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/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*/
/* Implementation of per-board power management function */
#include <common.h>
#include <i2c.h>
#include <chromeos/common.h>
#include <chromeos/power_management.h>
#define PREFIX "cold_reboot: "
#define PMIC_I2C_BUS 0x00
#define PMIC_I2C_DEVICE_ADDRESS 0x34
#define TPS6586X_SUPPLYENE 0x14
extern uint32_t is_tegra2_processor_reset;
int is_processor_reset(void)
{
if (is_tegra2_processor_reset == ~0U) {
VBDEBUG(PREFIX "error: is_tegra2_processor_reset "
"uninitialized\n");
}
return is_tegra2_processor_reset ? 1 : 0;
}
/* This function never returns */
void cold_reboot(void)
{
uint8_t byte;
if (i2c_set_bus_num(PMIC_I2C_BUS)) {
VBDEBUG(PREFIX "i2c_set_bus_num fail\n");
goto FATAL;
}
if (i2c_read(PMIC_I2C_DEVICE_ADDRESS, TPS6586X_SUPPLYENE, 1,
&byte, sizeof(byte))) {
VBDEBUG(PREFIX "i2c_read fail\n");
goto FATAL;
}
/* Set TPS6586X_SUPPLYENE bit0 to 1 */
byte |= 1;
if (i2c_write(PMIC_I2C_DEVICE_ADDRESS, TPS6586X_SUPPLYENE, 1,
&byte, sizeof(byte))) {
VBDEBUG(PREFIX "i2c_write fail\n");
goto FATAL;
}
/* The PMIC will reboot the whole system after 10 ms */
udelay(100);
FATAL:
/* The final solution of doing a cold reboot */
printf("Please press cold reboot button\n");
while (1);
}
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