130 lines
5.0 KiB
Python
Executable File
130 lines
5.0 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) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
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# SPDX-License-Identifier: BSD-2-Clause
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import os
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import argparse
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from migen import *
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from litex_boards.platforms import fk33
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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 litepcie.phy.usppciephy import USPHBMPCIEPHY
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from litepcie.core import LitePCIeEndpoint, LitePCIeMSI
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from litepcie.frontend.dma import LitePCIeDMA
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from litepcie.frontend.wishbone import LitePCIeWishboneBridge
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from litepcie.software import generate_litepcie_software
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# CRG ----------------------------------------------------------------------------------------------
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class _CRG(Module):
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def __init__(self, platform, sys_clk_freq):
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self.rst = Signal()
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self.clock_domains.cd_sys = ClockDomain()
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# # #
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self.submodules.pll = pll = USPMMCM(speedgrade=-2)
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self.comb += pll.reset.eq(self.rst)
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pll.register_clkin(platform.request("clk200"), 200e6)
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pll.create_clkout(self.cd_sys, sys_clk_freq)
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platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst.
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# BaseSoC ------------------------------------------------------------------------------------------
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class BaseSoC(SoCCore):
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def __init__(self, sys_clk_freq=int(125e6), with_led_chaser=True, with_pcie=False, **kwargs):
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platform = fk33.Platform()
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# SoCCore ----------------------------------------------------------------------------------
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if kwargs.get("uart_name", "serial") == "serial":
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kwargs["uart_name"] = "jtag_uart" # Defaults to JTAG-UART.
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SoCCore.__init__(self, platform, sys_clk_freq,
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ident = "LiteX SoC on FK33",
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ident_version = True,
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**kwargs)
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# CRG --------------------------------------------------------------------------------------
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self.submodules.crg = _CRG(platform, sys_clk_freq)
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# PCIe -------------------------------------------------------------------------------------
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if with_pcie:
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assert self.csr_data_width == 32
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# PHY
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self.submodules.pcie_phy = USPHBMPCIEPHY(platform, platform.request("pcie_x4"),
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data_width = 128,
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bar0_size = 0x20000)
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# Endpoint
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self.submodules.pcie_endpoint = LitePCIeEndpoint(self.pcie_phy, max_pending_requests=8)
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# Wishbone bridge
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self.submodules.pcie_bridge = LitePCIeWishboneBridge(self.pcie_endpoint,
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base_address = self.mem_map["csr"])
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self.add_wb_master(self.pcie_bridge.wishbone)
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# DMA0
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self.submodules.pcie_dma0 = LitePCIeDMA(self.pcie_phy, self.pcie_endpoint,
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with_buffering = True, buffering_depth=1024,
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with_loopback = True)
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self.add_constant("DMA_CHANNELS", 1)
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# MSI
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self.submodules.pcie_msi = LitePCIeMSI()
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self.comb += self.pcie_msi.source.connect(self.pcie_phy.msi)
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self.interrupts = {
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"PCIE_DMA0_WRITER": self.pcie_dma0.writer.irq,
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"PCIE_DMA0_READER": self.pcie_dma0.reader.irq,
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}
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for i, (k, v) in enumerate(sorted(self.interrupts.items())):
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self.comb += self.pcie_msi.irqs[i].eq(v)
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self.add_constant(k + "_INTERRUPT", i)
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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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parser = argparse.ArgumentParser(description="LiteX SoC on FK33")
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parser.add_argument("--build", action="store_true", help="Build bitstream.")
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parser.add_argument("--load", action="store_true", help="Load bitstream.")
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parser.add_argument("--sys-clk-freq", default=125e6, help="System clock frequency.")
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parser.add_argument("--with-pcie", action="store_true", help="Enable PCIe support.")
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parser.add_argument("--driver", action="store_true", help="Generate PCIe driver.")
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builder_args(parser)
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soc_core_args(parser)
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args = parser.parse_args()
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soc = BaseSoC(
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sys_clk_freq = int(float(args.sys_clk_freq)),
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with_pcie=args.with_pcie,
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**soc_core_argdict(args)
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)
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builder = Builder(soc, **builder_argdict(args))
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builder.build(run=args.build)
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if args.driver:
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generate_litepcie_software(soc, os.path.join(builder.output_dir, "driver"))
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if args.load:
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prog = soc.platform.create_programmer()
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prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bit"))
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if __name__ == "__main__":
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main()
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