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pata_sis: enable MWDMA for UDMA 133 chipset 

This ports the timing values over from the old IDE driver into the new
PATA-based one. The comment was lying when it stated the old driver was
not MWDMA capable.

Boot tested on actual hardware using 'libata.force=mwdma2'.

Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Dan McGee 2011-09-07 11:23:20 -05:00 committed by Jeff Garzik
parent f30f9a5e7b
commit 14004f044b
1 changed files with 17 additions and 8 deletions
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25
drivers/ata/pata_sis.c
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@ -485,21 +485,30 @@ static void sis_133_set_dmamode (struct ata_port *ap, struct ata_device *adev)
int port;
u32 t1;
/* bits 4- cycle time 8 - cvs time */
static const u32 timing_u100[] = { 0x6B0, 0x470, 0x350, 0x140, 0x120, 0x110, 0x000 };
static const u32 timing_u133[] = { 0x9F0, 0x6A0, 0x470, 0x250, 0x230, 0x220, 0x210 };
port = sis_port_base(adev);
pci_read_config_dword(pdev, port, &t1);
if (adev->dma_mode < XFER_UDMA_0) {
/* Recovery << 24 | Act << 16 | Ini << 12, like PIO modes */
static const u32 timing_u100[] = { 0x19154000, 0x06072000, 0x04062000 };
static const u32 timing_u133[] = { 0x221C6000, 0x0C0A3000, 0x05093000 };
int speed = adev->dma_mode - XFER_MW_DMA_0;
t1 &= 0xC0C00FFF;
/* disable UDMA */
t1 &= ~0x00000004;
/* FIXME: need data sheet to add MWDMA here. Also lacking on
ide/pci driver */
if (t1 & 0x08)
t1 |= timing_u133[speed];
else
t1 |= timing_u100[speed];
} else {
/* bits 4- cycle time 8 - cvs time */
static const u32 timing_u100[] = { 0x6B0, 0x470, 0x350, 0x140, 0x120, 0x110, 0x000 };
static const u32 timing_u133[] = { 0x9F0, 0x6A0, 0x470, 0x250, 0x230, 0x220, 0x210 };
int speed = adev->dma_mode - XFER_UDMA_0;
/* if & 8 no UDMA133 - need info for ... */
t1 &= ~0x00000FF0;
/* enable UDMA */
t1 |= 0x00000004;
if (t1 & 0x08)
t1 |= timing_u133[speed];
@ -620,7 +629,7 @@ static const struct ata_port_info sis_info100_early = {
static const struct ata_port_info sis_info133 = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
/* No MWDMA */
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &sis_133_ops,
};