libata-acpi is using separate timing tables for transfer modes
although libata-core has the complete ata_timing table. Implement
ata_timing_cycle2mode() to look for matching mode given transfer type
and cycle duration and use it in libata-acpi and pata_acpi to replace
private timing tables.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
---
drivers/ata/libata-acpi.c | 62 +++++++++++----------------------------------
drivers/ata/libata-core.c | 52 +++++++++++++++++++++++++++++++++++++
drivers/ata/pata_acpi.c | 13 +++++----
include/linux/libata.h | 5 +---
4 files changed, 75 insertions(+), 57 deletions(-)
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 9f0b208..a6f1a6b 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -441,22 +441,6 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
return rc;
}
-/* Welcome to ACPI, bring a bucket */
-const unsigned int ata_acpi_pio_cycle[7] = {
- 600, 383, 240, 180, 120, 100, 80
-};
-EXPORT_SYMBOL_GPL(ata_acpi_pio_cycle);
-
-const unsigned int ata_acpi_mwdma_cycle[5] = {
- 480, 150, 120, 100, 80
-};
-EXPORT_SYMBOL_GPL(ata_acpi_mwdma_cycle);
-
-const unsigned int ata_acpi_udma_cycle[7] = {
- 120, 80, 60, 45, 30, 20, 15
-};
-EXPORT_SYMBOL_GPL(ata_acpi_udma_cycle);
-
/**
* ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
* @dev: target device
@@ -473,49 +457,33 @@ EXPORT_SYMBOL_GPL(ata_acpi_udma_cycle);
unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
const struct ata_acpi_gtm *gtm)
{
- unsigned long pio_mask = 0, mwdma_mask = 0, udma_mask = 0;
- int unit, i;
- u32 t;
+ unsigned long xfer_mask = 0;
+ unsigned int type;
+ int unit;
+ u8 mode;
/* we always use the 0 slot for crap hardware */
unit = dev->devno;
if (!(gtm->flags & 0x10))
unit = 0;
- /* Values larger than the longest cycle results in 0 mask
- * while values equal to smaller than the shortest cycle
- * results in mask which includes all supported modes.
- * Disabled transfer method has the value of 0xffffffff which
- * will always result in 0 mask.
- */
-
- /* start by scanning for PIO modes */
- t = gtm->drive[unit].pio;
- for (i = 0; i < ARRAY_SIZE(ata_acpi_pio_cycle); i++)
- if (t > ata_acpi_pio_cycle[i])
- break;
- pio_mask = (1 << i) - 1;
+ /* PIO */
+ mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
+ xfer_mask |= ata_xfer_mode2mask(mode);
/* See if we have MWDMA or UDMA data. We don't bother with
* MWDMA if UDMA is available as this means the BIOS set UDMA
* and our error changedown if it works is UDMA to PIO anyway.
*/
- t = gtm->drive[unit].dma;
- if (!(gtm->flags & (1 << (2 * unit)))) {
- /* MWDMA */
- for (i = 0; i < ARRAY_SIZE(ata_acpi_mwdma_cycle); i++)
- if (t > ata_acpi_mwdma_cycle[i])
- break;
- mwdma_mask = (1 << i) - 1;
- } else {
- /* UDMA */
- for (i = 0; i < ARRAY_SIZE(ata_acpi_udma_cycle); i++)
- if (t > ata_acpi_udma_cycle[i])
- break;
- udma_mask = (1 << i) - 1;
- }
+ if (!(gtm->flags & (1 << (2 * unit))))
+ type = ATA_SHIFT_MWDMA;
+ else
+ type = ATA_SHIFT_UDMA;
+
+ mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
+ xfer_mask |= ata_xfer_mode2mask(mode);
- return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
+ return xfer_mask;
}
EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 77974ca..9804127 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2903,6 +2903,57 @@ int ata_timing_compute(struct ata_device *adev, unsigned short speed,
}
/**
+ * ata_timing_cycle2mode - find xfer mode for the specified cycle duration
+ * @xfer_shift: ATA_SHIFT_* value for transfer type to examine.
+ * @cycle: cycle duration in ns
+ *
+ * Return matching xfer mode for @cycle. The returned mode is of
+ * the transfer type specified by @xfer_shift. If @cycle is too
+ * slow for @xfer_shift, 0xff is returned. If @cycle is faster
+ * than the fastest known mode, the fasted mode is returned.
