From a4fb17465182c9fc13104e4df04d050892055205 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@arm.com>
Date: Mon, 18 May 2020 10:12:21 +0100
Subject: [PATCH] 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>
---
drivers/firmware/smccc/smccc.c | 5 +++++
include/linux/arm-smccc.h | 11 +++++++++++
2 files changed, 16 insertions(+)
diff --git a/drivers/firmware/smccc/smccc.c b/drivers/firmware/smccc/smccc.c
index de92a4b9f8f62..4e80921ee2124 100644
--- a/drivers/firmware/smccc/smccc.c
+++ b/drivers/firmware/smccc/smccc.c
@@ -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;
+}
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index c3784ba8e2a42..c491d210e3c35 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -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
--
2.30.2