drivers/mtd/mtdpart.c

   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 struct 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         uint64_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         struct mtd_ecc_stats stats;
  52         int res;
  53
  54         stats = part->master->ecc_stats;
  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 += part->master->ecc_stats.corrected - stats.corrected;
  65                 if (res == -EBADMSG)
  66                         mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed;
  67         }
  68         return res;
  69 }
  70
  71 static int part_read_oob(struct mtd_info *mtd, loff_t from,
  72                 struct mtd_oob_ops *ops)
  73 {
  74         struct mtd_part *part = PART(mtd);
  75         int res;
  76
  77         if (from >= mtd->size)
  78                 return -EINVAL;
  79         if (ops->datbuf && from + ops->len > mtd->size)
  80                 return -EINVAL;
  81         res = part->master->read_oob(part->master, from + part->offset, ops);
  82
  83         if (unlikely(res)) {
  84                 if (res == -EUCLEAN)
  85                         mtd->ecc_stats.corrected++;
  86                 if (res == -EBADMSG)
  87                         mtd->ecc_stats.failed++;
  88         }
  89         return res;
  90 }
  91
  92 static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
  93                 size_t len, size_t *retlen, u_char *buf)
  94 {
  95         struct mtd_part *part = PART(mtd);
  96         return part->master->read_user_prot_reg(part->master, from,
  97                                         len, retlen, buf);
  98 }
  99
 100 static int part_get_user_prot_info(struct mtd_info *mtd,
 101                 struct otp_info *buf, size_t len)
 102 {
 103         struct mtd_part *part = PART(mtd);
 104         return part->master->get_user_prot_info(part->master, buf, len);
 105 }
 106
 107 static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
 108                 size_t len, size_t *retlen, u_char *buf)
 109 {
 110         struct mtd_part *part = PART(mtd);
 111         return part->master->read_fact_prot_reg(part->master, from,
 112                                         len, retlen, buf);
 113 }
 114
 115 static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
 116                 size_t len)
 117 {
 118         struct mtd_part *part = PART(mtd);
 119         return part->master->get_fact_prot_info(part->master, buf, len);
 120 }
 121
 122 static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
 123                 size_t *retlen, const u_char *buf)
 124 {
 125         struct mtd_part *part = PART(mtd);
 126         if (!(mtd->flags & MTD_WRITEABLE))
 127                 return -EROFS;
 128         if (to >= mtd->size)
 129                 len = 0;
 130         else if (to + len > mtd->size)
 131                 len = mtd->size - to;
 132         return part->master->write(part->master, to + part->offset,
 133                                     len, retlen, buf);
 134 }
 135
 136 static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
 137                 size_t *retlen, const u_char *buf)
 138 {
 139         struct mtd_part *part = PART(mtd);
 140         if (!(mtd->flags & MTD_WRITEABLE))
 141                 return -EROFS;
 142         if (to >= mtd->size)
 143                 len = 0;
 144         else if (to + len > mtd->size)
 145                 len = mtd->size - to;
 146         return part->master->panic_write(part->master, to + part->offset,
 147                                     len, retlen, buf);
 148 }
 149
 150 static int part_write_oob(struct mtd_info *mtd, loff_t to,
 151                 struct mtd_oob_ops *ops)
 152 {
 153         struct mtd_part *part = PART(mtd);
 154
 155         if (!(mtd->flags & MTD_WRITEABLE))
 156                 return -EROFS;
 157
 158         if (to >= mtd->size)
 159                 return -EINVAL;
 160         if (ops->datbuf && to + ops->len > mtd->size)
 161                 return -EINVAL;
 162         return part->master->write_oob(part->master, to + part->offset, ops);
 163 }
 164
 165 static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
 166                 size_t len, size_t *retlen, u_char *buf)
 167 {
 168         struct mtd_part *part = PART(mtd);
 169         return part->master->write_user_prot_reg(part->master, from,
 170                                         len, retlen, buf);
 171 }
 172
 173 static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
 174                 size_t len)
 175 {
 176         struct mtd_part *part = PART(mtd);
 177         return part->master->lock_user_prot_reg(part->master, from, len);
 178 }
 179
 180 static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
 181 {
 182         struct mtd_part *part = PART(mtd);
 183         int ret;
 184         if (!(mtd->flags & MTD_WRITEABLE))
 185                 return -EROFS;
 186         if (instr->addr >= mtd->size)
 187                 return -EINVAL;
 188         instr->addr += part->offset;
 189         ret = part->master->erase(part->master, instr);
 190         if (ret) {
 191                 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
 192                         instr->fail_addr -= part->offset;
 193                 instr->addr -= part->offset;
 194         }
 195         return ret;
 196 }
 197
 198 void mtd_erase_callback(struct erase_info *instr)
 199 {
 200         if (instr->mtd->erase == part_erase) {
 201                 struct mtd_part *part = PART(instr->mtd);
 202
 203                 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
