/*
 * NinjaSCSI-32Bi Cardbus, NinjaSCSI-32UDE PCI/CardBus SCSI driver
 * Copyright (C) 2001, 2002, 2003
 *      YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>
 *      GOTO Masanori <gotom@debian.or.jp>, <gotom@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 * Revision History:
 *   1.0: Initial Release.
 *   1.1: Add /proc SDTR status.
 *        Remove obsolete error handler nsp32_reset.
 *        Some clean up.
 *   1.2: PowerPC (big endian) support.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/dma-mapping.h>

#include <asm/dma.h>
#include <asm/io.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>

#include "nsp32.h"


/***********************************************************************
 * Module parameters
 */
static int       trans_mode = 0;        /* default: BIOS */
module_param     (trans_mode, int, 0);
MODULE_PARM_DESC(trans_mode, "transfer mode (0: BIOS(default) 1: Async 2: Ultra20M");
#define ASYNC_MODE    1
#define ULTRA20M_MODE 2

static bool      auto_param = 0;        /* default: ON */
module_param     (auto_param, bool, 0);
MODULE_PARM_DESC(auto_param, "AutoParameter mode (0: ON(default) 1: OFF)");

static bool      disc_priv  = 1;        /* default: OFF */
module_param     (disc_priv, bool, 0);
MODULE_PARM_DESC(disc_priv,  "disconnection privilege mode (0: ON 1: OFF(default))");

MODULE_AUTHOR("YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>, GOTO Masanori <gotom@debian.or.jp>");
MODULE_DESCRIPTION("Workbit NinjaSCSI-32Bi/UDE CardBus/PCI SCSI host bus adapter module");
MODULE_LICENSE("GPL");

static const char *nsp32_release_version = "1.2";


/****************************************************************************
 * Supported hardware
 */
static struct pci_device_id nsp32_pci_table[] = {
        {
                .vendor      = PCI_VENDOR_ID_IODATA,
                .device      = PCI_DEVICE_ID_NINJASCSI_32BI_CBSC_II,
                .subvendor   = PCI_ANY_ID,
                .subdevice   = PCI_ANY_ID,
                .driver_data = MODEL_IODATA,
        },
        {
                .vendor      = PCI_VENDOR_ID_WORKBIT,
                .device      = PCI_DEVICE_ID_NINJASCSI_32BI_KME,
                .subvendor   = PCI_ANY_ID,
                .subdevice   = PCI_ANY_ID,
                .driver_data = MODEL_KME,
        },
        {
                .vendor      = PCI_VENDOR_ID_WORKBIT,
                .device      = PCI_DEVICE_ID_NINJASCSI_32BI_WBT,
                .subvendor   = PCI_ANY_ID,
                .subdevice   = PCI_ANY_ID,
                .driver_data = MODEL_WORKBIT,
        },
        {
                .vendor      = PCI_VENDOR_ID_WORKBIT,
                .device      = PCI_DEVICE_ID_WORKBIT_STANDARD,
                .subvendor   = PCI_ANY_ID,
                .subdevice   = PCI_ANY_ID,
                .driver_data = MODEL_PCI_WORKBIT,
        },
        {
                .vendor      = PCI_VENDOR_ID_WORKBIT,
                .device      = PCI_DEVICE_ID_NINJASCSI_32BI_LOGITEC,
                .subvendor   = PCI_ANY_ID,
                .subdevice   = PCI_ANY_ID,
                .driver_data = MODEL_LOGITEC,
        },
        {
                .vendor      = PCI_VENDOR_ID_WORKBIT,
                .device      = PCI_DEVICE_ID_NINJASCSI_32BIB_LOGITEC,
                .subvendor   = PCI_ANY_ID,
                .subdevice   = PCI_ANY_ID,
                .driver_data = MODEL_PCI_LOGITEC,
        },
        {
                .vendor      = PCI_VENDOR_ID_WORKBIT,
                .device      = PCI_DEVICE_ID_NINJASCSI_32UDE_MELCO,
                .subvendor   = PCI_ANY_ID,
                .subdevice   = PCI_ANY_ID,
                .driver_data = MODEL_PCI_MELCO,
        },
        {
                .vendor      = PCI_VENDOR_ID_WORKBIT,
                .device      = PCI_DEVICE_ID_NINJASCSI_32UDE_MELCO_II,
                .subvendor   = PCI_ANY_ID,
                .subdevice   = PCI_ANY_ID,
                .driver_data = MODEL_PCI_MELCO,
        },
        {0,0,},
};
MODULE_DEVICE_TABLE(pci, nsp32_pci_table);

static nsp32_hw_data nsp32_data_base;  /* probe <-> detect glue */


/*
 * Period/AckWidth speed conversion table
 *
 * Note: This period/ackwidth speed table must be in descending order.
 */
static nsp32_sync_table nsp32_sync_table_40M[] = {
     /* {PNo, AW,   SP,   EP, SREQ smpl}  Speed(MB/s) Period AckWidth */
        {0x1,  0, 0x0c, 0x0c, SMPL_40M},  /*  20.0 :  50ns,  25ns */
        {0x2,  0, 0x0d, 0x18, SMPL_40M},  /*  13.3 :  75ns,  25ns */
        {0x3,  1, 0x19, 0x19, SMPL_40M},  /*  10.0 : 100ns,  50ns */
        {0x4,  1, 0x1a, 0x1f, SMPL_20M},  /*   8.0 : 125ns,  50ns */
        {0x5,  2, 0x20, 0x25, SMPL_20M},  /*   6.7 : 150ns,  75ns */
        {0x6,  2, 0x26, 0x31, SMPL_20M},  /*   5.7 : 175ns,  75ns */
        {0x7,  3, 0x32, 0x32, SMPL_20M},  /*   5.0 : 200ns, 100ns */
        {0x8,  3, 0x33, 0x38, SMPL_10M},  /*   4.4 : 225ns, 100ns */
        {0x9,  3, 0x39, 0x3e, SMPL_10M},  /*   4.0 : 250ns, 100ns */
};

static nsp32_sync_table nsp32_sync_table_20M[] = {
        {0x1,  0, 0x19, 0x19, SMPL_40M},  /* 10.0 : 100ns,  50ns */
        {0x2,  0, 0x1a, 0x25, SMPL_20M},  /*  6.7 : 150ns,  50ns */
        {0x3,  1, 0x26, 0x32, SMPL_20M},  /*  5.0 : 200ns, 100ns */
        {0x4,  1, 0x33, 0x3e, SMPL_10M},  /*  4.0 : 250ns, 100ns */
        {0x5,  2, 0x3f, 0x4b, SMPL_10M},  /*  3.3 : 300ns, 150ns */
        {0x6,  2, 0x4c, 0x57, SMPL_10M},  /*  2.8 : 350ns, 150ns */
        {0x7,  3, 0x58, 0x64, SMPL_10M},  /*  2.5 : 400ns, 200ns */
        {0x8,  3, 0x65, 0x70, SMPL_10M},  /*  2.2 : 450ns, 200ns */
        {0x9,  3, 0x71, 0x7d, SMPL_10M},  /*  2.0 : 500ns, 200ns */
};

static nsp32_sync_table nsp32_sync_table_pci[] = {
        {0x1,  0, 0x0c, 0x0f, SMPL_40M},  /* 16.6 :  60ns,  30ns */
        {0x2,  0, 0x10, 0x16, SMPL_40M},  /* 11.1 :  90ns,  30ns */
        {0x3,  1, 0x17, 0x1e, SMPL_20M},  /*  8.3 : 120ns,  60ns */
        {0x4,  1, 0x1f, 0x25, SMPL_20M},  /*  6.7 : 150ns,  60ns */
        {0x5,  2, 0x26, 0x2d, SMPL_20M},  /*  5.6 : 180ns,  90ns */
        {0x6,  2, 0x2e, 0x34, SMPL_10M},  /*  4.8 : 210ns,  90ns */
        {0x7,  3, 0x35, 0x3c, SMPL_10M},  /*  4.2 : 240ns, 120ns */
        {0x8,  3, 0x3d, 0x43, SMPL_10M},  /*  3.7 : 270ns, 120ns */
        {0x9,  3, 0x44, 0x4b, SMPL_10M},  /*  3.3 : 300ns, 120ns */
};

/*
 * function declaration
 */
/* module entry point */
static int         nsp32_probe (struct pci_dev *, const struct pci_device_id *);
static void        nsp32_remove(struct pci_dev *);
static int  __init init_nsp32  (void);
static void __exit exit_nsp32  (void);

/* struct struct scsi_host_template */
static int         nsp32_show_info   (struct seq_file *, struct Scsi_Host *);

static int         nsp32_detect      (struct pci_dev *pdev);
static int         nsp32_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
static const char *nsp32_info        (struct Scsi_Host *);
static int         nsp32_release     (struct Scsi_Host *);

/* SCSI error handler */
static int         nsp32_eh_abort     (struct scsi_cmnd *);
static int         nsp32_eh_host_reset(struct scsi_cmnd *);

/* generate SCSI message */
static void nsp32_build_identify(struct scsi_cmnd *);
static void nsp32_build_nop     (struct scsi_cmnd *);
static void nsp32_build_reject  (struct scsi_cmnd *);
static void nsp32_build_sdtr    (struct scsi_cmnd *, unsigned char, unsigned char);

/* SCSI message handler */
static int  nsp32_busfree_occur(struct scsi_cmnd *, unsigned short);
static void nsp32_msgout_occur (struct scsi_cmnd *);
static void nsp32_msgin_occur  (struct scsi_cmnd *, unsigned long, unsigned short);

static int  nsp32_setup_sg_table    (struct scsi_cmnd *);
static int  nsp32_selection_autopara(struct scsi_cmnd *);
static int  nsp32_selection_autoscsi(struct scsi_cmnd *);
static void nsp32_scsi_done         (struct scsi_cmnd *);
static int  nsp32_arbitration       (struct scsi_cmnd *, unsigned int);
static int  nsp32_reselection       (struct scsi_cmnd *, unsigned char);
static void nsp32_adjust_busfree    (struct scsi_cmnd *, unsigned int);
static void nsp32_restart_autoscsi  (struct scsi_cmnd *, unsigned short);

/* SCSI SDTR */
static void nsp32_analyze_sdtr       (struct scsi_cmnd *);
static int  nsp32_search_period_entry(nsp32_hw_data *, nsp32_target *, unsigned char);
static void nsp32_set_async          (nsp32_hw_data *, nsp32_target *);
static void nsp32_set_max_sync       (nsp32_hw_data *, nsp32_target *, unsigned char *, unsigned char *);
static void nsp32_set_sync_entry     (nsp32_hw_data *, nsp32_target *, int, unsigned char);

/* SCSI bus status handler */
static void nsp32_wait_req    (nsp32_hw_data *, int);
static void nsp32_wait_sack   (nsp32_hw_data *, int);
static void nsp32_sack_assert (nsp32_hw_data *);
static void nsp32_sack_negate (nsp32_hw_data *);
static void nsp32_do_bus_reset(nsp32_hw_data *);

/* hardware interrupt handler */
static irqreturn_t do_nsp32_isr(int, void *);

/* initialize hardware */
static int  nsp32hw_init(nsp32_hw_data *);

/* EEPROM handler */
static        int  nsp32_getprom_param (nsp32_hw_data *);
static        int  nsp32_getprom_at24  (nsp32_hw_data *);
static        int  nsp32_getprom_c16   (nsp32_hw_data *);
static        void nsp32_prom_start    (nsp32_hw_data *);
static        void nsp32_prom_stop     (nsp32_hw_data *);
static        int  nsp32_prom_read     (nsp32_hw_data *, int);
static        int  nsp32_prom_read_bit (nsp32_hw_data *);
static        void nsp32_prom_write_bit(nsp32_hw_data *, int);
static        void nsp32_prom_set      (nsp32_hw_data *, int, int);
static        int  nsp32_prom_get      (nsp32_hw_data *, int);

/* debug/warning/info message */
static void nsp32_message (const char *, int, char *, char *, ...);
#ifdef NSP32_DEBUG
static void nsp32_dmessage(const char *, int, int,    char *, ...);
#endif

/*
 * max_sectors is currently limited up to 128.
 */
static struct scsi_host_template nsp32_template = {
        .proc_name                      = "nsp32",
        .name                           = "Workbit NinjaSCSI-32Bi/UDE",
        .show_info                      = nsp32_show_info,
        .info                           = nsp32_info,
        .queuecommand                   = nsp32_queuecommand,
        .can_queue                      = 1,
        .sg_tablesize                   = NSP32_SG_SIZE,
        .max_sectors                    = 128,
        .this_id                        = NSP32_HOST_SCSIID,
        .dma_boundary                   = PAGE_SIZE - 1,
        .eh_abort_handler               = nsp32_eh_abort,
        .eh_host_reset_handler          = nsp32_eh_host_reset,
/*      .highmem_io                     = 1, */
};

#include "nsp32_io.h"

/***********************************************************************
 * debug, error print
 */
#ifndef NSP32_DEBUG
# define NSP32_DEBUG_MASK             0x000000
# define nsp32_msg(type, args...)     nsp32_message ("", 0, (type), args)
# define nsp32_dbg(mask, args...)     /* */
#else
# define NSP32_DEBUG_MASK             0xffffff
# define nsp32_msg(type, args...) \
        nsp32_message (__func__, __LINE__, (type), args)
# define nsp32_dbg(mask, args...) \
        nsp32_dmessage(__func__, __LINE__, (mask), args)
#endif

#define NSP32_DEBUG_QUEUECOMMAND        BIT(0)
#define NSP32_DEBUG_REGISTER            BIT(1)
#define NSP32_DEBUG_AUTOSCSI            BIT(2)
#define NSP32_DEBUG_INTR                BIT(3)
#define NSP32_DEBUG_SGLIST              BIT(4)
#define NSP32_DEBUG_BUSFREE             BIT(5)
#define NSP32_DEBUG_CDB_CONTENTS        BIT(6)
#define NSP32_DEBUG_RESELECTION         BIT(7)
#define NSP32_DEBUG_MSGINOCCUR          BIT(8)
#define NSP32_DEBUG_EEPROM              BIT(9)
#define NSP32_DEBUG_MSGOUTOCCUR         BIT(10)
#define NSP32_DEBUG_BUSRESET            BIT(11)
#define NSP32_DEBUG_RESTART             BIT(12)
#define NSP32_DEBUG_SYNC                BIT(13)
#define NSP32_DEBUG_WAIT                BIT(14)
#define NSP32_DEBUG_TARGETFLAG          BIT(15)
#define NSP32_DEBUG_PROC                BIT(16)
#define NSP32_DEBUG_INIT                BIT(17)
#define NSP32_SPECIAL_PRINT_REGISTER    BIT(20)

