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 - 2013, 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 #include <linux/export.h>
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49 ACPI_MODULE_NAME("hwxfsleep")
  50
  51 /* Local prototypes */
  52 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id);
  53
  54 /*
  55  * Dispatch table used to efficiently branch to the various sleep
  56  * functions.
  57  */
  58 #define ACPI_SLEEP_FUNCTION_ID         0
  59 #define ACPI_WAKE_PREP_FUNCTION_ID     1
  60 #define ACPI_WAKE_FUNCTION_ID          2
  61
  62 /* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */
  63
  64 static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
  65         {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep),
  66          acpi_hw_extended_sleep},
  67         {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep),
  68          acpi_hw_extended_wake_prep},
  69         {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake), acpi_hw_extended_wake}
  70 };
  71
  72 /*
  73  * These functions are removed for the ACPI_REDUCED_HARDWARE case:
  74  *      acpi_set_firmware_waking_vector
  75  *      acpi_set_firmware_waking_vector64
  76  *      acpi_enter_sleep_state_s4bios
  77  */
  78
  79 #if (!ACPI_REDUCED_HARDWARE)
  80 /*******************************************************************************
  81  *
  82  * FUNCTION:    acpi_set_firmware_waking_vector
  83  *
  84  * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
  85  *                                    entry point.
  86  *
  87  * RETURN:      Status
  88  *
  89  * DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS
  90  *
  91  ******************************************************************************/
  92
  93 acpi_status acpi_set_firmware_waking_vector(u32 physical_address)
  94 {
  95         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
  96
  97
  98         /*
  99          * According to the ACPI specification 2.0c and later, the 64-bit
 100          * waking vector should be cleared and the 32-bit waking vector should
 101          * be used, unless we want the wake-up code to be called by the BIOS in
 102          * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
 103          * to fail to resume if the 64-bit vector is used.
 104          */
 105
 106         /* Set the 32-bit vector */
 107
 108         acpi_gbl_FACS->firmware_waking_vector = physical_address;
 109
 110         /* Clear the 64-bit vector if it exists */
 111
 112         if ((acpi_gbl_FACS->length > 32) && (acpi_gbl_FACS->version >= 1)) {
 113                 acpi_gbl_FACS->xfirmware_waking_vector = 0;
 114         }
 115
 116         return_ACPI_STATUS(AE_OK);
 117 }
 118
 119 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
 120
 121 #if ACPI_MACHINE_WIDTH == 64
 122 /*******************************************************************************
 123  *
 124  * FUNCTION:    acpi_set_firmware_waking_vector64
 125  *
 126  * PARAMETERS:  physical_address    - 64-bit physical address of ACPI protected
 127  *                                    mode entry point.
 128  *
 129  * RETURN:      Status
 130  *
 131  * DESCRIPTION: Sets the 64-bit X_firmware_waking_vector field of the FACS, if
 132  *              it exists in the table. This function is intended for use with
 133  *              64-bit host operating systems.
 134  *
 135  ******************************************************************************/
 136 acpi_status acpi_set_firmware_waking_vector64(u64 physical_address)
 137 {
 138         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector64);
 139
 140
 141         /* Determine if the 64-bit vector actually exists */
 142
 143         if ((acpi_gbl_FACS->length <= 32) || (acpi_gbl_FACS->version < 1)) {
 144                 return_ACPI_STATUS(AE_NOT_EXIST);
 145         }
 146
 147         /* Clear 32-bit vector, set the 64-bit X_ vector */
 148
 149         acpi_gbl_FACS->firmware_waking_vector = 0;
 150         acpi_gbl_FACS->xfirmware_waking_vector = physical_address;
 151         return_ACPI_STATUS(AE_OK);
 152 }
 153
 154 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64)
 155 #endif
 156
 157 /*******************************************************************************
 158  *
 159  * FUNCTION:    acpi_enter_sleep_state_s4bios
 160  *
 161  * PARAMETERS:  None
 162  *
 163  * RETURN:      Status
 164  *
 165  * DESCRIPTION: Perform a S4 bios request.
 166  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 167  *
 168  ******************************************************************************/
 169 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
 170 {
 171         u32 in_value;
 172         acpi_status status;
 173
 174         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 175
 176         /* Clear the wake status bit (PM1) */
 177
 178         status =
 179             acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
 180         if (ACPI_FAILURE(status)) {
 181                 return_ACPI_STATUS(status);
 182         }
 183
 184         status = acpi_hw_clear_acpi_status();
 185         if (ACPI_FAILURE(status)) {
 186                 return_ACPI_STATUS(status);
 187         }
 188
 189         /*
 190          * 1) Disable/Clear all GPEs
 191          * 2) Enable all wakeup GPEs
 192          */
 193         status = acpi_hw_disable_all_gpes();
 194         if (ACPI_FAILURE(status)) {
 195                 return_ACPI_STATUS(status);
 196         }
 197         acpi_gbl_system_awake_and_running = FALSE;
 198
 199         status = acpi_hw_enable_all_wakeup_gpes();
 200         if (ACPI_FAILURE(status)) {
 201                 return_ACPI_STATUS(status);
 202         }
 203
 204         ACPI_FLUSH_CPU_CACHE();
 205
 206         status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
 207                                     (u32)acpi_gbl_FADT.s4_bios_request, 8);
 208
 209         do {
 210                 acpi_os_stall(ACPI_USEC_PER_MSEC);
 211                 status =
 212                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 213                 if (ACPI_FAILURE(status)) {
 214                         return_ACPI_STATUS(status);
 215                 }
 216         } while (!in_value);
 217
 218         return_ACPI_STATUS(AE_OK);
 219 }
 220
 221 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 222 #endif                          /* !ACPI_REDUCED_HARDWARE */
 223 /*******************************************************************************
 224  *
 225  * FUNCTION:    acpi_hw_sleep_dispatch
 226  *
 227  * PARAMETERS:  sleep_state         - Which sleep state to enter/exit
 228  *              function_id         - Sleep, wake_prep, or Wake
 229  *
 230  * RETURN:      Status from the invoked sleep handling function.
