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4c7e4fe3 ACC |
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 | ||
21 | static struct regmap_config mtk_regmap_config = { | |
22 | .reg_bits = 32, | |
23 | .val_bits = 32, | |
24 | .reg_stride = 4, | |
25 | }; | |
26 | ||
27 | static 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 | ||
64 | static 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 | ||
71 | static const struct of_device_id mtk_efuse_of_match[] = { | |
72 | { .compatible = "mediatek,mt8173-efuse",}, | |
73 | { .compatible = "mediatek,efuse",}, | |
74 | {/* sentinel */}, | |
75 | }; | |
76 | MODULE_DEVICE_TABLE(of, mtk_efuse_of_match); | |
77 | ||
78 | static 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 | }; | |
564e7f87 ACC |
86 | |
87 | static 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 | ||
100 | static void __exit mtk_efuse_exit(void) | |
101 | { | |
102 | return platform_driver_unregister(&mtk_efuse_driver); | |
103 | } | |
104 | ||
105 | subsys_initcall(mtk_efuse_init); | |
106 | module_exit(mtk_efuse_exit); | |
107 | ||
4c7e4fe3 ACC |
108 | MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>"); |
109 | MODULE_DESCRIPTION("Mediatek EFUSE driver"); | |
110 | MODULE_LICENSE("GPL v2"); |