[PATCH] RapidIO support: ppc32

Adds PPC32 RIO support.  Init code for the MPC85xx RIO ports and glue for the
STx GP3 board to use it.
Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc/Kconfig

@@ -1257,6 +1257,14 @@ source "drivers/pci/Kconfig"
 
 source "drivers/pcmcia/Kconfig"
 
+config RAPIDIO
+	bool "RapidIO support" if MPC8540 || MPC8560
+	help
+	  If you say Y here, the kernel will include drivers and
+	  infrastructure code to support RapidIO interconnect devices.
+
+source "drivers/rapidio/Kconfig"
+
 endmenu
 
 menu "Advanced setup"

arch/ppc/configs/stx_gp3_defconfig

 #
 # Automatically generated make config: don't edit
-# Linux kernel version: 2.6.11-rc2
-# Wed Jan 26 14:32:58 2005
+# Linux kernel version: 2.6.12-rc4
+# Tue May 24 18:11:04 2005
 #
 CONFIG_MMU=y
 CONFIG_GENERIC_HARDIRQS=y
@@ -11,6 +11,7 @@ CONFIG_HAVE_DEC_LOCK=y
 CONFIG_PPC=y
 CONFIG_PPC32=y
 CONFIG_GENERIC_NVRAM=y
+CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
 
 #
 # Code maturity level options
@@ -18,6 +19,7 @@ CONFIG_GENERIC_NVRAM=y
 CONFIG_EXPERIMENTAL=y
 CONFIG_CLEAN_COMPILE=y
 CONFIG_BROKEN_ON_SMP=y
+CONFIG_INIT_ENV_ARG_LIMIT=32
 
 #
 # General setup
@@ -29,7 +31,6 @@ CONFIG_SYSVIPC=y
 # CONFIG_BSD_PROCESS_ACCT is not set
 CONFIG_SYSCTL=y
 # CONFIG_AUDIT is not set
-CONFIG_LOG_BUF_SHIFT=14
 CONFIG_HOTPLUG=y
 CONFIG_KOBJECT_UEVENT=y
 # CONFIG_IKCONFIG is not set
@@ -37,6 +38,9 @@ CONFIG_EMBEDDED=y
 CONFIG_KALLSYMS=y
 # CONFIG_KALLSYMS_ALL is not set
 # CONFIG_KALLSYMS_EXTRA_PASS is not set
+CONFIG_PRINTK=y
+CONFIG_BUG=y
+CONFIG_BASE_FULL=y
 CONFIG_FUTEX=y
 CONFIG_EPOLL=y
 # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
@@ -46,6 +50,7 @@ CONFIG_CC_ALIGN_LABELS=0
 CONFIG_CC_ALIGN_LOOPS=0
 CONFIG_CC_ALIGN_JUMPS=0
 # CONFIG_TINY_SHMEM is not set
+CONFIG_BASE_SMALL=0
 
 #
 # Loadable module support
@@ -69,9 +74,11 @@ CONFIG_KMOD=y
 CONFIG_E500=y
 CONFIG_BOOKE=y
 CONFIG_FSL_BOOKE=y
+# CONFIG_PHYS_64BIT is not set
 # CONFIG_SPE is not set
 CONFIG_MATH_EMULATION=y
 # CONFIG_CPU_FREQ is not set
+# CONFIG_PM is not set
 CONFIG_85xx=y
 CONFIG_PPC_INDIRECT_PCI_BE=y
 
@@ -96,6 +103,7 @@ CONFIG_HIGHMEM=y
 CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_MISC=m
 # CONFIG_CMDLINE_BOOL is not set
+CONFIG_ISA_DMA_API=y
 
 #
 # Bus options
@@ -104,15 +112,15 @@ CONFIG_PCI=y
 CONFIG_PCI_DOMAINS=y
 # CONFIG_PCI_LEGACY_PROC is not set
 # CONFIG_PCI_NAMES is not set
+# CONFIG_PCI_DEBUG is not set
 
 #
 # PCCARD (PCMCIA/CardBus) support
 #
 # CONFIG_PCCARD is not set
-
-#
-# PC-card bridges
-#
+CONFIG_RAPIDIO=y
+CONFIG_RAPIDIO_8_BIT_TRANSPORT=y
+CONFIG_RAPIDIO_DISC_TIMEOUT=30
 
 #
 # Advanced setup
@@ -152,7 +160,7 @@ CONFIG_PARPORT=m
 CONFIG_PARPORT_PC=m
 # CONFIG_PARPORT_PC_FIFO is not set
 # CONFIG_PARPORT_PC_SUPERIO is not set
-# CONFIG_PARPORT_OTHER is not set
+# CONFIG_PARPORT_GSC is not set
 # CONFIG_PARPORT_1284 is not set
 
 #
@@ -264,7 +272,6 @@ CONFIG_SCSI_CONSTANTS=y
 # CONFIG_SCSI_BUSLOGIC is not set
 # CONFIG_SCSI_DMX3191D is not set
 # CONFIG_SCSI_EATA is not set
-# CONFIG_SCSI_EATA_PIO is not set
 # CONFIG_SCSI_FUTURE_DOMAIN is not set
 # CONFIG_SCSI_GDTH is not set
 # CONFIG_SCSI_IPS is not set
@@ -274,7 +281,6 @@ CONFIG_SCSI_CONSTANTS=y
 # CONFIG_SCSI_IMM is not set
 # CONFIG_SCSI_SYM53C8XX_2 is not set
 # CONFIG_SCSI_IPR is not set
-# CONFIG_SCSI_QLOGIC_ISP is not set
 # CONFIG_SCSI_QLOGIC_FC is not set
 # CONFIG_SCSI_QLOGIC_1280 is not set
 CONFIG_SCSI_QLA2XXX=m
@@ -283,6 +289,7 @@ CONFIG_SCSI_QLA2XXX=m
 # CONFIG_SCSI_QLA2300 is not set
 # CONFIG_SCSI_QLA2322 is not set
 # CONFIG_SCSI_QLA6312 is not set
+# CONFIG_SCSI_LPFC is not set
 # CONFIG_SCSI_DC395x is not set
 # CONFIG_SCSI_DC390T is not set
 # CONFIG_SCSI_NSP32 is not set
@@ -322,7 +329,6 @@ CONFIG_NET=y
 #
 CONFIG_PACKET=y
 # CONFIG_PACKET_MMAP is not set
-# CONFIG_NETLINK_DEV is not set
 CONFIG_UNIX=y
 # CONFIG_NET_KEY is not set
 CONFIG_INET=y
@@ -431,7 +437,7 @@ CONFIG_IP_NF_NAT_FTP=m
 #
 # Network testing
 #
-# CONFIG_NET_PKTGEN is not set
+CONFIG_NET_PKTGEN=y
 # CONFIG_NETPOLL is not set
 # CONFIG_NET_POLL_CONTROLLER is not set
 # CONFIG_HAMRADIO is not set
@@ -499,6 +505,7 @@ CONFIG_GFAR_NAPI=y
 # Wan interfaces
 #
 # CONFIG_WAN is not set
+CONFIG_RIONET=y
 # CONFIG_FDDI is not set
 # CONFIG_HIPPI is not set
 # CONFIG_PLIP is not set
@@ -535,20 +542,6 @@ CONFIG_INPUT_JOYDEV=m
 CONFIG_INPUT_EVDEV=m
 # CONFIG_INPUT_EVBUG is not set
 
