--- linux-2.4.22/Documentation/Configure.help	2003-08-25 04:44:39.000000000 -0700
+++ linux-2.4.22-isw/Documentation/Configure.help	2003-09-24 12:22:34.000000000 -0700
@@ -2018,6 +2018,19 @@
   If you choose to compile this as a module, the module will be called
   hptraid.o.
 
+Intel Software RAID
+CONFIG_BLK_DEV_ATARAID_ISW
+  ******* Experimental Driver *********
+  This option enables support for the Intel Software RAID format.
+  Say Y or M if you have hardware which supports this format. 
+  Currently Intel's ICH5R chipset uses this format.
+  This driver uses /dev/ataraid/dXpY (X and Y numbers) as device
+  names.
+
+  If you choose to compile this as a module, the module will be called
+  iswraid.o.
+
+
 Support for Acer PICA 1 chipset
 CONFIG_ACER_PICA_61
   This is a machine with a R4400 133/150 MHz CPU. To compile a Linux
--- linux-2.4.22/drivers/ide/Config.in	2003-08-25 04:44:41.000000000 -0700
+++ linux-2.4.22-isw/drivers/ide/Config.in	2003-09-24 12:22:35.000000000 -0700
@@ -220,5 +220,6 @@
 dep_tristate '   Support Promise software RAID (Fasttrak(tm)) (EXPERIMENTAL)' CONFIG_BLK_DEV_ATARAID_PDC $CONFIG_BLK_DEV_IDE $CONFIG_EXPERIMENTAL $CONFIG_BLK_DEV_ATARAID
 dep_tristate '   Highpoint 370 software RAID (EXPERIMENTAL)' CONFIG_BLK_DEV_ATARAID_HPT $CONFIG_BLK_DEV_IDE $CONFIG_EXPERIMENTAL $CONFIG_BLK_DEV_ATARAID
 dep_tristate '   Silicon Image Medley software RAID (EXPERIMENTAL)' CONFIG_BLK_DEV_ATARAID_SII $CONFIG_BLK_DEV_IDE $CONFIG_EXPERIMENTAL $CONFIG_BLK_DEV_ATARAID
+dep_tristate '   Support for Intel software RAID (EXPERIMENTAL)' CONFIG_BLK_DEV_ATARAID_ISW $CONFIG_BLK_DEV_IDE $CONFIG_EXPERIMENTAL $CONFIG_BLK_DEV_SD $CONFIG_BLK_DEV_ATARAID
 
 endmenu
diff -uNr linux-2.4.22/drivers/ide/raid/iswraid.c linux-2.4.22-isw/drivers/ide/raid/iswraid.c
--- linux-2.4.22/drivers/ide/raid/iswraid.c	1969-12-31 17:00:00.000000000 -0700
+++ linux-2.4.22-isw/drivers/ide/raid/iswraid.c	2003-09-24 16:12:03.000000000 -0700
@@ -0,0 +1,1070 @@
+/*
+ *   iswraid.c Copyright (C) 2003,2004 Intel Corporation. 
+ *   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, or (at your option)
+ *   any later version.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   (for example /usr/src/linux/COPYING); if not, write to the Free
+ *   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *   
+ *   Authors: Boji Tony Kannanthanam 
+ *            < boji dot t dot kannanthanam at intel dot com>
+ *   Based on ataraid codebase by Arjan van de Ven
+ *   
+ *   
+ */
+
+/*
+ * "iswraid" is an ataraid subdriver for Intel's ICH5R chipset.
+ * The "ataraid" module needs to be loaded before this driver
+ * can load. 
+ * This subdriver differs from the other ataraid subdriver in that 
+ * it depends on a SCSI low level driver to access RAID member
+ * disks instead of the ATA/IDE subsystem.
+ * Hence, you will also need the "ata_piix" driver which detects 
+ * the SATA drives connected to ICH5R as SCSI devices (sda, sdb...)
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+#include <linux/genhd.h>
+#include <linux/ioctl.h>
+#include <scsi/scsi.h>
+
+#include <linux/ide.h>
+#include <asm/uaccess.h>
+
+#include "../../scsi/scsi.h"
+#include <scsi/scsi_ioctl.h>
+#include "ataraid.h"
+#include "iswraid.h"
+
+//#define DRIVERDEBUG = 1
+
+#ifdef DRIVERDEBUG
+#define DEBUG(s, args...) printk(s, ## args)
+#else
+#define DEBUG(s, args...)
