/*
   *  sym53c416.c
   *  Low-level SCSI driver for sym53c416 chip.
   *  Copyright (C) 1998 Lieven Willems (lw_linux@hotmail.com)
   * 
   *  Changes : 
   * 
   *  Marcelo Tosatti <marcelo@conectiva.com.br> : Added io_request_lock locking

   *  Alan Cox <alan@lxorguk.ukuu.org.uk> : Cleaned up code formatting

   *				 Fixed an irq locking bug
   *				 Added ISAPnP support
   *  Bjoern A. Zeeb <bzeeb@zabbadoz.net> : Initial irq locking updates
   *					  Added another card with ISAPnP support
   * 
   *  LILO command line usage: sym53c416=<PORTBASE>[,<IRQ>]
   *
   *  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.
   *
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/init.h>
  #include <linux/string.h>
  #include <linux/ioport.h>

  #include <linux/interrupt.h>
  #include <linux/delay.h>
  #include <linux/proc_fs.h>
  #include <linux/spinlock.h>
  #include <asm/dma.h>
  #include <asm/system.h>
  #include <asm/io.h>
  #include <linux/blkdev.h>
  #include <linux/isapnp.h>
  #include "scsi.h"
  #include <scsi/scsi_host.h>
  #include "sym53c416.h"
  
  #define VERSION_STRING        "Version 1.0.0-ac"
  
  #define TC_LOW       0x00     /* Transfer counter low        */
  #define TC_MID       0x01     /* Transfer counter mid        */
  #define SCSI_FIFO    0x02     /* SCSI FIFO register          */
  #define COMMAND_REG  0x03     /* Command Register            */
  #define STATUS_REG   0x04     /* Status Register (READ)      */
  #define DEST_BUS_ID  0x04     /* Destination Bus ID (WRITE)  */
  #define INT_REG      0x05     /* Interrupt Register (READ)   */
  #define TOM          0x05     /* Time out multiplier (WRITE) */
  #define STP          0x06     /* Synchronous Transfer period */
  #define SYNC_OFFSET  0x07     /* Synchronous Offset          */
  #define CONF_REG_1   0x08     /* Configuration register 1    */
  #define CONF_REG_2   0x0B     /* Configuration register 2    */
  #define CONF_REG_3   0x0C     /* Configuration register 3    */
  #define CONF_REG_4   0x0D     /* Configuration register 4    */
  #define TC_HIGH      0x0E     /* Transfer counter high       */
  #define PIO_FIFO_1   0x10     /* PIO FIFO register 1         */
  #define PIO_FIFO_2   0x11     /* PIO FIFO register 2         */
  #define PIO_FIFO_3   0x12     /* PIO FIFO register 3         */
  #define PIO_FIFO_4   0x13     /* PIO FIFO register 4         */
  #define PIO_FIFO_CNT 0x14     /* PIO FIFO count              */
  #define PIO_INT_REG  0x15     /* PIO interrupt register      */
  #define CONF_REG_5   0x16     /* Configuration register 5    */
  #define FEATURE_EN   0x1D     /* Feature Enable register     */
  
  /* Configuration register 1 entries: */
  /* Bits 2-0: SCSI ID of host adapter */
  #define SCM    0x80                     /* Slow Cable Mode              */
  #define SRID   0x40                     /* SCSI Reset Interrupt Disable */
  #define PTM    0x20                     /* Parity Test Mode             */
  #define EPC    0x10                     /* Enable Parity Checking       */
  #define CTME   0x08                     /* Special Test Mode            */
  
  /* Configuration register 2 entries: */
  #define FE     0x40                     /* Features Enable              */
  #define SCSI2  0x08                     /* SCSI 2 Enable                */
  #define TBPA   0x04                     /* Target Bad Parity Abort      */
  
  /* Configuration register 3 entries: */
  #define IDMRC  0x80                     /* ID Message Reserved Check    */
  #define QTE    0x40                     /* Queue Tag Enable             */
  #define CDB10  0x20                     /* Command Descriptor Block 10  */
  #define FSCSI  0x10                     /* FastSCSI                     */
  #define FCLK   0x08                     /* FastClock                    */
  
  /* Configuration register 4 entries: */
  #define RBS    0x08                     /* Register bank select         */
  #define EAN    0x04                     /* Enable Active Negotiation    */
  
  /* Configuration register 5 entries: */
  #define LPSR   0x80                     /* Lower Power SCSI Reset       */
  #define IE     0x20                     /* Interrupt Enable             */
  #define LPM    0x02                     /* Low Power Mode               */
  #define WSE0   0x01                     /* 0WS Enable                   */
  
