board/ti/dra7xx/evm.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2013
  * Texas Instruments Incorporated, <www.ti.com>
  *
  * Lokesh Vutla <lokeshvutla@ti.com>
  *
  * Based on previous work by:
  * Aneesh V       <aneesh@ti.com>
  * Steve Sakoman  <steve@sakoman.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <common.h>
 #include <palmas.h>
 #include <sata.h>
 #include <asm/gpio.h>
 #include <usb.h>
 #include <linux/usb/gadget.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/dra7xx_iodelay.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/mmc_host_def.h>
 #include <asm/arch/sata.h>
 #include <environment.h>
 #include <dwc3-uboot.h>
 #include <dwc3-omap-uboot.h>
 #include <ti-usb-phy-uboot.h>

 #include "mux_data.h"

 #ifdef CONFIG_DRIVER_TI_CPSW
 #include <cpsw.h>
 #endif

 DECLARE_GLOBAL_DATA_PTR;

 /* GPIO 7_11 */
 #define GPIO_DDR_VTT_EN 203

 const struct omap_sysinfo sysinfo = {
 	"Board: DRA7xx\n"
 };

 /**
  * @brief board_init
  *
  * @return 0
  */
 int board_init(void)
 {
 	gpmc_init();
 	gd->bd->bi_boot_params = (0x80000000 + 0x100); /* boot param addr */

 	return 0;
 }

 int board_late_init(void)
 {
 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 	u32 id[4];

 	if (omap_revision() == DRA722_ES1_0)
 		setenv("board_name", "dra72x");
 	else
 		setenv("board_name", "dra7xx");

 	id[0] = readl((*ctrl)->control_std_fuse_die_id_0);
 	id[1] = readl((*ctrl)->control_std_fuse_die_id_1);
 	usb_set_serial_num_from_die_id(id);
 #endif
 	return 0;
 }

 void set_muxconf_regs_essential(void)
 {
 	do_set_mux32((*ctrl)->control_padconf_core_base,
 		     early_padconf, ARRAY_SIZE(early_padconf));
 }

 #ifdef CONFIG_IODELAY_RECALIBRATION
 void recalibrate_iodelay(void)
 {
 	struct pad_conf_entry const *pads;
 	struct iodelay_cfg_entry const *iodelay;
 	int npads, niodelays;

 	switch (omap_revision()) {
 	case DRA722_ES1_0:
 		pads = core_padconf_array_essential;
 		npads = ARRAY_SIZE(core_padconf_array_essential);
 		iodelay = iodelay_cfg_array;
 		niodelays = ARRAY_SIZE(iodelay_cfg_array);
 		break;
 	case DRA752_ES1_0:
 	case DRA752_ES1_1:
 		pads = dra74x_core_padconf_array;
 		npads = ARRAY_SIZE(dra74x_core_padconf_array);
 		iodelay = dra742_es1_1_iodelay_cfg_array;
 		niodelays = ARRAY_SIZE(dra742_es1_1_iodelay_cfg_array);
 		break;
 	default:
 	case DRA752_ES2_0:
 		pads = dra74x_core_padconf_array;
 		npads = ARRAY_SIZE(dra74x_core_padconf_array);
 		iodelay = dra742_es2_0_iodelay_cfg_array;
 		niodelays = ARRAY_SIZE(dra742_es2_0_iodelay_cfg_array);
 		/* Setup port1 and port2 for rgmii with 'no-id' mode */
 		clrset_spare_register(1, 0, RGMII2_ID_MODE_N_MASK |
 				      RGMII1_ID_MODE_N_MASK);
 		break;
 	}
 	__recalibrate_iodelay(pads, npads, iodelay, niodelays);
 }
 #endif

 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_GENERIC_MMC)
 int board_mmc_init(bd_t *bis)
 {
 	omap_mmc_init(0, 0, 0, -1, -1);
 	omap_mmc_init(1, 0, 0, -1, -1);
 	return 0;
 }
 #endif