+#endif
+
+#define ICH_VERSION_STRING        "Version 0.0.6"
+
+static int iswraid_open(struct inode *inode, struct file *filp);
+static int iswraid_release(struct inode *inode, struct file *filp);
+static int iswraid_ioctl(struct inode *inode, struct file *file,
+			 unsigned int cmd, unsigned long arg);
+static int iswraid0_make_request(request_queue_t * q, int rw,
+				 struct buffer_head *bh);
+static int iswraid1_make_request(request_queue_t * q, int rw,
+				 struct buffer_head *bh);
+
+struct disk_dev {
+	int major;
+	int minor;
+	int device;
+	struct disk_dev *next;
+};
+
+struct disk_dev *devlist = NULL;
+
+struct ichdisk {
+	kdev_t device;
+	unsigned long sectors;
+	struct block_device *bdev;
+	unsigned long last_pos;
+};
+
+#define MAX_RAID_MEMBER_DISKS 8
+#define MAX_RAID_VOLUMES 16
+
+struct iswraid {
+	unsigned int stride;
+	unsigned int disks;
+	unsigned long sectors;
+	struct geom geom;
+
+	struct ichdisk disk[MAX_RAID_MEMBER_DISKS];
+
+	unsigned long cutoff[MAX_RAID_MEMBER_DISKS];
+	unsigned int cutoff_disks[MAX_RAID_MEMBER_DISKS];
+	int refcnt;
+};
+
+static struct raid_device_operations iswraid0_ops = {
+      open:iswraid_open,
+      release:iswraid_release,
+      ioctl:iswraid_ioctl,
+      make_request:iswraid0_make_request
+};
+
+static struct raid_device_operations iswraid1_ops = {
+      open:iswraid_open,
+      release:iswraid_release,
+      ioctl:iswraid_ioctl,
+      make_request:iswraid1_make_request
+};
+
+static struct iswraid raid[MAX_RAID_VOLUMES];
+
+static DECLARE_MUTEX(iswraid_sem);
+
+static int
+iswraid_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+	      unsigned long arg)
+{
+	unsigned int minor;
+	unsigned long sectors;
+
+	if (!inode || !inode->i_rdev)
+		return -EINVAL;
+
+	minor = MINOR(inode->i_rdev) >> SHIFT;
+
+	switch (cmd) {
+
+	case BLKGETSIZE:	/* Return device size */
+		{
+			if (!arg)
+				return -EINVAL;
+			sectors =
+			    ataraid_gendisk.part[MINOR(inode->i_rdev)].nr_sects;
+			if (MINOR(inode->i_rdev) & 15)
+				return put_user(sectors, (unsigned long *) arg);
+			return put_user(raid[minor].sectors,
+					(unsigned long *) arg);
+			break;
+		}
+
+	case HDIO_GETGEO:
+		{
+			struct hd_geometry *loc = (struct hd_geometry *) arg;
+			unsigned short bios_cyl = raid[minor].geom.cylinders;	/* truncate */
+
+			if (!loc)
+				return -EINVAL;
+			if (put_user
+			    (raid[minor].geom.heads, (byte *) & loc->heads))
+				return -EFAULT;
+			if (put_user
+			    (raid[minor].geom.sectors, (byte *) & loc->sectors))
+				return -EFAULT;
+			if (put_user
+			    (bios_cyl, (unsigned short *) &loc->cylinders))
+				return -EFAULT;
+			if (put_user
+			    ((unsigned) ataraid_gendisk.
+			     part[MINOR(inode->i_rdev)].start_sect,
+			     (unsigned long *) &loc->start))
+				return -EFAULT;
+			return 0;
+		}
+
+	case HDIO_GETGEO_BIG:
+		{
+			struct hd_big_geometry *loc =
+			    (struct hd_big_geometry *) arg;
+			if (!loc)
+				return -EINVAL;
+			if (put_user
+			    (raid[minor].geom.heads, (byte *) & loc->heads))
+				return -EFAULT;
+			if (put_user
+			    (raid[minor].geom.sectors, (byte *) & loc->sectors))
+				return -EFAULT;
+			if (put_user
+			    (raid[minor].geom.cylinders,
+			     (unsigned int *) &loc->cylinders))
+				return -EFAULT;
+			if (put_user
+			    ((unsigned) ataraid_gendisk.
+			     part[MINOR(inode->i_rdev)].start_sect,
+			     (unsigned long *) &loc->start))
+				return -EFAULT;
+			return 0;
+		}
+
+	case BLKRRPART:
+		{
+			/* Re-Read Partition Table. */
+			DEBUG("iswraid: BLKRRPART. \n");
+			int i;
+			if (!capable(CAP_SYS_ADMIN))
+				return -EACCES;
+
+			down(&iswraid_sem);
+			if (raid[minor].refcnt > 1) {
+				up(&iswraid_sem);
+				return -EBUSY;
+			}
+
+			for (i = 0; i < 16; i++) {
+				int m = minor + i;
+				if (ataraid_gendisk.part[m].nr_sects > 0) {
+					invalidate_device(MKDEV
+							  (ataraid_gendisk.
+							   major, m), 1);
+				}
+				/* Clear existing partition sizes.  */
+				ataraid_gendisk.part[m].start_sect = 0;
+				ataraid_gendisk.part[m].nr_sects = 0;
+				/* Reset the Block Size so that the partition table can be read.  */
+				set_blocksize(MKDEV(ataraid_gendisk.major, m),
+					      ICH_DISK_BLOCK_SIZE);
+			}
+			ataraid_register_disk(minor, raid[minor].sectors);
+			up(&iswraid_sem);
+			return 0;
+		}
+	default:
+		return blk_ioctl(inode->i_rdev, cmd, arg);
+	};
+
+	return 0;
+}
+
+static unsigned long
+partition_map_normal(unsigned long block, unsigned long partition_off,
+		     unsigned long partition_size, int stride)
+{
+	return block + partition_off;
+}
+
+static int
+iswraid0_make_request(request_queue_t * q, int rw, struct buffer_head *bh)
+{
+
+	unsigned long rsect;
+	unsigned long rsect_left, rsect_accum = 0;
+	unsigned long block;
+	unsigned int disk = 0, real_disk = 0;
+	int i;
+	int device;
+	struct iswraid *thisraid;
+
+	DEBUG("iswraid: iswraid0_make_request\n");
+	rsect = bh->b_rsector;
+
+	/* Ok. We need to modify this sector number to a new disk + new sector number.
+	 * If there are disks of different sizes, this gets tricky.
+	 * Example with 3 disks (1Gb, 4Gb and 5 GB):
+	 * The first 3 Gb of the "RAID" are evenly spread over the 3 disks.
+	 * Then things get interesting. The next 2Gb (RAID view) are spread across disk 2 and 3
+	 * and the last 1Gb is disk 3 only.
