1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2020 Arm Limited 4 */ 5 6 #define pr_fmt(fmt) "smccc: " fmt 7 8 #include <linux/cache.h> 9 #include <linux/init.h> 10 #include <linux/arm-smccc.h> 11 #include <linux/kernel.h> 12 #include <linux/platform_device.h> 13 #include <asm/archrandom.h> 14 15 static u32 smccc_version = ARM_SMCCC_VERSION_1_0; 16 static enum arm_smccc_conduit smccc_conduit = SMCCC_CONDUIT_NONE; 17 18 bool __ro_after_init smccc_trng_available = false; 19 u64 __ro_after_init smccc_has_sve_hint = false; 20 21 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit) 22 { 23 smccc_version = version; 24 smccc_conduit = conduit; 25 26 smccc_trng_available = smccc_probe_trng(); 27 if (IS_ENABLED(CONFIG_ARM64_SVE) && 28 smccc_version >= ARM_SMCCC_VERSION_1_3) 29 smccc_has_sve_hint = true; 30 } 31 32 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void) 33 { 34 if (smccc_version < ARM_SMCCC_VERSION_1_1) 35 return SMCCC_CONDUIT_NONE; 36 37 return smccc_conduit; 38 } 39 EXPORT_SYMBOL_GPL(arm_smccc_1_1_get_conduit); 40 41 u32 arm_smccc_get_version(void) 42 { 43 return smccc_version; 44 } 45 EXPORT_SYMBOL_GPL(arm_smccc_get_version); 46 47 static int __init smccc_devices_init(void) 48 { 49 struct platform_device *pdev; 50 51 if (smccc_trng_available) { 52 pdev = platform_device_register_simple("smccc_trng", -1, 53 NULL, 0); 54 if (IS_ERR(pdev)) 55 pr_err("smccc_trng: could not register device: %ld\n", 56 PTR_ERR(pdev)); 57 } 58 59 return 0; 60 } 61 device_initcall(smccc_devices_init); 62