Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Core registration and callback routines for MTD |
3 | * drivers and users. | |
4 | * | |
a1452a37 DW |
5 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
6 | * Copyright © 2006 Red Hat UK Limited | |
7 | * | |
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 | |
21 | * | |
1da177e4 LT |
22 | */ |
23 | ||
1da177e4 LT |
24 | #include <linux/module.h> |
25 | #include <linux/kernel.h> | |
1da177e4 | 26 | #include <linux/ptrace.h> |
447d9bd8 | 27 | #include <linux/seq_file.h> |
1da177e4 LT |
28 | #include <linux/string.h> |
29 | #include <linux/timer.h> | |
30 | #include <linux/major.h> | |
31 | #include <linux/fs.h> | |
7799308f | 32 | #include <linux/err.h> |
1da177e4 LT |
33 | #include <linux/ioctl.h> |
34 | #include <linux/init.h> | |
1da177e4 | 35 | #include <linux/proc_fs.h> |
b520e412 | 36 | #include <linux/idr.h> |
a33eb6b9 | 37 | #include <linux/backing-dev.h> |
05d71b46 | 38 | #include <linux/gfp.h> |
1da177e4 LT |
39 | |
40 | #include <linux/mtd/mtd.h> | |
f5671ab3 | 41 | #include <linux/mtd/partitions.h> |
1da177e4 | 42 | |
356d70f1 | 43 | #include "mtdcore.h" |
a33eb6b9 JE |
44 | /* |
45 | * backing device capabilities for non-mappable devices (such as NAND flash) | |
46 | * - permits private mappings, copies are taken of the data | |
47 | */ | |
ca91facf | 48 | static struct backing_dev_info mtd_bdi_unmappable = { |
a33eb6b9 JE |
49 | .capabilities = BDI_CAP_MAP_COPY, |
50 | }; | |
51 | ||
52 | /* | |
53 | * backing device capabilities for R/O mappable devices (such as ROM) | |
54 | * - permits private mappings, copies are taken of the data | |
55 | * - permits non-writable shared mappings | |
56 | */ | |
ca91facf | 57 | static struct backing_dev_info mtd_bdi_ro_mappable = { |
a33eb6b9 JE |
58 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | |
59 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP), | |
60 | }; | |
61 | ||
62 | /* | |
63 | * backing device capabilities for writable mappable devices (such as RAM) | |
64 | * - permits private mappings, copies are taken of the data | |
65 | * - permits non-writable shared mappings | |
66 | */ | |
ca91facf | 67 | static struct backing_dev_info mtd_bdi_rw_mappable = { |
a33eb6b9 JE |
68 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | |
69 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | | |
70 | BDI_CAP_WRITE_MAP), | |
71 | }; | |
356d70f1 | 72 | |
15bce40c DW |
73 | static int mtd_cls_suspend(struct device *dev, pm_message_t state); |
74 | static int mtd_cls_resume(struct device *dev); | |
75 | ||
76 | static struct class mtd_class = { | |
77 | .name = "mtd", | |
78 | .owner = THIS_MODULE, | |
79 | .suspend = mtd_cls_suspend, | |
80 | .resume = mtd_cls_resume, | |
81 | }; | |
1f24b5a8 | 82 | |
b520e412 BH |
83 | static DEFINE_IDR(mtd_idr); |
84 | ||
97894cda | 85 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
1da177e4 | 86 | should not use them for _anything_ else */ |
48b19268 | 87 | DEFINE_MUTEX(mtd_table_mutex); |
1da177e4 | 88 | EXPORT_SYMBOL_GPL(mtd_table_mutex); |
b520e412 BH |
89 | |
90 | struct mtd_info *__mtd_next_device(int i) | |
91 | { | |
92 | return idr_get_next(&mtd_idr, &i); | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(__mtd_next_device); | |
1da177e4 LT |
95 | |
96 | static LIST_HEAD(mtd_notifiers); | |
97 | ||
1f24b5a8 DB |
98 | |
99 | #if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE) | |
100 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) | |
101 | #else | |
102 | #define MTD_DEVT(index) 0 | |
103 | #endif | |
104 | ||
105 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
106 | * the mtd_info will probably want to use the release() hook... | |
107 | */ | |
108 | static void mtd_release(struct device *dev) | |
109 | { | |
335a5f40 | 110 | struct mtd_info __maybe_unused *mtd = dev_get_drvdata(dev); |
d5de20a9 | 111 | dev_t index = MTD_DEVT(mtd->index); |
1f24b5a8 DB |
112 | |
113 | /* remove /dev/mtdXro node if needed */ | |
2fdb1144 | 114 | if (index) |
15bce40c DW |
115 | device_destroy(&mtd_class, index + 1); |
116 | } | |
117 | ||
118 | static int mtd_cls_suspend(struct device *dev, pm_message_t state) | |
119 | { | |
d5de20a9 | 120 | struct mtd_info *mtd = dev_get_drvdata(dev); |
6afc4fdb | 121 | |
1a30871f | 122 | return mtd ? mtd_suspend(mtd) : 0; |
15bce40c DW |
123 | } |
124 | ||
125 | static int mtd_cls_resume(struct device *dev) | |
126 | { | |
d5de20a9 | 127 | struct mtd_info *mtd = dev_get_drvdata(dev); |
33c87b4a | 128 | |
3ee50141 | 129 | if (mtd) |
ead995f8 | 130 | mtd_resume(mtd); |
15bce40c | 131 | return 0; |
1f24b5a8 DB |
132 | } |
133 | ||
134 | static ssize_t mtd_type_show(struct device *dev, | |
135 | struct device_attribute *attr, char *buf) | |
136 | { | |
d5de20a9 | 137 | struct mtd_info *mtd = dev_get_drvdata(dev); |
1f24b5a8 DB |
138 | char *type; |
139 | ||
140 | switch (mtd->type) { | |
141 | case MTD_ABSENT: | |
142 | type = "absent"; | |
143 | break; | |
144 | case MTD_RAM: | |
145 | type = "ram"; | |
146 | break; | |
147 | case MTD_ROM: | |
148 | type = "rom"; | |
149 | break; | |
150 | case MTD_NORFLASH: | |
151 | type = "nor"; | |
152 | break; | |
153 | case MTD_NANDFLASH: | |
154 | type = "nand"; | |
155 | break; | |
156 | case MTD_DATAFLASH: | |
157 | type = "dataflash"; | |
158 | break; | |
159 | case MTD_UBIVOLUME: | |
160 | type = "ubi"; | |
161 | break; | |
162 | default: | |
163 | type = "unknown"; | |
164 | } | |
165 | ||
166 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
167 | } | |
694bb7fc KC |
168 | static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); |
169 | ||
170 | static ssize_t mtd_flags_show(struct device *dev, | |
171 | struct device_attribute *attr, char *buf) | |
172 | { | |
d5de20a9 | 173 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
174 | |
175 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); | |
176 | ||
177 | } | |
178 | static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); | |
179 | ||
180 | static ssize_t mtd_size_show(struct device *dev, | |
181 | struct device_attribute *attr, char *buf) | |
182 | { | |
d5de20a9 | 183 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
184 | |
185 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
186 | (unsigned long long)mtd->size); | |
187 | ||
188 | } | |
189 | static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); | |
190 | ||
191 | static ssize_t mtd_erasesize_show(struct device *dev, | |
192 | struct device_attribute *attr, char *buf) | |
193 | { | |
d5de20a9 | 194 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
195 | |
196 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); | |
197 | ||
198 | } | |
199 | static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); | |
200 | ||
201 | static ssize_t mtd_writesize_show(struct device *dev, | |
202 | struct device_attribute *attr, char *buf) | |
203 | { | |
d5de20a9 | 204 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
205 | |
206 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); | |
207 | ||
208 | } | |
209 | static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); | |
210 | ||
e7693548 AB |
211 | static ssize_t mtd_subpagesize_show(struct device *dev, |
212 | struct device_attribute *attr, char *buf) | |
213 | { | |
d5de20a9 | 214 | struct mtd_info *mtd = dev_get_drvdata(dev); |
e7693548 AB |
215 | unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; |
216 | ||
217 | return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); | |
218 | ||
219 | } | |
220 | static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); | |
221 | ||
694bb7fc KC |
222 | static ssize_t mtd_oobsize_show(struct device *dev, |
223 | struct device_attribute *attr, char *buf) | |
224 | { | |
d5de20a9 | 225 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
226 | |
227 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); | |
228 | ||
229 | } | |
230 | static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); | |
231 | ||
232 | static ssize_t mtd_numeraseregions_show(struct device *dev, | |
233 | struct device_attribute *attr, char *buf) | |
234 | { | |
d5de20a9 | 235 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
236 | |
237 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); | |
238 | ||
239 | } | |
240 | static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, | |
241 | NULL); | |
242 | ||
243 | static ssize_t mtd_name_show(struct device *dev, | |
244 | struct device_attribute *attr, char *buf) | |
245 | { | |
d5de20a9 | 246 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
247 | |
248 | return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); | |
249 | ||
250 | } | |
251 | static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); | |
1f24b5a8 | 252 | |
a9b672e8 MD |
253 | static ssize_t mtd_ecc_strength_show(struct device *dev, |
254 | struct device_attribute *attr, char *buf) | |
255 | { | |
256 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
257 | ||
258 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength); | |
259 | } | |
260 | static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL); | |
261 | ||
d062d4ed MD |
262 | static ssize_t mtd_bitflip_threshold_show(struct device *dev, |
263 | struct device_attribute *attr, | |
264 | char *buf) | |
265 | { | |
266 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
267 | ||
268 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->bitflip_threshold); | |
269 | } | |
270 | ||
271 | static ssize_t mtd_bitflip_threshold_store(struct device *dev, | |
272 | struct device_attribute *attr, | |
273 | const char *buf, size_t count) | |
274 | { | |
275 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
276 | unsigned int bitflip_threshold; | |
277 | int retval; | |
278 | ||
279 | retval = kstrtouint(buf, 0, &bitflip_threshold); | |
280 | if (retval) | |
281 | return retval; | |
282 | ||
283 | mtd->bitflip_threshold = bitflip_threshold; | |
284 | return count; | |
285 | } | |
286 | static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR, | |
287 | mtd_bitflip_threshold_show, | |
288 | mtd_bitflip_threshold_store); | |
289 | ||
1f24b5a8 | 290 | static struct attribute *mtd_attrs[] = { |
694bb7fc KC |
291 | &dev_attr_type.attr, |
292 | &dev_attr_flags.attr, | |
293 | &dev_attr_size.attr, | |
294 | &dev_attr_erasesize.attr, | |
295 | &dev_attr_writesize.attr, | |
e7693548 | 296 | &dev_attr_subpagesize.attr, |
694bb7fc KC |
297 | &dev_attr_oobsize.attr, |
298 | &dev_attr_numeraseregions.attr, | |
299 | &dev_attr_name.attr, | |
a9b672e8 | 300 | &dev_attr_ecc_strength.attr, |
d062d4ed | 301 | &dev_attr_bitflip_threshold.attr, |
1f24b5a8 DB |
302 | NULL, |
303 | }; | |
304 | ||
fca91088 | 305 | static struct attribute_group mtd_group = { |
1f24b5a8 DB |
306 | .attrs = mtd_attrs, |
307 | }; | |
308 | ||
6469f540 | 309 | static const struct attribute_group *mtd_groups[] = { |
1f24b5a8 DB |
310 | &mtd_group, |
311 | NULL, | |
312 | }; | |
313 | ||
314 | static struct device_type mtd_devtype = { | |
315 | .name = "mtd", | |
316 | .groups = mtd_groups, | |
317 | .release = mtd_release, | |
318 | }; | |
319 | ||
1da177e4 LT |
320 | /** |
321 | * add_mtd_device - register an MTD device | |
322 | * @mtd: pointer to new MTD device info structure | |
323 | * | |
