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sata_mv add basic port multiplier support
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Add basic port-multiplier support to sata_mv.
This works in Command-based-switching mode for Gen-II chipsets,
and in FIS-based-switching mode for Gen-IIe chipsets.

Error handling remains at the primary port level for now
(works okay, but not great).  This will get fixed in a subsequent
patch series for IRQ/EH handling fixes.  There are also some
known NCQ/PMP errata to be dealt with in the near future,
once we have this basic PMP support in place.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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Mark Lord authored and Jeff Garzik committed Apr 17, 2008
1 parent 02c1f32 commit e49856d
Showing 1 changed file with 89 additions and 4 deletions.
93 changes: 89 additions & 4 deletions drivers/ata/sata_mv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@
5) Investigate problems with PCI Message Signalled Interrupts (MSI).
6) Add port multiplier support (intermediate)
6) Cache frequently-accessed registers in mv_port_priv to reduce overhead.
7) Fix/reenable hot plug/unplug (should happen as a side-effect of (2) above).
Expand Down Expand Up @@ -528,6 +528,12 @@ static int mv_stop_edma(struct ata_port *ap);
static int mv_stop_edma_engine(void __iomem *port_mmio);
static void mv_edma_cfg(struct ata_port *ap, int want_ncq);

static void mv_pmp_select(struct ata_port *ap, int pmp);
static int mv_pmp_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
static int mv_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);

/* .sg_tablesize is (MV_MAX_SG_CT / 2) in the structures below
* because we have to allow room for worst case splitting of
* PRDs for 64K boundaries in mv_fill_sg().
Expand Down Expand Up @@ -566,14 +572,20 @@ static struct ata_port_operations mv5_ops = {

static struct ata_port_operations mv6_ops = {
.inherits = &mv5_ops,
.qc_defer = ata_std_qc_defer,
.qc_defer = sata_pmp_qc_defer_cmd_switch,
.dev_config = mv6_dev_config,
.scr_read = mv_scr_read,
.scr_write = mv_scr_write,

.pmp_hardreset = mv_pmp_hardreset,
.pmp_softreset = mv_softreset,
.softreset = mv_softreset,
.error_handler = sata_pmp_error_handler,
};

static struct ata_port_operations mv_iie_ops = {
.inherits = &mv6_ops,
.qc_defer = ata_std_qc_defer, /* FIS-based switching */
.dev_config = ATA_OP_NULL,
.qc_prep = mv_qc_prep_iie,
};
Expand All @@ -599,34 +611,39 @@ static const struct ata_port_info mv_port_info[] = {
},
{ /* chip_604x */
.flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
ATA_FLAG_PMP | ATA_FLAG_ACPI_SATA |
ATA_FLAG_NCQ,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = ATA_UDMA6,
.port_ops = &mv6_ops,
},
{ /* chip_608x */
.flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
ATA_FLAG_PMP | ATA_FLAG_ACPI_SATA |
ATA_FLAG_NCQ | MV_FLAG_DUAL_HC,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = ATA_UDMA6,
.port_ops = &mv6_ops,
},
{ /* chip_6042 */
.flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
ATA_FLAG_PMP | ATA_FLAG_ACPI_SATA |
ATA_FLAG_NCQ,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = ATA_UDMA6,
.port_ops = &mv_iie_ops,
},
{ /* chip_7042 */
.flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
ATA_FLAG_PMP | ATA_FLAG_ACPI_SATA |
ATA_FLAG_NCQ,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = ATA_UDMA6,
.port_ops = &mv_iie_ops,
},
{ /* chip_soc */
.flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
ATA_FLAG_PMP | ATA_FLAG_ACPI_SATA |
ATA_FLAG_NCQ | MV_FLAG_SOC,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = ATA_UDMA6,
Expand Down Expand Up @@ -1006,12 +1023,42 @@ static int mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
static void mv6_dev_config(struct ata_device *adev)
{
/*
* Deal with Gen-II ("mv6") hardware quirks/restrictions:
*
* Gen-II does not support NCQ over a port multiplier
* (no FIS-based switching).
*
* We don't have hob_nsect when doing NCQ commands on Gen-II.
* See mv_qc_prep() for more info.
*/
if (adev->flags & ATA_DFLAG_NCQ)
if (adev->max_sectors > ATA_MAX_SECTORS)
if (adev->flags & ATA_DFLAG_NCQ) {
if (sata_pmp_attached(adev->link->ap))
adev->flags &= ~ATA_DFLAG_NCQ;
else if (adev->max_sectors > ATA_MAX_SECTORS)
adev->max_sectors = ATA_MAX_SECTORS;
}
}

