kevin/linux
1
Fork 0
Code
3fa2cdcc45
linux/drivers/acpi/hardware/hwsleep.c
Rafael J. Wysocki 3c1d2b6085 ACPI: Separate disabling of GPEs from _PTS 
The preparation to enter an ACPI system sleep state is now tied to
the disabling of GPEs, but the GPEs should not be disabled before
suspending devices.  Since on ACPI 1.0x systems the _PTS global
control method should be executed before suspending devices, we
need to disable GPEs separately.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-02-01 18:30:56 -05:00

647 lines
18 KiB
C
Raw Blame History

/******************************************************************************
*
* Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2007, 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/actables.h>
#define _COMPONENT ACPI_HARDWARE
ACPI_MODULE_NAME("hwsleep")
/*******************************************************************************
*
* FUNCTION: acpi_set_firmware_waking_vector
*
* PARAMETERS: physical_address - Physical address of ACPI real mode
* entry point.
*
* RETURN: Status
*
* DESCRIPTION: Access function for the firmware_waking_vector field in FACS
*
******************************************************************************/
acpi_status
acpi_set_firmware_waking_vector(acpi_physical_address physical_address)
{
struct acpi_table_facs *facs;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
/* Get the FACS */
status =
acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
(struct acpi_table_header **)&facs);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Set the vector */
if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
/*
* ACPI 1.0 FACS or short table or optional X_ field is zero
*/
facs->firmware_waking_vector = (u32) physical_address;
} else {
/*
* ACPI 2.0 FACS with valid X_ field
*/
facs->xfirmware_waking_vector = physical_address;
}
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
/*******************************************************************************
*
* FUNCTION: acpi_get_firmware_waking_vector
*
* PARAMETERS: *physical_address - Where the contents of
* the firmware_waking_vector field of
* the FACS will be returned.
*
* RETURN: Status, vector
*
* DESCRIPTION: Access function for the firmware_waking_vector field in FACS
*
******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_get_firmware_waking_vector(acpi_physical_address * physical_address)
{
struct acpi_table_facs *facs;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_get_firmware_waking_vector);
if (!physical_address) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Get the FACS */
status =
acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
(struct acpi_table_header **)&facs);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Get the vector */
if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
/*
* ACPI 1.0 FACS or short table or optional X_ field is zero
*/
*physical_address =
(acpi_physical_address) facs->firmware_waking_vector;
} else {
/*
* ACPI 2.0 FACS with valid X_ field
*/
*physical_address =
(acpi_physical_address) facs->xfirmware_waking_vector;
}
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_get_firmware_waking_vector)
#endif
/*******************************************************************************
*
* FUNCTION: acpi_enter_sleep_state_prep
*
* PARAMETERS: sleep_state - Which sleep state to enter
*
* RETURN: Status
*
* DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
* This function must execute with interrupts enabled.
* We break sleeping into 2 stages so that OSPM can handle
* various OS-specific tasks between the two steps.
*
******************************************************************************/
acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
{
acpi_status status;
struct acpi_object_list arg_list;
union acpi_object arg;
ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
/*
* _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
*/
status = acpi_get_sleep_type_data(sleep_state,
&acpi_gbl_sleep_type_a,
&acpi_gbl_sleep_type_b);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Setup parameter object */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = sleep_state;
/* Run the _PTS method */
status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
return_ACPI_STATUS(status);
}
/* Setup the argument to _SST */
switch (sleep_state) {
case ACPI_STATE_S0:
arg.integer.value = ACPI_SST_WORKING;
break;
case ACPI_STATE_S1:
case ACPI_STATE_S2:
case ACPI_STATE_S3:
arg.integer.value = ACPI_SST_SLEEPING;
break;
case ACPI_STATE_S4:
arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
break;
default:
arg.integer.value = ACPI_SST_INDICATOR_OFF; /* Default is off */
break;
}
/* Set the system indicators to show the desired sleep state. */
status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
ACPI_EXCEPTION((AE_INFO, status,
"While executing method _SST"));
}
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
/*******************************************************************************
*
* FUNCTION: acpi_enter_sleep_state
*
* PARAMETERS: sleep_state - Which sleep state to enter
*
* RETURN: Status
*
* DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
*
******************************************************************************/
acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
{
u32 PM1Acontrol;
u32 PM1Bcontrol;
struct acpi_bit_register_info *sleep_type_reg_info;
struct acpi_bit_register_info *sleep_enable_reg_info;
u32 in_value;
struct acpi_object_list arg_list;
union acpi_object arg;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
(acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
}
sleep_type_reg_info =
acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
sleep_enable_reg_info =
acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
/* Clear wake status */
status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Clear all fixed and general purpose status bits */
status = acpi_hw_clear_acpi_status();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* 2) Enable all wakeup GPEs
*/
status = acpi_hw_disable_all_gpes();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
acpi_gbl_system_awake_and_running = FALSE;
status = acpi_hw_enable_all_wakeup_gpes();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Execute the _GTS method */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = sleep_state;
status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
return_ACPI_STATUS(status);
}
/* Get current value of PM1A control */
status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
ACPI_DEBUG_PRINT((ACPI_DB_INIT,
"Entering sleep state [S%d]\n", sleep_state));
/* Clear SLP_EN and SLP_TYP fields */
PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
sleep_enable_reg_info->access_bit_mask);
PM1Bcontrol = PM1Acontrol;
/* Insert SLP_TYP bits */
PM1Acontrol |=
(acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
PM1Bcontrol |=
(acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
/*
* We split the writes of SLP_TYP and SLP_EN to workaround
* poorly implemented hardware.
