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

#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/hdreg.h>
#include <linux/ide.h>
#include <linux/bitops.h>

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

/*
 *	IDE library routines. These are plug in code that most 
 *	drivers can use but occasionally may be weird enough
 *	to want to do their own thing with
 *
 *	Add common non I/O op stuff here. Make sure it has proper
 *	kernel-doc function headers or your patch will be rejected
 */
 

/**
 *	ide_xfer_verbose	-	return IDE mode names
 *	@xfer_rate: rate to name
 *
 *	Returns a constant string giving the name of the mode
 *	requested.
 */

char *ide_xfer_verbose (u8 xfer_rate)
{
        switch(xfer_rate) {
                case XFER_UDMA_7:	return("UDMA 7");
                case XFER_UDMA_6:	return("UDMA 6");
                case XFER_UDMA_5:	return("UDMA 5");
                case XFER_UDMA_4:	return("UDMA 4");
                case XFER_UDMA_3:	return("UDMA 3");
                case XFER_UDMA_2:	return("UDMA 2");
                case XFER_UDMA_1:	return("UDMA 1");
                case XFER_UDMA_0:	return("UDMA 0");
                case XFER_MW_DMA_2:	return("MW DMA 2");
                case XFER_MW_DMA_1:	return("MW DMA 1");
                case XFER_MW_DMA_0:	return("MW DMA 0");
                case XFER_SW_DMA_2:	return("SW DMA 2");
                case XFER_SW_DMA_1:	return("SW DMA 1");
                case XFER_SW_DMA_0:	return("SW DMA 0");
                case XFER_PIO_4:	return("PIO 4");
                case XFER_PIO_3:	return("PIO 3");
                case XFER_PIO_2:	return("PIO 2");
                case XFER_PIO_1:	return("PIO 1");
                case XFER_PIO_0:	return("PIO 0");
                case XFER_PIO_SLOW:	return("PIO SLOW");
                default:		return("XFER ERROR");
        }
}

EXPORT_SYMBOL(ide_xfer_verbose);

/**
 *	ide_rate_filter		-	filter transfer mode
 *	@drive: IDE device
 *	@speed: desired speed
 *
 *	Given the available transfer modes this function returns
 *	the best available speed at or below the speed requested.
 *
 *	FIXME: filter also PIO/SWDMA/MWDMA modes
 */

u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
{
#ifdef CONFIG_BLK_DEV_IDEDMA
	ide_hwif_t *hwif = drive->hwif;
	u8 mask = hwif->ultra_mask, mode = XFER_MW_DMA_2;

	if (hwif->udma_filter)
		mask = hwif->udma_filter(drive);

	/*
	 * TODO: speed > XFER_UDMA_2 extra check is needed to avoid false
	 * cable warning from eighty_ninty_three(), moving ide_rate_filter()
	 * calls from ->speedproc to core code will make this hack go away
	 */
	if (speed > XFER_UDMA_2) {
		if ((mask & 0x78) && (eighty_ninty_three(drive) == 0))
			mask &= 0x07;
	}

	if (mask)
		mode = fls(mask) - 1 + XFER_UDMA_0;

//	printk("%s: mode 0x%02x, speed 0x%02x\n", __FUNCTION__, mode, speed);

	return min(speed, mode);
#else /* !CONFIG_BLK_DEV_IDEDMA */
	return min(speed, (u8)XFER_PIO_4);
#endif /* CONFIG_BLK_DEV_IDEDMA */
}

EXPORT_SYMBOL(ide_rate_filter);

int ide_use_fast_pio(ide_drive_t *drive)
{
	struct hd_driveid *id = drive->id;

	if ((id->capability & 1) && drive->autodma)
		return 1;

	if ((id->capability & 8) || (id->field_valid & 2))
		return 1;

	return 0;
}

EXPORT_SYMBOL_GPL(ide_use_fast_pio);

/*
 * Standard (generic) timings for PIO modes, from ATA2 specification.
 * These timings are for access to the IDE data port register *only*.
 * Some drives may specify a mode, while also specifying a different
 * value for cycle_time (from drive identification data).
 */
const ide_pio_timings_t ide_pio_timings[6] = {
	{ 70,	165,	600 },	/* PIO Mode 0 */
	{ 50,	125,	383 },	/* PIO Mode 1 */
	{ 30,	100,	240 },	/* PIO Mode 2 */
	{ 30,	80,	180 },	/* PIO Mode 3 with IORDY */
	{ 25,	70,	120 },	/* PIO Mode 4 with IORDY */
	{ 20,	50,	100 }	/* PIO Mode 5 with IORDY (nonstandard) */
};

EXPORT_SYMBOL_GPL(ide_pio_timings);

/*
 * Shared data/functions for determining best PIO mode for an IDE drive.
 * Most of this stuff originally lived in cmd640.c, and changes to the
 * ide_pio_blacklist[] table should be made with EXTREME CAUTION to avoid
 * breaking the fragile cmd640.c support.
 */

