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authorPierre Ossman <drzeus-list@drzeus.cx>2005-09-07 02:18:55 +0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-08 03:57:51 +0400
commitf218278a456b3c272b480443c89004c3d2a49f18 (patch)
tree8d9558816488311e06a7ad2434e342418f2c79d5 /include
parenta9c4342beb4cd28b3a05c3401195e2536c37c150 (diff)
downloadlinux-f218278a456b3c272b480443c89004c3d2a49f18.tar.xz
[PATCH] sd: SD 4-bit bus
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmc/host.h9
-rw-r--r--include/linux/mmc/protocol.h7
2 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 8c5f71376e41..6014160d9c06 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -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 */
diff --git a/include/linux/mmc/protocol.h b/include/linux/mmc/protocol.h
index 896342817b97..f819cae92266 100644
--- a/include/linux/mmc/protocol.h
+++ b/include/linux/mmc/protocol.h
@@ -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 */