summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/core.c
blob: f44c6cfc69cf382ac119b12bcb1e97b360a34ddc (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
/*
 * (C) Copyright 2005
 * 2N Telekomunikace, a.s. <www.2n.cz>
 * Ladislav Michl <michl@2n.cz>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 */
#include <common.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/mtd.h>
#include <mtd/mtd-peb.h>
#include <mtd/ubi-user.h>
#include <cmdlinepart.h>
#include <filetype.h>
#include <init.h>
#include <xfuncs.h>
#include <driver.h>
#include <malloc.h>
#include <ioctl.h>
#include <nand.h>
#include <errno.h>
#include <of.h>

#include "mtd.h"

static LIST_HEAD(mtd_register_hooks);

/**
 * mtd_buf_all_ff - check if buffer contains only 0xff
 * @buf: buffer to check
 * @size: buffer size in bytes
 *
 * This function returns %1 if there are only 0xff bytes in @buf, and %0 if
 * something else was also found.
 */
int mtd_buf_all_ff(const void *buf, unsigned int len)
{
	while ((unsigned long)buf & 0x3) {
		if (*(const uint8_t *)buf != 0xff)
			return 0;
		len--;
		if (!len)
			return 1;
		buf++;
	}

	while (len > 0x3) {
		if (*(const uint32_t *)buf != 0xffffffff)
			return 0;

		len -= sizeof(uint32_t);
		if (!len)
			return 1;

		buf += sizeof(uint32_t);
	}

	while (len) {
		if (*(const uint8_t *)buf != 0xff)
			return 0;
		len--;
		buf++;
	}

	return 1;
}

/**
 * mtd_buf_check_pattern - check if buffer contains only a certain byte pattern.
 * @buf: buffer to check
 * @patt: the pattern to check
 * @size: buffer size in bytes
 *
 * This function returns %1 in there are only @patt bytes in @buf, and %0 if
 * something else was also found.
 */
int mtd_buf_check_pattern(const void *buf, uint8_t patt, int size)
{
	int i;

	for (i = 0; i < size; i++)
		if (((const uint8_t *)buf)[i] != patt)
			return 0;
	return 1;
}

static ssize_t mtd_op_read(struct cdev *cdev, void* buf, size_t count,
			  loff_t offset, ulong flags)
{
	struct mtd_info *mtd = cdev->priv;
	size_t retlen;
	int ret;

	dev_dbg(cdev->dev, "read ofs: 0x%08llx count: 0x%08zx\n",
			offset, count);

	ret = mtd_read(mtd, offset, count, &retlen, buf);
	if (ret < 0 && ret != -EUCLEAN)
		return ret;

	return retlen;
}

#define NOTALIGNED(x) (x & (mtd->writesize - 1)) != 0
#define MTDPGALG(x) ((x) & ~(mtd->writesize - 1))

#ifdef CONFIG_MTD_WRITE
static ssize_t mtd_op_write(struct cdev* cdev, const void *buf, size_t _count,
			  loff_t _offset, ulong flags)
{
	struct mtd_info *mtd = cdev->priv;
	size_t retlen;
	int ret;

	ret = mtd_write(mtd, _offset, _count, &retlen, buf);

	return ret ? ret : _count;
}

static struct mtd_erase_region_info *mtd_find_erase_region(struct mtd_info *mtd, loff_t offset)
{
	int i;

	for (i = 0; i < mtd->numeraseregions; i++) {
		struct mtd_erase_region_info *e = &mtd->eraseregions[i];
		if (offset > e->offset + e->erasesize * e->numblocks)
			continue;
		return e;
	}

	return NULL;
}

static loff_t __mtd_erase_round(loff_t x, uint32_t esize, int up)
{
	uint64_t dividend = x;
	uint32_t mod = do_div(dividend, esize);
	if (mod == 0)
		return x;
	if (up)
		x += esize;
	return x - mod;
}
#define mtd_erase_round_up(x, esize)	__mtd_erase_round(x, esize, 1)
#define mtd_erase_round_down(x, esize)	__mtd_erase_round(x, esize, 0)

static int mtd_erase_align(struct mtd_info *mtd, loff_t *count, loff_t *offset)
{
	struct mtd_erase_region_info *e;
	loff_t ofs;

	if (mtd->numeraseregions == 0) {
		ofs = mtd_erase_round_down(*offset, mtd->erasesize);
		*count += *offset - ofs;
		*count = mtd_erase_round_up(*count, mtd->erasesize);
		*offset = ofs;
		return 0;
	}

	e = mtd_find_erase_region(mtd, *offset);
	if (!e)
		return -EINVAL;

	ofs = mtd_erase_round_down(*offset, e->erasesize);
	*count += *offset - ofs;

	e = mtd_find_erase_region(mtd, *offset + *count);
	if (!e)
		return -EINVAL;

