mirror of
https://github.com/AsahiLinux/u-boot
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456 lines
16 KiB
Python
456 lines
16 KiB
Python
#!/usr/bin/python
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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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# SPDX-License-Identifier: GPL-2.0+
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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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"""
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import copy
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import sys
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import fdt
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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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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: 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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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: Tab stop to obtain (0 = column 0, 1 = column 8, etc.)
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line: Line of text to append to
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Returns:
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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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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 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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return '%#x' % ord(value[0])
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elif ftype == fdt.TYPE_STRING:
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return '"%s"' % value
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elif ftype == fdt.TYPE_BOOL:
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return 'true'
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def get_compat_name(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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Tuple:
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C identifier for 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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"""
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compat = node.props['compatible'].value
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aliases = []
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if isinstance(compat, list):
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compat, aliases = compat[0], compat[1:]
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return conv_name_to_c(compat), [conv_name_to_c(a) for a in aliases]
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def is_phandle(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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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
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_include_disabled: true to include nodes marked status = "disabled"
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_phandle_nodes: 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_nodes: A dict of Nodes indexed by phandle (an integer)
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"""
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def __init__(self, dtb_fname, include_disabled):
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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._phandle_nodes = {}
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self._outfile = None
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self._lines = []
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self._aliases = {}
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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: 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: 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: 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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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 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):
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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 and each phandle to
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self._phandle_nodes.
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Args:
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root: Root node for scan
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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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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_nodes[phandle] = node
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# recurse to handle any subnodes
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self.scan_node(node)
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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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_phandle_nodes: 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_nodes = {}
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self._valid_nodes = []
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return self.scan_node(self._fdt.GetRoot())
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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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"""
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structs = {}
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for node in self._valid_nodes:
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node_name, _ = get_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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upto = 0
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for node in self._valid_nodes:
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node_name, _ = get_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] != '#':
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prop.Widen(struct[name])
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upto += 1
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struct_name, aliases = get_compat_name(node)
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for alias in aliases:
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self._aliases[alias] = struct_name
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return structs
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def scan_phandles(self):
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"""Figure out what phandles each node uses
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We need to be careful when outputing nodes that use phandles since
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they must come after the declaration of the phandles in the C file.
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Otherwise we get a compiler error since the phandle struct is not yet
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declared.
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This function adds to each node a list of phandle nodes that the node
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depends on. This allows us to output things in the right order.
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"""
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for node in self._valid_nodes:
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node.phandles = set()
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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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if isinstance(prop.value, list):
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if is_phandle(prop):
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# Process the list as pairs of (phandle, id)
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value_it = iter(prop.value)
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for phandle_cell, _ in zip(value_it, value_it):
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phandle = fdt_util.fdt32_to_cpu(phandle_cell)
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target_node = self._phandle_nodes[phandle]
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node.phandles.add(target_node)
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def generate_structs(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 is_phandle(prop):
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# For phandles, include a reference to the target
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self.out('\t%s%s[%d]' % (tab_to(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' % (tab_to(2, ptype),
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conv_name_to_c(prop.name)))
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if isinstance(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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for alias, struct_name in self._aliases.iteritems():
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self.out('#define %s%s %s%s\n'% (STRUCT_PREFIX, alias,
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STRUCT_PREFIX, struct_name))
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def output_node(self, node):
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"""Output the C code for a node
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Args:
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node: node to output
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"""
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struct_name, _ = get_compat_name(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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member_name = conv_name_to_c(prop.name)
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self.buf('\t%s= ' % tab_to(3, '.' + member_name))
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# Special handling for lists
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if isinstance(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 is_phandle(prop):
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# Process the list as pairs of (phandle, id)
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value_it = iter(prop.value)
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for phandle_cell, id_cell in zip(value_it, value_it):
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phandle = fdt_util.fdt32_to_cpu(phandle_cell)
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id_num = fdt_util.fdt32_to_cpu(id_cell)
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target_node = self._phandle_nodes[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_num))
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else:
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for val in prop.value:
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vals.append(get_value(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(get_value(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' % (VAL_PREFIX, var_name))
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self.buf('};\n')
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self.buf('\n')
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self.out(''.join(self.get_buf()))
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def generate_tables(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. Where a node has
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multiple compatible strings, a #define is used to make them equivalent.
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See the documentation in doc/driver-model/of-plat.txt for more
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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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nodes_to_output = list(self._valid_nodes)
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# Keep outputing nodes until there is none left
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while nodes_to_output:
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node = nodes_to_output[0]
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# Output all the node's dependencies first
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for req_node in node.phandles:
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if req_node in nodes_to_output:
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self.output_node(req_node)
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nodes_to_output.remove(req_node)
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self.output_node(node)
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nodes_to_output.remove(node)
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def run_steps(args, dtb_file, include_disabled, output):
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"""Run all the steps of the dtoc tool
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Args:
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args: List of non-option arguments provided to the problem
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dtb_file: Filename of dtb file to process
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include_disabled: True to include disabled nodes
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output: Name of output file
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"""
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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(dtb_file, include_disabled)
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plat.scan_dtb()
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plat.scan_tree()
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plat.setup_output(output)
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structs = plat.scan_structs()
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plat.scan_phandles()
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for cmd in args[0].split(','):
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if cmd == 'struct':
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plat.generate_structs(structs)
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elif cmd == 'platdata':
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plat.generate_tables()
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else:
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raise ValueError("Unknown command '%s': (use: struct, platdata)" %
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cmd)
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