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>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index 5e3077409457..e46f47206542 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -942,8 +942,8 @@ pmac_ide_tune_chipset (ide_drive_t *drive, byte speed)
                                 return 1;
                 case XFER_UDMA_4:
                 case XFER_UDMA_3:
-                        if (HWIF(drive)->udma_four == 0)
-                                return 1;               
+                        if (drive->hwif->cbl != ATA_CBL_PATA80)
+                                return 1;
                 case XFER_UDMA_2:
                 case XFER_UDMA_1:
                 case XFER_UDMA_0:
@@ -1244,7 +1244,7 @@ pmac_ide_setup_device(pmac_ide_hwif_t *pmif, ide_hwif_t *hwif)
         hwif->chipset = ide_pmac;
         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET] || pmif->mediabay;
         hwif->hold = pmif->mediabay;
-        hwif->udma_four = pmif->cable_80;
+        hwif->cbl = pmif->cable_80 ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
         hwif->drives[0].unmask = 1;
         hwif->drives[1].unmask = 1;
         hwif->tuneproc = pmac_ide_tuneproc;