aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pcmcia/pcmcia_resource.c
blob: 563750e77eaf0c69319a26e6bb9b51516163aefe (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
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
/*
 * PCMCIA 16-bit resource management functions
 *
 * The initial developer of the original code is David A. Hinds
 * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * Copyright (C) 1999	     David A. Hinds
 * Copyright (C) 2004-2005   Dominik Brodowski
 *
 * 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.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/slab.h>

#include <asm/irq.h>

#include <pcmcia/ss.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>

#include "cs_internal.h"


/* Access speed for IO windows */
static int io_speed;
module_param(io_speed, int, 0444);


int pcmcia_validate_mem(struct pcmcia_socket *s)
{
	if (s->resource_ops->validate_mem)
		return s->resource_ops->validate_mem(s);
	/* if there is no callback, we can assume that everything is OK */
	return 0;
}

struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
				 int low, struct pcmcia_socket *s)
{
	if (s->resource_ops->find_mem)
		return s->resource_ops->find_mem(base, num, align, low, s);
	return NULL;
}


/** alloc_io_space
 *
 * Special stuff for managing IO windows, because they are scarce
 */

static int alloc_io_space(struct pcmcia_socket *s, u_int attr,
			  unsigned int *base, unsigned int num, u_int lines)
{
	unsigned int align;

	align = (*base) ? (lines ? 1<<lines : 0) : 1;
	if (align && (align < num)) {
		if (*base) {
			dev_dbg(&s->dev, "odd IO request: num %#x align %#x\n",
			       num, align);
			align = 0;
		} else
			while (align && (align < num))
				align <<= 1;
	}
	if (*base & ~(align-1)) {
		dev_dbg(&s->dev, "odd IO request: base %#x align %#x\n",
		       *base, align);
		align = 0;
	}

	return s->resource_ops->find_io(s, attr, base, num, align);
} /* alloc_io_space */


static void release_io_space(struct pcmcia_socket *s, unsigned int base,
			     unsigned int num)
{
	int i;

	for (i = 0; i < MAX_IO_WIN; i++) {
		if (!s->io[i].res)
			continue;
		if ((s->io[i].res->start <= base) &&
		    (s->io[i].res->end >= base+num-1)) {
			s->io[i].InUse -= num;
			/* Free the window if no one else is using it */
			if (s->io[i].InUse == 0) {
				release_resource(s->io[i].res);
				kfree(s->io[i].res);
				s->io[i].res = NULL;
			}
		}
	}
} /* release_io_space */


/**
 * pcmcia_access_config() - read or write card configuration registers
 *
 * pcmcia_access_config() reads and writes configuration registers in
 * attribute memory.  Memory window 0 is reserved for this and the tuple
 * reading services. Drivers must use pcmcia_read_config_byte() or
 * pcmcia_write_config_byte().
 */
static int pcmcia_access_config(struct pcmcia_device *p_dev,
				off_t where, u8 *val,
				int (*accessf) (struct pcmcia_socket *s,
						int attr, unsigned int addr,
						unsigned int len, void *ptr))
{
	struct pcmcia_socket *s;
	config_t *c;
	int addr;
	int ret = 0;

	s = p_dev->socket;

	mutex_lock(&s->ops_mutex);
	c = p_dev->function_config;

	if (!(c->state & CONFIG_LOCKED)) {
		dev_dbg(&s->dev, "Configuration isnt't locked\n");
		mutex_unlock(&s->ops_mutex);
		return -EACCES;
	}

	addr = (c->ConfigBase + where) >> 1;

	ret = accessf(s, 1, addr, 1, val);

	mutex_unlock(&s->ops_mutex);

	return ret;
} /* pcmcia_access_config */


/**
 * pcmcia_read_config_byte() - read a byte from a card configuration register
 *
 * pcmcia_read_config_byte() reads a byte from a configuration register in
 * attribute memory.
 */
int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val)
{
	return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem);
}
EXPORT_SYMBOL(pcmcia_read_config_byte);


