litex-boards/litex_boards/targets/krtkl_snickerdoodle.py

138 lines
5.7 KiB
Python
Executable File

#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2021 Derek Mulcahy <derekmulcahy@gmail.com>
# Copyright (c) 2019-2020 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
import os
from migen import *
from litex_boards.platforms import snickerdoodle
from litex.build.xilinx.vivado import vivado_build_args, vivado_build_argdict
from litex.soc.interconnect import axi
from litex.soc.interconnect import wishbone
from litex.soc.cores.clock import *
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *
from litex.soc.cores.led import LedChaser
# UTILS ---------------------------------------------------------------------------------------------
def load_ps7(soc, xci_file):
odir = os.path.join("build", "snickerdoodle", "gateware", "xci")
os.makedirs(odir, exist_ok=True)
file = "snickerdoodle_ps7.xci"
dst = os.path.join(odir, file)
if xci_file is None:
src = "https://technicaltoys-support.s3.amazonaws.com/xci/" + file
os.system("wget " + src + " -O " + dst)
else:
os.system("cp -p " + xci_file + " " + dst)
soc.cpu.set_ps7_xci(dst)
# CRG ----------------------------------------------------------------------------------------------
class _CRG(Module):
def __init__(self, platform, sys_clk_freq, use_ps7_clk=False):
self.rst = Signal()
self.clock_domains.cd_sys = ClockDomain()
# # #
if use_ps7_clk:
assert sys_clk_freq == 100e6
self.comb += ClockSignal("sys").eq(ClockSignal("ps7"))
self.comb += ResetSignal("sys").eq(ResetSignal("ps7") | self.rst)
else:
self.submodules.pll = pll = S7MMCM(speedgrade=-1)
self.comb += pll.reset.eq(self.rst)
pll.register_clkin(platform.request(platform.default_clk_name),
platform.default_clk_freq)
pll.create_clkout(self.cd_sys, sys_clk_freq)
# Ignore sys_clk to pll.clkin path created by SoC's rst.
platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, variant="z7-10", sys_clk_freq=int(100e6), with_led_chaser=True,
ext_clk_freq = None,
xci_file = None,
**kwargs):
platform = snickerdoodle.Platform(variant=variant)
# CRG --------------------------------------------------------------------------------------
if ext_clk_freq:
platform.default_clk_freq = ext_clk_freq
platform.default_clk_period = 1e9 / ext_clk_freq
use_ps7_clk = (kwargs.get("cpu_type", None) == "zynq7000")
self.submodules.crg = _CRG(platform, sys_clk_freq, use_ps7_clk)
# SoCCore ----------------------------------------------------------------------------------
if kwargs.get("cpu_type", None) == "zynq7000":
kwargs["integrated_sram_size"] = 0
kwargs["with_uart"] = False
self.mem_map = {"csr": 0x4000_0000} # Zynq GP0 default
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Snickerdoodle", **kwargs)
# Zynq7000 Integration ---------------------------------------------------------------------
if kwargs.get("cpu_type", None) == "zynq7000":
load_ps7(self, xci_file)
# Connect AXI GP0 to the SoC with base address of 0x43c00000 (default one)
wb_gp0 = wishbone.Interface()
self.submodules += axi.AXI2Wishbone(
axi = self.cpu.add_axi_gp_master(),
wishbone = wb_gp0,
base_address = self.mem_map['csr'])
self.add_wb_master(wb_gp0)
# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
self.submodules.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
# Build --------------------------------------------------------------------------------------------
def main():
from litex.soc.integration.soc import LiteXSoCArgumentParser
parser = LiteXSoCArgumentParser(description="LiteX SoC on Snickerdoodle")
target_group = parser.add_argument_group(title="Target options")
target_group.add_argument("--build", action="store_true", help="Build bitstream.")
target_group.add_argument("--load", action="store_true", help="Load bitstream.")
target_group.add_argument("--variant", default="z7-10", help="Board variant (z7-10 or z7-20).")
target_group.add_argument("--ext-clk-freq", default=10e6, type=float, help="External Clock Frequency.")
target_group.add_argument("--sys-clk-freq", default=100e6, type=float, help="System clock frequency.")
target_group.add_argument("--xci-file", help="XCI file for PS7 configuration.")
target_group.add_argument("--target", help="Vivado programmer target.")
builder_args(parser)
soc_core_args(parser)
vivado_build_args(parser)
args = parser.parse_args()
soc = BaseSoC(
variant = args.variant,
sys_clk_freq = args.sys_clk_freq,
ext_clk_freq = args.ext_clk_freq,
xci_file = args.xci_file,
**soc_core_argdict(args)
)
builder = Builder(soc, **builder_argdict(args))
builder.build(**vivado_build_argdict(args), run=args.build)
if args.load:
prog = soc.platform.create_programmer()
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"), target=args.target, device=1)
if __name__ == "__main__":
main()