fd_mcs.c

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/* fd_mcs.c -- Future Domain MCS 600/700 (or IBM OEM) driver
 *
 * FutureDomain MCS-600/700 v0.2 03/11/1998 by ZP Gu ([e-mail])
 *
 * This driver is cloned from fdomain.* to specifically support
 * the Future Domain MCS 600/700 MCA SCSI adapters. Some PS/2s
 * also equipped with IBM Fast SCSI Adapter/A which is an OEM
 * of MCS 700.
 *
 * This driver also supports Reply SB16/SCSI card (the SCSI part).
 *
 * What makes this driver different is that this driver is MCA only
 * and it supports multiple adapters in the same system, IRQ 
 * sharing, some driver statistics, and maps highest SCSI id to sda.
 * All cards are auto-detected.
 *
 * Assumptions: TMC-1800/18C50/18C30, BIOS >= 3.4
 *
 * LILO command-line options:
 *   fd_mcs=<FIFO_COUNT>[,<FIFO_SIZE>]
 *
 * ********************************************************
 * Please see Copyrights/Comments in fdomain.* for credits.
 * Following is from fdomain.c for acknowledgement:
 *
 * Created: Sun May  3 18:53:19 1992 by [e-mail]
 * Revised: Wed Oct  2 11:10:55 1996 by [e-mail]
 * Author: Rickard E. Faith, [e-mail]
 * Copyright 1992, 1993, 1994, 1995, 1996 Rickard E. Faith
 *
 * $Id: fdomain.c,v 5.45 1996/10/02 15:13:06 root 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.

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

 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.
 [*****Now a runtime option*****]

 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.

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

#include <linux/module.h>

#include <linux/sched.h>
#include <linux/blk.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/mca.h>
#include <linux/spinlock.h>
#include <asm/io.h>
#include <asm/system.h>

#include "scsi.h"
#include "hosts.h"
#include "fd_mcs.h"

#define DRIVER_VERSION "v0.2 by ZP Gu<[e-mail]>"
  
/* START OF USER DEFINABLE OPTIONS */

#define DEBUG            0	/* Enable debugging output */
#define ENABLE_PARITY    1	/* Enable SCSI Parity */
#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     1	/* Debug fd_mcs_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
};

struct fd_hostdata {
  unsigned long     _bios_base;
  int               _bios_major;
  int               _bios_minor;
  volatile int      _in_command;
  Scsi_Cmnd         *_current_SC;
  enum chip_type    _chip;
  int               _adapter_mask;
  int               _fifo_count; /* Number of 512 byte blocks before INTR */

  char              _adapter_name[64];
#if DEBUG_RACE
  volatile int      _in_interrupt_flag;
#endif

  int               _SCSI_Mode_Cntl_port;
  int               _FIFO_Data_Count_port;
  int               _Interrupt_Cntl_port;
  int               _Interrupt_Status_port;
  int               _Interrupt_Cond_port;
  int               _Read_FIFO_port;
  int               _Read_SCSI_Data_port;
  int               _SCSI_Cntl_port;
  int               _SCSI_Data_NoACK_port;
  int               _SCSI_Status_port;
  int               _TMC_Cntl_port;
  int               _TMC_Status_port;
  int               _Write_FIFO_port;
  int               _Write_SCSI_Data_port;

  int               _FIFO_Size; /* = 0x2000;  8k FIFO for
				   pre-tmc18c30 chips */
  /* simple stats */
  int               _Bytes_Read;
  int               _Bytes_Written;
  int               _INTR_Processed;
};

