bootcount: add support for bootcounter on EXT filesystem

Add support for bootcounter on an EXT filesystem.
Sync configuration whitelist.

Signed-off-by: Ian Ray <ian.ray@ge.com>
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>

1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/bootcount/bootcount_ext.c b/drivers/bootcount/bootcount_ext.c
new file mode 100644
index 0000000000..e0dd21ba6a
--- /dev/null
+++ b/drivers/bootcount/bootcount_ext.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2017 General Electric Company. All rights reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <bootcount.h>
+#include <fs.h>
+#include <mapmem.h>
+
+#define BC_MAGIC	0xbc
+
+void bootcount_store(ulong a)
+{
+	u8 *buf;
+	loff_t len;
+	int ret;
+
+	if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
+			   CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
+		puts("Error selecting device\n");
+		return;
+	}
+
+	buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 2);
+	buf[0] = BC_MAGIC;
+	buf[1] = (a & 0xff);
+	unmap_sysmem(buf);
+
+	ret = fs_write(CONFIG_SYS_BOOTCOUNT_EXT_NAME,
+		       CONFIG_SYS_BOOTCOUNT_ADDR, 0, 2, &len);
+	if (ret != 0)
+		puts("Error storing bootcount\n");
+}
+
+ulong bootcount_load(void)
+{
+	u8 *buf;
+	loff_t len_read;
+	int ret;
+
+	if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
+			   CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
+		puts("Error selecting device\n");
+		return 0;
+	}
+
+	ret = fs_read(CONFIG_SYS_BOOTCOUNT_EXT_NAME, CONFIG_SYS_BOOTCOUNT_ADDR,
+		      0, 2, &len_read);
+	if (ret != 0 || len_read != 2) {
+		puts("Error loading bootcount\n");
+		return 0;
+	}
+
+	buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 2);
+	if (buf[0] == BC_MAGIC)
+		ret = buf[1];
+
+	unmap_sysmem(buf);
+
+	return ret;
+}