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

   1 /* vi: set sw=4 ts=4: */
   2 /* eraseall.c -- erase the whole of a MTD device
   3  *
   4  * Ported to busybox from mtd-utils.
   5  *
   6  * Copyright (C) 2000 Arcom Control System Ltd
   7  *
   8  * Renamed to flash_eraseall.c
   9  *
  10  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  11  */
  12
  13 //usage:#define flash_eraseall_trivial_usage
  14 //usage:       "[-jq] MTD_DEVICE"
  15 //usage:#define flash_eraseall_full_usage "\n\n"
  16 //usage:       "Erase an MTD device\n"
  17 //usage:     "\n        -j      Format the device for jffs2"
  18 //usage:     "\n        -q      Don't display progress messages"
  19
  20 #include "libbb.h"
  21 #include <mtd/mtd-user.h>
  22 #include <linux/jffs2.h>
  23
  24 #define OPTION_J  (1 << 0)
  25 #define OPTION_Q  (1 << 1)
  26 #define IS_NAND   (1 << 2)
  27 #define BBTEST    (1 << 3)
  28
  29 /* mtd/jffs2-user.h used to have this atrocity:
  30 extern int target_endian;
  31
  32 #define t16(x) ({ __u16 __b = (x); (target_endian==__BYTE_ORDER)?__b:bswap_16(__b); })
  33 #define t32(x) ({ __u32 __b = (x); (target_endian==__BYTE_ORDER)?__b:bswap_32(__b); })
  34
  35 #define cpu_to_je16(x) ((jint16_t){t16(x)})
  36 #define cpu_to_je32(x) ((jint32_t){t32(x)})
  37 #define cpu_to_jemode(x) ((jmode_t){t32(x)})
  38
  39 #define je16_to_cpu(x) (t16((x).v16))
  40 #define je32_to_cpu(x) (t32((x).v32))
  41 #define jemode_to_cpu(x) (t32((x).m))
  42
  43 but mtd/jffs2-user.h is gone now (at least 2.6.31.6 does not have it anymore)
  44 */
  45
  46 /* We always use native endianness */
  47 #undef cpu_to_je16
  48 #undef cpu_to_je32
  49 #define cpu_to_je16(v) ((jint16_t){(v)})
  50 #define cpu_to_je32(v) ((jint32_t){(v)})
  51
  52 static void show_progress(mtd_info_t *meminfo, erase_info_t *erase)
  53 {
  54         printf("\rErasing %u Kibyte @ %x - %2u%% complete.",
  55                 (unsigned)meminfo->erasesize / 1024,
  56                 erase->start,
  57                 (unsigned) ((unsigned long long) erase->start * 100 / meminfo->size)
  58         );
  59         fflush_all();
  60 }
  61
  62 int flash_eraseall_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  63 int flash_eraseall_main(int argc UNUSED_PARAM, char **argv)
  64 {
  65         struct jffs2_unknown_node cleanmarker;
  66         mtd_info_t meminfo;
  67         int fd, clmpos, clmlen;
  68         erase_info_t erase;
  69         struct stat st;
  70         unsigned int flags;
  71         char *mtd_name;
  72
  73         opt_complementary = "=1";
  74         flags = BBTEST | getopt32(argv, "jq");
  75
  76         mtd_name = argv[optind];
  77         fd = xopen(mtd_name, O_RDWR);
  78         fstat(fd, &st);
  79         if (!S_ISCHR(st.st_mode))
  80                 bb_error_msg_and_die("%s: not a char device", mtd_name);
  81
  82         xioctl(fd, MEMGETINFO, &meminfo);
  83         erase.length = meminfo.erasesize;
  84         if (meminfo.type == MTD_NANDFLASH)
  85                 flags |= IS_NAND;
  86
  87         clmpos = 0;
  88         clmlen = 8;
  89         if (flags & OPTION_J) {
  90                 uint32_t *crc32_table;
  91
  92                 crc32_table = crc32_filltable(NULL, 0);
  93
  94                 cleanmarker.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
  95                 cleanmarker.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER);
  96                 if (!(flags & IS_NAND))
  97                         cleanmarker.totlen = cpu_to_je32(sizeof(struct jffs2_unknown_node));
  98                 else {
  99                         struct nand_oobinfo oobinfo;
 100
 101                         xioctl(fd, MEMGETOOBSEL, &oobinfo);
 102
 103                         /* Check for autoplacement */
 104                         if (oobinfo.useecc == MTD_NANDECC_AUTOPLACE) {
 105                                 /* Get the position of the free bytes */
 106                                 clmpos = oobinfo.oobfree[0][0];
 107                                 clmlen = oobinfo.oobfree[0][1];
 108                                 if (clmlen > 8)
 109                                         clmlen = 8;
 110                                 if (clmlen == 0)
 111                                         bb_error_msg_and_die("autoplacement selected and no empty space in oob");
 112                         } else {
 113                                 /* Legacy mode */
