omap3evm: Update ethernet reset sequence for Rev.G board

The GPIO pin used for resetting the external LAN chip has
changed for Rev.G board.

The patch uses generic gpio API instead of direct access
to corresponding registers.

Signed-off-by: Sriramakrishnan <srk@ti.com>
Signed-off-by: Sanjeev Premi <premi@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

board/ti/evm/evm.c

@@ -33,10 +33,14 @@
 #include <asm/arch/mem.h>
 #include <asm/arch/mux.h>
 #include <asm/arch/sys_proto.h>
+#include <asm/arch/gpio.h>
 #include <i2c.h>
 #include <asm/mach-types.h>
 #include "evm.h"
 
+#define OMAP3EVM_GPIO_ETH_RST_GEN1		64
+#define OMAP3EVM_GPIO_ETH_RST_GEN2		7
+
 DECLARE_GLOBAL_DATA_PTR;
 
 static u32 omap3_evm_version;
@@ -181,17 +185,30 @@ static void setup_net_chip(void)
  */
 static void reset_net_chip(void)
 {
-	struct gpio *gpio3_base = (struct gpio *)OMAP34XX_GPIO3_BASE;
-
-	/* Make GPIO 64 as output pin */
-	writel(readl(&gpio3_base->oe) & ~(GPIO0), &gpio3_base->oe);
-
-	/* Now send a pulse on the GPIO pin */
-	writel(GPIO0, &gpio3_base->setdataout);
+	int ret;
+	int rst_gpio;
+
+	if (get_omap3_evm_rev() == OMAP3EVM_BOARD_GEN_1) {
+		rst_gpio = OMAP3EVM_GPIO_ETH_RST_GEN1;
+	} else {
+		rst_gpio = OMAP3EVM_GPIO_ETH_RST_GEN2;
+	}
+
+	ret = omap_request_gpio(rst_gpio);
+	if (ret < 0) {
+		printf("Unable to get GPIO %d\n", rst_gpio);
+		return ;
+	}
+
+	/* Configure as output */
+	omap_set_gpio_direction(rst_gpio, 0);
+
+	/* Send a pulse on the GPIO pin */
+	omap_set_gpio_dataout(rst_gpio, 1);
 	udelay(1);
-	writel(GPIO0, &gpio3_base->cleardataout);
+	omap_set_gpio_dataout(rst_gpio, 0);
 	udelay(1);
-	writel(GPIO0, &gpio3_base->setdataout);
+	omap_set_gpio_dataout(rst_gpio, 1);
 }
 
 int board_eth_init(bd_t *bis)