[deliverable/linux.git] / include / asm-m32r / atomic.h

#ifndef _ASM_M32R_ATOMIC_H
#define _ASM_M32R_ATOMIC_H

/*
 *  linux/include/asm-m32r/atomic.h
 *
 *  M32R version:
 *    Copyright (C) 2001, 2002  Hitoshi Yamamoto
 *    Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
 */

#include <asm/assembler.h>
#include <asm/system.h>

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

/*
 * Make sure gcc doesn't try to be clever and move things around
 * on us. We need to use _exactly_ the address the user gave us,
 * not some alias that contains the same information.
 */
typedef struct { volatile int counter; } atomic_t;

#define ATOMIC_INIT(i)	{ (i) }

/**
 * atomic_read - read atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically reads the value of @v.
 */
#define atomic_read(v)	((v)->counter)

/**
 * atomic_set - set atomic variable
 * @v: pointer of type atomic_t
 * @i: required value
 *
 * Atomically sets the value of @v to @i.
 */
#define atomic_set(v,i)	(((v)->counter) = (i))

/**
 * atomic_add_return - add integer to atomic variable and return it
 * @i: integer value to add
 * @v: pointer of type atomic_t
 *
 * Atomically adds @i to @v and return (@i + @v).
 */
static __inline__ int atomic_add_return(int i, atomic_t *v)
{
	unsigned long flags;
	int result;

	local_irq_save(flags);
	__asm__ __volatile__ (
		"# atomic_add_return		\n\t"
		DCACHE_CLEAR("%0", "r4", "%1")
		M32R_LOCK" %0, @%1;		\n\t"
		"add	%0, %2;			\n\t"
		M32R_UNLOCK" %0, @%1;		\n\t"
		: "=&r" (result)
		: "r" (&v->counter), "r" (i)
		: "memory"
#ifdef CONFIG_CHIP_M32700_TS1
		, "r4"
#endif	/* CONFIG_CHIP_M32700_TS1 */
	);
	local_irq_restore(flags);

	return result;
}

/**
 * atomic_sub_return - subtract integer from atomic variable and return it
 * @i: integer value to subtract
 * @v: pointer of type atomic_t
 *
 * Atomically subtracts @i from @v and return (@v - @i).
 */
static __inline__ int atomic_sub_return(int i, atomic_t *v)
{
	unsigned long flags;
	int result;

	local_irq_save(flags);
	__asm__ __volatile__ (
		"# atomic_sub_return		\n\t"
		DCACHE_CLEAR("%0", "r4", "%1")
		M32R_LOCK" %0, @%1;		\n\t"
		"sub	%0, %2;			\n\t"
		M32R_UNLOCK" %0, @%1;		\n\t"
		: "=&r" (result)
		: "r" (&v->counter), "r" (i)
		: "memory"
#ifdef CONFIG_CHIP_M32700_TS1
		, "r4"
#endif	/* CONFIG_CHIP_M32700_TS1 */
	);
	local_irq_restore(flags);

	return result;
}

/**
 * atomic_add - add integer to atomic variable
 * @i: integer value to add
 * @v: pointer of type atomic_t
 *
 * Atomically adds @i to @v.
 */
#define atomic_add(i,v) ((void) atomic_add_return((i), (v)))

/**
 * atomic_sub - subtract the atomic variable
 * @i: integer value to subtract
 * @v: pointer of type atomic_t
 *
 * Atomically subtracts @i from @v.
 */
#define atomic_sub(i,v) ((void) atomic_sub_return((i), (v)))

/**
 * atomic_sub_and_test - subtract value from variable and test result
 * @i: integer value to subtract
 * @v: pointer of type atomic_t
 *
 * Atomically subtracts @i from @v and returns
 * true if the result is zero, or false for all
 * other cases.
 */
#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)

/**
 * atomic_inc_return - increment atomic variable and return it
 * @v: pointer of type atomic_t
 *
 * Atomically increments @v by 1 and returns the result.
 */
static __inline__ int atomic_inc_return(atomic_t *v)
{
	unsigned long flags;
	int result;

	local_irq_save(flags);
	__asm__ __volatile__ (
		"# atomic_inc_return		\n\t"
		DCACHE_CLEAR("%0", "r4", "%1")
		M32R_LOCK" %0, @%1;		\n\t"
		"addi	%0, #1;			\n\t"
		M32R_UNLOCK" %0, @%1;		\n\t"
		: "=&r" (result)
		: "r" (&v->counter)
		: "memory"
#ifdef CONFIG_CHIP_M32700_TS1
		, "r4"
#endif	/* CONFIG_CHIP_M32700_TS1 */
	);
	local_irq_restore(flags);

