Commit | Line | Data |
---|---|---|
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 | ||
6fa3eb70 S |
36 | #define DYNAMIC_CHANGE_MTD_WRITEABLE |
37 | #ifdef DYNAMIC_CHANGE_MTD_WRITEABLE //wschen 2011-01-05 | |
38 | #include <linux/proc_fs.h> | |
39 | #include <asm/uaccess.h> | |
40 | static struct mtd_info *my_mtd = NULL; | |
41 | int mtd_writeable_proc_write(struct file *file, const char *buffer, unsigned long count, void *data); | |
42 | ||
43 | struct mtd_change { | |
44 | uint64_t size; | |
45 | uint64_t offset; | |
46 | }; | |
47 | int mtd_change_proc_write(struct file *file, const char *buffer, unsigned long count, void *data); | |
48 | #endif | |
49 | ||
50 | ||
1da177e4 LT |
51 | /* Our partition linked list */ |
52 | static LIST_HEAD(mtd_partitions); | |
5daa7b21 | 53 | static DEFINE_MUTEX(mtd_partitions_mutex); |
1da177e4 LT |
54 | |
55 | /* Our partition node structure */ | |
56 | struct mtd_part { | |
57 | struct mtd_info mtd; | |
58 | struct mtd_info *master; | |
69423d99 | 59 | uint64_t offset; |
1da177e4 | 60 | struct list_head list; |
1da177e4 LT |
61 | }; |
62 | ||
63 | /* | |
64 | * Given a pointer to the MTD object in the mtd_part structure, we can retrieve | |
65 | * the pointer to that structure with this macro. | |
66 | */ | |
67 | #define PART(x) ((struct mtd_part *)(x)) | |
68 | ||
97894cda TG |
69 | |
70 | /* | |
1da177e4 LT |
71 | * MTD methods which simply translate the effective address and pass through |
72 | * to the _real_ device. | |
73 | */ | |
74 | ||
b33a2887 AN |
75 | static int part_read(struct mtd_info *mtd, loff_t from, size_t len, |
76 | size_t *retlen, u_char *buf) | |
1da177e4 LT |
77 | { |
78 | struct mtd_part *part = PART(mtd); | |
d8877f19 | 79 | struct mtd_ecc_stats stats; |
f1a28c02 TG |
80 | int res; |
81 | ||
d8877f19 | 82 | stats = part->master->ecc_stats; |
994c8409 MD |
83 | res = part->master->_read(part->master, from + part->offset, len, |
84 | retlen, buf); | |
edbc4540 MD |
85 | if (unlikely(mtd_is_eccerr(res))) |
86 | mtd->ecc_stats.failed += | |
87 | part->master->ecc_stats.failed - stats.failed; | |
88 | else | |
89 | mtd->ecc_stats.corrected += | |
90 | part->master->ecc_stats.corrected - stats.corrected; | |
f1a28c02 | 91 | return res; |
1da177e4 LT |
92 | } |
93 | ||
b33a2887 AN |
94 | static int part_point(struct mtd_info *mtd, loff_t from, size_t len, |
95 | size_t *retlen, void **virt, resource_size_t *phys) | |
1da177e4 LT |
96 | { |
97 | struct mtd_part *part = PART(mtd); | |
5def4898 | 98 | |
994c8409 MD |
99 | return part->master->_point(part->master, from + part->offset, len, |
100 | retlen, virt, phys); | |
1da177e4 | 101 | } |
9223a456 | 102 | |
5e4e6e3f | 103 | static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
1da177e4 LT |
104 | { |
105 | struct mtd_part *part = PART(mtd); | |
106 | ||
994c8409 | 107 | return part->master->_unpoint(part->master, from + part->offset, len); |
1da177e4 LT |
108 | } |
109 | ||
402d3265 DH |
110 | static unsigned long part_get_unmapped_area(struct mtd_info *mtd, |
111 | unsigned long len, | |
112 | unsigned long offset, | |
113 | unsigned long flags) | |
114 | { | |
115 | struct mtd_part *part = PART(mtd); | |
116 | ||
117 | offset += part->offset; | |
994c8409 MD |
118 | return part->master->_get_unmapped_area(part->master, len, offset, |
119 | flags); | |
402d3265 DH |
120 | } |
121 | ||
8593fbc6 | 122 | static int part_read_oob(struct mtd_info *mtd, loff_t from, |
b33a2887 | 123 | struct mtd_oob_ops *ops) |
1da177e4 LT |
124 | { |
125 | struct mtd_part *part = PART(mtd); | |
f1a28c02 | 126 | int res; |
8593fbc6 | 127 | |
1da177e4 | 128 | if (from >= mtd->size) |
8593fbc6 | 129 | return -EINVAL; |
7014568b | 130 | if (ops->datbuf && from + ops->len > mtd->size) |
8593fbc6 | 131 | return -EINVAL; |
f1a28c02 | 132 | |
154bf89f AB |
133 | /* |
134 | * If OOB is also requested, make sure that we do not read past the end | |
135 | * of this partition. | |
136 | */ | |
137 | if (ops->oobbuf) { | |
138 | size_t len, pages; | |
139 | ||
0612b9dd | 140 | if (ops->mode == MTD_OPS_AUTO_OOB) |
154bf89f AB |
141 | len = mtd->oobavail; |
142 | else | |
143 | len = mtd->oobsize; | |
144 | pages = mtd_div_by_ws(mtd->size, mtd); | |
