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fd534e9b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Core registration and callback routines for MTD |
4 | * drivers and users. | |
5 | * | |
a1452a37 DW |
6 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
7 | * Copyright © 2006 Red Hat UK Limited | |
1da177e4 LT |
8 | */ |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/kernel.h> | |
1da177e4 | 12 | #include <linux/ptrace.h> |
447d9bd8 | 13 | #include <linux/seq_file.h> |
1da177e4 LT |
14 | #include <linux/string.h> |
15 | #include <linux/timer.h> | |
16 | #include <linux/major.h> | |
17 | #include <linux/fs.h> | |
7799308f | 18 | #include <linux/err.h> |
1da177e4 LT |
19 | #include <linux/ioctl.h> |
20 | #include <linux/init.h> | |
215a02fd | 21 | #include <linux/of.h> |
1da177e4 | 22 | #include <linux/proc_fs.h> |
b520e412 | 23 | #include <linux/idr.h> |
a33eb6b9 | 24 | #include <linux/backing-dev.h> |
05d71b46 | 25 | #include <linux/gfp.h> |
0d01ff25 | 26 | #include <linux/slab.h> |
3efe41be | 27 | #include <linux/reboot.h> |
fea728c0 | 28 | #include <linux/leds.h> |
e8e3edb9 | 29 | #include <linux/debugfs.h> |
c4dfa25a | 30 | #include <linux/nvmem-provider.h> |
1da177e4 LT |
31 | |
32 | #include <linux/mtd/mtd.h> | |
f5671ab3 | 33 | #include <linux/mtd/partitions.h> |
1da177e4 | 34 | |
356d70f1 | 35 | #include "mtdcore.h" |
660685d9 | 36 | |
fa06052d | 37 | struct backing_dev_info *mtd_bdi; |
356d70f1 | 38 | |
57b8045d LPC |
39 | #ifdef CONFIG_PM_SLEEP |
40 | ||
41 | static int mtd_cls_suspend(struct device *dev) | |
42 | { | |
43 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
44 | ||
45 | return mtd ? mtd_suspend(mtd) : 0; | |
46 | } | |
47 | ||
48 | static int mtd_cls_resume(struct device *dev) | |
49 | { | |
50 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
51 | ||
52 | if (mtd) | |
53 | mtd_resume(mtd); | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static SIMPLE_DEV_PM_OPS(mtd_cls_pm_ops, mtd_cls_suspend, mtd_cls_resume); | |
58 | #define MTD_CLS_PM_OPS (&mtd_cls_pm_ops) | |
59 | #else | |
60 | #define MTD_CLS_PM_OPS NULL | |
61 | #endif | |
15bce40c DW |
62 | |
63 | static struct class mtd_class = { | |
64 | .name = "mtd", | |
65 | .owner = THIS_MODULE, | |
57b8045d | 66 | .pm = MTD_CLS_PM_OPS, |
15bce40c | 67 | }; |
1f24b5a8 | 68 | |
b520e412 BH |
69 | static DEFINE_IDR(mtd_idr); |
70 | ||
97894cda | 71 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
1da177e4 | 72 | should not use them for _anything_ else */ |
48b19268 | 73 | DEFINE_MUTEX(mtd_table_mutex); |
1da177e4 | 74 | EXPORT_SYMBOL_GPL(mtd_table_mutex); |
b520e412 BH |
75 | |
76 | struct mtd_info *__mtd_next_device(int i) | |
77 | { | |
78 | return idr_get_next(&mtd_idr, &i); | |
79 | } | |
80 | EXPORT_SYMBOL_GPL(__mtd_next_device); | |
1da177e4 LT |
81 | |
82 | static LIST_HEAD(mtd_notifiers); | |
83 | ||
1f24b5a8 | 84 | |
1f24b5a8 | 85 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) |
1f24b5a8 DB |
86 | |
87 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
88 | * the mtd_info will probably want to use the release() hook... | |
89 | */ | |
90 | static void mtd_release(struct device *dev) | |
91 | { | |
5e472128 | 92 | struct mtd_info *mtd = dev_get_drvdata(dev); |
d5de20a9 | 93 | dev_t index = MTD_DEVT(mtd->index); |
1f24b5a8 | 94 | |
5e472128 BN |
95 | /* remove /dev/mtdXro node */ |
96 | device_destroy(&mtd_class, index + 1); | |
15bce40c DW |
97 | } |
98 | ||
1f24b5a8 DB |
99 | static ssize_t mtd_type_show(struct device *dev, |
100 | struct device_attribute *attr, char *buf) | |
101 | { | |
d5de20a9 | 102 | struct mtd_info *mtd = dev_get_drvdata(dev); |
1f24b5a8 DB |
103 | char *type; |
104 | ||
105 | switch (mtd->type) { | |
106 | case MTD_ABSENT: | |
107 | type = "absent"; | |
108 | break; | |
109 | case MTD_RAM: | |
110 | type = "ram"; | |
111 | break; | |
112 | case MTD_ROM: | |
113 | type = "rom"; | |
114 | break; | |
115 | case MTD_NORFLASH: | |
116 | type = "nor"; | |
117 | break; | |
118 | case MTD_NANDFLASH: | |
119 | type = "nand"; | |
120 | break; | |
121 | case MTD_DATAFLASH: | |
122 | type = "dataflash"; | |
123 | break; | |
124 | case MTD_UBIVOLUME: | |
125 | type = "ubi"; | |
126 | break; | |
f4837246 HS |
127 | case MTD_MLCNANDFLASH: |
128 | type = "mlc-nand"; | |
129 | break; | |
1f24b5a8 DB |
130 | default: |
131 | type = "unknown"; | |
132 | } | |
133 | ||
134 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
135 | } | |
694bb7fc KC |
136 | static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); |
137 | ||
138 | static ssize_t mtd_flags_show(struct device *dev, | |
139 | struct device_attribute *attr, char *buf) | |
140 | { | |
d5de20a9 | 141 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
142 | |
143 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); | |
694bb7fc KC |
144 | } |
145 | static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); | |
146 | ||
147 | static ssize_t mtd_size_show(struct device *dev, | |
148 | struct device_attribute *attr, char *buf) | |
149 | { | |
d5de20a9 | 150 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
151 | |
152 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
153 | (unsigned long long)mtd->size); | |
694bb7fc KC |
154 | } |
155 | static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); | |
156 | ||
157 | static ssize_t mtd_erasesize_show(struct device *dev, | |
158 | struct device_attribute *attr, char *buf) | |
159 | { | |
d5de20a9 | 160 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
161 | |
162 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); | |
694bb7fc KC |
163 | } |
164 | static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); | |
165 | ||
166 | static ssize_t mtd_writesize_show(struct device *dev, | |
167 | struct device_attribute *attr, char *buf) | |
168 | { | |
d5de20a9 | 169 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
170 | |
171 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); | |
694bb7fc KC |
172 | } |
173 | static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); | |
174 | ||
e7693548 AB |
175 | static ssize_t mtd_subpagesize_show(struct device *dev, |
176 | struct device_attribute *attr, char *buf) | |
177 | { | |
d5de20a9 | 178 | struct mtd_info *mtd = dev_get_drvdata(dev); |
e7693548 AB |
179 | unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; |
180 | ||
181 | return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); | |
e7693548 AB |
182 | } |
183 | static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); | |
184 | ||
694bb7fc KC |
185 | static ssize_t mtd_oobsize_show(struct device *dev, |
186 | struct device_attribute *attr, char *buf) | |
187 | { | |
d5de20a9 | 188 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
189 | |
190 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); | |
694bb7fc KC |
191 | } |
192 | static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); | |
193 | ||
7cc9aa66 XL |
194 | static ssize_t mtd_oobavail_show(struct device *dev, |
195 | struct device_attribute *attr, char *buf) | |
196 | { | |
197 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
198 | ||
199 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->oobavail); | |
200 | } | |
201 | static DEVICE_ATTR(oobavail, S_IRUGO, mtd_oobavail_show, NULL); | |
202 | ||
694bb7fc KC |
203 | static ssize_t mtd_numeraseregions_show(struct device *dev, |
204 | struct device_attribute *attr, char *buf) | |
205 | { | |
d5de20a9 | 206 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
207 | |
208 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); | |
694bb7fc KC |
209 | } |
210 | static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, | |
211 | NULL); | |
212 | ||
213 | static ssize_t mtd_name_show(struct device *dev, | |
214 | struct device_attribute *attr, char *buf) | |
215 | { | |
d5de20a9 | 216 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
217 | |
218 | return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); | |
694bb7fc KC |
219 | } |
220 | static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); | |
1f24b5a8 | 221 | |
a9b672e8 MD |
222 | static ssize_t mtd_ecc_strength_show(struct device *dev, |
223 | struct device_attribute *attr, char *buf) | |
224 | { | |
225 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
226 | ||
227 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength); | |
228 | } | |
229 | static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL); | |
230 | ||
d062d4ed MD |
231 | static ssize_t mtd_bitflip_threshold_show(struct device *dev, |
232 | struct device_attribute *attr, | |
233 | char *buf) | |
234 | { | |
235 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
236 | ||
237 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->bitflip_threshold); | |
238 | } | |
239 | ||
240 | static ssize_t mtd_bitflip_threshold_store(struct device *dev, | |
241 | struct device_attribute *attr, | |
242 | const char *buf, size_t count) | |
243 | { | |
244 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
245 | unsigned int bitflip_threshold; | |
246 | int retval; | |
247 | ||
248 | retval = kstrtouint(buf, 0, &bitflip_threshold); | |
249 | if (retval) | |
250 | return retval; | |
251 | ||
252 | mtd->bitflip_threshold = bitflip_threshold; | |
253 | return count; | |
254 | } | |
255 | static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR, | |
256 | mtd_bitflip_threshold_show, | |
257 | mtd_bitflip_threshold_store); | |
258 | ||
bf977e3f HS |
259 | static ssize_t mtd_ecc_step_size_show(struct device *dev, |
260 | struct device_attribute *attr, char *buf) | |
261 | { | |
262 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
263 | ||
264 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_step_size); | |
265 | ||
266 | } | |
267 | static DEVICE_ATTR(ecc_step_size, S_IRUGO, mtd_ecc_step_size_show, NULL); | |
268 | ||
990a3af0 EG |
269 | static ssize_t mtd_ecc_stats_corrected_show(struct device *dev, |
270 | struct device_attribute *attr, char *buf) | |
271 | { | |
272 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
273 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
