IABSD.fr/xenocara/driver/xf86-video-nv/src/g80_dma.c

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• Author : matthieu
  Date : 2007-06-08 22:09:04
  Hash : ba395da8
  Message : Import xf86-video-nv version 2.0.2. Adds new chipsets support.

• driver/xf86-video-nv/src/g80_dma.c

• /*
   * Copyright (c) 2007 NVIDIA, Corporation
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the
   * "Software"), to deal in the Software without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sublicense, and/or sell copies of the Software, and to
   * permit persons to whom the Software is furnished to do so, subject to
   * the following conditions:
   *
   * The above copyright notice and this permission notice shall be included
   * in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
   * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
   * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
   * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
   * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include "g80_type.h"
  #include "g80_dma.h"
  
  void G80DmaKickoff(G80Ptr pNv)
  {
      if(pNv->dmaCurrent != pNv->dmaPut) {
          pNv->dmaPut = pNv->dmaCurrent;
          pNv->reg[0x00c02040/4] = pNv->dmaPut << 2;
      }
  }
  
  void G80DmaWait(G80Ptr pNv, int size)
  {
      CARD32 dmaGet;
  
      size++;
  
      while(pNv->dmaFree < size) {
          dmaGet = pNv->reg[0x00c02044/4] >> 2;
  
          if(pNv->dmaPut >= dmaGet) {
              pNv->dmaFree = pNv->dmaMax - pNv->dmaCurrent;
              if(pNv->dmaFree < size) {
                  G80DmaNext(pNv, 0x20000000);
                  if(dmaGet <= SKIPS) {
                      if(pNv->dmaPut <= SKIPS) /* corner case - will be idle */
                          pNv->reg[0x00c02040/4] = (SKIPS + 1) << 2;
                      do { dmaGet = pNv->reg[0x00c02044/4] >> 2; }
                      while(dmaGet <= SKIPS);
                  }
                  pNv->reg[0x00c02040/4] = SKIPS << 2;
                  pNv->dmaCurrent = pNv->dmaPut = SKIPS;
                  pNv->dmaFree = dmaGet - (SKIPS + 1);
              }
          } else
              pNv->dmaFree = dmaGet - pNv->dmaCurrent - 1;
      }
  }