davinci: RMII support for DA850/OMAP-L138 EVM

DA850/OMAP-L138 EVM has a RMII Ethernet PHY on the UI daughter card. The PHY
is enabled by proper programming of the IO Expander (TCA6416) ports. Also for
RMII PHY to work, the MDIO clock of MII PHY has to be disabled since both the
PHYs have the same address. This is done via the GPIO2[6] pin. This patch adds
support for RMII PHY.

This patch also adds a menuconfig option to select one or no peripheral
connected to expander. Currently, sub-options in this menu are RMII and no
peripheral.This menuconfig option is similar to the one present for UI card on
DA830/OMAP-L137 EVM.

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 65 insertions, 3 deletions

diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
index 05b2d87d96bd..53e434ba626d 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -45,6 +45,8 @@
 #define DA850_MMCSD_CD_PIN              GPIO_TO_PIN(4, 0)
 #define DA850_MMCSD_WP_PIN              GPIO_TO_PIN(4, 1)
 
+#define DA850_MII_MDIO_CLKEN_PIN        GPIO_TO_PIN(2, 6)
+
 static struct mtd_partition da850_evm_norflash_partition[] = {
         {
                 .name           = "NOR filesystem",
@@ -152,6 +154,7 @@ static void da850_evm_setup_nor_nand(void);
 static int da850_evm_ui_expander_setup(struct i2c_client *client, unsigned gpio,
                                                 unsigned ngpio, void *c)
 {
+        struct davinci_soc_info *soc_info = &davinci_soc_info;
         int sel_a, sel_b, sel_c, ret;
 
         sel_a = gpio + 7;
@@ -186,6 +189,10 @@ static int da850_evm_ui_expander_setup(struct i2c_client *client, unsigned gpio,
 
         da850_evm_setup_nor_nand();
 
+        if (soc_info->emac_pdata->rmii_en)
+                /* enable RMII */
+                gpio_set_value(sel_a, 0);
+
         return 0;
 
 exp_setup_selc_fail:
@@ -509,6 +516,58 @@ static const short da850_evm_lcdc_pins[] = {
         -1
 };
 
+static int __init da850_evm_config_emac(u8 rmii_en)
+{
+        void __iomem *cfg_chip3_base;
+        int ret;
+        u32 val;
+
+        cfg_chip3_base = DA8XX_SYSCFG_VIRT(DA8XX_CFGCHIP3_REG);
+
+        /* configure the CFGCHIP3 register for RMII or MII */
+        val = __raw_readl(cfg_chip3_base);
+        if (rmii_en)
+                val |= BIT(8);
+        else
+                val &= ~BIT(8);
+
+        __raw_writel(val, cfg_chip3_base);
+
+        if (!rmii_en)
+                ret = da8xx_pinmux_setup(da850_cpgmac_pins);
+        else
+                ret = da8xx_pinmux_setup(da850_rmii_pins);
+        if (ret)
+                pr_warning("da850_evm_init: cpgmac/rmii mux setup failed: %d\n",
+                                ret);
+
+        ret = davinci_cfg_reg(DA850_GPIO2_6);
+        if (ret)
+                pr_warning("da850_evm_init:GPIO(2,6) mux setup "
+                                                        "failed\n");
+
+        ret = gpio_request(DA850_MII_MDIO_CLKEN_PIN, "mdio_clk_en");
+        if (ret) {
+                pr_warning("Cannot open GPIO %d\n",
+                                        DA850_MII_MDIO_CLKEN_PIN);
+                return ret;
+        }
+
+        if (rmii_en) {
+                /* Disable MII MDIO clock */
+                gpio_direction_output(DA850_MII_MDIO_CLKEN_PIN, 1);
+                pr_info("EMAC: RMII PHY configured, MII PHY will not be"
+                                                        " functional\n");
+        } else {
+                /* Enable MII MDIO clock */
+                gpio_direction_output(DA850_MII_MDIO_CLKEN_PIN, 0);
+                pr_info("EMAC: MII PHY configured, RMII PHY will not be"
+                                                        " functional\n");
+        }
+
+        return 0;
+}
+
 static __init void da850_evm_init(void)
 {
         struct davinci_soc_info *soc_info = &davinci_soc_info;
@@ -536,12 +595,15 @@ static __init void da850_evm_init(void)
 
         soc_info->emac_pdata->phy_mask = DA850_EVM_PHY_MASK;
         soc_info->emac_pdata->mdio_max_freq = DA850_EVM_MDIO_FREQUENCY;
+#ifdef CONFIG_DA850_UI_RMII
+        soc_info->emac_pdata->rmii_en = 1;
+#else
         soc_info->emac_pdata->rmii_en = 0;
+#endif
 
-        ret = da8xx_pinmux_setup(da850_cpgmac_pins);
+        ret = da850_evm_config_emac(soc_info->emac_pdata->rmii_en);
         if (ret)
-                pr_warning("da850_evm_init: cpgmac mux setup failed: %d\n",
-                                ret);
+                pr_warning("da850_evm_init: emac setup failed: %d\n", ret);
 
         ret = da8xx_register_emac();
         if (ret)