749 lines
27 KiB
Python
749 lines
27 KiB
Python
#!/usr/bin/python
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# SPDX-License-Identifier: GPL-2.0+
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#
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# Copyright (C) 2017 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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"""Device tree to platform data class
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This supports converting device tree data to C structures definitions and
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static data.
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See doc/driver-model/of-plat.rst for more informaiton
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"""
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import collections
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import copy
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import os
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import re
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import sys
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from dtoc import fdt
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from dtoc import fdt_util
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# When we see these properties we ignore them - i.e. do not create a structure
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# member
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PROP_IGNORE_LIST = [
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'#address-cells',
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'#gpio-cells',
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'#size-cells',
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'compatible',
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'linux,phandle',
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"status",
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'phandle',
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'u-boot,dm-pre-reloc',
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'u-boot,dm-tpl',
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'u-boot,dm-spl',
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]
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# C type declarations for the types we support
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TYPE_NAMES = {
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fdt.Type.INT: 'fdt32_t',
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fdt.Type.BYTE: 'unsigned char',
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fdt.Type.STRING: 'const char *',
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fdt.Type.BOOL: 'bool',
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fdt.Type.INT64: 'fdt64_t',
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}
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STRUCT_PREFIX = 'dtd_'
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VAL_PREFIX = 'dtv_'
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# This holds information about a property which includes phandles.
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#
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# max_args: integer: Maximum number or arguments that any phandle uses (int).
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# args: Number of args for each phandle in the property. The total number of
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# phandles is len(args). This is a list of integers.
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PhandleInfo = collections.namedtuple('PhandleInfo', ['max_args', 'args'])
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# Holds a single phandle link, allowing a C struct value to be assigned to point
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# to a device
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#
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# var_node: C variable to assign (e.g. 'dtv_mmc.clocks[0].node')
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# dev_name: Name of device to assign to (e.g. 'clock')
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PhandleLink = collections.namedtuple('PhandleLink', ['var_node', 'dev_name'])
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def conv_name_to_c(name):
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"""Convert a device-tree name to a C identifier
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This uses multiple replace() calls instead of re.sub() since it is faster
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(400ms for 1m calls versus 1000ms for the 're' version).
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Args:
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name (str): Name to convert
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Return:
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str: String containing the C version of this name
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"""
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new = name.replace('@', '_at_')
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new = new.replace('-', '_')
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new = new.replace(',', '_')
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new = new.replace('.', '_')
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return new
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def tab_to(num_tabs, line):
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"""Append tabs to a line of text to reach a tab stop.
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Args:
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num_tabs (int): Tab stop to obtain (0 = column 0, 1 = column 8, etc.)
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line (str): Line of text to append to
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Returns:
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str: line with the correct number of tabs appeneded. If the line already
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extends past that tab stop then a single space is appended.
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"""
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if len(line) >= num_tabs * 8:
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return line + ' '
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return line + '\t' * (num_tabs - len(line) // 8)
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def get_value(ftype, value):
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"""Get a value as a C expression
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For integers this returns a byte-swapped (little-endian) hex string
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For bytes this returns a hex string, e.g. 0x12
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For strings this returns a literal string enclosed in quotes
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For booleans this return 'true'
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Args:
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ftype (fdt.Type): Data type (fdt_util)
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value (bytes): Data value, as a string of bytes
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Returns:
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str: String representation of the value
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"""
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if ftype == fdt.Type.INT:
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return '%#x' % fdt_util.fdt32_to_cpu(value)
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elif ftype == fdt.Type.BYTE:
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char = value[0]
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return '%#x' % (ord(char) if isinstance(char, str) else char)
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elif ftype == fdt.Type.STRING:
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# Handle evil ACPI backslashes by adding another backslash before them.
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# So "\\_SB.GPO0" in the device tree effectively stays like that in C
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return '"%s"' % value.replace('\\', '\\\\')
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elif ftype == fdt.Type.BOOL:
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return 'true'
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else: # ftype == fdt.Type.INT64:
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return '%#x' % value
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def get_compat_name(node):
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"""Get the node's list of compatible string as a C identifiers
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Args:
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node (fdt.Node): Node object to check
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Return:
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List of C identifiers for all the compatible strings
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"""
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compat = node.props['compatible'].value
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if not isinstance(compat, list):
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compat = [compat]
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return [conv_name_to_c(c) for c in compat]
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class DtbPlatdata(object):
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"""Provide a means to convert device tree binary data to platform data
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The output of this process is C structures which can be used in space-
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constrained encvironments where the ~3KB code overhead of device tree
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code is not affordable.
