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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 - 2005, 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 <linux/module.h>
47
48#include <acpi/acpi.h>
49#include <acpi/acnamesp.h>
50#include <acpi/acevents.h>
51
52#define _COMPONENT ACPI_HARDWARE
53 ACPI_MODULE_NAME ("hwregs")
54
55
56/*******************************************************************************
57 *
58 * FUNCTION: acpi_hw_clear_acpi_status
59 *
60 * PARAMETERS: Flags - Lock the hardware or not
61 *
62 * RETURN: none
63 *
64 * DESCRIPTION: Clears all fixed and general purpose status bits
65 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
66 *
67 ******************************************************************************/
68
69acpi_status
70acpi_hw_clear_acpi_status (
71 u32 flags)
72{
73 acpi_status status;
74
75
76 ACPI_FUNCTION_TRACE ("hw_clear_acpi_status");
77
78
79 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %04X to %04X\n",
80 ACPI_BITMASK_ALL_FIXED_STATUS,
81 (u16) acpi_gbl_FADT->xpm1a_evt_blk.address));
82
83 if (flags & ACPI_MTX_LOCK) {
84 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
85 if (ACPI_FAILURE (status)) {
86 return_ACPI_STATUS (status);
87 }
88 }
89
90 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_STATUS,
91 ACPI_BITMASK_ALL_FIXED_STATUS);
92 if (ACPI_FAILURE (status)) {
93 goto unlock_and_exit;
94 }
95
96 /* Clear the fixed events */
97
98 if (acpi_gbl_FADT->xpm1b_evt_blk.address) {
99 status = acpi_hw_low_level_write (16, ACPI_BITMASK_ALL_FIXED_STATUS,
100 &acpi_gbl_FADT->xpm1b_evt_blk);
101 if (ACPI_FAILURE (status)) {
102 goto unlock_and_exit;
103 }
104 }
105
106 /* Clear the GPE Bits in all GPE registers in all GPE blocks */
107
108 status = acpi_ev_walk_gpe_list (acpi_hw_clear_gpe_block, ACPI_ISR);
109
110unlock_and_exit:
111 if (flags & ACPI_MTX_LOCK) {
112 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
113 }
114 return_ACPI_STATUS (status);
115}
116
117
118/*******************************************************************************
119 *
120 * FUNCTION: acpi_get_sleep_type_data
121 *
122 * PARAMETERS: sleep_state - Numeric sleep state
123 * *sleep_type_a - Where SLP_TYPa is returned
124 * *sleep_type_b - Where SLP_TYPb is returned
125 *
126 * RETURN: Status - ACPI status
127 *
128 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
129 * state.
130 *
131 ******************************************************************************/
132
133acpi_status
134acpi_get_sleep_type_data (
135 u8 sleep_state,
136 u8 *sleep_type_a,
137 u8 *sleep_type_b)
138{
139 acpi_status status = AE_OK;
140 struct acpi_parameter_info info;
141
142
143 ACPI_FUNCTION_TRACE ("acpi_get_sleep_type_data");
144
145
146 /*
147 * Validate parameters
148 */
149 if ((sleep_state > ACPI_S_STATES_MAX) ||
150 !sleep_type_a || !sleep_type_b) {
151 return_ACPI_STATUS (AE_BAD_PARAMETER);
152 }
153
154 /*
155 * Evaluate the namespace object containing the values for this state
156 */
157 info.parameters = NULL;
158 status = acpi_ns_evaluate_by_name ((char *) acpi_gbl_sleep_state_names[sleep_state],
159 &info);
160 if (ACPI_FAILURE (status)) {
161 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s while evaluating sleep_state [%s]\n",
162 acpi_format_exception (status), acpi_gbl_sleep_state_names[sleep_state]));
163
164 return_ACPI_STATUS (status);
165 }
166
167 /* Must have a return object */
168
169 if (!info.return_object) {
170 ACPI_REPORT_ERROR (("Missing Sleep State object\n"));
171 status = AE_NOT_EXIST;
172 }
173
174 /* It must be of type Package */
175
176 else if (ACPI_GET_OBJECT_TYPE (info.return_object) != ACPI_TYPE_PACKAGE) {
177 ACPI_REPORT_ERROR (("Sleep State object not a Package\n"));
178 status = AE_AML_OPERAND_TYPE;
179 }
180
181 /* The package must have at least two elements */
182
183 else if (info.return_object->package.count < 2) {
184 ACPI_REPORT_ERROR (("Sleep State package does not have at least two elements\n"));
185 status = AE_AML_NO_OPERAND;
186 }
187
188 /* The first two elements must both be of type Integer */
189
190 else if ((ACPI_GET_OBJECT_TYPE (info.return_object->package.elements[0]) != ACPI_TYPE_INTEGER) ||
191 (ACPI_GET_OBJECT_TYPE (info.return_object->package.elements[1]) != ACPI_TYPE_INTEGER)) {
