Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Core registration and callback routines for MTD |
| 3 | * drivers and users. |
| 4 | * |
David Woodhouse | a1452a3 | 2010-08-08 20:58:20 +0100 | [diff] [blame] | 5 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
| 6 | * Copyright © 2006 Red Hat UK Limited |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | */ |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/module.h> |
| 25 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/ptrace.h> |
Alexey Dobriyan | 447d9bd | 2011-05-13 23:34:19 +0300 | [diff] [blame] | 27 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/string.h> |
| 29 | #include <linux/timer.h> |
| 30 | #include <linux/major.h> |
| 31 | #include <linux/fs.h> |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 32 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/ioctl.h> |
| 34 | #include <linux/init.h> |
Brian Norris | 215a02f | 2015-11-11 16:26:04 -0800 | [diff] [blame] | 35 | #include <linux/of.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/proc_fs.h> |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 37 | #include <linux/idr.h> |
Jörn Engel | a33eb6b | 2010-04-27 09:40:52 +0200 | [diff] [blame] | 38 | #include <linux/backing-dev.h> |
Tejun Heo | 05d71b46 | 2010-03-30 02:52:39 +0900 | [diff] [blame] | 39 | #include <linux/gfp.h> |
David Howells | 0d01ff2 | 2013-04-11 23:51:01 +0100 | [diff] [blame] | 40 | #include <linux/slab.h> |
Brian Norris | 3efe41b | 2014-11-26 01:01:08 -0800 | [diff] [blame] | 41 | #include <linux/reboot.h> |
Ezequiel Garcia | fea728c | 2016-04-12 17:46:42 -0300 | [diff] [blame] | 42 | #include <linux/leds.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | #include <linux/mtd/mtd.h> |
Jamie Iles | f5671ab | 2011-05-23 17:15:46 +0100 | [diff] [blame] | 45 | #include <linux/mtd/partitions.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Ben Dooks | 356d70f | 2007-05-28 20:28:34 +0100 | [diff] [blame] | 47 | #include "mtdcore.h" |
Artem Bityutskiy | 660685d | 2013-03-14 13:27:40 +0200 | [diff] [blame] | 48 | |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 49 | static struct backing_dev_info *mtd_bdi; |
Ben Dooks | 356d70f | 2007-05-28 20:28:34 +0100 | [diff] [blame] | 50 | |
Lars-Peter Clausen | 57b8045 | 2015-04-06 12:00:39 +0200 | [diff] [blame] | 51 | #ifdef CONFIG_PM_SLEEP |
| 52 | |
| 53 | static int mtd_cls_suspend(struct device *dev) |
| 54 | { |
| 55 | struct mtd_info *mtd = dev_get_drvdata(dev); |
| 56 | |
| 57 | return mtd ? mtd_suspend(mtd) : 0; |
| 58 | } |
| 59 | |
| 60 | static int mtd_cls_resume(struct device *dev) |
| 61 | { |
| 62 | struct mtd_info *mtd = dev_get_drvdata(dev); |
| 63 | |
| 64 | if (mtd) |
| 65 | mtd_resume(mtd); |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static SIMPLE_DEV_PM_OPS(mtd_cls_pm_ops, mtd_cls_suspend, mtd_cls_resume); |
| 70 | #define MTD_CLS_PM_OPS (&mtd_cls_pm_ops) |
| 71 | #else |
| 72 | #define MTD_CLS_PM_OPS NULL |
| 73 | #endif |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 74 | |
David Woodhouse | 15bce40 | 2009-04-05 07:40:58 -0700 | [diff] [blame] | 75 | static struct class mtd_class = { |
| 76 | .name = "mtd", |
| 77 | .owner = THIS_MODULE, |
Lars-Peter Clausen | 57b8045 | 2015-04-06 12:00:39 +0200 | [diff] [blame] | 78 | .pm = MTD_CLS_PM_OPS, |
David Woodhouse | 15bce40 | 2009-04-05 07:40:58 -0700 | [diff] [blame] | 79 | }; |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 80 | |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 81 | static DEFINE_IDR(mtd_idr); |
| 82 | |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 83 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | should not use them for _anything_ else */ |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 85 | DEFINE_MUTEX(mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | EXPORT_SYMBOL_GPL(mtd_table_mutex); |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 87 | |
| 88 | struct mtd_info *__mtd_next_device(int i) |
| 89 | { |
| 90 | return idr_get_next(&mtd_idr, &i); |
| 91 | } |
| 92 | EXPORT_SYMBOL_GPL(__mtd_next_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | static LIST_HEAD(mtd_notifiers); |
| 95 | |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 96 | |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 97 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 98 | |
| 99 | /* REVISIT once MTD uses the driver model better, whoever allocates |
| 100 | * the mtd_info will probably want to use the release() hook... |
| 101 | */ |
| 102 | static void mtd_release(struct device *dev) |
| 103 | { |
Brian Norris | 5e47212 | 2014-07-21 19:06:47 -0700 | [diff] [blame] | 104 | struct mtd_info *mtd = dev_get_drvdata(dev); |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 105 | dev_t index = MTD_DEVT(mtd->index); |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 106 | |
Brian Norris | 5e47212 | 2014-07-21 19:06:47 -0700 | [diff] [blame] | 107 | /* remove /dev/mtdXro node */ |
| 108 | device_destroy(&mtd_class, index + 1); |
David Woodhouse | 15bce40 | 2009-04-05 07:40:58 -0700 | [diff] [blame] | 109 | } |
| 110 | |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 111 | static ssize_t mtd_type_show(struct device *dev, |
| 112 | struct device_attribute *attr, char *buf) |
| 113 | { |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 114 | struct mtd_info *mtd = dev_get_drvdata(dev); |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 115 | char *type; |
| 116 | |
| 117 | switch (mtd->type) { |
| 118 | case MTD_ABSENT: |
| 119 | type = "absent"; |
| 120 | break; |
| 121 | case MTD_RAM: |
| 122 | type = "ram"; |
| 123 | break; |
| 124 | case MTD_ROM: |
| 125 | type = "rom"; |
| 126 | break; |
| 127 | case MTD_NORFLASH: |
| 128 | type = "nor"; |
| 129 | break; |
| 130 | case MTD_NANDFLASH: |
| 131 | type = "nand"; |
| 132 | break; |
| 133 | case MTD_DATAFLASH: |
| 134 | type = "dataflash"; |
| 135 | break; |
| 136 | case MTD_UBIVOLUME: |
| 137 | type = "ubi"; |
| 138 | break; |
Huang Shijie | f483724 | 2013-09-25 14:58:19 +0800 | [diff] [blame] | 139 | case MTD_MLCNANDFLASH: |
| 140 | type = "mlc-nand"; |
| 141 | break; |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 142 | default: |
| 143 | type = "unknown"; |
| 144 | } |
| 145 | |
| 146 | return snprintf(buf, PAGE_SIZE, "%s\n", type); |
| 147 | } |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 148 | static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); |
| 149 | |
| 150 | static ssize_t mtd_flags_show(struct device *dev, |
| 151 | struct device_attribute *attr, char *buf) |
| 152 | { |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 153 | struct mtd_info *mtd = dev_get_drvdata(dev); |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 154 | |
| 155 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); |
| 156 | |
| 157 | } |
| 158 | static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); |
| 159 | |
| 160 | static ssize_t mtd_size_show(struct device *dev, |
| 161 | struct device_attribute *attr, char *buf) |
| 162 | { |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 163 | struct mtd_info *mtd = dev_get_drvdata(dev); |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 164 | |
| 165 | return snprintf(buf, PAGE_SIZE, "%llu\n", |
| 166 | (unsigned long long)mtd->size); |
| 167 | |
| 168 | } |
| 169 | static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); |
| 170 | |
| 171 | static ssize_t mtd_erasesize_show(struct device *dev, |
| 172 | struct device_attribute *attr, char *buf) |
| 173 | { |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 174 | struct mtd_info *mtd = dev_get_drvdata(dev); |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 175 | |
| 176 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); |
| 177 | |
| 178 | } |
| 179 | static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); |
| 180 | |
| 181 | static ssize_t mtd_writesize_show(struct device *dev, |
| 182 | struct device_attribute *attr, char *buf) |
| 183 | { |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 184 | struct mtd_info *mtd = dev_get_drvdata(dev); |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 185 | |
| 186 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); |
| 187 | |
| 188 | } |
| 189 | static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); |
| 190 | |
Artem Bityutskiy | e769354 | 2009-04-18 12:29:42 +0300 | [diff] [blame] | 191 | static ssize_t mtd_subpagesize_show(struct device *dev, |
| 192 | struct device_attribute *attr, char *buf) |
| 193 | { |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 194 | struct mtd_info *mtd = dev_get_drvdata(dev); |
Artem Bityutskiy | e769354 | 2009-04-18 12:29:42 +0300 | [diff] [blame] | 195 | unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; |
| 196 | |
| 197 | return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); |
| 198 | |
| 199 | } |
| 200 | static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); |
| 201 | |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 202 | static ssize_t mtd_oobsize_show(struct device *dev, |
| 203 | struct device_attribute *attr, char *buf) |
| 204 | { |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 205 | struct mtd_info *mtd = dev_get_drvdata(dev); |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 206 | |
| 207 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); |
| 208 | |
| 209 | } |
| 210 | static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); |
| 211 | |
| 212 | static ssize_t mtd_numeraseregions_show(struct device *dev, |
| 213 | struct device_attribute *attr, char *buf) |
| 214 | { |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 215 | struct mtd_info *mtd = dev_get_drvdata(dev); |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 216 | |
| 217 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); |
| 218 | |
| 219 | } |
| 220 | static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, |
| 221 | NULL); |
| 222 | |
| 223 | static ssize_t mtd_name_show(struct device *dev, |
| 224 | struct device_attribute *attr, char *buf) |
| 225 | { |
Artem Bityutskiy | d5de20a | 2011-12-29 18:00:29 +0200 | [diff] [blame] | 226 | struct mtd_info *mtd = dev_get_drvdata(dev); |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 227 | |
| 228 | return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); |
| 229 | |
| 230 | } |
| 231 | static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 232 | |
Mike Dunn | a9b672e | 2012-04-25 12:06:07 -0700 | [diff] [blame] | 233 | static ssize_t mtd_ecc_strength_show(struct device *dev, |
| 234 | struct device_attribute *attr, char *buf) |
| 235 | { |
| 236 | struct mtd_info *mtd = dev_get_drvdata(dev); |
| 237 | |
| 238 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength); |
| 239 | } |
| 240 | static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL); |
| 241 | |
Mike Dunn | d062d4e | 2012-04-25 12:06:08 -0700 | [diff] [blame] | 242 | static ssize_t mtd_bitflip_threshold_show(struct device *dev, |
| 243 | struct device_attribute *attr, |
| 244 | char *buf) |
| 245 | { |
| 246 | struct mtd_info *mtd = dev_get_drvdata(dev); |
| 247 | |
| 248 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->bitflip_threshold); |
| 249 | } |
| 250 | |
| 251 | static ssize_t mtd_bitflip_threshold_store(struct device *dev, |
| 252 | struct device_attribute *attr, |
| 253 | const char *buf, size_t count) |
