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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Simple MTD partitioning layer | |
3 | * | |
a1452a37 DW |
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> | |
1da177e4 | 7 | * |
a1452a37 DW |
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. | |
12 | * | |
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. | |
17 | * | |
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 | |
1da177e4 | 21 | * |
97894cda | 22 | */ |
1da177e4 LT |
23 | |
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> | |
1da177e4 LT |
29 | #include <linux/kmod.h> |
30 | #include <linux/mtd/mtd.h> | |
31 | #include <linux/mtd/partitions.h> | |
5daa7b21 | 32 | #include <linux/err.h> |
1da177e4 | 33 | |
eea72d5f JI |
34 | #include "mtdcore.h" |
35 | ||
1da177e4 LT |
36 | /* Our partition linked list */ |
37 | static LIST_HEAD(mtd_partitions); | |
5daa7b21 | 38 | static DEFINE_MUTEX(mtd_partitions_mutex); |
1da177e4 LT |
39 | |
40 | /* Our partition node structure */ | |
41 | struct mtd_part { | |
42 | struct mtd_info mtd; | |
43 | struct mtd_info *master; | |
69423d99 | 44 | uint64_t offset; |
1da177e4 | 45 | struct list_head list; |
1da177e4 LT |
46 | }; |
47 | ||
48 | /* | |
49 | * Given a pointer to the MTD object in the mtd_part structure, we can retrieve | |
50 | * the pointer to that structure with this macro. | |
51 | */ | |
52 | #define PART(x) ((struct mtd_part *)(x)) | |
53 | ||
97894cda TG |
54 | |
55 | /* | |
1da177e4 LT |
56 | * MTD methods which simply translate the effective address and pass through |
57 | * to the _real_ device. | |
58 | */ | |
59 | ||
b33a2887 AN |
60 | static int part_read(struct mtd_info *mtd, loff_t from, size_t len, |
61 | size_t *retlen, u_char *buf) | |
1da177e4 LT |
62 | { |
63 | struct mtd_part *part = PART(mtd); | |
d8877f19 | 64 | struct mtd_ecc_stats stats; |
f1a28c02 TG |
65 | int res; |
66 | ||
d8877f19 | 67 | stats = part->master->ecc_stats; |
994c8409 MD |
68 | res = part->master->_read(part->master, from + part->offset, len, |
69 | retlen, buf); | |
edbc4540 MD |
70 | if (unlikely(mtd_is_eccerr(res))) |
71 | mtd->ecc_stats.failed += | |
72 | part->master->ecc_stats.failed - stats.failed; | |
73 | else | |
74 | mtd->ecc_stats.corrected += | |
75 | part->master->ecc_stats.corrected - stats.corrected; | |
f1a28c02 | 76 | return res; |
1da177e4 LT |
77 | } |
78 | ||
b33a2887 AN |
79 | static int part_point(struct mtd_info *mtd, loff_t from, size_t len, |
80 | size_t *retlen, void **virt, resource_size_t *phys) | |
1da177e4 LT |
81 | { |
82 | struct mtd_part *part = PART(mtd); | |
5def4898 | 83 | |
994c8409 MD |
84 | return part->master->_point(part->master, from + part->offset, len, |
85 | retlen, virt, phys); | |
1da177e4 | 86 | } |
9223a456 | 87 | |
5e4e6e3f | 88 | static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
1da177e4 LT |
89 | { |
90 | struct mtd_part *part = PART(mtd); | |
91 | ||
994c8409 | 92 | return part->master->_unpoint(part->master, from + part->offset, len); |
1da177e4 LT |
93 | } |
94 | ||
402d3265 DH |
95 | static unsigned long part_get_unmapped_area(struct mtd_info *mtd, |
96 | unsigned long len, | |
97 | unsigned long offset, | |
98 | unsigned long flags) | |
99 | { | |
100 | struct mtd_part *part = PART(mtd); | |
101 | ||
102 | offset += part->offset; | |
994c8409 MD |
103 | return part->master->_get_unmapped_area(part->master, len, offset, |
104 | flags); | |
402d3265 DH |
105 | } |
106 | ||
8593fbc6 | 107 | static int part_read_oob(struct mtd_info *mtd, loff_t from, |
b33a2887 | 108 | struct mtd_oob_ops *ops) |
1da177e4 LT |
109 | { |
110 | struct mtd_part *part = PART(mtd); | |
f1a28c02 | 111 | int res; |
8593fbc6 | 112 | |
1da177e4 | 113 | if (from >= mtd->size) |
