2 /******************************************************************************
4 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2011, Intel Corp.
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
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17 * without modification.
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19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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42 * POSSIBILITY OF SUCH DAMAGES.
45 #include <acpi/acpi.h>
48 #include <linux/tboot.h>
49 #include <linux/module.h>
51 #define _COMPONENT ACPI_HARDWARE
52 ACPI_MODULE_NAME("hwsleep")
54 /*******************************************************************************
56 * FUNCTION: acpi_set_firmware_waking_vector
58 * PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
63 * DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS
65 ******************************************************************************/
67 acpi_set_firmware_waking_vector(u32 physical_address
)
69 ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector
);
73 * According to the ACPI specification 2.0c and later, the 64-bit
74 * waking vector should be cleared and the 32-bit waking vector should
75 * be used, unless we want the wake-up code to be called by the BIOS in
76 * Protected Mode. Some systems (for example HP dv5-1004nr) are known
77 * to fail to resume if the 64-bit vector is used.
80 /* Set the 32-bit vector */
82 acpi_gbl_FACS
->firmware_waking_vector
= physical_address
;
84 /* Clear the 64-bit vector if it exists */
86 if ((acpi_gbl_FACS
->length
> 32) && (acpi_gbl_FACS
->version
>= 1)) {
87 acpi_gbl_FACS
->xfirmware_waking_vector
= 0;
90 return_ACPI_STATUS(AE_OK
);
93 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector
)
95 #if ACPI_MACHINE_WIDTH == 64
96 /*******************************************************************************
98 * FUNCTION: acpi_set_firmware_waking_vector64
100 * PARAMETERS: physical_address - 64-bit physical address of ACPI protected
105 * DESCRIPTION: Sets the 64-bit X_firmware_waking_vector field of the FACS, if
106 * it exists in the table. This function is intended for use with
107 * 64-bit host operating systems.
109 ******************************************************************************/
111 acpi_set_firmware_waking_vector64(u64 physical_address
)
113 ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector64
);
116 /* Determine if the 64-bit vector actually exists */
118 if ((acpi_gbl_FACS
->length
<= 32) || (acpi_gbl_FACS
->version
< 1)) {
119 return_ACPI_STATUS(AE_NOT_EXIST
);
122 /* Clear 32-bit vector, set the 64-bit X_ vector */
124 acpi_gbl_FACS
->firmware_waking_vector
= 0;
125 acpi_gbl_FACS
->xfirmware_waking_vector
= physical_address
;
127 return_ACPI_STATUS(AE_OK
);
130 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64
)
133 /*******************************************************************************
135 * FUNCTION: acpi_enter_sleep_state_prep
137 * PARAMETERS: sleep_state - Which sleep state to enter
141 * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
142 * This function must execute with interrupts enabled.
143 * We break sleeping into 2 stages so that OSPM can handle
144 * various OS-specific tasks between the two steps.
146 ******************************************************************************/
147 acpi_status
acpi_enter_sleep_state_prep(u8 sleep_state
)
150 struct acpi_object_list arg_list
;
151 union acpi_object arg
;
153 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep
);
155 /* _PSW methods could be run here to enable wake-on keyboard, LAN, etc. */
157 status
= acpi_get_sleep_type_data(sleep_state
,
158 &acpi_gbl_sleep_type_a
,
159 &acpi_gbl_sleep_type_b
);
160 if (ACPI_FAILURE(status
)) {
161 return_ACPI_STATUS(status
);
164 /* Setup parameter object */
167 arg_list
.pointer
= &arg
;
169 arg
.type
= ACPI_TYPE_INTEGER
;
170 arg
.integer
.value
= sleep_state
;
172 /* Run the _PTS method */
174 status
= acpi_evaluate_object(NULL
, METHOD_NAME__PTS
, &arg_list
, NULL
);
175 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
176 return_ACPI_STATUS(status
);
179 /* Setup the argument to _SST */
181 switch (sleep_state
) {
183 arg
.integer
.value
= ACPI_SST_WORKING
;
189 arg
.integer
.value
= ACPI_SST_SLEEPING
;
193 arg
.integer
.value
= ACPI_SST_SLEEP_CONTEXT
;
197 arg
.integer
.value
= ACPI_SST_INDICATOR_OFF
; /* Default is off */
202 * Set the system indicators to show the desired sleep state.
