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dmacvar.h revision 1.2 
      1 /*	$NetBSD: dmacvar.h,v 1.2 1999/03/16 16:30:17 minoura Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Minoura Makoto.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Hitachi HD63450 (= Motorola MC68450) DMAC driver for x68k.
     41  */
     42 
     43 #include <dev/ic/mc68450reg.h>
     44 
     45 
     46 typedef int (*dmac_intr_handler_t) __P((void*));
     47 
     48 /*
     49  * Struct that holds the channel status.
     50  * Embedded in the device softc for each channel.
     51  */
     52 struct dmac_channel_stat {
     53 	int			ch_channel; /* channel number */
     54 	char			ch_name[8]; /* user device name */
     55 	bus_space_handle_t	ch_bht;	/* bus_space handle */
     56 	int			ch_dcr;	/* device description */
     57 	int			ch_ocr;	/* operation size, request mode */
     58 	int			ch_normalv; /* normal interrupt vector */
     59 	int			ch_errorv; /* error interrupt vector */
     60 	dmac_intr_handler_t	ch_normal; /* normal interrupt handler */
     61 	dmac_intr_handler_t	ch_error; /* error interrupt handler */
     62 	void			*ch_normalarg;
     63 	void			*ch_errorarg;
     64 	struct dmac_dma_xfer	*ch_xfer_in_progress;
     65 	void			*ch_map; /* transfer map for arraychain mode */
     66 	struct device		*ch_softc; /* device softc link */
     67 };
     68 
     69 /*
     70  * DMAC softc
     71  */
     72 struct dmac_softc {
     73 	struct device		sc_dev;
     74 
     75 	bus_space_tag_t		sc_bst;
     76 	bus_space_handle_t	sc_bht;
     77 
     78 	struct dmac_channel_stat sc_channels[DMAC_NCHAN];
     79 };
     80 
     81 /*
     82  * Structure that describes a single transfer.
     83  */
     84 struct dmac_dma_xfer {
     85 	struct dmac_channel_stat *dx_channel; /* channel structure */
     86 	bus_dmamap_t	dx_dmamap;	/* dmamap tag */
     87 	bus_dma_tag_t	dx_tag;		/* dma tag for the transfer */
     88 	int		dx_ocr;		/* direction */
     89 	int		dx_scr;		/* SCR value */
     90 	void		*dx_device;	/* (initial) device address */
     91 	int		dx_done;	/* transfer count */
     92 };
     93 
     94 
     95 #define DMAC_ADDR	0xe84000
     96 
     97 #define DMAC_MAXSEGSZ	0xff00
     98 #define DMAC_BOUNDARY	0
     99 
    100 struct dmac_channel_stat *dmac_alloc_channel __P((struct device*, int, char*,
    101 						  int,
    102 						  dmac_intr_handler_t, void*,
    103 						  int,
    104 						  dmac_intr_handler_t, void*));
    105 		/* ch, name, normalv, normal, errorv, error */
    106 int dmac_free_channel __P((struct device*, int, void*));
    107 		/* ch, channel */
    108 struct dmac_dma_xfer *dmac_prepare_xfer __P((struct dmac_channel_stat*,
    109 					     bus_dma_tag_t,
    110 					     bus_dmamap_t,
    111 					     int, int, void*));
    112 	/* chan, dmat, map, dir, sequence, dar */
    113 #define dmac_finish_xfer(xfer) free(xfer, M_DEVBUF)
    114 int dmac_start_xfer __P((struct device*, struct dmac_dma_xfer*));
    115