Merge git://git.infradead.org/mtd-2.6

[mirror_ubuntu-zesty-kernel.git] / drivers / scsi / g_NCR5380.c

/*
 * Generic Generic NCR5380 driver
 *      
 * Copyright 1993, Drew Eckhardt
 *      Visionary Computing
 *      (Unix and Linux consulting and custom programming)
 *      drew@colorado.edu
 *      +1 (303) 440-4894
 *
 * NCR53C400 extensions (c) 1994,1995,1996, Kevin Lentin
 *    K.Lentin@cs.monash.edu.au
 *
 * NCR53C400A extensions (c) 1996, Ingmar Baumgart
 *    ingmar@gonzo.schwaben.de
 *
 * DTC3181E extensions (c) 1997, Ronald van Cuijlenborg
 * ronald.van.cuijlenborg@tip.nl or nutty@dds.nl
 *
 * Added ISAPNP support for DTC436 adapters,
 * Thomas Sailer, sailer@ife.ee.ethz.ch
 *
 * ALPHA RELEASE 1. 
 *
 * For more information, please consult 
 *
 * NCR 5380 Family
 * SCSI Protocol Controller
 * Databook
 *
 * NCR Microelectronics
 * 1635 Aeroplaza Drive
 * Colorado Springs, CO 80916
 * 1+ (719) 578-3400
 * 1+ (800) 334-5454
 */

/* 
 * TODO : flesh out DMA support, find some one actually using this (I have
 *      a memory mapped Trantor board that works fine)
 */

/*
 * Options :
 *
 * PARITY - enable parity checking.  Not supported.
 *
 * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
 *
 * USLEEP - enable support for devices that don't disconnect.  Untested.
 *
 * The card is detected and initialized in one of several ways : 
 * 1.  With command line overrides - NCR5380=port,irq may be 
 *     used on the LILO command line to override the defaults.
 *
 * 2.  With the GENERIC_NCR5380_OVERRIDE compile time define.  This is 
 *     specified as an array of address, irq, dma, board tuples.  Ie, for
 *     one board at 0x350, IRQ5, no dma, I could say  
 *     -DGENERIC_NCR5380_OVERRIDE={{0xcc000, 5, DMA_NONE, BOARD_NCR5380}}
 * 
 * -1 should be specified for no or DMA interrupt, -2 to autoprobe for an 
 *      IRQ line if overridden on the command line.
 *
 * 3.  When included as a module, with arguments passed on the command line:
 *         ncr_irq=xx   the interrupt
 *         ncr_addr=xx  the port or base address (for port or memory
 *                      mapped, resp.)
 *         ncr_dma=xx   the DMA
 *         ncr_5380=1   to set up for a NCR5380 board
 *         ncr_53c400=1 to set up for a NCR53C400 board
 *     e.g.
 *     modprobe g_NCR5380 ncr_irq=5 ncr_addr=0x350 ncr_5380=1
 *       for a port mapped NCR5380 board or
 *     modprobe g_NCR5380 ncr_irq=255 ncr_addr=0xc8000 ncr_53c400=1
 *       for a memory mapped NCR53C400 board with interrupts disabled.
 * 
 * 255 should be specified for no or DMA interrupt, 254 to autoprobe for an 
 *      IRQ line if overridden on the command line.
 *     
 */

/*
 * $Log: generic_NCR5380.c,v $
 */

/* settings for DTC3181E card with only Mustek scanner attached */
#define USLEEP
#define USLEEP_POLL     1
#define USLEEP_SLEEP    20
#define USLEEP_WAITLONG 500

#define AUTOPROBE_IRQ
#define AUTOSENSE


#ifdef CONFIG_SCSI_GENERIC_NCR53C400
#define NCR53C400_PSEUDO_DMA 1
#define PSEUDO_DMA
#define NCR53C400
#define NCR5380_STATS
#undef NCR5380_STAT_LIMIT
#endif

