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>

3 files changed, 121 insertions, 0 deletions

diff --git a/drivers/bootcount/Kconfig b/drivers/bootcount/Kconfig
new file mode 100644
index 0000000000..c9d627cce2
--- /dev/null
+++ b/drivers/bootcount/Kconfig
@@ -0,0 +1,58 @@
+#
+# Boot count configuration
+#
+
+menu "Boot count support"
+
+config BOOTCOUNT
+	bool "Enable Boot count support"
+	help
+	  Enable boot count support, which provides the ability to store the
+	  number of times the board has booted on a number of different
+	  persistent storage mediums.
+
+if BOOTCOUNT
+
+config BOOTCOUNT_EXT
+	bool "Boot counter on EXT filesystem"
+	help
+	  Add support for maintaining boot count in a file on an EXT
+	  filesystem.
+
+if BOOTCOUNT_EXT
+
+config SYS_BOOTCOUNT_EXT_INTERFACE
+	string "Interface on which to find boot counter EXT filesystem"
+	default "mmc"
+	depends on BOOTCOUNT_EXT
+	help
+	  Set the interface to use when locating the filesystem to use for the
+	  boot counter.
+
+config SYS_BOOTCOUNT_EXT_DEVPART
+	string "Partition of the boot counter EXT filesystem"
+	default "0:1"
+	depends on BOOTCOUNT_EXT
+	help
+	  Set the partition to use when locating the filesystem to use for the
+	  boot counter.
+
+config SYS_BOOTCOUNT_EXT_NAME
+	string "Path and filename of the EXT filesystem based boot counter"
+	default "/boot/failures"
+	depends on BOOTCOUNT_EXT
+	help
+	  Set the filename and path of the file used to store the boot counter.
+
+config SYS_BOOTCOUNT_ADDR
+	hex "RAM address used for reading and writing the boot counter"
+	default 0x7000A000
+	depends on BOOTCOUNT_EXT
+	help
+	  Set the address used for reading and writing the boot counter.
+
+endif
+
+endif
+
+endmenu
diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile
index ed9659ad97..45445d24bf 100644
--- a/drivers/bootcount/Makefile
+++ b/drivers/bootcount/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_BOOTCOUNT_AM33XX)	+= bootcount_davinci.o
 obj-$(CONFIG_BOOTCOUNT_RAM)	+= bootcount_ram.o
 obj-$(CONFIG_BOOTCOUNT_ENV)	+= bootcount_env.o
 obj-$(CONFIG_BOOTCOUNT_I2C)	+= bootcount_i2c.o
+obj-$(CONFIG_BOOTCOUNT_EXT)	+= bootcount_ext.o
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;
+}