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Commit | Line | Data |
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e29c22f5 KP |
1 | /* |
2 | * Core registration and callback routines for MTD | |
3 | * drivers and users. | |
4 | * | |
ff94bc40 HS |
5 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
6 | * Copyright © 2006 Red Hat UK Limited | |
7 | * | |
8 | * SPDX-License-Identifier: GPL-2.0+ | |
9 | * | |
e29c22f5 KP |
10 | */ |
11 | ||
ff94bc40 HS |
12 | #ifndef __UBOOT__ |
13 | #include <linux/module.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/ptrace.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/timer.h> | |
19 | #include <linux/major.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/ioctl.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/proc_fs.h> | |
25 | #include <linux/idr.h> | |
26 | #include <linux/backing-dev.h> | |
27 | #include <linux/gfp.h> | |
28 | #include <linux/slab.h> | |
29 | #else | |
ff94bc40 | 30 | #include <linux/err.h> |
e29c22f5 | 31 | #include <ubi_uboot.h> |
ff94bc40 HS |
32 | #endif |
33 | ||
f8fdb81f | 34 | #include <linux/log2.h> |
ff94bc40 HS |
35 | #include <linux/mtd/mtd.h> |
36 | #include <linux/mtd/partitions.h> | |
37 | ||
38 | #include "mtdcore.h" | |
39 | ||
40 | #ifndef __UBOOT__ | |
41 | /* | |
42 | * backing device capabilities for non-mappable devices (such as NAND flash) | |
43 | * - permits private mappings, copies are taken of the data | |
44 | */ | |
45 | static struct backing_dev_info mtd_bdi_unmappable = { | |
46 | .capabilities = BDI_CAP_MAP_COPY, | |
47 | }; | |
48 | ||
49 | /* | |
50 | * backing device capabilities for R/O mappable devices (such as ROM) | |
51 | * - permits private mappings, copies are taken of the data | |
52 | * - permits non-writable shared mappings | |
53 | */ | |
54 | static struct backing_dev_info mtd_bdi_ro_mappable = { | |
55 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | | |
56 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP), | |
57 | }; | |
58 | ||
59 | /* | |
60 | * backing device capabilities for writable mappable devices (such as RAM) | |
61 | * - permits private mappings, copies are taken of the data | |
62 | * - permits non-writable shared mappings | |
63 | */ | |
64 | static struct backing_dev_info mtd_bdi_rw_mappable = { | |
65 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | | |
66 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | | |
67 | BDI_CAP_WRITE_MAP), | |
68 | }; | |
69 | ||
70 | static int mtd_cls_suspend(struct device *dev, pm_message_t state); | |
71 | static int mtd_cls_resume(struct device *dev); | |
e29c22f5 | 72 | |
ff94bc40 HS |
73 | static struct class mtd_class = { |
74 | .name = "mtd", | |
75 | .owner = THIS_MODULE, | |
76 | .suspend = mtd_cls_suspend, | |
77 | .resume = mtd_cls_resume, | |
78 | }; | |
79 | #else | |
e29c22f5 KP |
80 | struct mtd_info *mtd_table[MAX_MTD_DEVICES]; |
81 | ||
ff94bc40 HS |
82 | #define MAX_IDR_ID 64 |
83 | ||
84 | struct idr_layer { | |
85 | int used; | |
86 | void *ptr; | |
87 | }; | |
88 | ||
89 | struct idr { | |
90 | struct idr_layer id[MAX_IDR_ID]; | |
91 | }; | |
92 | ||
93 | #define DEFINE_IDR(name) struct idr name; | |
94 | ||
95 | void idr_remove(struct idr *idp, int id) | |
96 | { | |
97 | if (idp->id[id].used) | |
98 | idp->id[id].used = 0; | |
99 | ||
100 | return; | |
101 | } | |
102 | void *idr_find(struct idr *idp, int id) | |
103 | { | |
104 | if (idp->id[id].used) | |
105 | return idp->id[id].ptr; | |
106 | ||
107 | return NULL; | |
108 | } | |
109 | ||
110 | void *idr_get_next(struct idr *idp, int *next) | |
111 | { | |
112 | void *ret; | |
113 | int id = *next; | |
114 | ||
115 | ret = idr_find(idp, id); | |
116 | if (ret) { | |
117 | id ++; | |
118 | if (!idp->id[id].used) | |
119 | id = 0; | |
120 | *next = id; | |
121 | } else { | |
122 | *next = 0; | |
123 | } | |
124 | ||
125 | return ret; | |
126 | } | |
127 | ||
128 | int idr_alloc(struct idr *idp, void *ptr, int start, int end, gfp_t gfp_mask) | |
129 | { | |
130 | struct idr_layer *idl; | |
131 | int i = 0; | |
132 | ||
133 | while (i < MAX_IDR_ID) { | |
134 | idl = &idp->id[i]; | |
135 | if (idl->used == 0) { | |
136 | idl->used = 1; | |
137 | idl->ptr = ptr; | |
138 | return i; | |
139 | } | |
140 | i++; | |
141 | } | |
142 | return -ENOSPC; | |
143 | } | |
144 | #endif | |
145 | ||
146 | static DEFINE_IDR(mtd_idr); | |
147 | ||
148 | /* These are exported solely for the purpose of mtd_blkdevs.c. You | |
149 | should not use them for _anything_ else */ | |
150 | DEFINE_MUTEX(mtd_table_mutex); | |
151 | EXPORT_SYMBOL_GPL(mtd_table_mutex); | |
152 | ||
153 | struct mtd_info *__mtd_next_device(int i) | |
154 | { | |
155 | return idr_get_next(&mtd_idr, &i); | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(__mtd_next_device); | |
158 | ||
159 | #ifndef __UBOOT__ | |
160 | static LIST_HEAD(mtd_notifiers); | |
161 | ||
162 | ||
163 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) | |
164 | ||
165 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
166 | * the mtd_info will probably want to use the release() hook... | |
167 | */ | |
168 | static void mtd_release(struct device *dev) | |
169 | { | |
170 | struct mtd_info __maybe_unused *mtd = dev_get_drvdata(dev); | |
171 | dev_t index = MTD_DEVT(mtd->index); | |
172 | ||
173 | /* remove /dev/mtdXro node if needed */ | |
174 | if (index) | |
175 | device_destroy(&mtd_class, index + 1); | |
176 | } | |
177 | ||
178 | static int mtd_cls_suspend(struct device *dev, pm_message_t state) | |
179 | { | |
180 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
181 | ||
182 | return mtd ? mtd_suspend(mtd) : 0; | |
183 | } | |
184 | ||
185 | static int mtd_cls_resume(struct device *dev) | |
186 | { | |
187 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
188 | ||
189 | if (mtd) | |
190 | mtd_resume(mtd); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static ssize_t mtd_type_show(struct device *dev, | |
195 | struct device_attribute *attr, char *buf) | |
196 | { | |
197 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
198 | char *type; | |
199 | ||
200 | switch (mtd->type) { | |
201 | case MTD_ABSENT: | |
202 | type = "absent"; | |
203 | break; | |
204 | case MTD_RAM: | |
205 | type = "ram"; | |
206 | break; | |
207 | case MTD_ROM: | |
208 | type = "rom"; | |
209 | break; | |
210 | case MTD_NORFLASH: | |
211 | type = "nor"; | |
212 | break; | |
213 | case MTD_NANDFLASH: | |
214 | type = "nand"; | |
215 | break; | |
216 | case MTD_DATAFLASH: | |
217 | type = "dataflash"; | |
218 | break; | |
219 | case MTD_UBIVOLUME: | |
220 | type = "ubi"; | |
221 | break; | |
222 | case MTD_MLCNANDFLASH: | |
223 | type = "mlc-nand"; | |
224 | break; | |
225 | default: | |
226 | type = "unknown"; | |
227 | } | |
228 | ||
229 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
230 | } | |
231 | static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); | |
232 | ||
233 | static ssize_t mtd_flags_show(struct device *dev, | |
234 | struct device_attribute *attr, char *buf) | |
235 | { | |
236 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
237 | ||
238 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); | |
239 | ||
240 | } | |
241 | static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); | |
242 | ||
243 | static ssize_t mtd_size_show(struct device *dev, | |
244 | struct device_attribute *attr, char *buf) | |
245 | { | |
246 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
247 | ||
248 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
249 | (unsigned long long)mtd->size); | |
250 | ||
251 | } | |
252 | static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); | |
253 | ||
254 | static ssize_t mtd_erasesize_show(struct device *dev, | |
