Add initial LiteX M2 Baseboard support with Clk/Serial/Buttons.

litex_boards/platforms/litex_m2_baseboard.py

@@ -0,0 +1,47 @@
+#
+# This file is part of LiteX-Boards.
+#
+# Copyright (c) 2021 Ilia Sergachev <ilia.sergachev@protonmail.ch>
+# Copyright (c) 2021 Florent Kermarrec <florent@enjoy-digital.fr>
+# SPDX-License-Identifier: BSD-2-Clause
+
+from litex.build.generic_platform import *
+from litex.build.lattice import LatticePlatform
+from litex.build.openfpgaloader import OpenFPGALoader
+
+# IOs ----------------------------------------------------------------------------------------------
+
+_io = [
+    # Clk / Rst
+    ("clk50", 0, Pins("L19"), IOStandard("LVCMOS33")),
+
+    # Serial
+    ("serial", 0,
+        Subsignal("rx", Pins("B20"), IOStandard("LVCMOS33")),
+        Subsignal("tx", Pins("A19"), IOStandard("LVCMOS33")),
+    ),
+
+    # Buttons
+    ("user_btn", 0, Pins("M19"), IOStandard("LVCMOS33")),
+    ("user_btn", 1, Pins("M20"), IOStandard("LVCMOS33")),
+]
+
+# Connectors ---------------------------------------------------------------------------------------
+
+_connectors = []
+
+# Platform -----------------------------------------------------------------------------------------
+
+class Platform(LatticePlatform):
+    default_clk_name   = "clk50"
+    default_clk_period = 1e9/506
+
+    def __init__(self, toolchain="trellis", **kwargs):
+        LatticePlatform.__init__(self, "LFE5UM5G-45F-8BG381I", _io, _connectors, toolchain=toolchain, **kwargs)
+
+    def create_programmer(self):
+        return OpenFPGALoader("ecpix5")
+
+    def do_finalize(self, fragment):
+        LatticePlatform.do_finalize(self, fragment)
+        self.add_period_constraint(self.lookup_request("clk50", loose=True), 1e9/50e6)

litex_boards/targets/litex_m2_baseboard.py

@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+
+#
+# This file is part of LiteX-Boards.
+#
+# Copyright (c) 2021 Florent Kermarrec <florent@enjoy-digital.fr>
+# SPDX-License-Identifier: BSD-2-Clause
+
+import os
+import argparse
+import sys
+
+from migen import *
+
+from litex_boards.platforms import litex_m2_baseboard
+
+from litex.build.lattice.trellis import trellis_args, trellis_argdict
+
+from litex.soc.cores.clock import *
+from litex.soc.integration.soc_core import *
+from litex.soc.integration.builder import *
+
+# CRG ----------------------------------------------------------------------------------------------
+
+class _CRG(Module):
+    def __init__(self, platform, sys_clk_freq):
+        self.rst = Signal()
+        self.clock_domains.cd_por     = ClockDomain(reset_less=True)
+        self.clock_domains.cd_sys     = ClockDomain()
+        # # #
+
+        # Clk / Rst
+        clk50 = platform.request("clk50")
+
+        # Power on reset
+        por_count = Signal(16, reset=2**16-1)
+        por_done  = Signal()
+        self.comb += self.cd_por.clk.eq(clk50)
+        self.comb += por_done.eq(por_count == 0)
+        self.sync.por += If(~por_done, por_count.eq(por_count - 1))
+
+        # PLL
+        self.submodules.pll = pll = ECP5PLL()
+        self.comb += pll.reset.eq(~por_done | self.rst)
+        pll.register_clkin(clk50, 50e6)
+        pll.create_clkout(self.cd_sys, sys_clk_freq)
+
+# BaseSoC ------------------------------------------------------------------------------------------
+
+class BaseSoC(SoCCore):
+    def __init__(self, sys_clk_freq=int(75e6), **kwargs):
+        platform = litex_m2_baseboard.Platform(toolchain="trellis")
+
+        # SoCCore ----------------------------------------------------------------------------------
+        SoCCore.__init__(self, platform, sys_clk_freq,
+            ident          = "LiteX SoC on LiteX M2 Baseboard",
+            ident_version  = True,
+            **kwargs)
+
+        # CRG --------------------------------------------------------------------------------------
+        self.submodules.crg = _CRG(platform, sys_clk_freq)
+
+# Build --------------------------------------------------------------------------------------------
+
+def main():
+    parser = argparse.ArgumentParser(description="LiteX SoC on LiteX M2 Baseboard")
+    parser.add_argument("--build",        action="store_true", help="Build bitstream")
+    parser.add_argument("--load",         action="store_true", help="Load bitstream")
+    parser.add_argument("--flash",        action="store_true", help="Flash bitstream to SPI Flash")
+    parser.add_argument("--sys-clk-freq", default=75e6,        help="System clock frequency (default: 75MHz)")
+    builder_args(parser)
+    soc_core_args(parser)
+    trellis_args(parser)
+    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))
+    builder.build(**trellis_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 args.flash:
+        prog = soc.platform.create_programmer()
+        prog.flash(None, os.path.join(builder.gateware_dir, soc.build_name + ".bit"))
+
+if __name__ == "__main__":
+    main()