#define NSP32_DEBUG_BUF_LEN             100

static void nsp32_message(const char *func, int line, char *type, char *fmt, ...)
{
        va_list args;
        char buf[NSP32_DEBUG_BUF_LEN];

        va_start(args, fmt);
        vsnprintf(buf, sizeof(buf), fmt, args);
        va_end(args);

#ifndef NSP32_DEBUG
        printk("%snsp32: %s\n", type, buf);
#else
        printk("%snsp32: %s (%d): %s\n", type, func, line, buf);
#endif
}

#ifdef NSP32_DEBUG
static void nsp32_dmessage(const char *func, int line, int mask, char *fmt, ...)
{
        va_list args;
        char buf[NSP32_DEBUG_BUF_LEN];

        va_start(args, fmt);
        vsnprintf(buf, sizeof(buf), fmt, args);
        va_end(args);

        if (mask & NSP32_DEBUG_MASK) {
                printk("nsp32-debug: 0x%x %s (%d): %s\n", mask, func, line, buf);
        }
}
#endif

#ifdef NSP32_DEBUG
# include "nsp32_debug.c"
#else
# define show_command(arg)   /* */
# define show_busphase(arg)  /* */
# define show_autophase(arg) /* */
#endif

/*
 * IDENTIFY Message
 */
static void nsp32_build_identify(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        int pos             = data->msgout_len;
        int mode            = FALSE;

        /* XXX: Auto DiscPriv detection is progressing... */
        if (disc_priv == 0) {
                /* mode = TRUE; */
        }

        data->msgoutbuf[pos] = IDENTIFY(mode, SCpnt->device->lun); pos++;

        data->msgout_len = pos;
}

/*
 * SDTR Message Routine
 */
static void nsp32_build_sdtr(struct scsi_cmnd    *SCpnt,
                             unsigned char period,
                             unsigned char offset)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        int pos             = data->msgout_len;

        data->msgoutbuf[pos] = EXTENDED_MESSAGE;  pos++;
        data->msgoutbuf[pos] = EXTENDED_SDTR_LEN; pos++;
        data->msgoutbuf[pos] = EXTENDED_SDTR;     pos++;
        data->msgoutbuf[pos] = period;            pos++;
        data->msgoutbuf[pos] = offset;            pos++;

        data->msgout_len = pos;
}

/*
 * No Operation Message
 */
static void nsp32_build_nop(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        int            pos  = data->msgout_len;

        if (pos != 0) {
                nsp32_msg(KERN_WARNING,
                          "Some messages are already contained!");
                return;
        }

        data->msgoutbuf[pos] = NOP; pos++;
        data->msgout_len = pos;
}

/*
 * Reject Message
 */
static void nsp32_build_reject(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        int            pos  = data->msgout_len;

        data->msgoutbuf[pos] = MESSAGE_REJECT; pos++;
        data->msgout_len = pos;
}
        
/*
 * timer
 */
#if 0
static void nsp32_start_timer(struct scsi_cmnd *SCpnt, int time)
{
        unsigned int base = SCpnt->host->io_port;

        nsp32_dbg(NSP32_DEBUG_INTR, "timer=%d", time);

        if (time & (~TIMER_CNT_MASK)) {
                nsp32_dbg(NSP32_DEBUG_INTR, "timer set overflow");
        }

        nsp32_write2(base, TIMER_SET, time & TIMER_CNT_MASK);
}
#endif


/*
 * set SCSI command and other parameter to asic, and start selection phase
 */
static int nsp32_selection_autopara(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data  *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        unsigned int    base    = SCpnt->device->host->io_port;
        unsigned int    host_id = SCpnt->device->host->this_id;
        unsigned char   target  = scmd_id(SCpnt);
        nsp32_autoparam *param  = data->autoparam;
        unsigned char   phase;
        int             i, ret;
        unsigned int    msgout;
        u16_le          s;

        nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "in");

        /*
         * check bus free
         */
        phase = nsp32_read1(base, SCSI_BUS_MONITOR);
        if (phase != BUSMON_BUS_FREE) {
                nsp32_msg(KERN_WARNING, "bus busy");
                show_busphase(phase & BUSMON_PHASE_MASK);
                SCpnt->result = DID_BUS_BUSY << 16;
                return FALSE;
        }

        /*
         * message out
         *
         * Note: If the range of msgout_len is 1 - 3, fill scsi_msgout.
         *       over 3 messages needs another routine.
         */
        if (data->msgout_len == 0) {
                nsp32_msg(KERN_ERR, "SCSI MsgOut without any message!");
                SCpnt->result = DID_ERROR << 16;
                return FALSE;
        } else if (data->msgout_len > 0 && data->msgout_len <= 3) {
                msgout = 0;
                for (i = 0; i < data->msgout_len; i++) {
                        /*
                         * the sending order of the message is:
                         *  MCNT 3: MSG#0 -> MSG#1 -> MSG#2
                         *  MCNT 2:          MSG#1 -> MSG#2
                         *  MCNT 1:                   MSG#2    
                         */
                        msgout >>= 8;
                        msgout |= ((unsigned int)(data->msgoutbuf[i]) << 24);
                }
                msgout |= MV_VALID;     /* MV valid */
                msgout |= (unsigned int)data->msgout_len; /* len */
        } else {
                /* data->msgout_len > 3 */
                msgout = 0;
        }

        // nsp_dbg(NSP32_DEBUG_AUTOSCSI, "sel time out=0x%x\n", nsp32_read2(base, SEL_TIME_OUT));
        // nsp32_write2(base, SEL_TIME_OUT,   SEL_TIMEOUT_TIME);

        /*
         * setup asic parameter
         */
        memset(param, 0, sizeof(nsp32_autoparam));

        /* cdb */
        for (i = 0; i < SCpnt->cmd_len; i++) {
                param->cdb[4 * i] = SCpnt->cmnd[i];
        }

        /* outgoing messages */
        param->msgout = cpu_to_le32(msgout);

        /* syncreg, ackwidth, target id, SREQ sampling rate */
        param->syncreg    = data->cur_target->syncreg;
        param->ackwidth   = data->cur_target->ackwidth;
        param->target_id  = BIT(host_id) | BIT(target);
        param->sample_reg = data->cur_target->sample_reg;

        // nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "sample rate=0x%x\n", data->cur_target->sample_reg);

        /* command control */
        param->command_control = cpu_to_le16(CLEAR_CDB_FIFO_POINTER |
                                             AUTOSCSI_START         |
                                             AUTO_MSGIN_00_OR_04    |
                                             AUTO_MSGIN_02          |
                                             AUTO_ATN               );


        /* transfer control */
        s = 0;
        switch (data->trans_method) {
        case NSP32_TRANSFER_BUSMASTER:
                s |= BM_START;
                break;
        case NSP32_TRANSFER_MMIO:
                s |= CB_MMIO_MODE;
                break;
        case NSP32_TRANSFER_PIO:
                s |= CB_IO_MODE;
                break;
        default:
                nsp32_msg(KERN_ERR, "unknown trans_method");
                break;
        }
        /*
         * OR-ed BLIEND_MODE, FIFO intr is decreased, instead of PCI bus waits.
         * For bus master transfer, it's taken off.
         */
        s |= (TRANSFER_GO | ALL_COUNTER_CLR);
        param->transfer_control = cpu_to_le16(s);

        /* sg table addr */
        param->sgt_pointer = cpu_to_le32(data->cur_lunt->sglun_paddr);

        /*
         * transfer parameter to ASIC
         */
        nsp32_write4(base, SGT_ADR,         data->auto_paddr);
        nsp32_write2(base, COMMAND_CONTROL, CLEAR_CDB_FIFO_POINTER |
                                            AUTO_PARAMETER         );

        /*
         * Check arbitration
         */
        ret = nsp32_arbitration(SCpnt, base);

        return ret;
}


/*
 * Selection with AUTO SCSI (without AUTO PARAMETER)
 */
static int nsp32_selection_autoscsi(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data  *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        unsigned int    base    = SCpnt->device->host->io_port;
        unsigned int    host_id = SCpnt->device->host->this_id;
        unsigned char   target  = scmd_id(SCpnt);
        unsigned char   phase;
        int             status;
        unsigned short  command = 0;
        unsigned int    msgout  = 0;
        unsigned short  execph;
        int             i;

        nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "in");

        /*
         * IRQ disable
         */
        nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK);

        /*
         * check bus line
         */
        phase = nsp32_read1(base, SCSI_BUS_MONITOR);
        if ((phase & BUSMON_BSY) || (phase & BUSMON_SEL)) {
                nsp32_msg(KERN_WARNING, "bus busy");
                SCpnt->result = DID_BUS_BUSY << 16;
                status = 1;
                goto out;
        }

        /*
         * clear execph
         */
        execph = nsp32_read2(base, SCSI_EXECUTE_PHASE);

        /*
         * clear FIFO counter to set CDBs
         */
        nsp32_write2(base, COMMAND_CONTROL, CLEAR_CDB_FIFO_POINTER);

        /*
         * set CDB0 - CDB15
         */
        for (i = 0; i < SCpnt->cmd_len; i++) {
                nsp32_write1(base, COMMAND_DATA, SCpnt->cmnd[i]);
        }
        nsp32_dbg(NSP32_DEBUG_CDB_CONTENTS, "CDB[0]=[0x%x]", SCpnt->cmnd[0]);

        /*
         * set SCSIOUT LATCH(initiator)/TARGET(target) (OR-ed) ID
         */
        nsp32_write1(base, SCSI_OUT_LATCH_TARGET_ID, BIT(host_id) | BIT(target));

        /*
         * set SCSI MSGOUT REG
         *
         * Note: If the range of msgout_len is 1 - 3, fill scsi_msgout.
         *       over 3 messages needs another routine.
         */
        if (data->msgout_len == 0) {
                nsp32_msg(KERN_ERR, "SCSI MsgOut without any message!");
                SCpnt->result = DID_ERROR << 16;
                status = 1;
                goto out;
        } else if (data->msgout_len > 0 && data->msgout_len <= 3) {
                msgout = 0;
                for (i = 0; i < data->msgout_len; i++) {
                        /*
                         * the sending order of the message is:
                         *  MCNT 3: MSG#0 -> MSG#1 -> MSG#2
                         *  MCNT 2:          MSG#1 -> MSG#2
                         *  MCNT 1:                   MSG#2    
                         */
                        msgout >>= 8;
                        msgout |= ((unsigned int)(data->msgoutbuf[i]) << 24);
                }
                msgout |= MV_VALID;     /* MV valid */
                msgout |= (unsigned int)data->msgout_len; /* len */
                nsp32_write4(base, SCSI_MSG_OUT, msgout);
        } else {
                /* data->msgout_len > 3 */
                nsp32_write4(base, SCSI_MSG_OUT, 0);
        }

        /*
         * set selection timeout(= 250ms)
         */
        nsp32_write2(base, SEL_TIME_OUT,   SEL_TIMEOUT_TIME);

        /*
         * set SREQ hazard killer sampling rate
         * 
         * TODO: sample_rate (BASE+0F) is 0 when internal clock = 40MHz.
         *      check other internal clock!
         */
        nsp32_write1(base, SREQ_SMPL_RATE, data->cur_target->sample_reg);

        /*
         * clear Arbit
         */
        nsp32_write1(base, SET_ARBIT,      ARBIT_CLEAR);

        /*
         * set SYNCREG
         * Don't set BM_START_ADR before setting this register.
         */
        nsp32_write1(base, SYNC_REG,  data->cur_target->syncreg);

        /*
         * set ACKWIDTH
         */
        nsp32_write1(base, ACK_WIDTH, data->cur_target->ackwidth);

        nsp32_dbg(NSP32_DEBUG_AUTOSCSI,
                  "syncreg=0x%x, ackwidth=0x%x, sgtpaddr=0x%x, id=0x%x",
                  nsp32_read1(base, SYNC_REG), nsp32_read1(base, ACK_WIDTH),
                  nsp32_read4(base, SGT_ADR), nsp32_read1(base, SCSI_OUT_LATCH_TARGET_ID));
        nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "msgout_len=%d, msgout=0x%x",
                  data->msgout_len, msgout);

        /*
         * set SGT ADDR (physical address)
         */
        nsp32_write4(base, SGT_ADR, data->cur_lunt->sglun_paddr);

        /*
         * set TRANSFER CONTROL REG
         */
        command = 0;
        command |= (TRANSFER_GO | ALL_COUNTER_CLR);
        if (data->trans_method & NSP32_TRANSFER_BUSMASTER) {
                if (scsi_bufflen(SCpnt) > 0) {
                        command |= BM_START;
                }
        } else if (data->trans_method & NSP32_TRANSFER_MMIO) {
                command |= CB_MMIO_MODE;
        } else if (data->trans_method & NSP32_TRANSFER_PIO) {
                command |= CB_IO_MODE;
        }
        nsp32_write2(base, TRANSFER_CONTROL, command);

        /*
         * start AUTO SCSI, kick off arbitration
         */
        command = (CLEAR_CDB_FIFO_POINTER |
                   AUTOSCSI_START         |
                   AUTO_MSGIN_00_OR_04    |
                   AUTO_MSGIN_02          |
                   AUTO_ATN                );
        nsp32_write2(base, COMMAND_CONTROL, command);

        /*
         * Check arbitration
         */
        status = nsp32_arbitration(SCpnt, base);

 out:
        /*
         * IRQ enable
         */
        nsp32_write2(base, IRQ_CONTROL, 0);

        return status;
}


/*
 * Arbitration Status Check
 *      
 * Note: Arbitration counter is waited during ARBIT_GO is not lifting.
 *       Using udelay(1) consumes CPU time and system time, but 
 *       arbitration delay time is defined minimal 2.4us in SCSI
 *       specification, thus udelay works as coarse grained wait timer.
 */
static int nsp32_arbitration(struct scsi_cmnd *SCpnt, unsigned int base)
{
        unsigned char arbit;
        int           status = TRUE;
        int           time   = 0;

        do {
                arbit = nsp32_read1(base, ARBIT_STATUS);
                time++;
        } while ((arbit & (ARBIT_WIN | ARBIT_FAIL)) == 0 &&
                 (time <= ARBIT_TIMEOUT_TIME));

        nsp32_dbg(NSP32_DEBUG_AUTOSCSI,
                  "arbit: 0x%x, delay time: %d", arbit, time);

        if (arbit & ARBIT_WIN) {
                /* Arbitration succeeded */
                SCpnt->result = DID_OK << 16;
                nsp32_index_write1(base, EXT_PORT, LED_ON); /* PCI LED on */
        } else if (arbit & ARBIT_FAIL) {
                /* Arbitration failed */
                SCpnt->result = DID_BUS_BUSY << 16;
                status = FALSE;
        } else {
                /*
                 * unknown error or ARBIT_GO timeout,
                 * something lock up! guess no connection.
                 */
                nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "arbit timeout");
                SCpnt->result = DID_NO_CONNECT << 16;
                status = FALSE;
        }

