2 * Simple MTD partitioning layer
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
8 * 02-21-2002 Thomas Gleixner <gleixner@autronix.de>
9 * added support for read_oob, write_oob
14 #include <asm/errno.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/partitions.h>
20 #include <linux/mtd/compat.h>
22 /* Our partition linked list */
23 struct list_head mtd_partitions
;
25 /* Our partition node structure */
28 struct mtd_info
*master
;
31 struct list_head list
;
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.
39 #define PART(x) ((struct mtd_part *)(x))
43 * MTD methods which simply translate the effective address and pass through
44 * to the _real_ device.
47 static int part_read(struct mtd_info
*mtd
, loff_t from
, size_t len
,
48 size_t *retlen
, u_char
*buf
)
50 struct mtd_part
*part
= PART(mtd
);
51 struct mtd_ecc_stats stats
;
54 stats
= part
->master
->ecc_stats
;
56 if (from
>= mtd
->size
)
58 else if (from
+ len
> mtd
->size
)
59 len
= mtd
->size
- from
;
60 res
= part
->master
->read(part
->master
, from
+ part
->offset
,
64 mtd
->ecc_stats
.corrected
+= part
->master
->ecc_stats
.corrected
- stats
.corrected
;
66 mtd
->ecc_stats
.failed
+= part
->master
->ecc_stats
.failed
- stats
.failed
;
71 static int part_read_oob(struct mtd_info
*mtd
, loff_t from
,
72 struct mtd_oob_ops
*ops
)
74 struct mtd_part
*part
= PART(mtd
);
77 if (from
>= mtd
->size
)
79 if (ops
->datbuf
&& from
+ ops
->len
> mtd
->size
)
81 res
= part
->master
->read_oob(part
->master
, from
+ part
->offset
, ops
);
85 mtd
->ecc_stats
.corrected
++;
87 mtd
->ecc_stats
.failed
++;
92 static int part_read_user_prot_reg(struct mtd_info
*mtd
, loff_t from
,
93 size_t len
, size_t *retlen
, u_char
*buf
)
95 struct mtd_part
*part
= PART(mtd
);
96 return part
->master
->read_user_prot_reg(part
->master
, from
,
100 static int part_get_user_prot_info(struct mtd_info
*mtd
,
101 struct otp_info
*buf
, size_t len
)
103 struct mtd_part
*part
= PART(mtd
);
104 return part
->master
->get_user_prot_info(part
->master
, buf
, len
);
107 static int part_read_fact_prot_reg(struct mtd_info
*mtd
, loff_t from
,
108 size_t len
, size_t *retlen
, u_char
*buf
)
110 struct mtd_part
*part
= PART(mtd
);
111 return part
->master
->read_fact_prot_reg(part
->master
, from
,
115 static int part_get_fact_prot_info(struct mtd_info
*mtd
, struct otp_info
*buf
,
118 struct mtd_part
*part
= PART(mtd
);
119 return part
->master
->get_fact_prot_info(part
->master
, buf
, len
);
122 static int part_write(struct mtd_info
*mtd
, loff_t to
, size_t len
,
123 size_t *retlen
, const u_char
*buf
)
125 struct mtd_part
*part
= PART(mtd
);
126 if (!(mtd
->flags
& MTD_WRITEABLE
))
130 else if (to
+ len
> mtd
->size
)
131 len
= mtd
->size
- to
;
132 return part
->master
->write(part
->master
, to
+ part
->offset
,
136 static int part_panic_write(struct mtd_info
*mtd
, loff_t to
, size_t len
,
137 size_t *retlen
, const u_char
*buf
)
139 struct mtd_part
*part
= PART(mtd
);
140 if (!(mtd
->flags
& MTD_WRITEABLE
))
144 else if (to
+ len
> mtd
->size
)
145 len
= mtd
->size
- to
;
146 return part
->master
->panic_write(part
->master
, to
+ part
->offset
,
150 static int part_write_oob(struct mtd_info
*mtd
, loff_t to
,
151 struct mtd_oob_ops
*ops
)
153 struct mtd_part
*part
= PART(mtd
);
155 if (!(mtd
->flags
& MTD_WRITEABLE
))
160 if (ops
->datbuf
&& to
+ ops
->len
> mtd
->size
)
162 return part
->master
->write_oob(part
->master
, to
+ part
->offset
, ops
);
165 static int part_write_user_prot_reg(struct mtd_info
*mtd
, loff_t from
,
166 size_t len
, size_t *retlen
, u_char
*buf
)
168 struct mtd_part
*part
= PART(mtd
);
169 return part
->master
->write_user_prot_reg(part
->master
, from
,
173 static int part_lock_user_prot_reg(struct mtd_info
*mtd
, loff_t from
,
176 struct mtd_part
*part
= PART(mtd
);
177 return part
->master
->lock_user_prot_reg(part
->master
, from
, len
);
180 static int part_erase(struct mtd_info
*mtd
, struct erase_info
*instr
)
182 struct mtd_part
*part
= PART(mtd
);
