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/* aha152x.c -- Adaptec AHA-152x driver

 * Author: Jürgen E. Fischer, fischer@et-inf.fho-emden.de

 * Copyright 1993, 1994, 1995, 1996 Jürgen E. Fischer

 *

 *

 * This driver is based on

 *   fdomain.c -- Future Domain TMC-16x0 driver

 * which is

 *   Copyright 1992, 1993 Rickard E. Faith (faith@cs.unc.edu)

 *

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the

 * Free Software Foundation; either version 2, or (at your option) any

 * later version.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 *

 * $Id: aha152x.c,v 1.1.1.1 2001-09-10 07:44:30 simons Exp $

 *

 * $Log: not supported by cvs2svn $

 * Revision 1.1.1.1  2001/07/02 17:58:27  simons

 * Initial revision

 *

 * Revision 1.18  1996/09/07 20:10:40  fischer

 * - fixed can_queue handling (multiple outstanding commands working again)

 *

 * Revision 1.17  1996/08/17 16:05:14  fischer

 * - biosparam improved

 * - interrupt verification

 * - updated documentation

 * - cleanups

 *

 * Revision 1.16  1996/06/09 00:04:56  root

 * - added configuration symbols for insmod (aha152x/aha152x1)

 *

 * Revision 1.15  1996/04/30 14:52:06  fischer

 * - proc info fixed

 * - support for extended translation for >1GB disks

 *

 * Revision 1.14  1996/01/17  15:11:20  fischer

 * - fixed lockup in MESSAGE IN phase after reconnection

 *

 * Revision 1.13  1996/01/09  02:15:53  fischer

 * - some cleanups

 * - moved request_irq behind controller initialization

 *   (to avoid spurious interrupts)

 *

 * Revision 1.12  1995/12/16  12:26:07  fischer

 * - barrier()s added

 * - configurable RESET delay added

 *

 * Revision 1.11  1995/12/06  21:18:35  fischer

 * - some minor updates

 *

 * Revision 1.10  1995/07/22  19:18:45  fischer

 * - support for 2 controllers

 * - started synchronous data transfers (not working yet)

 *

 * Revision 1.9  1995/03/18  09:20:24  root

 * - patches for PCMCIA and modules

 *

 * Revision 1.8  1995/01/21  22:07:19  root

 * - snarf_region => request_region

 * - aha152x_intr interface change

 *

 * Revision 1.7  1995/01/02  23:19:36  root

 * - updated COMMAND_SIZE to cmd_len

 * - changed sti() to restore_flags()

 * - fixed some #ifdef which generated warnings

 *

 * Revision 1.6  1994/11/24  20:35:27  root

 * - problem with odd number of bytes in fifo fixed

 *

 * Revision 1.5  1994/10/30  14:39:56  root

 * - abort code fixed

 * - debugging improved

 *

 * Revision 1.4  1994/09/12  11:33:01  root

 * - irqaction to request_irq

 * - abortion updated

 *

 * Revision 1.3  1994/08/04  13:53:05  root

 * - updates for mid-level-driver changes

 * - accept unexpected BUSFREE phase as error condition

 * - parity check now configurable

 *

 * Revision 1.2  1994/07/03  12:56:36  root

 * - cleaned up debugging code

 * - more tweaking on reset delays

 * - updated abort/reset code (pretty untested...)

 *

 * Revision 1.1  1994/05/28  21:18:49  root

 * - update for mid-level interface change (abort-reset)

 * - delays after resets adjusted for some slow devices

 *

 * Revision 1.0  1994/03/25  12:52:00  root

 * - Fixed "more data than expected" problem

 * - added new BIOS signatures

 *

 * Revision 0.102  1994/01/31  20:44:12  root

 * - minor changes in insw/outsw handling

 *

 * Revision 0.101  1993/12/13  01:16:27  root

 * - fixed STATUS phase (non-GOOD stati were dropped sometimes;

 *   fixes problems with CD-ROM sector size detection & media change)

 *

 * Revision 0.100  1993/12/10  16:58:47  root

 * - fix for unsuccessful selections in case of non-continuous id assignments

 *   on the scsi bus.

