#!/usr/bin/env python3

#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2021 Shinken Sanada <sanadashinken@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause

from migen import *

from litex.gen import *

from litex_boards.platforms import trenz_te0725

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 litex.soc.cores.led import LedChaser

from litex.soc.cores.hyperbus import HyperRAM

# 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(~platform.request("cpu_reset") | self.rst)
        pll.register_clkin(platform.request("clk100"), 100e6)
        pll.create_clkout(self.cd_sys,       sys_clk_freq)

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

class BaseSoC(SoCCore):
    def __init__(self, sys_clk_freq=100e6, with_led_chaser=True, **kwargs):
        platform = trenz_te0725.Platform()

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

        # SoCCore ----------------------------------------------------------------------------------
        SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Trenz TE0725 Board", **kwargs)

        # Use HyperRAM generic PHY as SRAM ---------------------------------------------------------
        size = int((64 * MEGABYTE) / 8)
        hr_pads = platform.request("hyperram", 0)
        self.hyperram = HyperRAM(hr_pads, sys_clk_freq=sys_clk_freq)
        self.bus.add_slave("hyperram", slave=self.hyperram.bus, region=SoCRegion(origin=0x20000000, size=size, mode="rwx"))

        # 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=trenz_te0725.Platform, description="LiteX SoC on Trenz TE0725.")
    parser.add_target_argument("--flash",        action="store_true",       help="Flash bitstream.")
    parser.add_target_argument("--sys-clk-freq", default=100e6, type=float, help="System clock frequency.")

    args = parser.parse_args()

    soc = BaseSoC(
        sys_clk_freq = args.sys_clk_freq,
        **parser.soc_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 args.flash:
        prog = soc.platform.create_programmer()
        prog.load_bitstream(builder.get_bitstream_filename(mode="flash"))

if __name__ == "__main__":
    main()