board/davinci/da8xxevm/da850evm.c - github/trini/u-boot - Gitiles

 /*
  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
  *
  * Based on da830evm.c. Original Copyrights follow:
  *
  * Copyright (C) 2009 Nick Thompson, GE Fanuc, Ltd. <nick.thompson@gefanuc.com>
  * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #include <common.h>
 #include <i2c.h>
 #include <net.h>
 #include <netdev.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/emif_defs.h>
 #include <asm/arch/emac_defs.h>
 #include <asm/arch/pinmux_defs.h>
 #include <asm/io.h>
 #include <asm/arch/davinci_misc.h>
 #include <hwconfig.h>

 DECLARE_GLOBAL_DATA_PTR;

 #ifdef CONFIG_DRIVER_TI_EMAC
 #ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
 #define HAS_RMII 1
 #else
 #define HAS_RMII 0
 #endif
 #endif /* CONFIG_DRIVER_TI_EMAC */

 void dsp_lpsc_on(unsigned domain, unsigned int id)
 {
 	dv_reg_p mdstat, mdctl, ptstat, ptcmd;
 	struct davinci_psc_regs *psc_regs;

 	psc_regs = davinci_psc0_regs;
 	mdstat = &psc_regs->psc0.mdstat[id];
 	mdctl = &psc_regs->psc0.mdctl[id];
 	ptstat = &psc_regs->ptstat;
 	ptcmd = &psc_regs->ptcmd;

 	while (*ptstat & (0x1 << domain))
 		;

 	if ((*mdstat & 0x1f) == 0x03)
 		return;                 /* Already on and enabled */

 	*mdctl |= 0x03;

 	*ptcmd = 0x1 << domain;

 	while (*ptstat & (0x1 << domain))
 		;
 	while ((*mdstat & 0x1f) != 0x03)
 		;		/* Probably an overkill... */
 }

 static void dspwake(void)
 {
 	unsigned *resetvect = (unsigned *)DAVINCI_L3CBARAM_BASE;
 	u32 val;

 	/* if the device is ARM only, return */
 	if ((readl(CHIP_REV_ID_REG) & 0x3f) == 0x10)
 		return;

 	if (hwconfig_subarg_cmp_f("dsp", "wake", "no", NULL))
 		return;

 	*resetvect++ = 0x1E000; /* DSP Idle */
 	/* clear out the next 10 words as NOP */
 	memset(resetvect, 0, sizeof(unsigned) *10);

 	/* setup the DSP reset vector */
 	writel(DAVINCI_L3CBARAM_BASE, HOST1CFG);

 	dsp_lpsc_on(1, DAVINCI_LPSC_GEM);
 	val = readl(PSC0_MDCTL + (15 * 4));
 	val |= 0x100;
 	writel(val, (PSC0_MDCTL + (15 * 4)));
 }

 int misc_init_r(void)
 {
 	dspwake();
 	return 0;
 }

 static const struct pinmux_config gpio_pins[] = {
 #ifdef CONFIG_USE_NOR
 	/* GP0[11] is required for NOR to work on Rev 3 EVMs */
 	{ pinmux(0), 8, 4 },	/* GP0[11] */
 #endif
 };

 static const struct pinmux_resource pinmuxes[] = {
 #ifdef CONFIG_DRIVER_TI_EMAC
 	PINMUX_ITEM(emac_pins_mdio),
 #ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
 	PINMUX_ITEM(emac_pins_rmii),
 #else
 	PINMUX_ITEM(emac_pins_mii),
 #endif
 #endif
 #ifdef CONFIG_SPI_FLASH
 	PINMUX_ITEM(spi1_pins_base),
 	PINMUX_ITEM(spi1_pins_scs0),
 #endif
 	PINMUX_ITEM(uart2_pins_txrx),
 	PINMUX_ITEM(uart2_pins_rtscts),
 	PINMUX_ITEM(i2c0_pins),
 #ifdef CONFIG_NAND_DAVINCI
 	PINMUX_ITEM(emifa_pins_cs3),
 	PINMUX_ITEM(emifa_pins_cs4),
 	PINMUX_ITEM(emifa_pins_nand),
 #elif defined(CONFIG_USE_NOR)
 	PINMUX_ITEM(emifa_pins_cs2),
 	PINMUX_ITEM(emifa_pins_nor),
 #endif
 	PINMUX_ITEM(gpio_pins),
 };

