[deliverable/linux.git] / drivers / ide / ide-iops.c

/*
 *  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_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_taskfile tf;

	drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_ERROR);

	return 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];
	drive->id[ATA_ID_CFA_MODES]   = id[ATA_ID_CFA_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;
	struct ide_taskfile tf;
	u16 *id = drive->id, i;
	int error = 0;
	u8 stat;

#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);
	tp_ops->dev_select(drive);
	SELECT_MASK(drive, 1);
	udelay(1);
	tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);

	memset(&tf, 0, sizeof(tf));
	tf.feature = SETFEATURES_XFER;
	tf.nsect   = speed;

	tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE | IDE_VALID_NSECT);

	tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);

	if (drive->quirk_list == 2)
		tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);

	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;
	}

	if (speed >= XFER_SW_DMA_0) {
		id[ATA_ID_UDMA_MODES]  &= ~0xFF00;
		id[ATA_ID_MWDMA_MODES] &= ~0x0700;
		id[ATA_ID_SWDMA_MODES] &= ~0x0700;
		if (ata_id_is_cfa(id))
			id[ATA_ID_CFA_MODES] &= ~0x0E00;
	} else	if (ata_id_is_cfa(id))
		id[ATA_ID_CFA_MODES] &= ~0x01C0;

 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 (ata_id_is_cfa(id) && speed >= XFER_MW_DMA_3) {
		i = speed - XFER_MW_DMA_2;
		id[ATA_ID_CFA_MODES] |= i << 9;
	} 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);
	} else if (ata_id_is_cfa(id) && speed >= XFER_PIO_5) {
		i = speed - XFER_PIO_4;
		id[ATA_ID_CFA_MODES] |= i << 6;
	}

	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_hwif_t *hwif = drive->hwif;

	BUG_ON(hwif->handler);
	hwif->handler		= handler;
	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_hwif_t *hwif = drive->hwif;
	unsigned long flags;

	spin_lock_irqsave(&hwif->lock, flags);
	__ide_set_handler(drive, handler, timeout);
	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
 *	@cmd: command
 *	@handler: handler for next phase
 *	@timeout: timeout for command
 *
 *	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, struct ide_cmd *cmd,
			 ide_handler_t *handler, unsigned timeout)
{
	ide_hwif_t *hwif = drive->hwif;
	unsigned long flags;

	spin_lock_irqsave(&hwif->lock, flags);
	if ((cmd->protocol != ATAPI_PROT_DMA &&
	     cmd->protocol != ATAPI_PROT_PIO) ||
	    (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT))
		__ide_set_handler(drive, handler, timeout);
	hwif->tp_ops->exec_command(hwif, cmd->tf.command);
	/*
	 * 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);
}