/*
 * Black list. Some drives incorrectly report their maximal PIO mode,
 * at least in respect to CMD640. Here we keep info on some known drives.
 */
static struct ide_pio_info {
	const char	*name;
	int		pio;
} ide_pio_blacklist [] = {
/*	{ "Conner Peripherals 1275MB - CFS1275A", 4 }, */
	{ "Conner Peripherals 540MB - CFS540A", 3 },

	{ "WDC AC2700",  3 },
	{ "WDC AC2540",  3 },
	{ "WDC AC2420",  3 },
	{ "WDC AC2340",  3 },
	{ "WDC AC2250",  0 },
	{ "WDC AC2200",  0 },
	{ "WDC AC21200", 4 },
	{ "WDC AC2120",  0 },
	{ "WDC AC2850",  3 },
	{ "WDC AC1270",  3 },
	{ "WDC AC1170",  1 },
	{ "WDC AC1210",  1 },
	{ "WDC AC280",   0 },
/*	{ "WDC AC21000", 4 }, */
	{ "WDC AC31000", 3 },
	{ "WDC AC31200", 3 },
/*	{ "WDC AC31600", 4 }, */

	{ "Maxtor 7131 AT", 1 },
	{ "Maxtor 7171 AT", 1 },
	{ "Maxtor 7213 AT", 1 },
	{ "Maxtor 7245 AT", 1 },
	{ "Maxtor 7345 AT", 1 },
	{ "Maxtor 7546 AT", 3 },
	{ "Maxtor 7540 AV", 3 },

	{ "SAMSUNG SHD-3121A", 1 },
	{ "SAMSUNG SHD-3122A", 1 },
	{ "SAMSUNG SHD-3172A", 1 },

/*	{ "ST51080A", 4 },
 *	{ "ST51270A", 4 },
 *	{ "ST31220A", 4 },
 *	{ "ST31640A", 4 },
 *	{ "ST32140A", 4 },
 *	{ "ST3780A",  4 },
 */
	{ "ST5660A",  3 },
	{ "ST3660A",  3 },
	{ "ST3630A",  3 },
	{ "ST3655A",  3 },
	{ "ST3391A",  3 },
	{ "ST3390A",  1 },
	{ "ST3600A",  1 },
	{ "ST3290A",  0 },
	{ "ST3144A",  0 },
	{ "ST3491A",  1 },	/* reports 3, should be 1 or 2 (depending on */	
				/* drive) according to Seagates FIND-ATA program */

	{ "QUANTUM ELS127A", 0 },
	{ "QUANTUM ELS170A", 0 },
	{ "QUANTUM LPS240A", 0 },
	{ "QUANTUM LPS210A", 3 },
	{ "QUANTUM LPS270A", 3 },
	{ "QUANTUM LPS365A", 3 },
	{ "QUANTUM LPS540A", 3 },
	{ "QUANTUM LIGHTNING 540A", 3 },
	{ "QUANTUM LIGHTNING 730A", 3 },

        { "QUANTUM FIREBALL_540", 3 }, /* Older Quantum Fireballs don't work */
        { "QUANTUM FIREBALL_640", 3 }, 
        { "QUANTUM FIREBALL_1080", 3 },
        { "QUANTUM FIREBALL_1280", 3 },
	{ NULL,	0 }
};

/**
 *	ide_scan_pio_blacklist 	-	check for a blacklisted drive
 *	@model: Drive model string
 *
 *	This routine searches the ide_pio_blacklist for an entry
 *	matching the start/whole of the supplied model name.
 *
 *	Returns -1 if no match found.
 *	Otherwise returns the recommended PIO mode from ide_pio_blacklist[].
 */

static int ide_scan_pio_blacklist (char *model)
{
	struct ide_pio_info *p;

	for (p = ide_pio_blacklist; p->name != NULL; p++) {
		if (strncmp(p->name, model, strlen(p->name)) == 0)
			return p->pio;
	}
	return -1;
}

/**
 *	ide_get_best_pio_mode	-	get PIO mode from drive
 *	@drive: drive to consider
 *	@mode_wanted: preferred mode
 *	@max_mode: highest allowed mode
 *	@d: PIO data
 *
 *	This routine returns the recommended PIO settings for a given drive,
 *	based on the drive->id information and the ide_pio_blacklist[].
 *
 *	Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
 *	This is used by most chipset support modules when "auto-tuning".
 */

u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode, ide_pio_data_t *d)
{
	int pio_mode;
	int cycle_time = 0;
	struct hd_driveid* id = drive->id;
	int overridden  = 0;

	if (mode_wanted != 255) {
		pio_mode = mode_wanted;
	} else if (!drive->id) {
		pio_mode = 0;
	} else if ((pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
		printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
	} else {
		pio_mode = id->tPIO;
		if (pio_mode > 2) {	/* 2 is maximum allowed tPIO value */
			pio_mode = 2;
			overridden = 1;
		}
		if (id->field_valid & 2) {	  /* drive implements ATA2? */
			if (id->capability & 8) { /* IORDY supported? */
				cycle_time = id->eide_pio_iordy;
				if (id->eide_pio_modes & 7) {
					overridden = 0;
					if (id->eide_pio_modes & 4)
						pio_mode = 5;
					else if (id->eide_pio_modes & 2)
						pio_mode = 4;
					else
						pio_mode = 3;
				}
			} else {
				cycle_time = id->eide_pio;
			}
		}

		if (overridden)
			printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
					 drive->name);

