#!/usr/bin/env python3

#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2021 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause

# Work-In-Progress...

import os

from migen import *

from litex.gen import *

from litex_boards.platforms import decklink_intensity_pro_4k

from litex.soc.cores.clock import *
from litex.soc.integration.soc import SoCRegion
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *

from litepcie.phy.s7pciephy import S7PCIEPHY
from litepcie.software import generate_litepcie_software

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

class _CRG(LiteXModule):
    def __init__(self, platform, sys_clk_freq):
        self.rst    = Signal()
        self.cd_sys = ClockDomain()

        # # #

        self.pll = pll = S7PLL(speedgrade=-1)
        self.comb += pll.reset.eq(ResetSignal("pcie") | self.rst)
        pll.register_clkin(ClockSignal("pcie"), 125e6)
        pll.create_clkout(self.cd_sys, 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.

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

class BaseSoC(SoCCore):
    def __init__(self, sys_clk_freq=125e6, with_pcie=False, **kwargs):
        platform = decklink_intensity_pro_4k.Platform()

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

        # SoCCore ----------------------------------------------------------------------------------
        kwargs["uart_name"] = "crossover"
        SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Blackmagic Decklink Intensity Pro 4K", **kwargs)

        # PCIe -------------------------------------------------------------------------------------
        if with_pcie:
            self.pcie_phy = S7PCIEPHY(platform, platform.request("pcie_x4"),
                data_width = 128,
                bar0_size  = 0x20000)
            self.add_pcie(phy=self.pcie_phy, ndmas=1)

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

def main():
    from litex.build.parser import LiteXArgumentParser
    parser = LiteXArgumentParser(platform=decklink_intensity_pro_4k.Platform, description="LiteX SoC Blackmagic Decklink Intensity Pro 4K.")
    parser.add_target_argument("--sys-clk-freq", default=125e6, type=float, help="System clock frequency.")
    parser.add_target_argument("--with-pcie",    action="store_true",       help="Enable PCIe support.")
    parser.add_target_argument("--driver",       action="store_true",       help="Generate PCIe driver.")
    args = parser.parse_args()

    soc = BaseSoC(
        sys_clk_freq = args.sys_clk_freq,
        with_pcie    = args.with_pcie | True, # FIXME: Always enable PCIe for now.
        **parser.soc_argdict
    )
    builder = Builder(soc, **parser.builder_argdict)
    if args.build:
        builder.build(**parser.toolchain_argdict)

    if args.driver:
        generate_litepcie_software(soc, os.path.join(builder.output_dir, "driver"))

    if args.load:
        prog = soc.platform.create_programmer()
        prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))

if __name__ == "__main__":
    main()