1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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 attributes 14 * 15 * @base: starting physical address for secure qfprom corrected address space. 16 * @dev: qfprom device structure. 17 */ 18 struct sec_qfprom { 19 phys_addr_t base; 20 struct device *dev; 21 }; 22 23 static 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 46 static int sec_qfprom_probe(struct platform_device *pdev) 47 { 48 struct nvmem_config econfig = { 49 .name = "sec-qfprom", 50 .stride = 1, 51 .word_size = 1, 52 .id = NVMEM_DEVID_AUTO, 53 .reg_read = sec_qfprom_reg_read, 54 }; 55 struct device *dev = &pdev->dev; 56 struct nvmem_device *nvmem; 57 struct sec_qfprom *priv; 58 struct resource *res; 59 60 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 61 if (!priv) 62 return -ENOMEM; 63 64 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 65 if (!res) 66 return -EINVAL; 67 68 priv->base = res->start; 69 70 econfig.size = resource_size(res); 71 econfig.dev = dev; 72 econfig.priv = priv; 73 74 priv->dev = dev; 75 76 nvmem = devm_nvmem_register(dev, &econfig); 77 78 return PTR_ERR_OR_ZERO(nvmem); 79 } 80 81 static const struct of_device_id sec_qfprom_of_match[] = { 82 { .compatible = "qcom,sec-qfprom" }, 83 {/* sentinel */}, 84 }; 85 MODULE_DEVICE_TABLE(of, sec_qfprom_of_match); 86 87 static struct platform_driver qfprom_driver = { 88 .probe = sec_qfprom_probe, 89 .driver = { 90 .name = "qcom_sec_qfprom", 91 .of_match_table = sec_qfprom_of_match, 92 }, 93 }; 94 module_platform_driver(qfprom_driver); 95 MODULE_DESCRIPTION("Qualcomm Secure QFPROM driver"); 96 MODULE_LICENSE("GPL"); 97