/*
 *  linux/drivers/ide/ide.c		Version 7.00alpha1	August 19 2002
 *
 *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
 */

/*
 *  Mostly written by Mark Lord  <mlord@pobox.com>
 *                and Gadi Oxman <gadio@netvision.net.il>
 *                and Andre Hedrick <andre@linux-ide.org>
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 * This is the multiple IDE interface driver, as evolved from hd.c.
 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
 *   (usually 14 & 15).
 * There can be up to two drives per interface, as per the ATA-2 spec.
 *
 * Primary:    ide0, port 0x1f0; major=3;  hda is minor=0; hdb is minor=64
 * Secondary:  ide1, port 0x170; major=22; hdc is minor=0; hdd is minor=64
 * Tertiary:   ide2, port 0x???; major=33; hde is minor=0; hdf is minor=64
 * Quaternary: ide3, port 0x???; major=34; hdg is minor=0; hdh is minor=64
 * ...
 *
 *  From hd.c:
 *  |
 *  | It traverses the request-list, using interrupts to jump between functions.
 *  | As nearly all functions can be called within interrupts, we may not sleep.
 *  | Special care is recommended.  Have Fun!
 *  |
 *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
 *  |
 *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
 *  | in the early extended-partition checks and added DM partitions.
 *  |
 *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
 *  |
 *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
 *  | and general streamlining by Mark Lord (mlord@pobox.com).
 *
 *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
 *
 *	Mark Lord	(mlord@pobox.com)		(IDE Perf.Pkg)
 *	Delman Lee	(delman@ieee.org)		("Mr. atdisk2")
 *	Scott Snyder	(snyder@fnald0.fnal.gov)	(ATAPI IDE cd-rom)
 *
 *  This was a rewrite of just about everything from hd.c, though some original
 *  code is still sprinkled about.  Think of it as a major evolution, with
 *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
 *
 *  Version 1.0 ALPHA	initial code, primary i/f working okay
 *  Version 1.3 BETA	dual i/f on shared irq tested & working!
 *  Version 1.4 BETA	added auto probing for irq(s)
 *  Version 1.5 BETA	added ALPHA (untested) support for IDE cd-roms,
 *  ...
 * Version 5.50		allow values as small as 20 for idebus=
 * Version 5.51		force non io_32bit in drive_cmd_intr()
 *			change delay_10ms() to delay_50ms() to fix problems
 * Version 5.52		fix incorrect invalidation of removable devices
 *			add "hdx=slow" command line option
 * Version 5.60		start to modularize the driver; the disk and ATAPI
 *			 drivers can be compiled as loadable modules.
 *			move IDE probe code to ide-probe.c
 *			move IDE disk code to ide-disk.c
 *			add support for generic IDE device subdrivers
 *			add m68k code from Geert Uytterhoeven
 *			probe all interfaces by default
 *			add ioctl to (re)probe an interface
 * Version 6.00		use per device request queues
 *			attempt to optimize shared hwgroup performance
 *			add ioctl to manually adjust bandwidth algorithms
 *			add kerneld support for the probe module
 *			fix bug in ide_error()
 *			fix bug in the first ide_get_lock() call for Atari
 *			don't flush leftover data for ATAPI devices
 * Version 6.01		clear hwgroup->active while the hwgroup sleeps
 *			support HDIO_GETGEO for floppies
 * Version 6.02		fix ide_ack_intr() call
 *			check partition table on floppies
 * Version 6.03		handle bad status bit sequencing in ide_wait_stat()
 * Version 6.10		deleted old entries from this list of updates
 *			replaced triton.c with ide-dma.c generic PCI DMA
 *			added support for BIOS-enabled UltraDMA
 *			rename all "promise" things to "pdc4030"
 *			fix EZ-DRIVE handling on small disks
 * Version 6.11		fix probe error in ide_scan_devices()
 *			fix ancient "jiffies" polling bugs
 *			mask all hwgroup interrupts on each irq entry
 * Version 6.12		integrate ioctl and proc interfaces
 *			fix parsing of "idex=" command line parameter
 * Version 6.13		add support for ide4/ide5 courtesy rjones@orchestream.com
 * Version 6.14		fixed IRQ sharing among PCI devices
 * Version 6.15		added SMP awareness to IDE drivers
 * Version 6.16		fixed various bugs; even more SMP friendly
 * Version 6.17		fix for newest EZ-Drive problem
 * Version 6.18		default unpartitioned-disk translation now "BIOS LBA"
 * Version 6.19		Re-design for a UNIFORM driver for all platforms,
 *			  model based on suggestions from Russell King and
 *			  Geert Uytterhoeven
 *			Promise DC4030VL now supported.
 *			add support for ide6/ide7
 *			delay_50ms() changed to ide_delay_50ms() and exported.
 * Version 6.20		Added/Fixed Generic ATA-66 support and hwif detection.
 *			Added hdx=flash to allow for second flash disk
 *			  detection w/o the hang loop.
 *			Added support for ide8/ide9
 *			Added idex=ata66 for the quirky chipsets that are
 *			  ATA-66 compliant, but have yet to determine a method
 *			  of verification of the 80c cable presence.
 *			  Specifically Promise's PDC20262 chipset.
 * Version 6.21		Fixing/Fixed SMP spinlock issue with insight from an old
 *			  hat that clarified original low level driver design.
 * Version 6.30		Added SMP support; fixed multmode issues.  -ml
 * Version 6.31		Debug Share INTR's and request queue streaming
 *			Native ATA-100 support
 *			Prep for Cascades Project
 * Version 7.00alpha	First named revision of ide rearrange
 *
 *  Some additional driver compile-time options are in ./include/linux/ide.h
 *
 *  To do, in likely order of completion:
 *	- modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
 *
 */

#define	REVISION	"Revision: 7.00alpha2"
#define	VERSION		"Id: ide.c 7.00a2 20020906"

#undef REALLY_SLOW_IO		/* most systems can safely undef this */

#define _IDE_C			/* Tell ide.h it's really us */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/completion.h>
#include <linux/reboot.h>
#include <linux/cdrom.h>
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/kmod.h>

#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/bitops.h>

#include "ide_modes.h"


/* default maximum number of failures */
#define IDE_DEFAULT_MAX_FAILURES 	1

static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
					IDE2_MAJOR, IDE3_MAJOR,
					IDE4_MAJOR, IDE5_MAJOR,
					IDE6_MAJOR, IDE7_MAJOR,
					IDE8_MAJOR, IDE9_MAJOR };

static int idebus_parameter;	/* holds the "idebus=" parameter */
static int system_bus_speed;	/* holds what we think is VESA/PCI bus speed */
static int initializing;	/* set while initializing built-in drivers */

spinlock_t ide_lock __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED;

static int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */

#ifdef IDE_ARCH_LOCK
/*
 * ide_lock is used by the Atari code to obtain access to the IDE interrupt,
 * which is shared between several drivers.
 */
static int	ide_intr_lock;
#endif /* IDE_ARCH_LOCK */

#ifdef CONFIG_IDEDMA_AUTO
int noautodma = 0;
#else
int noautodma = 1;
#endif

EXPORT_SYMBOL(noautodma);

/*
 * ide_modules keeps track of the available IDE chipset/probe/driver modules.
 */
ide_module_t *ide_chipsets;
ide_module_t *ide_probe;

/*
 * This is declared extern in ide.h, for access by other IDE modules:
 */
ide_hwif_t ide_hwifs[MAX_HWIFS];	/* master data repository */

EXPORT_SYMBOL(ide_hwifs);

ide_devices_t *idedisk;
ide_devices_t *idecd;
ide_devices_t *idefloppy;
ide_devices_t *idetape;
ide_devices_t *idescsi;

EXPORT_SYMBOL(idedisk);
EXPORT_SYMBOL(idecd);
EXPORT_SYMBOL(idefloppy);
EXPORT_SYMBOL(idetape);
EXPORT_SYMBOL(idescsi);


/*
 * Do not even *think* about calling this!
 */
static void init_hwif_data (unsigned int index)
{
	unsigned int unit;
	hw_regs_t hw;
	ide_hwif_t *hwif = &ide_hwifs[index];

	/* bulk initialize hwif & drive info with zeros */
	memset(hwif, 0, sizeof(ide_hwif_t));
	memset(&hw, 0, sizeof(hw_regs_t));

	/* fill in any non-zero initial values */
	hwif->index     = index;
	ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
	memcpy(&hwif->hw, &hw, sizeof(hw));
	memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
	hwif->noprobe	= !hwif->io_ports[IDE_DATA_OFFSET];
#ifdef CONFIG_BLK_DEV_HD
	if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
		hwif->noprobe = 1; /* may be overridden by ide_setup() */
#endif /* CONFIG_BLK_DEV_HD */
	hwif->major	= ide_hwif_to_major[index];
	hwif->name[0]	= 'i';
	hwif->name[1]	= 'd';
	hwif->name[2]	= 'e';
	hwif->name[3]	= '0' + index;
	hwif->bus_state = BUSSTATE_ON;
	hwif->reset_poll= NULL;
	hwif->pre_reset = NULL;

	hwif->atapi_dma = 0;		/* disable all atapi dma */ 
	hwif->ultra_mask = 0x80;	/* disable all ultra */
	hwif->mwdma_mask = 0x80;	/* disable all mwdma */
	hwif->swdma_mask = 0x80;	/* disable all swdma */

	default_hwif_iops(hwif);
	default_hwif_transport(hwif);
	for (unit = 0; unit < MAX_DRIVES; ++unit) {
		ide_drive_t *drive = &hwif->drives[unit];

		drive->media			= ide_disk;
		drive->select.all		= (unit<<4)|0xa0;
		drive->hwif			= hwif;
		drive->ctl			= 0x08;
		drive->ready_stat		= READY_STAT;
		drive->bad_wstat		= BAD_W_STAT;
		drive->special.b.recalibrate	= 1;
		drive->special.b.set_geometry	= 1;
		drive->name[0]			= 'h';
		drive->name[1]			= 'd';
		drive->name[2]			= 'a' + (index * MAX_DRIVES) + unit;
		drive->max_failures		= IDE_DEFAULT_MAX_FAILURES;
		drive->using_dma		= 0;
		drive->is_flash			= 0;
		drive->vdma			= 0;
		INIT_LIST_HEAD(&drive->list);
	}
}