255 | struct device_attribute *attr, char *buf) | |
256 | { | |
257 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
258 | ||
259 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); | |
260 | ||
261 | } | |
262 | static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); | |
263 | ||
264 | static ssize_t mtd_writesize_show(struct device *dev, | |
265 | struct device_attribute *attr, char *buf) | |
266 | { | |
267 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
268 | ||
269 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); | |
270 | ||
271 | } | |
272 | static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); | |
273 | ||
274 | static ssize_t mtd_subpagesize_show(struct device *dev, | |
275 | struct device_attribute *attr, char *buf) | |
276 | { | |
277 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
278 | unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; | |
279 | ||
280 | return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); | |
281 | ||
282 | } | |
283 | static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); | |
284 | ||
285 | static ssize_t mtd_oobsize_show(struct device *dev, | |
286 | struct device_attribute *attr, char *buf) | |
287 | { | |
288 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
289 | ||
290 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); | |
291 | ||
292 | } | |
293 | static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); | |
294 | ||
295 | static ssize_t mtd_numeraseregions_show(struct device *dev, | |
296 | struct device_attribute *attr, char *buf) | |
297 | { | |
298 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
299 | ||
300 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); | |
301 | ||
302 | } | |
303 | static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, | |
304 | NULL); | |
305 | ||
306 | static ssize_t mtd_name_show(struct device *dev, | |
307 | struct device_attribute *attr, char *buf) | |
308 | { | |
309 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
310 | ||
311 | return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); | |
312 | ||
313 | } | |
314 | static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); | |
315 | ||
316 | static ssize_t mtd_ecc_strength_show(struct device *dev, | |
317 | struct device_attribute *attr, char *buf) | |
318 | { | |
319 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
320 | ||
321 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength); | |
322 | } | |
323 | static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL); | |
324 | ||
325 | static ssize_t mtd_bitflip_threshold_show(struct device *dev, | |
326 | struct device_attribute *attr, | |
327 | char *buf) | |
328 | { | |
329 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
330 | ||
331 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->bitflip_threshold); | |
332 | } | |
333 | ||
334 | static ssize_t mtd_bitflip_threshold_store(struct device *dev, | |
335 | struct device_attribute *attr, | |
336 | const char *buf, size_t count) | |
337 | { | |
338 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
339 | unsigned int bitflip_threshold; | |
340 | int retval; | |
341 | ||
342 | retval = kstrtouint(buf, 0, &bitflip_threshold); | |
343 | if (retval) | |
344 | return retval; | |
345 | ||
346 | mtd->bitflip_threshold = bitflip_threshold; | |
347 | return count; | |
348 | } | |
349 | static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR, | |
350 | mtd_bitflip_threshold_show, | |
351 | mtd_bitflip_threshold_store); | |
352 | ||
353 | static ssize_t mtd_ecc_step_size_show(struct device *dev, | |
354 | struct device_attribute *attr, char *buf) | |
355 | { | |
356 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
357 | ||
358 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_step_size); | |
359 | ||
360 | } | |
361 | static DEVICE_ATTR(ecc_step_size, S_IRUGO, mtd_ecc_step_size_show, NULL); | |
362 | ||
363 | static struct attribute *mtd_attrs[] = { | |
364 | &dev_attr_type.attr, | |
365 | &dev_attr_flags.attr, | |
366 | &dev_attr_size.attr, | |
367 | &dev_attr_erasesize.attr, | |
368 | &dev_attr_writesize.attr, | |
369 | &dev_attr_subpagesize.attr, | |
370 | &dev_attr_oobsize.attr, | |
371 | &dev_attr_numeraseregions.attr, | |
372 | &dev_attr_name.attr, | |
373 | &dev_attr_ecc_strength.attr, | |
374 | &dev_attr_ecc_step_size.attr, | |
375 | &dev_attr_bitflip_threshold.attr, | |
376 | NULL, | |
377 | }; | |
378 | ATTRIBUTE_GROUPS(mtd); | |
379 | ||
380 | static struct device_type mtd_devtype = { | |
381 | .name = "mtd", | |
382 | .groups = mtd_groups, | |
383 | .release = mtd_release, | |
384 | }; | |
385 | #endif | |
386 | ||
387 | /** | |
388 | * add_mtd_device - register an MTD device | |
389 | * @mtd: pointer to new MTD device info structure | |
390 | * | |
391 | * Add a device to the list of MTD devices present in the system, and | |
392 | * notify each currently active MTD 'user' of its arrival. Returns | |
393 | * zero on success or 1 on failure, which currently will only happen | |
394 | * if there is insufficient memory or a sysfs error. | |
395 | */ | |
396 | ||
e29c22f5 KP |
397 | int add_mtd_device(struct mtd_info *mtd) |
398 | { | |
ff94bc40 HS |
399 | #ifndef __UBOOT__ |
400 | struct mtd_notifier *not; | |
401 | #endif | |
402 | int i, error; | |
403 | ||
404 | #ifndef __UBOOT__ | |
405 | if (!mtd->backing_dev_info) { | |
406 | switch (mtd->type) { | |
407 | case MTD_RAM: | |
408 | mtd->backing_dev_info = &mtd_bdi_rw_mappable; | |
409 | break; | |
410 | case MTD_ROM: | |
411 | mtd->backing_dev_info = &mtd_bdi_ro_mappable; | |
412 | break; | |
413 | default: | |
414 | mtd->backing_dev_info = &mtd_bdi_unmappable; | |
415 | break; | |
416 | } | |
417 | } | |
418 | #endif | |
e29c22f5 KP |
419 | |
420 | BUG_ON(mtd->writesize == 0); | |
ff94bc40 | 421 | mutex_lock(&mtd_table_mutex); |
e29c22f5 | 422 | |
ff94bc40 HS |
423 | i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); |
424 | if (i < 0) | |
425 | goto fail_locked; | |
e29c22f5 | 426 | |
ff94bc40 HS |
427 | mtd->index = i; |
428 | mtd->usecount = 0; | |
dfe64e2c | 429 | |
ff94bc40 HS |
430 | /* default value if not set by driver */ |
431 | if (mtd->bitflip_threshold == 0) | |
432 | mtd->bitflip_threshold = mtd->ecc_strength; | |
dfe64e2c | 433 | |
ff94bc40 HS |
434 | if (is_power_of_2(mtd->erasesize)) |
435 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; | |
436 | else | |
437 | mtd->erasesize_shift = 0; | |
e29c22f5 | 438 | |
ff94bc40 HS |
439 | if (is_power_of_2(mtd->writesize)) |
440 | mtd->writesize_shift = ffs(mtd->writesize) - 1; | |
441 | else | |
442 | mtd->writesize_shift = 0; | |
443 | ||
444 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; | |
445 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; | |
446 | ||
447 | /* Some chips always power up locked. Unlock them now */ | |
448 | if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { | |
449 | error = mtd_unlock(mtd, 0, mtd->size); | |
450 | if (error && error != -EOPNOTSUPP) | |
451 | printk(KERN_WARNING | |
452 | "%s: unlock failed, writes may not work\n", | |
453 | mtd->name); | |
454 | } | |
455 | ||
456 | #ifndef __UBOOT__ | |
457 | /* Caller should have set dev.parent to match the | |
458 | * physical device. | |
459 | */ | |
460 | mtd->dev.type = &mtd_devtype; | |
461 | mtd->dev.class = &mtd_class; | |
462 | mtd->dev.devt = MTD_DEVT(i); | |
463 | dev_set_name(&mtd->dev, "mtd%d", i); | |
464 | dev_set_drvdata(&mtd->dev, mtd); | |
465 | if (device_register(&mtd->dev) != 0) | |
466 | goto fail_added; | |
e29c22f5 | 467 | |
ff94bc40 HS |
468 | if (MTD_DEVT(i)) |
469 | device_create(&mtd_class, mtd->dev.parent, | |
470 | MTD_DEVT(i) + 1, | |
