drivers: tee: optee: Introducing OP-TEE driver implementation

This includes the TEE driver api implementation for OP-TEE.
It provides an interface to the OP-TEE TrustZone from the Normal space
to start sessions and request functions of the TA.

- targets ARM and ARM64;
- use SMC to connect to OP-TEE;
- accepts requests on privileged and unprivileged device.

Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@epam.com>

drivers/tee/CMakeLists.txt

@@ -1,5 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
+add_subdirectory_ifdef(CONFIG_OPTEE optee)
+
 if (CONFIG_TEE)
 zephyr_library()
 zephyr_library_sources(tee.c)

drivers/tee/Kconfig

@@ -13,4 +13,6 @@ module-str = tee
 
 comment "Device Drivers"
 
+source "drivers/tee/optee/Kconfig"
+
 endif # TEE

drivers/tee/optee/CMakeLists.txt

@@ -0,0 +1,6 @@
+# Copyright (c) 2023 EPAM Systems
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+
+zephyr_library_sources(optee.c)

drivers/tee/optee/Kconfig

@@ -0,0 +1,21 @@
+# Copyright (c) 2023 EPAM Systems
+# SPDX-License-Identifier: Apache-2.0
+
+config OPTEE
+	bool "OP-TEE driver"
+	depends on (ARM64 && ARMV8_A_NS && HAS_ARM_SMCCC) || ZTEST
+	help
+	  This implements support of the OP-TEE firmware which is loaded
+	  as BL32 image. OP-TEE is a Trust Zone OS which implements mechanisms
+	  of the hardware isolation and rely to ARM TrustZone technology.
+	  Driver requests functions from the OP-TEE and implements RPC mechanism
+	  needed by OP-TEE to run services. See https://www.op-tee.org for more
+	  information.
+
+config OPTEE_MAX_NOTIF
+	int "Max number of OP-TEE notifications"
+	depends on OPTEE
+	default 255
+	help
+	 Sets the maximum notifications from OP-TEE to the Normal World. OP-TEE using
+	 this mechanism for the synchronization.