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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2015 MediaTek Inc.
4 * Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
5 */
6
7#include <linux/device.h>
8#include <linux/module.h>
9#include <linux/mod_devicetable.h>
10#include <linux/io.h>
11#include <linux/nvmem-provider.h>
12#include <linux/platform_device.h>
13
14struct mtk_efuse_priv {
15 void __iomem *base;
16};
17
18static int mtk_reg_read(void *context,
19 unsigned int reg, void *_val, size_t bytes)
20{
21 struct mtk_efuse_priv *priv = context;
22 void __iomem *addr = priv->base + reg;
23 u8 *val = _val;
24 int i;
25
26 for (i = 0; i < bytes; i++, val++)
27 *val = readb(addr + i);
28
29 return 0;
30}
31
32static int mtk_efuse_probe(struct platform_device *pdev)
33{
34 struct device *dev = &pdev->dev;
35 struct resource *res;
36 struct nvmem_device *nvmem;
37 struct nvmem_config econfig = {};
38 struct mtk_efuse_priv *priv;
39
40 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
41 if (!priv)
42 return -ENOMEM;
43
44 priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
45 if (IS_ERR(priv->base))
46 return PTR_ERR(priv->base);
47
48 econfig.stride = 1;
49 econfig.word_size = 1;
50 econfig.reg_read = mtk_reg_read;
51 econfig.size = resource_size(res);
52 econfig.priv = priv;
53 econfig.dev = dev;
54 nvmem = devm_nvmem_register(dev, &econfig);
55
56 return PTR_ERR_OR_ZERO(nvmem);
57}
58
59static const struct of_device_id mtk_efuse_of_match[] = {
60 { .compatible = "mediatek,mt8173-efuse",},
61 { .compatible = "mediatek,efuse",},
62 {/* sentinel */},
63};
64MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);
65
66static struct platform_driver mtk_efuse_driver = {
67 .probe = mtk_efuse_probe,
68 .driver = {
69 .name = "mediatek,efuse",
70 .of_match_table = mtk_efuse_of_match,
71 },
72};
73
74static int __init mtk_efuse_init(void)
75{
76 int ret;
77
78 ret = platform_driver_register(&mtk_efuse_driver);
79 if (ret) {
80 pr_err("Failed to register efuse driver\n");
81 return ret;
82 }
83
84 return 0;
85}
86
87static void __exit mtk_efuse_exit(void)
88{
89 return platform_driver_unregister(&mtk_efuse_driver);
90}
91
92subsys_initcall(mtk_efuse_init);
93module_exit(mtk_efuse_exit);
94
95MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
96MODULE_DESCRIPTION("Mediatek EFUSE driver");
97MODULE_LICENSE("GPL v2");
1/*
2 * Copyright (c) 2015 MediaTek Inc.
3 * Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/device.h>
16#include <linux/module.h>
17#include <linux/nvmem-provider.h>
18#include <linux/platform_device.h>
19#include <linux/regmap.h>
20
21static struct regmap_config mtk_regmap_config = {
22 .reg_bits = 32,
23 .val_bits = 32,
24 .reg_stride = 4,
25};
26
27static int mtk_efuse_probe(struct platform_device *pdev)
28{
29 struct device *dev = &pdev->dev;
30 struct resource *res;
31 struct nvmem_device *nvmem;
32 struct nvmem_config *econfig;
33 struct regmap *regmap;
34 void __iomem *base;
35
36 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
37 base = devm_ioremap_resource(dev, res);
38 if (IS_ERR(base))
39 return PTR_ERR(base);
40
41 econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
42 if (!econfig)
43 return -ENOMEM;
44
45 mtk_regmap_config.max_register = resource_size(res) - 1;
46
47 regmap = devm_regmap_init_mmio(dev, base, &mtk_regmap_config);
48 if (IS_ERR(regmap)) {
49 dev_err(dev, "regmap init failed\n");
50 return PTR_ERR(regmap);
51 }
52
53 econfig->dev = dev;
54 econfig->owner = THIS_MODULE;
55 nvmem = nvmem_register(econfig);
56 if (IS_ERR(nvmem))
57 return PTR_ERR(nvmem);
58
59 platform_set_drvdata(pdev, nvmem);
60
61 return 0;
62}
63
64static int mtk_efuse_remove(struct platform_device *pdev)
65{
66 struct nvmem_device *nvmem = platform_get_drvdata(pdev);
67
68 return nvmem_unregister(nvmem);
69}
70
71static const struct of_device_id mtk_efuse_of_match[] = {
72 { .compatible = "mediatek,mt8173-efuse",},
73 { .compatible = "mediatek,efuse",},
74 {/* sentinel */},
75};
76MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);
77
78static struct platform_driver mtk_efuse_driver = {
79 .probe = mtk_efuse_probe,
80 .remove = mtk_efuse_remove,
81 .driver = {
82 .name = "mediatek,efuse",
83 .of_match_table = mtk_efuse_of_match,
84 },
85};
86
87static int __init mtk_efuse_init(void)
88{
89 int ret;
90
91 ret = platform_driver_register(&mtk_efuse_driver);
92 if (ret) {
93 pr_err("Failed to register efuse driver\n");
94 return ret;
95 }
96
97 return 0;
98}
99
100static void __exit mtk_efuse_exit(void)
101{
102 return platform_driver_unregister(&mtk_efuse_driver);
103}
104
105subsys_initcall(mtk_efuse_init);
106module_exit(mtk_efuse_exit);
107
108MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
109MODULE_DESCRIPTION("Mediatek EFUSE driver");
110MODULE_LICENSE("GPL v2");