 *

 * Revision 0.99  1993/10/24  16:19:59  root

 * - fixed DATA IN (rare read errors gone)

 *

 * Revision 0.98  1993/10/17  12:54:44  root

 * - fixed some recent fixes (shame on me)

 * - moved initialization of scratch area to aha152x_queue

 *

 * Revision 0.97  1993/10/09  18:53:53  root

 * - DATA IN fixed. Rarely left data in the fifo.

 *

 * Revision 0.96  1993/10/03  00:53:59  root

 * - minor changes on DATA IN

 *

 * Revision 0.95  1993/09/24  10:36:01  root

 * - change handling of MSGI after reselection

 * - fixed sti/cli

 * - minor changes

 *

 * Revision 0.94  1993/09/18  14:08:22  root

 * - fixed bug in multiple outstanding command code

 * - changed detection

 * - support for kernel command line configuration

 * - reset corrected

 * - changed message handling

 *

 * Revision 0.93  1993/09/15  20:41:19  root

 * - fixed bugs with multiple outstanding commands

 *

 * Revision 0.92  1993/09/13  02:46:33  root

 * - multiple outstanding commands work (no problems with IBM drive)

 *

 * Revision 0.91  1993/09/12  20:51:46  root

 * added multiple outstanding commands

 * (some problem with this $%&? IBM device remain)

 *

 * Revision 0.9  1993/09/12  11:11:22  root

 * - corrected auto-configuration

 * - changed the auto-configuration (added some '#define's)

 * - added support for dis-/reconnection

 *

 * Revision 0.8  1993/09/06  23:09:39  root

 * - added support for the drive activity light

 * - minor changes

 *

 * Revision 0.7  1993/09/05  14:30:15  root

 * - improved phase detection

 * - now using the new snarf_region code of 0.99pl13

 *

 * Revision 0.6  1993/09/02  11:01:38  root

 * first public release; added some signatures and biosparam()

 *

 * Revision 0.5  1993/08/30  10:23:30  root

 * fixed timing problems with my IBM drive

 *

 * Revision 0.4  1993/08/29  14:06:52  root

 * fixed some problems with timeouts due incomplete commands

 *

 * Revision 0.3  1993/08/28  15:55:03  root

 * writing data works too.  mounted and worked on a dos partition

 *

 * Revision 0.2  1993/08/27  22:42:07  root

 * reading data works.  Mounted a msdos partition.

 *

 * Revision 0.1  1993/08/25  13:38:30  root

 * first "damn thing doesn't work" version

 *

 * Revision 0.0  1993/08/14  19:54:25  root

 * empty function bodies; detect() works.

 *

 *

 **************************************************************************

 DESCRIPTION:

 This is the Linux low-level SCSI driver for Adaptec AHA-1520/1522 SCSI

 host adapters.

 CONFIGURATION ARGUMENTS:

  IOPORT        base io address                           (0x340/0x140)

  IRQ           interrupt level                           (9-12; default 11)

  SCSI_ID       scsi id of controller                     (0-7; default 7)

  RECONNECT     allow targets to disconnect from the bus  (0/1; default 1 [on])

  PARITY        enable parity checking                    (0/1; default 1 [on])

  SYNCHRONOUS   enable synchronous transfers              (0/1; default 0 [off])

                (NOT WORKING YET)

  DELAY:        bus reset delay                           (default 100)

  EXT_TRANS:    enable extended translation               (0/1: default 0 [off])

                (see NOTES below)

 COMPILE TIME CONFIGURATION (put into AHA152X in drivers/scsi/Makefile):

 -DAUTOCONF

   use configuration the controller reports (AHA-152x only)

 -DSKIP_BIOSTEST

   Don't test for BIOS signature (AHA-1510 or disabled BIOS)

