Home | History | Annotate | Line # | Download | only in dev
dmavar.h revision 1.7 
      1 /*	$NetBSD: dmavar.h,v 1.7 1997/01/30 09:04:35 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Jason R. Thorpe.  All rights reserved.
      5  * Copyright (c) 1982, 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	@(#)dmavar.h	8.1 (Berkeley) 6/10/93
     37  */
     38 
     39 #include <sys/queue.h>
     40 
     41 /* dmago flags */
     42 #define	DMAGO_BYTE	0x00	/* do byte (8 bit) transfers */
     43 #define	DMAGO_WORD	0x01	/* do word (16 bit) transfers */
     44 #define	DMAGO_LWORD	0x02	/* do longword (32 bit) transfers */
     45 #define	DMAGO_PRI	0x04	/* do "priority" DMA */
     46 #define	DMAGO_READ	0x08	/* transfer is a read */
     47 #define	DMAGO_NOINT	0x80	/* don't interrupt on completion */
     48 
     49 /* dma "controllers" (channels) */
     50 #define	DMA0		0x1
     51 #define	DMA1		0x2
     52 
     53 /*
     54  * A DMA queue entry.  Initiator drivers each have one of these,
     55  * used to queue access to the DMA controller.
     56  */
     57 struct dmaqueue {
     58 	TAILQ_ENTRY(dmaqueue) dq_list;	/* entry on the queue */
     59 	int	dq_chan;		/* OR of channels initiator can use */
     60 	void	*dq_softc;		/* initiator's softc */
     61 
     62 	/*
     63 	 * These functions are called to start the initiator when
     64 	 * it has been given the DMA controller, and to stop the
     65 	 * initiator when the DMA controller has stopped.
     66 	 */
     67 	void	(*dq_start) __P((void *));
     68 	void	(*dq_done) __P((void *));
     69 };
     70 
     71 #ifdef _KERNEL
     72 extern void	dmago(), dmafree();
     73 extern int	dmareq();
     74 extern void	dmacomputeipl __P((void));
     75 #endif
     76