	*count = mtd_erase_round_up(*count, e->erasesize);
	*offset = ofs;

	return 0;
}

static int mtd_op_erase(struct cdev *cdev, loff_t count, loff_t offset)
{
	struct mtd_info *mtd = cdev->priv;
	struct erase_info erase;
	loff_t addr;
	int ret;

	if (mtd->flags & MTD_NO_ERASE)
		return -EOPNOTSUPP;

	ret = mtd_erase_align(mtd, &count, &offset);
	if (ret)
		return ret;

	memset(&erase, 0, sizeof(erase));
	erase.mtd = mtd;
	addr = offset;

	if (!mtd->block_isbad) {
		erase.addr = addr;
		erase.len = count;
		return mtd_erase(mtd, &erase);
	}

	erase.len = mtd->erasesize;

	while (count > 0) {
		dev_dbg(cdev->dev, "erase 0x%08llx len: 0x%08llx\n", addr, erase.len);

		if (mtd->allow_erasebad || (mtd->master && mtd->master->allow_erasebad))
			ret = 0;
		else
			ret = mtd_block_isbad(mtd, addr);

		erase.addr = addr;

		if (ret > 0) {
			printf("Skipping bad block at 0x%08llx\n", addr);
		} else {
			ret = mtd_erase(mtd, &erase);
			if (ret)
				return ret;
		}

		addr += mtd->erasesize;
		count -= count > mtd->erasesize ? mtd->erasesize : count;
	}

	return 0;
}

static int mtd_op_protect(struct cdev *cdev, size_t count, loff_t offset, int prot)
{
	struct mtd_info *mtd = cdev->priv;

	if (!mtd->unlock || !mtd->lock)
		return -ENOSYS;

	if (prot)
		return mtd_lock(mtd, offset, count);
	else
		return mtd_unlock(mtd, offset, count);
}

#endif /* CONFIG_MTD_WRITE */

int mtd_ioctl(struct cdev *cdev, int request, void *buf)
{
	int ret = 0;
	struct mtd_info *mtd = cdev->priv;
	struct mtd_info_user *user = buf;
#if (defined(CONFIG_NAND_ECC_HW) || defined(CONFIG_NAND_ECC_SOFT))
	struct mtd_ecc_stats *ecc = buf;
#endif
	struct region_info_user *reg = buf;
#ifdef CONFIG_MTD_WRITE
	struct erase_info_user *ei = buf;
#endif
	loff_t *offset = buf;

	switch (request) {
	case MEMGETBADBLOCK:
		dev_dbg(cdev->dev, "MEMGETBADBLOCK: 0x%08llx\n", *offset);
		ret = mtd_block_isbad(mtd, *offset);
		break;
#ifdef CONFIG_MTD_WRITE
	case MEMSETBADBLOCK:
		dev_dbg(cdev->dev, "MEMSETBADBLOCK: 0x%08llx\n", *offset);
		ret = mtd_block_markbad(mtd, *offset);
		break;
	case MEMSETGOODBLOCK:
		dev_dbg(cdev->dev, "MEMSETGOODBLOCK: 0x%08llx\n", *offset);
		ret = mtd_block_markgood(mtd, *offset);
		break;
	case MEMERASE:
		ret = mtd_op_erase(cdev, ei->length, ei->start + cdev->offset);
		break;
#endif
	case MEMGETINFO:
		user->type	= mtd->type;
		user->flags	= mtd->flags;
		user->size	= mtd->size;
		user->erasesize	= mtd->erasesize;
		user->writesize	= mtd->writesize;
		user->oobsize	= mtd->oobsize;
		user->subpagesize = mtd->writesize >> mtd->subpage_sft;
		user->mtd	= mtd;
		/* The below fields are obsolete */
		user->ecctype	= -1;
		user->eccsize	= 0;
		break;
#if (defined(CONFIG_NAND_ECC_HW) || defined(CONFIG_NAND_ECC_SOFT))
	case ECCGETSTATS:
		ecc->corrected = mtd->ecc_stats.corrected;
		ecc->failed = mtd->ecc_stats.failed;
		ecc->badblocks = mtd->ecc_stats.badblocks;
		ecc->bbtblocks = mtd->ecc_stats.bbtblocks;
		break;
#endif
	case MEMGETREGIONINFO:
		if (cdev->mtd) {
			unsigned long size = cdev->size;
			reg->offset = cdev->offset;
			reg->erasesize = cdev->mtd->erasesize;
			reg->numblocks = size / reg->erasesize;
			reg->regionindex = cdev->mtd->index;
		}
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
	if (!mtd->lock)
		return -EOPNOTSUPP;
	if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs)
		return -EINVAL;
	if (!len)
		return 0;
	return mtd->lock(mtd, ofs, len);
}

