da850: Add RMII support for EMAC

Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com>

3 files changed, 110 insertions, 3 deletions

diff --git a/board/davinci/da8xxevm/da850evm.c b/board/davinci/da8xxevm/da850evm.c
index fbe1e12def..5fed7f531c 100644
--- a/board/davinci/da8xxevm/da850evm.c
+++ b/board/davinci/da8xxevm/da850evm.c
@@ -68,6 +68,15 @@ const struct pinmux_config uart_pins[] = {
 
 #ifdef CONFIG_DRIVER_TI_EMAC
 const struct pinmux_config emac_pins[] = {
+#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
+	{ pinmux[14], 8, 2 },
+	{ pinmux[14], 8, 3 },
+	{ pinmux[14], 8, 4 },
+	{ pinmux[14], 8, 5 },
+	{ pinmux[14], 8, 6 },
+	{ pinmux[14], 8, 7 },
+	{ pinmux[15], 8, 1 },
+#else
 	{ pinmux[2], 8, 1 },
 	{ pinmux[2], 8, 2 },
 	{ pinmux[2], 8, 3 },
@@ -83,10 +92,11 @@ const struct pinmux_config emac_pins[] = {
 	{ pinmux[3], 8, 5 },
 	{ pinmux[3], 8, 6 },
 	{ pinmux[3], 8, 7 },
+#endif /* CONFIG_DRIVER_TI_EMAC_USE_RMII */
 	{ pinmux[4], 8, 0 },
 	{ pinmux[4], 8, 1 }
 };
-#endif
+#endif /* CONFIG_DRIVER_TI_EMAC */
 
 /* I2C pin muxer settings */
 const struct pinmux_config i2c_pins[] = {
@@ -217,10 +227,12 @@ int board_init(void)
 #ifdef CONFIG_DRIVER_TI_EMAC
 	if (davinci_configure_pin_mux(emac_pins, ARRAY_SIZE(emac_pins)) != 0)
 		return 1;
-#ifdef CONFIG_MACH_DAVINCI_DA850_EVM
+#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
+	REG(CFGCHIP3) |= (1 << 8);
+#else
 	/* set cfgchip3 to selct MII */
 	REG(CFGCHIP3) &= ~(1 << 8);
-#endif /* CONFIG_MACH_DAVINCI_DA850_EVM */
+#endif /* CONFIG_DRIVER_TI_EMAC_USE_RMII */
 
