atipreinit.c

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             * Graphics PRO TURBO 1600's are unusual in that an ICS2595 is used
             * to generate clocks for VGA modes, and an IBM RGB514 is used for
             * accelerator modes.
             */
            if ((pATI->ProgrammableClock == ATI_CLOCK_ICS2595) &&
                (pATI->DAC == ATI_DAC_IBMRGB514) &&
                (pScreenInfo->depth >= 8) &&
                (pATI->Chipset == ATI_CHIPSET_ATI))
                pATI->ProgrammableClock = ATI_CLOCK_IBMRGB514;

            pATI->ClockDescriptor =
                ATIClockDescriptors[pATI->ProgrammableClock];
        }

        ClockDac = pATI->DAC;
        switch (pATI->ProgrammableClock)
        {
            case ATI_CLOCK_ICS2595:
                /*
                 * Pick up reference divider (43 or 46) appropriate to the chip
                 * revision level.
                 */
                if (ClockTable > 0)
                    pATI->ClockDescriptor.MinM =
                        pATI->ClockDescriptor.MaxM =
                            BIOSWord(ClockTable + 0x0AU);
                else if (!xf86NameCmp(pGDev->clockchip, "ATI 18818-0"))
                    pATI->ClockDescriptor.MinM =
                        pATI->ClockDescriptor.MaxM = 43;
                else if (!xf86NameCmp(pGDev->clockchip, "ATI 18818-1"))
                    pATI->ClockDescriptor.MinM =
                        pATI->ClockDescriptor.MaxM = 46;
                else
                    pATI->ProgrammableClock = ATI_CLOCK_UNKNOWN;
                break;

            case ATI_CLOCK_STG1703:
                /* This one's also a RAMDAC */
                ClockDac = ATI_DAC_STG1703;
                break;

            case ATI_CLOCK_CH8398:
                /* This one's also a RAMDAC */
                ClockDac = ATI_DAC_CH8398;
                break;

            case ATI_CLOCK_INTERNAL:
                /*
                 * The reference divider has already been programmed by BIOS
                 * initialisation.  Because, there is only one reference
                 * divider for all generated frequencies (including MCLK), it
                 * cannot be changed without reprogramming all clocks every
                 * time one of them needs a different reference divider.
                 *
                 * Besides, it's not a good idea to change the reference
                 * divider.  BIOS initialisation sets it to a value that
                 * effectively prevents generating frequencies beyond the
                 * graphics controller's tolerance.
                 */
                pATI->ClockDescriptor.MinM = pATI->ClockDescriptor.MaxM =
                    ATIMach64GetPLLReg(PLL_REF_DIV);

                /* The DAC is also integrated */
                if ((pATI->DAC & ~0x0FU) != ATI_DAC_INTERNAL)
                    ClockDac = ATI_DAC_INTERNAL;

                break;

            case ATI_CLOCK_ATT20C408:
                /* This one's also a RAMDAC */
                ClockDac = ATI_DAC_ATT20C408;
                break;

            case ATI_CLOCK_IBMRGB514:
                /* This one's also a RAMDAC */
                ClockDac = ATI_DAC_IBMRGB514;
                pATI->ClockNumberToProgramme = 7;
                break;

            default:
                break;
        }

        /*
         * We now have up to two indications of what RAMDAC the adapter uses.
         * They should be the same.  The following test and corresponding
         * action are under construction.
         */
        if (pATI->DAC != ClockDac)
        {
            xf86DrvMsg(pScreenInfo->scrnIndex, X_WARNING,
                       "Mach64 RAMDAC probe discrepancy detected:\n"
                       "  DAC=0x%02X;  ClockDac=0x%02X.\n",
                       pATI->DAC, ClockDac);

            if (pATI->DAC == ATI_DAC_IBMRGB514)
            {
                pATI->ProgrammableClock = ATI_CLOCK_IBMRGB514;
                pATI->ClockDescriptor =
                    ATIClockDescriptors[ATI_CLOCK_IBMRGB514];
                pATI->ClockNumberToProgramme = 7;
            }
            else
            {
                pATI->DAC = ClockDac;   /* For now */
            }
        }

