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/device.h>
14#include <linux/seq_file.h>
15#include <linux/slab.h>
16
17#include "internal.h"
18
19static 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
37static int regcache_flat_exit(struct regmap *map)
38{
39	kfree(map->cache);
40	map->cache = NULL;
41
42	return 0;
43}
44
45static 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
55static 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
65struct 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};
73