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Properties:
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_fdt: Fdt object, referencing the device tree
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_dtb_fname: Filename of the input device tree binary file
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_valid_nodes: A list of Node object with compatible strings. The list
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is ordered by conv_name_to_c(node.name)
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_include_disabled: true to include nodes marked status = "disabled"
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_outfile: The current output file (sys.stdout or a real file)
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_warning_disabled: true to disable warnings about driver names not found
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_lines: Stashed list of output lines for outputting in the future
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_drivers: List of valid driver names found in drivers/
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_driver_aliases: Dict that holds aliases for driver names
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key: Driver alias declared with
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U_BOOT_DRIVER_ALIAS(driver_alias, driver_name)
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value: Driver name declared with U_BOOT_DRIVER(driver_name)
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_drivers_additional: List of additional drivers to use during scanning
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"""
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def __init__(self, dtb_fname, include_disabled, warning_disabled,
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drivers_additional=None):
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self._fdt = None
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self._dtb_fname = dtb_fname
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self._valid_nodes = None
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self._include_disabled = include_disabled
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self._outfile = None
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self._warning_disabled = warning_disabled
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self._lines = []
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self._drivers = []
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self._driver_aliases = {}
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self._drivers_additional = drivers_additional or []
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def get_normalized_compat_name(self, node):
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"""Get a node's normalized compat name
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Returns a valid driver name by retrieving node's list of compatible
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string as a C identifier and performing a check against _drivers
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and a lookup in driver_aliases printing a warning in case of failure.
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Args:
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node: Node object to check
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Return:
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Tuple:
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Driver name associated with the first compatible string
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List of C identifiers for all the other compatible strings
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(possibly empty)
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In case of no match found, the return will be the same as
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get_compat_name()
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"""
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compat_list_c = get_compat_name(node)
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for compat_c in compat_list_c:
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if not compat_c in self._drivers:
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compat_c = self._driver_aliases.get(compat_c)
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if not compat_c:
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continue
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aliases_c = compat_list_c
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if compat_c in aliases_c:
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aliases_c.remove(compat_c)
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return compat_c, aliases_c
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if not self._warning_disabled:
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print('WARNING: the driver %s was not found in the driver list'
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% (compat_list_c[0]))
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return compat_list_c[0], compat_list_c[1:]
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def setup_output(self, fname):
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"""Set up the output destination
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Once this is done, future calls to self.out() will output to this
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file.
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Args:
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fname (str): Filename to send output to, or '-' for stdout
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"""
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if fname == '-':
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self._outfile = sys.stdout
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else:
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self._outfile = open(fname, 'w')
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def out(self, line):
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"""Output a string to the output file
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Args:
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line (str): String to output
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"""
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self._outfile.write(line)
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def buf(self, line):
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"""Buffer up a string to send later
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Args:
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line (str): String to add to our 'buffer' list
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"""
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self._lines.append(line)
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def get_buf(self):
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"""Get the contents of the output buffer, and clear it
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Returns:
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list(str): The output buffer, which is then cleared for future use
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"""
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lines = self._lines
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self._lines = []
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return lines
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def out_header(self):
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"""Output a message indicating that this is an auto-generated file"""
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self.out('''/*
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* DO NOT MODIFY
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*
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* This file was generated by dtoc from a .dtb (device tree binary) file.
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*/
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''')
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def get_phandle_argc(self, prop, node_name):
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"""Check if a node contains phandles
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We have no reliable way of detecting whether a node uses a phandle
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or not. As an interim measure, use a list of known property names.
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Args:
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prop (fdt.Prop): Prop object to check
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node_name (str): Node name, only used for raising an error
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Returns:
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int or None: Number of argument cells is this is a phandle,
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else None
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Raises:
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ValueError: if the phandle cannot be parsed or the required property
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is not present
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"""
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if prop.name in ['clocks', 'cd-gpios']:
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if not isinstance(prop.value, list):
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prop.value = [prop.value]
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val = prop.value
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i = 0
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max_args = 0
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args = []
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while i < len(val):
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phandle = fdt_util.fdt32_to_cpu(val[i])
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# If we get to the end of the list, stop. This can happen
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# since some nodes have more phandles in the list than others,
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# but we allocate enough space for the largest list. So those
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# nodes with shorter lists end up with zeroes at the end.
