release/src/router/busybox/miscutils/nandwrite.c

   1 /*
   2  * nandwrite and nanddump ported to busybox from mtd-utils
   3  *
   4  * Author: Baruch Siach <baruch@tkos.co.il>, Orex Computed Radiography
   5  *
   6  * Licensed under GPLv2, see file LICENSE in this source tree.
   7  *
   8  * TODO: add support for large (>4GB) MTD devices
   9  */
  10
  11 //config:config NANDWRITE
  12 //config:       bool "nandwrite"
  13 //config:       default y
  14 //config:       select PLATFORM_LINUX
  15 //config:       help
  16 //config:         Write to the specified MTD device, with bad blocks awareness
  17 //config:
  18 //config:config NANDDUMP
  19 //config:       bool "nanddump"
  20 //config:       default y
  21 //config:       select PLATFORM_LINUX
  22 //config:       help
  23 //config:         Dump the content of raw NAND chip
  24
  25 //applet:IF_NANDWRITE(APPLET(nandwrite, BB_DIR_USR_SBIN, BB_SUID_DROP))
  26 //applet:IF_NANDDUMP(APPLET_ODDNAME(nanddump, nandwrite, BB_DIR_USR_SBIN, BB_SUID_DROP, nanddump))
  27
  28 //kbuild:lib-$(CONFIG_NANDWRITE) += nandwrite.o
  29 //kbuild:lib-$(CONFIG_NANDDUMP) += nandwrite.o
  30
  31 //usage:#define nandwrite_trivial_usage
  32 //usage:        "[-p] [-s ADDR] MTD_DEVICE [FILE]"
  33 //usage:#define nandwrite_full_usage "\n\n"
  34 //usage:        "Write to MTD_DEVICE\n"
  35 //usage:     "\n        -p      Pad to page size"
  36 //usage:     "\n        -s ADDR Start address"
  37
  38 //usage:#define nanddump_trivial_usage
  39 //usage:        "[-o]" IF_LONG_OPTS(" [--bb=padbad|skipbad]") " [-s ADDR] [-l LEN] [-f FILE] MTD_DEVICE"
  40 //usage:#define nanddump_full_usage "\n\n"
  41 //usage:        "Dump MTD_DEVICE\n"
  42 //usage:     "\n        -o      Dump oob data"
  43 //usage:     "\n        -s ADDR Start address"
  44 //usage:     "\n        -l LEN  Length"
  45 //usage:     "\n        -f FILE Dump to file ('-' for stdout)"
  46 //usage:     IF_LONG_OPTS(
  47 //usage:     "\n        --bb=METHOD:"
  48 //usage:     "\n                skipbad: skip bad blocks"
  49 //usage:     "\n                padbad: substitute bad blocks by 0xff (default)"
  50 //usage:     )
  51
  52 #include "libbb.h"
  53 #include <mtd/mtd-user.h>
  54
  55 #define IS_NANDDUMP  (ENABLE_NANDDUMP && (!ENABLE_NANDWRITE || (applet_name[4] == 'd')))
  56 #define IS_NANDWRITE (ENABLE_NANDWRITE && (!ENABLE_NANDDUMP || (applet_name[4] != 'd')))
  57
  58 #define OPT_p  (1 << 0) /* nandwrite only */
  59 #define OPT_o  (1 << 0) /* nanddump only */
  60 #define OPT_s  (1 << 1)
  61 #define OPT_f  (1 << 2)
  62 #define OPT_l  (1 << 3)
  63 #define OPT_bb (1 << 4) /* must be the last one in the list */
  64
  65 #define BB_PADBAD (1 << 0)
  66 #define BB_SKIPBAD (1 << 1)
  67
  68 /* helper for writing out 0xff for bad blocks pad */
  69 static void dump_bad(struct mtd_info_user *meminfo, unsigned len, int oob)
  70 {
  71         unsigned char buf[meminfo->writesize];
  72         unsigned count;
  73
  74         /* round len to the next page only if len is not already on a page */
  75         len = ((len - 1) | (meminfo->writesize - 1)) + 1;
  76
  77         memset(buf, 0xff, sizeof(buf));
  78         for (count = 0; count < len; count += meminfo->writesize) {
  79                 xwrite(STDOUT_FILENO, buf, meminfo->writesize);
  80                 if (oob)
  81                         xwrite(STDOUT_FILENO, buf, meminfo->oobsize);
  82         }
  83 }
  84
  85 static unsigned next_good_eraseblock(int fd, struct mtd_info_user *meminfo,
  86                 unsigned block_offset)
  87 {
  88         while (1) {
  89                 loff_t offs;
  90
  91                 if (block_offset >= meminfo->size) {
  92                         if (IS_NANDWRITE)
