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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> | |
ba360fd0 | 17 | #include <linux/io.h> |
4c7e4fe3 ACC |
18 | #include <linux/nvmem-provider.h> |
19 | #include <linux/platform_device.h> | |
4c7e4fe3 | 20 | |
ba360fd0 SK |
21 | static int mtk_reg_read(void *context, |
22 | unsigned int reg, void *_val, size_t bytes) | |
23 | { | |
24 | void __iomem *base = context; | |
25 | u32 *val = _val; | |
26 | int i = 0, words = bytes / 4; | |
27 | ||
28 | while (words--) | |
29 | *val++ = readl(base + reg + (i++ * 4)); | |
30 | ||
31 | return 0; | |
32 | } | |
33 | ||
34 | static int mtk_reg_write(void *context, | |
35 | unsigned int reg, void *_val, size_t bytes) | |
36 | { | |
37 | void __iomem *base = context; | |
38 | u32 *val = _val; | |
39 | int i = 0, words = bytes / 4; | |
40 | ||
41 | while (words--) | |
42 | writel(*val++, base + reg + (i++ * 4)); | |
43 | ||
44 | return 0; | |
45 | } | |
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46 | |
47 | static int mtk_efuse_probe(struct platform_device *pdev) | |
48 | { | |
49 | struct device *dev = &pdev->dev; | |
50 | struct resource *res; | |
51 | struct nvmem_device *nvmem; | |
52 | struct nvmem_config *econfig; | |
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53 | void __iomem *base; |
54 | ||
55 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
56 | base = devm_ioremap_resource(dev, res); | |
57 | if (IS_ERR(base)) | |
58 | return PTR_ERR(base); | |
59 | ||
60 | econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL); | |
61 | if (!econfig) | |
62 | return -ENOMEM; | |
63 | ||
ba360fd0 SK |
64 | econfig->stride = 4; |
65 | econfig->word_size = 4; | |
66 | econfig->reg_read = mtk_reg_read; | |
67 | econfig->reg_write = mtk_reg_write; | |
68 | econfig->size = resource_size(res); | |
69 | econfig->priv = base; | |
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70 | econfig->dev = dev; |
71 | econfig->owner = THIS_MODULE; | |
72 | nvmem = nvmem_register(econfig); | |
73 | if (IS_ERR(nvmem)) | |
74 | return PTR_ERR(nvmem); | |
75 | ||
76 | platform_set_drvdata(pdev, nvmem); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | static int mtk_efuse_remove(struct platform_device *pdev) | |
82 | { | |
83 | struct nvmem_device *nvmem = platform_get_drvdata(pdev); | |
84 | ||
85 | return nvmem_unregister(nvmem); | |
86 | } | |
87 | ||
88 | static const struct of_device_id mtk_efuse_of_match[] = { | |
89 | { .compatible = "mediatek,mt8173-efuse",}, | |
90 | { .compatible = "mediatek,efuse",}, | |
91 | {/* sentinel */}, | |
92 | }; | |
93 | MODULE_DEVICE_TABLE(of, mtk_efuse_of_match); | |
94 | ||
95 | static struct platform_driver mtk_efuse_driver = { | |
96 | .probe = mtk_efuse_probe, | |
97 | .remove = mtk_efuse_remove, | |
98 | .driver = { | |
99 | .name = "mediatek,efuse", | |
100 | .of_match_table = mtk_efuse_of_match, | |
101 | }, | |
102 | }; | |
564e7f87 ACC |
103 | |
104 | static int __init mtk_efuse_init(void) | |
105 | { | |
106 | int ret; | |
107 | ||
108 | ret = platform_driver_register(&mtk_efuse_driver); | |
109 | if (ret) { | |
110 | pr_err("Failed to register efuse driver\n"); | |
111 | return ret; | |
112 | } | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static void __exit mtk_efuse_exit(void) | |
118 | { | |
119 | return platform_driver_unregister(&mtk_efuse_driver); | |
120 | } | |
121 | ||
122 | subsys_initcall(mtk_efuse_init); | |
123 | module_exit(mtk_efuse_exit); | |
124 | ||
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125 | MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>"); |
126 | MODULE_DESCRIPTION("Mediatek EFUSE driver"); | |
127 | MODULE_LICENSE("GPL v2"); |