src/soc/bus/opencores_ethmac.py

   1 #!/usr/bin/env python3
   2 #
   3 # SPDX-License-Identifier: LGPLv3+
   4 # Copyright (C) 2020-2022 Raptor Engineering LLC <support@raptorengineering.com>
   5 # Copyright (C) 2022 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   6 # Sponsored by NLnet and NGI POINTER under EU Grants 871528 and 957073
   7 # Part of the Libre-SOC Project.
   8 #
   9 # this is a wrapper around the opencores verilog 10/100 MAC
  10
  11 from nmigen import (Elaboratable, Cat, Module, Signal, ClockSignal, Instance,
  12                     ResetSignal)
  13
  14 from nmigen_soc.wishbone.bus import Interface
  15 from nmigen_soc.memory import MemoryMap
  16 from lambdasoc.periph.event import IRQLine
  17 from nmigen.utils import log2_int
  18 from nmigen.cli import rtlil, verilog
  19 import os
  20
  21 __all__ = ["EthMAC"]
  22
  23
  24 class EthMAC(Elaboratable):
  25     """Ethernet MAC from opencores, nmigen wrapper.
  26     remember to call EthMAC.add_verilog_source
  27     """
  28
  29     def __init__(self, master_bus=None, slave_bus=None, name=None,
  30                        irq=None, pins=None):
  31         if name is not None:
  32             # convention: give the name in the format "name_number"
  33             self.idx = int(name.split("_")[-1])
  34         else:
  35             self.idx = 0
  36             name = "eth_0"
  37         self.granularity = 8
  38         self.data_width = 32
  39         self.dsize = log2_int(self.data_width//self.granularity)
  40
  41         # set up the wishbone busses
  42         features = frozenset()
  43         if master_bus is None:
  44             master_bus = Interface(addr_width=30,
  45                             data_width=32,
  46                             features=features,
  47                             granularity=8,
  48                             name=name+"_wb_%d_0" % self.idx)
  49         if slave_bus is None:
  50             slave_bus = Interface(addr_width=12,
  51                             data_width=32,
  52                             features=features,
  53                             granularity=8,
  54                             name=name+"_wb_%d_1" % self.idx)
  55         self.master_bus = master_bus
  56         self.slave_bus = slave_bus
  57         if irq is None:
  58             irq = IRQLine()
  59         self.irq = irq
  60
  61         slave_mmap = MemoryMap(addr_width=12+self.dsize,
  62                         data_width=self.granularity)
  63
  64         self.slave_bus.memory_map = slave_mmap
  65
  66         # RMII TX signals
  67         self.mtx_clk = Signal()
  68         self.mtxd = Signal(4)
  69         self.mtxen = Signal()
  70         self.mtxerr = Signal()
  71
  72         # RMII RX signals
  73         self.mrx_clk = Signal()
  74         self.mrxd = Signal(4)
  75         self.mrxdv = Signal()
  76         self.mrxerr = Signal()
  77
  78         # RMII common signals
  79         self.mcoll = Signal()
  80         self.mcrs = Signal()
  81
  82         # RMII management interface signals
  83         self.mdc = Signal()
  84         self.md_in = Signal()
  85         self.md_out = Signal()
  86         self.md_direction = Signal()
  87
  88         # pins resource
  89         self.pins = pins
  90
  91     @classmethod
  92     def add_verilog_source(cls, verilog_src_dir, platform):
  93         # add each of the verilog sources, needed for when doing platform.build
  94         for fname in ['eth_clockgen.v', 'eth_cop.v', 'eth_crc.v', 'eth_fifo.v', 'eth_maccontrol.v', 'ethmac_defines.v', 'eth_macstatus.v', 'ethmac.v', 'eth_miim.v', 'eth_outputcontrol.v', 'eth_random.v', 'eth_receivecontrol.v', 'eth_registers.v', 'eth_register.v', 'eth_rxaddrcheck.v', 'eth_rxcounters.v', 'eth_rxethmac.v', 'eth_rxstatem.v', 'eth_shiftreg.v', 'eth_spram_256x32.v', 'eth_top.v', 'eth_transmitcontrol.v', 'eth_txcounters.v', 'eth_txethmac.v', 'eth_txstatem.v', 'eth_wishbone.v', 'timescale.v']:
  95             # prepend the src directory to each filename, add its contents
  96             fullname = os.path.join(verilog_src_dir, fname)
  97             with open(fullname) as f:
  98                 platform.add_file(fullname, f)
  99
 100     def elaborate(self, platform):
 101         m = Module()
 102         comb = m.d.comb
 103
 104         # Calculate arbiter bus address
 105         spi_bus_adr = Signal(30)
 106         # arbiter address is in words, ethernet master address is in bytes
 107         self.comb += wb_master_bus_adr.eq(self.master_bus.adr >> 2)
 108
 109         # create definition of external verilog EthMAC code here, so that
 110         # nmigen understands I/O directions (defined by i_ and o_ prefixes)
 111         idx, bus = self.idx, self.bus
 112         ethmac = Instance("ethmac",
 113                             # Clock/reset (use DomainRenamer if needed)
