drivers/ide/ide-iops.c - kernel/msm-4.19 - Gitiles

 /*
  *  Copyright (C) 2000-2002	Andre Hedrick <andre@linux-ide.org>
  *  Copyright (C) 2003		Red Hat
  *
  */

 #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/pci.h>
 #include <linux/delay.h>
 #include <linux/ide.h>
 #include <linux/bitops.h>
 #include <linux/nmi.h>

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

 void SELECT_DRIVE(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	const struct ide_port_ops *port_ops = hwif->port_ops;
 	struct ide_cmd cmd;

 	if (port_ops && port_ops->selectproc)
 		port_ops->selectproc(drive);

 	memset(&cmd, 0, sizeof(cmd));
 	cmd.tf_flags = IDE_TFLAG_OUT_DEVICE;

 	drive->hwif->tp_ops->tf_load(drive, &cmd);
 }

 void SELECT_MASK(ide_drive_t *drive, int mask)
 {
 	const struct ide_port_ops *port_ops = drive->hwif->port_ops;

 	if (port_ops && port_ops->maskproc)
 		port_ops->maskproc(drive, mask);
 }

 u8 ide_read_error(ide_drive_t *drive)
 {
 	struct ide_cmd cmd;

 	memset(&cmd, 0, sizeof(cmd));
 	cmd.tf_flags = IDE_TFLAG_IN_FEATURE;

 	drive->hwif->tp_ops->tf_read(drive, &cmd);

 	return cmd.tf.error;
 }
 EXPORT_SYMBOL_GPL(ide_read_error);

 void ide_fix_driveid(u16 *id)
 {
 #ifndef __LITTLE_ENDIAN
 # ifdef __BIG_ENDIAN
 	int i;

 	for (i = 0; i < 256; i++)
 		id[i] = __le16_to_cpu(id[i]);
 # else
 #  error "Please fix <asm/byteorder.h>"
 # endif
 #endif
 }

 /*
  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
  * removing leading/trailing blanks and compressing internal blanks.
  * It is primarily used to tidy up the model name/number fields as
  * returned by the ATA_CMD_ID_ATA[PI] commands.
  */

 void ide_fixstring(u8 *s, const int bytecount, const int byteswap)
 {
 	u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */

 	if (byteswap) {
 		/* convert from big-endian to host byte order */
 		for (p = s ; p != end ; p += 2)
 			be16_to_cpus((u16 *) p);
 	}

 	/* strip leading blanks */
 	p = s;
 	while (s != end && *s == ' ')
 		++s;
 	/* compress internal blanks and strip trailing blanks */
 	while (s != end && *s) {
 		if (*s++ != ' ' || (s != end && *s && *s != ' '))
 			*p++ = *(s-1);
 	}
 	/* wipe out trailing garbage */
 	while (p != end)
 		*p++ = '\0';
 }
 EXPORT_SYMBOL(ide_fixstring);

 /*
  * This routine busy-waits for the drive status to be not "busy".
  * It then checks the status for all of the "good" bits and none
  * of the "bad" bits, and if all is okay it returns 0.  All other
  * cases return error -- caller may then invoke ide_error().
  *
  * This routine should get fixed to not hog the cpu during extra long waits..
  * That could be done by busy-waiting for the first jiffy or two, and then
  * setting a timer to wake up at half second intervals thereafter,
  * until timeout is achieved, before timing out.
  */
 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
 			   unsigned long timeout, u8 *rstat)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 	unsigned long flags;
 	int i;
 	u8 stat;

 	udelay(1);	/* spec allows drive 400ns to assert "BUSY" */
 	stat = tp_ops->read_status(hwif);

 	if (stat & ATA_BUSY) {
 		local_save_flags(flags);
 		local_irq_enable_in_hardirq();
 		timeout += jiffies;
 		while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
 			if (time_after(jiffies, timeout)) {
 				/*
 				 * One last read after the timeout in case
 				 * heavy interrupt load made us not make any
 				 * progress during the timeout..
 				 */
 				stat = tp_ops->read_status(hwif);
 				if ((stat & ATA_BUSY) == 0)
 					break;

