package/openwrt/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 mtd_unlock(const char *mtd)
  59 {
  60         int fd;
  61         struct mtd_info_user mtdInfo;
  62         struct erase_info_user mtdLockInfo;
  63
  64         fd = mtd_open(mtd, O_RDWR);
  65         if(fd < 0) {
  66                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
  67                 exit(1);
  68         }
  69
  70         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
  71                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
  72                 close(fd);
  73                 exit(1);
  74         }
  75
  76         printf("Unlocking %s ...\n", mtd);
  77         mtdLockInfo.start = 0;
  78         mtdLockInfo.length = mtdInfo.size;
  79         if(ioctl(fd, MEMUNLOCK, &mtdLockInfo)) {
  80                 close(fd);
  81                 return 0;
  82         }
  83
  84         close(fd);
  85         return 0;
  86 }
  87
  88 int
  89 mtd_open(const char *mtd, int flags)
  90 {
  91         FILE *fp;
  92         char dev[PATH_MAX];
  93         int i;
  94
  95         if ((fp = fopen("/proc/mtd", "r"))) {
  96                 while (fgets(dev, sizeof(dev), fp)) {
  97                         if (sscanf(dev, "mtd%d:", &i) && strstr(dev, mtd)) {
  98                                 snprintf(dev, sizeof(dev), "/dev/mtd/%d", i);
  99                                 fclose(fp);
 100                                 return open(dev, flags);
 101                         }
 102                 }
 103                 fclose(fp);
 104         }
 105
 106         return open(mtd, flags);
 107 }
 108
 109 int
 110 mtd_erase(const char *mtd)
 111 {
 112         int fd;
 113         struct mtd_info_user mtdInfo;
 114         struct erase_info_user mtdEraseInfo;
 115
 116         fd = mtd_open(mtd, O_RDWR);
 117         if(fd < 0) {
 118                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 119                 exit(1);
 120         }
 121
 122         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 123                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 124                 close(fd);
 125                 exit(1);
 126         }
 127
 128         printf("Erasing %s ...\n", mtd);
 129         mtdEraseInfo.length = mtdInfo.erasesize;
 130
 131         for (mtdEraseInfo.start = 0;
 132                  mtdEraseInfo.start < mtdInfo.size;
 133                  mtdEraseInfo.start += mtdInfo.erasesize) {
 134
 135                 ioctl(fd, MEMUNLOCK, &mtdEraseInfo);
 136                 if(ioctl(fd, MEMERASE, &mtdEraseInfo)) {
 137                         fprintf(stderr, "Could not erase MTD device: %s\n", mtd);
 138                         close(fd);
 139                         exit(1);
 140                 }
 141         }
 142
 143         close(fd);
 144         return 0;
 145
 146 }
 147
 148 int
 149 mtd_write(const char *trxfile, const char *mtd)
 150 {
 151         int fd,trxfd,i;
 152         struct trx_header trx;
 153         size_t count,result,size,written;
 154         struct mtd_info_user mtdInfo;
 155         struct erase_info_user mtdEraseInfo;
 156         struct stat trxstat;
 157         unsigned char src[BUFSIZE],dest[BUFSIZE];
 158
 159         trxfd = open(trxfile,O_RDONLY);
 160         if(trxfd < 0) {
 161                 fprintf(stderr, "Could not open trx image: %s\n", trxfile);
 162                 exit(1);
 163         }
 164
 165         if (fstat(trxfd,&trxstat) < 0) {
 166                 fprintf(stderr, "Could not get trx image file status: %s\n", trxfile);
 167                 close(trxfd);
 168                 exit(1);
 169         }
 170
 171         count = read(trxfd, &trx, sizeof(struct trx_header));
 172         if (count < sizeof(struct trx_header)) {
 173                 fprintf(stderr, "Could not trx header, file too small (%ld bytes)\n", count);
 174                 close(trxfd);
 175                 exit(1);
 176         }
 177
 178         if (trx.magic != TRX_MAGIC || trx.len < sizeof(struct trx_header)) {
 179                 fprintf(stderr, "Bad trx header\n");
 180                 fprintf(stderr, "If this is a firmware in bin format, like some of the\n"
 181                                 "original firmware files are, use following command to convert to trx:\n"
 182                                 "dd if=firmware.bin of=firmware.trx bs=32 skip=1\n");
 183                 close(trxfd);
 184                 exit(1);
 185         }
 186
 187         lseek(trxfd, 0, SEEK_SET);
 188
 189         fd = mtd_open(mtd, O_RDWR);
 190         if(fd < 0) {
 191                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 192                 exit(1);
 193         }
 194
 195         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 196                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 197                 close(fd);
