[PATCH] I2O: second code cleanup of sparse warnings and unneeded syncronization

Changes:
 - Added header "core.h" for i2o_core.ko internal definitions
 - More sparse fixes
 - Changed display of TID's in sysfs attributes from XXX to 0xXXX
 - Use the right functions for accessing I/O and normal memory
 - Removed error handling of SCSI device errors and let the SCSI layer
   take care of it
 - Added new device / removed device handling to SCSI-OSM
 - Make status access volatile
 - Cleaned up activation of I2O controller
 - Removed unnecessary wmb() and rmb() calls
 - Use own struct i2o_io for I/O memory instead of struct i2o_dma

Signed-off-by: Markus Lidel <Markus.Lidel@shadowconnect.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

10 files changed, 233 insertions, 261 deletions

diff --git a/drivers/message/i2o/core.h b/drivers/message/i2o/core.h
new file mode 100644
index 00000000000..49851cccc48
--- /dev/null
+++ b/drivers/message/i2o/core.h
@@ -0,0 +1,55 @@
+/*
+ *	I2O core internal declarations
+ *
+ *	Copyright (C) 2005	Markus Lidel <Markus.Lidel@shadowconnect.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.
+ *
+ *	Fixes/additions:
+ *		Markus Lidel <Markus.Lidel@shadowconnect.com>
+ *			initial version.
+ */
+
+/* Exec-OSM */
+extern struct bus_type i2o_bus_type;
+
+extern struct i2o_driver i2o_exec_driver;
+extern int i2o_exec_lct_get(struct i2o_controller *);
+
+extern int __init i2o_exec_init(void);
+extern void __exit i2o_exec_exit(void);
+
+/* driver */
+extern int i2o_driver_dispatch(struct i2o_controller *, u32);
+
+extern int __init i2o_driver_init(void);
+extern void __exit i2o_driver_exit(void);
+
+/* PCI */
+extern int __init i2o_pci_init(void);
+extern void __exit i2o_pci_exit(void);
+
+/* device */
+extern void i2o_device_remove(struct i2o_device *);
+extern int i2o_device_parse_lct(struct i2o_controller *);
+
+extern int i2o_device_init(void);
+extern void i2o_device_exit(void);
+
+/* IOP */
+extern struct i2o_controller *i2o_iop_alloc(void);
+extern void i2o_iop_free(struct i2o_controller *);
+
+extern int i2o_iop_add(struct i2o_controller *);
+extern void i2o_iop_remove(struct i2o_controller *);
+
+/* control registers relative to c->base */
+#define I2O_IRQ_STATUS	0x30
+#define I2O_IRQ_MASK	0x34
+#define I2O_IN_PORT	0x40
+#define I2O_OUT_PORT	0x44
+
+#define I2O_IRQ_OUTBOUND_POST	0x00000008
diff --git a/drivers/message/i2o/debug.c b/drivers/message/i2o/debug.c
index 2a5d478fc60..018ca887ca8 100644
--- a/drivers/message/i2o/debug.c
+++ b/drivers/message/i2o/debug.c
@@ -4,8 +4,6 @@
 #include <linux/pci.h>
 #include <linux/i2o.h>
 
-extern struct i2o_driver **i2o_drivers;
-extern unsigned int i2o_max_drivers;
 static void i2o_report_util_cmd(u8 cmd);
 static void i2o_report_exec_cmd(u8 cmd);
 static void i2o_report_fail_status(u8 req_status, u32 * msg);
@@ -23,7 +21,6 @@ void i2o_report_status(const char *severity, const char *str,
 	u8 cmd = (msg[1] >> 24) & 0xFF;
 	u8 req_status = (msg[4] >> 24) & 0xFF;
 	u16 detailed_status = msg[4] & 0xFFFF;
-	//struct i2o_driver *h = i2o_drivers[msg[2] & (i2o_max_drivers-1)];
 
 	if (cmd == I2O_CMD_UTIL_EVT_REGISTER)
 		return;		// No status in this reply
diff --git a/drivers/message/i2o/device.c b/drivers/message/i2o/device.c
index f1b7eb63d54..0ee342ea29b 100644
--- a/drivers/message/i2o/device.c
+++ b/drivers/message/i2o/device.c
@@ -16,9 +16,7 @@
 #include <linux/module.h>
 #include <linux/i2o.h>
 #include <linux/delay.h>
-
-/* Exec OSM functions */
-extern struct bus_type i2o_bus_type;
+#include "core.h"
 
 /**
  *	i2o_device_issue_claim - claim or release a device
@@ -293,12 +291,12 @@ int i2o_device_parse_lct(struct i2o_controller *c)
 	}
 
 	if (lct->table_size * 4 > c->dlct.len) {
-		memcpy_fromio(c->lct, c->dlct.virt, c->dlct.len);
+		memcpy(c->lct, c->dlct.virt, c->dlct.len);
 		up(&c->lct_lock);
 		return -EAGAIN;
 	}
 
-	memcpy_fromio(c->lct, c->dlct.virt, lct->table_size * 4);
+	memcpy(c->lct, c->dlct.virt, lct->table_size * 4);
 
 	lct = c->lct;
 
