/******************************************************************************
*
* Module Name: hwgpe - Low level GPE enable/disable/clear functions
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2003, R. Byron Moore
* 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")
/******************************************************************************
*
* FUNCTION: acpi_hw_enable_gpe
*
* PARAMETERS: gpe_number - The GPE
*
* RETURN: None
*
* DESCRIPTION: Enable a single GPE.
*
******************************************************************************/
acpi_status
acpi_hw_enable_gpe (
struct acpi_gpe_event_info *gpe_event_info)
{
u32 in_byte;
acpi_status status;
ACPI_FUNCTION_ENTRY ();
/*
* Read the current value of the register, set the appropriate bit
* to enable the GPE, and write out the new register.
*/
status = acpi_hw_low_level_read (8, &in_byte,
&gpe_event_info->register_info->enable_address);
if (ACPI_FAILURE (status)) {
return (status);
}
/* Write with the new GPE bit enabled */
status = acpi_hw_low_level_write (8, (in_byte | gpe_event_info->bit_mask),
&gpe_event_info->register_info->enable_address);
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_enable_gpe_for_wakeup
*
* PARAMETERS: gpe_number - The GPE
*
* RETURN: None
*
* DESCRIPTION: Keep track of which GPEs the OS has requested not be
* disabled when going to sleep.
*
******************************************************************************/
void
acpi_hw_enable_gpe_for_wakeup (
struct acpi_gpe_event_info *gpe_event_info)
{
struct acpi_gpe_register_info *gpe_register_info;
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;
}
/*
* Set the bit so we will not disable this when sleeping
*/
gpe_register_info->wake_enable |= gpe_event_info->bit_mask;
}
/******************************************************************************
*
* FUNCTION: acpi_hw_disable_gpe
*
* PARAMETERS: gpe_number - The GPE
*
* RETURN: None
*
* DESCRIPTION: Disable a single GPE.
*
******************************************************************************/
acpi_status
acpi_hw_disable_gpe (
struct acpi_gpe_event_info *gpe_event_info)
{
u32 in_byte;
acpi_status status;
struct acpi_gpe_register_info *gpe_register_info;
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_BAD_PARAMETER);
}
/*
* Read the current value of the register, clear the appropriate bit,
* and write out the new register value to disable the GPE.
*/
status = acpi_hw_low_level_read (8, &in_byte,
&gpe_register_info->enable_address);
if (ACPI_FAILURE (status)) {
return (status);
}
/* Write the byte with this GPE bit cleared */
status = acpi_hw_low_level_write (8, (in_byte & ~(gpe_event_info->bit_mask)),
&gpe_register_info->enable_address);
if (ACPI_FAILURE (status)) {
return (status);
}
acpi_hw_disable_gpe_for_wakeup (gpe_event_info);
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_disable_gpe_for_wakeup
*
* PARAMETERS: gpe_number - The GPE
*
* RETURN: None
*
* DESCRIPTION: Keep track of which GPEs the OS has requested not be
* disabled when going to sleep.
*
******************************************************************************/
void
acpi_hw_disable_gpe_for_wakeup (
struct acpi_gpe_event_info *gpe_event_info)
{
struct acpi_gpe_register_info *gpe_register_info;
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;
}
/*
* Clear the bit so we will disable this when sleeping
*/
gpe_register_info->wake_enable &= ~(gpe_event_info->bit_mask);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_clear_gpe
*
* PARAMETERS: gpe_number - The GPE
*
* RETURN: None
*
* DESCRIPTION: Clear a single GPE.
*
******************************************************************************/
acpi_status
acpi_hw_clear_gpe (
struct acpi_gpe_event_info *gpe_event_info)
{
acpi_status status;
ACPI_FUNCTION_ENTRY ();
/*
* Write a one to the appropriate bit in the status register to
* clear this GPE.
