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79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2023 Westermo Network Technologies AB
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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 qoriq_efuse_priv {
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void __iomem *base;
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};
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static int qoriq_efuse_read(void *context, unsigned int offset, void *val,
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size_t bytes)
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{
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struct qoriq_efuse_priv *priv = context;
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/* .stride = 4 so offset is guaranteed to be aligned */
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__ioread32_copy(val, priv->base + offset, bytes / 4);
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/* Ignore trailing bytes (there shouldn't be any) */
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return 0;
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}
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static int qoriq_efuse_probe(struct platform_device *pdev)
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{
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struct nvmem_config config = {
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.dev = &pdev->dev,
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.read_only = true,
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.reg_read = qoriq_efuse_read,
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.stride = sizeof(u32),
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.word_size = sizeof(u32),
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.name = "qoriq_efuse_read",
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.id = NVMEM_DEVID_AUTO,
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.root_only = true,
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};
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struct qoriq_efuse_priv *priv;
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struct nvmem_device *nvmem;
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struct resource *res;
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priv = devm_kzalloc(config.dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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config.size = resource_size(res);
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config.priv = priv;
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nvmem = devm_nvmem_register(config.dev, &config);
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return PTR_ERR_OR_ZERO(nvmem);
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}
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static const struct of_device_id qoriq_efuse_of_match[] = {
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{ .compatible = "fsl,t1023-sfp", },
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, qoriq_efuse_of_match);
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static struct platform_driver qoriq_efuse_driver = {
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.probe = qoriq_efuse_probe,
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.driver = {
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.name = "qoriq-efuse",
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.of_match_table = qoriq_efuse_of_match,
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},
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};
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module_platform_driver(qoriq_efuse_driver);
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MODULE_AUTHOR("Richard Alpe <richard.alpe@bit42.se>");
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MODULE_DESCRIPTION("NXP QorIQ Security Fuse Processor (SFP) Reader");
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MODULE_LICENSE("GPL");
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