Adding stubs for delay annotation and cell timing lookup

Signed-off-by: David Shah <davey1576@gmail.com>

2 files changed, 31 insertions, 0 deletions

diff --git a/ice40/arch.cc b/ice40/arch.cc
index ba372410..380f3386 100644
--- a/ice40/arch.cc
+++ b/ice40/arch.cc
@@ -416,4 +416,25 @@ std::vector<GraphicElement> Arch::getPipGraphics(PipId pip) const
     return ret;
 }
 
+// -----------------------------------------------------------------------
+
+delay_t Arch::getCellDelay(const CellInfo *cell, IdString fromPort,
+                           IdString toPort) const
+{
+    // TODO
+    return 0;
+}
+
+IdString Arch::getPortClock(const CellInfo *cell, IdString port) const
+{
+    // TODO
+    return IdString();
+}
+
+bool Arch::isClockPort(const CellInfo *cell, IdString port) const
+{
+    // TODO
+    return false;
+}
+
 NEXTPNR_NAMESPACE_END
diff --git a/ice40/arch.h b/ice40/arch.h
index c1256a41..172541c0 100644
--- a/ice40/arch.h
+++ b/ice40/arch.h
@@ -755,6 +755,16 @@ struct Arch : BaseCtx
     std::unordered_set<BelId> belGraphicsReload;
     std::unordered_set<WireId> wireGraphicsReload;
     std::unordered_set<PipId> pipGraphicsReload;
+
+    // -------------------------------------------------
+
+    // Get the delay through a cell from one port to another
+    delay_t getCellDelay(const CellInfo *cell, IdString fromPort,
+                         IdString toPort) const;
+    // Get the associated clock to a port, or empty if the port is combinational
+    IdString getPortClock(const CellInfo *cell, IdString port) const;
+    // Return true if a port is a clock
+    bool isClockPort(const CellInfo *cell, IdString port) const;
 };
 
 NEXTPNR_NAMESPACE_END