]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/mtd/mtdpart.c
2 * Simple MTD partitioning layer
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
8 * $Id: mtdpart.c,v 1.55 2005/11/07 11:14:20 gleixner Exp $
10 * 02-21-2002 Thomas Gleixner <gleixner@autronix.de>
11 * added support for read_oob, write_oob
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/list.h>
19 #include <linux/config.h>
20 #include <linux/kmod.h>
21 #include <linux/mtd/mtd.h>
22 #include <linux/mtd/partitions.h>
23 #include <linux/mtd/compatmac.h>
25 /* Our partition linked list */
26 static LIST_HEAD(mtd_partitions
);
28 /* Our partition node structure */
31 struct mtd_info
*master
;
34 struct list_head list
;
39 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
40 * the pointer to that structure with this macro.
42 #define PART(x) ((struct mtd_part *)(x))
46 * MTD methods which simply translate the effective address and pass through
47 * to the _real_ device.
50 static int part_read (struct mtd_info
*mtd
, loff_t from
, size_t len
,
51 size_t *retlen
, u_char
*buf
)
53 struct mtd_part
*part
= PART(mtd
);
54 if (from
>= mtd
->size
)
56 else if (from
+ len
> mtd
->size
)
57 len
= mtd
->size
- from
;
58 return part
->master
->read (part
->master
, from
+ part
->offset
,
62 static int part_point (struct mtd_info
*mtd
, loff_t from
, size_t len
,
63 size_t *retlen
, u_char
**buf
)
65 struct mtd_part
*part
= PART(mtd
);
66 if (from
>= mtd
->size
)
68 else if (from
+ len
> mtd
->size
)
69 len
= mtd
->size
- from
;
70 return part
->master
->point (part
->master
, from
+ part
->offset
,
74 static void part_unpoint (struct mtd_info
*mtd
, u_char
*addr
, loff_t from
, size_t len
)
76 struct mtd_part
*part
= PART(mtd
);
78 part
->master
->unpoint (part
->master
, addr
, from
+ part
->offset
, len
);
81 static int part_read_oob (struct mtd_info
*mtd
, loff_t from
, size_t len
,
82 size_t *retlen
, u_char
*buf
)
84 struct mtd_part
*part
= PART(mtd
);
85 if (from
>= mtd
->size
)
87 else if (from
+ len
> mtd
->size
)
88 len
= mtd
->size
- from
;
89 return part
->master
->read_oob (part
->master
, from
+ part
->offset
,
93 static int part_read_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
94 size_t *retlen
, u_char
*buf
)
96 struct mtd_part
*part
= PART(mtd
);
97 return part
->master
->read_user_prot_reg (part
->master
, from
,
101 static int part_get_user_prot_info (struct mtd_info
*mtd
,
102 struct otp_info
*buf
, size_t len
)
104 struct mtd_part
*part
= PART(mtd
);
105 return part
->master
->get_user_prot_info (part
->master
, buf
, len
);
108 static int part_read_fact_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
109 size_t *retlen
, u_char
*buf
)
111 struct mtd_part
*part
= PART(mtd
);
112 return part
->master
->read_fact_prot_reg (part
->master
, from
,
116 static int part_get_fact_prot_info (struct mtd_info
*mtd
,
117 struct otp_info
*buf
, size_t len
)
119 struct mtd_part
*part
= PART(mtd
);
120 return part
->master
->get_fact_prot_info (part
->master
, buf
, len
);
123 static int part_write (struct mtd_info
*mtd
, loff_t to
, size_t len
,
124 size_t *retlen
, const u_char
*buf
)
126 struct mtd_part
*part
= PART(mtd
);
127 if (!(mtd
->flags
& MTD_WRITEABLE
))
131 else if (to
+ len
> mtd
->size
)
132 len
= mtd
->size
- to
;
133 return part
->master
->write (part
->master
, to
+ part
->offset
,
137 static int part_write_oob (struct mtd_info
*mtd
, loff_t to
, size_t len
,
138 size_t *retlen
, const u_char
*buf
)
140 struct mtd_part
*part
= PART(mtd
);
141 if (!(mtd
->flags
& MTD_WRITEABLE
))
145 else if (to
+ len
> mtd
