Added support for Digilent Genesys 2 target

Mikołaj Sowiński · Mikołaj Sowiński · commit 2da83771fc9d · 2022-08-29T19:14:42.000+02:00
- ported S7 RGMII from LiteEth
- added support for 1x non-IO SPI flash (had problems with x4 IO operation)
- added Digilent Genesys 2 target
diff --git a/misoc/cores/liteeth_mini/phy/s7rgmii.py b/misoc/cores/liteeth_mini/phy/s7rgmii.py
@@ -0,0 +1,258 @@
+#
+# This file is part of LiteEth, backported to MiSoC.
+#
+# Copyright (c) 2015-2020 Florent Kermarrec <florent@enjoy-digital.fr>
+# Copyright (c) 2022-2022 Mikolaj Sowinski <msowinski@technosystem.com.pl>
+# SPDX-License-Identifier: BSD-2-Clause
+
+# RGMII PHY for 7-Series Xilinx FPGA
+
+from migen import *
+from migen.genlib.resetsync import AsyncResetSynchronizer
+
+from misoc.interconnect.csr import *
+from misoc.interconnect import stream
+from misoc.cores.liteeth_mini.common import *
+
+
+class LiteEthPHYHWReset(Module):
+    def __init__(self, cycles=256):
+        self.reset = Signal()
+
+        # # #
+
+        counter      = Signal(max=cycles + 1)
+        counter_done = Signal()
+        counter_ce   = Signal()
+        self.sync += If(counter_ce, counter.eq(counter + 1))
+        self.comb += [
+            counter_done.eq(counter == cycles),
+            counter_ce.eq(~counter_done),
+            self.reset.eq(~counter_done)
+        ]
+
+
+class LiteEthPHYRGMIITX(Module):
+    def __init__(self, pads):
+        self.sink = sink = stream.Endpoint(eth_phy_layout(8))
+
+        # # #
+
+        tx_ctl_obuf  = Signal()
+        tx_data_obuf = Signal(4)
+
+        self.specials += [
+            Instance("ODDR",
+                p_DDR_CLK_EDGE = "SAME_EDGE",
+                i_C  = ClockSignal("eth_tx"),
+                i_CE = 1,
+                i_S  = 0,
+                i_R  = 0,
+                i_D1 = sink.stb,
+                i_D2 = sink.stb,
+                o_Q  = tx_ctl_obuf,
+            ),
+            Instance("OBUF",
+                i_I = tx_ctl_obuf,
+                o_O = pads.tx_ctl,
+            ),
+        ]
+        for i in range(4):
+            self.specials += [
+                Instance("ODDR",
+                    p_DDR_CLK_EDGE = "SAME_EDGE",
+                    i_C  = ClockSignal("eth_tx"),
+                    i_CE = 1,
+                    i_S  = 0,
+                    i_R  = 0,
+                    i_D1 = sink.data[i],
+                    i_D2 = sink.data[4+i],
+                    o_Q  = tx_data_obuf[i],
+                ),
+                Instance("OBUF",
+                    i_I = tx_data_obuf[i],
+                    o_O = pads.tx_data[i],
+                )
+            ]
+        self.comb += sink.ack.eq(1)
+
+
+class LiteEthPHYRGMIIRX(Module):
+    def __init__(self, pads, rx_delay=2e-9, iodelay_clk_freq=200e6):
+        self.source = source = stream.Endpoint(eth_phy_layout(8))
+
+        # # #
+
+        assert iodelay_clk_freq in [200e6, 300e6, 400e6]
+        iodelay_tap_average = 1 / (2*32 * iodelay_clk_freq)
+        rx_delay_taps = round(rx_delay / iodelay_tap_average)
+        assert rx_delay_taps < 32, "Exceeded ODELAYE2 max value: {} >= 32".format(rx_delay_taps)
+
+        rx_ctl_ibuf    = Signal()
+        rx_ctl_idelay  = Signal()
+        rx_ctl         = Signal()
+        rx_data_ibuf   = Signal(4)
+        rx_data_idelay = Signal(4)
+        rx_data        = Signal(8)
+
+        self.specials += [
+            Instance("IBUF", i_I=pads.rx_ctl, o_O=rx_ctl_ibuf),
+            Instance("IDELAYE2",
+                p_IDELAY_TYPE  = "FIXED",
+                p_IDELAY_VALUE = rx_delay_taps,
+                p_REFCLK_FREQUENCY = iodelay_clk_freq/1e6,
+                i_C        = 0,
+                i_LD       = 0,
