Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1112 insertions, 0 deletions

diff --git a/drivers/block/xd.c b/drivers/block/xd.c
new file mode 100644
index 000000000000..1676033da6c6
--- /dev/null
+++ b/drivers/block/xd.c
@@ -0,0 +1,1112 @@
+/*
+ * This file contains the driver for an XT hard disk controller
+ * (at least the DTC 5150X) for Linux.
+ *
+ * Author: Pat Mackinlay, pat@it.com.au
+ * Date: 29/09/92
+ * 
+ * Revised: 01/01/93, ...
+ *
+ * Ref: DTC 5150X Controller Specification (thanks to Kevin Fowler,
+ *   kevinf@agora.rain.com)
+ * Also thanks to: Salvador Abreu, Dave Thaler, Risto Kankkunen and
+ *   Wim Van Dorst.
+ *
+ * Revised: 04/04/94 by Risto Kankkunen
+ *   Moved the detection code from xd_init() to xd_geninit() as it needed
+ *   interrupts enabled and Linus didn't want to enable them in that first
+ *   phase. xd_geninit() is the place to do these kinds of things anyway,
+ *   he says.
+ *
+ * Modularized: 04/10/96 by Todd Fries, tfries@umr.edu
+ *
+ * Revised: 13/12/97 by Andrzej Krzysztofowicz, ankry@mif.pg.gda.pl
+ *   Fixed some problems with disk initialization and module initiation.
+ *   Added support for manual geometry setting (except Seagate controllers)
+ *   in form:
+ *      xd_geo=<cyl_xda>,<head_xda>,<sec_xda>[,<cyl_xdb>,<head_xdb>,<sec_xdb>]
+ *   Recovered DMA access. Abridged messages. Added support for DTC5051CX,
+ *   WD1002-27X & XEBEC controllers. Driver uses now some jumper settings.
+ *   Extended ioctl() support.
+ *
+ * Bugfix: 15/02/01, Paul G. - inform queue layer of tiny xd_maxsect.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/genhd.h>
+#include <linux/hdreg.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/dma.h>
+
+#include "xd.h"
+
+static void __init do_xd_setup (int *integers);
+#ifdef MODULE
+static int xd[5] = { -1,-1,-1,-1, };
+#endif
+
+#define XD_DONT_USE_DMA		0  /* Initial value. may be overriden using
+				      "nodma" module option */
+#define XD_INIT_DISK_DELAY	(30*HZ/1000)  /* 30 ms delay during disk initialization */
+
+/* Above may need to be increased if a problem with the 2nd drive detection
+   (ST11M controller) or resetting a controller (WD) appears */
+
+static XD_INFO xd_info[XD_MAXDRIVES];
+
+/* If you try this driver and find that your card is not detected by the driver at bootup, you need to add your BIOS
+   signature and details to the following list of signatures. A BIOS signature is a string embedded into the first
+   few bytes of your controller's on-board ROM BIOS. To find out what yours is, use something like MS-DOS's DEBUG
+   command. Run DEBUG, and then you can examine your BIOS signature with:
+
+	d xxxx:0000
+
+   where xxxx is the segment of your controller (like C800 or D000 or something). On the ASCII dump at the right, you should
+   be able to see a string mentioning the manufacturer's copyright etc. Add this string into the table below. The parameters
+   in the table are, in order:
+
+	offset			; this is the offset (in bytes) from the start of your ROM where the signature starts
+	signature		; this is the actual text of the signature
+	xd_?_init_controller	; this is the controller init routine used by your controller
+	xd_?_init_drive		; this is the drive init routine used by your controller
+
+   The controllers directly supported at the moment are: DTC 5150x, WD 1004A27X, ST11M/R and override. If your controller is
+   made by the same manufacturer as one of these, try using the same init routines as they do. If that doesn't work, your
+   best bet is to use the "override" routines. These routines use a "portable" method of getting the disk's geometry, and
+   may work with your card. If none of these seem to work, try sending me some email and I'll see what I can do <grin>.
+
+   NOTE: You can now specify your XT controller's parameters from the command line in the form xd=TYPE,IRQ,IO,DMA. The driver
+   should be able to detect your drive's geometry from this info. (eg: xd=0,5,0x320,3 is the "standard"). */
+
+#include <asm/page.h>
+#define xd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL,get_order(size))
+#define xd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
+static char *xd_dma_buffer;
+
+static XD_SIGNATURE xd_sigs[] __initdata = {
+	{ 0x0000,"Override geometry handler",NULL,xd_override_init_drive,"n unknown" }, /* Pat Mackinlay, pat@it.com.au */
+	{ 0x0008,"[BXD06 (C) DTC 17-MAY-1985]",xd_dtc_init_controller,xd_dtc5150cx_init_drive," DTC 5150CX" }, /* Andrzej Krzysztofowicz, ankry@mif.pg.gda.pl */
