BUS_MODE_PCI)
+
+#define READ_BUS_STATUS(s)	((u8) (s->options & BUS_STATUS_AVAILABLE))
+
+#define READ_BUS_MODE(s)	((s->revision & PRGM_MODEL_REV_LEVEL) >= 0x20)
+
+#define SET_BUS_STATUS(s)	((u8) (s->options & BUS_CONTROL_AVAILABLE))
+
+#define READ_SLOT_LATCH(s)	((u8) (s->options & SLOT_LATCH_REGS_SUPPORTED))
+
+//----------------------------------------------------------------------------
+// macro for controller info
+//----------------------------------------------------------------------------
+#define CTLR_WORKING(c) ((u8) ((c & HPC_CTLR_WORKING) \
+	? HPC_CTLR_WORKING_YES : HPC_CTLR_WORKING_NO))
+#define CTLR_FINISHED(c) ((u8) ((c & HPC_CTLR_FINISHED) \
+	? HPC_CTLR_FINISHED_YES : HPC_CTLR_FINISHED_NO))
+#define CTLR_RESULT(c) ((u8) ((c & HPC_CTLR_RESULT1)  \
+	? ((c & HPC_CTLR_RESULT0) ? HPC_CTLR_RESULT_NORESP \
+				: HPC_CTLR_RESULT_RSVD)  \
+	: ((c & HPC_CTLR_RESULT0) ? HPC_CTLR_RESULT_FAILED \
+				: HPC_CTLR_RESULT_SUCCESS)))
+
+// command that affect the state machine of HPC
+#define NEEDTOCHECK_CMDSTATUS(c) ((c == HPC_SLOT_OFF)        || \
+				  (c == HPC_SLOT_ON)         || \
+				  (c == HPC_CTLR_RESET)      || \
+				  (c == HPC_BUS_33CONVMODE)  || \
+				  (c == HPC_BUS_66CONVMODE)  || \
+				  (c == HPC_BUS_66PCIXMODE)  || \
+				  (c == HPC_BUS_100PCIXMODE) || \
+				  (c == HPC_BUS_133PCIXMODE) || \
+				  (c == HPC_ALLSLOT_OFF)     || \
+				  (c == HPC_ALLSLOT_ON))
+
+
+/* Core part of the driver */
+
+#define ENABLE		1
+#define DISABLE		0
+
+#define ADD		0
+#define REMOVE		1
+#define DETAIL		2
+
+#define MAX_OPS		3
+#define CARD_INFO	0x07
+#define PCIX133		0x07
+#define PCIX66		0x05
+#define PCI66		0x04
+
+extern struct pci_ops *ibmphp_pci_root_ops;
+
+/* Variables */
+
+struct pci_func {
+	struct pci_dev *dev;	/* from the OS */
+	u8 busno;
+	u8 device;
+	u8 function;
+	struct resource_node *io[6];
+	struct resource_node *mem[6];
+	struct resource_node *pfmem[6];
+	struct pci_func *next;
+	int devices[32];	/* for bridge config */
+	u8 irq[4];		/* for interrupt config */
+	u8 bus;			/* flag for unconfiguring, to say if PPB */
+};
+
+struct slot {
+	u8 bus;
+	u8 device;
+	u8 number;
+	char name[100];
+	u32 capabilities;
+	struct hotplug_slot *hotplug_slot;
+	struct controller *ctrl;
+	struct pci_func *func;
+	u8 irq[4];
+	u8 flag;		/* this is for disable slot and polling */
+	int bit_mode;		/* 0 = 32, 1 = 64 */
+	u8 ctlr_index;
+	struct bus_info *bus_on;
+	struct list_head ibm_slot_list;
+	u8 status;
+	u8 ext_status;
+	u8 busstatus;
+};
+
+struct controller {
+	struct ebda_hpc_slot *slots;
+	struct ebda_hpc_bus *buses;
+	u8 revision;
+	u8 options;		/* which options HPC supports */
+	u8 status;
+	u8 ctlr_id;		/* TONI */
+	u8 slot_count;
+	u8 bus_count;
+	u8 ctlr_relative_id;
+	u32 irq;
+	union {
+		struct isa_ctlr_access isa_ctlr;
+		struct pci_ctlr_access pci_ctlr;
+		struct wpeg_i2c_ctlr_access wpeg_ctlr;
+	} u;
+	u8 ctlr_type;
+	struct list_head ebda_hpc_list;
+};
+
+/* Functions */
+
+extern int ibmphp_init_devno (struct slot **);	/* This function is called from EBDA, so we need it not be static */
+extern int ibmphp_disable_slot (struct hotplug_slot *);	/* This function is called from HPC, so we need it to not be static */
+extern int ibmphp_update_slot_info (struct slot *);	/* This function is called from HPC, so we need it to not be be static */
+extern int ibmphp_configure_card (struct pci_func *, u8);
+extern int ibmphp_unconfigure_card (struct slot **, int);
+extern struct hotplug_slot_ops ibmphp_hotplug_slot_ops;
+
+static inline void long_delay (int delay)
+{
+	set_current_state (TASK_INTERRUPTIBLE);
+	schedule_timeout (delay);
+}
+
+#endif				//__IBMPHP_H
+

drivers/hotplug/ibmphp_core.c

+/*
+ * IBM Hot Plug Controller Driver
+ *
+ * Written By: Chuck Cole, Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation
+ *
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (c) 2001,2002 IBM Corp.
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <gregkh@us.ibm.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/smp_lock.h>
+#include "../../arch/i386/kernel/pci-i386.h"	/* for struct irq_routing_table */
+#include "ibmphp.h"
+
+#define attn_on(sl)  ibmphp_hpc_writeslot (sl, HPC_SLOT_ATTNON)
+#define attn_off(sl) ibmphp_hpc_writeslot (sl, HPC_SLOT_ATTNOFF)
+#define attn_LED_blink(sl) ibmphp_hpc_writeslot (sl, HPC_SLOT_BLINKLED)
+#define get_ctrl_revision(sl, rev) ibmphp_hpc_readslot (sl, READ_REVLEVEL, rev)
+#define get_hpc_options(sl, opt) ibmphp_hpc_readslot (sl, READ_HPCOPTIONS, opt)
+
+#define DRIVER_VERSION	"0.1"
+#define DRIVER_DESC	"IBM Hot Plug PCI Controller Driver"
+
+int ibmphp_debug;
+
+static int debug;
+MODULE_PARM (debug, "i");
+MODULE_PARM_DESC (debug, "Debugging mode enabled or not");
+MODULE_LICENSE ("GPL");
+MODULE_DESCRIPTION (DRIVER_DESC);
+
+static int *ops[MAX_OPS + 1];
+static struct pci_ops *ibmphp_pci_root_ops;
+static int max_slots;
+
+static int irqs[16];    /* PIC mode IRQ's we're using so far (in case MPS tables don't provide default info for empty slots */
+
+static int init_flag;
+
+/*
+static int get_max_adapter_speed_1 (struct hotplug_slot *, u8 *, u8);
+
+static inline int get_max_adapter_speed (struct hotplug_slot *hs, u8 *value)
+{
+	return get_max_adapter_speed_1 (hs, value, 1);
+}
+*/
+static inline int get_cur_bus_info (struct slot **sl) 
+{
+	int rc = 1;
+	struct slot * slot_cur = *sl;
+
+	debug ("options = %x\n", slot_cur->ctrl->options);
+	debug ("revision = %x\n", slot_cur->ctrl->revision);	
+
+	if (READ_BUS_STATUS (slot_cur->ctrl)) 
+		rc = ibmphp_hpc_readslot (slot_cur, READ_BUSSTATUS, NULL);
+	
+	if (rc) 
+		return rc;
+	  
+	slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED (slot_cur->busstatus);
+	if (READ_BUS_MODE (slot_cur->ctrl))
+		slot_cur->bus_on->current_bus_mode = CURRENT_BUS_MODE (slot_cur->busstatus);
+
+	debug ("busstatus = %x, bus_speed = %x, bus_mode = %x\n", slot_cur->busstatus, slot_cur->bus_on->current_speed, slot_cur->bus_on->current_bus_mode);
+	
+	*sl = slot_cur;
+	return 0;
+}
+
+static inline int slot_update (struct slot **sl)
+{
+	int rc;
+ 	rc = ibmphp_hpc_readslot (*sl, READ_ALLSTAT, NULL);
+	if (rc) 
+		return rc;
+	if (!init_flag)
+		return get_cur_bus_info (sl);
+	return rc;
+}
+
+static int get_max_slots (void)
+{
+	struct list_head * tmp;
+	int slot_count = 0;
+
+	list_for_each (tmp, &ibmphp_slot_head) 
+		++slot_count;
+	return slot_count;
+}
+
+/* This routine will put the correct slot->device information per slot.  It's
+ * called from initialization of the slot structures. It will also assign
+ * interrupt numbers per each slot.
+ * Parameters: struct slot
+ * Returns 0 or errors
+ */
+int ibmphp_init_devno (struct slot **cur_slot)
+{
+	struct irq_routing_table *rtable;
+	int len;
+	int loop;
+	int i;
+
+	rtable = pcibios_get_irq_routing_table ();
+	if (!rtable) {
+		err ("no BIOS routing table...\n");
+		return -ENOMEM;
+	}
+
+	len = (rtable->size - sizeof (struct irq_routing_table)) / sizeof (struct irq_info);
+
+	if (!len)
+		return -1;
+	for (loop = 0; loop < len; loop++) {
+		if ((*cur_slot)->number == rtable->slots[loop].slot) {
+		if ((*cur_slot)->bus == rtable->slots[loop].bus) {
+			(*cur_slot)->device = PCI_SLOT (rtable->slots[loop].devfn);
+			for (i = 0; i < 4; i++)
+				(*cur_slot)->irq[i] = IO_APIC_get_PCI_irq_vector ((int) (*cur_slot)->bus, (int) (*cur_slot)->device, i);
+
+				debug ("(*cur_slot)->irq[0] = %x\n", (*cur_slot)->irq[0]);
+				debug ("(*cur_slot)->irq[1] = %x\n", (*cur_slot)->irq[1]);
+				debug ("(*cur_slot)->irq[2] = %x\n", (*cur_slot)->irq[2]);
+				debug ("(*cur_slot)->irq[3] = %x\n", (*cur_slot)->irq[3]);
+
+				debug ("rtable->exlusive_irqs = %x\n", rtable->exclusive_irqs);
+				debug ("rtable->slots[loop].irq[0].bitmap = %x\n", rtable->slots[loop].irq[0].bitmap);
+				debug ("rtable->slots[loop].irq[1].bitmap = %x\n", rtable->slots[loop].irq[1].bitmap);
+				debug ("rtable->slots[loop].irq[2].bitmap = %x\n", rtable->slots[loop].irq[2].bitmap);
+				debug ("rtable->slots[loop].irq[3].bitmap = %x\n", rtable->slots[loop].irq[3].bitmap);
+
+				debug ("rtable->slots[loop].irq[0].link= %x\n", rtable->slots[loop].irq[0].link);
+				debug ("rtable->slots[loop].irq[1].link = %x\n", rtable->slots[loop].irq[1].link);
+				debug ("rtable->slots[loop].irq[2].link = %x\n", rtable->slots[loop].irq[2].link);
+				debug ("rtable->slots[loop].irq[3].link = %x\n", rtable->slots[loop].irq[3].link);
+				debug ("end of init_devno\n");
+				return 0;
+			}
+		}
+	}
+
+	return -1;
+}
+
+static inline int power_on (struct slot *slot_cur)
+{
+	u8 cmd = HPC_SLOT_ON;
+	int retval;
+
+	retval = ibmphp_hpc_writeslot (slot_cur, cmd);
+	if (retval) {
+		err ("power on failed\n");
+		return retval;
+	}
+	if (CTLR_RESULT (slot_cur->ctrl->status)) {
+		err ("command not completed successfully in power_on \n");
+		return -EIO;
+	}
+	long_delay (3 * HZ); /* For ServeRAID cards, and some 66 PCI */
+	return 0;
+}
+
+static inline int power_off (struct slot *slot_cur)
+{
+	u8 cmd = HPC_SLOT_OFF;
+	int retval;
+
+	retval = ibmphp_hpc_writeslot (slot_cur, cmd);
+	if (retval) {
+		err ("power off failed \n");
+		return retval;
+	}
+	if (CTLR_RESULT (slot_cur->ctrl->status)) {
+		err ("command not completed successfully in power_off \n");
+		return -EIO;
+	}
+	return 0;
+}
+
+static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 value)
+{
+	int rc = 0;
+	struct slot *pslot;
+	u8 cmd;
+	int hpcrc = 0;
+
+	debug ("set_attention_status - Entry hotplug_slot[%lx] value[%x]\n", (ulong) hotplug_slot, value);
+	ibmphp_lock_operations ();
+	cmd = 0x00;     // avoid compiler warning
+
+	if (hotplug_slot) {
+		switch (value) {
+		case HPC_SLOT_ATTN_OFF:
+			cmd = HPC_SLOT_ATTNOFF;
+			break;
+		case HPC_SLOT_ATTN_ON:
+			cmd = HPC_SLOT_ATTNON;
+			break;
+		case HPC_SLOT_ATTN_BLINK:
+			cmd = HPC_SLOT_BLINKLED;
+			break;
+		default:
+			rc = -ENODEV;
+			err ("set_attention_status - Error : invalid input [%x]\n", value);
+			break;
+		}
+		if (rc == 0) {
+			pslot = (struct slot *) hotplug_slot->private;
+			if (pslot)
+				hpcrc = ibmphp_hpc_writeslot (pslot, cmd);
+			else
+				rc = -ENODEV;
+		}
+	} else	
+		rc = -ENODEV;
+
+	if (hpcrc)
+		rc = hpcrc;
+
+	ibmphp_unlock_operations ();
+
+	debug ("set_attention_status - Exit rc[%d]\n", rc);
+	return rc;
+}
+
+static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 * value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	int hpcrc = 0;
+	struct slot myslot;
+
+	debug ("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", (ulong) hotplug_slot, (ulong) value);
+        
+	ibmphp_lock_operations ();
+	if (hotplug_slot && value) {
+		pslot = (struct slot *) hotplug_slot->private;
+		if (pslot) {
+			memcpy ((void *) &myslot, (void *) pslot, sizeof (struct slot));
+			hpcrc = ibmphp_hpc_readslot (pslot, READ_SLOTSTATUS, &(myslot.status));
+			if (!hpcrc)
+				hpcrc = ibmphp_hpc_readslot (pslot, READ_EXTSLOTSTATUS, &(myslot.ext_status));
+			if (!hpcrc) {
+				*value = SLOT_ATTN (myslot.status, myslot.ext_status);
+				rc = 0;
+			}
+		}
+	} else
+		rc = -ENODEV;
+
+	if (hpcrc)
+		rc = hpcrc;
+
+	ibmphp_unlock_operations ();
+	debug ("get_attention_status - Exit rc[%d] hpcrc[%x] value[%x]\n", rc, hpcrc, *value);
+	return rc;
+}
+
+static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 * value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	int hpcrc = 0;
+	struct slot myslot;
+
+	debug ("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", (ulong) hotplug_slot, (ulong) value);
+	ibmphp_lock_operations ();
+	if (hotplug_slot && value) {
+		pslot = (struct slot *) hotplug_slot->private;
+		if (pslot) {
+			memcpy ((void *) &myslot, (void *) pslot, sizeof (struct slot));
+			hpcrc = ibmphp_hpc_readslot (pslot, READ_SLOTSTATUS, &(myslot.status));
+			if (!hpcrc) {
+				*value = SLOT_LATCH (myslot.status);
+				rc = 0;
+			}
+		}
+	} else
+		rc = -ENODEV;
+
+	if (hpcrc)
+		rc = hpcrc;
+
+	ibmphp_unlock_operations ();
+	debug ("get_latch_status - Exit rc[%d] hpcrc[%x] value[%x]\n", rc, hpcrc, *value);
+	return rc;
+}
+
+
+static int get_power_status (struct hotplug_slot *hotplug_slot, u8 * value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	int hpcrc = 0;
+	struct slot myslot;
+
+	debug ("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", (ulong) hotplug_slot, (ulong) value);
+	ibmphp_lock_operations ();
+	if (hotplug_slot && value) {
+		pslot = (struct slot *) hotplug_slot->private;
+		if (pslot) {
+			memcpy ((void *) &myslot, (void *) pslot, sizeof (struct slot));
+			hpcrc = ibmphp_hpc_readslot (pslot, READ_SLOTSTATUS, &(myslot.status));
+			if (!hpcrc) {
+				*value = SLOT_POWER (myslot.status);
+				rc = 0;
+			}
+		}
+	} else
+		rc = -ENODEV;
+
+	if (hpcrc)
+		rc = hpcrc;
+
+	ibmphp_unlock_operations ();
+	debug ("get_power_status - Exit rc[%d] hpcrc[%x] value[%x]\n", rc, hpcrc, *value);
+	return rc;
+}
+
+static int get_adapter_present (struct hotplug_slot *hotplug_slot, u8 * value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	u8 present;
+	int hpcrc = 0;
+	struct slot myslot;
+
+	debug ("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", (ulong) hotplug_slot, (ulong) value);
+	ibmphp_lock_operations ();
+	if (hotplug_slot && value) {
+		pslot = (struct slot *) hotplug_slot->private;
+		if (pslot) {
+			memcpy ((void *) &myslot, (void *) pslot, sizeof (struct slot));
+			hpcrc = ibmphp_hpc_readslot (pslot, READ_SLOTSTATUS, &(myslot.status));
+			if (!hpcrc) {
+				present = SLOT_PRESENT (myslot.status);
+				if (present == HPC_SLOT_EMPTY)
+					*value = 0;
+				else
+					*value = 1;
+				rc = 0;
+			}
+		}
+	} else
+		rc = -ENODEV;
+	if (hpcrc)
+		rc = hpcrc;
+
+	ibmphp_unlock_operations ();
+	debug ("get_adapter_present - Exit rc[%d] hpcrc[%x] value[%x]\n", rc, hpcrc, *value);
+	return rc;
+}
+/*
+static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, u8 * value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	u8 mode = 0;
+
+	debug ("get_max_bus_speed - Entry hotplug_slot[%lx] pvalue[%lx]\n", (ulong)hotplug_slot, (ulong) value);
+
+	ibmphp_lock_operations ();
+
+	if (hotplug_slot && value) {
+		pslot = (struct slot *) hotplug_slot->private;
+		if (pslot) {
+			rc = 0;
+			mode = pslot->bus_on->supported_bus_mode;
+			*value = pslot->bus_on->supported_speed;
+			*value &= 0x0f;
+
+			if (mode == BUS_MODE_PCIX)
+				*value |= 0x80;
+			else if (mode == BUS_MODE_PCI)
+				*value |= 0x40;
+			else
+				*value |= 0x20;
+		}
+	} else
+		rc = -ENODEV;
+
+	ibmphp_unlock_operations ();
+	debug ("get_max_bus_speed - Exit rc[%d] value[%x]\n", rc, *value);
+	return rc;
+}
+
+static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, u8 * value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	u8 mode = 0;
+
+	debug ("get_cur_bus_speed - Entry hotplug_slot[%lx] pvalue[%lx]\n", (ulong)hotplug_slot, (ulong) value);
+
+	ibmphp_lock_operations ();
+
+	if (hotplug_slot && value) {
+		pslot = (struct slot *) hotplug_slot->private;
+		if (pslot) {
+			rc = get_cur_bus_info (&pslot);
+			if (!rc) {
+				mode = pslot->bus_on->current_bus_mode;
+				*value = pslot->bus_on->current_speed;
+				*value &= 0x0f;
+				
+				if (mode == BUS_MODE_PCIX)
+					*value |= 0x80;
+				else if (mode == BUS_MODE_PCI)
+					*value |= 0x40;
+				else
+					*value |= 0x20;	
+			}
+		}
+	} else
+		rc = -ENODEV;
+
+	ibmphp_unlock_operations ();
+	debug ("get_cur_bus_speed - Exit rc[%d] value[%x]\n", rc, *value);
+	return rc;
+}
+
+static int get_max_adapter_speed_1 (struct hotplug_slot *hotplug_slot, u8 * value, u8 flag)
+{
+	int rc = -ENODEV;
+	struct slot *pslot;
+	int hpcrc = 0;
+	struct slot myslot;
+
+	debug ("get_max_adapter_speed - Entry hotplug_slot[%lx] pvalue[%lx]\n", (ulong)hotplug_slot, (ulong) value);
+
+	if (flag)
+		ibmphp_lock_operations ();
+
+	if (hotplug_slot && value) {
+		pslot = (struct slot *) hotplug_slot->private;
+		if (pslot) {
+			memcpy ((void *) &myslot, (void *) pslot, sizeof (struct slot));
+			hpcrc = ibmphp_hpc_readslot (pslot, READ_SLOTSTATUS, &(myslot.status));
+
+			if (!(SLOT_LATCH (myslot.status)) && (SLOT_PRESENT (myslot.status))) {
+				hpcrc = ibmphp_hpc_readslot (pslot, READ_EXTSLOTSTATUS, &(myslot.ext_status));
+				if (!hpcrc) {
+					*value = SLOT_SPEED (myslot.ext_status);
+					rc = 0;
+				}
+			} else {
+				*value = MAX_ADAPTER_NONE;
+				rc = 0;
+			}
+                }
+        } else
+		rc = -ENODEV;
+
+	if (hpcrc)
+		rc = hpcrc;
+
+	if (flag)
+		ibmphp_unlock_operations ();
+
+	debug ("get_adapter_present - Exit rc[%d] hpcrc[%x] value[%x]\n", rc, hpcrc, *value);
+	return rc;
+}
+
+static int get_card_bus_names (struct hotplug_slot *hotplug_slot, char * value)
+{
+	int rc = -ENODEV;
+	struct slot *pslot = NULL;
+	struct pci_dev * dev = NULL;
+
+	debug ("get_card_bus_names - Entry hotplug_slot[%lx] \n", (ulong)hotplug_slot);
+
+	ibmphp_lock_operations ();
+
+	if (hotplug_slot) {
+		pslot = (struct slot *) hotplug_slot->private;
+		if (pslot) {
+			rc = 0;
+			if (pslot->func)
+				dev = pslot->func->dev;
+			else
+                		dev = pci_find_slot (pslot->bus, (pslot->device << 3) | (0x00 & 0x7));
+			if (dev) 
+				snprintf (value, 100, "Bus %d : %s", pslot->bus,dev->name);
+			else
+				snprintf (value, 100, "Bus %d", pslot->bus);
+			
+				
+		}
+	} else
+		rc = -ENODEV;
+
+	ibmphp_unlock_operations ();
+	debug ("get_card_bus_names - Exit rc[%d] value[%x]\n", rc, *value);
+	return rc;
+}
+
+*/
+/*******************************************************************************
+ * This routine will initialize the ops data structure used in the validate
+ * function. It will also power off empty slots that are powered on since BIOS
+ * leaves those on, albeit disconnected
+ ******************************************************************************/
+static int init_ops (void)
+{
+	struct slot *slot_cur;
+	int retval;
+	int j;
+	int rc;
+
+	for (j = 0; j < MAX_OPS; j++) {
+		ops[j] = (int *) kmalloc ((max_slots + 1) * sizeof (int), GFP_KERNEL);
+		if (!ops[j]) {
+			err ("out of system memory \n");
+			return -ENOMEM;
+		}
+	}
+
+	ops[ADD][0] = 0;
+	ops[REMOVE][0] = 0;
+	ops[DETAIL][0] = 0;
+
+	for (j = 1; j <= max_slots; j++) {
+
+		slot_cur = ibmphp_get_slot_from_physical_num (j);
+
+		debug ("BEFORE GETTING SLOT STATUS, slot # %x\n", slot_cur->number);
+
+		if (slot_cur->ctrl->revision == 0xFF) 
+			if (get_ctrl_revision (slot_cur, &slot_cur->ctrl->revision))
+				return -1;
+
+		if (slot_cur->bus_on->current_speed == 0xFF) 
+			if (get_cur_bus_info (&slot_cur)) 
+				return -1;
+
+		if (slot_cur->ctrl->options == 0xFF)
+			if (get_hpc_options (slot_cur, &slot_cur->ctrl->options))
+				return -1;
+
+		retval = slot_update (&slot_cur);
+		if (retval)
+			return retval;
+
+		debug ("status = %x, ext_status = %x\n", slot_cur->status, slot_cur->ext_status);
+		debug ("SLOT_POWER = %x, SLOT_PRESENT = %x, SLOT_LATCH = %x\n", SLOT_POWER (slot_cur->status), SLOT_PRESENT (slot_cur->status), SLOT_LATCH (slot_cur->status));
+
+		if (!(SLOT_POWER (slot_cur->status)) && (SLOT_PRESENT (slot_cur->status)) && !(SLOT_LATCH (slot_cur->status)))
+			/* No power, adapter, and latch closed */
+			ops[ADD][j] = 1;
+		else
+			ops[ADD][j] = 0;
+
+		ops[DETAIL][j] = 1;
+
+		if ((SLOT_POWER (slot_cur->status)) && (SLOT_PRESENT (slot_cur->status)) && !(SLOT_LATCH (slot_cur->status)))
+			/*Power,adapter,latch closed */
+			ops[REMOVE][j] = 1;
+		else
+			ops[REMOVE][j] = 0;
+
+		if ((SLOT_POWER (slot_cur->status)) && !(SLOT_PRESENT (slot_cur->status)) && !(SLOT_LATCH (slot_cur->status))) {
+			debug ("BEFORE POWER OFF COMMAND\n");
+				rc = power_off (slot_cur);
+				if (rc)
+					return rc;
+
+	/*		retval = slot_update (&slot_cur);
+	 *		if (retval)
+	 *			return retval;
+	 *		ibmphp_update_slot_info (slot_cur);
+	 */
+		}
+	}
+	init_flag = 0;
+	return 0;
+}
+
+/* This operation will check whether the slot is within the bounds and
+ * the operation is valid to perform on that slot
+ * Parameters: slot, operation
+ * Returns: 0 or error codes
+ */
+static int validate (struct slot *slot_cur, int opn)
+{
+	int number;
+	int retval;
+
+	if (!slot_cur)
+		return -ENODEV;
+	number = slot_cur->number;
+	if ((number > max_slots) || (number < 0))
+		return -EBADSLT;
+	debug ("slot_number in validate is %d\n", slot_cur->number);
+
+	retval = slot_update (&slot_cur);
+	if (retval)
+		return retval;
+
+	if (!(SLOT_POWER (slot_cur->status)) && (SLOT_PRESENT (slot_cur->status))
+	    && !(SLOT_LATCH (slot_cur->status)))
+		ops[ADD][number] = 1;
+	else
+		ops[ADD][number] = 0;
+
+	ops[DETAIL][number] = 1;
+
+	if ((SLOT_POWER (slot_cur->status)) && (SLOT_PRESENT (slot_cur->status))
+	    && !(SLOT_LATCH (slot_cur->status)))
+		ops[REMOVE][number] = 1;
+	else
+		ops[REMOVE][number] = 0;
+
+	switch (opn) {
+		case ENABLE:
+			if (ops[ADD][number])
+				return 0;
+			break;
+		case DISABLE:
+			if (ops[REMOVE][number])
+				return 0;
+			break;
+		case DETAIL:
+			if (ops[DETAIL][number])
+				return 0;
+			break;
+		default:
+			return -EINVAL;
+			break;
+	}
+	err ("validate failed....\n");
+	return -EINVAL;
+}
+
+/********************************************************************************
+ * This routine is for updating the data structures in the hotplug core
+ * Parameters: struct slot
+ * Returns: 0 or error
+ *******************************************************************************/
+int ibmphp_update_slot_info (struct slot *slot_cur)
+{
+	struct hotplug_slot_info *info;
+	char buffer[10];
+	int rc;
+//	u8 bus_speed;
+
+	info = kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL);
+	if (!info) {
+		err ("out of system memory \n");
+		return -ENOMEM;
+	}
+        
+	snprintf (buffer, 10, "%d", slot_cur->number);
+	info->power_status = SLOT_POWER (slot_cur->status);
+	info->attention_status = SLOT_ATTN (slot_cur->status, slot_cur->ext_status);
+	info->latch_status = SLOT_LATCH (slot_cur->status);
+        if (!SLOT_PRESENT (slot_cur->status)) {
+                info->adapter_status = 0;
+//		info->max_adapter_speed_status = MAX_ADAPTER_NONE;
+	} else {
+                info->adapter_status = 1;
+//		get_max_adapter_speed_1 (slot_cur->hotplug_slot, &info->max_adapter_speed_status, 0);
+	}
+/*
+	bus_speed = slot_cur->bus_on->current_speed;
+	bus_speed &= 0x0f;
+                        
+	if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX)
+		bus_speed |= 0x80;
+	else if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCI)
+		bus_speed |= 0x40;
+	else
+		bus_speed |= 0x20;
+
+	info->cur_bus_speed_status = bus_speed;
+	info->max_bus_speed_status = slot_cur->hotplug_slot->info->max_bus_speed_status;
+	// To do: card_bus_names 
+*/	
+	rc = pci_hp_change_slot_info (buffer, info);
+	kfree (info);
+	return rc;
+}
+
+
+/******************************************************************************
+ * This function will return the pci_func, given bus and devfunc, or NULL.  It
+ * is called from visit routines
+ ******************************************************************************/
+
+static struct pci_func *ibm_slot_find (u8 busno, u8 device, u8 function)
+{
+	struct pci_func *func_cur;
+	struct slot *slot_cur;
+	struct list_head * tmp;
+	list_for_each (tmp, &ibmphp_slot_head) {
+		slot_cur = list_entry (tmp, struct slot, ibm_slot_list);
+		if (slot_cur->func) {
+			func_cur = slot_cur->func;
+			while (func_cur) {
+				if ((func_cur->busno == busno) && (func_cur->device == device) && (func_cur->function == function))
+					return func_cur;
+				func_cur = func_cur->next;
+			}
+		}
+	}
+	return NULL;
+}
+
+/* This routine is to find the pci_bus from kernel structures.
