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// SPDX-License-Identifier: GPL-2.0
//
// Register map access API - Memory region
//
// This is intended for testing only
//
// Copyright (c) 2023, Arm Ltd
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/swab.h>
#include "internal.h"
static int regmap_ram_write(void *context, unsigned int reg, unsigned int val)
{
struct regmap_ram_data *data = context;
data->vals[reg] = val;
data->written[reg] = true;
return 0;
}
static int regmap_ram_read(void *context, unsigned int reg, unsigned int *val)
{
struct regmap_ram_data *data = context;
*val = data->vals[reg];
data->read[reg] = true;
return 0;
}
static void regmap_ram_free_context(void *context)
{
struct regmap_ram_data *data = context;
kfree(data->vals);
kfree(data->read);
kfree(data->written);
kfree(data);
}
static const struct regmap_bus regmap_ram = {
.fast_io = true,
.reg_write = regmap_ram_write,
.reg_read = regmap_ram_read,
.free_context = regmap_ram_free_context,
};
struct regmap *__regmap_init_ram(struct device *dev,
const struct regmap_config *config,
struct regmap_ram_data *data,
struct lock_class_key *lock_key,
const char *lock_name)
{
struct regmap *map;
if (!config->max_register) {
pr_crit("No max_register specified for RAM regmap\n");
return ERR_PTR(-EINVAL);
}
data->read = kcalloc(config->max_register + 1, sizeof(bool),
GFP_KERNEL);
if (!data->read)
return ERR_PTR(-ENOMEM);
data->written = kcalloc(config->max_register + 1, sizeof(bool),
GFP_KERNEL);
if (!data->written)
return ERR_PTR(-ENOMEM);
map = __regmap_init(dev, ®map_ram, data, config,
lock_key, lock_name);
return map;
}
EXPORT_SYMBOL_GPL(__regmap_init_ram);
MODULE_DESCRIPTION("Register map access API - Memory region");
MODULE_LICENSE("GPL v2");
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