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-rw-r--r--drivers/acpi/acpica/hwxface.c593
1 files changed, 593 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c
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index 000000000000..a4456fc9462d
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+++ b/drivers/acpi/acpica/hwxface.c
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1
2/******************************************************************************
3 *
4 * Module Name: hwxface - Public ACPICA hardware interfaces
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2008, 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 <acpi/accommon.h>
47#include <acpi/acnamesp.h>
48
49#define _COMPONENT ACPI_HARDWARE
50ACPI_MODULE_NAME("hwxface")
51
52/******************************************************************************
53 *
54 * FUNCTION: acpi_reset
55 *
56 * PARAMETERS: None
57 *
58 * RETURN: Status
59 *
60 * DESCRIPTION: Set reset register in memory or IO space. Note: Does not
61 * support reset register in PCI config space, this must be
62 * handled separately.
63 *
64 ******************************************************************************/
65acpi_status acpi_reset(void)
66{
67 struct acpi_generic_address *reset_reg;
68 acpi_status status;
69
70 ACPI_FUNCTION_TRACE(acpi_reset);
71
72 reset_reg = &acpi_gbl_FADT.reset_register;
73
74 /* Check if the reset register is supported */
75
76 if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
77 !reset_reg->address) {
78 return_ACPI_STATUS(AE_NOT_EXIST);
79 }
80
81 /* Write the reset value to the reset register */
82
83 status = acpi_write(acpi_gbl_FADT.reset_value, reset_reg);
84 return_ACPI_STATUS(status);
85}
86
87ACPI_EXPORT_SYMBOL(acpi_reset)
88
89/******************************************************************************
90 *
91 * FUNCTION: acpi_read
92 *
93 * PARAMETERS: Value - Where the value is returned
94 * Reg - GAS register structure
95 *
96 * RETURN: Status
97 *
98 * DESCRIPTION: Read from either memory or IO space.
99 *
100 ******************************************************************************/
101acpi_status acpi_read(u32 *value, struct acpi_generic_address *reg)
102{
103 u32 width;
104 u64 address;
105 acpi_status status;
106
107 ACPI_FUNCTION_NAME(acpi_read);
108
109 /*
110 * Must have a valid pointer to a GAS structure, and
111 * a non-zero address within. However, don't return an error
112 * because the PM1A/B code must not fail if B isn't present.
113 */
114 if (!reg) {
115 return (AE_OK);
116 }
117
118 /* Get a local copy of the address. Handles possible alignment issues */
119
120 ACPI_MOVE_64_TO_64(&address, &reg->address);
121 if (!address) {
122 return (AE_OK);
123 }
124
125 /* Supported widths are 8/16/32 */
126
127 width = reg->bit_width;
128 if ((width != 8) && (width != 16) && (width != 32)) {
129 return (AE_SUPPORT);
130 }
131
132 /* Initialize entire 32-bit return value to zero */
133
134 *value = 0;
135
136 /*
137 * Two address spaces supported: Memory or IO.
138 * PCI_Config is not supported here because the GAS struct is insufficient
139 */
140 switch (reg->space_id) {
141 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
142
143 status = acpi_os_read_memory((acpi_physical_address) address,
144 value, width);
145 break;
146
147 case ACPI_ADR_SPACE_SYSTEM_IO:
148
149 status =
150 acpi_os_read_port((acpi_io_address) address, value, width);
151 break;
152
153 default:
154 ACPI_ERROR((AE_INFO,
155 "Unsupported address space: %X", reg->space_id));
156 return (AE_BAD_PARAMETER);
157 }
158
159 ACPI_DEBUG_PRINT((ACPI_DB_IO,
160 "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n",
161 *value, width, ACPI_FORMAT_UINT64(address),
162 acpi_ut_get_region_name(reg->space_id)));
163
164 return (status);
165}
166
167ACPI_EXPORT_SYMBOL(acpi_read)
168
169/******************************************************************************
170 *
171 * FUNCTION: acpi_write
172 *
173 * PARAMETERS: Value - To be written
174 * Reg - GAS register structure
175 *
176 * RETURN: Status
177 *
178 * DESCRIPTION: Write to either memory or IO space.
179 *
180 ******************************************************************************/
181acpi_status acpi_write(u32 value, struct acpi_generic_address *reg)
182{
183 u32 width;
184 u64 address;
185 acpi_status status;
186
187 ACPI_FUNCTION_NAME(acpi_write);
188
189 /*
190 * Must have a valid pointer to a GAS structure, and
191 * a non-zero address within. However, don't return an error
192 * because the PM1A/B code must not fail if B isn't present.
193 */
194 if (!reg) {
195 return (AE_OK);
196 }
197
198 /* Get a local copy of the address. Handles possible alignment issues */
199
200 ACPI_MOVE_64_TO_64(&address, &reg->address);
201 if (!address) {
202 return (AE_OK);
203 }
204
205 /* Supported widths are 8/16/32 */
206
207 width = reg->bit_width;
208 if ((width != 8) && (width != 16) && (width != 32)) {
209 return (AE_SUPPORT);
210 }
211
212 /*
213 * Two address spaces supported: Memory or IO.
214 * PCI_Config is not supported here because the GAS struct is insufficient
215 */
216 switch (reg->space_id) {
217 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
218
219 status = acpi_os_write_memory((acpi_physical_address) address,
220 value, width);
221 break;
222
223 case ACPI_ADR_SPACE_SYSTEM_IO:
224
225 status = acpi_os_write_port((acpi_io_address) address, value,
226 width);
227 break;
228
229 default:
230 ACPI_ERROR((AE_INFO,
231 "Unsupported address space: %X", reg->space_id));
232 return (AE_BAD_PARAMETER);
233 }
234
235 ACPI_DEBUG_PRINT((ACPI_DB_IO,
236 "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n",
237 value, width, ACPI_FORMAT_UINT64(address),
238 acpi_ut_get_region_name(reg->space_id)));
239
240 return (status);
241}
242
243ACPI_EXPORT_SYMBOL(acpi_write)
244
245/*******************************************************************************
246 *
247 * FUNCTION: acpi_get_register_unlocked
248 *
249 * PARAMETERS: register_id - ID of ACPI bit_register to access
250 * return_value - Value that was read from the register
251 *
252 * RETURN: Status and the value read from specified Register. Value
253 * returned is normalized to bit0 (is shifted all the way right)
254 *
255 * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
256 *
257 ******************************************************************************/
258acpi_status acpi_get_register_unlocked(u32 register_id, u32 *return_value)
259{
260 u32 register_value = 0;
261 struct acpi_bit_register_info *bit_reg_info;
262 acpi_status status;
263
264 ACPI_FUNCTION_TRACE(acpi_get_register_unlocked);
265
266 /* Get the info structure corresponding to the requested ACPI Register */
267
268 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
269 if (!bit_reg_info) {
270 return_ACPI_STATUS(AE_BAD_PARAMETER);
271 }
272
273 /* Read from the register */
274
275 status = acpi_hw_register_read(bit_reg_info->parent_register,
276 &register_value);
277
278 if (ACPI_SUCCESS(status)) {
279
280 /* Normalize the value that was read */
281
282 register_value =
283 ((register_value & bit_reg_info->access_bit_mask)
284 >> bit_reg_info->bit_position);
285
286 *return_value = register_value;
287
288 ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n",
289 register_value,
290 bit_reg_info->parent_register));
291 }
292
293 return_ACPI_STATUS(status);
294}
295
296ACPI_EXPORT_SYMBOL(acpi_get_register_unlocked)
297
298/*******************************************************************************
299 *
300 * FUNCTION: acpi_get_register
301 *
302 * PARAMETERS: register_id - ID of ACPI bit_register to access
303 * return_value - Value that was read from the register
304 *
305 * RETURN: Status and the value read from specified Register. Value
306 * returned is normalized to bit0 (is shifted all the way right)
307 *
308 * DESCRIPTION: ACPI bit_register read function.
309 *
310 ******************************************************************************/
311acpi_status acpi_get_register(u32 register_id, u32 *return_value)
312{
313 acpi_status status;
314 acpi_cpu_flags flags;
315
316 flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
317 status = acpi_get_register_unlocked(register_id, return_value);
318 acpi_os_release_lock(acpi_gbl_hardware_lock, flags);
319
320 return (status);
321}
322
323ACPI_EXPORT_SYMBOL(acpi_get_register)
324
325/*******************************************************************************
326 *
327 * FUNCTION: acpi_set_register
328 *
329 * PARAMETERS: register_id - ID of ACPI bit_register to access
330 * Value - (only used on write) value to write to the
331 * Register, NOT pre-normalized to the bit pos
332 *
333 * RETURN: Status
334 *
335 * DESCRIPTION: ACPI Bit Register write function.
336 *
337 ******************************************************************************/
338acpi_status acpi_set_register(u32 register_id, u32 value)
339{
340 u32 register_value = 0;
341 struct acpi_bit_register_info *bit_reg_info;
342 acpi_status status;
343 acpi_cpu_flags lock_flags;
344
345 ACPI_FUNCTION_TRACE_U32(acpi_set_register, register_id);
346
347 /* Get the info structure corresponding to the requested ACPI Register */
348
349 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
350 if (!bit_reg_info) {
351 ACPI_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X",
352 register_id));
353 return_ACPI_STATUS(AE_BAD_PARAMETER);
354 }
355
356 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
357
358 /* Always do a register read first so we can insert the new bits */
359
360 status = acpi_hw_register_read(bit_reg_info->parent_register,
361 &register_value);
362 if (ACPI_FAILURE(status)) {
363 goto unlock_and_exit;
364 }
365
366 /*
367 * Decode the Register ID
368 * Register ID = [Register block ID] | [bit ID]
369 *
370 * Check bit ID to fine locate Register offset.
371 * Check Mask to determine Register offset, and then read-write.
372 */
373 switch (bit_reg_info->parent_register) {
374 case ACPI_REGISTER_PM1_STATUS:
375
376 /*
377 * Status Registers are different from the rest. Clear by
378 * writing 1, and writing 0 has no effect. So, the only relevant
379 * information is the single bit we're interested in, all others should
380 * be written as 0 so they will be left unchanged.
381 */
382 value = ACPI_REGISTER_PREPARE_BITS(value,
383 bit_reg_info->bit_position,
384 bit_reg_info->
385 access_bit_mask);
386 if (value) {
387 status =
388 acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
389 (u16) value);
390 register_value = 0;
391 }
392 break;
393
394 case ACPI_REGISTER_PM1_ENABLE:
395
396 ACPI_REGISTER_INSERT_VALUE(register_value,
397 bit_reg_info->bit_position,
398 bit_reg_info->access_bit_mask,
399 value);
400
401 status = acpi_hw_register_write(ACPI_REGISTER_PM1_ENABLE,
402 (u16) register_value);
403 break;
404
405 case ACPI_REGISTER_PM1_CONTROL:
406
407 /*
408 * Write the PM1 Control register.
409 * Note that at this level, the fact that there are actually TWO
410 * registers (A and B - and B may not exist) is abstracted.
411 */
412 ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n",
413 register_value));
414
415 ACPI_REGISTER_INSERT_VALUE(register_value,
416 bit_reg_info->bit_position,
417 bit_reg_info->access_bit_mask,
418 value);
419
420 status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
421 (u16) register_value);
422 break;
423
424 case ACPI_REGISTER_PM2_CONTROL:
425
426 status = acpi_hw_register_read(ACPI_REGISTER_PM2_CONTROL,
427 &register_value);
428 if (ACPI_FAILURE(status)) {
429 goto unlock_and_exit;
430 }
431
432 ACPI_DEBUG_PRINT((ACPI_DB_IO,
433 "PM2 control: Read %X from %8.8X%8.8X\n",
434 register_value,
435 ACPI_FORMAT_UINT64(acpi_gbl_FADT.
436 xpm2_control_block.
437 address)));
438
439 ACPI_REGISTER_INSERT_VALUE(register_value,
440 bit_reg_info->bit_position,
441 bit_reg_info->access_bit_mask,
442 value);
443
444 ACPI_DEBUG_PRINT((ACPI_DB_IO,
445 "About to write %4.4X to %8.8X%8.8X\n",
446 register_value,
447 ACPI_FORMAT_UINT64(acpi_gbl_FADT.
448 xpm2_control_block.