        /*
         * clear Arbit
         */
        nsp32_write1(base, SET_ARBIT, ARBIT_CLEAR);

        return status;
}


/*
 * reselection
 *
 * Note: This reselection routine is called from msgin_occur,
 *       reselection target id&lun must be already set.
 *       SCSI-2 says IDENTIFY implies RESTORE_POINTER operation.
 */
static int nsp32_reselection(struct scsi_cmnd *SCpnt, unsigned char newlun)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        unsigned int   host_id = SCpnt->device->host->this_id;
        unsigned int   base    = SCpnt->device->host->io_port;
        unsigned char  tmpid, newid;

        nsp32_dbg(NSP32_DEBUG_RESELECTION, "enter");

        /*
         * calculate reselected SCSI ID
         */
        tmpid = nsp32_read1(base, RESELECT_ID);
        tmpid &= (~BIT(host_id));
        newid = 0;
        while (tmpid) {
                if (tmpid & 1) {
                        break;
                }
                tmpid >>= 1;
                newid++;
        }

        /*
         * If reselected New ID:LUN is not existed
         * or current nexus is not existed, unexpected
         * reselection is occurred. Send reject message.
         */
        if (newid >= ARRAY_SIZE(data->lunt) || newlun >= ARRAY_SIZE(data->lunt[0])) {
                nsp32_msg(KERN_WARNING, "unknown id/lun");
                return FALSE;
        } else if(data->lunt[newid][newlun].SCpnt == NULL) {
                nsp32_msg(KERN_WARNING, "no SCSI command is processing");
                return FALSE;
        }

        data->cur_id    = newid;
        data->cur_lun   = newlun;
        data->cur_target = &(data->target[newid]);
        data->cur_lunt   = &(data->lunt[newid][newlun]);

        /* reset SACK/SavedACK counter (or ALL clear?) */
        nsp32_write4(base, CLR_COUNTER, CLRCOUNTER_ALLMASK);

        return TRUE;
}


/*
 * nsp32_setup_sg_table - build scatter gather list for transfer data
 *                          with bus master.
 *
 * Note: NinjaSCSI-32Bi/UDE bus master can not transfer over 64KB at a time.
 */
static int nsp32_setup_sg_table(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        struct scatterlist *sg;
        nsp32_sgtable *sgt = data->cur_lunt->sglun->sgt;
        int num, i;
        u32_le l;

        if (sgt == NULL) {
                nsp32_dbg(NSP32_DEBUG_SGLIST, "SGT == null");
                return FALSE;
        }

        num = scsi_dma_map(SCpnt);
        if (!num)
                return TRUE;
        else if (num < 0)
                return FALSE;
        else {
                scsi_for_each_sg(SCpnt, sg, num, i) {
                        /*
                         * Build nsp32_sglist, substitute sg dma addresses.
                         */
                        sgt[i].addr = cpu_to_le32(sg_dma_address(sg));
                        sgt[i].len  = cpu_to_le32(sg_dma_len(sg));

                        if (le32_to_cpu(sgt[i].len) > 0x10000) {
                                nsp32_msg(KERN_ERR,
                                        "can't transfer over 64KB at a time, size=0x%lx", le32_to_cpu(sgt[i].len));
                                return FALSE;
                        }
                        nsp32_dbg(NSP32_DEBUG_SGLIST,
                                  "num 0x%x : addr 0x%lx len 0x%lx",
                                  i,
                                  le32_to_cpu(sgt[i].addr),
                                  le32_to_cpu(sgt[i].len ));
                }

                /* set end mark */
                l = le32_to_cpu(sgt[num-1].len);
                sgt[num-1].len = cpu_to_le32(l | SGTEND);
        }

        return TRUE;
}

static int nsp32_queuecommand_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *))
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        nsp32_target *target;
        nsp32_lunt   *cur_lunt;
        int ret;

        nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND,
                  "enter. target: 0x%x LUN: 0x%llx cmnd: 0x%x cmndlen: 0x%x "
                  "use_sg: 0x%x reqbuf: 0x%lx reqlen: 0x%x",
                  SCpnt->device->id, SCpnt->device->lun, SCpnt->cmnd[0], SCpnt->cmd_len,
                  scsi_sg_count(SCpnt), scsi_sglist(SCpnt), scsi_bufflen(SCpnt));

        if (data->CurrentSC != NULL) {
                nsp32_msg(KERN_ERR, "Currentsc != NULL. Cancel this command request");
                data->CurrentSC = NULL;
                SCpnt->result   = DID_NO_CONNECT << 16;
                done(SCpnt);
                return 0;
        }

        /* check target ID is not same as this initiator ID */
        if (scmd_id(SCpnt) == SCpnt->device->host->this_id) {
                nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, "target==host???");
                SCpnt->result = DID_BAD_TARGET << 16;
                done(SCpnt);
                return 0;
        }

        /* check target LUN is allowable value */
        if (SCpnt->device->lun >= MAX_LUN) {
                nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, "no more lun");
                SCpnt->result = DID_BAD_TARGET << 16;
                done(SCpnt);
                return 0;
        }

        show_command(SCpnt);

        SCpnt->scsi_done     = done;
        data->CurrentSC      = SCpnt;
        SCpnt->SCp.Status    = CHECK_CONDITION;
        SCpnt->SCp.Message   = 0;
        scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));

        SCpnt->SCp.ptr              = (char *)scsi_sglist(SCpnt);
        SCpnt->SCp.this_residual    = scsi_bufflen(SCpnt);
        SCpnt->SCp.buffer           = NULL;
        SCpnt->SCp.buffers_residual = 0;

        /* initialize data */
        data->msgout_len        = 0;
        data->msgin_len         = 0;
        cur_lunt                = &(data->lunt[SCpnt->device->id][SCpnt->device->lun]);
        cur_lunt->SCpnt         = SCpnt;
        cur_lunt->save_datp     = 0;
        cur_lunt->msgin03       = FALSE;
        data->cur_lunt          = cur_lunt;
        data->cur_id            = SCpnt->device->id;
        data->cur_lun           = SCpnt->device->lun;

        ret = nsp32_setup_sg_table(SCpnt);
        if (ret == FALSE) {
                nsp32_msg(KERN_ERR, "SGT fail");
                SCpnt->result = DID_ERROR << 16;
                nsp32_scsi_done(SCpnt);
                return 0;
        }

        /* Build IDENTIFY */
        nsp32_build_identify(SCpnt);

        /* 
         * If target is the first time to transfer after the reset
         * (target don't have SDTR_DONE and SDTR_INITIATOR), sync
         * message SDTR is needed to do synchronous transfer.
         */
        target = &data->target[scmd_id(SCpnt)];
        data->cur_target = target;

        if (!(target->sync_flag & (SDTR_DONE | SDTR_INITIATOR | SDTR_TARGET))) {
                unsigned char period, offset;

                if (trans_mode != ASYNC_MODE) {
                        nsp32_set_max_sync(data, target, &period, &offset);
                        nsp32_build_sdtr(SCpnt, period, offset);
                        target->sync_flag |= SDTR_INITIATOR;
                } else {
                        nsp32_set_async(data, target);
                        target->sync_flag |= SDTR_DONE;
                }

                nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND,
                          "SDTR: entry: %d start_period: 0x%x offset: 0x%x\n",

                          target->limit_entry, period, offset);
        } else if (target->sync_flag & SDTR_INITIATOR) {
                /*
                 * It was negotiating SDTR with target, sending from the
                 * initiator, but there are no chance to remove this flag.
                 * Set async because we don't get proper negotiation.
                 */
                nsp32_set_async(data, target);
                target->sync_flag &= ~SDTR_INITIATOR;
                target->sync_flag |= SDTR_DONE;

                nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND,
                          "SDTR_INITIATOR: fall back to async");
        } else if (target->sync_flag & SDTR_TARGET) {
                /*
                 * It was negotiating SDTR with target, sending from target,
                 * but there are no chance to remove this flag.  Set async
                 * because we don't get proper negotiation.
                 */
                nsp32_set_async(data, target);
                target->sync_flag &= ~SDTR_TARGET;
                target->sync_flag |= SDTR_DONE;

                nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND,
                          "Unknown SDTR from target is reached, fall back to async.");
        }

        nsp32_dbg(NSP32_DEBUG_TARGETFLAG,
                  "target: %d sync_flag: 0x%x syncreg: 0x%x ackwidth: 0x%x",
                  SCpnt->device->id, target->sync_flag, target->syncreg,
                  target->ackwidth);

        /* Selection */
        if (auto_param == 0) {
                ret = nsp32_selection_autopara(SCpnt);
        } else {
                ret = nsp32_selection_autoscsi(SCpnt);
        }

        if (ret != TRUE) {
                nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, "selection fail");
                nsp32_scsi_done(SCpnt);
        }

        return 0;
}

static DEF_SCSI_QCMD(nsp32_queuecommand)

/* initialize asic */
static int nsp32hw_init(nsp32_hw_data *data)
{
        unsigned int   base = data->BaseAddress;
        unsigned short irq_stat;
        unsigned long  lc_reg;
        unsigned char  power;

        lc_reg = nsp32_index_read4(base, CFG_LATE_CACHE);
        if ((lc_reg & 0xff00) == 0) {
                lc_reg |= (0x20 << 8);
                nsp32_index_write2(base, CFG_LATE_CACHE, lc_reg & 0xffff);
        }

        nsp32_write2(base, IRQ_CONTROL,        IRQ_CONTROL_ALL_IRQ_MASK);
        nsp32_write2(base, TRANSFER_CONTROL,   0);
        nsp32_write4(base, BM_CNT,             0);
        nsp32_write2(base, SCSI_EXECUTE_PHASE, 0);

        do {
                irq_stat = nsp32_read2(base, IRQ_STATUS);
                nsp32_dbg(NSP32_DEBUG_INIT, "irq_stat 0x%x", irq_stat);
        } while (irq_stat & IRQSTATUS_ANY_IRQ);

        /*
         * Fill FIFO_FULL_SHLD, FIFO_EMPTY_SHLD. Below parameter is
         *  designated by specification.
         */
        if ((data->trans_method & NSP32_TRANSFER_PIO) ||
            (data->trans_method & NSP32_TRANSFER_MMIO)) {
                nsp32_index_write1(base, FIFO_FULL_SHLD_COUNT,  0x40);
                nsp32_index_write1(base, FIFO_EMPTY_SHLD_COUNT, 0x40);
        } else if (data->trans_method & NSP32_TRANSFER_BUSMASTER) {
                nsp32_index_write1(base, FIFO_FULL_SHLD_COUNT,  0x10);
                nsp32_index_write1(base, FIFO_EMPTY_SHLD_COUNT, 0x60);
        } else {
                nsp32_dbg(NSP32_DEBUG_INIT, "unknown transfer mode");
        }

        nsp32_dbg(NSP32_DEBUG_INIT, "full 0x%x emp 0x%x",
                  nsp32_index_read1(base, FIFO_FULL_SHLD_COUNT),
                  nsp32_index_read1(base, FIFO_EMPTY_SHLD_COUNT));

        nsp32_index_write1(base, CLOCK_DIV, data->clock);
        nsp32_index_write1(base, BM_CYCLE,  MEMRD_CMD1 | SGT_AUTO_PARA_MEMED_CMD);
        nsp32_write1(base, PARITY_CONTROL, 0);  /* parity check is disable */

        /*
         * initialize MISC_WRRD register
         * 
         * Note: Designated parameters is obeyed as following:
         *      MISC_SCSI_DIRECTION_DETECTOR_SELECT: It must be set.
         *      MISC_MASTER_TERMINATION_SELECT:      It must be set.
         *      MISC_BMREQ_NEGATE_TIMING_SEL:        It should be set.
         *      MISC_AUTOSEL_TIMING_SEL:             It should be set.
         *      MISC_BMSTOP_CHANGE2_NONDATA_PHASE:   It should be set.
         *      MISC_DELAYED_BMSTART:                It's selected for safety.
         *
         * Note: If MISC_BMSTOP_CHANGE2_NONDATA_PHASE is set, then
         *      we have to set TRANSFERCONTROL_BM_START as 0 and set
         *      appropriate value before restarting bus master transfer.
         */
        nsp32_index_write2(base, MISC_WR,
                           (SCSI_DIRECTION_DETECTOR_SELECT |
                            DELAYED_BMSTART                |
                            MASTER_TERMINATION_SELECT      |
                            BMREQ_NEGATE_TIMING_SEL        |
                            AUTOSEL_TIMING_SEL             |
                            BMSTOP_CHANGE2_NONDATA_PHASE));

        nsp32_index_write1(base, TERM_PWR_CONTROL, 0);
        power = nsp32_index_read1(base, TERM_PWR_CONTROL);
        if (!(power & SENSE)) {
                nsp32_msg(KERN_INFO, "term power on");
                nsp32_index_write1(base, TERM_PWR_CONTROL, BPWR);
        }

        nsp32_write2(base, TIMER_SET, TIMER_STOP);
        nsp32_write2(base, TIMER_SET, TIMER_STOP); /* Required 2 times */

        nsp32_write1(base, SYNC_REG,     0);
        nsp32_write1(base, ACK_WIDTH,    0);
        nsp32_write2(base, SEL_TIME_OUT, SEL_TIMEOUT_TIME);

        /*
         * enable to select designated IRQ (except for
         * IRQSELECT_SERR, IRQSELECT_PERR, IRQSELECT_BMCNTERR)
         */
        nsp32_index_write2(base, IRQ_SELECT, IRQSELECT_TIMER_IRQ         |
                                             IRQSELECT_SCSIRESET_IRQ     |
                                             IRQSELECT_FIFO_SHLD_IRQ     |
                                             IRQSELECT_RESELECT_IRQ      |
                                             IRQSELECT_PHASE_CHANGE_IRQ  |
                                             IRQSELECT_AUTO_SCSI_SEQ_IRQ |
                                          //   IRQSELECT_BMCNTERR_IRQ      |
                                             IRQSELECT_TARGET_ABORT_IRQ  |
                                             IRQSELECT_MASTER_ABORT_IRQ );
        nsp32_write2(base, IRQ_CONTROL, 0);

