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lxdream.org :: lxdream/test/dma.h
lxdream 0.9.1
released Jun 29
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filename test/dma.h
changeset 561:533f6b478071
prev185:6755a04c447f
next812:8cc61d5ea1f8
author nkeynes
date Tue Jan 01 05:08:38 2008 +0000 (12 years ago)
branchlxdream-mmu
permissions -rw-r--r--
last change Enable Id keyword on all source files
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/**
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 * $Id$
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 * 
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 * DMA support code
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 *
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 * Copyright (c) 2006 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 */
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#include "lib.h"
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/**
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 * Setup the DMAC for a transfer. Assumes 32-byte block transfer.
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 * Caller is responsible for making sure no-one else is using the
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 * channel already. 
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 *
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 * @param channel DMA channel to use, 0 to 3
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 * @param source source address (if a memory source)
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 * @param dest   destination address (if a memory destination)
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 * @param length number of bytes to transfer (must be a multiple of
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 *               32.
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 * @param direction 0 = host to device, 1 = device to host
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 */
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void dmac_prepare_channel( int channel, uint32_t source, uint32_t dest,
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			   uint32_t length, int direction );
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/**
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 * Transfer data to the PVR via DMA. Target address should be
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 * 0x10000000 for the TA, and 0x11000000 + VRAM address for VRAM.
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 *
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 * @param target Target address
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 * @param buf    Data to write (must be 32-byte aligned)
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 * @param length Size of data to write, in bytes.
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 * @param region Target region for VRAM writes, 0 for 64-byte region, 1 for 32-byte region.
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 *
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 * @return 0 on success, non-zero on failure.
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 */
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int pvr_dma_write( unsigned int target, char *buf, int length, int region );
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