openwrt/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 /* trx header */
  46 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  47 #define TRX_VERSION     1
  48 #define TRX_MAX_LEN     0x3A0000
  49 #define TRX_NO_HEADER   1               /* Do not write TRX header */
  50
  51 #define MAX_ARGS 8
  52
  53 struct trx_header {
  54         uint32_t magic;                 /* "HDR0" */
  55         uint32_t len;                   /* Length of file including header */
  56         uint32_t crc32;                 /* 32-bit CRC from flag_version to end of file */
  57         uint32_t flag_version;  /* 0:15 flags, 16:31 version */
  58         uint32_t offsets[3];    /* Offsets of partitions from start of header */
  59 };
  60
  61 #define BUFSIZE (10 * 1024)
  62
  63
  64 int
  65 mtd_unlock(const char *mtd)
  66 {
  67         int fd;
  68         struct mtd_info_user mtdInfo;
  69         struct erase_info_user mtdLockInfo;
  70
  71         fd = mtd_open(mtd, O_RDWR);
  72         if(fd < 0) {
  73                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
  74                 exit(1);
  75         }
  76
  77         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
  78                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
  79                 close(fd);
  80                 exit(1);
  81         }
  82
  83         printf("Unlocking %s ...\n", mtd);
  84         mtdLockInfo.start = 0;
  85         mtdLockInfo.length = mtdInfo.size;
  86         if(ioctl(fd, MEMUNLOCK, &mtdLockInfo)) {
  87                 fprintf(stderr, "Could not unlock MTD device: %s\n", mtd);
  88                 close(fd);
  89                 return 0;
  90         }
  91
  92         close(fd);
  93         return 0;
  94 }
  95
  96 int
  97 mtd_open(const char *mtd, int flags)
  98 {
  99         FILE *fp;
 100         char dev[PATH_MAX];
 101         int i;
 102
 103         if ((fp = fopen("/proc/mtd", "r"))) {
 104                 while (fgets(dev, sizeof(dev), fp)) {
 105                         if (sscanf(dev, "mtd%d:", &i) && strstr(dev, mtd)) {
 106                                 snprintf(dev, sizeof(dev), "/dev/mtd/%d", i);
 107                                 fclose(fp);
 108                                 return open(dev, flags);
 109                         }
 110                 }
 111                 fclose(fp);
 112         }
 113
 114         return open(mtd, flags);
 115 }
 116
 117 int
 118 mtd_erase(const char *mtd)
 119 {
 120         int fd;
 121         struct mtd_info_user mtdInfo;
 122         struct erase_info_user mtdEraseInfo;
 123
 124         fd = mtd_open(mtd, O_RDWR);
 125         if(fd < 0) {
 126                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 127                 exit(1);
 128         }
 129
 130         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 131                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 132                 close(fd);
 133                 exit(1);
 134         }
 135
 136         printf("Erasing %s ...\n", mtd);
 137         mtdEraseInfo.length = mtdInfo.erasesize;
 138
 139         for (mtdEraseInfo.start = 0;
 140                  mtdEraseInfo.start < mtdInfo.size;
 141                  mtdEraseInfo.start += mtdInfo.erasesize) {
 142
 143                 ioctl(fd, MEMUNLOCK, &mtdEraseInfo);
 144                 if(ioctl(fd, MEMERASE, &mtdEraseInfo)) {
 145                         fprintf(stderr, "Could not erase MTD device: %s\n", mtd);
 146                         close(fd);
 147                         exit(1);
 148                 }
 149         }
 150
 151         close(fd);
 152         return 0;
 153
 154 }
 155
 156 int
 157 mtd_write(const char *trxfile, const char *mtd)
 158 {
 159         int fd;
 160         int trxfd;
 161         int i;
 162         size_t result,size,written;
 163         struct mtd_info_user mtdInfo;
 164         struct erase_info_user mtdEraseInfo;
 165         struct stat trxstat;
 166         unsigned char src[BUFSIZE],dest[BUFSIZE];
 167
 168         fd = mtd_open(mtd, O_RDWR);
 169         if(fd < 0) {
 170                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 171                 exit(1);
 172         }
 173
 174         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 175                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 176                 close(fd);
 177                 exit(1);
 178         }
 179
 180         trxfd = open(trxfile,O_RDONLY);
 181         if(trxfd < 0) {
 182                 fprintf(stderr, "Could not open trx image: %s\n", trxfile);
 183                 exit(1);
 184         }
 185
 186         if (fstat (trxfd,&trxstat) < 0) {
 187                 fprintf(stderr, "Could not get trx image file status: %s\n", trxfile);
 188                 close(trxfd);