+	{ 0x000B,"CRD18A   Not an IBM rom. (C) Copyright Data Technology Corp. 05/31/88",xd_dtc_init_controller,xd_dtc_init_drive," DTC 5150X" }, /* Todd Fries, tfries@umr.edu */
+	{ 0x000B,"CXD23A Not an IBM ROM (C)Copyright Data Technology Corp 12/03/88",xd_dtc_init_controller,xd_dtc_init_drive," DTC 5150X" }, /* Pat Mackinlay, pat@it.com.au */
+	{ 0x0008,"07/15/86(C) Copyright 1986 Western Digital Corp.",xd_wd_init_controller,xd_wd_init_drive," Western Dig. 1002-27X" }, /* Andrzej Krzysztofowicz, ankry@mif.pg.gda.pl */
+	{ 0x0008,"06/24/88(C) Copyright 1988 Western Digital Corp.",xd_wd_init_controller,xd_wd_init_drive," Western Dig. WDXT-GEN2" }, /* Dan Newcombe, newcombe@aa.csc.peachnet.edu */
+	{ 0x0015,"SEAGATE ST11 BIOS REVISION",xd_seagate_init_controller,xd_seagate_init_drive," Seagate ST11M/R" }, /* Salvador Abreu, spa@fct.unl.pt */
+	{ 0x0010,"ST11R BIOS",xd_seagate_init_controller,xd_seagate_init_drive," Seagate ST11M/R" }, /* Risto Kankkunen, risto.kankkunen@cs.helsinki.fi */
+	{ 0x0010,"ST11 BIOS v1.7",xd_seagate_init_controller,xd_seagate_init_drive," Seagate ST11R" }, /* Alan Hourihane, alanh@fairlite.demon.co.uk */
+	{ 0x1000,"(c)Copyright 1987 SMS",xd_omti_init_controller,xd_omti_init_drive,"n OMTI 5520" }, /* Dirk Melchers, dirk@merlin.nbg.sub.org */
+	{ 0x0006,"COPYRIGHT XEBEC (C) 1984",xd_xebec_init_controller,xd_xebec_init_drive," XEBEC" }, /* Andrzej Krzysztofowicz, ankry@mif.pg.gda.pl */
+	{ 0x0008,"(C) Copyright 1984 Western Digital Corp", xd_wd_init_controller, xd_wd_init_drive," Western Dig. 1002s-wx2" },
+	{ 0x0008,"(C) Copyright 1986 Western Digital Corporation", xd_wd_init_controller, xd_wd_init_drive," 1986 Western Digital" }, /* jfree@sovereign.org */
+};
+
+static unsigned int xd_bases[] __initdata =
+{
+	0xC8000, 0xCA000, 0xCC000,
+	0xCE000, 0xD0000, 0xD2000,
+	0xD4000, 0xD6000, 0xD8000,
+	0xDA000, 0xDC000, 0xDE000,
+	0xE0000
+};
+
+static DEFINE_SPINLOCK(xd_lock);
+
+static struct gendisk *xd_gendisk[2];
+
+static struct block_device_operations xd_fops = {
+	.owner	= THIS_MODULE,
+	.ioctl	= xd_ioctl,
+};
+static DECLARE_WAIT_QUEUE_HEAD(xd_wait_int);
+static u_char xd_drives, xd_irq = 5, xd_dma = 3, xd_maxsectors;
+static u_char xd_override __initdata = 0, xd_type __initdata = 0;
+static u_short xd_iobase = 0x320;
+static int xd_geo[XD_MAXDRIVES*3] __initdata = { 0, };
+
+static volatile int xdc_busy;
+static struct timer_list xd_watchdog_int;
+
+static volatile u_char xd_error;
+static int nodma = XD_DONT_USE_DMA;
+
+static struct request_queue *xd_queue;
+
+/* xd_init: register the block device number and set up pointer tables */
+static int __init xd_init(void)
+{
+	u_char i,controller;
+	unsigned int address;
+	int err;
+
+#ifdef MODULE
+	{
+		u_char count = 0;
+		for (i = 4; i > 0; i--)
+			if (((xd[i] = xd[i-1]) >= 0) && !count)
+				count = i;
+		if ((xd[0] = count))
+			do_xd_setup(xd);
+	}
+#endif
+
+	init_timer (&xd_watchdog_int); xd_watchdog_int.function = xd_watchdog;
+
+	if (!xd_dma_buffer)
+		xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
+	if (!xd_dma_buffer) {
+		printk(KERN_ERR "xd: Out of memory.\n");
+		return -ENOMEM;
+	}
+
+	err = -EBUSY;
+	if (register_blkdev(XT_DISK_MAJOR, "xd"))
+		goto out1;
+
+	err = -ENOMEM;
+	xd_queue = blk_init_queue(do_xd_request, &xd_lock);
+	if (!xd_queue)
+		goto out1a;
+
+	if (xd_detect(&controller,&address)) {
+
+		printk("Detected a%s controller (type %d) at address %06x\n",
+			xd_sigs[controller].name,controller,address);
+		if (!request_region(xd_iobase,4,"xd")) {
+			printk("xd: Ports at 0x%x are not available\n",
+				xd_iobase);
+			goto out2;
+		}
+		if (controller)
+			xd_sigs[controller].init_controller(address);
+		xd_drives = xd_initdrives(xd_sigs[controller].init_drive);
+		
+		printk("Detected %d hard drive%s (using IRQ%d & DMA%d)\n",
+			xd_drives,xd_drives == 1 ? "" : "s",xd_irq,xd_dma);
+	}
+
+	err = -ENODEV;
+	if (!xd_drives)
+		goto out3;
+
+	for (i = 0; i < xd_drives; i++) {
+		XD_INFO *p = &xd_info[i];
+		struct gendisk *disk = alloc_disk(64);
+		if (!disk)
+			goto Enomem;
+		p->unit = i;
+		disk->major = XT_DISK_MAJOR;
+		disk->first_minor = i<<6;
+		sprintf(disk->disk_name, "xd%c", i+'a');
+		sprintf(disk->devfs_name, "xd/target%d", i);
+		disk->fops = &xd_fops;
+		disk->private_data = p;
+		disk->queue = xd_queue;
+		set_capacity(disk, p->heads * p->cylinders * p->sectors);
+		printk(" %s: CHS=%d/%d/%d\n", disk->disk_name,
+			p->cylinders, p->heads, p->sectors);
+		xd_gendisk[i] = disk;
+	}
+
+	err = -EBUSY;
+	if (request_irq(xd_irq,xd_interrupt_handler, 0, "XT hard disk", NULL)) {
+		printk("xd: unable to get IRQ%d\n",xd_irq);
