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/* Copyright 2016 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.
*/
/* Apollolake chipset power control module for Chrome EC */
#include "apollolake.h"
#include "chipset.h"
#include "console.h"
#include "gpio.h"
#include "intel_x86.h"
#include "task.h"
#include "timer.h"
/* Console output macros */
#define CPRINTS(format, args...) cprints(CC_CHIPSET, format, ## args)
/*
* force_shutdown is used to maintain chipset shutdown request. This request
* needs to be handled from within the chipset task.
*/
static int force_shutdown;
__attribute__((weak)) void chipset_do_shutdown(void)
{
/* Need to implement board specific shutdown */
}
static void internal_chipset_shutdown(void)
{
/*
* UART buffer gets overwritten by other tasks if it is not explicitly
* flushed before printing it on the console by same task. Hence, clean
* up the UART buffer so that all the debug messages are printed on the
* UART console before doing shutdown.
*/
cflush();
CPRINTS("%s()", __func__);
force_shutdown = 0;
chipset_do_shutdown();
}
void chipset_force_shutdown(enum chipset_shutdown_reason reason)
{
CPRINTS("%s: %d", __func__, reason);
report_ap_reset(reason);
/*
* This function is called from multiple tasks and hence it is racy! But
* since things are going down hard, it does not matter if some task
* misses out.
*/
force_shutdown = 1;
task_wake(TASK_ID_CHIPSET);
}
enum power_state chipset_force_g3(void)
{
chipset_force_shutdown(CHIPSET_SHUTDOWN_G3);
return POWER_G3;
}
void chipset_handle_espi_reset_assert(void)
{
}
static void handle_all_sys_pgood(enum power_state state)
{
/*
* Pass through asynchronously, as SOC may not react
* immediately to power changes.
*/
int in_level = gpio_get_level(GPIO_ALL_SYS_PGOOD);
int out_level = gpio_get_level(GPIO_PCH_SYS_PWROK);
/* Nothing to do. */
if (in_level == out_level)
return;
gpio_set_level(GPIO_PCH_SYS_PWROK, in_level);
CPRINTS("Pass through GPIO_ALL_SYS_PGOOD: %d", in_level);
}
enum power_state power_handle_state(enum power_state state)
{
enum power_state new_state;
/* Process ALL_SYS_PGOOD state changes. */
handle_all_sys_pgood(state);
if (state == POWER_S5 && !power_has_signals(IN_PGOOD_ALL_CORE)) {
/* Required rail went away */
internal_chipset_shutdown();
new_state = POWER_S5G3;
goto rsmrst_handle;
}
/* If force shutdown is requested, perform that. */
if (force_shutdown)
internal_chipset_shutdown();
new_state = common_intel_x86_power_handle_state(state);
rsmrst_handle:
/*
* Process RSMRST_L state changes:
* RSMRST_L de-assertion is passed to SoC only on G3S5 to S5 transition.
* RSMRST_L is also checked in some states and, if asserted, will
* force shutdown.
*/
common_intel_x86_handle_rsmrst(new_state);
return new_state;
}
/**
* chipset check if PLTRST# is valid.
*
* @return non-zero if PLTRST# is valid, 0 if invalid.
*/
int chipset_pltrst_is_valid(void)
{
/*
* Invalid PLTRST# from SOC unless RSMRST#
* from PMIC through EC to soc is deasserted.
*/
return (gpio_get_level(GPIO_RSMRST_L_PGOOD) &&
gpio_get_level(GPIO_PCH_RSMRST_L));
}
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