ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / drivers / acpi / hardware / hwsleep.c
blobd9937e05ec6a237d0eff801091dca208eaadcb3c
2 /******************************************************************************
4 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
6 *****************************************************************************/
8 /*
9 * Copyright (C) 2000 - 2008, 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
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
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.
31 * NO WARRANTY
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
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
45 #include <acpi/acpi.h>
46 #include <acpi/actables.h>
48 #define _COMPONENT ACPI_HARDWARE
49 ACPI_MODULE_NAME("hwsleep")
51 /*******************************************************************************
53 * FUNCTION: acpi_set_firmware_waking_vector
55 * PARAMETERS: physical_address - Physical address of ACPI real mode
56 * entry point.
58 * RETURN: Status
60 * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
62 ******************************************************************************/
63 acpi_status
64 acpi_set_firmware_waking_vector(acpi_physical_address physical_address)
66 struct acpi_table_facs *facs;
67 acpi_status status;
69 ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
71 /* Get the FACS */
73 status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
74 ACPI_CAST_INDIRECT_PTR(struct
75 acpi_table_header,
76 &facs));
77 if (ACPI_FAILURE(status)) {
78 return_ACPI_STATUS(status);
81 /* Set the vector */
83 if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
85 * ACPI 1.0 FACS or short table or optional X_ field is zero
87 facs->firmware_waking_vector = (u32) physical_address;
88 } else {
90 * ACPI 2.0 FACS with valid X_ field
92 facs->xfirmware_waking_vector = physical_address;
95 return_ACPI_STATUS(AE_OK);
98 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
100 /*******************************************************************************
102 * FUNCTION: acpi_get_firmware_waking_vector
104 * PARAMETERS: *physical_address - Where the contents of
105 * the firmware_waking_vector field of
106 * the FACS will be returned.
108 * RETURN: Status, vector
110 * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
112 ******************************************************************************/
113 #ifdef ACPI_FUTURE_USAGE
114 acpi_status
115 acpi_get_firmware_waking_vector(acpi_physical_address * physical_address)
117 struct acpi_table_facs *facs;
118 acpi_status status;
120 ACPI_FUNCTION_TRACE(acpi_get_firmware_waking_vector);
122 if (!physical_address) {
123 return_ACPI_STATUS(AE_BAD_PARAMETER);
126 /* Get the FACS */
128 status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
129 ACPI_CAST_INDIRECT_PTR(struct
130 acpi_table_header,
131 &facs));
132 if (ACPI_FAILURE(status)) {
133 return_ACPI_STATUS(status);
136 /* Get the vector */
138 if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
140 * ACPI 1.0 FACS or short table or optional X_ field is zero
142 *physical_address =
143 (acpi_physical_address) facs->firmware_waking_vector;
144 } else {
146 * ACPI 2.0 FACS with valid X_ field
148 *physical_address =
149 (acpi_physical_address) facs->xfirmware_waking_vector;
152 return_ACPI_STATUS(AE_OK);
155 ACPI_EXPORT_SYMBOL(acpi_get_firmware_waking_vector)
156 #endif
157 /*******************************************************************************
159 * FUNCTION: acpi_enter_sleep_state_prep
161 * PARAMETERS: sleep_state - Which sleep state to enter
163 * RETURN: Status
165 * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
166 * This function must execute with interrupts enabled.
167 * We break sleeping into 2 stages so that OSPM can handle
168 * various OS-specific tasks between the two steps.
170 ******************************************************************************/
171 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
173 acpi_status status;
174 struct acpi_object_list arg_list;
175 union acpi_object arg;
177 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
180 * _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
182 status = acpi_get_sleep_type_data(sleep_state,
183 &acpi_gbl_sleep_type_a,
184 &acpi_gbl_sleep_type_b);
185 if (ACPI_FAILURE(status)) {
186 return_ACPI_STATUS(status);
189 /* Setup parameter object */
191 arg_list.count = 1;
192 arg_list.pointer = &arg;
194 arg.type = ACPI_TYPE_INTEGER;
195 arg.integer.value = sleep_state;
197 /* Run the _PTS method */
199 status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
200 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
201 return_ACPI_STATUS(status);
204 /* Setup the argument to _SST */
206 switch (sleep_state) {
207 case ACPI_STATE_S0:
208 arg.integer.value = ACPI_SST_WORKING;
209 break;
211 case ACPI_STATE_S1:
212 case ACPI_STATE_S2:
213 case ACPI_STATE_S3:
214 arg.integer.value = ACPI_SST_SLEEPING;
215 break;
217 case ACPI_STATE_S4:
218 arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
219 break;
221 default:
222 arg.integer.value = ACPI_SST_INDICATOR_OFF; /* Default is off */
223 break;
226 /* Set the system indicators to show the desired sleep state. */
