target/linux/brcm47xx-2.6/files/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/wait.h>
  44 #include <linux/mtd/mtd.h>
  45 #include <linux/mtd/map.h>
  46 #ifdef CONFIG_MTD_PARTITIONS
  47 #include <linux/mtd/partitions.h>
  48 #endif
  49 #include <linux/squashfs_fs.h>
  50 #include <linux/jffs2.h>
  51 #include <linux/crc32.h>
  52 #ifdef CONFIG_SSB
  53 #include <linux/ssb/ssb.h>
  54 #endif
  55 #include <asm/io.h>
  56
  57
  58 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  59 #define TRX_VERSION     1
  60 #define TRX_MAX_LEN     0x3A0000
  61 #define TRX_NO_HEADER   1               /* Do not write TRX header */
  62 #define TRX_GZ_FILES    0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
  63 #define TRX_MAX_OFFSET  3
  64
  65 struct trx_header {
  66         u32 magic;              /* "HDR0" */
  67         u32 len;                /* Length of file including header */
  68         u32 crc32;              /* 32-bit CRC from flag_version to end of file */
  69         u32 flag_version;       /* 0:15 flags, 16:31 version */
  70         u32 offsets[TRX_MAX_OFFSET];    /* Offsets of partitions from start of header */
  71 };
  72
  73 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
  74 #define NVRAM_SPACE 0x8000
  75 #define WINDOW_ADDR 0x1fc00000
  76 #define WINDOW_SIZE 0x400000
  77 #define BUSWIDTH 2
  78
  79 #ifdef CONFIG_SSB
  80 extern struct ssb_bus ssb;
  81 #endif
  82 static struct mtd_info *bcm947xx_mtd;
  83
  84 static struct map_info bcm947xx_map = {
  85         name: "Physically mapped flash",
  86         size: WINDOW_SIZE,
  87         bankwidth: BUSWIDTH,
  88         phys: WINDOW_ADDR,
  89 };
  90
  91 #ifdef CONFIG_MTD_PARTITIONS
  92
  93 static struct mtd_partition bcm947xx_parts[] = {
  94         { name: "cfe",  offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
  95         { name: "linux", offset: 0, size: 0, },
  96         { name: "rootfs", offset: 0, size: 0, },
  97         { name: "nvram", offset: 0, size: 0, },
  98         { name: "rootfs_data", offset: 0, size: 0, },
  99         { name: NULL, },
 100 };
 101
 102 static int __init
 103 find_cfe_size(struct mtd_info *mtd, size_t size)
 104 {
 105         struct trx_header *trx;
 106         unsigned char buf[512];
 107         int off;
 108         size_t len;
 109         int blocksize;
 110
 111         trx = (struct trx_header *) buf;
 112
 113         blocksize = mtd->erasesize;
 114         if (blocksize < 0x10000)
 115                 blocksize = 0x10000;
 116
 117         for (off = (128*1024); off < size; off += blocksize) {
 118                 memset(buf, 0xe5, sizeof(buf));
 119
 120                 /*
 121                  * Read into buffer
 122                  */
 123                 if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
 124                     len != sizeof(buf))
 125                         continue;
 126
 127                 /* found a TRX header */
 128                 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
 129                         goto found;
 130                 }
 131         }
 132
 133         printk(KERN_NOTICE
 134                "%s: Couldn't find bootloader size\n",
 135                mtd->name);
 136         return -1;
 137
 138  found:
 139         printk(KERN_NOTICE "bootloader size: %d\n", off);
 140         return off;
 141
 142 }
 143
 144 /*
 145  * Copied from mtdblock.c
 146  *
 147  * Cache stuff...
 148  *
 149  * Since typical flash erasable sectors are much larger than what Linux's
 150  * buffer cache can handle, we must implement read-modify-write on flash
 151  * sectors for each block write requests.  To avoid over-erasing flash sectors
 152  * and to speed things up, we locally cache a whole flash sector while it is
 153  * being written to until a different sector is required.
 154  */
 155
 156 static void erase_callback(struct erase_info *done)
 157 {
 158         wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 159         wake_up(wait_q);
 160 }
 161
 162 static int erase_write (struct mtd_info *mtd, unsigned long pos,
 163                         int len, const char *buf)
 164 {
 165         struct erase_info erase;
 166         DECLARE_WAITQUEUE(wait, current);
 167         wait_queue_head_t wait_q;
 168         size_t retlen;
 169         int ret;
 170
 171         /*
 172          * First, let's erase the flash block.
