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/****************************************************************************** |
* |
* Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the |
* original/legacy sleep/PM registers. |
* |
*****************************************************************************/ |
|
/* |
* Copyright (C) 2000 - 2015, 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 <linux/acpi.h> |
#include "accommon.h" |
|
#define _COMPONENT ACPI_HARDWARE |
ACPI_MODULE_NAME("hwsleep") |
|
#if (!ACPI_REDUCED_HARDWARE) /* Entire module */ |
/******************************************************************************* |
* |
* FUNCTION: acpi_hw_legacy_sleep |
* |
* PARAMETERS: sleep_state - Which sleep state to enter |
* |
* RETURN: Status |
* |
* DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers |
* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED |
* |
******************************************************************************/ |
acpi_status acpi_hw_legacy_sleep(u8 sleep_state) |
{ |
struct acpi_bit_register_info *sleep_type_reg_info; |
struct acpi_bit_register_info *sleep_enable_reg_info; |
u32 pm1a_control; |
u32 pm1b_control; |
u32 in_value; |
acpi_status status; |
|
ACPI_FUNCTION_TRACE(hw_legacy_sleep); |
|
sleep_type_reg_info = |
acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE); |
sleep_enable_reg_info = |
acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE); |
|
/* Clear wake status */ |
|
status = |
acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS); |
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); |
} |
|
/* |
* 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); |
} |
|
/* Get current value of PM1A control */ |
|
status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, |
&pm1a_control); |
if (ACPI_FAILURE(status)) { |
return_ACPI_STATUS(status); |
} |
ACPI_DEBUG_PRINT((ACPI_DB_INIT, |
"Entering sleep state [S%u]\n", sleep_state)); |
|
/* Clear the SLP_EN and SLP_TYP fields */ |
|
pm1a_control &= ~(sleep_type_reg_info->access_bit_mask | |
sleep_enable_reg_info->access_bit_mask); |
pm1b_control = pm1a_control; |
|
/* Insert the SLP_TYP bits */ |
|
pm1a_control |= |
(acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position); |
pm1b_control |= |
(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: write the SLP_TYP data to the PM1 Control registers */ |
|
status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control); |
if (ACPI_FAILURE(status)) { |
return_ACPI_STATUS(status); |
} |
|
/* Insert the sleep enable (SLP_EN) bit */ |
|
pm1a_control |= sleep_enable_reg_info->access_bit_mask; |
pm1b_control |= sleep_enable_reg_info->access_bit_mask; |
|
/* Flush caches, as per ACPI specification */ |
|
ACPI_FLUSH_CPU_CACHE(); |
|
status = acpi_os_prepare_sleep(sleep_state, pm1a_control, |
pm1b_control); |
if (ACPI_SKIP(status)) |
return_ACPI_STATUS(AE_OK); |
if (ACPI_FAILURE(status)) |
return_ACPI_STATUS(status); |
/* Write #2: Write both SLP_TYP + SLP_EN */ |
|
status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control); |
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(10 * ACPI_USEC_PER_SEC); |
|
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 for transition back to Working State */ |
|
do { |
status = |
acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value); |
if (ACPI_FAILURE(status)) { |
return_ACPI_STATUS(status); |
} |
|
} while (!in_value); |
|
return_ACPI_STATUS(AE_OK); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_hw_legacy_wake_prep |
* |
* PARAMETERS: sleep_state - Which sleep state we just exited |
* |
* RETURN: Status |
* |
* DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a |
* sleep. |
* Called with interrupts ENABLED. |
* |
******************************************************************************/ |
|
acpi_status acpi_hw_legacy_wake_prep(u8 sleep_state) |
{ |
acpi_status status; |
struct acpi_bit_register_info *sleep_type_reg_info; |
struct acpi_bit_register_info *sleep_enable_reg_info; |
u32 pm1a_control; |
u32 pm1b_control; |
|
ACPI_FUNCTION_TRACE(hw_legacy_wake_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); |
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, |
&pm1a_control); |
if (ACPI_SUCCESS(status)) { |
|
/* Clear the SLP_EN and SLP_TYP fields */ |
|
pm1a_control &= ~(sleep_type_reg_info->access_bit_mask | |
sleep_enable_reg_info-> |
access_bit_mask); |
pm1b_control = pm1a_control; |
|
/* Insert the SLP_TYP bits */ |
|
pm1a_control |= (acpi_gbl_sleep_type_a << |
sleep_type_reg_info->bit_position); |
pm1b_control |= (acpi_gbl_sleep_type_b << |
sleep_type_reg_info->bit_position); |
|
/* Write the control registers and ignore any errors */ |
|
(void)acpi_hw_write_pm1_control(pm1a_control, |
pm1b_control); |
} |
} |
|
return_ACPI_STATUS(status); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_hw_legacy_wake |
* |
* 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_hw_legacy_wake(u8 sleep_state) |
{ |
acpi_status status; |
|
ACPI_FUNCTION_TRACE(hw_legacy_wake); |
|
/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */ |
|
acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID; |
acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING); |
|
/* |
* 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); |
} |
|
/* |
* Now we can execute _WAK, etc. Some machines require that the GPEs |
* are enabled before the wake methods are executed. |
*/ |
acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state); |
|
/* |
* Some BIOS code assumes that WAK_STS will be cleared on resume |
* and use it to determine whether the system is rebooting or |
* resuming. Clear WAK_STS for compatibility. |
*/ |
(void)acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, |
ACPI_CLEAR_STATUS); |
acpi_gbl_system_awake_and_running = TRUE; |
|
/* Enable power button */ |
|
(void) |
acpi_write_bit_register(acpi_gbl_fixed_event_info |
[ACPI_EVENT_POWER_BUTTON]. |
enable_register_id, ACPI_ENABLE_EVENT); |
|
(void) |
acpi_write_bit_register(acpi_gbl_fixed_event_info |
[ACPI_EVENT_POWER_BUTTON]. |
status_register_id, ACPI_CLEAR_STATUS); |
|
acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING); |
return_ACPI_STATUS(status); |
} |
|
#endif /* !ACPI_REDUCED_HARDWARE */ |