target/linux/brcm63xx-2.6/files/drivers/mtd/maps/bcm963xx-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 BCM963XX 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 #include <asm/io.h>
  53
  54 #include <asm/mach-bcm963xx/bootloaders.h>
  55
  56 extern int boot_loader_type;
  57 extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts, unsigned long fis_origin);
  58 static struct mtd_partition *parsed_parts;
  59
  60
  61 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  62 #define TRX_VERSION     1
  63 #define TRX_MAX_LEN     0x3A0000
  64 #define TRX_NO_HEADER   1               /* Do not write TRX header */
  65 #define TRX_GZ_FILES    0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
  66 #define TRX_MAX_OFFSET  3
  67
  68 struct trx_header {
  69         u32 magic;              /* "HDR0" */
  70         u32 len;                /* Length of file including header */
  71         u32 crc32;              /* 32-bit CRC from flag_version to end of file */
  72         u32 flag_version;       /* 0:15 flags, 16:31 version */
  73         u32 offsets[TRX_MAX_OFFSET];    /* Offsets of partitions from start of header */
  74 };
  75
  76 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
  77 #define NVRAM_SPACE 0x8000
  78 #define WINDOW_ADDR 0x1FC00000
  79 #define WINDOW_SIZE 0x400000
  80 #define BUSWIDTH 2
  81
  82 #define EXTENDED_SIZE 0xBFC00000       /* Extended flash address */
  83
  84 static struct mtd_info *bcm963xx_mtd;
  85
  86 static struct map_info bcm963xx_map = {
  87         .name           = "Physically mapped flash",
  88         .size           = WINDOW_SIZE,
  89         .bankwidth      = BUSWIDTH,
  90         .phys           = WINDOW_ADDR,
  91 };
  92
  93 #ifdef CONFIG_MTD_PARTITIONS
  94
  95 static struct mtd_partition bcm963xx_parts[] = {
  96         { name: "cfe",  offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
  97         { name: "linux", offset: 0, size: 0, },
  98         { name: "rootfs", offset: 0, size: 0, },
  99         { name: "nvram", offset: 0, size: 0, },
 100         { name: "OpenWrt", offset: 0, size: 0, },
 101         { name: NULL, },
 102 };
 103
 104 static int __init
 105 find_cfe_size(struct mtd_info *mtd, size_t size)
 106 {
 107         struct trx_header *trx;
 108         unsigned char buf[512];
 109         int off;
 110         size_t len;
 111         int blocksize;
 112
 113         trx = (struct trx_header *) buf;
 114
 115         blocksize = mtd->erasesize;
 116         if (blocksize < 0x10000)
 117                 blocksize = 0x10000;
 118
 119         for (off = (128*1024); off < size; off += blocksize) {
 120                 memset(buf, 0xe5, sizeof(buf));
 121
 122                 /*
 123                  * Read into buffer
 124                  */
 125                 if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
 126                     len != sizeof(buf))
 127                         continue;
 128
 129                 /* found a TRX header */
 130                 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
 131                         goto found;
 132                 }
 133         }
 134
 135         printk(KERN_NOTICE
 136                "%s: Couldn't find bootloader size\n",
 137                mtd->name);
 138         return -1;
 139
 140  found:
 141         printk(KERN_NOTICE "bootloader size: %d\n", off);
 142         return off;
 143
 144 }
 145
 146 /*
 147  * Copied from mtdblock.c
 148  *
 149  * Cache stuff...
 150  *
 151  * Since typical flash erasable sectors are much larger than what Linux's
 152  * buffer cache can handle, we must implement read-modify-write on flash
 153  * sectors for each block write requests.  To avoid over-erasing flash sectors
 154  * and to speed things up, we locally cache a whole flash sector while it is
 155  * being written to until a different sector is required.
 156  */
 157
 158 static void erase_callback(struct erase_info *done)
 159 {
 160         wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 161         wake_up(wait_q);
 162 }
 163
 164 static int erase_write (struct mtd_info *mtd, unsigned long pos,
 165                         int len, const char *buf)
 166 {
 167         struct erase_info erase;
 168         DECLARE_WAITQUEUE(wait, current);
 169         wait_queue_head_t wait_q;
 170         size_t retlen;
 171         int ret;
 172
 173         /*
 174          * First, let's erase the flash block.
 175          */
 176
 177         init_waitqueue_head(&wait_q);
 178         erase.mtd = mtd;
 179         erase.callback = erase_callback;
 180         erase.addr = pos;
 181         erase.len = len;
 182         erase.priv = (u_long)&wait_q;
 183
 184         set_current_state(TASK_INTERRUPTIBLE);
 185         add_wait_queue(&wait_q, &wait);
 186
 187         ret = mtd->erase(mtd, &erase);
 188         if (ret) {
 189                 set_current_state(TASK_RUNNING);
 190                 remove_wait_queue(&wait_q, &wait);
 191                 printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
 192                                      "on \"%s\" failed\n",
 193                         pos, len, mtd->name);
 194                 return ret;
 195         }
 196
 197         schedule();  /* Wait for erase to finish. */
 198         remove_wait_queue(&wait_q, &wait);
 199
 200         /*
 201          * Next, writhe data to flash.
