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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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"""VTA specific bitstream program library."""
import os
import argparse

def main():
    """Main function"""
    parser = argparse.ArgumentParser()
    parser.add_argument("target", type=str, default="",
                        help="target")
    parser.add_argument("bitstream", type=str, default="",
                        help="bitstream path")
    args = parser.parse_args()

    if args.target not in ('pynq', 'ultra96', 'de10nano', 'sim', 'tsim'):
        raise RuntimeError("Unknown target {}".format(args.target))

    curr_path = os.path.dirname(
        os.path.abspath(os.path.expanduser(__file__)))
    path_list = [
        os.path.join(curr_path, "/{}".format(args.bitstream)),
        os.path.join('./', "{}".format(args.bitstream))
    ]
    ok_path_list = [p for p in path_list if os.path.exists(p)]
    if not ok_path_list:
        raise RuntimeError("Cannot find bitstream file in %s" % str(path_list))

    bitstream_program(args.target, args.bitstream)

def pynq_bitstream_program(bitstream_path):
    # pylint: disable=import-outside-toplevel
    from pynq import Bitstream
    bitstream = Bitstream(bitstream_path)
    bitstream.download()

def de10nano_bitstream_program(bitstream_path):
    # pylint: disable=import-outside-toplevel
    from tvm import get_global_func
    program = get_global_func("vta.de10nano.program")
    program(bitstream_path)

def bitstream_program(target, bitstream):
    if target in ['pynq', 'ultra96']:
        pynq_bitstream_program(bitstream)
    elif target in ['de10nano']:
        de10nano_bitstream_program(bitstream)
    elif target in ['sim', 'tsim']:
        # In simulation, bit stream programming is a no-op
        return
    else:
        raise RuntimeError("Unknown target {}".format(target))

if __name__ == "__main__":
    main()
