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 - 2018, 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_STRUCT_INIT(legacy_function,
  74                           ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep)),
  75          ACPI_STRUCT_INIT(extended_function,
  76                           acpi_hw_extended_sleep)},
  77         {ACPI_STRUCT_INIT(legacy_function,
  78                           ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep)),
  79          ACPI_STRUCT_INIT(extended_function,
  80                           acpi_hw_extended_wake_prep)},
  81         {ACPI_STRUCT_INIT(legacy_function,
  82                           ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake)),
  83          ACPI_STRUCT_INIT(extended_function,
  84                           acpi_hw_extended_wake)}
  85 };
  86
  87 /*
  88  * These functions are removed for the ACPI_REDUCED_HARDWARE case:
  89  *      acpi_set_firmware_waking_vector
  90  *      acpi_enter_sleep_state_s4bios
  91  */
  92
  93 #if (!ACPI_REDUCED_HARDWARE)
  94 /*******************************************************************************
  95  *
  96  * FUNCTION:    acpi_hw_set_firmware_waking_vector
  97  *
  98  * PARAMETERS:  facs                - Pointer to FACS table
  99  *              physical_address    - 32-bit physical address of ACPI real mode
 100  *                                    entry point
 101  *              physical_address64  - 64-bit physical address of ACPI protected
 102  *                                    mode entry point
 103  *
 104  * RETURN:      Status
 105  *
 106  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
 107  *
 108  ******************************************************************************/
 109
 110 static acpi_status
 111 acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
 112                                    acpi_physical_address physical_address,
 113                                    acpi_physical_address physical_address64)
 114 {
 115         ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector);
 116
 117
 118         /*
 119          * According to the ACPI specification 2.0c and later, the 64-bit
 120          * waking vector should be cleared and the 32-bit waking vector should
 121          * be used, unless we want the wake-up code to be called by the BIOS in
 122          * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
 123          * to fail to resume if the 64-bit vector is used.
 124          */
 125
 126         /* Set the 32-bit vector */
 127
 128         facs->firmware_waking_vector = (u32)physical_address;
 129
 130         if (facs->length > 32) {
 131                 if (facs->version >= 1) {
 132
 133                         /* Set the 64-bit vector */
 134
 135                         facs->xfirmware_waking_vector = physical_address64;
 136                 } else {
 137                         /* Clear the 64-bit vector if it exists */
 138
 139                         facs->xfirmware_waking_vector = 0;
 140                 }
 141         }
 142
 143         return_ACPI_STATUS(AE_OK);
 144 }
 145
 146 /*******************************************************************************
 147  *
 148  * FUNCTION:    acpi_set_firmware_waking_vector
 149  *
 150  * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
 151  *                                    entry point
 152  *              physical_address64  - 64-bit physical address of ACPI protected
 153  *                                    mode entry point
 154  *
 155  * RETURN:      Status
 156  *
 157  * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
 158  *
 159  ******************************************************************************/
 160
 161 acpi_status
 162 acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
 163                                 acpi_physical_address physical_address64)
 164 {
 165
 166         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
 167
 168         if (acpi_gbl_FACS) {
 169                 (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_FACS,
 170                                                          physical_address,
 171                                                          physical_address64);
 172         }
 173
 174         return_ACPI_STATUS(AE_OK);
 175 }
 176
 177 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
 178
 179 /*******************************************************************************
 180  *
 181  * FUNCTION:    acpi_enter_sleep_state_s4bios
 182  *
 183  * PARAMETERS:  None
 184  *
 185  * RETURN:      Status
 186  *
 187  * DESCRIPTION: Perform a S4 bios request.
 188  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 189  *
 190  ******************************************************************************/
 191 acpi_status acpi_enter_sleep_state_s4bios(void)
 192 {
 193         u32 in_value;
 194         acpi_status status;
 195
 196         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 197
 198         /* Clear the wake status bit (PM1) */
 199
 200         status =
 201             acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
 202         if (ACPI_FAILURE(status)) {
 203                 return_ACPI_STATUS(status);
 204         }
 205
 206         status = acpi_hw_clear_acpi_status();
 207         if (ACPI_FAILURE(status)) {
 208                 return_ACPI_STATUS(status);
 209         }
 210
 211         /*
 212          * 1) Disable/Clear all GPEs
 213          * 2) Enable all wakeup GPEs
 214          */
 215         status = acpi_hw_disable_all_gpes();
 216         if (ACPI_FAILURE(status)) {
 217                 return_ACPI_STATUS(status);
 218         }
 219         acpi_gbl_system_awake_and_running = FALSE;
 220
 221         status = acpi_hw_enable_all_wakeup_gpes();
 222         if (ACPI_FAILURE(status)) {
 223                 return_ACPI_STATUS(status);
 224         }
 225
 226         ACPI_FLUSH_CPU_CACHE();
 227
 228         status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
 229                                     (u32)acpi_gbl_FADT.s4_bios_request, 8);
 230
 231         do {
 232                 acpi_os_stall(ACPI_USEC_PER_MSEC);
 233                 status =
 234                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 235                 if (ACPI_FAILURE(status)) {
 236                         return_ACPI_STATUS(status);
 237                 }
 238
 239         } while (!in_value);
 240
 241         return_ACPI_STATUS(AE_OK);
 242 }
 243
 244 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 245 #endif                          /* !ACPI_REDUCED_HARDWARE */
 246 /*******************************************************************************
 247  *
 248  * FUNCTION:    acpi_hw_sleep_dispatch
 249  *
 250  * PARAMETERS:  sleep_state         - Which sleep state to enter/exit
 251  *              function_id         - Sleep, wake_prep, or Wake
 252  *
 253  * RETURN:      Status from the invoked sleep handling function.
