Home | History | Annotate | Line # | Download | only in dev
sbcvar.h revision 1.3 
      1 /*	$NetBSD: sbcvar.h,v 1.3 1997/08/27 11:23:54 bouyer 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. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Scott Reynolds for
     17  *      the NetBSD Project.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * Transfers smaller than this are done using PIO
     35  * (on assumption they're not worth PDMA overhead)
     36  */
     37 #define	MIN_DMA_LEN 128
     38 
     39 /*
     40  * Transfers larger than 8192 bytes need to be split up
     41  * due to the size of the PDMA space.
     42  */
     43 #define	MAX_DMA_LEN 0x2000
     44 
     45 #ifdef SBC_DEBUG
     46 # define	SBC_DB_INTR	0x01
     47 # define	SBC_DB_DMA	0x02
     48 # define	SBC_DB_REG	0x04
     49 # define	SBC_DB_BREAK	0x08
     50 # ifndef DDB
     51 #  define	Debugger()	printf("Debug: sbc.c:%d\n", __LINE__)
     52 # endif
     53 # define	SBC_BREAK \
     54 		do { if (sbc_debug & SBC_DB_BREAK) Debugger(); } while (0)
     55 #else
     56 # define	SBC_BREAK
     57 #endif
     58 
     59 /*
     60  * This structure is used to keep track of PDMA requests.
     61  */
     62 struct sbc_pdma_handle {
     63 	int	dh_flags;	/* flags */
     64 #define	SBC_DH_BUSY	0x01	/* This handle is in use */
     65 #define	SBC_DH_OUT	0x02	/* PDMA data out (write) */
     66 #define	SBC_DH_DONE	0x04	/* PDMA transfer is complete */
     67 	u_char	*dh_addr;	/* data buffer */
     68 	int	dh_len;		/* length of data buffer */
     69 };
     70 
     71 /*
     72  * The first structure member has to be the ncr5380_softc
     73  * so we can just cast to go back and forth between them.
     74  */
     75 struct sbc_softc {
     76 	struct ncr5380_softc ncr_sc;
     77 	volatile struct sbc_regs *sc_regs;
     78 	volatile vm_offset_t	sc_drq_addr;
     79 	volatile vm_offset_t	sc_nodrq_addr;
     80 	void			(*sc_clrintr) __P((struct ncr5380_softc *));
     81 	int			sc_options;	/* options for this instance. */
     82 	struct sbc_pdma_handle sc_pdma[SCI_OPENINGS];
     83 };
     84 
     85 /*
     86  * Options.  By default, SCSI interrupts and reselect are disabled.
     87  * You may enable either of these features with the `flags' directive
     88  * in your kernel's configuration file.
     89  *
     90  * Alternatively, you can patch your kernel with DDB or some other
     91  * mechanism.  The sc_options member of the softc is OR'd with
     92  * the value in sbc_options.
     93  *
     94  * The options code is based on the sparc 'si' driver's version of
     95  * the same.
     96  */
     97 #define	SBC_PDMA	0x01	/* Use PDMA for polled transfers */
     98 #define	SBC_INTR	0x02	/* Allow SCSI IRQ/DRQ interrupts */
     99 #define	SBC_RESELECT	0x04	/* Allow disconnect/reselect */
    100 #define	SBC_OPTIONS_MASK	(SBC_RESELECT|SBC_INTR|SBC_PDMA)
    101 #define	SBC_OPTIONS_BITS	"\10\3RESELECT\2INTR\1PDMA"
    102 
    103 extern int	sbc_debug;
    104 extern int	sbc_link_flags;
    105 extern int	sbc_options;
    106 extern struct scsipi_adapter sbc_ops;
    107 extern struct scsipi_device sbc_dev;
    108 
    109 int	sbc_pdma_in __P((struct ncr5380_softc *, int, int, u_char *));
    110 int	sbc_pdma_out __P((struct ncr5380_softc *, int, int, u_char *));
    111 void	sbc_irq_intr __P((void *));
    112 void	sbc_drq_intr __P((void *));
    113 void	sbc_dma_alloc __P((struct ncr5380_softc *));
    114 void	sbc_dma_free __P((struct ncr5380_softc *));
    115 void	sbc_dma_poll __P((struct ncr5380_softc *));
    116 void	sbc_dma_setup __P((struct ncr5380_softc *));
    117 void	sbc_dma_start __P((struct ncr5380_softc *));
    118 void	sbc_dma_eop __P((struct ncr5380_softc *));
    119 void	sbc_dma_stop __P((struct ncr5380_softc *));
    120 #ifdef SBC_DEBUG
    121 void	decode_5380_intr __P((struct ncr5380_softc *));
    122 #endif
    123