@@ -353,7 +351,7 @@ static ssize_t i2o_device_class_show_class_id(struct class_device *cd,
 {
 	struct i2o_device *dev = to_i2o_device(cd->dev);
 
-	sprintf(buf, "%03x\n", dev->lct_data.class_id);
+	sprintf(buf, "0x%03x\n", dev->lct_data.class_id);
 	return strlen(buf) + 1;
 };
 
@@ -368,7 +366,7 @@ static ssize_t i2o_device_class_show_tid(struct class_device *cd, char *buf)
 {
 	struct i2o_device *dev = to_i2o_device(cd->dev);
 
-	sprintf(buf, "%03x\n", dev->lct_data.tid);
+	sprintf(buf, "0x%03x\n", dev->lct_data.tid);
 	return strlen(buf) + 1;
 };
 
@@ -490,7 +488,7 @@ static int i2o_parm_issue(struct i2o_device *i2o_dev, int cmd, void *oplist,
 	if (rc == -ETIMEDOUT)
 		return rc;
 
-	memcpy_fromio(reslist, res.virt, res.len);
+	memcpy(reslist, res.virt, res.len);
 	i2o_dma_free(dev, &res);
 
 	/* Query failed */
@@ -532,17 +530,23 @@ int i2o_parm_field_get(struct i2o_device *i2o_dev, int group, int field,
 		       void *buf, int buflen)
 {
 	u16 opblk[] = { 1, 0, I2O_PARAMS_FIELD_GET, group, 1, field };
-	u8 resblk[8 + buflen];	/* 8 bytes for header */
+	u8 *resblk;		/* 8 bytes for header */
 	int size;
 
 	if (field == -1)	/* whole group */
 		opblk[4] = -1;
 
+	resblk = kmalloc(buflen + 8, GFP_KERNEL | GFP_ATOMIC);
+	if (!resblk)
+		return -ENOMEM;
+
 	size = i2o_parm_issue(i2o_dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
 			      sizeof(opblk), resblk, buflen + 8);
 
 	memcpy(buf, resblk + 8, buflen);	/* cut off header */
 
+	kfree(resblk);
+
 	if (size > buflen)
 		return buflen;
 
diff --git a/drivers/message/i2o/driver.c b/drivers/message/i2o/driver.c
index 393be8e2914..c32f9dbc574 100644
--- a/drivers/message/i2o/driver.c
+++ b/drivers/message/i2o/driver.c
@@ -17,11 +17,12 @@
 #include <linux/module.h>
 #include <linux/rwsem.h>
 #include <linux/i2o.h>
+#include "core.h"
 
 #define OSM_NAME	"i2o"
 
 /* max_drivers - Maximum I2O drivers (OSMs) which could be registered */
-unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
+static unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
 module_param_named(max_drivers, i2o_max_drivers, uint, 0);
 MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support");
 
@@ -179,15 +180,10 @@ void i2o_driver_unregister(struct i2o_driver *drv)
 int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
 {
 	struct i2o_driver *drv;
-	struct i2o_message __iomem *msg = i2o_msg_out_to_virt(c, m);
-	u32 context;
+	struct i2o_message *msg = i2o_msg_out_to_virt(c, m);
+	u32 context = le32_to_cpu(msg->u.s.icntxt);
 	unsigned long flags;
 
-	if(unlikely(!msg))
-		return -EIO;
-
-	context = readl(&msg->u.s.icntxt);
-
 	if (unlikely(context >= i2o_max_drivers)) {
 		osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
 			 context);
@@ -204,11 +200,11 @@ int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
 		return -EIO;
 	}
 
-	if ((readl(&msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
+	if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
 		struct i2o_device *dev, *tmp;
 		struct i2o_event *evt;
 		u16 size;
-		u16 tid = readl(&msg->u.head[1]) & 0xfff;
+		u16 tid = le32_to_cpu(msg->u.head[1]) & 0xfff;
 
 		osm_debug("event received from device %d\n", tid);
 
@@ -216,16 +212,16 @@ int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
 			return -EIO;
 
 		/* cut of header from message size (in 32-bit words) */
-		size = (readl(&msg->u.head[0]) >> 16) - 5;
+		size = (le32_to_cpu(msg->u.head[0]) >> 16) - 5;
 
 		evt = kmalloc(size * 4 + sizeof(*evt), GFP_ATOMIC | __GFP_ZERO);
 		if (!evt)
 			return -ENOMEM;
 
 		evt->size = size;
-		evt->tcntxt = readl(&msg->u.s.tcntxt);
-		evt->event_indicator = readl(&msg->body[0]);
-		memcpy_fromio(&evt->tcntxt, &msg->u.s.tcntxt, size * 4);
+		evt->tcntxt = le32_to_cpu(msg->u.s.tcntxt);
+		evt->event_indicator = le32_to_cpu(msg->body[0]);
+		memcpy(&evt->tcntxt, &msg->u.s.tcntxt, size * 4);
 
 		list_for_each_entry_safe(dev, tmp, &c->devices, list)
 		    if (dev->lct_data.tid == tid) {
diff --git a/drivers/message/i2o/exec-osm.c b/drivers/message/i2o/exec-osm.c
index 0160221c802..ffe0cecfa06 100644
--- a/drivers/message/i2o/exec-osm.c
+++ b/drivers/message/i2o/exec-osm.c
@@ -30,6 +30,7 @@
 #include <linux/module.h>
 #include <linux/i2o.h>
 #include <linux/delay.h>
+#include "core.h"
 
