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ide: enhance ide_busy_sleep()

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* Make ide_busy_sleep() take timeout value as a parameter
  and also allow use of AltStatus Register if requested with
  altstatus parameter.  Update existing users accordingly.

* Convert ide_driveid_update() and actual_try_to_identify()
  to use ide_busy_sleep().

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-10-10 22:39:23 +02:00
parent c36a7e9884
commit b163f46d5e
3 changed files with 19 additions and 28 deletions
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15
drivers/ide/ide-iops.c
View file

@ -666,7 +666,7 @@ int ide_driveid_update(ide_drive_t *drive)
ide_hwif_t *hwif = drive->hwif;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
u16 *id;
unsigned long timeout, flags;
unsigned long flags;
u8 stat;
/*
@ -678,16 +678,11 @@ int ide_driveid_update(ide_drive_t *drive)
tp_ops->set_irq(hwif, 0);
msleep(50);
tp_ops->exec_command(hwif, ATA_CMD_ID_ATA);
timeout = jiffies + WAIT_WORSTCASE;
do {
if (time_after(jiffies, timeout)) {
SELECT_MASK(drive, 0);
return 0; /* drive timed-out */
}
msleep(50); /* give drive a breather */
stat = tp_ops->read_altstatus(hwif);
} while (stat & ATA_BUSY);
if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 1)) {
SELECT_MASK(drive, 0);
return 0;
}
msleep(50); /* wait for IRQ and ATA_DRQ */
stat = tp_ops->read_status(hwif);

30
drivers/ide/ide-probe.c
View file

@ -291,17 +291,9 @@ static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
tp_ops->exec_command(hwif, cmd);
timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
timeout += jiffies;
do {
if (time_after(jiffies, timeout)) {
/* drive timed-out */
return 1;
}
/* give drive a breather */
msleep(50);
s = use_altstatus ? tp_ops->read_altstatus(hwif)
: tp_ops->read_status(hwif);
} while (s & ATA_BUSY);
if (ide_busy_sleep(hwif, timeout, use_altstatus))
return 1;
/* wait for IRQ and ATA_DRQ */
msleep(50);
@ -383,19 +375,21 @@ static int try_to_identify (ide_drive_t *drive, u8 cmd)
return retval;
}
static int ide_busy_sleep(ide_hwif_t *hwif)
int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
{
unsigned long timeout = jiffies + WAIT_WORSTCASE;
u8 stat;
timeout += jiffies;
do {
msleep(50);
stat = hwif->tp_ops->read_status(hwif);
msleep(50); /* give drive a breather */
stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
: hwif->tp_ops->read_status(hwif);
if ((stat & ATA_BUSY) == 0)
return 0;
} while (time_before(jiffies, timeout));
return 1;
return 1; /* drive timed-out */
}
static u8 ide_read_device(ide_drive_t *drive)
@ -489,7 +483,7 @@ static int do_probe (ide_drive_t *drive, u8 cmd)
SELECT_DRIVE(drive);
msleep(50);
tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
(void)ide_busy_sleep(hwif);
(void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
rc = try_to_identify(drive, cmd);
}
@ -529,7 +523,7 @@ static void enable_nest (ide_drive_t *drive)
msleep(50);
tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
if (ide_busy_sleep(hwif)) {
if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
printk(KERN_CONT "failed (timeout)\n");
return;
}

2
include/linux/ide.h
View file

@ -923,6 +923,8 @@ void ide_fix_driveid(u16 *);
extern void ide_fixstring(u8 *, const int, const int);
int ide_busy_sleep(ide_hwif_t *, unsigned long, int);
int ide_wait_stat(ide_startstop_t *, ide_drive_t *, u8, u8, unsigned long);
extern ide_startstop_t ide_do_reset (ide_drive_t *);