Add Yosys/nextpnr-nexus/oxide flow for CrossLink-NX
Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah
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#
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# This file is part of LiteX.
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#
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# Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
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# Copyright (c) 2019-2020 David Shah <dave@ds0.me>
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# Copyright (c) 2018 William D. Jones <thor0505@comcast.net>
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# SPDX-License-Identifier: BSD-2-Clause
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import os
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import subprocess
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import sys
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from shutil import which
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from migen.fhdl.structure import _Fragment
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from litex.build.generic_platform import *
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from litex.build import tools
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from litex.build.lattice import common
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from litex.build.lattice.radiant import _format_constraint, _format_ldc, _build_pdc
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import math
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# Yosys/Nextpnr Helpers/Templates ------------------------------------------------------------------
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_yosys_template = [
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"verilog_defaults -push",
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"verilog_defaults -add -defer",
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"{read_files}",
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"verilog_defaults -pop",
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"attrmap -tocase keep -imap keep=\"true\" keep=1 -imap keep=\"false\" keep=0 -remove keep=0",
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"synth_nexus -flatten {nwl} {abc} -json {build_name}.json -top {build_name}",
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]
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def _yosys_import_sources(platform):
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includes = ""
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reads = []
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for path in platform.verilog_include_paths:
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includes += " -I" + path
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for filename, language, library in platform.sources:
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reads.append("read_{}{} {}".format(
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language, includes, filename))
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return "\n".join(reads)
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def _build_yosys(template, platform, nowidelut, abc9, build_name):
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ys = []
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for l in template:
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ys.append(l.format(
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build_name = build_name,
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nwl = "-nowidelut" if nowidelut else "",
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abc = "-abc9" if abc9 else "",
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read_files = _yosys_import_sources(platform)
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))
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tools.write_to_file(build_name + ".ys", "\n".join(ys))
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# Script -------------------------------------------------------------------------------------------
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_build_template = [
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"yosys -l {build_name}.rpt {build_name}.ys",
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"nextpnr-nexus --json {build_name}.json --pdc {build_name}.pdc --fasm {build_name}.fasm \
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--device {device} {timefailarg} {ignoreloops} --seed {seed}",
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"prjoxide pack {build_name}.fasm {build_name}.bit"
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]
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def _build_script(source, build_template, build_name, device, timingstrict, ignoreloops, seed):
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if sys.platform in ("win32", "cygwin"):
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script_ext = ".bat"
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script_contents = "@echo off\nrem Autogenerated by LiteX / git: " + tools.get_litex_git_revision() + "\n\n"
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fail_stmt = " || exit /b"
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else:
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script_ext = ".sh"
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script_contents = "# Autogenerated by LiteX / git: " + tools.get_litex_git_revision() + "\nset -e\n"
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fail_stmt = ""
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for s in build_template:
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s_fail = s + "{fail_stmt}\n" # Required so Windows scripts fail early.
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script_contents += s_fail.format(
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build_name = build_name,
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device = device,
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timefailarg = "--timing-allow-fail" if not timingstrict else "",
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ignoreloops = "--ignore-loops" if ignoreloops else "",
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fail_stmt = fail_stmt,
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seed = seed,
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)
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script_file = "build_" + build_name + script_ext
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tools.write_to_file(script_file, script_contents, force_unix=False)
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return script_file
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def _run_script(script):
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if sys.platform in ("win32", "cygwin"):
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shell = ["cmd", "/c"]
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else:
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shell = ["bash"]
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if which("yosys") is None or which("nextpnr-nexus") is None:
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msg = "Unable to find Yosys/Nextpnr toolchain, please:\n"
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msg += "- Add Yosys/Nextpnr toolchain to your $PATH."
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raise OSError(msg)
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if subprocess.call(shell + [script]) != 0:
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raise OSError("Error occured during Yosys/Nextpnr's script execution.")
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# LatticeOxideToolchain --------------------------------------------------------------------------
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class LatticeOxideToolchain:
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attr_translate = {
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# FIXME: document
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"keep": ("keep", "true"),
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"no_retiming": None,
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"async_reg": None,
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"mr_ff": None,
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"mr_false_path": None,
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"ars_ff1": None,
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"ars_ff2": None,
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"ars_false_path": None,
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"no_shreg_extract": None
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}
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special_overrides = common.lattice_NX_special_overrides
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def __init__(self):
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self.yosys_template = _yosys_template
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self.build_template = _build_template
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self.clocks = {}
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self.false_paths = set() # FIXME: use it
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def build(self, platform, fragment,
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build_dir = "build",
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build_name = "top",
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run = True,
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nowidelut = False,
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abc9 = False,
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timingstrict = False,
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ignoreloops = False,
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seed = 1,
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es_device = False,
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**kwargs):
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# Create build directory
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os.makedirs(build_dir, exist_ok=True)
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cwd = os.getcwd()
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os.chdir(build_dir)
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# Finalize design
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if not isinstance(fragment, _Fragment):
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fragment = fragment.get_fragment()
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platform.finalize(fragment)
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# Generate verilog
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v_output = platform.get_verilog(fragment, name=build_name, **kwargs)
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named_sc, named_pc = platform.resolve_signals(v_output.ns)
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top_file = build_name + ".v"
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v_output.write(top_file)
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platform.add_source(top_file)
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# Generate design constraints file (.pdc)
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_build_pdc(named_sc, named_pc, self.clocks, v_output.ns, build_name)
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# Generate Yosys script
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_build_yosys(self.yosys_template, platform, nowidelut, abc9, build_name)
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# N.B. Radiant does not allow a choice between ES1/production, this is determined
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# solely by the installed Radiant version. nextpnr/oxide supports both, so we
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# must choose what we are dealing with
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device = platform.device
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if es_device:
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device += "ES"
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# Generate build script
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script = _build_script(False, self.build_template, build_name, device,
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timingstrict, ignoreloops, seed)
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# Run
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if run:
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_run_script(script)
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os.chdir(cwd)
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return v_output.ns
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# N.B. these are currently ignored, but will be supported very soon
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def add_period_constraint(self, platform, clk, period):
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clk.attr.add("keep")
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period = math.floor(period*1e3)/1e3 # round to lowest picosecond
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if clk in self.clocks:
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if period != self.clocks[clk]:
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raise ValueError("Clock already constrained to {:.2f}ns, new constraint to {:.2f}ns"
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.format(self.clocks[clk], period))
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self.clocks[clk] = period
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def add_false_path_constraint(self, platform, from_, to):
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from_.attr.add("keep")
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to.attr.add("keep")
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if (to, from_) not in self.false_paths:
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self.false_paths.add((from_, to))
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def oxide_args(parser):
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parser.add_argument("--yosys-nowidelut", action="store_true",
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help="pass '-nowidelut' to yosys synth_nexus")
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parser.add_argument("--yosys-abc9", action="store_true",
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help="pass '-abc9' to yosys synth_nexus")
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parser.add_argument("--nextpnr-timingstrict", action="store_true",
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help="fail if timing not met, i.e., do NOT pass '--timing-allow-fail' to nextpnr")
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parser.add_argument("--nextpnr-ignoreloops", action="store_true",
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help="ignore combinational loops in timing analysis, i.e. pass '--ignore-loops' to nextpnr")
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parser.add_argument("--nextpnr-seed", default=1, type=int,
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help="seed to pass to nextpnr")
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parser.add_argument("--nexus-es-device", action="store_true",
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help="device is a ES1 Nexus part")
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def oxide_argdict(args):
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return {
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"nowidelut": args.yosys_nowidelut,
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"abc9": args.yosys_abc9,
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"timingstrict": args.nextpnr_timingstrict,
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"ignoreloops": args.nextpnr_ignoreloops,
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"seed": args.nextpnr_seed,
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"es_device": args.nexus_es_device,
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}
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@ -6,7 +6,7 @@
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# SPDX-License-Identifier: BSD-2-Clause
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from litex.build.generic_platform import GenericPlatform
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from litex.build.lattice import common, diamond, icestorm, trellis, radiant
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from litex.build.lattice import common, diamond, icestorm, trellis, radiant, oxide
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# LatticePlatform ----------------------------------------------------------------------------------
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@ -24,6 +24,8 @@ class LatticePlatform(GenericPlatform):
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self.toolchain = icestorm.LatticeIceStormToolchain()
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elif toolchain == "radiant":
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self.toolchain = radiant.LatticeRadiantToolchain()
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elif toolchain == "oxide":
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self.toolchain = oxide.LatticeOxideToolchain()
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else:
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raise ValueError("Unknown toolchain")
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