Support the DDR mode.
Signed-off-by: Jaehoon Chung jh80.chung@samsung.com --- drivers/mmc/mmc.c | 15 ++++++++++++--- include/mmc.h | 7 +++++++ 2 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index bac07c2..2874780 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -163,6 +163,9 @@ int mmc_set_blocklen(struct mmc *mmc, int len) { struct mmc_cmd cmd;
+ if (mmc->card_caps & MMC_MODE_DDR_52MHz) + return 0; + cmd.cmdidx = MMC_CMD_SET_BLOCKLEN; cmd.resp_type = MMC_RSP_R1; cmd.cmdarg = len; @@ -518,9 +521,11 @@ static int mmc_change_freq(struct mmc *mmc) return 0;
/* High Speed is set, there are two types: 52MHz and 26MHz */ - if (cardtype & EXT_CSD_CARD_TYPE_52) + if (cardtype & EXT_CSD_CARD_TYPE_52) { + if (cardtype & EXT_CSD_CARD_TYPE_DDR_52) + mmc->card_caps |= MMC_MODE_DDR_52MHz; mmc->card_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS; - else + } else mmc->card_caps |= MMC_MODE_HS;
return 0; @@ -1057,6 +1062,8 @@ static int mmc_startup(struct mmc *mmc)
/* An array of possible bus widths in order of preference */ static unsigned ext_csd_bits[] = { + EXT_CSD_DDR_BUS_WIDTH_8, + EXT_CSD_DDR_BUS_WIDTH_4, EXT_CSD_BUS_WIDTH_8, EXT_CSD_BUS_WIDTH_4, EXT_CSD_BUS_WIDTH_1, @@ -1064,13 +1071,15 @@ static int mmc_startup(struct mmc *mmc)
/* An array to map CSD bus widths to host cap bits */ static unsigned ext_to_hostcaps[] = { + [EXT_CSD_DDR_BUS_WIDTH_4] = MMC_MODE_DDR_52MHz, + [EXT_CSD_DDR_BUS_WIDTH_8] = MMC_MODE_DDR_52MHz, [EXT_CSD_BUS_WIDTH_4] = MMC_MODE_4BIT, [EXT_CSD_BUS_WIDTH_8] = MMC_MODE_8BIT, };
/* An array to map chosen bus width to an integer */ static unsigned widths[] = { - 8, 4, 1, + 8, 4, 8, 4, 1, };
for (idx=0; idx < ARRAY_SIZE(ext_csd_bits); idx++) { diff --git a/include/mmc.h b/include/mmc.h index 6725ac8..5120d17 100644 --- a/include/mmc.h +++ b/include/mmc.h @@ -37,6 +37,7 @@ #define MMC_MODE_8BIT (1 << 3) #define MMC_MODE_SPI (1 << 4) #define MMC_MODE_HC (1 << 5) +#define MMC_MODE_DDR_52MHz (1 << 6)
#define SD_DATA_4BIT 0x00040000
@@ -167,10 +168,16 @@
#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_DDR_1_8V (1 << 2) +#define EXT_CSD_CARD_TYPE_DDR_1_2V (1 << 3) +#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_BOOT_ACK_ENABLE (1 << 6) #define EXT_CSD_BOOT_PARTITION_ENABLE (1 << 3)