233 lines
9.5 KiB
Python
Executable File
233 lines
9.5 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# This file is part of LiteX-Boards.
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#
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# Copyright (c) Greg Davill <greg.davill@gmail.com>
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# SPDX-License-Identifier: BSD-2-Clause
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import os
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import sys
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from migen import *
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from migen.genlib.misc import WaitTimer
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from migen.genlib.resetsync import AsyncResetSynchronizer
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from litex_boards.platforms import orangecrab
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from litex.build.lattice.trellis import trellis_args, trellis_argdict
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from litex.soc.cores.clock import *
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from litex.soc.integration.soc_core import *
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from litex.soc.integration.builder import *
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from litex.soc.cores.led import LedChaser
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from litedram.modules import MT41K64M16, MT41K128M16, MT41K256M16, MT41K512M16
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from litedram.phy import ECP5DDRPHY
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# CRG ---------------------------------------------------------------------------------------------
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class _CRG(Module):
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def __init__(self, platform, sys_clk_freq, with_usb_pll=False):
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self.rst = Signal()
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self.clock_domains.cd_por = ClockDomain()
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self.clock_domains.cd_sys = ClockDomain()
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# # #
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# Clk / Rst
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clk48 = platform.request("clk48")
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rst_n = platform.request("usr_btn", loose=True)
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if rst_n is None: rst_n = 1
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# Power on reset
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por_count = Signal(16, reset=2**16-1)
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por_done = Signal()
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self.comb += self.cd_por.clk.eq(clk48)
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self.comb += por_done.eq(por_count == 0)
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self.sync.por += If(~por_done, por_count.eq(por_count - 1))
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# PLL
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self.submodules.pll = pll = ECP5PLL()
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self.comb += pll.reset.eq(~por_done | ~rst_n | self.rst)
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pll.register_clkin(clk48, 48e6)
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pll.create_clkout(self.cd_sys, sys_clk_freq)
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# USB PLL
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if with_usb_pll:
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self.clock_domains.cd_usb_12 = ClockDomain()
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self.clock_domains.cd_usb_48 = ClockDomain()
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usb_pll = ECP5PLL()
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self.submodules += usb_pll
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self.comb += usb_pll.reset.eq(~por_done)
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usb_pll.register_clkin(clk48, 48e6)
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usb_pll.create_clkout(self.cd_usb_48, 48e6)
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usb_pll.create_clkout(self.cd_usb_12, 12e6)
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# FPGA Reset (press usr_btn for 1 second to fallback to bootloader)
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reset_timer = WaitTimer(int(48e6))
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reset_timer = ClockDomainsRenamer("por")(reset_timer)
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self.submodules += reset_timer
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self.comb += reset_timer.wait.eq(~rst_n)
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self.comb += platform.request("rst_n").eq(~reset_timer.done)
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class _CRGSDRAM(Module):
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def __init__(self, platform, sys_clk_freq, with_usb_pll=False):
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self.rst = Signal()
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self.clock_domains.cd_init = ClockDomain()
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self.clock_domains.cd_por = ClockDomain()
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self.clock_domains.cd_sys = ClockDomain()
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self.clock_domains.cd_sys2x = ClockDomain()
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self.clock_domains.cd_sys2x_i = ClockDomain()
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# # #
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self.stop = Signal()
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self.reset = Signal()
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# Clk / Rst
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clk48 = platform.request("clk48")
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rst_n = platform.request("usr_btn", loose=True)
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if rst_n is None: rst_n = 1
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# Power on reset
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por_count = Signal(16, reset=2**16-1)
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por_done = Signal()
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self.comb += self.cd_por.clk.eq(clk48)
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self.comb += por_done.eq(por_count == 0)
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self.sync.por += If(~por_done, por_count.eq(por_count - 1))
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# PLL
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sys2x_clk_ecsout = Signal()
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self.submodules.pll = pll = ECP5PLL()
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self.comb += pll.reset.eq(~por_done | ~rst_n | self.rst)
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pll.register_clkin(clk48, 48e6)
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pll.create_clkout(self.cd_sys2x_i, 2*sys_clk_freq)
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pll.create_clkout(self.cd_init, 24e6)
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self.specials += [
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Instance("ECLKBRIDGECS",
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i_CLK0 = self.cd_sys2x_i.clk,
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i_SEL = 0,
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o_ECSOUT = sys2x_clk_ecsout),
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Instance("ECLKSYNCB",
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i_ECLKI = sys2x_clk_ecsout,
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i_STOP = self.stop,
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o_ECLKO = self.cd_sys2x.clk),
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Instance("CLKDIVF",
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p_DIV = "2.0",
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i_ALIGNWD = 0,
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i_CLKI = self.cd_sys2x.clk,
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i_RST = self.reset,
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o_CDIVX = self.cd_sys.clk),
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AsyncResetSynchronizer(self.cd_sys, ~pll.locked | self.reset),
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]
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# USB PLL
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if with_usb_pll:
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self.clock_domains.cd_usb_12 = ClockDomain()
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self.clock_domains.cd_usb_48 = ClockDomain()
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usb_pll = ECP5PLL()
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self.submodules += usb_pll
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self.comb += usb_pll.reset.eq(~por_done)
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usb_pll.register_clkin(clk48, 48e6)
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usb_pll.create_clkout(self.cd_usb_48, 48e6)
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usb_pll.create_clkout(self.cd_usb_12, 12e6)
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# FPGA Reset (press usr_btn for 1 second to fallback to bootloader)
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reset_timer = WaitTimer(int(48e6))
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reset_timer = ClockDomainsRenamer("por")(reset_timer)
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self.submodules += reset_timer
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self.comb += reset_timer.wait.eq(~rst_n)
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self.comb += platform.request("rst_n").eq(~reset_timer.done)
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# BaseSoC ------------------------------------------------------------------------------------------
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class BaseSoC(SoCCore):
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def __init__(self, revision="0.2", device="25F", sdram_device="MT41K64M16",
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sys_clk_freq=int(48e6), toolchain="trellis", with_led_chaser=True, **kwargs):
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platform = orangecrab.Platform(revision=revision, device=device ,toolchain=toolchain)
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# CRG --------------------------------------------------------------------------------------
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crg_cls = _CRGSDRAM if kwargs.get("integrated_main_ram_size", 0) == 0 else _CRG
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self.submodules.crg = crg_cls(platform, sys_clk_freq, with_usb_pll=True)
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# SoCCore ----------------------------------------------------------------------------------
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# Defaults to USB ACM through ValentyUSB.