#include <asm/system.h>
#include <asm/io.h>
#include <linux/signal.h>
#include <linux/blkdev.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include "g_NCR5380.h"
#include "NCR5380.h"
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/isapnp.h>
#include <linux/delay.h>
#include <linux/interrupt.h>

#define NCR_NOT_SET 0
static int ncr_irq = NCR_NOT_SET;
static int ncr_dma = NCR_NOT_SET;
static int ncr_addr = NCR_NOT_SET;
static int ncr_5380 = NCR_NOT_SET;
static int ncr_53c400 = NCR_NOT_SET;
static int ncr_53c400a = NCR_NOT_SET;
static int dtc_3181e = NCR_NOT_SET;

static struct override {
        NCR5380_map_type NCR5380_map_name;
        int irq;
        int dma;
        int board;              /* Use NCR53c400, Ricoh, etc. extensions ? */
} overrides
#ifdef GENERIC_NCR5380_OVERRIDE
[] __initdata = GENERIC_NCR5380_OVERRIDE;
#else
[1] __initdata = { { 0,},};
#endif

#define NO_OVERRIDES ARRAY_SIZE(overrides)

#ifndef MODULE

/**
 *      internal_setup          -       handle lilo command string override
 *      @board: BOARD_* identifier for the board
 *      @str: unused
 *      @ints: numeric parameters
 *
 *      Do LILO command line initialization of the overrides array. Display
 *      errors when needed
 *
 *      Locks: none
 */

static void __init internal_setup(int board, char *str, int *ints)
{
        static int commandline_current = 0;
        switch (board) {
        case BOARD_NCR5380:
                if (ints[0] != 2 && ints[0] != 3) {
                        printk(KERN_ERR "generic_NCR5380_setup : usage ncr5380=" STRVAL(NCR5380_map_name) ",irq,dma\n");
                        return;
                }
                break;
        case BOARD_NCR53C400:
                if (ints[0] != 2) {
                        printk(KERN_ERR "generic_NCR53C400_setup : usage ncr53c400=" STRVAL(NCR5380_map_name) ",irq\n");
                        return;
                }
                break;
        case BOARD_NCR53C400A:
                if (ints[0] != 2) {
                        printk(KERN_ERR "generic_NCR53C400A_setup : usage ncr53c400a=" STRVAL(NCR5380_map_name) ",irq\n");
                        return;
                }
                break;
        case BOARD_DTC3181E:
                if (ints[0] != 2) {
                        printk("generic_DTC3181E_setup : usage dtc3181e=" STRVAL(NCR5380_map_name) ",irq\n");
                        return;
                }
                break;
        }

        if (commandline_current < NO_OVERRIDES) {
                overrides[commandline_current].NCR5380_map_name = (NCR5380_map_type) ints[1];
                overrides[commandline_current].irq = ints[2];
                if (ints[0] == 3)
                        overrides[commandline_current].dma = ints[3];
                else
                        overrides[commandline_current].dma = DMA_NONE;
                overrides[commandline_current].board = board;
                ++commandline_current;
        }
}


/**
 *      do_NCR53C80_setup               -       set up entry point
 *      @str: unused
 *
 *      Setup function invoked at boot to parse the ncr5380= command
 *      line.
 */

static int __init do_NCR5380_setup(char *str)
{
        int ints[10];

        get_options(str, ARRAY_SIZE(ints), ints);
        internal_setup(BOARD_NCR5380, str, ints);
        return 1;
}

/**
 *      do_NCR53C400_setup              -       set up entry point
 *      @str: unused
 *      @ints: integer parameters from kernel setup code
 *
 *      Setup function invoked at boot to parse the ncr53c400= command
 *      line.
 */

static int __init do_NCR53C400_setup(char *str)
{
        int ints[10];

        get_options(str, ARRAY_SIZE(ints), ints);
        internal_setup(BOARD_NCR53C400, str, ints);
        return 1;
}