/*
 * 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;
}
Commit	Line	Data
1da177e4	1	/*
1da177e4	2	* Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
ccd32e22	3	* Copyright (C) 2003 Red Hat
1da177e4 LT	4	*
	5	*/
	6
1da177e4 LT	7	#include <linux/module.h>
	8	#include <linux/types.h>
	9	#include <linux/string.h>
	10	#include <linux/kernel.h>
	11	#include <linux/timer.h>
	12	#include <linux/mm.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/major.h>
	15	#include <linux/errno.h>
	16	#include <linux/genhd.h>
	17	#include <linux/blkpg.h>
	18	#include <linux/slab.h>
	19	#include <linux/pci.h>
	20	#include <linux/delay.h>
1da177e4 LT	21	#include <linux/ide.h>
1da177e4 LT	22	#include <linux/bitops.h>
1e86240f	23	#include <linux/nmi.h>
1da177e4 LT	24
	25	#include <asm/byteorder.h>
	26	#include <asm/irq.h>
	27	#include <asm/uaccess.h>
	28	#include <asm/io.h>
	29
ed4af48f	30	void SELECT_MASK(ide_drive_t *drive, int mask)
1da177e4	31	{
ac95beed BZ	32	const struct ide_port_ops *port_ops = drive->hwif->port_ops;
	33
	34	if (port_ops && port_ops->maskproc)
	35	port_ops->maskproc(drive, mask);
1da177e4 LT	36	}
1da177e4 LT	37
92eb4380 BZ	38	u8 ide_read_error(ide_drive_t *drive)
92eb4380 BZ	39	{
3153c26b	40	struct ide_taskfile tf;
92eb4380	41
3153c26b	42	drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_ERROR);
92eb4380	43
3153c26b	44	return tf.error;
92eb4380 BZ	45	}
	46	EXPORT_SYMBOL_GPL(ide_read_error);
	47
4dde4492	48	void ide_fix_driveid(u16 *id)
1da177e4 LT	49	{
	50	#ifndef __LITTLE_ENDIAN
	51	# ifdef __BIG_ENDIAN
	52	int i;
5b90e990	53
48fb2688	54	for (i = 0; i < 256; i++)
5b90e990	55	id[i] = __le16_to_cpu(id[i]);
1da177e4 LT	56	# else
	57	# error "Please fix <asm/byteorder.h>"
	58	# endif
	59	#endif
	60	}
	61
01745112 BZ	62	/*
	63	* ide_fixstring() cleans up and (optionally) byte-swaps a text string,
	64	* removing leading/trailing blanks and compressing internal blanks.
	65	* It is primarily used to tidy up the model name/number fields as
aaaade3f	66	* returned by the ATA_CMD_ID_ATA[PI] commands.
01745112 BZ	67	*/
01745112 BZ	68
122f06f8	69	void ide_fixstring(u8 *s, const int bytecount, const int byteswap)
1da177e4	70	{
1a7809e3	71	u8 p, end = &s[bytecount & ~1]; /* bytecount must be even */
1da177e4 LT	72
	73	if (byteswap) {
	74	/* convert from big-endian to host byte order */
1a7809e3 LT	75	for (p = s ; p != end ; p += 2)
1a7809e3 LT	76	be16_to_cpus((u16 *) p);
1da177e4	77	}
1a7809e3	78
1da177e4	79	/* strip leading blanks */
1a7809e3	80	p = s;
1da177e4 LT	81	while (s != end && *s == ' ')
	82	++s;
	83	/* compress internal blanks and strip trailing blanks */
	84	while (s != end && *s) {
	85	if (s++ != ' ' \|\| (s != end && s && *s != ' '))
	86	p++ = (s-1);
	87	}
	88	/* wipe out trailing garbage */
	89	while (p != end)
	90	*p++ = '\0';
	91	}
1da177e4 LT	92	EXPORT_SYMBOL(ide_fixstring);
1da177e4 LT	93
1da177e4 LT	94	/*
	95	* This routine busy-waits for the drive status to be not "busy".
	96	* It then checks the status for all of the "good" bits and none
	97	* of the "bad" bits, and if all is okay it returns 0. All other
74af21cf	98	* cases return error -- caller may then invoke ide_error().
1da177e4 LT	99	*
	100	* This routine should get fixed to not hog the cpu during extra long waits..
	101	* That could be done by busy-waiting for the first jiffy or two, and then
	102	* setting a timer to wake up at half second intervals thereafter,
	103	* until timeout is achieved, before timing out.
	104	*/
122f06f8 BZ	105	static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
