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litex-boards/litex_boards/partner/targets/fomu.py

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#!/usr/bin/env python3
# This file is Copyright (c) 2019 Sean Cross <sean@xobs.io>
# This file is Copyright (c) 2018 David Shah <dave@ds0.me>
# License: BSD
import argparse
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex.soc.cores import up5kspram
from litex.soc.integration import SoCCore
from litex.soc.integration.builder import Builder, builder_argdict, builder_args
from litex.soc.integration.soc_core import soc_core_argdict, soc_core_args
from valentyusb.usbcore import io as usbio
from valentyusb.usbcore.cpu import dummyusb, epfifo
import os, shutil, subprocess
# CRG ----------------------------------------------------------------------------------------------
class _CRG(Module):
def __init__(self, platform):
clk48_raw = platform.request("clk48")
clk12 = Signal()
reset_delay = Signal(12, reset=4095)
self.clock_domains.cd_por = ClockDomain()
self.reset = Signal()
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_usb_12 = ClockDomain()
self.clock_domains.cd_usb_48 = ClockDomain()
platform.add_period_constraint(self.cd_usb_48.clk, 1e9/48e6)
platform.add_period_constraint(self.cd_sys.clk, 1e9/12e6)
platform.add_period_constraint(self.cd_usb_12.clk, 1e9/12e6)
platform.add_period_constraint(clk48_raw, 1e9/48e6)
# POR reset logic- POR generated from sys clk, POR logic feeds sys clk
# reset.
self.comb += [
self.cd_por.clk.eq(self.cd_sys.clk),
self.cd_sys.rst.eq(reset_delay != 0),
self.cd_usb_12.rst.eq(reset_delay != 0),
]
# POR reset logic- POR generated from sys clk, POR logic feeds sys clk
# reset.
self.comb += [
self.cd_usb_48.rst.eq(reset_delay != 0),
]
self.comb += self.cd_usb_48.clk.eq(clk48_raw)
self.specials += Instance(
"SB_PLL40_CORE",
# Parameters
p_DIVR = 0,
p_DIVF = 15,
p_DIVQ = 5,
p_FILTER_RANGE = 1,
p_FEEDBACK_PATH = "SIMPLE",
p_DELAY_ADJUSTMENT_MODE_FEEDBACK = "FIXED",
p_FDA_FEEDBACK = 15,
p_DELAY_ADJUSTMENT_MODE_RELATIVE = "FIXED",
p_FDA_RELATIVE = 0,
p_SHIFTREG_DIV_MODE = 1,
p_PLLOUT_SELECT = "GENCLK_HALF",
p_ENABLE_ICEGATE = 0,
# IO
i_REFERENCECLK = clk48_raw,
o_PLLOUTCORE = clk12,
# o_PLLOUTGLOBAL = clk12,
#i_EXTFEEDBACK,
#i_DYNAMICDELAY,
#o_LOCK,
i_BYPASS = 0,
i_RESETB = 1,
#i_LATCHINPUTVALUE,
#o_SDO,
#i_SDI,
)
self.comb += self.cd_sys.clk.eq(clk12)
self.comb += self.cd_usb_12.clk.eq(clk12)
self.sync.por += \
If(reset_delay != 0,
reset_delay.eq(reset_delay - 1)
)
self.specials += AsyncResetSynchronizer(self.cd_por, self.reset)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
"""A SoC on Fomu, optionally with a softcore CPU"""
# Create a default CSR map to prevent values from getting reassigned.
# This increases consistency across litex versions.
SoCCore.csr_map = {
"ctrl": 0, # provided by default (optional)
"crg": 1, # user
"uart_phy": 2, # provided by default (optional)
"uart": 3, # provided by default (optional)
"identifier_mem": 4, # provided by default (optional)
"timer0": 5, # provided by default (optional)
"cpu_or_bridge": 8,
"usb": 9,
"picorvspi": 10,
"touch": 11,
"reboot": 12,
"rgb": 13,
"version": 14,
}
# Statically-define the memory map, to prevent it from shifting across
# various litex versions.
SoCCore.mem_map = {
"rom": 0x00000000, # (default shadow @0x80000000)
"sram": 0x10000000, # (default shadow @0xa0000000)
"spiflash": 0x20000000, # (default shadow @0xa0000000)
"main_ram": 0x40000000, # (default shadow @0xc0000000)
"csr": 0x60000000, # (default shadow @0xe0000000)
}
interrupt_map = {
"usb": 3,
}
interrupt_map.update(SoCCore.interrupt_map)
def __init__(self, board,
pnr_placer=None, pnr_seed=0, usb_core="dummyusb", usb_bridge=False,
**kwargs):
"""Create a basic SoC for Fomu.
