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
);
64 static u64
part_absolute_offset(struct mtd_info
*mtd
)
66 struct mtd_part
*part
= mtd_to_part(mtd
);
68 if (!mtd_is_partition(mtd
))
71 return part_absolute_offset(part
->parent
) + part
->offset
;
75 * MTD methods which simply translate the effective address and pass through
76 * to the _real_ device.
79 static int part_read(struct mtd_info
*mtd
, loff_t from
, size_t len
,
80 size_t *retlen
, u_char
*buf
)
82 struct mtd_part
*part
= mtd_to_part(mtd
);
83 struct mtd_ecc_stats stats
;
86 stats
= part
->parent
->ecc_stats
;
87 res
= part
->parent
->_read(part
->parent
, from
+ part
->offset
, len
,
89 if (unlikely(mtd_is_eccerr(res
)))
90 mtd
->ecc_stats
.failed
+=
91 part
->parent
->ecc_stats
.failed
- stats
.failed
;
93 mtd
->ecc_stats
.corrected
+=
94 part
->parent
->ecc_stats
.corrected
- stats
.corrected
;
98 static int part_point(struct mtd_info
*mtd
, loff_t from
, size_t len
,
99 size_t *retlen
, void **virt
, resource_size_t
*phys
)
101 struct mtd_part
*part
= mtd_to_part(mtd
);
103 return part
->parent
->_point(part
->parent
, from
+ part
->offset
, len
,
107 static int part_unpoint(struct mtd_info
*mtd
, loff_t from
, size_t len
)
109 struct mtd_part
*part
= mtd_to_part(mtd
);
111 return part
->parent
->_unpoint(part
->parent
, from
+ part
->offset
, len
);
114 static int part_read_oob(struct mtd_info
*mtd
, loff_t from
,
115 struct mtd_oob_ops
*ops
)
117 struct mtd_part
*part
= mtd_to_part(mtd
);
118 struct mtd_ecc_stats stats
;
121 stats
= part
->parent
->ecc_stats
;
122 res
= part
->parent
->_read_oob(part
->parent
, from
+ part
->offset
, ops
);
123 if (unlikely(mtd_is_eccerr(res
)))
124 mtd
->ecc_stats
.failed
+=
125 part
->parent
->ecc_stats
.failed
- stats
.failed
;
127 mtd
->ecc_stats
.corrected
+=
128 part
->parent
->ecc_stats
.corrected
- stats
.corrected
;
132 static int part_read_user_prot_reg(struct mtd_info
*mtd
, loff_t from
,
133 size_t len
, size_t *retlen
, u_char
*buf
)
135 struct mtd_part
*part
= mtd_to_part(mtd
);
136 return part
->parent
->_read_user_prot_reg(part
->parent
, from
, len
,
140 static int part_get_user_prot_info(struct mtd_info
*mtd
, size_t len
,
141 size_t *retlen
, struct otp_info
*buf
)
143 struct mtd_part
*part
= mtd_to_part(mtd
);
144 return part
->parent
->_get_user_prot_info(part
->parent
, len
, retlen
,
148 static int part_read_fact_prot_reg(struct mtd_info
*mtd
, loff_t from
,
149 size_t len
, size_t *retlen
, u_char
*buf
)
151 struct mtd_part
*part
= mtd_to_part(mtd
);
152 return part
->parent
->_read_fact_prot_reg(part
->parent
, from
, len
,
156 static int part_get_fact_prot_info(struct mtd_info
*mtd
, size_t len
,
157 size_t *retlen
, struct otp_info
*buf
)
159 struct mtd_part
*part
= mtd_to_part(mtd
);
160 return part
->parent
->_get_fact_prot_info(part
->parent
, len
, retlen
,
164 static int part_write(struct mtd_info
*mtd
, loff_t to
, size_t len
,
165 size_t *retlen
, const u_char
*buf
)
167 struct mtd_part
*part
= mtd_to_part(mtd
);
168 return part
