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12#include <common.h>
13#include <malloc.h>
14#include <asm/errno.h>
15
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>
21
22
23struct list_head mtd_partitions;
24
25
26struct mtd_part {
27 struct mtd_info mtd;
28 struct mtd_info *master;
29 uint64_t offset;
30 int index;
31 struct list_head list;
32 int registered;
33};
34
35
36
37
38
39#define PART(x) ((struct mtd_part *)(x))
40
41
42
43
44
45
46
47static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
48 size_t *retlen, u_char *buf)
49{
50 struct mtd_part *part = PART(mtd);
51 struct mtd_ecc_stats stats;
52 int res;
53
54 stats = part->master->ecc_stats;
55
56 if (from >= mtd->size)
57 len = 0;
58 else if (from + len > mtd->size)
59 len = mtd->size - from;
60 res = part->master->read(part->master, from + part->offset,
61 len, retlen, buf);
62 if (unlikely(res)) {
63 if (res == -EUCLEAN)
64 mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected;
65 if (res == -EBADMSG)
66 mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed;
67 }
68 return res;
69}
70
71static int part_read_oob(struct mtd_info *mtd, loff_t from,
72 struct mtd_oob_ops *ops)
73{
74 struct mtd_part *part = PART(mtd);
75 int res;
76
77 if (from >= mtd->size)
78 return -EINVAL;
79 if (ops->datbuf && from + ops->len > mtd->size)
80 return -EINVAL;
81 res = part->master->read_oob(part->master, from + part->offset, ops);
82
83 if (unlikely(res)) {
84 if (res == -EUCLEAN)
85 mtd->ecc_stats.corrected++;
86 if (res == -EBADMSG)
87 mtd->ecc_stats.failed++;
88 }
89 return res;
90}
91
92static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
93 size_t len, size_t *retlen, u_char *buf)
94{
95 struct mtd_part *part = PART(mtd);
96 return part->master->read_user_prot_reg(part->master, from,
97 len, retlen, buf);
98}
99
100static int part_get_user_prot_info(struct mtd_info *mtd,
101 struct otp_info *buf, size_t len)
102{
103 struct mtd_part *part = PART(mtd);
104 return part->master->get_user_prot_info(part->master, buf, len);
105}
106
107static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
108 size_t len, size_t *retlen, u_char *buf)
109{
110 struct mtd_part *part = PART(mtd);
111 return part->master->read_fact_prot_reg(part->master, from,
112 len, retlen, buf);
113}
114
115static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
116 size_t len)
117{
118 struct mtd_part *part = PART(mtd);
119 return part->master->get_fact_prot_info(part->master, buf, len);
120}
121
122static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
123 size_t *retlen, const u_char *buf)
124{
125 struct mtd_part *part = PART(mtd);
126 if (!(mtd->flags & MTD_WRITEABLE))
127 return -EROFS;
128 if (to >= mtd->size)
129 len = 0;
130 else if (to + len > mtd->size)
131 len = mtd->size - to;
132 return part->master->write(part->master, to + part->offset,
133 len, retlen, buf);
134}
135
136static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
137 size_t *retlen, const u_char *buf)
138{
139 struct mtd_part *part = PART(mtd);
140 if (!(mtd->flags & MTD_WRITEABLE))
141 return -EROFS;
142 if (to >= mtd->size)
143 len = 0;
144 else if (to + len > mtd->size)
145 len = mtd->size - to;
146 return part->master->panic_write(part->master, to + part->offset,
147 len, retlen, buf);
148}
149
150static int part_write_oob(struct mtd_info *mtd, loff_t to,
151 struct mtd_oob_ops *ops)
152{
153 struct mtd_part *part = PART(mtd);
154
155 if (!(mtd->flags & MTD_WRITEABLE))
156 return -EROFS;
157
158 if (to >= mtd->size)
159 return -EINVAL;
160 if (ops->datbuf && to + ops->len > mtd->size)
161 return -EINVAL;
162 return part->master->write_oob(part->master, to + part->offset, ops);
163}
164
165static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
166 size_t len, size_t *retlen, u_char *buf)
167{
168 struct mtd_part *part = PART(mtd);
169 return part->master->write_user_prot_reg(part->master, from,
170 len, retlen, buf);
171}
172
173static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
174 size_t len)
175{
176 struct mtd_part *part = PART(mtd);
177 return part->master->lock_user_prot_reg(part->master, from, len);
178}
179
