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 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
25static int regcache_flat_init(struct regmap *map)
26{
27	int i;
28	unsigned int *cache;
29
30	if (!map || map->reg_stride_order < 0 || !map->max_register)
31		return -EINVAL;
32
33	map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)
34			     + 1, sizeof(unsigned int), GFP_KERNEL);
35	if (!map->cache)
36		return -ENOMEM;
37
38	cache = map->cache;
39
40	for (i = 0; i < map->num_reg_defaults; i++)
41		cache[regcache_flat_get_index(map, map->reg_defaults[i].reg)] =
42				map->reg_defaults[i].def;
43
44	return 0;
45}
46
47static int regcache_flat_exit(struct regmap *map)
48{
49	kfree(map->cache);
50	map->cache = NULL;
51
52	return 0;
53}
54
55static int regcache_flat_read(struct regmap *map,
56			      unsigned int reg, unsigned int *value)
57{
58	unsigned int *cache = map->cache;
59
60	*value = cache[regcache_flat_get_index(map, reg)];
61
62	return 0;
63}
64
65static int regcache_flat_write(struct regmap *map, unsigned int reg,
66			       unsigned int value)
67{
68	unsigned int *cache = map->cache;
69
70	cache[regcache_flat_get_index(map, reg)] = value;
71
72	return 0;
73}
74
75struct 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};