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sivar.h revision 1.6 
      1 /*	$NetBSD: sivar.h,v 1.6 1997/10/17 03:33:47 gwr Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Adam Glass, David Jones, and Gordon W. Ross.
      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  * This file defines the interface between si.c and
     41  * the bus-specific files: si_obio.c, si_vme.c
     42  */
     43 
     44 /*
     45  * Transfers smaller than this are done using PIO
     46  * (on assumption they're not worth DMA overhead)
     47  */
     48 #define	MIN_DMA_LEN 128
     49 
     50 /*
     51  * Transfers lager than 65535 bytes need to be split-up.
     52  * (Some of the FIFO logic has only 16 bits counters.)
     53  * Make the size an integer multiple of the page size
     54  * to avoid buf/cluster remap problems.  (paranoid?)
     55  */
     56 #define	MAX_DMA_LEN 0xE000
     57 
     58 /*
     59  * This structure is used to keep track of mapped DMA requests.
     60  */
     61 struct si_dma_handle {
     62 	int 		dh_flags;
     63 #define	SIDH_BUSY	1		/* This DH is in use */
     64 #define	SIDH_OUT	2		/* DMA does data out (write) */
     65 	u_char *	dh_addr;	/* KVA of start of buffer */
     66 	int 		dh_maplen;	/* Length of KVA mapping. */
     67 	void *		dh_dvma;	/* VA of buffer in DVMA space */
     68 };
     69 
     70 /*
     71  * The first structure member has to be the ncr5380_softc
     72  * so we can just cast to go back and fourth between them.
     73  */
     74 struct si_softc {
     75 	struct ncr5380_softc	ncr_sc;
     76 	volatile struct si_regs	*sc_regs;
     77 	int		sc_adapter_type;
     78 	int		sc_adapter_iv_am;	/* int. vec + address modifier */
     79 	int 	sc_options;			/* options for this instance */
     80 	int 	sc_reqlen;  		/* requested transfer length */
     81 	struct si_dma_handle *sc_dma;
     82 	/* DMA command block for the OBIO controller. */
     83 	void *sc_dmacmd;
     84 };
     85 
     86 /* Options for disconnect/reselect, DMA, and interrupts. */
     87 #define SI_NO_DISCONNECT    0xff
     88 #define SI_NO_PARITY_CHK  0xff00
     89 #define SI_FORCE_POLLING 0x10000
     90 #define SI_DISABLE_DMA   0x20000
     91 /* The options are taken from the config file (PR#1929) */
     92 
     93 extern int si_debug;
     94 
     95 void si_attach __P((struct si_softc *));
     96 int  si_intr __P((void *));
     97 
     98 void si_dma_alloc __P((struct ncr5380_softc *));
     99 void si_dma_free __P((struct ncr5380_softc *));
    100 void si_dma_poll __P((struct ncr5380_softc *));
    101