203 * _SST is an optional method (return no error if not found)
205 status
= acpi_evaluate_object(NULL
, METHOD_NAME__SST
, &arg_list
, NULL
);
206 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
207 ACPI_EXCEPTION((AE_INFO
, status
,
208 "While executing method _SST"));
211 return_ACPI_STATUS(AE_OK
);
214 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep
)
216 static unsigned int gts
, bfs
;
217 module_param(gts
, uint
, 0644);
218 module_param(bfs
, uint
, 0644);
219 MODULE_PARM_DESC(gts
, "Enable evaluation of _GTS on suspend.");
220 MODULE_PARM_DESC(bfs
, "Enable evaluation of _BFS on resume".);
222 /*******************************************************************************
224 * FUNCTION: acpi_enter_sleep_state
226 * PARAMETERS: sleep_state - Which sleep state to enter
230 * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
231 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
233 ******************************************************************************/
234 acpi_status asmlinkage
acpi_enter_sleep_state(u8 sleep_state
)
238 struct acpi_bit_register_info
*sleep_type_reg_info
;
239 struct acpi_bit_register_info
*sleep_enable_reg_info
;
241 struct acpi_object_list arg_list
;
242 union acpi_object arg
;
245 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state
);
247 if ((acpi_gbl_sleep_type_a
> ACPI_SLEEP_TYPE_MAX
) ||
248 (acpi_gbl_sleep_type_b
> ACPI_SLEEP_TYPE_MAX
)) {
249 ACPI_ERROR((AE_INFO
, "Sleep values out of range: A=0x%X B=0x%X",
250 acpi_gbl_sleep_type_a
, acpi_gbl_sleep_type_b
));
251 return_ACPI_STATUS(AE_AML_OPERAND_VALUE
);
254 sleep_type_reg_info
=
255 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE
);
256 sleep_enable_reg_info
=
257 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE
);
259 /* Clear wake status */
262 acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS
, ACPI_CLEAR_STATUS
);
263 if (ACPI_FAILURE(status
)) {
264 return_ACPI_STATUS(status
);
267 /* Clear all fixed and general purpose status bits */
269 status
= acpi_hw_clear_acpi_status();
270 if (ACPI_FAILURE(status
)) {
271 return_ACPI_STATUS(status
);
275 * 1) Disable/Clear all GPEs
276 * 2) Enable all wakeup GPEs
278 status
= acpi_hw_disable_all_gpes();
279 if (ACPI_FAILURE(status
)) {
280 return_ACPI_STATUS(status
);
282 acpi_gbl_system_awake_and_running
= FALSE
;
284 status
= acpi_hw_enable_all_wakeup_gpes();
285 if (ACPI_FAILURE(status
)) {
286 return_ACPI_STATUS(status
);
290 /* Execute the _GTS method */
293 arg_list
.pointer
= &arg
;
294 arg
.type
= ACPI_TYPE_INTEGER
;
295 arg
.integer
.value
= sleep_state
;
297 status
= acpi_evaluate_object(NULL
, METHOD_NAME__GTS
, &arg_list
, NULL
);
298 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
299 return_ACPI_STATUS(status
);
303 /* Get current value of PM1A control */
305 status
= acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL
,
307 if (ACPI_FAILURE(status
)) {
308 return_ACPI_STATUS(status
);
310 ACPI_DEBUG_PRINT((ACPI_DB_INIT
,
311 "Entering sleep state [S%u]\n", sleep_state
));
313 /* Clear the SLP_EN and SLP_TYP fields */
315 pm1a_control
&= ~(sleep_type_reg_info
->access_bit_mask
|
316 sleep_enable_reg_info
->access_bit_mask
);
317 pm1b_control
= pm1a_control
;
319 /* Insert the SLP_TYP bits */
322 (acpi_gbl_sleep_type_a
<< sleep_type_reg_info
->bit_position
);
324 (acpi_gbl_sleep_type_b
<< sleep_type_reg_info
->bit_position
);
327 * We split the writes of SLP_TYP and SLP_EN to workaround
328 * poorly implemented hardware.
