IABSD.fr/xenocara/driver/xf86-video-sunffb/src/ffb_fifo.h

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• Author : matthieu
  Date : 2023-05-09 20:17:04
  Hash : d1a8d3ab
  Message : Update to xf86-video-sunffb 1.2.3

• driver/xf86-video-sunffb/src/ffb_fifo.h

• /*
   * Acceleration for the Creator and Creator3D framebuffer - fifo macros.
   *
   * Copyright (C) 1998,1999 Jakub Jelinek (jakub@redhat.com)
   * Copyright (C) 1999 David S. Miller (davem@redhat.com)
   *
   * 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
   * JAKUB JELINEK OR DAVID MILLER 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.
   */
  
  #ifndef FFBFIFO_H
  #define FFBFIFO_H
  
  #include "ffb.h"
  
  /* This is the smallest FFB fifo size I know of. -DaveM */
  #define FFB_FIFO_MIN	124
  
  #define FFBFifo(__fpriv, __n) \
  do { 	int __cur_slots = (__fpriv)->fifo_cache; \
  	if((__cur_slots - (__n)) < 0) { \
  		ffb_fbcPtr __ffb = pFfb->regs; \
  		do {	__cur_slots = (((int)__ffb->ucsr & FFB_UCSR_FIFO_MASK) - 4); \
  		} while((__cur_slots - (__n)) < 0); \
  	} (__fpriv)->fifo_cache = (__cur_slots - (__n)); \
  } while(0)
  
  /* While we are polling for the raster processor to idle, cache the
   * fifo count as well.
   */
  #define FFBWait(__fpriv, __ffb) \
  if ((__fpriv)->rp_active != 0) { \
  	unsigned int __regval = (__ffb)->ucsr; \
  	while((__regval & FFB_UCSR_RP_BUSY) != 0) { \
  		__regval = (__ffb)->ucsr; \
  	} \
  	(__fpriv)->fifo_cache = ((int)(__regval & FFB_UCSR_FIFO_MASK)) - 4; \
  	(__fpriv)->rp_active = 0; \
  } while(0)
  
  /* DEBUGGING:  You can use this if you suspect corruption is occurring
   *             because someone is touching the framebuffer while the
   *	       raster processor is active.  If you enable this and the
   *	       problem goes away, odds are your suspicions are correct.
   */
  #undef FORCE_WAIT_EVERY_ROP
  #ifdef FORCE_WAIT_EVERY_ROP
  #define FFBSync(__fpriv, __ffb)	FFBWait(__fpriv, __ffb)
  #else
  #define FFBSync(__fpriv, __ffb)	do { } while(0)
  #endif
  
  #endif /* FFBFIFO_H */