#define AUTOSENSE
  #define PSEUDO_DMA
  
  /*
   * Trantor T128/T128F/T228 driver
   *	Note : architecturally, the T100 and T130 are different and won't 
   * 	work
   *
   * Copyright 1993, Drew Eckhardt
   *	Visionary Computing
   *	(Unix and Linux consulting and custom programming)
   *	drew@colorado.edu
   *      +1 (303) 440-4894
   *
   * DISTRIBUTION RELEASE 3.
   *
   * For more information, please consult 
   *
   * Trantor Systems, Ltd.
   * T128/T128F/T228 SCSI Host Adapter
   * Hardware Specifications
   * 
   * Trantor Systems, Ltd. 
   * 5415 Randall Place
   * Fremont, CA 94538
   * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
   * 
   * and 
   *
   * NCR 5380 Family
   * SCSI Protocol Controller
   * Databook
   *
   * NCR Microelectronics
   * 1635 Aeroplaza Drive
   * Colorado Springs, CO 80916
   * 1+ (719) 578-3400
   * 1+ (800) 334-5454
   */
  
  /*
   * Options : 
   * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
   *      for commands that return with a CHECK CONDITION status. 
   *
   * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
   * increase compared to polled I/O.
   *
   * PARITY - enable parity checking.  Not supported.
   * 
   * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
   *
   *
   * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.  You
   *          only really want to use this if you're having a problem with
   *          dropped characters during high speed communications, and even
   *          then, you're going to be better off twiddling with transfersize.
   *
   * USLEEP - enable support for devices that don't disconnect.  Untested.
   *
   * The card is detected and initialized in one of several ways : 
   * 1.  Autoprobe (default) - since the board is memory mapped, 
   *     a BIOS signature is scanned for to locate the registers.
   *     An interrupt is triggered to autoprobe for the interrupt
   *     line.
   *
   * 2.  With command line overrides - t128=address,irq may be 
   *     used on the LILO command line to override the defaults.
   *
   * 3.  With the T128_OVERRIDE compile time define.  This is 
   *     specified as an array of address, irq tuples.  Ie, for
   *     one board at the default 0xcc000 address, IRQ5, I could say 
   *     -DT128_OVERRIDE={{0xcc000, 5}}
   *	
   *     Note that if the override methods are used, place holders must
   *     be specified for other boards in the system.
   * 
   * T128/T128F jumper/dipswitch settings (note : on my sample, the switches 
   * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
   *
   * T128    Sw7 Sw8 Sw6 = 0ws Sw5 = boot 
   * T128F   Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
   * cc000   off off      
   * c8000   off on
   * dc000   on  off
   * d8000   on  on
   *
   * 
   * Interrupts 
   * There is a 12 pin jumper block, jp1, numbered as follows : 
   *   T128 (JP1)  	 T128F (J5)
   * 2 4 6 8 10 12	11 9  7 5 3 1
   * 1 3 5 7 9  11	12 10 8 6 4 2
   *
   * 3   2-4
   * 5   1-3
   * 7   3-5
   * T128F only 
   * 10 8-10
   * 12 7-9
   * 14 10-12
   * 15 9-11
   */
   
  /*
   * $Log: t128.c,v $
   */
  
  #include <asm/system.h>
  #include <linux/signal.h>

  #include <linux/io.h>

  #include <linux/blkdev.h>
  #include <linux/interrupt.h>
  #include <linux/stat.h>
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/delay.h>
  
  #include "scsi.h"
  #include <scsi/scsi_host.h>
  #include "t128.h"
  #define AUTOPROBE_IRQ
  #include "NCR5380.h"
  
  static struct override {
      unsigned long address;
      int irq;

  } overrides

  #ifdef T128_OVERRIDE
      [] __initdata = T128_OVERRIDE;
  #else

      [4] __initdata = {{0, IRQ_AUTO}, {0, IRQ_AUTO},

          {0 ,IRQ_AUTO}, {0, IRQ_AUTO}};
  #endif

  #define NO_OVERRIDES ARRAY_SIZE(overrides)

  
  static struct base {
      unsigned int address;
      int noauto;
  } bases[] __initdata = {
      { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
  };

  #define NO_BASES ARRAY_SIZE(bases)

  
  static struct signature {
      const char *string;
      int offset;
  } signatures[] __initdata = {
  {"TSROM: SCSI BIOS, Version 1.12", 0x36},
  };

