--
-- Copyright (C) 2015-2018 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.
--

private package HW.GFX.GMA.Config is

   Gen : constant Generation := <<GEN>>;

   CPU_First : constant CPU_Type :=
     (case Gen is
         when G45       => G45,
         when Ironlake  => Ironlake,
         when Haswell   => Haswell,
         when Broxton   => Broxton,
         when Skylake   => Skylake);
   CPU_Last : constant CPU_Type :=
     (case Gen is
         when G45       => G45,
         when Ironlake  => Ivybridge,
         when Haswell   => Broadwell,
         when Broxton   => Broxton,
         when Skylake   => Skylake);
   CPU_Var_Last : constant CPU_Variant :=
     (case Gen is
         when Haswell | Skylake  => ULT,
         when others             => Normal);
   subtype Gen_CPU_Type is CPU_Type range CPU_First .. CPU_Last;
   subtype Gen_CPU_Variant is CPU_Variant range Normal .. CPU_Var_Last;

   CPU : constant Gen_CPU_Type := <<CPU>>;

   CPU_Var : constant Gen_CPU_Variant := <<CPU_VARIANT>>;

   Internal_Display : constant Internal_Type := <<INTERNAL_PORT>>;

   Analog_I2C_Port : constant PCH_Port := <<ANALOG_I2C_PORT>>;

   EDP_Low_Voltage_Swing : constant Boolean := False;

   DDI_HDMI_Buffer_Translation : constant Integer := -1;

   Default_MMIO_Base : constant := <<DEFAULT_MMIO_BASE>>;

   LVDS_Dual_Threshold : constant := 95_000_000;

   ----------------------------------------------------------------------------

   type Valid_Port_Array is array (Port_Type) of Boolean;
   type Variable_Config is record
      Valid_Port     : Valid_Port_Array;
      Raw_Clock      : Frequency_Type;
   end record;

   Initial_Settings : constant Variable_Config :=
     (Valid_Port     => (others => False),
      Raw_Clock      => Frequency_Type'First);

   Variable : Variable_Config with Part_Of => GMA.Config_State;

   Valid_Port  : Valid_Port_Array renames Variable.Valid_Port;
   Raw_Clock   : Frequency_Type renames Variable.Raw_Clock;

   ----------------------------------------------------------------------------

   Gen_G45           : constant Boolean := Gen = G45;
   Gen_Ironlake      : constant Boolean := Gen = Ironlake;
   Gen_Haswell       : constant Boolean := Gen = Haswell;
   Gen_Broxton       : constant Boolean := Gen = Broxton;
   Gen_Skylake       : constant Boolean := Gen = Skylake;

   Up_To_Ironlake    : constant Boolean := Gen <= Ironlake;
   Ironlake_On       : constant Boolean := Gen >= Ironlake;
   Haswell_On        : constant Boolean := Gen >= Haswell;
   Broxton_On        : constant Boolean := Gen >= Broxton;
   Skylake_On        : constant Boolean := Gen >= Skylake;

   CPU_Ironlake      : constant Boolean := Gen_Ironlake and then CPU = Ironlake;
   CPU_Sandybridge   : constant Boolean := Gen_Ironlake and then CPU = Sandybridge;
   CPU_Ivybridge     : constant Boolean := Gen_Ironlake and then CPU = Ivybridge;
   CPU_Haswell       : constant Boolean := Gen_Haswell and then CPU = Haswell;
   CPU_Broadwell     : constant Boolean := Gen_Haswell and then CPU = Broadwell;

   Sandybridge_On    : constant Boolean :=
     ((Gen_Ironlake and then CPU >= Sandybridge) or Haswell_On);
   Ivybridge_On      : constant Boolean :=
     ((Gen_Ironlake and then CPU >= Ivybridge) or Haswell_On);
   Broadwell_On      : constant Boolean :=
     ((Gen_Haswell and then CPU >= Broadwell) or Broxton_On);

   ----------------------------------------------------------------------------

   Have_HDMI_Buf_Override  : constant Boolean := DDI_HDMI_Buffer_Translation >= 0;
   Default_MMIO_Base_Set   : constant Boolean := Default_MMIO_Base /= 0;

