?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Use dentry_path() to create full path to inode object
[pohmelfs.git] / drivers / acpi / acpica / hwsleep.c
blob3c4a922a9fc2810b607e47ffd3d799277ffcea5e
1
2 /******************************************************************************
3 *
4 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2012, Intel Corp.
10 * All rights reserved.
11 *
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.
26 *
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.
30 *
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.
43 */
44
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "actables.h"
48 #include <linux/tboot.h>
49 #include <linux/module.h>
50
51 #define _COMPONENT ACPI_HARDWARE
52 ACPI_MODULE_NAME("hwsleep")
53
54 /*******************************************************************************
55 *
56 * FUNCTION: acpi_set_firmware_waking_vector
57 *
58 * PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
59 * entry point.
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS
64 *
65 ******************************************************************************/
66 acpi_status
67 acpi_set_firmware_waking_vector(u32 physical_address)
68 {
69 ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
70
71
72 /*
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.
78 */
79
80 /* Set the 32-bit vector */
81
82 acpi_gbl_FACS->firmware_waking_vector = physical_address;
83
84 /* Clear the 64-bit vector if it exists */
85
86 if ((acpi_gbl_FACS->length > 32) && (acpi_gbl_FACS->version >= 1)) {
87 acpi_gbl_FACS->xfirmware_waking_vector = 0;
88 }
89
90 return_ACPI_STATUS(AE_OK);
91 }
92
93 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
94
95 #if ACPI_MACHINE_WIDTH == 64
96 /*******************************************************************************
97 *
98 * FUNCTION: acpi_set_firmware_waking_vector64
99 *
100 * PARAMETERS: physical_address - 64-bit physical address of ACPI protected
101 * mode entry point.
102 *
103 * RETURN: Status
104 *
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.
108 *
109 ******************************************************************************/
110 acpi_status
111 acpi_set_firmware_waking_vector64(u64 physical_address)
112 {
113 ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector64);
114
115
116 /* Determine if the 64-bit vector actually exists */
117
118 if ((acpi_gbl_FACS->length <= 32) || (acpi_gbl_FACS->version < 1)) {
119 return_ACPI_STATUS(AE_NOT_EXIST);
120 }
121
122 /* Clear 32-bit vector, set the 64-bit X_ vector */
123
124 acpi_gbl_FACS->firmware_waking_vector = 0;
125 acpi_gbl_FACS->xfirmware_waking_vector = physical_address;
126
127 return_ACPI_STATUS(AE_OK);
128 }
129
130 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64)
131 #endif
132
133 /*******************************************************************************
134 *
135 * FUNCTION: acpi_enter_sleep_state_prep
136 *
137 * PARAMETERS: sleep_state - Which sleep state to enter
138 *
139 * RETURN: Status
140 *
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.
145 *
146 ******************************************************************************/
147 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
148 {
149 acpi_status status;
150 struct acpi_object_list arg_list;
151 union acpi_object arg;
152
153 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
154
155 /* _PSW methods could be run here to enable wake-on keyboard, LAN, etc. */
156
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);
162 }
163
164 /* Setup parameter object */
165
166 arg_list.count = 1;
167 arg_list.pointer = &arg;
168
169 arg.type = ACPI_TYPE_INTEGER;
170 arg.integer.value = sleep_state;
171
172 /* Run the _PTS method */
173
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);
177 }
178
179 /* Setup the argument to _SST */
180
181 switch (sleep_state) {
182 case ACPI_STATE_S0:
183 arg.integer.value = ACPI_SST_WORKING;
184 break;
185
186 case ACPI_STATE_S1:
187 case ACPI_STATE_S2:
188 case ACPI_STATE_S3:
189 arg.integer.value = ACPI_SST_SLEEPING;
190 break;
191
192 case ACPI_STATE_S4:
193 arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
194 break;
195
196 default:
197 arg.integer.value = ACPI_SST_INDICATOR_OFF; /* Default is off */
198 break;
199 }
200
201 /*
202 * Set the system indicators to show the desired sleep state.
