cyclonev: Add validity check and IO bels

Signed-off-by: gatecat <gatecat@ds0.me>

cyclonev/arch.cc

@@ -67,8 +67,7 @@ Arch::Arch(ArchArgs args)
                     create_lab(x, y);
                     break;
                 case CycloneV::block_type_t::GPIO:
-                    // GPIO tiles contain 4 pins
+                    create_gpio(x, y);
-                    // TODO
                     break;
                 default:
                     continue;
@@ -137,6 +136,18 @@ IdStringList Arch::getBelName(BelId bel) const
     return IdStringList(ids);
 }
 
+bool Arch::isBelLocationValid(BelId bel) const
+{
+    auto &data = bel_data(bel);
+    // Incremental validity update
+    if (data.type == id_MISTRAL_COMB) {
+        return is_alm_legal(data.lab_data.lab, data.lab_data.alm);
+    } else if (data.type == id_MISTRAL_FF) {
+        return is_alm_legal(data.lab_data.lab, data.lab_data.alm) && is_lab_ctrlset_legal(data.lab_data.lab);
+    }
+    return true;
+}
+
 WireId Arch::getWireByName(IdStringList name) const
 {
     // non-mistral wires
@@ -217,6 +228,8 @@ bool Arch::isValidBelForCellType(IdString cell_type, BelId bel) const
     IdString bel_type = getBelType(bel);
     if (bel_type == id_MISTRAL_COMB)
         return is_comb_cell(cell_type);
+    else if (bel_type == id_MISTRAL_IO)
+        return is_io_cell(cell_type);
     else
         return bel_type == cell_type;
 }
@@ -225,6 +238,8 @@ BelBucketId Arch::getBelBucketForCellType(IdString cell_type) const
 {
     if (is_comb_cell(cell_type))
         return id_MISTRAL_COMB;
+    else if (is_io_cell(cell_type))
+        return id_MISTRAL_IO;
     else
         return cell_type;
 }

cyclonev/arch.h

@@ -44,8 +44,6 @@ struct ALMInfo
     std::array<BelId, 2> lut_bels;
     std::array<BelId, 4> ff_bels;
     // TODO: ALM configuration (L5/L6 mode, LUT input permutation, etc)
-    // So we only validity-check changed parts
-    bool valid = false, dirty = false;
 };
 
 struct LABInfo
@@ -56,9 +54,6 @@ struct LABInfo
     std::array<WireId, 2> aclr_wires;
     WireId sclr_wire, sload_wire;
     // TODO: LAB configuration (control set etc)
-
-    // These apply to the validity-checking status of the shared FF control sets
-    bool ctrl_valid = false, ctrl_dirty = false;
 };
 
 struct PinInfo
@@ -278,6 +273,8 @@ struct Arch : BaseArch<ArchRanges>
     PortType getBelPinType(BelId bel, IdString pin) const override { return bel_data(bel).pins.at(pin).dir; }
     std::vector<IdString> getBelPins(BelId bel) const override;
 
+    bool isBelLocationValid(BelId bel) const override;
+
     // -------------------------------------------------
 
     WireId getWireByName(IdStringList name) const override;
@@ -341,8 +338,8 @@ struct Arch : BaseArch<ArchRanges>
         return WireId(cyclonev->pnode_to_rnode(CycloneV::pnode(bt, x, y, port, bi, pi)));
     }
 
-    void create_lab(int x, int y); // lab.cc
+    void create_lab(int x, int y);  // lab.cc
-    void create_gpio(int x, int y);
+    void create_gpio(int x, int y); // io.cc
 
     // -------------------------------------------------
 
@@ -355,6 +352,10 @@ struct Arch : BaseArch<ArchRanges>
 
     // -------------------------------------------------
 
+    bool is_io_cell(IdString cell_type) const; // io.cc
+
+    // -------------------------------------------------
+
     static const std::string defaultPlacer;
     static const std::vector<std::string> availablePlacers;
     static const std::string defaultRouter;

cyclonev/constids.inc

@@ -3,6 +3,14 @@ X(MISTRAL_FF)
 X(LAB)
 X(MLAB)
 
+X(MISTRAL_IO)
+X(I)
+X(O)
+X(OE)
+X(PAD)
+X(MISTRAL_IB)
+X(MISTRAL_OB)
+
 X(A)
 X(B)
 X(C)

cyclonev/io.cc

@@ -0,0 +1,53 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2021  gatecat <gatecat@ds0.me>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "log.h"
+#include "nextpnr.h"
+#include "util.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+void Arch::create_gpio(int x, int y)
+{
+    for (int z = 0; z < 4; z++) {
+        // Notional pad wire
+        WireId pad = add_wire(x, y, id(stringf("PAD[%d]", z)));
+        BelId bel = add_bel(x, y, id(stringf("IO[%d]", z)), id_MISTRAL_IO);
+        add_bel_pin(bel, id_PAD, PORT_INOUT, pad);
+        // FIXME: is the port index of zero always correct?
+        add_bel_pin(bel, id_I, PORT_IN, get_port(CycloneV::GPIO, x, y, z, CycloneV::DATAIN, 0));
+        add_bel_pin(bel, id_OE, PORT_IN, get_port(CycloneV::GPIO, x, y, z, CycloneV::OEIN, 0));
+        add_bel_pin(bel, id_O, PORT_OUT, get_port(CycloneV::GPIO, x, y, z, CycloneV::DATAOUT, 0));
+    }
+}
+
+bool Arch::is_io_cell(IdString cell_type) const
+{
+    // Return true if a cell is an IO buffer cell type
+    switch (cell_type.index) {
+    case ID_MISTRAL_IB:
+    case ID_MISTRAL_OB:
+    case ID_MISTRAL_IO:
+        return true;
+    default:
+        return false;
+    }
+}
+
+NEXTPNR_NAMESPACE_END

cyclonev/lab.cc

@@ -377,4 +377,10 @@ bool Arch::is_alm_legal(uint32_t lab, uint8_t alm) const
     return true;
 }
 
+bool Arch::is_lab_ctrlset_legal(uint32_t lab) const
+{
+    // TODO
+    return true;
+}
+
 NEXTPNR_NAMESPACE_END