145 | pages -= mtd_div_by_ws(from, mtd); | |
146 | if (ops->ooboffs + ops->ooblen > pages * len) | |
147 | return -EINVAL; | |
148 | } | |
149 | ||
994c8409 | 150 | res = part->master->_read_oob(part->master, from + part->offset, ops); |
f1a28c02 | 151 | if (unlikely(res)) { |
d57f4054 | 152 | if (mtd_is_bitflip(res)) |
f1a28c02 | 153 | mtd->ecc_stats.corrected++; |
d57f4054 | 154 | if (mtd_is_eccerr(res)) |
f1a28c02 TG |
155 | mtd->ecc_stats.failed++; |
156 | } | |
157 | return res; | |
1da177e4 LT |
158 | } |
159 | ||
b33a2887 AN |
160 | static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from, |
161 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
162 | { |
163 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
164 | return part->master->_read_user_prot_reg(part->master, from, len, |
165 | retlen, buf); | |
1da177e4 LT |
166 | } |
167 | ||
b33a2887 AN |
168 | static int part_get_user_prot_info(struct mtd_info *mtd, |
169 | struct otp_info *buf, size_t len) | |
f77814dd NP |
170 | { |
171 | struct mtd_part *part = PART(mtd); | |
994c8409 | 172 | return part->master->_get_user_prot_info(part->master, buf, len); |
f77814dd NP |
173 | } |
174 | ||
b33a2887 AN |
175 | static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, |
176 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
177 | { |
178 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
179 | return part->master->_read_fact_prot_reg(part->master, from, len, |
180 | retlen, buf); | |
1da177e4 LT |
181 | } |
182 | ||
b33a2887 AN |
183 | static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf, |
184 | size_t len) | |
f77814dd NP |
185 | { |
186 | struct mtd_part *part = PART(mtd); | |
994c8409 | 187 | return part->master->_get_fact_prot_info(part->master, buf, len); |
f77814dd NP |
188 | } |
189 | ||
b33a2887 AN |
190 | static int part_write(struct mtd_info *mtd, loff_t to, size_t len, |
191 | size_t *retlen, const u_char *buf) | |
1da177e4 LT |
192 | { |
193 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
194 | return part->master->_write(part->master, to + part->offset, len, |
195 | retlen, buf); | |
1da177e4 LT |
196 | } |
197 | ||
b33a2887 AN |
198 | static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len, |
199 | size_t *retlen, const u_char *buf) | |
388bbb09 RP |
200 | { |
201 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
202 | return part->master->_panic_write(part->master, to + part->offset, len, |
203 | retlen, buf); | |
388bbb09 RP |
204 | } |
205 | ||
8593fbc6 | 206 | static int part_write_oob(struct mtd_info *mtd, loff_t to, |
b33a2887 | 207 | struct mtd_oob_ops *ops) |
1da177e4 LT |
208 | { |
209 | struct mtd_part *part = PART(mtd); | |
8593fbc6 | 210 | |
1da177e4 | 211 | if (to >= mtd->size) |
8593fbc6 | 212 | return -EINVAL; |
7014568b | 213 | if (ops->datbuf && to + ops->len > mtd->size) |
8593fbc6 | 214 | return -EINVAL; |
994c8409 | 215 | return part->master->_write_oob(part->master, to + part->offset, ops); |
1da177e4 LT |
216 | } |
217 | ||
b33a2887 AN |
218 | static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from, |
219 | size_t len, size_t *retlen, u_char *buf) | |
1da177e4 LT |
220 | { |
221 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
222 | return part->master->_write_user_prot_reg(part->master, from, len, |
223 | retlen, buf); | |
1da177e4 LT |
224 | } |
225 | ||
b33a2887 AN |
226 | static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, |
227 | size_t len) | |
f77814dd NP |
228 | { |
229 | struct mtd_part *part = PART(mtd); | |
994c8409 | 230 | return part->master->_lock_user_prot_reg(part->master, from, len); |
f77814dd NP |
231 | } |
232 | ||
b33a2887 AN |
233 | static int part_writev(struct mtd_info *mtd, const struct kvec *vecs, |
234 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 LT |
235 | { |
236 | struct mtd_part *part = PART(mtd); | |
994c8409 MD |
237 | return part->master->_writev(part->master, vecs, count, |
238 | to + part->offset, retlen); | |
1da177e4 LT |
239 | } |
240 | ||
b33a2887 | 241 | static int part_erase(struct mtd_info *mtd, struct erase_info *instr) |
1da177e4 LT |
242 | { |
243 | struct mtd_part *part = PART(mtd); | |
