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      1 /*	$NetBSD: sivar.h,v 1.12 2023/01/23 22:16:44 andvar 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * This file defines the interface between si.c and
     34  * the bus-specific files: si_obio.c, si_vme.c
     35  */
     36 
     37 /*
     38  * Transfers smaller than this are done using PIO
     39  * (on assumption they're not worth DMA overhead)
     40  */
     41 #define	MIN_DMA_LEN 128
     42 
     43 /*
     44  * Transfers larger than 65535 bytes need to be split-up.
     45  * (Some of the FIFO logic has only 16 bits counters.)
     46  * Make the size an integer multiple of the page size
     47  * to avoid buf/cluster remap problems.  (paranoid?)
     48  */
     49 #define	MAX_DMA_LEN 0xE000
     50 
     51 /*
     52  * This structure is used to keep track of mapped DMA requests.
     53  */
     54 struct si_dma_handle {
     55 	int 		dh_flags;
     56 #define	SIDH_BUSY	1		/* This DH is in use */
     57 #define	SIDH_OUT	2		/* DMA does data out (write) */
     58 	vaddr_t		dh_dmaaddr;	/* VA of buffer in DVMA space */
     59 	vsize_t		dh_dmalen;	/* Length of KVA mapping. */
     60 };
     61 
     62 /*
     63  * The first structure member has to be the ncr5380_softc
     64  * so we can just cast to go back and fourth between them.
     65  */
     66 struct si_softc {
     67 	struct ncr5380_softc	ncr_sc;
     68 	bus_space_tag_t		sc_bst;
     69 	bus_space_handle_t	sc_bsh;
     70 	volatile struct si_regs	*sc_regs;
     71 	bus_dma_tag_t		sc_dmat;
     72 	bus_dmamap_t		sc_dmap;
     73 	int		sc_adapter_type;
     74 	int		sc_adapter_iv_am;	/* int. vec + address modifier */
     75 	int 	sc_options;			/* options for this instance */
     76 	int 	sc_reqlen;  		/* requested transfer length */
     77 	struct si_dma_handle *sc_dma;
     78 	/* DMA command block for the OBIO controller. */
     79 	void *sc_dmacmd;
     80 };
     81 
     82 /* Options for disconnect/reselect, DMA, and interrupts. */
     83 #define SI_NO_DISCONNECT    0xff
     84 #define SI_NO_PARITY_CHK  0xff00
     85 #define SI_FORCE_POLLING 0x10000
     86 #define SI_DISABLE_DMA   0x20000
     87 /* The options are taken from the config file (PR#1929) */
     88 
     89 extern int si_debug;
     90 
     91 void si_attach(struct si_softc *);
     92 int  si_intr(void *);
     93 
     94 void si_dma_alloc(struct ncr5380_softc *);
     95 void si_dma_free(struct ncr5380_softc *);
     96 void si_dma_poll(struct ncr5380_softc *);
     97