 static const struct lpsc_resource lpsc[] = {
 	{ DAVINCI_LPSC_AEMIF },	/* NAND, NOR */
 	{ DAVINCI_LPSC_SPI1 },	/* Serial Flash */
 	{ DAVINCI_LPSC_EMAC },	/* image download */
 	{ DAVINCI_LPSC_UART2 },	/* console */
 	{ DAVINCI_LPSC_GPIO },
 };

 #ifndef CONFIG_DA850_EVM_MAX_CPU_CLK
 #define CONFIG_DA850_EVM_MAX_CPU_CLK	300000000
 #endif

 #define REV_AM18X_EVM		0x100

 /*
  * get_board_rev() - setup to pass kernel board revision information
  * Returns:
  * bit[0-3]	Maximum cpu clock rate supported by onboard SoC
  *		0000b - 300 MHz
  *		0001b - 372 MHz
  *		0010b - 408 MHz
  *		0011b - 456 MHz
  */
 u32 get_board_rev(void)
 {
 	char *s;
 	u32 maxcpuclk = CONFIG_DA850_EVM_MAX_CPU_CLK;
 	u32 rev = 0;

 	s = getenv("maxcpuclk");
 	if (s)
 		maxcpuclk = simple_strtoul(s, NULL, 10);

 	if (maxcpuclk >= 456000000)
 		rev = 3;
 	else if (maxcpuclk >= 408000000)
 		rev = 2;
 	else if (maxcpuclk >= 372000000)
 		rev = 1;
 #ifdef CONFIG_DA850_AM18X_EVM
 	rev |= REV_AM18X_EVM;
 #endif
 	return rev;
 }

 int board_early_init_f(void)
 {
 	/*
 	 * Power on required peripherals
 	 * ARM does not have access by default to PSC0 and PSC1
 	 * assuming here that the DSP bootloader has set the IOPU
 	 * such that PSC access is available to ARM
 	 */
 	if (da8xx_configure_lpsc_items(lpsc, ARRAY_SIZE(lpsc)))
 		return 1;

 	return 0;
 }

 int board_init(void)
 {
 #ifdef CONFIG_USE_NOR
 	u32 val;
 #endif

 #ifndef CONFIG_USE_IRQ
 	irq_init();
 #endif

 #ifdef CONFIG_NAND_DAVINCI
 	/*
 	 * NAND CS setup - cycle counts based on da850evm NAND timings in the
 	 * Linux kernel @ 25MHz EMIFA
 	 */
 	writel((DAVINCI_ABCR_WSETUP(0) |
 		DAVINCI_ABCR_WSTROBE(1) |
 		DAVINCI_ABCR_WHOLD(0) |
 		DAVINCI_ABCR_RSETUP(0) |
 		DAVINCI_ABCR_RSTROBE(1) |
 		DAVINCI_ABCR_RHOLD(0) |
 		DAVINCI_ABCR_TA(1) |
 		DAVINCI_ABCR_ASIZE_8BIT),
 	       &davinci_emif_regs->ab2cr); /* CS3 */
 #endif

 	/* arch number of the board */
 	gd->bd->bi_arch_number = MACH_TYPE_DAVINCI_DA850_EVM;

 	/* address of boot parameters */
 	gd->bd->bi_boot_params = LINUX_BOOT_PARAM_ADDR;

