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
regcache_flat_get_index(const struct regmap * map,unsigned int reg)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
regcache_flat_init(struct regmap * map)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_is_set)
27 return -EINVAL;
28
29 map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)
30 + 1, sizeof(unsigned int), map->alloc_flags);
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
regcache_flat_exit(struct regmap * map)46 static int regcache_flat_exit(struct regmap *map)
47 {
48 kfree(map->cache);
49 map->cache = NULL;
50
51 return 0;
52 }
53
regcache_flat_read(struct regmap * map,unsigned int reg,unsigned int * value)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
regcache_flat_write(struct regmap * map,unsigned int reg,unsigned int value)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