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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google 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 <boardid.h>
#include <boot/coreboot_tables.h>
#include <console/console.h>
#include <delay.h>
#include <drivers/i2c/ww_ring/ww_ring.h>
#include <gpio.h>
#include <soc/cdp.h>
#include <soc/gsbi.h>
#include <timer.h>
#include <vendorcode/google/chromeos/chromeos.h>
#define DEV_SW 15
#define REC_SW 16
#define WP_SW 17
static int read_gpio(gpio_t gpio_num)
{
gpio_tlmm_config_set(gpio_num, GPIO_FUNC_DISABLE,
GPIO_NO_PULL, GPIO_2MA, GPIO_DISABLE);
udelay(10); /* Should be enough to settle. */
return gpio_get(gpio_num);
}
void fill_lb_gpios(struct lb_gpios *gpios)
{
struct lb_gpio chromeos_gpios[] = {
{REC_SW, ACTIVE_LOW, read_gpio(REC_SW), "recovery"},
{WP_SW, ACTIVE_LOW, !get_write_protect_state(),
"write protect"},
{-1, ACTIVE_LOW, 1, "power"},
{-1, ACTIVE_LOW, 0, "lid"},
};
lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios));
}
/*
* The recovery switch on storm is overloaded: it needs to be pressed for a
* certain duration at startup to signal different requests:
*
* - keeping it pressed for 8 to 16 seconds after startup signals the need for
* factory reset (wipeout);
* - keeping it pressed for longer than 16 seconds signals the need for Chrome
* OS recovery.
*
* The state is read once and cached for following inquiries. The below enum
* lists possible states.
*/
enum switch_state {
not_probed = -1,
no_req,
recovery_req,
wipeout_req
};
static void display_pattern(int pattern)
{
if (board_id() == BOARD_ID_WHIRLWIND_SP5)
ww_ring_display_pattern(GSBI_ID_7, pattern);
}
#define WIPEOUT_MODE_DELAY_MS (8 * 1000)
#define RECOVERY_MODE_EXTRA_DELAY_MS (8 * 1000)
static enum switch_state get_switch_state(void)
{
struct stopwatch sw;
int sampled_value;
static enum switch_state saved_state = not_probed;
if (saved_state != not_probed)
return saved_state;
sampled_value = !read_gpio(REC_SW);
if (!sampled_value) {
saved_state = no_req;
display_pattern(WWR_NORMAL_BOOT);
return saved_state;
}
display_pattern(WWR_RECOVERY_PUSHED);
printk(BIOS_INFO, "recovery button pressed\n");
stopwatch_init_msecs_expire(&sw, WIPEOUT_MODE_DELAY_MS);
do {
sampled_value = !read_gpio(REC_SW);
if (!sampled_value)
break;
} while (!stopwatch_expired(&sw));
if (sampled_value) {
display_pattern(WWR_WIPEOUT_REQUEST);
printk(BIOS_INFO, "wipeout requested, checking recovery\n");
stopwatch_init_msecs_expire(&sw, RECOVERY_MODE_EXTRA_DELAY_MS);
do {
sampled_value = !read_gpio(REC_SW);
if (!sampled_value)
break;
} while (!stopwatch_expired(&sw));
if (sampled_value) {
saved_state = recovery_req;
display_pattern(WWR_RECOVERY_REQUEST);
printk(BIOS_INFO, "recovery requested\n");
} else {
saved_state = wipeout_req;
}
} else {
saved_state = no_req;
display_pattern(WWR_NORMAL_BOOT);
}
return saved_state;
}
int get_recovery_mode_switch(void)
{
return get_switch_state() == recovery_req;
}
int get_wipeout_mode_switch(void)
{
return get_switch_state() == wipeout_req;
}
int get_write_protect_state(void)
{
return !read_gpio(WP_SW);
}
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