2 * Copyright 2004-2009 Analog Devices Inc.
4 * Licensed under the GPL-2 or later.
7 #ifndef __ARCH_BLACKFIN_ATOMIC__
8 #define __ARCH_BLACKFIN_ATOMIC__
11 # include <asm-generic/atomic.h>
14 #include <linux/types.h>
15 #include <asm/system.h> /* local_irq_XXX() */
18 * Atomic operations that C can't guarantee us. Useful for
19 * resource counting etc..
22 #define ATOMIC_INIT(i) { (i) }
23 #define atomic_set(v, i) (((v)->counter) = i)
25 #define atomic_read(v) __raw_uncached_fetch_asm(&(v)->counter)
27 asmlinkage int __raw_uncached_fetch_asm(const volatile int *ptr);
29 asmlinkage int __raw_atomic_update_asm(volatile int *ptr, int value);
31 asmlinkage int __raw_atomic_clear_asm(volatile int *ptr, int value);
33 asmlinkage int __raw_atomic_set_asm(volatile int *ptr, int value);
35 asmlinkage int __raw_atomic_xor_asm(volatile int *ptr, int value);
37 asmlinkage int __raw_atomic_test_asm(const volatile int *ptr, int value);
39 static inline void atomic_add(int i, atomic_t *v)
41 __raw_atomic_update_asm(&v->counter, i);
44 static inline void atomic_sub(int i, atomic_t *v)
46 __raw_atomic_update_asm(&v->counter, -i);
49 static inline int atomic_add_return(int i, atomic_t *v)
51 return __raw_atomic_update_asm(&v->counter, i);
54 static inline int atomic_sub_return(int i, atomic_t *v)
56 return __raw_atomic_update_asm(&v->counter, -i);
59 static inline void atomic_inc(volatile atomic_t *v)
61 __raw_atomic_update_asm(&v->counter, 1);
64 static inline void atomic_dec(volatile atomic_t *v)
66 __raw_atomic_update_asm(&v->counter, -1);
69 static inline void atomic_clear_mask(int mask, atomic_t *v)
71 __raw_atomic_clear_asm(&v->counter, mask);
74 static inline void atomic_set_mask(int mask, atomic_t *v)
76 __raw_atomic_set_asm(&v->counter, mask);
79 static inline int atomic_test_mask(int mask, atomic_t *v)
81 return __raw_atomic_test_asm(&v->counter, mask);
84 /* Atomic operations are already serializing */
85 #define smp_mb__before_atomic_dec() barrier()
86 #define smp_mb__after_atomic_dec() barrier()
87 #define smp_mb__before_atomic_inc() barrier()
88 #define smp_mb__after_atomic_inc() barrier()
90 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
91 #define atomic_dec_return(v) atomic_sub_return(1,(v))
92 #define atomic_inc_return(v) atomic_add_return(1,(v))
94 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
95 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
97 #define atomic_add_unless(v, a, u) \
100 c = atomic_read(v); \
101 while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
105 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
108 * atomic_inc_and_test - increment and test
109 * @v: pointer of type atomic_t
111 * Atomically increments @v by 1
112 * and returns true if the result is zero, or false for all
115 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
117 #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
118 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
120 #include <asm-generic/atomic-long.h>