drivers/acpi/acpica/hwxfsleep.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Name: hwxfsleep.c - ACPI Hardware Sleep/Wake External Interfaces
   5  *
   6  * Copyright (C) 2000 - 2023, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #define EXPORT_ACPI_INTERFACES
  11
  12 #include <acpi/acpi.h>
  13 #include "accommon.h"
  14
  15 #define _COMPONENT          ACPI_HARDWARE
  16 ACPI_MODULE_NAME("hwxfsleep")
  17
  18 /* Local prototypes */
  19 static acpi_status
  20 acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
  21                                    acpi_physical_address physical_address,
  22                                    acpi_physical_address physical_address64);
  23
  24 /*******************************************************************************
  25  *
  26  * FUNCTION:    acpi_hw_set_firmware_waking_vector
  27  *
  28  * PARAMETERS:  facs                - Pointer to FACS table
  29  *              physical_address    - 32-bit physical address of ACPI real mode
  30  *                                    entry point
  31  *              physical_address64  - 64-bit physical address of ACPI protected
  32  *                                    mode entry point
  33  *
  34  * RETURN:      Status
  35  *
  36  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
  37  *
  38  ******************************************************************************/
  39
  40 static acpi_status
  41 acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
  42                                    acpi_physical_address physical_address,
  43                                    acpi_physical_address physical_address64)
  44 {
  45         ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector);
  46
  47
  48         /*
  49          * According to the ACPI specification 2.0c and later, the 64-bit
  50          * waking vector should be cleared and the 32-bit waking vector should
  51          * be used, unless we want the wake-up code to be called by the BIOS in
  52          * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
  53          * to fail to resume if the 64-bit vector is used.
  54          */
  55
  56         /* Set the 32-bit vector */
  57
  58         facs->firmware_waking_vector = (u32)physical_address;
  59
  60         if (facs->length > 32) {
  61                 if (facs->version >= 1) {
  62
  63                         /* Set the 64-bit vector */
  64
  65                         facs->xfirmware_waking_vector = physical_address64;
  66                 } else {
  67                         /* Clear the 64-bit vector if it exists */
  68
  69                         facs->xfirmware_waking_vector = 0;
  70                 }
  71         }
  72
  73         return_ACPI_STATUS(AE_OK);
  74 }
  75
  76 /*******************************************************************************
  77  *
  78  * FUNCTION:    acpi_set_firmware_waking_vector
  79  *
  80  * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
  81  *                                    entry point
  82  *              physical_address64  - 64-bit physical address of ACPI protected
  83  *                                    mode entry point
  84  *
  85  * RETURN:      Status
  86  *
  87  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
  88  *
  89  ******************************************************************************/
  90
  91 acpi_status
  92 acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
  93                                 acpi_physical_address physical_address64)
  94 {
  95
  96         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
  97
  98         if (acpi_gbl_FACS) {
  99                 (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_FACS,
 100                                                          physical_address,
 101                                                          physical_address64);
 102         }
 103
 104         return_ACPI_STATUS(AE_OK);
 105 }
 106
 107 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
 108
 109 /*
 110  * These functions are removed for the ACPI_REDUCED_HARDWARE case:
 111  *      acpi_enter_sleep_state_s4bios
 112  */
 113
 114 #if (!ACPI_REDUCED_HARDWARE)
 115 /*******************************************************************************
 116  *
 117  * FUNCTION:    acpi_enter_sleep_state_s4bios
 118  *
 119  * PARAMETERS:  None
 120  *
 121  * RETURN:      Status
 122  *
 123  * DESCRIPTION: Perform a S4 bios request.
 124  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 125  *
 126  ******************************************************************************/
 127 acpi_status acpi_enter_sleep_state_s4bios(void)
 128 {
 129         u32 in_value;
 130         acpi_status status;
 131
 132         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 133
 134         /* Clear the wake status bit (PM1) */
 135
 136         status =
 137             acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
 138         if (ACPI_FAILURE(status)) {
 139                 return_ACPI_STATUS(status);
 140         }
 141
 142         status = acpi_hw_clear_acpi_status();
 143         if (ACPI_FAILURE(status)) {
 144                 return_ACPI_STATUS(status);
 145         }
 146
 147         /*
 148          * 1) Disable all GPEs
 149          * 2) Enable all wakeup GPEs
 150          */
 151         status = acpi_hw_disable_all_gpes();
 152         if (ACPI_FAILURE(status)) {
 153                 return_ACPI_STATUS(status);
 154         }
 155         acpi_gbl_system_awake_and_running = FALSE;
 156
 157         status = acpi_hw_enable_all_wakeup_gpes();
 158         if (ACPI_FAILURE(status)) {
 159                 return_ACPI_STATUS(status);
 160         }
 161
 162         status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
 163                                     (u32)acpi_gbl_FADT.s4_bios_request, 8);
 164         if (ACPI_FAILURE(status)) {
 165                 return_ACPI_STATUS(status);
 166         }
 167
 168         do {
 169                 acpi_os_stall(ACPI_USEC_PER_MSEC);
 170                 status =
 171                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 172                 if (ACPI_FAILURE(status)) {
 173                         return_ACPI_STATUS(status);
 174                 }
 175
 176         } while (!in_value);
 177
 178         return_ACPI_STATUS(AE_OK);
 179 }
 180
 181 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 182 #endif                          /* !ACPI_REDUCED_HARDWARE */
 183
 184 /*******************************************************************************
 185  *
 186  * FUNCTION:    acpi_enter_sleep_state_prep
 187  *
 188  * PARAMETERS:  sleep_state         - Which sleep state to enter
 189  *
 190  * RETURN:      Status
 191  *
 192  * DESCRIPTION: Prepare to enter a system sleep state.
