board: AM335x-ICEv2: Add cpsw support

In order to enable cpsw on AM335x ICEv2 board, the following needs to be done:

1)There are few on board jumper settings which gives a choice between
cpsw and PRUSS, that needs to be properly selected[1]. Even after selecting
this, there are few GPIOs which control these muxes that needs to be held high.

2) The clock to PHY is provided by a PLL-based clock synthesizer[2] connected
via I2C. This needs to properly programmed and locked for PHY operation.
And PHY needs to be reset before before being used, which is also held by
a GPIO.

3) RMII mode needs to be selected.

[1] http://www.ti.com/lit/zip/tidr336
[2] http://www.ti.com/lit/ds/symlink/cdce913.pdf

Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

board/ti/am335x/board.c

@@ -16,6 +16,7 @@
 #include <asm/arch/omap.h>
 #include <asm/arch/ddr_defs.h>
 #include <asm/arch/clock.h>
+#include <asm/arch/clk_synthesizer.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/mmc_host_def.h>
 #include <asm/arch/sys_proto.h>
@@ -37,8 +38,13 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 /* GPIO that controls power to DDR on EVM-SK */
-#define GPIO_DDR_VTT_EN		7
+#define GPIO_TO_PIN(bank, gpio)		(32 * (bank) + (gpio))
-#define ICE_GPIO_DDR_VTT_EN	18
+#define GPIO_DDR_VTT_EN		GPIO_TO_PIN(0, 7)
+#define ICE_GPIO_DDR_VTT_EN	GPIO_TO_PIN(0, 18)
+#define GPIO_PR1_MII_CTRL	GPIO_TO_PIN(3, 4)
+#define GPIO_MUX_MII_CTRL	GPIO_TO_PIN(3, 10)
+#define GPIO_FET_SWITCH_CTRL	GPIO_TO_PIN(0, 7)
+#define GPIO_PHY_RESET		GPIO_TO_PIN(2, 5)
 
 #if defined(CONFIG_SPL_BUILD) || \
 	(defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_DM_ETH))
@@ -474,6 +480,49 @@ void sdram_init(void)
 }
 #endif
 
+#if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD)) || \
+	(defined(CONFIG_SPL_ETH_SUPPORT) && defined(CONFIG_SPL_BUILD))
+static void request_and_set_gpio(int gpio, char *name)
+{
+	int ret;
+
+	ret = gpio_request(gpio, name);
+	if (ret < 0) {
+		printf("%s: Unable to request %s\n", __func__, name);
+		return;
+	}
+
+	ret = gpio_direction_output(gpio, 0);
+	if (ret < 0) {
+		printf("%s: Unable to set %s  as output\n", __func__, name);
+		goto err_free_gpio;
+	}
+
+	gpio_set_value(gpio, 1);
+
+	return;
+
+err_free_gpio:
+	gpio_free(gpio);
+}
+
+#define REQUEST_AND_SET_GPIO(N)	request_and_set_gpio(N, #N);
+
+/**
+ * RMII mode on ICEv2 board needs 50MHz clock. Given the clock
+ * synthesizer With a capacitor of 18pF, and 25MHz input clock cycle
+ * PLL1 gives an output of 100MHz. So, configuring the div2/3 as 2 to
+ * give 50MHz output for Eth0 and 1.
+ */
+static struct clk_synth cdce913_data = {
+	.id = 0x81,
+	.capacitor = 0x90,
+	.mux = 0x6d,
+	.pdiv2 = 0x2,
+	.pdiv3 = 0x2,
+};
+#endif
+
 /*
  * Basic board specific setup.  Pinmux has been handled already.
  */
@@ -487,6 +536,23 @@ int board_init(void)
 #if defined(CONFIG_NOR) || defined(CONFIG_NAND)
 	gpmc_init();
 #endif
+#if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD))
+	int rv;
+
+	if (board_is_icev2()) {
+		REQUEST_AND_SET_GPIO(GPIO_PR1_MII_CTRL);
+		REQUEST_AND_SET_GPIO(GPIO_MUX_MII_CTRL);
+		REQUEST_AND_SET_GPIO(GPIO_FET_SWITCH_CTRL);
+		REQUEST_AND_SET_GPIO(GPIO_PHY_RESET);
+
+		rv = setup_clock_synthesizer(&cdce913_data);
+		if (rv) {
+			printf("Clock synthesizer setup failed %d\n", rv);
+			return rv;
+		}
+	}
+#endif
+
 	return 0;
 }
 
@@ -554,6 +620,12 @@ static struct cpsw_platform_data cpsw_data = {
 };
 #endif
 
+#if ((defined(CONFIG_SPL_ETH_SUPPORT) || defined(CONFIG_SPL_USBETH_SUPPORT)) &&\
+	defined(CONFIG_SPL_BUILD)) || \
+	((defined(CONFIG_DRIVER_TI_CPSW) || \
+	  defined(CONFIG_USB_ETHER) && defined(CONFIG_MUSB_GADGET)) && \
+	 !defined(CONFIG_SPL_BUILD))
+
 /*
  * This function will:
  * Read the eFuse for MAC addresses, and set ethaddr/eth1addr/usbnet_devaddr
@@ -565,11 +637,6 @@ static struct cpsw_platform_data cpsw_data = {
  * Build in only these cases to avoid warnings about unused variables
  * when we build an SPL that has neither option but full U-Boot will.
  */
-#if ((defined(CONFIG_SPL_ETH_SUPPORT) || defined(CONFIG_SPL_USBETH_SUPPORT)) \
-		&& defined(CONFIG_SPL_BUILD)) || \
-	((defined(CONFIG_DRIVER_TI_CPSW) || \
-	  defined(CONFIG_USB_ETHER) && defined(CONFIG_USB_MUSB_GADGET)) && \
-	 !defined(CONFIG_SPL_BUILD))
 int board_eth_init(bd_t *bis)
 {
 	int rv, n = 0;
@@ -620,6 +687,12 @@ int board_eth_init(bd_t *bis)
 		writel(MII_MODE_ENABLE, &cdev->miisel);
 		cpsw_slaves[0].phy_if = cpsw_slaves[1].phy_if =
 				PHY_INTERFACE_MODE_MII;
+	} else if (board_is_icev2()) {
+		writel(RMII_MODE_ENABLE | RMII_CHIPCKL_ENABLE, &cdev->miisel);
+		cpsw_slaves[0].phy_if = PHY_INTERFACE_MODE_RMII;
+		cpsw_slaves[1].phy_if = PHY_INTERFACE_MODE_RMII;
+		cpsw_slaves[0].phy_addr = 1;
+		cpsw_slaves[1].phy_addr = 3;
 	} else {
 		writel((RGMII_MODE_ENABLE | RGMII_INT_DELAY), &cdev->miisel);
 		cpsw_slaves[0].phy_if = cpsw_slaves[1].phy_if =

include/configs/am335x_evm.h

@@ -475,4 +475,9 @@
 #define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_FLASH_BASE
 #endif  /* NOR support */
 
+#ifdef CONFIG_DRIVER_TI_CPSW
+#define CONFIG_CLOCK_SYNTHESIZER
+#define CLK_SYNTHESIZER_I2C_ADDR 0x65
+#endif
+
 #endif	/* ! __CONFIG_AM335X_EVM_H */