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      1 /*	$NetBSD: aic77xx.c,v 1.8 2009/03/14 15:36:17 dsl 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 1.8 2009/03/14 15:36:17 dsl 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 }
    135