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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2023 Westermo Network Technologies AB
*/
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/nvmem-provider.h>
#include <linux/platform_device.h>
struct qoriq_efuse_priv {
void __iomem *base;
};
static int qoriq_efuse_read(void *context, unsigned int offset, void *val,
size_t bytes)
{
struct qoriq_efuse_priv *priv = context;
/* .stride = 4 so offset is guaranteed to be aligned */
__ioread32_copy(val, priv->base + offset, bytes / 4);
/* Ignore trailing bytes (there shouldn't be any) */
return 0;
}
static int qoriq_efuse_probe(struct platform_device *pdev)
{
struct nvmem_config config = {
.dev = &pdev->dev,
.read_only = true,
.reg_read = qoriq_efuse_read,
.stride = sizeof(u32),
.word_size = sizeof(u32),
.name = "qoriq_efuse_read",
.id = NVMEM_DEVID_AUTO,
.root_only = true,
};
struct qoriq_efuse_priv *priv;
struct nvmem_device *nvmem;
struct resource *res;
priv = devm_kzalloc(config.dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
config.size = resource_size(res);
config.priv = priv;
nvmem = devm_nvmem_register(config.dev, &config);
return PTR_ERR_OR_ZERO(nvmem);
}
static const struct of_device_id qoriq_efuse_of_match[] = {
{ .compatible = "fsl,t1023-sfp", },
{/* sentinel */},
};
MODULE_DEVICE_TABLE(of, qoriq_efuse_of_match);
static struct platform_driver qoriq_efuse_driver = {
.probe = qoriq_efuse_probe,
.driver = {
.name = "qoriq-efuse",
.of_match_table = qoriq_efuse_of_match,
},
};
module_platform_driver(qoriq_efuse_driver);
MODULE_AUTHOR("Richard Alpe <richard.alpe@bit42.se>");
MODULE_DESCRIPTION("NXP QorIQ Security Fuse Processor (SFP) Reader");
MODULE_LICENSE("GPL");
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