+ * Parameters: bus number
+ * Returns : pci_bus *  or NULL if not found
+ */
+static struct pci_bus *find_bus (u8 busno)
+{
+	const struct list_head *tmp;
+	struct pci_bus *bus;
+	debug ("inside find_bus, busno = %x \n", busno);
+
+	list_for_each (tmp, &pci_root_buses) {
+		bus = (struct pci_bus *) pci_bus_b (tmp);
+		if (bus)
+			if (bus->number == busno)
+				return bus;
+	}
+	return NULL;
+}
+
+/******************************************************************
+ * This function is here because we can no longer use pci_root_ops
+ ******************************************************************/
+static struct pci_ops *get_root_pci_ops (void)
+{
+	struct pci_bus * bus;
+
+	if ((bus = find_bus (0)))
+		return bus->ops;
+	return NULL;
+}
+
+/*************************************************************
+ * This routine frees up memory used by struct slot, including
+ * the pointers to pci_func, bus, hotplug_slot, controller,
+ * and deregistering from the hotplug core
+ *************************************************************/
+static void free_slots (void)
+{
+	struct slot *slot_cur;
+	struct list_head * tmp;
+	struct list_head * next;
+
+	list_for_each_safe (tmp, next, &ibmphp_slot_head) {
+
+		slot_cur = list_entry (tmp, struct slot, ibm_slot_list);
+
+		pci_hp_deregister (slot_cur->hotplug_slot);
+
+		if (slot_cur->hotplug_slot) {
+			kfree (slot_cur->hotplug_slot);
+			slot_cur->hotplug_slot = NULL;
+		}
+
+		if (slot_cur->ctrl) 
+			slot_cur->ctrl = NULL;
+		
+		if (slot_cur->bus_on) 
+			slot_cur->bus_on = NULL;
+
+		ibmphp_unconfigure_card (&slot_cur, -1);  /* we don't want to actually remove the resources, since free_resources will do just that */
+
+		kfree (slot_cur);
+	}
+}
+
+static int ibm_is_pci_dev_in_use (struct pci_dev *dev)
+{
+	int i = 0;
+	int inuse = 0;
+
+	if (dev->driver)
+		return 1;
+
+	for (i = 0; !dev->driver && !inuse && (i < 6); i++) {
+
+		if (!pci_resource_start (dev, i))
+			continue;
+
+		if (pci_resource_flags (dev, i) & IORESOURCE_IO)
+			inuse = check_region (pci_resource_start (dev, i), pci_resource_len (dev, i));
+
+		else if (pci_resource_flags (dev, i) & IORESOURCE_MEM)
+			inuse = check_mem_region (pci_resource_start (dev, i), pci_resource_len (dev, i));
+	}
+
+	return inuse;
+}
+
+static int ibm_pci_hp_remove_device (struct pci_dev *dev)
+{
+	if (ibm_is_pci_dev_in_use (dev)) {
+		err ("***Cannot safely power down device -- it appears to be in use***\n");
+		return -EBUSY;
+	}
+	pci_remove_device (dev);
+	return 0;
+}
+
+static int ibm_unconfigure_visit_pci_dev_phase2 (struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_bus)
+{
+	struct pci_dev *dev = wrapped_dev->dev;
+	struct pci_func *temp_func;
+	int i = 0;
+
+	do {
+		temp_func = ibm_slot_find (dev->bus->number, dev->devfn >> 3, i++);
+	} while (temp_func && (temp_func->function != (dev->devfn & 0x07)));
+
+	if (dev) {
+		if (ibm_pci_hp_remove_device (dev) == 0)
+			kfree (dev);    /* Now, remove */
+		else
+			return -1;
+	}
+
+	if (temp_func)
+		temp_func->dev = NULL;
+	else
+		err ("No pci_func representation for bus, devfn = %d, %x\n", dev->bus->number, dev->devfn);
+
+	return 0;
+}
+
+static int ibm_unconfigure_visit_pci_bus_phase2 (struct pci_bus_wrapped *wrapped_bus, struct pci_dev_wrapped *wrapped_dev)
+{
+	struct pci_bus *bus = wrapped_bus->bus;
+
+	pci_proc_detach_bus (bus);
+	/* The cleanup code should live in the kernel... */
+	bus->self->subordinate = NULL;
+	/* unlink from parent bus */
+	list_del (&bus->node);
+
+	/* Now, remove */
+	if (bus)
+		kfree (bus);
+
+	return 0;
+}
+
+static int ibm_unconfigure_visit_pci_dev_phase1 (struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_bus)
+{
+	struct pci_dev *dev = wrapped_dev->dev;
+
+	debug ("attempting removal of driver for device (%x, %x, %x)\n", dev->bus->number, PCI_SLOT (dev->devfn), PCI_FUNC (dev->devfn));
+
+	/* Now, remove the Linux Driver Representation */
+	if (dev->driver) {
+		debug ("is there a driver?\n");
+		if (dev->driver->remove) {
+			dev->driver->remove (dev);
+			debug ("driver was properly removed\n");
+		}
+		dev->driver = NULL;
+	}
+
+	return ibm_is_pci_dev_in_use (dev);
+}
+
+static struct pci_visit ibm_unconfigure_functions_phase1 = {
+	post_visit_pci_dev:	ibm_unconfigure_visit_pci_dev_phase1,
+};
+
+static struct pci_visit ibm_unconfigure_functions_phase2 = {
+	post_visit_pci_bus:	ibm_unconfigure_visit_pci_bus_phase2,
+	post_visit_pci_dev:	ibm_unconfigure_visit_pci_dev_phase2,
+};
+
+static int ibm_unconfigure_device (struct pci_func *func)
+{
+	int rc = 0;
+	struct pci_dev_wrapped wrapped_dev;
+	struct pci_bus_wrapped wrapped_bus;
+	struct pci_dev *temp;
+	u8 j;
+
+	memset (&wrapped_dev, 0, sizeof (struct pci_dev_wrapped));
+	memset (&wrapped_bus, 0, sizeof (struct pci_bus_wrapped));
+
+	debug ("inside ibm_unconfigure_device\n");
+	debug ("func->device = %x, func->function = %x\n", func->device, func->function);
+	debug ("func->device << 3 | 0x0  = %x\n", func->device << 3 | 0x0);
+
+	for (j = 0; j < 0x08; j++) {
+		temp = pci_find_slot (func->busno, (func->device << 3) | j);
+		if (temp) {
+			wrapped_dev.dev = temp;
+			wrapped_bus.bus = temp->bus;
+			rc = pci_visit_dev (&ibm_unconfigure_functions_phase1, &wrapped_dev, &wrapped_bus);
+			if (rc)
+				break;
+
+			rc = pci_visit_dev (&ibm_unconfigure_functions_phase2, &wrapped_dev, &wrapped_bus);
+			if (rc)
+				break;
+		}
+	}
+	debug ("rc in ibm_unconfigure_device b4 returning is %d \n", rc);
+	return rc;
+}
+
+static int configure_visit_pci_dev (struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_bus)
+{
+	//      struct pci_bus *bus = wrapped_bus->bus; /* We don't need this, since we don't create in the else statement */
+	struct pci_dev *dev = wrapped_dev->dev;
+	struct pci_func *temp_func;
+	int i = 0;
+
+	do {
+		temp_func = ibm_slot_find (dev->bus->number, dev->devfn >> 3, i++);
+	} while (temp_func && (temp_func->function != (dev->devfn & 0x07)));
+
+	if (temp_func)
+		temp_func->dev = dev;
+	else {
+		/* This should not really happen, since we create functions
+		   first and then call to configure */
+		debug (" We shouldn't come here \n");
+	}
+
+	if (temp_func->dev) {
+		pci_proc_attach_device (temp_func->dev);
+		pci_announce_device_to_drivers (temp_func->dev);
+	}
+
+	return 0;
+}
+
+static struct pci_visit configure_functions = {
+	visit_pci_dev:	configure_visit_pci_dev,
+};
+
+static int ibm_configure_device (struct pci_func *func)
+{
+	unsigned char bus;
+	struct pci_dev dev0;
+	struct pci_bus *child;
+	struct pci_dev *temp;
+	int rc = 0;
+
+	struct pci_dev_wrapped wrapped_dev;
+	struct pci_bus_wrapped wrapped_bus;
+
+	memset (&wrapped_dev, 0, sizeof (struct pci_dev_wrapped));
+	memset (&wrapped_bus, 0, sizeof (struct pci_bus_wrapped));
+	memset (&dev0, 0, sizeof (struct pci_dev));
+
+	if (func->dev == NULL)
+		func->dev = pci_find_slot (func->busno, (func->device << 3) | (func->function & 0x7));
+
+	if (func->dev == NULL) {
+		dev0.bus = find_bus (func->busno);
+		dev0.devfn = ((func->device << 3) + (func->function & 0x7));
+		dev0.sysdata = dev0.bus->sysdata;
+
+		func->dev = pci_scan_slot (&dev0);
+
+		if (func->dev == NULL) {
+			err ("ERROR... : pci_dev still NULL \n");
+			return 0;
+		}
+	}
+	if (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+		pci_read_config_byte (func->dev, PCI_SECONDARY_BUS, &bus);
+		child = (struct pci_bus *) pci_add_new_bus (func->dev->bus, (func->dev), bus);
+		pci_do_scan_bus (child);
+	}
+
+	temp = func->dev;
+	if (temp) {
+		wrapped_dev.dev = temp;
+		wrapped_bus.bus = temp->bus;
+		rc = pci_visit_dev (&configure_functions, &wrapped_dev, &wrapped_bus);
+	}
+	return rc;
+}
+/*******************************************************
+ * Returns whether the bus is empty or not 
+ *******************************************************/
+static int is_bus_empty (struct slot * slot_cur)
+{
+	int rc;
+	struct slot * tmp_slot;
+	u8 i = slot_cur->bus_on->slot_min;
+
+	while (i <= slot_cur->bus_on->slot_max) {
+		if (i == slot_cur->number) {
+			i++;
+			continue;
+		}
+		tmp_slot = ibmphp_get_slot_from_physical_num (i);
+		rc = slot_update (&tmp_slot);
+		if (rc)
+			return 0;
+		if (SLOT_PRESENT (tmp_slot->status) && SLOT_POWER (tmp_slot->status))
+			return 0;
+		i++;
+	}
+	return 1;
+}
+
+/***********************************************************
+ * If the HPC permits and the bus currently empty, tries to set the 
+ * bus speed and mode at the maximum card capability
+ ***********************************************************/
+static int set_bus (struct slot * slot_cur)
+{
+	int rc;
+	u8 speed;
+	u8 cmd = 0x0;
+
+	debug ("%s - entry slot # %d \n", __FUNCTION__, slot_cur->number);
+	if (SET_BUS_STATUS (slot_cur->ctrl) && is_bus_empty (slot_cur)) {
+		rc = slot_update (&slot_cur);
+		if (rc)
+			return rc;
+		speed = SLOT_SPEED (slot_cur->ext_status);
+		debug ("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed);
+		switch (speed) {
+		case HPC_SLOT_SPEED_33:
+			cmd = HPC_BUS_33CONVMODE;
+			break;
+		case HPC_SLOT_SPEED_66:
+			if (SLOT_PCIX (slot_cur->ext_status))
+				cmd = HPC_BUS_66PCIXMODE;
+			else
+				cmd = HPC_BUS_66CONVMODE;
+			break;
+		case HPC_SLOT_SPEED_133:
+			if (slot_cur->bus_on->slot_count > 1)
+				cmd = HPC_BUS_100PCIXMODE;
+			else
+				cmd = HPC_BUS_133PCIXMODE;
+			break;
+		default:
+			err ("wrong slot speed \n");
+			return -ENODEV;
+		}
+		debug ("setting bus speed for slot %d, cmd %x\n", slot_cur->number, cmd);
+		rc = ibmphp_hpc_writeslot (slot_cur, cmd);
+		if (rc)
+			return rc;
+	}
+	debug ("%s -Exit \n", __FUNCTION__);
+	return 0;
+}
+
+static inline void print_card_capability (struct slot *slot_cur)
+{
+	info ("capability of the card is ");
+	if ((slot_cur->ext_status & CARD_INFO) == PCIX133) 
+		info ("   133 MHz PCI-X \n");
+	else if ((slot_cur->ext_status & CARD_INFO) == PCIX66)
+		info ("    66 MHz PCI-X \n");
+	else if ((slot_cur->ext_status & CARD_INFO) == PCI66)
+		info ("    66 MHz PCI \n");
+	else
+		info ("    33 MHz PCI \n");
+
+}
+
+/* This routine will power on the slot, configure the device(s) and find the
+ * drivers for them.
+ * Parameters: hotplug_slot
+ * Returns: 0 or failure codes
+ */
+static int enable_slot (struct hotplug_slot *hs)
+{
+	int rc, i, rcpr;
+	struct slot *slot_cur;
+	u8 function;
+	u8 faulted = 0;
+	struct pci_func *tmp_func;
+
+	ibmphp_lock_operations ();
+
+	debug ("ENABLING SLOT........ \n");
+	slot_cur = (struct slot *) hs->private;
+
+	if ((rc = validate (slot_cur, ENABLE))) {
+		err ("validate function failed \n");
+		attn_off (slot_cur);	/* need to turn off if was blinking b4 */
+		attn_on (slot_cur);
+		rc = slot_update (&slot_cur);
+		if (rc) {
+			ibmphp_unlock_operations();
+			return rc;
+		}
+		ibmphp_update_slot_info (slot_cur);
+                ibmphp_unlock_operations ();
+		return rc;
+	}
+
+	attn_LED_blink (slot_cur);
+	
+	rc = set_bus (slot_cur);
+	if (rc) {
+		err ("was not able to set the bus \n");
+		attn_off (slot_cur);
+		attn_on (slot_cur);
+		ibmphp_unlock_operations ();
+		return -ENODEV;
+	}
+		
+	rc = power_on (slot_cur);
+
+	if (rc) {
+		err ("something wrong when powering up... please see below for details\n");
+		/* need to turn off before on, otherwise, blinking overwrites */
+		attn_off(slot_cur);
+		attn_on (slot_cur);
+		if (slot_update (&slot_cur)) {
+			attn_off (slot_cur);
+			attn_on (slot_cur);
+			ibmphp_unlock_operations ();
+			return -ENODEV;
+		}
+		/* Check to see the error of why it failed */
+		if (!(SLOT_PWRGD (slot_cur->status)))
+			err ("power fault occured trying to power up \n");
+		else if (SLOT_BUS_SPEED (slot_cur->status)) {
+			err ("bus speed mismatch occured.  please check current bus speed and card capability \n");
+			print_card_capability (slot_cur);
+		} else if (SLOT_BUS_MODE (slot_cur->ext_status)) 
+			err ("bus mode mismatch occured.  please check current bus mode and card capability \n");
+
+		ibmphp_update_slot_info (slot_cur);
+		ibmphp_unlock_operations (); 
+		return rc;
+	}
+	debug ("after power_on\n");
+
+	rc = slot_update (&slot_cur);
+	if (rc) {
+		attn_off (slot_cur);
+		attn_on (slot_cur);
+		rcpr = power_off (slot_cur);
+		if (rcpr) {
+			ibmphp_unlock_operations ();
+			return rcpr;
+		}
+		ibmphp_unlock_operations ();
+		return rc;
+	}
+	
+	if (SLOT_POWER (slot_cur->status) && !(SLOT_PWRGD (slot_cur->status))) {
+		faulted = 1;
+		err ("power fault occured trying to power up...\n");
+	} else if (SLOT_POWER (slot_cur->status) && (SLOT_BUS_SPEED (slot_cur->status))) {
+		faulted = 1;
+		err ("bus speed mismatch occured.  please check current bus speed and card capability \n");
+		print_card_capability (slot_cur);
+	} 
+	/* Don't think this case will happen after above checks... but just in case, for paranoia sake */
+	else if (!(SLOT_POWER (slot_cur->status))) {
+		err ("power on failed... \n");
+		faulted = 1;
+	}
+	if (faulted) {
+		attn_off (slot_cur);	/* need to turn off b4 on */
+		attn_on (slot_cur);
+		rcpr = power_off (slot_cur);
+		if (rcpr) {
+			ibmphp_unlock_operations ();
+			return rcpr;
+		}
+			
+		if (slot_update (&slot_cur)) {
+			ibmphp_unlock_operations ();
+			return -ENODEV;
+		}
+		ibmphp_update_slot_info (slot_cur);
+		ibmphp_unlock_operations ();
+		return -EINVAL;
+	}
+
+	slot_cur->func = (struct pci_func *) kmalloc (sizeof (struct pci_func), GFP_KERNEL);
+	if (!slot_cur->func) { /* We cannot do update_slot_info here, since no memory for kmalloc n.e.ways, and update_slot_info allocates some */
+		err ("out of system memory \n");
+		attn_off (slot_cur);
+		attn_on (slot_cur);
+		rcpr = power_off (slot_cur);
+		if (rcpr) {
+			ibmphp_unlock_operations ();
+			return rcpr;
+		}
+		ibmphp_unlock_operations ();
+		return -ENOMEM;
+	}
+	memset (slot_cur->func, 0, sizeof (struct pci_func));
+	slot_cur->func->busno = slot_cur->bus;
+	slot_cur->func->device = slot_cur->device;
+	for (i = 0; i < 4; i++)
+		slot_cur->func->irq[i] = slot_cur->irq[i];
+
+	debug ("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n", slot_cur->bus, slot_cur->device);
+
+	if (ibmphp_configure_card (slot_cur->func, slot_cur->number)) {
+		err ("configure_card was unsuccessful... \n");
+		ibmphp_unconfigure_card (&slot_cur, 1); /* true because don't need to actually deallocate resources, just remove references */
+		debug ("after unconfigure_card\n");
+		slot_cur->func = NULL;
+		attn_off (slot_cur);	/* need to turn off in case was blinking */
+		attn_on (slot_cur);
+		rcpr = power_off (slot_cur);
+		if (rcpr) {
+			ibmphp_unlock_operations ();
+			return rcpr;
+		}
+		if (slot_update (&slot_cur)) {
+			ibmphp_unlock_operations();
+			return -ENODEV;
+		}
+		ibmphp_update_slot_info (slot_cur);
+		ibmphp_unlock_operations ();
+		return -ENOMEM;
+	}
+	function = 0x00;
+	do {
+		tmp_func = ibm_slot_find (slot_cur->bus, slot_cur->func->device, function++);
+		if (tmp_func && !(tmp_func->dev))
+			ibm_configure_device (tmp_func);
+	} while (tmp_func);
+
+	attn_off (slot_cur);
+	if (slot_update (&slot_cur)) {
+		ibmphp_unlock_operations ();
+		return -EFAULT;
+	}
+	ibmphp_print_test ();
+	rc = ibmphp_update_slot_info (slot_cur);
+	ibmphp_unlock_operations(); 
+	return rc;
+}
+
+/**************************************************************
+* HOT REMOVING ADAPTER CARD                                   *
+* INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE                *
+* OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE         *
+          DISABLE POWER ,                                    *
+**************************************************************/
+int ibmphp_disable_slot (struct hotplug_slot *hotplug_slot)
+{
+	int rc;
+	struct slot *slot_cur = (struct slot *) hotplug_slot->private;
+	u8 flag = slot_cur->flag;
+
+	slot_cur->flag = TRUE;
+	debug ("DISABLING SLOT... \n"); 
+		
+	ibmphp_lock_operations (); 
+	if (slot_cur == NULL) {
+		ibmphp_unlock_operations ();
+		return -ENODEV;
+	}
+	if (slot_cur->ctrl == NULL) {
+		ibmphp_unlock_operations ();
+		return -ENODEV;
+	}
+	if (flag == TRUE) {
+		rc = validate (slot_cur, DISABLE);	/* checking if powered off already & valid slot # */
+		if (rc) {
+			/*  Need to turn off if was blinking b4 */
+			attn_off (slot_cur);
+			attn_on (slot_cur);
+			if (slot_update (&slot_cur)) {
+				ibmphp_unlock_operations ();
+				return -EFAULT;
+			}
+		
+			ibmphp_update_slot_info (slot_cur);
+			ibmphp_unlock_operations ();
+			return rc;
+		}
+	}
+	attn_LED_blink (slot_cur);
+
+	if (slot_cur->func == NULL) {
+		/* We need this for fncs's that were there on bootup */
+		slot_cur->func = (struct pci_func *) kmalloc (sizeof (struct pci_func), GFP_KERNEL);
+		if (!slot_cur->func) {
+			err ("out of system memory \n");
+			attn_off (slot_cur);
+			attn_on (slot_cur);
+			ibmphp_unlock_operations ();
+			return -ENOMEM;
+		}
+		memset (slot_cur->func, 0, sizeof (struct pci_func));
+		slot_cur->func->busno = slot_cur->bus;
+		slot_cur->func->device = slot_cur->device;
+	}
+
+	if ((rc = ibm_unconfigure_device (slot_cur->func))) {
+		err ("removing from kernel failed... \n");
+		err ("Please check to see if it was statically linked or is in use otherwise. (perhaps the driver is not 'hot-removable')\n");
+		attn_off (slot_cur);
+		attn_on (slot_cur);
+		ibmphp_unlock_operations ();
+		return rc;
+	}
+
+	rc = ibmphp_unconfigure_card (&slot_cur, 0);
+	slot_cur->func = NULL;
+	debug ("in disable_slot. after unconfigure_card \n");
+	if (rc) {
+		err ("could not unconfigure card.\n");
+		attn_off (slot_cur);	/* need to turn off if was blinking b4 */
+		attn_on (slot_cur);
+
+		if (slot_update (&slot_cur)) {
+			ibmphp_unlock_operations ();
+			return -EFAULT;
+		}
+
+		if (flag) 
+			ibmphp_update_slot_info (slot_cur);
+
+		ibmphp_unlock_operations ();
+		return -EFAULT;
+	}
+
+	rc = ibmphp_hpc_writeslot (hotplug_slot->private, HPC_SLOT_OFF);
+	if (rc) {
+		attn_off (slot_cur);
+		attn_on (slot_cur);
+		if (slot_update (&slot_cur)) {
+			ibmphp_unlock_operations ();
+			return -EFAULT;
+		}
+
+		if (flag)
+			ibmphp_update_slot_info (slot_cur);
+
+		ibmphp_unlock_operations ();
+		return rc;
+	}
+
+	attn_off (slot_cur);
+	if (slot_update (&slot_cur)) {
+		ibmphp_unlock_operations ();
+		return -EFAULT;
+	}
+	if (flag) 
+		rc = ibmphp_update_slot_info (slot_cur);
+	else
+		rc = 0;
+
+	ibmphp_print_test ();
+	ibmphp_unlock_operations();
+	return rc;
+}
+
+struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
+	owner:				THIS_MODULE,
+	set_attention_status:		set_attention_status,
+	enable_slot:			enable_slot,
+	disable_slot:			ibmphp_disable_slot,
+	hardware_test:			NULL,
+	get_power_status:		get_power_status,
+	get_attention_status:		get_attention_status,
+	get_latch_status:		get_latch_status,
+	get_adapter_status:		get_adapter_present,
+/*	get_max_bus_speed_status:	get_max_bus_speed,
+	get_max_adapter_speed_status:	get_max_adapter_speed,
+	get_cur_bus_speed_status:	get_cur_bus_speed,
+	get_card_bus_names_status:	get_card_bus_names,
+*/
+};
+
+static void ibmphp_unload (void)
+{
+	free_slots ();
+	debug ("after slots \n");
+	ibmphp_free_resources ();
+	debug ("after resources \n");
+	ibmphp_free_bus_info_queue ();
+	debug ("after bus info \n");
+	ibmphp_free_ebda_hpc_queue ();
+	debug ("after ebda hpc \n");
+	ibmphp_free_ebda_pci_rsrc_queue ();
+	debug ("after ebda pci rsrc \n");
+}
+
+static int __init ibmphp_init (void)
+{
+	int i = 0;
+	int rc = 0;
+
+	init_flag = 1;
+	ibmphp_pci_root_ops = get_root_pci_ops ();
+	if (ibmphp_pci_root_ops == NULL) {
+		err ("cannot read bus operations... will not be able to read the cards.  Please check your system \n");
+		return -ENODEV;	
+	}
+
+	ibmphp_debug = debug;
+
+	ibmphp_hpc_initvars ();
+
+	for (i = 0; i < 16; i++)
+		irqs[i] = 0;
+
+	if ((rc = ibmphp_access_ebda ())) {
+		ibmphp_unload ();
+		return rc;
+	}
+	debug ("after ibmphp_access_ebda () \n");
+
+	if ((rc = ibmphp_rsrc_init ())) {
+		ibmphp_unload ();
+		return rc;
+	}
+	debug ("AFTER Resource & EBDA INITIALIZATIONS \n");
+
+	max_slots = get_max_slots ();
+
+	if (init_ops ()) {
+		ibmphp_unload ();
+		return -ENODEV;
+	}
+	ibmphp_print_test ();
+	if ((rc = ibmphp_hpc_start_poll_thread ())) {
+		ibmphp_unload ();
+		return -ENODEV;
+	}
+
+	/* lock ourselves into memory with a module count of -1 
+	 * so that no one can unload us. */
+	MOD_DEC_USE_COUNT;
+
+	info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
+
+	return 0;
+}
+
+static void __exit ibmphp_exit (void)
+{
+	ibmphp_hpc_stop_poll_thread ();
+	debug ("after polling \n");
+	ibmphp_unload ();
+	debug ("done \n");
+}
+
+module_init (ibmphp_init);
+module_exit (ibmphp_exit);

drivers/hotplug/ibmphp_ebda.c

+/*
+ * IBM Hot Plug Controller Driver
+ *
+ * Written By: Tong Yu, IBM Corporation
+ *
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (c) 2001,2002 IBM Corp.
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <gregkh@us.ibm.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/list.h>
+#include "ibmphp.h"
+
+/*
+ * POST builds data blocks(in this data block definition, a char-1
+ * byte, short(or word)-2 byte, long(dword)-4 byte) in the Extended
+ * BIOS Data Area which describe the configuration of the hot-plug
+ * controllers and resources used by the PCI Hot-Plug devices.
+ *
+ * This file walks EBDA, maps data block from physical addr,
+ * reconstruct linked lists about all system resource(MEM, PFM, IO)
+ * already assigned by POST, as well as linked lists about hot plug
+ * controllers (ctlr#, slot#, bus&slot features...)
+ */
+
+/* Global lists */
+LIST_HEAD (ibmphp_ebda_pci_rsrc_head);
+LIST_HEAD (ibmphp_slot_head);
+
+/* Local variables */
+static struct ebda_hpc_list *hpc_list_ptr;
+static struct ebda_rsrc_list *rsrc_list_ptr;
+static struct rio_table_hdr *rio_table_ptr;
+static LIST_HEAD (ebda_hpc_head);
+static LIST_HEAD (bus_info_head);
+static void *io_mem;
+
+/* Local functions */
+static int ebda_rsrc_controller (void);
+static int ebda_rsrc_rsrc (void);
+static int ebda_rio_table (void);
+
+static struct slot *alloc_ibm_slot (void)
+{
+	struct slot *slot;
+
+	slot = kmalloc (sizeof (struct slot), GFP_KERNEL);
+	if (!slot)
+		return NULL;
+	memset (slot, 0, sizeof (*slot));
+	return slot;
+}
+
+static struct ebda_hpc_list *alloc_ebda_hpc_list (void)
+{
+	struct ebda_hpc_list *list;
+
+	list = kmalloc (sizeof (struct ebda_hpc_list), GFP_KERNEL);
+	if (!list)
+		return NULL;
+	memset (list, 0, sizeof (*list));
+	return list;
+}
+
+static struct controller *alloc_ebda_hpc (u32 slot_count, u32 bus_count)
+{
+	struct controller *controller;
+	struct ebda_hpc_slot *slots;
+	struct ebda_hpc_bus *buses;
+
+	controller = kmalloc (sizeof (struct controller), GFP_KERNEL);
+	if (!controller)
+		return NULL;
+	memset (controller, 0, sizeof (*controller));
+
+	slots = kmalloc (sizeof (struct ebda_hpc_slot) * slot_count, GFP_KERNEL);
+	if (!slots) {
+		kfree (controller);
+		return NULL;
+	}
+	memset (slots, 0, sizeof (*slots) * slot_count);
+	controller->slots = slots;
+
+	buses = kmalloc (sizeof (struct ebda_hpc_bus) * bus_count, GFP_KERNEL);
+	if (!buses) {
+		kfree (controller->slots);
+		kfree (controller);
+		return NULL;
+	}
+	memset (buses, 0, sizeof (*buses) * bus_count);
+	controller->buses = buses;
+
+	return controller;
+}
+
+static void free_ebda_hpc (struct controller *controller)
+{
+	kfree (controller->slots);
+	controller->slots = NULL;
+	kfree (controller->buses);
+	controller->buses = NULL;
+	kfree (controller);
+}
+
+static struct ebda_rsrc_list *alloc_ebda_rsrc_list (void)
+{
+	struct ebda_rsrc_list *list;
+
+	list = kmalloc (sizeof (struct ebda_rsrc_list), GFP_KERNEL);
+	if (!list)
+		return NULL;
+	memset (list, 0, sizeof (*list));
+	return list;
+}
+
+static struct ebda_pci_rsrc *alloc_ebda_pci_rsrc (void)
+{
+	struct ebda_pci_rsrc *resource;
+
+	resource = kmalloc (sizeof (struct ebda_pci_rsrc), GFP_KERNEL);
+	if (!resource)
+		return NULL;
+	memset (resource, 0, sizeof (*resource));
+	return resource;
+}
+
+static void print_bus_info (void)
+{
+	struct bus_info *ptr;
+	struct list_head *ptr1;
+	
+	list_for_each (ptr1, &bus_info_head) {
+		ptr = list_entry (ptr1, struct bus_info, bus_info_list);
+		debug ("%s - slot_min = %x\n", __FUNCTION__, ptr->slot_min);
+		debug ("%s - slot_max = %x\n", __FUNCTION__, ptr->slot_max);
+		debug ("%s - slot_count = %x\n", __FUNCTION__, ptr->slot_count);
+		debug ("%s - bus# = %x\n", __FUNCTION__, ptr->busno);
+		debug ("%s - current_speed = %x\n", __FUNCTION__, ptr->current_speed);
+		debug ("%s - supported_speed = %x\n", __FUNCTION__, ptr->supported_speed);
+		debug ("%s - controller_id = %x\n", __FUNCTION__, ptr->controller_id);
+		debug ("%s - bus_mode = %x\n", __FUNCTION__, ptr->supported_bus_mode);
+	}
+}
+
+static void print_ebda_pci_rsrc (void)
+{
+	struct ebda_pci_rsrc *ptr;
+	struct list_head *ptr1;
+
+	list_for_each (ptr1, &ibmphp_ebda_pci_rsrc_head) {
+		ptr = list_entry (ptr1, struct ebda_pci_rsrc, ebda_pci_rsrc_list);
+		debug ("%s - rsrc type: %x bus#: %x dev_func: %x start addr: %lx end addr: %lx\n", 
+			__FUNCTION__, ptr->rsrc_type ,ptr->bus_num, ptr->dev_fun,ptr->start_addr, ptr->end_addr);
+	}
+}
+
+static void print_ebda_hpc (void)
+{
+	struct controller *hpc_ptr;
+	struct list_head *ptr1;
+	u16 index;
+
+	list_for_each (ptr1, &ebda_hpc_head) {
+
+		hpc_ptr = list_entry (ptr1, struct controller, ebda_hpc_list); 
+
+		for (index = 0; index < hpc_ptr->slot_count; index++) {
+			debug ("%s - physical slot#: %x\n", __FUNCTION__, hpc_ptr->slots[index].slot_num);
+			debug ("%s - pci bus# of the slot: %x\n", __FUNCTION__, hpc_ptr->slots[index].slot_bus_num);
+			debug ("%s - index into ctlr addr: %x\n", __FUNCTION__, hpc_ptr->slots[index].ctl_index);
+			debug ("%s - cap of the slot: %x\n", __FUNCTION__, hpc_ptr->slots[index].slot_cap);
+		}
+
+		for (index = 0; index < hpc_ptr->bus_count; index++) {
+			debug ("%s - bus# of each bus controlled by this ctlr: %x\n", __FUNCTION__, hpc_ptr->buses[index].bus_num);
+		}
+
+		debug ("%s - type of hpc: %x\n", __FUNCTION__, hpc_ptr->ctlr_type);
+		switch (hpc_ptr->ctlr_type) {
+		case 1:
+			debug ("%s - bus: %x\n", __FUNCTION__, hpc_ptr->u.pci_ctlr.bus);
+			debug ("%s - dev_fun: %x\n", __FUNCTION__, hpc_ptr->u.pci_ctlr.dev_fun);
+			debug ("%s - irq: %x\n", __FUNCTION__, hpc_ptr->irq);
+			break;
+
+		case 0:
+			debug ("%s - io_start: %x\n", __FUNCTION__, hpc_ptr->u.isa_ctlr.io_start);
+			debug ("%s - io_end: %x\n", __FUNCTION__, hpc_ptr->u.isa_ctlr.io_end);
+			debug ("%s - irq: %x\n", __FUNCTION__, hpc_ptr->irq);
+			break;
+
+		case 2:
+			debug ("%s - wpegbbar: %lx\n", __FUNCTION__, hpc_ptr->u.wpeg_ctlr.wpegbbar);
+			debug ("%s - i2c_addr: %x\n", __FUNCTION__, hpc_ptr->u.wpeg_ctlr.i2c_addr);
+			debug ("%s - irq: %x\n", __FUNCTION__, hpc_ptr->irq);
+			break;
+		}
+	}
+}
+
+int ibmphp_access_ebda (void)
+{
+	u8 format, num_ctlrs, rio_complete, hs_complete;
+	u16 ebda_seg, num_entries, next_offset, offset, blk_id, sub_addr, rc, re, rc_id, re_id, base;
+
+
+	rio_complete = 0;
+	hs_complete = 0;
+
+	io_mem = ioremap ((0x40 << 4) + 0x0e, 2);
+	if (!io_mem )
+		return -ENOMEM;
+	ebda_seg = readw (io_mem);
+	iounmap (io_mem);
+	debug ("returned ebda segment: %x\n", ebda_seg);
+	
+	io_mem = ioremap (ebda_seg<<4, 65000);
+	if (!io_mem )
+		return -ENOMEM;
+	next_offset = 0x180;
+
+	for (;;) {
+		offset = next_offset;
+		next_offset = readw (io_mem + offset);	/* offset of next blk */
+
+		offset += 2;
+		if (next_offset == 0)	/* 0 indicate it's last blk */
+			break;
+		blk_id = readw (io_mem + offset);	/* this blk id */
+
+		offset += 2;
+		/* check if it is hot swap block or rio block */
+		if (blk_id != 0x4853 && blk_id != 0x4752)
+			continue;
+		/* found hs table */
+		if (blk_id == 0x4853) {
+			debug ("now enter hot swap block---\n");
+			debug ("hot blk id: %x\n", blk_id);
+			format = readb (io_mem + offset);
+
+			offset += 1;
+			if (format != 4) {
+				iounmap (io_mem);
+				return -ENODEV;
+			}
+			debug ("hot blk format: %x\n", format);
+			/* hot swap sub blk */
+			base = offset;
+
+			sub_addr = base;
+			re = readw (io_mem + sub_addr);	/* next sub blk */
+
+			sub_addr += 2;
+			rc_id = readw (io_mem + sub_addr); 	/* sub blk id */
+
+			sub_addr += 2;
+			if (rc_id != 0x5243) {
+				iounmap (io_mem);
+				return -ENODEV;
+			}
+			/* rc sub blk signature  */
+			num_ctlrs = readb (io_mem + sub_addr);
+
+			sub_addr += 1;
+			hpc_list_ptr = alloc_ebda_hpc_list ();
+			if (!hpc_list_ptr) {
+				iounmap (io_mem);
+				return -ENOMEM;
+			}
+			hpc_list_ptr->format = format;
+			hpc_list_ptr->num_ctlrs = num_ctlrs;
+			hpc_list_ptr->phys_addr = sub_addr;	/*  offset of RSRC_CONTROLLER blk */
+			debug ("info about hpc descriptor---\n");
+			debug ("hot blk format: %x\n", format);
+			debug ("num of controller: %x\n", num_ctlrs);
+			debug ("offset of hpc data structure enteries: %x\n ", sub_addr);
+
+			sub_addr = base + re;	/* re sub blk */
+			rc = readw (io_mem + sub_addr);	/* next sub blk */
+
+			sub_addr += 2;
+			re_id = readw (io_mem + sub_addr);	/* sub blk id */
+
+			sub_addr += 2;
+			if (re_id != 0x5245) {
+				iounmap (io_mem);
+				return -ENODEV;
+			}
+
+			/* signature of re */
+			num_entries = readw (io_mem + sub_addr);
+
+			sub_addr += 2;	/* offset of RSRC_ENTRIES blk */
+			rsrc_list_ptr = alloc_ebda_rsrc_list ();
+			if (!rsrc_list_ptr ) {
+				iounmap (io_mem);
+				return -ENOMEM;
+			}
+			rsrc_list_ptr->format = format;
+			rsrc_list_ptr->num_entries = num_entries;
+			rsrc_list_ptr->phys_addr = sub_addr;
+
+			debug ("info about rsrc descriptor---\n");
+			debug ("format: %x\n", format);
+			debug ("num of rsrc: %x\n", num_entries);
+			debug ("offset of rsrc data structure enteries: %x\n ", sub_addr);
+
+			hs_complete = 1;
+		}
+		/* found rio table */
+		else if (blk_id == 0x4752) {
+			debug ("now enter io table ---\n");
+			debug ("rio blk id: %x\n", blk_id);
+
+			rio_table_ptr = kmalloc (sizeof (struct rio_table_hdr), GFP_KERNEL);
+			if (!rio_table_ptr)
+				return -ENOMEM; 
+			memset (rio_table_ptr, 0, sizeof (struct rio_table_hdr) );
+			rio_table_ptr->ver_num = readb (io_mem + offset);
+			rio_table_ptr->scal_count = readb (io_mem + offset + 1);
+			rio_table_ptr->riodev_count = readb (io_mem + offset + 2);
+			rio_table_ptr->offset = offset +3 ;
+			
+			debug ("info about rio table hdr ---\n");
+			debug ("ver_num: %x\nscal_count: %x\nriodev_count: %x\noffset of rio table: %x\n ", rio_table_ptr->ver_num, rio_table_ptr->scal_count, rio_table_ptr->riodev_count, rio_table_ptr->offset);
+
+			rio_complete = 1;
+		}
+
+		if (hs_complete && rio_complete) {
+			rc = ebda_rsrc_controller ();
+			if (rc) {
+				iounmap(io_mem);
+				return rc;
+			}
+			rc = ebda_rsrc_rsrc ();
+			if (rc) {
+				iounmap(io_mem);
+				return rc;
+			}
+			rc = ebda_rio_table ();
+			if (rc) {
+				iounmap(io_mem);
+				return rc;
+			}	
+			iounmap (io_mem);
+			return 0;
+		}
+	}
+	iounmap (io_mem);
+	return -ENODEV;
+}
+
+
+/*
+ * map info (ctlr-id, slot count, slot#.. bus count, bus#, ctlr type...) of
+ * each hpc from physical address to a list of hot plug controllers based on
+ * hpc descriptors.
