1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Layerscape SFP driver
4 *
5 * Copyright (c) 2022 Michael Walle <michael@walle.cc>
6 *
7 */
8
9#include <linux/device.h>
10#include <linux/io.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>
16#include <linux/regmap.h>
17
18#define LAYERSCAPE_SFP_OTP_OFFSET 0x0200
19
20struct layerscape_sfp_priv {
21 struct regmap *regmap;
22};
23
24struct layerscape_sfp_data {
25 int size;
26 enum regmap_endian endian;
27};
28
29static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
30 size_t bytes)
31{
32 struct layerscape_sfp_priv *priv = context;
33
34 return regmap_bulk_read(map: priv->regmap,
35 LAYERSCAPE_SFP_OTP_OFFSET + offset, val,
36 val_count: bytes / 4);
37}
38
39static struct nvmem_config layerscape_sfp_nvmem_config = {
40 .name = "fsl-sfp",
41 .reg_read = layerscape_sfp_read,
42 .word_size = 4,
43 .stride = 4,
44};
45
46static int layerscape_sfp_probe(struct platform_device *pdev)
47{
48 const struct layerscape_sfp_data *data;
49 struct layerscape_sfp_priv *priv;
50 struct nvmem_device *nvmem;
51 struct regmap_config config = { 0 };
52 void __iomem *base;
53
54 priv = devm_kzalloc(dev: &pdev->dev, size: sizeof(*priv), GFP_KERNEL);
55 if (!priv)
56 return -ENOMEM;
57
58 base = devm_platform_ioremap_resource(pdev, index: 0);
59 if (IS_ERR(ptr: base))
60 return PTR_ERR(ptr: base);
61
62 data = device_get_match_data(dev: &pdev->dev);
63 config.reg_bits = 32;
64 config.reg_stride = 4;
65 config.val_bits = 32;
66 config.val_format_endian = data->endian;
67 config.max_register = LAYERSCAPE_SFP_OTP_OFFSET + data->size - 4;
68 priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, &config);
69 if (IS_ERR(ptr: priv->regmap))
70 return PTR_ERR(ptr: priv->regmap);
71
72 layerscape_sfp_nvmem_config.size = data->size;
73 layerscape_sfp_nvmem_config.dev = &pdev->dev;
74 layerscape_sfp_nvmem_config.priv = priv;
75
76 nvmem = devm_nvmem_register(dev: &pdev->dev, cfg: &layerscape_sfp_nvmem_config);
77
78 return PTR_ERR_OR_ZERO(ptr: nvmem);
79}
80
81static const struct layerscape_sfp_data ls1021a_data = {
82 .size = 0x88,
83 .endian = REGMAP_ENDIAN_BIG,
84};
85
86static const struct layerscape_sfp_data ls1028a_data = {
87 .size = 0x88,
88 .endian = REGMAP_ENDIAN_LITTLE,
89};
90
91static const struct of_device_id layerscape_sfp_dt_ids[] = {
92 { .compatible = "fsl,ls1021a-sfp", .data = &ls1021a_data },
93 { .compatible = "fsl,ls1028a-sfp", .data = &ls1028a_data },
94 {},
95};
96MODULE_DEVICE_TABLE(of, layerscape_sfp_dt_ids);
97
98static struct platform_driver layerscape_sfp_driver = {
99 .probe = layerscape_sfp_probe,
100 .driver = {
101 .name = "layerscape_sfp",
102 .of_match_table = layerscape_sfp_dt_ids,
103 },
104};
105module_platform_driver(layerscape_sfp_driver);
106
107MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
108MODULE_DESCRIPTION("Layerscape Security Fuse Processor driver");
109MODULE_LICENSE("GPL");
110

source code of linux/drivers/nvmem/layerscape-sfp.c