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path: root/drivers/bootcount/bootcount_i2c.c
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Diffstat (limited to 'drivers/bootcount/bootcount_i2c.c')
-rw-r--r--drivers/bootcount/bootcount_i2c.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/bootcount/bootcount_i2c.c b/drivers/bootcount/bootcount_i2c.c
new file mode 100644
index 0000000000..e27b168c55
--- /dev/null
+++ b/drivers/bootcount/bootcount_i2c.c
@@ -0,0 +1,44 @@
+/*
+ * (C) Copyright 2013
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <bootcount.h>
+#include <linux/compiler.h>
+#include <i2c.h>
+
+#define BC_MAGIC 0xbc
+
+void bootcount_store(ulong a)
+{
+ unsigned char buf[3];
+ int ret;
+
+ buf[0] = BC_MAGIC;
+ buf[1] = (a & 0xff);
+ ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
+ CONFIG_BOOTCOUNT_ALEN, buf, 2);
+ if (ret != 0)
+ puts("Error writing bootcount\n");
+}
+
+ulong bootcount_load(void)
+{
+ unsigned char buf[3];
+ int ret;
+
+ ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR,
+ CONFIG_BOOTCOUNT_ALEN, buf, 2);
+ if (ret != 0) {
+ puts("Error loading bootcount\n");
+ return 0;
+ }
+ if (buf[0] == BC_MAGIC)
+ return buf[1];
+
+ bootcount_store(0);
+
+ return 0;
+}