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/* vi: set sw=4 ts=4: */
/* eraseall.c -- erase the whole of a MTD device
*
* Ported to busybox from mtd-utils.
*
* Copyright (C) 2000 Arcom Control System Ltd
*
* Renamed to flash_eraseall.c
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include <mtd/mtd-user.h>
#include <mtd/jffs2-user.h>
#define OPTION_J (1 << 0)
#define OPTION_Q (1 << 1)
#define _bitNAND (2)
#define isNAND (1 << _bitNAND)
#define bbtest (1 << 3)
/* This is used in the cpu_to_je/je_to_cpu macros in jffs2_user.h */
/* FIXME: target_endian should be const!
* FIXME: Also it sounds more sensible to use our own existing SWAP_ macros.
*/
/* const */ int target_endian = __BYTE_ORDER;
static uint32_t crc32(uint32_t val, const void *ss, int len,
uint32_t *crc32_table)
{
const unsigned char *s = ss;
while (--len >= 0)
val = crc32_table[(val ^ *s++) & 0xff] ^ (val >> 8);
return val;
}
static void show_progress(mtd_info_t *meminfo, erase_info_t *erase)
{
printf("\rErasing %d Kibyte @ %x -- %2llu %% complete.",
meminfo->erasesize / 1024, erase->start,
(unsigned long long) erase->start * 100 / meminfo->size);
fflush(stdout);
}
int flash_eraseall_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int flash_eraseall_main(int argc UNUSED_PARAM, char **argv)
{
struct jffs2_unknown_node cleanmarker;
mtd_info_t meminfo;
int fd, clmpos = 0, clmlen = 8;
erase_info_t erase;
struct stat st;
unsigned int flags;
char *mtd_name;
opt_complementary = "=1";
flags = getopt32(argv, "jq");
mtd_name = *(argv + optind);
xstat(mtd_name, &st);
if (!S_ISCHR(st.st_mode))
bb_error_msg_and_die("%s: not a char device", mtd_name);
fd = xopen(mtd_name, O_RDWR);
xioctl(fd, MEMGETINFO, &meminfo);
erase.length = meminfo.erasesize;
flags |= bbtest | ((meminfo.type == MTD_NANDFLASH) << _bitNAND);
if (flags & OPTION_J) {
uint32_t *crc32_table;
crc32_table = crc32_filltable(NULL, 0);
cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
if (!(flags & isNAND))
cleanmarker.totlen = cpu_to_je32 (sizeof (struct jffs2_unknown_node));
else {
struct nand_oobinfo oobinfo;
xioctl(fd, MEMGETOOBSEL, &oobinfo);
/* Check for autoplacement */
if (oobinfo.useecc == MTD_NANDECC_AUTOPLACE) {
/* Get the position of the free bytes */
if (!oobinfo.oobfree[0][1])
bb_error_msg_and_die("Autoplacement selected and no empty space in oob");
clmpos = oobinfo.oobfree[0][0];
clmlen = oobinfo.oobfree[0][1];
if (clmlen > 8)
clmlen = 8;
} else {
/* Legacy mode */
switch (meminfo.oobsize) {
case 8:
clmpos = 6;
clmlen = 2;
break;
case 16:
clmpos = 8;
clmlen = 8;
break;
case 64:
clmpos = 16;
clmlen = 8;
break;
}
}
cleanmarker.totlen = cpu_to_je32(8);
}
cleanmarker.hdr_crc = cpu_to_je32(crc32(0, &cleanmarker, sizeof(struct jffs2_unknown_node) - 4,
crc32_table));
}
for (erase.start = 0; erase.start < meminfo.size;
erase.start += meminfo.erasesize) {
if (flags & bbtest) {
int ret;
loff_t offset = erase.start;
ret = ioctl(fd, MEMGETBADBLOCK, &offset);
if (ret > 0) {
if (!(flags & OPTION_Q))
bb_info_msg("\nSkipping bad block at 0x%08x", erase.start);
continue;
} else if (ret < 0) {
/* Black block table is not available on certain flash
* types e.g. NOR
*/
if (errno == EOPNOTSUPP) {
flags =~ bbtest;
if (flags & isNAND)
bb_error_msg_and_die("%s: Bad block check not available",
mtd_name);
} else {
bb_perror_msg_and_die("\n%s: MTD %s failure",
mtd_name, "get bad block ");
}
}
}
if (!(flags & OPTION_Q))
show_progress(&meminfo, &erase);
xioctl(fd, MEMERASE, &erase);
/* format for JFFS2 ? */
if (!(flags & OPTION_J))
continue;
/* write cleanmarker */
if (flags & isNAND) {
struct mtd_oob_buf oob;
oob.ptr = (unsigned char *) &cleanmarker;
oob.start = erase.start + clmpos;
oob.length = clmlen;
xioctl (fd, MEMWRITEOOB, &oob);
} else {
if (lseek (fd, erase.start, SEEK_SET) < 0) {
bb_perror_msg("\n%s: MTD %s failure", mtd_name, "seek");
continue;
}
if (write (fd , &cleanmarker, sizeof (cleanmarker)) != sizeof (cleanmarker)) {
bb_perror_msg("\n%s: MTD %s failure", mtd_name, "write");
continue;
}
}
if (!(flags & OPTION_Q))
printf(" Cleanmarker written at %x.", erase.start);
}
if (!(flags & OPTION_Q)) {
show_progress(&meminfo, &erase);
bb_putchar('\n');
}
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
return EXIT_SUCCESS;
}
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