diff --git a/common/haswell_shared/hw-gfx-gma-connectors-ddi.ads b/common/haswell_shared/hw-gfx-gma-connectors-ddi.ads
new file mode 100644
index 0000000..337e77b
--- /dev/null
+++ b/common/haswell_shared/hw-gfx-gma-connectors-ddi.ads
@@ -0,0 +1,28 @@
+--
+-- Copyright (C) 2015 secunet Security Networks AG
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; version 2 of the License.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+
+with HW.GFX.GMA.Registers;
+
+private package HW.GFX.GMA.Connectors.DDI
+is
+
+   procedure Pre_On
+     (Port_Cfg : in     Port_Config;
+      PLL_Hint : in     Word32;
+      Success  :    out Boolean);
+
+   procedure Post_On (Port_Cfg : Port_Config);
+
+   procedure Off (Port : Digital_Port);
+
+end HW.GFX.GMA.Connectors.DDI;