 193  *              This function must execute with interrupts enabled.
 194  *              We break sleeping into 2 stages so that OSPM can handle
 195  *              various OS-specific tasks between the two steps.
 196  *
 197  ******************************************************************************/
 198
 199 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 200 {
 201         acpi_status status;
 202         struct acpi_object_list arg_list;
 203         union acpi_object arg;
 204         u32 sst_value;
 205
 206         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 207
 208         status = acpi_get_sleep_type_data(sleep_state,
 209                                           &acpi_gbl_sleep_type_a,
 210                                           &acpi_gbl_sleep_type_b);
 211         if (ACPI_FAILURE(status)) {
 212                 return_ACPI_STATUS(status);
 213         }
 214
 215         status = acpi_get_sleep_type_data(ACPI_STATE_S0,
 216                                           &acpi_gbl_sleep_type_a_s0,
 217                                           &acpi_gbl_sleep_type_b_s0);
 218         if (ACPI_FAILURE(status)) {
 219                 acpi_gbl_sleep_type_a_s0 = ACPI_SLEEP_TYPE_INVALID;
 220         }
 221
 222         /* Execute the _PTS method (Prepare To Sleep) */
 223
 224         arg_list.count = 1;
 225         arg_list.pointer = &arg;
 226         arg.type = ACPI_TYPE_INTEGER;
 227         arg.integer.value = sleep_state;
 228
 229         status =
 230             acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
 231         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 232                 return_ACPI_STATUS(status);
 233         }
 234
 235         /* Setup the argument to the _SST method (System STatus) */
 236
 237         switch (sleep_state) {
 238         case ACPI_STATE_S0:
 239
 240                 sst_value = ACPI_SST_WORKING;
 241                 break;
 242
 243         case ACPI_STATE_S1:
 244         case ACPI_STATE_S2:
 245         case ACPI_STATE_S3:
 246
 247                 sst_value = ACPI_SST_SLEEPING;
 248                 break;
 249
 250         case ACPI_STATE_S4:
 251
 252                 sst_value = ACPI_SST_SLEEP_CONTEXT;
 253                 break;
 254
 255         default:
 256
 257                 sst_value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 258                 break;
 259         }
 260
 261         /*
 262          * Set the system indicators to show the desired sleep state.
 263          * _SST is an optional method (return no error if not found)
 264          */
 265         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
 266         return_ACPI_STATUS(AE_OK);
 267 }
 268
 269 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 270
 271 /*******************************************************************************
 272  *
 273  * FUNCTION:    acpi_enter_sleep_state
 274  *
 275  * PARAMETERS:  sleep_state         - Which sleep state to enter
 276  *
 277  * RETURN:      Status
 278  *
 279  * DESCRIPTION: Enter a system sleep state
 280  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 281  *
 282  ******************************************************************************/
 283 acpi_status acpi_enter_sleep_state(u8 sleep_state)
 284 {
 285         acpi_status status;
 286
 287         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 288
 289         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 290             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 291                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
 292                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 293                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 294         }
 295
 296 #if !ACPI_REDUCED_HARDWARE
 297         if (!acpi_gbl_reduced_hardware)
 298                 status = acpi_hw_legacy_sleep(sleep_state);
 299         else
 300 #endif
 301                 status = acpi_hw_extended_sleep(sleep_state);
 302         return_ACPI_STATUS(status);
 303 }
 304
 305 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 306
 307 /*******************************************************************************
 308  *
 309  * FUNCTION:    acpi_leave_sleep_state_prep
 310  *
 311  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 312  *
 313  * RETURN:      Status
 314  *
 315  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 316  *              sleep. Called with interrupts DISABLED.
 317  *              We break wake/resume into 2 stages so that OSPM can handle
 318  *              various OS-specific tasks between the two steps.
 319  *
 320  ******************************************************************************/
 321 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 322 {
 323         acpi_status status;
 324
 325         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 326
 327 #if !ACPI_REDUCED_HARDWARE
 328         if (!acpi_gbl_reduced_hardware)
 329                 status = acpi_hw_legacy_wake_prep(sleep_state);
 330         else
 331 #endif
 332                 status = acpi_hw_extended_wake_prep(sleep_state);
 333         return_ACPI_STATUS(status);
 334 }
 335
 336 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
 337
 338 /*******************************************************************************
 339  *
 340  * FUNCTION:    acpi_leave_sleep_state
 341  *
 342  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 343  *
 344  * RETURN:      Status
 345  *
 346  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 347  *              Called with interrupts ENABLED.
 348  *
 349  ******************************************************************************/
 350 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 351 {
 352         acpi_status status;
 353
 354         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 355
 356 #if !ACPI_REDUCED_HARDWARE
 357         if (!acpi_gbl_reduced_hardware)
 358                 status = acpi_hw_legacy_wake(sleep_state);
 359         else
 360 #endif
 361                 status = acpi_hw_extended_wake(sleep_state);
 362         return_ACPI_STATUS(status);
 363 }
 364
 365 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)