-#
-# Input I/O drivers
-#
-# CONFIG_GAMEPORT is not set
-CONFIG_SOUND_GAMEPORT=y
-CONFIG_SERIO=y
-CONFIG_SERIO_I8042=y
-CONFIG_SERIO_SERPORT=y
-# CONFIG_SERIO_CT82C710 is not set
-# CONFIG_SERIO_PARKBD is not set
-# CONFIG_SERIO_PCIPS2 is not set
-CONFIG_SERIO_LIBPS2=y
-# CONFIG_SERIO_RAW is not set
-
 #
 # Input Device Drivers
 #
@@ -566,6 +559,19 @@ CONFIG_MOUSE_PS2=y
 # CONFIG_INPUT_TOUCHSCREEN is not set
 # CONFIG_INPUT_MISC is not set
 
+#
+# Hardware I/O ports
+#
+CONFIG_SERIO=y
+CONFIG_SERIO_I8042=y
+CONFIG_SERIO_SERPORT=y
+# CONFIG_SERIO_PARKBD is not set
+# CONFIG_SERIO_PCIPS2 is not set
+CONFIG_SERIO_LIBPS2=y
+# CONFIG_SERIO_RAW is not set
+# CONFIG_GAMEPORT is not set
+CONFIG_SOUND_GAMEPORT=y
+
 #
 # Character devices
 #
@@ -590,6 +596,7 @@ CONFIG_SERIAL_CPM_SCC2=y
 # CONFIG_SERIAL_CPM_SCC4 is not set
 # CONFIG_SERIAL_CPM_SMC1 is not set
 # CONFIG_SERIAL_CPM_SMC2 is not set
+# CONFIG_SERIAL_JSM is not set
 CONFIG_UNIX98_PTYS=y
 CONFIG_LEGACY_PTYS=y
 CONFIG_LEGACY_PTY_COUNT=256
@@ -625,6 +632,11 @@ CONFIG_DRM=m
 # CONFIG_DRM_SIS is not set
 # CONFIG_RAW_DRIVER is not set
 
+#
+# TPM devices
+#
+# CONFIG_TCG_TPM is not set
+
 #
 # I2C support
 #
@@ -648,12 +660,12 @@ CONFIG_I2C_ALGOBIT=m
 # CONFIG_I2C_AMD8111 is not set
 # CONFIG_I2C_I801 is not set
 # CONFIG_I2C_I810 is not set
+# CONFIG_I2C_PIIX4 is not set
 # CONFIG_I2C_ISA is not set
 # CONFIG_I2C_MPC is not set
 # CONFIG_I2C_NFORCE2 is not set
 # CONFIG_I2C_PARPORT is not set
 # CONFIG_I2C_PARPORT_LIGHT is not set
-# CONFIG_I2C_PIIX4 is not set
 # CONFIG_I2C_PROSAVAGE is not set
 # CONFIG_I2C_SAVAGE4 is not set
 # CONFIG_SCx200_ACB is not set
@@ -677,7 +689,9 @@ CONFIG_I2C_ALGOBIT=m
 # CONFIG_SENSORS_ASB100 is not set
 # CONFIG_SENSORS_DS1621 is not set
 # CONFIG_SENSORS_FSCHER is not set
+# CONFIG_SENSORS_FSCPOS is not set
 # CONFIG_SENSORS_GL518SM is not set
+# CONFIG_SENSORS_GL520SM is not set
 # CONFIG_SENSORS_IT87 is not set
 # CONFIG_SENSORS_LM63 is not set
 # CONFIG_SENSORS_LM75 is not set
@@ -688,9 +702,11 @@ CONFIG_I2C_ALGOBIT=m
 # CONFIG_SENSORS_LM85 is not set
 # CONFIG_SENSORS_LM87 is not set
 # CONFIG_SENSORS_LM90 is not set
+# CONFIG_SENSORS_LM92 is not set
 # CONFIG_SENSORS_MAX1619 is not set
 # CONFIG_SENSORS_PC87360 is not set
 # CONFIG_SENSORS_SMSC47B397 is not set
+# CONFIG_SENSORS_SIS5595 is not set
 # CONFIG_SENSORS_SMSC47M1 is not set
 # CONFIG_SENSORS_VIA686A is not set
 # CONFIG_SENSORS_W83781D is not set
@@ -700,10 +716,12 @@ CONFIG_I2C_ALGOBIT=m
 #
 # Other I2C Chip support
 #
+# CONFIG_SENSORS_DS1337 is not set
 # CONFIG_SENSORS_EEPROM is not set
 # CONFIG_SENSORS_PCF8574 is not set
 # CONFIG_SENSORS_PCF8591 is not set
 # CONFIG_SENSORS_RTC8564 is not set
+# CONFIG_SENSORS_M41T00 is not set
 # CONFIG_I2C_DEBUG_CORE is not set
 # CONFIG_I2C_DEBUG_ALGO is not set
 # CONFIG_I2C_DEBUG_BUS is not set
@@ -732,7 +750,6 @@ CONFIG_I2C_ALGOBIT=m
 # Graphics support
 #
 # CONFIG_FB is not set
-# CONFIG_BACKLIGHT_LCD_SUPPORT is not set
 
 #
 # Sound
@@ -752,13 +769,9 @@ CONFIG_SOUND=m
 #
 # USB support
 #
-# CONFIG_USB is not set
 CONFIG_USB_ARCH_HAS_HCD=y
 CONFIG_USB_ARCH_HAS_OHCI=y
-
-#
-# NOTE: USB_STORAGE enables SCSI, and 'SCSI disk support' may also be needed; see USB_STORAGE Help for more information
-#
+# CONFIG_USB is not set
 