274 | ||
275 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->corrected); | |
276 | } | |
277 | static DEVICE_ATTR(corrected_bits, S_IRUGO, | |
278 | mtd_ecc_stats_corrected_show, NULL); | |
279 | ||
280 | static ssize_t mtd_ecc_stats_errors_show(struct device *dev, | |
281 | struct device_attribute *attr, char *buf) | |
282 | { | |
283 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
284 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
285 | ||
286 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->failed); | |
287 | } | |
288 | static DEVICE_ATTR(ecc_failures, S_IRUGO, mtd_ecc_stats_errors_show, NULL); | |
289 | ||
290 | static ssize_t mtd_badblocks_show(struct device *dev, | |
291 | struct device_attribute *attr, char *buf) | |
292 | { | |
293 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
294 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
295 | ||
296 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->badblocks); | |
297 | } | |
298 | static DEVICE_ATTR(bad_blocks, S_IRUGO, mtd_badblocks_show, NULL); | |
299 | ||
300 | static ssize_t mtd_bbtblocks_show(struct device *dev, | |
301 | struct device_attribute *attr, char *buf) | |
302 | { | |
303 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
304 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
305 | ||
306 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->bbtblocks); | |
307 | } | |
308 | static DEVICE_ATTR(bbt_blocks, S_IRUGO, mtd_bbtblocks_show, NULL); | |
309 | ||
1f24b5a8 | 310 | static struct attribute *mtd_attrs[] = { |
694bb7fc KC |
311 | &dev_attr_type.attr, |
312 | &dev_attr_flags.attr, | |
313 | &dev_attr_size.attr, | |
314 | &dev_attr_erasesize.attr, | |
315 | &dev_attr_writesize.attr, | |
e7693548 | 316 | &dev_attr_subpagesize.attr, |
694bb7fc | 317 | &dev_attr_oobsize.attr, |
7cc9aa66 | 318 | &dev_attr_oobavail.attr, |
694bb7fc KC |
319 | &dev_attr_numeraseregions.attr, |
320 | &dev_attr_name.attr, | |
a9b672e8 | 321 | &dev_attr_ecc_strength.attr, |
bf977e3f | 322 | &dev_attr_ecc_step_size.attr, |
990a3af0 EG |
323 | &dev_attr_corrected_bits.attr, |
324 | &dev_attr_ecc_failures.attr, | |
325 | &dev_attr_bad_blocks.attr, | |
326 | &dev_attr_bbt_blocks.attr, | |
d062d4ed | 327 | &dev_attr_bitflip_threshold.attr, |
1f24b5a8 DB |
328 | NULL, |
329 | }; | |
54c738f6 | 330 | ATTRIBUTE_GROUPS(mtd); |
1f24b5a8 | 331 | |
75864b30 | 332 | static const struct device_type mtd_devtype = { |
1f24b5a8 DB |
333 | .name = "mtd", |
334 | .groups = mtd_groups, | |
335 | .release = mtd_release, | |
336 | }; | |
337 | ||
1018c94b ZL |
338 | static int mtd_partid_show(struct seq_file *s, void *p) |
339 | { | |
340 | struct mtd_info *mtd = s->private; | |
341 | ||
342 | seq_printf(s, "%s\n", mtd->dbg.partid); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | static int mtd_partid_debugfs_open(struct inode *inode, struct file *file) | |
348 | { | |
349 | return single_open(file, mtd_partid_show, inode->i_private); | |
350 | } | |
351 | ||
352 | static const struct file_operations mtd_partid_debug_fops = { | |
353 | .open = mtd_partid_debugfs_open, | |
354 | .read = seq_read, | |
355 | .llseek = seq_lseek, | |
356 | .release = single_release, | |
357 | }; | |
358 | ||
359 | static int mtd_partname_show(struct seq_file *s, void *p) | |
360 | { | |
361 | struct mtd_info *mtd = s->private; | |
362 | ||
363 | seq_printf(s, "%s\n", mtd->dbg.partname); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static int mtd_partname_debugfs_open(struct inode *inode, struct file *file) | |
369 | { | |
370 | return single_open(file, mtd_partname_show, inode->i_private); | |
371 | } | |
372 | ||
373 | static const struct file_operations mtd_partname_debug_fops = { | |
374 | .open = mtd_partname_debugfs_open, | |
375 | .read = seq_read, | |
376 | .llseek = seq_lseek, | |
377 | .release = single_release, | |
378 | }; | |
379 | ||
380 | static struct dentry *dfs_dir_mtd; | |
381 | ||
382 | static void mtd_debugfs_populate(struct mtd_info *mtd) | |
383 | { | |
384 | struct device *dev = &mtd->dev; | |
c2d73ba8 | 385 | struct dentry *root; |
1018c94b ZL |
386 | |
387 | if (IS_ERR_OR_NULL(dfs_dir_mtd)) | |
388 | return; | |
389 | ||
390 | root = debugfs_create_dir(dev_name(dev), dfs_dir_mtd); | |
1018c94b ZL |
391 | mtd->dbg.dfs_dir = root; |
392 | ||
c2d73ba8 GKH |
393 | if (mtd->dbg.partid) |
394 | debugfs_create_file("partid", 0400, root, mtd, | |
395 | &mtd_partid_debug_fops); | |
1018c94b | 396 | |
c2d73ba8 GKH |
397 | if (mtd->dbg.partname) |
398 | debugfs_create_file("partname", 0400, root, mtd, | |
399 | &mtd_partname_debug_fops); | |
1018c94b ZL |
400 | } |
401 | ||
b4caecd4 CH |
402 | #ifndef CONFIG_MMU |
403 | unsigned mtd_mmap_capabilities(struct mtd_info *mtd) | |
404 | { | |
405 | switch (mtd->type) { | |
406 | case MTD_RAM: | |
407 | return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | | |
408 | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
409 | case MTD_ROM: | |
410 | return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | | |
411 | NOMMU_MAP_READ; | |
412 | default: | |
413 | return NOMMU_MAP_COPY; | |
414 | } | |
415 | } | |
706a4e5a | 416 | EXPORT_SYMBOL_GPL(mtd_mmap_capabilities); |
b4caecd4 CH |
417 | #endif |
418 | ||
3efe41be BN |
419 | static int mtd_reboot_notifier(struct notifier_block *n, unsigned long state, |
420 | void *cmd) | |
421 | { | |
422 | struct mtd_info *mtd; | |
423 | ||
424 | mtd = container_of(n, struct mtd_info, reboot_notifier); | |
425 | mtd->_reboot(mtd); | |
426 | ||
427 | return NOTIFY_DONE; | |
428 | } | |
429 | ||
477b0229 BB |
430 | /** |
431 | * mtd_wunit_to_pairing_info - get pairing information of a wunit | |
432 | * @mtd: pointer to new MTD device info structure | |
433 | * @wunit: write unit we are interested in | |
434 | * @info: returned pairing information | |
435 | * | |
436 | * Retrieve pairing information associated to the wunit. | |
437 | * This is mainly useful when dealing with MLC/TLC NANDs where pages can be | |
438 | * paired together, and where programming a page may influence the page it is | |
439 | * paired with. | |
440 | * The notion of page is replaced by the term wunit (write-unit) to stay | |
441 | * consistent with the ->writesize field. | |
442 | * | |
443 | * The @wunit argument can be extracted from an absolute offset using | |
444 | * mtd_offset_to_wunit(). @info is filled with the pairing information attached | |
445 | * to @wunit. | |
446 | * | |
447 | * From the pairing info the MTD user can find all the wunits paired with | |
448 | * @wunit using the following loop: | |
449 | * | |
450 | * for (i = 0; i < mtd_pairing_groups(mtd); i++) { | |
451 | * info.pair = i; | |
452 | * mtd_pairing_info_to_wunit(mtd, &info); | |
453 | * ... | |
454 | * } | |
455 | */ | |
456 | int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit, | |
457 | struct mtd_pairing_info *info) | |
458 | { | |
46b5889c MR |
459 | struct mtd_info *master = mtd_get_master(mtd); |
460 | int npairs = mtd_wunit_per_eb(master) / mtd_pairing_groups(master); | |
477b0229 BB |
461 | |
462 | if (wunit < 0 || wunit >= npairs) | |
463 | return -EINVAL; | |
464 | ||
46b5889c MR |
465 | if (master->pairing && master->pairing->get_info) |
466 | return master->pairing->get_info(master, wunit, info); | |
477b0229 BB |
467 | |
468 | info->group = 0; | |
469 | info->pair = wunit; | |
470 | ||
471 | return 0; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(mtd_wunit_to_pairing_info); | |
474 | ||
475 | /** | |
c77a9312 | 476 | * mtd_pairing_info_to_wunit - get wunit from pairing information |
477b0229 BB |
477 | * @mtd: pointer to new MTD device info structure |
478 | * @info: pairing information struct | |
479 | * | |
480 | * Returns a positive number representing the wunit associated to the info | |
481 | * struct, or a negative error code. | |
482 | * | |
483 | * This is the reverse of mtd_wunit_to_pairing_info(), and can help one to | |
484 | * iterate over all wunits of a given pair (see mtd_wunit_to_pairing_info() | |
485 | * doc). | |
486 | * | |
487 | * It can also be used to only program the first page of each pair (i.e. | |
488 | * page attached to group 0), which allows one to use an MLC NAND in | |
489 | * software-emulated SLC mode: | |
490 | * | |
491 | * info.group = 0; | |
492 | * npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd); | |
493 | * for (info.pair = 0; info.pair < npairs; info.pair++) { | |
494 | * wunit = mtd_pairing_info_to_wunit(mtd, &info); | |
495 | * mtd_write(mtd, mtd_wunit_to_offset(mtd, blkoffs, wunit), | |
496 | * mtd->writesize, &retlen, buf + (i * mtd->writesize)); | |
497 | * } | |
498 | */ | |
499 | int mtd_pairing_info_to_wunit(struct mtd_info *mtd, | |
500 | const struct mtd_pairing_info *info) | |
501 | { | |
46b5889c MR |
502 | struct mtd_info *master = mtd_get_master(mtd); |
503 | int ngroups = mtd_pairing_groups(master); | |
504 | int npairs = mtd_wunit_per_eb(master) / ngroups; | |
477b0229 BB |
505 | |
506 | if (!info || info->pair < 0 || info->pair >= npairs || | |
507 | info->group < 0 || info->group >= ngroups) | |
508 | return -EINVAL; | |
509 | ||
46b5889c MR |
510 | if (master->pairing && master->pairing->get_wunit) |
511 | return mtd->pairing->get_wunit(master, info); | |
477b0229 BB |
512 | |
513 | return info->pair; | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(mtd_pairing_info_to_wunit); | |
516 | ||
517 | /** | |
518 | * mtd_pairing_groups - get the number of pairing groups | |
519 | * @mtd: pointer to new MTD device info structure | |
520 | * | |
521 | * Returns the number of pairing groups. | |
522 | * | |
523 | * This number is usually equal to the number of bits exposed by a single | |
524 | * cell, and can be used in conjunction with mtd_pairing_info_to_wunit() | |
525 | * to iterate over all pages of a given pair. | |
526 | */ | |
527 | int mtd_pairing_groups(struct mtd_info *mtd) | |
528 | { | |
46b5889c MR |
529 | struct mtd_info *master = mtd_get_master(mtd); |
530 | ||
531 | if (!master->pairing || !master->pairing->ngroups) | |
477b0229 BB |
532 | return 1; |
533 | ||
46b5889c | 534 | return master->pairing->ngroups; |