+ *
+ * LOCKING:
+ * None.
+ *
+ * RETURNS:
+ * Matching xfer_mode, 0xff if no match found.
+ */
+u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
+{
+ u8 base_mode = 0xff, last_mode = 0xff;
+ const struct ata_xfer_ent *ent;
+ const struct ata_timing *t;
+
+ for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
+ if (ent->shift == xfer_shift)
+ base_mode = ent->base;
+
+ for (t = ata_timing_find_mode(base_mode);
+ t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
+ unsigned short this_cycle;
+
+ switch (xfer_shift) {
+ case ATA_SHIFT_PIO:
+ case ATA_SHIFT_MWDMA:
+ this_cycle = t->cycle;
+ break;
+ case ATA_SHIFT_UDMA:
+ this_cycle = t->udma;
+ break;
+ default:
+ return 0xff;
+ }
+
+ if (cycle > this_cycle)
+ break;
+
+ last_mode = t->mode;
+ }
+
+ return last_mode;
+}
+
+/**
* ata_down_xfermask_limit - adjust dev xfer masks downward
* @dev: Device to adjust xfer masks
* @sel: ATA_DNXFER_* selector
@@ -7628,6 +7679,7 @@ EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
+EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
diff --git a/drivers/ata/pata_acpi.c b/drivers/ata/pata_acpi.c
index a4737a3..244098a 100644
--- a/drivers/ata/pata_acpi.c
+++ b/drivers/ata/pata_acpi.c
@@ -133,13 +133,14 @@ static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
int unit = adev->devno;
struct pata_acpi *acpi = ap->private_data;
+ const struct ata_timing *t;
if (!(acpi->gtm.flags & 0x10))
unit = 0;
/* Now stuff the nS values into the structure */
- acpi->gtm.drive[unit].pio =
- ata_acpi_pio_cycle[adev->pio_mode - XFER_PIO_0];
+ t = ata_timing_find_mode(adev->pio_mode);
+ acpi->gtm.drive[unit].pio = t->cycle;
ata_acpi_stm(ap, &acpi->gtm);
/* See what mode we actually got */
ata_acpi_gtm(ap, &acpi->gtm);
@@ -155,18 +156,18 @@ static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
int unit = adev->devno;
struct pata_acpi *acpi = ap->private_data;
+ const struct ata_timing *t;
if (!(acpi->gtm.flags & 0x10))
unit = 0;
/* Now stuff the nS values into the structure */
+ t = ata_timing_find_mode(adev->dma_mode);
if (adev->dma_mode >= XFER_UDMA_0) {
- acpi->gtm.drive[unit].dma =
- ata_acpi_udma_cycle[adev->dma_mode - XFER_UDMA_0];
+ acpi->gtm.drive[unit].dma = t->udma;
acpi->gtm.flags |= (1 << (2 * unit));
} else {
- acpi->gtm.drive[unit].dma =
- ata_acpi_mwdma_cycle[adev->dma_mode - XFER_MW_DMA_0];
+ acpi->gtm.drive[unit].dma = t->cycle;
acpi->gtm.flags &= ~(1 << (2 * unit));
}
ata_acpi_stm(ap, &acpi->gtm);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 8022e5b..8ede93b 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -941,6 +941,7 @@ extern int ata_timing_compute(struct ata_device *, unsigned short,
extern void ata_timing_merge(const struct ata_timing *,
const struct ata_timing *, struct ata_timing *,
unsigned int);
+extern u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle);
enum {
ATA_TIMING_SETUP = (1 << 0),
@@ -961,10 +962,6 @@ enum {
/* libata-acpi.c */
#ifdef CONFIG_ATA_ACPI
-extern const unsigned int ata_acpi_pio_cycle[7];
-extern const unsigned int ata_acpi_mwdma_cycle[5];
-extern const unsigned int ata_acpi_udma_cycle[7];
-
static inline const struct ata_acpi_gtm *ata_acpi_init_gtm(struct ata_port *ap)
{
if (ap->pflags & ATA_PFLAG_INIT_GTM_VALID)
--
1.5.2.4
-
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