litex-boards/litex_boards/targets/stlv7325.py

#!/usr/bin/env python3

#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2022 Andrew Gillham <gillham@roadsign.com>
# Copyright (c) 2014-2015 Sebastien Bourdeauducq <sb@m-labs.hk>
# Copyright (c) 2014-2020 Florent Kermarrec <florent@enjoy-digital.fr>
# Copyright (c) 2014-2015 Yann Sionneau <ys@m-labs.hk>
# SPDX-License-Identifier: BSD-2-Clause

import os
import argparse

from migen import *

from litex_boards.platforms import stlv7325

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 litex.soc.cores.bitbang import I2CMaster

from litedram.modules import MT8JTF12864
from litedram.phy import s7ddrphy

from liteeth.phy import LiteEthPHY

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_idelay = ClockDomain()

        # # #

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

        # PLL.
        self.submodules.pll = pll = S7MMCM(speedgrade=-2)
        self.comb += pll.reset.eq(~rst_n | 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_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.submodules.idelayctrl = S7IDELAYCTRL(self.cd_idelay)

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

class BaseSoC(SoCCore):
    def __init__(self, sys_clk_freq=int(125e6), with_ethernet=False, with_led_chaser=True,
                 with_pcie=False, with_sata=False, **kwargs):
        platform = stlv7325.Platform()

        # SoCCore ----------------------------------------------------------------------------------
        SoCCore.__init__(self, platform, sys_clk_freq,
            ident = "LiteX SoC on STLV7325",
            **kwargs)

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

        # DDR3 SDRAM -------------------------------------------------------------------------------
        if not self.integrated_main_ram_size:
            self.submodules.ddrphy = s7ddrphy.K7DDRPHY(platform.request("ddram"),
                memtype      = "DDR3",
                nphases      = 4,
                sys_clk_freq = sys_clk_freq,
            )
            self.add_sdram("sdram",
                phy           = self.ddrphy,
                module        = MT8JTF12864(sys_clk_freq, "1:4"),
                l2_cache_size = kwargs.get("l2_size", 8192),
            )

        # Ethernet ---------------------------------------------------------------------------------
        if with_ethernet:
            self.submodules.ethphy = LiteEthPHY(
                clock_pads = self.platform.request("eth_clocks", 0),
                pads       = self.platform.request("eth", 0),
                clk_freq   = self.clk_freq)
            self.add_ethernet(phy=self.ethphy)

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

        # TODO verify / test
        # SATA -------------------------------------------------------------------------------------
        if with_sata:
            from litex.build.generic_platform import Subsignal, Pins
            from litesata.phy import LiteSATAPHY

            # RefClk, Generate 150MHz from PLL.
            self.clock_domains.cd_sata_refclk = ClockDomain()
            self.crg.pll.create_clkout(self.cd_sata_refclk, 150e6)
            sata_refclk = ClockSignal("sata_refclk")
            platform.add_platform_command("set_property SEVERITY {{Warning}} [get_drc_checks REQP-52]")

            # PHY
            self.submodules.sata_phy = LiteSATAPHY(platform.device,
                refclk     = sata_refclk,
                pads       = platform.request("sata", 0),
                gen        = "gen2",
                clk_freq   = sys_clk_freq,
                data_width = 16)

            # Core
            self.add_sata(phy=self.sata_phy, mode="read+write")

        # Leds -------------------------------------------------------------------------------------
        if with_led_chaser:
            self.submodules.leds = LedChaser(
                pads         = platform.request_all("user_led_n"),
                sys_clk_freq = sys_clk_freq)

        # I2C --------------------------------------------------------------------------------------
        self.submodules.i2c = I2CMaster(platform.request("i2c"))

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

def main():
    parser = argparse.ArgumentParser(description="LiteX SoC on STLV7325")
    parser.add_argument("--build",         action="store_true", help="Build bitstream.")
    parser.add_argument("--load",          action="store_true", help="Load bitstream.")
    parser.add_argument("--sys-clk-freq",  default=125e6,       help="System clock frequency.")
    parser.add_argument("--with-ethernet", action="store_true", help="Enable Ethernet support.")
    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-sata",     action="store_true", help="Enable SATA support (over SFP2SATA).")
    builder_args(parser)
    soc_core_args(parser)
    args = parser.parse_args()

    soc = BaseSoC(
        sys_clk_freq  = int(float(args.sys_clk_freq)),
        with_ethernet = args.with_ethernet,
        with_pcie     = args.with_pcie,
        with_sata     = args.with_sata,
        **soc_core_argdict(args)
    )
    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 __name__ == "__main__":
    main()