1 // SPDX-License-Identifier: GPL-2.0-only
3 * Layerscape SFP driver
5 * Copyright (c) 2022 Michael Walle <michael@walle.cc>
9 #include <linux/device.h>
11 #include <linux/mod_devicetable.h>
12 #include <linux/module.h>
13 #include <linux/nvmem-provider.h>
14 #include <linux/platform_device.h>
15 #include <linux/property.h>
17 #define LAYERSCAPE_SFP_OTP_OFFSET 0x0200
19 struct layerscape_sfp_priv {
23 struct layerscape_sfp_data {
27 static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
30 struct layerscape_sfp_priv *priv = context;
32 memcpy_fromio(val, priv->base + LAYERSCAPE_SFP_OTP_OFFSET + offset,
38 static struct nvmem_config layerscape_sfp_nvmem_config = {
40 .reg_read = layerscape_sfp_read,
43 static int layerscape_sfp_probe(struct platform_device *pdev)
45 const struct layerscape_sfp_data *data;
46 struct layerscape_sfp_priv *priv;
47 struct nvmem_device *nvmem;
49 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
53 priv->base = devm_platform_ioremap_resource(pdev, 0);
54 if (IS_ERR(priv->base))
55 return PTR_ERR(priv->base);
57 data = device_get_match_data(&pdev->dev);
59 layerscape_sfp_nvmem_config.size = data->size;
60 layerscape_sfp_nvmem_config.dev = &pdev->dev;
61 layerscape_sfp_nvmem_config.priv = priv;
63 nvmem = devm_nvmem_register(&pdev->dev, &layerscape_sfp_nvmem_config);
65 return PTR_ERR_OR_ZERO(nvmem);
68 static const struct layerscape_sfp_data ls1028a_data = {
72 static const struct of_device_id layerscape_sfp_dt_ids[] = {
73 { .compatible = "fsl,ls1028a-sfp", .data = &ls1028a_data },
76 MODULE_DEVICE_TABLE(of, layerscape_sfp_dt_ids);
78 static struct platform_driver layerscape_sfp_driver = {
79 .probe = layerscape_sfp_probe,
81 .name = "layerscape_sfp",
82 .of_match_table = layerscape_sfp_dt_ids,
85 module_platform_driver(layerscape_sfp_driver);
87 MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
88 MODULE_DESCRIPTION("Layerscape Security Fuse Processor driver");
89 MODULE_LICENSE("GPL");