        /*
         * Pick up multimedia information, which will be at different
         * displacements depending on table revision.
         */
        if (VideoTable > 0)
        {
            switch (BIOSByte(VideoTable - 0x02U))
            {
                case 0x00U:
                    pATI->Tuner = BIOSByte(VideoTable) & 0x1FU;

                    /*
                     * XXX  The VideoTable[1] byte is known to have been
                     *      omitted in LTPro and Mobility BIOS'es.  Any others?
                     */
                    switch (pATI->Chip)
                    {
                        case ATI_CHIP_264LTPRO:
                        case ATI_CHIP_MOBILITY:
                            pATI->Decoder =
                                BIOSByte(VideoTable + 0x01U) & 0x07U;
                            pATI->Audio =
                                BIOSByte(VideoTable + 0x02U) & 0x0FU;
                            break;

                        default:
                            pATI->Decoder =
                                BIOSByte(VideoTable + 0x02U) & 0x07U;
                            pATI->Audio =
                                BIOSByte(VideoTable + 0x03U) & 0x0FU;
                            break;
                    }

                    break;

                case 0x01U:
                    pATI->Tuner = BIOSByte(VideoTable) & 0x1FU;
                    pATI->Audio = BIOSByte(VideoTable + 0x01U) & 0x0FU;
                    pATI->Decoder = BIOSByte(VideoTable + 0x05U) & 0x0FU;
                    break;

                default:
                    break;
            }
        }

        /* Determine panel dimensions */
        if (pATI->LCDPanelID >= 0)
        {
            LCDTable = BIOSWord(0x78U);
            if ((LCDTable + BIOSByte(LCDTable + 5)) > BIOSSize)
                LCDTable = 0;

            if (LCDTable > 0)
            {
                LCDPanelInfo = BIOSWord(LCDTable + 0x0AU);
                if (((LCDPanelInfo + 0x1DU) > BIOSSize) ||
                    ((BIOSByte(LCDPanelInfo) != pATI->LCDPanelID) &&
                     (pATI->LCDPanelID || (BIOSByte(LCDPanelInfo) > 0x1FU) ||
                      (pATI->Chip <= ATI_CHIP_264LTPRO))))
                    LCDPanelInfo = 0;
            }

            if (!LCDPanelInfo)
            {
                /*
                 * Scan BIOS for panel info table.
                 */
                for (i = 0;  i <= (int)(BIOSSize - 0x1DU);  i++)
                {
                    /* Look for panel ID ... */
                    if ((BIOSByte(i) != pATI->LCDPanelID) &&
                        (pATI->LCDPanelID || (BIOSByte(i) > 0x1FU) ||
                         (pATI->Chip <= ATI_CHIP_264LTPRO)))
                        continue;

                    /* ... followed by 24-byte panel model name ... */
                    for (j = 0;  j < 24;  j++)
                    {
                        if ((CARD8)(BIOSByte(i + j + 1) - 0x20U) > 0x5FU)
                        {
                            i += j;
                            goto NextBIOSByte;
                        }
                    }

                    /* ... verify panel width ... */
                    if (pATI->LCDHorizontal &&
                        (pATI->LCDHorizontal != BIOSWord(i + 0x19U)))
                        continue;

                    /* ... and verify panel height */
                    if (pATI->LCDVertical &&
                        (pATI->LCDVertical != BIOSWord(i + 0x1BU)))
                        continue;

                    if (LCDPanelInfo)
                    {
                        /*
                         * More than one possibility, but don't care if all
                         * tables describe panels of the same size.
                         */
                        if ((BIOSByte(LCDPanelInfo + 0x19U) ==
                             BIOSByte(i + 0x19U)) &&
                            (BIOSByte(LCDPanelInfo + 0x1AU) ==
                             BIOSByte(i + 0x1AU)) &&
                            (BIOSByte(LCDPanelInfo + 0x1BU) ==
                             BIOSByte(i + 0x1BU)) &&
                            (BIOSByte(LCDPanelInfo + 0x1CU) ==
                             BIOSByte(i + 0x1CU)))
                            continue;

