summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/hwxface.c
blob: 5ee7a814cd9207db34d42b8945867e415ab733bb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
/******************************************************************************
 *
 * Module Name: hwxface - Public ACPICA hardware interfaces
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2013, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <linux/export.h>
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_HARDWARE
ACPI_MODULE_NAME("hwxface")

/******************************************************************************
 *
 * FUNCTION:    acpi_reset
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Set reset register in memory or IO space. Note: Does not
 *              support reset register in PCI config space, this must be
 *              handled separately.
 *
 ******************************************************************************/
acpi_status acpi_reset(void)
{
	struct acpi_generic_address *reset_reg;
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_reset);

	reset_reg = &acpi_gbl_FADT.reset_register;

	/* Check if the reset register is supported */

	if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
	    !reset_reg->address) {
		return_ACPI_STATUS(AE_NOT_EXIST);
	}

	if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
		/*
		 * For I/O space, write directly to the OSL. This bypasses the port
		 * validation mechanism, which may block a valid write to the reset
		 * register.
		 * Spec section 4.7.3.6 requires register width to be 8.
		 */
		status =
		    acpi_os_write_port((acpi_io_address) reset_reg->address,
				       acpi_gbl_FADT.reset_value, 8);
	} else {
		/* Write the reset value to the reset register */

		status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg);
	}

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_reset)

/******************************************************************************
 *
 * FUNCTION:    acpi_read
 *
 * PARAMETERS:  value               - Where the value is returned
 *              reg                 - GAS register structure
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Read from either memory or IO space.
 *
 * LIMITATIONS: <These limitations also apply to acpi_write>
 *      bit_width must be exactly 8, 16, 32, or 64.
 *      space_ID must be system_memory or system_IO.
 *      bit_offset and access_width are currently ignored, as there has
 *          not been a need to implement these.
 *
 ******************************************************************************/
acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg)
{
	u32 value;
	u32 width;
	u64 address;
	acpi_status status;

	ACPI_FUNCTION_NAME(acpi_read);

	if (!return_value) {
		return (AE_BAD_PARAMETER);
	}

	/* Validate contents of the GAS register. Allow 64-bit transfers */

	status = acpi_hw_validate_register(reg, 64, &address);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/* Initialize entire 64-bit return value to zero */

	*return_value = 0;
	value = 0;

	/*
	 * Two address spaces supported: Memory or IO. PCI_Config is
	 * not supported here because the GAS structure is insufficient
	 */
	if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
		status = acpi_os_read_memory((acpi_physical_address)
					     address, return_value,
					     reg->bit_width);
		if (ACPI_FAILURE(status)) {
			return (status);
		}
	} else {		/* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */

		width = reg->bit_width;
		if (width == 64) {
			width = 32;	/* Break into two 32-bit transfers */
		}

		status = acpi_hw_read_port((acpi_io_address)
					   address, &value, width);
		if (ACPI_FAILURE(status)) {
			return (status);
		}
		*return_value = value;

		if (reg->bit_width == 64) {

			/* Read the top 32 bits */

			status = acpi_hw_read_port((acpi_io_address)
						   (address + 4), &value, 32);
			if (ACPI_FAILURE(status)) {
				return (status);
			}
			*return_value |= ((u64)value << 32);
		}
	}

	ACPI_DEBUG_PRINT((ACPI_DB_IO,
			  "Read:  %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n",
			  ACPI_FORMAT_UINT64(*return_value), reg->bit_width,
			  ACPI_FORMAT_UINT64(address),
			  acpi_ut_get_region_name(reg->space_id)));

	return (status);
}

ACPI_EXPORT_SYMBOL(acpi_read)

/******************************************************************************
 *
 * FUNCTION:    acpi_write
 *
 * PARAMETERS:  value               - Value to be written
 *              reg                 - GAS register structure
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Write to either memory or IO space.
 *
 ******************************************************************************/
acpi_status acpi_write(u64 value, struct acpi_generic_address *reg)
{
	u32 width;
	u64 address;
	acpi_status status;

	ACPI_FUNCTION_NAME(acpi_write);

