src/add-ons/accelerants/3dfx/3dfx_edid.cpp

   1 /*
   2  * Copyright 2010 Haiku, Inc.  All rights reserved.
   3  * Distributed under the terms of the MIT license.
   4  *
   5  * Authors:
   6  *              Gerald Zajac
   7  */
   8
   9 #include "accelerant.h"
  10 #include "3dfx.h"
  11
  12 #include <string.h>
  13 #include <ddc.h>
  14 #include <edid.h>
  15
  16
  17
  18 static status_t
  19 GetI2CSignals(void* cookie, int* _clock, int* data)
  20 {
  21         (void)cookie;           // avoid compiler warning for unused arg
  22
  23         uint32 reg = INREG32(VIDEO_SERIAL_PARALLEL_PORT);
  24         *_clock = (reg & VSP_SCL0_IN) ? 1 : 0;;
  25         *data = (reg & VSP_SDA0_IN) ? 1 : 0;
  26         return B_OK;
  27 }
  28
  29
  30 static status_t
  31 SetI2CSignals(void* cookie, int _clock, int data)
  32 {
  33         (void)cookie;           // avoid compiler warning for unused arg
  34
  35         uint32 reg = (INREG32(VIDEO_SERIAL_PARALLEL_PORT)
  36                 & ~(VSP_SDA0_OUT | VSP_SCL0_OUT));
  37         reg = (reg | (_clock ? VSP_SCL0_OUT : 0) | (data ? VSP_SDA0_OUT : 0));
  38         OUTREG32(VIDEO_SERIAL_PARALLEL_PORT, reg);
  39         return B_OK;
  40 }
  41
  42
  43
  44 bool
  45 TDFX_GetEdidInfo(edid1_info& edidInfo)
  46 {
  47         // Get the EDID info and return true if successful.
  48
  49         i2c_bus bus;
  50
  51         bus.cookie = (void*)NULL;
  52         bus.set_signals = &SetI2CSignals;
  53         bus.get_signals = &GetI2CSignals;
  54         ddc2_init_timing(&bus);
  55
  56         uint32 reg = INREG32(VIDEO_SERIAL_PARALLEL_PORT);
  57         OUTREG32(VIDEO_SERIAL_PARALLEL_PORT, reg | VSP_ENABLE_IIC0);
  58
  59         bool bResult = (ddc2_read_edid1(&bus, &edidInfo, NULL, NULL) == B_OK);
  60
  61         OUTREG32(VIDEO_SERIAL_PARALLEL_PORT, reg);
  62
  63         return bResult;
  64 }