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// SPDX-License-Identifier: GPL-2.0-only
/*
* Renesas R-Car E-FUSE/OTP Driver
*
* Copyright (C) 2024 Glider bv
*/
#include <linux/device.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/nvmem-provider.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
struct rcar_fuse {
struct nvmem_keepout keepouts[2];
struct nvmem_device *nvmem;
struct device *dev;
void __iomem *base;
};
struct rcar_fuse_data {
unsigned int bank; /* 0: PFC + E-FUSE, 1: OPT_MEM + E-FUSE */
unsigned int start; /* inclusive */
unsigned int end; /* exclusive */
};
static int rcar_fuse_reg_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct rcar_fuse *fuse = priv;
int ret;
ret = pm_runtime_resume_and_get(fuse->dev);
if (ret < 0)
return ret;
__ioread32_copy(val, fuse->base + offset, bytes / 4);
pm_runtime_put(fuse->dev);
return 0;
}
static int rcar_fuse_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct rcar_fuse_data *data = device_get_match_data(dev);
struct nvmem_config config = {
.dev = dev,
.name = "rcar-fuse",
.id = NVMEM_DEVID_NONE,
.owner = THIS_MODULE,
.type = NVMEM_TYPE_OTP,
.read_only = true,
.root_only = true,
.reg_read = rcar_fuse_reg_read,
.word_size = 4,
.stride = 4,
};
struct rcar_fuse *fuse;
struct resource *res;
int ret;
ret = devm_pm_runtime_enable(dev);
if (ret < 0)
return ret;
fuse = devm_kzalloc(dev, sizeof(*fuse), GFP_KERNEL);
if (!fuse)
return -ENOMEM;
fuse->base = devm_platform_get_and_ioremap_resource(pdev, data->bank,
&res);
if (IS_ERR(fuse->base))
return PTR_ERR(fuse->base);
fuse->dev = dev;
fuse->keepouts[0].start = 0;
fuse->keepouts[0].end = data->start;
fuse->keepouts[1].start = data->end;
fuse->keepouts[1].end = resource_size(res);
config.keepout = fuse->keepouts;
config.nkeepout = ARRAY_SIZE(fuse->keepouts);
config.size = resource_size(res);
config.priv = fuse;
fuse->nvmem = devm_nvmem_register(dev, &config);
if (IS_ERR(fuse->nvmem))
return dev_err_probe(dev, PTR_ERR(fuse->nvmem),
"Failed to register NVMEM device\n");
return 0;
}
static const struct rcar_fuse_data rcar_fuse_v3u = {
.bank = 0,
.start = 0x0c0,
.end = 0x0e8,
};
static const struct rcar_fuse_data rcar_fuse_s4 = {
.bank = 0,
.start = 0x0c0,
.end = 0x14c,
};
static const struct rcar_fuse_data rcar_fuse_v4h = {
.bank = 1,
.start = 0x100,
.end = 0x1a0,
};
static const struct rcar_fuse_data rcar_fuse_v4m = {
.bank = 1,
.start = 0x100,
.end = 0x110,
};
static const struct of_device_id rcar_fuse_match[] = {
{ .compatible = "renesas,r8a779a0-efuse", .data = &rcar_fuse_v3u },
{ .compatible = "renesas,r8a779f0-efuse", .data = &rcar_fuse_s4 },
{ .compatible = "renesas,r8a779g0-otp", .data = &rcar_fuse_v4h },
{ .compatible = "renesas,r8a779h0-otp", .data = &rcar_fuse_v4m },
{ /* sentinel */ }
};
static struct platform_driver rcar_fuse_driver = {
.probe = rcar_fuse_probe,
.driver = {
.name = "rcar_fuse",
.of_match_table = rcar_fuse_match,
},
};
module_platform_driver(rcar_fuse_driver);
MODULE_DESCRIPTION("Renesas R-Car E-FUSE/OTP driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Geert Uytterhoeven");
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