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

 * Created: Sun May  3 18:53:19 1992 by faith@cs.unc.edu

 * Revised: Sat Nov  2 09:27:47 1996 by root@cs.unc.edu

 * Author: Rickard E. Faith, faith@cs.unc.edu

 * Copyright 1992, 1993, 1994, 1995, 1996 Rickard E. Faith

 *

 * $Id: fdomain.c,v 1.1 2005-12-20 10:17:45 jcastillo Exp $

 * 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.

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 675 Mass Ave, Cambridge, MA 02139, USA.

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

 SUMMARY:

 Future Domain BIOS versions supported for autodetect:

    2.0, 3.0, 3.2, 3.4 (1.0), 3.5 (2.0), 3.6, 3.61

 Chips are supported:

    TMC-1800, TMC-18C50, TMC-18C30, TMC-36C70

 Boards supported:

    Future Domain TMC-1650, TMC-1660, TMC-1670, TMC-1680, TMC-1610M/MER/MEX

    Future Domain TMC-3260 (PCI)

    Quantum ISA-200S, ISA-250MG

    Adaptec AHA-2920 (PCI)

    IBM ?

 LILO command-line options:

    fdomain=<PORT_BASE>,<IRQ>[,<ADAPTER_ID>]

 DESCRIPTION:

 This is the Linux low-level SCSI driver for Future Domain TMC-1660/1680

 TMC-1650/1670, and TMC-3260 SCSI host adapters.  The 1650 and 1670 have a

 25-pin external connector, whereas the 1660 and 1680 have a SCSI-2 50-pin

 high-density external connector.  The 1670 and 1680 have floppy disk

 controllers built in.  The TMC-3260 is a PCI bus card.

 Future Domain's older boards are based on the TMC-1800 chip, and this

 driver was originally written for a TMC-1680 board with the TMC-1800 chip.

 More recently, boards are being produced with the TMC-18C50 and TMC-18C30

 chips.  The latest and greatest board may not work with this driver.  If

 you have to patch this driver so that it will recognize your board's BIOS

 signature, then the driver may fail to function after the board is

 detected.

 Please note that the drive ordering that Future Domain implemented in BIOS

 versions 3.4 and 3.5 is the opposite of the order (currently) used by the

 rest of the SCSI industry.  If you have BIOS version 3.4 or 3.5, and have

 more then one drive, then the drive ordering will be the reverse of that

 which you see under DOS.  For example, under DOS SCSI ID 0 will be D: and

 SCSI ID 1 will be C: (the boot device).  Under Linux, SCSI ID 0 will be

 /dev/sda and SCSI ID 1 will be /dev/sdb.  The Linux ordering is consistent

 with that provided by all the other SCSI drivers for Linux.  If you want

 this changed, you will probably have to patch the higher level SCSI code.

 If you do so, please send me patches that are protected by #ifdefs.

 If you have a TMC-8xx or TMC-9xx board, then this is not the driver for

 your board.  Please refer to the Seagate driver for more information and

 possible support.

 HISTORY:

 Linux       Driver      Driver

 Version     Version     Date         Support/Notes

             0.0          3 May 1992  V2.0 BIOS; 1800 chip

 0.97        1.9         28 Jul 1992

 0.98.6      3.1         27 Nov 1992

 0.99        3.2          9 Dec 1992

 0.99.3      3.3         10 Jan 1993  V3.0 BIOS

 0.99.5      3.5         18 Feb 1993

 0.99.10     3.6         15 May 1993  V3.2 BIOS; 18C50 chip

 0.99.11     3.17         3 Jul 1993  (now under RCS)

 0.99.12     3.18        13 Aug 1993

 0.99.14     5.6         31 Oct 1993  (reselection code removed)

 0.99.15     5.9         23 Jan 1994  V3.4 BIOS (preliminary)

 1.0.8/1.1.1 5.15         1 Apr 1994  V3.4 BIOS; 18C30 chip (preliminary)

 1.0.9/1.1.3 5.16         7 Apr 1994  V3.4 BIOS; 18C30 chip

 1.1.38      5.18        30 Jul 1994  36C70 chip (PCI version of 18C30)

