Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * MTD device concatenation layer |
| 3 | * |
| 4 | * (C) 2002 Robert Kaiser <rkaiser@sysgo.de> |
| 5 | * |
| 6 | * NAND support by Christian Gan <cgan@iders.ca> |
| 7 | * |
| 8 | * This code is GPL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/kernel.h> |
Thomas Gleixner | 15fdc52 | 2005-11-07 00:14:42 +0100 | [diff] [blame] | 12 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/slab.h> |
Thomas Gleixner | 15fdc52 | 2005-11-07 00:14:42 +0100 | [diff] [blame] | 14 | #include <linux/sched.h> |
| 15 | #include <linux/types.h> |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 16 | #include <linux/backing-dev.h> |
Thomas Gleixner | 15fdc52 | 2005-11-07 00:14:42 +0100 | [diff] [blame] | 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/mtd/mtd.h> |
| 19 | #include <linux/mtd/concat.h> |
| 20 | |
Andrew Morton | 6c8b44a | 2006-05-20 10:17:21 +0100 | [diff] [blame] | 21 | #include <asm/div64.h> |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | /* |
| 24 | * Our storage structure: |
| 25 | * Subdev points to an array of pointers to struct mtd_info objects |
| 26 | * which is allocated along with this structure |
| 27 | * |
| 28 | */ |
| 29 | struct mtd_concat { |
| 30 | struct mtd_info mtd; |
| 31 | int num_subdev; |
| 32 | struct mtd_info **subdev; |
| 33 | }; |
| 34 | |
| 35 | /* |
| 36 | * how to calculate the size required for the above structure, |
| 37 | * including the pointer array subdev points to: |
| 38 | */ |
| 39 | #define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \ |
| 40 | ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *))) |
| 41 | |
| 42 | /* |
| 43 | * Given a pointer to the MTD object in the mtd_concat structure, |
| 44 | * we can retrieve the pointer to that structure with this macro. |
| 45 | */ |
| 46 | #define CONCAT(x) ((struct mtd_concat *)(x)) |
| 47 | |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 48 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | * MTD methods which look up the relevant subdevice, translate the |
| 50 | * effective address and pass through to the subdevice. |
| 51 | */ |
| 52 | |
| 53 | static int |
| 54 | concat_read(struct mtd_info *mtd, loff_t from, size_t len, |
| 55 | size_t * retlen, u_char * buf) |
| 56 | { |
| 57 | struct mtd_concat *concat = CONCAT(mtd); |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 58 | int ret = 0, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | int i; |
| 60 | |
| 61 | *retlen = 0; |
| 62 | |
| 63 | for (i = 0; i < concat->num_subdev; i++) { |
| 64 | struct mtd_info *subdev = concat->subdev[i]; |
| 65 | size_t size, retsize; |
| 66 | |
| 67 | if (from >= subdev->size) { |
| 68 | /* Not destined for this subdev */ |
| 69 | size = 0; |
| 70 | from -= subdev->size; |
| 71 | continue; |
| 72 | } |
| 73 | if (from + len > subdev->size) |
| 74 | /* First part goes into this subdev */ |
| 75 | size = subdev->size - from; |
| 76 | else |
| 77 | /* Entire transaction goes into this subdev */ |
| 78 | size = len; |
| 79 | |
| 80 | err = subdev->read(subdev, from, size, &retsize, buf); |
| 81 | |
Thomas Gleixner | 9a1fcdf | 2006-05-29 14:56:39 +0200 | [diff] [blame] | 82 | /* Save information about bitflips! */ |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 83 | if (unlikely(err)) { |
| 84 | if (err == -EBADMSG) { |
| 85 | mtd->ecc_stats.failed++; |
Thomas Gleixner | 9a1fcdf | 2006-05-29 14:56:39 +0200 | [diff] [blame] | 86 | ret = err; |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 87 | } else if (err == -EUCLEAN) { |
| 88 | mtd->ecc_stats.corrected++; |
| 89 | /* Do not overwrite -EBADMSG !! */ |
| 90 | if (!ret) |
| 91 | ret = err; |
| 92 | } else |
| 93 | return err; |
Thomas Gleixner | 9a1fcdf | 2006-05-29 14:56:39 +0200 | [diff] [blame] | 94 | } |
| 95 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | *retlen += retsize; |
| 97 | len -= size; |
| 98 | if (len == 0) |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 99 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | buf += size; |
| 102 | from = 0; |
| 103 | } |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 104 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | static int |
| 108 | concat_write(struct mtd_info *mtd, loff_t to, size_t len, |
| 109 | size_t * retlen, const u_char * buf) |
| 110 | { |
| 111 | struct mtd_concat *concat = CONCAT(mtd); |
| 112 | int err = -EINVAL; |
| 113 | int i; |
| 114 | |
| 115 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 116 | return -EROFS; |
| 117 | |
| 118 | *retlen = 0; |
| 119 | |
| 120 | for (i = 0; i < concat->num_subdev; i++) { |
| 121 | struct mtd_info *subdev = concat->subdev[i]; |
