fdomain.c

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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              do_fdomain_16x0_intr( int irq, void *dev_id,
					    struct pt_regs * regs );

#ifdef MODULE
				/* Allow insmod parameters to be like LILO
                                   parameters.  For example:
				   insmod fdomain fdomain=0x140,11
				*/
static char * fdomain = NULL;
MODULE_PARM(fdomain, "s");
#endif

static unsigned long addresses[] = {
   0xc8000,
   0xca000,
   0xce000,
   0xde000,
   0xcc000,		/* Extra addresses for PCI boards */
   0xd0000,
   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.  These are all 16-bit cards.

  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

  (The cards which do *NOT* work are all 8-bit cards -- although some of
  them have a 16-bit form-factor, the upper 8-bits are used only for IRQs
  and are *NOT* used for data.  You can tell the difference by following
  the tracings on the circuit board -- if only the IRQ lines are involved,
  you have a "8-bit" card, and should *NOT* use this driver.)

*/

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 [e-mail].  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%lx using scsi id %d\n",
	      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" );
}

static int __init fdomain_setup( char *str )
{
	int ints[4];

	(void)get_options(str, ARRAY_SIZE(ints), ints);

	if (setup_called++ || ints[0] < 2 || ints[0] > 3) {
		printk( "scsi: <fdomain>"
		" Usage: fdomain=<PORT_BASE>,<IRQ>[,<ADAPTER_ID>]\n" );
		printk( "scsi: <fdomain> Bad LILO/INSMOD parameters?\n" );
		return 0;
	}

	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 */
	++setup_called;
	return 1;
}

__setup("fdomain=", fdomain_setup);


static void do_pause( unsigned amount )	/* Pause for amount*10 milliseconds */
{
   mdelay(10*amount);
}

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;

				/* 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 */
	 }
      }
				/* 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( "scsi: <fdomain> 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, j;
   int base = 0xdeadbeef;
   int flag = 0;

#if DEBUG_DETECT
   printk( "scsi: <fdomain> fdomain_isa_detect:" );
#endif


   for (i = 0; !bios_base && i < ADDRESS_COUNT; i++) {
#if DEBUG_DETECT
      printk( " %lx(%lx),", addresses[i], bios_base );
#endif
      for (j = 0; !bios_base && j < SIGNATURE_COUNT; j++) {
	 if (isa_check_signature(addresses[i] + signatures[j].sig_offset,
			     signatures[j].signature,
			     signatures[j].sig_length )) {
	    bios_major = signatures[j].major_bios_version;
	    bios_minor = signatures[j].minor_bios_version;
	    PCI_bus    = (signatures[j].flag == 1);
	    Quantum    = (signatures[j].flag > 1) ? signatures[j].flag : 0;
	    bios_base  = addresses[i];
	 }
      }
   }
   
   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 = isa_readb(bios_base + 0x1fa2) + (isa_readb(bios_base + 0x1fa3) << 8);
	 break;
      case 4:			/* ISA_200S (another one) */
	 base = isa_readb(bios_base + 0x1fa3) + (isa_readb(bios_base + 0x1fa4) << 8);
	 break;
      default:
	 base = isa_readb(bios_base + 0x1fcc) + (isa_readb(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 );
#endif
      if ((flag = fdomain_is_valid_port( base ))) break;
   }

#if DEBUG_DETECT
   if (flag) printk( " SUCCESS\n" );
   else      printk( " FAILURE\n" );
#endif

   if (!flag) return 0;		/* iobase not found */

   *irq    = fdomain_get_irq( base );
   *iobase = base;

   return 1;			/* success */
}

/* PCI detection function: int fdomain_pci_bios_detect(int* irq, int*