sys/dev/ic/aic77xx.c

   1 /*      $NetBSD: aic77xx.c,v 1.7 2007/10/19 11:59:46 ad Exp $   */
   2
   3 /*
   4  * Common routines for AHA-27/284X and aic7770 motherboard SCSI controllers.
   5  *
   6  * Copyright (c) 1994, 1995, 1996, 1997, 1998 Justin T. Gibbs.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice immediately at the beginning of the file, without modification,
  14  *    this list of conditions, and the following disclaimer.
  15  * 2. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  * $FreeBSD: src/sys/dev/aic7xxx/ahc_eisa.c,v 1.15 2000/01/29 14:22:19 peter Exp $
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __KERNEL_RCSID(0, "$NetBSD: aic77xx.c,v 1.7 2007/10/19 11:59:46 ad Exp $");
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/device.h>
  39
  40 #include <sys/bus.h>
  41 #include <sys/intr.h>
  42
  43 #include <dev/scsipi/scsi_all.h>
  44 #include <dev/scsipi/scsipi_all.h>
  45 #include <dev/scsipi/scsiconf.h>
  46
  47 #include <dev/ic/aic7xxx_osm.h>
  48 #include <dev/ic/aic7xxx_inline.h>
  49 #include <dev/ic/aic77xxreg.h>
  50 #include <dev/ic/aic77xxvar.h>
  51
  52 /*
  53  * Return irq setting of the board, otherwise -1.
  54  */
  55 int
  56 ahc_aic77xx_irq(bus_space_tag_t iot, bus_space_handle_t ioh)
  57 {
  58         int irq;
  59         u_int8_t intdef;
  60         u_int8_t hcntrl;
  61
  62         /* Pause the card preseving the IRQ type */
  63         hcntrl = bus_space_read_1(iot, ioh, HCNTRL) & IRQMS;
  64         bus_space_write_1(iot, ioh, HCNTRL, hcntrl | PAUSE);
  65
  66         intdef = bus_space_read_1(iot, ioh, INTDEF);
  67         irq = (intdef & INTDEF_IRQ_MASK);
  68         switch (irq) {
  69         case 9:
  70         case 10:
  71         case 11:
  72         case 12:
  73         case 14:
  74         case 15:
  75                 break;
  76         default:
  77                 printf("ahc_aic77xx_irq: illegal irq setting %d\n", intdef);
  78                 return (-1);
  79         }
  80
  81         return (irq);
  82 }
  83
  84 int
  85 ahc_aic77xx_attach(struct ahc_softc *ahc)
  86 {
  87         u_int8_t sblkctl;
  88         u_int8_t sblkctl_orig;
  89         u_int8_t hostconf;
  90
  91         /*
  92          * See if we have a Rev E or higher aic7770. Anything below a
  93          * Rev E will have a R/O autoflush disable configuration bit.
  94          */
  95         sblkctl_orig = ahc_inb(ahc, SBLKCTL);
  96         sblkctl = sblkctl_orig ^ AUTOFLUSHDIS;
  97         ahc_outb(ahc, SBLKCTL, sblkctl);
  98         sblkctl = ahc_inb(ahc, SBLKCTL);
  99         if (sblkctl != sblkctl_orig) {
 100                 printf("%s: aic7770 >= Rev E: R/O autoflush enabled\n",
 101                     ahc_name(ahc));
 102                 /*
 103                  * Ensure autoflush is enabled
 104                  */
 105                 sblkctl &= ~AUTOFLUSHDIS;
 106                 ahc_outb(ahc, SBLKCTL, sblkctl);
 107         }
 108
 109         /* Setup the FIFO threshold and the bus off time */
 110         hostconf = ahc_inb(ahc, HOSTCONF);
 111         ahc_outb(ahc, BUSSPD, hostconf & DFTHRSH);
 112         ahc_outb(ahc, BUSTIME, (hostconf << 2) & BOFF);
 113
 114         /*
 115          * Generic aic7xxx initialization.
 116          */
 117         if (ahc_init(ahc)) {
 118                 /*
 119                  * The board's IRQ line is not yet enabled so it's safe
 120                  * to release the irq.
 121                  */
 122                 return (ENXIO);
 123         }
 124
 125         /*
 126          * Enable the board's BUS drivers
 127          */
 128         ahc_outb(ahc, BCTL, ENABLE);
 129
 130         /* Attach sub-devices - always succeeds */
 131         ahc_attach(ahc);
 132
 133         return 0;
 134 }