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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
71c5dd50 KH |
2 | /* |
3 | * UniPhier eFuse driver | |
4 | * | |
5 | * Copyright (C) 2017 Socionext Inc. | |
71c5dd50 KH |
6 | */ |
7 | ||
8 | #include <linux/device.h> | |
9 | #include <linux/io.h> | |
10 | #include <linux/module.h> | |
ac316725 | 11 | #include <linux/mod_devicetable.h> |
71c5dd50 KH |
12 | #include <linux/nvmem-provider.h> |
13 | #include <linux/platform_device.h> | |
14 | ||
15 | struct uniphier_efuse_priv { | |
16 | void __iomem *base; | |
17 | }; | |
18 | ||
19 | static int uniphier_reg_read(void *context, | |
20 | unsigned int reg, void *_val, size_t bytes) | |
21 | { | |
22 | struct uniphier_efuse_priv *priv = context; | |
683618b0 | 23 | u8 *val = _val; |
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24 | int offs; |
25 | ||
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26 | for (offs = 0; offs < bytes; offs += sizeof(u8)) |
27 | *val++ = readb(priv->base + reg + offs); | |
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28 | |
29 | return 0; | |
30 | } | |
31 | ||
32 | static int uniphier_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 uniphier_efuse_priv *priv; | |
39 | ||
40 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
41 | if (!priv) | |
42 | return -ENOMEM; | |
43 | ||
44 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
45 | priv->base = devm_ioremap_resource(dev, res); | |
46 | if (IS_ERR(priv->base)) | |
47 | return PTR_ERR(priv->base); | |
48 | ||
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49 | econfig.stride = 1; |
50 | econfig.word_size = 1; | |
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51 | econfig.read_only = true; |
52 | econfig.reg_read = uniphier_reg_read; | |
53 | econfig.size = resource_size(res); | |
54 | econfig.priv = priv; | |
55 | econfig.dev = dev; | |
45ff8ef7 | 56 | nvmem = devm_nvmem_register(dev, &econfig); |
71c5dd50 | 57 | |
45ff8ef7 | 58 | return PTR_ERR_OR_ZERO(nvmem); |
71c5dd50 KH |
59 | } |
60 | ||
61 | static const struct of_device_id uniphier_efuse_of_match[] = { | |
62 | { .compatible = "socionext,uniphier-efuse",}, | |
63 | {/* sentinel */}, | |
64 | }; | |
65 | MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match); | |
66 | ||
67 | static struct platform_driver uniphier_efuse_driver = { | |
68 | .probe = uniphier_efuse_probe, | |
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69 | .driver = { |
70 | .name = "uniphier-efuse", | |
71 | .of_match_table = uniphier_efuse_of_match, | |
72 | }, | |
73 | }; | |
74 | module_platform_driver(uniphier_efuse_driver); | |
75 | ||
76 | MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>"); | |
77 | MODULE_DESCRIPTION("UniPhier eFuse driver"); | |
78 | MODULE_LICENSE("GPL v2"); |