target/linux/brcm47xx/patches-3.6/050-mtd-add-bcm47xx-part-parser.patch

   1 --- a/drivers/mtd/Kconfig
   2 +++ b/drivers/mtd/Kconfig
   3 @@ -172,6 +172,13 @@ config MTD_MYLOADER_PARTS
   4           You will still need the parsing functions to be called by the driver
   5           for your particular device. It won't happen automatically.
   6
   7 +config MTD_BCM47XX_PARTS
   8 +       tristate "BCM47XX partitioning support"
   9 +       default y
  10 +       depends on BCM47XX
  11 +       ---help---
  12 +         bcm47XX partitioning support
  13 +
  14  comment "User Modules And Translation Layers"
  15
  16  config MTD_CHAR
  17 --- a/drivers/mtd/Makefile
  18 +++ b/drivers/mtd/Makefile
  19 @@ -13,6 +13,7 @@ obj-$(CONFIG_MTD_AFS_PARTS)   += afs.o
  20  obj-$(CONFIG_MTD_AR7_PARTS)    += ar7part.o
  21  obj-$(CONFIG_MTD_BCM63XX_PARTS)        += bcm63xxpart.o
  22  obj-$(CONFIG_MTD_MYLOADER_PARTS) += myloader.o
  23 +obj-$(CONFIG_MTD_BCM47XX_PARTS)        += bcm47xxpart.o
  24
  25  # 'Users' - code which presents functionality to userspace.
  26  obj-$(CONFIG_MTD_CHAR)         += mtdchar.o
  27 --- /dev/null
  28 +++ b/drivers/mtd/bcm47xxpart.c
  29 @@ -0,0 +1,504 @@
  30 +/*
  31 + *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
  32 + *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
  33 + *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
  34 + *
  35 + *  original functions for finding root filesystem from Mike Baker
  36 + *
  37 + *  This program is free software; you can redistribute  it and/or modify it
  38 + *  under  the terms of  the GNU General  Public License as published by the
  39 + *  Free Software Foundation;  either version 2 of the  License, or (at your
  40 + *  option) any later version.
  41 + *
  42 + *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  43 + *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  44 + *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  45 + *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  46 + *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  47 + *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  48 + *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  49 + *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  50 + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  51 + *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  52 + *
  53 + *  You should have received a copy of the  GNU General Public License along
  54 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  55 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  56 + *
  57 + *  Copyright 2001-2003, Broadcom Corporation
  58 + *  All Rights Reserved.
  59 + *
  60 + *  THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
  61 + *  KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
  62 + *  SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  63 + *  FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  64 + *
  65 + *  Flash mapping for BCM947XX boards
  66 + */
  67 +
  68 +#define pr_fmt(fmt) "bcm47xx_part: " fmt
  69 +#include <linux/init.h>
  70 +#include <linux/module.h>
  71 +#include <linux/types.h>
  72 +#include <linux/kernel.h>
  73 +#include <linux/sched.h>
  74 +#include <linux/wait.h>
  75 +#include <linux/mtd/mtd.h>
  76 +#include <linux/mtd/partitions.h>
  77 +#include <linux/crc32.h>
  78 +#include <linux/io.h>
  79 +#include <bcm47xx_nvram.h>
  80 +#include <bcm47xx.h>
  81 +#include <asm/fw/cfe/cfe_api.h>
  82 +#include <bcm47xx_board.h>
  83 +
  84 +
  85 +#define TRX_MAGIC      0x30524448      /* "HDR0" */
  86 +#define TRX_VERSION    1
  87 +#define TRX_MAX_LEN    0x3A0000
  88 +#define TRX_NO_HEADER  1               /* Do not write TRX header */
  89 +#define TRX_GZ_FILES   0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
  90 +#define TRX_MAX_OFFSET 3
  91 +
  92 +struct trx_header {
  93 +       u32 magic;              /* "HDR0" */
  94 +       u32 len;                /* Length of file including header */
  95 +       u32 crc32;              /* 32-bit CRC from flag_version to end of file */
  96 +       u32 flag_version;       /* 0:15 flags, 16:31 version */
  97 +       u32 offsets[TRX_MAX_OFFSET];    /* Offsets of partitions from start of header */
  98 +};
  99 +
 100 +/* for Edimax Print servers which use an additional header
 101 + * then the firmware on flash looks like :
 102 + * EDIMAX HEADER | TRX HEADER
 103 + * As this header is 12 bytes long we have to handle it
 104 + * and skip it to find the TRX header
 105 + */
 106 +#define EDIMAX_PS_HEADER_MAGIC 0x36315350 /*  "PS16"  */
 107 +#define EDIMAX_PS_HEADER_LEN   0xc /* 12 bytes long for edimax header */
 108 +
 109 +#define NVRAM_SPACE 0x8000
 110 +
 111 +static int
 112 +find_cfe_size(struct mtd_info *mtd)
 113 +{
 114 +       struct trx_header *trx;
 115 +       unsigned char buf[512];
 116 +       int off;
 117 +       size_t len;
 118 +       int blocksize;
 119 +
 120 +       trx = (struct trx_header *) buf;
 121 +
 122 +       blocksize = mtd->erasesize;
 123 +       if (blocksize < 0x10000)
 124 +               blocksize = 0x10000;
 125 +
 126 +       for (off = (128*1024); off < mtd->size; off += blocksize) {
 127 +               memset(buf, 0xe5, sizeof(buf));
 128 +
 129 +               /*
 130 +                * Read into buffer
 131 +                */
 132 +               if (mtd_read(mtd, off, sizeof(buf), &len, buf) ||
 133 +                   len != sizeof(buf))
 134 +                       continue;
 135 +
 136 +               if (le32_to_cpu(trx->magic) == EDIMAX_PS_HEADER_MAGIC) {
 137 +                       if (mtd_read(mtd, off + EDIMAX_PS_HEADER_LEN,
 138 +                           sizeof(buf), &len, buf) || len != sizeof(buf)) {
 139 +                               continue;
 140 +                       } else {
 141 +                               pr_notice("Found edimax header\n");
 142 +                       }
 143 +               }
 144 +
 145 +               /* found a TRX header */
 146 +               if (le32_to_cpu(trx->magic) == TRX_MAGIC)
 147 +                       goto found;
 148 +       }
 149 +
 150 +       pr_notice("%s: Couldn't find bootloader size\n", mtd->name);
 151 +       return -1;
 152 +
 153 + found:
 154 +       pr_notice("bootloader size: %d\n", off);
 155 +       return off;
 156 +
 157 +}
 158 +
 159 +/*
 160 + * Copied from mtdblock.c
 161 + *
 162 + * Cache stuff...
 163 + *
 164 + * Since typical flash erasable sectors are much larger than what Linux's
 165 + * buffer cache can handle, we must implement read-modify-write on flash
 166 + * sectors for each block write requests.  To avoid over-erasing flash sectors
 167 + * and to speed things up, we locally cache a whole flash sector while it is
 168 + * being written to until a different sector is required.
 169 + */
 170 +
 171 +static void erase_callback(struct erase_info *done)
 172 +{
 173 +       wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 174 +       wake_up(wait_q);
 175 +}
 176 +
 177 +static int erase_write(struct mtd_info *mtd, unsigned long pos,
 178 +                       int len, const char *buf)
 179 +{
 180 +       struct erase_info erase;
 181 +       DECLARE_WAITQUEUE(wait, current);
 182 +       wait_queue_head_t wait_q;
 183 +       size_t retlen;
 184 +       int ret;
 185 +
 186 +       /*
 187 +        * First, let's erase the flash block.
 188 +        */
 189 +
 190 +       init_waitqueue_head(&wait_q);
 191 +       erase.mtd = mtd;
 192 +       erase.callback = erase_callback;
 193 +       erase.addr = pos;
 194 +       erase.len = len;
 195 +       erase.priv = (u_long)&wait_q;
 196 +
 197 +       set_current_state(TASK_INTERRUPTIBLE);
 198 +       add_wait_queue(&wait_q, &wait);
 199 +
 200 +       ret = mtd_erase(mtd, &erase);
 201 +       if (ret) {
 202 +               set_current_state(TASK_RUNNING);
 203 +               remove_wait_queue(&wait_q, &wait);
 204 +               pr_warn("erase of region [0x%lx, 0x%x] on \"%s\" failed\n",
 205 +                       pos, len, mtd->name);
 206 +               return ret;
 207 +       }
 208 +
 209 +       schedule();  /* Wait for erase to finish. */
 210 +       remove_wait_queue(&wait_q, &wait);
 211 +
 212 +       /*
 213 +        * Next, write data to flash.
 214 +        */
 215 +
 216 +       ret = mtd_write(mtd, pos, len, &retlen, buf);
 217 +       if (ret)
 218 +               return ret;
 219 +       if (retlen != len)
 220 +               return -EIO;
 221 +       return 0;
 222 +}
 223 +
 224 +
 225 +static int
 226 +find_dual_image_off(struct mtd_info *mtd)
 227 +{
 228 +       struct trx_header trx;
 229 +       int off, blocksize;
 230 +       size_t len;
 231 +
 232 +       blocksize = mtd->erasesize;
 233 +       if (blocksize < 0x10000)
 234 +               blocksize = 0x10000;
 235 +
 236 +       for (off = (128*1024); off < mtd->size; off += blocksize) {
 237 +               memset(&trx, 0xe5, sizeof(trx));
 238 +               /*
 239 +               * Read into buffer
 240 +               */
 241 +               if (mtd_read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 242 +                   len != sizeof(trx))
 243 +                       continue;
 244 +               /* found last TRX header */
 245 +               if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 246 +                       if (le32_to_cpu(trx.flag_version >> 16) == 2) {
 247 +                               pr_notice("dual image TRX header found\n");
 248 +                               return mtd->size / 2;
 249 +                       } else {
 250 +                               return 0;
 251 +                       }
 252 +               }
 253 +       }
 254 +       return 0;
 255 +}
 256 +
 257 +
 258 +static int
 259 +find_root(struct mtd_info *mtd, struct mtd_partition *part)
 260 +{
 261 +       struct trx_header trx, *trx2;
 262 +       unsigned char buf[512], *block;
 263 +       int off, blocksize, trxoff = 0;
 264 +       u32 i, crc = ~0;
 265 +       size_t len;
 266 +       bool edimax = false;
 267 +
 268 +       blocksize = mtd->erasesize;
 269 +       if (blocksize < 0x10000)
 270 +               blocksize = 0x10000;
 271 +
 272 +       for (off = (128*1024); off < mtd->size; off += blocksize) {
 273 +               memset(&trx, 0xe5, sizeof(trx));
 274 +
 275 +               /*
 276 +                * Read into buffer
 277 +                */
 278 +               if (mtd_read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 279 +                   len != sizeof(trx))
 280 +                       continue;
 281 +
 282 +               /* found an edimax header */
 283 +               if (le32_to_cpu(trx.magic) == EDIMAX_PS_HEADER_MAGIC) {
 284 +                       /* read the correct trx header */
 285 +                       if (mtd_read(mtd, off + EDIMAX_PS_HEADER_LEN,
 286 +                           sizeof(trx), &len, (char *) &trx) ||
 287 +                           len != sizeof(trx)) {
 288 +                               continue;
 289 +                       } else {
 290 +                               pr_notice("Found an edimax ps header\n");
 291 +                               edimax = true;
 292 +                       }
 293 +               }
 294 +
 295 +               /* found a TRX header */
 296 +               if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 297 +                       part->offset = le32_to_cpu(trx.offsets[2]) ? :
 298 +                               le32_to_cpu(trx.offsets[1]);
 299 +                       part->size = le32_to_cpu(trx.len);
 300 +
 301 +                       part->size -= part->offset;
 302 +                       part->offset += off;
 303 +                       if (edimax) {
 304 +                               off += EDIMAX_PS_HEADER_LEN;
 305 +                               trxoff = EDIMAX_PS_HEADER_LEN;
 306 +                       }
 307 +
 308 +                       goto found;
 309 +               }
 310 +       }
 311 +
 312 +       pr_warn("%s: Couldn't find root filesystem\n",
 313 +              mtd->name);
 314 +       return -1;
 315 +
 316 + found:
 317 +       pr_notice("TRX offset : %x\n", trxoff);
 318 +       if (part->size == 0)
 319 +               return 0;
 320 +
 321 +       if (mtd_read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 322 +               return 0;
 323 +
 324 +       /* Move the fs outside of the trx */
 325 +       part->size = 0;
 326 +
 327 +       if (trx.len != part->offset + part->size - off) {
 328 +               /* Update the trx offsets and length */
 329 +               trx.len = part->offset + part->size - off;
 330 +
 331 +               /* Update the trx crc32 */
 332 +               for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 333 +                       if (mtd_read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 334 +                               return 0;
 335 +                       crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 336 +               }
 337 +               trx.crc32 = crc;
 338 +
 339 +               /* read first eraseblock from the trx */
 340 +               block = kmalloc(mtd->erasesize, GFP_KERNEL);
 341 +               trx2 = (struct trx_header *) block;
 342 +               if (mtd_read(mtd, off - trxoff, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 343 +                       pr_err("Error accessing the first trx eraseblock\n");
 344 +                       return 0;
 345 +               }
 346 +
 347 +               pr_notice("Updating TRX offsets and length:\n");
 348 +               pr_notice("old trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n", trx2->offsets[0], trx2->offsets[1], trx2->offsets[2], trx2->len, trx2->crc32);
 349 +               pr_notice("new trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n",   trx.offsets[0],   trx.offsets[1],   trx.offsets[2],   trx.len, trx.crc32);
 350 +
 351 +               /* Write updated trx header to the flash */
 352 +               memcpy(block + trxoff, &trx, sizeof(trx));
 353 +               if (mtd->_unlock)
 354 +                       mtd->_unlock(mtd, off - trxoff, mtd->erasesize);
 355 +               erase_write(mtd, off - trxoff, mtd->erasesize, block);
 356 +               mtd_sync(mtd);
 357 +               kfree(block);
 358 +               pr_notice("Done\n");
 359 +       }
 360 +
 361 +       return part->size;
 362 +}
 363 +
 364 +static bool is_simpletech_simpleshare(void)
 365 +{
 366 +       char buf[20];
 367 +       u16 boardtype = 0;
 368 +       u16 boardrev = 0;
 369 +       u32 boardflags = 0;
 370 +       u16 strev = 0;
 371 +
 372 +       if (bcm47xx_nvram_getenv("boardtype", buf, sizeof(buf)) >= 0)
 373 +               boardtype = simple_strtoul(buf, NULL, 0);
 374 +       if (bcm47xx_nvram_getenv("boardrev", buf, sizeof(buf)) >= 0)
 375 +               boardrev = simple_strtoul(buf, NULL, 0);
 376 +       if (bcm47xx_nvram_getenv("boardflags", buf, sizeof(buf)) >= 0)
 377 +               boardflags = simple_strtoul(buf, NULL, 0);
 378 +       if (bcm47xx_nvram_getenv("st_rev", buf, sizeof(buf)) >= 0)
 379 +               strev = simple_strtoul(buf, NULL, 0);
 380 +
 381 +       if (boardtype == 0x042f
 382 +         && boardrev == 0x10
 383 +         && boardflags == 0
 384 +         && strev == 0x11) {
 385 +               /* Simpletech Simpleshare */
 386 +               return true;
 387 +       }
 388 +
 389 +       return false;
 390 +}
 391 +
 392 +static int parse_bcm47xx_partitions(struct mtd_info *mtd,
 393 +                                   struct mtd_partition **pparts,
 394 +                                   struct mtd_part_parser_data *data)
 395 +{
 396 +       int cfe_size;
 397 +       int dual_image_offset = 0;
 398 +       /* e.g Netgear 0x003e0000-0x003f0000 : "board_data", we exclude this
 399 +        * part from our mapping to prevent overwriting len/checksum on e.g.
 400 +        * Netgear WGR614v8/L/WW
 401 +        */
 402 +       int custom_data_size = 0;
 403 +       struct mtd_partition *bcm47xx_parts;
 404 +
 405 +       cfe_size = find_cfe_size(mtd);
 406 +       if (cfe_size < 0)
 407 +               return 0;
 408 +
 409 +       bcm47xx_parts = kzalloc(sizeof(struct mtd_partition) * 6, GFP_KERNEL);
 410 +
 411 +       bcm47xx_parts[0].name = "cfe";
 412 +       bcm47xx_parts[1].name = "linux";
 413 +       bcm47xx_parts[2].name = "rootfs";
 414 +       bcm47xx_parts[3].name = "nvram";
 415 +
 416 +       /* boot loader */
 417 +       bcm47xx_parts[0].mask_flags = MTD_WRITEABLE;
 418 +       bcm47xx_parts[0].offset = 0;
 419 +       bcm47xx_parts[0].size   = cfe_size;
 420 +
 421 +       /* nvram */
 422 +       if (cfe_size != 384 * 1024) {
 423 +
 424 +               switch (bcm47xx_board_get()) {
 425 +               case BCM47XX_BOARD_NETGEAR_WGR614V8:
 426 +               case BCM47XX_BOARD_NETGEAR_WGR614V9:
 427 +               case BCM47XX_BOARD_NETGEAR_WNDR3300:
 428 +               case BCM47XX_BOARD_NETGEAR_WNDR3400V1:
 429 +               case BCM47XX_BOARD_NETGEAR_WNDR3400V2:
 430 +               case BCM47XX_BOARD_NETGEAR_WNDR3400VCNA:
 431 +               case BCM47XX_BOARD_NETGEAR_WNDR3700V3:
 432 +               case BCM47XX_BOARD_NETGEAR_WNDR4000:
 433 +               case BCM47XX_BOARD_NETGEAR_WNDR4500:
 434 +               case BCM47XX_BOARD_NETGEAR_WNR2000:
 435 +               case BCM47XX_BOARD_NETGEAR_WNR3500L:
 436 +               case BCM47XX_BOARD_NETGEAR_WNR3500U:
 437 +               case BCM47XX_BOARD_NETGEAR_WNR3500V2:
 438 +               case BCM47XX_BOARD_NETGEAR_WNR3500V2VC:
 439 +               case BCM47XX_BOARD_NETGEAR_WNR834BV2:
 440 +                       /* Netgear: checksum is @ 0x003AFFF8 for 4M flash or checksum
 441 +                        * is @ 0x007AFFF8 for 8M flash
 442 +                        */
 443 +                       custom_data_size = mtd->erasesize;
 444 +
 445 +                       bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
 446 +                       bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 447 +
 448 +                       /* Place CFE board_data into a partition */
 449 +                       bcm47xx_parts[4].name = "board_data";
 450 +                       bcm47xx_parts[4].offset = bcm47xx_parts[3].offset - custom_data_size;
 451 +                       bcm47xx_parts[4].size   = custom_data_size;
 452 +                       break;
 453 +
 454 +               default:
 455 +                       if (is_simpletech_simpleshare()) {
 456 +                               /* Fixup Simpletech Simple share nvram  */
 457 +
 458 +                               pr_notice("Setting up simpletech nvram\n");
 459 +                               custom_data_size = mtd->erasesize;
 460 +
 461 +                               bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize) * 2;
 462 +                               bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 463 +
 464 +                               /* Place backup nvram into a partition */
 465 +                               bcm47xx_parts[4].name = "nvram_copy";
 466 +                               bcm47xx_parts[4].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
 467 +                               bcm47xx_parts[4].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 468 +                       } else {
 469 +                               bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
 470 +                               bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 471 +                       }
 472 +               }
 473 +
 474 +       } else {
 475 +               /* nvram (old 128kb config partition on netgear wgt634u) */
 476 +               bcm47xx_parts[3].offset = bcm47xx_parts[0].size;
 477 +               bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 478 +       }
 479 +
 480 +       /* dual image offset*/
 481 +       pr_notice("Looking for dual image\n");
 482 +       dual_image_offset = find_dual_image_off(mtd);
 483 +       /* linux (kernel and rootfs) */
 484 +       if (cfe_size != 384 * 1024) {
 485 +               if (is_simpletech_simpleshare()) {
 486 +                       bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
 487 +                       bcm47xx_parts[1].size   = bcm47xx_parts[4].offset - dual_image_offset -
 488 +                               bcm47xx_parts[1].offset - custom_data_size;
 489 +               } else {
 490 +                       bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
 491 +                       bcm47xx_parts[1].size   = bcm47xx_parts[3].offset - dual_image_offset -
 492 +                               bcm47xx_parts[1].offset - custom_data_size;
 493 +               }
 494 +       } else {
 495 +               /* do not count the elf loader, which is on one block */
 496 +               bcm47xx_parts[1].offset = bcm47xx_parts[0].size +
 497 +                       bcm47xx_parts[3].size + mtd->erasesize;
 498 +               bcm47xx_parts[1].size   = mtd->size -
 499 +                       bcm47xx_parts[0].size -
 500 +                       (2*bcm47xx_parts[3].size) -
 501 +                       mtd->erasesize - custom_data_size;
 502 +       }
 503 +
 504 +       /* find and size rootfs */
 505 +       find_root(mtd, &bcm47xx_parts[2]);
 506 +       bcm47xx_parts[2].size = mtd->size - dual_image_offset -
 507 +                               bcm47xx_parts[2].offset -
 508 +                               bcm47xx_parts[3].size - custom_data_size;
 509 +       *pparts = bcm47xx_parts;
 510 +       return bcm47xx_parts[4].name == NULL ? 4 : 5;
 511 +}
 512 +
 513 +static struct mtd_part_parser bcm47xx_parser = {
 514 +       .owner = THIS_MODULE,
 515 +       .parse_fn = parse_bcm47xx_partitions,
 516 +       .name = "bcm47xx",
 517 +};
 518 +
 519 +static int __init bcm47xx_parser_init(void)
 520 +{
 521 +       return register_mtd_parser(&bcm47xx_parser);
 522 +}
 523 +
 524 +static void __exit bcm47xx_parser_exit(void)
 525 +{
 526 +       deregister_mtd_parser(&bcm47xx_parser);
 527 +}
 528 +
 529 +module_init(bcm47xx_parser_init);
 530 +module_exit(bcm47xx_parser_exit);
 531 +
 532 +MODULE_LICENSE("GPL");
 533 +MODULE_DESCRIPTION("Parsing code for flash partitions on bcm47xx SoCs");