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authorTejun Heo <htejun@gmail.com>2005-11-18 14:09:05 +0900
committerJeff Garzik <jgarzik@pobox.com>2005-11-18 13:11:39 -0500
commit7d1ce682d08625258524d23ef5eb9e7ae261c1d0 (patch)
treec089afbea310f50e0e869610573125bbe3377300
parentfc71fe40d2bedcc57d3406bf2050481f8b3441b6 (diff)
[PATCH] sil24: add sil24_restart_controller
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>
-rw-r--r--drivers/scsi/sata_sil24.c35
1 files changed, 32 insertions, 3 deletions
diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c
index cb1933a3bd5..a6836a07a9e 100644
--- a/drivers/scsi/sata_sil24.c
+++ b/drivers/scsi/sata_sil24.c
@@ -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)