1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2016-2017 Synopsys, Inc. (www.synopsys.com)
4 */
5
6#ifndef __SOC_ARC_AUX_H__
7#define __SOC_ARC_AUX_H__
8
9#ifdef CONFIG_ARC
10
11#define read_aux_reg(r) __builtin_arc_lr(r)
12
13/* gcc builtin sr needs reg param to be long immediate */
14#define write_aux_reg(r, v) __builtin_arc_sr((unsigned int)(v), r)
15
16#else /* !CONFIG_ARC */
17
18static inline int read_aux_reg(u32 r)
19{
20 return 0;
21}
22
23/*
24 * function helps elide unused variable warning
25 * see: https://lists.infradead.org/pipermail/linux-snps-arc/2016-November/001748.html
26 */
27static inline void write_aux_reg(u32 r, u32 v)
28{
29 ;
30}
31
32#endif
33
34#define READ_BCR(reg, into) \
35{ \
36 unsigned int tmp; \
37 tmp = read_aux_reg(reg); \
38 if (sizeof(tmp) == sizeof(into)) { \
39 into = *((typeof(into) *)&tmp); \
40 } else { \
41 extern void bogus_undefined(void); \
42 bogus_undefined(); \
43 } \
44}
45
46#define WRITE_AUX(reg, into) \
47{ \
48 unsigned int tmp; \
49 if (sizeof(tmp) == sizeof(into)) { \
50 tmp = (*(unsigned int *)&(into)); \
51 write_aux_reg(reg, tmp); \
52 } else { \
53 extern void bogus_undefined(void); \
54 bogus_undefined(); \
55 } \
56}
57
58
59#endif
60

source code of linux/include/soc/arc/aux.h