 1.1.62      5.20         2 Nov 1994  V3.5 BIOS

 1.1.73      5.22         7 Dec 1994  Quantum ISA-200S board; V2.0 BIOS

 1.1.82      5.26        14 Jan 1995  V3.5 BIOS; TMC-1610M/MER/MEX board

 1.2.10      5.28         5 Jun 1995  Quantum ISA-250MG board; V2.0, V2.01 BIOS

 1.3.4       5.31        23 Jun 1995  PCI BIOS-32 detection (preliminary)

 1.3.7       5.33         4 Jul 1995  PCI BIOS-32 detection

 1.3.28      5.36        17 Sep 1995  V3.61 BIOS; LILO command-line support

 1.3.34      5.39        12 Oct 1995  V3.60 BIOS; /proc

 1.3.72      5.39         8 Feb 1996  Adaptec AHA-2920 board

 1.3.85      5.41         4 Apr 1996

 2.0.12      5.44         8 Aug 1996  Use ID 7 for all PCI cards

 REFERENCES USED:

 "TMC-1800 SCSI Chip Specification (FDC-1800T)", Future Domain Corporation,

 1990.

 "Technical Reference Manual: 18C50 SCSI Host Adapter Chip", Future Domain

 Corporation, January 1992.

 "LXT SCSI Products: Specifications and OEM Technical Manual (Revision

 B/September 1991)", Maxtor Corporation, 1991.

 "7213S product Manual (Revision P3)", Maxtor Corporation, 1992.

 "Draft Proposed American National Standard: Small Computer System

 Interface - 2 (SCSI-2)", Global Engineering Documents. (X3T9.2/86-109,

 revision 10h, October 17, 1991)

 Private communications, Drew Eckhardt (drew@cs.colorado.edu) and Eric

 Youngdale (ericy@cais.com), 1992.

 Private communication, Tuong Le (Future Domain Engineering department),

 1994. (Disk geometry computations for Future Domain BIOS version 3.4, and

 TMC-18C30 detection.)

 Hogan, Thom. The Programmer's PC Sourcebook. Microsoft Press, 1988. Page

 60 (2.39: Disk Partition Table Layout).

 "18C30 Technical Reference Manual", Future Domain Corporation, 1993, page

 6-1.

 NOTES ON REFERENCES:

 The Maxtor manuals were free.  Maxtor telephone technical support is

 great!

 The Future Domain manuals were $25 and $35.  They document the chip, not

 the TMC-16x0 boards, so some information I had to guess at.  In 1992,

 Future Domain sold DOS BIOS source for $250 and the UN*X driver source was

 $750, but these required a non-disclosure agreement, so even if I could

 have afforded them, they would *not* have been useful for writing this

 publically distributable driver.  Future Domain technical support has

 provided some information on the phone and have sent a few useful FAXs.

 They have been much more helpful since they started to recognize that the

 word "Linux" refers to an operating system :-).

 ALPHA TESTERS:

 There are many other alpha testers that come and go as the driver

 develops.  The people listed here were most helpful in times of greatest

 need (mostly early on -- I've probably left out a few worthy people in

 more recent times):

 Todd Carrico (todd@wutc.wustl.edu), Dan Poirier (poirier@cs.unc.edu ), Ken

 Corey (kenc@sol.acs.unt.edu), C. de Bruin (bruin@bruin@sterbbs.nl), Sakari

 Aaltonen (sakaria@vipunen.hit.fi), John Rice (rice@xanth.cs.odu.edu), Brad

 Yearwood (brad@optilink.com), and Ray Toy (toy@soho.crd.ge.com).

 Special thanks to Tien-Wan Yang (twyang@cs.uh.edu), who graciously lent me

 his 18C50-based card for debugging.  He is the sole reason that this

 driver works with the 18C50 chip.

 Thanks to Dave Newman (dnewman@crl.com) for providing initial patches for

 the version 3.4 BIOS.

 Thanks to James T. McKinley (mckinley@msupa.pa.msu.edu) for providing

 patches that support the TMC-3260, a PCI bus card with the 36C70 chip.

 The 36C70 chip appears to be "completely compatible" with the 18C30 chip.

 Thanks to Eric Kasten (tigger@petroglyph.cl.msu.edu) for providing the

 patch for the version 3.5 BIOS.