324 | * Add a device to the list of MTD devices present in the system, and | |
325 | * notify each currently active MTD 'user' of its arrival. Returns | |
326 | * zero on success or 1 on failure, which currently will only happen | |
b520e412 | 327 | * if there is insufficient memory or a sysfs error. |
1da177e4 LT |
328 | */ |
329 | ||
330 | int add_mtd_device(struct mtd_info *mtd) | |
331 | { | |
b520e412 BH |
332 | struct mtd_notifier *not; |
333 | int i, error; | |
1da177e4 | 334 | |
402d3265 DH |
335 | if (!mtd->backing_dev_info) { |
336 | switch (mtd->type) { | |
337 | case MTD_RAM: | |
338 | mtd->backing_dev_info = &mtd_bdi_rw_mappable; | |
339 | break; | |
340 | case MTD_ROM: | |
341 | mtd->backing_dev_info = &mtd_bdi_ro_mappable; | |
342 | break; | |
343 | default: | |
344 | mtd->backing_dev_info = &mtd_bdi_unmappable; | |
345 | break; | |
346 | } | |
347 | } | |
348 | ||
783ed81f | 349 | BUG_ON(mtd->writesize == 0); |
48b19268 | 350 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 351 | |
589e9c4d TH |
352 | i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); |
353 | if (i < 0) | |
b520e412 | 354 | goto fail_locked; |
1f24b5a8 | 355 | |
b520e412 BH |
356 | mtd->index = i; |
357 | mtd->usecount = 0; | |
358 | ||
d062d4ed MD |
359 | /* default value if not set by driver */ |
360 | if (mtd->bitflip_threshold == 0) | |
361 | mtd->bitflip_threshold = mtd->ecc_strength; | |
362 | ||
b520e412 BH |
363 | if (is_power_of_2(mtd->erasesize)) |
364 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; | |
365 | else | |
366 | mtd->erasesize_shift = 0; | |
367 | ||
368 | if (is_power_of_2(mtd->writesize)) | |
369 | mtd->writesize_shift = ffs(mtd->writesize) - 1; | |
370 | else | |
371 | mtd->writesize_shift = 0; | |
372 | ||
373 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; | |
374 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; | |
375 | ||
376 | /* Some chips always power up locked. Unlock them now */ | |
38134565 AB |
377 | if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { |
378 | error = mtd_unlock(mtd, 0, mtd->size); | |
379 | if (error && error != -EOPNOTSUPP) | |
b520e412 BH |
380 | printk(KERN_WARNING |
381 | "%s: unlock failed, writes may not work\n", | |
382 | mtd->name); | |
383 | } | |
384 | ||
385 | /* Caller should have set dev.parent to match the | |
386 | * physical device. | |
387 | */ | |
388 | mtd->dev.type = &mtd_devtype; | |
389 | mtd->dev.class = &mtd_class; | |
390 | mtd->dev.devt = MTD_DEVT(i); | |
391 | dev_set_name(&mtd->dev, "mtd%d", i); | |
392 | dev_set_drvdata(&mtd->dev, mtd); | |
393 | if (device_register(&mtd->dev) != 0) | |
394 | goto fail_added; | |
395 | ||
396 | if (MTD_DEVT(i)) | |
397 | device_create(&mtd_class, mtd->dev.parent, | |
398 | MTD_DEVT(i) + 1, | |
399 | NULL, "mtd%dro", i); | |
400 | ||
289c0522 | 401 | pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); |
b520e412 BH |
402 | /* No need to get a refcount on the module containing |
403 | the notifier, since we hold the mtd_table_mutex */ | |
404 | list_for_each_entry(not, &mtd_notifiers, list) | |
405 | not->add(mtd); | |
406 | ||
407 | mutex_unlock(&mtd_table_mutex); | |
408 | /* We _know_ we aren't being removed, because | |
409 | our caller is still holding us here. So none | |
410 | of this try_ nonsense, and no bitching about it | |
411 | either. :) */ | |
412 | __module_get(THIS_MODULE); | |
413 | return 0; | |
97894cda | 414 | |
b520e412 BH |
415 | fail_added: |
416 | idr_remove(&mtd_idr, i); | |
417 | fail_locked: | |
48b19268 | 418 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
419 | return 1; |
420 | } | |
421 | ||
422 | /** | |
423 | * del_mtd_device - unregister an MTD device | |
424 | * @mtd: pointer to MTD device info structure | |
425 | * | |
426 | * Remove a device from the list of MTD devices present in the system, | |
427 | * and notify each currently active MTD 'user' of its departure. | |
428 | * Returns zero on success or 1 on failure, which currently will happen | |
429 | * if the requested device does not appear to be present in the list. | |
430 | */ | |
431 | ||
eea72d5f | 432 | int del_mtd_device(struct mtd_info *mtd) |
1da177e4 LT |
433 | { |
434 | int ret; | |
75c0b84d | 435 | struct mtd_notifier *not; |
97894cda | 436 | |
48b19268 | 437 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 438 | |
b520e412 | 439 | if (idr_find(&mtd_idr, mtd->index) != mtd) { |
1da177e4 | 440 | ret = -ENODEV; |
75c0b84d ML |
441 | goto out_error; |
442 | } | |
443 | ||
444 | /* No need to get a refcount on the module containing | |
445 | the notifier, since we hold the mtd_table_mutex */ | |
446 | list_for_each_entry(not, &mtd_notifiers, list) | |
447 | not->remove(mtd); | |
448 | ||
449 | if (mtd->usecount) { | |
97894cda | 450 | printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", |
1da177e4 LT |
451 | mtd->index, mtd->name, mtd->usecount); |
452 | ret = -EBUSY; | |
453 | } else { | |
694bb7fc KC |
454 | device_unregister(&mtd->dev); |
455 | ||
b520e412 | 456 | idr_remove(&mtd_idr, mtd->index); |
1da177e4 LT |
457 | |
458 | module_put(THIS_MODULE); | |
459 | ret = 0; | |
460 | } | |
461 | ||
75c0b84d | 462 | out_error: |
48b19268 | 463 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
464 | return ret; |
465 | } | |
466 | ||
1c4c215c DES |
467 | /** |
468 | * mtd_device_parse_register - parse partitions and register an MTD device. | |
469 | * | |
470 | * @mtd: the MTD device to register | |
471 | * @types: the list of MTD partition probes to try, see | |
472 | * 'parse_mtd_partitions()' for more information | |
c7975330 | 473 | * @parser_data: MTD partition parser-specific data |
