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firmware: smccc: Add function to fetch SMCCC version

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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>
This commit is contained in:
Sudeep Holla 2020-05-18 10:12:21 +01:00 committed by Will Deacon
parent f2ae97062a
commit a4fb174651
2 changed files with 16 additions and 0 deletions
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5
drivers/firmware/smccc/smccc.c
View File

@ -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;
}

11
include/linux/arm-smccc.h
View File

@ -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