reactos/drivers/bus/acpi/acpica/hardware/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 - 2016, 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    ("hwsleep")
  50
  51
  52 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    AcpiHwLegacySleep
  56  *
  57  * PARAMETERS:  SleepState          - Which sleep state to enter
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers
  62  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
  63  *
  64  ******************************************************************************/
  65
  66 ACPI_STATUS
  67 AcpiHwLegacySleep (
  68     UINT8                   SleepState)
  69 {
  70     ACPI_BIT_REGISTER_INFO  *SleepTypeRegInfo;
  71     ACPI_BIT_REGISTER_INFO  *SleepEnableRegInfo;
  72     UINT32                  Pm1aControl;
  73     UINT32                  Pm1bControl;
  74     UINT32                  InValue;
  75     ACPI_STATUS             Status;
  76
  77
  78     ACPI_FUNCTION_TRACE (HwLegacySleep);
  79
  80
  81     SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE);
  82     SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE);
  83
  84     /* Clear wake status */
  85
  86     Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS,
  87         ACPI_CLEAR_STATUS);
  88     if (ACPI_FAILURE (Status))
  89     {
  90         return_ACPI_STATUS (Status);
  91     }
  92
  93     /* Clear all fixed and general purpose status bits */
  94
  95     Status = AcpiHwClearAcpiStatus ();
  96     if (ACPI_FAILURE (Status))
  97     {
  98         return_ACPI_STATUS (Status);
  99     }
 100
 101     /*
 102      * 1) Disable/Clear all GPEs
 103      * 2) Enable all wakeup GPEs
 104      */
 105     Status = AcpiHwDisableAllGpes ();
 106     if (ACPI_FAILURE (Status))
 107     {
 108         return_ACPI_STATUS (Status);
 109     }
 110     AcpiGbl_SystemAwakeAndRunning = FALSE;
 111
 112     Status = AcpiHwEnableAllWakeupGpes ();
 113     if (ACPI_FAILURE (Status))
 114     {
 115         return_ACPI_STATUS (Status);
 116     }
 117
 118     /* Get current value of PM1A control */
 119
 120     Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL,
 121         &Pm1aControl);
 122     if (ACPI_FAILURE (Status))
 123     {
 124         return_ACPI_STATUS (Status);
 125     }
 126     ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 127         "Entering sleep state [S%u]\n", SleepState));
 128
 129     /* Clear the SLP_EN and SLP_TYP fields */
 130
 131     Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask |
 132          SleepEnableRegInfo->AccessBitMask);
 133     Pm1bControl = Pm1aControl;
 134
 135     /* Insert the SLP_TYP bits */
 136
 137     Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition);
 138     Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition);
 139
 140     /*
 141      * We split the writes of SLP_TYP and SLP_EN to workaround
 142      * poorly implemented hardware.
 143      */
 144
 145     /* Write #1: write the SLP_TYP data to the PM1 Control registers */
 146
 147     Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
 148     if (ACPI_FAILURE (Status))
 149     {
 150         return_ACPI_STATUS (Status);
 151     }
 152
 153     /* Insert the sleep enable (SLP_EN) bit */
 154
 155     Pm1aControl |= SleepEnableRegInfo->AccessBitMask;
 156     Pm1bControl |= SleepEnableRegInfo->AccessBitMask;
 157
 158     /* Flush caches, as per ACPI specification */
 159
 160     ACPI_FLUSH_CPU_CACHE ();
 161
 162     /* Write #2: Write both SLP_TYP + SLP_EN */
 163
 164     Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
 165     if (ACPI_FAILURE (Status))
 166     {
 167         return_ACPI_STATUS (Status);
 168     }
 169
 170     if (SleepState > ACPI_STATE_S3)
 171     {
 172         /*
 173          * We wanted to sleep > S3, but it didn't happen (by virtue of the
 174          * fact that we are still executing!)
 175          *
 176          * Wait ten seconds, then try again. This is to get S4/S5 to work on
 177          * all machines.
 178          *
 179          * We wait so long to allow chipsets that poll this reg very slowly
 180          * to still read the right value. Ideally, this block would go
 181          * away entirely.
 182          */
 183         AcpiOsStall (10 * ACPI_USEC_PER_SEC);
 184
 185         Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_CONTROL,
 186             SleepEnableRegInfo->AccessBitMask);
 187         if (ACPI_FAILURE (Status))
 188         {
 189             return_ACPI_STATUS (Status);
 190         }
 191     }
 192
 193     /* Wait for transition back to Working State */
 194
 195     do
 196     {
 197         Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue);
 198         if (ACPI_FAILURE (Status))
 199         {
 200             return_ACPI_STATUS (Status);
 201         }
 202
 203     } while (!InValue);
 204
 205     return_ACPI_STATUS (AE_OK);
 206 }
 207
 208
 209 /*******************************************************************************
 210  *
 211  * FUNCTION:    AcpiHwLegacyWakePrep
 212  *
 213  * PARAMETERS:  SleepState          - Which sleep state we just exited
 214  *
 215  * RETURN:      Status
 216  *
 217  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 218  *              sleep.
