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ide: add short cables support

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This patch allows users to override both host and device side cable detection
with "ideX=ata66" kernel parameter.  Thanks to this it should be now possible
to use UDMA > 2 modes on systems (laptops mainly) which use short 40-pin cable
instead of 80-pin one.

Next patches add automatic detection of some systems using short cables.

Changes:

* Rename hwif->udma_four to hwif->cbl and make it u8.

* Convert all existing users accordingly (use ATA_CBL_* defines while at it).  

* Add ATA_CBL_PATA40_SHORT support to ide-iops.c:eighty_ninty_three().

* Use ATA_CBL_PATA40_SHORT for "ideX=ata66" kernel parameter.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Reviewed-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2007-07-09 23:17:58 +02:00
parent 75b1d97535
commit 49521f97cc
25 changed files with 124 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/ide/pci/piix.c
View File

@@ -394,14 +394,14 @@ static void piix_dma_clear_irq(ide_drive_t *drive)
hwif->OUTB(dma_stat, hwif->dma_status);
}
static int __devinit piix_cable_detect(ide_hwif_t *hwif)
static u8 __devinit piix_cable_detect(ide_hwif_t *hwif)
{
struct pci_dev *dev = hwif->pci_dev;
u8 reg54h = 0, mask = hwif->channel ? 0xc0 : 0x30;
pci_read_config_byte(dev, 0x54, &reg54h);
return (reg54h & mask) ? 1 : 0;
return (reg54h & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
}
/**
@@ -444,8 +444,8 @@ static void __devinit init_hwif_piix(ide_hwif_t *hwif)
hwif->swdma_mask = 0x04;
if (hwif->ultra_mask & 0x78) {
if (!hwif->udma_four)
hwif->udma_four = piix_cable_detect(hwif);
if (hwif->cbl != ATA_CBL_PATA40_SHORT)
hwif->cbl = piix_cable_detect(hwif);
}
if (no_piix_dma)