 #ifdef CONFIG_USB_DWC3
 static struct dwc3_device usb_otg_ss1 = {
 	.maximum_speed = USB_SPEED_SUPER,
 	.base = DRA7_USB_OTG_SS1_BASE,
 	.tx_fifo_resize = false,
 	.index = 0,
 };

 static struct dwc3_omap_device usb_otg_ss1_glue = {
 	.base = (void *)DRA7_USB_OTG_SS1_GLUE_BASE,
 	.utmi_mode = DWC3_OMAP_UTMI_MODE_SW,
 	.index = 0,
 };

 static struct ti_usb_phy_device usb_phy1_device = {
 	.pll_ctrl_base = (void *)DRA7_USB3_PHY1_PLL_CTRL,
 	.usb2_phy_power = (void *)DRA7_USB2_PHY1_POWER,
 	.usb3_phy_power = (void *)DRA7_USB3_PHY1_POWER,
 	.index = 0,
 };

 static struct dwc3_device usb_otg_ss2 = {
 	.maximum_speed = USB_SPEED_SUPER,
 	.base = DRA7_USB_OTG_SS2_BASE,
 	.tx_fifo_resize = false,
 	.index = 1,
 };

 static struct dwc3_omap_device usb_otg_ss2_glue = {
 	.base = (void *)DRA7_USB_OTG_SS2_GLUE_BASE,
 	.utmi_mode = DWC3_OMAP_UTMI_MODE_SW,
 	.index = 1,
 };

 static struct ti_usb_phy_device usb_phy2_device = {
 	.usb2_phy_power = (void *)DRA7_USB2_PHY2_POWER,
 	.index = 1,
 };

 int board_usb_init(int index, enum usb_init_type init)
 {
 	enable_usb_clocks(index);
 	switch (index) {
 	case 0:
 		if (init == USB_INIT_DEVICE) {
 			usb_otg_ss1.dr_mode = USB_DR_MODE_PERIPHERAL;
 			usb_otg_ss1_glue.vbus_id_status = OMAP_DWC3_VBUS_VALID;
 		} else {
 			usb_otg_ss1.dr_mode = USB_DR_MODE_HOST;
 			usb_otg_ss1_glue.vbus_id_status = OMAP_DWC3_ID_GROUND;
 		}

 		ti_usb_phy_uboot_init(&usb_phy1_device);
 		dwc3_omap_uboot_init(&usb_otg_ss1_glue);
 		dwc3_uboot_init(&usb_otg_ss1);
 		break;
 	case 1:
 		if (init == USB_INIT_DEVICE) {
 			usb_otg_ss2.dr_mode = USB_DR_MODE_PERIPHERAL;
 			usb_otg_ss2_glue.vbus_id_status = OMAP_DWC3_VBUS_VALID;
 		} else {
 			usb_otg_ss2.dr_mode = USB_DR_MODE_HOST;
 			usb_otg_ss2_glue.vbus_id_status = OMAP_DWC3_ID_GROUND;
 		}

 		ti_usb_phy_uboot_init(&usb_phy2_device);
 		dwc3_omap_uboot_init(&usb_otg_ss2_glue);
 		dwc3_uboot_init(&usb_otg_ss2);
 		break;
 	default:
 		printf("Invalid Controller Index\n");
 	}

 	return 0;
 }

 int board_usb_cleanup(int index, enum usb_init_type init)
 {
 	switch (index) {
 	case 0:
 	case 1:
 		ti_usb_phy_uboot_exit(index);
 		dwc3_uboot_exit(index);
 		dwc3_omap_uboot_exit(index);
 		break;
 	default:
 		printf("Invalid Controller Index\n");
 	}
 	disable_usb_clocks(index);
 	return 0;
 }

 int usb_gadget_handle_interrupts(int index)
 {
 	u32 status;

 	status = dwc3_omap_uboot_interrupt_status(index);
 	if (status)
 		dwc3_uboot_handle_interrupt(index);

 	return 0;
 }
 #endif

 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_OS_BOOT)
 int spl_start_uboot(void)
 {
 	/* break into full u-boot on 'c' */
 	if (serial_tstc() && serial_getc() == 'c')
 		return 1;

 #ifdef CONFIG_SPL_ENV_SUPPORT
 	env_init();
 	env_relocate_spec();
 	if (getenv_yesno("boot_os") != 1)
 		return 1;
 #endif

 	return 0;
 }
 #endif

 #ifdef CONFIG_DRIVER_TI_CPSW
 extern u32 *const omap_si_rev;

 static void cpsw_control(int enabled)
 {
 	/* VTP can be added here */

 	return;
 }

 static struct cpsw_slave_data cpsw_slaves[] = {
 	{
 		.slave_reg_ofs	= 0x208,
 		.sliver_reg_ofs	= 0xd80,
 		.phy_addr	= 2,
 	},
 	{
 		.slave_reg_ofs	= 0x308,
 		.sliver_reg_ofs	= 0xdc0,
 		.phy_addr	= 3,
 	},
 };

 static struct cpsw_platform_data cpsw_data = {
 	.mdio_base		= CPSW_MDIO_BASE,
 	.cpsw_base		= CPSW_BASE,
 	.mdio_div		= 0xff,
 	.channels		= 8,
 	.cpdma_reg_ofs		= 0x800,
 	.slaves			= 2,
 	.slave_data		= cpsw_slaves,
 	.ale_reg_ofs		= 0xd00,
 	.ale_entries		= 1024,
 	.host_port_reg_ofs	= 0x108,
 	.hw_stats_reg_ofs	= 0x900,
 	.bd_ram_ofs		= 0x2000,
 	.mac_control		= (1 << 5),
 	.control		= cpsw_control,
 	.host_port_num		= 0,
 	.version		= CPSW_CTRL_VERSION_2,
 };

 int board_eth_init(bd_t *bis)
 {
 	int ret;
 	uint8_t mac_addr[6];
 	uint32_t mac_hi, mac_lo;
 	uint32_t ctrl_val;

 	/* try reading mac address from efuse */
 	mac_lo = readl((*ctrl)->control_core_mac_id_0_lo);
 	mac_hi = readl((*ctrl)->control_core_mac_id_0_hi);
 	mac_addr[0] = (mac_hi & 0xFF0000) >> 16;
 	mac_addr[1] = (mac_hi & 0xFF00) >> 8;
 	mac_addr[2] = mac_hi & 0xFF;
 	mac_addr[3] = (mac_lo & 0xFF0000) >> 16;
 	mac_addr[4] = (mac_lo & 0xFF00) >> 8;
 	mac_addr[5] = mac_lo & 0xFF;

 	if (!getenv("ethaddr")) {
 		printf("<ethaddr> not set. Validating first E-fuse MAC\n");

 		if (is_valid_ethaddr(mac_addr))
 			eth_setenv_enetaddr("ethaddr", mac_addr);
 	}

 	mac_lo = readl((*ctrl)->control_core_mac_id_1_lo);
 	mac_hi = readl((*ctrl)->control_core_mac_id_1_hi);
 	mac_addr[0] = (mac_hi & 0xFF0000) >> 16;
 	mac_addr[1] = (mac_hi & 0xFF00) >> 8;
 	mac_addr[2] = mac_hi & 0xFF;
 	mac_addr[3] = (mac_lo & 0xFF0000) >> 16;
 	mac_addr[4] = (mac_lo & 0xFF00) >> 8;
 	mac_addr[5] = mac_lo & 0xFF;

 	if (!getenv("eth1addr")) {
 		if (is_valid_ethaddr(mac_addr))
 			eth_setenv_enetaddr("eth1addr", mac_addr);
 	}

 	ctrl_val = readl((*ctrl)->control_core_control_io1) & (~0x33);
 	ctrl_val |= 0x22;
 	writel(ctrl_val, (*ctrl)->control_core_control_io1);

 	if (*omap_si_rev == DRA722_ES1_0)
 		cpsw_data.active_slave = 1;

 	ret = cpsw_register(&cpsw_data);
 	if (ret < 0)
 		printf("Error %d registering CPSW switch\n", ret);

 	return ret;
 }
 #endif

 #ifdef CONFIG_BOARD_EARLY_INIT_F
 /* VTT regulator enable */
 static inline void vtt_regulator_enable(void)
 {
 	if (omap_hw_init_context() == OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL)
 		return;

 	/* Do not enable VTT for DRA722 */
 	if (omap_revision() == DRA722_ES1_0)
 		return;