 Thanks for Stephen Henson (shenson@nyx10.cs.du.edu) for providing the

 patch for the Quantum ISA-200S SCSI adapter.

 Thanks to Adam Bowen for the signature to the 1610M/MER/MEX scsi cards, to

 Martin Andrews (andrewm@ccfadm.eeg.ccf.org) for the signature to some

 random TMC-1680 repackaged by IBM; and to Mintak Ng (mintak@panix.com) for

 the version 3.61 BIOS signature.

 Thanks for Mark Singer (elf@netcom.com) and Richard Simpson

 (rsimpson@ewrcsdra.demon.co.uk) for more Quantum signatures and detective

 work on the Quantum RAM layout.

 Special thanks to James T. McKinley (mckinley@msupa.pa.msu.edu) for

 providing patches for proper PCI BIOS32-mediated detection of the TMC-3260

 card (a PCI bus card with the 36C70 chip).  Please send James PCI-related

 bug reports.

 Thanks to Tom Cavin (tec@usa1.com) for preliminary command-line option

 patches.

 All of the alpha testers deserve much thanks.

 NOTES ON USER DEFINABLE OPTIONS:

 DEBUG: This turns on the printing of various debug information.

 ENABLE_PARITY: This turns on SCSI parity checking.  With the current

 driver, all attached devices must support SCSI parity.  If none of your

 devices support parity, then you can probably get the driver to work by

 turning this option off.  I have no way of testing this, however, and it

 would appear that no one ever uses this option.

 FIFO_COUNT: The host adapter has an 8K cache (host adapters based on the

 18C30 chip have a 2k cache).  When this many 512 byte blocks are filled by

 the SCSI device, an interrupt will be raised.  Therefore, this could be as

 low as 0, or as high as 16.  Note, however, that values which are too high

 or too low seem to prevent any interrupts from occurring, and thereby lock

 up the machine.  I have found that 2 is a good number, but throughput may

 be increased by changing this value to values which are close to 2.

 Please let me know if you try any different values.

 DO_DETECT: This activates some old scan code which was needed before the

 high level drivers got fixed.  If you are having trouble with the driver,

 turning this on should not hurt, and might help.  Please let me know if

 this is the case, since this code will be removed from future drivers.

 RESELECTION: This is no longer an option, since I gave up trying to

 implement it in version 4.x of this driver.  It did not improve

 performance at all and made the driver unstable (because I never found one

 of the two race conditions which were introduced by the multiple

 outstanding command code).  The instability seems a very high price to pay

 just so that you don't have to wait for the tape to rewind.  If you want

 this feature implemented, send me patches.  I'll be happy to send a copy

 of my (broken) driver to anyone who would like to see a copy.

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

#ifdef PCMCIA

#define MODULE

#endif

#ifdef MODULE

#include <linux/module.h>

#endif

#ifdef PCMCIA

#undef MODULE

#endif

#include <linux/sched.h>

#include <asm/io.h>

#include <linux/blk.h>

#include "scsi.h"

#include "hosts.h"

#include "fdomain.h"

#include <asm/system.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/ioport.h>

#include <linux/proc_fs.h>

#include <linux/bios32.h>

#include <linux/pci.h>

#include <linux/stat.h>

#include <linux/config.h>       /* for CONFIG_PCI */

struct proc_dir_entry proc_scsi_fdomain = {

    PROC_SCSI_FDOMAIN, 7, "fdomain",

    S_IFDIR | S_IRUGO | S_IXUGO, 2

};

#define VERSION          "$Revision: 1.1 $"

