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         /*
 245          * If the Hardware Reduced flag is set (from the FADT), we must
 246          * use the extended sleep registers
 247          */
 248         if (acpi_gbl_reduced_hardware || acpi_gbl_FADT.sleep_control.address) {
 249                 status = sleep_functions->extended_function(sleep_state);
 250         } else {
 251                 /* Legacy sleep */
 252
 253                 status = sleep_functions->legacy_function(sleep_state);
 254         }
 255
 256         return (status);
 257
 258 #else
 259         /*
 260          * For the case where reduced-hardware-only code is being generated,
 261          * we know that only the extended sleep registers are available
 262          */
 263         status = sleep_functions->extended_function(sleep_state);
 264         return (status);
 265
 266 #endif                          /* !ACPI_REDUCED_HARDWARE */
 267 }
 268
 269 /*******************************************************************************
 270  *
 271  * FUNCTION:    acpi_enter_sleep_state_prep
 272  *
 273  * PARAMETERS:  sleep_state         - Which sleep state to enter
 274  *
 275  * RETURN:      Status
 276  *
 277  * DESCRIPTION: Prepare to enter a system sleep state.
 278  *              This function must execute with interrupts enabled.
 279  *              We break sleeping into 2 stages so that OSPM can handle
 280  *              various OS-specific tasks between the two steps.
 281  *
 282  ******************************************************************************/
 283
 284 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 285 {
 286         acpi_status status;
 287         struct acpi_object_list arg_list;
 288         union acpi_object arg;
 289         u32 sst_value;
 290
 291         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
 292
 293         status = acpi_get_sleep_type_data(sleep_state,
 294                                           &acpi_gbl_sleep_type_a,
 295                                           &acpi_gbl_sleep_type_b);
 296         if (ACPI_FAILURE(status)) {
 297                 return_ACPI_STATUS(status);
 298         }
 299
 300         /* Execute the _PTS method (Prepare To Sleep) */
 301
 302         arg_list.count = 1;
 303         arg_list.pointer = &arg;
 304         arg.type = ACPI_TYPE_INTEGER;
 305         arg.integer.value = sleep_state;
 306
 307         status =
 308             acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
 309         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 310                 return_ACPI_STATUS(status);
 311         }
 312
 313         /* Setup the argument to the _SST method (System STatus) */
 314
 315         switch (sleep_state) {
 316         case ACPI_STATE_S0:
 317                 sst_value = ACPI_SST_WORKING;
 318                 break;
 319
 320         case ACPI_STATE_S1:
 321         case ACPI_STATE_S2:
 322         case ACPI_STATE_S3:
 323                 sst_value = ACPI_SST_SLEEPING;
 324                 break;
 325
 326         case ACPI_STATE_S4:
 327                 sst_value = ACPI_SST_SLEEP_CONTEXT;
 328                 break;
 329
 330         default:
 331                 sst_value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
 332                 break;
 333         }
 334
 335         /*
 336          * Set the system indicators to show the desired sleep state.
 337          * _SST is an optional method (return no error if not found)
 338          */
 339         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
 340         return_ACPI_STATUS(AE_OK);
 341 }
 342
 343 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
 344
 345 /*******************************************************************************
 346  *
 347  * FUNCTION:    acpi_enter_sleep_state
 348  *
 349  * PARAMETERS:  sleep_state         - Which sleep state to enter
 350  *
 351  * RETURN:      Status
 352  *
 353  * DESCRIPTION: Enter a system sleep state
 354  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 355  *
 356  ******************************************************************************/
 357 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 358 {
 359         acpi_status status;
 360
 361         ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
 362
 363         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 364             (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 365                 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
 366                             acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 367                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 368         }
 369
 370         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
 371         return_ACPI_STATUS(status);
 372 }
 373
 374 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
 375
 376 /*******************************************************************************
 377  *
 378  * FUNCTION:    acpi_leave_sleep_state_prep
 379  *
 380  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 381  *
 382  * RETURN:      Status
 383  *
 384  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 385  *              sleep. Called with interrupts DISABLED.
 386  *              We break wake/resume into 2 stages so that OSPM can handle
 387  *              various OS-specific tasks between the two steps.
 388  *
 389  ******************************************************************************/
 390 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 391 {
 392         acpi_status status;
 393
 394         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 395
 396         status =
 397             acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID);
 398         return_ACPI_STATUS(status);
 399 }
 400
 401 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
 402
 403 /*******************************************************************************
 404  *
 405  * FUNCTION:    acpi_leave_sleep_state
 406  *
 407  * PARAMETERS:  sleep_state         - Which sleep state we are exiting
 408  *
 409  * RETURN:      Status
 410  *
 411  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 412  *              Called with interrupts ENABLED.
 413  *
 414  ******************************************************************************/
 415 acpi_status acpi_leave_sleep_state(u8 sleep_state)
 416 {
 417         acpi_status status;
 418
 419         ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
 420
 421         status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
 422         return_ACPI_STATUS(status);
 423 }
 424
 425 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)