target/linux/brcm47xx/files-2.6.25/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
 226
 227 static int __init
 228 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 229 {
 230         struct trx_header trx, *trx2;
 231         unsigned char buf[512], *block;
 232         int off, blocksize;
 233         u32 i, crc = ~0;
 234         size_t len;
 235         struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 236
 237         blocksize = mtd->erasesize;
 238         if (blocksize < 0x10000)
 239                 blocksize = 0x10000;
 240
 241         for (off = (128*1024); off < size; off += blocksize) {
 242                 memset(&trx, 0xe5, sizeof(trx));
 243
 244                 /*
 245                  * Read into buffer
 246                  */
 247                 if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 248                     len != sizeof(trx))
 249                         continue;
 250
 251                 /* found a TRX header */
 252                 if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 253                         part->offset = le32_to_cpu(trx.offsets[2]) ? :
 254                                 le32_to_cpu(trx.offsets[1]);
 255                         part->size = le32_to_cpu(trx.len);
 256
 257                         part->size -= part->offset;
 258                         part->offset += off;
 259
 260                         goto found;
 261                 }
 262         }
 263
 264         printk(KERN_NOTICE
 265                "%s: Couldn't find root filesystem\n",
 266                mtd->name);
 267         return -1;
 268
 269  found:
 270         if (part->size == 0)
 271                 return 0;
 272
 273         if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 274                 return 0;
 275
 276         /* Move the fs outside of the trx */
 277         part->size = 0;
 278
 279         if (trx.len != part->offset + part->size - off) {
 280                 /* Update the trx offsets and length */
 281                 trx.len = part->offset + part->size - off;
 282
 283                 /* Update the trx crc32 */
 284                 for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 285                         if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 286                                 return 0;
 287                         crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 288                 }
 289                 trx.crc32 = crc;
 290
 291                 /* read first eraseblock from the trx */
 292                 block = kmalloc(mtd->erasesize, GFP_KERNEL);
 293                 trx2 = (struct trx_header *) block;
 294                 if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 295                         printk("Error accessing the first trx eraseblock\n");
 296                         return 0;
 297                 }
 298
 299                 printk("Updating TRX offsets and length:\n");
 300                 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);
 301                 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);
 302
 303                 /* Write updated trx header to the flash */
 304                 memcpy(block, &trx, sizeof(trx));
 305                 if (mtd->unlock)
 306                         mtd->unlock(mtd, off, mtd->erasesize);
 307                 erase_write(mtd, off, mtd->erasesize, block);
 308                 if (mtd->sync)
 309                         mtd->sync(mtd);
 310                 kfree(block);
 311                 printk("Done\n");
 312         }
 313
 314         return part->size;
 315 }
 316
 317 struct mtd_partition * __init
 318 init_mtd_partitions(struct mtd_info *mtd, size_t size)
 319 {
 320         int cfe_size;
 321
 322         if ((cfe_size = find_cfe_size(mtd,size)) < 0)
 323                 return NULL;
 324
 325         /* boot loader */
 326         bcm47xx_parts[0].offset = 0;
 327         bcm47xx_parts[0].size   = cfe_size;
 328
 329         /* nvram */
 330         if (cfe_size != 384 * 1024) {
 331                 bcm47xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 332                 bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 333         } else {
 334                 /* nvram (old 128kb config partition on netgear wgt634u) */
 335                 bcm47xx_parts[3].offset = bcm47xx_parts[0].size;
 336                 bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 337         }
 338
 339         /* linux (kernel and rootfs) */
 340         if (cfe_size != 384 * 1024) {
 341                 bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
 342                 bcm47xx_parts[1].size   = bcm47xx_parts[3].offset -
 343                         bcm47xx_parts[1].offset;
 344         } else {
 345                 /* do not count the elf loader, which is on one block */
 346                 bcm47xx_parts[1].offset = bcm47xx_parts[0].size +
 347                         bcm47xx_parts[3].size + mtd->erasesize;
 348                 bcm47xx_parts[1].size   = size -
 349                         bcm47xx_parts[0].size -
 350                         (2*bcm47xx_parts[3].size) -
 351                         mtd->erasesize;
 352         }
 353
 354         /* find and size rootfs */
 355         find_root(mtd,size,&bcm47xx_parts[2]);
 356         bcm47xx_parts[2].size = size - bcm47xx_parts[2].offset - bcm47xx_parts[3].size;
 357
 358         return bcm47xx_parts;
 359 }
 360 #endif
 361
 362 int __init init_bcm47xx_map(void)
 363 {
 364 #ifdef CONFIG_SSB
 365         struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
 366 #endif
 367         size_t size;
 368         int ret = 0;
 369 #ifdef CONFIG_MTD_PARTITIONS
 370         struct mtd_partition *parts;
 371         int i;
 372 #endif
 373
 374 #ifdef CONFIG_SSB
 375         u32 window = mcore->flash_window;
 376         u32 window_size = mcore->flash_window_size;
 377
 378         printk("flash init: 0x%08x 0x%08x\n", window, window_size);
 379         bcm47xx_map.phys = window;
 380         bcm47xx_map.size = window_size;
 381         bcm47xx_map.virt = ioremap_nocache(window, window_size);
 382 #else
 383         printk("flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
 384         bcm47xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
 385 #endif
 386
 387         if (!bcm47xx_map.virt) {
 388                 printk("Failed to ioremap\n");
 389                 return -EIO;
 390         }
 391
 392         simple_map_init(&bcm47xx_map);
 393
 394         if (!(bcm47xx_mtd = do_map_probe("cfi_probe", &bcm47xx_map))) {
 395                 printk("Failed to do_map_probe\n");
 396                 iounmap((void *)bcm47xx_map.virt);
 397                 return -ENXIO;
 398         }
 399
 400         /* override copy_from routine */
 401         bcm47xx_map.copy_from = bcm47xx_map_copy_from;
 402
 403         bcm47xx_mtd->owner = THIS_MODULE;
 404
 405         size = bcm47xx_mtd->size;
 406
 407         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
 408
 409 #ifdef CONFIG_MTD_PARTITIONS
 410         parts = init_mtd_partitions(bcm47xx_mtd, size);
 411         for (i = 0; parts[i].name; i++);
 412         ret = add_mtd_partitions(bcm47xx_mtd, parts, i);
 413         if (ret) {
 414                 printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 415                 goto fail;
 416         }
 417 #endif
 418         return 0;
 419
 420  fail:
 421         if (bcm47xx_mtd)
 422                 map_destroy(bcm47xx_mtd);
 423         if (bcm47xx_map.virt)
 424                 iounmap((void *)bcm47xx_map.virt);
 425         bcm47xx_map.virt = 0;
 426         return ret;
 427 }
 428
 429 void __exit cleanup_bcm47xx_map(void)
 430 {
 431 #ifdef CONFIG_MTD_PARTITIONS
 432         del_mtd_partitions(bcm47xx_mtd);
 433 #endif
 434         map_destroy(bcm47xx_mtd);
 435         iounmap((void *)bcm47xx_map.virt);
 436 }
 437
 438 module_init(init_bcm47xx_map);
 439 module_exit(cleanup_bcm47xx_map);