Create a basic SoC for Fomu, including a 48 MHz and 12 MHz clock
domain called `usb_48` and `usb_12`. The `sys` frequency will
run at 12 MHz.
The USB core will optionally have a bridge to the Wishbone bus.
Args:
board (str): Which Fomu board to build for: pvt, evt, or hacker
pnr_placer (str): Which placer to use in nextpnr
pnr_seed (int): Which seed to use in nextpnr
usb_core (str): The name of the USB core to use, if any: dummyusb, epfifo
usb_bridge (bool): Whether to include a USB-to-Wishbone bridge
Raises:
ValueError: If either the `usb_core` or `board` are unrecognized
Returns:
Newly-constructed SoC
"""
if board == "pvt":
from litex_boards.partner.platforms.fomu_pvt import Platform
elif board == "hacker":
from litex_boards.partner.platforms.fomu_hacker import Platform
elif board == "evt":
from litex_boards.partner.platforms.fomu_evt import Platform
else:
raise ValueError("unrecognized fomu board: {}".format(board))
platform = Platform()
clk_freq = int(12e6)
SoCCore.__init__(self, platform, clk_freq,
cpu_type=None,
cpu_variant=None,
integrated_sram_size=0,
with_uart=False,
with_ctrl=False,
**kwargs)
self.submodules.crg = _CRG(platform)
# UP5K has single port RAM, which is a dedicated 128 kilobyte block.
# Use this as CPU RAM.
spram_size = 128*1024
self.submodules.spram = up5kspram.Up5kSPRAM(size=spram_size)
self.register_mem("sram", 0x10000000, self.spram.bus, spram_size)
if usb_core is not None:
# Add USB pads. We use DummyUsb, which simply enumerates as a USB
# device. Then all interaction is done via the wishbone bridge.
usb_pads = platform.request("usb")
usb_iobuf = usbio.IoBuf(usb_pads.d_p, usb_pads.d_n, usb_pads.pullup)
if usb_core == "dummyusb":
self.submodules.usb = dummyusb.DummyUsb(usb_iobuf, debug=usb_bridge)
elif usb_core == "epfifo":
self.submodules.usb = epfifo.PerEndpointFifo(usb_iobuf, debug=usb_bridge)
else:
raise ValueError("unrecognized usb_core: {}".args(usb_core))
if usb_bridge:
self.add_wb_master(self.usb.debug_bridge.wishbone)
# Add "-relut -dffe_min_ce_use 4" to the synth_ice40 command.
# "-reult" adds an additional LUT pass to pack more stuff in, and
# "-dffe_min_ce_use 4" flag prevents Yosys from generating a
# Clock Enable signal for a LUT that has fewer than 4 flip-flops.
# This increases density, and lets us use the FPGA more efficiently.
platform.toolchain.nextpnr_yosys_template[2] += " -relut -dffe_min_ce_use 4"
# Allow us to set the nextpnr seed, because some values don't meet timing.
platform.toolchain.nextpnr_build_template[1] += " --seed " + str(pnr_seed)
# Different placers can improve packing efficiency, however not all placers
# are enabled on all builds of nextpnr-ice40. Let the user override which
# placer they want to use.
if pnr_placer is not None:
platform.toolchain.nextpnr_build_template[1] += " --placer {}".format(pnr_placer)
# Build --------------------------------------------------------------------------------------------
def add_dfu_suffix(fn):
fn_base, _ext = os.path.splitext(fn)
fn_dfu = fn_base + '.dfu'
shutil.copyfile(fn, fn_dfu)
subprocess.check_call(['dfu-suffix', '--pid', '1209', '--vid', '5bf0', '--add', fn_dfu])
def main():
parser = argparse.ArgumentParser(description="LiteX SoC on Fomu")
parser.add_argument(
"--board", choices=["evt", "pvt", "hacker"], required=True,
help="build for a particular hardware board"
)
parser.add_argument(
"--seed", default=0, help="seed to use in nextpnr"
)
parser.add_argument(
"--placer", default="heap", choices=["sa", "heap"], help="which placer to use in nextpnr"
)
builder_args(parser)
soc_core_args(parser)
args = parser.parse_args()
soc = BaseSoC(board=args.board, pnr_placer=args.placer, pnr_seed=args.seed,
debug=True, **soc_core_argdict(args))
builder = Builder(soc, **builder_argdict(args))
builder.build()
if __name__ == "__main__":
main()
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