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if not phandle:
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break
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target = self._fdt.phandle_to_node.get(phandle)
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if not target:
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raise ValueError("Cannot parse '%s' in node '%s'" %
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(prop.name, node_name))
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cells = None
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for prop_name in ['#clock-cells', '#gpio-cells']:
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cells = target.props.get(prop_name)
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if cells:
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break
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if not cells:
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raise ValueError("Node '%s' has no cells property" %
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(target.name))
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num_args = fdt_util.fdt32_to_cpu(cells.value)
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max_args = max(max_args, num_args)
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args.append(num_args)
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i += 1 + num_args
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return PhandleInfo(max_args, args)
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return None
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def scan_driver(self, fname):
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"""Scan a driver file to build a list of driver names and aliases
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This procedure will populate self._drivers and self._driver_aliases
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Args
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fname: Driver filename to scan
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"""
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with open(fname, encoding='utf-8') as inf:
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try:
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buff = inf.read()
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except UnicodeDecodeError:
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# This seems to happen on older Python versions
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print("Skipping file '%s' due to unicode error" % fname)
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return
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# The following re will search for driver names declared as
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# U_BOOT_DRIVER(driver_name)
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drivers = re.findall('U_BOOT_DRIVER\((.*)\)', buff)
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for driver in drivers:
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self._drivers.append(driver)
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# The following re will search for driver aliases declared as
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# U_BOOT_DRIVER_ALIAS(alias, driver_name)
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driver_aliases = re.findall(
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'U_BOOT_DRIVER_ALIAS\(\s*(\w+)\s*,\s*(\w+)\s*\)',
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buff)
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for alias in driver_aliases: # pragma: no cover
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if len(alias) != 2:
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continue
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self._driver_aliases[alias[1]] = alias[0]
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def scan_drivers(self):
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"""Scan the driver folders to build a list of driver names and aliases
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This procedure will populate self._drivers and self._driver_aliases
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"""
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basedir = sys.argv[0].replace('tools/dtoc/dtoc', '')
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if basedir == '':
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basedir = './'
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for (dirpath, _, filenames) in os.walk(basedir):
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for fname in filenames:
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if not fname.endswith('.c'):
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continue
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self.scan_driver(dirpath + '/' + fname)
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for fname in self._drivers_additional:
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if not isinstance(fname, str) or len(fname) == 0:
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continue
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if fname[0] == '/':
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self.scan_driver(fname)
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else:
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self.scan_driver(basedir + '/' + fname)
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def scan_dtb(self):
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"""Scan the device tree to obtain a tree of nodes and properties
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Once this is done, self._fdt.GetRoot() can be called to obtain the
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device tree root node, and progress from there.
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"""
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self._fdt = fdt.FdtScan(self._dtb_fname)
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def scan_node(self, root, valid_nodes):
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"""Scan a node and subnodes to build a tree of node and phandle info
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This adds each node to self._valid_nodes.
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Args:
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root: Root node for scan
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valid_nodes: List of Node objects to add to
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"""
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for node in root.subnodes:
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if 'compatible' in node.props:
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status = node.props.get('status')
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if (not self._include_disabled and not status or
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status.value != 'disabled'):
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valid_nodes.append(node)
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# recurse to handle any subnodes
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self.scan_node(node, valid_nodes)
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def scan_tree(self):
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"""Scan the device tree for useful information
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This fills in the following properties:
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_valid_nodes: A list of nodes we wish to consider include in the
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platform data
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"""
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valid_nodes = []
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self.scan_node(self._fdt.GetRoot(), valid_nodes)
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self._valid_nodes = sorted(valid_nodes,
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key=lambda x: conv_name_to_c(x.name))
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for idx, node in enumerate(self._valid_nodes):
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node.idx = idx
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@staticmethod
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def get_num_cells(node):
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"""Get the number of cells in addresses and sizes for this node
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Args:
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node (fdt.None): Node to check
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Returns:
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Tuple:
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Number of address cells for this node
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Number of size cells for this node
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"""
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parent = node.parent
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num_addr, num_size = 2, 2
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if parent:
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addr_prop = parent.props.get('#address-cells')
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size_prop = parent.props.get('#size-cells')
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if addr_prop:
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num_addr = fdt_util.fdt32_to_cpu(addr_prop.value)
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if size_prop:
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num_size = fdt_util.fdt32_to_cpu(size_prop.value)
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return num_addr, num_size
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def scan_reg_sizes(self):
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"""Scan for 64-bit 'reg' properties and update the values
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This finds 'reg' properties with 64-bit data and converts the value to
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an array of 64-values. This allows it to be output in a way that the
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C code can read.
