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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> |
3b270fac | 26 | #include <linux/random.h> |
0d01ff25 | 27 | #include <linux/slab.h> |
3efe41be | 28 | #include <linux/reboot.h> |
fea728c0 | 29 | #include <linux/leds.h> |
e8e3edb9 | 30 | #include <linux/debugfs.h> |
c4dfa25a | 31 | #include <linux/nvmem-provider.h> |
26422ac7 | 32 | #include <linux/root_dev.h> |
1da177e4 LT |
33 | |
34 | #include <linux/mtd/mtd.h> | |
f5671ab3 | 35 | #include <linux/mtd/partitions.h> |
1da177e4 | 36 | |
356d70f1 | 37 | #include "mtdcore.h" |
660685d9 | 38 | |
fa06052d | 39 | struct backing_dev_info *mtd_bdi; |
356d70f1 | 40 | |
57b8045d LPC |
41 | #ifdef CONFIG_PM_SLEEP |
42 | ||
43 | static int mtd_cls_suspend(struct device *dev) | |
44 | { | |
45 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
46 | ||
47 | return mtd ? mtd_suspend(mtd) : 0; | |
48 | } | |
49 | ||
50 | static int mtd_cls_resume(struct device *dev) | |
51 | { | |
52 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
53 | ||
54 | if (mtd) | |
55 | mtd_resume(mtd); | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static SIMPLE_DEV_PM_OPS(mtd_cls_pm_ops, mtd_cls_suspend, mtd_cls_resume); | |
60 | #define MTD_CLS_PM_OPS (&mtd_cls_pm_ops) | |
61 | #else | |
62 | #define MTD_CLS_PM_OPS NULL | |
63 | #endif | |
15bce40c DW |
64 | |
65 | static struct class mtd_class = { | |
66 | .name = "mtd", | |
57b8045d | 67 | .pm = MTD_CLS_PM_OPS, |
15bce40c | 68 | }; |
1f24b5a8 | 69 | |
b520e412 BH |
70 | static DEFINE_IDR(mtd_idr); |
71 | ||
97894cda | 72 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
1da177e4 | 73 | should not use them for _anything_ else */ |
48b19268 | 74 | DEFINE_MUTEX(mtd_table_mutex); |
1da177e4 | 75 | EXPORT_SYMBOL_GPL(mtd_table_mutex); |
b520e412 BH |
76 | |
77 | struct mtd_info *__mtd_next_device(int i) | |
78 | { | |
79 | return idr_get_next(&mtd_idr, &i); | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(__mtd_next_device); | |
1da177e4 LT |
82 | |
83 | static LIST_HEAD(mtd_notifiers); | |
84 | ||
1f24b5a8 | 85 | |
1f24b5a8 | 86 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) |
1f24b5a8 DB |
87 | |
88 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
89 | * the mtd_info will probably want to use the release() hook... | |
90 | */ | |
91 | static void mtd_release(struct device *dev) | |
92 | { | |
5e472128 | 93 | struct mtd_info *mtd = dev_get_drvdata(dev); |
d5de20a9 | 94 | dev_t index = MTD_DEVT(mtd->index); |
1f24b5a8 | 95 | |
e9714c22 AU |
96 | idr_remove(&mtd_idr, mtd->index); |
97 | of_node_put(mtd_get_of_node(mtd)); | |
98 | ||
19bfa9eb TW |
99 | if (mtd_is_partition(mtd)) |
100 | release_mtd_partition(mtd); | |
101 | ||
5e472128 BN |
102 | /* remove /dev/mtdXro node */ |
103 | device_destroy(&mtd_class, index + 1); | |
15bce40c DW |
104 | } |
105 | ||
19bfa9eb TW |
106 | static void mtd_device_release(struct kref *kref) |
107 | { | |
108 | struct mtd_info *mtd = container_of(kref, struct mtd_info, refcnt); | |
e9714c22 | 109 | bool is_partition = mtd_is_partition(mtd); |
19bfa9eb TW |
110 | |
111 | debugfs_remove_recursive(mtd->dbg.dfs_dir); | |
112 | ||
113 | /* Try to remove the NVMEM provider */ | |
114 | nvmem_unregister(mtd->nvmem); | |
115 | ||
116 | device_unregister(&mtd->dev); | |
117 | ||
e9714c22 AU |
118 | /* |
119 | * Clear dev so mtd can be safely re-registered later if desired. | |
120 | * Should not be done for partition, | |
121 | * as it was already destroyed in device_unregister(). | |
122 | */ | |
123 | if (!is_partition) | |
124 | memset(&mtd->dev, 0, sizeof(mtd->dev)); | |
19bfa9eb TW |
125 | |
126 | module_put(THIS_MODULE); | |
127 | } | |
128 | ||
b4e24863 ZL |
129 | #define MTD_DEVICE_ATTR_RO(name) \ |
130 | static DEVICE_ATTR(name, 0444, mtd_##name##_show, NULL) | |
131 | ||
132 | #define MTD_DEVICE_ATTR_RW(name) \ | |
133 | static DEVICE_ATTR(name, 0644, mtd_##name##_show, mtd_##name##_store) | |
134 | ||
1f24b5a8 DB |
135 | static ssize_t mtd_type_show(struct device *dev, |
136 | struct device_attribute *attr, char *buf) | |
137 | { | |
d5de20a9 | 138 | struct mtd_info *mtd = dev_get_drvdata(dev); |
1f24b5a8 DB |
139 | char *type; |
140 | ||
141 | switch (mtd->type) { | |
142 | case MTD_ABSENT: | |
143 | type = "absent"; | |
144 | break; | |
145 | case MTD_RAM: | |
146 | type = "ram"; | |
147 | break; | |
148 | case MTD_ROM: | |
149 | type = "rom"; | |
150 | break; | |
151 | case MTD_NORFLASH: | |
152 | type = "nor"; | |
153 | break; | |
154 | case MTD_NANDFLASH: | |
155 | type = "nand"; | |
156 | break; | |
157 | case MTD_DATAFLASH: | |
158 | type = "dataflash"; | |
159 | break; | |
160 | case MTD_UBIVOLUME: | |
161 | type = "ubi"; | |
162 | break; | |
f4837246 HS |
163 | case MTD_MLCNANDFLASH: |
164 | type = "mlc-nand"; | |
165 | break; | |
1f24b5a8 DB |
166 | default: |
167 | type = "unknown"; | |
168 | } | |
169 | ||
5b2fbe0c | 170 | return sysfs_emit(buf, "%s\n", type); |
1f24b5a8 | 171 | } |
a17da115 | 172 | MTD_DEVICE_ATTR_RO(type); |
694bb7fc KC |
173 | |
174 | static ssize_t mtd_flags_show(struct device *dev, | |
175 | struct device_attribute *attr, char *buf) | |
176 | { | |
d5de20a9 | 177 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc | 178 | |
5b2fbe0c | 179 | return sysfs_emit(buf, "0x%lx\n", (unsigned long)mtd->flags); |
694bb7fc | 180 | } |
a17da115 | 181 | MTD_DEVICE_ATTR_RO(flags); |
694bb7fc KC |
182 | |
183 | static ssize_t mtd_size_show(struct device *dev, | |
184 | struct device_attribute *attr, char *buf) | |
185 | { | |
d5de20a9 | 186 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc | 187 | |
5b2fbe0c | 188 | return sysfs_emit(buf, "%llu\n", (unsigned long long)mtd->size); |
694bb7fc | 189 | } |
a17da115 | 190 | MTD_DEVICE_ATTR_RO(size); |
694bb7fc KC |
191 | |
192 | static ssize_t mtd_erasesize_show(struct device *dev, | |
193 | struct device_attribute *attr, char *buf) | |
194 | { | |
d5de20a9 | 195 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc | 196 | |
5b2fbe0c | 197 | return sysfs_emit(buf, "%lu\n", (unsigned long)mtd->erasesize); |
694bb7fc | 198 | } |
a17da115 | 199 | MTD_DEVICE_ATTR_RO(erasesize); |
694bb7fc KC |
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 | 205 | |
5b2fbe0c | 206 | return sysfs_emit(buf, "%lu\n", (unsigned long)mtd->writesize); |
694bb7fc | 207 | } |
a17da115 | 208 | MTD_DEVICE_ATTR_RO(writesize); |
694bb7fc | 209 | |
e7693548 AB |
210 | static ssize_t mtd_subpagesize_show(struct device *dev, |
211 | struct device_attribute *attr, char *buf) | |
212 | { | |
d5de20a9 | 213 | struct mtd_info *mtd = dev_get_drvdata(dev); |
e7693548 AB |
214 | unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; |
215 | ||
5b2fbe0c | 216 | return sysfs_emit(buf, "%u\n", subpagesize); |
e7693548 | 217 | } |
a17da115 | 218 | MTD_DEVICE_ATTR_RO(subpagesize); |
e7693548 | 219 | |
694bb7fc KC |
220 | static ssize_t mtd_oobsize_show(struct device *dev, |
221 | struct device_attribute *attr, char *buf) | |
222 | { | |
d5de20a9 | 223 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc | 224 | |
5b2fbe0c | 225 | return sysfs_emit(buf, "%lu\n", (unsigned long)mtd->oobsize); |
694bb7fc | 226 | } |
a17da115 | 227 | MTD_DEVICE_ATTR_RO(oobsize); |
694bb7fc | 228 | |
7cc9aa66 XL |
229 | static ssize_t mtd_oobavail_show(struct device *dev, |
230 | struct device_attribute *attr, char *buf) | |
231 | { | |
232 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
233 | ||
5b2fbe0c | 234 | return sysfs_emit(buf, "%u\n", mtd->oobavail); |
7cc9aa66 | 235 | } |
a17da115 | 236 | MTD_DEVICE_ATTR_RO(oobavail); |
7cc9aa66 | 237 | |
694bb7fc KC |
238 | static ssize_t mtd_numeraseregions_show(struct device *dev, |
239 | struct device_attribute *attr, char *buf) | |
240 | { | |
d5de20a9 | 241 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc | 242 | |
5b2fbe0c | 243 | return sysfs_emit(buf, "%u\n", mtd->numeraseregions); |
694bb7fc | 244 | } |
a17da115 | 245 | MTD_DEVICE_ATTR_RO(numeraseregions); |
694bb7fc KC |
246 | |
247 | static ssize_t mtd_name_show(struct device *dev, | |
248 | struct device_attribute *attr, char *buf) | |
249 | { | |
d5de20a9 | 250 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc | 251 | |
5b2fbe0c | 252 | return sysfs_emit(buf, "%s\n", mtd->name); |
694bb7fc | 253 | } |
a17da115 | 254 | MTD_DEVICE_ATTR_RO(name); |
1f24b5a8 | 255 | |
a9b672e8 MD |
256 | static ssize_t mtd_ecc_strength_show(struct device *dev, |
257 | struct device_attribute *attr, char *buf) | |
258 | { | |
259 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
260 | ||
5b2fbe0c | 261 | return sysfs_emit(buf, "%u\n", mtd->ecc_strength); |
a9b672e8 | 262 | } |
a17da115 | 263 | MTD_DEVICE_ATTR_RO(ecc_strength); |
a9b672e8 | 264 | |
d062d4ed MD |
265 | static ssize_t mtd_bitflip_threshold_show(struct device *dev, |
266 | struct device_attribute *attr, | |
267 | char *buf) | |
268 | { | |
269 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
270 | ||
5b2fbe0c | 271 | return sysfs_emit(buf, "%u\n", mtd->bitflip_threshold); |
d062d4ed MD |
272 | } |
273 | ||
274 | static ssize_t mtd_bitflip_threshold_store(struct device *dev, | |
275 | struct device_attribute *attr, | |
276 | const char *buf, size_t count) | |
277 | { | |
278 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
279 | unsigned int bitflip_threshold; | |
280 | int retval; | |
281 | ||
282 | retval = kstrtouint(buf, 0, &bitflip_threshold); | |
283 | if (retval) | |
284 | return retval; | |
285 | ||
286 | mtd->bitflip_threshold = bitflip_threshold; | |
287 | return count; | |
288 | } | |
a17da115 | 289 | MTD_DEVICE_ATTR_RW(bitflip_threshold); |
d062d4ed | 290 | |
bf977e3f HS |
291 | static ssize_t mtd_ecc_step_size_show(struct device *dev, |
292 | struct device_attribute *attr, char *buf) | |
293 | { | |
294 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
295 | ||
5b2fbe0c | 296 | return sysfs_emit(buf, "%u\n", mtd->ecc_step_size); |
bf977e3f HS |
297 | |
298 | } | |
a17da115 | 299 | MTD_DEVICE_ATTR_RO(ecc_step_size); |
bf977e3f | 300 | |
a17da115 | 301 | static ssize_t mtd_corrected_bits_show(struct device *dev, |
990a3af0 EG |
302 | struct device_attribute *attr, char *buf) |
303 | { | |
304 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
305 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
306 | ||
5b2fbe0c | 307 | return sysfs_emit(buf, "%u\n", ecc_stats->corrected); |
990a3af0 | 308 | } |
a17da115 | 309 | MTD_DEVICE_ATTR_RO(corrected_bits); /* ecc stats corrected */ |
990a3af0 | 310 | |
a17da115 | 311 | static ssize_t mtd_ecc_failures_show(struct device *dev, |
990a3af0 EG |
312 | struct device_attribute *attr, char *buf) |
313 | { | |
314 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
315 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
316 | ||
5b2fbe0c | 317 | return sysfs_emit(buf, "%u\n", ecc_stats->failed); |
990a3af0 | 318 | } |
a17da115 | 319 | MTD_DEVICE_ATTR_RO(ecc_failures); /* ecc stats errors */ |
990a3af0 | 320 | |
a17da115 | 321 | static ssize_t mtd_bad_blocks_show(struct device *dev, |
990a3af0 EG |
322 | struct device_attribute *attr, char *buf) |
323 | { | |
324 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
325 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
326 | ||
5b2fbe0c | 327 | return sysfs_emit(buf, "%u\n", ecc_stats->badblocks); |
990a3af0 | 328 | } |
a17da115 | 329 | MTD_DEVICE_ATTR_RO(bad_blocks); |
990a3af0 | 330 | |
a17da115 | 331 | static ssize_t mtd_bbt_blocks_show(struct device *dev, |
990a3af0 EG |
332 | struct device_attribute *attr, char *buf) |
333 | { | |
334 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
335 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; | |
336 | ||
5b2fbe0c | 337 | return sysfs_emit(buf, "%u\n", ecc_stats->bbtblocks); |
990a3af0 | 338 | } |
a17da115 | 339 | MTD_DEVICE_ATTR_RO(bbt_blocks); |
990a3af0 | 340 | |
1f24b5a8 | 341 | static struct attribute *mtd_attrs[] = { |
694bb7fc KC |
342 | &dev_attr_type.attr, |
343 | &dev_attr_flags.attr, | |
344 | &dev_attr_size.attr, | |
345 | &dev_attr_erasesize.attr, | |
346 | &dev_attr_writesize.attr, | |
e7693548 | 347 | &dev_attr_subpagesize.attr, |
694bb7fc | 348 | &dev_attr_oobsize.attr, |