 -DSETUP0="{ IOPORT, IRQ, SCSI_ID, RECONNECT, PARITY, SYNCHRONOUS, DELAY, EXT_TRANS }"

   override for the first controller

 -DSETUP1="{ IOPORT, IRQ, SCSI_ID, RECONNECT, PARITY, SYNCHRONOUS, DELAY, EXT_TRANS }"

   override for the second controller

 LILO COMMAND LINE OPTIONS:

 aha152x=<IOPORT>[,<IRQ>[,<SCSI-ID>[,<RECONNECT>[,<PARITY>[,<SYNCHRONOUS>[,<DELAY> [,<EXT_TRANS]]]]]]]

 The normal configuration can be overridden by specifying a command line.

 When you do this, the BIOS test is skipped. Entered values have to be

 valid (known).  Don't use values that aren't supported under normal

 operation.  If you think that you need other values: contact me.

 For two controllers use the aha152x statement twice.

 SYMBOLS FOR MODULE CONFIGURATION:

  aha152x=IOPORT,IRQ,SCSI_ID,RECONNECT,PARITY,SYNCHRONOUS,DELAY,EXT_TRANS

    configuration override of first controller

  aha152x1=IOPORT,IRQ,SCSI_ID,RECONNECT,PARITY,SYNCHRONOUS,DELAY,EXT_TRANS

    configuration override of second controller

 NOTES ON EXT_TRANS:

 SCSI uses block numbers to address blocks/sectors on a device.

 The BIOS uses a cylinder/head/sector addressing scheme (C/H/S)

 scheme instead.  DOS expects a BIOS or driver that understands this

 C/H/S addressing.

 The number of cylinders/heads/sectors is called geometry and is required

 as base for requests in C/H/S adressing.  SCSI only knows about the

 total capacity of disks in blocks (sectors).

 Therefore the SCSI BIOS/DOS driver has to calculate a logical/virtual

 geometry just to be able to support that addressing scheme.  The geometry

 returned by the SCSI BIOS is a pure calculation and has nothing to

 do with the real/physical geometry of the disk (which is usually

 irrelevant anyway).

 Basically this has no impact at all on Linux, because it also uses block

 instead of C/H/S addressing.  Unfortunately C/H/S addressing is also used

 in the partition table and therefore every operating system has to know

 the right geometry to be able to interpret it.

 Moreover there are certain limitations to the C/H/S addressing scheme,

 namely the address space is limited to upto 255 heads, upto 63 sectors

 and a maximum of 1023 cylinders.

 The AHA-1522 BIOS calculates the geometry by fixing the number of heads

 to 64, the number of sectors to 32 and by calculating the number of

 cylinders by dividing the capacity reported by the disk by 64*32 (1 MB).

 This is considered to be the default translation.

 With respect to the limit of 1023 cylinders using C/H/S you can only

 address the first GB of your disk in the partition table.  Therefore

 BIOSes of some newer controllers based on the AIC-6260/6360 support

 extended translation.  This means that the BIOS uses 255 for heads,

 63 for sectors and then divides the capacity of the disk by 255*63

 (about 8 MB), as soon it sees a disk greater than 1 GB.  That results

 in a maximum of about 8 GB adressable diskspace in the partition table

 (but there are already bigger disks out there today).

 To make it even more complicated the translation mode might/might

 not be configurable in certain BIOS setups.

 This driver does some more or less failsafe guessing to get the

 geometry right in most cases:

 - for disks<1GB: use default translation (C/32/64)

 - for disks>1GB:

   - take current geometry from the partition table

     (using scsicam_bios_param and accept only `valid' geometries,

      ie. either (C/32/64) or (C/63/255)).  This can be extended

      translation even if it's not enabled in the driver.

   - if that fails, take extended translation if enabled by override,

     kernel or module parameter, otherwise take default translation and

     ask the user for verification.  This might on not yet partitioned

     disks or

 REFERENCES USED:

 "AIC-6260 SCSI Chip Specification", Adaptec Corporation.

