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0861110bb4
Add SFP (Security Fuse Processor) read support for NXP (Freescale) QorIQ series SOC's. This patch adds support for the T1023 SOC using the SFP offset from the existing T1023 device tree. In theory this should also work for T1024, T1014 and T1013 which uses the same SFP base offset. Signed-off-by: Richard Alpe <richard@bit42.se> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20230823132744.350618-13-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
// 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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