MCA sysfs changes

These changes make MCA use sysfs.  They export the identical api
to the previous MCA functions, but now everything operates in
terms of sysfs struct devices.

drivers/Makefile

@@ -42,5 +42,6 @@ obj-$(CONFIG_MD)		+= md/
 obj-$(CONFIG_BT)		+= bluetooth/
 obj-$(CONFIG_HOTPLUG_PCI)	+= hotplug/
 obj-$(CONFIG_ISDN_BOOL)		+= isdn/
+obj-$(CONFIG_MCA)		+= mca/
 
 include $(TOPDIR)/Rules.make

drivers/mca/Makefile

+# Makefile for the Linux MCA bus support
+
+obj-y	:= mca-bus.o mca-legacy.o
+
+obj-$(CONFIG_PROC_FS)	+= mca-proc.o
+
+export-objs	:= mca-bus.o mca-legacy.o mca-proc.o
+
+include $(TOPDIR)/Rules.make

drivers/mca/mca-bus.c

+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/*
+ * MCA bus support functions for sysfs.
+ *
+ * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
+ *
+**-----------------------------------------------------------------------------
+**  
+**  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.  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.
+**
+**-----------------------------------------------------------------------------
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/mca.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <asm/io.h>
+
+/* Very few machines have more than one MCA bus.  However, there are
+ * those that do (Voyager 35xx/5xxx), so we do it this way for future
+ * expansion.  None that I know have more than 2 */
+struct mca_bus *mca_root_busses[MAX_MCA_BUSSES];
+
+#define MCA_DEVINFO(i,s) { .pos = i, .name = s }
+
+struct mca_device_info {
+	short pos_id;		/* the 2 byte pos id for this card */
+	char name[DEVICE_NAME_SIZE];
+};
+
+static int mca_bus_match (struct device *dev, struct device_driver *drv)
+{
+	struct mca_device *mca_dev = to_mca_device (dev);
+	struct mca_driver *mca_drv = to_mca_driver (drv);
+	const short *mca_ids = mca_drv->id_table;
+
+	if (!mca_ids)
+		return 0;
+
+	while (*mca_ids) {
+		if (*mca_ids == mca_dev->pos_id)
+			return 1;
+
+		mca_ids++;
+	}
+
+	return 0;
+}
+
+struct bus_type mca_bus_type = {
+	.name  = "MCA",
+	.match = mca_bus_match,
+};
+EXPORT_SYMBOL (mca_bus_type);
+
+int mca_driver_register (struct mca_driver *mca_drv)
+{
+	int r;
+	
+	mca_drv->driver.bus = &mca_bus_type;
+	if ((r = driver_register (&mca_drv->driver)) < 0)
+		return r;
+
+	return 1;
+}
+
+void mca_driver_unregister (struct mca_driver *mca_drv)
+{
+	bus_remove_driver (&mca_drv->driver);
+	driver_unregister (&mca_drv->driver);
+}
+
+
+static ssize_t mca_show_pos_id(struct device *dev, char *buf, size_t count,
+			       loff_t off)
+{
+	/* four digits, \n and trailing \0 */
+	char mybuf[6];
+	struct mca_device *mca_dev = to_mca_device(dev);
+	int len;
+
+	if(mca_dev->pos_id < MCA_DUMMY_POS_START)
+		len = sprintf(mybuf, "%04x\n", mca_dev->pos_id);
+	else
+		len = sprintf(mybuf, "none\n");
+
+	len++;
+	if(len > off) {
+		len = min((size_t)(len - off), count);
+		memcpy(buf + off, mybuf + off, len);
+	} else {
+		len = 0;
+	}
+	return len;
+}
+static ssize_t mca_show_pos(struct device *dev, char *buf, size_t count,
+			    loff_t off)
+{
+	/* enough for 8 two byte hex chars plus space and new line */
+	char mybuf[26];
+	int j, len=0;
+	struct mca_device *mca_dev = to_mca_device(dev);
+
+	for(j=0; j<8; j++)
+		len += sprintf(mybuf+len, "%02x ", mca_dev->pos[j]);
+	/* change last trailing space to new line */
+	mybuf[len-1] = '\n';
+	len++;
+	if(len > off) {
+		len = min((size_t)(len - off), count);
+		memcpy(buf + off, mybuf + off, len);
+	} else {
+		len = 0;
+	}
+	return len;
+}
+
+static DEVICE_ATTR(id, S_IRUGO, mca_show_pos_id, NULL);
+static DEVICE_ATTR(pos, S_IRUGO, mca_show_pos, NULL);
+
+int __init mca_register_device (int bus, struct mca_device *mca_dev)
+{
+	struct mca_bus *mca_bus = mca_root_busses[bus];
+
+	mca_dev->dev.parent = &mca_bus->dev;
+	mca_dev->dev.bus = &mca_bus_type;
+	sprintf (mca_dev->dev.bus_id, "%02d:%02X", bus, mca_dev->slot);
+	mca_dev->dma_mask = mca_bus->default_dma_mask;
+	/* FIXME: uncomment this when we get a global idea of where
+	 * dma_mask goes */
+	//mca_dev->dev.dma_mask = &mca_dev->dma_mask;
+
+	if (device_register(&mca_dev->dev))
+		return 0;
+
+	device_create_file(&mca_dev->dev, &dev_attr_id);
+	device_create_file(&mca_dev->dev, &dev_attr_pos);
+
+	return 1;
+}
+
+/* */
+struct mca_bus * __devinit mca_attach_bus(int bus)
+{
+	struct mca_bus *mca_bus;
+
+	if (unlikely(mca_root_busses[bus] != NULL)) {
+		/* This should never happen, but just in case */
+		printk(KERN_EMERG "MCA tried to add already existing bus %d\n",
+		       bus);
+		dump_stack();
+		return NULL;
+	}
+
+	mca_bus = kmalloc(sizeof(struct mca_bus), GFP_KERNEL);
+	if (!mca_bus)
+		return NULL;
+	memset(mca_bus, 0, sizeof(struct mca_bus));
+	sprintf(mca_bus->dev.bus_id,"mca%d",bus);
+	sprintf(mca_bus->dev.name,"Host %s MCA Bridge", bus ? "Secondary" : "Primary");
+	device_register(&mca_bus->dev);
+
+	mca_root_busses[bus] = mca_bus;
+
+	return mca_bus;
+}
+
+int __init mca_system_init (void)
+{
+	return bus_register(&mca_bus_type);
+}
+
+EXPORT_SYMBOL (mca_driver_register);
+EXPORT_SYMBOL (mca_driver_unregister);

