mmc: dwmmc: Change designware MMC 'clksel' callback function to return status

Change 'clksel' callback function to allow the code to return a
status.

This patch is a preparation for enabling Arm-Trusted-Firmware (ATF)
in Intel SoC FPGA. This patch does not change functionality.

When using Arm-Trusted-Firmware (ATF) in Intel SoC FPGA, the MMC clock
related register is secure register which is required to be written
via SMC/PCSI call. It is possible that U-Boot fail to write the
register if there is unexpected error between U-Boot and ATF.
As a result, there maybe signal integrity on MMC connection due to
clock. So, the code should reports error to user when 'clksel' fail.

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>

diff --git a/drivers/mmc/ca_dw_mmc.c b/drivers/mmc/ca_dw_mmc.c
index fad2ff5..2b79356 100644 (file)
--- a/drivers/mmc/ca_dw_mmc.c
+++ b/drivers/mmc/ca_dw_mmc.c
@@ -40,7 +40,7 @@ struct ca_dwmmc_priv_data {
        u8 ds;
 };
 
-static void ca_dwmci_clksel(struct dwmci_host *host)
+static int ca_dwmci_clksel(struct dwmci_host *host)
 {
        struct ca_dwmmc_priv_data *priv = host->priv;
        u32 val = readl(priv->sd_dll_reg);
@@ -52,6 +52,8 @@ static void ca_dwmci_clksel(struct dwmci_host *host)
                val |= SD_CLK_SEL_100MHZ;
 
        writel(val, priv->sd_dll_reg);
+
+       return 0;
 }
 
 static void ca_dwmci_board_init(struct dwmci_host *host)

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 7702f4b..7c8a312 100644 (file)
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -496,8 +496,13 @@ static int dwmci_set_ios(struct mmc *mmc)
 
        dwmci_writel(host, DWMCI_UHS_REG, regs);
 
-       if (host->clksel)
-               host->clksel(host);
+       if (host->clksel) {
+               int ret;
+
+               ret = host->clksel(host);
+               if (ret)
+                       return ret;
+       }
 
 #if CONFIG_IS_ENABLED(DM_REGULATOR)
        if (mmc->vqmmc_supply) {

diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c
index 3aa9fb3..2fc1ef1 100644 (file)
--- a/drivers/mmc/exynos_dw_mmc.c
+++ b/drivers/mmc/exynos_dw_mmc.c
@@ -44,7 +44,7 @@ struct dwmci_exynos_priv_data {
  * Function used as callback function to initialise the
  * CLKSEL register for every mmc channel.
  */
-static void exynos_dwmci_clksel(struct dwmci_host *host)
+static int exynos_dwmci_clksel(struct dwmci_host *host)
 {
 #ifdef CONFIG_DM_MMC
        struct dwmci_exynos_priv_data *priv =
@@ -53,6 +53,8 @@ static void exynos_dwmci_clksel(struct dwmci_host *host)
        struct dwmci_exynos_priv_data *priv = host->priv;
 #endif
        dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
+
+       return 0;
 }
 
 unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)

diff --git a/drivers/mmc/nexell_dw_mmc.c b/drivers/mmc/nexell_dw_mmc.c
index 753c89d..2723e48 100644 (file)
--- a/drivers/mmc/nexell_dw_mmc.c
+++ b/drivers/mmc/nexell_dw_mmc.c
@@ -51,7 +51,7 @@ struct nexell_dwmmc_priv {
 
 struct clk *clk_get(const char *id);
 
-static void nx_dw_mmc_clksel(struct dwmci_host *host)
+static int nx_dw_mmc_clksel(struct dwmci_host *host)
 {
        /* host->priv is pointer to "struct udevice" */
        struct nexell_dwmmc_priv *priv = dev_get_priv(host->priv);
@@ -65,6 +65,8 @@ static void nx_dw_mmc_clksel(struct dwmci_host *host)
                      DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(3);
 
        dwmci_writel(host, DWMCI_CLKSEL, val);
+
+       return 0;
 }
 
 static void nx_dw_mmc_reset(int ch)

diff --git a/drivers/mmc/socfpga_dw_mmc.c b/drivers/mmc/socfpga_dw_mmc.c
index dc008c5..7d8c452 100644 (file)
--- a/drivers/mmc/socfpga_dw_mmc.c
+++ b/drivers/mmc/socfpga_dw_mmc.c
@@ -46,7 +46,7 @@ static void socfpga_dwmci_reset(struct udevice *dev)
        reset_deassert_bulk(&reset_bulk);
 }
 
-static void socfpga_dwmci_clksel(struct dwmci_host *host)
+static int socfpga_dwmci_clksel(struct dwmci_host *host)
 {
        struct dwmci_socfpga_priv_data *priv = host->priv;
        u32 sdmmc_mask = ((priv->smplsel & 0x7) << SYSMGR_SDMMC_SMPLSEL_SHIFT) |
@@ -66,6 +66,8 @@ static void socfpga_dwmci_clksel(struct dwmci_host *host)
        /* Enable SDMMC clock */
        setbits_le32(socfpga_get_clkmgr_addr() + CLKMGR_PERPLL_EN,
                     CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
+
+       return 0;
 }
 
 static int socfpga_dwmmc_get_clk_rate(struct udevice *dev)

diff --git a/include/dwmmc.h b/include/dwmmc.h
index 51ab74e..5fc8ed8 100644 (file)
--- a/include/dwmmc.h
+++ b/include/dwmmc.h
@@ -174,7 +174,7 @@ struct dwmci_host {
        struct mmc *mmc;
        void *priv;
 
-       void (*clksel)(struct dwmci_host *host);
+       int (*clksel)(struct dwmci_host *host);
        void (*board_init)(struct dwmci_host *host);
 
        /**