From a37e31fc97efe7f7c68cb381cf4390e472c09061 Mon Sep 17 00:00:00 2001 From: Andre Przywara Date: Wed, 6 Jan 2021 10:34:50 +0000 Subject: firmware: smccc: Introduce SMCCC TRNG framework The ARM DEN0098 document describe an SMCCC based firmware service to deliver hardware generated random numbers. Its existence is advertised according to the SMCCC v1.1 specification. Add a (dummy) call to probe functions implemented in each architecture (ARM and arm64), to determine the existence of this interface. For now this return false, but this will be overwritten by each architecture's support patch. Signed-off-by: Andre Przywara Reviewed-by: Linus Walleij Reviewed-by: Sudeep Holla Signed-off-by: Will Deacon --- drivers/firmware/smccc/smccc.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/firmware/smccc') diff --git a/drivers/firmware/smccc/smccc.c b/drivers/firmware/smccc/smccc.c index 00c88b809c0c..d52bfc5ed5e4 100644 --- a/drivers/firmware/smccc/smccc.c +++ b/drivers/firmware/smccc/smccc.c @@ -5,16 +5,22 @@ #define pr_fmt(fmt) "smccc: " fmt +#include #include #include +#include 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; + 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(); } enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void) -- cgit v1.2.3