/*
 * init_ide_data() sets reasonable default values into all fields
 * of all instances of the hwifs and drives, but only on the first call.
 * Subsequent calls have no effect (they don't wipe out anything).
 *
 * This routine is normally called at driver initialization time,
 * but may also be called MUCH earlier during kernel "command-line"
 * parameter processing.  As such, we cannot depend on any other parts
 * of the kernel (such as memory allocation) to be functioning yet.
 *
 * This is too bad, as otherwise we could dynamically allocate the
 * ide_drive_t structs as needed, rather than always consuming memory
 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 *
 * FIXME: We should stuff the setup data into __init and copy the
 * relevant hwifs/allocate them properly during boot.
 */
#define MAGIC_COOKIE 0x12345678
static void __init init_ide_data (void)
{
	unsigned int index;
	static unsigned long magic_cookie = MAGIC_COOKIE;

	if (magic_cookie != MAGIC_COOKIE)
		return;		/* already initialized */
	magic_cookie = 0;

	/* Initialise all interface structures */
	for (index = 0; index < MAX_HWIFS; ++index)
		init_hwif_data(index);

	/* Add default hw interfaces */
	ide_init_default_hwifs();

	idebus_parameter = 0;
	system_bus_speed = 0;
}

/*
 * ide_system_bus_speed() returns what we think is the system VESA/PCI
 * bus speed (in MHz).  This is used for calculating interface PIO timings.
 * The default is 40 for known PCI systems, 50 otherwise.
 * The "idebus=xx" parameter can be used to override this value.
 * The actual value to be used is computed/displayed the first time through.
 */
int ide_system_bus_speed (void)
{
	if (!system_bus_speed) {
		if (idebus_parameter) {
			/* user supplied value */
			system_bus_speed = idebus_parameter;
		} else if (pci_present()) {
			/* safe default value for PCI */
			system_bus_speed = 33;
		} else {
			/* safe default value for VESA and PCI */
			system_bus_speed = 50;
		}
		printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
			"for PIO modes%s\n", system_bus_speed,
			idebus_parameter ? "" : "; override with idebus=xx");
	}
	return system_bus_speed;
}

/*
 * current_capacity() returns the capacity (in sectors) of a drive
 * according to its current geometry/LBA settings.
 */
unsigned long current_capacity (ide_drive_t *drive)
{
	if (!drive->present)
		return 0;
	if (drive->driver != NULL)
		return DRIVER(drive)->capacity(drive);
	return 0;
}

EXPORT_SYMBOL(current_capacity);

static inline u32 read_24 (ide_drive_t *drive)
{
	return  (HWIF(drive)->INB(IDE_HCYL_REG)<<16) |
		(HWIF(drive)->INB(IDE_LCYL_REG)<<8) |
		 HWIF(drive)->INB(IDE_SECTOR_REG);
}

/*
 * Error reporting, in human readable form (luxurious, but a memory hog).
 */
u8 ide_dump_status (ide_drive_t *drive, const char *msg, u8 stat)
{
	ide_hwif_t *hwif = HWIF(drive);
	unsigned long flags;
	u8 err = 0;

	local_irq_set(flags);
	printk(KERN_WARNING "%s: %s: status=0x%02x", drive->name, msg, stat);
#if FANCY_STATUS_DUMPS
	printk(" { ");
	if (stat & BUSY_STAT) {
		printk("Busy ");
	} else {
		if (stat & READY_STAT)	printk("DriveReady ");
		if (stat & WRERR_STAT)	printk("DeviceFault ");
		if (stat & SEEK_STAT)	printk("SeekComplete ");
		if (stat & DRQ_STAT)	printk("DataRequest ");
		if (stat & ECC_STAT)	printk("CorrectedError ");
		if (stat & INDEX_STAT)	printk("Index ");
		if (stat & ERR_STAT)	printk("Error ");
	}
	printk("}");
#endif	/* FANCY_STATUS_DUMPS */
	printk("\n");
	if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
		err = hwif->INB(IDE_ERROR_REG);
		printk("%s: %s: error=0x%02x", drive->name, msg, err);
#if FANCY_STATUS_DUMPS
		if (drive->media == ide_disk) {
			printk(" { ");
			if (err & ABRT_ERR)	printk("DriveStatusError ");
			if (err & ICRC_ERR)	printk("Bad%s ", (err & ABRT_ERR) ? "CRC" : "Sector");
			if (err & ECC_ERR)	printk("UncorrectableError ");
			if (err & ID_ERR)	printk("SectorIdNotFound ");
			if (err & TRK0_ERR)	printk("TrackZeroNotFound ");
			if (err & MARK_ERR)	printk("AddrMarkNotFound ");
			printk("}");
			if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR || (err & (ECC_ERR|ID_ERR|MARK_ERR))) {
				if ((drive->id->command_set_2 & 0x0400) &&
				    (drive->id->cfs_enable_2 & 0x0400) &&
				    (drive->addressing == 1)) {
					u64 sectors = 0;
					u32 high = 0;
					u32 low = read_24(drive);
					hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
					high = read_24(drive);

					sectors = ((u64)high << 24) | low;
					printk(", LBAsect=%llu, high=%d, low=%d",
					       (long long) sectors,
					       high, low);
				} else {
					u8 cur = hwif->INB(IDE_SELECT_REG);
					if (cur & 0x40) {	/* using LBA? */
						printk(", LBAsect=%ld", (unsigned long)
						 ((cur&0xf)<<24)
						 |(hwif->INB(IDE_HCYL_REG)<<16)
						 |(hwif->INB(IDE_LCYL_REG)<<8)
						 | hwif->INB(IDE_SECTOR_REG));
					} else {
						printk(", CHS=%d/%d/%d",
						 (hwif->INB(IDE_HCYL_REG)<<8) +
						  hwif->INB(IDE_LCYL_REG),
						  cur & 0xf,
						  hwif->INB(IDE_SECTOR_REG));
					}
				}
				if (HWGROUP(drive) && HWGROUP(drive)->rq)
					printk(", sector=%llu", (unsigned long long)HWGROUP(drive)->rq->sector);
			}
		}
#endif	/* FANCY_STATUS_DUMPS */
		printk("\n");
	}
	local_irq_restore(flags);
	return err;
}

EXPORT_SYMBOL(ide_dump_status);



void ide_probe_module (void)
{
	if (!ide_probe) {
#if defined(CONFIG_KMOD) && defined(CONFIG_BLK_DEV_IDE_MODULE)
		(void) request_module("ide-probe-mod");
#endif /* (CONFIG_KMOD) && (CONFIG_BLK_DEV_IDE_MODULE) */
	} else {
		(void) ide_probe->init();
	}
}

EXPORT_SYMBOL(ide_probe_module);

static int ide_open (struct inode * inode, struct file * filp)
{
	return -ENXIO;
}

static LIST_HEAD(ata_unused);
static spinlock_t drives_lock = SPIN_LOCK_UNLOCKED;
static spinlock_t drivers_lock = SPIN_LOCK_UNLOCKED;
static LIST_HEAD(drivers);

/* Iterator */
static void *m_start(struct seq_file *m, loff_t *pos)
{
	struct list_head *p;
	loff_t l = *pos;
	spin_lock(&drivers_lock);
	list_for_each(p, &drivers)
		if (!l--)
			return list_entry(p, ide_driver_t, drivers);
	return NULL;
}
static void *m_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct list_head *p = ((ide_driver_t *)v)->drivers.next;
	(*pos)++;
	return p==&drivers ? NULL : list_entry(p, ide_driver_t, drivers);
}
static void m_stop(struct seq_file *m, void *v)
{
	spin_unlock(&drivers_lock);
}
static int show_driver(struct seq_file *m, void *v)
{
	ide_driver_t *driver = v;
	seq_printf(m, "%s version %s\n", driver->name, driver->version);
	return 0;
}
struct seq_operations ide_drivers_op = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_driver
};

#ifdef CONFIG_PROC_FS
ide_proc_entry_t generic_subdriver_entries[] = {
	{ "capacity",	S_IFREG|S_IRUGO,	proc_ide_read_capacity,	NULL },
	{ NULL, 0, NULL, NULL }
};
#endif


#define hwif_release_region(addr, num) \
	((hwif->mmio) ? release_mem_region((addr),(num)) : release_region((addr),(num)))

/**
 *	hwif_unregister		-	free IDE resources
 *
 *	Note that we only release the standard ports,
 *	and do not even try to handle any extra ports
 *	allocated for weird IDE interface chipsets.
 *
 *	Note also that we don't yet handle mmio resources here. More
 *	importantly our caller should be doing this so we need to 
 *	restructure this as a helper function for drivers.
 */
 
void hwif_unregister (ide_hwif_t *hwif)
{
	u32 i = 0;

	if (hwif->mmio == 2)
		return;
	if (hwif->io_ports[IDE_CONTROL_OFFSET])
		hwif_release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
#if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
	if (hwif->io_ports[IDE_IRQ_OFFSET])
		hwif_release_region(hwif->io_ports[IDE_IRQ_OFFSET], 1);
#endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */

	if (hwif->straight8) {
		hwif_release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
		return;
	}
	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
		if (hwif->io_ports[i]) {
			hwif_release_region(hwif->io_ports[i], 1);
		}
	}
}

EXPORT_SYMBOL(hwif_unregister);

extern void init_hwif_data(unsigned int index);

