#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2020 Owen Kirby # SPDX-License-Identifier: BSD-2-Clause import os import sys 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.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.rst = Signal() 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(reset_less=True) self.clock_domains.cd_sys2x_i = ClockDomain(reset_less=True) # # # self.stop = Signal() self.reset = Signal() # Clk / Rst clk25 = platform.request("clk25") # 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() self.comb += pll.reset.eq(~por_done | self.rst) 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_sys, ~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 self.comb += usb_pll.reset.eq(~por_done | self.rst) 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", sys_clk_freq = int(75e6), with_ethernet = False, with_led_chaser = True, 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/litex-hub/valentyusb -b hw_cdc_eptri") sys.path.append("valentyusb") # SoCCore ---------------------------------------------------------------------------------- SoCCore.__init__(self, platform, sys_clk_freq, ident = "LiteX SoC on Logicbone", **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.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) ) # Ethernet --------------------------------------------------------------------------------- if with_ethernet: self.submodules.ethphy = LiteEthPHYRGMII( clock_pads = self.platform.request("eth_clocks"), pads = self.platform.request("eth")) self.add_ethernet(phy=self.ethphy) # Leds ------------------------------------------------------------------------------------- if with_led_chaser: self.submodules.leds = LedChaser( pads = platform.request_all("user_led"), sys_clk_freq = sys_clk_freq) # Build -------------------------------------------------------------------------------------------- def main(): from litex.soc.integration.soc import LiteXSoCArgumentParser parser = LiteXSoCArgumentParser(description="LiteX SoC on Logicbone") target_group = parser.add_argument_group(title="Target options") target_group.add_argument("--build", action="store_true", help="Build bitstream.") target_group.add_argument("--load", action="store_true", help="Load bitstream.") target_group.add_argument("--toolchain", default="trellis", help="FPGA toolchain (trellis or diamond).") target_group.add_argument("--sys-clk-freq", default=75e6, help="System clock frequency.") target_group.add_argument("--device", default="45F", help="FPGA device (45F or 85F).") target_group.add_argument("--sdram-device", default="MT41K512M16", help="SDRAM device (MT41K512M16).") target_group.add_argument("--with-ethernet", action="store_true", help="Enable Ethernet support.") target_group.add_argument("--with-sdcard", action="store_true", help="Enable SDCard support.") builder_args(parser) soc_core_args(parser) trellis_args(parser) args = parser.parse_args() soc = BaseSoC( toolchain = args.toolchain, device = args.device, sys_clk_freq = int(float(args.sys_clk_freq)), sdram_device = args.sdram_device, with_ethernet = args.with_ethernet, **soc_core_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(builder.get_bitstream_filename(mode="sram")) if __name__ == "__main__": main()