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-rw-r--r--arch/blackfin/include/asm/barrier.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/barrier.h b/arch/blackfin/include/asm/barrier.h
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+++ b/arch/blackfin/include/asm/barrier.h
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+/*
+ * Copyright 2004-2009 Analog Devices Inc.
+ * Tony Kou (tonyko@lineo.ca)
+ *
+ * Licensed under the GPL-2 or later
+ */
+
+#ifndef _BLACKFIN_BARRIER_H
+#define _BLACKFIN_BARRIER_H
+
+#include <asm/cache.h>
+
+#define nop() __asm__ __volatile__ ("nop;\n\t" : : )
+
+/*
+ * Force strict CPU ordering.
+ */
+#ifdef CONFIG_SMP
+
+#ifdef __ARCH_SYNC_CORE_DCACHE
+/* Force Core data cache coherence */
+# define mb() do { barrier(); smp_check_barrier(); smp_mark_barrier(); } while (0)
+# define rmb() do { barrier(); smp_check_barrier(); } while (0)
+# define wmb() do { barrier(); smp_mark_barrier(); } while (0)
+# define read_barrier_depends() do { barrier(); smp_check_barrier(); } while (0)
+#else
+# define mb() barrier()
+# define rmb() barrier()
+# define wmb() barrier()
+# define read_barrier_depends() do { } while (0)
+#endif
+
+#else /* !CONFIG_SMP */
+
+#define mb() barrier()
+#define rmb() barrier()
+#define wmb() barrier()
+#define read_barrier_depends() do { } while (0)
+
+#endif /* !CONFIG_SMP */
+
+#define smp_mb() mb()
+#define smp_rmb() rmb()
+#define smp_wmb() wmb()
+#define set_mb(var, value) do { var = value; mb(); } while (0)
+#define smp_read_barrier_depends() read_barrier_depends()
+
+#endif /* _BLACKFIN_BARRIER_H */