 #
 # USB Gadget Support
@@ -789,6 +802,10 @@ CONFIG_JBD_DEBUG=y
 CONFIG_FS_MBCACHE=y
 # CONFIG_REISERFS_FS is not set
 # CONFIG_JFS_FS is not set
+
+#
+# XFS support
+#
 # CONFIG_XFS_FS is not set
 # CONFIG_MINIX_FS is not set
 # CONFIG_ROMFS_FS is not set
@@ -859,7 +876,6 @@ CONFIG_NFS_V3=y
 CONFIG_ROOT_NFS=y
 CONFIG_LOCKD=y
 CONFIG_LOCKD_V4=y
-# CONFIG_EXPORTFS is not set
 CONFIG_SUNRPC=y
 # CONFIG_RPCSEC_GSS_KRB5 is not set
 # CONFIG_RPCSEC_GSS_SPKM3 is not set
@@ -942,8 +958,10 @@ CONFIG_ZLIB_INFLATE=m
 #
 # Kernel hacking
 #
+# CONFIG_PRINTK_TIME is not set
 CONFIG_DEBUG_KERNEL=y
 # CONFIG_MAGIC_SYSRQ is not set
+CONFIG_LOG_BUF_SHIFT=14
 # CONFIG_SCHEDSTATS is not set
 # CONFIG_DEBUG_SLAB is not set
 # CONFIG_DEBUG_SPINLOCK is not set

arch/ppc/kernel/Makefile

@@ -22,6 +22,7 @@ obj-$(CONFIG_POWER4)		+= cpu_setup_power4.o
 obj-$(CONFIG_MODULES)		+= module.o ppc_ksyms.o
 obj-$(CONFIG_NOT_COHERENT_CACHE)	+= dma-mapping.o
 obj-$(CONFIG_PCI)		+= pci.o
+obj-$(CONFIG_RAPIDIO)		+= rio.o
 obj-$(CONFIG_KGDB)		+= ppc-stub.o
 obj-$(CONFIG_SMP)		+= smp.o smp-tbsync.o
 obj-$(CONFIG_TAU)		+= temp.o

arch/ppc/kernel/rio.c

+/*
+ * RapidIO PPC32 support
+ *
+ * Copyright 2005 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/rio.h>
+
+#include <asm/rio.h>
+
+/**
+ * platform_rio_init - Do platform specific RIO init
+ *
+ * Any platform specific initialization of RapdIO
+ * hardware is done here as well as registration
+ * of any active master ports in the system.
+ */
+void __attribute__ ((weak))
+    platform_rio_init(void)
+{
+	printk(KERN_WARNING "RIO: No platform_rio_init() present\n");
+}
+
+/**
+ * ppc_rio_init - Do PPC32 RIO init
+ *
+ * Calls platform-specific RIO init code and then calls
+ * rio_init_mports() to initialize any master ports that
+ * have been registered with the RIO subsystem.
+ */
+static int __init ppc_rio_init(void)
+{
+	printk(KERN_INFO "RIO: RapidIO init\n");
+
+	/* Platform specific initialization */
+	platform_rio_init();
+
+	/* Enumerate all registered ports */
+	rio_init_mports();
+
+	return 0;
+}
+
+subsys_initcall(ppc_rio_init);

arch/ppc/platforms/85xx/mpc85xx_ads_common.c

@@ -45,6 +45,8 @@
 
 #include <mm/mmu_decl.h>
 
+#include <syslib/ppc85xx_rio.h>
+
 #include <platforms/85xx/mpc85xx_ads_common.h>
 
 #ifndef CONFIG_PCI
@@ -189,3 +191,11 @@ mpc85xx_exclude_device(u_char bus, u_char devfn)
 }
 
 #endif /* CONFIG_PCI */
+
+#ifdef CONFIG_RAPIDIO
+void platform_rio_init(void)
+{
+	/* 512MB RIO LAW at 0xc0000000 */
+	mpc85xx_rio_setup(0xc0000000, 0x20000000);
+}
+#endif /* CONFIG_RAPIDIO */

arch/ppc/platforms/85xx/stx_gp3.c

@@ -37,6 +37,7 @@
 #include <linux/module.h>
 #include <linux/fsl_devices.h>
 #include <linux/interrupt.h>
+#include <linux/rio.h>
 
 #include <asm/system.h>
 #include <asm/pgtable.h>
@@ -57,6 +58,7 @@
 
 #include <syslib/cpm2_pic.h>
 #include <syslib/ppc85xx_common.h>
+#include <syslib/ppc85xx_rio.h>
 
 
 unsigned char __res[sizeof(bd_t)];
@@ -273,6 +275,18 @@ int mpc85xx_exclude_device(u_char bus, u_char devfn)
 }
 #endif /* CONFIG_PCI */
 
+#ifdef CONFIG_RAPIDIO
+void
+platform_rio_init(void)
+{
+	/*
+	 * The STx firmware configures the RapidIO Local Access Window
+	 * at 0xc0000000 with a size of 512MB.
+	 */
+	mpc85xx_rio_setup(0xc0000000, 0x20000000);
+}
+#endif /* CONFIG_RAPIDIO */
+
 void __init
 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 	      unsigned long r6, unsigned long r7)

arch/ppc/syslib/Makefile

@@ -33,6 +33,7 @@ obj-$(CONFIG_PPC4xx_DMA)	+= ppc4xx_dma.o
 obj-$(CONFIG_PPC4xx_EDMA)	+= ppc4xx_sgdma.o
 ifeq ($(CONFIG_40x),y)
 obj-$(CONFIG_PCI)		+= pci_auto.o ppc405_pci.o
+obj-$(CONFIG_RAPIDIO)		+= ppc85xx_rio.o
 endif
 endif
 obj-$(CONFIG_8xx)		+= m8xx_setup.o ppc8xx_pic.o $(wdt-mpc8xx-y) \

