[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>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 427d1c204174..1b7b4c531bc2 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);