aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/resources/rsirq.c
blob: fd07a8702fbe135c415bfcda82c6e25f5f8fe125 (plain) (blame)
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
579
580
581
582
583
584
585
586
587
588
589
590
591
592
/*******************************************************************************
 *
 * Module Name: rsirq - IRQ resource descriptors
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * 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 <acpi/acpi.h>
#include <acpi/acresrc.h>

#define _COMPONENT          ACPI_RESOURCES
	 ACPI_MODULE_NAME    ("rsirq")


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_irq_resource
 *
 * PARAMETERS:  byte_stream_buffer      - Pointer to the resource input byte
 *                                        stream
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        consumed the byte_stream_buffer is
 *                                        returned
 *              output_buffer           - Pointer to the return data buffer
 *              structure_size          - Pointer to where the number of bytes
 *                                        in the return data struct is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the resource byte stream and fill out the appropriate
 *              structure pointed to by the output_buffer. Return the
 *              number of bytes consumed from the byte stream.
 *
 ******************************************************************************/

acpi_status
acpi_rs_irq_resource (
	u8                              *byte_stream_buffer,
	acpi_size                       *bytes_consumed,
	u8                              **output_buffer,
	acpi_size                       *structure_size)
{
	u8                              *buffer = byte_stream_buffer;
	struct acpi_resource            *output_struct = (void *) *output_buffer;
	u16                             temp16 = 0;
	u8                              temp8 = 0;
	u8                              index;
	u8                              i;
	acpi_size                       struct_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_irq);


	ACPI_FUNCTION_TRACE ("rs_irq_resource");


	/*
	 * The number of bytes consumed are contained in the descriptor
	 *  (Bits:0-1)
	 */
	temp8 = *buffer;
	*bytes_consumed = (temp8 & 0x03) + 1;
	output_struct->id = ACPI_RSTYPE_IRQ;

	/*
	 * Point to the 16-bits of Bytes 1 and 2
	 */
	buffer += 1;
	ACPI_MOVE_16_TO_16 (&temp16, buffer);

	output_struct->data.irq.number_of_interrupts = 0;

	/* Decode the IRQ bits */

	for (i = 0, index = 0; index < 16; index++) {
		if ((temp16 >> index) & 0x01) {
			output_struct->data.irq.interrupts[i] = index;
			i++;
		}
	}

	/* Zero interrupts is valid */

	output_struct->data.irq.number_of_interrupts = i;
	if (i > 0) {
		/*
		 * Calculate the structure size based upon the number of interrupts
		 */
		struct_size += ((acpi_size) i - 1) * 4;
	}

	/*
	 * Point to Byte 3 if it is used
	 */
	if (4 == *bytes_consumed) {
		buffer += 2;
		temp8 = *buffer;

		/*
		 * Check for HE, LL interrupts
		 */
		switch (temp8 & 0x09) {
		case 0x01: /* HE */
			output_struct->data.irq.edge_level = ACPI_EDGE_SENSITIVE;
			output_struct->data.irq.active_high_low = ACPI_ACTIVE_HIGH;
			break;

		case 0x08: /* LL */
			output_struct->data.irq.edge_level = ACPI_LEVEL_SENSITIVE;
			output_struct->data.irq.active_high_low = ACPI_ACTIVE_LOW;
			break;

		default:
			/*
			 * Only _LL and _HE polarity/trigger interrupts
			 * are allowed (ACPI spec, section "IRQ Format")
			 * so 0x00 and 0x09 are illegal.
			 */
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
				"Invalid interrupt polarity/trigger in resource list, %X\n", temp8));
			return_ACPI_STATUS (AE_BAD_DATA);
		}