 202          */
 203
 204         ret = mtd->write (mtd, pos, len, &retlen, buf);
 205         if (ret)
 206                 return ret;
 207         if (retlen != len)
 208                 return -EIO;
 209         return 0;
 210 }
 211
 212
 213
 214
 215 static int __init
 216 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 217 {
 218         struct trx_header trx, *trx2;
 219         unsigned char buf[512], *block;
 220         int off, blocksize;
 221         u32 i, crc = ~0;
 222         size_t len;
 223         struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 224
 225         blocksize = mtd->erasesize;
 226         if (blocksize < 0x10000)
 227                 blocksize = 0x10000;
 228
 229         for (off = (128*1024); off < size; off += blocksize) {
 230                 memset(&trx, 0xe5, sizeof(trx));
 231
 232                 /*
 233                  * Read into buffer
 234                  */
 235                 if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 236                     len != sizeof(trx))
 237                         continue;
 238
 239                 /* found a TRX header */
 240                 if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 241                         part->offset = le32_to_cpu(trx.offsets[2]) ? :
 242                                 le32_to_cpu(trx.offsets[1]);
 243                         part->size = le32_to_cpu(trx.len);
 244
 245                         part->size -= part->offset;
 246                         part->offset += off;
 247
 248                         goto found;
 249                 }
 250         }
 251
 252         printk(KERN_NOTICE
 253                "%s: Couldn't find root filesystem\n",
 254                mtd->name);
 255         return -1;
 256
 257  found:
 258         if (part->size == 0)
 259                 return 0;
 260
 261         if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 262                 return 0;
 263
 264         if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
 265                 printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", mtd->name, (u32) sb->bytes_used);
 266
 267                 /* Update the squashfs partition size based on the superblock info */
 268                 part->size = sb->bytes_used;
 269                 len = part->offset + part->size;
 270                 len +=  (mtd->erasesize - 1);
 271                 len &= ~(mtd->erasesize - 1);
 272                 part->size = len - part->offset;
 273         } else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) {
 274                 printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name);
 275
 276                 /* Move the squashfs outside of the trx */
 277                 part->size = 0;
 278         } else {
 279                 printk(KERN_INFO "%s: Filesystem type: unknown\n", mtd->name);
 280                 return 0;
 281         }
 282
 283         if (trx.len != part->offset + part->size - off) {
 284                 /* Update the trx offsets and length */
 285                 trx.len = part->offset + part->size - off;
 286
 287                 /* Update the trx crc32 */
 288                 for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 289                         if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 290                                 return 0;
 291                         crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 292                 }
 293                 trx.crc32 = crc;
 294
 295                 /* read first eraseblock from the trx */
 296                 block = kmalloc(mtd->erasesize, GFP_KERNEL);
 297                 trx2 = (struct trx_header *) block;
 298                 if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 299                         printk("Error accessing the first trx eraseblock\n");
 300                         return 0;
 301                 }
 302
 303                 printk("Updating TRX offsets and length:\n");
 304                 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);
 305                 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);
 306
 307                 /* Write updated trx header to the flash */
 308                 memcpy(block, &trx, sizeof(trx));
 309                 if (mtd->unlock)
 310                         mtd->unlock(mtd, off, mtd->erasesize);
 311                 erase_write(mtd, off, mtd->erasesize, block);
 312                 if (mtd->sync)
 313                         mtd->sync(mtd);
 314                 kfree(block);
 315                 printk("Done\n");
 316         }
 317
 318         return part->size;
 319 }
 320
 321 struct mtd_partition * __init
 322 init_mtd_partitions(struct mtd_info *mtd, size_t size)
 323 {
 324         int cfe_size;
 325
 326         if ((cfe_size = find_cfe_size(mtd,size)) < 0)
 327                 return NULL;
 328
 329         /* boot loader */
 330         bcm963xx_parts[0].offset = 0;
 331         bcm963xx_parts[0].size   = cfe_size;
 332
 333         /* nvram */
 334         if (cfe_size != 384 * 1024) {
 335                 bcm963xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 336                 bcm963xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 337         } else {
 338                 /* nvram (old 128kb config partition on netgear wgt634u) */
 339                 bcm963xx_parts[3].offset = bcm963xx_parts[0].size;
 340                 bcm963xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 341         }
 342
 343         /* linux (kernel and rootfs) */
