// SPDX-License-Identifier: GPL-2.0-or-later

  /**************************************************************************
   * Initio 9100 device driver for Linux.
   *
   * Copyright (c) 1994-1998 Initio Corporation
   * Copyright (c) 1998 Bas Vermeulen <bvermeul@blackstar.xs4all.nl>

   * Copyright (c) 2004 Christoph Hellwig <hch@lst.de>

   * Copyright (c) 2007 Red Hat

   *

   *************************************************************************
   *
   * DESCRIPTION:
   *
   * This is the Linux low-level SCSI driver for Initio INI-9X00U/UW SCSI host
   * adapters
   *
   * 08/06/97 hc	- v1.01h
   *		- Support inic-940 and inic-935
   * 09/26/97 hc	- v1.01i
   *		- Make correction from J.W. Schultz suggestion
   * 10/13/97 hc	- Support reset function
   * 10/21/97 hc	- v1.01j
   *		- Support 32 LUN (SCSI 3)
   * 01/14/98 hc	- v1.01k
   *		- Fix memory allocation problem
   * 03/04/98 hc	- v1.01l
   *		- Fix tape rewind which will hang the system problem

   *		- Set can_queue to initio_num_scb

   * 06/25/98 hc	- v1.01m
   *		- Get it work for kernel version >= 2.1.75

   *		- Dynamic assign SCSI bus reset holding time in initio_init()

   * 07/02/98 hc	- v1.01n
   *		- Support 0002134A
   * 08/07/98 hc  - v1.01o

   *		- Change the initio_abort_srb routine to use scsi_done. <01>

   * 09/07/98 hl  - v1.02
   *              - Change the INI9100U define and proc_dir_entry to
   *                reflect the newer Kernel 2.1.118, but the v1.o1o
   *                should work with Kernel 2.1.118.
   * 09/20/98 wh  - v1.02a
   *              - Support Abort command.
   *              - Handle reset routine.
   * 09/21/98 hl  - v1.03
   *              - remove comments.
   * 12/09/98 bv	- v1.03a
   *		- Removed unused code
   * 12/13/98 bv	- v1.03b
   *		- Remove cli() locking for kernels >= 2.1.95. This uses
   *		  spinlocks to serialize access to the pSRB_head and
   *		  pSRB_tail members of the HCS structure.
   * 09/01/99 bv	- v1.03d
   *		- Fixed a deadlock problem in SMP.
   * 21/01/99 bv	- v1.03e
   *		- Add support for the Domex 3192U PCI SCSI
   *		  This is a slightly modified patch by
   *		  Brian Macy <bmacy@sunshinecomputing.com>
   * 22/02/99 bv	- v1.03f
   *		- Didn't detect the INIC-950 in 2.0.x correctly.
   *		  Now fixed.
   * 05/07/99 bv	- v1.03g
   *		- Changed the assumption that HZ = 100
   * 10/17/03 mc	- v1.04
   *		- added new DMA API support
   * 06/01/04 jmd	- v1.04a
   *		- Re-add reset_bus support
   **************************************************************************/
  
  #include <linux/module.h>
  #include <linux/errno.h>
  #include <linux/delay.h>
  #include <linux/pci.h>
  #include <linux/init.h>
  #include <linux/blkdev.h>
  #include <linux/spinlock.h>
  #include <linux/stat.h>

  #include <linux/kernel.h>
  #include <linux/proc_fs.h>
  #include <linux/string.h>
  #include <linux/interrupt.h>
  #include <linux/ioport.h>

  #include <linux/slab.h>
  #include <linux/jiffies.h>

  #include <linux/dma-mapping.h>

  #include <asm/io.h>
  
  #include <scsi/scsi.h>
  #include <scsi/scsi_cmnd.h>
  #include <scsi/scsi_device.h>
  #include <scsi/scsi_host.h>
  #include <scsi/scsi_tcq.h>
  
  #include "initio.h"
  
  #define SENSE_SIZE		14
  
  #define i91u_MAXQUEUE		2
  #define i91u_REVID "Initio INI-9X00U/UW SCSI device driver; Revision: 1.04a"

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

  static int initio_tag_enable = 1;

