summaryrefslogtreecommitdiff
path: root/drivers/pnp/resource.c
blob: 64387b70026aadcc446d9344e16461362e880e0b (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
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
/*
 * resource.c - Contains functions for registering and analyzing resource information
 *
 * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/irq.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/init.h>

#include <linux/pnp.h>
#include "base.h"

static int pnp_reserve_irq[16] = {[0 ... 15] = -1 };	/* reserve (don't use) some IRQ */
static int pnp_reserve_dma[8] = {[0 ... 7] = -1 };	/* reserve (don't use) some DMA */
static int pnp_reserve_io[16] = {[0 ... 15] = -1 };	/* reserve (don't use) some I/O region */
static int pnp_reserve_mem[16] = {[0 ... 15] = -1 };	/* reserve (don't use) some memory region */

/*
 * option registration
 */

static struct pnp_option *pnp_build_option(int priority)
{
	struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));

	if (!option)
		return NULL;

	option->priority = priority & 0xff;
	/* make sure the priority is valid */
	if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL)
		option->priority = PNP_RES_PRIORITY_INVALID;

	return option;
}

struct pnp_option *pnp_register_independent_option(struct pnp_dev *dev)
{
	struct pnp_option *option;

	option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);

	/* this should never happen but if it does we'll try to continue */
	if (dev->independent)
		dev_err(&dev->dev, "independent resource already registered\n");
	dev->independent = option;

	dev_dbg(&dev->dev, "new independent option\n");
	return option;
}

struct pnp_option *pnp_register_dependent_option(struct pnp_dev *dev,
						 int priority)
{
	struct pnp_option *option;

	option = pnp_build_option(priority);

	if (dev->dependent) {
		struct pnp_option *parent = dev->dependent;
		while (parent->next)
			parent = parent->next;
		parent->next = option;
	} else
		dev->dependent = option;

	dev_dbg(&dev->dev, "new dependent option (priority %#x)\n", priority);
	return option;
}

int pnp_register_irq_resource(struct pnp_dev *dev, struct pnp_option *option,
			      struct pnp_irq *data)
{
	struct pnp_irq *ptr;
#ifdef DEBUG
	char buf[PNP_IRQ_NR];   /* hex-encoded, so this is overkill but safe */
#endif

	ptr = option->irq;
	while (ptr && ptr->next)
		ptr = ptr->next;
	if (ptr)
		ptr->next = data;
	else
		option->irq = data;

#ifdef CONFIG_PCI
	{
		int i;

		for (i = 0; i < 16; i++)
			if (test_bit(i, data->map))
				pcibios_penalize_isa_irq(i, 0);
	}
#endif

#ifdef DEBUG
	bitmap_scnprintf(buf, sizeof(buf), data->map, PNP_IRQ_NR);
	dev_dbg(&dev->dev, "  irq bitmask %s flags %#x\n", buf,
		data->flags);
#endif
	return 0;
}

int pnp_register_dma_resource(struct pnp_dev *dev, struct pnp_option *option,
			      struct pnp_dma *data)
{
	struct pnp_dma *ptr;

	ptr = option->dma;
	while (ptr && ptr->next)
		ptr = ptr->next;
	if (ptr)
		ptr->next = data;
	else
		option->dma = data;

	dev_dbg(&dev->dev, "  dma bitmask %#x flags %#x\n", data->map,
		data->flags);
	return 0;
}

int pnp_register_port_resource(struct pnp_dev *dev, struct pnp_option *option,
			       struct pnp_port *data)
{
	struct pnp_port *ptr;

	ptr = option->port;
	while (ptr && ptr->next)
		ptr = ptr->next;
	if (ptr)
		ptr->next = data;
	else
		option->port = data;

	dev_dbg(&dev->dev, "  io  "
		"min %#x max %#x align %d size %d flags %#x\n",
		data->min, data->max, data->align, data->size, data->flags);
	return 0;
}

int pnp_register_mem_resource(struct pnp_dev *dev, struct pnp_option *option,
			      struct pnp_mem *data)
{
	struct pnp_mem *ptr;

	ptr = option->mem;
	while (ptr && ptr->next)
		ptr = ptr->next;
	if (ptr)
		ptr->next = data;
	else
		option->mem = data;

	dev_dbg(&dev->dev, "  mem "
		"min %#x max %#x align %d size %d flags %#x\n",
		data->min, data->max, data->align, data->size, data->flags);
	return 0;
}

