1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * UniPhier eFuse driver |
4 | * |
5 | * Copyright (C) 2017 Socionext Inc. |
6 | */ |
7 | |
8 | #include <linux/device.h> |
9 | #include <linux/io.h> |
10 | #include <linux/module.h> |
11 | #include <linux/mod_devicetable.h> |
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; |
23 | u8 *val = _val; |
24 | int offs; |
25 | |
26 | for (offs = 0; offs < bytes; offs += sizeof(u8)) |
27 | *val++ = readb(addr: priv->base + reg + offs); |
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, size: sizeof(*priv), GFP_KERNEL); |
41 | if (!priv) |
42 | return -ENOMEM; |
43 | |
44 | priv->base = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &res); |
45 | if (IS_ERR(ptr: priv->base)) |
46 | return PTR_ERR(ptr: priv->base); |
47 | |
48 | econfig.stride = 1; |
49 | econfig.word_size = 1; |
50 | econfig.read_only = true; |
51 | econfig.reg_read = uniphier_reg_read; |
52 | econfig.size = resource_size(res); |
53 | econfig.priv = priv; |
54 | econfig.dev = dev; |
55 | econfig.add_legacy_fixed_of_cells = true; |
56 | nvmem = devm_nvmem_register(dev, cfg: &econfig); |
57 | |
58 | return PTR_ERR_OR_ZERO(ptr: nvmem); |
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, |
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" ); |
79 | |