  
  #ifdef DEBUG_i91u
  static int setup_debug = 0;
  #endif

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

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

  /*--- forward references ---*/
  static struct scsi_ctrl_blk *initio_find_busy_scb(struct initio_host * host, u16 tarlun);
  static struct scsi_ctrl_blk *initio_find_done_scb(struct initio_host * host);
  
  static int tulip_main(struct initio_host * host);
  
  static int initio_next_state(struct initio_host * host);
  static int initio_state_1(struct initio_host * host);
  static int initio_state_2(struct initio_host * host);
  static int initio_state_3(struct initio_host * host);
  static int initio_state_4(struct initio_host * host);
  static int initio_state_5(struct initio_host * host);
  static int initio_state_6(struct initio_host * host);
  static int initio_state_7(struct initio_host * host);
  static int initio_xfer_data_in(struct initio_host * host);
  static int initio_xfer_data_out(struct initio_host * host);
  static int initio_xpad_in(struct initio_host * host);
  static int initio_xpad_out(struct initio_host * host);
  static int initio_status_msg(struct initio_host * host);
  
  static int initio_msgin(struct initio_host * host);
  static int initio_msgin_sync(struct initio_host * host);
  static int initio_msgin_accept(struct initio_host * host);
  static int initio_msgout_reject(struct initio_host * host);
  static int initio_msgin_extend(struct initio_host * host);
  
  static int initio_msgout_ide(struct initio_host * host);
  static int initio_msgout_abort_targ(struct initio_host * host);
  static int initio_msgout_abort_tag(struct initio_host * host);
  
  static int initio_bus_device_reset(struct initio_host * host);
  static void initio_select_atn(struct initio_host * host, struct scsi_ctrl_blk * scb);
  static void initio_select_atn3(struct initio_host * host, struct scsi_ctrl_blk * scb);
  static void initio_select_atn_stop(struct initio_host * host, struct scsi_ctrl_blk * scb);
  static int int_initio_busfree(struct initio_host * host);
  static int int_initio_scsi_rst(struct initio_host * host);
  static int int_initio_bad_seq(struct initio_host * host);
  static int int_initio_resel(struct initio_host * host);
  static int initio_sync_done(struct initio_host * host);
  static int wdtr_done(struct initio_host * host);
  static int wait_tulip(struct initio_host * host);
  static int initio_wait_done_disc(struct initio_host * host);
  static int initio_wait_disc(struct initio_host * host);
  static void tulip_scsi(struct initio_host * host);
  static int initio_post_scsi_rst(struct initio_host * host);
  
  static void initio_se2_ew_en(unsigned long base);
  static void initio_se2_ew_ds(unsigned long base);
  static int initio_se2_rd_all(unsigned long base);
  static void initio_se2_update_all(unsigned long base);	/* setup default pattern */
  static void initio_read_eeprom(unsigned long base);
  
  /* ---- INTERNAL VARIABLES ---- */

  static NVRAM i91unvram;
  static NVRAM *i91unvramp;

  static u8 i91udftNvRam[64] =

  {

  	/*----------- header -----------*/

  	0x25, 0xc9,		/* Signature    */
  	0x40,			/* Size         */
  	0x01,			/* Revision     */
  	/* -- Host Adapter Structure -- */
  	0x95,			/* ModelByte0   */
  	0x00,			/* ModelByte1   */
  	0x00,			/* ModelInfo    */
  	0x01,			/* NumOfCh      */
  	NBC1_DEFAULT,		/* BIOSConfig1  */
  	0,			/* BIOSConfig2  */
  	0,			/* HAConfig1    */
  	0,			/* HAConfig2    */
  	/* SCSI channel 0 and target Structure  */
  	7,			/* SCSIid       */
  	NCC1_DEFAULT,		/* SCSIconfig1  */
  	0,			/* SCSIconfig2  */
  	0x10,			/* NumSCSItarget */
  
  	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
  	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
  	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
  	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
  
  	/* SCSI channel 1 and target Structure  */
  	7,			/* SCSIid       */
  	NCC1_DEFAULT,		/* SCSIconfig1  */
  	0,			/* SCSIconfig2  */
  	0x10,			/* NumSCSItarget */
  
  	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
  	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
  	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
  	NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
  	0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  	0, 0};			/*      - CheckSum -            */

  static u8 initio_rate_tbl[8] =	/* fast 20      */

  {

  				/* nanosecond divide by 4 */

  	12,			/* 50ns,  20M   */
  	18,			/* 75ns,  13.3M */
  	25,			/* 100ns, 10M   */
  	31,			/* 125ns, 8M    */
  	37,			/* 150ns, 6.6M  */
  	43,			/* 175ns, 5.7M  */
  	50,			/* 200ns, 5M    */
  	62			/* 250ns, 4M    */
  };

  static void initio_do_pause(unsigned amount)
  {
  	/* Pause for amount jiffies */

  	unsigned long the_time = jiffies + amount;

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

  }
  
  /*-- forward reference --*/

  /******************************************************************
   Input: instruction for  Serial E2PROM
  
   EX: se2_rd(0 call se2_instr() to send address and read command
  
  	 StartBit  OP_Code   Address                Data
  	 --------- --------  ------------------     -------
  	 1         1 , 0     A5,A4,A3,A2,A1,A0      D15-D0
  
  		 +-----------------------------------------------------
  		 |
   CS -----+
  			+--+  +--+  +--+  +--+  +--+
  			^  |  ^  |  ^  |  ^  |  ^  |
  			|  |  |  |  |  |  |  |  |  |
   CLK -------+  +--+  +--+  +--+  +--+  +--
   (leading edge trigger)
  