 #define OSM_NAME "exec-osm"
 
@@ -37,9 +38,6 @@ struct i2o_driver i2o_exec_driver;
 
 static int i2o_exec_lct_notify(struct i2o_controller *c, u32 change_ind);
 
-/* Module internal functions from other sources */
-extern int i2o_device_parse_lct(struct i2o_controller *);
-
 /* global wait list for POST WAIT */
 static LIST_HEAD(i2o_exec_wait_list);
 
@@ -50,7 +48,7 @@ struct i2o_exec_wait {
 	u32 tcntxt;		/* transaction context from reply */
 	int complete;		/* 1 if reply received otherwise 0 */
 	u32 m;			/* message id */
-	struct i2o_message __iomem *msg;	/* pointer to the reply message */
+	struct i2o_message *msg;	/* pointer to the reply message */
 	struct list_head list;	/* node in global wait list */
 };
 
@@ -162,7 +160,7 @@ int i2o_msg_post_wait_mem(struct i2o_controller *c, u32 m, unsigned long
 	barrier();
 
 	if (wait->complete) {
-		rc = readl(&wait->msg->body[0]) >> 24;
+		rc = le32_to_cpu(wait->msg->body[0]) >> 24;
 		i2o_flush_reply(c, wait->m);
 		i2o_exec_wait_free(wait);
 	} else {
@@ -202,8 +200,7 @@ int i2o_msg_post_wait_mem(struct i2o_controller *c, u32 m, unsigned long
  *	message must also be given back to the controller.
  */
 static int i2o_msg_post_wait_complete(struct i2o_controller *c, u32 m,
-				      struct i2o_message __iomem *msg,
-				      u32 context)
+				      struct i2o_message *msg, u32 context)
 {
 	struct i2o_exec_wait *wait, *tmp;
 	unsigned long flags;
@@ -378,11 +375,11 @@ static void i2o_exec_lct_modified(struct i2o_controller *c)
  *	code on failure and if the reply should be flushed.
  */
 static int i2o_exec_reply(struct i2o_controller *c, u32 m,
-			  struct i2o_message __iomem *msg)
+			  struct i2o_message *msg)
 {
 	u32 context;
 
-	if (readl(&msg->u.head[0]) & MSG_FAIL) {
+	if (le32_to_cpu(msg->u.head[0]) & MSG_FAIL) {
 		/*
 		 * If Fail bit is set we must take the transaction context of
 		 * the preserved message to find the right request again.
@@ -390,7 +387,7 @@ static int i2o_exec_reply(struct i2o_controller *c, u32 m,
 		struct i2o_message __iomem *pmsg;
 		u32 pm;
 
-		pm = readl(&msg->body[3]);
+		pm = le32_to_cpu(msg->body[3]);
 
 		pmsg = i2o_msg_in_to_virt(c, pm);
 
@@ -401,12 +398,12 @@ static int i2o_exec_reply(struct i2o_controller *c, u32 m,
 		/* Release the preserved msg */
 		i2o_msg_nop(c, pm);
 	} else
-		context = readl(&msg->u.s.tcntxt);
+		context = le32_to_cpu(msg->u.s.tcntxt);
 
 	if (context & 0x80000000)
 		return i2o_msg_post_wait_complete(c, m, msg, context);
 
-	if ((readl(&msg->u.head[1]) >> 24) == I2O_CMD_LCT_NOTIFY) {
+	if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_LCT_NOTIFY) {
 		struct work_struct *work;
 
 		pr_debug("%s: LCT notify received\n", c->name);
@@ -442,9 +439,9 @@ static int i2o_exec_reply(struct i2o_controller *c, u32 m,
  */
 static void i2o_exec_event(struct i2o_event *evt)
 {
-	if(likely(evt->i2o_dev))
-		osm_info("Event received from device: %d\n",
-			 evt->i2o_dev->lct_data.tid);
+	if (likely(evt->i2o_dev))
+		osm_debug("Event received from device: %d\n",
+			  evt->i2o_dev->lct_data.tid);
 	kfree(evt);
 };
 
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 1dd2b9dad50..28b3918dbc1 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -62,7 +62,7 @@
 #include "i2o_block.h"
 
 #define OSM_NAME	"block-osm"
-#define OSM_VERSION	"$Rev$"
+#define OSM_VERSION	"1.287"
 #define OSM_DESCRIPTION	"I2O Block Device OSM"
 
 static struct i2o_driver i2o_block_driver;
@@ -537,7 +537,7 @@ static int i2o_block_reply(struct i2o_controller *c, u32 m,
 
 static void i2o_block_event(struct i2o_event *evt)
 {
-	osm_info("event received\n");
+	osm_debug("event received\n");
 	kfree(evt);
 };
 
diff --git a/drivers/message/i2o/i2o_config.c b/drivers/message/i2o/i2o_config.c
index 7636833b462..8160a1f6c73 100644
--- a/drivers/message/i2o/i2o_config.c
+++ b/drivers/message/i2o/i2o_config.c
@@ -36,6 +36,8 @@
 
