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[PATCH] sd: SD 4-bit bus

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Infrastructure for 4-bit bus transfers with SD cards.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Pierre Ossman 2005-09-06 15:18:55 -07:00 • committed by Linus Torvalds
parent a9c4342beb
commit f218278a45
3 changed files with 52 additions and 0 deletions
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9
include/linux/mmc/host.h
View file

@ -57,6 +57,11 @@ struct mmc_ios {
#define MMC_POWER_OFF 0
#define MMC_POWER_UP 1
#define MMC_POWER_ON 2
unsigned char bus_width; /* data bus width */
#define MMC_BUS_WIDTH_1 0
#define MMC_BUS_WIDTH_4 2
};
struct mmc_host_ops {
@ -77,6 +82,10 @@ struct mmc_host {
unsigned int f_max;
u32 ocr_avail;
unsigned long caps; /* Host capabilities */
#define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */
/* host specific block data */
unsigned int max_seg_size; /* see blk_queue_max_segment_size */
unsigned short max_hw_segs; /* see blk_queue_max_hw_segments */

7
include/linux/mmc/protocol.h
View file

@ -236,5 +236,12 @@ struct _mmc_csd {
#define CSD_SPEC_VER_2 2 /* Implements system specification 2.0 - 2.2 */
#define CSD_SPEC_VER_3 3 /* Implements system specification 3.1 */
/*
* SD bus widths
*/
#define SD_BUS_WIDTH_1 0
#define SD_BUS_WIDTH_4 2
#endif /* MMC_MMC_PROTOCOL_H */