Commit a4fb1746 authored May 18, 2020 by Sudeep Holla Committed by Will Deacon May 20, 2020

firmware: smccc: Add function to fetch SMCCC version



For backward compatibility reasons, PSCI maintains SMCCC version as
SMCCC didn't provide ARM_SMCCC_VERSION_FUNC_ID until v1.1.

PSCI initialises both the SMCCC version and conduit. Similar to the
conduit, let us provide accessors to fetch the SMCCC version also so
that other SMCCC v1.1+ features can use it.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Etienne Carriere <etienne.carriere@st.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Etienne Carriere <etienne.carriere@st.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20200518091222.27467-7-sudeep.holla@arm.com


Signed-off-by: Will Deacon <will@kernel.org>

parent f2ae9706

drivers/firmware/smccc/smccc.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -24,3 +24,8 @@ enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)

		return smccc_conduit;
		}

		u32 arm_smccc_get_version(void)
		{
		return smccc_version;
		}

include/linux/arm-smccc.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -100,6 +100,17 @@ enum arm_smccc_conduit {
		*/
		enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);

		/**
		* arm_smccc_get_version()
		*
		* Returns the version to be used for SMCCCv1.1 or later.
		*
		* When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this
		* does not imply the presence of firmware or a valid conduit. Caller
		* handling SMCCCv1.0 must determine the conduit by other means.
		*/
		u32 arm_smccc_get_version(void);

		/**
		* struct arm_smccc_res - Result from SMC/HVC call
		* @a0-a3 result values from registers 0 to 3