Rework and simplify sata_mv's hardreset code to take advantage
of libata improvements since it was first coded.
Also, get rid of the now unnecessary prereset, postreset, and phy_reset functions.
This patch also paves the way for subsequent pmp support patches,
which will follow once this one passes muster.
Signed-off-by: Mark Lord <mlord@xxxxxxxxx>
--- old/drivers/ata/sata_mv.c 2008-04-10 14:30:27.000000000 -0400
+++ linux/drivers/ata/sata_mv.c 2008-04-10 14:31:01.000000000 -0400
@@ -478,10 +478,8 @@
static void mv_qc_prep(struct ata_queued_cmd *qc);
static void mv_qc_prep_iie(struct ata_queued_cmd *qc);
static unsigned int mv_qc_issue(struct ata_queued_cmd *qc);
-static int mv_prereset(struct ata_link *link, unsigned long deadline);
static int mv_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
-static void mv_postreset(struct ata_link *link, unsigned int *classes);
static void mv_eh_freeze(struct ata_port *ap);
static void mv_eh_thaw(struct ata_port *ap);
static void mv6_dev_config(struct ata_device *dev);
@@ -545,9 +543,7 @@
.freeze = mv_eh_freeze,
.thaw = mv_eh_thaw,
- .prereset = mv_prereset,
.hardreset = mv_hardreset,
- .postreset = mv_postreset,
.error_handler = ata_std_error_handler, /* avoid SFF EH */
.post_internal_cmd = ATA_OP_NULL,
@@ -1904,7 +1900,6 @@
* (but doesn't say what the problem might be). So we first try
* to disable the EDMA engine before doing the ATA_RST operation.
*/
- mv_stop_edma_engine(port_mmio);
mv_reset_channel(hpriv, mmio, port);
ZERO(0x028); /* command */
@@ -2184,7 +2179,6 @@
* (but doesn't say what the problem might be). So we first try
* to disable the EDMA engine before doing the ATA_RST operation.
*/
- mv_stop_edma_engine(port_mmio);
mv_reset_channel(hpriv, mmio, port);
ZERO(0x028); /* command */
@@ -2261,6 +2255,7 @@
{
void __iomem *port_mmio = mv_port_base(mmio, port_no);
+ mv_stop_edma_engine(port_mmio);
writelfl(ATA_RST, port_mmio + EDMA_CMD_OFS);
if (!IS_GEN_I(hpriv)) {
@@ -2282,116 +2277,6 @@
mdelay(1);
}
-/**
- * mv_phy_reset - Perform eDMA reset followed by COMRESET
- * @ap: ATA channel to manipulate
- *
- * Part of this is taken from __sata_phy_reset and modified to
- * not sleep since this routine gets called from interrupt level.
- *
- * LOCKING:
- * Inherited from caller. This is coded to safe to call at
- * interrupt level, i.e. it does not sleep.
- */
-static void mv_phy_reset(struct ata_port *ap, unsigned int *class,
- unsigned long deadline)
-{
- struct mv_port_priv *pp = ap->private_data;
- struct mv_host_priv *hpriv = ap->host->private_data;
- void __iomem *port_mmio = mv_ap_base(ap);
- int retry = 5;
- u32 sstatus;
-
- VPRINTK("ENTER, port %u, mmio 0x%p\n", ap->port_no, port_mmio);
-
-#ifdef DEBUG
- {
- u32 sstatus, serror, scontrol;
-
- mv_scr_read(ap, SCR_STATUS, &sstatus);
- mv_scr_read(ap, SCR_ERROR, &serror);
- mv_scr_read(ap, SCR_CONTROL, &scontrol);
- DPRINTK("S-regs after ATA_RST: SStat 0x%08x SErr 0x%08x "
- "SCtrl 0x%08x\n", sstatus, serror, scontrol);
- }
-#endif
-
- /* Issue COMRESET via SControl */
-comreset_retry:
- sata_scr_write_flush(&ap->link, SCR_CONTROL, 0x301);
- msleep(1);
-
- sata_scr_write_flush(&ap->link, SCR_CONTROL, 0x300);
- msleep(20);
-
- do {
- sata_scr_read(&ap->link, SCR_STATUS, &sstatus);
- if (((sstatus & 0x3) == 3) || ((sstatus & 0x3) == 0))
