Use wishbone interface for CPU port

.gitignore

@@ -1,3 +1,2 @@
 /work/
 *.o
-__pycache__

firmware/Cargo.toml

@@ -1,6 +0,0 @@
-[package]
-name = "firmware"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]

firmware/src/main.rs

@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}

gen_liteeth.py

@@ -43,6 +43,9 @@ _io = [
     # IP/MAC Address.
     ("ip_address",  0, Pins(32)),
 
+    # Interrupt
+    ("interrupt", 0, Pins(1)),
+
     # MII PHY Pads
     ("mii_eth_clocks", 0,
         Subsignal("tx", Pins(1)),
@@ -180,40 +183,26 @@ class UDPCore(PHYCore):
             clk_freq=CLK_FREQ,
             dw=8,
             with_sys_datapath=False,
+            hybrid=True,
         )
 
-        # DHCP port
-        data_width = 32
+        # CPU port
+        nrxslots = self.core.mac.rx_slots.constant
+        ntxslots = self.core.mac.tx_slots.constant
 
-        platform.add_extension(get_udp_streamer_port_ios(
-            "dhcp",
-            data_width=data_width,
-        ))
-        dhcp_ios = platform.request("dhcp")
+        wb_bus = wishbone.Interface()
+        platform.add_extension(wb_bus.get_ios("wishbone"))
+        self.comb += wb_bus.connect_to_pads(self.platform.request("wishbone"), mode="slave")
+        self.add_wb_master(wb_bus)
 
-        dhcp_streamer = LiteEthUDPStreamer(
-            self.core.udp,
-            ip_address=dhcp_ios.ip_address,
-            udp_port=67,
-            data_width=data_width,
-            tx_fifo_depth=64,
-            rx_fifo_depth=64
+        ethmac_region_size = (nrxslots + ntxslots)*buffer_depth
+        ethmac_region = SoCRegion(
+            origin=self.mem_map.get("ethmac", None),
+            size=ethmac_region_size,
+            cached=False
         )
-        self.submodules += dhcp_streamer
-
-        self.comb += [
-            # Connect UDP Sink IOs to UDP Steamer.
-            dhcp_streamer.sink.valid.eq(dhcp_ios.sink_valid),
-            dhcp_streamer.sink.last.eq(dhcp_ios.sink_last),
-            dhcp_ios.sink_ready.eq(dhcp_streamer.sink.ready),
-            dhcp_streamer.sink.data.eq(dhcp_ios.sink_data),
-
-            # Connect UDP Streamer to UDP Source IOs.
-            dhcp_ios.source_valid.eq(dhcp_streamer.source.valid),
-            dhcp_ios.source_last.eq(dhcp_streamer.source.last),
-            dhcp_streamer.source.ready.eq(dhcp_ios.source_ready),
-            dhcp_ios.source_data.eq(dhcp_streamer.source.data),
-        ]
+        self.bus.add_slave(name="ethmac", slave=self.core.mac.bus, region=ethmac_region)
+        self.comb += self.platform.request("interrupt").eq(self.core.mac.ev.irq)
 
         # Pixel port
         data_width = 32

vhdl/arty_a7.vhdl

@@ -36,7 +36,7 @@ entity arty_a7 is
 		-- when necessary
 		pmod_a : out std_logic_vector(7 downto 0);
 		pmod_b : out std_logic_vector(7 downto 0);
-		pmod_c : out std_logic_vector(7 downto 0);
+		pmod_c : in std_logic_vector(7 downto 0);
 		pmod_d : out std_logic_vector(7 downto 0);
 
 		clock_100mhz : in std_logic;
@@ -87,18 +87,19 @@ architecture a of arty_a7 is
 
 			ip_address : in std_logic_vector(31 downto 0);
 
-			--== DHCP PORT ==--
-			dhcp_ip_address : in std_logic_vector(31 downto 0);
-
-			dhcp_sink_valid : in std_logic;
-			dhcp_sink_last : in std_logic;
-			dhcp_sink_ready : out std_logic;
-			dhcp_sink_data : in std_logic_vector(31 downto 0);
-
-			dhcp_source_valid : out std_logic;
-			dhcp_source_last : out std_logic;
-			dhcp_source_ready : in std_logic;
-			dhcp_source_data : out std_logic_vector(31 downto 0);
+			--== WISHBONE PORT ==--
+			wishbone_adr : in std_logic_vector(29 downto 0);
+			wishbone_dat_w : in std_logic_vector(31 downto 0);
+			wishbone_dat_r : out std_logic_vector(31 downto 0);
+			wishbone_sel : in std_logic_vector(3 downto 0);
+			wishbone_cyc : in std_logic;
+			wishbone_stb : in std_logic;
+			wishbone_ack : out std_logic;
+			wishbone_we : in std_logic;
+			wishbone_cti : in std_logic_vector(2 downto 0);
+			wishbone_bte : in std_logic_vector(1 downto 0);
+			wishbone_err : out std_logic;
+			interrupt : out std_logic;
 
 			--== PIXEL DATA PORT ==--
 			pixel_bind_port : in std_logic_vector(15 downto 0);
@@ -247,12 +248,15 @@ begin
 
 		ip_address => x"0a141e28", -- 10.20.30.40
 
-		dhcp_ip_address => x"0a141e29", -- 10.20.30.41
-		dhcp_sink_valid => '0',
-		dhcp_sink_last => '1',
-		dhcp_sink_data => x"cafebebe",
-
-		dhcp_source_ready => '1',
+		--== WISHBONE PORT ==--
+		wishbone_adr => (others => '1'),
+		wishbone_dat_w => (others => '1'),
+		wishbone_sel => (others => '1'),
+		wishbone_cyc => '1',
+		wishbone_stb => '1',
+		wishbone_we => '1',
+		wishbone_cti => (others => '1'),
+		wishbone_bte => (others => '1'),
 
 		--== PIXEL DATA PORT ==--
 		pixel_bind_port => x"effd", -- port 61437 - "PIXEL"
@@ -320,20 +324,9 @@ begin
 
 	sys_reset <= not pll_locked or not n_reset;
 
-	pmod_a <= "00" & drivers(5 downto 0);
-	pmod_b <= "00" & drivers(11 downto 6);
-
-	pmod_c(7) <= '0';
-	pmod_c(6) <= '0';
-	pmod_c(5) <= drivers(17);
-	pmod_c(4) <= drivers(16);
-	pmod_c(3) <= drivers(15);
-	pmod_c(2) <= drivers(14);
-	-- workaround for https://github.com/gatecat/nextpnr-xilinx/issues/42#issuecomment-1183525828
-	pmod_c(1) <= drivers(12);
-	pmod_c(0) <= drivers(13);
-
-	pmod_d <= "00" & drivers(23 downto 18);
+	pmod_a <= drivers(7 downto 0);
+	pmod_b <= drivers(15 downto 8);
+	pmod_d <= drivers(23 downto 16);
 
 	sender: process(sys_clk)
 	begin