target/linux/brcm47xx/patches-3.0/0017-mtd-bcm47xx-add-bcm47xx-part-parser.patch

   1 From 1934b89b42976a083c2ad8d8fdc526ab5b05c5e4 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 17/26] 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 |  536 +++++++++++++++++++++++++++++++++++++++++++++
  12  3 files changed, 544 insertions(+), 0 deletions(-)
  13  create mode 100644 drivers/mtd/bcm47xxpart.c
  14
  15 --- a/drivers/mtd/Kconfig
  16 +++ b/drivers/mtd/Kconfig
  17 @@ -173,6 +173,13 @@ 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 +1,536 @@
  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 +
 130 +static struct mtd_partition bcm47xx_parts[] = {
 131 +       { name: "cfe",  offset:0, size:0, mask_flags:MTD_WRITEABLE, },
 132 +       { name: "linux", offset:0, size:0, },
 133 +       { name: "rootfs", offset:0, size:0, },
 134 +       { name: "nvram", offset:0, size:0, },
 135 +       { name: NULL, }, /* Used to create custom partitons with the function get_router() */
 136 +       { name: NULL, },
 137 +};
 138 +
 139 +static int
 140 +find_cfe_size(struct mtd_info *mtd)
 141 +{
 142 +       struct trx_header *trx;
 143 +       unsigned char buf[512];
 144 +       int off;
 145 +       size_t len;
 146 +       int blocksize;
 147 +
 148 +       trx = (struct trx_header *) buf;
 149 +
 150 +       blocksize = mtd->erasesize;
 151 +       if (blocksize < 0x10000)
 152 +               blocksize = 0x10000;
 153 +
 154 +       for (off = (128*1024); off < mtd->size; off += blocksize) {
 155 +               memset(buf, 0xe5, sizeof(buf));
 156 +
 157 +               /*
 158 +                * Read into buffer
 159 +                */
 160 +               if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
 161 +                   len != sizeof(buf))
 162 +                       continue;
 163 +
 164 +               if (le32_to_cpu(trx->magic) == EDIMAX_PS_HEADER_MAGIC) {
 165 +                       if (mtd->read(mtd, off + EDIMAX_PS_HEADER_LEN,
 166 +                           sizeof(buf), &len, buf) || len != sizeof(buf)) {
 167 +                               continue;
 168 +                       } else {
 169 +                               pr_notice("Found edimax header\n");
 170 +                       }
 171 +               }
 172 +
 173 +               /* found a TRX header */
 174 +               if (le32_to_cpu(trx->magic) == TRX_MAGIC)
 175 +                       goto found;
 176 +       }
 177 +
 178 +       pr_notice("%s: Couldn't find bootloader size\n", mtd->name);
 179 +       return -1;
 180 +
 181 + found:
 182 +       pr_notice("bootloader size: %d\n", off);
 183 +       return off;
 184 +
 185 +}
 186 +
 187 +/*
 188 + * Copied from mtdblock.c
 189 + *
 190 + * Cache stuff...
 191 + *
 192 + * Since typical flash erasable sectors are much larger than what Linux's
 193 + * buffer cache can handle, we must implement read-modify-write on flash
 194 + * sectors for each block write requests.  To avoid over-erasing flash sectors
 195 + * and to speed things up, we locally cache a whole flash sector while it is
 196 + * being written to until a different sector is required.
 197 + */
 198 +
 199 +static void erase_callback(struct erase_info *done)
 200 +{
 201 +       wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 202 +       wake_up(wait_q);
 203 +}
 204 +
 205 +static int erase_write(struct mtd_info *mtd, unsigned long pos,
 206 +                       int len, const char *buf)
 207 +{
 208 +       struct erase_info erase;
 209 +       DECLARE_WAITQUEUE(wait, current);
 210 +       wait_queue_head_t wait_q;
 211 +       size_t retlen;
 212 +       int ret;
 213 +
 214 +       /*
 215 +        * First, let's erase the flash block.