1c4c215c DES |
474 | * @parts: fallback partition information to register, if parsing fails; |
475 | * only valid if %nr_parts > %0 | |
476 | * @nr_parts: the number of partitions in parts, if zero then the full | |
477 | * MTD device is registered if no partition info is found | |
478 | * | |
479 | * This function aggregates MTD partitions parsing (done by | |
480 | * 'parse_mtd_partitions()') and MTD device and partitions registering. It | |
481 | * basically follows the most common pattern found in many MTD drivers: | |
482 | * | |
483 | * * It first tries to probe partitions on MTD device @mtd using parsers | |
484 | * specified in @types (if @types is %NULL, then the default list of parsers | |
485 | * is used, see 'parse_mtd_partitions()' for more information). If none are | |
486 | * found this functions tries to fallback to information specified in | |
487 | * @parts/@nr_parts. | |
92394b5c | 488 | * * If any partitioning info was found, this function registers the found |
1c4c215c DES |
489 | * partitions. |
490 | * * If no partitions were found this function just registers the MTD device | |
491 | * @mtd and exits. | |
492 | * | |
493 | * Returns zero in case of success and a negative error code in case of failure. | |
494 | */ | |
495 | int mtd_device_parse_register(struct mtd_info *mtd, const char **types, | |
c7975330 | 496 | struct mtd_part_parser_data *parser_data, |
1c4c215c DES |
497 | const struct mtd_partition *parts, |
498 | int nr_parts) | |
499 | { | |
500 | int err; | |
501 | struct mtd_partition *real_parts; | |
502 | ||
c7975330 | 503 | err = parse_mtd_partitions(mtd, types, &real_parts, parser_data); |
4d523b60 | 504 | if (err <= 0 && nr_parts && parts) { |
1c4c215c DES |
505 | real_parts = kmemdup(parts, sizeof(*parts) * nr_parts, |
506 | GFP_KERNEL); | |
4d523b60 | 507 | if (!real_parts) |
1c4c215c | 508 | err = -ENOMEM; |
4d523b60 JL |
509 | else |
510 | err = nr_parts; | |
1c4c215c DES |
511 | } |
512 | ||
513 | if (err > 0) { | |
514 | err = add_mtd_partitions(mtd, real_parts, err); | |
515 | kfree(real_parts); | |
516 | } else if (err == 0) { | |
517 | err = add_mtd_device(mtd); | |
518 | if (err == 1) | |
519 | err = -ENODEV; | |
520 | } | |
521 | ||
522 | return err; | |
523 | } | |
524 | EXPORT_SYMBOL_GPL(mtd_device_parse_register); | |
525 | ||
f5671ab3 JI |
526 | /** |
527 | * mtd_device_unregister - unregister an existing MTD device. | |
528 | * | |
529 | * @master: the MTD device to unregister. This will unregister both the master | |
530 | * and any partitions if registered. | |
531 | */ | |
532 | int mtd_device_unregister(struct mtd_info *master) | |
533 | { | |
534 | int err; | |
535 | ||
536 | err = del_mtd_partitions(master); | |
537 | if (err) | |
538 | return err; | |
539 | ||
540 | if (!device_is_registered(&master->dev)) | |
541 | return 0; | |
542 | ||
543 | return del_mtd_device(master); | |
544 | } | |
545 | EXPORT_SYMBOL_GPL(mtd_device_unregister); | |
546 | ||
1da177e4 LT |
547 | /** |
548 | * register_mtd_user - register a 'user' of MTD devices. | |
549 | * @new: pointer to notifier info structure | |
550 | * | |
551 | * Registers a pair of callbacks function to be called upon addition | |
552 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
553 | * invoked for each MTD device currently present in the system. | |
554 | */ | |
1da177e4 LT |
555 | void register_mtd_user (struct mtd_notifier *new) |
556 | { | |
f1332ba2 | 557 | struct mtd_info *mtd; |
1da177e4 | 558 | |
48b19268 | 559 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
560 | |
561 | list_add(&new->list, &mtd_notifiers); | |
562 | ||
d5ca5129 | 563 | __module_get(THIS_MODULE); |
97894cda | 564 | |
f1332ba2 BH |
565 | mtd_for_each_device(mtd) |
566 | new->add(mtd); | |
1da177e4 | 567 | |
48b19268 | 568 | mutex_unlock(&mtd_table_mutex); |
1da177e4 | 569 | } |
33c87b4a | 570 | EXPORT_SYMBOL_GPL(register_mtd_user); |
1da177e4 LT |
571 | |
572 | /** | |
49450795 AB |
573 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
574 | * @old: pointer to notifier info structure | |
1da177e4 LT |
575 | * |
576 | * Removes a callback function pair from the list of 'users' to be | |
577 | * notified upon addition or removal of MTD devices. Causes the | |
578 | * 'remove' callback to be immediately invoked for each MTD device | |
579 | * currently present in the system. | |
580 | */ | |
1da177e4 LT |
581 | int unregister_mtd_user (struct mtd_notifier *old) |
582 | { | |
f1332ba2 | 583 | struct mtd_info *mtd; |
1da177e4 | 584 | |
48b19268 | 585 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
586 | |
587 | module_put(THIS_MODULE); | |
588 | ||
f1332ba2 BH |
589 | mtd_for_each_device(mtd) |
590 | old->remove(mtd); | |
97894cda | 591 | |
1da177e4 | 592 | list_del(&old->list); |
48b19268 | 593 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
594 | return 0; |
595 | } | |
33c87b4a | 596 | EXPORT_SYMBOL_GPL(unregister_mtd_user); |
1da177e4 LT |
597 | |
598 | /** | |
599 | * get_mtd_device - obtain a validated handle for an MTD device | |
600 | * @mtd: last known address of the required MTD device | |
601 | * @num: internal device number of the required MTD device | |
602 | * | |
603 | * Given a number and NULL address, return the num'th entry in the device | |
604 | * table, if any. Given an address and num == -1, search the device table | |
605 | * for a device with that address and return if it's still present. Given | |
9c74034f AB |
606 | * both, return the num'th driver only if its address matches. Return |
607 | * error code if not. | |
1da177e4 | 608 | */ |
1da177e4 LT |
609 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