+	 *
+	 * the way this is solved is like this: We have a list of "cutoff" points where everytime
+	 * a disk falls out of the "higher" count, we mark the max sector. So once we pass a cutoff
+	 * point, we have to divide by one less.
+	 */
+
+	device = (bh->b_rdev >> SHIFT) & MAJOR_MASK;
+	thisraid = &raid[device];
+	if (thisraid->stride == 0)
+		thisraid->stride = 1;
+
+	/* Partitions need adding of the start sector of the partition to the requested sector */
+
+	rsect =
+	    partition_map_normal(rsect,
+				 ataraid_gendisk.part[MINOR(bh->b_rdev)].
+				 start_sect,
+				 ataraid_gendisk.part[MINOR(bh->b_rdev)].
+				 nr_sects, thisraid->stride);
+
+	/* Woops we need to split the request to avoid crossing a stride barrier */
+	if ((rsect / thisraid->stride) !=
+	    ((rsect + (bh->b_size / 512) - 1) / thisraid->stride)) {
+		return -1;
+	}
+
+	rsect_left = rsect;
+
+	for (i = 0; i < MAX_RAID_MEMBER_DISKS; i++) {
+		if (thisraid->cutoff_disks[i] == 0)
+			break;
+		if (rsect > thisraid->cutoff[i]) {
+			/* we're in the wrong area so far */
+			rsect_left -= thisraid->cutoff[i];
+			rsect_accum +=
+			    thisraid->cutoff[i] / thisraid->cutoff_disks[i];
+		} else {
+			block = rsect_left / thisraid->stride;
+			disk = block % thisraid->cutoff_disks[i];
+			block =
+			    (block / thisraid->cutoff_disks[i]) *
+			    thisraid->stride;
+			rsect =
+			    rsect_accum + (rsect_left % thisraid->stride) +
+			    block;
+			break;
+		}
+	}
+
+	for (i = 0; i < MAX_RAID_MEMBER_DISKS; i++) {
+		if ((disk == 0) && (thisraid->disk[i].sectors > rsect_accum)) {
+			real_disk = i;
+			break;
+		}
+		if ((disk > 0) && (thisraid->disk[i].sectors >= rsect_accum)) {
+			disk--;
+		}
+	}
+	disk = real_disk;
+	/*
+	 * The new BH_Lock semantics in ll_rw_blk.c guarantee that this
+	 * is the only IO operation happening on this bh.
+	 */
+	bh->b_rdev = thisraid->disk[disk].device;
+	bh->b_rsector = rsect;
+
+	/*
+	 * Let the main block layer submit the IO and resolve recursion:
+	 */
+	return 1;
+
+}
+
+static int
+iswraid1_write_request(request_queue_t * q, int rw, struct buffer_head *bh)
+{
+	struct buffer_head *bh1;
+	struct ataraid_bh_private *private;
+	int device;
+	int i;
+
+	DEBUG("iswraid: iswraid1_write_request\n");
+
+	device = (bh->b_rdev >> SHIFT) & MAJOR_MASK;
+	private = ataraid_get_private();
+	if (private == NULL)
+		BUG();
+
+	private->parent = bh;
+
+	atomic_set(&private->count, raid[device].disks);
+
+	for (i = 0; i < raid[device].disks; i++) {
+		bh1 = ataraid_get_bhead();
+		/* If this ever fails we're doomed */
+		if (!bh1)
+			BUG();
+
+		/* dupe the bufferhead and update the parts that need to be different */
+		memcpy(bh1, bh, sizeof (*bh));
+
+		bh1->b_end_io = ataraid_end_request;
+		bh1->b_private = private;
+		bh1->b_rsector += ataraid_gendisk.part[MINOR(bh->b_rdev)].start_sect;	/* partition offset */
+		bh1->b_rdev = raid[device].disk[i].device;
+
+		/* update the last known head position for the drive */
+		raid[device].disk[i].last_pos =
+		    bh1->b_rsector + (bh1->b_size >> 9);
+
+		generic_make_request(rw, bh1);
+	}
+	return 0;
+}
+
+static int
+iswraid1_read_request(request_queue_t * q, int rw, struct buffer_head *bh)
+{
+	int device;
+	int dist;
+	int bestsofar, bestdist, i;
+	static int previous;
+
+	DEBUG("iswraid: iswraid1_read_request\n");
+
+	/* Reads are simple in principle. Pick a disk and go.
+	 * Initially I cheat by just picking the one which the last known
+	 * head position is closest by.