 219  *              Called with interrupts ENABLED.
 220  *
 221  ******************************************************************************/
 222
 223 ACPI_STATUS
 224 AcpiHwLegacyWakePrep (
 225     UINT8                   SleepState)
 226 {
 227     ACPI_STATUS             Status;
 228     ACPI_BIT_REGISTER_INFO  *SleepTypeRegInfo;
 229     ACPI_BIT_REGISTER_INFO  *SleepEnableRegInfo;
 230     UINT32                  Pm1aControl;
 231     UINT32                  Pm1bControl;
 232
 233
 234     ACPI_FUNCTION_TRACE (HwLegacyWakePrep);
 235
 236     /*
 237      * Set SLP_TYPE and SLP_EN to state S0.
 238      * This is unclear from the ACPI Spec, but it is required
 239      * by some machines.
 240      */
 241     Status = AcpiGetSleepTypeData (ACPI_STATE_S0,
 242         &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB);
 243     if (ACPI_SUCCESS (Status))
 244     {
 245         SleepTypeRegInfo =
 246             AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE);
 247         SleepEnableRegInfo =
 248             AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE);
 249
 250         /* Get current value of PM1A control */
 251
 252         Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL,
 253             &Pm1aControl);
 254         if (ACPI_SUCCESS (Status))
 255         {
 256             /* Clear the SLP_EN and SLP_TYP fields */
 257
 258             Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask |
 259                 SleepEnableRegInfo->AccessBitMask);
 260             Pm1bControl = Pm1aControl;
 261
 262             /* Insert the SLP_TYP bits */
 263
 264             Pm1aControl |= (AcpiGbl_SleepTypeA <<
 265                 SleepTypeRegInfo->BitPosition);
 266             Pm1bControl |= (AcpiGbl_SleepTypeB <<
 267                 SleepTypeRegInfo->BitPosition);
 268
 269             /* Write the control registers and ignore any errors */
 270
 271             (void) AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
 272         }
 273     }
 274
 275     return_ACPI_STATUS (Status);
 276 }
 277
 278
 279 /*******************************************************************************
 280  *
 281  * FUNCTION:    AcpiHwLegacyWake
 282  *
 283  * PARAMETERS:  SleepState          - Which sleep state we just exited
 284  *
 285  * RETURN:      Status
 286  *
 287  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 288  *              Called with interrupts ENABLED.
 289  *
 290  ******************************************************************************/
 291
 292 ACPI_STATUS
 293 AcpiHwLegacyWake (
 294     UINT8                   SleepState)
 295 {
 296     ACPI_STATUS             Status;
 297
 298
 299     ACPI_FUNCTION_TRACE (HwLegacyWake);
 300
 301
 302     /* Ensure EnterSleepStatePrep -> EnterSleepState ordering */
 303
 304     AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID;
 305     AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING);
 306
 307     /*
 308      * GPEs must be enabled before _WAK is called as GPEs
 309      * might get fired there
 310      *
 311      * Restore the GPEs:
 312      * 1) Disable/Clear all GPEs
 313      * 2) Enable all runtime GPEs
 314      */
 315     Status = AcpiHwDisableAllGpes ();
 316     if (ACPI_FAILURE (Status))
 317     {
 318         return_ACPI_STATUS (Status);
 319     }
 320
 321     Status = AcpiHwEnableAllRuntimeGpes ();
 322     if (ACPI_FAILURE (Status))
 323     {
 324         return_ACPI_STATUS (Status);
 325     }
 326
 327     /*
 328      * Now we can execute _WAK, etc. Some machines require that the GPEs
 329      * are enabled before the wake methods are executed.
 330      */
 331     AcpiHwExecuteSleepMethod (METHOD_PATHNAME__WAK, SleepState);
 332
 333     /*
 334      * Some BIOS code assumes that WAK_STS will be cleared on resume
 335      * and use it to determine whether the system is rebooting or
 336      * resuming. Clear WAK_STS for compatibility.
 337      */
 338     (void) AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS,
 339         ACPI_CLEAR_STATUS);
 340     AcpiGbl_SystemAwakeAndRunning = TRUE;
 341
 342     /* Enable power button */
 343
 344     (void) AcpiWriteBitRegister(
 345             AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].EnableRegisterId,
 346             ACPI_ENABLE_EVENT);
 347
 348     (void) AcpiWriteBitRegister(
 349             AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].StatusRegisterId,
 350             ACPI_CLEAR_STATUS);
 351
 352     AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING);
 353     return_ACPI_STATUS (Status);
 354 }
 355
 356 #endif /* !ACPI_REDUCED_HARDWARE */