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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020 Arm Limited
*/
#define pr_fmt(fmt) "smccc: " fmt
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/arm-smccc.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <asm/archrandom.h>
static u32 smccc_version = ARM_SMCCC_VERSION_1_0;
static enum arm_smccc_conduit smccc_conduit = SMCCC_CONDUIT_NONE;
bool __ro_after_init smccc_trng_available = false;
u64 __ro_after_init smccc_has_sve_hint = false;
s32 __ro_after_init smccc_soc_id_version = SMCCC_RET_NOT_SUPPORTED;
s32 __ro_after_init smccc_soc_id_revision = SMCCC_RET_NOT_SUPPORTED;
void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit)
{
struct arm_smccc_res res;
smccc_version = version;
smccc_conduit = conduit;
smccc_trng_available = smccc_probe_trng();
if (IS_ENABLED(CONFIG_ARM64_SVE) &&
smccc_version >= ARM_SMCCC_VERSION_1_3)
smccc_has_sve_hint = true;
if ((smccc_version >= ARM_SMCCC_VERSION_1_2) &&
(smccc_conduit != SMCCC_CONDUIT_NONE)) {
arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_SOC_ID, &res);
if ((s32)res.a0 >= 0) {
arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 0, &res);
smccc_soc_id_version = (s32)res.a0;
arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 1, &res);
smccc_soc_id_revision = (s32)res.a0;
}
}
}
enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
{
if (smccc_version < ARM_SMCCC_VERSION_1_1)
return SMCCC_CONDUIT_NONE;
return smccc_conduit;
}
EXPORT_SYMBOL_GPL(arm_smccc_1_1_get_conduit);
u32 arm_smccc_get_version(void)
{
return smccc_version;
}
EXPORT_SYMBOL_GPL(arm_smccc_get_version);
s32 arm_smccc_get_soc_id_version(void)
{
return smccc_soc_id_version;
}
s32 arm_smccc_get_soc_id_revision(void)
{
return smccc_soc_id_revision;
}
static int __init smccc_devices_init(void)
{
struct platform_device *pdev;
if (smccc_trng_available) {
pdev = platform_device_register_simple("smccc_trng", -1,
NULL, 0);
if (IS_ERR(pdev))
pr_err("smccc_trng: could not register device: %ld\n",
PTR_ERR(pdev));
}
return 0;
}
device_initcall(smccc_devices_init);
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