drivers: bootcount: Add support for ANY filesystem

Add support to save boot count variable in ANY filesystem. Tested with
FAT and EXT.

Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Philip Oberfichtner <pro@denx.de>
Signed-off-by: Vasileios Amoiridis <vasileios.amoiridis@cern.ch>

1 files changed, 83 insertions, 0 deletions

diff --git a/drivers/bootcount/bootcount_fs.c b/drivers/bootcount/bootcount_fs.c
new file mode 100644
index 00000000000..569592d8aad
--- /dev/null
+++ b/drivers/bootcount/bootcount_fs.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2017 General Electric Company. All rights reserved.
+ */
+
+#include <bootcount.h>
+#include <fs.h>
+#include <mapmem.h>
+
+#define BC_MAGIC	0xbd
+#define BC_VERSION	1
+
+typedef struct {
+	u8 magic;
+	u8 version;
+	u8 bootcount;
+	u8 upgrade_available;
+} bootcount_ext_t;
+
+static u8 upgrade_available = 1;
+
+void bootcount_store(ulong a)
+{
+	bootcount_ext_t *buf;
+	loff_t len;
+	int ret;
+
+	if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_FS_INTERFACE,
+			   CONFIG_SYS_BOOTCOUNT_FS_DEVPART, FS_TYPE_ANY)) {
+		puts("Error selecting device\n");
+		return;
+	}
+
+	/* Only update bootcount during upgrade process */
+	if (!upgrade_available)
+		return;
+
+	buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, sizeof(bootcount_ext_t));
+	buf->magic = BC_MAGIC;
+	buf->version = BC_VERSION;
+	buf->bootcount = (a & 0xff);
+	buf->upgrade_available = upgrade_available;
+	unmap_sysmem(buf);
+
+	ret = fs_write(CONFIG_SYS_BOOTCOUNT_FS_NAME,
+		       CONFIG_SYS_BOOTCOUNT_ADDR, 0, sizeof(bootcount_ext_t),
+		       &len);
+	if (ret != 0)
+		puts("Error storing bootcount\n");
+}
+
+ulong bootcount_load(void)
+{
+	bootcount_ext_t *buf;
+	loff_t len_read;
+	int ret;
+
+	if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_FS_INTERFACE,
+			   CONFIG_SYS_BOOTCOUNT_FS_DEVPART, FS_TYPE_ANY)) {
+		puts("Error selecting device\n");
+		return 0;
+	}
+
+	ret = fs_read(CONFIG_SYS_BOOTCOUNT_FS_NAME, CONFIG_SYS_BOOTCOUNT_ADDR,
+		      0, sizeof(bootcount_ext_t), &len_read);
+	if (ret != 0 || len_read != sizeof(bootcount_ext_t)) {
+		puts("Error loading bootcount\n");
+		return 0;
+	}
+
+	buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, sizeof(bootcount_ext_t));
+	if (buf->magic == BC_MAGIC && buf->version == BC_VERSION) {
+		upgrade_available = buf->upgrade_available;
+		if (upgrade_available)
+			ret = buf->bootcount;
+	} else {
+		puts("Incorrect bootcount file\n");
+	}
+
+	unmap_sysmem(buf);
+
+	return ret;
+}