/* START OF USER DEFINABLE OPTIONS */

#define DEBUG            1      /* Enable debugging output */

#define ENABLE_PARITY    1      /* Enable SCSI Parity */

#define FIFO_COUNT       2      /* Number of 512 byte blocks before INTR */

#define DO_DETECT        0      /* Do device detection here (see scsi.c) */

/* END OF USER DEFINABLE OPTIONS */

#if DEBUG

#define EVERY_ACCESS     0      /* Write a line on every scsi access */

#define ERRORS_ONLY      1      /* Only write a line if there is an error */

#define DEBUG_DETECT     0      /* Debug fdomain_16x0_detect() */

#define DEBUG_MESSAGES   1      /* Debug MESSAGE IN phase */

#define DEBUG_ABORT      1      /* Debug abort() routine */

#define DEBUG_RESET      1      /* Debug reset() routine */

#define DEBUG_RACE       1      /* Debug interrupt-driven race condition */

#else

#define EVERY_ACCESS     0      /* LEAVE THESE ALONE--CHANGE THE ONES ABOVE */

#define ERRORS_ONLY      0

#define DEBUG_DETECT     0

#define DEBUG_MESSAGES   0

#define DEBUG_ABORT      0

#define DEBUG_RESET      0

#define DEBUG_RACE       0

#endif

/* Errors are reported on the line, so we don't need to report them again */

#if EVERY_ACCESS

#undef ERRORS_ONLY

#define ERRORS_ONLY      0

#endif

#if ENABLE_PARITY

#define PARITY_MASK      0x08

#else

#define PARITY_MASK      0x00

#endif

enum chip_type {

   unknown          = 0x00,

   tmc1800          = 0x01,

   tmc18c50         = 0x02,

   tmc18c30         = 0x03,

};

enum {

   in_arbitration   = 0x02,

   in_selection     = 0x04,

   in_other         = 0x08,

   disconnect       = 0x10,

   aborted          = 0x20,

   sent_ident       = 0x40,

};

enum in_port_type {

   Read_SCSI_Data   =  0,

   SCSI_Status      =  1,

   TMC_Status       =  2,

   FIFO_Status      =  3,       /* tmc18c50/tmc18c30 only */

   Interrupt_Cond   =  4,       /* tmc18c50/tmc18c30 only */

   LSB_ID_Code      =  5,

   MSB_ID_Code      =  6,

   Read_Loopback    =  7,

   SCSI_Data_NoACK  =  8,

   Interrupt_Status =  9,

   Configuration1   = 10,

   Configuration2   = 11,       /* tmc18c50/tmc18c30 only */

   Read_FIFO        = 12,

   FIFO_Data_Count  = 14

};

enum out_port_type {

   Write_SCSI_Data  =  0,

   SCSI_Cntl        =  1,

   Interrupt_Cntl   =  2,

   SCSI_Mode_Cntl   =  3,

   TMC_Cntl         =  4,

   Memory_Cntl      =  5,       /* tmc18c50/tmc18c30 only */

   Write_Loopback   =  7,

   IO_Control       = 11,       /* tmc18c30 only */

   Write_FIFO       = 12

};

static int               port_base         = 0;

static void              *bios_base        = NULL;

static int               bios_major        = 0;

static int               bios_minor        = 0;

static int               PCI_bus           = 0;

static int               Quantum           = 0;  /* Quantum board variant */

static int               interrupt_level   = 0;

static volatile int      in_command        = 0;

static Scsi_Cmnd         *current_SC       = NULL;

static enum chip_type    chip              = unknown;

static int               adapter_mask      = 0;

static int               this_id           = 0;

static int               setup_called      = 0;

#if DEBUG_RACE

static volatile int      in_interrupt_flag = 0;

#endif

static int               SCSI_Mode_Cntl_port;

static int               FIFO_Data_Count_port;

static int               Interrupt_Cntl_port;

static int               Interrupt_Status_port;

static int               Read_FIFO_port;

static int               Read_SCSI_Data_port;

static int               SCSI_Cntl_port;

static int               SCSI_Data_NoACK_port;

static int               SCSI_Status_port;

static int               TMC_Cntl_port;

static int               TMC_Status_port;

static int               Write_FIFO_port;

static int               Write_SCSI_Data_port;

static int               FIFO_Size = 0x2000; /* 8k FIFO for

                                                pre-tmc18c30 chips */

extern void              fdomain_16x0_intr( int irq, void *dev_id, struct pt_regs * regs );

static void *addresses[] = {

   (void *)0xc8000,

   (void *)0xca000,

   (void *)0xce000,

   (void *)0xde000,

   (void *)0xcc000,             /* Extra addresses for PCI boards */

   (void *)0xd0000,

   (void *)0xe0000,

};

#define ADDRESS_COUNT (sizeof( addresses ) / sizeof( unsigned ))

static unsigned short ports[] = { 0x140, 0x150, 0x160, 0x170 };

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

static unsigned short ints[] = { 3, 5, 10, 11, 12, 14, 15, 0 };

/*

  READ THIS BEFORE YOU ADD A SIGNATURE!