 				local_irq_restore(flags);
 				*rstat = stat;
 				return -EBUSY;
 			}
 		}
 		local_irq_restore(flags);
 	}
 	/*
 	 * Allow status to settle, then read it again.
 	 * A few rare drives vastly violate the 400ns spec here,
 	 * so we'll wait up to 10usec for a "good" status
 	 * rather than expensively fail things immediately.
 	 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 	 */
 	for (i = 0; i < 10; i++) {
 		udelay(1);
 		stat = tp_ops->read_status(hwif);

 		if (OK_STAT(stat, good, bad)) {
 			*rstat = stat;
 			return 0;
 		}
 	}
 	*rstat = stat;
 	return -EFAULT;
 }

 /*
  * In case of error returns error value after doing "*startstop = ide_error()".
  * The caller should return the updated value of "startstop" in this case,
  * "startstop" is unchanged when the function returns 0.
  */
 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good,
 		  u8 bad, unsigned long timeout)
 {
 	int err;
 	u8 stat;

 	/* bail early if we've exceeded max_failures */
 	if (drive->max_failures && (drive->failures > drive->max_failures)) {
 		*startstop = ide_stopped;
 		return 1;
 	}

 	err = __ide_wait_stat(drive, good, bad, timeout, &stat);

 	if (err) {
 		char *s = (err == -EBUSY) ? "status timeout" : "status error";
 		*startstop = ide_error(drive, s, stat);
 	}

 	return err;
 }
 EXPORT_SYMBOL(ide_wait_stat);

 /**
  *	ide_in_drive_list	-	look for drive in black/white list
  *	@id: drive identifier
  *	@table: list to inspect
  *
  *	Look for a drive in the blacklist and the whitelist tables
  *	Returns 1 if the drive is found in the table.
  */

 int ide_in_drive_list(u16 *id, const struct drive_list_entry *table)
 {
 	for ( ; table->id_model; table++)
 		if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
 		    (!table->id_firmware ||
 		     strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
 			return 1;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(ide_in_drive_list);

 /*
  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
  * We list them here and depend on the device side cable detection for them.
  *
  * Some optical devices with the buggy firmwares have the same problem.
  */
 static const struct drive_list_entry ivb_list[] = {
 	{ "QUANTUM FIREBALLlct10 05"	, "A03.0900"	},
 	{ "TSSTcorp CDDVDW SH-S202J"	, "SB00"	},
 	{ "TSSTcorp CDDVDW SH-S202J"	, "SB01"	},
 	{ "TSSTcorp CDDVDW SH-S202N"	, "SB00"	},
 	{ "TSSTcorp CDDVDW SH-S202N"	, "SB01"	},
 	{ "TSSTcorp CDDVDW SH-S202H"	, "SB00"	},
 	{ "TSSTcorp CDDVDW SH-S202H"	, "SB01"	},
 	{ "SAMSUNG SP0822N"		, "WA100-10"	},
 	{ NULL				, NULL		}
 };

 /*
  *  All hosts that use the 80c ribbon must use!
  *  The name is derived from upper byte of word 93 and the 80c ribbon.
  */
 u8 eighty_ninty_three(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	u16 *id = drive->id;
 	int ivb = ide_in_drive_list(id, ivb_list);

 	if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 		return 1;

 	if (ivb)
 		printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 				  drive->name);

 	if (ata_id_is_sata(id) && !ivb)
 		return 1;

 	if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 		goto no_80w;

