core/udp: Add `with_dhcp` argument and remove dhcp plumbing from core generator

examples/udp_raw_ecp5rgmii.yml

@@ -9,11 +9,11 @@ device: LFE5U-25F-6BG256C
 vendor: lattice
 toolchain: trellis
 # Core -------------------------------------------------------------------------
-clk_freq: 125e6
+clk_freq: 50e6
 core: udp
 
 mac_address: 0x10e2d5000000
-ip_address: 172.30.0.1
+dhcp: True
 
 tx_cdc_depth: 16
 tx_cdc_buffered: True

liteeth/core/__init__.py

@@ -81,6 +81,7 @@ class LiteEthIPCore(Module, AutoCSR):
 class LiteEthUDPIPCore(LiteEthIPCore):
     def __init__(self, phy, mac_address, ip_address, clk_freq, arp_entries=1, dw=8,
         with_icmp         = True,
+        with_dhcp         = False,
         with_ip_broadcast = True,
         with_sys_datapath = False,
         tx_cdc_depth      = 32,
@@ -90,9 +91,15 @@ class LiteEthUDPIPCore(LiteEthIPCore):
         interface         = "crossbar",
         endianness        = "big",
     ):
+        # Ensure either IP is external or DHCP is used
+        assert((ip_address is None) == with_dhcp)
+
         # Parameters.
         # -----------
-        ip_address = convert_ip(ip_address)
+        if ip_address is not None:
+            ip_address = convert_ip(ip_address)
+        else:
+            ip_address = Signal(32)
 
         # Core: MAC + ARP + IP + (ICMP).
         # ------------------------------
@@ -113,10 +120,13 @@ class LiteEthUDPIPCore(LiteEthIPCore):
             rx_cdc_depth      = rx_cdc_depth,
             rx_cdc_buffered   = rx_cdc_buffered,
         )
-        # UDP.
-        # ----
+        # UDP + (DHCP).
+        # -------------
         self.submodules.udp = LiteEthUDP(
-            ip         = self.ip,
-            ip_address = ip_address,
-            dw         = dw,
+            ip          = self.ip,
+            mac_address = mac_address,
+            ip_address  = ip_address,
+            clk_freq    = clk_freq,
+            with_dhcp   = with_dhcp,
+            dw          = dw,
         )

liteeth/core/udp.py

@@ -11,6 +11,7 @@ from litex.soc.interconnect import stream
 from liteeth.common import *
 from liteeth.crossbar import LiteEthCrossbar
 from liteeth.packet import Depacketizer, Packetizer
+from liteeth.core.dhcp import DHCP_CLIENT_PORT, LiteEthDHCP
 
 # UDP Crossbar -------------------------------------------------------------------------------------
 
@@ -231,7 +232,7 @@ class LiteEthUDPRX(LiteXModule):
 # UDP ----------------------------------------------------------------------------------------------
 
 class LiteEthUDP(LiteXModule):
-    def __init__(self, ip, ip_address, dw=8):
+    def __init__(self, ip, ip_address, mac_address, clk_freq, with_dhcp = False, dw=8):
         self.tx = tx = LiteEthUDPTX(ip_address, dw)
         self.rx = rx = LiteEthUDPRX(ip_address, dw)
         ip_port = ip.crossbar.get_port(udp_protocol, dw)
@@ -244,3 +245,11 @@ class LiteEthUDP(LiteXModule):
             crossbar.master.source.connect(tx.sink),
             rx.source.connect(crossbar.master.sink)
         ]
+
+        if with_dhcp:
+            dhcp_udp_port = self.crossbar.get_port(DHCP_CLIENT_PORT, dw=32, cd="sys")
+            self.dhcp = dhcp = LiteEthDHCP(dhcp_udp_port, clk_freq)
+            self.comb += [
+                dhcp.mac_address.eq(mac_address),
+                ip_address.eq(dhcp.ip_address),
+            ]

liteeth/gen.py

@@ -67,14 +67,6 @@ _io = [
     # Interrupt
     ("interrupt", 0, Pins(1)),
 
-    # DHCP.
-    ("dhcp", 0,
-        Subsignal("start",      Pins(1)),
-        Subsignal("done",       Pins(1)),
-        Subsignal("timeout",    Pins(1)),
-        Subsignal("ip_address", Pins(32)),
-    ),
-
     # MII PHY Pads
     ("mii_clocks", 0,
         Subsignal("tx", Pins(1)),
@@ -520,11 +512,9 @@ class UDPCore(PHYCore):
         # IP Address.
         dhcp       = core_config.get("dhcp", False)
         ip_address = core_config.get("ip_address", None)
-        # Get IP Address from IOs when not specified.
-        if ip_address is None:
+        # Get IP Address from IOs when not specified and DHCP is not used
+        if ip_address is None and not dhcp:
             ip_address = platform.request("ip_address")
-        else:
-            assert not dhcp
 
         # PHY --------------------------------------------------------------------------------------
         PHYCore.__init__(self, platform, core_config)
@@ -534,6 +524,7 @@ class UDPCore(PHYCore):
         self.core = LiteEthUDPIPCore(self.ethphy,
             mac_address       = mac_address,
             ip_address        = ip_address,
+            with_dhcp         = dhcp,
             clk_freq          = core_config["clk_freq"],
             dw                = data_width,
             with_sys_datapath = (data_width == 32),
@@ -543,23 +534,6 @@ class UDPCore(PHYCore):
             rx_cdc_buffered   = rx_cdc_buffered,
         )
 
-        # DHCP -------------------------------------------------------------------------------------
-
-        if dhcp:
-            dhcp_pads = platform.request("dhcp")
-            dhcp_port = self.core.udp.crossbar.get_port(68, dw=32, cd="sys")
-            if isinstance(mac_address, Signal):
-                dhcp_mac_address = mac_address
-            else:
-                dhcp_mac_address = Signal(48, reset=0x10e2d5000001)
-            self.dhcp = LiteEthDHCP(udp_port=dhcp_port, sys_clk_freq=self.sys_clk_freq)
-            self.comb += [
-                self.dhcp.start.eq(dhcp_pads.start),
-                dhcp_pads.done.eq(self.dhcp.done),
-                dhcp_pads.timeout.eq(self.dhcp.timeout),
-                dhcp_pads.ip_address.eq(self.dhcp.ip_address),
-            ]
-
         # Etherbone --------------------------------------------------------------------------------
 
         etherbone              = core_config.get("etherbone", False)