sata_fsl: Split hard and soft reset

Split sata_fsl_softreset() into hard and soft resets to make
error-handling more efficient & device and PMP detection more
reliable.

Also includes fix for PMP support, driver tested with Sil3726,
Sil4726 & Exar PMP controllers.

[AV: Also fixes resuming from deep sleep on MPC8315 CPUs]

Signed-off-by: Jiang Yutang <b14898@freescale.com>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 44 insertions, 40 deletions

diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index d344db42a00..172b57e6543 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -707,34 +707,17 @@ static unsigned int sata_fsl_dev_classify(struct ata_port *ap)
         return ata_dev_classify(&tf);
 }
 
-static int sata_fsl_prereset(struct ata_link *link, unsigned long deadline)
-{
-        /* FIXME: Never skip softreset, sata_fsl_softreset() is
-         * combination of soft and hard resets.  sata_fsl_softreset()
-         * needs to be splitted into soft and hard resets.
-         */
-        return 0;
-}
-
-static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
+static int sata_fsl_hardreset(struct ata_link *link, unsigned int *class,
                                         unsigned long deadline)
 {
         struct ata_port *ap = link->ap;
-        struct sata_fsl_port_priv *pp = ap->private_data;
         struct sata_fsl_host_priv *host_priv = ap->host->private_data;
         void __iomem *hcr_base = host_priv->hcr_base;
-        int pmp = sata_srst_pmp(link);
         u32 temp;
-        struct ata_taskfile tf;
-        u8 *cfis;
-        u32 Serror;
         int i = 0;
         unsigned long start_jiffies;
 
-        DPRINTK("in xx_softreset\n");
-
-        if (pmp != SATA_PMP_CTRL_PORT)
-                goto issue_srst;
+        DPRINTK("in xx_hardreset\n");
 
 try_offline_again:
         /*
@@ -749,7 +732,7 @@ try_offline_again:
 
         if (temp & ONLINE) {
                 ata_port_printk(ap, KERN_ERR,
-                                "Softreset failed, not off-lined %d\n", i);
+                                "Hardreset failed, not off-lined %d\n", i);
 
                 /*
                  * Try to offline controller atleast twice
@@ -761,7 +744,7 @@ try_offline_again:
                         goto try_offline_again;
         }
 
-        DPRINTK("softreset, controller off-lined\n");
+        DPRINTK("hardreset, controller off-lined\n");
         VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
         VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
 
@@ -786,11 +769,11 @@ try_offline_again:
 
         if (!(temp & ONLINE)) {
                 ata_port_printk(ap, KERN_ERR,
-                                "Softreset failed, not on-lined\n");
+                                "Hardreset failed, not on-lined\n");
                 goto err;
         }
 
-        DPRINTK("softreset, controller off-lined & on-lined\n");
+        DPRINTK("hardreset, controller off-lined & on-lined\n");
         VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
         VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
 
@@ -806,7 +789,7 @@ try_offline_again:
                                 "No Device OR PHYRDY change,Hstatus = 0x%x\n",
                                 ioread32(hcr_base + HSTATUS));
                 *class = ATA_DEV_NONE;
-                goto out;
+                return 0;
         }
 
         /*
@@ -819,11 +802,44 @@ try_offline_again:
         if ((temp & 0xFF) != 0x18) {
                 ata_port_printk(ap, KERN_WARNING, "No Signature Update\n");
                 *class = ATA_DEV_NONE;
-                goto out;
+                goto do_followup_srst;
         } else {
                 ata_port_printk(ap, KERN_INFO,
                                 "Signature Update detected @ %d msecs\n",
                                 jiffies_to_msecs(jiffies - start_jiffies));
+                *class = sata_fsl_dev_classify(ap);
+                return 0;
+        }
+
+do_followup_srst:
+        /*
+         * request libATA to perform follow-up softreset
+         */
+        return -EAGAIN;
+
+err:
+        return -EIO;
+}
+
+static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
+                                        unsigned long deadline)
+{
+        struct ata_port *ap = link->ap;
+        struct sata_fsl_port_priv *pp = ap->private_data;
+        struct sata_fsl_host_priv *host_priv = ap->host->private_data;
+        void __iomem *hcr_base = host_priv->hcr_base;
+        int pmp = sata_srst_pmp(link);
+        u32 temp;
+        struct ata_taskfile tf;
+        u8 *cfis;
+        u32 Serror;
+
+        DPRINTK("in xx_softreset\n");
+
+        if (ata_link_offline(link)) {
+                DPRINTK("PHY reports no device\n");
+                *class = ATA_DEV_NONE;
+                return 0;
         }
 
         /*
@@ -834,7 +850,6 @@ try_offline_again:
          * reached here, we can send a command to the target device
          */
 
-issue_srst:
         DPRINTK("Sending SRST/device reset\n");
 
         ata_tf_init(link->device, &tf);
@@ -860,6 +875,8 @@ issue_srst:
                 ioread32(CA + hcr_base), ioread32(CC + hcr_base));
 
         iowrite32(0xFFFF, CC + hcr_base);
+        if (pmp != SATA_PMP_CTRL_PORT)
+                iowrite32(pmp, CQPMP + hcr_base);
         iowrite32(1, CQ + hcr_base);
 
         temp = ata_wait_register(CQ + hcr_base, 0x1, 0x1, 1, 5000);
@@ -926,7 +943,6 @@ issue_srst:
                 VPRINTK("cereg = 0x%x\n", ioread32(hcr_base + CE));
         }
 
-out:
         return 0;
 
 err:
@@ -988,18 +1004,6 @@ static void sata_fsl_error_intr(struct ata_port *ap)
                 ehi->err_mask |= AC_ERR_ATA_BUS;
                 ehi->action |= ATA_EH_SOFTRESET;
 
-                /*
-                 * Ignore serror in case of fatal errors as we always want
-                 * to do a soft-reset of the FSL SATA controller. Analyzing
-                 * serror may cause libata to schedule a hard-reset action,
-                 * and hard-reset currently does not do controller
-                 * offline/online, causing command timeouts and leads to an
-                 * un-recoverable state, hence make libATA ignore
-                 * autopsy in case of fatal errors.
-                 */
-
-                ehi->flags |= ATA_EHI_NO_AUTOPSY;
-
                 freeze = 1;
         }
 
@@ -1267,8 +1271,8 @@ static struct ata_port_operations sata_fsl_ops = {
 
         .freeze = sata_fsl_freeze,
         .thaw = sata_fsl_thaw,
-        .prereset = sata_fsl_prereset,
         .softreset = sata_fsl_softreset,
+        .hardreset = sata_fsl_hardreset,
         .pmp_softreset = sata_fsl_softreset,
         .error_handler = sata_fsl_error_handler,
         .post_internal_cmd = sata_fsl_post_internal_cmd,