244 | int ret; | |
664addc2 | 245 | |
1da177e4 | 246 | instr->addr += part->offset; |
994c8409 | 247 | ret = part->master->_erase(part->master, instr); |
74641d75 | 248 | if (ret) { |
bb0eb217 | 249 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
74641d75 AH |
250 | instr->fail_addr -= part->offset; |
251 | instr->addr -= part->offset; | |
252 | } | |
1da177e4 LT |
253 | return ret; |
254 | } | |
255 | ||
256 | void mtd_erase_callback(struct erase_info *instr) | |
257 | { | |
3c3c10bb | 258 | if (instr->mtd->_erase == part_erase) { |
1da177e4 LT |
259 | struct mtd_part *part = PART(instr->mtd); |
260 | ||
bb0eb217 | 261 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
1da177e4 LT |
262 | instr->fail_addr -= part->offset; |
263 | instr->addr -= part->offset; | |
264 | } | |
265 | if (instr->callback) | |
266 | instr->callback(instr); | |
267 | } | |
268 | EXPORT_SYMBOL_GPL(mtd_erase_callback); | |
269 | ||
69423d99 | 270 | static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
271 | { |
272 | struct mtd_part *part = PART(mtd); | |
994c8409 | 273 | return part->master->_lock(part->master, ofs + part->offset, len); |
1da177e4 LT |
274 | } |
275 | ||
69423d99 | 276 | static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
1da177e4 LT |
277 | { |
278 | struct mtd_part *part = PART(mtd); | |
994c8409 | 279 | return part->master->_unlock(part->master, ofs + part->offset, len); |
1da177e4 LT |
280 | } |
281 | ||
9938424f RC |
282 | static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
283 | { | |
284 | struct mtd_part *part = PART(mtd); | |
994c8409 | 285 | return part->master->_is_locked(part->master, ofs + part->offset, len); |
9938424f RC |
286 | } |
287 | ||
1da177e4 LT |
288 | static void part_sync(struct mtd_info *mtd) |
289 | { | |
290 | struct mtd_part *part = PART(mtd); | |
994c8409 | 291 | part->master->_sync(part->master); |
1da177e4 LT |
292 | } |
293 | ||
294 | static int part_suspend(struct mtd_info *mtd) | |
295 | { | |
296 | struct mtd_part *part = PART(mtd); | |
994c8409 | 297 | return part->master->_suspend(part->master); |
1da177e4 LT |
298 | } |
299 | ||
300 | static void part_resume(struct mtd_info *mtd) | |
301 | { | |
302 | struct mtd_part *part = PART(mtd); | |
994c8409 | 303 | part->master->_resume(part->master); |
1da177e4 LT |
304 | } |
305 | ||
b33a2887 | 306 | static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
307 | { |
308 | struct mtd_part *part = PART(mtd); | |
1da177e4 | 309 | ofs += part->offset; |
994c8409 | 310 | return part->master->_block_isbad(part->master, ofs); |
1da177e4 LT |
311 | } |
312 | ||
b33a2887 | 313 | static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) |
1da177e4 LT |
314 | { |
315 | struct mtd_part *part = PART(mtd); | |
f1a28c02 TG |
316 | int res; |
317 | ||
1da177e4 | 318 | ofs += part->offset; |
994c8409 | 319 | res = part->master->_block_markbad(part->master, ofs); |
f1a28c02 TG |
320 | if (!res) |
321 | mtd->ecc_stats.badblocks++; | |
322 | return res; | |
1da177e4 LT |
323 | } |
324 | ||
5daa7b21 RT |
325 | static inline void free_partition(struct mtd_part *p) |
326 | { | |
327 | kfree(p->mtd.name); | |
328 | kfree(p); | |
329 | } | |
330 | ||
97894cda TG |
331 | /* |
332 | * This function unregisters and destroy all slave MTD objects which are | |
1da177e4 LT |
333 | * attached to the given master MTD object. |
334 | */ | |
335 | ||
336 | int del_mtd_partitions(struct mtd_info *master) | |
337 | { | |
71a928c0 | 338 | struct mtd_part *slave, *next; |
5daa7b21 | 339 | int ret, err = 0; |
1da177e4 | 340 | |
5daa7b21 | 341 | mutex_lock(&mtd_partitions_mutex); |
71a928c0 | 342 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) |
1da177e4 | 343 | if (slave->master == master) { |
6fa3eb70 S |
344 | #ifdef DYNAMIC_CHANGE_MTD_WRITEABLE //wschen 2011-01-05 |
345 | my_mtd = NULL; | |
346 | #endif | |
347 | ||
5daa7b21 RT |
348 | ret = del_mtd_device(&slave->mtd); |
349 | if (ret < 0) { | |
350 | err = ret; | |
351 | continue; | |
352 | } | |
71a928c0 | 353 | list_del(&slave->list); |
5daa7b21 | 354 | free_partition(slave); |
1da177e4 | 355 | } |
5daa7b21 | 356 | mutex_unlock(&mtd_partitions_mutex); |
1da177e4 | 357 | |
