mtd: add linksys_bootcount to the ipq40xx target

[openwrt/staging/wigyori.git] / package / system / mtd / src / linksys_bootcount_fix.c

diff --git a/package/system/mtd/src/linksys_bootcount_fix.c b/package/system/mtd/src/linksys_bootcount_fix.c
new file mode 100644 (file)
index 0000000..3fc3801
--- /dev/null
+++ b/package/system/mtd/src/linksys_bootcount_fix.c
@@ -0,0 +1,115 @@
+/*
+ * Linksys boot counter reset code for mtd
+ *
+ * Copyright (C) 2013 Jonas Gorski <jogo@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License v2
+ * as published by the Free Software Foundation.
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <endian.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+
+#include <sys/ioctl.h>
+#include <mtd/mtd-user.h>
+
+#include "mtd.h"
+
+#define BOOTCOUNT_MAGIC        0x20110811
+
+struct bootcounter {
+       uint32_t magic;
+       uint32_t count;
+       uint32_t checksum;
+};
+
+static char page[2048];
+
+int mtd_resetbc(const char *mtd)
+{
+       struct mtd_info_user mtd_info;
+       struct bootcounter *curr = (struct bootcounter *)page;
+       unsigned int i;
+       int last_count = 0;
+       int num_bc;
+       int fd;
+       int ret;
+
+       fd = mtd_check_open(mtd);
+
+       if (ioctl(fd, MEMGETINFO, &mtd_info) < 0) {
+               fprintf(stderr, "failed to get mtd info!\n");
+               return -1;
+       }
+
+       num_bc = mtd_info.size / 16;
+
+       for (i = 0; i < num_bc; i++) {
+               pread(fd, curr, sizeof(*curr), i * 16);
+
+               if (curr->magic != (BOOTCOUNT_MAGIC) && curr->magic != 0xffffffff) {
+                       fprintf(stderr, "unexpected magic %08x, bailing out\n", curr->magic);
+                       goto out;
+               }
+
+               if (curr->magic == 0xffffffff)
+                       break;
+
+               last_count = curr->count;
+       }
+
+       /* no need to do writes when last boot count is already 0 */
+       if (last_count == 0)
+               goto out;
+
+
+       if (i == num_bc) {
+               struct erase_info_user erase_info;
+               erase_info.start = 0;
+               erase_info.length = mtd_info.size;
+
+               /* erase block */
+               ret = ioctl(fd, MEMERASE, &erase_info);
+               if (ret < 0) {
+                       fprintf(stderr, "failed to erase block: %i\n", ret);
+                       return -1;
+               }
+
+               i = 0;
+       }
+
+       memset(curr, 0xff, 16);
+
+       curr->magic = BOOTCOUNT_MAGIC;
+       curr->count = 0;
+       curr->checksum = BOOTCOUNT_MAGIC;
+
+       ret = pwrite(fd, curr, 16, i * 16);
+       if (ret < 0)
+               fprintf(stderr, "failed to write: %i\n", ret);
+       sync();
+out:
+       close(fd);
+
+       return 0;
+}