 	/*
 	 * EVM Rev G and later use gpio7_11 for DDR3 termination.
 	 * This is safe enough to do on older revs.
 	 */
 	gpio_request(GPIO_DDR_VTT_EN, "ddr_vtt_en");
 	gpio_direction_output(GPIO_DDR_VTT_EN, 1);
 }

 int board_early_init_f(void)
 {
 	vtt_regulator_enable();
 	return 0;
 }
 #endif
	/*
	* (C) Copyright 2013
	* Texas Instruments Incorporated, <www.ti.com>
	*
	* Lokesh Vutla <lokeshvutla@ti.com>
	*
	* Based on previous work by:
	* Aneesh V <aneesh@ti.com>
	* Steve Sakoman <steve@sakoman.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/
	#include <common.h>
	#include <palmas.h>
	#include <sata.h>
	#include <asm/gpio.h>
	#include <usb.h>
	#include <linux/usb/gadget.h>
	#include <asm/arch/gpio.h>
	#include <asm/arch/dra7xx_iodelay.h>
	#include <asm/arch/sys_proto.h>
	#include <asm/arch/mmc_host_def.h>
	#include <asm/arch/sata.h>
	#include <environment.h>
	#include <dwc3-uboot.h>
	#include <dwc3-omap-uboot.h>
	#include <ti-usb-phy-uboot.h>

	#include "mux_data.h"

	#ifdef CONFIG_DRIVER_TI_CPSW
	#include <cpsw.h>
	#endif

	DECLARE_GLOBAL_DATA_PTR;

	/* GPIO 7_11 */
	#define GPIO_DDR_VTT_EN 203

	const struct omap_sysinfo sysinfo = {
	"Board: DRA7xx\n"
	};

	/**
	* @brief board_init
	*
	* @return 0
	*/
	int board_init(void)
	{
	gpmc_init();
	gd->bd->bi_boot_params = (0x80000000 + 0x100); /* boot param addr */

	return 0;
	}

	int board_late_init(void)
	{
	#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
	u32 id[4];

	if (omap_revision() == DRA722_ES1_0)
	setenv("board_name", "dra72x");
	else
	setenv("board_name", "dra7xx");

	id[0] = readl((*ctrl)->control_std_fuse_die_id_0);
	id[1] = readl((*ctrl)->control_std_fuse_die_id_1);
	usb_set_serial_num_from_die_id(id);
	#endif
	return 0;
	}

	void set_muxconf_regs_essential(void)
	{
	do_set_mux32((*ctrl)->control_padconf_core_base,
	early_padconf, ARRAY_SIZE(early_padconf));
	}

	#ifdef CONFIG_IODELAY_RECALIBRATION
	void recalibrate_iodelay(void)
	{
	struct pad_conf_entry const *pads;
	struct iodelay_cfg_entry const *iodelay;
	int npads, niodelays;

	switch (omap_revision()) {
	case DRA722_ES1_0:
	pads = core_padconf_array_essential;
	npads = ARRAY_SIZE(core_padconf_array_essential);
	iodelay = iodelay_cfg_array;
	niodelays = ARRAY_SIZE(iodelay_cfg_array);
	break;
	case DRA752_ES1_0:
	case DRA752_ES1_1:
	pads = dra74x_core_padconf_array;
	npads = ARRAY_SIZE(dra74x_core_padconf_array);
	iodelay = dra742_es1_1_iodelay_cfg_array;
	niodelays = ARRAY_SIZE(dra742_es1_1_iodelay_cfg_array);
	break;
	default:
	case DRA752_ES2_0:
	pads = dra74x_core_padconf_array;
	npads = ARRAY_SIZE(dra74x_core_padconf_array);
	iodelay = dra742_es2_0_iodelay_cfg_array;
	niodelays = ARRAY_SIZE(dra742_es2_0_iodelay_cfg_array);
	/* Setup port1 and port2 for rgmii with 'no-id' mode */
	clrset_spare_register(1, 0, RGMII2_ID_MODE_N_MASK \|
	RGMII1_ID_MODE_N_MASK);
	break;
	}
	__recalibrate_iodelay(pads, npads, iodelay, niodelays);
	}
	#endif

	#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_GENERIC_MMC)
	int board_mmc_init(bd_t *bis)
	{
	omap_mmc_init(0, 0, 0, -1, -1);
	omap_mmc_init(1, 0, 0, -1, -1);
	return 0;
	}
	#endif

	#ifdef CONFIG_USB_DWC3
	static struct dwc3_device usb_otg_ss1 = {
	.maximum_speed = USB_SPEED_SUPER,
	.base = DRA7_USB_OTG_SS1_BASE,
	.tx_fifo_resize = false,
	.index = 0,
	};

	static struct dwc3_omap_device usb_otg_ss1_glue = {
	.base = (void *)DRA7_USB_OTG_SS1_GLUE_BASE,
	.utmi_mode = DWC3_OMAP_UTMI_MODE_SW,
	.index = 0,
	};

	static struct ti_usb_phy_device usb_phy1_device = {
	.pll_ctrl_base = (void *)DRA7_USB3_PHY1_PLL_CTRL,
	.usb2_phy_power = (void *)DRA7_USB2_PHY1_POWER,
	.usb3_phy_power = (void *)DRA7_USB3_PHY1_POWER,
	.index = 0,
	};

	static struct dwc3_device usb_otg_ss2 = {
	.maximum_speed = USB_SPEED_SUPER,
	.base = DRA7_USB_OTG_SS2_BASE,
	.tx_fifo_resize = false,
	.index = 1,
	};

	static struct dwc3_omap_device usb_otg_ss2_glue = {
	.base = (void *)DRA7_USB_OTG_SS2_GLUE_BASE,
	.utmi_mode = DWC3_OMAP_UTMI_MODE_SW,
	.index = 1,
	};

	static struct ti_usb_phy_device usb_phy2_device = {
	.usb2_phy_power = (void *)DRA7_USB2_PHY2_POWER,
	.index = 1,
	};

	int board_usb_init(int index, enum usb_init_type init)
	{
	enable_usb_clocks(index);
	switch (index) {
	case 0:
	if (init == USB_INIT_DEVICE) {
	usb_otg_ss1.dr_mode = USB_DR_MODE_PERIPHERAL;
	usb_otg_ss1_glue.vbus_id_status = OMAP_DWC3_VBUS_VALID;
	} else {
	usb_otg_ss1.dr_mode = USB_DR_MODE_HOST;
	usb_otg_ss1_glue.vbus_id_status = OMAP_DWC3_ID_GROUND;
	}

	ti_usb_phy_uboot_init(&usb_phy1_device);
	dwc3_omap_uboot_init(&usb_otg_ss1_glue);
	dwc3_uboot_init(&usb_otg_ss1);
	break;
	case 1:
	if (init == USB_INIT_DEVICE) {
	usb_otg_ss2.dr_mode = USB_DR_MODE_PERIPHERAL;
	usb_otg_ss2_glue.vbus_id_status = OMAP_DWC3_VBUS_VALID;
	} else {
	usb_otg_ss2.dr_mode = USB_DR_MODE_HOST;
	usb_otg_ss2_glue.vbus_id_status = OMAP_DWC3_ID_GROUND;
	}

	ti_usb_phy_uboot_init(&usb_phy2_device);
	dwc3_omap_uboot_init(&usb_otg_ss2_glue);
	dwc3_uboot_init(&usb_otg_ss2);
	break;
	default:
	printf("Invalid Controller Index\n");
	}

	return 0;
	}

	int board_usb_cleanup(int index, enum usb_init_type init)
	{
	switch (index) {
	case 0:
	case 1:
	ti_usb_phy_uboot_exit(index);
	dwc3_uboot_exit(index);
	dwc3_omap_uboot_exit(index);
	break;
	default:
	printf("Invalid Controller Index\n");
	}
	disable_usb_clocks(index);
	return 0;
	}

	int usb_gadget_handle_interrupts(int index)
	{
	u32 status;

	status = dwc3_omap_uboot_interrupt_status(index);
	if (status)
	dwc3_uboot_handle_interrupt(index);

	return 0;
	}
	#endif

	#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_OS_BOOT)
	int spl_start_uboot(void)
	{
	/* break into full u-boot on 'c' */
	if (serial_tstc() && serial_getc() == 'c')
	return 1;

