summaryrefslogtreecommitdiff
path: root/drivers/mtd/mtdpart.c
blob: 9c6236852942ec7e98441c5a333c1786a0e83a0c (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
/*
 * Simple MTD partitioning layer
 *
 * (C) 2000 Nicolas Pitre <nico@cam.org>
 *
 * This code is GPL
 *
 * $Id: mtdpart.c,v 1.55 2005/11/07 11:14:20 gleixner Exp $
 *
 * 	02-21-2002	Thomas Gleixner <gleixner@autronix.de>
 *			added support for read_oob, write_oob
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/kmod.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/compatmac.h>

/* Our partition linked list */
static LIST_HEAD(mtd_partitions);

/* Our partition node structure */
struct mtd_part {
	struct mtd_info mtd;
	struct mtd_info *master;
	u_int32_t offset;
	int index;
	struct list_head list;
	int registered;
};

/*
 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
 * the pointer to that structure with this macro.
 */
#define PART(x)  ((struct mtd_part *)(x))


/*
 * MTD methods which simply translate the effective address and pass through
 * to the _real_ device.
 */

static int part_read (struct mtd_info *mtd, loff_t from, size_t len,
			size_t *retlen, u_char *buf)
{
	struct mtd_part *part = PART(mtd);
	int res;

	if (from >= mtd->size)
		len = 0;
	else if (from + len > mtd->size)
		len = mtd->size - from;
	res = part->master->read (part->master, from + part->offset,
				   len, retlen, buf);
	if (unlikely(res)) {
		if (res == -EUCLEAN)
			mtd->ecc_stats.corrected++;
		if (res == -EBADMSG)
			mtd->ecc_stats.failed++;
	}
	return res;
}

static int part_point (struct mtd_info *mtd, loff_t from, size_t len,
			size_t *retlen, u_char **buf)
{
	struct mtd_part *part = PART(mtd);
	if (from >= mtd->size)
		len = 0;
	else if (from + len > mtd->size)
		len = mtd->size - from;
	return part->master->point (part->master, from + part->offset,
				    len, retlen, buf);
}

static void part_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
{
	struct mtd_part *part = PART(mtd);

	part->master->unpoint (part->master, addr, from + part->offset, len);
}

static int part_read_oob(struct mtd_info *mtd, loff_t from,
			 struct mtd_oob_ops *ops)
{
	struct mtd_part *part = PART(mtd);
	int res;

	if (from >= mtd->size)
		return -EINVAL;
	if (ops->datbuf && from + ops->len > mtd->size)
		return -EINVAL;
	res = part->master->read_oob(part->master, from + part->offset, ops);

	if (unlikely(res)) {
		if (res == -EUCLEAN)
			mtd->ecc_stats.corrected++;
		if (res == -EBADMSG)
			mtd->ecc_stats.failed++;
	}
	return res;
}

static int part_read_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
			size_t *retlen, u_char *buf)
{
	struct mtd_part *part = PART(mtd);
	return part->master->read_user_prot_reg (part->master, from,
					len, retlen, buf);
}

static int part_get_user_prot_info (struct mtd_info *mtd,
				    struct otp_info *buf, size_t len)
{
	struct mtd_part *part = PART(mtd);
	return part->master->get_user_prot_info (part->master, buf, len);
}

static int part_read_fact_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
			size_t *retlen, u_char *buf)
{
	struct mtd_part *part = PART(mtd);
	return part->master->read_fact_prot_reg (part->master, from,
					len, retlen, buf);
}

static int part_get_fact_prot_info (struct mtd_info *mtd,
				    struct otp_info *buf, size_t len)
{
	struct mtd_part *part = PART(mtd);
	return part->master->get_fact_prot_info (part->master, buf, len);
}

static int part_write (struct mtd_info *mtd, loff_t to, size_t len,
			size_t *retlen, const u_char *buf)
{
	struct mtd_part *part = PART(mtd);
	if (!(mtd->flags & MTD_WRITEABLE))
		return -EROFS;
	if (to >= mtd->size)
		len = 0;
	else if (to + len > mtd->size)
		len = mtd->size - to;
	return part->master->write (part->master, to + part->offset,
				    len, retlen, buf);
}

