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#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: not supported by cvs2svn $

 * Revision 1.1.1.1  2001/07/02 17:58:27  simons

 * Initial revision

 *

 */

#include <asm/system.h>

#include <linux/signal.h>

#include <linux/sched.h>

#include <asm/io.h>

#include <linux/blk.h>

#include "scsi.h"

#include "hosts.h"

#include "t128.h"

#define AUTOPROBE_IRQ

#include "NCR5380.h"

#include "constants.h"

#include "sd.h"

#include<linux/stat.h>

struct proc_dir_entry proc_scsi_t128 = {

    PROC_SCSI_T128, 4, "t128",

    S_IFDIR | S_IRUGO | S_IXUGO, 2

};

static struct override {

    unsigned char *address;

    int irq;

} overrides

#ifdef T128_OVERRIDE

    [] = T128_OVERRIDE;

#else

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

        {NULL,IRQ_AUTO}};

#endif

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

static struct base {

    unsigned char *address;

    int noauto;

} bases[] = {{(unsigned char *) 0xcc000, 0}, {(unsigned char *) 0xc8000, 0},

    {(unsigned char *) 0xdc000, 0}, {(unsigned char *) 0xd8000, 0}};

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

static const struct signature {

    const char *string;

    int offset;

} signatures[] = {

{"TSROM: SCSI BIOS, Version 1.12", 0x36},

};

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

/*

 * 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 t128_setup(char *str, int *ints) {

    static int commandline_current = 0;

    int i;

    if (ints[0] != 2)

        printk("t128_setup : usage t128=address,irq\n");

    else

        if (commandline_current < NO_OVERRIDES) {

            overrides[commandline_current].address = (unsigned char *) ints[1];

            overrides[commandline_current].irq = ints[2];

            for (i = 0; i < NO_BASES; ++i)

                if (bases[i].address == (unsigned char *) ints[1]) {

                    bases[i].noauto = 1;

                    break;

                }

            ++commandline_current;

        }

}

/*

 * Function : int t128_detect(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 t128_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_t128;

    tpnt->proc_info = &t128_proc_info;

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

        base = NULL;

        if (overrides[current_override].address)

            base = overrides[current_override].address;

        else

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

#if (TDEBUG & TDEBUG_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

                        (bases[current_base].address + signatures[sig].offset,

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

                        base = bases[current_base].address;

#if (TDEBUG & TDEBUG_INIT)

                        printk("scsi-t128 : detected board.\n");

#endif

                        break;

                    }

            }

#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)

        printk("scsi-t128 : 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);

        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 != IRQ_NONE)

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

                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);

        }

#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)

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

#endif

        printk("scsi%d : at 0x%08x", 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, T128_PUBLIC_RELEASE);

        NCR5380_print_options(instance);

        printk("\n");

        ++current_override;

        ++count;

    }

    return count;

}

/*

 * Function : int t128_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 t128_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, 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) {

    register unsigned char *reg = (unsigned char *) (instance->base +

        T_DATA_REG_OFFSET), *d = dst;

    register int i = len;

#if 0

    for (; i; --i) {

        while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();

#else

    while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();

    for (; i; --i) {

#endif

        *d++ = *reg;

    }

    if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {

        unsigned char tmp;

        volatile unsigned char *foo;

        foo = instance->base + T_CONTROL_REG_OFFSET;

        tmp = *foo;

        *foo = tmp | T_CR_CT;

        *foo = tmp;

        printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",

            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) {

    register unsigned char *reg = (unsigned char *) (instance->base +

        T_DATA_REG_OFFSET), *s = src;

    register int i = len;

#if 0

    for (; i; --i) {

        while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();

#else

    while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();

    for (; i; --i) {

#endif

        *reg = *s++;

    }

    if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {

        unsigned char tmp;

        volatile unsigned char *foo;

        foo = instance->base + T_CONTROL_REG_OFFSET;

        tmp = *foo;

        *foo = tmp | T_CR_CT;

        *foo = tmp;

        printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",

            instance->host_no);

        return -1;

    } else

        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 = TRANTOR_T128;

#include "scsi_module.c"

#endif