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linux/drivers/acpi/acpica/hwxfsleep.c
Len Brown 3f6f49c785 ACPI: delete _GTS/_BFS support 
_GTS and _BFS were added to the suspend/resume flow
in the ACPI 2.0 specification.

Linux dutifully implemented _GTS and _BFS.
We discovered that it was rarely seen in systems
in the field.  Further, some of those systems had
AML so bogus that it could never work -- proof that
no other operating system supports _GTS and _BFS.
So we made _GTS and _BFS optional via modparam,
and disabled them by default.

But we've had to complicate some code to keep
this support in the kernel, as these methods are defined
to be evaluated very close to sleep entry and exit.
Indeed, no other AML is ever evaluated with interrupts off.

We have submitted a proposal for _GTS and _BFS
to be officially removed from the ACPI specification
on the next revision.  Here we remove it from Linux.

Signed-off-by: Len Brown <len.brown@intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-30 21:11:25 -04:00

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/******************************************************************************
*
* Name: hwxfsleep.c - ACPI Hardware Sleep/Wake External Interfaces
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2012, 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 <linux/module.h>
#define _COMPONENT ACPI_HARDWARE
ACPI_MODULE_NAME("hwxfsleep")
/* Local prototypes */
static acpi_status
acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id);
/*
* Dispatch table used to efficiently branch to the various sleep
* functions.
*/
#define ACPI_SLEEP_FUNCTION_ID 0
#define ACPI_WAKE_PREP_FUNCTION_ID 1
#define ACPI_WAKE_FUNCTION_ID 2
/* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */
static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
{ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep),
acpi_hw_extended_sleep},
{ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep),
acpi_hw_extended_wake_prep},
{ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake), acpi_hw_extended_wake}
};
/*
* These functions are removed for the ACPI_REDUCED_HARDWARE case:
* acpi_set_firmware_waking_vector
* acpi_set_firmware_waking_vector64
* acpi_enter_sleep_state_s4bios
*/
#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
*
* FUNCTION: acpi_set_firmware_waking_vector
*
* PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
* entry point.
*
* RETURN: Status
*
* DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS
*
******************************************************************************/
acpi_status acpi_set_firmware_waking_vector(u32 physical_address)
{
ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
/*
* According to the ACPI specification 2.0c and later, the 64-bit
* waking vector should be cleared and the 32-bit waking vector should
* be used, unless we want the wake-up code to be called by the BIOS in
* Protected Mode. Some systems (for example HP dv5-1004nr) are known
* to fail to resume if the 64-bit vector is used.
*/
/* Set the 32-bit vector */
acpi_gbl_FACS->firmware_waking_vector = physical_address;
/* Clear the 64-bit vector if it exists */
if ((acpi_gbl_FACS->length > 32) && (acpi_gbl_FACS->version >= 1)) {
acpi_gbl_FACS->xfirmware_waking_vector = 0;
}
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
#if ACPI_MACHINE_WIDTH == 64
/*******************************************************************************
*
* FUNCTION: acpi_set_firmware_waking_vector64
*
* PARAMETERS: physical_address - 64-bit physical address of ACPI protected
* mode entry point.
*
* RETURN: Status
*
* DESCRIPTION: Sets the 64-bit X_firmware_waking_vector field of the FACS, if
* it exists in the table. This function is intended for use with
* 64-bit host operating systems.
*
******************************************************************************/
acpi_status acpi_set_firmware_waking_vector64(u64 physical_address)
{
ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector64);
/* Determine if the 64-bit vector actually exists */
if ((acpi_gbl_FACS->length <= 32) || (acpi_gbl_FACS->version < 1)) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
/* Clear 32-bit vector, set the 64-bit X_ vector */
acpi_gbl_FACS->firmware_waking_vector = 0;
acpi_gbl_FACS->xfirmware_waking_vector = physical_address;
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64)
#endif
/*******************************************************************************
*
* 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);
/* Clear the wake status bit (PM1) */
status =
acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
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_hw_write_port(acpi_gbl_FADT.smi_command,
(u32)acpi_gbl_FADT.s4_bios_request, 8);
do {
acpi_os_stall(1000);
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);
}
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
#endif /* !ACPI_REDUCED_HARDWARE */
/*******************************************************************************
*
* FUNCTION: acpi_hw_sleep_dispatch
*
* PARAMETERS: sleep_state - Which sleep state to enter/exit
* function_id - Sleep, wake_prep, or Wake
*
* RETURN: Status from the invoked sleep handling function.
*
* DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
* function.
*
******************************************************************************/
static acpi_status
acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
{
acpi_status status;
struct acpi_sleep_functions *sleep_functions =
&acpi_sleep_dispatch[function_id];
#if (!ACPI_REDUCED_HARDWARE)
/*
* If the Hardware Reduced flag is set (from the FADT), we must
* use the extended sleep registers
*/
if (acpi_gbl_reduced_hardware || acpi_gbl_FADT.sleep_control.address) {
status = sleep_functions->extended_function(sleep_state);
} else {
/* Legacy sleep */
status = sleep_functions->legacy_function(sleep_state);
}
return (status);
#else
/*
* For the case where reduced-hardware-only code is being generated,
* we know that only the extended sleep registers are available
*/
status = sleep_functions->extended_function(sleep_state);
return (status);
#endif /* !ACPI_REDUCED_HARDWARE */
}
/*******************************************************************************
*
* FUNCTION: acpi_enter_sleep_state_prep
*
* PARAMETERS: sleep_state - Which sleep state to enter
*
* RETURN: Status
*
* DESCRIPTION: Prepare to enter a system sleep state.
* 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;
u32 sst_value;
ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
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);
}
/* Execute the _PTS method (Prepare To Sleep) */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = sleep_state;
status =
acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
return_ACPI_STATUS(status);
}
/* Setup the argument to the _SST method (System STatus) */
switch (sleep_state) {
case ACPI_STATE_S0:
sst_value = ACPI_SST_WORKING;
break;
case ACPI_STATE_S1:
case ACPI_STATE_S2:
case ACPI_STATE_S3:
sst_value = ACPI_SST_SLEEPING;
break;
case ACPI_STATE_S4:
sst_value = ACPI_SST_SLEEP_CONTEXT;
break;
default:
sst_value = ACPI_SST_INDICATOR_OFF; /* Default is off */
break;
}
/*
* Set the system indicators to show the desired sleep state.
* _SST is an optional method (return no error if not found)
*/
acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
return_ACPI_STATUS(AE_OK);
}
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)
{
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=0x%X B=0x%X",
acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
}
status =
acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
/*******************************************************************************
*
* FUNCTION: acpi_leave_sleep_state_prep
*
* PARAMETERS: sleep_state - Which sleep state we are exiting
* flags - ACPI_EXECUTE_BFS to run optional method
*
* 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)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
status =
acpi_hw_sleep_dispatch(sleep_state,
ACPI_WAKE_PREP_FUNCTION_ID);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
/*******************************************************************************
*
* FUNCTION: acpi_leave_sleep_state
*
* PARAMETERS: sleep_state - Which sleep state we are exiting
*
* RETURN: Status
*
* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
* Called with interrupts ENABLED.
*
******************************************************************************/
acpi_status acpi_leave_sleep_state(u8 sleep_state)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)
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