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/*
* Copyright 1998 by Alan Hourihane, Wigan, England.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Alan Hourihane not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Alan Hourihane makes no representations
* about the suitability of this software for any purpose. It is provided
* "as is" without express or implied warranty.
*
* ALAN HOURIHANE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL ALAN HOURIHANE BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*
* Authors: Alan Hourihane, <alanh@fairlite.demon.co.uk>
*
* BT RAMDAC routines.
*/
/* $XFree86: xc/programs/Xserver/hw/xfree86/ramdac/BT.c,v 1.7 2000/10/20 12:57:27 alanh Exp $ */
#include "xf86.h"
#include "xf86_OSproc.h"
#include "xf86_ansic.h"
#define INIT_BT_RAMDAC_INFO
#include "BTPriv.h"
#include "xf86RamDacPriv.h"
void
BTramdacRestore(ScrnInfoPtr pScrn, RamDacRecPtr ramdacPtr,
RamDacRegRecPtr ramdacReg)
{
int i;
/* Here we pass a short, so that we can evaluate a mask too */
/* So that the mask is the high byte and the data the low byte */
/* Just the command/status registers */
for (i=0x06;i<0x0A;i++)
(*ramdacPtr->WriteDAC)
(pScrn, i, (ramdacReg->DacRegs[i] & 0xFF00) >> 8,
ramdacReg->DacRegs[i]);
}
void
BTramdacSave(ScrnInfoPtr pScrn, RamDacRecPtr ramdacPtr,
RamDacRegRecPtr ramdacReg)
{
int i;
(*ramdacPtr->ReadAddress)(pScrn, 0); /* Start at index 0 */
for (i=0;i<768;i++)
ramdacReg->DAC[i] = (*ramdacPtr->ReadData)(pScrn);
/* Just the command/status registers */
for (i=0x06;i<0x0A;i++)
ramdacReg->DacRegs[i] = (*ramdacPtr->ReadDAC)(pScrn, i);
}
RamDacHelperRecPtr
BTramdacProbe(ScrnInfoPtr pScrn, RamDacSupportedInfoRecPtr ramdacs/*, RamDacRecPtr ramdacPtr*/)
{
RamDacRecPtr ramdacPtr = RAMDACSCRPTR(pScrn);
Bool RamDacIsSupported = FALSE;
RamDacHelperRecPtr ramdacHelperPtr = NULL;
int BTramdac_ID = -1;
int i, status, cmd0;
/* Save COMMAND Register 0 */
cmd0 = (*ramdacPtr->ReadDAC)(pScrn, BT_COMMAND_REG_0);
/* Ensure were going to access the STATUS Register on next read */
(*ramdacPtr->WriteDAC)(pScrn, BT_COMMAND_REG_0, 0x7F, 0x00);
status = (*ramdacPtr->ReadDAC)(pScrn, BT_STATUS_REG);
switch (status) {
case 0x40:
BTramdac_ID = ATT20C504_RAMDAC;
break;
case 0xD0:
BTramdac_ID = ATT20C505_RAMDAC;
break;
default:
xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
"Unknown BT RAMDAC type (0x%x), assuming BT485\n",
status);
case 0x80:
case 0x90:
case 0xA0:
case 0xB0:
case 0x28: /* This is for the DEC TGA - Questionable ? */
BTramdac_ID = BT485_RAMDAC;
break;
}
/* Restore COMMAND Register 0 */
(*ramdacPtr->WriteDAC)(pScrn, BT_COMMAND_REG_0, 0x00, cmd0);
if (BTramdac_ID == -1) {
xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
"Cannot determine BT RAMDAC type, aborting\n");
return NULL;
} else {
xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
"Attached RAMDAC is %s\n", BTramdacDeviceInfo[BTramdac_ID&0xFFFF]);
}
for (i=0;ramdacs[i].token != -1;i++) {
if (ramdacs[i].token == BTramdac_ID)
RamDacIsSupported = TRUE;
}
if (!RamDacIsSupported) {
xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
"This BT RAMDAC is NOT supported by this driver, aborting\n");
return NULL;
}
ramdacHelperPtr = RamDacHelperCreateInfoRec();
switch(BTramdac_ID) {
case BT485_RAMDAC:
ramdacHelperPtr->SetBpp = BTramdacSetBpp;
break;
}
ramdacPtr->RamDacType = BTramdac_ID;
ramdacHelperPtr->RamDacType = BTramdac_ID;
ramdacHelperPtr->Save = BTramdacSave;
ramdacHelperPtr->Restore = BTramdacRestore;
return ramdacHelperPtr;
}
void
BTramdacSetBpp(ScrnInfoPtr pScrn, RamDacRegRecPtr ramdacReg)
{
/* We need to deal with Direct Colour visuals for 8bpp and other
* good stuff for colours */
switch (pScrn->bitsPerPixel) {
case 32:
ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x10;
break;
case 24:
ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x10;
break;
case 16:
ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x38;
break;
case 15:
ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x30;
break;
case 8:
ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x40;
break;
case 4:
ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x60;
break;
}
}
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