5daa7b21 | 358 | return err; |
1da177e4 LT |
359 | } |
360 | ||
5daa7b21 RT |
361 | static struct mtd_part *allocate_partition(struct mtd_info *master, |
362 | const struct mtd_partition *part, int partno, | |
363 | uint64_t cur_offset) | |
7788ba71 AN |
364 | { |
365 | struct mtd_part *slave; | |
5daa7b21 | 366 | char *name; |
7788ba71 AN |
367 | |
368 | /* allocate the partition structure */ | |
b33a2887 | 369 | slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
5daa7b21 RT |
370 | name = kstrdup(part->name, GFP_KERNEL); |
371 | if (!name || !slave) { | |
b33a2887 | 372 | printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n", |
5daa7b21 RT |
373 | master->name); |
374 | kfree(name); | |
375 | kfree(slave); | |
376 | return ERR_PTR(-ENOMEM); | |
7788ba71 | 377 | } |
7788ba71 AN |
378 | |
379 | /* set up the MTD object for this partition */ | |
380 | slave->mtd.type = master->type; | |
381 | slave->mtd.flags = master->flags & ~part->mask_flags; | |
382 | slave->mtd.size = part->size; | |
383 | slave->mtd.writesize = master->writesize; | |
7fa33ac0 | 384 | slave->mtd.writebufsize = master->writebufsize; |
7788ba71 AN |
385 | slave->mtd.oobsize = master->oobsize; |
386 | slave->mtd.oobavail = master->oobavail; | |
387 | slave->mtd.subpage_sft = master->subpage_sft; | |
388 | ||
5daa7b21 | 389 | slave->mtd.name = name; |
7788ba71 | 390 | slave->mtd.owner = master->owner; |
402d3265 | 391 | slave->mtd.backing_dev_info = master->backing_dev_info; |
7788ba71 | 392 | |
1f24b5a8 DB |
393 | /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone |
394 | * to have the same data be in two different partitions. | |
395 | */ | |
396 | slave->mtd.dev.parent = master->dev.parent; | |
397 | ||
3c3c10bb AB |
398 | slave->mtd._read = part_read; |
399 | slave->mtd._write = part_write; | |
7788ba71 | 400 | |
3c3c10bb AB |
401 | if (master->_panic_write) |
402 | slave->mtd._panic_write = part_panic_write; | |
7788ba71 | 403 | |
3c3c10bb AB |
404 | if (master->_point && master->_unpoint) { |
405 | slave->mtd._point = part_point; | |
406 | slave->mtd._unpoint = part_unpoint; | |
7788ba71 AN |
407 | } |
408 | ||
3c3c10bb AB |
409 | if (master->_get_unmapped_area) |
410 | slave->mtd._get_unmapped_area = part_get_unmapped_area; | |
411 | if (master->_read_oob) | |
412 | slave->mtd._read_oob = part_read_oob; | |
413 | if (master->_write_oob) | |
414 | slave->mtd._write_oob = part_write_oob; | |
415 | if (master->_read_user_prot_reg) | |
416 | slave->mtd._read_user_prot_reg = part_read_user_prot_reg; | |
417 | if (master->_read_fact_prot_reg) | |
418 | slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg; | |
419 | if (master->_write_user_prot_reg) | |
420 | slave->mtd._write_user_prot_reg = part_write_user_prot_reg; | |
421 | if (master->_lock_user_prot_reg) | |
422 | slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg; | |
423 | if (master->_get_user_prot_info) | |
424 | slave->mtd._get_user_prot_info = part_get_user_prot_info; | |
425 | if (master->_get_fact_prot_info) | |
426 | slave->mtd._get_fact_prot_info = part_get_fact_prot_info; | |
427 | if (master->_sync) | |
428 | slave->mtd._sync = part_sync; | |
429 | if (!partno && !master->dev.class && master->_suspend && | |
430 | master->_resume) { | |
431 | slave->mtd._suspend = part_suspend; | |
432 | slave->mtd._resume = part_resume; | |
7788ba71 | 433 | } |
3c3c10bb AB |
434 | if (master->_writev) |
435 | slave->mtd._writev = part_writev; | |
436 | if (master->_lock) | |
437 | slave->mtd._lock = part_lock; | |
438 | if (master->_unlock) | |
439 | slave->mtd._unlock = part_unlock; | |
440 | if (master->_is_locked) | |
441 | slave->mtd._is_locked = part_is_locked; | |
442 | if (master->_block_isbad) | |
443 | slave->mtd._block_isbad = part_block_isbad; | |
444 | if (master->_block_markbad) | |
445 | slave->mtd._block_markbad = part_block_markbad; | |
446 | slave->mtd._erase = part_erase; | |
7788ba71 AN |
447 | slave->master = master; |
448 | slave->offset = part->offset; | |
7788ba71 AN |
449 | |
450 | if (slave->offset == MTDPART_OFS_APPEND) | |
451 | slave->offset = cur_offset; | |
452 | if (slave->offset == MTDPART_OFS_NXTBLK) { | |
453 | slave->offset = cur_offset; | |