 344         if (cfe_size != 384 * 1024) {
 345                 bcm963xx_parts[1].offset = bcm963xx_parts[0].size;
 346                 bcm963xx_parts[1].size   = bcm963xx_parts[3].offset -
 347                         bcm963xx_parts[1].offset;
 348         } else {
 349                 /* do not count the elf loader, which is on one block */
 350                 bcm963xx_parts[1].offset = bcm963xx_parts[0].size +
 351                         bcm963xx_parts[3].size + mtd->erasesize;
 352                 bcm963xx_parts[1].size   = size -
 353                         bcm963xx_parts[0].size -
 354                         (2*bcm963xx_parts[3].size) -
 355                         mtd->erasesize;
 356         }
 357
 358         /* find and size rootfs */
 359         if (find_root(mtd,size,&bcm963xx_parts[2])==0) {
 360                 /* entirely jffs2 */
 361                 bcm963xx_parts[4].name = NULL;
 362                 bcm963xx_parts[2].size = size - bcm963xx_parts[2].offset -
 363                                 bcm963xx_parts[3].size;
 364         } else {
 365                 /* legacy setup */
 366                 /* calculate leftover flash, and assign it to the jffs2 partition */
 367                 if (cfe_size != 384 * 1024) {
 368                         bcm963xx_parts[4].offset = bcm963xx_parts[2].offset +
 369                                 bcm963xx_parts[2].size;
 370                         if ((bcm963xx_parts[4].offset % mtd->erasesize) > 0) {
 371                                 bcm963xx_parts[4].offset += mtd->erasesize -
 372                                         (bcm963xx_parts[4].offset % mtd->erasesize);
 373                         }
 374                         bcm963xx_parts[4].size = bcm963xx_parts[3].offset -
 375                                 bcm963xx_parts[4].offset;
 376                 } else {
 377                         bcm963xx_parts[4].offset = bcm963xx_parts[2].offset +
 378                                 bcm963xx_parts[2].size;
 379                         if ((bcm963xx_parts[4].offset % mtd->erasesize) > 0) {
 380                                 bcm963xx_parts[4].offset += mtd->erasesize -
 381                                         (bcm963xx_parts[4].offset % mtd->erasesize);
 382                         }
 383                         bcm963xx_parts[4].size = size - bcm963xx_parts[3].size -
 384                                 bcm963xx_parts[4].offset;
 385                 }
 386         }
 387
 388         return bcm963xx_parts;
 389 }
 390 #endif
 391
 392 int __init init_bcm963xx_map(void)
 393 {
 394         size_t size;
 395         int ret = 0;
 396 #ifdef CONFIG_MTD_PARTITIONS
 397         struct mtd_partition *parts;
 398         int i;
 399 #endif
 400
 401         printk("BCM963xx flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
 402         bcm963xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
 403
 404         if (!bcm963xx_map.virt) {
 405                 printk("Failed to ioremap\n");
 406                 return -EIO;
 407         }
 408         simple_map_init(&bcm963xx_map);
 409
 410         if (!(bcm963xx_mtd = do_map_probe("cfi_probe", &bcm963xx_map))) {
 411                 printk("Failed to do_map_probe\n");
 412                 iounmap((void *)bcm963xx_map.virt);
 413                 return -ENXIO;
 414         }
 415
 416         bcm963xx_mtd->owner = THIS_MODULE;
 417
 418         size = bcm963xx_mtd->size;
 419
 420         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
 421
 422 #ifdef CONFIG_MTD_PARTITIONS
 423         if (boot_loader_type == BOOT_LOADER_CFE) {
 424                 parts = init_mtd_partitions(bcm963xx_mtd, size);
 425                 for (i = 0; parts[i].name; i++);
 426                         ret = add_mtd_partitions(bcm963xx_mtd, parts, i);
 427                 if (ret) {
 428                         printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 429                         goto fail;
 430                 }
 431         }
 432         else {
 433                 int parsed_nr_parts = 0;
 434                 char * part_type;
 435
 436                 if (bcm963xx_mtd->size > 0x00400000) {
 437                         printk("Support for extended flash memory size : 0x%08X ; ONLY 64MBIT SUPPORT\n", bcm963xx_mtd->size);
 438                         bcm963xx_map.virt = (unsigned long)EXTENDED_SIZE;
 439                 }
 440
 441 #ifdef CONFIG_MTD_REDBOOT_PARTS
 442                 if (parsed_nr_parts == 0) {
 443                         int ret = parse_redboot_partitions(bcm963xx_mtd, &parsed_parts, 0);
 444                         if (ret > 0) {
 445                                 part_type = "RedBoot";
 446                                 parsed_nr_parts = ret;
 447                         }
 448                 }
 449 #endif
 450                 add_mtd_partitions(bcm963xx_mtd, parsed_parts, parsed_nr_parts);
 451 #endif
 452         }
 453         return 0;
 454
 455  fail:
 456         if (bcm963xx_mtd)
 457                 map_destroy(bcm963xx_mtd);
 458         if (bcm963xx_map.virt)
 459                 iounmap((void *)bcm963xx_map.virt);
 460         bcm963xx_map.virt = 0;
 461         return ret;
 462 }
 463
 464 void __exit cleanup_bcm963xx_map(void)
 465 {
 466 #ifdef CONFIG_MTD_PARTITIONS
 467         del_mtd_partitions(bcm963xx_mtd);
 468 #endif
 469         map_destroy(bcm963xx_mtd);
 470         iounmap((void *)bcm963xx_map.virt);
 471 }
 472
 473 module_init(init_bcm963xx_map);
 474 module_exit(cleanup_bcm963xx_map);