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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/module.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>

#include <linux/init.h>

#define DTC_PUBLIC_RELEASE 2

/*#define DTCDEBUG 0x1*/

#define DTCDEBUG_INIT   0x1

#define DTCDEBUG_TRANSFER 0x2

/*

 * The DTC3180 & 3280 boards are memory mapped.

 *

 */

/*

 */

/* Offset from DTC_5380_OFFSET */

#define DTC_CONTROL_REG         0x100   /* rw */

#define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */

#define CSR_DIR_READ            0x40    /* rw direction, 1 = read 0 = write */

#define CSR_RESET              0x80     /* wo  Resets 53c400 */

#define CSR_5380_REG           0x80     /* ro  5380 registers can be accessed */

#define CSR_TRANS_DIR          0x40     /* rw  Data transfer direction */

#define CSR_SCSI_BUFF_INTR     0x20     /* rw  Enable int on transfer ready */

#define CSR_5380_INTR          0x10     /* rw  Enable 5380 interrupts */

#define CSR_SHARED_INTR        0x08     /* rw  Interrupt sharing */

#define CSR_HOST_BUF_NOT_RDY   0x04     /* ro  Host buffer not ready */

#define CSR_SCSI_BUF_RDY       0x02     /* ro  SCSI buffer ready */

#define CSR_GATED_5380_IRQ     0x01     /* ro  Last block xferred */

#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)

#define DTC_BLK_CNT             0x101   /* rw 

                                         * # of 128-byte blocks to transfer */

#define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */

#define DTC_SWITCH_REG          0x3982  /* ro - DIP switches */

#define DTC_RESUME_XFER         0x3982  /* wo - resume data xfer 

                                           * after disconnect/reconnect */

#define DTC_5380_OFFSET         0x3880  /* 8 registers here, see NCR5380.h */

/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */

#define DTC_DATA_BUF            0x3900  /* rw 128 bytes long */

static struct override {

        unsigned int address;

        int irq;

} overrides

#ifdef OVERRIDE

[] __initdata = OVERRIDE;

#else

[4] __initdata = {

        {0, IRQ_AUTO},

        {0, IRQ_AUTO},

        {0, IRQ_AUTO},

        {0, IRQ_AUTO}

};

#endif

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

static struct base {

        unsigned long address;

        int noauto;

} bases[] __initdata = {

        {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))

/**

 *      dtc_setup       -       option setup for dtc3x80

 *

 *      LILO command line initialization of the overrides array,

 */

static int __init dtc_setup(char *str)

{

        static int commandline_current = 0;

        int i;

        int ints[10];

        get_options(str, sizeof(ints) / sizeof(int), ints);

        if (ints[0] != 2)

                printk(KERN_ERR "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;

        }

        return 1;

}

__setup("dtc=", dtc_setup);

/**

 *      dtc_detect      -       detect DTC 3x80 controllers

 *      @tpnt: controller template

 *

 *      Detects and initializes DTC 3180/3280 controllers

 *      that were autoprobed, overridden on the LILO command line,

 *      or specified at compile time.

 */

int __init dtc_detect(Scsi_Host_Template * tpnt)

{

        static int current_override = 0, current_base = 0;

        struct Scsi_Host *instance;

        unsigned int base;

        int sig, count;

        tpnt->proc_name = "dtc3x80";

        tpnt->proc_info = &dtc_proc_info;

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

        {

                base = 0;

                if (overrides[current_override].address)

                        base = overrides[current_override].address;

                else

                {

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

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

                                {

                                        if (!bases[current_base].noauto && isa_check_signature(bases[current_base].address + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {

                                                base = bases[current_base].address;

                                                break;

                                        }

                                }

                        }

                }

                if (!base)

                        break;

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

                if (instance == NULL)

                        break;

                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 figure it out. */

                if (instance->irq != SCSI_IRQ_NONE)

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

                        {

                                printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);

                                instance->irq = SCSI_IRQ_NONE;

                        }

                if (instance->irq == SCSI_IRQ_NONE) {

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

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

                }

#else

                if (instance->irq != SCSI_IRQ_NONE)

                        printk(KERN_INFO "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);

                instance->irq = SCSI_IRQ_NONE;

#endif

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

                NCR5380_print_options(instance);

                printk("\n");

                ++current_override;

                ++count;

        }

        return count;

}

/**

 *      dtc_biosparam           -       compute disk geometry

 *      @disk: disk to generate for

 *      @dev: major/minor of device

 *      @ip: returned geometry

 *

 *      Generates a BIOS / DOS compatible H-C-S mapping for

 *      the specified device / size.

 */

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;

}

static int dtc_maxi = 0;

static int dtc_wmaxi = 0;

/**

 *      NCR5380_pread           -       fast pseudo DMA read

 *      @instance: controller

 *      @dst: destination buffer

 *      @len: expected/max size

 *

 *      Fast 5380 pseudo-dma read function, reads len bytes from the controller

 *      mmio area into dst.

 */

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 == SCSI_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);

                isa_memcpy_fromio(d, 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);

}

/**

 *      NCR5380_pwrite          -       fast pseudo DMA write

 *      @instance: controller

 *      @dst: destination buffer

 *      @len: expected/max size

 *

 *      Fast 5380 pseudo-dma write function, writes len bytes to the

 *      controller mmio area from src.

 */

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 == SCSI_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);

                isa_memcpy_toio(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);

}

MODULE_LICENSE("GPL");

#include "NCR5380.c"

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

static Scsi_Host_Template driver_template = DTC3x80;

#include "scsi_module.c"