1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * UniPhier eFuse driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2017 Socionext Inc.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/device.h>
9*4882a593Smuzhiyun #include <linux/io.h>
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/mod_devicetable.h>
12*4882a593Smuzhiyun #include <linux/nvmem-provider.h>
13*4882a593Smuzhiyun #include <linux/platform_device.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun struct uniphier_efuse_priv {
16*4882a593Smuzhiyun void __iomem *base;
17*4882a593Smuzhiyun };
18*4882a593Smuzhiyun
uniphier_reg_read(void * context,unsigned int reg,void * _val,size_t bytes)19*4882a593Smuzhiyun static int uniphier_reg_read(void *context,
20*4882a593Smuzhiyun unsigned int reg, void *_val, size_t bytes)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun struct uniphier_efuse_priv *priv = context;
23*4882a593Smuzhiyun u8 *val = _val;
24*4882a593Smuzhiyun int offs;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun for (offs = 0; offs < bytes; offs += sizeof(u8))
27*4882a593Smuzhiyun *val++ = readb(priv->base + reg + offs);
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun return 0;
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun
uniphier_efuse_probe(struct platform_device * pdev)32*4882a593Smuzhiyun static int uniphier_efuse_probe(struct platform_device *pdev)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun struct device *dev = &pdev->dev;
35*4882a593Smuzhiyun struct resource *res;
36*4882a593Smuzhiyun struct nvmem_device *nvmem;
37*4882a593Smuzhiyun struct nvmem_config econfig = {};
38*4882a593Smuzhiyun struct uniphier_efuse_priv *priv;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
41*4882a593Smuzhiyun if (!priv)
42*4882a593Smuzhiyun return -ENOMEM;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
45*4882a593Smuzhiyun priv->base = devm_ioremap_resource(dev, res);
46*4882a593Smuzhiyun if (IS_ERR(priv->base))
47*4882a593Smuzhiyun return PTR_ERR(priv->base);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun econfig.stride = 1;
50*4882a593Smuzhiyun econfig.word_size = 1;
51*4882a593Smuzhiyun econfig.read_only = true;
52*4882a593Smuzhiyun econfig.reg_read = uniphier_reg_read;
53*4882a593Smuzhiyun econfig.size = resource_size(res);
54*4882a593Smuzhiyun econfig.priv = priv;
55*4882a593Smuzhiyun econfig.dev = dev;
56*4882a593Smuzhiyun nvmem = devm_nvmem_register(dev, &econfig);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun return PTR_ERR_OR_ZERO(nvmem);
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun static const struct of_device_id uniphier_efuse_of_match[] = {
62*4882a593Smuzhiyun { .compatible = "socionext,uniphier-efuse",},
63*4882a593Smuzhiyun {/* sentinel */},
64*4882a593Smuzhiyun };
65*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun static struct platform_driver uniphier_efuse_driver = {
68*4882a593Smuzhiyun .probe = uniphier_efuse_probe,
69*4882a593Smuzhiyun .driver = {
70*4882a593Smuzhiyun .name = "uniphier-efuse",
71*4882a593Smuzhiyun .of_match_table = uniphier_efuse_of_match,
72*4882a593Smuzhiyun },
73*4882a593Smuzhiyun };
74*4882a593Smuzhiyun module_platform_driver(uniphier_efuse_driver);
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
77*4882a593Smuzhiyun MODULE_DESCRIPTION("UniPhier eFuse driver");
78*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
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