Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * MTD device concatenation layer |
| 3 | * |
David Woodhouse | a1452a3 | 2010-08-08 20:58:20 +0100 | [diff] [blame] | 4 | * Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de> |
| 5 | * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * NAND support by Christian Gan <cgan@iders.ca> |
| 8 | * |
David Woodhouse | a1452a3 | 2010-08-08 20:58:20 +0100 | [diff] [blame] | 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | */ |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/kernel.h> |
Thomas Gleixner | 15fdc52 | 2005-11-07 00:14:42 +0100 | [diff] [blame] | 26 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/slab.h> |
Thomas Gleixner | 15fdc52 | 2005-11-07 00:14:42 +0100 | [diff] [blame] | 28 | #include <linux/sched.h> |
| 29 | #include <linux/types.h> |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 30 | #include <linux/backing-dev.h> |
Thomas Gleixner | 15fdc52 | 2005-11-07 00:14:42 +0100 | [diff] [blame] | 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/mtd/mtd.h> |
| 33 | #include <linux/mtd/concat.h> |
| 34 | |
Andrew Morton | 6c8b44a | 2006-05-20 10:17:21 +0100 | [diff] [blame] | 35 | #include <asm/div64.h> |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | /* |
| 38 | * Our storage structure: |
| 39 | * Subdev points to an array of pointers to struct mtd_info objects |
| 40 | * which is allocated along with this structure |
| 41 | * |
| 42 | */ |
| 43 | struct mtd_concat { |
| 44 | struct mtd_info mtd; |
| 45 | int num_subdev; |
| 46 | struct mtd_info **subdev; |
| 47 | }; |
| 48 | |
| 49 | /* |
| 50 | * how to calculate the size required for the above structure, |
| 51 | * including the pointer array subdev points to: |
| 52 | */ |
| 53 | #define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \ |
| 54 | ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *))) |
| 55 | |
| 56 | /* |
| 57 | * Given a pointer to the MTD object in the mtd_concat structure, |
| 58 | * we can retrieve the pointer to that structure with this macro. |
| 59 | */ |
| 60 | #define CONCAT(x) ((struct mtd_concat *)(x)) |
| 61 | |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 62 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | * MTD methods which look up the relevant subdevice, translate the |
| 64 | * effective address and pass through to the subdevice. |
| 65 | */ |
| 66 | |
| 67 | static int |
| 68 | concat_read(struct mtd_info *mtd, loff_t from, size_t len, |
| 69 | size_t * retlen, u_char * buf) |
| 70 | { |
| 71 | struct mtd_concat *concat = CONCAT(mtd); |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 72 | int ret = 0, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | int i; |
| 74 | |
| 75 | *retlen = 0; |
| 76 | |
| 77 | for (i = 0; i < concat->num_subdev; i++) { |
| 78 | struct mtd_info *subdev = concat->subdev[i]; |
| 79 | size_t size, retsize; |
| 80 | |
| 81 | if (from >= subdev->size) { |
| 82 | /* Not destined for this subdev */ |
| 83 | size = 0; |
| 84 | from -= subdev->size; |
| 85 | continue; |
| 86 | } |
| 87 | if (from + len > subdev->size) |
| 88 | /* First part goes into this subdev */ |
| 89 | size = subdev->size - from; |
| 90 | else |
| 91 | /* Entire transaction goes into this subdev */ |
| 92 | size = len; |
| 93 | |
| 94 | err = subdev->read(subdev, from, size, &retsize, buf); |
| 95 | |
Thomas Gleixner | 9a1fcdf | 2006-05-29 14:56:39 +0200 | [diff] [blame] | 96 | /* Save information about bitflips! */ |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 97 | if (unlikely(err)) { |
Brian Norris | d57f4054 | 2011-09-20 18:34:25 -0700 | [diff] [blame] | 98 | if (mtd_is_eccerr(err)) { |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 99 | mtd->ecc_stats.failed++; |
Thomas Gleixner | 9a1fcdf | 2006-05-29 14:56:39 +0200 | [diff] [blame] | 100 | ret = err; |
Brian Norris | d57f4054 | 2011-09-20 18:34:25 -0700 | [diff] [blame] | 101 | } else if (mtd_is_bitflip(err)) { |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 102 | mtd->ecc_stats.corrected++; |
| 103 | /* Do not overwrite -EBADMSG !! */ |
| 104 | if (!ret) |
| 105 | ret = err; |
| 106 | } else |
| 107 | return err; |
Thomas Gleixner | 9a1fcdf | 2006-05-29 14:56:39 +0200 | [diff] [blame] | 108 | } |
| 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | *retlen += retsize; |
| 111 | len -= size; |
| 112 | if (len == 0) |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 113 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | buf += size; |
| 116 | from = 0; |
| 117 | } |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 118 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | static int |
| 122 | concat_write(struct mtd_info *mtd, loff_t to, size_t len, |
| 123 | size_t * retlen, const u_char * buf) |
| 124 | { |
| 125 | struct mtd_concat *concat = CONCAT(mtd); |
| 126 | int err = -EINVAL; |
| 127 | int i; |
| 128 | |
| 129 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 130 | return -EROFS; |
| 131 | |
