[linux-2.6-block.git] / arch / h8300 / include / asm / atomic.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ARCH_H8300_ATOMIC__
#define __ARCH_H8300_ATOMIC__

#include <linux/types.h>
#include <asm/cmpxchg.h>

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 */

#define ATOMIC_INIT(i)	{ (i) }

#define atomic_read(v)		READ_ONCE((v)->counter)
#define atomic_set(v, i)	WRITE_ONCE(((v)->counter), (i))

#include <linux/kernel.h>

#define ATOMIC_OP_RETURN(op, c_op)				\
static inline int atomic_##op##_return(int i, atomic_t *v)	\
{								\
	h8300flags flags;					\
	int ret;						\
								\
	flags = arch_local_irq_save();				\
	ret = v->counter c_op i;				\
	arch_local_irq_restore(flags);				\
	return ret;						\
}

#define ATOMIC_FETCH_OP(op, c_op)				\
static inline int atomic_fetch_##op(int i, atomic_t *v)		\
{								\
	h8300flags flags;					\
	int ret;						\
								\
	flags = arch_local_irq_save();				\
	ret = v->counter;					\
	v->counter c_op i;					\
	arch_local_irq_restore(flags);				\
	return ret;						\
}

#define ATOMIC_OP(op, c_op)					\
static inline void atomic_##op(int i, atomic_t *v)		\
{								\
	h8300flags flags;					\
								\
	flags = arch_local_irq_save();				\
	v->counter c_op i;					\
	arch_local_irq_restore(flags);				\
}

ATOMIC_OP_RETURN(add, +=)
ATOMIC_OP_RETURN(sub, -=)

#define ATOMIC_OPS(op, c_op)					\
	ATOMIC_OP(op, c_op)					\
	ATOMIC_FETCH_OP(op, c_op)

ATOMIC_OPS(and, &=)
ATOMIC_OPS(or,  |=)
ATOMIC_OPS(xor, ^=)
ATOMIC_OPS(add, +=)
ATOMIC_OPS(sub, -=)

#undef ATOMIC_OPS
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP

#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
#define atomic_sub_and_test(i, v)	(atomic_sub_return(i, v) == 0)

#define atomic_inc_return(v)		atomic_add_return(1, v)
#define atomic_dec_return(v)		atomic_sub_return(1, v)

#define atomic_inc(v)			(void)atomic_inc_return(v)
#define atomic_inc_and_test(v)		(atomic_inc_return(v) == 0)

#define atomic_dec(v)			(void)atomic_dec_return(v)
#define atomic_dec_and_test(v)		(atomic_dec_return(v) == 0)

static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
	int ret;
	h8300flags flags;

	flags = arch_local_irq_save();
	ret = v->counter;
	if (likely(ret == old))
		v->counter = new;
	arch_local_irq_restore(flags);
	return ret;
}

static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
	int ret;
	h8300flags flags;

	flags = arch_local_irq_save();
	ret = v->counter;
	if (ret != u)
		v->counter += a;
	arch_local_irq_restore(flags);
	return ret;
}

#endif /* __ARCH_H8300_ATOMIC __ */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
d2a5f499 YS	2	#ifndef __ARCH_H8300_ATOMIC__
	3	#define __ARCH_H8300_ATOMIC__
	4
	5	#include <linux/types.h>
	6	#include <asm/cmpxchg.h>
	7
	8	/*
	9	* Atomic operations that C can't guarantee us. Useful for
	10	* resource counting etc..
	11	*/
	12
	13	#define ATOMIC_INIT(i) { (i) }
	14
62e8a325 PZ	15	#define atomic_read(v) READ_ONCE((v)->counter)
62e8a325 PZ	16	#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
d2a5f499 YS	17
	18	#include <linux/kernel.h>
	19
73ada370 PZ	20	#define ATOMIC_OP_RETURN(op, c_op) \
	21	static inline int atomic_##op##_return(int i, atomic_t *v) \
	22	{ \
	23	h8300flags flags; \
	24	int ret; \
	25	\
	26	flags = arch_local_irq_save(); \
	27	ret = v->counter c_op i; \
	28	arch_local_irq_restore(flags); \
	29	return ret; \
d2a5f499 YS	30	}
d2a5f499 YS	31
0c074cbc PZ	32	#define ATOMIC_FETCH_OP(op, c_op) \
	33	static inline int atomic_fetch_##op(int i, atomic_t *v) \
	34	{ \
	35	h8300flags flags; \
	36	int ret; \
	37	\
	38	flags = arch_local_irq_save(); \
	39	ret = v->counter; \
	40	v->counter c_op i; \
	41	arch_local_irq_restore(flags); \
	42	return ret; \
	43	}
	44
73ada370 PZ	45	#define ATOMIC_OP(op, c_op) \
	46	static inline void atomic_##op(int i, atomic_t *v) \
	47	{ \
	48	h8300flags flags; \
	49	\
	50	flags = arch_local_irq_save(); \
	51	v->counter c_op i; \
	52	arch_local_irq_restore(flags); \
d2a5f499 YS	53	}
d2a5f499 YS	54
73ada370 PZ	55	ATOMIC_OP_RETURN(add, +=)
73ada370 PZ	56	ATOMIC_OP_RETURN(sub, -=)
d2a5f499	57
0c074cbc PZ	58	#define ATOMIC_OPS(op, c_op) \
	59	ATOMIC_OP(op, c_op) \
	60	ATOMIC_FETCH_OP(op, c_op)
	61
	62	ATOMIC_OPS(and, &=)
	63	ATOMIC_OPS(or, \|=)
	64	ATOMIC_OPS(xor, ^=)
	65	ATOMIC_OPS(add, +=)
	66	ATOMIC_OPS(sub, -=)
	67
	68	#undef ATOMIC_OPS
73ada370 PZ	69	#undef ATOMIC_OP_RETURN
73ada370 PZ	70	#undef ATOMIC_OP
d2a5f499	71
73ada370	72	#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
73ada370	73	#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
d2a5f499	74
73ada370 PZ	75	#define atomic_inc_return(v) atomic_add_return(1, v)
73ada370 PZ	76	#define atomic_dec_return(v) atomic_sub_return(1, v)
d2a5f499	77
73ada370 PZ	78	#define atomic_inc(v) (void)atomic_inc_return(v)
73ada370 PZ	79	#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
d2a5f499	80
73ada370 PZ	81	#define atomic_dec(v) (void)atomic_dec_return(v)
73ada370 PZ	82	#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
d2a5f499 YS	83
	84	static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
	85	{
	86	int ret;
	87	h8300flags flags;
	88
	89	flags = arch_local_irq_save();
	90	ret = v->counter;
	91	if (likely(ret == old))
	92	v->counter = new;
	93	arch_local_irq_restore(flags);
	94	return ret;
	95	}
	96
	97	static inline int __atomic_add_unless(atomic_t *v, int a, int u)
	98	{
	99	int ret;
	100	h8300flags flags;
	101
	102	flags = arch_local_irq_save();
	103	ret = v->counter;
	104	if (ret != u)
	105	v->counter += a;
	106	arch_local_irq_restore(flags);
	107	return ret;
	108	}
	109
d2a5f499	110	#endif /* __ARCH_H8300_ATOMIC __ */