+	 * Later on, online/offline checking and performance needs adding 
+	 */
+
+	device = (bh->b_rdev >> SHIFT) & MAJOR_MASK;
+	bh->b_rsector += ataraid_gendisk.part[MINOR(bh->b_rdev)].start_sect;
+
+	bestsofar = 0;
+	bestdist = raid[device].disk[0].last_pos - bh->b_rsector;
+	if (bestdist < 0)
+		bestdist = -bestdist;
+	if (bestdist > 4095)
+		bestdist = 4095;
+
+	for (i = 1; i < raid[device].disks; i++) {
+		dist = raid[device].disk[i].last_pos - bh->b_rsector;
+		if (dist < 0)
+			dist = -dist;
+		if (dist > 4095)
+			dist = 4095;
+
+		if (bestdist == dist) {	/* it's a tie; try to do some read balancing */
+			if ((previous > bestsofar) && (previous <= i))
+				bestsofar = i;
+			previous = (previous + 1) % raid[device].disks;
+		} else if (bestdist > dist) {
+			bestdist = dist;
+			bestsofar = i;
+		}
+
+	}
+
+	bh->b_rdev = raid[device].disk[bestsofar].device;
+	raid[device].disk[bestsofar].last_pos =
+	    bh->b_rsector + (bh->b_size >> 9);
+
+	/*
+	 * Let the main block layer submit the IO and resolve recursion:
+	 */
+	return 1;
+}
+
+static int
+iswraid1_make_request(request_queue_t * q, int rw, struct buffer_head *bh)
+{
+	DEBUG("iswraid: iswraid1_make_request\n");
+
+	/* Read and Write are totally different cases; split them totally here */
+	if (rw == READA)
+		rw = READ;
+
+	if (rw == READ)
+		return iswraid1_read_request(q, rw, bh);
+	else
+		return iswraid1_write_request(q, rw, bh);
+
+	return 0;
+}
+
+static unsigned long __init
+calc_ichblock_offset(int major, int minor)
+{
+	unsigned long lba = 0;
+	kdev_t dev;
+	struct gendisk *gdisk;
+
+	DEBUG("iswraid: calc_ichblock_offset\n");
+
+	dev = MKDEV(major, minor);
+	gdisk = get_gendisk(dev);
+
+	if (gdisk == NULL)
+		return 0;
+
+	/* gendisk->sizes are in 1024 sized blocks. Therefore 
+	 * multiplying by 2 to get 512 sized blocks.
+	 */
+	lba = (gdisk->sizes[minor] * 2) - 2;
+	return lba;
+}
+
+static int __init
+read_disk_sb(int major, int minor, unsigned char *buffer, int bufsize,
+	     unsigned long mpb_pos, int mpb_blocks)
+{
+	int ret = -EINVAL;
+	struct buffer_head *bh = NULL;
+	kdev_t dev = MKDEV(major, minor);
+
+	DEBUG("iswraid: read_disk_sb\n");
+
+	if (blksize_size[major] == NULL)	/* device doesn't exist */
+		return -EINVAL;
+
+	set_blocksize(dev, ICH_DISK_BLOCK_SIZE);
+
+	bh = bread(dev, mpb_pos, mpb_blocks * ICH_DISK_BLOCK_SIZE);
+
+	if (bh) {
+		memcpy(buffer, bh->b_data, bufsize);
+	} else {
+		printk(KERN_ERR "iswraid: Error reading superblock.\n");
+		goto abort;
+	}
+	ret = 0;
+      abort:
+	if (bh)
+		brelse(bh);
+	return ret;
+}
+
+/*
+ * Generate checksum of contents of Raid metadata
+ * for mpbSize/sizeof(U32) words
+ */
+static u32 __init
+compute_checksum(u32 * buffer, u32 mpbSize)
+{
+	u32 i;
+	u32 sum = 0;
+	DEBUG("iswraid: compute_checksum\n");
+	for (i = 0; i < (mpbSize / sizeof (u32)); i++)
+		sum += *buffer++;
+	DEBUG("iswraid: checksum calculated from metadata is%lu \n", sum);
+	return sum;
+}
+
+/*
+ * The raid member disks are scsi devices. We do an inquiry to
+ * to determine the disk serial number. This information is used
+ * to order the member disks correctly in the raid array.
+ */
+static int __init
+iswraid_do_inquiry(int major, int minor, unsigned char *ich_serial_no)
+{
+	kdev_t dev;
+	int i, retval;
+	unsigned char *cmd;
+	unsigned char *resppage;
+	unsigned char buffer[1024];
+	Scsi_Device *SDpnt;
+
+	DEBUG("iswraid: iswraid_do_inquiry\n");
+
+	if (blksize_size[major] == NULL)	/* device doesn't exist */
+		return -EINVAL;
+
+	dev = MKDEV(major, minor);
+
+	SDpnt = blk_dev[MAJOR(dev)].queue(dev)->queuedata;
+
+	if (SDpnt == NULL)
+		return -1;
+
+	for (i = 0; i < 1024; i++)
+		buffer[i] = 0;
+
+	/* input data size. No input. */
+	*((int *) buffer) = 0;
+	/* output buffer size.. */
+	*(((int *) buffer) + 1) = 1024;
+	/* cmd is the SCSI command to send */
+	cmd = (char *) (((int *) buffer) + 2);
+
+	cmd[0] = 0x12;		/* Opcode INQUIRY=12h */
+	cmd[1] = 0x01;		/* EVPD=1. Return the vital product data specified in page code */
+	cmd[2] = 0x80;		/* Page Code Unit serial number page=80h */
+	cmd[3] = 0x00;		/* Reserved byte */
+	cmd[4] = 0xff;		/* allocation length */
+	cmd[5] = 0x00;		/* Control  byte */
+	retval = kernel_scsi_ioctl(SDpnt, SCSI_IOCTL_SEND_COMMAND, buffer);
+	if (retval) {
+		printk(KERN_INFO
+		       "iswraid: ERROR kernel_scsi_ioctl(SCSI_IOCTL_SEND_COMMAND) failed. code= %d\n",
+		       retval);
+		return -1;
+	}
+
+	/* VPD page is at location resppage */
+	resppage = buffer + 8;
+	/* Third byte is Page Length */
+	for (i = 0; i < resppage[3]; i++) {
+		if (resppage[4 + i] != ' ')
+			ich_serial_no[i] = resppage[4 + i];
+		else {
+			ich_serial_no[i] = '\0';
+			break;
+		}
+	}
+	return 0;
+}
+
+/* Used to hold the RAID volume identifier and to distinguish
+ * between RAID arrays of same type.