 204                         instr->fail_addr -= part->offset;
 205                 instr->addr -= part->offset;
 206         }
 207         if (instr->callback)
 208                 instr->callback(instr);
 209 }
 210
 211 static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 212 {
 213         struct mtd_part *part = PART(mtd);
 214         if ((len + ofs) > mtd->size)
 215                 return -EINVAL;
 216         return part->master->lock(part->master, ofs + part->offset, len);
 217 }
 218
 219 static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 220 {
 221         struct mtd_part *part = PART(mtd);
 222         if ((len + ofs) > mtd->size)
 223                 return -EINVAL;
 224         return part->master->unlock(part->master, ofs + part->offset, len);
 225 }
 226
 227 static void part_sync(struct mtd_info *mtd)
 228 {
 229         struct mtd_part *part = PART(mtd);
 230         part->master->sync(part->master);
 231 }
 232
 233 static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
 234 {
 235         struct mtd_part *part = PART(mtd);
 236         if (ofs >= mtd->size)
 237                 return -EINVAL;
 238         ofs += part->offset;
 239         return part->master->block_isbad(part->master, ofs);
 240 }
 241
 242 static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
 243 {
 244         struct mtd_part *part = PART(mtd);
 245         int res;
 246
 247         if (!(mtd->flags & MTD_WRITEABLE))
 248                 return -EROFS;
 249         if (ofs >= mtd->size)
 250                 return -EINVAL;
 251         ofs += part->offset;
 252         res = part->master->block_markbad(part->master, ofs);
 253         if (!res)
 254                 mtd->ecc_stats.badblocks++;
 255         return res;
 256 }
 257
 258 /*
 259  * This function unregisters and destroy all slave MTD objects which are
 260  * attached to the given master MTD object.
 261  */
 262
 263 int del_mtd_partitions(struct mtd_info *master)
 264 {
 265         struct mtd_part *slave, *next;
 266
 267         list_for_each_entry_safe(slave, next, &mtd_partitions, list)
 268                 if (slave->master == master) {
 269                         list_del(&slave->list);
 270                         if (slave->registered)
 271                                 del_mtd_device(&slave->mtd);
 272                         kfree(slave);
 273                 }
 274
 275         return 0;
 276 }
 277
 278 static struct mtd_part *add_one_partition(struct mtd_info *master,
 279                 const struct mtd_partition *part, int partno,
 280                 uint64_t cur_offset)
 281 {
 282         struct mtd_part *slave;
 283
 284         /* allocate the partition structure */
 285         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
 286         if (!slave) {
 287                 printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
 288                         master->name);
 289                 del_mtd_partitions(master);
 290                 return NULL;
 291         }
 292         list_add(&slave->list, &mtd_partitions);
 293
 294         /* set up the MTD object for this partition */
 295         slave->mtd.type = master->type;
 296         slave->mtd.flags = master->flags & ~part->mask_flags;
 297         slave->mtd.size = part->size;
 298         slave->mtd.writesize = master->writesize;
 299         slave->mtd.oobsize = master->oobsize;
 300         slave->mtd.oobavail = master->oobavail;
 301         slave->mtd.subpage_sft = master->subpage_sft;
 302
 303         slave->mtd.name = part->name;
 304         slave->mtd.owner = master->owner;
 305
 306         slave->mtd.read = part_read;
 307         slave->mtd.write = part_write;
 308
 309         if (master->panic_write)
 310                 slave->mtd.panic_write = part_panic_write;
 311
 312         if (master->read_oob)
 313                 slave->mtd.read_oob = part_read_oob;
 314         if (master->write_oob)
 315                 slave->mtd.write_oob = part_write_oob;
 316         if (master->read_user_prot_reg)
 317                 slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
 318         if (master->read_fact_prot_reg)
 319                 slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
 320         if (master->write_user_prot_reg)
 321                 slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
 322         if (master->lock_user_prot_reg)
 323                 slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
 324         if (master->get_user_prot_info)
 325                 slave->mtd.get_user_prot_info = part_get_user_prot_info;
 326         if (master->get_fact_prot_info)
 327                 slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
 328         if (master->sync)
 329                 slave->mtd.sync = part_sync;
 330         if (master->lock)
 331                 slave->mtd.lock = part_lock;
 332         if (master->unlock)
 333                 slave->mtd.unlock = part_unlock;
 334         if (master->block_isbad)
 335                 slave->mtd.block_isbad = part_block_isbad;
 336         if (master->block_markbad)
 337                 slave->mtd.block_markbad = part_block_markbad;
 338         slave->mtd.erase = part_erase;
 339         slave->master = master;
 340         slave->offset = part->offset;
 341         slave->index = partno;
 342
 343         if (slave->offset == MTDPART_OFS_APPEND)
 344                 slave->offset = cur_offset;
 345         if (slave->offset == MTDPART_OFS_NXTBLK) {
 346                 slave->offset = cur_offset;
 347                 if (mtd_mod_by_eb(cur_offset, master) != 0) {
 348                         /* Round up to next erasesize */
 349                         slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
 350                         printk(KERN_NOTICE "Moving partition %d: "
 351                                "0x%012llx -> 0x%012llx\n", partno,
 352                                (unsigned long long)cur_offset, (unsigned long long)slave->offset);
 353                 }
 354         }
 355         if (slave->mtd.size == MTDPART_SIZ_FULL)
 356                 slave->mtd.size = master->size - slave->offset;
 357
 358         printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
 359                 (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
 360
 361         /* let's do some sanity checks */
 362         if (slave->offset >= master->size) {
 363                 /* let's register it anyway to preserve ordering */
 364                 slave->offset = 0;
 365                 slave->mtd.size = 0;
 366                 printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
 367                         part->name);
 368                 goto out_register;
 369         }
 370         if (slave->offset + slave->mtd.size > master->size) {
 371                 slave->mtd.size = master->size - slave->offset;
 372                 printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
 373                         part->name, master->name, (unsigned long long)slave->mtd.size);
 374         }
 375         if (master->numeraseregions > 1) {
 376                 /* Deal with variable erase size stuff */
 377                 int i, max = master->numeraseregions;
 378                 u64 end = slave->offset + slave->mtd.size;
 379                 struct mtd_erase_region_info *regions = master->eraseregions;
 380
 381                 /* Find the first erase regions which is part of this
 382                  * partition. */
 383                 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
 384                         ;
 385                 /* The loop searched for the region _behind_ the first one */
 386                 i--;
 387
 388                 /* Pick biggest erasesize */
 389                 for (; i < max && regions[i].offset < end; i++) {
 390                         if (slave->mtd.erasesize < regions[i].erasesize) {
 391                                 slave->mtd.erasesize = regions[i].erasesize;
 392                         }
 393                 }
 394                 BUG_ON(slave->mtd.erasesize == 0);
 395         } else {
 396                 /* Single erase size */
 397                 slave->mtd.erasesize = master->erasesize;
 398         }
 399
 400         if ((slave->mtd.flags & MTD_WRITEABLE) &&
 401             mtd_mod_by_eb(slave->offset, &slave->mtd)) {
 402                 /* Doesn't start on a boundary of major erase size */
 403                 /* FIXME: Let it be writable if it is on a boundary of
 404                  * _minor_ erase size though */
 405                 slave->mtd.flags &= ~MTD_WRITEABLE;
 406                 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 407                         part->name);
 408         }
 409         if ((slave->mtd.flags & MTD_WRITEABLE) &&
 410             mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
 411                 slave->mtd.flags &= ~MTD_WRITEABLE;
 412                 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 413                         part->name);
 414         }
 415
 416         slave->mtd.ecclayout = master->ecclayout;
 417         if (master->block_isbad) {
 418                 uint64_t offs = 0;
 419
 420                 while (offs < slave->mtd.size) {
 421                         if (master->block_isbad(master,
 422                                                 offs + slave->offset))
 423                                 slave->mtd.ecc_stats.badblocks++;
 424                         offs += slave->mtd.erasesize;
 425                 }
 426         }
 427
 428 out_register:
 429         if (part->mtdp) {
 430                 /* store the object pointer (caller may or may not register it*/
 431                 *part->mtdp = &slave->mtd;
 432                 slave->registered = 0;
 433         } else {
 434                 /* register our partition */
 435                 add_mtd_device(&slave->mtd);
 436                 slave->registered = 1;
 437         }
 438         return slave;
 439 }
 440
 441 /*
 442  * This function, given a master MTD object and a partition table, creates
 443  * and registers slave MTD objects which are bound to the master according to
 444  * the partition definitions.
 445  *
 446  * We don't register the master, or expect the caller to have done so,
 447  * for reasons of data integrity.
 448  */
 449
 450 int add_mtd_partitions(struct mtd_info *master,
 451                        const struct mtd_partition *parts,
 452                        int nbparts)
 453 {
 454         struct mtd_part *slave;
 455         uint64_t cur_offset = 0;
 456         int i;
 457
 458         /*
 459          * Need to init the list here, since LIST_INIT() does not
 460          * work on platforms where relocation has problems (like MIPS
 461          * & PPC).
 462          */
 463         if (mtd_partitions.next == NULL)
 464                 INIT_LIST_HEAD(&mtd_partitions);
 465
 466         printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 467
 468         for (i = 0; i < nbparts; i++) {
 469                 slave = add_one_partition(master, parts + i, i, cur_offset);
 470                 if (!slave)
 471                         return -ENOMEM;
 472                 cur_offset = slave->offset + slave->mtd.size;
 473         }
 474
 475         return 0;
 476 }