litex-boards/litex_boards/targets/gsd_orangecrab.py

#!/usr/bin/env python3

#
# This file is part of LiteX-Boards.
#
# Copyright (c) Greg Davill <greg.davill@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause

import os
import sys

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

from litex.gen import LiteXModule

from litex_boards.platforms import gsd_orangecrab

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 MT41K64M16, MT41K128M16, MT41K256M16, MT41K512M16
from litedram.phy import ECP5DDRPHY

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

class _CRG(LiteXModule):
    def __init__(self, platform, sys_clk_freq, with_usb_pll=False):
        self.rst    = Signal()
        self.cd_por = ClockDomain()
        self.cd_sys = ClockDomain()

        # # #

        # Clk / Rst
        clk48 = platform.request("clk48")
        rst_n = platform.request("usr_btn", loose=True)
        if rst_n is None: rst_n = 1

        # Power on reset
        por_count = Signal(16, reset=2**16-1)
        por_done  = Signal()
        self.comb += self.cd_por.clk.eq(clk48)
        self.comb += por_done.eq(por_count == 0)
        self.sync.por += If(~por_done, por_count.eq(por_count - 1))

        # PLL
        self.pll = pll = ECP5PLL()
        self.comb += pll.reset.eq(~por_done | ~rst_n | self.rst)
        pll.register_clkin(clk48, 48e6)
        pll.create_clkout(self.cd_sys, sys_clk_freq)

        # USB PLL
        if with_usb_pll:
            self.cd_usb_12 = ClockDomain()
            self.cd_usb_48 = ClockDomain()
            usb_pll = ECP5PLL()
            self.submodules += usb_pll
            self.comb += usb_pll.reset.eq(~por_done)
            usb_pll.register_clkin(clk48, 48e6)
            usb_pll.create_clkout(self.cd_usb_48, 48e6)
            usb_pll.create_clkout(self.cd_usb_12, 12e6)

        # FPGA Reset (press usr_btn for 1 second to fallback to bootloader)
        reset_timer = WaitTimer(int(48e6))
        reset_timer = ClockDomainsRenamer("por")(reset_timer)
        self.submodules += reset_timer
        self.comb += reset_timer.wait.eq(~rst_n)
        self.comb += platform.request("rst_n").eq(~reset_timer.done)


class _CRGSDRAM(LiteXModule):
    def __init__(self, platform, sys_clk_freq, with_usb_pll=False):
        self.rst = Signal()
        self.cd_init     = ClockDomain()
        self.cd_por      = ClockDomain()
        self.cd_sys      = ClockDomain()
        self.cd_sys2x    = ClockDomain()
        self.cd_sys2x_i  = ClockDomain()

        # # #

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

        # Clk / Rst
        clk48 = platform.request("clk48")
        rst_n = platform.request("usr_btn", loose=True)
        if rst_n is None: rst_n = 1

        # Power on reset
        por_count = Signal(16, reset=2**16-1)
        por_done  = Signal()
        self.comb += self.cd_por.clk.eq(clk48)
        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.pll = pll = ECP5PLL()
        self.comb += pll.reset.eq(~por_done | ~rst_n | self.rst)
        pll.register_clkin(clk48, 48e6)
        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_sys, ~pll.locked | self.reset),
        ]

        # USB PLL
        if with_usb_pll:
            self.cd_usb_12 = ClockDomain()
            self.cd_usb_48 = ClockDomain()
            usb_pll = ECP5PLL()
            self.submodules += usb_pll
            self.comb += usb_pll.reset.eq(~por_done)
            usb_pll.register_clkin(clk48, 48e6)
            usb_pll.create_clkout(self.cd_usb_48, 48e6)
            usb_pll.create_clkout(self.cd_usb_12, 12e6)

        # FPGA Reset (press usr_btn for 1 second to fallback to bootloader)
        reset_timer = WaitTimer(int(48e6))
        reset_timer = ClockDomainsRenamer("por")(reset_timer)
        self.submodules += reset_timer
        self.comb += reset_timer.wait.eq(~rst_n)
        self.comb += platform.request("rst_n").eq(~reset_timer.done)

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

class BaseSoC(SoCCore):
    def __init__(self, revision="0.2", device="25F", sdram_device="MT41K64M16",
                 sys_clk_freq=int(48e6), toolchain="trellis", with_led_chaser=True, **kwargs):
        platform = gsd_orangecrab.Platform(revision=revision, device=device ,toolchain=toolchain)

        # CRG --------------------------------------------------------------------------------------
        crg_cls      = _CRGSDRAM if kwargs.get("integrated_main_ram_size", 0) == 0 else _CRG
        self.crg = crg_cls(platform, sys_clk_freq, with_usb_pll=True)

        # SoCCore ----------------------------------------------------------------------------------
        # Defaults to USB ACM through ValentyUSB.
        kwargs["uart_name"] = "usb_acm"
        SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on OrangeCrab", **kwargs)

        # DDR3 SDRAM -------------------------------------------------------------------------------
        if not self.integrated_main_ram_size:
            available_sdram_modules = {
                "MT41K64M16":  MT41K64M16,
                "MT41K128M16": MT41K128M16,
                "MT41K256M16": MT41K256M16,
                "MT41K512M16": MT41K512M16,
            }
            sdram_module = available_sdram_modules.get(sdram_device)

            ddram_pads = platform.request("ddram")
            self.ddrphy = ECP5DDRPHY(
                pads         = ddram_pads,
                sys_clk_freq = sys_clk_freq,
                dm_remapping = {0:1, 1:0},
                cmd_delay    = 0 if sys_clk_freq > 64e6 else 100)
            self.ddrphy.settings.rtt_nom = "disabled"
            if hasattr(ddram_pads, "vccio"):
                self.comb += ddram_pads.vccio.eq(0b111111)
            if hasattr(ddram_pads, "gnd"):
                self.comb += ddram_pads.gnd.eq(0)
            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"),
                l2_cache_size = kwargs.get("l2_size", 8192)
            )

        # 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=gsd_orangecrab.Platform, description="LiteX SoC on OrangeCrab")
    parser.add_target_argument("--sys-clk-freq",    default=48e6,         help="System clock frequency.")
    parser.add_target_argument("--revision",        default="0.2",        help="Board Revision (0.1 or 0.2).")
    parser.add_target_argument("--device",          default="25F",        help="ECP5 device (25F, 45F or 85F).")
    parser.add_target_argument("--sdram-device",    default="MT41K64M16", help="SDRAM device (MT41K64M16, MT41K128M16, MT41K256M16 or MT41K512M16).")
    parser.add_target_argument("--with-spi-sdcard", action="store_true",  help="Enable SPI-mode SDCard support.")
    args = parser.parse_args()

    soc = BaseSoC(
        toolchain    = args.toolchain,
        revision     = args.revision,
        device       = args.device,
        sdram_device = args.sdram_device,
        sys_clk_freq = int(float(args.sys_clk_freq)),
        **parser.soc_argdict)
    if args.with_spi_sdcard:
        soc.add_spi_sdcard()
    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()