ACPI_STATUS
AcpiEnterSleepStatePrep (
UINT8 SleepState)
{
ACPI_STATUS Status;
ACPI_OBJECT_LIST ArgList;
ACPI_OBJECT Arg;
UINT32 SstValue;
ACPI_FUNCTION_TRACE (AcpiEnterSleepStatePrep);
Status = AcpiGetSleepTypeData (SleepState,
&AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Execute the _PTS method (Prepare To Sleep) */
ArgList.Count = 1;
ArgList.Pointer = &Arg;
Arg.Type = ACPI_TYPE_INTEGER;
Arg.Integer.Value = SleepState;
Status = AcpiEvaluateObject (NULL, METHOD_PATHNAME__PTS, &ArgList, NULL);
if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
{
return_ACPI_STATUS (Status);
}
/* Setup the argument to the _SST method (System STatus) */
switch (SleepState)
{
case ACPI_STATE_S0:
SstValue = ACPI_SST_WORKING;
break;
case ACPI_STATE_S1:
case ACPI_STATE_S2:
case ACPI_STATE_S3:
SstValue = ACPI_SST_SLEEPING;
break;
case ACPI_STATE_S4:
SstValue = ACPI_SST_SLEEP_CONTEXT;
break;
default:
SstValue = ACPI_SST_INDICATOR_OFF; /* Default is off */
break;
}
/*
* Set the system indicators to show the desired sleep state.
* _SST is an optional method (return no error if not found)
*/
AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, SstValue);
return_ACPI_STATUS (AE_OK);
}
ACPI_STATUS
AcpiHwLegacyWake (
UINT8 SleepState)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (HwLegacyWake);
/* Ensure EnterSleepStatePrep -> EnterSleepState ordering */
AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID;
AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING);
/*
* GPEs must be enabled before _WAK is called as GPEs
* might get fired there
*
* Restore the GPEs:
* 1) Disable/Clear all GPEs
* 2) Enable all runtime GPEs
*/
Status = AcpiHwDisableAllGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Status = AcpiHwEnableAllRuntimeGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/*
* Now we can execute _WAK, etc. Some machines require that the GPEs
* are enabled before the wake methods are executed.
*/
AcpiHwExecuteSleepMethod (METHOD_PATHNAME__WAK, SleepState);
/*
* Some BIOS code assumes that WAK_STS will be cleared on resume
* and use it to determine whether the system is rebooting or
* resuming. Clear WAK_STS for compatibility.
*/
(void) AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
AcpiGbl_SystemAwakeAndRunning = TRUE;
/* Enable power button */
(void) AcpiWriteBitRegister(
AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].EnableRegisterId,
ACPI_ENABLE_EVENT);
(void) AcpiWriteBitRegister(
AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].StatusRegisterId,
ACPI_CLEAR_STATUS);
AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING);
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiHwExtendedSleep (
UINT8 SleepState,
UINT8 Flags)
{
ACPI_STATUS Status;
UINT8 SleepTypeValue;
UINT64 SleepStatus;
ACPI_FUNCTION_TRACE (HwExtendedSleep);
/* Extended sleep registers must be valid */
if (!AcpiGbl_FADT.SleepControl.Address ||
!AcpiGbl_FADT.SleepStatus.Address)
{
return_ACPI_STATUS (AE_NOT_EXIST);
}
/* Clear wake status (WAK_STS) */
Status = AcpiWrite (ACPI_X_WAKE_STATUS, &AcpiGbl_FADT.SleepStatus);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
AcpiGbl_SystemAwakeAndRunning = FALSE;
/* Optionally execute _GTS (Going To Sleep) */
if (Flags & ACPI_EXECUTE_GTS)
{
AcpiHwExecuteSleepMethod (METHOD_PATHNAME__GTS, SleepState);
}
/* Flush caches, as per ACPI specification */
ACPI_FLUSH_CPU_CACHE ();
/*
* Set the SLP_TYP and SLP_EN bits.
*
* Note: We only use the first value returned by the \_Sx method
* (AcpiGbl_SleepTypeA) - As per ACPI specification.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
"Entering sleep state [S%u]\n", SleepState));
SleepTypeValue = ((AcpiGbl_SleepTypeA << ACPI_X_SLEEP_TYPE_POSITION) &
ACPI_X_SLEEP_TYPE_MASK);
Status = AcpiWrite ((SleepTypeValue | ACPI_X_SLEEP_ENABLE),
&AcpiGbl_FADT.SleepControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Wait for transition back to Working State */
do
{
Status = AcpiRead (&SleepStatus, &AcpiGbl_FADT.SleepStatus);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
} while (!(((UINT8) SleepStatus) & ACPI_X_WAKE_STATUS));
return_ACPI_STATUS (AE_OK);
}