/**
 * pcmcia_write_config_byte() - write a byte to a card configuration register
 *
 * pcmcia_write_config_byte() writes a byte to a configuration register in
 * attribute memory.
 */
int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val)
{
	return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem);
}
EXPORT_SYMBOL(pcmcia_write_config_byte);


int pcmcia_map_mem_page(struct pcmcia_device *p_dev, window_handle_t wh,
			memreq_t *req)
{
	struct pcmcia_socket *s = p_dev->socket;
	int ret;

	wh--;
	if (wh >= MAX_WIN)
		return -EINVAL;
	if (req->Page != 0) {
		dev_dbg(&s->dev, "failure: requested page is zero\n");
		return -EINVAL;
	}
	mutex_lock(&s->ops_mutex);
	s->win[wh].card_start = req->CardOffset;
	ret = s->ops->set_mem_map(s, &s->win[wh]);
	if (ret)
		dev_warn(&s->dev, "failed to set_mem_map\n");
	mutex_unlock(&s->ops_mutex);
	return ret;
} /* pcmcia_map_mem_page */
EXPORT_SYMBOL(pcmcia_map_mem_page);


/** pcmcia_modify_configuration
 *
 * Modify a locked socket configuration
 */
int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
				modconf_t *mod)
{
	struct pcmcia_socket *s;
	config_t *c;
	int ret;

	s = p_dev->socket;

	mutex_lock(&s->ops_mutex);
	c = p_dev->function_config;

	if (!(s->state & SOCKET_PRESENT)) {
		dev_dbg(&s->dev, "No card present\n");
		ret = -ENODEV;
		goto unlock;
	}
	if (!(c->state & CONFIG_LOCKED)) {
		dev_dbg(&s->dev, "Configuration isnt't locked\n");
		ret = -EACCES;
		goto unlock;
	}

	if (mod->Attributes & (CONF_IRQ_CHANGE_VALID | CONF_VCC_CHANGE_VALID)) {
		dev_dbg(&s->dev,
			"changing Vcc or IRQ is not allowed at this time\n");
		ret = -EINVAL;
		goto unlock;
	}

	/* We only allow changing Vpp1 and Vpp2 to the same value */
	if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) &&
	    (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
		if (mod->Vpp1 != mod->Vpp2) {
			dev_dbg(&s->dev, "Vpp1 and Vpp2 must be the same\n");
			ret = -EINVAL;
			goto unlock;
		}
		s->socket.Vpp = mod->Vpp1;
		if (s->ops->set_socket(s, &s->socket)) {
			dev_printk(KERN_WARNING, &s->dev,
				   "Unable to set VPP\n");
			ret = -EIO;
			goto unlock;
		}
	} else if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) ||
		   (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
		dev_dbg(&s->dev, "changing Vcc is not allowed at this time\n");
		ret = -EINVAL;
		goto unlock;
	}

	if (mod->Attributes & CONF_IO_CHANGE_WIDTH) {
		pccard_io_map io_off = { 0, 0, 0, 0, 1 };
		pccard_io_map io_on;
		int i;

		io_on.speed = io_speed;
		for (i = 0; i < MAX_IO_WIN; i++) {
			if (!s->io[i].res)
				continue;
			io_off.map = i;
			io_on.map = i;

			io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
			io_on.start = s->io[i].res->start;
			io_on.stop = s->io[i].res->end;

			s->ops->set_io_map(s, &io_off);
			mdelay(40);
			s->ops->set_io_map(s, &io_on);
		}
	}
	ret = 0;
unlock:
	mutex_unlock(&s->ops_mutex);

	return ret;
} /* modify_configuration */
EXPORT_SYMBOL(pcmcia_modify_configuration);


int pcmcia_release_configuration(struct pcmcia_device *p_dev)
{
	pccard_io_map io = { 0, 0, 0, 0, 1 };
	struct pcmcia_socket *s = p_dev->socket;
	config_t *c;
	int i;

	mutex_lock(&s->ops_mutex);
	c = p_dev->function_config;
	if (p_dev->_locked) {
		p_dev->_locked = 0;
		if (--(s->lock_count) == 0) {
			s->socket.flags = SS_OUTPUT_ENA;   /* Is this correct? */
			s->socket.Vpp = 0;
			s->socket.io_irq = 0;
			s->ops->set_socket(s, &s->socket);
		}
	}
	if (c->state & CONFIG_LOCKED) {
		c->state &= ~CONFIG_LOCKED;
		if (c->state & CONFIG_IO_REQ)
			for (i = 0; i < MAX_IO_WIN; i++) {
				if (!s->io[i].res)
					continue;
				s->io[i].Config--;
				if (s->io[i].Config != 0)
					continue;
				io.map = i;
				s->ops->set_io_map(s, &io);
			}
	}
	mutex_unlock(&s->ops_mutex);