		/*
		 * Conservative "downgrade" for all pre-ATA2 drives
		 */
		if (pio_mode && pio_mode < 4) {
			pio_mode--;
			printk(KERN_INFO "%s: applying conservative "
					 "PIO \"downgrade\"\n", drive->name);
			if (cycle_time && cycle_time < ide_pio_timings[pio_mode].cycle_time)
				cycle_time = 0; /* use standard timing */
		}
	}
	if (pio_mode > max_mode) {
		pio_mode = max_mode;
		cycle_time = 0;
	}
	if (d) {
		d->pio_mode = pio_mode;
		d->cycle_time = cycle_time ? cycle_time : ide_pio_timings[pio_mode].cycle_time;
	}
	return pio_mode;
}

EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);

/**
 *	ide_toggle_bounce	-	handle bounce buffering
 *	@drive: drive to update
 *	@on: on/off boolean
 *
 *	Enable or disable bounce buffering for the device. Drives move
 *	between PIO and DMA and that changes the rules we need.
 */
 
void ide_toggle_bounce(ide_drive_t *drive, int on)
{
	u64 addr = BLK_BOUNCE_HIGH;	/* dma64_addr_t */

	if (!PCI_DMA_BUS_IS_PHYS) {
		addr = BLK_BOUNCE_ANY;
	} else if (on && drive->media == ide_disk) {
		if (HWIF(drive)->pci_dev)
			addr = HWIF(drive)->pci_dev->dma_mask;
	}

	if (drive->queue)
		blk_queue_bounce_limit(drive->queue, addr);
}

/**
 *	ide_set_xfer_rate	-	set transfer rate
 *	@drive: drive to set
 *	@speed: speed to attempt to set
 *	
 *	General helper for setting the speed of an IDE device. This
 *	function knows about user enforced limits from the configuration
 *	which speedproc() does not.  High level drivers should never
 *	invoke speedproc() directly.
 */
 
int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
{
#ifndef CONFIG_BLK_DEV_IDEDMA
	rate = min(rate, (u8) XFER_PIO_4);
#endif
	if(HWIF(drive)->speedproc)
		return HWIF(drive)->speedproc(drive, rate);
	else
		return -1;
}

static void ide_dump_opcode(ide_drive_t *drive)
{
	struct request *rq;
	u8 opcode = 0;
	int found = 0;

	spin_lock(&ide_lock);
	rq = NULL;
	if (HWGROUP(drive))
		rq = HWGROUP(drive)->rq;
	spin_unlock(&ide_lock);
	if (!rq)
		return;
	if (rq->cmd_type == REQ_TYPE_ATA_CMD ||
	    rq->cmd_type == REQ_TYPE_ATA_TASK) {
		char *args = rq->buffer;
		if (args) {
			opcode = args[0];
			found = 1;
		}
	} else if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
		ide_task_t *args = rq->special;
		if (args) {
			task_struct_t *tf = (task_struct_t *) args->tfRegister;
			opcode = tf->command;
			found = 1;
		}
	}

	printk("ide: failed opcode was: ");
	if (!found)
		printk("unknown\n");
	else
		printk("0x%02x\n", opcode);
}

static u8 ide_dump_ata_status(ide_drive_t *drive, const char *msg, u8 stat)
{
	ide_hwif_t *hwif = HWIF(drive);
	unsigned long flags;
	u8 err = 0;

	local_irq_save(flags);
	printk("%s: %s: status=0x%02x { ", drive->name, msg, stat);
	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("}\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 (err & ABRT_ERR)	printk("DriveStatusError ");
		if (err & ICRC_ERR)
			printk((err & ABRT_ERR) ? "BadCRC " : "BadSector ");
		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->addressing == 1) {
				__u64 sectors = 0;
				u32 low = 0, high = 0;
				low = ide_read_24(drive);
				hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
				high = ide_read_24(drive);
				sectors = ((__u64)high << 24) | low;
				printk(", LBAsect=%llu, high=%d, low=%d",
				       (unsigned 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);
		}
		printk("\n");
	}
	ide_dump_opcode(drive);
	local_irq_restore(flags);
	return err;
}