arch/ppc/syslib/ppc85xx_rio.c

+/*
+ * MPC85xx RapidIO support
+ *
+ * Copyright 2005 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * 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.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/rio.h>
+#include <linux/rio_drv.h>
+
+#include <asm/io.h>
+
+#define RIO_REGS_BASE		(CCSRBAR + 0xc0000)
+#define RIO_ATMU_REGS_OFFSET	0x10c00
+#define RIO_MSG_REGS_OFFSET	0x11000
+#define RIO_MAINT_WIN_SIZE	0x400000
+#define RIO_DBELL_WIN_SIZE	0x1000
+
+#define RIO_MSG_OMR_MUI		0x00000002
+#define RIO_MSG_OSR_TE		0x00000080
+#define RIO_MSG_OSR_QOI		0x00000020
+#define RIO_MSG_OSR_QFI		0x00000010
+#define RIO_MSG_OSR_MUB		0x00000004
+#define RIO_MSG_OSR_EOMI	0x00000002
+#define RIO_MSG_OSR_QEI		0x00000001
+
+#define RIO_MSG_IMR_MI		0x00000002
+#define RIO_MSG_ISR_TE		0x00000080
+#define RIO_MSG_ISR_QFI		0x00000010
+#define RIO_MSG_ISR_DIQI	0x00000001
+
+#define RIO_MSG_DESC_SIZE	32
+#define RIO_MSG_BUFFER_SIZE	4096
+#define RIO_MIN_TX_RING_SIZE	2
+#define RIO_MAX_TX_RING_SIZE	2048
+#define RIO_MIN_RX_RING_SIZE	2
+#define RIO_MAX_RX_RING_SIZE	2048
+
+#define DOORBELL_DMR_DI		0x00000002
+#define DOORBELL_DSR_TE		0x00000080
+#define DOORBELL_DSR_QFI	0x00000010
+#define DOORBELL_DSR_DIQI	0x00000001
+#define DOORBELL_TID_OFFSET	0x03
+#define DOORBELL_SID_OFFSET	0x05
+#define DOORBELL_INFO_OFFSET	0x06
+
+#define DOORBELL_MESSAGE_SIZE	0x08
+#define DBELL_SID(x)		(*(u8 *)(x + DOORBELL_SID_OFFSET))
+#define DBELL_TID(x)		(*(u8 *)(x + DOORBELL_TID_OFFSET))
+#define DBELL_INF(x)		(*(u16 *)(x + DOORBELL_INFO_OFFSET))
+
+#define is_power_of_2(x)	(((x) & ((x) - 1)) == 0)
+
+struct rio_atmu_regs {
+	u32 rowtar;
+	u32 pad1;
+	u32 rowbar;
+	u32 pad2;
+	u32 rowar;
+	u32 pad3[3];
+};
+
+struct rio_msg_regs {
+	u32 omr;
+	u32 osr;
+	u32 pad1;
+	u32 odqdpar;
+	u32 pad2;
+	u32 osar;
+	u32 odpr;
+	u32 odatr;
+	u32 odcr;
+	u32 pad3;
+	u32 odqepar;
+	u32 pad4[13];
+	u32 imr;
+	u32 isr;
+	u32 pad5;
+	u32 ifqdpar;
+	u32 pad6;
+	u32 ifqepar;
+	u32 pad7[250];
+	u32 dmr;
+	u32 dsr;
+	u32 pad8;
+	u32 dqdpar;
+	u32 pad9;
+	u32 dqepar;
+	u32 pad10[26];
+	u32 pwmr;
+	u32 pwsr;
+	u32 pad11;
+	u32 pwqbar;
+};
+
+struct rio_tx_desc {
+	u32 res1;
+	u32 saddr;
+	u32 dport;
+	u32 dattr;
+	u32 res2;
+	u32 res3;
+	u32 dwcnt;
+	u32 res4;
+};
+
+static u32 regs_win;
+static struct rio_atmu_regs *atmu_regs;
+static struct rio_atmu_regs *maint_atmu_regs;
+static struct rio_atmu_regs *dbell_atmu_regs;
+static u32 dbell_win;
+static u32 maint_win;
+static struct rio_msg_regs *msg_regs;
+
+static struct rio_dbell_ring {
+	void *virt;
+	dma_addr_t phys;
+} dbell_ring;
+
+static struct rio_msg_tx_ring {
+	void *virt;
+	dma_addr_t phys;
+	void *virt_buffer[RIO_MAX_TX_RING_SIZE];
+	dma_addr_t phys_buffer[RIO_MAX_TX_RING_SIZE];
+	int tx_slot;
+	int size;
+} msg_tx_ring;
+
+static struct rio_msg_rx_ring {
+	void *virt;
+	dma_addr_t phys;
+	void *virt_buffer[RIO_MAX_RX_RING_SIZE];
+	int rx_slot;
+	int size;
+} msg_rx_ring;
+
+/**
+ * mpc85xx_rio_doorbell_send - Send a MPC85xx doorbell message
+ * @index: ID of RapidIO interface
+ * @destid: Destination ID of target device
+ * @data: 16-bit info field of RapidIO doorbell message
+ *
+ * Sends a MPC85xx doorbell message. Returns %0 on success or
+ * %-EINVAL on failure.
+ */
+static int mpc85xx_rio_doorbell_send(int index, u16 destid, u16 data)
+{
+	pr_debug("mpc85xx_doorbell_send: index %d destid %4.4x data %4.4x\n",
+		 index, destid, data);
+	out_be32((void *)&dbell_atmu_regs->rowtar, destid << 22);
+	out_be16((void *)(dbell_win), data);
+
+	return 0;
+}
+
+/**
+ * mpc85xx_local_config_read - Generate a MPC85xx local config space read
+ * @index: ID of RapdiIO interface
+ * @offset: Offset into configuration space
+ * @len: Length (in bytes) of the maintenance transaction
+ * @data: Value to be read into
+ *
+ * Generates a MPC85xx local configuration space read. Returns %0 on
+ * success or %-EINVAL on failure.
+ */
+static int mpc85xx_local_config_read(int index, u32 offset, int len, u32 * data)
+{
+	pr_debug("mpc85xx_local_config_read: index %d offset %8.8x\n", index,
+		 offset);
+	*data = in_be32((void *)(regs_win + offset));
+
+	return 0;
+}
+
+/**
+ * mpc85xx_local_config_write - Generate a MPC85xx local config space write
+ * @index: ID of RapdiIO interface
+ * @offset: Offset into configuration space
+ * @len: Length (in bytes) of the maintenance transaction
+ * @data: Value to be written
+ *
+ * Generates a MPC85xx local configuration space write. Returns %0 on
+ * success or %-EINVAL on failure.
+ */
+static int mpc85xx_local_config_write(int index, u32 offset, int len, u32 data)
+{
+	pr_debug
+	    ("mpc85xx_local_config_write: index %d offset %8.8x data %8.8x\n",
+	     index, offset, data);
+	out_be32((void *)(regs_win + offset), data);
+
+	return 0;
+}
+
+/**
+ * mpc85xx_rio_config_read - Generate a MPC85xx read maintenance transaction
+ * @index: ID of RapdiIO interface
+ * @destid: Destination ID of transaction
+ * @hopcount: Number of hops to target device
+ * @offset: Offset into configuration space
+ * @len: Length (in bytes) of the maintenance transaction
+ * @val: Location to be read into
+ *
+ * Generates a MPC85xx read maintenance transaction. Returns %0 on
+ * success or %-EINVAL on failure.
+ */
+static int
+mpc85xx_rio_config_read(int index, u16 destid, u8 hopcount, u32 offset, int len,