/**
 *      do_NCR53C400A_setup     -       set up entry point
 *      @str: unused
 *      @ints: integer parameters from kernel setup code
 *
 *      Setup function invoked at boot to parse the ncr53c400a= command
 *      line.
 */

static int __init do_NCR53C400A_setup(char *str)
{
        int ints[10];

        get_options(str, ARRAY_SIZE(ints), ints);
        internal_setup(BOARD_NCR53C400A, str, ints);
        return 1;
}

/**
 *      do_DTC3181E_setup       -       set up entry point
 *      @str: unused
 *      @ints: integer parameters from kernel setup code
 *
 *      Setup function invoked at boot to parse the dtc3181e= command
 *      line.
 */

static int __init do_DTC3181E_setup(char *str)
{
        int ints[10];

        get_options(str, ARRAY_SIZE(ints), ints);
        internal_setup(BOARD_DTC3181E, str, ints);
        return 1;
}

#endif

/**
 *      generic_NCR5380_detect  -       look for NCR5380 controllers
 *      @tpnt: the scsi template
 *
 *      Scan for the present of NCR5380, NCR53C400, NCR53C400A, DTC3181E
 *      and DTC436(ISAPnP) controllers. If overrides have been set we use
 *      them.
 *
 *      The caller supplied NCR5380_init function is invoked from here, before
 *      the interrupt line is taken.
 *
 *      Locks: none
 */

int __init generic_NCR5380_detect(struct scsi_host_template * tpnt)
{
        static int current_override = 0;
        int count, i;
        unsigned int *ports;
        unsigned long region_size = 16;
        static unsigned int __initdata ncr_53c400a_ports[] = {
                0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0
        };
        static unsigned int __initdata dtc_3181e_ports[] = {
                0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
        };
        int flags = 0;
        struct Scsi_Host *instance;
#ifdef CONFIG_SCSI_G_NCR5380_MEM
        unsigned long base;
        void __iomem *iomem;
#endif

        if (ncr_irq != NCR_NOT_SET)
                overrides[0].irq = ncr_irq;
        if (ncr_dma != NCR_NOT_SET)
                overrides[0].dma = ncr_dma;
        if (ncr_addr != NCR_NOT_SET)
                overrides[0].NCR5380_map_name = (NCR5380_map_type) ncr_addr;
        if (ncr_5380 != NCR_NOT_SET)
                overrides[0].board = BOARD_NCR5380;
        else if (ncr_53c400 != NCR_NOT_SET)
                overrides[0].board = BOARD_NCR53C400;
        else if (ncr_53c400a != NCR_NOT_SET)
                overrides[0].board = BOARD_NCR53C400A;
        else if (dtc_3181e != NCR_NOT_SET)
                overrides[0].board = BOARD_DTC3181E;

        if (!current_override && isapnp_present()) {
                struct pnp_dev *dev = NULL;
                count = 0;
                while ((dev = pnp_find_dev(NULL, ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e), dev))) {
                        if (count >= NO_OVERRIDES)
                                break;
                        if (pnp_device_attach(dev) < 0) {
                                printk(KERN_ERR "dtc436e probe: attach failed\n");
                                continue;
                        }
                        if (pnp_activate_dev(dev) < 0) {
                                printk(KERN_ERR "dtc436e probe: activate failed\n");
                                pnp_device_detach(dev);
                                continue;
                        }
                        if (!pnp_port_valid(dev, 0)) {
                                printk(KERN_ERR "dtc436e probe: no valid port\n");
                                pnp_device_detach(dev);
                                continue;
                        }
                        if (pnp_irq_valid(dev, 0))
                                overrides[count].irq = pnp_irq(dev, 0);
                        else
                                overrides[count].irq = SCSI_IRQ_NONE;
                        if (pnp_dma_valid(dev, 0))
                                overrides[count].dma = pnp_dma(dev, 0);
                        else
                                overrides[count].dma = DMA_NONE;
                        overrides[count].NCR5380_map_name = (NCR5380_map_type) pnp_port_start(dev, 0);
                        overrides[count].board = BOARD_DTC3181E;
                        count++;
                }
        }

