// SPDX-License-Identifier: GPL-2.0-or-later
/**************************************************************************
 * Initio 9100 device driver for Linux.
 *
 * Copyright (c) 1994-1998 Initio Corporation
 * Copyright (c) 1998 Bas Vermeulen <bvermeul@blackstar.xs4all.nl>
 * Copyright (c) 2004 Christoph Hellwig <hch@lst.de>
 * Copyright (c) 2007 Red Hat
 *
 *************************************************************************
 *
 * DESCRIPTION:
 *
 * This is the Linux low-level SCSI driver for Initio INI-9X00U/UW SCSI host
 * adapters
 *
 * 08/06/97 hc  - v1.01h
 *              - Support inic-940 and inic-935
 * 09/26/97 hc  - v1.01i
 *              - Make correction from J.W. Schultz suggestion
 * 10/13/97 hc  - Support reset function
 * 10/21/97 hc  - v1.01j
 *              - Support 32 LUN (SCSI 3)
 * 01/14/98 hc  - v1.01k
 *              - Fix memory allocation problem
 * 03/04/98 hc  - v1.01l
 *              - Fix tape rewind which will hang the system problem
 *              - Set can_queue to initio_num_scb
 * 06/25/98 hc  - v1.01m
 *              - Get it work for kernel version >= 2.1.75
 *              - Dynamic assign SCSI bus reset holding time in initio_init()
 * 07/02/98 hc  - v1.01n
 *              - Support 0002134A
 * 08/07/98 hc  - v1.01o
 *              - Change the initio_abort_srb routine to use scsi_done. <01>
 * 09/07/98 hl  - v1.02
 *              - Change the INI9100U define and proc_dir_entry to
 *                reflect the newer Kernel 2.1.118, but the v1.o1o
 *                should work with Kernel 2.1.118.
 * 09/20/98 wh  - v1.02a
 *              - Support Abort command.
 *              - Handle reset routine.
 * 09/21/98 hl  - v1.03
 *              - remove comments.
 * 12/09/98 bv  - v1.03a
 *              - Removed unused code
 * 12/13/98 bv  - v1.03b
 *              - Remove cli() locking for kernels >= 2.1.95. This uses
 *                spinlocks to serialize access to the pSRB_head and
 *                pSRB_tail members of the HCS structure.
 * 09/01/99 bv  - v1.03d
 *              - Fixed a deadlock problem in SMP.
 * 21/01/99 bv  - v1.03e
 *              - Add support for the Domex 3192U PCI SCSI
 *                This is a slightly modified patch by
 *                Brian Macy <bmacy@sunshinecomputing.com>
 * 22/02/99 bv  - v1.03f
 *              - Didn't detect the INIC-950 in 2.0.x correctly.
 *                Now fixed.
 * 05/07/99 bv  - v1.03g
 *              - Changed the assumption that HZ = 100
 * 10/17/03 mc  - v1.04
 *              - added new DMA API support
 * 06/01/04 jmd - v1.04a
 *              - Re-add reset_bus support
 **************************************************************************/

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/stat.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/dma-mapping.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_tcq.h>

#include "initio.h"

#define SENSE_SIZE              14

#define i91u_MAXQUEUE           2
#define i91u_REVID "Initio INI-9X00U/UW SCSI device driver; Revision: 1.04a"

#ifdef DEBUG_i91u
static unsigned int i91u_debug = DEBUG_DEFAULT;
#endif

static int initio_tag_enable = 1;

#ifdef DEBUG_i91u
static int setup_debug = 0;
#endif

static void i91uSCBPost(u8 * pHcb, u8 * pScb);

#define DEBUG_INTERRUPT 0
#define DEBUG_QUEUE     0
#define DEBUG_STATE     0
#define INT_DISC        0

/*--- forward references ---*/
static struct scsi_ctrl_blk *initio_find_busy_scb(struct initio_host * host, u16 tarlun);
static struct scsi_ctrl_blk *initio_find_done_scb(struct initio_host * host);

static int tulip_main(struct initio_host * host);

static int initio_next_state(struct initio_host * host);
static int initio_state_1(struct initio_host * host);
static int initio_state_2(struct initio_host * host);
static int initio_state_3(struct initio_host * host);
static int initio_state_4(struct initio_host * host);
static int initio_state_5(struct initio_host * host);
static int initio_state_6(struct initio_host * host);
static int initio_state_7(struct initio_host * host);
static int initio_xfer_data_in(struct initio_host * host);
static int initio_xfer_data_out(struct initio_host * host);
static int initio_xpad_in(struct initio_host * host);
static int initio_xpad_out(struct initio_host * host);
static int initio_status_msg(struct initio_host * host);

static int initio_msgin(struct initio_host * host);
static int initio_msgin_sync(struct initio_host * host);
static int initio_msgin_accept(struct initio_host * host);
static int initio_msgout_reject(struct initio_host * host);
static int initio_msgin_extend(struct initio_host * host);

static int initio_msgout_ide(struct initio_host * host);
static int initio_msgout_abort_targ(struct initio_host * host);
static int initio_msgout_abort_tag(struct initio_host * host);

static int initio_bus_device_reset(struct initio_host * host);
static void initio_select_atn(struct initio_host * host, struct scsi_ctrl_blk * scb);
static void initio_select_atn3(struct initio_host * host, struct scsi_ctrl_blk * scb);
static void initio_select_atn_stop(struct initio_host * host, struct scsi_ctrl_blk * scb);
static int int_initio_busfree(struct initio_host * host);
static int int_initio_scsi_rst(struct initio_host * host);
static int int_initio_bad_seq(struct initio_host * host);
static int int_initio_resel(struct initio_host * host);
static int initio_sync_done(struct initio_host * host);
static int wdtr_done(struct initio_host * host);
static int wait_tulip(struct initio_host * host);
static int initio_wait_done_disc(struct initio_host * host);
static int initio_wait_disc(struct initio_host * host);
static void tulip_scsi(struct initio_host * host);
static int initio_post_scsi_rst(struct initio_host * host);

static void initio_se2_ew_en(unsigned long base);
static void initio_se2_ew_ds(unsigned long base);
static int initio_se2_rd_all(unsigned long base);
static void initio_se2_update_all(unsigned long base);  /* setup default pattern */
static void initio_read_eeprom(unsigned long base);

/* ---- INTERNAL VARIABLES ---- */

static NVRAM i91unvram;
static NVRAM *i91unvramp;

static u8 i91udftNvRam[64] =
{
        /*----------- header -----------*/
        0x25, 0xc9,             /* Signature    */
        0x40,                   /* Size         */
        0x01,                   /* Revision     */
        /* -- Host Adapter Structure -- */
        0x95,                   /* ModelByte0   */
        0x00,                   /* ModelByte1   */
        0x00,                   /* ModelInfo    */
        0x01,                   /* NumOfCh      */
        NBC1_DEFAULT,           /* BIOSConfig1  */
        0,                      /* BIOSConfig2  */
        0,                      /* HAConfig1    */
        0,                      /* HAConfig2    */
        /* SCSI channel 0 and target Structure  */
        7,                      /* SCSIid       */
        NCC1_DEFAULT,           /* SCSIconfig1  */
        0,                      /* SCSIconfig2  */
        0x10,                   /* NumSCSItarget */

        NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
        NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
        NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
        NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,

        /* SCSI channel 1 and target Structure  */
        7,                      /* SCSIid       */
        NCC1_DEFAULT,           /* SCSIconfig1  */
        0,                      /* SCSIconfig2  */
        0x10,                   /* NumSCSItarget */

        NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
        NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
        NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
        NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0};                  /*      - CheckSum -            */


static u8 initio_rate_tbl[8] =  /* fast 20      */
{
                                /* nanosecond divide by 4 */
        12,                     /* 50ns,  20M   */
        18,                     /* 75ns,  13.3M */
        25,                     /* 100ns, 10M   */
        31,                     /* 125ns, 8M    */
        37,                     /* 150ns, 6.6M  */
        43,                     /* 175ns, 5.7M  */
        50,                     /* 200ns, 5M    */
        62                      /* 250ns, 4M    */
};

static void initio_do_pause(unsigned amount)
{
        /* Pause for amount jiffies */
        unsigned long the_time = jiffies + amount;

        while (time_before_eq(jiffies, the_time))
                cpu_relax();
}

/*-- forward reference --*/

/******************************************************************
 Input: instruction for  Serial E2PROM

 EX: se2_rd(0 call se2_instr() to send address and read command

         StartBit  OP_Code   Address                Data
         --------- --------  ------------------     -------
         1         1 , 0     A5,A4,A3,A2,A1,A0      D15-D0

                 +-----------------------------------------------------
                 |
 CS -----+
                        +--+  +--+  +--+  +--+  +--+
                        ^  |  ^  |  ^  |  ^  |  ^  |
                        |  |  |  |  |  |  |  |  |  |
 CLK -------+  +--+  +--+  +--+  +--+  +--
 (leading edge trigger)

                 +--1-----1--+
                 | SB    OP  |  OP    A5    A4
 DI  ----+           +--0------------------
 (address and cmd sent to nvram)

         -------------------------------------------+
                                                                                                |
 DO                                             +---
 (data sent from nvram)


******************************************************************/

/**
 *      initio_se2_instr        -       bitbang an instruction
 *      @base: Base of InitIO controller
 *      @instr: Instruction for serial E2PROM
 *
 *      Bitbang an instruction out to the serial E2Prom
 */

static void initio_se2_instr(unsigned long base, u8 instr)
{
        int i;
        u8 b;

        outb(SE2CS | SE2DO, base + TUL_NVRAM);          /* cs+start bit */
        udelay(30);
        outb(SE2CS | SE2CLK | SE2DO, base + TUL_NVRAM); /* +CLK */
        udelay(30);

        for (i = 0; i < 8; i++) {
                if (instr & 0x80)
                        b = SE2CS | SE2DO;              /* -CLK+dataBit */
                else
                        b = SE2CS;                      /* -CLK */
                outb(b, base + TUL_NVRAM);
                udelay(30);
                outb(b | SE2CLK, base + TUL_NVRAM);     /* +CLK */
                udelay(30);
                instr <<= 1;
        }
        outb(SE2CS, base + TUL_NVRAM);                  /* -CLK */
        udelay(30);
}


/**
 *      initio_se2_ew_en        -       Enable erase/write
 *      @base: Base address of InitIO controller
 *
 *      Enable erase/write state of serial EEPROM
 */
void initio_se2_ew_en(unsigned long base)
{
        initio_se2_instr(base, 0x30);   /* EWEN */
        outb(0, base + TUL_NVRAM);      /* -CS  */
        udelay(30);
}


/**
 *      initio_se2_ew_ds        -       Disable erase/write
 *      @base: Base address of InitIO controller
 *
 *      Disable erase/write state of serial EEPROM
 */
void initio_se2_ew_ds(unsigned long base)
{
        initio_se2_instr(base, 0);      /* EWDS */
        outb(0, base + TUL_NVRAM);      /* -CS  */
        udelay(30);
}


/**
 *      initio_se2_rd           -       read E2PROM word
 *      @base: Base of InitIO controller
 *      @addr: Address of word in E2PROM
 *
 *      Read a word from the NV E2PROM device
 */
static u16 initio_se2_rd(unsigned long base, u8 addr)
{
        u8 instr, rb;
        u16 val = 0;
        int i;

        instr = (u8) (addr | 0x80);
        initio_se2_instr(base, instr);  /* READ INSTR */

        for (i = 15; i >= 0; i--) {
                outb(SE2CS | SE2CLK, base + TUL_NVRAM); /* +CLK */
                udelay(30);
                outb(SE2CS, base + TUL_NVRAM);          /* -CLK */

                /* sample data after the following edge of clock  */
                rb = inb(base + TUL_NVRAM);
                rb &= SE2DI;
                val += (rb << i);
                udelay(30);     /* 6/20/95 */
        }

        outb(0, base + TUL_NVRAM);              /* no chip select */
        udelay(30);
        return val;
}

