projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ac902ce MB |
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 | ||
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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) |
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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++) | |
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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 | }; |