arch/all-pc/acpica/source/components/hardware/hwesleep.c

   1 /******************************************************************************
   2  *
   3  * Name: hwesleep.c - ACPI Hardware Sleep/Wake Support functions for the
   4  *                    extended FADT-V5 sleep registers.
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2013, 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.h"
  46 #include "accommon.h"
  47
  48 #define _COMPONENT          ACPI_HARDWARE
  49         ACPI_MODULE_NAME    ("hwesleep")
  50
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    AcpiHwExecuteSleepMethod
  55  *
  56  * PARAMETERS:  MethodPathname      - Pathname of method to execute
  57  *              IntegerArgument     - Argument to pass to the method
  58  *
  59  * RETURN:      None
  60  *
  61  * DESCRIPTION: Execute a sleep/wake related method with one integer argument
  62  *              and no return value.
  63  *
  64  ******************************************************************************/
  65
  66 void
  67 AcpiHwExecuteSleepMethod (
  68     char                    *MethodPathname,
  69     UINT32                  IntegerArgument)
  70 {
  71     ACPI_OBJECT_LIST        ArgList;
  72     ACPI_OBJECT             Arg;
  73     ACPI_STATUS             Status;
  74
  75
  76     ACPI_FUNCTION_TRACE (HwExecuteSleepMethod);
  77
  78
  79     /* One argument, IntegerArgument; No return value expected */
  80
  81     ArgList.Count = 1;
  82     ArgList.Pointer = &Arg;
  83     Arg.Type = ACPI_TYPE_INTEGER;
  84     Arg.Integer.Value = (UINT64) IntegerArgument;
  85
  86     Status = AcpiEvaluateObject (NULL, MethodPathname, &ArgList, NULL);
  87     if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
  88     {
  89         ACPI_EXCEPTION ((AE_INFO, Status, "While executing method %s",
  90             MethodPathname));
  91     }
  92
  93     return_VOID;
  94 }
  95
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    AcpiHwExtendedSleep
 100  *
 101  * PARAMETERS:  SleepState          - Which sleep state to enter
 102  *
 103  * RETURN:      Status
 104  *
 105  * DESCRIPTION: Enter a system sleep state via the extended FADT sleep
 106  *              registers (V5 FADT).
 107  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 108  *
 109  ******************************************************************************/
 110
 111 ACPI_STATUS
 112 AcpiHwExtendedSleep (
 113     UINT8                   SleepState)
 114 {
 115     ACPI_STATUS             Status;
 116     UINT8                   SleepTypeValue;
 117     UINT64                  SleepStatus;
 118
 119
 120     ACPI_FUNCTION_TRACE (HwExtendedSleep);
 121
 122
 123     /* Extended sleep registers must be valid */
 124
 125     if (!AcpiGbl_FADT.SleepControl.Address ||
 126         !AcpiGbl_FADT.SleepStatus.Address)
 127     {
 128         return_ACPI_STATUS (AE_NOT_EXIST);
 129     }
 130
 131     /* Clear wake status (WAK_STS) */
 132
 133     Status = AcpiWrite ((UINT64) ACPI_X_WAKE_STATUS, &AcpiGbl_FADT.SleepStatus);
 134     if (ACPI_FAILURE (Status))
 135     {
 136         return_ACPI_STATUS (Status);
 137     }
 138
 139     AcpiGbl_SystemAwakeAndRunning = FALSE;
 140
 141     /* Flush caches, as per ACPI specification */
 142
 143     ACPI_FLUSH_CPU_CACHE ();
 144
 145     /*
 146      * Set the SLP_TYP and SLP_EN bits.
 147      *
 148      * Note: We only use the first value returned by the \_Sx method
 149      * (AcpiGbl_SleepTypeA) - As per ACPI specification.