 	/* setup the SUSPSRC for ARM to control emulation suspend */
 	writel(readl(&davinci_syscfg_regs->suspsrc) &
 	       ~(DAVINCI_SYSCFG_SUSPSRC_EMAC | DAVINCI_SYSCFG_SUSPSRC_I2C |
 		 DAVINCI_SYSCFG_SUSPSRC_SPI1 | DAVINCI_SYSCFG_SUSPSRC_TIMER0 |
 		 DAVINCI_SYSCFG_SUSPSRC_UART2),
 	       &davinci_syscfg_regs->suspsrc);

 	/* configure pinmux settings */
 	if (davinci_configure_pin_mux_items(pinmuxes, ARRAY_SIZE(pinmuxes)))
 		return 1;

 #ifdef CONFIG_USE_NOR
 	/* Set the GPIO direction as output */
 	clrbits_be32((u32 *)GPIO_BANK0_REG_DIR_ADDR, (0x01 << 11));

 	/* Set the output as low */
 	val = readl(GPIO_BANK0_REG_SET_ADDR);
 	val |= (0x01 << 11);
 	writel(val, GPIO_BANK0_REG_CLR_ADDR);
 #endif

 #ifdef CONFIG_DRIVER_TI_EMAC
 	davinci_emac_mii_mode_sel(HAS_RMII);
 #endif /* CONFIG_DRIVER_TI_EMAC */

 	/* enable the console UART */
 	writel((DAVINCI_UART_PWREMU_MGMT_FREE | DAVINCI_UART_PWREMU_MGMT_URRST |
 		DAVINCI_UART_PWREMU_MGMT_UTRST),
 	       &davinci_uart2_ctrl_regs->pwremu_mgmt);

 	return 0;
 }

 #ifdef CONFIG_DRIVER_TI_EMAC

 #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 /* CONFIG_DRIVER_TI_EMAC_USE_RMII */

 /*
  * Initializes on-board ethernet controllers.
  */
 int board_eth_init(bd_t *bis)
 {
 #ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
 	/* Select RMII fucntion through the expander */
 	if (rmii_hw_init())
 		printf("RMII hardware init failed!!!\n");
 #endif
 	if (!davinci_emac_initialize()) {
 		printf("Error: Ethernet init failed!\n");
 		return -1;
 	}

 	return 0;
 }
 #endif /* CONFIG_DRIVER_TI_EMAC */
	/*
	* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
	*
	* Based on da830evm.c. Original Copyrights follow:
	*
	* Copyright (C) 2009 Nick Thompson, GE Fanuc, Ltd. <nick.thompson@gefanuc.com>
	* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#include <common.h>
	#include <i2c.h>
	#include <net.h>
	#include <netdev.h>
	#include <asm/arch/hardware.h>
	#include <asm/arch/emif_defs.h>
	#include <asm/arch/emac_defs.h>
	#include <asm/arch/pinmux_defs.h>
	#include <asm/io.h>
	#include <asm/arch/davinci_misc.h>
	#include <hwconfig.h>

	DECLARE_GLOBAL_DATA_PTR;

	#ifdef CONFIG_DRIVER_TI_EMAC
	#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
	#define HAS_RMII 1
	#else
	#define HAS_RMII 0
	#endif
	#endif /* CONFIG_DRIVER_TI_EMAC */

	void dsp_lpsc_on(unsigned domain, unsigned int id)
	{
	dv_reg_p mdstat, mdctl, ptstat, ptcmd;
	struct davinci_psc_regs *psc_regs;

	psc_regs = davinci_psc0_regs;
	mdstat = &psc_regs->psc0.mdstat[id];
	mdctl = &psc_regs->psc0.mdctl[id];
	ptstat = &psc_regs->ptstat;
	ptcmd = &psc_regs->ptcmd;

	while (*ptstat & (0x1 << domain))
	;

	if ((*mdstat & 0x1f) == 0x03)
	return; /* Already on and enabled */

	*mdctl \|= 0x03;

	*ptcmd = 0x1 << domain;

	while (*ptstat & (0x1 << domain))
	;
	while ((*mdstat & 0x1f) != 0x03)
	; /* Probably an overkill... */
	}

	static void dspwake(void)
	{
	unsigned resetvect = (unsigned )DAVINCI_L3CBARAM_BASE;
	u32 val;

