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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  */
__xchg(unsigned int x,volatile void * ptr,int size)16 static 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