NetBSD-5.0.2/sys/dist/acpica/evgpe.c
/******************************************************************************
*
* Module Name: evgpe - General Purpose Event handling and dispatch
* $Revision: 1.5 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#include "acpi.h"
#include "acevents.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME ("evgpe")
/* Local prototypes */
static void ACPI_SYSTEM_XFACE
AcpiEvAsynchExecuteGpeMethod (
void *Context);
static void ACPI_SYSTEM_XFACE
AcpiEvAsynchEnableGpe (
void *Context);
/*******************************************************************************
*
* FUNCTION: AcpiEvSetGpeType
*
* PARAMETERS: GpeEventInfo - GPE to set
* Type - New type
*
* RETURN: Status
*
* DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
*
******************************************************************************/
ACPI_STATUS
AcpiEvSetGpeType (
ACPI_GPE_EVENT_INFO *GpeEventInfo,
UINT8 Type)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (EvSetGpeType);
/* Validate type and update register enable masks */
switch (Type)
{
case ACPI_GPE_TYPE_WAKE:
case ACPI_GPE_TYPE_RUNTIME:
case ACPI_GPE_TYPE_WAKE_RUN:
break;
default:
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Disable the GPE if currently enabled */
Status = AcpiEvDisableGpe (GpeEventInfo);
/* Type was validated above */
GpeEventInfo->Flags &= ~ACPI_GPE_TYPE_MASK; /* Clear type bits */
GpeEventInfo->Flags |= Type; /* Insert type */
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiEvUpdateGpeEnableMasks
*
* PARAMETERS: GpeEventInfo - GPE to update
* Type - What to do: ACPI_GPE_DISABLE or
* ACPI_GPE_ENABLE
*
* RETURN: Status
*
* DESCRIPTION: Updates GPE register enable masks based on the GPE type
*
******************************************************************************/
ACPI_STATUS
AcpiEvUpdateGpeEnableMasks (
ACPI_GPE_EVENT_INFO *GpeEventInfo,
UINT8 Type)
{
ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
UINT8 RegisterBit;
ACPI_FUNCTION_TRACE (EvUpdateGpeEnableMasks);
GpeRegisterInfo = GpeEventInfo->RegisterInfo;
if (!GpeRegisterInfo)
{
return_ACPI_STATUS (AE_NOT_EXIST);
}
RegisterBit = (UINT8)
(1 << (GpeEventInfo->GpeNumber - GpeRegisterInfo->BaseGpeNumber));
/* 1) Disable case. Simply clear all enable bits */
if (Type == ACPI_GPE_DISABLE)
{
ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForWake, RegisterBit);
ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
return_ACPI_STATUS (AE_OK);
}
/* 2) Enable case. Set/Clear the appropriate enable bits */
switch (GpeEventInfo->Flags & ACPI_GPE_TYPE_MASK)
{
case ACPI_GPE_TYPE_WAKE:
ACPI_SET_BIT (GpeRegisterInfo->EnableForWake, RegisterBit);
ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
break;
case ACPI_GPE_TYPE_RUNTIME:
ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForWake, RegisterBit);
ACPI_SET_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
break;
case ACPI_GPE_TYPE_WAKE_RUN:
ACPI_SET_BIT (GpeRegisterInfo->EnableForWake, RegisterBit);
ACPI_SET_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
break;
default:
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiEvEnableGpe
*
* PARAMETERS: GpeEventInfo - GPE to enable
* WriteToHardware - Enable now, or just mark data structs
* (WAKE GPEs should be deferred)
*
* RETURN: Status
*
* DESCRIPTION: Enable a GPE based on the GPE type
*
******************************************************************************/
ACPI_STATUS
AcpiEvEnableGpe (
ACPI_GPE_EVENT_INFO *GpeEventInfo,
BOOLEAN WriteToHardware)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (EvEnableGpe);
/* Make sure HW enable masks are updated */
Status = AcpiEvUpdateGpeEnableMasks (GpeEventInfo, ACPI_GPE_ENABLE);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Mark wake-enabled or HW enable, or both */
switch (GpeEventInfo->Flags & ACPI_GPE_TYPE_MASK)
{
case ACPI_GPE_TYPE_WAKE:
ACPI_SET_BIT (GpeEventInfo->Flags, ACPI_GPE_WAKE_ENABLED);
break;
case ACPI_GPE_TYPE_WAKE_RUN:
ACPI_SET_BIT (GpeEventInfo->Flags, ACPI_GPE_WAKE_ENABLED);
/*lint -fallthrough */
case ACPI_GPE_TYPE_RUNTIME:
ACPI_SET_BIT (GpeEventInfo->Flags, ACPI_GPE_RUN_ENABLED);
if (WriteToHardware)
{
/* Clear the GPE (of stale events), then enable it */
Status = AcpiHwClearGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Enable the requested runtime GPE */
Status = AcpiHwWriteGpeEnableReg (GpeEventInfo);
}
break;
default:
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiEvDisableGpe
*
* PARAMETERS: GpeEventInfo - GPE to disable
*
* RETURN: Status
*
* DESCRIPTION: Disable a GPE based on the GPE type
*
******************************************************************************/
ACPI_STATUS
AcpiEvDisableGpe (
ACPI_GPE_EVENT_INFO *GpeEventInfo)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (EvDisableGpe);
/*
* Ignore this if the GPE is valid and not enabled.
