[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / acpica / hwxfsleep.c

/******************************************************************************
 *
 * Name: hwxfsleep.c - ACPI Hardware Sleep/Wake External Interfaces
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2013, 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 <linux/export.h>
#include <acpi/acpi.h>
#include "accommon.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(ACPI_USEC_PER_MSEC);
		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 (FADT). Note: As per the ACPI
	 * specification, these extended registers are to be used for HW-reduced
	 * platforms only. They are not general-purpose replacements for the
	 * legacy PM register sleep support.
	 */
	if (acpi_gbl_reduced_hardware) {
		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
 *              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
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
 *              sleep. Called with interrupts DISABLED.
 *              We break wake/resume into 2 stages so that OSPM can handle
 *              various OS-specific tasks between the two steps.
 *
 ******************************************************************************/
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)
Commit	Line	Data
2feec47d BM	1	/******************************************************************************
	2	*
	3	* Name: hwxfsleep.c - ACPI Hardware Sleep/Wake External Interfaces
	4	*
	5	*****************************************************************************/
	6
	7	/*
25f044e6	8	* Copyright (C) 2000 - 2013, Intel Corp.
2feec47d BM	9	* All rights reserved.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions, and the following disclaimer,
	16	* without modification.
	17	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	18	* substantially similar to the "NO WARRANTY" disclaimer below
	19	* ("Disclaimer") and any redistribution must be conditioned upon
	20	* including a substantially similar Disclaimer requirement for further
	21	* binary redistribution.
	22	* 3. Neither the names of the above-listed copyright holders nor the names
	23	* of any contributors may be used to endorse or promote products derived
	24	* from this software without specific prior written permission.
	25	*
	26	* Alternatively, this software may be distributed under the terms of the
	27	* GNU General Public License ("GPL") version 2 as published by the Free
	28	* Software Foundation.
	29	*
	30	* NO WARRANTY
	31	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	32	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	33	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	34	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	35	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	36	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	37	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	38	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	39	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	40	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	41	* POSSIBILITY OF SUCH DAMAGES.
	42	*/
	43
739dcbb9	44	#include <linux/export.h>
2feec47d BM	45	#include <acpi/acpi.h>
2feec47d BM	46	#include "accommon.h"
2feec47d BM	47
	48	#define _COMPONENT ACPI_HARDWARE
	49	ACPI_MODULE_NAME("hwxfsleep")
	50
72a8887a	51	/* Local prototypes */
1f86e8c1	52	static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id);
72a8887a BM	53
	54	/*
	55	* Dispatch table used to efficiently branch to the various sleep
	56	* functions.
	57	*/
8a73b17e LM	58	#define ACPI_SLEEP_FUNCTION_ID 0
	59	#define ACPI_WAKE_PREP_FUNCTION_ID 1
	60	#define ACPI_WAKE_FUNCTION_ID 2
72a8887a BM	61
	62	/* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */
	63
	64	static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
	65	{ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep),
	66	acpi_hw_extended_sleep},
	67	{ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep),
	68	acpi_hw_extended_wake_prep},
	69	{ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake), acpi_hw_extended_wake}
	70	};
	71
	72	/*
	73	* These functions are removed for the ACPI_REDUCED_HARDWARE case:
	74	* acpi_set_firmware_waking_vector
	75	* acpi_set_firmware_waking_vector64
	76	* acpi_enter_sleep_state_s4bios
	77	*/
	78
33620c54	79	#if (!ACPI_REDUCED_HARDWARE)
2feec47d BM	80	/*******************************************************************************
	81	*
	82	* FUNCTION: acpi_set_firmware_waking_vector
	83	*
	84	* PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
	85	* entry point.
	86	*
	87	* RETURN: Status
	88	*
	89	* DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS
	90	*
	91	******************************************************************************/
72a8887a	92
2feec47d BM	93	acpi_status acpi_set_firmware_waking_vector(u32 physical_address)
	94	{
	95	ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
	96
	97
	98	/*
	99	* According to the ACPI specification 2.0c and later, the 64-bit
	100	* waking vector should be cleared and the 32-bit waking vector should
	101	* be used, unless we want the wake-up code to be called by the BIOS in
	102	* Protected Mode. Some systems (for example HP dv5-1004nr) are known
	103	* to fail to resume if the 64-bit vector is used.
	104	*/
	105
	106	/* Set the 32-bit vector */
	107
	108	acpi_gbl_FACS->firmware_waking_vector = physical_address;
	109
	110	/* Clear the 64-bit vector if it exists */
	111
	112	if ((acpi_gbl_FACS->length > 32) && (acpi_gbl_FACS->version >= 1)) {
	113	acpi_gbl_FACS->xfirmware_waking_vector = 0;
	114	}
	115
	116	return_ACPI_STATUS(AE_OK);
	117	}
	118
	119	ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
	120
	121	#if ACPI_MACHINE_WIDTH == 64
	122	/*******************************************************************************
	123	*
	124	* FUNCTION: acpi_set_firmware_waking_vector64
	125	*
	126	* PARAMETERS: physical_address - 64-bit physical address of ACPI protected
	127	* mode entry point.