69423d99 | 454 | if (mtd_mod_by_eb(cur_offset, master) != 0) { |
7788ba71 | 455 | /* Round up to next erasesize */ |
69423d99 | 456 | slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize; |
7788ba71 | 457 | printk(KERN_NOTICE "Moving partition %d: " |
69423d99 AH |
458 | "0x%012llx -> 0x%012llx\n", partno, |
459 | (unsigned long long)cur_offset, (unsigned long long)slave->offset); | |
7788ba71 AN |
460 | } |
461 | } | |
1a31368b DES |
462 | if (slave->offset == MTDPART_OFS_RETAIN) { |
463 | slave->offset = cur_offset; | |
464 | if (master->size - slave->offset >= slave->mtd.size) { | |
465 | slave->mtd.size = master->size - slave->offset | |
466 | - slave->mtd.size; | |
467 | } else { | |
468 | printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n", | |
469 | part->name, master->size - slave->offset, | |
470 | slave->mtd.size); | |
471 | /* register to preserve ordering */ | |
472 | goto out_register; | |
473 | } | |
474 | } | |
7788ba71 AN |
475 | if (slave->mtd.size == MTDPART_SIZ_FULL) |
476 | slave->mtd.size = master->size - slave->offset; | |
477 | ||
69423d99 AH |
478 | printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset, |
479 | (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name); | |
7788ba71 AN |
480 | |
481 | /* let's do some sanity checks */ | |
482 | if (slave->offset >= master->size) { | |
f636ffb4 | 483 | /* let's register it anyway to preserve ordering */ |
7788ba71 AN |
484 | slave->offset = 0; |
485 | slave->mtd.size = 0; | |
b33a2887 | 486 | printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n", |
7788ba71 | 487 | part->name); |
f636ffb4 | 488 | goto out_register; |
7788ba71 AN |
489 | } |
490 | if (slave->offset + slave->mtd.size > master->size) { | |
491 | slave->mtd.size = master->size - slave->offset; | |
69423d99 AH |
492 | printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n", |
493 | part->name, master->name, (unsigned long long)slave->mtd.size); | |
7788ba71 | 494 | } |
b33a2887 | 495 | if (master->numeraseregions > 1) { |
7788ba71 | 496 | /* Deal with variable erase size stuff */ |
6910c136 | 497 | int i, max = master->numeraseregions; |
69423d99 | 498 | u64 end = slave->offset + slave->mtd.size; |
7788ba71 AN |
499 | struct mtd_erase_region_info *regions = master->eraseregions; |
500 | ||
6910c136 AN |
501 | /* Find the first erase regions which is part of this |
502 | * partition. */ | |
503 | for (i = 0; i < max && regions[i].offset <= slave->offset; i++) | |
7788ba71 | 504 | ; |
6910c136 | 505 | /* The loop searched for the region _behind_ the first one */ |
a57ca046 RK |
506 | if (i > 0) |
507 | i--; | |
7788ba71 | 508 | |
6910c136 AN |
509 | /* Pick biggest erasesize */ |
510 | for (; i < max && regions[i].offset < end; i++) { | |
7788ba71 AN |
511 | if (slave->mtd.erasesize < regions[i].erasesize) { |
512 | slave->mtd.erasesize = regions[i].erasesize; | |
513 | } | |
514 | } | |
6910c136 | 515 | BUG_ON(slave->mtd.erasesize == 0); |
7788ba71 AN |
516 | } else { |
517 | /* Single erase size */ | |
518 | slave->mtd.erasesize = master->erasesize; | |
519 | } | |
520 | ||
521 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 522 | mtd_mod_by_eb(slave->offset, &slave->mtd)) { |
7788ba71 | 523 | /* Doesn't start on a boundary of major erase size */ |
b33a2887 AN |
524 | /* FIXME: Let it be writable if it is on a boundary of |
525 | * _minor_ erase size though */ | |
7788ba71 | 526 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 527 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n", |
7788ba71 AN |
528 | part->name); |
529 | } | |
530 | if ((slave->mtd.flags & MTD_WRITEABLE) && | |
69423d99 | 531 | mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) { |
7788ba71 | 532 | slave->mtd.flags &= ~MTD_WRITEABLE; |
b33a2887 | 533 | printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n", |
7788ba71 AN |
534 | part->name); |
535 | } | |
536 | ||
537 | slave->mtd.ecclayout = master->ecclayout; | |
6a918bad | 538 | slave->mtd.ecc_strength = master->ecc_strength; |
d062d4ed MD |
539 | slave->mtd.bitflip_threshold = master->bitflip_threshold; |
540 | ||
3c3c10bb | 541 | if (master->_block_isbad) { |
69423d99 | 542 | uint64_t offs = 0; |