	/* if the device is ARM only, return */
	if ((readl(CHIP_REV_ID_REG) & 0x3f) == 0x10)
	return;

	if (hwconfig_subarg_cmp_f("dsp", "wake", "no", NULL))
	return;

	resetvect++ = 0x1E000; / DSP Idle */
	/* clear out the next 10 words as NOP */
	memset(resetvect, 0, sizeof(unsigned) *10);

	/* setup the DSP reset vector */
	writel(DAVINCI_L3CBARAM_BASE, HOST1CFG);

	dsp_lpsc_on(1, DAVINCI_LPSC_GEM);
	val = readl(PSC0_MDCTL + (15 * 4));
	val \|= 0x100;
	writel(val, (PSC0_MDCTL + (15 * 4)));
	}

	int misc_init_r(void)
	{
	dspwake();
	return 0;
	}

	static const struct pinmux_config gpio_pins[] = {
	#ifdef CONFIG_USE_NOR
	/* GP0[11] is required for NOR to work on Rev 3 EVMs */
	{ pinmux(0), 8, 4 }, /* GP0[11] */
	#endif
	};

	static const struct pinmux_resource pinmuxes[] = {
	#ifdef CONFIG_DRIVER_TI_EMAC
	PINMUX_ITEM(emac_pins_mdio),
	#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
	PINMUX_ITEM(emac_pins_rmii),
	#else
	PINMUX_ITEM(emac_pins_mii),
	#endif
	#endif
	#ifdef CONFIG_SPI_FLASH
	PINMUX_ITEM(spi1_pins_base),
	PINMUX_ITEM(spi1_pins_scs0),
	#endif
	PINMUX_ITEM(uart2_pins_txrx),
	PINMUX_ITEM(uart2_pins_rtscts),
	PINMUX_ITEM(i2c0_pins),
	#ifdef CONFIG_NAND_DAVINCI
	PINMUX_ITEM(emifa_pins_cs3),
	PINMUX_ITEM(emifa_pins_cs4),
	PINMUX_ITEM(emifa_pins_nand),
	#elif defined(CONFIG_USE_NOR)
	PINMUX_ITEM(emifa_pins_cs2),
	PINMUX_ITEM(emifa_pins_nor),
	#endif
	PINMUX_ITEM(gpio_pins),
	};

	static const struct lpsc_resource lpsc[] = {
	{ DAVINCI_LPSC_AEMIF }, /* NAND, NOR */
	{ DAVINCI_LPSC_SPI1 }, /* Serial Flash */
	{ DAVINCI_LPSC_EMAC }, /* image download */
	{ DAVINCI_LPSC_UART2 }, /* console */
	{ DAVINCI_LPSC_GPIO },
	};

	#ifndef CONFIG_DA850_EVM_MAX_CPU_CLK
	#define CONFIG_DA850_EVM_MAX_CPU_CLK 300000000
	#endif

	#define REV_AM18X_EVM 0x100

	/*
	* get_board_rev() - setup to pass kernel board revision information
	* Returns:
	* bit[0-3] Maximum cpu clock rate supported by onboard SoC
	* 0000b - 300 MHz
	* 0001b - 372 MHz
	* 0010b - 408 MHz
	* 0011b - 456 MHz
	*/
	u32 get_board_rev(void)
	{
	char *s;
	u32 maxcpuclk = CONFIG_DA850_EVM_MAX_CPU_CLK;
	u32 rev = 0;

	s = getenv("maxcpuclk");
	if (s)
	maxcpuclk = simple_strtoul(s, NULL, 10);

	if (maxcpuclk >= 456000000)
	rev = 3;
	else if (maxcpuclk >= 408000000)
	rev = 2;
	else if (maxcpuclk >= 372000000)
	rev = 1;
	#ifdef CONFIG_DA850_AM18X_EVM
	rev \|= REV_AM18X_EVM;
	#endif
	return rev;
	}