/**
 *	ide_unregister		-	free an ide interface
 *	@index: index of interface (will change soon to a pointer)
 *
 *	Perform the final unregister of an IDE interface. At the moment
 *	we don't refcount interfaces so this will also get split up.
 *
 *	Locking:
 *	The caller must not hold the IDE locks
 *	The drive present/vanishing is not yet properly locked
 *	Take care with the callbacks. These have been split to avoid
 *	deadlocking the IDE layer. The shutdown callback is called
 *	before we take the lock and free resources. It is up to the
 *	caller to be sure there is no pending I/O here, and that
 *	the interfce will not be reopened (present/vanishing locking
 *	isnt yet done btw). After we commit to the final kill we
 *	call the cleanup callback with the ide locks held.
 *
 *	Unregister restores the hwif structures to the default state.
 *	This is raving bonkers.
 */
 
void ide_unregister (unsigned int index)
{
	ide_drive_t *drive, *d;
	ide_hwif_t *hwif, *g;
	ide_hwgroup_t *hwgroup;
	int irq_count = 0, unit, i;
	unsigned long flags;
	ide_hwif_t old_hwif;

	if (index >= MAX_HWIFS)
		BUG();
		
	spin_lock_irqsave(&ide_lock, flags);
	hwif = &ide_hwifs[index];
	if (!hwif->present)
		goto abort;
	for (unit = 0; unit < MAX_DRIVES; ++unit) {
		drive = &hwif->drives[unit];
		if (!drive->present)
			continue;
		if (drive->usage)
			goto abort;
		if (drive->driver != NULL && DRIVER(drive)->shutdown(drive))
			goto abort;
	}
	hwif->present = 0;
	
	spin_unlock_irqrestore(&ide_lock, flags);

	for (unit = 0; unit < MAX_DRIVES; ++unit) {
		drive = &hwif->drives[unit];
		if (!drive->present)
			continue;
		if (drive->driver != NULL)
			DRIVER(drive)->cleanup(drive);
	}
	
#ifdef CONFIG_PROC_FS
	destroy_proc_ide_drives(hwif);
#endif
	spin_lock_irqsave(&ide_lock, flags);
	hwgroup = hwif->hwgroup;

	/*
	 * free the irq if we were the only hwif using it
	 */
	g = hwgroup->hwif;
	do {
		if (g->irq == hwif->irq)
			++irq_count;
		g = g->next;
	} while (g != hwgroup->hwif);
	if (irq_count == 1)
		free_irq(hwif->irq, hwgroup);

	/*
	 * Note that we only release the standard ports,
	 * and do not even try to handle any extra ports
	 * allocated for weird IDE interface chipsets.
	 */
	hwif_unregister(hwif);

	/*
	 * Remove us from the hwgroup, and free
	 * the hwgroup if we were the only member
	 */
	d = hwgroup->drive;
	for (i = 0; i < MAX_DRIVES; ++i) {
		drive = &hwif->drives[i];
		if (drive->de) {
			devfs_unregister(drive->de);
			drive->de = NULL;
		}
		if (!drive->present)
			continue;
		while (hwgroup->drive->next != drive)
			hwgroup->drive = hwgroup->drive->next;
		hwgroup->drive->next = drive->next;
		if (hwgroup->drive == drive)
			hwgroup->drive = NULL;
		if (drive->id != NULL) {
			kfree(drive->id);
			drive->id = NULL;
		}
		drive->present = 0;
		blk_cleanup_queue(&drive->queue);
	}
	if (d->present)
		hwgroup->drive = d;
	while (hwgroup->hwif->next != hwif)
		hwgroup->hwif = hwgroup->hwif->next;
	hwgroup->hwif->next = hwif->next;
	if (hwgroup->hwif == hwif)
		kfree(hwgroup);
	else
		hwgroup->hwif = HWIF(hwgroup->drive);

#if !defined(CONFIG_DMA_NONPCI)
	if (hwif->dma_base) {
		(void) ide_release_dma(hwif);

		hwif->dma_base = 0;
		hwif->dma_master = 0;
		hwif->dma_command = 0;
		hwif->dma_vendor1 = 0;
		hwif->dma_status = 0;
		hwif->dma_vendor3 = 0;
		hwif->dma_prdtable = 0;
	}
#endif /* !(CONFIG_DMA_NONPCI) */

	/*
	 * Remove us from the kernel's knowledge
	 */
	blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
	for (i = 0; i < MAX_DRIVES; i++) {
		struct gendisk *disk = hwif->drives[i].disk;
		hwif->drives[i].disk = NULL;
		put_disk(disk);
	}
	unregister_blkdev(hwif->major, hwif->name);
	old_hwif			= *hwif;
	init_hwif_data(index);	/* restore hwif data to pristine status */
	hwif->hwgroup			= old_hwif.hwgroup;

	hwif->proc			= old_hwif.proc;

	hwif->major			= old_hwif.major;
//	hwif->index			= old_hwif.index;
//	hwif->channel			= old_hwif.channel;
	hwif->straight8			= old_hwif.straight8;
	hwif->bus_state			= old_hwif.bus_state;

	hwif->atapi_dma			= old_hwif.atapi_dma;
	hwif->ultra_mask		= old_hwif.ultra_mask;
	hwif->mwdma_mask		= old_hwif.mwdma_mask;
	hwif->swdma_mask		= old_hwif.swdma_mask;

	hwif->chipset			= old_hwif.chipset;

#ifdef CONFIG_BLK_DEV_IDEPCI
	hwif->pci_dev			= old_hwif.pci_dev;
	hwif->cds			= old_hwif.cds;
#endif /* CONFIG_BLK_DEV_IDEPCI */

#if 0
	hwif->hwifops			= old_hwif.hwifops;
#else
	hwif->identify			= old_hwif.identify;
	hwif->tuneproc			= old_hwif.tuneproc;
	hwif->speedproc			= old_hwif.speedproc;
	hwif->selectproc		= old_hwif.selectproc;
	hwif->reset_poll		= old_hwif.reset_poll;
	hwif->pre_reset			= old_hwif.pre_reset;
	hwif->resetproc			= old_hwif.resetproc;
	hwif->intrproc			= old_hwif.intrproc;
	hwif->maskproc			= old_hwif.maskproc;
	hwif->quirkproc			= old_hwif.quirkproc;
	hwif->busproc			= old_hwif.busproc;
#endif

#if 0
	hwif->pioops			= old_hwif.pioops;
#else
	hwif->ata_input_data		= old_hwif.ata_input_data;
	hwif->ata_output_data		= old_hwif.ata_output_data;
	hwif->atapi_input_bytes		= old_hwif.atapi_input_bytes;
	hwif->atapi_output_bytes	= old_hwif.atapi_output_bytes;
#endif

#if 0
	hwif->dmaops			= old_hwif.dmaops;
#else
	hwif->ide_dma_read		= old_hwif.ide_dma_read;
	hwif->ide_dma_write		= old_hwif.ide_dma_write;
	hwif->ide_dma_begin		= old_hwif.ide_dma_begin;
	hwif->ide_dma_end		= old_hwif.ide_dma_end;
	hwif->ide_dma_check		= old_hwif.ide_dma_check;
	hwif->ide_dma_on		= old_hwif.ide_dma_on;
	hwif->ide_dma_off		= old_hwif.ide_dma_off;
	hwif->ide_dma_off_quietly	= old_hwif.ide_dma_off_quietly;
	hwif->ide_dma_test_irq		= old_hwif.ide_dma_test_irq;
	hwif->ide_dma_host_on		= old_hwif.ide_dma_host_on;
	hwif->ide_dma_host_off		= old_hwif.ide_dma_host_off;
	hwif->ide_dma_bad_drive		= old_hwif.ide_dma_bad_drive;
	hwif->ide_dma_good_drive	= old_hwif.ide_dma_good_drive;
	hwif->ide_dma_count		= old_hwif.ide_dma_count;
	hwif->ide_dma_verbose		= old_hwif.ide_dma_verbose;
	hwif->ide_dma_retune		= old_hwif.ide_dma_retune;
	hwif->ide_dma_lostirq		= old_hwif.ide_dma_lostirq;
	hwif->ide_dma_timeout		= old_hwif.ide_dma_timeout;
#endif

#if 0
	hwif->iops			= old_hwif.iops;
#else
	hwif->OUTB		= old_hwif.OUTB;
	hwif->OUTW		= old_hwif.OUTW;
	hwif->OUTL		= old_hwif.OUTL;
	hwif->OUTSW		= old_hwif.OUTSW;
	hwif->OUTSL		= old_hwif.OUTSL;

	hwif->INB		= old_hwif.INB;
	hwif->INW		= old_hwif.INW;
	hwif->INL		= old_hwif.INL;
	hwif->INSW		= old_hwif.INSW;
	hwif->INSL		= old_hwif.INSL;
#endif

	hwif->mmio			= old_hwif.mmio;
	hwif->rqsize			= old_hwif.rqsize;
	hwif->addressing		= old_hwif.addressing;
#ifndef CONFIG_BLK_DEV_IDECS
	hwif->irq			= old_hwif.irq;
#endif /* CONFIG_BLK_DEV_IDECS */
	hwif->initializing		= old_hwif.initializing;

	hwif->dma_base			= old_hwif.dma_base;
	hwif->dma_master		= old_hwif.dma_master;
	hwif->dma_command		= old_hwif.dma_command;
	hwif->dma_vendor1		= old_hwif.dma_vendor1;
	hwif->dma_status		= old_hwif.dma_status;
	hwif->dma_vendor3		= old_hwif.dma_vendor3;
	hwif->dma_prdtable		= old_hwif.dma_prdtable;

	hwif->dma_extra			= old_hwif.dma_extra;
	hwif->config_data		= old_hwif.config_data;
	hwif->select_data		= old_hwif.select_data;
	hwif->autodma			= old_hwif.autodma;
	hwif->udma_four			= old_hwif.udma_four;
	hwif->no_dsc			= old_hwif.no_dsc;

	hwif->hwif_data			= old_hwif.hwif_data;
abort:
	spin_unlock_irqrestore(&ide_lock, flags);
}

EXPORT_SYMBOL(ide_unregister);

/**
 *	ide_setup_ports 	-	set up IDE interface ports
 *	@hw: register descriptions
 *	@base: base register
 *	@offsets: table of register offsets
 *	@ctrl: control register
 *	@ack_irq: IRQ ack
 *	@irq: interrupt lie
 *
 *	Setup hw_regs_t structure described by parameters.  You
 *	may set up the hw structure yourself OR use this routine to
 *	do it for you. This is basically a helper
 *
 */
 
void ide_setup_ports (	hw_regs_t *hw,
			ide_ioreg_t base, int *offsets,
			ide_ioreg_t ctrl, ide_ioreg_t intr,
			ide_ack_intr_t *ack_intr,
/*
 *			ide_io_ops_t *iops,
 */
			int irq)
{
	int i;

	for (i = 0; i < IDE_NR_PORTS; i++) {
		if (offsets[i] == -1) {
			switch(i) {
				case IDE_CONTROL_OFFSET:
					hw->io_ports[i] = ctrl;
					break;
#if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
				case IDE_IRQ_OFFSET:
					hw->io_ports[i] = intr;
					break;
#endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
				default:
					hw->io_ports[i] = 0;
					break;
			}
		} else {
			hw->io_ports[i] = base + offsets[i];
		}
	}
	hw->irq = irq;
	hw->dma = NO_DMA;
	hw->ack_intr = ack_intr;
/*
 *	hw->iops = iops;
 */
}

