Merge branch 'master' of git://git.denx.de/u-boot-mmc

[karo-tx-uboot.git] / drivers / mmc / exynos_dw_mmc.c

diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c
index b3e5c5e5e09b5db5d04bfac1b8bd3093b9d3d655..de8cdcc42b3db83f631b358f24e90cc1d2c5dbed 100644 (file)
--- a/drivers/mmc/exynos_dw_mmc.c
+++ b/drivers/mmc/exynos_dw_mmc.c
@@ -29,9 +29,22 @@ static void exynos_dwmci_clksel(struct dwmci_host *host)
        dwmci_writel(host, DWMCI_CLKSEL, host->clksel_val);
 }
 
-unsigned int exynos_dwmci_get_clk(int dev_index)
+unsigned int exynos_dwmci_get_clk(struct dwmci_host *host)
 {
-       return get_mmc_clk(dev_index);
+       unsigned long sclk;
+       int8_t clk_div;
+
+       /*
+        * Since SDCLKIN is divided inside controller by the DIVRATIO
+        * value set in the CLKSEL register, we need to use the same output
+        * clock value to calculate the CLKDIV value.
+        * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)
+        */
+       clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
+                       & DWMCI_DIVRATIO_MASK) + 1;
+       sclk = get_mmc_clk(host->dev_index);
+
+       return sclk / clk_div;
 }
 
 static void exynos_dwmci_board_init(struct dwmci_host *host)