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MTD: nandsim: use less RAM
[deliverable/linux.git] / drivers / mtd / mtdpart.c
CommitLineData
1da177e4
LT		 1/*
2 * Simple MTD partitioning layer
3 *
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
5 *
6 * This code is GPL
7 *
1da177e4
LT		 8 * 02-21-2002 Thomas Gleixner <gleixner@autronix.de>
9 * added support for read_oob, write_oob
97894cda 10 */
1da177e4
LT		 11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/list.h>
1da177e4
LT		 17#include <linux/kmod.h>
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/partitions.h>
20#include <linux/mtd/compatmac.h>
21
22/* Our partition linked list */
23static LIST_HEAD(mtd_partitions);
24
25/* Our partition node structure */
26struct mtd_part {
27 struct mtd_info mtd;
28 struct mtd_info *master;
29 u_int32_t offset;
30 int index;
31 struct list_head list;
32 int registered;
33};
34
35/*
36 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
37 * the pointer to that structure with this macro.
38 */
39#define PART(x) ((struct mtd_part *)(x))
40
97894cda
TG		 41
42/*
1da177e4
LT		 43 * MTD methods which simply translate the effective address and pass through
44 * to the _real_ device.
45 */
46
b33a2887
AN		 47static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
48 size_t *retlen, u_char *buf)
1da177e4
LT		 49{
50 struct mtd_part *part = PART(mtd);
f1a28c02
TG		 51 int res;
52
1da177e4
LT		 53 if (from >= mtd->size)
54 len = 0;
55 else if (from + len > mtd->size)
56 len = mtd->size - from;
b33a2887 57 res = part->master->read(part->master, from + part->offset,
9223a456 58 len, retlen, buf);
f1a28c02
TG		 59 if (unlikely(res)) {
60 if (res == -EUCLEAN)
61 mtd->ecc_stats.corrected++;
62 if (res == -EBADMSG)
63 mtd->ecc_stats.failed++;
64 }
65 return res;
1da177e4
LT		 66}
67
b33a2887
AN		 68static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
69 size_t *retlen, void **virt, resource_size_t *phys)
1da177e4
LT		 70{
71 struct mtd_part *part = PART(mtd);
72 if (from >= mtd->size)
73 len = 0;
74 else if (from + len > mtd->size)
75 len = mtd->size - from;
97894cda 76 return part->master->point (part->master, from + part->offset,
a98889f3 77 len, retlen, virt, phys);
1da177e4 78}
9223a456 79
a98889f3 80static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
1da177e4
LT		 81{
82 struct mtd_part *part = PART(mtd);
83
a98889f3 84 part->master->unpoint(part->master, from + part->offset, len);
1da177e4
LT		 85}
86
8593fbc6 87static int part_read_oob(struct mtd_info *mtd, loff_t from,
b33a2887 88 struct mtd_oob_ops *ops)
1da177e4
LT		 89{
90 struct mtd_part *part = PART(mtd);
f1a28c02 91 int res;
8593fbc6 92
1da177e4 93 if (from >= mtd->size)
8593fbc6 94 return -EINVAL;
7014568b 95 if (ops->datbuf && from + ops->len > mtd->size)
8593fbc6 96 return -EINVAL;
f1a28c02
TG		 97 res = part->master->read_oob(part->master, from + part->offset, ops);
98
99 if (unlikely(res)) {
100 if (res == -EUCLEAN)
101 mtd->ecc_stats.corrected++;
102 if (res == -EBADMSG)
103 mtd->ecc_stats.failed++;
104 }
105 return res;
1da177e4
LT		 106}
107
b33a2887
AN		 108static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
109 size_t len, size_t *retlen, u_char *buf)
1da177e4
LT		 110{
111 struct mtd_part *part = PART(mtd);
b33a2887 112 return part->master->read_user_prot_reg(part->master, from,
1da177e4
LT		 113 len, retlen, buf);
114}
115
b33a2887
AN		 116static int part_get_user_prot_info(struct mtd_info *mtd,
117 struct otp_info *buf, size_t len)
f77814dd
NP		 118{
119 struct mtd_part *part = PART(mtd);
b33a2887 120 return part->master->get_user_prot_info(part->master, buf, len);
f77814dd
NP		 121}
122
b33a2887
AN		 123static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
124 size_t len, size_t *retlen, u_char *buf)
1da177e4
LT		 125{
126 struct mtd_part *part = PART(mtd);
b33a2887 127 return part->master->read_fact_prot_reg(part->master, from,
1da177e4
LT		 128 len, retlen, buf);
129}
130
b33a2887
AN		 131static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
132 size_t len)
f77814dd
NP		 133{
134 struct mtd_part *part = PART(mtd);
