Adding stubs for delay annotation and cell timing lookup

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

common/nextpnr.h

@@ -17,13 +17,13 @@
  *
  */
 
+#include <algorithm>
 #include <assert.h>
 #include <stdint.h>
 #include <string>
 #include <unordered_map>
 #include <unordered_set>
 #include <vector>
-#include <algorithm>
 
 #ifndef NEXTPNR_H
 #define NEXTPNR_H
@@ -196,12 +196,12 @@ struct CellInfo;
 
 enum PlaceStrength
 {
-    STRENGTH_NONE   = 0,
+    STRENGTH_NONE = 0,
-    STRENGTH_WEAK   = 1,
+    STRENGTH_WEAK = 1,
     STRENGTH_STRONG = 2,
-    STRENGTH_FIXED  = 3,
+    STRENGTH_FIXED = 3,
     STRENGTH_LOCKED = 4,
-    STRENGTH_USER   = 5
+    STRENGTH_USER = 5
 };
 
 struct PortRef

common/timing.cc

@@ -0,0 +1,29 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  David Shah <david@symbioticeda.com>
+ *
+ *  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 "timing.h"
+#include "log.h"
+#include <unordered_map>
+#include <utility>
+#include <algorithm>
+
+void assign_budget(Context *ctx, float default_clock = 12e6)
+{
+
+}

common/timing.h

@@ -0,0 +1,28 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  David Shah <david@symbioticeda.com>
+ *
+ *  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.
+ *
+ */
+
+#ifndef TIMING_H
+#define TIMING_H
+
+#include "nextpnr.h"
+
+// Assign "budget" values for all user ports in the design
+void assign_budget(Context *ctx, float default_clock = 12e6);
+
+#endif TIMING_H

dummy/arch.cc

@@ -176,4 +176,22 @@ std::vector<GraphicElement> Arch::getPipGraphics(PipId pip) const
     return ret;
 }
 
+// ---------------------------------------------------------------
+
+delay_t Arch::getCellDelay(const CellInfo *cell, IdString fromPort,
+                           IdString toPort) const
+{
+    return 0;
+}
+
+IdString Arch::getPortClock(const CellInfo *cell, IdString port) const
+{
+    return IdString();
+}
+
+bool Arch::isClockPort(const CellInfo *cell, IdString port) const
+{
+    return false;
+}
+
 NEXTPNR_NAMESPACE_END

dummy/arch.h

@@ -32,7 +32,9 @@ struct DelayInfo
     delay_t delay = 0;
 
     delay_t raiseDelay() const { return delay; }
+
     delay_t fallDelay() const { return delay; }
+
     delay_t avgDelay() const { return delay; }
 
     DelayInfo operator+(const DelayInfo &other) const
@@ -131,6 +133,11 @@ struct Arch : BaseCtx
     std::unordered_set<BelId> belGraphicsReload;
     std::unordered_set<WireId> wireGraphicsReload;
     std::unordered_set<PipId> pipGraphicsReload;
+
+    delay_t getCellDelay(const CellInfo *cell, IdString fromPort,
+                         IdString toPort) const;
+    IdString getPortClock(const CellInfo *cell, IdString port) const;
+    bool isClockPort(const CellInfo *cell, IdString port) const;
 };
 
 NEXTPNR_NAMESPACE_END

frontend/json/jsonparse.cc

@@ -26,8 +26,8 @@
 #include <fstream>
 #include <iostream>
 #include <log.h>
-#include <string>
 #include <map>
+#include <string>
 #include "nextpnr.h"
 
 NEXTPNR_NAMESPACE_BEGIN

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

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