/**
 *	ide_dump_atapi_status       -       print human readable atapi status
 *	@drive: drive that status applies to
 *	@msg: text message to print
 *	@stat: status byte to decode
 *
 *	Error reporting, in human readable form (luxurious, but a memory hog).
 */

static u8 ide_dump_atapi_status(ide_drive_t *drive, const char *msg, u8 stat)
{
	unsigned long flags;

	atapi_status_t status;
	atapi_error_t error;

	status.all = stat;
	error.all = 0;
	local_irq_save(flags);
	printk("%s: %s: status=0x%02x { ", drive->name, msg, stat);
	if (status.b.bsy)
		printk("Busy ");
	else {
		if (status.b.drdy)	printk("DriveReady ");
		if (status.b.df)	printk("DeviceFault ");
		if (status.b.dsc)	printk("SeekComplete ");
		if (status.b.drq)	printk("DataRequest ");
		if (status.b.corr)	printk("CorrectedError ");
		if (status.b.idx)	printk("Index ");
		if (status.b.check)	printk("Error ");
	}
	printk("}\n");
	if (status.b.check && !status.b.bsy) {
		error.all = HWIF(drive)->INB(IDE_ERROR_REG);
		printk("%s: %s: error=0x%02x { ", drive->name, msg, error.all);
		if (error.b.ili)	printk("IllegalLengthIndication ");
		if (error.b.eom)	printk("EndOfMedia ");
		if (error.b.abrt)	printk("AbortedCommand ");
		if (error.b.mcr)	printk("MediaChangeRequested ");
		if (error.b.sense_key)	printk("LastFailedSense=0x%02x ",
						error.b.sense_key);
		printk("}\n");
	}
	ide_dump_opcode(drive);
	local_irq_restore(flags);
	return error.all;
}

/**
 *	ide_dump_status		-	translate ATA/ATAPI error
 *	@drive: drive the error occured on
 *	@msg: information string
 *	@stat: status byte
 *
 *	Error reporting, in human readable form (luxurious, but a memory hog).
 *	Combines the drive name, message and status byte to provide a
 *	user understandable explanation of the device error.
 */

u8 ide_dump_status(ide_drive_t *drive, const char *msg, u8 stat)
{
	if (drive->media == ide_disk)
		return ide_dump_ata_status(drive, msg, stat);
	return ide_dump_atapi_status(drive, msg, stat);
}