        /* PCI LED off */
        nsp32_index_write1(base, EXT_PORT_DDR, LED_OFF);
        nsp32_index_write1(base, EXT_PORT,     LED_OFF);

        return TRUE;
}


/* interrupt routine */
static irqreturn_t do_nsp32_isr(int irq, void *dev_id)
{
        nsp32_hw_data *data = dev_id;
        unsigned int base = data->BaseAddress;
        struct scsi_cmnd *SCpnt = data->CurrentSC;
        unsigned short auto_stat, irq_stat, trans_stat;
        unsigned char busmon, busphase;
        unsigned long flags;
        int ret;
        int handled = 0;
        struct Scsi_Host *host = data->Host;

        spin_lock_irqsave(host->host_lock, flags);

        /*
         * IRQ check, then enable IRQ mask
         */
        irq_stat = nsp32_read2(base, IRQ_STATUS);
        nsp32_dbg(NSP32_DEBUG_INTR, 
                  "enter IRQ: %d, IRQstatus: 0x%x", irq, irq_stat);
        /* is this interrupt comes from Ninja asic? */
        if ((irq_stat & IRQSTATUS_ANY_IRQ) == 0) {
                nsp32_dbg(NSP32_DEBUG_INTR, "shared interrupt: irq other 0x%x", irq_stat);
                goto out2;
        }
        handled = 1;
        nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK);

        busmon = nsp32_read1(base, SCSI_BUS_MONITOR);
        busphase = busmon & BUSMON_PHASE_MASK;

        trans_stat = nsp32_read2(base, TRANSFER_STATUS);
        if ((irq_stat == 0xffff) && (trans_stat == 0xffff)) {
                nsp32_msg(KERN_INFO, "card disconnect");
                if (data->CurrentSC != NULL) {
                        nsp32_msg(KERN_INFO, "clean up current SCSI command");
                        SCpnt->result = DID_BAD_TARGET << 16;
                        nsp32_scsi_done(SCpnt);
                }
                goto out;
        }

        /* Timer IRQ */
        if (irq_stat & IRQSTATUS_TIMER_IRQ) {
                nsp32_dbg(NSP32_DEBUG_INTR, "timer stop");
                nsp32_write2(base, TIMER_SET, TIMER_STOP);
                goto out;
        }

        /* SCSI reset */
        if (irq_stat & IRQSTATUS_SCSIRESET_IRQ) {
                nsp32_msg(KERN_INFO, "detected someone do bus reset");
                nsp32_do_bus_reset(data);
                if (SCpnt != NULL) {
                        SCpnt->result = DID_RESET << 16;
                        nsp32_scsi_done(SCpnt);
                }
                goto out;
        }

        if (SCpnt == NULL) {
                nsp32_msg(KERN_WARNING, "SCpnt==NULL this can't be happened");
                nsp32_msg(KERN_WARNING, "irq_stat=0x%x trans_stat=0x%x", irq_stat, trans_stat);
                goto out;
        }

        /*
         * AutoSCSI Interrupt.
         * Note: This interrupt is occurred when AutoSCSI is finished.  Then
         * check SCSIEXECUTEPHASE, and do appropriate action.  Each phases are
         * recorded when AutoSCSI sequencer has been processed.
         */
        if(irq_stat & IRQSTATUS_AUTOSCSI_IRQ) {
                /* getting SCSI executed phase */
                auto_stat = nsp32_read2(base, SCSI_EXECUTE_PHASE);
                nsp32_write2(base, SCSI_EXECUTE_PHASE, 0);

                /* Selection Timeout, go busfree phase. */
                if (auto_stat & SELECTION_TIMEOUT) {
                        nsp32_dbg(NSP32_DEBUG_INTR,
                                  "selection timeout occurred");

                        SCpnt->result = DID_TIME_OUT << 16;
                        nsp32_scsi_done(SCpnt);
                        goto out;
                }

                if (auto_stat & MSGOUT_PHASE) {
                        /*
                         * MsgOut phase was processed.
                         * If MSG_IN_OCCUER is not set, then MsgOut phase is
                         * completed. Thus, msgout_len must reset.  Otherwise,
                         * nothing to do here. If MSG_OUT_OCCUER is occurred,
                         * then we will encounter the condition and check.
                         */
                        if (!(auto_stat & MSG_IN_OCCUER) &&
                             (data->msgout_len <= 3)) {
                                /*
                                 * !MSG_IN_OCCUER && msgout_len <=3
                                 *   ---> AutoSCSI with MSGOUTreg is processed.
                                 */
                                data->msgout_len = 0;
                        };

                        nsp32_dbg(NSP32_DEBUG_INTR, "MsgOut phase processed");
                }

                if ((auto_stat & DATA_IN_PHASE) &&
                    (scsi_get_resid(SCpnt) > 0) &&
                    ((nsp32_read2(base, FIFO_REST_CNT) & FIFO_REST_MASK) != 0)) {
                        printk( "auto+fifo\n");
                        //nsp32_pio_read(SCpnt);
                }

                if (auto_stat & (DATA_IN_PHASE | DATA_OUT_PHASE)) {
                        /* DATA_IN_PHASE/DATA_OUT_PHASE was processed. */
                        nsp32_dbg(NSP32_DEBUG_INTR,
                                  "Data in/out phase processed");

                        /* read BMCNT, SGT pointer addr */
                        nsp32_dbg(NSP32_DEBUG_INTR, "BMCNT=0x%lx", 
                                    nsp32_read4(base, BM_CNT));
                        nsp32_dbg(NSP32_DEBUG_INTR, "addr=0x%lx", 
                                    nsp32_read4(base, SGT_ADR));
                        nsp32_dbg(NSP32_DEBUG_INTR, "SACK=0x%lx", 
                                    nsp32_read4(base, SACK_CNT));
                        nsp32_dbg(NSP32_DEBUG_INTR, "SSACK=0x%lx", 
                                    nsp32_read4(base, SAVED_SACK_CNT));

                        scsi_set_resid(SCpnt, 0); /* all data transferred! */
                }

                /*
                 * MsgIn Occur
                 */
                if (auto_stat & MSG_IN_OCCUER) {
                        nsp32_msgin_occur(SCpnt, irq_stat, auto_stat);
                }

                /*
                 * MsgOut Occur
                 */
                if (auto_stat & MSG_OUT_OCCUER) {
                        nsp32_msgout_occur(SCpnt);
                }

                /*
                 * Bus Free Occur
                 */
                if (auto_stat & BUS_FREE_OCCUER) {
                        ret = nsp32_busfree_occur(SCpnt, auto_stat);
                        if (ret == TRUE) {
                                goto out;
                        }
                }

                if (auto_stat & STATUS_PHASE) {
                        /*
                         * Read CSB and substitute CSB for SCpnt->result
                         * to save status phase stutas byte.
                         * scsi error handler checks host_byte (DID_*:
                         * low level driver to indicate status), then checks 
                         * status_byte (SCSI status byte).
                         */
                        SCpnt->result = (int)nsp32_read1(base, SCSI_CSB_IN);
                }

                if (auto_stat & ILLEGAL_PHASE) {
                        /* Illegal phase is detected. SACK is not back. */
                        nsp32_msg(KERN_WARNING, 
                                  "AUTO SCSI ILLEGAL PHASE OCCUR!!!!");

                        /* TODO: currently we don't have any action... bus reset? */

                        /*
                         * To send back SACK, assert, wait, and negate.
                         */
                        nsp32_sack_assert(data);
                        nsp32_wait_req(data, NEGATE);
                        nsp32_sack_negate(data);

                }

                if (auto_stat & COMMAND_PHASE) {
                        /* nothing to do */
                        nsp32_dbg(NSP32_DEBUG_INTR, "Command phase processed");
                }

                if (auto_stat & AUTOSCSI_BUSY) {
                        /* AutoSCSI is running */
                }

                show_autophase(auto_stat);
        }

        /* FIFO_SHLD_IRQ */
        if (irq_stat & IRQSTATUS_FIFO_SHLD_IRQ) {
                nsp32_dbg(NSP32_DEBUG_INTR, "FIFO IRQ");

                switch(busphase) {
                case BUSPHASE_DATA_OUT:
                        nsp32_dbg(NSP32_DEBUG_INTR, "fifo/write");

                        //nsp32_pio_write(SCpnt);

                        break;

                case BUSPHASE_DATA_IN:
                        nsp32_dbg(NSP32_DEBUG_INTR, "fifo/read");

                        //nsp32_pio_read(SCpnt);

                        break;

                case BUSPHASE_STATUS:
                        nsp32_dbg(NSP32_DEBUG_INTR, "fifo/status");

                        SCpnt->SCp.Status = nsp32_read1(base, SCSI_CSB_IN);

                        break;
                default:
                        nsp32_dbg(NSP32_DEBUG_INTR, "fifo/other phase");
                        nsp32_dbg(NSP32_DEBUG_INTR, "irq_stat=0x%x trans_stat=0x%x", irq_stat, trans_stat);
                        show_busphase(busphase);
                        break;
                }

                goto out;
        }

        /* Phase Change IRQ */
        if (irq_stat & IRQSTATUS_PHASE_CHANGE_IRQ) {
                nsp32_dbg(NSP32_DEBUG_INTR, "phase change IRQ");

                switch(busphase) {
                case BUSPHASE_MESSAGE_IN:
                        nsp32_dbg(NSP32_DEBUG_INTR, "phase chg/msg in");
                        nsp32_msgin_occur(SCpnt, irq_stat, 0);
                        break;
                default:
                        nsp32_msg(KERN_WARNING, "phase chg/other phase?");
                        nsp32_msg(KERN_WARNING, "irq_stat=0x%x trans_stat=0x%x\n",
                                  irq_stat, trans_stat);
                        show_busphase(busphase);
                        break;
                }
                goto out;
        }

        /* PCI_IRQ */
        if (irq_stat & IRQSTATUS_PCI_IRQ) {
                nsp32_dbg(NSP32_DEBUG_INTR, "PCI IRQ occurred");
                /* Do nothing */
        }

        /* BMCNTERR_IRQ */
        if (irq_stat & IRQSTATUS_BMCNTERR_IRQ) {
                nsp32_msg(KERN_ERR, "Received unexpected BMCNTERR IRQ! ");
                /*
                 * TODO: To be implemented improving bus master
                 * transfer reliability when BMCNTERR is occurred in
                 * AutoSCSI phase described in specification.
                 */
        }

#if 0
        nsp32_dbg(NSP32_DEBUG_INTR,
                  "irq_stat=0x%x trans_stat=0x%x", irq_stat, trans_stat);
        show_busphase(busphase);
#endif

 out:
        /* disable IRQ mask */
        nsp32_write2(base, IRQ_CONTROL, 0);

 out2:
        spin_unlock_irqrestore(host->host_lock, flags);

        nsp32_dbg(NSP32_DEBUG_INTR, "exit");

        return IRQ_RETVAL(handled);
}


static int nsp32_show_info(struct seq_file *m, struct Scsi_Host *host)
{
        unsigned long     flags;
        nsp32_hw_data    *data;
        int               hostno;
        unsigned int      base;
        unsigned char     mode_reg;
        int               id, speed;
        long              model;

        hostno = host->host_no;
        data = (nsp32_hw_data *)host->hostdata;
        base = host->io_port;

        seq_puts(m, "NinjaSCSI-32 status\n\n");
        seq_printf(m, "Driver version:        %s, $Revision: 1.33 $\n", nsp32_release_version);
        seq_printf(m, "SCSI host No.:         %d\n",            hostno);
        seq_printf(m, "IRQ:                   %d\n",            host->irq);
        seq_printf(m, "IO:                    0x%lx-0x%lx\n", host->io_port, host->io_port + host->n_io_port - 1);
        seq_printf(m, "MMIO(virtual address): 0x%lx-0x%lx\n",   host->base, host->base + data->MmioLength - 1);
        seq_printf(m, "sg_tablesize:          %d\n",            host->sg_tablesize);
        seq_printf(m, "Chip revision:         0x%x\n",          (nsp32_read2(base, INDEX_REG) >> 8) & 0xff);

        mode_reg = nsp32_index_read1(base, CHIP_MODE);
        model    = data->pci_devid->driver_data;

#ifdef CONFIG_PM
        seq_printf(m, "Power Management:      %s\n",          (mode_reg & OPTF) ? "yes" : "no");
#endif
        seq_printf(m, "OEM:                   %ld, %s\n",     (mode_reg & (OEM0|OEM1)), nsp32_model[model]);

        spin_lock_irqsave(&(data->Lock), flags);
        seq_printf(m, "CurrentSC:             0x%p\n\n",      data->CurrentSC);
        spin_unlock_irqrestore(&(data->Lock), flags);


        seq_puts(m, "SDTR status\n");
        for (id = 0; id < ARRAY_SIZE(data->target); id++) {

                seq_printf(m, "id %d: ", id);

                if (id == host->this_id) {
                        seq_puts(m, "----- NinjaSCSI-32 host adapter\n");
                        continue;
                }

                if (data->target[id].sync_flag == SDTR_DONE) {
                        if (data->target[id].period == 0            &&
                            data->target[id].offset == ASYNC_OFFSET ) {
                                seq_puts(m, "async");
                        } else {
                                seq_puts(m, " sync");
                        }
                } else {
                        seq_puts(m, " none");
                }

                if (data->target[id].period != 0) {

                        speed = 1000000 / (data->target[id].period * 4);

                        seq_printf(m, " transfer %d.%dMB/s, offset %d",
                                speed / 1000,
                                speed % 1000,
                                data->target[id].offset
                                );
                }
                seq_putc(m, '\n');
        }
        return 0;
}



/*
 * Reset parameters and call scsi_done for data->cur_lunt.
 * Be careful setting SCpnt->result = DID_* before calling this function.
 */
static void nsp32_scsi_done(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        unsigned int   base = SCpnt->device->host->io_port;

        scsi_dma_unmap(SCpnt);

        /*
         * clear TRANSFERCONTROL_BM_START
         */
        nsp32_write2(base, TRANSFER_CONTROL, 0);
        nsp32_write4(base, BM_CNT,           0);

        /*
         * call scsi_done
         */
        (*SCpnt->scsi_done)(SCpnt);

        /*
         * reset parameters
         */
        data->cur_lunt->SCpnt = NULL;
        data->cur_lunt        = NULL;
        data->cur_target      = NULL;
        data->CurrentSC      = NULL;
}