471 | NULL, "mtd%dro", i); | |
472 | ||
473 | pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); | |
474 | /* No need to get a refcount on the module containing | |
475 | the notifier, since we hold the mtd_table_mutex */ | |
476 | list_for_each_entry(not, &mtd_notifiers, list) | |
477 | not->add(mtd); | |
ddf7bcfa HS |
478 | #else |
479 | pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); | |
ff94bc40 HS |
480 | #endif |
481 | ||
482 | mutex_unlock(&mtd_table_mutex); | |
483 | /* We _know_ we aren't being removed, because | |
484 | our caller is still holding us here. So none | |
485 | of this try_ nonsense, and no bitching about it | |
486 | either. :) */ | |
487 | __module_get(THIS_MODULE); | |
488 | return 0; | |
489 | ||
490 | #ifndef __UBOOT__ | |
491 | fail_added: | |
492 | idr_remove(&mtd_idr, i); | |
493 | #endif | |
494 | fail_locked: | |
495 | mutex_unlock(&mtd_table_mutex); | |
e29c22f5 KP |
496 | return 1; |
497 | } | |
498 | ||
499 | /** | |
ff94bc40 HS |
500 | * del_mtd_device - unregister an MTD device |
501 | * @mtd: pointer to MTD device info structure | |
e29c22f5 | 502 | * |
ff94bc40 HS |
503 | * Remove a device from the list of MTD devices present in the system, |
504 | * and notify each currently active MTD 'user' of its departure. | |
505 | * Returns zero on success or 1 on failure, which currently will happen | |
506 | * if the requested device does not appear to be present in the list. | |
e29c22f5 | 507 | */ |
ff94bc40 | 508 | |
e29c22f5 KP |
509 | int del_mtd_device(struct mtd_info *mtd) |
510 | { | |
511 | int ret; | |
ff94bc40 HS |
512 | #ifndef __UBOOT__ |
513 | struct mtd_notifier *not; | |
514 | #endif | |
515 | ||
516 | mutex_lock(&mtd_table_mutex); | |
e29c22f5 | 517 | |
ff94bc40 | 518 | if (idr_find(&mtd_idr, mtd->index) != mtd) { |
e29c22f5 | 519 | ret = -ENODEV; |
ff94bc40 HS |
520 | goto out_error; |
521 | } | |
522 | ||
523 | #ifndef __UBOOT__ | |
524 | /* No need to get a refcount on the module containing | |
525 | the notifier, since we hold the mtd_table_mutex */ | |
526 | list_for_each_entry(not, &mtd_notifiers, list) | |
527 | not->remove(mtd); | |
528 | #endif | |
529 | ||
530 | if (mtd->usecount) { | |
531 | printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", | |
532 | mtd->index, mtd->name, mtd->usecount); | |
e29c22f5 KP |
533 | ret = -EBUSY; |
534 | } else { | |
ff94bc40 HS |
535 | #ifndef __UBOOT__ |
536 | device_unregister(&mtd->dev); | |
537 | #endif | |
538 | ||
539 | idr_remove(&mtd_idr, mtd->index); | |
e29c22f5 | 540 | |
ff94bc40 | 541 | module_put(THIS_MODULE); |
e29c22f5 KP |
542 | ret = 0; |
543 | } | |
544 | ||
ff94bc40 HS |
545 | out_error: |
546 | mutex_unlock(&mtd_table_mutex); | |
e29c22f5 KP |
547 | return ret; |
548 | } | |
549 | ||
ff94bc40 HS |
550 | #ifndef __UBOOT__ |
551 | /** | |
552 | * mtd_device_parse_register - parse partitions and register an MTD device. | |
553 | * | |
554 | * @mtd: the MTD device to register | |
555 | * @types: the list of MTD partition probes to try, see | |
556 | * 'parse_mtd_partitions()' for more information | |
557 | * @parser_data: MTD partition parser-specific data | |
558 | * @parts: fallback partition information to register, if parsing fails; | |
559 | * only valid if %nr_parts > %0 | |
560 | * @nr_parts: the number of partitions in parts, if zero then the full | |
561 | * MTD device is registered if no partition info is found | |
562 | * | |
563 | * This function aggregates MTD partitions parsing (done by | |
564 | * 'parse_mtd_partitions()') and MTD device and partitions registering. It | |
565 | * basically follows the most common pattern found in many MTD drivers: | |
566 | * | |
567 | * * It first tries to probe partitions on MTD device @mtd using parsers | |
568 | * specified in @types (if @types is %NULL, then the default list of parsers | |
569 | * is used, see 'parse_mtd_partitions()' for more information). If none are | |
570 | * found this functions tries to fallback to information specified in | |
571 | * @parts/@nr_parts. | |
572 | * * If any partitioning info was found, this function registers the found | |
573 | * partitions. | |
574 | * * If no partitions were found this function just registers the MTD device | |
575 | * @mtd and exits. | |
576 | * | |
577 | * Returns zero in case of success and a negative error code in case of failure. | |
578 | */ | |
579 | int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types, | |
580 | struct mtd_part_parser_data *parser_data, | |
581 | const struct mtd_partition *parts, | |
582 | int nr_parts) | |
583 | { | |
584 | int err; | |
585 | struct mtd_partition *real_parts; | |
586 | ||
587 | err = parse_mtd_partitions(mtd, types, &real_parts, parser_data); | |
588 | if (err <= 0 && nr_parts && parts) { | |
589 | real_parts = kmemdup(parts, sizeof(*parts) * nr_parts, | |
590 | GFP_KERNEL); | |
591 | if (!real_parts) | |
592 | err = -ENOMEM; | |
593 | else | |
594 | err = nr_parts; | |
595 | } | |
596 | ||
597 | if (err > 0) { | |
598 | err = add_mtd_partitions(mtd, real_parts, err); | |
599 | kfree(real_parts); | |
600 | } else if (err == 0) { | |
601 | err = add_mtd_device(mtd); | |
602 | if (err == 1) | |
603 | err = -ENODEV; | |
604 | } | |
605 | ||
606 | return err; | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(mtd_device_parse_register); | |
609 | ||
610 | /** | |
611 | * mtd_device_unregister - unregister an existing MTD device. | |
612 | * | |
613 | * @master: the MTD device to unregister. This will unregister both the master | |
614 | * and any partitions if registered. | |
615 | */ | |
616 | int mtd_device_unregister(struct mtd_info *master) | |
617 | { | |
618 | int err; | |
619 | ||
620 | err = del_mtd_partitions(master); | |
621 | if (err) | |
622 | return err; | |
623 | ||
624 | if (!device_is_registered(&master->dev)) | |
625 | return 0; | |
626 | ||
627 | return del_mtd_device(master); | |
628 | } | |
629 | EXPORT_SYMBOL_GPL(mtd_device_unregister); | |
630 | ||
631 | /** | |
632 | * register_mtd_user - register a 'user' of MTD devices. | |
633 | * @new: pointer to notifier info structure | |
634 | * | |
635 | * Registers a pair of callbacks function to be called upon addition | |
636 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
637 | * invoked for each MTD device currently present in the system. | |
638 | */ | |
639 | void register_mtd_user (struct mtd_notifier *new) | |
640 | { | |
641 | struct mtd_info *mtd; | |
642 | ||
643 | mutex_lock(&mtd_table_mutex); | |
644 | ||
645 | list_add(&new->list, &mtd_notifiers); | |
646 | ||
647 | __module_get(THIS_MODULE); | |
648 | ||
649 | mtd_for_each_device(mtd) | |
650 | new->add(mtd); | |
651 | ||
652 | mutex_unlock(&mtd_table_mutex); | |
653 | } | |
654 | EXPORT_SYMBOL_GPL(register_mtd_user); | |
655 | ||
656 | /** | |
657 | * unregister_mtd_user - unregister a 'user' of MTD devices. | |
658 | * @old: pointer to notifier info structure | |
659 | * | |
660 | * Removes a callback function pair from the list of 'users' to be | |
661 | * notified upon addition or removal of MTD devices. Causes the | |
662 | * 'remove' callback to be immediately invoked for each MTD device | |
663 | * currently present in the system. | |
664 | */ | |
665 | int unregister_mtd_user (struct mtd_notifier *old) | |
666 | { | |
667 | struct mtd_info *mtd; | |
668 | ||
669 | mutex_lock(&mtd_table_mutex); | |
670 | ||
671 | module_put(THIS_MODULE); | |
672 | ||
673 | mtd_for_each_device(mtd) | |
674 | old->remove(mtd); | |
675 | ||
676 | list_del(&old->list); | |
677 | mutex_unlock(&mtd_table_mutex); | |
678 | return 0; | |
679 | } | |
680 | EXPORT_SYMBOL_GPL(unregister_mtd_user); | |
681 | #endif | |
682 | ||
e29c22f5 KP |
683 | /** |