  		 +--1-----1--+
  		 | SB    OP  |  OP    A5    A4
   DI  ----+           +--0------------------
   (address and cmd sent to nvram)
  
  	 -------------------------------------------+
  												|
   DO                                             +---
   (data sent from nvram)
  
  
  ******************************************************************/

  
  /**
   *	initio_se2_instr	-	bitbang an instruction
   *	@base: Base of InitIO controller
   *	@instr: Instruction for serial E2PROM
   *
   *	Bitbang an instruction out to the serial E2Prom
   */
  
  static void initio_se2_instr(unsigned long base, u8 instr)

  {
  	int i;

  	u8 b;

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

  
  	for (i = 0; i < 8; i++) {
  		if (instr & 0x80)

  			b = SE2CS | SE2DO;		/* -CLK+dataBit */

  		else

  			b = SE2CS;			/* -CLK */
  		outb(b, base + TUL_NVRAM);
  		udelay(30);
  		outb(b | SE2CLK, base + TUL_NVRAM);	/* +CLK */
  		udelay(30);

  		instr <<= 1;
  	}

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

  }

  /**
   *	initio_se2_ew_en	-	Enable erase/write
   *	@base: Base address of InitIO controller
   *
   *	Enable erase/write state of serial EEPROM
   */
  void initio_se2_ew_en(unsigned long base)

  {

  	initio_se2_instr(base, 0x30);	/* EWEN */
  	outb(0, base + TUL_NVRAM);	/* -CS  */
  	udelay(30);

  }

  /**
   *	initio_se2_ew_ds	-	Disable erase/write
   *	@base: Base address of InitIO controller
   *
   *	Disable erase/write state of serial EEPROM
   */
  void initio_se2_ew_ds(unsigned long base)

  {

  	initio_se2_instr(base, 0);	/* EWDS */
  	outb(0, base + TUL_NVRAM);	/* -CS  */
  	udelay(30);

  }

  /**
   *	initio_se2_rd		-	read E2PROM word
   *	@base: Base of InitIO controller
   *	@addr: Address of word in E2PROM
   *
   *	Read a word from the NV E2PROM device
   */
  static u16 initio_se2_rd(unsigned long base, u8 addr)

  {

  	u8 instr, rb;
  	u16 val = 0;

  	int i;

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

  
  	for (i = 15; i >= 0; i--) {

  		outb(SE2CS | SE2CLK, base + TUL_NVRAM);	/* +CLK */
  		udelay(30);
  		outb(SE2CS, base + TUL_NVRAM);		/* -CLK */

  
  		/* sample data after the following edge of clock  */

  		rb = inb(base + TUL_NVRAM);
  		rb &= SE2DI;
  		val += (rb << i);
  		udelay(30);	/* 6/20/95 */

  	}

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

  }

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

  {

  	u8 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 necessary

   */

  static void initio_stop_bm(struct initio_host * host)

  {

  	if (inb(host->addr + TUL_XStatus) & XPEND) {	/* if DMA xfer is pending, abort DMA xfer */
  		outb(TAX_X_ABT | TAX_X_CLR_FIFO, host->addr + TUL_XCmd);

  		/* wait Abort DMA xfer done */

  		while ((inb(host->addr + TUL_Int) & XABT) == 0)
  			cpu_relax();

  	}

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

  }

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

  static int initio_reset_scsi(struct initio_host * host, int seconds)

  {

  	outb(TSC_RST_BUS, host->addr + TUL_SCtrl0);

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

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

  
  	/* Stall for a while, wait for target's firmware ready,make it 2 sec ! */
  	/* SONY 5200 tape drive won't work if only stall for 1 sec */

  	/* FIXME: this is a very long busy wait right now */
  	initio_do_pause(seconds * HZ);

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

  }

  /**
   *	initio_init		-	set up an InitIO host adapter
   *	@host: InitIO host adapter
   *	@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
  ",

  	       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 ... 
  ");
  		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
  ", 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
  ", 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
   *
   */

  static int initio_state_7(struct initio_host * host)

  {
  	int cnt, i;
  
  #if DEBUG_STATE
  	printk("-s7-");
  #endif
  	/* flush SCSI FIFO */

  	cnt = inb(host->addr + TUL_SFifoCnt) & 0x1F;

  	if (cnt) {
  		for (i = 0; i < cnt; i++)

  			inb(host->addr + TUL_SFifo);

  	}

  	switch (host->phase) {

  	case DATA_IN:		/* Data in phase                */
  	case DATA_OUT:		/* Data out phase               */

  		return initio_bad_seq(host);

  	default:

  		return 6;	/* Go to state 6                */

  	}
  }

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

  {

  	struct scsi_ctrl_blk *scb = host->active;

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

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