#define FD_MAX_HOSTS 3		/* enough? */

#define HOSTDATA(shpnt) ((struct fd_hostdata *) shpnt->hostdata)
#define bios_base             (HOSTDATA(shpnt)->_bios_base)
#define bios_major            (HOSTDATA(shpnt)->_bios_major)
#define bios_minor            (HOSTDATA(shpnt)->_bios_minor)
#define in_command            (HOSTDATA(shpnt)->_in_command)
#define current_SC            (HOSTDATA(shpnt)->_current_SC)
#define chip                  (HOSTDATA(shpnt)->_chip)
#define adapter_mask          (HOSTDATA(shpnt)->_adapter_mask)
#define FIFO_COUNT            (HOSTDATA(shpnt)->_fifo_count)
#define adapter_name          (HOSTDATA(shpnt)->_adapter_name)
#if DEBUG_RACE
#define in_interrupt_flag     (HOSTDATA(shpnt)->_in_interrupt_flag)
#endif	                     
#define SCSI_Mode_Cntl_port   (HOSTDATA(shpnt)->_SCSI_Mode_Cntl_port)
#define FIFO_Data_Count_port  (HOSTDATA(shpnt)->_FIFO_Data_Count_port)
#define Interrupt_Cntl_port   (HOSTDATA(shpnt)->_Interrupt_Cntl_port)
#define Interrupt_Status_port (HOSTDATA(shpnt)->_Interrupt_Status_port)
#define Interrupt_Cond_port   (HOSTDATA(shpnt)->_Interrupt_Cond_port)
#define Read_FIFO_port        (HOSTDATA(shpnt)->_Read_FIFO_port)
#define Read_SCSI_Data_port   (HOSTDATA(shpnt)->_Read_SCSI_Data_port)
#define SCSI_Cntl_port        (HOSTDATA(shpnt)->_SCSI_Cntl_port)
#define SCSI_Data_NoACK_port  (HOSTDATA(shpnt)->_SCSI_Data_NoACK_port)
#define SCSI_Status_port      (HOSTDATA(shpnt)->_SCSI_Status_port)
#define TMC_Cntl_port         (HOSTDATA(shpnt)->_TMC_Cntl_port)
#define TMC_Status_port       (HOSTDATA(shpnt)->_TMC_Status_port)
#define Write_FIFO_port       (HOSTDATA(shpnt)->_Write_FIFO_port)
#define Write_SCSI_Data_port  (HOSTDATA(shpnt)->_Write_SCSI_Data_port)
#define FIFO_Size             (HOSTDATA(shpnt)->_FIFO_Size)
#define Bytes_Read            (HOSTDATA(shpnt)->_Bytes_Read)
#define Bytes_Written         (HOSTDATA(shpnt)->_Bytes_Written)
#define INTR_Processed        (HOSTDATA(shpnt)->_INTR_Processed)

struct fd_mcs_adapters_struct {
  char* name;
  int id;
  enum chip_type fd_chip;
  int fifo_size;
  int fifo_count;
};

#define REPLY_ID 0x5137

static struct fd_mcs_adapters_struct fd_mcs_adapters[] = {
  { "Future Domain SCSI Adapter MCS-700(18C50)",
    0x60e9,
    tmc18c50,
    0x2000,
    4 },
  { "Future Domain SCSI Adapter MCS-600/700(TMC-1800)",
    0x6127,
    tmc1800,
    0x2000,
    4 },
  { "Reply Sound Blaster/SCSI Adapter",
    REPLY_ID,
    tmc18c30,
    0x800,
    2 },
};

#define FD_BRDS sizeof(fd_mcs_adapters)/sizeof(struct fd_mcs_adapters_struct)

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

static unsigned long addresses[] = {0xc8000, 0xca000, 0xce000, 0xde000};
static unsigned short ports[] = { 0x140, 0x150, 0x160, 0x170 };
static unsigned short ints[] = { 3, 5, 10, 11, 12, 14, 15, 0 };

/* host information */
static int found = 0;
static struct Scsi_Host *hosts[FD_MAX_HOSTS+1] = { NULL };

static int user_fifo_count = 0;
static int user_fifo_size = 0;

void fd_mcs_setup( char *str, int *ints )
{
  static int done_setup = 0;

  if (done_setup++ || ints[0] < 1 || ints[0] > 2 ||
      ints[1] < 1 || ints[1] > 16) {
    printk( "fd_mcs: usage: fd_mcs=FIFO_COUNT, FIFO_SIZE\n" );
  }

  user_fifo_count = ints[0] >= 1 ? ints[1] : 0;
  user_fifo_size  = ints[0] >= 2 ? ints[2] : 0;
}

static void print_banner( struct Scsi_Host *shpnt )
{
  printk( "scsi%d <fd_mcs>: ", shpnt->host_no);

  if (bios_base) {
    printk( "BIOS at 0x%lX", bios_base);
  } else {
    printk( "No BIOS");
  }

  printk( ", HostID %d, %s Chip, IRQ %d, IO 0x%lX\n",
          shpnt->this_id,
          chip == tmc18c50 ? "TMC-18C50"
             : (chip == tmc18c30 ? "TMC-18C30" :
                (chip == tmc1800 ? "TMC-1800" : "Unknown")),
          shpnt->irq,
          shpnt->io_port );
}


static void do_pause( unsigned amount )	/* Pause for amount*10 milliseconds */
{
  do {
    udelay(10*1000);
  } while (--amount);
}

inline static void fd_mcs_make_bus_idle( struct Scsi_Host *shpnt )
{
  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 );
}

int fd_mcs_detect( Scsi_Host_Template *tpnt )
{
  int loop;
  struct Scsi_Host *shpnt;

