aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/resource.c
blob: 0bdacc5e26a3b9411b82a5fe4772c2c9f9b7d490 (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
/*
 * drivers/acpi/resource.c - ACPI device resources interpretation.
 *
 * Copyright (C) 2012, Intel Corp.
 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/ioport.h>
#include <linux/slab.h>

#ifdef CONFIG_X86
#define valid_IRQ(i) (((i) != 0) && ((i) != 2))
#else
#define valid_IRQ(i) (true)
#endif

static unsigned long acpi_dev_memresource_flags(u64 len, u8 write_protect,
						bool window)
{
	unsigned long flags = IORESOURCE_MEM;

	if (len == 0)
		flags |= IORESOURCE_DISABLED;

	if (write_protect == ACPI_READ_WRITE_MEMORY)
		flags |= IORESOURCE_MEM_WRITEABLE;

	if (window)
		flags |= IORESOURCE_WINDOW;

	return flags;
}

static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len,
				     u8 write_protect)
{
	res->start = start;
	res->end = start + len - 1;
	res->flags = acpi_dev_memresource_flags(len, write_protect, false);
}

/**
 * acpi_dev_resource_memory - Extract ACPI memory resource information.
 * @ares: Input ACPI resource object.
 * @res: Output generic resource object.
 *
 * Check if the given ACPI resource object represents a memory resource and
 * if that's the case, use the information in it to populate the generic
 * resource object pointed to by @res.
 */
bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
{
	struct acpi_resource_memory24 *memory24;
	struct acpi_resource_memory32 *memory32;
	struct acpi_resource_fixed_memory32 *fixed_memory32;

	switch (ares->type) {
	case ACPI_RESOURCE_TYPE_MEMORY24:
		memory24 = &ares->data.memory24;
		if (!memory24->address_length)
			return false;
		acpi_dev_get_memresource(res, memory24->minimum,
					 memory24->address_length,
					 memory24->write_protect);
		break;
	case ACPI_RESOURCE_TYPE_MEMORY32:
		memory32 = &ares->data.memory32;
		if (!memory32->address_length)
			return false;
		acpi_dev_get_memresource(res, memory32->minimum,
					 memory32->address_length,
					 memory32->write_protect);
		break;
	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
		fixed_memory32 = &ares->data.fixed_memory32;
		if (!fixed_memory32->address_length)
			return false;
		acpi_dev_get_memresource(res, fixed_memory32->address,
					 fixed_memory32->address_length,
					 fixed_memory32->write_protect);
		break;
	default:
		return false;
	}
	return true;
}
EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);

static unsigned int acpi_dev_ioresource_flags(u64 start, u64 end, u8 io_decode,
					      bool window)
{
	int flags = IORESOURCE_IO;

	if (io_decode == ACPI_DECODE_16)
		flags |= IORESOURCE_IO_16BIT_ADDR;

	if (start > end || end >= 0x10003)
		flags |= IORESOURCE_DISABLED;

	if (window)
		flags |= IORESOURCE_WINDOW;

	return flags;
}

static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
				    u8 io_decode)
{
	u64 end = start + len - 1;

	res->start = start;
	res->end = end;
	res->flags = acpi_dev_ioresource_flags(start, end, io_decode, false);
}

/**
 * acpi_dev_resource_io - Extract ACPI I/O resource information.
 * @ares: Input ACPI resource object.
 * @res: Output generic resource object.
 *
 * Check if the given ACPI resource object represents an I/O resource and
 * if that's the case, use the information in it to populate the generic
 * resource object pointed to by @res.
 */
bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
{
	struct acpi_resource_io *io;
	struct acpi_resource_fixed_io *fixed_io;

	switch (ares->type) {
	case ACPI_RESOURCE_TYPE_IO:
		io = &ares->data.io;
		if (!io->address_length)
			return false;
		acpi_dev_get_ioresource(res, io->minimum,
					io->address_length,
					io->io_decode);
		break;
	case ACPI_RESOURCE_TYPE_FIXED_IO:
		fixed_io = &ares->data.fixed_io;
		if (!fixed_io->address_length)
			return false;
		acpi_dev_get_ioresource(res, fixed_io->address,
					fixed_io->address_length,
					ACPI_DECODE_10);
		break;
	default:
		return false;
	}
	return true;
}
EXPORT_SYMBOL_GPL(acpi_dev_resource_io);