 #include <asm/uaccess.h>
 
+#define SG_TABLESIZE		30
+
 extern int i2o_parm_issue(struct i2o_device *, int, void *, int, void *, int);
 
 static int i2o_cfg_ioctl(struct inode *inode, struct file *fp, unsigned int cmd,
@@ -663,7 +665,7 @@ static int i2o_cfg_passthru32(struct file *file, unsigned cmnd, unsigned long ar
 		goto sg_list_cleanup;
 
 	if (sg_offset) {
-		u32 msg[MSG_FRAME_SIZE];
+		u32 msg[I2O_OUTBOUND_MSG_FRAME_SIZE];
 		/* Copy back the Scatter Gather buffers back to user space */
 		u32 j;
 		// TODO 64bit fix
@@ -671,7 +673,7 @@ static int i2o_cfg_passthru32(struct file *file, unsigned cmnd, unsigned long ar
 		int sg_size;
 
 		// re-acquire the original message to handle correctly the sg copy operation
-		memset(&msg, 0, MSG_FRAME_SIZE * 4);
+		memset(&msg, 0, I2O_OUTBOUND_MSG_FRAME_SIZE * 4);
 		// get user msg size in u32s
 		if (get_user(size, &user_msg[0])) {
 			rcode = -EFAULT;
@@ -902,7 +904,7 @@ static int i2o_cfg_passthru(unsigned long arg)
 		int sg_size;
 
 		// re-acquire the original message to handle correctly the sg copy operation
-		memset(&msg, 0, MSG_FRAME_SIZE * 4);
+		memset(&msg, 0, I2O_OUTBOUND_MSG_FRAME_SIZE * 4);
 		// get user msg size in u32s
 		if (get_user(size, &user_msg[0])) {
 			rcode = -EFAULT;
diff --git a/drivers/message/i2o/i2o_scsi.c b/drivers/message/i2o/i2o_scsi.c
index fef53b509a6..9f1744c3933 100644
--- a/drivers/message/i2o/i2o_scsi.c
+++ b/drivers/message/i2o/i2o_scsi.c
@@ -40,7 +40,6 @@
  *	Fix the resource management problems.
  */
 
-#define DEBUG 1
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
@@ -338,162 +337,89 @@ static int i2o_scsi_reply(struct i2o_controller *c, u32 m,
 			  struct i2o_message *msg)
 {
 	struct scsi_cmnd *cmd;
+	u32 error;
 	struct device *dev;
-	u8 as, ds, st;
 
 	cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
-
-	if (msg->u.head[0] & (1 << 13)) {
-		struct i2o_message __iomem *pmsg;	/* preserved message */
-		u32 pm;
-		int err = DID_ERROR;
-
-		pm = le32_to_cpu(msg->body[3]);
-
-		pmsg = i2o_msg_in_to_virt(c, pm);
-
-		osm_err("IOP fail.\n");
-		osm_err("From %d To %d Cmd %d.\n",
-			(msg->u.head[1] >> 12) & 0xFFF,
-			msg->u.head[1] & 0xFFF, msg->u.head[1] >> 24);
-		osm_err("Failure Code %d.\n", msg->body[0] >> 24);
-		if (msg->body[0] & (1 << 16))
-			osm_err("Format error.\n");
-		if (msg->body[0] & (1 << 17))
-			osm_err("Path error.\n");
-		if (msg->body[0] & (1 << 18))
-			osm_err("Path State.\n");
-		if (msg->body[0] & (1 << 18))
-		{
-			osm_err("Congestion.\n");
-			err = DID_BUS_BUSY;
-		}
-
-		osm_debug("Failing message is %p.\n", pmsg);
-
-		cmd = i2o_cntxt_list_get(c, readl(&pmsg->u.s.tcntxt));
-		if (!cmd)
-			return 1;
-
-		cmd->result = err << 16;
-		cmd->scsi_done(cmd);
-
-		/* Now flush the message by making it a NOP */
-		i2o_msg_nop(c, pm);
-
-		return 1;
+	if (unlikely(!cmd)) {
+		osm_err("NULL reply received!\n");
+		return -1;
 	}
 
 	/*
 	 *      Low byte is device status, next is adapter status,
 	 *      (then one byte reserved), then request status.
 	 */
-	ds = (u8) le32_to_cpu(msg->body[0]);
-	as = (u8) (le32_to_cpu(msg->body[0]) >> 8);
-	st = (u8) (le32_to_cpu(msg->body[0]) >> 24);
+	error = le32_to_cpu(msg->body[0]);
 