331 /* Write #1: write the SLP_TYP data to the PM1 Control registers */
333 status
= acpi_hw_write_pm1_control(pm1a_control
, pm1b_control
);
334 if (ACPI_FAILURE(status
)) {
335 return_ACPI_STATUS(status
);
338 /* Insert the sleep enable (SLP_EN) bit */
340 pm1a_control
|= sleep_enable_reg_info
->access_bit_mask
;
341 pm1b_control
|= sleep_enable_reg_info
->access_bit_mask
;
343 /* Flush caches, as per ACPI specification */
345 ACPI_FLUSH_CPU_CACHE();
347 tboot_sleep(sleep_state
, pm1a_control
, pm1b_control
);
349 /* Write #2: Write both SLP_TYP + SLP_EN */
351 status
= acpi_hw_write_pm1_control(pm1a_control
, pm1b_control
);
352 if (ACPI_FAILURE(status
)) {
353 return_ACPI_STATUS(status
);
356 if (sleep_state
> ACPI_STATE_S3
) {
358 * We wanted to sleep > S3, but it didn't happen (by virtue of the
359 * fact that we are still executing!)
361 * Wait ten seconds, then try again. This is to get S4/S5 to work on
364 * We wait so long to allow chipsets that poll this reg very slowly
365 * to still read the right value. Ideally, this block would go
368 acpi_os_stall(10000000);
370 status
= acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL
,
371 sleep_enable_reg_info
->
373 if (ACPI_FAILURE(status
)) {
374 return_ACPI_STATUS(status
);
378 /* Wait until we enter sleep state */
381 status
= acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS
,
383 if (ACPI_FAILURE(status
)) {
384 return_ACPI_STATUS(status
);
387 /* Spin until we wake */
391 return_ACPI_STATUS(AE_OK
);
394 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state
)
396 /*******************************************************************************
398 * FUNCTION: acpi_enter_sleep_state_s4bios
404 * DESCRIPTION: Perform a S4 bios request.
405 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
407 ******************************************************************************/
408 acpi_status asmlinkage
acpi_enter_sleep_state_s4bios(void)
413 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios
);
415 /* Clear the wake status bit (PM1) */
418 acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS
, ACPI_CLEAR_STATUS
);
419 if (ACPI_FAILURE(status
)) {
420 return_ACPI_STATUS(status
);
423 status
= acpi_hw_clear_acpi_status();
424 if (ACPI_FAILURE(status
)) {
425 return_ACPI_STATUS(status
);
429 * 1) Disable/Clear all GPEs
430 * 2) Enable all wakeup GPEs
432 status
= acpi_hw_disable_all_gpes();
433 if (ACPI_FAILURE(status
)) {
434 return_ACPI_STATUS(status
);
436 acpi_gbl_system_awake_and_running
= FALSE
;
438 status
= acpi_hw_enable_all_wakeup_gpes();
439 if (ACPI_FAILURE(status
)) {
440 return_ACPI_STATUS(status
);
443 ACPI_FLUSH_CPU_CACHE();
445 status
= acpi_hw_write_port(acpi_gbl_FADT
.smi_command
,
446 (u32
) acpi_gbl_FADT
.S4bios_request
, 8);
451 acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS
, &in_value
);
452 if (ACPI_FAILURE(status
)) {
453 return_ACPI_STATUS(status
);
457 return_ACPI_STATUS(AE_OK
);
460 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios
)
462 /*******************************************************************************
464 * FUNCTION: acpi_leave_sleep_state_prep
466 * PARAMETERS: sleep_state - Which sleep state we are exiting
470 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
472 * Called with interrupts DISABLED.
474 ******************************************************************************/
475 acpi_status
acpi_leave_sleep_state_prep(u8 sleep_state
)
477 struct acpi_object_list arg_list
;
478 union acpi_object arg
;
480 struct acpi_bit_register_info
*sleep_type_reg_info
;
481 struct acpi_bit_register_info
*sleep_enable_reg_info
;
485 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep
);
488 * Set SLP_TYPE and SLP_EN to state S0.
