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 #include <linux/ssb/ssb.h>
  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 extern struct ssb_bus ssb;
  78 static struct mtd_info *bcm947xx_mtd;
  79
  80 static void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  81 {
  82 #define MIPS_MEMCPY_ALIGN 4
  83         map_word ret;
  84         ssize_t transfer;
  85         ssize_t done = 0;
  86         if ((len >= MIPS_MEMCPY_ALIGN) && (!(from & (MIPS_MEMCPY_ALIGN - 1))) && (!(((unsigned int)to & (MIPS_MEMCPY_ALIGN - 1))))) {
  87                 done = len & ~(MIPS_MEMCPY_ALIGN - 1);
  88                 memcpy_fromio(to, map->virt + from, done);
  89         }
  90         while (done < len) {
  91                 ret = map->read(map, from + done);
  92                 transfer = len - done;
  93                 if (transfer > map->bankwidth)
  94                         transfer = map->bankwidth;
  95                 memcpy((void *)((unsigned long)to + done), &ret.x[0], transfer);
  96                 done += transfer;
  97         }
  98 }
  99
 100 static struct map_info bcm947xx_map = {
 101         name: "Physically mapped flash",
 102         size: WINDOW_SIZE,
 103         bankwidth: BUSWIDTH,
 104         phys: WINDOW_ADDR,
 105 };
 106
 107 #ifdef CONFIG_MTD_PARTITIONS
 108
 109 static struct mtd_partition bcm947xx_parts[] = {
 110         { name: "cfe",  offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
 111         { name: "linux", offset: 0, size: 0, },
 112         { name: "rootfs", offset: 0, size: 0, },
 113         { name: "nvram", offset: 0, size: 0, },
 114         { name: "OpenWrt", offset: 0, size: 0, },
 115         { name: NULL, },
 116 };
 117
 118 static int __init
 119 find_cfe_size(struct mtd_info *mtd, size_t size)
 120 {
 121         struct trx_header *trx;
 122         unsigned char buf[512];
 123         int off;
 124         size_t len;
 125         int blocksize;
 126
 127         trx = (struct trx_header *) buf;
 128
 129         blocksize = mtd->erasesize;
 130         if (blocksize < 0x10000)
 131                 blocksize = 0x10000;
 132
 133         for (off = (128*1024); off < size; off += blocksize) {
 134                 memset(buf, 0xe5, sizeof(buf));
 135
 136                 /*
 137                  * Read into buffer
 138                  */
 139                 if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
 140                     len != sizeof(buf))
 141                         continue;
 142
 143                 /* found a TRX header */
 144                 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
 145                         goto found;
 146                 }
 147         }
 148
 149         printk(KERN_NOTICE
 150                "%s: Couldn't find bootloader size\n",
 151                mtd->name);
 152         return -1;
 153
 154  found:
 155         printk(KERN_NOTICE "bootloader size: %d\n", off);
 156         return off;
 157
 158 }
 159
 160 /*
 161  * Copied from mtdblock.c
 162  *
 163  * Cache stuff...
 164  *
 165  * Since typical flash erasable sectors are much larger than what Linux's
 166  * buffer cache can handle, we must implement read-modify-write on flash
 167  * sectors for each block write requests.  To avoid over-erasing flash sectors
 168  * and to speed things up, we locally cache a whole flash sector while it is
 169  * being written to until a different sector is required.
 170  */
 171
 172 static void erase_callback(struct erase_info *done)
 173 {
 174         wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 175         wake_up(wait_q);
 176 }
 177
 178 static int erase_write (struct mtd_info *mtd, unsigned long pos,
 179                         int len, const char *buf)
 180 {
 181         struct erase_info erase;
 182         DECLARE_WAITQUEUE(wait, current);
 183         wait_queue_head_t wait_q;
 184         size_t retlen;
 185         int ret;
 186
 187         /*
 188          * First, let's erase the flash block.
 189          */
 190
 191         init_waitqueue_head(&wait_q);
 192         erase.mtd = mtd;
 193         erase.callback = erase_callback;
 194         erase.addr = pos;
 195         erase.len = len;
 196         erase.priv = (u_long)&wait_q;
 197
 198         set_current_state(TASK_INTERRUPTIBLE);
 199         add_wait_queue(&wait_q, &wait);
 200
 201         ret = mtd->erase(mtd, &erase);
 202         if (ret) {
 203                 set_current_state(TASK_RUNNING);
 204                 remove_wait_queue(&wait_q, &wait);
 205                 printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
 206                                      "on \"%s\" failed\n",
 207                         pos, len, mtd->name);
 208                 return ret;
 209         }
 210
 211         schedule();  /* Wait for erase to finish. */
 212         remove_wait_queue(&wait_q, &wait);
 213
 214         /*
 215          * Next, writhe data to flash.