192 ACPI_REPORT_ERROR (("Sleep State package elements are not both Integers (%s, %s)\n",
193 acpi_ut_get_object_type_name (info.return_object->package.elements[0]),
194 acpi_ut_get_object_type_name (info.return_object->package.elements[1])));
195 status = AE_AML_OPERAND_TYPE;
196 }
197 else {
198 /*
199 * Valid _Sx_ package size, type, and value
200 */
201 *sleep_type_a = (u8) (info.return_object->package.elements[0])->integer.value;
202 *sleep_type_b = (u8) (info.return_object->package.elements[1])->integer.value;
203 }
204
205 if (ACPI_FAILURE (status)) {
206 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
207 "While evaluating sleep_state [%s], bad Sleep object %p type %s\n",
208 acpi_gbl_sleep_state_names[sleep_state], info.return_object,
209 acpi_ut_get_object_type_name (info.return_object)));
210 }
211
212 acpi_ut_remove_reference (info.return_object);
213 return_ACPI_STATUS (status);
214}
215EXPORT_SYMBOL(acpi_get_sleep_type_data);
216
217
218/*******************************************************************************
219 *
220 * FUNCTION: acpi_hw_get_register_bit_mask
221 *
222 * PARAMETERS: register_id - Index of ACPI Register to access
223 *
224 * RETURN: The bit mask to be used when accessing the register
225 *
226 * DESCRIPTION: Map register_id into a register bit mask.
227 *
228 ******************************************************************************/
229
230struct acpi_bit_register_info *
231acpi_hw_get_bit_register_info (
232 u32 register_id)
233{
234 ACPI_FUNCTION_NAME ("hw_get_bit_register_info");
235
236
237 if (register_id > ACPI_BITREG_MAX) {
238 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid bit_register ID: %X\n", register_id));
239 return (NULL);
240 }
241
242 return (&acpi_gbl_bit_register_info[register_id]);
243}
244
245
246/*******************************************************************************
247 *
248 * FUNCTION: acpi_get_register
249 *
250 * PARAMETERS: register_id - ID of ACPI bit_register to access
251 * return_value - Value that was read from the register
252 * Flags - Lock the hardware or not
253 *
254 * RETURN: Status and the value read from specified Register. Value
255 * returned is normalized to bit0 (is shifted all the way right)
256 *
257 * DESCRIPTION: ACPI bit_register read function.
258 *
259 ******************************************************************************/
260
261acpi_status
262acpi_get_register (
263 u32 register_id,
264 u32 *return_value,
265 u32 flags)
266{
267 u32 register_value = 0;
268 struct acpi_bit_register_info *bit_reg_info;
269 acpi_status status;
270
271
272 ACPI_FUNCTION_TRACE ("acpi_get_register");
273
274
275 /* Get the info structure corresponding to the requested ACPI Register */
276
277 bit_reg_info = acpi_hw_get_bit_register_info (register_id);
278 if (!bit_reg_info) {
279 return_ACPI_STATUS (AE_BAD_PARAMETER);
280 }
281
282 if (flags & ACPI_MTX_LOCK) {
283 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
284 if (ACPI_FAILURE (status)) {
285 return_ACPI_STATUS (status);
286 }
287 }
288
289 /* Read from the register */
290
291 status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
292 bit_reg_info->parent_register, ®ister_value);
293
294 if (flags & ACPI_MTX_LOCK) {
295 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
296 }
297
298 if (ACPI_SUCCESS (status)) {
299 /* Normalize the value that was read */
300
301 register_value = ((register_value & bit_reg_info->access_bit_mask)
302 >> bit_reg_info->bit_position);
303
304 *return_value = register_value;
305
306 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read value %8.8X register %X\n",
307 register_value, bit_reg_info->parent_register));
308 }
309
310 return_ACPI_STATUS (status);
311}
312EXPORT_SYMBOL(acpi_get_register);
313
314
315/*******************************************************************************
316 *
317 * FUNCTION: acpi_set_register
318 *
319 * PARAMETERS: register_id - ID of ACPI bit_register to access
320 * Value - (only used on write) value to write to the
321 * Register, NOT pre-normalized to the bit pos
322 * Flags - Lock the hardware or not
323 *
324 * RETURN: Status
325 *
326 * DESCRIPTION: ACPI Bit Register write function.
