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[PATCH] sil24: add sil24_restart_controller

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When an error condition is raised by device via D2H FIS or SDB.  sil24
controller should be restarted by setting PORT_CS_INIT and waiting
until PORT_CS_RDY is asserted instead of resetting the controller.
This patch implements sil24_restart_controller for those cases.  This
patch also makes sure that PORT_CS_RDY is asserted on
sil24_reset_controller completion.

Signed-off-by: Tejun Heo <htejun@gmail.com>

--

Jeff, delay is reduced to 1us and cnt increased to 10k.  My sil3124
turns on PORT_CS_RDY on the second iteration even without any delay.
I think 10k * 1us should be more than enough.

I tried to convert both restart and reset to use msleep's with work
queue, but if we do that, host_set lock should be released after
initiating restart or reset, leading to race condition among
reset/restart, other interrupts and timeout.  Implementing
synchronization among those in low-level driver doesn't seem right.
Well, reduced timeout should work for the time being.

Thanks.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Tejun Heo 2005-11-18 14:09:05 +09:00 committed by Jeff Garzik
parent fc71fe40d2
commit 7d1ce682d0
1 changed files with 32 additions and 3 deletions
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35
drivers/scsi/sata_sil24.c
View File

@ -486,6 +486,31 @@ static void sil24_irq_clear(struct ata_port *ap)
/* unused */
}
static int __sil24_restart_controller(void __iomem *port)
{
u32 tmp;
int cnt;
writel(PORT_CS_INIT, port + PORT_CTRL_STAT);
/* Max ~10ms */
for (cnt = 0; cnt < 10000; cnt++) {
tmp = readl(port + PORT_CTRL_STAT);
if (tmp & PORT_CS_RDY)
return 0;
udelay(1);
}
return -1;
}
static void sil24_restart_controller(struct ata_port *ap)
{
if (__sil24_restart_controller((void __iomem *)ap->ioaddr.cmd_addr))
printk(KERN_ERR DRV_NAME
" ata%u: failed to restart controller\n", ap->id);
}
static int __sil24_reset_controller(void __iomem *port)
{
int cnt;
@ -505,7 +530,11 @@ static int __sil24_reset_controller(void __iomem *port)
if (tmp & PORT_CS_DEV_RST)
return -1;
return 0;
if (tmp & PORT_CS_RDY)
return 0;
return __sil24_restart_controller(port);
}
static void sil24_reset_controller(struct ata_port *ap)
@ -577,6 +606,7 @@ static void sil24_error_intr(struct ata_port *ap, u32 slot_stat)
*/
sil24_update_tf(ap);
err_mask = ac_err_mask(pp->tf.command);
sil24_restart_controller(ap);
} else {
/*
* Other errors. libata currently doesn't have any
@ -584,12 +614,11 @@ static void sil24_error_intr(struct ata_port *ap, u32 slot_stat)
* ATA_ERR.
*/
err_mask = AC_ERR_OTHER;
sil24_reset_controller(ap);
}
if (qc)
ata_qc_complete(qc, err_mask);
sil24_reset_controller(ap);
}
static inline void sil24_host_intr(struct ata_port *ap)