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ide: add ide_busy_sleep() helper 

Add ide_busy_sleep() helper and use it in do_probe(),
enable_nest() and probe_hwif().

As a nice side-effect this fixes a minor bug in do_probe()
(the code was reading status register without any delay).

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-01-26 20:13:09 +01:00
parent ce71ed9ba8
commit 3a5015cc9d
1 changed files with 21 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/ide/ide-probe.c
View File

@ -382,6 +382,20 @@ static int try_to_identify (ide_drive_t *drive, u8 cmd)
return retval;
}
static int ide_busy_sleep(ide_hwif_t *hwif)
{
unsigned long timeout = jiffies + WAIT_WORSTCASE;
u8 stat;
do {
msleep(50);
stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
if ((stat & BUSY_STAT) == 0)
return 0;
} while (time_before(jiffies, timeout));
return 1;
}
/**
* do_probe - probe an IDE device
@ -450,7 +464,6 @@ static int do_probe (ide_drive_t *drive, u8 cmd)
if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
((drive->autotune == IDE_TUNE_DEFAULT) ||
(drive->autotune == IDE_TUNE_AUTO))) {
unsigned long timeout;
printk("%s: no response (status = 0x%02x), "
"resetting drive\n", drive->name,
hwif->INB(IDE_STATUS_REG));
@ -458,10 +471,7 @@ static int do_probe (ide_drive_t *drive, u8 cmd)
hwif->OUTB(drive->select.all, IDE_SELECT_REG);
msleep(50);
hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
timeout = jiffies;
while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
time_before(jiffies, timeout + WAIT_WORSTCASE))
msleep(50);
(void)ide_busy_sleep(hwif);
rc = try_to_identify(drive, cmd);
}
if (rc == 1)
@ -489,20 +499,16 @@ static int do_probe (ide_drive_t *drive, u8 cmd)
static void enable_nest (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
unsigned long timeout;
printk("%s: enabling %s -- ", hwif->name, drive->id->model);
SELECT_DRIVE(drive);
msleep(50);
hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
timeout = jiffies + WAIT_WORSTCASE;
do {
if (time_after(jiffies, timeout)) {
printk("failed (timeout)\n");
return;
}
msleep(50);
} while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
if (ide_busy_sleep(hwif)) {
printk(KERN_CONT "failed (timeout)\n");
return;
}
msleep(50);
@ -783,18 +789,11 @@ static void probe_hwif(ide_hwif_t *hwif)
}
}
if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
unsigned long timeout = jiffies + WAIT_WORSTCASE;
u8 stat;
printk(KERN_WARNING "%s: reset\n", hwif->name);
hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
udelay(10);
hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
do {
msleep(50);
stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
} while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
(void)ide_busy_sleep(hwif);
}
local_irq_restore(flags);
/*