327 *
328 ******************************************************************************/
329
330acpi_status
331acpi_set_register (
332 u32 register_id,
333 u32 value,
334 u32 flags)
335{
336 u32 register_value = 0;
337 struct acpi_bit_register_info *bit_reg_info;
338 acpi_status status;
339
340
341 ACPI_FUNCTION_TRACE_U32 ("acpi_set_register", register_id);
342
343
344 /* Get the info structure corresponding to the requested ACPI Register */
345
346 bit_reg_info = acpi_hw_get_bit_register_info (register_id);
347 if (!bit_reg_info) {
348 ACPI_REPORT_ERROR (("Bad ACPI HW register_id: %X\n", register_id));
349 return_ACPI_STATUS (AE_BAD_PARAMETER);
350 }
351
352 if (flags & ACPI_MTX_LOCK) {
353 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
354 if (ACPI_FAILURE (status)) {
355 return_ACPI_STATUS (status);
356 }
357 }
358
359 /* Always do a register read first so we can insert the new bits */
360
361 status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
362 bit_reg_info->parent_register, ®ister_value);
363 if (ACPI_FAILURE (status)) {
364 goto unlock_and_exit;
365 }
366
367 /*
368 * Decode the Register ID
369 * Register ID = [Register block ID] | [bit ID]
370 *
371 * Check bit ID to fine locate Register offset.
372 * Check Mask to determine Register offset, and then read-write.
373 */
374 switch (bit_reg_info->parent_register) {
375 case ACPI_REGISTER_PM1_STATUS:
376
377 /*
378 * Status Registers are different from the rest. Clear by
379 * writing 1, and writing 0 has no effect. So, the only relevant
380 * information is the single bit we're interested in, all others should
381 * be written as 0 so they will be left unchanged.
382 */
383 value = ACPI_REGISTER_PREPARE_BITS (value,
384 bit_reg_info->bit_position, bit_reg_info->access_bit_mask);
385 if (value) {
386 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
387 ACPI_REGISTER_PM1_STATUS, (u16) value);
388 register_value = 0;
389 }
390 break;
391
392
393 case ACPI_REGISTER_PM1_ENABLE:
394
395 ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
396 bit_reg_info->access_bit_mask, value);
397
398 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
399 ACPI_REGISTER_PM1_ENABLE, (u16) register_value);
400 break;
401
402
403 case ACPI_REGISTER_PM1_CONTROL:
404
405 /*
406 * Write the PM1 Control register.
407 * Note that at this level, the fact that there are actually TWO
408 * registers (A and B - and B may not exist) is abstracted.
409 */
410 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM1 control: Read %X\n", register_value));
411
412 ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
413 bit_reg_info->access_bit_mask, value);
414
415 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
416 ACPI_REGISTER_PM1_CONTROL, (u16) register_value);
417 break;
418
419
420 case ACPI_REGISTER_PM2_CONTROL:
421
422 status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
423 ACPI_REGISTER_PM2_CONTROL, ®ister_value);
424 if (ACPI_FAILURE (status)) {
425 goto unlock_and_exit;
426 }
427
428 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM2 control: Read %X from %8.8X%8.8X\n",
429 register_value,
430 ACPI_FORMAT_UINT64 (acpi_gbl_FADT->xpm2_cnt_blk.address)));
431
432 ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
433 bit_reg_info->access_bit_mask, value);
434
435 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %4.4X to %8.8X%8.8X\n",
436 register_value,
437 ACPI_FORMAT_UINT64 (acpi_gbl_FADT->xpm2_cnt_blk.address)));
438
439 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
440 ACPI_REGISTER_PM2_CONTROL, (u8) (register_value));
441 break;
442
443
444 default:
445 break;
446 }
447
448
449unlock_and_exit:
450
451 if (flags & ACPI_MTX_LOCK) {
452 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
453 }
454
455 /* Normalize the value that was read */
456
457 ACPI_DEBUG_EXEC (register_value = ((register_value & bit_reg_info->access_bit_mask) >> bit_reg_info->bit_position));
458
459 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Set bits: %8.8X actual %8.8X register %X\n",
460 value, register_value, bit_reg_info->parent_register));
461 return_ACPI_STATUS (status);
462}
463EXPORT_SYMBOL(acpi_set_register);
464
465
466/******************************************************************************
467 *
468 * FUNCTION: acpi_hw_register_read
469 *
470 * PARAMETERS: use_lock - Mutex hw access
471 * register_id - register_iD + Offset
472 * return_value - Value that was read from the register
473 *
474 * RETURN: Status and the value read.