                        LCDPanelInfo = 0;
                        break;
                    }

                    LCDPanelInfo = i;

            NextBIOSByte:  ;
                }
            }

            if (LCDPanelInfo > 0)
            {
                pATI->LCDPanelID = BIOSByte(LCDPanelInfo);
                pATI->LCDHorizontal = BIOSWord(LCDPanelInfo + 0x19U);
                pATI->LCDVertical = BIOSWord(LCDPanelInfo + 0x1BU);
            }
        }

        xf86DrvMsgVerb(pScreenInfo->scrnIndex, X_INFO, 3,
            "BIOS Data:  BIOSSize=0x%04X, ROMTable=0x%04X.\n",
            BIOSSize, ROMTable);
        xf86DrvMsgVerb(pScreenInfo->scrnIndex, X_INFO, 3,
            "BIOS Data:  ClockTable=0x%04X, FrequencyTable=0x%04X.\n",
            ClockTable, FrequencyTable);
        xf86DrvMsgVerb(pScreenInfo->scrnIndex, X_INFO, 3,
            "BIOS Data:  LCDTable=0x%04X, LCDPanelInfo=0x%04X.\n",
            LCDTable, LCDPanelInfo);
        xf86DrvMsgVerb(pScreenInfo->scrnIndex, X_INFO, 3,
            "BIOS Data:  VideoTable=0x%04X, HardwareTable=0x%04X.\n",
            VideoTable, HardwareTable);
        xf86DrvMsgVerb(pScreenInfo->scrnIndex, X_INFO, 3,
            "BIOS Data:  I2CType=0x%02X, Tuner=0x%02X, Decoder=0x%02X,"
            " Audio=0x%02X.\n",
            pATI->I2CType, pATI->Tuner, pATI->Decoder, pATI->Audio);
    }

    ATIUnlock(pATI);            /* Unlock registers */

#ifndef AVOID_CPIO

    /* Sometimes, the BIOS lies about the chip */
    if ((pATI->Chip >= ATI_CHIP_28800_4) && (pATI->Chip <= ATI_CHIP_28800_6))
    {
        IOValue = GetBits(ATIGetExtReg(0xAAU), 0x0FU) +
            (ATI_CHIP_28800_4 - 4);
        if ((IOValue <= ATI_CHIP_28800_6) && (IOValue > pATI->Chip))
            pATI->Chip = IOValue;
    }

#endif /* AVOID_CPIO */

    /* Report what was found */
    xf86DrvMsg(pScreenInfo->scrnIndex, X_PROBED,
        "%s graphics controller detected.\n", ATIChipNames[pATI->Chip]);

#ifndef AVOID_CPIO

    if ((pATI->Chip >= ATI_CHIP_68800) && (pATI->Chip != ATI_CHIP_68800_3))

#endif /* AVOID_CPIO */

    {
        Message = Buffer + snprintf(Buffer, SizeOf(Buffer), "Chip type %04X",
            pATI->ChipType);
        if (!(pATI->ChipType & ~(CHIP_CODE_0 | CHIP_CODE_1)))
            Message += snprintf(Message, Buffer + SizeOf(Buffer) - Message,
                " (%c%c)",
                GetBits(pATI->ChipType, CHIP_CODE_1) + 0x41U,
                GetBits(pATI->ChipType, CHIP_CODE_0) + 0x41U);
        else if ((pATI->ChipType & 0x4040U) == 0x4040U)
            Message += snprintf(Message, Buffer + SizeOf(Buffer) - Message,
                " \"%c%c\"",
                GetByte(pATI->ChipType, 1), GetByte(pATI->ChipType, 0));
        if ((pATI->Chip >= ATI_CHIP_264CT) && (pATI->Chip != ATI_CHIP_Mach64))
            Message += snprintf(Message, Buffer + SizeOf(Buffer) - Message,
                ", version %d, foundry %s",
                pATI->ChipVersion, ATIFoundryNames[pATI->ChipFoundry]);
        xf86DrvMsg(pScreenInfo->scrnIndex, X_PROBED,
            "%s, class %d, revision 0x%02X.\n",
            Buffer, pATI->ChipClass, pATI->ChipRevision);
    }

#ifndef AVOID_CPIO

    if (pATI->Adapter >= ATI_ADAPTER_MACH8)

#endif /* AVOID_CPIO */

    {
        Message = Buffer + snprintf(Buffer, SizeOf(Buffer),
            "%s bus interface detected", ATIBusNames[pATI->BusType]);

#ifndef AVOID_CPIO

        if (pATI->Adapter >= ATI_ADAPTER_MACH64)
        {
            Message += snprintf(Message, Buffer + SizeOf(Buffer) - Message,
                ";  %s I/O base is 0x%04lX",
                (pATI->CPIODecoding == SPARSE_IO) ? "sparse" : "block",
                pATI->CPIOBase);
        }

#endif /* AVOID_CPIO */

        xf86DrvMsg(pScreenInfo->scrnIndex, X_PROBED, "%s.\n", Buffer);
    }

#ifndef AVOID_CPIO

    if (pATI->CPIO_VGAWonder)
        xf86DrvMsg(pScreenInfo->scrnIndex, X_PROBED,
            "VGA Wonder registers at I/O port 0x%04lX.\n",
            pATI->CPIO_VGAWonder);

    if (pATI->Coprocessor != ATI_CHIP_NONE)
        xf86DrvMsg(pScreenInfo->scrnIndex, X_PROBED,
            "%s graphics accelerator detected,\n with %d kB of coprocessor"
            " memory.\n",
            ATIChipNames[pATI->Coprocessor], pATI->VideoRAM);

#endif /* AVOID_CPIO */

    xf86DrvMsg(pScreenInfo->scrnIndex, X_PROBED,
        "%s adapter detected.\n", ATIAdapterNames[pATI->Adapter]);

    if (pATI->Chip >= ATI_CHIP_264GT)
        xf86DrvMsg(pScreenInfo->scrnIndex, X_NOTICE,
            "For information on using the multimedia capabilities\n\tof this"
            " adapter, please see http://gatos.sf.net.\n");

    if ((pATI->DAC & ~0x0FU) == ATI_DAC_INTERNAL)
    {
        xf86DrvMsg(pScreenInfo->scrnIndex, X_PROBED,
            "Internal RAMDAC (subtype %d) detected.\n", pATI->DAC & 0x0FU);
    }
    else
    {
        const SymTabRec *DAC;

        for (DAC = ATIDACDescriptors;  ;  DAC++)
        {
            if (pATI->DAC == DAC->token)
            {
                xf86DrvMsg(pScreenInfo->scrnIndex, X_PROBED,
                    "%s RAMDAC detected.\n", DAC->name);
                break;
            }

            if (pATI->DAC < DAC->token)
            {
                xf86DrvMsgVerb(pScreenInfo->scrnIndex, X_WARNING, 0,
                    "Unknown RAMDAC type 0x%02X detected.\n", pATI->DAC);
                break;
            }
        }
    }

#ifdef AVOID_CPIO

    if (!xf86LinearVidMem())
    {
        xf86DrvMsg(pScreenInfo->scrnIndex, X_ERROR,
            "A linear aperture is not available.\n");
        ATILock(pATI);
        ATIPrintNoiseIfRequested(pATI, BIOS, BIOSSize);
        ATIUnmapApertures(pScreenInfo->scrnIndex, pATI);
        return FALSE;