Haiku S3 Savage driver adapted from the X.org Savage driver.
Copyright (C) 1994-2000 The XFree86 Project, Inc. All Rights Reserved.
Copyright (c) 2003-2006, X.Org Foundation
Copyright 2007-2008 Haiku, Inc. All rights reserved.
Distributed under the terms of the MIT license.
Authors:
Gerald Zajac 2007-2008
*/
#include "accel.h"
#include "savage.h"
#include <string.h>
#include <ddc.h>
#include <edid.h>
static status_t
GetI2CSignals(void* cookie, int* _clock, int* data)
{
uint32 index = (uint32)(addr_t)cookie;
uint8 value = ReadCrtcReg(index);
*_clock = (value & 0x4) != 0;
*data = (value & 0x8) != 0;
return B_OK;
}
static status_t
SetI2CSignals(void* cookie, int _clock, int data)
{
uint32 index = (uint32)(addr_t)cookie;
uint8 value = 0x10;
if (_clock)
value |= 0x1;
if (data)
value |= 0x2;
WriteCrtcReg(index, value);
return B_OK;
}
bool
Savage_GetEdidInfo(edid1_info& edidInfo)
{
SharedInfo& si = *gInfo.sharedInfo;
uint32 DDCPort = 0;
switch (si.chipType) {
case S3_SAVAGE_3D:
case S3_SAVAGE_MX:
case S3_SUPERSAVAGE:
case S3_SAVAGE2000:
DDCPort = 0xAA;
break;
case S3_SAVAGE4:
case S3_PROSAVAGE:
case S3_TWISTER:
case S3_PROSAVAGE_DDR:
DDCPort = 0xB1;
break;
}
i2c_bus bus;
bus.cookie = (void*)(addr_t)DDCPort;
bus.set_signals = &SetI2CSignals;
bus.get_signals = &GetI2CSignals;
ddc2_init_timing(&bus);
uint8 tmp = ReadCrtcReg(DDCPort);
WriteCrtcReg(DDCPort, tmp | 0x13);
bool bResult = (ddc2_read_edid1(&bus, &edidInfo, NULL, NULL) == B_OK);
WriteCrtcReg(DDCPort, tmp);
return bResult;
}
