mmc: dw_mmc: exynos: add the function for controlling SMU

Some of Exynos has the Security management Unit(SMU).
This patch adds the function for controlling SMU.

In future, if exynos needs to control SMU, it can be implemented
in "config_smu" function, not "init" function.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index 8790f2afc057f3909f64b50d0bab558ea74fe53c..0e989eb25d1275450adbe416f13c7b50a324e2a6 100644 (file)
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -91,10 +91,14 @@ static inline u8 dw_mci_exynos_get_ciu_div(struct dw_mci *host)
                return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL)) + 1;
 }
 
-static int dw_mci_exynos_priv_init(struct dw_mci *host)
+static void dw_mci_exynos_config_smu(struct dw_mci *host)
 {
        struct dw_mci_exynos_priv_data *priv = host->priv;
 
+       /*
+        * If Exynos is provided the Security management,
+        * set for non-ecryption mode at this time.
+        */
        if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS5420_SMU ||
                priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) {
                mci_writel(host, MPSBEGIN0, 0);
@@ -104,6 +108,13 @@ static int dw_mci_exynos_priv_init(struct dw_mci *host)
                           SDMMC_MPSCTRL_VALID |
                           SDMMC_MPSCTRL_NON_SECURE_WRITE_BIT);
        }
+}
+
+static int dw_mci_exynos_priv_init(struct dw_mci *host)
+{
+       struct dw_mci_exynos_priv_data *priv = host->priv;
+
+       dw_mci_exynos_config_smu(host);
 
        if (priv->ctrl_type >= DW_MCI_TYPE_EXYNOS5420) {
                priv->saved_strobe_ctrl = mci_readl(host, HS400_DLINE_CTRL);
@@ -169,7 +180,7 @@ static int dw_mci_exynos_resume(struct device *dev)
 {
        struct dw_mci *host = dev_get_drvdata(dev);
 
-       dw_mci_exynos_priv_init(host);
+       dw_mci_exynos_config_smu(host);
        return dw_mci_resume(host);
 }