 	/*
 	 * FIXME:
 	 * - change master/slave IDENTIFY order
 	 * - force bit13 (80c cable present) check also for !ivb devices
 	 *   (unless the slave device is pre-ATA3)
 	 */
 	if ((id[ATA_ID_HW_CONFIG] & 0x4000) ||
 	    (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000)))
 		return 1;

 no_80w:
 	if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED)
 		return 0;

 	printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 			    "limiting max speed to UDMA33\n",
 			    drive->name,
 			    hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");

 	drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED;

 	return 0;
 }

 int ide_driveid_update(ide_drive_t *drive)
 {
 	u16 *id;
 	int rc;

 	id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
 	if (id == NULL)
 		return 0;

 	SELECT_MASK(drive, 1);
 	rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id);
 	SELECT_MASK(drive, 0);

 	if (rc)
 		goto out_err;

 	drive->id[ATA_ID_UDMA_MODES]  = id[ATA_ID_UDMA_MODES];
 	drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
 	drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
 	/* anything more ? */

 	kfree(id);

 	if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive))
 		ide_dma_off(drive);

 	return 1;
 out_err:
 	SELECT_MASK(drive, 0);
 	if (rc == 2)
 		printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__);
 	kfree(id);
 	return 0;
 }

 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 	u16 *id = drive->id, i;
 	int error = 0;
 	u8 stat;
 	struct ide_cmd cmd;

 #ifdef CONFIG_BLK_DEV_IDEDMA
 	if (hwif->dma_ops)	/* check if host supports DMA */
 		hwif->dma_ops->dma_host_set(drive, 0);
 #endif

 	/* Skip setting PIO flow-control modes on pre-EIDE drives */
 	if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0)
 		goto skip;

 	/*
 	 * Don't use ide_wait_cmd here - it will
 	 * attempt to set_geometry and recalibrate,
 	 * but for some reason these don't work at
 	 * this point (lost interrupt).
 	 */

 	/*
 	 *	FIXME: we race against the running IRQ here if
 	 *	this is called from non IRQ context. If we use
 	 *	disable_irq() we hang on the error path. Work
 	 *	is needed.
 	 */
 	disable_irq_nosync(hwif->irq);

 	udelay(1);
 	SELECT_DRIVE(drive);
 	SELECT_MASK(drive, 1);
 	udelay(1);
 	tp_ops->set_irq(hwif, 0);

 	memset(&cmd, 0, sizeof(cmd));
 	cmd.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT;
 	cmd.tf.feature = SETFEATURES_XFER;
 	cmd.tf.nsect   = speed;

 	tp_ops->tf_load(drive, &cmd);

 	tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);

 	if (drive->quirk_list == 2)
 		tp_ops->set_irq(hwif, 1);

 	error = __ide_wait_stat(drive, drive->ready_stat,
 				ATA_BUSY | ATA_DRQ | ATA_ERR,
 				WAIT_CMD, &stat);

 	SELECT_MASK(drive, 0);

 	enable_irq(hwif->irq);

 	if (error) {
 		(void) ide_dump_status(drive, "set_drive_speed_status", stat);
 		return error;
 	}

 	id[ATA_ID_UDMA_MODES]  &= ~0xFF00;
 	id[ATA_ID_MWDMA_MODES] &= ~0x0F00;
 	id[ATA_ID_SWDMA_MODES] &= ~0x0F00;

  skip:
 #ifdef CONFIG_BLK_DEV_IDEDMA
 	if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA))
 		hwif->dma_ops->dma_host_set(drive, 1);
 	else if (hwif->dma_ops)	/* check if host supports DMA */
 		ide_dma_off_quietly(drive);
 #endif

 	if (speed >= XFER_UDMA_0) {
 		i = 1 << (speed - XFER_UDMA_0);
 		id[ATA_ID_UDMA_MODES] |= (i << 8 | i);
 	} else if (speed >= XFER_MW_DMA_0) {
 		i = 1 << (speed - XFER_MW_DMA_0);
 		id[ATA_ID_MWDMA_MODES] |= (i << 8 | i);
 	} else if (speed >= XFER_SW_DMA_0) {
 		i = 1 << (speed - XFER_SW_DMA_0);
 		id[ATA_ID_SWDMA_MODES] |= (i << 8 | i);
 	}

 	if (!drive->init_speed)
 		drive->init_speed = speed;
 	drive->current_speed = speed;
 	return error;
 }