drivers/mca/mca-proc.c

+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/*
+ * MCA bus support functions for the proc fs.
+ *
+ * NOTE: this code *requires* the legacy MCA api.
+ *
+ * Legacy API means the API that operates in terms of MCA slot number
+ *
+ * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
+ *
+**-----------------------------------------------------------------------------
+**  
+**  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.  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.
+**
+**-----------------------------------------------------------------------------
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/mca.h>
+
+static int get_mca_info_helper(struct mca_device *mca_dev, char *page, int len)
+{
+	int j;
+
+	for(j=0; j<8; j++)
+		len += sprintf(page+len, "%02x ",
+			       mca_dev ? mca_dev->pos[j] : 0xff);
+	len += sprintf(page+len, " %s\n", mca_dev ? mca_dev->dev.name : "");
+	return len;
+}
+
+int get_mca_info(char *page, char **start, off_t off,
+		 int count, int *eof, void *data)
+{
+	int i, len = 0;
+
+	if(MCA_bus) {
+		struct mca_device *mca_dev;
+		/* Format POS registers of eight MCA slots */
+
+		for(i=0; i<MCA_MAX_SLOT_NR; i++) {
+			mca_dev = mca_find_device_by_slot(i);
+
+			len += sprintf(page+len, "Slot %d: ", i+1);
+			len = get_mca_info_helper(mca_dev, page, len);
+		}
+
+		/* Format POS registers of integrated video subsystem */
+
+		mca_dev = mca_find_device_by_slot(MCA_INTEGVIDEO);
+		len += sprintf(page+len, "Video : ");
+		len = get_mca_info_helper(mca_dev, page, len);
+
+		/* Format POS registers of integrated SCSI subsystem */
+
+		mca_dev = mca_find_device_by_slot(MCA_INTEGSCSI);
+		len += sprintf(page+len, "SCSI  : ");
+		len = get_mca_info_helper(mca_dev, page, len);
+
+		/* Format POS registers of motherboard */
+
+		mca_dev = mca_find_device_by_slot(MCA_MOTHERBOARD);
+		len += sprintf(page+len, "Planar: ");
+		len = get_mca_info_helper(mca_dev, page, len);
+	} else {
+		/* Leave it empty if MCA not detected - this should *never*
+		 * happen!
+		 */
+	}
+
+	if (len <= off+count) *eof = 1;
+	*start = page + off;
+	len -= off;
+	if (len>count) len = count;
+	if (len<0) len = 0;
+	return len;
+}
+
+/*--------------------------------------------------------------------*/
+
+static int mca_default_procfn(char* buf, struct mca_device *mca_dev)
+{
+	int len = 0, i;
+	int slot = mca_dev->slot;
+
+	/* Print out the basic information */
+
+	if(slot < MCA_MAX_SLOT_NR) {
+		len += sprintf(buf+len, "Slot: %d\n", slot+1);
+	} else if(slot == MCA_INTEGSCSI) {
+		len += sprintf(buf+len, "Integrated SCSI Adapter\n");
+	} else if(slot == MCA_INTEGVIDEO) {
+		len += sprintf(buf+len, "Integrated Video Adapter\n");
+	} else if(slot == MCA_MOTHERBOARD) {
+		len += sprintf(buf+len, "Motherboard\n");
+	}
+	if(mca_dev->dev.name[0]) {
+
+		/* Drivers might register a name without /proc handler... */
+
+		len += sprintf(buf+len, "Adapter Name: %s\n",
+			       mca_dev->dev.name);
+	} else {
+		len += sprintf(buf+len, "Adapter Name: Unknown\n");
+	}
+	len += sprintf(buf+len, "Id: %02x%02x\n",
+		mca_dev->pos[1], mca_dev->pos[0]);
+	len += sprintf(buf+len, "Enabled: %s\nPOS: ",
+		mca_isenabled(slot) ? "Yes" : "No");
+	for(i=0; i<8; i++) {
+		len += sprintf(buf+len, "%02x ", mca_dev->pos[i]);
+	}
+	len += sprintf(buf+len, "\nDriver Installed: %s",
