[U-Boot] [PATCH v2 2/3] board: am335x-icev2: add ethernet phy mode detection logic

[Roger Quadros]

Both ethernet ports can be used as CPSW ethernet (RMII mode)
or PRU ethernet (MII mode) by setting the jumper near the port.
Read the jumper value and set the pinmux, external mux and
PHY clock accordingly.

As jumper line is overridden by PHY RX_DV pin immediately
after bootstrap (power-up/reset), we have to use GPIO edge
detection to capture the jumper line status.

As u-boot doesn't provide any infrastructure for GPIO edge
detection, we directly access the GPIO registers.

Signed-off-by: Roger Quadros <rogerq at ti.com>
---
 board/ti/am335x/board.c | 82 ++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 75 insertions(+), 7 deletions(-)

diff --git a/board/ti/am335x/board.c b/board/ti/am335x/board.c
index 56f4984..bf3b539 100644
--- a/board/ti/am335x/board.c
+++ b/board/ti/am335x/board.c
@@ -46,12 +46,23 @@ DECLARE_GLOBAL_DATA_PTR;
 #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)
+#define GPIO_ETH0_MODE		GPIO_TO_PIN(0, 11)
+#define GPIO_ETH1_MODE		GPIO_TO_PIN(1, 26)
 
 #if defined(CONFIG_SPL_BUILD) || \
 	(defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_DM_ETH))
 static struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE;
 #endif
 
+#define GPIO0_RISINGDETECT	(AM33XX_GPIO0_BASE + OMAP_GPIO_RISINGDETECT)
+#define GPIO1_RISINGDETECT	(AM33XX_GPIO1_BASE + OMAP_GPIO_RISINGDETECT)
+
+#define GPIO0_IRQSTATUS1	(AM33XX_GPIO0_BASE + OMAP_GPIO_IRQSTATUS1)
+#define GPIO1_IRQSTATUS1	(AM33XX_GPIO1_BASE + OMAP_GPIO_IRQSTATUS1)
+
+#define GPIO0_IRQSTATUSRAW	(AM33XX_GPIO0_BASE + 0x024)
+#define GPIO1_IRQSTATUSRAW	(AM33XX_GPIO1_BASE + 0x024)
+
 /*
  * Read header information from EEPROM into global structure.
  */
@@ -491,9 +502,9 @@ void sdram_init(void)
 }
 #endif
 
-#if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD)) || \
+#if !defined(CONFIG_SPL_BUILD) || \
 	(defined(CONFIG_SPL_ETH_SUPPORT) && defined(CONFIG_SPL_BUILD))
-static void request_and_set_gpio(int gpio, char *name)
+static void request_and_set_gpio(int gpio, char *name, int val)
 {
 	int ret;
 
@@ -509,7 +520,7 @@ static void request_and_set_gpio(int gpio, char *name)
 		goto err_free_gpio;
 	}
 
-	gpio_set_value(gpio, 1);
+	gpio_set_value(gpio, val);
 
 	return;
 
@@ -517,7 +528,8 @@ err_free_gpio:
 	gpio_free(gpio);
 }
 
-#define REQUEST_AND_SET_GPIO(N)	request_and_set_gpio(N, #N);
+#define REQUEST_AND_SET_GPIO(N)	request_and_set_gpio(N, #N, 1);
+#define REQUEST_AND_CLR_GPIO(N)	request_and_set_gpio(N, #N, 0);
 
 /**
  * RMII mode on ICEv2 board needs 50MHz clock. Given the clock
@@ -547,20 +559,76 @@ 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 !defined(CONFIG_SPL_BUILD) || \
+	(defined(CONFIG_SPL_ETH_SUPPORT) && defined(CONFIG_SPL_BUILD))
 	if (board_is_icev2()) {
+		int rv;
+		u32 reg;
+
 		REQUEST_AND_SET_GPIO(GPIO_PR1_MII_CTRL);
-		REQUEST_AND_SET_GPIO(GPIO_MUX_MII_CTRL);
+		/* Make J19 status available on GPIO1_26 */
+		REQUEST_AND_CLR_GPIO(GPIO_MUX_MII_CTRL);
+
 		REQUEST_AND_SET_GPIO(GPIO_FET_SWITCH_CTRL);
+		/*
+		 * Both ports can be set as RMII-CPSW or MII-PRU-ETH using
+		 * jumpers near the port. Read the jumper value and set
+		 * the pinmux, external mux and PHY clock accordingly.
+		 * As jumper line is overridden by PHY RX_DV pin immediately
+		 * after bootstrap (power-up/reset), we need to sample
+		 * it during PHY reset using GPIO rising edge detection.
+		 */
 		REQUEST_AND_SET_GPIO(GPIO_PHY_RESET);
+		/* Enable rising edge IRQ on GPIO0_11 and GPIO 1_26 */
+		reg = readl(GPIO0_RISINGDETECT) | BIT(11);
+		writel(reg, GPIO0_RISINGDETECT);
+		reg = readl(GPIO1_RISINGDETECT) | BIT(26);
+		writel(reg, GPIO1_RISINGDETECT);
+		/* Reset PHYs to capture the Jumper setting */
+		gpio_set_value(GPIO_PHY_RESET, 0);
+		udelay(2);	/* PHY datasheet states 1uS min. */
+		gpio_set_value(GPIO_PHY_RESET, 1);
+
+		reg = readl(GPIO0_IRQSTATUSRAW) & BIT(11);
+		if (reg) {
+			writel(reg, GPIO0_IRQSTATUS1); /* clear irq */
+			/* RMII mode */
+			printf("ETH0, CPSW\n");
+		} else {
+			/* MII mode */
+			printf("ETH0, PRU\n");
+			cdce913_data.pdiv3 = 4;	/* 25MHz PHY clk */
+		}
+
+		reg = readl(GPIO1_IRQSTATUSRAW) & BIT(26);
+		if (reg) {
+			writel(reg, GPIO1_IRQSTATUS1); /* clear irq */
+			/* RMII mode */
+			printf("ETH1, CPSW\n");
+			gpio_set_value(GPIO_MUX_MII_CTRL, 1);
+		} else {
+			/* MII mode */
+			printf("ETH1, PRU\n");
+			cdce913_data.pdiv2 = 4;	/* 25MHz PHY clk */
+		}
+
+		/* disable rising edge IRQs */
+		reg = readl(GPIO0_RISINGDETECT) & ~BIT(11);
+		writel(reg, GPIO0_RISINGDETECT);
+		reg = readl(GPIO1_RISINGDETECT) & ~BIT(26);
+		writel(reg, GPIO1_RISINGDETECT);
 
 		rv = setup_clock_synthesizer(&cdce913_data);
 		if (rv) {
 			printf("Clock synthesizer setup failed %d\n", rv);
 			return rv;
 		}
+
+		/* reset PHYs */
+		gpio_set_value(GPIO_PHY_RESET, 0);
+		udelay(2);	/* PHY datasheet states 1uS min. */
+		gpio_set_value(GPIO_PHY_RESET, 1);
 	}
 #endif
 
-- 
2.7.4