2 * Simple MTD partitioning layer
4 * Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
5 * Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
6 * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/list.h>
29 #include <linux/kmod.h>
30 #include <linux/mtd/mtd.h>
31 #include <linux/mtd/partitions.h>
32 #include <linux/err.h>
37 /* Our partition linked list */
38 static LIST_HEAD(mtd_partitions);
39 static DEFINE_MUTEX(mtd_partitions_mutex);
42 * struct mtd_part - our partition node structure
44 * @mtd: struct holding partition details
45 * @parent: parent mtd - flash device or another partition
46 * @offset: partition offset relative to the *flash device*
50 struct mtd_info *parent;
52 struct list_head list;
56 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
57 * the pointer to that structure.
59 static inline struct mtd_part *mtd_to_part(const struct mtd_info *mtd)
61 return container_of(mtd, struct mtd_part, mtd);
66 * MTD methods which simply translate the effective address and pass through
67 * to the _real_ device.
70 static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
71 size_t *retlen, u_char *buf)
73 struct mtd_part *part = mtd_to_part(mtd);
74 struct mtd_ecc_stats stats;
77 stats = part->parent->ecc_stats;
78 res = part->parent->_read(part->parent, from + part->offset, len,
80 if (unlikely(mtd_is_eccerr(res)))
81 mtd->ecc_stats.failed +=
82 part->parent->ecc_stats.failed - stats.failed;
84 mtd->ecc_stats.corrected +=
85 part->parent->ecc_stats.corrected - stats.corrected;
89 static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
90 size_t *retlen, void **virt, resource_size_t *phys)
92 struct mtd_part *part = mtd_to_part(mtd);
94 return part->parent->_point(part->parent, from + part->offset, len,
98 static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
100 struct mtd_part *part = mtd_to_part(mtd);
102 return part->parent->_unpoint(part->parent, from + part->offset, len);
105 static int part_read_oob(struct mtd_info *mtd, loff_t from,
106 struct mtd_oob_ops *ops)
108 struct mtd_part *part = mtd_to_part(mtd);
109 struct mtd_ecc_stats stats;
112 stats = part->parent->ecc_stats;
113 res = part->parent->_read_oob(part->parent, from + part->offset, ops);
114 if (unlikely(mtd_is_eccerr(res)))
115 mtd->ecc_stats.failed +=
116 part->parent->ecc_stats.failed - stats.failed;
118 mtd->ecc_stats.corrected +=
119 part->parent->ecc_stats.corrected - stats.corrected;
123 static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
124 size_t len, size_t *retlen, u_char *buf)
126 struct mtd_part *part = mtd_to_part(mtd);
127 return part->parent->_read_user_prot_reg(part->parent, from, len,
131 static int part_get_user_prot_info(struct mtd_info *mtd, size_t len,
132 size_t *retlen, struct otp_info *buf)
134 struct mtd_part *part = mtd_to_part(mtd);
135 return part->parent->_get_user_prot_info(part->parent, len, retlen,
139 static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
140 size_t len, size_t *retlen, u_char *buf)
142 struct mtd_part *part = mtd_to_part(mtd);
143 return part->parent->_read_fact_prot_reg(part->parent, from, len,
147 static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len,
148 size_t *retlen, struct otp_info *buf)
150 struct mtd_part *part = mtd_to_part(mtd);
151 return part->parent->_get_fact_prot_info(part->parent, len, retlen,
155 static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
156 size_t *retlen, const u_char *buf)
158 struct mtd_part *part = mtd_to_part(mtd);
159 return part->parent->_write(part->parent, to + part->offset, len,
163 static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
164 size_t *retlen, const u_char *buf)
166 struct mtd_part *part = mtd_to_part(mtd);
167 return part->parent->_panic_write(part->parent, to + part->offset, len,
171 static int part_write_oob(struct mtd_info *mtd, loff_t to,
172 struct mtd_oob_ops *ops)
174 struct mtd_part *part = mtd_to_part(mtd);
176 return part->parent->_write_oob(part->parent, to + part->offset, ops);
179 static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
180 size_t len, size_t *retlen, u_char *buf)
182 struct mtd_part *part = mtd_to_part(mtd);
183 return part->parent->_write_user_prot_reg(part->parent, from, len,
187 static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
190 struct mtd_part *part = mtd_to_part(mtd);
191 return part->parent->_lock_user_prot_reg(part->parent, from, len);
194 static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
195 unsigned long count, loff_t to, size_t *retlen)
197 struct mtd_part *part = mtd_to_part(mtd);
198 return part->parent->_writev(part->parent, vecs, count,
199 to + part->offset, retlen);
202 static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
204 struct mtd_part *part = mtd_to_part(mtd);
207 instr->addr += part->offset;
208 ret = part->parent->_erase(part->parent, instr);
209 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
210 instr->fail_addr -= part->offset;
211 instr->addr -= part->offset;
216 static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
218 struct mtd_part *part = mtd_to_part(mtd);
219 return part->parent->_lock(part->parent, ofs + part->offset, len);
222 static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
224 struct mtd_part *part = mtd_to_part(mtd);
225 return part->parent->_unlock(part->parent, ofs + part->offset, len);
228 static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
230 struct mtd_part *part = mtd_to_part(mtd);
231 return part->parent->_is_locked(part->parent, ofs + part->offset, len);
234 static void part_sync(struct mtd_info *mtd)
236 struct mtd_part *part = mtd_to_part(mtd);
237 part->parent->_sync(part->parent);
240 static int part_suspend(struct mtd_info *mtd)
242 struct mtd_part *part = mtd_to_part(mtd);
243 return part->parent->_suspend(part->parent);
246 static void part_resume(struct mtd_info *mtd)
248 struct mtd_part *part = mtd_to_part(mtd);
249 part->parent->_resume(part->parent);
252 static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs)
254 struct mtd_part *part = mtd_to_part(mtd);
256 return part->parent->_block_isreserved(part->parent, ofs);
259 static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
261 struct mtd_part *part = mtd_to_part(mtd);
263 return part->parent->_block_isbad(part->parent, ofs);
266 static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
268 struct mtd_part *part = mtd_to_part(mtd);
272 res = part->parent->_block_markbad(part->parent, ofs);
274 mtd->ecc_stats.badblocks++;
278 static int part_get_device(struct mtd_info *mtd)
280 struct mtd_part *part = mtd_to_part(mtd);
281 return part->parent->_get_device(part->parent);
284 static void part_put_device(struct mtd_info *mtd)
286 struct mtd_part *part = mtd_to_part(mtd);
287 part->parent->_put_device(part->parent);
290 static int part_ooblayout_ecc(struct mtd_info *mtd, int section,
291 struct mtd_oob_region *oobregion)
293 struct mtd_part *part = mtd_to_part(mtd);
295 return mtd_ooblayout_ecc(part->parent, section, oobregion);
298 static int part_ooblayout_free(struct mtd_info *mtd, int section,
299 struct mtd_oob_region *oobregion)
301 struct mtd_part *part = mtd_to_part(mtd);
303 return mtd_ooblayout_free(part->parent, section, oobregion);
306 static const struct mtd_ooblayout_ops part_ooblayout_ops = {
307 .ecc = part_ooblayout_ecc,
308 .free = part_ooblayout_free,
311 static int part_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len)
313 struct mtd_part *part = mtd_to_part(mtd);
315 return part->parent->_max_bad_blocks(part->parent,
316 ofs + part->offset, len);
319 static inline void free_partition(struct mtd_part *p)
326 * mtd_parse_part - parse MTD partition looking for subpartitions
328 * @slave: part that is supposed to be a container and should be parsed
329 * @types: NULL-terminated array with names of partition parsers to try
331 * Some partitions are kind of containers with extra subpartitions (volumes).
332 * There can be various formats of such containers. This function tries to use
333 * specified parsers to analyze given partition and registers found
334 * subpartitions on success.
336 static int mtd_parse_part(struct mtd_part *slave, const char *const *types)
338 struct mtd_partitions parsed;
341 err = parse_mtd_partitions(&slave->mtd, types, &parsed, NULL);
344 else if (!parsed.nr_parts)
347 err = add_mtd_partitions(&slave->mtd, parsed.parts, parsed.nr_parts);
349 mtd_part_parser_cleanup(&parsed);
354 static struct mtd_part *allocate_partition(struct mtd_info *parent,
355 const struct mtd_partition *part, int partno,
358 int wr_alignment = (parent->flags & MTD_NO_ERASE) ? parent->writesize :
360 struct mtd_part *slave;
365 /* allocate the partition structure */
366 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
367 name = kstrdup(part->name, GFP_KERNEL);
368 if (!name || !slave) {
369 printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
373 return ERR_PTR(-ENOMEM);
376 /* set up the MTD object for this partition */
377 slave->mtd.type = parent->type;
378 slave->mtd.flags = parent->flags & ~part->mask_flags;
379 slave->mtd.size = part->size;
380 slave->mtd.writesize = parent->writesize;
381 slave->mtd.writebufsize = parent->writebufsize;
382 slave->mtd.oobsize = parent->oobsize;
383 slave->mtd.oobavail = parent->oobavail;
384 slave->mtd.subpage_sft = parent->subpage_sft;
385 slave->mtd.pairing = parent->pairing;
387 slave->mtd.name = name;
388 slave->mtd.owner = parent->owner;
390 /* NOTE: Historically, we didn't arrange MTDs as a tree out of
391 * concern for showing the same data in multiple partitions.
392 * However, it is very useful to have the master node present,
393 * so the MTD_PARTITIONED_MASTER option allows that. The master
394 * will have device nodes etc only if this is set, so make the
395 * parent conditional on that option. Note, this is a way to
396 * distinguish between the master and the partition in sysfs.
398 slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) || mtd_is_partition(parent) ?
401 slave->mtd.dev.of_node = part->of_node;
404 slave->mtd._read = part_read;
406 slave->mtd._write = part_write;
408 if (parent->_panic_write)
409 slave->mtd._panic_write = part_panic_write;
411 if (parent->_point && parent->_unpoint) {
412 slave->mtd._point = part_point;
413 slave->mtd._unpoint = part_unpoint;
416 if (parent->_read_oob)
417 slave->mtd._read_oob = part_read_oob;
418 if (parent->_write_oob)
419 slave->mtd._write_oob = part_write_oob;
420 if (parent->_read_user_prot_reg)
421 slave->mtd._read_user_prot_reg = part_read_user_prot_reg;
422 if (parent->_read_fact_prot_reg)
423 slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg;
424 if (parent->_write_user_prot_reg)
425 slave->mtd._write_user_prot_reg = part_write_user_prot_reg;
426 if (parent->_lock_user_prot_reg)
427 slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg;
428 if (parent->_get_user_prot_info)
429 slave->mtd._get_user_prot_info = part_get_user_prot_info;
430 if (parent->_get_fact_prot_info)
431 slave->mtd._get_fact_prot_info = part_get_fact_prot_info;
433 slave->mtd._sync = part_sync;
434 if (!partno && !parent->dev.class && parent->_suspend &&
436 slave->mtd._suspend = part_suspend;
437 slave->mtd._resume = part_resume;
440 slave->mtd._writev = part_writev;
442 slave->mtd._lock = part_lock;
444 slave->mtd._unlock = part_unlock;
445 if (parent->_is_locked)
446 slave->mtd._is_locked = part_is_locked;
447 if (parent->_block_isreserved)
448 slave->mtd._block_isreserved = part_block_isreserved;
449 if (parent->_block_isbad)
450 slave->mtd._block_isbad = part_block_isbad;
451 if (parent->_block_markbad)
452 slave->mtd._block_markbad = part_block_markbad;
453 if (parent->_max_bad_blocks)
454 slave->mtd._max_bad_blocks = part_max_bad_blocks;
456 if (parent->_get_device)
457 slave->mtd._get_device = part_get_device;
458 if (parent->_put_device)
459 slave->mtd._put_device = part_put_device;
461 slave->mtd._erase = part_erase;
462 slave->parent = parent;
463 slave->offset = part->offset;
465 if (slave->offset == MTDPART_OFS_APPEND)
466 slave->offset = cur_offset;
467 if (slave->offset == MTDPART_OFS_NXTBLK) {
469 slave->offset = cur_offset;
470 remainder = do_div(tmp, wr_alignment);
472 slave->offset += wr_alignment - remainder;
473 printk(KERN_NOTICE "Moving partition %d: "
474 "0x%012llx -> 0x%012llx\n", partno,
475 (unsigned long long)cur_offset, (unsigned long long)slave->offset);
478 if (slave->offset == MTDPART_OFS_RETAIN) {
479 slave->offset = cur_offset;
480 if (parent->size - slave->offset >= slave->mtd.size) {
481 slave->mtd.size = parent->size - slave->offset
484 printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
485 part->name, parent->size - slave->offset,
487 /* register to preserve ordering */
491 if (slave->mtd.size == MTDPART_SIZ_FULL)
492 slave->mtd.size = parent->size - slave->offset;
494 printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
495 (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
497 /* let's do some sanity checks */
498 if (slave->offset >= parent->size) {
499 /* let's register it anyway to preserve ordering */
502 printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
506 if (slave->offset + slave->mtd.size > parent->size) {
507 slave->mtd.size = parent->size - slave->offset;
508 printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
509 part->name, parent->name, (unsigned long long)slave->mtd.size);
511 if (parent->numeraseregions > 1) {
512 /* Deal with variable erase size stuff */
513 int i, max = parent->numeraseregions;
514 u64 end = slave->offset + slave->mtd.size;
515 struct mtd_erase_region_info *regions = parent->eraseregions;
517 /* Find the first erase regions which is part of this
519 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
521 /* The loop searched for the region _behind_ the first one */
525 /* Pick biggest erasesize */
526 for (; i < max && regions[i].offset < end; i++) {
527 if (slave->mtd.erasesize < regions[i].erasesize) {
528 slave->mtd.erasesize = regions[i].erasesize;
531 BUG_ON(slave->mtd.erasesize == 0);
533 /* Single erase size */
534 slave->mtd.erasesize = parent->erasesize;
538 * Slave erasesize might differ from the master one if the master
539 * exposes several regions with different erasesize. Adjust
540 * wr_alignment accordingly.
542 if (!(slave->mtd.flags & MTD_NO_ERASE))
543 wr_alignment = slave->mtd.erasesize;
546 remainder = do_div(tmp, wr_alignment);
547 if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
548 /* Doesn't start on a boundary of major erase size */
549 /* FIXME: Let it be writable if it is on a boundary of
550 * _minor_ erase size though */
551 slave->mtd.flags &= ~MTD_WRITEABLE;
552 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
556 tmp = slave->mtd.size;
557 remainder = do_div(tmp, wr_alignment);
558 if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
559 slave->mtd.flags &= ~MTD_WRITEABLE;
560 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
564 mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);
565 slave->mtd.ecc_step_size = parent->ecc_step_size;
566 slave->mtd.ecc_strength = parent->ecc_strength;
567 slave->mtd.bitflip_threshold = parent->bitflip_threshold;
569 if (parent->_block_isbad) {
572 while (offs < slave->mtd.size) {
573 if (mtd_block_isreserved(parent, offs + slave->offset))
574 slave->mtd.ecc_stats.bbtblocks++;
575 else if (mtd_block_isbad(parent, offs + slave->offset))
576 slave->mtd.ecc_stats.badblocks++;
577 offs += slave->mtd.erasesize;
585 static ssize_t mtd_partition_offset_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
588 struct mtd_info *mtd = dev_get_drvdata(dev);
589 struct mtd_part *part = mtd_to_part(mtd);
590 return snprintf(buf, PAGE_SIZE, "%lld\n", part->offset);
593 static DEVICE_ATTR(offset, S_IRUGO, mtd_partition_offset_show, NULL);
595 static const struct attribute *mtd_partition_attrs[] = {
596 &dev_attr_offset.attr,
600 static int mtd_add_partition_attrs(struct mtd_part *new)
602 int ret = sysfs_create_files(&new->mtd.dev.kobj, mtd_partition_attrs);
605 "mtd: failed to create partition attrs, err=%d\n", ret);
609 int mtd_add_partition(struct mtd_info *parent, const char *name,
610 long long offset, long long length)
612 struct mtd_partition part;
613 struct mtd_part *new;
616 /* the direct offset is expected */
617 if (offset == MTDPART_OFS_APPEND ||
618 offset == MTDPART_OFS_NXTBLK)
621 if (length == MTDPART_SIZ_FULL)
622 length = parent->size - offset;
627 memset(&part, 0, sizeof(part));
630 part.offset = offset;
632 new = allocate_partition(parent, &part, -1, offset);
636 mutex_lock(&mtd_partitions_mutex);
637 list_add(&new->list, &mtd_partitions);
638 mutex_unlock(&mtd_partitions_mutex);
640 add_mtd_device(&new->mtd);
642 mtd_add_partition_attrs(new);
646 EXPORT_SYMBOL_GPL(mtd_add_partition);
649 * __mtd_del_partition - delete MTD partition
651 * @priv: internal MTD struct for partition to be deleted
653 * This function must be called with the partitions mutex locked.
655 static int __mtd_del_partition(struct mtd_part *priv)
657 struct mtd_part *child, *next;
660 list_for_each_entry_safe(child, next, &mtd_partitions, list) {
661 if (child->parent == &priv->mtd) {
662 err = __mtd_del_partition(child);
668 sysfs_remove_files(&priv->mtd.dev.kobj, mtd_partition_attrs);
670 err = del_mtd_device(&priv->mtd);
674 list_del(&priv->list);
675 free_partition(priv);
681 * This function unregisters and destroy all slave MTD objects which are
682 * attached to the given MTD object.
684 int del_mtd_partitions(struct mtd_info *mtd)
686 struct mtd_part *slave, *next;
689 mutex_lock(&mtd_partitions_mutex);
690 list_for_each_entry_safe(slave, next, &mtd_partitions, list)
691 if (slave->parent == mtd) {
692 ret = __mtd_del_partition(slave);
696 mutex_unlock(&mtd_partitions_mutex);
701 int mtd_del_partition(struct mtd_info *mtd, int partno)
703 struct mtd_part *slave, *next;
706 mutex_lock(&mtd_partitions_mutex);
707 list_for_each_entry_safe(slave, next, &mtd_partitions, list)
708 if ((slave->parent == mtd) &&
709 (slave->mtd.index == partno)) {
710 ret = __mtd_del_partition(slave);
713 mutex_unlock(&mtd_partitions_mutex);
717 EXPORT_SYMBOL_GPL(mtd_del_partition);
720 * This function, given a master MTD object and a partition table, creates
721 * and registers slave MTD objects which are bound to the master according to
722 * the partition definitions.
724 * For historical reasons, this function's caller only registers the master
725 * if the MTD_PARTITIONED_MASTER config option is set.
728 int add_mtd_partitions(struct mtd_info *master,
729 const struct mtd_partition *parts,
732 struct mtd_part *slave;
733 uint64_t cur_offset = 0;
736 printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
738 for (i = 0; i < nbparts; i++) {
739 slave = allocate_partition(master, parts + i, i, cur_offset);
741 del_mtd_partitions(master);
742 return PTR_ERR(slave);
745 mutex_lock(&mtd_partitions_mutex);
746 list_add(&slave->list, &mtd_partitions);
747 mutex_unlock(&mtd_partitions_mutex);
749 add_mtd_device(&slave->mtd);
750 mtd_add_partition_attrs(slave);
752 mtd_parse_part(slave, parts[i].types);
754 cur_offset = slave->offset + slave->mtd.size;
760 static DEFINE_SPINLOCK(part_parser_lock);
761 static LIST_HEAD(part_parsers);
763 static struct mtd_part_parser *mtd_part_parser_get(const char *name)
765 struct mtd_part_parser *p, *ret = NULL;
767 spin_lock(&part_parser_lock);
769 list_for_each_entry(p, &part_parsers, list)
770 if (!strcmp(p->name, name) && try_module_get(p->owner)) {
775 spin_unlock(&part_parser_lock);
780 static inline void mtd_part_parser_put(const struct mtd_part_parser *p)
782 module_put(p->owner);
786 * Many partition parsers just expected the core to kfree() all their data in
787 * one chunk. Do that by default.
789 static void mtd_part_parser_cleanup_default(const struct mtd_partition *pparts,
795 int __register_mtd_parser(struct mtd_part_parser *p, struct module *owner)
800 p->cleanup = &mtd_part_parser_cleanup_default;
802 spin_lock(&part_parser_lock);
803 list_add(&p->list, &part_parsers);
804 spin_unlock(&part_parser_lock);
808 EXPORT_SYMBOL_GPL(__register_mtd_parser);
810 void deregister_mtd_parser(struct mtd_part_parser *p)
812 spin_lock(&part_parser_lock);
814 spin_unlock(&part_parser_lock);
816 EXPORT_SYMBOL_GPL(deregister_mtd_parser);
819 * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
820 * are changing this array!
822 static const char * const default_mtd_part_types[] = {
828 static int mtd_part_do_parse(struct mtd_part_parser *parser,
829 struct mtd_info *master,
830 struct mtd_partitions *pparts,
831 struct mtd_part_parser_data *data)
835 ret = (*parser->parse_fn)(master, &pparts->parts, data);
836 pr_debug("%s: parser %s: %i\n", master->name, parser->name, ret);
840 pr_notice("%d %s partitions found on MTD device %s\n", ret,
841 parser->name, master->name);
843 pparts->nr_parts = ret;
844 pparts->parser = parser;
850 * mtd_part_get_compatible_parser - find MTD parser by a compatible string
852 * @compat: compatible string describing partitions in a device tree
854 * MTD parsers can specify supported partitions by providing a table of
855 * compatibility strings. This function finds a parser that advertises support
856 * for a passed value of "compatible".
858 static struct mtd_part_parser *mtd_part_get_compatible_parser(const char *compat)
860 struct mtd_part_parser *p, *ret = NULL;
862 spin_lock(&part_parser_lock);
864 list_for_each_entry(p, &part_parsers, list) {
865 const struct of_device_id *matches;
867 matches = p->of_match_table;
871 for (; matches->compatible[0]; matches++) {
872 if (!strcmp(matches->compatible, compat) &&
873 try_module_get(p->owner)) {
883 spin_unlock(&part_parser_lock);
888 static int mtd_part_of_parse(struct mtd_info *master,
889 struct mtd_partitions *pparts)
891 struct mtd_part_parser *parser;
892 struct device_node *np;
893 struct property *prop;
895 const char *fixed = "fixed-partitions";
898 np = of_get_child_by_name(mtd_get_of_node(master), "partitions");
899 of_property_for_each_string(np, "compatible", prop, compat) {
900 parser = mtd_part_get_compatible_parser(compat);
903 ret = mtd_part_do_parse(parser, master, pparts, NULL);
908 mtd_part_parser_put(parser);
915 * For backward compatibility we have to try the "fixed-partitions"
916 * parser. It supports old DT format with partitions specified as a
917 * direct subnodes of a flash device DT node without any compatibility
918 * specified we could match.
920 parser = mtd_part_parser_get(fixed);
921 if (!parser && !request_module("%s", fixed))
922 parser = mtd_part_parser_get(fixed);
924 ret = mtd_part_do_parse(parser, master, pparts, NULL);
927 mtd_part_parser_put(parser);
936 * parse_mtd_partitions - parse MTD partitions
937 * @master: the master partition (describes whole MTD device)
938 * @types: names of partition parsers to try or %NULL
939 * @pparts: info about partitions found is returned here
940 * @data: MTD partition parser-specific data
942 * This function tries to find partition on MTD device @master. It uses MTD
943 * partition parsers, specified in @types. However, if @types is %NULL, then
944 * the default list of parsers is used. The default list contains only the
945 * "cmdlinepart" and "ofpart" parsers ATM.
946 * Note: If there are more then one parser in @types, the kernel only takes the
947 * partitions parsed out by the first parser.
949 * This function may return:
950 * o a negative error code in case of failure
951 * o zero otherwise, and @pparts will describe the partitions, number of
952 * partitions, and the parser which parsed them. Caller must release
953 * resources with mtd_part_parser_cleanup() when finished with the returned
956 int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
957 struct mtd_partitions *pparts,
958 struct mtd_part_parser_data *data)
960 struct mtd_part_parser *parser;
964 types = default_mtd_part_types;
966 for ( ; *types; types++) {
968 * ofpart is a special type that means OF partitioning info
969 * should be used. It requires a bit different logic so it is
970 * handled in a separated function.
972 if (!strcmp(*types, "ofpart")) {
973 ret = mtd_part_of_parse(master, pparts);
975 pr_debug("%s: parsing partitions %s\n", master->name,
977 parser = mtd_part_parser_get(*types);
978 if (!parser && !request_module("%s", *types))
979 parser = mtd_part_parser_get(*types);
980 pr_debug("%s: got parser %s\n", master->name,
981 parser ? parser->name : NULL);
984 ret = mtd_part_do_parse(parser, master, pparts, data);
986 mtd_part_parser_put(parser);
988 /* Found partitions! */
992 * Stash the first error we see; only report it if no parser
1001 void mtd_part_parser_cleanup(struct mtd_partitions *parts)
1003 const struct mtd_part_parser *parser;
1008 parser = parts->parser;
1010 if (parser->cleanup)
1011 parser->cleanup(parts->parts, parts->nr_parts);
1013 mtd_part_parser_put(parser);
1017 int mtd_is_partition(const struct mtd_info *mtd)
1019 struct mtd_part *part;
1022 mutex_lock(&mtd_partitions_mutex);
1023 list_for_each_entry(part, &mtd_partitions, list)
1024 if (&part->mtd == mtd) {
1028 mutex_unlock(&mtd_partitions_mutex);
1032 EXPORT_SYMBOL_GPL(mtd_is_partition);
1034 /* Returns the size of the entire flash chip */
1035 uint64_t mtd_get_device_size(const struct mtd_info *mtd)
1037 if (!mtd_is_partition(mtd))
1040 return mtd_get_device_size(mtd_to_part(mtd)->parent);
1042 EXPORT_SYMBOL_GPL(mtd_get_device_size);