litex/misoclib/com/liteeth/core/udp/crossbar.py

from misoclib.com.liteeth.common import *
from misoclib.com.liteeth.crossbar import LiteEthCrossbar


class LiteEthUDPMasterPort:
    def __init__(self, dw):
        self.dw = dw
        self.source = Source(eth_udp_user_description(dw))
        self.sink = Sink(eth_udp_user_description(dw))


class LiteEthUDPSlavePort:
    def __init__(self, dw):
        self.dw = dw
        self.sink = Sink(eth_udp_user_description(dw))
        self.source = Source(eth_udp_user_description(dw))


class LiteEthUDPUserPort(LiteEthUDPSlavePort):
    def __init__(self, dw):
        LiteEthUDPSlavePort.__init__(self, dw)


class LiteEthUDPCrossbar(LiteEthCrossbar):
    def __init__(self):
        LiteEthCrossbar.__init__(self, LiteEthUDPMasterPort, "dst_port")

    def get_port(self, udp_port, dw=8):
        if udp_port in self.users.keys():
            raise ValueError("Port {0:#x} already assigned".format(udp_port))
        user_port = LiteEthUDPUserPort(dw)
        internal_port = LiteEthUDPUserPort(8)
        if dw != 8:
            converter = Converter(eth_udp_user_description(user_port.dw),
                                  eth_udp_user_description(8))
            self.submodules += converter
            self.comb += [
                Record.connect(user_port.sink, converter.sink),
                Record.connect(converter.source, internal_port.sink)
            ]
            converter = Converter(eth_udp_user_description(8),
                                  eth_udp_user_description(user_port.dw))
            self.submodules += converter
            self.comb += [
                Record.connect(internal_port.source, converter.sink),
                Record.connect(converter.source, user_port.source)
            ]
            self.users[udp_port] = internal_port
        else:
            self.users[udp_port] = user_port
        return user_port