  #define NO_SIGNATURES ARRAY_SIZE(signatures)

  
  /*
   * Function : t128_setup(char *str, int *ints)
   *
   * Purpose : LILO command line initialization of the overrides array,
   * 
   * Inputs : str - unused, ints - array of integer parameters with ints[0]
   *	equal to the number of ints.
   *
   */
  
  void __init t128_setup(char *str, int *ints){
      static int commandline_current = 0;
      int i;
      if (ints[0] != 2) 
  	printk("t128_setup : usage t128=address,irq
  ");
      else 
  	if (commandline_current < NO_OVERRIDES) {
  	    overrides[commandline_current].address = ints[1];
  	    overrides[commandline_current].irq = ints[2];
  	    for (i = 0; i < NO_BASES; ++i)
  		if (bases[i].address == ints[1]) {
  		    bases[i].noauto = 1;
  		    break;
  		}
  	    ++commandline_current;
  	}
  }
  
  /* 

   * Function : int t128_detect(struct scsi_host_template * tpnt)

   *
   * Purpose : detects and initializes T128,T128F, or T228 controllers
   *	that were autoprobed, overridden on the LILO command line, 
   *	or specified at compile time.
   *
   * Inputs : tpnt - template for this SCSI adapter.
   * 
   * Returns : 1 if a host adapter was found, 0 if not.
   *
   */

  int __init t128_detect(struct scsi_host_template * tpnt){

      static int current_override = 0, current_base = 0;
      struct Scsi_Host *instance;
      unsigned long base;
      void __iomem *p;
      int sig, count;
  
      tpnt->proc_name = "t128";
      tpnt->proc_info = &t128_proc_info;
  
      for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
  	base = 0;
  	p = NULL;
  
  	if (overrides[current_override].address) {
  	    base = overrides[current_override].address;
  	    p = ioremap(bases[current_base].address, 0x2000);
  	    if (!p)
  		base = 0;
  	} else 
  	    for (; !base && (current_base < NO_BASES); ++current_base) {
  #if (TDEBUG & TDEBUG_INIT)
      printk("scsi-t128 : probing address %08x
  ", bases[current_base].address);
  #endif
  		if (bases[current_base].noauto)
  			continue;
  		p = ioremap(bases[current_base].address, 0x2000);
  		if (!p)
  			continue;
  		for (sig = 0; sig < NO_SIGNATURES; ++sig) 
  		    if (check_signature(p + signatures[sig].offset,
  					signatures[sig].string,
  					strlen(signatures[sig].string))) {
  			base = bases[current_base].address;
  #if (TDEBUG & TDEBUG_INIT)
  			printk("scsi-t128 : detected board.
  ");
  #endif
  			goto found;
  		    }
  		iounmap(p);
  	    }
  
  #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
  	printk("scsi-t128 : base = %08x
  ", (unsigned int) base);
  #endif
  
  	if (!base)
  	    break;
  
  found:
  	instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
  	if(instance == NULL)
  		break;
  		
  	instance->base = base;
  	((struct NCR5380_hostdata *)instance->hostdata)->base = p;
  
  	NCR5380_init(instance, 0);
  
  	if (overrides[current_override].irq != IRQ_AUTO)
  	    instance->irq = overrides[current_override].irq;
  	else 
  	    instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
  
  	if (instance->irq != SCSI_IRQ_NONE) 

  	    if (request_irq(instance->irq, t128_intr, IRQF_DISABLED, "t128",
  			    instance)) {

  		printk("scsi%d : IRQ%d not free, interrupts disabled
  ", 
  		    instance->host_no, instance->irq);
  		instance->irq = SCSI_IRQ_NONE;
  	    } 
  
  	if (instance->irq == SCSI_IRQ_NONE) {
  	    printk("scsi%d : interrupts not enabled. for better interactive performance,
  ", instance->host_no);
  	    printk("scsi%d : please jumper the board for a free IRQ.
  ", instance->host_no);
  	}
  
  #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
  	printk("scsi%d : irq = %d
  ", instance->host_no, instance->irq);
  #endif
  
  	printk("scsi%d : at 0x%08lx", instance->host_no, instance->base);
  	if (instance->irq == SCSI_IRQ_NONE)
  	    printk (" interrupts disabled");
  	else 
  	    printk (" irq %d", instance->irq);
  	printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
  	    CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
  	NCR5380_print_options(instance);
  	printk("
  ");
  
