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NetBSD/sys/dev/acpi/acpica/Subsystem/evgpe.c

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/******************************************************************************
*
* Module Name: evgpe - General Purpose Event handling and dispatch
* xRevision: 33 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2004, 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: evgpe.c,v 1.7 2004/02/14 16:57:24 kochi Exp $");
#include "acpi.h"
#include "acevents.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME ("evgpe")
/*******************************************************************************
*
* 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)
{
UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
UINT8 EnabledStatusByte;
ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
UINT32 InValue;
ACPI_STATUS Status;
ACPI_GPE_BLOCK_INFO *GpeBlock;
UINT32 i;
UINT32 j;
ACPI_FUNCTION_NAME ("EvGpeDetect");
/* Examine all GPE blocks attached to this interrupt level */
AcpiOsAcquireLock (AcpiGbl_GpeLock, ACPI_ISR);
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, &InValue,
&GpeRegisterInfo->StatusAddress);
GpeRegisterInfo->Status = (UINT8) InValue;
if (ACPI_FAILURE (Status))
{
goto UnlockAndExit;
}
/* Read the Enable Register */
Status = AcpiHwLowLevelRead (ACPI_GPE_REGISTER_WIDTH, &InValue,
&GpeRegisterInfo->EnableAddress);
GpeRegisterInfo->Enable = (UINT8) InValue;
if (ACPI_FAILURE (Status))
{
goto UnlockAndExit;
}
ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
"GPE pair: Status %8.8X%8.8X = %02X, Enable %8.8X%8.8X = %02X\n",
ACPI_FORMAT_UINT64 (ACPI_GET_ADDRESS (GpeRegisterInfo->StatusAddress.Address)),
GpeRegisterInfo->Status,
ACPI_FORMAT_UINT64 (ACPI_GET_ADDRESS (GpeRegisterInfo->EnableAddress.Address)),
GpeRegisterInfo->Enable));
/* First check if there is anything active at all in this register */
EnabledStatusByte = (UINT8) (GpeRegisterInfo->Status &
GpeRegisterInfo->Enable);
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 & AcpiGbl_DecodeTo8bit[j])
{
/*
* Found an active GPE. Dispatch the event to a handler
* or method.
*/
IntStatus |= AcpiEvGpeDispatch (
&GpeBlock->EventInfo[(i * ACPI_GPE_REGISTER_WIDTH) + j],
j + GpeRegisterInfo->BaseGpeNumber);
}
}
}
GpeBlock = GpeBlock->Next;
}
UnlockAndExit:
AcpiOsReleaseLock (AcpiGbl_GpeLock, ACPI_ISR);
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 AcpiOsQueueForExecution
* (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 = (void *) Context;
UINT32 GpeNumber = 0;
ACPI_STATUS Status;
ACPI_GPE_EVENT_INFO LocalGpeEventInfo;
ACPI_FUNCTION_TRACE ("EvAsynchExecuteGpeMethod");
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;
}
/*
* 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;
}
if (LocalGpeEventInfo.MethodNode)
{
/*
* Invoke the GPE Method (_Lxx, _Exx):
* (Evaluate the _Lxx/_Exx control method that corresponds to this GPE.)
*/
Status = AcpiNsEvaluateByHandle (LocalGpeEventInfo.MethodNode, NULL, NULL);
if (ACPI_FAILURE (Status))
{
ACPI_REPORT_ERROR (("%s while evaluating method [%4.4s] for GPE[%2X]\n",
AcpiFormatException (Status),
AcpiUtGetNodeName (LocalGpeEventInfo.MethodNode), GpeNumber));
}
}
if (LocalGpeEventInfo.Flags & ACPI_EVENT_LEVEL_TRIGGERED)
{
/*
* GPE is level-triggered, we clear the GPE status bit after handling
* the event.
*/
Status = AcpiHwClearGpe (&LocalGpeEventInfo);
if (ACPI_FAILURE (Status))
{
return_VOID;
}
}
/* Enable this GPE */
(void) AcpiHwEnableGpe (&LocalGpeEventInfo);
return_VOID;
}
/*******************************************************************************
*
* 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");
/*
* 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_EVENT_EDGE_TRIGGERED)
{
Status = AcpiHwClearGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_REPORT_ERROR (("AcpiEvGpeDispatch: Unable to clear GPE[%2X]\n",
GpeNumber));
return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
}
}
/*
* 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 the level to
* prevent further events from coming in here.
*/
if (GpeEventInfo->Handler)
{
/* Invoke the installed handler (at interrupt level) */
GpeEventInfo->Handler (GpeEventInfo->Context);
/* It is now safe to clear level-triggered events. */
if (GpeEventInfo->Flags & ACPI_EVENT_LEVEL_TRIGGERED)
{
Status = AcpiHwClearGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_REPORT_ERROR ((
"AcpiEvGpeDispatch: Unable to clear GPE[%2X]\n",
GpeNumber));
return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
}
}
}
else if (GpeEventInfo->MethodNode)
{
/*
* Disable GPE, so it doesn't keep firing before the method has a
* chance to run.
*/
Status = AcpiHwDisableGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_REPORT_ERROR ((
"AcpiEvGpeDispatch: Unable to disable GPE[%2X]\n",
GpeNumber));
return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
}
/*
* Execute the method associated with the GPE
* NOTE: Level-triggered GPEs are cleared after the method completes.
*/
if (ACPI_FAILURE (AcpiOsQueueForExecution (OSD_PRIORITY_GPE,
AcpiEvAsynchExecuteGpeMethod,
GpeEventInfo)))
{
ACPI_REPORT_ERROR ((
"AcpiEvGpeDispatch: Unable to queue handler for GPE[%2X], event is disabled\n",
GpeNumber));
}
}
else
{
/* No handler or method to run! */
ACPI_REPORT_ERROR ((
"AcpiEvGpeDispatch: No handler or method for GPE[%2X], disabling event\n",
GpeNumber));
/*
* Disable the GPE. The GPE will remain disabled until the ACPI
* Core Subsystem is restarted, or a handler is installed.
*/
Status = AcpiHwDisableGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_REPORT_ERROR ((
"AcpiEvGpeDispatch: Unable to disable GPE[%2X]\n",
GpeNumber));
return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
}
}
return_VALUE (ACPI_INTERRUPT_HANDLED);
}
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