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 - 2018, 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 #if (!ACPI_REDUCED_HARDWARE)
  20 static acpi_status
  21 acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
  22                                    acpi_physical_address physical_address,
  23                                    acpi_physical_address physical_address64);
  24 #endif
  25
  26 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id);
  27
  28 /*
  29  * Dispatch table used to efficiently branch to the various sleep
  30  * functions.
  31  */
  32 #define ACPI_SLEEP_FUNCTION_ID         0
  33 #define ACPI_WAKE_PREP_FUNCTION_ID     1
  34 #define ACPI_WAKE_FUNCTION_ID          2
  35
  36 /* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */
  37
  38 static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
  39         {ACPI_STRUCT_INIT(legacy_function,
  40                           ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep)),
  41          ACPI_STRUCT_INIT(extended_function,
  42                           acpi_hw_extended_sleep)},
  43         {ACPI_STRUCT_INIT(legacy_function,
  44                           ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep)),
  45          ACPI_STRUCT_INIT(extended_function,
  46                           acpi_hw_extended_wake_prep)},
  47         {ACPI_STRUCT_INIT(legacy_function,
  48                           ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake)),
  49          ACPI_STRUCT_INIT(extended_function,
  50                           acpi_hw_extended_wake)}
  51 };
  52
  53 /*
  54  * These functions are removed for the ACPI_REDUCED_HARDWARE case:
  55  *      acpi_set_firmware_waking_vector
  56  *      acpi_enter_sleep_state_s4bios
  57  */
  58
  59 #if (!ACPI_REDUCED_HARDWARE)
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_hw_set_firmware_waking_vector
  63  *
  64  * PARAMETERS:  facs                - Pointer to FACS table
  65  *              physical_address    - 32-bit physical address of ACPI real mode
  66  *                                    entry point
  67  *              physical_address64  - 64-bit physical address of ACPI protected
  68  *                                    mode entry point
  69  *
  70  * RETURN:      Status
  71  *
  72  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
  73  *
  74  ******************************************************************************/
  75
  76 static acpi_status
  77 acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
  78                                    acpi_physical_address physical_address,
  79                                    acpi_physical_address physical_address64)
  80 {
  81         ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector);
  82
  83
  84         /*
  85          * According to the ACPI specification 2.0c and later, the 64-bit
  86          * waking vector should be cleared and the 32-bit waking vector should
  87          * be used, unless we want the wake-up code to be called by the BIOS in
  88          * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
  89          * to fail to resume if the 64-bit vector is used.
  90          */
  91
  92         /* Set the 32-bit vector */
  93
  94         facs->firmware_waking_vector = (u32)physical_address;
  95
  96         if (facs->length > 32) {
  97                 if (facs->version >= 1) {
  98
  99                         /* Set the 64-bit vector */
 100
 101                         facs->xfirmware_waking_vector = physical_address64;
 102                 } else {
 103                         /* Clear the 64-bit vector if it exists */
 104
 105                         facs->xfirmware_waking_vector = 0;
 106                 }
 107         }
 108
 109         return_ACPI_STATUS(AE_OK);
 110 }
 111
 112 /*******************************************************************************
 113  *
 114  * FUNCTION:    acpi_set_firmware_waking_vector
 115  *
 116  * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
 117  *                                    entry point
 118  *              physical_address64  - 64-bit physical address of ACPI protected
 119  *                                    mode entry point
 120  *
 121  * RETURN:      Status
 122  *
 123  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
 124  *
 125  ******************************************************************************/
 126
 127 acpi_status
 128 acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
 129                                 acpi_physical_address physical_address64)
 130 {
 131
 132         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
 133
 134         if (acpi_gbl_FACS) {
 135                 (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_FACS,
 136                                                          physical_address,
 137                                                          physical_address64);
 138         }
 139
 140         return_ACPI_STATUS(AE_OK);
 141 }
 142
 143 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
 144
 145 /*******************************************************************************
 146  *
 147  * FUNCTION:    acpi_enter_sleep_state_s4bios
 148  *
 149  * PARAMETERS:  None
 150  *
 151  * RETURN:      Status
 152  *
 153  * DESCRIPTION: Perform a S4 bios request.