| 254 | { |
| 255 | struct mtd_info *mtd = dev_get_drvdata(dev); |
| 256 | unsigned int bitflip_threshold; |
| 257 | int retval; |
| 258 | |
| 259 | retval = kstrtouint(buf, 0, &bitflip_threshold); |
| 260 | if (retval) |
| 261 | return retval; |
| 262 | |
| 263 | mtd->bitflip_threshold = bitflip_threshold; |
| 264 | return count; |
| 265 | } |
| 266 | static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR, |
| 267 | mtd_bitflip_threshold_show, |
| 268 | mtd_bitflip_threshold_store); |
| 269 | |
Huang Shijie | bf977e3 | 2013-08-16 10:10:05 +0800 | [diff] [blame] | 270 | static ssize_t mtd_ecc_step_size_show(struct device *dev, |
| 271 | struct device_attribute *attr, char *buf) |
| 272 | { |
| 273 | struct mtd_info *mtd = dev_get_drvdata(dev); |
| 274 | |
| 275 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_step_size); |
| 276 | |
| 277 | } |
| 278 | static DEVICE_ATTR(ecc_step_size, S_IRUGO, mtd_ecc_step_size_show, NULL); |
| 279 | |
Ezequiel Garcia | 990a3af | 2014-06-24 10:55:50 -0300 | [diff] [blame] | 280 | static ssize_t mtd_ecc_stats_corrected_show(struct device *dev, |
| 281 | struct device_attribute *attr, char *buf) |
| 282 | { |
| 283 | struct mtd_info *mtd = dev_get_drvdata(dev); |
| 284 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; |
| 285 | |
| 286 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->corrected); |
| 287 | } |
| 288 | static DEVICE_ATTR(corrected_bits, S_IRUGO, |
| 289 | mtd_ecc_stats_corrected_show, NULL); |
| 290 | |
| 291 | static ssize_t mtd_ecc_stats_errors_show(struct device *dev, |
| 292 | struct device_attribute *attr, char *buf) |
| 293 | { |
| 294 | struct mtd_info *mtd = dev_get_drvdata(dev); |
| 295 | struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; |
| 296 | |
| 297 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->failed); |
| 298 | } |
| 299 | static DEVICE_ATTR(ecc_failures, S_IRUGO, mtd_ecc_stats_errors_show, NULL); |
| 300 | |
| 301 | static ssize_t mtd_badblocks_show(struct device *dev, |
| 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 | |
| 307 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->badblocks); |
| 308 | } |
| 309 | static DEVICE_ATTR(bad_blocks, S_IRUGO, mtd_badblocks_show, NULL); |
| 310 | |
| 311 | static ssize_t mtd_bbtblocks_show(struct device *dev, |
| 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 | |
| 317 | return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->bbtblocks); |
| 318 | } |
| 319 | static DEVICE_ATTR(bbt_blocks, S_IRUGO, mtd_bbtblocks_show, NULL); |
| 320 | |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 321 | static struct attribute *mtd_attrs[] = { |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 322 | &dev_attr_type.attr, |
| 323 | &dev_attr_flags.attr, |
| 324 | &dev_attr_size.attr, |
| 325 | &dev_attr_erasesize.attr, |
| 326 | &dev_attr_writesize.attr, |
Artem Bityutskiy | e769354 | 2009-04-18 12:29:42 +0300 | [diff] [blame] | 327 | &dev_attr_subpagesize.attr, |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 328 | &dev_attr_oobsize.attr, |
| 329 | &dev_attr_numeraseregions.attr, |
| 330 | &dev_attr_name.attr, |
Mike Dunn | a9b672e | 2012-04-25 12:06:07 -0700 | [diff] [blame] | 331 | &dev_attr_ecc_strength.attr, |
Huang Shijie | bf977e3 | 2013-08-16 10:10:05 +0800 | [diff] [blame] | 332 | &dev_attr_ecc_step_size.attr, |
Ezequiel Garcia | 990a3af | 2014-06-24 10:55:50 -0300 | [diff] [blame] | 333 | &dev_attr_corrected_bits.attr, |
| 334 | &dev_attr_ecc_failures.attr, |
| 335 | &dev_attr_bad_blocks.attr, |
| 336 | &dev_attr_bbt_blocks.attr, |
Mike Dunn | d062d4e | 2012-04-25 12:06:08 -0700 | [diff] [blame] | 337 | &dev_attr_bitflip_threshold.attr, |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 338 | NULL, |
| 339 | }; |
Axel Lin | 54c738f | 2013-12-02 10:12:25 +0800 | [diff] [blame] | 340 | ATTRIBUTE_GROUPS(mtd); |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 341 | |
| 342 | static struct device_type mtd_devtype = { |
| 343 | .name = "mtd", |
| 344 | .groups = mtd_groups, |
| 345 | .release = mtd_release, |
| 346 | }; |
| 347 | |
Christoph Hellwig | b4caecd | 2015-01-14 10:42:32 +0100 | [diff] [blame] | 348 | #ifndef CONFIG_MMU |
| 349 | unsigned mtd_mmap_capabilities(struct mtd_info *mtd) |
| 350 | { |
| 351 | switch (mtd->type) { |
| 352 | case MTD_RAM: |
| 353 | return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | |
| 354 | NOMMU_MAP_READ | NOMMU_MAP_WRITE; |
| 355 | case MTD_ROM: |
| 356 | return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | |
| 357 | NOMMU_MAP_READ; |
| 358 | default: |
| 359 | return NOMMU_MAP_COPY; |
| 360 | } |
| 361 | } |
Arnd Bergmann | 706a4e5 | 2015-01-28 11:09:20 -0700 | [diff] [blame] | 362 | EXPORT_SYMBOL_GPL(mtd_mmap_capabilities); |
Christoph Hellwig | b4caecd | 2015-01-14 10:42:32 +0100 | [diff] [blame] | 363 | #endif |
| 364 | |
Brian Norris | 3efe41b | 2014-11-26 01:01:08 -0800 | [diff] [blame] | 365 | static int mtd_reboot_notifier(struct notifier_block *n, unsigned long state, |
| 366 | void *cmd) |
| 367 | { |
| 368 | struct mtd_info *mtd; |
| 369 | |
| 370 | mtd = container_of(n, struct mtd_info, reboot_notifier); |
| 371 | mtd->_reboot(mtd); |
| 372 | |
| 373 | return NOTIFY_DONE; |
| 374 | } |
| 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | /** |
Boris Brezillon | 477b022 | 2015-11-16 15:53:13 +0100 | [diff] [blame] | 377 | * mtd_wunit_to_pairing_info - get pairing information of a wunit |
| 378 | * @mtd: pointer to new MTD device info structure |
| 379 | * @wunit: write unit we are interested in |
| 380 | * @info: returned pairing information |
| 381 | * |
| 382 | * Retrieve pairing information associated to the wunit. |
| 383 | * This is mainly useful when dealing with MLC/TLC NANDs where pages can be |
| 384 | * paired together, and where programming a page may influence the page it is |
| 385 | * paired with. |
| 386 | * The notion of page is replaced by the term wunit (write-unit) to stay |
| 387 | * consistent with the ->writesize field. |
| 388 | * |
| 389 | * The @wunit argument can be extracted from an absolute offset using |
| 390 | * mtd_offset_to_wunit(). @info is filled with the pairing information attached |
| 391 | * to @wunit. |
| 392 | * |
| 393 | * From the pairing info the MTD user can find all the wunits paired with |
| 394 | * @wunit using the following loop: |
| 395 | * |
| 396 | * for (i = 0; i < mtd_pairing_groups(mtd); i++) { |
| 397 | * info.pair = i; |
| 398 | * mtd_pairing_info_to_wunit(mtd, &info); |
| 399 | * ... |
| 400 | * } |
| 401 | */ |
| 402 | int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit, |
| 403 | struct mtd_pairing_info *info) |
| 404 | { |
| 405 | int npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd); |
| 406 | |
| 407 | if (wunit < 0 || wunit >= npairs) |
| 408 | return -EINVAL; |
| 409 | |
| 410 | if (mtd->pairing && mtd->pairing->get_info) |
| 411 | return mtd->pairing->get_info(mtd, wunit, info); |
| 412 | |
| 413 | info->group = 0; |
| 414 | info->pair = wunit; |
| 415 | |
| 416 | return 0; |
| 417 | } |
| 418 | EXPORT_SYMBOL_GPL(mtd_wunit_to_pairing_info); |
| 419 | |
| 420 | /** |
| 421 | * mtd_wunit_to_pairing_info - get wunit from pairing information |
| 422 | * @mtd: pointer to new MTD device info structure |
| 423 | * @info: pairing information struct |
| 424 | * |
| 425 | * Returns a positive number representing the wunit associated to the info |
| 426 | * struct, or a negative error code. |
| 427 | * |
| 428 | * This is the reverse of mtd_wunit_to_pairing_info(), and can help one to |
| 429 | * iterate over all wunits of a given pair (see mtd_wunit_to_pairing_info() |
| 430 | * doc). |
| 431 | * |
| 432 | * It can also be used to only program the first page of each pair (i.e. |
| 433 | * page attached to group 0), which allows one to use an MLC NAND in |
| 434 | * software-emulated SLC mode: |
| 435 | * |
| 436 | * info.group = 0; |
| 437 | * npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd); |
| 438 | * for (info.pair = 0; info.pair < npairs; info.pair++) { |
| 439 | * wunit = mtd_pairing_info_to_wunit(mtd, &info); |
| 440 | * mtd_write(mtd, mtd_wunit_to_offset(mtd, blkoffs, wunit), |
| 441 | * mtd->writesize, &retlen, buf + (i * mtd->writesize)); |
| 442 | * } |
| 443 | */ |
| 444 | int mtd_pairing_info_to_wunit(struct mtd_info *mtd, |
| 445 | const struct mtd_pairing_info *info) |
| 446 | { |
| 447 | int ngroups = mtd_pairing_groups(mtd); |
| 448 | int npairs = mtd_wunit_per_eb(mtd) / ngroups; |
| 449 | |
| 450 | if (!info || info->pair < 0 || info->pair >= npairs || |
| 451 | info->group < 0 || info->group >= ngroups) |
| 452 | return -EINVAL; |
| 453 | |
| 454 | if (mtd->pairing && mtd->pairing->get_wunit) |
| 455 | return mtd->pairing->get_wunit(mtd, info); |
| 456 | |
| 457 | return info->pair; |
| 458 | } |
| 459 | EXPORT_SYMBOL_GPL(mtd_pairing_info_to_wunit); |
| 460 | |
| 461 | /** |
| 462 | * mtd_pairing_groups - get the number of pairing groups |
| 463 | * @mtd: pointer to new MTD device info structure |
| 464 | * |
| 465 | * Returns the number of pairing groups. |
| 466 | * |
| 467 | * This number is usually equal to the number of bits exposed by a single |
| 468 | * cell, and can be used in conjunction with mtd_pairing_info_to_wunit() |
| 469 | * to iterate over all pages of a given pair. |
| 470 | */ |
| 471 | int mtd_pairing_groups(struct mtd_info *mtd) |
| 472 | { |
| 473 | if (!mtd->pairing || !mtd->pairing->ngroups) |
| 474 | return 1; |
| 475 | |
| 476 | return mtd->pairing->ngroups; |
| 477 | } |
| 478 | EXPORT_SYMBOL_GPL(mtd_pairing_groups); |
| 479 | |
| 480 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | * add_mtd_device - register an MTD device |
| 482 | * @mtd: pointer to new MTD device info structure |
| 483 | * |
| 484 | * Add a device to the list of MTD devices present in the system, and |
| 485 | * notify each currently active MTD 'user' of its arrival. Returns |
Brian Norris | 57dd990 | 2015-06-01 16:17:18 -0700 | [diff] [blame] | 486 | * zero on success or non-zero on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | */ |
| 488 | |
| 489 | int add_mtd_device(struct mtd_info *mtd) |
| 490 | { |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 491 | struct mtd_notifier *not; |
| 492 | int i, error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
Brian Norris | be0dbff | 2015-06-01 16:17:20 -0700 | [diff] [blame] | 494 | /* |
| 495 | * May occur, for instance, on buggy drivers which call |
| 496 | * mtd_device_parse_register() multiple times on the same master MTD, |
| 497 | * especially with CONFIG_MTD_PARTITIONED_MASTER=y. |
| 498 | */ |
| 499 | if (WARN_ONCE(mtd->backing_dev_info, "MTD already registered\n")) |
| 500 | return -EEXIST; |
| 501 | |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 502 | mtd->backing_dev_info = mtd_bdi; |
David Howells | 402d326 | 2009-02-12 10:40:00 +0000 | [diff] [blame] | 503 | |
Artem B. Bityutskiy | 783ed81 | 2006-06-14 19:53:44 +0400 | [diff] [blame] | 504 | BUG_ON(mtd->writesize == 0); |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 505 | mutex_lock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Tejun Heo | 589e9c4 | 2013-02-27 17:04:33 -0800 | [diff] [blame] | 507 | i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); |
Brian Norris | 57dd990 | 2015-06-01 16:17:18 -0700 | [diff] [blame] | 508 | if (i < 0) { |
| 509 | error = i; |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 510 | goto fail_locked; |