/**
 *      initio_se2_wr           -       read E2PROM word
 *      @base: Base of InitIO controller
 *      @addr: Address of word in E2PROM
 *      @val: Value to write
 *
 *      Write a word to the NV E2PROM device. Used when recovering from
 *      a problem with the NV.
 */
static void initio_se2_wr(unsigned long base, u8 addr, u16 val)
{
        u8 instr;
        int i;

        instr = (u8) (addr | 0x40);
        initio_se2_instr(base, instr);  /* WRITE INSTR */
        for (i = 15; i >= 0; i--) {
                if (val & 0x8000)
                        outb(SE2CS | SE2DO, base + TUL_NVRAM);  /* -CLK+dataBit 1 */
                else
                        outb(SE2CS, base + TUL_NVRAM);          /* -CLK+dataBit 0 */
                udelay(30);
                outb(SE2CS | SE2CLK, base + TUL_NVRAM);         /* +CLK */
                udelay(30);
                val <<= 1;
        }
        outb(SE2CS, base + TUL_NVRAM);                          /* -CLK */
        udelay(30);
        outb(0, base + TUL_NVRAM);                              /* -CS  */
        udelay(30);

        outb(SE2CS, base + TUL_NVRAM);                          /* +CS  */
        udelay(30);

        for (;;) {
                outb(SE2CS | SE2CLK, base + TUL_NVRAM);         /* +CLK */
                udelay(30);
                outb(SE2CS, base + TUL_NVRAM);                  /* -CLK */
                udelay(30);
                if (inb(base + TUL_NVRAM) & SE2DI)
                        break;  /* write complete */
        }
        outb(0, base + TUL_NVRAM);                              /* -CS */
}

/**
 *      initio_se2_rd_all       -       read hostadapter NV configuration
 *      @base: Base address of InitIO controller
 *
 *      Reads the E2PROM data into main memory. Ensures that the checksum
 *      and header marker are valid. Returns 1 on success -1 on error.
 */

static int initio_se2_rd_all(unsigned long base)
{
        int i;
        u16 chksum = 0;
        u16 *np;

        i91unvramp = &i91unvram;
        np = (u16 *) i91unvramp;
        for (i = 0; i < 32; i++)
                *np++ = initio_se2_rd(base, i);

        /* Is signature "ini" ok ? */
        if (i91unvramp->NVM_Signature != INI_SIGNATURE)
                return -1;
        /* Is ckecksum ok ? */
        np = (u16 *) i91unvramp;
        for (i = 0; i < 31; i++)
                chksum += *np++;
        if (i91unvramp->NVM_CheckSum != chksum)
                return -1;
        return 1;
}

/**
 *      initio_se2_update_all           -       Update E2PROM
 *      @base: Base of InitIO controller
 *
 *      Update the E2PROM by wrting any changes into the E2PROM
 *      chip, rewriting the checksum.
 */
static void initio_se2_update_all(unsigned long base)
{                               /* setup default pattern */
        int i;
        u16 chksum = 0;
        u16 *np, *np1;

        i91unvramp = &i91unvram;
        /* Calculate checksum first */
        np = (u16 *) i91udftNvRam;
        for (i = 0; i < 31; i++)
                chksum += *np++;
        *np = chksum;
        initio_se2_ew_en(base); /* Enable write  */

        np = (u16 *) i91udftNvRam;
        np1 = (u16 *) i91unvramp;
        for (i = 0; i < 32; i++, np++, np1++) {
                if (*np != *np1)
                        initio_se2_wr(base, i, *np);
        }
        initio_se2_ew_ds(base); /* Disable write   */
}

/**
 *      initio_read_eeprom              -       Retrieve configuration
 *      @base: Base of InitIO Host Adapter
 *
 *      Retrieve the host adapter configuration data from E2Prom. If the
 *      data is invalid then the defaults are used and are also restored
 *      into the E2PROM. This forms the access point for the SCSI driver
 *      into the E2PROM layer, the other functions for the E2PROM are all
 *      internal use.
 *
 *      Must be called single threaded, uses a shared global area.
 */

static void initio_read_eeprom(unsigned long base)
{
        u8 gctrl;

        i91unvramp = &i91unvram;
        /* Enable EEProm programming */
        gctrl = inb(base + TUL_GCTRL);
        outb(gctrl | TUL_GCTRL_EEPROM_BIT, base + TUL_GCTRL);
        if (initio_se2_rd_all(base) != 1) {
                initio_se2_update_all(base);    /* setup default pattern */
                initio_se2_rd_all(base);        /* load again  */
        }
        /* Disable EEProm programming */
        gctrl = inb(base + TUL_GCTRL);
        outb(gctrl & ~TUL_GCTRL_EEPROM_BIT, base + TUL_GCTRL);
}

/**
 *      initio_stop_bm          -       stop bus master
 *      @host: InitIO we are stopping
 *
 *      Stop any pending DMA operation, aborting the DMA if necessary
 */

static void initio_stop_bm(struct initio_host * host)
{

        if (inb(host->addr + TUL_XStatus) & XPEND) {    /* if DMA xfer is pending, abort DMA xfer */
                outb(TAX_X_ABT | TAX_X_CLR_FIFO, host->addr + TUL_XCmd);
                /* wait Abort DMA xfer done */
                while ((inb(host->addr + TUL_Int) & XABT) == 0)
                        cpu_relax();
        }
        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
}

/**
 *      initio_reset_scsi               -       Reset SCSI host controller
 *      @host: InitIO host to reset
 *      @seconds: Recovery time
 *
 *      Perform a full reset of the SCSI subsystem.
 */

static int initio_reset_scsi(struct initio_host * host, int seconds)
{
        outb(TSC_RST_BUS, host->addr + TUL_SCtrl0);

        while (!((host->jsint = inb(host->addr + TUL_SInt)) & TSS_SCSIRST_INT))
                cpu_relax();

        /* reset tulip chip */
        outb(0, host->addr + TUL_SSignal);

        /* Stall for a while, wait for target's firmware ready,make it 2 sec ! */
        /* SONY 5200 tape drive won't work if only stall for 1 sec */
        /* FIXME: this is a very long busy wait right now */
        initio_do_pause(seconds * HZ);

        inb(host->addr + TUL_SInt);
        return SCSI_RESET_SUCCESS;
}

/**
 *      initio_init             -       set up an InitIO host adapter
 *      @host: InitIO host adapter
 *      @bios_addr: BIOS address
 *
 *      Set up the host adapter and devices according to the configuration
 *      retrieved from the E2PROM.
 *
 *      Locking: Calls E2PROM layer code which is not re-enterable so must
 *      run single threaded for now.
 */

static void initio_init(struct initio_host * host, u8 *bios_addr)
{
        int i;
        u8 *flags;
        u8 *heads;

        /* Get E2Prom configuration */
        initio_read_eeprom(host->addr);
        if (i91unvramp->NVM_SCSIInfo[0].NVM_NumOfTarg == 8)
                host->max_tar = 8;
        else
                host->max_tar = 16;

        host->config = i91unvramp->NVM_SCSIInfo[0].NVM_ChConfig1;

        host->scsi_id = i91unvramp->NVM_SCSIInfo[0].NVM_ChSCSIID;
        host->idmask = ~(1 << host->scsi_id);

#ifdef CHK_PARITY
        /* Enable parity error response */
        outb(inb(host->addr + TUL_PCMD) | 0x40, host->addr + TUL_PCMD);
#endif

        /* Mask all the interrupt       */
        outb(0x1F, host->addr + TUL_Mask);

        initio_stop_bm(host);
        /* --- Initialize the tulip --- */
        outb(TSC_RST_CHIP, host->addr + TUL_SCtrl0);

        /* program HBA's SCSI ID        */
        outb(host->scsi_id << 4, host->addr + TUL_SScsiId);

        /* Enable Initiator Mode ,phase latch,alternate sync period mode,
           disable SCSI reset */
        if (host->config & HCC_EN_PAR)
                host->sconf1 = (TSC_INITDEFAULT | TSC_EN_SCSI_PAR);
        else
                host->sconf1 = (TSC_INITDEFAULT);
        outb(host->sconf1, host->addr + TUL_SConfig);

        /* Enable HW reselect */
        outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1);

        outb(0, host->addr + TUL_SPeriod);

        /* selection time out = 250 ms */
        outb(153, host->addr + TUL_STimeOut);

        /* Enable SCSI terminator */
        outb((host->config & (HCC_ACT_TERM1 | HCC_ACT_TERM2)),
                host->addr + TUL_XCtrl);
        outb(((host->config & HCC_AUTO_TERM) >> 4) |
                (inb(host->addr + TUL_GCTRL1) & 0xFE),
                host->addr + TUL_GCTRL1);

        for (i = 0,
             flags = & (i91unvramp->NVM_SCSIInfo[0].NVM_Targ0Config),
             heads = bios_addr + 0x180;
             i < host->max_tar;
             i++, flags++) {
                host->targets[i].flags = *flags & ~(TCF_SYNC_DONE | TCF_WDTR_DONE);
                if (host->targets[i].flags & TCF_EN_255)
                        host->targets[i].drv_flags = TCF_DRV_255_63;
                else
                        host->targets[i].drv_flags = 0;
                host->targets[i].js_period = 0;
                host->targets[i].sconfig0 = host->sconf1;
                host->targets[i].heads = *heads++;
                if (host->targets[i].heads == 255)
                        host->targets[i].drv_flags = TCF_DRV_255_63;
                else
                        host->targets[i].drv_flags = 0;
                host->targets[i].sectors = *heads++;
                host->targets[i].flags &= ~TCF_BUSY;
                host->act_tags[i] = 0;
                host->max_tags[i] = 0xFF;
        }                       /* for                          */
        printk("i91u: PCI Base=0x%04X, IRQ=%d, BIOS=0x%04X0, SCSI ID=%d\n",
               host->addr, host->pci_dev->irq,
               host->bios_addr, host->scsi_id);
        /* Reset SCSI Bus */
        if (host->config & HCC_SCSI_RESET) {
                printk(KERN_INFO "i91u: Reset SCSI Bus ... \n");
                initio_reset_scsi(host, 10);
        }
        outb(0x17, host->addr + TUL_SCFG1);
        outb(0xE9, host->addr + TUL_SIntEnable);
}

/**
 *      initio_alloc_scb                -       Allocate an SCB
 *      @host: InitIO host we are allocating for
 *
 *      Walk the SCB list for the controller and allocate a free SCB if
 *      one exists.
 */
static struct scsi_ctrl_blk *initio_alloc_scb(struct initio_host *host)
{
        struct scsi_ctrl_blk *scb;
        unsigned long flags;

        spin_lock_irqsave(&host->avail_lock, flags);
        if ((scb = host->first_avail) != NULL) {
#if DEBUG_QUEUE
                printk("find scb at %p\n", scb);
#endif
                if ((host->first_avail = scb->next) == NULL)
                        host->last_avail = NULL;
                scb->next = NULL;
                scb->status = SCB_RENT;
        }
        spin_unlock_irqrestore(&host->avail_lock, flags);
        return scb;
}

/**
 *      initio_release_scb              -       Release an SCB
 *      @host: InitIO host that owns the SCB
 *      @cmnd: SCB command block being returned
 *
 *      Return an allocated SCB to the host free list
 */

static void initio_release_scb(struct initio_host * host, struct scsi_ctrl_blk * cmnd)
{
        unsigned long flags;

#if DEBUG_QUEUE
        printk("Release SCB %p; ", cmnd);
#endif
        spin_lock_irqsave(&(host->avail_lock), flags);
        cmnd->srb = NULL;
        cmnd->status = 0;
        cmnd->next = NULL;
        if (host->last_avail != NULL) {
                host->last_avail->next = cmnd;
                host->last_avail = cmnd;
        } else {
                host->first_avail = cmnd;
                host->last_avail = cmnd;
        }
        spin_unlock_irqrestore(&(host->avail_lock), flags);
}

/***************************************************************************/
static void initio_append_pend_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
{

#if DEBUG_QUEUE
        printk("Append pend SCB %p; ", scbp);
#endif
        scbp->status = SCB_PEND;
        scbp->next = NULL;
        if (host->last_pending != NULL) {
                host->last_pending->next = scbp;
                host->last_pending = scbp;
        } else {
                host->first_pending = scbp;
                host->last_pending = scbp;
        }
}

/***************************************************************************/
static void initio_push_pend_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
{

