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linux/drivers/acpi/acpica/evgpeinit.c

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/******************************************************************************
*
* Module Name: evgpeinit - System GPE initialization and update
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2010, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"
#include "acinterp.h"
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME("evgpeinit")
/*******************************************************************************
*
* FUNCTION: acpi_ev_gpe_initialize
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
*
******************************************************************************/
acpi_status acpi_ev_gpe_initialize(void)
{
u32 register_count0 = 0;
u32 register_count1 = 0;
u32 gpe_number_max = 0;
acpi_status status;
ACPI_FUNCTION_TRACE(ev_gpe_initialize);
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Initialize the GPE Block(s) defined in the FADT
*
* Why the GPE register block lengths are divided by 2: From the ACPI
* Spec, section "General-Purpose Event Registers", we have:
*
* "Each register block contains two registers of equal length
* GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
* GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
* The length of the GPE1_STS and GPE1_EN registers is equal to
* half the GPE1_LEN. If a generic register block is not supported
* then its respective block pointer and block length values in the
* FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
* to be the same size."
*/
/*
* Determine the maximum GPE number for this machine.
*
* Note: both GPE0 and GPE1 are optional, and either can exist without
* the other.
*
* If EITHER the register length OR the block address are zero, then that
* particular block is not supported.
*/
if (acpi_gbl_FADT.gpe0_block_length &&
acpi_gbl_FADT.xgpe0_block.address) {
/* GPE block 0 exists (has both length and address > 0) */
register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2);
gpe_number_max =
(register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
/* Install GPE Block 0 */
status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
&acpi_gbl_FADT.xgpe0_block,
register_count0, 0,
acpi_gbl_FADT.sci_interrupt,
&acpi_gbl_gpe_fadt_blocks[0]);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not create GPE Block 0"));
}
}
if (acpi_gbl_FADT.gpe1_block_length &&
acpi_gbl_FADT.xgpe1_block.address) {
/* GPE block 1 exists (has both length and address > 0) */
register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2);
/* Check for GPE0/GPE1 overlap (if both banks exist) */
if ((register_count0) &&
(gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
ACPI_ERROR((AE_INFO,
"GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
"(GPE %u to %u) - Ignoring GPE1",
gpe_number_max, acpi_gbl_FADT.gpe1_base,
acpi_gbl_FADT.gpe1_base +
((register_count1 *
ACPI_GPE_REGISTER_WIDTH) - 1)));
/* Ignore GPE1 block by setting the register count to zero */
register_count1 = 0;
} else {
/* Install GPE Block 1 */
status =
acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
&acpi_gbl_FADT.xgpe1_block,
register_count1,
acpi_gbl_FADT.gpe1_base,
acpi_gbl_FADT.
sci_interrupt,
&acpi_gbl_gpe_fadt_blocks
[1]);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not create GPE Block 1"));
}
/*
* GPE0 and GPE1 do not have to be contiguous in the GPE number
* space. However, GPE0 always starts at GPE number zero.
*/
gpe_number_max = acpi_gbl_FADT.gpe1_base +
((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
}
}
/* Exit if there are no GPE registers */
if ((register_count0 + register_count1) == 0) {
/* GPEs are not required by ACPI, this is OK */
ACPI_DEBUG_PRINT((ACPI_DB_INIT,
"There are no GPE blocks defined in the FADT\n"));
status = AE_OK;
goto cleanup;
}
/* Check for Max GPE number out-of-range */
if (gpe_number_max > ACPI_GPE_MAX) {
ACPI_ERROR((AE_INFO,
"Maximum GPE number from FADT is too large: 0x%X",
gpe_number_max));
status = AE_BAD_VALUE;
goto cleanup;
}
cleanup:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_update_gpes
*
* PARAMETERS: table_owner_id - ID of the newly-loaded ACPI table
*
* RETURN: None
*
* DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
* result of a Load() or load_table() operation. If new GPE
* methods have been installed, register the new methods and
* enable and runtime GPEs that are associated with them. Also,
* run any newly loaded _PRW methods in order to discover any
* new CAN_WAKE GPEs.
