1 files changed, 144 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/atomic.h b/arch/blackfin/include/asm/atomic.h
new file mode 100644
index 000000000000..7cf508718605
--- /dev/null
+++ b/arch/blackfin/include/asm/atomic.h
@@ -0,0 +1,144 @@
+#ifndef __ARCH_BLACKFIN_ATOMIC__
+#define __ARCH_BLACKFIN_ATOMIC__
+
+#include <asm/system.h> /* local_irq_XXX() */
+
+/*
+ * Atomic operations that C can't guarantee us.  Useful for
+ * resource counting etc..
+ *
+ * Generally we do not concern about SMP BFIN systems, so we don't have
+ * to deal with that.
+ *
+ * Tony Kou (tonyko@lineo.ca)   Lineo Inc.   2001
+ */
+
+typedef struct {
+        int counter;
+} atomic_t;
+#define ATOMIC_INIT(i)  { (i) }
+
+#define atomic_read(v)          ((v)->counter)
+#define atomic_set(v, i)        (((v)->counter) = i)
+
+static __inline__ void atomic_add(int i, atomic_t * v)
+{
+        long flags;
+
+        local_irq_save(flags);
+        v->counter += i;
+        local_irq_restore(flags);
+}
+
+static __inline__ void atomic_sub(int i, atomic_t * v)
+{
+        long flags;
+
+        local_irq_save(flags);
+        v->counter -= i;
+        local_irq_restore(flags);
+
+}
+
+static inline int atomic_add_return(int i, atomic_t * v)
+{
+        int __temp = 0;
+        long flags;
+
+        local_irq_save(flags);
+        v->counter += i;
+        __temp = v->counter;
+        local_irq_restore(flags);
+
+
+        return __temp;
+}
+
+#define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
+static inline int atomic_sub_return(int i, atomic_t * v)
+{
+        int __temp = 0;
+        long flags;
+
+        local_irq_save(flags);
+        v->counter -= i;
+        __temp = v->counter;
+        local_irq_restore(flags);
+
+        return __temp;
+}
+
+static __inline__ void atomic_inc(volatile atomic_t * v)
+{
+        long flags;
+
+        local_irq_save(flags);
+        v->counter++;
+        local_irq_restore(flags);
+}
+
+#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+#define atomic_add_unless(v, a, u)                              \
+({                                                              \
+        int c, old;                                             \
+        c = atomic_read(v);                                     \
+        while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
+                c = old;                                        \
+        c != (u);                                               \
+})
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+
+static __inline__ void atomic_dec(volatile atomic_t * v)
+{
+        long flags;
+
+        local_irq_save(flags);
+        v->counter--;
+        local_irq_restore(flags);
+}
+
+static __inline__ void atomic_clear_mask(unsigned int mask, atomic_t * v)
+{
+        long flags;
+
+        local_irq_save(flags);
+        v->counter &= ~mask;
+        local_irq_restore(flags);
+}
+
+static __inline__ void atomic_set_mask(unsigned int mask, atomic_t * v)
+{
+        long flags;
+
+        local_irq_save(flags);
+        v->counter |= mask;
+        local_irq_restore(flags);
+}
+
+/* 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()
+
+#define atomic_dec_return(v) atomic_sub_return(1,(v))
+#define atomic_inc_return(v) atomic_add_return(1,(v))
+
+/*
+ * atomic_inc_and_test - increment and test
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1
+ * and returns true if the result is zero, or false for all
+ * other cases.
+ */
+#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
+
+#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
+#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
+
+#include <asm-generic/atomic.h>
+
+#endif                          /* __ARCH_BLACKFIN_ATOMIC __ */