EXPORT_SYMBOL(ide_dump_status);
Commit	Line	Data
1da177e4 LT	1	#include <linux/module.h>
	2	#include <linux/types.h>
	3	#include <linux/string.h>
	4	#include <linux/kernel.h>
	5	#include <linux/timer.h>
	6	#include <linux/mm.h>
	7	#include <linux/interrupt.h>
	8	#include <linux/major.h>
	9	#include <linux/errno.h>
	10	#include <linux/genhd.h>
	11	#include <linux/blkpg.h>
	12	#include <linux/slab.h>
	13	#include <linux/pci.h>
	14	#include <linux/delay.h>
	15	#include <linux/hdreg.h>
	16	#include <linux/ide.h>
	17	#include <linux/bitops.h>
	18
	19	#include <asm/byteorder.h>
	20	#include <asm/irq.h>
	21	#include <asm/uaccess.h>
	22	#include <asm/io.h>
	23
	24	/*
	25	* IDE library routines. These are plug in code that most
	26	* drivers can use but occasionally may be weird enough
	27	* to want to do their own thing with
	28	*
	29	* Add common non I/O op stuff here. Make sure it has proper
	30	* kernel-doc function headers or your patch will be rejected
	31	*/
	32
	33
	34	/**
	35	* ide_xfer_verbose - return IDE mode names
	36	* @xfer_rate: rate to name
	37	*
	38	* Returns a constant string giving the name of the mode
	39	* requested.
	40	*/
	41
	42	char *ide_xfer_verbose (u8 xfer_rate)
	43	{
	44	switch(xfer_rate) {
	45	case XFER_UDMA_7: return("UDMA 7");
	46	case XFER_UDMA_6: return("UDMA 6");
	47	case XFER_UDMA_5: return("UDMA 5");
	48	case XFER_UDMA_4: return("UDMA 4");
	49	case XFER_UDMA_3: return("UDMA 3");
	50	case XFER_UDMA_2: return("UDMA 2");
	51	case XFER_UDMA_1: return("UDMA 1");
	52	case XFER_UDMA_0: return("UDMA 0");
	53	case XFER_MW_DMA_2: return("MW DMA 2");
	54	case XFER_MW_DMA_1: return("MW DMA 1");
	55	case XFER_MW_DMA_0: return("MW DMA 0");
	56	case XFER_SW_DMA_2: return("SW DMA 2");
	57	case XFER_SW_DMA_1: return("SW DMA 1");
	58	case XFER_SW_DMA_0: return("SW DMA 0");
	59	case XFER_PIO_4: return("PIO 4");
	60	case XFER_PIO_3: return("PIO 3");
	61	case XFER_PIO_2: return("PIO 2");
	62	case XFER_PIO_1: return("PIO 1");
	63	case XFER_PIO_0: return("PIO 0");
	64	case XFER_PIO_SLOW: return("PIO SLOW");
65	default: return("XFER ERROR");
66	}
67	}
68
69	EXPORT_SYMBOL(ide_xfer_verbose);
70
71	/**
2d5eaa6d BZ	72	* ide_rate_filter - filter transfer mode
2d5eaa6d BZ	73	* @drive: IDE device
1da177e4 LT	74	* @speed: desired speed
1da177e4 LT	75	*
2d5eaa6d	76	* Given the available transfer modes this function returns
1da177e4	77	* the best available speed at or below the speed requested.
2d5eaa6d BZ	78	*
2d5eaa6d BZ	79	* FIXME: filter also PIO/SWDMA/MWDMA modes
1da177e4 LT	80	*/
1da177e4 LT	81
2d5eaa6d	82	u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
1da177e4 LT	83	{
1da177e4 LT	84	#ifdef CONFIG_BLK_DEV_IDEDMA
2d5eaa6d BZ	85	ide_hwif_t *hwif = drive->hwif;
	86	u8 mask = hwif->ultra_mask, mode = XFER_MW_DMA_2;
	87
	88	if (hwif->udma_filter)
	89	mask = hwif->udma_filter(drive);
	90
7f8f48af BZ	91	/*
	92	* TODO: speed > XFER_UDMA_2 extra check is needed to avoid false
	93	* cable warning from eighty_ninty_three(), moving ide_rate_filter()
	94	* calls from ->speedproc to core code will make this hack go away
	95	*/
	96	if (speed > XFER_UDMA_2) {
	97	if ((mask & 0x78) && (eighty_ninty_three(drive) == 0))
	98	mask &= 0x07;
	99	}
2d5eaa6d BZ	100
	101	if (mask)
	102	mode = fls(mask) - 1 + XFER_UDMA_0;
1da177e4 LT	103
	104	// printk("%s: mode 0x%02x, speed 0x%02x\n", __FUNCTION__, mode, speed);
	105
2d5eaa6d	106	return min(speed, mode);
1da177e4 LT	107	#else /* !CONFIG_BLK_DEV_IDEDMA */
	108	return min(speed, (u8)XFER_PIO_4);
	109	#endif /* CONFIG_BLK_DEV_IDEDMA */
	110	}
	111
	112	EXPORT_SYMBOL(ide_rate_filter);
	113
7569e8dc BZ	114	int ide_use_fast_pio(ide_drive_t *drive)
	115	{
	116	struct hd_driveid *id = drive->id;
	117
	118	if ((id->capability & 1) && drive->autodma)
	119	return 1;
	120
	121	if ((id->capability & 8) \|\| (id->field_valid & 2))
	122	return 1;
	123
	124	return 0;
	125	}
	126
	127	EXPORT_SYMBOL_GPL(ide_use_fast_pio);
	128
1da177e4 LT	129	/*
	130	* Standard (generic) timings for PIO modes, from ATA2 specification.
	131	* These timings are for access to the IDE data port register only.
	132	* Some drives may specify a mode, while also specifying a different
	133	* value for cycle_time (from drive identification data).
	134	*/
	135	const ide_pio_timings_t ide_pio_timings[6] = {
	136	{ 70, 165, 600 }, /* PIO Mode 0 */
