mvebu: add support for the Linksys boot counter

The u-boot boot counter was never reset after a successful boot,
which sometimes could make some variables become out of sync.
This patch adds support for the boot counter and enables
auto_recovery unconditionally.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: Rob Mosher <nyt-openwrt@countercultured.net>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>

SVN-Revision: 46690

4 files changed, 128 insertions, 0 deletions

diff --git a/package/system/mtd/src/Makefile b/package/system/mtd/src/Makefile
index 27ac339005..40a165e4e6 100644
--- a/package/system/mtd/src/Makefile
+++ b/package/system/mtd/src/Makefile
@@ -10,6 +10,7 @@ obj.brcm47xx = $(obj.brcm)
 obj.bcm53xx = $(obj.brcm)
 obj.brcm63xx = imagetag.o
 obj.ramips = $(obj.seama)
+obj.mvebu = linksys_bootcount.o
 
 ifdef FIS_SUPPORT
   obj += fis.o
diff --git a/package/system/mtd/src/linksys_bootcount.c b/package/system/mtd/src/linksys_bootcount.c
new file mode 100644
index 0000000000..95f75fe4ba
--- /dev/null
+++ b/package/system/mtd/src/linksys_bootcount.c
@@ -0,0 +1,114 @@
+/*
+ * 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 <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 / mtd_info.writesize;
+
+	for (i = 0; i < num_bc; i++) {
+		pread(fd, curr, sizeof(*curr), i * mtd_info.writesize);
+
+		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, mtd_info.writesize);
+
+	curr->magic = BOOTCOUNT_MAGIC;
+	curr->count = 0;
+	curr->checksum = BOOTCOUNT_MAGIC;
+
+	ret = pwrite(fd, curr, mtd_info.writesize, i * mtd_info.writesize);
+	if (ret < 0)
+		fprintf(stderr, "failed to write: %i\n", ret);
+	sync();
+out:
+	close(fd);
+
+	return 0;
+}
diff --git a/package/system/mtd/src/mtd.c b/package/system/mtd/src/mtd.c
index 741b57b480..02476306f6 100644
--- a/package/system/mtd/src/mtd.c
+++ b/package/system/mtd/src/mtd.c
@@ -640,6 +640,10 @@ static void usage(void)
 	"        verify <imagefile>|-    verify <imagefile> (use - for stdin) to device\n"
 	"        write <imagefile>|-     write <imagefile> (use - for stdin) to device\n"
 	"        jffs2write <file>       append <file> to the jffs2 partition on the device\n");
+	if (mtd_resetbc) {
+	    fprintf(stderr,
+	"        resetbc <device>        reset the uboot boot counter\n");
+	}
 	if (mtd_fixtrx) {
 	    fprintf(stderr,
 	"        fixtrx                  fix the checksum in a trx header on first boot\n");
@@ -706,6 +710,7 @@ int main (int argc, char **argv)
 		CMD_FIXSEAMA,
 		CMD_VERIFY,
 		CMD_DUMP,
+		CMD_RESETBC,
 	} cmd = -1;
 
 	erase[0] = NULL;
@@ -800,6 +805,9 @@ int main (int argc, char **argv)
 	} else if ((strcmp(argv[0], "erase") == 0) && (argc == 2)) {
 		cmd = CMD_ERASE;
 		device = argv[1];
+	} else if (((strcmp(argv[0], "resetbc") == 0) && (argc == 2)) && mtd_resetbc) {
+		cmd = CMD_RESETBC;
+		device = argv[1];
 	} else if (((strcmp(argv[0], "fixtrx") == 0) && (argc == 2)) && mtd_fixtrx) {
 		cmd = CMD_FIXTRX;
 		device = argv[1];
@@ -892,6 +900,10 @@ int main (int argc, char **argv)
 		    if (mtd_fixtrx) {
 			    mtd_fixtrx(device, offset);
             }
+		case CMD_RESETBC:
+		    if (mtd_resetbc) {
+			    mtd_resetbc(device);
+            }
 		case CMD_FIXSEAMA:
 			if (mtd_fixseama)
 			    mtd_fixseama(device, 0);
diff --git a/package/system/mtd/src/mtd.h b/package/system/mtd/src/mtd.h
index d94f394396..fb37b8b9fa 100644
--- a/package/system/mtd/src/mtd.h
+++ b/package/system/mtd/src/mtd.h
@@ -27,4 +27,5 @@ extern int trx_fixup(int fd, const char *name)  __attribute__ ((weak));
 extern int trx_check(int imagefd, const char *mtd, char *buf, int *len) __attribute__ ((weak));
 extern int mtd_fixtrx(const char *mtd, size_t offset) __attribute__ ((weak));
 extern int mtd_fixseama(const char *mtd, size_t offset) __attribute__ ((weak));
+extern int mtd_resetbc(const char *mtd) __attribute__ ((weak));
 #endif /* __mtd_h */