7788ba71 | 543 | |
b33a2887 | 544 | while (offs < slave->mtd.size) { |
7086c19d | 545 | if (mtd_block_isbad(master, offs + slave->offset)) |
7788ba71 AN |
546 | slave->mtd.ecc_stats.badblocks++; |
547 | offs += slave->mtd.erasesize; | |
548 | } | |
549 | } | |
550 | ||
f636ffb4 | 551 | out_register: |
7788ba71 AN |
552 | return slave; |
553 | } | |
554 | ||
5daa7b21 RT |
555 | int mtd_add_partition(struct mtd_info *master, char *name, |
556 | long long offset, long long length) | |
557 | { | |
558 | struct mtd_partition part; | |
559 | struct mtd_part *p, *new; | |
560 | uint64_t start, end; | |
561 | int ret = 0; | |
562 | ||
563 | /* the direct offset is expected */ | |
564 | if (offset == MTDPART_OFS_APPEND || | |
565 | offset == MTDPART_OFS_NXTBLK) | |
566 | return -EINVAL; | |
567 | ||
568 | if (length == MTDPART_SIZ_FULL) | |
569 | length = master->size - offset; | |
570 | ||
571 | if (length <= 0) | |
572 | return -EINVAL; | |
573 | ||
574 | part.name = name; | |
575 | part.size = length; | |
576 | part.offset = offset; | |
577 | part.mask_flags = 0; | |
578 | part.ecclayout = NULL; | |
579 | ||
580 | new = allocate_partition(master, &part, -1, offset); | |
581 | if (IS_ERR(new)) | |
582 | return PTR_ERR(new); | |
583 | ||
584 | start = offset; | |
585 | end = offset + length; | |
586 | ||
587 | mutex_lock(&mtd_partitions_mutex); | |
588 | list_for_each_entry(p, &mtd_partitions, list) | |
589 | if (p->master == master) { | |
590 | if ((start >= p->offset) && | |
591 | (start < (p->offset + p->mtd.size))) | |
592 | goto err_inv; | |
593 | ||
594 | if ((end >= p->offset) && | |
595 | (end < (p->offset + p->mtd.size))) | |
596 | goto err_inv; | |
597 | } | |
598 | ||
599 | list_add(&new->list, &mtd_partitions); | |
600 | mutex_unlock(&mtd_partitions_mutex); | |
601 | ||
602 | add_mtd_device(&new->mtd); | |
603 | ||
604 | return ret; | |
605 | err_inv: | |
606 | mutex_unlock(&mtd_partitions_mutex); | |
607 | free_partition(new); | |
608 | return -EINVAL; | |
609 | } | |
610 | EXPORT_SYMBOL_GPL(mtd_add_partition); | |
611 | ||
612 | int mtd_del_partition(struct mtd_info *master, int partno) | |
613 | { | |
614 | struct mtd_part *slave, *next; | |
615 | int ret = -EINVAL; | |
616 | ||
617 | mutex_lock(&mtd_partitions_mutex); | |
618 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) | |
619 | if ((slave->master == master) && | |
620 | (slave->mtd.index == partno)) { | |
621 | ret = del_mtd_device(&slave->mtd); | |
622 | if (ret < 0) | |
623 | break; | |
624 | ||
625 | list_del(&slave->list); | |
626 | free_partition(slave); | |
627 | break; | |
628 | } | |
629 | mutex_unlock(&mtd_partitions_mutex); | |
630 | ||
631 | return ret; | |
632 | } | |
633 | EXPORT_SYMBOL_GPL(mtd_del_partition); | |
634 | ||
1da177e4 LT |
635 | /* |
636 | * This function, given a master MTD object and a partition table, creates | |
637 | * and registers slave MTD objects which are bound to the master according to | |
638 | * the partition definitions. | |
1f24b5a8 DB |
639 | * |
640 | * We don't register the master, or expect the caller to have done so, | |
641 | * for reasons of data integrity. | |
1da177e4 LT |
642 | */ |
643 | ||
97894cda | 644 | int add_mtd_partitions(struct mtd_info *master, |
1da177e4 LT |
645 | const struct mtd_partition *parts, |
646 | int nbparts) | |
647 | { | |
648 | struct mtd_part *slave; | |
69423d99 | 649 | uint64_t cur_offset = 0; |
1da177e4 LT |
650 | int i; |
651 | ||
b33a2887 | 652 | printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); |
1da177e4 LT |
653 | |
654 | for (i = 0; i < nbparts; i++) { | |
5daa7b21 | 655 | slave = allocate_partition(master, parts + i, i, cur_offset); |
98b3bd61 BB |
656 | if (IS_ERR(slave)) { |
657 | del_mtd_partitions(master); | |
5daa7b21 | 658 | return PTR_ERR(slave); |
98b3bd61 | 659 | } |
5daa7b21 RT |
660 | |
661 | mutex_lock(&mtd_partitions_mutex); | |
662 | list_add(&slave->list, &mtd_partitions); | |
663 | mutex_unlock(&mtd_partitions_mutex); | |
664 | ||
665 | add_mtd_device(&slave->mtd); | |
666 | ||
1da177e4 | 667 | cur_offset = slave->offset + slave->mtd.size; |
1da177e4 | 668 | } |
6fa3eb70 S |
669 | #ifdef DYNAMIC_CHANGE_MTD_WRITEABLE //wschen 2011-01-05 |