static void pnp_free_port(struct pnp_port *port)
{
	struct pnp_port *next;

	while (port) {
		next = port->next;
		kfree(port);
		port = next;
	}
}

static void pnp_free_irq(struct pnp_irq *irq)
{
	struct pnp_irq *next;

	while (irq) {
		next = irq->next;
		kfree(irq);
		irq = next;
	}
}

static void pnp_free_dma(struct pnp_dma *dma)
{
	struct pnp_dma *next;

	while (dma) {
		next = dma->next;
		kfree(dma);
		dma = next;
	}
}

static void pnp_free_mem(struct pnp_mem *mem)
{
	struct pnp_mem *next;

	while (mem) {
		next = mem->next;
		kfree(mem);
		mem = next;
	}
}

void pnp_free_option(struct pnp_option *option)
{
	struct pnp_option *next;

	while (option) {
		next = option->next;
		pnp_free_port(option->port);
		pnp_free_irq(option->irq);
		pnp_free_dma(option->dma);
		pnp_free_mem(option->mem);
		kfree(option);
		option = next;
	}
}

/*
 * resource validity checking
 */

#define length(start, end) (*(end) - *(start) + 1)

/* Two ranges conflict if one doesn't end before the other starts */
#define ranged_conflict(starta, enda, startb, endb) \
	!((*(enda) < *(startb)) || (*(endb) < *(starta)))

#define cannot_compare(flags) \
((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))

int pnp_check_port(struct pnp_dev *dev, struct resource *res)
{
	int i;
	struct pnp_dev *tdev;
	struct resource *tres;
	resource_size_t *port, *end, *tport, *tend;

	port = &res->start;
	end = &res->end;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(res->flags))
		return 1;

	/* check if the resource is already in use, skip if the
	 * device is active because it itself may be in use */
	if (!dev->active) {
		if (__check_region(&ioport_resource, *port, length(port, end)))
			return 0;
	}

	/* check if the resource is reserved */
	for (i = 0; i < 8; i++) {
		int rport = pnp_reserve_io[i << 1];
		int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
		if (ranged_conflict(port, end, &rport, &rend))
			return 0;
	}

	/* check for internal conflicts */
	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
		if (tres != res && tres->flags & IORESOURCE_IO) {
			tport = &tres->start;
			tend = &tres->end;
			if (ranged_conflict(port, end, tport, tend))
				return 0;
		}
	}

	/* check for conflicts with other pnp devices */
	pnp_for_each_dev(tdev) {
		if (tdev == dev)
			continue;
		for (i = 0;
		     (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
		     i++) {
			if (tres->flags & IORESOURCE_IO) {
				if (cannot_compare(tres->flags))
					continue;
				tport = &tres->start;
				tend = &tres->end;
				if (ranged_conflict(port, end, tport, tend))
					return 0;
			}
		}
	}

	return 1;
}

int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
{
	int i;
	struct pnp_dev *tdev;
	struct resource *tres;
	resource_size_t *addr, *end, *taddr, *tend;

	addr = &res->start;
	end = &res->end;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(res->flags))
		return 1;

	/* check if the resource is already in use, skip if the
	 * device is active because it itself may be in use */
	if (!dev->active) {
		if (check_mem_region(*addr, length(addr, end)))
			return 0;
	}

	/* check if the resource is reserved */
	for (i = 0; i < 8; i++) {
		int raddr = pnp_reserve_mem[i << 1];
		int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
		if (ranged_conflict(addr, end, &raddr, &rend))
			return 0;
	}

	/* check for internal conflicts */
	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
		if (tres != res && tres->flags & IORESOURCE_MEM) {
			taddr = &tres->start;
			tend = &tres->end;
			if (ranged_conflict(addr, end, taddr, tend))
				return 0;
		}
	}

	/* check for conflicts with other pnp devices */
	pnp_for_each_dev(tdev) {
		if (tdev == dev)
			continue;
		for (i = 0;
		     (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
		     i++) {
			if (tres->flags & IORESOURCE_MEM) {
				if (cannot_compare(tres->flags))
					continue;
				taddr = &tres->start;
				tend = &tres->end;
				if (ranged_conflict(addr, end, taddr, tend))
					return 0;
			}
		}
	}

	return 1;
}

static irqreturn_t pnp_test_handler(int irq, void *dev_id)
{
	return IRQ_HANDLED;
}

int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
{
	int i;
	struct pnp_dev *tdev;
	struct resource *tres;
	resource_size_t *irq;

	irq = &res->start;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(res->flags))
		return 1;