	137	{ 50, 125, 383 }, /* PIO Mode 1 */
	138	{ 30, 100, 240 }, /* PIO Mode 2 */
	139	{ 30, 80, 180 }, /* PIO Mode 3 with IORDY */
	140	{ 25, 70, 120 }, /* PIO Mode 4 with IORDY */
	141	{ 20, 50, 100 } /* PIO Mode 5 with IORDY (nonstandard) */
	142	};
	143
	144	EXPORT_SYMBOL_GPL(ide_pio_timings);
	145
	146	/*
	147	* Shared data/functions for determining best PIO mode for an IDE drive.
	148	* Most of this stuff originally lived in cmd640.c, and changes to the
	149	* ide_pio_blacklist[] table should be made with EXTREME CAUTION to avoid
	150	* breaking the fragile cmd640.c support.
	151	*/
	152
	153	/*
	154	* Black list. Some drives incorrectly report their maximal PIO mode,
	155	* at least in respect to CMD640. Here we keep info on some known drives.
	156	*/
	157	static struct ide_pio_info {
	158	const char *name;
	159	int pio;
	160	} ide_pio_blacklist [] = {
	161	/* { "Conner Peripherals 1275MB - CFS1275A", 4 }, */
	162	{ "Conner Peripherals 540MB - CFS540A", 3 },
	163
	164	{ "WDC AC2700", 3 },
	165	{ "WDC AC2540", 3 },
	166	{ "WDC AC2420", 3 },
	167	{ "WDC AC2340", 3 },
	168	{ "WDC AC2250", 0 },
	169	{ "WDC AC2200", 0 },
	170	{ "WDC AC21200", 4 },
	171	{ "WDC AC2120", 0 },
	172	{ "WDC AC2850", 3 },
	173	{ "WDC AC1270", 3 },
	174	{ "WDC AC1170", 1 },
	175	{ "WDC AC1210", 1 },
	176	{ "WDC AC280", 0 },
	177	/* { "WDC AC21000", 4 }, */
	178	{ "WDC AC31000", 3 },
	179	{ "WDC AC31200", 3 },
	180	/* { "WDC AC31600", 4 }, */
	181
	182	{ "Maxtor 7131 AT", 1 },
	183	{ "Maxtor 7171 AT", 1 },
	184	{ "Maxtor 7213 AT", 1 },
	185	{ "Maxtor 7245 AT", 1 },
	186	{ "Maxtor 7345 AT", 1 },
	187	{ "Maxtor 7546 AT", 3 },
	188	{ "Maxtor 7540 AV", 3 },
	189
	190	{ "SAMSUNG SHD-3121A", 1 },
	191	{ "SAMSUNG SHD-3122A", 1 },
	192	{ "SAMSUNG SHD-3172A", 1 },
193
194	/* { "ST51080A", 4 },
195	* { "ST51270A", 4 },
196	* { "ST31220A", 4 },
197	* { "ST31640A", 4 },
198	* { "ST32140A", 4 },
199	* { "ST3780A", 4 },
200	*/
201	{ "ST5660A", 3 },
202	{ "ST3660A", 3 },
203	{ "ST3630A", 3 },
204	{ "ST3655A", 3 },
205	{ "ST3391A", 3 },
206	{ "ST3390A", 1 },
207	{ "ST3600A", 1 },
208	{ "ST3290A", 0 },
209	{ "ST3144A", 0 },
210	{ "ST3491A", 1 }, /* reports 3, should be 1 or 2 (depending on */
211	/* drive) according to Seagates FIND-ATA program */
212
213	{ "QUANTUM ELS127A", 0 },
214	{ "QUANTUM ELS170A", 0 },
215	{ "QUANTUM LPS240A", 0 },
216	{ "QUANTUM LPS210A", 3 },
217	{ "QUANTUM LPS270A", 3 },
218	{ "QUANTUM LPS365A", 3 },
219	{ "QUANTUM LPS540A", 3 },
220	{ "QUANTUM LIGHTNING 540A", 3 },
221	{ "QUANTUM LIGHTNING 730A", 3 },
222
223	{ "QUANTUM FIREBALL_540", 3 }, /* Older Quantum Fireballs don't work */
224	{ "QUANTUM FIREBALL_640", 3 },
225	{ "QUANTUM FIREBALL_1080", 3 },
226	{ "QUANTUM FIREBALL_1280", 3 },
227	{ NULL, 0 }
228	};
229
230	/**
231	* ide_scan_pio_blacklist - check for a blacklisted drive
232	* @model: Drive model string
233	*
234	* This routine searches the ide_pio_blacklist for an entry
235	* matching the start/whole of the supplied model name.
236	*
237	* Returns -1 if no match found.
238	* Otherwise returns the recommended PIO mode from ide_pio_blacklist[].
239	*/
240
241	static int ide_scan_pio_blacklist (char *model)
242	{
243	struct ide_pio_info *p;
244
245	for (p = ide_pio_blacklist; p->name != NULL; p++) {
246	if (strncmp(p->name, model, strlen(p->name)) == 0)
247	return p->pio;
248	}
249	return -1;
250	}
251
252	/**
253	* ide_get_best_pio_mode - get PIO mode from drive
81d368e0	254	* @drive: drive to consider
1da177e4	255	* @mode_wanted: preferred mode
81d368e0 SS	256	* @max_mode: highest allowed mode
81d368e0 SS	257	* @d: PIO data
1da177e4 LT	258	*
	259	* This routine returns the recommended PIO settings for a given drive,
	260	* based on the drive->id information and the ide_pio_blacklist[].
1da177e4	261	*
81d368e0 SS	262	* Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
81d368e0 SS	263	* This is used by most chipset support modules when "auto-tuning".
1da177e4 LT	264	*/
	265
	266	u8 ide_get_best_pio_mode (ide_drive_t drive, u8 mode_wanted, u8 max_mode, ide_pio_data_t d)
	267	{
	268	int pio_mode;
	269	int cycle_time = 0;
1da177e4 LT	270	struct hd_driveid* id = drive->id;
1da177e4 LT	271	int overridden = 0;
1da177e4 LT	272
	273	if (mode_wanted != 255) {
	274	pio_mode = mode_wanted;
	275	} else if (!drive->id) {
	276	pio_mode = 0;
