1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *  Port on Texas Instruments TMS320C6x architecture
4 *
5 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
6 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
7 */
8#ifndef _ASM_C6X_CMPXCHG_H
9#define _ASM_C6X_CMPXCHG_H
10
11#include <linux/irqflags.h>
12
13/*
14 * Misc. functions
15 */
16static inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size)
17{
18	unsigned int tmp;
19	unsigned long flags;
20
21	local_irq_save(flags);
22
23	switch (size) {
24	case 1:
25		tmp = 0;
26		tmp = *((unsigned char *) ptr);
27		*((unsigned char *) ptr) = (unsigned char) x;
28		break;
29	case 2:
30		tmp = 0;
31		tmp = *((unsigned short *) ptr);
32		*((unsigned short *) ptr) = x;
33		break;
34	case 4:
35		tmp = 0;
36		tmp = *((unsigned int *) ptr);
37		*((unsigned int *) ptr) = x;
38		break;
39	}
40	local_irq_restore(flags);
41	return tmp;
42}
43
44#define xchg(ptr, x) \
45	((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \
46				    sizeof(*(ptr))))
47
48#include <asm-generic/cmpxchg-local.h>
49
50/*
51 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
52 * them available.
53 */
54#define cmpxchg_local(ptr, o, n)					\
55	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),		\
56						     (unsigned long)(o), \
57						     (unsigned long)(n), \
58						     sizeof(*(ptr))))
59#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
60
61#include <asm-generic/cmpxchg.h>
62
63#endif /* _ASM_C6X_CMPXCHG_H */
64