 "SCSI COMPUTER SYSTEM INTERFACE - 2 (SCSI-2)", X3T9.2/86-109 rev. 10h

 "Writing a SCSI device driver for Linux", Rik Faith (faith@cs.unc.edu)

 "Kernel Hacker's Guide", Michael K. Johnson (johnsonm@sunsite.unc.edu)

 "Adaptec 1520/1522 User's Guide", Adaptec Corporation.

 Michael K. Johnson (johnsonm@sunsite.unc.edu)

 Drew Eckhardt (drew@cs.colorado.edu)

 Eric Youngdale (ericy@cais.com)

 special thanks to Eric Youngdale for the free(!) supplying the

 documentation on the chip.

 **************************************************************************/

#ifdef PCMCIA

#define MODULE

#endif

#include <linux/module.h>

#ifdef PCMCIA

#undef MODULE

#endif

#include <linux/sched.h>

#include <asm/io.h>

#include <linux/blk.h>

#include "scsi.h"

#include "sd.h"

#include "hosts.h"

#include "constants.h"

#include <asm/system.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/wait.h>

#include <linux/ioport.h>

#include <linux/proc_fs.h>

#include "aha152x.h"

#include <linux/stat.h>

#include <scsi/scsicam.h>

struct proc_dir_entry proc_scsi_aha152x = {

    PROC_SCSI_AHA152X, 7, "aha152x",

    S_IFDIR | S_IRUGO | S_IXUGO, 2

};

/* DEFINES */

/* For PCMCIA cards, always use AUTOCONF */

#if defined(PCMCIA) || defined(MODULE)

#if !defined(AUTOCONF)

#define AUTOCONF

#endif

#endif

#if !defined(AUTOCONF) && !defined(SETUP0)

#error define AUTOCONF or SETUP0

#endif

#if defined(DEBUG_AHA152X)

#undef  SKIP_PORTS              /* don't display ports */

#undef  DEBUG_QUEUE             /* debug queue() */

#undef  DEBUG_RESET             /* debug reset() */

#undef  DEBUG_INTR              /* debug intr() */

#undef  DEBUG_SELECTION         /* debug selection part in intr() */

#undef  DEBUG_MSGO              /* debug message out phase in intr() */

#undef  DEBUG_MSGI              /* debug message in phase in intr() */

#undef  DEBUG_STATUS            /* debug status phase in intr() */

#undef  DEBUG_CMD               /* debug command phase in intr() */

#undef  DEBUG_DATAI             /* debug data in phase in intr() */

#undef  DEBUG_DATAO             /* debug data out phase in intr() */

#undef  DEBUG_ABORT             /* debug abort() */

#undef  DEBUG_DONE              /* debug done() */

#undef  DEBUG_BIOSPARAM         /* debug biosparam() */

#undef  DEBUG_RACE              /* debug race conditions */

#undef  DEBUG_PHASES            /* debug phases (useful to trace) */

#undef  DEBUG_QUEUES            /* debug reselection */

/* recently used for debugging */

#if 0

#endif

#define DEBUG_SELECTION

#define DEBUG_PHASES

#define DEBUG_RESET

#define DEBUG_ABORT

#define DEBUG_DEFAULT (debug_reset|debug_abort)

#endif

/* END OF DEFINES */

extern unsigned long loops_per_sec;

#define DELAY_DEFAULT 100

/* some additional "phases" for getphase() */

#define P_BUSFREE  1

#define P_PARITY   2

/* possible irq range */

#define IRQ_MIN 9

#define IRQ_MAX 12

#define IRQS    IRQ_MAX-IRQ_MIN+1

enum {

  not_issued   = 0x0001,

  in_selection = 0x0002,

  disconnected = 0x0004,

  aborted      = 0x0008,

  sent_ident   = 0x0010,

  in_other     = 0x0020,

  in_sync      = 0x0040,

  sync_ok      = 0x0080,

};

#if defined(MODULE)

#if defined(DEBUG_AHA152X)

int aha152x[]  = { 0, 11, 7, 1, 1, 0, DELAY_DEFAULT, 0, DEBUG_DEFAULT };

int aha152x1[] = { 0, 11, 7, 1, 1, 0, DELAY_DEFAULT, 0, DEBUG_DEFAULT };