122f06f8 BZ	106	unsigned long timeout, u8 *rstat)
1da177e4	107	{
b73c7ee2	108	ide_hwif_t *hwif = drive->hwif;
374e042c	109	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
1da177e4	110	unsigned long flags;
74af21cf BZ	111	int i;
74af21cf BZ	112	u8 stat;
1da177e4 LT	113
1da177e4 LT	114	udelay(1); /* spec allows drive 400ns to assert "BUSY" */
374e042c	115	stat = tp_ops->read_status(hwif);
c47137a9	116
3a7d2484	117	if (stat & ATA_BUSY) {
9b896033	118	local_save_flags(flags);
54cc1428	119	local_irq_enable_in_hardirq();
1da177e4	120	timeout += jiffies;
3a7d2484	121	while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
1da177e4 LT	122	if (time_after(jiffies, timeout)) {
	123	/*
	124	* One last read after the timeout in case
	125	* heavy interrupt load made us not make any
	126	* progress during the timeout..
	127	*/
374e042c	128	stat = tp_ops->read_status(hwif);
3a7d2484	129	if ((stat & ATA_BUSY) == 0)
1da177e4 LT	130	break;
	131
	132	local_irq_restore(flags);
74af21cf BZ	133	*rstat = stat;
74af21cf BZ	134	return -EBUSY;
1da177e4 LT	135	}
	136	}
	137	local_irq_restore(flags);
	138	}
	139	/*
	140	* Allow status to settle, then read it again.
	141	* A few rare drives vastly violate the 400ns spec here,
	142	* so we'll wait up to 10usec for a "good" status
	143	* rather than expensively fail things immediately.
	144	* This fix courtesy of Matthew Faupel & Niccolo Rigacci.
	145	*/
	146	for (i = 0; i < 10; i++) {
	147	udelay(1);
374e042c	148	stat = tp_ops->read_status(hwif);
c47137a9 BZ	149
c47137a9 BZ	150	if (OK_STAT(stat, good, bad)) {
74af21cf	151	*rstat = stat;
1da177e4	152	return 0;
74af21cf	153	}
1da177e4	154	}
74af21cf BZ	155	*rstat = stat;
	156	return -EFAULT;
	157	}
	158
	159	/*
	160	* In case of error returns error value after doing "*startstop = ide_error()".
	161	* The caller should return the updated value of "startstop" in this case,
	162	* "startstop" is unchanged when the function returns 0.
	163	*/
122f06f8 BZ	164	int ide_wait_stat(ide_startstop_t startstop, ide_drive_t drive, u8 good,
122f06f8 BZ	165	u8 bad, unsigned long timeout)
74af21cf BZ	166	{
	167	int err;
	168	u8 stat;
	169
	170	/* bail early if we've exceeded max_failures */
	171	if (drive->max_failures && (drive->failures > drive->max_failures)) {
	172	*startstop = ide_stopped;
	173	return 1;
	174	}
	175
	176	err = __ide_wait_stat(drive, good, bad, timeout, &stat);
	177
	178	if (err) {
	179	char *s = (err == -EBUSY) ? "status timeout" : "status error";
	180	*startstop = ide_error(drive, s, stat);
	181	}
	182
	183	return err;
1da177e4	184	}
1da177e4 LT	185	EXPORT_SYMBOL(ide_wait_stat);
1da177e4 LT	186
a5b7e70d BZ	187	/**
	188	* ide_in_drive_list - look for drive in black/white list
	189	* @id: drive identifier
4dde4492	190	* @table: list to inspect
a5b7e70d BZ	191	*
	192	* Look for a drive in the blacklist and the whitelist tables
	193	* Returns 1 if the drive is found in the table.
	194	*/
	195
4dde4492	196	int ide_in_drive_list(u16 id, const struct drive_list_entry table)
a5b7e70d	197	{
4dde4492 BZ	198	for ( ; table->id_model; table++)
	199	if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
	200	(!table->id_firmware \|\|
	201	strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
a5b7e70d BZ	202	return 1;
	203	return 0;
	204	}
b0244a00 BZ	205	EXPORT_SYMBOL_GPL(ide_in_drive_list);
b0244a00 BZ	206
a5b7e70d BZ	207	/*
	208	* Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
	209	* We list them here and depend on the device side cable detection for them.
8588a2b7 BZ	210	*
8588a2b7 BZ	211	* Some optical devices with the buggy firmwares have the same problem.
