1 files changed, 123 insertions, 0 deletions

diff --git a/arch/microblaze/include/asm/atomic.h b/arch/microblaze/include/asm/atomic.h
new file mode 100644
index 000000000000..a448d94ab721
--- /dev/null
+++ b/arch/microblaze/include/asm/atomic.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_ATOMIC_H
+#define _ASM_MICROBLAZE_ATOMIC_H
+
+#include <linux/types.h>
+#include <linux/compiler.h> /* likely */
+#include <asm/system.h> /* local_irq_XXX and friends */
+
+#define ATOMIC_INIT(i)          { (i) }
+#define atomic_read(v)          ((v)->counter)
+#define atomic_set(v, i)        (((v)->counter) = (i))
+
+#define atomic_inc(v)           (atomic_add_return(1, (v)))
+#define atomic_dec(v)           (atomic_sub_return(1, (v)))
+
+#define atomic_add(i, v)        (atomic_add_return(i, (v)))
+#define atomic_sub(i, v)        (atomic_sub_return(i, (v)))
+
+#define atomic_inc_return(v)    (atomic_add_return(1, (v)))
+#define atomic_dec_return(v)    (atomic_sub_return(1, (v)))
+
+#define atomic_inc_and_test(v)  (atomic_add_return(1, (v)) == 0)
+#define atomic_dec_and_test(v)  (atomic_sub_return(1, (v)) == 0)
+
+#define atomic_inc_not_zero(v)  (atomic_add_unless((v), 1, 0))
+
+#define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0)
+
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+        int ret;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        ret = v->counter;
+        if (likely(ret == old))
+                v->counter = new;
+        local_irq_restore(flags);
+
+        return ret;
+}
+
+static inline int atomic_add_unless(atomic_t *v, int a, int u)
+{
+        int c, old;
+
+        c = atomic_read(v);
+        while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
+                c = old;
+        return c != u;
+}
+
+static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        *addr &= ~mask;
+        local_irq_restore(flags);
+}
+
+/**
+ * atomic_add_return - add and return
+ * @i: integer value to add
+ * @v: pointer of type atomic_t
+ *
+ * Atomically adds @i to @v and returns @i + @v
+ */
+static inline int atomic_add_return(int i, atomic_t *v)
+{
+        unsigned long flags;
+        int val;
+
+        local_irq_save(flags);
+        val = v->counter;
+        v->counter = val += i;
+        local_irq_restore(flags);
+
+        return val;
+}
+
+static inline int atomic_sub_return(int i, atomic_t *v)
+{
+        return atomic_add_return(-i, v);
+}
+
+/*
+ * Atomically test *v and decrement if it is greater than 0.
+ * The function returns the old value of *v minus 1.
+ */
+static inline int atomic_dec_if_positive(atomic_t *v)
+{
+        unsigned long flags;
+        int res;
+
+        local_irq_save(flags);
+        res = v->counter - 1;
+        if (res >= 0)
+                v->counter = res;
+        local_irq_restore(flags);
+
+        return res;
+}
+
+#define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+/* Atomic operations are already serializing */
+#define smp_mb__before_atomic_dec()     barrier()
+#define smp_mb__after_atomic_dec()      barrier()
+#define smp_mb__before_atomic_inc()     barrier()
+#define smp_mb__after_atomic_inc()      barrier()
+
+#include <asm-generic/atomic.h>
+
+#endif /* _ASM_MICROBLAZE_ATOMIC_H */