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| author | Sudeep Holla <sudeep.holla@arm.com> | 2020-05-18 10:12:21 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-05-20 19:10:37 +0100 |
| commit | a4fb17465182c9fc13104e4df04d050892055205 (patch) | |
| tree | e0ace75bc1e3d551cc1a94e4ed9308896c639f9e /include/linux/arm-smccc.h | |
| parent | f2ae97062a48b114bcf8fb2e99574d9ed2c2cd1b (diff) | |
| download | lwn-a4fb17465182c9fc13104e4df04d050892055205.tar.gz lwn-a4fb17465182c9fc13104e4df04d050892055205.zip | |
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>
Diffstat (limited to 'include/linux/arm-smccc.h')
| -rw-r--r-- | include/linux/arm-smccc.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h index c3784ba8e2a4..c491d210e3c3 100644 --- a/include/linux/arm-smccc.h +++ b/include/linux/arm-smccc.h @@ -101,6 +101,17 @@ 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 */ |