Blackfin arch: move include/asm-blackfin header files to arch/blackfin
[linux-2.6.git] / arch / blackfin / include / asm / atomic.h
1 #ifndef __ARCH_BLACKFIN_ATOMIC__
2 #define __ARCH_BLACKFIN_ATOMIC__
3
4 #include <asm/system.h> /* local_irq_XXX() */
5
6 /*
7  * Atomic operations that C can't guarantee us.  Useful for
8  * resource counting etc..
9  *
10  * Generally we do not concern about SMP BFIN systems, so we don't have
11  * to deal with that.
12  *
13  * Tony Kou (tonyko@lineo.ca)   Lineo Inc.   2001
14  */
15
16 typedef struct {
17         int counter;
18 } atomic_t;
19 #define ATOMIC_INIT(i)  { (i) }
20
21 #define atomic_read(v)          ((v)->counter)
22 #define atomic_set(v, i)        (((v)->counter) = i)
23
24 static __inline__ void atomic_add(int i, atomic_t * v)
25 {
26         long flags;
27
28         local_irq_save(flags);
29         v->counter += i;
30         local_irq_restore(flags);
31 }
32
33 static __inline__ void atomic_sub(int i, atomic_t * v)
34 {
35         long flags;
36
37         local_irq_save(flags);
38         v->counter -= i;
39         local_irq_restore(flags);
40
41 }
42
43 static inline int atomic_add_return(int i, atomic_t * v)
44 {
45         int __temp = 0;
46         long flags;
47
48         local_irq_save(flags);
49         v->counter += i;
50         __temp = v->counter;
51         local_irq_restore(flags);
52
53
54         return __temp;
55 }
56
57 #define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
58 static inline int atomic_sub_return(int i, atomic_t * v)
59 {
60         int __temp = 0;
61         long flags;
62
63         local_irq_save(flags);
64         v->counter -= i;
65         __temp = v->counter;
66         local_irq_restore(flags);
67
68         return __temp;
69 }
70
71 static __inline__ void atomic_inc(volatile atomic_t * v)
72 {
73         long flags;
74
75         local_irq_save(flags);
76         v->counter++;
77         local_irq_restore(flags);
78 }
79
80 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
81 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
82
83 #define atomic_add_unless(v, a, u)                              \
84 ({                                                              \
85         int c, old;                                             \
86         c = atomic_read(v);                                     \
87         while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
88                 c = old;                                        \
89         c != (u);                                               \
90 })
91 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
92
93 static __inline__ void atomic_dec(volatile atomic_t * v)
94 {
95         long flags;
96
97         local_irq_save(flags);
98         v->counter--;
99         local_irq_restore(flags);
100 }
101
102 static __inline__ void atomic_clear_mask(unsigned int mask, atomic_t * v)
103 {
104         long flags;
105
106         local_irq_save(flags);
107         v->counter &= ~mask;
108         local_irq_restore(flags);
109 }
110
111 static __inline__ void atomic_set_mask(unsigned int mask, atomic_t * v)
112 {
113         long flags;
114
115         local_irq_save(flags);
116         v->counter |= mask;
117         local_irq_restore(flags);
118 }
119
120 /* Atomic operations are already serializing */
121 #define smp_mb__before_atomic_dec()    barrier()
122 #define smp_mb__after_atomic_dec() barrier()
123 #define smp_mb__before_atomic_inc()    barrier()
124 #define smp_mb__after_atomic_inc() barrier()
125
126 #define atomic_dec_return(v) atomic_sub_return(1,(v))
127 #define atomic_inc_return(v) atomic_add_return(1,(v))
128
129 /*
130  * atomic_inc_and_test - increment and test
131  * @v: pointer of type atomic_t
132  *
133  * Atomically increments @v by 1
134  * and returns true if the result is zero, or false for all
135  * other cases.
136  */
137 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
138
139 #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
140 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
141
142 #include <asm-generic/atomic.h>
143
144 #endif                          /* __ARCH_BLACKFIN_ATOMIC __ */