	277	} else if ((pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
342cdb6d	278	printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
1da177e4 LT	279	} else {
	280	pio_mode = id->tPIO;
	281	if (pio_mode > 2) { /* 2 is maximum allowed tPIO value */
	282	pio_mode = 2;
	283	overridden = 1;
	284	}
	285	if (id->field_valid & 2) { /* drive implements ATA2? */
2229833c	286	if (id->capability & 8) { /* IORDY supported? */
1da177e4 LT	287	cycle_time = id->eide_pio_iordy;
	288	if (id->eide_pio_modes & 7) {
	289	overridden = 0;
	290	if (id->eide_pio_modes & 4)
	291	pio_mode = 5;
	292	else if (id->eide_pio_modes & 2)
	293	pio_mode = 4;
	294	else
	295	pio_mode = 3;
	296	}
	297	} else {
	298	cycle_time = id->eide_pio;
	299	}
	300	}
	301
342cdb6d BZ	302	if (overridden)
	303	printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
	304	drive->name);
	305
1da177e4 LT	306	/*
	307	* Conservative "downgrade" for all pre-ATA2 drives
	308	*/
	309	if (pio_mode && pio_mode < 4) {
	310	pio_mode--;
342cdb6d BZ	311	printk(KERN_INFO "%s: applying conservative "
342cdb6d BZ	312	"PIO \"downgrade\"\n", drive->name);
1da177e4 LT	313	if (cycle_time && cycle_time < ide_pio_timings[pio_mode].cycle_time)
	314	cycle_time = 0; /* use standard timing */
	315	}
	316	}
	317	if (pio_mode > max_mode) {
	318	pio_mode = max_mode;
	319	cycle_time = 0;
	320	}
	321	if (d) {
	322	d->pio_mode = pio_mode;
	323	d->cycle_time = cycle_time ? cycle_time : ide_pio_timings[pio_mode].cycle_time;
1da177e4 LT	324	}
	325	return pio_mode;
	326	}
	327
	328	EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
	329
	330	/**
	331	* ide_toggle_bounce - handle bounce buffering
	332	* @drive: drive to update
	333	* @on: on/off boolean
	334	*
	335	* Enable or disable bounce buffering for the device. Drives move
	336	* between PIO and DMA and that changes the rules we need.
	337	*/
	338
	339	void ide_toggle_bounce(ide_drive_t *drive, int on)
	340	{
	341	u64 addr = BLK_BOUNCE_HIGH; /* dma64_addr_t */
	342
6593178d JB	343	if (!PCI_DMA_BUS_IS_PHYS) {
	344	addr = BLK_BOUNCE_ANY;
	345	} else if (on && drive->media == ide_disk) {
	346	if (HWIF(drive)->pci_dev)
1da177e4 LT	347	addr = HWIF(drive)->pci_dev->dma_mask;
	348	}
	349
	350	if (drive->queue)
	351	blk_queue_bounce_limit(drive->queue, addr);
	352	}
	353
	354	/**
	355	* ide_set_xfer_rate - set transfer rate
	356	* @drive: drive to set
	357	* @speed: speed to attempt to set
	358	*
	359	* General helper for setting the speed of an IDE device. This
	360	* function knows about user enforced limits from the configuration
	361	* which speedproc() does not. High level drivers should never
	362	* invoke speedproc() directly.
	363	*/
	364
	365	int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
	366	{
	367	#ifndef CONFIG_BLK_DEV_IDEDMA
	368	rate = min(rate, (u8) XFER_PIO_4);
	369	#endif
	370	if(HWIF(drive)->speedproc)
	371	return HWIF(drive)->speedproc(drive, rate);
	372	else
	373	return -1;
	374	}
	375
1da177e4 LT	376	static void ide_dump_opcode(ide_drive_t *drive)
	377	{
	378	struct request *rq;
	379	u8 opcode = 0;
	380	int found = 0;
	381
	382	spin_lock(&ide_lock);
	383	rq = NULL;
	384	if (HWGROUP(drive))
	385	rq = HWGROUP(drive)->rq;
	386	spin_unlock(&ide_lock);
	387	if (!rq)
	388	return;
4aff5e23 JA	389	if (rq->cmd_type == REQ_TYPE_ATA_CMD \|\|
4aff5e23 JA	390	rq->cmd_type == REQ_TYPE_ATA_TASK) {
1da177e4 LT	391	char *args = rq->buffer;
	392	if (args) {
	393	opcode = args[0];
	394	found = 1;
	395	}
4aff5e23	396	} else if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
1da177e4 LT	397	ide_task_t *args = rq->special;
	398	if (args) {
	399	task_struct_t tf = (task_struct_t ) args->tfRegister;
	400	opcode = tf->command;
	401	found = 1;
	402	}
	403	}
	404
	405	printk("ide: failed opcode was: ");
	406	if (!found)
	407	printk("unknown\n");
	408	else
	409	printk("0x%02x\n", opcode);
	410	}
	411
	412	static u8 ide_dump_ata_status(ide_drive_t drive, const char msg, u8 stat)
	413	{
	414	ide_hwif_t *hwif = HWIF(drive);
	415	unsigned long flags;
	416	u8 err = 0;
	417
3d1c1cc9	418	local_irq_save(flags);
13bbbf28	419	printk("%s: %s: status=0x%02x { ", drive->name, msg, stat);
1da177e4 LT	420	if (stat & BUSY_STAT)
	421	printk("Busy ");
	422	else {
	423	if (stat & READY_STAT) printk("DriveReady ");
	424	if (stat & WRERR_STAT) printk("DeviceFault ");
