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, 2 insertions, 1 deletions

diff --git a/include/linux/ide.h b/include/linux/ide.h
index b6546f442fa4..19ab25804056 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -686,6 +686,8 @@ typedef struct hwif_s {
         u8 mwdma_mask;
         u8 swdma_mask;
 
+        u8 cbl;         /* cable type */
+
         hwif_chipset_t chipset; /* sub-module for tuning.. */
 
         struct pci_dev  *pci_dev;       /* for pci chipsets */
@@ -792,7 +794,6 @@ typedef struct hwif_s {
         unsigned        sharing_irq: 1; /* 1 = sharing irq with another hwif */
         unsigned        reset      : 1; /* reset after probe */
         unsigned        autodma    : 1; /* auto-attempt using DMA at boot */
-        unsigned        udma_four  : 1; /* 1=ATA-66 capable, 0=default */
         unsigned        no_lba48   : 1; /* 1 = cannot do LBA48 */
         unsigned        no_lba48_dma : 1; /* 1 = cannot do LBA48 DMA */
         unsigned        auto_poll  : 1; /* supports nop auto-poll */