?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / acpi / hardware / hwregs.c
blob1d371fa663f2492a23bb3ae7d4aa0585c80ba7c6
1
2 /*******************************************************************************
3 *
4 * Module Name: hwregs - Read/write access functions for the various ACPI
5 * control and status registers.
6 *
7 ******************************************************************************/
8
9 /*
10 * Copyright (C) 2000 - 2007, R. Byron Moore
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions, and the following disclaimer,
18 * without modification.
19 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
20 * substantially similar to the "NO WARRANTY" disclaimer below
21 * ("Disclaimer") and any redistribution must be conditioned upon
22 * including a substantially similar Disclaimer requirement for further
23 * binary redistribution.
24 * 3. Neither the names of the above-listed copyright holders nor the names
25 * of any contributors may be used to endorse or promote products derived
26 * from this software without specific prior written permission.
27 *
28 * Alternatively, this software may be distributed under the terms of the
29 * GNU General Public License ("GPL") version 2 as published by the Free
30 * Software Foundation.
31 *
32 * NO WARRANTY
33 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
34 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
35 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
36 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
37 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
42 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
43 * POSSIBILITY OF SUCH DAMAGES.
44 */
45
46 #include <acpi/acpi.h>
47 #include <acpi/acnamesp.h>
48 #include <acpi/acevents.h>
49
50 #define _COMPONENT ACPI_HARDWARE
51 ACPI_MODULE_NAME("hwregs")
52
53 /*******************************************************************************
54 *
55 * FUNCTION: acpi_hw_clear_acpi_status
56 *
57 * PARAMETERS: None
58 *
59 * RETURN: None
60 *
61 * DESCRIPTION: Clears all fixed and general purpose status bits
62 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
63 *
64 ******************************************************************************/
65 acpi_status acpi_hw_clear_acpi_status(void)
66 {
67 acpi_status status;
68 acpi_cpu_flags lock_flags = 0;
69
70 ACPI_FUNCTION_TRACE(hw_clear_acpi_status);
71
72 ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %04X\n",
73 ACPI_BITMASK_ALL_FIXED_STATUS,
74 (u16) acpi_gbl_FADT.xpm1a_event_block.address));
75
76 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
77
78 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
79 ACPI_REGISTER_PM1_STATUS,
80 ACPI_BITMASK_ALL_FIXED_STATUS);
81 if (ACPI_FAILURE(status)) {
82 goto unlock_and_exit;
83 }
84
85 /* Clear the fixed events */
86
87 if (acpi_gbl_FADT.xpm1b_event_block.address) {
88 status =
89 acpi_hw_low_level_write(16, ACPI_BITMASK_ALL_FIXED_STATUS,
90 &acpi_gbl_FADT.xpm1b_event_block);
91 if (ACPI_FAILURE(status)) {
92 goto unlock_and_exit;
93 }
94 }
95
96 /* Clear the GPE Bits in all GPE registers in all GPE blocks */
97
98 status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
99
100 unlock_and_exit:
101 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
102 return_ACPI_STATUS(status);
103 }
104
105 /*******************************************************************************
106 *
107 * FUNCTION: acpi_get_sleep_type_data
108 *
109 * PARAMETERS: sleep_state - Numeric sleep state
110 * *sleep_type_a - Where SLP_TYPa is returned
111 * *sleep_type_b - Where SLP_TYPb is returned
112 *
113 * RETURN: Status - ACPI status
114 *
115 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
116 * state.
