target/linux/brcm47xx/files-2.6.35/drivers/mtd/maps/bcm47xx-flash.c

   1 /*
   2  *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
   3  *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
   4  *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
   5  *
   6  *  original functions for finding root filesystem from Mike Baker
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  14  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  15  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  16  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  17  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  19  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  20  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  21  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  *
  24  *  You should have received a copy of the  GNU General Public License along
  25  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  26  *  675 Mass Ave, Cambridge, MA 02139, USA.
  27  *
  28  *  Copyright 2001-2003, Broadcom Corporation
  29  *  All Rights Reserved.
  30  *
  31  *  THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
  32  *  KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
  33  *  SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  34  *  FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  35  *
  36  *  Flash mapping for BCM947XX boards
  37  */
  38
  39 #include <linux/init.h>
  40 #include <linux/module.h>
  41 #include <linux/types.h>
  42 #include <linux/kernel.h>
  43 #include <linux/sched.h>
  44 #include <linux/wait.h>
  45 #include <linux/mtd/mtd.h>
  46 #include <linux/mtd/map.h>
  47 #ifdef CONFIG_MTD_PARTITIONS
  48 #include <linux/mtd/partitions.h>
  49 #endif
  50 #include <linux/crc32.h>
  51 #ifdef CONFIG_SSB
  52 #include <linux/ssb/ssb.h>
  53 #endif
  54 #include <asm/io.h>
  55
  56
  57 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  58 #define TRX_VERSION     1
  59 #define TRX_MAX_LEN     0x3A0000
  60 #define TRX_NO_HEADER   1               /* Do not write TRX header */
  61 #define TRX_GZ_FILES    0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
  62 #define TRX_MAX_OFFSET  3
  63
  64 struct trx_header {
  65         u32 magic;              /* "HDR0" */
  66         u32 len;                /* Length of file including header */
  67         u32 crc32;              /* 32-bit CRC from flag_version to end of file */
  68         u32 flag_version;       /* 0:15 flags, 16:31 version */
  69         u32 offsets[TRX_MAX_OFFSET];    /* Offsets of partitions from start of header */
  70 };
  71
  72 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
  73 #define NVRAM_SPACE 0x8000
  74 #define WINDOW_ADDR 0x1fc00000
  75 #define WINDOW_SIZE 0x400000
  76 #define BUSWIDTH 2
  77
  78 #ifdef CONFIG_SSB
  79 extern struct ssb_bus ssb_bcm47xx;
  80 #endif
  81 static struct mtd_info *bcm47xx_mtd;
  82
  83 static void bcm47xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  84 {
  85         if (len==1) {
  86                 memcpy_fromio(to, map->virt + from, len);
  87         } else {
  88                 int i;
  89                 u16 *dest = (u16 *) to;
  90                 u16 *src  = (u16 *) (map->virt + from);
  91                 for (i = 0; i < (len / 2); i++) {
  92                         dest[i] = src[i];
  93                 }
  94                 if (len & 1)
  95                         *((u8 *)dest+len-1) = src[i] & 0xff;
  96         }
  97 }
  98
  99 static struct map_info bcm47xx_map = {
 100         name: "Physically mapped flash",
 101         size: WINDOW_SIZE,
 102         bankwidth: BUSWIDTH,
 103         phys: WINDOW_ADDR,
 104 };
 105
 106 #ifdef CONFIG_MTD_PARTITIONS
 107
 108 static struct mtd_partition bcm47xx_parts[] = {
 109         { name: "cfe",  offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
 110         { name: "linux", offset: 0, size: 0, },
 111         { name: "rootfs", offset: 0, size: 0, },
 112         { name: "nvram", offset: 0, size: 0, },
 113         { name: NULL, },
 114 };
 115
 116 static int __init
 117 find_cfe_size(struct mtd_info *mtd, size_t size)
 118 {
 119         struct trx_header *trx;
 120         unsigned char buf[512];
 121         int off;
 122         size_t len;
 123         int blocksize;
 124
 125         trx = (struct trx_header *) buf;
 126
 127         blocksize = mtd->erasesize;
 128         if (blocksize < 0x10000)
 129                 blocksize = 0x10000;
 130
 131         for (off = (128*1024); off < size; off += blocksize) {
 132                 memset(buf, 0xe5, sizeof(buf));
 133
 134                 /*
 135                  * Read into buffer
 136                  */
 137                 if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
 138                     len != sizeof(buf))
 139                         continue;
 140
 141                 /* found a TRX header */
 142                 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
 143                         goto found;
 144                 }
 145         }
 146
 147         printk(KERN_NOTICE
 148                "%s: Couldn't find bootloader size\n",
 149                mtd->name);
 150         return -1;
 151
 152  found:
 153         printk(KERN_NOTICE "bootloader size: %d\n", off);
 154         return off;
 155
 156 }
 157
 158 /*
 159  * Copied from mtdblock.c
 160  *
 161  * Cache stuff...