+			u32 * val)
+{
+	u8 *data;
+
+	pr_debug
+	    ("mpc85xx_rio_config_read: index %d destid %d hopcount %d offset %8.8x len %d\n",
+	     index, destid, hopcount, offset, len);
+	out_be32((void *)&maint_atmu_regs->rowtar,
+		 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
+
+	data = (u8 *) maint_win + offset;
+	switch (len) {
+	case 1:
+		*val = in_8((u8 *) data);
+		break;
+	case 2:
+		*val = in_be16((u16 *) data);
+		break;
+	default:
+		*val = in_be32((u32 *) data);
+		break;
+	}
+
+	return 0;
+}
+
+/**
+ * mpc85xx_rio_config_write - Generate a MPC85xx write maintenance transaction
+ * @index: ID of RapdiIO interface
+ * @destid: Destination ID of transaction
+ * @hopcount: Number of hops to target device
+ * @offset: Offset into configuration space
+ * @len: Length (in bytes) of the maintenance transaction
+ * @val: Value to be written
+ *
+ * Generates an MPC85xx write maintenance transaction. Returns %0 on
+ * success or %-EINVAL on failure.
+ */
+static int
+mpc85xx_rio_config_write(int index, u16 destid, u8 hopcount, u32 offset,
+			 int len, u32 val)
+{
+	u8 *data;
+	pr_debug
+	    ("mpc85xx_rio_config_write: index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n",
+	     index, destid, hopcount, offset, len, val);
+	out_be32((void *)&maint_atmu_regs->rowtar,
+		 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
+
+	data = (u8 *) maint_win + offset;
+	switch (len) {
+	case 1:
+		out_8((u8 *) data, val);
+		break;
+	case 2:
+		out_be16((u16 *) data, val);
+		break;
+	default:
+		out_be32((u32 *) data, val);
+		break;
+	}
+
+	return 0;
+}
+
+/**
+ * rio_hw_add_outb_message - Add message to the MPC85xx outbound message queue
+ * @mport: Master port with outbound message queue
+ * @rdev: Target of outbound message
+ * @mbox: Outbound mailbox
+ * @buffer: Message to add to outbound queue
+ * @len: Length of message
+ *
+ * Adds the @buffer message to the MPC85xx outbound message queue. Returns
+ * %0 on success or %-EINVAL on failure.
+ */
+int
+rio_hw_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
+			void *buffer, size_t len)
+{
+	u32 omr;
+	struct rio_tx_desc *desc =
+	    (struct rio_tx_desc *)msg_tx_ring.virt + msg_tx_ring.tx_slot;
+	int ret = 0;
+
+	pr_debug
+	    ("RIO: rio_hw_add_outb_message(): destid %4.4x mbox %d buffer %8.8x len %8.8x\n",
+	     rdev->destid, mbox, (int)buffer, len);
+
+	if ((len < 8) || (len > RIO_MAX_MSG_SIZE)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Copy and clear rest of buffer */
+	memcpy(msg_tx_ring.virt_buffer[msg_tx_ring.tx_slot], buffer, len);
+	if (len < (RIO_MAX_MSG_SIZE - 4))
+		memset((void *)((u32) msg_tx_ring.
+				virt_buffer[msg_tx_ring.tx_slot] + len), 0,
+		       RIO_MAX_MSG_SIZE - len);
+
+	/* Set mbox field for message */
+	desc->dport = mbox & 0x3;
+
+	/* Enable EOMI interrupt, set priority, and set destid */
+	desc->dattr = 0x28000000 | (rdev->destid << 2);
+
+	/* Set transfer size aligned to next power of 2 (in double words) */
+	desc->dwcnt = is_power_of_2(len) ? len : 1 << get_bitmask_order(len);
+
+	/* Set snooping and source buffer address */
+	desc->saddr = 0x00000004 | msg_tx_ring.phys_buffer[msg_tx_ring.tx_slot];
+
+	/* Increment enqueue pointer */
+	omr = in_be32((void *)&msg_regs->omr);
+	out_be32((void *)&msg_regs->omr, omr | RIO_MSG_OMR_MUI);
+
+	/* Go to next descriptor */
+	if (++msg_tx_ring.tx_slot == msg_tx_ring.size)
+		msg_tx_ring.tx_slot = 0;
+
+      out:
+	return ret;
+}
+
+EXPORT_SYMBOL_GPL(rio_hw_add_outb_message);
+
+/**
+ * mpc85xx_rio_tx_handler - MPC85xx outbound message interrupt handler
+ * @irq: Linux interrupt number
+ * @dev_instance: Pointer to interrupt-specific data
+ * @regs: Register context
+ *
+ * Handles outbound message interrupts. Executes a register outbound
+ * mailbox event handler and acks the interrupt occurence.
+ */
+static irqreturn_t
+mpc85xx_rio_tx_handler(int irq, void *dev_instance, struct pt_regs *regs)
+{
+	int osr;
+	struct rio_mport *port = (struct rio_mport *)dev_instance;
+
+	osr = in_be32((void *)&msg_regs->osr);
+
+	if (osr & RIO_MSG_OSR_TE) {
+		pr_info("RIO: outbound message transmission error\n");
+		out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_TE);
+		goto out;
+	}
+
+	if (osr & RIO_MSG_OSR_QOI) {
+		pr_info("RIO: outbound message queue overflow\n");
+		out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_QOI);
+		goto out;
+	}
+
+	if (osr & RIO_MSG_OSR_EOMI) {
+		u32 dqp = in_be32((void *)&msg_regs->odqdpar);
+		int slot = (dqp - msg_tx_ring.phys) >> 5;
+		port->outb_msg[0].mcback(port, -1, slot);
+
+		/* Ack the end-of-message interrupt */
+		out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_EOMI);
+	}
+
+      out:
+	return IRQ_HANDLED;
+}
+
+/**
+ * rio_open_outb_mbox - Initialize MPC85xx outbound mailbox
+ * @mport: Master port implementing the outbound message unit
+ * @mbox: Mailbox to open
+ * @entries: Number of entries in the outbound mailbox ring
+ *
+ * Initializes buffer ring, request the outbound message interrupt,
+ * and enables the outbound message unit. Returns %0 on success and
+ * %-EINVAL or %-ENOMEM on failure.
+ */
+int rio_open_outb_mbox(struct rio_mport *mport, int mbox, int entries)
+{
+	int i, j, rc = 0;
+
+	if ((entries < RIO_MIN_TX_RING_SIZE) ||
+	    (entries > RIO_MAX_TX_RING_SIZE) || (!is_power_of_2(entries))) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* Initialize shadow copy ring */