#if DEBUG_QUEUE
        printk("Push pend SCB %p; ", scbp);
#endif
        scbp->status = SCB_PEND;
        if ((scbp->next = host->first_pending) != NULL) {
                host->first_pending = scbp;
        } else {
                host->first_pending = scbp;
                host->last_pending = scbp;
        }
}

static struct scsi_ctrl_blk *initio_find_first_pend_scb(struct initio_host * host)
{
        struct scsi_ctrl_blk *first;


        first = host->first_pending;
        while (first != NULL) {
                if (first->opcode != ExecSCSI)
                        return first;
                if (first->tagmsg == 0) {
                        if ((host->act_tags[first->target] == 0) &&
                            !(host->targets[first->target].flags & TCF_BUSY))
                                return first;
                } else {
                        if ((host->act_tags[first->target] >=
                          host->max_tags[first->target]) |
                            (host->targets[first->target].flags & TCF_BUSY)) {
                                first = first->next;
                                continue;
                        }
                        return first;
                }
                first = first->next;
        }
        return first;
}

static void initio_unlink_pend_scb(struct initio_host * host, struct scsi_ctrl_blk * scb)
{
        struct scsi_ctrl_blk *tmp, *prev;

#if DEBUG_QUEUE
        printk("unlink pend SCB %p; ", scb);
#endif

        prev = tmp = host->first_pending;
        while (tmp != NULL) {
                if (scb == tmp) {       /* Unlink this SCB              */
                        if (tmp == host->first_pending) {
                                if ((host->first_pending = tmp->next) == NULL)
                                        host->last_pending = NULL;
                        } else {
                                prev->next = tmp->next;
                                if (tmp == host->last_pending)
                                        host->last_pending = prev;
                        }
                        tmp->next = NULL;
                        break;
                }
                prev = tmp;
                tmp = tmp->next;
        }
}

static void initio_append_busy_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
{

#if DEBUG_QUEUE
        printk("append busy SCB %p; ", scbp);
#endif
        if (scbp->tagmsg)
                host->act_tags[scbp->target]++;
        else
                host->targets[scbp->target].flags |= TCF_BUSY;
        scbp->status = SCB_BUSY;
        scbp->next = NULL;
        if (host->last_busy != NULL) {
                host->last_busy->next = scbp;
                host->last_busy = scbp;
        } else {
                host->first_busy = scbp;
                host->last_busy = scbp;
        }
}

/***************************************************************************/
static struct scsi_ctrl_blk *initio_pop_busy_scb(struct initio_host * host)
{
        struct scsi_ctrl_blk *tmp;


        if ((tmp = host->first_busy) != NULL) {
                if ((host->first_busy = tmp->next) == NULL)
                        host->last_busy = NULL;
                tmp->next = NULL;
                if (tmp->tagmsg)
                        host->act_tags[tmp->target]--;
                else
                        host->targets[tmp->target].flags &= ~TCF_BUSY;
        }
#if DEBUG_QUEUE
        printk("Pop busy SCB %p; ", tmp);
#endif
        return tmp;
}

/***************************************************************************/
static void initio_unlink_busy_scb(struct initio_host * host, struct scsi_ctrl_blk * scb)
{
        struct scsi_ctrl_blk *tmp, *prev;

#if DEBUG_QUEUE
        printk("unlink busy SCB %p; ", scb);
#endif

        prev = tmp = host->first_busy;
        while (tmp != NULL) {
                if (scb == tmp) {       /* Unlink this SCB              */
                        if (tmp == host->first_busy) {
                                if ((host->first_busy = tmp->next) == NULL)
                                        host->last_busy = NULL;
                        } else {
                                prev->next = tmp->next;
                                if (tmp == host->last_busy)
                                        host->last_busy = prev;
                        }
                        tmp->next = NULL;
                        if (tmp->tagmsg)
                                host->act_tags[tmp->target]--;
                        else
                                host->targets[tmp->target].flags &= ~TCF_BUSY;
                        break;
                }
                prev = tmp;
                tmp = tmp->next;
        }
        return;
}

struct scsi_ctrl_blk *initio_find_busy_scb(struct initio_host * host, u16 tarlun)
{
        struct scsi_ctrl_blk *tmp;
        u16 scbp_tarlun;


        tmp = host->first_busy;
        while (tmp != NULL) {
                scbp_tarlun = (tmp->lun << 8) | (tmp->target);
                if (scbp_tarlun == tarlun) {    /* Unlink this SCB              */
                        break;
                }
                tmp = tmp->next;
        }
#if DEBUG_QUEUE
        printk("find busy SCB %p; ", tmp);
#endif
        return tmp;
}

static void initio_append_done_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
{
#if DEBUG_QUEUE
        printk("append done SCB %p; ", scbp);
#endif

        scbp->status = SCB_DONE;
        scbp->next = NULL;
        if (host->last_done != NULL) {
                host->last_done->next = scbp;
                host->last_done = scbp;
        } else {
                host->first_done = scbp;
                host->last_done = scbp;
        }
}

struct scsi_ctrl_blk *initio_find_done_scb(struct initio_host * host)
{
        struct scsi_ctrl_blk *tmp;

        if ((tmp = host->first_done) != NULL) {
                if ((host->first_done = tmp->next) == NULL)
                        host->last_done = NULL;
                tmp->next = NULL;
        }
#if DEBUG_QUEUE
        printk("find done SCB %p; ",tmp);
#endif
        return tmp;
}

static int initio_abort_srb(struct initio_host * host, struct scsi_cmnd *srbp)
{
        unsigned long flags;
        struct scsi_ctrl_blk *tmp, *prev;

        spin_lock_irqsave(&host->semaph_lock, flags);

        if ((host->semaph == 0) && (host->active == NULL)) {
                /* disable Jasmin SCSI Int        */
                outb(0x1F, host->addr + TUL_Mask);
                spin_unlock_irqrestore(&host->semaph_lock, flags);
                /* FIXME: synchronize_irq needed ? */
                tulip_main(host);
                spin_lock_irqsave(&host->semaph_lock, flags);
                host->semaph = 1;
                outb(0x0F, host->addr + TUL_Mask);
                spin_unlock_irqrestore(&host->semaph_lock, flags);
                return SCSI_ABORT_SNOOZE;
        }
        prev = tmp = host->first_pending;       /* Check Pend queue */
        while (tmp != NULL) {
                /* 07/27/98 */
                if (tmp->srb == srbp) {
                        if (tmp == host->active) {
                                spin_unlock_irqrestore(&host->semaph_lock, flags);
                                return SCSI_ABORT_BUSY;
                        } else if (tmp == host->first_pending) {
                                if ((host->first_pending = tmp->next) == NULL)
                                        host->last_pending = NULL;
                        } else {
                                prev->next = tmp->next;
                                if (tmp == host->last_pending)
                                        host->last_pending = prev;
                        }
                        tmp->hastat = HOST_ABORTED;
                        tmp->flags |= SCF_DONE;
                        if (tmp->flags & SCF_POST)
                                (*tmp->post) ((u8 *) host, (u8 *) tmp);
                        spin_unlock_irqrestore(&host->semaph_lock, flags);
                        return SCSI_ABORT_SUCCESS;
                }
                prev = tmp;
                tmp = tmp->next;
        }

        prev = tmp = host->first_busy;  /* Check Busy queue */
        while (tmp != NULL) {
                if (tmp->srb == srbp) {
                        if (tmp == host->active) {
                                spin_unlock_irqrestore(&host->semaph_lock, flags);
                                return SCSI_ABORT_BUSY;
                        } else if (tmp->tagmsg == 0) {
                                spin_unlock_irqrestore(&host->semaph_lock, flags);
                                return SCSI_ABORT_BUSY;
                        } else {
                                host->act_tags[tmp->target]--;
                                if (tmp == host->first_busy) {
                                        if ((host->first_busy = tmp->next) == NULL)
                                                host->last_busy = NULL;
                                } else {
                                        prev->next = tmp->next;
                                        if (tmp == host->last_busy)
                                                host->last_busy = prev;
                                }
                                tmp->next = NULL;


                                tmp->hastat = HOST_ABORTED;
                                tmp->flags |= SCF_DONE;
                                if (tmp->flags & SCF_POST)
                                        (*tmp->post) ((u8 *) host, (u8 *) tmp);
                                spin_unlock_irqrestore(&host->semaph_lock, flags);
                                return SCSI_ABORT_SUCCESS;
                        }
                }
                prev = tmp;
                tmp = tmp->next;
        }
        spin_unlock_irqrestore(&host->semaph_lock, flags);
        return SCSI_ABORT_NOT_RUNNING;
}

/***************************************************************************/
static int initio_bad_seq(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb;

        printk("initio_bad_seg c=%d\n", host->index);

        if ((scb = host->active) != NULL) {
                initio_unlink_busy_scb(host, scb);
                scb->hastat = HOST_BAD_PHAS;
                scb->tastat = 0;
                initio_append_done_scb(host, scb);
        }
        initio_stop_bm(host);
        initio_reset_scsi(host, 8);     /* 7/29/98 */
        return initio_post_scsi_rst(host);
}


/************************************************************************/
static void initio_exec_scb(struct initio_host * host, struct scsi_ctrl_blk * scb)
{
        unsigned long flags;

        scb->mode = 0;

        scb->sgidx = 0;
        scb->sgmax = scb->sglen;

        spin_lock_irqsave(&host->semaph_lock, flags);

        initio_append_pend_scb(host, scb);      /* Append this SCB to Pending queue */

/* VVVVV 07/21/98 */
        if (host->semaph == 1) {
                /* Disable Jasmin SCSI Int */
                outb(0x1F, host->addr + TUL_Mask);
                host->semaph = 0;
                spin_unlock_irqrestore(&host->semaph_lock, flags);

                tulip_main(host);

                spin_lock_irqsave(&host->semaph_lock, flags);
                host->semaph = 1;
                outb(0x0F, host->addr + TUL_Mask);
        }
        spin_unlock_irqrestore(&host->semaph_lock, flags);
        return;
}

/***************************************************************************/
static int initio_isr(struct initio_host * host)
{
        if (inb(host->addr + TUL_Int) & TSS_INT_PENDING) {
                if (host->semaph == 1) {
                        outb(0x1F, host->addr + TUL_Mask);
                        /* Disable Tulip SCSI Int */
                        host->semaph = 0;

                        tulip_main(host);

                        host->semaph = 1;
                        outb(0x0F, host->addr + TUL_Mask);
                        return 1;
                }
        }
        return 0;
}

static int tulip_main(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb;

        for (;;) {
                tulip_scsi(host);       /* Call tulip_scsi              */

                /* Walk the list of completed SCBs */
                while ((scb = initio_find_done_scb(host)) != NULL) {    /* find done entry */
                        if (scb->tastat == INI_QUEUE_FULL) {
                                host->max_tags[scb->target] =
                                    host->act_tags[scb->target] - 1;
                                scb->tastat = 0;
                                initio_append_pend_scb(host, scb);
                                continue;
                        }
                        if (!(scb->mode & SCM_RSENS)) {         /* not in auto req. sense mode */
                                if (scb->tastat == 2) {

                                        /* clr sync. nego flag */

                                        if (scb->flags & SCF_SENSE) {
                                                u8 len;
                                                len = scb->senselen;
                                                if (len == 0)
                                                        len = 1;
                                                scb->buflen = scb->senselen;
                                                scb->bufptr = scb->senseptr;
                                                scb->flags &= ~(SCF_SG | SCF_DIR);      /* for xfer_data_in */
                                                /* so, we won't report wrong direction in xfer_data_in,
                                                   and won't report HOST_DO_DU in state_6 */
                                                scb->mode = SCM_RSENS;
                                                scb->ident &= 0xBF;     /* Disable Disconnect */
                                                scb->tagmsg = 0;
                                                scb->tastat = 0;
                                                scb->cdblen = 6;
                                                scb->cdb[0] = SCSICMD_RequestSense;
                                                scb->cdb[1] = 0;
                                                scb->cdb[2] = 0;
                                                scb->cdb[3] = 0;
                                                scb->cdb[4] = len;
                                                scb->cdb[5] = 0;
                                                initio_push_pend_scb(host, scb);
                                                break;
                                        }
                                }
                        } else {        /* in request sense mode */