+	osm_debug("Completed %ld\n", cmd->serial_number);
+
+	cmd->result = error & 0xff;
 	/*
-	 *      Is this a control request coming back - eg an abort ?
+	 * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let
+	 * the SCSI layer handle the error
 	 */
+	if (cmd->result)
+		memcpy(cmd->sense_buffer, &msg->body[3],
+		       min(sizeof(cmd->sense_buffer), (size_t) 40));
 
-	if (!cmd) {
-		if (st)
-			osm_warn("SCSI abort: %08X", le32_to_cpu(msg->body[0]));
-		osm_info("SCSI abort completed.\n");
-		return -EFAULT;
-	}
+	/* only output error code if AdapterStatus is not HBA_SUCCESS */
+	if ((error >> 8) & 0xff)
+		osm_err("SCSI error %08x\n", error);
 
-	osm_debug("Completed %ld\n", cmd->serial_number);
+	dev = &c->pdev->dev;
+	if (cmd->use_sg)
+		dma_unmap_sg(dev, cmd->request_buffer, cmd->use_sg,
+			     cmd->sc_data_direction);
+	else if (cmd->SCp.dma_handle)
+		dma_unmap_single(dev, cmd->SCp.dma_handle, cmd->request_bufflen,
+				 cmd->sc_data_direction);
 
-	if (st) {
-		u32 count, error;
-		/* An error has occurred */
-
-		switch (st) {
-		case 0x06:
-			count = le32_to_cpu(msg->body[1]);
-			if (count < cmd->underflow) {
-				int i;
-
-				osm_err("SCSI underflow 0x%08X 0x%08X\n", count,
-					cmd->underflow);
-				osm_debug("Cmd: ");
-				for (i = 0; i < 15; i++)
-					pr_debug("%02X ", cmd->cmnd[i]);
-				pr_debug(".\n");
-				cmd->result = (DID_ERROR << 16);
-			}
-			break;
+	cmd->scsi_done(cmd);
 
-		default:
-			error = le32_to_cpu(msg->body[0]);
-
-			osm_err("SCSI error %08x\n", error);
-
-			if ((error & 0xff) == 0x02 /*CHECK_CONDITION */ ) {
-				int i;
-				u32 len = sizeof(cmd->sense_buffer);
-				len = (len > 40) ? 40 : len;
-				// Copy over the sense data
-				memcpy(cmd->sense_buffer, (void *)&msg->body[3],
-				       len);
-				for (i = 0; i <= len; i++)
-					osm_info("%02x\n",
-						 cmd->sense_buffer[i]);
-				if (cmd->sense_buffer[0] == 0x70
-				    && cmd->sense_buffer[2] == DATA_PROTECT) {
-					/* This is to handle an array failed */
-					cmd->result = (DID_TIME_OUT << 16);
-					printk(KERN_WARNING "%s: SCSI Data "
-					       "Protect-Device (%d,%d,%d) "
-					       "hba_status=0x%x, dev_status="
-					       "0x%x, cmd=0x%x\n", c->name,
-					       (u32) cmd->device->channel,
-					       (u32) cmd->device->id,
-					       (u32) cmd->device->lun,
-					       (error >> 8) & 0xff,
-					       error & 0xff, cmd->cmnd[0]);
-				} else
-					cmd->result = (DID_ERROR << 16);
-
-				break;
-			}
-
-			switch (as) {
-			case 0x0E:
-				/* SCSI Reset */
-				cmd->result = DID_RESET << 16;
-				break;
-
-			case 0x0F:
-				cmd->result = DID_PARITY << 16;
-				break;
-
-			default:
-				cmd->result = DID_ERROR << 16;
-				break;
-			}
+	return 1;
+};
 
-			break;
-		}
+/**
+ *	i2o_scsi_notify_device_add - Retrieve notifications of added devices
+ *	@i2o_dev: the I2O device which was added
+ *
+ *	If a I2O device is added we catch the notification, because I2O classes
+ *	other then SCSI peripheral will not be received through
+ *	i2o_scsi_probe().
+ */
+static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev)
+{
+	switch (i2o_dev->lct_data.class_id) {
+	case I2O_CLASS_EXECUTIVE:
+	case I2O_CLASS_RANDOM_BLOCK_STORAGE:
+		i2o_scsi_probe(&i2o_dev->device);
+		break;
 
-		cmd->scsi_done(cmd);
-		return 1;
+	default:
+		break;
 	}
+};
 
-	cmd->result = DID_OK << 16 | ds;
-
-	dev = &c->pdev->dev;
-	if (cmd->use_sg)
-		dma_unmap_sg(dev, (struct scatterlist *)cmd->buffer,
-			     cmd->use_sg, cmd->sc_data_direction);
-	else if (cmd->request_bufflen)
-		dma_unmap_single(dev, (dma_addr_t) ((long)cmd->SCp.ptr),
-				 cmd->request_bufflen, cmd->sc_data_direction);
-
-	cmd->scsi_done(cmd);
+/**
+ *	i2o_scsi_notify_device_remove - Retrieve notifications of removed
+ *				        devices
+ *	@i2o_dev: the I2O device which was removed
+ *
+ *	If a I2O device is removed, we catch the notification to remove the
+ *	corresponding SCSI device.
+ */
+static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev)
+{
+	switch (i2o_dev->lct_data.class_id) {
+	case I2O_CLASS_EXECUTIVE:
+	case I2O_CLASS_RANDOM_BLOCK_STORAGE:
+		i2o_scsi_remove(&i2o_dev->device);
+		break;
 
