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