475 *
476 * DESCRIPTION: Acpi register read function. Registers are read at the
477 * given offset.
478 *
479 ******************************************************************************/
480
481acpi_status
482acpi_hw_register_read (
483 u8 use_lock,
484 u32 register_id,
485 u32 *return_value)
486{
487 u32 value1 = 0;
488 u32 value2 = 0;
489 acpi_status status;
490
491
492 ACPI_FUNCTION_TRACE ("hw_register_read");
493
494
495 if (ACPI_MTX_LOCK == use_lock) {
496 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
497 if (ACPI_FAILURE (status)) {
498 return_ACPI_STATUS (status);
499 }
500 }
501
502 switch (register_id) {
503 case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
504
505 status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_evt_blk);
506 if (ACPI_FAILURE (status)) {
507 goto unlock_and_exit;
508 }
509
510 /* PM1B is optional */
511
512 status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_evt_blk);
513 value1 |= value2;
514 break;
515
516
517 case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */
518
519 status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_xpm1a_enable);
520 if (ACPI_FAILURE (status)) {
521 goto unlock_and_exit;
522 }
523
524 /* PM1B is optional */
525
526 status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_xpm1b_enable);
527 value1 |= value2;
528 break;
529
530
531 case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
532
533 status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_cnt_blk);
534 if (ACPI_FAILURE (status)) {
535 goto unlock_and_exit;
536 }
537
538 status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_cnt_blk);
539 value1 |= value2;
540 break;
541
542
543 case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
544
545 status = acpi_hw_low_level_read (8, &value1, &acpi_gbl_FADT->xpm2_cnt_blk);
546 break;
547
548
549 case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
550
551 status = acpi_hw_low_level_read (32, &value1, &acpi_gbl_FADT->xpm_tmr_blk);
552 break;
553
554 case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
555
556 status = acpi_os_read_port (acpi_gbl_FADT->smi_cmd, &value1, 8);
557 break;
558
559 default:
560 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Register ID: %X\n", register_id));
561 status = AE_BAD_PARAMETER;
562 break;
563 }
564
565unlock_and_exit:
566 if (ACPI_MTX_LOCK == use_lock) {
567 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
568 }
569
570 if (ACPI_SUCCESS (status)) {
571 *return_value = value1;
572 }
573
574 return_ACPI_STATUS (status);
575}
576
577
578/******************************************************************************
579 *
580 * FUNCTION: acpi_hw_register_write
581 *
582 * PARAMETERS: use_lock - Mutex hw access
583 * register_id - register_iD + Offset
584 * Value - The value to write
585 *
586 * RETURN: Status
587 *
588 * DESCRIPTION: Acpi register Write function. Registers are written at the
589 * given offset.
590 *
591 ******************************************************************************/
592
593acpi_status
594acpi_hw_register_write (
595 u8 use_lock,
596 u32 register_id,
597 u32 value)
598{
599 acpi_status status;
600
601
602 ACPI_FUNCTION_TRACE ("hw_register_write");
603
604
605 if (ACPI_MTX_LOCK == use_lock) {
606 status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
607 if (ACPI_FAILURE (status)) {
608 return_ACPI_STATUS (status);
609 }
610 }
611
612 switch (register_id) {
613 case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
614
615 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_evt_blk);
616 if (ACPI_FAILURE (status)) {
617 goto unlock_and_exit;
618 }
619
620 /* PM1B is optional */
621
622 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_evt_blk);
623 break;
624
625
626 case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access*/
627
628 status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1a_enable);
629 if (ACPI_FAILURE (status)) {
630 goto unlock_and_exit;
631 }
632
633 /* PM1B is optional */
634
635 status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1b_enable);
636 break;
637
638
639 case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
640
641 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk);
642 if (ACPI_FAILURE (status)) {
643 goto unlock_and_exit;
644 }
645
646 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk);
647 break;
648
649
650 case ACPI_REGISTER_PM1A_CONTROL: /* 16-bit access */
651
652 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk);
653 break;
654
655
656 case ACPI_REGISTER_PM1B_CONTROL: /* 16-bit access */
657
658 status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk);
659 break;
660
661
662 case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
663
664 status = acpi_hw_low_level_write (8, value, &acpi_gbl_FADT->xpm2_cnt_blk);
665 break;
666
667
668 case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
669
670 status = acpi_hw_low_level_write (32, value, &acpi_gbl_FADT->xpm_tmr_blk);
671 break;
672
673
674 case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
675
676 /* SMI_CMD is currently always in IO space */
677
678 status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd, value, 8);
679 break;
680
681
682 default:
683 status = AE_BAD_PARAMETER;
684 break;
685 }
686
687unlock_and_exit:
688 if (ACPI_MTX_LOCK == use_lock) {
689 (void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
690 }
691
692 return_ACPI_STATUS (status);
693}
694
695
696/******************************************************************************
697 *
698 * FUNCTION: acpi_hw_low_level_read
699 *
700 * PARAMETERS: Width - 8, 16, or 32
701 * Value - Where the value is returned
702 * Reg - GAS register structure
703 *
704 * RETURN: Status
705 *
706 * DESCRIPTION: Read from either memory or IO space.
