#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2023 Florent Kermarrec # SPDX-License-Identifier: BSD-2-Clause # Build/Use ---------------------------------------------------------------------------------------- # Build/Load bitstream: # ./ocp_tap_timecard.py --uart-name=crossover --with-pcie --with-smas --build --driver --load (or --flash) # #.Build the kernel and load it: # cd build//driver/kernel # make # sudo ./init.sh # # Test userspace utilities: # cd build//driver/user # make # ./litepcie_util info # ./litepcie_util scratch_test # ./litepcie_util dma_test # ./litepcie_util uart_test import os from migen import * from litex.gen import LiteXModule from litex_boards.platforms import ocp_tap_timecard from litex.soc.interconnect.csr import * from litex.soc.interconnect import stream from litex.soc.integration.soc_core import * from litex.soc.integration.builder import * from litex.soc.cores.clock import * from litex.soc.cores.led import LedChaser from litex.soc.cores.xadc import XADC from litex.soc.cores.dna import DNA from litepcie.phy.s7pciephy import S7PCIEPHY from litepcie.software import generate_litepcie_software # CRG ---------------------------------------------------------------------------------------------- class CRG(LiteXModule): def __init__(self, platform, sys_clk_freq): self.rst = Signal() self.cd_sys = ClockDomain() # Clk/Rst clk200 = platform.request("clk200") # PLL self.pll = pll = S7PLL() self.comb += pll.reset.eq(self.rst) pll.register_clkin(clk200, 200e6) pll.create_clkout(self.cd_sys, sys_clk_freq) platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst. # BaseSoC ----------------------------------------------------------------------------------------- class BaseSoC(SoCCore): def __init__(self, sys_clk_freq=100e6, with_led_chaser = True, with_pcie = False, with_smas = False, **kwargs): platform = ocp_tap_timecard.Platform() # CRG -------------------------------------------------------------------------------------- self.crg = CRG(platform, sys_clk_freq) # SoCCore ---------------------------------------------------------------------------------- SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on OCP-TAP TimeCard", **kwargs) # XADC ------------------------------------------------------------------------------------- self.xadc = XADC() # DNA -------------------------------------------------------------------------------------- self.dna = DNA() self.dna.add_timing_constraints(platform, sys_clk_freq, self.crg.cd_sys.clk) # Leds ------------------------------------------------------------------------------------- if with_led_chaser: self.leds = LedChaser( pads = platform.request_all("user_led"), sys_clk_freq = sys_clk_freq ) # PCIe ------------------------------------------------------------------------------------- if with_pcie: self.pcie_phy = S7PCIEPHY(platform, platform.request("pcie_x1"), data_width = 64, bar0_size = 0x20000) self.add_pcie(phy=self.pcie_phy, ndmas=1, address_width=64) # FIXME: Apply it to all targets (integrate it in LitePCIe?). platform.add_period_constraint(self.crg.cd_sys.clk, 1e9/sys_clk_freq) # ICAP (For FPGA reload over PCIe). from litex.soc.cores.icap import ICAP self.icap = ICAP() self.icap.add_reload() self.icap.add_timing_constraints(platform, sys_clk_freq, self.crg.cd_sys.clk) # Flash (For SPIFlash update over PCIe). from litex.soc.cores.gpio import GPIOOut from litex.soc.cores.spi_flash import S7SPIFlash self.flash_cs_n = GPIOOut(platform.request("flash_cs_n")) self.flash = S7SPIFlash(platform.request("flash"), sys_clk_freq, 25e6) # SMAs ------------------------------------------------------------------------------------- if with_smas: class SMAIOs(LiteXModule): def __init__(self, pcie_data_width=64, io_data_width=4): # Endpoints. self.sink = stream.Endpoint([("data", pcie_data_width)]) self.source = stream.Endpoint([("data", pcie_data_width)]) # CSRs. self.control = CSRStorage(fields=[ CSRField("in_en", size=io_data_width, description="Input enable control (1bit per SMA)."), CSRField("out_en", size=io_data_width, description="Output enable control (1bit per SMA)."), ]) self.output = CSRStorage(io_data_width, description="SMA Reg Output (1bit per SMA).") self.input = CSRStatus(io_data_width, description="SMA Reg Input (1bit per SMA).") # # # # SMA Pads. sma_pads = [platform.request("sma", i) for i in range(io_data_width)] # SMA Buffer Control. for i in range(io_data_width): self.sync += sma_pads[i].dat_in_en.eq( self.control.fields.in_en) self.sync += sma_pads[i].dat_out_en.eq(self.control.fields.in_en) # SMA TX Reg, allow direct (and slow...) control of SMA IOs. for i in range(io_data_width): self.sync += If(self.output.storage[i], sma_pads[i].dat_out.eq(1) ) # SMA TX Data Pipeline. self.tx_converter = tx_converter = stream.Converter(pcie_data_width, io_data_width) self.comb += self.sink.connect(self.tx_converter.sink) self.comb += self.tx_converter.source.ready.eq(1) for i in range(io_data_width): self.sync += If(tx_converter.source.valid & tx_converter.source.data[i], sma_pads[i].dat_out.eq(1) ) # SMA RX Reg, allow direct (and slow...) visualization of SMA IOs. for i in range(io_data_width): self.sync += self.input.status[i].eq(sma_pads[i].dat_in) # SMA RX Data Pipeline. self.rx_converter = stream.Converter(io_data_width, pcie_data_width) self.comb += self.rx_converter.sink.valid.eq(1) for i in range(io_data_width): self.sync += self.rx_converter.sink.data[i].eq(sma_pads[i].dat_in) self.comb += self.rx_converter.source.connect(self.source) self.smas = SMAIOs(pcie_data_width=64, io_data_width=4) self.comb += self.pcie_dma0.source.connect(self.smas.sink) self.comb += self.smas.source.connect(self.pcie_dma0.sink) # Build -------------------------------------------------------------------------------------------- def main(): from litex.build.parser import LiteXArgumentParser parser = LiteXArgumentParser(platform=ocp_tap_timecard.Platform, description="LiteX SoC on OCP-TAP TimeCard.") parser.add_target_argument("--flash", action="store_true", help="Flash bitstream.") parser.add_target_argument("--sys-clk-freq", default=100e6, type=float, help="System clock frequency.") parser.add_target_argument("--with-pcie", action="store_true", help="Enable PCIe support.") parser.add_target_argument("--with-smas", action="store_true", help="Enable SMAs support.") parser.add_target_argument("--driver", action="store_true", help="Generate PCIe driver.") args = parser.parse_args() soc = BaseSoC( sys_clk_freq = args.sys_clk_freq, with_pcie = args.with_pcie, with_smas = args.with_smas, **parser.soc_argdict ) builder = Builder(soc, **parser.builder_argdict) if args.build: builder.build(**parser.toolchain_argdict) if args.driver: generate_litepcie_software(soc, os.path.join(builder.output_dir, "driver")) if args.load: prog = soc.platform.create_programmer() prog.load_bitstream(builder.get_bitstream_filename(mode="sram")) if args.flash: prog = soc.platform.create_programmer() prog.flash(0, builder.get_bitstream_filename(mode="flash")) if __name__ == "__main__": main()