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 s32 __ro_after_init smccc_soc_id_version = SMCCC_RET_NOT_SUPPORTED; 21 s32 __ro_after_init smccc_soc_id_revision = SMCCC_RET_NOT_SUPPORTED; 22 23 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit) 24 { 25 struct arm_smccc_res res; 26 27 smccc_version = version; 28 smccc_conduit = conduit; 29 30 smccc_trng_available = smccc_probe_trng(); 31 if (IS_ENABLED(CONFIG_ARM64_SVE) && 32 smccc_version >= ARM_SMCCC_VERSION_1_3) 33 smccc_has_sve_hint = true; 34 35 if ((smccc_version >= ARM_SMCCC_VERSION_1_2) && 36 (smccc_conduit != SMCCC_CONDUIT_NONE)) { 37 arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, 38 ARM_SMCCC_ARCH_SOC_ID, &res); 39 if ((s32)res.a0 >= 0) { 40 arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 0, &res); 41 smccc_soc_id_version = (s32)res.a0; 42 arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 1, &res); 43 smccc_soc_id_revision = (s32)res.a0; 44 } 45 } 46 } 47 48 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void) 49 { 50 if (smccc_version < ARM_SMCCC_VERSION_1_1) 51 return SMCCC_CONDUIT_NONE; 52 53 return smccc_conduit; 54 } 55 EXPORT_SYMBOL_GPL(arm_smccc_1_1_get_conduit); 56 57 u32 arm_smccc_get_version(void) 58 { 59 return smccc_version; 60 } 61 EXPORT_SYMBOL_GPL(arm_smccc_get_version); 62 63 s32 arm_smccc_get_soc_id_version(void) 64 { 65 return smccc_soc_id_version; 66 } 67 68 s32 arm_smccc_get_soc_id_revision(void) 69 { 70 return smccc_soc_id_revision; 71 } 72 73 static int __init smccc_devices_init(void) 74 { 75 struct platform_device *pdev; 76 77 if (smccc_trng_available) { 78 pdev = platform_device_register_simple("smccc_trng", -1, 79 NULL, 0); 80 if (IS_ERR(pdev)) 81 pr_err("smccc_trng: could not register device: %ld\n", 82 PTR_ERR(pdev)); 83 } 84 85 return 0; 86 } 87 device_initcall(smccc_devices_init); 88