drivers/acpi/acpica/hwsleep.c

   1 /******************************************************************************
   2  *
   3  * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the
   4  *                   original/legacy sleep/PM registers.
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2012, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <linux/acpi.h>
  47 #include "accommon.h"
  48 #include <linux/module.h>
  49
  50 #define _COMPONENT          ACPI_HARDWARE
  51 ACPI_MODULE_NAME("hwsleep")
  52
  53 #if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_hw_legacy_sleep
  57  *
  58  * PARAMETERS:  sleep_state         - Which sleep state to enter
  59  *              flags               - ACPI_EXECUTE_GTS to run optional method
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers
  64  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
  65  *
  66  ******************************************************************************/
  67 acpi_status acpi_hw_legacy_sleep(u8 sleep_state, u8 flags)
  68 {
  69         struct acpi_bit_register_info *sleep_type_reg_info;
  70         struct acpi_bit_register_info *sleep_enable_reg_info;
  71         u32 pm1a_control;
  72         u32 pm1b_control;
  73         u32 in_value;
  74         acpi_status status;
  75
  76         ACPI_FUNCTION_TRACE(hw_legacy_sleep);
  77
  78         sleep_type_reg_info =
  79             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
  80         sleep_enable_reg_info =
  81             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
  82
  83         /* Clear wake status */
  84
  85         status =
  86             acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
  87         if (ACPI_FAILURE(status)) {
  88                 return_ACPI_STATUS(status);
  89         }
  90
  91         /* Clear all fixed and general purpose status bits */
  92
  93         status = acpi_hw_clear_acpi_status();
  94         if (ACPI_FAILURE(status)) {
  95                 return_ACPI_STATUS(status);
  96         }
  97
  98         /*
  99          * 1) Disable/Clear all GPEs
 100          * 2) Enable all wakeup GPEs
 101          */
 102         status = acpi_hw_disable_all_gpes();
 103         if (ACPI_FAILURE(status)) {
 104                 return_ACPI_STATUS(status);
 105         }
 106         acpi_gbl_system_awake_and_running = FALSE;
 107
 108         status = acpi_hw_enable_all_wakeup_gpes();
 109         if (ACPI_FAILURE(status)) {
 110                 return_ACPI_STATUS(status);
 111         }
 112
 113         /* Optionally execute _GTS (Going To Sleep) */
 114
 115         if (flags & ACPI_EXECUTE_GTS) {
 116                 acpi_hw_execute_sleep_method(METHOD_PATHNAME__GTS, sleep_state);
 117         }
 118
 119         /* Get current value of PM1A control */
 120
 121         status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
 122                                        &pm1a_control);
 123         if (ACPI_FAILURE(status)) {
 124                 return_ACPI_STATUS(status);
 125         }
 126         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 127                           "Entering sleep state [S%u]\n", sleep_state));
 128
 129         /* Clear the SLP_EN and SLP_TYP fields */
 130
 131         pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
 132                           sleep_enable_reg_info->access_bit_mask);
 133         pm1b_control = pm1a_control;
 134
 135         /* Insert the SLP_TYP bits */
 136
 137         pm1a_control |=
 138             (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 139         pm1b_control |=
 140             (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 141
 142         /*
 143          * We split the writes of SLP_TYP and SLP_EN to workaround
 144          * poorly implemented hardware.
 145          */
 146
 147         /* Write #1: write the SLP_TYP data to the PM1 Control registers */
 148
 149         status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
 150         if (ACPI_FAILURE(status)) {
 151                 return_ACPI_STATUS(status);
 152         }
 153
 154         /* Insert the sleep enable (SLP_EN) bit */
 155
 156         pm1a_control |= sleep_enable_reg_info->access_bit_mask;
 157         pm1b_control |= sleep_enable_reg_info->access_bit_mask;
 158
 159         /* Flush caches, as per ACPI specification */
 160
 161         ACPI_FLUSH_CPU_CACHE();
 162
 163         status = acpi_os_prepare_sleep(sleep_state, pm1a_control,
 164                                        pm1b_control);
 165         if (ACPI_SKIP(status))
 166                 return_ACPI_STATUS(AE_OK);
 167         if (ACPI_FAILURE(status))
 168                 return_ACPI_STATUS(status);
 169         /* Write #2: Write both SLP_TYP + SLP_EN */
 170
 171         status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
 172         if (ACPI_FAILURE(status)) {
 173                 return_ACPI_STATUS(status);
 174         }
 175
 176         if (sleep_state > ACPI_STATE_S3) {
 177                 /*
 178                  * We wanted to sleep > S3, but it didn't happen (by virtue of the
 179                  * fact that we are still executing!)
 180                  *
 181                  * Wait ten seconds, then try again. This is to get S4/S5 to work on
 182                  * all machines.
 183                  *
 184                  * We wait so long to allow chipsets that poll this reg very slowly
 185                  * to still read the right value. Ideally, this block would go
 186                  * away entirely.