+ */
+static u32 RaidID = 0;
+
+static void __init
+probedisk(struct disk_dev *rdisk, int device, int raidlevel)
+{
+	int i = 0;
+	struct _RaidMpb *mpb;
+	unsigned long sb_offset;
+	int sigLen = 0;
+	static unsigned char block[4096];
+	static unsigned char block2[2048];
+	struct block_device *bdev;
+	int major, minor;
+
+	DEBUG("iswraid: probedisk for RAID level %d \n", raidlevel);
+
+	/* already assigned to another array */
+	if (rdisk->device != -1)
+		return;
+
+	major = rdisk->major;
+	minor = rdisk->minor;
+
+	/*
+	 * Calculate the position of the block containing
+	 * the first block of raid metadata.
+	 */
+	sb_offset = calc_ichblock_offset(major, minor);
+
+	if (sb_offset == 0)
+		return;
+
+	/* Read the RAID metadata header */
+	if (read_disk_sb
+	    (major, minor, (unsigned char *) &block, sizeof (block), sb_offset,
+	     1))
+		return;
+
+	mpb = (struct _RaidMpb *) &block;
+
+	/* Check Signature and version info */
+	unsigned char ich_raid_signature[MAX_SIGNATURE_LENGTH];
+	strncpy(ich_raid_signature, MPB_SIGNATURE, strlen(MPB_SIGNATURE) + 1);
+	strncat(ich_raid_signature, MPB_VERSION_RAID1,
+		strlen(MPB_VERSION_RAID1) + 1);
+	sigLen = strlen(ich_raid_signature);
+	if (strncmp(mpb->sig.text, ich_raid_signature, sigLen) > 0)
+		return;
+
+	DEBUG("iswraid: Intel RAID Member disk found.\n");
+	DEBUG("iswraid: Major:%d Minor:%d Signature: %s \n", major, minor,
+	      mpb->sig.text);
+
+	//FIXME: The section below should read in all of MPB if > 512. 
+	//Cannot test currently with ICH5R. 
+	if (mpb->mpbSize > 512) {
+		/* OK now to read in the rest of the MPB. First from the 
+		 * size lets figure out how many more sectors.
+		 */
+		DEBUG("iswraid: Size of RAID metadata is %li \n", mpb->mpbSize);
+		int TotalBlocks = (mpb->mpbSize) / ICH_DISK_BLOCK_SIZE;
+		if (TotalBlocks > 1) {
+			//For ICH5R we will most probably won't go here.
+			DEBUG
+			    ("iswraid: Total blocks: %d, read %d blocks starting from %li \n",
+			     TotalBlocks, TotalBlocks - 1,
+			     sb_offset - (TotalBlocks - 1));
+			if (read_disk_sb
+			    (major, minor, (unsigned char *) &block2,
+			     sizeof (block2), sb_offset - (TotalBlocks - 1),
+			     (TotalBlocks - 1))) {
+				DEBUG
+				    ("iswraid: failed to read rest of RAID metadata\n");
+				return;
+			}
+			memcpy(&block[ICH_DISK_BLOCK_SIZE], block2,
+			       sizeof (block2) - ICH_DISK_BLOCK_SIZE);
+		}
+	}
+
+	/* Compare checksum read from MPB with newly calculated value */
+
+	u32 checksum = mpb->checkSum;
+	mpb->checkSum = 0;
+	if (checksum != compute_checksum((u32 *) mpb, mpb->mpbSize)) {
+		printk("iswraid: ERROR: checksum did not match\n");
+		return;
+	}
+
+	DEBUG("iswraid: Found an Intel Raid volume: \n");
+	DEBUG("iswraid:    Contains %d member disks\n", mpb->numDisks);
+
+	/* RaidID is used to track whether the disk belongs to the RAID array
+	 * we are currently detecting. Using FamilyNum.
+	 * FIXME: Robust checking, using generationNum in combination with
+	 * familyNum
+	 */
+	if (RaidID == 0)
+		RaidID = mpb->familyNum;
+	else {
+		if (RaidID != mpb->familyNum)
+			return;
+	}
+
+#ifdef DRIVERDEBUG
+	struct _MpbDisk *disk;
+	/* Go thru the RAID member disks information */
+	disk = (struct _MpbDisk *) (mpb->diskTbl);
+
+	for (i = 0; i < mpb->numDisks; i++) {
+		DEBUG("iswraid: Disk %d, Serial %s\n", i,
+		      mpb->diskTbl[i].serial.serial);
+		DEBUG("iswraid: Disk %d: total blocks %lu SCSI ID %d \n", i,
+		      disk->totalBlocks, disk->scsiId);
+		DEBUG("iswraid:          Serial %s \n", disk->serial.serial);
+		disk =
+		    (struct _MpbDisk *) ((unsigned long) disk +
+					 (unsigned long) sizeof (struct
+								 _MpbDisk));
+	}
+#endif
+
+	/* Go thru the RAID DEV structure */
+	struct _MpbRaidDev *raiddev;
+	i = mpb->numDisks;
+	raiddev = (struct _MpbRaidDev *) (&mpb->diskTbl[i]);
+
+	DEBUG("iswraid: Name of the RAID volume %s \n", raiddev->serial.serial);
+	DEBUG("iswraid:  RAID volume State %lu \n", raiddev->status);
+
+	/* Parse RAID metadata for relevant information */
+	struct _MpbRaidVol *vol;
+	vol = &raiddev->raidVol;
+
+#ifdef DRIVERDEBUG
+	if (vol->migrState != 0) {
+		DEBUG("iswraid: RAID Volume %s is in migrating state\n",
+		      raiddev->serial.serial);
+	}
+#endif
+
+	struct _MpbRaidMap *map;
+	map = &vol->loMap;
+
+	/* different raidlevel. Not now... later */
+	if (map->raidLevel != raidlevel)
+		return;
+
+	/* We do not attempt to do any kind of error recovery on
+	 * RAID array errors. Just do not claim arrays which are
+	 * in abnormal state. Use Option ROM or config utility to
+	 * fix for now.