 216          */
 217
 218         ret = mtd->write (mtd, pos, len, &retlen, buf);
 219         if (ret)
 220                 return ret;
 221         if (retlen != len)
 222                 return -EIO;
 223         return 0;
 224 }
 225
 226
 227
 228
 229 static int __init
 230 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 231 {
 232         struct trx_header trx, *trx2;
 233         unsigned char buf[512], *block;
 234         int off, blocksize;
 235         u32 i, crc = ~0;
 236         size_t len;
 237         struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 238
 239         blocksize = mtd->erasesize;
 240         if (blocksize < 0x10000)
 241                 blocksize = 0x10000;
 242
 243         for (off = (128*1024); off < size; off += blocksize) {
 244                 memset(&trx, 0xe5, sizeof(trx));
 245
 246                 /*
 247                  * Read into buffer
 248                  */
 249                 if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 250                     len != sizeof(trx))
 251                         continue;
 252
 253                 /* found a TRX header */
 254                 if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 255                         part->offset = le32_to_cpu(trx.offsets[2]) ? :
 256                                 le32_to_cpu(trx.offsets[1]);
 257                         part->size = le32_to_cpu(trx.len);
 258
 259                         part->size -= part->offset;
 260                         part->offset += off;
 261
 262                         goto found;
 263                 }
 264         }
 265
 266         printk(KERN_NOTICE
 267                "%s: Couldn't find root filesystem\n",
 268                mtd->name);
 269         return -1;
 270
 271  found:
 272         if (part->size == 0)
 273                 return 0;
 274
 275         if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 276                 return 0;
 277
 278         if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
 279                 printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", mtd->name, (u32) sb->bytes_used);
 280
 281                 /* Update the squashfs partition size based on the superblock info */
 282                 part->size = sb->bytes_used;
 283                 len = part->offset + part->size;
 284                 len +=  (mtd->erasesize - 1);
 285                 len &= ~(mtd->erasesize - 1);
 286                 part->size = len - part->offset;
 287         } else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) {
 288                 printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name);
 289
 290                 /* Move the squashfs outside of the trx */
 291                 part->size = 0;
 292         } else {
 293                 printk(KERN_INFO "%s: Filesystem type: unknown\n", mtd->name);
 294                 return 0;
 295         }
 296
 297         if (trx.len != part->offset + part->size - off) {
 298                 /* Update the trx offsets and length */
 299                 trx.len = part->offset + part->size - off;
 300
 301                 /* Update the trx crc32 */
 302                 for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 303                         if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 304                                 return 0;
 305                         crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 306                 }
 307                 trx.crc32 = crc;
 308
 309                 /* read first eraseblock from the trx */
 310                 block = kmalloc(mtd->erasesize, GFP_KERNEL);
 311                 trx2 = (struct trx_header *) block;
 312                 if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 313                         printk("Error accessing the first trx eraseblock\n");
 314                         return 0;
 315                 }
 316
 317                 printk("Updating TRX offsets and length:\n");
 318                 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);
 319                 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);
 320
 321                 /* Write updated trx header to the flash */
 322                 memcpy(block, &trx, sizeof(trx));
 323                 if (mtd->unlock)
 324                         mtd->unlock(mtd, off, mtd->erasesize);
 325                 erase_write(mtd, off, mtd->erasesize, block);
 326                 if (mtd->sync)
 327                         mtd->sync(mtd);
 328                 kfree(block);
 329                 printk("Done\n");
 330         }
 331
 332         return part->size;
 333 }
 334
 335 struct mtd_partition * __init
 336 init_mtd_partitions(struct mtd_info *mtd, size_t size)
 337 {
 338         int cfe_size;
 339
 340         if ((cfe_size = find_cfe_size(mtd,size)) < 0)
 341                 return NULL;
 342
 343         /* boot loader */
 344         bcm947xx_parts[0].offset = 0;
 345         bcm947xx_parts[0].size   = cfe_size;
 346
 347         /* nvram */
 348         if (cfe_size != 384 * 1024) {