+ */
+static int ebda_rsrc_controller (void)
+{
+	u16 addr, addr_slot, addr_bus;
+	u8 ctlr_id, temp, bus_index;
+	u16 ctlr, slot, bus;
+	u16 slot_num, bus_num, index;
+	struct hotplug_slot *hp_slot_ptr;
+	struct controller *hpc_ptr;
+	struct ebda_hpc_bus *bus_ptr;
+	struct ebda_hpc_slot *slot_ptr;
+	struct bus_info *bus_info_ptr1, *bus_info_ptr2;
+	int rc;
+
+	addr = hpc_list_ptr->phys_addr;
+	for (ctlr = 0; ctlr < hpc_list_ptr->num_ctlrs; ctlr++) {
+		bus_index = 1;
+		ctlr_id = readb (io_mem + addr);
+		addr += 1;
+		slot_num = readb (io_mem + addr);
+
+		addr += 1;
+		addr_slot = addr;	/* offset of slot structure */
+		addr += (slot_num * 4);
+
+		bus_num = readb (io_mem + addr);
+
+		addr += 1;
+		addr_bus = addr;	/* offset of bus */
+		addr += (bus_num * 9);	/* offset of ctlr_type */
+		temp = readb (io_mem + addr);
+
+		addr += 1;
+		/* init hpc structure */
+		hpc_ptr = alloc_ebda_hpc (slot_num, bus_num);
+		if (!hpc_ptr ) {
+			iounmap (io_mem);
+			return -ENOMEM;
+		}
+		hpc_ptr->ctlr_id = ctlr_id;
+		hpc_ptr->ctlr_relative_id = ctlr;
+		hpc_ptr->slot_count = slot_num;
+		hpc_ptr->bus_count = bus_num;
+		debug ("now enter ctlr data struture ---\n");
+		debug ("ctlr id: %x\n", ctlr_id);
+		debug ("ctlr_relative_id: %x\n", hpc_ptr->ctlr_relative_id);
+		debug ("count of slots controlled by this ctlr: %x\n", slot_num);
+		debug ("count of buses controlled by this ctlr: %x\n", bus_num);
+
+		/* init slot structure, fetch slot, bus, cap... */
+		slot_ptr = hpc_ptr->slots;
+		for (slot = 0; slot < slot_num; slot++) {
+			slot_ptr->slot_num = readb (io_mem + addr_slot);
+			slot_ptr->slot_bus_num = readb (io_mem + addr_slot + slot_num);
+			slot_ptr->ctl_index = readb (io_mem + addr_slot + 2*slot_num);
+			slot_ptr->slot_cap = readb (io_mem + addr_slot + 3*slot_num);
+
+			// create bus_info lined list --- if only one slot per bus: slot_min = slot_max 
+
+			bus_info_ptr2 = ibmphp_find_same_bus_num (slot_ptr->slot_bus_num);
+			if (!bus_info_ptr2) {
+				bus_info_ptr1 = (struct bus_info *) kmalloc (sizeof (struct bus_info), GFP_KERNEL);
+				if (!bus_info_ptr1) {
+					iounmap (io_mem);
+					return -ENOMEM;
+				}
+				memset (bus_info_ptr1, 0, sizeof (struct bus_info));
+				bus_info_ptr1->slot_min = slot_ptr->slot_num;
+				bus_info_ptr1->slot_max = slot_ptr->slot_num;
+				bus_info_ptr1->slot_count += 1;
+				bus_info_ptr1->busno = slot_ptr->slot_bus_num;
+				bus_info_ptr1->index = bus_index++;
+				bus_info_ptr1->current_speed = 0xff;
+				bus_info_ptr1->current_bus_mode = 0xff;
+				if ( ((slot_ptr->slot_cap) & EBDA_SLOT_133_MAX) == EBDA_SLOT_133_MAX )
+					bus_info_ptr1->supported_speed =  3;
+				else if ( ((slot_ptr->slot_cap) & EBDA_SLOT_100_MAX) == EBDA_SLOT_100_MAX )
+					bus_info_ptr1->supported_speed =  2;
+				else if ( ((slot_ptr->slot_cap) & EBDA_SLOT_66_MAX) == EBDA_SLOT_66_MAX )
+					bus_info_ptr1->supported_speed =  1;
+				bus_info_ptr1->controller_id = hpc_ptr->ctlr_id;
+				if ( ((slot_ptr->slot_cap) & EBDA_SLOT_PCIX_CAP) == EBDA_SLOT_PCIX_CAP )
+					bus_info_ptr1->supported_bus_mode = 1;
+				else
+					bus_info_ptr1->supported_bus_mode =0;
+
+
+				list_add_tail (&bus_info_ptr1->bus_info_list, &bus_info_head);
+
+			} else {
+				bus_info_ptr2->slot_min = min (bus_info_ptr2->slot_min, slot_ptr->slot_num);
+				bus_info_ptr2->slot_max = max (bus_info_ptr2->slot_max, slot_ptr->slot_num);
+				bus_info_ptr2->slot_count += 1;
+
+			}
+
+			// end of creating the bus_info linked list
+
+			slot_ptr++;
+			addr_slot += 1;
+		}
+
+		/* init bus structure */
+		bus_ptr = hpc_ptr->buses;
+		for (bus = 0; bus < bus_num; bus++) {
+			bus_ptr->bus_num = readb (io_mem + addr_bus);
+			bus_ptr++;
+			addr_bus += 1;
+		}
+
+		hpc_ptr->ctlr_type = temp;
+
+		switch (hpc_ptr->ctlr_type) {
+			case 1:
+				hpc_ptr->u.pci_ctlr.bus = readb (io_mem + addr);
+				hpc_ptr->u.pci_ctlr.dev_fun = readb (io_mem + addr + 1);
+				hpc_ptr->irq = readb (io_mem + addr + 2);
+				addr += 3; 
+				break;
+
+			case 0:
+				hpc_ptr->u.isa_ctlr.io_start = readw (io_mem + addr);
+				hpc_ptr->u.isa_ctlr.io_end = readw (io_mem + addr + 2);
+				hpc_ptr->irq = readb (io_mem + addr + 4);
+				addr += 5;
+				break;
+
+			case 2:
+				hpc_ptr->u.wpeg_ctlr.wpegbbar = readl (io_mem + addr);
+				hpc_ptr->u.wpeg_ctlr.i2c_addr = readb (io_mem + addr + 4);
+				/* following 2 lines for testing purpose */
+				if (hpc_ptr->u.wpeg_ctlr.i2c_addr == 0) 
+					hpc_ptr->ctlr_type = 4;	
+				
+
+				hpc_ptr->irq = readb (io_mem + addr + 5);
+				addr += 6;
+				break;
+			case 4:
+				hpc_ptr->u.wpeg_ctlr.wpegbbar = readl (io_mem + addr);
+				hpc_ptr->u.wpeg_ctlr.i2c_addr = readb (io_mem + addr + 4);
+				hpc_ptr->irq = readb (io_mem + addr + 5);
+				addr += 6;
+				break;
+			default:
+				iounmap (io_mem);
+				return -ENODEV;
+		}
+		/* following 3 line: Now our driver only supports I2c ctlrType */
+		if ((hpc_ptr->ctlr_type != 2) && (hpc_ptr->ctlr_type != 4)) {
+			err ("Please run this driver on ibm xseries440\n ");
+			return -ENODEV;
+		}
+
+		hpc_ptr->revision = 0xff;
+		hpc_ptr->options = 0xff;
+
+		// register slots with hpc core as well as create linked list of ibm slot
+		for (index = 0; index < hpc_ptr->slot_count; index++) {
+
+			hp_slot_ptr = (struct hotplug_slot *) kmalloc (sizeof (struct hotplug_slot), GFP_KERNEL);
+			if (!hp_slot_ptr) {
+				iounmap (io_mem);
+				return -ENOMEM;
+			}
+			memset (hp_slot_ptr, 0, sizeof (struct hotplug_slot));
+
+			hp_slot_ptr->info = (struct hotplug_slot_info *) kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL);
+			if (!hp_slot_ptr->info) {
+				iounmap (io_mem);
+				kfree (hp_slot_ptr);
+				return -ENOMEM;
+			}
+			memset (hp_slot_ptr->info, 0, sizeof (struct hotplug_slot_info));
+
+			hp_slot_ptr->name = (char *) kmalloc (10, GFP_KERNEL);
+			if (!hp_slot_ptr->name) {
+				iounmap (io_mem);
+				kfree (hp_slot_ptr->info);
+				kfree (hp_slot_ptr);
+				return -ENOMEM;
+			}
+
+			hp_slot_ptr->private = alloc_ibm_slot ();
+			if (!hp_slot_ptr->private) {
+				iounmap (io_mem);
+				kfree (hp_slot_ptr->name);
+				kfree (hp_slot_ptr->info);
+				kfree (hp_slot_ptr);
+				return -ENOMEM;
+			}
+
+			((struct slot *)hp_slot_ptr->private)->flag = TRUE;
+			snprintf (hp_slot_ptr->name, 10, "%d", hpc_ptr->slots[index].slot_num);
+
+			((struct slot *) hp_slot_ptr->private)->capabilities = hpc_ptr->slots[index].slot_cap;
+			((struct slot *) hp_slot_ptr->private)->bus = hpc_ptr->slots[index].slot_bus_num;
+
+			bus_info_ptr1 = ibmphp_find_same_bus_num (hpc_ptr->slots[index].slot_bus_num);
+			if (!bus_info_ptr1) {
+				iounmap (io_mem);
+				return -ENODEV;
+			}
+			((struct slot *) hp_slot_ptr->private)->bus_on = bus_info_ptr1;
+			bus_info_ptr1 = NULL;
+			((struct slot *) hp_slot_ptr->private)->ctrl = hpc_ptr;
+
+
+			((struct slot *) hp_slot_ptr->private)->ctlr_index = hpc_ptr->slots[index].ctl_index;
+			((struct slot *) hp_slot_ptr->private)->number = hpc_ptr->slots[index].slot_num;
+
+			((struct slot *) hp_slot_ptr->private)->hotplug_slot = hp_slot_ptr;
+
+			rc = ibmphp_hpc_fillhpslotinfo (hp_slot_ptr);
+			if (rc) {
+				iounmap (io_mem);
+				return rc;
+			}
+
+			rc = ibmphp_init_devno ((struct slot **) &hp_slot_ptr->private);
+			if (rc) {
+				iounmap (io_mem);
+				return rc;
+			}
+			hp_slot_ptr->ops = &ibmphp_hotplug_slot_ops;
+
+			pci_hp_register (hp_slot_ptr);
+
+			// end of registering ibm slot with hotplug core
+
+			list_add (& ((struct slot *)(hp_slot_ptr->private))->ibm_slot_list, &ibmphp_slot_head);
+		}
+
+		print_bus_info ();
+		list_add (&hpc_ptr->ebda_hpc_list, &ebda_hpc_head );
+
+	}			/* each hpc  */
+	print_ebda_hpc ();
+	return 0;
+}
+
+/* 
+ * map info (bus, devfun, start addr, end addr..) of i/o, memory,
+ * pfm from the physical addr to a list of resource.
+ */
+static int ebda_rsrc_rsrc (void)
+{
+	u16 addr;
+	short rsrc;
+	u8 type, rsrc_type;
+	struct ebda_pci_rsrc *rsrc_ptr;
+
+	addr = rsrc_list_ptr->phys_addr;
+	debug ("now entering rsrc land\n");
+	debug ("offset of rsrc: %x\n", rsrc_list_ptr->phys_addr);
+
+	for (rsrc = 0; rsrc < rsrc_list_ptr->num_entries; rsrc++) {
+		type = readb (io_mem + addr);
+
+		addr += 1;
+		rsrc_type = type & EBDA_RSRC_TYPE_MASK;
+
+		if (rsrc_type == EBDA_IO_RSRC_TYPE) {
+			rsrc_ptr = alloc_ebda_pci_rsrc ();
+			if (!rsrc_ptr) {
+				iounmap (io_mem);
+				return -ENOMEM;
+			}
+			rsrc_ptr->rsrc_type = type;
+
+			rsrc_ptr->bus_num = readb (io_mem + addr);
+			rsrc_ptr->dev_fun = readb (io_mem + addr + 1);
+			rsrc_ptr->start_addr = readw (io_mem + addr + 2);
+			rsrc_ptr->end_addr = readw (io_mem + addr + 4);
+			addr += 6;
+
+			debug ("rsrc from io type ----\n");
+			debug ("rsrc type: %x bus#: %x dev_func: %x start addr: %lx end addr: %lx\n",
+				rsrc_ptr->rsrc_type, rsrc_ptr->bus_num, rsrc_ptr->dev_fun, rsrc_ptr->start_addr, rsrc_ptr->end_addr);
+
+			list_add (&rsrc_ptr->ebda_pci_rsrc_list, &ibmphp_ebda_pci_rsrc_head);
+		}
+
+		if (rsrc_type == EBDA_MEM_RSRC_TYPE || rsrc_type == EBDA_PFM_RSRC_TYPE) {
+			rsrc_ptr = alloc_ebda_pci_rsrc ();
+			if (!rsrc_ptr ) {
+				iounmap (io_mem);
+				return -ENOMEM;
+			}
+			rsrc_ptr->rsrc_type = type;
+
+			rsrc_ptr->bus_num = readb (io_mem + addr);
+			rsrc_ptr->dev_fun = readb (io_mem + addr + 1);
+			rsrc_ptr->start_addr = readl (io_mem + addr + 2);
+			rsrc_ptr->end_addr = readl (io_mem + addr + 6);
+			addr += 10;
+
+			debug ("rsrc from mem or pfm ---\n");
+			debug ("rsrc type: %x bus#: %x dev_func: %x start addr: %lx end addr: %lx\n", 
+				rsrc_ptr->rsrc_type, rsrc_ptr->bus_num, rsrc_ptr->dev_fun, rsrc_ptr->start_addr, rsrc_ptr->end_addr);
+
+			list_add (&rsrc_ptr->ebda_pci_rsrc_list, &ibmphp_ebda_pci_rsrc_head);
+		}
+	}
+	kfree (rsrc_list_ptr);
+	rsrc_list_ptr = NULL;
+	print_ebda_pci_rsrc ();
+	return 0;
+}
+
+/*
+ * map info of scalability details and rio details from physical address
+ */
+static int ebda_rio_table(void)
+{
+	u16 offset;
+	u8 i;
+	struct scal_detail *scal_detail_ptr;
+	struct rio_detail *rio_detail_ptr;
+
+	offset = rio_table_ptr->offset;
+	for (i = 0; i < rio_table_ptr->scal_count; i++) {
+		
+		scal_detail_ptr = kmalloc (sizeof (struct scal_detail), GFP_KERNEL );
+		if (!scal_detail_ptr )
+			return -ENOMEM;
+		memset (scal_detail_ptr, 0, sizeof (struct scal_detail) );
+		scal_detail_ptr->node_id = readb (io_mem + offset);
+		scal_detail_ptr->cbar = readl (io_mem+ offset + 1);
+		scal_detail_ptr->port0_node_connect = readb (io_mem + 5);
+		scal_detail_ptr->port0_port_connect = readb (io_mem + 6);
+		scal_detail_ptr->port1_node_connect = readb (io_mem + 7);
+		scal_detail_ptr->port1_port_connect = readb (io_mem + 8);
+		scal_detail_ptr->port2_node_connect = readb (io_mem + 9);
+		scal_detail_ptr->port2_port_connect = readb (io_mem + 10);
+		debug ("node_id: %x\ncbar: %x\nport0_node: %x\nport0_port: %x\nport1_node: %x\nport1_port: %x\nport2_node: %x\nport2_port: %x\n", scal_detail_ptr->node_id, scal_detail_ptr->cbar, scal_detail_ptr->port0_node_connect, scal_detail_ptr->port0_port_connect, scal_detail_ptr->port1_node_connect, scal_detail_ptr->port1_port_connect, scal_detail_ptr->port2_node_connect, scal_detail_ptr->port2_port_connect);
+//		list_add (&scal_detail_ptr->scal_detail_list, &scal_detail_head);
+		offset += 11;
+	}
+	for (i=0; i < rio_table_ptr->riodev_count; i++) {
+		rio_detail_ptr = kmalloc (sizeof (struct rio_detail), GFP_KERNEL );
+		if (!rio_detail_ptr )
+			return -ENOMEM;
+		memset (rio_detail_ptr, 0, sizeof (struct rio_detail) );
+		rio_detail_ptr->rio_node_id = readb (io_mem + offset );
+		rio_detail_ptr->bbar = readl (io_mem + offset + 1);
+		rio_detail_ptr->rio_type = readb (io_mem + offset + 5);
+		rio_detail_ptr->owner_id = readb (io_mem + offset + 6);
+		rio_detail_ptr->port0_node_connect = readb (io_mem + offset + 7);
+		rio_detail_ptr->port0_port_connect = readb (io_mem + offset + 8);
+		rio_detail_ptr->port1_node_connect = readb (io_mem + offset + 9);
+		rio_detail_ptr->port1_port_connect = readb (io_mem + offset + 10);
+		rio_detail_ptr->first_slot_num = readb (io_mem + offset + 11);
+		rio_detail_ptr->status = readb (io_mem + offset + 12);
+		debug ("rio_node_id: %x\nbbar: %x\nrio_type: %x\nowner_id: %x\nport0_node: %x\nport0_port: %x\nport1_node: %x\nport1_port: %x\nfirst_slot_num: %x\nstatus: %x\n", rio_detail_ptr->rio_node_id, rio_detail_ptr->bbar, rio_detail_ptr->rio_type, rio_detail_ptr->owner_id, rio_detail_ptr->port0_node_connect, rio_detail_ptr->port0_port_connect, rio_detail_ptr->port1_node_connect, rio_detail_ptr->port1_port_connect, rio_detail_ptr->first_slot_num, rio_detail_ptr->status);
+		offset += 13;
+	}
+	return 0;
+}
+
+u16 ibmphp_get_total_controllers (void)
+{
+	return hpc_list_ptr->num_ctlrs;
+}
+
+struct slot *ibmphp_get_slot_from_physical_num (u8 physical_num)
+{
+	struct slot *slot;
+	struct list_head *list;
+
+	list_for_each (list, &ibmphp_slot_head) {
+		slot = list_entry (list, struct slot, ibm_slot_list);
+		if (slot->number == physical_num)
+			return slot;
+	}
+	return NULL;
+}
+
+/* To find:
+ *	- the smallest slot number
+ *	- the largest slot number
+ *	- the total number of the slots based on each bus
+ *	  (if only one slot per bus slot_min = slot_max )
+ */
+struct bus_info *ibmphp_find_same_bus_num (u32 num)
+{
+	struct bus_info *ptr;
+	struct list_head  *ptr1;
+
+	list_for_each (ptr1, &bus_info_head) {
+		ptr = list_entry (ptr1, struct bus_info, bus_info_list); 
+		if (ptr->busno == num) 
+			 return ptr;
+	}
+	return NULL;
+}
+
+/*  Finding relative bus number, in order to map corresponding
+ *  bus register
+ */
+int ibmphp_get_bus_index (u8 num)
+{
+	struct bus_info *ptr;
+	struct list_head  *ptr1;
+
+	list_for_each (ptr1, &bus_info_head) {
+		ptr = list_entry (ptr1, struct bus_info, bus_info_list);
+		if (ptr->busno == num)  
+			return ptr->index;
+	}
+	return -ENODEV;
+}
+
+void ibmphp_free_bus_info_queue (void)
+{
+	struct bus_info *bus_info;
+	struct list_head *list;
+	struct list_head *next;
+
+	list_for_each_safe (list, next, &bus_info_head ) {
+		bus_info = list_entry (list, struct bus_info, bus_info_list);
+		kfree (bus_info);
+	}
+}
+
+/*
+ * Calculate the total hot pluggable slots controlled by total hpcs
+ */
+/*
+int ibmphp_get_total_hp_slots (void)
+{
+	struct ebda_hpc *ptr;
+	int slot_num = 0;
+
+	ptr = ebda_hpc_head;
+	while (ptr != NULL) {
+		slot_num += ptr->slot_count;
+		ptr = ptr->next;
+	}
+	return slot_num;
+}
+*/
+
+void ibmphp_free_ebda_hpc_queue (void)
+{
+	struct controller *controller;
+	struct list_head *list;
+	struct list_head *next;
+
+	list_for_each_safe (list, next, &ebda_hpc_head) {
+		controller = list_entry (list, struct controller, ebda_hpc_list);
+		free_ebda_hpc (controller);
+	}
+}
+
+void ibmphp_free_ebda_pci_rsrc_queue (void)
+{
+	struct ebda_pci_rsrc *resource;
+	struct list_head *list;
+	struct list_head *next;
+
+	list_for_each_safe (list, next, &ibmphp_ebda_pci_rsrc_head) {
+		resource = list_entry (list, struct ebda_pci_rsrc, ebda_pci_rsrc_list);
+		kfree (resource);
+		resource = NULL;
+	}
+}
+

drivers/hotplug/ibmphp_hpc.c

+/*
+ * IBM Hot Plug Controller Driver
+ *
+ * Written By: Jyoti Shah, IBM Corporation
+ *
+ * Copyright (c) 2001,2001 IBM Corp.
