projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| f2ae9706 SH |
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 | ||
| a37e31fc | 8 | #include <linux/cache.h> |
| f2ae9706 SH |
9 | #include <linux/init.h> |
| 10 | #include <linux/arm-smccc.h> | |
| 6e085e0a | 11 | #include <linux/kernel.h> |
| b83c2d92 | 12 | #include <linux/platform_device.h> |
| a37e31fc | 13 | #include <asm/archrandom.h> |
| f2ae9706 SH |
14 | |
| 15 | static u32 smccc_version = ARM_SMCCC_VERSION_1_0; | |
| 16 | static enum arm_smccc_conduit smccc_conduit = SMCCC_CONDUIT_NONE; | |
| 17 | ||
| a37e31fc | 18 | bool __ro_after_init smccc_trng_available = false; |
| cfa7ff95 | 19 | u64 __ro_after_init smccc_has_sve_hint = false; |
| a37e31fc | 20 | |
| f2ae9706 SH |
21 | void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit) |
| 22 | { | |
| 23 | smccc_version = version; | |
| 24 | smccc_conduit = conduit; | |
| a37e31fc AP |
25 | |
| 26 | smccc_trng_available = smccc_probe_trng(); | |
| cfa7ff95 MB |
27 | if (IS_ENABLED(CONFIG_ARM64_SVE) && |
| 28 | smccc_version >= ARM_SMCCC_VERSION_1_3) | |
| 29 | smccc_has_sve_hint = true; | |
| f2ae9706 SH |
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 | } | |
| 6825f17c | 39 | EXPORT_SYMBOL_GPL(arm_smccc_1_1_get_conduit); |
| a4fb1746 SH |
40 | |
| 41 | u32 arm_smccc_get_version(void) | |
| 42 | { | |
| 43 | return smccc_version; | |
| 44 | } | |
| 6825f17c | 45 | EXPORT_SYMBOL_GPL(arm_smccc_get_version); |
| b83c2d92 AP |
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); |