- break;
-
- msleep(1);
- } while (time_before(jiffies, deadline));
-
- /* work around errata */
- if (IS_GEN_II(hpriv) &&
- (sstatus != 0x0) && (sstatus != 0x113) && (sstatus != 0x123) &&
- (retry-- > 0))
- goto comreset_retry;
-
-#ifdef DEBUG
- {
- u32 sstatus, serror, scontrol;
-
- mv_scr_read(ap, SCR_STATUS, &sstatus);
- mv_scr_read(ap, SCR_ERROR, &serror);
- mv_scr_read(ap, SCR_CONTROL, &scontrol);
- DPRINTK("S-regs after PHY wake: SStat 0x%08x SErr 0x%08x "
- "SCtrl 0x%08x\n", sstatus, serror, scontrol);
- }
-#endif
-
- if (ata_link_offline(&ap->link)) {
- *class = ATA_DEV_NONE;
- return;
- }
-
- /* even after SStatus reflects that device is ready,
- * it seems to take a while for link to be fully
- * established (and thus Status no longer 0x80/0x7F),
- * so we poll a bit for that, here.
- */
- retry = 20;
- while (1) {
- u8 drv_stat = ata_sff_check_status(ap);
- if ((drv_stat != 0x80) && (drv_stat != 0x7f))
- break;
- msleep(500);
- if (retry-- <= 0)
- break;
- if (time_after(jiffies, deadline))
- break;
- }
-
- /* FIXME: if we passed the deadline, the following
- * code probably produces an invalid result
- */
-
- /* finally, read device signature from TF registers */
- *class = ata_sff_dev_classify(ap->link.device, 1, NULL);
-
- writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
-
- WARN_ON(pp->pp_flags & MV_PP_FLAG_EDMA_EN);
-
- VPRINTK("EXIT\n");
-}
-
-static int mv_prereset(struct ata_link *link, unsigned long deadline)
-{
- mv_stop_edma(link->ap);
- return 0;
-}
-
static int mv_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
@@ -2399,34 +2284,33 @@
struct mv_host_priv *hpriv = ap->host->private_data;
struct mv_port_priv *pp = ap->private_data;
void __iomem *mmio = hpriv->base;
+ int rc, attempts = 0, extra = 0;
+ u32 sstatus;
+ bool online;
mv_reset_channel(hpriv, mmio, ap->port_no);
pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
- mv_phy_reset(ap, class, deadline);
-
- return 0;
-}
-
-static void mv_postreset(struct ata_link *link, unsigned int *classes)
-{
- struct ata_port *ap = link->ap;
- u32 serr;
- /* print link status */
- sata_print_link_status(link);
+ /* Workaround for errata FEr SATA#10 (part 2) */
+ do {
+ const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
- /* clear SError */
- sata_scr_read(link, SCR_ERROR, &serr);
- sata_scr_write_flush(link, SCR_ERROR, serr);
-
- /* bail out if no device is present */
- if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
- DPRINTK("EXIT, no device\n");
- return;
- }
+ rc = sata_link_hardreset(link, timing, deadline + extra, &online, NULL);
+ if (rc) {
+ ata_link_printk(link, KERN_ERR,
+ "COMRESET failed (errno=%d)\n", rc);
+ return rc;
+ }
+ sata_scr_read(link, SCR_STATUS, &sstatus);
+ if (!IS_GEN_I(hpriv) && ++attempts >= 5 && sstatus == 0x121) {
+ /* Force 1.5gb/s link speed and try again */
+ mv_setup_ifctl(mv_ap_base(ap), 0);
+ if (time_after(jiffies + HZ, deadline))
+ extra = HZ; /* only extend it once, max */
+ }
+ } while (sstatus != 0x0 && sstatus != 0x113 && sstatus != 0x123);
- /* set up device control */
- iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
+ return online ? -EAGAIN : rc;
}
static void mv_eh_freeze(struct ata_port *ap)
--
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