	return 0;
} /* pcmcia_release_configuration */


/** pcmcia_release_io
 *
 * Release_io() releases the I/O ranges allocated by a client.  This
 * may be invoked some time after a card ejection has already dumped
 * the actual socket configuration, so if the client is "stale", we
 * don't bother checking the port ranges against the current socket
 * values.
 */
static int pcmcia_release_io(struct pcmcia_device *p_dev, io_req_t *req)
{
	struct pcmcia_socket *s = p_dev->socket;
	int ret = -EINVAL;
	config_t *c;

	mutex_lock(&s->ops_mutex);
	c = p_dev->function_config;

	if (!p_dev->_io)
		goto out;

	p_dev->_io = 0;

	if ((c->io.BasePort1 != req->BasePort1) ||
	    (c->io.NumPorts1 != req->NumPorts1) ||
	    (c->io.BasePort2 != req->BasePort2) ||
	    (c->io.NumPorts2 != req->NumPorts2))
		goto out;

	c->state &= ~CONFIG_IO_REQ;

	release_io_space(s, req->BasePort1, req->NumPorts1);
	if (req->NumPorts2)
		release_io_space(s, req->BasePort2, req->NumPorts2);

out:
	mutex_unlock(&s->ops_mutex);

	return ret;
} /* pcmcia_release_io */


int pcmcia_release_window(struct pcmcia_device *p_dev, window_handle_t wh)
{
	struct pcmcia_socket *s = p_dev->socket;
	pccard_mem_map *win;

	wh--;
	if (wh >= MAX_WIN)
		return -EINVAL;

	mutex_lock(&s->ops_mutex);
	win = &s->win[wh];

	if (!(p_dev->_win & CLIENT_WIN_REQ(wh))) {
		dev_dbg(&s->dev, "not releasing unknown window\n");
		mutex_unlock(&s->ops_mutex);
		return -EINVAL;
	}

	/* Shut down memory window */
	win->flags &= ~MAP_ACTIVE;
	s->ops->set_mem_map(s, win);
	s->state &= ~SOCKET_WIN_REQ(wh);

	/* Release system memory */
	if (win->res) {
		release_resource(win->res);
		kfree(win->res);
		win->res = NULL;
	}
	p_dev->_win &= ~CLIENT_WIN_REQ(wh);
	mutex_unlock(&s->ops_mutex);

	return 0;
} /* pcmcia_release_window */
EXPORT_SYMBOL(pcmcia_release_window);


int pcmcia_request_configuration(struct pcmcia_device *p_dev,
				 config_req_t *req)
{
	int i;
	u_int base;
	struct pcmcia_socket *s = p_dev->socket;
	config_t *c;
	pccard_io_map iomap;

	if (!(s->state & SOCKET_PRESENT))
		return -ENODEV;

	if (req->IntType & INT_CARDBUS) {
		dev_dbg(&s->dev, "IntType may not be INT_CARDBUS\n");
		return -EINVAL;
	}

	mutex_lock(&s->ops_mutex);
	c = p_dev->function_config;
	if (c->state & CONFIG_LOCKED) {
		mutex_unlock(&s->ops_mutex);
		dev_dbg(&s->dev, "Configuration is locked\n");
		return -EACCES;
	}

	/* Do power control.  We don't allow changes in Vcc. */
	s->socket.Vpp = req->Vpp;
	if (s->ops->set_socket(s, &s->socket)) {
		mutex_unlock(&s->ops_mutex);
		dev_printk(KERN_WARNING, &s->dev,
			   "Unable to set socket state\n");
		return -EINVAL;
	}

	/* Pick memory or I/O card, DMA mode, interrupt */
	c->IntType = req->IntType;
	c->Attributes = req->Attributes;
	if (req->IntType & INT_MEMORY_AND_IO)
		s->socket.flags |= SS_IOCARD;
	if (req->IntType & INT_ZOOMED_VIDEO)
		s->socket.flags |= SS_ZVCARD | SS_IOCARD;
	if (req->Attributes & CONF_ENABLE_DMA)
		s->socket.flags |= SS_DMA_MODE;
	if (req->Attributes & CONF_ENABLE_SPKR)
		s->socket.flags |= SS_SPKR_ENA;
	if (req->Attributes & CONF_ENABLE_IRQ)
		s->socket.io_irq = s->pcmcia_irq;
	else
		s->socket.io_irq = 0;
	s->ops->set_socket(s, &s->socket);
	s->lock_count++;

