nkeynes@58: /**
nkeynes@561:  * $Id$
nkeynes@58:  *
nkeynes@58:  * SH4 onboard DMA controller (DMAC) definitions.
nkeynes@58:  *
nkeynes@58:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@58:  *
nkeynes@58:  * This program is free software; you can redistribute it and/or modify
nkeynes@58:  * it under the terms of the GNU General Public License as published by
nkeynes@58:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@58:  * (at your option) any later version.
nkeynes@58:  *
nkeynes@58:  * This program is distributed in the hope that it will be useful,
nkeynes@58:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@58:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@58:  * GNU General Public License for more details.
nkeynes@58:  */
nkeynes@58: 
nkeynes@58: #ifndef dream_sh4dmac_H
nkeynes@58: #define dream_sh4dmac_H 1
nkeynes@58: 
nkeynes@58: #include <stdint.h>
nkeynes@58: 
nkeynes@58: #ifdef __cplusplus
nkeynes@58: extern "C" {
nkeynes@58: #endif
nkeynes@58: 
nkeynes@58: /* External DREQ. Note only used for DMA memory-to-memory - for single 
nkeynes@58:  * address transfers the device uses DMAC_get_buffer/DMAC_put_buffer.
nkeynes@58:  */
nkeynes@58: #define DMAC_EXTERNAL 0 
nkeynes@58: #define DMAC_SCI_TDE 1  /* SCI Transmit data empty */
nkeynes@58: #define DMAC_SCI_RDF 2  /* SCI Receive data full */
nkeynes@58: #define DMAC_SCIF_TDE 3 /* SCIF Transmit data empty */
nkeynes@58: #define DMAC_SCIF_RDF 4 /* SCIF Receive data full */
nkeynes@58: #define DMAC_TMU_ICI 5  /* TMU Input capture interrupt (not used?) */
nkeynes@58: 
nkeynes@58: /**
nkeynes@58:  * Trigger a DMAC transfer by asserting one of the above DMA request lines
nkeynes@58:  * (from the onboard peripherals). Actual transfer is dependent on the 
nkeynes@58:  * relevant channel configuration.
nkeynes@58:  */
nkeynes@58: void DMAC_trigger( int dmac_trigger );
nkeynes@58: 
nkeynes@58: /**
nkeynes@58:  * Execute a memory-to-external-device transfer. Copies data into the supplied
nkeynes@58:  * buffer up to a maximum of bytecount bytes. 
nkeynes@58:  * @return Actual number of bytes copied.
nkeynes@58:  */
nkeynes@430: uint32_t DMAC_get_buffer( int channel, unsigned char *buf, uint32_t bytecount );
nkeynes@58: 
nkeynes@58: /**
nkeynes@58:  * execute an external-device-to-memory transfer. Copies data from the 
nkeynes@58:  * supplied buffer into memory up to a maximum of bytecount bytes. 
nkeynes@58:  * @return Actual number of bytes copied.
nkeynes@58:  */
nkeynes@430: uint32_t DMAC_put_buffer( int channel, unsigned char *buf, uint32_t bytecount );
nkeynes@58: 
nkeynes@58: #ifdef __cplusplus
nkeynes@58: }
nkeynes@58: #endif
nkeynes@58: #endif