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   1 /*
   2  * Simple MTD partitioning layer
   3  *
   4  * (C) 2000 Nicolas Pitre <nico@cam.org>
   5  *
   6  * This code is GPL
   7  *
   8  * $Id: mtdpart.c,v 1.55 2005/11/07 11:14:20 gleixner Exp $
   9  *
  10  *      02-21-2002      Thomas Gleixner <gleixner@autronix.de>
  11  *                      added support for read_oob, write_oob
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/list.h>
  19 #include <linux/config.h>
  20 #include <linux/kmod.h>
  21 #include <linux/mtd/mtd.h>
  22 #include <linux/mtd/partitions.h>
  23 #include <linux/mtd/compatmac.h>
  24
  25 /* Our partition linked list */
  26 static LIST_HEAD(mtd_partitions);
  27
  28 /* Our partition node structure */
  29 struct mtd_part {
  30         struct mtd_info mtd;
  31         struct mtd_info *master;
  32         u_int32_t offset;
  33         int index;
  34         struct list_head list;
  35         int registered;
  36 };
  37
  38 /*
  39  * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
  40  * the pointer to that structure with this macro.
  41  */
  42 #define PART(x)  ((struct mtd_part *)(x))
  43
  44
  45 /*
  46  * MTD methods which simply translate the effective address and pass through
  47  * to the _real_ device.
  48  */
  49
  50 static int part_read (struct mtd_info *mtd, loff_t from, size_t len,
  51                         size_t *retlen, u_char *buf)
  52 {
  53         struct mtd_part *part = PART(mtd);
  54         int res;
  55
  56         if (from >= mtd->size)
  57                 len = 0;
  58         else if (from + len > mtd->size)
  59                 len = mtd->size - from;
  60         res = part->master->read (part->master, from + part->offset,
  61                                    len, retlen, buf);
  62         if (unlikely(res)) {
  63                 if (res == -EUCLEAN)
  64                         mtd->ecc_stats.corrected++;
  65                 if (res == -EBADMSG)
  66                         mtd->ecc_stats.failed++;
  67         }
  68         return res;
  69 }
  70
  71 static int part_point (struct mtd_info *mtd, loff_t from, size_t len,
  72                         size_t *retlen, u_char **buf)
  73 {
  74         struct mtd_part *part = PART(mtd);
  75         if (from >= mtd->size)
  76                 len = 0;
  77         else if (from + len > mtd->size)
  78                 len = mtd->size - from;
  79         return part->master->point (part->master, from + part->offset,
  80                                     len, retlen, buf);
  81 }
  82
  83 static void part_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
  84 {
  85         struct mtd_part *part = PART(mtd);
  86
  87         part->master->unpoint (part->master, addr, from + part->offset, len);
  88 }
  89
  90 static int part_read_oob(struct mtd_info *mtd, loff_t from,
  91                          struct mtd_oob_ops *ops)
  92 {
  93         struct mtd_part *part = PART(mtd);
  94         int res;
  95
  96         if (from >= mtd->size)
  97                 return -EINVAL;
  98         if (from + ops->len > mtd->size)
  99                 return -EINVAL;
 100         res = part->master->read_oob(part->master, from + part->offset, ops);
 101
 102         if (unlikely(res)) {
 103                 if (res == -EUCLEAN)
 104                         mtd->ecc_stats.corrected++;
 105                 if (res == -EBADMSG)
 106                         mtd->ecc_stats.failed++;
 107         }
 108         return res;
 109 }
 110
 111 static int part_read_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
 112                         size_t *retlen, u_char *buf)
 113 {
 114         struct mtd_part *part = PART(mtd);
 115         return part->master->read_user_prot_reg (part->master, from,
 116                                         len, retlen, buf);
 117 }
 118
 119 static int part_get_user_prot_info (struct mtd_info *mtd,
 120                                     struct otp_info *buf, size_t len)
 121 {
 122         struct mtd_part *part = PART(mtd);
 123         return part->master->get_user_prot_info (part->master, buf, len);
 124 }
 125
 126 static int part_read_fact_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
 127                         size_t *retlen, u_char *buf)
 128 {
 129         struct mtd_part *part = PART(mtd);
 130         return part->master->read_fact_prot_reg (part->master, from,
 131                                         len, retlen, buf);
 132 }
 133
 134 static int part_get_fact_prot_info (struct mtd_info *mtd,
