mmc: add HS200 support in MMC core

Add HS200 to the list of supported modes and introduce tuning in the MMC
startup process.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index b06e4bc..d59cce6 100644 (file)
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -621,6 +621,10 @@ static int mmc_set_card_speed(struct mmc *mmc, enum bus_mode mode)
        case MMC_HS_52:
        case MMC_DDR_52:
                speed_bits = EXT_CSD_TIMING_HS;
+               break;
+       case MMC_HS_200:
+               speed_bits = EXT_CSD_TIMING_HS200;
+               break;
        case MMC_LEGACY:
                speed_bits = EXT_CSD_TIMING_LEGACY;
                break;
@@ -667,9 +671,12 @@ static int mmc_get_capabilities(struct mmc *mmc)
 
        mmc->card_caps |= MMC_MODE_4BIT | MMC_MODE_8BIT;
 
-       cardtype = ext_csd[EXT_CSD_CARD_TYPE] & 0xf;
+       cardtype = ext_csd[EXT_CSD_CARD_TYPE] & 0x3f;
 
-       /* High Speed is set, there are two types: 52MHz and 26MHz */
+       if (cardtype & (EXT_CSD_CARD_TYPE_HS200_1_2V |
+                       EXT_CSD_CARD_TYPE_HS200_1_8V)) {
+               mmc->card_caps |= MMC_MODE_HS200;
+       }
        if (cardtype & EXT_CSD_CARD_TYPE_52) {
                if (cardtype & EXT_CSD_CARD_TYPE_DDR_52)
                        mmc->card_caps |= MMC_MODE_DDR_52MHz;
@@ -1268,6 +1275,7 @@ void mmc_dump_capabilities(const char *text, uint caps)
 struct mode_width_tuning {
        enum bus_mode mode;
        uint widths;
+       uint tuning;
 };
 
 static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage)
@@ -1383,6 +1391,7 @@ static const struct mode_width_tuning mmc_modes_by_pref[] = {
        {
                .mode = MMC_HS_200,
                .widths = MMC_MODE_8BIT | MMC_MODE_4BIT,
+               .tuning = MMC_CMD_SEND_TUNING_BLOCK_HS200
        },
        {
                .mode = MMC_DDR_52,
@@ -1484,6 +1493,15 @@ static int mmc_select_mode_and_width(struct mmc *mmc)
                        mmc_select_mode(mmc, mwt->mode);
                        mmc_set_clock(mmc, mmc->tran_speed, false);
 
+                       /* execute tuning if needed */
+                       if (mwt->tuning) {
+                               err = mmc_execute_tuning(mmc, mwt->tuning);
+                               if (err) {
+                                       debug("tuning failed\n");
+                                       goto error;
+                               }
+                       }
+
                        /* do a transfer to check the configuration */
                        err = mmc_read_and_compare_ext_csd(mmc);
                        if (!err)

diff --git a/include/mmc.h b/include/mmc.h
index 56fa869..407fddf 100644 (file)
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -56,6 +56,7 @@
 #define MMC_MODE_HS            (MMC_CAP(MMC_HS) | MMC_CAP(SD_HS))
 #define MMC_MODE_HS_52MHz      MMC_CAP(MMC_HS_52)
 #define MMC_MODE_DDR_52MHz     MMC_CAP(MMC_DDR_52)
+#define MMC_MODE_HS200         MMC_CAP(MMC_HS_200)
 
 #define MMC_MODE_8BIT          BIT(30)
 #define MMC_MODE_4BIT          BIT(29)
@@ -86,6 +87,7 @@
 #define MMC_CMD_SET_BLOCKLEN           16
 #define MMC_CMD_READ_SINGLE_BLOCK      17
 #define MMC_CMD_READ_MULTIPLE_BLOCK    18
+#define MMC_CMD_SEND_TUNING_BLOCK_HS200        21
 #define MMC_CMD_SET_BLOCK_COUNT         23
 #define MMC_CMD_WRITE_SINGLE_BLOCK     24
 #define MMC_CMD_WRITE_MULTIPLE_BLOCK   25
@@ -113,6 +115,13 @@
 #define SD_CMD_APP_SEND_OP_COND                41
 #define SD_CMD_APP_SEND_SCR            51
 
+static inline bool mmc_is_tuning_cmd(uint cmdidx)
+{
+       if (cmdidx == MMC_CMD_SEND_TUNING_BLOCK_HS200)
+               return true;
+       return false;
+}
+
 /* SCR definitions in different words */
 #define SD_HIGHSPEED_BUSY      0x00020000
 #define SD_HIGHSPEED_SUPPORTED 0x00020000
@@ -210,6 +219,13 @@
 #define EXT_CSD_CARD_TYPE_DDR_52       (EXT_CSD_CARD_TYPE_DDR_1_8V \
                                        | EXT_CSD_CARD_TYPE_DDR_1_2V)
 
+#define EXT_CSD_CARD_TYPE_HS200_1_8V   BIT(4)  /* Card can run at 200MHz */
+                                               /* SDR mode @1.8V I/O */
+#define EXT_CSD_CARD_TYPE_HS200_1_2V   BIT(5)  /* Card can run at 200MHz */
+                                               /* SDR mode @1.2V I/O */
+#define EXT_CSD_CARD_TYPE_HS200                (EXT_CSD_CARD_TYPE_HS200_1_8V | \
+                                        EXT_CSD_CARD_TYPE_HS200_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 */
@@ -219,6 +235,8 @@
 
 #define EXT_CSD_TIMING_LEGACY  0       /* no high speed */
 #define EXT_CSD_TIMING_HS      1       /* HS */
+#define EXT_CSD_TIMING_HS200   2       /* HS200 */
+
 #define EXT_CSD_BOOT_ACK_ENABLE                        (1 << 6)
 #define EXT_CSD_BOOT_PARTITION_ENABLE          (1 << 3)
 #define EXT_CSD_PARTITION_ACCESS_ENABLE                (1 << 0)