1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2020 Arm Limited
6 #define pr_fmt(fmt) "smccc: " fmt
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>
15 static u32 smccc_version = ARM_SMCCC_VERSION_1_0;
16 static enum arm_smccc_conduit smccc_conduit = SMCCC_CONDUIT_NONE;
18 bool __ro_after_init smccc_trng_available = false;
19 u64 __ro_after_init smccc_has_sve_hint = false;
21 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit)
23 smccc_version = version;
24 smccc_conduit = conduit;
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;
32 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
34 if (smccc_version < ARM_SMCCC_VERSION_1_1)
35 return SMCCC_CONDUIT_NONE;
39 EXPORT_SYMBOL_GPL(arm_smccc_1_1_get_conduit);
41 u32 arm_smccc_get_version(void)
45 EXPORT_SYMBOL_GPL(arm_smccc_get_version);
47 static int __init smccc_devices_init(void)
49 struct platform_device *pdev;
51 if (smccc_trng_available) {
52 pdev = platform_device_register_simple("smccc_trng", -1,
55 pr_err("smccc_trng: could not register device: %ld\n",
61 device_initcall(smccc_devices_init);