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linux-sg2042/drivers/acpi/hardware/hwgpe.c

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/******************************************************************************
*
* Module Name: hwgpe - Low level GPE enable/disable/clear functions
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2008, 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 <acpi/acevents.h>
#define _COMPONENT ACPI_HARDWARE
ACPI_MODULE_NAME("hwgpe")
/* Local prototypes */
static acpi_status
acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
struct acpi_gpe_block_info *gpe_block);
/******************************************************************************
*
* FUNCTION: acpi_hw_low_disable_gpe
*
* PARAMETERS: gpe_event_info - Info block for the GPE to be disabled
*
* RETURN: Status
*
* DESCRIPTION: Disable a single GPE in the enable register.
*
******************************************************************************/
acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
u32 enable_mask;
/* Get the info block for the entire GPE register */
gpe_register_info = gpe_event_info->register_info;
if (!gpe_register_info) {
return (AE_NOT_EXIST);
}
/* Get current value of the enable register that contains this GPE */
status = acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH, &enable_mask,
&gpe_register_info->enable_address);
if (ACPI_FAILURE(status)) {
return (status);
}
/* Clear just the bit that corresponds to this GPE */
ACPI_CLEAR_BIT(enable_mask,
((u32) 1 <<
(gpe_event_info->gpe_number -
gpe_register_info->base_gpe_number)));
/* Write the updated enable mask */
status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, enable_mask,
&gpe_register_info->enable_address);
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_write_gpe_enable_reg
*
* PARAMETERS: gpe_event_info - Info block for the GPE to be enabled
*
* RETURN: Status
*
* DESCRIPTION: Write a GPE enable register. Note: The bit for this GPE must
* already be cleared or set in the parent register
* enable_for_run mask.
*
******************************************************************************/
acpi_status
acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info * gpe_event_info)
{
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
ACPI_FUNCTION_ENTRY();
/* Get the info block for the entire GPE register */
gpe_register_info = gpe_event_info->register_info;
if (!gpe_register_info) {
return (AE_NOT_EXIST);
}
/* Write the entire GPE (runtime) enable register */
status = acpi_hw_low_level_write(8, gpe_register_info->enable_for_run,
&gpe_register_info->enable_address);
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_clear_gpe
*
* PARAMETERS: gpe_event_info - Info block for the GPE to be cleared
*
* RETURN: Status
*
* DESCRIPTION: Clear the status bit for a single GPE.
*
******************************************************************************/
acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
{
acpi_status status;
u8 register_bit;
ACPI_FUNCTION_ENTRY();
register_bit = (u8)
(1 <<
(gpe_event_info->gpe_number -
gpe_event_info->register_info->base_gpe_number));
/*
* Write a one to the appropriate bit in the status register to
* clear this GPE.
*/
status = acpi_hw_low_level_write(8, register_bit,
&gpe_event_info->register_info->
status_address);
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_get_gpe_status
*
* PARAMETERS: gpe_event_info - Info block for the GPE to queried
* event_status - Where the GPE status is returned
*
* RETURN: Status
*
* DESCRIPTION: Return the status of a single GPE.
*
******************************************************************************/
acpi_status
acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
acpi_event_status * event_status)
{
u32 in_byte;
u8 register_bit;
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
acpi_event_status local_event_status = 0;
ACPI_FUNCTION_ENTRY();
if (!event_status) {
return (AE_BAD_PARAMETER);
}
/* Get the info block for the entire GPE register */
gpe_register_info = gpe_event_info->register_info;
/* Get the register bitmask for this GPE */
register_bit = (u8)
(1 <<
(gpe_event_info->gpe_number -
gpe_event_info->register_info->base_gpe_number));
/* GPE currently enabled? (enabled for runtime?) */
if (register_bit & gpe_register_info->enable_for_run) {
local_event_status |= ACPI_EVENT_FLAG_ENABLED;
}
/* GPE enabled for wake? */
if (register_bit & gpe_register_info->enable_for_wake) {
local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
}
/* GPE currently active (status bit == 1)? */
status =
acpi_hw_low_level_read(8, &in_byte,
&gpe_register_info->status_address);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
if (register_bit & in_byte) {
local_event_status |= ACPI_EVENT_FLAG_SET;
}
/* Set return value */
(*event_status) = local_event_status;
unlock_and_exit:
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_disable_gpe_block
*
* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
* gpe_block - Gpe Block info
*
* RETURN: Status
*
* DESCRIPTION: Disable all GPEs within a single GPE block
*
******************************************************************************/
acpi_status
acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
struct acpi_gpe_block_info * gpe_block)
{
u32 i;
acpi_status status;
/* Examine each GPE Register within the block */
for (i = 0; i < gpe_block->register_count; i++) {
/* Disable all GPEs in this register */
status = acpi_hw_low_level_write(8, 0x00,
&gpe_block->register_info[i].
enable_address);
if (ACPI_FAILURE(status)) {
return (status);
}
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_clear_gpe_block
*
* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
* gpe_block - Gpe Block info
*
* RETURN: Status
*
* DESCRIPTION: Clear status bits for all GPEs within a single GPE block
*
******************************************************************************/
acpi_status
acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
struct acpi_gpe_block_info * gpe_block)
{
u32 i;
acpi_status status;
/* Examine each GPE Register within the block */
for (i = 0; i < gpe_block->register_count; i++) {
/* Clear status on all GPEs in this register */
status = acpi_hw_low_level_write(8, 0xFF,
&gpe_block->register_info[i].
status_address);
if (ACPI_FAILURE(status)) {
return (status);
}
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_enable_runtime_gpe_block
*
* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
* gpe_block - Gpe Block info
*
* RETURN: Status
*
* DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
* combination wake/run GPEs.
*
******************************************************************************/
acpi_status
acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
struct acpi_gpe_block_info * gpe_block)
{
u32 i;
acpi_status status;
/* NOTE: assumes that all GPEs are currently disabled */
/* Examine each GPE Register within the block */
for (i = 0; i < gpe_block->register_count; i++) {
if (!gpe_block->register_info[i].enable_for_run) {
continue;
}
/* Enable all "runtime" GPEs in this register */
status =
acpi_hw_low_level_write(8,
gpe_block->register_info[i].
enable_for_run,
&gpe_block->register_info[i].
enable_address);
if (ACPI_FAILURE(status)) {
return (status);
}
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_enable_wakeup_gpe_block
*
* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
* gpe_block - Gpe Block info
*
* RETURN: Status
*
* DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
* combination wake/run GPEs.
*
******************************************************************************/
static acpi_status
acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
struct acpi_gpe_block_info *gpe_block)
{
u32 i;
acpi_status status;
/* Examine each GPE Register within the block */
for (i = 0; i < gpe_block->register_count; i++) {
if (!gpe_block->register_info[i].enable_for_wake) {
continue;
}
/* Enable all "wake" GPEs in this register */
status = acpi_hw_low_level_write(8,
gpe_block->register_info[i].
enable_for_wake,
&gpe_block->register_info[i].
enable_address);
if (ACPI_FAILURE(status)) {
return (status);
}
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_disable_all_gpes
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Disable and clear all GPEs in all GPE blocks
*
******************************************************************************/
acpi_status acpi_hw_disable_all_gpes(void)
{
acpi_status status;
ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
return_ACPI_STATUS(status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_enable_all_runtime_gpes
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
*
******************************************************************************/
acpi_status acpi_hw_enable_all_runtime_gpes(void)
{
acpi_status status;
ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);
status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block);
return_ACPI_STATUS(status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_enable_all_wakeup_gpes
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
*
******************************************************************************/
acpi_status acpi_hw_enable_all_wakeup_gpes(void)
{
acpi_status status;
ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);
status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block);
return_ACPI_STATUS(status);
}
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