                                if (scb->tastat == 2) {         /* check contition status again after sending
                                                                           requset sense cmd 0x3 */
                                        scb->hastat = HOST_BAD_PHAS;
                                }
                                scb->tastat = 2;
                        }
                        scb->flags |= SCF_DONE;
                        if (scb->flags & SCF_POST) {
                                /* FIXME: only one post method and lose casts */
                                (*scb->post) ((u8 *) host, (u8 *) scb);
                        }
                }               /* while */
                /* find_active: */
                if (inb(host->addr + TUL_SStatus0) & TSS_INT_PENDING)
                        continue;
                if (host->active)       /* return to OS and wait for xfer_done_ISR/Selected_ISR */
                        return 1;       /* return to OS, enable interrupt */
                /* Check pending SCB            */
                if (initio_find_first_pend_scb(host) == NULL)
                        return 1;       /* return to OS, enable interrupt */
        }                       /* End of for loop */
        /* statement won't reach here */
}

static void tulip_scsi(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb;
        struct target_control *active_tc;

        /* make sure to service interrupt asap */
        if ((host->jsstatus0 = inb(host->addr + TUL_SStatus0)) & TSS_INT_PENDING) {
                host->phase = host->jsstatus0 & TSS_PH_MASK;
                host->jsstatus1 = inb(host->addr + TUL_SStatus1);
                host->jsint = inb(host->addr + TUL_SInt);
                if (host->jsint & TSS_SCSIRST_INT) {    /* SCSI bus reset detected      */
                        int_initio_scsi_rst(host);
                        return;
                }
                if (host->jsint & TSS_RESEL_INT) {      /* if selected/reselected interrupt */
                        if (int_initio_resel(host) == 0)
                                initio_next_state(host);
                        return;
                }
                if (host->jsint & TSS_SEL_TIMEOUT) {
                        int_initio_busfree(host);
                        return;
                }
                if (host->jsint & TSS_DISC_INT) {       /* BUS disconnection            */
                        int_initio_busfree(host);       /* unexpected bus free or sel timeout */
                        return;
                }
                if (host->jsint & (TSS_FUNC_COMP | TSS_BUS_SERV)) {     /* func complete or Bus service */
                        if (host->active)
                                initio_next_state(host);
                        return;
                }
        }
        if (host->active != NULL)
                return;

        if ((scb = initio_find_first_pend_scb(host)) == NULL)
                return;

        /* program HBA's SCSI ID & target SCSI ID */
        outb((host->scsi_id << 4) | (scb->target & 0x0F),
                host->addr + TUL_SScsiId);
        if (scb->opcode == ExecSCSI) {
                active_tc = &host->targets[scb->target];

                if (scb->tagmsg)
                        active_tc->drv_flags |= TCF_DRV_EN_TAG;
                else
                        active_tc->drv_flags &= ~TCF_DRV_EN_TAG;

                outb(active_tc->js_period, host->addr + TUL_SPeriod);
                if ((active_tc->flags & (TCF_WDTR_DONE | TCF_NO_WDTR)) == 0) {  /* do wdtr negotiation          */
                        initio_select_atn_stop(host, scb);
                } else {
                        if ((active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) == 0) {     /* do sync negotiation          */
                                initio_select_atn_stop(host, scb);
                        } else {
                                if (scb->tagmsg)
                                        initio_select_atn3(host, scb);
                                else
                                        initio_select_atn(host, scb);
                        }
                }
                if (scb->flags & SCF_POLL) {
                        while (wait_tulip(host) != -1) {
                                if (initio_next_state(host) == -1)
                                        break;
                        }
                }
        } else if (scb->opcode == BusDevRst) {
                initio_select_atn_stop(host, scb);
                scb->next_state = 8;
                if (scb->flags & SCF_POLL) {
                        while (wait_tulip(host) != -1) {
                                if (initio_next_state(host) == -1)
                                        break;
                        }
                }
        } else if (scb->opcode == AbortCmd) {
                if (initio_abort_srb(host, scb->srb) != 0) {
                        initio_unlink_pend_scb(host, scb);
                        initio_release_scb(host, scb);
                } else {
                        scb->opcode = BusDevRst;
                        initio_select_atn_stop(host, scb);
                        scb->next_state = 8;
                }
        } else {
                initio_unlink_pend_scb(host, scb);
                scb->hastat = 0x16;     /* bad command */
                initio_append_done_scb(host, scb);
        }
        return;
}

/**
 *      initio_next_state               -       Next SCSI state
 *      @host: InitIO host we are processing
 *
 *      Progress the active command block along the state machine
 *      until we hit a state which we must wait for activity to occur.
 *
 *      Returns zero or a negative code.
 */

static int initio_next_state(struct initio_host * host)
{
        int next;

        next = host->active->next_state;
        for (;;) {
                switch (next) {
                case 1:
                        next = initio_state_1(host);
                        break;
                case 2:
                        next = initio_state_2(host);
                        break;
                case 3:
                        next = initio_state_3(host);
                        break;
                case 4:
                        next = initio_state_4(host);
                        break;
                case 5:
                        next = initio_state_5(host);
                        break;
                case 6:
                        next = initio_state_6(host);
                        break;
                case 7:
                        next = initio_state_7(host);
                        break;
                case 8:
                        return initio_bus_device_reset(host);
                default:
                        return initio_bad_seq(host);
                }
                if (next <= 0)
                        return next;
        }
}


/**
 *      initio_state_1          -       SCSI state machine
 *      @host: InitIO host we are controlling
 *
 *      Perform SCSI state processing for Select/Attention/Stop
 */

static int initio_state_1(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;
        struct target_control *active_tc = host->active_tc;
#if DEBUG_STATE
        printk("-s1-");
#endif

        /* Move the SCB from pending to busy */
        initio_unlink_pend_scb(host, scb);
        initio_append_busy_scb(host, scb);

        outb(active_tc->sconfig0, host->addr + TUL_SConfig );
        /* ATN on */
        if (host->phase == MSG_OUT) {
                outb(TSC_EN_BUS_IN | TSC_HW_RESELECT, host->addr + TUL_SCtrl1);
                outb(scb->ident, host->addr + TUL_SFifo);

                if (scb->tagmsg) {
                        outb(scb->tagmsg, host->addr + TUL_SFifo);
                        outb(scb->tagid, host->addr + TUL_SFifo);
                }
                if ((active_tc->flags & (TCF_WDTR_DONE | TCF_NO_WDTR)) == 0) {
                        active_tc->flags |= TCF_WDTR_DONE;
                        outb(EXTENDED_MESSAGE, host->addr + TUL_SFifo);
                        outb(2, host->addr + TUL_SFifo);        /* Extended msg length */
                        outb(EXTENDED_SDTR, host->addr + TUL_SFifo);    /* Sync request */
                        outb(1, host->addr + TUL_SFifo);        /* Start from 16 bits */
                } else if ((active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) == 0) {
                        active_tc->flags |= TCF_SYNC_DONE;
                        outb(EXTENDED_MESSAGE, host->addr + TUL_SFifo);
                        outb(3, host->addr + TUL_SFifo);        /* extended msg length */
                        outb(EXTENDED_SDTR, host->addr + TUL_SFifo);    /* sync request */
                        outb(initio_rate_tbl[active_tc->flags & TCF_SCSI_RATE], host->addr + TUL_SFifo);
                        outb(MAX_OFFSET, host->addr + TUL_SFifo);       /* REQ/ACK offset */
                }
                outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                if (wait_tulip(host) == -1)
                        return -1;
        }
        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
        outb((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)), host->addr + TUL_SSignal);
        /* Into before CDB xfer */
        return 3;
}


/**
 *      initio_state_2          -       SCSI state machine
 *      @host: InitIO host we are controlling
 *
 * state after selection with attention
 * state after selection with attention3
 */

static int initio_state_2(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;
        struct target_control *active_tc = host->active_tc;
#if DEBUG_STATE
        printk("-s2-");
#endif

        initio_unlink_pend_scb(host, scb);
        initio_append_busy_scb(host, scb);

        outb(active_tc->sconfig0, host->addr + TUL_SConfig);

        if (host->jsstatus1 & TSS_CMD_PH_CMP)
                return 4;

        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
        outb((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)), host->addr + TUL_SSignal);
        /* Into before CDB xfer */
        return 3;
}

/**
 *      initio_state_3          -       SCSI state machine
 *      @host: InitIO host we are controlling
 *
 * state before CDB xfer is done
 */

static int initio_state_3(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;
        struct target_control *active_tc = host->active_tc;
        int i;

#if DEBUG_STATE
        printk("-s3-");
#endif
        for (;;) {
                switch (host->phase) {
                case CMD_OUT:   /* Command out phase            */
                        for (i = 0; i < (int) scb->cdblen; i++)
                                outb(scb->cdb[i], host->addr + TUL_SFifo);
                        outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                        if (wait_tulip(host) == -1)
                                return -1;
                        if (host->phase == CMD_OUT)
                                return initio_bad_seq(host);
                        return 4;

                case MSG_IN:    /* Message in phase             */
                        scb->next_state = 3;
                        if (initio_msgin(host) == -1)
                                return -1;
                        break;

                case STATUS_IN: /* Status phase                 */
                        if (initio_status_msg(host) == -1)
                                return -1;
                        break;

                case MSG_OUT:   /* Message out phase            */
                        if (active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) {
                                outb(NOP, host->addr + TUL_SFifo);              /* msg nop */
                                outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                                if (wait_tulip(host) == -1)
                                        return -1;
                        } else {
                                active_tc->flags |= TCF_SYNC_DONE;

                                outb(EXTENDED_MESSAGE, host->addr + TUL_SFifo);
                                outb(3, host->addr + TUL_SFifo);        /* ext. msg len */
                                outb(EXTENDED_SDTR, host->addr + TUL_SFifo);    /* sync request */
                                outb(initio_rate_tbl[active_tc->flags & TCF_SCSI_RATE], host->addr + TUL_SFifo);
                                outb(MAX_OFFSET, host->addr + TUL_SFifo);       /* REQ/ACK offset */
                                outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                                if (wait_tulip(host) == -1)
                                        return -1;
                                outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
                                outb(inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7), host->addr + TUL_SSignal);

                        }
                        break;
                default:
                        return initio_bad_seq(host);
                }
        }
}

/**
 *      initio_state_4          -       SCSI state machine
 *      @host: InitIO host we are controlling
 *
 *      SCSI state machine. State 4
 */

static int initio_state_4(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;

#if DEBUG_STATE
        printk("-s4-");
#endif
        if ((scb->flags & SCF_DIR) == SCF_NO_XF) {
                return 6;       /* Go to state 6 (After data) */
        }
        for (;;) {
                if (scb->buflen == 0)
                        return 6;

                switch (host->phase) {

                case STATUS_IN: /* Status phase                 */
                        if ((scb->flags & SCF_DIR) != 0)        /* if direction bit set then report data underrun */
                                scb->hastat = HOST_DO_DU;
                        if ((initio_status_msg(host)) == -1)
                                return -1;
                        break;

                case MSG_IN:    /* Message in phase             */
                        scb->next_state = 0x4;
                        if (initio_msgin(host) == -1)
                                return -1;
                        break;

                case MSG_OUT:   /* Message out phase            */
                        if (host->jsstatus0 & TSS_PAR_ERROR) {
                                scb->buflen = 0;
                                scb->hastat = HOST_DO_DU;
                                if (initio_msgout_ide(host) == -1)
                                        return -1;
                                return 6;
                        } else {
                                outb(NOP, host->addr + TUL_SFifo);              /* msg nop */
                                outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                                if (wait_tulip(host) == -1)
                                        return -1;
                        }
                        break;

                case DATA_IN:   /* Data in phase                */
                        return initio_xfer_data_in(host);

                case DATA_OUT:  /* Data out phase               */
                        return initio_xfer_data_out(host);

                default:
                        return initio_bad_seq(host);
                }
        }
}


/**
 *      initio_state_5          -       SCSI state machine
 *      @host: InitIO host we are controlling
 *
 *      State after dma xfer done or phase change before xfer done
 */

static int initio_state_5(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;
        long cnt, xcnt;         /* cannot use unsigned !! code: if (xcnt < 0) */