117 *
118 ******************************************************************************/
119
120 acpi_status
121 acpi_get_sleep_type_data(u8 sleep_state, u8 * sleep_type_a, u8 * sleep_type_b)
122 {
123 acpi_status status = AE_OK;
124 struct acpi_evaluate_info *info;
125
126 ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
127
128 /* Validate parameters */
129
130 if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
131 return_ACPI_STATUS(AE_BAD_PARAMETER);
132 }
133
134 /* Allocate the evaluation information block */
135
136 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
137 if (!info) {
138 return_ACPI_STATUS(AE_NO_MEMORY);
139 }
140
141 info->pathname =
142 ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
143
144 /* Evaluate the namespace object containing the values for this state */
145
146 status = acpi_ns_evaluate(info);
147 if (ACPI_FAILURE(status)) {
148 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
149 "%s while evaluating SleepState [%s]\n",
150 acpi_format_exception(status),
151 info->pathname));
152
153 goto cleanup;
154 }
155
156 /* Must have a return object */
157
158 if (!info->return_object) {
159 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
160 info->pathname));
161 status = AE_NOT_EXIST;
162 }
163
164 /* It must be of type Package */
165
166 else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) {
167 ACPI_ERROR((AE_INFO,
168 "Sleep State return object is not a Package"));
169 status = AE_AML_OPERAND_TYPE;
170 }
171
172 /*
173 * The package must have at least two elements. NOTE (March 2005): This
174 * goes against the current ACPI spec which defines this object as a
175 * package with one encoded DWORD element. However, existing practice
176 * by BIOS vendors seems to be to have 2 or more elements, at least
177 * one per sleep type (A/B).
178 */
179 else if (info->return_object->package.count < 2) {
180 ACPI_ERROR((AE_INFO,
181 "Sleep State return package does not have at least two elements"));
182 status = AE_AML_NO_OPERAND;
183 }
184
185 /* The first two elements must both be of type Integer */
186
187 else if ((ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[0])
188 != ACPI_TYPE_INTEGER) ||
189 (ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[1])
190 != ACPI_TYPE_INTEGER)) {
191 ACPI_ERROR((AE_INFO,
192 "Sleep State return package elements are not both Integers (%s, %s)",
193 acpi_ut_get_object_type_name(info->return_object->
194 package.elements[0]),
195 acpi_ut_get_object_type_name(info->return_object->
196 package.elements[1])));
197 status = AE_AML_OPERAND_TYPE;
198 } else {
199 /* Valid _Sx_ package size, type, and value */
200
201 *sleep_type_a = (u8)
202 (info->return_object->package.elements[0])->integer.value;
203 *sleep_type_b = (u8)
204 (info->return_object->package.elements[1])->integer.value;
205 }
206
207 if (ACPI_FAILURE(status)) {
208 ACPI_EXCEPTION((AE_INFO, status,
209 "While evaluating SleepState [%s], bad Sleep object %p type %s",
210 info->pathname, info->return_object,
211 acpi_ut_get_object_type_name(info->
212 return_object)));
213 }
214
215 acpi_ut_remove_reference(info->return_object);
216
217 cleanup:
218 ACPI_FREE(info);
219 return_ACPI_STATUS(status);
220 }
221
222 ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)
223
224 /*******************************************************************************
225 *
226 * FUNCTION: acpi_hw_get_register_bit_mask
227 *
228 * PARAMETERS: register_id - Index of ACPI Register to access
229 *
230 * RETURN: The bitmask to be used when accessing the register
231 *
232 * DESCRIPTION: Map register_id into a register bitmask.
233 *
234 ******************************************************************************/
235 struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id)
236 {
237 ACPI_FUNCTION_ENTRY();
238
239 if (register_id > ACPI_BITREG_MAX) {
240 ACPI_ERROR((AE_INFO, "Invalid BitRegister ID: %X",
241 register_id));
242 return (NULL);
243 }
244
245 return (&acpi_gbl_bit_register_info[register_id]);
246 }
247
248 /*******************************************************************************
249 *
250 * FUNCTION: acpi_get_register
251 *
252 * PARAMETERS: register_id - ID of ACPI bit_register to access
253 * return_value - Value that was read from the register
254 *
255 * RETURN: Status and the value read from specified Register. Value
256 * returned is normalized to bit0 (is shifted all the way right)
257 *
258 * DESCRIPTION: ACPI bit_register read function.
