Commit 2feec47d authored by Bob Moore's avatar Bob Moore Committed by Len Brown
Browse files

ACPICA: ACPI 5: Support for new FADT SleepStatus, SleepControl registers 



Adds sleep and wake support for systems with these registers.
One new file, hwxfsleep.c

Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 384fe875

drivers/acpi/acpica/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -73,7 +73,8 @@ acpi-y += \ 
	hwregs.o	\

	hwsleep.o	\

	hwvalid.o	\

	hwxface.o

	hwxface.o	\

	hwxfsleep.o



acpi-$(ACPI_FUTURE_USAGE) += hwtimer.o

drivers/acpi/acpica/achware.h

+17 −0
Original line number Diff line number Diff line
@@ -80,6 +80,23 @@ acpi_status acpi_hw_register_write(u32 register_id, u32 value); 


acpi_status acpi_hw_clear_acpi_status(void);



/*

 * hwsleep - sleep/wake support

 */

void acpi_hw_execute_SST(u32 value);



acpi_status acpi_hw_extended_sleep(u8 sleep_state);



acpi_status acpi_hw_legacy_sleep(u8 sleep_state);



acpi_status acpi_hw_extended_wake_prep(u8 sleep_state);



acpi_status acpi_hw_extended_wake(u8 sleep_state);



acpi_status acpi_hw_legacy_wake_prep(u8 sleep_state);



acpi_status acpi_hw_legacy_wake(u8 sleep_state);



/*

 * hwvalid - Port I/O with validation

 */

drivers/acpi/acpica/hwsleep.c

+298 −268
Original line number Diff line number Diff line 


/******************************************************************************

 *

 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface

 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support Functions

 *

 *****************************************************************************/
@@ -44,212 +43,183 @@ 


#include <acpi/acpi.h>

#include "accommon.h"

#include "actables.h"

#include <linux/tboot.h>

#include <linux/module.h>



#define _COMPONENT          ACPI_HARDWARE

ACPI_MODULE_NAME("hwsleep")



/* Local prototypes */

static void acpi_hw_execute_GTS(u8 sleep_state);



static void acpi_hw_execute_BFS(u8 sleep_state);



static void acpi_hw_execute_WAK(u8 sleep_state);



static unsigned int gts, bfs;

module_param(gts, uint, 0644);

module_param(bfs, uint, 0644);

MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");

MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);



/*******************************************************************************

 *

 * FUNCTION:    acpi_set_firmware_waking_vector

 * FUNCTION:    acpi_hw_execute_GTS

 *

 * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode

 *                                    entry point.

 * PARAMETERS:  sleep_state         - Sleep state that will be entered

 *

 * RETURN:      Status

 * RETURN:      None

 *

 * DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS

 * DESCRIPTION: Execute the optional _GTS method (Going To Sleep)

 *

 ******************************************************************************/

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.

	 */

static void acpi_hw_execute_GTS(u8 sleep_state)

{

	struct acpi_object_list arg_list;

	union acpi_object arg;

	acpi_status status;



	/* Set the 32-bit vector */

	if (!gts)

		return;



	acpi_gbl_FACS->firmware_waking_vector = physical_address;

	/* One argument, sleep_state */



	/* Clear the 64-bit vector if it exists */

	arg_list.count = 1;

	arg_list.pointer = &arg;

	arg.type = ACPI_TYPE_INTEGER;

	arg.integer.value = sleep_state;



	if ((acpi_gbl_FACS->length > 32) && (acpi_gbl_FACS->version >= 1)) {

		acpi_gbl_FACS->xfirmware_waking_vector = 0;

	status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);

	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {

		ACPI_EXCEPTION((AE_INFO, status,

				"While executing method _GTS"));

	}



	return_ACPI_STATUS(AE_OK);

}



ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)



#if ACPI_MACHINE_WIDTH == 64

/*******************************************************************************

 *

 * FUNCTION:    acpi_set_firmware_waking_vector64

 * FUNCTION:    acpi_hw_execute_BFS

 *

 * PARAMETERS:  physical_address    - 64-bit physical address of ACPI protected

 *                                    mode entry point.

 * PARAMETERS:  sleep_state         - Which sleep state we just exited

 *

 * RETURN:      Status

 * RETURN:      None

 *

 * 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.

