ARM: highbank: Add boot counter support

Add boot counter support using an sysreg which is persistent across reset.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/highbank/bootcount.c b/arch/arm/cpu/armv7/highbank/bootcount.c
new file mode 100644
index 0000000000..9ca06567a8
--- /dev/null
+++ b/arch/arm/cpu/armv7/highbank/bootcount.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2011 Calxeda, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_BOOTCOUNT_LIMIT
+void bootcount_store(ulong a)
+{
+	writel((BOOTCOUNT_MAGIC & 0xffff0000) | a, CONFIG_SYS_BOOTCOUNT_ADDR);
+}
+
+ulong bootcount_load(void)
+{
+	u32 tmp = readl(CONFIG_SYS_BOOTCOUNT_ADDR);
+
+	if ((tmp & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
+		return 0;
+	else
+		return tmp & 0x0000ffff;
+}
+#endif