kernel/drivers/acpi/acpica/hwxfsleep.c

   1 /******************************************************************************
   2  *
   3  * Name: hwxfsleep.c - ACPI Hardware Sleep/Wake External Interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #define EXPORT_ACPI_INTERFACES
  45
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48
  49 #define _COMPONENT          ACPI_HARDWARE
  50 ACPI_MODULE_NAME("hwxfsleep")
  51
  52 /* Local prototypes */
  53 #if (!ACPI_REDUCED_HARDWARE)
  54 static acpi_status
  55 acpi_hw_set_firmware_waking_vectors(struct acpi_table_facs *facs,
  56                                     acpi_physical_address physical_address,
  57                                     acpi_physical_address physical_address64);
  58 #endif
  59
  60 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id);
  61
  62 /*
  63  * Dispatch table used to efficiently branch to the various sleep
  64  * functions.
  65  */
  66 #define ACPI_SLEEP_FUNCTION_ID         0
  67 #define ACPI_WAKE_PREP_FUNCTION_ID     1
  68 #define ACPI_WAKE_FUNCTION_ID          2
  69
  70 /* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */
  71
  72 static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
  73         {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep),
  74          acpi_hw_extended_sleep},
  75         {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep),
  76          acpi_hw_extended_wake_prep},
  77         {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake), acpi_hw_extended_wake}
  78 };
  79
  80 /*
  81  * These functions are removed for the ACPI_REDUCED_HARDWARE case:
  82  *      acpi_set_firmware_waking_vectors
  83  *      acpi_set_firmware_waking_vector
  84  *      acpi_set_firmware_waking_vector64
  85  *      acpi_enter_sleep_state_s4bios
  86  */
  87
  88 #if (!ACPI_REDUCED_HARDWARE)
  89 /*******************************************************************************
  90  *
  91  * FUNCTION:    acpi_hw_set_firmware_waking_vectors
  92  *
  93  * PARAMETERS:  facs                - Pointer to FACS table
  94  *              physical_address    - 32-bit physical address of ACPI real mode
  95  *                                    entry point.
  96  *              physical_address64  - 64-bit physical address of ACPI protected
  97  *                                    mode entry point.
  98  *
  99  * RETURN:      Status
 100  *
 101  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
 102  *
 103  ******************************************************************************/
 104
 105 static acpi_status
 106 acpi_hw_set_firmware_waking_vectors(struct acpi_table_facs *facs,
 107                                     acpi_physical_address physical_address,
 108                                     acpi_physical_address physical_address64)
 109 {
 110         ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vectors);
 111
 112
 113         /*
 114          * According to the ACPI specification 2.0c and later, the 64-bit
 115          * waking vector should be cleared and the 32-bit waking vector should
 116          * be used, unless we want the wake-up code to be called by the BIOS in
 117          * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
 118          * to fail to resume if the 64-bit vector is used.
 119          */
 120
 121         /* Set the 32-bit vector */
 122
 123         facs->firmware_waking_vector = (u32)physical_address;
 124
 125         if (facs->length > 32) {
 126                 if (facs->version >= 1) {
 127
 128                         /* Set the 64-bit vector */
 129
 130                         facs->xfirmware_waking_vector = physical_address64;
 131                 } else {
 132                         /* Clear the 64-bit vector if it exists */
 133
 134                         facs->xfirmware_waking_vector = 0;
 135                 }
 136         }
 137
 138         return_ACPI_STATUS(AE_OK);
 139 }
 140
 141 /*******************************************************************************
 142  *
 143  * FUNCTION:    acpi_set_firmware_waking_vectors
 144  *
 145  * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
 146  *                                    entry point.
 147  *              physical_address64  - 64-bit physical address of ACPI protected
 148  *                                    mode entry point.
 149  *
 150  * RETURN:      Status
 151  *
 152  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
 153  *
 154  ******************************************************************************/
 155
 156 acpi_status
 157 acpi_set_firmware_waking_vectors(acpi_physical_address physical_address,
 158                                  acpi_physical_address physical_address64)
 159 {
 160
 161         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vectors);
 162
 163         if (acpi_gbl_FACS) {
 164                 (void)acpi_hw_set_firmware_waking_vectors(acpi_gbl_FACS,
 165                                                           physical_address,
 166                                                           physical_address64);
 167         }
 168
 169         return_ACPI_STATUS(AE_OK);
 170 }
 171
 172 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vectors)
 173
 174 /*******************************************************************************
 175  *
 176  * FUNCTION:    acpi_set_firmware_waking_vector
 177  *
 178  * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
 179  *                                    entry point.
