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