149 lines
5.5 KiB
Python
Executable File
149 lines
5.5 KiB
Python
Executable File
#!/usr/bin/env python3
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# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
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# This file is Copyright (c) 2018-2019 David Shah <dave@ds0.me>
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# License: BSD
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import argparse
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from migen import *
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from migen.genlib.resetsync import AsyncResetSynchronizer
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from litex_boards.platforms import versa_ecp5
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from litex.soc.cores.clock import *
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from litex.soc.integration.soc_sdram import *
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from litex.soc.integration.builder import *
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from litedram.modules import MT41K64M16
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from litedram.phy import ECP5DDRPHY
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from liteeth.phy.ecp5rgmii import LiteEthPHYRGMII
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from liteeth.mac import LiteEthMAC
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# CRG ----------------------------------------------------------------------------------------------
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class _CRG(Module):
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def __init__(self, platform, sys_clk_freq):
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self.clock_domains.cd_init = ClockDomain()
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self.clock_domains.cd_por = ClockDomain(reset_less=True)
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self.clock_domains.cd_sys = ClockDomain()
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self.clock_domains.cd_sys2x = ClockDomain()
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self.clock_domains.cd_sys2x_i = ClockDomain(reset_less=True)
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# # #
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self.cd_init.clk.attr.add("keep")
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self.cd_por.clk.attr.add("keep")
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self.cd_sys.clk.attr.add("keep")
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self.cd_sys2x.clk.attr.add("keep")
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self.cd_sys2x_i.clk.attr.add("keep")
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self.stop = Signal()
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# clk / rst
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clk100 = platform.request("clk100")
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rst_n = platform.request("rst_n")
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platform.add_period_constraint(clk100, 1e9/100e6)
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# power on reset
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por_count = Signal(16, reset=2**16-1)
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por_done = Signal()
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self.comb += self.cd_por.clk.eq(ClockSignal())
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self.comb += por_done.eq(por_count == 0)
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self.sync.por += If(~por_done, por_count.eq(por_count - 1))
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# pll
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self.submodules.pll = pll = ECP5PLL()
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pll.register_clkin(clk100, 100e6)
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pll.create_clkout(self.cd_sys2x_i, 2*sys_clk_freq)
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pll.create_clkout(self.cd_init, 25e6)
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self.specials += [
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Instance("ECLKSYNCB",
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i_ECLKI=self.cd_sys2x_i.clk,
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i_STOP=self.stop,
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o_ECLKO=self.cd_sys2x.clk),
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Instance("CLKDIVF",
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p_DIV="2.0",
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i_ALIGNWD=0,
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i_CLKI=self.cd_sys2x.clk,
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i_RST=self.cd_sys2x.rst,
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o_CDIVX=self.cd_sys.clk),
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AsyncResetSynchronizer(self.cd_init, ~por_done | ~pll.locked | ~rst_n),
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AsyncResetSynchronizer(self.cd_sys, ~por_done | ~pll.locked | ~rst_n)
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]
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# BaseSoC ------------------------------------------------------------------------------------------
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class BaseSoC(SoCSDRAM):
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def __init__(self, sys_clk_freq=int(75e6), toolchain="diamond", **kwargs):
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platform = versa_ecp5.Platform(toolchain=toolchain)
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SoCSDRAM.__init__(self, platform, clk_freq=sys_clk_freq,
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integrated_rom_size=0x8000,
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**kwargs)
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# crg
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crg = _CRG(platform, sys_clk_freq)
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self.submodules.crg = crg
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# sdram
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self.submodules.ddrphy = ECP5DDRPHY(
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platform.request("ddram"),
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sys_clk_freq=sys_clk_freq)
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self.add_csr("ddrphy")
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self.add_constant("ECP5DDRPHY", None)
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self.comb += crg.stop.eq(self.ddrphy.init.stop)
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sdram_module = MT41K64M16(sys_clk_freq, "1:2")
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self.register_sdram(self.ddrphy,
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sdram_module.geom_settings,
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sdram_module.timing_settings)
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# EthernetSoC --------------------------------------------------------------------------------------
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class EthernetSoC(BaseSoC):
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mem_map = {
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"ethmac": 0x30000000, # (shadow @0xb0000000)
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}
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mem_map.update(BaseSoC.mem_map)
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def __init__(self, toolchain="diamond", **kwargs):
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BaseSoC.__init__(self, toolchain=toolchain, **kwargs)
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self.submodules.ethphy = LiteEthPHYRGMII(
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self.platform.request("eth_clocks"),
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self.platform.request("eth"))
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self.add_csr("ethphy")
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self.submodules.ethmac = LiteEthMAC(phy=self.ethphy, dw=32,
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interface="wishbone", endianness=self.cpu.endianness)
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self.add_wb_slave(self.mem_map["ethmac"], self.ethmac.bus, 0x2000)
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self.add_memory_region("ethmac", self.mem_map["ethmac"] | self.shadow_base, 0x2000)
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self.add_csr("ethmac")
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self.add_interrupt("ethmac")
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self.ethphy.crg.cd_eth_rx.clk.attr.add("keep")
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self.ethphy.crg.cd_eth_tx.clk.attr.add("keep")
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self.platform.add_period_constraint(self.ethphy.crg.cd_eth_rx.clk, 1e9/125e6)
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self.platform.add_period_constraint(self.ethphy.crg.cd_eth_tx.clk, 1e9/125e6)
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# Build --------------------------------------------------------------------------------------------
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def main():
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parser = argparse.ArgumentParser(description="LiteX SoC on Versa ECP5")
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parser.add_argument("--gateware-toolchain", dest="toolchain", default="diamond",
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help='gateware toolchain to use, diamond (default) or trellis')
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builder_args(parser)
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soc_sdram_args(parser)
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parser.add_argument("--sys-clk-freq", default=75e6,
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help="system clock frequency (default=75MHz)")
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parser.add_argument("--with-ethernet", action="store_true",
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help="enable Ethernet support")
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args = parser.parse_args()
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cls = EthernetSoC if args.with_ethernet else BaseSoC
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soc = cls(toolchain=args.toolchain, sys_clk_freq=int(float(args.sys_clk_freq)), **soc_sdram_argdict(args))
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builder = Builder(soc, **builder_argdict(args))
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builder.build()
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if __name__ == "__main__":
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main()
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