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <gregkh@us.ibm.com>
+ *                  <jshah@us.ibm.com>
+ *
+ */
+
+//#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/time.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/smp_lock.h>
+#include "ibmphp.h"
+
+#define POLL_NO		0x01
+#define POLL_YES	0x00
+
+static int to_debug = FALSE;
+#define debug_polling(fmt, arg...)	do { if (to_debug) debug (fmt, arg); } while (0)
+
+//----------------------------------------------------------------------------
+// timeout values
+//----------------------------------------------------------------------------
+#define CMD_COMPLETE_TOUT_SEC	60	// give HPC 60 sec to finish cmd
+#define HPC_CTLR_WORKING_TOUT	60	// give HPC 60 sec to finish cmd
+#define HPC_GETACCESS_TIMEOUT	60	// seconds
+#define POLL_INTERVAL_SEC	2	// poll HPC every 2 seconds
+#define POLL_LATCH_CNT		5	// poll latch 5 times, then poll slots
+
+//----------------------------------------------------------------------------
+// Winnipeg Architected Register Offsets
+//----------------------------------------------------------------------------
+#define WPG_I2CMBUFL_OFFSET	0x08	// I2C Message Buffer Low
+#define WPG_I2CMOSUP_OFFSET	0x10	// I2C Master Operation Setup Reg
+#define WPG_I2CMCNTL_OFFSET	0x20	// I2C Master Control Register
+#define WPG_I2CPARM_OFFSET	0x40	// I2C Parameter Register
+#define WPG_I2CSTAT_OFFSET	0x70	// I2C Status Register
+
+//----------------------------------------------------------------------------
+// Winnipeg Store Type commands (Add this commands to the register offset)
+//----------------------------------------------------------------------------
+#define WPG_I2C_AND		0x1000	// I2C AND operation
+#define WPG_I2C_OR		0x2000	// I2C OR operation
+
+//----------------------------------------------------------------------------
+// Command set for I2C Master Operation Setup Regisetr
+//----------------------------------------------------------------------------
+#define WPG_READATADDR_MASK	0x00010000	// read,bytes,I2C shifted,index
+#define WPG_WRITEATADDR_MASK	0x40010000	// write,bytes,I2C shifted,index
+#define WPG_READDIRECT_MASK	0x10010000
+#define WPG_WRITEDIRECT_MASK	0x60010000
+
+
+//----------------------------------------------------------------------------
+// bit masks for I2C Master Control Register
+//----------------------------------------------------------------------------
+#define WPG_I2CMCNTL_STARTOP_MASK	0x00000002	// Start the Operation
+
+//----------------------------------------------------------------------------
+//
+//----------------------------------------------------------------------------
+#define WPG_I2C_IOREMAP_SIZE	0x2044	// size of linear address interval
+#define WPG_CTLR_MAX		0x01	// max controllers
+#define WPG_SLOT_MAX		0x06	// max slots
+#define WPG_CTLR_SLOT_MAX	0x06	// max slots per controller
+#define WPG_FIRST_CTLR		0x00	// index of the controller
+
+//----------------------------------------------------------------------------
+// command index
+//----------------------------------------------------------------------------
+#define WPG_1ST_SLOT_INDEX	0x01	// index - 1st slot for ctlr
+#define WPG_CTLR_INDEX		0x0F	// index - ctlr
+#define WPG_1ST_EXTSLOT_INDEX	0x10	// index - 1st ext slot for ctlr
+#define WPG_1ST_BUS_INDEX	0x1F	// index - 1st bus for ctlr
+
+//----------------------------------------------------------------------------
+// macro utilities
+//----------------------------------------------------------------------------
+// if bits 20,22,25,26,27,29,30 are OFF return TRUE
+#define HPC_I2CSTATUS_CHECK(s)	((u8)((s & 0x00000A76) ? FALSE : TRUE))
+
+// return code 0:poll slots, 1-POLL_LATCH_CNT:poll latch register
+#define INCREMENT_POLLCNT(i)	((i < POLL_LATCH_CNT) ? i++ : (i=0))
+//----------------------------------------------------------------------------
+// global variables
+//----------------------------------------------------------------------------
+static int ibmphp_shutdown;
+static int tid_poll;
+static int stop_polling;		// 2 values: poll, don't poll
+static struct semaphore sem_hpcaccess;	// lock access to HPC
+static struct semaphore semOperations;	// lock all operations and
+					// access to data structures
+static struct semaphore sem_exit;	// make sure polling thread goes away
+static struct semaphore sem_poll;	// make sure poll is idle 
+//----------------------------------------------------------------------------
+// local function prototypes
+//----------------------------------------------------------------------------
+static u8 ctrl_read (struct controller *, void *, u8);
+static u8 ctrl_write (struct controller *, void *, u8, u8);
+static u8 hpc_writecmdtoindex (u8, u8);
+static u8 hpc_readcmdtoindex (u8, u8);
+static void get_hpc_access (void);
+static void free_hpc_access (void);
+static void poll_hpc (void);
+static int update_slot (struct slot *, u8);
+static int process_changeinstatus (struct slot *, struct slot *);
+static int process_changeinlatch (u8, u8);
+static int hpc_poll_thread (void *);
+static int hpc_wait_ctlr_notworking (int, struct controller *, void *, u8 *);
+//----------------------------------------------------------------------------
+
+
+/*----------------------------------------------------------------------
+* Name:    ibmphp_hpc_initvars
+*
+* Action:  initialize semaphores and variables
+*---------------------------------------------------------------------*/
+void ibmphp_hpc_initvars (void)
+{
+	debug ("%s - Entry\n", __FUNCTION__);
+
+	init_MUTEX (&sem_hpcaccess);
+	init_MUTEX (&semOperations);
+	init_MUTEX_LOCKED (&sem_exit);
+	init_MUTEX_LOCKED (&sem_poll);
+	stop_polling = POLL_YES;
+	to_debug = FALSE;
+	ibmphp_shutdown = FALSE;
+	tid_poll = 0;
+
+	debug ("%s - Exit\n", __FUNCTION__);
+}
+
+/*----------------------------------------------------------------------
+* Name:    ctrl_read
+*
+* Action:  read from HPC over I2C
+*
+*---------------------------------------------------------------------*/
+static u8 ctrl_read (struct controller *ctlr_ptr, void *WPGBbar, u8 index)
+{
+	u8 status;
+	int i;
+	void *wpg_addr;		// base addr + offset
+	ulong wpg_data,		// data to/from WPG LOHI format
+	ultemp, data;		// actual data HILO format
+
+
+	debug_polling ("%s - Entry WPGBbar[%lx] index[%x] \n", __FUNCTION__, (ulong) WPGBbar, index);
+
+	//--------------------------------------------------------------------
+	// READ - step 1
+	// read at address, byte length, I2C address (shifted), index
+	// or read direct, byte length, index
+	if (ctlr_ptr->ctlr_type == 0x02) {
+		data = WPG_READATADDR_MASK;
+		// fill in I2C address
+		ultemp = (ulong) ctlr_ptr->u.wpeg_ctlr.i2c_addr;
+		ultemp = ultemp >> 1;
+		data |= (ultemp << 8);
+
+		// fill in index
+		data |= (ulong) index;
+	} else if (ctlr_ptr->ctlr_type == 0x04) {
+		data = WPG_READDIRECT_MASK;
+
+		// fill in index
+		ultemp = (ulong) index;
+		ultemp = ultemp << 8;
+		data |= ultemp;
+	} else {
+		err ("this controller type is not supported \n");
+		return HPC_ERROR;
+	}
+
+	wpg_data = swab32 (data);	// swap data before writing
+	(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CMOSUP_OFFSET;
+	writel (wpg_data, wpg_addr);
+
+	//--------------------------------------------------------------------
+	// READ - step 2 : clear the message buffer
+	data = 0x00000000;
+	wpg_data = swab32 (data);
+	(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CMBUFL_OFFSET;
+	writel (wpg_data, wpg_addr);
+
+	//--------------------------------------------------------------------
+	// READ - step 3 : issue start operation, I2C master control bit 30:ON
+	//                 2020 : [20] OR operation at [20] offset 0x20
+	data = WPG_I2CMCNTL_STARTOP_MASK;
+	wpg_data = swab32 (data);
+	(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CMCNTL_OFFSET + (ulong) WPG_I2C_OR;
+	writel (wpg_data, wpg_addr);
+
+	//--------------------------------------------------------------------
+	// READ - step 4 : wait until start operation bit clears
+	i = CMD_COMPLETE_TOUT_SEC;
+	while (i) {
+		long_delay (1 * HZ / 100);
+		(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CMCNTL_OFFSET;
+		wpg_data = readl (wpg_addr);
+		data = swab32 (wpg_data);
+		if (!(data & WPG_I2CMCNTL_STARTOP_MASK))
+			break;
+		i--;
+	}
+	if (i == 0) {
+		debug ("%s - Error : WPG timeout\n", __FUNCTION__);
+		return HPC_ERROR;
+	}
+	//--------------------------------------------------------------------
+	// READ - step 5 : read I2C status register
+	i = CMD_COMPLETE_TOUT_SEC;
+	while (i) {
+		long_delay (1 * HZ / 100);
+		(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CSTAT_OFFSET;
+		wpg_data = readl (wpg_addr);
+		data = swab32 (wpg_data);
+		if (HPC_I2CSTATUS_CHECK (data))
+			break;
+		i--;
+	}
+	if (i == 0) {
+		debug ("ctrl_read - Exit Error:I2C timeout\n");
+		return HPC_ERROR;
+	}
+
+	//--------------------------------------------------------------------
+	// READ - step 6 : get DATA
+	(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CMBUFL_OFFSET;
+	wpg_data = readl (wpg_addr);
+	data = swab32 (wpg_data);
+
+	status = (u8) data;
+
+	debug_polling ("%s - Exit index[%x] status[%x]\n", __FUNCTION__, index, status);
+
+	return (status);
+}
+
+/*----------------------------------------------------------------------
+* Name:    ctrl_write
+*
+* Action:  write to HPC over I2C
+*
+* Return   0 or error codes
+*---------------------------------------------------------------------*/
+static u8 ctrl_write (struct controller *ctlr_ptr, void *WPGBbar, u8 index, u8 cmd)
+{
+	u8 rc;
+	void *wpg_addr;		// base addr + offset
+	ulong wpg_data,		// data to/from WPG LOHI format 
+	ultemp, data;		// actual data HILO format
+	int i;
+
+
+	debug_polling ("%s - Entry WPGBbar[%lx] index[%x] cmd[%x]\n",
+		       __FUNCTION__, (ulong) WPGBbar, index, cmd);
+
+	rc = 0;
+	//--------------------------------------------------------------------
+	// WRITE - step 1
+	// write at address, byte length, I2C address (shifted), index
+	// or write direct, byte length, index
+	data = 0x00000000;
+
+	if (ctlr_ptr->ctlr_type == 0x02) {
+		data = WPG_WRITEATADDR_MASK;
+		// fill in I2C address
+		ultemp = (ulong) ctlr_ptr->u.wpeg_ctlr.i2c_addr;
+		ultemp = ultemp >> 1;
+		data |= (ultemp << 8);
+
+		// fill in index
+		data |= (ulong) index;
+	} else if (ctlr_ptr->ctlr_type == 0x04) {
+		data = WPG_WRITEDIRECT_MASK;
+
+		// fill in index
+		ultemp = (ulong) index;
+		ultemp = ultemp << 8;
+		data |= ultemp;
+	} else {
+		err ("this controller type is not supported \n");
+		return HPC_ERROR;
+	}
+
+	wpg_data = swab32 (data);	// swap data before writing
+	(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CMOSUP_OFFSET;
+	writel (wpg_data, wpg_addr);
+
+	//--------------------------------------------------------------------
+	// WRITE - step 2 : clear the message buffer
+	data = 0x00000000 | (ulong) cmd;
+	wpg_data = swab32 (data);
+	(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CMBUFL_OFFSET;
+	writel (wpg_data, wpg_addr);
+
+	//--------------------------------------------------------------------
+	// WRITE - step 3 : issue start operation,I2C master control bit 30:ON
+	//                 2020 : [20] OR operation at [20] offset 0x20
+	data = WPG_I2CMCNTL_STARTOP_MASK;
+	wpg_data = swab32 (data);
+	(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CMCNTL_OFFSET + (ulong) WPG_I2C_OR;
+	writel (wpg_data, wpg_addr);
+
+	//--------------------------------------------------------------------
+	// WRITE - step 4 : wait until start operation bit clears
+	i = CMD_COMPLETE_TOUT_SEC;
+	while (i) {
+		long_delay (1 * HZ / 100);
+		(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CMCNTL_OFFSET;
+		wpg_data = readl (wpg_addr);
+		data = swab32 (wpg_data);
+		if (!(data & WPG_I2CMCNTL_STARTOP_MASK))
+			break;
+		i--;
+	}
+	if (i == 0) {
+		debug ("%s - Exit Error:WPG timeout\n", __FUNCTION__);
+		rc = HPC_ERROR;
+	}
+
+	//--------------------------------------------------------------------
+	// WRITE - step 5 : read I2C status register
+	i = CMD_COMPLETE_TOUT_SEC;
+	while (i) {
+		long_delay (1 * HZ / 100);
+		(ulong) wpg_addr = (ulong) WPGBbar + (ulong) WPG_I2CSTAT_OFFSET;
+		wpg_data = readl (wpg_addr);
+		data = swab32 (wpg_data);
+		if (HPC_I2CSTATUS_CHECK (data))
+			break;
+		i--;
+	}
+	if (i == 0) {
+		debug ("ctrl_read - Error : I2C timeout\n");
+		rc = HPC_ERROR;
+	}
+
+	debug_polling ("%s Exit rc[%x]\n", __FUNCTION__, rc);
+	return (rc);
+}
+
+/*----------------------------------------------------------------------
+* Name:    hpc_writecmdtoindex()
+*
+* Action:  convert a write command to proper index within a controller
+*
+* Return   index, HPC_ERROR
+*---------------------------------------------------------------------*/
+static u8 hpc_writecmdtoindex (u8 cmd, u8 index)
+{
+	u8 rc;
+
+	switch (cmd) {
+	case HPC_CTLR_ENABLEIRQ:	// 0x00.N.15
+	case HPC_CTLR_CLEARIRQ:	// 0x06.N.15
+	case HPC_CTLR_RESET:	// 0x07.N.15
+	case HPC_CTLR_IRQSTEER:	// 0x08.N.15
+	case HPC_CTLR_DISABLEIRQ:	// 0x01.N.15
+	case HPC_ALLSLOT_ON:	// 0x11.N.15
+	case HPC_ALLSLOT_OFF:	// 0x12.N.15
+		rc = 0x0F;
+		break;
+
+	case HPC_SLOT_OFF:	// 0x02.Y.0-14
+	case HPC_SLOT_ON:	// 0x03.Y.0-14
+	case HPC_SLOT_ATTNOFF:	// 0x04.N.0-14
+	case HPC_SLOT_ATTNON:	// 0x05.N.0-14
+	case HPC_SLOT_BLINKLED:	// 0x13.N.0-14
+		rc = index;
+		break;
+
+	case HPC_BUS_33CONVMODE:
+	case HPC_BUS_66CONVMODE:
+	case HPC_BUS_66PCIXMODE:
+	case HPC_BUS_100PCIXMODE:
+	case HPC_BUS_133PCIXMODE:
+		rc = index + WPG_1ST_BUS_INDEX - 1;
+		break;
+
+	default:
+		err ("hpc_writecmdtoindex - Error invalid cmd[%x]\n", cmd);
+		rc = HPC_ERROR;
+	}
+
+	return rc;
+}
+
+/*----------------------------------------------------------------------
+* Name:    hpc_readcmdtoindex()
+*
+* Action:  convert a read command to proper index within a controller
+*
+* Return   index, HPC_ERROR
+*---------------------------------------------------------------------*/
+static u8 hpc_readcmdtoindex (u8 cmd, u8 index)
+{
+	u8 rc;
+
+	switch (cmd) {
+	case READ_CTLRSTATUS:
+		rc = 0x0F;
+		break;
+	case READ_SLOTSTATUS:
+	case READ_ALLSTAT:
+		rc = index;
+		break;
+	case READ_EXTSLOTSTATUS:
+		rc = index + WPG_1ST_EXTSLOT_INDEX;
+		break;
+	case READ_BUSSTATUS:
+		rc = index + WPG_1ST_BUS_INDEX - 1;
+		break;
+	case READ_SLOTLATCHLOWREG:
+		rc = 0x28;
+		break;
+	case READ_REVLEVEL:
+		rc = 0x25;
+		break;
+	case READ_HPCOPTIONS:
+		rc = 0x27;
+		break;
+	default:
+		rc = HPC_ERROR;
+	}
+	return rc;
+}
+
+/*----------------------------------------------------------------------
+* Name:    HPCreadslot()
+*
+* Action:  issue a READ command to HPC
+*
+* Input:   pslot   - can not be NULL for READ_ALLSTAT
+*          pstatus - can be NULL for READ_ALLSTAT
+*
+* Return   0 or error codes
+*---------------------------------------------------------------------*/
+int ibmphp_hpc_readslot (struct slot * pslot, u8 cmd, u8 * pstatus)
+{
+	void *wpg_bbar;
+	struct controller *ctlr_ptr;
+	struct list_head *pslotlist;
+	u8 index, status;
+	int rc = 0;
+	int busindex;
+
+	debug_polling ("%s - Entry pslot[%lx] cmd[%x] pstatus[%lx]\n",
+		       __FUNCTION__, (ulong) pslot, cmd, (ulong) pstatus);
+
+	if ((pslot == NULL)
+	    || ((pstatus == NULL) && (cmd != READ_ALLSTAT) && (cmd != READ_BUSSTATUS))) {
+		rc = -EINVAL;
+		err ("%s - Error invalid pointer, rc[%d]\n", __FUNCTION__, rc);
+		return rc;
+	}
+
+	if (cmd == READ_BUSSTATUS) {
+		busindex = ibmphp_get_bus_index (pslot->bus);
+		if (busindex < 0) {
+			rc = -EINVAL;
+			err ("%s - Exit Error:invalid bus, rc[%d]\n", __FUNCTION__, rc);
+			return rc;
+		} else
+			index = (u8) busindex;
+	} else
+		index = pslot->ctlr_index;
+
+	index = hpc_readcmdtoindex (cmd, index);
+
+	if (index == HPC_ERROR) {
+		rc = -EINVAL;
+		err ("%s - Exit Error:invalid index, rc[%d]\n", __FUNCTION__, rc);
+		return rc;
+	}
+
+	ctlr_ptr = pslot->ctrl;
+
+	get_hpc_access ();
+
+	//--------------------------------------------------------------------
+	// map physical address to logical address
+	//--------------------------------------------------------------------
+	wpg_bbar = ioremap (ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE);
+
+	//--------------------------------------------------------------------
+	// check controller status before reading
+	//--------------------------------------------------------------------
+	rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status);
+	if (!rc) {
+		switch (cmd) {
+		case READ_ALLSTAT:
+			// update the slot structure
+			pslot->ctrl->status = status;
+			pslot->status = ctrl_read (ctlr_ptr, wpg_bbar, index);
+			rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar,
+						       &status);
+			if (!rc)
+				pslot->ext_status = ctrl_read (ctlr_ptr, wpg_bbar, index + WPG_1ST_EXTSLOT_INDEX);
+
+			break;
+
+		case READ_SLOTSTATUS:
+			// DO NOT update the slot structure
+			*pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
+			break;
+
+		case READ_EXTSLOTSTATUS:
+			// DO NOT update the slot structure
+			*pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
+			break;
+
+		case READ_CTLRSTATUS:
+			// DO NOT update the slot structure
+			*pstatus = status;
+			break;
+
+		case READ_BUSSTATUS:
+			pslot->busstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
+			break;
+		case READ_REVLEVEL:
+			*pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
+			break;
+		case READ_HPCOPTIONS:
+			*pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
+			break;
+		case READ_SLOTLATCHLOWREG:
+			// DO NOT update the slot structure
+			*pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
+			break;
+
+			// Not used
+		case READ_ALLSLOT:
+			list_for_each (pslotlist, &ibmphp_slot_head) {
+				pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
+				index = pslot->ctlr_index;
+				rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr,
+								wpg_bbar, &status);
+				if (!rc) {
+					pslot->status = ctrl_read (ctlr_ptr, wpg_bbar, index);
+					rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT,
+									ctlr_ptr, wpg_bbar, &status);
+					if (!rc)
+						pslot->ext_status =
+						    ctrl_read (ctlr_ptr, wpg_bbar,
+								index + WPG_1ST_EXTSLOT_INDEX);
+				} else {
+					err ("%s - Error ctrl_read failed\n", __FUNCTION__);
+					rc = -EINVAL;
+					break;
+				}
+			}
+			break;
+		default:
+			rc = -EINVAL;
+			break;
+		}
+	}
+	//--------------------------------------------------------------------
+	// cleanup
+	//--------------------------------------------------------------------
+	iounmap (wpg_bbar);	// remove physical to logical address mapping
+	free_hpc_access ();
+
+	debug_polling ("%s - Exit rc[%d]\n", __FUNCTION__, rc);
+	return rc;
+}
+
+/*----------------------------------------------------------------------
+* Name:    ibmphp_hpc_writeslot()
+*
+* Action: issue a WRITE command to HPC
+*---------------------------------------------------------------------*/
+int ibmphp_hpc_writeslot (struct slot * pslot, u8 cmd)
+{
+	void *wpg_bbar;
+	struct controller *ctlr_ptr;
+	u8 index, status;
+	int busindex;
+	u8 done;
+	int rc = 0;
+	int timeout;
+
+	debug_polling ("%s - Entry pslot[%lx] cmd[%x]\n", __FUNCTION__, (ulong) pslot, cmd);
+	if (pslot == NULL) {
+		rc = -EINVAL;
+		err ("%s - Error Exit rc[%d]\n", __FUNCTION__, rc);
+		return rc;
+	}
+
+	if ((cmd == HPC_BUS_33CONVMODE) || (cmd == HPC_BUS_66CONVMODE) ||
+		(cmd == HPC_BUS_66PCIXMODE) || (cmd == HPC_BUS_100PCIXMODE) ||
+		(cmd == HPC_BUS_133PCIXMODE)) {
+		busindex = ibmphp_get_bus_index (pslot->bus);
+		if (busindex < 0) {
+			rc = -EINVAL;
+			err ("%s - Exit Error:invalid bus, rc[%d]\n", __FUNCTION__, rc);
+			return rc;
+		} else
+			index = (u8) busindex;
+	} else
+		index = pslot->ctlr_index;
+
+	index = hpc_writecmdtoindex (cmd, index);
+
+	if (index == HPC_ERROR) {
+		rc = -EINVAL;
+		err ("%s - Error Exit rc[%d]\n", __FUNCTION__, rc);
+		return rc;
+	}
+
+	ctlr_ptr = pslot->ctrl;
+
+	get_hpc_access ();
+
+	//--------------------------------------------------------------------
+	// map physical address to logical address
+	//--------------------------------------------------------------------
+	wpg_bbar = ioremap (ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE);
+
+	debug ("%s - ctlr id[%x] physical[%lx] logical[%lx] i2c[%x]\n", __FUNCTION__,
+		ctlr_ptr->ctlr_id, (ulong) (ctlr_ptr->u.wpeg_ctlr.wpegbbar), (ulong) wpg_bbar,
+		ctlr_ptr->u.wpeg_ctlr.i2c_addr);
+
+	//--------------------------------------------------------------------
+	// check controller status before writing
+	//--------------------------------------------------------------------
+	rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status);
+	if (!rc) {
+
+		ctrl_write (ctlr_ptr, wpg_bbar, index, cmd);
+
+		//--------------------------------------------------------------------
+		// check controller is still not working on the command
+		//--------------------------------------------------------------------
+		timeout = CMD_COMPLETE_TOUT_SEC;
+		done = FALSE;
+		while (!done) {
+			rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar,
+							&status);
+			if (!rc) {
+				if (NEEDTOCHECK_CMDSTATUS (cmd)) {
+					if (CTLR_FINISHED (status) == HPC_CTLR_FINISHED_YES)
+						done = TRUE;
+				} else
+					done = TRUE;
+			}
+			if (!done) {
+				long_delay (1 * HZ);
+				if (timeout < 1) {
+					done = TRUE;
+					err ("%s - Error command complete timeout\n", __FUNCTION__);
+					rc = -EFAULT;
+				} else
+					timeout--;
+			}
+		}
+		ctlr_ptr->status = status;
+	}
+	// cleanup
+	iounmap (wpg_bbar);	// remove physical to logical address mapping
+	free_hpc_access ();
+
+	debug_polling ("%s - Exit rc[%d]\n", __FUNCTION__, rc);
+	return rc;
+}
+
+/*----------------------------------------------------------------------
+* Name:    get_hpc_access()
+*
+* Action: make sure only one process can access HPC at one time
+*---------------------------------------------------------------------*/
+static void get_hpc_access (void)
+{
+	down (&sem_hpcaccess);
+}
+
+/*----------------------------------------------------------------------
+* Name:    free_hpc_access()
+*---------------------------------------------------------------------*/
+void free_hpc_access (void)
+{
+	up (&sem_hpcaccess);
+}
+
+/*----------------------------------------------------------------------
+* Name:    ibmphp_lock_operations()
+*
+* Action: make sure only one process can change the data structure
+*---------------------------------------------------------------------*/
+void ibmphp_lock_operations (void)
+{
+	down (&semOperations);
+	stop_polling = POLL_NO;
+	to_debug = TRUE;
+
+	/* waiting for polling to actually stop */
+	down (&sem_poll);
+}
+
+/*----------------------------------------------------------------------
+* Name:    ibmphp_unlock_operations()
+*---------------------------------------------------------------------*/
+void ibmphp_unlock_operations (void)
+{
+	debug ("%s - Entry\n", __FUNCTION__);
+	stop_polling = POLL_YES;
+	to_debug = FALSE;
+	up (&semOperations);
+	debug ("%s - Exit\n", __FUNCTION__);
+}
+
+/*----------------------------------------------------------------------
+* Name:    poll_hpc()
+*---------------------------------------------------------------------*/
+static void poll_hpc (void)
+{
+	struct slot myslot, *pslot = NULL;
+	struct list_head *pslotlist;
+	int rc;
+	u8 oldlatchlow = 0x00;
+	u8 curlatchlow = 0x00;
+	int pollcnt = 0;
+	u8 ctrl_count = 0x00;
+
+	debug ("poll_hpc - Entry\n");
+
+	while (!ibmphp_shutdown) {
+		if (stop_polling) {
+			debug ("poll_hpc - stop_polling\n");
+			up (&sem_poll); 
+			/* to prevent deadlock */
+			if (ibmphp_shutdown)
+				break;
+			/* to make the thread sleep */
+			down (&semOperations);
+			up (&semOperations);
+			debug ("poll_hpc - after stop_polling sleep\n");
+		} else {
+			if (pollcnt) {
+				// only poll the latch register
+				oldlatchlow = curlatchlow;
+
+				ctrl_count = 0x00;
+				list_for_each (pslotlist, &ibmphp_slot_head) {
+					if (ctrl_count >= ibmphp_get_total_controllers())
+						break;
+					pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
+					if (pslot->ctrl->ctlr_relative_id == ctrl_count) {
+						ctrl_count++;
+						if (READ_SLOT_LATCH (pslot->ctrl)) {
+							rc = ibmphp_hpc_readslot (pslot,
+										  READ_SLOTLATCHLOWREG,
+										  &curlatchlow);
+							if (oldlatchlow != curlatchlow)
+								process_changeinlatch (oldlatchlow,
+											curlatchlow);
+						}
+					}
+				}
+			} else {
+				list_for_each (pslotlist, &ibmphp_slot_head) {
+					if (stop_polling)
+						break;
+					pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
+					// make a copy of the old status
+					memcpy ((void *) &myslot, (void *) pslot,
+						sizeof (struct slot));
+					rc = ibmphp_hpc_readslot (pslot, READ_ALLSTAT, NULL);
+					if ((myslot.status != pslot->status)
+					    || (myslot.ext_status != pslot->ext_status))
+						process_changeinstatus (pslot, &myslot);
+				}
+
+				if (!stop_polling) {
+					ctrl_count = 0x00;
+					list_for_each (pslotlist, &ibmphp_slot_head) {
+						if (ctrl_count >= ibmphp_get_total_controllers())
+							break;
+						pslot =
+						    list_entry (pslotlist, struct slot,
+								ibm_slot_list);
+						if (pslot->ctrl->ctlr_relative_id == ctrl_count) {
+							ctrl_count++;
+							if (READ_SLOT_LATCH (pslot->ctrl))
+								rc = ibmphp_hpc_readslot (pslot,
+											  READ_SLOTLATCHLOWREG,
+											  &curlatchlow);
+						}
+					}
+				}
+			}
+			INCREMENT_POLLCNT (pollcnt);
+			long_delay (POLL_INTERVAL_SEC * HZ);	// snooze
+		}
+	}
+	up (&sem_poll);
+	up (&sem_exit);
+	debug ("poll_hpc - Exit\n");
+}
+
+
+/* ----------------------------------------------------------------------
+ *  Name:    ibmphp_hpc_fillhpslotinfo(hotplug_slot * phpslot)
+ *
+ *  Action:  fill out the hotplug_slot info
+ *
+ *  Input:   pointer to hotplug_slot
+ *
+ *  Return
+ *  Value:   0 or error codes
+ *-----------------------------------------------------------------------*/
+int ibmphp_hpc_fillhpslotinfo (struct hotplug_slot *phpslot)
+{
+	int rc = 0;
+	struct slot *pslot;
+
+	if (phpslot && phpslot->private) {
+		pslot = (struct slot *) phpslot->private;
+		rc = update_slot (pslot, (u8) TRUE);
+		if (!rc) {
+
+			// power - enabled:1  not:0
+			phpslot->info->power_status = SLOT_POWER (pslot->status);
+
+			// attention - off:0, on:1, blinking:2
+			phpslot->info->attention_status = SLOT_ATTN (pslot->status, pslot->ext_status);
+
+			// latch - open:1 closed:0
+			phpslot->info->latch_status = SLOT_LATCH (pslot->status);
+
+			// pci board - present:1 not:0
+			if (SLOT_PRESENT (pslot->status))
+				phpslot->info->adapter_status = 1;
+			else
+				phpslot->info->adapter_status = 0;
+/*
+			if (pslot->bus_on->supported_bus_mode
+				&& (pslot->bus_on->supported_speed == BUS_SPEED_66))
+				phpslot->info->max_bus_speed_status = BUS_SPEED_66PCIX;
+			else
+				phpslot->info->max_bus_speed_status = pslot->bus_on->supported_speed;
+*/		} else
+			rc = -EINVAL;
+	} else
+		rc = -EINVAL;
+
+	return rc;
+}
+
+/*----------------------------------------------------------------------
+* Name:    update_slot
+*
+* Action:  fill out slot status and extended status, controller status
+*
+* Input:   pointer to slot struct
+*---------------------------------------------------------------------*/
+static int update_slot (struct slot *pslot, u8 update)
+{
+	int rc = 0;
+
+	debug ("%s - Entry pslot[%lx]\n", __FUNCTION__, (ulong) pslot);
+	rc = ibmphp_hpc_readslot (pslot, READ_ALLSTAT, NULL);
+	debug ("%s - Exit rc[%d]\n", __FUNCTION__, rc);
+	return rc;
+}
+
+/*----------------------------------------------------------------------
+* Name:    process_changeinstatus
+*
+* Action:  compare old and new slot status, process the change in status
+*
+* Input:   pointer to slot struct, old slot struct
+*
+* Return   0 or error codes
+* Value:
+*
+* Side
+* Effects: None.
+*
+* Notes:
+*---------------------------------------------------------------------*/
+static int process_changeinstatus (struct slot *pslot, struct slot *poldslot)
+{
+	u8 status;
+	int rc = 0;
+	u8 disable = FALSE;
+	u8 update = FALSE;
+
+	debug ("process_changeinstatus - Entry pslot[%lx], poldslot[%lx]\n", (ulong) pslot,
+	       (ulong) poldslot);
+
+	// bit 0 - HPC_SLOT_POWER
+	if ((pslot->status & 0x01) != (poldslot->status & 0x01))
+		/* ????????? DO WE NEED TO UPDATE BUS SPEED INFO HERE ??? */
+		update = TRUE;
+
+	// bit 1 - HPC_SLOT_CONNECT
+	// ignore
+
+	// bit 2 - HPC_SLOT_ATTN
+	if ((pslot->status & 0x04) != (poldslot->status & 0x04))
+		update = TRUE;
+
+	// bit 3 - HPC_SLOT_PRSNT2
+	// bit 4 - HPC_SLOT_PRSNT1
+	if (((pslot->status & 0x08) != (poldslot->status & 0x08))
+		|| ((pslot->status & 0x10) != (poldslot->status & 0x10)))
+		update = TRUE;
+
+	// bit 5 - HPC_SLOT_PWRGD
+	if ((pslot->status & 0x20) != (poldslot->status & 0x20))
+		// OFF -> ON: ignore, ON -> OFF: disable slot
+		if (poldslot->status & 0x20)
+			disable = TRUE;
+
+	// bit 6 - HPC_SLOT_BUS_SPEED
+	// ignore
+
+	// bit 7 - HPC_SLOT_LATCH
+	if ((pslot->status & 0x80) != (poldslot->status & 0x80)) {
+		update = TRUE;
+		// OPEN -> CLOSE
+		if (pslot->status & 0x80) {
+			if (SLOT_POWER (pslot->status)) {
+				// power goes on and off after closing latch
+				// check again to make sure power is still ON
+				long_delay (1 * HZ);
+				rc = ibmphp_hpc_readslot (pslot, READ_SLOTSTATUS, &status);
+				if (SLOT_POWER (status))
+					update = TRUE;
+				else	// overwrite power in pslot to OFF
+					pslot->status &= ~HPC_SLOT_POWER;
+			}
+		}
+		// CLOSE -> OPEN 
+		else if ((SLOT_POWER (poldslot->status) == HPC_SLOT_POWER_ON)
+			|| (SLOT_CONNECT (poldslot->status) == HPC_SLOT_CONNECTED)) {
+			disable = TRUE;
+		}
+		// else - ignore
+	}
+	// bit 4 - HPC_SLOT_BLINK_ATTN
+	if ((pslot->ext_status & 0x08) != (poldslot->ext_status & 0x08))
+		update = TRUE;
+
+	if (disable) {
+		debug ("process_changeinstatus - disable slot\n");
+		pslot->flag = FALSE;
+		rc = ibmphp_disable_slot (pslot->hotplug_slot);
+	}
+
+	if (update || disable) {
+		ibmphp_update_slot_info (pslot);
+	}
+
+	debug ("%s - Exit rc[%d] disable[%x] update[%x]\n", __FUNCTION__, rc, disable, update);
+
+	return rc;
+}
+
+/*----------------------------------------------------------------------
+* Name:    process_changeinlatch
+*
+* Action:  compare old and new latch reg status, process the change
+*
+* Input:   old and current latch register status
+*
+* Return   0 or error codes
+* Value:
+*---------------------------------------------------------------------*/
+static int process_changeinlatch (u8 old, u8 new)
+{
+	struct slot myslot, *pslot;
+	u8 i;
+	u8 mask;
+	int rc = 0;
+
+	debug ("%s - Entry old[%x], new[%x]\n", __FUNCTION__, old, new);
+	// bit 0 reserved, 0 is LSB, check bit 1-6 for 6 slots
+
+	for (i = 1; i <= 6; i++) {
+		mask = 0x01 << i;
+		if ((mask & old) != (mask & new)) {
+			pslot = ibmphp_get_slot_from_physical_num (i);
+			if (pslot) {
+				memcpy ((void *) &myslot, (void *) pslot, sizeof (struct slot));
+				rc = ibmphp_hpc_readslot (pslot, READ_ALLSTAT, NULL);
+				debug ("%s - call process_changeinstatus for slot[%d]\n", __FUNCTION__, i);
+				process_changeinstatus (pslot, &myslot);
+			} else {
+				rc = -EINVAL;
+				err ("%s - Error bad pointer for slot[%d]\n", __FUNCTION__, i);
+			}
+		}
+	}
+	debug ("%s - Exit rc[%d]\n", __FUNCTION__, rc);
+	return rc;
+}
+
+/*----------------------------------------------------------------------
+* Name:    hpc_poll_thread
+*
+* Action:  polling
+*
+* Return   0
+* Value:
+*---------------------------------------------------------------------*/
+static int hpc_poll_thread (void *data)
+{
+	debug ("%s - Entry\n", __FUNCTION__);
+	lock_kernel ();
+	daemonize ();
+	reparent_to_init ();
+
+	//  New name
+	strcpy (current->comm, "hpc_poll");
+
+	unlock_kernel ();
+
+	poll_hpc ();
+
+	tid_poll = 0;
+	debug ("%s - Exit\n", __FUNCTION__);
+	return 0;
+}
+
+
+/*----------------------------------------------------------------------
+* Name:    ibmphp_hpc_start_poll_thread
+*
+* Action:  start polling thread
+*---------------------------------------------------------------------*/
+int ibmphp_hpc_start_poll_thread (void)
+{
+	int rc = 0;
+
+	debug ("ibmphp_hpc_start_poll_thread - Entry\n");
+
+	tid_poll = kernel_thread (hpc_poll_thread, 0, 0);
+	if (tid_poll < 0) {
+		err ("ibmphp_hpc_start_poll_thread - Error, thread not started\n");
+		rc = -1;
+	}
+
+	debug ("ibmphp_hpc_start_poll_thread - Exit tid_poll[%d] rc[%d]\n", tid_poll, rc);
+	return rc;
+}
+
+/*----------------------------------------------------------------------
+* Name:    ibmphp_hpc_stop_poll_thread
+*
+* Action:  stop polling thread and cleanup
+*---------------------------------------------------------------------*/
+void ibmphp_hpc_stop_poll_thread (void)
+{
+	debug ("ibmphp_hpc_stop_poll_thread - Entry\n");
+
+	ibmphp_shutdown = TRUE;
+	ibmphp_lock_operations ();
+
+	// wait for poll thread to exit
+	down (&sem_exit);
+
+	// cleanup
+	free_hpc_access ();
+	ibmphp_unlock_operations ();
+	up (&sem_poll);
+	up (&sem_exit);
+
+	debug ("ibmphp_hpc_stop_poll_thread - Exit\n");
+}
+
+/*----------------------------------------------------------------------
+* Name:    hpc_wait_ctlr_notworking
+*
+* Action:  wait until the controller is in a not working state
+*
+* Return   0, HPC_ERROR
+* Value:
+*---------------------------------------------------------------------*/
+static int hpc_wait_ctlr_notworking (int timeout, struct controller *ctlr_ptr, void *wpg_bbar,
+				    u8 * pstatus)
+{
+	int rc = 0;
+	u8 done = FALSE;
+
+	debug_polling ("hpc_wait_ctlr_notworking - Entry timeout[%d]\n", timeout);
+
+	while (!done) {
+		*pstatus = ctrl_read (ctlr_ptr, wpg_bbar, WPG_CTLR_INDEX);
+		if (*pstatus == HPC_ERROR) {
+			rc = HPC_ERROR;
+			done = TRUE;
+		}
+		if (CTLR_WORKING (*pstatus) == HPC_CTLR_WORKING_NO)
+			done = TRUE;
+		if (!done) {
+			long_delay (1 * HZ);
+			if (timeout < 1) {
+				done = TRUE;
+				err ("HPCreadslot - Error ctlr timeout\n");
+				rc = HPC_ERROR;
+			} else
+				timeout--;
+		}
+	}
+	debug_polling ("hpc_wait_ctlr_notworking - Exit rc[%x] status[%x]\n", rc, *pstatus);
+	return rc;
+}

drivers/hotplug/ibmphp_pci.c

+/*
+ * IBM Hot Plug Controller Driver
+ * 
+ * Written By: Irene Zubarev, IBM Corporation
+ * 
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (c) 2001,2002 IBM Corp.