+		goto out4;
+	}
+
+	if (request_dma(xd_dma,"xd")) {
+		printk("xd: unable to get DMA%d\n",xd_dma);
+		goto out5;
+	}
+
+	/* xd_maxsectors depends on controller - so set after detection */
+	blk_queue_max_sectors(xd_queue, xd_maxsectors);
+
+	for (i = 0; i < xd_drives; i++)
+		add_disk(xd_gendisk[i]);
+
+	return 0;
+
+out5:
+	free_irq(xd_irq, NULL);
+out4:
+	for (i = 0; i < xd_drives; i++)
+		put_disk(xd_gendisk[i]);
+out3:
+	release_region(xd_iobase,4);
+out2:
+	blk_cleanup_queue(xd_queue);
+out1a:
+	unregister_blkdev(XT_DISK_MAJOR, "xd");
+out1:
+	if (xd_dma_buffer)
+		xd_dma_mem_free((unsigned long)xd_dma_buffer,
+				xd_maxsectors * 0x200);
+	return err;
+Enomem:
+	err = -ENOMEM;
+	while (i--)
+		put_disk(xd_gendisk[i]);
+	goto out3;
+}
+
+/* xd_detect: scan the possible BIOS ROM locations for the signature strings */
+static u_char __init xd_detect (u_char *controller, unsigned int *address)
+{
+	int i, j;
+
+	if (xd_override)
+	{
+		*controller = xd_type;
+		*address = 0;
+		return(1);
+	}
+
+	for (i = 0; i < (sizeof(xd_bases) / sizeof(xd_bases[0])); i++) {
+		void __iomem *p = ioremap(xd_bases[i], 0x2000);
+		if (!p)
+			continue;
+		for (j = 1; j < (sizeof(xd_sigs) / sizeof(xd_sigs[0])); j++) {
+			const char *s = xd_sigs[j].string;
+			if (check_signature(p + xd_sigs[j].offset, s, strlen(s))) {
+				*controller = j;
+				xd_type = j;
+				*address = xd_bases[i];
+				iounmap(p);
+				return 1;
+			}
+		}
+		iounmap(p);
+	}
+	return 0;
+}
+
+/* do_xd_request: handle an incoming request */
+static void do_xd_request (request_queue_t * q)
+{
+	struct request *req;
+
+	if (xdc_busy)
+		return;
+
+	while ((req = elv_next_request(q)) != NULL) {
+		unsigned block = req->sector;
+		unsigned count = req->nr_sectors;
+		int rw = rq_data_dir(req);
+		XD_INFO *disk = req->rq_disk->private_data;
+		int res = 0;
+		int retry;
+
+		if (!(req->flags & REQ_CMD)) {
+			end_request(req, 0);
+			continue;
+		}
+		if (block + count > get_capacity(req->rq_disk)) {
+			end_request(req, 0);
+			continue;
+		}
+		if (rw != READ && rw != WRITE) {
+			printk("do_xd_request: unknown request\n");
+			end_request(req, 0);
+			continue;
+		}
+		for (retry = 0; (retry < XD_RETRIES) && !res; retry++)
+			res = xd_readwrite(rw, disk, req->buffer, block, count);
+		end_request(req, res);	/* wrap up, 0 = fail, 1 = success */
+	}
+}
+
+/* xd_ioctl: handle device ioctl's */
+static int xd_ioctl (struct inode *inode,struct file *file,u_int cmd,u_long arg)
+{
+	XD_INFO *p = inode->i_bdev->bd_disk->private_data;
+
+	switch (cmd) {
+		case HDIO_GETGEO:
+		{
+			struct hd_geometry g;
+			struct hd_geometry __user *geom= (void __user *)arg;
+			g.heads = p->heads;
+			g.sectors = p->sectors;
+			g.cylinders = p->cylinders;
+			g.start = get_start_sect(inode->i_bdev);
+			return copy_to_user(geom, &g, sizeof(g)) ? -EFAULT : 0;
+		}
+		case HDIO_SET_DMA:
+			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
+			if (xdc_busy) return -EBUSY;
+			nodma = !arg;
+			if (nodma && xd_dma_buffer) {
+				xd_dma_mem_free((unsigned long)xd_dma_buffer,
+						xd_maxsectors * 0x200);
+				xd_dma_buffer = NULL;
+			} else if (!nodma && !xd_dma_buffer) {
+				xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
+				if (!xd_dma_buffer) {
+					nodma = XD_DONT_USE_DMA;
+					return -ENOMEM;
+				}
+			}
+			return 0;
+		case HDIO_GET_DMA:
+			return put_user(!nodma, (long __user *) arg);
+		case HDIO_GET_MULTCOUNT:
+			return put_user(xd_maxsectors, (long __user *) arg);
+		default:
+			return -EINVAL;
+	}
+}
+
+/* xd_readwrite: handle a read/write request */
+static int xd_readwrite (u_char operation,XD_INFO *p,char *buffer,u_int block,u_int count)
+{
+	int drive = p->unit;
+	u_char cmdblk[6],sense[4];
+	u_short track,cylinder;
+	u_char head,sector,control,mode = PIO_MODE,temp;
+	char **real_buffer;
+	register int i;
+	
+#ifdef DEBUG_READWRITE
+	printk("xd_readwrite: operation = %s, drive = %d, buffer = 0x%X, block = %d, count = %d\n",operation == READ ? "read" : "write",drive,buffer,block,count);
+#endif /* DEBUG_READWRITE */
+
+	spin_unlock_irq(&xd_lock);
+
+	control = p->control;
+	if (!xd_dma_buffer)
+		xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
+	while (count) {
+		temp = count < xd_maxsectors ? count : xd_maxsectors;
+
+		track = block / p->sectors;
+		head = track % p->heads;
+		cylinder = track / p->heads;
+		sector = block % p->sectors;
+
+#ifdef DEBUG_READWRITE
+		printk("xd_readwrite: drive = %d, head = %d, cylinder = %d, sector = %d, count = %d\n",drive,head,cylinder,sector,temp);