	/* Set up CIS configuration registers */
	base = c->ConfigBase = req->ConfigBase;
	c->CardValues = req->Present;
	if (req->Present & PRESENT_COPY) {
		c->Copy = req->Copy;
		pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &c->Copy);
	}
	if (req->Present & PRESENT_OPTION) {
		if (s->functions == 1) {
			c->Option = req->ConfigIndex & COR_CONFIG_MASK;
		} else {
			c->Option = req->ConfigIndex & COR_MFC_CONFIG_MASK;
			c->Option |= COR_FUNC_ENA|COR_IREQ_ENA;
			if (req->Present & PRESENT_IOBASE_0)
				c->Option |= COR_ADDR_DECODE;
		}
		if ((req->Attributes & CONF_ENABLE_IRQ) &&
			!(req->Attributes & CONF_ENABLE_PULSE_IRQ))
			c->Option |= COR_LEVEL_REQ;
		pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &c->Option);
		mdelay(40);
	}
	if (req->Present & PRESENT_STATUS) {
		c->Status = req->Status;
		pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &c->Status);
	}
	if (req->Present & PRESENT_PIN_REPLACE) {
		c->Pin = req->Pin;
		pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &c->Pin);
	}
	if (req->Present & PRESENT_EXT_STATUS) {
		c->ExtStatus = req->ExtStatus;
		pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, &c->ExtStatus);
	}
	if (req->Present & PRESENT_IOBASE_0) {
		u_char b = c->io.BasePort1 & 0xff;
		pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
		b = (c->io.BasePort1 >> 8) & 0xff;
		pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
	}
	if (req->Present & PRESENT_IOSIZE) {
		u_char b = c->io.NumPorts1 + c->io.NumPorts2 - 1;
		pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
	}

	/* Configure I/O windows */
	if (c->state & CONFIG_IO_REQ) {
		iomap.speed = io_speed;
		for (i = 0; i < MAX_IO_WIN; i++)
			if (s->io[i].res) {
				iomap.map = i;
				iomap.flags = MAP_ACTIVE;
				switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
				case IO_DATA_PATH_WIDTH_16:
					iomap.flags |= MAP_16BIT; break;
				case IO_DATA_PATH_WIDTH_AUTO:
					iomap.flags |= MAP_AUTOSZ; break;
				default:
					break;
				}
				iomap.start = s->io[i].res->start;
				iomap.stop = s->io[i].res->end;
				s->ops->set_io_map(s, &iomap);
				s->io[i].Config++;
			}
	}

	c->state |= CONFIG_LOCKED;
	p_dev->_locked = 1;
	mutex_unlock(&s->ops_mutex);
	return 0;
} /* pcmcia_request_configuration */
EXPORT_SYMBOL(pcmcia_request_configuration);


/** pcmcia_request_io
 *
 * Request_io() reserves ranges of port addresses for a socket.
 * I have not implemented range sharing or alias addressing.
 */
int pcmcia_request_io(struct pcmcia_device *p_dev, io_req_t *req)
{
	struct pcmcia_socket *s = p_dev->socket;
	config_t *c;
	int ret = -EINVAL;

	mutex_lock(&s->ops_mutex);

	if (!(s->state & SOCKET_PRESENT)) {
		dev_dbg(&s->dev, "No card present\n");
		goto out;
	}

	if (!req)
		goto out;

	c = p_dev->function_config;
	if (c->state & CONFIG_LOCKED) {
		dev_dbg(&s->dev, "Configuration is locked\n");
		goto out;
	}
	if (c->state & CONFIG_IO_REQ) {
		dev_dbg(&s->dev, "IO already configured\n");
		goto out;
	}
	if (req->Attributes1 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS)) {
		dev_dbg(&s->dev, "bad attribute setting for IO region 1\n");
		goto out;
	}
	if ((req->NumPorts2 > 0) &&
	    (req->Attributes2 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS))) {
		dev_dbg(&s->dev, "bad attribute setting for IO region 2\n");
		goto out;
	}

	dev_dbg(&s->dev, "trying to allocate resource 1\n");
	ret = alloc_io_space(s, req->Attributes1, &req->BasePort1,
			     req->NumPorts1, req->IOAddrLines);
	if (ret) {
		dev_dbg(&s->dev, "allocation of resource 1 failed\n");
		goto out;
	}

	if (req->NumPorts2) {
		dev_dbg(&s->dev, "trying to allocate resource 2\n");
		ret = alloc_io_space(s, req->Attributes2, &req->BasePort2,
				     req->NumPorts2, req->IOAddrLines);
		if (ret) {
			dev_dbg(&s->dev, "allocation of resource 2 failed\n");
			release_io_space(s, req->BasePort1, req->NumPorts1);
			goto out;
		}
	}

	c->io = *req;
	c->state |= CONFIG_IO_REQ;
	p_dev->_io = 1;
	dev_dbg(&s->dev, "allocating resources succeeded: %d\n", ret);

out:
	mutex_unlock(&s->ops_mutex);

	return ret;
} /* pcmcia_request_io */
EXPORT_SYMBOL(pcmcia_request_io);


