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authorMike Frysinger <vapier@gentoo.org>2010-04-29 01:34:57 -0400
committerMike Frysinger <vapier@gentoo.org>2010-07-05 04:18:18 -0400
commita5384ae49a52e2d4744aed20d729ccf20e7a907a (patch)
tree92e7f90207776496873152932497e90d47631ab5 /arch/blackfin/cpu
parent66a4909a3d4d684f7a102f4d4d2ba8ae8c66d786 (diff)
downloadu-boot-linaro-stable-a5384ae49a52e2d4744aed20d729ccf20e7a907a.tar.gz
Blackfin: implement bootcount support
The default storage location for bootcount is EVT0. This version uses one 32bit value and combines the magic/count value in the upper/lower 16bits. If there is demand for more, should be easy to do. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/cpu')
-rw-r--r--arch/blackfin/cpu/Makefile1
-rw-r--r--arch/blackfin/cpu/bootcount.c34
2 files changed, 35 insertions, 0 deletions
diff --git a/arch/blackfin/cpu/Makefile b/arch/blackfin/cpu/Makefile
index 211b8d545..50c1eeab9 100644
--- a/arch/blackfin/cpu/Makefile
+++ b/arch/blackfin/cpu/Makefile
@@ -17,6 +17,7 @@ EXTRA :=
CEXTRA := initcode.o
SEXTRA := start.o
SOBJS := interrupt.o cache.o
+COBJS-$(CONFIG_BOOTCOUNT_LIMIT) += bootcount.o
COBJS-y += cpu.o
COBJS-y += interrupts.o
COBJS-$(CONFIG_JTAG_CONSOLE) += jtag-console.o
diff --git a/arch/blackfin/cpu/bootcount.c b/arch/blackfin/cpu/bootcount.c
new file mode 100644
index 000000000..6cf6dd58b
--- /dev/null
+++ b/arch/blackfin/cpu/bootcount.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;
+}