184 if (!(mtd
->flags
& MTD_WRITEABLE
))
186 if (instr
->addr
>= mtd
->size
)
188 instr
->addr
+= part
->offset
;
189 ret
= part
->master
->erase(part
->master
, instr
);
191 if (instr
->fail_addr
!= MTD_FAIL_ADDR_UNKNOWN
)
192 instr
->fail_addr
-= part
->offset
;
193 instr
->addr
-= part
->offset
;
198 void mtd_erase_callback(struct erase_info
*instr
)
200 if (instr
->mtd
->erase
== part_erase
) {
201 struct mtd_part
*part
= PART(instr
->mtd
);
203 if (instr
->fail_addr
!= MTD_FAIL_ADDR_UNKNOWN
)
204 instr
->fail_addr
-= part
->offset
;
205 instr
->addr
-= part
->offset
;
208 instr
->callback(instr
);
211 static int part_lock(struct mtd_info
*mtd
, loff_t ofs
, uint64_t len
)
213 struct mtd_part
*part
= PART(mtd
);
214 if ((len
+ ofs
) > mtd
->size
)
216 return part
->master
->lock(part
->master
, ofs
+ part
->offset
, len
);
219 static int part_unlock(struct mtd_info
*mtd
, loff_t ofs
, uint64_t len
)
221 struct mtd_part
*part
= PART(mtd
);
222 if ((len
+ ofs
) > mtd
->size
)
224 return part
->master
->unlock(part
->master
, ofs
+ part
->offset
, len
);
227 static void part_sync(struct mtd_info
*mtd
)
229 struct mtd_part
*part
= PART(mtd
);
230 part
->master
->sync(part
->master
);
233 static int part_block_isbad(struct mtd_info
*mtd
, loff_t ofs
)
235 struct mtd_part
*part
= PART(mtd
);
236 if (ofs
>= mtd
->size
)
239 return part
->master
->block_isbad(part
->master
, ofs
);
242 static int part_block_markbad(struct mtd_info
*mtd
, loff_t ofs
)
244 struct mtd_part
*part
= PART(mtd
);
247 if (!(mtd
->flags
& MTD_WRITEABLE
))
249 if (ofs
>= mtd
->size
)
252 res
= part
->master
->block_markbad(part
->master
, ofs
);
254 mtd
->ecc_stats
.badblocks
++;
259 * This function unregisters and destroy all slave MTD objects which are
260 * attached to the given master MTD object.
263 int del_mtd_partitions(struct mtd_info
*master
)
265 struct mtd_part
*slave
, *next
;
267 list_for_each_entry_safe(slave
, next
, &mtd_partitions
, list
)
268 if (slave
->master
== master
) {
269 list_del(&slave
->list
);
270 if (slave
->registered
)
271 del_mtd_device(&slave
->mtd
);
278 static struct mtd_part
*add_one_partition(struct mtd_info
*master
,
279 const struct mtd_partition
*part
, int partno
,
282 struct mtd_part
*slave
;
284 /* allocate the partition structure */
285 slave
= kzalloc(sizeof(*slave
), GFP_KERNEL
);
287 printk(KERN_ERR
"memory allocation error while creating partitions for \"%s
\"\n",
289 del_mtd_partitions(master);
292 list_add(&slave->list, &mtd_partitions);
294 /* set up the MTD object for this partition */
295 slave->mtd.type = master->type;
296 slave->mtd.flags = master->flags & ~part->mask_flags;
297 slave->mtd.size = part->size;
298 slave->mtd.writesize = master->writesize;
299 slave->mtd.oobsize = master->oobsize;
300 slave->mtd.oobavail = master->oobavail;
301 slave->mtd.subpage_sft = master->subpage_sft;
303 slave->mtd.name = part->name;
304 slave->mtd.owner = master->owner;
306 slave->mtd.read = part_read;
307 slave->mtd.write = part_write;
309 if (master->panic_write)
310 slave->mtd.panic_write = part_panic_write;
312 if (master->read_oob)
313 slave->mtd.read_oob = part_read_oob;
314 if (master->write_oob)
315 slave->mtd.write_oob = part_write_oob;
316 if (master->read_user_prot_reg)
317 slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
318 if (master->read_fact_prot_reg)
319 slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
320 if (master->write_user_prot_reg)
321 slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
322 if (master->lock_user_prot_reg)
323 slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
324 if (master->get_user_prot_info)
325 slave->mtd.get_user_prot_info = part_get_user_prot_info;
326 if (master->get_fact_prot_info)
327 slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
329 slave->mtd.sync = part_sync;
331 slave->mtd.lock = part_lock;
333 slave->mtd.unlock = part_unlock;
334 if (master->block_isbad)
335 slave->mtd.block_isbad = part_block_isbad;
336 if (master->block_markbad)
