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1 | #ifndef __ARCH_BLACKFIN_ATOMIC__ |
2 | #define __ARCH_BLACKFIN_ATOMIC__ | |
3 | ||
ea435467 | 4 | #include <linux/types.h> |
1394f032 BW |
5 | #include <asm/system.h> /* local_irq_XXX() */ |
6 | ||
7 | /* | |
8 | * Atomic operations that C can't guarantee us. Useful for | |
9 | * resource counting etc.. | |
10 | * | |
11 | * Generally we do not concern about SMP BFIN systems, so we don't have | |
12 | * to deal with that. | |
13 | * | |
14 | * Tony Kou (tonyko@lineo.ca) Lineo Inc. 2001 | |
15 | */ | |
16 | ||
1394f032 BW |
17 | #define ATOMIC_INIT(i) { (i) } |
18 | ||
19 | #define atomic_read(v) ((v)->counter) | |
20 | #define atomic_set(v, i) (((v)->counter) = i) | |
21 | ||
22 | static __inline__ void atomic_add(int i, atomic_t * v) | |
23 | { | |
24 | long flags; | |
25 | ||
26 | local_irq_save(flags); | |
27 | v->counter += i; | |
28 | local_irq_restore(flags); | |
29 | } | |
30 | ||
31 | static __inline__ void atomic_sub(int i, atomic_t * v) | |
32 | { | |
33 | long flags; | |
34 | ||
35 | local_irq_save(flags); | |
36 | v->counter -= i; | |
37 | local_irq_restore(flags); | |
38 | ||
39 | } | |
40 | ||
41 | static inline int atomic_add_return(int i, atomic_t * v) | |
42 | { | |
43 | int __temp = 0; | |
44 | long flags; | |
45 | ||
46 | local_irq_save(flags); | |
47 | v->counter += i; | |
48 | __temp = v->counter; | |
49 | local_irq_restore(flags); | |
50 | ||
51 | ||
52 | return __temp; | |
53 | } | |
54 | ||
55 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) | |
56 | static inline int atomic_sub_return(int i, atomic_t * v) | |
57 | { | |
58 | int __temp = 0; | |
59 | long flags; | |
60 | ||
61 | local_irq_save(flags); | |
62 | v->counter -= i; | |
63 | __temp = v->counter; | |
64 | local_irq_restore(flags); | |
65 | ||
66 | return __temp; | |
67 | } | |
68 | ||
69 | static __inline__ void atomic_inc(volatile atomic_t * v) | |
70 | { | |
71 | long flags; | |
72 | ||
73 | local_irq_save(flags); | |
74 | v->counter++; | |
75 | local_irq_restore(flags); | |
76 | } | |
77 | ||
78 | #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) | |
79 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) | |
80 | ||
81 | #define atomic_add_unless(v, a, u) \ | |
82 | ({ \ | |
83 | int c, old; \ | |
84 | c = atomic_read(v); \ | |
85 | while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ | |
86 | c = old; \ | |
87 | c != (u); \ | |
88 | }) | |
89 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | |
90 | ||
91 | static __inline__ void atomic_dec(volatile atomic_t * v) | |
92 | { | |
93 | long flags; | |
94 | ||
95 | local_irq_save(flags); | |
96 | v->counter--; | |
97 | local_irq_restore(flags); | |
98 | } | |
99 | ||
100 | static __inline__ void atomic_clear_mask(unsigned int mask, atomic_t * v) | |
101 | { | |
102 | long flags; | |
103 | ||
104 | local_irq_save(flags); | |
105 | v->counter &= ~mask; | |
106 | local_irq_restore(flags); | |
107 | } | |
108 | ||
109 | static __inline__ void atomic_set_mask(unsigned int mask, atomic_t * v) | |
110 | { | |
111 | long flags; | |
112 | ||
113 | local_irq_save(flags); | |
114 | v->counter |= mask; | |
115 | local_irq_restore(flags); | |
116 | } | |
117 | ||
118 | /* Atomic operations are already serializing */ | |
119 | #define smp_mb__before_atomic_dec() barrier() | |
120 | #define smp_mb__after_atomic_dec() barrier() | |
121 | #define smp_mb__before_atomic_inc() barrier() | |
122 | #define smp_mb__after_atomic_inc() barrier() | |
123 | ||
124 | #define atomic_dec_return(v) atomic_sub_return(1,(v)) | |
125 | #define atomic_inc_return(v) atomic_add_return(1,(v)) | |
126 | ||
127 | /* | |
128 | * atomic_inc_and_test - increment and test | |
129 | * @v: pointer of type atomic_t | |
130 | * | |
131 | * Atomically increments @v by 1 | |
132 | * and returns true if the result is zero, or false for all | |
133 | * other cases. | |
134 | */ | |
135 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
136 | ||
137 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) | |
138 | #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) | |
139 | ||
140 | #include <asm-generic/atomic.h> | |
141 | ||
142 | #endif /* __ARCH_BLACKFIN_ATOMIC __ */ |