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dmacvar.h revision 1.4 
      1 /*	$NetBSD: dmacvar.h,v 1.4 2001/05/02 12:48:24 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 #include <machine/bus.h>
     45 
     46 #define DMAC_MAPSIZE 64
     47 
     48 typedef int (*dmac_intr_handler_t) __P((void*));
     49 
     50 /*
     51  * Structure that describes a single transfer.
     52  */
     53 struct dmac_channel_stat;
     54 struct dmac_dma_xfer {
     55 	struct dmac_channel_stat *dx_channel;
     56 	bus_dmamap_t	dx_dmamap;	/* dmamap tag */
     57 	bus_dma_tag_t	dx_tag;		/* dma tag for the transfer */
     58 	int		dx_ocr;		/* direction */
     59 	int		dx_scr;		/* SCR value */
     60 	void		*dx_device;	/* (initial) device address */
     61 #ifdef DMAC_ARRAYCHAIN
     62 	struct dmac_sg_array *dx_array;	/* DMAC array chain */
     63 	int		dx_done;
     64 #endif
     65 	int		dx_nextoff;	/* for continued operation */
     66 	int		dx_nextsize;
     67 };
     68 
     69 /*
     70  * Struct that holds the channel status.
     71  * Embedded in the device softc for each channel.
     72  */
     73 struct dmac_channel_stat {
     74 	int			ch_channel; /* channel number */
     75 	char			ch_name[8]; /* user device name */
     76 	bus_space_handle_t	ch_bht;	/* bus_space handle */
     77 	int			ch_dcr;	/* device description */
     78 	int			ch_ocr;	/* operation size, request mode */
     79 	int			ch_normalv; /* normal interrupt vector */
     80 	int			ch_errorv; /* error interrupt vector */
     81 	dmac_intr_handler_t	ch_normal; /* normal interrupt handler */
     82 	dmac_intr_handler_t	ch_error; /* error interrupt handler */
     83 	void			*ch_normalarg;
     84 	void			*ch_errorarg;
     85 	struct dmac_dma_xfer	ch_xfer;
     86 	struct dmac_sg_array	*ch_map; /* transfer map for arraychain mode */
     87 	bus_dma_segment_t	ch_seg[1];
     88 	struct device		*ch_softc; /* device softc link */
     89 };
     90 
     91 /*
     92  * DMAC softc
     93  */
     94 struct dmac_softc {
     95 	struct device		sc_dev;
     96 
     97 	bus_space_tag_t		sc_bst;
     98 	bus_space_handle_t	sc_bht;
     99 
    100 	struct dmac_channel_stat sc_channels[DMAC_NCHAN];
    101 };
    102 
    103 
    104 #define DMAC_ADDR	0xe84000
    105 
    106 #define DMAC_MAXSEGSZ	0xff00
    107 #define DMAC_BOUNDARY	0
    108 
    109 struct dmac_channel_stat *dmac_alloc_channel __P((struct device*, int, char*,
    110 						  int,
    111 						  dmac_intr_handler_t, void*,
    112 						  int,
    113 						  dmac_intr_handler_t, void*));
    114 		/* ch, name, normalv, normal, errorv, error */
    115 int dmac_free_channel __P((struct device*, int, void*));
    116 		/* ch, channel */
    117 struct dmac_dma_xfer *dmac_alloc_xfer __P((struct dmac_channel_stat*,
    118 					  bus_dma_tag_t, bus_dmamap_t));
    119 int dmac_load_xfer __P((struct device*, struct dmac_dma_xfer *));
    120 
    121 int dmac_start_xfer __P((struct device*, struct dmac_dma_xfer*));
    122 int dmac_start_xfer_offset __P((struct device*, struct dmac_dma_xfer*,
    123 				u_int, u_int));
    124 int dmac_abort_xfer __P((struct device*, struct dmac_dma_xfer*));
    125 /* Compatibility function: alloc, fill defaults, load */
    126 struct dmac_dma_xfer *dmac_prepare_xfer __P((struct dmac_channel_stat*,
    127 					     bus_dma_tag_t,
    128 					     bus_dmamap_t,
    129 					     int, int, void*));
    130 	/* chan, dmat, map, dir, sequence, dar */
    131