-	return 1;
+	default:
+		break;
+	}
 };
 
 /**
@@ -554,6 +480,8 @@ static struct i2o_driver i2o_scsi_driver = {
 	.name = OSM_NAME,
 	.reply = i2o_scsi_reply,
 	.classes = i2o_scsi_class_id,
+	.notify_device_add = i2o_scsi_notify_device_add,
+	.notify_device_remove = i2o_scsi_notify_device_remove,
 	.notify_controller_add = i2o_scsi_notify_controller_add,
 	.notify_controller_remove = i2o_scsi_notify_controller_remove,
 	.driver = {
@@ -712,7 +640,7 @@ static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt,
 	 */
 
 	/* Attach tags to the devices */
-	/*
+	/* FIXME: implement
 	   if(SCpnt->device->tagged_supported) {
 	   if(SCpnt->tag == HEAD_OF_QUEUE_TAG)
 	   scsi_flags |= 0x01000000;
diff --git a/drivers/message/i2o/iop.c b/drivers/message/i2o/iop.c
index 40312053b38..c32022bc2a2 100644
--- a/drivers/message/i2o/iop.c
+++ b/drivers/message/i2o/iop.c
@@ -28,8 +28,10 @@
 #include <linux/module.h>
 #include <linux/i2o.h>
 #include <linux/delay.h>
+#include "core.h"
 
-#define OSM_VERSION	"$Rev$"
+#define OSM_NAME	"i2o"
+#define OSM_VERSION	"1.288"
 #define OSM_DESCRIPTION	"I2O subsystem"
 
 /* global I2O controller list */
@@ -43,20 +45,6 @@ static struct i2o_dma i2o_systab;
 
 static int i2o_hrt_get(struct i2o_controller *c);
 
-/* Module internal functions from other sources */
-extern struct i2o_driver i2o_exec_driver;
-extern int i2o_exec_lct_get(struct i2o_controller *);
-extern void i2o_device_remove(struct i2o_device *);
-
-extern int __init i2o_driver_init(void);
-extern void __exit i2o_driver_exit(void);
-extern int __init i2o_exec_init(void);
-extern void __exit i2o_exec_exit(void);
-extern int __init i2o_pci_init(void);
-extern void __exit i2o_pci_exit(void);
-extern int i2o_device_init(void);
-extern void i2o_device_exit(void);
-
 /**
  *	i2o_msg_nop - Returns a message which is not used
  *	@c: I2O controller from which the message was created
@@ -92,16 +80,16 @@ void i2o_msg_nop(struct i2o_controller *c, u32 m)
  *	address from the read port (see the i2o spec). If no message is
  *	available returns I2O_QUEUE_EMPTY and msg is leaved untouched.
  */
-u32 i2o_msg_get_wait(struct i2o_controller *c, struct i2o_message __iomem **msg,
-		     int wait)
+u32 i2o_msg_get_wait(struct i2o_controller *c,
+		     struct i2o_message __iomem ** msg, int wait)
 {
 	unsigned long timeout = jiffies + wait * HZ;
 	u32 m;
 
 	while ((m = i2o_msg_get(c, msg)) == I2O_QUEUE_EMPTY) {
 		if (time_after(jiffies, timeout)) {
-			pr_debug("%s: Timeout waiting for message frame.\n",
-				 c->name);
+			osm_debug("%s: Timeout waiting for message frame.\n",
+				  c->name);
 			return I2O_QUEUE_EMPTY;
 		}
 		set_current_state(TASK_UNINTERRUPTIBLE);
@@ -466,7 +454,7 @@ static int i2o_iop_clear(struct i2o_controller *c)
  */
 static int i2o_iop_init_outbound_queue(struct i2o_controller *c)
 {
-	u8 *status = c->status.virt;
+	volatile u8 *status = c->status.virt;
 	u32 m;
 	struct i2o_message __iomem *msg;
 	ulong timeout;
@@ -474,21 +462,20 @@ static int i2o_iop_init_outbound_queue(struct i2o_controller *c)
 
 	osm_debug("%s: Initializing Outbound Queue...\n", c->name);
 
-	memset(status, 0, 4);
+	memset(c->status.virt, 0, 4);
 
 	m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
 	if (m == I2O_QUEUE_EMPTY)
 		return -ETIMEDOUT;
 
