src/mainboard/google/oak/mainboard.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright 2015 MediaTek Inc.
 *
 * 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; version 2 of the License.
 *
 * 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.
 */

#include <arch/cache.h>
#include <arch/io.h>
#include <boardid.h>
#include <boot/coreboot_tables.h>
#include <delay.h>
#include <device/device.h>

#include <gpio.h>
#include <soc/mt6391.h>
#include <soc/mtcmos.h>
#include <soc/pinmux.h>
#include <soc/pll.h>
#include <soc/usb.h>

static void configure_audio(void)
{
	mtcmos_audio_power_on();

	/* regulator for codecs */
	switch (board_id()) {
	case 0:
		/* vgp1 set to 1.22V */
		mt6391_configure_ldo(LDO_VCAMD, LDO_1P22);
		/* vgp4 set to 1.8V */
		mt6391_configure_ldo(LDO_VGP4, LDO_1P8);
		break;
	default:
		/* board from Rev1 */
		/* vgp1 set to 1.8V */
		mt6391_configure_ldo(LDO_VCAMD, LDO_1P8);
		/* delay 1ms for realtek's power sequence request */
		mdelay(1);
		/* vcama set to 1.8V */
		mt6391_configure_ldo(LDO_VCAMA, LDO_1P8);
		break;
	}

	/* reset ALC5676 */
	gpio_output(PAD_LCM_RST, 1);

	/* SoC I2S */
	gpio_set_mode(PAD_I2S0_LRCK, PAD_I2S0_LRCK_FUNC_I2S1_WS);
	gpio_set_mode(PAD_I2S0_BCK, PAD_I2S0_BCK_FUNC_I2S1_BCK);
	gpio_set_mode(PAD_I2S0_MCK, PAD_I2S0_MCK_FUNC_I2S1_MCK);
	gpio_set_mode(PAD_I2S0_DATA0, PAD_I2S0_DATA0_FUNC_I2S1_DO_1);
	gpio_set_mode(PAD_I2S0_DATA1, PAD_I2S0_DATA1_FUNC_I2S2_DI_2);

	/* codec ext MCLK ON */
	mt6391_gpio_output(MT6391_KP_COL4, 1);
	mt6391_gpio_output(MT6391_KP_COL5, 1);

	/* set I2S clock to 48KHz */
	mt_pll_set_aud_div(48 * KHz);
}

static void configure_usb(void)
{
	setup_usb_host();

	if (board_id() > 3)
		gpio_output(PAD_CM2MCLK, 1);
}

/* Setup backlight control pins as output pin and power-off by default */
static void configure_backlight(void)
{
	switch (board_id()) {
	case 0:
		gpio_output(PAD_DISP_PWM0, 0); /* DISP_PWM0 */
		mt6391_gpio_output(MT6391_KP_ROW3, 0); /* PANEL_POWER_EN_6397 */
		break;
	case 1:
	case 2:
		gpio_output(PAD_DISP_PWM0, 0); /* DISP_PWM0 */
		gpio_output(PAD_PCM_TX, 0); /* PANEL_POWER_EN */
		break;
	case 3:
		gpio_output(PAD_UCTS2, 0); /* PANEL_LCD_POWER_EN */
		gpio_output(PAD_DISP_PWM0, 0); /* DISP_PWM0 */
		gpio_output(PAD_PCM_TX, 0); /* PANEL_POWER_EN */
		break;
	case 4:
	default:
		gpio_output(PAD_SRCLKENAI, 0); /* PANEL_LCD_POWER_EN */
		gpio_output(PAD_DISP_PWM0, 0); /* DISP_PWM0 */
		gpio_output(PAD_PCM_TX, 0); /* PANEL_POWER_EN */
		break;
	}
}

static void mainboard_init(device_t dev)
{
	/* TP_SHIFT_EN: Enables the level shifter for I2C bus 4 (TPAD), which
	 * also contains the PS8640 eDP brige and the USB hub.
	 */
	mt6391_gpio_output(MT6391_KP_ROW2, 1);

	configure_audio();
	configure_backlight();
	configure_usb();
}

static void mainboard_enable(device_t dev)
{
	dev->ops->init = &mainboard_init;
}

struct chip_operations mainboard_ops = {
	.name = "oak",
	.enable_dev = mainboard_enable,
};