79 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2023 Westermo Network Technologies AB4 */5 6#include <linux/device.h>7#include <linux/io.h>8#include <linux/module.h>9#include <linux/mod_devicetable.h>10#include <linux/nvmem-provider.h>11#include <linux/platform_device.h>12 13struct qoriq_efuse_priv {14 void __iomem *base;15};16 17static int qoriq_efuse_read(void *context, unsigned int offset, void *val,18 size_t bytes)19{20 struct qoriq_efuse_priv *priv = context;21 22 /* .stride = 4 so offset is guaranteed to be aligned */23 __ioread32_copy(val, priv->base + offset, bytes / 4);24 25 /* Ignore trailing bytes (there shouldn't be any) */26 27 return 0;28}29 30static int qoriq_efuse_probe(struct platform_device *pdev)31{32 struct nvmem_config config = {33 .dev = &pdev->dev,34 .read_only = true,35 .reg_read = qoriq_efuse_read,36 .stride = sizeof(u32),37 .word_size = sizeof(u32),38 .name = "qoriq_efuse_read",39 .id = NVMEM_DEVID_AUTO,40 .root_only = true,41 };42 struct qoriq_efuse_priv *priv;43 struct nvmem_device *nvmem;44 struct resource *res;45 46 priv = devm_kzalloc(config.dev, sizeof(*priv), GFP_KERNEL);47 if (!priv)48 return -ENOMEM;49 50 priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);51 if (IS_ERR(priv->base))52 return PTR_ERR(priv->base);53 54 config.size = resource_size(res);55 config.priv = priv;56 nvmem = devm_nvmem_register(config.dev, &config);57 58 return PTR_ERR_OR_ZERO(nvmem);59}60 61static const struct of_device_id qoriq_efuse_of_match[] = {62 { .compatible = "fsl,t1023-sfp", },63 {/* sentinel */},64};65MODULE_DEVICE_TABLE(of, qoriq_efuse_of_match);66 67static struct platform_driver qoriq_efuse_driver = {68 .probe = qoriq_efuse_probe,69 .driver = {70 .name = "qoriq-efuse",71 .of_match_table = qoriq_efuse_of_match,72 },73};74module_platform_driver(qoriq_efuse_driver);75 76MODULE_AUTHOR("Richard Alpe <richard.alpe@bit42.se>");77MODULE_DESCRIPTION("NXP QorIQ Security Fuse Processor (SFP) Reader");78MODULE_LICENSE("GPL");79