2 * UniPhier eFuse driver
4 * Copyright (C) 2017 Socionext Inc.
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.
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.
16 #include <linux/device.h>
18 #include <linux/module.h>
19 #include <linux/mod_devicetable.h>
20 #include <linux/nvmem-provider.h>
21 #include <linux/platform_device.h>
23 struct uniphier_efuse_priv {
27 static int uniphier_reg_read(void *context,
28 unsigned int reg, void *_val, size_t bytes)
30 struct uniphier_efuse_priv *priv = context;
34 for (offs = 0; offs < bytes; offs += sizeof(u8))
35 *val++ = readb(priv->base + reg + offs);
40 static int uniphier_efuse_probe(struct platform_device *pdev)
42 struct device *dev = &pdev->dev;
44 struct nvmem_device *nvmem;
45 struct nvmem_config econfig = {};
46 struct uniphier_efuse_priv *priv;
48 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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);
58 econfig.word_size = 1;
59 econfig.read_only = true;
60 econfig.reg_read = uniphier_reg_read;
61 econfig.size = resource_size(res);
64 nvmem = devm_nvmem_register(dev, &econfig);
66 return PTR_ERR_OR_ZERO(nvmem);
69 static const struct of_device_id uniphier_efuse_of_match[] = {
70 { .compatible = "socionext,uniphier-efuse",},
73 MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);
75 static struct platform_driver uniphier_efuse_driver = {
76 .probe = uniphier_efuse_probe,
78 .name = "uniphier-efuse",
79 .of_match_table = uniphier_efuse_of_match,
82 module_platform_driver(uniphier_efuse_driver);
84 MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
85 MODULE_DESCRIPTION("UniPhier eFuse driver");
86 MODULE_LICENSE("GPL v2");