/**
 * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
 *
 * pcmcia_request_irq() is a wrapper around request_irq which will allow
 * the PCMCIA core to clean up the registration in pcmcia_disable_device().
 * Drivers are free to use request_irq() directly, but then they need to
 * call free_irq themselfves, too. Also, only IRQF_SHARED capable IRQ
 * handlers are allowed.
 */
int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
				    irq_handler_t handler)
{
	int ret;

	if (!p_dev->irq)
		return -EINVAL;

	ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
			p_dev->devname, p_dev->priv);
	if (!ret)
		p_dev->_irq = 1;

	return ret;
}
EXPORT_SYMBOL(pcmcia_request_irq);


/**
 * pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first
 *
 * pcmcia_request_exclusive_irq() is a wrapper around request_irq which
 * attempts first to request an exclusive IRQ. If it fails, it also accepts
 * a shared IRQ, but prints out a warning. PCMCIA drivers should allow for
 * IRQ sharing and either use request_irq directly (then they need to call
 * free_irq themselves, too), or the pcmcia_request_irq() function.
 */
int __must_check
__pcmcia_request_exclusive_irq(struct pcmcia_device *p_dev,
			irq_handler_t handler)
{
	int ret;

	if (!p_dev->irq)
		return -EINVAL;

	ret = request_irq(p_dev->irq, handler, 0, p_dev->devname, p_dev->priv);
	if (ret) {
		ret = pcmcia_request_irq(p_dev, handler);
		dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
			"request for exclusive IRQ could not be fulfilled.\n");
		dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
			"needs updating to supported shared IRQ lines.\n");
	}
	if (ret)
		dev_printk(KERN_INFO, &p_dev->dev, "request_irq() failed\n");
	else
		p_dev->_irq = 1;

	return ret;
} /* pcmcia_request_exclusive_irq */
EXPORT_SYMBOL(__pcmcia_request_exclusive_irq);


#ifdef CONFIG_PCMCIA_PROBE

/* mask of IRQs already reserved by other cards, we should avoid using them */
static u8 pcmcia_used_irq[NR_IRQS];

static irqreturn_t test_action(int cpl, void *dev_id)
{
	return IRQ_NONE;
}

/**
 * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
 * @p_dev - the associated PCMCIA device
 *
 * locking note: must be called with ops_mutex locked.
 */
static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
{
	struct pcmcia_socket *s = p_dev->socket;
	unsigned int try, irq;
	u32 mask = s->irq_mask;
	int ret = -ENODEV;

	for (try = 0; try < 64; try++) {
		irq = try % 32;

		/* marked as available by driver, not blocked by userspace? */
		if (!((mask >> irq) & 1))
			continue;

		/* avoid an IRQ which is already used by another PCMCIA card */
		if ((try < 32) && pcmcia_used_irq[irq])
			continue;

		/* register the correct driver, if possible, to check whether
		 * registering a dummy handle works, i.e. if the IRQ isn't
		 * marked as used by the kernel resource management core */
		ret = request_irq(irq, test_action, type, p_dev->devname,
				  p_dev);
		if (!ret) {
			free_irq(irq, p_dev);
			p_dev->irq = s->pcmcia_irq = irq;
			pcmcia_used_irq[irq]++;
			break;
		}
	}

	return ret;
}

void pcmcia_cleanup_irq(struct pcmcia_socket *s)
{
	pcmcia_used_irq[s->pcmcia_irq]--;
	s->pcmcia_irq = 0;
}

#else /* CONFIG_PCMCIA_PROBE */

static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
{
	return -EINVAL;
}

void pcmcia_cleanup_irq(struct pcmcia_socket *s)
{
	s->pcmcia_irq = 0;
	return;
}

#endif  /* CONFIG_PCMCIA_PROBE */


/**
 * pcmcia_setup_irq() - determine IRQ to be used for device
 * @p_dev - the associated PCMCIA device
 *
 * locking note: must be called with ops_mutex locked.
 */
int pcmcia_setup_irq(struct pcmcia_device *p_dev)
{
	struct pcmcia_socket *s = p_dev->socket;

	if (p_dev->irq)
		return 0;

