Add a script to post process the Microwatt verilog for caravel

To produce verilog suitable for caravel:

make DOCKER=1 FPGA_TARGET=caravel microwatt_asic.v
./caravel/process-microwatt-verilog.sh

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>

caravel/insert_power.py

@@ -0,0 +1,72 @@
+#!/usr/bin/python
+
+import argparse
+import re
+
+module_regex = r'[a-zA-Z0-9_:\.\\]+'
+
+# match:
+# module dcache(clk, rst, d_in, m_in, wishbone_in, d_out, m_out, stall_out, wishbone_out);
+# A bit of a hack - ignore anything contining a '`', and assume that means we've already
+# processed this module in a previous run. This helps when having to run this script
+# multiple times for different power names.
+multiline_module_re = re.compile(r'module\s+(' + module_regex + r')\(([^`]*?)\);', re.DOTALL)
+module_re = re.compile(r'module\s+(' + module_regex + r')\((.*?)\);')
+
+# match:
+# dcache_64_2_2_2_2_12_0 dcache_0 (
+hookup_re = re.compile(r'\s+(' + module_regex + r') ' + module_regex + r'\s+\(')
+
+header1 = """\
+`ifdef USE_POWER_PINS
+  {power}, {ground},
+`endif\
+"""
+
+header2 = """\
+`ifdef USE_POWER_PINS
+  inout {power};
+  inout {ground};
+`endif\
+"""
+
+header3 = """\
+`ifdef USE_POWER_PINS
+    .{power}({parent_power}),
+    .{ground}({parent_ground}),
+`endif\
+"""
+
+parser = argparse.ArgumentParser(description='Insert power and ground into verilog modules')
+parser.add_argument('--power', default='VPWR', help='POWER net name (default VPWR)')
+parser.add_argument('--ground', default='VGND', help='POWER net name (default VGND)')
+parser.add_argument('--parent-power', default='VPWR', help='POWER net name of parent module (default VPWR)')
+parser.add_argument('--parent-ground', default='VGND', help='POWER net name of parent module (default VGND)')
+parser.add_argument('--verilog', required=True, help='Verilog file to modify')
+parser.add_argument('--module', required=True, action='append', help='Module to replace (can be specified multiple times')
+
+args = parser.parse_args()
+
+with open(args.verilog, 'r') as f:
+    d = f.read()
+    # Remove newlines from module definitions, yosys started doing this as of
+    # commit ff8e999a7112 ("Split module ports, 20 per line")
+    fixed = multiline_module_re.sub(lambda m: m.group(0).replace("\n", ""), d)
+
+    for line in fixed.splitlines():
+        m = module_re.match(line)
+        m2 = hookup_re.match(line)
+        if m and m.group(1) in args.module:
+            module_name = m.group(1)
+            module_args = m.group(2)
+            print('module %s(' % (module_name))
+            print("")
+            print(header1.format(power=args.power, ground=args.ground))
+            print('  %s);' % module_args)
+            print(header2.format(power=args.power, ground=args.ground))
+        elif m2 and m2.group(1) in args.module:
+            print(line)
+            print(header3.format(parent_power=args.parent_power, parent_ground=args.parent_ground, power=args.power, ground=args.ground))
+        else:
+            print(line)
+

caravel/process-microwatt-verilog.sh

@@ -0,0 +1,37 @@
+#!/bin/bash -e
+
+# process microwatt verilog
+
+FILE_IN=microwatt_asic.v
+FILE_OUT=microwatt_asic_processed.v
+
+# Rename top level
+sed 's/toplevel/microwatt/' < $FILE_IN > $FILE_OUT
+
+# Add power to all macros, and route power in microwatt down to them
+caravel/insert_power.py --verilog=$FILE_OUT --parent-power=vccd1 --parent-ground=vssd1 --power=vccd1 --ground=vssd1 --module=microwatt --module=core_0_4_1_4_4_1_2_2_452bf2882a9b5f1c06340d5059c72dbd8af3bf8b --module=execute1_0_47ec8d98366433dc002e7721c9e37d5067547937 --module=multiply_4 --module=soc_4096_100000000_0_0_4_0_4_0_4_1_4_4_1_2_2_32_529beb193518cdd5546a21170d32ebafc9f9cb89 --module=icache_64_8_4_1_4_12_0_5ba93c9db0cff93f52b521d7420e43f6eda2784f --module=dcache_64_4_1_2_2_12_0 --module=cache_ram_5_64_1489f923c4dca729178b3e3233458550d8dddf29 --module=main_bram_64_9_4096_a75adb9e07879fb6c63b494abe06e3f9a6bb2ed9 --module=register_file_0_3f29546453678b855931c174a97d6c0894b8f546 --module=wishbone_bram_wrapper_4096_a75adb9e07879fb6c63b494abe06e3f9a6bb2ed9 --module=fpu > ${FILE_OUT}.tmp1
+
+# Hard macros use VPWR/VGND
+caravel/insert_power.py --verilog=${FILE_OUT}.tmp1 --parent-power=vccd1 --parent-ground=vssd1 --power=VPWR --ground=VGND --module=Microwatt_FP_DFFRFile --module=multiply_add_64x64 --module=RAM32_1RW1R --module=RAM512 > ${FILE_OUT}.tmp2
+
+mv ${FILE_OUT}.tmp2 ${FILE_OUT}
+rm ${FILE_OUT}.tmp1
+
+# Add defines
+sed -i '1 a\
+\
+/* JTAG */\
+`include "tap_top.v"\
+\
+/* UART */\
+`include "raminfr.v"\
+`include "uart_receiver.v"\
+`include "uart_rfifo.v"\
+`include "uart_tfifo.v"\
+`include "uart_transmitter.v"\
+`include "uart_defines.v"\
+`include "uart_regs.v"\
+`include "uart_sync_flops.v"\
+`include "uart_wb.v"\
+`include "uart_top.v"\
+`include "simplebus_host.v"' $FILE_OUT