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#!/usr/bin/python -tt
# Copyright 2015-present Facebook. All Rights Reserved.
#
# This program file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program in a file named COPYING; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301 USA
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import argparse
import csv
import logging
import re
import sys
FUNC_SYMBOL = 'Function'
AND_SYMBOL = 'And'
OR_SYMBOL = 'Or'
BE_SYMBOL = 'BitsEqual'
BNE_SYMBOL = 'BitsNotEqual'
class CsvReader:
'''
A class for parsing the CSV files containing the pin mapping data.
'''
def __init__(self, path):
self.path = path
fileobj = open(path, 'r')
self.reader = csv.reader(fileobj, delimiter=b',', quotechar=b'"')
def next(self):
try:
line = self.reader.next()
except StopIteration:
return None
return line
class Expression(object):
def __init__(self, exp):
self.exp = exp
def parse(self):
# Strap[4,1:0]=100
m = re.match('([^\[]+)\[(.+)\](!*=)([01]+)', self.exp)
# ('Strap', '4,1:0', '=', '100')
try:
if len(m.groups()) != 4:
raise
scuname = m.group(1)
if scuname.lower() == 'strap':
scu = 0x70
elif scuname.startswith('SCU'):
scu = int(scuname[3:], 16)
bits = []
for bit in m.group(2).split(','):
if ':' in bit:
# it is a range
s, _, e = bit.partition(':')
ss = int(s)
ee = int(e)
if ss < ee:
assert 0 <= ss and ee <= 31
bits += range(ss, ee + 1)
else:
assert 0 <= ee and ss <= 31
bits += range(ee, ss + 1)
else:
bits += [int(bit)]
if m.group(3) == '!=':
cond = BNE_SYMBOL
else:
cond = BE_SYMBOL
value = int(m.group(4), 2)
return '%s(0x%x, %s, 0x%x)' \
% (cond, scu, sorted(bits, reverse=True), value)
except Exception as e:
logging.exception('Failed to parse expression "%s"', self.exp)
class Conditions(object):
def __init__(self, cond):
self.cond = re.sub('\s+', '', cond)
def _next_condition_pos(self, cur):
for idx in range(cur, len(self.cond)):
c = self.cond[idx]
if c == '&' or c == '|':
return idx
return -1
def _get_expression(self, exp):
if exp == '':
return None
return Expression(exp).parse()
def _parse(self, idx):
next_idx = self._next_condition_pos(idx + 1)
if next_idx == -1:
# end of string
return self._get_expression(self.cond[idx:])
prev = self._get_expression(self.cond[idx:next_idx])
if self.cond[next_idx] == '&':
cond = AND_SYMBOL
else:
cond = OR_SYMBOL
return '%s(%s, %s)' % (cond, prev, self._parse(next_idx + 1))
def parse(self):
return self._parse(0)
class AstGPIO(object):
def __init__(self, data):
self.data = data
self.undefined_func = 1
self.pins = {}
self.functions = set()
def _parse_conditions(self, cond):
return Conditions(cond).parse()
def _parse_funcs(self, parts):
func_fmt = FUNC_SYMBOL + '(\'{func}\', {cond})'
if len(parts) < 1:
return []
# Unable to process SIORD
if 'SIORD' in ' '.join(parts):
logging.warning('Unable to process SIORD. Ignore')
return []
func = parts[0]
if func == '':
# nothing after
return []
if func == '-':
func = 'UNDEFINED%d' % self.undefined_func
self.undefined_func += 1
assert func not in self.functions
self.functions.add(func)
if len(parts) == 1:
# just has the function name, the last function
return [func_fmt.format(func=func, cond=None)]
cond = self._parse_conditions(parts[1])
return [func_fmt.format(func=func, cond=cond)] \
+ self._parse_funcs(parts[2:])
def parse(self):
while True:
line = self.data.next()
if line is None:
break
logging.debug('Parsing line: %s' % line)
# V21,ROMA24,SCU88[28]=1 & SCU94[1]=0,VPOR6,SCU88[28]=1 & SCU94[1]=1,GPIOR4
pin = line[0]
if pin == "":
# empty line
continue
funcs = self._parse_funcs(line[1:])
logging.debug('%s: %s' % (pin, funcs))
assert pin not in self.pins
self.pins[pin] = funcs
def print(self, out):
for pin in sorted(self.pins):
if len(self.pins[pin]) == 0:
logging.warning('Pin "%s" has no function defined. Skip' % pin)
continue
out.write(' \'%s\': [\n %s\n ],\n'
% (pin, ',\n '.join(self.pins[pin])))
def main():
ap = argparse.ArgumentParser()
ap.add_argument('data', help='The GPIO data file')
args = ap.parse_args()
logging.basicConfig(level=logging.INFO, format='%(asctime)s: %(message)s')
gpio = AstGPIO(CsvReader(args.data))
gpio.parse()
gpio.print(sys.stdout)
rc = main()
sys.exit(rc)
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