   Has_Internal_Display    : constant Boolean := Internal_Display /= None;
   Internal_Is_LVDS        : constant Boolean := Internal_Display = LVDS;
   Internal_Is_EDP         : constant Boolean := Internal_Display = DP;
   Have_DVI_I              : constant Boolean := Analog_I2C_Port /= PCH_DAC;
   Has_Presence_Straps     : constant Boolean := not Gen_Broxton;
   Is_ULT                  : constant Boolean :=
     ((Gen_Haswell or Gen_Skylake) and then CPU_Var = ULT);

   ----- CPU pipe: --------
   Has_Tertiary_Pipe       : constant Boolean := Ivybridge_On;
   Disable_Trickle_Feed    : constant Boolean := not Gen_Haswell;
   Pipe_Enabled_Workaround : constant Boolean := CPU_Broadwell;
   Has_EDP_Transcoder      : constant Boolean := Haswell_On;
   Use_PDW_For_EDP_Scaling : constant Boolean := CPU_Haswell;
   Has_Pipe_DDI_Func       : constant Boolean := Haswell_On;
   Has_Trans_Clk_Sel       : constant Boolean := Haswell_On;
   Has_Pipe_MSA_Misc       : constant Boolean := Haswell_On;
   Has_Pipeconf_Misc       : constant Boolean := Broadwell_On;
   Has_Pipeconf_BPC        : constant Boolean := not CPU_Haswell;
   Has_Plane_Control       : constant Boolean := Broxton_On;
   Has_DSP_Linoff          : constant Boolean := Up_To_Ironlake;
   Has_PF_Pipe_Select      : constant Boolean := CPU_Ivybridge or CPU_Haswell;
   Has_Cursor_FBC_Control  : constant Boolean := Ivybridge_On;
   VGA_Plane_Workaround    : constant Boolean := CPU_Ivybridge;
   Has_GMCH_DP_Transcoder  : constant Boolean := Gen_G45;
   Has_GMCH_VGACNTRL       : constant Boolean := Gen_G45;
   Has_GMCH_PFIT_CONTROL   : constant Boolean := Gen_G45;

   ----- Panel power: -----
   Has_PP_Write_Protection : constant Boolean := Up_To_Ironlake;
   Has_PP_Port_Select      : constant Boolean := Up_To_Ironlake;
   Use_PP_VDD_Override     : constant Boolean := Up_To_Ironlake;
   Has_PCH_Panel_Power     : constant Boolean := Ironlake_On;

   ----- PCH/FDI: ---------
   Has_PCH                 : constant Boolean := not Gen_Broxton and not Gen_G45;
   Has_PCH_DAC             : constant Boolean :=
     (Gen_Ironlake or (Gen_Haswell and then not Is_ULT));

   Has_PCH_Aux_Channels    : constant Boolean := Gen_Ironlake or Gen_Haswell;

   VGA_Has_Sync_Disable    : constant Boolean := Up_To_Ironlake;

   Has_Trans_Timing_Ovrrde : constant Boolean := Sandybridge_On;

   Has_DPLL_SEL            : constant Boolean := Gen_Ironlake;
   Has_FDI_BPC             : constant Boolean := Gen_Ironlake;
   Has_FDI_Composite_Sel   : constant Boolean := CPU_Ivybridge;
   Has_New_FDI_Sink        : constant Boolean := Sandybridge_On;
   Has_New_FDI_Source      : constant Boolean := Ivybridge_On;
   Has_Trans_DP_Ctl        : constant Boolean := CPU_Sandybridge or CPU_Ivybridge;
   Has_FDI_C               : constant Boolean := CPU_Ivybridge;

   Has_FDI_RX_Power_Down   : constant Boolean := Gen_Haswell;

   Has_GMCH_RawClk         : constant Boolean := Gen_G45;

   ----- DDI: -------------
   End_EDP_Training_Late   : constant Boolean := Gen_Haswell;
   Has_Per_DDI_Clock_Sel   : constant Boolean := Gen_Haswell;
   Has_HOTPLUG_CTL         : constant Boolean := Gen_Haswell;
   Has_SHOTPLUG_CTL_A      : constant Boolean :=
     ((Gen_Haswell and then Is_ULT) or Skylake_On);