228 status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
229 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
230 ACPI_EXCEPTION((AE_INFO, status,
231 "While executing method _SST"));
234 return_ACPI_STATUS(status);
237 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
239 /*******************************************************************************
241 * FUNCTION: acpi_enter_sleep_state
243 * PARAMETERS: sleep_state - Which sleep state to enter
245 * RETURN: Status
247 * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
248 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
250 ******************************************************************************/
251 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
253 u32 PM1Acontrol;
254 u32 PM1Bcontrol;
255 struct acpi_bit_register_info *sleep_type_reg_info;
256 struct acpi_bit_register_info *sleep_enable_reg_info;
257 u32 in_value;
258 struct acpi_object_list arg_list;
259 union acpi_object arg;
260 acpi_status status;
262 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
264 if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
265 (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
266 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
267 acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
268 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
271 sleep_type_reg_info =
272 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
273 sleep_enable_reg_info =
274 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
276 /* Clear wake status */
278 status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
279 if (ACPI_FAILURE(status)) {
280 return_ACPI_STATUS(status);
283 /* Clear all fixed and general purpose status bits */
285 status = acpi_hw_clear_acpi_status();
286 if (ACPI_FAILURE(status)) {
287 return_ACPI_STATUS(status);
291 * 1) Disable/Clear all GPEs
292 * 2) Enable all wakeup GPEs
294 status = acpi_hw_disable_all_gpes();
295 if (ACPI_FAILURE(status)) {
296 return_ACPI_STATUS(status);
298 acpi_gbl_system_awake_and_running = FALSE;
300 status = acpi_hw_enable_all_wakeup_gpes();
301 if (ACPI_FAILURE(status)) {
302 return_ACPI_STATUS(status);
305 /* Execute the _GTS method */
307 arg_list.count = 1;
308 arg_list.pointer = &arg;
309 arg.type = ACPI_TYPE_INTEGER;
310 arg.integer.value = sleep_state;
312 status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
313 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
314 return_ACPI_STATUS(status);
317 /* Get current value of PM1A control */
319 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
320 if (ACPI_FAILURE(status)) {
321 return_ACPI_STATUS(status);
323 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
324 "Entering sleep state [S%d]\n", sleep_state));
326 /* Clear SLP_EN and SLP_TYP fields */
328 PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
329 sleep_enable_reg_info->access_bit_mask);
330 PM1Bcontrol = PM1Acontrol;
332 /* Insert SLP_TYP bits */
334 PM1Acontrol |=
335 (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
336 PM1Bcontrol |=
337 (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
340 * We split the writes of SLP_TYP and SLP_EN to workaround
341 * poorly implemented hardware.
344 /* Write #1: fill in SLP_TYP data */
346 status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
347 PM1Acontrol);
348 if (ACPI_FAILURE(status)) {
349 return_ACPI_STATUS(status);
352 status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
353 PM1Bcontrol);
354 if (ACPI_FAILURE(status)) {
355 return_ACPI_STATUS(status);
358 /* Insert SLP_ENABLE bit */
360 PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
361 PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
363 /* Write #2: SLP_TYP + SLP_EN */
365 ACPI_FLUSH_CPU_CACHE();
367 status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
368 PM1Acontrol);
369 if (ACPI_FAILURE(status)) {
370 return_ACPI_STATUS(status);
373 status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
374 PM1Bcontrol);
375 if (ACPI_FAILURE(status)) {
376 return_ACPI_STATUS(status);
379 if (sleep_state > ACPI_STATE_S3) {
381 * We wanted to sleep > S3, but it didn't happen (by virtue of the
382 * fact that we are still executing!)
384 * Wait ten seconds, then try again. This is to get S4/S5 to work on
385 * all machines.
387 * We wait so long to allow chipsets that poll this reg very slowly to
388 * still read the right value. Ideally, this block would go
389 * away entirely.
391 acpi_os_stall(10000000);
393 status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
394 sleep_enable_reg_info->
395 access_bit_mask);
396 if (ACPI_FAILURE(status)) {
397 return_ACPI_STATUS(status);
401 /* Wait until we enter sleep state */
403 do {
404 status = acpi_get_register_unlocked(ACPI_BITREG_WAKE_STATUS,
405 &in_value);
406 if (ACPI_FAILURE(status)) {
407 return_ACPI_STATUS(status);
410 /* Spin until we wake */
412 } while (!in_value);
414 return_ACPI_STATUS(AE_OK);
417 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
419 /*******************************************************************************
421 * FUNCTION: acpi_enter_sleep_state_s4bios
423 * PARAMETERS: None
425 * RETURN: Status
427 * DESCRIPTION: Perform a S4 bios request.
