aboutsummaryrefslogtreecommitdiff
path: root/arch/arm26/kernel/ecard.c
blob: 43dd41be71fb80ac1ac7f0898924c77902b9bd5f (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
/*
 *  linux/arch/arm26/kernel/ecard.c
 *
 *  Copyright 1995-2001 Russell King
 *  Copyright 2003 Ian Molton
 *
 * 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.
 *
 *  Find all installed expansion cards, and handle interrupts from them.
 *
 *  Created from information from Acorns RiscOS3 PRMs
 *  15-Jun-2003 IM      Modified from ARM32 (RiscPC capable) version
 *  10-Jan-1999	RMK	Run loaders in a simulated RISC OS environment.
 *  06-May-1997	RMK	Added blacklist for cards whose loader doesn't work.
 *  12-Sep-1997	RMK	Created new handling of interrupt enables/disables
 *			- cards can now register their own routine to control
 *			interrupts (recommended).
 *  29-Sep-1997	RMK	Expansion card interrupt hardware not being re-enabled
 *			on reset from Linux. (Caused cards not to respond
 *			under RiscOS without hard reset).
 *
 */
#define ECARD_C

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/device.h>
#include <linux/init.h>

#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/irqchip.h>
#include <asm/tlbflush.h>

enum req {
	req_readbytes,
	req_reset
};

struct ecard_request {
	enum req	req;
	ecard_t		*ec;
	unsigned int	address;
	unsigned int	length;
	unsigned int	use_loader;
	void		*buffer;
};

struct expcard_blacklist {
	unsigned short	 manufacturer;
	unsigned short	 product;
	const char	*type;
};

static ecard_t *cards;
static ecard_t *slot_to_expcard[MAX_ECARDS];
static unsigned int ectcr;

/* List of descriptions of cards which don't have an extended
 * identification, or chunk directories containing a description.
 */
static struct expcard_blacklist __initdata blacklist[] = {
	{ MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
};

asmlinkage extern int
ecard_loader_reset(volatile unsigned char *pa, loader_t loader);
asmlinkage extern int
ecard_loader_read(int off, volatile unsigned char *pa, loader_t loader);

static const struct ecard_id *
ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec);

static inline unsigned short
ecard_getu16(unsigned char *v)
{
	return v[0] | v[1] << 8;
}

static inline signed long
ecard_gets24(unsigned char *v)
{
	return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
}

static inline ecard_t *
slot_to_ecard(unsigned int slot)
{
	return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
}

/* ===================== Expansion card daemon ======================== */
/*
 * Since the loader programs on the expansion cards need to be run
 * in a specific environment, create a separate task with this
 * environment up, and pass requests to this task as and when we
 * need to.
 *
 * This should allow 99% of loaders to be called from Linux.
 *
 * From a security standpoint, we trust the card vendors.  This
 * may be a misplaced trust.
 */
#define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
#define POD_INT_ADDR(x)	((volatile unsigned char *)\
			 ((BUS_ADDR((x)) - IO_BASE) + IO_START))

static inline void ecard_task_reset(struct ecard_request *req)
{
	struct expansion_card *ec = req->ec;
	if (ec->loader)
		ecard_loader_reset(POD_INT_ADDR(ec->podaddr), ec->loader);
}

static void
ecard_task_readbytes(struct ecard_request *req)
{
	unsigned char *buf = (unsigned char *)req->buffer;
	volatile unsigned char *base_addr =
		(volatile unsigned char *)POD_INT_ADDR(req->ec->podaddr);
	unsigned int len = req->length;
	unsigned int off = req->address;

	if (!req->use_loader || !req->ec->loader) {
		off *= 4;
		while (len--) {
			*buf++ = base_addr[off];
			off += 4;
		}
	} else {
		while(len--) {
			/*
			 * The following is required by some
			 * expansion card loader programs.
			 */
			*(unsigned long *)0x108 = 0;
			*buf++ = ecard_loader_read(off++, base_addr,
						   req->ec->loader);
		}
	}
}

static void ecard_do_request(struct ecard_request *req)
{
	switch (req->req) {
	case req_readbytes:
		ecard_task_readbytes(req);
		break;

	case req_reset:
		ecard_task_reset(req);
		break;
	}
}

/*
 * On 26-bit processors, we don't need the kcardd thread to access the
 * expansion card loaders.  We do it directly.
 */
#define ecard_call(req)	ecard_do_request(req)

/* ======================= Mid-level card control ===================== */

static void
ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
{
	struct ecard_request req;

	req.req		= req_readbytes;
	req.ec		= ec;
	req.address	= off;
	req.length	= len;
	req.use_loader	= useld;
	req.buffer	= addr;

	ecard_call(&req);
}

int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
{
	struct ex_chunk_dir excd;
	int index = 16;
	int useld = 0;

	if (!ec->cid.cd)
		return 0;

	while(1) {
		ecard_readbytes(&excd, ec, index, 8, useld);
		index += 8;
		if (c_id(&excd) == 0) {
			if (!useld && ec->loader) {
				useld = 1;
				index = 0;
				continue;
			}
			return 0;
		}
		if (c_id(&excd) == 0xf0) { /* link */
			index = c_start(&excd);
			continue;
		}
		if (c_id(&excd) == 0x80) { /* loader */
			if (!ec->loader) {
				ec->loader = (loader_t)kmalloc(c_len(&excd),
							       GFP_KERNEL);
				if (ec->loader)
					ecard_readbytes(ec->loader, ec,
							(int)c_start(&excd),
							c_len(&excd), useld);
				else
					return 0;
			}
			continue;
		}
		if (c_id(&excd) == id && num-- == 0)
			break;
	}

	if (c_id(&excd) & 0x80) {
		switch (c_id(&excd) & 0x70) {
		case 0x70:
			ecard_readbytes((unsigned char *)excd.d.string, ec,
					(int)c_start(&excd), c_len(&excd),
					useld);
			break;
		case 0x00:
			break;
		}
	}
	cd->start_offset = c_start(&excd);
	memcpy(cd->d.string, excd.d.string, 256);
	return 1;
}

/* ======================= Interrupt control ============================ */

static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
{
}

static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
{
}

static int ecard_def_irq_pending(ecard_t *ec)
{
	return !ec->irqmask || ec->irqaddr[0] & ec->irqmask;
}

static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
{
	panic("ecard_def_fiq_enable called - impossible");
}

static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
{
	panic("ecard_def_fiq_disable called - impossible");
}

static int ecard_def_fiq_pending(ecard_t *ec)
{
	return !ec->fiqmask || ec->fiqaddr[0] & ec->fiqmask;
}

static expansioncard_ops_t ecard_default_ops = {
	ecard_def_irq_enable,
	ecard_def_irq_disable,
	ecard_def_irq_pending,
	ecard_def_fiq_enable,
	ecard_def_fiq_disable,
	ecard_def_fiq_pending
};

/*
 * Enable and disable interrupts from expansion cards.
 * (interrupts are disabled for these functions).
 *
 * They are not meant to be called directly, but via enable/disable_irq.
 */
static void ecard_irq_unmask(unsigned int irqnr)
{
	ecard_t *ec = slot_to_ecard(irqnr - 32);

	if (ec) {
		if (!ec->ops)
			ec->ops = &ecard_default_ops;

		if (ec->claimed && ec->ops->irqenable)
			ec->ops->irqenable(ec, irqnr);
		else
			printk(KERN_ERR "ecard: rejecting request to "
				"enable IRQs for %d\n", irqnr);
	}
}

static void ecard_irq_mask(unsigned int irqnr)
{
	ecard_t *ec = slot_to_ecard(irqnr - 32);

	if (ec) {
		if (!ec->ops)
			ec->ops = &ecard_default_ops;

		if (ec->ops && ec->ops->irqdisable)
			ec->ops->irqdisable(ec, irqnr);
	}
}

static struct irqchip ecard_chip = {
	.ack	= ecard_irq_mask,
	.mask	= ecard_irq_mask,
	.unmask = ecard_irq_unmask,
};

void ecard_enablefiq(unsigned int fiqnr)
{
	ecard_t *ec = slot_to_ecard(fiqnr);

	if (ec) {
		if (!ec->ops)
			ec->ops = &ecard_default_ops;

		if (ec->claimed && ec->ops->fiqenable)
			ec->ops->fiqenable(ec, fiqnr);
		else
			printk(KERN_ERR "ecard: rejecting request to "
				"enable FIQs for %d\n", fiqnr);
	}
}

void ecard_disablefiq(unsigned int fiqnr)
{
	ecard_t *ec = slot_to_ecard(fiqnr);

	if (ec) {
		if (!ec->ops)
			ec->ops = &ecard_default_ops;