 216 +        */
 217 +
 218 +       init_waitqueue_head(&wait_q);
 219 +       erase.mtd = mtd;
 220 +       erase.callback = erase_callback;
 221 +       erase.addr = pos;
 222 +       erase.len = len;
 223 +       erase.priv = (u_long)&wait_q;
 224 +
 225 +       set_current_state(TASK_INTERRUPTIBLE);
 226 +       add_wait_queue(&wait_q, &wait);
 227 +
 228 +       ret = mtd->erase(mtd, &erase);
 229 +       if (ret) {
 230 +               set_current_state(TASK_RUNNING);
 231 +               remove_wait_queue(&wait_q, &wait);
 232 +               pr_warn("erase of region [0x%lx, 0x%x] on \"%s\" failed\n",
 233 +                       pos, len, mtd->name);
 234 +               return ret;
 235 +       }
 236 +
 237 +       schedule();  /* Wait for erase to finish. */
 238 +       remove_wait_queue(&wait_q, &wait);
 239 +
 240 +       /*
 241 +        * Next, write data to flash.
 242 +        */
 243 +
 244 +       ret = mtd->write(mtd, pos, len, &retlen, buf);
 245 +       if (ret)
 246 +               return ret;
 247 +       if (retlen != len)
 248 +               return -EIO;
 249 +       return 0;
 250 +}
 251 +
 252 +
 253 +static int
 254 +find_dual_image_off(struct mtd_info *mtd)
 255 +{
 256 +       struct trx_header trx;
 257 +       int off, blocksize;
 258 +       size_t len;
 259 +
 260 +       blocksize = mtd->erasesize;
 261 +       if (blocksize < 0x10000)
 262 +               blocksize = 0x10000;
 263 +
 264 +       for (off = (128*1024); off < mtd->size; off += blocksize) {
 265 +               memset(&trx, 0xe5, sizeof(trx));
 266 +               /*
 267 +               * Read into buffer
 268 +               */
 269 +               if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 270 +                   len != sizeof(trx))
 271 +                       continue;
 272 +               /* found last TRX header */
 273 +               if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 274 +                       if (le32_to_cpu(trx.flag_version >> 16) == 2) {
 275 +                               pr_notice("dual image TRX header found\n");
 276 +                               return mtd->size / 2;
 277 +                       } else {
 278 +                               return 0;
 279 +                       }
 280 +               }
 281 +       }
 282 +       return 0;
 283 +}
 284 +
 285 +
 286 +static int
 287 +find_root(struct mtd_info *mtd, struct mtd_partition *part)
 288 +{
 289 +       struct trx_header trx, *trx2;
 290 +       unsigned char buf[512], *block;
 291 +       int off, blocksize, trxoff = 0;
 292 +       u32 i, crc = ~0;
 293 +       size_t len;
 294 +       bool edimax = false;
 295 +
 296 +       blocksize = mtd->erasesize;
 297 +       if (blocksize < 0x10000)
 298 +               blocksize = 0x10000;
 299 +
 300 +       for (off = (128*1024); off < mtd->size; off += blocksize) {
 301 +               memset(&trx, 0xe5, sizeof(trx));
 302 +
 303 +               /*
 304 +                * Read into buffer
 305 +                */
 306 +               if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 307 +                   len != sizeof(trx))
 308 +                       continue;
 309 +
 310 +               /* found an edimax header */
 311 +               if (le32_to_cpu(trx.magic) == EDIMAX_PS_HEADER_MAGIC) {
 312 +                       /* read the correct trx header */
 313 +                       if (mtd->read(mtd, off + EDIMAX_PS_HEADER_LEN,
 314 +                           sizeof(trx), &len, (char *) &trx) ||
 315 +                           len != sizeof(trx)) {
 316 +                               continue;
 317 +                       } else {
 318 +                               pr_notice("Found an edimax ps header\n");
 319 +                               edimax = true;