 189                 exit(1);
 190         }
 191
 192         if(mtdInfo.size < trxstat.st_size) {
 193                 fprintf(stderr, "Image too big for partition: %s\n", mtd);
 194                 close(trxfd);
 195                 exit(1);
 196         }
 197
 198         printf("Writing %s to %s ...\n", trxfile, mtd);
 199
 200         mtdEraseInfo.start = 0;
 201         mtdEraseInfo.length = trxstat.st_size & ~(mtdInfo.erasesize -1);
 202         if(trxstat.st_size % mtdInfo.erasesize) mtdEraseInfo.length += mtdInfo.erasesize;
 203
 204         /* erase the chunk */
 205         if (ioctl (fd,MEMERASE,&mtdEraseInfo) < 0) {
 206                 fprintf(stderr, "Erasing mtd failed: %s\n", mtd);
 207                 exit(1);
 208         }
 209
 210         size = trxstat.st_size;
 211         i = BUFSIZE;
 212         written = 0;
 213
 214         while (size) {
 215                 if (size < BUFSIZE) i = size;
 216                 read(trxfd,src,i);
 217                 result = write(fd,src,i);
 218                 if (i != result) {
 219                         if (result < 0) {
 220                                 fprintf(stderr,"Error while writing image");
 221                                 exit(1);
 222                         }
 223                         fprintf(stderr,"Error writing image");
 224                         exit(1);
 225                 }
 226                 written += i;
 227                 size -= i;
 228         }
 229
 230         return 0;
 231 }
 232
 233 void usage(void)
 234 {
 235         printf("Usage: mtd [<options> ...] <command> [<arguments> ...] <device>\n\n"
 236         "The device is in the format of mtdX (eg: mtd4) or its label.\n"
 237         "mtd recognizes these commands:\n"
 238         "       unlock                  unlock the device\n"
 239         "       erase                   erase all data on device\n"
 240         "       write <imagefile>       write imagefile to device\n"
 241         "Following options are available:\n"
 242         "       -r                      reboot after successful command\n"
 243         "       -e <device>             erase <device> before executing the command\n\n"
 244         "Example: To write linux.trx to mtd4 labeled as linux and reboot afterwards\n"
 245         "         mtd -r write linux.trx linux\n\n");
 246         exit(1);
 247 }
 248
 249 int main (int argc, char **argv)
 250 {
 251         int ch, i, boot, unlock;
 252         char *erase[MAX_ARGS], *device;
 253         enum {
 254                 CMD_ERASE,
 255                 CMD_WRITE,
 256                 CMD_UNLOCK
 257         } cmd;
 258
 259         erase[0] = NULL;
 260         boot = 0;
 261
 262         while ((ch = getopt(argc, argv, "re:")) != -1)
 263                 switch (ch) {
 264                         case 'r':
 265                                 boot = 1;
 266                                 break;
 267                         case 'e':
 268                                 i = 0;
 269                                 while ((erase[i] != NULL) && ((i + 1) < MAX_ARGS))
 270                                         i++;
 271
 272                                 erase[i++] = optarg;
 273                                 erase[i] = NULL;
 274                                 break;
 275
 276                         case '?':
 277                         default:
 278                                 usage();
 279                 }
 280         argc -= optind;
 281         argv += optind;
 282
 283         if (argc < 2)
 284                 usage();
 285
 286         if ((strcmp(argv[0], "unlock") == 0) && (argc == 2)) {
 287                 cmd = CMD_UNLOCK;
 288                 device = argv[1];
 289         } else if ((strcmp(argv[0], "erase") == 0) && (argc == 2)) {
 290                 cmd = CMD_ERASE;
 291                 device = argv[1];
 292         } else if ((strcmp(argv[0], "write") == 0) && (argc == 3)) {
 293                 cmd = CMD_WRITE;
 294                 device = argv[2];
 295         } else {
 296                 usage();
 297         }
 298
 299         sync();
 300
 301         i = 0;
 302         while (erase[i] != NULL) {
 303                 mtd_unlock(erase[i]);
 304                 mtd_erase(erase[i]);
 305                 i++;
 306         }
 307
 308         mtd_unlock(device);
 309
 310         switch (cmd) {
 311                 case CMD_UNLOCK:
 312                         break;
 313                 case CMD_ERASE:
 314                         mtd_erase(device);
 315                         break;
 316                 case CMD_WRITE:
 317                         mtd_write(argv[1], device);
 318                         break;
 319         }
 320
 321         if (boot)
 322                 kill(1, 15); // send SIGTERM to init for reboot
 323
 324         return 0;
 325 }