*
******************************************************************************/
void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
{
struct acpi_gpe_xrupt_info *gpe_xrupt_info;
struct acpi_gpe_block_info *gpe_block;
struct acpi_gpe_walk_info walk_info;
acpi_status status = AE_OK;
u32 new_wake_gpe_count = 0;
/* We will examine only _PRW/_Lxx/_Exx methods owned by this table */
walk_info.owner_id = table_owner_id;
walk_info.execute_by_owner_id = TRUE;
walk_info.count = 0;
if (acpi_gbl_leave_wake_gpes_disabled) {
/*
* 1) Run any newly-loaded _PRW methods to find any GPEs that
* can now be marked as CAN_WAKE GPEs. Note: We must run the
* _PRW methods before we process the _Lxx/_Exx methods because
* we will enable all runtime GPEs associated with the new
* _Lxx/_Exx methods at the time we process those methods.
*
* Unlock interpreter so that we can run the _PRW methods.
*/
walk_info.gpe_block = NULL;
walk_info.gpe_device = NULL;
acpi_ex_exit_interpreter();
status =
acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
ACPI_NS_WALK_NO_UNLOCK,
acpi_ev_match_prw_and_gpe, NULL,
&walk_info, NULL);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"While executing _PRW methods"));
}
acpi_ex_enter_interpreter();
new_wake_gpe_count = walk_info.count;
}
/*
* 2) Find any _Lxx/_Exx GPE methods that have just been loaded.
*
* Any GPEs that correspond to new _Lxx/_Exx methods and are not
* marked as CAN_WAKE are immediately enabled.
*
* Examine the namespace underneath each gpe_device within the
* gpe_block lists.
*/
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return;
}
walk_info.count = 0;
walk_info.enable_this_gpe = TRUE;
/* Walk the interrupt level descriptor list */
gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
while (gpe_xrupt_info) {
/* Walk all Gpe Blocks attached to this interrupt level */
gpe_block = gpe_xrupt_info->gpe_block_list_head;
while (gpe_block) {
walk_info.gpe_block = gpe_block;
walk_info.gpe_device = gpe_block->node;
status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD,
walk_info.gpe_device,
ACPI_UINT32_MAX,
ACPI_NS_WALK_NO_UNLOCK,
acpi_ev_match_gpe_method,
NULL, &walk_info, NULL);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"While decoding _Lxx/_Exx methods"));
}
gpe_block = gpe_block->next;
}
gpe_xrupt_info = gpe_xrupt_info->next;
}
if (walk_info.count || new_wake_gpe_count) {
ACPI_INFO((AE_INFO,
"Enabled %u new runtime GPEs, added %u new wakeup GPEs",
walk_info.count, new_wake_gpe_count));
}
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return;
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_match_gpe_method
*
* PARAMETERS: Callback from walk_namespace
*
* RETURN: Status
*
* DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
* control method under the _GPE portion of the namespace.
* Extract the name and GPE type from the object, saving this
* information for quick lookup during GPE dispatch. Allows a
* per-owner_id evaluation if execute_by_owner_id is TRUE in the
* walk_info parameter block.
*
* The name of each GPE control method is of the form:
* "_Lxx" or "_Exx", where:
* L - means that the GPE is level triggered
* E - means that the GPE is edge triggered
* xx - is the GPE number [in HEX]
*
* If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods
* with that owner.
