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authorStefan Roese <sr@denx.de>2012-08-16 17:55:41 +0000
committerWolfgang Denk <wd@denx.de>2012-09-01 14:26:02 +0200
commit0044c42e94ecc258728190919b4619508fb83089 (patch)
tree4964b48f60ad93a2b77a76104b0ca9f664bde3b3 /drivers/bootcount/bootcount_blackfin.c
parent7fe7701d322e9147c06d68ad6ebef91289b9a57e (diff)
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Consolidate bootcount code into drivers/bootcount
This patch moves all bootcount implementations into a common directory: drivers/bootcount. The generic bootcount driver is now usable not only by powerpc platforms, but others as well. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Heiko Schocher <hs@denx.de> Cc: Valentin Longchamp <valentin.longchamp@keymile.com> Cc: Christian Riesch <christian.riesch@omicron.at> Cc: Manfred Rudigier <manfred.rudigier@omicron.at> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Reinhard Meyer <reinhard.meyer@emk-elektronik.de> Tested-by: Valentin Longchamp <valentin.longchamp@keymile.com> Tested-by: Christian Riesch <christian.riesch@omicron.at> Acked-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'drivers/bootcount/bootcount_blackfin.c')
-rw-r--r--drivers/bootcount/bootcount_blackfin.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/bootcount/bootcount_blackfin.c b/drivers/bootcount/bootcount_blackfin.c
new file mode 100644
index 0000000..6cf6dd5
--- /dev/null
+++ b/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;
+}