EXPORT_SYMBOL(ide_setup_ports);

/*
 * Register an IDE interface, specifing exactly the registers etc
 * Set init=1 iff calling before probes have taken place.
 */
int ide_register_hw (hw_regs_t *hw, ide_hwif_t **hwifp)
{
	int index, retry = 1;
	ide_hwif_t *hwif;

	do {
		for (index = 0; index < MAX_HWIFS; ++index) {
			hwif = &ide_hwifs[index];
			if (hwif->hw.io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
				goto found;
		}
		for (index = 0; index < MAX_HWIFS; ++index) {
			hwif = &ide_hwifs[index];
			if ((!hwif->present && !hwif->mate && !initializing) ||
			    (!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
				goto found;
		}
		for (index = 0; index < MAX_HWIFS; index++)
			ide_unregister(index);
	} while (retry--);
	return -1;
found:
	if (hwif->present)
		ide_unregister(index);
	if (hwif->present)
		return -1;
	memcpy(&hwif->hw, hw, sizeof(*hw));
	memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
	hwif->irq = hw->irq;
	hwif->noprobe = 0;
	hwif->chipset = hw->chipset;

	if (!initializing) {
		ide_probe_module();
#ifdef CONFIG_PROC_FS
		create_proc_ide_interfaces();
#endif
	}

	if (hwifp)
		*hwifp = hwif;

	return (initializing || hwif->present) ? index : -1;
}

EXPORT_SYMBOL(ide_register_hw);

/*
 * Compatability function with existing drivers.  If you want
 * something different, use the function above.
 */
int ide_register (int arg1, int arg2, int irq)
{
	hw_regs_t hw;
	ide_init_hwif_ports(&hw, (ide_ioreg_t) arg1, (ide_ioreg_t) arg2, NULL);
	hw.irq = irq;
	return ide_register_hw(&hw, NULL);
}

EXPORT_SYMBOL(ide_register);

/**
 *	ide_add_setting		-	attach an IDE setting
 *	drive: drive the setting is for
 *	name: name of setting
 *	rw: set if writable
 *	read_ioctl: read function
 *	write_ioctl: write function
 *	data_type: form expected
 *	min: minimum
 *	max: maximum
 *	mul_factor: multiply by
 *	div_factor: divide by
 *	data: value
 *	set: handling for setting
 *
 *	Add a setting to the IDE drive. Support automatic removal and allow
 *	all the work to be done by plugged in handlers. This code is also
 *	rather short on locking, but the current plan is to do the locking
 *	internally to the function. 
 */
 
void ide_add_setting (ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set)
{
	ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;

	while ((*p) && strcmp((*p)->name, name) < 0)
		p = &((*p)->next);
	if ((setting = kmalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
		goto abort;
	memset(setting, 0, sizeof(*setting));
	if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
		goto abort;
	strcpy(setting->name, name);
	setting->rw = rw;
	setting->read_ioctl = read_ioctl;
	setting->write_ioctl = write_ioctl;
	setting->data_type = data_type;
	setting->min = min;
	setting->max = max;
	setting->mul_factor = mul_factor;
	setting->div_factor = div_factor;
	setting->data = data;
	setting->set = set;
	setting->next = *p;
	if (drive->driver)
		setting->auto_remove = 1;
	*p = setting;
	return;
abort:
	if (setting)
		kfree(setting);
}

EXPORT_SYMBOL(ide_add_setting);

/**
 *	ide_remove_setting	-	remove an ioctl setting
 *	@name:	name of the property
 *
 *	Remove a drive ioctl setting that was created by ide_add_setting.
 *	Again this needs the locking fixed
 */
 
void ide_remove_setting (ide_drive_t *drive, char *name)
{
	ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting;

	while ((*p) && strcmp((*p)->name, name))
		p = &((*p)->next);
	if ((setting = (*p)) == NULL)
		return;
	(*p) = setting->next;
	kfree(setting->name);
	kfree(setting);
}

EXPORT_SYMBOL(ide_remove_setting);

/**
 *	ide_find_setting_by_ioctl	-	find a setting handler by its command
 *	@drive: drive to act for
 *	@cmd: ioctl command code
 *
 *	Scan the drive handlers for an ioctl handler for this function.
 *	The handlers vary by drive and sometimes by drive state. 
 *	Needs locking fixes.
 */
 
static ide_settings_t *ide_find_setting_by_ioctl (ide_drive_t *drive, int cmd)
{
	ide_settings_t *setting = drive->settings;

	while (setting) {
		if (setting->read_ioctl == cmd || setting->write_ioctl == cmd)
			break;
		setting = setting->next;
	}
	return setting;
}

/**
 *	ide_find_setting_by_name	-	find a setting handler by its name
 *	@drive: drive to act for
 *	@cmd: ioctl command code
 *
 *	Scan the drive handlers handler matching the name for this function.
 *	The handlers vary by drive and sometimes by drive state. 
 *	Needs locking fixes.
 */
 
ide_settings_t *ide_find_setting_by_name (ide_drive_t *drive, char *name)
{
	ide_settings_t *setting = drive->settings;

	while (setting) {
		if (strcmp(setting->name, name) == 0)
			break;
		setting = setting->next;
	}
	return setting;
}

/**
 *	auto_remove_settings	-	remove driver settings on a device
 *	@drive: drive to clean
 *
 *	Called when we change the driver bindings for a device, for 
 *	example if the device is hot plugged. We must scrub the driver
 *	bindings that are thus no longer relevant to the device in case
 *	it changes from say a CD-ROM to a disk
 *	Needs locking fixes
 */
 
static void auto_remove_settings (ide_drive_t *drive)
{
	ide_settings_t *setting;
repeat:
	setting = drive->settings;
	while (setting) {
		if (setting->auto_remove) {
			ide_remove_setting(drive, setting->name);
			goto repeat;
		}
		setting = setting->next;
	}
}

int ide_read_setting (ide_drive_t *drive, ide_settings_t *setting)
{
	int		val = -EINVAL;
	unsigned long	flags;

	if ((setting->rw & SETTING_READ)) {
		spin_lock_irqsave(&ide_lock, flags);
		switch(setting->data_type) {
			case TYPE_BYTE:
				val = *((u8 *) setting->data);
				break;
			case TYPE_SHORT:
				val = *((u16 *) setting->data);
				break;
			case TYPE_INT:
			case TYPE_INTA:
				val = *((u32 *) setting->data);
				break;
		}
		spin_unlock_irqrestore(&ide_lock, flags);
	}
	return val;
}

int ide_spin_wait_hwgroup (ide_drive_t *drive)
{
	ide_hwgroup_t *hwgroup = HWGROUP(drive);
	unsigned long timeout = jiffies + (3 * HZ);

	spin_lock_irq(&ide_lock);

	while (hwgroup->busy) {
		unsigned long lflags;
		spin_unlock_irq(&ide_lock);
		local_irq_set(lflags);
		if (time_after(jiffies, timeout)) {
			local_irq_restore(lflags);
			printk(KERN_ERR "%s: channel busy\n", drive->name);
			return -EBUSY;
		}
		local_irq_restore(lflags);
		spin_lock_irq(&ide_lock);
	}
	return 0;
}

EXPORT_SYMBOL(ide_spin_wait_hwgroup);

/*
 * FIXME:  This should be changed to enqueue a special request
 * to the driver to change settings, and then wait on a sema for completion.
 * The current scheme of polling is kludgey, though safe enough.
 */
int ide_write_setting (ide_drive_t *drive, ide_settings_t *setting, int val)
{
	int i;
	u32 *p;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (!(setting->rw & SETTING_WRITE))
		return -EPERM;
	if (val < setting->min || val > setting->max)
		return -EINVAL;
	if (setting->set)
		return setting->set(drive, val);
	if (ide_spin_wait_hwgroup(drive))
		return -EBUSY;
	switch (setting->data_type) {
		case TYPE_BYTE:
			*((u8 *) setting->data) = val;
			break;
		case TYPE_SHORT:
			*((u16 *) setting->data) = val;
			break;
		case TYPE_INT:
			*((u32 *) setting->data) = val;
			break;
		case TYPE_INTA:
			p = (u32 *) setting->data;
			for (i = 0; i < 1 << PARTN_BITS; i++, p++)
				*p = val;
			break;
	}
	spin_unlock_irq(&ide_lock);
	return 0;
}

EXPORT_SYMBOL(ide_write_setting);

static int set_io_32bit(ide_drive_t *drive, int arg)
{
	drive->io_32bit = arg;
#ifdef CONFIG_BLK_DEV_DTC2278
	if (HWIF(drive)->chipset == ide_dtc2278)
		HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
#endif /* CONFIG_BLK_DEV_DTC2278 */
	return 0;
}

static int set_using_dma (ide_drive_t *drive, int arg)
{
	if (!drive->driver || !DRIVER(drive)->supports_dma)
		return -EPERM;
	if (!drive->id || !(drive->id->capability & 1))
		return -EPERM;
	if (HWIF(drive)->ide_dma_check == NULL)
		return -EPERM;
	if (arg) {
		if (HWIF(drive)->ide_dma_on(drive)) return -EIO;
	} else {
		if (HWIF(drive)->ide_dma_off(drive)) return -EIO;
	}
	return 0;
}

static int set_pio_mode (ide_drive_t *drive, int arg)
{
	struct request rq;

	if (!HWIF(drive)->tuneproc)
		return -ENOSYS;
	if (drive->special.b.set_tune)
		return -EBUSY;
	ide_init_drive_cmd(&rq);
	drive->tune_req = (u8) arg;
	drive->special.b.set_tune = 1;
	(void) ide_do_drive_cmd(drive, &rq, ide_wait);
	return 0;
}

static int set_xfer_rate (ide_drive_t *drive, int arg)
{
	int err = ide_wait_cmd(drive,
			WIN_SETFEATURES, (u8) arg,
			SETFEATURES_XFER, 0, NULL);

	if (!err && arg) {
		ide_set_xfer_rate(drive, (u8) arg);
		ide_driveid_update(drive);
	}
	return err;
}