 /*
  * This should get invoked any time we exit the driver to
  * wait for an interrupt response from a drive.  handler() points
  * at the appropriate code to handle the next interrupt, and a
  * timer is started to prevent us from waiting forever in case
  * something goes wrong (see the ide_timer_expiry() handler later on).
  *
  * See also ide_execute_command
  */
 void __ide_set_handler(ide_drive_t *drive, ide_handler_t *handler,
 		       unsigned int timeout, ide_expiry_t *expiry)
 {
 	ide_hwif_t *hwif = drive->hwif;

 	BUG_ON(hwif->handler);
 	hwif->handler		= handler;
 	hwif->expiry		= expiry;
 	hwif->timer.expires	= jiffies + timeout;
 	hwif->req_gen_timer	= hwif->req_gen;
 	add_timer(&hwif->timer);
 }

 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 		      unsigned int timeout, ide_expiry_t *expiry)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	unsigned long flags;

 	spin_lock_irqsave(&hwif->lock, flags);
 	__ide_set_handler(drive, handler, timeout, expiry);
 	spin_unlock_irqrestore(&hwif->lock, flags);
 }
 EXPORT_SYMBOL(ide_set_handler);

 /**
  *	ide_execute_command	-	execute an IDE command
  *	@drive: IDE drive to issue the command against
  *	@command: command byte to write
  *	@handler: handler for next phase
  *	@timeout: timeout for command
  *	@expiry:  handler to run on timeout
  *
  *	Helper function to issue an IDE command. This handles the
  *	atomicity requirements, command timing and ensures that the
  *	handler and IRQ setup do not race. All IDE command kick off
  *	should go via this function or do equivalent locking.
  */

 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 			 unsigned timeout, ide_expiry_t *expiry)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	unsigned long flags;

 	spin_lock_irqsave(&hwif->lock, flags);
 	__ide_set_handler(drive, handler, timeout, expiry);
 	hwif->tp_ops->exec_command(hwif, cmd);
 	/*
 	 * Drive takes 400nS to respond, we must avoid the IRQ being
 	 * serviced before that.
 	 *
 	 * FIXME: we could skip this delay with care on non shared devices
 	 */
 	ndelay(400);
 	spin_unlock_irqrestore(&hwif->lock, flags);
 }
 EXPORT_SYMBOL(ide_execute_command);

 void ide_execute_pkt_cmd(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	unsigned long flags;

 	spin_lock_irqsave(&hwif->lock, flags);
 	hwif->tp_ops->exec_command(hwif, ATA_CMD_PACKET);
 	ndelay(400);
 	spin_unlock_irqrestore(&hwif->lock, flags);
 }
 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);

 /*
  * ide_wait_not_busy() waits for the currently selected device on the hwif
  * to report a non-busy status, see comments in ide_probe_port().
  */
 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
 {
 	u8 stat = 0;

 	while (timeout--) {
 		/*
 		 * Turn this into a schedule() sleep once I'm sure
 		 * about locking issues (2.5 work ?).
 		 */
 		mdelay(1);
 		stat = hwif->tp_ops->read_status(hwif);
 		if ((stat & ATA_BUSY) == 0)
 			return 0;
 		/*
 		 * Assume a value of 0xff means nothing is connected to
 		 * the interface and it doesn't implement the pull-down
 		 * resistor on D7.
 		 */
 		if (stat == 0xff)
 			return -ENODEV;
 		touch_softlockup_watchdog();
 		touch_nmi_watchdog();
 	}
 	return -EBUSY;
 }
	/*
	* Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
	* Copyright (C) 2003 Red Hat
	*
	*/