#if DEBUG_STATE
        printk("-s5-");
#endif
        /*------ get remaining count -------*/
        cnt = inl(host->addr + TUL_SCnt0) & 0x0FFFFFF;

        if (inb(host->addr + TUL_XCmd) & 0x20) {
                /* ----------------------- DATA_IN ----------------------------- */
                /* check scsi parity error */
                if (host->jsstatus0 & TSS_PAR_ERROR)
                        scb->hastat = HOST_DO_DU;
                if (inb(host->addr + TUL_XStatus) & XPEND) {    /* DMA xfer pending, Send STOP  */
                        /* tell Hardware  scsi xfer has been terminated */
                        outb(inb(host->addr + TUL_XCtrl) | 0x80, host->addr + TUL_XCtrl);
                        /* wait until DMA xfer not pending */
                        while (inb(host->addr + TUL_XStatus) & XPEND)
                                cpu_relax();
                }
        } else {
                /*-------- DATA OUT -----------*/
                if ((inb(host->addr + TUL_SStatus1) & TSS_XFER_CMP) == 0) {
                        if (host->active_tc->js_period & TSC_WIDE_SCSI)
                                cnt += (inb(host->addr + TUL_SFifoCnt) & 0x1F) << 1;
                        else
                                cnt += (inb(host->addr + TUL_SFifoCnt) & 0x1F);
                }
                if (inb(host->addr + TUL_XStatus) & XPEND) {    /* if DMA xfer is pending, abort DMA xfer */
                        outb(TAX_X_ABT, host->addr + TUL_XCmd);
                        /* wait Abort DMA xfer done */
                        while ((inb(host->addr + TUL_Int) & XABT) == 0)
                                cpu_relax();
                }
                if ((cnt == 1) && (host->phase == DATA_OUT)) {
                        outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                        if (wait_tulip(host) == -1)
                                return -1;
                        cnt = 0;
                } else {
                        if ((inb(host->addr + TUL_SStatus1) & TSS_XFER_CMP) == 0)
                                outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
                }
        }
        if (cnt == 0) {
                scb->buflen = 0;
                return 6;       /* After Data */
        }
        /* Update active data pointer */
        xcnt = (long) scb->buflen - cnt;        /* xcnt== bytes already xferred */
        scb->buflen = (u32) cnt;                /* cnt == bytes left to be xferred */
        if (scb->flags & SCF_SG) {
                struct sg_entry *sgp;
                unsigned long i;

                sgp = &scb->sglist[scb->sgidx];
                for (i = scb->sgidx; i < scb->sgmax; sgp++, i++) {
                        xcnt -= (long) sgp->len;
                        if (xcnt < 0) {         /* this sgp xfer half done */
                                xcnt += (long) sgp->len;        /* xcnt == bytes xferred in this sgp */
                                sgp->data += (u32) xcnt;        /* new ptr to be xfer */
                                sgp->len -= (u32) xcnt; /* new len to be xfer */
                                scb->bufptr += ((u32) (i - scb->sgidx) << 3);
                                /* new SG table ptr */
                                scb->sglen = (u8) (scb->sgmax - i);
                                /* new SG table len */
                                scb->sgidx = (u16) i;
                                /* for next disc and come in this loop */
                                return 4;       /* Go to state 4                */
                        }
                        /* else (xcnt >= 0 , i.e. this sgp already xferred */
                }               /* for */
                return 6;       /* Go to state 6                */
        } else {
                scb->bufptr += (u32) xcnt;
        }
        return 4;               /* Go to state 4                */
}

/**
 *      initio_state_6          -       SCSI state machine
 *      @host: InitIO host we are controlling
 *
 *      State after Data phase
 */

static int initio_state_6(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;

#if DEBUG_STATE
        printk("-s6-");
#endif
        for (;;) {
                switch (host->phase) {
                case STATUS_IN: /* Status phase                 */
                        if ((initio_status_msg(host)) == -1)
                                return -1;
                        break;

                case MSG_IN:    /* Message in phase             */
                        scb->next_state = 6;
                        if ((initio_msgin(host)) == -1)
                                return -1;
                        break;

                case MSG_OUT:   /* Message out phase            */
                        outb(NOP, host->addr + TUL_SFifo);              /* msg nop */
                        outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                        if (wait_tulip(host) == -1)
                                return -1;
                        break;

                case DATA_IN:   /* Data in phase                */
                        return initio_xpad_in(host);

                case DATA_OUT:  /* Data out phase               */
                        return initio_xpad_out(host);

                default:
                        return initio_bad_seq(host);
                }
        }
}

/**
 *      initio_state_7          -       SCSI state machine
 *      @host: InitIO host we are controlling
 *
 */

static int initio_state_7(struct initio_host * host)
{
        int cnt, i;

#if DEBUG_STATE
        printk("-s7-");
#endif
        /* flush SCSI FIFO */
        cnt = inb(host->addr + TUL_SFifoCnt) & 0x1F;
        if (cnt) {
                for (i = 0; i < cnt; i++)
                        inb(host->addr + TUL_SFifo);
        }
        switch (host->phase) {
        case DATA_IN:           /* Data in phase                */
        case DATA_OUT:          /* Data out phase               */
                return initio_bad_seq(host);
        default:
                return 6;       /* Go to state 6                */
        }
}

/**
 *      initio_xfer_data_in     -       Commence data input
 *      @host: InitIO host in use
 *
 *      Commence a block of data transfer. The transfer itself will
 *      be managed by the controller and we will get a completion (or
 *      failure) interrupt.
 */
static int initio_xfer_data_in(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;

        if ((scb->flags & SCF_DIR) == SCF_DOUT)
                return 6;       /* wrong direction */

        outl(scb->buflen, host->addr + TUL_SCnt0);
        outb(TSC_XF_DMA_IN, host->addr + TUL_SCmd);     /* 7/25/95 */

        if (scb->flags & SCF_SG) {      /* S/G xfer */
                outl(((u32) scb->sglen) << 3, host->addr + TUL_XCntH);
                outl(scb->bufptr, host->addr + TUL_XAddH);
                outb(TAX_SG_IN, host->addr + TUL_XCmd);
        } else {
                outl(scb->buflen, host->addr + TUL_XCntH);
                outl(scb->bufptr, host->addr + TUL_XAddH);
                outb(TAX_X_IN, host->addr + TUL_XCmd);
        }
        scb->next_state = 0x5;
        return 0;               /* return to OS, wait xfer done , let jas_isr come in */
}

/**
 *      initio_xfer_data_out    -       Commence data output
 *      @host: InitIO host in use
 *
 *      Commence a block of data transfer. The transfer itself will
 *      be managed by the controller and we will get a completion (or
 *      failure) interrupt.
 */

static int initio_xfer_data_out(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;

        if ((scb->flags & SCF_DIR) == SCF_DIN)
                return 6;       /* wrong direction */

        outl(scb->buflen, host->addr + TUL_SCnt0);
        outb(TSC_XF_DMA_OUT, host->addr + TUL_SCmd);

        if (scb->flags & SCF_SG) {      /* S/G xfer */
                outl(((u32) scb->sglen) << 3, host->addr + TUL_XCntH);
                outl(scb->bufptr, host->addr + TUL_XAddH);
                outb(TAX_SG_OUT, host->addr + TUL_XCmd);
        } else {
                outl(scb->buflen, host->addr + TUL_XCntH);
                outl(scb->bufptr, host->addr + TUL_XAddH);
                outb(TAX_X_OUT, host->addr + TUL_XCmd);
        }

        scb->next_state = 0x5;
        return 0;               /* return to OS, wait xfer done , let jas_isr come in */
}

int initio_xpad_in(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;
        struct target_control *active_tc = host->active_tc;

        if ((scb->flags & SCF_DIR) != SCF_NO_DCHK)
                scb->hastat = HOST_DO_DU;       /* over run             */
        for (;;) {
                if (active_tc->js_period & TSC_WIDE_SCSI)
                        outl(2, host->addr + TUL_SCnt0);
                else
                        outl(1, host->addr + TUL_SCnt0);

                outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
                if (wait_tulip(host) == -1)
                        return -1;
                if (host->phase != DATA_IN) {
                        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
                        return 6;
                }
                inb(host->addr + TUL_SFifo);
        }
}

int initio_xpad_out(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;
        struct target_control *active_tc = host->active_tc;

        if ((scb->flags & SCF_DIR) != SCF_NO_DCHK)
                scb->hastat = HOST_DO_DU;       /* over run             */
        for (;;) {
                if (active_tc->js_period & TSC_WIDE_SCSI)
                        outl(2, host->addr + TUL_SCnt0);
                else
                        outl(1, host->addr + TUL_SCnt0);

                outb(0, host->addr + TUL_SFifo);
                outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                if ((wait_tulip(host)) == -1)
                        return -1;
                if (host->phase != DATA_OUT) {  /* Disable wide CPU to allow read 16 bits */
                        outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1);
                        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
                        return 6;
                }
        }
}

int initio_status_msg(struct initio_host * host)
{                               /* status & MSG_IN */
        struct scsi_ctrl_blk *scb = host->active;
        u8 msg;

        outb(TSC_CMD_COMP, host->addr + TUL_SCmd);
        if (wait_tulip(host) == -1)
                return -1;

        /* get status */
        scb->tastat = inb(host->addr + TUL_SFifo);

        if (host->phase == MSG_OUT) {
                if (host->jsstatus0 & TSS_PAR_ERROR)
                        outb(MSG_PARITY_ERROR, host->addr + TUL_SFifo);
                else
                        outb(NOP, host->addr + TUL_SFifo);
                outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                return wait_tulip(host);
        }
        if (host->phase == MSG_IN) {
                msg = inb(host->addr + TUL_SFifo);
                if (host->jsstatus0 & TSS_PAR_ERROR) {  /* Parity error                 */
                        if ((initio_msgin_accept(host)) == -1)
                                return -1;
                        if (host->phase != MSG_OUT)
                                return initio_bad_seq(host);
                        outb(MSG_PARITY_ERROR, host->addr + TUL_SFifo);
                        outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                        return wait_tulip(host);
                }
                if (msg == 0) { /* Command complete             */

                        if ((scb->tastat & 0x18) == 0x10)       /* No link support              */
                                return initio_bad_seq(host);
                        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
                        outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
                        return initio_wait_done_disc(host);

                }
                if (msg == LINKED_CMD_COMPLETE ||
                    msg == LINKED_FLG_CMD_COMPLETE) {
                        if ((scb->tastat & 0x18) == 0x10)
                                return initio_msgin_accept(host);
                }
        }
        return initio_bad_seq(host);
}


/* scsi bus free */
int int_initio_busfree(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;

        if (scb != NULL) {
                if (scb->status & SCB_SELECT) {         /* selection timeout */
                        initio_unlink_pend_scb(host, scb);
                        scb->hastat = HOST_SEL_TOUT;
                        initio_append_done_scb(host, scb);
                } else {        /* Unexpected bus free          */
                        initio_unlink_busy_scb(host, scb);
                        scb->hastat = HOST_BUS_FREE;
                        initio_append_done_scb(host, scb);
                }
                host->active = NULL;
                host->active_tc = NULL;
        }
        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);          /* Flush SCSI FIFO  */
        outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
        outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1); /* Enable HW reselect       */
        return -1;
}


/**
 *      int_initio_scsi_rst     -       SCSI reset occurred
 *      @host: Host seeing the reset
 *
 *      A SCSI bus reset has occurred. Clean up any pending transfer
 *      the hardware is doing by DMA and then abort all active and
 *      disconnected commands. The mid layer should sort the rest out
 *      for us
 */

static int int_initio_scsi_rst(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb;
        int i;

        /* if DMA xfer is pending, abort DMA xfer */
        if (inb(host->addr + TUL_XStatus) & 0x01) {
                outb(TAX_X_ABT | TAX_X_CLR_FIFO, host->addr + TUL_XCmd);
                /* wait Abort DMA xfer done */
                while ((inb(host->addr + TUL_Int) & 0x04) == 0)
                        cpu_relax();
                outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
        }
        /* Abort all active & disconnected scb */
        while ((scb = initio_pop_busy_scb(host)) != NULL) {
                scb->hastat = HOST_BAD_PHAS;
                initio_append_done_scb(host, scb);
        }
        host->active = NULL;
        host->active_tc = NULL;

