cyclonev: Outline functions for creating bels/wires/pips

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

cyclonev/arch.cc

@@ -261,6 +261,66 @@ bool Arch::pack() { return true; }
 bool Arch::place() { return true; }
 bool Arch::route() { return true; }
 
+BelId Arch::add_bel(int x, int y, IdString name, IdString type, IdString bucket)
+{
+    // TODO: nothing else is using this BelId system yet...
+    // TODO (tomorrow?): we probably want a belsByTile type arrangement, similar for wires and pips, for better spacial
+    // locality
+    int z = 0;
+    BelId id;
+    // Determine a unique z-coordinate
+    while (bels.count(id = BelId(CycloneV::xy2pos(x, y), z)))
+        z++;
+    auto &bel = bels[id];
+    bel.name = name;
+    bel.type = type;
+    bel.bucket = bucket;
+    return id;
+}
+
+WireId Arch::add_wire(int x, int y, IdString name, uint64_t flags)
+{
+    std::array<IdString, 4> ids{
+            id_WIRE,
+            int2id.at(x),
+            int2id.at(y),
+            name,
+    };
+    IdStringList full_name(ids);
+    auto existing = npnr_wirebyname.find(full_name);
+    if (existing != npnr_wirebyname.end()) {
+        // Already exists, don't create anything
+        return existing->second;
+    } else {
+        // Determine a unique ID for the wire
+        int z = 0;
+        WireId id;
+        while (wires.count(id = WireId(CycloneV::rnode(CycloneV::rnode_type_t((z >> 10) + 128), x, y, (z & 0x3FF)))))
+            z++;
+        wires[id].name_override = name;
+        wires[id].flags = flags;
+        return id;
+    }
+}
+
+PipId Arch::add_pip(WireId src, WireId dst)
+{
+    wires[src].wires_downhill.push_back(dst);
+    wires[dst].wires_uphill.push_back(src);
+    return PipId(src.node, dst.node);
+}
+
+void Arch::add_bel_pin(BelId bel, IdString pin, PortType dir, WireId wire)
+{
+    bels[bel].pins[pin].dir = dir;
+    bels[bel].pins[pin].wire = wire;
+
+    BelPin bel_pin;
+    bel_pin.bel = bel;
+    bel_pin.pin = pin;
+    wires[wire].bel_pins.push_back(bel_pin);
+}
+
 #ifdef WITH_HEAP
 const std::string Arch::defaultPlacer = "heap";
 #else

cyclonev/arch.h

@@ -37,16 +37,45 @@ struct ArchArgs
     std::string mistral_root;
 };
 
+// These structures are used for fast ALM validity checking
+struct ALMInfo
+{
+    // Pointers to bels
+    std::array<BelId, 2> lut_bels;
+    std::array<BelId, 4> ff_bels;
+    // TODO: ALM configuration (L5/L6 mode, LUT input permutation, etc)
+};
+
+struct LABInfo
+{
+    std::array<ALMInfo, 10> alms;
+    // TODO: LAB configuration (control set etc)
+};
+
 struct PinInfo
 {
-    IdString name;
     WireId wire;
-    PortType type;
+    PortType dir;
 };
 
 struct BelInfo
 {
-    // TODO
+    IdString name;
+    IdString type;
+    IdString bucket;
+    int z;
+    std::unordered_map<IdString, PinInfo> pins;
+    // Info for different kinds of bels
+    union
+    {
+        // This enables fast lookup of the associated ALM, etc
+        struct
+        {
+            uint32_t lab; // index into the list of LABs
+            uint8_t alm;  // ALM index inside LAB
+            uint8_t idx;  // LUT or FF index inside ALM
+        } labData;
+    };
 };
 
 // We maintain our own wire data based on mistral's. This gets us the bidirectional linking that nextpnr needs,
@@ -272,6 +301,18 @@ struct Arch : BaseArch<ArchRanges>
     bool place() override;
     bool route() override;
 
+    // -------------------------------------------------
+    // Functions for device setup
+
+    BelId add_bel(int x, int y, IdString name, IdString type, IdString bucket);
+    WireId add_wire(int x, int y, IdString name, uint64_t flags = 0);
+    PipId add_pip(WireId src, WireId dst);
+
+    void add_bel_pin(BelId bel, IdString pin, PortType dir, WireId wire);
+
+    void create_lab(int x, int y);
+    void create_gpio(int x, int y);
+
     // -------------------------------------------------
 
     static const std::string defaultPlacer;