int ide_atapi_to_scsi (ide_drive_t *drive, int arg)
{
	if (drive->media == ide_disk) {
		drive->scsi = 0;
		return 0;
	}

	if (drive->driver != NULL) {
#if 0
		ide_unregister_subdriver(drive);
#else
		if (DRIVER(drive)->cleanup(drive)) {
			drive->scsi = 0;
			return 0;
		}
#endif
	}

	drive->scsi = (u8) arg;
	ata_attach(drive);
	return 0;
}

void ide_add_generic_settings (ide_drive_t *drive)
{
/*
 *			drive	setting name		read/write access				read ioctl		write ioctl		data type	min	max				mul_factor	div_factor	data pointer			set function
 */
	ide_add_setting(drive,	"io_32bit",		drive->no_io_32bit ? SETTING_READ : SETTING_RW,	HDIO_GET_32BIT,		HDIO_SET_32BIT,		TYPE_BYTE,	0,	1 + (SUPPORT_VLB_SYNC << 1),	1,		1,		&drive->io_32bit,		set_io_32bit);
	ide_add_setting(drive,	"keepsettings",		SETTING_RW,					HDIO_GET_KEEPSETTINGS,	HDIO_SET_KEEPSETTINGS,	TYPE_BYTE,	0,	1,				1,		1,		&drive->keep_settings,		NULL);
	ide_add_setting(drive,	"nice1",		SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	1,				1,		1,		&drive->nice1,			NULL);
	ide_add_setting(drive,	"pio_mode",		SETTING_WRITE,					-1,			HDIO_SET_PIO_MODE,	TYPE_BYTE,	0,	255,				1,		1,		NULL,				set_pio_mode);
	ide_add_setting(drive,	"slow",			SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	1,				1,		1,		&drive->slow,			NULL);
	ide_add_setting(drive,	"unmaskirq",		drive->no_unmask ? SETTING_READ : SETTING_RW,	HDIO_GET_UNMASKINTR,	HDIO_SET_UNMASKINTR,	TYPE_BYTE,	0,	1,				1,		1,		&drive->unmask,			NULL);
	ide_add_setting(drive,	"using_dma",		SETTING_RW,					HDIO_GET_DMA,		HDIO_SET_DMA,		TYPE_BYTE,	0,	1,				1,		1,		&drive->using_dma,		set_using_dma);
	ide_add_setting(drive,	"init_speed",		SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	70,				1,		1,		&drive->init_speed,		NULL);
	ide_add_setting(drive,	"current_speed",	SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	70,				1,		1,		&drive->current_speed,		set_xfer_rate);
	ide_add_setting(drive,	"number",		SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	3,				1,		1,		&drive->dn,			NULL);
	if (drive->media != ide_disk)
		ide_add_setting(drive,	"ide-scsi",		SETTING_RW,					-1,		HDIO_SET_IDE_SCSI,		TYPE_BYTE,	0,	1,				1,		1,		&drive->scsi,			ide_atapi_to_scsi);
}

/*
 * Delay for *at least* 50ms.  As we don't know how much time is left
 * until the next tick occurs, we wait an extra tick to be safe.
 * This is used only during the probing/polling for drives at boot time.
 *
 * However, its usefullness may be needed in other places, thus we export it now.
 * The future may change this to a millisecond setable delay.
 */
void ide_delay_50ms (void)
{
#ifndef CONFIG_BLK_DEV_IDECS
	mdelay(50);
#else
	__set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(HZ/20);
#endif /* CONFIG_BLK_DEV_IDECS */
}

EXPORT_SYMBOL(ide_delay_50ms);

int system_bus_clock (void)
{
	return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
}

EXPORT_SYMBOL(system_bus_clock);

/*
 *	Locking is badly broken here - since way back.  That sucker is
 * root-only, but that's not an excuse...  The real question is what
 * exclusion rules do we want here.
 */
int ide_replace_subdriver (ide_drive_t *drive, const char *driver)
{
	if (!drive->present || drive->usage || drive->dead)
		goto abort;
	if (drive->driver != NULL && DRIVER(drive)->cleanup(drive))
		goto abort;
	strncpy(drive->driver_req, driver, 9);
	if (ata_attach(drive)) {
		spin_lock(&drives_lock);
		list_del_init(&drive->list);
		spin_unlock(&drives_lock);
		drive->driver_req[0] = 0;
		ata_attach(drive);
	} else {
		drive->driver_req[0] = 0;
	}
	if (DRIVER(drive) && !strcmp(DRIVER(drive)->name, driver))
		return 0;
abort:
	return 1;
}

EXPORT_SYMBOL(ide_replace_subdriver);

int ata_attach(ide_drive_t *drive)
{
	struct list_head *p;
	spin_lock(&drivers_lock);
	list_for_each(p, &drivers) {
		ide_driver_t *driver = list_entry(p, ide_driver_t, drivers);
		if (!try_inc_mod_count(driver->owner))
			continue;
		spin_unlock(&drivers_lock);
		if (driver->attach(drive) == 0) {
			if (driver->owner)
				__MOD_DEC_USE_COUNT(driver->owner);
			drive->gendev.driver = &driver->gen_driver;
			return 0;
		}
		spin_lock(&drivers_lock);
		if (driver->owner)
			__MOD_DEC_USE_COUNT(driver->owner);
	}
	spin_unlock(&drivers_lock);
	spin_lock(&drives_lock);
	list_add_tail(&drive->list, &ata_unused);
	spin_unlock(&drives_lock);
	return 1;
}

EXPORT_SYMBOL(ata_attach);

int generic_ide_ioctl(struct block_device *bdev, unsigned int cmd,
			unsigned long arg)
{
	ide_drive_t *drive = bdev->bd_disk->private_data;
	ide_settings_t *setting;
	int err = 0;

	if ((setting = ide_find_setting_by_ioctl(drive, cmd)) != NULL) {
		if (cmd == setting->read_ioctl) {
			err = ide_read_setting(drive, setting);
			return err >= 0 ? put_user(err, (long *) arg) : err;
		} else {
			if (bdev != bdev->bd_contains)
				return -EINVAL;
			return ide_write_setting(drive, setting, arg);
		}
	}

	switch (cmd) {
		case HDIO_GETGEO:
		{
			struct hd_geometry *loc = (struct hd_geometry *) arg;
			u16 bios_cyl = drive->bios_cyl; /* truncate */
			if (!loc || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
			if (put_user(drive->bios_head, (u8 *) &loc->heads)) return -EFAULT;
			if (put_user(drive->bios_sect, (u8 *) &loc->sectors)) return -EFAULT;
			if (put_user(bios_cyl, (u16 *) &loc->cylinders)) return -EFAULT;
			if (put_user((unsigned)get_start_sect(bdev),
				(unsigned long *) &loc->start)) return -EFAULT;
			return 0;
		}

		case HDIO_GETGEO_BIG_RAW:
		{
			struct hd_big_geometry *loc = (struct hd_big_geometry *) arg;
			if (!loc || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
			if (put_user(drive->head, (u8 *) &loc->heads)) return -EFAULT;
			if (put_user(drive->sect, (u8 *) &loc->sectors)) return -EFAULT;
			if (put_user(drive->cyl, (unsigned int *) &loc->cylinders)) return -EFAULT;
			if (put_user((unsigned)get_start_sect(bdev),
				(unsigned long *) &loc->start)) return -EFAULT;
			return 0;
		}

		case HDIO_OBSOLETE_IDENTITY:
		case HDIO_GET_IDENTITY:
			if (bdev != bdev->bd_contains)
				return -EINVAL;
			if (drive->id == NULL)
				return -ENOMSG;
			if (copy_to_user((char *)arg, (char *)drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
				return -EFAULT;
			return 0;

		case HDIO_GET_NICE:
			return put_user(drive->dsc_overlap	<<	IDE_NICE_DSC_OVERLAP	|
					drive->atapi_overlap	<<	IDE_NICE_ATAPI_OVERLAP	|
					drive->nice0		<< 	IDE_NICE_0		|
					drive->nice1		<<	IDE_NICE_1		|
					drive->nice2		<<	IDE_NICE_2,
					(long *) arg);

#ifdef CONFIG_IDE_TASK_IOCTL
		case HDIO_DRIVE_TASKFILE:
		        if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
				return -EACCES;
			switch(drive->media) {
				case ide_disk:
					return ide_taskfile_ioctl(drive, cmd, arg);
#ifdef CONFIG_PKT_TASK_IOCTL
				case ide_cdrom:
				case ide_tape:
				case ide_floppy:
					return pkt_taskfile_ioctl(drive, cmd, arg);
#endif /* CONFIG_PKT_TASK_IOCTL */
				default:
					return -ENOMSG;
			}
#endif /* CONFIG_IDE_TASK_IOCTL */

		case HDIO_DRIVE_CMD:
			if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
				return -EACCES;
			return ide_cmd_ioctl(drive, cmd, arg);

		case HDIO_DRIVE_TASK:
			if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
				return -EACCES;
			return ide_task_ioctl(drive, cmd, arg);

		case HDIO_SCAN_HWIF:
		{
			int args[3];
			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
			if (copy_from_user(args, (void *)arg, 3 * sizeof(int)))
				return -EFAULT;
			if (ide_register(args[0], args[1], args[2]) == -1)
				return -EIO;
			return 0;
		}
	        case HDIO_UNREGISTER_HWIF:
			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
			/* (arg > MAX_HWIFS) checked in function */
			ide_unregister(arg);
			return 0;
		case HDIO_SET_NICE:
			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
			if (drive->driver == NULL)
				return -EPERM;
			if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
				return -EPERM;
			drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
			if (drive->dsc_overlap && !DRIVER(drive)->supports_dsc_overlap) {
				drive->dsc_overlap = 0;
				return -EPERM;
			}
			drive->nice1 = (arg >> IDE_NICE_1) & 1;
			return 0;
		case HDIO_DRIVE_RESET:
		{
			unsigned long flags;
			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
#if 1
			spin_lock_irqsave(&ide_lock, flags);
			if ( HWGROUP(drive)->handler != NULL) {
				printk(KERN_ERR "%s: ide_set_handler: handler not null; %p\n", drive->name, HWGROUP(drive)->handler);
				(void) HWGROUP(drive)->handler(drive);
//				HWGROUP(drive)->handler = NULL;
				HWGROUP(drive)->expiry	= NULL;
				del_timer(&HWGROUP(drive)->timer);
			}
			spin_unlock_irqrestore(&ide_lock, flags);

