litex-boards/litex_boards/targets/sipeed_tang_nano_9k.py

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#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2022 Icenowy Zheng <icenowy@aosc.io>
# SPDX-License-Identifier: BSD-2-Clause
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex.soc.cores.clock.gowin_gw1n import GW1NPLL
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
from litex.soc.cores.video import *
from litex_boards.platforms import tang_nano_9k
from litex.soc.cores.hyperbus import HyperRAM
kB = 1024
mB = 1024*kB
# CRG ----------------------------------------------------------------------------------------------
class _CRG(Module):
def __init__(self, platform, sys_clk_freq, with_video_pll=False):
self.rst = Signal()
self.clock_domains.cd_sys = ClockDomain()
# # #
# Clk / Rst
clk27 = platform.request("clk27")
rst_n = platform.request("user_btn", 0)
# PLL
self.submodules.pll = pll = GW1NPLL(devicename=platform.devicename, device=platform.device)
self.comb += pll.reset.eq(~rst_n)
pll.register_clkin(clk27, 27e6)
pll.create_clkout(self.cd_sys, sys_clk_freq)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=int(27e6), bios_flash_offset=0x0,
with_led_chaser=True, **kwargs):
platform = tang_nano_9k.Platform()
# Disable Integrated ROM
kwargs["integrated_rom_size"] = 0
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on Tang Nano 9K",
**kwargs)
# CRG --------------------------------------------------------------------------------------
self.submodules.crg = _CRG(platform, sys_clk_freq)
# SPI Flash --------------------------------------------------------------------------------
from litespi.modules import W25Q32
from litespi.opcodes import SpiNorFlashOpCodes as Codes
self.add_spi_flash(mode="1x", module=W25Q32(Codes.READ_1_1_1), with_master=False)
# Add ROM linker region --------------------------------------------------------------------
self.bus.add_region("rom", SoCRegion(
origin = self.bus.regions["spiflash"].origin + bios_flash_offset,
size = 64*kB,
linker = True)
)
self.cpu.set_reset_address(self.bus.regions["rom"].origin)
# HyperRAM ---------------------------------------------------------------------------------
if not self.integrated_main_ram_size:
# TODO: Use second 32Mbit PSRAM chip.
dq = platform.request("IO_psram_dq")
rwds = platform.request("IO_psram_rwds")
reset_n = platform.request("O_psram_reset_n")
cs_n = platform.request("O_psram_cs_n")
ck = platform.request("O_psram_ck")
ck_n = platform.request("O_psram_ck_n")
class HyperRAMPads:
def __init__(self, n):
self.clk = Signal()
self.rst_n = reset_n[n]
self.dq = dq[8*n:8*(n+1)]
self.cs_n = cs_n[n]
self.rwds = rwds[n]
hyperram_pads = HyperRAMPads(0)
self.comb += ck[0].eq(hyperram_pads.clk)
self.comb += ck_n[0].eq(~hyperram_pads.clk)
self.submodules.hyperram = HyperRAM(hyperram_pads)
self.bus.add_slave("main_ram", slave=self.hyperram.bus, region=SoCRegion(origin=self.mem_map["main_ram"], size=4*mB))
# 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 Tang Nano 9K")
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("--flash", action="store_true", help="Flash Bitstream.")
target_group.add_argument("--sys-clk-freq",default=27e6, help="System clock frequency.")
target_group.add_argument("--bios-flash-offset", default="0x0", help="BIOS offset in SPI Flash.")
target_group.add_argument("--with-spi-sdcard", action="store_true", help="Enable SPI-mode SDCard support.")
target_group.add_argument("--prog-kit", default="openfpgaloader", help="Programmer select from Gowin/openFPGALoader.")
builder_args(parser)
soc_core_args(parser)
args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq=int(float(args.sys_clk_freq)),
bios_flash_offset=int(args.bios_flash_offset, 0),
**soc_core_argdict(args)
)
if args.with_spi_sdcard:
soc.add_spi_sdcard()
builder = Builder(soc, **builder_argdict(args))
builder.build(run=args.build)
if args.load:
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prog = soc.platform.create_programmer(kit=args.prog_kit)
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))
if args.flash:
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prog = soc.platform.create_programmer(kit=args.prog_kit)
prog.flash(0, builder.get_bitstream_filename(mode="flash", ext=".fs")) # FIXME
# Axternal SPI programming not supported by gowin 'programmer_cli' now!
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# if needed, use openFPGALoader or Gowin programmer GUI
if args.prog_kit == "openfpgaloader":
prog.flash(int(args.bios_flash_offset, 0), builder.get_bios_filename(), external=True)
if __name__ == "__main__":
main()