 162  *
 163  * Since typical flash erasable sectors are much larger than what Linux's
 164  * buffer cache can handle, we must implement read-modify-write on flash
 165  * sectors for each block write requests.  To avoid over-erasing flash sectors
 166  * and to speed things up, we locally cache a whole flash sector while it is
 167  * being written to until a different sector is required.
 168  */
 169
 170 static void erase_callback(struct erase_info *done)
 171 {
 172         wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 173         wake_up(wait_q);
 174 }
 175
 176 static int erase_write (struct mtd_info *mtd, unsigned long pos,
 177                         int len, const char *buf)
 178 {
 179         struct erase_info erase;
 180         DECLARE_WAITQUEUE(wait, current);
 181         wait_queue_head_t wait_q;
 182         size_t retlen;
 183         int ret;
 184
 185         /*
 186          * First, let's erase the flash block.
 187          */
 188
 189         init_waitqueue_head(&wait_q);
 190         erase.mtd = mtd;
 191         erase.callback = erase_callback;
 192         erase.addr = pos;
 193         erase.len = len;
 194         erase.priv = (u_long)&wait_q;
 195
 196         set_current_state(TASK_INTERRUPTIBLE);
 197         add_wait_queue(&wait_q, &wait);
 198
 199         ret = mtd->erase(mtd, &erase);
 200         if (ret) {
 201                 set_current_state(TASK_RUNNING);
 202                 remove_wait_queue(&wait_q, &wait);
 203                 printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
 204                                      "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, writhe 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 __init
 226 find_dual_image_off (struct mtd_info *mtd, size_t size)
 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 < 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                                 printk("dual image TRX header found\n");
 248                                 return size/2;
 249                         } else {
 250                                 return 0;
 251                         }
 252                 }
 253         }
 254         return 0;
 255 }
 256
 257
 258 static int __init
 259 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 260 {
 261         struct trx_header trx, *trx2;
 262         unsigned char buf[512], *block;
 263         int off, blocksize;
 264         u32 i, crc = ~0;
 265         size_t len;
 266
 267         blocksize = mtd->erasesize;
 268         if (blocksize < 0x10000)
 269                 blocksize = 0x10000;
 270
 271         for (off = (128*1024); off < size; off += blocksize) {
 272                 memset(&trx, 0xe5, sizeof(trx));
 273
 274                 /*
 275                  * Read into buffer
 276                  */
 277                 if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 278                     len != sizeof(trx))
 279                         continue;
 280
 281                 /* found a TRX header */
 282                 if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 283                         part->offset = le32_to_cpu(trx.offsets[2]) ? :
 284                                 le32_to_cpu(trx.offsets[1]);
 285                         part->size = le32_to_cpu(trx.len);
 286
 287                         part->size -= part->offset;
 288                         part->offset += off;
 289
 290                         goto found;
 291                 }
 292         }
 293
 294         printk(KERN_NOTICE
 295                "%s: Couldn't find root filesystem\n",
 296                mtd->name);
 297         return -1;
 298
 299  found:
 300         if (part->size == 0)
 301                 return 0;
 302
 303         if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 304                 return 0;
 305
 306         /* Move the fs outside of the trx */
 307         part->size = 0;
 308
 309         if (trx.len != part->offset + part->size - off) {
 310                 /* Update the trx offsets and length */
 311                 trx.len = part->offset + part->size - off;
 312
 313                 /* Update the trx crc32 */
 314                 for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 315                         if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 316                                 return 0;
 317                         crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 318                 }
 319                 trx.crc32 = crc;
 320
 321                 /* read first eraseblock from the trx */
 322                 block = kmalloc(mtd->erasesize, GFP_KERNEL);
 323                 trx2 = (struct trx_header *) block;
 324                 if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 325                         printk("Error accessing the first trx eraseblock\n");
 326                         return 0;
 327                 }
 328
 329                 printk("Updating TRX offsets and length:\n");
 330                 printk("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);
 331                 printk("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);
