// SPDX-License-Identifier: GPL-2.0+
|
/*
|
* Allwinner sunXi SoCs Security ID support.
|
*
|
* Copyright (c) 2013 Oliver Schinagl <oliver@schinagl.nl>
|
* Copyright (C) 2014 Maxime Ripard <maxime.ripard@free-electrons.com>
|
*/
|
|
#include <linux/device.h>
|
#include <linux/io.h>
|
#include <linux/iopoll.h>
|
#include <linux/module.h>
|
#include <linux/nvmem-provider.h>
|
#include <linux/of.h>
|
#include <linux/of_device.h>
|
#include <linux/platform_device.h>
|
#include <linux/slab.h>
|
#include <linux/random.h>
|
|
struct sunxi_sid_cfg {
|
u32 value_offset;
|
u32 size;
|
};
|
|
struct sunxi_sid {
|
void __iomem *base;
|
u32 value_offset;
|
};
|
|
static int sunxi_sid_read(void *context, unsigned int offset,
|
void *val, size_t bytes)
|
{
|
struct sunxi_sid *sid = context;
|
|
memcpy_fromio(val, sid->base + sid->value_offset + offset, bytes);
|
|
return 0;
|
}
|
|
static int sunxi_sid_probe(struct platform_device *pdev)
|
{
|
struct device *dev = &pdev->dev;
|
struct resource *res;
|
struct nvmem_config *nvmem_cfg;
|
struct nvmem_device *nvmem;
|
struct sunxi_sid *sid;
|
int size;
|
char *randomness;
|
const struct sunxi_sid_cfg *cfg;
|
|
sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);
|
if (!sid)
|
return -ENOMEM;
|
|
cfg = of_device_get_match_data(dev);
|
if (!cfg)
|
return -EINVAL;
|
sid->value_offset = cfg->value_offset;
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
sid->base = devm_ioremap_resource(dev, res);
|
if (IS_ERR(sid->base))
|
return PTR_ERR(sid->base);
|
|
size = cfg->size;
|
|
nvmem_cfg = devm_kzalloc(dev, sizeof(*nvmem_cfg), GFP_KERNEL);
|
if (!nvmem_cfg)
|
return -ENOMEM;
|
|
nvmem_cfg->dev = dev;
|
nvmem_cfg->name = "sunxi-sid";
|
nvmem_cfg->read_only = true;
|
nvmem_cfg->size = cfg->size;
|
nvmem_cfg->word_size = 1;
|
nvmem_cfg->stride = 4;
|
nvmem_cfg->priv = sid;
|
nvmem_cfg->reg_read = sunxi_sid_read;
|
|
nvmem = nvmem_register(nvmem_cfg);
|
if (IS_ERR(nvmem))
|
return PTR_ERR(nvmem);
|
|
randomness = kzalloc(size, GFP_KERNEL);
|
if (!randomness)
|
return -ENOMEM;
|
|
nvmem_cfg->reg_read(sid, 0, randomness, size);
|
add_device_randomness(randomness, size);
|
kfree(randomness);
|
|
platform_set_drvdata(pdev, nvmem);
|
|
return 0;
|
}
|
|
static int sunxi_sid_remove(struct platform_device *pdev)
|
{
|
struct nvmem_device *nvmem = platform_get_drvdata(pdev);
|
|
return nvmem_unregister(nvmem);
|
}
|
|
static const struct sunxi_sid_cfg sun50iw9p1_cfg = {
|
.value_offset = 0x200,
|
.size = 0x100,
|
};
|
|
static const struct of_device_id sunxi_sid_of_match[] = {
|
{ .compatible = "allwinner,sun50iw9p1-sid", .data = &sun50iw9p1_cfg },
|
{ .compatible = "allwinner,sun50iw10p1-sid", .data = &sun50iw9p1_cfg },
|
{/* sentinel */},
|
};
|
MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);
|
|
static struct platform_driver sunxi_sid_driver = {
|
.probe = sunxi_sid_probe,
|
.remove = sunxi_sid_remove,
|
.driver = {
|
.name = "eeprom-sunxi-sid",
|
.of_match_table = sunxi_sid_of_match,
|
},
|
};
|
module_platform_driver(sunxi_sid_driver);
|
|
MODULE_AUTHOR("Oliver Schinagl <oliver@schinagl.nl>");
|
MODULE_DESCRIPTION("Allwinner sunxi security id driver");
|
MODULE_LICENSE("GPL");
|
