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sbcvar.h revision 1.2.4.2 
      1 /*	$NetBSD: sbcvar.h,v 1.2.4.2 1997/10/14 10:17:03 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1996 Scott Reynolds.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 /*
     30  * Transfers smaller than this are done using PIO
     31  * (on assumption they're not worth PDMA overhead)
     32  */
     33 #define	MIN_DMA_LEN 128
     34 
     35 /*
     36  * Transfers larger than 8192 bytes need to be split up
     37  * due to the size of the PDMA space.
     38  */
     39 #define	MAX_DMA_LEN 0x2000
     40 
     41 #ifdef SBC_DEBUG
     42 # define	SBC_DB_INTR	0x01
     43 # define	SBC_DB_DMA	0x02
     44 # define	SBC_DB_REG	0x04
     45 # define	SBC_DB_BREAK	0x08
     46 # ifndef DDB
     47 #  define	Debugger()	printf("Debug: sbc.c:%d\n", __LINE__)
     48 # endif
     49 # define	SBC_BREAK \
     50 		do { if (sbc_debug & SBC_DB_BREAK) Debugger(); } while (0)
     51 #else
     52 # define	SBC_BREAK
     53 #endif
     54 
     55 /*
     56  * This structure is used to keep track of PDMA requests.
     57  */
     58 struct sbc_pdma_handle {
     59 	int	dh_flags;	/* flags */
     60 #define	SBC_DH_BUSY	0x01	/* This handle is in use */
     61 #define	SBC_DH_OUT	0x02	/* PDMA data out (write) */
     62 #define	SBC_DH_DONE	0x04	/* PDMA transfer is complete */
     63 	u_char	*dh_addr;	/* data buffer */
     64 	int	dh_len;		/* length of data buffer */
     65 };
     66 
     67 /*
     68  * The first structure member has to be the ncr5380_softc
     69  * so we can just cast to go back and forth between them.
     70  */
     71 struct sbc_softc {
     72 	struct ncr5380_softc ncr_sc;
     73 	volatile struct sbc_regs *sc_regs;
     74 	volatile vm_offset_t	sc_drq_addr;
     75 	volatile vm_offset_t	sc_nodrq_addr;
     76 	void			(*sc_clrintr) __P((struct ncr5380_softc *));
     77 	int			sc_options;	/* options for this instance. */
     78 	struct sbc_pdma_handle sc_pdma[SCI_OPENINGS];
     79 };
     80 
     81 /*
     82  * Options.  By default, SCSI interrupts and reselect are disabled.
     83  * You may enable either of these features with the `flags' directive
     84  * in your kernel's configuration file.
     85  *
     86  * Alternatively, you can patch your kernel with DDB or some other
     87  * mechanism.  The sc_options member of the softc is OR'd with
     88  * the value in sbc_options.
     89  *
     90  * The options code is based on the sparc 'si' driver's version of
     91  * the same.
     92  */
     93 #define	SBC_PDMA	0x01	/* Use PDMA for polled transfers */
     94 #define	SBC_INTR	0x02	/* Allow SCSI IRQ/DRQ interrupts */
     95 #define	SBC_RESELECT	0x04	/* Allow disconnect/reselect */
     96 #define	SBC_OPTIONS_MASK	(SBC_RESELECT|SBC_INTR|SBC_PDMA)
     97 #define	SBC_OPTIONS_BITS	"\10\3RESELECT\2INTR\1PDMA"
     98 
     99 extern int	sbc_debug;
    100 extern int	sbc_link_flags;
    101 extern int	sbc_options;
    102 extern struct scsipi_adapter sbc_ops;
    103 extern struct scsipi_device sbc_dev;
    104 
    105 int	sbc_pdma_in __P((struct ncr5380_softc *, int, int, u_char *));
    106 int	sbc_pdma_out __P((struct ncr5380_softc *, int, int, u_char *));
    107 void	sbc_irq_intr __P((void *));
    108 void	sbc_drq_intr __P((void *));
    109 void	sbc_dma_alloc __P((struct ncr5380_softc *));
    110 void	sbc_dma_free __P((struct ncr5380_softc *));
    111 void	sbc_dma_poll __P((struct ncr5380_softc *));
    112 void	sbc_dma_setup __P((struct ncr5380_softc *));
    113 void	sbc_dma_start __P((struct ncr5380_softc *));
    114 void	sbc_dma_eop __P((struct ncr5380_softc *));
    115 void	sbc_dma_stop __P((struct ncr5380_softc *));
    116 #ifdef SBC_DEBUG
    117 void	decode_5380_intr __P((struct ncr5380_softc *));
    118 #endif
    119