#!/usr/bin/env python3

#
# This file is part of LiteEth.
#
# Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause

import argparse

from migen import *

from litex.build.generic_platform import *
from litex.build.sim import SimPlatform
from litex.build.sim.config import SimConfig

from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *

from liteeth.phy.model import LiteEthPHYModel

# IOs ----------------------------------------------------------------------------------------------

_io = [
    ("sys_clk", 0, Pins(1)),
    ("sys_rst", 0, Pins(1)),
    ("eth_clocks", 0,
        Subsignal("tx", Pins(1)),
        Subsignal("rx", Pins(1)),
    ),
    ("eth", 0,
        Subsignal("source_valid", Pins(1)),
        Subsignal("source_ready", Pins(1)),
        Subsignal("source_data",  Pins(8)),

        Subsignal("sink_valid",   Pins(1)),
        Subsignal("sink_ready",   Pins(1)),
        Subsignal("sink_data",    Pins(8)),
    ),
]

# Platform -----------------------------------------------------------------------------------------

class Platform(SimPlatform):
    def __init__(self):
        SimPlatform.__init__(self, "SIM", _io)

# Bench SoC ----------------------------------------------------------------------------------------

class BenchSoC(SoCCore):
    def __init__(self, **kwargs):
        platform     = Platform()
        sys_clk_freq = int(1e6)

        # SoCMini ----------------------------------------------------------------------------------
        SoCMini.__init__(self, platform, clk_freq=sys_clk_freq,
            ident          = "LiteEth bench Simulation",
            ident_version  = True
        )

        # CRG --------------------------------------------------------------------------------------
        self.submodules.crg = CRG(platform.request("sys_clk"))

        # Etherbone --------------------------------------------------------------------------------
        self.submodules.ethphy = LiteEthPHYModel(self.platform.request("eth"))
        self.add_csr("ethphy")
        self.add_etherbone(phy=self.ethphy, buffer_depth=255)

        # SRAM -------------------------------------------------------------------------------------
        self.add_ram("sram", 0x20000000, 0x1000)

# Main ---------------------------------------------------------------------------------------------

def main():
    parser = argparse.ArgumentParser(description="LiteEth Bench Simulation")
    args = parser.parse_args()

    sim_config = SimConfig()
    sim_config.add_clocker("sys_clk", freq_hz=1e6)
    sim_config.add_module("ethernet", "eth", args={"interface": "tap0", "ip": "192.168.1.100"})

    soc     = BenchSoC()
    builder = Builder(soc, csr_csv="csr.csv")
    builder.build(sim_config=sim_config)

if __name__ == "__main__":
    main()