  READING THIS SHORT NOTE CAN SAVE YOU LOTS OF TIME!

  READ EVERY WORD, ESPECIALLY THE WORD *NOT*

  This driver works *ONLY* for Future Domain cards using the TMC-1800,

  TMC-18C50, or TMC-18C30 chip.  This includes models TMC-1650, 1660, 1670,

  and 1680.

  The following BIOS signature signatures are for boards which do *NOT*

  work with this driver (these TMC-8xx and TMC-9xx boards may work with the

  Seagate driver):

  FUTURE DOMAIN CORP. (C) 1986-1988 V4.0I 03/16/88

  FUTURE DOMAIN CORP. (C) 1986-1989 V5.0C2/14/89

  FUTURE DOMAIN CORP. (C) 1986-1989 V6.0A7/28/89

  FUTURE DOMAIN CORP. (C) 1986-1990 V6.0105/31/90

  FUTURE DOMAIN CORP. (C) 1986-1990 V6.0209/18/90

  FUTURE DOMAIN CORP. (C) 1986-1990 V7.009/18/90

  FUTURE DOMAIN CORP. (C) 1992 V8.00.004/02/92

*/

struct signature {

   const char *signature;

   int  sig_offset;

   int  sig_length;

   int  major_bios_version;

   int  minor_bios_version;

   int  flag; /* 1 == PCI_bus, 2 == ISA_200S, 3 == ISA_250MG, 4 == ISA_200S */

} signatures[] = {

   /*          1         2         3         4         5         6 */

   /* 123456789012345678901234567890123456789012345678901234567890 */

   { "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V2.07/28/89",  5, 50,  2,  0, 0 },

   { "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V1.07/28/89",  5, 50,  2,  0, 0 },

   { "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V2.07/28/89", 72, 50,  2,  0, 2 },

   { "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V2.0",        73, 43,  2,  0, 3 },

   { "FUTURE DOMAIN CORP. (C) 1991 1800-V2.0.",            72, 39,  2,  0, 4 },

   { "FUTURE DOMAIN CORP. (C) 1992 V3.00.004/02/92",        5, 44,  3,  0, 0 },

   { "FUTURE DOMAIN TMC-18XX (C) 1993 V3.203/12/93",        5, 44,  3,  2, 0 },

   { "IBM F1 P2 BIOS v1.0104/29/93",                        5, 28,  3, -1, 0 },

   { "Future Domain Corp. V1.0008/18/93",                   5, 33,  3,  4, 0 },

   { "Future Domain Corp. V1.0008/18/93",                  26, 33,  3,  4, 1 },

   { "Adaptec AHA-2920 PCI-SCSI Card",                     42, 31,  3, -1, 1 },

   { "IBM F1 P264/32",                                      5, 14,  3, -1, 1 },

                                /* This next signature may not be a 3.5 bios */

   { "Future Domain Corp. V2.0108/18/93",                   5, 33,  3,  5, 0 },

   { "FUTURE DOMAIN CORP.  V3.5008/18/93",                  5, 34,  3,  5, 0 },

   { "FUTURE DOMAIN 18c30/18c50/1800 (C) 1994 V3.5",        5, 44,  3,  5, 0 },

   { "FUTURE DOMAIN CORP.  V3.6008/18/93",                  5, 34,  3,  6, 0 },

   { "FUTURE DOMAIN CORP.  V3.6108/18/93",                  5, 34,  3,  6, 0 },

   { "FUTURE DOMAIN TMC-18XX",                              5, 22, -1, -1, 0 },

   /* READ NOTICE ABOVE *BEFORE* YOU WASTE YOUR TIME ADDING A SIGNATURE

    Also, fix the disk geometry code for your signature and send your

    changes for faith@cs.unc.edu.  Above all, do *NOT* change any old

    signatures!

