- add flash_eraseall

This is the result after converting mtd-utils' flash_eraseall to BB.
The functionality given by this patch almost the same except that this
one does not support long options.
I needed this tool a system which does not have a lot of flash for RFS
and merging this into BB as the only way out.

[bigeasy@]$ ./scripts/bloat-o-meter bb_wo_fl bb_w_fl
function                                             old     new   delta
flash_eraseall_main                                    -    1072   +1072
show_progress                                          -      62     +62
packed_usage                                       25156   25176     +20
applet_names                                        1958    1973     +15
applet_main                                         2352    2360      +8
target_endian                                          -       4      +4
applet_nameofs                                       588     590      +2
applet_install_loc                                   147     148      +1
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 5/0 up/down: 1184/0)           Total: 1184 bytes
[bigeasy@]$ size miscutils/flash_eraseall.o
   text    data     bss     dec     hex filename
   1586       4       0    1590     636 miscutils/flash_eraseall.o

Signed-off-by: Benedigt Spranger <b.spranger@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

6 files changed, 207 insertions, 0 deletions

diff --git a/Makefile.flags b/Makefile.flags
index ad8d5e1f9..4c24ad690 100644
--- a/Makefile.flags
+++ b/Makefile.flags
@@ -23,6 +23,7 @@ CFLAGS += $(call cc-option,-Wwrite-strings,)
 CFLAGS += $(call cc-option,-Wundef,)
 CFLAGS += $(call cc-option,-Wstrict-prototypes,)
 CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
+CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,)
 CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
 # warn about C99 declaration after statement
 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
diff --git a/include/applets.h b/include/applets.h
index af21a0d4a..15dcbdf5e 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -155,6 +155,8 @@ USE_FDISK(APPLET(fdisk, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_FEATURE_GREP_FGREP_ALIAS(APPLET_ODDNAME(fgrep, grep, _BB_DIR_BIN, _BB_SUID_NEVER, fgrep))
 USE_FIND(APPLET_NOEXEC(find, find, _BB_DIR_USR_BIN, _BB_SUID_NEVER, find))
 USE_FINDFS(APPLET(findfs, _BB_DIR_SBIN, _BB_SUID_MAYBE))
+//USE_FLASH_ERASEALL(APPLET_ODDNAME(flash_eraseall, flash_eraseall, _BB_DIR_USR_SBIN, _BB_SUID_NEVER, flash_eraseall))
+USE_FLASH_ERASEALL(APPLET(flash_eraseall, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_FOLD(APPLET(fold, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_FREE(APPLET(free, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_FREERAMDISK(APPLET(freeramdisk, _BB_DIR_SBIN, _BB_SUID_NEVER))
diff --git a/include/usage.h b/include/usage.h
index 52af47e58..0e606609d 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -1217,6 +1217,14 @@
        "$ find / -name passwd\n" \
        "/etc/passwd\n"
 
+#define flash_eraseall_trivial_usage \
+       "[-jq] MTD_DEVICE"
+#define flash_eraseall_full_usage "\n\n" \
+       "Erase an MTD device\n" \
+     "\nOptions:" \
+     "\n        -j      format the device for jffs2" \
+     "\n        -q      don't display progress messages"
+
 #define fold_trivial_usage \
        "[-bs] [-w WIDTH] [FILE]"
 #define fold_full_usage "\n\n" \
diff --git a/miscutils/Config.in b/miscutils/Config.in
index c8d7253d8..62be3e63e 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -250,6 +250,13 @@ config FBSPLASH
             "NN" (ASCII decimal number) - percentage to show on progress bar
             "exit" - well you guessed it
 
+config FLASH_ERASEALL
+        bool "flash_eraseall"
+        default n
+        help
+          The flash_eraseall binary from mtd-utils as of git head c4c6a59eb.
+          This utility is used to erase the whole MTD device.
+
 config IONICE
         bool "ionice"
         default n
diff --git a/miscutils/Kbuild b/miscutils/Kbuild
index 7665130e5..23d7d8d49 100644
--- a/miscutils/Kbuild
+++ b/miscutils/Kbuild
@@ -16,6 +16,7 @@ lib-$(CONFIG_DEVFSD)      += devfsd.o
 lib-$(CONFIG_DEVMEM)      += devmem.o
 lib-$(CONFIG_EJECT)       += eject.o
 lib-$(CONFIG_FBSPLASH)    += fbsplash.o
+lib-$(CONFIG_FLASH_ERASEALL)    += flash_eraseall.o
 lib-$(CONFIG_IONICE)      += ionice.o
 lib-$(CONFIG_HDPARM)      += hdparm.o
 lib-$(CONFIG_INOTIFYD)    += inotifyd.o
diff --git a/miscutils/flash_eraseall.c b/miscutils/flash_eraseall.c
new file mode 100644
index 000000000..79028d780
--- /dev/null
+++ b/miscutils/flash_eraseall.c
@@ -0,0 +1,188 @@
+/* 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
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "libbb.h"
+
+#include <mtd/mtd-user.h>
+#include <mtd/jffs2-user.h>
+
+#define OPTION_J        (1 << 0)
+#define OPTION_Q        (1 << 1)
+
+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, char **argv)
+{
+        struct jffs2_unknown_node cleanmarker;
+        mtd_info_t meminfo;
+        int fd, clmpos = 0, clmlen = 8;
+        erase_info_t erase;
+        struct stat st;
+        int isNAND, bbtest = 1;
+        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;
+        isNAND = meminfo.type == MTD_NANDFLASH ? 1 : 0;
+
+        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 (!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 (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) {
+                                        bbtest = 0;
+                                        if (isNAND)
+                                                bb_error_msg_and_die("%s: Bad block check not available",
+                                                                mtd_name);
+                                } else {
+                                        bb_error_msg_and_die("\n%s: MTD get bad block failed: %s",
+                                                        mtd_name, strerror(errno));
+                                }
+                        }
+                }
+
+                if (!(flags & OPTION_Q))
+                        show_progress(&meminfo, &erase);
+
+                xioctl(fd, MEMERASE, &erase);
+
+                /* format for JFFS2 ? */
+                if (!(flags & OPTION_J))
+                        continue;
+
+                /* write cleanmarker */
+                if (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_error_msg("\n%s: MTD lseek failure: %s", mtd_name, strerror(errno));
+                                continue;
+                        }
+                        if (write (fd , &cleanmarker, sizeof (cleanmarker)) != sizeof (cleanmarker)) {
+                                bb_error_msg("\n%s: MTD write failure: %s", mtd_name, strerror(errno));
+                                continue;
+                        }
+                }
+                if (!(flags & OPTION_Q))
+                        printf(" Cleanmarker written at %x.", erase.start);
+        }
+        if (!(flags & OPTION_Q)) {
+                show_progress(&meminfo, &erase);
+                printf("\n");
+        }
+
+        return EXIT_SUCCESS;
+}