1 /* 2 * Simple MTD partitioning layer 3 * 4 * (C) 2000 Nicolas Pitre <nico@cam.org> 5 * 6 * This code is GPL 7 * 8 * 02-21-2002 Thomas Gleixner <gleixner@autronix.de> 9 * added support for read_oob, write_oob 10 */ 11 12 #include <common.h> 13 #include <malloc.h> 14 #include <asm/errno.h> 15 16 #include <linux/types.h> 17 #include <linux/list.h> 18 #include <linux/mtd/mtd.h> 19 #include <linux/mtd/partitions.h> 20 #include <linux/mtd/compat.h> 21 22 /* Our partition linked list */ 23 static LIST_HEAD(mtd_partitions); 24 25 /* Our partition node structure */ 26 struct mtd_part { 27 struct mtd_info mtd; 28 struct mtd_info *master; 29 u_int32_t offset; 30 int index; 31 struct list_head list; 32 int registered; 33 }; 34 35 /* 36 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve 37 * the pointer to that structure with this macro. 38 */ 39 #define PART(x) ((struct mtd_part *)(x)) 40 41 42 /* 43 * MTD methods which simply translate the effective address and pass through 44 * to the _real_ device. 45 */ 46 47 static int part_read (struct mtd_info *mtd, loff_t from, size_t len, 48 size_t *retlen, u_char *buf) 49 { 50 struct mtd_part *part = PART(mtd); 51 int res; 52 53 if (from >= mtd->size) 54 len = 0; 55 else if (from + len > mtd->size) 56 len = mtd->size - from; 57 res = part->master->read (part->master, from + part->offset, 58 len, retlen, buf); 59 if (unlikely(res)) { 60 if (res == -EUCLEAN) 61 mtd->ecc_stats.corrected++; 62 if (res == -EBADMSG) 63 mtd->ecc_stats.failed++; 64 } 65 return res; 66 } 67 68 #ifdef MTD_LINUX 69 static int part_point (struct mtd_info *mtd, loff_t from, size_t len, 70 size_t *retlen, void **virt, resource_size_t *phys) 71 { 72 struct mtd_part *part = PART(mtd); 73 if (from >= mtd->size) 74 len = 0; 75 else if (from + len > mtd->size) 76 len = mtd->size - from; 77 return part->master->point (part->master, from + part->offset, 78 len, retlen, virt, phys); 79 } 80 81 static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) 82 { 83 struct mtd_part *part = PART(mtd); 84 85 part->master->unpoint(part->master, from + part->offset, len); 86 } 87 #endif 88 89 static int part_read_oob(struct mtd_info *mtd, loff_t from, 90 struct mtd_oob_ops *ops) 91 { 92 struct mtd_part *part = PART(mtd); 93 int res; 94 95 if (from >= mtd->size) 96 return -EINVAL; 97 if (ops->datbuf && from + ops->len > mtd->size) 98 return -EINVAL; 99 res = part->master->read_oob(part->master, from + part->offset, ops); 100 101 if (unlikely(res)) { 102 if (res == -EUCLEAN) 103 mtd->ecc_stats.corrected++; 104 if (res == -EBADMSG) 105 mtd->ecc_stats.failed++; 106 } 107 return res; 108 } 109 110 static int part_read_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len, 111 size_t *retlen, u_char *buf) 112 { 113 struct mtd_part *part = PART(mtd); 114 return part->master->read_user_prot_reg (part->master, from, 115 len, retlen, buf); 116 } 117 118 static int part_get_user_prot_info (struct mtd_info *mtd, 119 struct otp_info *buf, size_t len) 120 { 121 struct mtd_part *part = PART(mtd); 122 return part->master->get_user_prot_info (part->master, buf, len); 123 } 124 125 static int part_read_fact_prot_reg (struct mtd_info *mtd, loff_t from, size_t len, 126 size_t *retlen, u_char *buf) 127 { 128 struct mtd_part *part = PART(mtd); 129 return part->master->read_fact_prot_reg (part->master, from, 130 len, retlen, buf); 131 } 132 133 static int part_get_fact_prot_info (struct mtd_info *mtd, 134 struct otp_info *buf, size_t len) 135 { 136 struct mtd_part *part = PART(mtd); 137 return part->master->get_fact_prot_info (part->master, buf, len); 138 } 139 140 static int part_write (struct mtd_info *mtd, loff_t to, size_t len, 141 size_t *retlen, const u_char *buf) 142 { 143 struct mtd_part *part = PART(mtd); 144 if (!