// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved. */ #include <linux/firmware/qcom/qcom_scm.h> #include <linux/mod_devicetable.h> #include <linux/nvmem-provider.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> /** * struct sec_qfprom - structure holding secure qfprom attributes * * @base: starting physical address for secure qfprom corrected address space. * @dev: qfprom device structure. */ struct sec_qfprom { phys_addr_t base; struct device *dev; }; static int sec_qfprom_reg_read(void *context, unsigned int reg, void *_val, size_t bytes) { struct sec_qfprom *priv = context; unsigned int i; u8 *val = _val; u32 read_val; u8 *tmp; for (i = 0; i < bytes; i++, reg++) { if (i == 0 || reg % 4 == 0) { if (qcom_scm_io_readl(priv->base + (reg & ~3), &read_val)) { dev_err(priv->dev, "Couldn't access fuse register\n"); return -EINVAL; } tmp = (u8 *)&read_val; } val[i] = tmp[reg & 3]; } return 0; } static int sec_qfprom_probe(struct platform_device *pdev) { struct nvmem_config econfig = { .name = "sec-qfprom", .add_legacy_fixed_of_cells = true, .stride = 1, .word_size = 1, .id = NVMEM_DEVID_AUTO, .reg_read = sec_qfprom_reg_read, }; struct device *dev = &pdev->dev; struct nvmem_device *nvmem; struct sec_qfprom *priv; struct resource *res; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -EINVAL; priv->base = res->start; econfig.size = resource_size(res); econfig.dev = dev; econfig.priv = priv; priv->dev = dev; nvmem = devm_nvmem_register(dev, &econfig); return PTR_ERR_OR_ZERO(nvmem); } static const struct of_device_id sec_qfprom_of_match[] = { { .compatible = "qcom,sec-qfprom" }, {/* sentinel */}, }; MODULE_DEVICE_TABLE(of, sec_qfprom_of_match); static struct platform_driver qfprom_driver = { .probe = sec_qfprom_probe, .driver = { .name = "qcom_sec_qfprom", .of_match_table = sec_qfprom_of_match, }, }; module_platform_driver(qfprom_driver); MODULE_DESCRIPTION("Qualcomm Secure QFPROM driver"); MODULE_LICENSE("GPL");