# Copyright 2022 The Pigweed Authors
#
# 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
#
#     https://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.

import("//build_overrides/pi_pico.gni")
import("//build_overrides/pigweed.gni")

import("$dir_pw_build/copy_and_patch.gni")
import("$dir_pw_build/target_types.gni")
import("$dir_pw_system/system_target.gni")
import("$dir_pw_toolchain/arm_gcc/toolchains.gni")
import("$dir_pw_toolchain/generate_toolchain.gni")

declare_args() {
  pw_targets_ENABLE_RP2040_TEST_RUNNER = false
}

if (current_toolchain != default_toolchain) {
  pw_source_set("pre_init") {
    remove_configs = [ "$dir_pw_build:strict_warnings" ]

    deps = [
      "$PICO_ROOT/src/common/pico_base",
      "$PICO_ROOT/src/common/pico_stdlib",
      "$PICO_ROOT/src/rp2_common/hardware_exception",
      "$PICO_ROOT/src/rp2_common/hardware_watchdog",
      "$PICO_ROOT/src/rp2_common/pico_malloc",
      "$dir_pigweed/targets/rp2040:memmap_default_ld",
      "$dir_pw_cpu_exception:entry",
      "$dir_pw_system",
      "$dir_pw_system:crash_handler",
      "$pw_external_freertos",
      "$pw_external_freertos:support",
    ]
    sources = [ "boot.cc" ]
  }

  pw_source_set("device_handler") {
    deps = [
      "$PICO_ROOT/src/rp2_common/hardware_watchdog",
      "$dir_pw_cpu_exception:entry",
      "$dir_pw_cpu_exception_cortex_m:snapshot",
      "$dir_pw_system:device_handler.facade",
      "$dir_pw_thread_freertos:snapshot",
    ]
    sources = [ "device_handler.cc" ]
  }

  config("config_includes") {
    include_dirs = [ "config" ]
    defines = [ "_PW_PICO_GN_BUILD=1" ]
  }

  config("module_config_include") {
    cflags = [
      "-include",
      rebase_path("config/pigweed_module_config.h", root_build_dir),
    ]
    visibility = [ ":*" ]
  }

  pw_source_set("module_config") {
    public_configs = [ ":module_config_include" ]
  }

  config("rp2040_hal_config") {
    inputs = [ "config/rp2040_hal_config.h" ]
    cflags = [ "-include" +
               rebase_path("config/rp2040_hal_config.h", root_build_dir) ]
  }

  pw_copy_and_patch_file("memmap_default_ld") {
    source =
        "${PICO_SRC_DIR}/src/rp2_common/pico_standard_link/memmap_default.ld"
    out = "patched_memmap_default.ld"
    patch_file = "patches/pico_sdk_v1_memmap_default.ld.patch"

    # Check if PICO_SRC_DIR is defined, as in build configurations which don't
    # define PICO_SRC_DIR, GN will complain, as root can't be an empty string.
    if (PICO_SRC_DIR != "") {
      root = "${PICO_SRC_DIR}"
    }
  }

  config("linker_script") {
    _linker_scripts = get_target_outputs(":memmap_default_ld")
    _linker_script_path = rebase_path(_linker_scripts[0], root_build_dir)
    ldflags = [ "-T${_linker_script_path}" ]
  }

  pw_source_set("rp2040_freertos_config") {
    public_configs = [ ":config_includes" ]
    public_deps = [ "$pw_external_freertos:config_assert" ]
    public = [ "config/FreeRTOSConfig.h" ]
  }

  pw_source_set("unit_test_app") {
    sources = [ "unit_test_app.cc" ]
    deps = [
      "$dir_pw_status",
      "$dir_pw_system",
      "$dir_pw_thread:thread",
      "$dir_pw_thread_freertos:thread",
      "$dir_pw_unit_test:rpc_service",
    ]
  }

  # We don't want this linked into the boot_stage2 binary, so make the printf
  # float config a source set added to pw_build_LINK_DEPS (which is dropped on
  # the boot_stage2 binary) rather than as a default_config.
  pw_source_set("float_printf_adapter") {
    all_dependent_configs = [ "$dir_pw_toolchain/arm_gcc:enable_float_printf" ]
  }
}

pw_system_target("rp2040") {
  cpu = PW_SYSTEM_CPU.CORTEX_M0PLUS
  scheduler = PW_SYSTEM_SCHEDULER.FREERTOS
  use_pw_malloc = false
  global_configs = [ ":rp2040_hal_config" ]

  build_args = {
    pw_build_DEFAULT_MODULE_CONFIG = get_path_info(":module_config", "abspath")
    pw_build_EXECUTABLE_TARGET_TYPE = "pico_executable"
    pw_build_EXECUTABLE_TARGET_TYPE_FILE =
        get_path_info("$dir_pigweed/targets/rp2040/pico_executable.gni",
                      "abspath")

    pw_assert_BACKEND = dir_pw_assert_trap
    pw_assert_LITE_BACKEND = dir_pw_assert_trap

    pw_cpu_exception_ENTRY_BACKEND =
        "$dir_pw_cpu_exception_cortex_m:cpu_exception_armv6m"
    pw_cpu_exception_HANDLER_BACKEND = "$dir_pw_cpu_exception:basic_handler"
    pw_cpu_exception_SUPPORT_BACKEND = "$dir_pw_cpu_exception_cortex_m:support"

    pw_log_BACKEND = dir_pw_log_tokenized
    pw_log_tokenized_HANDLER_BACKEND = "$dir_pw_system:log_backend.impl"

    pw_third_party_freertos_CONFIG =
        "$dir_pigweed/targets/rp2040:rp2040_freertos_config"
    pw_third_party_freertos_PORT = "$pw_external_freertos:arm_cm0"

    pw_sys_io_BACKEND = dir_pw_sys_io_stdio

    pw_sync_INTERRUPT_SPIN_LOCK_BACKEND =
        "$dir_pw_sync_freertos:interrupt_spin_lock"

    pw_system_DEVICE_HANDLER = "$dir_pigweed/targets/rp2040:device_handler"

    PICO_LINKER_SCRIPT = "$dir_pigweed/targets/rp2040:linker_script"

    pw_build_LINK_DEPS += [
      "$dir_pigweed/targets/rp2040:pre_init",
      "$dir_pw_assert:impl",
      "$dir_pw_atomic:atomic_cortex_m",
      "$dir_pw_cpu_exception:entry_impl",
      "$dir_pw_log:impl",
      get_path_info(":float_printf_adapter", "abspath"),
    ]

    # ONLY RELEVANT FOR UNIT TESTS.
    if (pw_targets_ENABLE_RP2040_TEST_RUNNER) {
      _test_runner_script =
          "$dir_pigweed/targets/rp2040/py/rp2040_utils/unit_test_client.py"
      pw_unit_test_AUTOMATIC_RUNNER =
          get_path_info(_test_runner_script, "abspath")
    }
    pw_unit_test_MAIN = "$dir_pigweed/targets/rp2040:unit_test_app"
  }
}

# This is target is to keep the presubmit happy.
# It is not yet used.
# TODO: pwbug.dev/349853258 - add a GN toolchain for pw_system_async.
pw_source_set("system_async_example") {
  sources = [ "system_async_example.cc" ]
}