	return result;
}

/**
 * atomic_dec_return - decrement atomic variable and return it
 * @v: pointer of type atomic_t
 *
 * Atomically decrements @v by 1 and returns the result.
 */
static __inline__ int atomic_dec_return(atomic_t *v)
{
	unsigned long flags;
	int result;

	local_irq_save(flags);
	__asm__ __volatile__ (
		"# atomic_dec_return		\n\t"
		DCACHE_CLEAR("%0", "r4", "%1")
		M32R_LOCK" %0, @%1;		\n\t"
		"addi	%0, #-1;		\n\t"
		M32R_UNLOCK" %0, @%1;		\n\t"
		: "=&r" (result)
		: "r" (&v->counter)
		: "memory"
#ifdef CONFIG_CHIP_M32700_TS1
		, "r4"
#endif	/* CONFIG_CHIP_M32700_TS1 */
	);
	local_irq_restore(flags);

	return result;
}

/**
 * atomic_inc - increment atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically increments @v by 1.
 */
#define atomic_inc(v) ((void)atomic_inc_return(v))

/**
 * atomic_dec - decrement atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically decrements @v by 1.
 */
#define atomic_dec(v) ((void)atomic_dec_return(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)

/**
 * atomic_dec_and_test - decrement and test
 * @v: pointer of type atomic_t
 *
 * Atomically decrements @v by 1 and
 * returns true if the result is 0, or false for all
 * other cases.
 */
#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)

/**
 * atomic_add_negative - add and test if negative
 * @v: pointer of type atomic_t
 * @i: integer value to add
 *
 * Atomically adds @i to @v and returns true
 * if the result is negative, or false when
 * result is greater than or equal to zero.
 */
#define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0)

#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))

/**
 * atomic_add_unless - add unless the number is a given value
 * @v: pointer of type atomic_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @v, so long as it was not @u.
 * Returns non-zero if @v was not @u, and zero otherwise.
 */
#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_clear_mask(unsigned long  mask, atomic_t *addr)
{
	unsigned long flags;
	unsigned long tmp;

	local_irq_save(flags);
	__asm__ __volatile__ (
		"# atomic_clear_mask		\n\t"
		DCACHE_CLEAR("%0", "r5", "%1")
		M32R_LOCK" %0, @%1;		\n\t"
		"and	%0, %2;			\n\t"
		M32R_UNLOCK" %0, @%1;		\n\t"
		: "=&r" (tmp)
		: "r" (addr), "r" (~mask)
		: "memory"
#ifdef CONFIG_CHIP_M32700_TS1
		, "r5"
#endif	/* CONFIG_CHIP_M32700_TS1 */
	);
	local_irq_restore(flags);
}

static __inline__ void atomic_set_mask(unsigned long  mask, atomic_t *addr)
{
	unsigned long flags;
	unsigned long tmp;

	local_irq_save(flags);
	__asm__ __volatile__ (
		"# atomic_set_mask		\n\t"
		DCACHE_CLEAR("%0", "r5", "%1")
		M32R_LOCK" %0, @%1;		\n\t"
		"or	%0, %2;			\n\t"
		M32R_UNLOCK" %0, @%1;		\n\t"
		: "=&r" (tmp)
		: "r" (addr), "r" (mask)
		: "memory"
#ifdef CONFIG_CHIP_M32700_TS1
		, "r5"
#endif	/* CONFIG_CHIP_M32700_TS1 */
	);
	local_irq_restore(flags);
}

/* Atomic operations are already serializing on m32r */
#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()