477b0229 BB |
535 | } |
536 | EXPORT_SYMBOL_GPL(mtd_pairing_groups); | |
537 | ||
c4dfa25a AB |
538 | static int mtd_nvmem_reg_read(void *priv, unsigned int offset, |
539 | void *val, size_t bytes) | |
540 | { | |
541 | struct mtd_info *mtd = priv; | |
542 | size_t retlen; | |
543 | int err; | |
544 | ||
545 | err = mtd_read(mtd, offset, bytes, &retlen, val); | |
546 | if (err && err != -EUCLEAN) | |
547 | return err; | |
548 | ||
549 | return retlen == bytes ? 0 : -EIO; | |
550 | } | |
551 | ||
552 | static int mtd_nvmem_add(struct mtd_info *mtd) | |
553 | { | |
554 | struct nvmem_config config = {}; | |
555 | ||
6e952685 | 556 | config.id = -1; |
c4dfa25a | 557 | config.dev = &mtd->dev; |
7b01b723 | 558 | config.name = dev_name(&mtd->dev); |
c4dfa25a AB |
559 | config.owner = THIS_MODULE; |
560 | config.reg_read = mtd_nvmem_reg_read; | |
561 | config.size = mtd->size; | |
562 | config.word_size = 1; | |
563 | config.stride = 1; | |
564 | config.read_only = true; | |
565 | config.root_only = true; | |
566 | config.no_of_node = true; | |
567 | config.priv = mtd; | |
568 | ||
569 | mtd->nvmem = nvmem_register(&config); | |
570 | if (IS_ERR(mtd->nvmem)) { | |
571 | /* Just ignore if there is no NVMEM support in the kernel */ | |
19e16fb4 | 572 | if (PTR_ERR(mtd->nvmem) == -EOPNOTSUPP) { |
c4dfa25a AB |
573 | mtd->nvmem = NULL; |
574 | } else { | |
575 | dev_err(&mtd->dev, "Failed to register NVMEM device\n"); | |
576 | return PTR_ERR(mtd->nvmem); | |
577 | } | |
578 | } | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
1da177e4 LT |
583 | /** |
584 | * add_mtd_device - register an MTD device | |
585 | * @mtd: pointer to new MTD device info structure | |
586 | * | |
587 | * Add a device to the list of MTD devices present in the system, and | |
588 | * notify each currently active MTD 'user' of its arrival. Returns | |
57dd990c | 589 | * zero on success or non-zero on failure. |
1da177e4 LT |
590 | */ |
591 | ||
592 | int add_mtd_device(struct mtd_info *mtd) | |
593 | { | |
46b5889c | 594 | struct mtd_info *master = mtd_get_master(mtd); |
b520e412 BH |
595 | struct mtd_notifier *not; |
596 | int i, error; | |
1da177e4 | 597 | |
be0dbff8 BN |
598 | /* |
599 | * May occur, for instance, on buggy drivers which call | |
600 | * mtd_device_parse_register() multiple times on the same master MTD, | |
601 | * especially with CONFIG_MTD_PARTITIONED_MASTER=y. | |
602 | */ | |
fa06052d | 603 | if (WARN_ONCE(mtd->dev.type, "MTD already registered\n")) |
be0dbff8 BN |
604 | return -EEXIST; |
605 | ||
783ed81f | 606 | BUG_ON(mtd->writesize == 0); |
33f45c44 | 607 | |
2431c4f5 BB |
608 | /* |
609 | * MTD drivers should implement ->_{write,read}() or | |
610 | * ->_{write,read}_oob(), but not both. | |
611 | */ | |
612 | if (WARN_ON((mtd->_write && mtd->_write_oob) || | |
613 | (mtd->_read && mtd->_read_oob))) | |
614 | return -EINVAL; | |
615 | ||
46b5889c | 616 | if (WARN_ON((!mtd->erasesize || !master->_erase) && |
33f45c44 BB |
617 | !(mtd->flags & MTD_NO_ERASE))) |
618 | return -EINVAL; | |
619 | ||
48b19268 | 620 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 621 | |
589e9c4d | 622 | i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); |
57dd990c BN |
623 | if (i < 0) { |
624 | error = i; | |
b520e412 | 625 | goto fail_locked; |
57dd990c | 626 | } |
1f24b5a8 | 627 | |
b520e412 BH |
628 | mtd->index = i; |
629 | mtd->usecount = 0; | |
630 | ||
d062d4ed MD |
631 | /* default value if not set by driver */ |
632 | if (mtd->bitflip_threshold == 0) | |
633 | mtd->bitflip_threshold = mtd->ecc_strength; | |
634 | ||
b520e412 BH |
635 | if (is_power_of_2(mtd->erasesize)) |
636 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; | |
637 | else | |
638 | mtd->erasesize_shift = 0; | |
639 | ||
640 | if (is_power_of_2(mtd->writesize)) | |
641 | mtd->writesize_shift = ffs(mtd->writesize) - 1; | |
642 | else | |
643 | mtd->writesize_shift = 0; | |
644 | ||
645 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; | |
646 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; | |
647 | ||
648 | /* Some chips always power up locked. Unlock them now */ | |
38134565 AB |
649 | if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { |
650 | error = mtd_unlock(mtd, 0, mtd->size); | |
651 | if (error && error != -EOPNOTSUPP) | |
b520e412 BH |
652 | printk(KERN_WARNING |
653 | "%s: unlock failed, writes may not work\n", | |
654 | mtd->name); | |
57dd990c BN |
655 | /* Ignore unlock failures? */ |
656 | error = 0; | |
b520e412 BH |
657 | } |
658 | ||
659 | /* Caller should have set dev.parent to match the | |
260e89a6 | 660 | * physical device, if appropriate. |
b520e412 BH |
661 | */ |
662 | mtd->dev.type = &mtd_devtype; | |
663 | mtd->dev.class = &mtd_class; | |
664 | mtd->dev.devt = MTD_DEVT(i); | |
665 | dev_set_name(&mtd->dev, "mtd%d", i); | |
666 | dev_set_drvdata(&mtd->dev, mtd); | |
215a02fd | 667 | of_node_get(mtd_get_of_node(mtd)); |
57dd990c BN |
668 | error = device_register(&mtd->dev); |
669 | if (error) | |
b520e412 BH |
670 | goto fail_added; |
671 | ||
c4dfa25a AB |
672 | /* Add the nvmem provider */ |
673 | error = mtd_nvmem_add(mtd); | |
674 | if (error) | |
675 | goto fail_nvmem_add; | |
676 | ||
1018c94b | 677 | mtd_debugfs_populate(mtd); |
e8e3edb9 | 678 | |
5e472128 BN |
679 | device_create(&mtd_class, mtd->dev.parent, MTD_DEVT(i) + 1, NULL, |
680 | "mtd%dro", i); | |
b520e412 | 681 | |
289c0522 | 682 | pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); |
b520e412 BH |
683 | /* No need to get a refcount on the module containing |
684 | the notifier, since we hold the mtd_table_mutex */ | |
685 | list_for_each_entry(not, &mtd_notifiers, list) | |
686 | not->add(mtd); | |
687 | ||
688 | mutex_unlock(&mtd_table_mutex); | |
689 | /* We _know_ we aren't being removed, because | |
690 | our caller is still holding us here. So none | |
691 | of this try_ nonsense, and no bitching about it | |
692 | either. :) */ | |
693 | __module_get(THIS_MODULE); | |
694 | return 0; | |
97894cda | 695 | |
c4dfa25a AB |
696 | fail_nvmem_add: |
697 | device_unregister(&mtd->dev); | |
b520e412 | 698 | fail_added: |
215a02fd | 699 | of_node_put(mtd_get_of_node(mtd)); |
b520e412 BH |
700 | idr_remove(&mtd_idr, i); |
701 | fail_locked: | |
48b19268 | 702 | mutex_unlock(&mtd_table_mutex); |
57dd990c | 703 | return error; |
1da177e4 LT |
704 | } |
705 | ||
706 | /** | |
707 | * del_mtd_device - unregister an MTD device | |
708 | * @mtd: pointer to MTD device info structure | |
709 | * | |
710 | * Remove a device from the list of MTD devices present in the system, | |
711 | * and notify each currently active MTD 'user' of its departure. | |
712 | * Returns zero on success or 1 on failure, which currently will happen | |
713 | * if the requested device does not appear to be present in the list. | |
714 | */ | |
715 | ||
eea72d5f | 716 | int del_mtd_device(struct mtd_info *mtd) |
1da177e4 LT |
717 | { |
718 | int ret; | |
75c0b84d | 719 | struct mtd_notifier *not; |
97894cda | 720 | |
48b19268 | 721 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 722 | |
e8e3edb9 MR |
723 | debugfs_remove_recursive(mtd->dbg.dfs_dir); |
724 | ||
b520e412 | 725 | if (idr_find(&mtd_idr, mtd->index) != mtd) { |
1da177e4 | 726 | ret = -ENODEV; |
75c0b84d ML |
727 | goto out_error; |
728 | } | |
729 | ||
730 | /* No need to get a refcount on the module containing | |
731 | the notifier, since we hold the mtd_table_mutex */ | |
732 | list_for_each_entry(not, &mtd_notifiers, list) | |
733 | not->remove(mtd); | |
734 | ||
735 | if (mtd->usecount) { | |
97894cda | 736 | printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", |
1da177e4 LT |
737 | mtd->index, mtd->name, mtd->usecount); |
738 | ret = -EBUSY; | |
739 | } else { | |
c4dfa25a AB |
740 | /* Try to remove the NVMEM provider */ |
741 | if (mtd->nvmem) | |
742 | nvmem_unregister(mtd->nvmem); | |
743 | ||
694bb7fc KC |
744 | device_unregister(&mtd->dev); |
745 | ||
b520e412 | 746 | idr_remove(&mtd_idr, mtd->index); |
215a02fd | 747 | of_node_put(mtd_get_of_node(mtd)); |
1da177e4 LT |
748 | |
749 | module_put(THIS_MODULE); | |
750 | ret = 0; | |
751 | } | |
752 | ||
75c0b84d | 753 | out_error: |
48b19268 | 754 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
755 | return ret; |
756 | } | |
757 | ||
472b444e BN |
758 | /* |
759 | * Set a few defaults based on the parent devices, if not provided by the | |
760 | * driver | |
761 | */ | |
762 | static void mtd_set_dev_defaults(struct mtd_info *mtd) | |
763 | { | |
764 | if (mtd->dev.parent) { | |
765 | if (!mtd->owner && mtd->dev.parent->driver) | |
766 | mtd->owner = mtd->dev.parent->driver->owner; | |
767 | if (!mtd->name) | |
768 | mtd->name = dev_name(mtd->dev.parent); | |
769 | } else { | |
770 | pr_debug("mtd device won't show a device symlink in sysfs\n"); | |
771 | } | |
1186af45 | 772 | |
46b5889c MR |
773 | INIT_LIST_HEAD(&mtd->partitions); |
774 | mutex_init(&mtd->master.partitions_lock); | |
472b444e | 775 | } |
727dc612 | 776 | |
1c4c215c DB |
777 | /** |
778 | * mtd_device_parse_register - parse partitions and register an MTD device. | |
779 | * | |
780 | * @mtd: the MTD device to register | |
781 | * @types: the list of MTD partition probes to try, see | |
782 | * 'parse_mtd_partitions()' for more information | |
c7975330 | 783 | * @parser_data: MTD partition parser-specific data |
1c4c215c DB |
784 | * @parts: fallback partition information to register, if parsing fails; |
785 | * only valid if %nr_parts > %0 | |
786 | * @nr_parts: the number of partitions in parts, if zero then the full | |
787 | * MTD device is registered if no partition info is found | |
788 | * | |
789 | * This function aggregates MTD partitions parsing (done by | |
790 | * 'parse_mtd_partitions()') and MTD device and partitions registering. It | |
791 | * basically follows the most common pattern found in many MTD drivers: | |
792 | * | |
55a999a0 RM |
793 | * * If the MTD_PARTITIONED_MASTER option is set, then the device as a whole is |
794 | * registered first. | |
795 | * * Then It tries to probe partitions on MTD device @mtd using parsers | |
1c4c215c DB |
