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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
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4
drivers/ide/pci/tc86c001.c
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@@ -220,13 +220,13 @@ static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
hwif->ide_dma_check = &tc86c001_config_drive_xfer_rate;
hwif->dma_start = &tc86c001_dma_start;
if (!hwif->udma_four) {
if (hwif->cbl != ATA_CBL_PATA40_SHORT) {
/*
* System Control 1 Register bit 13 (PDIAGN):
* 0=80-pin cable, 1=40-pin cable
*/
scr1 = hwif->INW(sc_base + 0x00);
hwif->udma_four = (scr1 & 0x2000) ? 0 : 1;
hwif->cbl = (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
}
if (!noautodma)