	/* check if the resource is valid */
	if (*irq < 0 || *irq > 15)
		return 0;

	/* check if the resource is reserved */
	for (i = 0; i < 16; i++) {
		if (pnp_reserve_irq[i] == *irq)
			return 0;
	}

	/* check for internal conflicts */
	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
		if (tres != res && tres->flags & IORESOURCE_IRQ) {
			if (tres->start == *irq)
				return 0;
		}
	}

#ifdef CONFIG_PCI
	/* check if the resource is being used by a pci device */
	{
		struct pci_dev *pci = NULL;
		for_each_pci_dev(pci) {
			if (pci->irq == *irq) {
				pci_dev_put(pci);
				return 0;
			}
		}
	}
#endif

	/* check if the resource is already in use, skip if the
	 * device is active because it itself may be in use */
	if (!dev->active) {
		if (request_irq(*irq, pnp_test_handler,
				IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
			return 0;
		free_irq(*irq, NULL);
	}

	/* check for conflicts with other pnp devices */
	pnp_for_each_dev(tdev) {
		if (tdev == dev)
			continue;
		for (i = 0;
		     (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
		     i++) {
			if (tres->flags & IORESOURCE_IRQ) {
				if (cannot_compare(tres->flags))
					continue;
				if (tres->start == *irq)
					return 0;
			}
		}
	}

	return 1;
}

int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
{
#ifndef CONFIG_IA64
	int i;
	struct pnp_dev *tdev;
	struct resource *tres;
	resource_size_t *dma;

	dma = &res->start;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(res->flags))
		return 1;

	/* check if the resource is valid */
	if (*dma < 0 || *dma == 4 || *dma > 7)
		return 0;

	/* check if the resource is reserved */
	for (i = 0; i < 8; i++) {
		if (pnp_reserve_dma[i] == *dma)
			return 0;
	}

	/* check for internal conflicts */
	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
		if (tres != res && tres->flags & IORESOURCE_DMA) {
			if (tres->start == *dma)
				return 0;
		}
	}

	/* check if the resource is already in use, skip if the
	 * device is active because it itself may be in use */
	if (!dev->active) {
		if (request_dma(*dma, "pnp"))
			return 0;
		free_dma(*dma);
	}

	/* check for conflicts with other pnp devices */
	pnp_for_each_dev(tdev) {
		if (tdev == dev)
			continue;
		for (i = 0;
		     (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
		     i++) {
			if (tres->flags & IORESOURCE_DMA) {
				if (cannot_compare(tres->flags))
					continue;
				if (tres->start == *dma)
					return 0;
			}
		}
	}

	return 1;
#else
	/* IA64 does not have legacy DMA */
	return 0;
#endif
}

struct pnp_resource *pnp_get_pnp_resource(struct pnp_dev *dev,
					  unsigned int type, unsigned int num)
{
	struct pnp_resource_table *res = dev->res;

	switch (type) {
	case IORESOURCE_IO:
		if (num >= PNP_MAX_PORT)
			return NULL;
		return &res->port[num];
	case IORESOURCE_MEM:
		if (num >= PNP_MAX_MEM)
			return NULL;
		return &res->mem[num];
	case IORESOURCE_IRQ:
		if (num >= PNP_MAX_IRQ)
			return NULL;
		return &res->irq[num];
	case IORESOURCE_DMA:
		if (num >= PNP_MAX_DMA)
			return NULL;
		return &res->dma[num];
	}
	return NULL;
}

struct resource *pnp_get_resource(struct pnp_dev *dev,
				  unsigned int type, unsigned int num)
{
	struct pnp_resource *pnp_res;

	pnp_res = pnp_get_pnp_resource(dev, type, num);
	if (pnp_res)
		return &pnp_res->res;

	return NULL;
}
EXPORT_SYMBOL(pnp_get_resource);

static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev, int type)
{
	struct pnp_resource *pnp_res;
	int i;