+                i_CE       = 0,
+                i_LDPIPEEN = 0,
+                i_INC      = 0,
+                i_IDATAIN  = rx_ctl_ibuf,
+                o_DATAOUT  = rx_ctl_idelay,
+            ),
+            Instance("IDDR",
+                p_DDR_CLK_EDGE = "SAME_EDGE_PIPELINED",
+                i_C  = ClockSignal("eth_rx"),
+                i_CE = 1,
+                i_S  = 0,
+                i_R  = 0,
+                i_D  = rx_ctl_idelay,
+                o_Q1 = rx_ctl,
+                o_Q2 = Signal(),
+            )
+        ]
+        for i in range(4):
+            self.specials += [
+                Instance("IBUF",
+                    i_I = pads.rx_data[i],
+                    o_O = rx_data_ibuf[i],
+                ),
+                Instance("IDELAYE2",
+                    p_IDELAY_TYPE  = "FIXED",
+                    p_IDELAY_VALUE = rx_delay_taps,
+                    p_REFCLK_FREQUENCY = iodelay_clk_freq/1e6,
+                    i_C        = 0,
+                    i_LD       = 0,
+                    i_CE       = 0,
+                    i_LDPIPEEN = 0,
+                    i_INC      = 0,
+                    i_IDATAIN  = rx_data_ibuf[i],
+                    o_DATAOUT  = rx_data_idelay[i],
+                ),
+                Instance("IDDR",
+                    p_DDR_CLK_EDGE = "SAME_EDGE_PIPELINED",
+                    i_C  = ClockSignal("eth_rx"),
+                    i_CE = 1,
+                    i_S  = 0,
+                    i_R  = 0,
+                    i_D  = rx_data_idelay[i],
+                    o_Q1 = rx_data[i],
+                    o_Q2 = rx_data[i+4],
+                )
+            ]
+
+        rx_ctl_d = Signal()
+        self.sync += rx_ctl_d.eq(rx_ctl)
+
+        last = Signal()
+        self.comb += last.eq(~rx_ctl & rx_ctl_d)
+        self.sync += [
+            source.stb.eq(rx_ctl),
+            source.data.eq(rx_data)
+        ]
+        self.comb += source.eop.eq(last)
+
+
+class LiteEthPHYRGMIICRG(Module, AutoCSR):
+    def __init__(self, clock_pads, pads, with_hw_init_reset, tx_delay=2e-9, hw_reset_cycles=256):
+        self._reset = CSRStorage()
+
+        # # #
+
+        # RX clock
+        self.clock_domains.cd_eth_rx = ClockDomain()
+        eth_rx_clk_ibuf = Signal()
+        self.specials += [
+            Instance("IBUF",
+                i_I = clock_pads.rx,
+                o_O = eth_rx_clk_ibuf,
+            ),
+            Instance("BUFG",
+                i_I = eth_rx_clk_ibuf,
+                o_O = self.cd_eth_rx.clk,
+            ),
+        ]
+
+        # TX clock
+        self.clock_domains.cd_eth_tx         = ClockDomain()
+        self.clock_domains.cd_eth_tx_delayed = ClockDomain(reset_less=True)
+        tx_phase = 125e6*tx_delay*360
+        assert tx_phase < 360
+        pll_fb = Signal()
+        eth_tx_clk = Signal()
+        eth_tx_delayed_clk = Signal()
+        self.specials += [
+            Instance("PLLE2_BASE",
+                     p_STARTUP_WAIT="FALSE", o_LOCKED=Signal(),
+
+                     # VCO @ 1GHz
+                     p_REF_JITTER1=0.01, p_CLKIN1_PERIOD=5.0,
+                     p_CLKFBOUT_MULT=8, p_DIVCLK_DIVIDE=1,
+                     i_CLKIN1=ClockSignal("eth_rx"), i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb,
+
+                     # 125MHz
+                     p_CLKOUT0_DIVIDE=8, p_CLKOUT0_PHASE=0.0, o_CLKOUT0=eth_tx_clk,
+
+                     # 500MHz
+                     p_CLKOUT1_DIVIDE=8, p_CLKOUT1_PHASE=tx_phase, o_CLKOUT1=eth_tx_delayed_clk,
+
+                     p_CLKOUT2_DIVIDE=5, p_CLKOUT2_PHASE=0.0, #o_CLKOUT2=,
+                     p_CLKOUT3_DIVIDE=5, p_CLKOUT3_PHASE=0.0, #o_CLKOUT3=,
+                     p_CLKOUT4_DIVIDE=5, p_CLKOUT4_PHASE=0.0, #o_CLKOUT4=
+            ),
+            Instance("BUFG", i_I=eth_tx_clk, o_O=self.cd_eth_tx.clk),
+            Instance("BUFG", i_I=eth_tx_delayed_clk, o_O=self.cd_eth_tx_delayed.clk),
+        ]
+
+        eth_tx_clk_obuf = Signal()
+        self.specials += [
+            Instance("ODDR",
+                p_DDR_CLK_EDGE = "SAME_EDGE",
+                i_C  = ClockSignal("eth_tx_delayed"),
+                i_CE = 1,
+                i_S  = 0,
+                i_R  = 0,
+                i_D1 = 1,
+                i_D2 = 0,
+                o_Q  = eth_tx_clk_obuf,
+            ),
+            Instance("OBUF",
+                i_I = eth_tx_clk_obuf,
+                o_O = clock_pads.tx,
+            )
+        ]
+
+        # Reset
+        self.reset = reset = Signal()
+        if with_hw_init_reset:
+            self.submodules.hw_reset = LiteEthPHYHWReset(cycles=hw_reset_cycles)
+            self.comb += reset.eq(self._reset.storage | self.hw_reset.reset)
+        else:
+            self.comb += reset.eq(self._reset.storage)
+        if hasattr(pads, "rst_n"):
+            self.comb += pads.rst_n.eq(~reset)
+        self.specials += [
+            AsyncResetSynchronizer(self.cd_eth_tx, reset),
+            AsyncResetSynchronizer(self.cd_eth_rx, reset),
+        ]
+
+
+class LiteEthPHYRGMII(Module, AutoCSR):
+    dw          = 8
+    tx_clk_freq = 125e6
+    rx_clk_freq = 125e6
+    def __init__(self, clock_pads, pads, with_hw_init_reset=True, tx_delay=2e-9, rx_delay=2e-9,
+            iodelay_clk_freq=200e6, hw_reset_cycles=256):
+        self.submodules.crg = LiteEthPHYRGMIICRG(clock_pads, pads, with_hw_init_reset, tx_delay, hw_reset_cycles)
+        self.submodules.tx  = ClockDomainsRenamer("eth_tx")(LiteEthPHYRGMIITX(pads))
+        self.submodules.rx  = ClockDomainsRenamer("eth_rx")(LiteEthPHYRGMIIRX(pads, rx_delay, iodelay_clk_freq))
+        self.sink, self.source = self.tx.sink, self.rx.source
diff --git a/misoc/cores/spi_flash.py b/misoc/cores/spi_flash.py
@@ -40,7 +40,10 @@ def __init__(self, pads, dummy=15, div=2, with_bitbang=True, endianness="big", d
         """
         adr_width = 32-log2_int(dw//8)
         self.bus = bus = wishbone.Interface(data_width=dw, adr_width=adr_width)
-        spi_width = len(pads.dq)
+        if hasattr(pads, "dq"):
+            spi_width = len(pads.dq)
+        else:
+            spi_width = 1
         if with_bitbang:
             self.bitbang = CSRStorage(4)
             self.miso = CSRStatus()
@@ -62,8 +65,16 @@ def __init__(self, pads, dummy=15, div=2, with_bitbang=True, endianness="big", d
 
         pads.cs_n.reset = 1
 
-        dq = TSTriple(spi_width)
-        self.specials.dq = dq.get_tristate(pads.dq)
+        if spi_width > 1:
+            dq = TSTriple(spi_width)
+            self.specials.dq = dq.get_tristate(pads.dq)
+        else:
+            class TripleMock:
+                def __init__(self):
+                    self.i = pads.miso
+                    self.o = pads.mosi
+                    self.oe = Signal()
+            dq = TripleMock()
 
         sr = Signal(max(cmd_width, addr_width, dw))
         if endianness == "big":
@@ -88,7 +99,8 @@ def __init__(self, pads, dummy=15, div=2, with_bitbang=True, endianness="big", d
                     dq.oe.eq(1)
                 ),
                 If(self.bitbang.storage[1],
-                    self.miso.status.eq(dq.i[1])
+                    self.miso.status.eq(dq.i) if spi_width == 1 \
+                        else self.miso.status.eq(dq.i[1])
                 )
             ]
             if spi_width > 1:
diff --git a/misoc/targets/digilent_genesys2.py b/misoc/targets/digilent_genesys2.py
