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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 

#include 

#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 */