 154  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 155  *
 156  ******************************************************************************/
 157 acpi_status acpi_enter_sleep_state_s4bios(void)
 158 {
 159         u32 in_value;
 160         acpi_status status;
 161
 162         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 163
 164         /* Clear the wake status bit (PM1) */
 165
 166         status =
 167             acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
 168         if (ACPI_FAILURE(status)) {
 169                 return_ACPI_STATUS(status);
 170         }
 171
 172         status = acpi_hw_clear_acpi_status();
 173         if (ACPI_FAILURE(status)) {
 174                 return_ACPI_STATUS(status);
 175         }
 176
 177         /*
 178          * 1) Disable all GPEs
 179          * 2) Enable all wakeup GPEs
 180          */
 181         status = acpi_hw_disable_all_gpes();
 182         if (ACPI_FAILURE(status)) {
 183                 return_ACPI_STATUS(status);
 184         }
 185         acpi_gbl_system_awake_and_running = FALSE;
 186
 187         status = acpi_hw_enable_all_wakeup_gpes();
 188         if (ACPI_FAILURE(status)) {
 189                 return_ACPI_STATUS(status);
 190         }
 191
 192         ACPI_FLUSH_CPU_CACHE();
 193
 194         status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
 195                                     (u32)acpi_gbl_FADT.s4_bios_request, 8);
 196
 197         do {
 198                 acpi_os_stall(ACPI_USEC_PER_MSEC);
 199                 status =
 200                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 201                 if (ACPI_FAILURE(status)) {
 202                         return_ACPI_STATUS(status);
 203                 }
 204
 205         } while (!in_value);
 206
 207         return_ACPI_STATUS(AE_OK);
 208 }
 209
 210 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 211 #endif                          /* !ACPI_REDUCED_HARDWARE */
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_hw_sleep_dispatch
 215  *
 216  * PARAMETERS:  sleep_state         - Which sleep state to enter/exit
 217  *              function_id         - Sleep, wake_prep, or Wake
 218  *
 219  * RETURN:      Status from the invoked sleep handling function.
 220  *
 221  * DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
 222  *              function.
 223  *
 224  ******************************************************************************/
 225 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
 226 {
 227         acpi_status status;
 228         struct acpi_sleep_functions *sleep_functions =
 229             &acpi_sleep_dispatch[function_id];
 230
 231 #if (!ACPI_REDUCED_HARDWARE)
 232         /*
 233          * If the Hardware Reduced flag is set (from the FADT), we must
 234          * use the extended sleep registers (FADT). Note: As per the ACPI
 235          * specification, these extended registers are to be used for HW-reduced
 236          * platforms only. They are not general-purpose replacements for the
 237          * legacy PM register sleep support.
 238          */
 239         if (acpi_gbl_reduced_hardware) {
 240                 status = sleep_functions->extended_function(sleep_state);
 241         } else {
 242                 /* Legacy sleep */
 243
 244                 status = sleep_functions->legacy_function(sleep_state);
 245         }
 246
 247         return (status);
 248
 249 #else
 250         /*
 251          * For the case where reduced-hardware-only code is being generated,
 252          * we know that only the extended sleep registers are available
 253          */
 254         status = sleep_functions->extended_function(sleep_state);
 255         return (status);
 256
 257 #endif                          /* !ACPI_REDUCED_HARDWARE */
 258 }
 259
 260 /*******************************************************************************
 261  *
 262  * FUNCTION:    acpi_enter_sleep_state_prep
 263  *
 264  * PARAMETERS:  sleep_state         - Which sleep state to enter
 265  *
 266  * RETURN:      Status
 267  *
 268  * DESCRIPTION: Prepare to enter a system sleep state.