->size
)
146 len
= mtd
->size
- to
;
147 return part
->master
->write_oob (part
->master
, to
+ part
->offset
,
151 static int part_write_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
152 size_t *retlen
, u_char
*buf
)
154 struct mtd_part
*part
= PART(mtd
);
155 return part
->master
->write_user_prot_reg (part
->master
, from
,
159 static int part_lock_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
)
161 struct mtd_part
*part
= PART(mtd
);
162 return part
->master
->lock_user_prot_reg (part
->master
, from
, len
);
165 static int part_writev (struct mtd_info
*mtd
, const struct kvec
*vecs
,
166 unsigned long count
, loff_t to
, size_t *retlen
)
168 struct mtd_part
*part
= PART(mtd
);
169 if (!(mtd
->flags
& MTD_WRITEABLE
))
171 return part
->master
->writev (part
->master
, vecs
, count
,
172 to
+ part
->offset
, retlen
);
175 static int part_erase (struct mtd_info
*mtd
, struct erase_info
*instr
)
177 struct mtd_part
*part
= PART(mtd
);
179 if (!(mtd
->flags
& MTD_WRITEABLE
))
181 if (instr
->addr
>= mtd
->size
)
183 instr
->addr
+= part
->offset
;
184 ret
= part
->master
->erase(part
->master
, instr
);
188 void mtd_erase_callback(struct erase_info
*instr
)
190 if (instr
->mtd
->erase
== part_erase
) {
191 struct mtd_part
*part
= PART(instr
->mtd
);
193 if (instr
->fail_addr
!= 0xffffffff)
194 instr
->fail_addr
-= part
->offset
;
195 instr
->addr
-= part
->offset
;
198 instr
->callback(instr
);
200 EXPORT_SYMBOL_GPL(mtd_erase_callback
);
202 static int part_lock (struct mtd_info
*mtd
, loff_t ofs
, size_t len
)
204 struct mtd_part
*part
= PART(mtd
);
205 if ((len
+ ofs
) > mtd
->size
)
207 return part
->master
->lock(part
->master
, ofs
+ part
->offset
, len
);
210 static int part_unlock (struct mtd_info
*mtd
, loff_t ofs
, size_t len
)
212 struct mtd_part
*part
= PART(mtd
);
213 if ((len
+ ofs
) > mtd
->size
)
215 return part
->master
->unlock(part
->master
, ofs
+ part
->offset
, len
);
218 static void part_sync(struct mtd_info
*mtd
)
220 struct mtd_part
*part
= PART(mtd
);
221 part
->master
->sync(part
->master
);
224 static int part_suspend(struct mtd_info
*mtd
)
226 struct mtd_part
*part
= PART(mtd
);
227 return part
->master
->suspend(part
->master
);
230 static void part_resume(struct mtd_info
*mtd
)
232 struct mtd_part
*part
= PART(mtd
);
233 part
->master
->resume(part
->master
);
236 static int part_block_isbad (struct mtd_info
*mtd
, loff_t ofs
)
238 struct mtd_part
*part
= PART(mtd
);
239 if (ofs
>= mtd
->size
)
242 return part
->master
->block_isbad(part
->master
, ofs
);
245 static int part_block_markbad (struct mtd_info
*mtd
, loff_t ofs
)
247 struct mtd_part
*part
= PART(mtd
);
248 if (!(mtd
->flags
& MTD_WRITEABLE
))
250 if (ofs
>= mtd
->size
)
253 return part
->master
->block_markbad(part
->master
, ofs
);
257 * This function unregisters and destroy all slave MTD objects which are
258 * attached to the given master MTD object.
261 int del_mtd_partitions(struct mtd_info
*master
)
263 struct list_head
*node
;
264 struct mtd_part
*slave
;
266 for (node
= mtd_partitions
.next
;
267 node
!= &mtd_partitions
;
269 slave
= list_entry(node
, struct mtd_part
, list
);
270 if (slave
->master
== master
) {
271 struct list_head
*prev
= node
->prev
;
272 __list_del(prev
, node
->next
);
273 if(slave
->registered
)
274 del_mtd_device(&slave
->mtd
);
284 * This function, given a master MTD object and a partition table, creates
285 * and registers slave MTD objects which are bound to the master according to
286 * the partition definitions.
287 * (Q: should we register the master MTD object as well?)