 114                             i_wb_clk_i=ClockSignal(),
 115                             i_wb_rst_i=ResetSignal(),
 116
 117                             # Master Wishbone bus signals
 118                             o_m_wb_adr_o=wb_master_bus_adr,
 119                             i_m_wb_dat_i=self.master_bus.dat_w,
 120                             o_m_wb_sel_o=self.master_bus.sel,
 121                             o_m_wb_dat_o=self.master_bus.dat_r,
 122                             i_cfg_wishbone_we_i=self.master_bus.we,
 123                             i_cfg_wishbone_stb_i=self.master_bus.stb,
 124                             o_m_wb_cyc_o=self.master_bus.cyc,
 125                             i_m_wb_ack_i=self.master_bus.ack,
 126
 127                             # Slave Wishbone bus signals
 128                             i_wb_adr_i=self.slave_bus.adr,
 129                             i_wb_dat_i=self.slave_bus.dat_w,
 130                             i_wb_sel_i=self.slave_bus.sel,
 131                             o_wb_dat_o=self.slave_bus.dat_r,
 132                             i_wb_we_i=self.slave_bus.we,
 133                             i_wb_stb_i=self.slave_bus.stb,
 134                             i_wb_cyc_i=self.slave_bus.cyc,
 135                             o_wb_ack_o=self.slave_bus.ack,
 136
 137                             int_o=self.irq.stb,
 138
 139                             # RMII TX
 140                             i_mtx_clk_pad_i=self.mtx_clk,
 141                             o_mtxd_pad_o=self.mtxd,
 142                             o_mtxen_pad_o=self.mtxen,
 143                             o_mtxerr_pad_o=self.mtxerr,
 144
 145                             # RMII RX
 146                             i_mrx_clk_pad_i=self.mrx_clk,
 147                             i_mrxd_pad_i=self.mrxd,
 148                             i_mrxdv_pad_i=self.mrxdv,
 149                             i_mrxerr_pad_i=self.mrxerr,
 150
 151                             # RMII common
 152                             i_mcoll_pad_i=self.mcoll,
 153                             i_mcrs_pad_i=self.mcrs,
 154
 155                             # Management Interface
 156                             o_mdc_pad_o=self.mdc,
 157                             i_md_pad_i=self.md_in,
 158                             o_md_pad_o=self.md_out,
 159                             o_md_padoe_o=self.md_direction
 160                             );
 161
 162         m.submodules['ethmac_%d' % self.idx] = ethmac
 163
 164         if self.pins is not None:
 165             comb += self.mtx_clk.eq(self.pins.mtx_clk.i)
 166             comb += self.pins.mtxd.o.eq(self.mtxd)
 167             comb += self.pins.mtxen.o.eq(self.mtxen)
 168             comb += self.pins.mtxerr.o.eq(self.mtxerr)
 169
 170             comb += self.mrx_clk.eq(self.pins.mrx_clk.i)
 171             comb += self.mrxd.eq(self.pins.mrxd.i)
 172             comb += self.mrxdv.eq(self.pins.mrxdv.i)
 173             comb += self.mrxerr.eq(self.pins.mrxerr.i)
 174             comb += self.mcoll.eq(self.pins.mcoll.i)
 175             comb += self.mcrs.eq(self.pins.mcrs.i)
 176
 177             comb += self.pins.mdc.o.eq(self.mdc)
 178
 179             comb += self.pins.md.o.eq(self.md_out)
 180             comb += self.pins.md.oe.eq(self.md_direction)
 181             comb += self.md_in.eq(self.pins.md.i)
 182         return m
 183
 184
 185 def create_ilang(dut, ports, test_name):
 186     vl = rtlil.convert(dut, name=test_name, ports=ports)
 187     with open("%s.il" % test_name, "w") as f:
 188         f.write(vl)
 189
 190 def create_verilog(dut, ports, test_name):
 191     vl = verilog.convert(dut, name=test_name, ports=ports)
 192     with open("%s.v" % test_name, "w") as f:
 193         f.write(vl)
 194
 195 if __name__ == "__main__":
 196     ethmac = EthMAC(name="eth_0")
 197     create_ilang(ethmac, [ethmac.master_bus.cyc, ethmac.master_bus.stb, ethmac.master_bus.ack,
 198                         ethmac.master_bus.dat_r, ethmac.master_bus.dat_w, ethmac.master_bus.adr,
 199                         ethmac.master_bus.we, ethmac.master_bus.sel,
 200                         ethmac.slave_bus.cyc, ethmac.slave_bus.stb,
 201                         ethmac.slave_bus.ack,
 202                         ethmac.slave_bus.dat_r, ethmac.slave_bus.dat_w,
 203                         ethmac.slave_bus.adr,
 204                         ethmac.slave_bus.we, ethmac.slave_bus.sel,
 205                         ethmac.mtx_clk, ethmac.mtxd, ethmac.mtxen,
 206                         ethmac.mtxerr, ethmac.mrx_clk, ethmac.mrxd,
 207                         ethmac.mrxdv, ethmac.mrxerr, ethmac.mcoll,
 208                         ethmac.mcrs, ethmac.mdc, ethmac.md_in,
 209                         ethmac.md_out, ethmac.md_direction
 210                        ], "eth_0")
 211