| 132 | *retlen = 0; |
| 133 | |
| 134 | for (i = 0; i < concat->num_subdev; i++) { |
| 135 | struct mtd_info *subdev = concat->subdev[i]; |
| 136 | size_t size, retsize; |
| 137 | |
| 138 | if (to >= subdev->size) { |
| 139 | size = 0; |
| 140 | to -= subdev->size; |
| 141 | continue; |
| 142 | } |
| 143 | if (to + len > subdev->size) |
| 144 | size = subdev->size - to; |
| 145 | else |
| 146 | size = len; |
| 147 | |
| 148 | if (!(subdev->flags & MTD_WRITEABLE)) |
| 149 | err = -EROFS; |
| 150 | else |
| 151 | err = subdev->write(subdev, to, size, &retsize, buf); |
| 152 | |
| 153 | if (err) |
| 154 | break; |
| 155 | |
| 156 | *retlen += retsize; |
| 157 | len -= size; |
| 158 | if (len == 0) |
| 159 | break; |
| 160 | |
| 161 | err = -EINVAL; |
| 162 | buf += size; |
| 163 | to = 0; |
| 164 | } |
| 165 | return err; |
| 166 | } |
| 167 | |
| 168 | static int |
Thomas Gleixner | 9d8522d | 2006-05-23 16:06:03 +0200 | [diff] [blame] | 169 | concat_writev(struct mtd_info *mtd, const struct kvec *vecs, |
| 170 | unsigned long count, loff_t to, size_t * retlen) |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 171 | { |
| 172 | struct mtd_concat *concat = CONCAT(mtd); |
| 173 | struct kvec *vecs_copy; |
| 174 | unsigned long entry_low, entry_high; |
| 175 | size_t total_len = 0; |
| 176 | int i; |
| 177 | int err = -EINVAL; |
| 178 | |
| 179 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 180 | return -EROFS; |
| 181 | |
| 182 | *retlen = 0; |
| 183 | |
| 184 | /* Calculate total length of data */ |
| 185 | for (i = 0; i < count; i++) |
| 186 | total_len += vecs[i].iov_len; |
| 187 | |
| 188 | /* Do not allow write past end of device */ |
| 189 | if ((to + total_len) > mtd->size) |
| 190 | return -EINVAL; |
| 191 | |
| 192 | /* Check alignment */ |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 193 | if (mtd->writesize > 1) { |
David Woodhouse | 0bf9733 | 2007-07-23 13:07:06 +0100 | [diff] [blame] | 194 | uint64_t __to = to; |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 195 | if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize)) |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 196 | return -EINVAL; |
Andrew Morton | 6c8b44a | 2006-05-20 10:17:21 +0100 | [diff] [blame] | 197 | } |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 198 | |
| 199 | /* make a copy of vecs */ |
Julia Lawall | d80f266 | 2010-05-15 23:23:31 +0200 | [diff] [blame] | 200 | vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL); |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 201 | if (!vecs_copy) |
| 202 | return -ENOMEM; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 203 | |
| 204 | entry_low = 0; |
| 205 | for (i = 0; i < concat->num_subdev; i++) { |
| 206 | struct mtd_info *subdev = concat->subdev[i]; |
| 207 | size_t size, wsize, retsize, old_iov_len; |
| 208 | |
| 209 | if (to >= subdev->size) { |
| 210 | to -= subdev->size; |
| 211 | continue; |
| 212 | } |
| 213 | |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 214 | size = min_t(uint64_t, total_len, subdev->size - to); |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 215 | wsize = size; /* store for future use */ |
| 216 | |
| 217 | entry_high = entry_low; |
| 218 | while (entry_high < count) { |
| 219 | if (size <= vecs_copy[entry_high].iov_len) |
| 220 | break; |
| 221 | size -= vecs_copy[entry_high++].iov_len; |
| 222 | } |
| 223 | |
| 224 | old_iov_len = vecs_copy[entry_high].iov_len; |
| 225 | vecs_copy[entry_high].iov_len = size; |
| 226 | |
| 227 | if (!(subdev->flags & MTD_WRITEABLE)) |
| 228 | err = -EROFS; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 229 | else |
| 230 | err = subdev->writev(subdev, &vecs_copy[entry_low], |
| 231 | entry_high - entry_low + 1, to, &retsize); |
| 232 | |
| 233 | vecs_copy[entry_high].iov_len = old_iov_len - size; |
| 234 | vecs_copy[entry_high].iov_base += size; |
| 235 | |
| 236 | entry_low = entry_high; |
| 237 | |
| 238 | if (err) |
| 239 | break; |
| 240 | |
| 241 | *retlen += retsize; |
| 242 | total_len -= wsize; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 243 | |
| 244 | if (total_len == 0) |
| 245 | break; |
| 246 | |
| 247 | err = -EINVAL; |
| 248 | to = 0; |
| 249 | } |
| 250 | |
| 251 | kfree(vecs_copy); |
| 252 | return err; |
| 253 | } |
| 254 | |
| 255 | static int |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 256 | 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] | 257 | { |
| 258 | struct mtd_concat *concat = CONCAT(mtd); |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 259 | struct mtd_oob_ops devops = *ops; |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 260 | int i, err, ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 262 | ops->retlen = ops->oobretlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
| 264 | for (i = 0; i < concat->num_subdev; i++) { |
| 265 | struct mtd_info *subdev = concat->subdev[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