int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
	if (!mtd->unlock)
		return -EOPNOTSUPP;
	if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs)
		return -EINVAL;
	if (!len)
		return 0;
	return mtd->unlock(mtd, ofs, len);
}

int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
	if (!mtd->block_isbad)
		return 0;

	if (ofs < 0 || ofs > mtd->size)
		return -EINVAL;

	return mtd->block_isbad(mtd, ofs);
}

int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
	int ret;

	if (ofs < 0 || ofs >= mtd->size)
		return -EINVAL;

	if (mtd->block_markbad)
		ret = mtd->block_markbad(mtd, ofs);
	else
		ret = -ENOSYS;

	return ret;
}

int mtd_block_markgood(struct mtd_info *mtd, loff_t ofs)
{
	int ret;

	if (mtd->block_markgood)
		ret = mtd->block_markgood(mtd, ofs);
	else
		ret = -ENOSYS;

	return ret;
}

int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
		u_char *buf)
{
	int ret_code;
	*retlen = 0;

	if (from < 0 || from >= mtd->size || len > mtd->size - from)
		return -EINVAL;
	if (!len)
		return 0;

	/*
	 * In the absence of an error, drivers return a non-negative integer
	 * representing the maximum number of bitflips that were corrected on
	 * any one ecc region (if applicable; zero otherwise).
	 */
	ret_code = mtd->read(mtd, from, len, retlen, buf);
	if (unlikely(ret_code < 0))
		return ret_code;
	if (mtd->ecc_strength == 0)
		return 0;	/* device lacks ecc */
	return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0;
}

int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
		const u_char *buf)
{
	*retlen = 0;

	if (to < 0 || to >= mtd->size || len > mtd->size - to)
		return -EINVAL;
	if (!mtd->write || !(mtd->flags & MTD_WRITEABLE))
		return -EROFS;
	if (!len)
		return 0;

	return mtd->write(mtd, to, len, retlen, buf);
}

int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
{
	if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr)
		return -EINVAL;
	if (!(mtd->flags & MTD_WRITEABLE))
		return -EROFS;
	instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
	if (!instr->len) {
		instr->state = MTD_ERASE_DONE;
		mtd_erase_callback(instr);
		return 0;
	}
	return mtd->erase(mtd, instr);
}

int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
{
	int ret_code;

	ops->retlen = ops->oobretlen = 0;
	if (!mtd->read_oob)
		return -EOPNOTSUPP;
	/*
	 * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics
	 * similar to mtd->_read(), returning a non-negative integer
	 * representing max bitflips. In other cases, mtd->_read_oob() may
	 * return -EUCLEAN. In all cases, perform similar logic to mtd_read().
	 */
	ret_code = mtd->read_oob(mtd, from, ops);
	if (unlikely(ret_code < 0))
		return ret_code;
	if (mtd->ecc_strength == 0)
		return 0;	/* device lacks ecc */
	return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0;
}

static struct cdev_operations mtd_ops = {
	.read   = mtd_op_read,
#ifdef CONFIG_MTD_WRITE
	.write  = mtd_op_write,
	.erase  = mtd_op_erase,
	.protect = mtd_op_protect,
#endif
	.ioctl  = mtd_ioctl,
	.lseek  = dev_lseek_default,
};

static int mtd_partition_set(struct param_d *p, void *priv)
{
	struct mtd_info *mtd = priv;
	struct mtd_info *mtdpart, *tmp;
	int ret;

	if (!mtd->partition_string)
		return -EINVAL;