 180  *
 181  * RETURN:      Status
 182  *
 183  * DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS
 184  *
 185  ******************************************************************************/
 186 acpi_status acpi_set_firmware_waking_vector(u32 physical_address)
 187 {
 188         acpi_status status;
 189
 190         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
 191
 192         status = acpi_set_firmware_waking_vectors((acpi_physical_address)
 193                                                   physical_address, 0);
 194
 195         return_ACPI_STATUS(status);
 196 }
 197
 198 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
 199
 200 #if ACPI_MACHINE_WIDTH == 64
 201 /*******************************************************************************
 202  *
 203  * FUNCTION:    acpi_set_firmware_waking_vector64
 204  *
 205  * PARAMETERS:  physical_address    - 64-bit physical address of ACPI protected
 206  *                                    mode entry point.
 207  *
 208  * RETURN:      Status
 209  *
 210  * DESCRIPTION: Sets the 64-bit X_firmware_waking_vector field of the FACS, if
 211  *              it exists in the table. This function is intended for use with
 212  *              64-bit host operating systems.
 213  *
 214  ******************************************************************************/
 215 acpi_status acpi_set_firmware_waking_vector64(u64 physical_address)
 216 {
 217         acpi_status status;
 218
 219         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector64);
 220
 221         status = acpi_set_firmware_waking_vectors(0,
 222                                                   (acpi_physical_address)
 223                                                   physical_address);
 224
 225         return_ACPI_STATUS(status);
 226 }
 227
 228 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64)
 229 #endif
 230 /*******************************************************************************
 231  *
 232  * FUNCTION:    acpi_enter_sleep_state_s4bios
 233  *
 234  * PARAMETERS:  None
 235  *
 236  * RETURN:      Status
 237  *
 238  * DESCRIPTION: Perform a S4 bios request.
 239  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 240  *
 241  ******************************************************************************/
 242 acpi_status acpi_enter_sleep_state_s4bios(void)
 243 {
 244         u32 in_value;
 245         acpi_status status;
 246
 247         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 248
 249         /* Clear the wake status bit (PM1) */
 250
 251         status =
 252             acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
 253         if (ACPI_FAILURE(status)) {
 254                 return_ACPI_STATUS(status);
 255         }
 256
 257         status = acpi_hw_clear_acpi_status();
 258         if (ACPI_FAILURE(status)) {
 259                 return_ACPI_STATUS(status);
 260         }
 261
 262         /*
 263          * 1) Disable/Clear all GPEs
 264          * 2) Enable all wakeup GPEs
 265          */
 266         status = acpi_hw_disable_all_gpes();
 267         if (ACPI_FAILURE(status)) {
 268                 return_ACPI_STATUS(status);
 269         }
 270         acpi_gbl_system_awake_and_running = FALSE;
 271
 272         status = acpi_hw_enable_all_wakeup_gpes();
 273         if (ACPI_FAILURE(status)) {
 274                 return_ACPI_STATUS(status);
 275         }
 276
 277         ACPI_FLUSH_CPU_CACHE();
 278
 279         status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
 280                                     (u32)acpi_gbl_FADT.s4_bios_request, 8);
 281
 282         do {
 283                 acpi_os_stall(ACPI_USEC_PER_MSEC);
 284                 status =
 285                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 286                 if (ACPI_FAILURE(status)) {
 287                         return_ACPI_STATUS(status);
 288                 }
 289         } while (!in_value);
 290
 291         return_ACPI_STATUS(AE_OK);
 292 }
 293
 294 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 295 #endif                          /* !ACPI_REDUCED_HARDWARE */
 296 /*******************************************************************************
 297  *
 298  * FUNCTION:    acpi_hw_sleep_dispatch
 299  *
 300  * PARAMETERS:  sleep_state         - Which sleep state to enter/exit
 301  *              function_id         - Sleep, wake_prep, or Wake
 302  *
 303  * RETURN:      Status from the invoked sleep handling function.
 304  *
 305  * DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
 306  *              function.
 307  *
 308  ******************************************************************************/
 309 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
 310 {
 311         acpi_status status;
 312         struct acpi_sleep_functions *sleep_functions =
 313             &acpi_sleep_dispatch[function_id];
 314
 315 #if (!ACPI_REDUCED_HARDWARE)
 316         /*
 317          * If the Hardware Reduced flag is set (from the FADT), we must
 318          * use the extended sleep registers (FADT). Note: As per the ACPI
 319          * specification, these extended registers are to be used for HW-reduced
 320          * platforms only. They are not general-purpose replacements for the
 321          * legacy PM register sleep support.
