| Arthur Heymans | 960e239 | 2026-03-03 19:45:24 +0100 | [diff] [blame] | 1 | -- |
| 2 | -- Copyright (C) 2026 Arthur Heymans <arthur@aheymans.xyz> |
| 3 | -- |
| 4 | -- This program is free software; you can redistribute it and/or modify |
| 5 | -- it under the terms of the GNU General Public License as published by |
| 6 | -- the Free Software Foundation; either version 2 of the License, or |
| 7 | -- (at your option) any later version. |
| 8 | -- |
| 9 | -- This program is distributed in the hope that it will be useful, |
| 10 | -- but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | -- GNU General Public License for more details. |
| 13 | -- |
| 14 | |
| 15 | with HW.GFX.GMA.Config; |
| 16 | with HW.GFX.GMA.Registers; |
| 17 | |
| 18 | with HW.Debug; |
| 19 | with GNAT.Source_Info; |
| 20 | |
| 21 | package body HW.GFX.GMA.GMCH.LVDS is |
| 22 | |
| 23 | LVDS_ENABLE : constant := 1 * 2 ** 31; |
| 24 | LVDS_DITHER_EN : constant := 1 * 2 ** 25; |
| 25 | LVDS_VSYNC_POLARITY_INVERT : constant := 1 * 2 ** 21; |
| 26 | LVDS_HSYNC_POLARITY_INVERT : constant := 1 * 2 ** 20; |
| 27 | LVDS_CLK_A_DATA_A0A2_POWER_MASK : constant := 3 * 2 ** 8; |
| 28 | LVDS_CLK_A_DATA_A0A2_POWER_DOWN : constant := 0 * 2 ** 8; |
| 29 | LVDS_CLK_A_DATA_A0A2_POWER_UP : constant := 3 * 2 ** 8; |
| 30 | LVDS_CLK_B_POWER_MASK : constant := 3 * 2 ** 4; |
| 31 | LVDS_CLK_B_POWER_DOWN : constant := 0 * 2 ** 4; |
| 32 | LVDS_CLK_B_POWER_UP : constant := 3 * 2 ** 4; |
| 33 | LVDS_DATA_B0B2_POWER_MASK : constant := 3 * 2 ** 2; |
| 34 | LVDS_DATA_B0B2_POWER_DOWN : constant := 0 * 2 ** 2; |
| 35 | LVDS_DATA_B0B2_POWER_UP : constant := 3 * 2 ** 2; |
| 36 | |
| 37 | ---------------------------------------------------------------------------- |
| 38 | |
| 39 | procedure On (Port_Cfg : in Port_Config; |
| 40 | Pipe : in Pipe_Index) |
| 41 | is |
| 42 | -- Pre-i965: LVDS encoder can only source from Pipe B (Secondary). |
| 43 | LVDS_Pipe : constant Pipe_Index := |
| 44 | (if Config.LVDS_Needs_Pipe_B then Secondary else Pipe); |
| 45 | |
| 46 | Sync_Polarity : constant Word32 := |
| 47 | (if Port_Cfg.Mode.H_Sync_Active_High then 0 |
| 48 | else LVDS_HSYNC_POLARITY_INVERT) or |
| 49 | (if Port_Cfg.Mode.V_Sync_Active_High then 0 |
| 50 | else LVDS_VSYNC_POLARITY_INVERT); |
| 51 | |
| 52 | Two_Channel : constant Word32 := |
| 53 | (if Port_Cfg.Mode.Dotclock >= Config.LVDS_Dual_Threshold then |
| 54 | LVDS_CLK_B_POWER_UP or LVDS_DATA_B0B2_POWER_UP else 0); |
| 55 | begin |
| 56 | pragma Debug (Debug.Put_Line (GNAT.Source_Info.Enclosing_Entity)); |
| 57 | pragma Debug (Port_Cfg.Mode.BPC /= 6, Debug.Put_Line |
| 58 | ("WARNING: Only 18bpp LVDS mode implemented.")); |
| 59 | pragma Debug (Config.LVDS_Needs_Pipe_B and Pipe /= Secondary, |
| 60 | Debug.Put_Line ("WARNING: Forcing LVDS to Pipe B (pre-i965 requirement).")); |
| 61 | |
| 62 | Registers.Write |
| 63 | (Register => Registers.GMCH_LVDS, |
| 64 | Value => LVDS_ENABLE or |
| 65 | GMCH_PORT_PIPE_SELECT (LVDS_Pipe) or |
| 66 | Sync_Polarity or |
| 67 | LVDS_CLK_A_DATA_A0A2_POWER_UP or |
| 68 | Two_Channel or |
| 69 | LVDS_DITHER_EN); |
| 70 | end On; |
| 71 | |
| 72 | ---------------------------------------------------------------------------- |
| 73 | |
| 74 | procedure Off |
| 75 | is |
| 76 | begin |
| 77 | pragma Debug (Debug.Put_Line (GNAT.Source_Info.Enclosing_Entity)); |
| 78 | |
| 79 | Registers.Write |
| 80 | (Register => Registers.GMCH_LVDS, |
| 81 | Value => LVDS_CLK_A_DATA_A0A2_POWER_DOWN or |
| 82 | LVDS_CLK_B_POWER_DOWN or |
| 83 | LVDS_DATA_B0B2_POWER_DOWN); |
| 84 | end Off; |
| 85 | |
| 86 | end HW.GFX.GMA.GMCH.LVDS; |