 * DESCRIPTION: Execute the optional _BFS method (Back From Sleep)

 *

 ******************************************************************************/

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 */

static void acpi_hw_execute_BFS(u8 sleep_state)

{

	struct acpi_object_list arg_list;

	union acpi_object arg;

	acpi_status status;



	if ((acpi_gbl_FACS->length <= 32) || (acpi_gbl_FACS->version < 1)) {

		return_ACPI_STATUS(AE_NOT_EXIST);

	}

	if (!bfs)

		return;



	/* Clear 32-bit vector, set the 64-bit X_ vector */

	/* One argument, sleep_state */



	acpi_gbl_FACS->firmware_waking_vector = 0;

	acpi_gbl_FACS->xfirmware_waking_vector = physical_address;

	arg_list.count = 1;

	arg_list.pointer = &arg;

	arg.type = ACPI_TYPE_INTEGER;

	arg.integer.value = sleep_state;



	return_ACPI_STATUS(AE_OK);

	status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);

	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {

		ACPI_EXCEPTION((AE_INFO, status,

				"While executing method _BFS"));

	}

}



ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64)

#endif



/*******************************************************************************

 *

 * FUNCTION:    acpi_enter_sleep_state_prep

 * FUNCTION:    acpi_hw_execute_WAK

 *

 * PARAMETERS:  sleep_state         - Which sleep state to enter

 * PARAMETERS:  sleep_state         - Which sleep state we just exited

 *

 * RETURN:      Status

 * RETURN:      None

 *

 * 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.

 * DESCRIPTION: Execute the _WAK method (System Wake)

 *

 ******************************************************************************/

acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)



static void acpi_hw_execute_WAK(u8 sleep_state)

{

	acpi_status status;

	struct acpi_object_list arg_list;

	union acpi_object arg;

	acpi_status status;



	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 */

	/* One argument, sleep_state */



	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);

	status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);

	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {

		return_ACPI_STATUS(status);

		ACPI_EXCEPTION((AE_INFO, status,

				"While executing method _WAK"));

	}

	/* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */

}



	/* Setup the argument to _SST */



	switch (sleep_state) {

	case ACPI_STATE_S0:

		arg.integer.value = ACPI_SST_WORKING;

		break;

/*******************************************************************************

 *

 * FUNCTION:    acpi_hw_execute_SST

 *

 * PARAMETERS:  indicator_id        - Value to be passed to the _SST method

 *

 * RETURN:      None

 *

 * DESCRIPTION: Execute the optional _SST method (System Status)

 *

 ******************************************************************************/



	case ACPI_STATE_S1:

	case ACPI_STATE_S2:

	case ACPI_STATE_S3:

		arg.integer.value = ACPI_SST_SLEEPING;

		break;

void acpi_hw_execute_SST(u32 indicator_id)

{

	struct acpi_object_list arg_list;

	union acpi_object arg;

	acpi_status status;



	case ACPI_STATE_S4:

		arg.integer.value = ACPI_SST_SLEEP_CONTEXT;

		break;

	/* One argument, status indicator ID */



	default:

		arg.integer.value = ACPI_SST_INDICATOR_OFF;	/* Default is off */

		break;

	}

	arg_list.count = 1;

	arg_list.pointer = &arg;

	arg.type = ACPI_TYPE_INTEGER;



	/*

	 * Set the system indicators to show the desired sleep state.

	 * _SST is an optional method (return no error if not found)

	 */

	arg.integer.value = indicator_id;

	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(AE_OK);

}



ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)



static unsigned int gts, bfs;

module_param(gts, uint, 0644);

module_param(bfs, uint, 0644);

MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");

MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);



/*******************************************************************************

 *

 * FUNCTION:    acpi_enter_sleep_state

 * FUNCTION:    acpi_hw_legacy_sleep

 *

 * PARAMETERS:  sleep_state         - Which sleep state to enter

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)

 * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers

 *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED

 *

 ******************************************************************************/

acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)



acpi_status acpi_hw_legacy_sleep(u8 sleep_state)

{

	u32 pm1a_control;

	u32 pm1b_control;

	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;

	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=0x%X B=0x%X",

			    acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));

		return_ACPI_STATUS(AE_AML_OPERAND_VALUE);

	}

	ACPI_FUNCTION_TRACE(hw_legacy_sleep);



	sleep_type_reg_info =

	    acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
@@ -271,6 +241,18 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state) 
		return_ACPI_STATUS(status);

	}



	if (sleep_state != ACPI_STATE_S5) {

		/*

		 * Disable BM arbitration. This feature is contained within an

		 * optional register (PM2 Control), so ignore a BAD_ADDRESS

		 * exception.

