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_OP(op, c_op)                                     \
  32 static inline void atomic_##op(int i, atomic_t *v)              \
  33 {                                                               \
  34         h8300flags flags;                                       \
  35                                                                 \
  36         flags = arch_local_irq_save();                          \
  37         v->counter c_op i;                                      \
  38         arch_local_irq_restore(flags);                          \
  39 }
  40
  41 ATOMIC_OP_RETURN(add, +=)
  42 ATOMIC_OP_RETURN(sub, -=)
  43
  44 ATOMIC_OP(and, &=)
  45 ATOMIC_OP(or,  |=)
  46 ATOMIC_OP(xor, ^=)
  47
  48 #undef ATOMIC_OP_RETURN
  49 #undef ATOMIC_OP
  50
  51 #define atomic_add(i, v)                (void)atomic_add_return(i, v)
  52 #define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
  53
  54 #define atomic_sub(i, v)                (void)atomic_sub_return(i, v)
  55 #define atomic_sub_and_test(i, v)       (atomic_sub_return(i, v) == 0)
  56
  57 #define atomic_inc_return(v)            atomic_add_return(1, v)
  58 #define atomic_dec_return(v)            atomic_sub_return(1, v)
  59
  60 #define atomic_inc(v)                   (void)atomic_inc_return(v)
  61 #define atomic_inc_and_test(v)          (atomic_inc_return(v) == 0)
  62
  63 #define atomic_dec(v)                   (void)atomic_dec_return(v)
  64 #define atomic_dec_and_test(v)          (atomic_dec_return(v) == 0)
  65
  66 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
  67 {
  68         int ret;
  69         h8300flags flags;
  70
  71         flags = arch_local_irq_save();
  72         ret = v->counter;
  73         if (likely(ret == old))
  74                 v->counter = new;
  75         arch_local_irq_restore(flags);
  76         return ret;
  77 }
  78
  79 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
  80 {
  81         int ret;
  82         h8300flags flags;
  83
  84         flags = arch_local_irq_save();
  85         ret = v->counter;
  86         if (ret != u)
  87                 v->counter += a;
  88         arch_local_irq_restore(flags);
  89         return ret;
  90 }
  91
  92 #endif /* __ARCH_H8300_ATOMIC __ */