mmc: ca_dw_mmc: Misc cleanup of driver

- Rename DT compatible name
- Remove uneccessary if-statement to support 8-bit buswidth
- Remove redundant error msg
- Use symbolic constants in switch statement

Signed-off-by: Arthur Li <arthur.li@cortina-access.com>
Signed-off-by: Alex Nemirovsky <alex.nemirovsky@cortina-access.com>
CC: Peng Fan <peng.fan@nxp.com>
CC: Jaehoon Chung <jh80.chung@samsung.com>
CC: Tom Rini <trini@konsulko.com>

diff --git a/drivers/mmc/ca_dw_mmc.c b/drivers/mmc/ca_dw_mmc.c
index acbc850..198c41f 100644 (file)
--- a/drivers/mmc/ca_dw_mmc.c
+++ b/drivers/mmc/ca_dw_mmc.c
@@ -19,6 +19,7 @@
 
 #define SD_CLK_SEL_200MHZ (0x2)
 #define SD_CLK_SEL_100MHZ (0x1)
+#define SD_CLK_SEL_50MHZ (0x0)
 
 #define IO_DRV_SD_DS_OFFSET (16)
 #define IO_DRV_SD_DS_MASK   (0xff << IO_DRV_SD_DS_OFFSET)
@@ -44,15 +45,11 @@ static void ca_dwmci_clksel(struct dwmci_host *host)
        struct ca_dwmmc_priv_data *priv = host->priv;
        u32 val = readl(priv->sd_dll_reg);
 
-       if (host->bus_hz >= 200000000) {
-               val &= ~SD_CLK_SEL_MASK;
+       val &= ~SD_CLK_SEL_MASK;
+       if (host->bus_hz >= 200000000)
                val |= SD_CLK_SEL_200MHZ;
-       } else if (host->bus_hz >= 100000000) {
-               val &= ~SD_CLK_SEL_MASK;
+       else if (host->bus_hz >= 100000000)
                val |= SD_CLK_SEL_100MHZ;
-       } else {
-               val &= ~SD_CLK_SEL_MASK;
-       }
 
        writel(val, priv->sd_dll_reg);
 }
@@ -77,14 +74,14 @@ unsigned int ca_dwmci_get_mmc_clock(struct dwmci_host *host, uint freq)
        u8 clk_div;
 
        switch (sd_clk_sel) {
-       case 2:
-               clk_div = 1;
+       case SD_CLK_SEL_50MHZ:
+               clk_div = 4;
                break;
-       case 1:
+       case SD_CLK_SEL_100MHZ:
                clk_div = 2;
                break;
        default:
-               clk_div = 4;
+               clk_div = 1;
        }
 
        return SD_SCLK_MAX / clk_div / (host->div + 1);
@@ -100,9 +97,6 @@ static int ca_dwmmc_ofdata_to_platdata(struct udevice *dev)
        host->dev_index = 0;
 
        host->buswidth = dev_read_u32_default(dev, "bus-width", 1);
-       if (host->buswidth != 1 && host->buswidth != 4)
-               return -EINVAL;
-
        host->bus_hz = dev_read_u32_default(dev, "max-frequency", 50000000);
        priv->ds = dev_read_u32_default(dev, "io_ds", 0x33);
        host->fifo_mode = dev_read_bool(dev, "fifo-mode");
@@ -118,10 +112,8 @@ static int ca_dwmmc_ofdata_to_platdata(struct udevice *dev)
                return -EINVAL;
 
        host->ioaddr = dev_read_addr_ptr(dev);
-       if (host->ioaddr == (void *)FDT_ADDR_T_NONE) {
-               printf("DWMMC: base address is invalid\n");
+       if (!host->ioaddr)
                return -EINVAL;
-       }
 
        host->priv = priv;
 
@@ -140,10 +132,8 @@ static int ca_dwmmc_probe(struct udevice *dev)
        memcpy(&ca_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
 
        dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, MIN_FREQ);
-       if (host->buswidth == 1) {
-               (&plat->cfg)->host_caps &= ~MMC_MODE_8BIT;
-               (&plat->cfg)->host_caps &= ~MMC_MODE_4BIT;
-       }
+       if (host->buswidth == 1)
+               (&plat->cfg)->host_caps &= ~(MMC_MODE_8BIT | MMC_MODE_4BIT);
 
        host->mmc = &plat->mmc;
        host->mmc->priv = &priv->host;
@@ -164,7 +154,7 @@ static int ca_dwmmc_bind(struct udevice *dev)
 }
 
 static const struct udevice_id ca_dwmmc_ids[] = {
-       { .compatible = "snps,dw-cortina" },
+       { .compatible = "cortina,ca-mmc" },
        { }
 };