 269  *              This function must execute with interrupts enabled.
 270  *              We break sleeping into 2 stages so that OSPM can handle
 271  *              various OS-specific tasks between the two steps.
 272  *
 273  ******************************************************************************/
 274
 275 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 276 {
 277         acpi_status status;
 278         struct acpi_object_list arg_list;
 279         union acpi_object arg;
 280         u32 sst_value;
 281
 282         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 283
 284         status = acpi_get_sleep_type_data(sleep_state,
 285                                           &acpi_gbl_sleep_type_a,
 286                                           &acpi_gbl_sleep_type_b);
 287         if (ACPI_FAILURE(status)) {
 288                 return_ACPI_STATUS(status);
 289         }
 290
 291         /* Execute the _PTS method (Prepare To Sleep) */
 292
 293         arg_list.count = 1;
 294         arg_list.pointer = &arg;
 295         arg.type = ACPI_TYPE_INTEGER;
 296         arg.integer.value = sleep_state;
 297
 298         status =
 299             acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
 300         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 301                 return_ACPI_STATUS(status);
 302         }
 303
 304         /* Setup the argument to the _SST method (System STatus) */
 305
 306         switch (sleep_state) {
 307         case ACPI_STATE_S0:
 308
 309                 sst_value = ACPI_SST_WORKING;
 310                 break;
 311
 312         case ACPI_STATE_S1:
 313         case ACPI_STATE_S2:
 314         case ACPI_STATE_S3:
 315
 316                 sst_value = ACPI_SST_SLEEPING;
 317                 break;
 318
 319         case ACPI_STATE_S4:
 320
 321                 sst_value = ACPI_SST_SLEEP_CONTEXT;
 322                 break;
 323
 324         default:
 325
 326                 sst_value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 327                 break;
 328         }
 329
 330         /*
 331          * Set the system indicators to show the desired sleep state.
 332          * _SST is an optional method (return no error if not found)
 333          */
 334         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
 335         return_ACPI_STATUS(AE_OK);
 336 }
 337
 338 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 339
 340 /*******************************************************************************
 341  *
 342  * FUNCTION:    acpi_enter_sleep_state
 343  *
 344  * PARAMETERS:  sleep_state         - Which sleep state to enter
 345  *
 346  * RETURN:      Status
 347  *
 348  * DESCRIPTION: Enter a system sleep state
 349  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 350  *
 351  ******************************************************************************/
 352 acpi_status acpi_enter_sleep_state(u8 sleep_state)
 353 {
 354         acpi_status status;
 355
 356         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 357
 358         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 359             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 360                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
 361                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 362                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 363         }
 364
 365         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
 366         return_ACPI_STATUS(status);
 367 }
 368
 369 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 370
 371 /*******************************************************************************
 372  *
 373  * FUNCTION:    acpi_leave_sleep_state_prep
 374  *
 375  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 376  *
 377  * RETURN:      Status
 378  *
 379  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 380  *              sleep. Called with interrupts DISABLED.
 381  *              We break wake/resume into 2 stages so that OSPM can handle
 382  *              various OS-specific tasks between the two steps.
 383  *
 384  ******************************************************************************/
 385 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 386 {
 387         acpi_status status;
 388
 389         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 390
 391         status =
 392             acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID);
 393         return_ACPI_STATUS(status);
 394 }
 395
 396 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
 397
 398 /*******************************************************************************
 399  *
 400  * FUNCTION:    acpi_leave_sleep_state
 401  *
 402  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 403  *
 404  * RETURN:      Status
 405  *
 406  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 407  *              Called with interrupts ENABLED.
 408  *
 409  ******************************************************************************/
 410 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 411 {
 412         acpi_status status;
 413
 414         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 415
 416         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
 417         return_ACPI_STATUS(status);
 418 }
 419
 420 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)