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/*
* 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.
*/
/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/sunffb/ffb_fifo.h,v 1.2 2000/05/23 04:47:44 dawes Exp $ */
#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 occuring
* 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 */
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