290 int add_mtd_partitions(struct mtd_info
*master
,
291 const struct mtd_partition
*parts
,
294 struct mtd_part
*slave
;
295 u_int32_t cur_offset
= 0;
298 printk (KERN_NOTICE
"Creating %d MTD partitions on \"%s\":\n", nbparts
, master
->name
);
300 for (i
= 0; i
< nbparts
; i
++) {
302 /* allocate the partition structure */
303 slave
= kmalloc (sizeof(*slave
), GFP_KERNEL
);
305 printk ("memory allocation error while creating partitions for \"%s\"\n",
307 del_mtd_partitions(master
);
310 memset(slave
, 0, sizeof(*slave
));
311 list_add(&slave
->list
, &mtd_partitions
);
313 /* set up the MTD object for this partition */
314 slave
->mtd
.type
= master
->type
;
315 slave
->mtd
.flags
= master
->flags
& ~parts
[i
].mask_flags
;
316 slave
->mtd
.size
= parts
[i
].size
;
317 slave
->mtd
.writesize
= master
->writesize
;
318 slave
->mtd
.oobsize
= master
->oobsize
;
319 slave
->mtd
.ecctype
= master
->ecctype
;
320 slave
->mtd
.eccsize
= master
->eccsize
;
322 slave
->mtd
.name
= parts
[i
].name
;
323 slave
->mtd
.bank_size
= master
->bank_size
;
324 slave
->mtd
.owner
= master
->owner
;
326 slave
->mtd
.read
= part_read
;
327 slave
->mtd
.write
= part_write
;
329 if(master
->point
&& master
->unpoint
){
330 slave
->mtd
.point
= part_point
;
331 slave
->mtd
.unpoint
= part_unpoint
;
334 if (master
->read_oob
)
335 slave
->mtd
.read_oob
= part_read_oob
;
336 if (master
->write_oob
)
337 slave
->mtd
.write_oob
= part_write_oob
;
338 if(master
->read_user_prot_reg
)
339 slave
->mtd
.read_user_prot_reg
= part_read_user_prot_reg
;
340 if(master
->read_fact_prot_reg
)
341 slave
->mtd
.read_fact_prot_reg
= part_read_fact_prot_reg
;
342 if(master
->write_user_prot_reg
)
343 slave
->mtd
.write_user_prot_reg
= part_write_user_prot_reg
;
344 if(master
->lock_user_prot_reg
)
345 slave
->mtd
.lock_user_prot_reg
= part_lock_user_prot_reg
;
346 if(master
->get_user_prot_info
)
347 slave
->mtd
.get_user_prot_info
= part_get_user_prot_info
;
348 if(master
->get_fact_prot_info
)
349 slave
->mtd
.get_fact_prot_info
= part_get_fact_prot_info
;
351 slave
->mtd
.sync
= part_sync
;
352 if (!i
&& master
->suspend
&& master
->resume
) {
353 slave
->mtd
.suspend
= part_suspend
;
354 slave
->mtd
.resume
= part_resume
;
357 slave
->mtd
.writev
= part_writev
;
359 slave
->mtd
.lock
= part_lock
;
361 slave
->mtd
.unlock
= part_unlock
;
362 if (master
->block_isbad
)
363 slave
->mtd
.block_isbad
= part_block_isbad
;
364 if (master
->block_markbad
)
365 slave
->mtd
.block_markbad
= part_block_markbad
;
366 slave
->mtd
.erase
= part_erase
;
367 slave
->master
= master
;
368 slave
->offset
= parts
[i
].offset
;
371 if (slave
->offset
== MTDPART_OFS_APPEND
)
372 slave
->offset
= cur_offset
;
373 if (slave
->offset
== MTDPART_OFS_NXTBLK
) {
374 slave
->offset
= cur_offset
;
375 if ((cur_offset
% master
->erasesize
) != 0) {
376 /* Round up to next erasesize */
377 slave
->offset
= ((cur_offset
/ master
->erasesize
) + 1) * master
->erasesize
;
378 printk(KERN_NOTICE
"Moving partition %d: "
379 "0x%08x -> 0x%08x\n", i
,
380 cur_offset
, slave
->offset
);
383 if (slave
->mtd
.size
== MTDPART_SIZ_FULL
)
384 slave
->mtd
.size
= master
->size
- slave
->offset
;
385 cur_offset
= slave
->offset
+ slave
->mtd
.size
;
387 printk (KERN_NOTICE
"0x%08x-0x%08x : \"%s\"\n", slave
->offset
,
388 slave
->offset
+ slave
->mtd
.size
, slave
->mtd
.name
);
390 /* let's do some sanity checks */
391 if (slave
->offset
>= master
->size
) {
392 /* let's register it anyway to preserve ordering */