+#endif /* DEBUG_READWRITE */
+
+		if (xd_dma_buffer) {
+			mode = xd_setup_dma(operation == READ ? DMA_MODE_READ : DMA_MODE_WRITE,(u_char *)(xd_dma_buffer),temp * 0x200);
+			real_buffer = &xd_dma_buffer;
+			for (i=0; i < (temp * 0x200); i++)
+				xd_dma_buffer[i] = buffer[i];
+		}
+		else
+			real_buffer = &buffer;
+
+		xd_build(cmdblk,operation == READ ? CMD_READ : CMD_WRITE,drive,head,cylinder,sector,temp & 0xFF,control);
+
+		switch (xd_command(cmdblk,mode,(u_char *)(*real_buffer),(u_char *)(*real_buffer),sense,XD_TIMEOUT)) {
+			case 1:
+				printk("xd%c: %s timeout, recalibrating drive\n",'a'+drive,(operation == READ ? "read" : "write"));
+				xd_recalibrate(drive);
+				spin_lock_irq(&xd_lock);
+				return (0);
+			case 2:
+				if (sense[0] & 0x30) {
+					printk("xd%c: %s - ",'a'+drive,(operation == READ ? "reading" : "writing"));
+					switch ((sense[0] & 0x30) >> 4) {
+					case 0: printk("drive error, code = 0x%X",sense[0] & 0x0F);
+						break;
+					case 1: printk("controller error, code = 0x%X",sense[0] & 0x0F);
+						break;
+					case 2: printk("command error, code = 0x%X",sense[0] & 0x0F);
+						break;
+					case 3: printk("miscellaneous error, code = 0x%X",sense[0] & 0x0F);
+						break;
+					}
+				}
+				if (sense[0] & 0x80)
+					printk(" - CHS = %d/%d/%d\n",((sense[2] & 0xC0) << 2) | sense[3],sense[1] & 0x1F,sense[2] & 0x3F);
+				/*	reported drive number = (sense[1] & 0xE0) >> 5 */
+				else
+					printk(" - no valid disk address\n");
+				spin_lock_irq(&xd_lock);
+				return (0);
+		}
+		if (xd_dma_buffer)
+			for (i=0; i < (temp * 0x200); i++)
+				buffer[i] = xd_dma_buffer[i];
+
+		count -= temp, buffer += temp * 0x200, block += temp;
+	}
+	spin_lock_irq(&xd_lock);
+	return (1);
+}
+
+/* xd_recalibrate: recalibrate a given drive and reset controller if necessary */
+static void xd_recalibrate (u_char drive)
+{
+	u_char cmdblk[6];
+	
+	xd_build(cmdblk,CMD_RECALIBRATE,drive,0,0,0,0,0);
+	if (xd_command(cmdblk,PIO_MODE,NULL,NULL,NULL,XD_TIMEOUT * 8))
+		printk("xd%c: warning! error recalibrating, controller may be unstable\n", 'a'+drive);
+}
+
+/* xd_interrupt_handler: interrupt service routine */
+static irqreturn_t xd_interrupt_handler(int irq, void *dev_id,
+					struct pt_regs *regs)
+{
+	if (inb(XD_STATUS) & STAT_INTERRUPT) {							/* check if it was our device */
+#ifdef DEBUG_OTHER
+		printk("xd_interrupt_handler: interrupt detected\n");
+#endif /* DEBUG_OTHER */
+		outb(0,XD_CONTROL);								/* acknowledge interrupt */
+		wake_up(&xd_wait_int);	/* and wake up sleeping processes */
+		return IRQ_HANDLED;
+	}
+	else
+		printk("xd: unexpected interrupt\n");
+	return IRQ_NONE;
+}
+
+/* xd_setup_dma: set up the DMA controller for a data transfer */
+static u_char xd_setup_dma (u_char mode,u_char *buffer,u_int count)
+{
+	unsigned long f;
+	
+	if (nodma)
+		return (PIO_MODE);
+	if (((unsigned long) buffer & 0xFFFF0000) != (((unsigned long) buffer + count) & 0xFFFF0000)) {
+#ifdef DEBUG_OTHER
+		printk("xd_setup_dma: using PIO, transfer overlaps 64k boundary\n");
+#endif /* DEBUG_OTHER */
+		return (PIO_MODE);
+	}
+	
+	f=claim_dma_lock();
+	disable_dma(xd_dma);
+	clear_dma_ff(xd_dma);
+	set_dma_mode(xd_dma,mode);
+	set_dma_addr(xd_dma, (unsigned long) buffer);
+	set_dma_count(xd_dma,count);
+	
+	release_dma_lock(f);
+
+	return (DMA_MODE);			/* use DMA and INT */
+}
+
+/* xd_build: put stuff into an array in a format suitable for the controller */
+static u_char *xd_build (u_char *cmdblk,u_char command,u_char drive,u_char head,u_short cylinder,u_char sector,u_char count,u_char control)
+{
+	cmdblk[0] = command;
+	cmdblk[1] = ((drive & 0x07) << 5) | (head & 0x1F);
+	cmdblk[2] = ((cylinder & 0x300) >> 2) | (sector & 0x3F);
+	cmdblk[3] = cylinder & 0xFF;
+	cmdblk[4] = count;
+	cmdblk[5] = control;
+	
+	return (cmdblk);
+}
+
+static void xd_watchdog (unsigned long unused)
+{
+	xd_error = 1;
+	wake_up(&xd_wait_int);
+}
+
+/* xd_waitport: waits until port & mask == flags or a timeout occurs. return 1 for a timeout */
+static inline u_char xd_waitport (u_short port,u_char flags,u_char mask,u_long timeout)
+{
+	u_long expiry = jiffies + timeout;
+	int success;
+
+	xdc_busy = 1;
+	while ((success = ((inb(port) & mask) != flags)) && time_before(jiffies, expiry)) {
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_timeout(1);
+	}
+	xdc_busy = 0;
+	return (success);
+}
+
+static inline u_int xd_wait_for_IRQ (void)
+{
+	unsigned long flags;
+	xd_watchdog_int.expires = jiffies + 8 * HZ;
+	add_timer(&xd_watchdog_int);
+	
+	flags=claim_dma_lock();
+	enable_dma(xd_dma);
