mmc: support the DDR mode for eMMC

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Lukasz Majewski <l.majewski@samsung.com>
Acked-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index dd6a6ef57cea363eb180555bd55aa756b7289123..08187d5f3ead245d7327fe3522758d32fad1bec2 100644 (file)
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -158,6 +158,9 @@ 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;
@@ -514,10 +517,13 @@ 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;
 }
@@ -1054,6 +1060,8 @@ 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,
@@ -1061,13 +1069,15 @@ 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 d5a896fbb134f59b2fa040b43ce538128d7b3094..aa2d1ca3605a4be3a601bc91a577407d8a17d383 100644 (file)
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -38,6 +38,7 @@
 #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
 
@@ -169,10 +170,16 @@
 
 #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)