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#define AUTOSENSE

#define PSEUDO_DMA

#define DONT_USE_INTR

#define UNSAFE          /* Leave interrupts enabled during pseudo-dma I/O */

#define xNDEBUG (NDEBUG_INTR+NDEBUG_RESELECTION+\

                 NDEBUG_SELECTION+NDEBUG_ARBITRATION)

#define DMA_WORKS_RIGHT

/*

 * DTC 3180/3280 driver, by

 *      Ray Van Tassle  rayvt@comm.mot.com

 *

 *      taken from ...

 *      Trantor T128/T128F/T228 driver by...

 *

 *      Drew Eckhardt

 *      Visionary Computing

 *      (Unix and Linux consulting and custom programming)

 *      drew@colorado.edu

 *      +1 (303) 440-4894

 *

 * DISTRIBUTION RELEASE 1.

 *

 * For more information, please consult

 *

 * NCR 5380 Family

 * SCSI Protocol Controller

 * Databook

*/

/*

 * 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.

 *

 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.

 *              You probably want this.

 *

 * 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 - dtc=address,irq may be

 *     used on the LILO command line to override the defaults.

 *

*/

/*----------------------------------------------------------------*/

/* the following will set the monitor border color (useful to find

 where something crashed or gets stuck at */

/* 1 = blue

 2 = green

 3 = cyan

 4 = red

 5 = magenta

 6 = yellow

 7 = white

*/

#if 0

#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}

#else

#define rtrc(i) {}

#endif

#include <asm/system.h>

#include <linux/signal.h>

#include <linux/sched.h>

#include <linux/blk.h>

#include <asm/io.h>

#include "scsi.h"

#include "hosts.h"

#include "dtc.h"

#define AUTOPROBE_IRQ

#include "NCR5380.h"

#include "constants.h"

#include "sd.h"

#include<linux/stat.h>

#include<linux/string.h>

struct proc_dir_entry proc_scsi_dtc = {

   PROC_SCSI_T128, 7, "dtc3x80",

        S_IFDIR | S_IRUGO | S_IXUGO, 2

     };

static struct override {

   __u32 address;

   int irq;

} overrides

#ifdef OVERRIDE

[] = OVERRIDE;

#else

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

       {0, IRQ_AUTO}};

#endif

#define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))

static struct base {

   __u32 address;

   int noauto;

} bases[] = {{0xcc000, 0}, {0xc8000, 0},

{0xdc000, 0}, {0xd8000, 0}};

#define NO_BASES (sizeof (bases) / sizeof (struct base))

static const struct signature {

   const char *string;

   int offset;

} signatures[] = { {"DATA TECHNOLOGY CORPORATION BIOS", 0x25}, };

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

/*

 * Function : dtc_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 dtc_setup(char *str, int *ints) {

   static int commandline_current = 0;

   int i;

   if (ints[0] != 2)

      printk("dtc_setup: usage dtc=address,irq\n");

   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 dtc_detect(Scsi_Host_Template * tpnt)

 *

 * Purpose : detects and initializes DTC 3180/3280 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 dtc_detect(Scsi_Host_Template * tpnt) {

   static int current_override = 0, current_base = 0;

   struct Scsi_Host *instance;

   unsigned char *base;

   int sig, count;

   tpnt->proc_dir = &proc_scsi_dtc;

   tpnt->proc_info = &dtc_proc_info;

   for (count = 0; current_override < NO_OVERRIDES; ++current_override) {

      base = NULL;

      if (overrides[current_override].address)

         base = (unsigned char *)overrides[current_override].address;

      else

         for (; !base && (current_base < NO_BASES); ++current_base) {

#if (DTCDEBUG & DTCDEBUG_INIT)

         printk("scsi : probing address %08x\n", (unsigned int) bases[current_base].address);

#endif

         for (sig = 0; sig < NO_SIGNATURES; ++sig)

            if (!bases[current_base].noauto && !memcmp

              ((unsigned char *)(bases[current_base].address + signatures[sig].offset),

              signatures[sig].string, strlen(signatures[sig].string))) {

            base = (unsigned char *)bases[current_base].address;

#if (DTCDEBUG & DTCDEBUG_INIT)

            printk("scsi-dtc : detected board.\n");

#endif

            break;

         }

      }

#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)

      printk("scsi-dtc : base = %08x\n", (unsigned int) base);

#endif

      if (!base)

         break;

      instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));

      instance->base = base;

