#!/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

# Build/Use ----------------------------------------------------------------------------------------
# Build/Load bitstream:
# ./acorn_cle_215.py --uart-name=crossover --with-pcie --build --driver --load (or --flash)
#
#.Build the kernel and load it:
# cd build/<platform>/driver/kernel
# make
# sudo ./init.sh
#
# Test userspace utilities:
# cd build/<platform>/driver/user
# make
# ./litepcie_util info
# ./litepcie_util scratch_test
# ./litepcie_util dma_test
# ./litepcie_util uart_test

import os
import argparse
import sys

from migen import *

from litex_boards.platforms import acorn_cle_215

from litex.soc.interconnect.csr import *
from litex.soc.integration.soc_core import *
from litex.soc.integration.soc_sdram import *
from litex.soc.integration.builder import *

from litex.soc.cores.clock import *
from litex.soc.cores.led import LedChaser

from litedram.modules import MT41K512M16
from litedram.phy import s7ddrphy

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

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

class CRG(Module):
    def __init__(self, platform, sys_clk_freq):
        self.rst = Signal()
        self.clock_domains.cd_sys       = ClockDomain()
        self.clock_domains.cd_sys4x     = ClockDomain(reset_less=True)
        self.clock_domains.cd_sys4x_dqs = ClockDomain(reset_less=True)
        self.clock_domains.cd_idelay    = ClockDomain()

        # Clk/Rst
        clk200 = platform.request("clk200")

        # PLL
        self.submodules.pll = pll = S7PLL()
        self.comb += pll.reset.eq(self.rst)
        pll.register_clkin(clk200, 200e6)
        pll.create_clkout(self.cd_sys,       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)

        self.submodules.idelayctrl = S7IDELAYCTRL(self.cd_idelay)

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

class BaseSoC(SoCCore):
    def __init__(self, with_pcie=False, **kwargs):
        platform = acorn_cle_215.Platform()
        sys_clk_freq = int(100e6)

        # SoCCore ----------------------------------------------------------------------------------
        SoCCore.__init__(self, platform, sys_clk_freq,
            ident          = "LiteX SoC on Acorn CLE 215+",
            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 = s7ddrphy.A7DDRPHY(platform.request("ddram"),
                memtype          = "DDR3",
                nphases          = 4,
                sys_clk_freq     = sys_clk_freq,
                iodelay_clk_freq = 200e6)
            self.add_csr("ddrphy")
            self.add_sdram("sdram",
                phy                     = self.ddrphy,
                module                  = MT41K512M16(sys_clk_freq, "1:4"),
                origin                  = self.mem_map["main_ram"],
                size                    = kwargs.get("max_sdram_size", 0x40000000),
                l2_cache_size           = kwargs.get("l2_size", 8192),
                l2_cache_min_data_width = kwargs.get("min_l2_data_width", 128),
                l2_cache_reverse        = True
            )

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

        # Leds -------------------------------------------------------------------------------------
        self.submodules.leds = LedChaser(
            pads         = platform.request_all("user_led"),
            sys_clk_freq = sys_clk_freq)
        self.add_csr("leds")

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

def main():
    parser = argparse.ArgumentParser(description="LiteX SoC on Acorn CLE 215+")
    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")
    parser.add_argument("--with-pcie",       action="store_true", help="Enable PCIe support")
    parser.add_argument("--driver",          action="store_true", help="Generate PCIe driver")
    parser.add_argument("--with-spi-sdcard", action="store_true", help="Enable SPI-mode SDCard support (requires SDCard adapter on P2)")
    builder_args(parser)
    soc_sdram_args(parser)
    args = parser.parse_args()

    soc = BaseSoC(with_pcie     = args.with_pcie, **soc_sdram_argdict(args))
    if args.with_spi_sdcard:
        soc.add_spi_sdcard()

    builder  = Builder(soc, **builder_argdict(args))
    builder.build(run=args.build)

    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(os.path.join(builder.gateware_dir, soc.build_name + ".bit"))

    if args.flash:
        prog = soc.platform.create_programmer()
        prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bin"))

if __name__ == "__main__":
    main()