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authorKumar Gala <galak@kernel.crashing.org>2006-03-24 03:18:21 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-24 07:33:28 -0800
commit208a08f7cc2a8932ed76162d9844f9ae7d7fc015 (patch)
tree6f0eb837cf8c1ce131c93ecf52476046519c5969
parentf751d50f6dea1446797c9a31f5c183002e5780a8 (diff)
[PATCH] ide: Allow IDE interface to specify its not capable of 32-bit operations
In some embedded systems the IDE hardware interface may only support 16-bit or smaller accesses. Allow the interface to specify if this is the case and don't allow the drive or user to override the setting. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/ide/ide-disk.c2
-rw-r--r--drivers/ide/ide-probe.c9
-rw-r--r--include/linux/ide.h1
3 files changed, 10 insertions, 2 deletions
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index e238b7da824..ccf528d733b 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -978,8 +978,6 @@ static void idedisk_setup (ide_drive_t *drive)
ide_dma_verbose(drive);
printk("\n");
- drive->no_io_32bit = id->dword_io ? 1 : 0;
-
/* write cache enabled? */
if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
drive->wcache = 1;
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 427d1c20417..1b7b4c531bc 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -858,6 +858,15 @@ static void probe_hwif(ide_hwif_t *hwif)
}
}
}
+
+ for (unit = 0; unit < MAX_DRIVES; ++unit) {
+ ide_drive_t *drive = &hwif->drives[unit];
+
+ if (hwif->no_io_32bit)
+ drive->no_io_32bit = 1;
+ else
+ drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
+ }
}
static int hwif_init(ide_hwif_t *hwif);
diff --git a/include/linux/ide.h b/include/linux/ide.h
index a7fc4cc79b2..8d2db412ba9 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -792,6 +792,7 @@ typedef struct hwif_s {
unsigned no_dsc : 1; /* 0 default, 1 dsc_overlap disabled */
unsigned auto_poll : 1; /* supports nop auto-poll */
unsigned sg_mapped : 1; /* sg_table and sg_nents are ready */
+ unsigned no_io_32bit : 1; /* 1 = can not do 32-bit IO ops */
struct device gendev;
struct completion gendev_rel_comp; /* To deal with device release() */