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>
diff --git a/drivers/ide/pci/siimage.c b/drivers/ide/pci/siimage.c
index 1a4444e..1c3e354 100644
--- a/drivers/ide/pci/siimage.c
+++ b/drivers/ide/pci/siimage.c
@@ -933,16 +933,17 @@
* interface.
*/
-static unsigned int __devinit ata66_siimage(ide_hwif_t *hwif)
+static u8 __devinit ata66_siimage(ide_hwif_t *hwif)
{
unsigned long addr = siimage_selreg(hwif, 0);
- if (pci_get_drvdata(hwif->pci_dev) == NULL) {
- u8 ata66 = 0;
- pci_read_config_byte(hwif->pci_dev, addr, &ata66);
- return (ata66 & 0x01) ? 1 : 0;
- }
+ u8 ata66 = 0;
- return (hwif->INB(addr) & 0x01) ? 1 : 0;
+ if (pci_get_drvdata(hwif->pci_dev) == NULL)
+ pci_read_config_byte(hwif->pci_dev, addr, &ata66);
+ else
+ ata66 = hwif->INB(addr);
+
+ return (ata66 & 0x01) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
}
/**
@@ -988,8 +989,9 @@
hwif->atapi_dma = 1;
hwif->ide_dma_check = &siimage_config_drive_for_dma;
- if (!(hwif->udma_four))
- hwif->udma_four = ata66_siimage(hwif);
+
+ if (hwif->cbl != ATA_CBL_PATA40_SHORT)
+ hwif->cbl = ata66_siimage(hwif);
if (hwif->mmio) {
hwif->ide_dma_test_irq = &siimage_mmio_ide_dma_test_irq;