#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2021 Ilia Sergachev <ilia@sergachev.ch>
# SPDX-License-Identifier: BSD-2-Clause
import argparse
from migen import *
from litex_boards.platforms import digilent_zedboard
from litex.build.xilinx.vivado import vivado_build_args, vivado_build_argdict
from litex.build.tools import write_to_file
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.soc import SoCRegion
from litex.soc.integration.builder import *
from litex.soc.cores.led import LedChaser
# 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:
self.comb += ClockSignal("sys").eq(ClockSignal("ps7"))
self.comb += ResetSignal("sys").eq(ResetSignal("ps7") | self.rst)
else:
self.submodules.pll = pll = S7PLL(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, sys_clk_freq, with_led_chaser=True, **kwargs):
platform = digilent_zedboard.Platform()
if kwargs.get("cpu_type", None) == "zynq7000":
kwargs['integrated_sram_size'] = 0
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on Zedboard",
ident_version = True,
**kwargs)
# Zynq7000 Integration ---------------------------------------------------------------------
if kwargs.get("cpu_type", None) == "zynq7000":
self.cpu.set_ps7(name="Zynq",
preset="ZedBoard",
config={'PCW_FPGA0_PERIPHERAL_FREQMHZ': sys_clk_freq / 1e6})
# Connect AXI GP0 to the SoC
wb_gp0 = wishbone.Interface()
self.submodules += axi.AXI2Wishbone(
axi = self.cpu.add_axi_gp_master(),
wishbone = wb_gp0,
base_address = 0x43c0_0000) # default GP0 address on Zynq
self.add_wb_master(wb_gp0)
# FIXME: collection of hacks to enable BIOS compilation
self.bus.add_region("sram", SoCRegion(
origin=128 * 1024 * 1024,
size=256 * 1024 * 1024)
)
self.bus.add_region("rom", SoCRegion(
origin=256 * 1024 * 1024,
size=8 * 1024 * 1024,
linker=True)
)
self.cpu.use_rom = True
self.constants['CONFIG_CLOCK_FREQUENCY'] = 666666687
use_ps7_clk = True
else:
use_ps7_clk = False
# CRG --------------------------------------------------------------------------------------
self.submodules.crg = _CRG(platform, sys_clk_freq, use_ps7_clk)
# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
self.submodules.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
def finalize(self, *args, **kwargs):
super(BaseSoC, self).finalize(*args, **kwargs)
if self.cpu_type != "zynq7000":
return
libxil_path = os.path.join(self.builder.software_dir, 'libxil')
os.makedirs(os.path.realpath(libxil_path), exist_ok=True)
lib = os.path.join(libxil_path, 'embeddedsw')
if not os.path.exists(lib):
os.system("git clone --depth 1 https://github.com/Xilinx/embeddedsw {}".format(lib))
os.makedirs(os.path.realpath(self.builder.include_dir), exist_ok=True)
for header in [
'XilinxProcessorIPLib/drivers/uartps/src/xuartps_hw.h',
'lib/bsp/standalone/src/common/xil_types.h',
'lib/bsp/standalone/src/common/xil_assert.h',
'lib/bsp/standalone/src/common/xil_io.h',
'lib/bsp/standalone/src/common/xil_printf.h',
'lib/bsp/standalone/src/common/xstatus.h',
'lib/bsp/standalone/src/common/xdebug.h',
'lib/bsp/standalone/src/arm/cortexa9/xpseudo_asm.h',
'lib/bsp/standalone/src/arm/cortexa9/xreg_cortexa9.h',
'lib/bsp/standalone/src/arm/cortexa9/xil_cache.h',
'lib/bsp/standalone/src/arm/cortexa9/xparameters_ps.h',
'lib/bsp/standalone/src/arm/cortexa9/xil_errata.h',
'lib/bsp/standalone/src/arm/cortexa9/xtime_l.h',
'lib/bsp/standalone/src/arm/common/xil_exception.h',
'lib/bsp/standalone/src/arm/common/gcc/xpseudo_asm_gcc.h',
]:
shutil.copy(os.path.join(lib, header), self.builder.include_dir)
write_to_file(os.path.join(self.builder.include_dir, 'bspconfig.h'),
'#define FPU_HARD_FLOAT_ABI_ENABLED 1')
write_to_file(os.path.join(self.builder.include_dir, 'xparameters.h'), '''
#ifndef __XPARAMETERS_H
#define __XPARAMETERS_H
#include "xparameters_ps.h"
#define STDOUT_BASEADDRESS 0xE0001000
#define XPAR_PS7_DDR_0_S_AXI_BASEADDR 0x00100000
#define XPAR_PS7_DDR_0_S_AXI_HIGHADDR 0x3FFFFFFF
#endif
''')
# Build --------------------------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description="LiteX SoC on Zedboard")
parser.add_argument("--build", action="store_true", help="Build bitstream")
parser.add_argument("--load", action="store_true", help="Load bitstream")
parser.add_argument("--sys-clk-freq", default=100e6, help="System clock frequency (default: %(default)d)")
builder_args(parser)
soc_core_args(parser)
vivado_build_args(parser)
parser.set_defaults(cpu_type="zynq7000")
parser.set_defaults(no_uart=True)
args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq=int(float(args.sys_clk_freq)),
**soc_core_argdict(args)
)
builder = Builder(soc, **builder_argdict(args))
if args.cpu_type == "zynq7000":
soc.builder = builder
builder.add_software_package('libxil')
builder.add_software_library('libxil')
builder.build(**vivado_build_argdict(args), run=args.build)
if args.load:
prog = soc.platform.create_programmer()
prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bit"))
if __name__ == "__main__":
main()