Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / bootcount / bootcount_blackfin.c

diff --git a/qemu/roms/u-boot/drivers/bootcount/bootcount_blackfin.c b/qemu/roms/u-boot/drivers/bootcount/bootcount_blackfin.c
new file mode 100644 (file)
index 0000000..6cf6dd5
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/bootcount/bootcount_blackfin.c
@@ -0,0 +1,34 @@
+/*
+ * functions for handling bootcount support
+ *
+ * Copyright (c) 2010 Analog Devices Inc.
+ *
+ * Licensed under the 2-clause BSD.
+ */
+
+/* This version uses one 32bit storage and combines the magic/count */
+
+#include <common.h>
+
+/* We abuse the EVT0 MMR for bootcount storage by default */
+#ifndef CONFIG_SYS_BOOTCOUNT_ADDR
+# define CONFIG_SYS_BOOTCOUNT_ADDR EVT0
+#endif
+
+#define MAGIC_MASK 0xffff0000
+#define COUNT_MASK 0x0000ffff
+
+void bootcount_store(ulong cnt)
+{
+       ulong magic = (BOOTCOUNT_MAGIC & MAGIC_MASK) | (cnt & COUNT_MASK);
+       bfin_write32(CONFIG_SYS_BOOTCOUNT_ADDR, magic);
+}
+
+ulong bootcount_load(void)
+{
+       ulong magic = bfin_read32(CONFIG_SYS_BOOTCOUNT_ADDR);
+       if ((magic & MAGIC_MASK) == (BOOTCOUNT_MAGIC & MAGIC_MASK))
+               return magic & COUNT_MASK;
+       else
+               return 0;
+}