[mirror_ubuntu-zesty-kernel.git] / arch / blackfin / include / asm / cmpxchg.h

/*
 * Copyright 2004-2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef __ARCH_BLACKFIN_CMPXCHG__
#define __ARCH_BLACKFIN_CMPXCHG__

#ifdef CONFIG_SMP

#include <linux/linkage.h>

asmlinkage unsigned long __raw_xchg_1_asm(volatile void *ptr, unsigned long value);
asmlinkage unsigned long __raw_xchg_2_asm(volatile void *ptr, unsigned long value);
asmlinkage unsigned long __raw_xchg_4_asm(volatile void *ptr, unsigned long value);
asmlinkage unsigned long __raw_cmpxchg_1_asm(volatile void *ptr,
					unsigned long new, unsigned long old);
asmlinkage unsigned long __raw_cmpxchg_2_asm(volatile void *ptr,
					unsigned long new, unsigned long old);
asmlinkage unsigned long __raw_cmpxchg_4_asm(volatile void *ptr,
					unsigned long new, unsigned long old);

static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
				   int size)
{
	unsigned long tmp;

	switch (size) {
	case 1:
		tmp = __raw_xchg_1_asm(ptr, x);
		break;
	case 2:
		tmp = __raw_xchg_2_asm(ptr, x);
		break;
	case 4:
		tmp = __raw_xchg_4_asm(ptr, x);
		break;
	}

	return tmp;
}

/*
 * Atomic compare and exchange.  Compare OLD with MEM, if identical,
 * store NEW in MEM.  Return the initial value in MEM.  Success is
 * indicated by comparing RETURN with OLD.
 */
static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
				      unsigned long new, int size)
{
	unsigned long tmp;

	switch (size) {
	case 1:
		tmp = __raw_cmpxchg_1_asm(ptr, new, old);
		break;
	case 2:
		tmp = __raw_cmpxchg_2_asm(ptr, new, old);
		break;
	case 4:
		tmp = __raw_cmpxchg_4_asm(ptr, new, old);
		break;
	}

	return tmp;
}
#define cmpxchg(ptr, o, n) \
	((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
		(unsigned long)(n), sizeof(*(ptr))))

#else /* !CONFIG_SMP */

#include <mach/blackfin.h>
#include <asm/irqflags.h>

struct __xchg_dummy {
	unsigned long a[100];
};
#define __xg(x) ((volatile struct __xchg_dummy *)(x))

static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
				   int size)
{
	unsigned long tmp = 0;
	unsigned long flags;

	flags = hard_local_irq_save();

	switch (size) {
	case 1:
		__asm__ __volatile__
			("%0 = b%2 (z);\n\t"
			 "b%2 = %1;\n\t"
			 : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
		break;
	case 2:
		__asm__ __volatile__
			("%0 = w%2 (z);\n\t"
			 "w%2 = %1;\n\t"
			 : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
		break;
	case 4:
		__asm__ __volatile__
			("%0 = %2;\n\t"
			 "%2 = %1;\n\t"
			 : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
		break;
	}
	hard_local_irq_restore(flags);
	return tmp;
}

#include <asm-generic/cmpxchg-local.h>

/*
 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
 * them available.
 */
#define cmpxchg_local(ptr, o, n)				  	       \
	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
			(unsigned long)(n), sizeof(*(ptr))))
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))

#define cmpxchg(ptr, o, n)	cmpxchg_local((ptr), (o), (n))
#define cmpxchg64(ptr, o, n)	cmpxchg64_local((ptr), (o), (n))

#endif /* !CONFIG_SMP */

#define xchg(ptr, x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))