*/
/* Write #1: fill in SLP_TYP data */
status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
PM1Acontrol);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
PM1Bcontrol);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Insert SLP_ENABLE bit */
PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
/* Write #2: SLP_TYP + SLP_EN */
ACPI_FLUSH_CPU_CACHE();
status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
PM1Acontrol);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
PM1Bcontrol);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
if (sleep_state > ACPI_STATE_S3) {
/*
* We wanted to sleep > S3, but it didn't happen (by virtue of the
* fact that we are still executing!)
*
* Wait ten seconds, then try again. This is to get S4/S5 to work on
* all machines.
*
* We wait so long to allow chipsets that poll this reg very slowly to
* still read the right value. Ideally, this block would go
* away entirely.
*/
acpi_os_stall(10000000);
status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
sleep_enable_reg_info->
access_bit_mask);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/* Wait until we enter sleep state */
do {
status = acpi_get_register_unlocked(ACPI_BITREG_WAKE_STATUS,
&in_value);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Spin until we wake */
} while (!in_value);
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
/*******************************************************************************
*
* FUNCTION: acpi_enter_sleep_state_s4bios
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Perform a S4 bios request.
* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
*
******************************************************************************/
acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
{
u32 in_value;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_hw_clear_acpi_status();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* 1) Disable/Clear all GPEs
* 2) Enable all wakeup GPEs
*/
status = acpi_hw_disable_all_gpes();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
acpi_gbl_system_awake_and_running = FALSE;
status = acpi_hw_enable_all_wakeup_gpes();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
ACPI_FLUSH_CPU_CACHE();
status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
(u32) acpi_gbl_FADT.S4bios_request, 8);
do {
acpi_os_stall(1000);
status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
} while (!in_value);
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
/*******************************************************************************
*
* FUNCTION: acpi_leave_sleep_state_prep
*
* PARAMETERS: sleep_state - Which sleep state we are exiting
*
* RETURN: Status
*
* DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
* sleep.
* Called with interrupts DISABLED.
*
******************************************************************************/
acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
{
struct acpi_object_list arg_list;
union acpi_object arg;
acpi_status status;
struct acpi_bit_register_info *sleep_type_reg_info;
struct acpi_bit_register_info *sleep_enable_reg_info;
u32 PM1Acontrol;
u32 PM1Bcontrol;
ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
/*
* Set SLP_TYPE and SLP_EN to state S0.
* This is unclear from the ACPI Spec, but it is required
* by some machines.
*/
status = acpi_get_sleep_type_data(ACPI_STATE_S0,
&acpi_gbl_sleep_type_a,
&acpi_gbl_sleep_type_b);
if (ACPI_SUCCESS(status)) {
sleep_type_reg_info =
acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
sleep_enable_reg_info =
acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
/* Get current value of PM1A control */
status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
&PM1Acontrol);
if (ACPI_SUCCESS(status)) {
/* Clear SLP_EN and SLP_TYP fields */
PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
sleep_enable_reg_info->
access_bit_mask);
PM1Bcontrol = PM1Acontrol;
/* Insert SLP_TYP bits */
PM1Acontrol |=
(acpi_gbl_sleep_type_a << sleep_type_reg_info->
bit_position);
PM1Bcontrol |=
(acpi_gbl_sleep_type_b << sleep_type_reg_info->
bit_position);
/* Just ignore any errors */
(void)acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
PM1Acontrol);
(void)acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
PM1Bcontrol);
}
}
/* Execute the _BFS method */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = sleep_state;
status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_leave_sleep_state
*
* PARAMETERS: sleep_state - Which sleep state we just exited
*
* RETURN: Status
*
* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
* Called with interrupts ENABLED.
*
******************************************************************************/
acpi_status acpi_leave_sleep_state(u8 sleep_state)
{
struct acpi_object_list arg_list;
union acpi_object arg;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
/* Setup parameter object */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
/* Ignore any errors from these methods */
arg.integer.value = ACPI_SST_WAKING;
status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
}
/*
* GPEs must be enabled before _WAK is called as GPEs
* might get fired there
*
* Restore the GPEs:
* 1) Disable/Clear all GPEs
* 2) Enable all runtime GPEs
*/
status = acpi_hw_disable_all_gpes();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_hw_enable_all_runtime_gpes();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
}
/* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
acpi_gbl_system_awake_and_running = TRUE;
/* Enable power button */
(void)
acpi_set_register(acpi_gbl_fixed_event_info
[ACPI_EVENT_POWER_BUTTON].enable_register_id, 1);
(void)
acpi_set_register(acpi_gbl_fixed_event_info
[ACPI_EVENT_POWER_BUTTON].status_register_id, 1);
arg.integer.value = ACPI_SST_WORKING;
status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
}
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)
View Git Blame Copy Permalink