 322          */
 323         if (acpi_gbl_reduced_hardware) {
 324                 status = sleep_functions->extended_function(sleep_state);
 325         } else {
 326                 /* Legacy sleep */
 327
 328                 status = sleep_functions->legacy_function(sleep_state);
 329         }
 330
 331         return (status);
 332
 333 #else
 334         /*
 335          * For the case where reduced-hardware-only code is being generated,
 336          * we know that only the extended sleep registers are available
 337          */
 338         status = sleep_functions->extended_function(sleep_state);
 339         return (status);
 340
 341 #endif                          /* !ACPI_REDUCED_HARDWARE */
 342 }
 343
 344 /*******************************************************************************
 345  *
 346  * FUNCTION:    acpi_enter_sleep_state_prep
 347  *
 348  * PARAMETERS:  sleep_state         - Which sleep state to enter
 349  *
 350  * RETURN:      Status
 351  *
 352  * DESCRIPTION: Prepare to enter a system sleep state.
 353  *              This function must execute with interrupts enabled.
 354  *              We break sleeping into 2 stages so that OSPM can handle
 355  *              various OS-specific tasks between the two steps.
 356  *
 357  ******************************************************************************/
 358
 359 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 360 {
 361         acpi_status status;
 362         struct acpi_object_list arg_list;
 363         union acpi_object arg;
 364         u32 sst_value;
 365
 366         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 367
 368         status = acpi_get_sleep_type_data(sleep_state,
 369                                           &acpi_gbl_sleep_type_a,
 370                                           &acpi_gbl_sleep_type_b);
 371         if (ACPI_FAILURE(status)) {
 372                 return_ACPI_STATUS(status);
 373         }
 374
 375         /* Execute the _PTS method (Prepare To Sleep) */
 376
 377         arg_list.count = 1;
 378         arg_list.pointer = &arg;
 379         arg.type = ACPI_TYPE_INTEGER;
 380         arg.integer.value = sleep_state;
 381
 382         status =
 383             acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
 384         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 385                 return_ACPI_STATUS(status);
 386         }
 387
 388         /* Setup the argument to the _SST method (System STatus) */
 389
 390         switch (sleep_state) {
 391         case ACPI_STATE_S0:
 392
 393                 sst_value = ACPI_SST_WORKING;
 394                 break;
 395
 396         case ACPI_STATE_S1:
 397         case ACPI_STATE_S2:
 398         case ACPI_STATE_S3:
 399
 400                 sst_value = ACPI_SST_SLEEPING;
 401                 break;
 402
 403         case ACPI_STATE_S4:
 404
 405                 sst_value = ACPI_SST_SLEEP_CONTEXT;
 406                 break;
 407
 408         default:
 409
 410                 sst_value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 411                 break;
 412         }
 413
 414         /*
 415          * Set the system indicators to show the desired sleep state.
 416          * _SST is an optional method (return no error if not found)
 417          */
 418         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
 419         return_ACPI_STATUS(AE_OK);
 420 }
 421
 422 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 423
 424 /*******************************************************************************
 425  *
 426  * FUNCTION:    acpi_enter_sleep_state
 427  *
 428  * PARAMETERS:  sleep_state         - Which sleep state to enter
 429  *
 430  * RETURN:      Status
 431  *
 432  * DESCRIPTION: Enter a system sleep state
 433  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 434  *
 435  ******************************************************************************/
 436 acpi_status acpi_enter_sleep_state(u8 sleep_state)
 437 {
 438         acpi_status status;
 439
 440         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 441
 442         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 443             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 444                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
 445                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 446                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 447         }
 448
 449         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
 450         return_ACPI_STATUS(status);
 451 }
 452
 453 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 454
 455 /*******************************************************************************
 456  *
 457  * FUNCTION:    acpi_leave_sleep_state_prep
 458  *
 459  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 460  *
 461  * RETURN:      Status
 462  *
 463  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 464  *              sleep. Called with interrupts DISABLED.
 465  *              We break wake/resume into 2 stages so that OSPM can handle
 466  *              various OS-specific tasks between the two steps.
 467  *
 468  ******************************************************************************/
 469 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 470 {
 471         acpi_status status;
 472
 473         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 474
 475         status =
 476             acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID);
 477         return_ACPI_STATUS(status);
 478 }
 479
 480 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
 481
 482 /*******************************************************************************
 483  *
 484  * FUNCTION:    acpi_leave_sleep_state
 485  *
 486  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 487  *
 488  * RETURN:      Status
 489  *
 490  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 491  *              Called with interrupts ENABLED.
 492  *
 493  ******************************************************************************/
 494 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 495 {
 496         acpi_status status;
 497
 498         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 499
 500         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
 501         return_ACPI_STATUS(status);
 502 }
 503
 504 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)