-	writel(EIGHT_WORD_MSG_SIZE | TRL_OFFSET_6, &msg->u.head[0]);
+	writel(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6, &msg->u.head[0]);
 	writel(I2O_CMD_OUTBOUND_INIT << 24 | HOST_TID << 12 | ADAPTER_TID,
 	       &msg->u.head[1]);
 	writel(i2o_exec_driver.context, &msg->u.s.icntxt);
-	writel(0x0106, &msg->u.s.tcntxt);	/* FIXME: why 0x0106, maybe in
-						   Spec? */
+	writel(0x00000000, &msg->u.s.tcntxt);
 	writel(PAGE_SIZE, &msg->body[0]);
 	/* Outbound msg frame size in words and Initcode */
-	writel(MSG_FRAME_SIZE << 16 | 0x80, &msg->body[1]);
+	writel(I2O_OUTBOUND_MSG_FRAME_SIZE << 16 | 0x80, &msg->body[1]);
 	writel(0xd0000004, &msg->body[2]);
 	writel(i2o_dma_low(c->status.phys), &msg->body[3]);
 	writel(i2o_dma_high(c->status.phys), &msg->body[4]);
@@ -503,17 +490,15 @@ static int i2o_iop_init_outbound_queue(struct i2o_controller *c)
 		}
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule_timeout(1);
-
-		rmb();
 	}
 
 	m = c->out_queue.phys;
 
 	/* Post frames */
-	for (i = 0; i < NMBR_MSG_FRAMES; i++) {
+	for (i = 0; i < I2O_MAX_OUTBOUND_MSG_FRAMES; i++) {
 		i2o_flush_reply(c, m);
 		udelay(1);	/* Promise */
-		m += MSG_FRAME_SIZE * 4;
+		m += I2O_OUTBOUND_MSG_FRAME_SIZE * sizeof(u32);
 	}
 
 	return 0;
@@ -530,20 +515,20 @@ static int i2o_iop_init_outbound_queue(struct i2o_controller *c)
  */
 static int i2o_iop_reset(struct i2o_controller *c)
 {
-	u8 *status = c->status.virt;
+	volatile u8 *status = c->status.virt;
 	struct i2o_message __iomem *msg;
 	u32 m;
 	unsigned long timeout;
 	i2o_status_block *sb = c->status_block.virt;
 	int rc = 0;
 
-	pr_debug("%s: Resetting controller\n", c->name);
+	osm_debug("%s: Resetting controller\n", c->name);
 
 	m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
 	if (m == I2O_QUEUE_EMPTY)
 		return -ETIMEDOUT;
 
-	memset(status, 0, 8);
+	memset(c->status_block.virt, 0, 8);
 
 	/* Quiesce all IOPs first */
 	i2o_iop_quiesce_all();
@@ -568,8 +553,6 @@ static int i2o_iop_reset(struct i2o_controller *c)
 
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule_timeout(1);
-
-		rmb();
 	}
 
 	switch (*status) {
@@ -984,11 +967,11 @@ int i2o_status_get(struct i2o_controller *c)
 {
 	struct i2o_message __iomem *msg;
 	u32 m;
-	u8 *status_block;
+	volatile u8 *status_block;
 	unsigned long timeout;
 
 	status_block = (u8 *) c->status_block.virt;
-	memset(status_block, 0, sizeof(i2o_status_block));
+	memset(c->status_block.virt, 0, sizeof(i2o_status_block));
 
 	m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
 	if (m == I2O_QUEUE_EMPTY)
@@ -1017,8 +1000,6 @@ int i2o_status_get(struct i2o_controller *c)
 
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule_timeout(1);
-
-		rmb();
 	}
 
 #ifdef DEBUG
@@ -1107,6 +1088,11 @@ static void i2o_iop_release(struct device *dev)
 	i2o_iop_free(c);
 };
 
+/* I2O controller class */
+static struct class i2o_controller_class = {
+	.name = "i2o_controller",
+};
+
 /**
  *	i2o_iop_alloc - Allocate and initialize a i2o_controller struct
  *
@@ -1136,8 +1122,14 @@ struct i2o_controller *i2o_iop_alloc(void)
 	sprintf(c->name, "iop%d", c->unit);
 
 	device_initialize(&c->device);
+	class_device_initialize(&c->classdev);
+
 	c->device.release = &i2o_iop_release;
+	c->classdev.class = &i2o_controller_class;
+	c->classdev.dev = &c->device;
+
 	snprintf(c->device.bus_id, BUS_ID_SIZE, "iop%d", c->unit);
+	snprintf(c->classdev.class_id, BUS_ID_SIZE, "iop%d", c->unit);
 
 #if BITS_PER_LONG == 64
 	spin_lock_init(&c->context_list_lock);
@@ -1161,45 +1153,55 @@ int i2o_iop_add(struct i2o_controller *c)
 {
 	int rc;
 
-	if((rc = device_add(&c->device))) {
-		printk(KERN_ERR "%s: could not register controller\n", c->name);
+	if ((rc = device_add(&c->device))) {
+		osm_err("%s: could not add controller\n", c->name);
 		goto iop_reset;
 	}
 
-	printk(KERN_INFO "%s: Activating I2O controller...\n", c->name);
-	printk(KERN_INFO "%s: This may take a few minutes if there are many "
-	       "devices\n", c->name);
+	if ((rc = class_device_add(&c->classdev))) {
+		osm_err("%s: could not add controller class\n", c->name);
+		goto device_del;
+	}
+
+	osm_info("%s: Activating I2O controller...\n", c->name);
+	osm_info("%s: This may take a few minutes if there are many devices\n",
+		 c->name);
 
 	if ((rc = i2o_iop_activate(c))) {
-		printk(KERN_ERR "%s: could not activate controller\n",
-		       c->name);
-		goto iop_reset;
+		osm_err("%s: could not activate controller\n", c->name);
+		goto class_del;
 	}
 
