Add Partition APIs to ice40, nexus, gowin archs.

Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>

3 files changed, 80 insertions, 2 deletions

diff --git a/nexus/arch.cc b/nexus/arch.cc
index eadfaa4b..659703de 100644
--- a/nexus/arch.cc
+++ b/nexus/arch.cc
@@ -171,6 +171,19 @@ Arch::Arch(ArchArgs args) : args(args)
     }
     if (!speed_grade)
         log_error("Unknown speed grade '%s'.\n", speed.c_str());
+
+    std::unordered_set<IdString> bel_types;
+    for(BelId bel : getBels()) {
+        bel_types.insert(getBelType(bel));
+    }
+
+    for(IdString bel_type : bel_types) {
+        cell_types.push_back(bel_type);
+
+        PartitionId partition;
+        partition.name = bel_type;
+        partitions.push_back(partition);
+    }
 }
 
 // -----------------------------------------------------------------------
@@ -635,8 +648,8 @@ bool Arch::place()
         cfg.ioBufTypes.insert(id_SEIO18_CORE);
         cfg.ioBufTypes.insert(id_OSC_CORE);
         cfg.cellGroups.emplace_back();
-        cfg.cellGroups.back().insert(id_OXIDE_COMB);
-        cfg.cellGroups.back().insert(id_OXIDE_FF);
+        cfg.cellGroups.back().insert({id_OXIDE_COMB});
+        cfg.cellGroups.back().insert({id_OXIDE_FF});
 
         cfg.beta = 0.5;
         cfg.criticalityExponent = 7;
diff --git a/nexus/arch.h b/nexus/arch.h
index 31bfa603..dfd00f90 100644
--- a/nexus/arch.h
+++ b/nexus/arch.h
@@ -1340,6 +1340,46 @@ struct Arch : BaseCtx
         return cell_type == getBelType(bel);
     }
 
+    const std::vector<IdString> &getCellTypes() const {
+        return cell_types;
+    }
+
+    std::vector<PartitionId> getPartitions() const {
+        return partitions;
+    }
+
+    IdString getPartitionName(PartitionId partition) const {
+        return partition.name;
+    }
+
+    PartitionId getPartitionByName(IdString name) const {
+        PartitionId partition;
+        partition.name = name;
+        return partition;
+    }
+
+    PartitionId getPartitionForBel(BelId bel) const {
+        PartitionId partition;
+        partition.name = getBelType(bel);
+        return partition;
+    }
+
+    PartitionId getPartitionForCellType(IdString cell_type) const {
+        PartitionId partition;
+        partition.name = cell_type;
+        return partition;
+    }
+
+    std::vector<BelId> getBelsForPartition(PartitionId partition) const {
+        std::vector<BelId> bels;
+        for(BelId bel : getBels()) {
+            if(getBelType(bel) == partition.name) {
+                bels.push_back(bel);
+            }
+        }
+        return bels;
+    }
+
     // Whether or not a given cell can be placed at a given Bel
     // This is not intended for Bel type checks, but finer-grained constraints
     // such as conflicting set/reset signals, etc
@@ -1541,6 +1581,9 @@ struct Arch : BaseCtx
 
     // -------------------------------------------------
     void write_fasm(std::ostream &out) const;
+
+    std::vector<IdString> cell_types;
+    std::vector<PartitionId> partitions;
 };
 
 NEXTPNR_NAMESPACE_END
diff --git a/nexus/archdefs.h b/nexus/archdefs.h
index adc1342c..12bbd228 100644
--- a/nexus/archdefs.h
+++ b/nexus/archdefs.h
@@ -114,6 +114,17 @@ struct PipId
     }
 };
 
+struct PartitionId {
+    IdString name;
+
+    bool operator==(const PartitionId &other) const { return (name == other.name); }
+    bool operator!=(const PartitionId &other) const { return (name != other.name); }
+    bool operator<(const PartitionId &other) const
+    {
+        return name < other.name;
+    }
+};
+
 struct GroupId
 {
     enum : int8_t
@@ -250,4 +261,15 @@ template <> struct hash<NEXTPNR_NAMESPACE_PREFIX DecalId>
         return seed;
     }
 };
+
+template <> struct hash<NEXTPNR_NAMESPACE_PREFIX PartitionId>
+{
+    std::size_t operator()(const NEXTPNR_NAMESPACE_PREFIX PartitionId &partition) const noexcept
+    {
+        std::size_t seed = 0;
+        boost::hash_combine(seed, hash<NEXTPNR_NAMESPACE_PREFIX IdString>()(partition.name));
+        return seed;
+    }
+};
+
 } // namespace std