        /* clr sync nego. done flag */
        for (i = 0; i < host->max_tar; i++)
                host->targets[i].flags &= ~(TCF_SYNC_DONE | TCF_WDTR_DONE);
        return -1;
}

/**
 *      int_initio_resel        -       Reselection occurred
 *      @host: InitIO host adapter
 *
 *      A SCSI reselection event has been signalled and the interrupt
 *      is now being processed. Work out which command block needs attention
 *      and continue processing that command.
 */

int int_initio_resel(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb;
        struct target_control *active_tc;
        u8 tag, msg = 0;
        u8 tar, lun;

        if ((scb = host->active) != NULL) {
                /* FIXME: Why check and not just clear ? */
                if (scb->status & SCB_SELECT)           /* if waiting for selection complete */
                        scb->status &= ~SCB_SELECT;
                host->active = NULL;
        }
        /* --------- get target id---------------------- */
        tar = inb(host->addr + TUL_SBusId);
        /* ------ get LUN from Identify message----------- */
        lun = inb(host->addr + TUL_SIdent) & 0x0F;
        /* 07/22/98 from 0x1F -> 0x0F */
        active_tc = &host->targets[tar];
        host->active_tc = active_tc;
        outb(active_tc->sconfig0, host->addr + TUL_SConfig);
        outb(active_tc->js_period, host->addr + TUL_SPeriod);

        /* ------------- tag queueing ? ------------------- */
        if (active_tc->drv_flags & TCF_DRV_EN_TAG) {
                if ((initio_msgin_accept(host)) == -1)
                        return -1;
                if (host->phase != MSG_IN)
                        goto no_tag;
                outl(1, host->addr + TUL_SCnt0);
                outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
                if (wait_tulip(host) == -1)
                        return -1;
                msg = inb(host->addr + TUL_SFifo);      /* Read Tag Message    */

                if (msg < SIMPLE_QUEUE_TAG || msg > ORDERED_QUEUE_TAG)
                        /* Is simple Tag      */
                        goto no_tag;

                if (initio_msgin_accept(host) == -1)
                        return -1;

                if (host->phase != MSG_IN)
                        goto no_tag;

                outl(1, host->addr + TUL_SCnt0);
                outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
                if (wait_tulip(host) == -1)
                        return -1;
                tag = inb(host->addr + TUL_SFifo);      /* Read Tag ID       */
                scb = host->scb + tag;
                if (scb->target != tar || scb->lun != lun) {
                        return initio_msgout_abort_tag(host);
                }
                if (scb->status != SCB_BUSY) {  /* 03/24/95             */
                        return initio_msgout_abort_tag(host);
                }
                host->active = scb;
                if ((initio_msgin_accept(host)) == -1)
                        return -1;
        } else {                /* No tag               */
              no_tag:
                if ((scb = initio_find_busy_scb(host, tar | (lun << 8))) == NULL) {
                        return initio_msgout_abort_targ(host);
                }
                host->active = scb;
                if (!(active_tc->drv_flags & TCF_DRV_EN_TAG)) {
                        if ((initio_msgin_accept(host)) == -1)
                                return -1;
                }
        }
        return 0;
}

/**
 *      int_initio_bad_seq              -       out of phase
 *      @host: InitIO host flagging event
 *
 *      We have ended up out of phase somehow. Reset the host controller
 *      and throw all our toys out of the pram. Let the midlayer clean up
 */

static int int_initio_bad_seq(struct initio_host * host)
{                               /* target wrong phase           */
        struct scsi_ctrl_blk *scb;
        int i;

        initio_reset_scsi(host, 10);

        while ((scb = initio_pop_busy_scb(host)) != NULL) {
                scb->hastat = HOST_BAD_PHAS;
                initio_append_done_scb(host, scb);
        }
        for (i = 0; i < host->max_tar; i++)
                host->targets[i].flags &= ~(TCF_SYNC_DONE | TCF_WDTR_DONE);
        return -1;
}


/**
 *      initio_msgout_abort_targ                -       abort a tag
 *      @host: InitIO host
 *
 *      Abort when the target/lun does not match or when our SCB is not
 *      busy. Used by untagged commands.
 */

static int initio_msgout_abort_targ(struct initio_host * host)
{

        outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);
        if (initio_msgin_accept(host) == -1)
                return -1;
        if (host->phase != MSG_OUT)
                return initio_bad_seq(host);

        outb(ABORT_TASK_SET, host->addr + TUL_SFifo);
        outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);

        return initio_wait_disc(host);
}

/**
 *      initio_msgout_abort_tag         -       abort a tag
 *      @host: InitIO host
 *
 *      Abort when the target/lun does not match or when our SCB is not
 *      busy. Used for tagged commands.
 */

static int initio_msgout_abort_tag(struct initio_host * host)
{

        outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);
        if (initio_msgin_accept(host) == -1)
                return -1;
        if (host->phase != MSG_OUT)
                return initio_bad_seq(host);

        outb(ABORT_TASK, host->addr + TUL_SFifo);
        outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);

        return initio_wait_disc(host);

}

/**
 *      initio_msgin            -       Message in
 *      @host: InitIO Host
 *
 *      Process incoming message
 */
static int initio_msgin(struct initio_host * host)
{
        struct target_control *active_tc;

        for (;;) {
                outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);

                outl(1, host->addr + TUL_SCnt0);
                outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
                if (wait_tulip(host) == -1)
                        return -1;

                switch (inb(host->addr + TUL_SFifo)) {
                case DISCONNECT:        /* Disconnect msg */
                        outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
                        return initio_wait_disc(host);
                case SAVE_POINTERS:
                case RESTORE_POINTERS:
                case NOP:
                        initio_msgin_accept(host);
                        break;
                case MESSAGE_REJECT:    /* Clear ATN first              */
                        outb((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)),
                                host->addr + TUL_SSignal);
                        active_tc = host->active_tc;
                        if ((active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) == 0)       /* do sync nego */
                                outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN),
                                        host->addr + TUL_SSignal);
                        initio_msgin_accept(host);
                        break;
                case EXTENDED_MESSAGE:  /* extended msg */
                        initio_msgin_extend(host);
                        break;
                case IGNORE_WIDE_RESIDUE:
                        initio_msgin_accept(host);
                        break;
                case COMMAND_COMPLETE:
                        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
                        outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
                        return initio_wait_done_disc(host);
                default:
                        initio_msgout_reject(host);
                        break;
                }
                if (host->phase != MSG_IN)
                        return host->phase;
        }
        /* statement won't reach here */
}

static int initio_msgout_reject(struct initio_host * host)
{
        outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);

        if (initio_msgin_accept(host) == -1)
                return -1;

        if (host->phase == MSG_OUT) {
                outb(MESSAGE_REJECT, host->addr + TUL_SFifo);           /* Msg reject           */
                outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                return wait_tulip(host);
        }
        return host->phase;
}

static int initio_msgout_ide(struct initio_host * host)
{
        outb(INITIATOR_ERROR, host->addr + TUL_SFifo);          /* Initiator Detected Error */
        outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
        return wait_tulip(host);
}

static int initio_msgin_extend(struct initio_host * host)
{
        u8 len, idx;

        if (initio_msgin_accept(host) != MSG_IN)
                return host->phase;

        /* Get extended msg length      */
        outl(1, host->addr + TUL_SCnt0);
        outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
        if (wait_tulip(host) == -1)
                return -1;

        len = inb(host->addr + TUL_SFifo);
        host->msg[0] = len;
        for (idx = 1; len != 0; len--) {

                if ((initio_msgin_accept(host)) != MSG_IN)
                        return host->phase;
                outl(1, host->addr + TUL_SCnt0);
                outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
                if (wait_tulip(host) == -1)
                        return -1;
                host->msg[idx++] = inb(host->addr + TUL_SFifo);
        }
        if (host->msg[1] == 1) {                /* if it's synchronous data transfer request */
                u8 r;
                if (host->msg[0] != 3)  /* if length is not right */
                        return initio_msgout_reject(host);
                if (host->active_tc->flags & TCF_NO_SYNC_NEGO) {        /* Set OFFSET=0 to do async, nego back */
                        host->msg[3] = 0;
                } else {
                        if (initio_msgin_sync(host) == 0 &&
                            (host->active_tc->flags & TCF_SYNC_DONE)) {
                                initio_sync_done(host);
                                return initio_msgin_accept(host);
                        }
                }

                r = inb(host->addr + TUL_SSignal);
                outb((r & (TSC_SET_ACK | 7)) | TSC_SET_ATN,
                        host->addr + TUL_SSignal);
                if (initio_msgin_accept(host) != MSG_OUT)
                        return host->phase;
                /* sync msg out */
                outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);

                initio_sync_done(host);

                outb(EXTENDED_MESSAGE, host->addr + TUL_SFifo);
                outb(3, host->addr + TUL_SFifo);
                outb(EXTENDED_SDTR, host->addr + TUL_SFifo);
                outb(host->msg[2], host->addr + TUL_SFifo);
                outb(host->msg[3], host->addr + TUL_SFifo);
                outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
                return wait_tulip(host);
        }
        if (host->msg[0] != 2 || host->msg[1] != 3)
                return initio_msgout_reject(host);
        /* if it's WIDE DATA XFER REQ   */
        if (host->active_tc->flags & TCF_NO_WDTR) {
                host->msg[2] = 0;
        } else {
                if (host->msg[2] > 2)   /* > 32 bits            */
                        return initio_msgout_reject(host);
                if (host->msg[2] == 2) {                /* == 32                */
                        host->msg[2] = 1;
                } else {
                        if ((host->active_tc->flags & TCF_NO_WDTR) == 0) {
                                wdtr_done(host);
                                if ((host->active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) == 0)
                                        outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);
                                return initio_msgin_accept(host);
                        }
                }
        }
        outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);

        if (initio_msgin_accept(host) != MSG_OUT)
                return host->phase;
        /* WDTR msg out                 */
        outb(EXTENDED_MESSAGE, host->addr + TUL_SFifo);
        outb(2, host->addr + TUL_SFifo);
        outb(EXTENDED_WDTR, host->addr + TUL_SFifo);
        outb(host->msg[2], host->addr + TUL_SFifo);
        outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
        return wait_tulip(host);
}

static int initio_msgin_sync(struct initio_host * host)
{
        char default_period;

        default_period = initio_rate_tbl[host->active_tc->flags & TCF_SCSI_RATE];
        if (host->msg[3] > MAX_OFFSET) {
                host->msg[3] = MAX_OFFSET;
                if (host->msg[2] < default_period) {
                        host->msg[2] = default_period;
                        return 1;
                }
                if (host->msg[2] >= 59) /* Change to async              */
                        host->msg[3] = 0;
                return 1;
        }
        /* offset requests asynchronous transfers ? */
        if (host->msg[3] == 0) {
                return 0;
        }
        if (host->msg[2] < default_period) {
                host->msg[2] = default_period;
                return 1;
        }
        if (host->msg[2] >= 59) {
                host->msg[3] = 0;
                return 1;
        }
        return 0;
}

static int wdtr_done(struct initio_host * host)
{
        host->active_tc->flags &= ~TCF_SYNC_DONE;
        host->active_tc->flags |= TCF_WDTR_DONE;

        host->active_tc->js_period = 0;
        if (host->msg[2])       /* if 16 bit */
                host->active_tc->js_period |= TSC_WIDE_SCSI;
        host->active_tc->sconfig0 &= ~TSC_ALT_PERIOD;
        outb(host->active_tc->sconfig0, host->addr + TUL_SConfig);
        outb(host->active_tc->js_period, host->addr + TUL_SPeriod);

        return 1;
}

static int initio_sync_done(struct initio_host * host)
{
        int i;

        host->active_tc->flags |= TCF_SYNC_DONE;

        if (host->msg[3]) {
                host->active_tc->js_period |= host->msg[3];
                for (i = 0; i < 8; i++) {
                        if (initio_rate_tbl[i] >= host->msg[2]) /* pick the big one */
                                break;
                }
                host->active_tc->js_period |= (i << 4);
                host->active_tc->sconfig0 |= TSC_ALT_PERIOD;
        }
        outb(host->active_tc->sconfig0, host->addr + TUL_SConfig);
        outb(host->active_tc->js_period, host->addr + TUL_SPeriod);