#else

int aha152x[]  = { 0, 11, 7, 1, 1, 0, DELAY_DEFAULT, 0 };

int aha152x1[] = { 0, 11, 7, 1, 1, 0, DELAY_DEFAULT, 0 };

#endif

#endif

/* set by aha152x_setup according to the command line */

static int  setup_count=0;

static struct aha152x_setup {

  int io_port;

  int irq;

  int scsiid;

  int reconnect;

  int parity;

  int synchronous;

  int delay;

  int ext_trans;

#ifdef DEBUG_AHA152X

  int debug;

#endif

  char *conf;

} setup[2];

static struct Scsi_Host *aha152x_host[IRQS];

#define HOSTDATA(shpnt)   ((struct aha152x_hostdata *) &shpnt->hostdata)

#define CURRENT_SC        (HOSTDATA(shpnt)->current_SC)

#define ISSUE_SC          (HOSTDATA(shpnt)->issue_SC)

#define DISCONNECTED_SC   (HOSTDATA(shpnt)->disconnected_SC)

#define DELAY             (HOSTDATA(shpnt)->delay)

#define EXT_TRANS         (HOSTDATA(shpnt)->ext_trans)

#define SYNCRATE          (HOSTDATA(shpnt)->syncrate[CURRENT_SC->target])

#define MSG(i)            (HOSTDATA(shpnt)->message[i])

#define MSGLEN            (HOSTDATA(shpnt)->message_len)

#define ADDMSG(x)         (MSG(MSGLEN++)=x)

struct aha152x_hostdata {

  Scsi_Cmnd     *issue_SC;

  Scsi_Cmnd     *current_SC;

  Scsi_Cmnd     *disconnected_SC;

  int           aborting;

  int           abortion_complete;

  int           abort_result;

  int           commands;

  int           reconnect;

  int           parity;

  int           synchronous;

  int           delay;

  int           ext_trans;

  int           swint;

  unsigned char syncrate[8];

  unsigned char message[256];

  int           message_len;

#ifdef DEBUG_AHA152X

  int           debug;

#endif

};

void aha152x_intr(int irq, void *dev_id, struct pt_regs *);

void aha152x_done(struct Scsi_Host *shpnt, int error);

void aha152x_setup(char *str, int *ints);

int aha152x_checksetup(struct aha152x_setup *setup);

static void aha152x_reset_ports(struct Scsi_Host *shpnt);

static void aha152x_panic(struct Scsi_Host *shpnt, char *msg);

static void disp_ports(struct Scsi_Host *shpnt);

static void show_command(Scsi_Cmnd *ptr);

static void show_queues(struct Scsi_Host *shpnt);

static void disp_enintr(struct Scsi_Host *shpnt);

#if defined(DEBUG_RACE)

static void enter_driver(const char *);

static void leave_driver(const char *);

#endif

/* possible i/o addresses for the AIC-6260 */

static unsigned short ports[] =

{

  0x340,      /* default first */

  0x140

};

#define PORT_COUNT (sizeof(ports) / sizeof(unsigned short))

#if !defined(SKIP_BIOSTEST)

/* possible locations for the Adaptec BIOS */

static void *addresses[] =

{

  (void *) 0xdc000,   /* default first */

  (void *) 0xc8000,

  (void *) 0xcc000,

  (void *) 0xd0000,

  (void *) 0xd4000,

  (void *) 0xd8000,

  (void *) 0xe0000,

  (void *) 0xeb800,   /* VTech Platinum SMP */

  (void *) 0xf0000,

};

#define ADDRESS_COUNT (sizeof(addresses) / sizeof(void *))

/* signatures for various AIC-6[23]60 based controllers.