 320 +                       }
 321 +               }
 322 +
 323 +               /* found a TRX header */
 324 +               if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 325 +                       part->offset = le32_to_cpu(trx.offsets[2]) ? :
 326 +                               le32_to_cpu(trx.offsets[1]);
 327 +                       part->size = le32_to_cpu(trx.len);
 328 +
 329 +                       part->size -= part->offset;
 330 +                       part->offset += off;
 331 +                       if (edimax) {
 332 +                               off += EDIMAX_PS_HEADER_LEN;
 333 +                               trxoff = EDIMAX_PS_HEADER_LEN;
 334 +                       }
 335 +
 336 +                       goto found;
 337 +               }
 338 +       }
 339 +
 340 +       pr_warn("%s: Couldn't find root filesystem\n",
 341 +              mtd->name);
 342 +       return -1;
 343 +
 344 + found:
 345 +       pr_notice("TRX offset : %x\n", trxoff);
 346 +       if (part->size == 0)
 347 +               return 0;
 348 +
 349 +       if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 350 +               return 0;
 351 +
 352 +       /* Move the fs outside of the trx */
 353 +       part->size = 0;
 354 +
 355 +       if (trx.len != part->offset + part->size - off) {
 356 +               /* Update the trx offsets and length */
 357 +               trx.len = part->offset + part->size - off;
 358 +
 359 +               /* Update the trx crc32 */
 360 +               for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 361 +                       if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 362 +                               return 0;
 363 +                       crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 364 +               }
 365 +               trx.crc32 = crc;
 366 +
 367 +               /* read first eraseblock from the trx */
 368 +               block = kmalloc(mtd->erasesize, GFP_KERNEL);
 369 +               trx2 = (struct trx_header *) block;
 370 +               if (mtd->read(mtd, off - trxoff, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 371 +                       pr_err("Error accessing the first trx eraseblock\n");
 372 +                       return 0;
 373 +               }
 374 +
 375 +               pr_notice("Updating TRX offsets and length:\n");
 376 +               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);
 377 +               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);
 378 +
 379 +               /* Write updated trx header to the flash */
 380 +               memcpy(block + trxoff, &trx, sizeof(trx));
 381 +               if (mtd->unlock)
 382 +                       mtd->unlock(mtd, off - trxoff, mtd->erasesize);
 383 +               erase_write(mtd, off - trxoff, mtd->erasesize, block);
 384 +               if (mtd->sync)
 385 +                       mtd->sync(mtd);
 386 +               kfree(block);
 387 +               pr_notice("Done\n");
 388 +       }
 389 +
 390 +       return part->size;
 391 +}
 392 +
 393 +static int get_router(void)
 394 +{
 395 +       char buf[20];
 396 +       u32 boardnum = 0;
 397 +       u16 boardtype = 0;
 398 +       u16 boardrev = 0;
 399 +       u32 boardflags = 0;
 400 +       u16 sdram_init = 0;
 401 +       u16 cardbus = 0;
 402 +       u16 strev = 0;
 403 +
 404 +       if (nvram_getenv("boardnum", buf, sizeof(buf)) >= 0)
 405 +               boardnum = simple_strtoul(buf, NULL, 0);
 406 +       if (nvram_getenv("boardtype", buf, sizeof(buf)) >= 0)
 407 +               boardtype = simple_strtoul(buf, NULL, 0);
 408 +       if (nvram_getenv("boardrev", buf, sizeof(buf)) >= 0)
 409 +               boardrev = simple_strtoul(buf, NULL, 0);
 410 +       if (nvram_getenv("boardflags", buf, sizeof(buf)) >= 0)