8593fbc6 | 114 | return -EINVAL; |
7014568b | 115 | if (ops->datbuf && from + ops->len > mtd->size) |
8593fbc6 | 116 | return -EINVAL; |
f1a28c02 | 117 | |
154bf89f AB |
118 | /* |
119 | * If OOB is also requested, make sure that we do not read past the end | |
120 | * of this partition. | |
121 | */ | |
122 | if (ops->oobbuf) { | |
123 | size_t len, pages; | |
124 | ||
0612b9dd | 125 | if (ops->mode == MTD_OPS_AUTO_OOB) |
154bf89f AB |
126 | len = mtd->oobavail; |
127 | else | |
128 | len = mtd->oobsize; | |
129 | pages = mtd_div_by_ws(mtd->size, mtd); | |
130 | pages -= mtd_div_by_ws(from, mtd); | |
131 | if (ops->ooboffs + ops->ooblen > pages * len) | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
994c8409 | 135 | res = part->master->_read_oob(part->master, from + part->offset, ops); |
f1a28c02 | 136 | if (unlikely(res)) { |
d57f4054 | 137 | if (mtd_is_bitflip(res)) |
f1a28c02 | 138 | mtd->ecc_stats.corrected++; |
d57f4054 | 139 | if (mtd_is_eccerr(res)) |
f1a28c02 TG |
140 | mtd->ecc_stats.failed++; |
141 | } | |
142 | return res; | |
1da177e4 LT |
143 | } |
144 | ||
b33a2887 AN |
145 | static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from, |
146 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
147 | { |
148 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
149 | return part->master->_read_user_prot_reg(part->master, from, len, |
150 | retlen, buf); | |
1da177e4 LT |
151 | } |
152 | ||
4b78fc42 CR |
153 | static int part_get_user_prot_info(struct mtd_info *mtd, size_t len, |
154 | size_t *retlen, struct otp_info *buf) | |
f77814dd NP |
155 | { |
156 | struct mtd_part *part = PART(mtd); | |
4b78fc42 CR |
157 | return part->master->_get_user_prot_info(part->master, len, retlen, |
158 | buf); | |
f77814dd NP |
159 | } |
160 | ||
b33a2887 AN |
161 | static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, |
162 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
163 | { |
164 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
165 | return part->master->_read_fact_prot_reg(part->master, from, len, |
166 | retlen, buf); | |
1da177e4 LT |
167 | } |
168 | ||
4b78fc42 CR |
169 | static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len, |
170 | size_t *retlen, struct otp_info *buf) | |
f77814dd NP |
171 | { |
172 | struct mtd_part *part = PART(mtd); | |
4b78fc42 CR |
173 | return part->master->_get_fact_prot_info(part->master, len, retlen, |
174 | buf); | |
f77814dd NP |
175 | } |
176 | ||
b33a2887 AN |
177 | static int part_write(struct mtd_info *mtd, loff_t to, size_t len, |
178 | size_t *retlen, const u_char *buf) | |
1da177e4 LT |
179 | { |
180 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
181 | return part->master->_write(part->master, to + part->offset, len, |
182 | retlen, buf); | |
1da177e4 LT |
183 | } |
184 | ||
b33a2887 AN |
185 | static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len, |
186 | size_t *retlen, const u_char *buf) | |
388bbb09 RP |
187 | { |
188 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
189 | return part->master->_panic_write(part->master, to + part->offset, len, |
190 | retlen, buf); | |
388bbb09 RP |
191 | } |
192 | ||
8593fbc6 | 193 | static int part_write_oob(struct mtd_info *mtd, loff_t to, |
b33a2887 | 194 | struct mtd_oob_ops *ops) |
1da177e4 LT |
195 | { |
196 | struct mtd_part *part = PART(mtd); | |
8593fbc6 | 197 | |
1da177e4 | 198 | if (to >= mtd->size) |
8593fbc6 | 199 | return -EINVAL; |
7014568b | 200 | if (ops->datbuf && to + ops->len > mtd->size) |
8593fbc6 | 201 | return -EINVAL; |
994c8409 | 202 | return part->master->_write_oob(part->master, to + part->offset, ops); |
1da177e4 LT |
203 | } |
204 | ||
b33a2887 AN |
205 | static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from, |