#endif
			(void) ide_do_reset(drive);
			if (drive->suspend_reset) {
/*
 *				APM WAKE UP todo !!
 *				int nogoodpower = 1;
 *				while(nogoodpower) {
 *					check_power1() or check_power2()
 *					nogoodpower = 0;
 *				} 
 *				HWIF(drive)->multiproc(drive);
 */
				return ioctl_by_bdev(bdev, BLKRRPART, 0);
			}
			return 0;
		}

		case CDROMEJECT:
		case CDROMCLOSETRAY:
			return scsi_cmd_ioctl(bdev, cmd, arg);

		case HDIO_GET_BUSSTATE:
			if (!capable(CAP_SYS_ADMIN))
				return -EACCES;
			if (put_user(HWIF(drive)->bus_state, (long *)arg))
				return -EFAULT;
			return 0;

		case HDIO_SET_BUSSTATE:
			if (!capable(CAP_SYS_ADMIN))
				return -EACCES;
			if (HWIF(drive)->busproc)
				HWIF(drive)->busproc(drive, (int)arg);
			return 0;

		default:
			return -EINVAL;
	}
}

EXPORT_SYMBOL(generic_ide_ioctl);

/*
 * stridx() returns the offset of c within s,
 * or -1 if c is '\0' or not found within s.
 */
static int __init stridx (const char *s, char c)
{
	char *i = strchr(s, c);
	return (i && c) ? i - s : -1;
}

/*
 * match_parm() does parsing for ide_setup():
 *
 * 1. the first char of s must be '='.
 * 2. if the remainder matches one of the supplied keywords,
 *     the index (1 based) of the keyword is negated and returned.
 * 3. if the remainder is a series of no more than max_vals numbers
 *     separated by commas, the numbers are saved in vals[] and a
 *     count of how many were saved is returned.  Base10 is assumed,
 *     and base16 is allowed when prefixed with "0x".
 * 4. otherwise, zero is returned.
 */
static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
{
	static const char *decimal = "0123456789";
	static const char *hex = "0123456789abcdef";
	int i, n;

	if (*s++ == '=') {
		/*
		 * Try matching against the supplied keywords,
		 * and return -(index+1) if we match one
		 */
		if (keywords != NULL) {
			for (i = 0; *keywords != NULL; ++i) {
				if (!strcmp(s, *keywords++))
					return -(i+1);
			}
		}
		/*
		 * Look for a series of no more than "max_vals"
		 * numeric values separated by commas, in base10,
		 * or base16 when prefixed with "0x".
		 * Return a count of how many were found.
		 */
		for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
			vals[n] = i;
			while ((i = stridx(decimal, *++s)) >= 0)
				vals[n] = (vals[n] * 10) + i;
			if (*s == 'x' && !vals[n]) {
				while ((i = stridx(hex, *++s)) >= 0)
					vals[n] = (vals[n] * 0x10) + i;
			}
			if (++n == max_vals)
				break;
			if (*s == ',' || *s == ';')
				++s;
		}
		if (!*s)
			return n;
	}
	return 0;	/* zero = nothing matched */
}

/*
 * ide_setup() gets called VERY EARLY during initialization,
 * to handle kernel "command line" strings beginning with "hdx="
 * or "ide".  Here is the complete set currently supported:
 *
 * "hdx="  is recognized for all "x" from "a" to "h", such as "hdc".
 * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
 *
 * "hdx=noprobe"	: drive may be present, but do not probe for it
 * "hdx=none"		: drive is NOT present, ignore cmos and do not probe
 * "hdx=nowerr"		: ignore the WRERR_STAT bit on this drive
 * "hdx=cdrom"		: drive is present, and is a cdrom drive
 * "hdx=cyl,head,sect"	: disk drive is present, with specified geometry
 * "hdx=noremap"	: do not remap 0->1 even though EZD was detected
 * "hdx=autotune"	: driver will attempt to tune interface speed
 *				to the fastest PIO mode supported,
 *				if possible for this drive only.
 *				Not fully supported by all chipset types,
 *				and quite likely to cause trouble with
 *				older/odd IDE drives.
 * "hdx=biostimings"	: driver will NOT attempt to tune interface speed 
 * 				(DMA/PIO) but always honour BIOS timings.
 * "hdx=slow"		: insert a huge pause after each access to the data
 *				port. Should be used only as a last resort.
 *
 * "hdx=swapdata"	: when the drive is a disk, byte swap all data
 * "hdx=bswap"		: same as above..........
 * "hdxlun=xx"          : set the drive last logical unit.
 * "hdx=flash"		: allows for more than one ata_flash disk to be
 *				registered. In most cases, only one device
 *				will be present.
 * "hdx=scsi"		: the return of the ide-scsi flag, this is useful for
 *				allowwing ide-floppy, ide-tape, and ide-cdrom|writers
 *				to use ide-scsi emulation on a device specific option.
 * "idebus=xx"		: inform IDE driver of VESA/PCI bus speed in MHz,
 *				where "xx" is between 20 and 66 inclusive,
 *				used when tuning chipset PIO modes.
 *				For PCI bus, 25 is correct for a P75 system,
 *				30 is correct for P90,P120,P180 systems,
 *				and 33 is used for P100,P133,P166 systems.
 *				If in doubt, use idebus=33 for PCI.
 *				As for VLB, it is safest to not specify it.
 *
 * "idex=noprobe"	: do not attempt to access/use this interface
 * "idex=base"		: probe for an interface at the addr specified,
 *				where "base" is usually 0x1f0 or 0x170
 *				and "ctl" is assumed to be "base"+0x206
 * "idex=base,ctl"	: specify both base and ctl
 * "idex=base,ctl,irq"	: specify base, ctl, and irq number
 * "idex=autotune"	: driver will attempt to tune interface speed
 *				to the fastest PIO mode supported,
 *				for all drives on this interface.
 *				Not fully supported by all chipset types,
 *				and quite likely to cause trouble with
 *				older/odd IDE drives.
 * "idex=noautotune"	: driver will NOT attempt to tune interface speed
 *				This is the default for most chipsets,
 *				except the cmd640.
 * "idex=biostimings"	: driver will NOT attempt to tune interface speed 
 * 				(DMA/PIO) but always honour BIOS timings.
 * "idex=serialize"	: do not overlap operations on idex and ide(x^1)
 * "idex=four"		: four drives on idex and ide(x^1) share same ports
 * "idex=reset"		: reset interface before first use
 * "idex=dma"		: enable DMA by default on both drives if possible
 * "idex=ata66"		: informs the interface that it has an 80c cable
 *				for chipsets that are ATA-66 capable, but
 *				the ablity to bit test for detection is
 *				currently unknown.
 * "ide=reverse"	: Formerly called to pci sub-system, but now local.
 *
 * The following are valid ONLY on ide0, (except dc4030)
 * and the defaults for the base,ctl ports must not be altered.
 *
 * "ide0=dtc2278"	: probe/support DTC2278 interface
 * "ide0=ht6560b"	: probe/support HT6560B interface
 * "ide0=cmd640_vlb"	: *REQUIRED* for VLB cards with the CMD640 chip
 *			  (not for PCI -- automatically detected)
 * "ide0=qd65xx"	: probe/support qd65xx interface
 * "ide0=ali14xx"	: probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
 * "ide0=umc8672"	: probe/support umc8672 chipsets
 * "idex=dc4030"	: probe/support Promise DC4030VL interface
 * "ide=doubler"	: probe/support IDE doublers on Amiga
 */
int __init ide_setup (char *s)
{
	int i, vals[3];
	ide_hwif_t *hwif;
	ide_drive_t *drive;
	unsigned int hw, unit;
	const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
	const char max_hwif  = '0' + (MAX_HWIFS - 1);

	
	if (strncmp(s,"hd",2) == 0 && s[2] == '=')	/* hd= is for hd.c   */
		return 0;				/* driver and not us */

	if (strncmp(s,"ide",3) &&
	    strncmp(s,"idebus",6) &&
	    strncmp(s,"hd",2))		/* hdx= & hdxlun= */
		return 0;

	printk(KERN_INFO "ide_setup: %s", s);
	init_ide_data ();

#ifdef CONFIG_BLK_DEV_IDEDOUBLER
	if (!strcmp(s, "ide=doubler")) {
		extern int ide_doubler;

		printk(" : Enabled support for IDE doublers\n");
		ide_doubler = 1;
		return 1;
	}
#endif /* CONFIG_BLK_DEV_IDEDOUBLER */

	if (!strcmp(s, "ide=nodma")) {
		printk("IDE: Prevented DMA\n");
		noautodma = 1;
		return 1;
	}

#ifdef CONFIG_BLK_DEV_IDEPCI
	if (!strcmp(s, "ide=reverse")) {
		ide_scan_direction = 1;
		printk(" : Enabled support for IDE inverse scan order.\n");
		return 1;
	}
#endif /* CONFIG_BLK_DEV_IDEPCI */

