xref: /openbmc/linux/drivers/firmware/smccc/smccc.c (revision 276e552e)
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 <asm/archrandom.h>
13 
14 static u32 smccc_version = ARM_SMCCC_VERSION_1_0;
15 static enum arm_smccc_conduit smccc_conduit = SMCCC_CONDUIT_NONE;
16 
17 bool __ro_after_init smccc_trng_available = false;
18 
19 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit)
20 {
21 	smccc_version = version;
22 	smccc_conduit = conduit;
23 
24 	smccc_trng_available = smccc_probe_trng();
25 }
26 
27 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
28 {
29 	if (smccc_version < ARM_SMCCC_VERSION_1_1)
30 		return SMCCC_CONDUIT_NONE;
31 
32 	return smccc_conduit;
33 }
34 EXPORT_SYMBOL_GPL(arm_smccc_1_1_get_conduit);
35 
36 u32 arm_smccc_get_version(void)
37 {
38 	return smccc_version;
39 }
40 EXPORT_SYMBOL_GPL(arm_smccc_get_version);
41