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206 lines
5.8 KiB
206 lines
5.8 KiB
// 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 - 2021, 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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