| 267 | if (from >= subdev->size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | from -= subdev->size; |
| 269 | continue; |
| 270 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 272 | /* partial read ? */ |
| 273 | if (from + devops.len > subdev->size) |
| 274 | devops.len = subdev->size - from; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 276 | err = subdev->read_oob(subdev, from, &devops); |
| 277 | ops->retlen += devops.retlen; |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 278 | ops->oobretlen += devops.oobretlen; |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 279 | |
| 280 | /* Save information about bitflips! */ |
| 281 | if (unlikely(err)) { |
Brian Norris | d57f4054 | 2011-09-20 18:34:25 -0700 | [diff] [blame] | 282 | if (mtd_is_eccerr(err)) { |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 283 | mtd->ecc_stats.failed++; |
| 284 | ret = err; |
Brian Norris | d57f4054 | 2011-09-20 18:34:25 -0700 | [diff] [blame] | 285 | } else if (mtd_is_bitflip(err)) { |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 286 | mtd->ecc_stats.corrected++; |
| 287 | /* Do not overwrite -EBADMSG !! */ |
| 288 | if (!ret) |
| 289 | ret = err; |
| 290 | } else |
| 291 | return err; |
| 292 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 294 | if (devops.datbuf) { |
| 295 | devops.len = ops->len - ops->retlen; |
| 296 | if (!devops.len) |
| 297 | return ret; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 298 | devops.datbuf += devops.retlen; |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 299 | } |
| 300 | if (devops.oobbuf) { |
| 301 | devops.ooblen = ops->ooblen - ops->oobretlen; |
| 302 | if (!devops.ooblen) |
| 303 | return ret; |
| 304 | devops.oobbuf += ops->oobretlen; |
| 305 | } |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | from = 0; |
| 308 | } |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 309 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | static int |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 313 | 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] | 314 | { |
| 315 | struct mtd_concat *concat = CONCAT(mtd); |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 316 | struct mtd_oob_ops devops = *ops; |
| 317 | int i, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
| 319 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 320 | return -EROFS; |
| 321 | |
Felix Radensky | 431e1ec | 2011-04-25 01:57:12 +0300 | [diff] [blame] | 322 | ops->retlen = ops->oobretlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | for (i = 0; i < concat->num_subdev; i++) { |
| 325 | struct mtd_info *subdev = concat->subdev[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | if (to >= subdev->size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | to -= subdev->size; |
| 329 | continue; |
| 330 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 332 | /* partial write ? */ |
| 333 | if (to + devops.len > subdev->size) |
| 334 | devops.len = subdev->size - to; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 336 | err = subdev->write_oob(subdev, to, &devops); |
Felix Radensky | 431e1ec | 2011-04-25 01:57:12 +0300 | [diff] [blame] | 337 | ops->retlen += devops.oobretlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | if (err) |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 339 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 341 | if (devops.datbuf) { |
| 342 | devops.len = ops->len - ops->retlen; |
| 343 | if (!devops.len) |
| 344 | return 0; |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 345 | devops.datbuf += devops.retlen; |
Vitaly Wool | 7014568 | 2006-11-03 18:20:38 +0300 | [diff] [blame] | 346 | } |
| 347 | if (devops.oobbuf) { |
| 348 | devops.ooblen = ops->ooblen - ops->oobretlen; |
| 349 | if (!devops.ooblen) |
| 350 | return 0; |
| 351 | devops.oobbuf += devops.oobretlen; |
| 352 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | to = 0; |
| 354 | } |
Thomas Gleixner | 8593fbc | 2006-05-29 03:26:58 +0200 | [diff] [blame] | 355 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | static void concat_erase_callback(struct erase_info *instr) |
| 359 | { |
| 360 | wake_up((wait_queue_head_t *) instr->priv); |
| 361 | } |
| 362 | |
| 363 | static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase) |
| 364 | { |
| 365 | int err; |
| 366 | wait_queue_head_t waitq; |
| 367 | DECLARE_WAITQUEUE(wait, current); |
| 368 | |
| 369 | /* |
| 370 | * This code was stol^H^H^H^Hinspired by mtdchar.c |
| 371 | */ |
| 372 | init_waitqueue_head(&waitq); |
| 373 | |
| 374 | erase->mtd = mtd; |
| 375 | erase->callback = concat_erase_callback; |
| 376 | erase->priv = (unsigned long) &waitq; |
| 377 | |
| 378 | /* |
| 379 | * FIXME: Allow INTERRUPTIBLE. Which means |
| 380 | * not having the wait_queue head on the stack. |
| 381 | */ |
Artem Bityutskiy | 7e1f0dc | 2011-12-23 15:25:39 +0200 | [diff] [blame^] | 382 | err = mtd_erase(mtd, erase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | if (!err) { |
