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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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683618b063
The efuse on UniPhier allows 8bit access according to the specification. Since bit offset of nvmem is limited to 0-7, it is desiable to change access unit of nvmem to 8bit. Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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* UniPhier eFuse driver
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*
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* Copyright (C) 2017 Socionext Inc.
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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/io.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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struct uniphier_efuse_priv {
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void __iomem *base;
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};
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static int uniphier_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 uniphier_efuse_priv *priv = context;
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u8 *val = _val;
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int offs;
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for (offs = 0; offs < bytes; offs += sizeof(u8))
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*val++ = readb(priv->base + reg + offs);
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return 0;
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}
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static int uniphier_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 uniphier_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 = 1;
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econfig.word_size = 1;
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econfig.read_only = true;
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econfig.reg_read = uniphier_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 = nvmem_register(&econfig);
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if (IS_ERR(nvmem))
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return PTR_ERR(nvmem);
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platform_set_drvdata(pdev, nvmem);
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return 0;
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}
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static int uniphier_efuse_remove(struct platform_device *pdev)
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{
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struct nvmem_device *nvmem = platform_get_drvdata(pdev);
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return nvmem_unregister(nvmem);
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}
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static const struct of_device_id uniphier_efuse_of_match[] = {
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{ .compatible = "socionext,uniphier-efuse",},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);
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static struct platform_driver uniphier_efuse_driver = {
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.probe = uniphier_efuse_probe,
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.remove = uniphier_efuse_remove,
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.driver = {
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.name = "uniphier-efuse",
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.of_match_table = uniphier_efuse_of_match,
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},
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};
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module_platform_driver(uniphier_efuse_driver);
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MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
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MODULE_DESCRIPTION("UniPhier eFuse driver");
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MODULE_LICENSE("GPL v2");
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