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linux/drivers/ide/ide-lib.c
Bartlomiej Zolnierkiewicz 467390a2a5 ide: remove stale comment from ide-lib.c 
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2008-02-11 00:32:15 +01:00

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#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>
static const char *udma_str[] =
{ "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44",
"UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
static const char *mwdma_str[] =
{ "MWDMA0", "MWDMA1", "MWDMA2" };
static const char *swdma_str[] =
{ "SWDMA0", "SWDMA1", "SWDMA2" };
static const char *pio_str[] =
{ "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5" };
/**
* ide_xfer_verbose - return IDE mode names
* @mode: transfer mode
*
* Returns a constant string giving the name of the mode
* requested.
*/
const char *ide_xfer_verbose(u8 mode)
{
const char *s;
u8 i = mode & 0xf;
if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
s = udma_str[i];
else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_2)
s = mwdma_str[i];
else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
s = swdma_str[i];
else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_5)
s = pio_str[i & 0x7];
else if (mode == XFER_PIO_SLOW)
s = "PIO SLOW";
else
s = "XFER ERROR";
return s;
}
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.
*
* TODO: check device PIO capabilities
*/
static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
{
ide_hwif_t *hwif = drive->hwif;
u8 mode = ide_find_dma_mode(drive, speed);
if (mode == 0) {
if (hwif->pio_mask)
mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
else
mode = XFER_PIO_4;
}
// printk("%s: mode 0x%02x, speed 0x%02x\n", __FUNCTION__, mode, speed);
return min(speed, mode);
}
/*
* 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;
}
unsigned int ide_pio_cycle_time(ide_drive_t *drive, u8 pio)
{
struct hd_driveid *id = drive->id;
int cycle_time = 0;
if (id->field_valid & 2) {
if (id->capability & 8)
cycle_time = id->eide_pio_iordy;
else
cycle_time = id->eide_pio;
}
/* conservative "downgrade" for all pre-ATA2 drives */
if (pio < 3) {
if (cycle_time && cycle_time < ide_pio_timings[pio].cycle_time)
cycle_time = 0; /* use standard timing */
}
return cycle_time ? cycle_time : ide_pio_timings[pio].cycle_time;
}
EXPORT_SYMBOL_GPL(ide_pio_cycle_time);
/**
* ide_get_best_pio_mode - get PIO mode from drive
* @drive: drive to consider
* @mode_wanted: preferred mode
* @max_mode: highest allowed mode
*
* 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)
{
int pio_mode;
struct hd_driveid* id = drive->id;
int overridden = 0;
if (mode_wanted != 255)
return min_t(u8, mode_wanted, max_mode);
if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0 &&
(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? */
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;
}
}
}
if (overridden)
printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
drive->name);
/*
* Conservative "downgrade" for all pre-ATA2 drives
*/
if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_DOWNGRADE) == 0 &&
pio_mode && pio_mode < 4) {
pio_mode--;
printk(KERN_INFO "%s: applying conservative "
"PIO \"downgrade\"\n", drive->name);
}
}
if (pio_mode > max_mode)
pio_mode = max_mode;
return pio_mode;
}
EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
/* req_pio == "255" for auto-tune */
void ide_set_pio(ide_drive_t *drive, u8 req_pio)
{
ide_hwif_t *hwif = drive->hwif;
u8 host_pio, pio;
if (hwif->set_pio_mode == NULL)
return;
BUG_ON(hwif->pio_mask == 0x00);
host_pio = fls(hwif->pio_mask) - 1;
pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
/*
* TODO:
* - report device max PIO mode
* - check req_pio != 255 against device max PIO mode
*/
printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
drive->name, host_pio, req_pio,
req_pio == 255 ? "(auto-tune)" : "", pio);
(void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
}
EXPORT_SYMBOL_GPL(ide_set_pio);
/**
* 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) {
struct device *dev = drive->hwif->dev;
if (dev && dev->dma_mask)
addr = *dev->dma_mask;
}
if (drive->queue)
blk_queue_bounce_limit(drive->queue, addr);
}
int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
{
ide_hwif_t *hwif = drive->hwif;
if (hwif->set_pio_mode == NULL)
return -1;
/*
* TODO: temporary hack for some legacy host drivers that didn't
* set transfer mode on the device in ->set_pio_mode method...
