/*
 * 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
 */

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

/*
 * 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.
 *     
 */

#define AUTOPROBE_IRQ

#ifdef CONFIG_SCSI_GENERIC_NCR53C400
#define PSEUDO_DMA
#endif

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

static int ncr_irq;
static int ncr_dma;
static int ncr_addr;
static int ncr_5380;
static int ncr_53c400;
static int ncr_53c400a;
static int dtc_3181e;
static int hp_c2502;

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;
        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

#ifndef SCSI_G_NCR5380_MEM
/*
 * Configure I/O address of 53C400A or DTC436 by writing magic numbers
 * to ports 0x779 and 0x379.
 */
static void magic_configure(int idx, u8 irq, u8 magic[])
{
        u8 cfg = 0;

        outb(magic[0], 0x779);
        outb(magic[1], 0x379);
        outb(magic[2], 0x379);
        outb(magic[3], 0x379);
        outb(magic[4], 0x379);

        /* allowed IRQs for HP C2502 */
        if (irq != 2 && irq != 3 && irq != 4 && irq != 5 && irq != 7)
                irq = 0;
        if (idx >= 0 && idx <= 7)
                cfg = 0x80 | idx | (irq << 4);
        outb(cfg, 0x379);
}
#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.
 *
 *      Locks: none
 */

static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
{
        static int current_override;
        int count;
        unsigned int *ports;
        u8 *magic = NULL;
#ifndef SCSI_G_NCR5380_MEM
        int i;
        int port_idx = -1;
        unsigned long region_size = 16;
#endif
        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
        };
        static u8 ncr_53c400a_magic[] __initdata = {    /* 53C400A & DTC436 */
                0x59, 0xb9, 0xc5, 0xae, 0xa6
        };
        static u8 hp_c2502_magic[] __initdata = {       /* HP C2502 */
                0x0f, 0x22, 0xf0, 0x20, 0x80
        };
        int flags;
        struct Scsi_Host *instance;
        struct NCR5380_hostdata *hostdata;
#ifdef SCSI_G_NCR5380_MEM
        unsigned long base;
        void __iomem *iomem;
#endif

        if (ncr_irq)
                overrides[0].irq = ncr_irq;
        if (ncr_dma)
                overrides[0].dma = ncr_dma;
        if (ncr_addr)
                overrides[0].NCR5380_map_name = (NCR5380_map_type) ncr_addr;
        if (ncr_5380)
                overrides[0].board = BOARD_NCR5380;
        else if (ncr_53c400)
                overrides[0].board = BOARD_NCR53C400;
        else if (ncr_53c400a)
                overrides[0].board = BOARD_NCR53C400A;
        else if (dtc_3181e)
                overrides[0].board = BOARD_DTC3181E;
        else if (hp_c2502)
                overrides[0].board = BOARD_HP_C2502;
#ifndef SCSI_G_NCR5380_MEM
        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)
                                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 = NO_IRQ;
                        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++;
                }
        }
#endif

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

                ports = NULL;
                flags = 0;
                switch (overrides[current_override].board) {
                case BOARD_NCR5380:
                        flags = FLAG_NO_PSEUDO_DMA;
                        break;
                case BOARD_NCR53C400:
#ifdef PSEUDO_DMA
                        flags = FLAG_NO_DMA_FIXUP;
#endif
                        break;
                case BOARD_NCR53C400A:
                        flags = FLAG_NO_DMA_FIXUP;
                        ports = ncr_53c400a_ports;
                        magic = ncr_53c400a_magic;
                        break;
                case BOARD_HP_C2502:
                        flags = FLAG_NO_DMA_FIXUP;
                        ports = ncr_53c400a_ports;
                        magic = hp_c2502_magic;
                        break;
                case BOARD_DTC3181E:
                        flags = FLAG_NO_DMA_FIXUP;
                        ports = dtc_3181e_ports;
                        magic = ncr_53c400a_magic;
                        break;
                }

#ifndef SCSI_G_NCR5380_MEM
                if (ports && magic) {
                        /* wakeup sequence for the NCR53C400A and DTC3181E */

                        /* Disable the adapter and look for a free io port */
                        magic_configure(-1, 0, magic);

                        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 */
                                magic_configure(i, 0, magic); /* no IRQ yet */
                                outb(0xc0, ports[i] + 9);
                                if (inb(ports[i] + 9) != 0x80)
                                        continue;
                                overrides[current_override].NCR5380_map_name = ports[i];
                                port_idx = 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)
                        goto out_release;
                hostdata = shost_priv(instance);