+	release_dma_lock(flags);
+	
+	sleep_on(&xd_wait_int);
+	del_timer(&xd_watchdog_int);
+	xdc_busy = 0;
+	
+	flags=claim_dma_lock();
+	disable_dma(xd_dma);
+	release_dma_lock(flags);
+	
+	if (xd_error) {
+		printk("xd: missed IRQ - command aborted\n");
+		xd_error = 0;
+		return (1);
+	}
+	return (0);
+}
+
+/* xd_command: handle all data transfers necessary for a single command */
+static u_int xd_command (u_char *command,u_char mode,u_char *indata,u_char *outdata,u_char *sense,u_long timeout)
+{
+	u_char cmdblk[6],csb,complete = 0;
+
+#ifdef DEBUG_COMMAND
+	printk("xd_command: command = 0x%X, mode = 0x%X, indata = 0x%X, outdata = 0x%X, sense = 0x%X\n",command,mode,indata,outdata,sense);
+#endif /* DEBUG_COMMAND */
+
+	outb(0,XD_SELECT);
+	outb(mode,XD_CONTROL);
+
+	if (xd_waitport(XD_STATUS,STAT_SELECT,STAT_SELECT,timeout))
+		return (1);
+
+	while (!complete) {
+		if (xd_waitport(XD_STATUS,STAT_READY,STAT_READY,timeout))
+			return (1);
+
+		switch (inb(XD_STATUS) & (STAT_COMMAND | STAT_INPUT)) {
+			case 0:
+				if (mode == DMA_MODE) {
+					if (xd_wait_for_IRQ())
+						return (1);
+				} else
+					outb(outdata ? *outdata++ : 0,XD_DATA);
+				break;
+			case STAT_INPUT:
+				if (mode == DMA_MODE) {
+					if (xd_wait_for_IRQ())
+						return (1);
+				} else
+					if (indata)
+						*indata++ = inb(XD_DATA);
+					else
+						inb(XD_DATA);
+				break;
+			case STAT_COMMAND:
+				outb(command ? *command++ : 0,XD_DATA);
+				break;
+			case STAT_COMMAND | STAT_INPUT:
+				complete = 1;
+				break;
+		}
+	}
+	csb = inb(XD_DATA);
+
+	if (xd_waitport(XD_STATUS,0,STAT_SELECT,timeout))					/* wait until deselected */
+		return (1);
+
+	if (csb & CSB_ERROR) {									/* read sense data if error */
+		xd_build(cmdblk,CMD_SENSE,(csb & CSB_LUN) >> 5,0,0,0,0,0);
+		if (xd_command(cmdblk,0,sense,NULL,NULL,XD_TIMEOUT))
+			printk("xd: warning! sense command failed!\n");
+	}
+
+#ifdef DEBUG_COMMAND
+	printk("xd_command: completed with csb = 0x%X\n",csb);
+#endif /* DEBUG_COMMAND */
+
+	return (csb & CSB_ERROR);
+}
+
+static u_char __init xd_initdrives (void (*init_drive)(u_char drive))
+{
+	u_char cmdblk[6],i,count = 0;
+
+	for (i = 0; i < XD_MAXDRIVES; i++) {
+		xd_build(cmdblk,CMD_TESTREADY,i,0,0,0,0,0);
+		if (!xd_command(cmdblk,PIO_MODE,NULL,NULL,NULL,XD_TIMEOUT*8)) {
+			set_current_state(TASK_INTERRUPTIBLE);
+			schedule_timeout(XD_INIT_DISK_DELAY);
+
+			init_drive(count);
+			count++;
+
+			set_current_state(TASK_INTERRUPTIBLE);
+			schedule_timeout(XD_INIT_DISK_DELAY);
+		}
+	}
+	return (count);
+}
+
+static void __init xd_manual_geo_set (u_char drive)
+{
+	xd_info[drive].heads = (u_char)(xd_geo[3 * drive + 1]);
+	xd_info[drive].cylinders = (u_short)(xd_geo[3 * drive]);
+	xd_info[drive].sectors = (u_char)(xd_geo[3 * drive + 2]);
+}
+
+static void __init xd_dtc_init_controller (unsigned int address)
+{
+	switch (address) {
+		case 0x00000:
+		case 0xC8000:	break;			/*initial: 0x320 */
+		case 0xCA000:	xd_iobase = 0x324; 
+		case 0xD0000:				/*5150CX*/
+		case 0xD8000:	break;			/*5150CX & 5150XL*/
+		default:        printk("xd_dtc_init_controller: unsupported BIOS address %06x\n",address);
+				break;
+	}
+	xd_maxsectors = 0x01;		/* my card seems to have trouble doing multi-block transfers? */
+
+	outb(0,XD_RESET);		/* reset the controller */
+}
+
+
+static void __init xd_dtc5150cx_init_drive (u_char drive)
+{
+	/* values from controller's BIOS - BIOS chip may be removed */
+	static u_short geometry_table[][4] = {
+		{0x200,8,0x200,0x100},
+		{0x267,2,0x267,0x267},
+		{0x264,4,0x264,0x80},
+		{0x132,4,0x132,0x0},
+		{0x132,2,0x80, 0x132},
+		{0x177,8,0x177,0x0},
+		{0x132,8,0x84, 0x0},
+		{},  /* not used */
+		{0x132,6,0x80, 0x100},
+		{0x200,6,0x100,0x100},
+		{0x264,2,0x264,0x80},
+		{0x280,4,0x280,0x100},
+		{0x2B9,3,0x2B9,0x2B9},
+		{0x2B9,5,0x2B9,0x2B9},
+		{0x280,6,0x280,0x100},
+		{0x132,4,0x132,0x0}};
+	u_char n;
+
+	n = inb(XD_JUMPER);
+	n = (drive ? n : (n >> 2)) & 0x33;
+	n = (n | (n >> 2)) & 0x0F;
+	if (xd_geo[3*drive])
+		xd_manual_geo_set(drive);
+	else
+		if (n != 7) {	
+			xd_info[drive].heads = (u_char)(geometry_table[n][1]);			/* heads */
+			xd_info[drive].cylinders = geometry_table[n][0];	/* cylinders */
+			xd_info[drive].sectors = 17;				/* sectors */
+#if 0
+			xd_info[drive].rwrite = geometry_table[n][2];	/* reduced write */
+			xd_info[drive].precomp = geometry_table[n][3]		/* write precomp */
+			xd_info[drive].ecc = 0x0B;				/* ecc length */
+#endif /* 0 */
+		}
+		else {
+			printk("xd%c: undetermined drive geometry\n",'a'+drive);
+			return;
+		}
