openwrt/package/mtd/mtd.c

   1 /*
   2  * mtd - simple memory technology device manipulation tool
   3  *
   4  * Copyright (C) 2005 Waldemar Brodkorb <wbx@dass-it.de>,
   5  *                    Felix Fietkau <nbd@vd-s.ath.cx>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20  *
  21  * $Id$
  22  *
  23  * code is based on linux-mtd example code
  24  */
  25
  26 #include <limits.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #include <stdint.h>
  31 #include <fcntl.h>
  32 #include <errno.h>
  33 #include <error.h>
  34 #include <time.h>
  35 #include <sys/ioctl.h>
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include <sys/mount.h>
  39 #include <sys/stat.h>
  40 #include <sys/reboot.h>
  41 #include <string.h>
  42
  43 #include <linux/mtd/mtd.h>
  44
  45 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  46 #define BUFSIZE (10 * 1024)
  47 #define MAX_ARGS 8
  48
  49 struct trx_header {
  50         uint32_t magic;         /* "HDR0" */
  51         uint32_t len;           /* Length of file including header */
  52         uint32_t crc32;         /* 32-bit CRC from flag_version to end of file */
  53         uint32_t flag_version;  /* 0:15 flags, 16:31 version */
  54         uint32_t offsets[3];    /* Offsets of partitions from start of header */
  55 };
  56
  57 int
  58 trx_check(const char *trxfile, const char *mtd)
  59 {
  60         struct mtd_info_user mtdInfo;
  61         int trxfd, fd;
  62         size_t count;
  63         struct trx_header trx;
  64         struct stat trxstat;
  65
  66         trxfd = open(trxfile,O_RDONLY);
  67         if(trxfd < 0) {
  68                 fprintf(stderr, "Could not open trx image: %s\n", trxfile);
  69                 exit(1);
  70         }
  71
  72         if (fstat(trxfd,&trxstat) < 0) {
  73                 fprintf(stderr, "Could not get trx image file status: %s\n", trxfile);
  74                 close(trxfd);
  75                 exit(1);
  76         }
  77
  78         count = read(trxfd, &trx, sizeof(struct trx_header));
  79         if (count < sizeof(struct trx_header)) {
  80                 fprintf(stderr, "Could not trx header, file too small (%ld bytes)\n", count);
  81                 close(trxfd);
  82                 exit(1);
  83         }
  84
  85         if (trx.magic != TRX_MAGIC || trx.len < sizeof(struct trx_header)) {
  86                 fprintf(stderr, "Bad trx header\n");
  87                 fprintf(stderr, "If this is a firmware in bin format, like some of the\n"
  88                                 "original firmware files are, use following command to convert to trx:\n"
  89                                 "dd if=firmware.bin of=firmware.trx bs=32 skip=1\n");
  90                 close(trxfd);
  91                 exit(1);
  92         }
  93
  94         lseek(trxfd, 0, SEEK_SET);
  95
  96         /* check if image fits to mtd device */
  97
  98         fd = mtd_open(mtd, O_RDWR);
  99         if(fd < 0) {
 100                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 101                 exit(1);
 102         }
 103
 104         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 105                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 106                 close(fd);
 107                 exit(1);
 108         }
 109
 110         if(mtdInfo.size < trxstat.st_size) {
 111                 fprintf(stderr, "Image too big for partition: %s\n", mtd);
 112                 close(trxfd);
 113                 close(fd);
 114                 exit(1);
 115         }
 116
 117         printf("Writing %s to %s ...\n", trxfile, mtd);
 118
 119         close(fd);
 120
 121         return(trxfd);
 122 }
 123
 124 int
 125 mtd_unlock(const char *mtd)
 126 {
 127         int fd;
 128         struct mtd_info_user mtdInfo;
 129         struct erase_info_user mtdLockInfo;
 130
 131         fd = mtd_open(mtd, O_RDWR);
 132         if(fd < 0) {
 133                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 134                 exit(1);
 135         }
 136
 137         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 138                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 139                 close(fd);
 140                 exit(1);
 141         }
 142
 143         printf("Unlocking %s ...\n", mtd);
 144         mtdLockInfo.start = 0;
 145         mtdLockInfo.length = mtdInfo.size;
 146         if(ioctl(fd, MEMUNLOCK, &mtdLockInfo)) {
 147                 close(fd);
 148                 return 0;
 149         }
 150
 151         close(fd);
 152         return 0;
 153 }
 154
 155 int
 156 mtd_open(const char *mtd, int flags)
 157 {
 158         FILE *fp;
 159         char dev[PATH_MAX];
 160         int i;
 161
 162         if ((fp = fopen("/proc/mtd", "r"))) {
 163                 while (fgets(dev, sizeof(dev), fp)) {
 164                         if (sscanf(dev, "mtd%d:", &i) && strstr(dev, mtd)) {
 165                                 snprintf(dev, sizeof(dev), "/dev/mtd/%d", i);
 166                                 fclose(fp);
 167                                 return open(dev, flags);
 168                         }
 169                 }
 170                 fclose(fp);
 171         }
 172
 173         return open(mtd, flags);
 174 }
 175
 176 int
 177 mtd_erase(const char *mtd)
 178 {
 179         int fd;
 180         struct mtd_info_user mtdInfo;
 181         struct erase_info_user mtdEraseInfo;
 182
 183         fd = mtd_open(mtd, O_RDWR);
 184         if(fd < 0) {
 185                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 186                 exit(1);
 187         }
 188
 189         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 190                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 191                 close(fd);
 192                 exit(1);
 193         }
 194
 195         printf("Erasing %s ...\n", mtd);
 196         mtdEraseInfo.length = mtdInfo.erasesize;
 197
 198         for (mtdEraseInfo.start = 0;
 199                  mtdEraseInfo.start < mtdInfo.size;