+	 */
+	if (map->mapState != 0) {
+		printk(KERN_INFO "iswraid: RAID volume not in normal state.\n");
+		printk(KERN_INFO "iswraid: Ignoring this RAID volume.\n");
+		return;
+	}
+
+	/* OK, now we need to uniquely match this disk to one of the 
+	 * RAID member disk (since order of the disks in the array is
+	 * important. Use Disk serial number for this purpose.
+	 */
+	static unsigned char ich_disk_serial[32];
+	if (iswraid_do_inquiry(major, minor, (unsigned char *) &ich_disk_serial)
+	    != 0) {
+		printk(KERN_INFO "iswraid: inquiry returned error\n");
+		return;
+	}
+
+	DEBUG
+	    ("iswraid: For disk with major:%d and minor %d, Serial number is %s\n",
+	     major, minor, ich_disk_serial);
+
+	for (i = 0; i < mpb->numDisks; i++) {
+		if (strcmp
+		    (ich_disk_serial,
+		     mpb->diskTbl[map->diskOrdTbl[i]].serial.serial) == 0) {
+			DEBUG
+			    ("iswraid: This disk %s is the %d th disk in array\n",
+			     ich_disk_serial, i);
+			break;
+		}
+	}
+
+	if (i == mpb->numDisks)
+		return;
+
+	/* We have all the info. Lets fill in the ataraid structure */
+	bdev = bdget(MKDEV(major, minor));
+	if (bdev
+	    && blkdev_get(bdev, FMODE_READ | FMODE_WRITE, 0, BDEV_RAW) == 0)
+		raid[device].disk[i].bdev = bdev;
+
+	//FIXME: claim this device so that use cannot access RAID member disk.
+	DEBUG
+	    ("iswraid: blocksPerMember= %lu blocksPerStrip=%lu numDataStripes=%lu\n",
+	     map->blocksPerMember, map->blocksPerStrip, map->numDataStripes);
+	raid[device].disk[i].device = MKDEV(major, minor);
+	raid[device].disk[i].sectors = map->blocksPerMember;
+	raid[device].stride = map->blocksPerStrip;
+	raid[device].disks = map->numMembers;
+	raid[device].sectors = raiddev->numDataBlocksLo;
+	raid[device].geom.heads = 255;
+	raid[device].geom.sectors = 63;
+	raid[device].geom.cylinders =
+	    raid[device].sectors / raid[device].geom.heads /
+	    raid[device].geom.sectors;
+	DEBUG("iswraid: raid[%d].geom.cylinders %lu \n", device,
+	      raid[device].geom.cylinders);
+
+	rdisk->device = device;
+}
+
+static void __init
+fill_cutoff(int device)
+{
+	int i, j;
+	unsigned long smallest;
+	unsigned long bar;
+	int count;
+
+	bar = 0;
+	for (i = 0; i < MAX_RAID_MEMBER_DISKS; i++) {
+		smallest = ~0;
+		for (j = 0; j < MAX_RAID_MEMBER_DISKS; j++)
+			if ((raid[device].disk[j].sectors < smallest)
+			    && (raid[device].disk[j].sectors > bar))
+				smallest = raid[device].disk[j].sectors;
+		count = 0;
+		for (j = 0; j < MAX_RAID_MEMBER_DISKS; j++)
+			if (raid[device].disk[j].sectors >= smallest)
+				count++;
+
+		smallest = smallest * count;
+		bar = smallest;
+		raid[device].cutoff[i] = smallest;
+		raid[device].cutoff_disks[i] = count;
+	}
+}
+
+static __init int
+iswraid_init_one(int device, int raidlevel)
+{
+	int i, count;
+
+	struct disk_dev *rdisk_p;
+	rdisk_p = devlist;
+	while (rdisk_p != NULL) {
+		DEBUG("iswraid: going to probe disk: major %d and %d \n",
+		      rdisk_p->major, rdisk_p->minor);
+		probedisk(rdisk_p, device, raidlevel);
+		rdisk_p = rdisk_p->next;
+	}
+
+	/* Check that all the RAID members were properly detected 
+	 * There should be raid[device].disks detected and info
+	 * filled in the array. This way we can detect an array
+	 * with missing disk. Overkill ?