180static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
181{
182 struct mtd_part *part = PART(mtd);
183 int ret;
184 if (!(mtd->flags & MTD_WRITEABLE))
185 return -EROFS;
186 if (instr->addr >= mtd->size)
187 return -EINVAL;
188 instr->addr += part->offset;
189 ret = part->master->erase(part->master, instr);
190 if (ret) {
191 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
192 instr->fail_addr -= part->offset;
193 instr->addr -= part->offset;
194 }
195 return ret;
196}
197
198void mtd_erase_callback(struct erase_info *instr)
199{
200 if (instr->mtd->erase == part_erase) {
201 struct mtd_part *part = PART(instr->mtd);
202
203 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
204 instr->fail_addr -= part->offset;
205 instr->addr -= part->offset;
206 }
207 if (instr->callback)
208 instr->callback(instr);
209}
210
211static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
212{
213 struct mtd_part *part = PART(mtd);
214 if ((len + ofs) > mtd->size)
215 return -EINVAL;
216 return part->master->lock(part->master, ofs + part->offset, len);
217}
218
219static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
220{
221 struct mtd_part *part = PART(mtd);
222 if ((len + ofs) > mtd->size)
223 return -EINVAL;
224 return part->master->unlock(part->master, ofs + part->offset, len);
225}
226
227static void part_sync(struct mtd_info *mtd)
228{
229 struct mtd_part *part = PART(mtd);
230 part->master->sync(part->master);
231}
232
233static int part_suspend(struct mtd_info *mtd)
234{
235 struct mtd_part *part = PART(mtd);
236 return part->master->suspend(part->master);
237}
238
239static void part_resume(struct mtd_info *mtd)
240{
241 struct mtd_part *part = PART(mtd);
242 part->master->resume(part->master);
243}
244
245static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
246{
247 struct mtd_part *part = PART(mtd);
248 if (ofs >= mtd->size)
249 return -EINVAL;
250 ofs += part->offset;
251 return part->master->block_isbad(part->master, ofs);
252}
253
254static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
255{
256 struct mtd_part *part = PART(mtd);
257 int res;
258
259 if (!(mtd->flags & MTD_WRITEABLE))
260 return -EROFS;
261 if (ofs >= mtd->size)
262 return -EINVAL;
263 ofs += part->offset;
264 res = part->master->block_markbad(part->master, ofs);
265 if (!res)
266 mtd->ecc_stats.badblocks++;
267 return res;
268}
269
270
271
272
273
274
275int del_mtd_partitions(struct mtd_info *master)
276{
277 struct mtd_part *slave, *next;
278
279 list_for_each_entry_safe(slave, next, &mtd_partitions, list)
280 if (slave->master == master) {
281 list_del(&slave->list);
282 if (slave->registered)
283 del_mtd_device(&slave->mtd);
284 kfree(slave);
285 }
286
287 return 0;
288}
289
290static struct mtd_part *add_one_partition(struct mtd_info *master,
291 const struct mtd_partition *part, int partno,
292 uint64_t cur_offset)
293{
294 struct mtd_part *slave;
295
296
297 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
298 if (!slave) {
299 printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
300 master->name);
301 del_mtd_partitions(master);
302 return NULL;
303 }
304 list_add(&slave->list, &mtd_partitions);
305
306
307 slave->mtd.type = master->type;
308 slave->mtd.flags = master->flags & ~part->mask_flags;
309 slave->mtd.size = part->size;
310 slave->mtd.writesize = master->writesize;
311 slave->mtd.oobsize = master->oobsize;
312 slave->mtd.oobavail = master->oobavail;
313 slave->mtd.subpage_sft = master->subpage_sft;
314
315 slave->mtd.name = part->name;
316 slave->mtd.owner = master->owner;
317
318 slave->mtd.read = part_read;
319 slave->mtd.write = part_write;
320
321 if (master->panic_write)
322 slave->mtd.panic_write = part_panic_write;
323
324 if (master->read_oob)
325 slave->mtd.read_oob = part_read_oob;
326 if (master->write_oob)
327 slave->mtd.write_oob = part_write_oob;
328 if (master->read_user_prot_reg)
329 slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
330 if (master->read_fact_prot_reg)
331 slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
332 if (master->write_user_prot_reg)
333 slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
334 if (master->lock_user_prot_reg)
