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      1 /*	$NetBSD: iomd_dma.h,v 1.3 2009/03/14 14:45:55 dsl Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Scott Stevens
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Scott Stevens.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *      @(#)dmavar.h
     34  */
     35 
     36 /*
     37  * dma structures
     38  */
     39 
     40 struct dma_ctrl {
     41 	int			dc_flags;
     42 	int			dc_channel;
     43 	int			dc_dmasize;
     44 	volatile u_int		*dc_cura;
     45 	volatile u_int		*dc_enda;
     46 	volatile u_int		*dc_curb;
     47 	volatile u_int		*dc_endb;
     48 	volatile u_char		*dc_cr;
     49 	volatile u_char		*dc_st;
     50 
     51 	u_char			*dc_nextaddr;
     52 	int			dc_len;
     53 
     54 	irqhandler_t		dc_ih;
     55 };
     56 
     57 #define DMA_FL_ACTIVE	0x01
     58 #define DMA_FL_READY	0x02
     59 
     60 #define DMA_CR_CLEAR	0x80
     61 #define DMA_CR_DIR	0x40
     62 #define DMA_CR_ENABLE	0x20
     63 #define DMA_CR_INC	0x1f
     64 
     65 #define DMA_ST_CHAN	0x01
     66 #define DMA_ST_INT	0x02
     67 #define DMA_ST_OVER	0x04
     68 #define DMA_ST_MASK	(DMA_ST_CHAN | DMA_ST_INT | DMA_ST_OVER)
     69 
     70 #define DMA_END_STOP	0x80000000
     71 #define DMA_END_LAST	0x40000000
     72 
     73 /* Prototypes */
     74 struct dma_ctrl *dma_init(int, int, int, int);
     75 void dma_go(struct dma_ctrl *);
     76 int dma_reset(struct dma_ctrl *);
     77 int dma_setup(struct dma_ctrl *, u_char *, int, int);
     78 int dma_isactive(struct dma_ctrl *);
     79 int dma_isintr(struct dma_ctrl *);
     80 int dma_intr(void *);
     81