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Diffstat (limited to 'hw/xfree86/ramdac/BT.c')
| -rw-r--r-- | hw/xfree86/ramdac/BT.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/hw/xfree86/ramdac/BT.c b/hw/xfree86/ramdac/BT.c new file mode 100644 index 000000000..9ddd3b20b --- /dev/null +++ b/hw/xfree86/ramdac/BT.c @@ -0,0 +1,163 @@ +/* + * 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; + } +} |