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[PATCH] ide: Allow IDE interface to specify its not capable of 32-bit operations

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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>
This commit is contained in:
Kumar Gala 2006-03-24 03:18:21 -08:00 committed by Linus Torvalds
parent f751d50f6d
commit 208a08f7cc
3 changed files with 10 additions and 2 deletions
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2
drivers/ide/ide-disk.c
View file

@ -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;

9
drivers/ide/ide-probe.c
View file

@ -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);

1
include/linux/ide.h
View file

@ -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() */