*
* Flags is only zero if GPE is neither enabled or disabled -- it may
* be a spurious or stray GPE -- disable it in the default case below.
*/
if (GpeEventInfo->Flags &&
(!(GpeEventInfo->Flags & ACPI_GPE_ENABLE_MASK)))
{
return_ACPI_STATUS (AE_OK);
}
/* Make sure HW enable masks are updated */
Status = AcpiEvUpdateGpeEnableMasks (GpeEventInfo, ACPI_GPE_DISABLE);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Mark wake-disabled or HW disable, or both */
switch (GpeEventInfo->Flags & ACPI_GPE_TYPE_MASK)
{
case ACPI_GPE_TYPE_WAKE:
ACPI_CLEAR_BIT (GpeEventInfo->Flags, ACPI_GPE_WAKE_ENABLED);
break;
case ACPI_GPE_TYPE_WAKE_RUN:
ACPI_CLEAR_BIT (GpeEventInfo->Flags, ACPI_GPE_WAKE_ENABLED);
/*lint -fallthrough */
case ACPI_GPE_TYPE_RUNTIME:
/* Disable the requested runtime GPE */
ACPI_CLEAR_BIT (GpeEventInfo->Flags, ACPI_GPE_RUN_ENABLED);
/*lint -fallthrough */
default:
/*
* Even if we don't know the GPE type, make sure that we always
* disable it. This can prevent a certain type of GPE flood, where
* the GPE has no _Lxx/_Exx method, and it cannot be determined
* whether the GPE is wake, run, or wake/run.
*/
Status = AcpiHwWriteGpeEnableReg (GpeEventInfo);
break;
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiEvGetGpeEventInfo
*
* PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
* GpeNumber - Raw GPE number
*
* RETURN: A GPE EventInfo struct. NULL if not a valid GPE
*
* DESCRIPTION: Returns the EventInfo struct associated with this GPE.
* Validates the GpeBlock and the GpeNumber
*
* Should be called only when the GPE lists are semaphore locked
* and not subject to change.
*
******************************************************************************/
ACPI_GPE_EVENT_INFO *
AcpiEvGetGpeEventInfo (
ACPI_HANDLE GpeDevice,
UINT32 GpeNumber)
{
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_GPE_BLOCK_INFO *GpeBlock;
ACPI_NATIVE_UINT i;
ACPI_FUNCTION_ENTRY ();
/* A NULL GpeBlock means use the FADT-defined GPE block(s) */
if (!GpeDevice)
{
/* Examine GPE Block 0 and 1 (These blocks are permanent) */
for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++)
{
GpeBlock = AcpiGbl_GpeFadtBlocks[i];
if (GpeBlock)
{
if ((GpeNumber >= GpeBlock->BlockBaseNumber) &&
(GpeNumber < GpeBlock->BlockBaseNumber +
(GpeBlock->RegisterCount * 8)))
{
return (&GpeBlock->EventInfo[GpeNumber -
GpeBlock->BlockBaseNumber]);
}
}
}
/* The GpeNumber was not in the range of either FADT GPE block */
return (NULL);
}
/* A Non-NULL GpeDevice means this is a GPE Block Device */
ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) GpeDevice);
if (!ObjDesc ||
!ObjDesc->Device.GpeBlock)
{
return (NULL);
}
GpeBlock = ObjDesc->Device.GpeBlock;
if ((GpeNumber >= GpeBlock->BlockBaseNumber) &&
(GpeNumber < GpeBlock->BlockBaseNumber + (GpeBlock->RegisterCount * 8)))
{
return (&GpeBlock->EventInfo[GpeNumber - GpeBlock->BlockBaseNumber]);
}
return (NULL);
}
/*******************************************************************************
*
* FUNCTION: AcpiEvGpeDetect
*
* PARAMETERS: GpeXruptList - Interrupt block for this interrupt.
* Can have multiple GPE blocks attached.
*
* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
*
* DESCRIPTION: Detect if any GP events have occurred. This function is
* executed at interrupt level.
*
******************************************************************************/
UINT32
AcpiEvGpeDetect (
ACPI_GPE_XRUPT_INFO *GpeXruptList)
{
ACPI_STATUS Status;
ACPI_GPE_BLOCK_INFO *GpeBlock;
ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
UINT8 EnabledStatusByte;
UINT32 StatusReg;
UINT32 EnableReg;
ACPI_CPU_FLAGS Flags;
ACPI_NATIVE_UINT i;
ACPI_NATIVE_UINT j;
ACPI_FUNCTION_NAME (EvGpeDetect);
/* Check for the case where there are no GPEs */
if (!GpeXruptList)
{
return (IntStatus);
}
/*
* We need to obtain the GPE lock for both the data structs and registers
* Note: Not necessary to obtain the hardware lock, since the GPE registers
* are owned by the GpeLock.
*/
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
/* Examine all GPE blocks attached to this interrupt level */
GpeBlock = GpeXruptList->GpeBlockListHead;
while (GpeBlock)
{
/*
* Read all of the 8-bit GPE status and enable registers
* in this GPE block, saving all of them.
* Find all currently active GP events.
*/
for (i = 0; i < GpeBlock->RegisterCount; i++)
{
/* Get the next status/enable pair */
GpeRegisterInfo = &GpeBlock->RegisterInfo[i];
/* Read the Status Register */
Status = AcpiHwLowLevelRead (ACPI_GPE_REGISTER_WIDTH, &StatusReg,
&GpeRegisterInfo->StatusAddress);
if (ACPI_FAILURE (Status))
{
goto UnlockAndExit;
}
/* Read the Enable Register */
Status = AcpiHwLowLevelRead (ACPI_GPE_REGISTER_WIDTH, &EnableReg,
&GpeRegisterInfo->EnableAddress);
if (ACPI_FAILURE (Status))
{
goto UnlockAndExit;
}
ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
"Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
GpeRegisterInfo->BaseGpeNumber, StatusReg, EnableReg));
/* Check if there is anything active at all in this register */
EnabledStatusByte = (UINT8) (StatusReg & EnableReg);
if (!EnabledStatusByte)
{
/* No active GPEs in this register, move on */
continue;
}
/* Now look at the individual GPEs in this byte register */
for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
{
/* Examine one GPE bit */
if (EnabledStatusByte & (1 << j))
{
/*
* Found an active GPE. Dispatch the event to a handler
* or method.
*/
IntStatus |= AcpiEvGpeDispatch (
&GpeBlock->EventInfo[(i * ACPI_GPE_REGISTER_WIDTH) + j],
(UINT32) j + GpeRegisterInfo->BaseGpeNumber);
}
}
}
GpeBlock = GpeBlock->Next;
}
UnlockAndExit:
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
return (IntStatus);
}
/*******************************************************************************
*
* FUNCTION: AcpiEvAsynchExecuteGpeMethod
*
* PARAMETERS: Context (GpeEventInfo) - Info for this GPE
*
* RETURN: None
*
* DESCRIPTION: Perform the actual execution of a GPE control method. This
* function is called from an invocation of AcpiOsExecute and
* therefore does NOT execute at interrupt level - so that
* the control method itself is not executed in the context of
* an interrupt handler.
*
******************************************************************************/
static void ACPI_SYSTEM_XFACE
AcpiEvAsynchExecuteGpeMethod (
void *Context)
{
ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
ACPI_STATUS Status;
ACPI_GPE_EVENT_INFO *LocalGpeEventInfo;
ACPI_EVALUATE_INFO *Info;
ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod);
/* Allocate a local GPE block */
LocalGpeEventInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_EVENT_INFO));
if (!LocalGpeEventInfo)
{
ACPI_EXCEPTION ((AE_INFO, AE_NO_MEMORY,
"while handling a GPE"));
return_VOID;
}
Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
if (ACPI_FAILURE (Status))
{
return_VOID;
}
/* Must revalidate the GpeNumber/GpeBlock */
if (!AcpiEvValidGpeEvent (GpeEventInfo))
{
Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
return_VOID;
}
/* Set the GPE flags for return to enabled state */
(void) AcpiEvEnableGpe (GpeEventInfo, FALSE);
/*
* Take a snapshot of the GPE info for this level - we copy the
* info to prevent a race condition with RemoveHandler/RemoveBlock.
