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