litex-boards/litex_boards/targets/nereid.py

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#!/usr/bin/env python3
# This file is Copyright (c) 2018-2019 Rohit Singh <rohit@rohitksingh.in>
# This file is Copyright (c) 2019 Florent Kermarrec <florent@enjoy-digital.fr>
# License: BSD
import argparse
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.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()
self.comb += pll.reset.eq(platform.request("cpu_reset"))
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.submodules.idelayctrl = S7IDELAYCTRL(self.cd_clk200)
# PCIeSoC -----------------------------------------------------------------------------------------
class PCIeSoC(SoCSDRAM):
SoCSDRAM.mem_map["csr"] = 0x80000000
SoCSDRAM.mem_map["rom"] = 0x20000000
def __init__(self, platform, **kwargs):
sys_clk_freq = int(100e6)
# SoCSDRAM ---------------------------------------------------------------------------------
SoCSDRAM.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on Nereid", ident_version=True,
**kwargs)
# 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)
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)
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():
parser = argparse.ArgumentParser(description="LiteX SoC on Tagus")
builder_args(parser)
soc_sdram_args(parser)
args = parser.parse_args()
args.uart_name = "crossover"
args.csr_data_width = 32
platform = nereid.Platform()
soc = PCIeSoC(platform, **soc_sdram_argdict(args))
builder = Builder(soc, **builder_argdict(args))
vns = builder.build()
soc.generate_software_header("csr.h")
if __name__ == "__main__":
main()