+	 */
+	for (i = 0; i < raid[device].disks; i++) {
+		if (raid[device].disk[i].bdev == NULL) {
+			printk(KERN_INFO
+			       "iswraid: ERROR: RAID array missing disk(s).\n");
+			printk(KERN_INFO
+			       "iswraid: ERROR: Not registering this RAID array.\n");
+			/* Clean up */
+			int j;
+			for (j = 0; j < MAX_RAID_MEMBER_DISKS; j++) {
+				struct block_device *bdev =
+				    raid[device].disk[j].bdev;
+				raid[device].disk[j].bdev = NULL;
+				if (bdev)
+					blkdev_put(bdev, BDEV_RAW);
+			}
+			return -ENODEV;
+		}
+	}
+
+	if (raidlevel == 0)
+		fill_cutoff(device);
+
+	/* Initialize the gendisk structure */
+
+	ataraid_register_disk(device, raid[device].sectors);
+
+	count = 0;
+
+	for (i = 0; i < MAX_RAID_MEMBER_DISKS; i++) {
+		if (raid[device].disk[i].device != 0) {
+			printk(KERN_INFO
+			       "iswraid: RAID member drive %i is %li Mb (%i / %i) \n",
+			       i, raid[device].disk[i].sectors / 2048,
+			       MAJOR(raid[device].disk[i].device),
+			       MINOR(raid[device].disk[i].device));
+			count++;
+		}
+	}
+
+	if (count) {
+		printk(KERN_INFO
+		       "iswraid: Raid%i array consists of %i drives. \n",
+		       raidlevel, count);
+		return 0;
+	} else {
+		return -ENODEV;
+	}
+}
+
+static int __init
+detect_devlist(void)
+{
+
+	struct disk_dev *devlist_tmp = NULL;
+	struct block_device *bdev;
+	int major, minor;
+	int dev_count = 0;
+
+	DEBUG("iswraid: detect_devlist: looking for SCSI disks\n");
+
+	major = SCSI_DISK0_MAJOR;
+
+	minor = 0;
+	do {
+		/* This is really a corner case: checking for all possible
+		 * SCSI disks. What are the odds ?
+		 */
+		if (minor > 240) {
+			minor = 0;
+			if (major == SCSI_DISK7_MAJOR)
+				break;
+			if (major == SCSI_DISK0_MAJOR)
+				major = SCSI_DISK1_MAJOR;
+			else
+				major++;
+		}
+
+		bdev = bdget(MKDEV(major, minor));
+		/* Check if it is a valid device */
+		if (bdev
+		    && blkdev_get(bdev, FMODE_READ | FMODE_WRITE, 0,
+				  BDEV_RAW) == 0) {
+			/* a real physical device found, add to devlist */
+
+			devlist_tmp =
+			    kmalloc(sizeof (struct disk_dev), GFP_KERNEL);
+			devlist_tmp->major = major;
+			devlist_tmp->minor = minor;
+			DEBUG
+			    ("iswraid: detect_devlist: Found possible device: major %d and minor %d \n",
+			     major, minor);
+			devlist_tmp->device = -1;
+			devlist_tmp->next = devlist;
+			devlist = devlist_tmp;
+			dev_count++;
+		} else {
+			DEBUG("iswraid: found %d SCSI Devices to probe \n",
+			      dev_count);
+			/* SCSI disks are claimed sequentially. So we can stop searching when
+			 * we encounter the first invalid device.
+			 */
+			break;
+		}
+		minor = minor + 16;
+
+	} while (1);
+
+	return dev_count;
+}
+
+static __init int
+iswraid_init(void)
+{
+	int retval, device, count = 0;
+	int devlist_count = 0;
+	int i, j;
+
+	printk(KERN_INFO "iswraid: Intel(tm) Software RAID driver %s \n",
+	       ICH_VERSION_STRING);
+
+	/* Initialize the raid structure to init values */
+	for (i = 0; i < MAX_RAID_VOLUMES; i++) {
+		raid[i].disks = 0;
+		raid[i].refcnt = 0;
+		for (j = 0; j < MAX_RAID_MEMBER_DISKS; j++) {
+			raid[i].disk[j].bdev = NULL;
+		}
+	}
+
+	devlist_count = detect_devlist();
+
+	if (devlist_count == 0) {
+		DEBUG("iswraid: No SCSI disks found \n");
+		printk(KERN_DEBUG "iswraid: No raid array found\n");
+		return -ENODEV;
+	}
+
+	DEBUG("iswraid: detecting RAID 0 volumes\n");
+	do {
+		RaidID = 0;
+		device = ataraid_get_device(&iswraid0_ops);
+		if (device < 0)
+			break;
+		retval = iswraid_init_one(device, 0);
+		if (retval) {
+			ataraid_release_device(device);
+			break;
+		} else {
+			count++;
+		}
+	} while (1);
+
+	DEBUG("iswraid: detecting RAID 1 volumes\n");
+	do {
+		RaidID = 0;
+		device = ataraid_get_device(&iswraid1_ops);
+		if (device < 0)
+			break;
+		retval = iswraid_init_one(device, 1);
+		if (retval) {
+			ataraid_release_device(device);
+			break;
+		} else {
+			count++;
+		}
+	} while (1);
+
+	if (count) {
+		printk(KERN_INFO "iswraid: Found %d RAID array(s) \n", count);
+		return 0;
+	}
+	printk(KERN_DEBUG "iswraid: No raid array found\n");
+	return -ENODEV;
+}
+
+static void __exit
+iswraid_exit(void)
+{
+	int i, device;
+	for (device = 0; device < MAX_RAID_VOLUMES; device++) {
+		for (i = 0; i < MAX_RAID_MEMBER_DISKS; i++) {
+			struct block_device *bdev = raid[device].disk[i].bdev;
+			raid[device].disk[i].bdev = NULL;
+			if (bdev)
+				blkdev_put(bdev, BDEV_RAW);
+		}
