mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-27 05:23:34 +00:00
55bc080e79
Previously, dtoc could only process the top-level nodes which led to
device nodes in hierarchical trees to be ignored. E.g. the mmc0 node
in the following example would be ignored, as only the soc node was
processed:
/ {
soc {
mmc0 {
/* ... */
};
};
};
This introduces a recursive helper method ScanNode, which is used by
ScanTree to recursively parse the entire tree hierarchy.
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
402 lines
14 KiB
Python
Executable file
402 lines
14 KiB
Python
Executable file
#!/usr/bin/python
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#
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# Copyright (C) 2016 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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import copy
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from optparse import OptionError, OptionParser
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import os
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import struct
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import sys
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# Bring in the patman libraries
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our_path = os.path.dirname(os.path.realpath(__file__))
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sys.path.append(os.path.join(our_path, '../patman'))
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import fdt
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import fdt_select
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import fdt_util
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# When we see these properties we ignore them - i.e. do not create a structure 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 tyues 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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};
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STRUCT_PREFIX = 'dtd_'
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VAL_PREFIX = 'dtv_'
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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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Args:
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name: Name to convert
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Return:
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String containing the C version of this name
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"""
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str = name.replace('@', '_at_')
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str = str.replace('-', '_')
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str = str.replace(',', '_')
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str = str.replace('.', '_')
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str = str.replace('/', '__')
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return str
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def TabTo(num_tabs, str):
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if len(str) >= num_tabs * 8:
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return str + ' '
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return str + '\t' * (num_tabs - len(str) // 8)
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class DtbPlatdata:
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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
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_options: Command-line options
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_phandle_node: A dict of nodes indexed by phandle number (1, 2...)
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_outfile: The current output file (sys.stdout or a real file)
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_lines: Stashed list of output lines for outputting in the future
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_phandle_node: A dict of Nodes indexed by phandle (an integer)
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"""
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def __init__(self, dtb_fname, options):
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self._dtb_fname = dtb_fname
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self._valid_nodes = None
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self._options = options
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self._phandle_node = {}
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self._outfile = None
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self._lines = []
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def SetupOutput(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: 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, str):
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"""Output a string to the output file
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Args:
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str: String to output
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"""
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self._outfile.write(str)
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def Buf(self, str):
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"""Buffer up a string to send later
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Args:
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str: String to add to our 'buffer' list
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"""
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self._lines.append(str)
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def GetBuf(self):
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"""Get the contents of the output buffer, and clear it
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Returns:
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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 GetValue(self, type, 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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type: Data type (fdt_util)
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value: Data value, as a string of bytes
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"""
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if type == fdt.TYPE_INT:
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return '%#x' % fdt_util.fdt32_to_cpu(value)
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elif type == fdt.TYPE_BYTE:
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return '%#x' % ord(value[0])
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elif type == fdt.TYPE_STRING:
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return '"%s"' % value
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elif type == fdt.TYPE_BOOL:
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return 'true'
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def GetCompatName(self, node):
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"""Get a node's first compatible string as a C identifier
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Args:
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node: Node object to check
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Return:
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C identifier for the first compatible string
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"""
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compat = node.props['compatible'].value
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if type(compat) == list:
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compat = compat[0]
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return Conv_name_to_c(compat)
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def ScanDtb(self):
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"""Scan the device tree to obtain a tree of notes 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_select.FdtScan(self._dtb_fname)
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def ScanNode(self, root):
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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 options.include_disabled and not status or
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status.value != 'disabled'):
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self._valid_nodes.append(node)
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phandle_prop = node.props.get('phandle')
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if phandle_prop:
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phandle = phandle_prop.GetPhandle()
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self._phandle_node[phandle] = node
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# recurse to handle any subnodes
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self.ScanNode(node);
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def ScanTree(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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_phandle_node: A dict of Nodes indexed by phandle (an integer)
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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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self._phandle_node = {}
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self._valid_nodes = []
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return self.ScanNode(self.fdt.GetRoot());
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for node in self.fdt.GetRoot().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 options.include_disabled and not status or
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status.value != 'disabled'):
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node_list.append(node)
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phandle_prop = node.props.get('phandle')
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if phandle_prop:
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phandle = phandle_prop.GetPhandle()
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self._phandle_node[phandle] = node
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self._valid_nodes = node_list
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def IsPhandle(self, prop):
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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: Prop object to check
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Return:
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True if the object value contains phandles, else False
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"""
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if prop.name in ['clocks']:
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return True
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return False
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def ScanStructs(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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"""
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structs = {}
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for node in self._valid_nodes:
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node_name = self.GetCompatName(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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upto = 0
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for node in self._valid_nodes:
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node_name = self.GetCompatName(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] != '#':
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prop.Widen(struct[name])
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upto += 1
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return structs
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def GenerateStructs(self, structs):
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"""Generate struct defintions for the platform data
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This writes out the body of a header file consisting of structure
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definitions for node in self._valid_nodes. See the documentation in
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README.of-plat for more information.
