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>
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 7bd4923..8ce0827 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -48,6 +48,7 @@
unsigned int sa_timeout; /* Units: 100ns */
unsigned int hs_max_dtr;
unsigned int sectors;
+ unsigned int card_type;
unsigned int hc_erase_size; /* In sectors */
unsigned int hc_erase_timeout; /* In milliseconds */
unsigned int sec_trim_mult; /* Secure trim multiplier */
@@ -113,6 +114,7 @@
#define MMC_STATE_READONLY (1<<1) /* card is read-only */
#define MMC_STATE_HIGHSPEED (1<<2) /* card is in high speed mode */
#define MMC_STATE_BLOCKADDR (1<<3) /* card uses block-addressing */
+#define MMC_STATE_HIGHSPEED_DDR (1<<4) /* card is in high speed mode */
unsigned int quirks; /* card quirks */
#define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes outside of the VS CCCR range */
#define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func->cur_blksize */
@@ -154,11 +156,13 @@
#define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY)
#define mmc_card_highspeed(c) ((c)->state & MMC_STATE_HIGHSPEED)
#define mmc_card_blockaddr(c) ((c)->state & MMC_STATE_BLOCKADDR)
+#define mmc_card_ddr_mode(c) ((c)->state & MMC_STATE_HIGHSPEED_DDR)
#define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
#define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
#define mmc_card_set_highspeed(c) ((c)->state |= MMC_STATE_HIGHSPEED)
#define mmc_card_set_blockaddr(c) ((c)->state |= MMC_STATE_BLOCKADDR)
+#define mmc_card_set_ddr_mode(c) ((c)->state |= MMC_STATE_HIGHSPEED_DDR)
static inline int mmc_card_lenient_fn0(const struct mmc_card *c)
{
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 7429033..d0fbcac 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -109,6 +109,7 @@
#define MMC_DATA_WRITE (1 << 8)
#define MMC_DATA_READ (1 << 9)
#define MMC_DATA_STREAM (1 << 10)
+#define MMC_DDR_MODE (1 << 11)
unsigned int bytes_xfered;
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index ccac56a..6711eb8 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -158,6 +158,10 @@
#define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */
#define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */
#define MMC_CAP_ERASE (1 << 10) /* Allow erase/trim commands */
+#define MMC_CAP_1_8V_DDR (1 << 11) /* can support */
+ /* DDR mode at 1.8V */
+#define MMC_CAP_1_2V_DDR (1 << 12) /* can support */
+ /* DDR mode at 1.2V */
mmc_pm_flag_t pm_caps; /* supported pm features */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index dd11ae5..956fbd87 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -277,11 +277,19 @@
#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)