 332
 333                 /* Write updated trx header to the flash */
 334                 memcpy(block, &trx, sizeof(trx));
 335                 if (mtd->unlock)
 336                         mtd->unlock(mtd, off, mtd->erasesize);
 337                 erase_write(mtd, off, mtd->erasesize, block);
 338                 if (mtd->sync)
 339                         mtd->sync(mtd);
 340                 kfree(block);
 341                 printk("Done\n");
 342         }
 343
 344         return part->size;
 345 }
 346
 347 struct mtd_partition * __init
 348 init_mtd_partitions(struct mtd_info *mtd, size_t size)
 349 {
 350         int cfe_size;
 351         int dual_image_offset = 0;
 352
 353         if ((cfe_size = find_cfe_size(mtd,size)) < 0)
 354                 return NULL;
 355
 356         /* boot loader */
 357         bcm47xx_parts[0].offset = 0;
 358         bcm47xx_parts[0].size   = cfe_size;
 359
 360         /* nvram */
 361         if (cfe_size != 384 * 1024) {
 362                 bcm47xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 363                 bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 364         } else {
 365                 /* nvram (old 128kb config partition on netgear wgt634u) */
 366                 bcm47xx_parts[3].offset = bcm47xx_parts[0].size;
 367                 bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 368         }
 369
 370         /* dual image offset*/
 371         printk("Looking for dual image\n");
 372         dual_image_offset=find_dual_image_off(mtd,size);
 373         /* linux (kernel and rootfs) */
 374         if (cfe_size != 384 * 1024) {
 375                 bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
 376                 bcm47xx_parts[1].size   = bcm47xx_parts[3].offset - dual_image_offset -
 377                         bcm47xx_parts[1].offset;
 378         } else {
 379                 /* do not count the elf loader, which is on one block */
 380                 bcm47xx_parts[1].offset = bcm47xx_parts[0].size +
 381                         bcm47xx_parts[3].size + mtd->erasesize;
 382                 bcm47xx_parts[1].size   = size -
 383                         bcm47xx_parts[0].size -
 384                         (2*bcm47xx_parts[3].size) -
 385                         mtd->erasesize;
 386         }
 387
 388         /* find and size rootfs */
 389         find_root(mtd,size,&bcm47xx_parts[2]);
 390         bcm47xx_parts[2].size = size - dual_image_offset - bcm47xx_parts[2].offset - bcm47xx_parts[3].size;
 391
 392         return bcm47xx_parts;
 393 }
 394 #endif
 395
 396 int __init init_bcm47xx_map(void)
 397 {
 398 #ifdef CONFIG_SSB
 399         struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
 400 #endif
 401         size_t size;
 402         int ret = 0;
 403 #ifdef CONFIG_MTD_PARTITIONS
 404         struct mtd_partition *parts;
 405         int i;
 406 #endif
 407
 408 #ifdef CONFIG_SSB
 409         u32 window = mcore->flash_window;
 410         u32 window_size = mcore->flash_window_size;
 411
 412         printk("flash init: 0x%08x 0x%08x\n", window, window_size);
 413         bcm47xx_map.phys = window;
 414         bcm47xx_map.size = window_size;
 415         bcm47xx_map.bankwidth = mcore->flash_buswidth;
 416         bcm47xx_map.virt = ioremap_nocache(window, window_size);
 417 #else
 418         printk("flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
 419         bcm47xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
 420 #endif
 421
 422         if (!bcm47xx_map.virt) {
 423                 printk("Failed to ioremap\n");
 424                 return -EIO;
 425         }
 426
 427         simple_map_init(&bcm47xx_map);
 428
 429         if (!(bcm47xx_mtd = do_map_probe("cfi_probe", &bcm47xx_map))) {
 430                 printk("Failed to do_map_probe\n");
 431                 iounmap((void *)bcm47xx_map.virt);
 432                 return -ENXIO;
 433         }
 434
 435         /* override copy_from routine */
 436         bcm47xx_map.copy_from = bcm47xx_map_copy_from;
 437
 438         bcm47xx_mtd->owner = THIS_MODULE;
 439
 440         size = bcm47xx_mtd->size;
 441
 442         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
 443
 444 #ifdef CONFIG_MTD_PARTITIONS
 445         parts = init_mtd_partitions(bcm47xx_mtd, size);
 446         for (i = 0; parts[i].name; i++);
 447         ret = add_mtd_partitions(bcm47xx_mtd, parts, i);
 448         if (ret) {
 449                 printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 450                 goto fail;
 451         }
 452 #endif
 453         return 0;
 454
 455  fail:
 456         if (bcm47xx_mtd)
 457                 map_destroy(bcm47xx_mtd);
 458         if (bcm47xx_map.virt)
 459                 iounmap((void *)bcm47xx_map.virt);
 460         bcm47xx_map.virt = 0;
 461         return ret;
 462 }
 463
 464 void __exit cleanup_bcm47xx_map(void)
 465 {
 466 #ifdef CONFIG_MTD_PARTITIONS
 467         del_mtd_partitions(bcm47xx_mtd);
 468 #endif
 469         map_destroy(bcm47xx_mtd);
 470         iounmap((void *)bcm47xx_map.virt);
 471 }
 472
 473 module_init(init_bcm47xx_map);
 474 module_exit(cleanup_bcm47xx_map);