/**
 * acpi_dev_resource_address_space - Extract ACPI address space information.
 * @ares: Input ACPI resource object.
 * @res: Output generic resource object.
 *
 * Check if the given ACPI resource object represents an address space resource
 * and if that's the case, use the information in it to populate the generic
 * resource object pointed to by @res.
 */
bool acpi_dev_resource_address_space(struct acpi_resource *ares,
				     struct resource *res)
{
	acpi_status status;
	struct acpi_resource_address64 addr;
	bool window;
	u64 len;
	u8 io_decode;

	switch (ares->type) {
	case ACPI_RESOURCE_TYPE_ADDRESS16:
	case ACPI_RESOURCE_TYPE_ADDRESS32:
	case ACPI_RESOURCE_TYPE_ADDRESS64:
		break;
	default:
		return false;
	}

	status = acpi_resource_to_address64(ares, &addr);
	if (ACPI_FAILURE(status))
		return true;

	res->start = addr.minimum;
	res->end = addr.maximum;
	window = addr.producer_consumer == ACPI_PRODUCER;

	switch(addr.resource_type) {
	case ACPI_MEMORY_RANGE:
		len = addr.maximum - addr.minimum + 1;
		res->flags = acpi_dev_memresource_flags(len,
						addr.info.mem.write_protect,
						window);
		break;
	case ACPI_IO_RANGE:
		io_decode = addr.granularity == 0xfff ?
				ACPI_DECODE_10 : ACPI_DECODE_16;
		res->flags = acpi_dev_ioresource_flags(addr.minimum,
						       addr.maximum,
						       io_decode, window);
		break;
	case ACPI_BUS_NUMBER_RANGE:
		res->flags = IORESOURCE_BUS;
		break;
	default:
		res->flags = 0;
	}

	return true;
}
EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);

/**
 * acpi_dev_resource_ext_address_space - Extract ACPI address space information.
 * @ares: Input ACPI resource object.
 * @res: Output generic resource object.
 *
 * Check if the given ACPI resource object represents an extended address space
 * resource and if that's the case, use the information in it to populate the
 * generic resource object pointed to by @res.
 */
bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
					 struct resource *res)
{
	struct acpi_resource_extended_address64 *ext_addr;
	bool window;
	u64 len;
	u8 io_decode;

	if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
		return false;

	ext_addr = &ares->data.ext_address64;

	res->start = ext_addr->minimum;
	res->end = ext_addr->maximum;
	window = ext_addr->producer_consumer == ACPI_PRODUCER;

	switch(ext_addr->resource_type) {
	case ACPI_MEMORY_RANGE:
		len = ext_addr->maximum - ext_addr->minimum + 1;
		res->flags = acpi_dev_memresource_flags(len,
					ext_addr->info.mem.write_protect,
					window);
		break;
	case ACPI_IO_RANGE:
		io_decode = ext_addr->granularity == 0xfff ?
				ACPI_DECODE_10 : ACPI_DECODE_16;
		res->flags = acpi_dev_ioresource_flags(ext_addr->minimum,
						       ext_addr->maximum,
						       io_decode, window);
		break;
	case ACPI_BUS_NUMBER_RANGE:
		res->flags = IORESOURCE_BUS;
		break;
	default:
		res->flags = 0;
	}

	return true;
}
EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);

/**
 * acpi_dev_irq_flags - Determine IRQ resource flags.
 * @triggering: Triggering type as provided by ACPI.
 * @polarity: Interrupt polarity as provided by ACPI.
 * @shareable: Whether or not the interrupt is shareable.
 */
unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
{
	unsigned long flags;

	if (triggering == ACPI_LEVEL_SENSITIVE)
		flags = polarity == ACPI_ACTIVE_LOW ?
			IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
	else
		flags = polarity == ACPI_ACTIVE_LOW ?
			IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;

	if (shareable == ACPI_SHARED)
		flags |= IORESOURCE_IRQ_SHAREABLE;

	return flags | IORESOURCE_IRQ;
}
EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);

static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi)
{
	res->start = gsi;
	res->end = gsi;
	res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED;
}

static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
				     u8 triggering, u8 polarity, u8 shareable,
				     bool legacy)
{
	int irq, p, t;

	if (!valid_IRQ(gsi)) {
		acpi_dev_irqresource_disabled(res, gsi);
		return;
	}

	/*
	 * In IO-APIC mode, use overrided attribute. Two reasons:
	 * 1. BIOS bug in DSDT
	 * 2. BIOS uses IO-APIC mode Interrupt Source Override
	 *
	 * We do this only if we are dealing with IRQ() or IRQNoFlags()
	 * resource (the legacy ISA resources). With modern ACPI 5 devices
	 * using extended IRQ descriptors we take the IRQ configuration
	 * from _CRS directly.
	 */
	if (legacy && !acpi_get_override_irq(gsi, &t, &p)) {
		u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
		u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;

		if (triggering != trig || polarity != pol) {
			pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi,
				   t ? "level" : "edge", p ? "low" : "high");
			triggering = trig;
			polarity = pol;
		}
	}

	res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
	irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
	if (irq >= 0) {
		res->start = irq;
		res->end = irq;
	} else {
		acpi_dev_irqresource_disabled(res, gsi);
	}
}