static void mv_config_fbs(void __iomem *port_mmio, int enable_fbs)
{
u32 old_fcfg, new_fcfg, old_ltmode, new_ltmode;
/*
* Various bit settings required for operation
* in FIS-based switching (fbs) mode on GenIIe:
*/
old_fcfg = readl(port_mmio + FIS_CFG_OFS);
old_ltmode = readl(port_mmio + LTMODE_OFS);
if (enable_fbs) {
new_fcfg = old_fcfg | FIS_CFG_SINGLE_SYNC;
new_ltmode = old_ltmode | LTMODE_BIT8;
} else { /* disable fbs */
new_fcfg = old_fcfg & ~FIS_CFG_SINGLE_SYNC;
new_ltmode = old_ltmode & ~LTMODE_BIT8;
}
if (new_fcfg != old_fcfg)
writelfl(new_fcfg, port_mmio + FIS_CFG_OFS);
if (new_ltmode != old_ltmode)
writelfl(new_ltmode, port_mmio + LTMODE_OFS);
}

static void mv_edma_cfg(struct ata_port *ap, int want_ncq)
Expand All @@ -1035,6 +1082,13 @@ static void mv_edma_cfg(struct ata_port *ap, int want_ncq)
cfg |= (1 << 22); /* enab 4-entry host queue cache */
cfg |= (1 << 18); /* enab early completion */
cfg |= (1 << 17); /* enab cut-through (dis stor&forwrd) */

if (want_ncq && sata_pmp_attached(ap)) {
cfg |= EDMA_CFG_EDMA_FBS; /* FIS-based switching */
mv_config_fbs(port_mmio, 1);
} else {
mv_config_fbs(port_mmio, 0);
}
}

if (want_ncq) {
Expand Down Expand Up @@ -1240,6 +1294,7 @@ static void mv_qc_prep(struct ata_queued_cmd *qc)
flags |= CRQB_FLAG_READ;
WARN_ON(MV_MAX_Q_DEPTH <= qc->tag);
flags |= qc->tag << CRQB_TAG_SHIFT;
flags |= (qc->dev->link->pmp & 0xf) << CRQB_PMP_SHIFT;

/* get current queue index from software */
in_index = pp->req_idx & MV_MAX_Q_DEPTH_MASK;
Expand Down Expand Up @@ -1331,6 +1386,7 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
WARN_ON(MV_MAX_Q_DEPTH <= qc->tag);
flags |= qc->tag << CRQB_TAG_SHIFT;
flags |= qc->tag << CRQB_HOSTQ_SHIFT;
flags |= (qc->dev->link->pmp & 0xf) << CRQB_PMP_SHIFT;

/* get current queue index from software */
in_index = pp->req_idx & MV_MAX_Q_DEPTH_MASK;
Expand Down Expand Up @@ -1394,6 +1450,7 @@ static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
* shadow block, etc registers.
*/
mv_stop_edma(ap);
mv_pmp_select(ap, qc->dev->link->pmp);
return ata_sff_qc_issue(qc);
}

Expand Down Expand Up @@ -2289,6 +2346,34 @@ static void mv_reset_channel(struct mv_host_priv *hpriv, void __iomem *mmio,
mdelay(1);
}

static void mv_pmp_select(struct ata_port *ap, int pmp)
{
if (sata_pmp_supported(ap)) {
void __iomem *port_mmio = mv_ap_base(ap);
u32 reg = readl(port_mmio + SATA_IFCTL_OFS);
int old = reg & 0xf;

if (old != pmp) {
reg = (reg & ~0xf) | pmp;
writelfl(reg, port_mmio + SATA_IFCTL_OFS);
}
}
}

static int mv_pmp_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
mv_pmp_select(link->ap, sata_srst_pmp(link));
return sata_std_hardreset(link, class, deadline);
}

static int mv_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
mv_pmp_select(link->ap, sata_srst_pmp(link));
return ata_sff_softreset(link, class, deadline);
}

static int mv_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
Expand Down

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