+	msg_tx_ring.size = entries;
+
+	for (i = 0; i < msg_tx_ring.size; i++) {
+		if (!
+		    (msg_tx_ring.virt_buffer[i] =
+		     dma_alloc_coherent(NULL, RIO_MSG_BUFFER_SIZE,
+					&msg_tx_ring.phys_buffer[i],
+					GFP_KERNEL))) {
+			rc = -ENOMEM;
+			for (j = 0; j < msg_tx_ring.size; j++)
+				if (msg_tx_ring.virt_buffer[j])
+					dma_free_coherent(NULL,
+							  RIO_MSG_BUFFER_SIZE,
+							  msg_tx_ring.
+							  virt_buffer[j],
+							  msg_tx_ring.
+							  phys_buffer[j]);
+			goto out;
+		}
+	}
+
+	/* Initialize outbound message descriptor ring */
+	if (!(msg_tx_ring.virt = dma_alloc_coherent(NULL,
+						    msg_tx_ring.size *
+						    RIO_MSG_DESC_SIZE,
+						    &msg_tx_ring.phys,
+						    GFP_KERNEL))) {
+		rc = -ENOMEM;
+		goto out_dma;
+	}
+	memset(msg_tx_ring.virt, 0, msg_tx_ring.size * RIO_MSG_DESC_SIZE);
+	msg_tx_ring.tx_slot = 0;
+
+	/* Point dequeue/enqueue pointers at first entry in ring */
+	out_be32((void *)&msg_regs->odqdpar, msg_tx_ring.phys);
+	out_be32((void *)&msg_regs->odqepar, msg_tx_ring.phys);
+
+	/* Configure for snooping */
+	out_be32((void *)&msg_regs->osar, 0x00000004);
+
+	/* Clear interrupt status */
+	out_be32((void *)&msg_regs->osr, 0x000000b3);
+
+	/* Hook up outbound message handler */
+	if ((rc =
+	     request_irq(MPC85xx_IRQ_RIO_TX, mpc85xx_rio_tx_handler, 0,
+			 "msg_tx", (void *)mport)) < 0)
+		goto out_irq;
+
+	/*
+	 * Configure outbound message unit
+	 *      Snooping
+	 *      Interrupts (all enabled, except QEIE)
+	 *      Chaining mode
+	 *      Disable
+	 */
+	out_be32((void *)&msg_regs->omr, 0x00100220);
+
+	/* Set number of entries */
+	out_be32((void *)&msg_regs->omr,
+		 in_be32((void *)&msg_regs->omr) |
+		 ((get_bitmask_order(entries) - 2) << 12));
+
+	/* Now enable the unit */
+	out_be32((void *)&msg_regs->omr, in_be32((void *)&msg_regs->omr) | 0x1);
+
+      out:
+	return rc;
+
+      out_irq:
+	dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE,
+			  msg_tx_ring.virt, msg_tx_ring.phys);
+
+      out_dma:
+	for (i = 0; i < msg_tx_ring.size; i++)
+		dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE,
+				  msg_tx_ring.virt_buffer[i],
+				  msg_tx_ring.phys_buffer[i]);
+
+	return rc;
+}
+
+/**
+ * rio_close_outb_mbox - Shut down MPC85xx outbound mailbox
+ * @mport: Master port implementing the outbound message unit
+ * @mbox: Mailbox to close
+ *
+ * Disables the outbound message unit, free all buffers, and
+ * frees the outbound message interrupt.
+ */
+void rio_close_outb_mbox(struct rio_mport *mport, int mbox)
+{
+	/* Disable inbound message unit */
+	out_be32((void *)&msg_regs->omr, 0);
+
+	/* Free ring */
+	dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE,
+			  msg_tx_ring.virt, msg_tx_ring.phys);
+
+	/* Free interrupt */
+	free_irq(MPC85xx_IRQ_RIO_TX, (void *)mport);
+}
+
+/**
+ * mpc85xx_rio_rx_handler - MPC85xx inbound message interrupt handler
+ * @irq: Linux interrupt number
+ * @dev_instance: Pointer to interrupt-specific data
+ * @regs: Register context
+ *
+ * Handles inbound message interrupts. Executes a registered inbound
+ * mailbox event handler and acks the interrupt occurence.
+ */
+static irqreturn_t
+mpc85xx_rio_rx_handler(int irq, void *dev_instance, struct pt_regs *regs)
+{
+	int isr;
+	struct rio_mport *port = (struct rio_mport *)dev_instance;
+
+	isr = in_be32((void *)&msg_regs->isr);
+
+	if (isr & RIO_MSG_ISR_TE) {
+		pr_info("RIO: inbound message reception error\n");
+		out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_TE);
+		goto out;
+	}
+
+	/* XXX Need to check/dispatch until queue empty */
+	if (isr & RIO_MSG_ISR_DIQI) {
+		/*
+		 * We implement *only* mailbox 0, but can receive messages
+		 * for any mailbox/letter to that mailbox destination. So,
+		 * make the callback with an unknown/invalid mailbox number
+		 * argument.
+		 */
+		port->inb_msg[0].mcback(port, -1, -1);
+
+		/* Ack the queueing interrupt */
+		out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_DIQI);
+	}
+
+      out:
+	return IRQ_HANDLED;
+}
+
+/**
+ * rio_open_inb_mbox - Initialize MPC85xx inbound mailbox
+ * @mport: Master port implementing the inbound message unit
+ * @mbox: Mailbox to open
+ * @entries: Number of entries in the inbound mailbox ring
+ *
+ * Initializes buffer ring, request the inbound message interrupt,
+ * and enables the inbound message unit. Returns %0 on success
+ * and %-EINVAL or %-ENOMEM on failure.
+ */
+int rio_open_inb_mbox(struct rio_mport *mport, int mbox, int entries)
+{
+	int i, rc = 0;
+
+	if ((entries < RIO_MIN_RX_RING_SIZE) ||
+	    (entries > RIO_MAX_RX_RING_SIZE) || (!is_power_of_2(entries))) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* Initialize client buffer ring */
+	msg_rx_ring.size = entries;
+	msg_rx_ring.rx_slot = 0;
+	for (i = 0; i < msg_rx_ring.size; i++)
+		msg_rx_ring.virt_buffer[i] = NULL;
+
+	/* Initialize inbound message ring */
+	if (!(msg_rx_ring.virt = dma_alloc_coherent(NULL,
+						    msg_rx_ring.size *
+						    RIO_MAX_MSG_SIZE,
+						    &msg_rx_ring.phys,
+						    GFP_KERNEL))) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	/* Point dequeue/enqueue pointers at first entry in ring */
+	out_be32((void *)&msg_regs->ifqdpar, (u32) msg_rx_ring.phys);
+	out_be32((void *)&msg_regs->ifqepar, (u32) msg_rx_ring.phys);