	/* already assigned? */
	if (s->pcmcia_irq) {
		p_dev->irq = s->pcmcia_irq;
		return 0;
	}

	/* prefer an exclusive ISA irq */
	if (!pcmcia_setup_isa_irq(p_dev, 0))
		return 0;

	/* but accept a shared ISA irq */
	if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
		return 0;

	/* but use the PCI irq otherwise */
	if (s->pci_irq) {
		p_dev->irq = s->pcmcia_irq = s->pci_irq;
		return 0;
	}

	return -EINVAL;
}


/** pcmcia_request_window
 *
 * Request_window() establishes a mapping between card memory space
 * and system memory space.
 */
int pcmcia_request_window(struct pcmcia_device *p_dev, win_req_t *req, window_handle_t *wh)
{
	struct pcmcia_socket *s = p_dev->socket;
	pccard_mem_map *win;
	u_long align;
	int w;

	if (!(s->state & SOCKET_PRESENT)) {
		dev_dbg(&s->dev, "No card present\n");
		return -ENODEV;
	}
	if (req->Attributes & (WIN_PAGED | WIN_SHARED)) {
		dev_dbg(&s->dev, "bad attribute setting for iomem region\n");
		return -EINVAL;
	}

	/* Window size defaults to smallest available */
	if (req->Size == 0)
		req->Size = s->map_size;
	align = (((s->features & SS_CAP_MEM_ALIGN) ||
		  (req->Attributes & WIN_STRICT_ALIGN)) ?
		 req->Size : s->map_size);
	if (req->Size & (s->map_size-1)) {
		dev_dbg(&s->dev, "invalid map size\n");
		return -EINVAL;
	}
	if ((req->Base && (s->features & SS_CAP_STATIC_MAP)) ||
	    (req->Base & (align-1))) {
		dev_dbg(&s->dev, "invalid base address\n");
		return -EINVAL;
	}
	if (req->Base)
		align = 0;

	/* Allocate system memory window */
	for (w = 0; w < MAX_WIN; w++)
		if (!(s->state & SOCKET_WIN_REQ(w)))
			break;
	if (w == MAX_WIN) {
		dev_dbg(&s->dev, "all windows are used already\n");
		return -EINVAL;
	}

	mutex_lock(&s->ops_mutex);
	win = &s->win[w];

	if (!(s->features & SS_CAP_STATIC_MAP)) {
		win->res = pcmcia_find_mem_region(req->Base, req->Size, align,
						      (req->Attributes & WIN_MAP_BELOW_1MB), s);
		if (!win->res) {
			dev_dbg(&s->dev, "allocating mem region failed\n");
			mutex_unlock(&s->ops_mutex);
			return -EINVAL;
		}
	}
	p_dev->_win |= CLIENT_WIN_REQ(w);

	/* Configure the socket controller */
	win->map = w+1;
	win->flags = 0;
	win->speed = req->AccessSpeed;
	if (req->Attributes & WIN_MEMORY_TYPE)
		win->flags |= MAP_ATTRIB;
	if (req->Attributes & WIN_ENABLE)
		win->flags |= MAP_ACTIVE;
	if (req->Attributes & WIN_DATA_WIDTH_16)
		win->flags |= MAP_16BIT;
	if (req->Attributes & WIN_USE_WAIT)
		win->flags |= MAP_USE_WAIT;
	win->card_start = 0;

	if (s->ops->set_mem_map(s, win) != 0) {
		dev_dbg(&s->dev, "failed to set memory mapping\n");
		mutex_unlock(&s->ops_mutex);
		return -EIO;
	}
	s->state |= SOCKET_WIN_REQ(w);

	/* Return window handle */
	if (s->features & SS_CAP_STATIC_MAP)
		req->Base = win->static_start;
	else
		req->Base = win->res->start;

	mutex_unlock(&s->ops_mutex);
	*wh = w + 1;

	return 0;
} /* pcmcia_request_window */
EXPORT_SYMBOL(pcmcia_request_window);

void pcmcia_disable_device(struct pcmcia_device *p_dev)
{
	pcmcia_release_configuration(p_dev);
	pcmcia_release_io(p_dev, &p_dev->io);
	if (p_dev->_irq) {
		free_irq(p_dev->irq, p_dev->priv);
		p_dev->_irq = 0;
	}
	if (p_dev->win)
		pcmcia_release_window(p_dev, p_dev->win);
}
EXPORT_SYMBOL(pcmcia_disable_device);