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
24struct parm {
25 u16 reg_off;
26 u8 shift;
27 u8 width;
28};
29
30static inline unsigned int meson_parm_read(struct regmap *map, struct parm *p)
31{
32 unsigned int val;
33
34 regmap_read(map, reg: p->reg_off, val: &val);
35 return PARM_GET(p->width, p->shift, val);
36}
37
38static inline void meson_parm_write(struct regmap *map, struct parm *p,
39 unsigned int val)
40{
41 regmap_update_bits(map, reg: p->reg_off, SETPMASK(p->width, p->shift),
42 val: val << p->shift);
43}
44
45#endif /* __MESON_PARM_H */
46
47

source code of linux/drivers/clk/meson/parm.h