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1 | /* |
2 | * Register cache access API - flat caching support | |
3 | * | |
4 | * Copyright 2012 Wolfson Microelectronics plc | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/slab.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/seq_file.h> | |
16 | ||
17 | #include "internal.h" | |
18 | ||
19 | static int regcache_flat_init(struct regmap *map) | |
20 | { | |
21 | int i; | |
22 | unsigned int *cache; | |
23 | ||
24 | map->cache = kzalloc(sizeof(unsigned int) * (map->max_register + 1), | |
25 | GFP_KERNEL); | |
26 | if (!map->cache) | |
27 | return -ENOMEM; | |
28 | ||
29 | cache = map->cache; | |
30 | ||
31 | for (i = 0; i < map->num_reg_defaults; i++) | |
32 | cache[map->reg_defaults[i].reg] = map->reg_defaults[i].def; | |
33 | ||
34 | return 0; | |
35 | } | |
36 | ||
37 | static int regcache_flat_exit(struct regmap *map) | |
38 | { | |
39 | kfree(map->cache); | |
40 | map->cache = NULL; | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | static int regcache_flat_read(struct regmap *map, | |
46 | unsigned int reg, unsigned int *value) | |
47 | { | |
48 | unsigned int *cache = map->cache; | |
49 | ||
50 | *value = cache[reg]; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static int regcache_flat_write(struct regmap *map, unsigned int reg, | |
56 | unsigned int value) | |
57 | { | |
58 | unsigned int *cache = map->cache; | |
59 | ||
60 | cache[reg] = value; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | struct regcache_ops regcache_flat_ops = { | |
66 | .type = REGCACHE_FLAT, | |
67 | .name = "flat", | |
68 | .init = regcache_flat_init, | |
69 | .exit = regcache_flat_exit, | |
70 | .read = regcache_flat_read, | |
71 | .write = regcache_flat_write, | |
72 | }; |