1*f6352424SMark Brown // SPDX-License-Identifier: GPL-2.0
2*f6352424SMark Brown //
3*f6352424SMark Brown // Register map access API - Memory region
4*f6352424SMark Brown //
5*f6352424SMark Brown // This is intended for testing only
6*f6352424SMark Brown //
7*f6352424SMark Brown // Copyright (c) 2023, Arm Ltd
8*f6352424SMark Brown
9*f6352424SMark Brown #include <linux/clk.h>
10*f6352424SMark Brown #include <linux/err.h>
11*f6352424SMark Brown #include <linux/io.h>
12*f6352424SMark Brown #include <linux/module.h>
13*f6352424SMark Brown #include <linux/regmap.h>
14*f6352424SMark Brown #include <linux/slab.h>
15*f6352424SMark Brown #include <linux/swab.h>
16*f6352424SMark Brown
17*f6352424SMark Brown #include "internal.h"
18*f6352424SMark Brown
regmap_ram_write(void * context,unsigned int reg,unsigned int val)19*f6352424SMark Brown static int regmap_ram_write(void *context, unsigned int reg, unsigned int val)
20*f6352424SMark Brown {
21*f6352424SMark Brown struct regmap_ram_data *data = context;
22*f6352424SMark Brown
23*f6352424SMark Brown data->vals[reg] = val;
24*f6352424SMark Brown data->written[reg] = true;
25*f6352424SMark Brown
26*f6352424SMark Brown return 0;
27*f6352424SMark Brown }
28*f6352424SMark Brown
regmap_ram_read(void * context,unsigned int reg,unsigned int * val)29*f6352424SMark Brown static int regmap_ram_read(void *context, unsigned int reg, unsigned int *val)
30*f6352424SMark Brown {
31*f6352424SMark Brown struct regmap_ram_data *data = context;
32*f6352424SMark Brown
33*f6352424SMark Brown *val = data->vals[reg];
34*f6352424SMark Brown data->read[reg] = true;
35*f6352424SMark Brown
36*f6352424SMark Brown return 0;
37*f6352424SMark Brown }
38*f6352424SMark Brown
regmap_ram_free_context(void * context)39*f6352424SMark Brown static void regmap_ram_free_context(void *context)
40*f6352424SMark Brown {
41*f6352424SMark Brown struct regmap_ram_data *data = context;
42*f6352424SMark Brown
43*f6352424SMark Brown kfree(data->vals);
44*f6352424SMark Brown kfree(data->read);
45*f6352424SMark Brown kfree(data->written);
46*f6352424SMark Brown kfree(data);
47*f6352424SMark Brown }
48*f6352424SMark Brown
49*f6352424SMark Brown static const struct regmap_bus regmap_ram = {
50*f6352424SMark Brown .fast_io = true,
51*f6352424SMark Brown .reg_write = regmap_ram_write,
52*f6352424SMark Brown .reg_read = regmap_ram_read,
53*f6352424SMark Brown .free_context = regmap_ram_free_context,
54*f6352424SMark Brown };
55*f6352424SMark Brown
__regmap_init_ram(const struct regmap_config * config,struct regmap_ram_data * data,struct lock_class_key * lock_key,const char * lock_name)56*f6352424SMark Brown struct regmap *__regmap_init_ram(const struct regmap_config *config,
57*f6352424SMark Brown struct regmap_ram_data *data,
58*f6352424SMark Brown struct lock_class_key *lock_key,
59*f6352424SMark Brown const char *lock_name)
60*f6352424SMark Brown {
61*f6352424SMark Brown struct regmap *map;
62*f6352424SMark Brown
63*f6352424SMark Brown if (!config->max_register) {
64*f6352424SMark Brown pr_crit("No max_register specified for RAM regmap\n");
65*f6352424SMark Brown return ERR_PTR(-EINVAL);
66*f6352424SMark Brown }
67*f6352424SMark Brown
68*f6352424SMark Brown data->read = kcalloc(sizeof(bool), config->max_register + 1,
69*f6352424SMark Brown GFP_KERNEL);
70*f6352424SMark Brown if (!data->read)
71*f6352424SMark Brown return ERR_PTR(-ENOMEM);
72*f6352424SMark Brown
73*f6352424SMark Brown data->written = kcalloc(sizeof(bool), config->max_register + 1,
74*f6352424SMark Brown GFP_KERNEL);
75*f6352424SMark Brown if (!data->written)
76*f6352424SMark Brown return ERR_PTR(-ENOMEM);
77*f6352424SMark Brown
78*f6352424SMark Brown map = __regmap_init(NULL, ®map_ram, data, config,
79*f6352424SMark Brown lock_key, lock_name);
80*f6352424SMark Brown
81*f6352424SMark Brown return map;
82*f6352424SMark Brown }
83*f6352424SMark Brown EXPORT_SYMBOL_GPL(__regmap_init_ram);
84*f6352424SMark Brown
85*f6352424SMark Brown MODULE_LICENSE("GPL v2");
86