684 | * get_mtd_device - obtain a validated handle for an MTD device | |
685 | * @mtd: last known address of the required MTD device | |
686 | * @num: internal device number of the required MTD device | |
687 | * | |
688 | * Given a number and NULL address, return the num'th entry in the device | |
ff94bc40 HS |
689 | * table, if any. Given an address and num == -1, search the device table |
690 | * for a device with that address and return if it's still present. Given | |
691 | * both, return the num'th driver only if its address matches. Return | |
692 | * error code if not. | |
e29c22f5 KP |
693 | */ |
694 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) | |
695 | { | |
ff94bc40 HS |
696 | struct mtd_info *ret = NULL, *other; |
697 | int err = -ENODEV; | |
698 | ||
699 | mutex_lock(&mtd_table_mutex); | |
e29c22f5 KP |
700 | |
701 | if (num == -1) { | |
ff94bc40 HS |
702 | mtd_for_each_device(other) { |
703 | if (other == mtd) { | |
704 | ret = mtd; | |
705 | break; | |
706 | } | |
707 | } | |
708 | } else if (num >= 0) { | |
709 | ret = idr_find(&mtd_idr, num); | |
e29c22f5 KP |
710 | if (mtd && mtd != ret) |
711 | ret = NULL; | |
712 | } | |
713 | ||
ff94bc40 HS |
714 | if (!ret) { |
715 | ret = ERR_PTR(err); | |
716 | goto out; | |
717 | } | |
e29c22f5 | 718 | |
ff94bc40 HS |
719 | err = __get_mtd_device(ret); |
720 | if (err) | |
721 | ret = ERR_PTR(err); | |
722 | out: | |
723 | mutex_unlock(&mtd_table_mutex); | |
e29c22f5 | 724 | return ret; |
ff94bc40 HS |
725 | } |
726 | EXPORT_SYMBOL_GPL(get_mtd_device); | |
e29c22f5 | 727 | |
ff94bc40 HS |
728 | |
729 | int __get_mtd_device(struct mtd_info *mtd) | |
730 | { | |
731 | int err; | |
732 | ||
733 | if (!try_module_get(mtd->owner)) | |
734 | return -ENODEV; | |
735 | ||
736 | if (mtd->_get_device) { | |
737 | err = mtd->_get_device(mtd); | |
738 | ||
739 | if (err) { | |
740 | module_put(mtd->owner); | |
741 | return err; | |
742 | } | |
743 | } | |
744 | mtd->usecount++; | |
745 | return 0; | |
e29c22f5 | 746 | } |
ff94bc40 | 747 | EXPORT_SYMBOL_GPL(__get_mtd_device); |
e29c22f5 KP |
748 | |
749 | /** | |
ff94bc40 HS |
750 | * get_mtd_device_nm - obtain a validated handle for an MTD device by |
751 | * device name | |
752 | * @name: MTD device name to open | |
e29c22f5 | 753 | * |
ff94bc40 HS |
754 | * This function returns MTD device description structure in case of |
755 | * success and an error code in case of failure. | |
e29c22f5 KP |
756 | */ |
757 | struct mtd_info *get_mtd_device_nm(const char *name) | |
758 | { | |
ff94bc40 HS |
759 | int err = -ENODEV; |
760 | struct mtd_info *mtd = NULL, *other; | |
761 | ||
762 | mutex_lock(&mtd_table_mutex); | |
e29c22f5 | 763 | |
ff94bc40 HS |
764 | mtd_for_each_device(other) { |
765 | if (!strcmp(name, other->name)) { | |
766 | mtd = other; | |
e29c22f5 KP |
767 | break; |
768 | } | |
769 | } | |
770 | ||
771 | if (!mtd) | |
772 | goto out_unlock; | |
773 | ||
ff94bc40 HS |
774 | err = __get_mtd_device(mtd); |
775 | if (err) | |
776 | goto out_unlock; | |
777 | ||
778 | mutex_unlock(&mtd_table_mutex); | |
e29c22f5 KP |
779 | return mtd; |
780 | ||
781 | out_unlock: | |
ff94bc40 | 782 | mutex_unlock(&mtd_table_mutex); |
e29c22f5 KP |
783 | return ERR_PTR(err); |
784 | } | |
ff94bc40 | 785 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); |
4ba692fb BG |
786 | |
787 | #if defined(CONFIG_CMD_MTDPARTS_SPREAD) | |
788 | /** | |
789 | * mtd_get_len_incl_bad | |
790 | * | |
791 | * Check if length including bad blocks fits into device. | |
792 | * | |
793 | * @param mtd an MTD device | |
794 | * @param offset offset in flash | |
795 | * @param length image length | |
796 | * @return image length including bad blocks in *len_incl_bad and whether or not | |
797 | * the length returned was truncated in *truncated | |
798 | */ | |
799 | void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset, | |
800 | const uint64_t length, uint64_t *len_incl_bad, | |
801 | int *truncated) | |
802 | { | |
803 | *truncated = 0; | |
804 | *len_incl_bad = 0; | |
805 | ||
5da163d6 | 806 | if (!mtd->_block_isbad) { |
4ba692fb BG |
807 | *len_incl_bad = length; |
808 | return; | |
809 | } | |
810 | ||
811 | uint64_t len_excl_bad = 0; | |
812 | uint64_t block_len; | |
813 | ||
814 | while (len_excl_bad < length) { | |
36650ca9 SW |
815 | if (offset >= mtd->size) { |
816 | *truncated = 1; | |
817 | return; | |
818 | } | |
819 | ||
4ba692fb BG |
820 | block_len = mtd->erasesize - (offset & (mtd->erasesize - 1)); |
821 | ||
5da163d6 | 822 | if (!mtd->_block_isbad(mtd, offset & ~(mtd->erasesize - 1))) |
4ba692fb BG |
823 | len_excl_bad += block_len; |
824 | ||
825 | *len_incl_bad += block_len; | |
826 | offset += block_len; | |
4ba692fb BG |
827 | } |
828 | } | |
829 | #endif /* defined(CONFIG_CMD_MTDPARTS_SPREAD) */ | |
dfe64e2c | 830 | |
ff94bc40 HS |
831 | void put_mtd_device(struct mtd_info *mtd) |
832 | { | |
833 | mutex_lock(&mtd_table_mutex); | |
834 | __put_mtd_device(mtd); | |
835 | mutex_unlock(&mtd_table_mutex); | |
836 | ||
837 | } | |
838 | EXPORT_SYMBOL_GPL(put_mtd_device); | |
839 | ||
840 | void __put_mtd_device(struct mtd_info *mtd) | |
841 | { | |
842 | --mtd->usecount; | |
843 | BUG_ON(mtd->usecount < 0); | |
844 | ||
845 | if (mtd->_put_device) | |
846 | mtd->_put_device(mtd); | |
847 | ||
848 | module_put(mtd->owner); | |
849 | } | |
850 | EXPORT_SYMBOL_GPL(__put_mtd_device); | |
851 | ||
852 | /* | |
dfe64e2c SL |
853 | * Erase is an asynchronous operation. Device drivers are supposed |
854 | * to call instr->callback() whenever the operation completes, even | |
855 | * if it completes with a failure. | |
856 | * Callers are supposed to pass a callback function and wait for it | |
857 | * to be called before writing to the block. | |
858 | */ | |
859 | int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) | |
860 | { | |
861 | if (instr->addr > mtd->size || instr->len > mtd->size - instr->addr) | |
862 | return -EINVAL; | |
863 | if (!(mtd->flags & MTD_WRITEABLE)) | |
864 | return -EROFS; | |
865 | instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; | |
866 | if (!instr->len) { | |
867 | instr->state = MTD_ERASE_DONE; | |
868 | mtd_erase_callback(instr); | |
869 | return 0; | |
870 | } | |
871 | return mtd->_erase(mtd, instr); | |
872 | } | |
ff94bc40 HS |
873 | EXPORT_SYMBOL_GPL(mtd_erase); |
874 | ||
875 | #ifndef __UBOOT__ | |
876 | /* | |
877 | * This stuff for eXecute-In-Place. phys is optional and may be set to NULL. | |
878 | */ | |
879 | int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
880 | void **virt, resource_size_t *phys) | |
881 | { | |
882 | *retlen = 0; | |
883 | *virt = NULL; | |
884 | if (phys) | |
885 | *phys = 0; | |
886 | if (!mtd->_point) | |
887 | return -EOPNOTSUPP; | |
888 | if (from < 0 || from > mtd->size || len > mtd->size - from) | |
889 | return -EINVAL; | |
890 | if (!len) | |
891 | return 0; | |
892 | return mtd->_point(mtd, from, len, retlen, virt, phys); | |
893 | } | |
894 | EXPORT_SYMBOL_GPL(mtd_point); | |
895 | ||
896 | /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ | |
897 | int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len) | |
898 | { | |
899 | if (!mtd->_point) | |
900 | return -EOPNOTSUPP; | |
901 | if (from < 0 || from > mtd->size || len > mtd->size - from) | |
902 | return -EINVAL; | |
903 | if (!len) | |
904 | return 0; | |
905 | return mtd->_unpoint(mtd, from, len); | |
906 | } | |
907 | EXPORT_SYMBOL_GPL(mtd_unpoint); | |
908 | #endif | |
909 | ||
910 | /* | |
911 | * Allow NOMMU mmap() to directly map the device (if not NULL) | |
912 | * - return the address to which the offset maps | |
913 | * - return -ENOSYS to indicate refusal to do the mapping | |
914 | */ | |
915 | unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, | |