#ifndef SCSI_G_NCR5380_MEM
                instance->io_port = overrides[current_override].NCR5380_map_name;
                instance->n_io_port = region_size;
                hostdata->io_width = 1; /* 8-bit PDMA by default */

                /*
                 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
                 * the base address.
                 */
                switch (overrides[current_override].board) {
                case BOARD_NCR53C400:
                        instance->io_port += 8;
                        hostdata->c400_ctl_status = 0;
                        hostdata->c400_blk_cnt = 1;
                        hostdata->c400_host_buf = 4;
                        break;
                case BOARD_DTC3181E:
                        hostdata->io_width = 2; /* 16-bit PDMA */
                        /* fall through */
                case BOARD_NCR53C400A:
                case BOARD_HP_C2502:
                        hostdata->c400_ctl_status = 9;
                        hostdata->c400_blk_cnt = 10;
                        hostdata->c400_host_buf = 8;
                        break;
                }
#else
                instance->base = overrides[current_override].NCR5380_map_name;
                hostdata->iomem = iomem;
                switch (overrides[current_override].board) {
                case BOARD_NCR53C400:
                        hostdata->c400_ctl_status = 0x100;
                        hostdata->c400_blk_cnt = 0x101;
                        hostdata->c400_host_buf = 0x104;
                        break;
                case BOARD_DTC3181E:
                case BOARD_NCR53C400A:
                case BOARD_HP_C2502:
                        pr_err(DRV_MODULE_NAME ": unknown register offsets\n");
                        goto out_unregister;
                }
#endif

                if (NCR5380_init(instance, flags))
                        goto out_unregister;

                switch (overrides[current_override].board) {
                case BOARD_NCR53C400:
                case BOARD_DTC3181E:
                case BOARD_NCR53C400A:
                case BOARD_HP_C2502:
                        NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
                }

                NCR5380_maybe_reset_bus(instance);

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

                /* Compatibility with documented NCR5380 kernel parameters */
                if (instance->irq == 255)
                        instance->irq = NO_IRQ;

                if (instance->irq != NO_IRQ) {
#ifndef SCSI_G_NCR5380_MEM
                        /* set IRQ for HP C2502 */
                        if (overrides[current_override].board == BOARD_HP_C2502)
                                magic_configure(port_idx, instance->irq, magic);
#endif
                        if (request_irq(instance->irq, generic_NCR5380_intr,
                                        0, "NCR5380", instance)) {
                                printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
                                instance->irq = NO_IRQ;
                        }
                }

                if (instance->irq == NO_IRQ) {
                        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);
                }

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

out_unregister:
        scsi_unregister(instance);
out_release:
#ifndef 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
        return count;
}

/**
 *      generic_NCR5380_release_resources       -       free resources
 *      @instance: host adapter to clean up 
 *
 *      Free the generic interface resources from this adapter.
 *
 *      Locks: none
 */
 
static int generic_NCR5380_release_resources(struct Scsi_Host *instance)
{
        if (instance->irq != NO_IRQ)
                free_irq(instance->irq, instance);
        NCR5380_exit(instance);
#ifndef SCSI_G_NCR5380_MEM
        release_region(instance->io_port, instance->n_io_port);
#else
        iounmap(((struct NCR5380_hostdata *)instance->hostdata)->iomem);
        release_mem_region(instance->base, 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

#ifdef PSEUDO_DMA

/**
 *      NCR5380_pread           -       pseudo DMA read
 *      @instance: adapter to read from
 *      @dst: buffer to read into
 *      @len: buffer length
 *
 *      Perform a pseudo DMA mode read from an NCR53C400 or equivalent
 *      controller
 */
 
static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
{
        struct NCR5380_hostdata *hostdata = shost_priv(instance);
        int blocks = len / 128;
        int start = 0;

        NCR5380_write(hostdata->c400_ctl_status, CSR_BASE | CSR_TRANS_DIR);
        NCR5380_write(hostdata->c400_blk_cnt, blocks);
        while (1) {
                if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
                        break;
                if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
                        printk(KERN_ERR "53C400r: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
                        return -1;
                }
                while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
                        ; /* FIXME - no timeout */