670 | my_mtd = master; | |
671 | #endif | |
1da177e4 LT |
672 | return 0; |
673 | } | |
1da177e4 LT |
674 | |
675 | static DEFINE_SPINLOCK(part_parser_lock); | |
676 | static LIST_HEAD(part_parsers); | |
677 | ||
678 | static struct mtd_part_parser *get_partition_parser(const char *name) | |
679 | { | |
71a928c0 | 680 | struct mtd_part_parser *p, *ret = NULL; |
1da177e4 | 681 | |
71a928c0 | 682 | spin_lock(&part_parser_lock); |
1da177e4 | 683 | |
71a928c0 | 684 | list_for_each_entry(p, &part_parsers, list) |
1da177e4 LT |
685 | if (!strcmp(p->name, name) && try_module_get(p->owner)) { |
686 | ret = p; | |
687 | break; | |
688 | } | |
71a928c0 | 689 | |
1da177e4 LT |
690 | spin_unlock(&part_parser_lock); |
691 | ||
692 | return ret; | |
693 | } | |
694 | ||
953b3bd1 DES |
695 | #define put_partition_parser(p) do { module_put((p)->owner); } while (0) |
696 | ||
1da177e4 LT |
697 | int register_mtd_parser(struct mtd_part_parser *p) |
698 | { | |
699 | spin_lock(&part_parser_lock); | |
700 | list_add(&p->list, &part_parsers); | |
701 | spin_unlock(&part_parser_lock); | |
702 | ||
703 | return 0; | |
704 | } | |
b33a2887 | 705 | EXPORT_SYMBOL_GPL(register_mtd_parser); |
1da177e4 LT |
706 | |
707 | int deregister_mtd_parser(struct mtd_part_parser *p) | |
708 | { | |
709 | spin_lock(&part_parser_lock); | |
710 | list_del(&p->list); | |
711 | spin_unlock(&part_parser_lock); | |
712 | return 0; | |
713 | } | |
b33a2887 | 714 | EXPORT_SYMBOL_GPL(deregister_mtd_parser); |
1da177e4 | 715 | |
ad274cec AB |
716 | /* |
717 | * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you | |
718 | * are changing this array! | |
719 | */ | |
ccef4dcc | 720 | static const char * const default_mtd_part_types[] = { |
d26c87d6 DES |
721 | "cmdlinepart", |
722 | "ofpart", | |
723 | NULL | |
724 | }; | |
5c4eefbd | 725 | |
ad274cec AB |
726 | /** |
727 | * parse_mtd_partitions - parse MTD partitions | |
728 | * @master: the master partition (describes whole MTD device) | |
729 | * @types: names of partition parsers to try or %NULL | |
730 | * @pparts: array of partitions found is returned here | |
c7975330 | 731 | * @data: MTD partition parser-specific data |
ad274cec AB |
732 | * |
733 | * This function tries to find partition on MTD device @master. It uses MTD | |
734 | * partition parsers, specified in @types. However, if @types is %NULL, then | |
735 | * the default list of parsers is used. The default list contains only the | |
d26c87d6 | 736 | * "cmdlinepart" and "ofpart" parsers ATM. |
c51803dd HS |
737 | * Note: If there are more then one parser in @types, the kernel only takes the |
738 | * partitions parsed out by the first parser. | |
ad274cec AB |
739 | * |
740 | * This function may return: | |
741 | * o a negative error code in case of failure | |
742 | * o zero if no partitions were found | |
743 | * o a positive number of found partitions, in which case on exit @pparts will | |
744 | * point to an array containing this number of &struct mtd_info objects. | |
745 | */ | |
26a47346 | 746 | int parse_mtd_partitions(struct mtd_info *master, const char *const *types, |
c7975330 DES |
747 | struct mtd_partition **pparts, |
748 | struct mtd_part_parser_data *data) | |
1da177e4 LT |
749 | { |
750 | struct mtd_part_parser *parser; | |
751 | int ret = 0; | |
97894cda | 752 | |
5c4eefbd DES |
753 | if (!types) |
754 | types = default_mtd_part_types; | |
755 | ||
1da177e4 LT |
756 | for ( ; ret <= 0 && *types; types++) { |
757 | parser = get_partition_parser(*types); | |
1da177e4 | 758 | if (!parser && !request_module("%s", *types)) |
58edc904 | 759 | parser = get_partition_parser(*types); |
7c802fbd | 760 | if (!parser) |
1da177e4 | 761 | continue; |
c7975330 | 762 | ret = (*parser->parse_fn)(master, pparts, data); |
c51803dd | 763 | put_partition_parser(parser); |
1da177e4 | 764 | if (ret > 0) { |
97894cda | 765 | printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n", |
1da177e4 | 766 | ret, parser->name, master->name); |
c51803dd | 767 | break; |
1da177e4 | 768 | } |
1da177e4 LT |
769 | } |
770 | return ret; | |
771 | } | |
5daa7b21 | 772 | |
5dee4674 | 773 | int mtd_is_partition(const struct mtd_info *mtd) |
5daa7b21 RT |