		if (ec->ops->fiqdisable)
			ec->ops->fiqdisable(ec, fiqnr);
	}
}

static void
ecard_dump_irq_state(ecard_t *ec)
{
	printk("  %d: %sclaimed, ",
	       ec->slot_no,
	       ec->claimed ? "" : "not ");

	if (ec->ops && ec->ops->irqpending &&
	    ec->ops != &ecard_default_ops)
		printk("irq %spending\n",
		       ec->ops->irqpending(ec) ? "" : "not ");
	else
		printk("irqaddr %p, mask = %02X, status = %02X\n",
		       ec->irqaddr, ec->irqmask, *ec->irqaddr);
}

static void ecard_check_lockup(struct irqdesc *desc)
{
	static int last, lockup;
	ecard_t *ec;

	/*
	 * If the timer interrupt has not run since the last million
	 * unrecognised expansion card interrupts, then there is
	 * something seriously wrong.  Disable the expansion card
	 * interrupts so at least we can continue.
	 *
	 * Maybe we ought to start a timer to re-enable them some time
	 * later?
	 */
	if (last == jiffies) {
		lockup += 1;
		if (lockup > 1000000) {
			printk(KERN_ERR "\nInterrupt lockup detected - "
			       "disabling all expansion card interrupts\n");

			desc->chip->mask(IRQ_EXPANSIONCARD);

			printk("Expansion card IRQ state:\n");

			for (ec = cards; ec; ec = ec->next)
				ecard_dump_irq_state(ec);
		}
	} else
		lockup = 0;

	/*
	 * If we did not recognise the source of this interrupt,
	 * warn the user, but don't flood the user with these messages.
	 */
	if (!last || time_after(jiffies, (unsigned long)(last + 5*HZ))) {
		last = jiffies;
		printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
	}
}

static void
ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
{
	ecard_t *ec;
	int called = 0;

	desc->chip->mask(irq);
	for (ec = cards; ec; ec = ec->next) {
		int pending;

		if (!ec->claimed || ec->irq == NO_IRQ)
			continue;

		if (ec->ops && ec->ops->irqpending)
			pending = ec->ops->irqpending(ec);
		else
			pending = ecard_default_ops.irqpending(ec);

		if (pending) {
			struct irqdesc *d = irq_desc + ec->irq;
			d->handle(ec->irq, d, regs);
			called ++;
		}
	}
	desc->chip->unmask(irq);

	if (called == 0)
		ecard_check_lockup(desc);
}

#define ecard_irqexp_handler NULL
#define ecard_probeirqhw() (0)

unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
{
	unsigned long address = 0;
	int slot = ec->slot_no;

	ectcr &= ~(1 << slot);

	switch (type) {
	case ECARD_MEMC:
		address = IO_EC_MEMC_BASE + (slot << 12);
		break;

	case ECARD_IOC:
		address = IO_EC_IOC_BASE + (slot << 12) + (speed << 17);
		break;

	default:
		break;
	}

	return address;
}

static int ecard_prints(char *buffer, ecard_t *ec)
{
	char *start = buffer;

	buffer += sprintf(buffer, "  %d: ", ec->slot_no);

	if (ec->cid.id == 0) {
		struct in_chunk_dir incd;

		buffer += sprintf(buffer, "[%04X:%04X] ",
			ec->cid.manufacturer, ec->cid.product);

		if (!ec->card_desc && ec->cid.cd &&
		    ecard_readchunk(&incd, ec, 0xf5, 0)) {
			ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);

			if (ec->card_desc)
				strcpy((char *)ec->card_desc, incd.d.string);
		}

		buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
	} else
		buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);

	return buffer - start;
}

static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
{
	ecard_t *ec = cards;
	off_t at = 0;
	int len, cnt;

	cnt = 0;
	while (ec && count > cnt) {
		len = ecard_prints(buf, ec);
		at += len;
		if (at >= pos) {
			if (!*start) {
				*start = buf + (pos - (at - len));
				cnt = at - pos;
			} else
				cnt += len;
			buf += len;
		}
		ec = ec->next;
	}
	return (count > cnt) ? cnt : count;
}

static struct proc_dir_entry *proc_bus_ecard_dir = NULL;

static void ecard_proc_init(void)
{
	proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
	create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
		get_ecard_dev_info);
}

