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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> | |
ac316725 | 17 | #include <linux/mod_devicetable.h> |
ba360fd0 | 18 | #include <linux/io.h> |
4c7e4fe3 ACC |
19 | #include <linux/nvmem-provider.h> |
20 | #include <linux/platform_device.h> | |
4c7e4fe3 | 21 | |
a48f1fff MY |
22 | struct mtk_efuse_priv { |
23 | void __iomem *base; | |
24 | }; | |
25 | ||
ba360fd0 SK |
26 | static int mtk_reg_read(void *context, |
27 | unsigned int reg, void *_val, size_t bytes) | |
28 | { | |
a48f1fff | 29 | struct mtk_efuse_priv *priv = context; |
ba360fd0 SK |
30 | u32 *val = _val; |
31 | int i = 0, words = bytes / 4; | |
32 | ||
33 | while (words--) | |
a48f1fff | 34 | *val++ = readl(priv->base + reg + (i++ * 4)); |
ba360fd0 SK |
35 | |
36 | return 0; | |
37 | } | |
38 | ||
39 | static int mtk_reg_write(void *context, | |
40 | unsigned int reg, void *_val, size_t bytes) | |
41 | { | |
a48f1fff | 42 | struct mtk_efuse_priv *priv = context; |
ba360fd0 SK |
43 | u32 *val = _val; |
44 | int i = 0, words = bytes / 4; | |
45 | ||
46 | while (words--) | |
a48f1fff | 47 | writel(*val++, priv->base + reg + (i++ * 4)); |
ba360fd0 SK |
48 | |
49 | return 0; | |
50 | } | |
4c7e4fe3 ACC |
51 | |
52 | static int mtk_efuse_probe(struct platform_device *pdev) | |
53 | { | |
54 | struct device *dev = &pdev->dev; | |
55 | struct resource *res; | |
56 | struct nvmem_device *nvmem; | |
4dd5f60e | 57 | struct nvmem_config econfig = {}; |
a48f1fff MY |
58 | struct mtk_efuse_priv *priv; |
59 | ||
60 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
61 | if (!priv) | |
62 | return -ENOMEM; | |
4c7e4fe3 ACC |
63 | |
64 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
a48f1fff MY |
65 | priv->base = devm_ioremap_resource(dev, res); |
66 | if (IS_ERR(priv->base)) | |
67 | return PTR_ERR(priv->base); | |
4c7e4fe3 | 68 | |
4dd5f60e MY |
69 | econfig.stride = 4; |
70 | econfig.word_size = 4; | |
71 | econfig.reg_read = mtk_reg_read; | |
72 | econfig.reg_write = mtk_reg_write; | |
73 | econfig.size = resource_size(res); | |
a48f1fff | 74 | econfig.priv = priv; |
4dd5f60e | 75 | econfig.dev = dev; |
7e68a645 | 76 | nvmem = devm_nvmem_register(dev, &econfig); |
4c7e4fe3 | 77 | |
7e68a645 | 78 | return PTR_ERR_OR_ZERO(nvmem); |
4c7e4fe3 ACC |
79 | } |
80 | ||
81 | static const struct of_device_id mtk_efuse_of_match[] = { | |
82 | { .compatible = "mediatek,mt8173-efuse",}, | |
83 | { .compatible = "mediatek,efuse",}, | |
84 | {/* sentinel */}, | |
85 | }; | |
86 | MODULE_DEVICE_TABLE(of, mtk_efuse_of_match); | |
87 | ||
88 | static struct platform_driver mtk_efuse_driver = { | |
89 | .probe = mtk_efuse_probe, | |
4c7e4fe3 ACC |
90 | .driver = { |
91 | .name = "mediatek,efuse", | |
92 | .of_match_table = mtk_efuse_of_match, | |
93 | }, | |
94 | }; | |
564e7f87 ACC |
95 | |
96 | static int __init mtk_efuse_init(void) | |
97 | { | |
98 | int ret; | |
99 | ||
100 | ret = platform_driver_register(&mtk_efuse_driver); | |
101 | if (ret) { | |
102 | pr_err("Failed to register efuse driver\n"); | |
103 | return ret; | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static void __exit mtk_efuse_exit(void) | |
110 | { | |
111 | return platform_driver_unregister(&mtk_efuse_driver); | |
112 | } | |
113 | ||
114 | subsys_initcall(mtk_efuse_init); | |
115 | module_exit(mtk_efuse_exit); | |
116 | ||
4c7e4fe3 ACC |
117 | MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>"); |
118 | MODULE_DESCRIPTION("Mediatek EFUSE driver"); | |
119 | MODULE_LICENSE("GPL v2"); |