206 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
207 | { |
208 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
209 | return part->master->_write_user_prot_reg(part->master, from, len, |
210 | retlen, buf); | |
1da177e4 LT |
211 | } |
212 | ||
b33a2887 AN |
213 | static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, |
214 | size_t len) | |
f77814dd NP |
215 | { |
216 | struct mtd_part *part = PART(mtd); | |
994c8409 | 217 | return part->master->_lock_user_prot_reg(part->master, from, len); |
f77814dd NP |
218 | } |
219 | ||
b33a2887 AN |
220 | static int part_writev(struct mtd_info *mtd, const struct kvec *vecs, |
221 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 LT |
222 | { |
223 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
224 | return part->master->_writev(part->master, vecs, count, |
225 | to + part->offset, retlen); | |
1da177e4 LT |
226 | } |
227 | ||
b33a2887 | 228 | static int part_erase(struct mtd_info *mtd, struct erase_info *instr) |
1da177e4 LT |
229 | { |
230 | struct mtd_part *part = PART(mtd); | |
231 | int ret; | |
664addc2 | 232 | |
1da177e4 | 233 | instr->addr += part->offset; |
994c8409 | 234 | ret = part->master->_erase(part->master, instr); |
74641d75 | 235 | if (ret) { |
bb0eb217 | 236 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
74641d75 AH |
237 | instr->fail_addr -= part->offset; |
238 | instr->addr -= part->offset; | |
239 | } | |
1da177e4 LT |
240 | return ret; |
241 | } | |
242 | ||
243 | void mtd_erase_callback(struct erase_info *instr) | |
244 | { | |
3c3c10bb | 245 | if (instr->mtd->_erase == part_erase) { |
1da177e4 LT |
246 | struct mtd_part *part = PART(instr->mtd); |
247 | ||
bb0eb217 | 248 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
1da177e4 LT |
249 | instr->fail_addr -= part->offset; |
250 | instr->addr -= part->offset; | |
251 | } | |
252 | if (instr->callback) | |
253 | instr->callback(instr); | |
254 | } | |
255 | EXPORT_SYMBOL_GPL(mtd_erase_callback); | |
256 | ||
69423d99 | 257 | static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
258 | { |
259 | struct mtd_part *part = PART(mtd); | |
994c8409 | 260 | return part->master->_lock(part->master, ofs + part->offset, len); |
1da177e4 LT |
261 | } |
262 | ||
69423d99 | 263 | static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
264 | { |
265 | struct mtd_part *part = PART(mtd); | |
994c8409 | 266 | return part->master->_unlock(part->master, ofs + part->offset, len); |
1da177e4 LT |
267 | } |
268 | ||
9938424f RC |
269 | static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
270 | { | |
271 | struct mtd_part *part = PART(mtd); | |
994c8409 | 272 | return part->master->_is_locked(part->master, ofs + part->offset, len); |
9938424f RC |
273 | } |
274 | ||
1da177e4 LT |
275 | static void part_sync(struct mtd_info *mtd) |
276 | { | |
277 | struct mtd_part *part = PART(mtd); | |
994c8409 | 278 | part->master->_sync(part->master); |
1da177e4 LT |
279 | } |
280 | ||
281 | static int part_suspend(struct mtd_info *mtd) | |
282 | { | |
283 | struct mtd_part *part = PART(mtd); | |
994c8409 | 284 | return part->master->_suspend(part->master); |
1da177e4 LT |
285 | } |
286 | ||
287 | static void part_resume(struct mtd_info *mtd) | |
288 | { | |
289 | struct mtd_part *part = PART(mtd); | |
994c8409 | 290 | part->master->_resume(part->master); |
1da177e4 LT |
291 | } |
292 | ||
b33a2887 | 293 | static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
294 | { |
295 | struct mtd_part *part = PART(mtd); | |
1da177e4 | 296 | ofs += part->offset; |
994c8409 | 297 | return part->master->_block_isbad(part->master, ofs); |
1da177e4 LT |
298 | } |
299 | ||
b33a2887 | 300 | static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
301 | { |