259 *
260 ******************************************************************************/
261
262 acpi_status acpi_get_register(u32 register_id, u32 * return_value)
263 {
264 u32 register_value = 0;
265 struct acpi_bit_register_info *bit_reg_info;
266 acpi_status status;
267
268 ACPI_FUNCTION_TRACE(acpi_get_register);
269
270 /* Get the info structure corresponding to the requested ACPI Register */
271
272 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
273 if (!bit_reg_info) {
274 return_ACPI_STATUS(AE_BAD_PARAMETER);
275 }
276
277 /* Read from the register */
278
279 status = acpi_hw_register_read(ACPI_MTX_LOCK,
280 bit_reg_info->parent_register,
281 &register_value);
282
283 if (ACPI_SUCCESS(status)) {
284
285 /* Normalize the value that was read */
286
287 register_value =
288 ((register_value & bit_reg_info->access_bit_mask)
289 >> bit_reg_info->bit_position);
290
291 *return_value = register_value;
292
293 ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n",
294 register_value,
295 bit_reg_info->parent_register));
296 }
297
298 return_ACPI_STATUS(status);
299 }
300
301 ACPI_EXPORT_SYMBOL(acpi_get_register)
302
303 /*******************************************************************************
304 *
305 * FUNCTION: acpi_set_register
306 *
307 * PARAMETERS: register_id - ID of ACPI bit_register to access
308 * Value - (only used on write) value to write to the
309 * Register, NOT pre-normalized to the bit pos
310 *
311 * RETURN: Status
312 *
313 * DESCRIPTION: ACPI Bit Register write function.
314 *
315 ******************************************************************************/
316 acpi_status acpi_set_register(u32 register_id, u32 value)
317 {
318 u32 register_value = 0;
319 struct acpi_bit_register_info *bit_reg_info;
320 acpi_status status;
321 acpi_cpu_flags lock_flags;
322
323 ACPI_FUNCTION_TRACE_U32(acpi_set_register, register_id);
324
325 /* Get the info structure corresponding to the requested ACPI Register */
326
327 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
328 if (!bit_reg_info) {
329 ACPI_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X",
330 register_id));
331 return_ACPI_STATUS(AE_BAD_PARAMETER);
332 }
333
334 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
335
336 /* Always do a register read first so we can insert the new bits */
337
338 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
339 bit_reg_info->parent_register,
340 &register_value);
341 if (ACPI_FAILURE(status)) {
342 goto unlock_and_exit;
343 }
344
345 /*
346 * Decode the Register ID
347 * Register ID = [Register block ID] | [bit ID]
348 *
349 * Check bit ID to fine locate Register offset.
350 * Check Mask to determine Register offset, and then read-write.
351 */
352 switch (bit_reg_info->parent_register) {
353 case ACPI_REGISTER_PM1_STATUS:
354
355 /*
356 * Status Registers are different from the rest. Clear by
357 * writing 1, and writing 0 has no effect. So, the only relevant
358 * information is the single bit we're interested in, all others should
359 * be written as 0 so they will be left unchanged.
360 */
361 value = ACPI_REGISTER_PREPARE_BITS(value,
362 bit_reg_info->bit_position,
363 bit_reg_info->
364 access_bit_mask);
365 if (value) {
366 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
367 ACPI_REGISTER_PM1_STATUS,
368 (u16) value);
369 register_value = 0;
370 }
371 break;
372
373 case ACPI_REGISTER_PM1_ENABLE:
374
375 ACPI_REGISTER_INSERT_VALUE(register_value,
376 bit_reg_info->bit_position,
377 bit_reg_info->access_bit_mask,
378 value);
379
380 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
381 ACPI_REGISTER_PM1_ENABLE,
382 (u16) register_value);
383 break;
384
385 case ACPI_REGISTER_PM1_CONTROL:
386
387 /*
388 * Write the PM1 Control register.
389 * Note that at this level, the fact that there are actually TWO
390 * registers (A and B - and B may not exist) is abstracted.
391 */
392 ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n",
393 register_value));
394
395 ACPI_REGISTER_INSERT_VALUE(register_value,
396 bit_reg_info->bit_position,
397 bit_reg_info->access_bit_mask,
398 value);
399
400 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
401 ACPI_REGISTER_PM1_CONTROL,
402 (u16) register_value);
403 break;
404
405 case ACPI_REGISTER_PM2_CONTROL:
406
407 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
408 ACPI_REGISTER_PM2_CONTROL,
409 &register_value);
410 if (ACPI_FAILURE(status)) {
411 goto unlock_and_exit;
412 }
413
414 ACPI_DEBUG_PRINT((ACPI_DB_IO,
415 "PM2 control: Read %X from %8.8X%8.8X\n",
416 register_value,
417 ACPI_FORMAT_UINT64(acpi_gbl_FADT.
418 xpm2_control_block.