610 | { | |
f1332ba2 BH |
611 | struct mtd_info *ret = NULL, *other; |
612 | int err = -ENODEV; | |
1da177e4 | 613 | |
48b19268 | 614 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
615 | |
616 | if (num == -1) { | |
f1332ba2 BH |
617 | mtd_for_each_device(other) { |
618 | if (other == mtd) { | |
619 | ret = mtd; | |
620 | break; | |
621 | } | |
622 | } | |
b520e412 BH |
623 | } else if (num >= 0) { |
624 | ret = idr_find(&mtd_idr, num); | |
1da177e4 LT |
625 | if (mtd && mtd != ret) |
626 | ret = NULL; | |
627 | } | |
628 | ||
3bd45657 ML |
629 | if (!ret) { |
630 | ret = ERR_PTR(err); | |
631 | goto out; | |
9fe912ce | 632 | } |
1da177e4 | 633 | |
3bd45657 ML |
634 | err = __get_mtd_device(ret); |
635 | if (err) | |
636 | ret = ERR_PTR(err); | |
637 | out: | |
9c74034f AB |
638 | mutex_unlock(&mtd_table_mutex); |
639 | return ret; | |
3bd45657 | 640 | } |
33c87b4a | 641 | EXPORT_SYMBOL_GPL(get_mtd_device); |
1da177e4 | 642 | |
3bd45657 ML |
643 | |
644 | int __get_mtd_device(struct mtd_info *mtd) | |
645 | { | |
646 | int err; | |
647 | ||
648 | if (!try_module_get(mtd->owner)) | |
649 | return -ENODEV; | |
650 | ||
3c3c10bb AB |
651 | if (mtd->_get_device) { |
652 | err = mtd->_get_device(mtd); | |
3bd45657 ML |
653 | |
654 | if (err) { | |
655 | module_put(mtd->owner); | |
656 | return err; | |
657 | } | |
658 | } | |
659 | mtd->usecount++; | |
660 | return 0; | |
1da177e4 | 661 | } |
33c87b4a | 662 | EXPORT_SYMBOL_GPL(__get_mtd_device); |
1da177e4 | 663 | |
7799308f AB |
664 | /** |
665 | * get_mtd_device_nm - obtain a validated handle for an MTD device by | |
666 | * device name | |
667 | * @name: MTD device name to open | |
668 | * | |
669 | * This function returns MTD device description structure in case of | |
670 | * success and an error code in case of failure. | |
671 | */ | |
7799308f AB |
672 | struct mtd_info *get_mtd_device_nm(const char *name) |
673 | { | |
f1332ba2 BH |
674 | int err = -ENODEV; |
675 | struct mtd_info *mtd = NULL, *other; | |
7799308f AB |
676 | |
677 | mutex_lock(&mtd_table_mutex); | |
678 | ||
f1332ba2 BH |
679 | mtd_for_each_device(other) { |
680 | if (!strcmp(name, other->name)) { | |
681 | mtd = other; | |
7799308f AB |
682 | break; |
683 | } | |
684 | } | |
685 | ||
9fe912ce | 686 | if (!mtd) |
7799308f AB |
687 | goto out_unlock; |
688 | ||
52534f2d WG |
689 | err = __get_mtd_device(mtd); |
690 | if (err) | |
7799308f AB |
691 | goto out_unlock; |
692 | ||
9fe912ce AB |
693 | mutex_unlock(&mtd_table_mutex); |
694 | return mtd; | |
7799308f AB |
695 | |
696 | out_unlock: | |
697 | mutex_unlock(&mtd_table_mutex); | |
9fe912ce | 698 | return ERR_PTR(err); |
7799308f | 699 | } |
33c87b4a | 700 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); |
7799308f | 701 | |
1da177e4 LT |
702 | void put_mtd_device(struct mtd_info *mtd) |
703 | { | |
48b19268 | 704 | mutex_lock(&mtd_table_mutex); |
3bd45657 ML |
705 | __put_mtd_device(mtd); |
706 | mutex_unlock(&mtd_table_mutex); | |
707 | ||
708 | } | |
33c87b4a | 709 | EXPORT_SYMBOL_GPL(put_mtd_device); |
3bd45657 ML |
710 | |
711 | void __put_mtd_device(struct mtd_info *mtd) | |
712 | { | |
713 | --mtd->usecount; | |
714 | BUG_ON(mtd->usecount < 0); | |
715 | ||
3c3c10bb AB |
716 | if (mtd->_put_device) |
717 | mtd->_put_device(mtd); | |
1da177e4 LT |
718 | |
719 | module_put(mtd->owner); | |
720 | } | |
33c87b4a | 721 | EXPORT_SYMBOL_GPL(__put_mtd_device); |
1da177e4 | 722 | |
8273a0c9 AB |
723 | /* |
724 | * Erase is an asynchronous operation. Device drivers are supposed | |
725 | * to call instr->callback() whenever the operation completes, even | |
726 | * if it completes with a failure. | |
727 | * Callers are supposed to pass a callback function and wait for it | |
728 | * to be called before writing to the block. | |
729 | */ | |
730 | int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) | |
731 | { | |
732 | if (instr->addr > mtd->size || instr->len > mtd->size - instr->addr) | |
733 | return -EINVAL; | |
664addc2 AB |
734 | if (!(mtd->flags & MTD_WRITEABLE)) |
735 | return -EROFS; | |
3b27dac0 | 736 | instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; |
bcb1d238 AB |
737 | if (!instr->len) { |
738 | instr->state = MTD_ERASE_DONE; | |
739 | mtd_erase_callback(instr); | |
740 | return 0; | |
741 | } | |
8273a0c9 AB |
742 | return mtd->_erase(mtd, instr); |
743 | } | |
744 | EXPORT_SYMBOL_GPL(mtd_erase); | |
745 | ||
746 | /* | |
747 | * This stuff for eXecute-In-Place. phys is optional and may be set to NULL. | |
748 | */ | |
749 | int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
750 | void **virt, resource_size_t *phys) | |
751 | { | |
752 | *retlen = 0; | |
0dd5235f AB |
753 | *virt = NULL; |
754 | if (phys) | |
755 | *phys = 0; | |
8273a0c9 AB |
756 | if (!mtd->_point) |
757 | return -EOPNOTSUPP; | |
758 | if (from < 0 || from > mtd->size || len > mtd->size - from) | |
759 | return -EINVAL; | |
bcb1d238 AB |
760 | if (!len) |
761 | return 0; | |
8273a0c9 AB |
762 | return mtd->_point(mtd, from, len, retlen, virt, phys); |
763 | } | |
764 | EXPORT_SYMBOL_GPL(mtd_point); | |
765 | ||
766 | /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ | |
767 | int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len) | |
768 | { | |
769 | if (!mtd->_point) | |
770 | return -EOPNOTSUPP; | |
771 | if (from < 0 || from > mtd->size || len > mtd->size - from) | |
772 | return -EINVAL; | |
bcb1d238 AB |
773 | if (!len) |
774 | return 0; | |
8273a0c9 AB |
775 | return mtd->_unpoint(mtd, from, len); |
776 | } | |
777 | EXPORT_SYMBOL_GPL(mtd_unpoint); | |
778 | ||
779 | /* | |
780 | * Allow NOMMU mmap() to directly map the device (if not NULL) | |
781 | * - return the address to which the offset maps | |
782 | * - return -ENOSYS to indicate refusal to do the mapping | |
783 | */ | |
784 | unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, | |
785 | unsigned long offset, unsigned long flags) | |
786 | { | |
787 | if (!mtd->_get_unmapped_area) | |
788 | return -EOPNOTSUPP; | |
789 | if (offset > mtd->size || len > mtd->size - offset) | |
790 | return -EINVAL; | |
791 | return mtd->_get_unmapped_area(mtd, len, offset, flags); | |
792 | } | |
793 | EXPORT_SYMBOL_GPL(mtd_get_unmapped_area); | |
794 | ||
795 | int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
796 | u_char *buf) | |
797 | { | |
edbc4540 | 798 | int ret_code; |
834247ec | 799 | *retlen = 0; |
8273a0c9 AB |
800 | if (from < 0 || from > mtd->size || len > mtd->size - from) |
801 | return -EINVAL; | |
bcb1d238 AB |
802 | if (!len) |
803 | return 0; | |
edbc4540 MD |
804 | |
805 | /* | |
806 | * In the absence of an error, drivers return a non-negative integer | |
807 | * representing the maximum number of bitflips that were corrected on | |
808 | * any one ecc region (if applicable; zero otherwise). | |
809 | */ | |
810 | ret_code = mtd->_read(mtd, from, len, retlen, buf); | |
811 | if (unlikely(ret_code < 0)) | |
812 | return ret_code; | |
813 | if (mtd->ecc_strength == 0) | |
814 | return 0; /* device lacks ecc */ | |
815 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; | |
8273a0c9 AB |
816 | } |
817 | EXPORT_SYMBOL_GPL(mtd_read); | |
818 | ||
819 | int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
820 | const u_char *buf) | |
821 | { | |
822 | *retlen = 0; | |
8273a0c9 AB |
823 | if (to < 0 || to > mtd->size || len > mtd->size - to) |
824 | return -EINVAL; | |
664addc2 AB |
825 | if (!mtd->_write || !(mtd->flags & MTD_WRITEABLE)) |
826 | return -EROFS; | |
bcb1d238 AB |
827 | if (!len) |
828 | return 0; | |
8273a0c9 AB |
829 | return mtd->_write(mtd, to, len, retlen, buf); |
830 | } | |
831 | EXPORT_SYMBOL_GPL(mtd_write); | |
832 | ||
833 | /* | |
834 | * In blackbox flight recorder like scenarios we want to make successful writes | |
835 | * in interrupt context. panic_write() is only intended to be called when its | |
836 | * known the kernel is about to panic and we need the write to succeed. Since | |
837 | * the kernel is not going to be running for much longer, this function can | |
838 | * break locks and delay to ensure the write succeeds (but not sleep). | |
839 | */ | |
840 | int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
841 | const u_char *buf) | |
842 | { | |
843 | *retlen = 0; | |
844 | if (!mtd->_panic_write) | |
845 | return -EOPNOTSUPP; | |
846 | if (to < 0 || to > mtd->size || len > mtd->size - to) | |
847 | return -EINVAL; | |
664addc2 AB |
848 | if (!(mtd->flags & MTD_WRITEABLE)) |
849 | return -EROFS; | |
bcb1d238 AB |
850 | if (!len) |
851 | return 0; | |
8273a0c9 AB |
852 | return mtd->_panic_write(mtd, to, len, retlen, buf); |
853 | } | |
854 | EXPORT_SYMBOL_GPL(mtd_panic_write); | |
855 | ||
d2d48480 BN |
856 | int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) |
857 | { | |
e47f6858 | 858 | int ret_code; |
d2d48480 BN |
859 | ops->retlen = ops->oobretlen = 0; |
860 | if (!mtd->_read_oob) | |
861 | return -EOPNOTSUPP; | |
e47f6858 BN |
862 | /* |
863 | * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics | |
864 | * similar to mtd->_read(), returning a non-negative integer | |
865 | * representing max bitflips. In other cases, mtd->_read_oob() may | |
866 | * return -EUCLEAN. In all cases, perform similar logic to mtd_read(). | |
867 | */ | |
868 | ret_code = mtd->_read_oob(mtd, from, ops); | |
869 | if (unlikely(ret_code < 0)) | |
870 | return ret_code; | |
871 | if (mtd->ecc_strength == 0) | |
872 | return 0; /* device lacks ecc */ | |
873 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; | |
d2d48480 BN |
874 | } |
875 | EXPORT_SYMBOL_GPL(mtd_read_oob); | |
876 | ||
de3cac93 AB |
877 | /* |
878 | * Method to access the protection register area, present in some flash | |
879 | * devices. The user data is one time programmable but the factory data is read | |
880 | * only. | |
881 | */ | |
882 | int mtd_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf, | |
883 | size_t len) | |
884 | { | |
885 | if (!mtd->_get_fact_prot_info) | |
886 | return -EOPNOTSUPP; | |
887 | if (!len) | |
888 | return 0; | |
889 | return mtd->_get_fact_prot_info(mtd, buf, len); | |
890 | } | |
891 | EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info); | |
892 | ||
893 | int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
894 | size_t *retlen, u_char *buf) | |
895 | { | |
896 | *retlen = 0; | |
897 | if (!mtd->_read_fact_prot_reg) | |
898 | return -EOPNOTSUPP; | |
899 | if (!len) | |
900 | return 0; | |
901 | return mtd->_read_fact_prot_reg(mtd, from, len, retlen, buf); | |
902 | } | |
903 | EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg); | |
904 | ||
905 | int mtd_get_user_prot_info(struct mtd_info *mtd, struct otp_info *buf, | |
906 | size_t len) | |
907 | { | |
908 | if (!mtd->_get_user_prot_info) | |
909 | return -EOPNOTSUPP; | |
910 | if (!len) | |
911 | return 0; | |
912 | return mtd->_get_user_prot_info(mtd, buf, len); | |
913 | } | |
914 | EXPORT_SYMBOL_GPL(mtd_get_user_prot_info); | |
915 | ||
916 | int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
917 | size_t *retlen, u_char *buf) | |
918 | { | |
919 | *retlen = 0; | |
920 | if (!mtd->_read_user_prot_reg) | |
921 | return -EOPNOTSUPP; | |
922 | if (!len) | |
923 | return 0; | |
924 | return mtd->_read_user_prot_reg(mtd, from, len, retlen, buf); | |
925 | } | |
926 | EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg); | |
927 | ||
928 | int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, | |
929 | size_t *retlen, u_char *buf) | |
930 | { | |
931 | *retlen = 0; | |
932 | if (!mtd->_write_user_prot_reg) | |
933 | return -EOPNOTSUPP; | |
934 | if (!len) | |
935 | return 0; | |
936 | return mtd->_write_user_prot_reg(mtd, to, len, retlen, buf); | |
937 | } | |
938 | EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg); | |
939 | ||
940 | int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) | |
941 | { | |
942 | if (!mtd->_lock_user_prot_reg) | |
943 | return -EOPNOTSUPP; | |
944 | if (!len) | |
945 | return 0; | |
946 | return mtd->_lock_user_prot_reg(mtd, from, len); | |
947 | } | |
948 | EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg); | |
949 | ||
8273a0c9 AB |
950 | /* Chip-supported device locking */ |
951 | int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
952 | { | |
953 | if (!mtd->_lock) | |
954 | return -EOPNOTSUPP; | |
955 | if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) | |
956 | return -EINVAL; | |
bcb1d238 AB |
957 | if (!len) |
958 | return 0; | |
8273a0c9 AB |
959 | return mtd->_lock(mtd, ofs, len); |
960 | } | |
961 | EXPORT_SYMBOL_GPL(mtd_lock); | |
962 | ||
963 | int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
964 | { | |
965 | if (!mtd->_unlock) | |
966 | return -EOPNOTSUPP; | |
967 | if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) | |
968 | return -EINVAL; | |
bcb1d238 AB |
969 | if (!len) |
970 | return 0; | |
8273a0c9 AB |
971 | return mtd->_unlock(mtd, ofs, len); |
972 | } | |
973 | EXPORT_SYMBOL_GPL(mtd_unlock); | |
974 | ||
975 | int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
976 | { | |
977 | if (!mtd->_is_locked) | |
978 | return -EOPNOTSUPP; | |
979 | if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) | |
980 | return -EINVAL; | |
bcb1d238 AB |
981 | if (!len) |
982 | return 0; | |
8273a0c9 AB |
983 | return mtd->_is_locked(mtd, ofs, len); |
984 | } | |
985 | EXPORT_SYMBOL_GPL(mtd_is_locked); | |
986 | ||
987 | int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) | |
988 | { | |
989 | if (!mtd->_block_isbad) | |
990 | return 0; | |
991 | if (ofs < 0 || ofs > mtd->size) | |
992 | return -EINVAL; | |
993 | return mtd->_block_isbad(mtd, ofs); | |
994 | } | |
995 | EXPORT_SYMBOL_GPL(mtd_block_isbad); | |
996 | ||
997 | int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
998 | { | |
999 | if (!mtd->_block_markbad) | |
1000 | return -EOPNOTSUPP; | |
1001 | if (ofs < 0 || ofs > mtd->size) | |
1002 | return -EINVAL; | |
664addc2 AB |
1003 | if (!(mtd->flags & MTD_WRITEABLE)) |
1004 | return -EROFS; | |
8273a0c9 AB |
1005 | return mtd->_block_markbad(mtd, ofs); |
1006 | } | |
1007 | EXPORT_SYMBOL_GPL(mtd_block_markbad); | |
1008 | ||
52b02031 AB |
1009 | /* |
1010 | * default_mtd_writev - the default writev method | |
1011 | * @mtd: mtd device description object pointer | |
1012 | * @vecs: the vectors to write | |
1013 | * @count: count of vectors in @vecs | |
1014 | * @to: the MTD device offset to write to | |
1015 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
1016 | * | |
1017 | * This function returns zero in case of success and a negative error code in | |
1018 | * case of failure. | |
1da177e4 | 1019 | */ |
1dbebd32 AB |
1020 | static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, |
1021 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 LT |
1022 | { |
1023 | unsigned long i; | |
1024 | size_t totlen = 0, thislen; | |
1025 | int ret = 0; | |
1026 | ||
52b02031 AB |
1027 | for (i = 0; i < count; i++) { |
1028 | if (!vecs[i].iov_len) | |
1029 | continue; | |
1030 | ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen, | |
1031 | vecs[i].iov_base); | |
1032 | totlen += thislen; | |
1033 | if (ret || thislen != vecs[i].iov_len) | |
1034 | break; | |
1035 | to += vecs[i].iov_len; | |
1da177e4 | 1036 | } |
52b02031 | 1037 | *retlen = totlen; |
1da177e4 LT |
1038 | return ret; |
1039 | } | |
1dbebd32 AB |
1040 | |
1041 | /* | |
1042 | * mtd_writev - the vector-based MTD write method | |
1043 | * @mtd: mtd device description object pointer | |
1044 | * @vecs: the vectors to write | |
1045 | * @count: count of vectors in @vecs | |
1046 | * @to: the MTD device offset to write to | |
1047 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
1048 | * | |
1049 | * This function returns zero in case of success and a negative error code in | |
1050 | * case of failure. | |
1051 | */ | |
1052 | int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
1053 | unsigned long count, loff_t to, size_t *retlen) | |
1054 | { | |
1055 | *retlen = 0; | |
664addc2 AB |
1056 | if (!(mtd->flags & MTD_WRITEABLE)) |
1057 | return -EROFS; | |
3c3c10bb | 1058 | if (!mtd->_writev) |
1dbebd32 | 1059 | return default_mtd_writev(mtd, vecs, count, to, retlen); |
3c3c10bb | 1060 | return mtd->_writev(mtd, vecs, count, to, retlen); |
1dbebd32 AB |
1061 | } |
1062 | EXPORT_SYMBOL_GPL(mtd_writev); | |
1da177e4 | 1063 | |
33b53716 GE |
1064 | /** |
1065 | * mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size | |
52b02031 AB |
1066 | * @mtd: mtd device description object pointer |
1067 | * @size: a pointer to the ideal or maximum size of the allocation, points | |
33b53716 GE |
1068 | * to the actual allocation size on success. |
1069 | * | |
1070 | * This routine attempts to allocate a contiguous kernel buffer up to | |
1071 | * the specified size, backing off the size of the request exponentially | |
1072 | * until the request succeeds or until the allocation size falls below | |
1073 | * the system page size. This attempts to make sure it does not adversely | |
1074 | * impact system performance, so when allocating more than one page, we | |
caf49191 LT |
1075 | * ask the memory allocator to avoid re-trying, swapping, writing back |
1076 | * or performing I/O. | |
33b53716 GE |
1077 | * |
1078 | * Note, this function also makes sure that the allocated buffer is aligned to | |
1079 | * the MTD device's min. I/O unit, i.e. the "mtd->writesize" value. | |
1080 | * | |
1081 | * This is called, for example by mtd_{read,write} and jffs2_scan_medium, | |
1082 | * to handle smaller (i.e. degraded) buffer allocations under low- or | |
1083 | * fragmented-memory situations where such reduced allocations, from a | |
1084 | * requested ideal, are allowed. | |
1085 | * | |
1086 | * Returns a pointer to the allocated buffer on success; otherwise, NULL. | |
1087 | */ | |
1088 | void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size) | |
1089 | { | |
caf49191 LT |
1090 | gfp_t flags = __GFP_NOWARN | __GFP_WAIT | |
1091 | __GFP_NORETRY | __GFP_NO_KSWAPD; | |
33b53716 GE |
1092 | size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE); |
1093 | void *kbuf; | |
1094 | ||
1095 | *size = min_t(size_t, *size, KMALLOC_MAX_SIZE); | |
1096 | ||
1097 | while (*size > min_alloc) { | |
1098 | kbuf = kmalloc(*size, flags); | |
1099 | if (kbuf) | |
1100 | return kbuf; | |
1101 | ||
1102 | *size >>= 1; | |
1103 | *size = ALIGN(*size, mtd->writesize); | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * For the last resort allocation allow 'kmalloc()' to do all sorts of | |
1108 | * things (write-back, dropping caches, etc) by using GFP_KERNEL. | |
1109 | */ | |
1110 | return kmalloc(*size, GFP_KERNEL); | |
1111 | } | |
33b53716 | 1112 | EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to); |
1da177e4 | 1113 | |
2d2dce0e PM |
1114 | #ifdef CONFIG_PROC_FS |
1115 | ||
1da177e4 LT |
1116 | /*====================================================================*/ |
1117 | /* Support for /proc/mtd */ | |
1118 | ||
1da177e4 LT |
1119 | static struct proc_dir_entry *proc_mtd; |
1120 | ||
447d9bd8 | 1121 | static int mtd_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1122 | { |
f1332ba2 | 1123 | struct mtd_info *mtd; |
1da177e4 | 1124 | |
447d9bd8 | 1125 | seq_puts(m, "dev: size erasesize name\n"); |
48b19268 | 1126 | mutex_lock(&mtd_table_mutex); |
f1332ba2 | 1127 | mtd_for_each_device(mtd) { |
447d9bd8 AD |
1128 | seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\"\n", |
1129 | mtd->index, (unsigned long long)mtd->size, | |
1130 | mtd->erasesize, mtd->name); | |
d5ca5129 | 1131 | } |
48b19268 | 1132 | mutex_unlock(&mtd_table_mutex); |
d5ca5129 | 1133 | return 0; |
1da177e4 LT |
1134 | } |
1135 | ||
447d9bd8 AD |
1136 | static int mtd_proc_open(struct inode *inode, struct file *file) |
1137 | { | |
1138 | return single_open(file, mtd_proc_show, NULL); | |
1139 | } | |
1140 | ||
1141 | static const struct file_operations mtd_proc_ops = { | |
1142 | .open = mtd_proc_open, | |
1143 | .read = seq_read, | |
1144 | .llseek = seq_lseek, | |
1145 | .release = single_release, | |
1146 | }; | |
45b09076 KC |
1147 | #endif /* CONFIG_PROC_FS */ |
1148 | ||
1da177e4 LT |
1149 | /*====================================================================*/ |
1150 | /* Init code */ | |
1151 | ||
0661b1ac JA |
1152 | static int __init mtd_bdi_init(struct backing_dev_info *bdi, const char *name) |
1153 | { | |
1154 | int ret; | |
1155 | ||
1156 | ret = bdi_init(bdi); | |
1157 | if (!ret) | |
1158 | ret = bdi_register(bdi, NULL, name); | |
1159 | ||
1160 | if (ret) | |
1161 | bdi_destroy(bdi); | |
1162 | ||
1163 | return ret; | |
1164 | } | |
1165 | ||
1da177e4 LT |
1166 | static int __init init_mtd(void) |
1167 | { | |
15bce40c | 1168 | int ret; |
0661b1ac | 1169 | |
15bce40c | 1170 | ret = class_register(&mtd_class); |
0661b1ac JA |
1171 | if (ret) |
1172 | goto err_reg; | |
1173 | ||
1174 | ret = mtd_bdi_init(&mtd_bdi_unmappable, "mtd-unmap"); | |
1175 | if (ret) | |
1176 | goto err_bdi1; | |
1177 | ||
1178 | ret = mtd_bdi_init(&mtd_bdi_ro_mappable, "mtd-romap"); | |
1179 | if (ret) | |
1180 | goto err_bdi2; | |
1181 | ||
1182 | ret = mtd_bdi_init(&mtd_bdi_rw_mappable, "mtd-rwmap"); | |
1183 | if (ret) | |
1184 | goto err_bdi3; | |
694bb7fc | 1185 | |
45b09076 | 1186 | #ifdef CONFIG_PROC_FS |
447d9bd8 | 1187 | proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops); |
45b09076 | 1188 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 1189 | return 0; |
0661b1ac JA |
1190 | |
1191 | err_bdi3: | |
1192 | bdi_destroy(&mtd_bdi_ro_mappable); | |
1193 | err_bdi2: | |
1194 | bdi_destroy(&mtd_bdi_unmappable); | |
1195 | err_bdi1: | |
1196 | class_unregister(&mtd_class); | |
1197 | err_reg: | |
1198 | pr_err("Error registering mtd class or bdi: %d\n", ret); | |
1199 | return ret; | |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | static void __exit cleanup_mtd(void) | |
1203 | { | |
45b09076 | 1204 | #ifdef CONFIG_PROC_FS |
d5ca5129 | 1205 | if (proc_mtd) |
1da177e4 | 1206 | remove_proc_entry( "mtd", NULL); |
45b09076 | 1207 | #endif /* CONFIG_PROC_FS */ |
15bce40c | 1208 | class_unregister(&mtd_class); |
0661b1ac JA |
1209 | bdi_destroy(&mtd_bdi_unmappable); |
1210 | bdi_destroy(&mtd_bdi_ro_mappable); | |
1211 | bdi_destroy(&mtd_bdi_rw_mappable); | |
1da177e4 LT |
1212 | } |
1213 | ||
1214 | module_init(init_mtd); | |
1215 | module_exit(cleanup_mtd); | |
1216 | ||
1da177e4 LT |
1217 | MODULE_LICENSE("GPL"); |
1218 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
1219 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |