drivers/acpi/acpica/hwesleep.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Name: hwesleep.c - ACPI Hardware Sleep/Wake Support functions for the
   5  *                    extended FADT-V5 sleep registers.
   6  *
   7  * Copyright (C) 2000 - 2020, Intel Corp.
   8  *
   9  *****************************************************************************/
  10
  11 #include <acpi/acpi.h>
  12 #include "accommon.h"
  13
  14 #define _COMPONENT          ACPI_HARDWARE
  15 ACPI_MODULE_NAME("hwesleep")
  16
  17 /*******************************************************************************
  18  *
  19  * FUNCTION:    acpi_hw_execute_sleep_method
  20  *
  21  * PARAMETERS:  method_pathname     - Pathname of method to execute
  22  *              integer_argument    - Argument to pass to the method
  23  *
  24  * RETURN:      None
  25  *
  26  * DESCRIPTION: Execute a sleep/wake related method with one integer argument
  27  *              and no return value.
  28  *
  29  ******************************************************************************/
  30 void acpi_hw_execute_sleep_method(char *method_pathname, u32 integer_argument)
  31 {
  32         struct acpi_object_list arg_list;
  33         union acpi_object arg;
  34         acpi_status status;
  35
  36         ACPI_FUNCTION_TRACE(hw_execute_sleep_method);
  37
  38         /* One argument, integer_argument; No return value expected */
  39
  40         arg_list.count = 1;
  41         arg_list.pointer = &arg;
  42         arg.type = ACPI_TYPE_INTEGER;
  43         arg.integer.value = (u64)integer_argument;
  44
  45         status = acpi_evaluate_object(NULL, method_pathname, &arg_list, NULL);
  46         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  47                 ACPI_EXCEPTION((AE_INFO, status, "While executing method %s",
  48                                 method_pathname));
  49         }
  50
  51         return_VOID;
  52 }
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_hw_extended_sleep
  57  *
  58  * PARAMETERS:  sleep_state         - Which sleep state to enter
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Enter a system sleep state via the extended FADT sleep
  63  *              registers (V5 FADT).
  64  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status acpi_hw_extended_sleep(u8 sleep_state)
  69 {
  70         acpi_status status;
  71         u8 sleep_control;
  72         u64 sleep_status;
  73
  74         ACPI_FUNCTION_TRACE(hw_extended_sleep);
  75
  76         /* Extended sleep registers must be valid */
  77
  78         if (!acpi_gbl_FADT.sleep_control.address ||
  79             !acpi_gbl_FADT.sleep_status.address) {
  80                 return_ACPI_STATUS(AE_NOT_EXIST);
  81         }
  82
  83         /* Clear wake status (WAK_STS) */
  84
  85         status = acpi_write((u64)ACPI_X_WAKE_STATUS,
  86                             &acpi_gbl_FADT.sleep_status);
  87         if (ACPI_FAILURE(status)) {
  88                 return_ACPI_STATUS(status);
  89         }
  90
  91         acpi_gbl_system_awake_and_running = FALSE;
  92
  93         /*
  94          * Set the SLP_TYP and SLP_EN bits.
  95          *
  96          * Note: We only use the first value returned by the \_Sx method
  97          * (acpi_gbl_sleep_type_a) - As per ACPI specification.
  98          */
  99         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 100                           "Entering sleep state [S%u]\n", sleep_state));
 101
 102         sleep_control = ((acpi_gbl_sleep_type_a << ACPI_X_SLEEP_TYPE_POSITION) &
 103                          ACPI_X_SLEEP_TYPE_MASK) | ACPI_X_SLEEP_ENABLE;
 104
 105         /* Flush caches, as per ACPI specification */
 106
 107         ACPI_FLUSH_CPU_CACHE();
 108
 109         status = acpi_os_enter_sleep(sleep_state, sleep_control, 0);
 110         if (status == AE_CTRL_TERMINATE) {
 111                 return_ACPI_STATUS(AE_OK);
 112         }
 113         if (ACPI_FAILURE(status)) {
 114                 return_ACPI_STATUS(status);
 115         }
 116
 117         status = acpi_write((u64)sleep_control, &acpi_gbl_FADT.sleep_control);
 118         if (ACPI_FAILURE(status)) {
 119                 return_ACPI_STATUS(status);
 120         }
 121
 122         /* Wait for transition back to Working State */
 123
 124         do {
 125                 status = acpi_read(&sleep_status, &acpi_gbl_FADT.sleep_status);
 126                 if (ACPI_FAILURE(status)) {
 127                         return_ACPI_STATUS(status);
 128                 }
 129
 130         } while (!(((u8)sleep_status) & ACPI_X_WAKE_STATUS));
 131
 132         return_ACPI_STATUS(AE_OK);
 133 }
 134
 135 /*******************************************************************************
 136  *
 137  * FUNCTION:    acpi_hw_extended_wake_prep
 138  *
 139  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 140  *
 141  * RETURN:      Status
 142  *
 143  * DESCRIPTION: Perform first part of OS-independent ACPI cleanup after
 144  *              a sleep. Called with interrupts ENABLED.
 145  *
 146  ******************************************************************************/
 147
 148 acpi_status acpi_hw_extended_wake_prep(u8 sleep_state)
 149 {
 150         acpi_status status;
 151         u8 sleep_type_value;
 152
 153         ACPI_FUNCTION_TRACE(hw_extended_wake_prep);
 154
 155         status = acpi_get_sleep_type_data(ACPI_STATE_S0,
 156                                           &acpi_gbl_sleep_type_a,
 157                                           &acpi_gbl_sleep_type_b);
 158         if (ACPI_SUCCESS(status)) {
 159                 sleep_type_value =
 160                     ((acpi_gbl_sleep_type_a << ACPI_X_SLEEP_TYPE_POSITION) &
 161                      ACPI_X_SLEEP_TYPE_MASK);
 162
 163                 (void)acpi_write((u64)(sleep_type_value | ACPI_X_SLEEP_ENABLE),
 164                                  &acpi_gbl_FADT.sleep_control);
 165         }
 166
 167         return_ACPI_STATUS(AE_OK);
 168 }
 169
 170 /*******************************************************************************
 171  *
 172  * FUNCTION:    acpi_hw_extended_wake
 173  *
 174  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 175  *
 176  * RETURN:      Status
 177  *
 178  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 179  *              Called with interrupts ENABLED.
 180  *
 181  ******************************************************************************/
 182
 183 acpi_status acpi_hw_extended_wake(u8 sleep_state)
 184 {
 185         ACPI_FUNCTION_TRACE(hw_extended_wake);
 186
 187         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 188
 189         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 190
 191         /* Execute the wake methods */
 192
 193         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING);
 194         acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state);
 195
 196         /*
 197          * Some BIOS code assumes that WAK_STS will be cleared on resume
 198          * and use it to determine whether the system is rebooting or
 199          * resuming. Clear WAK_STS for compatibility.
 200          */
 201         (void)acpi_write((u64)ACPI_X_WAKE_STATUS, &acpi_gbl_FADT.sleep_status);
 202         acpi_gbl_system_awake_and_running = TRUE;
 203
 204         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
 205         return_ACPI_STATUS(AE_OK);
 206 }