419 address)));
420
421 ACPI_REGISTER_INSERT_VALUE(register_value,
422 bit_reg_info->bit_position,
423 bit_reg_info->access_bit_mask,
424 value);
425
426 ACPI_DEBUG_PRINT((ACPI_DB_IO,
427 "About to write %4.4X to %8.8X%8.8X\n",
428 register_value,
429 ACPI_FORMAT_UINT64(acpi_gbl_FADT.
430 xpm2_control_block.
431 address)));
432
433 status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
434 ACPI_REGISTER_PM2_CONTROL,
435 (u8) (register_value));
436 break;
437
438 default:
439 break;
440 }
441
442 unlock_and_exit:
443
444 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
445
446 /* Normalize the value that was read */
447
448 ACPI_DEBUG_EXEC(register_value =
449 ((register_value & bit_reg_info->access_bit_mask) >>
450 bit_reg_info->bit_position));
451
452 ACPI_DEBUG_PRINT((ACPI_DB_IO,
453 "Set bits: %8.8X actual %8.8X register %X\n", value,
454 register_value, bit_reg_info->parent_register));
455 return_ACPI_STATUS(status);
456 }
457
458 ACPI_EXPORT_SYMBOL(acpi_set_register)
459
460 /******************************************************************************
461 *
462 * FUNCTION: acpi_hw_register_read
463 *
464 * PARAMETERS: use_lock - Lock hardware? True/False
465 * register_id - ACPI Register ID
466 * return_value - Where the register value is returned
467 *
468 * RETURN: Status and the value read.
469 *
470 * DESCRIPTION: Read from the specified ACPI register
471 *
472 ******************************************************************************/
473 acpi_status
474 acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
475 {
476 u32 value1 = 0;
477 u32 value2 = 0;
478 acpi_status status;
479 acpi_cpu_flags lock_flags = 0;
480
481 ACPI_FUNCTION_TRACE(hw_register_read);
482
483 if (ACPI_MTX_LOCK == use_lock) {
484 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
485 }
486
487 switch (register_id) {
488 case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
489
490 status =
491 acpi_hw_low_level_read(16, &value1,
492 &acpi_gbl_FADT.xpm1a_event_block);
493 if (ACPI_FAILURE(status)) {
494 goto unlock_and_exit;
495 }
496
497 /* PM1B is optional */
498
499 status =
500 acpi_hw_low_level_read(16, &value2,
501 &acpi_gbl_FADT.xpm1b_event_block);
502 value1 |= value2;
503 break;
504
505 case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */
506
507 status =
508 acpi_hw_low_level_read(16, &value1, &acpi_gbl_xpm1a_enable);
509 if (ACPI_FAILURE(status)) {
510 goto unlock_and_exit;
511 }
512
513 /* PM1B is optional */
514
515 status =
516 acpi_hw_low_level_read(16, &value2, &acpi_gbl_xpm1b_enable);
517 value1 |= value2;
518 break;
519
520 case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
521
522 status =
523 acpi_hw_low_level_read(16, &value1,
524 &acpi_gbl_FADT.xpm1a_control_block);
525 if (ACPI_FAILURE(status)) {
526 goto unlock_and_exit;
527 }
528
529 status =
530 acpi_hw_low_level_read(16, &value2,
531 &acpi_gbl_FADT.xpm1b_control_block);
532 value1 |= value2;
533 break;
534
535 case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
536
537 status =
538 acpi_hw_low_level_read(8, &value1,
539 &acpi_gbl_FADT.xpm2_control_block);
540 break;
541
542 case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
543
544 status =
545 acpi_hw_low_level_read(32, &value1,
546 &acpi_gbl_FADT.xpm_timer_block);
547 break;
548
549 case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
550
551 status =
552 acpi_os_read_port(acpi_gbl_FADT.smi_command, &value1, 8);
553 break;
554
555 default:
556 ACPI_ERROR((AE_INFO, "Unknown Register ID: %X", register_id));
557 status = AE_BAD_PARAMETER;
558 break;
559 }
560
561 unlock_and_exit:
562 if (ACPI_MTX_LOCK == use_lock) {
563 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
564 }
565
566 if (ACPI_SUCCESS(status)) {
567 *return_value = value1;
568 }
569
570 return_ACPI_STATUS(status);
571 }
572
573 /******************************************************************************
574 *
575 * FUNCTION: acpi_hw_register_write
576 *
577 * PARAMETERS: use_lock - Lock hardware? True/False
578 * register_id - ACPI Register ID
579 * Value - The value to write
580 *
581 * RETURN: Status
582 *
583 * DESCRIPTION: Write to the specified ACPI register
584 *
585 * NOTE: In accordance with the ACPI specification, this function automatically
