/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2013 Google Inc.
 * Copyright (C) 2015 Intel Corp.
 *
 * 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/io.h>
#include <device/device.h>
#include <device/pci.h>

#if IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC)
#include "ec.h"
#include <ec/google/chromeec/ec.h>
#endif
#include <rules.h>
#include <gpio.h>
#include <string.h>
#include <vendorcode/google/chromeos/chromeos.h>

#define WP_GPIO	GP_E_22

#if ENV_RAMSTAGE
#include <boot/coreboot_tables.h>

#define ACTIVE_LOW	0
#define ACTIVE_HIGH	1

void fill_lb_gpios(struct lb_gpios *gpios)
{
	struct lb_gpio chromeos_gpios[] = {
		{-1, ACTIVE_HIGH, get_write_protect_state(), "write protect"},
		{-1, ACTIVE_HIGH, vboot_recovery_mode_enabled(), "recovery"},
		{-1, ACTIVE_HIGH, get_developer_mode_switch(), "developer"},
		{-1, ACTIVE_HIGH, get_lid_switch(), "lid"},
		{-1, ACTIVE_HIGH, 0, "power"},
		{-1, ACTIVE_HIGH, gfx_get_init_done(), "oprom"},
	};
	lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios));
}
#endif /* ENV_RAMSTAGE */

int get_lid_switch(void)
{
#if IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC)
	u8 ec_switches;

	mec_io_bytes(0, EC_LPC_ADDR_MEMMAP + EC_MEMMAP_SWITCHES, 1,
		     &ec_switches, NULL);

	return !!(ec_switches & EC_SWITCH_LID_OPEN);
#else
	/* Default to force open. */
	return 1;
#endif
}

int get_developer_mode_switch(void)
{
	return 0;
}

int get_recovery_mode_switch(void)
{
#if IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC)
	u8 ec_switches;
	u32 ec_events;
	mec_io_bytes(0, EC_LPC_ADDR_MEMMAP + EC_MEMMAP_SWITCHES, 1,
		     &ec_switches, NULL);

	/* If a switch is set, we don't need to look at events. */
	if (ec_switches & (EC_SWITCH_DEDICATED_RECOVERY))
		return 1;

	/* Else check if the EC has posted the keyboard recovery event. */
	ec_events = google_chromeec_get_events_b();

	return !!(ec_events &
		  EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY));
#else
	return 0;
#endif
}

int clear_recovery_mode_switch(void)
{
#if IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC)
	const uint32_t kb_rec_mask =
		EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY);
	/* Unconditionally clear the EC recovery request. */
	return google_chromeec_clear_events_b(kb_rec_mask);
#else
	return 0;
#endif
}

int get_write_protect_state(void)
{
	/*
	 * The vboot loader queries this function in romstage. The GPIOs have
	 * not been set up yet as that configuration is done in ramstage.
	 * Configuring this GPIO as input so that there isn't any ambiguity
	 * in the reading.
	 */
#if ENV_ROMSTAGE
	 gpio_input_pullup(WP_GPIO);
#endif

	/* WP is enabled when the pin is reading high. */
	return !!gpio_get(WP_GPIO);
}