mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-09-22 12:44:11 +08:00
f78451012b
Add support for the Security Fuse Processor found on Layerscape SoCs. This driver implements basic read access. Signed-off-by: Michael Walle <michael@walle.cc> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20220220151527.17216-10-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Layerscape SFP driver
|
|
*
|
|
* Copyright (c) 2022 Michael Walle <michael@walle.cc>
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/nvmem-provider.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/property.h>
|
|
|
|
#define LAYERSCAPE_SFP_OTP_OFFSET 0x0200
|
|
|
|
struct layerscape_sfp_priv {
|
|
void __iomem *base;
|
|
};
|
|
|
|
struct layerscape_sfp_data {
|
|
int size;
|
|
};
|
|
|
|
static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
|
|
size_t bytes)
|
|
{
|
|
struct layerscape_sfp_priv *priv = context;
|
|
|
|
memcpy_fromio(val, priv->base + LAYERSCAPE_SFP_OTP_OFFSET + offset,
|
|
bytes);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nvmem_config layerscape_sfp_nvmem_config = {
|
|
.name = "fsl-sfp",
|
|
.reg_read = layerscape_sfp_read,
|
|
};
|
|
|
|
static int layerscape_sfp_probe(struct platform_device *pdev)
|
|
{
|
|
const struct layerscape_sfp_data *data;
|
|
struct layerscape_sfp_priv *priv;
|
|
struct nvmem_device *nvmem;
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(priv->base))
|
|
return PTR_ERR(priv->base);
|
|
|
|
data = device_get_match_data(&pdev->dev);
|
|
|
|
layerscape_sfp_nvmem_config.size = data->size;
|
|
layerscape_sfp_nvmem_config.dev = &pdev->dev;
|
|
layerscape_sfp_nvmem_config.priv = priv;
|
|
|
|
nvmem = devm_nvmem_register(&pdev->dev, &layerscape_sfp_nvmem_config);
|
|
|
|
return PTR_ERR_OR_ZERO(nvmem);
|
|
}
|
|
|
|
static const struct layerscape_sfp_data ls1028a_data = {
|
|
.size = 0x88,
|
|
};
|
|
|
|
static const struct of_device_id layerscape_sfp_dt_ids[] = {
|
|
{ .compatible = "fsl,ls1028a-sfp", .data = &ls1028a_data },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, layerscape_sfp_dt_ids);
|
|
|
|
static struct platform_driver layerscape_sfp_driver = {
|
|
.probe = layerscape_sfp_probe,
|
|
.driver = {
|
|
.name = "layerscape_sfp",
|
|
.of_match_table = layerscape_sfp_dt_ids,
|
|
},
|
|
};
|
|
module_platform_driver(layerscape_sfp_driver);
|
|
|
|
MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
|
|
MODULE_DESCRIPTION("Layerscape Security Fuse Processor driver");
|
|
MODULE_LICENSE("GPL");
|