// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Name: hwxfsleep.c - ACPI Hardware Sleep/Wake External Interfaces
*
* Copyright (C) 2000 - 2025, Intel Corp.
*
*****************************************************************************/
#define EXPORT_ACPI_INTERFACES
#include <acpi/acpi.h>
#include "accommon.h"
#define _COMPONENT ACPI_HARDWARE
ACPI_MODULE_NAME(
"hwxfsleep")
/* Local prototypes */
static acpi_status
acpi_hw_set_firmware_waking_vector(
struct acpi_table_facs *facs,
acpi_physical_address physical_address,
acpi_physical_address physical_address64);
/*******************************************************************************
*
* FUNCTION: acpi_hw_set_firmware_waking_vector
*
* PARAMETERS: facs - Pointer to FACS table
* physical_address - 32-bit physical address of ACPI real mode
* entry point
* physical_address64 - 64-bit physical address of ACPI protected
* mode entry point
*
* RETURN: Status
*
* DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
*
******************************************************************************/
static acpi_status
acpi_hw_set_firmware_waking_vector(
struct acpi_table_facs *facs,
acpi_physical_address physical_address,
acpi_physical_address physical_address64)
{
ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector);
/*
* According to the ACPI specification 2.0c and later, the 64-bit
* waking vector should be cleared and the 32-bit waking vector should
* be used, unless we want the wake-up code to be called by the BIOS in
* Protected Mode. Some systems (for example HP dv5-1004nr) are known
* to fail to resume if the 64-bit vector is used.
*/
/* Set the 32-bit vector */
facs->firmware_waking_vector = (u32)physical_address;
if (facs->length > 32) {
if (facs->version >= 1) {
/* Set the 64-bit vector */
facs->xfirmware_waking_vector = physical_address64;
}
else {
/* Clear the 64-bit vector if it exists */
facs->xfirmware_waking_vector = 0;
}
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_set_firmware_waking_vector
*
* PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
* entry point
* physical_address64 - 64-bit physical address of ACPI protected
* mode entry point
*
* RETURN: Status
*
* DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
*
******************************************************************************/
acpi_status
acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
acpi_physical_address physical_address64)
{
ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
if (acpi_gbl_FACS) {
(
void)acpi_hw_set_firmware_waking_vector(acpi_gbl_FACS,
physical_address,
physical_address64);
}
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
/*
* These functions are removed for the ACPI_REDUCED_HARDWARE case:
* acpi_enter_sleep_state_s4bios
*/
#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
*
* FUNCTION: acpi_enter_sleep_state_s4bios
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Perform a S4 bios request.
* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
*
******************************************************************************/
acpi_status acpi_enter_sleep_state_s4bios(
void)
{
u32 in_value;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
/* Clear the wake status bit (PM1) */
status =
acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_hw_clear_acpi_status();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* 1) Disable all GPEs
* 2) Enable all wakeup GPEs
*/
status = acpi_hw_disable_all_gpes();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
acpi_gbl_system_awake_and_running =
FALSE;
status = acpi_hw_enable_all_wakeup_gpes();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
(u32)acpi_gbl_FADT.s4_bios_request, 8);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
do {
acpi_os_stall(ACPI_USEC_PER_MSEC);
status =
acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
while (!in_value);
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
#endif /* !ACPI_REDUCED_HARDWARE */
/*******************************************************************************
*
* FUNCTION: acpi_enter_sleep_state_prep
*
* PARAMETERS: sleep_state - Which sleep state to enter
*
* RETURN: Status
*
* DESCRIPTION: Prepare to enter a system sleep state.
* This function must execute with interrupts enabled.
* We break sleeping into 2 stages so that OSPM can handle
* various OS-specific tasks between the two steps.
*
******************************************************************************/
acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
{
acpi_status status;
struct acpi_object_list arg_list;
union acpi_object arg;
u32 sst_value;
ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
status = acpi_get_sleep_type_data(sleep_state,
&acpi_gbl_sleep_type_a,
&acpi_gbl_sleep_type_b);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_get_sleep_type_data(ACPI_STATE_S0,
&acpi_gbl_sleep_type_a_s0,
&acpi_gbl_sleep_type_b_s0);
if (ACPI_FAILURE(status)) {
acpi_gbl_sleep_type_a_s0 = ACPI_SLEEP_TYPE_INVALID;
}
/* Execute the _PTS method (Prepare To Sleep) */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = sleep_state;
status =
acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
return_ACPI_STATUS(status);
}
/* Setup the argument to the _SST method (System STatus) */
switch (sleep_state) {
case ACPI_STATE_S0:
sst_value = ACPI_SST_WORKING;
break;
case ACPI_STATE_S1:
case ACPI_STATE_S2:
case ACPI_STATE_S3:
sst_value = ACPI_SST_SLEEPING;
break;
case ACPI_STATE_S4:
sst_value = ACPI_SST_SLEEP_CONTEXT;
break;
default:
sst_value = ACPI_SST_INDICATOR_OFF;
/* Default is off */
break;
}
/*
* Set the system indicators to show the desired sleep state.
* _SST is an optional method (return no error if not found)
*/
acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
/*******************************************************************************
*
* FUNCTION: acpi_enter_sleep_state
*
* PARAMETERS: sleep_state - Which sleep state to enter
*
* RETURN: Status
*
* DESCRIPTION: Enter a system sleep state
* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
*
******************************************************************************/
acpi_status acpi_enter_sleep_state(u8 sleep_state)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
(acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
ACPI_ERROR((AE_INFO,
"Sleep values out of range: A=0x%X B=0x%X",
acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
}
#if !ACPI_REDUCED_HARDWARE
if (!acpi_gbl_reduced_hardware)
status = acpi_hw_legacy_sleep(sleep_state);
else
#endif
status = acpi_hw_extended_sleep(sleep_state);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
/*******************************************************************************
*
* FUNCTION: acpi_leave_sleep_state_prep
*
* PARAMETERS: sleep_state - Which sleep state we are exiting
*
* RETURN: Status
*
* DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
* sleep. Called with interrupts DISABLED.
* We break wake/resume into 2 stages so that OSPM can handle
* various OS-specific tasks between the two steps.
*
******************************************************************************/
acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
#if !ACPI_REDUCED_HARDWARE
if (!acpi_gbl_reduced_hardware)
status = acpi_hw_legacy_wake_prep(sleep_state);
else
#endif
status = acpi_hw_extended_wake_prep(sleep_state);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
/*******************************************************************************
*
* FUNCTION: acpi_leave_sleep_state
*
* PARAMETERS: sleep_state - Which sleep state we are exiting
*
* RETURN: Status
*
* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
* Called with interrupts ENABLED.
*
******************************************************************************/
acpi_status acpi_leave_sleep_state(u8 sleep_state)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
#if !ACPI_REDUCED_HARDWARE
if (!acpi_gbl_reduced_hardware)
status = acpi_hw_legacy_wake(sleep_state);
else
#endif
status = acpi_hw_extended_wake(sleep_state);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)
