| 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 | |