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"""
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for node in self._valid_nodes:
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reg = node.props.get('reg')
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if not reg:
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continue
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num_addr, num_size = self.get_num_cells(node)
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total = num_addr + num_size
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if reg.type != fdt.Type.INT:
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raise ValueError("Node '%s' reg property is not an int" %
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node.name)
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if len(reg.value) % total:
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raise ValueError(
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"Node '%s' reg property has %d cells "
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'which is not a multiple of na + ns = %d + %d)' %
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(node.name, len(reg.value), num_addr, num_size))
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reg.num_addr = num_addr
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reg.num_size = num_size
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if num_addr != 1 or num_size != 1:
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reg.type = fdt.Type.INT64
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i = 0
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new_value = []
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val = reg.value
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if not isinstance(val, list):
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val = [val]
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while i < len(val):
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addr = fdt_util.fdt_cells_to_cpu(val[i:], reg.num_addr)
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i += num_addr
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size = fdt_util.fdt_cells_to_cpu(val[i:], reg.num_size)
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i += num_size
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new_value += [addr, size]
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reg.value = new_value
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def scan_structs(self):
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"""Scan the device tree building up the C structures we will use.
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Build a dict keyed by C struct name containing a dict of Prop
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object for each struct field (keyed by property name). Where the
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same struct appears multiple times, try to use the 'widest'
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property, i.e. the one with a type which can express all others.
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Once the widest property is determined, all other properties are
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updated to match that width.
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Returns:
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dict containing structures:
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key (str): Node name, as a C identifier
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value: dict containing structure fields:
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key (str): Field name
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value: Prop object with field information
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"""
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structs = collections.OrderedDict()
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for node in self._valid_nodes:
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node_name, _ = self.get_normalized_compat_name(node)
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fields = {}
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# Get a list of all the valid properties in this node.
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for name, prop in node.props.items():
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if name not in PROP_IGNORE_LIST and name[0] != '#':
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fields[name] = copy.deepcopy(prop)
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# If we've seen this node_name before, update the existing struct.
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if node_name in structs:
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struct = structs[node_name]
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for name, prop in fields.items():
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oldprop = struct.get(name)
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if oldprop:
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oldprop.Widen(prop)
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else:
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struct[name] = prop
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# Otherwise store this as a new struct.
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else:
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structs[node_name] = fields
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for node in self._valid_nodes:
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node_name, _ = self.get_normalized_compat_name(node)
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struct = structs[node_name]
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for name, prop in node.props.items():
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if name not in PROP_IGNORE_LIST and name[0] != '#':
|
|
prop.Widen(struct[name])
|
|
|
|
return structs
|
|
|
|
def scan_phandles(self):
|
|
"""Figure out what phandles each node uses
|
|
|
|
We need to be careful when outputing nodes that use phandles since
|
|
they must come after the declaration of the phandles in the C file.
|
|
Otherwise we get a compiler error since the phandle struct is not yet
|
|
declared.
|
|
|
|
This function adds to each node a list of phandle nodes that the node
|
|
depends on. This allows us to output things in the right order.
|
|
"""
|
|
for node in self._valid_nodes:
|
|
node.phandles = set()
|
|
for pname, prop in node.props.items():
|
|
if pname in PROP_IGNORE_LIST or pname[0] == '#':
|
|
continue
|
|
info = self.get_phandle_argc(prop, node.name)
|
|
if info:
|
|
# Process the list as pairs of (phandle, id)
|
|
pos = 0
|
|
for args in info.args:
|
|
phandle_cell = prop.value[pos]
|
|
phandle = fdt_util.fdt32_to_cpu(phandle_cell)
|
|
target_node = self._fdt.phandle_to_node[phandle]
|
|
node.phandles.add(target_node)
|
|
pos += 1 + args
|
|
|
|
|
|
def generate_structs(self, structs):
|
|
"""Generate struct defintions for the platform data
|
|
|
|
This writes out the body of a header file consisting of structure
|
|
definitions for node in self._valid_nodes. See the documentation in
|
|
doc/driver-model/of-plat.rst for more information.