796 | * specified in @types (if @types is %NULL, then the default list of parsers |
797 | * is used, see 'parse_mtd_partitions()' for more information). If none are | |
798 | * found this functions tries to fallback to information specified in | |
799 | * @parts/@nr_parts. | |
1c4c215c DB |
800 | * * If no partitions were found this function just registers the MTD device |
801 | * @mtd and exits. | |
802 | * | |
803 | * Returns zero in case of success and a negative error code in case of failure. | |
804 | */ | |
26a47346 | 805 | int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types, |
c7975330 | 806 | struct mtd_part_parser_data *parser_data, |
1c4c215c DB |
807 | const struct mtd_partition *parts, |
808 | int nr_parts) | |
809 | { | |
727dc612 | 810 | int ret; |
1c4c215c | 811 | |
472b444e BN |
812 | mtd_set_dev_defaults(mtd); |
813 | ||
2c77c57d RM |
814 | if (IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) { |
815 | ret = add_mtd_device(mtd); | |
816 | if (ret) | |
817 | return ret; | |
818 | } | |
819 | ||
0dbe4ea7 | 820 | /* Prefer parsed partitions over driver-provided fallback */ |
5ac67ce3 RM |
821 | ret = parse_mtd_partitions(mtd, types, parser_data); |
822 | if (ret > 0) | |
823 | ret = 0; | |
824 | else if (nr_parts) | |
0dbe4ea7 RM |
825 | ret = add_mtd_partitions(mtd, parts, nr_parts); |
826 | else if (!device_is_registered(&mtd->dev)) | |
827 | ret = add_mtd_device(mtd); | |
828 | else | |
829 | ret = 0; | |
830 | ||
3e00ed0e BN |
831 | if (ret) |
832 | goto out; | |
1c4c215c | 833 | |
e1dd8641 NC |
834 | /* |
835 | * FIXME: some drivers unfortunately call this function more than once. | |
836 | * So we have to check if we've already assigned the reboot notifier. | |
837 | * | |
838 | * Generally, we can make multiple calls work for most cases, but it | |
839 | * does cause problems with parse_mtd_partitions() above (e.g., | |
840 | * cmdlineparts will register partitions more than once). | |
841 | */ | |
f8479dd6 BN |
842 | WARN_ONCE(mtd->_reboot && mtd->reboot_notifier.notifier_call, |
843 | "MTD already registered\n"); | |
e1dd8641 | 844 | if (mtd->_reboot && !mtd->reboot_notifier.notifier_call) { |
3efe41be BN |
845 | mtd->reboot_notifier.notifier_call = mtd_reboot_notifier; |
846 | register_reboot_notifier(&mtd->reboot_notifier); | |
847 | } | |
848 | ||
3e00ed0e | 849 | out: |
2c77c57d RM |
850 | if (ret && device_is_registered(&mtd->dev)) |
851 | del_mtd_device(mtd); | |
852 | ||
727dc612 | 853 | return ret; |
1c4c215c DB |
854 | } |
855 | EXPORT_SYMBOL_GPL(mtd_device_parse_register); | |
856 | ||
f5671ab3 JI |
857 | /** |
858 | * mtd_device_unregister - unregister an existing MTD device. | |
859 | * | |
860 | * @master: the MTD device to unregister. This will unregister both the master | |
861 | * and any partitions if registered. | |
862 | */ | |
863 | int mtd_device_unregister(struct mtd_info *master) | |
864 | { | |
865 | int err; | |
866 | ||
3efe41be BN |
867 | if (master->_reboot) |
868 | unregister_reboot_notifier(&master->reboot_notifier); | |
869 | ||
f5671ab3 JI |
870 | err = del_mtd_partitions(master); |
871 | if (err) | |
872 | return err; | |
873 | ||
874 | if (!device_is_registered(&master->dev)) | |
875 | return 0; | |
876 | ||
877 | return del_mtd_device(master); | |
878 | } | |
879 | EXPORT_SYMBOL_GPL(mtd_device_unregister); | |
880 | ||
1da177e4 LT |
881 | /** |
882 | * register_mtd_user - register a 'user' of MTD devices. | |
883 | * @new: pointer to notifier info structure | |
884 | * | |
885 | * Registers a pair of callbacks function to be called upon addition | |
886 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
887 | * invoked for each MTD device currently present in the system. | |
888 | */ | |
1da177e4 LT |
889 | void register_mtd_user (struct mtd_notifier *new) |
890 | { | |
f1332ba2 | 891 | struct mtd_info *mtd; |
1da177e4 | 892 | |
48b19268 | 893 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
894 | |
895 | list_add(&new->list, &mtd_notifiers); | |
896 | ||
d5ca5129 | 897 | __module_get(THIS_MODULE); |
97894cda | 898 | |
f1332ba2 BH |
899 | mtd_for_each_device(mtd) |
900 | new->add(mtd); | |
1da177e4 | 901 | |
48b19268 | 902 | mutex_unlock(&mtd_table_mutex); |
1da177e4 | 903 | } |
33c87b4a | 904 | EXPORT_SYMBOL_GPL(register_mtd_user); |
1da177e4 LT |
905 | |
906 | /** | |
49450795 AB |
907 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
908 | * @old: pointer to notifier info structure | |
1da177e4 LT |
909 | * |
910 | * Removes a callback function pair from the list of 'users' to be | |
911 | * notified upon addition or removal of MTD devices. Causes the | |
912 | * 'remove' callback to be immediately invoked for each MTD device | |
913 | * currently present in the system. | |
914 | */ | |
1da177e4 LT |
915 | int unregister_mtd_user (struct mtd_notifier *old) |
916 | { | |
f1332ba2 | 917 | struct mtd_info *mtd; |
1da177e4 | 918 | |
48b19268 | 919 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
920 | |
921 | module_put(THIS_MODULE); | |
922 | ||
f1332ba2 BH |
923 | mtd_for_each_device(mtd) |
924 | old->remove(mtd); | |
97894cda | 925 | |
1da177e4 | 926 | list_del(&old->list); |
48b19268 | 927 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
928 | return 0; |
929 | } | |
33c87b4a | 930 | EXPORT_SYMBOL_GPL(unregister_mtd_user); |
1da177e4 LT |
931 | |
932 | /** | |
933 | * get_mtd_device - obtain a validated handle for an MTD device | |
934 | * @mtd: last known address of the required MTD device | |
935 | * @num: internal device number of the required MTD device | |
936 | * | |
937 | * Given a number and NULL address, return the num'th entry in the device | |
938 | * table, if any. Given an address and num == -1, search the device table | |
939 | * for a device with that address and return if it's still present. Given | |
9c74034f AB |
940 | * both, return the num'th driver only if its address matches. Return |
941 | * error code if not. | |
1da177e4 | 942 | */ |
1da177e4 LT |
943 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
944 | { | |
f1332ba2 BH |
945 | struct mtd_info *ret = NULL, *other; |
946 | int err = -ENODEV; | |
1da177e4 | 947 | |
48b19268 | 948 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
949 | |
950 | if (num == -1) { | |
f1332ba2 BH |
951 | mtd_for_each_device(other) { |
952 | if (other == mtd) { | |
953 | ret = mtd; | |
954 | break; | |
955 | } | |
956 | } | |
b520e412 BH |
957 | } else if (num >= 0) { |
958 | ret = idr_find(&mtd_idr, num); | |
1da177e4 LT |
959 | if (mtd && mtd != ret) |
960 | ret = NULL; | |
961 | } | |
962 | ||
3bd45657 ML |
963 | if (!ret) { |
964 | ret = ERR_PTR(err); | |
965 | goto out; | |
9fe912ce | 966 | } |
1da177e4 | 967 | |
3bd45657 ML |
968 | err = __get_mtd_device(ret); |
969 | if (err) | |
970 | ret = ERR_PTR(err); | |
971 | out: | |
9c74034f AB |
972 | mutex_unlock(&mtd_table_mutex); |
973 | return ret; | |
3bd45657 | 974 | } |
33c87b4a | 975 | EXPORT_SYMBOL_GPL(get_mtd_device); |
1da177e4 | 976 | |
3bd45657 ML |
977 | |
978 | int __get_mtd_device(struct mtd_info *mtd) | |
979 | { | |
46b5889c | 980 | struct mtd_info *master = mtd_get_master(mtd); |
3bd45657 ML |
981 | int err; |
982 | ||
46b5889c | 983 | if (!try_module_get(master->owner)) |
3bd45657 ML |
984 | return -ENODEV; |
985 | ||
46b5889c MR |
986 | if (master->_get_device) { |
987 | err = master->_get_device(mtd); | |
3bd45657 ML |
988 | |
989 | if (err) { | |
46b5889c | 990 | module_put(master->owner); |
3bd45657 ML |
991 | return err; |
992 | } | |
993 | } | |
46b5889c MR |
994 | |
995 | while (mtd->parent) { | |
996 | mtd->usecount++; | |
997 | mtd = mtd->parent; | |
998 | } | |
999 | ||
3bd45657 | 1000 | return 0; |
1da177e4 | 1001 | } |
33c87b4a | 1002 | EXPORT_SYMBOL_GPL(__get_mtd_device); |
1da177e4 | 1003 | |
7799308f AB |
1004 | /** |
1005 | * get_mtd_device_nm - obtain a validated handle for an MTD device by | |
1006 | * device name | |
1007 | * @name: MTD device name to open | |
1008 | * | |
1009 | * This function returns MTD device description structure in case of | |
1010 | * success and an error code in case of failure. | |
1011 | */ | |
7799308f AB |
1012 | struct mtd_info *get_mtd_device_nm(const char *name) |
1013 | { | |
f1332ba2 BH |
1014 | int err = -ENODEV; |
1015 | struct mtd_info *mtd = NULL, *other; | |
7799308f AB |
1016 | |
1017 | mutex_lock(&mtd_table_mutex); | |
1018 | ||
f1332ba2 BH |
1019 | mtd_for_each_device(other) { |
1020 | if (!strcmp(name, other->name)) { | |
1021 | mtd = other; | |
7799308f AB |
1022 | break; |
1023 | } | |
1024 | } | |
1025 | ||
9fe912ce | 1026 | if (!mtd) |
7799308f AB |
1027 | goto out_unlock; |
1028 | ||
52534f2d WG |
1029 | err = __get_mtd_device(mtd); |
1030 | if (err) | |
7799308f AB |
1031 | goto out_unlock; |
1032 | ||
9fe912ce AB |
1033 | mutex_unlock(&mtd_table_mutex); |
1034 | return mtd; | |
7799308f AB |
1035 | |
1036 | out_unlock: | |
1037 | mutex_unlock(&mtd_table_mutex); | |
9fe912ce | 1038 | return ERR_PTR(err); |
7799308f | 1039 | } |
33c87b4a | 1040 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); |
7799308f | 1041 | |
1da177e4 LT |
1042 | void put_mtd_device(struct mtd_info *mtd) |
1043 | { | |
48b19268 | 1044 | mutex_lock(&mtd_table_mutex); |
3bd45657 ML |
1045 | __put_mtd_device(mtd); |
1046 | mutex_unlock(&mtd_table_mutex); | |
1047 | ||
1048 | } | |
33c87b4a | 1049 | EXPORT_SYMBOL_GPL(put_mtd_device); |
3bd45657 ML |
1050 | |
1051 | void __put_mtd_device(struct mtd_info *mtd) | |
1052 | { | |
46b5889c | 1053 | struct mtd_info *master = mtd_get_master(mtd); |
3bd45657 | 1054 | |
46b5889c MR |
1055 | while (mtd->parent) { |
1056 | --mtd->usecount; | |
1057 | BUG_ON(mtd->usecount < 0); | |
1058 | mtd = mtd->parent; | |
1059 | } | |
1060 | ||
1061 | if (master->_put_device) | |
1062 | master->_put_device(master); | |
1da177e4 | 1063 | |
46b5889c | 1064 | module_put(master->owner); |
1da177e4 | 1065 | } |
33c87b4a | 1066 | EXPORT_SYMBOL_GPL(__put_mtd_device); |
1da177e4 | 1067 | |
8273a0c9 | 1068 | /* |
884cfd90 BB |
1069 | * Erase is an synchronous operation. Device drivers are epected to return a |