Brian Norris | 57dd990 | 2015-06-01 16:17:18 -0700 | [diff] [blame] | 511 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 513 | mtd->index = i; |
| 514 | mtd->usecount = 0; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 515 | |
Mike Dunn | d062d4e | 2012-04-25 12:06:08 -0700 | [diff] [blame] | 516 | /* default value if not set by driver */ |
| 517 | if (mtd->bitflip_threshold == 0) |
| 518 | mtd->bitflip_threshold = mtd->ecc_strength; |
| 519 | |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 520 | if (is_power_of_2(mtd->erasesize)) |
| 521 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; |
| 522 | else |
| 523 | mtd->erasesize_shift = 0; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 524 | |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 525 | if (is_power_of_2(mtd->writesize)) |
| 526 | mtd->writesize_shift = ffs(mtd->writesize) - 1; |
| 527 | else |
| 528 | mtd->writesize_shift = 0; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 529 | |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 530 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; |
| 531 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; |
Håvard Skinnemoen | 187ef15 | 2006-09-22 10:07:08 +0100 | [diff] [blame] | 532 | |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 533 | /* Some chips always power up locked. Unlock them now */ |
Artem Bityutskiy | 3813456 | 2011-12-30 17:00:35 +0200 | [diff] [blame] | 534 | if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { |
| 535 | error = mtd_unlock(mtd, 0, mtd->size); |
| 536 | if (error && error != -EOPNOTSUPP) |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 537 | printk(KERN_WARNING |
| 538 | "%s: unlock failed, writes may not work\n", |
| 539 | mtd->name); |
Brian Norris | 57dd990 | 2015-06-01 16:17:18 -0700 | [diff] [blame] | 540 | /* Ignore unlock failures? */ |
| 541 | error = 0; |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 542 | } |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 543 | |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 544 | /* Caller should have set dev.parent to match the |
Frans Klaver | 260e89a | 2015-06-10 22:38:15 +0200 | [diff] [blame] | 545 | * physical device, if appropriate. |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 546 | */ |
| 547 | mtd->dev.type = &mtd_devtype; |
| 548 | mtd->dev.class = &mtd_class; |
| 549 | mtd->dev.devt = MTD_DEVT(i); |
| 550 | dev_set_name(&mtd->dev, "mtd%d", i); |
| 551 | dev_set_drvdata(&mtd->dev, mtd); |
Brian Norris | 215a02f | 2015-11-11 16:26:04 -0800 | [diff] [blame] | 552 | of_node_get(mtd_get_of_node(mtd)); |
Brian Norris | 57dd990 | 2015-06-01 16:17:18 -0700 | [diff] [blame] | 553 | error = device_register(&mtd->dev); |
| 554 | if (error) |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 555 | goto fail_added; |
David Brownell | 1f24b5a | 2009-03-26 00:42:41 -0700 | [diff] [blame] | 556 | |
Brian Norris | 5e47212 | 2014-07-21 19:06:47 -0700 | [diff] [blame] | 557 | device_create(&mtd_class, mtd->dev.parent, MTD_DEVT(i) + 1, NULL, |
| 558 | "mtd%dro", i); |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 559 | |
Brian Norris | 289c052 | 2011-07-19 10:06:09 -0700 | [diff] [blame] | 560 | pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 561 | /* No need to get a refcount on the module containing |
| 562 | the notifier, since we hold the mtd_table_mutex */ |
| 563 | list_for_each_entry(not, &mtd_notifiers, list) |
| 564 | not->add(mtd); |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 565 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 566 | mutex_unlock(&mtd_table_mutex); |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 567 | /* We _know_ we aren't being removed, because |
| 568 | our caller is still holding us here. So none |
| 569 | of this try_ nonsense, and no bitching about it |
| 570 | either. :) */ |
| 571 | __module_get(THIS_MODULE); |
| 572 | return 0; |
| 573 | |
| 574 | fail_added: |
Brian Norris | 215a02f | 2015-11-11 16:26:04 -0800 | [diff] [blame] | 575 | of_node_put(mtd_get_of_node(mtd)); |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 576 | idr_remove(&mtd_idr, i); |
| 577 | fail_locked: |
| 578 | mutex_unlock(&mtd_table_mutex); |
Brian Norris | 57dd990 | 2015-06-01 16:17:18 -0700 | [diff] [blame] | 579 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | /** |
| 583 | * del_mtd_device - unregister an MTD device |
| 584 | * @mtd: pointer to MTD device info structure |
| 585 | * |
| 586 | * Remove a device from the list of MTD devices present in the system, |
| 587 | * and notify each currently active MTD 'user' of its departure. |
| 588 | * Returns zero on success or 1 on failure, which currently will happen |
| 589 | * if the requested device does not appear to be present in the list. |
| 590 | */ |
| 591 | |
Jamie Iles | eea72d5 | 2011-05-23 10:23:42 +0100 | [diff] [blame] | 592 | int del_mtd_device(struct mtd_info *mtd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | { |
| 594 | int ret; |
Maxim Levitsky | 75c0b84 | 2010-02-22 20:39:32 +0200 | [diff] [blame] | 595 | struct mtd_notifier *not; |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 596 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 597 | mutex_lock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 599 | if (idr_find(&mtd_idr, mtd->index) != mtd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | ret = -ENODEV; |
Maxim Levitsky | 75c0b84 | 2010-02-22 20:39:32 +0200 | [diff] [blame] | 601 | goto out_error; |
| 602 | } |
| 603 | |
| 604 | /* No need to get a refcount on the module containing |
| 605 | the notifier, since we hold the mtd_table_mutex */ |
| 606 | list_for_each_entry(not, &mtd_notifiers, list) |
| 607 | not->remove(mtd); |
| 608 | |
| 609 | if (mtd->usecount) { |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 610 | printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | mtd->index, mtd->name, mtd->usecount); |
| 612 | ret = -EBUSY; |
| 613 | } else { |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 614 | device_unregister(&mtd->dev); |
| 615 | |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 616 | idr_remove(&mtd_idr, mtd->index); |
Brian Norris | 215a02f | 2015-11-11 16:26:04 -0800 | [diff] [blame] | 617 | of_node_put(mtd_get_of_node(mtd)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | module_put(THIS_MODULE); |
| 620 | ret = 0; |
| 621 | } |
| 622 | |
Maxim Levitsky | 75c0b84 | 2010-02-22 20:39:32 +0200 | [diff] [blame] | 623 | out_error: |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 624 | mutex_unlock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | return ret; |
| 626 | } |
| 627 | |
Dan Ehrenberg | 727dc61 | 2015-04-02 15:15:10 -0700 | [diff] [blame] | 628 | static int mtd_add_device_partitions(struct mtd_info *mtd, |
Brian Norris | 07fd2f8 | 2015-12-04 15:25:17 -0800 | [diff] [blame] | 629 | struct mtd_partitions *parts) |
Dan Ehrenberg | 727dc61 | 2015-04-02 15:15:10 -0700 | [diff] [blame] | 630 | { |
Brian Norris | 07fd2f8 | 2015-12-04 15:25:17 -0800 | [diff] [blame] | 631 | const struct mtd_partition *real_parts = parts->parts; |
| 632 | int nbparts = parts->nr_parts; |
Dan Ehrenberg | 727dc61 | 2015-04-02 15:15:10 -0700 | [diff] [blame] | 633 | int ret; |
| 634 | |
| 635 | if (nbparts == 0 || IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) { |
| 636 | ret = add_mtd_device(mtd); |
Brian Norris | 57dd990 | 2015-06-01 16:17:18 -0700 | [diff] [blame] | 637 | if (ret) |
| 638 | return ret; |
Dan Ehrenberg | 727dc61 | 2015-04-02 15:15:10 -0700 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | if (nbparts > 0) { |
| 642 | ret = add_mtd_partitions(mtd, real_parts, nbparts); |
| 643 | if (ret && IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) |
| 644 | del_mtd_device(mtd); |
| 645 | return ret; |
| 646 | } |
| 647 | |
| 648 | return 0; |
| 649 | } |
| 650 | |
Brian Norris | 472b444 | 2015-12-11 15:58:01 -0800 | [diff] [blame] | 651 | /* |
| 652 | * Set a few defaults based on the parent devices, if not provided by the |
| 653 | * driver |
| 654 | */ |
| 655 | static void mtd_set_dev_defaults(struct mtd_info *mtd) |
| 656 | { |
| 657 | if (mtd->dev.parent) { |
| 658 | if (!mtd->owner && mtd->dev.parent->driver) |
| 659 | mtd->owner = mtd->dev.parent->driver->owner; |
| 660 | if (!mtd->name) |
| 661 | mtd->name = dev_name(mtd->dev.parent); |
| 662 | } else { |
| 663 | pr_debug("mtd device won't show a device symlink in sysfs\n"); |
| 664 | } |
| 665 | } |
Dan Ehrenberg | 727dc61 | 2015-04-02 15:15:10 -0700 | [diff] [blame] | 666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | /** |
Dmitry Eremin-Solenikov | 1c4c215 | 2011-03-25 22:26:25 +0300 | [diff] [blame] | 668 | * mtd_device_parse_register - parse partitions and register an MTD device. |
| 669 | * |
| 670 | * @mtd: the MTD device to register |
| 671 | * @types: the list of MTD partition probes to try, see |
| 672 | * 'parse_mtd_partitions()' for more information |
Dmitry Eremin-Solenikov | c797533 | 2011-06-10 18:18:28 +0400 | [diff] [blame] | 673 | * @parser_data: MTD partition parser-specific data |
Dmitry Eremin-Solenikov | 1c4c215 | 2011-03-25 22:26:25 +0300 | [diff] [blame] | 674 | * @parts: fallback partition information to register, if parsing fails; |
| 675 | * only valid if %nr_parts > %0 |
| 676 | * @nr_parts: the number of partitions in parts, if zero then the full |
| 677 | * MTD device is registered if no partition info is found |
| 678 | * |
| 679 | * This function aggregates MTD partitions parsing (done by |
| 680 | * 'parse_mtd_partitions()') and MTD device and partitions registering. It |
| 681 | * basically follows the most common pattern found in many MTD drivers: |
| 682 | * |
| 683 | * * It first tries to probe partitions on MTD device @mtd using parsers |
| 684 | * specified in @types (if @types is %NULL, then the default list of parsers |
| 685 | * is used, see 'parse_mtd_partitions()' for more information). If none are |
| 686 | * found this functions tries to fallback to information specified in |
| 687 | * @parts/@nr_parts. |
Brian Norris | 92394b5c | 2011-07-20 09:53:42 -0700 | [diff] [blame] | 688 | * * If any partitioning info was found, this function registers the found |
Dan Ehrenberg | 727dc61 | 2015-04-02 15:15:10 -0700 | [diff] [blame] | 689 | * partitions. If the MTD_PARTITIONED_MASTER option is set, then the device |
| 690 | * as a whole is registered first. |
Dmitry Eremin-Solenikov | 1c4c215 | 2011-03-25 22:26:25 +0300 | [diff] [blame] | 691 | * * If no partitions were found this function just registers the MTD device |
| 692 | * @mtd and exits. |
| 693 | * |
| 694 | * Returns zero in case of success and a negative error code in case of failure. |
| 695 | */ |
Artem Bityutskiy | 26a4734 | 2013-03-11 15:38:48 +0200 | [diff] [blame] | 696 | int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types, |
Dmitry Eremin-Solenikov | c797533 | 2011-06-10 18:18:28 +0400 | [diff] [blame] | 697 | struct mtd_part_parser_data *parser_data, |
Dmitry Eremin-Solenikov | 1c4c215 | 2011-03-25 22:26:25 +0300 | [diff] [blame] | 698 | const struct mtd_partition *parts, |
| 699 | int nr_parts) |
| 700 | { |
Brian Norris | 07fd2f8 | 2015-12-04 15:25:17 -0800 | [diff] [blame] | 701 | struct mtd_partitions parsed; |
Dan Ehrenberg | 727dc61 | 2015-04-02 15:15:10 -0700 | [diff] [blame] | 702 | int ret; |
Dmitry Eremin-Solenikov | 1c4c215 | 2011-03-25 22:26:25 +0300 | [diff] [blame] | 703 | |
Brian Norris | 472b444 | 2015-12-11 15:58:01 -0800 | [diff] [blame] | 704 | mtd_set_dev_defaults(mtd); |
| 705 | |
Brian Norris | 07fd2f8 | 2015-12-04 15:25:17 -0800 | [diff] [blame] | 706 | memset(&parsed, 0, sizeof(parsed)); |
| 707 | |
| 708 | ret = parse_mtd_partitions(mtd, types, &parsed, parser_data); |
| 709 | if ((ret < 0 || parsed.nr_parts == 0) && parts && nr_parts) { |
| 710 | /* Fall back to driver-provided partitions */ |
| 711 | parsed = (struct mtd_partitions){ |
| 712 | .parts = parts, |
| 713 | .nr_parts = nr_parts, |
| 714 | }; |
| 715 | } else if (ret < 0) { |
| 716 | /* Didn't come up with parsed OR fallback partitions */ |
Brian Norris | 5a2415b | 2015-10-11 13:03:47 -0700 | [diff] [blame] | 717 | pr_info("mtd: failed to find partitions; one or more parsers reports errors (%d)\n", |
| 718 | ret); |
| 719 | /* Don't abort on errors; we can still use unpartitioned MTD */ |
Brian Norris | 07fd2f8 | 2015-12-04 15:25:17 -0800 | [diff] [blame] | 720 | memset(&parsed, 0, sizeof(parsed)); |
Brian Norris | 3e00ed0 | 2015-06-01 16:17:19 -0700 | [diff] [blame] | 721 | } |
Dmitry Eremin-Solenikov | 1c4c215 | 2011-03-25 22:26:25 +0300 | [diff] [blame] | 722 | |
Brian Norris | 07fd2f8 | 2015-12-04 15:25:17 -0800 | [diff] [blame] | 723 | ret = mtd_add_device_partitions(mtd, &parsed); |
Brian Norris | 3e00ed0 | 2015-06-01 16:17:19 -0700 | [diff] [blame] | 724 | if (ret) |
| 725 | goto out; |
Dmitry Eremin-Solenikov | 1c4c215 | 2011-03-25 22:26:25 +0300 | [diff] [blame] | 726 | |
Niklas Cassel | e1dd864 | 2015-02-01 02:08:50 +0100 | [diff] [blame] | 727 | /* |
| 728 | * FIXME: some drivers unfortunately call this function more than once. |
| 729 | * So we have to check if we've already assigned the reboot notifier. |
| 730 | * |
| 731 | * Generally, we can make multiple calls work for most cases, but it |
| 732 | * does cause problems with parse_mtd_partitions() above (e.g., |
| 733 | * cmdlineparts will register partitions more than once). |
| 734 | */ |
Brian Norris | f8479dd | 2015-11-03 17:01:53 -0800 | [diff] [blame] | 735 | WARN_ONCE(mtd->_reboot && mtd->reboot_notifier.notifier_call, |
| 736 | "MTD already registered\n"); |
Niklas Cassel | e1dd864 | 2015-02-01 02:08:50 +0100 | [diff] [blame] | 737 | if (mtd->_reboot && !mtd->reboot_notifier.notifier_call) { |
Brian Norris | 3efe41b | 2014-11-26 01:01:08 -0800 | [diff] [blame] | 738 | mtd->reboot_notifier.notifier_call = mtd_reboot_notifier; |
| 739 | register_reboot_notifier(&mtd->reboot_notifier); |
| 740 | } |
| 741 | |
Brian Norris | 3e00ed0 | 2015-06-01 16:17:19 -0700 | [diff] [blame] | 742 | out: |
Brian Norris | c42c271 | 2015-12-04 15:25:16 -0800 | [diff] [blame] | 743 | /* Cleanup any parsed partitions */ |
Brian Norris | adc83bf | 2015-12-09 10:24:03 -0800 | [diff] [blame] | 744 | mtd_part_parser_cleanup(&parsed); |
Dan Ehrenberg | 727dc61 | 2015-04-02 15:15:10 -0700 | [diff] [blame] | 745 | return ret; |
Dmitry Eremin-Solenikov | 1c4c215 | 2011-03-25 22:26:25 +0300 | [diff] [blame] | 746 | } |
| 747 | EXPORT_SYMBOL_GPL(mtd_device_parse_register); |
| 748 | |
| 749 | /** |
Jamie Iles | f5671ab | 2011-05-23 17:15:46 +0100 | [diff] [blame] | 750 | * mtd_device_unregister - unregister an existing MTD device. |
| 751 | * |
| 752 | * @master: the MTD device to unregister. This will unregister both the master |
| 753 | * and any partitions if registered. |
| 754 | */ |
| 755 | int mtd_device_unregister(struct mtd_info *master) |
| 756 | { |
| 757 | int err; |
| 758 | |
Brian Norris | 3efe41b | 2014-11-26 01:01:08 -0800 | [diff] [blame] | 759 | if (master->_reboot) |
| 760 | unregister_reboot_notifier(&master->reboot_notifier); |
| 761 | |
Jamie Iles | f5671ab | 2011-05-23 17:15:46 +0100 | [diff] [blame] | 762 | err = del_mtd_partitions(master); |
| 763 | if (err) |
| 764 | return err; |
| 765 | |
| 766 | if (!device_is_registered(&master->dev)) |
| 767 | return 0; |
| 768 | |
| 769 | return del_mtd_device(master); |
| 770 | } |
| 771 | EXPORT_SYMBOL_GPL(mtd_device_unregister); |
| 772 | |
| 773 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | * register_mtd_user - register a 'user' of MTD devices. |
| 775 | * @new: pointer to notifier info structure |
| 776 | * |
| 777 | * Registers a pair of callbacks function to be called upon addition |
| 778 | * or removal of MTD devices. Causes the 'add' callback to be immediately |
| 779 | * invoked for each MTD device currently present in the system. |
| 780 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | void register_mtd_user (struct mtd_notifier *new) |
| 782 | { |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 783 | struct mtd_info *mtd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 785 | mutex_lock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
| 787 | list_add(&new->list, &mtd_notifiers); |
| 788 | |
Wanlong Gao | d5ca512 | 2011-05-20 21:14:30 +0800 | [diff] [blame] | 789 | __module_get(THIS_MODULE); |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 790 | |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 791 | mtd_for_each_device(mtd) |
| 792 | new->add(mtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 794 | mutex_unlock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |
Artem Bityutskiy | 33c87b4 | 2011-12-30 16:11:14 +0200 | [diff] [blame] | 796 | EXPORT_SYMBOL_GPL(register_mtd_user); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | /** |
Artem B. Bityuckiy | 4945079 | 2005-02-18 14:34:54 +0000 | [diff] [blame] | 799 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
| 800 | * @old: pointer to notifier info structure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | * |
| 802 | * Removes a callback function pair from the list of 'users' to be |
| 803 | * notified upon addition or removal of MTD devices. Causes the |
| 804 | * 'remove' callback to be immediately invoked for each MTD device |
| 805 | * currently present in the system. |
| 806 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | int unregister_mtd_user (struct mtd_notifier *old) |
| 808 | { |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 809 | struct mtd_info *mtd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 811 | mutex_lock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
| 813 | module_put(THIS_MODULE); |
| 814 | |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 815 | mtd_for_each_device(mtd) |
| 816 | old->remove(mtd); |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 817 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | list_del(&old->list); |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 819 | mutex_unlock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | return 0; |
| 821 | } |
Artem Bityutskiy | 33c87b4 | 2011-12-30 16:11:14 +0200 | [diff] [blame] | 822 | EXPORT_SYMBOL_GPL(unregister_mtd_user); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
| 824 | /** |
| 825 | * get_mtd_device - obtain a validated handle for an MTD device |
| 826 | * @mtd: last known address of the required MTD device |
| 827 | * @num: internal device number of the required MTD device |
| 828 | * |
| 829 | * Given a number and NULL address, return the num'th entry in the device |
| 830 | * table, if any. Given an address and num == -1, search the device table |
| 831 | * for a device with that address and return if it's still present. Given |
Artem Bityutskiy | 9c74034 | 2006-10-11 14:52:47 +0300 | [diff] [blame] | 832 | * both, return the num'th driver only if its address matches. Return |
| 833 | * error code if not. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
| 836 | { |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 837 | struct mtd_info *ret = NULL, *other; |
| 838 | int err = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 840 | mutex_lock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
| 842 | if (num == -1) { |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 843 | mtd_for_each_device(other) { |
| 844 | if (other == mtd) { |
| 845 | ret = mtd; |
| 846 | break; |
| 847 | } |
| 848 | } |
Ben Hutchings | b520e41 | 2010-01-29 20:59:42 +0000 | [diff] [blame] | 849 | } else if (num >= 0) { |
| 850 | ret = idr_find(&mtd_idr, num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | if (mtd && mtd != ret) |
| 852 | ret = NULL; |
| 853 | } |
| 854 | |
Maxim Levitsky | 3bd4565 | 2010-02-22 20:39:28 +0200 | [diff] [blame] | 855 | if (!ret) { |
| 856 | ret = ERR_PTR(err); |
| 857 | goto out; |
Artem Bityutskiy | 9fe912c | 2006-10-11 14:52:45 +0300 | [diff] [blame] | 858 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | |
Maxim Levitsky | 3bd4565 | 2010-02-22 20:39:28 +0200 | [diff] [blame] | 860 | err = __get_mtd_device(ret); |
| 861 | if (err) |
| 862 | ret = ERR_PTR(err); |
| 863 | out: |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 864 | mutex_unlock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | return ret; |
Maxim Levitsky | 3bd4565 | 2010-02-22 20:39:28 +0200 | [diff] [blame] | 866 | } |
Artem Bityutskiy | 33c87b4 | 2011-12-30 16:11:14 +0200 | [diff] [blame] | 867 | EXPORT_SYMBOL_GPL(get_mtd_device); |
Artem Bityutskiy | 9c74034 | 2006-10-11 14:52:47 +0300 | [diff] [blame] | 868 | |
Maxim Levitsky | 3bd4565 | 2010-02-22 20:39:28 +0200 | [diff] [blame] | 869 | |
| 870 | int __get_mtd_device(struct mtd_info *mtd) |
| 871 | { |
| 872 | int err; |
| 873 | |
| 874 | if (!try_module_get(mtd->owner)) |
| 875 | return -ENODEV; |
| 876 | |
Artem Bityutskiy | 3c3c10b | 2012-01-30 14:58:32 +0200 | [diff] [blame] | 877 | if (mtd->_get_device) { |
| 878 | err = mtd->_get_device(mtd); |
Maxim Levitsky | 3bd4565 | 2010-02-22 20:39:28 +0200 | [diff] [blame] | 879 | |
| 880 | if (err) { |
| 881 | module_put(mtd->owner); |
| 882 | return err; |
| 883 | } |
| 884 | } |
| 885 | mtd->usecount++; |
| 886 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | } |
Artem Bityutskiy | 33c87b4 | 2011-12-30 16:11:14 +0200 | [diff] [blame] | 888 | EXPORT_SYMBOL_GPL(__get_mtd_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 890 | /** |
| 891 | * get_mtd_device_nm - obtain a validated handle for an MTD device by |
| 892 | * device name |
| 893 | * @name: MTD device name to open |
| 894 | * |
| 895 | * This function returns MTD device description structure in case of |
| 896 | * success and an error code in case of failure. |
| 897 | */ |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 898 | struct mtd_info *get_mtd_device_nm(const char *name) |
| 899 | { |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 900 | int err = -ENODEV; |
| 901 | struct mtd_info *mtd = NULL, *other; |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 902 | |
| 903 | mutex_lock(&mtd_table_mutex); |
| 904 | |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 905 | mtd_for_each_device(other) { |
| 906 | if (!strcmp(name, other->name)) { |
| 907 | mtd = other; |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 908 | break; |
| 909 | } |
| 910 | } |
| 911 | |
Artem Bityutskiy | 9fe912c | 2006-10-11 14:52:45 +0300 | [diff] [blame] | 912 | if (!mtd) |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 913 | goto out_unlock; |
| 914 | |
Wanlong Gao | 52534f2 | 2011-05-17 22:36:18 +0800 | [diff] [blame] | 915 | err = __get_mtd_device(mtd); |
| 916 | if (err) |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 917 | goto out_unlock; |
| 918 | |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 919 | mutex_unlock(&mtd_table_mutex); |
| 920 | return mtd; |
Artem Bityutskiy | 9fe912c | 2006-10-11 14:52:45 +0300 | [diff] [blame] | 921 | |
Artem Bityutskiy | 9fe912c | 2006-10-11 14:52:45 +0300 | [diff] [blame] | 922 | out_unlock: |
| 923 | mutex_unlock(&mtd_table_mutex); |
| 924 | return ERR_PTR(err); |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 925 | } |
Artem Bityutskiy | 33c87b4 | 2011-12-30 16:11:14 +0200 | [diff] [blame] | 926 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); |
Artem Bityutskiy | 7799308 | 2006-10-11 14:52:44 +0300 | [diff] [blame] | 927 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | void put_mtd_device(struct mtd_info *mtd) |
| 929 | { |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 930 | mutex_lock(&mtd_table_mutex); |
Maxim Levitsky | 3bd4565 | 2010-02-22 20:39:28 +0200 | [diff] [blame] | 931 | __put_mtd_device(mtd); |
| 932 | mutex_unlock(&mtd_table_mutex); |
| 933 | |
| 934 | } |
Artem Bityutskiy | 33c87b4 | 2011-12-30 16:11:14 +0200 | [diff] [blame] | 935 | EXPORT_SYMBOL_GPL(put_mtd_device); |
Maxim Levitsky | 3bd4565 | 2010-02-22 20:39:28 +0200 | [diff] [blame] | 936 | |
| 937 | void __put_mtd_device(struct mtd_info *mtd) |
| 938 | { |
| 939 | --mtd->usecount; |
| 940 | BUG_ON(mtd->usecount < 0); |
| 941 | |
Artem Bityutskiy | 3c3c10b | 2012-01-30 14:58:32 +0200 | [diff] [blame] | 942 | if (mtd->_put_device) |
| 943 | mtd->_put_device(mtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
| 945 | module_put(mtd->owner); |
| 946 | } |
Artem Bityutskiy | 33c87b4 | 2011-12-30 16:11:14 +0200 | [diff] [blame] | 947 | EXPORT_SYMBOL_GPL(__put_mtd_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | |
Artem Bityutskiy | 52b0203 | 2011-12-30 15:57:25 +0200 | [diff] [blame] | 949 | /* |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 950 | * Erase is an asynchronous operation. Device drivers are supposed |
| 951 | * to call instr->callback() whenever the operation completes, even |
| 952 | * if it completes with a failure. |
| 953 | * Callers are supposed to pass a callback function and wait for it |
| 954 | * to be called before writing to the block. |
| 955 | */ |
| 956 | int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) |
| 957 | { |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 958 | if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 959 | return -EINVAL; |
Artem Bityutskiy | 664addc | 2012-02-03 18:13:23 +0200 | [diff] [blame] | 960 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 961 | return -EROFS; |
Shmulik Ladkani | 3b27dac | 2012-02-09 15:36:29 +0200 | [diff] [blame] | 962 | instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; |
Artem Bityutskiy | bcb1d23 | 2012-02-06 13:27:43 +0200 | [diff] [blame] | 963 | if (!instr->len) { |
| 964 | instr->state = MTD_ERASE_DONE; |
| 965 | mtd_erase_callback(instr); |
| 966 | return 0; |
| 967 | } |
Ezequiel Garcia | fea728c | 2016-04-12 17:46:42 -0300 | [diff] [blame] | 968 | ledtrig_mtd_activity(); |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 969 | return mtd->_erase(mtd, instr); |
| 970 | } |
| 971 | EXPORT_SYMBOL_GPL(mtd_erase); |
| 972 | |
| 973 | /* |
| 974 | * This stuff for eXecute-In-Place. phys is optional and may be set to NULL. |
| 975 | */ |
| 976 | int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, |
| 977 | void **virt, resource_size_t *phys) |
| 978 | { |
| 979 | *retlen = 0; |
Artem Bityutskiy | 0dd5235 | 2012-02-08 15:13:26 +0200 | [diff] [blame] | 980 | *virt = NULL; |
| 981 | if (phys) |
| 982 | *phys = 0; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 983 | if (!mtd->_point) |
| 984 | return -EOPNOTSUPP; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 985 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 986 | return -EINVAL; |
Artem Bityutskiy | bcb1d23 | 2012-02-06 13:27:43 +0200 | [diff] [blame] | 987 | if (!len) |
| 988 | return 0; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 989 | return mtd->_point(mtd, from, len, retlen, virt, phys); |
| 990 | } |
| 991 | EXPORT_SYMBOL_GPL(mtd_point); |
| 992 | |
| 993 | /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ |
| 994 | int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
| 995 | { |
| 996 | if (!mtd->_point) |
| 997 | return -EOPNOTSUPP; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 998 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 999 | return -EINVAL; |
Artem Bityutskiy | bcb1d23 | 2012-02-06 13:27:43 +0200 | [diff] [blame] | 1000 | if (!len) |
| 1001 | return 0; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1002 | return mtd->_unpoint(mtd, from, len); |
| 1003 | } |
| 1004 | EXPORT_SYMBOL_GPL(mtd_unpoint); |
| 1005 | |
| 1006 | /* |
| 1007 | * Allow NOMMU mmap() to directly map the device (if not NULL) |
| 1008 | * - return the address to which the offset maps |
| 1009 | * - return -ENOSYS to indicate refusal to do the mapping |
| 1010 | */ |
| 1011 | unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, |
| 1012 | unsigned long offset, unsigned long flags) |
| 1013 | { |
| 1014 | if (!mtd->_get_unmapped_area) |
| 1015 | return -EOPNOTSUPP; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1016 | if (offset >= mtd->size || len > mtd->size - offset) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1017 | return -EINVAL; |
| 1018 | return mtd->_get_unmapped_area(mtd, len, offset, flags); |
| 1019 | } |
| 1020 | EXPORT_SYMBOL_GPL(mtd_get_unmapped_area); |
| 1021 | |
| 1022 | int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, |
| 1023 | u_char *buf) |
| 1024 | { |
Mike Dunn | edbc4540 | 2012-04-25 12:06:11 -0700 | [diff] [blame] | 1025 | int ret_code; |
Artem Bityutskiy | 834247e | 2012-02-06 12:39:07 +0200 | [diff] [blame] | 1026 | *retlen = 0; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1027 | if (from < 0 || from >= mtd->size || len > mtd->size - from) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1028 | return -EINVAL; |
Artem Bityutskiy | bcb1d23 | 2012-02-06 13:27:43 +0200 | [diff] [blame] | 1029 | if (!len) |
| 1030 | return 0; |
Mike Dunn | edbc4540 | 2012-04-25 12:06:11 -0700 | [diff] [blame] | 1031 | |
Ezequiel Garcia | fea728c | 2016-04-12 17:46:42 -0300 | [diff] [blame] | 1032 | ledtrig_mtd_activity(); |
Mike Dunn | edbc4540 | 2012-04-25 12:06:11 -0700 | [diff] [blame] | 1033 | /* |
| 1034 | * In the absence of an error, drivers return a non-negative integer |
| 1035 | * representing the maximum number of bitflips that were corrected on |
| 1036 | * any one ecc region (if applicable; zero otherwise). |
| 1037 | */ |
| 1038 | ret_code = mtd->_read(mtd, from, len, retlen, buf); |
| 1039 | if (unlikely(ret_code < 0)) |
| 1040 | return ret_code; |
| 1041 | if (mtd->ecc_strength == 0) |
| 1042 | return 0; /* device lacks ecc */ |
| 1043 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1044 | } |
| 1045 | EXPORT_SYMBOL_GPL(mtd_read); |
| 1046 | |
| 1047 | int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, |
| 1048 | const u_char *buf) |
| 1049 | { |
| 1050 | *retlen = 0; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1051 | if (to < 0 || to >= mtd->size || len > mtd->size - to) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1052 | return -EINVAL; |
Artem Bityutskiy | 664addc | 2012-02-03 18:13:23 +0200 | [diff] [blame] | 1053 | if (!mtd->_write || !(mtd->flags & MTD_WRITEABLE)) |
| 1054 | return -EROFS; |
Artem Bityutskiy | bcb1d23 | 2012-02-06 13:27:43 +0200 | [diff] [blame] | 1055 | if (!len) |
| 1056 | return 0; |
Ezequiel Garcia | fea728c | 2016-04-12 17:46:42 -0300 | [diff] [blame] | 1057 | ledtrig_mtd_activity(); |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1058 | return mtd->_write(mtd, to, len, retlen, buf); |
| 1059 | } |
| 1060 | EXPORT_SYMBOL_GPL(mtd_write); |
| 1061 | |
| 1062 | /* |
| 1063 | * In blackbox flight recorder like scenarios we want to make successful writes |
| 1064 | * in interrupt context. panic_write() is only intended to be called when its |
| 1065 | * known the kernel is about to panic and we need the write to succeed. Since |
| 1066 | * the kernel is not going to be running for much longer, this function can |
| 1067 | * break locks and delay to ensure the write succeeds (but not sleep). |
| 1068 | */ |
| 1069 | int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, |
| 1070 | const u_char *buf) |
| 1071 | { |
| 1072 | *retlen = 0; |
| 1073 | if (!mtd->_panic_write) |
| 1074 | return -EOPNOTSUPP; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1075 | if (to < 0 || to >= mtd->size || len > mtd->size - to) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1076 | return -EINVAL; |
Artem Bityutskiy | 664addc | 2012-02-03 18:13:23 +0200 | [diff] [blame] | 1077 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 1078 | return -EROFS; |
Artem Bityutskiy | bcb1d23 | 2012-02-06 13:27:43 +0200 | [diff] [blame] | 1079 | if (!len) |
| 1080 | return 0; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1081 | return mtd->_panic_write(mtd, to, len, retlen, buf); |
| 1082 | } |
| 1083 | EXPORT_SYMBOL_GPL(mtd_panic_write); |
| 1084 | |
Brian Norris | d2d4848 | 2012-06-22 16:35:38 -0700 | [diff] [blame] | 1085 | int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) |
| 1086 | { |
Brian Norris | e47f685 | 2012-06-22 16:35:39 -0700 | [diff] [blame] | 1087 | int ret_code; |
Brian Norris | d2d4848 | 2012-06-22 16:35:38 -0700 | [diff] [blame] | 1088 | ops->retlen = ops->oobretlen = 0; |
| 1089 | if (!mtd->_read_oob) |
| 1090 | return -EOPNOTSUPP; |
Ezequiel Garcia | fea728c | 2016-04-12 17:46:42 -0300 | [diff] [blame] | 1091 | |
| 1092 | ledtrig_mtd_activity(); |
Brian Norris | e47f685 | 2012-06-22 16:35:39 -0700 | [diff] [blame] | 1093 | /* |
| 1094 | * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics |
| 1095 | * similar to mtd->_read(), returning a non-negative integer |
| 1096 | * representing max bitflips. In other cases, mtd->_read_oob() may |
| 1097 | * return -EUCLEAN. In all cases, perform similar logic to mtd_read(). |
| 1098 | */ |
| 1099 | ret_code = mtd->_read_oob(mtd, from, ops); |
| 1100 | if (unlikely(ret_code < 0)) |
| 1101 | return ret_code; |
| 1102 | if (mtd->ecc_strength == 0) |
| 1103 | return 0; /* device lacks ecc */ |
| 1104 | return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; |
Brian Norris | d2d4848 | 2012-06-22 16:35:38 -0700 | [diff] [blame] | 1105 | } |
| 1106 | EXPORT_SYMBOL_GPL(mtd_read_oob); |
| 1107 | |
Ezequiel Garcia | 0c034fe | 2016-04-12 17:46:39 -0300 | [diff] [blame] | 1108 | int mtd_write_oob(struct mtd_info *mtd, loff_t to, |
| 1109 | struct mtd_oob_ops *ops) |
| 1110 | { |
| 1111 | ops->retlen = ops->oobretlen = 0; |
| 1112 | if (!mtd->_write_oob) |
| 1113 | return -EOPNOTSUPP; |
| 1114 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 1115 | return -EROFS; |
Ezequiel Garcia | fea728c | 2016-04-12 17:46:42 -0300 | [diff] [blame] | 1116 | ledtrig_mtd_activity(); |
Ezequiel Garcia | 0c034fe | 2016-04-12 17:46:39 -0300 | [diff] [blame] | 1117 | return mtd->_write_oob(mtd, to, ops); |
| 1118 | } |
| 1119 | EXPORT_SYMBOL_GPL(mtd_write_oob); |
| 1120 | |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1121 | /** |
| 1122 | * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section |
| 1123 | * @mtd: MTD device structure |
| 1124 | * @section: ECC section. Depending on the layout you may have all the ECC |
| 1125 | * bytes stored in a single contiguous section, or one section |
| 1126 | * per ECC chunk (and sometime several sections for a single ECC |
| 1127 | * ECC chunk) |
| 1128 | * @oobecc: OOB region struct filled with the appropriate ECC position |
| 1129 | * information |
| 1130 | * |
| 1131 | * This functions return ECC section information in the OOB area. I you want |
| 1132 | * to get all the ECC bytes information, then you should call |
| 1133 | * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE. |
| 1134 | * |
| 1135 | * Returns zero on success, a negative error code otherwise. |
| 1136 | */ |
| 1137 | int mtd_ooblayout_ecc(struct mtd_info *mtd, int section, |
| 1138 | struct mtd_oob_region *oobecc) |
| 1139 | { |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1140 | memset(oobecc, 0, sizeof(*oobecc)); |
| 1141 | |
| 1142 | if (!mtd || section < 0) |
| 1143 | return -EINVAL; |
| 1144 | |
Boris Brezillon | adbbc3b | 2016-02-03 19:01:31 +0100 | [diff] [blame] | 1145 | if (!mtd->ooblayout || !mtd->ooblayout->ecc) |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1146 | return -ENOTSUPP; |
| 1147 | |
Boris Brezillon | adbbc3b | 2016-02-03 19:01:31 +0100 | [diff] [blame] | 1148 | return mtd->ooblayout->ecc(mtd, section, oobecc); |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1149 | } |
| 1150 | EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc); |
| 1151 | |
| 1152 | /** |
| 1153 | * mtd_ooblayout_free - Get the OOB region definition of a specific free |
| 1154 | * section |
| 1155 | * @mtd: MTD device structure |
| 1156 | * @section: Free section you are interested in. Depending on the layout |
| 1157 | * you may have all the free bytes stored in a single contiguous |
| 1158 | * section, or one section per ECC chunk plus an extra section |
| 1159 | * for the remaining bytes (or other funky layout). |
| 1160 | * @oobfree: OOB region struct filled with the appropriate free position |
| 1161 | * information |
| 1162 | * |
| 1163 | * This functions return free bytes position in the OOB area. I you want |
| 1164 | * to get all the free bytes information, then you should call |
| 1165 | * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE. |
| 1166 | * |
| 1167 | * Returns zero on success, a negative error code otherwise. |
| 1168 | */ |
| 1169 | int mtd_ooblayout_free(struct mtd_info *mtd, int section, |
| 1170 | struct mtd_oob_region *oobfree) |
| 1171 | { |
| 1172 | memset(oobfree, 0, sizeof(*oobfree)); |
| 1173 | |
| 1174 | if (!mtd || section < 0) |
| 1175 | return -EINVAL; |
| 1176 | |
Boris Brezillon | adbbc3b | 2016-02-03 19:01:31 +0100 | [diff] [blame] | 1177 | if (!mtd->ooblayout || !mtd->ooblayout->free) |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1178 | return -ENOTSUPP; |
| 1179 | |
Boris Brezillon | adbbc3b | 2016-02-03 19:01:31 +0100 | [diff] [blame] | 1180 | return mtd->ooblayout->free(mtd, section, oobfree); |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1181 | } |
| 1182 | EXPORT_SYMBOL_GPL(mtd_ooblayout_free); |
| 1183 | |
| 1184 | /** |
| 1185 | * mtd_ooblayout_find_region - Find the region attached to a specific byte |
| 1186 | * @mtd: mtd info structure |
| 1187 | * @byte: the byte we are searching for |
| 1188 | * @sectionp: pointer where the section id will be stored |
| 1189 | * @oobregion: used to retrieve the ECC position |
| 1190 | * @iter: iterator function. Should be either mtd_ooblayout_free or |
| 1191 | * mtd_ooblayout_ecc depending on the region type you're searching for |
| 1192 | * |
| 1193 | * This functions returns the section id and oobregion information of a |
| 1194 | * specific byte. For example, say you want to know where the 4th ECC byte is |
| 1195 | * stored, you'll use: |
| 1196 | * |
| 1197 | * mtd_ooblayout_find_region(mtd, 3, §ion, &oobregion, mtd_ooblayout_ecc); |
| 1198 | * |
| 1199 | * Returns zero on success, a negative error code otherwise. |
| 1200 | */ |
| 1201 | static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte, |
| 1202 | int *sectionp, struct mtd_oob_region *oobregion, |
| 1203 | int (*iter)(struct mtd_info *, |
| 1204 | int section, |
| 1205 | struct mtd_oob_region *oobregion)) |
| 1206 | { |
| 1207 | int pos = 0, ret, section = 0; |
| 1208 | |
| 1209 | memset(oobregion, 0, sizeof(*oobregion)); |
| 1210 | |
| 1211 | while (1) { |
| 1212 | ret = iter(mtd, section, oobregion); |
| 1213 | if (ret) |
| 1214 | return ret; |
| 1215 | |
| 1216 | if (pos + oobregion->length > byte) |
| 1217 | break; |
| 1218 | |
| 1219 | pos += oobregion->length; |
| 1220 | section++; |
| 1221 | } |
| 1222 | |
| 1223 | /* |
| 1224 | * Adjust region info to make it start at the beginning at the |
| 1225 | * 'start' ECC byte. |
| 1226 | */ |
| 1227 | oobregion->offset += byte - pos; |
| 1228 | oobregion->length -= byte - pos; |
| 1229 | *sectionp = section; |
| 1230 | |
| 1231 | return 0; |
| 1232 | } |
| 1233 | |
| 1234 | /** |
| 1235 | * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific |
| 1236 | * ECC byte |
| 1237 | * @mtd: mtd info structure |
| 1238 | * @eccbyte: the byte we are searching for |
| 1239 | * @sectionp: pointer where the section id will be stored |
| 1240 | * @oobregion: OOB region information |
| 1241 | * |
| 1242 | * Works like mtd_ooblayout_find_region() except it searches for a specific ECC |
| 1243 | * byte. |
| 1244 | * |
| 1245 | * Returns zero on success, a negative error code otherwise. |
| 1246 | */ |
| 1247 | int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte, |
| 1248 | int *section, |
| 1249 | struct mtd_oob_region *oobregion) |
| 1250 | { |
| 1251 | return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion, |
| 1252 | mtd_ooblayout_ecc); |
| 1253 | } |
| 1254 | EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion); |
| 1255 | |
| 1256 | /** |
| 1257 | * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer |
| 1258 | * @mtd: mtd info structure |
| 1259 | * @buf: destination buffer to store OOB bytes |
| 1260 | * @oobbuf: OOB buffer |
| 1261 | * @start: first byte to retrieve |
| 1262 | * @nbytes: number of bytes to retrieve |
| 1263 | * @iter: section iterator |
| 1264 | * |
| 1265 | * Extract bytes attached to a specific category (ECC or free) |
| 1266 | * from the OOB buffer and copy them into buf. |
| 1267 | * |
| 1268 | * Returns zero on success, a negative error code otherwise. |
| 1269 | */ |
| 1270 | static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf, |
| 1271 | const u8 *oobbuf, int start, int nbytes, |
| 1272 | int (*iter)(struct mtd_info *, |
| 1273 | int section, |
| 1274 | struct mtd_oob_region *oobregion)) |
| 1275 | { |
Masahiro Yamada | 8e8fd4d | 2016-11-09 11:08:08 +0900 | [diff] [blame] | 1276 | struct mtd_oob_region oobregion; |
| 1277 | int section, ret; |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1278 | |
| 1279 | ret = mtd_ooblayout_find_region(mtd, start, §ion, |
| 1280 | &oobregion, iter); |
| 1281 | |
| 1282 | while (!ret) { |
| 1283 | int cnt; |
| 1284 | |
Masahiro Yamada | 7c295ef | 2016-11-09 11:08:09 +0900 | [diff] [blame] | 1285 | cnt = min_t(int, nbytes, oobregion.length); |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1286 | memcpy(buf, oobbuf + oobregion.offset, cnt); |
| 1287 | buf += cnt; |
| 1288 | nbytes -= cnt; |
| 1289 | |
| 1290 | if (!nbytes) |
| 1291 | break; |
| 1292 | |
| 1293 | ret = iter(mtd, ++section, &oobregion); |
| 1294 | } |
| 1295 | |
| 1296 | return ret; |
| 1297 | } |
| 1298 | |
| 1299 | /** |
| 1300 | * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer |
| 1301 | * @mtd: mtd info structure |
| 1302 | * @buf: source buffer to get OOB bytes from |
| 1303 | * @oobbuf: OOB buffer |
| 1304 | * @start: first OOB byte to set |
| 1305 | * @nbytes: number of OOB bytes to set |
| 1306 | * @iter: section iterator |
| 1307 | * |
| 1308 | * Fill the OOB buffer with data provided in buf. The category (ECC or free) |
| 1309 | * is selected by passing the appropriate iterator. |
| 1310 | * |
| 1311 | * Returns zero on success, a negative error code otherwise. |
| 1312 | */ |
| 1313 | static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf, |
| 1314 | u8 *oobbuf, int start, int nbytes, |
| 1315 | int (*iter)(struct mtd_info *, |
| 1316 | int section, |
| 1317 | struct mtd_oob_region *oobregion)) |
| 1318 | { |
Masahiro Yamada | 8e8fd4d | 2016-11-09 11:08:08 +0900 | [diff] [blame] | 1319 | struct mtd_oob_region oobregion; |
| 1320 | int section, ret; |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1321 | |
| 1322 | ret = mtd_ooblayout_find_region(mtd, start, §ion, |
| 1323 | &oobregion, iter); |
| 1324 | |
| 1325 | while (!ret) { |
| 1326 | int cnt; |
| 1327 | |
Masahiro Yamada | 7c295ef | 2016-11-09 11:08:09 +0900 | [diff] [blame] | 1328 | cnt = min_t(int, nbytes, oobregion.length); |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1329 | memcpy(oobbuf + oobregion.offset, buf, cnt); |
| 1330 | buf += cnt; |
| 1331 | nbytes -= cnt; |
| 1332 | |
| 1333 | if (!nbytes) |
| 1334 | break; |
| 1335 | |
| 1336 | ret = iter(mtd, ++section, &oobregion); |
| 1337 | } |
| 1338 | |
| 1339 | return ret; |
| 1340 | } |
| 1341 | |
| 1342 | /** |
| 1343 | * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category |
| 1344 | * @mtd: mtd info structure |
| 1345 | * @iter: category iterator |
| 1346 | * |
| 1347 | * Count the number of bytes in a given category. |
| 1348 | * |
| 1349 | * Returns a positive value on success, a negative error code otherwise. |
| 1350 | */ |
| 1351 | static int mtd_ooblayout_count_bytes(struct mtd_info *mtd, |
| 1352 | int (*iter)(struct mtd_info *, |
| 1353 | int section, |
| 1354 | struct mtd_oob_region *oobregion)) |
| 1355 | { |
Masahiro Yamada | 4d6aecf | 2016-11-09 11:08:10 +0900 | [diff] [blame] | 1356 | struct mtd_oob_region oobregion; |
Boris Brezillon | 75eb2ce | 2016-02-04 09:52:30 +0100 | [diff] [blame] | 1357 | int section = 0, ret, nbytes = 0; |
| 1358 | |
| 1359 | while (1) { |
| 1360 | ret = iter(mtd, section++, &oobregion); |
| 1361 | if (ret) { |
| 1362 | if (ret == -ERANGE) |
| 1363 | ret = nbytes; |
| 1364 | break; |
| 1365 | } |
| 1366 | |
| 1367 | nbytes += oobregion.length; |
| 1368 | } |
| 1369 | |
| 1370 | return ret; |
| 1371 | } |
| 1372 | |
| 1373 | /** |
| 1374 | * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer |
| 1375 | * @mtd: mtd info structure |
| 1376 | * @eccbuf: destination buffer to store ECC bytes |
| 1377 | * @oobbuf: OOB buffer |
| 1378 | * @start: first ECC byte to retrieve |
| 1379 | * @nbytes: number of ECC bytes to retrieve |
| 1380 | * |
| 1381 | * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes. |
| 1382 | * |
| 1383 | * Returns zero on success, a negative error code otherwise. |
| 1384 | */ |
| 1385 | int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf, |
| 1386 | const u8 *oobbuf, int start, int nbytes) |
| 1387 | { |
| 1388 | return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes, |
| 1389 | mtd_ooblayout_ecc); |
| 1390 | } |
| 1391 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes); |
| 1392 | |
| 1393 | /** |
| 1394 | * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer |
| 1395 | * @mtd: mtd info structure |
| 1396 | * @eccbuf: source buffer to get ECC bytes from |
| 1397 | * @oobbuf: OOB buffer |
| 1398 | * @start: first ECC byte to set |
| 1399 | * @nbytes: number of ECC bytes to set |
| 1400 | * |
| 1401 | * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes. |
| 1402 | * |
| 1403 | * Returns zero on success, a negative error code otherwise. |
| 1404 | */ |
| 1405 | int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf, |
| 1406 | u8 *oobbuf, int start, int nbytes) |
| 1407 | { |
| 1408 | return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes, |
| 1409 | mtd_ooblayout_ecc); |
| 1410 | } |
| 1411 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes); |
| 1412 | |
| 1413 | /** |
| 1414 | * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer |
| 1415 | * @mtd: mtd info structure |
| 1416 | * @databuf: destination buffer to store ECC bytes |
| 1417 | * @oobbuf: OOB buffer |
| 1418 | * @start: first ECC byte to retrieve |
| 1419 | * @nbytes: number of ECC bytes to retrieve |
| 1420 | * |
| 1421 | * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. |
| 1422 | * |
| 1423 | * Returns zero on success, a negative error code otherwise. |
| 1424 | */ |
| 1425 | int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf, |
| 1426 | const u8 *oobbuf, int start, int nbytes) |
| 1427 | { |
| 1428 | return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes, |
| 1429 | mtd_ooblayout_free); |
| 1430 | } |
| 1431 | EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes); |
| 1432 | |
| 1433 | /** |
| 1434 | * mtd_ooblayout_get_eccbytes - set data bytes into the oob buffer |
| 1435 | * @mtd: mtd info structure |
| 1436 | * @eccbuf: source buffer to get data bytes from |
| 1437 | * @oobbuf: OOB buffer |
| 1438 | * @start: first ECC byte to set |
| 1439 | * @nbytes: number of ECC bytes to set |
| 1440 | * |
| 1441 | * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. |
| 1442 | * |
| 1443 | * Returns zero on success, a negative error code otherwise. |
| 1444 | */ |
| 1445 | int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf, |
| 1446 | u8 *oobbuf, int start, int nbytes) |
| 1447 | { |
| 1448 | return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes, |
| 1449 | mtd_ooblayout_free); |
| 1450 | } |
| 1451 | EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes); |
| 1452 | |
| 1453 | /** |
| 1454 | * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB |
| 1455 | * @mtd: mtd info structure |
| 1456 | * |
| 1457 | * Works like mtd_ooblayout_count_bytes(), except it count free bytes. |
| 1458 | * |
| 1459 | * Returns zero on success, a negative error code otherwise. |
| 1460 | */ |
| 1461 | int mtd_ooblayout_count_freebytes(struct mtd_info *mtd) |
| 1462 | { |
| 1463 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free); |
| 1464 | } |
| 1465 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes); |
| 1466 | |
| 1467 | /** |
| 1468 | * mtd_ooblayout_count_freebytes - count the number of ECC bytes in OOB |
| 1469 | * @mtd: mtd info structure |
| 1470 | * |
| 1471 | * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes. |
| 1472 | * |
| 1473 | * Returns zero on success, a negative error code otherwise. |
| 1474 | */ |
| 1475 | int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd) |
| 1476 | { |
| 1477 | return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc); |
| 1478 | } |
| 1479 | EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes); |
| 1480 | |
Artem Bityutskiy | de3cac9 | 2012-02-08 16:37:14 +0200 | [diff] [blame] | 1481 | /* |
| 1482 | * Method to access the protection register area, present in some flash |
| 1483 | * devices. The user data is one time programmable but the factory data is read |
| 1484 | * only. |
| 1485 | */ |
Christian Riesch | 4b78fc4 | 2014-01-28 09:29:44 +0100 | [diff] [blame] | 1486 | int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
| 1487 | struct otp_info *buf) |
Artem Bityutskiy | de3cac9 | 2012-02-08 16:37:14 +0200 | [diff] [blame] | 1488 | { |
| 1489 | if (!mtd->_get_fact_prot_info) |
| 1490 | return -EOPNOTSUPP; |
| 1491 | if (!len) |
| 1492 | return 0; |
Christian Riesch | 4b78fc4 | 2014-01-28 09:29:44 +0100 | [diff] [blame] | 1493 | return mtd->_get_fact_prot_info(mtd, len, retlen, buf); |
Artem Bityutskiy | de3cac9 | 2012-02-08 16:37:14 +0200 | [diff] [blame] | 1494 | } |
| 1495 | EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info); |
| 1496 | |
| 1497 | int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, |
| 1498 | size_t *retlen, u_char *buf) |
| 1499 | { |
| 1500 | *retlen = 0; |
| 1501 | if (!mtd->_read_fact_prot_reg) |
| 1502 | return -EOPNOTSUPP; |
| 1503 | if (!len) |
| 1504 | return 0; |
| 1505 | return mtd->_read_fact_prot_reg(mtd, from, len, retlen, buf); |
| 1506 | } |
| 1507 | EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg); |
| 1508 | |
Christian Riesch | 4b78fc4 | 2014-01-28 09:29:44 +0100 | [diff] [blame] | 1509 | int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, |
| 1510 | struct otp_info *buf) |
Artem Bityutskiy | de3cac9 | 2012-02-08 16:37:14 +0200 | [diff] [blame] | 1511 | { |
| 1512 | if (!mtd->_get_user_prot_info) |
| 1513 | return -EOPNOTSUPP; |
| 1514 | if (!len) |
| 1515 | return 0; |
Christian Riesch | 4b78fc4 | 2014-01-28 09:29:44 +0100 | [diff] [blame] | 1516 | return mtd->_get_user_prot_info(mtd, len, retlen, buf); |
Artem Bityutskiy | de3cac9 | 2012-02-08 16:37:14 +0200 | [diff] [blame] | 1517 | } |
| 1518 | EXPORT_SYMBOL_GPL(mtd_get_user_prot_info); |
| 1519 | |
| 1520 | int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, |
| 1521 | size_t *retlen, u_char *buf) |
| 1522 | { |
| 1523 | *retlen = 0; |
| 1524 | if (!mtd->_read_user_prot_reg) |
| 1525 | return -EOPNOTSUPP; |
| 1526 | if (!len) |
| 1527 | return 0; |
| 1528 | return mtd->_read_user_prot_reg(mtd, from, len, retlen, buf); |
| 1529 | } |
| 1530 | EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg); |
| 1531 | |
| 1532 | int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, |
| 1533 | size_t *retlen, u_char *buf) |
| 1534 | { |
Christian Riesch | 9a78bc8 | 2014-03-06 12:42:37 +0100 | [diff] [blame] | 1535 | int ret; |
| 1536 | |
Artem Bityutskiy | de3cac9 | 2012-02-08 16:37:14 +0200 | [diff] [blame] | 1537 | *retlen = 0; |
| 1538 | if (!mtd->_write_user_prot_reg) |
| 1539 | return -EOPNOTSUPP; |
| 1540 | if (!len) |
| 1541 | return 0; |
Christian Riesch | 9a78bc8 | 2014-03-06 12:42:37 +0100 | [diff] [blame] | 1542 | ret = mtd->_write_user_prot_reg(mtd, to, len, retlen, buf); |
| 1543 | if (ret) |
| 1544 | return ret; |
| 1545 | |
| 1546 | /* |
| 1547 | * If no data could be written at all, we are out of memory and |
| 1548 | * must return -ENOSPC. |
| 1549 | */ |
| 1550 | return (*retlen) ? 0 : -ENOSPC; |
Artem Bityutskiy | de3cac9 | 2012-02-08 16:37:14 +0200 | [diff] [blame] | 1551 | } |
| 1552 | EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg); |
| 1553 | |
| 1554 | int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) |
| 1555 | { |
| 1556 | if (!mtd->_lock_user_prot_reg) |
| 1557 | return -EOPNOTSUPP; |
| 1558 | if (!len) |
| 1559 | return 0; |
| 1560 | return mtd->_lock_user_prot_reg(mtd, from, len); |
| 1561 | } |
| 1562 | EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg); |
| 1563 | |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1564 | /* Chip-supported device locking */ |
| 1565 | int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
| 1566 | { |
| 1567 | if (!mtd->_lock) |
| 1568 | return -EOPNOTSUPP; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1569 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1570 | return -EINVAL; |
Artem Bityutskiy | bcb1d23 | 2012-02-06 13:27:43 +0200 | [diff] [blame] | 1571 | if (!len) |
| 1572 | return 0; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1573 | return mtd->_lock(mtd, ofs, len); |
| 1574 | } |
| 1575 | EXPORT_SYMBOL_GPL(mtd_lock); |
| 1576 | |
| 1577 | int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
| 1578 | { |
| 1579 | if (!mtd->_unlock) |
| 1580 | return -EOPNOTSUPP; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1581 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1582 | return -EINVAL; |
Artem Bityutskiy | bcb1d23 | 2012-02-06 13:27:43 +0200 | [diff] [blame] | 1583 | if (!len) |
| 1584 | return 0; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1585 | return mtd->_unlock(mtd, ofs, len); |
| 1586 | } |
| 1587 | EXPORT_SYMBOL_GPL(mtd_unlock); |
| 1588 | |
| 1589 | int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
| 1590 | { |
| 1591 | if (!mtd->_is_locked) |
| 1592 | return -EOPNOTSUPP; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1593 | if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1594 | return -EINVAL; |
Artem Bityutskiy | bcb1d23 | 2012-02-06 13:27:43 +0200 | [diff] [blame] | 1595 | if (!len) |
| 1596 | return 0; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1597 | return mtd->_is_locked(mtd, ofs, len); |
| 1598 | } |
| 1599 | EXPORT_SYMBOL_GPL(mtd_is_locked); |
| 1600 | |
Ezequiel Garcia | 8471bb7 | 2014-05-21 19:06:12 -0300 | [diff] [blame] | 1601 | int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1602 | { |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1603 | if (ofs < 0 || ofs >= mtd->size) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1604 | return -EINVAL; |
Ezequiel Garcia | 8471bb7 | 2014-05-21 19:06:12 -0300 | [diff] [blame] | 1605 | if (!mtd->_block_isreserved) |
| 1606 | return 0; |
| 1607 | return mtd->_block_isreserved(mtd, ofs); |
| 1608 | } |
| 1609 | EXPORT_SYMBOL_GPL(mtd_block_isreserved); |
| 1610 | |
| 1611 | int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) |
| 1612 | { |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1613 | if (ofs < 0 || ofs >= mtd->size) |
Ezequiel Garcia | 8471bb7 | 2014-05-21 19:06:12 -0300 | [diff] [blame] | 1614 | return -EINVAL; |
| 1615 | if (!mtd->_block_isbad) |
| 1616 | return 0; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1617 | return mtd->_block_isbad(mtd, ofs); |
| 1618 | } |
| 1619 | EXPORT_SYMBOL_GPL(mtd_block_isbad); |
| 1620 | |
| 1621 | int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs) |
| 1622 | { |
| 1623 | if (!mtd->_block_markbad) |
| 1624 | return -EOPNOTSUPP; |
Brian Norris | 0c2b4e2 | 2014-07-21 19:06:27 -0700 | [diff] [blame] | 1625 | if (ofs < 0 || ofs >= mtd->size) |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1626 | return -EINVAL; |
Artem Bityutskiy | 664addc | 2012-02-03 18:13:23 +0200 | [diff] [blame] | 1627 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 1628 | return -EROFS; |
Artem Bityutskiy | 8273a0c | 2012-02-03 14:34:14 +0200 | [diff] [blame] | 1629 | return mtd->_block_markbad(mtd, ofs); |
| 1630 | } |
| 1631 | EXPORT_SYMBOL_GPL(mtd_block_markbad); |
| 1632 | |
| 1633 | /* |
Artem Bityutskiy | 52b0203 | 2011-12-30 15:57:25 +0200 | [diff] [blame] | 1634 | * default_mtd_writev - the default writev method |
| 1635 | * @mtd: mtd device description object pointer |
| 1636 | * @vecs: the vectors to write |
| 1637 | * @count: count of vectors in @vecs |
| 1638 | * @to: the MTD device offset to write to |
| 1639 | * @retlen: on exit contains the count of bytes written to the MTD device. |
| 1640 | * |
| 1641 | * This function returns zero in case of success and a negative error code in |
| 1642 | * case of failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | */ |
Artem Bityutskiy | 1dbebd3 | 2011-12-30 16:23:41 +0200 | [diff] [blame] | 1644 | static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, |
| 1645 | unsigned long count, loff_t to, size_t *retlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | { |
| 1647 | unsigned long i; |
| 1648 | size_t totlen = 0, thislen; |
| 1649 | int ret = 0; |
| 1650 | |
Artem Bityutskiy | 52b0203 | 2011-12-30 15:57:25 +0200 | [diff] [blame] | 1651 | for (i = 0; i < count; i++) { |
| 1652 | if (!vecs[i].iov_len) |
| 1653 | continue; |
| 1654 | ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen, |
| 1655 | vecs[i].iov_base); |
| 1656 | totlen += thislen; |
| 1657 | if (ret || thislen != vecs[i].iov_len) |
| 1658 | break; |
| 1659 | to += vecs[i].iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | } |
Artem Bityutskiy | 52b0203 | 2011-12-30 15:57:25 +0200 | [diff] [blame] | 1661 | *retlen = totlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | return ret; |
| 1663 | } |
Artem Bityutskiy | 1dbebd3 | 2011-12-30 16:23:41 +0200 | [diff] [blame] | 1664 | |
| 1665 | /* |
| 1666 | * mtd_writev - the vector-based MTD write method |
| 1667 | * @mtd: mtd device description object pointer |
| 1668 | * @vecs: the vectors to write |
| 1669 | * @count: count of vectors in @vecs |
| 1670 | * @to: the MTD device offset to write to |
| 1671 | * @retlen: on exit contains the count of bytes written to the MTD device. |
| 1672 | * |
| 1673 | * This function returns zero in case of success and a negative error code in |
| 1674 | * case of failure. |
| 1675 | */ |
| 1676 | int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, |
| 1677 | unsigned long count, loff_t to, size_t *retlen) |
| 1678 | { |
| 1679 | *retlen = 0; |
Artem Bityutskiy | 664addc | 2012-02-03 18:13:23 +0200 | [diff] [blame] | 1680 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 1681 | return -EROFS; |
Artem Bityutskiy | 3c3c10b | 2012-01-30 14:58:32 +0200 | [diff] [blame] | 1682 | if (!mtd->_writev) |
Artem Bityutskiy | 1dbebd3 | 2011-12-30 16:23:41 +0200 | [diff] [blame] | 1683 | return default_mtd_writev(mtd, vecs, count, to, retlen); |
Artem Bityutskiy | 3c3c10b | 2012-01-30 14:58:32 +0200 | [diff] [blame] | 1684 | return mtd->_writev(mtd, vecs, count, to, retlen); |
Artem Bityutskiy | 1dbebd3 | 2011-12-30 16:23:41 +0200 | [diff] [blame] | 1685 | } |
| 1686 | EXPORT_SYMBOL_GPL(mtd_writev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | |
Grant Erickson | 33b5371 | 2011-04-08 08:51:32 -0700 | [diff] [blame] | 1688 | /** |
| 1689 | * mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size |
Artem Bityutskiy | 52b0203 | 2011-12-30 15:57:25 +0200 | [diff] [blame] | 1690 | * @mtd: mtd device description object pointer |
| 1691 | * @size: a pointer to the ideal or maximum size of the allocation, points |
Grant Erickson | 33b5371 | 2011-04-08 08:51:32 -0700 | [diff] [blame] | 1692 | * to the actual allocation size on success. |
| 1693 | * |
| 1694 | * This routine attempts to allocate a contiguous kernel buffer up to |
| 1695 | * the specified size, backing off the size of the request exponentially |
| 1696 | * until the request succeeds or until the allocation size falls below |
| 1697 | * the system page size. This attempts to make sure it does not adversely |
| 1698 | * impact system performance, so when allocating more than one page, we |
Linus Torvalds | caf4919 | 2012-12-10 10:51:16 -0800 | [diff] [blame] | 1699 | * ask the memory allocator to avoid re-trying, swapping, writing back |
| 1700 | * or performing I/O. |
Grant Erickson | 33b5371 | 2011-04-08 08:51:32 -0700 | [diff] [blame] | 1701 | * |
| 1702 | * Note, this function also makes sure that the allocated buffer is aligned to |
| 1703 | * the MTD device's min. I/O unit, i.e. the "mtd->writesize" value. |
| 1704 | * |
| 1705 | * This is called, for example by mtd_{read,write} and jffs2_scan_medium, |
| 1706 | * to handle smaller (i.e. degraded) buffer allocations under low- or |
| 1707 | * fragmented-memory situations where such reduced allocations, from a |
| 1708 | * requested ideal, are allowed. |
| 1709 | * |
| 1710 | * Returns a pointer to the allocated buffer on success; otherwise, NULL. |
| 1711 | */ |
| 1712 | void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size) |
| 1713 | { |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1714 | gfp_t flags = __GFP_NOWARN | __GFP_DIRECT_RECLAIM | __GFP_NORETRY; |
Grant Erickson | 33b5371 | 2011-04-08 08:51:32 -0700 | [diff] [blame] | 1715 | size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE); |
| 1716 | void *kbuf; |
| 1717 | |
| 1718 | *size = min_t(size_t, *size, KMALLOC_MAX_SIZE); |
| 1719 | |
| 1720 | while (*size > min_alloc) { |
| 1721 | kbuf = kmalloc(*size, flags); |
| 1722 | if (kbuf) |
| 1723 | return kbuf; |
| 1724 | |
| 1725 | *size >>= 1; |
| 1726 | *size = ALIGN(*size, mtd->writesize); |
| 1727 | } |
| 1728 | |
| 1729 | /* |
| 1730 | * For the last resort allocation allow 'kmalloc()' to do all sorts of |
| 1731 | * things (write-back, dropping caches, etc) by using GFP_KERNEL. |
| 1732 | */ |
| 1733 | return kmalloc(*size, GFP_KERNEL); |
| 1734 | } |
Grant Erickson | 33b5371 | 2011-04-08 08:51:32 -0700 | [diff] [blame] | 1735 | EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | |
Pavel Machek | 2d2dce0 | 2006-03-31 02:29:49 -0800 | [diff] [blame] | 1737 | #ifdef CONFIG_PROC_FS |
| 1738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | /*====================================================================*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | /* Support for /proc/mtd */ |
| 1741 | |
Alexey Dobriyan | 447d9bd | 2011-05-13 23:34:19 +0300 | [diff] [blame] | 1742 | static int mtd_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | { |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 1744 | struct mtd_info *mtd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | |
Alexey Dobriyan | 447d9bd | 2011-05-13 23:34:19 +0300 | [diff] [blame] | 1746 | seq_puts(m, "dev: size erasesize name\n"); |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 1747 | mutex_lock(&mtd_table_mutex); |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 1748 | mtd_for_each_device(mtd) { |
Alexey Dobriyan | 447d9bd | 2011-05-13 23:34:19 +0300 | [diff] [blame] | 1749 | seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\"\n", |
| 1750 | mtd->index, (unsigned long long)mtd->size, |
| 1751 | mtd->erasesize, mtd->name); |
Wanlong Gao | d5ca512 | 2011-05-20 21:14:30 +0800 | [diff] [blame] | 1752 | } |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 1753 | mutex_unlock(&mtd_table_mutex); |
Wanlong Gao | d5ca512 | 2011-05-20 21:14:30 +0800 | [diff] [blame] | 1754 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | } |
| 1756 | |
Alexey Dobriyan | 447d9bd | 2011-05-13 23:34:19 +0300 | [diff] [blame] | 1757 | static int mtd_proc_open(struct inode *inode, struct file *file) |
| 1758 | { |
| 1759 | return single_open(file, mtd_proc_show, NULL); |
| 1760 | } |
| 1761 | |
| 1762 | static const struct file_operations mtd_proc_ops = { |
| 1763 | .open = mtd_proc_open, |
| 1764 | .read = seq_read, |
| 1765 | .llseek = seq_lseek, |
| 1766 | .release = single_release, |
| 1767 | }; |
Kevin Cernekee | 45b0907 | 2009-04-04 11:03:04 -0700 | [diff] [blame] | 1768 | #endif /* CONFIG_PROC_FS */ |
| 1769 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | /*====================================================================*/ |
| 1771 | /* Init code */ |
| 1772 | |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1773 | static struct backing_dev_info * __init mtd_bdi_init(char *name) |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1774 | { |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1775 | struct backing_dev_info *bdi; |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1776 | int ret; |
| 1777 | |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1778 | bdi = kzalloc(sizeof(*bdi), GFP_KERNEL); |
| 1779 | if (!bdi) |
| 1780 | return ERR_PTR(-ENOMEM); |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1781 | |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1782 | ret = bdi_setup_and_register(bdi, name); |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1783 | if (ret) |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1784 | kfree(bdi); |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1785 | |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1786 | return ret ? ERR_PTR(ret) : bdi; |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1787 | } |
| 1788 | |
Artem Bityutskiy | 93e5621 | 2013-03-15 12:56:05 +0200 | [diff] [blame] | 1789 | static struct proc_dir_entry *proc_mtd; |
| 1790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | static int __init init_mtd(void) |
| 1792 | { |
David Woodhouse | 15bce40 | 2009-04-05 07:40:58 -0700 | [diff] [blame] | 1793 | int ret; |
Kevin Cernekee | 694bb7f | 2009-04-03 13:00:45 -0700 | [diff] [blame] | 1794 | |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1795 | ret = class_register(&mtd_class); |
| 1796 | if (ret) |
| 1797 | goto err_reg; |
| 1798 | |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1799 | mtd_bdi = mtd_bdi_init("mtd"); |
| 1800 | if (IS_ERR(mtd_bdi)) { |
| 1801 | ret = PTR_ERR(mtd_bdi); |
Christoph Hellwig | b4caecd | 2015-01-14 10:42:32 +0100 | [diff] [blame] | 1802 | goto err_bdi; |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1803 | } |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1804 | |
Alexey Dobriyan | 447d9bd | 2011-05-13 23:34:19 +0300 | [diff] [blame] | 1805 | proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops); |
Artem Bityutskiy | 93e5621 | 2013-03-15 12:56:05 +0200 | [diff] [blame] | 1806 | |
Artem Bityutskiy | 660685d | 2013-03-14 13:27:40 +0200 | [diff] [blame] | 1807 | ret = init_mtdchar(); |
| 1808 | if (ret) |
| 1809 | goto out_procfs; |
| 1810 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | return 0; |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1812 | |
Artem Bityutskiy | 660685d | 2013-03-14 13:27:40 +0200 | [diff] [blame] | 1813 | out_procfs: |
| 1814 | if (proc_mtd) |
| 1815 | remove_proc_entry("mtd", NULL); |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1816 | bdi_destroy(mtd_bdi); |
| 1817 | kfree(mtd_bdi); |
Christoph Hellwig | b4caecd | 2015-01-14 10:42:32 +0100 | [diff] [blame] | 1818 | err_bdi: |
Jens Axboe | 0661b1a | 2010-04-27 09:49:47 +0200 | [diff] [blame] | 1819 | class_unregister(&mtd_class); |
| 1820 | err_reg: |
| 1821 | pr_err("Error registering mtd class or bdi: %d\n", ret); |
| 1822 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | } |
| 1824 | |
| 1825 | static void __exit cleanup_mtd(void) |
| 1826 | { |
Artem Bityutskiy | 660685d | 2013-03-14 13:27:40 +0200 | [diff] [blame] | 1827 | cleanup_mtdchar(); |
Wanlong Gao | d5ca512 | 2011-05-20 21:14:30 +0800 | [diff] [blame] | 1828 | if (proc_mtd) |
Artem Bityutskiy | 93e5621 | 2013-03-15 12:56:05 +0200 | [diff] [blame] | 1829 | remove_proc_entry("mtd", NULL); |
David Woodhouse | 15bce40 | 2009-04-05 07:40:58 -0700 | [diff] [blame] | 1830 | class_unregister(&mtd_class); |
Steve Longerbeam | 445caaa | 2016-08-04 19:31:15 +0530 | [diff] [blame] | 1831 | bdi_destroy(mtd_bdi); |
| 1832 | kfree(mtd_bdi); |
Johannes Thumshirn | 35667b9 | 2015-07-08 17:15:34 +0200 | [diff] [blame] | 1833 | idr_destroy(&mtd_idr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | } |
| 1835 | |
| 1836 | module_init(init_mtd); |
| 1837 | module_exit(cleanup_mtd); |
| 1838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | MODULE_LICENSE("GPL"); |
| 1840 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); |
| 1841 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |