[U-Boot] [PATCH v2] mmc: fsl_esdhc: Add support for DDR mode

[Volodymyr Riazantsev]

Add support of the DDR mode for eSDHC driver.
Enable it for i.MX6 SoC family only.

Change-Id: Ie27a945c9fe79d044cc886e269b60747f1744116
Signed-off-by: Volodymyr Riazantsev <volodymyr.riazant...@globallogic.com>
---
 drivers/mmc/fsl_esdhc.c      | 8 ++++++--
 include/configs/mx6_common.h | 2 ++
 include/fsl_esdhc.h          | 1 +
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index c55eb28..f5d2ccb 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -319,7 +319,8 @@ esdhc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct 
mmc_data *data)
        esdhc_write32(&regs->cmdarg, cmd->cmdarg);
 #if defined(CONFIG_FSL_USDHC)
        esdhc_write32(&regs->mixctrl,
-       (esdhc_read32(&regs->mixctrl) & 0xFFFFFF80) | (xfertyp & 0x7F));
+       (esdhc_read32(&regs->mixctrl) & 0xFFFFFF80) | (xfertyp & 0x7F)
+                       | (mmc->ddr_mode ? XFERTYP_DDREN : 0));
        esdhc_write32(&regs->xfertyp, xfertyp & 0xFFFF0000);
 #else
        esdhc_write32(&regs->xfertyp, xfertyp);
@@ -442,7 +443,7 @@ static void set_sysctl(struct mmc *mmc, uint clock)
                if ((sdhc_clk / (div * pre_div)) <= clock)
                        break;
 
-       pre_div >>= 1;
+       pre_div >>= mmc->ddr_mode ? 2 : 1;
        div -= 1;
 
        clk = (pre_div << 8) | (div << 4);
@@ -601,6 +602,9 @@ int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg 
*cfg)
        }
 
        cfg->cfg.host_caps = MMC_MODE_4BIT | MMC_MODE_8BIT | MMC_MODE_HC;
+#ifdef CONFIG_SYS_FSL_ESDHC_HAS_DDR_MODE
+       cfg->cfg.host_caps |= MMC_MODE_DDR_52MHz;
+#endif
 
        if (cfg->max_bus_width > 0) {
                if (cfg->max_bus_width < 8)
diff --git a/include/configs/mx6_common.h b/include/configs/mx6_common.h
index e0528ce..29b72b2 100644
--- a/include/configs/mx6_common.h
+++ b/include/configs/mx6_common.h
@@ -28,6 +28,8 @@
 #define CONFIG_SYS_PL310_BASE  L2_PL310_BASE
 #endif
 
+#define CONFIG_SYS_FSL_ESDHC_HAS_DDR_MODE
+
 #define CONFIG_MP
 #define CONFIG_MXC_GPT_HCLK
 
diff --git a/include/fsl_esdhc.h b/include/fsl_esdhc.h
index c1b6648..313fa1e 100644
--- a/include/fsl_esdhc.h
+++ b/include/fsl_esdhc.h
@@ -108,6 +108,7 @@
 #define XFERTYP_RSPTYP_48_BUSY 0x00030000
 #define XFERTYP_MSBSEL         0x00000020
 #define XFERTYP_DTDSEL         0x00000010
+#define XFERTYP_DDREN          0x00000008
 #define XFERTYP_AC12EN         0x00000004
 #define XFERTYP_BCEN           0x00000002
 #define XFERTYP_DMAEN          0x00000001
-- 
2.2.0

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