	/*
	 * Look for drive options:  "hdx="
	 */
	if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
		const char *hd_words[] = {"none", "noprobe", "nowerr", "cdrom",
				"serialize", "autotune", "noautotune",
				"slow", "swapdata", "bswap", "flash",
				"remap", "noremap", "scsi", "biostimings",
				NULL};
		unit = s[2] - 'a';
		hw   = unit / MAX_DRIVES;
		unit = unit % MAX_DRIVES;
		hwif = &ide_hwifs[hw];
		drive = &hwif->drives[unit];
		if (strncmp(s + 4, "ide-", 4) == 0) {
			strncpy(drive->driver_req, s + 4, 9);
			goto done;
		}
		/*
		 * Look for last lun option:  "hdxlun="
		 */
		if (s[3] == 'l' && s[4] == 'u' && s[5] == 'n') {
			if (match_parm(&s[6], NULL, vals, 1) != 1)
				goto bad_option;
			if (vals[0] >= 0 && vals[0] <= 7) {
				drive->last_lun = vals[0];
				drive->forced_lun = 1;
			} else
				printk(" -- BAD LAST LUN! Expected value from 0 to 7");
			goto done;
		}
		switch (match_parm(&s[3], hd_words, vals, 3)) {
			case -1: /* "none" */
				drive->nobios = 1;  /* drop into "noprobe" */
			case -2: /* "noprobe" */
				drive->noprobe = 1;
				goto done;
			case -3: /* "nowerr" */
				drive->bad_wstat = BAD_R_STAT;
				hwif->noprobe = 0;
				goto done;
			case -4: /* "cdrom" */
				drive->present = 1;
				drive->media = ide_cdrom;
				hwif->noprobe = 0;
				goto done;
			case -5: /* "serialize" */
				printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
				goto do_serialize;
			case -6: /* "autotune" */
				drive->autotune = IDE_TUNE_AUTO;
				goto done;
			case -7: /* "noautotune" */
				drive->autotune = IDE_TUNE_NOAUTO;
				goto done;
			case -8: /* "slow" */
				drive->slow = 1;
				goto done;
			case -9: /* "swapdata" or "bswap" */
			case -10:
				drive->bswap = 1;
				goto done;
			case -11: /* "flash" */
				drive->ata_flash = 1;
				goto done;
			case -12: /* "remap" */
				drive->remap_0_to_1 = 1;
				goto done;
			case -13: /* "noremap" */
				drive->remap_0_to_1 = 2;
				goto done;
			case -14: /* "scsi" */
#if defined(CONFIG_BLK_DEV_IDESCSI) && defined(CONFIG_SCSI)
				drive->scsi = 1;
				goto done;
#else
				drive->scsi = 0;
				goto bad_option;
#endif /* defined(CONFIG_BLK_DEV_IDESCSI) && defined(CONFIG_SCSI) */
			case -15: /* "biostimings" */
				drive->autotune = IDE_TUNE_BIOS;
				goto done;
			case 3: /* cyl,head,sect */
				drive->media	= ide_disk;
				drive->cyl	= drive->bios_cyl  = vals[0];
				drive->head	= drive->bios_head = vals[1];
				drive->sect	= drive->bios_sect = vals[2];
				drive->present	= 1;
				drive->forced_geom = 1;
				hwif->noprobe = 0;
				goto done;
			default:
				goto bad_option;
		}
	}

	if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
		goto bad_option;
	/*
	 * Look for bus speed option:  "idebus="
	 */
	if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
		if (match_parm(&s[6], NULL, vals, 1) != 1)
			goto bad_option;
		if (vals[0] >= 20 && vals[0] <= 66) {
			idebus_parameter = vals[0];
		} else
			printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
		goto done;
	}
	/*
	 * Look for interface options:  "idex="
	 */
	if (s[3] >= '0' && s[3] <= max_hwif) {
		/*
		 * Be VERY CAREFUL changing this: note hardcoded indexes below
		 * -8,-9,-10 : are reserved for future idex calls to ease the hardcoding.
		 */
		const char *ide_words[] = {
			"noprobe", "serialize", "autotune", "noautotune", 
			"reset", "dma", "ata66", "minus8", "minus9", "minus10",
			"four", "qd65xx", "ht6560b", "cmd640_vlb", "dtc2278", 
			"umc8672", "ali14xx", "dc4030", "biostimings", NULL };
		hw = s[3] - '0';
		hwif = &ide_hwifs[hw];
		i = match_parm(&s[4], ide_words, vals, 3);

		/*
		 * Cryptic check to ensure chipset not already set for hwif:
		 */
		if (i > 0 || i <= -11) {			/* is parameter a chipset name? */
			if (hwif->chipset != ide_unknown)
				goto bad_option;	/* chipset already specified */
			if (i <= -11 && i != -18 && hw != 0)
				goto bad_hwif;		/* chipset drivers are for "ide0=" only */
			if (i <= -11 && i != -18 && ide_hwifs[hw+1].chipset != ide_unknown)
				goto bad_option;	/* chipset for 2nd port already specified */
			printk("\n");
		}

		switch (i) {
			case -19: /* "biostimings" */
				hwif->drives[0].autotune = IDE_TUNE_BIOS;
				hwif->drives[1].autotune = IDE_TUNE_BIOS;
				goto done;
#ifdef CONFIG_BLK_DEV_PDC4030
			case -18: /* "dc4030" */
			{
				extern void init_pdc4030(void);
				init_pdc4030();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_PDC4030 */
#ifdef CONFIG_BLK_DEV_ALI14XX
			case -17: /* "ali14xx" */
			{
				extern void init_ali14xx (void);
				init_ali14xx();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_ALI14XX */
#ifdef CONFIG_BLK_DEV_UMC8672
			case -16: /* "umc8672" */
			{
				extern void init_umc8672 (void);
				init_umc8672();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_UMC8672 */
#ifdef CONFIG_BLK_DEV_DTC2278
			case -15: /* "dtc2278" */
			{
				extern void init_dtc2278 (void);
				init_dtc2278();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_DTC2278 */
#ifdef CONFIG_BLK_DEV_CMD640
			case -14: /* "cmd640_vlb" */
			{
				extern int cmd640_vlb; /* flag for cmd640.c */
				cmd640_vlb = 1;
				goto done;
			}
#endif /* CONFIG_BLK_DEV_CMD640 */
#ifdef CONFIG_BLK_DEV_HT6560B
			case -13: /* "ht6560b" */
			{
				extern void init_ht6560b (void);
				init_ht6560b();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_HT6560B */
#if CONFIG_BLK_DEV_QD65XX
			case -12: /* "qd65xx" */
			{
				extern void init_qd65xx (void);
				init_qd65xx();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_QD65XX */
#ifdef CONFIG_BLK_DEV_4DRIVES
			case -11: /* "four" drives on one set of ports */
			{
				ide_hwif_t *mate = &ide_hwifs[hw^1];
				mate->drives[0].select.all ^= 0x20;
				mate->drives[1].select.all ^= 0x20;
				hwif->chipset = mate->chipset = ide_4drives;
				mate->irq = hwif->irq;
				memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
				goto do_serialize;
			}
#endif /* CONFIG_BLK_DEV_4DRIVES */
			case -10: /* minus10 */
			case -9: /* minus9 */
			case -8: /* minus8 */
				goto bad_option;
			case -7: /* ata66 */
#ifdef CONFIG_BLK_DEV_IDEPCI
				hwif->udma_four = 1;
				goto done;
#else /* !CONFIG_BLK_DEV_IDEPCI */
				hwif->udma_four = 0;
				goto bad_hwif;
#endif /* CONFIG_BLK_DEV_IDEPCI */
			case -6: /* dma */
				hwif->autodma = 1;
				goto done;
			case -5: /* "reset" */
				hwif->reset = 1;
				goto done;
			case -4: /* "noautotune" */
				hwif->drives[0].autotune = IDE_TUNE_NOAUTO;
				hwif->drives[1].autotune = IDE_TUNE_NOAUTO;
				goto done;
			case -3: /* "autotune" */
				hwif->drives[0].autotune = IDE_TUNE_AUTO;
				hwif->drives[1].autotune = IDE_TUNE_AUTO;
				goto done;
			case -2: /* "serialize" */
			do_serialize:
				hwif->mate = &ide_hwifs[hw^1];
				hwif->mate->mate = hwif;
				hwif->serialized = hwif->mate->serialized = 1;
				goto done;

			case -1: /* "noprobe" */
				hwif->noprobe = 1;
				goto done;

			case 1:	/* base */
				vals[1] = vals[0] + 0x206; /* default ctl */
			case 2: /* base,ctl */
				vals[2] = 0;	/* default irq = probe for it */
			case 3: /* base,ctl,irq */
				hwif->hw.irq = vals[2];
				ide_init_hwif_ports(&hwif->hw, (ide_ioreg_t) vals[0], (ide_ioreg_t) vals[1], &hwif->irq);
				memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
				hwif->irq      = vals[2];
				hwif->noprobe  = 0;
				hwif->chipset  = ide_generic;
				goto done;

			case 0: goto bad_option;
			default:
				printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
				return 1;
		}
	}
bad_option:
	printk(" -- BAD OPTION\n");
	return 1;
bad_hwif:
	printk("-- NOT SUPPORTED ON ide%d", hw);
done:
	printk("\n");
	return 1;
}

/*
 * probe_for_hwifs() finds/initializes "known" IDE interfaces
 */
static void __init probe_for_hwifs (void)
{
#ifdef CONFIG_BLK_DEV_IDEPCI
	if (pci_present())
	{
		ide_scan_pcibus(ide_scan_direction);
	}
#endif /* CONFIG_BLK_DEV_IDEPCI */

#ifdef CONFIG_ETRAX_IDE
	{
		extern void init_e100_ide(void);
		init_e100_ide();
	}
#endif /* CONFIG_ETRAX_IDE */
#ifdef CONFIG_BLK_DEV_CMD640
	{
		extern void ide_probe_for_cmd640x(void);
		ide_probe_for_cmd640x();
	}
#endif /* CONFIG_BLK_DEV_CMD640 */
#ifdef CONFIG_BLK_DEV_PDC4030
	{
		extern int ide_probe_for_pdc4030(void);
		(void) ide_probe_for_pdc4030();
	}
#endif /* CONFIG_BLK_DEV_PDC4030 */
#ifdef CONFIG_BLK_DEV_IDE_PMAC
	{
		extern void pmac_ide_probe(void);
		pmac_ide_probe();
	}
#endif /* CONFIG_BLK_DEV_IDE_PMAC */
#ifdef CONFIG_BLK_DEV_IDE_SWARM
	{
		extern void swarm_ide_probe(void);
		swarm_ide_probe();
	}
#endif /* CONFIG_BLK_DEV_IDE_SWARM */
#ifdef CONFIG_BLK_DEV_GAYLE
	{
		extern void gayle_init(void);
		gayle_init();
	}
#endif /* CONFIG_BLK_DEV_GAYLE */
#ifdef CONFIG_BLK_DEV_FALCON_IDE
	{
		extern void falconide_init(void);
		falconide_init();
	}
#endif /* CONFIG_BLK_DEV_FALCON_IDE */
#ifdef CONFIG_BLK_DEV_MAC_IDE
	{
		extern void macide_init(void);
		macide_init();
	}
#endif /* CONFIG_BLK_DEV_MAC_IDE */
#ifdef CONFIG_BLK_DEV_Q40IDE
	{
		extern void q40ide_init(void);
		q40ide_init();
	}
#endif /* CONFIG_BLK_DEV_Q40IDE */
#ifdef CONFIG_BLK_DEV_BUDDHA
	{
		extern void buddha_init(void);
		buddha_init();
	}
#endif /* CONFIG_BLK_DEV_BUDDHA */
#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_ISAPNP)
	{
		extern void pnpide_init(int enable);
		pnpide_init(1);
	}
#endif /* CONFIG_BLK_DEV_ISAPNP */
}

void __init ide_init_builtin_drivers (void)
{
	/*
	 * Probe for special PCI and other "known" interface chipsets
	 */
	probe_for_hwifs ();