+
+	/* Clear interrupt status */
+	out_be32((void *)&msg_regs->isr, 0x00000091);
+
+	/* Hook up inbound message handler */
+	if ((rc =
+	     request_irq(MPC85xx_IRQ_RIO_RX, mpc85xx_rio_rx_handler, 0,
+			 "msg_rx", (void *)mport)) < 0) {
+		dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE,
+				  msg_tx_ring.virt_buffer[i],
+				  msg_tx_ring.phys_buffer[i]);
+		goto out;
+	}
+
+	/*
+	 * Configure inbound message unit:
+	 *      Snooping
+	 *      4KB max message size
+	 *      Unmask all interrupt sources
+	 *      Disable
+	 */
+	out_be32((void *)&msg_regs->imr, 0x001b0060);
+
+	/* Set number of queue entries */
+	out_be32((void *)&msg_regs->imr,
+		 in_be32((void *)&msg_regs->imr) |
+		 ((get_bitmask_order(entries) - 2) << 12));
+
+	/* Now enable the unit */
+	out_be32((void *)&msg_regs->imr, in_be32((void *)&msg_regs->imr) | 0x1);
+
+      out:
+	return rc;
+}
+
+/**
+ * rio_close_inb_mbox - Shut down MPC85xx inbound mailbox
+ * @mport: Master port implementing the inbound message unit
+ * @mbox: Mailbox to close
+ *
+ * Disables the inbound message unit, free all buffers, and
+ * frees the inbound message interrupt.
+ */
+void rio_close_inb_mbox(struct rio_mport *mport, int mbox)
+{
+	/* Disable inbound message unit */
+	out_be32((void *)&msg_regs->imr, 0);
+
+	/* Free ring */
+	dma_free_coherent(NULL, msg_rx_ring.size * RIO_MAX_MSG_SIZE,
+			  msg_rx_ring.virt, msg_rx_ring.phys);
+
+	/* Free interrupt */
+	free_irq(MPC85xx_IRQ_RIO_RX, (void *)mport);
+}
+
+/**
+ * rio_hw_add_inb_buffer - Add buffer to the MPC85xx inbound message queue
+ * @mport: Master port implementing the inbound message unit
+ * @mbox: Inbound mailbox number
+ * @buf: Buffer to add to inbound queue
+ *
+ * Adds the @buf buffer to the MPC85xx inbound message queue. Returns
+ * %0 on success or %-EINVAL on failure.
+ */
+int rio_hw_add_inb_buffer(struct rio_mport *mport, int mbox, void *buf)
+{
+	int rc = 0;
+
+	pr_debug("RIO: rio_hw_add_inb_buffer(), msg_rx_ring.rx_slot %d\n",
+		 msg_rx_ring.rx_slot);
+
+	if (msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot]) {
+		printk(KERN_ERR
+		       "RIO: error adding inbound buffer %d, buffer exists\n",
+		       msg_rx_ring.rx_slot);
+		rc = -EINVAL;
+		goto out;
+	}
+
+	msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot] = buf;
+	if (++msg_rx_ring.rx_slot == msg_rx_ring.size)
+		msg_rx_ring.rx_slot = 0;
+
+      out:
+	return rc;
+}
+
+EXPORT_SYMBOL_GPL(rio_hw_add_inb_buffer);
+
+/**
+ * rio_hw_get_inb_message - Fetch inbound message from the MPC85xx message unit
+ * @mport: Master port implementing the inbound message unit
+ * @mbox: Inbound mailbox number
+ *
+ * Gets the next available inbound message from the inbound message queue.
+ * A pointer to the message is returned on success or NULL on failure.
+ */
+void *rio_hw_get_inb_message(struct rio_mport *mport, int mbox)
+{
+	u32 imr;
+	u32 phys_buf, virt_buf;
+	void *buf = NULL;
+	int buf_idx;
+
+	phys_buf = in_be32((void *)&msg_regs->ifqdpar);
+
+	/* If no more messages, then bail out */
+	if (phys_buf == in_be32((void *)&msg_regs->ifqepar))
+		goto out2;
+
+	virt_buf = (u32) msg_rx_ring.virt + (phys_buf - msg_rx_ring.phys);
+	buf_idx = (phys_buf - msg_rx_ring.phys) / RIO_MAX_MSG_SIZE;
+	buf = msg_rx_ring.virt_buffer[buf_idx];
+
+	if (!buf) {
+		printk(KERN_ERR
+		       "RIO: inbound message copy failed, no buffers\n");
+		goto out1;
+	}
+
+	/* Copy max message size, caller is expected to allocate that big */
+	memcpy(buf, (void *)virt_buf, RIO_MAX_MSG_SIZE);
+
+	/* Clear the available buffer */
+	msg_rx_ring.virt_buffer[buf_idx] = NULL;
+
+      out1:
+	imr = in_be32((void *)&msg_regs->imr);
+	out_be32((void *)&msg_regs->imr, imr | RIO_MSG_IMR_MI);
+
+      out2:
+	return buf;
+}
+
+EXPORT_SYMBOL_GPL(rio_hw_get_inb_message);
+
+/**
+ * mpc85xx_rio_dbell_handler - MPC85xx doorbell interrupt handler
+ * @irq: Linux interrupt number
+ * @dev_instance: Pointer to interrupt-specific data
+ * @regs: Register context
+ *
+ * Handles doorbell interrupts. Parses a list of registered
+ * doorbell event handlers and executes a matching event handler.
+ */
+static irqreturn_t
+mpc85xx_rio_dbell_handler(int irq, void *dev_instance, struct pt_regs *regs)
+{
+	int dsr;
+	struct rio_mport *port = (struct rio_mport *)dev_instance;
+
+	dsr = in_be32((void *)&msg_regs->dsr);
+
+	if (dsr & DOORBELL_DSR_TE) {
+		pr_info("RIO: doorbell reception error\n");
+		out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_TE);
+		goto out;
+	}
+
+	if (dsr & DOORBELL_DSR_QFI) {
+		pr_info("RIO: doorbell queue full\n");
+		out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_QFI);
+		goto out;
+	}
+
+	/* XXX Need to check/dispatch until queue empty */
+	if (dsr & DOORBELL_DSR_DIQI) {
+		u32 dmsg =
+		    (u32) dbell_ring.virt +
+		    (in_be32((void *)&msg_regs->dqdpar) & 0xfff);
+		u32 dmr;
+		struct rio_dbell *dbell;
+		int found = 0;
+
+		pr_debug
+		    ("RIO: processing doorbell, sid %2.2x tid %2.2x info %4.4x\n",
+		     DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
+
+		list_for_each_entry(dbell, &port->dbells, node) {
+			if ((dbell->res->start <= DBELL_INF(dmsg)) &&
+			    (dbell->res->end >= DBELL_INF(dmsg))) {
+				found = 1;
+				break;
+			}
+		}
+		if (found) {
+			dbell->dinb(port, DBELL_SID(dmsg), DBELL_TID(dmsg),
