Initial commit of public repository open_pdks.
diff --git a/sky130/custom/scripts/fixspice.py b/sky130/custom/scripts/fixspice.py
new file mode 100755
index 0000000..92cca88
--- /dev/null
+++ b/sky130/custom/scripts/fixspice.py
@@ -0,0 +1,96 @@
+#!/bin/env python3
+#
+# fixspice ---
+#
+# This script fixes problems in the SkyWater SPICE models. This should be
+# made obsolete by the forthcoming set of models from the foundry, but the
+# script will get the original set working with ngspice.
+#
+# This script is a filter to be run by setting the name of this script as
+# the value to "filter=" for the model install in the s8 Makefile.
+
+import re
+import os
+import sys
+
+def filter(inname, outname):
+
+ # Read input
+ try:
+ with open(inname, 'r') as inFile:
+ spitext = inFile.read()
+ # (Don't) unwrap continuation lines
+ # spilines = spitext.replace('\n+', ' ').splitlines()
+ spilines = spitext.splitlines()
+ except:
+ print('fixspice.py: failed to open ' + fnmIn + ' for reading.', file=sys.stderr)
+ return 1
+
+ # Process input with regexp
+
+ fixedlines = []
+ modified = False
+
+ for line in spilines:
+
+ # Fix 1: ngspice does not understand the syntax used for the dev/gauss lines,
+ # so remove them.
+ fixedline = re.sub('dev/gauss[ \t]*=.*$', '', line)
+
+ # Fix 2: Remove references to *_dlc_rotweak
+ # fixedline = re.sub('\+[ \t]*[^ \t_]+_dlc_rotweak', '', fixedline)
+
+ # Fix 2: Remove references to *_[a,p]junction_mult
+ # fixedline = re.sub('\*[ \t]*[^ \t_]+_[ap]junction_mult', '', fixedline)
+
+ fixedlines.append(fixedline)
+ if fixedline != line:
+ modified = True
+
+ # Write output
+ if outname == None:
+ for i in fixedlines:
+ print(i)
+ else:
+ # If the output is a symbolic link but no modifications have been made,
+ # then leave it alone. If it was modified, then remove the symbolic
+ # link before writing.
+ if os.path.islink(outname):
+ if not modified:
+ return 0
+ else:
+ os.unlink(outname)
+ try:
+ with open(outname, 'w') as outFile:
+ for i in fixedlines:
+ print(i, file=outFile)
+ except:
+ print('fixspice.py: failed to open ' + outname + ' for writing.', file=sys.stderr)
+ return 1
+
+
+if __name__ == '__main__':
+
+ # This script expects to get one or two arguments. One argument is
+ # mandatory and is the input file. The other argument is optional and
+ # is the output file. The output file and input file may be the same
+ # name, in which case the original input is overwritten.
+
+ options = []
+ arguments = []
+ for item in sys.argv[1:]:
+ if item.find('-', 0) == 0:
+ options.append(item[1:])
+ else:
+ arguments.append(item)
+
+ if len(arguments) > 0:
+ infilename = arguments[0]
+
+ if len(arguments) > 1:
+ outfilename = arguments[1]
+ else:
+ outfilename = None
+
+ result = filter(infilename, outfilename)
+ sys.exit(result)
