board/samsung/universal_c210/universal.c - github/trini/u-boot - Gitiles

 /*
  *  Copyright (C) 2010 Samsung Electronics
  *  Minkyu Kang <mk7.kang@samsung.com>
  *  Kyungmin Park <kyungmin.park@samsung.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <spi.h>
 #include <lcd.h>
 #include <asm/io.h>
 #include <asm/gpio.h>
 #include <asm/arch/adc.h>
 #include <asm/arch/pinmux.h>
 #include <asm/arch/watchdog.h>
 #include <ld9040.h>
 #include <power/pmic.h>
 #include <usb.h>
 #include <usb/s3c_udc.h>
 #include <asm/arch/cpu.h>
 #include <power/max8998_pmic.h>
 #include <libtizen.h>
 #include <samsung/misc.h>
 #include <usb_mass_storage.h>

 DECLARE_GLOBAL_DATA_PTR;

 unsigned int board_rev;

 u32 get_board_rev(void)
 {
 	return board_rev;
 }

 static int get_hwrev(void)
 {
 	return board_rev & 0xFF;
 }

 static void init_pmic_lcd(void);

 int exynos_power_init(void)
 {
 	int ret;

 	/*
 	 * For PMIC the I2C bus is named as I2C5, but it is connected
 	 * to logical I2C adapter 0
 	 */
 	ret = pmic_init(I2C_0);
 	if (ret)
 		return ret;

 	init_pmic_lcd();

 	return 0;
 }

 static unsigned short get_adc_value(int channel)
 {
 	struct s5p_adc *adc = (struct s5p_adc *)samsung_get_base_adc();
 	unsigned short ret = 0;
 	unsigned int reg;
 	unsigned int loop = 0;

 	writel(channel & 0xF, &adc->adcmux);
 	writel((1 << 14) | (49 << 6), &adc->adccon);
 	writel(1000 & 0xffff, &adc->adcdly);
 	writel(readl(&adc->adccon) | (1 << 16), &adc->adccon); /* 12 bit */
 	udelay(10);
 	writel(readl(&adc->adccon) | (1 << 0), &adc->adccon); /* Enable */
 	udelay(10);

 	do {
 		udelay(1);
 		reg = readl(&adc->adccon);
 	} while (!(reg & (1 << 15)) && (loop++ < 1000));

 	ret = readl(&adc->adcdat0) & 0xFFF;

 	return ret;
 }

 static int adc_power_control(int on)
 {
 	int ret;
 	struct pmic *p = pmic_get("MAX8998_PMIC");
 	if (!p)
 		return -ENODEV;

 	if (pmic_probe(p))
 		return -1;

 	ret = pmic_set_output(p,
 			      MAX8998_REG_ONOFF1,
 			      MAX8998_LDO4, !!on);

 	return ret;
 }

 static unsigned int get_hw_revision(void)
 {
 	int hwrev, mode0, mode1;

 	adc_power_control(1);

 	mode0 = get_adc_value(1);		/* HWREV_MODE0 */
 	mode1 = get_adc_value(2);		/* HWREV_MODE1 */

 	/*
 	 * XXX Always set the default hwrev as the latest board
 	 * ADC = (voltage) / 3.3 * 4096
 	 */
 	hwrev = 3;

 #define IS_RANGE(x, min, max)	((x) > (min) && (x) < (max))
 	if (IS_RANGE(mode0, 80, 200) && IS_RANGE(mode1, 80, 200))
 		hwrev = 0x0;		/* 0.01V	0.01V */
 	if (IS_RANGE(mode0, 750, 1000) && IS_RANGE(mode1, 80, 200))
 		hwrev = 0x1;		/* 610mV	0.01V */
 	if (IS_RANGE(mode0, 1300, 1700) && IS_RANGE(mode1, 80, 200))
 		hwrev = 0x2;		/* 1.16V	0.01V */
 	if (IS_RANGE(mode0, 2000, 2400) && IS_RANGE(mode1, 80, 200))
 		hwrev = 0x3;		/* 1.79V	0.01V */
 #undef IS_RANGE

 	debug("mode0: %d, mode1: %d, hwrev 0x%x\n", mode0, mode1, hwrev);

 	adc_power_control(0);

 	return hwrev;
 }

 static void check_hw_revision(void)
 {
 	int hwrev;

 	hwrev = get_hw_revision();

 	board_rev |= hwrev;
 }

 #ifdef CONFIG_USB_GADGET
 static int s5pc210_phy_control(int on)
 {
 	int ret = 0;
 	struct pmic *p = pmic_get("MAX8998_PMIC");
 	if (!p)
 		return -ENODEV;

 	if (pmic_probe(p))
 		return -1;

 	if (on) {
 		ret |= pmic_set_output(p,
 				       MAX8998_REG_BUCK_ACTIVE_DISCHARGE3,
 				       MAX8998_SAFEOUT1, LDO_ON);
 		ret |= pmic_set_output(p, MAX8998_REG_ONOFF1,
 				      MAX8998_LDO3, LDO_ON);
 		ret |= pmic_set_output(p, MAX8998_REG_ONOFF2,
 				      MAX8998_LDO8, LDO_ON);

 	} else {
 		ret |= pmic_set_output(p, MAX8998_REG_ONOFF2,
 				      MAX8998_LDO8, LDO_OFF);
 		ret |= pmic_set_output(p, MAX8998_REG_ONOFF1,
 				      MAX8998_LDO3, LDO_OFF);
 		ret |= pmic_set_output(p,
 				       MAX8998_REG_BUCK_ACTIVE_DISCHARGE3,
 				       MAX8998_SAFEOUT1, LDO_OFF);
 	}

 	if (ret) {
 		puts("MAX8998 LDO setting error!\n");
 		return -1;
 	}

 	return 0;
 }

 struct dwc2_plat_otg_data s5pc210_otg_data = {
 	.phy_control = s5pc210_phy_control,
 	.regs_phy = EXYNOS4_USBPHY_BASE,
 	.regs_otg = EXYNOS4_USBOTG_BASE,
 	.usb_phy_ctrl = EXYNOS4_USBPHY_CONTROL,
 	.usb_flags = PHY0_SLEEP,
 };
 #endif

 int board_usb_init(int index, enum usb_init_type init)
 {
 	debug("USB_udc_probe\n");
 	return dwc2_udc_probe(&s5pc210_otg_data);
 }

 int exynos_early_init_f(void)
 {
 	wdt_stop();

 	return 0;
 }

 static void init_pmic_lcd(void)
 {
 	unsigned char val;
 	int ret = 0;

 	struct pmic *p = pmic_get("MAX8998_PMIC");

 	if (!p)
 		return;

 	if (pmic_probe(p))
 		return;

 	/* LDO7 1.8V */
 	val = 0x02; /* (1800 - 1600) / 100; */
 	ret |= pmic_reg_write(p,  MAX8998_REG_LDO7, val);

 	/* LDO17 3.0V */
 	val = 0xe; /* (3000 - 1600) / 100; */
 	ret |= pmic_reg_write(p,  MAX8998_REG_LDO17, val);

 	/* Disable unneeded regulators */
 	/*
 	 * ONOFF1
 	 * Buck1 ON, Buck2 OFF, Buck3 ON, Buck4 ON
 	 * LDO2 ON, LDO3 OFF, LDO4 OFF, LDO5 ON
 	 */
 	val = 0xB9;
 	ret |= pmic_reg_write(p,  MAX8998_REG_ONOFF1, val);

 	/* ONOFF2
 	 * LDO6 OFF, LDO7 ON, LDO8 OFF, LDO9 ON,
 	 * LDO10 OFF, LDO11 OFF, LDO12 OFF, LDO13 OFF
 	 */
 	val = 0x50;
 	ret |= pmic_reg_write(p,  MAX8998_REG_ONOFF2, val);

 	/* ONOFF3
 	 * LDO14 OFF, LDO15 OFF, LGO16 OFF, LDO17 OFF
 	 * EPWRHOLD OFF, EBATTMON OFF, ELBCNFG2 OFF, ELBCNFG1 OFF
 	 */
 	val = 0x00;
 	ret |= pmic_reg_write(p,  MAX8998_REG_ONOFF3, val);

 	if (ret)
 		puts("LCD pmic initialisation error!\n");
 }

 void exynos_cfg_lcd_gpio(void)
 {
 	unsigned int i, f3_end = 4;

 	for (i = 0; i < 8; i++) {
 		/* set GPF0,1,2[0:7] for RGB Interface and Data lines (32bit) */
 		gpio_cfg_pin(EXYNOS4_GPIO_F00 + i, S5P_GPIO_FUNC(2));
 		gpio_cfg_pin(EXYNOS4_GPIO_F10 + i, S5P_GPIO_FUNC(2));
 		gpio_cfg_pin(EXYNOS4_GPIO_F20 + i, S5P_GPIO_FUNC(2));
 		/* pull-up/down disable */
 		gpio_set_pull(EXYNOS4_GPIO_F00 + i, S5P_GPIO_PULL_NONE);
 		gpio_set_pull(EXYNOS4_GPIO_F10 + i, S5P_GPIO_PULL_NONE);
 		gpio_set_pull(EXYNOS4_GPIO_F20 + i, S5P_GPIO_PULL_NONE);

 		/* drive strength to max (24bit) */
 		gpio_set_drv(EXYNOS4_GPIO_F00 + i, S5P_GPIO_DRV_4X);
 		gpio_set_rate(EXYNOS4_GPIO_F00 + i, S5P_GPIO_DRV_SLOW);
 		gpio_set_drv(EXYNOS4_GPIO_F10 + i, S5P_GPIO_DRV_4X);
 		gpio_set_rate(EXYNOS4_GPIO_F10 + i, S5P_GPIO_DRV_SLOW);
 		gpio_set_drv(EXYNOS4_GPIO_F20 + i, S5P_GPIO_DRV_4X);
 		gpio_set_rate(EXYNOS4_GPIO_F00 + i, S5P_GPIO_DRV_SLOW);
 	}

 	for (i = EXYNOS4_GPIO_F30; i < (EXYNOS4_GPIO_F30 + f3_end); i++) {
 		/* set GPF3[0:3] for RGB Interface and Data lines (32bit) */
 		gpio_cfg_pin(i, S5P_GPIO_FUNC(2));
 		/* pull-up/down disable */
 		gpio_set_pull(i, S5P_GPIO_PULL_NONE);
 		/* drive strength to max (24bit) */
 		gpio_set_drv(i, S5P_GPIO_DRV_4X);
 		gpio_set_rate(i, S5P_GPIO_DRV_SLOW);
 	}

 	/* gpio pad configuration for LCD reset. */
 	gpio_request(EXYNOS4_GPIO_Y45, "lcd_reset");
 	gpio_cfg_pin(EXYNOS4_GPIO_Y45, S5P_GPIO_OUTPUT);
 }

 int mipi_power(void)
 {
 	return 0;
 }

 void exynos_reset_lcd(void)
 {
 	gpio_set_value(EXYNOS4_GPIO_Y45, 1);
 	udelay(10000);
 	gpio_set_value(EXYNOS4_GPIO_Y45, 0);
 	udelay(10000);
 	gpio_set_value(EXYNOS4_GPIO_Y45, 1);
 	udelay(100);
 }

 void exynos_lcd_power_on(void)
 {
 	struct pmic *p = pmic_get("MAX8998_PMIC");

 	if (!p)
 		return;

 	if (pmic_probe(p))
 		return;

 	pmic_set_output(p, MAX8998_REG_ONOFF3, MAX8998_LDO17, LDO_ON);
 	pmic_set_output(p, MAX8998_REG_ONOFF2, MAX8998_LDO7, LDO_ON);
 }

 void exynos_cfg_ldo(void)
 {
 	ld9040_cfg_ldo();
 }

 void exynos_enable_ldo(unsigned int onoff)
 {
 	ld9040_enable_ldo(onoff);
 }

 int exynos_init(void)
 {
 	char buf[16];

 	gd->bd->bi_arch_number = MACH_TYPE_UNIVERSAL_C210;

 	switch (get_hwrev()) {
 	case 0:
 		/*
 		 * Set the low to enable LDO_EN
 		 * But when you use the test board for eMMC booting
 		 * you should set it HIGH since it removes the inverter
 		 */
 		/* MASSMEMORY_EN: XMDMDATA_6: GPE3[6] */
 		gpio_request(EXYNOS4_GPIO_E36, "ldo_en");
 		gpio_direction_output(EXYNOS4_GPIO_E36, 0);
 		break;
 	default:
 		/*
 		 * Default reset state is High and there's no inverter
 		 * But set it as HIGH to ensure
 		 */
 		/* MASSMEMORY_EN: XMDMADDR_3: GPE1[3] */
 		gpio_request(EXYNOS4_GPIO_E13, "massmemory_en");
 		gpio_direction_output(EXYNOS4_GPIO_E13, 1);
 		break;
 	}

 	/* Request soft I2C gpios */
 	sprintf(buf, "soft_i2c_scl");
 	gpio_request(CONFIG_SOFT_I2C_GPIO_SCL, buf);

 	sprintf(buf, "soft_i2c_sda");
 	gpio_request(CONFIG_SOFT_I2C_GPIO_SDA, buf);

 	check_hw_revision();
 	printf("HW Revision:\t0x%x\n", board_rev);

 	return 0;
 }

 void exynos_lcd_misc_init(vidinfo_t *vid)
 {
 #ifdef CONFIG_TIZEN
 	get_tizen_logo_info(vid);
 #endif

 	/* for LD9040. */
 	vid->pclk_name = 1;	/* MPLL */
 	vid->sclk_div = 1;

 	setenv("lcdinfo", "lcd=ld9040");
 }
	/*
	* Copyright (C) 2010 Samsung Electronics
	* Minkyu Kang <mk7.kang@samsung.com>
	* Kyungmin Park <kyungmin.park@samsung.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <spi.h>
	#include <lcd.h>
	#include <asm/io.h>
	#include <asm/gpio.h>
	#include <asm/arch/adc.h>
	#include <asm/arch/pinmux.h>
	#include <asm/arch/watchdog.h>
	#include <ld9040.h>
	#include <power/pmic.h>
	#include <usb.h>
	#include <usb/s3c_udc.h>
	#include <asm/arch/cpu.h>
	#include <power/max8998_pmic.h>
	#include <libtizen.h>
	#include <samsung/misc.h>
	#include <usb_mass_storage.h>

	DECLARE_GLOBAL_DATA_PTR;

	unsigned int board_rev;

	u32 get_board_rev(void)
	{
	return board_rev;
	}

	static int get_hwrev(void)
	{
	return board_rev & 0xFF;
	}

	static void init_pmic_lcd(void);

	int exynos_power_init(void)
	{
	int ret;

	/*
	* For PMIC the I2C bus is named as I2C5, but it is connected
	* to logical I2C adapter 0
	*/
	ret = pmic_init(I2C_0);
	if (ret)
	return ret;

	init_pmic_lcd();

	return 0;
	}

	static unsigned short get_adc_value(int channel)
	{
	struct s5p_adc adc = (struct s5p_adc )samsung_get_base_adc();
	unsigned short ret = 0;
	unsigned int reg;
	unsigned int loop = 0;

	writel(channel & 0xF, &adc->adcmux);
	writel((1 << 14) \| (49 << 6), &adc->adccon);
	writel(1000 & 0xffff, &adc->adcdly);
	writel(readl(&adc->adccon) \| (1 << 16), &adc->adccon); /* 12 bit */
	udelay(10);
	writel(readl(&adc->adccon) \| (1 << 0), &adc->adccon); /* Enable */
	udelay(10);

	do {
	udelay(1);
	reg = readl(&adc->adccon);
	} while (!(reg & (1 << 15)) && (loop++ < 1000));

	ret = readl(&adc->adcdat0) & 0xFFF;

	return ret;
	}

	static int adc_power_control(int on)
	{
	int ret;
	struct pmic *p = pmic_get("MAX8998_PMIC");
	if (!p)
	return -ENODEV;

	if (pmic_probe(p))
	return -1;

	ret = pmic_set_output(p,
	MAX8998_REG_ONOFF1,
	MAX8998_LDO4, !!on);

	return ret;
	}

	static unsigned int get_hw_revision(void)
	{
	int hwrev, mode0, mode1;

	adc_power_control(1);

	mode0 = get_adc_value(1); /* HWREV_MODE0 */
	mode1 = get_adc_value(2); /* HWREV_MODE1 */

	/*
	* XXX Always set the default hwrev as the latest board
	* ADC = (voltage) / 3.3 * 4096
	*/
	hwrev = 3;

	#define IS_RANGE(x, min, max) ((x) > (min) && (x) < (max))
	if (IS_RANGE(mode0, 80, 200) && IS_RANGE(mode1, 80, 200))
	hwrev = 0x0; /* 0.01V 0.01V */
	if (IS_RANGE(mode0, 750, 1000) && IS_RANGE(mode1, 80, 200))
	hwrev = 0x1; /* 610mV 0.01V */
	if (IS_RANGE(mode0, 1300, 1700) && IS_RANGE(mode1, 80, 200))
	hwrev = 0x2; /* 1.16V 0.01V */
	if (IS_RANGE(mode0, 2000, 2400) && IS_RANGE(mode1, 80, 200))
	hwrev = 0x3; /* 1.79V 0.01V */
	#undef IS_RANGE

	debug("mode0: %d, mode1: %d, hwrev 0x%x\n", mode0, mode1, hwrev);

	adc_power_control(0);

	return hwrev;
	}

	static void check_hw_revision(void)
	{
	int hwrev;

	hwrev = get_hw_revision();

	board_rev \|= hwrev;
	}

	#ifdef CONFIG_USB_GADGET
	static int s5pc210_phy_control(int on)
	{
	int ret = 0;
	struct pmic *p = pmic_get("MAX8998_PMIC");
	if (!p)
	return -ENODEV;

	if (pmic_probe(p))
	return -1;

	if (on) {
	ret \|= pmic_set_output(p,
	MAX8998_REG_BUCK_ACTIVE_DISCHARGE3,
	MAX8998_SAFEOUT1, LDO_ON);
	ret \|= pmic_set_output(p, MAX8998_REG_ONOFF1,
	MAX8998_LDO3, LDO_ON);
	ret \|= pmic_set_output(p, MAX8998_REG_ONOFF2,
	MAX8998_LDO8, LDO_ON);

	} else {
	ret \|= pmic_set_output(p, MAX8998_REG_ONOFF2,
	MAX8998_LDO8, LDO_OFF);
	ret \|= pmic_set_output(p, MAX8998_REG_ONOFF1,
	MAX8998_LDO3, LDO_OFF);
	ret \|= pmic_set_output(p,
	MAX8998_REG_BUCK_ACTIVE_DISCHARGE3,
	MAX8998_SAFEOUT1, LDO_OFF);
	}

