mmc: MMC 4.4 DDR support

Add support for Dual Data Rate MMC cards as defined in the 4.4
specification.

Signed-off-by: Hanumath Prasad <hanumath.prasad@stericsson.com>
Cc: linux-mmc@vger.kernel.org
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Tested-by Zhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index dd11ae51fb68..956fbd877692 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -277,11 +277,19 @@ struct _mmc_csd {
 
 #define EXT_CSD_CARD_TYPE_26    (1<<0)  /* Card can run at 26MHz */
 #define EXT_CSD_CARD_TYPE_52    (1<<1)  /* Card can run at 52MHz */
-#define EXT_CSD_CARD_TYPE_MASK  0x3     /* Mask out reserved and DDR bits */
+#define EXT_CSD_CARD_TYPE_MASK  0xF     /* Mask out reserved bits */
+#define EXT_CSD_CARD_TYPE_DDR_1_8V  (1<<2)   /* Card can run at 52MHz */
+                                             /* DDR mode @1.8V or 3V I/O */
+#define EXT_CSD_CARD_TYPE_DDR_1_2V  (1<<3)   /* Card can run at 52MHz */
+                                             /* DDR mode @1.2V I/O */
+#define EXT_CSD_CARD_TYPE_DDR_52       (EXT_CSD_CARD_TYPE_DDR_1_8V  \
+                                        | EXT_CSD_CARD_TYPE_DDR_1_2V)
 
 #define EXT_CSD_BUS_WIDTH_1     0       /* Card is in 1 bit mode */
 #define EXT_CSD_BUS_WIDTH_4     1       /* Card is in 4 bit mode */
 #define EXT_CSD_BUS_WIDTH_8     2       /* Card is in 8 bit mode */
+#define EXT_CSD_DDR_BUS_WIDTH_4 5       /* Card is in 4 bit DDR mode */
+#define EXT_CSD_DDR_BUS_WIDTH_8 6       /* Card is in 8 bit DDR mode */
 
 #define EXT_CSD_SEC_ER_EN       BIT(0)
 #define EXT_CSD_SEC_BD_BLK_EN   BIT(2)