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authorMikael Pettersson <mikpe@it.uu.se>2009-09-15 15:08:47 +0200
committerJeff Garzik <jgarzik@redhat.com>2009-09-17 16:46:34 -0400
commitff7cddf59e3618d29e12b061651ab3f5a53f4a98 (patch)
treeb45b879b6ca820b074ea69ee218f92247932ebd4
parent0ae6654da437db4ae6333d232e718b570c7a3eac (diff)
downloadlinux-linaro-stable-ff7cddf59e3618d29e12b061651ab3f5a53f4a98.tar.gz
sata_promise: update reset code
sata_promise's reset code has deviated quite a bit from the Promise reference driver's, and it has been observed to fail to recover from errors in some cases. This patch thus updates the reset code to more closely match the reference driver: - soft reset (pdc_reset_port): * wait for ATA engine to not be in packet command mode (2nd gen only) * write reset bit in PDC_CTLSTAT before the first read in the loop * for 2nd gen SATA follow up with FPDMA reset and clearing error status registers - hard reset (pdc_sata_hardreset): * wait for ATA engine to not be in packet command mode (2nd gen only) * reset ATA engine via the PCI control register * Tejun's change to use non-waiting hardreset + follow-up SRST I'm not changing the hotplug mask bits since they are taken care of by sata_promise's ->freeze() and ->thaw() operations. And I'm not writing the PMP port # because that's always zero (for now). Tested here on various controllers. In particular, one disk which used to timeout and fail to recover from certain hdparm and smartmonctl commands now works nicely. Signed-off-by: Mikael Pettersson <mikpe@it.uu.se> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
-rw-r--r--drivers/ata/sata_promise.c121
1 files changed, 120 insertions, 1 deletions
diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index 4d18d5a59afe..07d8d00b4d34 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -56,6 +56,7 @@ enum {
/* host register offsets (from host->iomap[PDC_MMIO_BAR]) */
PDC_INT_SEQMASK = 0x40, /* Mask of asserted SEQ INTs */
PDC_FLASH_CTL = 0x44, /* Flash control register */
+ PDC_PCI_CTL = 0x48, /* PCI control/status reg */
PDC_SATA_PLUG_CSR = 0x6C, /* SATA Plug control/status reg */
PDC2_SATA_PLUG_CSR = 0x60, /* SATAII Plug control/status reg */
PDC_TBG_MODE = 0x41C, /* TBG mode (not SATAII) */
@@ -75,7 +76,17 @@ enum {
PDC_CTLSTAT = 0x60, /* IDE control and status (per port) */
/* per-port SATA register offsets (from ap->ioaddr.scr_addr) */
+ PDC_SATA_ERROR = 0x04,
PDC_PHYMODE4 = 0x14,
+ PDC_LINK_LAYER_ERRORS = 0x6C,
+ PDC_FPDMA_CTLSTAT = 0xD8,
+ PDC_INTERNAL_DEBUG_1 = 0xF8, /* also used for PATA */
+ PDC_INTERNAL_DEBUG_2 = 0xFC, /* also used for PATA */
+
+ /* PDC_FPDMA_CTLSTAT bit definitions */
+ PDC_FPDMA_CTLSTAT_RESET = 1 << 3,
+ PDC_FPDMA_CTLSTAT_DMASETUP_INT_FLAG = 1 << 10,
+ PDC_FPDMA_CTLSTAT_SETDB_INT_FLAG = 1 << 11,
/* PDC_GLOBAL_CTL bit definitions */
PDC_PH_ERR = (1 << 8), /* PCI error while loading packet */
@@ -359,12 +370,76 @@ static int pdc_sata_port_start(struct ata_port *ap)
return 0;
}
+static void pdc_fpdma_clear_interrupt_flag(struct ata_port *ap)
+{
+ void __iomem *sata_mmio = ap->ioaddr.scr_addr;
+ u32 tmp;
+
+ tmp = readl(sata_mmio + PDC_FPDMA_CTLSTAT);
+ tmp |= PDC_FPDMA_CTLSTAT_DMASETUP_INT_FLAG;
+ tmp |= PDC_FPDMA_CTLSTAT_SETDB_INT_FLAG;
+
+ /* It's not allowed to write to the entire FPDMA_CTLSTAT register
+ when NCQ is running. So do a byte-sized write to bits 10 and 11. */
+ writeb(tmp >> 8, sata_mmio + PDC_FPDMA_CTLSTAT + 1);
+ readb(sata_mmio + PDC_FPDMA_CTLSTAT + 1); /* flush */
