/*      $NetBSD: aic77xx.c,v 1.8 2009/03/14 15:36:17 dsl Exp $  */

/*
* Common routines for AHA-27/284X and aic7770 motherboard SCSI controllers.
*
* Copyright (c) 1994, 1995, 1996, 1997, 1998 Justin T. Gibbs.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice immediately at the beginning of the file, without modification,
*    this list of conditions, and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/sys/dev/aic7xxx/ahc_eisa.c,v 1.15 2000/01/29 14:22:19 peter Exp $
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: aic77xx.c,v 1.8 2009/03/14 15:36:17 dsl Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <sys/bus.h>
#include <sys/intr.h>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>

#include <dev/ic/aic7xxx_osm.h>
#include <dev/ic/aic7xxx_inline.h>
#include <dev/ic/aic77xxreg.h>
#include <dev/ic/aic77xxvar.h>

/*
* Return irq setting of the board, otherwise -1.
*/
int
ahc_aic77xx_irq(bus_space_tag_t iot, bus_space_handle_t ioh)
{
       int irq;
       u_int8_t intdef;
       u_int8_t hcntrl;

       /* Pause the card preseving the IRQ type */
       hcntrl = bus_space_read_1(iot, ioh, HCNTRL) & IRQMS;
       bus_space_write_1(iot, ioh, HCNTRL, hcntrl | PAUSE);

       intdef = bus_space_read_1(iot, ioh, INTDEF);
       irq = (intdef & INTDEF_IRQ_MASK);
       switch (irq) {
       case 9:
       case 10:
       case 11:
       case 12:
       case 14:
       case 15:
               break;
       default:
               printf("ahc_aic77xx_irq: illegal irq setting %d\n", intdef);
               return (-1);
       }

       return (irq);
}

int
ahc_aic77xx_attach(struct ahc_softc *ahc)
{
       u_int8_t sblkctl;
       u_int8_t sblkctl_orig;
       u_int8_t hostconf;

       /*
        * See if we have a Rev E or higher aic7770. Anything below a
        * Rev E will have a R/O autoflush disable configuration bit.
        */
       sblkctl_orig = ahc_inb(ahc, SBLKCTL);
       sblkctl = sblkctl_orig ^ AUTOFLUSHDIS;
       ahc_outb(ahc, SBLKCTL, sblkctl);
       sblkctl = ahc_inb(ahc, SBLKCTL);
       if (sblkctl != sblkctl_orig) {
               printf("%s: aic7770 >= Rev E: R/O autoflush enabled\n",
                   ahc_name(ahc));
               /*
                * Ensure autoflush is enabled
                */
               sblkctl &= ~AUTOFLUSHDIS;
               ahc_outb(ahc, SBLKCTL, sblkctl);
       }

       /* Setup the FIFO threshold and the bus off time */
       hostconf = ahc_inb(ahc, HOSTCONF);
       ahc_outb(ahc, BUSSPD, hostconf & DFTHRSH);
       ahc_outb(ahc, BUSTIME, (hostconf << 2) & BOFF);

       /*
        * Generic aic7xxx initialization.
        */
       if (ahc_init(ahc)) {
               /*
                * The board's IRQ line is not yet enabled so it's safe
                * to release the irq.
                */
               return (ENXIO);
       }

       /*
        * Enable the board's BUS drivers
        */
       ahc_outb(ahc, BCTL, ENABLE);

       /* Attach sub-devices - always succeeds */
       ahc_attach(ahc);

       return 0;
}