* If walk_info->enable_this_gpe is TRUE, the GPE that is referred to by a GPE
* method is immediately enabled (Used for Load/load_table operators)
*
******************************************************************************/
acpi_status
acpi_ev_match_gpe_method(acpi_handle obj_handle,
u32 level, void *context, void **return_value)
{
struct acpi_namespace_node *method_node =
ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
struct acpi_gpe_walk_info *walk_info =
ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
struct acpi_gpe_event_info *gpe_event_info;
struct acpi_namespace_node *gpe_device;
acpi_status status;
u32 gpe_number;
char name[ACPI_NAME_SIZE + 1];
u8 type;
ACPI_FUNCTION_TRACE(ev_match_gpe_method);
/* Check if requested owner_id matches this owner_id */
if ((walk_info->execute_by_owner_id) &&
(method_node->owner_id != walk_info->owner_id)) {
return_ACPI_STATUS(AE_OK);
}
/*
* Match and decode the _Lxx and _Exx GPE method names
*
* 1) Extract the method name and null terminate it
*/
ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
name[ACPI_NAME_SIZE] = 0;
/* 2) Name must begin with an underscore */
if (name[0] != '_') {
return_ACPI_STATUS(AE_OK); /* Ignore this method */
}
/*
* 3) Edge/Level determination is based on the 2nd character
* of the method name
*
* NOTE: Default GPE type is RUNTIME only. Later, if a _PRW object is
* found that points to this GPE, the ACPI_GPE_CAN_WAKE flag is set.
*/
switch (name[1]) {
case 'L':
type = ACPI_GPE_LEVEL_TRIGGERED;
break;
case 'E':
type = ACPI_GPE_EDGE_TRIGGERED;
break;
default:
/* Unknown method type, just ignore it */
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
"Ignoring unknown GPE method type: %s "
"(name not of form _Lxx or _Exx)", name));
return_ACPI_STATUS(AE_OK);
}
/* 4) The last two characters of the name are the hex GPE Number */
gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
if (gpe_number == ACPI_UINT32_MAX) {
/* Conversion failed; invalid method, just ignore it */
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
"Could not extract GPE number from name: %s "
"(name is not of form _Lxx or _Exx)", name));
return_ACPI_STATUS(AE_OK);
}
/* Ensure that we have a valid GPE number for this GPE block */
gpe_event_info =
acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
if (!gpe_event_info) {
/*
* This gpe_number is not valid for this GPE block, just ignore it.
* However, it may be valid for a different GPE block, since GPE0
* and GPE1 methods both appear under \_GPE.
*/
return_ACPI_STATUS(AE_OK);
}
if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
ACPI_GPE_DISPATCH_HANDLER) {
/* If there is already a handler, ignore this GPE method */
return_ACPI_STATUS(AE_OK);
}
if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
ACPI_GPE_DISPATCH_METHOD) {
/*
* If there is already a method, ignore this method. But check
* for a type mismatch (if both the _Lxx AND _Exx exist)
*/
if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
ACPI_ERROR((AE_INFO,
"For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
gpe_number, gpe_number, gpe_number));
}
return_ACPI_STATUS(AE_OK);
}
/*
* Add the GPE information from above to the gpe_event_info block for
* use during dispatch of this GPE.
*/
gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD);
gpe_event_info->dispatch.method_node = method_node;
/*
* Enable this GPE if requested. This only happens when during the
* execution of a Load or load_table operator. We have found a new
* GPE method and want to immediately enable the GPE if it is a
* runtime GPE.
*/
if (walk_info->enable_this_gpe) {
/* Ignore GPEs that can wake the system */
if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE) ||
!acpi_gbl_leave_wake_gpes_disabled) {
walk_info->count++;
gpe_device = walk_info->gpe_device;
if (gpe_device == acpi_gbl_fadt_gpe_device) {
gpe_device = NULL;
}
status = acpi_enable_gpe(gpe_device, gpe_number,
ACPI_GPE_TYPE_RUNTIME);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not enable GPE 0x%02X",
gpe_number));
}
}
}
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
"Registered GPE method %s as GPE number 0x%.2X\n",
name, gpe_number));
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_match_prw_and_gpe
*
* PARAMETERS: Callback from walk_namespace
*
* RETURN: Status. NOTE: We ignore errors so that the _PRW walk is
* not aborted on a single _PRW failure.
*
* DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
* Device. Run the _PRW method. If present, extract the GPE
* number and mark the GPE as a CAN_WAKE GPE. Allows a
* per-owner_id execution if execute_by_owner_id is TRUE in the
* walk_info parameter block.
*
* If walk_info->execute_by_owner_id is TRUE, we only execute _PRWs with that
* owner.
* If walk_info->gpe_device is NULL, we execute every _PRW found. Otherwise,
* we only execute _PRWs that refer to the input gpe_device.
*
******************************************************************************/
acpi_status
acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
u32 level, void *context, void **return_value)
{
struct acpi_gpe_walk_info *walk_info =
ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
struct acpi_namespace_node *gpe_device;
struct acpi_gpe_block_info *gpe_block;
struct acpi_namespace_node *target_gpe_device;
struct acpi_namespace_node *prw_node;
struct acpi_gpe_event_info *gpe_event_info;
union acpi_operand_object *pkg_desc;
union acpi_operand_object *obj_desc;
u32 gpe_number;
acpi_status status;
ACPI_FUNCTION_TRACE(ev_match_prw_and_gpe);
/* Check for a _PRW method under this device */
status = acpi_ns_get_node(obj_handle, METHOD_NAME__PRW,
ACPI_NS_NO_UPSEARCH, &prw_node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(AE_OK);
}
/* Check if requested owner_id matches this owner_id */
if ((walk_info->execute_by_owner_id) &&
(prw_node->owner_id != walk_info->owner_id)) {
return_ACPI_STATUS(AE_OK);
}
/* Execute the _PRW */
status = acpi_ut_evaluate_object(prw_node, NULL,
ACPI_BTYPE_PACKAGE, &pkg_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(AE_OK);
}
/* The returned _PRW package must have at least two elements */
if (pkg_desc->package.count < 2) {
goto cleanup;
}
/* Extract pointers from the input context */
gpe_device = walk_info->gpe_device;
gpe_block = walk_info->gpe_block;
/*
* The _PRW object must return a package, we are only interested
* in the first element
*/
obj_desc = pkg_desc->package.elements[0];
if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
/* Use FADT-defined GPE device (from definition of _PRW) */
target_gpe_device = NULL;
if (gpe_device) {
target_gpe_device = acpi_gbl_fadt_gpe_device;
}
/* Integer is the GPE number in the FADT described GPE blocks */
gpe_number = (u32)obj_desc->integer.value;
} else if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
/* Package contains a GPE reference and GPE number within a GPE block */
if ((obj_desc->package.count < 2) ||
((obj_desc->package.elements[0])->common.type !=
ACPI_TYPE_LOCAL_REFERENCE) ||
((obj_desc->package.elements[1])->common.type !=
ACPI_TYPE_INTEGER)) {
goto cleanup;
}
/* Get GPE block reference and decode */
target_gpe_device =
obj_desc->package.elements[0]->reference.node;
gpe_number = (u32)obj_desc->package.elements[1]->integer.value;
} else {
/* Unknown type, just ignore it */
goto cleanup;
}
/* Get the gpe_event_info for this GPE */
if (gpe_device) {
/*
* Is this GPE within this block?
*
* TRUE if and only if these conditions are true:
* 1) The GPE devices match.
* 2) The GPE index(number) is within the range of the Gpe Block
* associated with the GPE device.
*/
if (gpe_device != target_gpe_device) {
goto cleanup;
}
gpe_event_info =
acpi_ev_low_get_gpe_info(gpe_number, gpe_block);
} else {
/* gpe_device is NULL, just match the target_device and gpe_number */
gpe_event_info =
acpi_ev_get_gpe_event_info(target_gpe_device, gpe_number);
}
if (gpe_event_info) {
if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
/* This GPE can wake the system */
gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
walk_info->count++;
}
}
cleanup:
acpi_ut_remove_reference(pkg_desc);
return_ACPI_STATUS(AE_OK);
}
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