PSCI v1.0 introduces a PSCI_FEATURES call that allows to probe for
features related to a specific function identifier.
This patch adds PSCI_FEATURES support to the PSCI firmware layer.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
---
drivers/firmware/psci.c | 6 ++++++
include/uapi/linux/psci.h | 2 ++
2 files changed, 8 insertions(+)
diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index f1579a4..2330099 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -196,6 +196,12 @@ static void psci_sys_poweroff(void)
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
}
+static int __init psci_features(u32 psci_func_id)
+{
+ return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
+ psci_func_id, 0, 0);
+}
+
/*
* Detect the presence of a resident Trusted OS which may cause CPU_OFF to
* return DENIED (which would be fatal).
diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h
index 64469e6..187b828d 100644
--- a/include/uapi/linux/psci.h
+++ b/include/uapi/linux/psci.h
@@ -46,6 +46,8 @@
#define PSCI_0_2_FN64_MIGRATE PSCI_0_2_FN64(5)
#define PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU PSCI_0_2_FN64(7)
+#define PSCI_1_0_FN_PSCI_FEATURES PSCI_0_2_FN(10)
+
/* PSCI v0.2 power state encoding for CPU_SUSPEND function */
#define PSCI_0_2_POWER_STATE_ID_MASK 0xffff
#define PSCI_0_2_POWER_STATE_ID_SHIFT 0
--
2.2.1
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