	#ifdef CONFIG_SPL_ENV_SUPPORT
	env_init();
	env_relocate_spec();
	if (getenv_yesno("boot_os") != 1)
	return 1;
	#endif

	return 0;
	}
	#endif

	#ifdef CONFIG_DRIVER_TI_CPSW
	extern u32 *const omap_si_rev;

	static void cpsw_control(int enabled)
	{
	/* VTP can be added here */

	return;
	}

	static struct cpsw_slave_data cpsw_slaves[] = {
	{
	.slave_reg_ofs = 0x208,
	.sliver_reg_ofs = 0xd80,
	.phy_addr = 2,
	},
	{
	.slave_reg_ofs = 0x308,
	.sliver_reg_ofs = 0xdc0,
	.phy_addr = 3,
	},
	};

	static struct cpsw_platform_data cpsw_data = {
	.mdio_base = CPSW_MDIO_BASE,
	.cpsw_base = CPSW_BASE,
	.mdio_div = 0xff,
	.channels = 8,
	.cpdma_reg_ofs = 0x800,
	.slaves = 2,
	.slave_data = cpsw_slaves,
	.ale_reg_ofs = 0xd00,
	.ale_entries = 1024,
	.host_port_reg_ofs = 0x108,
	.hw_stats_reg_ofs = 0x900,
	.bd_ram_ofs = 0x2000,
	.mac_control = (1 << 5),
	.control = cpsw_control,
	.host_port_num = 0,
	.version = CPSW_CTRL_VERSION_2,
	};

	int board_eth_init(bd_t *bis)
	{
	int ret;
	uint8_t mac_addr[6];
	uint32_t mac_hi, mac_lo;
	uint32_t ctrl_val;

	/* try reading mac address from efuse */
	mac_lo = readl((*ctrl)->control_core_mac_id_0_lo);
	mac_hi = readl((*ctrl)->control_core_mac_id_0_hi);
	mac_addr[0] = (mac_hi & 0xFF0000) >> 16;
	mac_addr[1] = (mac_hi & 0xFF00) >> 8;
	mac_addr[2] = mac_hi & 0xFF;
	mac_addr[3] = (mac_lo & 0xFF0000) >> 16;
	mac_addr[4] = (mac_lo & 0xFF00) >> 8;
	mac_addr[5] = mac_lo & 0xFF;

	if (!getenv("ethaddr")) {
	printf("<ethaddr> not set. Validating first E-fuse MAC\n");

	if (is_valid_ethaddr(mac_addr))
	eth_setenv_enetaddr("ethaddr", mac_addr);
	}

	mac_lo = readl((*ctrl)->control_core_mac_id_1_lo);
	mac_hi = readl((*ctrl)->control_core_mac_id_1_hi);
	mac_addr[0] = (mac_hi & 0xFF0000) >> 16;
	mac_addr[1] = (mac_hi & 0xFF00) >> 8;
	mac_addr[2] = mac_hi & 0xFF;
	mac_addr[3] = (mac_lo & 0xFF0000) >> 16;
	mac_addr[4] = (mac_lo & 0xFF00) >> 8;
	mac_addr[5] = mac_lo & 0xFF;

	if (!getenv("eth1addr")) {
	if (is_valid_ethaddr(mac_addr))
	eth_setenv_enetaddr("eth1addr", mac_addr);
	}

	ctrl_val = readl((*ctrl)->control_core_control_io1) & (~0x33);
	ctrl_val \|= 0x22;
	writel(ctrl_val, (*ctrl)->control_core_control_io1);

	if (*omap_si_rev == DRA722_ES1_0)
	cpsw_data.active_slave = 1;

	ret = cpsw_register(&cpsw_data);
	if (ret < 0)
	printf("Error %d registering CPSW switch\n", ret);

	return ret;
	}
	#endif

	#ifdef CONFIG_BOARD_EARLY_INIT_F
	/* VTT regulator enable */
	static inline void vtt_regulator_enable(void)
	{
	if (omap_hw_init_context() == OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL)
	return;

	/* Do not enable VTT for DRA722 */
	if (omap_revision() == DRA722_ES1_0)
	return;

	/*
	* EVM Rev G and later use gpio7_11 for DDR3 termination.
	* This is safe enough to do on older revs.
	*/
	gpio_request(GPIO_DDR_VTT_EN, "ddr_vtt_en");
	gpio_direction_output(GPIO_DDR_VTT_EN, 1);
	}

	int board_early_init_f(void)
	{
	vtt_regulator_enable();
	return 0;
	}
	#endif