586 * preserves the value of the following bits, meaning that these bits cannot be
587 * changed via this interface:
588 *
589 * PM1_CONTROL[0] = SCI_EN
590 * PM1_CONTROL[9]
591 * PM1_STATUS[11]
592 *
593 * ACPI References:
594 * 1) Hardware Ignored Bits: When software writes to a register with ignored
595 * bit fields, it preserves the ignored bit fields
596 * 2) SCI_EN: OSPM always preserves this bit position
597 *
598 ******************************************************************************/
599
600 acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
601 {
602 acpi_status status;
603 acpi_cpu_flags lock_flags = 0;
604 u32 read_value;
605
606 ACPI_FUNCTION_TRACE(hw_register_write);
607
608 if (ACPI_MTX_LOCK == use_lock) {
609 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
610 }
611
612 switch (register_id) {
613 case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
614
615 /* Perform a read first to preserve certain bits (per ACPI spec) */
616
617 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
618 ACPI_REGISTER_PM1_STATUS,
619 &read_value);
620 if (ACPI_FAILURE(status)) {
621 goto unlock_and_exit;
622 }
623
624 /* Insert the bits to be preserved */
625
626 ACPI_INSERT_BITS(value, ACPI_PM1_STATUS_PRESERVED_BITS,
627 read_value);
628
629 /* Now we can write the data */
630
631 status =
632 acpi_hw_low_level_write(16, value,
633 &acpi_gbl_FADT.xpm1a_event_block);
634 if (ACPI_FAILURE(status)) {
635 goto unlock_and_exit;
636 }
637
638 /* PM1B is optional */
639
640 status =
641 acpi_hw_low_level_write(16, value,
642 &acpi_gbl_FADT.xpm1b_event_block);
643 break;
644
645 case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */
646
647 status =
648 acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1a_enable);
649 if (ACPI_FAILURE(status)) {
650 goto unlock_and_exit;
651 }
652
653 /* PM1B is optional */
654
655 status =
656 acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1b_enable);
657 break;
658
659 case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
660
661 /*
662 * Perform a read first to preserve certain bits (per ACPI spec)
663 */
664 status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
665 ACPI_REGISTER_PM1_CONTROL,
666 &read_value);
667 if (ACPI_FAILURE(status)) {
668 goto unlock_and_exit;
669 }
670
671 /* Insert the bits to be preserved */
672
673 ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS,
674 read_value);
675
676 /* Now we can write the data */
677
678 status =
679 acpi_hw_low_level_write(16, value,
680 &acpi_gbl_FADT.xpm1a_control_block);
681 if (ACPI_FAILURE(status)) {
682 goto unlock_and_exit;
683 }
684
685 status =
686 acpi_hw_low_level_write(16, value,
687 &acpi_gbl_FADT.xpm1b_control_block);
688 break;
689
690 case ACPI_REGISTER_PM1A_CONTROL: /* 16-bit access */
691
692 status =
693 acpi_hw_low_level_write(16, value,
694 &acpi_gbl_FADT.xpm1a_control_block);
695 break;
696
697 case ACPI_REGISTER_PM1B_CONTROL: /* 16-bit access */
698
699 status =
700 acpi_hw_low_level_write(16, value,
701 &acpi_gbl_FADT.xpm1b_control_block);
702 break;
703
704 case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
705
706 status =
707 acpi_hw_low_level_write(8, value,
708 &acpi_gbl_FADT.xpm2_control_block);
709 break;
710
711 case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
712
713 status =
714 acpi_hw_low_level_write(32, value,
715 &acpi_gbl_FADT.xpm_timer_block);
716 break;
717
718 case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
719
720 /* SMI_CMD is currently always in IO space */
721
722 status =
723 acpi_os_write_port(acpi_gbl_FADT.smi_command, value, 8);
724 break;
725
726 default:
727 status = AE_BAD_PARAMETER;
728 break;
729 }
730
731 unlock_and_exit:
732 if (ACPI_MTX_LOCK == use_lock) {
733 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
734 }
735
736 return_ACPI_STATUS(status);
737 }
738
739 /******************************************************************************
740 *
741 * FUNCTION: acpi_hw_low_level_read
742 *
743 * PARAMETERS: Width - 8, 16, or 32
744 * Value - Where the value is returned
745 * Reg - GAS register structure
746 *
747 * RETURN: Status
748 *
749 * DESCRIPTION: Read from either memory or IO space.