        tpnt->proc_name = "g_NCR5380";

        for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
                if (!(overrides[current_override].NCR5380_map_name))
                        continue;

                ports = NULL;
                switch (overrides[current_override].board) {
                case BOARD_NCR5380:
                        flags = FLAG_NO_PSEUDO_DMA;
                        break;
                case BOARD_NCR53C400:
                        flags = FLAG_NCR53C400;
                        break;
                case BOARD_NCR53C400A:
                        flags = FLAG_NO_PSEUDO_DMA;
                        ports = ncr_53c400a_ports;
                        break;
                case BOARD_DTC3181E:
                        flags = FLAG_NO_PSEUDO_DMA | FLAG_DTC3181E;
                        ports = dtc_3181e_ports;
                        break;
                }

#ifndef CONFIG_SCSI_G_NCR5380_MEM
                if (ports) {
                        /* wakeup sequence for the NCR53C400A and DTC3181E */

                        /* Disable the adapter and look for a free io port */
                        outb(0x59, 0x779);
                        outb(0xb9, 0x379);
                        outb(0xc5, 0x379);
                        outb(0xae, 0x379);
                        outb(0xa6, 0x379);
                        outb(0x00, 0x379);

                        if (overrides[current_override].NCR5380_map_name != PORT_AUTO)
                                for (i = 0; ports[i]; i++) {
                                        if (!request_region(ports[i],  16, "ncr53c80"))
                                                continue;
                                        if (overrides[current_override].NCR5380_map_name == ports[i])
                                                break;
                                        release_region(ports[i], 16);
                        } else
                                for (i = 0; ports[i]; i++) {
                                        if (!request_region(ports[i],  16, "ncr53c80"))
                                                continue;
                                        if (inb(ports[i]) == 0xff)
                                                break;
                                        release_region(ports[i], 16);
                                }
                        if (ports[i]) {
                                /* At this point we have our region reserved */
                                outb(0x59, 0x779);
                                outb(0xb9, 0x379);
                                outb(0xc5, 0x379);
                                outb(0xae, 0x379);
                                outb(0xa6, 0x379);
                                outb(0x80 | i, 0x379);  /* set io port to be used */
                                outb(0xc0, ports[i] + 9);
                                if (inb(ports[i] + 9) != 0x80)
                                        continue;
                                else
                                        overrides[current_override].NCR5380_map_name = ports[i];
                        } else
                                continue;
                }
                else
                {
                        /* Not a 53C400A style setup - just grab */
                        if(!(request_region(overrides[current_override].NCR5380_map_name, NCR5380_region_size, "ncr5380")))
                                continue;
                        region_size = NCR5380_region_size;
                }
#else
                base = overrides[current_override].NCR5380_map_name;
                if (!request_mem_region(base, NCR5380_region_size, "ncr5380"))
                        continue;
                iomem = ioremap(base, NCR5380_region_size);
                if (!iomem) {
                        release_mem_region(base, NCR5380_region_size);
                        continue;
                }
#endif
                instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
                if (instance == NULL) {
#ifndef CONFIG_SCSI_G_NCR5380_MEM
                        release_region(overrides[current_override].NCR5380_map_name, region_size);
#else
                        iounmap(iomem);
                        release_mem_region(base, NCR5380_region_size);
#endif
                        continue;
                }

                instance->NCR5380_instance_name = overrides[current_override].NCR5380_map_name;
#ifndef CONFIG_SCSI_G_NCR5380_MEM
                instance->n_io_port = region_size;
#else
                ((struct NCR5380_hostdata *)instance->hostdata).iomem = iomem;
#endif