302 | struct mtd_part *part = PART(mtd); | |
f1a28c02 TG |
303 | int res; |
304 | ||
1da177e4 | 305 | ofs += part->offset; |
994c8409 | 306 | res = part->master->_block_markbad(part->master, ofs); |
f1a28c02 TG |
307 | if (!res) |
308 | mtd->ecc_stats.badblocks++; | |
309 | return res; | |
1da177e4 LT |
310 | } |
311 | ||
5daa7b21 RT |
312 | static inline void free_partition(struct mtd_part *p) |
313 | { | |
314 | kfree(p->mtd.name); | |
315 | kfree(p); | |
316 | } | |
317 | ||
97894cda TG |
318 | /* |
319 | * This function unregisters and destroy all slave MTD objects which are | |
1da177e4 LT |
320 | * attached to the given master MTD object. |
321 | */ | |
322 | ||
323 | int del_mtd_partitions(struct mtd_info *master) | |
324 | { | |
71a928c0 | 325 | struct mtd_part *slave, *next; |
5daa7b21 | 326 | int ret, err = 0; |
1da177e4 | 327 | |
5daa7b21 | 328 | mutex_lock(&mtd_partitions_mutex); |
71a928c0 | 329 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) |
1da177e4 | 330 | if (slave->master == master) { |
5daa7b21 RT |
331 | ret = del_mtd_device(&slave->mtd); |
332 | if (ret < 0) { | |
333 | err = ret; | |
334 | continue; | |
335 | } | |
71a928c0 | 336 | list_del(&slave->list); |
5daa7b21 | 337 | free_partition(slave); |
1da177e4 | 338 | } |
5daa7b21 | 339 | mutex_unlock(&mtd_partitions_mutex); |
1da177e4 | 340 | |
5daa7b21 | 341 | return err; |
1da177e4 LT |
342 | } |
343 | ||
5daa7b21 RT |
344 | static struct mtd_part *allocate_partition(struct mtd_info *master, |
345 | const struct mtd_partition *part, int partno, | |
346 | uint64_t cur_offset) | |
7788ba71 AN |
347 | { |
348 | struct mtd_part *slave; | |
5daa7b21 | 349 | char *name; |
7788ba71 AN |
350 | |
351 | /* allocate the partition structure */ | |
b33a2887 | 352 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
5daa7b21 RT |
353 | name = kstrdup(part->name, GFP_KERNEL); |
354 | if (!name || !slave) { | |
b33a2887 | 355 | printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n", |
5daa7b21 RT |
356 | master->name); |
357 | kfree(name); | |
358 | kfree(slave); | |
359 | return ERR_PTR(-ENOMEM); | |
7788ba71 | 360 | } |
7788ba71 AN |
361 | |
362 | /* set up the MTD object for this partition */ | |
363 | slave->mtd.type = master->type; | |
364 | slave->mtd.flags = master->flags & ~part->mask_flags; | |
365 | slave->mtd.size = part->size; | |
366 | slave->mtd.writesize = master->writesize; | |
7fa33ac0 | 367 | slave->mtd.writebufsize = master->writebufsize; |
7788ba71 AN |
368 | slave->mtd.oobsize = master->oobsize; |
369 | slave->mtd.oobavail = master->oobavail; | |
370 | slave->mtd.subpage_sft = master->subpage_sft; | |
371 | ||
5daa7b21 | 372 | slave->mtd.name = name; |
7788ba71 | 373 | slave->mtd.owner = master->owner; |
402d3265 | 374 | slave->mtd.backing_dev_info = master->backing_dev_info; |
7788ba71 | 375 | |
1f24b5a8 DB |
376 | /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone |
377 | * to have the same data be in two different partitions. | |
378 | */ | |
379 | slave->mtd.dev.parent = master->dev.parent; | |
380 | ||
3c3c10bb AB |
381 | slave->mtd._read = part_read; |
382 | slave->mtd._write = part_write; | |
7788ba71 | 383 | |
3c3c10bb AB |
384 | if (master->_panic_write) |
385 | slave->mtd._panic_write = part_panic_write; | |
7788ba71 | 386 | |
3c3c10bb AB |
387 | if (master->_point && master->_unpoint) { |
388 | slave->mtd._point = part_point; | |
389 | slave->mtd._unpoint = part_unpoint; | |
7788ba71 AN |
390 | } |
391 | ||
3c3c10bb AB |
392 | if (master->_get_unmapped_area) |
393 | slave->mtd._get_unmapped_area = part_get_unmapped_area; | |
394 | if (master->_read_oob) | |
395 | slave->mtd._read_oob = part_read_oob; | |
396 | if (master->_write_oob) | |
397 | slave->mtd._write_oob = part_write_oob; | |