	#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/pci.h>
	#include <linux/delay.h>
	#include <linux/ide.h>
	#include <linux/bitops.h>
	#include <linux/nmi.h>

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

	void SELECT_DRIVE(ide_drive_t *drive)
	{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_port_ops *port_ops = hwif->port_ops;
	struct ide_cmd cmd;

	if (port_ops && port_ops->selectproc)
	port_ops->selectproc(drive);

	memset(&cmd, 0, sizeof(cmd));
	cmd.tf_flags = IDE_TFLAG_OUT_DEVICE;

	drive->hwif->tp_ops->tf_load(drive, &cmd);
	}

	void SELECT_MASK(ide_drive_t *drive, int mask)
	{
	const struct ide_port_ops *port_ops = drive->hwif->port_ops;

	if (port_ops && port_ops->maskproc)
	port_ops->maskproc(drive, mask);
	}

	u8 ide_read_error(ide_drive_t *drive)
	{
	struct ide_cmd cmd;

	memset(&cmd, 0, sizeof(cmd));
	cmd.tf_flags = IDE_TFLAG_IN_FEATURE;

	drive->hwif->tp_ops->tf_read(drive, &cmd);

	return cmd.tf.error;
	}
	EXPORT_SYMBOL_GPL(ide_read_error);

	void ide_fix_driveid(u16 *id)
	{
	#ifndef __LITTLE_ENDIAN
	# ifdef __BIG_ENDIAN
	int i;

	for (i = 0; i < 256; i++)
	id[i] = __le16_to_cpu(id[i]);
	# else
	# error "Please fix <asm/byteorder.h>"
	# endif
	#endif
	}

	/*
	* ide_fixstring() cleans up and (optionally) byte-swaps a text string,
	* removing leading/trailing blanks and compressing internal blanks.
	* It is primarily used to tidy up the model name/number fields as
	* returned by the ATA_CMD_ID_ATA[PI] commands.
	*/

	void ide_fixstring(u8 *s, const int bytecount, const int byteswap)
	{
	u8 p, end = &s[bytecount & ~1]; /* bytecount must be even */

	if (byteswap) {
	/* convert from big-endian to host byte order */
	for (p = s ; p != end ; p += 2)
	be16_to_cpus((u16 *) p);
	}

	/* strip leading blanks */
	p = s;
	while (s != end && *s == ' ')
	++s;
	/* compress internal blanks and strip trailing blanks */
	while (s != end && *s) {
	if (s++ != ' ' \|\| (s != end && s && *s != ' '))
	p++ = (s-1);
	}
	/* wipe out trailing garbage */
	while (p != end)
	*p++ = '\0';
	}
	EXPORT_SYMBOL(ide_fixstring);

	/*
	* This routine busy-waits for the drive status to be not "busy".
	* It then checks the status for all of the "good" bits and none
	* of the "bad" bits, and if all is okay it returns 0. All other
	* cases return error -- caller may then invoke ide_error().
	*
	* This routine should get fixed to not hog the cpu during extra long waits..
	* That could be done by busy-waiting for the first jiffy or two, and then
	* setting a timer to wake up at half second intervals thereafter,
	* until timeout is achieved, before timing out.
	*/
	static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
	unsigned long timeout, u8 *rstat)
	{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	unsigned long flags;
	int i;
	u8 stat;

	udelay(1); /* spec allows drive 400ns to assert "BUSY" */
	stat = tp_ops->read_status(hwif);

	if (stat & ATA_BUSY) {
	local_save_flags(flags);
	local_irq_enable_in_hardirq();
	timeout += jiffies;
	while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
	if (time_after(jiffies, timeout)) {
	/*
	* One last read after the timeout in case
	* heavy interrupt load made us not make any
	* progress during the timeout..
	*/
	stat = tp_ops->read_status(hwif);
	if ((stat & ATA_BUSY) == 0)
	break;