		/*
		 * Check for sharable
		 */
		output_struct->data.irq.shared_exclusive = (temp8 >> 3) & 0x01;
	}
	else {
		/*
		 * Assume Edge Sensitive, Active High, Non-Sharable
		 * per ACPI Specification
		 */
		output_struct->data.irq.edge_level = ACPI_EDGE_SENSITIVE;
		output_struct->data.irq.active_high_low = ACPI_ACTIVE_HIGH;
		output_struct->data.irq.shared_exclusive = ACPI_EXCLUSIVE;
	}

	/*
	 * Set the Length parameter
	 */
	output_struct->length = (u32) struct_size;

	/*
	 * Return the final size of the structure
	 */
	*structure_size = struct_size;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_irq_stream
 *
 * PARAMETERS:  linked_list             - Pointer to the resource linked list
 *              output_buffer           - Pointer to the user's return buffer
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        used in the output_buffer is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the linked list resource structure and fills in the
 *              the appropriate bytes in a byte stream
 *
 ******************************************************************************/

acpi_status
acpi_rs_irq_stream (
	struct acpi_resource            *linked_list,
	u8                              **output_buffer,
	acpi_size                       *bytes_consumed)
{
	u8                              *buffer = *output_buffer;
	u16                             temp16 = 0;
	u8                              temp8 = 0;
	u8                              index;
	u8                              IRqinfo_byte_needed;


	ACPI_FUNCTION_TRACE ("rs_irq_stream");


	/*
	 * The descriptor field is set based upon whether a third byte is
	 * needed to contain the IRQ Information.
	 */
	if (ACPI_EDGE_SENSITIVE == linked_list->data.irq.edge_level &&
		ACPI_ACTIVE_HIGH == linked_list->data.irq.active_high_low &&
		ACPI_EXCLUSIVE == linked_list->data.irq.shared_exclusive) {
		*buffer = 0x22;
		IRqinfo_byte_needed = FALSE;
	}
	else {
		*buffer = 0x23;
		IRqinfo_byte_needed = TRUE;
	}

	buffer += 1;
	temp16 = 0;

	/*
	 * Loop through all of the interrupts and set the mask bits
	 */
	for(index = 0;
		index < linked_list->data.irq.number_of_interrupts;
		index++) {
		temp8 = (u8) linked_list->data.irq.interrupts[index];
		temp16 |= 0x1 << temp8;
	}

	ACPI_MOVE_16_TO_16 (buffer, &temp16);
	buffer += 2;

	/*
	 * Set the IRQ Info byte if needed.
	 */
	if (IRqinfo_byte_needed) {
		temp8 = 0;
		temp8 = (u8) ((linked_list->data.irq.shared_exclusive &
				 0x01) << 4);

		if (ACPI_LEVEL_SENSITIVE == linked_list->data.irq.edge_level &&
			ACPI_ACTIVE_LOW == linked_list->data.irq.active_high_low) {
			temp8 |= 0x08;
		}
		else {
			temp8 |= 0x01;
		}

		*buffer = temp8;
		buffer += 1;
	}

	/*
	 * Return the number of bytes consumed in this operation
	 */
	*bytes_consumed = ACPI_PTR_DIFF (buffer, *output_buffer);
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_extended_irq_resource
 *
 * PARAMETERS:  byte_stream_buffer      - Pointer to the resource input byte
 *                                        stream
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        consumed the byte_stream_buffer is
 *                                        returned
 *              output_buffer           - Pointer to the return data buffer
 *              structure_size          - Pointer to where the number of bytes
 *                                        in the return data struct is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the resource byte stream and fill out the appropriate
 *              structure pointed to by the output_buffer. Return the
 *              number of bytes consumed from the byte stream.
 *
 ******************************************************************************/

acpi_status
acpi_rs_extended_irq_resource (
	u8                              *byte_stream_buffer,
	acpi_size                       *bytes_consumed,
	u8                              **output_buffer,
	acpi_size                       *structure_size)
{
	u8                              *buffer = byte_stream_buffer;
	struct acpi_resource            *output_struct = (void *) *output_buffer;
	u16                             temp16 = 0;
	u8                              temp8 = 0;
	u8                              *temp_ptr;
	u8                              index;
	acpi_size                       struct_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_ext_irq);