 173          */
 174
 175         init_waitqueue_head(&wait_q);
 176         erase.mtd = mtd;
 177         erase.callback = erase_callback;
 178         erase.addr = pos;
 179         erase.len = len;
 180         erase.priv = (u_long)&wait_q;
 181
 182         set_current_state(TASK_INTERRUPTIBLE);
 183         add_wait_queue(&wait_q, &wait);
 184
 185         ret = mtd->erase(mtd, &erase);
 186         if (ret) {
 187                 set_current_state(TASK_RUNNING);
 188                 remove_wait_queue(&wait_q, &wait);
 189                 printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
 190                                      "on \"%s\" failed\n",
 191                         pos, len, mtd->name);
 192                 return ret;
 193         }
 194
 195         schedule();  /* Wait for erase to finish. */
 196         remove_wait_queue(&wait_q, &wait);
 197
 198         /*
 199          * Next, writhe data to flash.
 200          */
 201
 202         ret = mtd->write (mtd, pos, len, &retlen, buf);
 203         if (ret)
 204                 return ret;
 205         if (retlen != len)
 206                 return -EIO;
 207         return 0;
 208 }
 209
 210
 211
 212
 213 static int __init
 214 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 215 {
 216         struct trx_header trx, *trx2;
 217         unsigned char buf[512], *block;
 218         int off, blocksize;
 219         u32 i, crc = ~0;
 220         size_t len;
 221         struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 222
 223         blocksize = mtd->erasesize;
 224         if (blocksize < 0x10000)
 225                 blocksize = 0x10000;
 226
 227         for (off = (128*1024); off < size; off += blocksize) {
 228                 memset(&trx, 0xe5, sizeof(trx));
 229
 230                 /*
 231                  * Read into buffer
 232                  */
 233                 if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 234                     len != sizeof(trx))
 235                         continue;
 236
 237                 /* found a TRX header */
 238                 if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 239                         part->offset = le32_to_cpu(trx.offsets[2]) ? :
 240                                 le32_to_cpu(trx.offsets[1]);
 241                         part->size = le32_to_cpu(trx.len);
 242
 243                         part->size -= part->offset;
 244                         part->offset += off;
 245
 246                         goto found;
 247                 }
 248         }
 249
 250         printk(KERN_NOTICE
 251                "%s: Couldn't find root filesystem\n",
 252                mtd->name);
 253         return -1;
 254
 255  found:
 256         if (part->size == 0)
 257                 return 0;
 258
 259         if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 260                 return 0;
 261
 262         if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
 263                 printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", mtd->name, (u32) sb->bytes_used);
 264
 265                 /* Update the squashfs partition size based on the superblock info */
 266                 part->size = sb->bytes_used;
 267                 len = part->offset + part->size;
 268                 len +=  (mtd->erasesize - 1);
 269                 len &= ~(mtd->erasesize - 1);
 270                 part->size = len - part->offset;
 271         } else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) {
 272                 printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name);
 273
 274                 /* Move the squashfs outside of the trx */
 275                 part->size = 0;
 276         } else {
 277                 printk(KERN_INFO "%s: Filesystem type: unknown\n", mtd->name);
 278                 return 0;
 279         }
 280
 281         if (trx.len != part->offset + part->size - off) {
 282                 /* Update the trx offsets and length */
 283                 trx.len = part->offset + part->size - off;
 284
 285                 /* Update the trx crc32 */
 286                 for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 287                         if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 288                                 return 0;
 289                         crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 290                 }
 291                 trx.crc32 = crc;
 292
 293                 /* read first eraseblock from the trx */
 294                 block = kmalloc(mtd->erasesize, GFP_KERNEL);
 295                 trx2 = (struct trx_header *) block;
 296                 if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 297                         printk("Error accessing the first trx eraseblock\n");
 298                         return 0;
 299                 }
 300
 301                 printk("Updating TRX offsets and length:\n");
 302                 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);
 303                 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);
 304
 305                 /* Write updated trx header to the flash */
 306                 memcpy(block, &trx, sizeof(trx));
 307                 if (mtd->unlock)
 308                         mtd->unlock(mtd, off, mtd->erasesize);
 309                 erase_write(mtd, off, mtd->erasesize, block);
 310                 if (mtd->sync)
 311                         mtd->sync(mtd);
 312                 kfree(block);
 313                 printk("Done\n");
 314         }
 315
 316         return part->size;
 317 }
 318
 319 struct mtd_partition * __init
 320 init_mtd_partitions(struct mtd_info *mtd, size_t size)
 321 {
 322         int cfe_size;
