/**

  * $Id$

  * 

  * DMA support code

  *

  * Copyright (c) 2006 Nathan Keynes.

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  */

 #include "lib.h"

 /**

  * Setup the DMAC for a transfer. Assumes 32-byte block transfer.

  * Caller is responsible for making sure no-one else is using the

  * channel already. 

  *

  * @param channel DMA channel to use, 0 to 3

  * @param source source address (if a memory source)

  * @param dest   destination address (if a memory destination)

  * @param length number of bytes to transfer (must be a multiple of

  *               32.

  * @param direction 0 = host to device, 1 = device to host

  */

 void dmac_prepare_channel( int channel, uint32_t source, uint32_t dest,

 			   uint32_t length, int direction );

 /**

  * Transfer data to the PVR via DMA. Target address should be

  * 0x10000000 for the TA, and 0x11000000 + VRAM address for VRAM.

  *

  * @param target Target address

  * @param buf    Data to write (must be 32-byte aligned)

  * @param length Size of data to write, in bytes.

  * @param region Target region for VRAM writes, 0 for 64-byte region, 1 for 32-byte region.

  *

  * @return 0 on success, non-zero on failure.

  */

 int pvr_dma_write( unsigned int target, char *buf, int length, int region );