static int part_write_oob(struct mtd_info *mtd, loff_t to,
			 struct mtd_oob_ops *ops)
{
	struct mtd_part *part = PART(mtd);

	if (!(mtd->flags & MTD_WRITEABLE))
		return -EROFS;

	if (to >= mtd->size)
		return -EINVAL;
	if (ops->datbuf && to + ops->len > mtd->size)
		return -EINVAL;
	return part->master->write_oob(part->master, to + part->offset, ops);
}

static int part_write_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
			size_t *retlen, u_char *buf)
{
	struct mtd_part *part = PART(mtd);
	return part->master->write_user_prot_reg (part->master, from,
					len, retlen, buf);
}

static int part_lock_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len)
{
	struct mtd_part *part = PART(mtd);
	return part->master->lock_user_prot_reg (part->master, from, len);
}

static int part_writev (struct mtd_info *mtd,  const struct kvec *vecs,
			 unsigned long count, loff_t to, size_t *retlen)
{
	struct mtd_part *part = PART(mtd);
	if (!(mtd->flags & MTD_WRITEABLE))
		return -EROFS;
	return part->master->writev (part->master, vecs, count,
					to + part->offset, retlen);
}

static int part_erase (struct mtd_info *mtd, struct erase_info *instr)
{
	struct mtd_part *part = PART(mtd);
	int ret;
	if (!(mtd->flags & MTD_WRITEABLE))
		return -EROFS;
	if (instr->addr >= mtd->size)
		return -EINVAL;
	instr->addr += part->offset;
	ret = part->master->erase(part->master, instr);
	if (ret) {
		if (instr->fail_addr != 0xffffffff)
			instr->fail_addr -= part->offset;
		instr->addr -= part->offset;
	}
	return ret;
}

void mtd_erase_callback(struct erase_info *instr)
{
	if (instr->mtd->erase == part_erase) {
		struct mtd_part *part = PART(instr->mtd);

		if (instr->fail_addr != 0xffffffff)
			instr->fail_addr -= part->offset;
		instr->addr -= part->offset;
	}
	if (instr->callback)
		instr->callback(instr);
}
EXPORT_SYMBOL_GPL(mtd_erase_callback);

static int part_lock (struct mtd_info *mtd, loff_t ofs, size_t len)
{
	struct mtd_part *part = PART(mtd);
	if ((len + ofs) > mtd->size)
		return -EINVAL;
	return part->master->lock(part->master, ofs + part->offset, len);
}

static int part_unlock (struct mtd_info *mtd, loff_t ofs, size_t len)
{
	struct mtd_part *part = PART(mtd);
	if ((len + ofs) > mtd->size)
		return -EINVAL;
	return part->master->unlock(part->master, ofs + part->offset, len);
}

static void part_sync(struct mtd_info *mtd)
{
	struct mtd_part *part = PART(mtd);
	part->master->sync(part->master);
}

static int part_suspend(struct mtd_info *mtd)
{
	struct mtd_part *part = PART(mtd);
	return part->master->suspend(part->master);
}

static void part_resume(struct mtd_info *mtd)
{
	struct mtd_part *part = PART(mtd);
	part->master->resume(part->master);
}

static int part_block_isbad (struct mtd_info *mtd, loff_t ofs)
{
	struct mtd_part *part = PART(mtd);
	if (ofs >= mtd->size)
		return -EINVAL;
	ofs += part->offset;
	return part->master->block_isbad(part->master, ofs);
}

static int part_block_markbad (struct mtd_info *mtd, loff_t ofs)
{
	struct mtd_part *part = PART(mtd);
	int res;

	if (!(mtd->flags & MTD_WRITEABLE))
		return -EROFS;
	if (ofs >= mtd->size)
		return -EINVAL;
	ofs += part->offset;
	res = part->master->block_markbad(part->master, ofs);
	if (!res)
		mtd->ecc_stats.badblocks++;
	return res;
}