	if (ret) {
	puts("MAX8998 LDO setting error!\n");
	return -1;
	}

	return 0;
	}

	struct dwc2_plat_otg_data s5pc210_otg_data = {
	.phy_control = s5pc210_phy_control,
	.regs_phy = EXYNOS4_USBPHY_BASE,
	.regs_otg = EXYNOS4_USBOTG_BASE,
	.usb_phy_ctrl = EXYNOS4_USBPHY_CONTROL,
	.usb_flags = PHY0_SLEEP,
	};
	#endif

	int board_usb_init(int index, enum usb_init_type init)
	{
	debug("USB_udc_probe\n");
	return dwc2_udc_probe(&s5pc210_otg_data);
	}

	int exynos_early_init_f(void)
	{
	wdt_stop();

	return 0;
	}

	static void init_pmic_lcd(void)
	{
	unsigned char val;
	int ret = 0;

	struct pmic *p = pmic_get("MAX8998_PMIC");

	if (!p)
	return;

	if (pmic_probe(p))
	return;

	/* LDO7 1.8V */
	val = 0x02; /* (1800 - 1600) / 100; */
	ret \|= pmic_reg_write(p, MAX8998_REG_LDO7, val);

	/* LDO17 3.0V */
	val = 0xe; /* (3000 - 1600) / 100; */
	ret \|= pmic_reg_write(p, MAX8998_REG_LDO17, val);

	/* Disable unneeded regulators */
	/*
	* ONOFF1
	* Buck1 ON, Buck2 OFF, Buck3 ON, Buck4 ON
	* LDO2 ON, LDO3 OFF, LDO4 OFF, LDO5 ON
	*/
	val = 0xB9;
	ret \|= pmic_reg_write(p, MAX8998_REG_ONOFF1, val);

	/* ONOFF2
	* LDO6 OFF, LDO7 ON, LDO8 OFF, LDO9 ON,
	* LDO10 OFF, LDO11 OFF, LDO12 OFF, LDO13 OFF
	*/
	val = 0x50;
	ret \|= pmic_reg_write(p, MAX8998_REG_ONOFF2, val);

	/* ONOFF3
	* LDO14 OFF, LDO15 OFF, LGO16 OFF, LDO17 OFF
	* EPWRHOLD OFF, EBATTMON OFF, ELBCNFG2 OFF, ELBCNFG1 OFF
	*/
	val = 0x00;
	ret \|= pmic_reg_write(p, MAX8998_REG_ONOFF3, val);

	if (ret)
	puts("LCD pmic initialisation error!\n");
	}

	void exynos_cfg_lcd_gpio(void)
	{
	unsigned int i, f3_end = 4;

	for (i = 0; i < 8; i++) {
	/* set GPF0,1,2[0:7] for RGB Interface and Data lines (32bit) */
	gpio_cfg_pin(EXYNOS4_GPIO_F00 + i, S5P_GPIO_FUNC(2));
	gpio_cfg_pin(EXYNOS4_GPIO_F10 + i, S5P_GPIO_FUNC(2));
	gpio_cfg_pin(EXYNOS4_GPIO_F20 + i, S5P_GPIO_FUNC(2));
	/* pull-up/down disable */
	gpio_set_pull(EXYNOS4_GPIO_F00 + i, S5P_GPIO_PULL_NONE);
	gpio_set_pull(EXYNOS4_GPIO_F10 + i, S5P_GPIO_PULL_NONE);
	gpio_set_pull(EXYNOS4_GPIO_F20 + i, S5P_GPIO_PULL_NONE);