#ifndef SCSI_G_NCR5380_MEM
                if (hostdata->io_width == 2)
                        insw(instance->io_port + hostdata->c400_host_buf,
                                                        dst + start, 64);
                else
                        insb(instance->io_port + hostdata->c400_host_buf,
                                                        dst + start, 128);
#else
                /* implies SCSI_G_NCR5380_MEM */
                memcpy_fromio(dst + start,
                              hostdata->iomem + NCR53C400_host_buffer, 128);
#endif
                start += 128;
                blocks--;
        }

        if (blocks) {
                while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
                        ; /* FIXME - no timeout */

#ifndef SCSI_G_NCR5380_MEM
                if (hostdata->io_width == 2)
                        insw(instance->io_port + hostdata->c400_host_buf,
                                                        dst + start, 64);
                else
                        insb(instance->io_port + hostdata->c400_host_buf,
                                                        dst + start, 128);
#else
                /* implies SCSI_G_NCR5380_MEM */
                memcpy_fromio(dst + start,
                              hostdata->iomem + NCR53C400_host_buffer, 128);
#endif
                start += 128;
                blocks--;
        }

        if (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ))
                printk("53C400r: no 53C80 gated irq after transfer");

        /* wait for 53C80 registers to be available */
        while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG))
                ;

        if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER))
                printk(KERN_ERR "53C400r: no end dma signal\n");
                
        return 0;
}

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

static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
{
        struct NCR5380_hostdata *hostdata = shost_priv(instance);
        int blocks = len / 128;
        int start = 0;

        NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
        NCR5380_write(hostdata->c400_blk_cnt, blocks);
        while (1) {
                if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
                        printk(KERN_ERR "53C400w: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
                        return -1;
                }

                if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
                        break;
                while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
                        ; // FIXME - timeout
#ifndef SCSI_G_NCR5380_MEM
                if (hostdata->io_width == 2)
                        outsw(instance->io_port + hostdata->c400_host_buf,
                                                        src + start, 64);
                else
                        outsb(instance->io_port + hostdata->c400_host_buf,
                                                        src + start, 128);
#else
                /* implies SCSI_G_NCR5380_MEM */
                memcpy_toio(hostdata->iomem + NCR53C400_host_buffer,
                            src + start, 128);
#endif
                start += 128;
                blocks--;
        }
        if (blocks) {
                while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
                        ; // FIXME - no timeout

#ifndef SCSI_G_NCR5380_MEM
                if (hostdata->io_width == 2)
                        outsw(instance->io_port + hostdata->c400_host_buf,
                                                        src + start, 64);
                else
                        outsb(instance->io_port + hostdata->c400_host_buf,
                                                        src + start, 128);
#else
                /* implies SCSI_G_NCR5380_MEM */
                memcpy_toio(hostdata->iomem + NCR53C400_host_buffer,
                            src + start, 128);
#endif
                start += 128;
                blocks--;
        }

        /* wait for 53C80 registers to be available */
        while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG)) {
                udelay(4); /* DTC436 chip hangs without this */
                /* FIXME - no timeout */
        }

        if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER)) {
                printk(KERN_ERR "53C400w: no end dma signal\n");
        }

        while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
                ;       // TIMEOUT
        return 0;
}

static int generic_NCR5380_dma_xfer_len(struct scsi_cmnd *cmd)
{
        int transfersize = cmd->transfersize;

        /* Limit transfers to 32K, for xx400 & xx406
         * pseudoDMA that transfers in 128 bytes blocks.
         */
        if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
            !(cmd->SCp.this_residual % transfersize))
                transfersize = 32 * 1024;

        /* 53C400 datasheet: non-modulo-128-byte transfers should use PIO */
        if (transfersize % 128)
                transfersize = 0;

        return transfersize;
}

#endif /* PSEUDO_DMA */

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

static struct scsi_host_template driver_template = {
        .proc_name              = DRV_MODULE_NAME,
        .name                   = "Generic NCR5380/NCR53C400 SCSI",
        .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              = 16,
        .this_id                = 7,
        .sg_tablesize           = SG_ALL,
        .cmd_per_lun            = 2,
        .use_clustering         = DISABLE_CLUSTERING,
        .cmd_size               = NCR5380_CMD_SIZE,
        .max_sectors            = 128,
};

#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_param(hp_c2502, int, 0);
MODULE_LICENSE("GPL");

#if !defined(SCSI_G_NCR5380_MEM) && defined(MODULE)
static struct isapnp_device_id id_table[] = {
        {
         ISAPNP_ANY_ID, ISAPNP_ANY_ID,
         ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e),
         0},
        {0}
};

MODULE_DEVICE_TABLE(isapnp, id_table);
#endif

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