*/
if (hwif->set_dma_mode == NULL) {
hwif->set_pio_mode(drive, mode - XFER_PIO_0);
return 0;
}
if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
if (ide_config_drive_speed(drive, mode))
return -1;
hwif->set_pio_mode(drive, mode - XFER_PIO_0);
return 0;
} else {
hwif->set_pio_mode(drive, mode - XFER_PIO_0);
return ide_config_drive_speed(drive, mode);
}
}
int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
{
ide_hwif_t *hwif = drive->hwif;
if (hwif->set_dma_mode == NULL)
return -1;
if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
if (ide_config_drive_speed(drive, mode))
return -1;
hwif->set_dma_mode(drive, mode);
return 0;
} else {
hwif->set_dma_mode(drive, mode);
return ide_config_drive_speed(drive, mode);
}
}
EXPORT_SYMBOL_GPL(ide_set_dma_mode);
/**
* ide_set_xfer_rate - set transfer rate
* @drive: drive to set
* @rate: 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 ->set_pio_mode/->set_dma_mode does not.
*/
int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
{
ide_hwif_t *hwif = drive->hwif;
if (hwif->set_dma_mode == NULL)
return -1;
rate = ide_rate_filter(drive, rate);
if (rate >= XFER_PIO_0 && rate <= XFER_PIO_5)
return ide_set_pio_mode(drive, rate);
/*
* TODO: transfer modes 0x00-0x07 passed from the user-space are
* currently handled here which needs fixing (please note that such
* case could happen iff the transfer mode has already been set on
* the device by ide-proc.c::set_xfer_rate()).
*/
if (rate < XFER_PIO_0) {
if (hwif->host_flags & IDE_HFLAG_ABUSE_SET_DMA_MODE)
return ide_set_dma_mode(drive, rate);
else
return ide_config_drive_speed(drive, rate);
}
return ide_set_dma_mode(drive, rate);
}
static void ide_dump_opcode(ide_drive_t *drive)
{
struct request *rq;
ide_task_t *task = NULL;
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_TASKFILE)
task = rq->special;
printk("ide: failed opcode was: ");
if (task == NULL)
printk(KERN_CONT "unknown\n");
else
printk(KERN_CONT "0x%02x\n", task->tf.command);
}
u64 ide_get_lba_addr(struct ide_taskfile *tf, int lba48)
{
u32 high, low;
if (lba48)
high = (tf->hob_lbah << 16) | (tf->hob_lbam << 8) |
tf->hob_lbal;
else
high = tf->device & 0xf;
low = (tf->lbah << 16) | (tf->lbam << 8) | tf->lbal;
return ((u64)high << 24) | low;
}
EXPORT_SYMBOL_GPL(ide_get_lba_addr);
static void ide_dump_sector(ide_drive_t *drive)
{
ide_task_t task;
struct ide_taskfile *tf = &task.tf;
int lba48 = (drive->addressing == 1) ? 1 : 0;
memset(&task, 0, sizeof(task));
if (lba48)
task.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_HOB_LBA |
IDE_TFLAG_LBA48;
else
task.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_DEVICE;
ide_tf_read(drive, &task);
if (lba48 || (tf->device & ATA_LBA))
printk(", LBAsect=%llu",
(unsigned long long)ide_get_lba_addr(tf, lba48));
else
printk(", CHS=%d/%d/%d", (tf->lbah << 8) + tf->lbam,
tf->device & 0xf, tf->lbal);
}
static void ide_dump_ata_error(ide_drive_t *drive, u8 err)
{
printk("{ ");
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))) {
ide_dump_sector(drive);
if (HWGROUP(drive) && HWGROUP(drive)->rq)
printk(", sector=%llu",
(unsigned long long)HWGROUP(drive)->rq->sector);
}
printk("\n");
}
static void ide_dump_atapi_error(ide_drive_t *drive, u8 err)
{
printk("{ ");
if (err & ILI_ERR) printk("IllegalLengthIndication ");
if (err & EOM_ERR) printk("EndOfMedia ");
if (err & ABRT_ERR) printk("AbortedCommand ");
if (err & MCR_ERR) printk("MediaChangeRequested ");
if (err & LFS_ERR) printk("LastFailedSense=0x%02x ",
(err & LFS_ERR) >> 4);
printk("}\n");
}
/**
* ide_dump_status - translate ATA/ATAPI error
* @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).
* 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)
{
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 = ide_read_error(drive);
printk("%s: %s: error=0x%02x ", drive->name, msg, err);
if (drive->media == ide_disk)
ide_dump_ata_error(drive, err);
else
ide_dump_atapi_error(drive, err);
}
ide_dump_opcode(drive);
local_irq_restore(flags);
return err;
}
EXPORT_SYMBOL(ide_dump_status);
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