src/add-ons/accelerants/s3/savage_edid.cpp

   1 /*
   2         Haiku S3 Savage driver adapted from the X.org Savage driver.
   3
   4         Copyright (C) 1994-2000 The XFree86 Project, Inc.       All Rights Reserved.
   5         Copyright (c) 2003-2006, X.Org Foundation
   6
   7         Copyright 2007-2008 Haiku, Inc.  All rights reserved.
   8         Distributed under the terms of the MIT license.
   9
  10         Authors:
  11         Gerald Zajac 2007-2008
  12 */
  13
  14 #include "accel.h"
  15 #include "savage.h"
  16
  17 #include <string.h>
  18 #include <ddc.h>
  19 #include <edid.h>
  20
  21
  22
  23 static status_t
  24 GetI2CSignals(void* cookie, int* _clock, int* data)
  25 {
  26         uint32 index = (uint32)cookie;
  27         uint8 value = ReadCrtcReg(index);
  28
  29         *_clock = (value & 0x4) != 0;
  30         *data = (value & 0x8) != 0;
  31         return B_OK;
  32 }
  33
  34
  35 static status_t
  36 SetI2CSignals(void* cookie, int _clock, int data)
  37 {
  38         uint32 index = (uint32)cookie;
  39         uint8 value = 0x10;
  40
  41         if (_clock)
  42                 value |= 0x1;
  43         if (data)
  44                 value |= 0x2;
  45
  46         WriteCrtcReg(index, value);
  47         return B_OK;
  48 }
  49
  50
  51
  52 bool
  53 Savage_GetEdidInfo(edid1_info& edidInfo)
  54 {
  55         // Get the EDID info and return true if successful.
  56
  57         SharedInfo& si = *gInfo.sharedInfo;
  58
  59         uint32 DDCPort = 0;
  60
  61     switch (si.chipType) {
  62         case S3_SAVAGE_3D:
  63         case S3_SAVAGE_MX:
  64         case S3_SUPERSAVAGE:
  65         case S3_SAVAGE2000:
  66                 DDCPort = 0xAA;
  67                 break;
  68
  69         case S3_SAVAGE4:
  70         case S3_PROSAVAGE:
  71         case S3_TWISTER:
  72         case S3_PROSAVAGE_DDR:
  73                 DDCPort = 0xB1;
  74                 break;
  75     }
  76
  77         i2c_bus bus;
  78         bus.cookie = (void*)DDCPort;
  79         bus.set_signals = &SetI2CSignals;
  80         bus.get_signals = &GetI2CSignals;
  81         ddc2_init_timing(&bus);
  82
  83         uint8 tmp = ReadCrtcReg(DDCPort);
  84         WriteCrtcReg(DDCPort, tmp | 0x13);
  85
  86         bool bResult = (ddc2_read_edid1(&bus, &edidInfo, NULL, NULL) == B_OK);
  87         WriteCrtcReg(DDCPort, tmp);
  88
  89         return bResult;
  90 }