target/linux/adm5120-2.6/files/drivers/mtd/maps/adm5120_mtd.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 ADM5120 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 #include <asm/mach-adm5120/myloader.h>
  54 #include <asm/mach-adm5120/adm5120_info.h>
  55
  56 extern int parse_myloader_partitions(struct mtd_info *master,
  57                         struct mtd_partition **pparts,
  58                         unsigned long origin);
  59
  60 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  61 #define TRX_VERSION     1
  62 #define TRX_MAX_LEN     0x3A0000
  63 #define TRX_NO_HEADER   1               /* Do not write TRX header */
  64 #define TRX_GZ_FILES    0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
  65 #define TRX_MAX_OFFSET  3
  66
  67 struct trx_header {
  68         u32 magic;              /* "HDR0" */
  69         u32 len;                /* Length of file including header */
  70         u32 crc32;              /* 32-bit CRC from flag_version to end of file */
  71         u32 flag_version;       /* 0:15 flags, 16:31 version */
  72         u32 offsets[TRX_MAX_OFFSET];    /* Offsets of partitions from start of header */
  73 };
  74
  75 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
  76 #define NVRAM_SPACE 0x8000
  77 #define WINDOW_ADDR 0x1fc00000
  78 #define WINDOW_SIZE 0x400000
  79 #define BUSWIDTH 2
  80
  81 static struct mtd_info *adm5120_mtd;
  82
  83 static struct map_info adm5120_map = {
  84         name: "adm5120 physically mapped flash",
  85         size: WINDOW_SIZE,
  86         bankwidth: BUSWIDTH,
  87         phys: WINDOW_ADDR,
  88 };
  89
  90 #ifdef CONFIG_MTD_PARTITIONS
  91
  92 static struct mtd_partition adm5120_cfe_parts[] = {
  93         { name: "cfe",  offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
  94         { name: "linux", offset: 0, size: 0, },
  95         { name: "rootfs", offset: 0, size: 0, },
  96         { name: "nvram", offset: 0, size: 0, },
  97         { name: "OpenWrt", offset: 0, size: 0, },
  98         { name: NULL, },
  99 };
 100
 101 static int __init
 102 find_cfe_size(struct mtd_info *mtd, size_t size)
 103 {
 104         struct trx_header *trx;
 105         unsigned char buf[512];
 106         int off;
 107         size_t len;
 108         int blocksize;
 109
 110         trx = (struct trx_header *) buf;
 111
 112         blocksize = mtd->erasesize;
 113         if (blocksize < 0x10000)
 114                 blocksize = 0x10000;
 115
 116         for (off = (128*1024); off < size; off += blocksize) {
 117                 memset(buf, 0xe5, sizeof(buf));
 118
 119                 /*
 120                  * Read into buffer
 121                  */
 122                 if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
 123                     len != sizeof(buf))
 124                         continue;
 125
 126                 /* found a TRX header */
 127                 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
 128                         goto found;
 129                 }
 130         }
 131
 132         printk(KERN_NOTICE
 133                "%s: Couldn't find bootloader size\n",
 134                mtd->name);
 135         return -1;
 136
 137  found:
 138         printk(KERN_NOTICE "bootloader size: %d\n", off);
 139         return off;
 140
 141 }
 142
 143 /*
 144  * Copied from mtdblock.c
 145  *
 146  * Cache stuff...
 147  *
 148  * Since typical flash erasable sectors are much larger than what Linux's
 149  * buffer cache can handle, we must implement read-modify-write on flash
 150  * sectors for each block write requests.  To avoid over-erasing flash sectors
 151  * and to speed things up, we locally cache a whole flash sector while it is
 152  * being written to until a different sector is required.
 153  */
 154
 155 static void erase_callback(struct erase_info *done)
 156 {
 157         wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 158         wake_up(wait_q);
 159 }
 160
 161 static int erase_write (struct mtd_info *mtd, unsigned long pos,
 162                         int len, const char *buf)
 163 {
 164         struct erase_info erase;
 165         DECLARE_WAITQUEUE(wait, current);
 166         wait_queue_head_t wait_q;
 167         size_t retlen;
 168         int ret;
 169
 170         /*
 171          * First, let's erase the flash block.
 172          */
 173
 174         init_waitqueue_head(&wait_q);
 175         erase.mtd = mtd;
 176         erase.callback = erase_callback;
 177         erase.addr = pos;
 178         erase.len = len;
 179         erase.priv = (u_long)&wait_q;
 180
 181         set_current_state(TASK_INTERRUPTIBLE);
 182         add_wait_queue(&wait_q, &wait);
 183
 184         ret = mtd->erase(mtd, &erase);
 185         if (ret) {
 186                 set_current_state(TASK_RUNNING);
 187                 remove_wait_queue(&wait_q, &wait);
 188                 printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
 189                                      "on \"%s\" failed\n",
 190                         pos, len, mtd->name);
 191                 return ret;
 192         }
 193
 194         schedule();  /* Wait for erase to finish. */
 195         remove_wait_queue(&wait_q, &wait);
 196
 197         /*
 198          * Next, writhe data to flash.