b33a2887 135 return part->master->get_fact_prot_info(part->master, buf, len);
f77814dd
NP		 136}
137
b33a2887
AN		 138static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
139 size_t *retlen, const u_char *buf)
1da177e4
LT		 140{
141 struct mtd_part *part = PART(mtd);
142 if (!(mtd->flags & MTD_WRITEABLE))
143 return -EROFS;
144 if (to >= mtd->size)
145 len = 0;
146 else if (to + len > mtd->size)
147 len = mtd->size - to;
b33a2887 148 return part->master->write(part->master, to + part->offset,
9223a456 149 len, retlen, buf);
1da177e4
LT		 150}
151
b33a2887
AN		 152static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
153 size_t *retlen, const u_char *buf)
388bbb09
RP		 154{
155 struct mtd_part *part = PART(mtd);
156 if (!(mtd->flags & MTD_WRITEABLE))
157 return -EROFS;
158 if (to >= mtd->size)
159 len = 0;
160 else if (to + len > mtd->size)
161 len = mtd->size - to;
b33a2887 162 return part->master->panic_write(part->master, to + part->offset,
388bbb09
RP		 163 len, retlen, buf);
164}
165
8593fbc6 166static int part_write_oob(struct mtd_info *mtd, loff_t to,
b33a2887 167 struct mtd_oob_ops *ops)
1da177e4
LT		 168{
169 struct mtd_part *part = PART(mtd);
8593fbc6 170
1da177e4
LT		 171 if (!(mtd->flags & MTD_WRITEABLE))
172 return -EROFS;
8593fbc6 173
1da177e4 174 if (to >= mtd->size)
8593fbc6 175 return -EINVAL;
7014568b 176 if (ops->datbuf && to + ops->len > mtd->size)
8593fbc6
TG		 177 return -EINVAL;
178 return part->master->write_oob(part->master, to + part->offset, ops);
1da177e4
LT		 179}
180
b33a2887
AN		 181static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
182 size_t len, size_t *retlen, u_char *buf)
1da177e4
LT		 183{
184 struct mtd_part *part = PART(mtd);
b33a2887 185 return part->master->write_user_prot_reg(part->master, from,
1da177e4
LT		 186 len, retlen, buf);
187}
188
b33a2887
AN		 189static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
190 size_t len)
f77814dd
NP		 191{
192 struct mtd_part *part = PART(mtd);
b33a2887 193 return part->master->lock_user_prot_reg(part->master, from, len);
f77814dd
NP		 194}
195
b33a2887
AN		 196static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
197 unsigned long count, loff_t to, size_t *retlen)
1da177e4
LT		 198{
199 struct mtd_part *part = PART(mtd);
200 if (!(mtd->flags & MTD_WRITEABLE))
201 return -EROFS;
b33a2887 202 return part->master->writev(part->master, vecs, count,
1da177e4 203 to + part->offset, retlen);
1da177e4
LT		 204}
205
b33a2887 206static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
1da177e4
LT		 207{
208 struct mtd_part *part = PART(mtd);
209 int ret;
210 if (!(mtd->flags & MTD_WRITEABLE))
211 return -EROFS;
212 if (instr->addr >= mtd->size)
213 return -EINVAL;
214 instr->addr += part->offset;
215 ret = part->master->erase(part->master, instr);
74641d75 216 if (ret) {
bb0eb217 217 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
74641d75
AH		 218 instr->fail_addr -= part->offset;
219 instr->addr -= part->offset;
220 }
1da177e4
LT		 221 return ret;
222}
223
224void mtd_erase_callback(struct erase_info *instr)
225{
226 if (instr->mtd->erase == part_erase) {
227 struct mtd_part *part = PART(instr->mtd);
228
bb0eb217 229 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
1da177e4
LT		 230 instr->fail_addr -= part->offset;
231 instr->addr -= part->offset;
232 }
233 if (instr->callback)
234 instr->callback(instr);
235}
236EXPORT_SYMBOL_GPL(mtd_erase_callback);
237
b33a2887 238static int part_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
1da177e4
LT		 239{
240 struct mtd_part *part = PART(mtd);
97894cda 241 if ((len + ofs) > mtd->size)
1da177e4
LT		 242 return -EINVAL;
243 return part->master->lock(part->master, ofs + part->offset, len);
244}
245
b33a2887 246static int part_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
1da177e4
LT		 247{
248 struct mtd_part *part = PART(mtd);
97894cda 249 if ((len + ofs) > mtd->size)
1da177e4
LT		 250 return -EINVAL;
251 return part->master->unlock(part->master, ofs + part->offset, len);
252}
253
254static void part_sync(struct mtd_info *mtd)
255{
256 struct mtd_part *part = PART(mtd);
257 part->master->sync(part->master);
258}
259
260static int part_suspend(struct mtd_info *mtd)
261{
262 struct mtd_part *part = PART(mtd);
263 return part->master->suspend(part->master);
264}
265
266static void part_resume(struct mtd_info *mtd)
267{
268 struct mtd_part *part = PART(mtd);
269 part->master->resume(part->master);
270}
271
b33a2887 272static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
1da177e4
LT		 273{
274 struct mtd_part *part = PART(mtd);
275 if (ofs >= mtd->size)
276 return -EINVAL;
277 ofs += part->offset;
278 return part->master->block_isbad(part->master, ofs);
279}
280
b33a2887 281static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
1da177e4
LT		 282{
283 struct mtd_part *part = PART(mtd);
f1a28c02
TG		 284 int res;
285
1da177e4
LT		 286 if (!(mtd->flags & MTD_WRITEABLE))
287 return -EROFS;
288 if (ofs >= mtd->size)
289 return -EINVAL;
290 ofs += part->offset;
f1a28c02
TG		 291 res = part->master->block_markbad(part->master, ofs);
292 if (!res)
293 mtd->ecc_stats.badblocks++;
294 return res;
1da177e4
LT		 295}
296
97894cda
TG		 297/*
298 * This function unregisters and destroy all slave MTD objects which are
1da177e4
LT		 299 * attached to the given master MTD object.
300 */
301
302int del_mtd_partitions(struct mtd_info *master)
303{
71a928c0 304 struct mtd_part *slave, *next;
1da177e4 305
71a928c0 306 list_for_each_entry_safe(slave, next, &mtd_partitions, list)
1da177e4 307 if (slave->master == master) {
71a928c0 308 list_del(&slave->list);
b33a2887 309 if (slave->registered)
1da177e4
LT		 310 del_mtd_device(&slave->mtd);
311 kfree(slave);
1da177e4 312 }
1da177e4
LT		 313
314 return 0;
315}
b33a2887 316EXPORT_SYMBOL(del_mtd_partitions);
1da177e4 317
7788ba71
AN		 318static struct mtd_part *add_one_partition(struct mtd_info *master,
319 const struct mtd_partition *part, int partno,
320 u_int32_t cur_offset)
321{
322 struct mtd_part *slave;
323
324 /* allocate the partition structure */
b33a2887 325 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
7788ba71 326 if (!slave) {
b33a2887 327 printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
7788ba71
AN		 328 master->name);
329 del_mtd_partitions(master);
330 return NULL;
331 }
332 list_add(&slave->list, &mtd_partitions);
333
334 /* set up the MTD object for this partition */
335 slave->mtd.type = master->type;
336 slave->mtd.flags = master->flags & ~part->mask_flags;
337 slave->mtd.size = part->size;
338 slave->mtd.writesize = master->writesize;
339 slave->mtd.oobsize = master->oobsize;
340 slave->mtd.oobavail = master->oobavail;
341 slave->mtd.subpage_sft = master->subpage_sft;
342
343 slave->mtd.name = part->name;
344 slave->mtd.owner = master->owner;
345
346 slave->mtd.read = part_read;
347 slave->mtd.write = part_write;
348
349 if (master->panic_write)
350 slave->mtd.panic_write = part_panic_write;
351
b33a2887 352 if (master->point && master->unpoint) {
7788ba71
AN		 353 slave->mtd.point = part_point;
354 slave->mtd.unpoint = part_unpoint;
355 }
356
357 if (master->read_oob)
358 slave->mtd.read_oob = part_read_oob;
359 if (master->write_oob)
360 slave->mtd.write_oob = part_write_oob;
b33a2887 361 if (master->read_user_prot_reg)
7788ba71 362 slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
b33a2887 363 if (master->read_fact_prot_reg)
7788ba71 364 slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
b33a2887 365 if (master->write_user_prot_reg)
7788ba71 366 slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
b33a2887 367 if (master->lock_user_prot_reg)
7788ba71 368 slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
b33a2887 369 if (master->get_user_prot_info)
7788ba71 370 slave->mtd.get_user_prot_info = part_get_user_prot_info;
b33a2887 371 if (master->get_fact_prot_info)
7788ba71
AN		 372 slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
373 if (master->sync)
374 slave->mtd.sync = part_sync;
375 if (!partno && master->suspend && master->resume) {
376 slave->mtd.suspend = part_suspend;
377 slave->mtd.resume = part_resume;
378 }
379 if (master->writev)
380 slave->mtd.writev = part_writev;
381 if (master->lock)
382 slave->mtd.lock = part_lock;
383 if (master->unlock)
384 slave->mtd.unlock = part_unlock;
385 if (master->block_isbad)
386 slave->mtd.block_isbad = part_block_isbad;
387 if (master->block_markbad)
388 slave->mtd.block_markbad = part_block_markbad;
389 slave->mtd.erase = part_erase;
390 slave->master = master;
391 slave->offset = part->offset;
392 slave->index = partno;
393
394 if (slave->offset == MTDPART_OFS_APPEND)
395 slave->offset = cur_offset;
396 if (slave->offset == MTDPART_OFS_NXTBLK) {
397 slave->offset = cur_offset;
398 if ((cur_offset % master->erasesize) != 0) {
399 /* Round up to next erasesize */
400 slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
401 printk(KERN_NOTICE "Moving partition %d: "
402 "0x%08x -> 0x%08x\n", partno,
403 cur_offset, slave->offset);
404 }
405 }
406 if (slave->mtd.size == MTDPART_SIZ_FULL)
407 slave->mtd.size = master->size - slave->offset;
408
b33a2887 409 printk(KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
7788ba71
AN		 410 slave->offset + slave->mtd.size, slave->mtd.name);
411
412 /* let's do some sanity checks */
413 if (slave->offset >= master->size) {
f636ffb4 414 /* let's register it anyway to preserve ordering */
7788ba71
AN		 415 slave->offset = 0;
416 slave->mtd.size = 0;
b33a2887 417 printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
7788ba71 418 part->name);
f636ffb4 419 goto out_register;
7788ba71
AN		 420 }
421 if (slave->offset + slave->mtd.size > master->size) {
422 slave->mtd.size = master->size - slave->offset;
b33a2887 423 printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
7788ba71
AN		 424 part->name, master->name, slave->mtd.size);
425 }
b33a2887 426 if (master->numeraseregions > 1) {
7788ba71 427 /* Deal with variable erase size stuff */
6910c136
AN		 428 int i, max = master->numeraseregions;
429 u32 end = slave->offset + slave->mtd.size;
7788ba71
AN		 430 struct mtd_erase_region_info *regions = master->eraseregions;
431
6910c136
AN		 432 /* Find the first erase regions which is part of this
433 * partition. */
434 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
7788ba71 435 ;
6910c136
AN		 436 /* The loop searched for the region _behind_ the first one */
437 i--;
7788ba71 438
6910c136
AN		 439 /* Pick biggest erasesize */
440 for (; i < max && regions[i].offset < end; i++) {
7788ba71
AN		 441 if (slave->mtd.erasesize < regions[i].erasesize) {
442 slave->mtd.erasesize = regions[i].erasesize;
443 }
444 }
6910c136 445 BUG_ON(slave->mtd.erasesize == 0);
7788ba71
AN		 446 } else {
447 /* Single erase size */
448 slave->mtd.erasesize = master->erasesize;
449 }
450
451 if ((slave->mtd.flags & MTD_WRITEABLE) &&
452 (slave->offset % slave->mtd.erasesize)) {
453 /* Doesn't start on a boundary of major erase size */
b33a2887
AN		 454 /* FIXME: Let it be writable if it is on a boundary of
455 * _minor_ erase size though */
7788ba71 456 slave->mtd.flags &= ~MTD_WRITEABLE;
b33a2887 457 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
7788ba71
AN		 458 part->name);
459 }
460 if ((slave->mtd.flags & MTD_WRITEABLE) &&
461 (slave->mtd.size % slave->mtd.erasesize)) {
462 slave->mtd.flags &= ~MTD_WRITEABLE;
b33a2887 463 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
7788ba71
AN		 464 part->name);
465 }
466
467 slave->mtd.ecclayout = master->ecclayout;
468 if (master->block_isbad) {
469 uint32_t offs = 0;
470
b33a2887 471 while (offs < slave->mtd.size) {
7788ba71
AN		 472 if (master->block_isbad(master,
473 offs + slave->offset))
474 slave->mtd.ecc_stats.badblocks++;
475 offs += slave->mtd.erasesize;
476 }
477 }
478
f636ffb4 479out_register:
b33a2887
AN		 480 if (part->mtdp) {
481 /* store the object pointer (caller may or may not register it*/
7788ba71
AN		 482 *part->mtdp = &slave->mtd;
483 slave->registered = 0;
484 } else {
485 /* register our partition */
486 add_mtd_device(&slave->mtd);
487 slave->registered = 1;
488 }
489 return slave;
490}
491
1da177e4
LT		 492/*
493 * This function, given a master MTD object and a partition table, creates
494 * and registers slave MTD objects which are bound to the master according to
495 * the partition definitions.
496 * (Q: should we register the master MTD object as well?)
497 */
498
97894cda 499int add_mtd_partitions(struct mtd_info *master,
1da177e4
LT		 500 const struct mtd_partition *parts,
501 int nbparts)
502{
503 struct mtd_part *slave;
504 u_int32_t cur_offset = 0;
505 int i;
506
b33a2887 507 printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
1da177e4
LT		 508
509 for (i = 0; i < nbparts; i++) {
7788ba71
AN		 510 slave = add_one_partition(master, parts + i, i, cur_offset);
511 if (!slave)
1da177e4 512 return -ENOMEM;
1da177e4 513 cur_offset = slave->offset + slave->mtd.size;
1da177e4
LT		 514 }
515
516 return 0;
517}
1da177e4 518EXPORT_SYMBOL(add_mtd_partitions);
1da177e4
LT		 519
520static DEFINE_SPINLOCK(part_parser_lock);
521static LIST_HEAD(part_parsers);
522
523static struct mtd_part_parser *get_partition_parser(const char *name)
524{
71a928c0 525 struct mtd_part_parser *p, *ret = NULL;
1da177e4 526
71a928c0 527 spin_lock(&part_parser_lock);
1da177e4 528
71a928c0 529 list_for_each_entry(p, &part_parsers, list)
1da177e4
LT		 530 if (!strcmp(p->name, name) && try_module_get(p->owner)) {
531 ret = p;
532 break;
533 }
71a928c0 534
1da177e4
LT		 535 spin_unlock(&part_parser_lock);
536
537 return ret;
538}
539
540int register_mtd_parser(struct mtd_part_parser *p)
541{
542 spin_lock(&part_parser_lock);
543 list_add(&p->list, &part_parsers);
544 spin_unlock(&part_parser_lock);
545
546 return 0;
547}
b33a2887 548EXPORT_SYMBOL_GPL(register_mtd_parser);
1da177e4
LT		 549
550int deregister_mtd_parser(struct mtd_part_parser *p)
551{
552 spin_lock(&part_parser_lock);
553 list_del(&p->list);
554 spin_unlock(&part_parser_lock);
555 return 0;
556}
b33a2887 557EXPORT_SYMBOL_GPL(deregister_mtd_parser);
1da177e4 558
97894cda 559int parse_mtd_partitions(struct mtd_info *master, const char **types,
1da177e4
LT		 560 struct mtd_partition **pparts, unsigned long origin)
561{
562 struct mtd_part_parser *parser;
563 int ret = 0;
97894cda 564
1da177e4
LT		 565 for ( ; ret <= 0 && *types; types++) {
566 parser = get_partition_parser(*types);
1da177e4
LT		 567 if (!parser && !request_module("%s", *types))
568 parser = get_partition_parser(*types);
1da177e4
LT		 569 if (!parser) {
570 printk(KERN_NOTICE "%s partition parsing not available\n",
571 *types);
572 continue;
573 }
574 ret = (*parser->parse_fn)(master, pparts, origin);
575 if (ret > 0) {
97894cda 576 printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
1da177e4
LT		 577 ret, parser->name, master->name);
578 }
579 put_partition_parser(parser);
580 }
581 return ret;
582}
1da177e4 583EXPORT_SYMBOL_GPL(parse_mtd_partitions);
Linux kernel - Deliverables
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