|
|
|
|
Args:
|
|
structs: dict containing structures:
|
|
key (str): Node name, as a C identifier
|
|
value: dict containing structure fields:
|
|
key (str): Field name
|
|
value: Prop object with field information
|
|
|
|
"""
|
|
self.out_header()
|
|
self.out('#include <stdbool.h>\n')
|
|
self.out('#include <linux/libfdt.h>\n')
|
|
|
|
# Output the struct definition
|
|
for name in sorted(structs):
|
|
self.out('struct %s%s {\n' % (STRUCT_PREFIX, name))
|
|
for pname in sorted(structs[name]):
|
|
prop = structs[name][pname]
|
|
info = self.get_phandle_argc(prop, structs[name])
|
|
if info:
|
|
# For phandles, include a reference to the target
|
|
struct_name = 'struct phandle_%d_arg' % info.max_args
|
|
self.out('\t%s%s[%d]' % (tab_to(2, struct_name),
|
|
conv_name_to_c(prop.name),
|
|
len(info.args)))
|
|
else:
|
|
ptype = TYPE_NAMES[prop.type]
|
|
self.out('\t%s%s' % (tab_to(2, ptype),
|
|
conv_name_to_c(prop.name)))
|
|
if isinstance(prop.value, list):
|
|
self.out('[%d]' % len(prop.value))
|
|
self.out(';\n')
|
|
self.out('};\n')
|
|
|
|
def output_node(self, node):
|
|
"""Output the C code for a node
|
|
|
|
Args:
|
|
node (fdt.Node): node to output
|
|
"""
|
|
def _output_list(node, prop):
|
|
"""Output the C code for a devicetree property that holds a list
|
|
|
|
Args:
|
|
node (fdt.Node): Node to output
|
|
prop (fdt.Prop): Prop to output
|
|
"""
|
|
self.buf('{')
|
|
vals = []
|
|
# For phandles, output a reference to the platform data
|
|
# of the target node.
|
|
info = self.get_phandle_argc(prop, node.name)
|
|
if info:
|
|
# Process the list as pairs of (phandle, id)
|
|
pos = 0
|
|
for args in info.args:
|
|
phandle_cell = prop.value[pos]
|
|
phandle = fdt_util.fdt32_to_cpu(phandle_cell)
|
|
target_node = self._fdt.phandle_to_node[phandle]
|
|
arg_values = []
|
|
for i in range(args):
|
|
arg_values.append(
|
|
str(fdt_util.fdt32_to_cpu(prop.value[pos + 1 + i])))
|
|
pos += 1 + args
|
|
vals.append('\t{%d, {%s}}' % (target_node.idx,
|
|
', '.join(arg_values)))
|
|
for val in vals:
|
|
self.buf('\n\t\t%s,' % val)
|
|
else:
|
|
for val in prop.value:
|
|
vals.append(get_value(prop.type, val))