 323
 324         if ((cfe_size = find_cfe_size(mtd,size)) < 0)
 325                 return NULL;
 326
 327         /* boot loader */
 328         bcm947xx_parts[0].offset = 0;
 329         bcm947xx_parts[0].size   = cfe_size;
 330
 331         /* nvram */
 332         if (cfe_size != 384 * 1024) {
 333                 bcm947xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 334                 bcm947xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 335         } else {
 336                 /* nvram (old 128kb config partition on netgear wgt634u) */
 337                 bcm947xx_parts[3].offset = bcm947xx_parts[0].size;
 338                 bcm947xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 339         }
 340
 341         /* linux (kernel and rootfs) */
 342         if (cfe_size != 384 * 1024) {
 343                 bcm947xx_parts[1].offset = bcm947xx_parts[0].size;
 344                 bcm947xx_parts[1].size   = bcm947xx_parts[3].offset -
 345                         bcm947xx_parts[1].offset;
 346         } else {
 347                 /* do not count the elf loader, which is on one block */
 348                 bcm947xx_parts[1].offset = bcm947xx_parts[0].size +
 349                         bcm947xx_parts[3].size + mtd->erasesize;
 350                 bcm947xx_parts[1].size   = size -
 351                         bcm947xx_parts[0].size -
 352                         (2*bcm947xx_parts[3].size) -
 353                         mtd->erasesize;
 354         }
 355
 356         /* find and size rootfs */
 357         if (find_root(mtd,size,&bcm947xx_parts[2])==0) {
 358                 /* entirely jffs2 */
 359                 bcm947xx_parts[4].name = NULL;
 360                 bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset -
 361                                 bcm947xx_parts[3].size;
 362         } else {
 363                 /* legacy setup */
 364                 /* calculate leftover flash, and assign it to the jffs2 partition */
 365                 if (cfe_size != 384 * 1024) {
 366                         bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
 367                                 bcm947xx_parts[2].size;
 368                         if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
 369                                 bcm947xx_parts[4].offset += mtd->erasesize -
 370                                         (bcm947xx_parts[4].offset % mtd->erasesize);
 371                         }
 372                         bcm947xx_parts[4].size = bcm947xx_parts[3].offset -
 373                                 bcm947xx_parts[4].offset;
 374                 } else {
 375                         bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
 376                                 bcm947xx_parts[2].size;
 377                         if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
 378                                 bcm947xx_parts[4].offset += mtd->erasesize -
 379                                         (bcm947xx_parts[4].offset % mtd->erasesize);
 380                         }
 381                         bcm947xx_parts[4].size = size - bcm947xx_parts[3].size -
 382                                 bcm947xx_parts[4].offset;
 383                 }
 384         }
 385
 386         return bcm947xx_parts;
 387 }
 388 #endif
 389
 390 int __init init_bcm947xx_map(void)
 391 {
 392 #ifdef CONFIG_SSB
 393         struct ssb_mipscore *mcore = &ssb.mipscore;
 394 #endif
 395         size_t size;
 396         int ret = 0;
 397 #ifdef CONFIG_MTD_PARTITIONS
 398         struct mtd_partition *parts;
 399         int i;
 400 #endif
 401
 402 #ifdef CONFIG_SSB
 403         u32 window = mcore->flash_window;
 404         u32 window_size = mcore->flash_window_size;
 405
 406         printk("flash init: 0x%08x 0x%08x\n", window, window_size);
 407         bcm947xx_map.phys = window;
 408         bcm947xx_map.size = window_size;
 409         bcm947xx_map.virt = ioremap_nocache(window, window_size);
 410 #else
 411         printk("flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
 412         bcm947xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
 413 #endif
 414
 415         if (!bcm947xx_map.virt) {
 416                 printk("Failed to ioremap\n");
 417                 return -EIO;
 418         }
 419         simple_map_init(&bcm947xx_map);
 420
 421         if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
 422                 printk("Failed to do_map_probe\n");
 423                 iounmap((void *)bcm947xx_map.virt);
 424                 return -ENXIO;
 425         }
 426
 427         bcm947xx_mtd->owner = THIS_MODULE;
 428
 429         size = bcm947xx_mtd->size;
 430
 431         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
 432
 433 #ifdef CONFIG_MTD_PARTITIONS
 434         parts = init_mtd_partitions(bcm947xx_mtd, size);
 435         for (i = 0; parts[i].name; i++);
 436         ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
 437         if (ret) {
 438                 printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 439                 goto fail;
 440         }
 441 #endif
 442         return 0;
 443
 444  fail:
 445         if (bcm947xx_mtd)
 446                 map_destroy(bcm947xx_mtd);
 447         if (bcm947xx_map.virt)
 448                 iounmap((void *)bcm947xx_map.virt);
 449         bcm947xx_map.virt = 0;
 450         return ret;
 451 }
 452
 453 void __exit cleanup_bcm947xx_map(void)
 454 {
 455 #ifdef CONFIG_MTD_PARTITIONS
 456         del_mtd_partitions(bcm947xx_mtd);
 457 #endif
 458         map_destroy(bcm947xx_mtd);
 459         iounmap((void *)bcm947xx_map.virt);
 460 }
 461
 462 module_init(init_bcm947xx_map);
 463 module_exit(cleanup_bcm947xx_map);