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <gregkh@us.ibm.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/list.h>
+#include "ibmphp.h"
+
+
+static int configure_device(struct pci_func *);
+static int configure_bridge(struct pci_func **, u8);
+static struct res_needed *scan_behind_bridge(struct pci_func *, u8);
+static int add_new_bus (struct bus_node *, struct resource_node *, struct resource_node *, struct resource_node *, u8);
+static u8 find_sec_number (u8 primary_busno, u8 slotno);
+
+/*
+ * NOTE..... If BIOS doesn't provide default routing, we assign:
+ * 9 for SCSI, 10 for LAN adapters, and 11 for everything else. 
+ * If adapter is bridged, then we assign 11 to it and devices behind it.
+ * We also assign the same irq numbers for multi function devices.
+ * These are PIC mode, so shouldn't matter n.e.ways (hopefully)
+ */
+static void assign_alt_irq (struct pci_func * cur_func, u8 class_code)
+{
+	int j = 0;
+	for (j = 0; j < 4; j++) {
+		if (cur_func->irq[j] == 0xff) {
+			switch (class_code) {
+				case PCI_BASE_CLASS_STORAGE:
+					cur_func->irq[j] = SCSI_IRQ;
+					break;
+				case PCI_BASE_CLASS_NETWORK:
+					cur_func->irq[j] = LAN_IRQ;
+					break;
+				default:
+					cur_func->irq[j] = OTHER_IRQ;
+					break;
+			}
+		}
+	}
+}
+
+/*
+ * Configures the device to be added (will allocate needed resources if it
+ * can), the device can be a bridge or a regular pci device, can also be
+ * multi-functional
+ * 
+ * Input: function to be added
+ * 
+ * TO DO:  The error case with Multifunction device or multi function bridge,
+ * if there is an error, will need to go through all previous functions and 
+ * unconfigure....or can add some code into unconfigure_card....
+ */
+int ibmphp_configure_card (struct pci_func *func, u8 slotno)
+{
+	u16 vendor_id;
+	u32 class;
+	u8 class_code;
+	u8 hdr_type, device, sec_number;
+	u8 function;
+	struct pci_func *newfunc;	/* for multi devices */
+	struct pci_func *cur_func, *prev_func;
+	int rc, i, j;
+	int cleanup_count;
+	u8 flag;
+	u8 valid_device = 0x00; /* to see if we are able to read from card any device info at all */
+
+	debug ("inside configure_card, func->busno = %x \n", func->busno);
+
+	device = func->device;
+	cur_func = func;
+
+	/* We only get bus and device from IRQ routing table.  So at this point,
+	 * func->busno is correct, and func->device contains only device (at the 5 
+	 * highest bits)
+	 */
+
+	/* For every function on the card */
+	for (function = 0x00; function < 0x08; function++) {
+		cur_func->function = function;
+
+		debug ("inside the loop, cur_func->busno = %x, cur_func->device = %x, cur_func->funcion = %x\n", cur_func->busno, device, function);
+
+		pci_read_config_word_nodev (ibmphp_pci_root_ops, cur_func->busno, device, function, PCI_VENDOR_ID, &vendor_id);
+
+		debug ("vendor_id is %x\n", vendor_id);
+		if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
+			/* found correct device!!! */
+			debug ("found valid device, vendor_id = %x\n", vendor_id);
+
+			++valid_device;
+
+			/* header: x x x x x x x x
+			 *         | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge
+			 *         |_=> 0 = single function device, 1 = multi-function device
+			 */
+
+			pci_read_config_byte_nodev (ibmphp_pci_root_ops, cur_func->busno, device, function, PCI_HEADER_TYPE, &hdr_type);
+			pci_read_config_dword_nodev (ibmphp_pci_root_ops, cur_func->busno, device, function, PCI_CLASS_REVISION, &class);
+
+			class_code = class >> 24;
+			debug ("hrd_type = %x, class = %x, class_code %x \n", hdr_type, class, class_code);
+			class >>= 8;	/* to take revision out, class = class.subclass.prog i/f */
+			if (class == PCI_CLASS_NOT_DEFINED_VGA) {
+				err ("The device %x is VGA compatible and as is not supported for hot plugging. "
+				     "Please choose another device.\n", cur_func->device);
+				return -ENODEV;
+			} else if (class == PCI_CLASS_DISPLAY_VGA) {
+				err ("The device %x is not supported for hot plugging. "
+				     "Please choose another device.\n", cur_func->device);
+				return -ENODEV;
+			}
+			switch (hdr_type) {
+				case PCI_HEADER_TYPE_NORMAL:
+					debug ("single device case.... vendor id = %x, hdr_type = %x, class = %x\n", vendor_id, hdr_type, class);
+					assign_alt_irq (cur_func, class_code);
+					if ((rc = configure_device (cur_func)) < 0) {
+						/* We need to do this in case some other BARs were properly inserted */
+						err ("was not able to configure devfunc %x on bus %x. \n",
+						     cur_func->device, cur_func->busno);
+						cleanup_count = 6;
+						goto error;
+					}	
+					cur_func->next = NULL;
+					function = 0x8;
+					break;
+				case PCI_HEADER_TYPE_MULTIDEVICE:
+					assign_alt_irq (cur_func, class_code);
+					if ((rc = configure_device (cur_func)) < 0) {
+						/* We need to do this in case some other BARs were properly inserted */
+						err ("was not able to configure devfunc %x on bus %x...bailing out\n",
+						     cur_func->device, cur_func->busno);
+						cleanup_count = 6;
+						goto error;
+					}
+					newfunc = (struct pci_func *) kmalloc (sizeof (struct pci_func), GFP_KERNEL);
+					if (!newfunc) {
+						err ("out of system memory \n");
+						return -ENOMEM;
+					}
+					memset (newfunc, 0, sizeof (struct pci_func));
+					newfunc->busno = cur_func->busno;
+					newfunc->device = device;
+					cur_func->next = newfunc;
+					cur_func = newfunc;
+					for (j = 0; j < 4; j++)
+						newfunc->irq[j] = cur_func->irq[j];
+					break;
+				case PCI_HEADER_TYPE_MULTIBRIDGE:
+					class >>= 8;
+					if (class != PCI_CLASS_BRIDGE_PCI) {
+						err ("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. "
+						     "Please insert another card.\n", cur_func->device);
+						return -ENODEV;
+					}
+					assign_alt_irq (cur_func, class_code);
+					rc = configure_bridge (&cur_func, slotno);
+					if (rc == -ENODEV) {
+						err ("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
+						err ("Bus %x, devfunc %x \n", cur_func->busno, cur_func->device);
+						return rc;
+					}
+					if (rc) {
+						/* We need to do this in case some other BARs were properly inserted */
+						err ("was not able to hot-add PPB properly.\n");
+						func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
+						cleanup_count = 2;
+						goto error;
+					}
+
+					pci_read_config_byte_nodev (ibmphp_pci_root_ops, cur_func->busno, device, function, PCI_SECONDARY_BUS, &sec_number);
+					flag = FALSE;
+					for (i = 0; i < 32; i++) {
+						if (func->devices[i]) {
+							newfunc = (struct pci_func *) kmalloc (sizeof (struct pci_func), GFP_KERNEL);
+							if (!newfunc) {
+								err ("out of system memory \n");
+								return -ENOMEM;
+							}
+							memset (newfunc, 0, sizeof (struct pci_func));
+							newfunc->busno = sec_number;
+							newfunc->device = (u8) i;
+							for (j = 0; j < 4; j++)
+								newfunc->irq[j] = cur_func->irq[j];
+
+							if (flag) {
+								for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
+								prev_func->next = newfunc;
+							} else
+								cur_func->next = newfunc;
+
+							rc = ibmphp_configure_card (newfunc, slotno);
+							/* This could only happen if kmalloc failed */
+							if (rc) {
+								/* We need to do this in case bridge itself got configured properly, but devices behind it failed */
+								func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
+								cleanup_count = 2;
+								goto error;
+							}
+							flag = TRUE;
+						}
+					}
+
+					newfunc = (struct pci_func *) kmalloc (sizeof (struct pci_func), GFP_KERNEL);
+					if (!newfunc) {
+						err ("out of system memory \n");
+						return -ENOMEM;
+					}
+					memset (newfunc, 0, sizeof (struct pci_func));
+					newfunc->busno = cur_func->busno;
+					newfunc->device = device;
+					for (j = 0; j < 4; j++)
+						newfunc->irq[j] = cur_func->irq[j];
+					for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
+					prev_func->next = newfunc;
+					cur_func = newfunc;
+					break;
+				case PCI_HEADER_TYPE_BRIDGE:
+					class >>= 8;
+					debug ("class now is %x\n", class);
+					if (class != PCI_CLASS_BRIDGE_PCI) {
+						err ("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. "
+						     "Please insert another card.\n", cur_func->device);
+						return -ENODEV;
+					}
+
+					assign_alt_irq (cur_func, class_code);
+
+					debug ("cur_func->busno b4 configure_bridge is %x\n", cur_func->busno);
+					rc = configure_bridge (&cur_func, slotno);
+					if (rc == -ENODEV) {
+						err ("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
+						err ("Bus %x, devfunc %x \n", cur_func->busno, cur_func->device);
+						return rc;
+					}
+					if (rc) {
+						/* We need to do this in case some other BARs were properly inserted */
+						func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
+						err ("was not able to hot-add PPB properly.\n");
+						cleanup_count = 2;
+						goto error;
+					}
+					debug ("cur_func->busno = %x, device = %x, function = %x\n", cur_func->busno, device, function);
+					pci_read_config_byte_nodev (ibmphp_pci_root_ops, cur_func->busno, device, function, PCI_SECONDARY_BUS, &sec_number);
+					debug ("after configuring bridge..., sec_number = %x\n", sec_number);
+					flag = FALSE;
+					for (i = 0; i < 32; i++) {
+						if (func->devices[i]) {
+							debug ("inside for loop, device is %x\n", i);
+							newfunc = (struct pci_func *) kmalloc (sizeof (struct pci_func), GFP_KERNEL);
+							if (!newfunc) {
+								err (" out of system memory \n");
+								return -ENOMEM;
+							}
+							memset (newfunc, 0, sizeof (struct pci_func));
+							newfunc->busno = sec_number;
+							newfunc->device = (u8) i;
+							for (j = 0; j < 4; j++)
+								newfunc->irq[j] = cur_func->irq[j];
+
+							if (flag) {
+								for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
+								prev_func->next = newfunc;
+							} else
+								cur_func->next = newfunc;
+
+							rc = ibmphp_configure_card (newfunc, slotno);
+
+							/* Again, this case should not happen... For complete paranoia, will need to call remove_bus */
+							if (rc) {
+								/* We need to do this in case some other BARs were properly inserted */
+								func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
+								cleanup_count = 2;
+								goto error;
+							}
+							flag = TRUE;
+						}
+					}
+
+					function = 0x8;
+					break;
+				default:
+					err ("MAJOR PROBLEM!!!!, header type not supported? %x\n", hdr_type);
+					return -ENXIO;
+					break;
+			}	/* end of switch */
+		}	/* end of valid device */
+	}	/* end of for */
+
+	if (!valid_device) {
+		err ("Cannot find any valid devices on the card.  Or unable to read from card.\n");
+		return -ENODEV;
+	}
+
+	return 0;
+
+error:
+	for (i = 0; i < cleanup_count; i++) {
+		if (cur_func->io[i]) {
+			ibmphp_remove_resource (cur_func->io[i]);
+			cur_func->io[i] = NULL;
+		} else if (cur_func->pfmem[i]) {
+			ibmphp_remove_resource (cur_func->pfmem[i]);
+			cur_func->pfmem[i] = NULL;
+		} else if (cur_func->mem[i]) {
+			ibmphp_remove_resource (cur_func->mem[i]);
+			cur_func->mem[i] = NULL;
+		}
+	}
+	return rc;
+}
+
+/*
+ * This function configures the pci BARs of a single device.  
+ * Input: pointer to the pci_func
+ * Output: configured PCI, 0, or error
+ */
+static int configure_device (struct pci_func *func)
+{
+	u32 bar[6];
+	u32 address[] = {
+		PCI_BASE_ADDRESS_0,
+		PCI_BASE_ADDRESS_1,
+		PCI_BASE_ADDRESS_2,
+		PCI_BASE_ADDRESS_3,
+		PCI_BASE_ADDRESS_4,
+		PCI_BASE_ADDRESS_5,
+		0
+	};
+	u8 irq;
+	int count;
+	int len[6];
+	struct resource_node *io[6];
+	struct resource_node *mem[6];
+	struct resource_node *mem_tmp;
+	struct resource_node *pfmem[6];
+	u8 device;
+	u8 function;
+
+	debug ("%s - inside\n", __FUNCTION__);
+
+	device = func->device;
+	function = func->function;
+
+	for (count = 0; address[count]; count++) {	/* for 6 BARs */
+
+		/* not sure if i need this.  per scott, said maybe need smth like this
+		   if devices don't adhere 100% to the spec, so don't want to write
+		   to the reserved bits
+
+		pcibios_read_config_byte(cur_func->busno, cur_func->device, 
+		PCI_BASE_ADDRESS_0 + 4 * count, &tmp);
+		if (tmp & 0x01) // IO
+			pcibios_write_config_dword(cur_func->busno, cur_func->device, 
+			PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFD);
+		else  // Memory
+			pcibios_write_config_dword(cur_func->busno, cur_func->device, 
+			PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFF);
+		 */
+		pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], 0xFFFFFFFF);
+		pci_read_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], &bar[count]);
+
+		if (!bar[count])	/* This BAR is not implemented */
+			continue;
+
+		debug ("Device %x BAR %d wants %x\n", func->device, count, bar[count]);
+
+		if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
+			/* This is IO */
+			debug ("inside IO SPACE\n");
+
+			len[count] = bar[count] & 0xFFFFFFFC;
+			len[count] = ~len[count] + 1;
+
+			debug ("len[count] in IO %x, count %d\n", len[count], count);
+
+			io[count] = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+
+			if (!io[count]) {
+				err ("out of system memory \n");
+				return -ENOMEM;
+			}
+			memset (io[count], 0, sizeof (struct resource_node));
+			io[count]->type = IO;
+			io[count]->busno = func->busno;
+			io[count]->devfunc = ((func->device << 3) | (func->function & 0x7));
+			io[count]->len = len[count];
+			if (ibmphp_check_resource(io[count], 0) == 0) {
+				ibmphp_add_resource (io[count]);
+				func->io[count] = io[count];
+			} else {
+				err ("cannot allocate requested io for bus %x device %x function %x len %x\n",
+				     func->busno, func->device, func->function, len[count]);
+				kfree (io[count]);
+				return -EIO;
+			}
+			pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], func->io[count]->start);
+	
+			/* _______________This is for debugging purposes only_____________________ */ 
+			debug ("b4 writing, the IO address is %x\n", func->io[count]->start);
+			pci_read_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], &bar[count]);
+			debug ("after writing.... the start address is %x\n", bar[count]);
+			/* _________________________________________________________________________*/
+
+		} else {
+			/* This is Memory */
+			if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
+				/* pfmem */
+				debug ("PFMEM SPACE\n");
+
+				len[count] = bar[count] & 0xFFFFFFF0;
+				len[count] = ~len[count] + 1;
+
+				debug ("len[count] in PFMEM %x, count %d\n", len[count], count);
+
+				pfmem[count] = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+				if (!pfmem[count]) {
+					err ("out of system memory \n");
+					return -ENOMEM;
+				}
+				memset (pfmem[count], 0, sizeof (struct resource_node));
+				pfmem[count]->type = PFMEM;
+				pfmem[count]->busno = func->busno;
+				pfmem[count]->devfunc = ((func->device << 3) | (func->function & 0x7));
+				pfmem[count]->len = len[count];
+				pfmem[count]->fromMem = FALSE;
+				if (ibmphp_check_resource (pfmem[count], 0) == 0) {
+					ibmphp_add_resource (pfmem[count]);
+					func->pfmem[count] = pfmem[count];
+				} else {
+					mem_tmp = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+					if (!mem_tmp) {
+						err ("out of system memory \n");
+						kfree (pfmem[count]);
+						return -ENOMEM;
+					}
+					memset (mem_tmp, 0, sizeof (struct resource_node));
+					mem_tmp->type = MEM;
+					mem_tmp->busno = pfmem[count]->busno;
+					mem_tmp->devfunc = pfmem[count]->devfunc;
+					mem_tmp->len = pfmem[count]->len;
+					debug ("there's no pfmem... going into mem.\n");
+					if (ibmphp_check_resource (mem_tmp, 0) == 0) {
+						ibmphp_add_resource (mem_tmp);
+						pfmem[count]->fromMem = TRUE;
+						pfmem[count]->rangeno = mem_tmp->rangeno;
+						pfmem[count]->start = mem_tmp->start;
+						pfmem[count]->end = mem_tmp->end;
+						ibmphp_add_pfmem_from_mem (pfmem[count]);
+						func->pfmem[count] = pfmem[count];
+					} else {
+						err ("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
+						     func->busno, func->device, len[count]);
+						kfree (mem_tmp);
+						kfree (pfmem[count]);
+						return -EIO;
+					}
+				}
+
+				pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], func->pfmem[count]->start);
+
+				/*_______________This if for debugging purposes only______________________________*/				
+				debug ("b4 writing, start addres is %x\n", func->pfmem[count]->start);
+				pci_read_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], &bar[count]);
+				debug ("after writing, start address is %x\n", bar[count]);
+				/*_________________________________________________________________________________*/
+
+				if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {	/* takes up another dword */
+					debug ("inside the mem 64 case, count %d\n", count);
+					count += 1;
+					/* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
+					pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], 0x00000000);
+				}
+			} else {
+				/* regular memory */
+				debug ("REGULAR MEM SPACE\n");
+
+				len[count] = bar[count] & 0xFFFFFFF0;
+				len[count] = ~len[count] + 1;
+
+				debug ("len[count] in Mem %x, count %d\n", len[count], count);
+
+				mem[count] = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+				if (!mem[count]) {
+					err ("out of system memory \n");
+					return -ENOMEM;
+				}
+				memset (mem[count], 0, sizeof (struct resource_node));
+				mem[count]->type = MEM;
+				mem[count]->busno = func->busno;
+				mem[count]->devfunc = ((func->device << 3) | (func->function & 0x7));
+				mem[count]->len = len[count];
+				if (ibmphp_check_resource (mem[count], 0) == 0) {
+					ibmphp_add_resource (mem[count]);
+					func->mem[count] = mem[count];
+				} else {
+					err ("cannot allocate requested mem for bus %x, device %x, len %x\n",
+					     func->busno, func->device, len[count]);
+					kfree (mem[count]);
+					return -EIO;
+				}
+				pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], func->mem[count]->start);
+				/* _______________________This is for debugging purposes only _______________________*/
+				debug ("b4 writing, start address is %x\n", func->mem[count]->start);
+				pci_read_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], &bar[count]);
+				debug ("after writing, the address is %x\n", bar[count]);
+				/* __________________________________________________________________________________*/
+
+				if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
+					/* takes up another dword */
+					debug ("inside mem 64 case, reg. mem, count %d\n", count);
+					count += 1;
+					/* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
+					pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], 0x00000000);
+				}
+			}
+		}		/* end of mem */
+	}			/* end of for */
+
+	func->bus = 0;		/* To indicate that this is not a PPB */
+	pci_read_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_INTERRUPT_PIN, &irq);
+	if ((irq > 0x00) && (irq < 0x05))
+		pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
+
+	pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_CACHE_LINE_SIZE, CACHE);
+	pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_LATENCY_TIMER, LATENCY);
+
+	pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_ROM_ADDRESS, 0x00L);
+	pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_COMMAND, DEVICEENABLE);
+
+	return 0;
+}
+
+/******************************************************************************
+ * This routine configures a PCI-2-PCI bridge and the functions behind it
+ * Parameters: pci_func
+ * Returns: 
+ ******************************************************************************/
+static int configure_bridge (struct pci_func **func_passed, u8 slotno)
+{
+	int count;
+	int i;
+	int rc;
+	u8 sec_number;
+	u8 io_base;
+	u16 pfmem_base;
+	u32 bar[2];
+	u32 len[2];
+	u8 flag_io = FALSE;
+	u8 flag_mem = FALSE;
+	u8 flag_pfmem = FALSE;
+	u8 need_io_upper = FALSE;
+	u8 need_pfmem_upper = FALSE;
+	struct res_needed *amount_needed = NULL;
+	struct resource_node *io = NULL;
+	struct resource_node *bus_io[2] = {NULL, NULL};
+	struct resource_node *mem = NULL;
+	struct resource_node *bus_mem[2] = {NULL, NULL};
+	struct resource_node *mem_tmp = NULL;
+	struct resource_node *pfmem = NULL;
+	struct resource_node *bus_pfmem[2] = {NULL, NULL};
+	struct bus_node *bus;
+	u32 address[] = {
+		PCI_BASE_ADDRESS_0,
+		PCI_BASE_ADDRESS_1,
+		0
+	};
+	struct pci_func *func = *func_passed;
+	u8 function;
+	u8 device;
+	u8 irq;
+	int retval;
+
+	debug ("%s - enter\n", __FUNCTION__);
+
+	function = func->function;
+	device = func->device;
+
+	/* Configuring necessary info for the bridge so that we could see the devices
+	 * behind it
+	 */
+
+	pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PRIMARY_BUS, func->busno);
+
+	/* _____________________For debugging purposes only __________________________
+	pci_read_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PRIMARY_BUS, &pri_number);
+	debug ("primary # written into the bridge is %x\n", pri_number);
+	 ___________________________________________________________________________*/
+
+	/* in EBDA, only get allocated 1 additional bus # per slot */
+	sec_number = find_sec_number (func->busno, slotno);
+	if (sec_number == 0xff) {
+		err ("cannot allocate secondary bus number for the bridged device \n");
+		return -EINVAL;
+	}
+
+	debug ("after find_sec_number, the number we got is %x\n", sec_number);
+	debug ("AFTER FIND_SEC_NUMBER, func->busno IS %x\n", func->busno);
+
+	pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_SECONDARY_BUS, sec_number);
+	
+	/* __________________For debugging purposes only __________________________________
+	pci_read_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_SECONDARY_BUS, &sec_number);
+	debug ("sec_number after write/read is %x\n", sec_number);
+	 ________________________________________________________________________________*/
+
+	pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_SUBORDINATE_BUS, sec_number);
+
+	/* __________________For debugging purposes only ____________________________________
+	pci_read_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_SUBORDINATE_BUS, &sec_number);
+	debug ("subordinate number after write/read is %x\n", sec_number);
+	 __________________________________________________________________________________*/
+
+	pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_CACHE_LINE_SIZE, CACHE);
+	pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_LATENCY_TIMER, LATENCY);
+	pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_SEC_LATENCY_TIMER, LATENCY);
+
+	debug ("func->busno is %x\n", func->busno);
+	debug ("sec_number after writing is %x\n", sec_number);
+
+
+	/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	   !!!!!!!!!!!!!!!NEED TO ADD!!!  FAST BACK-TO-BACK ENABLE!!!!!!!!!!!!!!!!!!!! 