337 slave->mtd.block_markbad = part_block_markbad;
338 slave->mtd.erase = part_erase;
339 slave->master = master;
340 slave->offset = part->offset;
341 slave->index = partno;
343 if (slave->offset == MTDPART_OFS_APPEND)
344 slave->offset = cur_offset;
345 if (slave->offset == MTDPART_OFS_NXTBLK) {
346 slave->offset = cur_offset;
347 if (mtd_mod_by_eb(cur_offset, master) != 0) {
348 /* Round up to next erasesize */
349 slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
350 printk(KERN_NOTICE "Moving partition
%d
: "
351 "0x
%012llx
-> 0x
%012llx
\n", partno,
352 (unsigned long long)cur_offset, (unsigned long long)slave->offset);
355 if (slave->mtd.size == MTDPART_SIZ_FULL)
356 slave->mtd.size = master->size - slave->offset;
358 printk(KERN_NOTICE "0x
%012llx
-0x
%012llx
: \"%s
\"\n", (unsigned long long)slave->offset,
359 (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
361 /* let's do some sanity checks */
362 if (slave->offset >= master->size) {
363 /* let's register it anyway to preserve ordering */
366 printk(KERN_ERR"mtd
: partition
\"%s
\" is out of reach
-- disabled
\n",
370 if (slave->offset + slave->mtd.size > master->size) {
371 slave->mtd.size = master->size - slave->offset;
372 printk(KERN_WARNING"mtd
: partition
\"%s
\" extends beyond the end of device
\"%s
\" -- size truncated to
%#llx\n",
373 part->name, master->name, (unsigned long long)slave->mtd.size);
375 if (master->numeraseregions > 1) {
376 /* Deal with variable erase size stuff */
377 int i, max = master->numeraseregions;
378 u64 end = slave->offset + slave->mtd.size;
379 struct mtd_erase_region_info *regions = master->eraseregions;
381 /* Find the first erase regions which is part of this
383 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
385 /* The loop searched for the region _behind_ the first one */
388 /* Pick biggest erasesize */
389 for (; i < max && regions[i].offset < end; i++) {
390 if (slave->mtd.erasesize < regions[i].erasesize) {
391 slave->mtd.erasesize = regions[i].erasesize;
394 BUG_ON(slave->mtd.erasesize == 0);
396 /* Single erase size */
397 slave->mtd.erasesize = master->erasesize;
400 if ((slave->mtd.flags & MTD_WRITEABLE) &&
401 mtd_mod_by_eb(slave->offset, &slave->mtd)) {
402 /* Doesn't start on a boundary of major erase size */
403 /* FIXME: Let it be writable if it is on a boundary of
404 * _minor_ erase size though */
405 slave->mtd.flags &= ~MTD_WRITEABLE;
406 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
409 if ((slave->mtd.flags & MTD_WRITEABLE) &&
410 mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
411 slave->mtd.flags &= ~MTD_WRITEABLE;
412 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
416 slave->mtd.ecclayout = master->ecclayout;
417 if (master->block_isbad) {
420 while (offs < slave->mtd.size) {
421 if (master->block_isbad(master,
422 offs + slave->offset))
423 slave->mtd.ecc_stats.badblocks++;
424 offs += slave->mtd.erasesize;
430 /* store the object pointer (caller may or may not register it*/
431 *part->mtdp = &slave->mtd;
432 slave->registered = 0;
434 /* register our partition */
435 add_mtd_device(&slave->mtd);
436 slave->registered = 1;
442 * This function, given a master MTD object and a partition table, creates
443 * and registers slave MTD objects which are bound to the master according to
444 * the partition definitions.
446 * We don't register the master, or expect the caller to have done so,
447 * for reasons of data integrity.
450 int add_mtd_partitions(struct mtd_info *master,
451 const struct mtd_partition *parts,
454 struct mtd_part *slave;
455 uint64_t cur_offset = 0;
459 * Need to init the list here, since LIST_INIT() does not
460 * work on platforms where relocation has problems (like MIPS
463 if (mtd_partitions.next == NULL)
464 INIT_LIST_HEAD(&mtd_partitions);
466 printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
468 for (i = 0; i < nbparts; i++) {
469 slave = add_one_partition(master, parts + i, i, cur_offset);
472 cur_offset = slave->offset + slave->mtd.size;