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 - 2012, 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 <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include <linux/module.h>
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49 ACPI_MODULE_NAME("hwxfsleep")
  50
  51 /* Local prototypes */
  52 static acpi_status
  53 acpi_hw_sleep_dispatch(u8 sleep_state, u8 flags, u32 function_id);
  54
  55 /*
  56  * Dispatch table used to efficiently branch to the various sleep
  57  * functions.
  58  */
  59 #define ACPI_SLEEP_FUNCTION_ID         0
  60 #define ACPI_WAKE_PREP_FUNCTION_ID     1
  61 #define ACPI_WAKE_FUNCTION_ID          2
  62
  63 /* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */
  64
  65 static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
  66         {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep),
  67          acpi_hw_extended_sleep},
  68         {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep),
  69          acpi_hw_extended_wake_prep},
  70         {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake), acpi_hw_extended_wake}
  71 };
  72
  73 /*
  74  * These functions are removed for the ACPI_REDUCED_HARDWARE case:
  75  *      acpi_set_firmware_waking_vector
  76  *      acpi_set_firmware_waking_vector64
  77  *      acpi_enter_sleep_state_s4bios
  78  */
  79
  80 #if (!ACPI_REDUCED_HARDWARE)
  81 /*******************************************************************************
  82  *
  83  * FUNCTION:    acpi_set_firmware_waking_vector
  84  *
  85  * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
  86  *                                    entry point.
  87  *
  88  * RETURN:      Status
  89  *
  90  * DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS
  91  *
  92  ******************************************************************************/
  93
  94 acpi_status acpi_set_firmware_waking_vector(u32 physical_address)
  95 {
  96         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
  97
  98
  99         /*
 100          * According to the ACPI specification 2.0c and later, the 64-bit
 101          * waking vector should be cleared and the 32-bit waking vector should
 102          * be used, unless we want the wake-up code to be called by the BIOS in
 103          * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
 104          * to fail to resume if the 64-bit vector is used.
 105          */
 106
 107         /* Set the 32-bit vector */
 108
 109         acpi_gbl_FACS->firmware_waking_vector = physical_address;
 110
 111         /* Clear the 64-bit vector if it exists */
 112
 113         if ((acpi_gbl_FACS->length > 32) && (acpi_gbl_FACS->version >= 1)) {
 114                 acpi_gbl_FACS->xfirmware_waking_vector = 0;
 115         }
 116
 117         return_ACPI_STATUS(AE_OK);
 118 }
 119
 120 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
 121
 122 #if ACPI_MACHINE_WIDTH == 64
 123 /*******************************************************************************
 124  *
 125  * FUNCTION:    acpi_set_firmware_waking_vector64
 126  *
 127  * PARAMETERS:  physical_address    - 64-bit physical address of ACPI protected
 128  *                                    mode entry point.
 129  *
 130  * RETURN:      Status
 131  *
 132  * DESCRIPTION: Sets the 64-bit X_firmware_waking_vector field of the FACS, if
 133  *              it exists in the table. This function is intended for use with
 134  *              64-bit host operating systems.
 135  *
 136  ******************************************************************************/
 137 acpi_status acpi_set_firmware_waking_vector64(u64 physical_address)
 138 {
 139         ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector64);
 140
 141
 142         /* Determine if the 64-bit vector actually exists */
 143
 144         if ((acpi_gbl_FACS->length <= 32) || (acpi_gbl_FACS->version < 1)) {
 145                 return_ACPI_STATUS(AE_NOT_EXIST);
 146         }
 147
 148         /* Clear 32-bit vector, set the 64-bit X_ vector */
 149
 150         acpi_gbl_FACS->firmware_waking_vector = 0;
 151         acpi_gbl_FACS->xfirmware_waking_vector = physical_address;
 152         return_ACPI_STATUS(AE_OK);
 153 }
 154
 155 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64)
 156 #endif
 157
 158 /*******************************************************************************
 159  *
 160  * FUNCTION:    acpi_enter_sleep_state_s4bios
 161  *
 162  * PARAMETERS:  None
 163  *
 164  * RETURN:      Status
 165  *
 166  * DESCRIPTION: Perform a S4 bios request.
