cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

uniphier-efuse.c (1914B)

      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
     15struct uniphier_efuse_priv {
     16	void __iomem *base;
     17};
     18
     19static 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(priv->base + reg + offs);
     28
     29	return 0;
     30}
     31
     32static 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
     49	econfig.stride = 1;
     50	econfig.word_size = 1;
     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;
     56	nvmem = devm_nvmem_register(dev, &econfig);
     57
     58	return PTR_ERR_OR_ZERO(nvmem);
     59}
     60
     61static const struct of_device_id uniphier_efuse_of_match[] = {
     62	{ .compatible = "socionext,uniphier-efuse",},
     63	{/* sentinel */},
     64};
     65MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);
     66
     67static 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};
     74module_platform_driver(uniphier_efuse_driver);
     75
     76MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
     77MODULE_DESCRIPTION("UniPhier eFuse driver");
     78MODULE_LICENSE("GPL v2");