 199          */
 200
 201         ret = mtd->write (mtd, pos, len, &retlen, buf);
 202         if (ret)
 203                 return ret;
 204         if (retlen != len)
 205                 return -EIO;
 206         return 0;
 207 }
 208
 209
 210
 211
 212 static int __init
 213 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 214 {
 215         struct trx_header trx, *trx2;
 216         unsigned char buf[512], *block;
 217         int off, blocksize;
 218         u32 i, crc = ~0;
 219         size_t len;
 220         struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 221
 222         blocksize = mtd->erasesize;
 223         if (blocksize < 0x10000)
 224                 blocksize = 0x10000;
 225
 226         for (off = (128*1024); off < size; off += blocksize) {
 227                 memset(&trx, 0xe5, sizeof(trx));
 228
 229                 /*
 230                  * Read into buffer
 231                  */
 232                 if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 233                     len != sizeof(trx))
 234                         continue;
 235
 236                 /* found a TRX header */
 237                 if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 238                         part->offset = le32_to_cpu(trx.offsets[2]) ? :
 239                                 le32_to_cpu(trx.offsets[1]);
 240                         part->size = le32_to_cpu(trx.len);
 241
 242                         part->size -= part->offset;
 243                         part->offset += off;
 244
 245                         goto found;
 246                 }
 247         }
 248
 249         printk(KERN_NOTICE
 250                "%s: Couldn't find root filesystem\n",
 251                mtd->name);
 252         return -1;
 253
 254  found:
 255         if (part->size == 0)
 256                 return 0;
 257
 258         if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 259                 return 0;
 260
 261         if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
 262                 printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", mtd->name, (u32) sb->bytes_used);
 263
 264                 /* Update the squashfs partition size based on the superblock info */
 265                 part->size = sb->bytes_used;
 266                 len = part->offset + part->size;
 267                 len +=  (mtd->erasesize - 1);
 268                 len &= ~(mtd->erasesize - 1);
 269                 part->size = len - part->offset;
 270         } else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) {
 271                 printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name);
 272
 273                 /* Move the squashfs outside of the trx */
 274                 part->size = 0;
 275         } else {
 276                 printk(KERN_INFO "%s: Filesystem type: unknown\n", mtd->name);
 277                 return 0;
 278         }
 279
 280         if (trx.len != part->offset + part->size - off) {
 281                 /* Update the trx offsets and length */
 282                 trx.len = part->offset + part->size - off;
 283
 284                 /* Update the trx crc32 */
 285                 for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 286                         if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 287                                 return 0;
 288                         crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 289                 }
 290                 trx.crc32 = crc;
 291
 292                 /* read first eraseblock from the trx */
 293                 block = kmalloc(mtd->erasesize, GFP_KERNEL);
 294                 trx2 = (struct trx_header *) block;
 295                 if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 296                         printk("Error accessing the first trx eraseblock\n");
 297                         return 0;
 298                 }
 299
 300                 printk("Updating TRX offsets and length:\n");
 301                 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);
 302                 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);
 303
 304                 /* Write updated trx header to the flash */
 305                 memcpy(block, &trx, sizeof(trx));
 306                 if (mtd->unlock)
 307                         mtd->unlock(mtd, off, mtd->erasesize);
 308                 erase_write(mtd, off, mtd->erasesize, block);
 309                 if (mtd->sync)
 310                         mtd->sync(mtd);
 311                 kfree(block);
 312                 printk("Done\n");
 313         }
 314
 315         return part->size;
 316 }
 317
 318 struct mtd_partition * __init
 319 init_mtd_partitions(struct mtd_info *mtd, size_t size)
 320 {
 321         int cfe_size;
 322
 323         if ((cfe_size = find_cfe_size(mtd,size)) < 0)
 324                 return NULL;
 325
 326         /* boot loader */
 327         adm5120_cfe_parts[0].offset = 0;
 328         adm5120_cfe_parts[0].size   = cfe_size;
 329
 330         /* nvram */
 331         if (cfe_size != 384 * 1024) {
 332                 adm5120_cfe_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 333                 adm5120_cfe_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 334         } else {
 335                 /* nvram (old 128kb config partition on netgear wgt634u) */
 336                 adm5120_cfe_parts[3].offset = adm5120_cfe_parts[0].size;
 337                 adm5120_cfe_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 338         }
 339
 340         /* linux (kernel and rootfs) */
 341         if (cfe_size != 384 * 1024) {
 342                 adm5120_cfe_parts[1].offset = adm5120_cfe_parts[0].size;
