1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun //
3*4882a593Smuzhiyun // Register cache access API - flat caching support
4*4882a593Smuzhiyun //
5*4882a593Smuzhiyun // Copyright 2012 Wolfson Microelectronics plc
6*4882a593Smuzhiyun //
7*4882a593Smuzhiyun // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/device.h>
10*4882a593Smuzhiyun #include <linux/seq_file.h>
11*4882a593Smuzhiyun #include <linux/slab.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include "internal.h"
14*4882a593Smuzhiyun
regcache_flat_get_index(const struct regmap * map,unsigned int reg)15*4882a593Smuzhiyun static inline unsigned int regcache_flat_get_index(const struct regmap *map,
16*4882a593Smuzhiyun unsigned int reg)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun return regcache_get_index_by_order(map, reg);
19*4882a593Smuzhiyun }
20*4882a593Smuzhiyun
regcache_flat_init(struct regmap * map)21*4882a593Smuzhiyun static int regcache_flat_init(struct regmap *map)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun int i;
24*4882a593Smuzhiyun unsigned int *cache;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun if (!map || map->reg_stride_order < 0 || !map->max_register)
27*4882a593Smuzhiyun return -EINVAL;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)
30*4882a593Smuzhiyun + 1, sizeof(unsigned int), GFP_KERNEL);
31*4882a593Smuzhiyun if (!map->cache)
32*4882a593Smuzhiyun return -ENOMEM;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun cache = map->cache;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun for (i = 0; i < map->num_reg_defaults; i++) {
37*4882a593Smuzhiyun unsigned int reg = map->reg_defaults[i].reg;
38*4882a593Smuzhiyun unsigned int index = regcache_flat_get_index(map, reg);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun cache[index] = map->reg_defaults[i].def;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun return 0;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
regcache_flat_exit(struct regmap * map)46*4882a593Smuzhiyun static int regcache_flat_exit(struct regmap *map)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun kfree(map->cache);
49*4882a593Smuzhiyun map->cache = NULL;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun return 0;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
regcache_flat_read(struct regmap * map,unsigned int reg,unsigned int * value)54*4882a593Smuzhiyun static int regcache_flat_read(struct regmap *map,
55*4882a593Smuzhiyun unsigned int reg, unsigned int *value)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun unsigned int *cache = map->cache;
58*4882a593Smuzhiyun unsigned int index = regcache_flat_get_index(map, reg);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun *value = cache[index];
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun return 0;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
regcache_flat_write(struct regmap * map,unsigned int reg,unsigned int value)65*4882a593Smuzhiyun static int regcache_flat_write(struct regmap *map, unsigned int reg,
66*4882a593Smuzhiyun unsigned int value)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun unsigned int *cache = map->cache;
69*4882a593Smuzhiyun unsigned int index = regcache_flat_get_index(map, reg);
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun cache[index] = value;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun return 0;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun struct regcache_ops regcache_flat_ops = {
77*4882a593Smuzhiyun .type = REGCACHE_FLAT,
78*4882a593Smuzhiyun .name = "flat",
79*4882a593Smuzhiyun .init = regcache_flat_init,
80*4882a593Smuzhiyun .exit = regcache_flat_exit,
81*4882a593Smuzhiyun .read = regcache_flat_read,
82*4882a593Smuzhiyun .write = regcache_flat_write,
83*4882a593Smuzhiyun };
84