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![Erik Schmauss](/assets/img/avatar_default.png)
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
206 lines
5.8 KiB
C
206 lines
5.8 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Name: hwesleep.c - ACPI Hardware Sleep/Wake Support functions for the
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* extended FADT-V5 sleep registers.
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#define _COMPONENT ACPI_HARDWARE
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ACPI_MODULE_NAME("hwesleep")
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_execute_sleep_method
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*
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* PARAMETERS: method_pathname - Pathname of method to execute
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* integer_argument - Argument to pass to the method
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*
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* RETURN: None
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*
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* DESCRIPTION: Execute a sleep/wake related method with one integer argument
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* and no return value.
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*
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******************************************************************************/
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void acpi_hw_execute_sleep_method(char *method_pathname, u32 integer_argument)
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{
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struct acpi_object_list arg_list;
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union acpi_object arg;
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acpi_status status;
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ACPI_FUNCTION_TRACE(hw_execute_sleep_method);
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/* One argument, integer_argument; No return value expected */
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = (u64)integer_argument;
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status = acpi_evaluate_object(NULL, method_pathname, &arg_list, NULL);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
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ACPI_EXCEPTION((AE_INFO, status, "While executing method %s",
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method_pathname));
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_extended_sleep
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*
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* PARAMETERS: sleep_state - Which sleep state to enter
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*
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* RETURN: Status
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*
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* DESCRIPTION: Enter a system sleep state via the extended FADT sleep
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* registers (V5 FADT).
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* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
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*
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******************************************************************************/
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acpi_status acpi_hw_extended_sleep(u8 sleep_state)
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{
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acpi_status status;
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u8 sleep_control;
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u64 sleep_status;
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ACPI_FUNCTION_TRACE(hw_extended_sleep);
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/* Extended sleep registers must be valid */
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if (!acpi_gbl_FADT.sleep_control.address ||
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!acpi_gbl_FADT.sleep_status.address) {
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return_ACPI_STATUS(AE_NOT_EXIST);
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}
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/* Clear wake status (WAK_STS) */
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status = acpi_write((u64)ACPI_X_WAKE_STATUS,
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&acpi_gbl_FADT.sleep_status);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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acpi_gbl_system_awake_and_running = FALSE;
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/*
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* Set the SLP_TYP and SLP_EN bits.
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*
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* Note: We only use the first value returned by the \_Sx method
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* (acpi_gbl_sleep_type_a) - As per ACPI specification.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_INIT,
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"Entering sleep state [S%u]\n", sleep_state));
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sleep_control = ((acpi_gbl_sleep_type_a << ACPI_X_SLEEP_TYPE_POSITION) &
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ACPI_X_SLEEP_TYPE_MASK) | ACPI_X_SLEEP_ENABLE;
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/* Flush caches, as per ACPI specification */
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ACPI_FLUSH_CPU_CACHE();
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status = acpi_os_enter_sleep(sleep_state, sleep_control, 0);
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if (status == AE_CTRL_TERMINATE) {
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return_ACPI_STATUS(AE_OK);
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}
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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status = acpi_write((u64)sleep_control, &acpi_gbl_FADT.sleep_control);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Wait for transition back to Working State */
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do {
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status = acpi_read(&sleep_status, &acpi_gbl_FADT.sleep_status);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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} while (!(((u8)sleep_status) & ACPI_X_WAKE_STATUS));
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_extended_wake_prep
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*
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* PARAMETERS: sleep_state - Which sleep state we just exited
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*
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* RETURN: Status
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*
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* DESCRIPTION: Perform first part of OS-independent ACPI cleanup after
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* a sleep. Called with interrupts ENABLED.
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*
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******************************************************************************/
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acpi_status acpi_hw_extended_wake_prep(u8 sleep_state)
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{
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acpi_status status;
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u8 sleep_type_value;
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ACPI_FUNCTION_TRACE(hw_extended_wake_prep);
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status = acpi_get_sleep_type_data(ACPI_STATE_S0,
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&acpi_gbl_sleep_type_a,
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&acpi_gbl_sleep_type_b);
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if (ACPI_SUCCESS(status)) {
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sleep_type_value =
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((acpi_gbl_sleep_type_a << ACPI_X_SLEEP_TYPE_POSITION) &
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ACPI_X_SLEEP_TYPE_MASK);
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(void)acpi_write((u64)(sleep_type_value | ACPI_X_SLEEP_ENABLE),
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&acpi_gbl_FADT.sleep_control);
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_extended_wake
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*
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* PARAMETERS: sleep_state - Which sleep state we just exited
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*
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* RETURN: Status
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*
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* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
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* Called with interrupts ENABLED.
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*
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******************************************************************************/
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acpi_status acpi_hw_extended_wake(u8 sleep_state)
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{
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ACPI_FUNCTION_TRACE(hw_extended_wake);
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/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
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acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
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/* Execute the wake methods */
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acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING);
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acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state);
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/*
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* Some BIOS code assumes that WAK_STS will be cleared on resume
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* and use it to determine whether the system is rebooting or
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* resuming. Clear WAK_STS for compatibility.
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*/
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(void)acpi_write((u64)ACPI_X_WAKE_STATUS, &acpi_gbl_FADT.sleep_status);
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acpi_gbl_system_awake_and_running = TRUE;
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acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
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return_ACPI_STATUS(AE_OK);
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}
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