litex-boards/litex_boards/targets/lambdaconcept_ecpix5.py

#!/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

import os
import argparse
import sys

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

from litex_boards.platforms import ecpix5

from litex.build.lattice.trellis import trellis_args, trellis_argdict

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

from litedram.modules import MT41K256M16
from litedram.phy import ECP5DDRPHY

from liteeth.phy.ecp5rgmii import LiteEthPHYRGMII

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

class _CRG(Module):
    def __init__(self, platform, sys_clk_freq):
        self.rst = Signal()
        self.clock_domains.cd_init    = ClockDomain()
        self.clock_domains.cd_por     = ClockDomain(reset_less=True)
        self.clock_domains.cd_sys     = ClockDomain()
        self.clock_domains.cd_sys2x   = ClockDomain()
        self.clock_domains.cd_sys2x_i = ClockDomain(reset_less=True)

        # # #

        self.stop  = Signal()
        self.reset = Signal()

        # Clk / Rst
        clk100 = platform.request("clk100")
        rst_n  = platform.request("rst_n")

        # Power on reset
        por_count = Signal(16, reset=2**16-1)
        por_done  = Signal()
        self.comb += self.cd_por.clk.eq(clk100)
        self.comb += por_done.eq(por_count == 0)
        self.sync.por += If(~por_done, por_count.eq(por_count - 1))

        # PLL
        self.submodules.pll = pll = ECP5PLL()
        self.comb += pll.reset.eq(~por_done | ~rst_n | self.rst)
        pll.register_clkin(clk100, 100e6)
        pll.create_clkout(self.cd_sys2x_i, 2*sys_clk_freq)
        pll.create_clkout(self.cd_init, 25e6)
        self.specials += [
            Instance("ECLKSYNCB",
                i_ECLKI = self.cd_sys2x_i.clk,
                i_STOP  = self.stop,
                o_ECLKO = self.cd_sys2x.clk),
            Instance("CLKDIVF",
                p_DIV     = "2.0",
                i_ALIGNWD = 0,
                i_CLKI    = self.cd_sys2x.clk,
                i_RST     = self.reset,
                o_CDIVX   = self.cd_sys.clk),
            AsyncResetSynchronizer(self.cd_sys,   ~pll.locked | self.reset | self.rst),
            AsyncResetSynchronizer(self.cd_sys2x, ~pll.locked | self.reset | self.rst),
        ]

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

class BaseSoC(SoCCore):
    def __init__(self, device="85F", sys_clk_freq=int(75e6), with_ethernet=False,
                 with_etherbone=False, with_led_chaser=True, **kwargs):
        platform = ecpix5.Platform(device=device, toolchain="trellis")

        # SoCCore ----------------------------------------------------------------------------------
        SoCCore.__init__(self, platform, sys_clk_freq,
            ident          = "LiteX SoC on ECPIX-5",
            ident_version  = True,
            **kwargs)

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

        # DDR3 SDRAM -------------------------------------------------------------------------------
        if not self.integrated_main_ram_size:
            self.submodules.ddrphy = ECP5DDRPHY(
                platform.request("ddram"),
                sys_clk_freq=sys_clk_freq)
            self.comb += self.crg.stop.eq(self.ddrphy.init.stop)
            self.comb += self.crg.reset.eq(self.ddrphy.init.reset)
            self.add_sdram("sdram",
                phy           = self.ddrphy,
                module        = MT41K256M16(sys_clk_freq, "1:2"),
                l2_cache_size = kwargs.get("l2_size", 8192)
            )

        # Ethernet / Etherbone ---------------------------------------------------------------------
        if with_ethernet or with_etherbone:
            self.submodules.ethphy = LiteEthPHYRGMII(
                clock_pads = self.platform.request("eth_clocks"),
                pads       = self.platform.request("eth"),
                rx_delay   = 0e-9)
            if with_ethernet:
                self.add_ethernet(phy=self.ethphy)
            if with_etherbone:
                self.add_etherbone(phy=self.ethphy)

        # Leds -------------------------------------------------------------------------------------
        if with_led_chaser:
            leds_pads = []
            for i in range(4):
                rgb_led_pads = platform.request("rgb_led", i)
                self.comb += [getattr(rgb_led_pads, n).eq(1) for n in "gb"] # Disable Green/Blue Leds.
                leds_pads += [getattr(rgb_led_pads, n) for n in "r"]
            self.submodules.leds = LedChaser(
                pads         = Cat(leds_pads),
                sys_clk_freq = sys_clk_freq)

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

def main():
    parser = argparse.ArgumentParser(description="LiteX SoC on ECPIX-5")
    parser.add_argument("--build",           action="store_true", help="Build bitstream")
    parser.add_argument("--load",            action="store_true", help="Load bitstream")
    parser.add_argument("--flash",           action="store_true", help="Flash bitstream to SPI Flash")
    parser.add_argument("--device",          default="85F",       help="ECP5 device (default: 85F)")
    parser.add_argument("--sys-clk-freq",    default=75e6,        help="System clock frequency (default: 75MHz)")
    parser.add_argument("--with-sdcard",     action="store_true", help="Enable SDCard support")
    ethopts = parser.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")

    builder_args(parser)
    soc_core_args(parser)
    trellis_args(parser)
    args = parser.parse_args()

    soc = BaseSoC(
        device         = args.device,
        sys_clk_freq   = int(float(args.sys_clk_freq)),
        with_ethernet  = args.with_ethernet,
        with_etherbone = args.with_etherbone,
        **soc_core_argdict(args)
    )
    if args.with_sdcard:
        soc.add_sdcard()
    builder = Builder(soc, **builder_argdict(args))
    builder.build(**trellis_argdict(args), 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 args.flash:
        prog = soc.platform.create_programmer()
        prog.flash(None, os.path.join(builder.gateware_dir, soc.build_name + ".bit"))

if __name__ == "__main__":
    main()