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 - 2017, 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 "accommon.h"
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49 ACPI_MODULE_NAME("hwsleep")
  50
  51 #if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_hw_legacy_sleep
  55  *
  56  * PARAMETERS:  sleep_state         - Which sleep state to enter
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers
  61  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
  62  *
  63  ******************************************************************************/
  64 acpi_status acpi_hw_legacy_sleep(u8 sleep_state)
  65 {
  66         struct acpi_bit_register_info *sleep_type_reg_info;
  67         struct acpi_bit_register_info *sleep_enable_reg_info;
  68         u32 pm1a_control;
  69         u32 pm1b_control;
  70         u32 in_value;
  71         acpi_status status;
  72
  73         ACPI_FUNCTION_TRACE(hw_legacy_sleep);
  74
  75         sleep_type_reg_info =
  76             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
  77         sleep_enable_reg_info =
  78             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
  79
  80         /* Clear wake status */
  81
  82         status = acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS,
  83                                          ACPI_CLEAR_STATUS);
  84         if (ACPI_FAILURE(status)) {
  85                 return_ACPI_STATUS(status);
  86         }
  87
  88         /* Clear all fixed and general purpose status bits */
  89
  90         status = acpi_hw_clear_acpi_status();
  91         if (ACPI_FAILURE(status)) {
  92                 return_ACPI_STATUS(status);
  93         }
  94
  95         /*
  96          * 1) Disable/Clear all GPEs
  97          * 2) Enable all wakeup GPEs
  98          */
  99         status = acpi_hw_disable_all_gpes();
 100         if (ACPI_FAILURE(status)) {
 101                 return_ACPI_STATUS(status);
 102         }
 103         acpi_gbl_system_awake_and_running = FALSE;
 104
 105         status = acpi_hw_enable_all_wakeup_gpes();
 106         if (ACPI_FAILURE(status)) {
 107                 return_ACPI_STATUS(status);
 108         }
 109
 110         /* Get current value of PM1A control */
 111
 112         status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
 113                                        &pm1a_control);
 114         if (ACPI_FAILURE(status)) {
 115                 return_ACPI_STATUS(status);
 116         }
 117         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 118                           "Entering sleep state [S%u]\n", sleep_state));
 119
 120         /* Clear the SLP_EN and SLP_TYP fields */
 121
 122         pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
 123                           sleep_enable_reg_info->access_bit_mask);
 124         pm1b_control = pm1a_control;
 125
 126         /* Insert the SLP_TYP bits */
 127
 128         pm1a_control |=
 129             (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 130         pm1b_control |=
 131             (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 132
 133         /*
 134          * We split the writes of SLP_TYP and SLP_EN to workaround
 135          * poorly implemented hardware.
 136          */
 137
 138         /* Write #1: write the SLP_TYP data to the PM1 Control registers */
 139
 140         status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
 141         if (ACPI_FAILURE(status)) {
 142                 return_ACPI_STATUS(status);
 143         }
 144
 145         /* Insert the sleep enable (SLP_EN) bit */
 146
 147         pm1a_control |= sleep_enable_reg_info->access_bit_mask;
 148         pm1b_control |= sleep_enable_reg_info->access_bit_mask;
 149
 150         /* Flush caches, as per ACPI specification */
 151
 152         ACPI_FLUSH_CPU_CACHE();
 153
 154         status = acpi_os_enter_sleep(sleep_state, pm1a_control, pm1b_control);
 155         if (status == AE_CTRL_TERMINATE) {
 156                 return_ACPI_STATUS(AE_OK);
 157         }
 158         if (ACPI_FAILURE(status)) {
 159                 return_ACPI_STATUS(status);
 160         }
 161
 162         /* Write #2: Write both SLP_TYP + SLP_EN */
 163
 164         status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
 165         if (ACPI_FAILURE(status)) {
 166                 return_ACPI_STATUS(status);
 167         }
 168
 169         if (sleep_state > ACPI_STATE_S3) {
 170                 /*
 171                  * We wanted to sleep > S3, but it didn't happen (by virtue of the
 172                  * fact that we are still executing!)
 173                  *
 174                  * Wait ten seconds, then try again. This is to get S4/S5 to work on
 175                  * all machines.
 176                  *
 177                  * We wait so long to allow chipsets that poll this reg very slowly
 178                  * to still read the right value. Ideally, this block would go
 179                  * away entirely.
 180                  */
 181                 acpi_os_stall(10 * ACPI_USEC_PER_SEC);
 182
 183                 status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
 184                                                 sleep_enable_reg_info->
 185                                                 access_bit_mask);
 186                 if (ACPI_FAILURE(status)) {
 187                         return_ACPI_STATUS(status);
 188                 }
 189         }
 190
 191         /* Wait for transition back to Working State */
 192
 193         do {
 194                 status =
 195                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
 196                 if (ACPI_FAILURE(status)) {
 197                         return_ACPI_STATUS(status);
 198                 }
 199
 200         } while (!in_value);
 201
 202         return_ACPI_STATUS(AE_OK);
 203 }
 204
 205 /*******************************************************************************
 206  *
 207  * FUNCTION:    acpi_hw_legacy_wake_prep
 208  *
 209  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 210  *
 211  * RETURN:      Status
 212  *
 213  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 214  *              sleep.
