libata: clean up xfermode / PATA timing related stuff
* s/ATA_BITS_(PIO|MWDMA|UDMA)/ATA_NR_\1_MODES/g
* Consistently use 0xff to indicate invalid transfer mode (0x00 is
valid for PIO_SLOW).
* Make ata_xfer_mode2mask() return proper mode mask instead of just
the highest bit.
* Sort ata_timing table in increasing xfermode order and update
ata_timing_find_mode() accordingly.
This patch doesn't introduce any behavior change.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index a2f2ff8..a70ed7b 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -487,9 +487,9 @@
int shift, bits;
u8 base;
} ata_xfer_tbl[] = {
- { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
- { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
- { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
+ { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
+ { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
+ { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
{ -1, },
};
@@ -504,7 +504,7 @@
* None.
*
* RETURNS:
- * Matching XFER_* value, 0 if no match found.
+ * Matching XFER_* value, 0xff if no match found.
*/
u8 ata_xfer_mask2mode(unsigned int xfer_mask)
{
@@ -514,7 +514,7 @@
for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
return ent->base + highbit - ent->shift;
- return 0;
+ return 0xff;
}
/**
@@ -535,7 +535,8 @@
for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
- return 1 << (ent->shift + xfer_mode - ent->base);
+ return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
+ & ~((1 << ent->shift) - 1);
return 0;
}
@@ -1314,7 +1315,7 @@
/* Select the mode in use */
mode = ata_xfer_mask2mode(mask);
- if (mode != 0) {
+ if (mode != 0xff) {
ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
ata_mode_string(mask));
} else {
@@ -2788,38 +2789,33 @@
*/
static const struct ata_timing ata_timing[] = {
+/* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
+ { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
+ { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
+ { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
+ { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
+ { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
+ { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
+ { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
- { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
- { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
- { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
- { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
+ { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
+ { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
+ { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
- { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
+ { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
+ { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
+ { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
{ XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
- { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
- { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
- { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
+ { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
/* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
-
- { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
- { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
- { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
-
- { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
- { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
- { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
-
- { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
- { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
- { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
- { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
-
- { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
- { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
- { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
-
-/* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
+ { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
+ { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
+ { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
+ { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
+ { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
+ { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
+ { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
{ 0xFF }
};
@@ -2854,12 +2850,14 @@
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
{
- const struct ata_timing *t;
+ const struct ata_timing *t = ata_timing;
- for (t = ata_timing; t->mode != xfer_mode; t++)
- if (t->mode == 0xFF)
- return NULL;
- return t;
+ while (xfer_mode > t->mode)
+ t++;
+
+ if (xfer_mode == t->mode)
+ return t;
+ return NULL;
}
int ata_timing_compute(struct ata_device *adev, unsigned short speed,
@@ -3122,7 +3120,7 @@
dev->dma_mode = ata_xfer_mask2mode(dma_mask);
found = 1;
- if (dev->dma_mode)
+ if (dev->dma_mode != 0xff)
used_dma = 1;
}
if (!found)
@@ -3133,7 +3131,7 @@
if (!ata_dev_enabled(dev))
continue;
- if (!dev->pio_mode) {
+ if (dev->pio_mode == 0xff) {
ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
rc = -EINVAL;
goto out;
@@ -3147,7 +3145,7 @@
/* step 3: set host DMA timings */
ata_link_for_each_dev(dev, link) {
- if (!ata_dev_enabled(dev) || !dev->dma_mode)
+ if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff)
continue;
dev->xfer_mode = dev->dma_mode;