a5b7e70d BZ	212	*/
	213	static const struct drive_list_entry ivb_list[] = {
	214	{ "QUANTUM FIREBALLlct10 05" , "A03.0900" },
8588a2b7	215	{ "TSSTcorp CDDVDW SH-S202J" , "SB00" },
e97564f3 PM	216	{ "TSSTcorp CDDVDW SH-S202J" , "SB01" },
	217	{ "TSSTcorp CDDVDW SH-S202N" , "SB00" },
	218	{ "TSSTcorp CDDVDW SH-S202N" , "SB01" },
3ced5c49 AS	219	{ "TSSTcorp CDDVDW SH-S202H" , "SB00" },
3ced5c49 AS	220	{ "TSSTcorp CDDVDW SH-S202H" , "SB01" },
c7b997b3	221	{ "SAMSUNG SP0822N" , "WA100-10" },
a5b7e70d BZ	222	{ NULL , NULL }
	223	};
	224
1da177e4 LT	225	/*
	226	* All hosts that use the 80c ribbon must use!
	227	* The name is derived from upper byte of word 93 and the 80c ribbon.
	228	*/
122f06f8	229	u8 eighty_ninty_three(ide_drive_t *drive)
1da177e4	230	{
7f8f48af	231	ide_hwif_t *hwif = drive->hwif;
4dde4492	232	u16 *id = drive->id;
a5b7e70d	233	int ivb = ide_in_drive_list(id, ivb_list);
7f8f48af	234
49521f97 BZ	235	if (hwif->cbl == ATA_CBL_PATA40_SHORT)
	236	return 1;
	237
a5b7e70d BZ	238	if (ivb)
	239	printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
	240	drive->name);
	241
367d7e78	242	if (ata_id_is_sata(id) && !ivb)
b98f8803 GK	243	return 1;
b98f8803 GK	244
a5b7e70d	245	if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
7f8f48af	246	goto no_80w;
1a1276e7	247
f68d9320 BZ	248	/*
f68d9320 BZ	249	* FIXME:
f367bed0	250	* - change master/slave IDENTIFY order
a5b7e70d	251	* - force bit13 (80c cable present) check also for !ivb devices
f68d9320 BZ	252	* (unless the slave device is pre-ATA3)
f68d9320 BZ	253	*/
4dde4492 BZ	254	if ((id[ATA_ID_HW_CONFIG] & 0x4000) \|\|
4dde4492 BZ	255	(ivb && (id[ATA_ID_HW_CONFIG] & 0x2000)))
7f8f48af BZ	256	return 1;
	257
	258	no_80w:
97100fc8	259	if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED)
7f8f48af BZ	260	return 0;
	261
	262	printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
	263	"limiting max speed to UDMA33\n",
49521f97 BZ	264	drive->name,
49521f97 BZ	265	hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
7f8f48af	266
97100fc8	267	drive->dev_flags \|= IDE_DFLAG_UDMA33_WARNED;
7f8f48af BZ	268
7f8f48af BZ	269	return 0;
1da177e4 LT	270	}
1da177e4 LT	271
8a455134	272	int ide_driveid_update(ide_drive_t *drive)
1da177e4	273	{
4dde4492	274	u16 *id;
2ebe1d9e	275	int rc;
2f40c9b0 BZ	276
	277	id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
	278	if (id == NULL)
	279	return 0;
1da177e4	280
1da177e4	281	SELECT_MASK(drive, 1);
2ebe1d9e BZ	282	rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id);
2ebe1d9e BZ	283	SELECT_MASK(drive, 0);
2f40c9b0	284
2ebe1d9e	285	if (rc)
2f40c9b0	286	goto out_err;
f323b80d	287
4dde4492 BZ	288	drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES];
	289	drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
	290	drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
74638c84	291	drive->id[ATA_ID_CFA_MODES] = id[ATA_ID_CFA_MODES];
4dde4492 BZ	292	/* anything more ? */
	293
	294	kfree(id);
	295
97100fc8	296	if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive))
4dde4492	297	ide_dma_off(drive);
1da177e4 LT	298
1da177e4 LT	299	return 1;
2f40c9b0 BZ	300	out_err:
	301	SELECT_MASK(drive, 0);
	302	if (rc == 2)
	303	printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__);
	304	kfree(id);
	305	return 0;
1da177e4 LT	306	}
1da177e4 LT	307
74af21cf	308	int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
1da177e4	309	{
74af21cf	310	ide_hwif_t *hwif = drive->hwif;
374e042c	311	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
c9ff9e7b	312	struct ide_taskfile tf;