449 address)));
450
451 status = acpi_hw_register_write(ACPI_REGISTER_PM2_CONTROL,
452 (u8) (register_value));
453 break;
454
455 default:
456 break;
457 }
458
459 unlock_and_exit:
460
461 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
462
463 /* Normalize the value that was read */
464
465 ACPI_DEBUG_EXEC(register_value =
466 ((register_value & bit_reg_info->access_bit_mask) >>
467 bit_reg_info->bit_position));
468
469 ACPI_DEBUG_PRINT((ACPI_DB_IO,
470 "Set bits: %8.8X actual %8.8X register %X\n", value,
471 register_value, bit_reg_info->parent_register));
472 return_ACPI_STATUS(status);
473}
474
475ACPI_EXPORT_SYMBOL(acpi_set_register)
476
477/*******************************************************************************
478 *
479 * FUNCTION: acpi_get_sleep_type_data
480 *
481 * PARAMETERS: sleep_state - Numeric sleep state
482 * *sleep_type_a - Where SLP_TYPa is returned
483 * *sleep_type_b - Where SLP_TYPb is returned
484 *
485 * RETURN: Status - ACPI status
486 *
487 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
488 * state.
489 *
490 ******************************************************************************/
491acpi_status
492acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
493{
494 acpi_status status = AE_OK;
495 struct acpi_evaluate_info *info;
496
497 ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
498
499 /* Validate parameters */
500
501 if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
502 return_ACPI_STATUS(AE_BAD_PARAMETER);
503 }
504
505 /* Allocate the evaluation information block */
506
507 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
508 if (!info) {
509 return_ACPI_STATUS(AE_NO_MEMORY);
510 }
511
512 info->pathname =
513 ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
514
515 /* Evaluate the namespace object containing the values for this state */
516
517 status = acpi_ns_evaluate(info);
518 if (ACPI_FAILURE(status)) {
519 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
520 "%s while evaluating SleepState [%s]\n",
521 acpi_format_exception(status),
522 info->pathname));
523
524 goto cleanup;
525 }
526
527 /* Must have a return object */
528
529 if (!info->return_object) {
530 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
531 info->pathname));
532 status = AE_NOT_EXIST;
533 }
534
535 /* It must be of type Package */
536
537 else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) {
538 ACPI_ERROR((AE_INFO,
539 "Sleep State return object is not a Package"));
540 status = AE_AML_OPERAND_TYPE;
541 }
542
543 /*
544 * The package must have at least two elements. NOTE (March 2005): This
545 * goes against the current ACPI spec which defines this object as a
546 * package with one encoded DWORD element. However, existing practice
547 * by BIOS vendors seems to be to have 2 or more elements, at least
548 * one per sleep type (A/B).
549 */
550 else if (info->return_object->package.count < 2) {
551 ACPI_ERROR((AE_INFO,
552 "Sleep State return package does not have at least two elements"));
553 status = AE_AML_NO_OPERAND;
554 }
555
556 /* The first two elements must both be of type Integer */
557
558 else if ((ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[0])
559 != ACPI_TYPE_INTEGER) ||
560 (ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[1])
561 != ACPI_TYPE_INTEGER)) {
562 ACPI_ERROR((AE_INFO,
563 "Sleep State return package elements are not both Integers (%s, %s)",
564 acpi_ut_get_object_type_name(info->return_object->
565 package.elements[0]),
566 acpi_ut_get_object_type_name(info->return_object->
567 package.elements[1])));
568 status = AE_AML_OPERAND_TYPE;
569 } else {
570 /* Valid _Sx_ package size, type, and value */
571
572 *sleep_type_a = (u8)
573 (info->return_object->package.elements[0])->integer.value;
574 *sleep_type_b = (u8)
575 (info->return_object->package.elements[1])->integer.value;
576 }
577
578 if (ACPI_FAILURE(status)) {
579 ACPI_EXCEPTION((AE_INFO, status,
580 "While evaluating SleepState [%s], bad Sleep object %p type %s",
581 info->pathname, info->return_object,
582 acpi_ut_get_object_type_name(info->
583 return_object)));
584 }
585
586 acpi_ut_remove_reference(info->return_object);
587
588 cleanup:
589 ACPI_FREE(info);
590 return_ACPI_STATUS(status);
591}
592
593ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)