335 slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
336 if (master->get_user_prot_info)
337 slave->mtd.get_user_prot_info = part_get_user_prot_info;
338 if (master->get_fact_prot_info)
339 slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
340 if (master->sync)
341 slave->mtd.sync = part_sync;
342 if (!partno && master->suspend && master->resume) {
343 slave->mtd.suspend = part_suspend;
344 slave->mtd.resume = part_resume;
345 }
346 if (master->lock)
347 slave->mtd.lock = part_lock;
348 if (master->unlock)
349 slave->mtd.unlock = part_unlock;
350 if (master->block_isbad)
351 slave->mtd.block_isbad = part_block_isbad;
352 if (master->block_markbad)
353 slave->mtd.block_markbad = part_block_markbad;
354 slave->mtd.erase = part_erase;
355 slave->master = master;
356 slave->offset = part->offset;
357 slave->index = partno;
358
359 if (slave->offset == MTDPART_OFS_APPEND)
360 slave->offset = cur_offset;
361 if (slave->offset == MTDPART_OFS_NXTBLK) {
362 slave->offset = cur_offset;
363 if (mtd_mod_by_eb(cur_offset, master) != 0) {
364
365 slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
366 printk(KERN_NOTICE "Moving partition %d: "
367 "0x%012llx -> 0x%012llx\n", partno,
368 (unsigned long long)cur_offset, (unsigned long long)slave->offset);
369 }
370 }
371 if (slave->mtd.size == MTDPART_SIZ_FULL)
372 slave->mtd.size = master->size - slave->offset;
373
374 printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
375 (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
376
377
378 if (slave->offset >= master->size) {
379
380 slave->offset = 0;
381 slave->mtd.size = 0;
382 printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
383 part->name);
384 goto out_register;
385 }
386 if (slave->offset + slave->mtd.size > master->size) {
387 slave->mtd.size = master->size - slave->offset;
388 printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
389 part->name, master->name, (unsigned long long)slave->mtd.size);
390 }
391 if (master->numeraseregions > 1) {
392
393 int i, max = master->numeraseregions;
394 u64 end = slave->offset + slave->mtd.size;
395 struct mtd_erase_region_info *regions = master->eraseregions;
396
397
398
399 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
400 ;
401
402 i--;
403
404
405 for (; i < max && regions[i].offset < end; i++) {
406 if (slave->mtd.erasesize < regions[i].erasesize) {
407 slave->mtd.erasesize = regions[i].erasesize;
408 }
409 }
410 BUG_ON(slave->mtd.erasesize == 0);
411 } else {
412
413 slave->mtd.erasesize = master->erasesize;
414 }
415
416 if ((slave->mtd.flags & MTD_WRITEABLE) &&
417 mtd_mod_by_eb(slave->offset, &slave->mtd)) {
418
419
420
421 slave->mtd.flags &= ~MTD_WRITEABLE;
422 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
423 part->name);
424 }
425 if ((slave->mtd.flags & MTD_WRITEABLE) &&
426 mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
427 slave->mtd.flags &= ~MTD_WRITEABLE;
428 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
429 part->name);
430 }
431
432 slave->mtd.ecclayout = master->ecclayout;
433 if (master->block_isbad) {
434 uint64_t offs = 0;
435
436 while (offs < slave->mtd.size) {
437 if (master->block_isbad(master,
438 offs + slave->offset))
439 slave->mtd.ecc_stats.badblocks++;
440 offs += slave->mtd.erasesize;
441 }
442 }
443
444out_register:
445 if (part->mtdp) {
446
447 *part->mtdp = &slave->mtd;
448 slave->registered = 0;
449 } else {
450
451 add_mtd_device(&slave->mtd);
452 slave->registered = 1;
453 }
454 return slave;
455}
456
457
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460
461
462
463
464
465
466int add_mtd_partitions(struct mtd_info *master,
467 const struct mtd_partition *parts,
468 int nbparts)
469{
470 struct mtd_part *slave;
471 uint64_t cur_offset = 0;
472 int i;
473
474
475
476
477
478
479 if (mtd_partitions.next == NULL)
480 INIT_LIST_HEAD(&mtd_partitions);
481
482 printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
483
484 for (i = 0; i < nbparts; i++) {
485 slave = add_one_partition(master, parts + i, i, cur_offset);
486 if (!slave)
487 return -ENOMEM;
488 cur_offset = slave->offset + slave->mtd.size;
489 }
490
491 return 0;
492}
493