 135                                     struct otp_info *buf, size_t len)
 136 {
 137         struct mtd_part *part = PART(mtd);
 138         return part->master->get_fact_prot_info (part->master, buf, len);
 139 }
 140
 141 static int part_write (struct mtd_info *mtd, loff_t to, size_t len,
 142                         size_t *retlen, const u_char *buf)
 143 {
 144         struct mtd_part *part = PART(mtd);
 145         if (!(mtd->flags & MTD_WRITEABLE))
 146                 return -EROFS;
 147         if (to >= mtd->size)
 148                 len = 0;
 149         else if (to + len > mtd->size)
 150                 len = mtd->size - to;
 151         return part->master->write (part->master, to + part->offset,
 152                                     len, retlen, buf);
 153 }
 154
 155 static int part_write_oob(struct mtd_info *mtd, loff_t to,
 156                          struct mtd_oob_ops *ops)
 157 {
 158         struct mtd_part *part = PART(mtd);
 159
 160         if (!(mtd->flags & MTD_WRITEABLE))
 161                 return -EROFS;
 162
 163         if (to >= mtd->size)
 164                 return -EINVAL;
 165         if (to + ops->len > mtd->size)
 166                 return -EINVAL;
 167         return part->master->write_oob(part->master, to + part->offset, ops);
 168 }
 169
 170 static int part_write_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
 171                         size_t *retlen, u_char *buf)
 172 {
 173         struct mtd_part *part = PART(mtd);
 174         return part->master->write_user_prot_reg (part->master, from,
 175                                         len, retlen, buf);
 176 }
 177
 178 static int part_lock_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len)
 179 {
 180         struct mtd_part *part = PART(mtd);
 181         return part->master->lock_user_prot_reg (part->master, from, len);
 182 }
 183
 184 static int part_writev (struct mtd_info *mtd,  const struct kvec *vecs,
 185                          unsigned long count, loff_t to, size_t *retlen)
 186 {
 187         struct mtd_part *part = PART(mtd);
 188         if (!(mtd->flags & MTD_WRITEABLE))
 189                 return -EROFS;
 190         return part->master->writev (part->master, vecs, count,
 191                                         to + part->offset, retlen);
 192 }
 193
 194 static int part_erase (struct mtd_info *mtd, struct erase_info *instr)
 195 {
 196         struct mtd_part *part = PART(mtd);
 197         int ret;
 198         if (!(mtd->flags & MTD_WRITEABLE))
 199                 return -EROFS;
 200         if (instr->addr >= mtd->size)
 201                 return -EINVAL;
 202         instr->addr += part->offset;
 203         ret = part->master->erase(part->master, instr);
 204         return ret;
 205 }
 206
 207 void mtd_erase_callback(struct erase_info *instr)
 208 {
 209         if (instr->mtd->erase == part_erase) {
 210                 struct mtd_part *part = PART(instr->mtd);
 211
 212                 if (instr->fail_addr != 0xffffffff)
 213                         instr->fail_addr -= part->offset;
 214                 instr->addr -= part->offset;
 215         }
 216         if (instr->callback)
 217                 instr->callback(instr);
 218 }
 219 EXPORT_SYMBOL_GPL(mtd_erase_callback);
 220
 221 static int part_lock (struct mtd_info *mtd, loff_t ofs, size_t len)
 222 {
 223         struct mtd_part *part = PART(mtd);
 224         if ((len + ofs) > mtd->size)
 225                 return -EINVAL;
 226         return part->master->lock(part->master, ofs + part->offset, len);
 227 }
 228
 229 static int part_unlock (struct mtd_info *mtd, loff_t ofs, size_t len)
 230 {
 231         struct mtd_part *part = PART(mtd);
 232         if ((len + ofs) > mtd->size)
 233                 return -EINVAL;
 234         return part->master->unlock(part->master, ofs + part->offset, len);
 235 }
 236
 237 static void part_sync(struct mtd_info *mtd)
 238 {
 239         struct mtd_part *part = PART(mtd);
 240         part->master->sync(part->master);
 241 }
 242
 243 static int part_suspend(struct mtd_info *mtd)
 244 {
 245         struct mtd_part *part = PART(mtd);
 246         return part->master->suspend(part->master);
 247 }
 248
 249 static void part_resume(struct mtd_info *mtd)
 250 {
 251         struct mtd_part *part = PART(mtd);
 252         part->master->resume(part->master);
 253 }
 254
 255 static int part_block_isbad (struct mtd_info *mtd, loff_t ofs)
 256 {
 257         struct mtd_part *part = PART(mtd);