916 | unsigned long offset, unsigned long flags) | |
917 | { | |
918 | if (!mtd->_get_unmapped_area) | |
919 | return -EOPNOTSUPP; | |
920 | if (offset > mtd->size || len > mtd->size - offset) | |
921 | return -EINVAL; | |
922 | return mtd->_get_unmapped_area(mtd, len, offset, flags); | |
923 | } | |
924 | EXPORT_SYMBOL_GPL(mtd_get_unmapped_area); | |
dfe64e2c SL |
925 | |
926 | int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
927 | u_char *buf) | |
928 | { | |
40462e54 | 929 | int ret_code; |
ff94bc40 | 930 | *retlen = 0; |
dfe64e2c SL |
931 | if (from < 0 || from > mtd->size || len > mtd->size - from) |
932 | return -EINVAL; | |
933 | if (!len) | |
934 | return 0; | |
40462e54 PB |
935 | |
936 | /* | |
937 | * In the absence of an error, drivers return a non-negative integer | |
938 | * representing the maximum number of bitflips that were corrected on | |
939 | * any one ecc region (if applicable; zero otherwise). | |
940 | */ | |
941 | ret_code = mtd->_read(mtd, from, len, retlen, buf); | |
942 | if (unlikely(ret_code < 0)) | |
943 | return ret_code; | |
944 | if (mtd->ecc_strength == 0) | |
945 | return 0; /* device lacks ecc */ | |
946 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; | |
dfe64e2c | 947 | } |
ff94bc40 | 948 | EXPORT_SYMBOL_GPL(mtd_read); |
dfe64e2c SL |
949 | |
950 | int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
951 | const u_char *buf) | |
952 | { | |
953 | *retlen = 0; | |
954 | if (to < 0 || to > mtd->size || len > mtd->size - to) | |
955 | return -EINVAL; | |
956 | if (!mtd->_write || !(mtd->flags & MTD_WRITEABLE)) | |
957 | return -EROFS; | |
958 | if (!len) | |
959 | return 0; | |
960 | return mtd->_write(mtd, to, len, retlen, buf); | |
961 | } | |
ff94bc40 | 962 | EXPORT_SYMBOL_GPL(mtd_write); |
dfe64e2c SL |
963 | |
964 | /* | |
965 | * In blackbox flight recorder like scenarios we want to make successful writes | |
966 | * in interrupt context. panic_write() is only intended to be called when its | |
967 | * known the kernel is about to panic and we need the write to succeed. Since | |
968 | * the kernel is not going to be running for much longer, this function can | |
969 | * break locks and delay to ensure the write succeeds (but not sleep). | |
970 | */ | |
971 | int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
972 | const u_char *buf) | |
973 | { | |
974 | *retlen = 0; | |
975 | if (!mtd->_panic_write) | |
976 | return -EOPNOTSUPP; | |
977 | if (to < 0 || to > mtd->size || len > mtd->size - to) | |
978 | return -EINVAL; | |
979 | if (!(mtd->flags & MTD_WRITEABLE)) | |
980 | return -EROFS; | |
981 | if (!len) | |
982 | return 0; | |
983 | return mtd->_panic_write(mtd, to, len, retlen, buf); | |
984 | } | |
ff94bc40 | 985 | EXPORT_SYMBOL_GPL(mtd_panic_write); |
dfe64e2c SL |
986 | |
987 | int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) | |
988 | { | |
ff94bc40 | 989 | int ret_code; |
dfe64e2c SL |
990 | ops->retlen = ops->oobretlen = 0; |
991 | if (!mtd->_read_oob) | |
992 | return -EOPNOTSUPP; | |
ff94bc40 HS |
993 | /* |
994 | * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics | |
995 | * similar to mtd->_read(), returning a non-negative integer | |
996 | * representing max bitflips. In other cases, mtd->_read_oob() may | |
997 | * return -EUCLEAN. In all cases, perform similar logic to mtd_read(). | |
998 | */ | |
999 | ret_code = mtd->_read_oob(mtd, from, ops); | |
1000 | if (unlikely(ret_code < 0)) | |
1001 | return ret_code; | |
1002 | if (mtd->ecc_strength == 0) | |
1003 | return 0; /* device lacks ecc */ | |
1004 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; | |
dfe64e2c | 1005 | } |
ff94bc40 | 1006 | EXPORT_SYMBOL_GPL(mtd_read_oob); |
dfe64e2c | 1007 | |
13f3b04f BB |
1008 | /** |
1009 | * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section | |
1010 | * @mtd: MTD device structure | |
1011 | * @section: ECC section. Depending on the layout you may have all the ECC | |
1012 | * bytes stored in a single contiguous section, or one section | |
1013 | * per ECC chunk (and sometime several sections for a single ECC | |
1014 | * ECC chunk) | |
1015 | * @oobecc: OOB region struct filled with the appropriate ECC position | |
1016 | * information | |
1017 | * | |
1018 | * This function returns ECC section information in the OOB area. If you want | |
1019 | * to get all the ECC bytes information, then you should call | |
1020 | * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE. | |
1021 | * | |
1022 | * Returns zero on success, a negative error code otherwise. | |
1023 | */ | |
1024 | int mtd_ooblayout_ecc(struct mtd_info *mtd, int section, | |
1025 | struct mtd_oob_region *oobecc) | |
1026 | { | |
1027 | memset(oobecc, 0, sizeof(*oobecc)); | |
1028 | ||
1029 | if (!mtd || section < 0) | |
1030 | return -EINVAL; | |
1031 | ||
1032 | if (!mtd->ooblayout || !mtd->ooblayout->ecc) | |
1033 | return -ENOTSUPP; | |
1034 | ||
1035 | return mtd->ooblayout->ecc(mtd, section, oobecc); | |
1036 | } | |
1037 | EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc); | |
1038 | ||
1039 | /** | |
1040 | * mtd_ooblayout_free - Get the OOB region definition of a specific free | |
1041 | * section | |
1042 | * @mtd: MTD device structure | |
1043 | * @section: Free section you are interested in. Depending on the layout | |
1044 | * you may have all the free bytes stored in a single contiguous | |
1045 | * section, or one section per ECC chunk plus an extra section | |
1046 | * for the remaining bytes (or other funky layout). | |
1047 | * @oobfree: OOB region struct filled with the appropriate free position | |
1048 | * information | |
1049 | * | |
1050 | * This function returns free bytes position in the OOB area. If you want | |
1051 | * to get all the free bytes information, then you should call | |
1052 | * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE. | |
1053 | * | |
1054 | * Returns zero on success, a negative error code otherwise. | |
1055 | */ | |
1056 | int mtd_ooblayout_free(struct mtd_info *mtd, int section, | |
1057 | struct mtd_oob_region *oobfree) | |
1058 | { | |
1059 | memset(oobfree, 0, sizeof(*oobfree)); | |
1060 | ||
1061 | if (!mtd || section < 0) | |
1062 | return -EINVAL; | |
1063 | ||
1064 | if (!mtd->ooblayout || !mtd->ooblayout->free) | |
1065 | return -ENOTSUPP; | |
1066 | ||
1067 | return mtd->ooblayout->free(mtd, section, oobfree); | |
1068 | } | |
1069 | EXPORT_SYMBOL_GPL(mtd_ooblayout_free); | |
1070 | ||
1071 | /** | |
1072 | * mtd_ooblayout_find_region - Find the region attached to a specific byte | |
1073 | * @mtd: mtd info structure | |
1074 | * @byte: the byte we are searching for | |
1075 | * @sectionp: pointer where the section id will be stored | |
1076 | * @oobregion: used to retrieve the ECC position | |
1077 | * @iter: iterator function. Should be either mtd_ooblayout_free or | |
1078 | * mtd_ooblayout_ecc depending on the region type you're searching for | |
1079 | * | |
1080 | * This function returns the section id and oobregion information of a | |
1081 | * specific byte. For example, say you want to know where the 4th ECC byte is | |
1082 | * stored, you'll use: | |
1083 | * | |
1084 | * mtd_ooblayout_find_region(mtd, 3, §ion, &oobregion, mtd_ooblayout_ecc); | |
1085 | * | |
1086 | * Returns zero on success, a negative error code otherwise. | |
1087 | */ | |
1088 | static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte, | |
1089 | int *sectionp, struct mtd_oob_region *oobregion, | |
1090 | int (*iter)(struct mtd_info *, | |
1091 | int section, | |
1092 | struct mtd_oob_region *oobregion)) | |
1093 | { | |
1094 | int pos = 0, ret, section = 0; | |
1095 | ||
1096 | memset(oobregion, 0, sizeof(*oobregion)); | |