 411 +               boardflags = simple_strtoul(buf, NULL, 0);
 412 +       if (nvram_getenv("sdram_init", buf, sizeof(buf)) >= 0)
 413 +               sdram_init = simple_strtoul(buf, NULL, 0);
 414 +       if (nvram_getenv("cardbus", buf, sizeof(buf)) >= 0)
 415 +               cardbus = simple_strtoul(buf, NULL, 0);
 416 +       if (nvram_getenv("st_rev", buf, sizeof(buf)) >= 0)
 417 +               strev = simple_strtoul(buf, NULL, 0);
 418 +
 419 +       if ((boardnum == 8 || boardnum == 01)
 420 +         && boardtype == 0x0472 && cardbus == 1) {
 421 +               /* Netgear WNR834B, Netgear WNR834Bv2 */
 422 +               return ROUTER_NETGEAR_WNR834B;
 423 +       }
 424 +
 425 +       if (boardnum == 01 && boardtype == 0x0472 && boardrev == 0x23) {
 426 +               /* Netgear WNDR-3300 */
 427 +               return ROUTER_NETGEAR_WNDR3300;
 428 +       }
 429 +
 430 +       if ((boardnum == 83258 || boardnum == 01)
 431 +         && boardtype == 0x048e
 432 +         && (boardrev == 0x11 || boardrev == 0x10)
 433 +         && boardflags == 0x750
 434 +         && sdram_init == 0x000A) {
 435 +               /* Netgear WGR614v8/L/WW 16MB ram, cfe v1.3 or v1.5 */
 436 +               return ROUTER_NETGEAR_WGR614L;
 437 +       }
 438 +
 439 +       if ((boardnum == 1 || boardnum == 3500)
 440 +         && boardtype == 0x04CF
 441 +         && (boardrev == 0x1213 || boardrev == 02)) {
 442 +               /* Netgear WNR3500v2/U/L */
 443 +               return ROUTER_NETGEAR_WNR3500L;
 444 +       }
 445 +
 446 +       if (boardtype == 0x042f
 447 +         && boardrev == 0x10
 448 +         && boardflags == 0
 449 +         && strev == 0x11) {
 450 +               /* Simpletech Simpleshare */
 451 +               return ROUTER_SIMPLETECH_SIMPLESHARE;
 452 +       }
 453 +
 454 +       return 0;
 455 +}
 456 +
 457 +static int parse_bcm47xx_partitions(struct mtd_info *mtd,
 458 +                                   struct mtd_partition **pparts,
 459 +//                                 struct mtd_part_parser_data *data)
 460 +                                   unsigned long data)
 461 +{
 462 +       int cfe_size;
 463 +       int dual_image_offset = 0;
 464 +       /* e.g Netgear 0x003e0000-0x003f0000 : "board_data", we exclude this
 465 +        * part from our mapping to prevent overwriting len/checksum on e.g.
 466 +        * Netgear WGR614v8/L/WW
 467 +        */
 468 +       int custom_data_size = 0;
 469 +
 470 +       cfe_size = find_cfe_size(mtd);
 471 +       if (cfe_size < 0)
 472 +               return 0;
 473 +
 474 +       /* boot loader */
 475 +       bcm47xx_parts[0].offset = 0;
 476 +       bcm47xx_parts[0].size   = cfe_size;
 477 +
 478 +       /* nvram */
 479 +       if (cfe_size != 384 * 1024) {
 480 +
 481 +               switch (get_router()) {
 482 +               case ROUTER_NETGEAR_WGR614L:
 483 +               case ROUTER_NETGEAR_WNR834B:
 484 +               case ROUTER_NETGEAR_WNDR3300:
 485 +               case ROUTER_NETGEAR_WNR3500L:
 486 +                       /* Netgear: checksum is @ 0x003AFFF8 for 4M flash or checksum
 487 +                        * is @ 0x007AFFF8 for 8M flash
 488 +                        */
 489 +                       custom_data_size = mtd->erasesize;
 490 +
 491 +                       bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
 492 +                       bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 493 +
 494 +                       /* Place CFE board_data into a partition */
 495 +                       bcm47xx_parts[4].name = "board_data";
 496 +                       bcm47xx_parts[4].offset = bcm47xx_parts[3].offset - custom_data_size;
 497 +                       bcm47xx_parts[4].size   =  custom_data_size;
 498 +                       break;