	/* Validate contents of the GAS register. Allow 64-bit transfers */

	status = acpi_hw_validate_register(reg, 64, &address);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/*
	 * Two address spaces supported: Memory or IO. PCI_Config is
	 * not supported here because the GAS structure is insufficient
	 */
	if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
		status = acpi_os_write_memory((acpi_physical_address)
					      address, value, reg->bit_width);
		if (ACPI_FAILURE(status)) {
			return (status);
		}
	} else {		/* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */

		width = reg->bit_width;
		if (width == 64) {
			width = 32;	/* Break into two 32-bit transfers */
		}

		status = acpi_hw_write_port((acpi_io_address)
					    address, ACPI_LODWORD(value),
					    width);
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		if (reg->bit_width == 64) {
			status = acpi_hw_write_port((acpi_io_address)
						    (address + 4),
						    ACPI_HIDWORD(value), 32);
			if (ACPI_FAILURE(status)) {
				return (status);
			}
		}
	}

	ACPI_DEBUG_PRINT((ACPI_DB_IO,
			  "Wrote: %8.8X%8.8X width %2d   to %8.8X%8.8X (%s)\n",
			  ACPI_FORMAT_UINT64(value), reg->bit_width,
			  ACPI_FORMAT_UINT64(address),
			  acpi_ut_get_region_name(reg->space_id)));

	return (status);
}

ACPI_EXPORT_SYMBOL(acpi_write)

#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
 *
 * FUNCTION:    acpi_read_bit_register
 *
 * PARAMETERS:  register_id     - ID of ACPI Bit Register to access
 *              return_value    - Value that was read from the register,
 *                                normalized to bit position zero.
 *
 * RETURN:      Status and the value read from the specified Register. Value
 *              returned is normalized to bit0 (is shifted all the way right)
 *
 * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
 *
 * SUPPORTS:    Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
 *              PM2 Control.
 *
 * Note: The hardware lock is not required when reading the ACPI bit registers
 *       since almost all of them are single bit and it does not matter that
 *       the parent hardware register can be split across two physical
 *       registers. The only multi-bit field is SLP_TYP in the PM1 control
 *       register, but this field does not cross an 8-bit boundary (nor does
 *       it make much sense to actually read this field.)
 *
 ******************************************************************************/
acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value)
{
	struct acpi_bit_register_info *bit_reg_info;
	u32 register_value;
	u32 value;
	acpi_status status;

	ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id);

	/* Get the info structure corresponding to the requested ACPI Register */

	bit_reg_info = acpi_hw_get_bit_register_info(register_id);
	if (!bit_reg_info) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Read the entire parent register */

	status = acpi_hw_register_read(bit_reg_info->parent_register,
				       &register_value);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Normalize the value that was read, mask off other bits */

	value = ((register_value & bit_reg_info->access_bit_mask)
		 >> bit_reg_info->bit_position);

	ACPI_DEBUG_PRINT((ACPI_DB_IO,
			  "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n",
			  register_id, bit_reg_info->parent_register,
			  register_value, value));

	*return_value = value;
	return_ACPI_STATUS(AE_OK);
}

ACPI_EXPORT_SYMBOL(acpi_read_bit_register)

/*******************************************************************************
 *
 * FUNCTION:    acpi_write_bit_register
 *
 * PARAMETERS:  register_id     - ID of ACPI Bit Register to access
 *              value           - Value to write to the register, in bit
 *                                position zero. The bit is automatically
 *                                shifted to the correct position.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock
 *              since most operations require a read/modify/write sequence.
 *
 * SUPPORTS:    Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
 *              PM2 Control.
 *
 * Note that at this level, the fact that there may be actually two
 * hardware registers (A and B - and B may not exist) is abstracted.
 *
 ******************************************************************************/
acpi_status acpi_write_bit_register(u32 register_id, u32 value)
{
	struct acpi_bit_register_info *bit_reg_info;
	acpi_cpu_flags lock_flags;
	u32 register_value;
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id);

	/* Get the info structure corresponding to the requested ACPI Register */

	bit_reg_info = acpi_hw_get_bit_register_info(register_id);
	if (!bit_reg_info) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);

	/*
	 * At this point, we know that the parent register is one of the
	 * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control
	 */
	if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) {
		/*
		 * 1) Case for PM1 Enable, PM1 Control, and PM2 Control
		 *
		 * Perform a register read to preserve the bits that we are not
		 * interested in
		 */
		status = acpi_hw_register_read(bit_reg_info->parent_register,
					       &register_value);
		if (ACPI_FAILURE(status)) {
			goto unlock_and_exit;
		}

