/* * 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 */