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>

1 files changed, 12 insertions, 50 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 6e8de3c1595..78912c5011a 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -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);
 }
 
 /**