	ACPI_FUNCTION_TRACE ("rs_extended_irq_resource");


	/*
	 * Point past the Descriptor to get the number of bytes consumed
	 */
	buffer += 1;
	ACPI_MOVE_16_TO_16 (&temp16, buffer);

	/* Validate minimum descriptor length */

	if (temp16 < 6) {
		return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
	}

	*bytes_consumed = temp16 + 3;
	output_struct->id = ACPI_RSTYPE_EXT_IRQ;

	/*
	 * Point to the Byte3
	 */
	buffer += 2;
	temp8 = *buffer;

	output_struct->data.extended_irq.producer_consumer = temp8 & 0x01;

	/*
	 * Check for Interrupt Mode
	 *
	 * The definition of an Extended IRQ changed between ACPI spec v1.0b
	 * and ACPI spec 2.0 (section 6.4.3.6 in both).
	 *
	 * - Edge/Level are defined opposite in the table vs the headers
	 */
	output_struct->data.extended_irq.edge_level =
			   (temp8 & 0x2) ? ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;

	/*
	 * Check Interrupt Polarity
	 */
	output_struct->data.extended_irq.active_high_low = (temp8 >> 2) & 0x1;

	/*
	 * Check for sharable
	 */
	output_struct->data.extended_irq.shared_exclusive = (temp8 >> 3) & 0x01;

	/*
	 * Point to Byte4 (IRQ Table length)
	 */
	buffer += 1;
	temp8 = *buffer;

	/* Must have at least one IRQ */

	if (temp8 < 1) {
		return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
	}

	output_struct->data.extended_irq.number_of_interrupts = temp8;

	/*
	 * Add any additional structure size to properly calculate
	 * the next pointer at the end of this function
	 */
	struct_size += (temp8 - 1) * 4;

	/*
	 * Point to Byte5 (First IRQ Number)
	 */
	buffer += 1;

	/*
	 * Cycle through every IRQ in the table
	 */
	for (index = 0; index < temp8; index++) {
		ACPI_MOVE_32_TO_32 (
			&output_struct->data.extended_irq.interrupts[index], buffer);

		/* Point to the next IRQ */

		buffer += 4;
	}

	/*
	 * This will leave us pointing to the Resource Source Index
	 * If it is present, then save it off and calculate the
	 * pointer to where the null terminated string goes:
	 * Each Interrupt takes 32-bits + the 5 bytes of the
	 * stream that are default.
	 *
	 * Note: Some resource descriptors will have an additional null, so
	 * we add 1 to the length.
	 */
	if (*bytes_consumed >
		((acpi_size) output_struct->data.extended_irq.number_of_interrupts * 4) + (5 + 1)) {
		/* Dereference the Index */

		temp8 = *buffer;
		output_struct->data.extended_irq.resource_source.index = (u32) temp8;

		/* Point to the String */

		buffer += 1;

		/*
		 * Point the String pointer to the end of this structure.
		 */
		output_struct->data.extended_irq.resource_source.string_ptr =
				(char *)((char *) output_struct + struct_size);

		temp_ptr = (u8 *) output_struct->data.extended_irq.resource_source.string_ptr;

		/* Copy the string into the buffer */

		index = 0;
		while (0x00 != *buffer) {
			*temp_ptr = *buffer;

			temp_ptr += 1;
			buffer += 1;
			index += 1;
		}

		/*
		 * Add the terminating null
		 */
		*temp_ptr = 0x00;
		output_struct->data.extended_irq.resource_source.string_length = index + 1;

		/*
		 * In order for the struct_size to fall on a 32-bit boundary,
		 * calculate the length of the string and expand the
		 * struct_size to the next 32-bit boundary.
		 */
		temp8 = (u8) (index + 1);
		struct_size += ACPI_ROUND_UP_to_32_bITS (temp8);
	}
	else {
		output_struct->data.extended_irq.resource_source.index = 0x00;
		output_struct->data.extended_irq.resource_source.string_length = 0;
		output_struct->data.extended_irq.resource_source.string_ptr = NULL;
	}

