/* mach64_dma.c -- DMA support for mach64 (Rage Pro) driver -*- linux-c -*- */
/**
* \file mach64_dma.c
* DMA support for mach64 (Rage Pro) driver
*
* \author Gareth Hughes <gareth@valinux.com>
* \author Frank C. Earl <fearl@airmail.net>
* \author Leif Delgass <ldelgass@retinalburn.net>
* \author Jose Fonseca <j_r_fonseca@yahoo.co.uk>
*/
/*
* Copyright 2000 Gareth Hughes
* Copyright 2002 Frank C. Earl
* Copyright 2002-2003 Leif Delgass
* All Rights Reserved.
*
* 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 (including the next
* paragraph) 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 COPYRIGHT OWNER(S) 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.
*/
#include "drmP.h"
#include "drm.h"
#include "mach64_drm.h"
#include "mach64_drv.h"
/*******************************************************************/
/** \name Engine, FIFO control */
/*@{*/
/**
* Waits for free entries in the FIFO.
*
* \note Most writes to Mach64 registers are automatically routed through
* command FIFO which is 16 entry deep. Prior to writing to any draw engine
* register one has to ensure that enough FIFO entries are available by calling
* this function. Failure to do so may cause the engine to lock.
*
* \param dev_priv pointer to device private data structure.
* \param entries number of free entries in the FIFO to wait for.
*
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