/*
 * Bus Free Occur
 *
 * Current Phase is BUSFREE. AutoSCSI is automatically execute BUSFREE phase
 * with ACK reply when below condition is matched:
 *      MsgIn 00: Command Complete.
 *      MsgIn 02: Save Data Pointer.
 *      MsgIn 04: Diconnect.
 * In other case, unexpected BUSFREE is detected.
 */
static int nsp32_busfree_occur(struct scsi_cmnd *SCpnt, unsigned short execph)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        unsigned int base   = SCpnt->device->host->io_port;

        nsp32_dbg(NSP32_DEBUG_BUSFREE, "enter execph=0x%x", execph);
        show_autophase(execph);

        nsp32_write4(base, BM_CNT,           0);
        nsp32_write2(base, TRANSFER_CONTROL, 0);

        /*
         * MsgIn 02: Save Data Pointer
         *
         * VALID:
         *   Save Data Pointer is received. Adjust pointer.
         *   
         * NO-VALID:
         *   SCSI-3 says if Save Data Pointer is not received, then we restart
         *   processing and we can't adjust any SCSI data pointer in next data
         *   phase.
         */
        if (execph & MSGIN_02_VALID) {
                nsp32_dbg(NSP32_DEBUG_BUSFREE, "MsgIn02_Valid");

                /*
                 * Check sack_cnt/saved_sack_cnt, then adjust sg table if
                 * needed.
                 */
                if (!(execph & MSGIN_00_VALID) && 
                    ((execph & DATA_IN_PHASE) || (execph & DATA_OUT_PHASE))) {
                        unsigned int sacklen, s_sacklen;

                        /*
                         * Read SACK count and SAVEDSACK count, then compare.
                         */
                        sacklen   = nsp32_read4(base, SACK_CNT      );
                        s_sacklen = nsp32_read4(base, SAVED_SACK_CNT);

                        /*
                         * If SAVEDSACKCNT == 0, it means SavedDataPointer is
                         * come after data transferring.
                         */
                        if (s_sacklen > 0) {
                                /*
                                 * Comparing between sack and savedsack to
                                 * check the condition of AutoMsgIn03.
                                 *
                                 * If they are same, set msgin03 == TRUE,
                                 * COMMANDCONTROL_AUTO_MSGIN_03 is enabled at
                                 * reselection.  On the other hand, if they
                                 * aren't same, set msgin03 == FALSE, and
                                 * COMMANDCONTROL_AUTO_MSGIN_03 is disabled at
                                 * reselection.
                                 */
                                if (sacklen != s_sacklen) {
                                        data->cur_lunt->msgin03 = FALSE;
                                } else {
                                        data->cur_lunt->msgin03 = TRUE;
                                }

                                nsp32_adjust_busfree(SCpnt, s_sacklen);
                        }
                }

                /* This value has not substitude with valid value yet... */
                //data->cur_lunt->save_datp = data->cur_datp;
        } else {
                /*
                 * no processing.
                 */
        }
        
        if (execph & MSGIN_03_VALID) {
                /* MsgIn03 was valid to be processed. No need processing. */
        }

        /*
         * target SDTR check
         */
        if (data->cur_target->sync_flag & SDTR_INITIATOR) {
                /*
                 * SDTR negotiation pulled by the initiator has not
                 * finished yet. Fall back to ASYNC mode.
                 */
                nsp32_set_async(data, data->cur_target);
                data->cur_target->sync_flag &= ~SDTR_INITIATOR;
                data->cur_target->sync_flag |= SDTR_DONE;
        } else if (data->cur_target->sync_flag & SDTR_TARGET) {
                /*
                 * SDTR negotiation pulled by the target has been
                 * negotiating.
                 */
                if (execph & (MSGIN_00_VALID | MSGIN_04_VALID)) {
                        /* 
                         * If valid message is received, then
                         * negotiation is succeeded.
                         */
                } else {
                        /*
                         * On the contrary, if unexpected bus free is
                         * occurred, then negotiation is failed. Fall
                         * back to ASYNC mode.
                         */
                        nsp32_set_async(data, data->cur_target);
                }
                data->cur_target->sync_flag &= ~SDTR_TARGET;
                data->cur_target->sync_flag |= SDTR_DONE;
        }

        /*
         * It is always ensured by SCSI standard that initiator
         * switches into Bus Free Phase after
         * receiving message 00 (Command Complete), 04 (Disconnect).
         * It's the reason that processing here is valid.
         */
        if (execph & MSGIN_00_VALID) {
                /* MsgIn 00: Command Complete */
                nsp32_dbg(NSP32_DEBUG_BUSFREE, "command complete");

                SCpnt->SCp.Status  = nsp32_read1(base, SCSI_CSB_IN);
                SCpnt->SCp.Message = 0;
                nsp32_dbg(NSP32_DEBUG_BUSFREE, 
                          "normal end stat=0x%x resid=0x%x\n",
                          SCpnt->SCp.Status, scsi_get_resid(SCpnt));
                SCpnt->result = (DID_OK             << 16) |
                                (SCpnt->SCp.Message <<  8) |
                                (SCpnt->SCp.Status  <<  0);
                nsp32_scsi_done(SCpnt);
                /* All operation is done */
                return TRUE;
        } else if (execph & MSGIN_04_VALID) {
                /* MsgIn 04: Disconnect */
                SCpnt->SCp.Status  = nsp32_read1(base, SCSI_CSB_IN);
                SCpnt->SCp.Message = 4;
                
                nsp32_dbg(NSP32_DEBUG_BUSFREE, "disconnect");
                return TRUE;
        } else {
                /* Unexpected bus free */
                nsp32_msg(KERN_WARNING, "unexpected bus free occurred");

                /* DID_ERROR? */
                //SCpnt->result   = (DID_OK << 16) | (SCpnt->SCp.Message << 8) | (SCpnt->SCp.Status << 0);
                SCpnt->result = DID_ERROR << 16;
                nsp32_scsi_done(SCpnt);
                return TRUE;
        }
        return FALSE;
}


/*
 * nsp32_adjust_busfree - adjusting SG table
 *
 * Note: This driver adjust the SG table using SCSI ACK
 *       counter instead of BMCNT counter!
 */
static void nsp32_adjust_busfree(struct scsi_cmnd *SCpnt, unsigned int s_sacklen)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        int                   old_entry = data->cur_entry;
        int                   new_entry;
        int                   sg_num = data->cur_lunt->sg_num;
        nsp32_sgtable *sgt    = data->cur_lunt->sglun->sgt;
        unsigned int          restlen, sentlen;
        u32_le                len, addr;

        nsp32_dbg(NSP32_DEBUG_SGLIST, "old resid=0x%x", scsi_get_resid(SCpnt));

        /* adjust saved SACK count with 4 byte start address boundary */
        s_sacklen -= le32_to_cpu(sgt[old_entry].addr) & 3;

        /*
         * calculate new_entry from sack count and each sgt[].len 
         * calculate the byte which is intent to send
         */
        sentlen = 0;
        for (new_entry = old_entry; new_entry < sg_num; new_entry++) {
                sentlen += (le32_to_cpu(sgt[new_entry].len) & ~SGTEND);
                if (sentlen > s_sacklen) {
                        break;
                }
        }

        /* all sgt is processed */
        if (new_entry == sg_num) {
                goto last;
        }

        if (sentlen == s_sacklen) {
                /* XXX: confirm it's ok or not */
                /* In this case, it's ok because we are at 
                   the head element of the sg. restlen is correctly calculated. */
        }

        /* calculate the rest length for transferring */
        restlen = sentlen - s_sacklen;

        /* update adjusting current SG table entry */
        len  = le32_to_cpu(sgt[new_entry].len);
        addr = le32_to_cpu(sgt[new_entry].addr);
        addr += (len - restlen);
        sgt[new_entry].addr = cpu_to_le32(addr);
        sgt[new_entry].len  = cpu_to_le32(restlen);

        /* set cur_entry with new_entry */
        data->cur_entry = new_entry;
 
        return;

 last:
        if (scsi_get_resid(SCpnt) < sentlen) {
                nsp32_msg(KERN_ERR, "resid underflow");
        }

        scsi_set_resid(SCpnt, scsi_get_resid(SCpnt) - sentlen);
        nsp32_dbg(NSP32_DEBUG_SGLIST, "new resid=0x%x", scsi_get_resid(SCpnt));

        /* update hostdata and lun */

        return;
}


/*
 * It's called MsgOut phase occur.
 * NinjaSCSI-32Bi/UDE automatically processes up to 3 messages in
 * message out phase. It, however, has more than 3 messages,
 * HBA creates the interrupt and we have to process by hand.
 */
static void nsp32_msgout_occur(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        unsigned int base   = SCpnt->device->host->io_port;
        //unsigned short command;
        long new_sgtp;
        int i;
        
        nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR,
                  "enter: msgout_len: 0x%x", data->msgout_len);

        /*
         * If MsgOut phase is occurred without having any
         * message, then No_Operation is sent (SCSI-2).
         */
        if (data->msgout_len == 0) {
                nsp32_build_nop(SCpnt);
        }

        /*
         * Set SGTP ADDR current entry for restarting AUTOSCSI, 
         * because SGTP is incremented next point.
         * There is few statement in the specification...
         */
        new_sgtp = data->cur_lunt->sglun_paddr + 
                   (data->cur_lunt->cur_entry * sizeof(nsp32_sgtable));

        /*
         * send messages
         */
        for (i = 0; i < data->msgout_len; i++) {
                nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR,
                          "%d : 0x%x", i, data->msgoutbuf[i]);

                /*
                 * Check REQ is asserted.
                 */
                nsp32_wait_req(data, ASSERT);

                if (i == (data->msgout_len - 1)) {
                        /*
                         * If the last message, set the AutoSCSI restart
                         * before send back the ack message. AutoSCSI
                         * restart automatically negate ATN signal.
                         */
                        //command = (AUTO_MSGIN_00_OR_04 | AUTO_MSGIN_02);
                        //nsp32_restart_autoscsi(SCpnt, command);
                        nsp32_write2(base, COMMAND_CONTROL,
                                         (CLEAR_CDB_FIFO_POINTER |
                                          AUTO_COMMAND_PHASE     |
                                          AUTOSCSI_RESTART       |
                                          AUTO_MSGIN_00_OR_04    |
                                          AUTO_MSGIN_02          ));
                }
                /*
                 * Write data with SACK, then wait sack is
                 * automatically negated.
                 */
                nsp32_write1(base, SCSI_DATA_WITH_ACK, data->msgoutbuf[i]);
                nsp32_wait_sack(data, NEGATE);

                nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR, "bus: 0x%x\n",
                          nsp32_read1(base, SCSI_BUS_MONITOR));
        };

        data->msgout_len = 0;

        nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR, "exit");
}

/*
 * Restart AutoSCSI
 *
 * Note: Restarting AutoSCSI needs set:
 *              SYNC_REG, ACK_WIDTH, SGT_ADR, TRANSFER_CONTROL
 */
static void nsp32_restart_autoscsi(struct scsi_cmnd *SCpnt, unsigned short command)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        unsigned int   base = data->BaseAddress;
        unsigned short transfer = 0;

        nsp32_dbg(NSP32_DEBUG_RESTART, "enter");

        if (data->cur_target == NULL || data->cur_lunt == NULL) {
                nsp32_msg(KERN_ERR, "Target or Lun is invalid");
        }

        /*
         * set SYNC_REG
         * Don't set BM_START_ADR before setting this register.
         */
        nsp32_write1(base, SYNC_REG, data->cur_target->syncreg);

        /*
         * set ACKWIDTH
         */
        nsp32_write1(base, ACK_WIDTH, data->cur_target->ackwidth);

        /*
         * set SREQ hazard killer sampling rate
         */
        nsp32_write1(base, SREQ_SMPL_RATE, data->cur_target->sample_reg);

        /*
         * set SGT ADDR (physical address)
         */
        nsp32_write4(base, SGT_ADR, data->cur_lunt->sglun_paddr);

        /*
         * set TRANSFER CONTROL REG
         */
        transfer = 0;
        transfer |= (TRANSFER_GO | ALL_COUNTER_CLR);
        if (data->trans_method & NSP32_TRANSFER_BUSMASTER) {
                if (scsi_bufflen(SCpnt) > 0) {
                        transfer |= BM_START;
                }
        } else if (data->trans_method & NSP32_TRANSFER_MMIO) {
                transfer |= CB_MMIO_MODE;
        } else if (data->trans_method & NSP32_TRANSFER_PIO) {
                transfer |= CB_IO_MODE;
        }
        nsp32_write2(base, TRANSFER_CONTROL, transfer);

        /*
         * restart AutoSCSI
         *
         * TODO: COMMANDCONTROL_AUTO_COMMAND_PHASE is needed ?
         */
        command |= (CLEAR_CDB_FIFO_POINTER |
                    AUTO_COMMAND_PHASE     |
                    AUTOSCSI_RESTART       );
        nsp32_write2(base, COMMAND_CONTROL, command);

        nsp32_dbg(NSP32_DEBUG_RESTART, "exit");
}


/*
 * cannot run automatically message in occur
 */
static void nsp32_msgin_occur(struct scsi_cmnd     *SCpnt,
                              unsigned long  irq_status,
                              unsigned short execph)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        unsigned int   base = SCpnt->device->host->io_port;
        unsigned char  msg;
        unsigned char  msgtype;
        unsigned char  newlun;
        unsigned short command  = 0;
        int            msgclear = TRUE;
        long           new_sgtp;
        int            ret;

        /*
         * read first message
         *    Use SCSIDATA_W_ACK instead of SCSIDATAIN, because the procedure
         *    of Message-In have to be processed before sending back SCSI ACK.
         */
        msg = nsp32_read1(base, SCSI_DATA_IN);
        data->msginbuf[(unsigned char)data->msgin_len] = msg;
        msgtype = data->msginbuf[0];
        nsp32_dbg(NSP32_DEBUG_MSGINOCCUR,
                  "enter: msglen: 0x%x msgin: 0x%x msgtype: 0x%x",
                  data->msgin_len, msg, msgtype);

        /*
         * TODO: We need checking whether bus phase is message in?
         */

        /*
         * assert SCSI ACK
         */
        nsp32_sack_assert(data);

        /*
         * processing IDENTIFY
         */
        if (msgtype & 0x80) {
                if (!(irq_status & IRQSTATUS_RESELECT_OCCUER)) {
                        /* Invalid (non reselect) phase */
                        goto reject;
                }

                newlun = msgtype & 0x1f; /* TODO: SPI-3 compliant? */
                ret = nsp32_reselection(SCpnt, newlun);
                if (ret == TRUE) {
                        goto restart;
                } else {
                        goto reject;
                }
        }
        