 499 +
 500 +               case ROUTER_SIMPLETECH_SIMPLESHARE:
 501 +                       /* Fixup Simpletech Simple share nvram  */
 502 +
 503 +                       pr_notice("Setting up simpletech nvram\n");
 504 +                       custom_data_size = mtd->erasesize;
 505 +
 506 +                       bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize) * 2;
 507 +                       bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 508 +
 509 +                       /* Place backup nvram into a partition */
 510 +                       bcm47xx_parts[4].name = "nvram_copy";
 511 +                       bcm47xx_parts[4].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
 512 +                       bcm47xx_parts[4].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 513 +                       break;
 514 +
 515 +               default:
 516 +                       bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
 517 +                       bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 518 +               }
 519 +
 520 +       } else {
 521 +               /* nvram (old 128kb config partition on netgear wgt634u) */
 522 +               bcm47xx_parts[3].offset = bcm47xx_parts[0].size;
 523 +               bcm47xx_parts[3].size   = roundup(NVRAM_SPACE, mtd->erasesize);
 524 +       }
 525 +
 526 +       /* dual image offset*/
 527 +       pr_notice("Looking for dual image\n");
 528 +       dual_image_offset = find_dual_image_off(mtd);
 529 +       /* linux (kernel and rootfs) */
 530 +       if (cfe_size != 384 * 1024) {
 531 +               if (get_router() == ROUTER_SIMPLETECH_SIMPLESHARE) {
 532 +                       bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
 533 +                       bcm47xx_parts[1].size   = bcm47xx_parts[4].offset - dual_image_offset -
 534 +                               bcm47xx_parts[1].offset - custom_data_size;
 535 +               } else {
 536 +                       bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
 537 +                       bcm47xx_parts[1].size   = bcm47xx_parts[3].offset - dual_image_offset -
 538 +                               bcm47xx_parts[1].offset - custom_data_size;
 539 +               }
 540 +       } else {
 541 +               /* do not count the elf loader, which is on one block */
 542 +               bcm47xx_parts[1].offset = bcm47xx_parts[0].size +
 543 +                       bcm47xx_parts[3].size + mtd->erasesize;
 544 +               bcm47xx_parts[1].size   = mtd->size -
 545 +                       bcm47xx_parts[0].size -
 546 +                       (2*bcm47xx_parts[3].size) -
 547 +                       mtd->erasesize - custom_data_size;
 548 +       }
 549 +
 550 +       /* find and size rootfs */
 551 +       find_root(mtd, &bcm47xx_parts[2]);
 552 +       bcm47xx_parts[2].size = mtd->size - dual_image_offset -
 553 +                               bcm47xx_parts[2].offset -
 554 +                               bcm47xx_parts[3].size - custom_data_size;
 555 +       *pparts = bcm47xx_parts;
 556 +       return bcm47xx_parts[4].name == NULL ? 4 : 5;
 557 +}
 558 +
 559 +static struct mtd_part_parser bcm47xx_parser = {
 560 +       .owner = THIS_MODULE,
 561 +       .parse_fn = parse_bcm47xx_partitions,
 562 +       .name = "bcm47xx",
 563 +};
 564 +
 565 +static int __init bcm47xx_parser_init(void)
 566 +{
 567 +       return register_mtd_parser(&bcm47xx_parser);
 568 +}
 569 +
 570 +static void __exit bcm47xx_parser_exit(void)
 571 +{
 572 +       deregister_mtd_parser(&bcm47xx_parser);
 573 +}
 574 +
 575 +module_init(bcm47xx_parser_init);
 576 +module_exit(bcm47xx_parser_exit);
 577 +
 578 +MODULE_LICENSE("GPL");
 579 +MODULE_DESCRIPTION("Parsing code for flash partitions on bcm47xx SoCs");