sys/arch/mac68k/dev/sbcvar.h

   1 /*      $NetBSD: sbcvar.h,v 1.9.28.2 2005/03/08 13:53:09 skrll 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 /*
  42  * This structure is used to keep track of PDMA requests.
  43  */
  44 struct sbc_pdma_handle {
  45         int     dh_flags;       /* flags */
  46 #define SBC_DH_BUSY     0x01    /* This handle is in use */
  47 #define SBC_DH_OUT      0x02    /* PDMA data out (write) */
  48 #define SBC_DH_DONE     0x04    /* PDMA transfer is complete */
  49         u_char  *dh_addr;       /* data buffer */
  50         int     dh_len;         /* length of data buffer */
  51 };
  52
  53 /*
  54  * The first structure member has to be the ncr5380_softc
  55  * so we can just cast to go back and forth between them.
  56  */
  57 struct sbc_softc {
  58         struct ncr5380_softc ncr_sc;
  59         volatile struct sbc_regs *sc_regs;
  60         volatile vaddr_t        sc_drq_addr;
  61         volatile vaddr_t        sc_nodrq_addr;
  62         void                    (*sc_clrintr)(struct ncr5380_softc *);
  63         volatile int            sc_resid;
  64         int                     sc_options;     /* options for this instance. */
  65         struct sbc_pdma_handle sc_pdma[SCI_OPENINGS];
  66 };
  67
  68 /*
  69  * Options.  By default, SCSI interrupts and reselect are disabled.
  70  * You may enable either of these features with the `flags' directive
  71  * in your kernel's configuration file.
  72  *
  73  * Alternatively, you can patch your kernel with DDB or some other
  74  * mechanism.  The sc_options member of the softc is OR'd with
  75  * the value in sbc_options.
  76  *
  77  * The options code is based on the sparc 'si' driver's version of
  78  * the same.
  79  */
  80 #define SBC_PDMA        0x01    /* Use PDMA for polled transfers */
  81 #define SBC_INTR        0x02    /* Allow SCSI IRQ/DRQ interrupts */
  82 #define SBC_RESELECT    0x04    /* Allow disconnect/reselect */
  83 #define SBC_OPTIONS_MASK        (SBC_RESELECT|SBC_INTR|SBC_PDMA)
  84 #define SBC_OPTIONS_BITS        "\10\3RESELECT\2INTR\1PDMA"
  85
  86 extern int      sbc_debug;
  87 extern int      sbc_link_flags;
  88 extern int      sbc_options;
  89
  90 int     sbc_pdma_in(struct ncr5380_softc *, int, int, u_char *);
  91 int     sbc_pdma_out(struct ncr5380_softc *, int, int, u_char *);
  92 void    sbc_irq_intr(void *);
  93 void    sbc_drq_intr(void *);
  94 void    sbc_dma_alloc(struct ncr5380_softc *);
  95 void    sbc_dma_free(struct ncr5380_softc *);
  96 void    sbc_dma_poll(struct ncr5380_softc *);
  97 void    sbc_dma_setup(struct ncr5380_softc *);
  98 void    sbc_dma_start(struct ncr5380_softc *);
  99 void    sbc_dma_eop(struct ncr5380_softc *);
 100 void    sbc_dma_stop(struct ncr5380_softc *);
 101 #ifdef SBC_DEBUG
 102 void    decode_5380_intr(struct ncr5380_softc *);
 103 #endif