  /* get id, port, bios, irq */
  int slot;
  u_char pos2, pos3, pos4;
  int id, port, irq;
  unsigned long bios;

  /* if not MCA machine, return */
  if (!MCA_bus)
    return 0;

  /* changeable? */
  id = 7;

  for( loop = 0; loop < FD_BRDS; loop++ ) {
    slot = 0;
    while ( MCA_NOTFOUND !=
	    (slot = mca_find_adapter(fd_mcs_adapters[loop].id,
				     slot)) ) {

      /* if we get this far, an adapter has been detected and is
	 enabled */

      printk("scsi  <fd_mcs>: %s at slot %d\n",
	     fd_mcs_adapters[loop].name, slot + 1 );

      pos2 = mca_read_stored_pos( slot, 2 );
      pos3 = mca_read_stored_pos( slot, 3 );
      pos4 = mca_read_stored_pos( slot, 4);

      /* ready for next probe */
      slot++;

      if (fd_mcs_adapters[loop].id == REPLY_ID) { /* reply card */
	static int reply_irq[] = {10, 11, 14, 15};

	bios = 0;		/* no bios */

	if (pos2 & 0x2)
	  port = ports[pos4 & 0x3];
	else
	  continue;

	/* can't really disable it, same as irq=10 */
	irq = reply_irq[((pos4 >> 2) & 0x1) + 2*((pos4 >> 4) & 0x1)];
      } else {
	bios = addresses[pos2 >> 6];
	port = ports[(pos2 >> 4) & 0x03];
	irq = ints[(pos2 >> 1) & 0x07];
      }

      if (irq) {
	/* claim the slot */
	mca_set_adapter_name( slot-1, fd_mcs_adapters[loop].name );

	/* check irq/region */
	if (check_region(port, 0x10) ||
	    request_irq(irq, fd_mcs_intr,
			SA_SHIRQ, "fd_mcs", hosts)) {
	  printk( "fd_mcs: check_region() || request_irq() failed, Skip it\n");

	  continue;
	}

	/* register */
	if (!(shpnt = scsi_register(tpnt, sizeof(struct fd_hostdata)))) {
	  printk( "fd_mcs: scsi_register() failed\n");
	  continue;
	}

	/* request I/O region */
	request_region( port, 0x10, "fd_mcs" );

	/* save name */
	strcpy(adapter_name, fd_mcs_adapters[loop].name);

	/* chip/fifo */
	chip = fd_mcs_adapters[loop].fd_chip;
	/* use boot time value if available */
	FIFO_COUNT =
	  user_fifo_count?user_fifo_count:fd_mcs_adapters[loop].fifo_count;
	FIFO_Size =
	  user_fifo_size?user_fifo_size:fd_mcs_adapters[loop].fifo_size;

#ifdef NOT_USED
	/* *************************************************** */
	/* 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 */

	    printk("FIRST: chip=%s, fifo_size=0x%x\n",
		   (chip == tmc18c30)?"tmc18c30":"tmc18c50", FIFO_Size);
	  }
	}

	/* 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 */

	  printk("SECOND: chip=%s, fifo_size=0x%x\n",
		 (chip == tmc18c30)?"tmc18c30":"tmc18c50", FIFO_Size);
	}
	/* *************************************************** */	    
#endif

	/* IBM/ANSI scsi scan ordering */
	/* Stick this back in when the scsi.c changes are there */
	shpnt->reverse_ordering = 1;
	

	/* saving info */
	hosts[found++] = shpnt;

	shpnt->this_id = id;
	shpnt->irq = irq;
	shpnt->io_port = port;
	shpnt->n_io_port = 0x10;

	/* save */
	bios_base    = bios;
	adapter_mask = (1 << id);

	/* save more */
	SCSI_Mode_Cntl_port   = port + SCSI_Mode_Cntl;
	FIFO_Data_Count_port  = port + FIFO_Data_Count;
	Interrupt_Cntl_port   = port + Interrupt_Cntl;
	Interrupt_Status_port = port + Interrupt_Status;
	Interrupt_Cond_port   = port + Interrupt_Cond;