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kwargs["uart_name"] = "usb_acm"
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SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on OrangeCrab", **kwargs)
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# DDR3 SDRAM -------------------------------------------------------------------------------
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if not self.integrated_main_ram_size:
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available_sdram_modules = {
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"MT41K64M16": MT41K64M16,
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"MT41K128M16": MT41K128M16,
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"MT41K256M16": MT41K256M16,
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"MT41K512M16": MT41K512M16,
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}
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sdram_module = available_sdram_modules.get(sdram_device)
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ddram_pads = platform.request("ddram")
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self.submodules.ddrphy = ECP5DDRPHY(
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pads = ddram_pads,
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sys_clk_freq = sys_clk_freq,
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dm_remapping = {0:1, 1:0},
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cmd_delay = 0 if sys_clk_freq > 64e6 else 100)
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self.ddrphy.settings.rtt_nom = "disabled"
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if hasattr(ddram_pads, "vccio"):
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self.comb += ddram_pads.vccio.eq(0b111111)
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if hasattr(ddram_pads, "gnd"):
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self.comb += ddram_pads.gnd.eq(0)
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self.comb += self.crg.stop.eq(self.ddrphy.init.stop)
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self.comb += self.crg.reset.eq(self.ddrphy.init.reset)
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self.add_sdram("sdram",
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phy = self.ddrphy,
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module = sdram_module(sys_clk_freq, "1:2"),
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l2_cache_size = kwargs.get("l2_size", 8192)
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)
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# Leds -------------------------------------------------------------------------------------
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if with_led_chaser:
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self.submodules.leds = LedChaser(
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pads = platform.request_all("user_led"),
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sys_clk_freq = sys_clk_freq)
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# Build --------------------------------------------------------------------------------------------
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def main():
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from litex.soc.integration.soc import LiteXSoCArgumentParser
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parser = LiteXSoCArgumentParser(description="LiteX SoC on OrangeCrab")
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target_group = parser.add_argument_group(title="Target options")
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target_group.add_argument("--build", action="store_true", help="Build bitstream.")
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target_group.add_argument("--load", action="store_true", help="Load bitstream.")
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target_group.add_argument("--toolchain", default="trellis", help="FPGA toolchain (trellis or diamond).")
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target_group.add_argument("--sys-clk-freq", default=48e6, help="System clock frequency.")
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target_group.add_argument("--revision", default="0.2", help="Board Revision (0.1 or 0.2).")
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target_group.add_argument("--device", default="25F", help="ECP5 device (25F, 45F or 85F).")
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target_group.add_argument("--sdram-device", default="MT41K64M16", help="SDRAM device (MT41K64M16, MT41K128M16, MT41K256M16 or MT41K512M16).")
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target_group.add_argument("--with-spi-sdcard", action="store_true", help="Enable SPI-mode SDCard support.")
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builder_args(parser)
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soc_core_args(parser)
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trellis_args(parser)
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args = parser.parse_args()
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soc = BaseSoC(
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toolchain = args.toolchain,
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revision = args.revision,
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device = args.device,
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sdram_device = args.sdram_device,
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sys_clk_freq = int(float(args.sys_clk_freq)),
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**soc_core_argdict(args))
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if args.with_spi_sdcard:
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soc.add_spi_sdcard()
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builder = Builder(soc, **builder_argdict(args))
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builder_kargs = trellis_argdict(args) if args.toolchain == "trellis" else {}
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builder.build(**builder_kargs, run=args.build)
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if args.load:
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prog = soc.platform.create_programmer()
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prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))
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if __name__ == "__main__":
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main()
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