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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-07-09 23:17:58 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-07-09 23:17:58 +0200
commit49521f97ccd3c2bf6e71a91cea8fe65d170fa4fb (patch)
treef61c34da6092f2f1a97a78da567afc59ad40850b /drivers/ide/pci/pdc202xx_old.c
parent75b1d97535327d0428c6bffd9d5407e65546fd5d (diff)
ide: add short cables support
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>
Diffstat (limited to 'drivers/ide/pci/pdc202xx_old.c')
-rw-r--r--drivers/ide/pci/pdc202xx_old.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/ide/pci/pdc202xx_old.c b/drivers/ide/pci/pdc202xx_old.c
index ae628b86e18..41ac4a94959 100644
--- a/drivers/ide/pci/pdc202xx_old.c
+++ b/drivers/ide/pci/pdc202xx_old.c
@@ -152,8 +152,10 @@ static void pdc202xx_tune_drive(ide_drive_t *drive, u8 pio)
static u8 pdc202xx_old_cable_detect (ide_hwif_t *hwif)
{
u16 CIS = 0, mask = (hwif->channel) ? (1<<11) : (1<<10);
+
pci_read_config_word(hwif->pci_dev, 0x50, &CIS);
- return (CIS & mask) ? 1 : 0;
+
+ return (CIS & mask) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
}
/*
@@ -357,8 +359,9 @@ static void __devinit init_hwif_pdc202xx(ide_hwif_t *hwif)
hwif->dma_timeout = &pdc202xx_dma_timeout;
if (hwif->pci_dev->device != PCI_DEVICE_ID_PROMISE_20246) {
- if (!(hwif->udma_four))
- hwif->udma_four = (pdc202xx_old_cable_detect(hwif)) ? 0 : 1;
+ if (hwif->cbl != ATA_CBL_PATA40_SHORT)
+ hwif->cbl = pdc202xx_old_cable_detect(hwif);
+
hwif->dma_start = &pdc202xx_old_ide_dma_start;
hwif->ide_dma_end = &pdc202xx_old_ide_dma_end;
}