	/*
	 * Set the Length parameter
	 */
	output_struct->length = (u32) struct_size;

	/*
	 * Return the final size of the structure
	 */
	*structure_size = struct_size;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_extended_irq_stream
 *
 * PARAMETERS:  linked_list             - Pointer to the resource linked list
 *              output_buffer           - Pointer to the user's return buffer
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        used in the output_buffer is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the linked list resource structure and fills in the
 *              the appropriate bytes in a byte stream
 *
 ******************************************************************************/

acpi_status
acpi_rs_extended_irq_stream (
	struct acpi_resource            *linked_list,
	u8                              **output_buffer,
	acpi_size                       *bytes_consumed)
{
	u8                              *buffer = *output_buffer;
	u16                             *length_field;
	u8                              temp8 = 0;
	u8                              index;
	char                            *temp_pointer = NULL;


	ACPI_FUNCTION_TRACE ("rs_extended_irq_stream");


	/*
	 * The descriptor field is static
	 */
	*buffer = 0x89;
	buffer += 1;

	/*
	 * Set a pointer to the Length field - to be filled in later
	 */
	length_field = ACPI_CAST_PTR (u16, buffer);
	buffer += 2;

	/*
	 * Set the Interrupt vector flags
	 */
	temp8 = (u8)(linked_list->data.extended_irq.producer_consumer & 0x01);
	temp8 |= ((linked_list->data.extended_irq.shared_exclusive & 0x01) << 3);

	/*
	 * Set the Interrupt Mode
	 *
	 * The definition of an Extended IRQ changed between ACPI spec v1.0b
	 * and ACPI spec 2.0 (section 6.4.3.6 in both).  This code does not
	 * implement the more restrictive definition of 1.0b
	 *
	 * - Edge/Level are defined opposite in the table vs the headers
	 */
	if (ACPI_EDGE_SENSITIVE == linked_list->data.extended_irq.edge_level) {
		temp8 |= 0x2;
	}

	/*
	 * Set the Interrupt Polarity
	 */
	temp8 |= ((linked_list->data.extended_irq.active_high_low & 0x1) << 2);

	*buffer = temp8;
	buffer += 1;

	/*
	 * Set the Interrupt table length
	 */
	temp8 = (u8) linked_list->data.extended_irq.number_of_interrupts;

	*buffer = temp8;
	buffer += 1;

	for (index = 0; index < linked_list->data.extended_irq.number_of_interrupts;
		 index++) {
		ACPI_MOVE_32_TO_32 (buffer,
				  &linked_list->data.extended_irq.interrupts[index]);
		buffer += 4;
	}

	/*
	 * Resource Source Index and Resource Source are optional
	 */
	if (0 != linked_list->data.extended_irq.resource_source.string_length) {
		*buffer = (u8) linked_list->data.extended_irq.resource_source.index;
		buffer += 1;

		temp_pointer = (char *) buffer;

		/*
		 * Copy the string
		 */
		ACPI_STRCPY (temp_pointer,
			linked_list->data.extended_irq.resource_source.string_ptr);

		/*
		 * Buffer needs to be set to the length of the sting + one for the
		 * terminating null
		 */
		buffer += (acpi_size)(ACPI_STRLEN (linked_list->data.extended_irq.resource_source.string_ptr) + 1);
	}

	/*
	 * Return the number of bytes consumed in this operation
	 */
	*bytes_consumed = ACPI_PTR_DIFF (buffer, *output_buffer);

	/*
	 * Set the length field to the number of bytes consumed
	 * minus the header size (3 bytes)
	 */
	*length_field = (u16) (*bytes_consumed - 3);
	return_ACPI_STATUS (AE_OK);
}