1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/sh4/dmac.h	Mon Jan 02 14:48:29 2006 +0000
     1.3 @@ -0,0 +1,62 @@
     1.4 +/**
     1.5 + * $Id: dmac.h,v 1.1 2006-01-02 14:48:29 nkeynes Exp $
     1.6 + *
     1.7 + * SH4 onboard DMA controller (DMAC) definitions.
     1.8 + *
     1.9 + * Copyright (c) 2005 Nathan Keynes.
    1.10 + *
    1.11 + * This program is free software; you can redistribute it and/or modify
    1.12 + * it under the terms of the GNU General Public License as published by
    1.13 + * the Free Software Foundation; either version 2 of the License, or
    1.14 + * (at your option) any later version.
    1.15 + *
    1.16 + * This program is distributed in the hope that it will be useful,
    1.17 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.18 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.19 + * GNU General Public License for more details.
    1.20 + */
    1.21 +
    1.22 +#ifndef dream_sh4dmac_H
    1.23 +#define dream_sh4dmac_H 1
    1.24 +
    1.25 +#include <stdint.h>
    1.26 +
    1.27 +#ifdef __cplusplus
    1.28 +extern "C" {
    1.29 +#endif
    1.30 +
    1.31 +/* External DREQ. Note only used for DMA memory-to-memory - for single 
    1.32 + * address transfers the device uses DMAC_get_buffer/DMAC_put_buffer.
    1.33 + */
    1.34 +#define DMAC_EXTERNAL 0 
    1.35 +#define DMAC_SCI_TDE 1  /* SCI Transmit data empty */
    1.36 +#define DMAC_SCI_RDF 2  /* SCI Receive data full */
    1.37 +#define DMAC_SCIF_TDE 3 /* SCIF Transmit data empty */
    1.38 +#define DMAC_SCIF_RDF 4 /* SCIF Receive data full */
    1.39 +#define DMAC_TMU_ICI 5  /* TMU Input capture interrupt (not used?) */
    1.40 +
    1.41 +/**
    1.42 + * Trigger a DMAC transfer by asserting one of the above DMA request lines
    1.43 + * (from the onboard peripherals). Actual transfer is dependent on the 
    1.44 + * relevant channel configuration.
    1.45 + */
    1.46 +void DMAC_trigger( int dmac_trigger );
    1.47 +
    1.48 +/**
    1.49 + * Execute a memory-to-external-device transfer. Copies data into the supplied
    1.50 + * buffer up to a maximum of bytecount bytes. 
    1.51 + * @return Actual number of bytes copied.
    1.52 + */
    1.53 +uint32_t DMAC_get_buffer( int channel, char *buf, uint32_t bytecount );
    1.54 +
    1.55 +/**
    1.56 + * execute an external-device-to-memory transfer. Copies data from the 
    1.57 + * supplied buffer into memory up to a maximum of bytecount bytes. 
    1.58 + * @return Actual number of bytes copied.
    1.59 + */
    1.60 +uint32_t DMAC_put_buffer( int channel, char *buf, uint32_t bytecount );
    1.61 +
    1.62 +#ifdef __cplusplus
    1.63 +}
    1.64 +#endif
    1.65 +#endif