                NCR5380_init(instance, flags);

                if (overrides[current_override].irq != IRQ_AUTO)
                        instance->irq = overrides[current_override].irq;
                else
                        instance->irq = NCR5380_probe_irq(instance, 0xffff);

                if (instance->irq != SCSI_IRQ_NONE)
                        if (request_irq(instance->irq, generic_NCR5380_intr, IRQF_DISABLED, "NCR5380", instance)) {
                                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);
                }

                printk(KERN_INFO "scsi%d : at " STRVAL(NCR5380_map_name) " 0x%x", instance->host_no, (unsigned int) instance->NCR5380_instance_name);
                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, GENERIC_NCR5380_PUBLIC_RELEASE);
                NCR5380_print_options(instance);
                printk("\n");

                ++current_override;
                ++count;
        }
        return count;
}

/**
 *      generic_NCR5380_info    -       reporting string
 *      @host: NCR5380 to report on
 *
 *      Report driver information for the NCR5380
 */
        
const char *generic_NCR5380_info(struct Scsi_Host *host)
{
        static const char string[] = "Generic NCR5380/53C400 Driver";
        return string;
}

/**
 *      generic_NCR5380_release_resources       -       free resources
 *      @instance: host adapter to clean up 
 *
 *      Free the generic interface resources from this adapter.
 *
 *      Locks: none
 */
 
int generic_NCR5380_release_resources(struct Scsi_Host *instance)
{
        NCR5380_local_declare();
        NCR5380_setup(instance);
        
        if (instance->irq != SCSI_IRQ_NONE)
                free_irq(instance->irq, NULL);
        NCR5380_exit(instance);

#ifndef CONFIG_SCSI_G_NCR5380_MEM
        release_region(instance->NCR5380_instance_name, instance->n_io_port);
#else
        iounmap(((struct NCR5380_hostdata *)instance->hostdata).iomem);
        release_mem_region(instance->NCR5380_instance_name, NCR5380_region_size);
#endif


        return 0;
}

#ifdef BIOSPARAM
/**
 *      generic_NCR5380_biosparam
 *      @disk: disk to compute geometry for
 *      @dev: device identifier for this disk
 *      @ip: sizes to fill in
 *
 *      Generates a BIOS / DOS compatible H-C-S mapping for the specified 
 *      device / size.
 * 
 *      XXX Most SCSI boards use this mapping, I could be incorrect.  Someone
 *      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.
 *
 *      Locks: none
 */

static int
generic_NCR5380_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;
}
#endif

#if NCR53C400_PSEUDO_DMA

/**
 *      NCR5380_pread           -       pseudo DMA read
 *      @instance: adapter to read from
 *      @dst: buffer to read into
 *      @len: buffer length
 *
 *      Perform a psuedo DMA mode read from an NCR53C400 or equivalent
 *      controller
 */
 
static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
{
        int blocks = len / 128;
        int start = 0;
        int bl;

        NCR5380_local_declare();
        NCR5380_setup(instance);

        NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE | CSR_TRANS_DIR);
        NCR5380_write(C400_BLOCK_COUNTER_REG, blocks);
        while (1) {
                if ((bl = NCR5380_read(C400_BLOCK_COUNTER_REG)) == 0) {
                        break;
                }
                if (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ) {
                        printk(KERN_ERR "53C400r: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
                        return -1;
                }
                while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY);

#ifndef CONFIG_SCSI_G_NCR5380_MEM
                {
                        int i;
                        for (i = 0; i < 128; i++)
                                dst[start + i] = NCR5380_read(C400_HOST_BUFFER);
                }
#else
                /* implies CONFIG_SCSI_G_NCR5380_MEM */
                memcpy_fromio(dst + start, iomem + NCR53C400_host_buffer, 128);
#endif
                start += 128;
                blocks--;
        }

        if (blocks) {
                while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
                {
                        // FIXME - no timeout
                }

#ifndef CONFIG_SCSI_G_NCR5380_MEM
                {
                        int i;  
                        for (i = 0; i < 128; i++)
                                dst[start + i] = NCR5380_read(C400_HOST_BUFFER);
                }
#else
                /* implies CONFIG_SCSI_G_NCR5380_MEM */
                memcpy_fromio(dst + start, iomem + NCR53C400_host_buffer, 128);
#endif
                start += 128;
                blocks--;
        }

        if (!(NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ))
                printk("53C400r: no 53C80 gated irq after transfer");