#define ec_set_resource(ec,nr,st,sz,flg)			\
	do {							\
		(ec)->resource[nr].name = ec->dev.bus_id;	\
		(ec)->resource[nr].start = st;			\
		(ec)->resource[nr].end = (st) + (sz) - 1;	\
		(ec)->resource[nr].flags = flg;			\
	} while (0)

static void __init ecard_init_resources(struct expansion_card *ec)
{
	unsigned long base = PODSLOT_IOC0_BASE;
	unsigned int slot = ec->slot_no;
	int i;

	ec_set_resource(ec, ECARD_RES_MEMC,
			PODSLOT_MEMC_BASE + (slot << 14),
			PODSLOT_MEMC_SIZE, IORESOURCE_MEM);

	for (i = 0; i < ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) {
		ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
				base + (slot << 14) + (i << 19),
				PODSLOT_IOC_SIZE, IORESOURCE_MEM);
	}

	for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
		if (ec->resource[i].start &&
		    request_resource(&iomem_resource, &ec->resource[i])) {
			printk(KERN_ERR "%s: resource(s) not available\n",
				ec->dev.bus_id);
			ec->resource[i].end -= ec->resource[i].start;
			ec->resource[i].start = 0;
		}
	}
}

static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	return sprintf(buf, "%u\n", ec->irq);
}

static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	return sprintf(buf, "%u\n", ec->cid.manufacturer);
}

static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	return sprintf(buf, "%u\n", ec->cid.product);
}

static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	return sprintf(buf, "%u\n", ec->dma);
}

static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	char *str = buf;
	int i;

	for (i = 0; i < ECARD_NUM_RESOURCES; i++)
		str += sprintf(str, "%08lx %08lx %08lx\n",
				ec->resource[i].start,
				ec->resource[i].end,
				ec->resource[i].flags);

	return str - buf;
}

static DEVICE_ATTR(irq, S_IRUGO, ecard_show_irq, NULL);
static DEVICE_ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL);
static DEVICE_ATTR(device, S_IRUGO, ecard_show_device, NULL);
static DEVICE_ATTR(dma, S_IRUGO, ecard_show_dma, NULL);
static DEVICE_ATTR(resource, S_IRUGO, ecard_show_resources, NULL);

/*
 * Probe for an expansion card.
 *
 * If bit 1 of the first byte of the card is set, then the
 * card does not exist.
 */
static int __init
ecard_probe(int slot, card_type_t type)
{
	ecard_t **ecp;
	ecard_t *ec;
	struct ex_ecid cid;
	int i, rc = -ENOMEM;

	ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
	if (!ec)
		goto nomem;

	ec->slot_no	= slot;
	ec->type        = type;
	ec->irq		= NO_IRQ;
	ec->fiq		= NO_IRQ;
	ec->dma		= NO_DMA;
	ec->card_desc	= NULL;
	ec->ops		= &ecard_default_ops;

	rc = -ENODEV;
	if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
		goto nodev;

	cid.r_zero = 1;
	ecard_readbytes(&cid, ec, 0, 16, 0);
	if (cid.r_zero)
		goto nodev;

	ec->cid.id	= cid.r_id;
	ec->cid.cd	= cid.r_cd;
	ec->cid.is	= cid.r_is;
	ec->cid.w	= cid.r_w;
	ec->cid.manufacturer = ecard_getu16(cid.r_manu);
	ec->cid.product = ecard_getu16(cid.r_prod);
	ec->cid.country = cid.r_country;
	ec->cid.irqmask = cid.r_irqmask;
	ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
	ec->cid.fiqmask = cid.r_fiqmask;
	ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
	ec->fiqaddr	=
	ec->irqaddr	= (unsigned char *)ioaddr(ec->podaddr);

	if (ec->cid.is) {
		ec->irqmask = ec->cid.irqmask;
		ec->irqaddr += ec->cid.irqoff;
		ec->fiqmask = ec->cid.fiqmask;
		ec->fiqaddr += ec->cid.fiqoff;
	} else {
		ec->irqmask = 1;
		ec->fiqmask = 4;
	}

	for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
		if (blacklist[i].manufacturer == ec->cid.manufacturer &&
		    blacklist[i].product == ec->cid.product) {
			ec->card_desc = blacklist[i].type;
			break;
		}

	snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
	ec->dev.parent = NULL;
	ec->dev.bus    = &ecard_bus_type;
	ec->dev.dma_mask = &ec->dma_mask;
	ec->dma_mask = (u64)0xffffffff;

	ecard_init_resources(ec);