+	xd_info[drive].control = 5;				/* control byte */
+	xd_setparam(CMD_DTCSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,geometry_table[n][2],geometry_table[n][3],0x0B);
+	xd_recalibrate(drive);
+}
+
+static void __init xd_dtc_init_drive (u_char drive)
+{
+	u_char cmdblk[6],buf[64];
+
+	xd_build(cmdblk,CMD_DTCGETGEOM,drive,0,0,0,0,0);
+	if (!xd_command(cmdblk,PIO_MODE,buf,NULL,NULL,XD_TIMEOUT * 2)) {
+		xd_info[drive].heads = buf[0x0A];			/* heads */
+		xd_info[drive].cylinders = ((u_short *) (buf))[0x04];	/* cylinders */
+		xd_info[drive].sectors = 17;				/* sectors */
+		if (xd_geo[3*drive])
+			xd_manual_geo_set(drive);
+#if 0
+		xd_info[drive].rwrite = ((u_short *) (buf + 1))[0x05];	/* reduced write */
+		xd_info[drive].precomp = ((u_short *) (buf + 1))[0x06];	/* write precomp */
+		xd_info[drive].ecc = buf[0x0F];				/* ecc length */
+#endif /* 0 */
+		xd_info[drive].control = 0;				/* control byte */
+
+		xd_setparam(CMD_DTCSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,((u_short *) (buf + 1))[0x05],((u_short *) (buf + 1))[0x06],buf[0x0F]);
+		xd_build(cmdblk,CMD_DTCSETSTEP,drive,0,0,0,0,7);
+		if (xd_command(cmdblk,PIO_MODE,NULL,NULL,NULL,XD_TIMEOUT * 2))
+			printk("xd_dtc_init_drive: error setting step rate for xd%c\n", 'a'+drive);
+	}
+	else
+		printk("xd_dtc_init_drive: error reading geometry for xd%c\n", 'a'+drive);
+}
+
+static void __init xd_wd_init_controller (unsigned int address)
+{
+	switch (address) {
+		case 0x00000:
+		case 0xC8000:	break;			/*initial: 0x320 */
+		case 0xCA000:	xd_iobase = 0x324; break;
+		case 0xCC000:   xd_iobase = 0x328; break;
+		case 0xCE000:   xd_iobase = 0x32C; break;
+		case 0xD0000:	xd_iobase = 0x328; break; /* ? */
+		case 0xD8000:	xd_iobase = 0x32C; break; /* ? */
+		default:        printk("xd_wd_init_controller: unsupported BIOS address %06x\n",address);
+				break;
+	}
+	xd_maxsectors = 0x01;		/* this one doesn't wrap properly either... */
+
+	outb(0,XD_RESET);		/* reset the controller */
+
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	schedule_timeout(XD_INIT_DISK_DELAY);
+}
+
+static void __init xd_wd_init_drive (u_char drive)
+{
+	/* values from controller's BIOS - BIOS may be disabled */
+	static u_short geometry_table[][4] = {
+		{0x264,4,0x1C2,0x1C2},   /* common part */
+		{0x132,4,0x099,0x0},
+		{0x267,2,0x1C2,0x1C2},
+		{0x267,4,0x1C2,0x1C2},
+
+		{0x334,6,0x335,0x335},   /* 1004 series RLL */
+		{0x30E,4,0x30F,0x3DC},
+		{0x30E,2,0x30F,0x30F},
+		{0x267,4,0x268,0x268},
+
+		{0x3D5,5,0x3D6,0x3D6},   /* 1002 series RLL */
+		{0x3DB,7,0x3DC,0x3DC},
+		{0x264,4,0x265,0x265},
+		{0x267,4,0x268,0x268}};
+
+	u_char cmdblk[6],buf[0x200];
+	u_char n = 0,rll,jumper_state,use_jumper_geo;
+	u_char wd_1002 = (xd_sigs[xd_type].string[7] == '6');
+	
+	jumper_state = ~(inb(0x322));
+	if (jumper_state & 0x40)
+		xd_irq = 9;
+	rll = (jumper_state & 0x30) ? (0x04 << wd_1002) : 0;
+	xd_build(cmdblk,CMD_READ,drive,0,0,0,1,0);
+	if (!xd_command(cmdblk,PIO_MODE,buf,NULL,NULL,XD_TIMEOUT * 2)) {
+		xd_info[drive].heads = buf[0x1AF];				/* heads */
+		xd_info[drive].cylinders = ((u_short *) (buf + 1))[0xD6];	/* cylinders */
+		xd_info[drive].sectors = 17;					/* sectors */
+		if (xd_geo[3*drive])
+			xd_manual_geo_set(drive);
+#if 0
+		xd_info[drive].rwrite = ((u_short *) (buf))[0xD8];		/* reduced write */
+		xd_info[drive].wprecomp = ((u_short *) (buf))[0xDA];		/* write precomp */
+		xd_info[drive].ecc = buf[0x1B4];				/* ecc length */
+#endif /* 0 */
+		xd_info[drive].control = buf[0x1B5];				/* control byte */
+		use_jumper_geo = !(xd_info[drive].heads) || !(xd_info[drive].cylinders);
+		if (xd_geo[3*drive]) {
+			xd_manual_geo_set(drive);
+			xd_info[drive].control = rll ? 7 : 5;
+		}
+		else if (use_jumper_geo) {
+			n = (((jumper_state & 0x0F) >> (drive << 1)) & 0x03) | rll;
+			xd_info[drive].cylinders = geometry_table[n][0];
+			xd_info[drive].heads = (u_char)(geometry_table[n][1]);
+			xd_info[drive].control = rll ? 7 : 5;
+#if 0
+			xd_info[drive].rwrite = geometry_table[n][2];
+			xd_info[drive].wprecomp = geometry_table[n][3];
+			xd_info[drive].ecc = 0x0B;
+#endif /* 0 */
+		}
+		if (!wd_1002) {
+			if (use_jumper_geo)
+				xd_setparam(CMD_WDSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,
+					geometry_table[n][2],geometry_table[n][3],0x0B);
+			else
+				xd_setparam(CMD_WDSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,
+					((u_short *) (buf))[0xD8],((u_short *) (buf))[0xDA],buf[0x1B4]);
+		}
+	/* 1002 based RLL controller requests converted addressing, but reports physical 
+	   (physical 26 sec., logical 17 sec.) 