#include <asm-generic/atomic.h>
#endif	/* _ASM_M32R_ATOMIC_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_M32R_ATOMIC_H
	2	#define _ASM_M32R_ATOMIC_H
	3
	4	/*
	5	* linux/include/asm-m32r/atomic.h
	6	*
	7	* M32R version:
	8	* Copyright (C) 2001, 2002 Hitoshi Yamamoto
	9	* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
	10	*/
	11
1da177e4 LT	12	#include <asm/assembler.h>
	13	#include <asm/system.h>
	14
	15	/*
	16	* Atomic operations that C can't guarantee us. Useful for
	17	* resource counting etc..
	18	*/
	19
	20	/*
	21	* Make sure gcc doesn't try to be clever and move things around
	22	* on us. We need to use _exactly_ the address the user gave us,
	23	* not some alias that contains the same information.
	24	*/
	25	typedef struct { volatile int counter; } atomic_t;
	26
	27	#define ATOMIC_INIT(i) { (i) }
	28
	29	/**
	30	* atomic_read - read atomic variable
	31	* @v: pointer of type atomic_t
	32	*
	33	* Atomically reads the value of @v.
	34	*/
	35	#define atomic_read(v) ((v)->counter)
	36
	37	/**
	38	* atomic_set - set atomic variable
	39	* @v: pointer of type atomic_t
	40	* @i: required value
	41	*
	42	* Atomically sets the value of @v to @i.
	43	*/
	44	#define atomic_set(v,i) (((v)->counter) = (i))
	45
	46	/**
	47	* atomic_add_return - add integer to atomic variable and return it
	48	* @i: integer value to add
	49	* @v: pointer of type atomic_t
	50	*
	51	* Atomically adds @i to @v and return (@i + @v).
	52	*/
	53	static __inline__ int atomic_add_return(int i, atomic_t *v)
	54	{
	55	unsigned long flags;
	56	int result;
	57
	58	local_irq_save(flags);
	59	__asm__ __volatile__ (
	60	"# atomic_add_return \n\t"
	61	DCACHE_CLEAR("%0", "r4", "%1")
	62	M32R_LOCK" %0, @%1; \n\t"
	63	"add %0, %2; \n\t"
	64	M32R_UNLOCK" %0, @%1; \n\t"
	65	: "=&r" (result)
	66	: "r" (&v->counter), "r" (i)
	67	: "memory"
	68	#ifdef CONFIG_CHIP_M32700_TS1
	69	, "r4"
	70	#endif /* CONFIG_CHIP_M32700_TS1 */
	71	);
	72	local_irq_restore(flags);
	73
	74	return result;
	75	}
76
77	/**
78	* atomic_sub_return - subtract integer from atomic variable and return it
79	* @i: integer value to subtract
80	* @v: pointer of type atomic_t
81	*
82	* Atomically subtracts @i from @v and return (@v - @i).
83	*/
84	static __inline__ int atomic_sub_return(int i, atomic_t *v)
85	{
86	unsigned long flags;
87	int result;
88
89	local_irq_save(flags);
90	__asm__ __volatile__ (
91	"# atomic_sub_return \n\t"
92	DCACHE_CLEAR("%0", "r4", "%1")
93	M32R_LOCK" %0, @%1; \n\t"
94	"sub %0, %2; \n\t"
95	M32R_UNLOCK" %0, @%1; \n\t"
96	: "=&r" (result)
97	: "r" (&v->counter), "r" (i)
98	: "memory"
99	#ifdef CONFIG_CHIP_M32700_TS1
100	, "r4"
101	#endif /* CONFIG_CHIP_M32700_TS1 */
102	);
103	local_irq_restore(flags);
104
105	return result;
106	}
107
108	/**
109	* atomic_add - add integer to atomic variable
110	* @i: integer value to add
111	* @v: pointer of type atomic_t
112	*
113	* Atomically adds @i to @v.
114	*/
115	#define atomic_add(i,v) ((void) atomic_add_return((i), (v)))
116
117	/**
118	* atomic_sub - subtract the atomic variable
119	* @i: integer value to subtract
120	* @v: pointer of type atomic_t
121	*
122	* Atomically subtracts @i from @v.
123	*/
124	#define atomic_sub(i,v) ((void) atomic_sub_return((i), (v)))
125
126	/**
127	* atomic_sub_and_test - subtract value from variable and test result
128	* @i: integer value to subtract
129	* @v: pointer of type atomic_t
130	*
131	* Atomically subtracts @i from @v and returns
132	* true if the result is zero, or false for all
133	* other cases.
134	*/
135	#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
136
137	/**
138	* atomic_inc_return - increment atomic variable and return it
139	* @v: pointer of type atomic_t
140	*
141	* Atomically increments @v by 1 and returns the result.
142	*/
143	static __inline__ int atomic_inc_return(atomic_t *v)
144	{
145	unsigned long flags;
146	int result;
147
148	local_irq_save(flags);
149	__asm__ __volatile__ (
150	"# atomic_inc_return \n\t"
151	DCACHE_CLEAR("%0", "r4", "%1")
152	M32R_LOCK" %0, @%1; \n\t"
153	"addi %0, #1; \n\t"
154	M32R_UNLOCK" %0, @%1; \n\t"
155	: "=&r" (result)
156	: "r" (&v->counter)
157	: "memory"
158	#ifdef CONFIG_CHIP_M32700_TS1
159	, "r4"
160	#endif /* CONFIG_CHIP_M32700_TS1 */
161	);
162	local_irq_restore(flags);
163