#ifdef CONFIG_BLK_DEV_IDE
	if (ide_hwifs[0].io_ports[IDE_DATA_OFFSET])
		ide_get_lock(&ide_intr_lock, NULL, NULL); /* for atari only */

	(void) ideprobe_init();

	if (ide_hwifs[0].io_ports[IDE_DATA_OFFSET])
		ide_release_lock(&ide_intr_lock);	/* for atari only */
#endif /* CONFIG_BLK_DEV_IDE */

#ifdef CONFIG_PROC_FS
	proc_ide_create();
#endif
}

/*
 *	Actually unregister the subdriver. Called with the
 *	request lock dropped.
 */
 
static int default_cleanup (ide_drive_t *drive)
{
	return ide_unregister_subdriver(drive);
}

/*
 *	Check if we can unregister the subdriver. Called with the
 *	request lock held.
 */
 
static int default_shutdown(ide_drive_t *drive)
{
	if (drive->usage || drive->driver == NULL || DRIVER(drive)->busy) {
		return 1;
	}
	drive->dead = 1;
	return 0;
}

/*
 *	Default function to use for the cache flush operation. This
 *	must be replaced for disk devices (see ATA specification
 *	documents on cache flush and drive suspend rules)
 *
 *	If we have no device attached or the device is not writable
 *	this handler is sufficient.
 */
 
static int default_flushcache (ide_drive_t *drive)
{
	return 0;
}

static ide_startstop_t default_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
{
	ide_end_request(drive, 0, 0);
	return ide_stopped;
}

static int default_end_request (ide_drive_t *drive, int uptodate, int nr_sects)
{
	return ide_end_request(drive, uptodate, nr_sects);
}

static u8 default_sense (ide_drive_t *drive, const char *msg, u8 stat)
{
	return ide_dump_status(drive, msg, stat);
}

static ide_startstop_t default_error (ide_drive_t *drive, const char *msg, u8 stat)
{
	return ide_error(drive, msg, stat);
}

static void default_pre_reset (ide_drive_t *drive)
{
}

static unsigned long default_capacity (ide_drive_t *drive)
{
	return 0x7fffffff;
}

static ide_startstop_t default_special (ide_drive_t *drive)
{
	special_t *s = &drive->special;

	s->all = 0;
	drive->mult_req = 0;
	return ide_stopped;
}

static int default_attach (ide_drive_t *drive)
{
	printk(KERN_ERR "%s: does not support hotswap of device class !\n",
		drive->name);

	return 0;
}

static void setup_driver_defaults (ide_drive_t *drive)
{
	ide_driver_t *d = drive->driver;

	if (d->cleanup == NULL)		d->cleanup = default_cleanup;
	if (d->shutdown == NULL)	d->shutdown = default_shutdown;
	if (d->flushcache == NULL)	d->flushcache = default_flushcache;
	if (d->do_request == NULL)	d->do_request = default_do_request;
	if (d->end_request == NULL)	d->end_request = default_end_request;
	if (d->sense == NULL)		d->sense = default_sense;
	if (d->error == NULL)		d->error = default_error;
	if (d->pre_reset == NULL)	d->pre_reset = default_pre_reset;
	if (d->capacity == NULL)	d->capacity = default_capacity;
	if (d->special == NULL)		d->special = default_special;
	if (d->attach == NULL)		d->attach = default_attach;
}

int ide_register_subdriver (ide_drive_t *drive, ide_driver_t *driver, int version)
{
	unsigned long flags;
	
	spin_lock_irqsave(&ide_lock, flags);
	if (version != IDE_SUBDRIVER_VERSION || !drive->present ||
	    drive->driver != NULL || drive->usage || drive->dead) {
		spin_unlock_irqrestore(&ide_lock, flags);
		return 1;
	}
	drive->driver = driver;
	setup_driver_defaults(drive);
	spin_unlock_irqrestore(&ide_lock, flags);
	spin_lock(&drives_lock);
	list_add(&drive->list, &driver->drives);
	spin_unlock(&drives_lock);
	if ((drive->autotune == IDE_TUNE_DEFAULT) ||
		(drive->autotune == IDE_TUNE_AUTO)) {
		/* DMA timings and setup moved to ide-probe.c */
		if (!driver->supports_dma && HWIF(drive)->ide_dma_off_quietly)
//			HWIF(drive)->ide_dma_off_quietly(drive);
			HWIF(drive)->ide_dma_off(drive);
		drive->dsc_overlap = (drive->next != drive && driver->supports_dsc_overlap);
		drive->nice1 = 1;
	}
	drive->suspend_reset = 0;
#ifdef CONFIG_PROC_FS
	ide_add_proc_entries(drive->proc, generic_subdriver_entries, drive);
	ide_add_proc_entries(drive->proc, driver->proc, drive);
#endif
	return 0;
}

EXPORT_SYMBOL(ide_register_subdriver);

int ide_unregister_subdriver (ide_drive_t *drive)
{
	unsigned long flags;
	
	spin_lock_irqsave(&ide_lock, flags);
	if (drive->usage || drive->driver == NULL || DRIVER(drive)->busy) {
		spin_unlock_irqrestore(&ide_lock, flags);
		return 1;
	}
#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_ISAPNP) && defined(MODULE)
	pnpide_init(0);
#endif /* CONFIG_BLK_DEV_ISAPNP */
#ifdef CONFIG_PROC_FS
	ide_remove_proc_entries(drive->proc, DRIVER(drive)->proc);
	ide_remove_proc_entries(drive->proc, generic_subdriver_entries);
#endif
	auto_remove_settings(drive);
	drive->driver = NULL;
	spin_unlock_irqrestore(&ide_lock, flags);
	spin_lock(&drives_lock);
	list_del_init(&drive->list);
	spin_unlock(&drives_lock);
	return 0;
}

EXPORT_SYMBOL(ide_unregister_subdriver);

static int ide_drive_remove(struct device * dev)
{
	ide_drive_t * drive = container_of(dev,ide_drive_t,gendev);
	ide_driver_t * driver = drive->driver;

	if (driver && driver->cleanup)
		driver->cleanup(drive);
	return 0;
}

int ide_register_driver(ide_driver_t *driver)
{
	struct list_head list;

	spin_lock(&drivers_lock);
	list_add(&driver->drivers, &drivers);
	spin_unlock(&drivers_lock);

	spin_lock(&drives_lock);
	INIT_LIST_HEAD(&list);
	list_splice_init(&ata_unused, &list);
	spin_unlock(&drives_lock);

	while (!list_empty(&list)) {
		ide_drive_t *drive = list_entry(list.next, ide_drive_t, list);
		list_del_init(&drive->list);
		ata_attach(drive);
	}
	driver->gen_driver.name = (char *) driver->name;
	driver->gen_driver.bus = &ide_bus_type;
	driver->gen_driver.remove = ide_drive_remove;
	return driver_register(&driver->gen_driver);
}

EXPORT_SYMBOL(ide_register_driver);

void ide_unregister_driver(ide_driver_t *driver)
{
	ide_drive_t *drive;

	spin_lock(&drivers_lock);
	list_del(&driver->drivers);
	spin_unlock(&drivers_lock);

	while(!list_empty(&driver->drives)) {
		drive = list_entry(driver->drives.next, ide_drive_t, list);
		if (driver->cleanup(drive)) {
			printk(KERN_ERR "%s: cleanup_module() called while still busy\n", drive->name);
			BUG();
		}
		/* We must remove proc entries defined in this module.
		   Otherwise we oops while accessing these entries */
#ifdef CONFIG_PROC_FS
		if (drive->proc)
			ide_remove_proc_entries(drive->proc, driver->proc);
#endif
		ata_attach(drive);
	}
}

EXPORT_SYMBOL(ide_unregister_driver);

struct block_device_operations ide_fops[] = {{
	.owner		= THIS_MODULE,
	.open		= ide_open,
}};

EXPORT_SYMBOL(ide_fops);

/*
 * Probe module
 */

EXPORT_SYMBOL(ide_lock);
EXPORT_SYMBOL(ide_probe);

struct bus_type ide_bus_type = {
	.name		= "ide",
};

/*
 * This is gets invoked once during initialization, to set *everything* up
 */
int __init ide_init (void)
{
	static char banner_printed;
	if (!banner_printed) {
		printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
		devfs_mk_dir(NULL, "ide", NULL);
		system_bus_speed = ide_system_bus_speed();
		banner_printed = 1;
	}

	bus_register(&ide_bus_type);

	init_ide_data();

	initializing = 1;
	ide_init_builtin_drivers();
	initializing = 0;

	return 0;
}

#ifdef MODULE
char *options = NULL;
MODULE_PARM(options,"s");
MODULE_LICENSE("GPL");

static void __init parse_options (char *line)
{
	char *next = line;

	if (line == NULL || !*line)
		return;
	while ((line = next) != NULL) {
 		if ((next = strchr(line,' ')) != NULL)
			*next++ = 0;
		if (!ide_setup(line))
			printk (KERN_INFO "Unknown option '%s'\n", line);
	}
}

int init_module (void)
{
	parse_options(options);
	return ide_init();
}

void cleanup_module (void)
{
	int index;

	for (index = 0; index < MAX_HWIFS; ++index) {
		ide_unregister(index);
#if !defined(CONFIG_DMA_NONPCI)
		if (ide_hwifs[index].dma_base)
			(void) ide_release_dma(&ide_hwifs[index]);
#endif /* !(CONFIG_DMA_NONPCI) */
	}

#ifdef CONFIG_PROC_FS
	proc_ide_destroy();
#endif
	devfs_remove("ide");

	bus_unregister(&ide_bus_type);
}

#else /* !MODULE */

__setup("", ide_setup);

module_init(ide_init);

#endif /* MODULE */
