litex-boards/litex_boards/targets/pano_logic_g2.py

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#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
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import os
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from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex.gen import LiteXModule
from litex_boards.platforms import pano_logic_g2
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from litex.soc.cores.clock import *
from litex.soc.integration.soc_core import *
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from litex.soc.integration.builder import *
from litex.soc.cores.led import LedChaser
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from liteeth.phy import LiteEthPHY
# CRG ----------------------------------------------------------------------------------------------
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class _CRG(LiteXModule):
def __init__(self, platform, clk_freq, with_ethernet=False):
self.rst = Signal()
self.cd_sys = ClockDomain()
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# # #
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if not with_ethernet:
# Take Ethernet PHY out of reset to enable 125MHz on clk125 (25MHz otherwise).
# See https://github.com/tomverbeure/panologic-g2#fpga-external-clocking-architecture
self.comb += platform.request("eth_rst_n").eq(1)
self.pll = pll = S6PLL(speedgrade=-2)
self.comb += pll.reset.eq(~platform.request("user_btn_n") | self.rst)
pll.register_clkin(platform.request("clk125"), 125e6)
pll.create_clkout(self.cd_sys, clk_freq)
platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst.
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# BaseSoC ------------------------------------------------------------------------------------------
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class BaseSoC(SoCCore):
def __init__(self, revision, sys_clk_freq=int(50e6), with_ethernet=False, with_etherbone=False,
eth_ip="192.168.1.50", with_led_chaser=True, **kwargs):
platform = pano_logic_g2.Platform(revision=revision)
if with_etherbone:
sys_clk_freq = int(125e6)
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# CRG --------------------------------------------------------------------------------------
with_ethernet = (with_ethernet or with_etherbone)
self.crg = _CRG(platform, sys_clk_freq, with_ethernet=with_ethernet)
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Pano Logic G2", **kwargs)
# Ethernet / Etherbone ---------------------------------------------------------------------
if with_ethernet or with_etherbone:
self.ethphy = LiteEthPHY(
clock_pads = self.platform.request("eth_clocks"),
pads = self.platform.request("eth"),
clk_freq = sys_clk_freq,
with_hw_init_reset = False)
if with_ethernet:
self.add_ethernet(phy=self.ethphy)
if with_etherbone:
self.add_etherbone(phy=self.ethphy, ip_address=eth_ip)
# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
self.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
# Build --------------------------------------------------------------------------------------------
def main():
from litex.build.parser import LiteXArgumentParser
parser = LiteXArgumentParser(platform=pano_logic_g2.Platform, description="LiteX SoC on Pano Logic G2")
parser.add_target_argument("--revision", default="c", help="Board revision (b or c).")
parser.add_target_argument("--sys-clk-freq", default=50e6, help="System clock frequency.")
ethopts = parser.target_group.add_mutually_exclusive_group()
ethopts.add_argument("--with-ethernet", action="store_true", help="Enable Ethernet support.")
ethopts.add_argument("--with-etherbone", action="store_true", help="Enable Etherbone support.")
parser.add_target_argument("--eth-ip", default="192.168.1.50", type=str, help="Ethernet/Etherbone IP address.")
args = parser.parse_args()
soc = BaseSoC(
revision = args.revision,
sys_clk_freq = int(float(args.sys_clk_freq)),
with_ethernet = args.with_ethernet,
with_etherbone = args.with_etherbone,
eth_ip = args.eth_ip,
**parser.soc_core_argdict
)
builder = Builder(soc, **parser.builder_argdict)
if args.build:
builder.build(**parser.toolchain_argdict)
if args.load:
prog = soc.platform.create_programmer()
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))
if __name__ == "__main__":
main()