164	return result;
165	}
166
167	/**
168	* atomic_dec_return - decrement atomic variable and return it
169	* @v: pointer of type atomic_t
170	*
171	* Atomically decrements @v by 1 and returns the result.
172	*/
173	static __inline__ int atomic_dec_return(atomic_t *v)
174	{
175	unsigned long flags;
176	int result;
177
178	local_irq_save(flags);
179	__asm__ __volatile__ (
180	"# atomic_dec_return \n\t"
181	DCACHE_CLEAR("%0", "r4", "%1")
182	M32R_LOCK" %0, @%1; \n\t"
183	"addi %0, #-1; \n\t"
184	M32R_UNLOCK" %0, @%1; \n\t"
185	: "=&r" (result)
186	: "r" (&v->counter)
187	: "memory"
188	#ifdef CONFIG_CHIP_M32700_TS1
189	, "r4"
190	#endif /* CONFIG_CHIP_M32700_TS1 */
191	);
192	local_irq_restore(flags);
193
194	return result;
195	}
196
197	/**
198	* atomic_inc - increment atomic variable
199	* @v: pointer of type atomic_t
200	*
201	* Atomically increments @v by 1.
202	*/
203	#define atomic_inc(v) ((void)atomic_inc_return(v))
204
205	/**
206	* atomic_dec - decrement atomic variable
207	* @v: pointer of type atomic_t
208	*
209	* Atomically decrements @v by 1.
210	*/
211	#define atomic_dec(v) ((void)atomic_dec_return(v))
212
213	/**
214	* atomic_inc_and_test - increment and test
215	* @v: pointer of type atomic_t
216	*
217	* Atomically increments @v by 1
218	* and returns true if the result is zero, or false for all
219	* other cases.
220	*/
221	#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
222
223	/**
224	* atomic_dec_and_test - decrement and test
225	* @v: pointer of type atomic_t
226	*
227	* Atomically decrements @v by 1 and
228	* returns true if the result is 0, or false for all
229	* other cases.
230	*/
231	#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
232
233	/**
234	* atomic_add_negative - add and test if negative
235	* @v: pointer of type atomic_t
236	* @i: integer value to add
237	*
238	* Atomically adds @i to @v and returns true
239	* if the result is negative, or false when
240	* result is greater than or equal to zero.
241	*/
242	#define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0)
243
0332db5a	244	#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
ffbf670f	245	#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
0332db5a HT	246
	247	/**
	248	* atomic_add_unless - add unless the number is a given value
	249	* @v: pointer of type atomic_t
	250	* @a: the amount to add to v...
	251	* @u: ...unless v is equal to u.
	252	*
	253	* Atomically adds @a to @v, so long as it was not @u.
	254	* Returns non-zero if @v was not @u, and zero otherwise.
	255	*/
	256	#define atomic_add_unless(v, a, u) \
	257	({ \
	258	int c, old; \
	259	c = atomic_read(v); \
	260	while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
	261	c = old; \
	262	c != (u); \
	263	})
	264	#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
	265
1da177e4 LT	266	static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t *addr)
	267	{
	268	unsigned long flags;
	269	unsigned long tmp;
	270
	271	local_irq_save(flags);
	272	__asm__ __volatile__ (
	273	"# atomic_clear_mask \n\t"
	274	DCACHE_CLEAR("%0", "r5", "%1")
	275	M32R_LOCK" %0, @%1; \n\t"
	276	"and %0, %2; \n\t"
	277	M32R_UNLOCK" %0, @%1; \n\t"
	278	: "=&r" (tmp)
	279	: "r" (addr), "r" (~mask)
	280	: "memory"
	281	#ifdef CONFIG_CHIP_M32700_TS1
	282	, "r5"
	283	#endif /* CONFIG_CHIP_M32700_TS1 */
	284	);
	285	local_irq_restore(flags);
	286	}
	287
	288	static __inline__ void atomic_set_mask(unsigned long mask, atomic_t *addr)
	289	{
	290	unsigned long flags;
	291	unsigned long tmp;
	292
	293	local_irq_save(flags);
	294	__asm__ __volatile__ (
	295	"# atomic_set_mask \n\t"
	296	DCACHE_CLEAR("%0", "r5", "%1")
	297	M32R_LOCK" %0, @%1; \n\t"
	298	"or %0, %2; \n\t"
	299	M32R_UNLOCK" %0, @%1; \n\t"
	300	: "=&r" (tmp)
	301	: "r" (addr), "r" (mask)
	302	: "memory"
	303	#ifdef CONFIG_CHIP_M32700_TS1
	304	, "r5"
	305	#endif /* CONFIG_CHIP_M32700_TS1 */
	306	);
	307	local_irq_restore(flags);
	308	}
	309
	310	/* Atomic operations are already serializing on m32r */
	311	#define smp_mb__before_atomic_dec() barrier()
	312	#define smp_mb__after_atomic_dec() barrier()
	313	#define smp_mb__before_atomic_inc() barrier()
	314	#define smp_mb__after_atomic_inc() barrier()
	315
d3cb4871	316	#include <asm-generic/atomic.h>
1da177e4	317	#endif /* _ASM_M32R_ATOMIC_H */