->parent
->_write(part
->parent
, to
+ part
->offset
, len
,
172 static int part_panic_write(struct mtd_info
*mtd
, loff_t to
, size_t len
,
173 size_t *retlen
, const u_char
*buf
)
175 struct mtd_part
*part
= mtd_to_part(mtd
);
176 return part
->parent
->_panic_write(part
->parent
, to
+ part
->offset
, len
,
180 static int part_write_oob(struct mtd_info
*mtd
, loff_t to
,
181 struct mtd_oob_ops
*ops
)
183 struct mtd_part
*part
= mtd_to_part(mtd
);
185 return part
->parent
->_write_oob(part
->parent
, to
+ part
->offset
, ops
);
188 static int part_write_user_prot_reg(struct mtd_info
*mtd
, loff_t from
,
189 size_t len
, size_t *retlen
, u_char
*buf
)
191 struct mtd_part
*part
= mtd_to_part(mtd
);
192 return part
->parent
->_write_user_prot_reg(part
->parent
, from
, len
,
196 static int part_lock_user_prot_reg(struct mtd_info
*mtd
, loff_t from
,
199 struct mtd_part
*part
= mtd_to_part(mtd
);
200 return part
->parent
->_lock_user_prot_reg(part
->parent
, from
, len
);
203 static int part_writev(struct mtd_info
*mtd
, const struct kvec
*vecs
,
204 unsigned long count
, loff_t to
, size_t *retlen
)
206 struct mtd_part
*part
= mtd_to_part(mtd
);
207 return part
->parent
->_writev(part
->parent
, vecs
, count
,
208 to
+ part
->offset
, retlen
);
211 static int part_erase(struct mtd_info
*mtd
, struct erase_info
*instr
)
213 struct mtd_part
*part
= mtd_to_part(mtd
);
216 instr
->addr
+= part
->offset
;
217 ret
= part
->parent
->_erase(part
->parent
, instr
);
218 if (instr
->fail_addr
!= MTD_FAIL_ADDR_UNKNOWN
)
219 instr
->fail_addr
-= part
->offset
;
220 instr
->addr
-= part
->offset
;
225 static int part_lock(struct mtd_info
*mtd
, loff_t ofs
, uint64_t len
)
227 struct mtd_part
*part
= mtd_to_part(mtd
);
228 return part
->parent
->_lock(part
->parent
, ofs
+ part
->offset
, len
);
231 static int part_unlock(struct mtd_info
*mtd
, loff_t ofs
, uint64_t len
)
233 struct mtd_part
*part
= mtd_to_part(mtd
);
234 return part
->parent
->_unlock(part
->parent
, ofs
+ part
->offset
, len
);
237 static int part_is_locked(struct mtd_info
*mtd
, loff_t ofs
, uint64_t len
)
239 struct mtd_part
*part
= mtd_to_part(mtd
);
240 return part
->parent
->_is_locked(part
->parent
, ofs
+ part
->offset
, len
);
243 static void part_sync(struct mtd_info
*mtd
)
245 struct mtd_part
*part
= mtd_to_part(mtd
);
246 part
->parent
->_sync(part
->parent
);
249 static int part_suspend(struct mtd_info
*mtd
)
251 struct mtd_part
*part
= mtd_to_part(mtd
);
252 return part
->parent
->_suspend(part
->parent
);
255 static void part_resume(struct mtd_info
*mtd
)
257 struct mtd_part
*part
= mtd_to_part(mtd
);
258 part
->parent
->_resume(part
->parent
);
261 static int part_block_isreserved(struct mtd_info
*mtd
, loff_t ofs
)
263 struct mtd_part
*part
= mtd_to_part(mtd
);
265 return part
->parent
->_block_isreserved(part
->parent
, ofs
);
268 static int part_block_isbad(struct mtd_info
*mtd
, loff_t ofs
)
270 struct mtd_part
*part
= mtd_to_part(mtd
);
272 return part
->parent
->_block_isbad(part
->parent
, ofs
);
