| 1 | /*
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| 2 | * Register cache access API - flat caching support
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| 3 | *
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| 4 | * Copyright 2012 Wolfson Microelectronics plc
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| 5 | *
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| 6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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| 7 | *
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| 8 | * This program is free software; you can redistribute it and/or modify
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| 9 | * it under the terms of the GNU General Public License version 2 as
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| 10 | * published by the Free Software Foundation.
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| 11 | */
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| 12 | /* from 4.19.163 */
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| 13 |
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| 14 | #include <linux/device.h>
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| 15 | #include <linux/seq_file.h>
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| 16 | #include <linux/slab.h>
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| 17 |
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| 18 | #include "internal.h"
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| 19 |
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| 20 | static inline unsigned int regcache_flat_get_index(const struct regmap *map,
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| 21 | unsigned int reg)
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| 22 | {
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| 23 | return regcache_get_index_by_order(map, reg);
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| 24 | }
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| 25 |
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| 26 | static int regcache_flat_init(struct regmap *map)
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| 27 | {
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| 28 | int i;
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| 29 | unsigned int *cache;
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| 30 |
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| 31 | if (!map || map->reg_stride_order < 0 || !map->max_register)
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| 32 | return -EINVAL;
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| 33 |
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| 34 | map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)
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| 35 | + 1, sizeof(unsigned int), GFP_KERNEL);
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| 36 | if (!map->cache)
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| 37 | return -ENOMEM;
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| 38 |
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| 39 | cache = map->cache;
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| 40 |
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| 41 | for (i = 0; i < map->num_reg_defaults; i++) {
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| 42 | unsigned int reg = map->reg_defaults[i].reg;
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| 43 | unsigned int index = regcache_flat_get_index(map, reg);
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| 44 |
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| 45 | cache[index] = map->reg_defaults[i].def;
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| 46 | }
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| 47 |
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| 48 | return 0;
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| 49 | }
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| 50 |
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| 51 | static int regcache_flat_exit(struct regmap *map)
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| 52 | {
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| 53 | kfree(map->cache);
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| 54 | map->cache = NULL;
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| 55 |
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| 56 | return 0;
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| 57 | }
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| 58 |
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| 59 | static int regcache_flat_read(struct regmap *map,
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| 60 | unsigned int reg, unsigned int *value)
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| 61 | {
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| 62 | unsigned int *cache = map->cache;
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| 63 | unsigned int index = regcache_flat_get_index(map, reg);
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| 64 |
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| 65 | *value = cache[index];
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| 66 |
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| 67 | return 0;
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| 68 | }
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| 69 |
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| 70 | static int regcache_flat_write(struct regmap *map, unsigned int reg,
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| 71 | unsigned int value)
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| 72 | {
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| 73 | unsigned int *cache = map->cache;
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| 74 | unsigned int index = regcache_flat_get_index(map, reg);
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| 75 |
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| 76 | cache[index] = value;
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| 77 |
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| 78 | return 0;
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| 79 | }
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| 80 |
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| 81 | struct regcache_ops regcache_flat_ops = {
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| 82 | .type = REGCACHE_FLAT,
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| 83 | .name = "flat",
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| 84 | .init = regcache_flat_init,
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| 85 | .exit = regcache_flat_exit,
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| 86 | .read = regcache_flat_read,
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| 87 | .write = regcache_flat_write,
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| 88 | };
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