| 384 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 385 | add_wait_queue(&waitq, &wait); |
| 386 | if (erase->state != MTD_ERASE_DONE |
| 387 | && erase->state != MTD_ERASE_FAILED) |
| 388 | schedule(); |
| 389 | remove_wait_queue(&waitq, &wait); |
| 390 | set_current_state(TASK_RUNNING); |
| 391 | |
| 392 | err = (erase->state == MTD_ERASE_FAILED) ? -EIO : 0; |
| 393 | } |
| 394 | return err; |
| 395 | } |
| 396 | |
| 397 | static int concat_erase(struct mtd_info *mtd, struct erase_info *instr) |
| 398 | { |
| 399 | struct mtd_concat *concat = CONCAT(mtd); |
| 400 | struct mtd_info *subdev; |
| 401 | int i, err; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 402 | uint64_t length, offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | struct erase_info *erase; |
| 404 | |
| 405 | if (!(mtd->flags & MTD_WRITEABLE)) |
| 406 | return -EROFS; |
| 407 | |
| 408 | if (instr->addr > concat->mtd.size) |
| 409 | return -EINVAL; |
| 410 | |
| 411 | if (instr->len + instr->addr > concat->mtd.size) |
| 412 | return -EINVAL; |
| 413 | |
| 414 | /* |
| 415 | * Check for proper erase block alignment of the to-be-erased area. |
| 416 | * It is easier to do this based on the super device's erase |
| 417 | * region info rather than looking at each particular sub-device |
| 418 | * in turn. |
| 419 | */ |
| 420 | if (!concat->mtd.numeraseregions) { |
| 421 | /* the easy case: device has uniform erase block size */ |
| 422 | if (instr->addr & (concat->mtd.erasesize - 1)) |
| 423 | return -EINVAL; |
| 424 | if (instr->len & (concat->mtd.erasesize - 1)) |
| 425 | return -EINVAL; |
| 426 | } else { |
| 427 | /* device has variable erase size */ |
| 428 | struct mtd_erase_region_info *erase_regions = |
| 429 | concat->mtd.eraseregions; |
| 430 | |
| 431 | /* |
| 432 | * Find the erase region where the to-be-erased area begins: |
| 433 | */ |
| 434 | for (i = 0; i < concat->mtd.numeraseregions && |
| 435 | instr->addr >= erase_regions[i].offset; i++) ; |
| 436 | --i; |
| 437 | |
| 438 | /* |
| 439 | * Now erase_regions[i] is the region in which the |
| 440 | * to-be-erased area begins. Verify that the starting |
| 441 | * offset is aligned to this region's erase size: |
| 442 | */ |
Roel Kluin | ebf2e93 | 2009-09-18 12:51:49 -0700 | [diff] [blame] | 443 | if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | return -EINVAL; |
| 445 | |
| 446 | /* |
| 447 | * now find the erase region where the to-be-erased area ends: |
| 448 | */ |
| 449 | for (; i < concat->mtd.numeraseregions && |
| 450 | (instr->addr + instr->len) >= erase_regions[i].offset; |
| 451 | ++i) ; |
| 452 | --i; |
| 453 | /* |
| 454 | * check if the ending offset is aligned to this region's erase size |
| 455 | */ |
Roel Kluin | ebf2e93 | 2009-09-18 12:51:49 -0700 | [diff] [blame] | 456 | if (i < 0 || ((instr->addr + instr->len) & |
| 457 | (erase_regions[i].erasesize - 1))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | return -EINVAL; |
| 459 | } |
| 460 | |
Adrian Hunter | bb0eb21 | 2008-08-12 12:40:50 +0300 | [diff] [blame] | 461 | instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
| 463 | /* make a local copy of instr to avoid modifying the caller's struct */ |
| 464 | erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL); |
| 465 | |
| 466 | if (!erase) |
| 467 | return -ENOMEM; |
| 468 | |
| 469 | *erase = *instr; |
| 470 | length = instr->len; |
| 471 | |
| 472 | /* |
| 473 | * find the subdevice where the to-be-erased area begins, adjust |
| 474 | * starting offset to be relative to the subdevice start |
| 475 | */ |
| 476 | for (i = 0; i < concat->num_subdev; i++) { |
| 477 | subdev = concat->subdev[i]; |
| 478 | if (subdev->size <= erase->addr) { |
| 479 | erase->addr -= subdev->size; |
| 480 | offset += subdev->size; |
| 481 | } else { |
| 482 | break; |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | /* must never happen since size limit has been verified above */ |
Eric Sesterhenn | 373ebfb | 2006-03-26 18:15:12 +0200 | [diff] [blame] | 487 | BUG_ON(i >= concat->num_subdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
| 489 | /* now do the erase: */ |
| 490 | err = 0; |
| 491 | for (; length > 0; i++) { |
| 492 | /* loop for all subdevices affected by this request */ |
| 493 | subdev = concat->subdev[i]; /* get current subdevice */ |
| 494 | |
| 495 | /* limit length to subdevice's size: */ |
| 496 | if (erase->addr + length > subdev->size) |
| 497 | erase->len = subdev->size - erase->addr; |
| 498 | else |
| 499 | erase->len = length; |
| 500 | |
| 501 | if (!(subdev->flags & MTD_WRITEABLE)) { |
| 502 | err = -EROFS; |
| 503 | break; |
| 504 | } |
| 505 | length -= erase->len; |
| 506 | if ((err = concat_dev_erase(subdev, erase))) { |
| 507 | /* sanity check: should never happen since |
| 508 | * block alignment has been checked above */ |
Eric Sesterhenn | 373ebfb | 2006-03-26 18:15:12 +0200 | [diff] [blame] | 509 | BUG_ON(err == -EINVAL); |
Adrian Hunter | bb0eb21 | 2008-08-12 12:40:50 +0300 | [diff] [blame] | 510 | if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | instr->fail_addr = erase->fail_addr + offset; |
| 512 | break; |
| 513 | } |
| 514 | /* |
| 515 | * erase->addr specifies the offset of the area to be |
| 516 | * erased *within the current subdevice*. It can be |
| 517 | * non-zero only the first time through this loop, i.e. |
| 518 | * for the first subdevice where blocks need to be erased. |
| 519 | * All the following erases must begin at the start of the |
| 520 | * current subdevice, i.e. at offset zero. |
| 521 | */ |
| 522 | erase->addr = 0; |
| 523 | offset += subdev->size; |
| 524 | } |
| 525 | instr->state = erase->state; |
| 526 | kfree(erase); |
| 527 | if (err) |
| 528 | return err; |
| 529 | |
| 530 | if (instr->callback) |
| 531 | instr->callback(instr); |
| 532 | return 0; |
| 533 | } |
| 534 | |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 535 | 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] | 536 | { |
| 537 | struct mtd_concat *concat = CONCAT(mtd); |
| 538 | int i, err = -EINVAL; |
| 539 | |
| 540 | if ((len + ofs) > mtd->size) |
| 541 | return -EINVAL; |
| 542 | |
| 543 | for (i = 0; i < concat->num_subdev; i++) { |
| 544 | struct mtd_info *subdev = concat->subdev[i]; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 545 | uint64_t size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
| 547 | if (ofs >= subdev->size) { |
| 548 | size = 0; |
| 549 | ofs -= subdev->size; |
| 550 | continue; |
| 551 | } |
| 552 | if (ofs + len > subdev->size) |
| 553 | size = subdev->size - ofs; |
| 554 | else |
| 555 | size = len; |
| 556 | |
Martin Krause | e1d0fe3 | 2010-06-22 15:00:19 +0200 | [diff] [blame] | 557 | if (subdev->lock) { |
| 558 | err = subdev->lock(subdev, ofs, size); |
| 559 | if (err) |
| 560 | break; |
| 561 | } else |
| 562 | err = -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | len -= size; |
| 565 | if (len == 0) |
| 566 | break; |
| 567 | |
| 568 | err = -EINVAL; |
| 569 | ofs = 0; |
| 570 | } |
| 571 | |
| 572 | return err; |
| 573 | } |
| 574 | |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 575 | 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] | 576 | { |
| 577 | struct mtd_concat *concat = CONCAT(mtd); |
| 578 | int i, err = 0; |
| 579 | |
| 580 | if ((len + ofs) > mtd->size) |
| 581 | return -EINVAL; |
| 582 | |
| 583 | for (i = 0; i < concat->num_subdev; i++) { |
| 584 | struct mtd_info *subdev = concat->subdev[i]; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 585 | uint64_t size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
| 587 | if (ofs >= subdev->size) { |
| 588 | size = 0; |
| 589 | ofs -= subdev->size; |
| 590 | continue; |
| 591 | } |
| 592 | if (ofs + len > subdev->size) |
| 593 | size = subdev->size - ofs; |
| 594 | else |
| 595 | size = len; |
| 596 | |
Martin Krause | e1d0fe3 | 2010-06-22 15:00:19 +0200 | [diff] [blame] | 597 | if (subdev->unlock) { |
| 598 | err = subdev->unlock(subdev, ofs, size); |
| 599 | if (err) |
| 600 | break; |
| 601 | } else |
| 602 | err = -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | len -= size; |
| 605 | if (len == 0) |
| 606 | break; |
| 607 | |
| 608 | err = -EINVAL; |
| 609 | ofs = 0; |
| 610 | } |
| 611 | |
| 612 | return err; |
| 613 | } |
| 614 | |
| 615 | static void concat_sync(struct mtd_info *mtd) |
| 616 | { |
| 617 | struct mtd_concat *concat = CONCAT(mtd); |
| 618 | int i; |
| 619 | |
| 620 | for (i = 0; i < concat->num_subdev; i++) { |
| 621 | struct mtd_info *subdev = concat->subdev[i]; |
| 622 | subdev->sync(subdev); |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | static int concat_suspend(struct mtd_info *mtd) |
| 627 | { |
| 628 | struct mtd_concat *concat = CONCAT(mtd); |
| 629 | int i, rc = 0; |
| 630 | |
| 631 | for (i = 0; i < concat->num_subdev; i++) { |
| 632 | struct mtd_info *subdev = concat->subdev[i]; |
| 633 | if ((rc = subdev->suspend(subdev)) < 0) |
| 634 | return rc; |
| 635 | } |
| 636 | return rc; |
| 637 | } |
| 638 | |
| 639 | static void concat_resume(struct mtd_info *mtd) |
| 640 | { |
| 641 | struct mtd_concat *concat = CONCAT(mtd); |
| 642 | int i; |
| 643 | |
| 644 | for (i = 0; i < concat->num_subdev; i++) { |
| 645 | struct mtd_info *subdev = concat->subdev[i]; |
| 646 | subdev->resume(subdev); |
| 647 | } |
| 648 | } |
| 649 | |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 650 | static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs) |
| 651 | { |
| 652 | struct mtd_concat *concat = CONCAT(mtd); |
| 653 | int i, res = 0; |
| 654 | |
| 655 | if (!concat->subdev[0]->block_isbad) |
| 656 | return res; |
| 657 | |
| 658 | if (ofs > mtd->size) |
| 659 | return -EINVAL; |
| 660 | |
| 661 | for (i = 0; i < concat->num_subdev; i++) { |
| 662 | struct mtd_info *subdev = concat->subdev[i]; |
| 663 | |
| 664 | if (ofs >= subdev->size) { |
| 665 | ofs -= subdev->size; |
| 666 | continue; |
| 667 | } |
| 668 | |
| 669 | res = subdev->block_isbad(subdev, ofs); |
| 670 | break; |
| 671 | } |
| 672 | |
| 673 | return res; |
| 674 | } |
| 675 | |
| 676 | static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs) |
| 677 | { |
| 678 | struct mtd_concat *concat = CONCAT(mtd); |
| 679 | int i, err = -EINVAL; |
| 680 | |
| 681 | if (!concat->subdev[0]->block_markbad) |
| 682 | return 0; |
| 683 | |
| 684 | if (ofs > mtd->size) |
| 685 | return -EINVAL; |
| 686 | |
| 687 | for (i = 0; i < concat->num_subdev; i++) { |
| 688 | struct mtd_info *subdev = concat->subdev[i]; |
| 689 | |
| 690 | if (ofs >= subdev->size) { |
| 691 | ofs -= subdev->size; |
| 692 | continue; |
| 693 | } |
| 694 | |
| 695 | err = subdev->block_markbad(subdev, ofs); |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 696 | if (!err) |
| 697 | mtd->ecc_stats.badblocks++; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 698 | break; |
| 699 | } |
| 700 | |
| 701 | return err; |
| 702 | } |
| 703 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | /* |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 705 | * try to support NOMMU mmaps on concatenated devices |
| 706 | * - we don't support subdev spanning as we can't guarantee it'll work |
| 707 | */ |
| 708 | static unsigned long concat_get_unmapped_area(struct mtd_info *mtd, |
| 709 | unsigned long len, |
| 710 | unsigned long offset, |
| 711 | unsigned long flags) |
| 712 | { |
| 713 | struct mtd_concat *concat = CONCAT(mtd); |
| 714 | int i; |
| 715 | |
| 716 | for (i = 0; i < concat->num_subdev; i++) { |
| 717 | struct mtd_info *subdev = concat->subdev[i]; |
| 718 | |
| 719 | if (offset >= subdev->size) { |
| 720 | offset -= subdev->size; |
| 721 | continue; |
| 722 | } |
| 723 | |
| 724 | /* we've found the subdev over which the mapping will reside */ |
| 725 | if (offset + len > subdev->size) |
| 726 | return (unsigned long) -EINVAL; |
| 727 | |
| 728 | if (subdev->get_unmapped_area) |
| 729 | return subdev->get_unmapped_area(subdev, len, offset, |
| 730 | flags); |
| 731 | |
| 732 | break; |
| 733 | } |
| 734 | |
| 735 | return (unsigned long) -ENOSYS; |
| 736 | } |
| 737 | |
| 738 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | * This function constructs a virtual MTD device by concatenating |
| 740 | * num_devs MTD devices. A pointer to the new device object is |
| 741 | * stored to *new_dev upon success. This function does _not_ |
| 742 | * register any devices: this is the caller's responsibility. |
| 743 | */ |
| 744 | struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */ |
| 745 | int num_devs, /* number of subdevices */ |
Kay Sievers | 160bbab | 2008-12-23 10:00:14 +0000 | [diff] [blame] | 746 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | { /* name for the new device */ |
| 748 | int i; |
| 749 | size_t size; |
| 750 | struct mtd_concat *concat; |
David Woodhouse | 26cdb67 | 2008-12-10 14:08:12 +0000 | [diff] [blame] | 751 | uint32_t max_erasesize, curr_erasesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | int num_erase_region; |
Holger Brunck | 771df61 | 2011-01-24 17:45:42 +0100 | [diff] [blame] | 753 | int max_writebufsize = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
| 755 | printk(KERN_NOTICE "Concatenating MTD devices:\n"); |
| 756 | for (i = 0; i < num_devs; i++) |
| 757 | printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name); |
| 758 | printk(KERN_NOTICE "into device \"%s\"\n", name); |
| 759 | |
| 760 | /* allocate the device structure */ |
| 761 | size = SIZEOF_STRUCT_MTD_CONCAT(num_devs); |
Burman Yan | 95b93a0 | 2006-11-15 21:10:29 +0200 | [diff] [blame] | 762 | concat = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | if (!concat) { |
| 764 | printk |
| 765 | ("memory allocation error while creating concatenated device \"%s\"\n", |
| 766 | name); |
| 767 | return NULL; |
| 768 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | concat->subdev = (struct mtd_info **) (concat + 1); |
| 770 | |
| 771 | /* |
| 772 | * Set up the new "super" device's MTD object structure, check for |
Brian Norris | 92394b5c | 2011-07-20 09:53:42 -0700 | [diff] [blame] | 773 | * incompatibilities between the subdevices. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | */ |
| 775 | concat->mtd.type = subdev[0]->type; |
| 776 | concat->mtd.flags = subdev[0]->flags; |
| 777 | concat->mtd.size = subdev[0]->size; |
| 778 | concat->mtd.erasesize = subdev[0]->erasesize; |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 779 | concat->mtd.writesize = subdev[0]->writesize; |
Holger Brunck | 771df61 | 2011-01-24 17:45:42 +0100 | [diff] [blame] | 780 | |
| 781 | for (i = 0; i < num_devs; i++) |
| 782 | if (max_writebufsize < subdev[i]->writebufsize) |
| 783 | max_writebufsize = subdev[i]->writebufsize; |
| 784 | concat->mtd.writebufsize = max_writebufsize; |
| 785 | |
Chris Paulson-Ellis | a2e1b83 | 2007-10-12 10:54:06 +0100 | [diff] [blame] | 786 | concat->mtd.subpage_sft = subdev[0]->subpage_sft; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | concat->mtd.oobsize = subdev[0]->oobsize; |
Vitaly Wool | 1f92267 | 2007-03-06 16:56:34 +0300 | [diff] [blame] | 788 | concat->mtd.oobavail = subdev[0]->oobavail; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 789 | if (subdev[0]->writev) |
| 790 | concat->mtd.writev = concat_writev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | if (subdev[0]->read_oob) |
| 792 | concat->mtd.read_oob = concat_read_oob; |
| 793 | if (subdev[0]->write_oob) |
| 794 | concat->mtd.write_oob = concat_write_oob; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 795 | if (subdev[0]->block_isbad) |
| 796 | concat->mtd.block_isbad = concat_block_isbad; |
| 797 | if (subdev[0]->block_markbad) |
| 798 | concat->mtd.block_markbad = concat_block_markbad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 800 | concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks; |
| 801 | |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 802 | concat->mtd.backing_dev_info = subdev[0]->backing_dev_info; |
| 803 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | concat->subdev[0] = subdev[0]; |
| 805 | |
| 806 | for (i = 1; i < num_devs; i++) { |
| 807 | if (concat->mtd.type != subdev[i]->type) { |
| 808 | kfree(concat); |
| 809 | printk("Incompatible device type on \"%s\"\n", |
| 810 | subdev[i]->name); |
| 811 | return NULL; |
| 812 | } |
| 813 | if (concat->mtd.flags != subdev[i]->flags) { |
| 814 | /* |
| 815 | * Expect all flags except MTD_WRITEABLE to be |
| 816 | * equal on all subdevices. |
| 817 | */ |
| 818 | if ((concat->mtd.flags ^ subdev[i]-> |
| 819 | flags) & ~MTD_WRITEABLE) { |
| 820 | kfree(concat); |
| 821 | printk("Incompatible device flags on \"%s\"\n", |
| 822 | subdev[i]->name); |
| 823 | return NULL; |
| 824 | } else |
| 825 | /* if writeable attribute differs, |
| 826 | make super device writeable */ |
| 827 | concat->mtd.flags |= |
| 828 | subdev[i]->flags & MTD_WRITEABLE; |
| 829 | } |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 830 | |
| 831 | /* only permit direct mapping if the BDIs are all the same |
| 832 | * - copy-mapping is still permitted |
| 833 | */ |
| 834 | if (concat->mtd.backing_dev_info != |
| 835 | subdev[i]->backing_dev_info) |
| 836 | concat->mtd.backing_dev_info = |
| 837 | &default_backing_dev_info; |
| 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | concat->mtd.size += subdev[i]->size; |
Thomas Gleixner | f1a28c0 | 2006-05-30 00:37:34 +0200 | [diff] [blame] | 840 | concat->mtd.ecc_stats.badblocks += |
| 841 | subdev[i]->ecc_stats.badblocks; |
Joern Engel | 2831877 | 2006-05-22 23:18:05 +0200 | [diff] [blame] | 842 | if (concat->mtd.writesize != subdev[i]->writesize || |
Thomas Gleixner | 29072b9 | 2006-09-28 15:38:36 +0200 | [diff] [blame] | 843 | concat->mtd.subpage_sft != subdev[i]->subpage_sft || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | concat->mtd.oobsize != subdev[i]->oobsize || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | !concat->mtd.read_oob != !subdev[i]->read_oob || |
| 846 | !concat->mtd.write_oob != !subdev[i]->write_oob) { |
| 847 | kfree(concat); |
| 848 | printk("Incompatible OOB or ECC data on \"%s\"\n", |
| 849 | subdev[i]->name); |
| 850 | return NULL; |
| 851 | } |
| 852 | concat->subdev[i] = subdev[i]; |
| 853 | |
| 854 | } |
| 855 | |
Thomas Gleixner | 5bd34c0 | 2006-05-27 22:16:10 +0200 | [diff] [blame] | 856 | concat->mtd.ecclayout = subdev[0]->ecclayout; |
Alexander Belyakov | e8d3293 | 2006-05-17 19:11:16 +0400 | [diff] [blame] | 857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | concat->num_subdev = num_devs; |
| 859 | concat->mtd.name = name; |
| 860 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | concat->mtd.erase = concat_erase; |
| 862 | concat->mtd.read = concat_read; |
| 863 | concat->mtd.write = concat_write; |
| 864 | concat->mtd.sync = concat_sync; |
| 865 | concat->mtd.lock = concat_lock; |
| 866 | concat->mtd.unlock = concat_unlock; |
| 867 | concat->mtd.suspend = concat_suspend; |
| 868 | concat->mtd.resume = concat_resume; |
David Howells | 6e232cf | 2009-02-12 10:40:05 +0000 | [diff] [blame] | 869 | concat->mtd.get_unmapped_area = concat_get_unmapped_area; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
| 871 | /* |
| 872 | * Combine the erase block size info of the subdevices: |
| 873 | * |
| 874 | * first, walk the map of the new device and see how |
| 875 | * many changes in erase size we have |
| 876 | */ |
| 877 | max_erasesize = curr_erasesize = subdev[0]->erasesize; |
| 878 | num_erase_region = 1; |
| 879 | for (i = 0; i < num_devs; i++) { |
| 880 | if (subdev[i]->numeraseregions == 0) { |
| 881 | /* current subdevice has uniform erase size */ |
| 882 | if (subdev[i]->erasesize != curr_erasesize) { |
| 883 | /* if it differs from the last subdevice's erase size, count it */ |
| 884 | ++num_erase_region; |
| 885 | curr_erasesize = subdev[i]->erasesize; |
| 886 | if (curr_erasesize > max_erasesize) |
| 887 | max_erasesize = curr_erasesize; |
| 888 | } |
| 889 | } else { |
| 890 | /* current subdevice has variable erase size */ |
| 891 | int j; |
| 892 | for (j = 0; j < subdev[i]->numeraseregions; j++) { |
| 893 | |
| 894 | /* walk the list of erase regions, count any changes */ |
| 895 | if (subdev[i]->eraseregions[j].erasesize != |
| 896 | curr_erasesize) { |
| 897 | ++num_erase_region; |
| 898 | curr_erasesize = |
| 899 | subdev[i]->eraseregions[j]. |
| 900 | erasesize; |
| 901 | if (curr_erasesize > max_erasesize) |
| 902 | max_erasesize = curr_erasesize; |
| 903 | } |
| 904 | } |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | if (num_erase_region == 1) { |
| 909 | /* |
| 910 | * All subdevices have the same uniform erase size. |
| 911 | * This is easy: |
| 912 | */ |
| 913 | concat->mtd.erasesize = curr_erasesize; |
| 914 | concat->mtd.numeraseregions = 0; |
| 915 | } else { |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 916 | uint64_t tmp64; |
| 917 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | /* |
| 919 | * erase block size varies across the subdevices: allocate |
| 920 | * space to store the data describing the variable erase regions |
| 921 | */ |
| 922 | struct mtd_erase_region_info *erase_region_p; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 923 | uint64_t begin, position; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | concat->mtd.erasesize = max_erasesize; |
| 926 | concat->mtd.numeraseregions = num_erase_region; |
| 927 | concat->mtd.eraseregions = erase_region_p = |
| 928 | kmalloc(num_erase_region * |
| 929 | sizeof (struct mtd_erase_region_info), GFP_KERNEL); |
| 930 | if (!erase_region_p) { |
| 931 | kfree(concat); |
| 932 | printk |
| 933 | ("memory allocation error while creating erase region list" |
| 934 | " for device \"%s\"\n", name); |
| 935 | return NULL; |
| 936 | } |
| 937 | |
| 938 | /* |
| 939 | * walk the map of the new device once more and fill in |
| 940 | * in erase region info: |
| 941 | */ |
| 942 | curr_erasesize = subdev[0]->erasesize; |
| 943 | begin = position = 0; |
| 944 | for (i = 0; i < num_devs; i++) { |
| 945 | if (subdev[i]->numeraseregions == 0) { |
| 946 | /* current subdevice has uniform erase size */ |
| 947 | if (subdev[i]->erasesize != curr_erasesize) { |
| 948 | /* |
| 949 | * fill in an mtd_erase_region_info structure for the area |
| 950 | * we have walked so far: |
| 951 | */ |
| 952 | erase_region_p->offset = begin; |
| 953 | erase_region_p->erasesize = |
| 954 | curr_erasesize; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 955 | tmp64 = position - begin; |
| 956 | do_div(tmp64, curr_erasesize); |
| 957 | erase_region_p->numblocks = tmp64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | begin = position; |
| 959 | |
| 960 | curr_erasesize = subdev[i]->erasesize; |
| 961 | ++erase_region_p; |
| 962 | } |
| 963 | position += subdev[i]->size; |
| 964 | } else { |
| 965 | /* current subdevice has variable erase size */ |
| 966 | int j; |
| 967 | for (j = 0; j < subdev[i]->numeraseregions; j++) { |
| 968 | /* walk the list of erase regions, count any changes */ |
| 969 | if (subdev[i]->eraseregions[j]. |
| 970 | erasesize != curr_erasesize) { |
| 971 | erase_region_p->offset = begin; |
| 972 | erase_region_p->erasesize = |
| 973 | curr_erasesize; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 974 | tmp64 = position - begin; |
| 975 | do_div(tmp64, curr_erasesize); |
| 976 | erase_region_p->numblocks = tmp64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | begin = position; |
| 978 | |
| 979 | curr_erasesize = |
| 980 | subdev[i]->eraseregions[j]. |
| 981 | erasesize; |
| 982 | ++erase_region_p; |
| 983 | } |
| 984 | position += |
| 985 | subdev[i]->eraseregions[j]. |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 986 | numblocks * (uint64_t)curr_erasesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | } |
| 988 | } |
| 989 | } |
| 990 | /* Now write the final entry */ |
| 991 | erase_region_p->offset = begin; |
| 992 | erase_region_p->erasesize = curr_erasesize; |
Adrian Hunter | 69423d9 | 2008-12-10 13:37:21 +0000 | [diff] [blame] | 993 | tmp64 = position - begin; |
| 994 | do_div(tmp64, curr_erasesize); |
| 995 | erase_region_p->numblocks = tmp64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | return &concat->mtd; |
| 999 | } |
| 1000 | |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 1001 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | * This function destroys an MTD object obtained from concat_mtd_devs() |
| 1003 | */ |
| 1004 | |
| 1005 | void mtd_concat_destroy(struct mtd_info *mtd) |
| 1006 | { |
| 1007 | struct mtd_concat *concat = CONCAT(mtd); |
| 1008 | if (concat->mtd.numeraseregions) |
| 1009 | kfree(concat->mtd.eraseregions); |
| 1010 | kfree(concat); |
| 1011 | } |
| 1012 | |
| 1013 | EXPORT_SYMBOL(mtd_concat_create); |
| 1014 | EXPORT_SYMBOL(mtd_concat_destroy); |
| 1015 | |
| 1016 | MODULE_LICENSE("GPL"); |
| 1017 | MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>"); |
| 1018 | MODULE_DESCRIPTION("Generic support for concatenating of MTD devices"); |