[U-Boot] [PATCHv2 07/10] mmc: dw_mmc: support the DDR mode

[Jaehoon Chung]

Support the DDR mode at dw-mmc controller

Signed-off-by: Jaehoon Chung <jh80.chung at samsung.com>
---
 drivers/mmc/dw_mmc.c |   10 +++++++++-
 include/dwmmc.h      |    3 +++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index d45c15c..174cd3a 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -285,7 +285,7 @@ static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
 static void dwmci_set_ios(struct mmc *mmc)
 {
 	struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
-	u32 ctype;
+	u32 ctype, regs;
 
 	debug("Buswidth = %d, clock: %d\n",mmc->bus_width, mmc->clock);
 
@@ -304,6 +304,14 @@ static void dwmci_set_ios(struct mmc *mmc)
 
 	dwmci_writel(host, DWMCI_CTYPE, ctype);
 
+	regs = dwmci_readl(host, DWMCI_UHS_REG);
+	if (mmc->card_caps & MMC_MODE_DDR_52MHz)
+		regs |= DWMCI_DDR_MODE;
+	else
+		regs &= DWMCI_DDR_MODE;
+
+	dwmci_writel(host, DWMCI_UHS_REG, regs);
+
 	if (host->clksel)
 		host->clksel(host);
 }
diff --git a/include/dwmmc.h b/include/dwmmc.h
index f391b63..45d191a 100644
--- a/include/dwmmc.h
+++ b/include/dwmmc.h
@@ -123,6 +123,9 @@
 #define DWMCI_BMOD_IDMAC_FB	(1 << 1)
 #define DWMCI_BMOD_IDMAC_EN	(1 << 7)
 
+/* UHS register */
+#define DWMCI_DDR_MODE	(1 << 16)
+
 /* quirks */
 #define DWMCI_QUIRK_DISABLE_SMU		(1 << 0)
 
-- 
1.7.9.5