  	++current_override;
  	++count;
      }
      return count;
  }
  
  static int t128_release(struct Scsi_Host *shost)
  {
  	NCR5380_local_declare();
  	NCR5380_setup(shost);
  	if (shost->irq)

  		free_irq(shost->irq, shost);

  	NCR5380_exit(shost);
  	if (shost->io_port && shost->n_io_port)
  		release_region(shost->io_port, shost->n_io_port);
  	scsi_unregister(shost);
  	iounmap(base);
  	return 0;
  }
  
  /*
   * Function : int t128_biosparam(Disk * disk, struct block_device *dev, int *ip)
   *
   * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for 
   *	the specified device / size.
   * 
   * Inputs : size = size of device in sectors (512 bytes), dev = block device
   *	major / minor, ip[] = {heads, sectors, cylinders}  
   *
   * Returns : always 0 (success), initializes ip
   *	
   */
  
  /* 
   * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
   * using hard disks on a trantor should verify that this mapping corresponds
   * to that used by the BIOS / ASPI driver by running the linux fdisk program
   * and matching the H_C_S coordinates to what DOS uses.
   */
  
  int t128_biosparam(struct scsi_device *sdev, struct block_device *bdev,
  		sector_t capacity, int * ip)
  {
    ip[0] = 64;
    ip[1] = 32;
    ip[2] = capacity >> 11;
    return 0;
  }
  
  /*
   * Function : int NCR5380_pread (struct Scsi_Host *instance, 
   *	unsigned char *dst, int len)
   *
   * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to 
   *	dst
   * 
   * Inputs : dst = destination, len = length in bytes
   *
   * Returns : 0 on success, non zero on a failure such as a watchdog 
   * 	timeout.
   */
  
  static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
      int len) {
      NCR5380_local_declare();
      void __iomem *reg;
      unsigned char *d = dst;
      register int i = len;
  
      NCR5380_setup(instance);
      reg = base + T_DATA_REG_OFFSET;
  
  #if 0
      for (; i; --i) {
  	while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
  #else
      while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
      for (; i; --i) {
  #endif
  	*d++ = readb(reg);
      }
  
      if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
  	unsigned char tmp;
  	void __iomem *foo = base + T_CONTROL_REG_OFFSET;
  	tmp = readb(foo);
  	writeb(tmp | T_CR_CT, foo);
  	writeb(tmp, foo);
  	printk("scsi%d : watchdog timer fired in NCR5380_pread()
  ",
  	    instance->host_no);
  	return -1;
      } else
  	return 0;
  }
  
  /*
   * Function : int NCR5380_pwrite (struct Scsi_Host *instance, 
   *	unsigned char *src, int len)
   *
   * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
   *	src
   * 
   * Inputs : src = source, len = length in bytes
   *
   * Returns : 0 on success, non zero on a failure such as a watchdog 
   * 	timeout.
   */
  
  static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
      int len) {
      NCR5380_local_declare();
      void __iomem *reg;
      unsigned char *s = src;
      register int i = len;
  
      NCR5380_setup(instance);
      reg = base + T_DATA_REG_OFFSET;
  
  #if 0
      for (; i; --i) {
  	while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
  #else
      while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
      for (; i; --i) {
  #endif
  	writeb(*s++, reg);
      }
  
      if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
  	unsigned char tmp;
  	void __iomem *foo = base + T_CONTROL_REG_OFFSET;
  	tmp = readb(foo);
  	writeb(tmp | T_CR_CT, foo);
  	writeb(tmp, foo);
  	printk("scsi%d : watchdog timer fired in NCR5380_pwrite()
  ",
  	    instance->host_no);
  	return -1;
      } else 
  	return 0;
  }
  
  MODULE_LICENSE("GPL");
  
  #include "NCR5380.c"

  static struct scsi_host_template driver_template = {

  	.name           = "Trantor T128/T128F/T228",
  	.detect         = t128_detect,
  	.release        = t128_release,
  	.queuecommand   = t128_queue_command,
  	.eh_abort_handler = t128_abort,
  	.eh_bus_reset_handler    = t128_bus_reset,

  	.bios_param     = t128_biosparam,
  	.can_queue      = CAN_QUEUE,
          .this_id        = 7,
  	.sg_tablesize   = SG_ALL,
  	.cmd_per_lun    = CMD_PER_LUN,
  	.use_clustering = DISABLE_CLUSTERING,
  };
  #include "scsi_module.c"