/**
 * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
 * @ares: Input ACPI resource object.
 * @index: Index into the array of GSIs represented by the resource.
 * @res: Output generic resource object.
 *
 * Check if the given ACPI resource object represents an interrupt resource
 * and @index does not exceed the resource's interrupt count (true is returned
 * in that case regardless of the results of the other checks)).  If that's the
 * case, register the GSI corresponding to @index from the array of interrupts
 * represented by the resource and populate the generic resource object pointed
 * to by @res accordingly.  If the registration of the GSI is not successful,
 * IORESOURCE_DISABLED will be set it that object's flags.
 */
bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
				 struct resource *res)
{
	struct acpi_resource_irq *irq;
	struct acpi_resource_extended_irq *ext_irq;

	switch (ares->type) {
	case ACPI_RESOURCE_TYPE_IRQ:
		/*
		 * Per spec, only one interrupt per descriptor is allowed in
		 * _CRS, but some firmware violates this, so parse them all.
		 */
		irq = &ares->data.irq;
		if (index >= irq->interrupt_count) {
			acpi_dev_irqresource_disabled(res, 0);
			return false;
		}
		acpi_dev_get_irqresource(res, irq->interrupts[index],
					 irq->triggering, irq->polarity,
					 irq->sharable, true);
		break;
	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
		ext_irq = &ares->data.extended_irq;
		if (index >= ext_irq->interrupt_count) {
			acpi_dev_irqresource_disabled(res, 0);
			return false;
		}
		acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
					 ext_irq->triggering, ext_irq->polarity,
					 ext_irq->sharable, false);
		break;
	default:
		return false;
	}

	return true;
}
EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);

/**
 * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
 * @list: The head of the resource list to free.
 */
void acpi_dev_free_resource_list(struct list_head *list)
{
	struct resource_list_entry *rentry, *re;

	list_for_each_entry_safe(rentry, re, list, node) {
		list_del(&rentry->node);
		kfree(rentry);
	}
}
EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);

struct res_proc_context {
	struct list_head *list;
	int (*preproc)(struct acpi_resource *, void *);
	void *preproc_data;
	int count;
	int error;
};

static acpi_status acpi_dev_new_resource_entry(struct resource *r,
					       struct res_proc_context *c)
{
	struct resource_list_entry *rentry;

	rentry = kmalloc(sizeof(*rentry), GFP_KERNEL);
	if (!rentry) {
		c->error = -ENOMEM;
		return AE_NO_MEMORY;
	}
	rentry->res = *r;
	list_add_tail(&rentry->node, c->list);
	c->count++;
	return AE_OK;
}

static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
					     void *context)
{
	struct res_proc_context *c = context;
	struct resource r;
	int i;

	if (c->preproc) {
		int ret;

		ret = c->preproc(ares, c->preproc_data);
		if (ret < 0) {
			c->error = ret;
			return AE_CTRL_TERMINATE;
		} else if (ret > 0) {
			return AE_OK;
		}
	}

	memset(&r, 0, sizeof(r));

	if (acpi_dev_resource_memory(ares, &r)
	    || acpi_dev_resource_io(ares, &r)
	    || acpi_dev_resource_address_space(ares, &r)
	    || acpi_dev_resource_ext_address_space(ares, &r))
		return acpi_dev_new_resource_entry(&r, c);

	for (i = 0; acpi_dev_resource_interrupt(ares, i, &r); i++) {
		acpi_status status;

		status = acpi_dev_new_resource_entry(&r, c);
		if (ACPI_FAILURE(status))
			return status;
	}

	return AE_OK;
}

/**
 * acpi_dev_get_resources - Get current resources of a device.
 * @adev: ACPI device node to get the resources for.
 * @list: Head of the resultant list of resources (must be empty).
 * @preproc: The caller's preprocessing routine.
 * @preproc_data: Pointer passed to the caller's preprocessing routine.
 *
 * Evaluate the _CRS method for the given device node and process its output by
 * (1) executing the @preproc() rountine provided by the caller, passing the
 * resource pointer and @preproc_data to it as arguments, for each ACPI resource
 * returned and (2) converting all of the returned ACPI resources into struct
 * resource objects if possible.  If the return value of @preproc() in step (1)
 * is different from 0, step (2) is not applied to the given ACPI resource and
 * if that value is negative, the whole processing is aborted and that value is
 * returned as the final error code.
 *
 * The resultant struct resource objects are put on the list pointed to by
 * @list, that must be empty initially, as members of struct resource_list_entry
 * objects.  Callers of this routine should use %acpi_dev_free_resource_list() to
 * free that list.
 *
 * The number of resources in the output list is returned on success, an error
 * code reflecting the error condition is returned otherwise.
 */
int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
			   int (*preproc)(struct acpi_resource *, void *),
			   void *preproc_data)
{
	struct res_proc_context c;
	acpi_status status;

	if (!adev || !adev->handle || !list_empty(list))
		return -EINVAL;

	if (!acpi_has_method(adev->handle, METHOD_NAME__CRS))
		return 0;

	c.list = list;
	c.preproc = preproc;
	c.preproc_data = preproc_data;
	c.count = 0;
	c.error = 0;
	status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
				     acpi_dev_process_resource, &c);
	if (ACPI_FAILURE(status)) {
		acpi_dev_free_resource_list(list);
		return c.error ? c.error : -EIO;
	}

	return c.count;
}
EXPORT_SYMBOL_GPL(acpi_dev_get_resources);