203 * _SST is an optional method (return no error if not found)
204 */
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"));
209 }
210
211 return_ACPI_STATUS(AE_OK);
212 }
213
214 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
215
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".);
221
222 /*******************************************************************************
223 *
224 * FUNCTION: acpi_enter_sleep_state
225 *
226 * PARAMETERS: sleep_state - Which sleep state to enter
227 *
228 * RETURN: Status
229 *
230 * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
231 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
232 *
233 ******************************************************************************/
234 acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
235 {
236 u32 pm1a_control;
237 u32 pm1b_control;
238 struct acpi_bit_register_info *sleep_type_reg_info;
239 struct acpi_bit_register_info *sleep_enable_reg_info;
240 u32 in_value;
241 struct acpi_object_list arg_list;
242 union acpi_object arg;
243 acpi_status status;
244
245 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
246
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);
252 }
253
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);
258
259 /* Clear wake status */
260
261 status =
262 acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
263 if (ACPI_FAILURE(status)) {
264 return_ACPI_STATUS(status);
265 }
266
267 /* Clear all fixed and general purpose status bits */
268
269 status = acpi_hw_clear_acpi_status();
270 if (ACPI_FAILURE(status)) {
271 return_ACPI_STATUS(status);
272 }
273
274 /*
275 * 1) Disable/Clear all GPEs
276 * 2) Enable all wakeup GPEs
277 */
278 status = acpi_hw_disable_all_gpes();
279 if (ACPI_FAILURE(status)) {
280 return_ACPI_STATUS(status);
281 }
282 acpi_gbl_system_awake_and_running = FALSE;
283
284 status = acpi_hw_enable_all_wakeup_gpes();
285 if (ACPI_FAILURE(status)) {
286 return_ACPI_STATUS(status);
287 }
288
289 if (gts) {
290 /* Execute the _GTS method */
291
292 arg_list.count = 1;
293 arg_list.pointer = &arg;
294 arg.type = ACPI_TYPE_INTEGER;
295 arg.integer.value = sleep_state;
296
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);
300 }
301 }
302
303 /* Get current value of PM1A control */
304
305 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
306 &pm1a_control);
307 if (ACPI_FAILURE(status)) {
308 return_ACPI_STATUS(status);
309 }
310 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
311 "Entering sleep state [S%u]\n", sleep_state));
312
313 /* Clear the SLP_EN and SLP_TYP fields */
314
315 pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
316 sleep_enable_reg_info->access_bit_mask);
317 pm1b_control = pm1a_control;
318
319 /* Insert the SLP_TYP bits */
320
321 pm1a_control |=
322 (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
323 pm1b_control |=
324 (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
325
326 /*
327 * We split the writes of SLP_TYP and SLP_EN to workaround
328 * poorly implemented hardware.
329 */
330
331 /* Write #1: write the SLP_TYP data to the PM1 Control registers */
332
333 status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
334 if (ACPI_FAILURE(status)) {
335 return_ACPI_STATUS(status);
336 }
337
338 /* Insert the sleep enable (SLP_EN) bit */
339
340 pm1a_control |= sleep_enable_reg_info->access_bit_mask;
341 pm1b_control |= sleep_enable_reg_info->access_bit_mask;
342
343 /* Flush caches, as per ACPI specification */
344
345 ACPI_FLUSH_CPU_CACHE();
346
347 tboot_sleep(sleep_state, pm1a_control, pm1b_control);
348
349 /* Write #2: Write both SLP_TYP + SLP_EN */
350
351 status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
352 if (ACPI_FAILURE(status)) {
353 return_ACPI_STATUS(status);
354 }
355
356 if (sleep_state > ACPI_STATE_S3) {
357 /*
358 * We wanted to sleep > S3, but it didn't happen (by virtue of the
359 * fact that we are still executing!)
360 *
361 * Wait ten seconds, then try again. This is to get S4/S5 to work on
362 * all machines.
363 *
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
366 * away entirely.
367 */
368 acpi_os_stall(10000000);
369
370 status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
371 sleep_enable_reg_info->
372 access_bit_mask);
373 if (ACPI_FAILURE(status)) {
374 return_ACPI_STATUS(status);
375 }
376 }
377
378 /* Wait until we enter sleep state */
379
380 do {
381 status = acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS,
382 &in_value);
383 if (ACPI_FAILURE(status)) {
384 return_ACPI_STATUS(status);
385 }
386
387 /* Spin until we wake */
388
389 } while (!in_value);
390
391 return_ACPI_STATUS(AE_OK);
392 }
393
394 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
395
396 /*******************************************************************************
397 *
398 * FUNCTION: acpi_enter_sleep_state_s4bios
399 *
400 * PARAMETERS: None
401 *
402 * RETURN: Status
403 *
404 * DESCRIPTION: Perform a S4 bios request.