| 122 | size_t size, retsize; |
| 123 | |
| 124 | if (to >= subdev->size) { |
| 125 | size = 0; |
| 126 | to -= subdev->size; |
| 127 | continue; |
| 128 | } |
| 129 | if (to + len > subdev->size) |
| 130 | size = subdev->size - to; |
| 131 | else |
| 132 | size = len; |
| 133 | |
| 134 | if (!(subdev->flags & MTD_WRITEABLE)) |
| 135 | err = -EROFS; |
| 136 | else |
| 137 | err = subdev->write(subdev, to, size, &retsize, buf); |
| 138 | |
| 139 | if (err) |
| 140 | break; |
| 141 | |
| 142 | *retlen += retsize; |
| 143 | len -= size; |
| 144 | if (len == 0) |
| 145 | break; |
| 146 | |
| 147 | err = -EINVAL; |
| 148 | buf += size; |
| 149 | to = 0; |
| 150 | } |
| 151 | return err; |
| 152 | } |
| 153 | |
| 154 | static int |
Thomas Gleixner | 9d8522d | 2006-05-23 16:06:03 +0200 | [diff] [blame] | 155 | concat_writev(struct mtd_info *mtd, const struct kvec *vecs, |
| 156 | unsigned long count, loff_t to, size_t * retlen) |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 157 | { |
| 158 | struct mtd_concat *concat = CONCAT(mtd); |
| 159 | struct kvec *vecs_copy; |
| 160 | unsigned long entry_low, entry_high; |
| 161 | size_t total_len = 0; |
| 162 | int i; |
| 163 | int err = -EINVAL; |
| 164 | |
| 165 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 166 | return -EROFS; |
| 167 | |
| 168 | *retlen = 0; |
| 169 | |
| 170 | /* Calculate total length of data */ |
| 171 | for (i = 0; i < count; i++) |
| 172 | total_len += vecs[i].iov_len; |
| 173 | |
| 174 | /* Do not allow write past end of device */ |
| 175 | if ((to + total_len) > mtd->size) |
| 176 | return -EINVAL; |
| 177 | |
| 178 | /* Check alignment */ |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 179 | if (mtd->writesize > 1) { |
David Woodhouse | 0bf9733 | 2007-07-23 13:07:06 +0100 | [diff] [blame] | 180 | uint64_t __to = to; |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 181 | if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize)) |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 182 | return -EINVAL; |
Andrew Morton | 6c8b44a | 2006-05-20 10:17:21 +0100 | [diff] [blame] | 183 | } |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 184 | |
| 185 | /* make a copy of vecs */ |
| 186 | vecs_copy = kmalloc(sizeof(struct kvec) * count, GFP_KERNEL); |
| 187 | if (!vecs_copy) |
| 188 | return -ENOMEM; |
| 189 | memcpy(vecs_copy, vecs, sizeof(struct kvec) * count); |
| 190 | |
| 191 | entry_low = 0; |
| 192 | for (i = 0; i < concat->num_subdev; i++) { |
| 193 | struct mtd_info *subdev = concat->subdev[i]; |
| 194 | size_t size, wsize, retsize, old_iov_len; |
| 195 | |
| 196 | if (to >= subdev->size) { |
| 197 | to -= subdev->size; |
| 198 | continue; |
| 199 | } |
| 200 | |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 201 | size = min_t(uint64_t, total_len, subdev->size - to); |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 202 | wsize = size; /* store for future use */ |
| 203 | |
| 204 | entry_high = entry_low; |
| 205 | while (entry_high < count) { |
| 206 | if (size <= vecs_copy[entry_high].iov_len) |
| 207 | break; |
| 208 | size -= vecs_copy[entry_high++].iov_len; |
| 209 | } |
| 210 | |
| 211 | old_iov_len = vecs_copy[entry_high].iov_len; |
| 212 | vecs_copy[entry_high].iov_len = size; |
| 213 | |
| 214 | if (!(subdev->flags & MTD_WRITEABLE)) |
| 215 | err = -EROFS; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 216 | else |
| 217 | err = subdev->writev(subdev, &vecs_copy[entry_low], |
| 218 | entry_high - entry_low + 1, to, &retsize); |
| 219 | |
| 220 | vecs_copy[entry_high].iov_len = old_iov_len - size; |
| 221 | vecs_copy[entry_high].iov_base += size; |
| 222 | |
| 223 | entry_low = entry_high; |
| 224 | |
| 225 | if (err) |
| 226 | break; |
| 227 | |
| 228 | *retlen += retsize; |
| 229 | total_len -= wsize; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 230 | |
| 231 | if (total_len == 0) |
| 232 | break; |
| 233 | |
| 234 | err = -EINVAL; |
| 235 | to = 0; |
| 236 | } |
| 237 | |
| 238 | kfree(vecs_copy); |
| 239 | return err; |
| 240 | } |
| 241 | |
| 242 | static int |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 243 | concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | { |
| 245 | struct mtd_concat *concat = CONCAT(mtd); |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 246 | struct mtd_oob_ops devops = *ops; |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 247 | int i, err, ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 249 | ops->retlen = ops->oobretlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | for (i = 0; i < concat->num_subdev; i++) { |
| 252 | struct mtd_info *subdev = concat->subdev[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | if (from >= subdev->size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | from -= subdev->size; |