+		mca_is_adapter_used(slot) ? "Yes" : "No");
+	buf[len++] = '\n';
+	buf[len] = 0;
+
+	return len;
+} /* mca_default_procfn() */
+
+static int get_mca_machine_info(char* page, char **start, off_t off,
+				 int count, int *eof, void *data)
+{
+	int len = 0;
+
+	len += sprintf(page+len, "Model Id: 0x%x\n", machine_id);
+	len += sprintf(page+len, "Submodel Id: 0x%x\n", machine_submodel_id);
+	len += sprintf(page+len, "BIOS Revision: 0x%x\n", BIOS_revision);
+
+	if (len <= off+count) *eof = 1;
+	*start = page + off;
+	len -= off;
+	if (len>count) len = count;
+	if (len<0) len = 0;
+	return len;
+}
+
+static int mca_read_proc(char *page, char **start, off_t off,
+				 int count, int *eof, void *data)
+{
+	struct mca_device *mca_dev = (struct mca_device *)data;
+	int len = 0;
+
+	/* Get the standard info */
+
+	len = mca_default_procfn(page, mca_dev);
+
+	/* Do any device-specific processing, if there is any */
+
+	if(mca_dev->procfn) {
+		len += mca_dev->procfn(page+len, mca_dev->slot,
+				       mca_dev->proc_dev);
+	}
+	if (len <= off+count) *eof = 1;
+	*start = page + off;
+	len -= off;
+	if (len>count) len = count;
+	if (len<0) len = 0;
+	return len;
+} /* mca_read_proc() */
+
+/*--------------------------------------------------------------------*/
+
+void __init mca_do_proc_init(void)
+{
+	int i;
+	struct proc_dir_entry *proc_mca;
+	struct proc_dir_entry* node = NULL;
+	struct mca_device *mca_dev;
+
+	proc_mca = proc_mkdir("mca", &proc_root);
+	create_proc_read_entry("pos",0,proc_mca,get_mca_info,NULL);
+	create_proc_read_entry("machine",0,proc_mca,get_mca_machine_info,NULL);
+
+	/* Initialize /proc/mca entries for existing adapters */
+
+	for(i = 0; i < MCA_NUMADAPTERS; i++) {
+		mca_dev = mca_find_device_by_slot(i);
+		if(!mca_dev)
+			continue;
+
+		mca_dev->procfn = NULL;
+
+		if(i < MCA_MAX_SLOT_NR) sprintf(mca_dev->procname,"slot%d", i+1);
+		else if(i == MCA_INTEGVIDEO) sprintf(mca_dev->procname,"video");
+		else if(i == MCA_INTEGSCSI) sprintf(mca_dev->procname,"scsi");
+		else if(i == MCA_MOTHERBOARD) sprintf(mca_dev->procname,"planar");
+
+		if(!mca_isadapter(i)) continue;
+
+		node = create_proc_read_entry(mca_dev->procname, 0, proc_mca,
+					      mca_read_proc, (void *)mca_dev);
+
+		if(node == NULL) {
+			printk("Failed to allocate memory for MCA proc-entries!");
+			return;
+		}
+	}
+
+} /* mca_do_proc_init() */
+
+/**
+ *	mca_set_adapter_procfn - Set the /proc callback
+ *	@slot: slot to configure
+ *	@procfn: callback function to call for /proc
+ *	@dev: device information passed to the callback
+ *
+ *	This sets up an information callback for /proc/mca/slot?.  The
+ *	function is called with the buffer, slot, and device pointer (or
+ *	some equally informative context information, or nothing, if you
+ *	prefer), and is expected to put useful information into the
+ *	buffer.  The adapter name, ID, and POS registers get printed
+ *	before this is called though, so don't do it again.
+ *
+ *	This should be called with a %NULL @procfn when a module
+ *	unregisters, thus preventing kernel crashes and other such
+ *	nastiness.
+ */
+
+void mca_set_adapter_procfn(int slot, MCA_ProcFn procfn, void* proc_dev)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return;
+
+	mca_dev->procfn = procfn;
+	mca_dev->proc_dev = proc_dev;
+}
+EXPORT_SYMBOL(mca_set_adapter_procfn);

