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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
*/
#include <io.h>
#include <driver.h>
#include <linux/nvmem-provider.h>
#include <init.h>
struct rmem {
struct device_d *dev;
const struct resource *mem;
};
static int rmem_read(void *context, unsigned int offset,
void *val, size_t bytes)
{
struct rmem *rmem = context;
return mem_copy(rmem->dev, val, (void *)rmem->mem->start + offset,
bytes, offset, 0);
}
static struct nvmem_bus rmem_nvmem_bus = {
.read = rmem_read,
};
static int rmem_probe(struct device_d *dev)
{
struct nvmem_config config = { };
struct resource *mem;
struct rmem *priv;
mem = dev_request_mem_resource(dev, 0);
if (IS_ERR(mem))
return PTR_ERR(mem);
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->mem = mem;
config.dev = priv->dev = dev;
config.priv = priv;
config.name = "rmem";
config.size = resource_size(mem);
config.bus = &rmem_nvmem_bus;
return PTR_ERR_OR_ZERO(nvmem_register(&config));
}
static const struct of_device_id rmem_match[] = {
{ .compatible = "nvmem-rmem", },
{ /* sentinel */ },
};
static struct driver_d rmem_driver = {
.name = "rmem",
.of_compatible = rmem_match,
.probe = rmem_probe,
};
device_platform_driver(rmem_driver);
MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de>");
MODULE_DESCRIPTION("Reserved Memory Based nvmem Driver");
MODULE_LICENSE("GPL");
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