+}
+
+static void pdc_fpdma_reset(struct ata_port *ap)
+{
+ void __iomem *sata_mmio = ap->ioaddr.scr_addr;
+ u8 tmp;
+
+ tmp = (u8)readl(sata_mmio + PDC_FPDMA_CTLSTAT);
+ tmp &= 0x7F;
+ tmp |= PDC_FPDMA_CTLSTAT_RESET;
+ writeb(tmp, sata_mmio + PDC_FPDMA_CTLSTAT);
+ readl(sata_mmio + PDC_FPDMA_CTLSTAT); /* flush */
+ udelay(100);
+ tmp &= ~PDC_FPDMA_CTLSTAT_RESET;
+ writeb(tmp, sata_mmio + PDC_FPDMA_CTLSTAT);
+ readl(sata_mmio + PDC_FPDMA_CTLSTAT); /* flush */
+
+ pdc_fpdma_clear_interrupt_flag(ap);
+}
+
+static void pdc_not_at_command_packet_phase(struct ata_port *ap)
+{
+ void __iomem *sata_mmio = ap->ioaddr.scr_addr;
+ unsigned int i;
+ u32 tmp;
+
+ /* check not at ASIC packet command phase */
+ for (i = 0; i < 100; ++i) {
+ writel(0, sata_mmio + PDC_INTERNAL_DEBUG_1);
+ tmp = readl(sata_mmio + PDC_INTERNAL_DEBUG_2);
+ if ((tmp & 0xF) != 1)
+ break;
+ udelay(100);
+ }
+}
+
+static void pdc_clear_internal_debug_record_error_register(struct ata_port *ap)
+{
+ void __iomem *sata_mmio = ap->ioaddr.scr_addr;
+
+ writel(0xffffffff, sata_mmio + PDC_SATA_ERROR);
+ writel(0xffff0000, sata_mmio + PDC_LINK_LAYER_ERRORS);
+}
+
static void pdc_reset_port(struct ata_port *ap)
{
void __iomem *ata_ctlstat_mmio = ap->ioaddr.cmd_addr + PDC_CTLSTAT;
unsigned int i;
u32 tmp;
+ if (ap->flags & PDC_FLAG_GEN_II)
+ pdc_not_at_command_packet_phase(ap);
+
+ tmp = readl(ata_ctlstat_mmio);
+ tmp |= PDC_RESET;
+ writel(tmp, ata_ctlstat_mmio);
+
for (i = 11; i > 0; i--) {
tmp = readl(ata_ctlstat_mmio);
if (tmp & PDC_RESET)
@@ -379,6 +454,11 @@ static void pdc_reset_port(struct ata_port *ap)
tmp &= ~PDC_RESET;
writel(tmp, ata_ctlstat_mmio);
readl(ata_ctlstat_mmio); /* flush */
+
+ if (sata_scr_valid(&ap->link) && (ap->flags & PDC_FLAG_GEN_II)) {
+ pdc_fpdma_reset(ap);
+ pdc_clear_internal_debug_record_error_register(ap);
+ }
}
static int pdc_pata_cable_detect(struct ata_port *ap)
@@ -706,11 +786,50 @@ static int pdc_pata_softreset(struct ata_link *link, unsigned int *class,
return ata_sff_softreset(link, class, deadline);
}
+static unsigned int pdc_ata_port_to_ata_no(const struct ata_port *ap)
+{
+ void __iomem *ata_mmio = ap->ioaddr.cmd_addr;
+ void __iomem *host_mmio = ap->host->iomap[PDC_MMIO_BAR];
+
+ /* ata_mmio == host_mmio + 0x200 + ata_no * 0x80 */
+ return (ata_mmio - host_mmio - 0x200) / 0x80;
+}
+
+static void pdc_hard_reset_port(struct ata_port *ap)
+{
+ void __iomem *host_mmio = ap->host->iomap[PDC_MMIO_BAR];
+ void __iomem *pcictl_b1_mmio = host_mmio + PDC_PCI_CTL + 1;
+ unsigned int ata_no = pdc_ata_port_to_ata_no(ap);
+ u8 tmp;
+
+ spin_lock(&ap->host->lock);
+
+ tmp = readb(pcictl_b1_mmio);
+ tmp &= ~(0x10 << ata_no);
+ writeb(tmp, pcictl_b1_mmio);
+ readb(pcictl_b1_mmio); /* flush */
+ udelay(100);
+ tmp |= (0x10 << ata_no);
+ writeb(tmp, pcictl_b1_mmio);
+ readb(pcictl_b1_mmio); /* flush */
+
+ spin_unlock(&ap->host->lock);
+}
+
static int pdc_sata_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
+ if (link->ap->flags & PDC_FLAG_GEN_II)
+ pdc_not_at_command_packet_phase(link->ap);
+ /* hotplug IRQs should have been masked by pdc_sata_freeze() */
+ pdc_hard_reset_port(link->ap);
pdc_reset_port(link->ap);
- return sata_sff_hardreset(link, class, deadline);
+
+ /* sata_promise can't reliably acquire the first D2H Reg FIS
+ * after hardreset. Do non-waiting hardreset and request
+ * follow-up SRST.
+ */
+ return sata_std_hardreset(link, class, deadline);
}
static void pdc_error_handler(struct ata_port *ap)