		/*
		 * Insert the input bit into the value that was just read
		 * and write the register
		 */
		ACPI_REGISTER_INSERT_VALUE(register_value,
					   bit_reg_info->bit_position,
					   bit_reg_info->access_bit_mask,
					   value);

		status = acpi_hw_register_write(bit_reg_info->parent_register,
						register_value);
	} else {
		/*
		 * 2) Case for PM1 Status
		 *
		 * The Status register is different from the rest. Clear an event
		 * by writing 1, writing 0 has no effect. So, the only relevant
		 * information is the single bit we're interested in, all others
		 * should be written as 0 so they will be left unchanged.
		 */
		register_value = ACPI_REGISTER_PREPARE_BITS(value,
							    bit_reg_info->
							    bit_position,
							    bit_reg_info->
							    access_bit_mask);

		/* No need to write the register if value is all zeros */

		if (register_value) {
			status =
			    acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
						   register_value);
		}
	}

	ACPI_DEBUG_PRINT((ACPI_DB_IO,
			  "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n",
			  register_id, bit_reg_info->parent_register, value,
			  register_value));

unlock_and_exit:

	acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_write_bit_register)
#endif				/* !ACPI_REDUCED_HARDWARE */
/*******************************************************************************
 *
 * FUNCTION:    acpi_get_sleep_type_data
 *
 * PARAMETERS:  sleep_state         - Numeric sleep state
 *              *sleep_type_a        - Where SLP_TYPa is returned
 *              *sleep_type_b        - Where SLP_TYPb is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested
 *              sleep state via the appropriate \_Sx object.
 *
 *  The sleep state package returned from the corresponding \_Sx_ object
 *  must contain at least one integer.
 *
 *  March 2005:
 *  Added support for a package that contains two integers. This
 *  goes against the ACPI specification which defines this object as a
 *  package with one encoded DWORD integer. However, existing practice
 *  by many BIOS vendors is to return a package with 2 or more integer
 *  elements, at least one per sleep type (A/B).
 *
 *  January 2013:
 *  Therefore, we must be prepared to accept a package with either a
 *  single integer or multiple integers.
 *
 *  The single integer DWORD format is as follows:
 *      BYTE 0 - Value for the PM1A SLP_TYP register
 *      BYTE 1 - Value for the PM1B SLP_TYP register
 *      BYTE 2-3 - Reserved
 *
 *  The dual integer format is as follows:
 *      Integer 0 - Value for the PM1A SLP_TYP register
 *      Integer 1 - Value for the PM1A SLP_TYP register
 *
 ******************************************************************************/
acpi_status
acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
{
	acpi_status status;
	struct acpi_evaluate_info *info;
	union acpi_operand_object **elements;

	ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);

	/* Validate parameters */

	if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Allocate the evaluation information block */

	info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
	if (!info) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/*
	 * Evaluate the \_Sx namespace object containing the register values
	 * for this state
	 */
	info->relative_pathname =
	    ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
	status = acpi_ns_evaluate(info);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/* Must have a return object */

	if (!info->return_object) {
		ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
			    info->relative_pathname));
		status = AE_AML_NO_RETURN_VALUE;
		goto cleanup;
	}

	/* Return object must be of type Package */

	if (info->return_object->common.type != ACPI_TYPE_PACKAGE) {
		ACPI_ERROR((AE_INFO,
			    "Sleep State return object is not a Package"));
		status = AE_AML_OPERAND_TYPE;
		goto cleanup1;
	}

	/*
	 * Any warnings about the package length or the object types have
	 * already been issued by the predefined name module -- there is no
	 * need to repeat them here.
	 */
	elements = info->return_object->package.elements;
	switch (info->return_object->package.count) {
	case 0:

		status = AE_AML_PACKAGE_LIMIT;
		break;

	case 1:

		if (elements[0]->common.type != ACPI_TYPE_INTEGER) {
			status = AE_AML_OPERAND_TYPE;
			break;
		}

		/* A valid _Sx_ package with one integer */

		*sleep_type_a = (u8)elements[0]->integer.value;
		*sleep_type_b = (u8)(elements[0]->integer.value >> 8);
		break;

	case 2:
	default:

		if ((elements[0]->common.type != ACPI_TYPE_INTEGER) ||
		    (elements[1]->common.type != ACPI_TYPE_INTEGER)) {
			status = AE_AML_OPERAND_TYPE;
			break;
		}

		/* A valid _Sx_ package with two integers */

		*sleep_type_a = (u8)elements[0]->integer.value;
		*sleep_type_b = (u8)elements[1]->integer.value;
		break;
	}

      cleanup1:
	acpi_ut_remove_reference(info->return_object);

      cleanup:
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status,
				"While evaluating Sleep State [%s]",
				info->relative_pathname));
	}

	ACPI_FREE(info);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)