489 * This is unclear from the ACPI Spec, but it is required
492 status
= acpi_get_sleep_type_data(ACPI_STATE_S0
,
493 &acpi_gbl_sleep_type_a
,
494 &acpi_gbl_sleep_type_b
);
495 if (ACPI_SUCCESS(status
)) {
496 sleep_type_reg_info
=
497 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE
);
498 sleep_enable_reg_info
=
499 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE
);
501 /* Get current value of PM1A control */
503 status
= acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL
,
505 if (ACPI_SUCCESS(status
)) {
507 /* Clear the SLP_EN and SLP_TYP fields */
509 pm1a_control
&= ~(sleep_type_reg_info
->access_bit_mask
|
510 sleep_enable_reg_info
->
512 pm1b_control
= pm1a_control
;
514 /* Insert the SLP_TYP bits */
516 pm1a_control
|= (acpi_gbl_sleep_type_a
<<
517 sleep_type_reg_info
->bit_position
);
518 pm1b_control
|= (acpi_gbl_sleep_type_b
<<
519 sleep_type_reg_info
->bit_position
);
521 /* Write the control registers and ignore any errors */
523 (void)acpi_hw_write_pm1_control(pm1a_control
,
529 /* Execute the _BFS method */
532 arg_list
.pointer
= &arg
;
533 arg
.type
= ACPI_TYPE_INTEGER
;
534 arg
.integer
.value
= sleep_state
;
536 status
= acpi_evaluate_object(NULL
, METHOD_NAME__BFS
, &arg_list
, NULL
);
537 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
538 ACPI_EXCEPTION((AE_INFO
, status
, "During Method _BFS"));
541 return_ACPI_STATUS(status
);
544 /*******************************************************************************
546 * FUNCTION: acpi_leave_sleep_state
548 * PARAMETERS: sleep_state - Which sleep state we just exited
552 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
553 * Called with interrupts ENABLED.
555 ******************************************************************************/
556 acpi_status
acpi_leave_sleep_state(u8 sleep_state
)
558 struct acpi_object_list arg_list
;
559 union acpi_object arg
;
562 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state
);
564 /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
566 acpi_gbl_sleep_type_a
= ACPI_SLEEP_TYPE_INVALID
;
568 /* Setup parameter object */
571 arg_list
.pointer
= &arg
;
572 arg
.type
= ACPI_TYPE_INTEGER
;
574 /* Ignore any errors from these methods */
576 arg
.integer
.value
= ACPI_SST_WAKING
;
577 status
= acpi_evaluate_object(NULL
, METHOD_NAME__SST
, &arg_list
, NULL
);
578 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
579 ACPI_EXCEPTION((AE_INFO
, status
, "During Method _SST"));
583 * GPEs must be enabled before _WAK is called as GPEs
584 * might get fired there
587 * 1) Disable/Clear all GPEs
588 * 2) Enable all runtime GPEs
590 status
= acpi_hw_disable_all_gpes();
591 if (ACPI_FAILURE(status
)) {
592 return_ACPI_STATUS(status
);
594 status
= acpi_hw_enable_all_runtime_gpes();
595 if (ACPI_FAILURE(status
)) {
596 return_ACPI_STATUS(status
);
599 arg
.integer
.value
= sleep_state
;
600 status
= acpi_evaluate_object(NULL
, METHOD_NAME__WAK
, &arg_list
, NULL
);
601 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
602 ACPI_EXCEPTION((AE_INFO
, status
, "During Method _WAK"));
604 /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
607 * Some BIOSes assume that WAK_STS will be cleared on resume and use
608 * it to determine whether the system is rebooting or resuming. Clear
609 * it for compatibility.
611 acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS
, 1);
613 acpi_gbl_system_awake_and_running
= TRUE
;
615 /* Enable power button */
618 acpi_write_bit_register(acpi_gbl_fixed_event_info
619 [ACPI_EVENT_POWER_BUTTON
].
620 enable_register_id
, ACPI_ENABLE_EVENT
);
623 acpi_write_bit_register(acpi_gbl_fixed_event_info
624 [ACPI_EVENT_POWER_BUTTON
].
625 status_register_id
, ACPI_CLEAR_STATUS
);
627 arg
.integer
.value
= ACPI_SST_WORKING
;
628 status
= acpi_evaluate_object(NULL
, METHOD_NAME__SST
, &arg_list
, NULL
);
629 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
630 ACPI_EXCEPTION((AE_INFO
, status
, "During Method _SST"));
633 return_ACPI_STATUS(status
);
636 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state
)