 150      */
 151     ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 152         "Entering sleep state [S%u]\n", SleepState));
 153
 154     SleepTypeValue = ((AcpiGbl_SleepTypeA << ACPI_X_SLEEP_TYPE_POSITION) &
 155         ACPI_X_SLEEP_TYPE_MASK);
 156
 157     Status = AcpiWrite ((UINT64) (SleepTypeValue | ACPI_X_SLEEP_ENABLE),
 158         &AcpiGbl_FADT.SleepControl);
 159     if (ACPI_FAILURE (Status))
 160     {
 161         return_ACPI_STATUS (Status);
 162     }
 163
 164     /* Wait for transition back to Working State */
 165
 166     do
 167     {
 168         Status = AcpiRead (&SleepStatus, &AcpiGbl_FADT.SleepStatus);
 169         if (ACPI_FAILURE (Status))
 170         {
 171             return_ACPI_STATUS (Status);
 172         }
 173
 174     } while (!(((UINT8) SleepStatus) & ACPI_X_WAKE_STATUS));
 175
 176     return_ACPI_STATUS (AE_OK);
 177 }
 178
 179
 180 /*******************************************************************************
 181  *
 182  * FUNCTION:    AcpiHwExtendedWakePrep
 183  *
 184  * PARAMETERS:  SleepState          - Which sleep state we just exited
 185  *
 186  * RETURN:      Status
 187  *
 188  * DESCRIPTION: Perform first part of OS-independent ACPI cleanup after
 189  *              a sleep. Called with interrupts ENABLED.
 190  *
 191  ******************************************************************************/
 192
 193 ACPI_STATUS
 194 AcpiHwExtendedWakePrep (
 195     UINT8                   SleepState)
 196 {
 197     ACPI_STATUS             Status;
 198     UINT8                   SleepTypeValue;
 199
 200
 201     ACPI_FUNCTION_TRACE (HwExtendedWakePrep);
 202
 203
 204     Status = AcpiGetSleepTypeData (ACPI_STATE_S0,
 205                     &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB);
 206     if (ACPI_SUCCESS (Status))
 207     {
 208         SleepTypeValue = ((AcpiGbl_SleepTypeA << ACPI_X_SLEEP_TYPE_POSITION) &
 209             ACPI_X_SLEEP_TYPE_MASK);
 210
 211         (void) AcpiWrite ((UINT64) (SleepTypeValue | ACPI_X_SLEEP_ENABLE),
 212             &AcpiGbl_FADT.SleepControl);
 213     }
 214
 215     return_ACPI_STATUS (AE_OK);
 216 }
 217
 218
 219 /*******************************************************************************
 220  *
 221  * FUNCTION:    AcpiHwExtendedWake
 222  *
 223  * PARAMETERS:  SleepState          - Which sleep state we just exited
 224  *
 225  * RETURN:      Status
 226  *
 227  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 228  *              Called with interrupts ENABLED.
 229  *
 230  ******************************************************************************/
 231
 232 ACPI_STATUS
 233 AcpiHwExtendedWake (
 234     UINT8                   SleepState)
 235 {
 236     ACPI_FUNCTION_TRACE (HwExtendedWake);
 237
 238
 239     /* Ensure EnterSleepStatePrep -> EnterSleepState ordering */
 240
 241     AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID;
 242
 243     /* Execute the wake methods */
 244
 245     AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING);
 246     AcpiHwExecuteSleepMethod (METHOD_PATHNAME__WAK, SleepState);
 247
 248     /*
 249      * Some BIOS code assumes that WAK_STS will be cleared on resume
 250      * and use it to determine whether the system is rebooting or
 251      * resuming. Clear WAK_STS for compatibility.
 252      */
 253     (void) AcpiWrite ((UINT64) ACPI_X_WAKE_STATUS, &AcpiGbl_FADT.SleepStatus);
 254     AcpiGbl_SystemAwakeAndRunning = TRUE;
 255
 256     AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING);
 257     return_ACPI_STATUS (AE_OK);
 258 }