    Note that the last line will match a "generic" 18XX bios.  Because

    Future Domain has changed the host SCSI ID and/or the location of the

    geometry information in the on-board RAM area for each of the first

    three BIOS's, it is still important to enter a fully qualified

    signature in the table for any new BIOS's (after the host SCSI ID and

    geometry location are verified). */

};

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

static void print_banner( struct Scsi_Host *shpnt )

{

   if (!shpnt) return;          /* This won't ever happen */

   if (bios_major < 0 && bios_minor < 0) {

      printk( "scsi%d <fdomain>: No BIOS; using scsi id %d\n",

              shpnt->host_no, shpnt->this_id );

   } else {

      printk( "scsi%d <fdomain>: BIOS version ", shpnt->host_no );

      if (bios_major >= 0) printk( "%d.", bios_major );

      else                 printk( "?." );

      if (bios_minor >= 0) printk( "%d", bios_minor );

      else                 printk( "?." );

      printk( " at 0x%x using scsi id %d\n",

              (unsigned)bios_base, shpnt->this_id );

   }

                                /* If this driver works for later FD PCI

                                   boards, we will have to modify banner

                                   for additional PCI cards, but for now if

                                   it's PCI it's a TMC-3260 - JTM */

   printk( "scsi%d <fdomain>: %s chip at 0x%x irq ",

           shpnt->host_no,

           chip == tmc1800 ? "TMC-1800"

           : (chip == tmc18c50 ? "TMC-18C50"

              : (chip == tmc18c30 ?

                 (PCI_bus ? "TMC-36C70 (PCI bus)" : "TMC-18C30")

                 : "Unknown")),

           port_base );

   if (interrupt_level) printk( "%d", interrupt_level );

   else                 printk( "<none>" );

   printk( "\n" );

}

void fdomain_setup( char *str, int *ints )

{

   if (setup_called++ || ints[0] < 2 || ints[0] > 3) {

      printk( "fdomain: usage: fdomain=<PORT_BASE>,<IRQ>[,<ADAPTER_ID>]\n" );

      printk( "fdomain: bad LILO parameters?\n" );

   }

   port_base       = ints[0] >= 1 ? ints[1] : 0;

   interrupt_level = ints[0] >= 2 ? ints[2] : 0;

   this_id         = ints[0] >= 3 ? ints[3] : 0;

   bios_major = bios_minor = -1; /* Use geometry for BIOS version >= 3.4 */

}

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);

}

inline static void fdomain_make_bus_idle( void )

{

   outb( 0, SCSI_Cntl_port );

   outb( 0, SCSI_Mode_Cntl_port );

   if (chip == tmc18c50 || chip == tmc18c30)

         outb( 0x21 | PARITY_MASK, TMC_Cntl_port ); /* Clear forced intr. */

   else

         outb( 0x01 | PARITY_MASK, TMC_Cntl_port );

}

static int fdomain_is_valid_port( int port )

{

#if DEBUG_DETECT 

   printk( " (%x%x),",

           inb( port + MSB_ID_Code ), inb( port + LSB_ID_Code ) );

#endif

   /* The MCA ID is a unique id for each MCA compatible board.  We

      are using ISA boards, but Future Domain provides the MCA ID

      anyway.  We can use this ID to ensure that this is a Future

      Domain TMC-1660/TMC-1680.

    */

   if (inb( port + LSB_ID_Code ) != 0xe9) { /* test for 0x6127 id */

      if (inb( port + LSB_ID_Code ) != 0x27) return 0;

      if (inb( port + MSB_ID_Code ) != 0x61) return 0;

      chip = tmc1800;

   } else {                                 /* test for 0xe960 id */

      if (inb( port + MSB_ID_Code ) != 0x60) return 0;

      chip = tmc18c50;

#if 0

                                /* Try to toggle 32-bit mode.  This only

                                   works on an 18c30 chip.  (User reports

                                   say this works, so we should switch to

                                   it in the near future.) */

      outb( 0x80, port + IO_Control );

      if ((inb( port + Configuration2 ) & 0x80) == 0x80) {

         outb( 0x00, port + IO_Control );

         if ((inb( port + Configuration2 ) & 0x80) == 0x00) {

            chip = tmc18c30;

            FIFO_Size = 0x800;  /* 2k FIFO */

         }

      }

#else

                                /* That should have worked, but appears to

                                   have problems.  Let's assume it is an

                                   18c30 if the RAM is disabled. */

      if (inb( port + Configuration2 ) & 0x02) {

         chip      = tmc18c30;