398 | if (master->_read_user_prot_reg) | |
399 | slave->mtd._read_user_prot_reg = part_read_user_prot_reg; | |
400 | if (master->_read_fact_prot_reg) | |
401 | slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg; | |
402 | if (master->_write_user_prot_reg) | |
403 | slave->mtd._write_user_prot_reg = part_write_user_prot_reg; | |
404 | if (master->_lock_user_prot_reg) | |
405 | slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg; | |
406 | if (master->_get_user_prot_info) | |
407 | slave->mtd._get_user_prot_info = part_get_user_prot_info; | |
408 | if (master->_get_fact_prot_info) | |
409 | slave->mtd._get_fact_prot_info = part_get_fact_prot_info; | |
410 | if (master->_sync) | |
411 | slave->mtd._sync = part_sync; | |
412 | if (!partno && !master->dev.class && master->_suspend && | |
413 | master->_resume) { | |
414 | slave->mtd._suspend = part_suspend; | |
415 | slave->mtd._resume = part_resume; | |
7788ba71 | 416 | } |
3c3c10bb AB |
417 | if (master->_writev) |
418 | slave->mtd._writev = part_writev; | |
419 | if (master->_lock) | |
420 | slave->mtd._lock = part_lock; | |
421 | if (master->_unlock) | |
422 | slave->mtd._unlock = part_unlock; | |
423 | if (master->_is_locked) | |
424 | slave->mtd._is_locked = part_is_locked; | |
425 | if (master->_block_isbad) | |
426 | slave->mtd._block_isbad = part_block_isbad; | |
427 | if (master->_block_markbad) | |
428 | slave->mtd._block_markbad = part_block_markbad; | |
429 | slave->mtd._erase = part_erase; | |
7788ba71 AN |
430 | slave->master = master; |
431 | slave->offset = part->offset; | |
7788ba71 AN |
432 | |
433 | if (slave->offset == MTDPART_OFS_APPEND) | |
434 | slave->offset = cur_offset; | |
435 | if (slave->offset == MTDPART_OFS_NXTBLK) { | |
436 | slave->offset = cur_offset; | |
69423d99 | 437 | if (mtd_mod_by_eb(cur_offset, master) != 0) { |
7788ba71 | 438 | /* Round up to next erasesize */ |
69423d99 | 439 | slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize; |
7788ba71 | 440 | printk(KERN_NOTICE "Moving partition %d: " |
69423d99 AH |
441 | "0x%012llx -> 0x%012llx\n", partno, |
442 | (unsigned long long)cur_offset, (unsigned long long)slave->offset); | |
7788ba71 AN |
443 | } |
444 | } | |
1a31368b DES |
445 | if (slave->offset == MTDPART_OFS_RETAIN) { |
446 | slave->offset = cur_offset; | |
447 | if (master->size - slave->offset >= slave->mtd.size) { | |
448 | slave->mtd.size = master->size - slave->offset | |
449 | - slave->mtd.size; | |
450 | } else { | |
451 | printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n", | |
452 | part->name, master->size - slave->offset, | |
453 | slave->mtd.size); | |
454 | /* register to preserve ordering */ | |
455 | goto out_register; | |
456 | } | |
457 | } | |
7788ba71 AN |
458 | if (slave->mtd.size == MTDPART_SIZ_FULL) |
459 | slave->mtd.size = master->size - slave->offset; | |
460 | ||
69423d99 AH |
461 | printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset, |
462 | (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name); | |
7788ba71 AN |
463 | |
464 | /* let's do some sanity checks */ | |
465 | if (slave->offset >= master->size) { | |
f636ffb4 | 466 | /* let's register it anyway to preserve ordering */ |
7788ba71 AN |
467 | slave->offset = 0; |
468 | slave->mtd.size = 0; | |
b33a2887 | 469 | printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n", |
7788ba71 | 470 | part->name); |
f636ffb4 | 471 | goto out_register; |
7788ba71 AN |
472 | } |
473 | if (slave->offset + slave->mtd.size > master->size) { | |
474 | slave->mtd.size = master->size - slave->offset; | |
69423d99 AH |
475 | printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n", |
476 | part->name, master->name, (unsigned long long)slave->mtd.size); | |
7788ba71 | 477 | } |
