arch/h8300/include/asm/atomic.h

   1 #ifndef __ARCH_H8300_ATOMIC__
   2 #define __ARCH_H8300_ATOMIC__
   3
   4 #include <linux/types.h>
   5 #include <asm/cmpxchg.h>
   6
   7 /*
   8  * Atomic operations that C can't guarantee us.  Useful for
   9  * resource counting etc..
  10  */
  11
  12 #define ATOMIC_INIT(i)  { (i) }
  13
  14 #define atomic_read(v)          READ_ONCE((v)->counter)
  15 #define atomic_set(v, i)        WRITE_ONCE(((v)->counter), (i))
  16
  17 #include <linux/kernel.h>
  18
  19 #define ATOMIC_OP_RETURN(op, c_op)                              \
  20 static inline int atomic_##op##_return(int i, atomic_t *v)      \
  21 {                                                               \
  22         h8300flags flags;                                       \
  23         int ret;                                                \
  24                                                                 \
  25         flags = arch_local_irq_save();                          \
  26         ret = v->counter c_op i;                                \
  27         arch_local_irq_restore(flags);                          \
  28         return ret;                                             \
  29 }
  30
  31 #define ATOMIC_FETCH_OP(op, c_op)                               \
  32 static inline int atomic_fetch_##op(int i, atomic_t *v)         \
  33 {                                                               \
  34         h8300flags flags;                                       \
  35         int ret;                                                \
  36                                                                 \
  37         flags = arch_local_irq_save();                          \
  38         ret = v->counter;                                       \
  39         v->counter c_op i;                                      \
  40         arch_local_irq_restore(flags);                          \
  41         return ret;                                             \
  42 }
  43
  44 #define ATOMIC_OP(op, c_op)                                     \
  45 static inline void atomic_##op(int i, atomic_t *v)              \
  46 {                                                               \
  47         h8300flags flags;                                       \
  48                                                                 \
  49         flags = arch_local_irq_save();                          \
  50         v->counter c_op i;                                      \
  51         arch_local_irq_restore(flags);                          \
  52 }
  53
  54 ATOMIC_OP_RETURN(add, +=)
  55 ATOMIC_OP_RETURN(sub, -=)
  56
  57 #define ATOMIC_OPS(op, c_op)                                    \
  58         ATOMIC_OP(op, c_op)                                     \
  59         ATOMIC_FETCH_OP(op, c_op)
  60
  61 ATOMIC_OPS(and, &=)
  62 ATOMIC_OPS(or,  |=)
  63 ATOMIC_OPS(xor, ^=)
  64 ATOMIC_OPS(add, +=)
  65 ATOMIC_OPS(sub, -=)
  66
  67 #undef ATOMIC_OPS
  68 #undef ATOMIC_OP_RETURN
  69 #undef ATOMIC_OP
  70
  71 #define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
  72 #define atomic_sub_and_test(i, v)       (atomic_sub_return(i, v) == 0)
  73
  74 #define atomic_inc_return(v)            atomic_add_return(1, v)
  75 #define atomic_dec_return(v)            atomic_sub_return(1, v)
  76
  77 #define atomic_inc(v)                   (void)atomic_inc_return(v)
  78 #define atomic_inc_and_test(v)          (atomic_inc_return(v) == 0)
  79
  80 #define atomic_dec(v)                   (void)atomic_dec_return(v)
  81 #define atomic_dec_and_test(v)          (atomic_dec_return(v) == 0)
  82
  83 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
  84 {
  85         int ret;
  86         h8300flags flags;
  87
  88         flags = arch_local_irq_save();
  89         ret = v->counter;
  90         if (likely(ret == old))
  91                 v->counter = new;
  92         arch_local_irq_restore(flags);
  93         return ret;
  94 }
  95
  96 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
  97 {
  98         int ret;
  99         h8300flags flags;
 100
 101         flags = arch_local_irq_save();
 102         ret = v->counter;
 103         if (ret != u)
 104                 v->counter += a;
 105         arch_local_irq_restore(flags);
 106         return ret;
 107 }
 108
 109 #endif /* __ARCH_H8300_ATOMIC __ */