+	   1004 based ???? */
+		if (rll & wd_1002) {
+			if ((xd_info[drive].cylinders *= 26,
+			     xd_info[drive].cylinders /= 17) > 1023)
+				xd_info[drive].cylinders = 1023;  /* 1024 ? */
+#if 0
+			xd_info[drive].rwrite *= 26; 
+			xd_info[drive].rwrite /= 17;
+			xd_info[drive].wprecomp *= 26
+			xd_info[drive].wprecomp /= 17;
+#endif /* 0 */
+		}
+	}
+	else
+		printk("xd_wd_init_drive: error reading geometry for xd%c\n",'a'+drive);	
+
+}
+
+static void __init xd_seagate_init_controller (unsigned int address)
+{
+	switch (address) {
+		case 0x00000:
+		case 0xC8000:	break;			/*initial: 0x320 */
+		case 0xD0000:	xd_iobase = 0x324; break;
+		case 0xD8000:	xd_iobase = 0x328; break;
+		case 0xE0000:	xd_iobase = 0x32C; break;
+		default:	printk("xd_seagate_init_controller: unsupported BIOS address %06x\n",address);
+				break;
+	}
+	xd_maxsectors = 0x40;
+
+	outb(0,XD_RESET);		/* reset the controller */
+}
+
+static void __init xd_seagate_init_drive (u_char drive)
+{
+	u_char cmdblk[6],buf[0x200];
+
+	xd_build(cmdblk,CMD_ST11GETGEOM,drive,0,0,0,1,0);
+	if (!xd_command(cmdblk,PIO_MODE,buf,NULL,NULL,XD_TIMEOUT * 2)) {
+		xd_info[drive].heads = buf[0x04];				/* heads */
+		xd_info[drive].cylinders = (buf[0x02] << 8) | buf[0x03];	/* cylinders */
+		xd_info[drive].sectors = buf[0x05];				/* sectors */
+		xd_info[drive].control = 0;					/* control byte */
+	}
+	else
+		printk("xd_seagate_init_drive: error reading geometry from xd%c\n", 'a'+drive);
+}
+
+/* Omti support courtesy Dirk Melchers */
+static void __init xd_omti_init_controller (unsigned int address)
+{
+	switch (address) {
+		case 0x00000:
+		case 0xC8000:	break;			/*initial: 0x320 */
+		case 0xD0000:	xd_iobase = 0x324; break;
+		case 0xD8000:	xd_iobase = 0x328; break;
+		case 0xE0000:	xd_iobase = 0x32C; break;
+		default:	printk("xd_omti_init_controller: unsupported BIOS address %06x\n",address);
+				break;
+	}
+	
+	xd_maxsectors = 0x40;
+
+	outb(0,XD_RESET);		/* reset the controller */
+}
+
+static void __init xd_omti_init_drive (u_char drive)
+{
+	/* gets infos from drive */
+	xd_override_init_drive(drive);
+
+	/* set other parameters, Hardcoded, not that nice :-) */
+	xd_info[drive].control = 2;
+}
+
+/* Xebec support (AK) */
+static void __init xd_xebec_init_controller (unsigned int address)
+{
+/* iobase may be set manually in range 0x300 - 0x33C
+      irq may be set manually to 2(9),3,4,5,6,7
+      dma may be set manually to 1,2,3
+	(How to detect them ???)
+BIOS address may be set manually in range 0x0 - 0xF8000
+If you need non-standard settings use the xd=... command */
+
+	switch (address) {
+		case 0x00000:
+		case 0xC8000:	/* initially: xd_iobase==0x320 */
+		case 0xD0000:
+		case 0xD2000:
+		case 0xD4000:
+		case 0xD6000:
+		case 0xD8000:
+		case 0xDA000:
+		case 0xDC000:
+		case 0xDE000:
+		case 0xE0000:	break;
+		default:	printk("xd_xebec_init_controller: unsupported BIOS address %06x\n",address);
+				break;
+		}
+
+	xd_maxsectors = 0x01;
+	outb(0,XD_RESET);		/* reset the controller */
+
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	schedule_timeout(XD_INIT_DISK_DELAY);
+}
+
+static void __init xd_xebec_init_drive (u_char drive)
+{
+	/* values from controller's BIOS - BIOS chip may be removed */
+	static u_short geometry_table[][5] = {
+		{0x132,4,0x080,0x080,0x7},
+		{0x132,4,0x080,0x080,0x17},
+		{0x264,2,0x100,0x100,0x7},
+		{0x264,2,0x100,0x100,0x17},
+		{0x132,8,0x080,0x080,0x7},
+		{0x132,8,0x080,0x080,0x17},
+		{0x264,4,0x100,0x100,0x6},
+		{0x264,4,0x100,0x100,0x17},
+		{0x2BC,5,0x2BC,0x12C,0x6},
+		{0x3A5,4,0x3A5,0x3A5,0x7},
+		{0x26C,6,0x26C,0x26C,0x7},
+		{0x200,8,0x200,0x100,0x17},
+		{0x400,5,0x400,0x400,0x7},
+		{0x400,6,0x400,0x400,0x7},
+		{0x264,8,0x264,0x200,0x17},
+		{0x33E,7,0x33E,0x200,0x7}};
+	u_char n;
+
+	n = inb(XD_JUMPER) & 0x0F; /* BIOS's drive number: same geometry 
+					is assumed for BOTH drives */
+	if (xd_geo[3*drive])
+		xd_manual_geo_set(drive);
+	else {
+		xd_info[drive].heads = (u_char)(geometry_table[n][1]);			/* heads */
+		xd_info[drive].cylinders = geometry_table[n][0];	/* cylinders */
+		xd_info[drive].sectors = 17;				/* sectors */
+#if 0
+		xd_info[drive].rwrite = geometry_table[n][2];	/* reduced write */
