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71c5dd50 KH |
1 | /* |
2 | * UniPhier eFuse driver | |
3 | * | |
4 | * Copyright (C) 2017 Socionext Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/device.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/module.h> | |
ac316725 | 19 | #include <linux/mod_devicetable.h> |
71c5dd50 KH |
20 | #include <linux/nvmem-provider.h> |
21 | #include <linux/platform_device.h> | |
22 | ||
23 | struct uniphier_efuse_priv { | |
24 | void __iomem *base; | |
25 | }; | |
26 | ||
27 | static int uniphier_reg_read(void *context, | |
28 | unsigned int reg, void *_val, size_t bytes) | |
29 | { | |
30 | struct uniphier_efuse_priv *priv = context; | |
683618b0 | 31 | u8 *val = _val; |
71c5dd50 KH |
32 | int offs; |
33 | ||
683618b0 KH |
34 | for (offs = 0; offs < bytes; offs += sizeof(u8)) |
35 | *val++ = readb(priv->base + reg + offs); | |
71c5dd50 KH |
36 | |
37 | return 0; | |
38 | } | |
39 | ||
40 | static int uniphier_efuse_probe(struct platform_device *pdev) | |
41 | { | |
42 | struct device *dev = &pdev->dev; | |
43 | struct resource *res; | |
44 | struct nvmem_device *nvmem; | |
45 | struct nvmem_config econfig = {}; | |
46 | struct uniphier_efuse_priv *priv; | |
47 | ||
48 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
49 | if (!priv) | |
50 | return -ENOMEM; | |
51 | ||
52 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
53 | priv->base = devm_ioremap_resource(dev, res); | |
54 | if (IS_ERR(priv->base)) | |
55 | return PTR_ERR(priv->base); | |
56 | ||
683618b0 KH |
57 | econfig.stride = 1; |
58 | econfig.word_size = 1; | |
71c5dd50 KH |
59 | econfig.read_only = true; |
60 | econfig.reg_read = uniphier_reg_read; | |
61 | econfig.size = resource_size(res); | |
62 | econfig.priv = priv; | |
63 | econfig.dev = dev; | |
45ff8ef7 | 64 | nvmem = devm_nvmem_register(dev, &econfig); |
71c5dd50 | 65 | |
45ff8ef7 | 66 | return PTR_ERR_OR_ZERO(nvmem); |
71c5dd50 KH |
67 | } |
68 | ||
69 | static const struct of_device_id uniphier_efuse_of_match[] = { | |
70 | { .compatible = "socionext,uniphier-efuse",}, | |
71 | {/* sentinel */}, | |
72 | }; | |
73 | MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match); | |
74 | ||
75 | static struct platform_driver uniphier_efuse_driver = { | |
76 | .probe = uniphier_efuse_probe, | |
71c5dd50 KH |
77 | .driver = { |
78 | .name = "uniphier-efuse", | |
79 | .of_match_table = uniphier_efuse_of_match, | |
80 | }, | |
81 | }; | |
82 | module_platform_driver(uniphier_efuse_driver); | |
83 | ||
84 | MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>"); | |
85 | MODULE_DESCRIPTION("UniPhier eFuse driver"); | |
86 | MODULE_LICENSE("GPL v2"); |