	/*
	 * hook the interrupt handlers
	 */
	ec->irq = 32 + slot;
	set_irq_chip(ec->irq, &ecard_chip);
	set_irq_handler(ec->irq, do_level_IRQ);
	set_irq_flags(ec->irq, IRQF_VALID);

	for (ecp = &cards; *ecp; ecp = &(*ecp)->next);

	*ecp = ec;
	slot_to_expcard[slot] = ec;

	device_register(&ec->dev);
	device_create_file(&ec->dev, &dev_attr_dma);
	device_create_file(&ec->dev, &dev_attr_irq);
	device_create_file(&ec->dev, &dev_attr_resource);
	device_create_file(&ec->dev, &dev_attr_vendor);
	device_create_file(&ec->dev, &dev_attr_device); 

	return 0;

nodev:
	kfree(ec);
nomem:
	return rc;
}

/*
 * Initialise the expansion card system.
 * Locate all hardware - interrupt management and
 * actual cards.
 */
static int __init ecard_init(void)
{
	int slot, irqhw;

	printk("Probing expansion cards\n");

	for (slot = 0; slot < MAX_ECARDS; slot ++) {
		ecard_probe(slot, ECARD_IOC);
	}

	irqhw = ecard_probeirqhw();

	set_irq_chained_handler(IRQ_EXPANSIONCARD,
				irqhw ? ecard_irqexp_handler : ecard_irq_handler);

	ecard_proc_init();

	return 0;
}

subsys_initcall(ecard_init);

/*
 *	ECARD "bus"
 */
static const struct ecard_id *
ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
{
	int i;

	for (i = 0; ids[i].manufacturer != 65535; i++)
		if (ec->cid.manufacturer == ids[i].manufacturer &&
		    ec->cid.product == ids[i].product)
			return ids + i;

	return NULL;
}

static int ecard_drv_probe(struct device *dev)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	struct ecard_driver *drv = ECARD_DRV(dev->driver);
	const struct ecard_id *id;
	int ret;

	id = ecard_match_device(drv->id_table, ec);

	ecard_claim(ec);
	ret = drv->probe(ec, id);
	if (ret)
		ecard_release(ec);
	return ret;
}

static int ecard_drv_remove(struct device *dev)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	struct ecard_driver *drv = ECARD_DRV(dev->driver);

	drv->remove(ec);
	ecard_release(ec);

	return 0;
}

/*
 * Before rebooting, we must make sure that the expansion card is in a
 * sensible state, so it can be re-detected.  This means that the first
 * page of the ROM must be visible.  We call the expansion cards reset
 * handler, if any.
 */
static void ecard_drv_shutdown(struct device *dev)
{
	struct expansion_card *ec = ECARD_DEV(dev);
	struct ecard_driver *drv = ECARD_DRV(dev->driver);
	struct ecard_request req;

	if (drv->shutdown)
		drv->shutdown(ec);
	ecard_release(ec);
	req.req = req_reset;
	req.ec = ec;
	ecard_call(&req);
}

int ecard_register_driver(struct ecard_driver *drv)
{
	drv->drv.bus = &ecard_bus_type;
	drv->drv.probe = ecard_drv_probe;
	drv->drv.remove = ecard_drv_remove;
	drv->drv.shutdown = ecard_drv_shutdown;

	return driver_register(&drv->drv);
}

void ecard_remove_driver(struct ecard_driver *drv)
{
	driver_unregister(&drv->drv);
}

static int ecard_match(struct device *_dev, struct device_driver *_drv)
{
	struct expansion_card *ec = ECARD_DEV(_dev);
	struct ecard_driver *drv = ECARD_DRV(_drv);
	int ret;

	if (drv->id_table) {
		ret = ecard_match_device(drv->id_table, ec) != NULL;
	} else {
		ret = ec->cid.id == drv->id;
	}

	return ret;
}

struct bus_type ecard_bus_type = {
	.name	= "ecard",
	.match	= ecard_match,
};

static int ecard_bus_init(void)
{
	return bus_register(&ecard_bus_type);
}

postcore_initcall(ecard_bus_init);

EXPORT_SYMBOL(ecard_readchunk);
EXPORT_SYMBOL(ecard_address);
EXPORT_SYMBOL(ecard_register_driver);
EXPORT_SYMBOL(ecard_remove_driver);
EXPORT_SYMBOL(ecard_bus_type);