#if 0
        /*
         *      DON'T DO THIS - THEY NEVER ARRIVE!
         */
        printk("53C400r: Waiting for 53C80 registers\n");
        while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_53C80_REG)
                ;
#endif
        if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER))
                printk(KERN_ERR "53C400r: no end dma signal\n");
                
        NCR5380_write(MODE_REG, MR_BASE);
        NCR5380_read(RESET_PARITY_INTERRUPT_REG);
        return 0;
}

/**
 *      NCR5380_write           -       pseudo DMA write
 *      @instance: adapter to read from
 *      @dst: buffer to read into
 *      @len: buffer length
 *
 *      Perform a psuedo DMA mode read from an NCR53C400 or equivalent
 *      controller
 */

static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
{
        int blocks = len / 128;
        int start = 0;
        int bl;
        int i;

        NCR5380_local_declare();
        NCR5380_setup(instance);

        NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
        NCR5380_write(C400_BLOCK_COUNTER_REG, blocks);
        while (1) {
                if (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ) {
                        printk(KERN_ERR "53C400w: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
                        return -1;
                }

                if ((bl = NCR5380_read(C400_BLOCK_COUNTER_REG)) == 0) {
                        break;
                }
                while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
                        ; // FIXME - timeout
#ifndef CONFIG_SCSI_G_NCR5380_MEM
                {
                        for (i = 0; i < 128; i++)
                                NCR5380_write(C400_HOST_BUFFER, src[start + i]);
                }
#else
                /* implies CONFIG_SCSI_G_NCR5380_MEM */
                memcpy_toio(iomem + NCR53C400_host_buffer, src + start, 128);
#endif
                start += 128;
                blocks--;
        }
        if (blocks) {
                while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
                        ; // FIXME - no timeout

#ifndef CONFIG_SCSI_G_NCR5380_MEM
                {
                        for (i = 0; i < 128; i++)
                                NCR5380_write(C400_HOST_BUFFER, src[start + i]);
                }
#else
                /* implies CONFIG_SCSI_G_NCR5380_MEM */
                memcpy_toio(iomem + NCR53C400_host_buffer, src + start, 128);
#endif
                start += 128;
                blocks--;
        }

#if 0
        printk("53C400w: waiting for registers to be available\n");
        THEY NEVER DO ! while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_53C80_REG);
        printk("53C400w: Got em\n");
#endif

        /* Let's wait for this instead - could be ugly */
        /* All documentation says to check for this. Maybe my hardware is too
         * fast. Waiting for it seems to work fine! KLL
         */
        while (!(i = NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ))
                ;       // FIXME - no timeout

        /*
         * I know. i is certainly != 0 here but the loop is new. See previous
         * comment.
         */
        if (i) {
                if (!((i = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_END_DMA_TRANSFER))
                        printk(KERN_ERR "53C400w: No END OF DMA bit - WHOOPS! BASR=%0x\n", i);
        } else
                printk(KERN_ERR "53C400w: no 53C80 gated irq after transfer (last block)\n");

#if 0
        if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER)) {
                printk(KERN_ERR "53C400w: no end dma signal\n");
        }
#endif
        while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
                ;       // TIMEOUT
        return 0;
}
#endif                          /* PSEUDO_DMA */

/*
 *      Include the NCR5380 core code that we build our driver around   
 */
 
#include "NCR5380.c"

#define PRINTP(x) len += sprintf(buffer+len, x)
#define ANDP ,

static int sprint_opcode(char *buffer, int len, int opcode)
{
        int start = len;
        PRINTP("0x%02x " ANDP opcode);
        return len - start;
}

static int sprint_command(char *buffer, int len, unsigned char *command)
{
        int i, s, start = len;
        len += sprint_opcode(buffer, len, command[0]);
        for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
                PRINTP("%02x " ANDP command[i]);
        PRINTP("\n");
        return len - start;
}