1097 | ||
1098 | while (1) { | |
1099 | ret = iter(mtd, section, oobregion); | |
1100 | if (ret) | |
1101 | return ret; | |
1102 | ||
1103 | if (pos + oobregion->length > byte) | |
1104 | break; | |
1105 | ||
1106 | pos += oobregion->length; | |
1107 | section++; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * Adjust region info to make it start at the beginning at the | |
1112 | * 'start' ECC byte. | |
1113 | */ | |
1114 | oobregion->offset += byte - pos; | |
1115 | oobregion->length -= byte - pos; | |
1116 | *sectionp = section; | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | /** | |
1122 | * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific | |
1123 | * ECC byte | |
1124 | * @mtd: mtd info structure | |
1125 | * @eccbyte: the byte we are searching for | |
1126 | * @sectionp: pointer where the section id will be stored | |
1127 | * @oobregion: OOB region information | |
1128 | * | |
1129 | * Works like mtd_ooblayout_find_region() except it searches for a specific ECC | |
1130 | * byte. | |
1131 | * | |
1132 | * Returns zero on success, a negative error code otherwise. | |
1133 | */ | |
1134 | int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte, | |
1135 | int *section, | |
1136 | struct mtd_oob_region *oobregion) | |
1137 | { | |
1138 | return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion, | |
1139 | mtd_ooblayout_ecc); | |
1140 | } | |
1141 | EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion); | |
1142 | ||
1143 | /** | |
1144 | * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer | |
1145 | * @mtd: mtd info structure | |
1146 | * @buf: destination buffer to store OOB bytes | |
1147 | * @oobbuf: OOB buffer | |
1148 | * @start: first byte to retrieve | |
1149 | * @nbytes: number of bytes to retrieve | |
1150 | * @iter: section iterator | |
1151 | * | |
1152 | * Extract bytes attached to a specific category (ECC or free) | |
1153 | * from the OOB buffer and copy them into buf. | |
1154 | * | |
1155 | * Returns zero on success, a negative error code otherwise. | |
1156 | */ | |
1157 | static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf, | |
1158 | const u8 *oobbuf, int start, int nbytes, | |
1159 | int (*iter)(struct mtd_info *, | |
1160 | int section, | |
1161 | struct mtd_oob_region *oobregion)) | |
1162 | { | |
1163 | struct mtd_oob_region oobregion; | |
1164 | int section, ret; | |
1165 | ||
1166 | ret = mtd_ooblayout_find_region(mtd, start, §ion, | |
1167 | &oobregion, iter); | |
1168 | ||
1169 | while (!ret) { | |
1170 | int cnt; | |
1171 | ||
1172 | cnt = min_t(int, nbytes, oobregion.length); | |
1173 | memcpy(buf, oobbuf + oobregion.offset, cnt); | |
1174 | buf += cnt; | |
1175 | nbytes -= cnt; | |
1176 | ||
1177 | if (!nbytes) | |
1178 | break; | |
1179 | ||
1180 | ret = iter(mtd, ++section, &oobregion); | |
1181 | } | |
1182 | ||
1183 | return ret; | |
1184 | } | |
1185 | ||
1186 | /** | |
1187 | * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer | |
1188 | * @mtd: mtd info structure | |
1189 | * @buf: source buffer to get OOB bytes from | |
1190 | * @oobbuf: OOB buffer | |
1191 | * @start: first OOB byte to set | |
1192 | * @nbytes: number of OOB bytes to set | |
1193 | * @iter: section iterator | |
1194 | * | |
1195 | * Fill the OOB buffer with data provided in buf. The category (ECC or free) | |
1196 | * is selected by passing the appropriate iterator. | |
1197 | * | |
1198 | * Returns zero on success, a negative error code otherwise. | |
1199 | */ | |
1200 | static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf, | |
1201 | u8 *oobbuf, int start, int nbytes, | |
1202 | int (*iter)(struct mtd_info *, | |
1203 | int section, | |
1204 | struct mtd_oob_region *oobregion)) | |
1205 | { | |
1206 | struct mtd_oob_region oobregion; | |
1207 | int section, ret; | |
1208 | ||
1209 | ret = mtd_ooblayout_find_region(mtd, start, §ion, | |
1210 | &oobregion, iter); | |
1211 | ||
1212 | while (!ret) { | |
1213 | int cnt; | |
1214 | ||
1215 | cnt = min_t(int, nbytes, oobregion.length); | |
1216 | memcpy(oobbuf + oobregion.offset, buf, cnt); | |
1217 | buf += cnt; | |
1218 | nbytes -= cnt; | |
1219 | ||
1220 | if (!nbytes) | |
1221 | break; | |
1222 | ||
1223 | ret = iter(mtd, ++section, &oobregion); | |
1224 | } | |
1225 | ||
1226 | return ret; | |
1227 | } | |
1228 | ||
1229 | /** | |
1230 | * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category | |
1231 | * @mtd: mtd info structure | |
1232 | * @iter: category iterator | |
1233 | * | |
1234 | * Count the number of bytes in a given category. | |
1235 | * | |
1236 | * Returns a positive value on success, a negative error code otherwise. | |
1237 | */ | |
1238 | static int mtd_ooblayout_count_bytes(struct mtd_info *mtd, | |
1239 | int (*iter)(struct mtd_info *, | |
1240 | int section, | |
1241 | struct mtd_oob_region *oobregion)) | |
1242 | { | |
1243 | struct mtd_oob_region oobregion; | |
1244 | int section = 0, ret, nbytes = 0; | |
1245 | ||
1246 | while (1) { | |
1247 | ret = iter(mtd, section++, &oobregion); | |
1248 | if (ret) { | |
1249 | if (ret == -ERANGE) | |
1250 | ret = nbytes; | |
1251 | break; | |
1252 | } | |
1253 | ||
1254 | nbytes += oobregion.length; | |
1255 | } | |
1256 | ||
1257 | return ret; | |
1258 | } | |
1259 | ||
1260 | /** | |
1261 | * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer | |
1262 | * @mtd: mtd info structure | |
1263 | * @eccbuf: destination buffer to store ECC bytes | |
1264 | * @oobbuf: OOB buffer | |
1265 | * @start: first ECC byte to retrieve | |
1266 | * @nbytes: number of ECC bytes to retrieve | |
1267 | * | |
1268 | * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes. | |
1269 | * | |
1270 | * Returns zero on success, a negative error code otherwise. | |
1271 | */ | |
1272 | int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf, | |
1273 | const u8 *oobbuf, int start, int nbytes) | |
1274 | { | |
1275 | return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes, | |
1276 | mtd_ooblayout_ecc); | |
1277 | } | |
1278 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes); | |
1279 | ||
1280 | /** | |
1281 | * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer | |
1282 | * @mtd: mtd info structure | |
1283 | * @eccbuf: source buffer to get ECC bytes from | |
1284 | * @oobbuf: OOB buffer | |
1285 | * @start: first ECC byte to set | |
1286 | * @nbytes: number of ECC bytes to set | |
1287 | * | |
1288 | * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes. | |
1289 | * | |
1290 | * Returns zero on success, a negative error code otherwise. | |
1291 | */ | |
1292 | int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf, | |
1293 | u8 *oobbuf, int start, int nbytes) | |
1294 | { | |
1295 | return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes, | |
1296 | mtd_ooblayout_ecc); | |
1297 | } | |
1298 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes); | |
1299 | ||
1300 | /** | |
1301 | * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer | |
1302 | * @mtd: mtd info structure | |
1303 | * @databuf: destination buffer to store ECC bytes | |
1304 | * @oobbuf: OOB buffer | |
1305 | * @start: first ECC byte to retrieve | |
1306 | * @nbytes: number of ECC bytes to retrieve | |
1307 | * | |
1308 | * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. | |
1309 | * | |
1310 | * Returns zero on success, a negative error code otherwise. | |
1311 | */ | |
1312 | int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf, | |
1313 | const u8 *oobbuf, int start, int nbytes) | |
1314 | { | |
1315 | return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes, | |
1316 | mtd_ooblayout_free); | |
1317 | } | |
1318 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes); | |