*/
ACPI_MEMCPY (LocalGpeEventInfo, GpeEventInfo,
sizeof (ACPI_GPE_EVENT_INFO));
Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
if (ACPI_FAILURE (Status))
{
return_VOID;
}
/*
* Must check for control method type dispatch one more
* time to avoid race with EvGpeInstallHandler
*/
if ((LocalGpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
ACPI_GPE_DISPATCH_METHOD)
{
/* Allocate the evaluation information block */
Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
if (!Info)
{
Status = AE_NO_MEMORY;
}
else
{
/*
* Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
* control method that corresponds to this GPE
*/
Info->PrefixNode = LocalGpeEventInfo->Dispatch.MethodNode;
Info->Parameters = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT *, LocalGpeEventInfo);
Info->ParameterType = ACPI_PARAM_GPE;
Info->Flags = ACPI_IGNORE_RETURN_VALUE;
Status = AcpiNsEvaluate (Info);
ACPI_FREE (Info);
}
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"while evaluating GPE method [%4.4s]",
AcpiUtGetNodeName (LocalGpeEventInfo->Dispatch.MethodNode)));
}
}
/* Defer enabling of GPE until all notify handlers are done */
Status = AcpiOsExecute (OSL_NOTIFY_HANDLER,
AcpiEvAsynchEnableGpe, LocalGpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_FREE (LocalGpeEventInfo);
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiEvAsynchEnableGpe
*
* PARAMETERS: Context (GpeEventInfo) - Info for this GPE
*
* RETURN: None
*
* DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
* complete (i.e., finish execution of Notify)
*
******************************************************************************/
static void ACPI_SYSTEM_XFACE
AcpiEvAsynchEnableGpe (
void *Context)
{
ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
ACPI_STATUS Status;
if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
ACPI_GPE_LEVEL_TRIGGERED)
{
/*
* GPE is level-triggered, we clear the GPE status bit after
* handling the event.
*/
Status = AcpiHwClearGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
goto Exit;
}
}
/* Enable this GPE */
(void) AcpiHwWriteGpeEnableReg (GpeEventInfo);
Exit:
ACPI_FREE (GpeEventInfo);
return;
}
/*******************************************************************************
*
* FUNCTION: AcpiEvGpeDispatch
*
* PARAMETERS: GpeEventInfo - Info for this GPE
* GpeNumber - Number relative to the parent GPE block
*
* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
*
* DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
* or method (e.g. _Lxx/_Exx) handler.
*
* This function executes at interrupt level.
*
******************************************************************************/
UINT32
AcpiEvGpeDispatch (
ACPI_GPE_EVENT_INFO *GpeEventInfo,
UINT32 GpeNumber)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (EvGpeDispatch);
AcpiGpeCount++;
/*
* If edge-triggered, clear the GPE status bit now. Note that
* level-triggered events are cleared after the GPE is serviced.
*/
if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
ACPI_GPE_EDGE_TRIGGERED)
{
Status = AcpiHwClearGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Unable to clear GPE[%2X]", GpeNumber));
return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
}
}
if (!AcpiGbl_SystemAwakeAndRunning)
{
/*
* We just woke up because of a wake GPE. Disable any further GPEs
* until we are fully up and running (Only wake GPEs should be enabled
* at this time, but we just brute-force disable them all.)
* 1) We must disable this particular wake GPE so it won't fire again
* 2) We want to disable all wake GPEs, since we are now awake
*/
(void) AcpiHwDisableAllGpes ();
}
/*
* Dispatch the GPE to either an installed handler, or the control method
* associated with this GPE (_Lxx or _Exx). If a handler exists, we invoke
* it and do not attempt to run the method. If there is neither a handler
* nor a method, we disable this GPE to prevent further such pointless
* events from firing.
*/
switch (GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK)
{
case ACPI_GPE_DISPATCH_HANDLER:
/*
* Invoke the installed handler (at interrupt level)
* Ignore return status for now. TBD: leave GPE disabled on error?
*/
(void) GpeEventInfo->Dispatch.Handler->Address (
GpeEventInfo->Dispatch.Handler->Context);
/* It is now safe to clear level-triggered events. */
if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
ACPI_GPE_LEVEL_TRIGGERED)
{
Status = AcpiHwClearGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Unable to clear GPE[%2X]", GpeNumber));
return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
}
}
break;
case ACPI_GPE_DISPATCH_METHOD:
/*
* Disable the GPE, so it doesn't keep firing before the method has a
* chance to run (it runs asynchronously with interrupts enabled).
*/
Status = AcpiEvDisableGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Unable to disable GPE[%2X]", GpeNumber));
return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
}
/*
* Execute the method associated with the GPE
* NOTE: Level-triggered GPEs are cleared after the method completes.
*/
Status = AcpiOsExecute (OSL_GPE_HANDLER,
AcpiEvAsynchExecuteGpeMethod, GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Unable to queue handler for GPE[%2X] - event disabled",
GpeNumber));
}
break;
default:
/* No handler or method to run! */
ACPI_ERROR ((AE_INFO,
"No handler or method for GPE[%2X], disabling event",
GpeNumber));
/*
* Disable the GPE. The GPE will remain disabled until the ACPI
* Core Subsystem is restarted, or a handler is installed.
*/
Status = AcpiEvDisableGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Unable to disable GPE[%2X]", GpeNumber));
return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
}
break;
}
return_UINT32 (ACPI_INTERRUPT_HANDLED);
}