 254  *
 255  * DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
 256  *              function.
 257  *
 258  ******************************************************************************/
 259 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
 260 {
 261         acpi_status status;
 262         struct acpi_sleep_functions *sleep_functions =
 263             &acpi_sleep_dispatch[function_id];
 264
 265 #if (!ACPI_REDUCED_HARDWARE)
 266         /*
 267          * If the Hardware Reduced flag is set (from the FADT), we must
 268          * use the extended sleep registers (FADT). Note: As per the ACPI
 269          * specification, these extended registers are to be used for HW-reduced
 270          * platforms only. They are not general-purpose replacements for the
 271          * legacy PM register sleep support.
 272          */
 273         if (acpi_gbl_reduced_hardware) {
 274                 status = sleep_functions->extended_function(sleep_state);
 275         } else {
 276                 /* Legacy sleep */
 277
 278                 status = sleep_functions->legacy_function(sleep_state);
 279         }
 280
 281         return (status);
 282
 283 #else
 284         /*
 285          * For the case where reduced-hardware-only code is being generated,
 286          * we know that only the extended sleep registers are available
 287          */
 288         status = sleep_functions->extended_function(sleep_state);
 289         return (status);
 290
 291 #endif                          /* !ACPI_REDUCED_HARDWARE */
 292 }
 293
 294 /*******************************************************************************
 295  *
 296  * FUNCTION:    acpi_enter_sleep_state_prep
 297  *
 298  * PARAMETERS:  sleep_state         - Which sleep state to enter
 299  *
 300  * RETURN:      Status
 301  *
 302  * DESCRIPTION: Prepare to enter a system sleep state.
 303  *              This function must execute with interrupts enabled.
 304  *              We break sleeping into 2 stages so that OSPM can handle
 305  *              various OS-specific tasks between the two steps.
 306  *
 307  ******************************************************************************/
 308
 309 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 310 {
 311         acpi_status status;
 312         struct acpi_object_list arg_list;
 313         union acpi_object arg;
 314         u32 sst_value;
 315
 316         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 317
 318         status = acpi_get_sleep_type_data(sleep_state,
 319                                           &acpi_gbl_sleep_type_a,
 320                                           &acpi_gbl_sleep_type_b);
 321         if (ACPI_FAILURE(status)) {
 322                 return_ACPI_STATUS(status);
 323         }
 324
 325         /* Execute the _PTS method (Prepare To Sleep) */
 326
 327         arg_list.count = 1;
 328         arg_list.pointer = &arg;
 329         arg.type = ACPI_TYPE_INTEGER;
 330         arg.integer.value = sleep_state;
 331
 332         status =
 333             acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
 334         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 335                 return_ACPI_STATUS(status);
 336         }
 337
 338         /* Setup the argument to the _SST method (System STatus) */
 339
 340         switch (sleep_state) {
 341         case ACPI_STATE_S0:
 342
 343                 sst_value = ACPI_SST_WORKING;
 344                 break;
 345
 346         case ACPI_STATE_S1:
 347         case ACPI_STATE_S2:
 348         case ACPI_STATE_S3:
 349
 350                 sst_value = ACPI_SST_SLEEPING;
 351                 break;
 352
 353         case ACPI_STATE_S4:
 354
 355                 sst_value = ACPI_SST_SLEEP_CONTEXT;
 356                 break;
 357
 358         default:
 359
 360                 sst_value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 361                 break;
 362         }
 363
 364         /*
 365          * Set the system indicators to show the desired sleep state.
 366          * _SST is an optional method (return no error if not found)
 367          */
 368         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
 369         return_ACPI_STATUS(AE_OK);
 370 }
 371
 372 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 373
 374 /*******************************************************************************
 375  *
 376  * FUNCTION:    acpi_enter_sleep_state
 377  *
 378  * PARAMETERS:  sleep_state         - Which sleep state to enter
 379  *
 380  * RETURN:      Status
 381  *
 382  * DESCRIPTION: Enter a system sleep state
 383  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 384  *
 385  ******************************************************************************/
 386 acpi_status acpi_enter_sleep_state(u8 sleep_state)
 387 {
 388         acpi_status status;
 389
 390         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 391
 392         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 393             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 394                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
 395                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 396                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 397         }
 398
 399         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
 400         return_ACPI_STATUS(status);
 401 }
 402
 403 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 404
 405 /*******************************************************************************
 406  *
 407  * FUNCTION:    acpi_leave_sleep_state_prep
 408  *
 409  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 410  *
 411  * RETURN:      Status
 412  *
 413  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 414  *              sleep. Called with interrupts DISABLED.
 415  *              We break wake/resume into 2 stages so that OSPM can handle
 416  *              various OS-specific tasks between the two steps.
 417  *
 418  ******************************************************************************/
 419 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 420 {
 421         acpi_status status;
 422
 423         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 424
 425         status =
 426             acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID);
 427         return_ACPI_STATUS(status);
 428 }
 429
 430 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
 431
 432 /*******************************************************************************
 433  *
 434  * FUNCTION:    acpi_leave_sleep_state
 435  *
 436  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 437  *
 438  * RETURN:      Status
 439  *
 440  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 441  *              Called with interrupts ENABLED.
 442  *
 443  ******************************************************************************/
 444 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 445 {
 446         acpi_status status;
 447
 448         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 449
 450         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
 451         return_ACPI_STATUS(status);
 452 }
 453
 454 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)