+	   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
+
+
+	/* First we need to allocate mem/io for the bridge itself in case it needs it */
+	for (count = 0; address[count]; count++) {	/* for 2 BARs */
+		pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], 0xFFFFFFFF);
+		pci_read_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], &bar[count]);
+
+		if (!bar[count]) {
+			/* This BAR is not implemented */
+			debug ("so we come here then, eh?, count = %d\n", count);
+			continue;
+		}
+		//  tmp_bar = bar[count];
+
+		debug ("Bar %d wants %x\n", count, bar[count]);
+
+		if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
+			/* This is IO */
+			len[count] = bar[count] & 0xFFFFFFFC;
+			len[count] = ~len[count] + 1;
+
+			debug ("len[count] in IO = %x\n", len[count]);
+
+			bus_io[count] = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+		
+			if (!bus_io[count]) {
+				err ("out of system memory \n");
+				retval = -ENOMEM;
+				goto error;
+			}
+			memset (bus_io[count], 0, sizeof (struct resource_node));
+			bus_io[count]->type = IO;
+			bus_io[count]->busno = func->busno;
+			bus_io[count]->devfunc = ((func->device << 3) | (func->function & 0x7));
+			bus_io[count]->len = len[count];
+			if (ibmphp_check_resource (bus_io[count], 0) == 0) {
+				ibmphp_add_resource (bus_io[count]);
+				func->io[count] = bus_io[count];
+			} else {
+				err ("cannot allocate requested io for bus %x, device %x, len %x\n",
+				     func->busno, func->device, len[count]);
+				kfree (bus_io[count]);
+				return -EIO;
+			}
+
+			pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], func->io[count]->start);
+
+		} else {
+			/* This is Memory */
+			if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
+				/* pfmem */
+				len[count] = bar[count] & 0xFFFFFFF0;
+				len[count] = ~len[count] + 1;
+
+				debug ("len[count] in PFMEM = %x\n", len[count]);
+
+				bus_pfmem[count] = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+				if (!bus_pfmem[count]) {
+					err ("out of system memory \n");
+					retval = -ENOMEM;
+					goto error;
+				}
+				memset (bus_pfmem[count], 0, sizeof (struct resource_node));
+				bus_pfmem[count]->type = PFMEM;
+				bus_pfmem[count]->busno = func->busno;
+				bus_pfmem[count]->devfunc = ((func->device << 3) | (func->function & 0x7));
+				bus_pfmem[count]->len = len[count];
+				bus_pfmem[count]->fromMem = FALSE;
+				if (ibmphp_check_resource (bus_pfmem[count], 0) == 0) {
+					ibmphp_add_resource (bus_pfmem[count]);
+					func->pfmem[count] = bus_pfmem[count];
+				} else {
+					mem_tmp = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+					if (!mem_tmp) {
+						err ("out of system memory \n");
+						retval = -ENOMEM;
+						goto error;
+					}
+					memset (mem_tmp, 0, sizeof (struct resource_node));
+					mem_tmp->type = MEM;
+					mem_tmp->busno = bus_pfmem[count]->busno;
+					mem_tmp->devfunc = bus_pfmem[count]->devfunc;
+					mem_tmp->len = bus_pfmem[count]->len;
+					if (ibmphp_check_resource (mem_tmp, 0) == 0) {
+						ibmphp_add_resource (mem_tmp);
+						bus_pfmem[count]->fromMem = TRUE;
+						bus_pfmem[count]->rangeno = mem_tmp->rangeno;
+						ibmphp_add_pfmem_from_mem (bus_pfmem[count]);
+						func->pfmem[count] = bus_pfmem[count];
+					} else {
+						err ("cannot allocate requested pfmem for bus %x, device %x, len %x\n", 
+						     func->busno, func->device, len[count]);
+						kfree (mem_tmp);
+						kfree (bus_pfmem[count]);
+						return -EIO;
+					}
+				}
+
+				pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], func->pfmem[count]->start);
+
+				if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
+					/* takes up another dword */
+					count += 1;
+					/* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
+					pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], 0x00000000);
+
+				}
+			} else {
+				/* regular memory */
+				len[count] = bar[count] & 0xFFFFFFF0;
+				len[count] = ~len[count] + 1;
+
+				debug ("len[count] in Memory is %x\n", len[count]);
+
+				bus_mem[count] = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+				if (!bus_mem[count]) {
+					err ("out of system memory \n");
+					retval = -ENOMEM;
+					goto error;
+				}
+				memset (bus_mem[count], 0, sizeof (struct resource_node));
+				bus_mem[count]->type = MEM;
+				bus_mem[count]->busno = func->busno;
+				bus_mem[count]->devfunc = ((func->device << 3) | (func->function & 0x7));
+				bus_mem[count]->len = len[count];
+				if (ibmphp_check_resource (bus_mem[count], 0) == 0) {
+					ibmphp_add_resource (bus_mem[count]);
+					func->mem[count] = bus_mem[count];
+				} else {
+					err ("cannot allocate requested mem for bus %x, device %x, len %x\n",
+					     func->busno, func->device, len[count]);
+					kfree (bus_mem[count]);
+					return -EIO;
+				}
+
+				pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], func->mem[count]->start);
+
+				if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
+					/* takes up another dword */
+					count += 1;
+					/* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
+					pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, address[count], 0x00000000);
+
+				}
+			}
+		}		/* end of mem */
+	}			/* end of for  */
+
+	/* Now need to see how much space the devices behind the bridge needed */
+	amount_needed = scan_behind_bridge (func, sec_number);
+	if (amount_needed == NULL)
+		return -ENOMEM;
+
+	debug ("after coming back from scan_behind_bridge\n");
+	debug ("amount_needed->not_correct = %x\n", amount_needed->not_correct);
+	debug ("amount_needed->io = %x\n", amount_needed->io);
+	debug ("amount_needed->mem = %x\n", amount_needed->mem);
+	debug ("amount_needed->pfmem =  %x\n", amount_needed->pfmem);
+
+	if (amount_needed->not_correct) {		
+		debug ("amount_needed is not correct \n");
+		for (count = 0; address[count]; count++) {
+			/* for 2 BARs */
+			if (bus_io[count]) {
+				ibmphp_remove_resource (bus_io[count]);
+				func->io[count] = NULL;
+			} else if (bus_pfmem[count]) {
+				ibmphp_remove_resource (bus_pfmem[count]);
+				func->pfmem[count] = NULL;
+			} else if (bus_mem[count]) {
+				ibmphp_remove_resource (bus_mem[count]);
+				func->mem[count] = NULL;
+			}
+		}
+		kfree (amount_needed);
+		return -ENODEV;
+	}
+
+	if (!amount_needed->io) {
+		debug ("it doesn't want IO?\n");
+		flag_io = TRUE;
+	} else {
+		debug ("it wants %x IO behind the bridge \n", amount_needed->io);
+		io = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+		
+		if (!io) {
+			err ("out of system memory \n");
+			retval = -ENOMEM;
+			goto error;
+		}
+		memset (io, 0, sizeof (struct resource_node));
+		io->type = IO;
+		io->busno = func->busno;
+		io->devfunc = ((func->device << 3) | (func->function & 0x7));
+		io->len = amount_needed->io;
+		if (ibmphp_check_resource (io, 1) == 0) {
+			debug ("were we able to add io\n");
+			ibmphp_add_resource (io);
+			flag_io = TRUE;
+		}
+	}
+
+	if (!amount_needed->mem) {
+		debug ("it doesn't want n.e.memory?\n");
+		flag_mem = TRUE;
+	} else {
+		debug ("it wants %x memory behind the bridge\n", amount_needed->mem);
+		mem = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+		if (!mem) {
+			err ("out of system memory \n");
+			retval = -ENOMEM;
+			goto error;
+		}
+		memset (mem, 0, sizeof (struct resource_node));
+		mem->type = MEM;
+		mem->busno = func->busno;
+		mem->devfunc = ((func->device << 3) | (func->function & 0x7));
+		mem->len = amount_needed->mem;
+		if (ibmphp_check_resource (mem, 1) == 0) {
+			ibmphp_add_resource (mem);
+			flag_mem = TRUE;
+			debug ("were we able to add mem\n");
+		}
+	}
+
+	if (!amount_needed->pfmem) {
+		debug ("it doesn't want n.e.pfmem mem?\n");
+		flag_pfmem = TRUE;
+	} else {
+		debug ("it wants %x pfmemory behind the bridge\n", amount_needed->pfmem);
+		pfmem = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+		if (!pfmem) {
+			err ("out of system memory \n");
+			retval = -ENOMEM;
+			goto error;
+		}
+		memset (pfmem, 0, sizeof (struct resource_node));
+		pfmem->type = PFMEM;
+		pfmem->busno = func->busno;
+		pfmem->devfunc = ((func->device << 3) | (func->function & 0x7));
+		pfmem->len = amount_needed->pfmem;
+		pfmem->fromMem = FALSE;
+		if (ibmphp_check_resource (pfmem, 1) == 0) {
+			ibmphp_add_resource (pfmem);
+			flag_pfmem = TRUE;
+		} else {
+			mem_tmp = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+			if (!mem_tmp) {
+				err ("out of system memory \n");
+				retval = -ENOMEM;
+				goto error;
+			}
+			memset (mem_tmp, 0, sizeof (struct resource_node));
+			mem_tmp->type = MEM;
+			mem_tmp->busno = pfmem->busno;
+			mem_tmp->devfunc = pfmem->devfunc;
+			mem_tmp->len = pfmem->len;
+			if (ibmphp_check_resource (mem_tmp, 1) == 0) {
+				ibmphp_add_resource (mem_tmp);
+				pfmem->fromMem = TRUE;
+				pfmem->rangeno = mem_tmp->rangeno;
+				ibmphp_add_pfmem_from_mem (pfmem);
+				flag_pfmem = TRUE;
+			}
+		}
+	}
+
+	debug ("b4 if (flag_io && flag_mem && flag_pfmem)\n");
+	debug ("flag_io = %x, flag_mem = %x, flag_pfmem = %x\n", flag_io, flag_mem, flag_pfmem);
+
+	if (flag_io && flag_mem && flag_pfmem) {
+		bus = kmalloc (sizeof (struct bus_node), GFP_KERNEL);
+		if (!bus) {
+			err ("out of system memory \n");
+			retval = -ENOMEM;
+			goto error;
+		}
+		memset (bus, 0, sizeof (struct bus_node));
+		bus->busno = sec_number;
+		debug ("b4 adding new bus\n");
+		rc = add_new_bus (bus, io, mem, pfmem, func->busno);
+		if (rc) {
+			if (rc == -ENOMEM) {
+				ibmphp_remove_bus (bus, func->busno);
+				return rc;
+			}
+			retval = rc;
+			goto error;
+		}
+		pci_read_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_IO_BASE, &io_base);
+		pci_read_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PREF_MEMORY_BASE, &pfmem_base);
+
+		if ((io_base & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
+			debug ("io 32\n");
+			need_io_upper = TRUE;
+		}
+		if ((io_base & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
+			debug ("pfmem 64\n");
+			need_pfmem_upper = TRUE;
+		}
+
+		if (bus->noIORanges) {
+			pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_IO_BASE, 0x00 | bus->rangeIO->start >> 8);
+			pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_IO_LIMIT, 0x00 | bus->rangeIO->end >> 8);	
+
+			/* _______________This is for debugging purposes only ____________________
+			pci_read_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_IO_BASE, &temp);
+			debug ("io_base = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
+			pci_read_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_IO_LIMIT, &temp);
+			debug ("io_limit = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
+			 ________________________________________________________________________*/
+
+			if (need_io_upper) {	/* since can't support n.e.ways */
+				pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_IO_BASE_UPPER16, 0x0000);
+				pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_IO_LIMIT_UPPER16, 0x0000);
+			}
+		} else {
+			pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_IO_BASE, 0x00);
+			pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_IO_LIMIT, 0x00);
+		}
+
+		if (bus->noMemRanges) {
+			pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_MEMORY_BASE, 0x0000 | bus->rangeMem->start >> 16);
+			pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_MEMORY_LIMIT, 0x0000 | bus->rangeMem->end >> 16);
+			
+			/* ____________________This is for debugging purposes only ________________________
+			pci_read_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_MEMORY_BASE, &temp);
+			debug ("mem_base = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
+			pci_read_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_MEMORY_LIMIT, &temp);
+			debug ("mem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
+			 __________________________________________________________________________________*/
+
+		} else {
+			pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_MEMORY_BASE, 0xffff);
+			pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_MEMORY_LIMIT, 0x0000);
+		}
+		if (bus->noPFMemRanges) {
+			pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PREF_MEMORY_BASE, 0x0000 | bus->rangePFMem->start >> 16);
+			pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PREF_MEMORY_LIMIT, 0x0000 | bus->rangePFMem->end >> 16);
+
+			/* __________________________This is for debugging purposes only _______________________
+			pci_read_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PREF_MEMORY_BASE, &temp);
+			debug ("pfmem_base = %x", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
+			pci_read_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PREF_MEMORY_LIMIT, &temp);
+			debug ("pfmem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
+			 ______________________________________________________________________________________*/
+
+			if (need_pfmem_upper) {	/* since can't support n.e.ways */
+				pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PREF_BASE_UPPER32, 0x00000000);
+				pci_write_config_dword_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PREF_LIMIT_UPPER32, 0x00000000);
+			}
+		} else {
+			pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PREF_MEMORY_BASE, 0xffff);
+			pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_PREF_MEMORY_LIMIT, 0x0000);
+		}
+
+		debug ("b4 writing control information\n");
+
+		pci_read_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_INTERRUPT_PIN, &irq);
+		if ((irq > 0x00) && (irq < 0x05))
+			pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
+		/*    
+		pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_BRIDGE_CONTROL, ctrl);
+		pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_PARITY);
+		pci_write_config_byte_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_SERR);
+		 */
+
+		pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_COMMAND, DEVICEENABLE);
+		pci_write_config_word_nodev (ibmphp_pci_root_ops, func->busno, device, function, PCI_BRIDGE_CONTROL, 0x07);
+		for (i = 0; i < 32; i++) {
+			if (amount_needed->devices[i]) {
+				debug ("device where devices[i] is 1 = %x\n", i);
+				func->devices[i] = 1;
+			}
+		}
+		func->bus = 1;	/* For unconfiguring, to indicate it's PPB */
+		func_passed = &func;
+		debug ("func->busno b4 returning is %x\n", func->busno);
+		debug ("func->busno b4 returning in the other structure is %x\n", (*func_passed)->busno);
+		kfree (amount_needed);
+		return 0;
+	} else {
+		err ("Configuring bridge was unsuccessful... \n");
+		mem_tmp = NULL;
+		retval = -EIO;
+		goto error;
+	}
+
+error:
+	if (amount_needed)
+		kfree (amount_needed);
+	if (pfmem)
+		ibmphp_remove_resource (pfmem);
+	if (io)
+		ibmphp_remove_resource (io);
+	if (mem)
+		ibmphp_remove_resource (mem);
+	for (i = 0; i < 2; i++) {	/* for 2 BARs */
+		if (bus_io[i]) {
+			ibmphp_remove_resource (bus_io[i]);
+			func->io[i] = NULL;
+		} else if (bus_pfmem[i]) {
+			ibmphp_remove_resource (bus_pfmem[i]);
+			func->pfmem[i] = NULL;
+		} else if (bus_mem[i]) {
+			ibmphp_remove_resource (bus_mem[i]);
+			func->mem[i] = NULL;
+		}
+	}
+	return retval;
+}
+
+/*****************************************************************************
+ * This function adds up the amount of resources needed behind the PPB bridge
+ * and passes it to the configure_bridge function
+ * Input: bridge function
+ * Ouput: amount of resources needed
+ *****************************************************************************/
+static struct res_needed *scan_behind_bridge (struct pci_func * func, u8 busno)
+{
+	int count, len[6];
+	u16 vendor_id;
+	u8 hdr_type;
+	u8 device, function;
+	int howmany = 0;	/*this is to see if there are any devices behind the bridge */
+
+	u32 bar[6], class;
+	u32 address[] = {
+		PCI_BASE_ADDRESS_0,
+		PCI_BASE_ADDRESS_1,
+		PCI_BASE_ADDRESS_2,
+		PCI_BASE_ADDRESS_3,
+		PCI_BASE_ADDRESS_4,
+		PCI_BASE_ADDRESS_5,
+		0
+	};
+	struct res_needed *amount;
+
+	amount = kmalloc (sizeof (struct res_needed), GFP_KERNEL);
+	if (amount == NULL)
+		return NULL;
+	memset (amount, 0, sizeof (struct res_needed));
+
+	debug ("the bus_no behind the bridge is %x\n", busno);
+	debug ("scanning devices behind the bridge...\n");
+	for (device = 0; device < 32; device++) {
+		amount->devices[device] = 0;
+		for (function = 0; function < 8; function++) {
+
+			pci_read_config_word_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_VENDOR_ID, &vendor_id);
+
+			if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
+				/* found correct device!!! */
+				howmany++;
+
+				pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_HEADER_TYPE, &hdr_type);
+				pci_read_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_CLASS_REVISION, &class);
+
+				debug ("hdr_type behind the bridge is %x\n", hdr_type);
+				if (hdr_type & PCI_HEADER_TYPE_BRIDGE) {
+					err ("embedded bridges not supported for hot-plugging.\n");
+					amount->not_correct = TRUE;
+					return amount;
+				}
+
+				class >>= 8;	/* to take revision out, class = class.subclass.prog i/f */
+				if (class == PCI_CLASS_NOT_DEFINED_VGA) {
+					err ("The device %x is VGA compatible and as is not supported for hot plugging. "
+					     "Please choose another device.\n", device);
+					amount->not_correct = TRUE;
+					return amount;
+				} else if (class == PCI_CLASS_DISPLAY_VGA) {
+					err ("The device %x is not supported for hot plugging. "
+					     "Please choose another device.\n", device);
+					amount->not_correct = TRUE;
+					return amount;
+				}
+
+				amount->devices[device] = 1;
+
+				for (count = 0; address[count]; count++) {
+					/* for 6 BARs */
+					/*
+					pci_read_config_byte_nodev(ibmphp_pci_root_ops, busno, device, function, address[count], &tmp);
+					if (tmp & 0x01) // IO
+						pci_write_config_dword_nodev(ibmphp_pci_root_ops, busno, device, function, address[count], 0xFFFFFFFD);
+					else // MEMORY
+						pci_write_config_dword_nodev(ibmphp_pci_root_ops, busno, device, function, address[count], 0xFFFFFFFF);
+					*/
+					pci_write_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, address[count], 0xFFFFFFFF);
+					pci_read_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, address[count], &bar[count]);
+
+					debug ("what is bar[count]? %x, count = %d\n", bar[count], count);
+
+					if (!bar[count])	/* This BAR is not implemented */
+						continue;
+
+					//tmp_bar = bar[count];
+
+					debug ("count %d device %x function %x wants %x resources \n", count, device, function, bar[count]);
+
+					if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
+						/* This is IO */
+						len[count] = bar[count] & 0xFFFFFFFC;
+						len[count] = ~len[count] + 1;
+						amount->io += len[count];
+					} else {
+						/* This is Memory */
+						if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
+							/* pfmem */
+							len[count] = bar[count] & 0xFFFFFFF0;
+							len[count] = ~len[count] + 1;
+							amount->pfmem += len[count];
+							if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64)
+								/* takes up another dword */
+								count += 1;
+
+						} else {
+							/* regular memory */
+							len[count] = bar[count] & 0xFFFFFFF0;
+							len[count] = ~len[count] + 1;
+							amount->mem += len[count];
+							if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
+								/* takes up another dword */
+								count += 1;
+							}
+						}
+					}
+				}	/* end for */
+			}	/* end if (valid) */
+		}	/* end for */
+	}	/* end for */
+
+	if (!howmany)
+		amount->not_correct = TRUE;
+	else
+		amount->not_correct = FALSE;
+	if ((amount->io) && (amount->io < IOBRIDGE))
+		amount->io = IOBRIDGE;
+	if ((amount->mem) && (amount->mem < MEMBRIDGE))
+		amount->mem = MEMBRIDGE;
+	if ((amount->pfmem) && (amount->pfmem < MEMBRIDGE))
+		amount->pfmem = MEMBRIDGE;
+	return amount;
+}
+
+/* The following 3 unconfigure_boot_ routines deal with the case when we had the card 
+ * upon bootup in the system, since we don't allocate func to such case, we need to read 
+ * the start addresses from pci config space and then find the corresponding entries in 
+ * our resource lists.  The functions return either 0, -ENODEV, or -1 (general failure)
+ * Change: we also call these functions even if we configured the card ourselves (i.e., not
+ * the bootup case), since it should work same way
+ */
+static int unconfigure_boot_device (u8 busno, u8 device, u8 function)
+{
+	u32 start_address;
+	u32 address[] = {
+		PCI_BASE_ADDRESS_0,
+		PCI_BASE_ADDRESS_1,
+		PCI_BASE_ADDRESS_2,
+		PCI_BASE_ADDRESS_3,
+		PCI_BASE_ADDRESS_4,
+		PCI_BASE_ADDRESS_5,
+		0
+	};
+	int count;
+	struct resource_node *io;
+	struct resource_node *mem;
+	struct resource_node *pfmem;
+	struct bus_node *bus;
+	u32 end_address;
+	u32 temp_end;
+	u32 size;
+	u32 tmp_address;
+
+	debug ("%s - enter\n", __FUNCTION__);
+
+	bus = ibmphp_find_res_bus (busno);
+	if (!bus) {
+		debug ("cannot find corresponding bus.\n");
+		return -EINVAL;
+	}
+
+	for (count = 0; address[count]; count++) {	/* for 6 BARs */
+		pci_read_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, address[count], &start_address);
+
+		/* We can do this here, b/c by that time the device driver of the card has been stopped */
+
+		pci_write_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, address[count], 0xFFFFFFFF);
+		pci_read_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, address[count], &size);
+		pci_write_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, address[count], start_address);
+
+		debug ("start_address is %x\n", start_address);
+		debug ("busno, device, function %x %x %x\n", busno, device, function);
+		if (!size) {
+			/* This BAR is not implemented */
+			debug ("is this bar no implemented?, count = %d\n", count);
+			continue;
+		}
+		tmp_address = start_address;
+		if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
+			/* This is IO */
+			start_address &= PCI_BASE_ADDRESS_IO_MASK;
+			size = size & 0xFFFFFFFC;
+			size = ~size + 1;
+			end_address = start_address + size - 1;
+			if (ibmphp_find_resource (bus, start_address, &io, IO) < 0) {
+				err ("cannot find corresponding IO resource to remove\n");
+				return -EIO;
+			}
+			debug ("io->start = %x\n", io->start);
+			temp_end = io->end;
+			start_address = io->end + 1;
+			ibmphp_remove_resource (io);
+			/* This is needed b/c of the old I/O restrictions in the BIOS */
+			while (temp_end < end_address) {
+				if (ibmphp_find_resource (bus, start_address, &io, IO) < 0) {
+					err ("cannot find corresponding IO resource to remove\n");
+					return -EIO;
+				}
+				debug ("io->start = %x\n", io->start);
+				temp_end = io->end;
+				start_address = io->end + 1;
+				ibmphp_remove_resource (io);
+			}
+
+			/* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
+		} else {
+			/* This is Memory */
+			if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
+				/* pfmem */
+				start_address &= PCI_BASE_ADDRESS_MEM_MASK;
+				debug ("start address of pfmem is %x\n", start_address);
+
+				if (ibmphp_find_resource (bus, start_address, &pfmem, PFMEM) < 0) {
+					err ("cannot find corresponding PFMEM resource to remove\n");
+					return -EIO;
+				}
+				if (pfmem)
+					debug ("pfmem->start = %x\n", pfmem->start);
+
+				ibmphp_remove_resource (pfmem);
+
+				if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
+					/* takes up another dword */
+					count += 1;
+				}
+
+			} else {
+				/* regular memory */
+				start_address &= PCI_BASE_ADDRESS_MEM_MASK;
+				debug ("start address of mem is %x\n", start_address);
+				if (ibmphp_find_resource (bus, start_address, &mem, MEM) < 0) {
+					err ("cannot find corresponding MEM resource to remove\n");
+					return -EIO;
+				}
+				if (mem)
+					debug ("mem->start = %x\n", mem->start);
+
+				ibmphp_remove_resource (mem);
+
+				if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
+					/* takes up another dword */
+					count += 1;
+				}
+			}
+		}	/* end of mem */
+	}	/* end of for */
+
+	return 0;
+}
+
+static int unconfigure_boot_bridge (u8 busno, u8 device, u8 function)
+{
+	int count;
+	int bus_no, pri_no, sub_no, sec_no = 0;
+	u32 start_address, tmp_address;
+	u8 sec_number, sub_number, pri_number;
+	struct resource_node *io = NULL;
+	struct resource_node *mem = NULL;
+	struct resource_node *pfmem = NULL;
+	struct bus_node *bus;
+	u32 address[] = {
+		PCI_BASE_ADDRESS_0,
+		PCI_BASE_ADDRESS_1,
+		0
+	};
+
+	bus_no = (int) busno;
+	debug ("busno is %x\n", busno);
+	pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_PRIMARY_BUS, &pri_number);
+	debug ("%s - busno = %x, primary_number = %x\n", __FUNCTION__, busno, pri_number);
+
+	pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_SECONDARY_BUS, &sec_number);
+	debug ("sec_number is %x\n", sec_number);
+	sec_no = (int) sec_number;
+	pri_no = (int) pri_number;
+	if (pri_no != bus_no) {
+		err ("primary numbers in our structures and pci config space don't match.\n");
+		return -EINVAL;
+	}
+
+	pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_SECONDARY_BUS, &sec_number);
+	sec_no = (int) sec_no;
+
+	pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_SUBORDINATE_BUS, &sub_number);
+	sub_no = (int) sub_number;
+	debug ("sub_no is %d, sec_no is %d\n", sub_no, sec_no);
+	if (sec_no != sub_number) {
+		err ("there're more buses behind this bridge.  Hot removal is not supported.  Please choose another card\n");
+		return -ENODEV;
+	}
+
+	bus = ibmphp_find_res_bus (sec_number);
+	debug ("bus->busno is %x\n", bus->busno);
+	debug ("sec_number is %x\n", sec_number);
+	if (!bus) {
+		err ("cannot find Bus structure for the bridged device\n");
+		return -EINVAL;
+	}
+
+	ibmphp_remove_bus (bus, busno);
+
+	for (count = 0; address[count]; count++) {
+		/* for 2 BARs */
+		pci_read_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, address[count], &start_address);
+
+		if (!start_address) {
+			/* This BAR is not implemented */
+			continue;
+		}
+
+		tmp_address = start_address;
+
+		if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
+			/* This is IO */
+			start_address &= PCI_BASE_ADDRESS_IO_MASK;
+			if (ibmphp_find_resource (bus, start_address, &io, IO) < 0) {
+				err ("cannot find corresponding IO resource to remove\n");
+				return -EIO;
+			}
+			if (io)
+				debug ("io->start = %x\n", io->start);
+
+			ibmphp_remove_resource (io);
+
+			/* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
+		} else {
+			/* This is Memory */
+			if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
+				/* pfmem */
+				start_address &= PCI_BASE_ADDRESS_MEM_MASK;
+				if (ibmphp_find_resource (bus, start_address, &pfmem, PFMEM) < 0) {
+					err ("cannot find corresponding PFMEM resource to remove\n");
+					return -EINVAL;
+				}
+				if (pfmem)
+					debug ("pfmem->start = %x\n", pfmem->start);
+
+				ibmphp_remove_resource (pfmem);
+
+				if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
+					/* takes up another dword */
+					count += 1;
+				}
+
+			} else {
+				/* regular memory */
+				start_address &= PCI_BASE_ADDRESS_MEM_MASK;
+				if (ibmphp_find_resource (bus, start_address, &mem, MEM) < 0) {
+					err ("cannot find corresponding MEM resource to remove\n");
+					return -EINVAL;
+				}
+				if (mem)
+					debug ("mem->start = %x\n", mem->start);
+
+				ibmphp_remove_resource (mem);
+
+				if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
+					/* takes up another dword */
+					count += 1;
+				}
+			}
+		}	/* end of mem */
+	}	/* end of for */
+	debug ("%s - exiting, returning success\n", __FUNCTION__);
+	return 0;
+}
+
+static int unconfigure_boot_card (struct slot *slot_cur)
+{
+	u16 vendor_id;
+	u32 class;
+	u8 hdr_type;
+	u8 device;
+	u8 busno;
+	u8 function;
+	int rc;
+	u8 valid_device = 0x00; /* To see if we are ever able to find valid device and read it */
+
+	debug ("%s - enter\n", __FUNCTION__);
+
+	device = slot_cur->device;
+	busno = slot_cur->bus;
+
+	debug ("b4 for loop, device is %x\n", device);
+	/* For every function on the card */
+	for (function = 0x0; function < 0x08; function++) {
+
+		pci_read_config_word_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_VENDOR_ID, &vendor_id);
+
+		if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
+			/* found correct device!!! */
+			++valid_device;
+
+			debug ("%s - found correct device\n", __FUNCTION__);
+
+			/* header: x x x x x x x x
+			 *         | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge
+			 *         |_=> 0 = single function device, 1 = multi-function device
+			 */
+
+			pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_HEADER_TYPE, &hdr_type);
+			pci_read_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_CLASS_REVISION, &class);
+
+			debug ("hdr_type %x, class %x\n", hdr_type, class);
+			class >>= 8;	/* to take revision out, class = class.subclass.prog i/f */
+			if (class == PCI_CLASS_NOT_DEFINED_VGA) {
+				err ("The device %x function %x is VGA compatible and is not supported for hot removing. "
+				     "Please choose another device.\n", device, function);
+				return -ENODEV;
+			} else if (class == PCI_CLASS_DISPLAY_VGA) {
+				err ("The device %x function %x is not supported for hot removing. "
+				     "Please choose another device.\n", device, function);
+				return -ENODEV;
+			}
+
+			switch (hdr_type) {
+				case PCI_HEADER_TYPE_NORMAL:
+					rc = unconfigure_boot_device (busno, device, function);
+					if (rc) {
+						err ("was not able to unconfigure device %x func %x on bus %x. bailing out... \n",
+						     device, function, busno);
+						return rc;
+					}
+					function = 0x8;
+					break;
+				case PCI_HEADER_TYPE_MULTIDEVICE:
+					rc = unconfigure_boot_device (busno, device, function);
+					if (rc) {
+						err ("was not able to unconfigure device %x func %x on bus %x. bailing out... \n",
+						     device, function, busno);
+						return rc;
+					}
+					break;
+				case PCI_HEADER_TYPE_BRIDGE:
+					class >>= 8;
+					if (class != PCI_CLASS_BRIDGE_PCI) {
+						err ("This device %x function %x is not PCI-to-PCI bridge, "
+						     "and is not supported for hot-removing. "
+						     "Please try another card.\n", device, function);
+						return -ENODEV;
+					}
+					rc = unconfigure_boot_bridge (busno, device, function);
+					if (rc != 0) {
+						err ("was not able to hot-remove PPB properly.\n");
+						return rc;
+					}
+
+					function = 0x8;
+					break;
+				case PCI_HEADER_TYPE_MULTIBRIDGE:
+					class >>= 8;
+					if (class != PCI_CLASS_BRIDGE_PCI) {
+						err ("This device %x function %x is not PCI-to-PCI bridge, "
+						     "and is not supported for hot-removing. "
+						     "Please try another card.\n", device, function);
+						return -ENODEV;
+					}
+					rc = unconfigure_boot_bridge (busno, device, function);
+					if (rc != 0) {
+						err ("was not able to hot-remove PPB properly.\n");
+						return rc;
+					}
+					break;
+				default:
+					err ("MAJOR PROBLEM!!!! Cannot read device's header \n");
+					return -1;
+					break;
+			}	/* end of switch */
+		}	/* end of valid device */
+	}	/* end of for */
+
+	if (!valid_device) {
+		err ("Could not find device to unconfigure.  Or could not read the card. \n");
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ * free the resources of the card (multi, single, or bridged)
+ * Parameters: slot, flag to say if this is for removing entire module or just
+ * unconfiguring the device
+ * TO DO:  will probably need to add some code in case there was some resource,
+ * to remove it... this is from when we have errors in the configure_card...
+ * 			!!!!!!!!!!!!!!!!!!!!!!!!!FOR BUSES!!!!!!!!!!!!
+ * Returns: 0, -1, -ENODEV 
+ */
+int ibmphp_unconfigure_card (struct slot **slot_cur, int the_end)
+{
+	int i;
+	int count;
+	int rc;
+	struct slot *sl = *slot_cur;
+	struct pci_func *cur_func = NULL;
+	struct pci_func *temp_func;
+
+	debug ("%s - enter\n", __FUNCTION__);
+
+	if (!the_end) {
+		/* Need to unconfigure the card */
+		rc = unconfigure_boot_card (sl);
+		if ((rc == -ENODEV) || (rc == -EIO) || (rc == -EINVAL)) {
+			/* In all other cases, will still need to get rid of func structure if it exists */
+			return rc;
+		}
+	}
+
+	if (sl->func) {
+		debug ("do we come in here? \n");
+		cur_func = sl->func;
+		while (cur_func) {
+			/* TO DO: WILL MOST LIKELY NEED TO GET RID OF THE BUS STRUCTURE FROM RESOURCES AS WELL */
+			if (cur_func->bus) {
+				/* in other words, it's a PPB */
+				count = 2;
+			} else {
+				count = 6;
+			}
+
+			for (i = 0; i < count; i++) {
+				if (cur_func->io[count]) {
+					debug ("io[%d] exists \n", count);
+					if (the_end > 0)
+						ibmphp_remove_resource (cur_func->io[count]);
+					cur_func->io[count] = NULL;
+				}
+				if (cur_func->mem[count]) {
+					debug ("mem[%d] exists \n", count);
+					if (the_end > 0)
+						ibmphp_remove_resource (cur_func->mem[count]);
+					cur_func->mem[count] = NULL;
+				}
+				if (cur_func->pfmem[count]) {
+					debug ("pfmem[%d] exists \n", count);
+					if (the_end > 0)
+						ibmphp_remove_resource (cur_func->pfmem[count]);
+					cur_func->pfmem[count] = NULL;
+				}
+			}
+
+			temp_func = cur_func->next;
+			kfree (cur_func);
+			cur_func = temp_func;
+		}
+	}
+
+	sl->func = NULL;
+	*slot_cur = sl;
+	return 0;
+}
+
+/*
+ * add a new bus resulting from hot-plugging a PPB bridge with devices
+ *
+ * Input: bus and the amount of resources needed (we know we can assign those,
+ *        since they've been checked already
+ * Output: bus added to the correct spot
+ *         0, -1, error 
+ */
+static int add_new_bus (struct bus_node *bus, struct resource_node *io, struct resource_node *mem, struct resource_node *pfmem, u8 parent_busno)
+{
+	struct range_node *io_range = NULL;
+	struct range_node *mem_range = NULL;
+	struct range_node *pfmem_range = NULL;
+	struct bus_node *cur_bus = NULL;
+
+	/* Trying to find the parent bus number */
+	cur_bus	= ibmphp_find_res_bus (parent_busno);
+	if (!cur_bus) {
+		err ("strange, cannot find bus which is supposed to be at the system... something is terribly wrong...\n");
+		return -ENODEV;
+	}
+
+	list_add (&bus->bus_list, &cur_bus->bus_list);
+
+	if (io) {
+		io_range = kmalloc (sizeof (struct range_node), GFP_KERNEL);
+		if (!io_range) {
+			err ("out of system memory \n");
+			return -ENOMEM;
+		}
+		memset (io_range, 0, sizeof (struct range_node));
+		io_range->start = io->start;
+		io_range->end = io->end;
+		io_range->rangeno = 1;
+		bus->noIORanges = 1;
+		bus->rangeIO = io_range;
+	}
+	if (mem) {
+		mem_range = kmalloc (sizeof (struct range_node), GFP_KERNEL);
+		if (!mem_range) {
+			err ("out of system memory \n");
+			return -ENOMEM;
+		}
+		memset (mem_range, 0, sizeof (struct range_node));
+		mem_range->start = mem->start;
+		mem_range->end = mem->end;
+		mem_range->rangeno = 1;
+		bus->noMemRanges = 1;
+		bus->rangeMem = mem_range;
+	}
+	if (pfmem) {
+		pfmem_range = kmalloc (sizeof (struct range_node), GFP_KERNEL);
+		if (!pfmem_range) {	
+			err ("out of system memory \n");
+			return -ENOMEM;
+		}
+		memset (pfmem_range, 0, sizeof (struct range_node));
+		pfmem_range->start = pfmem->start;
+		pfmem_range->end = pfmem->end;
+		pfmem_range->rangeno = 1;
+		bus->noPFMemRanges = 1;
+		bus->rangePFMem = pfmem_range;
+	}
+	return 0;
+}
+
+/*
+ * find the 1st available bus number for PPB to set as its secondary bus
+ * Parameters: bus_number of the primary bus
+ * Returns: bus_number of the secondary bus or 0xff in case of failure
+ */
+static u8 find_sec_number (u8 primary_busno, u8 slotno)
+{
+	int min, max;
+	u8 busno;
+	struct bus_info *bus;
+
+	bus = ibmphp_find_same_bus_num (primary_busno);
+	if (!bus) {
+		err ("cannot get slot range of the bus from the BIOS\n");
+		return 0xff;
+	}
+	max = bus->slot_max;
+	min = bus->slot_min;
+	if ((slotno > max) || (slotno < min)) {
+		err ("got the wrong range\n");
+		return 0xff;
+	}
+	busno = (u8) (slotno - (u8) min);
+	busno += primary_busno + 0x01;
+	if (!ibmphp_find_res_bus (busno))
+		return busno;
+	return 0xff;
+}
+

drivers/hotplug/ibmphp_res.c

+/*
+ * IBM Hot Plug Controller Driver
+ *
+ * Written By: Irene Zubarev, IBM Corporation
+ *
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (c) 2001,2002 IBM Corp.
