#ifndef __ARCH_BLACKFIN_ATOMIC__ #define __ARCH_BLACKFIN_ATOMIC__ #include <asm/system.h> /* local_irq_XXX() */ /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. * * Generally we do not concern about SMP BFIN systems, so we don't have * to deal with that. * * Tony Kou (tonyko@lineo.ca) Lineo Inc. 2001 */ typedef struct { int counter; } atomic_t; #define ATOMIC_INIT(i) { (i) } #define atomic_read(v) ((v)->counter) #define atomic_set(v, i) (((v)->counter) = i) static __inline__ void atomic_add(int i, atomic_t * v) { long flags; local_irq_save(flags); v->counter += i; local_irq_restore(flags); } static __inline__ void atomic_sub(int i, atomic_t * v) { long flags; local_irq_save(flags); v->counter -= i; local_irq_restore(flags); } static inline int atomic_add_return(int i, atomic_t * v) { int __temp = 0; long flags; local_irq_save(flags); v->counter += i; __temp = v->counter; local_irq_restore(flags); return __temp; } #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) static inline int atomic_sub_return(int i, atomic_t * v) { int __temp = 0; long flags; local_irq_save(flags); v->counter -= i; __temp = v->counter; local_irq_restore(flags); return __temp; } static __inline__ void atomic_inc(volatile atomic_t * v) { long flags; local_irq_save(flags); v->counter++; local_irq_restore(flags); } #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) #define atomic_add_unless(v, a, u) \ ({ \ int c, old; \ c = atomic_read(v); \ while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ c = old; \ c != (u); \ }) #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) static __inline__ void atomic_dec(volatile atomic_t * v) { long flags; local_irq_save(flags); v->counter--; local_irq_restore(flags); } static __inline__ void atomic_clear_mask(unsigned int mask, atomic_t * v) { long flags; local_irq_save(flags); v->counter &= ~mask; local_irq_restore(flags); } static __inline__ void atomic_set_mask(unsigned int mask, atomic_t * v) { long flags; local_irq_save(flags); v->counter |= mask; local_irq_restore(flags); } /* Atomic operations are already serializing */ #define smp_mb__before_atomic_dec() barrier() #define smp_mb__after_atomic_dec() barrier() #define smp_mb__before_atomic_inc() barrier() #define smp_mb__after_atomic_inc() barrier() #define atomic_dec_return(v) atomic_sub_return(1,(v)) #define atomic_inc_return(v) atomic_add_return(1,(v)) /* * atomic_inc_and_test - increment and test * @v: pointer of type atomic_t * * Atomically increments @v by 1 * and returns true if the result is zero, or false for all * other cases. */ #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) #include <asm-generic/atomic.h> #endif /* __ARCH_BLACKFIN_ATOMIC __ */