b33a2887 | 478 | if (master->numeraseregions > 1) { |
7788ba71 | 479 | /* Deal with variable erase size stuff */ |
6910c136 | 480 | int i, max = master->numeraseregions; |
69423d99 | 481 | u64 end = slave->offset + slave->mtd.size; |
7788ba71 AN |
482 | struct mtd_erase_region_info *regions = master->eraseregions; |
483 | ||
6910c136 AN |
484 | /* Find the first erase regions which is part of this |
485 | * partition. */ | |
486 | for (i = 0; i < max && regions[i].offset <= slave->offset; i++) | |
7788ba71 | 487 | ; |
6910c136 | 488 | /* The loop searched for the region _behind_ the first one */ |
a57ca046 RK |
489 | if (i > 0) |
490 | i--; | |
7788ba71 | 491 | |
6910c136 AN |
492 | /* Pick biggest erasesize */ |
493 | for (; i < max && regions[i].offset < end; i++) { | |
7788ba71 AN |
494 | if (slave->mtd.erasesize < regions[i].erasesize) { |
495 | slave->mtd.erasesize = regions[i].erasesize; | |
496 | } | |
497 | } | |
6910c136 | 498 | BUG_ON(slave->mtd.erasesize == 0); |
7788ba71 AN |
499 | } else { |
500 | /* Single erase size */ | |
501 | slave->mtd.erasesize = master->erasesize; | |
502 | } | |
503 | ||
504 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 505 | mtd_mod_by_eb(slave->offset, &slave->mtd)) { |
7788ba71 | 506 | /* Doesn't start on a boundary of major erase size */ |
b33a2887 AN |
507 | /* FIXME: Let it be writable if it is on a boundary of |
508 | * _minor_ erase size though */ | |
7788ba71 | 509 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 510 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n", |
7788ba71 AN |
511 | part->name); |
512 | } | |
513 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 514 | mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) { |
7788ba71 | 515 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 516 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n", |
7788ba71 AN |
517 | part->name); |
518 | } | |
519 | ||
520 | slave->mtd.ecclayout = master->ecclayout; | |
bdf69c47 | 521 | slave->mtd.ecc_step_size = master->ecc_step_size; |
6a918bad | 522 | slave->mtd.ecc_strength = master->ecc_strength; |
d062d4ed MD |
523 | slave->mtd.bitflip_threshold = master->bitflip_threshold; |
524 | ||
3c3c10bb | 525 | if (master->_block_isbad) { |
69423d99 | 526 | uint64_t offs = 0; |
7788ba71 | 527 | |
b33a2887 | 528 | while (offs < slave->mtd.size) { |
7086c19d | 529 | if (mtd_block_isbad(master, offs + slave->offset)) |
7788ba71 AN |
530 | slave->mtd.ecc_stats.badblocks++; |
531 | offs += slave->mtd.erasesize; | |
532 | } | |
533 | } | |
534 | ||
f636ffb4 | 535 | out_register: |
7788ba71 AN |
536 | return slave; |
537 | } | |
538 | ||
26a6d240 | 539 | int mtd_add_partition(struct mtd_info *master, const char *name, |
5daa7b21 RT |
540 | long long offset, long long length) |
541 | { | |
542 | struct mtd_partition part; | |
543 | struct mtd_part *p, *new; | |
544 | uint64_t start, end; | |
545 | int ret = 0; | |
546 | ||
547 | /* the direct offset is expected */ | |
548 | if (offset == MTDPART_OFS_APPEND || | |
549 | offset == MTDPART_OFS_NXTBLK) | |
550 | return -EINVAL; | |
551 | ||
552 | if (length == MTDPART_SIZ_FULL) | |
553 | length = master->size - offset; | |
554 | ||
555 | if (length <= 0) | |
556 | return -EINVAL; | |
557 | ||
558 | part.name = name; | |
559 | part.size = length; | |
560 | part.offset = offset; | |
561 | part.mask_flags = 0; | |
562 | part.ecclayout = NULL; | |
563 | ||
564 | new = allocate_partition(master, &part, -1, offset); | |
565 | if (IS_ERR(new)) | |
566 | return PTR_ERR(new); | |
567 | ||
568 | start = offset; | |
569 | end = offset + length; | |
570 | ||
571 | mutex_lock(&mtd_partitions_mutex); | |
572 | list_for_each_entry(p, &mtd_partitions, list) | |
573 | if (p->master == master) { | |
574 | if ((start >= p->offset) && | |
