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1394f032 BW |
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 __ */ |