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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved.4 */5 6#include <linux/firmware/qcom/qcom_scm.h>7#include <linux/mod_devicetable.h>8#include <linux/nvmem-provider.h>9#include <linux/platform_device.h>10#include <linux/pm_runtime.h>11 12/**13 * struct sec_qfprom - structure holding secure qfprom attributes14 *15 * @base: starting physical address for secure qfprom corrected address space.16 * @dev: qfprom device structure.17 */18struct sec_qfprom {19 phys_addr_t base;20 struct device *dev;21};22 23static int sec_qfprom_reg_read(void *context, unsigned int reg, void *_val, size_t bytes)24{25 struct sec_qfprom *priv = context;26 unsigned int i;27 u8 *val = _val;28 u32 read_val;29 u8 *tmp;30 31 for (i = 0; i < bytes; i++, reg++) {32 if (i == 0 || reg % 4 == 0) {33 if (qcom_scm_io_readl(priv->base + (reg & ~3), &read_val)) {34 dev_err(priv->dev, "Couldn't access fuse register\n");35 return -EINVAL;36 }37 tmp = (u8 *)&read_val;38 }39 40 val[i] = tmp[reg & 3];41 }42 43 return 0;44}45 46static int sec_qfprom_probe(struct platform_device *pdev)47{48 struct nvmem_config econfig = {49 .name = "sec-qfprom",50 .add_legacy_fixed_of_cells = true,51 .stride = 1,52 .word_size = 1,53 .id = NVMEM_DEVID_AUTO,54 .reg_read = sec_qfprom_reg_read,55 };56 struct device *dev = &pdev->dev;57 struct nvmem_device *nvmem;58 struct sec_qfprom *priv;59 struct resource *res;60 61 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);62 if (!priv)63 return -ENOMEM;64 65 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);66 if (!res)67 return -EINVAL;68 69 priv->base = res->start;70 71 econfig.size = resource_size(res);72 econfig.dev = dev;73 econfig.priv = priv;74 75 priv->dev = dev;76 77 nvmem = devm_nvmem_register(dev, &econfig);78 79 return PTR_ERR_OR_ZERO(nvmem);80}81 82static const struct of_device_id sec_qfprom_of_match[] = {83 { .compatible = "qcom,sec-qfprom" },84 {/* sentinel */},85};86MODULE_DEVICE_TABLE(of, sec_qfprom_of_match);87 88static struct platform_driver qfprom_driver = {89 .probe = sec_qfprom_probe,90 .driver = {91 .name = "qcom_sec_qfprom",92 .of_match_table = sec_qfprom_of_match,93 },94};95module_platform_driver(qfprom_driver);96MODULE_DESCRIPTION("Qualcomm Secure QFPROM driver");97MODULE_LICENSE("GPL");98