	local_irq_restore(flags);
	*rstat = stat;
	return -EBUSY;
	}
	}
	local_irq_restore(flags);
	}
	/*
	* Allow status to settle, then read it again.
	* A few rare drives vastly violate the 400ns spec here,
	* so we'll wait up to 10usec for a "good" status
	* rather than expensively fail things immediately.
	* This fix courtesy of Matthew Faupel & Niccolo Rigacci.
	*/
	for (i = 0; i < 10; i++) {
	udelay(1);
	stat = tp_ops->read_status(hwif);

	if (OK_STAT(stat, good, bad)) {
	*rstat = stat;
	return 0;
	}
	}
	*rstat = stat;
	return -EFAULT;
	}

	/*
	* In case of error returns error value after doing "*startstop = ide_error()".
	* The caller should return the updated value of "startstop" in this case,
	* "startstop" is unchanged when the function returns 0.
	*/
	int ide_wait_stat(ide_startstop_t startstop, ide_drive_t drive, u8 good,
	u8 bad, unsigned long timeout)
	{
	int err;
	u8 stat;

	/* bail early if we've exceeded max_failures */
	if (drive->max_failures && (drive->failures > drive->max_failures)) {
	*startstop = ide_stopped;
	return 1;
	}

	err = __ide_wait_stat(drive, good, bad, timeout, &stat);

	if (err) {
	char *s = (err == -EBUSY) ? "status timeout" : "status error";
	*startstop = ide_error(drive, s, stat);
	}

	return err;
	}
	EXPORT_SYMBOL(ide_wait_stat);

	/**
	* ide_in_drive_list - look for drive in black/white list
	* @id: drive identifier
	* @table: list to inspect
	*
	* Look for a drive in the blacklist and the whitelist tables
	* Returns 1 if the drive is found in the table.
	*/

	int ide_in_drive_list(u16 id, const struct drive_list_entry table)
	{
	for ( ; table->id_model; table++)
	if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
	(!table->id_firmware \|\|
	strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
	return 1;
	return 0;
	}
	EXPORT_SYMBOL_GPL(ide_in_drive_list);

	/*
	* Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
	* We list them here and depend on the device side cable detection for them.
	*
	* Some optical devices with the buggy firmwares have the same problem.
	*/
	static const struct drive_list_entry ivb_list[] = {
	{ "QUANTUM FIREBALLlct10 05" , "A03.0900" },
	{ "TSSTcorp CDDVDW SH-S202J" , "SB00" },
	{ "TSSTcorp CDDVDW SH-S202J" , "SB01" },
	{ "TSSTcorp CDDVDW SH-S202N" , "SB00" },
	{ "TSSTcorp CDDVDW SH-S202N" , "SB01" },
	{ "TSSTcorp CDDVDW SH-S202H" , "SB00" },
	{ "TSSTcorp CDDVDW SH-S202H" , "SB01" },
	{ "SAMSUNG SP0822N" , "WA100-10" },
	{ NULL , NULL }
	};

	/*
	* All hosts that use the 80c ribbon must use!
	* The name is derived from upper byte of word 93 and the 80c ribbon.
	*/
	u8 eighty_ninty_three(ide_drive_t *drive)
	{
	ide_hwif_t *hwif = drive->hwif;
	u16 *id = drive->id;
	int ivb = ide_in_drive_list(id, ivb_list);

	if (hwif->cbl == ATA_CBL_PATA40_SHORT)
	return 1;

	if (ivb)
	printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
	drive->name);

	if (ata_id_is_sata(id) && !ivb)
	return 1;

	if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
	goto no_80w;

