Added Yosys netlist json wrapper/generator

scripts/python-skywater-pdk/skywater_pdk/cell/generate/netlistjson.py

@@ -0,0 +1,113 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright 2020 The SkyWater PDK Authors.
+#
+# Use of this source code is governed by the Apache 2.0
+# license that can be found in the LICENSE file or at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+
+
+import csv
+import json
+import os
+import sys
+import argparse
+import pathlib
+import glob
+import subprocess
+
+def write_netlistsvg(cellpath, define_data):
+    ''' Generates netlist json for a given cell.
+
+    Args:
+        cellpath - path to a cell [str of pathlib.Path]
+        define_data - cell definition data [dic]
+    '''
+
+    netlist_json = os.path.join(cellpath, define_data['file_prefix']+'.json')
+    # verilog source: functional description used
+    verilog      = os.path.join(cellpath, define_data['file_prefix']+'.functional.v')
+    if not os.path.exists(verilog):
+        print("No verilog file in", cellpath)
+    assert os.path.exists(verilog), verilog
+
+    yosyscmd = ['yosys', '-D NO_PRIMITIVES', '-D UNIT_DELAY #1', '-p']
+    yosyscmd.append ('prep -top ' + define_data['verilog_name'] + '; write_json ' + netlist_json)
+    yosyscmd.append (verilog)
+    if subprocess.call( yosyscmd ) :
+      yosyscmd[2] = '"' + yosyscmd[2] + '"'
+      print (''.join(yosyscmd))
+      raise ChildProcessError(define_data['file_prefix'],"yosys execution failed")
+
+def process(cellpath):
+    ''' Processes cell indicated by path.
+        Opens cell definiton and calls further processing
+
+    Args:
+        cellpath - path to a cell [str of pathlib.Path]
+    '''
+
+    print()
+    print(cellpath)
+    define_json = os.path.join(cellpath, 'definition.json')
+    if not os.path.exists(define_json):
+        print("No definition.json in", cellpath)
+    assert os.path.exists(define_json), define_json
+    define_data = json.load(open(define_json))
+
+    if define_data['type'] == 'cell':
+        write_netlistsvg(cellpath, define_data)
+
+    return
+
+
+def main():
+    ''' Generates netlist json from cell verilog file.'''
+
+    prereq_txt = 'prerequisities:\n  yosys'
+    output_txt = 'output:\n  generates [cell_prefix].json'
+    allcellpath = '../../../libraries/*/latest/cells/*'
+
+    parser = argparse.ArgumentParser(
+            description = main.__doc__,
+            epilog = prereq_txt +'\n\n'+ output_txt,
+            formatter_class=argparse.RawDescriptionHelpFormatter)
+    parser.add_argument(
+            "--all_libs",
+            help="process all cells in "+allcellpath,
+            action="store_true")
+    parser.add_argument(
+            "cell_dir",
+            help="path to the cell directory",
+            type=pathlib.Path,
+            nargs="*")
+
+    args = parser.parse_args()
+
+    if args.all_libs:
+        path = pathlib.Path(allcellpath).expanduser()
+        parts = path.parts[1:] if path.is_absolute() else path.parts
+        paths = pathlib.Path(path.root).glob(str(pathlib.Path("").joinpath(*parts)))
+        args.cell_dir = list(paths)
+
+    cell_dirs = [d.resolve() for d in args.cell_dir if d.is_dir()]
+
+    errors = 0
+    for d in cell_dirs:
+        try:
+            process(d)
+        except KeyboardInterrupt:
+            sys.exit(1)
+        except (AssertionError, FileNotFoundError, ChildProcessError) as ex:
+            print (f'Error: {type(ex).__name__}')
+            print (f'{ex.args}')
+            errors +=1
+    print (f'\n{len(cell_dirs)} files processed, {errors} errors.')
+    return 0 if errors else 1
+
+if __name__ == "__main__":
+    sys.exit(main())
+