+		raid[device].refcnt = 0;
+		if (raid[device].sectors)
+			ataraid_release_device(device);
+	}
+}
+
+static int
+iswraid_open(struct inode *inode, struct file *filp)
+{
+	MOD_INC_USE_COUNT;
+	unsigned int minor;
+
+	if (!inode || !inode->i_rdev)
+		return -EINVAL;
+
+	minor = MINOR(inode->i_rdev) >> SHIFT;
+	down(&iswraid_sem);
+	raid[minor].refcnt++;
+	up(&iswraid_sem);
+
+	return 0;
+}
+static int
+iswraid_release(struct inode *inode, struct file *filp)
+{
+	MOD_DEC_USE_COUNT;
+	unsigned int minor;
+	if (!inode || !inode->i_rdev)
+		return -EINVAL;
+
+	minor = MINOR(inode->i_rdev) >> SHIFT;
+	down(&iswraid_sem);
+	raid[minor].refcnt--;
+	up(&iswraid_sem);
+
+	return 0;
+}
+
+module_init(iswraid_init);
+module_exit(iswraid_exit);
+MODULE_LICENSE("GPL");
diff -uNr linux-2.4.22/drivers/ide/raid/iswraid.h linux-2.4.22-isw/drivers/ide/raid/iswraid.h
--- linux-2.4.22/drivers/ide/raid/iswraid.h	1969-12-31 17:00:00.000000000 -0700
+++ linux-2.4.22-isw/drivers/ide/raid/iswraid.h	2003-09-24 12:22:51.000000000 -0700
@@ -0,0 +1,98 @@
+/*
+ * iswraid.h Copyright (c) 2003,2004 Intel  Corporation
+ * 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, or (at your option)
+ *   any later version.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   (for example /usr/src/linux/COPYING); if not, write to the Free
+ *   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Author(s): Boji Tony Kannanthanam 
+ *          < boji dot t dot kannanthanam at intel dot com>
+ *
+ */
+
+//                           "12345678901234567890123456789012"
+#define MPB_SIGNATURE	     "Intel Raid ISM Cfg Sig. "
+#define MPB_VERSION_RAID0                             "1.0.00"
+#define MPB_VERSION_RAID1                             "1.1.00"
+#define MAX_SIGNATURE_LENGTH 32
+#define MAX_RAID_SERIAL_LEN  16
+#define ICH_DISK_BLOCK_SIZE	512
+
+struct MpbSerial {
+	char serial[MAX_RAID_SERIAL_LEN];
+};
+
+/* DISK CONFIGURATION INFO */
+struct _MpbDisk {
+	struct MpbSerial serial;	// ascii serial number
+	u32 totalBlocks;	// total blocks
+	u32 scsiId;		// scsi ID
+	u32 status;		// Same as Disk.status
+#define	MPB_DISK_FILLERS	(5)	// filler space reserved for
+	u32 filler[MPB_DISK_FILLERS];	//   future expansion
+};
+
+/*	RAID MAP CONFIGURATION INFO */
+struct _MpbRaidMap {
+
+	u32 pbaOfLba0;		// start address of partition
+	u32 blocksPerMember;	// blocks per member
+	u32 numDataStripes;	// number of data stripes
+	u16 blocksPerStrip;
+	u8 mapState;		// Normal, Uninitialized, Degraded, Failed
+	u8 raidLevel;		// 0, 1
+	u8 numMembers;		// number of member disks
+	u8 reserved[3];
+#define MPB_RAID_MAP_FILLERS	(7)	// expansion area
+	u32 filler[MPB_RAID_MAP_FILLERS];	// expansion area
+	u32 diskOrdTbl[1];
+};
+
+/* RAID VOLUME INFO */
+
+struct _MpbRaidVol {
+	u32 reserved[2];
+	u8 migrState;		// Normal or Migrating
+	u8 migrType;		// Initializing, Rebuilding, ...
+	u8 dirty;
+	u8 fill[1];
+#define	MPB_RAID_VOL_FILLERS	(5)	// expansion area keeps the loMap
+	u32 filler[MPB_RAID_VOL_FILLERS];
+	struct _MpbRaidMap loMap;
+};
+
+/* RAID DEVICE CONFIGURATION INFO */
+struct _MpbRaidDev {
+	struct MpbSerial serial;	// serial number
+	u32 numDataBlocksLo;	// Data blocks on device (low 32 bits)
+	u32 numDataBlocksHi;	// Data blocks on device (high 32 bits)
+	u32 status;		// Persistent RaidDev status
+	u32 reservedBlocks;	// Reserved blocks at beginning of volume
+#define	MPB_RAID_DEV_FILLERS	(12)
+	u32 filler[MPB_RAID_DEV_FILLERS];
+	struct _MpbRaidVol raidVol;
+};
+
+struct RaidCfgSig {
+	char text[MAX_SIGNATURE_LENGTH];
+};
+
+struct _RaidMpb {
+	struct RaidCfgSig sig;
+	u32 checkSum;		// MPB Checksum
+	u32 mpbSize;		// Size of MPB
+	u32 familyNum;		// Checksum from first time this config was written
+	u32 generationNum;
+	u32 reserved[2];
+	u8 numDisks;		// Number of configured disks
+	u8 fill[3];
+#define RAID_MPB_FILLERS	(39)
+	u32 filler[RAID_MPB_FILLERS];
+	struct _MpbDisk diskTbl[1];
+};
diff -uNr linux-2.4.22/drivers/ide/raid/Makefile linux-2.4.22-isw/drivers/ide/raid/Makefile
--- linux-2.4.22/drivers/ide/raid/Makefile	2003-06-13 07:51:34.000000000 -0700
+++ linux-2.4.22-isw/drivers/ide/raid/Makefile	2003-09-24 12:22:35.000000000 -0700
@@ -13,6 +13,7 @@
 obj-$(CONFIG_BLK_DEV_ATARAID_PDC)	+= pdcraid.o
 obj-$(CONFIG_BLK_DEV_ATARAID_HPT)	+= hptraid.o
 obj-$(CONFIG_BLK_DEV_ATARAID_SII)	+= silraid.o
+obj-$(CONFIG_BLK_DEV_ATARAID_ISW)	+= iswraid.o
 
 EXTRA_CFLAGS	:= -I../