      NCR5380_init(instance, 0);

      NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */

      if (overrides[current_override].irq != IRQ_AUTO)

         instance->irq = overrides[current_override].irq;

      else

         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);

#ifndef DONT_USE_INTR

/* With interrupts enabled, it will sometimes hang when doing heavy

 * reads. So better not enable them until I finger it out. */

      if (instance->irq != IRQ_NONE)

         if (request_irq(instance->irq, dtc_intr, SA_INTERRUPT, "dtc")) {

         printk("scsi%d : IRQ%d not free, interrupts disabled\n",

              instance->host_no, instance->irq);

         instance->irq = IRQ_NONE;

      }

      if (instance->irq == IRQ_NONE) {

         printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);

         printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);

      }

#else

      if (instance->irq != IRQ_NONE)

         printk("scsi%d : interrupts not used. Might as well not jumper it.\n",

                instance->host_no);

      instance->irq = IRQ_NONE;

#endif

#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)

      printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);

#endif

      printk("scsi%d : at 0x%05X", instance->host_no, (int)instance->base);

      if (instance->irq == 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, DTC_PUBLIC_RELEASE);

      NCR5380_print_options(instance);

      printk("\n");

      ++current_override;

      ++count;

   }

   return count;

}

/*

 * Function : int dtc_biosparam(Disk * disk, kdev_t 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 dtc_biosparam(Disk * disk, kdev_t dev, int * ip)

{

   int size = disk->capacity;

   ip[0] = 64;

   ip[1] = 32;

   ip[2] = size >> 11;

   return 0;

}

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

 * Function : int NCR5380_pread (struct Scsi_Host *instance,

 *      unsigned char *dst, int len)

 *

 * Purpose : Fast 5380 pseudo-dma read function, reads 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 int dtc_maxi = 0;

static int dtc_wmaxi = 0;

static inline int NCR5380_pread (struct Scsi_Host *instance,

     unsigned char *dst, int len)

     {

   unsigned char *d = dst;

   int i;       /* For counting time spent in the poll-loop */

   NCR5380_local_declare();

   NCR5380_setup(instance);

   i = 0;

   NCR5380_read(RESET_PARITY_INTERRUPT_REG);

   NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);

   if (instance->irq == IRQ_NONE)

      NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);

   else

      NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);

   NCR5380_write(DTC_BLK_CNT, len >> 7);        /* Block count */

   rtrc(1);

   while (len > 0) {

      rtrc(2);

      while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)

         ++i;

      rtrc(3);

      memcpy(d, (char *)(base + DTC_DATA_BUF), 128);

      d += 128;

      len -= 128;

      rtrc(7);  /*** with int's on, it sometimes hangs after here.

                 * Looks like something makes HBNR go away. */

   }

   rtrc(4);

   while ( !(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))

      ++i;

   NCR5380_write(MODE_REG, 0); /* Clear the operating mode */

   rtrc(0);

   NCR5380_read(RESET_PARITY_INTERRUPT_REG);

   if (i > dtc_maxi)

      dtc_maxi = i;

   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) {

   int i;

   NCR5380_local_declare();

   NCR5380_setup(instance);

   NCR5380_read(RESET_PARITY_INTERRUPT_REG);

   NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);

   /* set direction (write) */

   if (instance->irq == IRQ_NONE)

      NCR5380_write(DTC_CONTROL_REG, 0);

   else

      NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);

   NCR5380_write(DTC_BLK_CNT, len >> 7);        /* Block count */

   for (i = 0; len > 0; ++i) {

      rtrc(5);

      /* Poll until the host buffer can accept data. */

      while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)

         ++i;

      rtrc(3);

      memcpy((char *)(base + DTC_DATA_BUF), src, 128);

      src += 128;

      len -= 128;

   }

   rtrc(4);

   while ( !(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))

      ++i;

   rtrc(6);

   /* Wait until the last byte has been sent to the disk */

   while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))

      ++i;

   rtrc(7);

   /* Check for parity error here. fixme. */

   NCR5380_write(MODE_REG, 0); /* Clear the operating mode */

   rtrc(0);

   if (i > dtc_wmaxi)

      dtc_wmaxi = i;

   return (0);

}

#include "NCR5380.c"

#ifdef MODULE

/* Eventually this will go into an include file, but this will be later */

Scsi_Host_Template driver_template = DTC3x80;

#include "scsi_module.c"

#endif