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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 source tree.
*/
//config:config FLASH_ERASEALL
//config: bool "flash_eraseall (5.5 kb)"
//config: default n # doesn't build on Ubuntu 8.04
//config: help
//config: The flash_eraseall binary from mtd-utils as of git head c4c6a59eb.
//config: This utility is used to erase the whole MTD device.
//applet:IF_FLASH_ERASEALL(APPLET(flash_eraseall, BB_DIR_USR_SBIN, BB_SUID_DROP))
/* not NOEXEC: if flash operation stalls, use less memory in "hung" process */
//kbuild:lib-$(CONFIG_FLASH_ERASEALL) += flash_eraseall.o
//usage:#define flash_eraseall_trivial_usage
//usage: "[-jNq] MTD_DEVICE"
//usage:#define flash_eraseall_full_usage "\n\n"
//usage: "Erase an MTD device\n"
//usage: "\n -j Format the device for jffs2"
//usage: "\n -N Don't skip bad blocks"
//usage: "\n -q Don't display progress messages"
#include "libbb.h"
#include <mtd/mtd-user.h>
#include <linux/jffs2.h>
#define OPTION_J (1 << 0)
#define OPTION_N (1 << 1)
#define OPTION_Q (1 << 2)
#define IS_NAND (1 << 3)
/* mtd/jffs2-user.h used to have this atrocity:
extern int target_endian;
#define t16(x) ({ __u16 __b = (x); (target_endian==__BYTE_ORDER)?__b:bswap_16(__b); })
#define t32(x) ({ __u32 __b = (x); (target_endian==__BYTE_ORDER)?__b:bswap_32(__b); })
#define cpu_to_je16(x) ((jint16_t){t16(x)})
#define cpu_to_je32(x) ((jint32_t){t32(x)})
#define cpu_to_jemode(x) ((jmode_t){t32(x)})
#define je16_to_cpu(x) (t16((x).v16))
#define je32_to_cpu(x) (t32((x).v32))
#define jemode_to_cpu(x) (t32((x).m))
but mtd/jffs2-user.h is gone now (at least 2.6.31.6 does not have it anymore)
*/
/* We always use native endianness */
#undef cpu_to_je16
#undef cpu_to_je32
#define cpu_to_je16(v) ((jint16_t){(v)})
#define cpu_to_je32(v) ((jint32_t){(v)})
static void show_progress(mtd_info_t *meminfo, erase_info_t *erase)
{
printf("\rErasing %u Kibyte @ %x - %2u%% complete.",
(unsigned)meminfo->erasesize / 1024,
erase->start,
(unsigned) ((unsigned long long) erase->start * 100 / meminfo->size)
);
fflush_all();
}
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, clmlen;
erase_info_t erase;
struct stat st;
unsigned int flags;
char *mtd_name;
flags = getopt32(argv, "^" "jNq" "\0" "=1");
mtd_name = argv[optind];
fd = xopen(mtd_name, O_RDWR);
fstat(fd, &st);
if (!S_ISCHR(st.st_mode))
bb_error_msg_and_die("%s: not a char device", mtd_name);
xioctl(fd, MEMGETINFO, &meminfo);
erase.length = meminfo.erasesize;
if (meminfo.type == MTD_NANDFLASH)
flags |= IS_NAND;
clmpos = 0;
clmlen = 8;
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 & IS_NAND))
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 */
clmpos = oobinfo.oobfree[0][0];
clmlen = oobinfo.oobfree[0][1];
if (clmlen > 8)
clmlen = 8;
if (clmlen == 0)
bb_error_msg_and_die("autoplacement selected and no empty space in oob");
} 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_block_endian0(0, &cleanmarker, sizeof(struct jffs2_unknown_node) - 4, crc32_table)
);
}
/* Don't want to destroy progress indicator by bb_error_msg's */
applet_name = xasprintf("\n%s: %s", applet_name, mtd_name);
for (erase.start = 0; erase.start < meminfo.size;
erase.start += meminfo.erasesize) {
if (!(flags & OPTION_N)) {
int ret;
loff_t offset = erase.start;
ret = ioctl(fd, MEMGETBADBLOCK, &offset);
if (ret > 0) {
if (!(flags & OPTION_Q))
printf("\nSkipping bad block at 0x%08x\n", erase.start);
continue;
}
if (ret < 0) {
/* Black block table is not available on certain flash
* types e.g. NOR
*/
if (errno == EOPNOTSUPP) {
flags |= OPTION_N;
if (flags & IS_NAND)
bb_error_msg_and_die("bad block check not available");
} else {
bb_perror_msg_and_die("MEMGETBADBLOCK error");
}
}
}
if (!(flags & OPTION_Q))
show_progress(&meminfo, &erase);
xioctl(fd, MEMERASE, &erase);
/* format for JFFS2 ? */
if (!(flags & OPTION_J))
continue;
/* write cleanmarker */
if (flags & IS_NAND) {
struct mtd_oob_buf oob;
oob.ptr = (unsigned char *) &cleanmarker;
oob.start = erase.start + clmpos;
oob.length = clmlen;
xioctl(fd, MEMWRITEOOB, &oob);
} else {
xlseek(fd, erase.start, SEEK_SET);
/* if (lseek(fd, erase.start, SEEK_SET) < 0) {
bb_perror_msg("MTD %s failure", "seek");
continue;
} */
xwrite(fd, &cleanmarker, sizeof(cleanmarker));
/* if (write(fd, &cleanmarker, sizeof(cleanmarker)) != sizeof(cleanmarker)) {
bb_perror_msg("MTD %s failure", "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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