tests: psci: Introduce PSCI test

Add a simple test to the the PSCI driver

Signed-off-by: Carlo Caione <ccaione@baylibre.com>

tests/arch/arm/arm_psci/CMakeLists.txt

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(arm_psci)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})
+target_include_directories(app PRIVATE
+  ${ARCH_DIR}/${ARCH}/include
+)

tests/arch/arm/arm_psci/prj.conf

@@ -0,0 +1,2 @@
+CONFIG_TEST_USERSPACE=y
+CONFIG_ZTEST=y

tests/arch/arm/arm_psci/src/main.c

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2020 Carlo Caione <ccaione@baylibre.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <ztest.h>
+#include <drivers/psci.h>
+
+#define PSCI_DEV_NAME "PSCI"
+
+void test_psci_func(void)
+{
+	const struct device *psci;
+	uint32_t ver;
+	int ret;
+
+	psci = device_get_binding(PSCI_DEV_NAME);
+	zassert_not_null(psci, "Could not get psci device");
+
+	/* This should return 2 for v0.2 */
+	ver = psci_get_version(psci);
+	zassert_false((PSCI_VERSION_MAJOR(ver) == 0 &&
+		       PSCI_VERSION_MINOR(ver) < 2),
+		       "Wrong PSCI firware version");
+
+	/* This should return 0: (one core in the affinity instance is ON) */
+	ret = psci_affinity_info(psci, 0, 0);
+	zassert_true(ret == 0, "Wrong return code from psci_affinity_info");
+
+	/* This should return -PSCI_RET_ALREADY_ON that is mapped to -EINVAL */
+	ret = psci_cpu_on(psci, 0, 0);
+	zassert_true(ret == -EINVAL, "Wrong return code from psci_cpu_on");
+}
+
+void test_main(void)
+{
+	const struct device *psci = device_get_binding(PSCI_DEV_NAME);
+	zassert_not_null(psci, "Could not get psci device");
+
+	k_object_access_grant(psci, k_current_get());
+
+	ztest_test_suite(psci_func,
+		ztest_user_unit_test(test_psci_func));
+	ztest_run_test_suite(psci_func);
+}

tests/arch/arm/arm_psci/testcase.yaml

@@ -0,0 +1,5 @@
+tests:
+  arch.arm64.psci:
+    arch_allow: arm
+    tags: arm psci drivers userspace
+    filter: CONFIG_ARM_PSCI