-	pr_debug("%s: building sys table...\n", c->name);
+	osm_debug("%s: building sys table...\n", c->name);
 
 	if ((rc = i2o_systab_build()))
-		goto iop_reset;
+		goto class_del;
 
-	pr_debug("%s: online controller...\n", c->name);
+	osm_debug("%s: online controller...\n", c->name);
 
 	if ((rc = i2o_iop_online(c)))
-		goto iop_reset;
+		goto class_del;
 
-	pr_debug("%s: getting LCT...\n", c->name);
+	osm_debug("%s: getting LCT...\n", c->name);
 
 	if ((rc = i2o_exec_lct_get(c)))
-		goto iop_reset;
+		goto class_del;
 
 	list_add(&c->list, &i2o_controllers);
 
 	i2o_driver_notify_controller_add_all(c);
 
-	printk(KERN_INFO "%s: Controller added\n", c->name);
+	osm_info("%s: Controller added\n", c->name);
 
 	return 0;
 
-iop_reset:
+      class_del:
+	class_device_del(&c->classdev);
+
+      device_del:
+	device_del(&c->device);
+
+      iop_reset:
 	i2o_iop_reset(c);
 
 	return rc;
@@ -1260,16 +1262,18 @@ static int __init i2o_iop_init(void)
 	if (rc)
 		goto exit;
 
-	rc = i2o_driver_init();
-	if (rc)
+	if ((rc = class_register(&i2o_controller_class))) {
+		osm_err("can't register class i2o_controller\n");
 		goto device_exit;
+	}
 
-	rc = i2o_exec_init();
-	if (rc)
+	if ((rc = i2o_driver_init()))
+		goto class_exit;
+
+	if ((rc = i2o_exec_init()))
 		goto driver_exit;
 
-	rc = i2o_pci_init();
-	if (rc < 0)
+	if ((rc = i2o_pci_init()))
 		goto exec_exit;
 
 	return 0;
@@ -1280,6 +1284,9 @@ static int __init i2o_iop_init(void)
       driver_exit:
 	i2o_driver_exit();
 
+      class_exit:
+	class_unregister(&i2o_controller_class);
+
       device_exit:
 	i2o_device_exit();
 
@@ -1297,6 +1304,7 @@ static void __exit i2o_iop_exit(void)
 	i2o_pci_exit();
 	i2o_exec_exit();
 	i2o_driver_exit();
+	class_unregister(&i2o_controller_class);
 	i2o_device_exit();
 };
 
diff --git a/drivers/message/i2o/pci.c b/drivers/message/i2o/pci.c
index 964fe481849..442e34506b9 100644
--- a/drivers/message/i2o/pci.c
+++ b/drivers/message/i2o/pci.c
@@ -30,15 +30,7 @@
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/i2o.h>
-
-/* Module internal functions from other sources */
-extern struct i2o_controller *i2o_iop_alloc(void);
-extern void i2o_iop_free(struct i2o_controller *);
-
-extern int i2o_iop_add(struct i2o_controller *);
-extern void i2o_iop_remove(struct i2o_controller *);
-
-extern int i2o_driver_dispatch(struct i2o_controller *, u32);
+#include "core.h"
 
 /* PCI device id table for all I2O controllers */
 static struct pci_device_id __devinitdata i2o_pci_ids[] = {
@@ -248,9 +240,7 @@ static int i2o_pci_irq_enable(struct i2o_controller *c)
 	struct pci_dev *pdev = c->pdev;
 	int rc;
 
-	wmb();
 	writel(0xffffffff, c->irq_mask);
-	wmb();
 
 	if (pdev->irq) {
 		rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ,
@@ -263,7 +253,6 @@ static int i2o_pci_irq_enable(struct i2o_controller *c)
 	}
 
 	writel(0x00000000, c->irq_mask);
-	wmb();
 
 	printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
 
@@ -278,9 +267,7 @@ static int i2o_pci_irq_enable(struct i2o_controller *c)
  */
 static void i2o_pci_irq_disable(struct i2o_controller *c)
 {
-	wmb();
 	writel(0xffffffff, c->irq_mask);
-	wmb();
 
 	if (c->pdev->irq > 0)
 		free_irq(c->pdev->irq, c);
@@ -406,11 +393,11 @@ static int __devinit i2o_pci_probe(struct pci_dev *pdev,
 	if ((rc = i2o_iop_add(c)))
 		goto uninstall;
 
+	get_device(&c->device);
+
 	if (i960)
 		pci_write_config_word(i960, 0x42, 0x03ff);
 
-	get_device(&c->device);
-
 	return 0;
 
       uninstall:
@@ -478,6 +465,4 @@ void __exit i2o_pci_exit(void)
 {
 	pci_unregister_driver(&i2o_pci_driver);
 };
-
-EXPORT_SYMBOL(i2o_dma_realloc);
 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);