        /*
         * processing messages except for IDENTIFY
         *
         * TODO: Messages are all SCSI-2 terminology. SCSI-3 compliance is TODO.
         */
        switch (msgtype) {
        /*
         * 1-byte message
         */
        case COMMAND_COMPLETE:
        case DISCONNECT:
                /*
                 * These messages should not be occurred.
                 * They should be processed on AutoSCSI sequencer.
                 */
                nsp32_msg(KERN_WARNING, 
                           "unexpected message of AutoSCSI MsgIn: 0x%x", msg);

                break;
                
        case RESTORE_POINTERS:
                /*
                 * AutoMsgIn03 is disabled, and HBA gets this message.
                 */

                if ((execph & DATA_IN_PHASE) || (execph & DATA_OUT_PHASE)) {
                        unsigned int s_sacklen;

                        s_sacklen = nsp32_read4(base, SAVED_SACK_CNT);
                        if ((execph & MSGIN_02_VALID) && (s_sacklen > 0)) {
                                nsp32_adjust_busfree(SCpnt, s_sacklen);
                        } else {
                                /* No need to rewrite SGT */
                        }
                }
                data->cur_lunt->msgin03 = FALSE;

                /* Update with the new value */

                /* reset SACK/SavedACK counter (or ALL clear?) */
                nsp32_write4(base, CLR_COUNTER, CLRCOUNTER_ALLMASK);

                /*
                 * set new sg pointer
                 */
                new_sgtp = data->cur_lunt->sglun_paddr + 
                        (data->cur_lunt->cur_entry * sizeof(nsp32_sgtable));
                nsp32_write4(base, SGT_ADR, new_sgtp);

                break;

        case SAVE_POINTERS:
                /*
                 * These messages should not be occurred.
                 * They should be processed on AutoSCSI sequencer.
                 */
                nsp32_msg (KERN_WARNING, 
                           "unexpected message of AutoSCSI MsgIn: SAVE_POINTERS");
                
                break;
                
        case MESSAGE_REJECT:
                /* If previous message_out is sending SDTR, and get 
                   message_reject from target, SDTR negotiation is failed */
                if (data->cur_target->sync_flag &
                                (SDTR_INITIATOR | SDTR_TARGET)) {
                        /*
                         * Current target is negotiating SDTR, but it's
                         * failed.  Fall back to async transfer mode, and set
                         * SDTR_DONE.
                         */
                        nsp32_set_async(data, data->cur_target);
                        data->cur_target->sync_flag &= ~SDTR_INITIATOR;
                        data->cur_target->sync_flag |= SDTR_DONE;

                }
                break;

        case LINKED_CMD_COMPLETE:
        case LINKED_FLG_CMD_COMPLETE:
                /* queue tag is not supported currently */
                nsp32_msg (KERN_WARNING, 
                           "unsupported message: 0x%x", msgtype);
                break;

        case INITIATE_RECOVERY:
                /* staring ECA (Extended Contingent Allegiance) state. */
                /* This message is declined in SPI2 or later. */

                goto reject;

        /*
         * 2-byte message
         */
        case SIMPLE_QUEUE_TAG:
        case 0x23:
                /*
                 * 0x23: Ignore_Wide_Residue is not declared in scsi.h.
                 * No support is needed.
                 */
                if (data->msgin_len >= 1) {
                        goto reject;
                }

                /* current position is 1-byte of 2 byte */
                msgclear = FALSE;

                break;

        /*
         * extended message
         */
        case EXTENDED_MESSAGE:
                if (data->msgin_len < 1) {
                        /*
                         * Current position does not reach 2-byte
                         * (2-byte is extended message length).
                         */
                        msgclear = FALSE;
                        break;
                }

                if ((data->msginbuf[1] + 1) > data->msgin_len) {
                        /*
                         * Current extended message has msginbuf[1] + 2
                         * (msgin_len starts counting from 0, so buf[1] + 1).
                         * If current message position is not finished,
                         * continue receiving message.
                         */
                        msgclear = FALSE;
                        break;
                }

                /*
                 * Reach here means regular length of each type of 
                 * extended messages.
                 */
                switch (data->msginbuf[2]) {
                case EXTENDED_MODIFY_DATA_POINTER:
                        /* TODO */
                        goto reject; /* not implemented yet */
                        break;

                case EXTENDED_SDTR:
                        /*
                         * Exchange this message between initiator and target.
                         */
                        if (data->msgin_len != EXTENDED_SDTR_LEN + 1) {
                                /*
                                 * received inappropriate message.
                                 */
                                goto reject;
                                break;
                        }

                        nsp32_analyze_sdtr(SCpnt);

                        break;

                case EXTENDED_EXTENDED_IDENTIFY:
                        /* SCSI-I only, not supported. */
                        goto reject; /* not implemented yet */

                        break;

                case EXTENDED_WDTR:
                        goto reject; /* not implemented yet */

                        break;
                        
                default:
                        goto reject;
                }
                break;
                
        default:
                goto reject;
        }

 restart:
        if (msgclear == TRUE) {
                data->msgin_len = 0;

                /*
                 * If restarting AutoSCSI, but there are some message to out
                 * (msgout_len > 0), set AutoATN, and set SCSIMSGOUT as 0
                 * (MV_VALID = 0). When commandcontrol is written with
                 * AutoSCSI restart, at the same time MsgOutOccur should be
                 * happened (however, such situation is really possible...?).
                 */
                if (data->msgout_len > 0) {     
                        nsp32_write4(base, SCSI_MSG_OUT, 0);
                        command |= AUTO_ATN;
                }

                /*
                 * restart AutoSCSI
                 * If it's failed, COMMANDCONTROL_AUTO_COMMAND_PHASE is needed.
                 */
                command |= (AUTO_MSGIN_00_OR_04 | AUTO_MSGIN_02);

                /*
                 * If current msgin03 is TRUE, then flag on.
                 */
                if (data->cur_lunt->msgin03 == TRUE) {
                        command |= AUTO_MSGIN_03;
                }
                data->cur_lunt->msgin03 = FALSE;
        } else {
                data->msgin_len++;
        }

        /*
         * restart AutoSCSI
         */
        nsp32_restart_autoscsi(SCpnt, command);

        /*
         * wait SCSI REQ negate for REQ-ACK handshake
         */
        nsp32_wait_req(data, NEGATE);

        /*
         * negate SCSI ACK
         */
        nsp32_sack_negate(data);

        nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "exit");

        return;

 reject:
        nsp32_msg(KERN_WARNING, 
                  "invalid or unsupported MessageIn, rejected. "
                  "current msg: 0x%x (len: 0x%x), processing msg: 0x%x",
                  msg, data->msgin_len, msgtype);
        nsp32_build_reject(SCpnt);
        data->msgin_len = 0;

        goto restart;
}

/*
 * 
 */
static void nsp32_analyze_sdtr(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data   *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        nsp32_target     *target     = data->cur_target;
        nsp32_sync_table *synct;
        unsigned char     get_period = data->msginbuf[3];
        unsigned char     get_offset = data->msginbuf[4];
        int               entry;
        int               syncnum;

        nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "enter");

        synct   = data->synct;
        syncnum = data->syncnum;

        /*
         * If this inititor sent the SDTR message, then target responds SDTR,
         * initiator SYNCREG, ACKWIDTH from SDTR parameter.
         * Messages are not appropriate, then send back reject message.
         * If initiator did not send the SDTR, but target sends SDTR, 
         * initiator calculator the appropriate parameter and send back SDTR.
         */     
        if (target->sync_flag & SDTR_INITIATOR) {
                /*
                 * Initiator sent SDTR, the target responds and
                 * send back negotiation SDTR.
                 */
                nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "target responds SDTR");
        
                target->sync_flag &= ~SDTR_INITIATOR;
                target->sync_flag |= SDTR_DONE;

                /*
                 * offset:
                 */
                if (get_offset > SYNC_OFFSET) {
                        /*
                         * Negotiation is failed, the target send back
                         * unexpected offset value.
                         */
                        goto reject;
                }
                
                if (get_offset == ASYNC_OFFSET) {
                        /*
                         * Negotiation is succeeded, the target want
                         * to fall back into asynchronous transfer mode.
                         */
                        goto async;
                }

                /*
                 * period:
                 *    Check whether sync period is too short. If too short,
                 *    fall back to async mode. If it's ok, then investigate
                 *    the received sync period. If sync period is acceptable
                 *    between sync table start_period and end_period, then
                 *    set this I_T nexus as sent offset and period.
                 *    If it's not acceptable, send back reject and fall back
                 *    to async mode.
                 */
                if (get_period < data->synct[0].period_num) {
                        /*
                         * Negotiation is failed, the target send back
                         * unexpected period value.
                         */
                        goto reject;
                }

                entry = nsp32_search_period_entry(data, target, get_period);

                if (entry < 0) {
                        /*
                         * Target want to use long period which is not 
                         * acceptable NinjaSCSI-32Bi/UDE.
                         */
                        goto reject;
                }

                /*
                 * Set new sync table and offset in this I_T nexus.
                 */
                nsp32_set_sync_entry(data, target, entry, get_offset);
        } else {
                /* Target send SDTR to initiator. */
                nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "target send SDTR");
        
                target->sync_flag |= SDTR_INITIATOR;

                /* offset: */
                if (get_offset > SYNC_OFFSET) {
                        /* send back as SYNC_OFFSET */
                        get_offset = SYNC_OFFSET;
                }

                /* period: */
                if (get_period < data->synct[0].period_num) {
                        get_period = data->synct[0].period_num;
                }

                entry = nsp32_search_period_entry(data, target, get_period);

                if (get_offset == ASYNC_OFFSET || entry < 0) {
                        nsp32_set_async(data, target);
                        nsp32_build_sdtr(SCpnt, 0, ASYNC_OFFSET);
                } else {
                        nsp32_set_sync_entry(data, target, entry, get_offset);
                        nsp32_build_sdtr(SCpnt, get_period, get_offset);
                }
        }

        target->period = get_period;
        nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "exit");
        return;

 reject:
        /*
         * If the current message is unacceptable, send back to the target
         * with reject message.
         */
        nsp32_build_reject(SCpnt);

 async:
        nsp32_set_async(data, target);  /* set as ASYNC transfer mode */

        target->period = 0;
        nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "exit: set async");
        return;
}


/*
 * Search config entry number matched in sync_table from given
 * target and speed period value. If failed to search, return negative value.
 */
static int nsp32_search_period_entry(nsp32_hw_data *data,
                                     nsp32_target  *target,
                                     unsigned char  period)
{
        int i;

        if (target->limit_entry >= data->syncnum) {
                nsp32_msg(KERN_ERR, "limit_entry exceeds syncnum!");
                target->limit_entry = 0;
        }

        for (i = target->limit_entry; i < data->syncnum; i++) {
                if (period >= data->synct[i].start_period &&
                    period <= data->synct[i].end_period) {
                                break;
                }
        }

        /*
         * Check given period value is over the sync_table value.
         * If so, return max value.
         */
        if (i == data->syncnum) {
                i = -1;
        }

        return i;
}


/*
 * target <-> initiator use ASYNC transfer
 */
static void nsp32_set_async(nsp32_hw_data *data, nsp32_target *target)
{
        unsigned char period = data->synct[target->limit_entry].period_num;

        target->offset     = ASYNC_OFFSET;
        target->period     = 0;
        target->syncreg    = TO_SYNCREG(period, ASYNC_OFFSET);
        target->ackwidth   = 0;
        target->sample_reg = 0;

        nsp32_dbg(NSP32_DEBUG_SYNC, "set async");
}


/*
 * target <-> initiator use maximum SYNC transfer
 */
static void nsp32_set_max_sync(nsp32_hw_data *data,
                               nsp32_target  *target,
                               unsigned char *period,
                               unsigned char *offset)
{
        unsigned char period_num, ackwidth;

        period_num = data->synct[target->limit_entry].period_num;
        *period    = data->synct[target->limit_entry].start_period;
        ackwidth   = data->synct[target->limit_entry].ackwidth;
        *offset    = SYNC_OFFSET;

        target->syncreg    = TO_SYNCREG(period_num, *offset);
        target->ackwidth   = ackwidth;
        target->offset     = *offset;
        target->sample_reg = 0;       /* disable SREQ sampling */
}


/*
 * target <-> initiator use entry number speed
 */
static void nsp32_set_sync_entry(nsp32_hw_data *data,
                                 nsp32_target  *target,
                                 int            entry,
                                 unsigned char  offset)
{
        unsigned char period, ackwidth, sample_rate;

        period      = data->synct[entry].period_num;
        ackwidth    = data->synct[entry].ackwidth;
        sample_rate = data->synct[entry].sample_rate;

        target->syncreg    = TO_SYNCREG(period, offset);
        target->ackwidth   = ackwidth;
        target->offset     = offset;
        target->sample_reg = sample_rate | SAMPLING_ENABLE;

        nsp32_dbg(NSP32_DEBUG_SYNC, "set sync");
}


/*
 * It waits until SCSI REQ becomes assertion or negation state.
 *
 * Note: If nsp32_msgin_occur is called, we asserts SCSI ACK. Then
 *     connected target responds SCSI REQ negation.  We have to wait
 *     SCSI REQ becomes negation in order to negate SCSI ACK signal for
 *     REQ-ACK handshake.
 */
static void nsp32_wait_req(nsp32_hw_data *data, int state)
{
        unsigned int  base      = data->BaseAddress;
        int           wait_time = 0;
        unsigned char bus, req_bit;

        if (!((state == ASSERT) || (state == NEGATE))) {
                nsp32_msg(KERN_ERR, "unknown state designation");
        }
        /* REQ is BIT(5) */
        req_bit = (state == ASSERT ? BUSMON_REQ : 0);

        do {
                bus = nsp32_read1(base, SCSI_BUS_MONITOR);
                if ((bus & BUSMON_REQ) == req_bit) {
                        nsp32_dbg(NSP32_DEBUG_WAIT, 
                                  "wait_time: %d", wait_time);
                        return;
                }
                udelay(1);
                wait_time++;
        } while (wait_time < REQSACK_TIMEOUT_TIME);

        nsp32_msg(KERN_WARNING, "wait REQ timeout, req_bit: 0x%x", req_bit);
}

/*
 * It waits until SCSI SACK becomes assertion or negation state.
 */
static void nsp32_wait_sack(nsp32_hw_data *data, int state)
{
        unsigned int  base      = data->BaseAddress;
        int           wait_time = 0;
        unsigned char bus, ack_bit;

        if (!((state == ASSERT) || (state == NEGATE))) {
                nsp32_msg(KERN_ERR, "unknown state designation");
        }
        /* ACK is BIT(4) */
        ack_bit = (state == ASSERT ? BUSMON_ACK : 0);

        do {
                bus = nsp32_read1(base, SCSI_BUS_MONITOR);
                if ((bus & BUSMON_ACK) == ack_bit) {
                        nsp32_dbg(NSP32_DEBUG_WAIT,
                                  "wait_time: %d", wait_time);
                        return;
                }
                udelay(1);
                wait_time++;
        } while (wait_time < REQSACK_TIMEOUT_TIME);

        nsp32_msg(KERN_WARNING, "wait SACK timeout, ack_bit: 0x%x", ack_bit);
}

/*
 * assert SCSI ACK
 *
 * Note: SCSI ACK assertion needs with ACKENB=1, AUTODIRECTION=1.
 */
static void nsp32_sack_assert(nsp32_hw_data *data)
{
        unsigned int  base = data->BaseAddress;
        unsigned char busctrl;

        busctrl  = nsp32_read1(base, SCSI_BUS_CONTROL);
        busctrl |= (BUSCTL_ACK | AUTODIRECTION | ACKENB);
        nsp32_write1(base, SCSI_BUS_CONTROL, busctrl);
}

