/*
 * This file is part of the coreboot project.
 *
 * Copyright 2014 Rockchip 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.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <boot/coreboot_tables.h>
#include <console/console.h>
#include <gpio.h>
#include <string.h>
#include <vendorcode/google/chromeos/chromeos.h>

#include "board.h"

#define GPIO_WP		GPIO(7, A, 6)
#define GPIO_POWER	GPIO(0, A, 5)
#define GPIO_RECOVERY_SERVO	GPIO(0, B, 1)
#define GPIO_RECOVERY_PUSHKEY	GPIO(7, B, 1)
#define GPIO_DEVELOPER_SWITCH	GPIO(7, B, 2)


void setup_chromeos_gpios(void)
{
	gpio_input(GPIO_WP);
	gpio_input(GPIO_POWER);
	gpio_input_pullup(GPIO_RECOVERY_SERVO);
	gpio_input_pullup(GPIO_RECOVERY_PUSHKEY);
	gpio_input(GPIO_DEVELOPER_SWITCH);  // board has pull up/down resistor.
}

void fill_lb_gpios(struct lb_gpios *gpios)
{
	int count = 0;

	/* Write Protect: active low */
	gpios->gpios[count].port = GPIO_WP.raw;
	gpios->gpios[count].polarity = ACTIVE_LOW;
	gpios->gpios[count].value = gpio_get(GPIO_WP);
	strncpy((char *)gpios->gpios[count].name, "write protect",
		GPIO_MAX_NAME_LENGTH);
	count++;

	/* Recovery: active low */
	/* Note for early development, we want to support both servo and
	 * pushkey recovery buttons in firmware boot stages.
	 */
	gpios->gpios[count].port = GPIO_RECOVERY_PUSHKEY.raw;
	gpios->gpios[count].polarity = ACTIVE_LOW;
	gpios->gpios[count].value = !get_recovery_mode_switch();
	strncpy((char *)gpios->gpios[count].name, "recovery",
		GPIO_MAX_NAME_LENGTH);
	count++;

	/* Power Button: GPIO active low */
	gpios->gpios[count].port = GPIO_POWER.raw;
	gpios->gpios[count].polarity = ACTIVE_LOW;
	gpios->gpios[count].value = -1;
	strncpy((char *)gpios->gpios[count].name, "power",
		GPIO_MAX_NAME_LENGTH);
	count++;

	/* Developer: GPIO active high */
	gpios->gpios[count].port = GPIO_DEVELOPER_SWITCH.raw;
	gpios->gpios[count].polarity = ACTIVE_HIGH;
	gpios->gpios[count].value = get_developer_mode_switch();
	strncpy((char *)gpios->gpios[count].name, "developer",
		GPIO_MAX_NAME_LENGTH);
	count++;

	/* Reset: GPIO active high (output) */
	gpios->gpios[count].port = GPIO_RESET.raw;
	gpios->gpios[count].polarity = ACTIVE_HIGH;
	gpios->gpios[count].value = -1;
	strncpy((char *)gpios->gpios[count].name, "reset",
		GPIO_MAX_NAME_LENGTH);
	count++;

	gpios->size = sizeof(*gpios) + (count * sizeof(struct lb_gpio));
	gpios->count = count;

	printk(BIOS_ERR, "Added %d GPIOS size %d\n", count, gpios->size);
}

int get_developer_mode_switch(void)
{
	// GPIO_DEVELOPER_SWITCH is active high.
	return gpio_get(GPIO_DEVELOPER_SWITCH);
}

int get_recovery_mode_switch(void)
{
	// Both RECOVERY_SERVO and RECOVERY_PUSHKEY are low active.
	return !(gpio_get(GPIO_RECOVERY_SERVO) &&
		 gpio_get(GPIO_RECOVERY_PUSHKEY));
}

int get_write_protect_state(void)
{
	return !gpio_get(GPIO_WP);
}