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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2023-2025 NXP
*/
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
struct s32g_ocotp_priv {
struct device *dev;
void __iomem *base;
};
static int s32g_ocotp_read(void *context, unsigned int offset,
void *val, size_t bytes)
{
struct s32g_ocotp_priv *s32g_data = context;
u32 *dst = val;
while (bytes >= sizeof(u32)) {
*dst++ = ioread32(s32g_data->base + offset);
bytes -= sizeof(u32);
offset += sizeof(u32);
}
return 0;
}
static struct nvmem_keepout s32g_keepouts[] = {
{ .start = 0, .end = 520 },
{ .start = 540, .end = 564 },
{ .start = 596, .end = 664 },
{ .start = 668, .end = 676 },
{ .start = 684, .end = 732 },
{ .start = 744, .end = 864 },
{ .start = 908, .end = 924 },
{ .start = 928, .end = 936 },
{ .start = 948, .end = 964 },
{ .start = 968, .end = 976 },
{ .start = 984, .end = 1012 },
};
static struct nvmem_config s32g_ocotp_nvmem_config = {
.name = "s32g-ocotp",
.add_legacy_fixed_of_cells = true,
.read_only = true,
.word_size = 4,
.reg_read = s32g_ocotp_read,
.keepout = s32g_keepouts,
.nkeepout = ARRAY_SIZE(s32g_keepouts),
};
static const struct of_device_id ocotp_of_match[] = {
{ .compatible = "nxp,s32g2-ocotp" },
{ /* sentinel */ }
};
static int s32g_ocotp_probe(struct platform_device *pdev)
{
struct s32g_ocotp_priv *s32g_data;
struct device *dev = &pdev->dev;
struct nvmem_device *nvmem;
struct resource *res;
s32g_data = devm_kzalloc(dev, sizeof(*s32g_data), GFP_KERNEL);
if (!s32g_data)
return -ENOMEM;
s32g_data->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(s32g_data->base))
return dev_err_probe(dev, PTR_ERR(s32g_data->base),
"Cannot map OCOTP device.\n");
s32g_data->dev = dev;
s32g_ocotp_nvmem_config.dev = dev;
s32g_ocotp_nvmem_config.priv = s32g_data;
s32g_ocotp_nvmem_config.size = resource_size(res);
nvmem = devm_nvmem_register(dev, &s32g_ocotp_nvmem_config);
return PTR_ERR_OR_ZERO(nvmem);
}
static struct platform_driver s32g_ocotp_driver = {
.probe = s32g_ocotp_probe,
.driver = {
.name = "s32g-ocotp",
.of_match_table = ocotp_of_match,
},
};
module_platform_driver(s32g_ocotp_driver);
MODULE_AUTHOR("NXP");
MODULE_DESCRIPTION("S32G OCOTP driver");
MODULE_LICENSE("GPL");
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