774 | { |
775 | struct mtd_part *part; | |
a7e93dcd | 776 | int ispart = 0; |
5daa7b21 RT |
777 | |
778 | mutex_lock(&mtd_partitions_mutex); | |
779 | list_for_each_entry(part, &mtd_partitions, list) | |
780 | if (&part->mtd == mtd) { | |
a7e93dcd | 781 | ispart = 1; |
5daa7b21 RT |
782 | break; |
783 | } | |
784 | mutex_unlock(&mtd_partitions_mutex); | |
785 | ||
a7e93dcd | 786 | return ispart; |
5daa7b21 | 787 | } |
a7e93dcd | 788 | EXPORT_SYMBOL_GPL(mtd_is_partition); |
62082e56 | 789 | |
6fa3eb70 S |
790 | #ifdef CONFIG_MTK_MTD_NAND |
791 | u64 mtd_partition_start_address(struct mtd_info *mtd) | |
792 | { | |
793 | struct mtd_part *part = PART(mtd); | |
794 | return part->offset; | |
795 | } | |
796 | EXPORT_SYMBOL_GPL(mtd_partition_start_address); | |
797 | #endif | |
798 | ||
62082e56 RG |
799 | /* Returns the size of the entire flash chip */ |
800 | uint64_t mtd_get_device_size(const struct mtd_info *mtd) | |
801 | { | |
802 | if (!mtd_is_partition(mtd)) | |
803 | return mtd->size; | |
804 | ||
805 | return PART(mtd)->master->size; | |
806 | } | |
807 | EXPORT_SYMBOL_GPL(mtd_get_device_size); | |
6fa3eb70 S |
808 | |
809 | #ifdef DYNAMIC_CHANGE_MTD_WRITEABLE //wschen 2011-01-05 | |
810 | int mtd_writeable_proc_write(struct file *file, const char *buffer, unsigned long count, void *data) | |
811 | { | |
812 | char buf[3]; | |
813 | ||
814 | if (count != 3) { | |
815 | return -EFAULT; | |
816 | } | |
817 | ||
818 | if (copy_from_user(buf, buffer, 3)) { | |
819 | return -EFAULT; | |
820 | } | |
821 | ||
822 | if ((buf[0] != 0) || (buf[1] != 0) || (buf[2] != 0)) { | |
823 | return -EFAULT; | |
824 | } | |
825 | ||
826 | if (my_mtd) { | |
827 | ||
828 | struct mtd_part *slave, *next; | |
829 | ||
830 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) | |
831 | if (slave->master == my_mtd) { | |
832 | slave->mtd.flags |= MTD_WRITEABLE; | |
833 | } | |
834 | } | |
835 | ||
836 | return count; | |
837 | } | |
838 | ||
839 | #define MTD_CHANGE_NUM 4 | |
840 | int mtd_change_proc_write(struct file *file, const char *buffer, unsigned long count, void *data) | |
841 | { | |
842 | struct mtd_change mtd_change[MTD_CHANGE_NUM]; | |
843 | int write_3 = 0; | |
844 | ||
845 | if (count == (sizeof(struct mtd_change) * (MTD_CHANGE_NUM - 1))) { | |
846 | write_3 = 1; | |
847 | } else if (count != (sizeof(struct mtd_change) * MTD_CHANGE_NUM)) { | |
848 | return -EFAULT; | |
849 | } | |
850 | ||
851 | if (copy_from_user(mtd_change, buffer, count)) { | |
852 | return -EFAULT; | |
853 | } | |
854 | ||
855 | if (my_mtd) { | |
856 | struct mtd_part *slave, *next; | |
857 | ||
858 | list_for_each_entry_safe(slave, next, &mtd_partitions, list) | |
859 | if (slave->master == my_mtd) { | |
860 | if (write_3 == 1) { | |
861 | if (strncmp(slave->mtd.name, "system", strlen(slave->mtd.name)) == 0) { | |
862 | slave->mtd.size = mtd_change[0].size; | |
863 | slave->offset = mtd_change[0].offset; | |
864 | } else if (strncmp(slave->mtd.name, "cache", strlen(slave->mtd.name)) == 0) { | |
865 | slave->mtd.size = mtd_change[1].size; | |
866 | slave->offset = mtd_change[1].offset; | |
867 | } else if (strncmp(slave->mtd.name, "userdata", strlen(slave->mtd.name)) == 0) { | |
868 | slave->mtd.size = mtd_change[2].size; | |
869 | slave->offset = mtd_change[2].offset; | |
870 | } | |
871 | } else { | |
872 | //4 arguments | |
873 | if (strncmp(slave->mtd.name, "expdb", strlen(slave->mtd.name)) == 0) { | |
874 | slave->mtd.size = mtd_change[0].size; | |
875 | slave->offset = mtd_change[0].offset; | |
876 | } else if (strncmp(slave->mtd.name, "system", strlen(slave->mtd.name)) == 0) { | |
877 | slave->mtd.size = mtd_change[1].size; | |
878 | slave->offset = mtd_change[1].offset; | |
879 | } else if (strncmp(slave->mtd.name, "cache", strlen(slave->mtd.name)) == 0) { | |
880 | slave->mtd.size = mtd_change[2].size; | |
881 | slave->offset = mtd_change[2].offset; | |
882 | } else if (strncmp(slave->mtd.name, "userdata", strlen(slave->mtd.name)) == 0) { | |
883 | slave->mtd.size = mtd_change[3].size; | |
884 | slave->offset = mtd_change[3].offset; | |
885 | } | |
886 | } | |
887 | } | |
888 | } | |
889 | ||
890 | return count; | |
891 | } | |
892 | #endif |