 258         if (ofs >= mtd->size)
 259                 return -EINVAL;
 260         ofs += part->offset;
 261         return part->master->block_isbad(part->master, ofs);
 262 }
 263
 264 static int part_block_markbad (struct mtd_info *mtd, loff_t ofs)
 265 {
 266         struct mtd_part *part = PART(mtd);
 267         int res;
 268
 269         if (!(mtd->flags & MTD_WRITEABLE))
 270                 return -EROFS;
 271         if (ofs >= mtd->size)
 272                 return -EINVAL;
 273         ofs += part->offset;
 274         res = part->master->block_markbad(part->master, ofs);
 275         if (!res)
 276                 mtd->ecc_stats.badblocks++;
 277         return res;
 278 }
 279
 280 /*
 281  * This function unregisters and destroy all slave MTD objects which are
 282  * attached to the given master MTD object.
 283  */
 284
 285 int del_mtd_partitions(struct mtd_info *master)
 286 {
 287         struct list_head *node;
 288         struct mtd_part *slave;
 289
 290         for (node = mtd_partitions.next;
 291              node != &mtd_partitions;
 292              node = node->next) {
 293                 slave = list_entry(node, struct mtd_part, list);
 294                 if (slave->master == master) {
 295                         struct list_head *prev = node->prev;
 296                         __list_del(prev, node->next);
 297                         if(slave->registered)
 298                                 del_mtd_device(&slave->mtd);
 299                         kfree(slave);
 300                         node = prev;
 301                 }
 302         }
 303
 304         return 0;
 305 }
 306
 307 /*
 308  * This function, given a master MTD object and a partition table, creates
 309  * and registers slave MTD objects which are bound to the master according to
 310  * the partition definitions.
 311  * (Q: should we register the master MTD object as well?)
 312  */
 313
 314 int add_mtd_partitions(struct mtd_info *master,
 315                        const struct mtd_partition *parts,
 316                        int nbparts)
 317 {
 318         struct mtd_part *slave;
 319         u_int32_t cur_offset = 0;
 320         int i;
 321
 322         printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 323
 324         for (i = 0; i < nbparts; i++) {
 325
 326                 /* allocate the partition structure */
 327                 slave = kmalloc (sizeof(*slave), GFP_KERNEL);
 328                 if (!slave) {
 329                         printk ("memory allocation error while creating partitions for \"%s\"\n",
 330                                 master->name);
 331                         del_mtd_partitions(master);
 332                         return -ENOMEM;
 333                 }
 334                 memset(slave, 0, sizeof(*slave));
 335                 list_add(&slave->list, &mtd_partitions);
 336
 337                 /* set up the MTD object for this partition */
 338                 slave->mtd.type = master->type;
 339                 slave->mtd.flags = master->flags & ~parts[i].mask_flags;
 340                 slave->mtd.size = parts[i].size;
 341                 slave->mtd.writesize = master->writesize;
 342                 slave->mtd.oobsize = master->oobsize;
 343                 slave->mtd.ecctype = master->ecctype;
 344                 slave->mtd.eccsize = master->eccsize;
 345
 346                 slave->mtd.name = parts[i].name;
 347                 slave->mtd.bank_size = master->bank_size;
 348                 slave->mtd.owner = master->owner;
 349
 350                 slave->mtd.read = part_read;
 351                 slave->mtd.write = part_write;
 352
 353                 if(master->point && master->unpoint){
 354                         slave->mtd.point = part_point;
 355                         slave->mtd.unpoint = part_unpoint;
 356                 }
 357
 358                 if (master->read_oob)
 359                         slave->mtd.read_oob = part_read_oob;
 360                 if (master->write_oob)
 361                         slave->mtd.write_oob = part_write_oob;
 362                 if(master->read_user_prot_reg)
 363                         slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
 364                 if(master->read_fact_prot_reg)
 365                         slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
 366                 if(master->write_user_prot_reg)
 367                         slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
 368                 if(master->lock_user_prot_reg)
