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 - 2016, 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_vector(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_vector
  83  *      acpi_enter_sleep_state_s4bios
  84  */
  85
  86 #if (!ACPI_REDUCED_HARDWARE)
  87 /*******************************************************************************
  88  *
  89  * FUNCTION:    acpi_hw_set_firmware_waking_vector
  90  *
  91  * PARAMETERS:  facs                - Pointer to FACS table
  92  *              physical_address    - 32-bit physical address of ACPI real mode
  93  *                                    entry point
  94  *              physical_address64  - 64-bit physical address of ACPI protected
  95  *                                    mode entry point
  96  *
  97  * RETURN:      Status
  98  *
  99  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
 100  *
 101  ******************************************************************************/
 102
 103 static acpi_status
 104 acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
 105                                    acpi_physical_address physical_address,
 106                                    acpi_physical_address physical_address64)
 107 {
 108         ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector);
 109
 110
 111         /*
 112          * According to the ACPI specification 2.0c and later, the 64-bit
 113          * waking vector should be cleared and the 32-bit waking vector should
 114          * be used, unless we want the wake-up code to be called by the BIOS in
 115          * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
 116          * to fail to resume if the 64-bit vector is used.
 117          */
 118
 119         /* Set the 32-bit vector */
 120
 121         facs->firmware_waking_vector = (u32)physical_address;
 122
 123         if (facs->length > 32) {
 124                 if (facs->version >= 1) {
 125
 126                         /* Set the 64-bit vector */
 127
 128                         facs->xfirmware_waking_vector = physical_address64;
 129                 } else {
 130                         /* Clear the 64-bit vector if it exists */
 131
 132                         facs->xfirmware_waking_vector = 0;
 133                 }
 134         }
 135
 136         return_ACPI_STATUS(AE_OK);
 137 }
 138
 139 /*******************************************************************************
 140  *
 141  * FUNCTION:    acpi_set_firmware_waking_vector
 142  *
 143  * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
 144  *                                    entry point
 145  *              physical_address64  - 64-bit physical address of ACPI protected
 146  *                                    mode entry point
 147  *
 148  * RETURN:      Status
 149  *
 150  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
 151  *
 152  ******************************************************************************/
 153
 154 acpi_status
 155 acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
 156                                 acpi_physical_address physical_address64)
 157 {
 158
 159         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
 160
 161         if (acpi_gbl_FACS) {
 162                 (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_FACS,
 163                                                          physical_address,
 164                                                          physical_address64);
 165         }
 166
 167         return_ACPI_STATUS(AE_OK);
 168 }
 169
 170 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
 171
 172 /*******************************************************************************
 173  *
 174  * FUNCTION:    acpi_enter_sleep_state_s4bios
 175  *
 176  * PARAMETERS:  None
 177  *
 178  * RETURN:      Status
 179  *
 180  * DESCRIPTION: Perform a S4 bios request.
 181  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 182  *
 183  ******************************************************************************/
 184 acpi_status acpi_enter_sleep_state_s4bios(void)
 185 {
 186         u32 in_value;
 187         acpi_status status;
 188
 189         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 190
 191         /* Clear the wake status bit (PM1) */
 192
 193         status =
 194             acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
 195         if (ACPI_FAILURE(status)) {
 196                 return_ACPI_STATUS(status);
 197         }
 198
 199         status = acpi_hw_clear_acpi_status();
 200         if (ACPI_FAILURE(status)) {
 201                 return_ACPI_STATUS(status);
 202         }
 203
 204         /*
 205          * 1) Disable/Clear all GPEs
 206          * 2) Enable all wakeup GPEs
 207          */
 208         status = acpi_hw_disable_all_gpes();
 209         if (ACPI_FAILURE(status)) {
 210                 return_ACPI_STATUS(status);
 211         }
 212         acpi_gbl_system_awake_and_running = FALSE;
 213
 214         status = acpi_hw_enable_all_wakeup_gpes();
 215         if (ACPI_FAILURE(status)) {
 216                 return_ACPI_STATUS(status);
 217         }
 218
 219         ACPI_FLUSH_CPU_CACHE();
 220
 221         status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
 222                                     (u32)acpi_gbl_FADT.s4_bios_request, 8);
 223
 224         do {
 225                 acpi_os_stall(ACPI_USEC_PER_MSEC);
 226                 status =
 227                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 228                 if (ACPI_FAILURE(status)) {
 229                         return_ACPI_STATUS(status);
 230                 }
 231
 232         } while (!in_value);
 233
 234         return_ACPI_STATUS(AE_OK);
 235 }
 236
 237 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 238 #endif                          /* !ACPI_REDUCED_HARDWARE */
 239 /*******************************************************************************
 240  *
 241  * FUNCTION:    acpi_hw_sleep_dispatch
 242  *
 243  * PARAMETERS:  sleep_state         - Which sleep state to enter/exit
 244  *              function_id         - Sleep, wake_prep, or Wake
 245  *
 246  * RETURN:      Status from the invoked sleep handling function.
 247  *
 248  * DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
 249  *              function.