4dde4492	313	u16 *id = drive->id, i;
89613e66	314	int error = 0;
1da177e4 LT	315	u8 stat;
1da177e4 LT	316
1da177e4	317	#ifdef CONFIG_BLK_DEV_IDEDMA
5e37bdc0 BZ	318	if (hwif->dma_ops) /* check if host supports DMA */
5e37bdc0 BZ	319	hwif->dma_ops->dma_host_set(drive, 0);
1da177e4 LT	320	#endif
1da177e4 LT	321
89613e66	322	/* Skip setting PIO flow-control modes on pre-EIDE drives */
48fb2688	323	if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0)
89613e66 SS	324	goto skip;
89613e66 SS	325
1da177e4 LT	326	/*
	327	* Don't use ide_wait_cmd here - it will
	328	* attempt to set_geometry and recalibrate,
	329	* but for some reason these don't work at
	330	* this point (lost interrupt).
	331	*/
ee1b1cc9	332
1da177e4 LT	333	/*
	334	* FIXME: we race against the running IRQ here if
	335	* this is called from non IRQ context. If we use
	336	* disable_irq() we hang on the error path. Work
	337	* is needed.
	338	*/
ee1b1cc9 BZ	339	disable_irq_nosync(hwif->irq);
ee1b1cc9 BZ	340
1da177e4	341	udelay(1);
fdd88f0a	342	tp_ops->dev_select(drive);
e5403bff	343	SELECT_MASK(drive, 1);
1da177e4	344	udelay(1);
ecf3a31d	345	tp_ops->write_devctl(hwif, ATA_NIEN \| ATA_DEVCTL_OBS);
59be2c80	346
c9ff9e7b SS	347	memset(&tf, 0, sizeof(tf));
	348	tf.feature = SETFEATURES_XFER;
	349	tf.nsect = speed;
59be2c80	350
c9ff9e7b	351	tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE \| IDE_VALID_NSECT);
59be2c80	352
aaaade3f	353	tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);
59be2c80	354
81ca6919	355	if (drive->quirk_list == 2)
ecf3a31d	356	tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
1da177e4	357
74af21cf	358	error = __ide_wait_stat(drive, drive->ready_stat,
3a7d2484	359	ATA_BUSY \| ATA_DRQ \| ATA_ERR,
74af21cf	360	WAIT_CMD, &stat);
1da177e4 LT	361
	362	SELECT_MASK(drive, 0);
	363
	364	enable_irq(hwif->irq);
	365
	366	if (error) {
	367	(void) ide_dump_status(drive, "set_drive_speed_status", stat);
	368	return error;
	369	}
	370
c4199930 SS	371	if (speed >= XFER_SW_DMA_0) {
	372	id[ATA_ID_UDMA_MODES] &= ~0xFF00;
	373	id[ATA_ID_MWDMA_MODES] &= ~0x0700;
	374	id[ATA_ID_SWDMA_MODES] &= ~0x0700;
74638c84 SS	375	if (ata_id_is_cfa(id))
	376	id[ATA_ID_CFA_MODES] &= ~0x0E00;
	377	} else if (ata_id_is_cfa(id))
	378	id[ATA_ID_CFA_MODES] &= ~0x01C0;
1da177e4	379
89613e66	380	skip:
1da177e4	381	#ifdef CONFIG_BLK_DEV_IDEDMA
97100fc8	382	if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA))
5e37bdc0 BZ	383	hwif->dma_ops->dma_host_set(drive, 1);
5e37bdc0 BZ	384	else if (hwif->dma_ops) /* check if host supports DMA */
4a546e04	385	ide_dma_off_quietly(drive);
1da177e4 LT	386	#endif
1da177e4 LT	387
4dde4492 BZ	388	if (speed >= XFER_UDMA_0) {
	389	i = 1 << (speed - XFER_UDMA_0);
	390	id[ATA_ID_UDMA_MODES] \|= (i << 8 \| i);
74638c84 SS	391	} else if (ata_id_is_cfa(id) && speed >= XFER_MW_DMA_3) {
	392	i = speed - XFER_MW_DMA_2;
	393	id[ATA_ID_CFA_MODES] \|= i << 9;
4dde4492 BZ	394	} else if (speed >= XFER_MW_DMA_0) {
	395	i = 1 << (speed - XFER_MW_DMA_0);
	396	id[ATA_ID_MWDMA_MODES] \|= (i << 8 \| i);
	397	} else if (speed >= XFER_SW_DMA_0) {
	398	i = 1 << (speed - XFER_SW_DMA_0);
	399	id[ATA_ID_SWDMA_MODES] \|= (i << 8 \| i);
74638c84 SS	400	} else if (ata_id_is_cfa(id) && speed >= XFER_PIO_5) {
	401	i = speed - XFER_PIO_4;
	402	id[ATA_ID_CFA_MODES] \|= i << 6;
1da177e4	403	}
4dde4492	404
1da177e4 LT	405	if (!drive->init_speed)
	406	drive->init_speed = speed;
	407	drive->current_speed = speed;
	408	return error;
	409	}
	410
1da177e4 LT	411	/*
	412	* This should get invoked any time we exit the driver to