575 | (start < (p->offset + p->mtd.size))) | |
576 | goto err_inv; | |
577 | ||
578 | if ((end >= p->offset) && | |
579 | (end < (p->offset + p->mtd.size))) | |
580 | goto err_inv; | |
581 | } | |
582 | ||
583 | list_add(&new->list, &mtd_partitions); | |
584 | mutex_unlock(&mtd_partitions_mutex); | |
585 | ||
586 | add_mtd_device(&new->mtd); | |
587 | ||
588 | return ret; | |
589 | err_inv: | |
590 | mutex_unlock(&mtd_partitions_mutex); | |
591 | free_partition(new); | |
592 | return -EINVAL; | |
593 | } | |
594 | EXPORT_SYMBOL_GPL(mtd_add_partition); | |
595 | ||
596 | int mtd_del_partition(struct mtd_info *master, int partno) | |
597 | { | |
598 | struct mtd_part *slave, *next; | |
599 | int ret = -EINVAL; | |
600 | ||
601 | mutex_lock(&mtd_partitions_mutex); | |
602 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) | |
603 | if ((slave->master == master) && | |
604 | (slave->mtd.index == partno)) { | |
605 | ret = del_mtd_device(&slave->mtd); | |
606 | if (ret < 0) | |
607 | break; | |
608 | ||
609 | list_del(&slave->list); | |
610 | free_partition(slave); | |
611 | break; | |
612 | } | |
613 | mutex_unlock(&mtd_partitions_mutex); | |
614 | ||
615 | return ret; | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(mtd_del_partition); | |
618 | ||
1da177e4 LT |
619 | /* |
620 | * This function, given a master MTD object and a partition table, creates | |
621 | * and registers slave MTD objects which are bound to the master according to | |
622 | * the partition definitions. | |
1f24b5a8 DB |
623 | * |
624 | * We don't register the master, or expect the caller to have done so, | |
625 | * for reasons of data integrity. | |
1da177e4 LT |
626 | */ |
627 | ||
97894cda | 628 | int add_mtd_partitions(struct mtd_info *master, |
1da177e4 LT |
629 | const struct mtd_partition *parts, |
630 | int nbparts) | |
631 | { | |
632 | struct mtd_part *slave; | |
69423d99 | 633 | uint64_t cur_offset = 0; |
1da177e4 LT |
634 | int i; |
635 | ||
b33a2887 | 636 | printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); |
1da177e4 LT |
637 | |
638 | for (i = 0; i < nbparts; i++) { | |
5daa7b21 RT |
639 | slave = allocate_partition(master, parts + i, i, cur_offset); |
640 | if (IS_ERR(slave)) | |
641 | return PTR_ERR(slave); | |
642 | ||
643 | mutex_lock(&mtd_partitions_mutex); | |
644 | list_add(&slave->list, &mtd_partitions); | |
645 | mutex_unlock(&mtd_partitions_mutex); | |
646 | ||
647 | add_mtd_device(&slave->mtd); | |
648 | ||
1da177e4 | 649 | cur_offset = slave->offset + slave->mtd.size; |
1da177e4 LT |
650 | } |
651 | ||
652 | return 0; | |
653 | } | |
1da177e4 LT |
654 | |
655 | static DEFINE_SPINLOCK(part_parser_lock); | |
656 | static LIST_HEAD(part_parsers); | |
657 | ||
658 | static struct mtd_part_parser *get_partition_parser(const char *name) | |
659 | { | |
71a928c0 | 660 | struct mtd_part_parser *p, *ret = NULL; |
1da177e4 | 661 | |
71a928c0 | 662 | spin_lock(&part_parser_lock); |
1da177e4 | 663 | |
71a928c0 | 664 | list_for_each_entry(p, &part_parsers, list) |
1da177e4 LT |
665 | if (!strcmp(p->name, name) && try_module_get(p->owner)) { |
666 | ret = p; | |
667 | break; | |
668 | } | |
71a928c0 | 669 | |
1da177e4 LT |
670 | spin_unlock(&part_parser_lock); |
671 | ||
672 | return ret; | |
673 | } | |
674 | ||
953b3bd1 DES |
675 | #define put_partition_parser(p) do { module_put((p)->owner); } while (0) |
676 | ||
6e14a61d | 677 | void register_mtd_parser(struct mtd_part_parser *p) |
1da177e4 LT |
678 | { |
679 | spin_lock(&part_parser_lock); | |
680 | list_add(&p->list, &part_parsers); | |
681 | spin_unlock(&part_parser_lock); | |
1da177e4 | 682 | } |
b33a2887 | 683 | EXPORT_SYMBOL_GPL(register_mtd_parser); |
1da177e4 | 684 | |
cf3b2b1e | 685 | void deregister_mtd_parser(struct mtd_part_parser *p) |