7cc9aa66 | 349 | &dev_attr_oobavail.attr, |
694bb7fc KC |
350 | &dev_attr_numeraseregions.attr, |
351 | &dev_attr_name.attr, | |
a9b672e8 | 352 | &dev_attr_ecc_strength.attr, |
bf977e3f | 353 | &dev_attr_ecc_step_size.attr, |
990a3af0 EG |
354 | &dev_attr_corrected_bits.attr, |
355 | &dev_attr_ecc_failures.attr, | |
356 | &dev_attr_bad_blocks.attr, | |
357 | &dev_attr_bbt_blocks.attr, | |
d062d4ed | 358 | &dev_attr_bitflip_threshold.attr, |
1f24b5a8 DB |
359 | NULL, |
360 | }; | |
54c738f6 | 361 | ATTRIBUTE_GROUPS(mtd); |
1f24b5a8 | 362 | |
75864b30 | 363 | static const struct device_type mtd_devtype = { |
1f24b5a8 DB |
364 | .name = "mtd", |
365 | .groups = mtd_groups, | |
366 | .release = mtd_release, | |
367 | }; | |
368 | ||
ad5e35f5 | 369 | static bool mtd_expert_analysis_mode; |
1018c94b | 370 | |
ad5e35f5 MR |
371 | #ifdef CONFIG_DEBUG_FS |
372 | bool mtd_check_expert_analysis_mode(void) | |
1018c94b | 373 | { |
ad5e35f5 MR |
374 | const char *mtd_expert_analysis_warning = |
375 | "Bad block checks have been entirely disabled.\n" | |
376 | "This is only reserved for post-mortem forensics and debug purposes.\n" | |
377 | "Never enable this mode if you do not know what you are doing!\n"; | |
1018c94b | 378 | |
ad5e35f5 | 379 | return WARN_ONCE(mtd_expert_analysis_mode, mtd_expert_analysis_warning); |
1018c94b | 380 | } |
ad5e35f5 MR |
381 | EXPORT_SYMBOL_GPL(mtd_check_expert_analysis_mode); |
382 | #endif | |
1018c94b ZL |
383 | |
384 | static struct dentry *dfs_dir_mtd; | |
385 | ||
386 | static void mtd_debugfs_populate(struct mtd_info *mtd) | |
387 | { | |
388 | struct device *dev = &mtd->dev; | |
1018c94b ZL |
389 | |
390 | if (IS_ERR_OR_NULL(dfs_dir_mtd)) | |
391 | return; | |
392 | ||
ec090a03 | 393 | mtd->dbg.dfs_dir = debugfs_create_dir(dev_name(dev), dfs_dir_mtd); |
1018c94b ZL |
394 | } |
395 | ||
b4caecd4 CH |
396 | #ifndef CONFIG_MMU |
397 | unsigned mtd_mmap_capabilities(struct mtd_info *mtd) | |
398 | { | |
399 | switch (mtd->type) { | |
400 | case MTD_RAM: | |
401 | return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | | |
402 | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
403 | case MTD_ROM: | |
404 | return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | | |
405 | NOMMU_MAP_READ; | |
406 | default: | |
407 | return NOMMU_MAP_COPY; | |
408 | } | |
409 | } | |
706a4e5a | 410 | EXPORT_SYMBOL_GPL(mtd_mmap_capabilities); |
b4caecd4 CH |
411 | #endif |
412 | ||
3efe41be BN |
413 | static int mtd_reboot_notifier(struct notifier_block *n, unsigned long state, |
414 | void *cmd) | |
415 | { | |
416 | struct mtd_info *mtd; | |
417 | ||
418 | mtd = container_of(n, struct mtd_info, reboot_notifier); | |
419 | mtd->_reboot(mtd); | |
420 | ||
421 | return NOTIFY_DONE; | |
422 | } | |
423 | ||
477b0229 BB |
424 | /** |
425 | * mtd_wunit_to_pairing_info - get pairing information of a wunit | |
426 | * @mtd: pointer to new MTD device info structure | |
427 | * @wunit: write unit we are interested in | |
428 | * @info: returned pairing information | |
429 | * | |
430 | * Retrieve pairing information associated to the wunit. | |
431 | * This is mainly useful when dealing with MLC/TLC NANDs where pages can be | |
432 | * paired together, and where programming a page may influence the page it is | |
433 | * paired with. | |
434 | * The notion of page is replaced by the term wunit (write-unit) to stay | |
435 | * consistent with the ->writesize field. | |
436 | * | |
437 | * The @wunit argument can be extracted from an absolute offset using | |
438 | * mtd_offset_to_wunit(). @info is filled with the pairing information attached | |
439 | * to @wunit. | |
440 | * | |
441 | * From the pairing info the MTD user can find all the wunits paired with | |
442 | * @wunit using the following loop: | |
443 | * | |
444 | * for (i = 0; i < mtd_pairing_groups(mtd); i++) { | |
445 | * info.pair = i; | |
446 | * mtd_pairing_info_to_wunit(mtd, &info); | |
447 | * ... | |
448 | * } | |
449 | */ | |
450 | int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit, | |
451 | struct mtd_pairing_info *info) | |
452 | { | |
46b5889c MR |
453 | struct mtd_info *master = mtd_get_master(mtd); |
454 | int npairs = mtd_wunit_per_eb(master) / mtd_pairing_groups(master); | |
477b0229 BB |
455 | |
456 | if (wunit < 0 || wunit >= npairs) | |
457 | return -EINVAL; | |
458 | ||
46b5889c MR |
459 | if (master->pairing && master->pairing->get_info) |
460 | return master->pairing->get_info(master, wunit, info); | |
477b0229 BB |
461 | |
462 | info->group = 0; | |
463 | info->pair = wunit; | |
464 | ||
465 | return 0; | |
466 | } | |
467 | EXPORT_SYMBOL_GPL(mtd_wunit_to_pairing_info); | |
468 | ||
469 | /** | |
c77a9312 | 470 | * mtd_pairing_info_to_wunit - get wunit from pairing information |
477b0229 BB |
471 | * @mtd: pointer to new MTD device info structure |
472 | * @info: pairing information struct | |
473 | * | |
474 | * Returns a positive number representing the wunit associated to the info | |
475 | * struct, or a negative error code. | |
476 | * | |
477 | * This is the reverse of mtd_wunit_to_pairing_info(), and can help one to | |
478 | * iterate over all wunits of a given pair (see mtd_wunit_to_pairing_info() | |
479 | * doc). | |
480 | * | |
481 | * It can also be used to only program the first page of each pair (i.e. | |
482 | * page attached to group 0), which allows one to use an MLC NAND in | |
483 | * software-emulated SLC mode: | |
484 | * | |
485 | * info.group = 0; | |
486 | * npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd); | |
487 | * for (info.pair = 0; info.pair < npairs; info.pair++) { | |
488 | * wunit = mtd_pairing_info_to_wunit(mtd, &info); | |
489 | * mtd_write(mtd, mtd_wunit_to_offset(mtd, blkoffs, wunit), | |
490 | * mtd->writesize, &retlen, buf + (i * mtd->writesize)); | |
491 | * } | |
492 | */ | |
493 | int mtd_pairing_info_to_wunit(struct mtd_info *mtd, | |
494 | const struct mtd_pairing_info *info) | |
495 | { | |
46b5889c MR |
496 | struct mtd_info *master = mtd_get_master(mtd); |
497 | int ngroups = mtd_pairing_groups(master); | |
498 | int npairs = mtd_wunit_per_eb(master) / ngroups; | |
477b0229 BB |
499 | |
500 | if (!info || info->pair < 0 || info->pair >= npairs || | |
501 | info->group < 0 || info->group >= ngroups) | |
502 | return -EINVAL; | |
503 | ||
46b5889c MR |
504 | if (master->pairing && master->pairing->get_wunit) |
505 | return mtd->pairing->get_wunit(master, info); | |
477b0229 BB |
506 | |
507 | return info->pair; | |
508 | } | |
509 | EXPORT_SYMBOL_GPL(mtd_pairing_info_to_wunit); | |
510 | ||
511 | /** | |
512 | * mtd_pairing_groups - get the number of pairing groups | |
513 | * @mtd: pointer to new MTD device info structure | |
514 | * | |
515 | * Returns the number of pairing groups. | |
516 | * | |
517 | * This number is usually equal to the number of bits exposed by a single | |
518 | * cell, and can be used in conjunction with mtd_pairing_info_to_wunit() | |
519 | * to iterate over all pages of a given pair. | |
520 | */ | |
521 | int mtd_pairing_groups(struct mtd_info *mtd) | |
522 | { | |
46b5889c MR |
523 | struct mtd_info *master = mtd_get_master(mtd); |
524 | ||
525 | if (!master->pairing || !master->pairing->ngroups) | |
477b0229 BB |
526 | return 1; |
527 | ||
46b5889c | 528 | return master->pairing->ngroups; |
477b0229 BB |
529 | } |
530 | EXPORT_SYMBOL_GPL(mtd_pairing_groups); | |
531 | ||
c4dfa25a AB |
532 | static int mtd_nvmem_reg_read(void *priv, unsigned int offset, |
533 | void *val, size_t bytes) | |
534 | { | |
535 | struct mtd_info *mtd = priv; | |
536 | size_t retlen; | |
537 | int err; | |
538 | ||
539 | err = mtd_read(mtd, offset, bytes, &retlen, val); | |
540 | if (err && err != -EUCLEAN) | |
541 | return err; | |
542 | ||
543 | return retlen == bytes ? 0 : -EIO; | |
544 | } | |
545 | ||
546 | static int mtd_nvmem_add(struct mtd_info *mtd) | |
547 | { | |
658c4448 | 548 | struct device_node *node = mtd_get_of_node(mtd); |
c4dfa25a AB |
549 | struct nvmem_config config = {}; |
550 | ||
75f32f4b | 551 | config.id = NVMEM_DEVID_NONE; |
c4dfa25a | 552 | config.dev = &mtd->dev; |
7b01b723 | 553 | config.name = dev_name(&mtd->dev); |
c4dfa25a AB |
554 | config.owner = THIS_MODULE; |
555 | config.reg_read = mtd_nvmem_reg_read; | |
556 | config.size = mtd->size; | |
557 | config.word_size = 1; | |
558 | config.stride = 1; | |
559 | config.read_only = true; | |
560 | config.root_only = true; | |
6c762189 | 561 | config.ignore_wp = true; |
658c4448 | 562 | config.no_of_node = !of_device_is_compatible(node, "nvmem-cells"); |
c4dfa25a AB |
563 | config.priv = mtd; |
564 | ||
565 | mtd->nvmem = nvmem_register(&config); | |
566 | if (IS_ERR(mtd->nvmem)) { | |
567 | /* Just ignore if there is no NVMEM support in the kernel */ | |
5cab0615 | 568 | if (PTR_ERR(mtd->nvmem) == -EOPNOTSUPP) |
c4dfa25a | 569 | mtd->nvmem = NULL; |
5cab0615 MR |
570 | else |
571 | return dev_err_probe(&mtd->dev, PTR_ERR(mtd->nvmem), | |
572 | "Failed to register NVMEM device\n"); | |
c4dfa25a AB |
573 | } |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
ad9b10d1 CM |
578 | static void mtd_check_of_node(struct mtd_info *mtd) |
579 | { | |
580 | struct device_node *partitions, *parent_dn, *mtd_dn = NULL; | |
581 | const char *pname, *prefix = "partition-"; | |
582 | int plen, mtd_name_len, offset, prefix_len; | |
ad9b10d1 CM |
583 | |
584 | /* Check if MTD already has a device node */ | |
c5f5d0cd | 585 | if (mtd_get_of_node(mtd)) |
ad9b10d1 CM |
586 | return; |
587 | ||
7ec4cdb3 TH |
588 | if (!mtd_is_partition(mtd)) |
589 | return; | |
c5f5d0cd RM |
590 | |
591 | parent_dn = of_node_get(mtd_get_of_node(mtd->parent)); | |
ad9b10d1 CM |
592 | if (!parent_dn) |
593 | return; | |
594 | ||
2df11f00 RM |
595 | if (mtd_is_partition(mtd->parent)) |
596 | partitions = of_node_get(parent_dn); | |
597 | else | |
598 | partitions = of_get_child_by_name(parent_dn, "partitions"); | |
ad9b10d1 CM |
599 | if (!partitions) |
600 | goto exit_parent; | |
601 | ||
602 | prefix_len = strlen(prefix); | |
603 | mtd_name_len = strlen(mtd->name); | |
604 | ||
605 | /* Search if a partition is defined with the same name */ | |
606 | for_each_child_of_node(partitions, mtd_dn) { | |
ad9b10d1 | 607 | /* Skip partition with no/wrong prefix */ |
c5f5d0cd | 608 | if (!of_node_name_prefix(mtd_dn, prefix)) |
ad9b10d1 CM |
609 | continue; |
610 | ||
611 | /* Label have priority. Check that first */ | |
c5f5d0cd RM |
612 | if (!of_property_read_string(mtd_dn, "label", &pname)) { |
613 | offset = 0; | |
614 | } else { | |
615 | pname = mtd_dn->name; | |
ad9b10d1 CM |
616 | offset = prefix_len; |
617 | } | |
618 | ||
619 | plen = strlen(pname) - offset; | |
620 | if (plen == mtd_name_len && | |
621 | !strncmp(mtd->name, pname + offset, plen)) { | |
2df11f00 | 622 | mtd_set_of_node(mtd, mtd_dn); |
ad9b10d1 CM |
623 | break; |
624 | } | |
625 | } | |
626 | ||
ad9b10d1 CM |
627 | of_node_put(partitions); |
628 | exit_parent: | |
629 | of_node_put(parent_dn); | |
630 | } | |
631 | ||
1da177e4 LT |
632 | /** |
633 | * add_mtd_device - register an MTD device | |
634 | * @mtd: pointer to new MTD device info structure | |
635 | * | |
636 | * Add a device to the list of MTD devices present in the system, and | |
637 | * notify each currently active MTD 'user' of its arrival. Returns | |
57dd990c | 638 | * zero on success or non-zero on failure. |
1da177e4 LT |
639 | */ |
640 | ||
641 | int add_mtd_device(struct mtd_info *mtd) | |
642 | { | |
82e214f6 | 643 | struct device_node *np = mtd_get_of_node(mtd); |
46b5889c | 644 | struct mtd_info *master = mtd_get_master(mtd); |
b520e412 | 645 | struct mtd_notifier *not; |
82e214f6 | 646 | int i, error, ofidx; |
1da177e4 | 647 | |
be0dbff8 BN |
648 | /* |
649 | * May occur, for instance, on buggy drivers which call | |
650 | * mtd_device_parse_register() multiple times on the same master MTD, | |
651 | * especially with CONFIG_MTD_PARTITIONED_MASTER=y. | |
652 | */ | |
fa06052d | 653 | if (WARN_ONCE(mtd->dev.type, "MTD already registered\n")) |
be0dbff8 BN |
654 | return -EEXIST; |
655 | ||
783ed81f | 656 | BUG_ON(mtd->writesize == 0); |
33f45c44 | 657 | |
2431c4f5 BB |