	/*
	* FIXME:
	* - change master/slave IDENTIFY order
	* - force bit13 (80c cable present) check also for !ivb devices
	* (unless the slave device is pre-ATA3)
	*/
	if ((id[ATA_ID_HW_CONFIG] & 0x4000) \|\|
	(ivb && (id[ATA_ID_HW_CONFIG] & 0x2000)))
	return 1;

	no_80w:
	if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED)
	return 0;

	printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
	"limiting max speed to UDMA33\n",
	drive->name,
	hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");

	drive->dev_flags \|= IDE_DFLAG_UDMA33_WARNED;

	return 0;
	}

	int ide_driveid_update(ide_drive_t *drive)
	{
	u16 *id;
	int rc;

	id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
	if (id == NULL)
	return 0;

	SELECT_MASK(drive, 1);
	rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id);
	SELECT_MASK(drive, 0);

	if (rc)
	goto out_err;

	drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES];
	drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
	drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
	/* anything more ? */

	kfree(id);

	if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive))
	ide_dma_off(drive);

	return 1;
	out_err:
	SELECT_MASK(drive, 0);
	if (rc == 2)
	printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__);
	kfree(id);
	return 0;
	}

	int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
	{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	u16 *id = drive->id, i;
	int error = 0;
	u8 stat;
	struct ide_cmd cmd;

	#ifdef CONFIG_BLK_DEV_IDEDMA
	if (hwif->dma_ops) /* check if host supports DMA */
	hwif->dma_ops->dma_host_set(drive, 0);
	#endif

	/* Skip setting PIO flow-control modes on pre-EIDE drives */
	if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0)
	goto skip;

	/*
	* Don't use ide_wait_cmd here - it will
	* attempt to set_geometry and recalibrate,
	* but for some reason these don't work at
	* this point (lost interrupt).
	*/

	/*
	* FIXME: we race against the running IRQ here if
	* this is called from non IRQ context. If we use
	* disable_irq() we hang on the error path. Work
	* is needed.
	*/
	disable_irq_nosync(hwif->irq);

	udelay(1);
	SELECT_DRIVE(drive);
	SELECT_MASK(drive, 1);
	udelay(1);
	tp_ops->set_irq(hwif, 0);

	memset(&cmd, 0, sizeof(cmd));
	cmd.tf_flags = IDE_TFLAG_OUT_FEATURE \| IDE_TFLAG_OUT_NSECT;
	cmd.tf.feature = SETFEATURES_XFER;
	cmd.tf.nsect = speed;

	tp_ops->tf_load(drive, &cmd);

	tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);

	if (drive->quirk_list == 2)
	tp_ops->set_irq(hwif, 1);

	error = __ide_wait_stat(drive, drive->ready_stat,
	ATA_BUSY \| ATA_DRQ \| ATA_ERR,
	WAIT_CMD, &stat);

	SELECT_MASK(drive, 0);

	enable_irq(hwif->irq);

	if (error) {
	(void) ide_dump_status(drive, "set_drive_speed_status", stat);
	return error;
	}

	id[ATA_ID_UDMA_MODES] &= ~0xFF00;
	id[ATA_ID_MWDMA_MODES] &= ~0x0F00;
	id[ATA_ID_SWDMA_MODES] &= ~0x0F00;

	skip:
	#ifdef CONFIG_BLK_DEV_IDEDMA
	if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA))
	hwif->dma_ops->dma_host_set(drive, 1);
	else if (hwif->dma_ops) /* check if host supports DMA */
	ide_dma_off_quietly(drive);
	#endif

	if (speed >= XFER_UDMA_0) {
	i = 1 << (speed - XFER_UDMA_0);
	id[ATA_ID_UDMA_MODES] \|= (i << 8 \| i);
	} else if (speed >= XFER_MW_DMA_0) {
	i = 1 << (speed - XFER_MW_DMA_0);
	id[ATA_ID_MWDMA_MODES] \|= (i << 8 \| i);
	} else if (speed >= XFER_SW_DMA_0) {
	i = 1 << (speed - XFER_SW_DMA_0);
	id[ATA_ID_SWDMA_MODES] \|= (i << 8 \| i);
	}

	if (!drive->init_speed)
	drive->init_speed = speed;
	drive->current_speed = speed;
	return error;
	}