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"""
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self.Out('#include <stdbool.h>\n')
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self.Out('#include <libfdt.h>\n')
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# Output the struct definition
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for name in sorted(structs):
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self.Out('struct %s%s {\n' % (STRUCT_PREFIX, name));
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for pname in sorted(structs[name]):
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prop = structs[name][pname]
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if self.IsPhandle(prop):
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# For phandles, include a reference to the target
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self.Out('\t%s%s[%d]' % (TabTo(2, 'struct phandle_2_cell'),
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Conv_name_to_c(prop.name),
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len(prop.value) / 2))
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else:
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ptype = TYPE_NAMES[prop.type]
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self.Out('\t%s%s' % (TabTo(2, ptype),
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Conv_name_to_c(prop.name)))
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if type(prop.value) == list:
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self.Out('[%d]' % len(prop.value))
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self.Out(';\n')
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self.Out('};\n')
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def GenerateTables(self):
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"""Generate device defintions for the platform data
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This writes out C platform data initialisation data and
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U_BOOT_DEVICE() declarations for each valid node. See the
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documentation in README.of-plat for more information.
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"""
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self.Out('#include <common.h>\n')
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self.Out('#include <dm.h>\n')
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self.Out('#include <dt-structs.h>\n')
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self.Out('\n')
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node_txt_list = []
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for node in self._valid_nodes:
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struct_name = self.GetCompatName(node)
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var_name = Conv_name_to_c(node.name)
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self.Buf('static struct %s%s %s%s = {\n' %
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(STRUCT_PREFIX, struct_name, VAL_PREFIX, var_name))
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for pname, prop in node.props.items():
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if pname in PROP_IGNORE_LIST or pname[0] == '#':
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continue
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ptype = TYPE_NAMES[prop.type]
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member_name = Conv_name_to_c(prop.name)
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self.Buf('\t%s= ' % TabTo(3, '.' + member_name))
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# Special handling for lists
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if type(prop.value) == list:
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self.Buf('{')
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vals = []
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# For phandles, output a reference to the platform data
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# of the target node.
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if self.IsPhandle(prop):
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# Process the list as pairs of (phandle, id)
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it = iter(prop.value)
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for phandle_cell, id_cell in zip(it, it):
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phandle = fdt_util.fdt32_to_cpu(phandle_cell)
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id = fdt_util.fdt32_to_cpu(id_cell)
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target_node = self._phandle_node[phandle]
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name = Conv_name_to_c(target_node.name)
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vals.append('{&%s%s, %d}' % (VAL_PREFIX, name, id))
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else:
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for val in prop.value:
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vals.append(self.GetValue(prop.type, val))
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self.Buf(', '.join(vals))
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self.Buf('}')
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else:
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self.Buf(self.GetValue(prop.type, prop.value))
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self.Buf(',\n')
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self.Buf('};\n')
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# Add a device declaration
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self.Buf('U_BOOT_DEVICE(%s) = {\n' % var_name)
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self.Buf('\t.name\t\t= "%s",\n' % struct_name)
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self.Buf('\t.platdata\t= &%s%s,\n' % (VAL_PREFIX, var_name))
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self.Buf('\t.platdata_size\t= sizeof(%s%s),\n' %
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(VAL_PREFIX, var_name))
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self.Buf('};\n')
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self.Buf('\n')
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# Output phandle target nodes first, since they may be referenced
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# by others
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if 'phandle' in node.props:
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self.Out(''.join(self.GetBuf()))
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else:
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node_txt_list.append(self.GetBuf())
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# Output all the nodes which are not phandle targets themselves, but
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# may reference them. This avoids the need for forward declarations.
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for node_txt in node_txt_list:
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self.Out(''.join(node_txt))
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if __name__ != "__main__":
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pass
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parser = OptionParser()
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parser.add_option('-d', '--dtb-file', action='store',
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help='Specify the .dtb input file')
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parser.add_option('--include-disabled', action='store_true',
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help='Include disabled nodes')
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parser.add_option('-o', '--output', action='store', default='-',
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help='Select output filename')
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(options, args) = parser.parse_args()
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if not args:
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raise ValueError('Please specify a command: struct, platdata')
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plat = DtbPlatdata(options.dtb_file, options)
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plat.ScanDtb()
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plat.ScanTree()
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plat.SetupOutput(options.output)
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structs = plat.ScanStructs()
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for cmd in args[0].split(','):
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if cmd == 'struct':
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plat.GenerateStructs(structs)
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elif cmd == 'platdata':
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plat.GenerateTables()
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else:
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raise ValueError("Unknown command '%s': (use: struct, platdata)" % cmd)
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