projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 __ */ |