1319 | ||
1320 | /** | |
1321 | * mtd_ooblayout_get_eccbytes - set data bytes into the oob buffer | |
1322 | * @mtd: mtd info structure | |
1323 | * @eccbuf: source buffer to get data bytes from | |
1324 | * @oobbuf: OOB buffer | |
1325 | * @start: first ECC byte to set | |
1326 | * @nbytes: number of ECC bytes to set | |
1327 | * | |
1328 | * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. | |
1329 | * | |
1330 | * Returns zero on success, a negative error code otherwise. | |
1331 | */ | |
1332 | int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf, | |
1333 | u8 *oobbuf, int start, int nbytes) | |
1334 | { | |
1335 | return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes, | |
1336 | mtd_ooblayout_free); | |
1337 | } | |
1338 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes); | |
1339 | ||
1340 | /** | |
1341 | * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB | |
1342 | * @mtd: mtd info structure | |
1343 | * | |
1344 | * Works like mtd_ooblayout_count_bytes(), except it count free bytes. | |
1345 | * | |
1346 | * Returns zero on success, a negative error code otherwise. | |
1347 | */ | |
1348 | int mtd_ooblayout_count_freebytes(struct mtd_info *mtd) | |
1349 | { | |
1350 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free); | |
1351 | } | |
1352 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes); | |
1353 | ||
1354 | /** | |
1355 | * mtd_ooblayout_count_freebytes - count the number of ECC bytes in OOB | |
1356 | * @mtd: mtd info structure | |
1357 | * | |
1358 | * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes. | |
1359 | * | |
1360 | * Returns zero on success, a negative error code otherwise. | |
1361 | */ | |
1362 | int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd) | |
1363 | { | |
1364 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc); | |
1365 | } | |
1366 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes); | |
1367 | ||
dfe64e2c SL |
1368 | /* |
1369 | * Method to access the protection register area, present in some flash | |
1370 | * devices. The user data is one time programmable but the factory data is read | |
1371 | * only. | |
1372 | */ | |
4e67c571 HS |
1373 | int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
1374 | struct otp_info *buf) | |
dfe64e2c SL |
1375 | { |
1376 | if (!mtd->_get_fact_prot_info) | |
1377 | return -EOPNOTSUPP; | |
1378 | if (!len) | |
1379 | return 0; | |
4e67c571 | 1380 | return mtd->_get_fact_prot_info(mtd, len, retlen, buf); |
dfe64e2c | 1381 | } |
ff94bc40 | 1382 | EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info); |
dfe64e2c SL |
1383 | |
1384 | int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
1385 | size_t *retlen, u_char *buf) | |
1386 | { | |
1387 | *retlen = 0; | |
1388 | if (!mtd->_read_fact_prot_reg) | |
1389 | return -EOPNOTSUPP; | |
1390 | if (!len) | |
1391 | return 0; | |
1392 | return mtd->_read_fact_prot_reg(mtd, from, len, retlen, buf); | |
1393 | } | |
ff94bc40 | 1394 | EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg); |
dfe64e2c | 1395 | |
4e67c571 HS |
1396 | int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
1397 | struct otp_info *buf) | |
dfe64e2c SL |
1398 | { |
1399 | if (!mtd->_get_user_prot_info) | |
1400 | return -EOPNOTSUPP; | |
1401 | if (!len) | |
1402 | return 0; | |
4e67c571 | 1403 | return mtd->_get_user_prot_info(mtd, len, retlen, buf); |
dfe64e2c | 1404 | } |
ff94bc40 | 1405 | EXPORT_SYMBOL_GPL(mtd_get_user_prot_info); |
dfe64e2c SL |
1406 | |
1407 | int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
1408 | size_t *retlen, u_char *buf) | |
1409 | { | |
1410 | *retlen = 0; | |
1411 | if (!mtd->_read_user_prot_reg) | |
1412 | return -EOPNOTSUPP; | |
1413 | if (!len) | |
1414 | return 0; | |
1415 | return mtd->_read_user_prot_reg(mtd, from, len, retlen, buf); | |
1416 | } | |
ff94bc40 | 1417 | EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg); |
dfe64e2c SL |
1418 | |
1419 | int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, | |
1420 | size_t *retlen, u_char *buf) | |
1421 | { | |
4e67c571 HS |
1422 | int ret; |
1423 | ||
dfe64e2c SL |
1424 | *retlen = 0; |
1425 | if (!mtd->_write_user_prot_reg) | |
1426 | return -EOPNOTSUPP; | |
1427 | if (!len) | |
1428 | return 0; | |
4e67c571 HS |
1429 | ret = mtd->_write_user_prot_reg(mtd, to, len, retlen, buf); |
1430 | if (ret) | |
1431 | return ret; | |
1432 | ||
1433 | /* | |
1434 | * If no data could be written at all, we are out of memory and | |
1435 | * must return -ENOSPC. | |
1436 | */ | |
1437 | return (*retlen) ? 0 : -ENOSPC; | |
dfe64e2c | 1438 | } |
ff94bc40 | 1439 | EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg); |
dfe64e2c SL |
1440 | |
1441 | int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) | |
1442 | { | |
1443 | if (!mtd->_lock_user_prot_reg) | |
1444 | return -EOPNOTSUPP; | |
1445 | if (!len) | |
1446 | return 0; | |
1447 | return mtd->_lock_user_prot_reg(mtd, from, len); | |
1448 | } | |
ff94bc40 | 1449 | EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg); |
dfe64e2c SL |
1450 | |
1451 | /* Chip-supported device locking */ | |
1452 | int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
1453 | { | |
1454 | if (!mtd->_lock) | |
1455 | return -EOPNOTSUPP; | |
1456 | if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) | |
1457 | return -EINVAL; | |
1458 | if (!len) | |
1459 | return 0; | |
1460 | return mtd->_lock(mtd, ofs, len); | |
1461 | } | |
ff94bc40 | 1462 | EXPORT_SYMBOL_GPL(mtd_lock); |
dfe64e2c SL |
1463 | |
1464 | int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
1465 | { | |
1466 | if (!mtd->_unlock) | |
1467 | return -EOPNOTSUPP; | |
1468 | if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) | |
1469 | return -EINVAL; | |
1470 | if (!len) | |
1471 | return 0; | |
1472 | return mtd->_unlock(mtd, ofs, len); | |
1473 | } | |
ff94bc40 HS |
1474 | EXPORT_SYMBOL_GPL(mtd_unlock); |
1475 | ||
1476 | int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
1477 | { | |
1478 | if (!mtd->_is_locked) | |
1479 | return -EOPNOTSUPP; | |
1480 | if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) | |
1481 | return -EINVAL; | |
1482 | if (!len) | |
1483 | return 0; | |
1484 | return mtd->_is_locked(mtd, ofs, len); | |
1485 | } | |
1486 | EXPORT_SYMBOL_GPL(mtd_is_locked); | |
dfe64e2c | 1487 | |
86a720aa | 1488 | int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs) |
dfe64e2c | 1489 | { |
86a720aa EG |
1490 | if (ofs < 0 || ofs > mtd->size) |
1491 | return -EINVAL; | |
1492 | if (!mtd->_block_isreserved) | |
dfe64e2c | 1493 | return 0; |
86a720aa EG |
1494 | return mtd->_block_isreserved(mtd, ofs); |
1495 | } | |
1496 | EXPORT_SYMBOL_GPL(mtd_block_isreserved); | |
1497 | ||
1498 | int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) | |
1499 | { | |
dfe64e2c SL |
1500 | if (ofs < 0 || ofs > mtd->size) |
1501 | return -EINVAL; | |
86a720aa EG |
1502 | if (!mtd->_block_isbad) |
1503 | return 0; | |
dfe64e2c SL |
1504 | return mtd->_block_isbad(mtd, ofs); |
1505 | } | |
ff94bc40 | 1506 | EXPORT_SYMBOL_GPL(mtd_block_isbad); |
dfe64e2c SL |
1507 | |
1508 | int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
1509 | { | |
1510 | if (!mtd->_block_markbad) | |
1511 | return -EOPNOTSUPP; | |
1512 | if (ofs < 0 || ofs > mtd->size) | |
1513 | return -EINVAL; | |
1514 | if (!(mtd->flags & MTD_WRITEABLE)) | |
1515 | return -EROFS; | |
1516 | return mtd->_block_markbad(mtd, ofs); | |
1517 | } | |
ff94bc40 HS |
1518 | EXPORT_SYMBOL_GPL(mtd_block_markbad); |
1519 | ||
1520 | #ifndef __UBOOT__ | |
1521 | /* | |
1522 | * default_mtd_writev - the default writev method | |
1523 | * @mtd: mtd device description object pointer | |
1524 | * @vecs: the vectors to write | |