include/linux/mca.h

@@ -6,6 +6,11 @@
 #ifndef _LINUX_MCA_H
 #define _LINUX_MCA_H
 
+/* FIXME: This shouldn't happen, but we need everything that previously
+ * included mca.h to compile.  Take it out later when the MCA #includes
+ * are sorted out */
+#include <linux/device.h>
+
 /* The detection of MCA bus is done in the real mode (using BIOS).
  * The information is exported to the protected code, where this
  * variable is set to one in case MCA bus was detected.
@@ -19,6 +24,13 @@ extern int  MCA_bus;
  */
 #define MCA_MAX_SLOT_NR  8
 
+/* Most machines have only one MCA bus.  The only multiple bus machines
+ * I know have at most two */
+#define MAX_MCA_BUSSES 2
+
+#define MCA_PRIMARY_BUS		0
+#define MCA_SECONDARY_BUS	1
+
 /* MCA_NOTFOUND is an error condition.  The other two indicate
  * motherboard POS registers contain the adapter.  They might be
  * returned by the mca_find_adapter() function, and can be used as
@@ -35,6 +47,20 @@ extern int  MCA_bus;
 #define MCA_INTEGVIDEO	(MCA_MAX_SLOT_NR+1)
 #define MCA_MOTHERBOARD (MCA_MAX_SLOT_NR+2)
 
+#define MCA_DUMMY_POS_START	0x10000
+#define MCA_INTEGSCSI_POS	(MCA_DUMMY_POS_START+1)
+#define MCA_INTEGVIDEO_POS	(MCA_DUMMY_POS_START+2)
+#define MCA_MOTHERBOARD_POS	(MCA_DUMMY_POS_START+3)
+
+
+/* MCA registers */
+
+#define MCA_MOTHERBOARD_SETUP_REG	0x94
+#define MCA_ADAPTER_SETUP_REG		0x96
+#define MCA_POS_REG(n)			(0x100+(n))
+
+#define MCA_ENABLED	0x01	/* POS 2, set if adapter enabled */
+
 /* Max number of adapters, including both slots and various integrated
  * things.
  */
@@ -78,7 +104,6 @@ extern char* mca_get_adapter_name(int slot);
  * nastiness.
  */
 typedef int (*MCA_ProcFn)(char* buf, int slot, void* dev);
-extern void mca_set_adapter_procfn(int slot, MCA_ProcFn, void* dev);
 
 /* These routines actually mess with the hardware POS registers.  They
  * temporarily disable the device (and interrupts), so make sure you know
@@ -102,4 +127,74 @@ extern void mca_write_pos(int slot, int reg, unsigned char byte);
  */
 extern void mca_handle_nmi(void);
 
+enum MCA_AdapterStatus {
+	MCA_ADAPTER_NORMAL = 0,
+	MCA_ADAPTER_NONE = 1,
+	MCA_ADAPTER_DISABLED = 2,
+	MCA_ADAPTER_ERROR = 3
+};
+
+struct mca_bus {
+	u64			default_dma_mask;
+	int			number;
+	struct device		dev;
+};
+#define to_mca_bus(mdev) container_of(mdev, struct mca_bus, dev)
+
+struct mca_device {
+	u64			dma_mask;
+	int			pos_id;
+	int			slot;
+
+	/* is there a driver installed? 0 - No, 1 - Yes */
+	int			driver_loaded;
+	/* POS registers */
+	unsigned char		pos[8];
+	/* if a pseudo adapter of the motherboard, this is the motherboard
+	 * register value to use for setup cycles */
+	short			pos_register;
+	
+	enum MCA_AdapterStatus	status;
+#ifdef CONFIG_PROC_FS
+	/* name of the proc/mca file */
+	char			procname[8];
+	/* /proc info callback */
+	MCA_ProcFn		procfn;
+	/* device/context info for proc callback */
+	void			*proc_dev;
+#endif
+	struct device		dev;
+};
+#define to_mca_device(mdev) container_of(mdev, struct mca_device, dev)
+
+struct mca_driver {
+	const short		*id_table;
+	struct device_driver	driver;
+};
+#define to_mca_driver(mdriver) container_of(mdriver, struct mca_driver, driver)
+
+extern int mca_driver_register(struct mca_driver *);
+extern int mca_register_device(int bus, struct mca_device *);
+extern struct mca_device *mca_find_device_by_slot(int slot);
+extern int mca_system_init(void);
+extern struct mca_bus *mca_attach_bus(int);
+
+
+extern spinlock_t mca_lock;
+
+extern struct bus_type mca_bus_type;
+
+#ifdef CONFIG_PROC_FS
+extern void mca_do_proc_init(void);
+extern void mca_set_adapter_procfn(int slot, MCA_ProcFn, void* dev);
+#else
+static inline void mca_do_proc_init(void)
+{
+}
+
+static inline void mca_set_adapter_procfn(int slot, MCA_ProcFn *fn, void* dev)
+{
+}
+#endif
+
 #endif /* _LINUX_MCA_H */