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97 lines
2.1 KiB
97 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015 MediaTek Inc. |
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* Author: Andrew-CT Chen <[email protected]> |
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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_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.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 <[email protected]>"); |
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MODULE_DESCRIPTION("Mediatek EFUSE driver"); |
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MODULE_LICENSE("GPL v2");
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