|
|
|
|
# Put 8 values per line to avoid very long lines.
|
|
for i in range(0, len(vals), 8):
|
|
if i:
|
|
self.buf(',\n\t\t')
|
|
self.buf(', '.join(vals[i:i + 8]))
|
|
self.buf('}')
|
|
|
|
struct_name, _ = self.get_normalized_compat_name(node)
|
|
var_name = conv_name_to_c(node.name)
|
|
self.buf('/* Node %s index %d */\n' % (node.path, node.idx))
|
|
self.buf('static struct %s%s %s%s = {\n' %
|
|
(STRUCT_PREFIX, struct_name, VAL_PREFIX, var_name))
|
|
for pname in sorted(node.props):
|
|
prop = node.props[pname]
|
|
if pname in PROP_IGNORE_LIST or pname[0] == '#':
|
|
continue
|
|
member_name = conv_name_to_c(prop.name)
|
|
self.buf('\t%s= ' % tab_to(3, '.' + member_name))
|
|
|
|
# Special handling for lists
|
|
if isinstance(prop.value, list):
|
|
_output_list(node, prop)
|
|
else:
|
|
self.buf(get_value(prop.type, prop.value))
|
|
self.buf(',\n')
|
|
self.buf('};\n')
|
|
|
|
# Add a device declaration
|
|
self.buf('U_BOOT_DEVICE(%s) = {\n' % var_name)
|
|
self.buf('\t.name\t\t= "%s",\n' % struct_name)
|
|
self.buf('\t.platdata\t= &%s%s,\n' % (VAL_PREFIX, var_name))
|
|
self.buf('\t.platdata_size\t= sizeof(%s%s),\n' % (VAL_PREFIX, var_name))
|
|
idx = -1
|
|
if node.parent and node.parent in self._valid_nodes:
|
|
idx = node.parent.idx
|
|
self.buf('\t.parent_idx\t= %d,\n' % idx)
|
|
self.buf('};\n')
|
|
self.buf('\n')
|
|
|
|
self.out(''.join(self.get_buf()))
|
|
|
|
def generate_tables(self):
|
|
"""Generate device defintions for the platform data
|
|
|
|
This writes out C platform data initialisation data and
|
|
U_BOOT_DEVICE() declarations for each valid node. Where a node has
|
|
multiple compatible strings, a #define is used to make them equivalent.
|
|
|
|
See the documentation in doc/driver-model/of-plat.rst for more
|
|
information.
|
|
"""
|
|
self.out_header()
|
|
self.out('/* Allow use of U_BOOT_DEVICE() in this file */\n')
|
|
self.out('#define DT_PLATDATA_C\n')
|
|
self.out('\n')
|
|
self.out('#include <common.h>\n')
|
|
self.out('#include <dm.h>\n')
|
|
self.out('#include <dt-structs.h>\n')
|
|
self.out('\n')
|
|
nodes_to_output = list(self._valid_nodes)
|
|
|
|
# Keep outputing nodes until there is none left
|
|
while nodes_to_output:
|
|
node = nodes_to_output[0]
|
|
# Output all the node's dependencies first
|
|
for req_node in node.phandles:
|
|
if req_node in nodes_to_output:
|
|
self.output_node(req_node)
|
|
nodes_to_output.remove(req_node)
|
|
self.output_node(node)
|
|
nodes_to_output.remove(node)
|
|
|
|
# Define dm_populate_phandle_data() which will add the linking between
|
|
# nodes using DM_GET_DEVICE
|
|
# dtv_dmc_at_xxx.clocks[0].node = DM_GET_DEVICE(clock_controller_at_xxx)
|
|
self.buf('void dm_populate_phandle_data(void) {\n')
|
|
self.buf('}\n')
|
|
|
|
self.out(''.join(self.get_buf()))
|
|
|
|
def run_steps(args, dtb_file, include_disabled, output, warning_disabled=False,
|
|
drivers_additional=None):
|
|
"""Run all the steps of the dtoc tool
|
|
|
|
Args:
|
|
args (list): List of non-option arguments provided to the problem
|
|
dtb_file (str): Filename of dtb file to process
|
|
include_disabled (bool): True to include disabled nodes
|
|
output (str): Name of output file
|
|
warning_disabled (bool): True to avoid showing warnings about missing
|
|
drivers
|
|
_drivers_additional (list): List of additional drivers to use during
|
|
scanning
|
|
Raises:
|
|
ValueError: if args has no command, or an unknown command
|
|
"""
|
|
if not args:
|
|
raise ValueError('Please specify a command: struct, platdata')
|
|
|
|
plat = DtbPlatdata(dtb_file, include_disabled, warning_disabled,
|
|
drivers_additional)
|
|
plat.scan_drivers()
|
|
plat.scan_dtb()
|
|
plat.scan_tree()
|
|
plat.scan_reg_sizes()
|
|
plat.setup_output(output)
|
|
structs = plat.scan_structs()
|
|
plat.scan_phandles()
|
|
|
|
for cmd in args[0].split(','):
|
|
if cmd == 'struct':
|
|
plat.generate_structs(structs)
|
|
elif cmd == 'platdata':
|
|
plat.generate_tables()
|
|
else:
|
|
raise ValueError("Unknown command '%s': (use: struct, platdata)" %
|
|
cmd)
|