mirror of https://gitee.com/openkylin/linux.git
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
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* Copyright (c) 2015 MediaTek Inc.
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* Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/io.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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struct mtk_efuse_priv {
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void __iomem *base;
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};
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static int mtk_reg_read(void *context,
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unsigned int reg, void *_val, size_t bytes)
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{
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struct mtk_efuse_priv *priv = context;
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u32 *val = _val;
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int i = 0, words = bytes / 4;
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while (words--)
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*val++ = readl(priv->base + reg + (i++ * 4));
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return 0;
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}
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static int mtk_reg_write(void *context,
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unsigned int reg, void *_val, size_t bytes)
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{
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struct mtk_efuse_priv *priv = context;
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u32 *val = _val;
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int i = 0, words = bytes / 4;
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while (words--)
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writel(*val++, priv->base + reg + (i++ * 4));
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return 0;
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}
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static int mtk_efuse_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct nvmem_device *nvmem;
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struct nvmem_config econfig = {};
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struct mtk_efuse_priv *priv;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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econfig.stride = 4;
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econfig.word_size = 4;
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econfig.reg_read = mtk_reg_read;
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econfig.reg_write = mtk_reg_write;
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econfig.size = resource_size(res);
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econfig.priv = priv;
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econfig.dev = dev;
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nvmem = devm_nvmem_register(dev, &econfig);
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return PTR_ERR_OR_ZERO(nvmem);
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}
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static const struct of_device_id mtk_efuse_of_match[] = {
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{ .compatible = "mediatek,mt8173-efuse",},
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{ .compatible = "mediatek,efuse",},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);
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static struct platform_driver mtk_efuse_driver = {
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.probe = mtk_efuse_probe,
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.driver = {
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.name = "mediatek,efuse",
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.of_match_table = mtk_efuse_of_match,
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},
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};
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static int __init mtk_efuse_init(void)
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{
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int ret;
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ret = platform_driver_register(&mtk_efuse_driver);
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if (ret) {
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pr_err("Failed to register efuse driver\n");
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return ret;
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}
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return 0;
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}
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static void __exit mtk_efuse_exit(void)
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{
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return platform_driver_unregister(&mtk_efuse_driver);
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}
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subsys_initcall(mtk_efuse_init);
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module_exit(mtk_efuse_exit);
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MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
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MODULE_DESCRIPTION("Mediatek EFUSE driver");
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MODULE_LICENSE("GPL v2");
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