 200                  mtdEraseInfo.start += mtdInfo.erasesize) {
 201
 202                 ioctl(fd, MEMUNLOCK, &mtdEraseInfo);
 203                 if(ioctl(fd, MEMERASE, &mtdEraseInfo)) {
 204                         fprintf(stderr, "Could not erase MTD device: %s\n", mtd);
 205                         close(fd);
 206                         exit(1);
 207                 }
 208         }
 209
 210         close(fd);
 211         return 0;
 212
 213 }
 214
 215 int
 216 mtd_write(int trxfd, const char *mtd)
 217 {
 218         int fd,i;
 219         size_t result,size,written;
 220         struct mtd_info_user mtdInfo;
 221         struct erase_info_user mtdEraseInfo;
 222         unsigned char src[BUFSIZE],dest[BUFSIZE];
 223         struct stat trxstat;
 224
 225         if (fstat(trxfd,&trxstat) < 0) {
 226                 fprintf(stderr, "Could not get trx image file status\n");
 227                 close(trxfd);
 228                 exit(1);
 229         }
 230
 231         fd = mtd_open(mtd, O_RDWR);
 232         if(fd < 0) {
 233                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 234                 exit(1);
 235         }
 236
 237         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 238                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 239                 close(fd);
 240                 exit(1);
 241         }
 242
 243         mtdEraseInfo.start = 0;
 244         mtdEraseInfo.length = trxstat.st_size & ~(mtdInfo.erasesize -1);
 245         if(trxstat.st_size % mtdInfo.erasesize) mtdEraseInfo.length += mtdInfo.erasesize;
 246
 247         /* erase the chunk */
 248         if (ioctl (fd,MEMERASE,&mtdEraseInfo) < 0) {
 249                 fprintf(stderr, "Erasing mtd failed: %s\n", mtd);
 250                 exit(1);
 251         }
 252
 253         size = trxstat.st_size;
 254         i = BUFSIZE;
 255         written = 0;
 256
 257         while (size) {
 258                 if (size < BUFSIZE) i = size;
 259                 read(trxfd,src,i);
 260                 result = write(fd,src,i);
 261                 if (i != result) {
 262                         if (result < 0) {
 263                                 fprintf(stderr,"Error while writing image");
 264                                 exit(1);
 265                         }
 266                         fprintf(stderr,"Error writing image");
 267                         exit(1);
 268                 }
 269                 written += i;
 270                 size -= i;
 271         }
 272
 273         return 0;
 274 }
 275
 276 void usage(void)
 277 {
 278         printf("Usage: mtd [<options> ...] <command> [<arguments> ...] <device>\n\n"
 279         "The device is in the format of mtdX (eg: mtd4) or its label.\n"
 280         "mtd recognizes these commands:\n"
 281         "       unlock                  unlock the device\n"
 282         "       erase                   erase all data on device\n"
 283         "       write <imagefile>       write imagefile to device\n"
 284         "Following options are available:\n"
 285         "       -r                      reboot after successful command\n"
 286         "       -e <device>             erase <device> before executing the command\n\n"
 287         "Example: To write linux.trx to mtd4 labeled as linux and reboot afterwards\n"
 288         "         mtd -r write linux.trx linux\n\n");
 289         exit(1);
 290 }
 291
 292 int main (int argc, char **argv)
 293 {
 294         int ch, i, boot, unlock, trxfd;
 295         char *erase[MAX_ARGS], *device;
 296         enum {
 297                 CMD_ERASE,
 298                 CMD_WRITE,
 299                 CMD_UNLOCK
 300         } cmd;
 301
 302         erase[0] = NULL;
 303         boot = 0;
 304
 305         while ((ch = getopt(argc, argv, "re:")) != -1)
 306                 switch (ch) {
 307                         case 'r':
 308                                 boot = 1;
 309                                 break;
 310                         case 'e':
 311                                 i = 0;
 312                                 while ((erase[i] != NULL) && ((i + 1) < MAX_ARGS))
 313                                         i++;
 314
 315                                 erase[i++] = optarg;
 316                                 erase[i] = NULL;
 317                                 break;
 318
 319                         case '?':
 320                         default:
 321                                 usage();
 322                 }
 323         argc -= optind;
 324         argv += optind;
 325
 326         if (argc < 2)
 327                 usage();
 328
 329         if ((strcmp(argv[0], "unlock") == 0) && (argc == 2)) {
 330                 cmd = CMD_UNLOCK;
 331                 device = argv[1];
 332         } else if ((strcmp(argv[0], "erase") == 0) && (argc == 2)) {
 333                 cmd = CMD_ERASE;
 334                 device = argv[1];
 335         } else if ((strcmp(argv[0], "write") == 0) && (argc == 3)) {
 336                 cmd = CMD_WRITE;
 337                 device = argv[2];
 338                 /* check trx file before erasing or writing anything */
 339                 trxfd = trx_check(argv[1], device);
 340         } else {
 341                 usage();
 342         }
 343
 344         sync();
 345
 346         i = 0;
 347         while (erase[i] != NULL) {
 348                 mtd_unlock(erase[i]);
 349                 mtd_erase(erase[i]);
 350                 i++;
 351         }
 352
 353         mtd_unlock(device);
 354
 355         switch (cmd) {
 356                 case CMD_UNLOCK:
 357                         break;
 358                 case CMD_ERASE:
 359                         mtd_erase(device);
 360                         break;
 361                 case CMD_WRITE:
 362                         mtd_write(trxfd, device);
 363                         break;
 364         }
 365
 366         if (boot)
 367                 kill(1, 15); // send SIGTERM to init for reboot
 368
 369         return 0;
 370 }