 231  *
 232  * DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
 233  *              function.
 234  *
 235  ******************************************************************************/
 236 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
 237 {
 238         acpi_status status;
 239         struct acpi_sleep_functions *sleep_functions =
 240             &acpi_sleep_dispatch[function_id];
 241
 242 #if (!ACPI_REDUCED_HARDWARE)
 243         /*
 244          * If the Hardware Reduced flag is set (from the FADT), we must
 245          * use the extended sleep registers (FADT). Note: As per the ACPI
 246          * specification, these extended registers are to be used for HW-reduced
 247          * platforms only. They are not general-purpose replacements for the
 248          * legacy PM register sleep support.
 249          */
 250         if (acpi_gbl_reduced_hardware) {
 251                 status = sleep_functions->extended_function(sleep_state);
 252         } else {
 253                 /* Legacy sleep */
 254
 255                 status = sleep_functions->legacy_function(sleep_state);
 256         }
 257
 258         return (status);
 259
 260 #else
 261         /*
 262          * For the case where reduced-hardware-only code is being generated,
 263          * we know that only the extended sleep registers are available
 264          */
 265         status = sleep_functions->extended_function(sleep_state);
 266         return (status);
 267
 268 #endif                          /* !ACPI_REDUCED_HARDWARE */
 269 }
 270
 271 /*******************************************************************************
 272  *
 273  * FUNCTION:    acpi_enter_sleep_state_prep
 274  *
 275  * PARAMETERS:  sleep_state         - Which sleep state to enter
 276  *
 277  * RETURN:      Status
 278  *
 279  * DESCRIPTION: Prepare to enter a system sleep state.
 280  *              This function must execute with interrupts enabled.
 281  *              We break sleeping into 2 stages so that OSPM can handle
 282  *              various OS-specific tasks between the two steps.
 283  *
 284  ******************************************************************************/
 285
 286 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 287 {
 288         acpi_status status;
 289         struct acpi_object_list arg_list;
 290         union acpi_object arg;
 291         u32 sst_value;
 292
 293         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 294
 295         status = acpi_get_sleep_type_data(sleep_state,
 296                                           &acpi_gbl_sleep_type_a,
 297                                           &acpi_gbl_sleep_type_b);
 298         if (ACPI_FAILURE(status)) {
 299                 return_ACPI_STATUS(status);
 300         }
 301
 302         /* Execute the _PTS method (Prepare To Sleep) */
 303
 304         arg_list.count = 1;
 305         arg_list.pointer = &arg;
 306         arg.type = ACPI_TYPE_INTEGER;
 307         arg.integer.value = sleep_state;
 308
 309         status =
 310             acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
 311         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 312                 return_ACPI_STATUS(status);
 313         }
 314
 315         /* Setup the argument to the _SST method (System STatus) */
 316
 317         switch (sleep_state) {
 318         case ACPI_STATE_S0:
 319
 320                 sst_value = ACPI_SST_WORKING;
 321                 break;
 322
 323         case ACPI_STATE_S1:
 324         case ACPI_STATE_S2:
 325         case ACPI_STATE_S3:
 326
 327                 sst_value = ACPI_SST_SLEEPING;
 328                 break;
 329
 330         case ACPI_STATE_S4:
 331
 332                 sst_value = ACPI_SST_SLEEP_CONTEXT;
 333                 break;
 334
 335         default:
 336
 337                 sst_value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 338                 break;
 339         }
 340
 341         /*
 342          * Set the system indicators to show the desired sleep state.
 343          * _SST is an optional method (return no error if not found)
 344          */
 345         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
 346         return_ACPI_STATUS(AE_OK);
 347 }
 348
 349 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 350
 351 /*******************************************************************************
 352  *
 353  * FUNCTION:    acpi_enter_sleep_state
 354  *
 355  * PARAMETERS:  sleep_state         - Which sleep state to enter
 356  *
 357  * RETURN:      Status
 358  *
 359  * DESCRIPTION: Enter a system sleep state
 360  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 361  *
 362  ******************************************************************************/
 363 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 364 {
 365         acpi_status status;
 366
 367         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 368
 369         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 370             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 371                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
 372                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 373                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 374         }
 375
 376         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
 377         return_ACPI_STATUS(status);
 378 }
 379
 380 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 381
 382 /*******************************************************************************
 383  *
 384  * FUNCTION:    acpi_leave_sleep_state_prep
 385  *
 386  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 387  *
 388  * RETURN:      Status
 389  *
 390  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 391  *              sleep. Called with interrupts DISABLED.
 392  *              We break wake/resume into 2 stages so that OSPM can handle
 393  *              various OS-specific tasks between the two steps.
 394  *
 395  ******************************************************************************/
 396 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 397 {
 398         acpi_status status;
 399
 400         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 401
 402         status =
 403             acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID);
 404         return_ACPI_STATUS(status);
 405 }
 406
 407 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
 408
 409 /*******************************************************************************
 410  *
 411  * FUNCTION:    acpi_leave_sleep_state
 412  *
 413  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 414  *
 415  * RETURN:      Status
 416  *
 417  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 418  *              Called with interrupts ENABLED.
 419  *
 420  ******************************************************************************/
 421 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 422 {
 423         acpi_status status;
 424
 425         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 426
 427         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
 428         return_ACPI_STATUS(status);
 429 }
 430
 431 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)