+				    DBELL_INF(dmsg));
+		} else {
+			pr_debug
+			    ("RIO: spurious doorbell, sid %2.2x tid %2.2x info %4.4x\n",
+			     DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
+		}
+		dmr = in_be32((void *)&msg_regs->dmr);
+		out_be32((void *)&msg_regs->dmr, dmr | DOORBELL_DMR_DI);
+		out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_DIQI);
+	}
+
+      out:
+	return IRQ_HANDLED;
+}
+
+/**
+ * mpc85xx_rio_doorbell_init - MPC85xx doorbell interface init
+ * @mport: Master port implementing the inbound doorbell unit
+ *
+ * Initializes doorbell unit hardware and inbound DMA buffer
+ * ring. Called from mpc85xx_rio_setup(). Returns %0 on success
+ * or %-ENOMEM on failure.
+ */
+static int mpc85xx_rio_doorbell_init(struct rio_mport *mport)
+{
+	int rc = 0;
+
+	/* Map outbound doorbell window immediately after maintenance window */
+	if (!(dbell_win =
+	      (u32) ioremap(mport->iores.start + RIO_MAINT_WIN_SIZE,
+			    RIO_DBELL_WIN_SIZE))) {
+		printk(KERN_ERR
+		       "RIO: unable to map outbound doorbell window\n");
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	/* Initialize inbound doorbells */
+	if (!(dbell_ring.virt = dma_alloc_coherent(NULL,
+						   512 * DOORBELL_MESSAGE_SIZE,
+						   &dbell_ring.phys,
+						   GFP_KERNEL))) {
+		printk(KERN_ERR "RIO: unable allocate inbound doorbell ring\n");
+		rc = -ENOMEM;
+		iounmap((void *)dbell_win);
+		goto out;
+	}
+
+	/* Point dequeue/enqueue pointers at first entry in ring */
+	out_be32((void *)&msg_regs->dqdpar, (u32) dbell_ring.phys);
+	out_be32((void *)&msg_regs->dqepar, (u32) dbell_ring.phys);
+
+	/* Clear interrupt status */
+	out_be32((void *)&msg_regs->dsr, 0x00000091);
+
+	/* Hook up doorbell handler */
+	if ((rc =
+	     request_irq(MPC85xx_IRQ_RIO_BELL, mpc85xx_rio_dbell_handler, 0,
+			 "dbell_rx", (void *)mport) < 0)) {
+		iounmap((void *)dbell_win);
+		dma_free_coherent(NULL, 512 * DOORBELL_MESSAGE_SIZE,
+				  dbell_ring.virt, dbell_ring.phys);
+		printk(KERN_ERR
+		       "MPC85xx RIO: unable to request inbound doorbell irq");
+		goto out;
+	}
+
+	/* Configure doorbells for snooping, 512 entries, and enable */
+	out_be32((void *)&msg_regs->dmr, 0x00108161);
+
+      out:
+	return rc;
+}
+
+static char *cmdline = NULL;
+
+static int mpc85xx_rio_get_hdid(int index)
+{
+	/* XXX Need to parse multiple entries in some format */
+	if (!cmdline)
+		return -1;
+
+	return simple_strtol(cmdline, NULL, 0);
+}
+
+static int mpc85xx_rio_get_cmdline(char *s)
+{
+	if (!s)
+		return 0;
+
+	cmdline = s;
+	return 1;
+}
+
+__setup("riohdid=", mpc85xx_rio_get_cmdline);
+
+/**
+ * mpc85xx_rio_setup - Setup MPC85xx RapidIO interface
+ * @law_start: Starting physical address of RapidIO LAW
+ * @law_size: Size of RapidIO LAW
+ *
+ * Initializes MPC85xx RapidIO hardware interface, configures
+ * master port with system-specific info, and registers the
+ * master port with the RapidIO subsystem.
+ */
+void mpc85xx_rio_setup(int law_start, int law_size)
+{
+	struct rio_ops *ops;
+	struct rio_mport *port;
+
+	ops = kmalloc(sizeof(struct rio_ops), GFP_KERNEL);
+	ops->lcread = mpc85xx_local_config_read;
+	ops->lcwrite = mpc85xx_local_config_write;
+	ops->cread = mpc85xx_rio_config_read;
+	ops->cwrite = mpc85xx_rio_config_write;
+	ops->dsend = mpc85xx_rio_doorbell_send;
+
+	port = kmalloc(sizeof(struct rio_mport), GFP_KERNEL);
+	port->id = 0;
+	port->index = 0;
+	INIT_LIST_HEAD(&port->dbells);
+	port->iores.start = law_start;
+	port->iores.end = law_start + law_size;
+	port->iores.flags = IORESOURCE_MEM;
+
+	rio_init_dbell_res(&port->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff);
+	rio_init_mbox_res(&port->riores[RIO_INB_MBOX_RESOURCE], 0, 0);
+	rio_init_mbox_res(&port->riores[RIO_OUTB_MBOX_RESOURCE], 0, 0);
+	strcpy(port->name, "RIO0 mport");
+
+	port->ops = ops;
+	port->host_deviceid = mpc85xx_rio_get_hdid(port->id);
+
+	rio_register_mport(port);
+
+	regs_win = (u32) ioremap(RIO_REGS_BASE, 0x20000);
+	atmu_regs = (struct rio_atmu_regs *)(regs_win + RIO_ATMU_REGS_OFFSET);
+	maint_atmu_regs = atmu_regs + 1;
+	dbell_atmu_regs = atmu_regs + 2;
+	msg_regs = (struct rio_msg_regs *)(regs_win + RIO_MSG_REGS_OFFSET);
+
+	/* Configure maintenance transaction window */
+	out_be32((void *)&maint_atmu_regs->rowbar, 0x000c0000);
+	out_be32((void *)&maint_atmu_regs->rowar, 0x80077015);
+
+	maint_win = (u32) ioremap(law_start, RIO_MAINT_WIN_SIZE);
+
+	/* Configure outbound doorbell window */
+	out_be32((void *)&dbell_atmu_regs->rowbar, 0x000c0400);
+	out_be32((void *)&dbell_atmu_regs->rowar, 0x8004200b);
+	mpc85xx_rio_doorbell_init(port);
+}

arch/ppc/syslib/ppc85xx_rio.h

+/*
+ * MPC85xx RapidIO definitions
+ *
+ * Copyright 2005 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * 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.
+ */
+
+#ifndef __PPC_SYSLIB_PPC85XX_RIO_H
+#define __PPC_SYSLIB_PPC85XX_RIO_H
+
+#include <linux/config.h>
+#include <linux/init.h>
+
+extern void mpc85xx_rio_setup(int law_start, int law_size);
+
+#endif				/* __PPC_SYSLIB_PPC85XX_RIO_H */

include/asm-ppc/rio.h

+/*
+ * RapidIO architecture support
+ *
+ * Copyright 2005 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * 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.
+ */
+
+#ifndef ASM_PPC_RIO_H
+#define ASM_PPC_RIO_H
+
+extern void platform_rio_init(void);
+
+#endif				/* ASM_PPC_RIO_H */