707 *
708 ******************************************************************************/
709
710acpi_status
711acpi_hw_low_level_read (
712 u32 width,
713 u32 *value,
714 struct acpi_generic_address *reg)
715{
716 u64 address;
717 acpi_status status;
718
719
720 ACPI_FUNCTION_NAME ("hw_low_level_read");
721
722
723 /*
724 * Must have a valid pointer to a GAS structure, and
725 * a non-zero address within. However, don't return an error
726 * because the PM1A/B code must not fail if B isn't present.
727 */
728 if (!reg) {
729 return (AE_OK);
730 }
731
732 /* Get a local copy of the address. Handles possible alignment issues */
733
734 ACPI_MOVE_64_TO_64 (&address, ®->address);
735 if (!address) {
736 return (AE_OK);
737 }
738 *value = 0;
739
740 /*
741 * Two address spaces supported: Memory or IO.
742 * PCI_Config is not supported here because the GAS struct is insufficient
743 */
744 switch (reg->address_space_id) {
745 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
746
747 status = acpi_os_read_memory (
748 (acpi_physical_address) address,
749 value, width);
750 break;
751
752
753 case ACPI_ADR_SPACE_SYSTEM_IO:
754
755 status = acpi_os_read_port ((acpi_io_address) address,
756 value, width);
757 break;
758
759
760 default:
761 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
762 "Unsupported address space: %X\n", reg->address_space_id));
763 return (AE_BAD_PARAMETER);
764 }
765
766 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n",
767 *value, width,
768 ACPI_FORMAT_UINT64 (address),
769 acpi_ut_get_region_name (reg->address_space_id)));
770
771 return (status);
772}
773
774
775/******************************************************************************
776 *
777 * FUNCTION: acpi_hw_low_level_write
778 *
779 * PARAMETERS: Width - 8, 16, or 32
780 * Value - To be written
781 * Reg - GAS register structure
782 *
783 * RETURN: Status
784 *
785 * DESCRIPTION: Write to either memory or IO space.
786 *
787 ******************************************************************************/
788
789acpi_status
790acpi_hw_low_level_write (
791 u32 width,
792 u32 value,
793 struct acpi_generic_address *reg)
794{
795 u64 address;
796 acpi_status status;
797
798
799 ACPI_FUNCTION_NAME ("hw_low_level_write");
800
801
802 /*
803 * Must have a valid pointer to a GAS structure, and
804 * a non-zero address within. However, don't return an error
805 * because the PM1A/B code must not fail if B isn't present.
806 */
807 if (!reg) {
808 return (AE_OK);
809 }
810
811 /* Get a local copy of the address. Handles possible alignment issues */
812
813 ACPI_MOVE_64_TO_64 (&address, ®->address);
814 if (!address) {
815 return (AE_OK);
816 }
817
818 /*
819 * Two address spaces supported: Memory or IO.
820 * PCI_Config is not supported here because the GAS struct is insufficient
821 */
822 switch (reg->address_space_id) {
823 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
824
825 status = acpi_os_write_memory (
826 (acpi_physical_address) address,
827 value, width);
828 break;
829
830
831 case ACPI_ADR_SPACE_SYSTEM_IO:
832
833 status = acpi_os_write_port ((acpi_io_address) address,
834 value, width);
835 break;
836
837
838 default:
839 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
840 "Unsupported address space: %X\n", reg->address_space_id));
841 return (AE_BAD_PARAMETER);
842 }
843
844 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n",
845 value, width,
846 ACPI_FORMAT_UINT64 (address),
847 acpi_ut_get_region_name (reg->address_space_id)));
848
849 return (status);
850}