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  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19  *
  20  * mtd utility for the openwrt project
  21  * it is mainly code from the linux-mtd project, which accepts the same
  22  * command line arguments as the broadcom utility
  23  *
  24  * $Id$
  25  *
  26  */
  27
  28 #include <limits.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <stdint.h>
  33 #include <fcntl.h>
  34 #include <errno.h>
  35 #include <error.h>
  36 #include <time.h>
  37 #include <sys/ioctl.h>
  38 #include <sys/types.h>
  39 #include <sys/param.h>
  40 #include <sys/mount.h>
  41 #include <sys/stat.h>
  42 #include <string.h>
  43
  44 #include <linux/mtd/mtd.h>
  45
  46 /* trx header */
  47 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  48 #define TRX_VERSION     1
  49 #define TRX_MAX_LEN     0x3A0000
  50 #define TRX_NO_HEADER   1               /* Do not write TRX header */
  51
  52 struct trx_header {
  53         uint32_t magic;                 /* "HDR0" */
  54         uint32_t len;                   /* Length of file including header */
  55         uint32_t crc32;                 /* 32-bit CRC from flag_version to end of file */
  56         uint32_t flag_version;  /* 0:15 flags, 16:31 version */
  57         uint32_t offsets[3];    /* Offsets of partitions from start of header */
  58 };
  59
  60 #define BUFSIZE (10 * 1024)
  61
  62 extern int mtd_open(const char *mtd, int flags);
  63 extern int mtd_erase(const char *mtd);
  64 extern int mtd_write(const char *trxfile, const char *mtd);
  65
  66 int
  67 mtd_unlock(const char *mtd)
  68 {
  69         int fd;
  70         struct mtd_info_user mtdInfo;
  71         struct erase_info_user mtdLockInfo;
  72
  73         fd = mtd_open(mtd, O_RDWR);
  74         if(fd < 0) {
  75                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
  76                 exit(1);
  77         }
  78
  79         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
  80                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
  81                 close(fd);
  82                 exit(1);
  83         }
  84
  85         mtdLockInfo.start = 0;
  86         mtdLockInfo.length = mtdInfo.size;
  87         if(ioctl(fd, MEMUNLOCK, &mtdLockInfo)) {
  88                 fprintf(stderr, "Could not unlock MTD device: %s\n", mtd);
  89                 close(fd);
  90                 exit(1);
  91         }
  92
  93         close(fd);
  94         return 0;
  95 }
  96
  97 int
  98 mtd_open(const char *mtd, int flags)
  99 {
 100         FILE *fp;
 101         char dev[PATH_MAX];
 102         int i;
 103
 104         if ((fp = fopen("/proc/mtd", "r"))) {
 105                 while (fgets(dev, sizeof(dev), fp)) {
 106                         if (sscanf(dev, "mtd%d:", &i) && strstr(dev, mtd)) {
 107                                 snprintf(dev, sizeof(dev), "/dev/mtd/%d", i);
 108                                 fclose(fp);
 109                                 return open(dev, flags);
 110                         }
 111                 }
 112                 fclose(fp);
 113         }
 114
 115         return open(mtd, flags);
 116 }
 117
 118 int
 119 mtd_erase(const char *mtd)
 120 {
 121         int fd;
 122         struct mtd_info_user mtdInfo;
 123         struct erase_info_user mtdEraseInfo;
 124
 125         fd = mtd_open(mtd, O_RDWR);
 126         if(fd < 0) {
 127                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 128                 exit(1);
 129         }
 130
 131         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 132                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 133                 close(fd);
 134                 exit(1);
 135         }
 136
 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         mtdEraseInfo.start = 0;
 199         mtdEraseInfo.length = trxstat.st_size & ~(mtdInfo.erasesize -1);
 200         if(trxstat.st_size % mtdInfo.erasesize) mtdEraseInfo.length += mtdInfo.erasesize;
 201
 202         /* erase the chunk */
 203         if (ioctl (fd,MEMERASE,&mtdEraseInfo) < 0) {
 204                 fprintf(stderr, "Erasing mtd failed: %s\n", mtd);
 205                 exit(1);
 206         }
 207
 208         size = trxstat.st_size;
 209         i = BUFSIZE;
 210         written = 0;
 211
 212         while (size) {
 213                 if (size < BUFSIZE) i = size;
 214                 read(trxfd,src,i);
 215                 result = write(fd,src,i);
 216                 if (i != result) {
 217                         if (result < 0) {
 218                                 fprintf(stderr,"Error while writing image");
 219                                 exit(1);
 220                         }
 221                         fprintf(stderr,"Error writing image");
 222                         exit(1);
 223                 }
 224                 written += i;
 225                 size -= i;
 226         }
 227
 228         return 0;
 229 }
 230
 231 int main(int argc, char **argv) {
 232         if(argc == 3 && strcasecmp(argv[1],"unlock")==0) {
 233                 printf("Unlocking %s ...\n",argv[2]);
 234                 return mtd_unlock(argv[2]);
 235         }
 236         if(argc == 3 && strcasecmp(argv[1],"erase")==0) {
 237                 printf("Erasing %s ...\n",argv[2]);
 238                 return mtd_erase(argv[2]);
 239         }
 240         if(argc == 4 && strcasecmp(argv[1],"write")==0) {
 241                 printf("Writing %s to %s ...\n",argv[2],argv[3]);
 242                 return mtd_write(argv[2],argv[3]);
 243         }
 244
 245         printf("no valid command given\n");
 246         printf("\nmtd: modify data within a Memory Technology Device.\n");
 247         printf("Copyright (C) 2005 Waldemar Brodkorb <wbx@dass-it.de>\n");
 248         printf("Documented by Mike Strates [dumpedcore] <mike@dilaudid.net>\n");
 249         printf("mtd has ABSOLUTELY NO WARRANTY and is licensed under the GNU GPL.\n");
 250         printf("\nUsage: mtd [unlock|erase] device\n");
 251         printf("       mtd write imagefile device\n");
 252         printf("\n .. where device is in the format of mtdX (eg: mtd4) or its label.\n");
 253         printf("\nunlock                enable modification to device\n");
 254         printf("erase           erase all data on device\n");
 255         printf("write           write imagefile to device\n");
 256         printf("\nExample: To write linux.trx to mtd4 labeled as linux\n");
 257         printf("\n                mtd unlock linux && mtd write linux.trx linux\n\n");
 258         return -1;
 259 }
 260