 215  *              Called with interrupts ENABLED.
 216  *
 217  ******************************************************************************/
 218
 219 acpi_status acpi_hw_legacy_wake_prep(u8 sleep_state)
 220 {
 221         acpi_status status = AE_OK;
 222         struct acpi_bit_register_info *sleep_type_reg_info;
 223         struct acpi_bit_register_info *sleep_enable_reg_info;
 224         u32 pm1a_control;
 225         u32 pm1b_control;
 226
 227         ACPI_FUNCTION_TRACE(hw_legacy_wake_prep);
 228
 229         /*
 230          * Set SLP_TYPE and SLP_EN to state S0.
 231          * This is unclear from the ACPI Spec, but it is required
 232          * by some machines.
 233          */
 234         if (acpi_gbl_sleep_type_a_s0 != ACPI_SLEEP_TYPE_INVALID) {
 235                 sleep_type_reg_info =
 236                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
 237                 sleep_enable_reg_info =
 238                     acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
 239
 240                 /* Get current value of PM1A control */
 241
 242                 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
 243                                                &pm1a_control);
 244                 if (ACPI_SUCCESS(status)) {
 245
 246                         /* Clear the SLP_EN and SLP_TYP fields */
 247
 248                         pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
 249                                           sleep_enable_reg_info->
 250                                           access_bit_mask);
 251                         pm1b_control = pm1a_control;
 252
 253                         /* Insert the SLP_TYP bits */
 254
 255                         pm1a_control |= (acpi_gbl_sleep_type_a_s0 <<
 256                                          sleep_type_reg_info->bit_position);
 257                         pm1b_control |= (acpi_gbl_sleep_type_b_s0 <<
 258                                          sleep_type_reg_info->bit_position);
 259
 260                         /* Write the control registers and ignore any errors */
 261
 262                         (void)acpi_hw_write_pm1_control(pm1a_control,
 263                                                         pm1b_control);
 264                 }
 265         }
 266
 267         return_ACPI_STATUS(status);
 268 }
 269
 270 /*******************************************************************************
 271  *
 272  * FUNCTION:    acpi_hw_legacy_wake
 273  *
 274  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 275  *
 276  * RETURN:      Status
 277  *
 278  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 279  *              Called with interrupts ENABLED.
 280  *
 281  ******************************************************************************/
 282
 283 acpi_status acpi_hw_legacy_wake(u8 sleep_state)
 284 {
 285         acpi_status status;
 286
 287         ACPI_FUNCTION_TRACE(hw_legacy_wake);
 288
 289         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 290
 291         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 292         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING);
 293
 294         /*
 295          * GPEs must be enabled before _WAK is called as GPEs
 296          * might get fired there
 297          *
 298          * Restore the GPEs:
 299          * 1) Disable/Clear all GPEs
 300          * 2) Enable all runtime GPEs
 301          */
 302         status = acpi_hw_disable_all_gpes();
 303         if (ACPI_FAILURE(status)) {
 304                 return_ACPI_STATUS(status);
 305         }
 306
 307         status = acpi_hw_enable_all_runtime_gpes();
 308         if (ACPI_FAILURE(status)) {
 309                 return_ACPI_STATUS(status);
 310         }
 311
 312         /*
 313          * Now we can execute _WAK, etc. Some machines require that the GPEs
 314          * are enabled before the wake methods are executed.
 315          */
 316         acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state);
 317
 318         /*
 319          * Some BIOS code assumes that WAK_STS will be cleared on resume
 320          * and use it to determine whether the system is rebooting or
 321          * resuming. Clear WAK_STS for compatibility.
 322          */
 323         (void)acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS,
 324                                       ACPI_CLEAR_STATUS);
 325         acpi_gbl_system_awake_and_running = TRUE;
 326
 327         /* Enable power button */
 328
 329         (void)
 330             acpi_write_bit_register(acpi_gbl_fixed_event_info
 331                                     [ACPI_EVENT_POWER_BUTTON].
 332                                     enable_register_id, ACPI_ENABLE_EVENT);
 333
 334         (void)
 335             acpi_write_bit_register(acpi_gbl_fixed_event_info
 336                                     [ACPI_EVENT_POWER_BUTTON].
 337                                     status_register_id, ACPI_CLEAR_STATUS);
 338
 339         acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
 340         return_ACPI_STATUS(status);
 341 }
 342
 343 #endif                          /* !ACPI_REDUCED_HARDWARE */