/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/ati/atimach64io.c,v 1.6 2003/04/23 21:51:29 tsi Exp $ *//* * Copyright 2000 through 2004 by Marc Aurele La France (TSI @ UQV), tsi@xfree86.org * * 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 Marc Aurele La France not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission.  Marc Aurele La France makes no representations * about the suitability of this software for any purpose.  It is provided * "as-is" without express or implied warranty. * * MARC AURELE LA FRANCE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO * EVENT SHALL MARC AURELE LA FRANCE 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. */#ifdef HAVE_CONFIG_H#include "config.h"#endif#include "ati.h"#include "atichip.h"#include "atimach64io.h"/* * ATIMach64AccessPLLReg -- * * This function sets up the addressing required to access, for read or write, * a 264xT's PLL registers. */voidATIMach64AccessPLLReg(    ATIPtr      pATI,    const CARD8 Index,    const Bool  Write){    CARD8 clock_cntl1 = in8(CLOCK_CNTL + 1) &        ~GetByte(PLL_WR_EN | PLL_ADDR, 1);    /* Set PLL register to be read or written */    out8(CLOCK_CNTL + 1, clock_cntl1 |        GetByte(SetBits(Index, PLL_ADDR) | SetBits(Write, PLL_WR_EN), 1));}/* * ATIMach64PollEngineStatus -- * * This function refreshes the driver's view of the draw engine's status.  This * has been moved into a separate compilation unit to prevent inlining. */voidATIMach64PollEngineStatus(    ATIPtr pATI){    CARD32 IOValue;    int    Count;    if (pATI->Chip < ATI_CHIP_264VTB)    {        /*         * TODO:  Deal with locked engines.         */        IOValue = inm(FIFO_STAT);        pATI->EngineIsLocked = GetBits(IOValue, FIFO_ERR);        /*         * The following counts the number of bits in FIFO_STAT_BITS, and is         * derived from miSetVisualTypes().         */        IOValue = GetBits(IOValue, FIFO_STAT_BITS);        Count = (IOValue >> 1) & 0x36DBU;        Count = IOValue - Count - ((Count >> 1) & 0x36DBU);        Count = ((Count + (Count >> 3)) & 0x71C7U) % 0x3FU;        Count = pATI->nFIFOEntries - Count;        if (Count > pATI->nAvailableFIFOEntries)            pATI->nAvailableFIFOEntries = Count;        /*         * If the command FIFO is non-empty, then the engine isn't idle.         */        if (pATI->nAvailableFIFOEntries < pATI->nFIFOEntries)        {            pATI->EngineIsBusy = TRUE;            return;        }    }    IOValue = inm(GUI_STAT);    pATI->EngineIsBusy = GetBits(IOValue, GUI_ACTIVE);    Count = GetBits(IOValue, GUI_FIFO);    if (Count > pATI->nAvailableFIFOEntries)        pATI->nAvailableFIFOEntries = Count;}