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78 lines
1.9 KiB
78 lines
1.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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#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/mod_devicetable.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 = 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 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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.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 <[email protected]>"); |
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MODULE_DESCRIPTION("UniPhier eFuse driver"); |
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MODULE_LICENSE("GPL v2");
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