  93                                 bb_error_msg_and_die("not enough space in MTD device");
  94                         return block_offset; /* let the caller exit */
  95                 }
  96                 offs = block_offset;
  97                 if (xioctl(fd, MEMGETBADBLOCK, &offs) == 0)
  98                         return block_offset;
  99                 /* ioctl returned 1 => "bad block" */
 100                 if (IS_NANDWRITE)
 101                         printf("Skipping bad block at 0x%08x\n", block_offset);
 102                 block_offset += meminfo->erasesize;
 103         }
 104 }
 105
 106 int nandwrite_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 107 int nandwrite_main(int argc UNUSED_PARAM, char **argv)
 108 {
 109         /* Buffer for OOB data */
 110         unsigned char *oobbuf;
 111         unsigned opts;
 112         unsigned bb_method = BB_SKIPBAD;
 113         int fd;
 114         ssize_t cnt;
 115         unsigned mtdoffset, meminfo_writesize, blockstart, limit;
 116         unsigned end_addr = ~0;
 117         struct mtd_info_user meminfo;
 118         struct mtd_oob_buf oob;
 119         unsigned char *filebuf;
 120         const char *opt_s = "0", *opt_f = "-", *opt_l, *opt_bb;
 121
 122         if (IS_NANDDUMP) {
 123                 opt_complementary = "=1";
 124 #if ENABLE_LONG_OPTS
 125                 applet_long_options =
 126                         "bb\0" Required_argument "\xff"; /* no short equivalent */
 127 #endif
 128                 opts = getopt32(argv, "os:f:l:", &opt_s, &opt_f, &opt_l, &opt_bb);
 129         } else { /* nandwrite */
 130                 opt_complementary = "-1:?2";
 131                 opts = getopt32(argv, "ps:", &opt_s);
 132         }
 133         argv += optind;
 134
 135         if (IS_NANDWRITE && argv[1])
 136                 opt_f = argv[1];
 137         if (!LONE_DASH(opt_f)) {
 138                 int tmp_fd = xopen(opt_f,
 139                         IS_NANDDUMP ? O_WRONLY | O_TRUNC | O_CREAT : O_RDONLY
 140                 );
 141                 xmove_fd(tmp_fd, IS_NANDDUMP ? STDOUT_FILENO : STDIN_FILENO);
 142         }
 143
 144         fd = xopen(argv[0], IS_NANDWRITE ? O_RDWR : O_RDONLY);
 145         xioctl(fd, MEMGETINFO, &meminfo);
 146
 147         mtdoffset = xstrtou(opt_s, 0);
 148         if (IS_NANDDUMP && (opts & OPT_l)) {
 149                 unsigned length = xstrtou(opt_l, 0);
 150                 if (length < meminfo.size - mtdoffset)
 151                         end_addr = mtdoffset + length;
 152         }
 153         if (IS_NANDDUMP && (opts & OPT_bb)) {
 154                 if (strcmp("skipbad", opt_bb) == 0)
 155                         bb_method = BB_SKIPBAD;
 156                 else if (strcmp("padbad", opt_bb) == 0)
 157                         bb_method = BB_PADBAD;
 158                 else
 159                         bb_show_usage();
 160         }
 161
 162         /* Pull it into a CPU register (hopefully) - smaller code that way */
 163         meminfo_writesize = meminfo.writesize;
 164
 165         if (mtdoffset & (meminfo_writesize - 1))
 166                 bb_error_msg_and_die("start address is not page aligned");
 167
 168         filebuf = xmalloc(meminfo_writesize);
 169         oobbuf = xmalloc(meminfo.oobsize);
 170
 171         oob.start  = 0;
 172         oob.length = meminfo.oobsize;
 173         oob.ptr    = oobbuf;
 174
 175         blockstart = mtdoffset & ~(meminfo.erasesize - 1);
 176         if (blockstart != mtdoffset) {
 177                 unsigned tmp;
 178                 /* mtdoffset is in the middle of an erase block, verify that
 179                  * this block is OK. Advance mtdoffset only if this block is
 180                  * bad.
