litex-boards/litex_boards/targets/logicbone.py

#!/usr/bin/env python3

# This file is Copyright (c) 2020 Owen Kirby <oskirby@gmail.com>
# License: BSD

import os
import sys
import argparse

from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer

from litex_boards.platforms import logicbone

from litex.build.lattice.trellis import trellis_args, trellis_argdict

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

from litedram.modules import MT41K512M16
from litedram.phy import ECP5DDRPHY
from liteeth.phy.ecp5rgmii import LiteEthPHYRGMII

# _CRG ---------------------------------------------------------------------------------------------

class _CRG(Module):
    def __init__(self, platform, sys_clk_freq, with_usb_pll=False):
        self.clock_domains.cd_init     = ClockDomain()
        self.clock_domains.cd_por      = ClockDomain(reset_less=True)
        self.clock_domains.cd_sys      = ClockDomain()
        self.clock_domains.cd_sys2x    = ClockDomain()
        self.clock_domains.cd_sys2x_i  = ClockDomain(reset_less=True)

        # # #

        self.stop = Signal()
        self.reset = Signal()

        # Clk / Rst
        clk25 = platform.request("refclk")

        # Power on reset
        por_count = Signal(16, reset=2**16-1)
        por_done  = Signal()
        self.comb += self.cd_por.clk.eq(clk25)
        self.comb += por_done.eq(por_count == 0)
        self.sync.por += If(~por_done, por_count.eq(por_count - 1))

        # PLL
        sys2x_clk_ecsout = Signal()
        self.submodules.pll = pll = ECP5PLL()
        pll.register_clkin(clk25, 25e6)
        pll.create_clkout(self.cd_sys2x_i, 2*sys_clk_freq)
        pll.create_clkout(self.cd_init, 24e6)
        self.specials += [
            Instance("ECLKBRIDGECS",
                i_CLK0   = self.cd_sys2x_i.clk,
                i_SEL    = 0,
                o_ECSOUT = sys2x_clk_ecsout),
            Instance("ECLKSYNCB",
                i_ECLKI = sys2x_clk_ecsout,
                i_STOP  = self.stop,
                o_ECLKO = self.cd_sys2x.clk),
            Instance("CLKDIVF",
                p_DIV     = "2.0",
                i_ALIGNWD = 0,
                i_CLKI    = self.cd_sys2x.clk,
                i_RST     = self.reset,
                o_CDIVX   = self.cd_sys.clk),
            AsyncResetSynchronizer(self.cd_init,   ~por_done | ~pll.locked),
            AsyncResetSynchronizer(self.cd_sys,    ~por_done | ~pll.locked | self.reset),
            AsyncResetSynchronizer(self.cd_sys2x,  ~por_done | ~pll.locked | self.reset),
        ]

        # USB PLL
        if with_usb_pll:
            self.clock_domains.cd_usb_12 = ClockDomain()
            self.clock_domains.cd_usb_48 = ClockDomain()
            usb_pll = ECP5PLL()
            self.submodules += usb_pll
            usb_pll.register_clkin(clk25, 25e6)
            usb_pll.create_clkout(self.cd_usb_48, 48e6)
            usb_pll.create_clkout(self.cd_usb_12, 12e6)

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

class BaseSoC(SoCCore):
    def __init__(self, revision="rev0", device="45F", sdram_device="MT41K512M16",
                 with_ethernet=False,
                 sys_clk_freq=int(75e6), toolchain="trellis", **kwargs):
        platform = logicbone.Platform(revision=revision, device=device ,toolchain=toolchain)

        # Serial -----------------------------------------------------------------------------------
        if kwargs["uart_name"] == "usb_acm":
            # FIXME: do proper install of ValentyUSB.
            os.system("git clone https://github.com/gregdavill/valentyusb -b hw_cdc_eptri")
            sys.path.append("valentyusb")

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

        # CRG --------------------------------------------------------------------------------------
        with_usb_pll = kwargs.get("uart_name", None) == "usb_acm"
        self.submodules.crg = _CRG(platform, sys_clk_freq, with_usb_pll)

        # DDR3 SDRAM -------------------------------------------------------------------------------
        if not self.integrated_main_ram_size:
            available_sdram_modules = {
                "MT41K512M16":  MT41K512M16,
                #"AS4C1GM8":    AS4C1GM8, ## Too many rows, seems to break things.
            }
            sdram_module = available_sdram_modules.get(sdram_device)

            self.submodules.ddrphy = ECP5DDRPHY(
                platform.request("ddram"),
                sys_clk_freq=sys_clk_freq)
            self.add_csr("ddrphy")
            self.comb += self.crg.stop.eq(self.ddrphy.init.stop)
            self.comb += self.crg.reset.eq(self.ddrphy.init.reset)
            self.add_sdram("sdram",
                phy                     = self.ddrphy,
                module                  = sdram_module(sys_clk_freq, "1:2"),
                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
            )

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


        # Leds -------------------------------------------------------------------------------------
        self.submodules.leds = LedChaser(
            pads         = Cat(*[platform.request("user_led", i) for i in range(4)]),
            sys_clk_freq = sys_clk_freq)
        self.add_csr("leds")

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

def main():
    parser = argparse.ArgumentParser(description="LiteX SoC on Logicbone")
    parser.add_argument("--build", action="store_true", help="Build bitstream")
    parser.add_argument("--load",  action="store_true", help="Load bitstream")
    parser.add_argument("--toolchain", default="trellis", help="Gateware toolchain to use, trellis (default) or diamond")
    builder_args(parser)
    soc_sdram_args(parser)
    trellis_args(parser)
    parser.add_argument("--sys-clk-freq",   default=75e6,           help="System clock frequency (default=75MHz)")
    parser.add_argument("--device",         default="45F",          help="ECP5 device (default=45F)")
    parser.add_argument("--sdram-device",   default="MT41K512M16",  help="ECP5 device (default=MT41K512M16)")
    parser.add_argument("--with-ethernet",  action="store_true",    help="enable Ethernet support")
    parser.add_argument("--with-sdcard",    action="store_true",    help="enable SDCard support")
    args = parser.parse_args()

    soc = BaseSoC(
        toolchain     = args.toolchain,
        device        = args.device,
        sdram_device  = args.sdram_device,
        with_ethernet = args.with_ethernet,
        sys_clk_freq  = int(float(args.sys_clk_freq)),
        **soc_sdram_argdict(args))
    if args.with_sdcard:
        soc.add_sdcard()
    builder = Builder(soc, **builder_argdict(args))
    builder_kargs = trellis_argdict(args) if args.toolchain == "trellis" else {}
    builder.build(**builder_kargs, run=args.build)

    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()