#!/usr/bin/env python3 # This file is Copyright (c) 2018-2019 Rohit Singh # This file is Copyright (c) 2019 Florent Kermarrec # License: BSD import sys from migen import * from litex.build.generic_platform import * from litex.soc.integration.soc_core import * from litex.soc.integration.soc_sdram import * from litex.soc.integration.builder import * from litex.soc.cores.clock import * from litex.soc.cores import dna, xadc from litex.soc.cores.uart import * from litex.soc.integration.cpu_interface import get_csr_header from litedram.modules import MT8KTF51264 from litedram.modules import _TechnologyTimings, _SpeedgradeTimings from litedram.phy import s7ddrphy from litepcie.phy.s7pciephy import S7PCIEPHY from litepcie.core import LitePCIeEndpoint, LitePCIeMSI from litepcie.frontend.dma import LitePCIeDMA from litepcie.frontend.wishbone import LitePCIeWishboneBridge from litex_boards.platforms import nereid # CRG ---------------------------------------------------------------------------------------------- class CRG(Module): def __init__(self, platform, sys_clk_freq): self.clock_domains.cd_sys = ClockDomain() self.clock_domains.cd_sys4x = ClockDomain(reset_less=True) self.clock_domains.cd_clk200 = ClockDomain() clk100 = platform.request("clk100") self.submodules.pll = pll = S7PLL() pll.register_clkin(clk100, 100e6) pll.create_clkout(self.cd_sys, sys_clk_freq) pll.create_clkout(self.cd_sys4x, 4*sys_clk_freq) pll.create_clkout(self.cd_clk200, 200e6) self.comb += pll.reset.eq(platform.request("cpu_reset")) self.submodules.idelayctrl = S7IDELAYCTRL(self.cd_clk200) # NereidSoC ---------------------------------------------------------------------------------------- class NereidSoC(SoCSDRAM): SoCSDRAM.mem_map["csr"] = 0x80000000 SoCSDRAM.mem_map["rom"] = 0x20000000 def __init__(self, platform, with_pcie_uart=True): sys_clk_freq = int(100e6) # SoCSDRAM --------------------------------------------------------------------------------- SoCSDRAM.__init__(self, platform, sys_clk_freq, csr_data_width = 32, integrated_rom_size = 0x10000, integrated_sram_size = 0x10000, integrated_main_ram_size = 0x10000, # FIXME: keep this for initial PCIe tests ident = "Nereid LiteX Test SoC", ident_version=True, with_uart = not with_pcie_uart) # CRG -------------------------------------------------------------------------------------- self.submodules.crg = CRG(platform, sys_clk_freq) self.add_csr("crg") # DNA -------------------------------------------------------------------------------------- self.submodules.dna = dna.DNA() self.add_csr("dna") # XADC ------------------------------------------------------------------------------------- self.submodules.xadc = xadc.XADC() self.add_csr("xadc") # DDR3 SDRAM ------------------------------------------------------------------------------- if not self.integrated_main_ram_size: self.submodules.ddrphy = s7ddrphy.K7DDRPHY(platform.request("ddram"), memtype = "DDR3", nphases = 4, sys_clk_freq = sys_clk_freq, iodelay_clk_freq = 200e6) self.add_csr("ddrphy") sdram_module = MT8KTF51264(sys_clk_freq, "1:4", speedgrade="800") self.register_sdram(self.ddrphy, geom_settings = sdram_module.geom_settings, timing_settings = sdram_module.timing_settings) # PCIe ------------------------------------------------------------------------------------- # pcie phy self.submodules.pcie_phy = S7PCIEPHY(platform, platform.request("pcie_x1"), bar0_size=0x20000) self.pcie_phy.cd_pcie.clk.attr.add("keep") platform.add_platform_command("create_clock -name pcie_clk -period 8 [get_nets pcie_clk]") platform.add_false_path_constraints(self.crg.cd_sys.clk, self.pcie_phy.cd_pcie.clk) self.add_csr("pcie_phy") # pcie endpoint self.submodules.pcie_endpoint = LitePCIeEndpoint(self.pcie_phy) # pcie wishbone bridge self.submodules.pcie_wishbone = LitePCIeWishboneBridge(self.pcie_endpoint, lambda a: 1, base_address=self.mem_map["csr"]) self.add_wb_master(self.pcie_wishbone.wishbone) # pcie dma self.submodules.pcie_dma = LitePCIeDMA(self.pcie_phy, self.pcie_endpoint, with_buffering=True, buffering_depth=1024, with_loopback=True) self.add_csr("pcie_dma") # pcie msi self.submodules.pcie_msi = LitePCIeMSI() self.add_csr("pcie_msi") self.comb += self.pcie_msi.source.connect(self.pcie_phy.msi) self.msis = { "DMA_WRITER": self.pcie_dma.writer.irq, "DMA_READER": self.pcie_dma.reader.irq } for i, (k, v) in enumerate(sorted(self.msis.items())): self.comb += self.pcie_msi.irqs[i].eq(v) self.add_constant(k + "_INTERRUPT", i) # pcie uart if with_pcie_uart: class PCIeUART(Module, AutoCSR): def __init__(self, uart): self.rx_valid = CSRStatus() self.rx_ready = CSR() self.rx_data = CSRStatus(8) self.tx_valid = CSR() self.tx_ready = CSRStatus() self.tx_data = CSRStorage(8) # # # # cpu to pcie self.comb += [ self.rx_valid.status.eq(uart.sink.valid), uart.sink.ready.eq(self.rx_ready.re), self.rx_data.status.eq(uart.sink.data), ] # pcie to cpu self.sync += [ If(self.tx_valid.re, uart.source.valid.eq(1) ).Elif(uart.source.ready, uart.source.valid.eq(0) ) ] self.comb += [ self.tx_ready.status.eq(~uart.source.valid), uart.source.data.eq(self.tx_data.storage) ] uart_interface = RS232PHYInterface() self.submodules.uart = UART(uart_interface) self.add_csr("uart") self.add_interrupt("uart") self.submodules.pcie_uart = PCIeUART(uart_interface) self.add_csr("pcie_uart") # Leds ------------------------------------------------------------------------------------- # led blinking (sys) sys_counter = Signal(32) self.sync.sys += sys_counter.eq(sys_counter + 1) rgb = platform.request("rgb_led") self.comb += [ rgb.r.eq(1), rgb.g.eq(sys_counter[26]), rgb.b.eq(1), ] def generate_software_header(self, filename): csr_header = get_csr_header(self.csr_regions, self.constants, with_access_functions=False) tools.write_to_file(filename, csr_header) # Build -------------------------------------------------------------------------------------------- def main(): platform = nereid.Platform() soc = NereidSoC(platform) builder = Builder(soc, output_dir="nereid", csr_csv="nereid/csr.csv", compile_gateware=not "no-compile" in sys.argv[1:]) vns = builder.build(build_name="nereid") soc.generate_software_header("nereid/csr.h") if __name__ == "__main__": main()