	128	*
	129	* RETURN: Status
	130	*
	131	* DESCRIPTION: Sets the 64-bit X_firmware_waking_vector field of the FACS, if
	132	* it exists in the table. This function is intended for use with
	133	* 64-bit host operating systems.
	134	*
	135	******************************************************************************/
	136	acpi_status acpi_set_firmware_waking_vector64(u64 physical_address)
	137	{
	138	ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector64);
	139
	140
	141	/* Determine if the 64-bit vector actually exists */
	142
	143	if ((acpi_gbl_FACS->length <= 32) \|\| (acpi_gbl_FACS->version < 1)) {
	144	return_ACPI_STATUS(AE_NOT_EXIST);
	145	}
	146
	147	/* Clear 32-bit vector, set the 64-bit X_ vector */
	148
	149	acpi_gbl_FACS->firmware_waking_vector = 0;
	150	acpi_gbl_FACS->xfirmware_waking_vector = physical_address;
	151	return_ACPI_STATUS(AE_OK);
	152	}
	153
	154	ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64)
	155	#endif
	156
157	/*******************************************************************************
158	*
159	* FUNCTION: acpi_enter_sleep_state_s4bios
160	*
161	* PARAMETERS: None
162	*
163	* RETURN: Status
164	*
165	* DESCRIPTION: Perform a S4 bios request.
166	* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
167	*
168	******************************************************************************/
169	acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
170	{
171	u32 in_value;
172	acpi_status status;
173
174	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
175
176	/* Clear the wake status bit (PM1) */
177
178	status =
179	acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
180	if (ACPI_FAILURE(status)) {
181	return_ACPI_STATUS(status);
182	}
183
184	status = acpi_hw_clear_acpi_status();
185	if (ACPI_FAILURE(status)) {
186	return_ACPI_STATUS(status);
187	}
188
189	/*
190	* 1) Disable/Clear all GPEs
191	* 2) Enable all wakeup GPEs
192	*/
193	status = acpi_hw_disable_all_gpes();
194	if (ACPI_FAILURE(status)) {
195	return_ACPI_STATUS(status);
196	}
197	acpi_gbl_system_awake_and_running = FALSE;
198
199	status = acpi_hw_enable_all_wakeup_gpes();
200	if (ACPI_FAILURE(status)) {
201	return_ACPI_STATUS(status);
202	}
203
204	ACPI_FLUSH_CPU_CACHE();
205
206	status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
ba494bee	207	(u32)acpi_gbl_FADT.s4_bios_request, 8);
2feec47d BM	208
2feec47d BM	209	do {
c41679a4	210	acpi_os_stall(ACPI_USEC_PER_MSEC);
2feec47d BM	211	status =
	212	acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
	213	if (ACPI_FAILURE(status)) {
	214	return_ACPI_STATUS(status);
	215	}
	216	} while (!in_value);
	217
	218	return_ACPI_STATUS(AE_OK);
	219	}
	220
	221	ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
33620c54	222	#endif /* !ACPI_REDUCED_HARDWARE */
72a8887a BM	223	/*******************************************************************************
	224	*
	225	* FUNCTION: acpi_hw_sleep_dispatch
	226	*
	227	* PARAMETERS: sleep_state - Which sleep state to enter/exit
	228	* function_id - Sleep, wake_prep, or Wake
	229	*
	230	* RETURN: Status from the invoked sleep handling function.
	231	*
	232	* DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
	233	* function.
	234	*
	235	******************************************************************************/
1f86e8c1	236	static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
72a8887a BM	237	{
	238	acpi_status status;
	239	struct acpi_sleep_functions *sleep_functions =
	240	&acpi_sleep_dispatch[function_id];
	241
	242	#if (!ACPI_REDUCED_HARDWARE)
72a8887a BM	243	/*
72a8887a BM	244	* If the Hardware Reduced flag is set (from the FADT), we must
22a5fdfc LZ	245	* use the extended sleep registers (FADT). Note: As per the ACPI
	246	* specification, these extended registers are to be used for HW-reduced
	247	* platforms only. They are not general-purpose replacements for the
	248	* legacy PM register sleep support.
72a8887a	249	*/
22a5fdfc	250	if (acpi_gbl_reduced_hardware) {
3f6f49c7	251	status = sleep_functions->extended_function(sleep_state);
72a8887a BM	252	} else {
	253	/* Legacy sleep */
	254
3f6f49c7	255	status = sleep_functions->legacy_function(sleep_state);
72a8887a BM	256	}
	257
	258	return (status);
	259
	260	#else
	261	/*
	262	* For the case where reduced-hardware-only code is being generated,
	263	* we know that only the extended sleep registers are available
	264	*/
3f6f49c7	265	status = sleep_functions->extended_function(sleep_state);
72a8887a BM	266	return (status);
	267
	268	#endif /* !ACPI_REDUCED_HARDWARE */
	269	}
	270
2feec47d BM	271	/*******************************************************************************
	272	*
	273	* FUNCTION: acpi_enter_sleep_state_prep
	274	*
	275	* PARAMETERS: sleep_state - Which sleep state to enter
	276	*
	277	* RETURN: Status
	278	*
72a8887a	279	* DESCRIPTION: Prepare to enter a system sleep state.
