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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 | ||
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13 | #include <linux/device.h> |
14 | #include <linux/seq_file.h> | |
e39be3a3 | 15 | #include <linux/slab.h> |
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16 | |
17 | #include "internal.h" | |
18 | ||
ce11020f XL |
19 | static inline unsigned int regcache_flat_get_index(const struct regmap *map, |
20 | unsigned int reg) | |
21 | { | |
22 | return regcache_get_index_by_order(map, reg); | |
23 | } | |
24 | ||
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25 | static int regcache_flat_init(struct regmap *map) |
26 | { | |
27 | int i; | |
28 | unsigned int *cache; | |
29 | ||
6e4f2878 | 30 | if (!map || map->reg_stride_order < 0 || !map->max_register) |
ce11020f XL |
31 | return -EINVAL; |
32 | ||
33 | map->cache = kcalloc(regcache_flat_get_index(map, map->max_register) | |
34 | + 1, sizeof(unsigned int), GFP_KERNEL); | |
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35 | if (!map->cache) |
36 | return -ENOMEM; | |
37 | ||
38 | cache = map->cache; | |
39 | ||
40 | for (i = 0; i < map->num_reg_defaults; i++) | |
ce11020f XL |
41 | cache[regcache_flat_get_index(map, map->reg_defaults[i].reg)] = |
42 | map->reg_defaults[i].def; | |
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43 | |
44 | return 0; | |
45 | } | |
46 | ||
47 | static int regcache_flat_exit(struct regmap *map) | |
48 | { | |
49 | kfree(map->cache); | |
50 | map->cache = NULL; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static int regcache_flat_read(struct regmap *map, | |
56 | unsigned int reg, unsigned int *value) | |
57 | { | |
58 | unsigned int *cache = map->cache; | |
59 | ||
ce11020f | 60 | *value = cache[regcache_flat_get_index(map, reg)]; |
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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 | ||
ce11020f | 70 | cache[regcache_flat_get_index(map, reg)] = value; |
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71 | |
72 | return 0; | |
73 | } | |
74 | ||
75 | struct regcache_ops regcache_flat_ops = { | |
76 | .type = REGCACHE_FLAT, | |
77 | .name = "flat", | |
78 | .init = regcache_flat_init, | |
79 | .exit = regcache_flat_exit, | |
80 | .read = regcache_flat_read, | |
81 | .write = regcache_flat_write, | |
82 | }; |