	425	if (stat & SEEK_STAT) printk("SeekComplete ");
	426	if (stat & DRQ_STAT) printk("DataRequest ");
	427	if (stat & ECC_STAT) printk("CorrectedError ");
	428	if (stat & INDEX_STAT) printk("Index ");
	429	if (stat & ERR_STAT) printk("Error ");
	430	}
13bbbf28	431	printk("}\n");
1da177e4 LT	432	if ((stat & (BUSY_STAT\|ERR_STAT)) == ERR_STAT) {
1da177e4 LT	433	err = hwif->INB(IDE_ERROR_REG);
13bbbf28	434	printk("%s: %s: error=0x%02x { ", drive->name, msg, err);
1da177e4 LT	435	if (err & ABRT_ERR) printk("DriveStatusError ");
1da177e4 LT	436	if (err & ICRC_ERR)
13bbbf28	437	printk((err & ABRT_ERR) ? "BadCRC " : "BadSector ");
1da177e4 LT	438	if (err & ECC_ERR) printk("UncorrectableError ");
	439	if (err & ID_ERR) printk("SectorIdNotFound ");
	440	if (err & TRK0_ERR) printk("TrackZeroNotFound ");
	441	if (err & MARK_ERR) printk("AddrMarkNotFound ");
	442	printk("}");
	443	if ((err & (BBD_ERR \| ABRT_ERR)) == BBD_ERR \|\|
	444	(err & (ECC_ERR\|ID_ERR\|MARK_ERR))) {
	445	if (drive->addressing == 1) {
	446	__u64 sectors = 0;
	447	u32 low = 0, high = 0;
	448	low = ide_read_24(drive);
	449	hwif->OUTB(drive->ctl\|0x80, IDE_CONTROL_REG);
	450	high = ide_read_24(drive);
	451	sectors = ((__u64)high << 24) \| low;
	452	printk(", LBAsect=%llu, high=%d, low=%d",
	453	(unsigned long long) sectors,
	454	high, low);
	455	} else {
	456	u8 cur = hwif->INB(IDE_SELECT_REG);
	457	if (cur & 0x40) { /* using LBA? */
	458	printk(", LBAsect=%ld", (unsigned long)
	459	((cur&0xf)<<24)
	460	\|(hwif->INB(IDE_HCYL_REG)<<16)
	461	\|(hwif->INB(IDE_LCYL_REG)<<8)
	462	\| hwif->INB(IDE_SECTOR_REG));
	463	} else {
	464	printk(", CHS=%d/%d/%d",
	465	(hwif->INB(IDE_HCYL_REG)<<8) +
	466	hwif->INB(IDE_LCYL_REG),
	467	cur & 0xf,
	468	hwif->INB(IDE_SECTOR_REG));
	469	}
	470	}
	471	if (HWGROUP(drive) && HWGROUP(drive)->rq)
	472	printk(", sector=%llu",
	473	(unsigned long long)HWGROUP(drive)->rq->sector);
	474	}
13bbbf28	475	printk("\n");
1da177e4	476	}
1da177e4 LT	477	ide_dump_opcode(drive);
	478	local_irq_restore(flags);
	479	return err;
	480	}
	481
	482	/**
	483	* ide_dump_atapi_status - print human readable atapi status
	484	* @drive: drive that status applies to
	485	* @msg: text message to print
	486	* @stat: status byte to decode
	487	*
	488	* Error reporting, in human readable form (luxurious, but a memory hog).
	489	*/
	490
	491	static u8 ide_dump_atapi_status(ide_drive_t drive, const char msg, u8 stat)
	492	{
	493	unsigned long flags;
	494
	495	atapi_status_t status;
	496	atapi_error_t error;
	497
	498	status.all = stat;
	499	error.all = 0;
3d1c1cc9	500	local_irq_save(flags);
1da177e4 LT	501	printk("%s: %s: status=0x%02x { ", drive->name, msg, stat);
	502	if (status.b.bsy)
	503	printk("Busy ");
	504	else {
	505	if (status.b.drdy) printk("DriveReady ");
	506	if (status.b.df) printk("DeviceFault ");
	507	if (status.b.dsc) printk("SeekComplete ");
	508	if (status.b.drq) printk("DataRequest ");
	509	if (status.b.corr) printk("CorrectedError ");
	510	if (status.b.idx) printk("Index ");
	511	if (status.b.check) printk("Error ");
	512	}
	513	printk("}\n");
	514	if (status.b.check && !status.b.bsy) {
	515	error.all = HWIF(drive)->INB(IDE_ERROR_REG);
	516	printk("%s: %s: error=0x%02x { ", drive->name, msg, error.all);
	517	if (error.b.ili) printk("IllegalLengthIndication ");
	518	if (error.b.eom) printk("EndOfMedia ");
	519	if (error.b.abrt) printk("AbortedCommand ");
	520	if (error.b.mcr) printk("MediaChangeRequested ");
	521	if (error.b.sense_key) printk("LastFailedSense=0x%02x ",
	522	error.b.sense_key);
	523	printk("}\n");
	524	}
	525	ide_dump_opcode(drive);
	526	local_irq_restore(flags);
	527	return error.all;
	528	}
	529
	530	/**
	531	* ide_dump_status - translate ATA/ATAPI error
	532	* @drive: drive the error occured on
	533	* @msg: information string
	534	* @stat: status byte
	535	*
	536	* Error reporting, in human readable form (luxurious, but a memory hog).
	537	* Combines the drive name, message and status byte to provide a
	538	* user understandable explanation of the device error.
	539	*/
	540
	541	u8 ide_dump_status(ide_drive_t drive, const char msg, u8 stat)
	542	{
	543	if (drive->media == ide_disk)
	544	return ide_dump_ata_status(drive, msg, stat);
	545	return ide_dump_atapi_status(drive, msg, stat);
	546	}
	547
	548	EXPORT_SYMBOL(ide_dump_status);