/*
 * This function unregisters and destroy all slave MTD objects which are
 * attached to the given master MTD object.
 */

int del_mtd_partitions(struct mtd_info *master)
{
	struct list_head *node;
	struct mtd_part *slave;

	for (node = mtd_partitions.next;
	     node != &mtd_partitions;
	     node = node->next) {
		slave = list_entry(node, struct mtd_part, list);
		if (slave->master == master) {
			struct list_head *prev = node->prev;
			__list_del(prev, node->next);
			if(slave->registered)
				del_mtd_device(&slave->mtd);
			kfree(slave);
			node = prev;
		}
	}

	return 0;
}

/*
 * This function, given a master MTD object and a partition table, creates
 * and registers slave MTD objects which are bound to the master according to
 * the partition definitions.
 * (Q: should we register the master MTD object as well?)
 */

int add_mtd_partitions(struct mtd_info *master,
		       const struct mtd_partition *parts,
		       int nbparts)
{
	struct mtd_part *slave;
	u_int32_t cur_offset = 0;
	int i;

	printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);

	for (i = 0; i < nbparts; i++) {

		/* allocate the partition structure */
		slave = kzalloc (sizeof(*slave), GFP_KERNEL);
		if (!slave) {
			printk ("memory allocation error while creating partitions for \"%s\"\n",
				master->name);
			del_mtd_partitions(master);
			return -ENOMEM;
		}
		list_add(&slave->list, &mtd_partitions);

		/* set up the MTD object for this partition */
		slave->mtd.type = master->type;
		slave->mtd.flags = master->flags & ~parts[i].mask_flags;
		slave->mtd.size = parts[i].size;
		slave->mtd.writesize = master->writesize;
		slave->mtd.oobsize = master->oobsize;
		slave->mtd.oobavail = master->oobavail;
		slave->mtd.subpage_sft = master->subpage_sft;

		slave->mtd.name = parts[i].name;
		slave->mtd.owner = master->owner;

		slave->mtd.read = part_read;
		slave->mtd.write = part_write;

		if(master->point && master->unpoint){
			slave->mtd.point = part_point;
			slave->mtd.unpoint = part_unpoint;
		}

		if (master->read_oob)
			slave->mtd.read_oob = part_read_oob;
		if (master->write_oob)
			slave->mtd.write_oob = part_write_oob;
		if(master->read_user_prot_reg)
			slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
		if(master->read_fact_prot_reg)
			slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
		if(master->write_user_prot_reg)
			slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
		if(master->lock_user_prot_reg)
			slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
		if(master->get_user_prot_info)
			slave->mtd.get_user_prot_info = part_get_user_prot_info;
		if(master->get_fact_prot_info)
			slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
		if (master->sync)
			slave->mtd.sync = part_sync;
		if (!i && master->suspend && master->resume) {
				slave->mtd.suspend = part_suspend;
				slave->mtd.resume = part_resume;
		}
		if (master->writev)
			slave->mtd.writev = part_writev;
		if (master->lock)
			slave->mtd.lock = part_lock;
		if (master->unlock)
			slave->mtd.unlock = part_unlock;
		if (master->block_isbad)
			slave->mtd.block_isbad = part_block_isbad;
		if (master->block_markbad)
			slave->mtd.block_markbad = part_block_markbad;
		slave->mtd.erase = part_erase;
		slave->master = master;
		slave->offset = parts[i].offset;
		slave->index = i;

		if (slave->offset == MTDPART_OFS_APPEND)
			slave->offset = cur_offset;
		if (slave->offset == MTDPART_OFS_NXTBLK) {
			slave->offset = cur_offset;
			if ((cur_offset % master->erasesize) != 0) {
				/* Round up to next erasesize */
				slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
				printk(KERN_NOTICE "Moving partition %d: "
				       "0x%08x -> 0x%08x\n", i,
				       cur_offset, slave->offset);
			}
		}
		if (slave->mtd.size == MTDPART_SIZ_FULL)
			slave->mtd.size = master->size - slave->offset;
		cur_offset = slave->offset + slave->mtd.size;

		printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
			slave->offset + slave->mtd.size, slave->mtd.name);

		/* let's do some sanity checks */
		if (slave->offset >= master->size) {
				/* let's register it anyway to preserve ordering */
			slave->offset = 0;
			slave->mtd.size = 0;
			printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
				parts[i].name);
		}
		if (slave->offset + slave->mtd.size > master->size) {
			slave->mtd.size = master->size - slave->offset;
			printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
				parts[i].name, master->name, slave->mtd.size);
		}
		if (master->numeraseregions>1) {
			/* Deal with variable erase size stuff */
			int i;
			struct mtd_erase_region_info *regions = master->eraseregions;

			/* Find the first erase regions which is part of this partition. */
			for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
				;

			for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
				if (slave->mtd.erasesize < regions[i].erasesize) {
					slave->mtd.erasesize = regions[i].erasesize;
				}
			}
		} else {
			/* Single erase size */
			slave->mtd.erasesize = master->erasesize;
		}

		if ((slave->mtd.flags & MTD_WRITEABLE) &&
		    (slave->offset % slave->mtd.erasesize)) {
			/* Doesn't start on a boundary of major erase size */
			/* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
			slave->mtd.flags &= ~MTD_WRITEABLE;
			printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
				parts[i].name);
		}
		if ((slave->mtd.flags & MTD_WRITEABLE) &&
		    (slave->mtd.size % slave->mtd.erasesize)) {
			slave->mtd.flags &= ~MTD_WRITEABLE;
			printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
				parts[i].name);
		}

		slave->mtd.ecclayout = master->ecclayout;
		if (master->block_isbad) {
			uint32_t offs = 0;

			while(offs < slave->mtd.size) {
				if (master->block_isbad(master,
							offs + slave->offset))
					slave->mtd.ecc_stats.badblocks++;
				offs += slave->mtd.erasesize;
			}
		}

		if(parts[i].mtdp)
		{	/* store the object pointer (caller may or may not register it */
			*parts[i].mtdp = &slave->mtd;
			slave->registered = 0;
		}
		else
		{
			/* register our partition */
			add_mtd_device(&slave->mtd);
			slave->registered = 1;
		}
	}

	return 0;
}

EXPORT_SYMBOL(add_mtd_partitions);
EXPORT_SYMBOL(del_mtd_partitions);

static DEFINE_SPINLOCK(part_parser_lock);
static LIST_HEAD(part_parsers);

static struct mtd_part_parser *get_partition_parser(const char *name)
{
	struct list_head *this;
	void *ret = NULL;
	spin_lock(&part_parser_lock);

	list_for_each(this, &part_parsers) {
		struct mtd_part_parser *p = list_entry(this, struct mtd_part_parser, list);

		if (!strcmp(p->name, name) && try_module_get(p->owner)) {
			ret = p;
			break;
		}
	}
	spin_unlock(&part_parser_lock);

	return ret;
}

int register_mtd_parser(struct mtd_part_parser *p)
{
	spin_lock(&part_parser_lock);
	list_add(&p->list, &part_parsers);
	spin_unlock(&part_parser_lock);

	return 0;
}

int deregister_mtd_parser(struct mtd_part_parser *p)
{
	spin_lock(&part_parser_lock);
	list_del(&p->list);
	spin_unlock(&part_parser_lock);
	return 0;
}

int parse_mtd_partitions(struct mtd_info *master, const char **types,
			 struct mtd_partition **pparts, unsigned long origin)
{
	struct mtd_part_parser *parser;
	int ret = 0;

	for ( ; ret <= 0 && *types; types++) {
		parser = get_partition_parser(*types);
#ifdef CONFIG_KMOD
		if (!parser && !request_module("%s", *types))
				parser = get_partition_parser(*types);
#endif
		if (!parser) {
			printk(KERN_NOTICE "%s partition parsing not available\n",
			       *types);
			continue;
		}
		ret = (*parser->parse_fn)(master, pparts, origin);
		if (ret > 0) {
			printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
			       ret, parser->name, master->name);
		}
		put_partition_parser(parser);
	}
	return ret;
}

EXPORT_SYMBOL_GPL(parse_mtd_partitions);
EXPORT_SYMBOL_GPL(register_mtd_parser);
EXPORT_SYMBOL_GPL(deregister_mtd_parser);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
MODULE_DESCRIPTION("Generic support for partitioning of MTD devices");