395 printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
398 if (slave
->offset
+ slave
->mtd
.size
> master
->size
) {
399 slave
->mtd
.size
= master
->size
- slave
->offset
;
400 printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
401 parts
[i
].name
, master
->name
, slave
->mtd
.size
);
403 if (master
->numeraseregions
>1) {
404 /* Deal with variable erase size stuff */
406 struct mtd_erase_region_info
*regions
= master
->eraseregions
;
408 /* Find the first erase regions which is part of this partition. */
409 for (i
=0; i
< master
->numeraseregions
&& slave
->offset
>= regions
[i
].offset
; i
++)
412 for (i
--; i
< master
->numeraseregions
&& slave
->offset
+ slave
->mtd
.size
> regions
[i
].offset
; i
++) {
413 if (slave
->mtd
.erasesize
< regions
[i
].erasesize
) {
414 slave
->mtd
.erasesize
= regions
[i
].erasesize
;
418 /* Single erase size */
419 slave
->mtd
.erasesize
= master
->erasesize
;
422 if ((slave
->mtd
.flags
& MTD_WRITEABLE
) &&
423 (slave
->offset
% slave
->mtd
.erasesize
)) {
424 /* Doesn't start on a boundary of major erase size */
425 /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
426 slave
->mtd
.flags
&= ~MTD_WRITEABLE
;
427 printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
430 if ((slave
->mtd
.flags
& MTD_WRITEABLE
) &&
431 (slave
->mtd
.size
% slave
->mtd
.erasesize
)) {
432 slave
->mtd
.flags
&= ~MTD_WRITEABLE
;
433 printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
437 slave
->mtd
.ecclayout
= master
->ecclayout
;
440 { /* store the object pointer (caller may or may not register it */
441 *parts
[i
].mtdp
= &slave
->mtd
;
442 slave
->registered
= 0;
446 /* register our partition */
447 add_mtd_device(&slave
->mtd
);
448 slave
->registered
= 1;
455 EXPORT_SYMBOL(add_mtd_partitions
);
456 EXPORT_SYMBOL(del_mtd_partitions
);
458 static DEFINE_SPINLOCK(part_parser_lock
);
459 static LIST_HEAD(part_parsers
);
461 static struct mtd_part_parser
*get_partition_parser(const char *name
)
463 struct list_head
*this;
465 spin_lock(&part_parser_lock
);
467 list_for_each(this, &part_parsers
) {
468 struct mtd_part_parser
*p
= list_entry(this, struct mtd_part_parser
, list
);
470 if (!strcmp(p
->name
, name
) && try_module_get(p
->owner
)) {
475 spin_unlock(&part_parser_lock
);
480 int register_mtd_parser(struct mtd_part_parser
*p
)
482 spin_lock(&part_parser_lock
);
483 list_add(&p
->list
, &part_parsers
);
484 spin_unlock(&part_parser_lock
);
489 int deregister_mtd_parser(struct mtd_part_parser
*p
)
491 spin_lock(&part_parser_lock
);
493 spin_unlock(&part_parser_lock
);
497 int parse_mtd_partitions(struct mtd_info
*master
, const char **types
,
498 struct mtd_partition
**pparts
, unsigned long origin
)
500 struct mtd_part_parser
*parser
;
503 for ( ; ret
<= 0 && *types
; types
++) {
504 parser
= get_partition_parser(*types
);
506 if (!parser
&& !request_module("%s", *types
))
507 parser
= get_partition_parser(*types
);
510 printk(KERN_NOTICE
"%s partition parsing not available\n",
514 ret
= (*parser
->parse_fn
)(master
, pparts
, origin
);
516 printk(KERN_NOTICE
"%d %s partitions found on MTD device %s\n",
517 ret
, parser
->name
, master
->name
);
519 put_partition_parser(parser
);
524 EXPORT_SYMBOL_GPL(parse_mtd_partitions
);
525 EXPORT_SYMBOL_GPL(register_mtd_parser
);
526 EXPORT_SYMBOL_GPL(deregister_mtd_parser
);
528 MODULE_LICENSE("GPL");
529 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
530 MODULE_DESCRIPTION("Generic support for partitioning of MTD devices");