 181                  */
 182                 tmp = next_good_eraseblock(fd, &meminfo, blockstart);
 183                 if (tmp != blockstart) {
 184                         /* bad block(s), advance mtdoffset */
 185                         if (IS_NANDDUMP) {
 186                                 if (bb_method == BB_PADBAD) {
 187                                         int bad_len = MIN(tmp, end_addr) - mtdoffset;
 188                                         dump_bad(&meminfo, bad_len, opts & OPT_o);
 189                                 }
 190                                 /* with option skipbad, increase the total length */
 191                                 if (bb_method == BB_SKIPBAD) {
 192                                         end_addr += (tmp - blockstart);
 193                                 }
 194                         }
 195                         mtdoffset = tmp;
 196                 }
 197         }
 198
 199         cnt = -1;
 200         limit = MIN(meminfo.size, end_addr);
 201         while (mtdoffset < limit) {
 202                 int input_fd = IS_NANDWRITE ? STDIN_FILENO : fd;
 203                 int output_fd = IS_NANDWRITE ? fd : STDOUT_FILENO;
 204
 205                 blockstart = mtdoffset & ~(meminfo.erasesize - 1);
 206                 if (blockstart == mtdoffset) {
 207                         /* starting a new eraseblock */
 208                         mtdoffset = next_good_eraseblock(fd, &meminfo, blockstart);
 209                         if (IS_NANDWRITE)
 210                                 printf("Writing at 0x%08x\n", mtdoffset);
 211                         else if (mtdoffset > blockstart) {
 212                                 if (bb_method == BB_PADBAD) {
 213                                         /* dump FF padded bad block */
 214                                         int bad_len = MIN(mtdoffset, limit) - blockstart;
 215                                         dump_bad(&meminfo, bad_len, opts & OPT_o);
 216                                 } else if (bb_method == BB_SKIPBAD) {
 217                                         /* for skipbad, increase the length */
 218                                         if ((end_addr + mtdoffset - blockstart) > end_addr)
 219                                                 end_addr += (mtdoffset - blockstart);
 220                                         else
 221                                                 end_addr = ~0;
 222                                         limit = MIN(meminfo.size, end_addr);
 223                                 }
 224                         }
 225                         if (mtdoffset >= limit)
 226                                 break;
 227                 }
 228                 xlseek(fd, mtdoffset, SEEK_SET);
 229
 230                 /* get some more data from input */
 231                 cnt = full_read(input_fd, filebuf, meminfo_writesize);
 232                 if (cnt == 0) {
 233                         /* even with -p, we do not pad past the end of input
 234                          * (-p only zero-pads last incomplete page)
 235                          */
 236                         break;
 237                 }
 238                 if (cnt < meminfo_writesize) {
 239                         if (IS_NANDDUMP)
 240                                 bb_error_msg_and_die("short read");
 241                         if (!(opts & OPT_p))
 242                                 bb_error_msg_and_die("input size is not rounded up to page size, "
 243                                                 "use -p to zero pad");
 244                         /* zero pad to end of write block */
 245                         memset(filebuf + cnt, 0, meminfo_writesize - cnt);
 246                 }
 247                 xwrite(output_fd, filebuf, meminfo_writesize);
 248
 249                 if (IS_NANDDUMP && (opts & OPT_o)) {
 250                         /* Dump OOB data */
 251                         oob.start = mtdoffset;
 252                         xioctl(fd, MEMREADOOB, &oob);
 253                         xwrite(output_fd, oobbuf, meminfo.oobsize);
 254                 }
 255
 256                 mtdoffset += meminfo_writesize;
 257                 if (cnt < meminfo_writesize)
 258                         break;
 259         }
 260
 261         if (IS_NANDWRITE && cnt != 0) {
 262                 /* We filled entire MTD, but did we reach EOF on input? */
 263                 if (full_read(STDIN_FILENO, filebuf, meminfo_writesize) != 0) {
 264                         /* no */
 265                         bb_error_msg_and_die("not enough space in MTD device");
 266                 }
 267         }
 268
 269         if (ENABLE_FEATURE_CLEAN_UP) {
 270                 free(filebuf);
 271                 close(fd);
 272         }
 273
 274         return EXIT_SUCCESS;
 275 }