 114                                 switch (meminfo.oobsize) {
 115                                 case 8:
 116                                         clmpos = 6;
 117                                         clmlen = 2;
 118                                         break;
 119                                 case 16:
 120                                         clmpos = 8;
 121                                         /*clmlen = 8;*/
 122                                         break;
 123                                 case 64:
 124                                         clmpos = 16;
 125                                         /*clmlen = 8;*/
 126                                         break;
 127                                 }
 128                         }
 129                         cleanmarker.totlen = cpu_to_je32(8);
 130                 }
 131
 132                 cleanmarker.hdr_crc = cpu_to_je32(
 133                         crc32_block_endian0(0, &cleanmarker, sizeof(struct jffs2_unknown_node) - 4, crc32_table)
 134                 );
 135         }
 136
 137         /* Don't want to destroy progress indicator by bb_error_msg's */
 138         applet_name = xasprintf("\n%s: %s", applet_name, mtd_name);
 139
 140         for (erase.start = 0; erase.start < meminfo.size;
 141              erase.start += meminfo.erasesize) {
 142                 if (flags & BBTEST) {
 143                         int ret;
 144                         loff_t offset = erase.start;
 145
 146                         ret = ioctl(fd, MEMGETBADBLOCK, &offset);
 147                         if (ret > 0) {
 148                                 if (!(flags & OPTION_Q))
 149                                         bb_info_msg("\nSkipping bad block at 0x%08x", erase.start);
 150                                 continue;
 151                         }
 152                         if (ret < 0) {
 153                                 /* Black block table is not available on certain flash
 154                                  * types e.g. NOR
 155                                  */
 156                                 if (errno == EOPNOTSUPP) {
 157                                         flags &= ~BBTEST;
 158                                         if (flags & IS_NAND)
 159                                                 bb_error_msg_and_die("bad block check not available");
 160                                 } else {
 161                                         bb_perror_msg_and_die("MEMGETBADBLOCK error");
 162                                 }
 163                         }
 164                 }
 165
 166                 if (!(flags & OPTION_Q))
 167                         show_progress(&meminfo, &erase);
 168
 169                 xioctl(fd, MEMERASE, &erase);
 170
 171                 /* format for JFFS2 ? */
 172                 if (!(flags & OPTION_J))
 173                         continue;
 174
 175                 /* write cleanmarker */
 176                 if (flags & IS_NAND) {
 177                         struct mtd_oob_buf oob;
 178
 179                         oob.ptr = (unsigned char *) &cleanmarker;
 180                         oob.start = erase.start + clmpos;
 181                         oob.length = clmlen;
 182                         xioctl(fd, MEMWRITEOOB, &oob);
 183                 } else {
 184                         xlseek(fd, erase.start, SEEK_SET);
 185                         /* if (lseek(fd, erase.start, SEEK_SET) < 0) {
 186                                 bb_perror_msg("MTD %s failure", "seek");
 187                                 continue;
 188                         } */
 189                         xwrite(fd, &cleanmarker, sizeof(cleanmarker));
 190                         /* if (write(fd, &cleanmarker, sizeof(cleanmarker)) != sizeof(cleanmarker)) {
 191                                 bb_perror_msg("MTD %s failure", "write");
 192                                 continue;
 193                         } */
 194                 }
 195                 if (!(flags & OPTION_Q))
 196                         printf(" Cleanmarker written at %x.", erase.start);
 197         }
 198         if (!(flags & OPTION_Q)) {
 199                 show_progress(&meminfo, &erase);
 200                 bb_putchar('\n');
 201         }
 202
 203         if (ENABLE_FEATURE_CLEAN_UP)
 204                 close(fd);
 205         return EXIT_SUCCESS;
 206 }