*/
status = acpi_hw_low_level_write (8, gpe_event_info->bit_mask,
&gpe_event_info->register_info->status_address);
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_get_gpe_status
*
* PARAMETERS: gpe_number - The GPE
*
* RETURN: None
*
* 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 bit_mask;
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 */
bit_mask = gpe_event_info->bit_mask;
/* GPE Enabled? */
status = acpi_hw_low_level_read (8, &in_byte, &gpe_register_info->enable_address);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
if (bit_mask & in_byte) {
local_event_status |= ACPI_EVENT_FLAG_ENABLED;
}
/* GPE Enabled for wake? */
if (bit_mask & gpe_register_info->wake_enable) {
local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
}
/* GPE active (set)? */
status = acpi_hw_low_level_read (8, &in_byte, &gpe_register_info->status_address);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
if (bit_mask & 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 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;
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
/* Get the register info for the entire GPE block */
gpe_register_info = gpe_block->register_info;
/* Examine each GPE Register within the block */
for (i = 0; i < gpe_block->register_count; i++) {
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 all GPEs within a 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;
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
/* Get the register info for the entire GPE block */
gpe_register_info = gpe_block->register_info;
/* Examine each GPE Register within the block */
for (i = 0; i < gpe_block->register_count; i++) {
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_disable_non_wakeup_gpe_block
*
* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
* gpe_block - Gpe Block info
*
* RETURN: Status
*
* DESCRIPTION: Disable all GPEs except wakeup GPEs in a GPE block
*
******************************************************************************/
static acpi_status
acpi_hw_disable_non_wakeup_gpe_block (
struct acpi_gpe_xrupt_info *gpe_xrupt_info,
struct acpi_gpe_block_info *gpe_block)
{
u32 i;
struct acpi_gpe_register_info *gpe_register_info;
u32 in_value;
acpi_status status;
/* Get the register info for the entire GPE block */
gpe_register_info = gpe_block->register_info;
/* Examine each GPE Register within the block */
for (i = 0; i < gpe_block->register_count; i++) {
/*
* Read the enabled status of all GPEs. We
* will be using it to restore all the GPEs later.
*/
status = acpi_hw_low_level_read (8, &in_value,
&gpe_register_info->enable_address);
if (ACPI_FAILURE (status)) {
return (status);
}
gpe_register_info->enable = (u8) in_value;
/*
* Disable all GPEs except wakeup GPEs.
*/
status = acpi_hw_low_level_write (8, gpe_register_info->wake_enable,
&gpe_register_info->enable_address);
if (ACPI_FAILURE (status)) {
return (status);
}
gpe_register_info++;
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_disable_non_wakeup_gpes
*
* PARAMETERS: None
*
* RETURN: None
*
* DESCRIPTION: Disable all non-wakeup GPEs
* Called with interrupts disabled. The interrupt handler also
* modifies gpe_register_info->Enable, so it should not be
* given the chance to run until after non-wake GPEs are
* re-enabled.
*
******************************************************************************/
acpi_status
acpi_hw_disable_non_wakeup_gpes (
void)
{
acpi_status status;
ACPI_FUNCTION_ENTRY ();
status = acpi_ev_walk_gpe_list (acpi_hw_disable_non_wakeup_gpe_block);
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_enable_non_wakeup_gpe_block
*
* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
* gpe_block - Gpe Block info
*
* RETURN: Status
*
* DESCRIPTION: Enable a single GPE.
*
******************************************************************************/
static acpi_status
acpi_hw_enable_non_wakeup_gpe_block (
struct acpi_gpe_xrupt_info *gpe_xrupt_info,
struct acpi_gpe_block_info *gpe_block)
{
u32 i;
struct acpi_gpe_register_info *gpe_register_info;
acpi_status status;
/* This callback processes one entire GPE block */
/* Get the register info for the entire GPE block */
gpe_register_info = gpe_block->register_info;
/* Examine each GPE register within the block */
for (i = 0; i < gpe_block->register_count; i++) {
/*
* We previously stored the enabled status of all GPEs.
* Blast them back in.
*/
status = acpi_hw_low_level_write (8, gpe_register_info->enable,
&gpe_register_info->enable_address);
if (ACPI_FAILURE (status)) {
return (status);
}
gpe_register_info++;
}
return (AE_OK);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_enable_non_wakeup_gpes
*
* PARAMETERS: None
*
* RETURN: None
*
* DESCRIPTION: Enable all non-wakeup GPEs we previously enabled.
*
******************************************************************************/
acpi_status
acpi_hw_enable_non_wakeup_gpes (
void)
{
acpi_status status;
ACPI_FUNCTION_ENTRY ();
status = acpi_ev_walk_gpe_list (acpi_hw_enable_non_wakeup_gpe_block);
return (status);
}
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