 369                         slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
 370                 if(master->get_user_prot_info)
 371                         slave->mtd.get_user_prot_info = part_get_user_prot_info;
 372                 if(master->get_fact_prot_info)
 373                         slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
 374                 if (master->sync)
 375                         slave->mtd.sync = part_sync;
 376                 if (!i && master->suspend && master->resume) {
 377                                 slave->mtd.suspend = part_suspend;
 378                                 slave->mtd.resume = part_resume;
 379                 }
 380                 if (master->writev)
 381                         slave->mtd.writev = part_writev;
 382                 if (master->lock)
 383                         slave->mtd.lock = part_lock;
 384                 if (master->unlock)
 385                         slave->mtd.unlock = part_unlock;
 386                 if (master->block_isbad)
 387                         slave->mtd.block_isbad = part_block_isbad;
 388                 if (master->block_markbad)
 389                         slave->mtd.block_markbad = part_block_markbad;
 390                 slave->mtd.erase = part_erase;
 391                 slave->master = master;
 392                 slave->offset = parts[i].offset;
 393                 slave->index = i;
 394
 395                 if (slave->offset == MTDPART_OFS_APPEND)
 396                         slave->offset = cur_offset;
 397                 if (slave->offset == MTDPART_OFS_NXTBLK) {
 398                         slave->offset = cur_offset;
 399                         if ((cur_offset % master->erasesize) != 0) {
 400                                 /* Round up to next erasesize */
 401                                 slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
 402                                 printk(KERN_NOTICE "Moving partition %d: "
 403                                        "0x%08x -> 0x%08x\n", i,
 404                                        cur_offset, slave->offset);
 405                         }
 406                 }
 407                 if (slave->mtd.size == MTDPART_SIZ_FULL)
 408                         slave->mtd.size = master->size - slave->offset;
 409                 cur_offset = slave->offset + slave->mtd.size;
 410
 411                 printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
 412                         slave->offset + slave->mtd.size, slave->mtd.name);
 413
 414                 /* let's do some sanity checks */
 415                 if (slave->offset >= master->size) {
 416                                 /* let's register it anyway to preserve ordering */
 417                         slave->offset = 0;
 418                         slave->mtd.size = 0;
 419                         printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
 420                                 parts[i].name);
 421                 }
 422                 if (slave->offset + slave->mtd.size > master->size) {
 423                         slave->mtd.size = master->size - slave->offset;
 424                         printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
 425                                 parts[i].name, master->name, slave->mtd.size);
 426                 }
 427                 if (master->numeraseregions>1) {
 428                         /* Deal with variable erase size stuff */
 429                         int i;
 430                         struct mtd_erase_region_info *regions = master->eraseregions;
 431
 432                         /* Find the first erase regions which is part of this partition. */
 433                         for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
 434                                 ;
 435
 436                         for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
 437                                 if (slave->mtd.erasesize < regions[i].erasesize) {
 438                                         slave->mtd.erasesize = regions[i].erasesize;
 439                                 }
 440                         }
 441                 } else {
 442                         /* Single erase size */
 443                         slave->mtd.erasesize = master->erasesize;
 444                 }
 445
 446                 if ((slave->mtd.flags & MTD_WRITEABLE) &&
 447                     (slave->offset % slave->mtd.erasesize)) {
 448                         /* Doesn't start on a boundary of major erase size */
 449                         /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
 450                         slave->mtd.flags &= ~MTD_WRITEABLE;
 451                         printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 452                                 parts[i].name);
 453                 }
 454                 if ((slave->mtd.flags & MTD_WRITEABLE) &&
 455                     (slave->mtd.size % slave->mtd.erasesize)) {
 456                         slave->mtd.flags &= ~MTD_WRITEABLE;
 457                         printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 458                                 parts[i].name);
 459                 }
 460
 461                 slave->mtd.ecclayout = master->ecclayout;
 462                 if (master->block_isbad) {
 463                         uint32_t offs = 0;
 464
 465                         while(offs < slave->mtd.size) {
 466                                 if (master->block_isbad(master,
 467                                                         offs + slave->offset))
 468                                         slave->mtd.ecc_stats.badblocks++;
 469                                 offs += slave->mtd.erasesize;
 470                         }
 471                 }
 472
 473                 if(parts[i].mtdp)
 474                 {       /* store the object pointer (caller may or may not register it */
 475                         *parts[i].mtdp = &slave->mtd;
 476                         slave->registered = 0;
 477                 }
 478                 else
 479                 {
 480                         /* register our partition */
 481                         add_mtd_device(&slave->mtd);
 482                         slave->registered = 1;
 483                 }
 484         }
 485
 486         return 0;
 487 }
 488
 489 EXPORT_SYMBOL(add_mtd_partitions);
 490 EXPORT_SYMBOL(del_mtd_partitions);
 491
 492 static DEFINE_SPINLOCK(part_parser_lock);
 493 static LIST_HEAD(part_parsers);
 494
 495 static struct mtd_part_parser *get_partition_parser(const char *name)
 496 {
 497         struct list_head *this;
 498         void *ret = NULL;
 499         spin_lock(&part_parser_lock);
 500
 501         list_for_each(this, &part_parsers) {
 502                 struct mtd_part_parser *p = list_entry(this, struct mtd_part_parser, list);
 503
 504                 if (!strcmp(p->name, name) && try_module_get(p->owner)) {
 505                         ret = p;
 506                         break;
 507                 }
 508         }
 509         spin_unlock(&part_parser_lock);
 510
 511         return ret;
 512 }
 513
 514 int register_mtd_parser(struct mtd_part_parser *p)
 515 {
 516         spin_lock(&part_parser_lock);
 517         list_add(&p->list, &part_parsers);
 518         spin_unlock(&part_parser_lock);
 519
 520         return 0;
 521 }
 522
 523 int deregister_mtd_parser(struct mtd_part_parser *p)
 524 {
 525         spin_lock(&part_parser_lock);
 526         list_del(&p->list);
 527         spin_unlock(&part_parser_lock);
 528         return 0;
 529 }
 530
 531 int parse_mtd_partitions(struct mtd_info *master, const char **types,
 532                          struct mtd_partition **pparts, unsigned long origin)
 533 {
 534         struct mtd_part_parser *parser;
 535         int ret = 0;
 536
 537         for ( ; ret <= 0 && *types; types++) {
 538                 parser = get_partition_parser(*types);
 539 #ifdef CONFIG_KMOD
 540                 if (!parser && !request_module("%s", *types))
 541                                 parser = get_partition_parser(*types);
 542 #endif
 543                 if (!parser) {
 544                         printk(KERN_NOTICE "%s partition parsing not available\n",
 545                                *types);
 546                         continue;
 547                 }
 548                 ret = (*parser->parse_fn)(master, pparts, origin);
 549                 if (ret > 0) {
 550                         printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
 551                                ret, parser->name, master->name);
 552                 }
 553                 put_partition_parser(parser);
 554         }
 555         return ret;
 556 }
 557
 558 EXPORT_SYMBOL_GPL(parse_mtd_partitions);
 559 EXPORT_SYMBOL_GPL(register_mtd_parser);
 560 EXPORT_SYMBOL_GPL(deregister_mtd_parser);
 561
 562 MODULE_LICENSE("GPL");
 563 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
 564 MODULE_DESCRIPTION("Generic support for partitioning of MTD devices");
 565