Driver unit tests

Add driver unit tests that runs simple command streams directly
on top of the NPU driver.

Change-Id: I3fcce2a2bfbd458d14186b8fd13ba47174f49562
diff --git a/applications/driver_unit_tests/irq.cpp b/applications/driver_unit_tests/irq.cpp
new file mode 100644
index 0000000..e4b030a
--- /dev/null
+++ b/applications/driver_unit_tests/irq.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2021 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/****************************************************************************
+ * Includes
+ ****************************************************************************/
+
+#include "command_stream.hpp"
+
+#include <stdio.h>
+
+using namespace std;
+using namespace EthosU::CommandStream;
+
+/****************************************************************************
+ * Data
+ ****************************************************************************/
+
+__attribute__((section(".sram.data"), aligned(16))) char commandStream[] = {
+    DRIVER_ACTION_MAGIC()
+    DRIVER_ACTION_NOP()
+    DRIVER_ACTION_NOP()
+    DRIVER_ACTION_COMMAND_STREAM(1)
+
+    NPU_OP_STOP(0)
+};
+
+/****************************************************************************
+ * Functions
+ ****************************************************************************/
+
+int main() {
+    CommandStream cs(
+        DataPointer(commandStream, sizeof(commandStream)),
+        BasePointers(),
+        PmuEvents({
+            ETHOSU_PMU_CYCLE,
+            ETHOSU_PMU_NPU_IDLE,
+            ETHOSU_PMU_NPU_ACTIVE
+        })
+    );
+
+    const size_t repeat = 1000;
+
+    // Clear PMU
+    cs.getPmu().clear();
+
+    // Run inference
+    int ret = cs.run(repeat);
+    uint64_t cycleCount = cs.getPmu().getCycleCount();
+
+    // Print PMU counters
+    cs.getPmu().print();
+    printf("cycleCount=%llu, cycleCountPerJob=%llu\n", cycleCount, cycleCount / repeat);
+
+    return ret;
+}