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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* | |
3 | * Copyright (c) 2015 Endless Mobile, Inc. | |
4 | * Author: Carlo Caione <carlo@endlessm.com> | |
5 | */ | |
6 | ||
7 | #ifndef __MESON_PARM_H | |
8 | #define __MESON_PARM_H | |
9 | ||
10 | #include <linux/bits.h> | |
11 | #include <linux/regmap.h> | |
12 | ||
13 | #define PMASK(width) GENMASK(width - 1, 0) | |
14 | #define SETPMASK(width, shift) GENMASK(shift + width - 1, shift) | |
15 | #define CLRPMASK(width, shift) (~SETPMASK(width, shift)) | |
16 | ||
17 | #define PARM_GET(width, shift, reg) \ | |
18 | (((reg) & SETPMASK(width, shift)) >> (shift)) | |
19 | #define PARM_SET(width, shift, reg, val) \ | |
20 | (((reg) & CLRPMASK(width, shift)) | ((val) << (shift))) | |
21 | ||
22 | #define MESON_PARM_APPLICABLE(p) (!!((p)->width)) | |
23 | ||
24 | struct parm { | |
25 | u16 reg_off; | |
26 | u8 shift; | |
27 | u8 width; | |
28 | }; | |
29 | ||
30 | static inline unsigned int meson_parm_read(struct regmap *map, struct parm *p) | |
31 | { | |
32 | unsigned int val; | |
33 | ||
34 | regmap_read(map, p->reg_off, &val); | |
35 | return PARM_GET(p->width, p->shift, val); | |
36 | } | |
37 | ||
38 | static inline void meson_parm_write(struct regmap *map, struct parm *p, | |
39 | unsigned int val) | |
40 | { | |
41 | regmap_update_bits(map, p->reg_off, SETPMASK(p->width, p->shift), | |
42 | val << p->shift); | |
43 | } | |
44 | ||
45 | #endif /* __MESON_PARM_H */ | |
46 |