405 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
406 *
407 ******************************************************************************/
408 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
409 {
410 u32 in_value;
411 acpi_status status;
412
413 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
414
415 /* Clear the wake status bit (PM1) */
416
417 status =
418 acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
419 if (ACPI_FAILURE(status)) {
420 return_ACPI_STATUS(status);
421 }
422
423 status = acpi_hw_clear_acpi_status();
424 if (ACPI_FAILURE(status)) {
425 return_ACPI_STATUS(status);
426 }
427
428 /*
429 * 1) Disable/Clear all GPEs
430 * 2) Enable all wakeup GPEs
431 */
432 status = acpi_hw_disable_all_gpes();
433 if (ACPI_FAILURE(status)) {
434 return_ACPI_STATUS(status);
435 }
436 acpi_gbl_system_awake_and_running = FALSE;
437
438 status = acpi_hw_enable_all_wakeup_gpes();
439 if (ACPI_FAILURE(status)) {
440 return_ACPI_STATUS(status);
441 }
442
443 ACPI_FLUSH_CPU_CACHE();
444
445 status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
446 (u32) acpi_gbl_FADT.S4bios_request, 8);
447
448 do {
449 acpi_os_stall(1000);
450 status =
451 acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
452 if (ACPI_FAILURE(status)) {
453 return_ACPI_STATUS(status);
454 }
455 } while (!in_value);
456
457 return_ACPI_STATUS(AE_OK);
458 }
459
460 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
461
462 /*******************************************************************************
463 *
464 * FUNCTION: acpi_leave_sleep_state_prep
465 *
466 * PARAMETERS: sleep_state - Which sleep state we are exiting
467 *
468 * RETURN: Status
469 *
470 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
471 * sleep.
472 * Called with interrupts DISABLED.
473 *
474 ******************************************************************************/
475 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
476 {
477 struct acpi_object_list arg_list;
478 union acpi_object arg;
479 acpi_status status;
480 struct acpi_bit_register_info *sleep_type_reg_info;
481 struct acpi_bit_register_info *sleep_enable_reg_info;
482 u32 pm1a_control;
483 u32 pm1b_control;
484
485 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
486
487 /*
488 * Set SLP_TYPE and SLP_EN to state S0.
489 * This is unclear from the ACPI Spec, but it is required
490 * by some machines.
491 */
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);
500
501 /* Get current value of PM1A control */
502
503 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
504 &pm1a_control);
505 if (ACPI_SUCCESS(status)) {
506
507 /* Clear the SLP_EN and SLP_TYP fields */
508
509 pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
510 sleep_enable_reg_info->
511 access_bit_mask);
512 pm1b_control = pm1a_control;
513
514 /* Insert the SLP_TYP bits */
515
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);
520
521 /* Write the control registers and ignore any errors */
522
523 (void)acpi_hw_write_pm1_control(pm1a_control,
524 pm1b_control);
525 }
526 }
527
528 if (bfs) {
529 /* Execute the _BFS method */
530
531 arg_list.count = 1;
532 arg_list.pointer = &arg;
533 arg.type = ACPI_TYPE_INTEGER;
534 arg.integer.value = sleep_state;
535
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"));
539 }
540 }
541 return_ACPI_STATUS(status);
542 }
543
544 /*******************************************************************************
545 *
546 * FUNCTION: acpi_leave_sleep_state
547 *
548 * PARAMETERS: sleep_state - Which sleep state we just exited
549 *
550 * RETURN: Status
551 *
552 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
553 * Called with interrupts ENABLED.
554 *
555 ******************************************************************************/
556 acpi_status acpi_leave_sleep_state(u8 sleep_state)
557 {
558 struct acpi_object_list arg_list;
559 union acpi_object arg;
560 acpi_status status;
561
562 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
563
564 /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
565
566 acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
567
568 /* Setup parameter object */
569
570 arg_list.count = 1;
571 arg_list.pointer = &arg;
572 arg.type = ACPI_TYPE_INTEGER;
573
574 /* Ignore any errors from these methods */
575
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"));
580 }
581
582 /*
583 * GPEs must be enabled before _WAK is called as GPEs
584 * might get fired there
585 *
586 * Restore the GPEs:
587 * 1) Disable/Clear all GPEs
588 * 2) Enable all runtime GPEs
589 */
590 status = acpi_hw_disable_all_gpes();
591 if (ACPI_FAILURE(status)) {
592 return_ACPI_STATUS(status);
593 }
594 status = acpi_hw_enable_all_runtime_gpes();
595 if (ACPI_FAILURE(status)) {
596 return_ACPI_STATUS(status);
597 }
598
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"));
603 }
604 /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
605
606 /*
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.
610 */
611 acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, 1);
612
613 acpi_gbl_system_awake_and_running = TRUE;
614
615 /* Enable power button */
616
617 (void)
618 acpi_write_bit_register(acpi_gbl_fixed_event_info
619 [ACPI_EVENT_POWER_BUTTON].
620 enable_register_id, ACPI_ENABLE_EVENT);
621
622 (void)
623 acpi_write_bit_register(acpi_gbl_fixed_event_info
624 [ACPI_EVENT_POWER_BUTTON].
625 status_register_id, ACPI_CLEAR_STATUS);
626
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"));
631 }
632
633 return_ACPI_STATUS(status);
634 }
635
636 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)