MLECO-2948: Minor refactoring for platform modules.

Reducing dependency on cmsis-device sources as these will
be removed under MLECO-2944. Also, starting to refactor
to allow HAL to drop NPU and TA init routines - this will
happen in future CRs.

Added platform driver for native, and subsequent patches
will attempt to get rid of the HAL "profile" specific
sources and allow platform stub implementations at a level
below HAL. This will allow platforms drivers to only
override the range of functions that they actually want to
implement and will fall back on stubs for the rest. In this
CR only "utils" have been removed.

Change-Id: I09b4a28e20847a07a956c818c6f47c74aab89063

3 files changed, 130 insertions, 0 deletions

diff --git a/source/hal/platform/native/CMakeLists.txt b/source/hal/platform/native/CMakeLists.txt
new file mode 100644
index 0000000..0435cf1
--- /dev/null
+++ b/source/hal/platform/native/CMakeLists.txt
@@ -0,0 +1,56 @@
+#----------------------------------------------------------------------------
+#  Copyright (c) 2022 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
+#
+#      http://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.
+#----------------------------------------------------------------------------
+
+#########################################################
+#    Native target platform support library             #
+#########################################################
+
+cmake_minimum_required(VERSION 3.15.6)
+
+set(PLATFORM_DRIVERS_TARGET platform-drivers)
+
+project(${PLATFORM_DRIVERS_TARGET}
+    DESCRIPTION     "Platform drivers library for native target"
+    LANGUAGES       C CXX)
+
+# We should not be cross-compiling
+if (${CMAKE_CROSSCOMPILING})
+    message(FATAL_ERROR "Native drivers not available when cross-compiling.")
+endif()
+
+
+# Create static library
+add_library(${PLATFORM_DRIVERS_TARGET} STATIC)
+
+## Include directories - public
+target_include_directories(${PLATFORM_DRIVERS_TARGET}
+    PUBLIC
+    include)
+
+## Platform sources
+target_sources(${PLATFORM_DRIVERS_TARGET}
+    PRIVATE
+    source/platform_drivers.c)
+
+# Add dependencies:
+target_link_libraries(${PLATFORM_DRIVERS_TARGET} PUBLIC log)
+
+# Display status:
+message(STATUS "*******************************************************")
+message(STATUS "Library                                : " ${PLATFORM_DRIVERS_TARGET})
+message(STATUS "CMAKE_SYSTEM_PROCESSOR                 : " ${CMAKE_SYSTEM_PROCESSOR})
+message(STATUS "*******************************************************")
diff --git a/source/hal/platform/native/include/platform_drivers.h b/source/hal/platform/native/include/platform_drivers.h
new file mode 100644
index 0000000..ca6b6e0
--- /dev/null
+++ b/source/hal/platform/native/include/platform_drivers.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2022 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
+ *
+ *     http://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.
+ */
+
+#ifndef PLATFORM_DRIVERS_H
+#define PLATFORM_DRIVERS_H
+
+#include "log_macros.h"     /* Logging related helpers. */
+
+/**
+ * @brief   Initialises the platform components.
+ * @return  0 if successful, error code otherwise.
+ */
+int platform_init(void);
+
+/**
+ * @brief   Teardown for platform components.
+ */
+void platform_release(void);
+
+/**
+ * @brief   Sets the platform name.
+ * @param[out] name     Name of the platform to be set
+ * @param[in]  size     Size of the input buffer
+ */
+void platform_name(char* name, size_t size);
+
+#endif /* PLATFORM_DRIVERS_H */
diff --git a/source/hal/platform/native/source/platform_drivers.c b/source/hal/platform/native/source/platform_drivers.c
new file mode 100644
index 0000000..10db99a
--- /dev/null
+++ b/source/hal/platform/native/source/platform_drivers.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2022 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
+ *
+ *     http://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.
+ */
+
+#include "platform_drivers.h"
+
+#include <string.h>
+
+int platform_init(void)
+{
+    return 0;
+}
+
+void platform_release(void)
+{}
+
+void platform_name(char* name, size_t size)
+{
+    strncpy(name, "native", size);
+}
\ No newline at end of file