1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // Register cache access API - flat caching support |
4 | // |
5 | // Copyright 2012 Wolfson Microelectronics plc |
6 | // |
7 | // Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
8 | |
9 | #include <linux/device.h> |
10 | #include <linux/seq_file.h> |
11 | #include <linux/slab.h> |
12 | |
13 | #include "internal.h" |
14 | |
15 | static inline unsigned int regcache_flat_get_index(const struct regmap *map, |
16 | unsigned int reg) |
17 | { |
18 | return regcache_get_index_by_order(map, reg); |
19 | } |
20 | |
21 | static int regcache_flat_init(struct regmap *map) |
22 | { |
23 | int i; |
24 | unsigned int *cache; |
25 | |
26 | if (!map || map->reg_stride_order < 0 || !map->max_register) |
27 | return -EINVAL; |
28 | |
29 | map->cache = kcalloc(n: regcache_flat_get_index(map, reg: map->max_register) |
30 | + 1, size: sizeof(unsigned int), GFP_KERNEL); |
31 | if (!map->cache) |
32 | return -ENOMEM; |
33 | |
34 | cache = map->cache; |
35 | |
36 | for (i = 0; i < map->num_reg_defaults; i++) { |
37 | unsigned int reg = map->reg_defaults[i].reg; |
38 | unsigned int index = regcache_flat_get_index(map, reg); |
39 | |
40 | cache[index] = map->reg_defaults[i].def; |
41 | } |
42 | |
43 | return 0; |
44 | } |
45 | |
46 | static int regcache_flat_exit(struct regmap *map) |
47 | { |
48 | kfree(objp: map->cache); |
49 | map->cache = NULL; |
50 | |
51 | return 0; |
52 | } |
53 | |
54 | static int regcache_flat_read(struct regmap *map, |
55 | unsigned int reg, unsigned int *value) |
56 | { |
57 | unsigned int *cache = map->cache; |
58 | unsigned int index = regcache_flat_get_index(map, reg); |
59 | |
60 | *value = cache[index]; |
61 | |
62 | return 0; |
63 | } |
64 | |
65 | static int regcache_flat_write(struct regmap *map, unsigned int reg, |
66 | unsigned int value) |
67 | { |
68 | unsigned int *cache = map->cache; |
69 | unsigned int index = regcache_flat_get_index(map, reg); |
70 | |
71 | cache[index] = value; |
72 | |
73 | return 0; |
74 | } |
75 | |
76 | struct regcache_ops regcache_flat_ops = { |
77 | .type = REGCACHE_FLAT, |
78 | .name = "flat" , |
79 | .init = regcache_flat_init, |
80 | .exit = regcache_flat_exit, |
81 | .read = regcache_flat_read, |
82 | .write = regcache_flat_write, |
83 | }; |
84 | |