/**
 *      sprintf_Scsi_Cmnd       -       print a scsi command
 *      @buffer: buffr to print into
 *      @len: buffer length
 *      @cmd: SCSI command block
 *      
 *      Print out the target and command data in hex
 */

static int sprint_Scsi_Cmnd(char *buffer, int len, Scsi_Cmnd * cmd)
{
        int start = len;
        PRINTP("host number %d destination target %d, lun %d\n" ANDP cmd->device->host->host_no ANDP cmd->device->id ANDP cmd->device->lun);
        PRINTP("        command = ");
        len += sprint_command(buffer, len, cmd->cmnd);
        return len - start;
}

/**
 *      generic_NCR5380_proc_info       -       /proc for NCR5380 driver
 *      @buffer: buffer to print into
 *      @start: start position
 *      @offset: offset into buffer
 *      @len: length
 *      @hostno: instance to affect
 *      @inout: read/write
 *
 *      Provide the procfs information for the 5380 controller. We fill
 *      this with useful debugging information including the commands
 *      being executed, disconnected command queue and the statistical
 *      data
 *
 *      Locks: global cli/lock for queue walk
 */
 
static int generic_NCR5380_proc_info(struct Scsi_Host *scsi_ptr, char *buffer, char **start, off_t offset, int length, int inout)
{
        int len = 0;
        NCR5380_local_declare();
        unsigned long flags;
        unsigned char status;
        int i;
        Scsi_Cmnd *ptr;
        struct NCR5380_hostdata *hostdata;
#ifdef NCR5380_STATS
        struct scsi_device *dev;
#endif

        NCR5380_setup(scsi_ptr);
        hostdata = (struct NCR5380_hostdata *) scsi_ptr->hostdata;

        spin_lock_irqsave(scsi_ptr->host_lock, flags);
        PRINTP("SCSI host number %d : %s\n" ANDP scsi_ptr->host_no ANDP scsi_ptr->hostt->name);
        PRINTP("Generic NCR5380 driver version %d\n" ANDP GENERIC_NCR5380_PUBLIC_RELEASE);
        PRINTP("NCR5380 core version %d\n" ANDP NCR5380_PUBLIC_RELEASE);
#ifdef NCR53C400
        PRINTP("NCR53C400 extension version %d\n" ANDP NCR53C400_PUBLIC_RELEASE);
        PRINTP("NCR53C400 card%s detected\n" ANDP(((struct NCR5380_hostdata *) scsi_ptr->hostdata)->flags & FLAG_NCR53C400) ? "" : " not");
# if NCR53C400_PSEUDO_DMA
        PRINTP("NCR53C400 pseudo DMA used\n");
# endif
#else
        PRINTP("NO NCR53C400 driver extensions\n");
#endif
        PRINTP("Using %s mapping at %s 0x%lx, " ANDP STRVAL(NCR5380_map_config) ANDP STRVAL(NCR5380_map_name) ANDP scsi_ptr->NCR5380_instance_name);
        if (scsi_ptr->irq == SCSI_IRQ_NONE)
                PRINTP("no interrupt\n");
        else
                PRINTP("on interrupt %d\n" ANDP scsi_ptr->irq);

#ifdef NCR5380_STATS
        if (hostdata->connected || hostdata->issue_queue || hostdata->disconnected_queue)
                PRINTP("There are commands pending, transfer rates may be crud\n");
        if (hostdata->pendingr)
                PRINTP("  %d pending reads" ANDP hostdata->pendingr);
        if (hostdata->pendingw)
                PRINTP("  %d pending writes" ANDP hostdata->pendingw);
        if (hostdata->pendingr || hostdata->pendingw)
                PRINTP("\n");
        shost_for_each_device(dev, scsi_ptr) {
                unsigned long br = hostdata->bytes_read[dev->id];
                unsigned long bw = hostdata->bytes_write[dev->id];
                long tr = hostdata->time_read[dev->id] / HZ;
                long tw = hostdata->time_write[dev->id] / HZ;

