pano_logic_g2.py

#!/usr/bin/env python3

# This file is Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
# License: BSD

import os
import argparse

from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer

from litex_boards.platforms import pano_logic_g2

from litex.soc.cores.clock import *
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *
from litex.soc.cores.led import LedChaser

# CRG ----------------------------------------------------------------------------------------------

class _CRG(Module):
    def __init__(self, platform, clk_freq):
        self.clock_domains.cd_sys    = ClockDomain()

        # # #

        # Take Ethernet PHY out of reset to enable clk125 (25MHz otherwise).
        gmii_rst_n = platform.request("gmii_rst_n")
        self.comb += gmii_rst_n.eq(1)

        self.submodules.pll = pll = S6PLL(speedgrade=-2)
        pll.register_clkin(platform.request("clk125"), 125e6)
        pll.create_clkout(self.cd_sys, clk_freq)

# BaseSoC ------------------------------------------------------------------------------------------

class BaseSoC(SoCCore):
    def __init__(self, revision, sys_clk_freq=int(50e6), **kwargs):
        platform = pano_logic_g2.Platform(revision=revision)

        # SoCCore ----------------------------------------------------------------------------------
        SoCCore.__init__(self, platform, clk_freq=sys_clk_freq, **kwargs)

        # CRG --------------------------------------------------------------------------------------
        self.submodules.crg = _CRG(platform, sys_clk_freq)

        # Leds -------------------------------------------------------------------------------------
        self.submodules.leds = LedChaser(
            pads         = Cat(*[platform.request("user_led", i) for i in range(3)]),
            sys_clk_freq = sys_clk_freq)
        self.add_csr("leds")

# Build --------------------------------------------------------------------------------------------

def main():
    parser = argparse.ArgumentParser(description="LiteX SoC on Pano Logic G2")
    parser.add_argument("--build",    action="store_true", help="Build bitstream")
    parser.add_argument("--load",     action="store_true", help="Load bitstream")
    parser.add_argument("--revision", default="c",         help="Board revision c (default) or b")
    builder_args(parser)
    soc_core_args(parser)
    args = parser.parse_args()

    soc = BaseSoC(revision=args.revision, **soc_core_argdict(args))
    builder = Builder(soc, **builder_argdict(args))
    builder.build(run=args.build)

    if args.load:
        prog = soc.platform.create_programmer()
        prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bit"))

if __name__ == "__main__":
    main()