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <gregkh@us.ibm.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/list.h>
+#include "ibmphp.h"
+
+static int flags = 0;		/* for testing */
+
+static void update_resources (struct bus_node *bus_cur, int type, int rangeno);
+static int once_over (void);
+static int remove_ranges (struct bus_node *, struct bus_node *);
+static int update_bridge_ranges (struct bus_node **);
+static int add_range (int type, struct range_node *, struct bus_node *);
+static void fix_resources (struct bus_node *);
+static inline struct bus_node *find_bus_wprev (u8, struct bus_node **, u8);
+
+static LIST_HEAD(gbuses);
+
+static struct bus_node * alloc_error_bus (struct ebda_pci_rsrc * curr)
+{
+	struct bus_node * newbus;
+
+	newbus = kmalloc (sizeof (struct bus_node), GFP_KERNEL);
+	if (!newbus) {
+		err ("out of system memory \n");
+		return NULL;
+	}
+
+	memset (newbus, 0, sizeof (struct bus_node));
+	newbus->busno = curr->bus_num;
+	list_add_tail (&newbus->bus_list, &gbuses);
+	return newbus;
+}
+
+static struct resource_node * alloc_resources (struct ebda_pci_rsrc * curr)
+{
+	struct resource_node *rs = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+	if (!rs) {
+		err ("out of system memory \n");
+		return NULL;
+	}
+	memset (rs, 0, sizeof (struct resource_node));
+	rs->busno = curr->bus_num;
+	rs->devfunc = curr->dev_fun;
+	rs->start = curr->start_addr;
+	rs->end = curr->end_addr;
+	rs->len = curr->end_addr - curr->start_addr + 1;
+	return rs;
+}
+
+static int alloc_bus_range (struct bus_node **new_bus, struct range_node **new_range, struct ebda_pci_rsrc *curr, int flag, u8 first_bus)
+{
+	struct bus_node * newbus;
+	struct range_node *newrange;
+	u8 num_ranges = 0;
+
+	if (first_bus) {
+		newbus = kmalloc (sizeof (struct bus_node), GFP_KERNEL);
+		if (!newbus) {
+			err ("out of system memory. \n");
+			return -ENOMEM;
+		}
+		memset (newbus, 0, sizeof (struct bus_node));
+		newbus->busno = curr->bus_num;
+	} else {
+		newbus = *new_bus;
+		switch (flag) {
+			case MEM:
+				num_ranges = newbus->noMemRanges;
+				break;
+			case PFMEM:
+				num_ranges = newbus->noPFMemRanges;
+				break;
+			case IO:
+				num_ranges = newbus->noIORanges;
+				break;
+		}
+	}
+
+	newrange = kmalloc (sizeof (struct range_node), GFP_KERNEL);
+	if (!newrange) {
+		if (first_bus)
+			kfree (newbus);
+		err ("out of system memory \n");
+		return -ENOMEM;
+	}
+	memset (newrange, 0, sizeof (struct range_node));
+	newrange->start = curr->start_addr;
+	newrange->end = curr->end_addr;
+		
+	if (first_bus || (!num_ranges))
+		newrange->rangeno = 1;
+	else {
+		/* need to insert our range */
+		add_range (flag, newrange, newbus);
+		debug ("%d resource Primary Bus inserted on bus %x [%x - %x]\n", flag, newbus->busno, newrange->start, newrange->end);
+	}
+
+	switch (flag) {
+		case MEM:
+			newbus->rangeMem = newrange;
+			if (first_bus)
+				newbus->noMemRanges = 1;
+			else {
+				debug ("First Memory Primary on bus %x, [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
+				++newbus->noMemRanges;
+				fix_resources (newbus);
+			}
+			break;
+		case IO:
+			newbus->rangeIO = newrange;
+			if (first_bus)
+				newbus->noIORanges = 1;
+			else {
+				debug ("First IO Primary on bus %x, [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
+				++newbus->noIORanges;
+				fix_resources (newbus);
+			}
+			break;
+		case PFMEM:
+			newbus->rangePFMem = newrange;
+			if (first_bus)
+				newbus->noPFMemRanges = 1;
+			else {	
+				debug ("1st PFMemory Primary on Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
+				++newbus->noPFMemRanges;
+				fix_resources (newbus);
+			}
+
+			break;
+	}
+
+	*new_bus = newbus;
+	*new_range = newrange;
+	return 0;
+}
+
+
+/* Notes:
+ * 1. The ranges are ordered.  The buses are not ordered.  (First come)
+ *
+ * 2. If cannot allocate out of PFMem range, allocate from Mem ranges.  PFmemFromMem
+ * are not sorted. (no need since use mem node). To not change the entire code, we
+ * also add mem node whenever this case happens so as not to change
+ * ibmphp_check_mem_resource etc (and since it really is taking Mem resource)
+ */
+
+/*****************************************************************************
+ * This is the Resource Management initialization function.  It will go through
+ * the Resource list taken from EBDA and fill in this module's data structures
+ *
+ * THIS IS NOT TAKING INTO CONSIDERATION IO RESTRICTIONS OF PRIMARY BUSES, 
+ * SINCE WE'RE GOING TO ASSUME FOR NOW WE DON'T HAVE THOSE ON OUR BUSES FOR NOW
+ *
+ * Input: ptr to the head of the resource list from EBDA
+ * Output: 0, -1 or error codes
+ ***************************************************************************/
+int ibmphp_rsrc_init (void)
+{
+	struct ebda_pci_rsrc *curr;
+	struct range_node *newrange = NULL;
+	struct bus_node *newbus = NULL;
+	struct bus_node *bus_cur;
+	struct bus_node *bus_prev;
+	struct list_head *tmp;
+	struct resource_node *new_io = NULL;
+	struct resource_node *new_mem = NULL;
+	struct resource_node *new_pfmem = NULL;
+	int rc;
+	struct list_head *tmp_ebda;
+
+	list_for_each (tmp_ebda, &ibmphp_ebda_pci_rsrc_head) {
+		curr = list_entry (tmp_ebda, struct ebda_pci_rsrc, ebda_pci_rsrc_list);
+		if (!(curr->rsrc_type & PCIDEVMASK)) {
+			/* EBDA still lists non PCI devices, so ignore... */
+			debug ("this is not a PCI DEVICE in rsrc_init, please take care\n");
+			// continue;
+		}
+
+		/* this is a primary bus resource */
+		if (curr->rsrc_type & PRIMARYBUSMASK) {
+			/* memory */
+			if ((curr->rsrc_type & RESTYPE) == MMASK) {
+				/* no bus structure exists in place yet */
+				if (list_empty (&gbuses)) {
+					if ((rc = alloc_bus_range (&newbus, &newrange, curr, MEM, 1)))
+						return rc;
+					list_add_tail (&newbus->bus_list, &gbuses);
+					debug ("gbuses = NULL, Memory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
+				} else {
+					bus_cur = find_bus_wprev (curr->bus_num, &bus_prev, 1);
+					/* found our bus */
+					if (bus_cur) {
+						rc = alloc_bus_range (&bus_cur, &newrange, curr, MEM, 0);
+						if (rc)
+							return rc;
+					} else {
+						/* went through all the buses and didn't find ours, need to create a new bus node */
+						if ((rc = alloc_bus_range (&newbus, &newrange, curr, MEM, 1)))
+							return rc;
+
+						list_add_tail (&newbus->bus_list, &gbuses);
+						debug ("New Bus, Memory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
+					}
+				}
+			} else if ((curr->rsrc_type & RESTYPE) == PFMASK) {
+				/* prefetchable memory */
+				if (list_empty (&gbuses)) {
+					/* no bus structure exists in place yet */
+					if ((rc = alloc_bus_range (&newbus, &newrange, curr, PFMEM, 1)))
+						return rc;
+					list_add_tail (&newbus->bus_list, &gbuses);
+					debug ("gbuses = NULL, PFMemory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
+				} else {
+					bus_cur = find_bus_wprev (curr->bus_num, &bus_prev, 1);
+					if (bus_cur) {
+						/* found our bus */
+						rc = alloc_bus_range (&bus_cur, &newrange, curr, PFMEM, 0);
+						if (rc)
+							return rc;
+					} else {
+						/* went through all the buses and didn't find ours, need to create a new bus node */
+						if ((rc = alloc_bus_range (&newbus, &newrange, curr, PFMEM, 1)))
+							return rc;
+						list_add_tail (&newbus->bus_list, &gbuses);
+						debug ("1st Bus, PFMemory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
+					}
+				}
+			} else if ((curr->rsrc_type & RESTYPE) == IOMASK) {
+				/* IO */
+				if (list_empty (&gbuses)) {
+					/* no bus structure exists in place yet */
+					if ((rc = alloc_bus_range (&newbus, &newrange, curr, IO, 1)))
+						return rc;
+					list_add_tail (&newbus->bus_list, &gbuses);
+					debug ("gbuses = NULL, IO Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
+				} else {
+					bus_cur = find_bus_wprev (curr->bus_num, &bus_prev, 1);
+					if (bus_cur) {
+						rc = alloc_bus_range (&bus_cur, &newrange, curr, IO, 0);
+						if (rc)
+							return rc;
+					} else {
+						/* went through all the buses and didn't find ours, need to create a new bus node */
+						if ((rc = alloc_bus_range (&newbus, &newrange, curr, IO, 1)))
+							return rc;
+						list_add_tail (&newbus->bus_list, &gbuses);
+						debug ("1st Bus, IO Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
+					}
+				}
+
+			} else {
+				;	/* type is reserved  WHAT TO DO IN THIS CASE???
+					   NOTHING TO DO??? */
+			}
+		} else {
+			/* regular pci device resource */
+			if ((curr->rsrc_type & RESTYPE) == MMASK) {
+				/* Memory resource */
+				new_mem = alloc_resources (curr);
+				if (!new_mem)
+					return -ENOMEM;
+				new_mem->type = MEM;
+				/*
+				 * if it didn't find the bus, means PCI dev
+				 * came b4 the Primary Bus info, so need to
+				 * create a bus rangeno becomes a problem...
+				 * assign a -1 and then update once the range
+				 * actually appears...
+				 */
+				if (ibmphp_add_resource (new_mem) < 0) {
+					newbus = alloc_error_bus (curr);
+					if (!newbus)
+						return -ENOMEM;
+					newbus->firstMem = new_mem;
+					++newbus->needMemUpdate;
+					new_mem->rangeno = -1;
+				}
+				debug ("Memory resource for device %x, bus %x, [%x - %x]\n", new_mem->devfunc, new_mem->busno, new_mem->start, new_mem->end);
+
+			} else if ((curr->rsrc_type & RESTYPE) == PFMASK) {
+				/* PFMemory resource */
+				new_pfmem = alloc_resources (curr);
+				if (!new_pfmem)
+					return -ENOMEM;
+				new_pfmem->type = PFMEM;
+				new_pfmem->fromMem = FALSE;
+				if (ibmphp_add_resource (new_pfmem) < 0) {
+					newbus = alloc_error_bus (curr);
+					if (!newbus)
+						return -ENOMEM;
+					newbus->firstPFMem = new_pfmem;
+					++newbus->needPFMemUpdate;
+					new_pfmem->rangeno = -1;
+				}
+
+				debug ("PFMemory resource for device %x, bus %x, [%x - %x]\n", new_pfmem->devfunc, new_pfmem->busno, new_pfmem->start, new_pfmem->end);
+			} else if ((curr->rsrc_type & RESTYPE) == IOMASK) {
+				/* IO resource */
+				new_io = alloc_resources (curr);
+				if (!new_io)
+					return -ENOMEM;
+				new_io->type = IO;
+
+				/*
+				 * if it didn't find the bus, means PCI dev
+				 * came b4 the Primary Bus info, so need to
+				 * create a bus rangeno becomes a problem...
+				 * Can assign a -1 and then update once the
+				 * range actually appears...
+				 */
+				if (ibmphp_add_resource (new_io) < 0) {
+					newbus = alloc_error_bus (curr);
+					if (!newbus)
+						return -ENOMEM;
+					newbus->firstIO = new_io;
+					++newbus->needIOUpdate;
+					new_io->rangeno = -1;
+				}
+				debug ("IO resource for device %x, bus %x, [%x - %x]\n", new_io->devfunc, new_io->busno, new_io->start, new_io->end);
+			}
+		}
+	}
+
+	debug ("after the while loop in rsrc_init \n");
+
+	list_for_each (tmp, &gbuses) {
+		bus_cur = list_entry (tmp, struct bus_node, bus_list);
+		/* This is to get info about PPB resources, since EBDA doesn't put this info into the primary bus info */
+		rc = update_bridge_ranges (&bus_cur);
+		if (rc)
+			return rc;
+	}
+	debug ("b4 once_over in rsrc_init \n");
+	rc = once_over ();  /* This is to align ranges (so no -1) */
+	if (rc)
+		return rc;
+	debug ("after once_over in rsrc_init \n");
+	return 0;
+}
+
+/********************************************************************************
+ * This function adds a range into a sorted list of ranges per bus for a particular
+ * range type, it then calls another routine to update the range numbers on the
+ * pci devices' resources for the appropriate resource
+ *
+ * Input: type of the resource, range to add, current bus
+ * Output: 0 or -1, bus and range ptrs 
+ ********************************************************************************/
+static int add_range (int type, struct range_node *range, struct bus_node *bus_cur)
+{
+	struct range_node *range_cur = NULL;
+	struct range_node *range_prev;
+	int count = 0, i_init;
+	int noRanges = 0;
+
+	switch (type) {
+		case MEM:
+			range_cur = bus_cur->rangeMem;
+			noRanges = bus_cur->noMemRanges;
+			break;
+		case PFMEM:
+			range_cur = bus_cur->rangePFMem;
+			noRanges = bus_cur->noPFMemRanges;
+			break;
+		case IO:
+			range_cur = bus_cur->rangeIO;
+			noRanges = bus_cur->noIORanges;
+			break;
+	}
+
+	range_prev = NULL;
+	while (range_cur) {
+		if (range->start < range_cur->start)
+			break;
+		range_prev = range_cur;
+		range_cur = range_cur->next;
+		count = count + 1;
+	}
+	if (!count) {
+		/* our range will go at the beginning of the list */
+		switch (type) {
+			case MEM:
+				bus_cur->rangeMem = range;
+				break;
+			case PFMEM:
+				bus_cur->rangePFMem = range;
+				break;
+			case IO:
+				bus_cur->rangeIO = range;
+				break;
+		}
+		range->next = range_cur;
+		range->rangeno = 1;
+		i_init = 0;
+	} else if (!range_cur) {
+		/* our range will go at the end of the list */
+		range->next = NULL;
+		range_prev->next = range;
+		range->rangeno = range_prev->rangeno + 1;
+		return 0;
+	} else {
+		/* the range is in the middle */
+		range_prev->next = range;
+		range->next = range_cur;
+		range->rangeno = range_cur->rangeno;
+		i_init = range_prev->rangeno;
+	}
+
+	for (count = i_init; count < noRanges; ++count) {
+		++range_cur->rangeno;
+		range_cur = range_cur->next;
+	}
+
+	update_resources (bus_cur, type, i_init + 1);
+	return 0;
+}
+
+/*******************************************************************************
+ * This routine goes through the list of resources of type 'type' and updates
+ * the range numbers that they correspond to.  It was called from add_range fnc
+ *
+ * Input: bus, type of the resource, the rangeno starting from which to update
+ ******************************************************************************/
+static void update_resources (struct bus_node *bus_cur, int type, int rangeno)
+{
+	struct resource_node *res = NULL;
+	u8 eol = FALSE;	/* end of list indicator */
+
+	switch (type) {
+		case MEM:
+			if (bus_cur->firstMem) 
+				res = bus_cur->firstMem;
+			break;
+		case PFMEM:
+			if (bus_cur->firstPFMem)
+				res = bus_cur->firstPFMem;
+			break;
+		case IO:
+			if (bus_cur->firstIO)
+				res = bus_cur->firstIO;
+			break;
+	}
+
+	if (res) {
+		while (res) {
+			if (res->rangeno == rangeno)
+				break;
+			if (res->next)
+				res = res->next;
+			else if (res->nextRange)
+				res = res->nextRange;
+			else {
+				eol = TRUE;
+				break;
+			}
+		}
+
+		if (!eol) {
+			/* found the range */
+			while (res) {
+				++res->rangeno;
+				res = res->next;
+			}
+		}
+	}
+}
+
+static void fix_me (struct resource_node *res, struct bus_node *bus_cur, struct range_node *range)
+{
+	char * str = "";
+	switch (res->type) {
+		case IO:
+			str = "io";
+			break;
+		case MEM:
+			str = "mem";
+			break;
+		case PFMEM:
+			str = "pfmem";
+			break;
+	}
+
+	while (res) {
+		if (res->rangeno == -1) {
+			while (range) {
+				if ((res->start >= range->start) && (res->end <= range->end)) {
+					res->rangeno = range->rangeno;
+					debug ("%s->rangeno in fix_resources is %d\n", str, res->rangeno);
+					switch (res->type) {
+						case IO:
+							--bus_cur->needIOUpdate;
+							break;
+						case MEM:
+							--bus_cur->needMemUpdate;
+							break;
+						case PFMEM:
+							--bus_cur->needPFMemUpdate;
+							break;
+					}
+					break;
+				}
+				range = range->next;
+			}
+		}
+		if (res->next)
+			res = res->next;
+		else
+			res = res->nextRange;
+	}
+
+}
+
+/*****************************************************************************
+ * This routine reassigns the range numbers to the resources that had a -1
+ * This case can happen only if upon initialization, resources taken by pci dev
+ * appear in EBDA before the resources allocated for that bus, since we don't
+ * know the range, we assign -1, and this routine is called after a new range
+ * is assigned to see the resources with unknown range belong to the added range
+ *
+ * Input: current bus
+ * Output: none, list of resources for that bus are fixed if can be
+ *******************************************************************************/
+static void fix_resources (struct bus_node *bus_cur)
+{
+	struct range_node *range;
+	struct resource_node *res;
+
+	debug ("%s - bus_cur->busno = %d\n", __FUNCTION__, bus_cur->busno);
+
+	if (bus_cur->needIOUpdate) {
+		res = bus_cur->firstIO;
+		range = bus_cur->rangeIO;
+		fix_me (res, bus_cur, range);
+	}
+	if (bus_cur->needMemUpdate) {
+		res = bus_cur->firstMem;
+		range = bus_cur->rangeMem;
+		fix_me (res, bus_cur, range);
+	}
+	if (bus_cur->needPFMemUpdate) {
+		res = bus_cur->firstPFMem;
+		range = bus_cur->rangePFMem;
+		fix_me (res, bus_cur, range);
+	}
+}
+
+/*******************************************************************************
+ * This routine adds a resource to the list of resources to the appropriate bus 
+ * based on their resource type and sorted by their starting addresses.  It assigns
+ * the ptrs to next and nextRange if needed.
+ *
+ * Input: 3 diff. resources (nulled out if not needed)
+ * Output: ptrs assigned (to the node)
+ * 0 or -1
+ *******************************************************************************/
+int ibmphp_add_resource (struct resource_node *res)
+{
+	struct resource_node *res_cur;
+	struct resource_node *res_prev;
+	struct bus_node *bus_cur;
+	struct range_node *range_cur = NULL;
+	struct resource_node *res_start = NULL;
+
+	debug ("%s - enter\n", __FUNCTION__);
+	
+	bus_cur = find_bus_wprev (res->busno, NULL, 0);
+	
+	if (!bus_cur) {
+		/* didn't find a bus, smth's wrong!!! */
+		err ("no bus in the system, either pci_dev's wrong or allocation failed\n");
+		return -ENODEV;
+	}
+
+	/* Normal case */
+	switch (res->type) {
+		case IO:
+			range_cur = bus_cur->rangeIO;
+			res_start = bus_cur->firstIO;
+			break;
+		case MEM:
+			range_cur = bus_cur->rangeMem;
+			res_start = bus_cur->firstMem;
+			break;
+		case PFMEM:
+			range_cur = bus_cur->rangePFMem;
+			res_start = bus_cur->firstPFMem;
+			break;
+		default:
+			err ("cannot read the type of the resource to add... problem \n");
+			return -EINVAL;
+	}
+	while (range_cur) {
+		if ((res->start >= range_cur->start) && (res->end <= range_cur->end)) {
+			res->rangeno = range_cur->rangeno;
+			break;
+		}
+		range_cur = range_cur->next;
+	}
+
+	/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	 * this is again the case of rangeno = -1
+	 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	 */
+
+	if (!range_cur) {
+		switch (res->type) {
+			case IO:
+				++bus_cur->needIOUpdate;					
+				break;
+			case MEM:
+				++bus_cur->needMemUpdate;
+				break;
+			case PFMEM:
+				++bus_cur->needPFMemUpdate;
+				break;
+		}
+		res->rangeno = -1;
+	}
+	
+	debug ("The range is %d\n", res->rangeno);
+	if (!res_start) {
+		/* no first{IO,Mem,Pfmem} on the bus, 1st IO/Mem/Pfmem resource ever */
+		switch (res->type) {
+			case IO:
+				bus_cur->firstIO = res;					
+				break;
+			case MEM:
+				bus_cur->firstMem = res;
+				break;
+			case PFMEM:
+				bus_cur->firstPFMem = res;
+				break;
+		}	
+		res->next = NULL;
+		res->nextRange = NULL;
+	} else {
+		res_cur = res_start;
+		res_prev = NULL;
+
+		debug ("res_cur->rangeno is %d\n", res_cur->rangeno);
+
+		while (res_cur) {
+			if (res_cur->rangeno >= res->rangeno)
+				break;
+			res_prev = res_cur;
+			if (res_cur->next)
+				res_cur = res_cur->next;
+			else
+				res_cur = res_cur->nextRange;
+		}
+
+		if (!res_cur) {
+			/* at the end of the resource list */
+			debug ("i should be here, [%x - %x]\n", res->start, res->end);
+			res_prev->nextRange = res;
+			res->next = NULL;
+			res->nextRange = NULL;
+		} else if (res_cur->rangeno == res->rangeno) {
+			/* in the same range */
+			while (res_cur) {
+				if (res->start < res_cur->start)
+					break;
+				res_prev = res_cur;
+				res_cur = res_cur->next;
+			}
+			if (!res_cur) {
+				/* the last resource in this range */
+				res_prev->next = res;
+				res->next = NULL;
+				res->nextRange = res_prev->nextRange;
+				res_prev->nextRange = NULL;
+			} else if (res->start < res_cur->start) {
+				/* at the beginning or middle of the range */
+				if (!res_prev)	{
+					switch (res->type) {
+						case IO:
+							bus_cur->firstIO = res;
+							break;
+						case MEM:
+							bus_cur->firstMem = res;
+							break;
+						case PFMEM:
+							bus_cur->firstPFMem = res;
+							break;
+					}
+				} else if (res_prev->rangeno == res_cur->rangeno)
+					res_prev->next = res;
+				else
+					res_prev->nextRange = res;
+
+				res->next = res_cur;
+				res->nextRange = NULL;
+			}
+		} else {
+			/* this is the case where it is 1st occurence of the range */
+			if (!res_prev) {
+				/* at the beginning of the resource list */
+				res->next = NULL;
+				switch (res->type) {
+					case IO:
+						res->nextRange = bus_cur->firstIO;
+						bus_cur->firstIO = res;
+						break;
+					case MEM:
+						res->nextRange = bus_cur->firstMem;
+						bus_cur->firstMem = res;
+						break;
+					case PFMEM:
+						res->nextRange = bus_cur->firstPFMem;
+						bus_cur->firstPFMem = res;
+						break;
+				}
+			} else if (res_cur->rangeno > res->rangeno) {
+				/* in the middle of the resource list */
+				res_prev->nextRange = res;
+				res->next = NULL;
+				res->nextRange = res_cur;
+			}
+		}
+	}
+
+	debug ("%s - exit\n", __FUNCTION__);
+	return 0;
+}
+
+/****************************************************************************
+ * This routine will remove the resource from the list of resources
+ *
+ * Input: io, mem, and/or pfmem resource to be deleted
+ * Ouput: modified resource list
+ *        0 or error code
+ ****************************************************************************/
+int ibmphp_remove_resource (struct resource_node *res)
+{
+	struct bus_node *bus_cur;
+	struct resource_node *res_cur = NULL;
+	struct resource_node *res_prev;
+	struct resource_node *mem_cur;
+	char * type = "";
+
+	bus_cur = find_bus_wprev (res->busno, NULL, 0);
+
+	if (!bus_cur) {
+		err ("cannot find corresponding bus of the io resource to remove  "
+			"bailing out...\n");
+		return -ENODEV;
+	}
+
+	switch (res->type) {
+		case IO:
+			res_cur = bus_cur->firstIO;
+			type = "io";
+			break;
+		case MEM:
+			res_cur = bus_cur->firstMem;
+			type = "mem";
+			break;
+		case PFMEM:
+			res_cur = bus_cur->firstPFMem;
+			type = "pfmem";
+			break;
+		default:
+			err ("unknown type for resource to remove \n");
+			return -EINVAL;
+	}
+	res_prev = NULL;
+
+	while (res_cur) {
+		/* ???????????DO WE _NEED_ TO BE CHECKING FOR END AS WELL?????????? */
+		if ((res_cur->start == res->start) && (res_cur->end == res->end))
+			break;
+		res_prev = res_cur;
+		if (res_cur->next)
+			res_cur = res_cur->next;
+		else
+			res_cur = res_cur->nextRange;
+	}
+
+	if (!res_cur) {
+		if (res->type == PFMEM) {
+			/* 
+			 * case where pfmem might be in the PFMemFromMem list
+			 * so will also need to remove the corresponding mem
+			 * entry
+			 */
+			res_cur = bus_cur->firstPFMemFromMem;
+			res_prev = NULL;
+
+			while (res_cur) {
+				if ((res_cur->start == res->start) && (res_cur->end == res->end)) {
+					mem_cur = bus_cur->firstMem;
+					while (mem_cur) {
+						if ((mem_cur->start == res_cur->start)
+						    && (mem_cur->end == res_cur->end))
+							break;
+						if (mem_cur->next)
+							mem_cur = mem_cur->next;
+						else
+							mem_cur = mem_cur->nextRange;
+					}
+					if (!mem_cur) {
+						err ("cannot find corresponding mem node for pfmem...\n");
+						return -EINVAL;
+					}
+
+					ibmphp_remove_resource (mem_cur);
+					if (!res_prev)
+						bus_cur->firstPFMemFromMem = res_cur->next;
+					else
+						res_prev->next = res_cur->next;
+					kfree (res_cur);
+					return 0;
+				}
+				res_prev = res_cur;
+				if (res_cur->next)
+					res_cur = res_cur->next;
+				else
+					res_cur = res_cur->nextRange;
+			}
+			if (!res_cur) {
+				err ("cannot find pfmem to delete...\n");
+				return -EINVAL;
+			}
+		} else {
+			err ("the %s resource is not in the list to be deleted...\n", type);
+			return -EINVAL;
+		}
+	}
+	if (!res_prev) {
+		/* first device to be deleted */
+		if (res_cur->next) {
+			switch (res->type) {
+				case IO:
+					bus_cur->firstIO = res_cur->next;
+					break;
+				case MEM:
+					bus_cur->firstMem = res_cur->next;
+					break;
+				case PFMEM:
+					bus_cur->firstPFMem = res_cur->next;
+					break;
+			}
+		} else if (res_cur->nextRange) {
+			switch (res->type) {
+				case IO:
+					bus_cur->firstIO = res_cur->nextRange;
+					break;
+				case MEM:
+					bus_cur->firstMem = res_cur->nextRange;
+					break;
+				case PFMEM:
+					bus_cur->firstPFMem = res_cur->nextRange;
+					break;
+			}
+		} else {
+			switch (res->type) {
+				case IO:
+					bus_cur->firstIO = NULL;
+					break;
+				case MEM:
+					bus_cur->firstMem = NULL;
+					break;
+				case PFMEM:
+					bus_cur->firstPFMem = NULL;
+					break;
+			}
+		}
+		kfree (res_cur);
+		return 0;
+	} else {
+		if (res_cur->next) {
+			if (res_prev->rangeno == res_cur->rangeno)
+				res_prev->next = res_cur->next;
+			else
+				res_prev->nextRange = res_cur->next;
+		} else if (res_cur->nextRange) {
+			res_prev->next = NULL;
+			res_prev->nextRange = res_cur->nextRange;
+		} else {
+			res_prev->next = NULL;
+			res_prev->nextRange = NULL;
+		}
+		kfree (res_cur);
+		return 0;
+	}
+
+	return 0;
+}
+
+static struct range_node * find_range (struct bus_node *bus_cur, struct resource_node * res)
+{
+	struct range_node * range = NULL;
+
+	switch (res->type) {
+		case IO:
+			range = bus_cur->rangeIO;
+			break;
+		case MEM:
+			range = bus_cur->rangeMem;
+			break;
+		case PFMEM:
+			range = bus_cur->rangePFMem;
+			break;
+		default:
+			err ("cannot read resource type in find_range \n");
+	}
+
+	while (range) {
+		if (res->rangeno == range->rangeno)
+			break;
+		range = range->next;
+	}
+	return range;
+}
+
+/*****************************************************************************
+ * This routine will check to make sure the io/mem/pfmem->len that the device asked for 
+ * can fit w/i our list of available IO/MEM/PFMEM resources.  If cannot, returns -EINVAL,
+ * otherwise, returns 0
+ *
+ * Input: resource
+ * Ouput: the correct start and end address are inputted into the resource node,
+ *        0 or -EINVAL
+ *****************************************************************************/
+int ibmphp_check_resource (struct resource_node *res, u8 bridge)
+{
+	struct bus_node *bus_cur;
+	struct range_node *range = NULL;
+	struct resource_node *res_prev;
+	struct resource_node *res_cur = NULL;
+	u32 len_cur = 0, start_cur = 0, len_tmp = 0;
+	int noranges = 0;
+	u32 tmp_start;		/* this is to make sure start address is divisible by the length needed */
+	u32 tmp_divide;
+	u8 flag = FALSE;
+
+	if (!res)
+		return -EINVAL;
+
+	if (bridge) {
+		/* The rules for bridges are different, 4K divisible for IO, 1M for (pf)mem*/
+		if (res->type == IO)
+			tmp_divide = IOBRIDGE;
+		else
+			tmp_divide = MEMBRIDGE;
+	} else
+		tmp_divide = res->len;
+
+	bus_cur = find_bus_wprev (res->busno, NULL, 0);
+
+	if (!bus_cur) {
+		/* didn't find a bus, smth's wrong!!! */
+		err ("no bus in the system, either pci_dev's wrong or allocation failed \n");
+		return -EINVAL;
+	}
+
+	debug ("%s - enter\n", __FUNCTION__);
+	debug ("bus_cur->busno is %d\n", bus_cur->busno);
+
+	/* This is a quick fix to not mess up with the code very much.  i.e.,
+	 * 2000-2fff, len = 1000, but when we compare, we need it to be fff */
+	res->len -= 1;
+
+	switch (res->type) {
+		case IO:
+			res_cur = bus_cur->firstIO;
+			noranges = bus_cur->noIORanges;
+			break;
+		case MEM:
+			res_cur = bus_cur->firstMem;
+			noranges = bus_cur->noMemRanges;
+			break;
+		case PFMEM:
+			res_cur = bus_cur->firstPFMem;
+			noranges = bus_cur->noPFMemRanges;
+			break;
+		default:
+			err ("wrong type of resource to check \n");
+			return -EINVAL;
+	}
+	res_prev = NULL;
+
+	while (res_cur) {
+		range = find_range (bus_cur, res_cur);
+		debug ("%s - rangeno = %d\n", __FUNCTION__, res_cur->rangeno);
+
+		if (!range) {
+			err ("no range for the device exists... bailing out...\n");
+			return -EINVAL;
+		}
+
+		/* found our range */
+		if (!res_prev) {
+			/* first time in the loop */
+			if ((res_cur->start != range->start) && ((len_tmp = res_cur->start - 1 - range->start) >= res->len)) {
+				debug ("len_tmp = %x\n", len_tmp);
+
+				if ((len_tmp < len_cur) || (len_cur == 0)) {
+
+					if ((range->start % tmp_divide) == 0) {
+						/* just perfect, starting address is divisible by length */
+						flag = TRUE;
+						len_cur = len_tmp;
+						start_cur = range->start;
+					} else {
+						/* Needs adjusting */
+						tmp_start = range->start;
+						flag = FALSE;
+
+						while ((len_tmp = res_cur->start - 1 - tmp_start) >= res->len) {
+							if ((tmp_start % tmp_divide) == 0) {
+								flag = TRUE;
+								len_cur = len_tmp;
+								start_cur = tmp_start;
+								break;
+							}
+							tmp_start += tmp_divide - tmp_start % tmp_divide;
+							if (tmp_start >= res_cur->start - 1)
+								break;
+						}
+					}
+			
+					if (flag && len_cur == res->len) {
+						debug ("but we are not here, right?\n");
+						res->start = start_cur;
+						res->len += 1; /* To restore the balance */
+						res->end = res->start + res->len - 1;
+						return 0;
+					}
+				}
+			}
+		}
+		if (!res_cur->next) {
+			/* last device on the range */
+			if ((range->end != res_cur->end) && ((len_tmp = range->end - (res_cur->end + 1)) >= res->len)) {
+				debug ("len_tmp = %x\n", len_tmp);
+				if ((len_tmp < len_cur) || (len_cur == 0)) {
+
+					if (((res_cur->end + 1) % tmp_divide) == 0) {
+						/* just perfect, starting address is divisible by length */
+						flag = TRUE;
+						len_cur = len_tmp;
+						start_cur = res_cur->end + 1;
+					} else {
+						/* Needs adjusting */
+						tmp_start = res_cur->end + 1;
+						flag = FALSE;
+
+						while ((len_tmp = range->end - tmp_start) >= res->len) {
+							if ((tmp_start % tmp_divide) == 0) {
+								flag = TRUE;
+								len_cur = len_tmp;
+								start_cur = tmp_start;
+								break;
+							}
+							tmp_start += tmp_divide - tmp_start % tmp_divide;
+							if (tmp_start >= range->end)
+								break;
+						}
+					}
+					if (flag && len_cur == res->len) {
+						res->start = start_cur;
+						res->len += 1; /* To restore the balance */
+						res->end = res->start + res->len - 1;
+						return 0;
+					}
+				}
+			}
+		}
+
+		if (res_prev) {
+			if (res_prev->rangeno != res_cur->rangeno) {
+				/* 1st device on this range */
+				if ((res_cur->start != range->start) && 
+					((len_tmp = res_cur->start - 1 - range->start) >= res->len)) {
+					if ((len_tmp < len_cur) || (len_cur == 0)) {
+						if ((range->start % tmp_divide) == 0) {	
+							/* just perfect, starting address is divisible by length */
+							flag = TRUE;
+							len_cur = len_tmp;
+							start_cur = range->start;
+						} else {
+							/* Needs adjusting */
+							tmp_start = range->start;
+							flag = FALSE;
+
+							while ((len_tmp = res_cur->start - 1 - tmp_start) >= res->len) {
+								if ((tmp_start % tmp_divide) == 0) {
+									flag = TRUE;
+									len_cur = len_tmp;
+									start_cur = tmp_start;
+									break;
+								}
+								tmp_start += tmp_divide - tmp_start % tmp_divide;
+								if (tmp_start >= res_cur->start - 1)
+									break;
+							}
+						}
+
+						if (flag && len_cur == res->len) {
+							res->start = start_cur;
+							res->len += 1; /* To restore the balance */
+							res->end = res->start + res->len - 1;
+							return 0;
+						}
+					}
+				}
+			} else {
+				/* in the same range */
+				if ((len_tmp = res_cur->start - 1 - res_prev->end - 1) >= res->len) {
+					if ((len_tmp < len_cur) || (len_cur == 0)) {
+						if (((res_prev->end + 1) % tmp_divide) == 0) {
+							/* just perfect, starting address's divisible by length */
+							flag = TRUE;
+							len_cur = len_tmp;
+							start_cur = res_prev->end + 1;
+						} else {
+							/* Needs adjusting */
+							tmp_start = res_prev->end + 1;
+							flag = FALSE;
+
+							while ((len_tmp = res_cur->start - 1 - tmp_start) >= res->len) {
+								if ((tmp_start % tmp_divide) == 0) {
+									flag = TRUE;
+									len_cur = len_tmp;
+									start_cur = tmp_start;
+									break;
+								}
+								tmp_start += tmp_divide - tmp_start % tmp_divide;
+								if (tmp_start >= res_cur->start - 1)
+									break;
+							}
+						}
+
+						if (flag && len_cur == res->len) {
+							res->start = start_cur;
+							res->len += 1; /* To restore the balance */
+							res->end = res->start + res->len - 1;
+							return 0;
+						}
+					}
+				}
+			}
+		}
+		/* end if (res_prev) */
+		res_prev = res_cur;
+		if (res_cur->next)
+			res_cur = res_cur->next;
+		else
+			res_cur = res_cur->nextRange;
+	}	/* end of while */
+
+
+	if (!res_prev) {
+		/* 1st device ever */
+		/* need to find appropriate range */
+		switch (res->type) {
+			case IO:
+				range = bus_cur->rangeIO;
+				break;
+			case MEM:
+				range = bus_cur->rangeMem;
+				break;
+			case PFMEM:
+				range = bus_cur->rangePFMem;
+				break;
+		}
+		while (range) {
+			if ((len_tmp = range->end - range->start) >= res->len) {
+				if ((len_tmp < len_cur) || (len_cur == 0)) {
+					if ((range->start % tmp_divide) == 0) {
+						/* just perfect, starting address's divisible by length */
+						flag = TRUE;
+						len_cur = len_tmp;
+						start_cur = range->start;
+					} else {
+						/* Needs adjusting */
+						tmp_start = range->start;
+						flag = FALSE;
+
+						while ((len_tmp = range->end - tmp_start) >= res->len) {
+							if ((tmp_start % tmp_divide) == 0) {
+								flag = TRUE;
+								len_cur = len_tmp;
+								start_cur = tmp_start;
+								break;
+							}
+							tmp_start += tmp_divide - tmp_start % tmp_divide;
+							if (tmp_start >= range->end)
+								break;
+						}
+					}
+
+					if (flag && len_cur == res->len) {
+						res->start = start_cur;
+						res->len += 1; /* To restore the balance */
+						res->end = res->start + res->len - 1;
+						return 0;
+					}
+				}
+			}
+			range = range->next;
+		}		/* end of while */
+
+		if ((!range) && (len_cur == 0)) {
+			/* have gone through the list of devices and ranges and haven't found n.e.thing */
+			err ("no appropriate range.. bailing out...\n");
+			return -EINVAL;
+		} else if (len_cur) {
+			res->start = start_cur;
+			res->len += 1; /* To restore the balance */
+			res->end = res->start + res->len - 1;
+			return 0;
+		}
+	}
+
+	if (!res_cur) {
+		debug ("prev->rangeno = %d, noranges = %d\n", res_prev->rangeno, noranges);
+		if (res_prev->rangeno < noranges) {
+			/* if there're more ranges out there to check */
+			switch (res->type) {
+				case IO:
+					range = bus_cur->rangeIO;
+					break;
+				case MEM:
+					range = bus_cur->rangeMem;
+					break;
+				case PFMEM:
+					range = bus_cur->rangePFMem;
+					break;
+			}
+			while (range) {
+				if ((len_tmp = range->end - range->start) >= res->len) {
+					if ((len_tmp < len_cur) || (len_cur == 0)) {
+						if ((range->start % tmp_divide) == 0) {
+							/* just perfect, starting address's divisible by length */
+							flag = TRUE;
+							len_cur = len_tmp;
+							start_cur = range->start;
+						} else {
+							/* Needs adjusting */
+							tmp_start = range->start;
+							flag = FALSE;
+
+							while ((len_tmp = range->end - tmp_start) >= res->len) {
+								if ((tmp_start % tmp_divide) == 0) {
+									flag = TRUE;
+									len_cur = len_tmp;
+									start_cur = tmp_start;
+									break;
+								}
+								tmp_start += tmp_divide - tmp_start % tmp_divide;
+								if (tmp_start >= range->end)
+									break;
+							}
+						}
+
+						if (flag && len_cur == res->len) {
+							res->start = start_cur;
+							res->len += 1; /* To restore the balance */
+							res->end = res->start + res->len - 1;
+							return 0;
+						}
+					}
+				}
+				range = range->next;
+			}	/* end of while */
+
+			if ((!range) && (len_cur == 0)) {
+				/* have gone through the list of devices and ranges and haven't found n.e.thing */
+				err ("no appropriate range.. bailing out...\n");
+				return -EINVAL;
+			} else if (len_cur) {
+				res->start = start_cur;
+				res->len += 1; /* To restore the balance */
+				res->end = res->start + res->len - 1;
+				return 0;
+			}
+		} else {
+			/* no more ranges to check on */
+			if (len_cur) {
+				res->start = start_cur;
+				res->len += 1; /* To restore the balance */
+				res->end = res->start + res->len - 1;
+				return 0;
+			} else {
+				/* have gone through the list of devices and haven't found n.e.thing */
+				err ("no appropriate range.. bailing out...\n");
+				return -EINVAL;
+			}
+		}
+	}	/* end if(!res_cur) */
+	return -EINVAL;
+}
+
+/********************************************************************************
+ * This routine is called from remove_card if the card contained PPB.