		 */

		status = acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);

		if (ACPI_FAILURE(status) && (status != AE_BAD_ADDRESS)) {

			return_ACPI_STATUS(status);

		}

	}



	/*

	 * 1) Disable/Clear all GPEs

	 * 2) Enable all wakeup GPEs
@@ -286,19 +268,9 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state) 
		return_ACPI_STATUS(status);

	}



	if (gts) {

		/* Execute the _GTS method */



		arg_list.count = 1;

		arg_list.pointer = &arg;

		arg.type = ACPI_TYPE_INTEGER;

		arg.integer.value = sleep_state;

	/* Execute the _GTS method (Going To Sleep) */



		status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);

		if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {

			return_ACPI_STATUS(status);

		}

	}

	acpi_hw_execute_GTS(sleep_state);



	/* Get current value of PM1A control */
@@ -375,114 +347,43 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state) 
		}

	}



	/* Wait until we enter sleep state */



	do {

		status = acpi_read_bit_register(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);



	/* 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.S4bios_request, 8);

	/* Wait for transition back to Working State */



	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)



/*******************************************************************************

 *

 * FUNCTION:    acpi_leave_sleep_state_prep

 * FUNCTION:    acpi_hw_legacy_wake_prep

 *

 * PARAMETERS:  sleep_state         - Which sleep state we are exiting

 * 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 DISABLED.

 *              Called with interrupts ENABLED.

 *

 ******************************************************************************/

acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)



acpi_status acpi_hw_legacy_wake_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 pm1a_control;

	u32 pm1b_control;



	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);

	ACPI_FUNCTION_TRACE(hw_legacy_wake_prep);



	/*

	 * Set SLP_TYPE and SLP_EN to state S0.
@@ -525,25 +426,13 @@ acpi_status acpi_leave_sleep_state_prep(u8 sleep_state) 
		}

	}



	if (bfs) {

		/* 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"));

		}

	}

	acpi_hw_execute_BFS(sleep_state);

	return_ACPI_STATUS(status);

}



/*******************************************************************************

 *

 * FUNCTION:    acpi_leave_sleep_state

 * FUNCTION:    acpi_hw_legacy_wake

 *

 * PARAMETERS:  sleep_state         - Which sleep state we just exited

 *
@@ -553,31 +442,17 @@ acpi_status acpi_leave_sleep_state_prep(u8 sleep_state) 
 *              Called with interrupts ENABLED.

 *

 ******************************************************************************/

acpi_status acpi_leave_sleep_state(u8 sleep_state)



acpi_status acpi_hw_legacy_wake(u8 sleep_state)

{

	struct acpi_object_list arg_list;

	union acpi_object arg;

	acpi_status status;



	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);

	ACPI_FUNCTION_TRACE(hw_legacy_wake);



	/* 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"));

	}

	acpi_hw_execute_SST(ACPI_SST_WAKING);



	/*

	 * GPEs must be enabled before _WAK is called as GPEs
@@ -591,25 +466,24 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state) 
	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}



	status = acpi_hw_enable_all_runtime_gpes();

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}



	arg.integer.value = sleep_state;

	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? */

	/*

	 * Now we can execute _WAK, etc. Some machines require that the GPEs

	 * are enabled before the wake methods are executed.

	 */

	acpi_hw_execute_WAK(sleep_state);



	/*

	 * Some BIOSes assume that WAK_STS will be cleared on resume and use

	 * it to determine whether the system is rebooting or resuming. Clear

	 * it for compatibility.

	 * 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.

	 */

	acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, 1);



	acpi_gbl_system_awake_and_running = TRUE;



	/* Enable power button */
@@ -624,13 +498,169 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state) 
				    [ACPI_EVENT_POWER_BUTTON].

				    status_register_id, ACPI_CLEAR_STATUS);



	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"));

	/*

	 * Enable BM arbitration. This feature is contained within an

	 * optional register (PM2 Control), so ignore a BAD_ADDRESS

	 * exception.