                PRINTP("  T:%d %s " ANDP dev->id ANDP scsi_device_type(dev->type));
                for (i = 0; i < 8; i++)
                        if (dev->vendor[i] >= 0x20)
                                *(buffer + (len++)) = dev->vendor[i];
                *(buffer + (len++)) = ' ';
                for (i = 0; i < 16; i++)
                        if (dev->model[i] >= 0x20)
                                *(buffer + (len++)) = dev->model[i];
                *(buffer + (len++)) = ' ';
                for (i = 0; i < 4; i++)
                        if (dev->rev[i] >= 0x20)
                                *(buffer + (len++)) = dev->rev[i];
                *(buffer + (len++)) = ' ';

                PRINTP("\n%10ld kb read    in %5ld secs" ANDP br / 1024 ANDP tr);
                if (tr)
                        PRINTP(" @ %5ld bps" ANDP br / tr);

                PRINTP("\n%10ld kb written in %5ld secs" ANDP bw / 1024 ANDP tw);
                if (tw)
                        PRINTP(" @ %5ld bps" ANDP bw / tw);
                PRINTP("\n");
        }
#endif

        status = NCR5380_read(STATUS_REG);
        if (!(status & SR_REQ))
                PRINTP("REQ not asserted, phase unknown.\n");
        else {
                for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
                PRINTP("Phase %s\n" ANDP phases[i].name);
        }

        if (!hostdata->connected) {
                PRINTP("No currently connected command\n");
        } else {
                len += sprint_Scsi_Cmnd(buffer, len, (Scsi_Cmnd *) hostdata->connected);
        }

        PRINTP("issue_queue\n");

        for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
                len += sprint_Scsi_Cmnd(buffer, len, ptr);

        PRINTP("disconnected_queue\n");

        for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
                len += sprint_Scsi_Cmnd(buffer, len, ptr);

        *start = buffer + offset;
        len -= offset;
        if (len > length)
                len = length;
        spin_unlock_irqrestore(scsi_ptr->host_lock, flags);
        return len;
}

#undef PRINTP
#undef ANDP

static struct scsi_host_template driver_template = {
        .proc_info              = generic_NCR5380_proc_info,
        .name                   = "Generic NCR5380/NCR53C400 Scsi Driver",
        .detect                 = generic_NCR5380_detect,
        .release                = generic_NCR5380_release_resources,
        .info                   = generic_NCR5380_info,
        .queuecommand           = generic_NCR5380_queue_command,
        .eh_abort_handler       = generic_NCR5380_abort,
        .eh_bus_reset_handler   = generic_NCR5380_bus_reset,
        .bios_param             = NCR5380_BIOSPARAM,
        .can_queue              = CAN_QUEUE,
        .this_id                = 7,
        .sg_tablesize           = SG_ALL,
        .cmd_per_lun            = CMD_PER_LUN,
        .use_clustering         = DISABLE_CLUSTERING,
};
#include <linux/module.h>
#include "scsi_module.c"

module_param(ncr_irq, int, 0);
module_param(ncr_dma, int, 0);
module_param(ncr_addr, int, 0);
module_param(ncr_5380, int, 0);
module_param(ncr_53c400, int, 0);
module_param(ncr_53c400a, int, 0);
module_param(dtc_3181e, int, 0);
MODULE_LICENSE("GPL");


static struct isapnp_device_id id_table[] __devinitdata = {
        {
         ISAPNP_ANY_ID, ISAPNP_ANY_ID,
         ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e),
         0},
        {0}
};

MODULE_DEVICE_TABLE(isapnp, id_table);


__setup("ncr5380=", do_NCR5380_setup);
__setup("ncr53c400=", do_NCR53C400_setup);
__setup("ncr53c400a=", do_NCR53C400A_setup);
__setup("dtc3181e=", do_DTC3181E_setup);