 198                 exit(1);
 199         }
 200
 201         if(mtdInfo.size < trxstat.st_size) {
 202                 fprintf(stderr, "Image too big for partition: %s\n", mtd);
 203                 close(trxfd);
 204                 exit(1);
 205         }
 206
 207         printf("Writing %s to %s ...\n", trxfile, mtd);
 208
 209         mtdEraseInfo.start = 0;
 210         mtdEraseInfo.length = trxstat.st_size & ~(mtdInfo.erasesize -1);
 211         if(trxstat.st_size % mtdInfo.erasesize) mtdEraseInfo.length += mtdInfo.erasesize;
 212
 213         /* erase the chunk */
 214         if (ioctl (fd,MEMERASE,&mtdEraseInfo) < 0) {
 215                 fprintf(stderr, "Erasing mtd failed: %s\n", mtd);
 216                 exit(1);
 217         }
 218
 219         size = trxstat.st_size;
 220         i = BUFSIZE;
 221         written = 0;
 222
 223         while (size) {
 224                 if (size < BUFSIZE) i = size;
 225                 read(trxfd,src,i);
 226                 result = write(fd,src,i);
 227                 if (i != result) {
 228                         if (result < 0) {
 229                                 fprintf(stderr,"Error while writing image");
 230                                 exit(1);
 231                         }
 232                         fprintf(stderr,"Error writing image");
 233                         exit(1);
 234                 }
 235                 written += i;
 236                 size -= i;
 237         }
 238
 239         return 0;
 240 }
 241
 242 void usage(void)
 243 {
 244         printf("Usage: mtd [<options> ...] <command> [<arguments> ...] <device>\n\n"
 245         "The device is in the format of mtdX (eg: mtd4) or its label.\n"
 246         "mtd recognizes these commands:\n"
 247         "       unlock                  unlock the device\n"
 248         "       erase                   erase all data on device\n"
 249         "       write <imagefile>       write imagefile to device\n"
 250         "Following options are available:\n"
 251         "       -r                      reboot after successful command\n"
 252         "       -e <device>             erase <device> before executing the command\n\n"
 253         "Example: To write linux.trx to mtd4 labeled as linux and reboot afterwards\n"
 254         "         mtd -r write linux.trx linux\n\n");
 255         exit(1);
 256 }
 257
 258 int main (int argc, char **argv)
 259 {
 260         int ch, i, boot, unlock;
 261         char *erase[MAX_ARGS], *device;
 262         enum {
 263                 CMD_ERASE,
 264                 CMD_WRITE,
 265                 CMD_UNLOCK
 266         } cmd;
 267
 268         erase[0] = NULL;
 269         boot = 0;
 270
 271         while ((ch = getopt(argc, argv, "re:")) != -1)
 272                 switch (ch) {
 273                         case 'r':
 274                                 boot = 1;
 275                                 break;
 276                         case 'e':
 277                                 i = 0;
 278                                 while ((erase[i] != NULL) && ((i + 1) < MAX_ARGS))
 279                                         i++;
 280
 281                                 erase[i++] = optarg;
 282                                 erase[i] = NULL;
 283                                 break;
 284
 285                         case '?':
 286                         default:
 287                                 usage();
 288                 }
 289         argc -= optind;
 290         argv += optind;
 291
 292         if (argc < 2)
 293                 usage();
 294
 295         if ((strcmp(argv[0], "unlock") == 0) && (argc == 2)) {
 296                 cmd = CMD_UNLOCK;
 297                 device = argv[1];
 298         } else if ((strcmp(argv[0], "erase") == 0) && (argc == 2)) {
 299                 cmd = CMD_ERASE;
 300                 device = argv[1];
 301         } else if ((strcmp(argv[0], "write") == 0) && (argc == 3)) {
 302                 cmd = CMD_WRITE;
 303                 device = argv[2];
 304         } else {
 305                 usage();
 306         }
 307
 308         sync();
 309
 310         i = 0;
 311         while (erase[i] != NULL) {
 312                 mtd_unlock(erase[i]);
 313                 mtd_erase(erase[i]);
 314                 i++;
 315         }
 316
 317         mtd_unlock(device);
 318
 319         switch (cmd) {
 320                 case CMD_UNLOCK:
 321                         break;
 322                 case CMD_ERASE:
 323                         mtd_erase(device);
 324                         break;
 325                 case CMD_WRITE:
 326                         mtd_write(argv[1], device);
 327                         break;
 328         }
 329
 330         if (boot)
 331                 kill(1, 15); // send SIGTERM to init for reboot
 332
 333         return 0;
 334 }