	 */

	status = acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);

	if (ACPI_FAILURE(status) && (status != AE_BAD_ADDRESS)) {

		return_ACPI_STATUS(status);

	}



	acpi_hw_execute_SST(ACPI_SST_WORKING);

	return_ACPI_STATUS(status);

}



ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)
 


/*******************************************************************************

 *

 * FUNCTION:    acpi_hw_extended_sleep

 *

 * PARAMETERS:  sleep_state         - Which sleep state to enter

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Enter a system sleep state via the extended FADT sleep

 *              registers (V5 FADT).

 *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED

 *

 ******************************************************************************/



acpi_status acpi_hw_extended_sleep(u8 sleep_state)

{

	acpi_status status;

	u8 sleep_type_value;

	u64 sleep_status;



	ACPI_FUNCTION_TRACE(hw_extended_sleep);



	/* Extended sleep registers must be valid */



	if (!acpi_gbl_FADT.sleep_control.address ||

	    !acpi_gbl_FADT.sleep_status.address) {

		return_ACPI_STATUS(AE_NOT_EXIST);

	}



	/* Clear wake status (WAK_STS) */



	status = acpi_write(ACPI_X_WAKE_STATUS, &acpi_gbl_FADT.sleep_status);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}



	acpi_gbl_system_awake_and_running = FALSE;



	/* Execute the _GTS method (Going To Sleep) */



	acpi_hw_execute_GTS(sleep_state);



	/* Flush caches, as per ACPI specification */



	ACPI_FLUSH_CPU_CACHE();



	/*

	 * Set the SLP_TYP and SLP_EN bits.

	 *

	 * Note: We only use the first value returned by the \_Sx method

	 * (acpi_gbl_sleep_type_a) - As per ACPI specification.

	 */

	ACPI_DEBUG_PRINT((ACPI_DB_INIT,

			  "Entering sleep state [S%u]\n", sleep_state));



	sleep_type_value =

	    ((acpi_gbl_sleep_type_a << ACPI_X_SLEEP_TYPE_POSITION) &

	     ACPI_X_SLEEP_TYPE_MASK);



	status = acpi_write((sleep_type_value | ACPI_X_SLEEP_ENABLE),

			    &acpi_gbl_FADT.sleep_control);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}



	/* Wait for transition back to Working State */



	do {

		status = acpi_read(&sleep_status, &acpi_gbl_FADT.sleep_status);

		if (ACPI_FAILURE(status)) {

			return_ACPI_STATUS(status);

		}



	} while (!(((u8)sleep_status) & ACPI_X_WAKE_STATUS));



	return_ACPI_STATUS(AE_OK);

}



/*******************************************************************************

 *

 * FUNCTION:    acpi_hw_extended_wake_prep

 *

 * PARAMETERS:  sleep_state         - Which sleep state we just exited

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Perform first part of OS-independent ACPI cleanup after

 *              a sleep. Called with interrupts ENABLED.

 *

 ******************************************************************************/



acpi_status acpi_hw_extended_wake_prep(u8 sleep_state)

{

	acpi_status status;

	u8 sleep_type_value;



	ACPI_FUNCTION_TRACE(hw_extended_wake_prep);



	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_value =

		    ((acpi_gbl_sleep_type_a << ACPI_X_SLEEP_TYPE_POSITION) &

		     ACPI_X_SLEEP_TYPE_MASK);



		(void)acpi_write((sleep_type_value | ACPI_X_SLEEP_ENABLE),

				 &acpi_gbl_FADT.sleep_control);

	}



	acpi_hw_execute_BFS(sleep_state);

	return_ACPI_STATUS(AE_OK);

}



/*******************************************************************************

 *

 * FUNCTION:    acpi_hw_extended_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_extended_wake(u8 sleep_state)

{

	ACPI_FUNCTION_TRACE(hw_extended_wake);



	/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */



	acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;



	/* Execute the wake methods */



	acpi_hw_execute_SST(ACPI_SST_WAKING);

	acpi_hw_execute_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(ACPI_X_WAKE_STATUS, &acpi_gbl_FADT.sleep_status);

	acpi_gbl_system_awake_and_running = TRUE;



	acpi_hw_execute_SST(ACPI_SST_WORKING);

	return_ACPI_STATUS(AE_OK);

}