1070 | * negative error code if the operation failed and update instr->fail_addr | |
1071 | * to point the portion that was not properly erased. | |
8273a0c9 AB |
1072 | */ |
1073 | int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) | |
1074 | { | |
46b5889c MR |
1075 | struct mtd_info *master = mtd_get_master(mtd); |
1076 | u64 mst_ofs = mtd_get_master_ofs(mtd, 0); | |
1077 | int ret; | |
1078 | ||
c585da9f BB |
1079 | instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; |
1080 | ||
46b5889c | 1081 | if (!mtd->erasesize || !master->_erase) |
e6e620f0 BB |
1082 | return -ENOTSUPP; |
1083 | ||
0c2b4e21 | 1084 | if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr) |
8273a0c9 | 1085 | return -EINVAL; |
664addc2 AB |
1086 | if (!(mtd->flags & MTD_WRITEABLE)) |
1087 | return -EROFS; | |
e6e620f0 | 1088 | |
e7bfb3fd | 1089 | if (!instr->len) |
bcb1d238 | 1090 | return 0; |
e7bfb3fd | 1091 | |
fea728c0 | 1092 | ledtrig_mtd_activity(); |
46b5889c MR |
1093 | |
1094 | instr->addr += mst_ofs; | |
1095 | ret = master->_erase(master, instr); | |
1096 | if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) | |
1097 | instr->fail_addr -= mst_ofs; | |
1098 | ||
1099 | instr->addr -= mst_ofs; | |
1100 | return ret; | |
8273a0c9 AB |
1101 | } |
1102 | EXPORT_SYMBOL_GPL(mtd_erase); | |
1103 | ||
1104 | /* | |
1105 | * This stuff for eXecute-In-Place. phys is optional and may be set to NULL. | |
1106 | */ | |
1107 | int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
1108 | void **virt, resource_size_t *phys) | |
1109 | { | |
46b5889c MR |
1110 | struct mtd_info *master = mtd_get_master(mtd); |
1111 | ||
8273a0c9 | 1112 | *retlen = 0; |
0dd5235f AB |
1113 | *virt = NULL; |
1114 | if (phys) | |
1115 | *phys = 0; | |
46b5889c | 1116 | if (!master->_point) |
8273a0c9 | 1117 | return -EOPNOTSUPP; |
0c2b4e21 | 1118 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c9 | 1119 | return -EINVAL; |
bcb1d238 AB |
1120 | if (!len) |
1121 | return 0; | |
46b5889c MR |
1122 | |
1123 | from = mtd_get_master_ofs(mtd, from); | |
1124 | return master->_point(master, from, len, retlen, virt, phys); | |
8273a0c9 AB |
1125 | } |
1126 | EXPORT_SYMBOL_GPL(mtd_point); | |
1127 | ||
1128 | /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ | |
1129 | int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len) | |
1130 | { | |
46b5889c MR |
1131 | struct mtd_info *master = mtd_get_master(mtd); |
1132 | ||
1133 | if (!master->_unpoint) | |
8273a0c9 | 1134 | return -EOPNOTSUPP; |
0c2b4e21 | 1135 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c9 | 1136 | return -EINVAL; |
bcb1d238 AB |
1137 | if (!len) |
1138 | return 0; | |
46b5889c | 1139 | return master->_unpoint(master, mtd_get_master_ofs(mtd, from), len); |
8273a0c9 AB |
1140 | } |
1141 | EXPORT_SYMBOL_GPL(mtd_unpoint); | |
1142 | ||
1143 | /* | |
1144 | * Allow NOMMU mmap() to directly map the device (if not NULL) | |
1145 | * - return the address to which the offset maps | |
1146 | * - return -ENOSYS to indicate refusal to do the mapping | |
1147 | */ | |
1148 | unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, | |
1149 | unsigned long offset, unsigned long flags) | |
1150 | { | |
9eaa903c NP |
1151 | size_t retlen; |
1152 | void *virt; | |
1153 | int ret; | |
1154 | ||
1155 | ret = mtd_point(mtd, offset, len, &retlen, &virt, NULL); | |
1156 | if (ret) | |
1157 | return ret; | |
1158 | if (retlen != len) { | |
1159 | mtd_unpoint(mtd, offset, retlen); | |
1160 | return -ENOSYS; | |
1161 | } | |
1162 | return (unsigned long)virt; | |
8273a0c9 AB |
1163 | } |
1164 | EXPORT_SYMBOL_GPL(mtd_get_unmapped_area); | |
1165 | ||
46b5889c MR |
1166 | static void mtd_update_ecc_stats(struct mtd_info *mtd, struct mtd_info *master, |
1167 | const struct mtd_ecc_stats *old_stats) | |
1168 | { | |
1169 | struct mtd_ecc_stats diff; | |
1170 | ||
1171 | if (master == mtd) | |
1172 | return; | |
1173 | ||
1174 | diff = master->ecc_stats; | |
1175 | diff.failed -= old_stats->failed; | |
1176 | diff.corrected -= old_stats->corrected; | |
1177 | ||
1178 | while (mtd->parent) { | |
1179 | mtd->ecc_stats.failed += diff.failed; | |
1180 | mtd->ecc_stats.corrected += diff.corrected; | |
1181 | mtd = mtd->parent; | |
1182 | } | |
1183 | } | |
1184 | ||
8273a0c9 AB |
1185 | int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, |
1186 | u_char *buf) | |
1187 | { | |
2431c4f5 BB |
1188 | struct mtd_oob_ops ops = { |
1189 | .len = len, | |
1190 | .datbuf = buf, | |
1191 | }; | |
1192 | int ret; | |
edbc4540 | 1193 | |
2431c4f5 BB |
1194 | ret = mtd_read_oob(mtd, from, &ops); |
1195 | *retlen = ops.retlen; | |
24ff1292 | 1196 | |
2431c4f5 | 1197 | return ret; |
8273a0c9 AB |
1198 | } |
1199 | EXPORT_SYMBOL_GPL(mtd_read); | |
1200 | ||
1201 | int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
1202 | const u_char *buf) | |
1203 | { | |
2431c4f5 BB |
1204 | struct mtd_oob_ops ops = { |
1205 | .len = len, | |
1206 | .datbuf = (u8 *)buf, | |
1207 | }; | |
1208 | int ret; | |
24ff1292 | 1209 | |
2431c4f5 BB |
1210 | ret = mtd_write_oob(mtd, to, &ops); |
1211 | *retlen = ops.retlen; | |
24ff1292 | 1212 | |
2431c4f5 | 1213 | return ret; |
8273a0c9 AB |
1214 | } |
1215 | EXPORT_SYMBOL_GPL(mtd_write); | |
1216 | ||
1217 | /* | |
1218 | * In blackbox flight recorder like scenarios we want to make successful writes | |
1219 | * in interrupt context. panic_write() is only intended to be called when its | |
1220 | * known the kernel is about to panic and we need the write to succeed. Since | |
1221 | * the kernel is not going to be running for much longer, this function can | |
1222 | * break locks and delay to ensure the write succeeds (but not sleep). | |
1223 | */ | |
1224 | int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
1225 | const u_char *buf) | |
1226 | { | |
46b5889c MR |
1227 | struct mtd_info *master = mtd_get_master(mtd); |
1228 | ||
8273a0c9 | 1229 | *retlen = 0; |
46b5889c | 1230 | if (!master->_panic_write) |
8273a0c9 | 1231 | return -EOPNOTSUPP; |
0c2b4e21 | 1232 | if (to < 0 || to >= mtd->size || len > mtd->size - to) |
8273a0c9 | 1233 | return -EINVAL; |
664addc2 AB |
1234 | if (!(mtd->flags & MTD_WRITEABLE)) |
1235 | return -EROFS; | |
bcb1d238 AB |
1236 | if (!len) |
1237 | return 0; | |
9f897bfd KD |
1238 | if (!mtd->oops_panic_write) |
1239 | mtd->oops_panic_write = true; | |
1240 | ||
46b5889c MR |
1241 | return master->_panic_write(master, mtd_get_master_ofs(mtd, to), len, |
1242 | retlen, buf); | |
8273a0c9 AB |
1243 | } |
1244 | EXPORT_SYMBOL_GPL(mtd_panic_write); | |
1245 | ||
5cdd929d BB |
1246 | static int mtd_check_oob_ops(struct mtd_info *mtd, loff_t offs, |
1247 | struct mtd_oob_ops *ops) | |
1248 | { | |
1249 | /* | |
1250 | * Some users are setting ->datbuf or ->oobbuf to NULL, but are leaving | |
1251 | * ->len or ->ooblen uninitialized. Force ->len and ->ooblen to 0 in | |
1252 | * this case. | |
1253 | */ | |
1254 | if (!ops->datbuf) | |
1255 | ops->len = 0; | |
1256 | ||
1257 | if (!ops->oobbuf) | |
1258 | ops->ooblen = 0; | |
1259 | ||
d82c3682 | 1260 | if (offs < 0 || offs + ops->len > mtd->size) |
5cdd929d BB |
1261 | return -EINVAL; |
1262 | ||
1263 | if (ops->ooblen) { | |
89f706db | 1264 | size_t maxooblen; |
5cdd929d BB |
1265 | |
1266 | if (ops->ooboffs >= mtd_oobavail(mtd, ops)) | |
1267 | return -EINVAL; | |
1268 | ||
89f706db MR |
1269 | maxooblen = ((size_t)(mtd_div_by_ws(mtd->size, mtd) - |
1270 | mtd_div_by_ws(offs, mtd)) * | |
5cdd929d BB |
1271 | mtd_oobavail(mtd, ops)) - ops->ooboffs; |
1272 | if (ops->ooblen > maxooblen) | |
1273 | return -EINVAL; | |
1274 | } | |
1275 | ||
1276 | return 0; | |
1277 | } | |
1278 | ||
d2d48480 BN |
1279 | int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) |
1280 | { | |
46b5889c MR |
1281 | struct mtd_info *master = mtd_get_master(mtd); |
1282 | struct mtd_ecc_stats old_stats = master->ecc_stats; | |
e47f6858 | 1283 | int ret_code; |
46b5889c | 1284 | |
d2d48480 | 1285 | ops->retlen = ops->oobretlen = 0; |
fea728c0 | 1286 | |
5cdd929d BB |
1287 | ret_code = mtd_check_oob_ops(mtd, from, ops); |
1288 | if (ret_code) | |
1289 | return ret_code; | |
1290 | ||
fea728c0 | 1291 | ledtrig_mtd_activity(); |
89fd23ef MR |
1292 | |
1293 | /* Check the validity of a potential fallback on mtd->_read */ | |
46b5889c | 1294 | if (!master->_read_oob && (!master->_read || ops->oobbuf)) |
89fd23ef MR |
1295 | return -EOPNOTSUPP; |
1296 | ||
46b5889c MR |
1297 | from = mtd_get_master_ofs(mtd, from); |
1298 | if (master->_read_oob) | |
1299 | ret_code = master->_read_oob(master, from, ops); | |
89fd23ef | 1300 | else |
46b5889c MR |
1301 | ret_code = master->_read(master, from, ops->len, &ops->retlen, |
1302 | ops->datbuf); | |
1303 | ||
1304 | mtd_update_ecc_stats(mtd, master, &old_stats); | |
89fd23ef | 1305 | |
e47f6858 BN |
1306 | /* |
1307 | * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics | |
1308 | * similar to mtd->_read(), returning a non-negative integer | |
1309 | * representing max bitflips. In other cases, mtd->_read_oob() may | |
1310 | * return -EUCLEAN. In all cases, perform similar logic to mtd_read(). | |
1311 | */ | |
e47f6858 BN |
1312 | if (unlikely(ret_code < 0)) |
1313 | return ret_code; | |
1314 | if (mtd->ecc_strength == 0) | |
1315 | return 0; /* device lacks ecc */ | |
1316 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; | |
d2d48480 BN |
1317 | } |
1318 | EXPORT_SYMBOL_GPL(mtd_read_oob); | |
1319 | ||
0c034fe3 EG |
1320 | int mtd_write_oob(struct mtd_info *mtd, loff_t to, |
1321 | struct mtd_oob_ops *ops) | |
1322 | { | |
46b5889c | 1323 | struct mtd_info *master = mtd_get_master(mtd); |
5cdd929d BB |
1324 | int ret; |
1325 | ||
0c034fe3 | 1326 | ops->retlen = ops->oobretlen = 0; |
89fd23ef | 1327 | |
0c034fe3 EG |
1328 | if (!(mtd->flags & MTD_WRITEABLE)) |
1329 | return -EROFS; | |
5cdd929d BB |
1330 | |
1331 | ret = mtd_check_oob_ops(mtd, to, ops); | |
1332 | if (ret) | |
1333 | return ret; | |
1334 | ||
fea728c0 | 1335 | ledtrig_mtd_activity(); |
89fd23ef MR |
1336 | |
1337 | /* Check the validity of a potential fallback on mtd->_write */ | |
46b5889c | 1338 | if (!master->_write_oob && (!master->_write || ops->oobbuf)) |
89fd23ef MR |
1339 | return -EOPNOTSUPP; |
1340 | ||
46b5889c MR |
1341 | to = mtd_get_master_ofs(mtd, to); |
1342 | ||
1343 | if (master->_write_oob) | |
1344 | return master->_write_oob(master, to, ops); | |
89fd23ef | 1345 | else |
46b5889c MR |
1346 | return master->_write(master, to, ops->len, &ops->retlen, |
1347 | ops->datbuf); | |
0c034fe3 EG |
1348 | } |
1349 | EXPORT_SYMBOL_GPL(mtd_write_oob); | |
1350 | ||
75eb2cec BB |
1351 | /** |
1352 | * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section | |
1353 | * @mtd: MTD device structure | |
1354 | * @section: ECC section. Depending on the layout you may have all the ECC | |
1355 | * bytes stored in a single contiguous section, or one section | |
1356 | * per ECC chunk (and sometime several sections for a single ECC | |
1357 | * ECC chunk) | |
1358 | * @oobecc: OOB region struct filled with the appropriate ECC position | |
1359 | * information | |
1360 | * | |
7da0fffb | 1361 | * This function returns ECC section information in the OOB area. If you want |
75eb2cec BB |
1362 | * to get all the ECC bytes information, then you should call |
1363 | * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE. | |
1364 | * | |
1365 | * Returns zero on success, a negative error code otherwise. | |
1366 | */ | |
1367 | int mtd_ooblayout_ecc(struct mtd_info *mtd, int section, | |
1368 | struct mtd_oob_region *oobecc) | |
1369 | { | |
46b5889c MR |
1370 | struct mtd_info *master = mtd_get_master(mtd); |
1371 | ||
75eb2cec BB |
1372 | memset(oobecc, 0, sizeof(*oobecc)); |
1373 | ||
46b5889c | 1374 | if (!master || section < 0) |
75eb2cec BB |
1375 | return -EINVAL; |
1376 | ||
46b5889c | 1377 | if (!master->ooblayout || !master->ooblayout->ecc) |
75eb2cec BB |
1378 | return -ENOTSUPP; |
1379 | ||
46b5889c | 1380 | return master->ooblayout->ecc(master, section, oobecc); |
75eb2cec BB |
1381 | } |
1382 | EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc); | |
1383 | ||
1384 | /** | |
1385 | * mtd_ooblayout_free - Get the OOB region definition of a specific free | |
1386 | * section | |
1387 | * @mtd: MTD device structure | |
1388 | * @section: Free section you are interested in. Depending on the layout | |
1389 | * you may have all the free bytes stored in a single contiguous | |
1390 | * section, or one section per ECC chunk plus an extra section | |
1391 | * for the remaining bytes (or other funky layout). | |
1392 | * @oobfree: OOB region struct filled with the appropriate free position | |
1393 | * information | |
1394 | * | |
7da0fffb | 1395 | * This function returns free bytes position in the OOB area. If you want |
75eb2cec BB |
1396 | * to get all the free bytes information, then you should call |
1397 | * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE. | |
1398 | * | |
1399 | * Returns zero on success, a negative error code otherwise. | |
1400 | */ | |
1401 | int mtd_ooblayout_free(struct mtd_info *mtd, int section, | |
1402 | struct mtd_oob_region *oobfree) | |
1403 | { | |
46b5889c MR |
1404 | struct mtd_info *master = mtd_get_master(mtd); |
1405 | ||
75eb2cec BB |
1406 | memset(oobfree, 0, sizeof(*oobfree)); |
1407 | ||
46b5889c | 1408 | if (!master || section < 0) |
75eb2cec BB |
1409 | return -EINVAL; |
1410 | ||
46b5889c | 1411 | if (!master->ooblayout || !master->ooblayout->free) |
75eb2cec BB |
1412 | return -ENOTSUPP; |
1413 | ||
46b5889c | 1414 | return master->ooblayout->free(master, section, oobfree); |
75eb2cec BB |
1415 | } |
1416 | EXPORT_SYMBOL_GPL(mtd_ooblayout_free); | |
1417 | ||
1418 | /** | |
1419 | * mtd_ooblayout_find_region - Find the region attached to a specific byte | |
1420 | * @mtd: mtd info structure | |
1421 | * @byte: the byte we are searching for | |
1422 | * @sectionp: pointer where the section id will be stored | |
1423 | * @oobregion: used to retrieve the ECC position | |
1424 | * @iter: iterator function. Should be either mtd_ooblayout_free or | |
1425 | * mtd_ooblayout_ecc depending on the region type you're searching for | |
1426 | * | |
7da0fffb | 1427 | * This function returns the section id and oobregion information of a |
75eb2cec BB |
1428 | * specific byte. For example, say you want to know where the 4th ECC byte is |
1429 | * stored, you'll use: | |
1430 | * | |
1431 | * mtd_ooblayout_find_region(mtd, 3, §ion, &oobregion, mtd_ooblayout_ecc); | |
1432 | * | |
1433 | * Returns zero on success, a negative error code otherwise. | |
1434 | */ | |
1435 | static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte, | |
1436 | int *sectionp, struct mtd_oob_region *oobregion, | |
1437 | int (*iter)(struct mtd_info *, | |
1438 | int section, | |
1439 | struct mtd_oob_region *oobregion)) | |
1440 | { | |
1441 | int pos = 0, ret, section = 0; | |
1442 | ||
1443 | memset(oobregion, 0, sizeof(*oobregion)); | |
1444 | ||
1445 | while (1) { | |
1446 | ret = iter(mtd, section, oobregion); | |
1447 | if (ret) | |
1448 | return ret; | |
1449 | ||
1450 | if (pos + oobregion->length > byte) | |
1451 | break; | |
1452 | ||
1453 | pos += oobregion->length; | |
1454 | section++; | |
1455 | } | |
1456 | ||
1457 | /* | |
1458 | * Adjust region info to make it start at the beginning at the | |
1459 | * 'start' ECC byte. | |
1460 | */ | |
1461 | oobregion->offset += byte - pos; | |
1462 | oobregion->length -= byte - pos; | |
1463 | *sectionp = section; | |
1464 | ||
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | /** | |
1469 | * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific | |
1470 | * ECC byte | |
1471 | * @mtd: mtd info structure | |
1472 | * @eccbyte: the byte we are searching for | |
1473 | * @sectionp: pointer where the section id will be stored | |
1474 | * @oobregion: OOB region information | |
1475 | * | |
1476 | * Works like mtd_ooblayout_find_region() except it searches for a specific ECC | |
1477 | * byte. | |
1478 | * | |
1479 | * Returns zero on success, a negative error code otherwise. | |
1480 | */ | |
1481 | int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte, | |
1482 | int *section, | |
1483 | struct mtd_oob_region *oobregion) | |
1484 | { | |
1485 | return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion, | |
1486 | mtd_ooblayout_ecc); | |
1487 | } | |
1488 | EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion); | |
1489 | ||
1490 | /** | |
1491 | * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer | |
1492 | * @mtd: mtd info structure | |
1493 | * @buf: destination buffer to store OOB bytes | |
1494 | * @oobbuf: OOB buffer | |
1495 | * @start: first byte to retrieve | |
1496 | * @nbytes: number of bytes to retrieve | |
1497 | * @iter: section iterator | |
1498 | * | |
1499 | * Extract bytes attached to a specific category (ECC or free) | |
1500 | * from the OOB buffer and copy them into buf. | |
1501 | * | |
1502 | * Returns zero on success, a negative error code otherwise. | |
1503 | */ | |
1504 | static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf, | |
1505 | const u8 *oobbuf, int start, int nbytes, | |
1506 | int (*iter)(struct mtd_info *, | |
1507 | int section, | |
1508 | struct mtd_oob_region *oobregion)) | |
1509 | { | |
8e8fd4d1 MY |
1510 | struct mtd_oob_region oobregion; |
1511 | int section, ret; | |
75eb2cec BB |
1512 | |
1513 | ret = mtd_ooblayout_find_region(mtd, start, §ion, | |
1514 | &oobregion, iter); | |
1515 | ||
1516 | while (!ret) { | |
1517 | int cnt; | |
1518 | ||
7c295ef9 | 1519 | cnt = min_t(int, nbytes, oobregion.length); |
75eb2cec BB |
1520 | memcpy(buf, oobbuf + oobregion.offset, cnt); |
1521 | buf += cnt; | |
1522 | nbytes -= cnt; | |
1523 | ||
1524 | if (!nbytes) | |
1525 | break; | |
1526 | ||
1527 | ret = iter(mtd, ++section, &oobregion); | |
1528 | } | |
1529 | ||
1530 | return ret; | |
1531 | } | |
1532 | ||
1533 | /** | |
1534 | * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer | |
1535 | * @mtd: mtd info structure | |
1536 | * @buf: source buffer to get OOB bytes from | |
1537 | * @oobbuf: OOB buffer | |
1538 | * @start: first OOB byte to set | |
1539 | * @nbytes: number of OOB bytes to set | |
1540 | * @iter: section iterator | |
1541 | * | |
1542 | * Fill the OOB buffer with data provided in buf. The category (ECC or free) | |
1543 | * is selected by passing the appropriate iterator. | |
1544 | * | |
1545 | * Returns zero on success, a negative error code otherwise. | |
1546 | */ | |
1547 | static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf, | |
1548 | u8 *oobbuf, int start, int nbytes, | |
1549 | int (*iter)(struct mtd_info *, | |
1550 | int section, | |
1551 | struct mtd_oob_region *oobregion)) | |
1552 | { | |
8e8fd4d1 MY |
1553 | struct mtd_oob_region oobregion; |
1554 | int section, ret; | |
75eb2cec BB |
1555 | |
1556 | ret = mtd_ooblayout_find_region(mtd, start, §ion, | |
1557 | &oobregion, iter); | |
1558 | ||
1559 | while (!ret) { | |
1560 | int cnt; | |
1561 | ||
7c295ef9 | 1562 | cnt = min_t(int, nbytes, oobregion.length); |
75eb2cec BB |
1563 | memcpy(oobbuf + oobregion.offset, buf, cnt); |
1564 | buf += cnt; | |
1565 | nbytes -= cnt; | |
1566 | ||
1567 | if (!nbytes) | |
1568 | break; | |
1569 | ||
1570 | ret = iter(mtd, ++section, &oobregion); | |
1571 | } | |
1572 | ||
1573 | return ret; | |
1574 | } | |
1575 | ||
1576 | /** | |
1577 | * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category | |
1578 | * @mtd: mtd info structure | |
1579 | * @iter: category iterator | |
1580 | * | |
1581 | * Count the number of bytes in a given category. | |
1582 | * | |
1583 | * Returns a positive value on success, a negative error code otherwise. | |
1584 | */ | |
1585 | static int mtd_ooblayout_count_bytes(struct mtd_info *mtd, | |
1586 | int (*iter)(struct mtd_info *, | |
1587 | int section, | |
1588 | struct mtd_oob_region *oobregion)) | |
1589 | { | |
4d6aecfb | 1590 | struct mtd_oob_region oobregion; |
75eb2cec BB |
1591 | int section = 0, ret, nbytes = 0; |
1592 | ||
1593 | while (1) { | |
1594 | ret = iter(mtd, section++, &oobregion); | |
1595 | if (ret) { | |
1596 | if (ret == -ERANGE) | |
1597 | ret = nbytes; | |
1598 | break; | |
1599 | } | |
1600 | ||
1601 | nbytes += oobregion.length; | |
1602 | } | |
1603 | ||
1604 | return ret; | |
1605 | } | |
1606 | ||
1607 | /** | |
1608 | * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer | |
1609 | * @mtd: mtd info structure | |
1610 | * @eccbuf: destination buffer to store ECC bytes | |
1611 | * @oobbuf: OOB buffer | |
1612 | * @start: first ECC byte to retrieve | |
1613 | * @nbytes: number of ECC bytes to retrieve | |
1614 | * | |
1615 | * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes. | |
1616 | * | |
1617 | * Returns zero on success, a negative error code otherwise. | |
1618 | */ | |
1619 | int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf, | |
1620 | const u8 *oobbuf, int start, int nbytes) | |
1621 | { | |
1622 | return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes, | |
1623 | mtd_ooblayout_ecc); | |
1624 | } | |
1625 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes); | |
1626 | ||
1627 | /** | |
1628 | * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer | |
1629 | * @mtd: mtd info structure | |
1630 | * @eccbuf: source buffer to get ECC bytes from | |
1631 | * @oobbuf: OOB buffer | |
1632 | * @start: first ECC byte to set | |
1633 | * @nbytes: number of ECC bytes to set | |
1634 | * | |
1635 | * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes. | |
1636 | * | |
1637 | * Returns zero on success, a negative error code otherwise. | |
1638 | */ | |
1639 | int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf, | |
1640 | u8 *oobbuf, int start, int nbytes) | |
1641 | { | |
1642 | return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes, | |
1643 | mtd_ooblayout_ecc); | |
1644 | } | |
1645 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes); | |
1646 | ||
1647 | /** | |
1648 | * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer | |
1649 | * @mtd: mtd info structure | |
1650 | * @databuf: destination buffer to store ECC bytes | |
1651 | * @oobbuf: OOB buffer | |
1652 | * @start: first ECC byte to retrieve | |
1653 | * @nbytes: number of ECC bytes to retrieve | |
1654 | * | |
1655 | * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. | |
1656 | * | |
1657 | * Returns zero on success, a negative error code otherwise. | |
1658 | */ | |
1659 | int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf, | |
1660 | const u8 *oobbuf, int start, int nbytes) | |
1661 | { | |
1662 | return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes, | |
1663 | mtd_ooblayout_free); | |
1664 | } | |
1665 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes); | |
1666 | ||
1667 | /** | |
c77a9312 | 1668 | * mtd_ooblayout_set_databytes - set data bytes into the oob buffer |
75eb2cec | 1669 | * @mtd: mtd info structure |
c77a9312 | 1670 | * @databuf: source buffer to get data bytes from |
75eb2cec BB |
1671 | * @oobbuf: OOB buffer |
1672 | * @start: first ECC byte to set | |
1673 | * @nbytes: number of ECC bytes to set | |
1674 | * | |
1675 | * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. | |
1676 | * | |
1677 | * Returns zero on success, a negative error code otherwise. | |
1678 | */ | |
1679 | int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf, | |
1680 | u8 *oobbuf, int start, int nbytes) | |
1681 | { | |
1682 | return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes, | |
1683 | mtd_ooblayout_free); | |
1684 | } | |
1685 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes); | |
1686 | ||
1687 | /** | |
1688 | * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB | |
1689 | * @mtd: mtd info structure | |
1690 | * | |
1691 | * Works like mtd_ooblayout_count_bytes(), except it count free bytes. | |
1692 | * | |
1693 | * Returns zero on success, a negative error code otherwise. | |
1694 | */ | |
1695 | int mtd_ooblayout_count_freebytes(struct mtd_info *mtd) | |
1696 | { | |
1697 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free); | |
1698 | } | |
1699 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes); | |
1700 | ||
1701 | /** | |
c77a9312 | 1702 | * mtd_ooblayout_count_eccbytes - count the number of ECC bytes in OOB |
75eb2cec BB |
1703 | * @mtd: mtd info structure |
1704 | * | |
1705 | * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes. | |
1706 | * | |
1707 | * Returns zero on success, a negative error code otherwise. | |
1708 | */ | |
1709 | int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd) | |
1710 | { | |
1711 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc); | |
1712 | } | |
1713 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes); | |
1714 | ||
de3cac93 AB |
1715 | /* |
1716 | * Method to access the protection register area, present in some flash | |
1717 | * devices. The user data is one time programmable but the factory data is read | |
1718 | * only. | |
1719 | */ | |
4b78fc42 CR |
1720 | int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
1721 | struct otp_info *buf) | |
de3cac93 | 1722 | { |
46b5889c MR |
1723 | struct mtd_info *master = mtd_get_master(mtd); |
1724 | ||
1725 | if (!master->_get_fact_prot_info) | |
de3cac93 AB |
1726 | return -EOPNOTSUPP; |
1727 | if (!len) | |
1728 | return 0; | |
46b5889c | 1729 | return master->_get_fact_prot_info(master, len, retlen, buf); |
de3cac93 AB |
1730 | } |
1731 | EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info); | |
1732 | ||
1733 | int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
1734 | size_t *retlen, u_char *buf) | |
1735 | { | |
46b5889c MR |
1736 | struct mtd_info *master = mtd_get_master(mtd); |
1737 | ||
de3cac93 | 1738 | *retlen = 0; |
46b5889c | 1739 | if (!master->_read_fact_prot_reg) |
de3cac93 AB |
1740 | return -EOPNOTSUPP; |
1741 | if (!len) | |
1742 | return 0; | |
46b5889c | 1743 | return master->_read_fact_prot_reg(master, from, len, retlen, buf); |
de3cac93 AB |
1744 | } |
1745 | EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg); | |
1746 | ||
4b78fc42 CR |
1747 | int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
1748 | struct otp_info *buf) | |
de3cac93 | 1749 | { |
46b5889c MR |
1750 | struct mtd_info *master = mtd_get_master(mtd); |
1751 | ||
1752 | if (!master->_get_user_prot_info) | |
de3cac93 AB |
1753 | return -EOPNOTSUPP; |
1754 | if (!len) | |
1755 | return 0; | |
46b5889c | 1756 | return master->_get_user_prot_info(master, len, retlen, buf); |
de3cac93 AB |
1757 | } |
1758 | EXPORT_SYMBOL_GPL(mtd_get_user_prot_info); | |
1759 | ||
1760 | int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
1761 | size_t *retlen, u_char *buf) | |
1762 | { | |
46b5889c MR |
1763 | struct mtd_info *master = mtd_get_master(mtd); |
1764 | ||
de3cac93 | 1765 | *retlen = 0; |
46b5889c | 1766 | if (!master->_read_user_prot_reg) |
de3cac93 AB |
1767 | return -EOPNOTSUPP; |
1768 | if (!len) | |
1769 | return 0; | |
46b5889c | 1770 | return master->_read_user_prot_reg(master, from, len, retlen, buf); |
de3cac93 AB |
1771 | } |
1772 | EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg); | |
1773 | ||
1774 | int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, | |
1775 | size_t *retlen, u_char *buf) | |
1776 | { | |
46b5889c | 1777 | struct mtd_info *master = mtd_get_master(mtd); |
9a78bc83 CR |
1778 | int ret; |
1779 | ||
de3cac93 | 1780 | *retlen = 0; |
46b5889c | 1781 | if (!master->_write_user_prot_reg) |
de3cac93 AB |
1782 | return -EOPNOTSUPP; |
1783 | if (!len) | |
1784 | return 0; | |
46b5889c | 1785 | ret = master->_write_user_prot_reg(master, to, len, retlen, buf); |
9a78bc83 CR |
1786 | if (ret) |
1787 | return ret; | |
1788 | ||
1789 | /* | |
1790 | * If no data could be written at all, we are out of memory and | |
1791 | * must return -ENOSPC. | |
1792 | */ | |
1793 | return (*retlen) ? 0 : -ENOSPC; | |
de3cac93 AB |
1794 | } |
1795 | EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg); | |
1796 | ||
1797 | int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) | |
1798 | { | |
46b5889c MR |
1799 | struct mtd_info *master = mtd_get_master(mtd); |
1800 | ||
1801 | if (!master->_lock_user_prot_reg) | |
de3cac93 AB |
1802 | return -EOPNOTSUPP; |
1803 | if (!len) | |
1804 | return 0; | |
46b5889c | 1805 | return master->_lock_user_prot_reg(master, from, len); |
de3cac93 AB |
1806 | } |
1807 | EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg); | |
1808 | ||
8273a0c9 AB |
1809 | /* Chip-supported device locking */ |
1810 | int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
1811 | { | |
46b5889c MR |
1812 | struct mtd_info *master = mtd_get_master(mtd); |
1813 | ||
1814 | if (!master->_lock) | |
8273a0c9 | 1815 | return -EOPNOTSUPP; |
0c2b4e21 | 1816 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c9 | 1817 | return -EINVAL; |
bcb1d238 AB |
1818 | if (!len) |
1819 | return 0; | |
46b5889c | 1820 | return master->_lock(master, mtd_get_master_ofs(mtd, ofs), len); |
8273a0c9 AB |
1821 | } |
1822 | EXPORT_SYMBOL_GPL(mtd_lock); | |
1823 | ||
1824 | int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
1825 | { | |
46b5889c MR |
1826 | struct mtd_info *master = mtd_get_master(mtd); |
1827 | ||
1828 | if (!master->_unlock) | |
8273a0c9 | 1829 | return -EOPNOTSUPP; |
0c2b4e21 | 1830 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c9 | 1831 | return -EINVAL; |
bcb1d238 AB |
1832 | if (!len) |
1833 | return 0; | |
46b5889c | 1834 | return master->_unlock(master, mtd_get_master_ofs(mtd, ofs), len); |
8273a0c9 AB |
1835 | } |
1836 | EXPORT_SYMBOL_GPL(mtd_unlock); | |
1837 | ||
1838 | int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
1839 | { | |
46b5889c MR |
1840 | struct mtd_info *master = mtd_get_master(mtd); |
1841 | ||
1842 | if (!master->_is_locked) | |
8273a0c9 | 1843 | return -EOPNOTSUPP; |
0c2b4e21 | 1844 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c9 | 1845 | return -EINVAL; |
bcb1d238 AB |
1846 | if (!len) |
1847 | return 0; | |
46b5889c | 1848 | return master->_is_locked(master, mtd_get_master_ofs(mtd, ofs), len); |
8273a0c9 AB |
1849 | } |
1850 | EXPORT_SYMBOL_GPL(mtd_is_locked); | |
1851 | ||
8471bb73 | 1852 | int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs) |
8273a0c9 | 1853 | { |
46b5889c MR |
1854 | struct mtd_info *master = mtd_get_master(mtd); |
1855 | ||
0c2b4e21 | 1856 | if (ofs < 0 || ofs >= mtd->size) |
8471bb73 | 1857 | return -EINVAL; |
46b5889c | 1858 | if (!master->_block_isreserved) |
8273a0c9 | 1859 | return 0; |
46b5889c | 1860 | return master->_block_isreserved(master, mtd_get_master_ofs(mtd, ofs)); |
8471bb73 EG |
1861 | } |
1862 | EXPORT_SYMBOL_GPL(mtd_block_isreserved); | |
1863 | ||
1864 | int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) | |
1865 | { | |
46b5889c MR |
1866 | struct mtd_info *master = mtd_get_master(mtd); |
1867 | ||
0c2b4e21 | 1868 | if (ofs < 0 || ofs >= mtd->size) |
8273a0c9 | 1869 | return -EINVAL; |
46b5889c | 1870 | if (!master->_block_isbad) |
8471bb73 | 1871 | return 0; |
46b5889c | 1872 | return master->_block_isbad(master, mtd_get_master_ofs(mtd, ofs)); |
8273a0c9 AB |
1873 | } |
1874 | EXPORT_SYMBOL_GPL(mtd_block_isbad); | |
1875 | ||
1876 | int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
1877 | { | |
46b5889c MR |
1878 | struct mtd_info *master = mtd_get_master(mtd); |
1879 | int ret; | |
1880 | ||
1881 | if (!master->_block_markbad) | |
8273a0c9 | 1882 | return -EOPNOTSUPP; |
0c2b4e21 | 1883 | if (ofs < 0 || ofs >= mtd->size) |
8273a0c9 | 1884 | return -EINVAL; |
664addc2 AB |
1885 | if (!(mtd->flags & MTD_WRITEABLE)) |
1886 | return -EROFS; | |
46b5889c MR |
1887 | |
1888 | ret = master->_block_markbad(master, mtd_get_master_ofs(mtd, ofs)); | |
1889 | if (ret) | |
1890 | return ret; | |
1891 | ||
1892 | while (mtd->parent) { | |
1893 | mtd->ecc_stats.badblocks++; | |
1894 | mtd = mtd->parent; | |
1895 | } | |
1896 | ||
1897 | return 0; | |
8273a0c9 AB |
1898 | } |
1899 | EXPORT_SYMBOL_GPL(mtd_block_markbad); | |
1900 | ||
52b02031 AB |
1901 | /* |
1902 | * default_mtd_writev - the default writev method | |
1903 | * @mtd: mtd device description object pointer | |
1904 | * @vecs: the vectors to write | |
1905 | * @count: count of vectors in @vecs | |
1906 | * @to: the MTD device offset to write to | |
1907 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
1908 | * | |
1909 | * This function returns zero in case of success and a negative error code in | |
1910 | * case of failure. | |
1da177e4 | 1911 | */ |
1dbebd32 AB |
1912 | static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, |
1913 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 LT |
1914 | { |
1915 | unsigned long i; | |
1916 | size_t totlen = 0, thislen; | |
1917 | int ret = 0; | |
1918 | ||
52b02031 AB |
1919 | for (i = 0; i < count; i++) { |
1920 | if (!vecs[i].iov_len) | |
1921 | continue; | |
1922 | ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen, | |
1923 | vecs[i].iov_base); | |
1924 | totlen += thislen; | |
1925 | if (ret || thislen != vecs[i].iov_len) | |
1926 | break; | |
1927 | to += vecs[i].iov_len; | |
1da177e4 | 1928 | } |
52b02031 | 1929 | *retlen = totlen; |
1da177e4 LT |
1930 | return ret; |
1931 | } | |
1dbebd32 AB |
1932 | |
1933 | /* | |
1934 | * mtd_writev - the vector-based MTD write method | |
1935 | * @mtd: mtd device description object pointer | |
1936 | * @vecs: the vectors to write | |
1937 | * @count: count of vectors in @vecs | |
1938 | * @to: the MTD device offset to write to | |
1939 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
1940 | * | |
1941 | * This function returns zero in case of success and a negative error code in | |
1942 | * case of failure. | |
1943 | */ | |
1944 | int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
1945 | unsigned long count, loff_t to, size_t *retlen) | |
1946 | { | |
46b5889c MR |
1947 | struct mtd_info *master = mtd_get_master(mtd); |
1948 | ||
1dbebd32 | 1949 | *retlen = 0; |
664addc2 AB |
1950 | if (!(mtd->flags & MTD_WRITEABLE)) |
1951 | return -EROFS; | |
46b5889c MR |
1952 | |
1953 | if (!master->_writev) | |
1dbebd32 | 1954 | return default_mtd_writev(mtd, vecs, count, to, retlen); |
46b5889c MR |
1955 | |
1956 | return master->_writev(master, vecs, count, | |
1957 | mtd_get_master_ofs(mtd, to), retlen); | |
1dbebd32 AB |
1958 | } |
1959 | EXPORT_SYMBOL_GPL(mtd_writev); | |
1da177e4 | 1960 | |
33b53716 GE |
1961 | /** |
1962 | * mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size | |
52b02031 AB |
1963 | * @mtd: mtd device description object pointer |
1964 | * @size: a pointer to the ideal or maximum size of the allocation, points | |
33b53716 GE |
1965 | * to the actual allocation size on success. |
1966 | * | |
1967 | * This routine attempts to allocate a contiguous kernel buffer up to | |
1968 | * the specified size, backing off the size of the request exponentially | |
1969 | * until the request succeeds or until the allocation size falls below | |
1970 | * the system page size. This attempts to make sure it does not adversely | |
1971 | * impact system performance, so when allocating more than one page, we | |
caf49191 LT |
1972 | * ask the memory allocator to avoid re-trying, swapping, writing back |
1973 | * or performing I/O. | |
33b53716 GE |
1974 | * |
1975 | * Note, this function also makes sure that the allocated buffer is aligned to | |
1976 | * the MTD device's min. I/O unit, i.e. the "mtd->writesize" value. | |
1977 | * | |
1978 | * This is called, for example by mtd_{read,write} and jffs2_scan_medium, | |
1979 | * to handle smaller (i.e. degraded) buffer allocations under low- or | |
1980 | * fragmented-memory situations where such reduced allocations, from a | |
1981 | * requested ideal, are allowed. | |
1982 | * | |
1983 | * Returns a pointer to the allocated buffer on success; otherwise, NULL. | |
1984 | */ | |
1985 | void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size) | |
1986 | { | |
d0164adc | 1987 | gfp_t flags = __GFP_NOWARN | __GFP_DIRECT_RECLAIM | __GFP_NORETRY; |
33b53716 GE |
1988 | size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE); |
1989 | void *kbuf; | |
1990 | ||
1991 | *size = min_t(size_t, *size, KMALLOC_MAX_SIZE); | |
1992 | ||
1993 | while (*size > min_alloc) { | |
1994 | kbuf = kmalloc(*size, flags); | |
1995 | if (kbuf) | |
1996 | return kbuf; | |
1997 | ||
1998 | *size >>= 1; | |
1999 | *size = ALIGN(*size, mtd->writesize); | |
2000 | } | |
2001 | ||
2002 | /* | |
2003 | * For the last resort allocation allow 'kmalloc()' to do all sorts of | |
2004 | * things (write-back, dropping caches, etc) by using GFP_KERNEL. | |
2005 | */ | |
2006 | return kmalloc(*size, GFP_KERNEL); | |
2007 | } | |
33b53716 | 2008 | EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to); |
1da177e4 | 2009 | |
2d2dce0e PM |
2010 | #ifdef CONFIG_PROC_FS |
2011 | ||
1da177e4 LT |
2012 | /*====================================================================*/ |
2013 | /* Support for /proc/mtd */ | |
2014 | ||
447d9bd8 | 2015 | static int mtd_proc_show(struct seq_file *m, void *v) |
1da177e4 | 2016 | { |
f1332ba2 | 2017 | struct mtd_info *mtd; |
1da177e4 | 2018 | |
447d9bd8 | 2019 | seq_puts(m, "dev: size erasesize name\n"); |
48b19268 | 2020 | mutex_lock(&mtd_table_mutex); |
f1332ba2 | 2021 | mtd_for_each_device(mtd) { |
447d9bd8 AD |
2022 | seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\"\n", |
2023 | mtd->index, (unsigned long long)mtd->size, | |
2024 | mtd->erasesize, mtd->name); | |
d5ca5129 | 2025 | } |
48b19268 | 2026 | mutex_unlock(&mtd_table_mutex); |
d5ca5129 | 2027 | return 0; |
1da177e4 | 2028 | } |
45b09076 KC |
2029 | #endif /* CONFIG_PROC_FS */ |
2030 | ||
1da177e4 LT |
2031 | /*====================================================================*/ |
2032 | /* Init code */ | |
2033 | ||
445caaa2 | 2034 | static struct backing_dev_info * __init mtd_bdi_init(char *name) |
0661b1ac | 2035 | { |
445caaa2 | 2036 | struct backing_dev_info *bdi; |
0661b1ac JA |
2037 | int ret; |
2038 | ||
fa06052d | 2039 | bdi = bdi_alloc(GFP_KERNEL); |
445caaa2 SL |
2040 | if (!bdi) |
2041 | return ERR_PTR(-ENOMEM); | |
0661b1ac | 2042 | |
fa06052d JK |
2043 | bdi->name = name; |
2044 | /* | |
2045 | * We put '-0' suffix to the name to get the same name format as we | |
2046 | * used to get. Since this is called only once, we get a unique name. | |
2047 | */ | |
7c4cc300 | 2048 | ret = bdi_register(bdi, "%.28s-0", name); |
0661b1ac | 2049 | if (ret) |
fa06052d | 2050 | bdi_put(bdi); |
0661b1ac | 2051 | |
445caaa2 | 2052 | return ret ? ERR_PTR(ret) : bdi; |
0661b1ac JA |
2053 | } |
2054 | ||
93e56214 AB |
2055 | static struct proc_dir_entry *proc_mtd; |
2056 | ||
1da177e4 LT |
2057 | static int __init init_mtd(void) |
2058 | { | |
15bce40c | 2059 | int ret; |
0661b1ac | 2060 | |
15bce40c | 2061 | ret = class_register(&mtd_class); |
0661b1ac JA |
2062 | if (ret) |
2063 | goto err_reg; | |
2064 | ||
445caaa2 SL |
2065 | mtd_bdi = mtd_bdi_init("mtd"); |
2066 | if (IS_ERR(mtd_bdi)) { | |
2067 | ret = PTR_ERR(mtd_bdi); | |
b4caecd4 | 2068 | goto err_bdi; |
445caaa2 | 2069 | } |
694bb7fc | 2070 | |
3f3942ac | 2071 | proc_mtd = proc_create_single("mtd", 0, NULL, mtd_proc_show); |
93e56214 | 2072 | |
660685d9 AB |
2073 | ret = init_mtdchar(); |
2074 | if (ret) | |
2075 | goto out_procfs; | |
2076 | ||
e8e3edb9 MR |
2077 | dfs_dir_mtd = debugfs_create_dir("mtd", NULL); |
2078 | ||
1da177e4 | 2079 | return 0; |
0661b1ac | 2080 | |
660685d9 AB |
2081 | out_procfs: |
2082 | if (proc_mtd) | |
2083 | remove_proc_entry("mtd", NULL); | |
fa06052d | 2084 | bdi_put(mtd_bdi); |
b4caecd4 | 2085 | err_bdi: |
0661b1ac JA |
2086 | class_unregister(&mtd_class); |
2087 | err_reg: | |
2088 | pr_err("Error registering mtd class or bdi: %d\n", ret); | |
2089 | return ret; | |
1da177e4 LT |
2090 | } |
2091 | ||
2092 | static void __exit cleanup_mtd(void) | |
2093 | { | |
e8e3edb9 | 2094 | debugfs_remove_recursive(dfs_dir_mtd); |
660685d9 | 2095 | cleanup_mtdchar(); |
d5ca5129 | 2096 | if (proc_mtd) |
93e56214 | 2097 | remove_proc_entry("mtd", NULL); |
15bce40c | 2098 | class_unregister(&mtd_class); |
fa06052d | 2099 | bdi_put(mtd_bdi); |
35667b99 | 2100 | idr_destroy(&mtd_idr); |
1da177e4 LT |
2101 | } |
2102 | ||
2103 | module_init(init_mtd); | |
2104 | module_exit(cleanup_mtd); | |
2105 | ||
1da177e4 LT |
2106 | MODULE_LICENSE("GPL"); |
2107 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
2108 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |