1ec564b47SSimon Glass#!/usr/bin/python 2ec564b47SSimon Glass# 3ec564b47SSimon Glass# Copyright (C) 2016 Google, Inc 4ec564b47SSimon Glass# Written by Simon Glass <sjg@chromium.org> 5ec564b47SSimon Glass# 6ec564b47SSimon Glass# SPDX-License-Identifier: GPL-2.0+ 7ec564b47SSimon Glass# 8ec564b47SSimon Glass 9*355c67c3SSimon Glassimport os 10ec564b47SSimon Glassimport struct 11*355c67c3SSimon Glassimport tempfile 12*355c67c3SSimon Glass 13*355c67c3SSimon Glassimport command 14*355c67c3SSimon Glassimport tools 15ec564b47SSimon Glass 16ec564b47SSimon Glassdef fdt32_to_cpu(val): 17ec564b47SSimon Glass """Convert a device tree cell to an integer 18ec564b47SSimon Glass 19ec564b47SSimon Glass Args: 20ec564b47SSimon Glass Value to convert (4-character string representing the cell value) 21ec564b47SSimon Glass 22ec564b47SSimon Glass Return: 23ec564b47SSimon Glass A native-endian integer value 24ec564b47SSimon Glass """ 25ec564b47SSimon Glass return struct.unpack(">I", val)[0] 26*355c67c3SSimon Glass 27*355c67c3SSimon Glassdef EnsureCompiled(fname): 28*355c67c3SSimon Glass """Compile an fdt .dts source file into a .dtb binary blob if needed. 29*355c67c3SSimon Glass 30*355c67c3SSimon Glass Args: 31*355c67c3SSimon Glass fname: Filename (if .dts it will be compiled). It not it will be 32*355c67c3SSimon Glass left alone 33*355c67c3SSimon Glass 34*355c67c3SSimon Glass Returns: 35*355c67c3SSimon Glass Filename of resulting .dtb file 36*355c67c3SSimon Glass """ 37*355c67c3SSimon Glass _, ext = os.path.splitext(fname) 38*355c67c3SSimon Glass if ext != '.dts': 39*355c67c3SSimon Glass return fname 40*355c67c3SSimon Glass 41*355c67c3SSimon Glass dts_input = tools.GetOutputFilename('source.dts') 42*355c67c3SSimon Glass dtb_output = tools.GetOutputFilename('source.dtb') 43*355c67c3SSimon Glass 44*355c67c3SSimon Glass search_paths = [os.path.join(os.getcwd(), 'include')] 45*355c67c3SSimon Glass root, _ = os.path.splitext(fname) 46*355c67c3SSimon Glass args = ['-E', '-P', '-x', 'assembler-with-cpp', '-D__ASSEMBLY__'] 47*355c67c3SSimon Glass args += ['-Ulinux'] 48*355c67c3SSimon Glass for path in search_paths: 49*355c67c3SSimon Glass args.extend(['-I', path]) 50*355c67c3SSimon Glass args += ['-o', dts_input, fname] 51*355c67c3SSimon Glass command.Run('cc', *args) 52*355c67c3SSimon Glass 53*355c67c3SSimon Glass # If we don't have a directory, put it in the tools tempdir 54*355c67c3SSimon Glass search_list = [] 55*355c67c3SSimon Glass for path in search_paths: 56*355c67c3SSimon Glass search_list.extend(['-i', path]) 57*355c67c3SSimon Glass args = ['-I', 'dts', '-o', dtb_output, '-O', 'dtb'] 58*355c67c3SSimon Glass args.extend(search_list) 59*355c67c3SSimon Glass args.append(dts_input) 60*355c67c3SSimon Glass command.Run('dtc', *args) 61*355c67c3SSimon Glass return dtb_output 62