 343                 adm5120_cfe_parts[1].size   = adm5120_cfe_parts[3].offset -
 344                         adm5120_cfe_parts[1].offset;
 345         } else {
 346                 /* do not count the elf loader, which is on one block */
 347                 adm5120_cfe_parts[1].offset = adm5120_cfe_parts[0].size +
 348                         adm5120_cfe_parts[3].size + mtd->erasesize;
 349                 adm5120_cfe_parts[1].size   = size -
 350                         adm5120_cfe_parts[0].size -
 351                         (2*adm5120_cfe_parts[3].size) -
 352                         mtd->erasesize;
 353         }
 354
 355         /* find and size rootfs */
 356         if (find_root(mtd,size,&adm5120_cfe_parts[2])==0) {
 357                 /* entirely jffs2 */
 358                 adm5120_cfe_parts[4].name = NULL;
 359                 adm5120_cfe_parts[2].size = size - adm5120_cfe_parts[2].offset -
 360                                 adm5120_cfe_parts[3].size;
 361         } else {
 362                 /* legacy setup */
 363                 /* calculate leftover flash, and assign it to the jffs2 partition */
 364                 if (cfe_size != 384 * 1024) {
 365                         adm5120_cfe_parts[4].offset = adm5120_cfe_parts[2].offset +
 366                                 adm5120_cfe_parts[2].size;
 367                         if ((adm5120_cfe_parts[4].offset % mtd->erasesize) > 0) {
 368                                 adm5120_cfe_parts[4].offset += mtd->erasesize -
 369                                         (adm5120_cfe_parts[4].offset % mtd->erasesize);
 370                         }
 371                         adm5120_cfe_parts[4].size = adm5120_cfe_parts[3].offset -
 372                                 adm5120_cfe_parts[4].offset;
 373                 } else {
 374                         adm5120_cfe_parts[4].offset = adm5120_cfe_parts[2].offset +
 375                                 adm5120_cfe_parts[2].size;
 376                         if ((adm5120_cfe_parts[4].offset % mtd->erasesize) > 0) {
 377                                 adm5120_cfe_parts[4].offset += mtd->erasesize -
 378                                         (adm5120_cfe_parts[4].offset % mtd->erasesize);
 379                         }
 380                         adm5120_cfe_parts[4].size = size - adm5120_cfe_parts[3].size -
 381                                 adm5120_cfe_parts[4].offset;
 382                 }
 383         }
 384
 385         return adm5120_cfe_parts;
 386 }
 387 #endif
 388
 389 int __init init_adm5120_map(void)
 390 {
 391         size_t size;
 392         int ret = 0;
 393 #if defined (CONFIG_MTD_PARTITIONS) || (CONFIG_MTD_MYLOADER_PARTS)
 394         struct mtd_partition *parts;
 395         int i, parsed_nr_parts = 0;
 396 #endif
 397         printk("adm5120 : flash init : 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
 398         adm5120_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
 399
 400         if (!adm5120_map.virt) {
 401                 printk("Failed to ioremap\n");
 402                 return -EIO;
 403         }
 404         simple_map_init(&adm5120_map);
 405
 406         if (!(adm5120_mtd = do_map_probe("cfi_probe", &adm5120_map))) {
 407                 printk("Failed to do_map_probe\n");
 408                 iounmap((void *)adm5120_map.virt);
 409                 return -ENXIO;
 410         }
 411
 412         adm5120_mtd->owner = THIS_MODULE;
 413
 414         size = adm5120_mtd->size;
 415
 416         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
 417
 418 #ifdef CONFIG_MTD_PARTITIONS
 419
 420         if (adm5120_info.boot_loader == BOOT_LOADER_CFE)
 421         {
 422                 printk(KERN_NOTICE "adm5120 : using CFE flash mapping\n");
 423                 parts = init_mtd_partitions(adm5120_mtd, size);
 424
 425                 for (i = 0; parts[i].name; i++);
 426                         ret = add_mtd_partitions(adm5120_mtd, parts, i);
 427
 428                 if (ret) {
 429                         printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 430                         goto fail;
 431                 }
 432         }
 433 #endif
 434 #ifdef CONFIG_MTD_MYLOADER_PARTS
 435         if (adm5120_info.boot_loader == BOOT_LOADER_MYLOADER)
 436         {
 437                 printk(KERN_NOTICE "adm5120 : using MyLoader flash mapping\n");
 438                 char *part_type;
 439
 440                 if (parsed_nr_parts == 0) {
 441                         ret = parse_myloader_partitions(adm5120_mtd, &parts, 0);
 442
 443                         if (ret  > 0) {
 444                                 part_type ="MyLoader";
 445                                 parsed_nr_parts = ret;
 446                         }
 447                 }
 448                 ret = add_mtd_partitions(adm5120_mtd, parts, parsed_nr_parts);
 449
 450                 if (ret) {
 451                         printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 452                         goto fail;
 453                 }
 454         }
 455 #endif
 456         return 0;
 457
 458  fail:
 459         if (adm5120_mtd)
 460                 map_destroy(adm5120_mtd);
 461         if (adm5120_map.virt)
 462                 iounmap((void *)adm5120_map.virt);
 463         adm5120_map.virt = 0;
 464         return ret;
 465 }
 466
 467 void __exit cleanup_adm5120_map(void)
 468 {
 469 #ifdef CONFIG_MTD_PARTITIONS
 470         del_mtd_partitions(adm5120_mtd);
 471 #endif
 472         map_destroy(adm5120_mtd);
 473         iounmap((void *)adm5120_map.virt);
 474 }
 475
 476 module_init(init_adm5120_map);
 477 module_exit(cleanup_adm5120_map);