275 static int part_block_markbad(struct mtd_info
*mtd
, loff_t ofs
)
277 struct mtd_part
*part
= mtd_to_part(mtd
);
281 res
= part
->parent
->_block_markbad(part
->parent
, ofs
);
283 mtd
->ecc_stats
.badblocks
++;
287 static int part_get_device(struct mtd_info
*mtd
)
289 struct mtd_part
*part
= mtd_to_part(mtd
);
290 return part
->parent
->_get_device(part
->parent
);
293 static void part_put_device(struct mtd_info
*mtd
)
295 struct mtd_part
*part
= mtd_to_part(mtd
);
296 part
->parent
->_put_device(part
->parent
);
299 static int part_ooblayout_ecc(struct mtd_info
*mtd
, int section
,
300 struct mtd_oob_region
*oobregion
)
302 struct mtd_part
*part
= mtd_to_part(mtd
);
304 return mtd_ooblayout_ecc(part
->parent
, section
, oobregion
);
307 static int part_ooblayout_free(struct mtd_info
*mtd
, int section
,
308 struct mtd_oob_region
*oobregion
)
310 struct mtd_part
*part
= mtd_to_part(mtd
);
312 return mtd_ooblayout_free(part
->parent
, section
, oobregion
);
315 static const struct mtd_ooblayout_ops part_ooblayout_ops
= {
316 .ecc
= part_ooblayout_ecc
,
317 .free
= part_ooblayout_free
,
320 static int part_max_bad_blocks(struct mtd_info
*mtd
, loff_t ofs
, size_t len
)
322 struct mtd_part
*part
= mtd_to_part(mtd
);
324 return part
->parent
->_max_bad_blocks(part
->parent
,
325 ofs
+ part
->offset
, len
);
328 static inline void free_partition(struct mtd_part
*p
)
334 static struct mtd_part
*allocate_partition(struct mtd_info
*parent
,
335 const struct mtd_partition
*part
, int partno
,
338 int wr_alignment
= (parent
->flags
& MTD_NO_ERASE
) ? parent
->writesize
:
340 struct mtd_part
*slave
;
345 /* allocate the partition structure */
346 slave
= kzalloc(sizeof(*slave
), GFP_KERNEL
);
347 name
= kstrdup(part
->name
, GFP_KERNEL
);
348 if (!name
|| !slave
) {
349 printk(KERN_ERR
"memory allocation error while creating partitions for \"%s
\"\n",
353 return ERR_PTR(-ENOMEM);
356 /* set up the MTD object for this partition */
357 slave->mtd.type = parent->type;
358 slave->mtd.flags = parent->orig_flags & ~part->mask_flags;
359 slave->mtd.orig_flags = slave->mtd.flags;
360 slave->mtd.size = part->size;
361 slave->mtd.writesize = parent->writesize;
362 slave->mtd.writebufsize = parent->writebufsize;
363 slave->mtd.oobsize = parent->oobsize;
364 slave->mtd.oobavail = parent->oobavail;
365 slave->mtd.subpage_sft = parent->subpage_sft;
366 slave->mtd.pairing = parent->pairing;
368 slave->mtd.name = name;
369 slave->mtd.owner = parent->owner;
371 /* NOTE: Historically, we didn't arrange MTDs as a tree out of
372 * concern for showing the same data in multiple partitions.
373 * However, it is very useful to have the master node present,
374 * so the MTD_PARTITIONED_MASTER option allows that. The master
375 * will have device nodes etc only if this is set, so make the
376 * parent conditional on that option. Note, this is a way to
377 * distinguish between the master and the partition in sysfs.
379 slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) || mtd_is_partition(parent) ?