1525 | * @count: count of vectors in @vecs | |
1526 | * @to: the MTD device offset to write to | |
1527 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
1528 | * | |
1529 | * This function returns zero in case of success and a negative error code in | |
1530 | * case of failure. | |
1531 | */ | |
1532 | static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
1533 | unsigned long count, loff_t to, size_t *retlen) | |
1534 | { | |
1535 | unsigned long i; | |
1536 | size_t totlen = 0, thislen; | |
1537 | int ret = 0; | |
1538 | ||
1539 | for (i = 0; i < count; i++) { | |
1540 | if (!vecs[i].iov_len) | |
1541 | continue; | |
1542 | ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen, | |
1543 | vecs[i].iov_base); | |
1544 | totlen += thislen; | |
1545 | if (ret || thislen != vecs[i].iov_len) | |
1546 | break; | |
1547 | to += vecs[i].iov_len; | |
1548 | } | |
1549 | *retlen = totlen; | |
1550 | return ret; | |
1551 | } | |
1552 | ||
1553 | /* | |
1554 | * mtd_writev - the vector-based MTD write method | |
1555 | * @mtd: mtd device description object pointer | |
1556 | * @vecs: the vectors to write | |
1557 | * @count: count of vectors in @vecs | |
1558 | * @to: the MTD device offset to write to | |
1559 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
1560 | * | |
1561 | * This function returns zero in case of success and a negative error code in | |
1562 | * case of failure. | |
1563 | */ | |
1564 | int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
1565 | unsigned long count, loff_t to, size_t *retlen) | |
1566 | { | |
1567 | *retlen = 0; | |
1568 | if (!(mtd->flags & MTD_WRITEABLE)) | |
1569 | return -EROFS; | |
1570 | if (!mtd->_writev) | |
1571 | return default_mtd_writev(mtd, vecs, count, to, retlen); | |
1572 | return mtd->_writev(mtd, vecs, count, to, retlen); | |
1573 | } | |
1574 | EXPORT_SYMBOL_GPL(mtd_writev); | |
1575 | ||
1576 | /** | |
1577 | * mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size | |
1578 | * @mtd: mtd device description object pointer | |
1579 | * @size: a pointer to the ideal or maximum size of the allocation, points | |
1580 | * to the actual allocation size on success. | |
1581 | * | |
1582 | * This routine attempts to allocate a contiguous kernel buffer up to | |
1583 | * the specified size, backing off the size of the request exponentially | |
1584 | * until the request succeeds or until the allocation size falls below | |
1585 | * the system page size. This attempts to make sure it does not adversely | |
1586 | * impact system performance, so when allocating more than one page, we | |
1587 | * ask the memory allocator to avoid re-trying, swapping, writing back | |
1588 | * or performing I/O. | |
1589 | * | |
1590 | * Note, this function also makes sure that the allocated buffer is aligned to | |
1591 | * the MTD device's min. I/O unit, i.e. the "mtd->writesize" value. | |
1592 | * | |
1593 | * This is called, for example by mtd_{read,write} and jffs2_scan_medium, | |
1594 | * to handle smaller (i.e. degraded) buffer allocations under low- or | |
1595 | * fragmented-memory situations where such reduced allocations, from a | |
1596 | * requested ideal, are allowed. | |
1597 | * | |
1598 | * Returns a pointer to the allocated buffer on success; otherwise, NULL. | |
1599 | */ | |
1600 | void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size) | |
1601 | { | |
1602 | gfp_t flags = __GFP_NOWARN | __GFP_WAIT | | |
1603 | __GFP_NORETRY | __GFP_NO_KSWAPD; | |
1604 | size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE); | |
1605 | void *kbuf; | |
1606 | ||
1607 | *size = min_t(size_t, *size, KMALLOC_MAX_SIZE); | |
1608 | ||
1609 | while (*size > min_alloc) { | |
1610 | kbuf = kmalloc(*size, flags); | |
1611 | if (kbuf) | |
1612 | return kbuf; | |
1613 | ||
1614 | *size >>= 1; | |
1615 | *size = ALIGN(*size, mtd->writesize); | |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | * For the last resort allocation allow 'kmalloc()' to do all sorts of | |
1620 | * things (write-back, dropping caches, etc) by using GFP_KERNEL. | |
1621 | */ | |
1622 | return kmalloc(*size, GFP_KERNEL); | |
1623 | } | |
1624 | EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to); | |
1625 | #endif | |
1626 | ||
1627 | #ifdef CONFIG_PROC_FS | |
1628 | ||
1629 | /*====================================================================*/ | |
1630 | /* Support for /proc/mtd */ | |
1631 | ||
1632 | static int mtd_proc_show(struct seq_file *m, void *v) | |
1633 | { | |
1634 | struct mtd_info *mtd; | |
1635 | ||
1636 | seq_puts(m, "dev: size erasesize name\n"); | |
1637 | mutex_lock(&mtd_table_mutex); | |
1638 | mtd_for_each_device(mtd) { | |
1639 | seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\"\n", | |
1640 | mtd->index, (unsigned long long)mtd->size, | |
1641 | mtd->erasesize, mtd->name); | |
1642 | } | |
1643 | mutex_unlock(&mtd_table_mutex); | |
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | static int mtd_proc_open(struct inode *inode, struct file *file) | |
1648 | { | |
1649 | return single_open(file, mtd_proc_show, NULL); | |
1650 | } | |
1651 | ||
1652 | static const struct file_operations mtd_proc_ops = { | |
1653 | .open = mtd_proc_open, | |
1654 | .read = seq_read, | |
1655 | .llseek = seq_lseek, | |
1656 | .release = single_release, | |
1657 | }; | |
1658 | #endif /* CONFIG_PROC_FS */ | |
1659 | ||
1660 | /*====================================================================*/ | |
1661 | /* Init code */ | |
1662 | ||
1663 | #ifndef __UBOOT__ | |
1664 | static int __init mtd_bdi_init(struct backing_dev_info *bdi, const char *name) | |
1665 | { | |
1666 | int ret; | |
1667 | ||
1668 | ret = bdi_init(bdi); | |
1669 | if (!ret) | |
1670 | ret = bdi_register(bdi, NULL, "%s", name); | |
1671 | ||
1672 | if (ret) | |
1673 | bdi_destroy(bdi); | |
1674 | ||
1675 | return ret; | |
1676 | } | |
1677 | ||
1678 | static struct proc_dir_entry *proc_mtd; | |
1679 | ||
1680 | static int __init init_mtd(void) | |
1681 | { | |
1682 | int ret; | |
1683 | ||
1684 | ret = class_register(&mtd_class); | |
1685 | if (ret) | |
1686 | goto err_reg; | |
1687 | ||
1688 | ret = mtd_bdi_init(&mtd_bdi_unmappable, "mtd-unmap"); | |
1689 | if (ret) | |
1690 | goto err_bdi1; | |
1691 | ||
1692 | ret = mtd_bdi_init(&mtd_bdi_ro_mappable, "mtd-romap"); | |
1693 | if (ret) | |
1694 | goto err_bdi2; | |
1695 | ||
1696 | ret = mtd_bdi_init(&mtd_bdi_rw_mappable, "mtd-rwmap"); | |
1697 | if (ret) | |
1698 | goto err_bdi3; | |
1699 | ||
1700 | proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops); | |
1701 | ||
1702 | ret = init_mtdchar(); | |
1703 | if (ret) | |
1704 | goto out_procfs; | |
1705 | ||
1706 | return 0; | |
1707 | ||
1708 | out_procfs: | |
1709 | if (proc_mtd) | |
1710 | remove_proc_entry("mtd", NULL); | |
1711 | err_bdi3: | |
1712 | bdi_destroy(&mtd_bdi_ro_mappable); | |
1713 | err_bdi2: | |
1714 | bdi_destroy(&mtd_bdi_unmappable); | |
1715 | err_bdi1: | |
1716 | class_unregister(&mtd_class); | |
1717 | err_reg: | |
1718 | pr_err("Error registering mtd class or bdi: %d\n", ret); | |
1719 | return ret; | |
1720 | } | |
1721 | ||
1722 | static void __exit cleanup_mtd(void) | |
1723 | { | |
1724 | cleanup_mtdchar(); | |
1725 | if (proc_mtd) | |
1726 | remove_proc_entry("mtd", NULL); | |
1727 | class_unregister(&mtd_class); | |
1728 | bdi_destroy(&mtd_bdi_unmappable); | |
1729 | bdi_destroy(&mtd_bdi_ro_mappable); | |
1730 | bdi_destroy(&mtd_bdi_rw_mappable); | |
1731 | } | |
1732 | ||
1733 | module_init(init_mtd); | |
1734 | module_exit(cleanup_mtd); | |
1735 | #endif | |
1736 | ||
1737 | MODULE_LICENSE("GPL"); | |
1738 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
1739 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |