#!/usr/bin/env python3

#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2015-2019 Florent Kermarrec <florent@enjoy-digital.fr>,
# Copyright (c) 2020 Staf Verhaegen <staf@fibraservi.eu>
# SPDX-License-Identifier: BSD-2-Clause

from migen import *

from litex.gen import LiteXModule

from litex_boards.platforms import digilent_arty_s7

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 MT41K128M16
from litedram.phy import s7ddrphy

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

class _CRG(LiteXModule):
    def __init__(self, platform, sys_clk_freq):
        self.rst          = Signal()
        self.cd_sys       = ClockDomain()
        self.cd_sys2x     = ClockDomain()
        self.cd_sys4x     = ClockDomain()
        self.cd_sys4x_dqs = ClockDomain()
        self.cd_idelay    = 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)
        pll.create_clkout(self.cd_sys2x,     2*sys_clk_freq)
        pll.create_clkout(self.cd_sys4x,     4*sys_clk_freq)
        pll.create_clkout(self.cd_sys4x_dqs, 4*sys_clk_freq, phase=90)
        pll.create_clkout(self.cd_idelay,    200e6)
        platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst.

        self.idelayctrl = S7IDELAYCTRL(self.cd_idelay)

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

class BaseSoC(SoCCore):
    def __init__(self, variant="s7-50", sys_clk_freq=int(100e6), with_spi_flash=False, with_led_chaser=True, **kwargs):
        platform = digilent_arty_s7.Platform(variant=variant)

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

        # SoCCore ----------------------------------------------------------------------------------
        SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Arty S7", **kwargs)

        # DDR3 SDRAM -------------------------------------------------------------------------------
        if not self.integrated_main_ram_size:
            self.ddrphy = s7ddrphy.A7DDRPHY(platform.request("ddram"),
                memtype        = "DDR3",
                nphases        = 4,
                sys_clk_freq   = sys_clk_freq)
            self.add_sdram("sdram",
                phy           = self.ddrphy,
                module        = MT41K128M16(sys_clk_freq, "1:4"),
                l2_cache_size = kwargs.get("l2_size", 8192)
            )

        # SPI Flash --------------------------------------------------------------------------------
        if with_spi_flash:
            from litespi.modules import S25FL128S
            from litespi.opcodes import SpiNorFlashOpCodes as Codes
            self.add_spi_flash(mode="4x", module=S25FL128S(Codes.READ_1_1_4), with_master=True)

        # 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=digilent_arty_s7.Platform, description="LiteX SoC on Arty S7")
    parser.add_target_argument("--variant",        default="s7-50",     help="Board variant (s7-50 or s7-25).")
    parser.add_target_argument("--sys-clk-freq",   default=100e6,       help="System clock frequency.")
    parser.add_target_argument("--with-spi-flash", action="store_true", help="Enable SPI Flash (MMAPed).")
    args = parser.parse_args()

    soc = BaseSoC(
        variant        = args.variant,
        sys_clk_freq   = int(float(args.sys_clk_freq)),
        with_spi_flash = args.with_spi_flash,
        **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 __name__ == "__main__":
    main()