382 slave->mtd.dev.of_node = part->of_node;
385 slave->mtd._read = part_read;
387 slave->mtd._write = part_write;
389 if (parent->_panic_write)
390 slave->mtd._panic_write = part_panic_write;
392 if (parent->_point && parent->_unpoint) {
393 slave->mtd._point = part_point;
394 slave->mtd._unpoint = part_unpoint;
397 if (parent->_read_oob)
398 slave->mtd._read_oob = part_read_oob;
399 if (parent->_write_oob)
400 slave->mtd._write_oob = part_write_oob;
401 if (parent->_read_user_prot_reg)
402 slave->mtd._read_user_prot_reg = part_read_user_prot_reg;
403 if (parent->_read_fact_prot_reg)
404 slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg;
405 if (parent->_write_user_prot_reg)
406 slave->mtd._write_user_prot_reg = part_write_user_prot_reg;
407 if (parent->_lock_user_prot_reg)
408 slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg;
409 if (parent->_get_user_prot_info)
410 slave->mtd._get_user_prot_info = part_get_user_prot_info;
411 if (parent->_get_fact_prot_info)
412 slave->mtd._get_fact_prot_info = part_get_fact_prot_info;
414 slave->mtd._sync = part_sync;
415 if (!partno && !parent->dev.class && parent->_suspend &&
417 slave->mtd._suspend = part_suspend;
418 slave->mtd._resume = part_resume;
421 slave->mtd._writev = part_writev;
423 slave->mtd._lock = part_lock;
425 slave->mtd._unlock = part_unlock;
426 if (parent->_is_locked)
427 slave->mtd._is_locked = part_is_locked;
428 if (parent->_block_isreserved)
429 slave->mtd._block_isreserved = part_block_isreserved;
430 if (parent->_block_isbad)
431 slave->mtd._block_isbad = part_block_isbad;
432 if (parent->_block_markbad)
433 slave->mtd._block_markbad = part_block_markbad;
434 if (parent->_max_bad_blocks)
435 slave->mtd._max_bad_blocks = part_max_bad_blocks;
437 if (parent->_get_device)
438 slave->mtd._get_device = part_get_device;
439 if (parent->_put_device)
440 slave->mtd._put_device = part_put_device;
442 slave->mtd._erase = part_erase;
443 slave->parent = parent;
444 slave->offset = part->offset;
446 if (slave->offset == MTDPART_OFS_APPEND)
447 slave->offset = cur_offset;
448 if (slave->offset == MTDPART_OFS_NXTBLK) {
450 slave->offset = cur_offset;
451 remainder = do_div(tmp, wr_alignment);
453 slave->offset += wr_alignment - remainder;
454 printk(KERN_NOTICE "Moving partition
%d
: "
455 "0x
%012llx
-> 0x
%012llx
\n", partno,
456 (unsigned long long)cur_offset, (unsigned long long)slave->offset);
459 if (slave->offset == MTDPART_OFS_RETAIN) {
460 slave->offset = cur_offset;
461 if (parent->size - slave->offset >= slave->mtd.size) {
462 slave->mtd.size = parent->size - slave->offset
465 printk(KERN_ERR "mtd partition
\"%s
\" doesn
't have enough space: %#llx < %#llx, disabled\n",
466 part->name, parent->size - slave->offset,
468 /* register to preserve ordering */
472 if (slave->mtd.size == MTDPART_SIZ_FULL)
473 slave->mtd.size = parent->size - slave->offset;
475 printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
476 (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
478 /* let's
do some sanity checks */
479 if (slave
->offset
>= parent
->size
) {
480 /* let's register it anyway to preserve ordering */
483 printk(KERN_ERR
"mtd: partition \"%s
\" is out of reach
-- disabled
\n",
487 if (slave->offset + slave->mtd.size > parent->size) {
488 slave->mtd.size = parent->size - slave->offset;
489 printk(KERN_WARNING"mtd
: partition
\"%s
\" extends beyond the end of device
\"%s
\" -- size truncated to
%#llx\n",
490 part->name, parent->name, (unsigned long long)slave->mtd.size);
492 if (parent->numeraseregions > 1) {
493 /* Deal with variable erase size stuff */
494 int i, max = parent->numeraseregions;
495 u64 end = slave->offset + slave->mtd.size;
496 struct mtd_erase_region_info *regions = parent->eraseregions;
498 /* Find the first erase regions which is part of this
500 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
502 /* The loop searched for the region _behind_ the first one */
506 /* Pick biggest erasesize */
507 for (; i < max && regions[i].offset < end; i++) {
508 if (slave->mtd.erasesize < regions[i].erasesize) {
509 slave->mtd.erasesize = regions[i].erasesize;
512 BUG_ON(slave->mtd.erasesize == 0);
514 /* Single erase size */
515 slave->mtd.erasesize = parent->erasesize;
519 * Slave erasesize might differ from the master one if the master
520 * exposes several regions with different erasesize. Adjust
521 * wr_alignment accordingly.
523 if (!(slave->mtd.flags & MTD_NO_ERASE))
524 wr_alignment = slave->mtd.erasesize;
526 tmp = part_absolute_offset(parent) + slave->offset;
527 remainder = do_div(tmp, wr_alignment);
528 if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
529 /* Doesn't start on a boundary of major erase size */
530 /* FIXME: Let it be writable if it is on a boundary of
531 * _minor_ erase size though */
532 slave->mtd.flags &= ~MTD_WRITEABLE;
533 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
537 tmp = part_absolute_offset(parent) + slave->mtd.size;
538 remainder = do_div(tmp, wr_alignment);
539 if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
540 slave->mtd.flags &= ~MTD_WRITEABLE;
541 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
545 mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);
546 slave->mtd.ecc_step_size = parent->ecc_step_size;
547 slave->mtd.ecc_strength = parent->ecc_strength;
548 slave->mtd.bitflip_threshold = parent->bitflip_threshold;
550 if (parent->_block_isbad) {
553 while (offs < slave->mtd.size) {
554 if (mtd_block_isreserved(parent, offs + slave->offset))
555 slave->mtd.ecc_stats.bbtblocks++;
556 else if (mtd_block_isbad(parent, offs + slave->offset))
557 slave->mtd.ecc_stats.badblocks++;
558 offs += slave->mtd.erasesize;
566 static ssize_t mtd_partition_offset_show(struct device *dev,
567 struct device_attribute *attr, char *buf)
569 struct mtd_info *mtd = dev_get_drvdata(dev);
570 struct mtd_part *part = mtd_to_part(mtd);
571 return snprintf(buf, PAGE_SIZE, "%lld\n", part->offset);
574 static DEVICE_ATTR(offset, S_IRUGO, mtd_partition_offset_show, NULL);
576 static const struct attribute *mtd_partition_attrs[] = {
577 &dev_attr_offset.attr,
581 static int mtd_add_partition_attrs(struct mtd_part *new)
583 int ret = sysfs_create_files(&new->mtd.dev.kobj, mtd_partition_attrs);
586 "mtd: failed to create partition attrs, err=%d\n", ret);
590 int mtd_add_partition(struct mtd_info *parent, const char *name,
591 long long offset, long long length)
593 struct mtd_partition part;
594 struct mtd_part *new;
597 /* the direct offset is expected */
598 if (offset == MTDPART_OFS_APPEND ||
599 offset == MTDPART_OFS_NXTBLK)
602 if (length == MTDPART_SIZ_FULL)
603 length = parent->size - offset;
608 memset(&part, 0, sizeof(part));
611 part.offset = offset;
613 new = allocate_partition(parent, &part, -1, offset);
617 mutex_lock(&mtd_partitions_mutex);
618 list_add(&new->list, &mtd_partitions);
619 mutex_unlock(&mtd_partitions_mutex);
621 add_mtd_device(&new->mtd);
623 mtd_add_partition_attrs(new);
627 EXPORT_SYMBOL_GPL(mtd_add_partition);
630 * __mtd_del_partition - delete MTD partition
632 * @priv: internal MTD struct for partition to be deleted
634 * This function must be called with the partitions mutex locked.
636 static int __mtd_del_partition(struct mtd_part *priv)
638 struct mtd_part *child, *next;
641 list_for_each_entry_safe(child, next, &mtd_partitions, list) {
642 if (child->parent == &priv->mtd) {
643 err = __mtd_del_partition(child);
649 sysfs_remove_files(&priv->mtd.dev.kobj, mtd_partition_attrs);
651 err = del_mtd_device(&priv->mtd);
655 list_del(&priv->list);
656 free_partition(priv);
662 * This function unregisters and destroy all slave MTD objects which are
663 * attached to the given MTD object.
665 int del_mtd_partitions(struct mtd_info *mtd)
667 struct mtd_part *slave, *next;
670 mutex_lock(&mtd_partitions_mutex);
671 list_for_each_entry_safe(slave, next, &mtd_partitions, list)
672 if (slave->parent == mtd) {
673 ret = __mtd_del_partition(slave);
677 mutex_unlock(&mtd_partitions_mutex);
682 int mtd_del_partition(struct mtd_info *mtd, int partno)
684 struct mtd_part *slave, *next;
687 mutex_lock(&mtd_partitions_mutex);
688 list_for_each_entry_safe(slave, next, &mtd_partitions, list)
689 if ((slave->parent == mtd) &&
690 (slave->mtd.index == partno)) {
691 ret = __mtd_del_partition(slave);
694 mutex_unlock(&mtd_partitions_mutex);
698 EXPORT_SYMBOL_GPL(mtd_del_partition);
701 * This function, given a master MTD object and a partition table, creates
702 * and registers slave MTD objects which are bound to the master according to
703 * the partition definitions.
705 * For historical reasons, this function's caller only registers the master
706 * if the MTD_PARTITIONED_MASTER config option is set.
709 int add_mtd_partitions(struct mtd_info *master,
710 const struct mtd_partition *parts,
713 struct mtd_part *slave;
714 uint64_t cur_offset = 0;
717 printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
719 for (i = 0; i < nbparts; i++) {
720 slave = allocate_partition(master, parts + i, i, cur_offset);
722 del_mtd_partitions(master);
723 return PTR_ERR(slave);
726 mutex_lock(&mtd_partitions_mutex);
727 list_add(&slave->list, &mtd_partitions);
728 mutex_unlock(&mtd_partitions_mutex);
730 add_mtd_device(&slave->mtd);
731 mtd_add_partition_attrs(slave);
732 /* Look for subpartitions */
733 parse_mtd_partitions(&slave->mtd, parts[i].types, NULL);
735 cur_offset = slave->offset + slave->mtd.size;
741 static DEFINE_SPINLOCK(part_parser_lock);
742 static LIST_HEAD(part_parsers);
744 static struct mtd_part_parser *mtd_part_parser_get(const char *name)
746 struct mtd_part_parser *p, *ret = NULL;
748 spin_lock(&part_parser_lock);
750 list_for_each_entry(p, &part_parsers, list)
751 if (!strcmp(p->name, name) && try_module_get(p->owner)) {
756 spin_unlock(&part_parser_lock);
761 static inline void mtd_part_parser_put(const struct mtd_part_parser *p)
763 module_put(p->owner);
767 * Many partition parsers just expected the core to kfree() all their data in
768 * one chunk. Do that by default.
770 static void mtd_part_parser_cleanup_default(const struct mtd_partition *pparts,
776 int __register_mtd_parser(struct mtd_part_parser *p, struct module *owner)
781 p->cleanup = &mtd_part_parser_cleanup_default;
783 spin_lock(&part_parser_lock);
784 list_add(&p->list, &part_parsers);
785 spin_unlock(&part_parser_lock);
789 EXPORT_SYMBOL_GPL(__register_mtd_parser);
791 void deregister_mtd_parser(struct mtd_part_parser *p)
793 spin_lock(&part_parser_lock);
795 spin_unlock(&part_parser_lock);
797 EXPORT_SYMBOL_GPL(deregister_mtd_parser);
800 * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
801 * are changing this array!
803 static const char * const default_mtd_part_types[] = {
809 /* Check DT only when looking for subpartitions. */
810 static const char * const default_subpartition_types[] = {
815 static int mtd_part_do_parse(struct mtd_part_parser *parser,
816 struct mtd_info *master,
817 struct mtd_partitions *pparts,
818 struct mtd_part_parser_data *data)
822 ret = (*parser->parse_fn)(master, &pparts->parts, data);
823 pr_debug("%s: parser %s: %i\n", master->name, parser->name, ret);
827 pr_notice("%d %s partitions found on MTD device %s\n", ret,
828 parser->name, master->name);
830 pparts->nr_parts = ret;
831 pparts->parser = parser;
837 * mtd_part_get_compatible_parser - find MTD parser by a compatible string
839 * @compat: compatible string describing partitions in a device tree
841 * MTD parsers can specify supported partitions by providing a table of
842 * compatibility strings. This function finds a parser that advertises support
843 * for a passed value of "compatible".
845 static struct mtd_part_parser *mtd_part_get_compatible_parser(const char *compat)
847 struct mtd_part_parser *p, *ret = NULL;
849 spin_lock(&part_parser_lock);
851 list_for_each_entry(p, &part_parsers, list) {
852 const struct of_device_id *matches;
854 matches = p->of_match_table;
858 for (; matches->compatible[0]; matches++) {
859 if (!strcmp(matches->compatible, compat) &&
860 try_module_get(p->owner)) {
870 spin_unlock(&part_parser_lock);
875 static int mtd_part_of_parse(struct mtd_info *master,
876 struct mtd_partitions *pparts)
878 struct mtd_part_parser *parser;
879 struct device_node *np;
880 struct property *prop;
882 const char *fixed = "fixed-partitions";
885 np = mtd_get_of_node(master);
886 if (mtd_is_partition(master))
889 np = of_get_child_by_name(np, "partitions");
891 of_property_for_each_string(np, "compatible", prop, compat) {
892 parser = mtd_part_get_compatible_parser(compat);
895 ret = mtd_part_do_parse(parser, master, pparts, NULL);
900 mtd_part_parser_put(parser);
907 * For backward compatibility we have to try the "fixed-partitions"
908 * parser. It supports old DT format with partitions specified as a
909 * direct subnodes of a flash device DT node without any compatibility
910 * specified we could match.
912 parser = mtd_part_parser_get(fixed);
913 if (!parser && !request_module("%s", fixed))
914 parser = mtd_part_parser_get(fixed);
916 ret = mtd_part_do_parse(parser, master, pparts, NULL);
919 mtd_part_parser_put(parser);
928 * parse_mtd_partitions - parse and register MTD partitions
930 * @master: the master partition (describes whole MTD device)
931 * @types: names of partition parsers to try or %NULL
932 * @data: MTD partition parser-specific data
934 * This function tries to find & register partitions on MTD device @master. It
935 * uses MTD partition parsers, specified in @types. However, if @types is %NULL,
936 * then the default list of parsers is used. The default list contains only the
937 * "cmdlinepart" and "ofpart" parsers ATM.
938 * Note: If there are more then one parser in @types, the kernel only takes the
939 * partitions parsed out by the first parser.
941 * This function may return:
942 * o a negative error code in case of failure
943 * o number of found partitions otherwise
945 int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
946 struct mtd_part_parser_data *data)
948 struct mtd_partitions pparts = { };
949 struct mtd_part_parser *parser;
953 types = mtd_is_partition(master) ? default_subpartition_types :
954 default_mtd_part_types;
956 for ( ; *types; types++) {
958 * ofpart is a special type that means OF partitioning info
959 * should be used. It requires a bit different logic so it is
960 * handled in a separated function.
962 if (!strcmp(*types, "ofpart")) {
963 ret = mtd_part_of_parse(master, &pparts);
965 pr_debug("%s: parsing partitions %s\n", master->name,
967 parser = mtd_part_parser_get(*types);
968 if (!parser && !request_module("%s", *types))
969 parser = mtd_part_parser_get(*types);
970 pr_debug("%s: got parser %s\n", master->name,
971 parser ? parser->name : NULL);
974 ret = mtd_part_do_parse(parser, master, &pparts, data);
976 mtd_part_parser_put(parser);
978 /* Found partitions! */
980 err = add_mtd_partitions(master, pparts.parts,
982 mtd_part_parser_cleanup(&pparts);
983 return err ? err : pparts.nr_parts;
986 * Stash the first error we see; only report it if no parser
995 void mtd_part_parser_cleanup(struct mtd_partitions *parts)
997 const struct mtd_part_parser *parser;
1002 parser = parts->parser;
1004 if (parser->cleanup)
1005 parser->cleanup(parts->parts, parts->nr_parts);
1007 mtd_part_parser_put(parser);
1011 int mtd_is_partition(const struct mtd_info *mtd)
1013 struct mtd_part *part;
1016 mutex_lock(&mtd_partitions_mutex);
1017 list_for_each_entry(part, &mtd_partitions, list)
1018 if (&part->mtd == mtd) {
1022 mutex_unlock(&mtd_partitions_mutex);
1026 EXPORT_SYMBOL_GPL(mtd_is_partition);
1028 /* Returns the size of the entire flash chip */
1029 uint64_t mtd_get_device_size(const struct mtd_info *mtd)
1031 if (!mtd_is_partition(mtd))
1034 return mtd_get_device_size(mtd_to_part(mtd)->parent);
1036 EXPORT_SYMBOL_GPL(mtd_get_device_size);