system76-coreboot/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 <elog.h>
#include <gpio.h>
#include <soc/da9212.h>
#include <soc/i2c.h>
#include <soc/mt6311.h>
#include <soc/mt6391.h>
#include <soc/mtcmos.h>
#include <soc/pinmux.h>
#include <soc/pll.h>
#include <soc/usb.h>
#include <vendorcode/google/chromeos/chromeos.h>

enum {
	CODEC_I2C_BUS = 0,
	EXT_BUCK_I2C_BUS = 1,
};

static void configure_ext_buck(void)
{
	mtk_i2c_bus_init(EXT_BUCK_I2C_BUS);

	switch (board_id()) {
	case 3:
	case 4:
		/* rev-3 and rev-4 use mt6311 as external buck */
		gpio_output(PAD_EINT15, 1);
		udelay(500);
		mt6311_probe(EXT_BUCK_I2C_BUS);
		break;
	case 2:
	default:
		/* rev-2 and rev-5 use da9212 as external buck */
		mt6391_gpio_output(MT6391_KP_ROW3, 1); /* DA9212_IC_EN */
		mt6391_gpio_output(MT6391_KP_ROW4, 1); /* DA9212_EN_A */
		udelay(500);	/* add 500us delay for powering on da9212 */
		da9212_probe(EXT_BUCK_I2C_BUS);
		break;
	}
}

static void configure_audio(void)
{
	mtcmos_audio_power_on();

	/* 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);

	/* reset ALC5676 */
	if (board_id() < 5)
		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);
	if (board_id() >= 5)
		gpio_set_mode(PAD_UCTS0, PAD_UCTS0_FUNC_I2S2_DI_1);

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

	/* Init i2c bus Timing register for audio codecs */
	mtk_i2c_bus_init(CODEC_I2C_BUS);

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

static void configure_usb(void)
{
	setup_usb_host();

	if (board_id() > 3) {
		/* Enable current limit */
		gpio_output(PAD_CM2MCLK, 1);
		/* Configure USB OC pins*/
		gpio_input_pullup(PAD_MSDC3_DSL);
		gpio_input_pullup(PAD_CMPCLK);
		gpio_input_pullup(PAD_PCM_SYNC);
	}

	if (board_id() > 4) {
		/* USB 2.0 type A port over current interrupt pin(low active) */
		gpio_input_pullup(PAD_UCTS2);
		/* USB 2.0 type A port BC1.2 STATUS(low active) */
		gpio_input_pullup(PAD_AUD_DAT_MISO);
	}
}

static void configure_usb_hub(void)
{
	/* set usb hub reset pin (low active) to high */
	if (board_id() > 4)
		gpio_output(PAD_UTXD3, 1);
}

/* Setup backlight control pins as output pin and power-off by default */
static void configure_backlight(void)
{
	/* Configure PANEL_LCD_POWER_EN */
	switch (board_id()) {
	case 1:
	case 2:
		break;
	case 3:
		gpio_output(PAD_UCTS2, 0);
		break;
	case 4:
		gpio_output(PAD_SRCLKENAI, 0);
		break;
	default:
		gpio_output(PAD_UTXD2, 0);
		break;
	}

	gpio_output(PAD_DISP_PWM0, 0);	/* DISP_PWM0 */
	gpio_output(PAD_PCM_TX, 0);	/* PANEL_POWER_EN */
}

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.
	 */
	if (board_id() < 5)
		mt6391_gpio_output(MT6391_KP_ROW2, 1);

	/* Config SD card detection pin */
	gpio_input(PAD_EINT1); /* SD_DET */

	configure_audio();
	configure_backlight();
	configure_usb();
	configure_usb_hub();
	configure_ext_buck();

	elog_init();
	elog_add_watchdog_reset();
	elog_add_boot_reason();
}

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

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