 250  *
 251  ******************************************************************************/
 252 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
 253 {
 254         acpi_status status;
 255         struct acpi_sleep_functions *sleep_functions =
 256             &acpi_sleep_dispatch[function_id];
 257
 258 #if (!ACPI_REDUCED_HARDWARE)
 259         /*
 260          * If the Hardware Reduced flag is set (from the FADT), we must
 261          * use the extended sleep registers (FADT). Note: As per the ACPI
 262          * specification, these extended registers are to be used for HW-reduced
 263          * platforms only. They are not general-purpose replacements for the
 264          * legacy PM register sleep support.
 265          */
 266         if (acpi_gbl_reduced_hardware) {
 267                 status = sleep_functions->extended_function(sleep_state);
 268         } else {
 269                 /* Legacy sleep */
 270
 271                 status = sleep_functions->legacy_function(sleep_state);
 272         }
 273
 274         return (status);
 275
 276 #else
 277         /*
 278          * For the case where reduced-hardware-only code is being generated,
 279          * we know that only the extended sleep registers are available
 280          */
 281         status = sleep_functions->extended_function(sleep_state);
 282         return (status);
 283
 284 #endif                          /* !ACPI_REDUCED_HARDWARE */
 285 }
 286
 287 /*******************************************************************************
 288  *
 289  * FUNCTION:    acpi_enter_sleep_state_prep
 290  *
 291  * PARAMETERS:  sleep_state         - Which sleep state to enter
 292  *
 293  * RETURN:      Status
 294  *
 295  * DESCRIPTION: Prepare to enter a system sleep state.
 296  *              This function must execute with interrupts enabled.
 297  *              We break sleeping into 2 stages so that OSPM can handle
 298  *              various OS-specific tasks between the two steps.
 299  *
 300  ******************************************************************************/
 301
 302 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 303 {
 304         acpi_status status;
 305         struct acpi_object_list arg_list;
 306         union acpi_object arg;
 307         u32 sst_value;
 308
 309         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 310
 311         status = acpi_get_sleep_type_data(sleep_state,
 312                                           &acpi_gbl_sleep_type_a,
 313                                           &acpi_gbl_sleep_type_b);
 314         if (ACPI_FAILURE(status)) {
 315                 return_ACPI_STATUS(status);
 316         }
 317
 318         /* Execute the _PTS method (Prepare To Sleep) */
 319
 320         arg_list.count = 1;
 321         arg_list.pointer = &arg;
 322         arg.type = ACPI_TYPE_INTEGER;
 323         arg.integer.value = sleep_state;
 324
 325         status =
 326             acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
 327         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 328                 return_ACPI_STATUS(status);
 329         }
 330
 331         /* Setup the argument to the _SST method (System STatus) */
 332
 333         switch (sleep_state) {
 334         case ACPI_STATE_S0:
 335
 336                 sst_value = ACPI_SST_WORKING;
 337                 break;
 338
 339         case ACPI_STATE_S1:
 340         case ACPI_STATE_S2:
 341         case ACPI_STATE_S3:
 342
 343                 sst_value = ACPI_SST_SLEEPING;
 344                 break;
 345
 346         case ACPI_STATE_S4:
 347
 348                 sst_value = ACPI_SST_SLEEP_CONTEXT;
 349                 break;
 350
 351         default:
 352
 353                 sst_value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 354                 break;
 355         }
 356
 357         /*
 358          * Set the system indicators to show the desired sleep state.
 359          * _SST is an optional method (return no error if not found)
 360          */
 361         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
 362         return_ACPI_STATUS(AE_OK);
 363 }
 364
 365 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 366
 367 /*******************************************************************************
 368  *
 369  * FUNCTION:    acpi_enter_sleep_state
 370  *
 371  * PARAMETERS:  sleep_state         - Which sleep state to enter
 372  *
 373  * RETURN:      Status
 374  *
 375  * DESCRIPTION: Enter a system sleep state
 376  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 377  *
 378  ******************************************************************************/
 379 acpi_status acpi_enter_sleep_state(u8 sleep_state)
 380 {
 381         acpi_status status;
 382
 383         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 384
 385         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 386             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 387                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
 388                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 389                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 390         }
 391
 392         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
 393         return_ACPI_STATUS(status);
 394 }
 395
 396 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 397
 398 /*******************************************************************************
 399  *
 400  * FUNCTION:    acpi_leave_sleep_state_prep
 401  *
 402  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 403  *
 404  * RETURN:      Status
 405  *
 406  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 407  *              sleep. Called with interrupts DISABLED.
 408  *              We break wake/resume into 2 stages so that OSPM can handle
 409  *              various OS-specific tasks between the two steps.
 410  *
 411  ******************************************************************************/
 412 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 413 {
 414         acpi_status status;
 415
 416         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 417
 418         status =
 419             acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID);
 420         return_ACPI_STATUS(status);
 421 }
 422
 423 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
 424
 425 /*******************************************************************************
 426  *
 427  * FUNCTION:    acpi_leave_sleep_state
 428  *
 429  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 430  *
 431  * RETURN:      Status
 432  *
 433  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 434  *              Called with interrupts ENABLED.
 435  *
 436  ******************************************************************************/
 437 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 438 {
 439         acpi_status status;
 440
 441         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 442
 443         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
 444         return_ACPI_STATUS(status);
 445 }
 446
 447 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)