1#!/usr/bin/python 2# 3# Copyright (C) 2016 Google, Inc 4# Written by Simon Glass <sjg@chromium.org> 5# 6# SPDX-License-Identifier: GPL-2.0+ 7# 8 9import os 10import struct 11import sys 12import tempfile 13 14import command 15import tools 16 17def fdt32_to_cpu(val): 18 """Convert a device tree cell to an integer 19 20 Args: 21 Value to convert (4-character string representing the cell value) 22 23 Return: 24 A native-endian integer value 25 """ 26 if sys.version_info > (3, 0): 27 if isinstance(val, bytes): 28 val = val.decode('utf-8') 29 val = val.encode('raw_unicode_escape') 30 return struct.unpack('>I', val)[0] 31 32def fdt_cells_to_cpu(val, cells): 33 """Convert one or two cells to a long integer 34 35 Args: 36 Value to convert (array of one or more 4-character strings) 37 38 Return: 39 A native-endian long value 40 """ 41 if not cells: 42 return 0 43 out = long(fdt32_to_cpu(val[0])) 44 if cells == 2: 45 out = out << 32 | fdt32_to_cpu(val[1]) 46 return out 47 48def EnsureCompiled(fname): 49 """Compile an fdt .dts source file into a .dtb binary blob if needed. 50 51 Args: 52 fname: Filename (if .dts it will be compiled). It not it will be 53 left alone 54 55 Returns: 56 Filename of resulting .dtb file 57 """ 58 _, ext = os.path.splitext(fname) 59 if ext != '.dts': 60 return fname 61 62 dts_input = tools.GetOutputFilename('source.dts') 63 dtb_output = tools.GetOutputFilename('source.dtb') 64 65 search_paths = [os.path.join(os.getcwd(), 'include')] 66 root, _ = os.path.splitext(fname) 67 args = ['-E', '-P', '-x', 'assembler-with-cpp', '-D__ASSEMBLY__'] 68 args += ['-Ulinux'] 69 for path in search_paths: 70 args.extend(['-I', path]) 71 args += ['-o', dts_input, fname] 72 command.Run('cc', *args) 73 74 # If we don't have a directory, put it in the tools tempdir 75 search_list = [] 76 for path in search_paths: 77 search_list.extend(['-i', path]) 78 args = ['-I', 'dts', '-o', dtb_output, '-O', 'dtb', 79 '-W', 'no-unit_address_vs_reg'] 80 args.extend(search_list) 81 args.append(dts_input) 82 command.Run('dtc', *args) 83 return dtb_output 84 85def GetInt(node, propname, default=None): 86 prop = node.props.get(propname) 87 if not prop: 88 return default 89 value = fdt32_to_cpu(prop.value) 90 if type(value) == type(list): 91 raise ValueError("Node '%s' property '%' has list value: expecting" 92 "a single integer" % (node.name, propname)) 93 return value 94 95def GetString(node, propname, default=None): 96 prop = node.props.get(propname) 97 if not prop: 98 return default 99 value = prop.value 100 if type(value) == type(list): 101 raise ValueError("Node '%s' property '%' has list value: expecting" 102 "a single string" % (node.name, propname)) 103 return value 104 105def GetBool(node, propname, default=False): 106 if propname in node.props: 107 return True 108 return default 109