 349                 bcm947xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 350                 bcm947xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 351         } else {
 352                 /* nvram (old 128kb config partition on netgear wgt634u) */
 353                 bcm947xx_parts[3].offset = bcm947xx_parts[0].size;
 354                 bcm947xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 355         }
 356
 357         /* linux (kernel and rootfs) */
 358         if (cfe_size != 384 * 1024) {
 359                 bcm947xx_parts[1].offset = bcm947xx_parts[0].size;
 360                 bcm947xx_parts[1].size   = bcm947xx_parts[3].offset -
 361                         bcm947xx_parts[1].offset;
 362         } else {
 363                 /* do not count the elf loader, which is on one block */
 364                 bcm947xx_parts[1].offset = bcm947xx_parts[0].size +
 365                         bcm947xx_parts[3].size + mtd->erasesize;
 366                 bcm947xx_parts[1].size   = size -
 367                         bcm947xx_parts[0].size -
 368                         (2*bcm947xx_parts[3].size) -
 369                         mtd->erasesize;
 370         }
 371
 372         /* find and size rootfs */
 373         if (find_root(mtd,size,&bcm947xx_parts[2])==0) {
 374                 /* entirely jffs2 */
 375                 bcm947xx_parts[4].name = NULL;
 376                 bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset -
 377                                 bcm947xx_parts[3].size;
 378         } else {
 379                 /* legacy setup */
 380                 /* calculate leftover flash, and assign it to the jffs2 partition */
 381                 if (cfe_size != 384 * 1024) {
 382                         bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
 383                                 bcm947xx_parts[2].size;
 384                         if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
 385                                 bcm947xx_parts[4].offset += mtd->erasesize -
 386                                         (bcm947xx_parts[4].offset % mtd->erasesize);
 387                         }
 388                         bcm947xx_parts[4].size = bcm947xx_parts[3].offset -
 389                                 bcm947xx_parts[4].offset;
 390                 } else {
 391                         bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
 392                                 bcm947xx_parts[2].size;
 393                         if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
 394                                 bcm947xx_parts[4].offset += mtd->erasesize -
 395                                         (bcm947xx_parts[4].offset % mtd->erasesize);
 396                         }
 397                         bcm947xx_parts[4].size = size - bcm947xx_parts[3].size -
 398                                 bcm947xx_parts[4].offset;
 399                 }
 400         }
 401
 402         return bcm947xx_parts;
 403 }
 404 #endif
 405
 406 int __init init_bcm947xx_map(void)
 407 {
 408         struct ssb_mipscore *mcore = &ssb.mipscore;
 409         size_t size;
 410         int ret = 0;
 411 #ifdef CONFIG_MTD_PARTITIONS
 412         struct mtd_partition *parts;
 413         int i;
 414 #endif
 415         u32 window = mcore->flash_window;
 416         u32 window_size = mcore->flash_window_size;
 417
 418         printk("flash init: 0x%08x 0x%08x\n", window, window_size);
 419         bcm947xx_map.phys = window;
 420         bcm947xx_map.size = window_size;
 421         bcm947xx_map.virt = ioremap_nocache(window, window_size);
 422
 423         if (!bcm947xx_map.virt) {
 424                 printk("Failed to ioremap\n");
 425                 return -EIO;
 426         }
 427         simple_map_init(&bcm947xx_map);
 428
 429         bcm947xx_map.copy_from = bcm947xx_map_copy_from;
 430
 431         if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
 432                 printk("Failed to do_map_probe\n");
 433                 iounmap((void *)bcm947xx_map.virt);
 434                 return -ENXIO;
 435         }
 436
 437         bcm947xx_mtd->owner = THIS_MODULE;
 438
 439         size = bcm947xx_mtd->size;
 440
 441         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
 442
 443 #ifdef CONFIG_MTD_PARTITIONS
 444         parts = init_mtd_partitions(bcm947xx_mtd, size);
 445         for (i = 0; parts[i].name; i++);
 446         ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
 447         if (ret) {
 448                 printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 449                 goto fail;
 450         }
 451 #endif
 452         return 0;
 453
 454  fail:
 455         if (bcm947xx_mtd)
 456                 map_destroy(bcm947xx_mtd);
 457         if (bcm947xx_map.virt)
 458                 iounmap((void *)bcm947xx_map.virt);
 459         bcm947xx_map.virt = 0;
 460         return ret;
 461 }
 462
 463 void __exit cleanup_bcm947xx_map(void)
 464 {
 465 #ifdef CONFIG_MTD_PARTITIONS
 466         del_mtd_partitions(bcm947xx_mtd);
 467 #endif
 468         map_destroy(bcm947xx_mtd);
 469         iounmap((void *)bcm947xx_map.virt);
 470 }
 471
 472 module_init(init_bcm947xx_map);
 473 module_exit(cleanup_bcm947xx_map);