   Has_DDI_PHYs            : constant Boolean := Gen_Broxton;

   Has_DDI_D               : constant Boolean :=
     ((Gen_Haswell or Gen_Skylake) and then not Is_ULT);
   Has_DDI_E               : constant Boolean := -- might be disabled by x4 eDP
                                                 Has_DDI_D;

   Has_DDI_Buffer_Trans    : constant Boolean := Haswell_On and
                                                 not Gen_Broxton;
   Has_Low_Voltage_Swing   : constant Boolean := Broxton_On;
   Has_Iboost_Config       : constant Boolean := Skylake_On;

   Need_DP_Aux_Mutex       : constant Boolean := False; -- Skylake & (PSR | GTC)

   ----- GMBUS: -----------
   Ungate_GMBUS_Unit_Level : constant Boolean := Skylake_On;
   GMBUS_Alternative_Pins  : constant Boolean := Gen_Broxton;
   Has_PCH_GMBUS           : constant Boolean := Ironlake_On;

   ----- Power: -----------
   Has_IPS                 : constant Boolean :=
     (Gen_Haswell and then
      ((CPU_Haswell and Is_ULT) or CPU_Broadwell));
   Has_IPS_CTL_Mailbox     : constant Boolean := CPU_Broadwell;

   Has_Per_Pipe_SRD        : constant Boolean := Broadwell_On;

   ----- GTT: -------------
   Has_64bit_GTT           : constant Boolean := Broadwell_On;

   ----------------------------------------------------------------------------

   Max_Pipe : constant Pipe_Index :=
     (if Has_Tertiary_Pipe then Tertiary else Secondary);

   Last_Digital_Port : constant Digital_Port :=
     (if Has_DDI_E then DIGI_E else DIGI_C);

   ----------------------------------------------------------------------------

   type FDI_Per_Port is array (Port_Type) of Boolean;
   Is_FDI_Port : constant FDI_Per_Port :=
     (Disabled       => False,
      Internal       => Gen_Ironlake and Internal_Is_LVDS,
      DP1 .. HDMI3   => Gen_Ironlake,
      Analog         => Has_PCH_DAC);

   type FDI_Lanes_Per_Port is array (GPU_Port) of DP_Lane_Count;
   FDI_Lane_Count : constant FDI_Lanes_Per_Port :=
     (DIGI_D => DP_Lane_Count_2,
      others => (if Gen_Ironlake then DP_Lane_Count_4 else DP_Lane_Count_2));

   FDI_Training : constant FDI_Training_Type :=
     (if    CPU_Ironlake      then Simple_Training
      elsif CPU_Sandybridge   then Full_Training
                              else Auto_Training);

   ----------------------------------------------------------------------------

   Default_DDI_HDMI_Buffer_Translation : constant DDI_HDMI_Buf_Trans_Range :=
     (if    CPU_Haswell    then 6
      elsif CPU_Broadwell  then 7
      elsif Broxton_On     then 8
                           else 0);

   ----------------------------------------------------------------------------

   Default_CDClk_Freq : constant Frequency_Type :=
     (if    Gen_G45                          then 320_000_000  -- unused
      elsif CPU_Ironlake or Gen_Haswell      then 450_000_000
      elsif CPU_Sandybridge or CPU_Ivybridge then 400_000_000
      elsif Gen_Broxton                      then 288_000_000
      elsif Gen_Skylake                      then 337_500_000
                                             else Frequency_Type'First);

   Default_RawClk_Freq : constant Frequency_Type :=
     (if    Gen_G45        then 100_000_000  -- unused, depends on FSB
      elsif Gen_Ironlake   then 125_000_000
      elsif Gen_Haswell    then (if Is_ULT then 24_000_000 else 125_000_000)
      elsif Gen_Broxton    then Frequency_Type'First  -- none needed
      elsif Gen_Skylake    then 24_000_000
                           else Frequency_Type'First);

   ----------------------------------------------------------------------------

   -- Maximum source width with enabled scaler. This only accounts
   -- for simple 1:1 pipe:scaler mappings.

   type Width_Per_Pipe is array (Pipe_Index) of Width_Type;

   Maximum_Scalable_Width : constant Width_Per_Pipe :=
     (if Gen_G45 then   -- TODO: Is this true?
        (Primary     => 4096,
         Secondary   => 2048,
         Tertiary    => Pos32'First)
      elsif Gen_Ironlake or CPU_Haswell then
        (Primary     => 4096,
         Secondary   => 2048,
         Tertiary    => 2048)
      else
        (Primary     => 4096,
         Secondary   => 4096,
         Tertiary    => 4096));

   -- Maximum X position of hardware cursors
   Maximum_Cursor_X : constant := (case Gen is
                                    when G45 .. Ironlake       => 4095,
                                    when Haswell .. Skylake    => 8191);

   Maximum_Cursor_Y : constant := 4095;

   ----------------------------------------------------------------------------

   -- FIXME: Unknown for Broxton, Linux' i915 contains a fixme too :-D
   HDMI_Max_Clock_24bpp : constant Frequency_Type :=
     (if Haswell_On then 300_000_000 else 225_000_000);

   ----------------------------------------------------------------------------

   GTT_PTE_Size : constant := (if Has_64bit_GTT then 8 else 4);

   Fence_Base : constant :=
     (if not Sandybridge_On then 16#0000_3000# else 16#0010_0000#);

   Fence_Count : constant :=
     (if not Ivybridge_On then 16 else 32);

   ----------------------------------------------------------------------------

   use type HW.Word16;

   function Is_Broadwell_H (Device_Id : Word16) return Boolean is
     (Device_Id = 16#1612# or Device_Id = 16#1622# or Device_Id = 16#162a#);

   function Is_Skylake_U (Device_Id : Word16) return Boolean is
     (Device_Id = 16#1906# or Device_Id = 16#1916# or Device_Id = 16#1923# or
      Device_Id = 16#1926# or Device_Id = 16#1927#);

   -- Rather catch too much here than too little,
   -- it's only used to distinguish generations.
   function Is_GPU (Device_Id : Word16; CPU : CPU_Type; CPU_Var : CPU_Variant)
      return Boolean is
     (case CPU is
         when G45          => (Device_Id and 16#ff02#) = 16#2e02# or
                              (Device_Id and 16#fffe#) = 16#2a42#,
         when Ironlake     => (Device_Id and 16#fff3#) = 16#0042#,
         when Sandybridge  => (Device_Id and 16#ffc2#) = 16#0102#,
         when Ivybridge    => (Device_Id and 16#ffc3#) = 16#0142#,
         when Haswell =>
           (case CPU_Var is
               when Normal => (Device_Id and 16#ffc3#) = 16#0402# or
                              (Device_Id and 16#ffc3#) = 16#0d02#,
               when ULT    => (Device_Id and 16#ffc3#) = 16#0a02#),
         when Broadwell    => ((Device_Id and 16#ffc3#) = 16#1602# or
                               (Device_Id and 16#ffcf#) = 16#160b# or
                               (Device_Id and 16#ffcf#) = 16#160d#) and
                             (case CPU_Var is
                                 when Normal =>     Is_Broadwell_H (Device_Id),
                                 when ULT    => not Is_Broadwell_H (Device_Id)),
         when Broxton      => (Device_Id and 16#fffe#) = 16#5a84#,
         when Skylake      => ((Device_Id and 16#ffc3#) = 16#1902# or
                               (Device_Id and 16#ffcf#) = 16#190b# or
                               (Device_Id and 16#ffcf#) = 16#190d# or
                               (Device_Id and 16#fff9#) = 16#1921#) and
                             (case CPU_Var is
                                 when Normal => not Is_Skylake_U (Device_Id),
                                 when ULT    =>     Is_Skylake_U (Device_Id)));

   function Compatible_GPU (Device_Id : Word16) return Boolean is
     (Is_GPU (Device_Id, CPU, CPU_Var));

end HW.GFX.GMA.Config;