   The point in detecting signatures is to avoid useless and maybe

   harmful probes on ports. I'm not sure that all listed boards pass

   auto-configuration. For those which fail the BIOS signature is

   obsolete, because user intervention to supply the configuration is

   needed anyway.  May be an information whether or not the BIOS supports

   extended translation could be also useful here. */

static struct signature {

  char *signature;

  int  sig_offset;

  int  sig_length;

} signatures[] =

{

  { "Adaptec AHA-1520 BIOS",      0x102e, 21 },  /* Adaptec 152x */

  { "Adaptec AHA-1520B",            0x0b, 17 },  /* Adaptec 152x rev B */

  { "Adaptec AHA-1520B/1522B",    0x3e20, 23 },  /* Adaptec 1520B/1522B */

  { "Adaptec ASW-B626 BIOS",      0x1029, 21 },  /* on-board controller */

  { "Adaptec BIOS: ASW-B626",       0x0f, 22 },  /* on-board controller */

  { "Adaptec ASW-B626 S2",        0x2e6c, 19 },  /* on-board controller */

  { "Adaptec BIOS:AIC-6360",         0xc, 21 },  /* on-board controller */

  { "ScsiPro SP-360 BIOS",        0x2873, 19 },  /* ScsiPro-Controller  */

  { "GA-400 LOCAL BUS SCSI BIOS", 0x102e, 26 },  /* Gigabyte Local-Bus-SCSI */

  { "Adaptec BIOS:AVA-282X",         0xc, 21 },  /* Adaptec 282x */

  { "Adaptec IBM Dock II SCSI",   0x2edd, 24 },  /* IBM Thinkpad Dock II */

  { "Adaptec BIOS:AHA-1532P",       0x1c, 22 },  /* IBM Thinkpad Dock II SCSI */

};

#define SIGNATURE_COUNT (sizeof(signatures) / sizeof(struct signature))

#endif

static void do_pause(unsigned amount) /* Pause for amount*10 milliseconds */

{

   unsigned long the_time = jiffies + amount; /* 0.01 seconds per jiffy */

   while (jiffies < the_time)

     barrier();

}

/*

 *  queue services:

 */

static inline void append_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC)

{

  Scsi_Cmnd *end;

  new_SC->host_scribble = (unsigned char *) NULL;

  if(!*SC)

    *SC=new_SC;

  else {

    for(end=*SC; end->host_scribble; end = (Scsi_Cmnd *) end->host_scribble)

      ;

    end->host_scribble = (unsigned char *) new_SC;

  }

}

static inline Scsi_Cmnd *remove_first_SC(Scsi_Cmnd **SC)

{

  Scsi_Cmnd *ptr;

  ptr=*SC;

  if(ptr)

    *SC= (Scsi_Cmnd *) (*SC)->host_scribble;

  return ptr;

}

static inline Scsi_Cmnd *remove_SC(Scsi_Cmnd **SC, int target, int lun)

{

  Scsi_Cmnd *ptr, *prev;

  for(ptr=*SC, prev=NULL;

       ptr && ((ptr->target!=target) || (ptr->lun!=lun));

      prev = ptr, ptr = (Scsi_Cmnd *) ptr->host_scribble)

    ;

  if(ptr){

    if(prev)

      prev->host_scribble = ptr->host_scribble;

    else

      *SC= (Scsi_Cmnd *) ptr->host_scribble;

  }

  return ptr;

}

/*

 * read inbound byte and wait for ACK to get low

 */

static void make_acklow(struct Scsi_Host *shpnt)

{

  SETPORT(SXFRCTL0, CH1|SPIOEN);

  GETPORT(SCSIDAT);

  SETPORT(SXFRCTL0, CH1);

  while(TESTHI(SCSISIG, ACKI))

    barrier();

}

/*

 * detect current phase more reliable:

 * phase is valid, when the target asserts REQ after we've deasserted ACK.

 *

 * return value is a valid phase or an error code.

 *

 * errorcodes:

 *   P_BUSFREE   BUS FREE phase detected

 *   P_PARITY    parity error in DATA phase

 */

static int getphase(struct Scsi_Host *shpnt)

{

  int phase, sstat1;

  while(1) {

    do {

      while(!((sstat1 = GETPORT(SSTAT1)) & (BUSFREE|SCSIRSTI|REQINIT)))

        barrier();

      if(sstat1 & BUSFREE)

        return P_BUSFREE;

      if(sstat1 & SCSIRSTI) {

        printk("aha152x: RESET IN\n");

        SETPORT(SSTAT1, SCSIRSTI);

      }

    } while(TESTHI(SCSISIG, ACKI) || TESTLO(SSTAT1, REQINIT));

    SETPORT(SSTAT1, CLRSCSIPERR);

    phase = GETPORT(SCSISIG) & P_MASK ;

    if(TESTHI(SSTAT1, SCSIPERR)) {

      if((phase & (CDO|MSGO))==0)                        /* DATA phase */

        return P_PARITY;

      make_acklow(shpnt);

    } else

      return phase;

  }

}

/* called from init/main.c */

void aha152x_setup(char *str, int *ints)

{

  if(setup_count>2)

    panic("aha152x: you can only configure up to two controllers\n");

  setup[setup_count].conf        = str;

  setup[setup_count].io_port     = ints[0] >= 1 ? ints[1] : 0x340;

  setup[setup_count].irq         = ints[0] >= 2 ? ints[2] : 11;

  setup[setup_count].scsiid      = ints[0] >= 3 ? ints[3] : 7;

  setup[setup_count].reconnect   = ints[0] >= 4 ? ints[4] : 1;

  setup[setup_count].parity      = ints[0] >= 5 ? ints[5] : 1;

  setup[setup_count].synchronous = ints[0] >= 6 ? ints[6] : 0 /* FIXME: 1 */;

  setup[setup_count].delay       = ints[0] >= 7 ? ints[7] : DELAY_DEFAULT;

  setup[setup_count].ext_trans   = ints[0] >= 8 ? ints[8] : 0;

#ifdef DEBUG_AHA152X

  setup[setup_count].debug       = ints[0] >= 9 ? ints[9] : DEBUG_DEFAULT;

  if(ints[0]>9) {

    printk("aha152x: usage: aha152x=<IOBASE>[,<IRQ>[,<SCSI ID>"

           "[,<RECONNECT>[,<PARITY>[,<SYNCHRONOUS>[,<DELAY>[,<EXT_TRANS>[,<DEBUG>]]]]]]]]\n");

#else

  if(ints[0]>8) {

    printk("aha152x: usage: aha152x=<IOBASE>[,<IRQ>[,<SCSI ID>"

           "[,<RECONNECT>[,<PARITY>[,<SYNCHRONOUS>[,<DELAY>[,<EXT_TRANS>]]]]]]]\n");

#endif

  } else

    setup_count++;

}

/*

 * Test, if port_base is valid.

 */

static int aha152x_porttest(int io_port)

{

  int i;

  if(check_region(io_port, IO_RANGE))

    return 0;

  SETPORT(io_port+O_DMACNTRL1, 0);          /* reset stack pointer */

  for(i=0; i<16; i++)

    SETPORT(io_port+O_STACK, i);

  SETPORT(io_port+O_DMACNTRL1, 0);          /* reset stack pointer */

  for(i=0; i<16 && GETPORT(io_port+O_STACK)==i; i++)

    ;

  return(i==16);

}

int aha152x_checksetup(struct aha152x_setup *setup)

{

  int i;

#ifndef PCMCIA

  for(i=0; i<PORT_COUNT && (setup->io_port != ports[i]); i++)

    ;

  if(i==PORT_COUNT)

    return 0;

#endif

  if(!aha152x_porttest(setup->io_port))

    return 0;

  if(setup->irq<IRQ_MIN && setup->irq>IRQ_MAX)

    return 0;

  if((setup->scsiid < 0) || (setup->scsiid > 7))

    return 0;

  if((setup->reconnect < 0) || (setup->reconnect > 1))

    return 0;

  if((setup->parity < 0) || (setup->parity > 1))