	/*
	* This should get invoked any time we exit the driver to
	* wait for an interrupt response from a drive. handler() points
	* at the appropriate code to handle the next interrupt, and a
	* timer is started to prevent us from waiting forever in case
	* something goes wrong (see the ide_timer_expiry() handler later on).
	*
	* See also ide_execute_command
	*/
	void __ide_set_handler(ide_drive_t drive, ide_handler_t handler,
	unsigned int timeout, ide_expiry_t *expiry)
	{
	ide_hwif_t *hwif = drive->hwif;

	BUG_ON(hwif->handler);
	hwif->handler = handler;
	hwif->expiry = expiry;
	hwif->timer.expires = jiffies + timeout;
	hwif->req_gen_timer = hwif->req_gen;
	add_timer(&hwif->timer);
	}

	void ide_set_handler (ide_drive_t drive, ide_handler_t handler,
	unsigned int timeout, ide_expiry_t *expiry)
	{
	ide_hwif_t *hwif = drive->hwif;
	unsigned long flags;

	spin_lock_irqsave(&hwif->lock, flags);
	__ide_set_handler(drive, handler, timeout, expiry);
	spin_unlock_irqrestore(&hwif->lock, flags);
	}
	EXPORT_SYMBOL(ide_set_handler);

	/**
	* ide_execute_command - execute an IDE command
	* @drive: IDE drive to issue the command against
	* @command: command byte to write
	* @handler: handler for next phase
	* @timeout: timeout for command
	* @expiry: handler to run on timeout
	*
	* Helper function to issue an IDE command. This handles the
	* atomicity requirements, command timing and ensures that the
	* handler and IRQ setup do not race. All IDE command kick off
	* should go via this function or do equivalent locking.
	*/

	void ide_execute_command(ide_drive_t drive, u8 cmd, ide_handler_t handler,
	unsigned timeout, ide_expiry_t *expiry)
	{
	ide_hwif_t *hwif = drive->hwif;
	unsigned long flags;

	spin_lock_irqsave(&hwif->lock, flags);
	__ide_set_handler(drive, handler, timeout, expiry);
	hwif->tp_ops->exec_command(hwif, cmd);
	/*
	* Drive takes 400nS to respond, we must avoid the IRQ being
	* serviced before that.
	*
	* FIXME: we could skip this delay with care on non shared devices
	*/
	ndelay(400);
	spin_unlock_irqrestore(&hwif->lock, flags);
	}
	EXPORT_SYMBOL(ide_execute_command);

	void ide_execute_pkt_cmd(ide_drive_t *drive)
	{
	ide_hwif_t *hwif = drive->hwif;
	unsigned long flags;

	spin_lock_irqsave(&hwif->lock, flags);
	hwif->tp_ops->exec_command(hwif, ATA_CMD_PACKET);
	ndelay(400);
	spin_unlock_irqrestore(&hwif->lock, flags);
	}
	EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);

	/*
	* ide_wait_not_busy() waits for the currently selected device on the hwif
	* to report a non-busy status, see comments in ide_probe_port().
	*/
	int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
	{
	u8 stat = 0;

	while (timeout--) {
	/*
	* Turn this into a schedule() sleep once I'm sure
	* about locking issues (2.5 work ?).
	*/
	mdelay(1);
	stat = hwif->tp_ops->read_status(hwif);
	if ((stat & ATA_BUSY) == 0)
	return 0;
	/*
	* Assume a value of 0xff means nothing is connected to
	* the interface and it doesn't implement the pull-down
	* resistor on D7.
	*/
	if (stat == 0xff)
	return -ENODEV;
	touch_softlockup_watchdog();
	touch_nmi_watchdog();
	}
	return -EBUSY;
	}