658 | /* |
659 | * MTD drivers should implement ->_{write,read}() or | |
660 | * ->_{write,read}_oob(), but not both. | |
661 | */ | |
662 | if (WARN_ON((mtd->_write && mtd->_write_oob) || | |
663 | (mtd->_read && mtd->_read_oob))) | |
664 | return -EINVAL; | |
665 | ||
46b5889c | 666 | if (WARN_ON((!mtd->erasesize || !master->_erase) && |
33f45c44 BB |
667 | !(mtd->flags & MTD_NO_ERASE))) |
668 | return -EINVAL; | |
669 | ||
9e3307a1 BB |
670 | /* |
671 | * MTD_SLC_ON_MLC_EMULATION can only be set on partitions, when the | |
672 | * master is an MLC NAND and has a proper pairing scheme defined. | |
673 | * We also reject masters that implement ->_writev() for now, because | |
674 | * NAND controller drivers don't implement this hook, and adding the | |
675 | * SLC -> MLC address/length conversion to this path is useless if we | |
676 | * don't have a user. | |
677 | */ | |
678 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION && | |
679 | (!mtd_is_partition(mtd) || master->type != MTD_MLCNANDFLASH || | |
680 | !master->pairing || master->_writev)) | |
681 | return -EINVAL; | |
682 | ||
48b19268 | 683 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 684 | |
82e214f6 VW |
685 | ofidx = -1; |
686 | if (np) | |
687 | ofidx = of_alias_get_id(np, "mtd"); | |
688 | if (ofidx >= 0) | |
689 | i = idr_alloc(&mtd_idr, mtd, ofidx, ofidx + 1, GFP_KERNEL); | |
690 | else | |
691 | i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); | |
57dd990c BN |
692 | if (i < 0) { |
693 | error = i; | |
b520e412 | 694 | goto fail_locked; |
57dd990c | 695 | } |
1f24b5a8 | 696 | |
b520e412 | 697 | mtd->index = i; |
19bfa9eb | 698 | kref_init(&mtd->refcnt); |
b520e412 | 699 | |
d062d4ed MD |
700 | /* default value if not set by driver */ |
701 | if (mtd->bitflip_threshold == 0) | |
702 | mtd->bitflip_threshold = mtd->ecc_strength; | |
703 | ||
9e3307a1 BB |
704 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) { |
705 | int ngroups = mtd_pairing_groups(master); | |
706 | ||
707 | mtd->erasesize /= ngroups; | |
708 | mtd->size = (u64)mtd_div_by_eb(mtd->size, master) * | |
709 | mtd->erasesize; | |
710 | } | |
711 | ||
b520e412 BH |
712 | if (is_power_of_2(mtd->erasesize)) |
713 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; | |
714 | else | |
715 | mtd->erasesize_shift = 0; | |
716 | ||
717 | if (is_power_of_2(mtd->writesize)) | |
718 | mtd->writesize_shift = ffs(mtd->writesize) - 1; | |
719 | else | |
720 | mtd->writesize_shift = 0; | |
721 | ||
722 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; | |
723 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; | |
724 | ||
725 | /* Some chips always power up locked. Unlock them now */ | |
38134565 AB |
726 | if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { |
727 | error = mtd_unlock(mtd, 0, mtd->size); | |
728 | if (error && error != -EOPNOTSUPP) | |
b520e412 BH |
729 | printk(KERN_WARNING |
730 | "%s: unlock failed, writes may not work\n", | |
731 | mtd->name); | |
57dd990c BN |
732 | /* Ignore unlock failures? */ |
733 | error = 0; | |
b520e412 BH |
734 | } |
735 | ||
736 | /* Caller should have set dev.parent to match the | |
260e89a6 | 737 | * physical device, if appropriate. |
b520e412 BH |
738 | */ |
739 | mtd->dev.type = &mtd_devtype; | |
740 | mtd->dev.class = &mtd_class; | |
741 | mtd->dev.devt = MTD_DEVT(i); | |
742 | dev_set_name(&mtd->dev, "mtd%d", i); | |
743 | dev_set_drvdata(&mtd->dev, mtd); | |
ad9b10d1 | 744 | mtd_check_of_node(mtd); |
215a02fd | 745 | of_node_get(mtd_get_of_node(mtd)); |
57dd990c | 746 | error = device_register(&mtd->dev); |
895d68a3 ZX |
747 | if (error) { |
748 | put_device(&mtd->dev); | |
b520e412 | 749 | goto fail_added; |
895d68a3 | 750 | } |
b520e412 | 751 | |
c4dfa25a AB |
752 | /* Add the nvmem provider */ |
753 | error = mtd_nvmem_add(mtd); | |
754 | if (error) | |
755 | goto fail_nvmem_add; | |
756 | ||
1018c94b | 757 | mtd_debugfs_populate(mtd); |
e8e3edb9 | 758 | |
5e472128 BN |
759 | device_create(&mtd_class, mtd->dev.parent, MTD_DEVT(i) + 1, NULL, |
760 | "mtd%dro", i); | |
b520e412 | 761 | |
289c0522 | 762 | pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); |
b520e412 BH |
763 | /* No need to get a refcount on the module containing |
764 | the notifier, since we hold the mtd_table_mutex */ | |
765 | list_for_each_entry(not, &mtd_notifiers, list) | |
766 | not->add(mtd); | |
767 | ||
768 | mutex_unlock(&mtd_table_mutex); | |
26422ac7 | 769 | |
57150c40 | 770 | if (of_property_read_bool(mtd_get_of_node(mtd), "linux,rootfs")) { |
26422ac7 RM |
771 | if (IS_BUILTIN(CONFIG_MTD)) { |
772 | pr_info("mtd: setting mtd%d (%s) as root device\n", mtd->index, mtd->name); | |
773 | ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, mtd->index); | |
774 | } else { | |
775 | pr_warn("mtd: can't set mtd%d (%s) as root device - mtd must be builtin\n", | |
776 | mtd->index, mtd->name); | |
777 | } | |
778 | } | |
779 | ||
b520e412 BH |
780 | /* We _know_ we aren't being removed, because |
781 | our caller is still holding us here. So none | |
782 | of this try_ nonsense, and no bitching about it | |
783 | either. :) */ | |
784 | __module_get(THIS_MODULE); | |
785 | return 0; | |
97894cda | 786 | |
c4dfa25a AB |
787 | fail_nvmem_add: |
788 | device_unregister(&mtd->dev); | |
b520e412 | 789 | fail_added: |
215a02fd | 790 | of_node_put(mtd_get_of_node(mtd)); |
b520e412 BH |
791 | idr_remove(&mtd_idr, i); |
792 | fail_locked: | |
48b19268 | 793 | mutex_unlock(&mtd_table_mutex); |
57dd990c | 794 | return error; |
1da177e4 LT |
795 | } |
796 | ||
797 | /** | |
798 | * del_mtd_device - unregister an MTD device | |
799 | * @mtd: pointer to MTD device info structure | |
800 | * | |
801 | * Remove a device from the list of MTD devices present in the system, | |
802 | * and notify each currently active MTD 'user' of its departure. | |
803 | * Returns zero on success or 1 on failure, which currently will happen | |
804 | * if the requested device does not appear to be present in the list. | |
805 | */ | |
806 | ||
eea72d5f | 807 | int del_mtd_device(struct mtd_info *mtd) |
1da177e4 LT |
808 | { |
809 | int ret; | |
75c0b84d | 810 | struct mtd_notifier *not; |
97894cda | 811 | |
48b19268 | 812 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 813 | |
b520e412 | 814 | if (idr_find(&mtd_idr, mtd->index) != mtd) { |
1da177e4 | 815 | ret = -ENODEV; |
75c0b84d ML |
816 | goto out_error; |
817 | } | |
818 | ||
819 | /* No need to get a refcount on the module containing | |
820 | the notifier, since we hold the mtd_table_mutex */ | |
821 | list_for_each_entry(not, &mtd_notifiers, list) | |
822 | not->remove(mtd); | |
823 | ||
19bfa9eb TW |
824 | kref_put(&mtd->refcnt, mtd_device_release); |
825 | ret = 0; | |
1da177e4 | 826 | |
75c0b84d | 827 | out_error: |
48b19268 | 828 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
829 | return ret; |
830 | } | |
831 | ||
472b444e BN |
832 | /* |
833 | * Set a few defaults based on the parent devices, if not provided by the | |
834 | * driver | |
835 | */ | |
836 | static void mtd_set_dev_defaults(struct mtd_info *mtd) | |
837 | { | |
838 | if (mtd->dev.parent) { | |
839 | if (!mtd->owner && mtd->dev.parent->driver) | |
840 | mtd->owner = mtd->dev.parent->driver->owner; | |
841 | if (!mtd->name) | |
842 | mtd->name = dev_name(mtd->dev.parent); | |
843 | } else { | |
844 | pr_debug("mtd device won't show a device symlink in sysfs\n"); | |
845 | } | |
1186af45 | 846 | |
46b5889c MR |
847 | INIT_LIST_HEAD(&mtd->partitions); |
848 | mutex_init(&mtd->master.partitions_lock); | |
1ad55288 | 849 | mutex_init(&mtd->master.chrdev_lock); |
472b444e | 850 | } |
727dc612 | 851 | |
4b361cfa MW |
852 | static ssize_t mtd_otp_size(struct mtd_info *mtd, bool is_user) |
853 | { | |
c3c8c051 | 854 | struct otp_info *info; |
4b361cfa MW |
855 | ssize_t size = 0; |
856 | unsigned int i; | |
857 | size_t retlen; | |
858 | int ret; | |
859 | ||
c3c8c051 DC |
860 | info = kmalloc(PAGE_SIZE, GFP_KERNEL); |
861 | if (!info) | |
862 | return -ENOMEM; | |
863 | ||
4b361cfa MW |
864 | if (is_user) |
865 | ret = mtd_get_user_prot_info(mtd, PAGE_SIZE, &retlen, info); | |
866 | else | |
867 | ret = mtd_get_fact_prot_info(mtd, PAGE_SIZE, &retlen, info); | |
868 | if (ret) | |
869 | goto err; | |
870 | ||
bc8e157f JH |
871 | for (i = 0; i < retlen / sizeof(*info); i++) |
872 | size += info[i].length; | |
4b361cfa MW |
873 | |
874 | kfree(info); | |
875 | return size; | |
876 | ||
877 | err: | |
878 | kfree(info); | |
45bb1faa MW |
879 | |
880 | /* ENODATA means there is no OTP region. */ | |
881 | return ret == -ENODATA ? 0 : ret; | |
4b361cfa MW |
882 | } |
883 | ||
884 | static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd, | |
885 | const char *compatible, | |
886 | int size, | |
887 | nvmem_reg_read_t reg_read) | |
888 | { | |
889 | struct nvmem_device *nvmem = NULL; | |
890 | struct nvmem_config config = {}; | |
891 | struct device_node *np; | |
892 | ||
893 | /* DT binding is optional */ | |
894 | np = of_get_compatible_child(mtd->dev.of_node, compatible); | |
895 | ||
896 | /* OTP nvmem will be registered on the physical device */ | |
897 | config.dev = mtd->dev.parent; | |
1cd9ceaa MW |
898 | config.name = compatible; |
899 | config.id = NVMEM_DEVID_AUTO; | |
4b361cfa MW |
900 | config.owner = THIS_MODULE; |
901 | config.type = NVMEM_TYPE_OTP; | |
902 | config.root_only = true; | |
6c762189 | 903 | config.ignore_wp = true; |
4b361cfa MW |
904 | config.reg_read = reg_read; |
905 | config.size = size; | |
906 | config.of_node = np; | |
907 | config.priv = mtd; | |
908 | ||
909 | nvmem = nvmem_register(&config); | |
910 | /* Just ignore if there is no NVMEM support in the kernel */ | |
911 | if (IS_ERR(nvmem) && PTR_ERR(nvmem) == -EOPNOTSUPP) | |
912 | nvmem = NULL; | |
913 | ||
914 | of_node_put(np); | |
915 | ||
916 | return nvmem; | |
917 | } | |
918 | ||
919 | static int mtd_nvmem_user_otp_reg_read(void *priv, unsigned int offset, | |
920 | void *val, size_t bytes) | |
921 | { | |
922 | struct mtd_info *mtd = priv; | |
923 | size_t retlen; | |
924 | int ret; | |
925 | ||
926 | ret = mtd_read_user_prot_reg(mtd, offset, bytes, &retlen, val); | |
927 | if (ret) | |
928 | return ret; | |
929 | ||
930 | return retlen == bytes ? 0 : -EIO; | |
931 | } | |
932 | ||
933 | static int mtd_nvmem_fact_otp_reg_read(void *priv, unsigned int offset, | |
934 | void *val, size_t bytes) | |
935 | { | |
936 | struct mtd_info *mtd = priv; | |
937 | size_t retlen; | |
938 | int ret; | |
939 | ||
940 | ret = mtd_read_fact_prot_reg(mtd, offset, bytes, &retlen, val); | |
941 | if (ret) | |
942 | return ret; | |
943 | ||
944 | return retlen == bytes ? 0 : -EIO; | |
945 | } | |
946 | ||
947 | static int mtd_otp_nvmem_add(struct mtd_info *mtd) | |
948 | { | |
8bd1d24e | 949 | struct device *dev = mtd->dev.parent; |
4b361cfa MW |
950 | struct nvmem_device *nvmem; |
951 | ssize_t size; | |
952 | int err; | |
953 | ||
954 | if (mtd->_get_user_prot_info && mtd->_read_user_prot_reg) { | |
955 | size = mtd_otp_size(mtd, true); | |
956 | if (size < 0) | |
957 | return size; | |
958 | ||
959 | if (size > 0) { | |
960 | nvmem = mtd_otp_nvmem_register(mtd, "user-otp", size, | |
961 | mtd_nvmem_user_otp_reg_read); | |
962 | if (IS_ERR(nvmem)) { | |
281f7a6c MW |
963 | err = PTR_ERR(nvmem); |
964 | goto err; | |
4b361cfa MW |
965 | } |
966 | mtd->otp_user_nvmem = nvmem; | |
967 | } | |
968 | } | |
969 | ||
970 | if (mtd->_get_fact_prot_info && mtd->_read_fact_prot_reg) { | |
971 | size = mtd_otp_size(mtd, false); | |
972 | if (size < 0) { | |
973 | err = size; | |
974 | goto err; | |
975 | } | |
976 | ||
977 | if (size > 0) { | |
3b270fac LW |
978 | /* |
979 | * The factory OTP contains thing such as a unique serial | |
980 | * number and is small, so let's read it out and put it | |
981 | * into the entropy pool. | |
982 | */ | |
983 | void *otp; | |
984 | ||
985 | otp = kmalloc(size, GFP_KERNEL); | |
cefa1aaa DC |
986 | if (!otp) { |
987 | err = -ENOMEM; | |
988 | goto err; | |
989 | } | |
3b270fac LW |
990 | err = mtd_nvmem_fact_otp_reg_read(mtd, 0, otp, size); |
991 | if (err < 0) { | |
992 | kfree(otp); | |
cefa1aaa | 993 | goto err; |
3b270fac LW |
994 | } |
995 | add_device_randomness(otp, err); | |
996 | kfree(otp); | |
997 | ||
4b361cfa MW |
998 | nvmem = mtd_otp_nvmem_register(mtd, "factory-otp", size, |
999 | mtd_nvmem_fact_otp_reg_read); | |
1000 | if (IS_ERR(nvmem)) { | |
4b361cfa MW |
1001 | err = PTR_ERR(nvmem); |
1002 | goto err; | |
1003 | } | |
1004 | mtd->otp_factory_nvmem = nvmem; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | return 0; | |
1009 | ||
1010 | err: | |
bcf4ef28 | 1011 | nvmem_unregister(mtd->otp_user_nvmem); |
281f7a6c | 1012 | return dev_err_probe(dev, err, "Failed to register OTP NVMEM device\n"); |
4b361cfa MW |
1013 | } |
1014 | ||
1c4c215c DES |
1015 | /** |
1016 | * mtd_device_parse_register - parse partitions and register an MTD device. | |
1017 | * | |
1018 | * @mtd: the MTD device to register | |
1019 | * @types: the list of MTD partition probes to try, see | |
1020 | * 'parse_mtd_partitions()' for more information | |
c7975330 | 1021 | * @parser_data: MTD partition parser-specific data |
1c4c215c DES |
1022 | * @parts: fallback partition information to register, if parsing fails; |
1023 | * only valid if %nr_parts > %0 | |
1024 | * @nr_parts: the number of partitions in parts, if zero then the full | |
1025 | * MTD device is registered if no partition info is found | |
1026 | * | |
1027 | * This function aggregates MTD partitions parsing (done by | |
1028 | * 'parse_mtd_partitions()') and MTD device and partitions registering. It | |
1029 | * basically follows the most common pattern found in many MTD drivers: | |
1030 | * | |
55a999a0 RM |
1031 | * * If the MTD_PARTITIONED_MASTER option is set, then the device as a whole is |
1032 | * registered first. | |
1033 | * * Then It tries to probe partitions on MTD device @mtd using parsers | |
1c4c215c DES |
1034 | * specified in @types (if @types is %NULL, then the default list of parsers |
1035 | * is used, see 'parse_mtd_partitions()' for more information). If none are | |
1036 | * found this functions tries to fallback to information specified in | |
1037 | * @parts/@nr_parts. | |
1c4c215c DES |
1038 | * * If no partitions were found this function just registers the MTD device |
1039 | * @mtd and exits. | |
1040 | * | |
1041 | * Returns zero in case of success and a negative error code in case of failure. | |
1042 | */ | |
26a47346 | 1043 | int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types, |
c7975330 | 1044 | struct mtd_part_parser_data *parser_data, |
1c4c215c DES |
1045 | const struct mtd_partition *parts, |
1046 | int nr_parts) | |
1047 | { | |
727dc612 | 1048 | int ret; |
1c4c215c | 1049 | |
472b444e BN |
1050 | mtd_set_dev_defaults(mtd); |
1051 | ||
e0489f6e MW |
1052 | ret = mtd_otp_nvmem_add(mtd); |
1053 | if (ret) | |
1054 | goto out; | |
1055 | ||
2c77c57d RM |
1056 | if (IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) { |
1057 | ret = add_mtd_device(mtd); | |
1058 | if (ret) | |
e0489f6e | 1059 | goto out; |
2c77c57d RM |
1060 | } |
1061 | ||
0dbe4ea7 | 1062 | /* Prefer parsed partitions over driver-provided fallback */ |
5ac67ce3 | 1063 | ret = parse_mtd_partitions(mtd, types, parser_data); |
08608adb MS |
1064 | if (ret == -EPROBE_DEFER) |
1065 | goto out; | |
1066 | ||
5ac67ce3 RM |
1067 | if (ret > 0) |
1068 | ret = 0; | |
1069 | else if (nr_parts) | |
0dbe4ea7 RM |
1070 | ret = add_mtd_partitions(mtd, parts, nr_parts); |
1071 | else if (!device_is_registered(&mtd->dev)) | |
1072 | ret = add_mtd_device(mtd); | |
1073 | else | |
1074 | ret = 0; | |
1075 | ||
3e00ed0e BN |
1076 | if (ret) |
1077 | goto out; | |
1c4c215c | 1078 | |
e1dd8641 NC |
1079 | /* |
1080 | * FIXME: some drivers unfortunately call this function more than once. | |
1081 | * So we have to check if we've already assigned the reboot notifier. | |
1082 | * | |
1083 | * Generally, we can make multiple calls work for most cases, but it | |
1084 | * does cause problems with parse_mtd_partitions() above (e.g., | |
1085 | * cmdlineparts will register partitions more than once). | |
1086 | */ | |
f8479dd6 BN |
1087 | WARN_ONCE(mtd->_reboot && mtd->reboot_notifier.notifier_call, |
1088 | "MTD already registered\n"); | |
e1dd8641 | 1089 | if (mtd->_reboot && !mtd->reboot_notifier.notifier_call) { |
3efe41be BN |
1090 | mtd->reboot_notifier.notifier_call = mtd_reboot_notifier; |
1091 | register_reboot_notifier(&mtd->reboot_notifier); | |
1092 | } | |
1093 | ||
3e00ed0e | 1094 | out: |
e0489f6e MW |
1095 | if (ret) { |
1096 | nvmem_unregister(mtd->otp_user_nvmem); | |
1097 | nvmem_unregister(mtd->otp_factory_nvmem); | |
1098 | } | |
1099 | ||
2c77c57d RM |
1100 | if (ret && device_is_registered(&mtd->dev)) |
1101 | del_mtd_device(mtd); | |
1102 | ||
727dc612 | 1103 | return ret; |
1c4c215c DES |
1104 | } |
1105 | EXPORT_SYMBOL_GPL(mtd_device_parse_register); | |
1106 | ||
f5671ab3 JI |
1107 | /** |
1108 | * mtd_device_unregister - unregister an existing MTD device. | |
1109 | * | |
1110 | * @master: the MTD device to unregister. This will unregister both the master | |
1111 | * and any partitions if registered. | |
1112 | */ | |
1113 | int mtd_device_unregister(struct mtd_info *master) | |
1114 | { | |
1115 | int err; | |
1116 | ||
00596576 | 1117 | if (master->_reboot) { |
3efe41be | 1118 | unregister_reboot_notifier(&master->reboot_notifier); |
00596576 ZW |
1119 | memset(&master->reboot_notifier, 0, sizeof(master->reboot_notifier)); |
1120 | } | |
3efe41be | 1121 | |
bcf4ef28 AS |
1122 | nvmem_unregister(master->otp_user_nvmem); |
1123 | nvmem_unregister(master->otp_factory_nvmem); | |
4b361cfa | 1124 | |
f5671ab3 JI |
1125 | err = del_mtd_partitions(master); |
1126 | if (err) | |
1127 | return err; | |
1128 | ||
1129 | if (!device_is_registered(&master->dev)) | |
1130 | return 0; | |
1131 | ||
1132 | return del_mtd_device(master); | |
1133 | } | |
1134 | EXPORT_SYMBOL_GPL(mtd_device_unregister); | |
1135 | ||
1da177e4 LT |
1136 | /** |
1137 | * register_mtd_user - register a 'user' of MTD devices. | |
1138 | * @new: pointer to notifier info structure | |
1139 | * | |
1140 | * Registers a pair of callbacks function to be called upon addition | |
1141 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
1142 | * invoked for each MTD device currently present in the system. | |
1143 | */ | |
1da177e4 LT |
1144 | void register_mtd_user (struct mtd_notifier *new) |
1145 | { | |
f1332ba2 | 1146 | struct mtd_info *mtd; |
1da177e4 | 1147 | |
48b19268 | 1148 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
1149 | |
1150 | list_add(&new->list, &mtd_notifiers); | |
1151 | ||
d5ca5129 | 1152 | __module_get(THIS_MODULE); |
97894cda | 1153 | |
f1332ba2 BH |
1154 | mtd_for_each_device(mtd) |
1155 | new->add(mtd); | |
1da177e4 | 1156 | |
48b19268 | 1157 | mutex_unlock(&mtd_table_mutex); |
1da177e4 | 1158 | } |
33c87b4a | 1159 | EXPORT_SYMBOL_GPL(register_mtd_user); |
1da177e4 LT |
1160 | |
1161 | /** | |
49450795 AB |
1162 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
1163 | * @old: pointer to notifier info structure | |
1da177e4 LT |
1164 | * |
1165 | * Removes a callback function pair from the list of 'users' to be | |
1166 | * notified upon addition or removal of MTD devices. Causes the | |
1167 | * 'remove' callback to be immediately invoked for each MTD device | |
1168 | * currently present in the system. | |
1169 | */ | |
1da177e4 LT |
1170 | int unregister_mtd_user (struct mtd_notifier *old) |
1171 | { | |
f1332ba2 | 1172 | struct mtd_info *mtd; |
1da177e4 | 1173 | |
48b19268 | 1174 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
1175 | |
1176 | module_put(THIS_MODULE); | |
1177 | ||
f1332ba2 BH |
1178 | mtd_for_each_device(mtd) |
1179 | old->remove(mtd); | |
97894cda | 1180 | |
1da177e4 | 1181 | list_del(&old->list); |
48b19268 | 1182 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
1183 | return 0; |
1184 | } | |
33c87b4a | 1185 | EXPORT_SYMBOL_GPL(unregister_mtd_user); |
1da177e4 LT |
1186 | |
1187 | /** | |
1188 | * get_mtd_device - obtain a validated handle for an MTD device | |
1189 | * @mtd: last known address of the required MTD device | |
1190 | * @num: internal device number of the required MTD device | |
1191 | * | |
1192 | * Given a number and NULL address, return the num'th entry in the device | |
1193 | * table, if any. Given an address and num == -1, search the device table | |
1194 | * for a device with that address and return if it's still present. Given | |
9c74034f AB |
1195 | * both, return the num'th driver only if its address matches. Return |
1196 | * error code if not. | |
1da177e4 | 1197 | */ |
1da177e4 LT |
1198 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
1199 | { | |
f1332ba2 BH |
1200 | struct mtd_info *ret = NULL, *other; |
1201 | int err = -ENODEV; | |
1da177e4 | 1202 | |
48b19268 | 1203 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
1204 | |
1205 | if (num == -1) { | |
f1332ba2 BH |
1206 | mtd_for_each_device(other) { |
1207 | if (other == mtd) { | |
1208 | ret = mtd; | |
1209 | break; | |
1210 | } | |
1211 | } | |
b520e412 BH |
1212 | } else if (num >= 0) { |
1213 | ret = idr_find(&mtd_idr, num); | |
1da177e4 LT |
1214 | if (mtd && mtd != ret) |
1215 | ret = NULL; | |
1216 | } | |
1217 | ||
3bd45657 ML |
1218 | if (!ret) { |
1219 | ret = ERR_PTR(err); | |
1220 | goto out; | |
9fe912ce | 1221 | } |
1da177e4 | 1222 | |
3bd45657 ML |
1223 | err = __get_mtd_device(ret); |
1224 | if (err) | |
1225 | ret = ERR_PTR(err); | |
1226 | out: | |
9c74034f AB |
1227 | mutex_unlock(&mtd_table_mutex); |
1228 | return ret; | |
3bd45657 | 1229 | } |
33c87b4a | 1230 | EXPORT_SYMBOL_GPL(get_mtd_device); |
1da177e4 | 1231 | |
3bd45657 ML |
1232 | |
1233 | int __get_mtd_device(struct mtd_info *mtd) | |
1234 | { | |
46b5889c | 1235 | struct mtd_info *master = mtd_get_master(mtd); |
3bd45657 ML |
1236 | int err; |
1237 | ||
46b5889c MR |
1238 | if (master->_get_device) { |
1239 | err = master->_get_device(mtd); | |
79c4a562 | 1240 | if (err) |
3bd45657 | 1241 | return err; |
3bd45657 | 1242 | } |
46b5889c | 1243 | |
79c4a562 AU |
1244 | if (!try_module_get(master->owner)) { |
1245 | if (master->_put_device) | |
1246 | master->_put_device(master); | |
1247 | return -ENODEV; | |
1248 | } | |
1249 | ||
264725e3 MR |
1250 | while (mtd) { |
1251 | if (mtd != master) | |
1252 | kref_get(&mtd->refcnt); | |
46b5889c MR |
1253 | mtd = mtd->parent; |
1254 | } | |
1255 | ||
264725e3 MR |
1256 | if (IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) |
1257 | kref_get(&master->refcnt); | |
1258 | ||
3bd45657 | 1259 | return 0; |
1da177e4 | 1260 | } |
33c87b4a | 1261 | EXPORT_SYMBOL_GPL(__get_mtd_device); |
1da177e4 | 1262 | |
4a575865 RM |
1263 | /** |
1264 | * of_get_mtd_device_by_node - obtain an MTD device associated with a given node | |
1265 | * | |
1266 | * @np: device tree node | |
1267 | */ | |
1268 | struct mtd_info *of_get_mtd_device_by_node(struct device_node *np) | |
1269 | { | |
1270 | struct mtd_info *mtd = NULL; | |
1271 | struct mtd_info *tmp; | |
1272 | int err; | |
1273 | ||
1274 | mutex_lock(&mtd_table_mutex); | |
1275 | ||
1276 | err = -EPROBE_DEFER; | |
1277 | mtd_for_each_device(tmp) { | |
1278 | if (mtd_get_of_node(tmp) == np) { | |
1279 | mtd = tmp; | |
1280 | err = __get_mtd_device(mtd); | |
1281 | break; | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | mutex_unlock(&mtd_table_mutex); | |
1286 | ||
1287 | return err ? ERR_PTR(err) : mtd; | |
1288 | } | |
1289 | EXPORT_SYMBOL_GPL(of_get_mtd_device_by_node); | |
1290 | ||
7799308f AB |
1291 | /** |
1292 | * get_mtd_device_nm - obtain a validated handle for an MTD device by | |
1293 | * device name | |
1294 | * @name: MTD device name to open | |
1295 | * | |
1296 | * This function returns MTD device description structure in case of | |
1297 | * success and an error code in case of failure. | |
1298 | */ | |
7799308f AB |
1299 | struct mtd_info *get_mtd_device_nm(const char *name) |
1300 | { | |
f1332ba2 BH |
1301 | int err = -ENODEV; |
1302 | struct mtd_info *mtd = NULL, *other; | |
7799308f AB |
1303 | |
1304 | mutex_lock(&mtd_table_mutex); | |
1305 | ||
f1332ba2 BH |
1306 | mtd_for_each_device(other) { |
1307 | if (!strcmp(name, other->name)) { | |
1308 | mtd = other; | |
7799308f AB |
1309 | break; |
1310 | } | |
1311 | } | |
1312 | ||
9fe912ce | 1313 | if (!mtd) |
7799308f AB |
1314 | goto out_unlock; |
1315 | ||
52534f2d WG |
1316 | err = __get_mtd_device(mtd); |
1317 | if (err) | |
7799308f AB |
1318 | goto out_unlock; |
1319 | ||
9fe912ce AB |
1320 | mutex_unlock(&mtd_table_mutex); |
1321 | return mtd; | |
7799308f AB |
1322 | |
1323 | out_unlock: | |
1324 | mutex_unlock(&mtd_table_mutex); | |
9fe912ce | 1325 | return ERR_PTR(err); |
7799308f | 1326 | } |
33c87b4a | 1327 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); |
7799308f | 1328 | |
1da177e4 LT |
1329 | void put_mtd_device(struct mtd_info *mtd) |
1330 | { | |
48b19268 | 1331 | mutex_lock(&mtd_table_mutex); |
3bd45657 ML |
1332 | __put_mtd_device(mtd); |
1333 | mutex_unlock(&mtd_table_mutex); | |
1334 | ||
1335 | } | |
33c87b4a | 1336 | EXPORT_SYMBOL_GPL(put_mtd_device); |
3bd45657 ML |
1337 | |
1338 | void __put_mtd_device(struct mtd_info *mtd) | |
1339 | { | |
46b5889c | 1340 | struct mtd_info *master = mtd_get_master(mtd); |
3bd45657 | 1341 | |
264725e3 MR |
1342 | while (mtd) { |
1343 | /* kref_put() can relese mtd, so keep a reference mtd->parent */ | |
19bfa9eb | 1344 | struct mtd_info *parent = mtd->parent; |
46b5889c | 1345 | |
264725e3 MR |
1346 | if (mtd != master) |
1347 | kref_put(&mtd->refcnt, mtd_device_release); | |
19bfa9eb TW |
1348 | mtd = parent; |
1349 | } | |
1ca71415 | 1350 | |
79c4a562 AU |
1351 | if (IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) |
1352 | kref_put(&master->refcnt, mtd_device_release); | |
1da177e4 | 1353 | |
46b5889c | 1354 | module_put(master->owner); |
19bfa9eb | 1355 | |
79c4a562 AU |
1356 | /* must be the last as master can be freed in the _put_device */ |
1357 | if (master->_put_device) | |
1358 | master->_put_device(master); | |
1da177e4 | 1359 | } |
33c87b4a | 1360 | EXPORT_SYMBOL_GPL(__put_mtd_device); |
1da177e4 | 1361 | |
8273a0c9 | 1362 | /* |
884cfd90 BB |
1363 | * Erase is an synchronous operation. Device drivers are epected to return a |
1364 | * negative error code if the operation failed and update instr->fail_addr | |
1365 | * to point the portion that was not properly erased. | |
8273a0c9 AB |
1366 | */ |
1367 | int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) | |
1368 | { | |
46b5889c MR |
1369 | struct mtd_info *master = mtd_get_master(mtd); |
1370 | u64 mst_ofs = mtd_get_master_ofs(mtd, 0); | |
9e3307a1 | 1371 | struct erase_info adjinstr; |
46b5889c MR |
1372 | int ret; |
1373 | ||
c585da9f | 1374 | instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; |
9e3307a1 | 1375 | adjinstr = *instr; |
c585da9f | 1376 | |
46b5889c | 1377 | if (!mtd->erasesize || !master->_erase) |
e6e620f0 BB |
1378 | return -ENOTSUPP; |
1379 | ||
0c2b4e21 | 1380 | if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr) |
8273a0c9 | 1381 | return -EINVAL; |
664addc2 AB |
1382 | if (!(mtd->flags & MTD_WRITEABLE)) |
1383 | return -EROFS; | |
e6e620f0 | 1384 | |
e7bfb3fd | 1385 | if (!instr->len) |
bcb1d238 | 1386 | return 0; |
e7bfb3fd | 1387 | |
fea728c0 | 1388 | ledtrig_mtd_activity(); |
46b5889c | 1389 | |
9e3307a1 BB |
1390 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) { |
1391 | adjinstr.addr = (loff_t)mtd_div_by_eb(instr->addr, mtd) * | |
1392 | master->erasesize; | |
1393 | adjinstr.len = ((u64)mtd_div_by_eb(instr->addr + instr->len, mtd) * | |
1394 | master->erasesize) - | |
1395 | adjinstr.addr; | |
1396 | } | |
1397 | ||
1398 | adjinstr.addr += mst_ofs; | |
1399 | ||
1400 | ret = master->_erase(master, &adjinstr); | |
1401 | ||
1402 | if (adjinstr.fail_addr != MTD_FAIL_ADDR_UNKNOWN) { | |
1403 | instr->fail_addr = adjinstr.fail_addr - mst_ofs; | |
1404 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) { | |
1405 | instr->fail_addr = mtd_div_by_eb(instr->fail_addr, | |
1406 | master); | |
1407 | instr->fail_addr *= mtd->erasesize; | |
1408 | } | |
1409 | } | |
46b5889c | 1410 | |
46b5889c | 1411 | return ret; |
8273a0c9 AB |
1412 | } |
1413 | EXPORT_SYMBOL_GPL(mtd_erase); | |
1414 | ||
1415 | /* | |
1416 | * This stuff for eXecute-In-Place. phys is optional and may be set to NULL. | |
1417 | */ | |
1418 | int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
1419 | void **virt, resource_size_t *phys) | |
1420 | { | |
46b5889c MR |
1421 | struct mtd_info *master = mtd_get_master(mtd); |
1422 | ||
8273a0c9 | 1423 | *retlen = 0; |
0dd5235f AB |
1424 | *virt = NULL; |
1425 | if (phys) | |
1426 | *phys = 0; | |
46b5889c | 1427 | if (!master->_point) |
8273a0c9 | 1428 | return -EOPNOTSUPP; |
0c2b4e21 | 1429 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c9 | 1430 | return -EINVAL; |
bcb1d238 AB |
1431 | if (!len) |
1432 | return 0; | |
46b5889c MR |
1433 | |
1434 | from = mtd_get_master_ofs(mtd, from); | |
1435 | return master->_point(master, from, len, retlen, virt, phys); | |
8273a0c9 AB |
1436 | } |
1437 | EXPORT_SYMBOL_GPL(mtd_point); | |
1438 | ||
1439 | /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ | |
1440 | int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len) | |
1441 | { | |
46b5889c MR |
1442 | struct mtd_info *master = mtd_get_master(mtd); |
1443 | ||
1444 | if (!master->_unpoint) | |
8273a0c9 | 1445 | return -EOPNOTSUPP; |
0c2b4e21 | 1446 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c9 | 1447 | return -EINVAL; |
bcb1d238 AB |
1448 | if (!len) |
1449 | return 0; | |
46b5889c | 1450 | return master->_unpoint(master, mtd_get_master_ofs(mtd, from), len); |
8273a0c9 AB |
1451 | } |
1452 | EXPORT_SYMBOL_GPL(mtd_unpoint); | |
1453 | ||
1454 | /* | |
1455 | * Allow NOMMU mmap() to directly map the device (if not NULL) | |
1456 | * - return the address to which the offset maps | |
1457 | * - return -ENOSYS to indicate refusal to do the mapping | |
1458 | */ | |
1459 | unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, | |
1460 | unsigned long offset, unsigned long flags) | |
1461 | { | |
9eaa903c NP |
1462 | size_t retlen; |
1463 | void *virt; | |
1464 | int ret; | |
1465 | ||
1466 | ret = mtd_point(mtd, offset, len, &retlen, &virt, NULL); | |
1467 | if (ret) | |
1468 | return ret; | |
1469 | if (retlen != len) { | |
1470 | mtd_unpoint(mtd, offset, retlen); | |
1471 | return -ENOSYS; | |
1472 | } | |
1473 | return (unsigned long)virt; | |
8273a0c9 AB |
1474 | } |
1475 | EXPORT_SYMBOL_GPL(mtd_get_unmapped_area); | |
1476 | ||
46b5889c MR |
1477 | static void mtd_update_ecc_stats(struct mtd_info *mtd, struct mtd_info *master, |
1478 | const struct mtd_ecc_stats *old_stats) | |
1479 | { | |
1480 | struct mtd_ecc_stats diff; | |
1481 | ||
1482 | if (master == mtd) | |
1483 | return; | |
1484 | ||
1485 | diff = master->ecc_stats; | |
1486 | diff.failed -= old_stats->failed; | |
1487 | diff.corrected -= old_stats->corrected; | |
1488 | ||
1489 | while (mtd->parent) { | |
1490 | mtd->ecc_stats.failed += diff.failed; | |
1491 | mtd->ecc_stats.corrected += diff.corrected; | |
1492 | mtd = mtd->parent; | |
1493 | } | |
1494 | } | |
1495 | ||
8273a0c9 AB |
1496 | int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, |
1497 | u_char *buf) | |
1498 | { | |
2431c4f5 BB |
1499 | struct mtd_oob_ops ops = { |
1500 | .len = len, | |
1501 | .datbuf = buf, | |
1502 | }; | |
1503 | int ret; | |
edbc4540 | 1504 | |
2431c4f5 BB |
1505 | ret = mtd_read_oob(mtd, from, &ops); |
1506 | *retlen = ops.retlen; | |
24ff1292 | 1507 | |
2431c4f5 | 1508 | return ret; |
8273a0c9 AB |
1509 | } |
1510 | EXPORT_SYMBOL_GPL(mtd_read); | |
1511 | ||
1512 | int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
1513 | const u_char *buf) | |
1514 | { | |
2431c4f5 BB |
1515 | struct mtd_oob_ops ops = { |
1516 | .len = len, | |
1517 | .datbuf = (u8 *)buf, | |
1518 | }; | |
1519 | int ret; | |
24ff1292 | 1520 | |
2431c4f5 BB |
1521 | ret = mtd_write_oob(mtd, to, &ops); |
1522 | *retlen = ops.retlen; | |
24ff1292 | 1523 | |
2431c4f5 | 1524 | return ret; |
8273a0c9 AB |
1525 | } |
1526 | EXPORT_SYMBOL_GPL(mtd_write); | |
1527 | ||
1528 | /* | |
1529 | * In blackbox flight recorder like scenarios we want to make successful writes | |
1530 | * in interrupt context. panic_write() is only intended to be called when its | |
1531 | * known the kernel is about to panic and we need the write to succeed. Since | |
1532 | * the kernel is not going to be running for much longer, this function can | |
1533 | * break locks and delay to ensure the write succeeds (but not sleep). | |
1534 | */ | |
1535 | int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
1536 | const u_char *buf) | |
1537 | { | |
46b5889c MR |
1538 | struct mtd_info *master = mtd_get_master(mtd); |
1539 | ||
8273a0c9 | 1540 | *retlen = 0; |
46b5889c | 1541 | if (!master->_panic_write) |
8273a0c9 | 1542 | return -EOPNOTSUPP; |
0c2b4e21 | 1543 | if (to < 0 || to >= mtd->size || len > mtd->size - to) |
8273a0c9 | 1544 | return -EINVAL; |
664addc2 AB |
1545 | if (!(mtd->flags & MTD_WRITEABLE)) |
1546 | return -EROFS; | |
bcb1d238 AB |
1547 | if (!len) |
1548 | return 0; | |
630e8d55 KD |
1549 | if (!master->oops_panic_write) |
1550 | master->oops_panic_write = true; | |
9f897bfd | 1551 | |
46b5889c MR |
1552 | return master->_panic_write(master, mtd_get_master_ofs(mtd, to), len, |
1553 | retlen, buf); | |
8273a0c9 AB |
1554 | } |
1555 | EXPORT_SYMBOL_GPL(mtd_panic_write); | |
1556 | ||
5cdd929d BB |
1557 | static int mtd_check_oob_ops(struct mtd_info *mtd, loff_t offs, |
1558 | struct mtd_oob_ops *ops) | |
1559 | { | |
1560 | /* | |
1561 | * Some users are setting ->datbuf or ->oobbuf to NULL, but are leaving | |
1562 | * ->len or ->ooblen uninitialized. Force ->len and ->ooblen to 0 in | |
1563 | * this case. | |
1564 | */ | |
1565 | if (!ops->datbuf) | |
1566 | ops->len = 0; | |
1567 | ||
1568 | if (!ops->oobbuf) | |
1569 | ops->ooblen = 0; | |
1570 | ||
d82c3682 | 1571 | if (offs < 0 || offs + ops->len > mtd->size) |
5cdd929d BB |
1572 | return -EINVAL; |
1573 | ||
1574 | if (ops->ooblen) { | |
89f706db | 1575 | size_t maxooblen; |
5cdd929d BB |
1576 | |
1577 | if (ops->ooboffs >= mtd_oobavail(mtd, ops)) | |
1578 | return -EINVAL; | |
1579 | ||
89f706db MR |
1580 | maxooblen = ((size_t)(mtd_div_by_ws(mtd->size, mtd) - |
1581 | mtd_div_by_ws(offs, mtd)) * | |
5cdd929d BB |
1582 | mtd_oobavail(mtd, ops)) - ops->ooboffs; |
1583 | if (ops->ooblen > maxooblen) | |
1584 | return -EINVAL; | |
1585 | } | |
1586 | ||
1587 | return 0; | |
1588 | } | |
1589 | ||
9e3307a1 BB |
1590 | static int mtd_read_oob_std(struct mtd_info *mtd, loff_t from, |
1591 | struct mtd_oob_ops *ops) | |
1592 | { | |
1593 | struct mtd_info *master = mtd_get_master(mtd); | |
1594 | int ret; | |
1595 | ||
1596 | from = mtd_get_master_ofs(mtd, from); | |
1597 | if (master->_read_oob) | |
1598 | ret = master->_read_oob(master, from, ops); | |
1599 | else | |
1600 | ret = master->_read(master, from, ops->len, &ops->retlen, | |
1601 | ops->datbuf); | |
1602 | ||
1603 | return ret; | |
1604 | } | |
1605 | ||
1606 | static int mtd_write_oob_std(struct mtd_info *mtd, loff_t to, | |
1607 | struct mtd_oob_ops *ops) | |
1608 | { | |
1609 | struct mtd_info *master = mtd_get_master(mtd); | |
1610 | int ret; | |
1611 | ||
1612 | to = mtd_get_master_ofs(mtd, to); | |
1613 | if (master->_write_oob) | |
1614 | ret = master->_write_oob(master, to, ops); | |
1615 | else | |
1616 | ret = master->_write(master, to, ops->len, &ops->retlen, | |
1617 | ops->datbuf); | |
1618 | ||
1619 | return ret; | |
1620 | } | |
1621 | ||
1622 | static int mtd_io_emulated_slc(struct mtd_info *mtd, loff_t start, bool read, | |
1623 | struct mtd_oob_ops *ops) | |
1624 | { | |
1625 | struct mtd_info *master = mtd_get_master(mtd); | |
1626 | int ngroups = mtd_pairing_groups(master); | |
1627 | int npairs = mtd_wunit_per_eb(master) / ngroups; | |
1628 | struct mtd_oob_ops adjops = *ops; | |
1629 | unsigned int wunit, oobavail; | |
1630 | struct mtd_pairing_info info; | |
1631 | int max_bitflips = 0; | |
1632 | u32 ebofs, pageofs; | |
1633 | loff_t base, pos; | |
1634 | ||
1635 | ebofs = mtd_mod_by_eb(start, mtd); | |
1636 | base = (loff_t)mtd_div_by_eb(start, mtd) * master->erasesize; | |
1637 | info.group = 0; | |
1638 | info.pair = mtd_div_by_ws(ebofs, mtd); | |
1639 | pageofs = mtd_mod_by_ws(ebofs, mtd); | |
1640 | oobavail = mtd_oobavail(mtd, ops); | |
1641 | ||
1642 | while (ops->retlen < ops->len || ops->oobretlen < ops->ooblen) { | |
1643 | int ret; | |
1644 | ||
1645 | if (info.pair >= npairs) { | |
1646 | info.pair = 0; | |
1647 | base += master->erasesize; | |
1648 | } | |
1649 | ||
1650 | wunit = mtd_pairing_info_to_wunit(master, &info); | |
1651 | pos = mtd_wunit_to_offset(mtd, base, wunit); | |
1652 | ||
1653 | adjops.len = ops->len - ops->retlen; | |
1654 | if (adjops.len > mtd->writesize - pageofs) | |
1655 | adjops.len = mtd->writesize - pageofs; | |
1656 | ||
1657 | adjops.ooblen = ops->ooblen - ops->oobretlen; | |
1658 | if (adjops.ooblen > oobavail - adjops.ooboffs) | |
1659 | adjops.ooblen = oobavail - adjops.ooboffs; | |
1660 | ||
1661 | if (read) { | |
1662 | ret = mtd_read_oob_std(mtd, pos + pageofs, &adjops); | |
1663 | if (ret > 0) | |
1664 | max_bitflips = max(max_bitflips, ret); | |
1665 | } else { | |
1666 | ret = mtd_write_oob_std(mtd, pos + pageofs, &adjops); | |
1667 | } | |
1668 | ||
1669 | if (ret < 0) | |
1670 | return ret; | |
1671 | ||
1672 | max_bitflips = max(max_bitflips, ret); | |
1673 | ops->retlen += adjops.retlen; | |
1674 | ops->oobretlen += adjops.oobretlen; | |
1675 | adjops.datbuf += adjops.retlen; | |
1676 | adjops.oobbuf += adjops.oobretlen; | |
1677 | adjops.ooboffs = 0; | |
1678 | pageofs = 0; | |
1679 | info.pair++; | |
1680 | } | |
1681 | ||
1682 | return max_bitflips; | |
1683 | } | |
1684 | ||
d2d48480 BN |
1685 | int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) |
1686 | { | |
46b5889c MR |
1687 | struct mtd_info *master = mtd_get_master(mtd); |
1688 | struct mtd_ecc_stats old_stats = master->ecc_stats; | |
e47f6858 | 1689 | int ret_code; |
46b5889c | 1690 | |
d2d48480 | 1691 | ops->retlen = ops->oobretlen = 0; |
fea728c0 | 1692 | |
5cdd929d BB |
1693 | ret_code = mtd_check_oob_ops(mtd, from, ops); |
1694 | if (ret_code) | |
1695 | return ret_code; | |
1696 | ||
fea728c0 | 1697 | ledtrig_mtd_activity(); |
89fd23ef MR |
1698 | |
1699 | /* Check the validity of a potential fallback on mtd->_read */ | |
46b5889c | 1700 | if (!master->_read_oob && (!master->_read || ops->oobbuf)) |
89fd23ef MR |
1701 | return -EOPNOTSUPP; |
1702 | ||
65394169 MK |
1703 | if (ops->stats) |
1704 | memset(ops->stats, 0, sizeof(*ops->stats)); | |
1705 | ||
9e3307a1 BB |
1706 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) |
1707 | ret_code = mtd_io_emulated_slc(mtd, from, true, ops); | |
89fd23ef | 1708 | else |
9e3307a1 | 1709 | ret_code = mtd_read_oob_std(mtd, from, ops); |
46b5889c MR |
1710 | |
1711 | mtd_update_ecc_stats(mtd, master, &old_stats); | |
89fd23ef | 1712 | |
e47f6858 BN |
1713 | /* |
1714 | * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics | |
1715 | * similar to mtd->_read(), returning a non-negative integer | |
1716 | * representing max bitflips. In other cases, mtd->_read_oob() may | |
1717 | * return -EUCLEAN. In all cases, perform similar logic to mtd_read(). | |
1718 | */ | |
e47f6858 BN |
1719 | if (unlikely(ret_code < 0)) |
1720 | return ret_code; | |
1721 | if (mtd->ecc_strength == 0) | |
1722 | return 0; /* device lacks ecc */ | |
65394169 MK |
1723 | if (ops->stats) |
1724 | ops->stats->max_bitflips = ret_code; | |
e47f6858 | 1725 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; |
d2d48480 BN |
1726 | } |
1727 | EXPORT_SYMBOL_GPL(mtd_read_oob); | |
1728 | ||
0c034fe3 EG |
1729 | int mtd_write_oob(struct mtd_info *mtd, loff_t to, |
1730 | struct mtd_oob_ops *ops) | |
1731 | { | |
46b5889c | 1732 | struct mtd_info *master = mtd_get_master(mtd); |
5cdd929d BB |
1733 | int ret; |
1734 | ||
0c034fe3 | 1735 | ops->retlen = ops->oobretlen = 0; |
89fd23ef | 1736 | |
0c034fe3 EG |
1737 | if (!(mtd->flags & MTD_WRITEABLE)) |
1738 | return -EROFS; | |
5cdd929d BB |
1739 | |
1740 | ret = mtd_check_oob_ops(mtd, to, ops); | |
1741 | if (ret) | |
1742 | return ret; | |
1743 | ||
fea728c0 | 1744 | ledtrig_mtd_activity(); |
89fd23ef MR |
1745 | |
1746 | /* Check the validity of a potential fallback on mtd->_write */ | |
46b5889c | 1747 | if (!master->_write_oob && (!master->_write || ops->oobbuf)) |
89fd23ef MR |
1748 | return -EOPNOTSUPP; |
1749 | ||
9e3307a1 BB |
1750 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) |
1751 | return mtd_io_emulated_slc(mtd, to, false, ops); | |
46b5889c | 1752 | |
9e3307a1 | 1753 | return mtd_write_oob_std(mtd, to, ops); |
0c034fe3 EG |
1754 | } |
1755 | EXPORT_SYMBOL_GPL(mtd_write_oob); | |
1756 | ||
75eb2cec BB |
1757 | /** |
1758 | * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section | |
1759 | * @mtd: MTD device structure | |
1760 | * @section: ECC section. Depending on the layout you may have all the ECC | |
1761 | * bytes stored in a single contiguous section, or one section | |
1762 | * per ECC chunk (and sometime several sections for a single ECC | |
1763 | * ECC chunk) | |
1764 | * @oobecc: OOB region struct filled with the appropriate ECC position | |
1765 | * information | |
1766 | * | |
7da0fffb | 1767 | * This function returns ECC section information in the OOB area. If you want |
75eb2cec BB |
1768 | * to get all the ECC bytes information, then you should call |
1769 | * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE. | |
1770 | * | |
1771 | * Returns zero on success, a negative error code otherwise. | |
1772 | */ | |
1773 | int mtd_ooblayout_ecc(struct mtd_info *mtd, int section, | |
1774 | struct mtd_oob_region *oobecc) | |
1775 | { | |
46b5889c MR |
1776 | struct mtd_info *master = mtd_get_master(mtd); |
1777 | ||
75eb2cec BB |
1778 | memset(oobecc, 0, sizeof(*oobecc)); |
1779 | ||
46b5889c | 1780 | if (!master || section < 0) |
75eb2cec BB |
1781 | return -EINVAL; |
1782 | ||
46b5889c | 1783 | if (!master->ooblayout || !master->ooblayout->ecc) |
75eb2cec BB |
1784 | return -ENOTSUPP; |
1785 | ||
46b5889c | 1786 | return master->ooblayout->ecc(master, section, oobecc); |
75eb2cec BB |
1787 | } |
1788 | EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc); | |
1789 | ||
1790 | /** | |
1791 | * mtd_ooblayout_free - Get the OOB region definition of a specific free | |
1792 | * section | |
1793 | * @mtd: MTD device structure | |
1794 | * @section: Free section you are interested in. Depending on the layout | |
1795 | * you may have all the free bytes stored in a single contiguous | |
1796 | * section, or one section per ECC chunk plus an extra section | |
1797 | * for the remaining bytes (or other funky layout). | |
1798 | * @oobfree: OOB region struct filled with the appropriate free position | |
1799 | * information | |
1800 | * | |
7da0fffb | 1801 | * This function returns free bytes position in the OOB area. If you want |
75eb2cec BB |
1802 | * to get all the free bytes information, then you should call |
1803 | * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE. | |
1804 | * | |
1805 | * Returns zero on success, a negative error code otherwise. | |
1806 | */ | |
1807 | int mtd_ooblayout_free(struct mtd_info *mtd, int section, | |
1808 | struct mtd_oob_region *oobfree) | |
1809 | { | |
46b5889c MR |
1810 | struct mtd_info *master = mtd_get_master(mtd); |
1811 | ||
75eb2cec BB |
1812 | memset(oobfree, 0, sizeof(*oobfree)); |
1813 | ||
46b5889c | 1814 | if (!master || section < 0) |
75eb2cec BB |
1815 | return -EINVAL; |
1816 | ||
46b5889c | 1817 | if (!master->ooblayout || !master->ooblayout->free) |
75eb2cec BB |
1818 | return -ENOTSUPP; |
1819 | ||
46b5889c | 1820 | return master->ooblayout->free(master, section, oobfree); |
75eb2cec BB |
1821 | } |
1822 | EXPORT_SYMBOL_GPL(mtd_ooblayout_free); | |
1823 | ||
1824 | /** | |
1825 | * mtd_ooblayout_find_region - Find the region attached to a specific byte | |
1826 | * @mtd: mtd info structure | |
1827 | * @byte: the byte we are searching for | |
1828 | * @sectionp: pointer where the section id will be stored | |
1829 | * @oobregion: used to retrieve the ECC position | |
1830 | * @iter: iterator function. Should be either mtd_ooblayout_free or | |
1831 | * mtd_ooblayout_ecc depending on the region type you're searching for | |
1832 | * | |
7da0fffb | 1833 | * This function returns the section id and oobregion information of a |
75eb2cec BB |
1834 | * specific byte. For example, say you want to know where the 4th ECC byte is |
1835 | * stored, you'll use: | |
1836 | * | |
1837 | * mtd_ooblayout_find_region(mtd, 3, §ion, &oobregion, mtd_ooblayout_ecc); | |
1838 | * | |
1839 | * Returns zero on success, a negative error code otherwise. | |
1840 | */ | |
1841 | static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte, | |
1842 | int *sectionp, struct mtd_oob_region *oobregion, | |
1843 | int (*iter)(struct mtd_info *, | |
1844 | int section, | |
1845 | struct mtd_oob_region *oobregion)) | |
1846 | { | |
1847 | int pos = 0, ret, section = 0; | |
1848 | ||
1849 | memset(oobregion, 0, sizeof(*oobregion)); | |
1850 | ||
1851 | while (1) { | |
1852 | ret = iter(mtd, section, oobregion); | |
1853 | if (ret) | |
1854 | return ret; | |
1855 | ||
1856 | if (pos + oobregion->length > byte) | |
1857 | break; | |
1858 | ||
1859 | pos += oobregion->length; | |
1860 | section++; | |
1861 | } | |
1862 | ||
1863 | /* | |
1864 | * Adjust region info to make it start at the beginning at the | |
1865 | * 'start' ECC byte. | |
1866 | */ | |
1867 | oobregion->offset += byte - pos; | |
1868 | oobregion->length -= byte - pos; | |
1869 | *sectionp = section; | |
1870 | ||
1871 | return 0; | |
1872 | } | |
1873 | ||
1874 | /** | |
1875 | * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific | |
1876 | * ECC byte | |
1877 | * @mtd: mtd info structure | |
1878 | * @eccbyte: the byte we are searching for | |
6361f536 | 1879 | * @section: pointer where the section id will be stored |
75eb2cec BB |
1880 | * @oobregion: OOB region information |
1881 | * | |
1882 | * Works like mtd_ooblayout_find_region() except it searches for a specific ECC | |
1883 | * byte. | |
1884 | * | |
1885 | * Returns zero on success, a negative error code otherwise. | |
1886 | */ | |
1887 | int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte, | |
1888 | int *section, | |
1889 | struct mtd_oob_region *oobregion) | |
1890 | { | |
1891 | return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion, | |
1892 | mtd_ooblayout_ecc); | |
1893 | } | |
1894 | EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion); | |
1895 | ||
1896 | /** | |
1897 | * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer | |
1898 | * @mtd: mtd info structure | |
1899 | * @buf: destination buffer to store OOB bytes | |
1900 | * @oobbuf: OOB buffer | |
1901 | * @start: first byte to retrieve | |
1902 | * @nbytes: number of bytes to retrieve | |
1903 | * @iter: section iterator | |
1904 | * | |
1905 | * Extract bytes attached to a specific category (ECC or free) | |
1906 | * from the OOB buffer and copy them into buf. | |
1907 | * | |
1908 | * Returns zero on success, a negative error code otherwise. | |
1909 | */ | |
1910 | static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf, | |
1911 | const u8 *oobbuf, int start, int nbytes, | |
1912 | int (*iter)(struct mtd_info *, | |
1913 | int section, | |
1914 | struct mtd_oob_region *oobregion)) | |
1915 | { | |
8e8fd4d1 MY |
1916 | struct mtd_oob_region oobregion; |
1917 | int section, ret; | |
75eb2cec BB |
1918 | |
1919 | ret = mtd_ooblayout_find_region(mtd, start, §ion, | |
1920 | &oobregion, iter); | |
1921 | ||
1922 | while (!ret) { | |
1923 | int cnt; | |
1924 | ||
7c295ef9 | 1925 | cnt = min_t(int, nbytes, oobregion.length); |
75eb2cec BB |
1926 | memcpy(buf, oobbuf + oobregion.offset, cnt); |
1927 | buf += cnt; | |
1928 | nbytes -= cnt; | |
1929 | ||
1930 | if (!nbytes) | |
1931 | break; | |
1932 | ||
1933 | ret = iter(mtd, ++section, &oobregion); | |
1934 | } | |
1935 | ||
1936 | return ret; | |
1937 | } | |
1938 | ||
1939 | /** | |
1940 | * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer | |
1941 | * @mtd: mtd info structure | |
1942 | * @buf: source buffer to get OOB bytes from | |
1943 | * @oobbuf: OOB buffer | |
1944 | * @start: first OOB byte to set | |
1945 | * @nbytes: number of OOB bytes to set | |
1946 | * @iter: section iterator | |
1947 | * | |
1948 | * Fill the OOB buffer with data provided in buf. The category (ECC or free) | |
1949 | * is selected by passing the appropriate iterator. | |
1950 | * | |
1951 | * Returns zero on success, a negative error code otherwise. | |
1952 | */ | |
1953 | static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf, | |
1954 | u8 *oobbuf, int start, int nbytes, | |
1955 | int (*iter)(struct mtd_info *, | |
1956 | int section, | |
1957 | struct mtd_oob_region *oobregion)) | |
1958 | { | |
8e8fd4d1 MY |
1959 | struct mtd_oob_region oobregion; |
1960 | int section, ret; | |
75eb2cec BB |
1961 | |
1962 | ret = mtd_ooblayout_find_region(mtd, start, §ion, | |
1963 | &oobregion, iter); | |
1964 | ||
1965 | while (!ret) { | |
1966 | int cnt; | |
1967 | ||
7c295ef9 | 1968 | cnt = min_t(int, nbytes, oobregion.length); |
75eb2cec BB |
1969 | memcpy(oobbuf + oobregion.offset, buf, cnt); |
1970 | buf += cnt; | |
1971 | nbytes -= cnt; | |
1972 | ||
1973 | if (!nbytes) | |
1974 | break; | |
1975 | ||
1976 | ret = iter(mtd, ++section, &oobregion); | |
1977 | } | |
1978 | ||
1979 | return ret; | |
1980 | } | |
1981 | ||
1982 | /** | |
1983 | * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category | |
1984 | * @mtd: mtd info structure | |
1985 | * @iter: category iterator | |
1986 | * | |
1987 | * Count the number of bytes in a given category. | |
1988 | * | |
1989 | * Returns a positive value on success, a negative error code otherwise. | |
1990 | */ | |
1991 | static int mtd_ooblayout_count_bytes(struct mtd_info *mtd, | |
1992 | int (*iter)(struct mtd_info *, | |
1993 | int section, | |
1994 | struct mtd_oob_region *oobregion)) | |
1995 | { | |
4d6aecfb | 1996 | struct mtd_oob_region oobregion; |
75eb2cec BB |
1997 | int section = 0, ret, nbytes = 0; |
1998 | ||
1999 | while (1) { | |
2000 | ret = iter(mtd, section++, &oobregion); | |
2001 | if (ret) { | |
2002 | if (ret == -ERANGE) | |
2003 | ret = nbytes; | |
2004 | break; | |
2005 | } | |
2006 | ||
2007 | nbytes += oobregion.length; | |
2008 | } | |
2009 | ||
2010 | return ret; | |
2011 | } | |
2012 | ||
2013 | /** | |
2014 | * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer | |
2015 | * @mtd: mtd info structure | |
2016 | * @eccbuf: destination buffer to store ECC bytes | |
2017 | * @oobbuf: OOB buffer | |
2018 | * @start: first ECC byte to retrieve | |
2019 | * @nbytes: number of ECC bytes to retrieve | |
2020 | * | |
2021 | * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes. | |
2022 | * | |
2023 | * Returns zero on success, a negative error code otherwise. | |
2024 | */ | |
2025 | int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf, | |
2026 | const u8 *oobbuf, int start, int nbytes) | |
2027 | { | |
2028 | return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes, | |
2029 | mtd_ooblayout_ecc); | |
2030 | } | |
2031 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes); | |
2032 | ||
2033 | /** | |
2034 | * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer | |
2035 | * @mtd: mtd info structure | |
2036 | * @eccbuf: source buffer to get ECC bytes from | |
2037 | * @oobbuf: OOB buffer | |
2038 | * @start: first ECC byte to set | |
2039 | * @nbytes: number of ECC bytes to set | |
2040 | * | |
2041 | * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes. | |
2042 | * | |
2043 | * Returns zero on success, a negative error code otherwise. | |
2044 | */ | |
2045 | int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf, | |
2046 | u8 *oobbuf, int start, int nbytes) | |
2047 | { | |
2048 | return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes, | |
2049 | mtd_ooblayout_ecc); | |
2050 | } | |
2051 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes); | |
2052 | ||
2053 | /** | |
2054 | * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer | |
2055 | * @mtd: mtd info structure | |
2056 | * @databuf: destination buffer to store ECC bytes | |
2057 | * @oobbuf: OOB buffer | |
2058 | * @start: first ECC byte to retrieve | |
2059 | * @nbytes: number of ECC bytes to retrieve | |
2060 | * | |
2061 | * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. | |
2062 | * | |
2063 | * Returns zero on success, a negative error code otherwise. | |
2064 | */ | |
2065 | int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf, | |
2066 | const u8 *oobbuf, int start, int nbytes) | |
2067 | { | |
2068 | return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes, | |
2069 | mtd_ooblayout_free); | |
2070 | } | |
2071 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes); | |
2072 | ||
2073 | /** | |
c77a9312 | 2074 | * mtd_ooblayout_set_databytes - set data bytes into the oob buffer |
75eb2cec | 2075 | * @mtd: mtd info structure |
c77a9312 | 2076 | * @databuf: source buffer to get data bytes from |
75eb2cec BB |
2077 | * @oobbuf: OOB buffer |
2078 | * @start: first ECC byte to set | |
2079 | * @nbytes: number of ECC bytes to set | |
2080 | * | |
519494a9 | 2081 | * Works like mtd_ooblayout_set_bytes(), except it acts on free bytes. |
75eb2cec BB |
2082 | * |
2083 | * Returns zero on success, a negative error code otherwise. | |
2084 | */ | |
2085 | int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf, | |
2086 | u8 *oobbuf, int start, int nbytes) | |
2087 | { | |
2088 | return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes, | |
2089 | mtd_ooblayout_free); | |
2090 | } | |
2091 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes); | |
2092 | ||
2093 | /** | |
2094 | * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB | |
2095 | * @mtd: mtd info structure | |
2096 | * | |
2097 | * Works like mtd_ooblayout_count_bytes(), except it count free bytes. | |
2098 | * | |
2099 | * Returns zero on success, a negative error code otherwise. | |
2100 | */ | |
2101 | int mtd_ooblayout_count_freebytes(struct mtd_info *mtd) | |
2102 | { | |
2103 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free); | |
2104 | } | |
2105 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes); | |
2106 | ||
2107 | /** | |
c77a9312 | 2108 | * mtd_ooblayout_count_eccbytes - count the number of ECC bytes in OOB |
75eb2cec BB |
2109 | * @mtd: mtd info structure |
2110 | * | |
2111 | * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes. | |
2112 | * | |
2113 | * Returns zero on success, a negative error code otherwise. | |
2114 | */ | |
2115 | int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd) | |
2116 | { | |
2117 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc); | |
2118 | } | |
2119 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes); | |
2120 | ||
de3cac93 AB |
2121 | /* |
2122 | * Method to access the protection register area, present in some flash | |
2123 | * devices. The user data is one time programmable but the factory data is read | |
2124 | * only. | |
2125 | */ | |
4b78fc42 CR |
2126 | int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
2127 | struct otp_info *buf) | |
de3cac93 | 2128 | { |
46b5889c MR |
2129 | struct mtd_info *master = mtd_get_master(mtd); |
2130 | ||
2131 | if (!master->_get_fact_prot_info) | |
de3cac93 AB |
2132 | return -EOPNOTSUPP; |
2133 | if (!len) | |
2134 | return 0; | |
46b5889c | 2135 | return master->_get_fact_prot_info(master, len, retlen, buf); |
de3cac93 AB |
2136 | } |
2137 | EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info); | |
2138 | ||
2139 | int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
2140 | size_t *retlen, u_char *buf) | |
2141 | { | |
46b5889c MR |
2142 | struct mtd_info *master = mtd_get_master(mtd); |
2143 | ||
de3cac93 | 2144 | *retlen = 0; |
46b5889c | 2145 | if (!master->_read_fact_prot_reg) |
de3cac93 AB |
2146 | return -EOPNOTSUPP; |
2147 | if (!len) | |
2148 | return 0; | |
46b5889c | 2149 | return master->_read_fact_prot_reg(master, from, len, retlen, buf); |
de3cac93 AB |
2150 | } |
2151 | EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg); | |
2152 | ||
4b78fc42 CR |
2153 | int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
2154 | struct otp_info *buf) | |
de3cac93 | 2155 | { |
46b5889c MR |
2156 | struct mtd_info *master = mtd_get_master(mtd); |
2157 | ||
2158 | if (!master->_get_user_prot_info) | |
de3cac93 AB |
2159 | return -EOPNOTSUPP; |
2160 | if (!len) | |
2161 | return 0; | |
46b5889c | 2162 | return master->_get_user_prot_info(master, len, retlen, buf); |
de3cac93 AB |
2163 | } |
2164 | EXPORT_SYMBOL_GPL(mtd_get_user_prot_info); | |
2165 | ||
2166 | int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
2167 | size_t *retlen, u_char *buf) | |
2168 | { | |
46b5889c MR |
2169 | struct mtd_info *master = mtd_get_master(mtd); |
2170 | ||
de3cac93 | 2171 | *retlen = 0; |
46b5889c | 2172 | if (!master->_read_user_prot_reg) |
de3cac93 AB |
2173 | return -EOPNOTSUPP; |
2174 | if (!len) | |
2175 | return 0; | |
46b5889c | 2176 | return master->_read_user_prot_reg(master, from, len, retlen, buf); |
de3cac93 AB |
2177 | } |
2178 | EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg); | |
2179 | ||
2180 | int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, | |
1df1fc8c | 2181 | size_t *retlen, const u_char *buf) |
de3cac93 | 2182 | { |
46b5889c | 2183 | struct mtd_info *master = mtd_get_master(mtd); |
9a78bc83 CR |
2184 | int ret; |
2185 | ||
de3cac93 | 2186 | *retlen = 0; |
46b5889c | 2187 | if (!master->_write_user_prot_reg) |
de3cac93 AB |
2188 | return -EOPNOTSUPP; |
2189 | if (!len) | |
2190 | return 0; | |
46b5889c | 2191 | ret = master->_write_user_prot_reg(master, to, len, retlen, buf); |
9a78bc83 CR |
2192 | if (ret) |
2193 | return ret; | |
2194 | ||
2195 | /* | |
2196 | * If no data could be written at all, we are out of memory and | |
2197 | * must return -ENOSPC. | |
2198 | */ | |
2199 | return (*retlen) ? 0 : -ENOSPC; | |
de3cac93 AB |
2200 | } |
2201 | EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg); | |
2202 | ||
2203 | int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) | |
2204 | { | |
46b5889c MR |
2205 | struct mtd_info *master = mtd_get_master(mtd); |
2206 | ||
2207 | if (!master->_lock_user_prot_reg) | |
de3cac93 AB |
2208 | return -EOPNOTSUPP; |
2209 | if (!len) | |
2210 | return 0; | |
46b5889c | 2211 | return master->_lock_user_prot_reg(master, from, len); |
de3cac93 AB |
2212 | } |
2213 | EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg); | |
2214 | ||
e3c1f1c9 MW |
2215 | int mtd_erase_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) |
2216 | { | |
2217 | struct mtd_info *master = mtd_get_master(mtd); | |
2218 | ||
2219 | if (!master->_erase_user_prot_reg) | |
2220 | return -EOPNOTSUPP; | |
2221 | if (!len) | |
2222 | return 0; | |
2223 | return master->_erase_user_prot_reg(master, from, len); | |
2224 | } | |
2225 | EXPORT_SYMBOL_GPL(mtd_erase_user_prot_reg); | |
2226 | ||
8273a0c9 AB |
2227 | /* Chip-supported device locking */ |
2228 | int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
2229 | { | |
46b5889c MR |
2230 | struct mtd_info *master = mtd_get_master(mtd); |
2231 | ||
2232 | if (!master->_lock) | |
8273a0c9 | 2233 | return -EOPNOTSUPP; |
0c2b4e21 | 2234 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c9 | 2235 | return -EINVAL; |
bcb1d238 AB |
2236 | if (!len) |
2237 | return 0; | |
9e3307a1 BB |
2238 | |
2239 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) { | |
2240 | ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize; | |
2241 | len = (u64)mtd_div_by_eb(len, mtd) * master->erasesize; | |
2242 | } | |
2243 | ||
46b5889c | 2244 | return master->_lock(master, mtd_get_master_ofs(mtd, ofs), len); |
8273a0c9 AB |
2245 | } |
2246 | EXPORT_SYMBOL_GPL(mtd_lock); | |
2247 | ||
2248 | int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
2249 | { | |
46b5889c MR |
2250 | struct mtd_info *master = mtd_get_master(mtd); |
2251 | ||
2252 | if (!master->_unlock) | |
8273a0c9 | 2253 | return -EOPNOTSUPP; |
0c2b4e21 | 2254 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c9 | 2255 | return -EINVAL; |
bcb1d238 AB |
2256 | if (!len) |
2257 | return 0; | |
9e3307a1 BB |
2258 | |
2259 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) { | |
2260 | ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize; | |
2261 | len = (u64)mtd_div_by_eb(len, mtd) * master->erasesize; | |
2262 | } | |
2263 | ||
46b5889c | 2264 | return master->_unlock(master, mtd_get_master_ofs(mtd, ofs), len); |
8273a0c9 AB |
2265 | } |
2266 | EXPORT_SYMBOL_GPL(mtd_unlock); | |
2267 | ||
2268 | int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
2269 | { | |
46b5889c MR |
2270 | struct mtd_info *master = mtd_get_master(mtd); |
2271 | ||
2272 | if (!master->_is_locked) | |
8273a0c9 | 2273 | return -EOPNOTSUPP; |
0c2b4e21 | 2274 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c9 | 2275 | return -EINVAL; |
bcb1d238 AB |
2276 | if (!len) |
2277 | return 0; | |
9e3307a1 BB |
2278 | |
2279 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) { | |
2280 | ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize; | |
2281 | len = (u64)mtd_div_by_eb(len, mtd) * master->erasesize; | |
2282 | } | |
2283 | ||
46b5889c | 2284 | return master->_is_locked(master, mtd_get_master_ofs(mtd, ofs), len); |
8273a0c9 AB |
2285 | } |
2286 | EXPORT_SYMBOL_GPL(mtd_is_locked); | |
2287 | ||
8471bb73 | 2288 | int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs) |
8273a0c9 | 2289 | { |
46b5889c MR |
2290 | struct mtd_info *master = mtd_get_master(mtd); |
2291 | ||
0c2b4e21 | 2292 | if (ofs < 0 || ofs >= mtd->size) |
8471bb73 | 2293 | return -EINVAL; |
46b5889c | 2294 | if (!master->_block_isreserved) |
8273a0c9 | 2295 | return 0; |
9e3307a1 BB |
2296 | |
2297 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) | |
2298 | ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize; | |
2299 | ||
46b5889c | 2300 | return master->_block_isreserved(master, mtd_get_master_ofs(mtd, ofs)); |
8471bb73 EG |
2301 | } |
2302 | EXPORT_SYMBOL_GPL(mtd_block_isreserved); | |
2303 | ||
2304 | int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) | |
2305 | { | |
46b5889c MR |
2306 | struct mtd_info *master = mtd_get_master(mtd); |
2307 | ||
0c2b4e21 | 2308 | if (ofs < 0 || ofs >= mtd->size) |
8273a0c9 | 2309 | return -EINVAL; |
46b5889c | 2310 | if (!master->_block_isbad) |
8471bb73 | 2311 | return 0; |
9e3307a1 BB |
2312 | |
2313 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) | |
2314 | ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize; | |
2315 | ||
46b5889c | 2316 | return master->_block_isbad(master, mtd_get_master_ofs(mtd, ofs)); |
8273a0c9 AB |
2317 | } |
2318 | EXPORT_SYMBOL_GPL(mtd_block_isbad); | |
2319 | ||
2320 | int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
2321 | { | |
46b5889c MR |
2322 | struct mtd_info *master = mtd_get_master(mtd); |
2323 | int ret; | |
2324 | ||
2325 | if (!master->_block_markbad) | |
8273a0c9 | 2326 | return -EOPNOTSUPP; |
0c2b4e21 | 2327 | if (ofs < 0 || ofs >= mtd->size) |
8273a0c9 | 2328 | return -EINVAL; |
664addc2 AB |
2329 | if (!(mtd->flags & MTD_WRITEABLE)) |
2330 | return -EROFS; | |
46b5889c | 2331 | |
9e3307a1 BB |
2332 | if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) |
2333 | ofs = (loff_t)mtd_div_by_eb(ofs, mtd) * master->erasesize; | |
2334 | ||
46b5889c MR |
2335 | ret = master->_block_markbad(master, mtd_get_master_ofs(mtd, ofs)); |
2336 | if (ret) | |
2337 | return ret; | |
2338 | ||
2339 | while (mtd->parent) { | |
2340 | mtd->ecc_stats.badblocks++; | |
2341 | mtd = mtd->parent; | |
2342 | } | |
2343 | ||
2344 | return 0; | |
8273a0c9 AB |
2345 | } |
2346 | EXPORT_SYMBOL_GPL(mtd_block_markbad); | |
2347 | ||
52b02031 AB |
2348 | /* |
2349 | * default_mtd_writev - the default writev method | |
2350 | * @mtd: mtd device description object pointer | |
2351 | * @vecs: the vectors to write | |
2352 | * @count: count of vectors in @vecs | |
2353 | * @to: the MTD device offset to write to | |
2354 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
2355 | * | |
2356 | * This function returns zero in case of success and a negative error code in | |
2357 | * case of failure. | |
1da177e4 | 2358 | */ |
1dbebd32 AB |
2359 | static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, |
2360 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 LT |
2361 | { |
2362 | unsigned long i; | |
2363 | size_t totlen = 0, thislen; | |
2364 | int ret = 0; | |
2365 | ||
52b02031 AB |
2366 | for (i = 0; i < count; i++) { |
2367 | if (!vecs[i].iov_len) | |
2368 | continue; | |
2369 | ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen, | |
2370 | vecs[i].iov_base); | |
2371 | totlen += thislen; | |
2372 | if (ret || thislen != vecs[i].iov_len) | |
2373 | break; | |
2374 | to += vecs[i].iov_len; | |
1da177e4 | 2375 | } |
52b02031 | 2376 | *retlen = totlen; |
1da177e4 LT |
2377 | return ret; |
2378 | } | |
1dbebd32 AB |
2379 | |
2380 | /* | |
2381 | * mtd_writev - the vector-based MTD write method | |
2382 | * @mtd: mtd device description object pointer | |
2383 | * @vecs: the vectors to write | |
2384 | * @count: count of vectors in @vecs | |
2385 | * @to: the MTD device offset to write to | |
2386 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
2387 | * | |
2388 | * This function returns zero in case of success and a negative error code in | |
2389 | * case of failure. | |
2390 | */ | |
2391 | int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
2392 | unsigned long count, loff_t to, size_t *retlen) | |
2393 | { | |
46b5889c MR |
2394 | struct mtd_info *master = mtd_get_master(mtd); |
2395 | ||
1dbebd32 | 2396 | *retlen = 0; |
664addc2 AB |
2397 | if (!(mtd->flags & MTD_WRITEABLE)) |
2398 | return -EROFS; | |
46b5889c MR |
2399 | |
2400 | if (!master->_writev) | |
1dbebd32 | 2401 | return default_mtd_writev(mtd, vecs, count, to, retlen); |
46b5889c MR |
2402 | |
2403 | return master->_writev(master, vecs, count, | |
2404 | mtd_get_master_ofs(mtd, to), retlen); | |
1dbebd32 AB |
2405 | } |
2406 | EXPORT_SYMBOL_GPL(mtd_writev); | |
1da177e4 | 2407 | |
33b53716 GE |
2408 | /** |
2409 | * mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size | |
52b02031 AB |
2410 | * @mtd: mtd device description object pointer |
2411 | * @size: a pointer to the ideal or maximum size of the allocation, points | |
33b53716 GE |
2412 | * to the actual allocation size on success. |
2413 | * | |
2414 | * This routine attempts to allocate a contiguous kernel buffer up to | |
2415 | * the specified size, backing off the size of the request exponentially | |
2416 | * until the request succeeds or until the allocation size falls below | |
2417 | * the system page size. This attempts to make sure it does not adversely | |
2418 | * impact system performance, so when allocating more than one page, we | |
caf49191 LT |
2419 | * ask the memory allocator to avoid re-trying, swapping, writing back |
2420 | * or performing I/O. | |
33b53716 GE |
2421 | * |
2422 | * Note, this function also makes sure that the allocated buffer is aligned to | |
2423 | * the MTD device's min. I/O unit, i.e. the "mtd->writesize" value. | |
2424 | * | |
2425 | * This is called, for example by mtd_{read,write} and jffs2_scan_medium, | |
2426 | * to handle smaller (i.e. degraded) buffer allocations under low- or | |
2427 | * fragmented-memory situations where such reduced allocations, from a | |
2428 | * requested ideal, are allowed. | |
2429 | * | |
2430 | * Returns a pointer to the allocated buffer on success; otherwise, NULL. | |
2431 | */ | |
2432 | void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size) | |
2433 | { | |
d0164adc | 2434 | gfp_t flags = __GFP_NOWARN | __GFP_DIRECT_RECLAIM | __GFP_NORETRY; |
33b53716 GE |
2435 | size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE); |
2436 | void *kbuf; | |
2437 | ||
2438 | *size = min_t(size_t, *size, KMALLOC_MAX_SIZE); | |
2439 | ||
2440 | while (*size > min_alloc) { | |
2441 | kbuf = kmalloc(*size, flags); | |
2442 | if (kbuf) | |
2443 | return kbuf; | |
2444 | ||
2445 | *size >>= 1; | |
2446 | *size = ALIGN(*size, mtd->writesize); | |
2447 | } | |
2448 | ||
2449 | /* | |
2450 | * For the last resort allocation allow 'kmalloc()' to do all sorts of | |
2451 | * things (write-back, dropping caches, etc) by using GFP_KERNEL. | |
2452 | */ | |
2453 | return kmalloc(*size, GFP_KERNEL); | |
2454 | } | |
33b53716 | 2455 | EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to); |
1da177e4 | 2456 | |
2d2dce0e PM |
2457 | #ifdef CONFIG_PROC_FS |
2458 | ||
1da177e4 LT |
2459 | /*====================================================================*/ |
2460 | /* Support for /proc/mtd */ | |
2461 | ||
447d9bd8 | 2462 | static int mtd_proc_show(struct seq_file *m, void *v) |
1da177e4 | 2463 | { |
f1332ba2 | 2464 | struct mtd_info *mtd; |
1da177e4 | 2465 | |
447d9bd8 | 2466 | seq_puts(m, "dev: size erasesize name\n"); |
48b19268 | 2467 | mutex_lock(&mtd_table_mutex); |
f1332ba2 | 2468 | mtd_for_each_device(mtd) { |
447d9bd8 AD |
2469 | seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\"\n", |
2470 | mtd->index, (unsigned long long)mtd->size, | |
2471 | mtd->erasesize, mtd->name); | |
d5ca5129 | 2472 | } |
48b19268 | 2473 | mutex_unlock(&mtd_table_mutex); |
d5ca5129 | 2474 | return 0; |
1da177e4 | 2475 | } |
45b09076 KC |
2476 | #endif /* CONFIG_PROC_FS */ |
2477 | ||
1da177e4 LT |
2478 | /*====================================================================*/ |
2479 | /* Init code */ | |
2480 | ||
462d69a2 | 2481 | static struct backing_dev_info * __init mtd_bdi_init(const char *name) |
0661b1ac | 2482 | { |
445caaa2 | 2483 | struct backing_dev_info *bdi; |
0661b1ac JA |
2484 | int ret; |
2485 | ||
aef33c2f | 2486 | bdi = bdi_alloc(NUMA_NO_NODE); |
445caaa2 SL |
2487 | if (!bdi) |
2488 | return ERR_PTR(-ENOMEM); | |
55b2598e CH |
2489 | bdi->ra_pages = 0; |
2490 | bdi->io_pages = 0; | |
0661b1ac | 2491 | |
fa06052d JK |
2492 | /* |
2493 | * We put '-0' suffix to the name to get the same name format as we | |
2494 | * used to get. Since this is called only once, we get a unique name. | |
2495 | */ | |
7c4cc300 | 2496 | ret = bdi_register(bdi, "%.28s-0", name); |
0661b1ac | 2497 | if (ret) |
fa06052d | 2498 | bdi_put(bdi); |
0661b1ac | 2499 | |
445caaa2 | 2500 | return ret ? ERR_PTR(ret) : bdi; |
0661b1ac JA |
2501 | } |
2502 | ||
93e56214 AB |
2503 | static struct proc_dir_entry *proc_mtd; |
2504 | ||
1da177e4 LT |
2505 | static int __init init_mtd(void) |
2506 | { | |
15bce40c | 2507 | int ret; |
0661b1ac | 2508 | |
15bce40c | 2509 | ret = class_register(&mtd_class); |
0661b1ac JA |
2510 | if (ret) |
2511 | goto err_reg; | |
2512 | ||
445caaa2 SL |
2513 | mtd_bdi = mtd_bdi_init("mtd"); |
2514 | if (IS_ERR(mtd_bdi)) { | |
2515 | ret = PTR_ERR(mtd_bdi); | |
b4caecd4 | 2516 | goto err_bdi; |
445caaa2 | 2517 | } |
694bb7fc | 2518 | |
3f3942ac | 2519 | proc_mtd = proc_create_single("mtd", 0, NULL, mtd_proc_show); |
93e56214 | 2520 | |
660685d9 AB |
2521 | ret = init_mtdchar(); |
2522 | if (ret) | |
2523 | goto out_procfs; | |
2524 | ||
e8e3edb9 | 2525 | dfs_dir_mtd = debugfs_create_dir("mtd", NULL); |
67b967dd MR |
2526 | debugfs_create_bool("expert_analysis_mode", 0600, dfs_dir_mtd, |
2527 | &mtd_expert_analysis_mode); | |
e8e3edb9 | 2528 | |
1da177e4 | 2529 | return 0; |
0661b1ac | 2530 | |
660685d9 AB |
2531 | out_procfs: |
2532 | if (proc_mtd) | |
2533 | remove_proc_entry("mtd", NULL); | |
1aadf01e | 2534 | bdi_unregister(mtd_bdi); |
fa06052d | 2535 | bdi_put(mtd_bdi); |
b4caecd4 | 2536 | err_bdi: |
0661b1ac JA |
2537 | class_unregister(&mtd_class); |
2538 | err_reg: | |
2539 | pr_err("Error registering mtd class or bdi: %d\n", ret); | |
2540 | return ret; | |
1da177e4 LT |
2541 | } |
2542 | ||
2543 | static void __exit cleanup_mtd(void) | |
2544 | { | |
e8e3edb9 | 2545 | debugfs_remove_recursive(dfs_dir_mtd); |
660685d9 | 2546 | cleanup_mtdchar(); |
d5ca5129 | 2547 | if (proc_mtd) |
93e56214 | 2548 | remove_proc_entry("mtd", NULL); |
15bce40c | 2549 | class_unregister(&mtd_class); |
9718c59c | 2550 | bdi_unregister(mtd_bdi); |
fa06052d | 2551 | bdi_put(mtd_bdi); |
35667b99 | 2552 | idr_destroy(&mtd_idr); |
1da177e4 LT |
2553 | } |
2554 | ||
2555 | module_init(init_mtd); | |
2556 | module_exit(cleanup_mtd); | |
2557 | ||
1da177e4 LT |
2558 | MODULE_LICENSE("GPL"); |
2559 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
2560 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |