target/linux/brcm47xx/patches-3.2/025-mtd-bcm47xx-add-bcm47xx-part-parser.patch

   1 From d50d2d8e3ab5446f791deff0cb78820989ed93e7 Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Sun, 17 Jul 2011 14:54:11 +0200
   4 Subject: [PATCH 06/19] mtd: bcm47xx: add bcm47xx part parser
   5
   6
   7 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
   8 ---
   9  drivers/mtd/Kconfig       |    7 +
  10  drivers/mtd/Makefile      |    1 +
  11  drivers/mtd/bcm47xxpart.c |  542 +++++++++++++++++++++++++++++++++++++++++++++
  12  3 files changed, 550 insertions(+), 0 deletions(-)
  13  create mode 100644 drivers/mtd/bcm47xxpart.c
  14
  15 --- a/drivers/mtd/Kconfig
  16 +++ b/drivers/mtd/Kconfig
  17 @@ -164,6 +164,13 @@ config MTD_MYLOADER_PARTS
  18           You will still need the parsing functions to be called by the driver
  19           for your particular device. It won't happen automatically.
  20
  21 +config MTD_BCM47XX_PARTS
  22 +       tristate "BCM47XX partitioning support"
  23 +       default y
  24 +       depends on BCM47XX
  25 +       ---help---
  26 +         bcm47XX partitioning support
  27 +
  28  comment "User Modules And Translation Layers"
  29
  30  config MTD_CHAR
  31 --- a/drivers/mtd/Makefile
  32 +++ b/drivers/mtd/Makefile
  33 @@ -12,6 +12,7 @@ obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdli
  34  obj-$(CONFIG_MTD_AFS_PARTS)    += afs.o
  35  obj-$(CONFIG_MTD_AR7_PARTS)    += ar7part.o
  36  obj-$(CONFIG_MTD_MYLOADER_PARTS) += myloader.o
  37 +obj-$(CONFIG_MTD_BCM47XX_PARTS)        += bcm47xxpart.o
  38
  39  # 'Users' - code which presents functionality to userspace.
  40  obj-$(CONFIG_MTD_CHAR)         += mtdchar.o
  41 --- /dev/null
  42 +++ b/drivers/mtd/bcm47xxpart.c
  43 @@ -0,0 +1,542 @@
  44 +/*
  45 + *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
  46 + *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
  47 + *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
  48 + *
  49 + *  original functions for finding root filesystem from Mike Baker
  50 + *
  51 + *  This program is free software; you can redistribute  it and/or modify it
  52 + *  under  the terms of  the GNU General  Public License as published by the
  53 + *  Free Software Foundation;  either version 2 of the  License, or (at your
  54 + *  option) any later version.
  55 + *
  56 + *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  57 + *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  58 + *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  59 + *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  60 + *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  61 + *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  62 + *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  63 + *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  64 + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  65 + *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  66 + *
  67 + *  You should have received a copy of the  GNU General Public License along
  68 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  69 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  70 + *
  71 + *  Copyright 2001-2003, Broadcom Corporation
  72 + *  All Rights Reserved.
  73 + *
  74 + *  THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
  75 + *  KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
  76 + *  SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  77 + *  FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  78 + *
  79 + *  Flash mapping for BCM947XX boards
  80 + */
  81 +
  82 +#define pr_fmt(fmt) "bcm47xx_part: " fmt
  83 +#include <linux/init.h>
  84 +#include <linux/module.h>
  85 +#include <linux/types.h>
  86 +#include <linux/kernel.h>
  87 +#include <linux/sched.h>
  88 +#include <linux/wait.h>
  89 +#include <linux/mtd/mtd.h>
  90 +#include <linux/mtd/partitions.h>
  91 +#include <linux/crc32.h>
  92 +#include <linux/io.h>
  93 +#include <asm/mach-bcm47xx/nvram.h>
  94 +#include <asm/mach-bcm47xx/bcm47xx.h>
  95 +#include <asm/fw/cfe/cfe_api.h>
  96 +
  97 +
  98 +#define TRX_MAGIC      0x30524448      /* "HDR0" */
  99 +#define TRX_VERSION    1
 100 +#define TRX_MAX_LEN    0x3A0000
 101 +#define TRX_NO_HEADER  1               /* Do not write TRX header */
 102 +#define TRX_GZ_FILES   0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
 103 +#define TRX_MAX_OFFSET 3
 104 +
 105 +struct trx_header {
 106 +       u32 magic;              /* "HDR0" */
 107 +       u32 len;                /* Length of file including header */
 108 +       u32 crc32;              /* 32-bit CRC from flag_version to end of file */
 109 +       u32 flag_version;       /* 0:15 flags, 16:31 version */
 110 +       u32 offsets[TRX_MAX_OFFSET];    /* Offsets of partitions from start of header */
 111 +};
 112 +
 113 +/* for Edimax Print servers which use an additional header
 114 + * then the firmware on flash looks like :
 115 + * EDIMAX HEADER | TRX HEADER
 116 + * As this header is 12 bytes long we have to handle it
 117 + * and skip it to find the TRX header
 118 + */
 119 +#define EDIMAX_PS_HEADER_MAGIC 0x36315350 /*  "PS16"  */
 120 +#define EDIMAX_PS_HEADER_LEN   0xc /* 12 bytes long for edimax header */
 121 +
 122 +#define NVRAM_SPACE 0x8000
 123 +
 124 +#define ROUTER_NETGEAR_WGR614L         1
 125 +#define ROUTER_NETGEAR_WNR834B         2
 126 +#define ROUTER_NETGEAR_WNDR3300                3
 127 +#define ROUTER_NETGEAR_WNR3500L                4
 128 +#define ROUTER_SIMPLETECH_SIMPLESHARE  5
 129 +#define ROUTER_NETGEAR_WNDR3400                6
 130 +
 131 +static int
 132 +find_cfe_size(struct mtd_info *mtd)
 133 +{
 134 +       struct trx_header *trx;
 135 +       unsigned char buf[512];
 136 +       int off;
 137 +       size_t len;
 138 +       int blocksize;
 139 +
 140 +       trx = (struct trx_header *) buf;
 141 +
 142 +       blocksize = mtd->erasesize;
 143 +       if (blocksize < 0x10000)
 144 +               blocksize = 0x10000;
 145 +
 146 +       for (off = (128*1024); off < mtd->size; off += blocksize) {
 147 +               memset(buf, 0xe5, sizeof(buf));
 148 +
 149 +               /*
 150 +                * Read into buffer
 151 +                */
 152 +               if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
 153 +                   len != sizeof(buf))
 154 +                       continue;
 155 +
 156 +               if (le32_to_cpu(trx->magic) == EDIMAX_PS_HEADER_MAGIC) {
 157 +                       if (mtd->read(mtd, off + EDIMAX_PS_HEADER_LEN,
 158 +                           sizeof(buf), &len, buf) || len != sizeof(buf)) {
 159 +                               continue;
 160 +                       } else {
 161 +                               pr_notice("Found edimax header\n");
 162 +                       }
 163 +               }
 164 +
 165 +               /* found a TRX header */
 166 +               if (le32_to_cpu(trx->magic) == TRX_MAGIC)
 167 +                       goto found;
 168 +       }
 169 +
 170 +       pr_notice("%s: Couldn't find bootloader size\n", mtd->name);
 171 +       return -1;
 172 +
 173 + found:
 174 +       pr_notice("bootloader size: %d\n", off);
 175 +       return off;
 176 +
 177 +}
 178 +
 179 +/*
 180 + * Copied from mtdblock.c
 181 + *
 182 + * Cache stuff...
 183 + *
 184 + * Since typical flash erasable sectors are much larger than what Linux's
 185 + * buffer cache can handle, we must implement read-modify-write on flash
 186 + * sectors for each block write requests.  To avoid over-erasing flash sectors
 187 + * and to speed things up, we locally cache a whole flash sector while it is
 188 + * being written to until a different sector is required.
 189 + */
 190 +
 191 +static void erase_callback(struct erase_info *done)
 192 +{
 193 +       wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 194 +       wake_up(wait_q);
 195 +}
 196 +
 197 +static int erase_write(struct mtd_info *mtd, unsigned long pos,
 198 +                       int len, const char *buf)
 199 +{
 200 +       struct erase_info erase;
 201 +       DECLARE_WAITQUEUE(wait, current);
 202 +       wait_queue_head_t wait_q;
 203 +       size_t retlen;
 204 +       int ret;
 205 +
 206 +       /*
 207 +        * First, let's erase the flash block.
 208 +        */
 209 +
 210 +       init_waitqueue_head(&wait_q);
 211 +       erase.mtd = mtd;
 212 +       erase.callback = erase_callback;
 213 +       erase.addr = pos;
 214 +       erase.len = len;
 215 +       erase.priv = (u_long)&wait_q;
 216 +
 217 +       set_current_state(TASK_INTERRUPTIBLE);
 218 +       add_wait_queue(&wait_q, &wait);
 219 +
 220 +       ret = mtd->erase(mtd, &erase);
 221 +       if (ret) {
 222 +               set_current_state(TASK_RUNNING);
 223 +               remove_wait_queue(&wait_q, &wait);
 224 +               pr_warn("erase of region [0x%lx, 0x%x] on \"%s\" failed\n",
 225 +                       pos, len, mtd->name);
 226 +               return ret;
 227 +       }
 228 +
 229 +       schedule();  /* Wait for erase to finish. */
 230 +       remove_wait_queue(&wait_q, &wait);
 231 +
 232 +       /*
 233 +        * Next, write data to flash.
 234 +        */
 235 +
 236 +       ret = mtd->write(mtd, pos, len, &retlen, buf);
 237 +       if (ret)
 238 +               return ret;
 239 +       if (retlen != len)
 240 +               return -EIO;
 241 +       return 0;
 242 +}
 243 +
 244 +
 245 +static int
 246 +find_dual_image_off(struct mtd_info *mtd)
 247 +{
 248 +       struct trx_header trx;
 249 +       int off, blocksize;
 250 +       size_t len;
 251 +
 252 +       blocksize = mtd->erasesize;
 253 +       if (blocksize < 0x10000)
 254 +               blocksize = 0x10000;
 255 +
 256 +       for (off = (128*1024); off < mtd->size; off += blocksize) {
 257 +               memset(&trx, 0xe5, sizeof(trx));
 258 +               /*
 259 +               * Read into buffer
 260 +               */
 261 +               if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 262 +                   len != sizeof(trx))
 263 +                       continue;
 264 +               /* found last TRX header */
 265 +               if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 266 +                       if (le32_to_cpu(trx.flag_version >> 16) == 2) {
 267 +                               pr_notice("dual image TRX header found\n");
 268 +                               return mtd->size / 2;
 269 +                       } else {
 270 +                               return 0;
 271 +                       }
 272 +               }
 273 +       }
 274 +       return 0;
 275 +}
 276 +
 277 +
 278 +static int
 279 +find_root(struct mtd_info *mtd, struct mtd_partition *part)
 280 +{
 281 +       struct trx_header trx, *trx2;
 282 +       unsigned char buf[512], *block;
 283 +       int off, blocksize, trxoff = 0;
 284 +       u32 i, crc = ~0;
 285 +       size_t len;
 286 +       bool edimax = false;
 287 +
 288 +       blocksize = mtd->erasesize;
 289 +       if (blocksize < 0x10000)
 290 +               blocksize = 0x10000;
 291 +
 292 +       for (off = (128*1024); off < mtd->size; off += blocksize) {
 293 +               memset(&trx, 0xe5, sizeof(trx));
 294 +
 295 +               /*
 296 +                * Read into buffer
 297 +                */
 298 +               if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 299 +                   len != sizeof(trx))
 300 +                       continue;
 301 +
 302 +               /* found an edimax header */
 303 +               if (le32_to_cpu(trx.magic) == EDIMAX_PS_HEADER_MAGIC) {
 304 +                       /* read the correct trx header */
 305 +                       if (mtd->read(mtd, off + EDIMAX_PS_HEADER_LEN,
 306 +                           sizeof(trx), &len, (char *) &trx) ||
 307 +                           len != sizeof(trx)) {
 308 +                               continue;
 309 +                       } else {
 310 +                               pr_notice("Found an edimax ps header\n");
 311 +                               edimax = true;
 312 +                       }
 313 +               }
 314 +
 315 +               /* found a TRX header */
 316 +               if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 317 +                       part->offset = le32_to_cpu(trx.offsets[2]) ? :
 318 +                               le32_to_cpu(trx.offsets[1]);
 319 +                       part->size = le32_to_cpu(trx.len);
 320 +
 321 +                       part->size -= part->offset;
 322 +                       part->offset += off;
 323 +                       if (edimax) {
 324 +                               off += EDIMAX_PS_HEADER_LEN;
 325 +                               trxoff = EDIMAX_PS_HEADER_LEN;
 326 +                       }
 327 +
 328 +                       goto found;
 329 +               }
 330 +       }
 331 +
 332 +       pr_warn("%s: Couldn't find root filesystem\n",
 333 +              mtd->name);
 334 +       return -1;
 335 +
 336 + found:
 337 +       pr_notice("TRX offset : %x\n", trxoff);
 338 +       if (part->size == 0)
 339 +               return 0;
 340 +
 341 +       if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 342 +               return 0;
 343 +
 344 +       /* Move the fs outside of the trx */
 345 +       part->size = 0;
 346 +
 347 +       if (trx.len != part->offset + part->size - off) {
 348 +               /* Update the trx offsets and length */
 349 +               trx.len = part->offset + part->size - off;
 350 +
 351 +               /* Update the trx crc32 */
 352 +               for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 353 +                       if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 354 +                               return 0;
 355 +                       crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 356 +               }
 357 +               trx.crc32 = crc;
 358 +
 359 +               /* read first eraseblock from the trx */
 360 +               block = kmalloc(mtd->erasesize, GFP_KERNEL);
 361 +               trx2 = (struct trx_header *) block;
 362 +               if (mtd->read(mtd, off - trxoff, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 363 +                       pr_err("Error accessing the first trx eraseblock\n");
 364 +                       return 0;
 365 +               }
 366 +
 367 +               pr_notice("Updating TRX offsets and length:\n");
 368 +               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);
 369 +               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);
 370 +
 371 +               /* Write updated trx header to the flash */
 372 +               memcpy(block + trxoff, &trx, sizeof(trx));
 373 +               if (mtd->unlock)
 374 +                       mtd->unlock(mtd, off - trxoff, mtd->erasesize);
 375 +               erase_write(mtd, off - trxoff, mtd->erasesize, block);
 376 +               if (mtd->sync)
 377 +                       mtd->sync(mtd);
 378 +               kfree(block);
 379 +               pr_notice("Done\n");
 380 +       }
 381 +
 382 +       return part->size;
 383 +}
 384 +
 385 +static int get_router(void)
 386 +{
 387 +       char buf[20];
 388 +       u32 boardnum = 0;
 389 +       u16 boardtype = 0;
 390 +       u16 boardrev = 0;
 391 +       u32 boardflags = 0;
 392 +       u16 sdram_init = 0;
 393 +       u16 cardbus = 0;
 394 +       u16 strev = 0;
 395 +
 396 +       if (nvram_getenv("boardnum", buf, sizeof(buf)) >= 0)
 397 +               boardnum = simple_strtoul(buf, NULL, 0);
 398 +       if (nvram_getenv("boardtype", buf, sizeof(buf)) >= 0)
 399 +               boardtype = simple_strtoul(buf, NULL, 0);
 400 +       if (nvram_getenv("boardrev", buf, sizeof(buf)) >= 0)
 401 +               boardrev = simple_strtoul(buf, NULL, 0);
 402 +       if (nvram_getenv("boardflags", buf, sizeof(buf)) >= 0)
 403 +               boardflags = simple_strtoul(buf, NULL, 0);
 404 +       if (nvram_getenv("sdram_init", buf, sizeof(buf)) >= 0)
 405 +               sdram_init = simple_strtoul(buf, NULL, 0);
 406 +       if (nvram_getenv("cardbus", buf, sizeof(buf)) >= 0)
 407 +               cardbus = simple_strtoul(buf, NULL, 0);
 408 +       if (nvram_getenv("st_rev", buf, sizeof(buf)) >= 0)
 409 +               strev = simple_strtoul(buf, NULL, 0);
 410 +
 411 +       if ((boardnum == 8 || boardnum == 01)
 412 +         && boardtype == 0x0472 && cardbus == 1) {
 413 +               /* Netgear WNR834B, Netgear WNR834Bv2 */
 414 +               return ROUTER_NETGEAR_WNR834B;
 415 +       }
 416 +
 417 +       if (boardnum == 01 && boardtype == 0x0472 && boardrev == 0x23) {
 418 +               /* Netgear WNDR-3300 */
 419 +               return ROUTER_NETGEAR_WNDR3300;
 420 +       }
 421 +
 422 +       if ((boardnum == 83258 || boardnum == 01)
 423 +         && boardtype == 0x048e
 424 +         && (boardrev == 0x11 || boardrev == 0x10)
 425 +         && boardflags == 0x750
 426 +         && sdram_init == 0x000A) {
 427 +               /* Netgear WGR614v8/L/WW 16MB ram, cfe v1.3 or v1.5 */
 428 +               return ROUTER_NETGEAR_WGR614L;
 429 +       }
 430 +
 431 +       if ((boardnum == 1 || boardnum == 3500)
 432 +         && boardtype == 0x04CF
 433 +         && (boardrev == 0x1213 || boardrev == 02)) {
 434 +               /* Netgear WNR3500v2/U/L */
 435 +               return ROUTER_NETGEAR_WNR3500L;
 436 +       }
 437 +
 438 +       if (boardnum == 1 && boardtype == 0xb4cf && boardrev == 0x1100) {
 439 +               /* Netgear WNDR3400 */
 440 +               return ROUTER_NETGEAR_WNDR3400;
 441 +       }
 442 +
 443 +       if (boardtype == 0x042f
 444 +         && boardrev == 0x10
 445 +         && boardflags == 0
 446 +         && strev == 0x11) {
 447 +               /* Simpletech Simpleshare */
 448 +               return ROUTER_SIMPLETECH_SIMPLESHARE;
 449 +       }
 450 +
 451 +       return 0;
 452 +}
 453 +
 454 +static int parse_bcm47xx_partitions(struct mtd_info *mtd,
 455 +                                   struct mtd_partition **pparts,
 456 +                                   struct mtd_part_parser_data *data)
 457 +{
 458 +       int cfe_size;
 459 +       int dual_image_offset = 0;
 460 +       /* e.g Netgear 0x003e0000-0x003f0000 : "board_data", we exclude this
 461 +        * part from our mapping to prevent overwriting len/checksum on e.g.
 462 +        * Netgear WGR614v8/L/WW
 463 +        */
 464 +       int custom_data_size = 0;
 465 +       struct mtd_partition *bcm47xx_parts;
 466 +
 467 +       cfe_size = find_cfe_size(mtd);
 468 +       if (cfe_size < 0)
 469 +               return 0;
 470 +
 471 +       bcm47xx_parts = kzalloc(sizeof(struct mtd_partition) * 6, GFP_KERNEL);
 472 +
 473 +       bcm47xx_parts[0].name = "cfe";
 474 +       bcm47xx_parts[1].name = "linux";
 475 +       bcm47xx_parts[2].name = "rootfs";
 476 +       bcm47xx_parts[3].name = "nvram";
 477 +
 478 +       /* boot loader */
 479 +       bcm47xx_parts[0].mask_flags = MTD_WRITEABLE;
 480 +       bcm47xx_parts[0].offset = 0;
 481 +       bcm47xx_parts[0].size   = cfe_size;
 482 +
 483 +       /* nvram */
 484 +       if (cfe_size != 384 * 1024) {
 485 +
 486 +               switch (get_router()) {
 487 +               case ROUTER_NETGEAR_WGR614L:
 488 +               case ROUTER_NETGEAR_WNR834B:
 489 +               case ROUTER_NETGEAR_WNDR3300:
 490 +               case ROUTER_NETGEAR_WNR3500L:
 491 +               case ROUTER_NETGEAR_WNDR3400:
 492 +                       /* Netgear: checksum is @ 0x003AFFF8 for 4M flash or checksum
 493 +                        * is @ 0x007AFFF8 for 8M flash
 494 +                        */
 495 +                       custom_data_size = mtd->erasesize;
 496 +
 497 +                       bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
 498 +                       bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 499 +
 500 +                       /* Place CFE board_data into a partition */
 501 +                       bcm47xx_parts[4].name = "board_data";
 502 +                       bcm47xx_parts[4].offset = bcm47xx_parts[3].offset - custom_data_size;
 503 +                       bcm47xx_parts[4].size   =  custom_data_size;
 504 +                       break;
 505 +
 506 +               case ROUTER_SIMPLETECH_SIMPLESHARE:
 507 +                       /* Fixup Simpletech Simple share nvram  */
 508 +
 509 +                       pr_notice("Setting up simpletech nvram\n");
 510 +                       custom_data_size = mtd->erasesize;
 511 +
 512 +                       bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize) * 2;
 513 +                       bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 514 +
 515 +                       /* Place backup nvram into a partition */
 516 +                       bcm47xx_parts[4].name = "nvram_copy";
 517 +                       bcm47xx_parts[4].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
 518 +                       bcm47xx_parts[4].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 519 +                       break;
 520 +
 521 +               default:
 522 +                       bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
 523 +                       bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 524 +               }
 525 +
 526 +       } else {
 527 +               /* nvram (old 128kb config partition on netgear wgt634u) */
 528 +               bcm47xx_parts[3].offset = bcm47xx_parts[0].size;
 529 +               bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 530 +       }
 531 +
 532 +       /* dual image offset*/
 533 +       pr_notice("Looking for dual image\n");
 534 +       dual_image_offset = find_dual_image_off(mtd);
 535 +       /* linux (kernel and rootfs) */
 536 +       if (cfe_size != 384 * 1024) {
 537 +               if (get_router() == ROUTER_SIMPLETECH_SIMPLESHARE) {
 538 +                       bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
 539 +                       bcm47xx_parts[1].size   = bcm47xx_parts[4].offset - dual_image_offset -
 540 +                               bcm47xx_parts[1].offset - custom_data_size;
 541 +               } else {
 542 +                       bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
 543 +                       bcm47xx_parts[1].size   = bcm47xx_parts[3].offset - dual_image_offset -
 544 +                               bcm47xx_parts[1].offset - custom_data_size;
 545 +               }
 546 +       } else {
 547 +               /* do not count the elf loader, which is on one block */
 548 +               bcm47xx_parts[1].offset = bcm47xx_parts[0].size +
 549 +                       bcm47xx_parts[3].size + mtd->erasesize;
 550 +               bcm47xx_parts[1].size   = mtd->size -
 551 +                       bcm47xx_parts[0].size -
 552 +                       (2*bcm47xx_parts[3].size) -
 553 +                       mtd->erasesize - custom_data_size;
 554 +       }
 555 +
 556 +       /* find and size rootfs */
 557 +       find_root(mtd, &bcm47xx_parts[2]);
 558 +       bcm47xx_parts[2].size = mtd->size - dual_image_offset -
 559 +                               bcm47xx_parts[2].offset -
 560 +                               bcm47xx_parts[3].size - custom_data_size;
 561 +       *pparts = bcm47xx_parts;
 562 +       return bcm47xx_parts[4].name == NULL ? 4 : 5;
 563 +}
 564 +
 565 +static struct mtd_part_parser bcm47xx_parser = {
 566 +       .owner = THIS_MODULE,
 567 +       .parse_fn = parse_bcm47xx_partitions,
 568 +       .name = "bcm47xx",
 569 +};
 570 +
 571 +static int __init bcm47xx_parser_init(void)
 572 +{
 573 +       return register_mtd_parser(&bcm47xx_parser);
 574 +}
 575 +
 576 +static void __exit bcm47xx_parser_exit(void)
 577 +{
 578 +       deregister_mtd_parser(&bcm47xx_parser);
 579 +}
 580 +
 581 +module_init(bcm47xx_parser_init);
 582 +module_exit(bcm47xx_parser_exit);
 583 +
 584 +MODULE_LICENSE("GPL");
 585 +MODULE_DESCRIPTION("Parsing code for flash partitions on bcm47xx SoCs");