1da177e4 LT |
686 | { |
687 | spin_lock(&part_parser_lock); | |
688 | list_del(&p->list); | |
689 | spin_unlock(&part_parser_lock); | |
1da177e4 | 690 | } |
b33a2887 | 691 | EXPORT_SYMBOL_GPL(deregister_mtd_parser); |
1da177e4 | 692 | |
ad274cec AB |
693 | /* |
694 | * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you | |
695 | * are changing this array! | |
696 | */ | |
ccef4dcc | 697 | static const char * const default_mtd_part_types[] = { |
d26c87d6 DES |
698 | "cmdlinepart", |
699 | "ofpart", | |
700 | NULL | |
701 | }; | |
5c4eefbd | 702 | |
ad274cec AB |
703 | /** |
704 | * parse_mtd_partitions - parse MTD partitions | |
705 | * @master: the master partition (describes whole MTD device) | |
706 | * @types: names of partition parsers to try or %NULL | |
707 | * @pparts: array of partitions found is returned here | |
c7975330 | 708 | * @data: MTD partition parser-specific data |
ad274cec AB |
709 | * |
710 | * This function tries to find partition on MTD device @master. It uses MTD | |
711 | * partition parsers, specified in @types. However, if @types is %NULL, then | |
712 | * the default list of parsers is used. The default list contains only the | |
d26c87d6 | 713 | * "cmdlinepart" and "ofpart" parsers ATM. |
c51803dd HS |
714 | * Note: If there are more then one parser in @types, the kernel only takes the |
715 | * partitions parsed out by the first parser. | |
ad274cec AB |
716 | * |
717 | * This function may return: | |
718 | * o a negative error code in case of failure | |
719 | * o zero if no partitions were found | |
720 | * o a positive number of found partitions, in which case on exit @pparts will | |
721 | * point to an array containing this number of &struct mtd_info objects. | |
722 | */ | |
26a47346 | 723 | int parse_mtd_partitions(struct mtd_info *master, const char *const *types, |
c7975330 DES |
724 | struct mtd_partition **pparts, |
725 | struct mtd_part_parser_data *data) | |
1da177e4 LT |
726 | { |
727 | struct mtd_part_parser *parser; | |
728 | int ret = 0; | |
97894cda | 729 | |
5c4eefbd DES |
730 | if (!types) |
731 | types = default_mtd_part_types; | |
732 | ||
1da177e4 LT |
733 | for ( ; ret <= 0 && *types; types++) { |
734 | parser = get_partition_parser(*types); | |
1da177e4 | 735 | if (!parser && !request_module("%s", *types)) |
58edc904 | 736 | parser = get_partition_parser(*types); |
7c802fbd | 737 | if (!parser) |
1da177e4 | 738 | continue; |
c7975330 | 739 | ret = (*parser->parse_fn)(master, pparts, data); |
c51803dd | 740 | put_partition_parser(parser); |
1da177e4 | 741 | if (ret > 0) { |
97894cda | 742 | printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n", |
1da177e4 | 743 | ret, parser->name, master->name); |
c51803dd | 744 | break; |
1da177e4 | 745 | } |
1da177e4 LT |
746 | } |
747 | return ret; | |
748 | } | |
5daa7b21 | 749 | |
5dee4674 | 750 | int mtd_is_partition(const struct mtd_info *mtd) |
5daa7b21 RT |
751 | { |
752 | struct mtd_part *part; | |
a7e93dcd | 753 | int ispart = 0; |
5daa7b21 RT |
754 | |
755 | mutex_lock(&mtd_partitions_mutex); | |
756 | list_for_each_entry(part, &mtd_partitions, list) | |
757 | if (&part->mtd == mtd) { | |
a7e93dcd | 758 | ispart = 1; |
5daa7b21 RT |
759 | break; |
760 | } | |
761 | mutex_unlock(&mtd_partitions_mutex); | |
762 | ||
a7e93dcd | 763 | return ispart; |
5daa7b21 | 764 | } |
a7e93dcd | 765 | EXPORT_SYMBOL_GPL(mtd_is_partition); |
62082e56 RG |
766 | |
767 | /* Returns the size of the entire flash chip */ | |
768 | uint64_t mtd_get_device_size(const struct mtd_info *mtd) | |
769 | { | |
770 | if (!mtd_is_partition(mtd)) | |
771 | return mtd->size; | |
772 | ||
773 | return PART(mtd)->master->size; | |
774 | } | |
775 | EXPORT_SYMBOL_GPL(mtd_get_device_size); |