	switch (type) {
	case IORESOURCE_IO:
		for (i = 0; i < PNP_MAX_PORT; i++) {
			pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IO, i);
			if (pnp_res && !pnp_resource_valid(&pnp_res->res))
				return pnp_res;
		}
		break;
	case IORESOURCE_MEM:
		for (i = 0; i < PNP_MAX_MEM; i++) {
			pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_MEM, i);
			if (pnp_res && !pnp_resource_valid(&pnp_res->res))
				return pnp_res;
		}
		break;
	case IORESOURCE_IRQ:
		for (i = 0; i < PNP_MAX_IRQ; i++) {
			pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IRQ, i);
			if (pnp_res && !pnp_resource_valid(&pnp_res->res))
				return pnp_res;
		}
		break;
	case IORESOURCE_DMA:
		for (i = 0; i < PNP_MAX_DMA; i++) {
			pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_DMA, i);
			if (pnp_res && !pnp_resource_valid(&pnp_res->res))
				return pnp_res;
		}
		break;
	}
	return NULL;
}

struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
					  int flags)
{
	struct pnp_resource *pnp_res;
	struct resource *res;
	static unsigned char warned;

	pnp_res = pnp_new_resource(dev, IORESOURCE_IRQ);
	if (!pnp_res) {
		if (!warned) {
			dev_err(&dev->dev, "can't add resource for IRQ %d\n",
				irq);
			warned = 1;
		}
		return NULL;
	}

	res = &pnp_res->res;
	res->flags = IORESOURCE_IRQ | flags;
	res->start = irq;
	res->end = irq;

	dev_dbg(&dev->dev, "  add irq %d flags %#x\n", irq, flags);
	return pnp_res;
}

struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
					  int flags)
{
	struct pnp_resource *pnp_res;
	struct resource *res;
	static unsigned char warned;

	pnp_res = pnp_new_resource(dev, IORESOURCE_DMA);
	if (!pnp_res) {
		if (!warned) {
			dev_err(&dev->dev, "can't add resource for DMA %d\n",
				dma);
			warned = 1;
		}
		return NULL;
	}

	res = &pnp_res->res;
	res->flags = IORESOURCE_DMA | flags;
	res->start = dma;
	res->end = dma;

	dev_dbg(&dev->dev, "  add dma %d flags %#x\n", dma, flags);
	return pnp_res;
}

struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
					 resource_size_t start,
					 resource_size_t end, int flags)
{
	struct pnp_resource *pnp_res;
	struct resource *res;
	static unsigned char warned;

	pnp_res = pnp_new_resource(dev, IORESOURCE_IO);
	if (!pnp_res) {
		if (!warned) {
			dev_err(&dev->dev, "can't add resource for IO "
				"%#llx-%#llx\n",(unsigned long long) start,
				(unsigned long long) end);
			warned = 1;
		}
		return NULL;
	}

	res = &pnp_res->res;
	res->flags = IORESOURCE_IO | flags;
	res->start = start;
	res->end = end;

	dev_dbg(&dev->dev, "  add io  %#llx-%#llx flags %#x\n",
		(unsigned long long) start, (unsigned long long) end, flags);
	return pnp_res;
}

/* format is: pnp_reserve_irq=irq1[,irq2] .... */
static int __init pnp_setup_reserve_irq(char *str)
{
	int i;

	for (i = 0; i < 16; i++)
		if (get_option(&str, &pnp_reserve_irq[i]) != 2)
			break;
	return 1;
}

__setup("pnp_reserve_irq=", pnp_setup_reserve_irq);

/* format is: pnp_reserve_dma=dma1[,dma2] .... */
static int __init pnp_setup_reserve_dma(char *str)
{
	int i;

	for (i = 0; i < 8; i++)
		if (get_option(&str, &pnp_reserve_dma[i]) != 2)
			break;
	return 1;
}

__setup("pnp_reserve_dma=", pnp_setup_reserve_dma);

/* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
static int __init pnp_setup_reserve_io(char *str)
{
	int i;

	for (i = 0; i < 16; i++)
		if (get_option(&str, &pnp_reserve_io[i]) != 2)
			break;
	return 1;
}

__setup("pnp_reserve_io=", pnp_setup_reserve_io);

/* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
static int __init pnp_setup_reserve_mem(char *str)
{
	int i;

	for (i = 0; i < 16; i++)
		if (get_option(&str, &pnp_reserve_mem[i]) != 2)
			break;
	return 1;
}

__setup("pnp_reserve_mem=", pnp_setup_reserve_mem);