/**

  * $Id: dmac.h,v 1.1 2006-01-02 14:48:29 nkeynes Exp $

  *

  * SH4 onboard DMA controller (DMAC) definitions.

  *

  * Copyright (c) 2005 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.

  */

 #ifndef dream_sh4dmac_H

 #define dream_sh4dmac_H 1

 #include <stdint.h>

 #ifdef __cplusplus

 extern "C" {

 #endif

 /* External DREQ. Note only used for DMA memory-to-memory - for single 

  * address transfers the device uses DMAC_get_buffer/DMAC_put_buffer.

  */

 #define DMAC_EXTERNAL 0 

 #define DMAC_SCI_TDE 1  /* SCI Transmit data empty */

 #define DMAC_SCI_RDF 2  /* SCI Receive data full */

 #define DMAC_SCIF_TDE 3 /* SCIF Transmit data empty */

 #define DMAC_SCIF_RDF 4 /* SCIF Receive data full */

 #define DMAC_TMU_ICI 5  /* TMU Input capture interrupt (not used?) */

 /**

  * Trigger a DMAC transfer by asserting one of the above DMA request lines

  * (from the onboard peripherals). Actual transfer is dependent on the 

  * relevant channel configuration.

  */

 void DMAC_trigger( int dmac_trigger );

 /**

  * Execute a memory-to-external-device transfer. Copies data into the supplied

  * buffer up to a maximum of bytecount bytes. 

  * @return Actual number of bytes copied.

  */

 uint32_t DMAC_get_buffer( int channel, char *buf, uint32_t bytecount );

 /**

  * execute an external-device-to-memory transfer. Copies data from the 

  * supplied buffer into memory up to a maximum of bytecount bytes. 

  * @return Actual number of bytes copied.

  */

 uint32_t DMAC_put_buffer( int channel, char *buf, uint32_t bytecount );

 #ifdef __cplusplus

 }

 #endif

 #endif