2feec47d BM	280	* This function must execute with interrupts enabled.
	281	* We break sleeping into 2 stages so that OSPM can handle
	282	* various OS-specific tasks between the two steps.
	283	*
	284	******************************************************************************/
72a8887a	285
2feec47d BM	286	acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
	287	{
	288	acpi_status status;
	289	struct acpi_object_list arg_list;
	290	union acpi_object arg;
	291	u32 sst_value;
	292
	293	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
	294
2feec47d BM	295	status = acpi_get_sleep_type_data(sleep_state,
	296	&acpi_gbl_sleep_type_a,
	297	&acpi_gbl_sleep_type_b);
	298	if (ACPI_FAILURE(status)) {
	299	return_ACPI_STATUS(status);
	300	}
	301
	302	/* Execute the _PTS method (Prepare To Sleep) */
	303
	304	arg_list.count = 1;
	305	arg_list.pointer = &arg;
	306	arg.type = ACPI_TYPE_INTEGER;
	307	arg.integer.value = sleep_state;
	308
4efeeecd BM	309	status =
4efeeecd BM	310	acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
2feec47d BM	311	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
	312	return_ACPI_STATUS(status);
	313	}
	314
	315	/* Setup the argument to the _SST method (System STatus) */
	316
	317	switch (sleep_state) {
	318	case ACPI_STATE_S0:
	319	sst_value = ACPI_SST_WORKING;
	320	break;
	321
	322	case ACPI_STATE_S1:
	323	case ACPI_STATE_S2:
	324	case ACPI_STATE_S3:
	325	sst_value = ACPI_SST_SLEEPING;
	326	break;
	327
	328	case ACPI_STATE_S4:
	329	sst_value = ACPI_SST_SLEEP_CONTEXT;
	330	break;
	331
	332	default:
	333	sst_value = ACPI_SST_INDICATOR_OFF; /* Default is off */
	334	break;
	335	}
	336
	337	/*
	338	* Set the system indicators to show the desired sleep state.
	339	* _SST is an optional method (return no error if not found)
	340	*/
4efeeecd	341	acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
2feec47d BM	342	return_ACPI_STATUS(AE_OK);
	343	}
	344
	345	ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
	346
	347	/*******************************************************************************
	348	*
	349	* FUNCTION: acpi_enter_sleep_state
	350	*
	351	* PARAMETERS: sleep_state - Which sleep state to enter
	352	*
	353	* RETURN: Status
	354	*
75c8044f	355	* DESCRIPTION: Enter a system sleep state
2feec47d BM	356	* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
	357	*
	358	******************************************************************************/
3f6f49c7	359	acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
2feec47d BM	360	{
	361	acpi_status status;
	362
	363	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
	364
	365	if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) \|\|
	366	(acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
	367	ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
	368	acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
	369	return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
	370	}
33620c54	371
1f86e8c1	372	status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
2feec47d BM	373	return_ACPI_STATUS(status);
	374	}
	375
	376	ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
	377
	378	/*******************************************************************************
	379	*
	380	* FUNCTION: acpi_leave_sleep_state_prep
	381	*
	382	* PARAMETERS: sleep_state - Which sleep state we are exiting
	383	*
	384	* RETURN: Status
	385	*
	386	* DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
75c8044f LZ	387	* sleep. Called with interrupts DISABLED.
	388	* We break wake/resume into 2 stages so that OSPM can handle
	389	* various OS-specific tasks between the two steps.
2feec47d BM	390	*
2feec47d BM	391	******************************************************************************/
3f6f49c7	392	acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
2feec47d BM	393	{
	394	acpi_status status;
	395
72a8887a	396	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
2feec47d	397
8a73b17e	398	status =
1f86e8c1	399	acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID);
2feec47d BM	400	return_ACPI_STATUS(status);
	401	}
	402
	403	ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
	404
	405	/*******************************************************************************
	406	*
	407	* FUNCTION: acpi_leave_sleep_state
	408	*
72a8887a	409	* PARAMETERS: sleep_state - Which sleep state we are exiting
2feec47d BM	410	*
	411	* RETURN: Status
	412	*
	413	* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
	414	* Called with interrupts ENABLED.
	415	*
	416	******************************************************************************/
	417	acpi_status acpi_leave_sleep_state(u8 sleep_state)
	418	{
	419	acpi_status status;
	420
	421	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
	422
3f6f49c7	423	status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
2feec47d BM	424	return_ACPI_STATUS(status);
	425	}
	426
	427	ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)