diff options
Diffstat (limited to 'drivers/firmware/smccc/smccc.c')
-rw-r--r-- | drivers/firmware/smccc/smccc.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/firmware/smccc/smccc.c b/drivers/firmware/smccc/smccc.c new file mode 100644 index 000000000..60ccf3e90 --- /dev/null +++ b/drivers/firmware/smccc/smccc.c @@ -0,0 +1,61 @@ +// 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; + +void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit) +{ + 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; +} + +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); + +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); |