 187                  */
 188                 acpi_os_stall(10000000);
 189
 190                 status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
 191                                                 sleep_enable_reg_info->
 192                                                 access_bit_mask);
 193                 if (ACPI_FAILURE(status)) {
 194                         return_ACPI_STATUS(status);
 195                 }
 196         }
 197
 198         /* Wait for transition back to Working State */
 199
 200         do {
 201                 status =
 202                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 203                 if (ACPI_FAILURE(status)) {
 204                         return_ACPI_STATUS(status);
 205                 }
 206
 207         } while (!in_value);
 208
 209         return_ACPI_STATUS(AE_OK);
 210 }
 211
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_hw_legacy_wake_prep
 215  *
 216  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 217  *              flags               - ACPI_EXECUTE_BFS to run optional method
 218  *
 219  * RETURN:      Status
 220  *
 221  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 222  *              sleep.
 223  *              Called with interrupts ENABLED.
 224  *
 225  ******************************************************************************/
 226
 227 acpi_status acpi_hw_legacy_wake_prep(u8 sleep_state, u8 flags)
 228 {
 229         acpi_status status;
 230         struct acpi_bit_register_info *sleep_type_reg_info;
 231         struct acpi_bit_register_info *sleep_enable_reg_info;
 232         u32 pm1a_control;
 233         u32 pm1b_control;
 234
 235         ACPI_FUNCTION_TRACE(hw_legacy_wake_prep);
 236
 237         /*
 238          * Set SLP_TYPE and SLP_EN to state S0.
 239          * This is unclear from the ACPI Spec, but it is required
 240          * by some machines.
 241          */
 242         status = acpi_get_sleep_type_data(ACPI_STATE_S0,
 243                                           &acpi_gbl_sleep_type_a,
 244                                           &acpi_gbl_sleep_type_b);
 245         if (ACPI_SUCCESS(status)) {
 246                 sleep_type_reg_info =
 247                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
 248                 sleep_enable_reg_info =
 249                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 250
 251                 /* Get current value of PM1A control */
 252
 253                 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
 254                                                &pm1a_control);
 255                 if (ACPI_SUCCESS(status)) {
 256
 257                         /* Clear the SLP_EN and SLP_TYP fields */
 258
 259                         pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
 260                                           sleep_enable_reg_info->
 261                                           access_bit_mask);
 262                         pm1b_control = pm1a_control;
 263
 264                         /* Insert the SLP_TYP bits */
 265
 266                         pm1a_control |= (acpi_gbl_sleep_type_a <<
 267                                          sleep_type_reg_info->bit_position);
 268                         pm1b_control |= (acpi_gbl_sleep_type_b <<
 269                                          sleep_type_reg_info->bit_position);
 270
 271                         /* Write the control registers and ignore any errors */
 272
 273                         (void)acpi_hw_write_pm1_control(pm1a_control,
 274                                                         pm1b_control);
 275                 }
 276         }
 277
 278         /* Optionally execute _BFS (Back From Sleep) */
 279
 280         if (flags & ACPI_EXECUTE_BFS) {
 281                 acpi_hw_execute_sleep_method(METHOD_PATHNAME__BFS, sleep_state);
 282         }
 283         return_ACPI_STATUS(status);
 284 }
 285
 286 /*******************************************************************************
 287  *
 288  * FUNCTION:    acpi_hw_legacy_wake
 289  *
 290  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 291  *              flags               - Reserved, set to zero
 292  *
 293  * RETURN:      Status
 294  *
 295  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 296  *              Called with interrupts ENABLED.
 297  *
 298  ******************************************************************************/
 299
 300 acpi_status acpi_hw_legacy_wake(u8 sleep_state, u8 flags)
 301 {
 302         acpi_status status;
 303
 304         ACPI_FUNCTION_TRACE(hw_legacy_wake);
 305
 306         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 307
 308         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 309         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING);
 310
 311         /*
 312          * GPEs must be enabled before _WAK is called as GPEs
 313          * might get fired there
 314          *
 315          * Restore the GPEs:
 316          * 1) Disable/Clear all GPEs
 317          * 2) Enable all runtime GPEs
 318          */
 319         status = acpi_hw_disable_all_gpes();
 320         if (ACPI_FAILURE(status)) {
 321                 return_ACPI_STATUS(status);
 322         }
 323
 324         status = acpi_hw_enable_all_runtime_gpes();
 325         if (ACPI_FAILURE(status)) {
 326                 return_ACPI_STATUS(status);
 327         }
 328
 329         /*
 330          * Now we can execute _WAK, etc. Some machines require that the GPEs
 331          * are enabled before the wake methods are executed.
 332          */
 333         acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state);
 334
 335         /*
 336          * Some BIOS code assumes that WAK_STS will be cleared on resume
 337          * and use it to determine whether the system is rebooting or
 338          * resuming. Clear WAK_STS for compatibility.
 339          */
 340         acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, 1);
 341         acpi_gbl_system_awake_and_running = TRUE;
 342
 343         /* Enable power button */
 344
 345         (void)
 346             acpi_write_bit_register(acpi_gbl_fixed_event_info
 347                                     [ACPI_EVENT_POWER_BUTTON].
 348                                     enable_register_id, ACPI_ENABLE_EVENT);
 349
 350         (void)
 351             acpi_write_bit_register(acpi_gbl_fixed_event_info
 352                                     [ACPI_EVENT_POWER_BUTTON].
 353                                     status_register_id, ACPI_CLEAR_STATUS);
 354
 355         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
 356         return_ACPI_STATUS(status);
 357 }
 358
 359 #endif                          /* !ACPI_REDUCED_HARDWARE */