750 *
751 ******************************************************************************/
752
753 acpi_status
754 acpi_hw_low_level_read(u32 width, u32 * value, struct acpi_generic_address *reg)
755 {
756 u64 address;
757 acpi_status status;
758
759 ACPI_FUNCTION_NAME(hw_low_level_read);
760
761 /*
762 * Must have a valid pointer to a GAS structure, and
763 * a non-zero address within. However, don't return an error
764 * because the PM1A/B code must not fail if B isn't present.
765 */
766 if (!reg) {
767 return (AE_OK);
768 }
769
770 /* Get a local copy of the address. Handles possible alignment issues */
771
772 ACPI_MOVE_64_TO_64(&address, &reg->address);
773 if (!address) {
774 return (AE_OK);
775 }
776 *value = 0;
777
778 /*
779 * Two address spaces supported: Memory or IO.
780 * PCI_Config is not supported here because the GAS struct is insufficient
781 */
782 switch (reg->space_id) {
783 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
784
785 status = acpi_os_read_memory((acpi_physical_address) address,
786 value, width);
787 break;
788
789 case ACPI_ADR_SPACE_SYSTEM_IO:
790
791 status =
792 acpi_os_read_port((acpi_io_address) address, value, width);
793 break;
794
795 default:
796 ACPI_ERROR((AE_INFO,
797 "Unsupported address space: %X", reg->space_id));
798 return (AE_BAD_PARAMETER);
799 }
800
801 ACPI_DEBUG_PRINT((ACPI_DB_IO,
802 "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n",
803 *value, width, ACPI_FORMAT_UINT64(address),
804 acpi_ut_get_region_name(reg->space_id)));
805
806 return (status);
807 }
808
809 /******************************************************************************
810 *
811 * FUNCTION: acpi_hw_low_level_write
812 *
813 * PARAMETERS: Width - 8, 16, or 32
814 * Value - To be written
815 * Reg - GAS register structure
816 *
817 * RETURN: Status
818 *
819 * DESCRIPTION: Write to either memory or IO space.
820 *
821 ******************************************************************************/
822
823 acpi_status
824 acpi_hw_low_level_write(u32 width, u32 value, struct acpi_generic_address * reg)
825 {
826 u64 address;
827 acpi_status status;
828
829 ACPI_FUNCTION_NAME(hw_low_level_write);
830
831 /*
832 * Must have a valid pointer to a GAS structure, and
833 * a non-zero address within. However, don't return an error
834 * because the PM1A/B code must not fail if B isn't present.
835 */
836 if (!reg) {
837 return (AE_OK);
838 }
839
840 /* Get a local copy of the address. Handles possible alignment issues */
841
842 ACPI_MOVE_64_TO_64(&address, &reg->address);
843 if (!address) {
844 return (AE_OK);
845 }
846
847 /*
848 * Two address spaces supported: Memory or IO.
849 * PCI_Config is not supported here because the GAS struct is insufficient
850 */
851 switch (reg->space_id) {
852 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
853
854 status = acpi_os_write_memory((acpi_physical_address) address,
855 value, width);
856 break;
857
858 case ACPI_ADR_SPACE_SYSTEM_IO:
859
860 status = acpi_os_write_port((acpi_io_address) address, value,
861 width);
862 break;
863
864 default:
865 ACPI_ERROR((AE_INFO,
866 "Unsupported address space: %X", reg->space_id));
867 return (AE_BAD_PARAMETER);
868 }
869
870 ACPI_DEBUG_PRINT((ACPI_DB_IO,
871 "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n",
872 value, width, ACPI_FORMAT_UINT64(address),
873 acpi_ut_get_region_name(reg->space_id)));
874
875 return (status);
876 }
Mirror for ia64_pv_ops.git