428 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
430 ******************************************************************************/
431 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
433 u32 in_value;
434 acpi_status status;
436 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
438 status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
439 if (ACPI_FAILURE(status)) {
440 return_ACPI_STATUS(status);
443 status = acpi_hw_clear_acpi_status();
444 if (ACPI_FAILURE(status)) {
445 return_ACPI_STATUS(status);
449 * 1) Disable/Clear all GPEs
450 * 2) Enable all wakeup GPEs
452 status = acpi_hw_disable_all_gpes();
453 if (ACPI_FAILURE(status)) {
454 return_ACPI_STATUS(status);
456 acpi_gbl_system_awake_and_running = FALSE;
458 status = acpi_hw_enable_all_wakeup_gpes();
459 if (ACPI_FAILURE(status)) {
460 return_ACPI_STATUS(status);
463 ACPI_FLUSH_CPU_CACHE();
465 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
466 (u32) acpi_gbl_FADT.S4bios_request, 8);
468 do {
469 acpi_os_stall(1000);
470 status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
471 if (ACPI_FAILURE(status)) {
472 return_ACPI_STATUS(status);
474 } while (!in_value);
476 return_ACPI_STATUS(AE_OK);
479 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
481 /*******************************************************************************
483 * FUNCTION: acpi_leave_sleep_state_prep
485 * PARAMETERS: sleep_state - Which sleep state we are exiting
487 * RETURN: Status
489 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
490 * sleep.
491 * Called with interrupts DISABLED.
493 ******************************************************************************/
494 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
496 struct acpi_object_list arg_list;
497 union acpi_object arg;
498 acpi_status status;
499 struct acpi_bit_register_info *sleep_type_reg_info;
500 struct acpi_bit_register_info *sleep_enable_reg_info;
501 u32 PM1Acontrol;
502 u32 PM1Bcontrol;
504 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
507 * Set SLP_TYPE and SLP_EN to state S0.
508 * This is unclear from the ACPI Spec, but it is required
509 * by some machines.
511 status = acpi_get_sleep_type_data(ACPI_STATE_S0,
512 &acpi_gbl_sleep_type_a,
513 &acpi_gbl_sleep_type_b);
514 if (ACPI_SUCCESS(status)) {
515 sleep_type_reg_info =
516 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
517 sleep_enable_reg_info =
518 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
520 /* Get current value of PM1A control */
522 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
523 &PM1Acontrol);
524 if (ACPI_SUCCESS(status)) {
526 /* Clear SLP_EN and SLP_TYP fields */
528 PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
529 sleep_enable_reg_info->
530 access_bit_mask);
531 PM1Bcontrol = PM1Acontrol;
533 /* Insert SLP_TYP bits */
535 PM1Acontrol |=
536 (acpi_gbl_sleep_type_a << sleep_type_reg_info->
537 bit_position);
538 PM1Bcontrol |=
539 (acpi_gbl_sleep_type_b << sleep_type_reg_info->
540 bit_position);
542 /* Just ignore any errors */
544 (void)acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
545 PM1Acontrol);
546 (void)acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
547 PM1Bcontrol);
551 /* Execute the _BFS method */
553 arg_list.count = 1;
554 arg_list.pointer = &arg;
555 arg.type = ACPI_TYPE_INTEGER;
556 arg.integer.value = sleep_state;
558 status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
559 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
560 ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
563 return_ACPI_STATUS(status);
566 /*******************************************************************************
568 * FUNCTION: acpi_leave_sleep_state
570 * PARAMETERS: sleep_state - Which sleep state we just exited
572 * RETURN: Status
574 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
575 * Called with interrupts ENABLED.
577 ******************************************************************************/
578 acpi_status acpi_leave_sleep_state(u8 sleep_state)
580 struct acpi_object_list arg_list;
581 union acpi_object arg;
582 acpi_status status;
584 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
586 /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
588 acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
590 /* Setup parameter object */
592 arg_list.count = 1;
593 arg_list.pointer = &arg;
594 arg.type = ACPI_TYPE_INTEGER;
596 /* Ignore any errors from these methods */
598 arg.integer.value = ACPI_SST_WAKING;
599 status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
600 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
601 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
605 * GPEs must be enabled before _WAK is called as GPEs
606 * might get fired there
608 * Restore the GPEs:
609 * 1) Disable/Clear all GPEs
610 * 2) Enable all runtime GPEs
612 status = acpi_hw_disable_all_gpes();
613 if (ACPI_FAILURE(status)) {
614 return_ACPI_STATUS(status);
616 status = acpi_hw_enable_all_runtime_gpes();
617 if (ACPI_FAILURE(status)) {
618 return_ACPI_STATUS(status);
621 arg.integer.value = sleep_state;
622 status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
623 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
624 ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
626 /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
628 acpi_gbl_system_awake_and_running = TRUE;
630 /* Enable power button */
632 (void)
633 acpi_set_register(acpi_gbl_fixed_event_info
634 [ACPI_EVENT_POWER_BUTTON].enable_register_id, 1);
636 (void)
637 acpi_set_register(acpi_gbl_fixed_event_info
638 [ACPI_EVENT_POWER_BUTTON].status_register_id, 1);
640 arg.integer.value = ACPI_SST_WORKING;
641 status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
642 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
643 ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
646 return_ACPI_STATUS(status);
649 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)