#endif /* __ARCH_BLACKFIN_CMPXCHG__ */
Commit	Line	Data
3bed8d67 DH	1	/*
	2	* Copyright 2004-2011 Analog Devices Inc.
	3	*
	4	* Licensed under the GPL-2 or later.
	5	*/
	6
	7	#ifndef __ARCH_BLACKFIN_CMPXCHG__
	8	#define __ARCH_BLACKFIN_CMPXCHG__
	9
	10	#ifdef CONFIG_SMP
	11
	12	#include <linux/linkage.h>
	13
	14	asmlinkage unsigned long __raw_xchg_1_asm(volatile void *ptr, unsigned long value);
	15	asmlinkage unsigned long __raw_xchg_2_asm(volatile void *ptr, unsigned long value);
	16	asmlinkage unsigned long __raw_xchg_4_asm(volatile void *ptr, unsigned long value);
	17	asmlinkage unsigned long __raw_cmpxchg_1_asm(volatile void *ptr,
	18	unsigned long new, unsigned long old);
	19	asmlinkage unsigned long __raw_cmpxchg_2_asm(volatile void *ptr,
	20	unsigned long new, unsigned long old);
	21	asmlinkage unsigned long __raw_cmpxchg_4_asm(volatile void *ptr,
	22	unsigned long new, unsigned long old);
	23
	24	static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
	25	int size)
	26	{
	27	unsigned long tmp;
	28
	29	switch (size) {
	30	case 1:
	31	tmp = __raw_xchg_1_asm(ptr, x);
	32	break;
	33	case 2:
	34	tmp = __raw_xchg_2_asm(ptr, x);
	35	break;
	36	case 4:
	37	tmp = __raw_xchg_4_asm(ptr, x);
	38	break;
	39	}
	40
	41	return tmp;
	42	}
	43
	44	/*
	45	* Atomic compare and exchange. Compare OLD with MEM, if identical,
	46	* store NEW in MEM. Return the initial value in MEM. Success is
	47	* indicated by comparing RETURN with OLD.
	48	*/
	49	static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
	50	unsigned long new, int size)
	51	{
	52	unsigned long tmp;
	53
	54	switch (size) {
	55	case 1:
	56	tmp = __raw_cmpxchg_1_asm(ptr, new, old);
	57	break;
	58	case 2:
	59	tmp = __raw_cmpxchg_2_asm(ptr, new, old);
	60	break;
	61	case 4:
	62	tmp = __raw_cmpxchg_4_asm(ptr, new, old);
	63	break;
	64	}
65
66	return tmp;
67	}
68	#define cmpxchg(ptr, o, n) \
69	((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
70	(unsigned long)(n), sizeof(*(ptr))))
71
72	#else /* !CONFIG_SMP */
73
74	#include <mach/blackfin.h>
75	#include <asm/irqflags.h>
76
77	struct __xchg_dummy {
78	unsigned long a[100];
79	};
80	#define __xg(x) ((volatile struct __xchg_dummy *)(x))
81
82	static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
83	int size)
84	{
85	unsigned long tmp = 0;
86	unsigned long flags;
87
88	flags = hard_local_irq_save();
89
90	switch (size) {
91	case 1:
92	__asm__ __volatile__
93	("%0 = b%2 (z);\n\t"
94	"b%2 = %1;\n\t"
95	: "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
96	break;
97	case 2:
98	__asm__ __volatile__
99	("%0 = w%2 (z);\n\t"
100	"w%2 = %1;\n\t"
101	: "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
102	break;
103	case 4:
104	__asm__ __volatile__
105	("%0 = %2;\n\t"
106	"%2 = %1;\n\t"
107	: "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
108	break;
109	}
110	hard_local_irq_restore(flags);
111	return tmp;
112	}
113
114	#include <asm-generic/cmpxchg-local.h>
115
116	/*
117	* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
118	* them available.
119	*/
120	#define cmpxchg_local(ptr, o, n) \
121	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
122	(unsigned long)(n), sizeof(*(ptr))))
123	#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
124
1512cdc3 PG	125	#define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n))
1512cdc3 PG	126	#define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n))
3bed8d67 DH	127
	128	#endif /* !CONFIG_SMP */
	129
	130	#define xchg(ptr, x) ((__typeof__((ptr)))__xchg((unsigned long)(x), (ptr), sizeof((ptr))))
3bed8d67 DH	131
3bed8d67 DH	132	#endif /* __ARCH_BLACKFIN_CMPXCHG__ */