| 256 | continue; |
| 257 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 259 | /* partial read ? */ |
| 260 | if (from + devops.len > subdev->size) |
| 261 | devops.len = subdev->size - from; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 263 | err = subdev->read_oob(subdev, from, &devops); |
| 264 | ops->retlen += devops.retlen; |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 265 | ops->oobretlen += devops.oobretlen; |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 266 | |
| 267 | /* Save information about bitflips! */ |
| 268 | if (unlikely(err)) { |
| 269 | if (err == -EBADMSG) { |
| 270 | mtd->ecc_stats.failed++; |
| 271 | ret = err; |
| 272 | } else if (err == -EUCLEAN) { |
| 273 | mtd->ecc_stats.corrected++; |
| 274 | /* Do not overwrite -EBADMSG !! */ |
| 275 | if (!ret) |
| 276 | ret = err; |
| 277 | } else |
| 278 | return err; |
| 279 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 281 | if (devops.datbuf) { |
| 282 | devops.len = ops->len - ops->retlen; |
| 283 | if (!devops.len) |
| 284 | return ret; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 285 | devops.datbuf += devops.retlen; |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 286 | } |
| 287 | if (devops.oobbuf) { |
| 288 | devops.ooblen = ops->ooblen - ops->oobretlen; |
| 289 | if (!devops.ooblen) |
| 290 | return ret; |
| 291 | devops.oobbuf += ops->oobretlen; |
| 292 | } |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | from = 0; |
| 295 | } |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 296 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | static int |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 300 | concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | { |
| 302 | struct mtd_concat *concat = CONCAT(mtd); |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 303 | struct mtd_oob_ops devops = *ops; |
| 304 | int i, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 307 | return -EROFS; |
| 308 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 309 | ops->retlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
| 311 | for (i = 0; i < concat->num_subdev; i++) { |
| 312 | struct mtd_info *subdev = concat->subdev[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | if (to >= subdev->size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | to -= subdev->size; |
| 316 | continue; |
| 317 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 319 | /* partial write ? */ |
| 320 | if (to + devops.len > subdev->size) |
| 321 | devops.len = subdev->size - to; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 323 | err = subdev->write_oob(subdev, to, &devops); |
| 324 | ops->retlen += devops.retlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | if (err) |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 326 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 328 | if (devops.datbuf) { |
| 329 | devops.len = ops->len - ops->retlen; |
| 330 | if (!devops.len) |
| 331 | return 0; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 332 | devops.datbuf += devops.retlen; |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 333 | } |
| 334 | if (devops.oobbuf) { |
| 335 | devops.ooblen = ops->ooblen - ops->oobretlen; |
| 336 | if (!devops.ooblen) |
| 337 | return 0; |
| 338 | devops.oobbuf += devops.oobretlen; |
| 339 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | to = 0; |
| 341 | } |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 342 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | static void concat_erase_callback(struct erase_info *instr) |
| 346 | { |
| 347 | wake_up((wait_queue_head_t *) instr->priv); |
| 348 | } |
| 349 | |
| 350 | static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase) |
| 351 | { |
| 352 | int err; |
| 353 | wait_queue_head_t waitq; |
| 354 | DECLARE_WAITQUEUE(wait, current); |
| 355 | |
| 356 | /* |
| 357 | * This code was stol^H^H^H^Hinspired by mtdchar.c |
| 358 | */ |
| 359 | init_waitqueue_head(&waitq); |
| 360 | |
| 361 | erase->mtd = mtd; |
| 362 | erase->callback = concat_erase_callback; |
| 363 | erase->priv = (unsigned long) &waitq; |
| 364 | |
| 365 | /* |
| 366 | * FIXME: Allow INTERRUPTIBLE. Which means |
| 367 | * not having the wait_queue head on the stack. |
| 368 | */ |
| 369 | err = mtd->erase(mtd, erase); |
| 370 | if (!err) { |
| 371 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 372 | add_wait_queue(&waitq, &wait); |
| 373 | if (erase->state != MTD_ERASE_DONE |
| 374 | && erase->state != MTD_ERASE_FAILED) |
| 375 | schedule(); |
| 376 | remove_wait_queue(&waitq, &wait); |
| 377 | set_current_state(TASK_RUNNING); |
| 378 | |
| 379 | err = (erase->state == MTD_ERASE_FAILED) ? -EIO : 0; |
| 380 | } |
| 381 | return err; |
| 382 | } |
| 383 | |
| 384 | static int concat_erase(struct mtd_info *mtd, struct erase_info *instr) |
| 385 | { |
| 386 | struct mtd_concat *concat = CONCAT(mtd); |
| 387 | struct mtd_info *subdev; |
| 388 | int i, err; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 389 | uint64_t length, offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | struct erase_info *erase; |
| 391 | |
| 392 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 393 | return -EROFS; |
| 394 | |
| 395 | if (instr->addr > concat->mtd.size) |
| 396 | return -EINVAL; |
| 397 | |
| 398 | if (instr->len + instr->addr > concat->mtd.size) |
| 399 | return -EINVAL; |
| 400 | |
| 401 | /* |
| 402 | * Check for proper erase block alignment of the to-be-erased area. |
| 403 | * It is easier to do this based on the super device's erase |
| 404 | * region info rather than looking at each particular sub-device |
| 405 | * in turn. |
| 406 | */ |
| 407 | if (!concat->mtd.numeraseregions) { |
| 408 | /* the easy case: device has uniform erase block size */ |
| 409 | if (instr->addr & (concat->mtd.erasesize - 1)) |
| 410 | return -EINVAL; |
| 411 | if (instr->len & (concat->mtd.erasesize - 1)) |
| 412 | return -EINVAL; |
| 413 | } else { |
| 414 | /* device has variable erase size */ |
| 415 | struct mtd_erase_region_info *erase_regions = |
| 416 | concat->mtd.eraseregions; |
| 417 | |
| 418 | /* |
| 419 | * Find the erase region where the to-be-erased area begins: |
| 420 | */ |
| 421 | for (i = 0; i < concat->mtd.numeraseregions && |
| 422 | instr->addr >= erase_regions[i].offset; i++) ; |
| 423 | --i; |
| 424 | |
| 425 | /* |
| 426 | * Now erase_regions[i] is the region in which the |
| 427 | * to-be-erased area begins. Verify that the starting |
| 428 | * offset is aligned to this region's erase size: |
| 429 | */ |
| 430 | if (instr->addr & (erase_regions[i].erasesize - 1)) |
| 431 | return -EINVAL; |
| 432 | |
| 433 | /* |
| 434 | * now find the erase region where the to-be-erased area ends: |
| 435 | */ |
| 436 | for (; i < concat->mtd.numeraseregions && |
| 437 | (instr->addr + instr->len) >= erase_regions[i].offset; |
| 438 | ++i) ; |
| 439 | --i; |
| 440 | /* |
| 441 | * check if the ending offset is aligned to this region's erase size |
| 442 | */ |
| 443 | if ((instr->addr + instr->len) & (erase_regions[i].erasesize - |
| 444 | 1)) |
| 445 | return -EINVAL; |
| 446 | } |
| 447 | |
Adrian Hunter | bb0eb217 | 2008-08-12 12:40:50 +0300 | [diff] [blame] | 448 | instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
| 450 | /* make a local copy of instr to avoid modifying the caller's struct */ |
| 451 | erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL); |
| 452 | |
| 453 | if (!erase) |
| 454 | return -ENOMEM; |
| 455 | |
| 456 | *erase = *instr; |
| 457 | length = instr->len; |
| 458 | |
| 459 | /* |
| 460 | * find the subdevice where the to-be-erased area begins, adjust |
| 461 | * starting offset to be relative to the subdevice start |
| 462 | */ |
| 463 | for (i = 0; i < concat->num_subdev; i++) { |
| 464 | subdev = concat->subdev[i]; |
| 465 | if (subdev->size <= erase->addr) { |
| 466 | erase->addr -= subdev->size; |
| 467 | offset += subdev->size; |
| 468 | } else { |
| 469 | break; |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | /* must never happen since size limit has been verified above */ |
Eric Sesterhenn | 373ebfb | 2006-03-26 18:15:12 +0200 | [diff] [blame] | 474 | BUG_ON(i >= concat->num_subdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
| 476 | /* now do the erase: */ |
| 477 | err = 0; |
| 478 | for (; length > 0; i++) { |
| 479 | /* loop for all subdevices affected by this request */ |
| 480 | subdev = concat->subdev[i]; /* get current subdevice */ |
| 481 | |
| 482 | /* limit length to subdevice's size: */ |
| 483 | if (erase->addr + length > subdev->size) |
| 484 | erase->len = subdev->size - erase->addr; |
| 485 | else |
| 486 | erase->len = length; |
| 487 | |
| 488 | if (!(subdev->flags & MTD_WRITEABLE)) { |
| 489 | err = -EROFS; |
| 490 | break; |
| 491 | } |
| 492 | length -= erase->len; |
| 493 | if ((err = concat_dev_erase(subdev, erase))) { |
| 494 | /* sanity check: should never happen since |
| 495 | * block alignment has been checked above */ |
Eric Sesterhenn | 373ebfb | 2006-03-26 18:15:12 +0200 | [diff] [blame] | 496 | BUG_ON(err == -EINVAL); |
Adrian Hunter | bb0eb217 | 2008-08-12 12:40:50 +0300 | [diff] [blame] | 497 | if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | instr->fail_addr = erase->fail_addr + offset; |
| 499 | break; |
| 500 | } |
| 501 | /* |
| 502 | * erase->addr specifies the offset of the area to be |
| 503 | * erased *within the current subdevice*. It can be |
| 504 | * non-zero only the first time through this loop, i.e. |
| 505 | * for the first subdevice where blocks need to be erased. |
| 506 | * All the following erases must begin at the start of the |
| 507 | * current subdevice, i.e. at offset zero. |
| 508 | */ |
| 509 | erase->addr = 0; |
| 510 | offset += subdev->size; |
| 511 | } |
| 512 | instr->state = erase->state; |
| 513 | kfree(erase); |
| 514 | if (err) |
| 515 | return err; |
| 516 | |
| 517 | if (instr->callback) |
| 518 | instr->callback(instr); |
| 519 | return 0; |
| 520 | } |
| 521 | |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 522 | static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | { |
| 524 | struct mtd_concat *concat = CONCAT(mtd); |
| 525 | int i, err = -EINVAL; |
| 526 | |
| 527 | if ((len + ofs) > mtd->size) |
| 528 | return -EINVAL; |
| 529 | |
| 530 | for (i = 0; i < concat->num_subdev; i++) { |
| 531 | struct mtd_info *subdev = concat->subdev[i]; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 532 | uint64_t size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
| 534 | if (ofs >= subdev->size) { |
| 535 | size = 0; |
| 536 | ofs -= subdev->size; |
| 537 | continue; |
| 538 | } |
| 539 | if (ofs + len > subdev->size) |
| 540 | size = subdev->size - ofs; |
| 541 | else |
| 542 | size = len; |
| 543 | |
| 544 | err = subdev->lock(subdev, ofs, size); |
| 545 | |
| 546 | if (err) |
| 547 | break; |
| 548 | |
| 549 | len -= size; |
| 550 | if (len == 0) |
| 551 | break; |
| 552 | |
| 553 | err = -EINVAL; |
| 554 | ofs = 0; |
| 555 | } |
| 556 | |
| 557 | return err; |
| 558 | } |
| 559 | |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 560 | static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | { |
| 562 | struct mtd_concat *concat = CONCAT(mtd); |
| 563 | int i, err = 0; |
| 564 | |
| 565 | if ((len + ofs) > mtd->size) |
| 566 | return -EINVAL; |
| 567 | |
| 568 | for (i = 0; i < concat->num_subdev; i++) { |
| 569 | struct mtd_info *subdev = concat->subdev[i]; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 570 | uint64_t size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | |
| 572 | if (ofs >= subdev->size) { |
| 573 | size = 0; |
| 574 | ofs -= subdev->size; |
| 575 | continue; |
| 576 | } |
| 577 | if (ofs + len > subdev->size) |
| 578 | size = subdev->size - ofs; |
| 579 | else |
| 580 | size = len; |
| 581 | |
| 582 | err = subdev->unlock(subdev, ofs, size); |
| 583 | |
| 584 | if (err) |
| 585 | break; |
| 586 | |
| 587 | len -= size; |
| 588 | if (len == 0) |
| 589 | break; |
| 590 | |
| 591 | err = -EINVAL; |
| 592 | ofs = 0; |
| 593 | } |
| 594 | |
| 595 | return err; |
| 596 | } |
| 597 | |
| 598 | static void concat_sync(struct mtd_info *mtd) |
| 599 | { |
| 600 | struct mtd_concat *concat = CONCAT(mtd); |
| 601 | int i; |
| 602 | |
| 603 | for (i = 0; i < concat->num_subdev; i++) { |
| 604 | struct mtd_info *subdev = concat->subdev[i]; |
| 605 | subdev->sync(subdev); |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | static int concat_suspend(struct mtd_info *mtd) |
| 610 | { |
| 611 | struct mtd_concat *concat = CONCAT(mtd); |
| 612 | int i, rc = 0; |
| 613 | |
| 614 | for (i = 0; i < concat->num_subdev; i++) { |
| 615 | struct mtd_info *subdev = concat->subdev[i]; |
| 616 | if ((rc = subdev->suspend(subdev)) < 0) |
| 617 | return rc; |
| 618 | } |
| 619 | return rc; |
| 620 | } |
| 621 | |
| 622 | static void concat_resume(struct mtd_info *mtd) |
| 623 | { |
| 624 | struct mtd_concat *concat = CONCAT(mtd); |
| 625 | int i; |
| 626 | |
| 627 | for (i = 0; i < concat->num_subdev; i++) { |
| 628 | struct mtd_info *subdev = concat->subdev[i]; |
| 629 | subdev->resume(subdev); |
| 630 | } |
| 631 | } |
| 632 | |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 633 | static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs) |
| 634 | { |
| 635 | struct mtd_concat *concat = CONCAT(mtd); |
| 636 | int i, res = 0; |
| 637 | |
| 638 | if (!concat->subdev[0]->block_isbad) |
| 639 | return res; |
| 640 | |
| 641 | if (ofs > mtd->size) |
| 642 | return -EINVAL; |
| 643 | |
| 644 | for (i = 0; i < concat->num_subdev; i++) { |
| 645 | struct mtd_info *subdev = concat->subdev[i]; |
| 646 | |
| 647 | if (ofs >= subdev->size) { |
| 648 | ofs -= subdev->size; |
| 649 | continue; |
| 650 | } |
| 651 | |
| 652 | res = subdev->block_isbad(subdev, ofs); |
| 653 | break; |
| 654 | } |
| 655 | |
| 656 | return res; |
| 657 | } |
| 658 | |
| 659 | static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs) |
| 660 | { |
| 661 | struct mtd_concat *concat = CONCAT(mtd); |
| 662 | int i, err = -EINVAL; |
| 663 | |
| 664 | if (!concat->subdev[0]->block_markbad) |
| 665 | return 0; |
| 666 | |
| 667 | if (ofs > mtd->size) |
| 668 | return -EINVAL; |
| 669 | |
| 670 | for (i = 0; i < concat->num_subdev; i++) { |
| 671 | struct mtd_info *subdev = concat->subdev[i]; |
| 672 | |
| 673 | if (ofs >= subdev->size) { |
| 674 | ofs -= subdev->size; |
| 675 | continue; |
| 676 | } |
| 677 | |
| 678 | err = subdev->block_markbad(subdev, ofs); |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 679 | if (!err) |
| 680 | mtd->ecc_stats.badblocks++; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 681 | break; |
| 682 | } |
| 683 | |
| 684 | return err; |
| 685 | } |
| 686 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | /* |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 688 | * try to support NOMMU mmaps on concatenated devices |
| 689 | * - we don't support subdev spanning as we can't guarantee it'll work |
| 690 | */ |
| 691 | static unsigned long concat_get_unmapped_area(struct mtd_info *mtd, |
| 692 | unsigned long len, |
| 693 | unsigned long offset, |
| 694 | unsigned long flags) |
| 695 | { |
| 696 | struct mtd_concat *concat = CONCAT(mtd); |
| 697 | int i; |
| 698 | |
| 699 | for (i = 0; i < concat->num_subdev; i++) { |
| 700 | struct mtd_info *subdev = concat->subdev[i]; |
| 701 | |
| 702 | if (offset >= subdev->size) { |
| 703 | offset -= subdev->size; |
| 704 | continue; |
| 705 | } |
| 706 | |
| 707 | /* we've found the subdev over which the mapping will reside */ |
| 708 | if (offset + len > subdev->size) |
| 709 | return (unsigned long) -EINVAL; |
| 710 | |
| 711 | if (subdev->get_unmapped_area) |
| 712 | return subdev->get_unmapped_area(subdev, len, offset, |
| 713 | flags); |
| 714 | |
| 715 | break; |
| 716 | } |
| 717 | |
| 718 | return (unsigned long) -ENOSYS; |
| 719 | } |
| 720 | |
| 721 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | * This function constructs a virtual MTD device by concatenating |
| 723 | * num_devs MTD devices. A pointer to the new device object is |
| 724 | * stored to *new_dev upon success. This function does _not_ |
| 725 | * register any devices: this is the caller's responsibility. |
| 726 | */ |
| 727 | struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */ |
| 728 | int num_devs, /* number of subdevices */ |
Kay Sievers | 160bbab | 2008-12-23 10:00:14 +0000 | [diff] [blame] | 729 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | { /* name for the new device */ |
| 731 | int i; |
| 732 | size_t size; |
| 733 | struct mtd_concat *concat; |
David Woodhouse | 26cdb67 | 2008-12-10 14:08:12 +0000 | [diff] [blame] | 734 | uint32_t max_erasesize, curr_erasesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | int num_erase_region; |
| 736 | |
| 737 | printk(KERN_NOTICE "Concatenating MTD devices:\n"); |
| 738 | for (i = 0; i < num_devs; i++) |
| 739 | printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name); |
| 740 | printk(KERN_NOTICE "into device \"%s\"\n", name); |
| 741 | |
| 742 | /* allocate the device structure */ |
| 743 | size = SIZEOF_STRUCT_MTD_CONCAT(num_devs); |
Burman Yan | 95b93a0 | 2006-11-15 21:10:29 +0200 | [diff] [blame] | 744 | concat = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | if (!concat) { |
| 746 | printk |
| 747 | ("memory allocation error while creating concatenated device \"%s\"\n", |
| 748 | name); |
| 749 | return NULL; |
| 750 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | concat->subdev = (struct mtd_info **) (concat + 1); |
| 752 | |
| 753 | /* |
| 754 | * Set up the new "super" device's MTD object structure, check for |
| 755 | * incompatibilites between the subdevices. |
| 756 | */ |
| 757 | concat->mtd.type = subdev[0]->type; |
| 758 | concat->mtd.flags = subdev[0]->flags; |
| 759 | concat->mtd.size = subdev[0]->size; |
| 760 | concat->mtd.erasesize = subdev[0]->erasesize; |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 761 | concat->mtd.writesize = subdev[0]->writesize; |
Chris Paulson-Ellis | a2e1b83 | 2007-10-12 10:54:06 +0100 | [diff] [blame] | 762 | concat->mtd.subpage_sft = subdev[0]->subpage_sft; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | concat->mtd.oobsize = subdev[0]->oobsize; |
Vitaly Wool | 1f92267 | 2007-03-06 16:56:34 +0300 | [diff] [blame] | 764 | concat->mtd.oobavail = subdev[0]->oobavail; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 765 | if (subdev[0]->writev) |
| 766 | concat->mtd.writev = concat_writev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | if (subdev[0]->read_oob) |
| 768 | concat->mtd.read_oob = concat_read_oob; |
| 769 | if (subdev[0]->write_oob) |
| 770 | concat->mtd.write_oob = concat_write_oob; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 771 | if (subdev[0]->block_isbad) |
| 772 | concat->mtd.block_isbad = concat_block_isbad; |
| 773 | if (subdev[0]->block_markbad) |
| 774 | concat->mtd.block_markbad = concat_block_markbad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 776 | concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks; |
| 777 | |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 778 | concat->mtd.backing_dev_info = subdev[0]->backing_dev_info; |
| 779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | concat->subdev[0] = subdev[0]; |
| 781 | |
| 782 | for (i = 1; i < num_devs; i++) { |
| 783 | if (concat->mtd.type != subdev[i]->type) { |
| 784 | kfree(concat); |
| 785 | printk("Incompatible device type on \"%s\"\n", |
| 786 | subdev[i]->name); |
| 787 | return NULL; |
| 788 | } |
| 789 | if (concat->mtd.flags != subdev[i]->flags) { |
| 790 | /* |
| 791 | * Expect all flags except MTD_WRITEABLE to be |
| 792 | * equal on all subdevices. |
| 793 | */ |
| 794 | if ((concat->mtd.flags ^ subdev[i]-> |
| 795 | flags) & ~MTD_WRITEABLE) { |
| 796 | kfree(concat); |
| 797 | printk("Incompatible device flags on \"%s\"\n", |
| 798 | subdev[i]->name); |
| 799 | return NULL; |
| 800 | } else |
| 801 | /* if writeable attribute differs, |
| 802 | make super device writeable */ |
| 803 | concat->mtd.flags |= |
| 804 | subdev[i]->flags & MTD_WRITEABLE; |
| 805 | } |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 806 | |
| 807 | /* only permit direct mapping if the BDIs are all the same |
| 808 | * - copy-mapping is still permitted |
| 809 | */ |
| 810 | if (concat->mtd.backing_dev_info != |
| 811 | subdev[i]->backing_dev_info) |
| 812 | concat->mtd.backing_dev_info = |
| 813 | &default_backing_dev_info; |
| 814 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | concat->mtd.size += subdev[i]->size; |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 816 | concat->mtd.ecc_stats.badblocks += |
| 817 | subdev[i]->ecc_stats.badblocks; |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 818 | if (concat->mtd.writesize != subdev[i]->writesize || |
Thomas Gleixner | 29072b9 | 2006-09-28 15:38:36 +0200 | [diff] [blame] | 819 | concat->mtd.subpage_sft != subdev[i]->subpage_sft || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | concat->mtd.oobsize != subdev[i]->oobsize || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | !concat->mtd.read_oob != !subdev[i]->read_oob || |
| 822 | !concat->mtd.write_oob != !subdev[i]->write_oob) { |
| 823 | kfree(concat); |
| 824 | printk("Incompatible OOB or ECC data on \"%s\"\n", |
| 825 | subdev[i]->name); |
| 826 | return NULL; |
| 827 | } |
| 828 | concat->subdev[i] = subdev[i]; |
| 829 | |
| 830 | } |
| 831 | |
Thomas Gleixner | 5bd34c0 | 2006-05-27 22:16:10 +0200 | [diff] [blame] | 832 | concat->mtd.ecclayout = subdev[0]->ecclayout; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | concat->num_subdev = num_devs; |
| 835 | concat->mtd.name = name; |
| 836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | concat->mtd.erase = concat_erase; |
| 838 | concat->mtd.read = concat_read; |
| 839 | concat->mtd.write = concat_write; |
| 840 | concat->mtd.sync = concat_sync; |
| 841 | concat->mtd.lock = concat_lock; |
| 842 | concat->mtd.unlock = concat_unlock; |
| 843 | concat->mtd.suspend = concat_suspend; |
| 844 | concat->mtd.resume = concat_resume; |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 845 | concat->mtd.get_unmapped_area = concat_get_unmapped_area; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | |
| 847 | /* |
| 848 | * Combine the erase block size info of the subdevices: |
| 849 | * |
| 850 | * first, walk the map of the new device and see how |
| 851 | * many changes in erase size we have |
| 852 | */ |
| 853 | max_erasesize = curr_erasesize = subdev[0]->erasesize; |
| 854 | num_erase_region = 1; |
| 855 | for (i = 0; i < num_devs; i++) { |
| 856 | if (subdev[i]->numeraseregions == 0) { |
| 857 | /* current subdevice has uniform erase size */ |
| 858 | if (subdev[i]->erasesize != curr_erasesize) { |
| 859 | /* if it differs from the last subdevice's erase size, count it */ |
| 860 | ++num_erase_region; |
| 861 | curr_erasesize = subdev[i]->erasesize; |
| 862 | if (curr_erasesize > max_erasesize) |
| 863 | max_erasesize = curr_erasesize; |
| 864 | } |
| 865 | } else { |
| 866 | /* current subdevice has variable erase size */ |
| 867 | int j; |
| 868 | for (j = 0; j < subdev[i]->numeraseregions; j++) { |
| 869 | |
| 870 | /* walk the list of erase regions, count any changes */ |
| 871 | if (subdev[i]->eraseregions[j].erasesize != |
| 872 | curr_erasesize) { |
| 873 | ++num_erase_region; |
| 874 | curr_erasesize = |
| 875 | subdev[i]->eraseregions[j]. |
| 876 | erasesize; |
| 877 | if (curr_erasesize > max_erasesize) |
| 878 | max_erasesize = curr_erasesize; |
| 879 | } |
| 880 | } |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | if (num_erase_region == 1) { |
| 885 | /* |
| 886 | * All subdevices have the same uniform erase size. |
| 887 | * This is easy: |
| 888 | */ |
| 889 | concat->mtd.erasesize = curr_erasesize; |
| 890 | concat->mtd.numeraseregions = 0; |
| 891 | } else { |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 892 | uint64_t tmp64; |
| 893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | /* |
| 895 | * erase block size varies across the subdevices: allocate |
| 896 | * space to store the data describing the variable erase regions |
| 897 | */ |
| 898 | struct mtd_erase_region_info *erase_region_p; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 899 | uint64_t begin, position; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
| 901 | concat->mtd.erasesize = max_erasesize; |
| 902 | concat->mtd.numeraseregions = num_erase_region; |
| 903 | concat->mtd.eraseregions = erase_region_p = |
| 904 | kmalloc(num_erase_region * |
| 905 | sizeof (struct mtd_erase_region_info), GFP_KERNEL); |
| 906 | if (!erase_region_p) { |
| 907 | kfree(concat); |
| 908 | printk |
| 909 | ("memory allocation error while creating erase region list" |
| 910 | " for device \"%s\"\n", name); |
| 911 | return NULL; |
| 912 | } |
| 913 | |
| 914 | /* |
| 915 | * walk the map of the new device once more and fill in |
| 916 | * in erase region info: |
| 917 | */ |
| 918 | curr_erasesize = subdev[0]->erasesize; |
| 919 | begin = position = 0; |
| 920 | for (i = 0; i < num_devs; i++) { |
| 921 | if (subdev[i]->numeraseregions == 0) { |
| 922 | /* current subdevice has uniform erase size */ |
| 923 | if (subdev[i]->erasesize != curr_erasesize) { |
| 924 | /* |
| 925 | * fill in an mtd_erase_region_info structure for the area |
| 926 | * we have walked so far: |
| 927 | */ |
| 928 | erase_region_p->offset = begin; |
| 929 | erase_region_p->erasesize = |
| 930 | curr_erasesize; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 931 | tmp64 = position - begin; |
| 932 | do_div(tmp64, curr_erasesize); |
| 933 | erase_region_p->numblocks = tmp64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | begin = position; |
| 935 | |
| 936 | curr_erasesize = subdev[i]->erasesize; |
| 937 | ++erase_region_p; |
| 938 | } |
| 939 | position += subdev[i]->size; |
| 940 | } else { |
| 941 | /* current subdevice has variable erase size */ |
| 942 | int j; |
| 943 | for (j = 0; j < subdev[i]->numeraseregions; j++) { |
| 944 | /* walk the list of erase regions, count any changes */ |
| 945 | if (subdev[i]->eraseregions[j]. |
| 946 | erasesize != curr_erasesize) { |
| 947 | erase_region_p->offset = begin; |
| 948 | erase_region_p->erasesize = |
| 949 | curr_erasesize; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 950 | tmp64 = position - begin; |
| 951 | do_div(tmp64, curr_erasesize); |
| 952 | erase_region_p->numblocks = tmp64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | begin = position; |
| 954 | |
| 955 | curr_erasesize = |
| 956 | subdev[i]->eraseregions[j]. |
| 957 | erasesize; |
| 958 | ++erase_region_p; |
| 959 | } |
| 960 | position += |
| 961 | subdev[i]->eraseregions[j]. |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 962 | numblocks * (uint64_t)curr_erasesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | } |
| 964 | } |
| 965 | } |
| 966 | /* Now write the final entry */ |
| 967 | erase_region_p->offset = begin; |
| 968 | erase_region_p->erasesize = curr_erasesize; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 969 | tmp64 = position - begin; |
| 970 | do_div(tmp64, curr_erasesize); |
| 971 | erase_region_p->numblocks = tmp64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | return &concat->mtd; |
| 975 | } |
| 976 | |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 977 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | * This function destroys an MTD object obtained from concat_mtd_devs() |
| 979 | */ |
| 980 | |
| 981 | void mtd_concat_destroy(struct mtd_info *mtd) |
| 982 | { |
| 983 | struct mtd_concat *concat = CONCAT(mtd); |
| 984 | if (concat->mtd.numeraseregions) |
| 985 | kfree(concat->mtd.eraseregions); |
| 986 | kfree(concat); |
| 987 | } |
| 988 | |
| 989 | EXPORT_SYMBOL(mtd_concat_create); |
| 990 | EXPORT_SYMBOL(mtd_concat_destroy); |
| 991 | |
| 992 | MODULE_LICENSE("GPL"); |
| 993 | MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>"); |
| 994 | MODULE_DESCRIPTION("Generic support for concatenating of MTD devices"); |