(mtd->flags & MTD_WRITEABLE)) 145 return -EROFS; 146 if (to >= mtd->size) 147 len = 0; 148 else if (to + len > mtd->size) 149 len = mtd->size - to; 150 return part->master->write (part->master, to + part->offset, 151 len, retlen, buf); 152 } 153 154 #ifdef MTD_LINUX 155 static int part_panic_write (struct mtd_info *mtd, loff_t to, size_t len, 156 size_t *retlen, const u_char *buf) 157 { 158 struct mtd_part *part = PART(mtd); 159 if (!(mtd->flags & MTD_WRITEABLE)) 160 return -EROFS; 161 if (to >= mtd->size) 162 len = 0; 163 else if (to + len > mtd->size) 164 len = mtd->size - to; 165 return part->master->panic_write (part->master, to + part->offset, 166 len, retlen, buf); 167 } 168 #endif 169 170 static int part_write_oob(struct mtd_info *mtd, loff_t to, 171 struct mtd_oob_ops *ops) 172 { 173 struct mtd_part *part = PART(mtd); 174 175 if (!(mtd->flags & MTD_WRITEABLE)) 176 return -EROFS; 177 178 if (to >= mtd->size) 179 return -EINVAL; 180 if (ops->datbuf && to + ops->len > mtd->size) 181 return -EINVAL; 182 return part->master->write_oob(part->master, to + part->offset, ops); 183 } 184 185 static int part_write_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len, 186 size_t *retlen, u_char *buf) 187 { 188 struct mtd_part *part = PART(mtd); 189 return part->master->write_user_prot_reg (part->master, from, 190 len, retlen, buf); 191 } 192 193 static int part_lock_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len) 194 { 195 struct mtd_part *part = PART(mtd); 196 return part->master->lock_user_prot_reg (part->master, from, len); 197 } 198 199 #ifdef MTD_LINUX 200 static int part_writev (struct mtd_info *mtd, const struct kvec *vecs, 201 unsigned long count, loff_t to, size_t *retlen) 202 { 203 struct mtd_part *part = PART(mtd); 204 if (!(mtd->flags & MTD_WRITEABLE)) 205 return -EROFS; 206 return part->master->writev (part->master, vecs, count, 207 to + part->offset, retlen); 208 } 209 #endif 210 211 static int part_erase (struct mtd_info *mtd, struct erase_info *instr) 212 { 213 struct mtd_part *part = PART(mtd); 214 int ret; 215 if (!(mtd->flags & MTD_WRITEABLE)) 216 return -EROFS; 217 if (instr->addr >= mtd->size) 218 return -EINVAL; 219 instr->addr += part->offset; 220 ret = part->master->erase(part->master, instr); 221 if (ret) { 222 if (instr->fail_addr != 0xffffffff) 223 instr->fail_addr -= part->offset; 224 instr->addr -= part->offset; 225 } 226 return ret; 227 } 228 229 void mtd_erase_callback(struct erase_info *instr) 230 { 231 if (instr->mtd->erase == part_erase) { 232 struct mtd_part *part = PART(instr->mtd); 233 234 if (instr->fail_addr != 0xffffffff) 235 instr->fail_addr -= part->offset; 236 instr->addr -= part->offset; 237 } 238 if (instr->callback) 239 instr->callback(instr); 240 } 241 #ifdef MTD_LINUX 242 EXPORT_SYMBOL_GPL(mtd_erase_callback); 243 #endif 244 245 #ifdef MTD_LINUX 246 static int part_lock (struct mtd_info *mtd, loff_t ofs, size_t len) 247 { 248 struct mtd_part *part = PART(mtd); 249 if ((len + ofs) > mtd->size) 250 return -EINVAL; 251 return part->master->lock(part->master, ofs + part->offset, len); 252 } 253 254 static int part_unlock (struct mtd_info *mtd, loff_t ofs, size_t len) 255 { 256 struct mtd_part *part = PART(mtd); 257 if ((len + ofs) > mtd->size) 258 return -EINVAL; 259 return part->master->unlock(part->master, ofs + part->offset, len); 260 } 261 #endif 262 263 static void part_sync(struct mtd_info *mtd) 264 { 265 struct mtd_part *part = PART(mtd); 266 part->master->sync(part->master); 267 } 268 269 #ifdef MTD_LINUX 270 static int part_suspend(struct mtd_info *mtd) 271 { 272 struct mtd_part *part = PART(mtd); 273 return part->master->suspend(part->master); 274 } 275 276 static void part_resume(struct mtd_info *mtd) 277 { 278 struct mtd_part *part = PART(mtd); 279 part->master->resume(part->master); 280 } 281 #endif 282 283 static int part_block_isbad (struct mtd_info *mtd, loff_t ofs) 284 { 285 struct mtd_part *part = PART(mtd); 286 if (ofs >= mtd->size) 287 return -EINVAL; 288 ofs += part->offset; 289 return part->master->block_isbad(part->master, ofs); 290 } 291 292 static int part_block_markbad (struct mtd_info *mtd, loff_t ofs) 293 { 294 struct mtd_part *part = PART(mtd); 295 int res; 296 297 if (!(mtd->flags & MTD_WRITEABLE)) 298 return -EROFS; 299 if (ofs >= mtd->size) 300 return -EINVAL; 301 ofs += part->offset; 302 res = part->master->block_markbad(part->master, ofs); 303 #ifdef MTD_LINUX 304 if (!res) 305 mtd->ecc_stats.badblocks++; 306 #endif 307 return res; 308 } 309 310 /* 311 * This function unregisters and destroy all slave MTD objects which are 312 * attached to the given master MTD object. 313 */ 314 315 int del_mtd_partitions(struct mtd_info *master) 316 { 317 struct list_head *node; 318 struct mtd_part *slave; 319 320 for (node = mtd_partitions.next; 321 node != &mtd_partitions; 322 node = node->next) { 323 slave = list_entry(node, struct mtd_part, list); 324 if (slave->master == master) { 325 struct list_head *prev = node->prev; 326 __list_del(prev, node->next); 327 if(slave->registered) 328 del_mtd_device(&slave->mtd); 329 kfree(slave); 330 node = prev; 331 } 332 } 333 334 return 0; 335 } 336 337 /* 338 * This function, given a master MTD object and a partition table, creates 339 * and registers slave MTD objects which are bound to the master according to 340 * the partition definitions. 341 * (Q: should we register the master MTD object as well?) 342 */ 343 344 int add_mtd_partitions(struct mtd_info *master, 345 const struct mtd_partition *parts, 346 int nbparts) 347 { 348 struct mtd_part *slave; 349 u_int32_t cur_offset = 0; 350 int i; 351 352 printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); 353 354 for (i = 0; i < nbparts; i++) { 355 356 /* allocate the partition structure */ 357 slave = kzalloc (sizeof(*slave), GFP_KERNEL); 358 if (!slave) { 359 printk ("memory allocation error while creating partitions for \"%s\"\n", 360 master->name); 361 del_mtd_partitions(master); 362 return -ENOMEM; 363 } 364 list_add(&slave->list, &mtd_partitions); 365 366 /* set up the MTD object for this partition */ 367 slave->mtd.type = master->type; 368 slave->mtd.flags = master->flags & ~parts[i].mask_flags; 369 slave->mtd.size = parts[i].size; 370 slave->mtd.writesize = master->writesize; 371 slave->mtd.oobsize = master->oobsize; 372 slave->mtd.oobavail = master->oobavail; 373 slave->mtd.subpage_sft = master->subpage_sft; 374 375 slave->mtd.name = parts[i].name; 376 slave->mtd.owner = master->owner; 377 378 slave->mtd.read = part_read; 379 slave->mtd.write = part_write; 380 381 #ifdef MTD_LINUX 382 if (master->panic_write) 383 slave->mtd.panic_write = part_panic_write; 384 385 if(master->point && master->unpoint){ 386 slave->mtd.point = part_point; 387 slave->mtd.unpoint = part_unpoint; 388 } 389 #endif 390 391 if (master->read_oob) 392 slave->mtd.read_oob = part_read_oob; 393 if (master->write_oob) 394 slave->mtd.write_oob = part_write_oob; 395 if(master->read_user_prot_reg) 396 slave->mtd.read_user_prot_reg = part_read_user_prot_reg; 397 if(master->read_fact_prot_reg) 398 slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg; 399 if(master->write_user_prot_reg) 400 slave->mtd.write_user_prot_reg = part_write_user_prot_reg; 401 if(master->lock_user_prot_reg) 402 slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg; 403 if(master->get_user_prot_info) 404 slave->mtd.get_user_prot_info = part_get_user_prot_info; 405 if(master->get_fact_prot_info) 406 slave->mtd.get_fact_prot_info = part_get_fact_prot_info; 407 if (master->sync) 408 slave->mtd.sync = part_sync; 409 #ifdef MTD_LINUX 410 if (!i && master->suspend && master->resume) { 411 slave->mtd.suspend = part_suspend; 412 slave->mtd.resume = part_resume; 413 } 414 if (master->writev) 415 slave->mtd.writev = part_writev; 416 if (master->lock) 417 slave->mtd.lock = part_lock; 418 if (master->unlock) 419 slave->mtd.unlock = part_unlock; 420 #endif 421 if (master->block_isbad) 422 slave->mtd.block_isbad = part_block_isbad; 423 if (master->block_markbad) 424 slave->mtd.block_markbad = part_block_markbad; 425 slave->mtd.erase = part_erase; 426 slave->master = master; 427 slave->offset = parts[i].offset; 428 slave->index = i; 429 430 if (slave->offset == MTDPART_OFS_APPEND) 431 slave->offset = cur_offset; 432 if (slave->offset == MTDPART_OFS_NXTBLK) { 433 slave->offset = cur_offset; 434 if ((cur_offset % master->erasesize) != 0) { 435 /* Round up to next erasesize */ 436 slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize; 437 printk(KERN_NOTICE "Moving partition %d: " 438 "0x%08x -> 0x%08x\n", i, 439 cur_offset, slave->offset); 440 } 441 } 442 if (slave->mtd.size == MTDPART_SIZ_FULL) 443 slave->mtd.size = master->size - slave->offset; 444 cur_offset = slave->offset + slave->mtd.size; 445 446 printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset, 447 slave->offset + slave->mtd.size, slave->mtd.name); 448 449 /* let's do some sanity checks */ 450 if (slave->offset >= master->size) { 451 /* let's register it anyway to preserve ordering */ 452 slave->offset = 0; 453 slave->mtd.size = 0; 454 printk ("mtd: partition \"%s\" is out of reach -- disabled\n", 455 parts[i].name); 456 } 457 if (slave->offset + slave->mtd.size > master->size) { 458 slave->mtd.size = master->size - slave->offset; 459 printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n", 460 parts[i].name, master->name, slave->mtd.size); 461 } 462 if (master->numeraseregions>1) { 463 /* Deal with variable erase size stuff */ 464 int i; 465 struct mtd_erase_region_info *regions = master->eraseregions; 466 467 /* Find the first erase regions which is part of this partition. */ 468 for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++) 469 ; 470 471 for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) { 472 if (slave->mtd.erasesize < regions[i].erasesize) { 473 slave->mtd.erasesize = regions[i].erasesize; 474 } 475 } 476 } else { 477 /* Single erase size */ 478 slave->mtd.erasesize = master->erasesize; 479 } 480 481 if ((slave->mtd.flags & MTD_WRITEABLE) && 482 (slave->offset % slave->mtd.erasesize)) { 483 /* Doesn't start on a boundary of major erase size */ 484 /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */ 485 slave->mtd.flags &= ~MTD_WRITEABLE; 486 printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n", 487 parts[i].name); 488 } 489 if ((slave->mtd.flags & MTD_WRITEABLE) && 490 (slave->mtd.size % slave->mtd.erasesize)) { 491 slave->mtd.flags &= ~MTD_WRITEABLE; 492 printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n", 493 parts[i].name); 494 } 495 496 slave->mtd.ecclayout = master->ecclayout; 497 if (master->block_isbad) { 498 uint32_t offs = 0; 499 500 while(offs < slave->mtd.size) { 501 if (master->block_isbad(master, 502 offs + slave->offset)) 503 slave->mtd.ecc_stats.badblocks++; 504 offs += slave->mtd.erasesize; 505 } 506 } 507 508 #ifdef MTD_LINUX 509 if (parts[i].mtdp) { 510 /* store the object pointer 511 * (caller may or may not register it */ 512 *parts[i].mtdp = &slave->mtd; 513 slave->registered = 0; 514 } else { 515 /* register our partition */ 516 add_mtd_device(&slave->mtd); 517 slave->registered = 1; 518 } 519 #else 520 /* register our partition */ 521 add_mtd_device(&slave->mtd); 522 slave->registered = 1; 523 #endif 524 } 525 526 return 0; 527 } 528 529 #ifdef MTD_LINUX 530 EXPORT_SYMBOL(add_mtd_partitions); 531 EXPORT_SYMBOL(del_mtd_partitions); 532 #endif 533