         FIFO_Size = 0x800;     /* 2k FIFO */

      }

#endif

                                /* If that failed, we are an 18c50. */

   }

   return 1;

}

static int fdomain_test_loopback( void )

{

   int i;

   int result;

   for (i = 0; i < 255; i++) {

      outb( i, port_base + Write_Loopback );

      result = inb( port_base + Read_Loopback );

      if (i != result)

            return 1;

   }

   return 0;

}

/* fdomain_get_irq assumes that we have a valid MCA ID for a

   TMC-1660/TMC-1680 Future Domain board.  Now, check to be sure the

   bios_base matches these ports.  If someone was unlucky enough to have

   purchased more than one Future Domain board, then they will have to

   modify this code, as we only detect one board here.  [The one with the

   lowest bios_base.]

   Note that this routine is only used for systems without a PCI BIOS32

   (e.g., ISA bus).  For PCI bus systems, this routine will likely fail

   unless one of the IRQs listed in the ints array is used by the board.

   Sometimes it is possible to use the computer's BIOS setup screen to

   configure a PCI system so that one of these IRQs will be used by the

   Future Domain card. */

static int fdomain_get_irq( int base )

{

   int options = inb( base + Configuration1 );

#if DEBUG_DETECT

   printk( " Options = %x\n", options );

#endif

                                /* Check for board with lowest bios_base --

                                   this isn't valid for the 18c30 or for

                                   boards on the PCI bus, so just assume we

                                   have the right board. */

   if (chip != tmc18c30

       && !PCI_bus

       && addresses[ (options & 0xc0) >> 6 ] != bios_base) return 0;

   return ints[ (options & 0x0e) >> 1 ];

}

static int fdomain_isa_detect( int *irq, int *iobase )

{

   int i;

   int base;

   int flag = 0;

   if (bios_major == 2) {

      /* The TMC-1660/TMC-1680 has a RAM area just after the BIOS ROM.

         Assuming the ROM is enabled (otherwise we wouldn't have been

         able to read the ROM signature :-), then the ROM sets up the

         RAM area with some magic numbers, such as a list of port

         base addresses and a list of the disk "geometry" reported to

         DOS (this geometry has nothing to do with physical geometry).

       */

      switch (Quantum) {

      case 2:                   /* ISA_200S */

      case 3:                   /* ISA_250MG */

         base = *((char *)bios_base + 0x1fa2)

               + (*((char *)bios_base + 0x1fa3) << 8);

         break;

      case 4:                   /* ISA_200S (another one) */

         base = *((char *)bios_base + 0x1fa3)

               + (*((char *)bios_base + 0x1fa4) << 8);

         break;

      default:

         base = *((char *)bios_base + 0x1fcc)

               + (*((char *)bios_base + 0x1fcd) << 8);

         break;

      }

#if DEBUG_DETECT

      printk( " %x,", base );

#endif

      for (flag = 0, i = 0; !flag && i < PORT_COUNT; i++) {

         if (base == ports[i])

               ++flag;

      }

      if (flag && fdomain_is_valid_port( base )) {

         *irq    = fdomain_get_irq( base );

         *iobase = base;

         return 1;

      }

      /* This is a bad sign.  It usually means that someone patched the

         BIOS signature list (the signatures variable) to contain a BIOS

         signature for a board *OTHER THAN* the TMC-1660/TMC-1680. */

#if DEBUG_DETECT

      printk( " RAM FAILED, " );

#endif

   }

   /* Anyway, the alternative to finding the address in the RAM is to just

      search through every possible port address for one that is attached

      to the Future Domain card.  Don't panic, though, about reading all

      these random port addresses -- there are rumors that the Future

      Domain BIOS does something very similar.

      Do not, however, check ports which the kernel knows are being used by

      another driver. */

   for (i = 0; i < PORT_COUNT; i++) {

      base = ports[i];

      if (check_region( base, 0x10 )) {

#if DEBUG_DETECT

         printk( " (%x inuse),", base );

#endif

         continue;

      }

#if DEBUG_DETECT

      printk( " %x,", base );