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authorGrazvydas Ignotas <notasas@gmail.com>2010-05-26 17:42:09 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-27 12:12:40 -0400
commit6c1f716e8154ee9315534782b9b1eedea0559a24 (patch)
treea30bf84dddede683fee5a46d2468b8f02e67a0cb /include/linux
parent1a13f8fa76c880be41d6b1e6a2b44404bcbfdf9e (diff)
sdio: add new function for RAW (Read after Write) operation
SDIO specification allows RAW (Read after Write) operation using IO_RW_DIRECT command (CMD52) by setting the RAW bit. This operation is similar to ordinary read/write commands, except that both write and read are performed using single command/response pair. The Linux SDIO layer already supports this internaly, only external function is missing for drivers to make use, which is added by this patch. This type of command is required to implement proper power save mode support in wl1251 wifi driver. Android has similar patch for G1 in it's tree for the same reason: http://android.git.kernel.org/?p=kernel/common.git;a=commitdiff;h=74a47786f6ecbe6c1cf9fb15efe6a968451deb52 Signed-off-by: Grazvydas Ignotas <notasas@gmail.com> Acked-by: Kalle Valo <kalle.valo@iki.fi> Cc: Dmitry Shmidt <dimitrysh@google.com> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/mmc/sdio_func.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mmc/sdio_func.h b/include/linux/mmc/sdio_func.h
index c6c0cceba5fe..31baaf82f458 100644
--- a/include/linux/mmc/sdio_func.h
+++ b/include/linux/mmc/sdio_func.h
@@ -145,6 +145,9 @@ extern void sdio_writew(struct sdio_func *func, u16 b,
145extern void sdio_writel(struct sdio_func *func, u32 b, 145extern void sdio_writel(struct sdio_func *func, u32 b,
146 unsigned int addr, int *err_ret); 146 unsigned int addr, int *err_ret);
147 147
148extern u8 sdio_writeb_readb(struct sdio_func *func, u8 write_byte,
149 unsigned int addr, int *err_ret);
150
148extern int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr, 151extern int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
149 void *src, int count); 152 void *src, int count);
150extern int sdio_writesb(struct sdio_func *func, unsigned int addr, 153extern int sdio_writesb(struct sdio_func *func, unsigned int addr,