/*
 * negate SCSI ACK
 */
static void nsp32_sack_negate(nsp32_hw_data *data)
{
        unsigned int  base = data->BaseAddress;
        unsigned char busctrl;

        busctrl  = nsp32_read1(base, SCSI_BUS_CONTROL);
        busctrl &= ~BUSCTL_ACK;
        nsp32_write1(base, SCSI_BUS_CONTROL, busctrl);
}



/*
 * Note: n_io_port is defined as 0x7f because I/O register port is
 *       assigned as:
 *      0x800-0x8ff: memory mapped I/O port
 *      0x900-0xbff: (map same 0x800-0x8ff I/O port image repeatedly)
 *      0xc00-0xfff: CardBus status registers
 */
static int nsp32_detect(struct pci_dev *pdev)
{
        struct Scsi_Host *host; /* registered host structure */
        struct resource  *res;
        nsp32_hw_data    *data;
        int               ret;
        int               i, j;

        nsp32_dbg(NSP32_DEBUG_REGISTER, "enter");

        /*
         * register this HBA as SCSI device
         */
        host = scsi_host_alloc(&nsp32_template, sizeof(nsp32_hw_data));
        if (host == NULL) {
                nsp32_msg (KERN_ERR, "failed to scsi register");
                goto err;
        }

        /*
         * set nsp32_hw_data
         */
        data = (nsp32_hw_data *)host->hostdata;

        memcpy(data, &nsp32_data_base, sizeof(nsp32_hw_data));

        host->irq       = data->IrqNumber;
        host->io_port   = data->BaseAddress;
        host->unique_id = data->BaseAddress;
        host->n_io_port = data->NumAddress;
        host->base      = (unsigned long)data->MmioAddress;

        data->Host      = host;
        spin_lock_init(&(data->Lock));

        data->cur_lunt   = NULL;
        data->cur_target = NULL;

        /*
         * Bus master transfer mode is supported currently.
         */
        data->trans_method = NSP32_TRANSFER_BUSMASTER;

        /*
         * Set clock div, CLOCK_4 (HBA has own external clock, and
         * dividing * 100ns/4).
         * Currently CLOCK_4 has only tested, not for CLOCK_2/PCICLK yet.
         */
        data->clock = CLOCK_4;

        /*
         * Select appropriate nsp32_sync_table and set I_CLOCKDIV.
         */
        switch (data->clock) {
        case CLOCK_4:
                /* If data->clock is CLOCK_4, then select 40M sync table. */
                data->synct   = nsp32_sync_table_40M;
                data->syncnum = ARRAY_SIZE(nsp32_sync_table_40M);
                break;
        case CLOCK_2:
                /* If data->clock is CLOCK_2, then select 20M sync table. */
                data->synct   = nsp32_sync_table_20M;
                data->syncnum = ARRAY_SIZE(nsp32_sync_table_20M);
                break;
        case PCICLK:
                /* If data->clock is PCICLK, then select pci sync table. */
                data->synct   = nsp32_sync_table_pci;
                data->syncnum = ARRAY_SIZE(nsp32_sync_table_pci);
                break;
        default:
                nsp32_msg(KERN_WARNING,
                          "Invalid clock div is selected, set CLOCK_4.");
                /* Use default value CLOCK_4 */
                data->clock   = CLOCK_4;
                data->synct   = nsp32_sync_table_40M;
                data->syncnum = ARRAY_SIZE(nsp32_sync_table_40M);
        }

        /*
         * setup nsp32_lunt
         */

        /*
         * setup DMA 
         */
        if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)) != 0) {
                nsp32_msg (KERN_ERR, "failed to set PCI DMA mask");
                goto scsi_unregister;
        }

        /*
         * allocate autoparam DMA resource.
         */
        data->autoparam = dma_alloc_coherent(&pdev->dev,
                        sizeof(nsp32_autoparam), &(data->auto_paddr),
                        GFP_KERNEL);
        if (data->autoparam == NULL) {
                nsp32_msg(KERN_ERR, "failed to allocate DMA memory");
                goto scsi_unregister;
        }

        /*
         * allocate scatter-gather DMA resource.
         */
        data->sg_list = dma_alloc_coherent(&pdev->dev, NSP32_SG_TABLE_SIZE,
                        &data->sg_paddr, GFP_KERNEL);
        if (data->sg_list == NULL) {
                nsp32_msg(KERN_ERR, "failed to allocate DMA memory");
                goto free_autoparam;
        }

        for (i = 0; i < ARRAY_SIZE(data->lunt); i++) {
                for (j = 0; j < ARRAY_SIZE(data->lunt[0]); j++) {
                        int offset = i * ARRAY_SIZE(data->lunt[0]) + j;
                        nsp32_lunt tmp = {
                                .SCpnt       = NULL,
                                .save_datp   = 0,
                                .msgin03     = FALSE,
                                .sg_num      = 0,
                                .cur_entry   = 0,
                                .sglun       = &(data->sg_list[offset]),
                                .sglun_paddr = data->sg_paddr + (offset * sizeof(nsp32_sglun)),
                        };

                        data->lunt[i][j] = tmp;
                }
        }

        /*
         * setup target
         */
        for (i = 0; i < ARRAY_SIZE(data->target); i++) {
                nsp32_target *target = &(data->target[i]);

                target->limit_entry  = 0;
                target->sync_flag    = 0;
                nsp32_set_async(data, target);
        }

        /*
         * EEPROM check
         */
        ret = nsp32_getprom_param(data);
        if (ret == FALSE) {
                data->resettime = 3;    /* default 3 */
        }

        /*
         * setup HBA
         */
        nsp32hw_init(data);

        snprintf(data->info_str, sizeof(data->info_str),
                 "NinjaSCSI-32Bi/UDE: irq %d, io 0x%lx+0x%x",
                 host->irq, host->io_port, host->n_io_port);

        /*
         * SCSI bus reset
         *
         * Note: It's important to reset SCSI bus in initialization phase.
         *     NinjaSCSI-32Bi/UDE HBA EEPROM seems to exchange SDTR when
         *     system is coming up, so SCSI devices connected to HBA is set as
         *     un-asynchronous mode.  It brings the merit that this HBA is
         *     ready to start synchronous transfer without any preparation,
         *     but we are difficult to control transfer speed.  In addition,
         *     it prevents device transfer speed from effecting EEPROM start-up
         *     SDTR.  NinjaSCSI-32Bi/UDE has the feature if EEPROM is set as
         *     Auto Mode, then FAST-10M is selected when SCSI devices are
         *     connected same or more than 4 devices.  It should be avoided
         *     depending on this specification. Thus, resetting the SCSI bus
         *     restores all connected SCSI devices to asynchronous mode, then
         *     this driver set SDTR safely later, and we can control all SCSI
         *     device transfer mode.
         */
        nsp32_do_bus_reset(data);

        ret = request_irq(host->irq, do_nsp32_isr, IRQF_SHARED, "nsp32", data);
        if (ret < 0) {
                nsp32_msg(KERN_ERR, "Unable to allocate IRQ for NinjaSCSI32 "
                          "SCSI PCI controller. Interrupt: %d", host->irq);
                goto free_sg_list;
        }

        /*
         * PCI IO register
         */
        res = request_region(host->io_port, host->n_io_port, "nsp32");
        if (res == NULL) {
                nsp32_msg(KERN_ERR, 
                          "I/O region 0x%lx+0x%lx is already used",
                          data->BaseAddress, data->NumAddress);
                goto free_irq;
        }

        ret = scsi_add_host(host, &pdev->dev);
        if (ret) {
                nsp32_msg(KERN_ERR, "failed to add scsi host");
                goto free_region;
        }
        scsi_scan_host(host);
        pci_set_drvdata(pdev, host);
        return 0;

 free_region:
        release_region(host->io_port, host->n_io_port);

 free_irq:
        free_irq(host->irq, data);

 free_sg_list:
        dma_free_coherent(&pdev->dev, NSP32_SG_TABLE_SIZE,
                            data->sg_list, data->sg_paddr);

 free_autoparam:
        dma_free_coherent(&pdev->dev, sizeof(nsp32_autoparam),
                            data->autoparam, data->auto_paddr);
        
 scsi_unregister:
        scsi_host_put(host);

 err:
        return 1;
}

static int nsp32_release(struct Scsi_Host *host)
{
        nsp32_hw_data *data = (nsp32_hw_data *)host->hostdata;

        if (data->autoparam) {
                dma_free_coherent(&data->Pci->dev, sizeof(nsp32_autoparam),
                                    data->autoparam, data->auto_paddr);
        }

        if (data->sg_list) {
                dma_free_coherent(&data->Pci->dev, NSP32_SG_TABLE_SIZE,
                                    data->sg_list, data->sg_paddr);
        }

        if (host->irq) {
                free_irq(host->irq, data);
        }

        if (host->io_port && host->n_io_port) {
                release_region(host->io_port, host->n_io_port);
        }

        if (data->MmioAddress) {
                iounmap(data->MmioAddress);
        }

        return 0;
}

static const char *nsp32_info(struct Scsi_Host *shpnt)
{
        nsp32_hw_data *data = (nsp32_hw_data *)shpnt->hostdata;

        return data->info_str;
}


/****************************************************************************
 * error handler
 */
static int nsp32_eh_abort(struct scsi_cmnd *SCpnt)
{
        nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
        unsigned int   base = SCpnt->device->host->io_port;

        nsp32_msg(KERN_WARNING, "abort");

        if (data->cur_lunt->SCpnt == NULL) {
                nsp32_dbg(NSP32_DEBUG_BUSRESET, "abort failed");
                return FAILED;
        }

        if (data->cur_target->sync_flag & (SDTR_INITIATOR | SDTR_TARGET)) {
                /* reset SDTR negotiation */
                data->cur_target->sync_flag = 0;
                nsp32_set_async(data, data->cur_target);
        }

        nsp32_write2(base, TRANSFER_CONTROL, 0);
        nsp32_write2(base, BM_CNT,           0);

        SCpnt->result = DID_ABORT << 16;
        nsp32_scsi_done(SCpnt);

        nsp32_dbg(NSP32_DEBUG_BUSRESET, "abort success");
        return SUCCESS;
}

static void nsp32_do_bus_reset(nsp32_hw_data *data)
{
        unsigned int   base = data->BaseAddress;
        unsigned short intrdat;
        int i;

        nsp32_dbg(NSP32_DEBUG_BUSRESET, "in");

        /*
         * stop all transfer
         * clear TRANSFERCONTROL_BM_START
         * clear counter
         */
        nsp32_write2(base, TRANSFER_CONTROL, 0);
        nsp32_write4(base, BM_CNT,           0);
        nsp32_write4(base, CLR_COUNTER,      CLRCOUNTER_ALLMASK);

        /*
         * fall back to asynchronous transfer mode
         * initialize SDTR negotiation flag
         */
        for (i = 0; i < ARRAY_SIZE(data->target); i++) {
                nsp32_target *target = &data->target[i];

                target->sync_flag = 0;
                nsp32_set_async(data, target);
        }

        /*
         * reset SCSI bus
         */
        nsp32_write1(base, SCSI_BUS_CONTROL, BUSCTL_RST);
        mdelay(RESET_HOLD_TIME / 1000);
        nsp32_write1(base, SCSI_BUS_CONTROL, 0);
        for(i = 0; i < 5; i++) {
                intrdat = nsp32_read2(base, IRQ_STATUS); /* dummy read */
                nsp32_dbg(NSP32_DEBUG_BUSRESET, "irq:1: 0x%x", intrdat);
        }

        data->CurrentSC = NULL;
}

static int nsp32_eh_host_reset(struct scsi_cmnd *SCpnt)
{
        struct Scsi_Host *host = SCpnt->device->host;
        unsigned int      base = SCpnt->device->host->io_port;
        nsp32_hw_data    *data = (nsp32_hw_data *)host->hostdata;

        nsp32_msg(KERN_INFO, "Host Reset");     
        nsp32_dbg(NSP32_DEBUG_BUSRESET, "SCpnt=0x%x", SCpnt);

        spin_lock_irq(SCpnt->device->host->host_lock);

        nsp32hw_init(data);
        nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK);
        nsp32_do_bus_reset(data);
        nsp32_write2(base, IRQ_CONTROL, 0);

        spin_unlock_irq(SCpnt->device->host->host_lock);
        return SUCCESS; /* Host reset is succeeded at any time. */
}


/**************************************************************************
 * EEPROM handler
 */

/*
 * getting EEPROM parameter
 */
static int nsp32_getprom_param(nsp32_hw_data *data)
{
        int vendor = data->pci_devid->vendor;
        int device = data->pci_devid->device;
        int ret, val, i;

        /*
         * EEPROM checking.
         */
        ret = nsp32_prom_read(data, 0x7e);
        if (ret != 0x55) {
                nsp32_msg(KERN_INFO, "No EEPROM detected: 0x%x", ret);
                return FALSE;
        }
        ret = nsp32_prom_read(data, 0x7f);
        if (ret != 0xaa) {
                nsp32_msg(KERN_INFO, "Invalid number: 0x%x", ret);
                return FALSE;
        }

        /*
         * check EEPROM type
         */
        if (vendor == PCI_VENDOR_ID_WORKBIT &&
            device == PCI_DEVICE_ID_WORKBIT_STANDARD) {
                ret = nsp32_getprom_c16(data);
        } else if (vendor == PCI_VENDOR_ID_WORKBIT &&
                   device == PCI_DEVICE_ID_NINJASCSI_32BIB_LOGITEC) {
                ret = nsp32_getprom_at24(data);
        } else if (vendor == PCI_VENDOR_ID_WORKBIT &&
                   device == PCI_DEVICE_ID_NINJASCSI_32UDE_MELCO ) {
                ret = nsp32_getprom_at24(data);
        } else {
                nsp32_msg(KERN_WARNING, "Unknown EEPROM");
                ret = FALSE;
        }