	413	* wait for an interrupt response from a drive. handler() points
	414	* at the appropriate code to handle the next interrupt, and a
	415	* timer is started to prevent us from waiting forever in case
	416	* something goes wrong (see the ide_timer_expiry() handler later on).
	417	*
	418	* See also ide_execute_command
	419	*/
327fa1c2	420	void __ide_set_handler(ide_drive_t drive, ide_handler_t handler,
60c0cd02	421	unsigned int timeout)
1da177e4	422	{
b65fac32 BZ	423	ide_hwif_t *hwif = drive->hwif;
	424
	425	BUG_ON(hwif->handler);
	426	hwif->handler = handler;
b65fac32 BZ	427	hwif->timer.expires = jiffies + timeout;
	428	hwif->req_gen_timer = hwif->req_gen;
	429	add_timer(&hwif->timer);
1da177e4 LT	430	}
1da177e4 LT	431
60c0cd02 BZ	432	void ide_set_handler(ide_drive_t drive, ide_handler_t handler,
60c0cd02 BZ	433	unsigned int timeout)
1da177e4	434	{
b65fac32	435	ide_hwif_t *hwif = drive->hwif;
1da177e4	436	unsigned long flags;
2a2ca6a9	437
b65fac32	438	spin_lock_irqsave(&hwif->lock, flags);
60c0cd02	439	__ide_set_handler(drive, handler, timeout);
b65fac32	440	spin_unlock_irqrestore(&hwif->lock, flags);
1da177e4	441	}
1da177e4	442	EXPORT_SYMBOL(ide_set_handler);
122f06f8	443
1da177e4 LT	444	/**
	445	* ide_execute_command - execute an IDE command
	446	* @drive: IDE drive to issue the command against
35b5d0be	447	* @cmd: command
1da177e4 LT	448	* @handler: handler for next phase
1da177e4 LT	449	* @timeout: timeout for command
1da177e4 LT	450	*
1da177e4 LT	451	* Helper function to issue an IDE command. This handles the
122f06f8	452	* atomicity requirements, command timing and ensures that the
1da177e4 LT	453	* handler and IRQ setup do not race. All IDE command kick off
	454	* should go via this function or do equivalent locking.
	455	*/
cd2a2d96	456
35b5d0be BZ	457	void ide_execute_command(ide_drive_t drive, struct ide_cmd cmd,
35b5d0be BZ	458	ide_handler_t *handler, unsigned timeout)
1da177e4	459	{
2a2ca6a9	460	ide_hwif_t *hwif = drive->hwif;
1da177e4	461	unsigned long flags;
629f944b	462
b65fac32	463	spin_lock_irqsave(&hwif->lock, flags);
35b5d0be BZ	464	if ((cmd->protocol != ATAPI_PROT_DMA &&
	465	cmd->protocol != ATAPI_PROT_PIO) \|\|
	466	(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT))
	467	__ide_set_handler(drive, handler, timeout);
	468	hwif->tp_ops->exec_command(hwif, cmd->tf.command);
629f944b BZ	469	/*
	470	* Drive takes 400nS to respond, we must avoid the IRQ being
	471	* serviced before that.
	472	*
	473	* FIXME: we could skip this delay with care on non shared devices
	474	*/
1da177e4	475	ndelay(400);
b65fac32	476	spin_unlock_irqrestore(&hwif->lock, flags);
1da177e4	477	}
1da177e4	478
1da177e4 LT	479	/*
1da177e4 LT	480	* ide_wait_not_busy() waits for the currently selected device on the hwif
9d501529	481	* to report a non-busy status, see comments in ide_probe_port().
1da177e4 LT	482	*/
	483	int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
	484	{
	485	u8 stat = 0;
	486
122f06f8	487	while (timeout--) {
1da177e4 LT	488	/*
	489	* Turn this into a schedule() sleep once I'm sure
	490	* about locking issues (2.5 work ?).
	491	*/
	492	mdelay(1);
374e042c	493	stat = hwif->tp_ops->read_status(hwif);
3a7d2484	494	if ((stat & ATA_BUSY) == 0)
1da177e4 LT	495	return 0;
	496	/*
	497	* Assume a value of 0xff means nothing is connected to
	498	* the interface and it doesn't implement the pull-down
	499	* resistor on D7.
	500	*/
	501	if (stat == 0xff)
	502	return -ENODEV;
6842f8c8	503	touch_softlockup_watchdog();
1e86240f	504	touch_nmi_watchdog();
1da177e4 LT	505	}
	506	return -EBUSY;
	507	}