 #endif /* CONFIG_DRIVER_TI_EMAC */
 
@@ -275,6 +287,90 @@ err_probe:
 	return ret;
 }
 
+#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
+/**
+ * rmii_hw_init
+ *
+ * DA850/OMAP-L138 EVM can interface to a daughter card for
+ * additional features. This card has an I2C GPIO Expander TCA6416
+ * to select the required functions like camera, RMII Ethernet,
+ * character LCD, video.
+ *
+ * Initialization of the expander involves configuring the
+ * polarity and direction of the ports. P07-P05 are used here.
+ * These ports are connected to a Mux chip which enables only one
+ * functionality at a time.
+ *
+ * For RMII phy to respond, the MII MDIO clock has to be  disabled
+ * since both the PHY devices have address as zero. The MII MDIO
+ * clock is controlled via GPIO2[6].
+ *
+ * This code is valid for Beta version of the hardware
+ */
+int rmii_hw_init(void)
+{
+	const struct pinmux_config gpio_pins[] = {
+		{ pinmux[6], 8, 1 }
+	};
+	u_int8_t buf[2];
+	unsigned int temp;
+	int ret;
+
+	/* PinMux for GPIO */
+	if (davinci_configure_pin_mux(gpio_pins, ARRAY_SIZE(gpio_pins)) != 0)
+		return 1;
+
+	/* I2C Exapnder configuration */
+	/* Set polarity to non-inverted */
+	buf[0] = 0x0;
+	buf[1] = 0x0;
+	ret = i2c_write(CONFIG_SYS_I2C_EXPANDER_ADDR, 4, 1, buf, 2);
+	if (ret) {
+		printf("\nExpander @ 0x%02x write FAILED!!!\n",
+				CONFIG_SYS_I2C_EXPANDER_ADDR);
+		return ret;
+	}
+
+	/* Configure P07-P05 as outputs */
+	buf[0] = 0x1f;
+	buf[1] = 0xff;
+	ret = i2c_write(CONFIG_SYS_I2C_EXPANDER_ADDR, 6, 1, buf, 2);
+	if (ret) {
+		printf("\nExpander @ 0x%02x write FAILED!!!\n",
+				CONFIG_SYS_I2C_EXPANDER_ADDR);
+	}
+
+	/* For Ethernet RMII selection
+	 * P07(SelA)=0
+	 * P06(SelB)=1
+	 * P05(SelC)=1
+	 */
+	if (i2c_read(CONFIG_SYS_I2C_EXPANDER_ADDR, 2, 1, buf, 1)) {
+		printf("\nExpander @ 0x%02x read FAILED!!!\n",
+				CONFIG_SYS_I2C_EXPANDER_ADDR);
+	}
+
+	buf[0] &= 0x1f;
+	buf[0] |= (0 << 7) | (1 << 6) | (1 << 5);
+	if (i2c_write(CONFIG_SYS_I2C_EXPANDER_ADDR, 2, 1, buf, 1)) {
+		printf("\nExpander @ 0x%02x write FAILED!!!\n",
+				CONFIG_SYS_I2C_EXPANDER_ADDR);
+	}
+
+	/* Set the output as high */
+	temp = REG(GPIO_BANK2_REG_SET_ADDR);
+	temp |= (0x01 << 6);
+	REG(GPIO_BANK2_REG_SET_ADDR) = temp;
+
+	/* Set the GPIO direction as output */
+	temp = REG(GPIO_BANK2_REG_DIR_ADDR);
+	temp &= ~(0x01 << 6);
+	REG(GPIO_BANK2_REG_DIR_ADDR) = temp;
+
+	return 0;
+}
+#endif
+
 int misc_init_r(void)
 {
 	uint8_t tmp[20], addr[10];
@@ -296,6 +392,12 @@ int misc_init_r(void)
 		setenv("ethaddr", (char *)tmp);
 	}
 
+#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
+	/* Select RMII fucntion through the expander */
+	if (rmii_hw_init())
+		printf("RMII hardware init failed!!!\n");
+#endif
+
 	return (0);
 }
 
diff --git a/include/asm-arm/arch-davinci/hardware.h b/include/asm-arm/arch-davinci/hardware.h
index 7b5f0940e2..f22a77dac4 100644
--- a/include/asm-arm/arch-davinci/hardware.h
+++ b/include/asm-arm/arch-davinci/hardware.h
@@ -152,6 +152,10 @@ typedef volatile unsigned int *	dv_reg_p;
 #define DAVINCI_BOOTCFG_BASE			0x01c14000
 #define JTAG_ID_REG				(DAVINCI_BOOTCFG_BASE + 0x18)
 #define CFGCHIP3				(DAVINCI_BOOTCFG_BASE + 0x188)
+#define GPIO_BANK2_REG_DIR_ADDR			(DAVINCI_GPIO_BASE + 0x38)
+#define GPIO_BANK2_REG_OPDATA_ADDR		(DAVINCI_GPIO_BASE + 0x3c)
+#define GPIO_BANK2_REG_SET_ADDR			(DAVINCI_GPIO_BASE + 0x40)
+#define GPIO_BANK2_REG_CLR_ADDR			(DAVINCI_GPIO_BASE + 0x44)
 
 #endif /* CONFIG_SOC_DA8XX */
 
diff --git a/include/configs/da850evm.h b/include/configs/da850evm.h
index dc4e7377cf..35c5c9bf58 100644
--- a/include/configs/da850evm.h
+++ b/include/configs/da850evm.h
@@ -91,6 +91,7 @@
  */
 #define CONFIG_SYS_I2C_EEPROM_ADDR_LEN	2
 #define CONFIG_SYS_I2C_EEPROM_ADDR	0x50
+#define CONFIG_SYS_I2C_EXPANDER_ADDR	0x20
 #define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS	6
 #define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS	20