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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 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 <bootmode.h>
#include <soc/gpio.h>
#include <vendorcode/google/chromeos/chromeos.h>
/* The WP status pin lives on GPIO_SSUS_6 which is pad 36 in the SUS well. */
#define WP_STATUS_PAD 36
#ifndef __PRE_RAM__
#include <boot/coreboot_tables.h>
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, 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
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. The
* hardware defaults to an input but there is a 20K pulldown. Externally
* there is a 10K pullup. Disable the internal pull in romstage so that
* there isn't any ambiguity in the reading.
*/
#if defined(__PRE_RAM__)
ssus_disable_internal_pull(WP_STATUS_PAD);
#endif
/* WP is enabled when the pin is reading high. */
return ssus_get_gpio(WP_STATUS_PAD);
}
static const struct cros_gpio cros_gpios[] = {
CROS_GPIO_REC_AL(CROS_GPIO_VIRTUAL, CROS_GPIO_DEVICE_NAME),
CROS_GPIO_WP_AH(0x2006, CROS_GPIO_DEVICE_NAME),
};
void mainboard_chromeos_acpi_generate(void)
{
chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
}
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