        /* for debug : SPROM data full checking */
        for (i = 0; i <= 0x1f; i++) {
                val = nsp32_prom_read(data, i);
                nsp32_dbg(NSP32_DEBUG_EEPROM,
                          "rom address 0x%x : 0x%x", i, val);
        }

        return ret;
}


/*
 * AT24C01A (Logitec: LHA-600S), AT24C02 (Melco Buffalo: IFC-USLP) data map:
 *
 *   ROMADDR
 *   0x00 - 0x06 :  Device Synchronous Transfer Period (SCSI ID 0 - 6) 
 *                      Value 0x0: ASYNC, 0x0c: Ultra-20M, 0x19: Fast-10M
 *   0x07        :  HBA Synchronous Transfer Period
 *                      Value 0: AutoSync, 1: Manual Setting
 *   0x08 - 0x0f :  Not Used? (0x0)
 *   0x10        :  Bus Termination
 *                      Value 0: Auto[ON], 1: ON, 2: OFF
 *   0x11        :  Not Used? (0)
 *   0x12        :  Bus Reset Delay Time (0x03)
 *   0x13        :  Bootable CD Support
 *                      Value 0: Disable, 1: Enable
 *   0x14        :  Device Scan
 *                      Bit   7  6  5  4  3  2  1  0
 *                            |  <----------------->
 *                            |    SCSI ID: Value 0: Skip, 1: YES
 *                            |->  Value 0: ALL scan,  Value 1: Manual
 *   0x15 - 0x1b :  Not Used? (0)
 *   0x1c        :  Constant? (0x01) (clock div?)
 *   0x1d - 0x7c :  Not Used (0xff)
 *   0x7d        :  Not Used? (0xff)
 *   0x7e        :  Constant (0x55), Validity signature
 *   0x7f        :  Constant (0xaa), Validity signature
 */
static int nsp32_getprom_at24(nsp32_hw_data *data)
{
        int           ret, i;
        int           auto_sync;
        nsp32_target *target;
        int           entry;

        /*
         * Reset time which is designated by EEPROM.

         *
         * TODO: Not used yet.
         */
        data->resettime = nsp32_prom_read(data, 0x12);

        /*
         * HBA Synchronous Transfer Period
         *
         * Note: auto_sync = 0: auto, 1: manual.  Ninja SCSI HBA spec says
         *      that if auto_sync is 0 (auto), and connected SCSI devices are
         *      same or lower than 3, then transfer speed is set as ULTRA-20M.
         *      On the contrary if connected SCSI devices are same or higher
         *      than 4, then transfer speed is set as FAST-10M.
         *
         *      I break this rule. The number of connected SCSI devices are
         *      only ignored. If auto_sync is 0 (auto), then transfer speed is
         *      forced as ULTRA-20M.
         */
        ret = nsp32_prom_read(data, 0x07);
        switch (ret) {
        case 0:
                auto_sync = TRUE;
                break;
        case 1:
                auto_sync = FALSE;
                break;
        default:
                nsp32_msg(KERN_WARNING,
                          "Unsupported Auto Sync mode. Fall back to manual mode.");
                auto_sync = TRUE;
        }

        if (trans_mode == ULTRA20M_MODE) {
                auto_sync = TRUE;
        }

        /*
         * each device Synchronous Transfer Period
         */
        for (i = 0; i < NSP32_HOST_SCSIID; i++) {
                target = &data->target[i];
                if (auto_sync == TRUE) {
                        target->limit_entry = 0;   /* set as ULTRA20M */
                } else {
                        ret   = nsp32_prom_read(data, i);
                        entry = nsp32_search_period_entry(data, target, ret);
                        if (entry < 0) {
                                /* search failed... set maximum speed */
                                entry = 0;
                        }
                        target->limit_entry = entry;
                }
        }

        return TRUE;
}


/*
 * C16 110 (I-O Data: SC-NBD) data map:
 *
 *   ROMADDR
 *   0x00 - 0x06 :  Device Synchronous Transfer Period (SCSI ID 0 - 6) 
 *                      Value 0x0: 20MB/S, 0x1: 10MB/S, 0x2: 5MB/S, 0x3: ASYNC
 *   0x07        :  0 (HBA Synchronous Transfer Period: Auto Sync)
 *   0x08 - 0x0f :  Not Used? (0x0)
 *   0x10        :  Transfer Mode
 *                      Value 0: PIO, 1: Busmater
 *   0x11        :  Bus Reset Delay Time (0x00-0x20)
 *   0x12        :  Bus Termination
 *                      Value 0: Disable, 1: Enable
 *   0x13 - 0x19 :  Disconnection
 *                      Value 0: Disable, 1: Enable
 *   0x1a - 0x7c :  Not Used? (0)
 *   0x7d        :  Not Used? (0xf8)
 *   0x7e        :  Constant (0x55), Validity signature
 *   0x7f        :  Constant (0xaa), Validity signature
 */
static int nsp32_getprom_c16(nsp32_hw_data *data)
{
        int           ret, i;
        nsp32_target *target;
        int           entry, val;

        /*
         * Reset time which is designated by EEPROM.
         *
         * TODO: Not used yet.
         */
        data->resettime = nsp32_prom_read(data, 0x11);

        /*
         * each device Synchronous Transfer Period
         */
        for (i = 0; i < NSP32_HOST_SCSIID; i++) {
                target = &data->target[i];
                ret = nsp32_prom_read(data, i);
                switch (ret) {
                case 0:         /* 20MB/s */
                        val = 0x0c;
                        break;
                case 1:         /* 10MB/s */
                        val = 0x19;
                        break;
                case 2:         /* 5MB/s */
                        val = 0x32;
                        break;
                case 3:         /* ASYNC */
                        val = 0x00;
                        break;
                default:        /* default 20MB/s */
                        val = 0x0c;
                        break;
                }
                entry = nsp32_search_period_entry(data, target, val);
                if (entry < 0 || trans_mode == ULTRA20M_MODE) {
                        /* search failed... set maximum speed */
                        entry = 0;
                }
                target->limit_entry = entry;
        }

        return TRUE;
}


/*
 * Atmel AT24C01A (drived in 5V) serial EEPROM routines
 */
static int nsp32_prom_read(nsp32_hw_data *data, int romaddr)
{
        int i, val;

        /* start condition */
        nsp32_prom_start(data);

        /* device address */
        nsp32_prom_write_bit(data, 1);  /* 1 */
        nsp32_prom_write_bit(data, 0);  /* 0 */
        nsp32_prom_write_bit(data, 1);  /* 1 */
        nsp32_prom_write_bit(data, 0);  /* 0 */
        nsp32_prom_write_bit(data, 0);  /* A2: 0 (GND) */
        nsp32_prom_write_bit(data, 0);  /* A1: 0 (GND) */
        nsp32_prom_write_bit(data, 0);  /* A0: 0 (GND) */

        /* R/W: W for dummy write */
        nsp32_prom_write_bit(data, 0);

        /* ack */
        nsp32_prom_write_bit(data, 0);

        /* word address */
        for (i = 7; i >= 0; i--) {
                nsp32_prom_write_bit(data, ((romaddr >> i) & 1));
        }

        /* ack */
        nsp32_prom_write_bit(data, 0);

        /* start condition */
        nsp32_prom_start(data);

        /* device address */
        nsp32_prom_write_bit(data, 1);  /* 1 */
        nsp32_prom_write_bit(data, 0);  /* 0 */
        nsp32_prom_write_bit(data, 1);  /* 1 */
        nsp32_prom_write_bit(data, 0);  /* 0 */
        nsp32_prom_write_bit(data, 0);  /* A2: 0 (GND) */
        nsp32_prom_write_bit(data, 0);  /* A1: 0 (GND) */
        nsp32_prom_write_bit(data, 0);  /* A0: 0 (GND) */

        /* R/W: R */
        nsp32_prom_write_bit(data, 1);

        /* ack */
        nsp32_prom_write_bit(data, 0);

        /* data... */
        val = 0;
        for (i = 7; i >= 0; i--) {
                val += (nsp32_prom_read_bit(data) << i);
        }
        
        /* no ack */
        nsp32_prom_write_bit(data, 1);

        /* stop condition */
        nsp32_prom_stop(data);

        return val;
}

static void nsp32_prom_set(nsp32_hw_data *data, int bit, int val)
{
        int base = data->BaseAddress;
        int tmp;

        tmp = nsp32_index_read1(base, SERIAL_ROM_CTL);

        if (val == 0) {
                tmp &= ~bit;
        } else {
                tmp |=  bit;
        }

        nsp32_index_write1(base, SERIAL_ROM_CTL, tmp);

        udelay(10);
}

static int nsp32_prom_get(nsp32_hw_data *data, int bit)
{
        int base = data->BaseAddress;
        int tmp, ret;

        if (bit != SDA) {
                nsp32_msg(KERN_ERR, "return value is not appropriate");
                return 0;
        }


        tmp = nsp32_index_read1(base, SERIAL_ROM_CTL) & bit;

        if (tmp == 0) {
                ret = 0;
        } else {
                ret = 1;
        }

        udelay(10);

        return ret;
}

static void nsp32_prom_start (nsp32_hw_data *data)
{
        /* start condition */
        nsp32_prom_set(data, SCL, 1);
        nsp32_prom_set(data, SDA, 1);
        nsp32_prom_set(data, ENA, 1);   /* output mode */
        nsp32_prom_set(data, SDA, 0);   /* keeping SCL=1 and transiting
                                         * SDA 1->0 is start condition */
        nsp32_prom_set(data, SCL, 0);
}

static void nsp32_prom_stop (nsp32_hw_data *data)
{
        /* stop condition */
        nsp32_prom_set(data, SCL, 1);
        nsp32_prom_set(data, SDA, 0);
        nsp32_prom_set(data, ENA, 1);   /* output mode */
        nsp32_prom_set(data, SDA, 1);
        nsp32_prom_set(data, SCL, 0);
}

static void nsp32_prom_write_bit(nsp32_hw_data *data, int val)
{
        /* write */
        nsp32_prom_set(data, SDA, val);
        nsp32_prom_set(data, SCL, 1  );
        nsp32_prom_set(data, SCL, 0  );
}

static int nsp32_prom_read_bit(nsp32_hw_data *data)
{
        int val;

        /* read */
        nsp32_prom_set(data, ENA, 0);   /* input mode */
        nsp32_prom_set(data, SCL, 1);

        val = nsp32_prom_get(data, SDA);

        nsp32_prom_set(data, SCL, 0);
        nsp32_prom_set(data, ENA, 1);   /* output mode */

        return val;
}


/**************************************************************************
 * Power Management
 */
#ifdef CONFIG_PM

/* Device suspended */
static int nsp32_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct Scsi_Host *host = pci_get_drvdata(pdev);

        nsp32_msg(KERN_INFO, "pci-suspend: pdev=0x%p, state=%ld, slot=%s, host=0x%p", pdev, state, pci_name(pdev), host);

        pci_save_state     (pdev);
        pci_disable_device (pdev);
        pci_set_power_state(pdev, pci_choose_state(pdev, state));

        return 0;
}

/* Device woken up */
static int nsp32_resume(struct pci_dev *pdev)
{
        struct Scsi_Host *host = pci_get_drvdata(pdev);
        nsp32_hw_data    *data = (nsp32_hw_data *)host->hostdata;
        unsigned short    reg;

        nsp32_msg(KERN_INFO, "pci-resume: pdev=0x%p, slot=%s, host=0x%p", pdev, pci_name(pdev), host);

        pci_set_power_state(pdev, PCI_D0);
        pci_enable_wake    (pdev, PCI_D0, 0);
        pci_restore_state  (pdev);

        reg = nsp32_read2(data->BaseAddress, INDEX_REG);

        nsp32_msg(KERN_INFO, "io=0x%x reg=0x%x", data->BaseAddress, reg);

        if (reg == 0xffff) {
                nsp32_msg(KERN_INFO, "missing device. abort resume.");
                return 0;
        }

        nsp32hw_init      (data);
        nsp32_do_bus_reset(data);

        nsp32_msg(KERN_INFO, "resume success");

        return 0;
}

#endif

/************************************************************************
 * PCI/Cardbus probe/remove routine
 */
static int nsp32_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
        int ret;
        nsp32_hw_data *data = &nsp32_data_base;

        nsp32_dbg(NSP32_DEBUG_REGISTER, "enter");

        ret = pci_enable_device(pdev);
        if (ret) {
                nsp32_msg(KERN_ERR, "failed to enable pci device");
                return ret;
        }

        data->Pci         = pdev;
        data->pci_devid   = id;
        data->IrqNumber   = pdev->irq;
        data->BaseAddress = pci_resource_start(pdev, 0);
        data->NumAddress  = pci_resource_len  (pdev, 0);
        data->MmioAddress = pci_ioremap_bar(pdev, 1);
        data->MmioLength  = pci_resource_len  (pdev, 1);

        pci_set_master(pdev);

        ret = nsp32_detect(pdev);

        nsp32_msg(KERN_INFO, "irq: %i mmio: %p+0x%lx slot: %s model: %s",
                  pdev->irq,
                  data->MmioAddress, data->MmioLength,
                  pci_name(pdev),
                  nsp32_model[id->driver_data]);

        nsp32_dbg(NSP32_DEBUG_REGISTER, "exit %d", ret);

        return ret;
}

static void nsp32_remove(struct pci_dev *pdev)
{
        struct Scsi_Host *host = pci_get_drvdata(pdev);

        nsp32_dbg(NSP32_DEBUG_REGISTER, "enter");

        scsi_remove_host(host);

        nsp32_release(host);

        scsi_host_put(host);
}

static struct pci_driver nsp32_driver = {
        .name           = "nsp32",
        .id_table       = nsp32_pci_table,
        .probe          = nsp32_probe,
        .remove         = nsp32_remove,
#ifdef CONFIG_PM
        .suspend        = nsp32_suspend, 
        .resume         = nsp32_resume, 
#endif
};

/*********************************************************************
 * Moule entry point
 */
static int __init init_nsp32(void) {
        nsp32_msg(KERN_INFO, "loading...");
        return pci_register_driver(&nsp32_driver);
}

static void __exit exit_nsp32(void) {
        nsp32_msg(KERN_INFO, "unloading...");
        pci_unregister_driver(&nsp32_driver);
}

module_init(init_nsp32);
module_exit(exit_nsp32);

/* end */