	/* drive strength to max (24bit) */
	gpio_set_drv(EXYNOS4_GPIO_F00 + i, S5P_GPIO_DRV_4X);
	gpio_set_rate(EXYNOS4_GPIO_F00 + i, S5P_GPIO_DRV_SLOW);
	gpio_set_drv(EXYNOS4_GPIO_F10 + i, S5P_GPIO_DRV_4X);
	gpio_set_rate(EXYNOS4_GPIO_F10 + i, S5P_GPIO_DRV_SLOW);
	gpio_set_drv(EXYNOS4_GPIO_F20 + i, S5P_GPIO_DRV_4X);
	gpio_set_rate(EXYNOS4_GPIO_F00 + i, S5P_GPIO_DRV_SLOW);
	}

	for (i = EXYNOS4_GPIO_F30; i < (EXYNOS4_GPIO_F30 + f3_end); i++) {
	/* set GPF3[0:3] for RGB Interface and Data lines (32bit) */
	gpio_cfg_pin(i, S5P_GPIO_FUNC(2));
	/* pull-up/down disable */
	gpio_set_pull(i, S5P_GPIO_PULL_NONE);
	/* drive strength to max (24bit) */
	gpio_set_drv(i, S5P_GPIO_DRV_4X);
	gpio_set_rate(i, S5P_GPIO_DRV_SLOW);
	}

	/* gpio pad configuration for LCD reset. */
	gpio_request(EXYNOS4_GPIO_Y45, "lcd_reset");
	gpio_cfg_pin(EXYNOS4_GPIO_Y45, S5P_GPIO_OUTPUT);
	}

	int mipi_power(void)
	{
	return 0;
	}

	void exynos_reset_lcd(void)
	{
	gpio_set_value(EXYNOS4_GPIO_Y45, 1);
	udelay(10000);
	gpio_set_value(EXYNOS4_GPIO_Y45, 0);
	udelay(10000);
	gpio_set_value(EXYNOS4_GPIO_Y45, 1);
	udelay(100);
	}

	void exynos_lcd_power_on(void)
	{
	struct pmic *p = pmic_get("MAX8998_PMIC");

	if (!p)
	return;

	if (pmic_probe(p))
	return;

	pmic_set_output(p, MAX8998_REG_ONOFF3, MAX8998_LDO17, LDO_ON);
	pmic_set_output(p, MAX8998_REG_ONOFF2, MAX8998_LDO7, LDO_ON);
	}

	void exynos_cfg_ldo(void)
	{
	ld9040_cfg_ldo();
	}

	void exynos_enable_ldo(unsigned int onoff)
	{
	ld9040_enable_ldo(onoff);
	}

	int exynos_init(void)
	{
	char buf[16];

	gd->bd->bi_arch_number = MACH_TYPE_UNIVERSAL_C210;

	switch (get_hwrev()) {
	case 0:
	/*
	* Set the low to enable LDO_EN
	* But when you use the test board for eMMC booting
	* you should set it HIGH since it removes the inverter
	*/
	/* MASSMEMORY_EN: XMDMDATA_6: GPE3[6] */
	gpio_request(EXYNOS4_GPIO_E36, "ldo_en");
	gpio_direction_output(EXYNOS4_GPIO_E36, 0);
	break;
	default:
	/*
	* Default reset state is High and there's no inverter
	* But set it as HIGH to ensure
	*/
	/* MASSMEMORY_EN: XMDMADDR_3: GPE1[3] */
	gpio_request(EXYNOS4_GPIO_E13, "massmemory_en");
	gpio_direction_output(EXYNOS4_GPIO_E13, 1);
	break;
	}

	/* Request soft I2C gpios */
	sprintf(buf, "soft_i2c_scl");
	gpio_request(CONFIG_SOFT_I2C_GPIO_SCL, buf);

	sprintf(buf, "soft_i2c_sda");
	gpio_request(CONFIG_SOFT_I2C_GPIO_SDA, buf);

	check_hw_revision();
	printf("HW Revision:\t0x%x\n", board_rev);

	return 0;
	}

	void exynos_lcd_misc_init(vidinfo_t *vid)
	{
	#ifdef CONFIG_TIZEN
	get_tizen_logo_info(vid);
	#endif

	/* for LD9040. */
	vid->pclk_name = 1; /* MPLL */
	vid->sclk_div = 1;

	setenv("lcdinfo", "lcd=ld9040");
	}