diff --git a/common/g45/hw-gfx-gma-gmch-dp.ads b/common/g45/hw-gfx-gma-gmch-dp.ads
new file mode 100644
index 0000000..a99b603
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+++ b/common/g45/hw-gfx-gma-gmch-dp.ads
@@ -0,0 +1,28 @@
+--
+-- Copyright (C) 2016 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; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- 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.
+--
+
+package HW.GFX.GMA.GMCH.DP
+is
+
+   procedure On
+     (Port_Cfg : in     Port_Config;
+      Pipe     : in     Pipe_Index;
+      Success  :    out Boolean)
+   with
+      Pre => Port_Cfg.Port in GMCH_DP_Port;
+
+   procedure Off (Port : GMCH_DP_Port);
+   procedure All_Off;
+
+end HW.GFX.GMA.GMCH.DP;