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initio.c

/**************************************************************************
 * 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 <alan@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *************************************************************************
 *
 * 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"

#define I950_DEVICE_ID  0x9500      /* Initio's inic-950 product ID   */
#define I940_DEVICE_ID  0x9400      /* Initio's inic-940 product ID   */
#define I935_DEVICE_ID  0x9401      /* Initio's inic-935 product ID   */
#define I920_DEVICE_ID  0x0002      /* Initio's other product ID      */

#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);

/* PCI Devices supported by this driver */
static struct pci_device_id i91u_pci_devices[] = {
      { PCI_VENDOR_ID_INIT,  I950_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      { PCI_VENDOR_ID_INIT,  I940_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      { PCI_VENDOR_ID_INIT,  I935_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      { PCI_VENDOR_ID_INIT,  I920_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      { PCI_VENDOR_ID_DOMEX, I920_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      { }
};
MODULE_DEVICE_TABLE(pci, i91u_pci_devices);

#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 devide 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 rb;
      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 ((rb = 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 neccessary
 */

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
 *    @num_scbs: Number of SCBS
 *    @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, *prev;
      u16 scbp_tarlun;


      prev = tmp = host->first_busy;
      while (tmp != NULL) {
            scbp_tarlun = (tmp->lun << 8) | (tmp->target);
            if (scbp_tarlun == tarlun) {  /* Unlink this SCB              */
                  break;
            }
            prev = tmp;
            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 ((scb = host->active) != NULL)
                        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(MSG_EXTEND, host->addr + TUL_SFifo);
                  outb(2, host->addr + TUL_SFifo);    /* Extended msg length */
                  outb(3, 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(MSG_EXTEND, host->addr + TUL_SFifo);
                  outb(3, host->addr + TUL_SFifo);    /* extended msg length */
                  outb(1, 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(MSG_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(MSG_EXTEND, host->addr + TUL_SFifo);
                        outb(3, host->addr + TUL_SFifo);    /* ext. msg len */
                        outb(1, 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(MSG_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(MSG_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
 *
 */

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, host->addr + TUL_SFifo);
            else
                  outb(MSG_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, 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 == MSG_LINK_COMP || msg == MSG_LINK_FLAG) {
                  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_scsi_resel   -     Reselection occured
 *    @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 < MSG_STAG || msg > MSG_OTAG)           /* 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(MSG_ABORT, 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(MSG_ABORT_TAG, 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 MSG_DISC:    /* Disconnect msg */
                  outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
                  return initio_wait_disc(host);
            case MSG_SDP:
            case MSG_RESTORE:
            case MSG_NOP:
                  initio_msgin_accept(host);
                  break;
            case MSG_REJ:     /* 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 MSG_EXTEND:  /* extended msg */
                  initio_msgin_extend(host);
                  break;
            case MSG_IGNOREWIDE:
                  initio_msgin_accept(host);
                  break;
            case MSG_COMP:
                  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(MSG_REJ, 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(MSG_IDE, 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(MSG_EXTEND, host->addr + TUL_SFifo);
            outb(3, host->addr + TUL_SFifo);
            outb(1, 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(MSG_EXTEND, host->addr + TUL_SFifo);
      outb(2, host->addr + TUL_SFifo);
      outb(3, 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(MSG_DEVRST, 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 = cpu_to_le32((u32)dma_addr);
      cblk->senselen = cpu_to_le32(SENSE_SIZE);
      cmnd->SCp.ptr = (char *)(unsigned long)dma_addr;
      cblk->cdblen = cmnd->cmd_len;

      /* Clear the returned status */
      cblk->hastat = 0;
      cblk->tastat = 0;
      /* Command the command */
      memcpy(&cblk->cdb[0], &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 = cpu_to_le32((u32)dma_addr);
            cmnd->SCp.dma_handle = 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));
                  total_len += sg->len = cpu_to_le32((u32)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 -     Queue a new command if possible
 *    @cmd: SCSI command block from the mid layer
 *    @done: Completion handler
 *
 *    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 int i91u_queuecommand(struct scsi_cmnd *cmd,
            void (*done)(struct scsi_cmnd *))
{
      struct initio_host *host = (struct initio_host *) cmd->device->host->hostdata;
      struct scsi_ctrl_blk *cmnd;

      cmd->scsi_done = done;

      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;
}

/**
 *    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_biospararm               -     return the "logical geometry
 *    @sdev: SCSI device
 *    @dev; Matching block device
 *    @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 block_device *dev,
            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 (cmnd->SCp.ptr) {
            dma_unmap_single(&pci_dev->dev,
                         (dma_addr_t)((unsigned long)cmnd->SCp.ptr),
                         SENSE_SIZE, DMA_FROM_DEVICE);
            cmnd->SCp.ptr = NULL;
      }

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

            scsi_dma_unmap(cmnd);
      }
}

/**
 *    i91uSCBPost       -     SCSI callback
 *    @host: Pointer to host adapter control block.
 *    @cmnd: Pointer to SCSI control block.
 *
 *    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);
      WARN_ON(cmnd == NULL);
      i91u_unmap_scb(host->pci_dev, cmnd);
      cmnd->scsi_done(cmnd);  /* Notify system DONE           */
      initio_release_scb(host, cblk);     /* Release SCB for current channel */
}

static 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_per_lun            = 1,
      .use_clustering         = ENABLE_CLUSTERING,
      .use_sg_chaining  = ENABLE_SG_CHAINING,
};

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 (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
            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);
            if ((scb = kzalloc(i, GFP_DMA)) != NULL)
                  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_DISABLED|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 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           = __devexit_p(initio_remove_one),
};

static int __init initio_init_driver(void)
{
      return pci_register_driver(&initio_pci_driver);
}

static void __exit initio_exit_driver(void)
{
      pci_unregister_driver(&initio_pci_driver);
}

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

module_init(initio_init_driver);
module_exit(initio_exit_driver);

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