 167  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 168  *
 169  ******************************************************************************/
 170 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
 171 {
 172         u32 in_value;
 173         acpi_status status;
 174
 175         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
 176
 177         /* Clear the wake status bit (PM1) */
 178
 179         status =
 180             acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
 181         if (ACPI_FAILURE(status)) {
 182                 return_ACPI_STATUS(status);
 183         }
 184
 185         status = acpi_hw_clear_acpi_status();
 186         if (ACPI_FAILURE(status)) {
 187                 return_ACPI_STATUS(status);
 188         }
 189
 190         /*
 191          * 1) Disable/Clear all GPEs
 192          * 2) Enable all wakeup GPEs
 193          */
 194         status = acpi_hw_disable_all_gpes();
 195         if (ACPI_FAILURE(status)) {
 196                 return_ACPI_STATUS(status);
 197         }
 198         acpi_gbl_system_awake_and_running = FALSE;
 199
 200         status = acpi_hw_enable_all_wakeup_gpes();
 201         if (ACPI_FAILURE(status)) {
 202                 return_ACPI_STATUS(status);
 203         }
 204
 205         ACPI_FLUSH_CPU_CACHE();
 206
 207         status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
 208                                     (u32)acpi_gbl_FADT.s4_bios_request, 8);
 209
 210         do {
 211                 acpi_os_stall(1000);
 212                 status =
 213                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 214                 if (ACPI_FAILURE(status)) {
 215                         return_ACPI_STATUS(status);
 216                 }
 217         } while (!in_value);
 218
 219         return_ACPI_STATUS(AE_OK);
 220 }
 221
 222 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 223 #endif                          /* !ACPI_REDUCED_HARDWARE */
 224 /*******************************************************************************
 225  *
 226  * FUNCTION:    acpi_hw_sleep_dispatch
 227  *
 228  * PARAMETERS:  sleep_state         - Which sleep state to enter/exit
 229  *              function_id         - Sleep, wake_prep, or Wake
 230  *
 231  * RETURN:      Status from the invoked sleep handling function.
 232  *
 233  * DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
 234  *              function.
 235  *
 236  ******************************************************************************/
 237 static acpi_status
 238 acpi_hw_sleep_dispatch(u8 sleep_state, u8 flags, u32 function_id)
 239 {
 240         acpi_status status;
 241         struct acpi_sleep_functions *sleep_functions =
 242             &acpi_sleep_dispatch[function_id];
 243
 244 #if (!ACPI_REDUCED_HARDWARE)
 245
 246         /*
 247          * If the Hardware Reduced flag is set (from the FADT), we must
 248          * use the extended sleep registers
 249          */
 250         if (acpi_gbl_reduced_hardware || acpi_gbl_FADT.sleep_control.address) {
 251                 status = sleep_functions->extended_function(sleep_state, flags);
 252         } else {
 253                 /* Legacy sleep */
 254
 255                 status = sleep_functions->legacy_function(sleep_state, flags);
 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, flags);
 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                 sst_value = ACPI_SST_WORKING;
 320                 break;
 321
 322         case ACPI_STATE_S1:
 323         case ACPI_STATE_S2:
 324         case ACPI_STATE_S3:
 325                 sst_value = ACPI_SST_SLEEPING;
 326                 break;
 327
 328         case ACPI_STATE_S4:
 329                 sst_value = ACPI_SST_SLEEP_CONTEXT;
 330                 break;
 331
 332         default:
 333                 sst_value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 334                 break;
 335         }
 336
 337         /*
 338          * Set the system indicators to show the desired sleep state.
 339          * _SST is an optional method (return no error if not found)
 340          */
 341         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
 342         return_ACPI_STATUS(AE_OK);
 343 }
 344
 345 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 346
 347 /*******************************************************************************
 348  *
 349  * FUNCTION:    acpi_enter_sleep_state
 350  *
 351  * PARAMETERS:  sleep_state         - Which sleep state to enter
 352  *              flags               - ACPI_EXECUTE_GTS to run optional method
 353  *
 354  * RETURN:      Status
 355  *
 356  * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 357  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 358  *
 359  ******************************************************************************/
 360 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state, u8 flags)
 361 {
 362         acpi_status status;
 363
 364         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 365
 366         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 367             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 368                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
 369                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 370                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 371         }
 372
 373         status =
 374             acpi_hw_sleep_dispatch(sleep_state, flags, ACPI_SLEEP_FUNCTION_ID);
 375         return_ACPI_STATUS(status);
 376 }
 377
 378 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 379
 380 /*******************************************************************************
 381  *
 382  * FUNCTION:    acpi_leave_sleep_state_prep
 383  *
 384  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 385  *              flags               - ACPI_EXECUTE_BFS to run optional method
 386  *
 387  * RETURN:      Status
 388  *
 389  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 390  *              sleep.
 391  *              Called with interrupts DISABLED.
 392  *
 393  ******************************************************************************/
 394 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state, u8 flags)
 395 {
 396         acpi_status status;
 397
 398         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 399
 400         status =
 401             acpi_hw_sleep_dispatch(sleep_state, flags,
 402                                    ACPI_WAKE_PREP_FUNCTION_ID);
 403         return_ACPI_STATUS(status);
 404 }
 405
 406 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
 407
 408 /*******************************************************************************
 409  *
 410  * FUNCTION:    acpi_leave_sleep_state
 411  *
 412  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 413  *
 414  * RETURN:      Status
 415  *
 416  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 417  *              Called with interrupts ENABLED.
 418  *
 419  ******************************************************************************/
 420 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 421 {
 422         acpi_status status;
 423
 424         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 425
 426
 427         status = acpi_hw_sleep_dispatch(sleep_state, 0, ACPI_WAKE_FUNCTION_ID);
 428         return_ACPI_STATUS(status);
 429 }
 430
 431 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)