1/*
2 *  Port on Texas Instruments TMS320C6x architecture
3 *
4 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
5 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
6 *
7 *  This program is free software; you can redistribute it and/or modify
8 *  it under the terms of the GNU General Public License version 2 as
9 *  published by the Free Software Foundation.
10 */
11#ifndef _ASM_C6X_CMPXCHG_H
12#define _ASM_C6X_CMPXCHG_H
13
14#include <linux/irqflags.h>
15
16/*
17 * Misc. functions
18 */
19static inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size)
20{
21	unsigned int tmp;
22	unsigned long flags;
23
24	local_irq_save(flags);
25
26	switch (size) {
27	case 1:
28		tmp = 0;
29		tmp = *((unsigned char *) ptr);
30		*((unsigned char *) ptr) = (unsigned char) x;
31		break;
32	case 2:
33		tmp = 0;
34		tmp = *((unsigned short *) ptr);
35		*((unsigned short *) ptr) = x;
36		break;
37	case 4:
38		tmp = 0;
39		tmp = *((unsigned int *) ptr);
40		*((unsigned int *) ptr) = x;
41		break;
42	}
43	local_irq_restore(flags);
44	return tmp;
45}
46
47#define xchg(ptr, x) \
48	((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \
49				    sizeof(*(ptr))))
50#define tas(ptr)    xchg((ptr), 1)
51
52
53#include <asm-generic/cmpxchg-local.h>
54
55/*
56 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
57 * them available.
58 */
59#define cmpxchg_local(ptr, o, n)					\
60	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),		\
61						     (unsigned long)(o), \
62						     (unsigned long)(n), \
63						     sizeof(*(ptr))))
64#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
65
66#include <asm-generic/cmpxchg.h>
67
68#endif /* _ASM_C6X_CMPXCHG_H */
69