        return -1;
}


static int initio_post_scsi_rst(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb;
        struct target_control *active_tc;
        int i;

        host->active = NULL;
        host->active_tc = NULL;
        host->flags = 0;

        while ((scb = initio_pop_busy_scb(host)) != NULL) {
                scb->hastat = HOST_BAD_PHAS;
                initio_append_done_scb(host, scb);
        }
        /* clear sync done flag         */
        active_tc = &host->targets[0];
        for (i = 0; i < host->max_tar; active_tc++, i++) {
                active_tc->flags &= ~(TCF_SYNC_DONE | TCF_WDTR_DONE);
                /* Initialize the sync. xfer register values to an asyn xfer */
                active_tc->js_period = 0;
                active_tc->sconfig0 = host->sconf1;
                host->act_tags[0] = 0;  /* 07/22/98 */
                host->targets[i].flags &= ~TCF_BUSY;    /* 07/22/98 */
        }                       /* for */

        return -1;
}

static void initio_select_atn_stop(struct initio_host * host, struct scsi_ctrl_blk * scb)
{
        scb->status |= SCB_SELECT;
        scb->next_state = 0x1;
        host->active = scb;
        host->active_tc = &host->targets[scb->target];
        outb(TSC_SELATNSTOP, host->addr + TUL_SCmd);
}


static void initio_select_atn(struct initio_host * host, struct scsi_ctrl_blk * scb)
{
        int i;

        scb->status |= SCB_SELECT;
        scb->next_state = 0x2;

        outb(scb->ident, host->addr + TUL_SFifo);
        for (i = 0; i < (int) scb->cdblen; i++)
                outb(scb->cdb[i], host->addr + TUL_SFifo);
        host->active_tc = &host->targets[scb->target];
        host->active = scb;
        outb(TSC_SEL_ATN, host->addr + TUL_SCmd);
}

static void initio_select_atn3(struct initio_host * host, struct scsi_ctrl_blk * scb)
{
        int i;

        scb->status |= SCB_SELECT;
        scb->next_state = 0x2;

        outb(scb->ident, host->addr + TUL_SFifo);
        outb(scb->tagmsg, host->addr + TUL_SFifo);
        outb(scb->tagid, host->addr + TUL_SFifo);
        for (i = 0; i < scb->cdblen; i++)
                outb(scb->cdb[i], host->addr + TUL_SFifo);
        host->active_tc = &host->targets[scb->target];
        host->active = scb;
        outb(TSC_SEL_ATN3, host->addr + TUL_SCmd);
}

/**
 *      initio_bus_device_reset -        SCSI Bus Device Reset
 *      @host: InitIO host to reset
 *
 *      Perform a device reset and abort all pending SCBs for the
 *      victim device
 */
int initio_bus_device_reset(struct initio_host * host)
{
        struct scsi_ctrl_blk *scb = host->active;
        struct target_control *active_tc = host->active_tc;
        struct scsi_ctrl_blk *tmp, *prev;
        u8 tar;

        if (host->phase != MSG_OUT)
                return int_initio_bad_seq(host);        /* Unexpected phase */

        initio_unlink_pend_scb(host, scb);
        initio_release_scb(host, scb);


        tar = scb->target;      /* target                       */
        active_tc->flags &= ~(TCF_SYNC_DONE | TCF_WDTR_DONE | TCF_BUSY);
        /* clr sync. nego & WDTR flags  07/22/98 */

        /* abort all SCB with same target */
        prev = tmp = host->first_busy;  /* Check Busy queue */
        while (tmp != NULL) {
                if (tmp->target == tar) {
                        /* unlink it */
                        if (tmp == host->first_busy) {
                                if ((host->first_busy = tmp->next) == NULL)
                                        host->last_busy = NULL;
                        } else {
                                prev->next = tmp->next;
                                if (tmp == host->last_busy)
                                        host->last_busy = prev;
                        }
                        tmp->hastat = HOST_ABORTED;
                        initio_append_done_scb(host, tmp);
                }
                /* Previous haven't change      */
                else {
                        prev = tmp;
                }
                tmp = tmp->next;
        }
        outb(TARGET_RESET, host->addr + TUL_SFifo);
        outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
        return initio_wait_disc(host);

}

static int initio_msgin_accept(struct initio_host * host)
{
        outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
        return wait_tulip(host);
}

static int wait_tulip(struct initio_host * host)
{

        while (!((host->jsstatus0 = inb(host->addr + TUL_SStatus0))
                 & TSS_INT_PENDING))
                        cpu_relax();

        host->jsint = inb(host->addr + TUL_SInt);
        host->phase = host->jsstatus0 & TSS_PH_MASK;
        host->jsstatus1 = inb(host->addr + TUL_SStatus1);

        if (host->jsint & TSS_RESEL_INT)        /* if SCSI bus reset detected */
                return int_initio_resel(host);
        if (host->jsint & TSS_SEL_TIMEOUT)      /* if selected/reselected timeout interrupt */
                return int_initio_busfree(host);
        if (host->jsint & TSS_SCSIRST_INT)      /* if SCSI bus reset detected   */
                return int_initio_scsi_rst(host);

        if (host->jsint & TSS_DISC_INT) {       /* BUS disconnection            */
                if (host->flags & HCF_EXPECT_DONE_DISC) {
                        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0); /* Flush SCSI FIFO */
                        initio_unlink_busy_scb(host, host->active);
                        host->active->hastat = 0;
                        initio_append_done_scb(host, host->active);
                        host->active = NULL;
                        host->active_tc = NULL;
                        host->flags &= ~HCF_EXPECT_DONE_DISC;
                        outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
                        outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1); /* Enable HW reselect */
                        return -1;
                }
                if (host->flags & HCF_EXPECT_DISC) {
                        outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0); /* Flush SCSI FIFO */
                        host->active = NULL;
                        host->active_tc = NULL;
                        host->flags &= ~HCF_EXPECT_DISC;
                        outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
                        outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1); /* Enable HW reselect */
                        return -1;
                }
                return int_initio_busfree(host);
        }
        /* The old code really does the below. Can probably be removed */
        if (host->jsint & (TSS_FUNC_COMP | TSS_BUS_SERV))
                return host->phase;
        return host->phase;
}

static int initio_wait_disc(struct initio_host * host)
{
        while (!((host->jsstatus0 = inb(host->addr + TUL_SStatus0)) & TSS_INT_PENDING))
                cpu_relax();

        host->jsint = inb(host->addr + TUL_SInt);

        if (host->jsint & TSS_SCSIRST_INT)      /* if SCSI bus reset detected */
                return int_initio_scsi_rst(host);
        if (host->jsint & TSS_DISC_INT) {       /* BUS disconnection */
                outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0); /* Flush SCSI FIFO */
                outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
                outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1); /* Enable HW reselect */
                host->active = NULL;
                return -1;
        }
        return initio_bad_seq(host);
}

static int initio_wait_done_disc(struct initio_host * host)
{
        while (!((host->jsstatus0 = inb(host->addr + TUL_SStatus0))
                 & TSS_INT_PENDING))
                 cpu_relax();

        host->jsint = inb(host->addr + TUL_SInt);

        if (host->jsint & TSS_SCSIRST_INT)      /* if SCSI bus reset detected */
                return int_initio_scsi_rst(host);
        if (host->jsint & TSS_DISC_INT) {       /* BUS disconnection */
                outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);          /* Flush SCSI FIFO */
                outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
                outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1);         /* Enable HW reselect */
                initio_unlink_busy_scb(host, host->active);

                initio_append_done_scb(host, host->active);
                host->active = NULL;
                return -1;
        }
        return initio_bad_seq(host);
}

/**
 *      i91u_intr               -       IRQ handler
 *      @irqno: IRQ number
 *      @dev_id: IRQ identifier
 *
 *      Take the relevant locks and then invoke the actual isr processing
 *      code under the lock.
 */

static irqreturn_t i91u_intr(int irqno, void *dev_id)
{
        struct Scsi_Host *dev = dev_id;
        unsigned long flags;
        int r;
        
        spin_lock_irqsave(dev->host_lock, flags);
        r = initio_isr((struct initio_host *)dev->hostdata);
        spin_unlock_irqrestore(dev->host_lock, flags);
        if (r)
                return IRQ_HANDLED;
        else
                return IRQ_NONE;
}


/**
 *      initio_build_scb                -       Build the mappings and SCB
 *      @host: InitIO host taking the command
 *      @cblk: Firmware command block
 *      @cmnd: SCSI midlayer command block
 *
 *      Translate the abstract SCSI command into a firmware command block
 *      suitable for feeding to the InitIO host controller. This also requires
 *      we build the scatter gather lists and ensure they are mapped properly.
 */

static void initio_build_scb(struct initio_host * host, struct scsi_ctrl_blk * cblk, struct scsi_cmnd * cmnd)
{                               /* Create corresponding SCB     */
        struct scatterlist *sglist;
        struct sg_entry *sg;            /* Pointer to SG list           */
        int i, nseg;
        long total_len;
        dma_addr_t dma_addr;

        /* Fill in the command headers */
        cblk->post = i91uSCBPost;       /* i91u's callback routine      */
        cblk->srb = cmnd;
        cblk->opcode = ExecSCSI;
        cblk->flags = SCF_POST; /* After SCSI done, call post routine */
        cblk->target = cmnd->device->id;
        cblk->lun = cmnd->device->lun;
        cblk->ident = cmnd->device->lun | DISC_ALLOW;

        cblk->flags |= SCF_SENSE;       /* Turn on auto request sense   */

        /* Map the sense buffer into bus memory */
        dma_addr = dma_map_single(&host->pci_dev->dev, cmnd->sense_buffer,
                                  SENSE_SIZE, DMA_FROM_DEVICE);
        cblk->senseptr = (u32)dma_addr;
        cblk->senselen = SENSE_SIZE;
        initio_priv(cmnd)->sense_dma_addr = dma_addr;
        cblk->cdblen = cmnd->cmd_len;

        /* Clear the returned status */
        cblk->hastat = 0;
        cblk->tastat = 0;
        /* Command the command */
        memcpy(cblk->cdb, cmnd->cmnd, cmnd->cmd_len);

        /* Set up tags */
        if (cmnd->device->tagged_supported) {   /* Tag Support                  */
                cblk->tagmsg = SIMPLE_QUEUE_TAG;        /* Do simple tag only   */
        } else {
                cblk->tagmsg = 0;       /* No tag support               */
        }

        /* todo handle map_sg error */
        nseg = scsi_dma_map(cmnd);
        BUG_ON(nseg < 0);
        if (nseg) {
                dma_addr = dma_map_single(&host->pci_dev->dev, &cblk->sglist[0],
                                          sizeof(struct sg_entry) * TOTAL_SG_ENTRY,
                                          DMA_BIDIRECTIONAL);
                cblk->bufptr = (u32)dma_addr;
                initio_priv(cmnd)->sglist_dma_addr = dma_addr;

                cblk->sglen = nseg;

                cblk->flags |= SCF_SG;  /* Turn on SG list flag       */
                total_len = 0;
                sg = &cblk->sglist[0];
                scsi_for_each_sg(cmnd, sglist, cblk->sglen, i) {
                        sg->data = cpu_to_le32((u32)sg_dma_address(sglist));
                        sg->len = cpu_to_le32((u32)sg_dma_len(sglist));
                        total_len += sg_dma_len(sglist);
                        ++sg;
                }

                cblk->buflen = (scsi_bufflen(cmnd) > total_len) ?
                        total_len : scsi_bufflen(cmnd);
        } else {        /* No data transfer required */
                cblk->buflen = 0;
                cblk->sglen = 0;
        }
}

/**
 *      i91u_queuecommand_lck   -       Queue a new command if possible
 *      @cmd: SCSI command block from the mid layer
 *
 *      Attempts to queue a new command with the host adapter. Will return
 *      zero if successful or indicate a host busy condition if not (which
 *      will cause the mid layer to call us again later with the command)
 */
static enum scsi_qc_status i91u_queuecommand_lck(struct scsi_cmnd *cmd)
{
        struct initio_host *host = (struct initio_host *) cmd->device->host->hostdata;
        struct scsi_ctrl_blk *cmnd;

        cmnd = initio_alloc_scb(host);
        if (!cmnd)
                return SCSI_MLQUEUE_HOST_BUSY;

        initio_build_scb(host, cmnd, cmd);
        initio_exec_scb(host, cmnd);
        return 0;
}

static DEF_SCSI_QCMD(i91u_queuecommand)

/**
 *      i91u_bus_reset          -       reset the SCSI bus
 *      @cmnd: Command block we want to trigger the reset for
 *
 *      Initiate a SCSI bus reset sequence
 */

static int i91u_bus_reset(struct scsi_cmnd * cmnd)
{
        struct initio_host *host;

        host = (struct initio_host *) cmnd->device->host->hostdata;

        spin_lock_irq(cmnd->device->host->host_lock);
        initio_reset_scsi(host, 0);
        spin_unlock_irq(cmnd->device->host->host_lock);

        return SUCCESS;
}

/**
 *      i91u_biosparam                  -       return the "logical geometry
 *      @sdev: SCSI device
 *      @unused: Matching gendisk
 *      @capacity: Sector size of drive
 *      @info_array: Return space for BIOS geometry
 *
 *      Map the device geometry in a manner compatible with the host
 *      controller BIOS behaviour.
 *
 *      FIXME: limited to 2^32 sector devices.
 */

static int i91u_biosparam(struct scsi_device *sdev, struct gendisk *unused,
                sector_t capacity, int *info_array)
{
        struct initio_host *host;               /* Point to Host adapter control block */
        struct target_control *tc;

        host = (struct initio_host *) sdev->host->hostdata;
        tc = &host->targets[sdev->id];

        if (tc->heads) {
                info_array[0] = tc->heads;
                info_array[1] = tc->sectors;
                info_array[2] = (unsigned long)capacity / tc->heads / tc->sectors;
        } else {
                if (tc->drv_flags & TCF_DRV_255_63) {
                        info_array[0] = 255;
                        info_array[1] = 63;
                        info_array[2] = (unsigned long)capacity / 255 / 63;
                } else {
                        info_array[0] = 64;
                        info_array[1] = 32;
                        info_array[2] = (unsigned long)capacity >> 11;
                }
        }

#if defined(DEBUG_BIOSPARAM)
        if (i91u_debug & debug_biosparam) {
                printk("bios geometry: head=%d, sec=%d, cyl=%d\n",
                       info_array[0], info_array[1], info_array[2]);
                printk("WARNING: check, if the bios geometry is correct.\n");
        }
#endif

        return 0;
}

/**
 *      i91u_unmap_scb          -       Unmap a command
 *      @pci_dev: PCI device the command is for
 *      @cmnd: The command itself
 *
 *      Unmap any PCI mapping/IOMMU resources allocated when the command
 *      was mapped originally as part of initio_build_scb
 */

static void i91u_unmap_scb(struct pci_dev *pci_dev, struct scsi_cmnd *cmnd)
{
        /* auto sense buffer */
        if (initio_priv(cmnd)->sense_dma_addr) {
                dma_unmap_single(&pci_dev->dev,
                                 initio_priv(cmnd)->sense_dma_addr,
                                 SENSE_SIZE, DMA_FROM_DEVICE);
                initio_priv(cmnd)->sense_dma_addr = 0;
        }

        /* request buffer */
        if (scsi_sg_count(cmnd)) {
                dma_unmap_single(&pci_dev->dev,
                                 initio_priv(cmnd)->sglist_dma_addr,
                                 sizeof(struct sg_entry) * TOTAL_SG_ENTRY,
                                 DMA_BIDIRECTIONAL);

                scsi_dma_unmap(cmnd);
        }
}

/*
 *      i91uSCBPost             -       SCSI callback
 *
 *      This is callback routine be called when tulip finish one
 *      SCSI command.
 */

static void i91uSCBPost(u8 * host_mem, u8 * cblk_mem)
{
        struct scsi_cmnd *cmnd; /* Pointer to SCSI request block */
        struct initio_host *host;
        struct scsi_ctrl_blk *cblk;

        host = (struct initio_host *) host_mem;
        cblk = (struct scsi_ctrl_blk *) cblk_mem;
        if ((cmnd = cblk->srb) == NULL) {
                printk(KERN_ERR "i91uSCBPost: SRB pointer is empty\n");
                WARN_ON(1);
                initio_release_scb(host, cblk); /* Release SCB for current channel */
                return;
        }

        /*
         *      Remap the firmware error status into a mid layer one
         */
        switch (cblk->hastat) {
        case 0x0:
        case 0xa:               /* Linked command complete without error and linked normally */
        case 0xb:               /* Linked command complete without error interrupt generated */
                cblk->hastat = 0;
                break;

        case 0x11:              /* Selection time out-The initiator selection or target
                                   reselection was not complete within the SCSI Time out period */
                cblk->hastat = DID_TIME_OUT;
                break;

        case 0x14:              /* Target bus phase sequence failure-An invalid bus phase or bus
                                   phase sequence was requested by the target. The host adapter
                                   will generate a SCSI Reset Condition, notifying the host with
                                   a SCRD interrupt */
                cblk->hastat = DID_RESET;
                break;

        case 0x1a:              /* SCB Aborted. 07/21/98 */
                cblk->hastat = DID_ABORT;
                break;

        case 0x12:              /* Data overrun/underrun-The target attempted to transfer more data
                                   than was allocated by the Data Length field or the sum of the
                                   Scatter / Gather Data Length fields. */
        case 0x13:              /* Unexpected bus free-The target dropped the SCSI BSY at an unexpected time. */
        case 0x16:              /* Invalid SCB Operation Code. */

        default:
                printk("ini9100u: %x %x\n", cblk->hastat, cblk->tastat);
                cblk->hastat = DID_ERROR;       /* Couldn't find any better */
                break;
        }

        cmnd->result = cblk->tastat | (cblk->hastat << 16);
        i91u_unmap_scb(host->pci_dev, cmnd);
        scsi_done(cmnd);        /* Notify system DONE           */
        initio_release_scb(host, cblk); /* Release SCB for current channel */
}

static const struct scsi_host_template initio_template = {
        .proc_name              = "INI9100U",
        .name                   = "Initio INI-9X00U/UW SCSI device driver",
        .queuecommand           = i91u_queuecommand,
        .eh_bus_reset_handler   = i91u_bus_reset,
        .bios_param             = i91u_biosparam,
        .can_queue              = MAX_TARGETS * i91u_MAXQUEUE,
        .this_id                = 1,
        .sg_tablesize           = SG_ALL,
        .cmd_size               = sizeof(struct initio_cmd_priv),
};

static int initio_probe_one(struct pci_dev *pdev,
        const struct pci_device_id *id)
{
        struct Scsi_Host *shost;
        struct initio_host *host;
        u32 reg;
        u16 bios_seg;
        struct scsi_ctrl_blk *scb, *tmp, *prev = NULL /* silence gcc */;
        int num_scb, i, error;

        error = pci_enable_device(pdev);
        if (error)
                return error;

        pci_read_config_dword(pdev, 0x44, (u32 *) & reg);
        bios_seg = (u16) (reg & 0xFF);
        if (((reg & 0xFF00) >> 8) == 0xFF)
                reg = 0;
        bios_seg = (bios_seg << 8) + ((u16) ((reg & 0xFF00) >> 8));

        if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
                printk(KERN_WARNING  "i91u: Could not set 32 bit DMA mask\n");
                error = -ENODEV;
                goto out_disable_device;
        }
        shost = scsi_host_alloc(&initio_template, sizeof(struct initio_host));
        if (!shost) {
                printk(KERN_WARNING "initio: Could not allocate host structure.\n");
                error = -ENOMEM;
                goto out_disable_device;
        }
        host = (struct initio_host *)shost->hostdata;
        memset(host, 0, sizeof(struct initio_host));
        host->addr = pci_resource_start(pdev, 0);
        host->bios_addr = bios_seg;

        if (!request_region(host->addr, 256, "i91u")) {
                printk(KERN_WARNING "initio: I/O port range 0x%x is busy.\n", host->addr);
                error = -ENODEV;
                goto out_host_put;
        }

        if (initio_tag_enable)  /* 1.01i */
                num_scb = MAX_TARGETS * i91u_MAXQUEUE;
        else
                num_scb = MAX_TARGETS + 3;      /* 1-tape, 1-CD_ROM, 1- extra */

        for (; num_scb >= MAX_TARGETS + 3; num_scb--) {
                i = num_scb * sizeof(struct scsi_ctrl_blk);
                scb = kzalloc(i, GFP_KERNEL);
                if (scb)
                        break;
        }

        if (!scb) {
                printk(KERN_WARNING "initio: Cannot allocate SCB array.\n");
                error = -ENOMEM;
                goto out_release_region;
        }

        host->pci_dev = pdev;

        host->semaph = 1;
        spin_lock_init(&host->semaph_lock);
        host->num_scbs = num_scb;
        host->scb = scb;
        host->next_pending = scb;
        host->next_avail = scb;
        for (i = 0, tmp = scb; i < num_scb; i++, tmp++) {
                tmp->tagid = i;
                if (i != 0)
                        prev->next = tmp;
                prev = tmp;
        }
        prev->next = NULL;
        host->scb_end = tmp;
        host->first_avail = scb;
        host->last_avail = prev;
        spin_lock_init(&host->avail_lock);

        initio_init(host, phys_to_virt(((u32)bios_seg << 4)));

        host->jsstatus0 = 0;

        shost->io_port = host->addr;
        shost->n_io_port = 0xff;
        shost->can_queue = num_scb;             /* 03/05/98                      */
        shost->unique_id = host->addr;
        shost->max_id = host->max_tar;
        shost->max_lun = 32;    /* 10/21/97                     */
        shost->irq = pdev->irq;
        shost->this_id = host->scsi_id; /* Assign HCS index           */
        shost->base = host->addr;
        shost->sg_tablesize = TOTAL_SG_ENTRY;

        error = request_irq(pdev->irq, i91u_intr, IRQF_SHARED, "i91u", shost);
        if (error < 0) {
                printk(KERN_WARNING "initio: Unable to request IRQ %d\n", pdev->irq);
                goto out_free_scbs;
        }

        pci_set_drvdata(pdev, shost);

        error = scsi_add_host(shost, &pdev->dev);
        if (error)
                goto out_free_irq;
        scsi_scan_host(shost);
        return 0;
out_free_irq:
        free_irq(pdev->irq, shost);
out_free_scbs:
        kfree(host->scb);
out_release_region:
        release_region(host->addr, 256);
out_host_put:
        scsi_host_put(shost);
out_disable_device:
        pci_disable_device(pdev);
        return error;
}

/**
 *      initio_remove_one       -       control shutdown
 *      @pdev:  PCI device being released
 *
 *      Release the resources assigned to this adapter after it has
 *      finished being used.
 */

static void initio_remove_one(struct pci_dev *pdev)
{
        struct Scsi_Host *host = pci_get_drvdata(pdev);
        struct initio_host *s = (struct initio_host *)host->hostdata;
        scsi_remove_host(host);
        free_irq(pdev->irq, host);
        release_region(s->addr, 256);
        scsi_host_put(host);
        pci_disable_device(pdev);
}

MODULE_LICENSE("GPL");

static const struct pci_device_id initio_pci_tbl[] = {
        {PCI_VENDOR_ID_INIT, 0x9500, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_INIT, 0x9400, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_INIT, 0x9401, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_INIT, 0x0002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_DOMEX, 0x0002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0,}
};
MODULE_DEVICE_TABLE(pci, initio_pci_tbl);

static struct pci_driver initio_pci_driver = {
        .name           = "initio",
        .id_table       = initio_pci_tbl,
        .probe          = initio_probe_one,
        .remove         = initio_remove_one,
};
module_pci_driver(initio_pci_driver);

MODULE_DESCRIPTION("Initio INI-9X00U/UW SCSI device driver");
MODULE_AUTHOR("Initio Corporation");
MODULE_LICENSE("GPL");