	list_for_each_entry_safe(mtdpart, tmp, &mtd->partitions, partitions_entry) {
		ret = mtd_del_partition(mtdpart);
		if (ret)
			return ret;
	}

	return cmdlinepart_do_parse(mtd->cdev.name, mtd->partition_string, mtd->size, CMDLINEPART_ADD_DEVNAME);
}

static char *print_size(uint64_t s)
{
	if (!(s & ((1 << 20) - 1)))
		return basprintf("%lldM", s >> 20);
	if (!(s & ((1 << 10) - 1)))
		return basprintf("%lldk", s >> 10);
	return basprintf("0x%llx", s);
}

static int print_part(char *buf, int bufsize, struct mtd_info *mtd, uint64_t last_ofs,
		int is_last)
{
	char *size = print_size(mtd->size);
	char *ofs = print_size(mtd->master_offset);
	int ret;

	if (!size || !ofs) {
		ret = -ENOMEM;
		goto out;
	}

	if (mtd->master_offset == last_ofs)
		ret = snprintf(buf, bufsize, "%s(%s)%s", size,
				mtd->cdev.partname,
				is_last ? "" : ",");
	else
		ret = snprintf(buf, bufsize, "%s@%s(%s)%s", size,
				ofs,
				mtd->cdev.partname,
				is_last ? "" : ",");
out:
	free(size);
	free(ofs);

	return ret;
}

static int print_parts(char *buf, int bufsize, struct mtd_info *mtd)
{
	struct mtd_info *mtdpart;
	uint64_t last_ofs = 0;
	int ret = 0;

	list_for_each_entry(mtdpart, &mtd->partitions, partitions_entry) {
		int now;
		int is_last = list_is_last(&mtdpart->partitions_entry,
					&mtd->partitions);

		now = print_part(buf, bufsize, mtdpart, last_ofs, is_last);
		if (now < 0)
			return now;

		if (buf && bufsize) {
			buf += now;
			bufsize -= now;
		}
		ret += now;
		last_ofs = mtdpart->master_offset + mtdpart->size;
	}

	return ret;
}

static int mtd_partition_get(struct param_d *p, void *priv)
{
	struct mtd_info *mtd = priv;
	int len = 0;

	free(mtd->partition_string);

	len = print_parts(NULL, 0, mtd);
	mtd->partition_string = xzalloc(len + 1);
	print_parts(mtd->partition_string, len + 1, mtd);

	return 0;
}

static int mtd_part_compare(struct list_head *a, struct list_head *b)
{
	struct mtd_info *mtda = container_of(a, struct mtd_info, partitions_entry);
	struct mtd_info *mtdb = container_of(b, struct mtd_info, partitions_entry);

	if (mtda->master_offset > mtdb->master_offset)
		return 1;
	if (mtda->master_offset < mtdb->master_offset)
		return -1;
	return 0;
}

static int mtd_detect(struct device_d *dev)
{
	struct mtd_info *mtd = container_of(dev, struct mtd_info, class_dev);
	int bufsize = 512;
	void *buf;
	int ret = 0, i;
	enum filetype filetype;
	int npebs = mtd_div_by_eb(mtd->size, mtd);

	npebs = max(npebs, 64);

	/*
	 * Do not try to attach an UBI device if this device has partitions
	 * as it's not a good idea to attach UBI on a raw device when the
	 * real UBI only spans the first partition.
	 */
	if (!list_empty(&mtd->partitions))
		return -EBUSY;

	buf = xmalloc(bufsize);

	for (i = 0; i < npebs; i++) {
		if (mtd_peb_is_bad(mtd, i))
			continue;

		ret = mtd_peb_read(mtd, buf, i, 0, 512);
		if (ret)
			continue;

		if (mtd_buf_all_ff(buf, 512))
			continue;

		filetype = file_detect_type(buf, bufsize);
		if (filetype == filetype_ubi && ubi_num_get_by_mtd(mtd) < 0)
			ret = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, 0, 20);

		break;
	}

	free(buf);

	return ret;
}

int add_mtd_device(struct mtd_info *mtd, const char *devname, int device_id)
{
	struct mtddev_hook *hook;
	int ret;

	if (!devname)
		devname = "mtd";
	dev_set_name(&mtd->class_dev, devname);
	mtd->class_dev.id = device_id;
	if (mtd->parent)
		mtd->class_dev.parent = mtd->parent;

	if (IS_ENABLED(CONFIG_MTD_UBI))
		mtd->class_dev.detect = mtd_detect;

	ret = register_device(&mtd->class_dev);
	if (ret)
		return ret;

	mtd->cdev.ops = &mtd_ops;
	mtd->cdev.size = mtd->size;
	if (device_id == DEVICE_ID_SINGLE)
		mtd->cdev.name = xstrdup(devname);
	else
		mtd->cdev.name = basprintf("%s%d", devname,
					     mtd->class_dev.id);

	INIT_LIST_HEAD(&mtd->partitions);

	mtd->cdev.priv = mtd;
	mtd->cdev.dev = &mtd->class_dev;
	mtd->cdev.mtd = mtd;

	if (IS_ENABLED(CONFIG_PARAMETER)) {
		dev_add_param_uint64_ro(&mtd->class_dev, "size", &mtd->size, "%llu");
		dev_add_param_uint32_ro(&mtd->class_dev, "erasesize", &mtd->erasesize, "%u");
		dev_add_param_uint32_ro(&mtd->class_dev, "writesize", &mtd->writesize, "%u");
		dev_add_param_uint32_ro(&mtd->class_dev, "oobsize", &mtd->oobsize, "%u");
	}

	ret = devfs_create(&mtd->cdev);
	if (ret)
		goto err;

	if (mtd->master && !(mtd->cdev.flags & DEVFS_PARTITION_FIXED)) {
		struct mtd_info *mtdpart;

		list_for_each_entry(mtdpart, &mtd->master->partitions, partitions_entry) {
			if (mtdpart->master_offset + mtdpart->size <= mtd->master_offset)
				continue;
			if (mtd->master_offset + mtd->size <= mtdpart->master_offset)
				continue;
			dev_err(&mtd->class_dev, "New partition %s conflicts with %s\n",
					mtd->name, mtdpart->name);
			goto err1;
		}

		list_add_sort(&mtd->partitions_entry, &mtd->master->partitions, mtd_part_compare);
	}

	if (mtd_can_have_bb(mtd))
		mtd->cdev_bb = mtd_add_bb(mtd, NULL);

	if (mtd->parent && !mtd->master) {
		dev_add_param_string(&mtd->class_dev, "partitions", mtd_partition_set, mtd_partition_get, &mtd->partition_string, mtd);
		of_parse_partitions(&mtd->cdev, mtd->parent->device_node);
		if (IS_ENABLED(CONFIG_OFDEVICE) && mtd->parent->device_node) {
			mtd->of_path = xstrdup(mtd->parent->device_node->full_name);
			ret = of_partitions_register_fixup(&mtd->cdev);
			if (ret)
				goto err1;
		}
	}

	list_for_each_entry(hook, &mtd_register_hooks, hook)
		if (hook->add_mtd_device)
			hook->add_mtd_device(mtd, devname, &hook->priv);

	return 0;
err1:
	devfs_remove(&mtd->cdev);
err:
	free(mtd->cdev.name);
	unregister_device(&mtd->class_dev);

	return ret;
}

int del_mtd_device (struct mtd_info *mtd)
{
	struct mtddev_hook *hook;

	list_for_each_entry(hook, &mtd_register_hooks, hook)
		if (hook->del_mtd_device)
			hook->del_mtd_device(mtd, &hook->priv);

	devfs_remove(&mtd->cdev);
	if (mtd->cdev_bb)
		mtd_del_bb(mtd);
	unregister_device(&mtd->class_dev);
	free(mtd->param_size.value);
	free(mtd->cdev.name);
	if (mtd->master)
		list_del(&mtd->partitions_entry);

	return 0;
}

void mtdcore_add_hook(struct mtddev_hook *hook)
{
	list_add(&hook->hook, &mtd_register_hooks);
}

const char *mtd_type_str(struct mtd_info *mtd)
{
	switch (mtd->type) {
	case MTD_ABSENT:
		return "absent";
	case MTD_RAM:
		return "ram";
	case MTD_ROM:
		return "rom";
	case MTD_NORFLASH:
		return "nor";
	case MTD_NANDFLASH:
		return "nand";
	case MTD_DATAFLASH:
		return"dataflash";
	case MTD_UBIVOLUME:
		return "ubi";
	default:
		return "unknown";
	}
}