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Commit 208a08f7 authored by Kumar Gala's avatar Kumar Gala Committed by Linus Torvalds
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[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: default avatarKumar Gala <galak@kernel.crashing.org>
Acked-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent f751d50f

drivers/ide/ide-disk.c

+0 −2
Original line number Diff line number Diff line
@@ -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;

drivers/ide/ide-probe.c

+9 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/ide.h

+1 −0
Original line number Diff line number Diff line
@@ -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() */