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sivar.h revision 1.2 
      1 /*	$NetBSD: sivar.h,v 1.2 1996/10/30 00:24:41 gwr Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 David Jones, Gordon W. Ross
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the authors may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  * 4. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed by
     20  *      David Jones and Gordon Ross
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 /*
     35  * This file defines the interface between si.c and
     36  * the bus-specific files: si_obio.c, si_vme.c
     37  */
     38 
     39 /*
     40  * Transfers smaller than this are done using PIO
     41  * (on assumption they're not worth DMA overhead)
     42  */
     43 #define	MIN_DMA_LEN 128
     44 
     45 /*
     46  * Transfers lager than 65535 bytes need to be split-up.
     47  * (Some of the FIFO logic has only 16 bits counters.)
     48  * Make the size an integer multiple of the page size
     49  * to avoid buf/cluster remap problems.  (paranoid?)
     50  */
     51 #define	MAX_DMA_LEN 0xE000
     52 
     53 /*
     54  * This structure is used to keep track of mapped DMA requests.
     55  */
     56 struct si_dma_handle {
     57 	int 		dh_flags;
     58 #define	SIDH_BUSY	1		/* This DH is in use */
     59 #define	SIDH_OUT	2		/* DMA does data out (write) */
     60 	u_char *	dh_addr;	/* KVA of start of buffer */
     61 	int 		dh_maplen;	/* Length of KVA mapping. */
     62 	long		dh_dvma;	/* VA of buffer in DVMA space */
     63 };
     64 
     65 /*
     66  * The first structure member has to be the ncr5380_softc
     67  * so we can just cast to go back and fourth between them.
     68  */
     69 struct si_softc {
     70 	struct ncr5380_softc	ncr_sc;
     71 	volatile struct si_regs	*sc_regs;
     72 	int		sc_adapter_type;
     73 	int		sc_adapter_iv_am;	/* int. vec + address modifier */
     74 	int 	sc_options;			/* options for this instance */
     75 	int 	sc_reqlen;  		/* requested transfer length */
     76 	struct si_dma_handle *sc_dma;
     77 	/* DMA command block for the OBIO controller. */
     78 	void *sc_dmacmd;
     79 };
     80 
     81 /* Options.  Interesting values are: 1,3,7 */
     82 #define SI_ENABLE_DMA	1	/* Use DMA (maybe polled) */
     83 #define SI_DMA_INTR 	2	/* DMA completion interrupts */
     84 #define	SI_DO_RESELECT	4	/* Allow disconnect/reselect */
     85 /* The options are taken from the config file (PR#1929) */
     86 
     87 extern int si_debug;
     88 
     89 void si_attach __P((struct si_softc *));
     90 int  si_intr __P((void *));
     91 
     92 void si_reset_adapter __P((struct ncr5380_softc *));
     93 
     94 void si_dma_alloc __P((struct ncr5380_softc *));
     95 void si_dma_free __P((struct ncr5380_softc *));
     96 void si_dma_poll __P((struct ncr5380_softc *));
     97