+ * It will remove all the resources on the bus as well as the bus itself
+ * Input: Bus
+ * Ouput: 0, -ENODEV
+ ********************************************************************************/
+int ibmphp_remove_bus (struct bus_node *bus, u8 parent_busno)
+{
+	struct resource_node *res_cur;
+	struct resource_node *res_tmp;
+	struct bus_node *prev_bus;
+	int rc;
+
+	prev_bus = find_bus_wprev (parent_busno, NULL, 0);	
+
+	if (!prev_bus) {
+		err ("something terribly wrong. Cannot find parent bus to the one to remove\n");
+		return -ENODEV;
+	}
+
+	debug ("In ibmphp_remove_bus... prev_bus->busno is %x\n", prev_bus->busno);
+
+	rc = remove_ranges (bus, prev_bus);
+	if (rc)
+		return rc;
+
+	if (bus->firstIO) {
+		res_cur = bus->firstIO;
+		while (res_cur) {
+			res_tmp = res_cur;
+			if (res_cur->next)
+				res_cur = res_cur->next;
+			else
+				res_cur = res_cur->nextRange;
+			kfree (res_tmp);
+			res_tmp = NULL;
+		}
+		bus->firstIO = NULL;
+	}
+	if (bus->firstMem) {
+		res_cur = bus->firstMem;
+		while (res_cur) {
+			res_tmp = res_cur;
+			if (res_cur->next)
+				res_cur = res_cur->next;
+			else
+				res_cur = res_cur->nextRange;
+			kfree (res_tmp);
+			res_tmp = NULL;
+		}
+		bus->firstMem = NULL;
+	}
+	if (bus->firstPFMem) {
+		res_cur = bus->firstPFMem;
+		while (res_cur) {
+			res_tmp = res_cur;
+			if (res_cur->next)
+				res_cur = res_cur->next;
+			else
+				res_cur = res_cur->nextRange;
+			kfree (res_tmp);
+			res_tmp = NULL;
+		}
+		bus->firstPFMem = NULL;
+	}
+
+	if (bus->firstPFMemFromMem) {
+		res_cur = bus->firstPFMemFromMem;
+		while (res_cur) {
+			res_tmp = res_cur;
+			res_cur = res_cur->next;
+
+			kfree (res_tmp);
+			res_tmp = NULL;
+		}
+		bus->firstPFMemFromMem = NULL;
+	}
+
+	list_del (&bus->bus_list);
+	kfree (bus);
+	return 0;
+}
+
+/******************************************************************************
+ * This routine deletes the ranges from a given bus, and the entries from the 
+ * parent's bus in the resources
+ * Input: current bus, previous bus
+ * Output: 0, -EINVAL
+ ******************************************************************************/
+static int remove_ranges (struct bus_node *bus_cur, struct bus_node *bus_prev)
+{
+	struct range_node *range_cur;
+	struct range_node *range_tmp;
+	int i;
+	struct resource_node *res = NULL;
+
+	if (bus_cur->noIORanges) {
+		range_cur = bus_cur->rangeIO;
+		for (i = 0; i < bus_cur->noIORanges; i++) {
+			if (ibmphp_find_resource (bus_prev, range_cur->start, &res, IO) < 0)
+				return -EINVAL;
+			ibmphp_remove_resource (res);
+
+			range_tmp = range_cur;
+			range_cur = range_cur->next;
+			kfree (range_tmp);
+			range_tmp = NULL;
+		}
+		bus_cur->rangeIO = NULL;
+	}
+	if (bus_cur->noMemRanges) {
+		range_cur = bus_cur->rangeMem;
+		for (i = 0; i < bus_cur->noMemRanges; i++) {
+			if (ibmphp_find_resource (bus_prev, range_cur->start, &res, MEM) < 0) 
+				return -EINVAL;
+
+			ibmphp_remove_resource (res);
+			range_tmp = range_cur;
+			range_cur = range_cur->next;
+			kfree (range_tmp);
+			range_tmp = NULL;
+		}
+		bus_cur->rangeMem = NULL;
+	}
+	if (bus_cur->noPFMemRanges) {
+		range_cur = bus_cur->rangePFMem;
+		for (i = 0; i < bus_cur->noPFMemRanges; i++) {
+			if (ibmphp_find_resource (bus_prev, range_cur->start, &res, PFMEM) < 0) 
+				return -EINVAL;
+
+			ibmphp_remove_resource (res);
+			range_tmp = range_cur;
+			range_cur = range_cur->next;
+			kfree (range_tmp);
+			range_tmp = NULL;
+		}
+		bus_cur->rangePFMem = NULL;
+	}
+	return 0;
+}
+
+/*
+ * find the resource node in the bus 
+ * Input: Resource needed, start address of the resource, type or resource
+ */
+int ibmphp_find_resource (struct bus_node *bus, u32 start_address, struct resource_node **res, int flag)
+{
+	struct resource_node *res_cur = NULL;
+	char * type = "";
+
+	switch (flag) {
+		case IO:
+			res_cur = bus->firstIO;
+			type = "io";
+			break;
+		case MEM:
+			res_cur = bus->firstMem;
+			type = "mem";
+			break;
+		case PFMEM:
+			res_cur = bus->firstPFMem;
+			type = "pfmem";
+			break;
+		default:
+			err ("wrong type of flag \n");
+			return -EINVAL;
+	}
+	
+	while (res_cur) {
+		if (res_cur->start == start_address) {
+			*res = res_cur;
+			break;
+		}
+		if (res_cur->next)
+			res_cur = res_cur->next;
+		else
+			res_cur = res_cur->nextRange;
+	}
+
+	if (!res_cur) {
+		if (flag == PFMEM) {
+			res_cur = bus->firstPFMemFromMem;
+			while (res_cur) {
+				if (res_cur->start == start_address) {
+					*res = res_cur;
+					break;
+				}
+				res_cur = res_cur->next;
+			}
+			if (!res_cur) {
+				err ("SOS...cannot find %s resource in the bus. \n", type);
+				return -EINVAL;
+			}
+		} else {
+			err ("SOS... cannot find %s resource in the bus. \n", type);
+			return -EINVAL;
+		}
+	}
+
+	if (*res)
+		debug ("*res->start = %x \n", (*res)->start);
+
+	return 0;
+}
+
+/***********************************************************************
+ * This routine will free the resource structures used by the
+ * system.  It is called from cleanup routine for the module
+ * Parameters: none
+ * Returns: none
+ ***********************************************************************/
+void ibmphp_free_resources (void)
+{
+	struct bus_node *bus_cur = NULL;
+	struct bus_node *bus_tmp;
+	struct range_node *range_cur;
+	struct range_node *range_tmp;
+	struct resource_node *res_cur;
+	struct resource_node *res_tmp;
+	struct list_head *tmp;
+	struct list_head *next;
+	int i = 0;
+	flags = 1;
+
+	list_for_each_safe (tmp, next, &gbuses) {
+		bus_cur = list_entry (tmp, struct bus_node, bus_list);
+		if (bus_cur->noIORanges) {
+			range_cur = bus_cur->rangeIO;
+			for (i = 0; i < bus_cur->noIORanges; i++) {
+				if (!range_cur)
+					break;
+				range_tmp = range_cur;
+				range_cur = range_cur->next;
+				kfree (range_tmp);
+				range_tmp = NULL;
+			}
+		}
+		if (bus_cur->noMemRanges) {
+			range_cur = bus_cur->rangeMem;
+			for (i = 0; i < bus_cur->noMemRanges; i++) {
+				if (!range_cur)
+					break;
+				range_tmp = range_cur;
+				range_cur = range_cur->next;
+				kfree (range_tmp);
+				range_tmp = NULL;
+			}
+		}
+		if (bus_cur->noPFMemRanges) {
+			range_cur = bus_cur->rangePFMem;
+			for (i = 0; i < bus_cur->noPFMemRanges; i++) {
+				if (!range_cur)
+					break;
+				range_tmp = range_cur;
+				range_cur = range_cur->next;
+				kfree (range_tmp);
+				range_tmp = NULL;
+			}
+		}
+
+		if (bus_cur->firstIO) {
+			res_cur = bus_cur->firstIO;
+			while (res_cur) {
+				res_tmp = res_cur;
+				if (res_cur->next)
+					res_cur = res_cur->next;
+				else
+					res_cur = res_cur->nextRange;
+				kfree (res_tmp);
+				res_tmp = NULL;
+			}
+			bus_cur->firstIO = NULL;
+		}
+		if (bus_cur->firstMem) {
+			res_cur = bus_cur->firstMem;
+			while (res_cur) {
+				res_tmp = res_cur;
+				if (res_cur->next)
+					res_cur = res_cur->next;
+				else
+					res_cur = res_cur->nextRange;
+				kfree (res_tmp);
+				res_tmp = NULL;
+			}
+			bus_cur->firstMem = NULL;
+		}
+		if (bus_cur->firstPFMem) {
+			res_cur = bus_cur->firstPFMem;
+			while (res_cur) {
+				res_tmp = res_cur;
+				if (res_cur->next)
+					res_cur = res_cur->next;
+				else
+					res_cur = res_cur->nextRange;
+				kfree (res_tmp);
+				res_tmp = NULL;
+			}
+			bus_cur->firstPFMem = NULL;
+		}
+
+		if (bus_cur->firstPFMemFromMem) {
+			res_cur = bus_cur->firstPFMemFromMem;
+			while (res_cur) {
+				res_tmp = res_cur;
+				res_cur = res_cur->next;
+
+				kfree (res_tmp);
+				res_tmp = NULL;
+			}
+			bus_cur->firstPFMemFromMem = NULL;
+		}
+
+		bus_tmp = bus_cur;
+		list_del (&bus_cur->bus_list);
+		kfree (bus_tmp);
+		bus_tmp = NULL;
+	}
+}
+
+/*********************************************************************************
+ * This function will go over the PFmem resources to check if the EBDA allocated
+ * pfmem out of memory buckets of the bus.  If so, it will change the range numbers
+ * and a flag to indicate that this resource is out of memory. It will also move the
+ * Pfmem out of the pfmem resource list to the PFMemFromMem list, and will create
+ * a new Mem node
+ * This routine is called right after initialization
+ *******************************************************************************/
+static int once_over (void)
+{
+	struct resource_node *pfmem_cur;
+	struct resource_node *pfmem_prev;
+	struct resource_node *mem;
+	struct bus_node *bus_cur;
+	struct list_head *tmp;
+
+	list_for_each (tmp, &gbuses) {
+		bus_cur = list_entry (tmp, struct bus_node, bus_list);
+		if ((!bus_cur->rangePFMem) && (bus_cur->firstPFMem)) {
+			for (pfmem_cur = bus_cur->firstPFMem, pfmem_prev = NULL; pfmem_cur; pfmem_prev = pfmem_cur, pfmem_cur = pfmem_cur->next) {
+				pfmem_cur->fromMem = TRUE;
+				if (pfmem_prev)
+					pfmem_prev->next = pfmem_cur->next;
+				else
+					bus_cur->firstPFMem = pfmem_cur->next;
+
+				if (!bus_cur->firstPFMemFromMem)
+					pfmem_cur->next = NULL;
+				else
+					/* we don't need to sort PFMemFromMem since we're using mem node for
+					   all the real work anyways, so just insert at the beginning of the
+					   list
+					 */
+					pfmem_cur->next = bus_cur->firstPFMemFromMem;
+
+				bus_cur->firstPFMemFromMem = pfmem_cur;
+
+				mem = kmalloc (sizeof (struct resource_node), GFP_KERNEL);		
+				if (!mem) {
+					err ("out of system memory \n");
+					return -ENOMEM;
+				}
+				memset (mem, 0, sizeof (struct resource_node));
+				mem->type = MEM;
+				mem->busno = pfmem_cur->busno;
+				mem->devfunc = pfmem_cur->devfunc;
+				mem->start = pfmem_cur->start;
+				mem->end = pfmem_cur->end;
+				mem->len = pfmem_cur->len;
+				if (ibmphp_add_resource (mem) < 0)
+					err ("Trouble...trouble... EBDA allocated pfmem from mem, but system doesn't display it has this space... unless not PCI device...\n");
+				pfmem_cur->rangeno = mem->rangeno;
+			}	/* end for pfmem */
+		}	/* end if */
+	}	/* end list_for_each bus */
+	return 0; 
+}
+
+int ibmphp_add_pfmem_from_mem (struct resource_node *pfmem)
+{
+	struct bus_node *bus_cur = find_bus_wprev (pfmem->busno, NULL, 0);
+
+	if (!bus_cur) {
+		err ("cannot find bus of pfmem to add...\n");
+		return -ENODEV;
+	}
+
+	if (bus_cur->firstPFMemFromMem)
+		pfmem->next = bus_cur->firstPFMemFromMem;
+	else
+		pfmem->next = NULL;
+
+	bus_cur->firstPFMemFromMem = pfmem;
+
+	return 0;
+}
+
+/* This routine just goes through the buses to see if the bus already exists.
+ * It is called from ibmphp_find_sec_number, to find out a secondary bus number for
+ * bridged cards
+ * Parameters: bus_number
+ * Returns: Bus pointer or NULL
+ */
+struct bus_node *ibmphp_find_res_bus (u8 bus_number)
+{
+	return find_bus_wprev (bus_number, NULL, 0);
+}
+
+static inline struct bus_node *find_bus_wprev (u8 bus_number, struct bus_node **prev, u8 flag)
+{
+	struct bus_node *bus_cur;
+	struct list_head *tmp;
+	struct list_head *tmp_prev;
+
+	list_for_each (tmp, &gbuses) {
+		tmp_prev = tmp->prev;
+		bus_cur = list_entry (tmp, struct bus_node, bus_list);
+		if (flag) 
+			*prev = list_entry (tmp_prev, struct bus_node, bus_list);
+		if (bus_cur->busno == bus_number) 
+			return bus_cur;
+	}
+
+	return NULL;
+}
+
+void ibmphp_print_test (void)
+{
+	int i = 0;
+	struct bus_node *bus_cur = NULL;
+	struct range_node *range;
+	struct resource_node *res;
+	struct list_head *tmp;
+
+	if ((!list_empty(&gbuses)) && flags) {
+		err ("The GBUSES is not NULL?!?!?!?!?\n");
+		return;
+	}
+
+	list_for_each (tmp, &gbuses) {
+		bus_cur = list_entry (tmp, struct bus_node, bus_list);
+		debug ("This is bus # %d.  There are \n", bus_cur->busno);
+		debug ("IORanges = %d\t", bus_cur->noIORanges);
+		debug ("MemRanges = %d\t", bus_cur->noMemRanges);
+		debug ("PFMemRanges = %d\n", bus_cur->noPFMemRanges);
+		debug ("The IO Ranges are as follows:\n");
+		if (bus_cur->rangeIO) {
+			range = bus_cur->rangeIO;
+			for (i = 0; i < bus_cur->noIORanges; i++) {
+				debug ("rangeno is %d\n", range->rangeno);
+				debug ("[%x - %x]\n", range->start, range->end);
+				range = range->next;
+			}
+		}
+
+		debug ("The Mem Ranges are as follows:\n");
+		if (bus_cur->rangeMem) {
+			range = bus_cur->rangeMem;
+			for (i = 0; i < bus_cur->noMemRanges; i++) {
+				debug ("rangeno is %d\n", range->rangeno);
+				debug ("[%x - %x]\n", range->start, range->end);
+				range = range->next;
+			}
+		}
+
+		debug ("The PFMem Ranges are as follows:\n");
+
+		if (bus_cur->rangePFMem) {
+			range = bus_cur->rangePFMem;
+			for (i = 0; i < bus_cur->noPFMemRanges; i++) {
+				debug ("rangeno is %d\n", range->rangeno);
+				debug ("[%x - %x]\n", range->start, range->end);
+				range = range->next;
+			}
+		}
+
+		debug ("The resources on this bus are as follows\n");
+
+		debug ("IO...\n");
+		if (bus_cur->firstIO) {
+			res = bus_cur->firstIO;
+			while (res) {
+				debug ("The range # is %d\n", res->rangeno);
+				debug ("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
+				debug ("[%x - %x], len=%x\n", res->start, res->end, res->len);
+				if (res->next)
+					res = res->next;
+				else if (res->nextRange)
+					res = res->nextRange;
+				else
+					break;
+			}
+		}
+		debug ("Mem...\n");
+		if (bus_cur->firstMem) {
+			res = bus_cur->firstMem;
+			while (res) {
+				debug ("The range # is %d\n", res->rangeno);
+				debug ("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
+				debug ("[%x - %x], len=%x\n", res->start, res->end, res->len);
+				if (res->next)
+					res = res->next;
+				else if (res->nextRange)
+					res = res->nextRange;
+				else
+					break;
+			}
+		}
+		debug ("PFMem...\n");
+		if (bus_cur->firstPFMem) {
+			res = bus_cur->firstPFMem;
+			while (res) {
+				debug ("The range # is %d\n", res->rangeno);
+				debug ("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
+				debug ("[%x - %x], len=%x\n", res->start, res->end, res->len);
+				if (res->next)
+					res = res->next;
+				else if (res->nextRange)
+					res = res->nextRange;
+				else
+					break;
+			}
+		}
+
+		debug ("PFMemFromMem...\n");
+		if (bus_cur->firstPFMemFromMem) {
+			res = bus_cur->firstPFMemFromMem;
+			while (res) {
+				debug ("The range # is %d\n", res->rangeno);
+				debug ("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
+				debug ("[%x - %x], len=%x\n", res->start, res->end, res->len);
+				res = res->next;
+			}
+		}
+	}
+}
+
+/* This routine will read the windows for any PPB we have and update the
+ * range info for the secondary bus, and will also input this info into
+ * primary bus, since BIOS doesn't. This is for PPB that are in the system
+ * on bootup
+ * Input: primary busno
+ * Returns: none
+ * Note: this function doesn't take into account IO restrictions etc,
+ *	 so will only work for bridges with no video/ISA devices behind them It
+ *	 also will not work for onboard PPB's that can have more than 1 *bus
+ *	 behind them All these are TO DO.
+ *	 Also need to add more error checkings... (from fnc returns etc)
+ */
+static int update_bridge_ranges (struct bus_node **bus)
+{
+	u8 sec_busno, device, function, busno, hdr_type, start_io_address, end_io_address;
+	u16 vendor_id, upper_io_start, upper_io_end, start_mem_address, end_mem_address;
+	u32 start_address, end_address, upper_start, upper_end;
+	struct bus_node *bus_sec;
+	struct bus_node *bus_cur;
+	struct resource_node *io;
+	struct resource_node *mem;
+	struct resource_node *pfmem;
+	struct range_node *range;
+	bus_cur = *bus;
+	busno = bus_cur->busno;
+
+	debug ("inside update_bridge_ranges \n");
+	debug ("bus_cur->busno = %x\n", bus_cur->busno);
+
+	for (device = 0; device < 32; device++) {
+		for (function = 0x00; function < 0x08; function++) {
+			pci_read_config_word_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_VENDOR_ID, &vendor_id);
+
+			if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
+				/* found correct device!!! */
+				pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_HEADER_TYPE, &hdr_type);
+
+				switch (hdr_type) {
+					case PCI_HEADER_TYPE_NORMAL:
+						function = 0x8;
+						break;
+					case PCI_HEADER_TYPE_MULTIDEVICE:
+						break;
+					case PCI_HEADER_TYPE_BRIDGE:
+						function = 0x8;
+					case PCI_HEADER_TYPE_MULTIBRIDGE:
+						/* We assume here that only 1 bus behind the bridge 
+						   TO DO: add functionality for several:
+						   temp = secondary;
+						   while (temp < subordinate) {
+						   ...
+						   temp++;
+						   }
+						 */
+						pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_SECONDARY_BUS, &sec_busno);
+						bus_sec = find_bus_wprev (sec_busno, NULL, 0); 
+						pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_IO_BASE, &start_io_address);
+						pci_read_config_byte_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_IO_LIMIT, &end_io_address);
+						pci_read_config_word_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_IO_BASE_UPPER16, &upper_io_start);
+						pci_read_config_word_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_IO_LIMIT_UPPER16, &upper_io_end);
+						start_address = (start_io_address & PCI_IO_RANGE_MASK) << 8;
+						start_address |= (upper_io_start << 16);
+						end_address = (end_io_address & PCI_IO_RANGE_MASK) << 8;
+						end_address |= (upper_io_end << 16);
+
+						if ((start_address) && (start_address <= end_address)) {
+
+							range = kmalloc (sizeof (struct range_node), GFP_KERNEL);
+
+							if (!range) {
+								err ("out of system memory \n");
+								return -ENOMEM;
+							}
+							memset (range, 0, sizeof (struct range_node));
+							range->start = start_address;
+							range->end = end_address + 0xfff;
+
+							if (bus_sec->noIORanges > 0) 
+								add_range (IO, range, bus_sec);
+							else {
+								/* 1st IO Range on the bus */
+								range->rangeno = 1;
+								bus_sec->rangeIO = range;
+							}
+
+							++bus_sec->noIORanges;
+							fix_resources (bus_sec);
+						
+							io = kmalloc (sizeof (struct resource_node), GFP_KERNEL);							
+							if (!io) {
+								kfree (range);
+								err ("out of system memory \n");
+								return -ENOMEM;
+							}
+							memset (io, 0, sizeof (struct resource_node));
+							io->type = IO;
+							io->busno = bus_cur->busno;
+							io->devfunc = ((device << 3) | (function & 0x7));
+							io->start = start_address;
+							io->end = end_address + 0xfff;
+							io->len = io->end - io->start + 1;
+
+							ibmphp_add_resource (io);
+						}
+
+						pci_read_config_word_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_MEMORY_BASE, &start_mem_address);
+						pci_read_config_word_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_MEMORY_LIMIT, &end_mem_address);
+
+						start_address = 0x00000000 | (start_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
+						end_address = 0x00000000 | (end_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
+
+						if ((start_address) && (start_address <= end_address)) {
+
+							range = kmalloc (sizeof (struct range_node), GFP_KERNEL);
+							if (!range) {
+								err ("out of system memory \n");
+								return -ENOMEM;
+							}
+							memset (range, 0, sizeof (struct range_node));
+							range->start = start_address;
+							range->end = end_address + 0xfffff;
+
+							if (bus_sec->noMemRanges > 0) 
+								add_range (MEM, range, bus_sec);
+							else {
+								/* 1st Mem Range on the bus */
+								range->rangeno = 1;
+								bus_sec->rangeMem = range;
+							}
+
+							++bus_sec->noMemRanges;
+							fix_resources (bus_sec);
+
+							mem = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+							if (!mem) {
+								kfree (range);
+								err ("out of system memory \n");
+								return -ENOMEM;
+							}
+							memset (mem, 0, sizeof (struct resource_node));
+							mem->type = MEM;
+							mem->busno = bus_cur->busno;
+							mem->devfunc = ((device << 3) | (function & 0x7));
+							mem->start = start_address;
+							mem->end = end_address + 0xfffff;
+							mem->len = mem->end - mem->start + 1;
+							ibmphp_add_resource (mem);
+						}
+						pci_read_config_word_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_PREF_MEMORY_BASE, &start_mem_address);
+						pci_read_config_word_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_PREF_MEMORY_LIMIT, &end_mem_address);
+						pci_read_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_PREF_BASE_UPPER32, &upper_start);
+						pci_read_config_dword_nodev (ibmphp_pci_root_ops, busno, device, function, PCI_PREF_LIMIT_UPPER32, &upper_end);
+						start_address = 0x00000000 | (start_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
+						end_address = 0x00000000 | (end_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
+#if BITS_PER_LONG == 64
+						start_address |= ((long) upper_start) << 32;
+						end_address |= ((long) upper_end) << 32;
+#endif
+
+						if ((start_address) && (start_address <= end_address)) {
+
+							range = kmalloc (sizeof (struct range_node), GFP_KERNEL);
+							if (!range) {
+								err ("out of system memory \n");
+								return -ENOMEM;
+							}
+							memset (range, 0, sizeof (struct range_node));
+							range->start = start_address;
+							range->end = end_address + 0xfffff;
+
+							if (bus_sec->noPFMemRanges > 0)
+								add_range (PFMEM, range, bus_sec);
+							else {
+								/* 1st PFMem Range on the bus */
+								range->rangeno = 1;
+								bus_sec->rangePFMem = range;
+							}
+
+							++bus_sec->noPFMemRanges;
+							fix_resources (bus_sec);
+
+							pfmem = kmalloc (sizeof (struct resource_node), GFP_KERNEL);
+							if (!pfmem) {
+								kfree (range);
+								err ("out of system memory \n");
+								return -ENOMEM;
+							}
+							memset (pfmem, 0, sizeof (struct resource_node));
+							pfmem->type = PFMEM;
+							pfmem->busno = bus_cur->busno;
+							pfmem->devfunc = ((device << 3) | (function & 0x7));
+							pfmem->start = start_address;
+							pfmem->end = end_address + 0xfffff;
+							pfmem->len = pfmem->end - pfmem->start + 1;
+							pfmem->fromMem = FALSE;
+							ibmphp_add_resource (pfmem);
+						}
+						break;
+				}	/* end of switch */
+			}	/* end if vendor */
+		}	/* end for function */
+	}	/* end for device */
+
+	bus = &bus_cur;
+	return 0;
+}