+		xd_info[drive].precomp = geometry_table[n][3]		/* write precomp */
+		xd_info[drive].ecc = 0x0B;				/* ecc length */
+#endif /* 0 */
+	}
+	xd_info[drive].control = geometry_table[n][4];			/* control byte */
+	xd_setparam(CMD_XBSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,geometry_table[n][2],geometry_table[n][3],0x0B);
+	xd_recalibrate(drive);
+}
+
+/* xd_override_init_drive: this finds disk geometry in a "binary search" style, narrowing in on the "correct" number of heads
+   etc. by trying values until it gets the highest successful value. Idea courtesy Salvador Abreu (spa@fct.unl.pt). */
+static void __init xd_override_init_drive (u_char drive)
+{
+	u_short min[] = { 0,0,0 },max[] = { 16,1024,64 },test[] = { 0,0,0 };
+	u_char cmdblk[6],i;
+
+	if (xd_geo[3*drive])
+		xd_manual_geo_set(drive);
+	else {
+		for (i = 0; i < 3; i++) {
+			while (min[i] != max[i] - 1) {
+				test[i] = (min[i] + max[i]) / 2;
+				xd_build(cmdblk,CMD_SEEK,drive,(u_char) test[0],(u_short) test[1],(u_char) test[2],0,0);
+				if (!xd_command(cmdblk,PIO_MODE,NULL,NULL,NULL,XD_TIMEOUT * 2))
+					min[i] = test[i];
+				else
+					max[i] = test[i];
+			}
+			test[i] = min[i];
+		}
+		xd_info[drive].heads = (u_char) min[0] + 1;
+		xd_info[drive].cylinders = (u_short) min[1] + 1;
+		xd_info[drive].sectors = (u_char) min[2] + 1;
+	}
+	xd_info[drive].control = 0;
+}
+
+/* xd_setup: initialise controller from command line parameters */
+static void __init do_xd_setup (int *integers)
+{
+	switch (integers[0]) {
+		case 4: if (integers[4] < 0)
+				nodma = 1;
+			else if (integers[4] < 8)
+				xd_dma = integers[4];
+		case 3: if ((integers[3] > 0) && (integers[3] <= 0x3FC))
+				xd_iobase = integers[3];
+		case 2: if ((integers[2] > 0) && (integers[2] < 16))
+				xd_irq = integers[2];
+		case 1: xd_override = 1;
+			if ((integers[1] >= 0) && (integers[1] < (sizeof(xd_sigs) / sizeof(xd_sigs[0]))))
+				xd_type = integers[1];
+		case 0: break;
+		default:printk("xd: too many parameters for xd\n");
+	}
+	xd_maxsectors = 0x01;
+}
+
+/* xd_setparam: set the drive characteristics */
+static void __init xd_setparam (u_char command,u_char drive,u_char heads,u_short cylinders,u_short rwrite,u_short wprecomp,u_char ecc)
+{
+	u_char cmdblk[14];
+
+	xd_build(cmdblk,command,drive,0,0,0,0,0);
+	cmdblk[6] = (u_char) (cylinders >> 8) & 0x03;
+	cmdblk[7] = (u_char) (cylinders & 0xFF);
+	cmdblk[8] = heads & 0x1F;
+	cmdblk[9] = (u_char) (rwrite >> 8) & 0x03;
+	cmdblk[10] = (u_char) (rwrite & 0xFF);
+	cmdblk[11] = (u_char) (wprecomp >> 8) & 0x03;
+	cmdblk[12] = (u_char) (wprecomp & 0xFF);
+	cmdblk[13] = ecc;
+
+	/* Some controllers require geometry info as data, not command */
+
+	if (xd_command(cmdblk,PIO_MODE,NULL,&cmdblk[6],NULL,XD_TIMEOUT * 2))
+		printk("xd: error setting characteristics for xd%c\n", 'a'+drive);
+}
+
+
+#ifdef MODULE
+
+module_param_array(xd, int, NULL, 0);
+module_param_array(xd_geo, int, NULL, 0);
+module_param(nodma, bool, 0);
+
+MODULE_LICENSE("GPL");
+
+void cleanup_module(void)
+{
+	int i;
+	unregister_blkdev(XT_DISK_MAJOR, "xd");
+	for (i = 0; i < xd_drives; i++) {
+		del_gendisk(xd_gendisk[i]);
+		put_disk(xd_gendisk[i]);
+	}
+	blk_cleanup_queue(xd_queue);
+	release_region(xd_iobase,4);
+	if (xd_drives) {
+		free_irq(xd_irq, NULL);
+		free_dma(xd_dma);
+		if (xd_dma_buffer)
+			xd_dma_mem_free((unsigned long)xd_dma_buffer, xd_maxsectors * 0x200);
+	}
+}
+#else
+
+static int __init xd_setup (char *str)
+{
+	int ints[5];
+	get_options (str, ARRAY_SIZE (ints), ints);
+	do_xd_setup (ints);
+	return 1;
+}
+
+/* xd_manual_geo_init: initialise drive geometry from command line parameters
+   (used only for WD drives) */
+static int __init xd_manual_geo_init (char *str)
+{
+	int i, integers[1 + 3*XD_MAXDRIVES];
+
+	get_options (str, ARRAY_SIZE (integers), integers);
+	if (integers[0]%3 != 0) {
+		printk("xd: incorrect number of parameters for xd_geo\n");
+		return 1;
+	}
+	for (i = 0; (i < integers[0]) && (i < 3*XD_MAXDRIVES); i++)
+		xd_geo[i] = integers[i+1];
+	return 1;
+}
+
+__setup ("xd=", xd_setup);
+__setup ("xd_geo=", xd_manual_geo_init);
+
+#endif /* MODULE */
+
+module_init(xd_init);
+MODULE_ALIAS_BLOCKDEV_MAJOR(XT_DISK_MAJOR);