	int board_early_init_f(void)
	{
	/*
	* Power on required peripherals
	* ARM does not have access by default to PSC0 and PSC1
	* assuming here that the DSP bootloader has set the IOPU
	* such that PSC access is available to ARM
	*/
	if (da8xx_configure_lpsc_items(lpsc, ARRAY_SIZE(lpsc)))
	return 1;

	return 0;
	}

	int board_init(void)
	{
	#ifdef CONFIG_USE_NOR
	u32 val;
	#endif

	#ifndef CONFIG_USE_IRQ
	irq_init();
	#endif

	#ifdef CONFIG_NAND_DAVINCI
	/*
	* NAND CS setup - cycle counts based on da850evm NAND timings in the
	* Linux kernel @ 25MHz EMIFA
	*/
	writel((DAVINCI_ABCR_WSETUP(0) \|
	DAVINCI_ABCR_WSTROBE(1) \|
	DAVINCI_ABCR_WHOLD(0) \|
	DAVINCI_ABCR_RSETUP(0) \|
	DAVINCI_ABCR_RSTROBE(1) \|
	DAVINCI_ABCR_RHOLD(0) \|
	DAVINCI_ABCR_TA(1) \|
	DAVINCI_ABCR_ASIZE_8BIT),
	&davinci_emif_regs->ab2cr); /* CS3 */
	#endif

	/* arch number of the board */
	gd->bd->bi_arch_number = MACH_TYPE_DAVINCI_DA850_EVM;

	/* address of boot parameters */
	gd->bd->bi_boot_params = LINUX_BOOT_PARAM_ADDR;

	/* setup the SUSPSRC for ARM to control emulation suspend */
	writel(readl(&davinci_syscfg_regs->suspsrc) &
	~(DAVINCI_SYSCFG_SUSPSRC_EMAC \| DAVINCI_SYSCFG_SUSPSRC_I2C \|
	DAVINCI_SYSCFG_SUSPSRC_SPI1 \| DAVINCI_SYSCFG_SUSPSRC_TIMER0 \|
	DAVINCI_SYSCFG_SUSPSRC_UART2),
	&davinci_syscfg_regs->suspsrc);

	/* configure pinmux settings */
	if (davinci_configure_pin_mux_items(pinmuxes, ARRAY_SIZE(pinmuxes)))
	return 1;

	#ifdef CONFIG_USE_NOR
	/* Set the GPIO direction as output */
	clrbits_be32((u32 *)GPIO_BANK0_REG_DIR_ADDR, (0x01 << 11));

	/* Set the output as low */
	val = readl(GPIO_BANK0_REG_SET_ADDR);
	val \|= (0x01 << 11);
	writel(val, GPIO_BANK0_REG_CLR_ADDR);
	#endif

	#ifdef CONFIG_DRIVER_TI_EMAC
	davinci_emac_mii_mode_sel(HAS_RMII);
	#endif /* CONFIG_DRIVER_TI_EMAC */

	/* enable the console UART */
	writel((DAVINCI_UART_PWREMU_MGMT_FREE \| DAVINCI_UART_PWREMU_MGMT_URRST \|
	DAVINCI_UART_PWREMU_MGMT_UTRST),
	&davinci_uart2_ctrl_regs->pwremu_mgmt);

	return 0;
	}

	#ifdef CONFIG_DRIVER_TI_EMAC

	#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 /* CONFIG_DRIVER_TI_EMAC_USE_RMII */

	/*
	* Initializes on-board ethernet controllers.
	*/
	int board_eth_init(bd_t *bis)
	{
	#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII
	/* Select RMII fucntion through the expander */
	if (rmii_hw_init())
	printf("RMII hardware init failed!!!\n");
	#endif
	if (!davinci_emac_initialize()) {
	printf("Error: Ethernet init failed!\n");
	return -1;
	}

	return 0;
	}
	#endif /* CONFIG_DRIVER_TI_EMAC */