// 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 = kzalloc_objs(bool, config->max_register + 1);	if (!data->read)		return ERR_PTR(-ENOMEM); 	data->written = kzalloc_objs(bool, config->max_register + 1);	if (!data->written) {		kfree(data->read);		return ERR_PTR(-ENOMEM);	} 	map = __regmap_init(dev, &regmap_ram, data, config,			    lock_key, lock_name);	if (IS_ERR(map)) {		kfree(data->read);		kfree(data->written);	} 	return map;}EXPORT_SYMBOL_GPL(__regmap_init_ram); MODULE_DESCRIPTION("Register map access API - Memory region");MODULE_LICENSE("GPL v2");