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libata: separate out ata_wait_ready() and implement ata_wait_after_reset() 

Factor out waiting logic (which is common to all ATA controllers) from
ata_sff_wait_ready() into ata_wait_ready().  ata_wait_ready() takes
@check_ready function pointer and uses it to poll for readiness.  This
allows non-SFF controllers to use ata_wait_ready() to wait for link
readiness.

This patch also implements ata_wait_after_reset() - generic version of
ata_sff_wait_after_reset() - using ata_wait_ready().

ata_sff_wait_ready() is reimplemented using ata_wait_ready() and
ata_sff_check_ready().  Functionality remains the same.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo 2008-04-07 22:47:19 +09:00 committed by Jeff Garzik
parent 705e76beb9
commit aa2731ad9a
4 changed files with 114 additions and 50 deletions
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98
drivers/ata/libata-core.c
View File

@ -3310,6 +3310,103 @@ int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
return rc;
}
/**
* ata_wait_ready - wait for link to become ready
* @link: link to be waited on
* @deadline: deadline jiffies for the operation
* @check_ready: callback to check link readiness
*
* Wait for @link to become ready. @check_ready should return
* positive number if @link is ready, 0 if it isn't, -ENODEV if
* link doesn't seem to be occupied, other errno for other error
* conditions.
*
* Transient -ENODEV conditions are allowed for
* ATA_TMOUT_FF_WAIT.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 if @linke is ready before @deadline; otherwise, -errno.
*/
int ata_wait_ready(struct ata_link *link, unsigned long deadline,
int (*check_ready)(struct ata_link *link))
{
unsigned long start = jiffies;
unsigned long nodev_deadline = start + ATA_TMOUT_FF_WAIT;
int warned = 0;
if (time_after(nodev_deadline, deadline))
nodev_deadline = deadline;
while (1) {
unsigned long now = jiffies;
int ready, tmp;
ready = tmp = check_ready(link);
if (ready > 0)
return 0;
/* -ENODEV could be transient. Ignore -ENODEV if link
* is online. Also, some SATA devices take a long
* time to clear 0xff after reset. For example,
* HHD424020F7SV00 iVDR needs >= 800ms while Quantum
* GoVault needs even more than that. Wait for
* ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
*
* Note that some PATA controllers (pata_ali) explode
* if status register is read more than once when
* there's no device attached.
*/
if (ready == -ENODEV) {
if (ata_link_online(link))
ready = 0;
else if ((link->ap->flags & ATA_FLAG_SATA) &&
!ata_link_offline(link) &&
time_before(now, nodev_deadline))
ready = 0;
}
if (ready)
return ready;
if (time_after(now, deadline))
return -EBUSY;
if (!warned && time_after(now, start + 5 * HZ) &&
(deadline - now > 3 * HZ)) {
ata_link_printk(link, KERN_WARNING,
"link is slow to respond, please be patient "
"(ready=%d)\n", tmp);
warned = 1;
}
msleep(50);
}
}
/**
* ata_wait_after_reset - wait for link to become ready after reset
* @link: link to be waited on
* @deadline: deadline jiffies for the operation
* @check_ready: callback to check link readiness
*
* Wait for @link to become ready after reset.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 if @linke is ready before @deadline; otherwise, -errno.
*/
extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
int (*check_ready)(struct ata_link *link))
{
msleep(ATA_WAIT_AFTER_RESET_MSECS);
return ata_wait_ready(link, deadline, check_ready);
}
/**
* sata_link_debounce - debounce SATA phy status
* @link: ATA link to debounce SATA phy status for
@ -6075,6 +6172,7 @@ EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
EXPORT_SYMBOL_GPL(ata_port_probe);
EXPORT_SYMBOL_GPL(ata_dev_disable);
EXPORT_SYMBOL_GPL(sata_set_spd);
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
EXPORT_SYMBOL_GPL(ata_std_prereset);

62
drivers/ata/libata-sff.c
View File

@ -308,6 +308,17 @@ int ata_sff_busy_sleep(struct ata_port *ap,
return 0;
}
static int ata_sff_check_ready(struct ata_link *link)
{
u8 status = link->ap->ops->sff_check_status(link->ap);
if (!(status & ATA_BUSY))
return 1;
if (status == 0xff)
return -ENODEV;
return 0;
}
/**
* ata_sff_wait_ready - sleep until BSY clears, or timeout
* @link: SFF link to wait ready status for
@ -324,56 +335,7 @@ int ata_sff_busy_sleep(struct ata_port *ap,
*/
int ata_sff_wait_ready(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
unsigned long start = jiffies;
unsigned long nodev_deadline = start + ATA_TMOUT_FF_WAIT;
int warned = 0;
if (time_after(nodev_deadline, deadline))
nodev_deadline = deadline;
while (1) {
u8 status = ap->ops->sff_check_status(ap);
unsigned long now = jiffies;
if (!(status & ATA_BUSY))
return 0;
/* No device status could be transient. Ignore it if
* link is online. Also, some SATA devices take a
* long time to clear 0xff after reset. For example,
* HHD424020F7SV00 iVDR needs >= 800ms while Quantum
* GoVault needs even more than that. Wait for
* ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
*
* Note that some PATA controllers (pata_ali) explode
* if status register is read more than once when
* there's no device attached.
*/
if (status == 0xff) {
if (ata_link_online(link))
status = ATA_BUSY;
else if ((link->ap->flags & ATA_FLAG_SATA) &&
!ata_link_offline(link) &&
time_before(now, nodev_deadline))
status = ATA_BUSY;
if (status == 0xff)
return -ENODEV;
}
if (time_after(now, deadline))
return -EBUSY;
if (!warned && time_after(now, start + 5 * HZ) &&
(deadline - now > 3 * HZ)) {
ata_link_printk(link, KERN_WARNING,
"link is slow to respond, please be patient "
"(Status 0x%x)\n", status);
warned = 1;
}
msleep(50);
}
return ata_wait_ready(link, deadline, ata_sff_check_ready);
}
/**

2
drivers/ata/libata.h
View File

@ -81,6 +81,8 @@ extern unsigned ata_exec_internal_sg(struct ata_device *dev,
int dma_dir, struct scatterlist *sg,
unsigned int n_elem, unsigned long timeout);
extern unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd);
extern int ata_wait_ready(struct ata_link *link, unsigned long deadline,
int (*check_ready)(struct ata_link *link));
extern int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
unsigned int flags, u16 *id);
extern int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags);

2
include/linux/libata.h
View File

@ -837,6 +837,8 @@ extern void sata_print_link_status(struct ata_link *link);
extern void ata_port_probe(struct ata_port *);
extern int sata_set_spd(struct ata_link *link);
extern int ata_std_prereset(struct ata_link *link, unsigned long deadline);
extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
int (*check_ready)(struct ata_link *link));
extern int sata_link_debounce(struct ata_link *link,
const unsigned long *params, unsigned long deadline);
extern int sata_link_resume(struct ata_link *link, const unsigned long *params,