  /* Interrupt register entries: */
  #define SRST   0x80                     /* SCSI Reset                   */
  #define ILCMD  0x40                     /* Illegal Command              */
  #define DIS    0x20                     /* Disconnect                   */
  #define BS     0x10                     /* Bus Service                  */
  #define FC     0x08                     /* Function Complete            */
  #define RESEL  0x04                     /* Reselected                   */
  #define SI     0x03                     /* Selection Interrupt          */
  
  /* Status Register Entries: */
  #define SCI    0x80                     /* SCSI Core Int                */
  #define GE     0x40                     /* Gross Error                  */
  #define PE     0x20                     /* Parity Error                 */
  #define TC     0x10                     /* Terminal Count               */
  #define VGC    0x08                     /* Valid Group Code             */
  #define PHBITS 0x07                     /* Phase bits                   */
  
  /* PIO Interrupt Register Entries: */
  #define SCI    0x80                     /* SCSI Core Int                */
  #define PFI    0x40                     /* PIO FIFO Interrupt           */
  #define FULL   0x20                     /* PIO FIFO Full                */
  #define EMPTY  0x10                     /* PIO FIFO Empty               */
  #define CE     0x08                     /* Collision Error              */
  #define OUE    0x04                     /* Overflow / Underflow error   */
  #define FIE    0x02                     /* Full Interrupt Enable        */
  #define EIE    0x01                     /* Empty Interrupt Enable       */
  
  /* SYM53C416 SCSI phases (lower 3 bits of SYM53C416_STATUS_REG) */
  #define PHASE_DATA_OUT    0x00
  #define PHASE_DATA_IN     0x01
  #define PHASE_COMMAND     0x02
  #define PHASE_STATUS      0x03
  #define PHASE_RESERVED_1  0x04
  #define PHASE_RESERVED_2  0x05
  #define PHASE_MESSAGE_OUT 0x06
  #define PHASE_MESSAGE_IN  0x07
  
  /* SYM53C416 core commands */
  #define NOOP                      0x00
  #define FLUSH_FIFO                0x01
  #define RESET_CHIP                0x02
  #define RESET_SCSI_BUS            0x03
  #define DISABLE_SEL_RESEL         0x45
  #define RESEL_SEQ                 0x40
  #define SEL_WITHOUT_ATN_SEQ       0x41
  #define SEL_WITH_ATN_SEQ          0x42
  #define SEL_WITH_ATN_AND_STOP_SEQ 0x43
  #define ENABLE_SEL_RESEL          0x44
  #define SEL_WITH_ATN3_SEQ         0x46
  #define RESEL3_SEQ                0x47
  #define SND_MSG                   0x20
  #define SND_STAT                  0x21
  #define SND_DATA                  0x22
  #define DISCONNECT_SEQ            0x23
  #define TERMINATE_SEQ             0x24
  #define TARGET_COMM_COMPLETE_SEQ  0x25
  #define DISCONN                   0x27
  #define RECV_MSG_SEQ              0x28
  #define RECV_CMD                  0x29
  #define RECV_DATA                 0x2A
  #define RECV_CMD_SEQ              0x2B
  #define TARGET_ABORT_PIO          0x04
  #define TRANSFER_INFORMATION      0x10
  #define INIT_COMM_COMPLETE_SEQ    0x11
  #define MSG_ACCEPTED              0x12
  #define TRANSFER_PAD              0x18
  #define SET_ATN                   0x1A
  #define RESET_ATN                 0x1B
  #define ILLEGAL                   0xFF
  
  #define PIO_MODE                  0x80
  
  #define IO_RANGE 0x20         /* 0x00 - 0x1F                   */
  #define ID       "sym53c416"	/* Attention: copied to the sym53c416.h */
  #define PIO_SIZE 128          /* Size of PIO fifo is 128 bytes */
  
  #define READ_TIMEOUT              150
  #define WRITE_TIMEOUT             150
  
  #ifdef MODULE
  
  #define sym53c416_base sym53c416
  #define sym53c416_base_1 sym53c416_1
  #define sym53c416_base_2 sym53c416_2
  #define sym53c416_base_3 sym53c416_3

  static unsigned int sym53c416_base[2];
  static unsigned int sym53c416_base_1[2];
  static unsigned int sym53c416_base_2[2];
  static unsigned int sym53c416_base_3[2];

  
  #endif
  
  #define MAXHOSTS 4

  #define SG_ADDRESS(buffer)     ((char *) sg_virt((buffer)))

  
  enum phases
  {
  	idle,
  	data_out,
  	data_in,
  	command_ph,
  	status_ph,
  	message_out,
  	message_in
  };
  
  typedef struct
  {
  	int base;
  	int irq;
  	int scsi_id;
  } host;
  
  static host hosts[MAXHOSTS] = {
                         {0, 0, SYM53C416_SCSI_ID},
                         {0, 0, SYM53C416_SCSI_ID},
                         {0, 0, SYM53C416_SCSI_ID},
                         {0, 0, SYM53C416_SCSI_ID}
                         };
  
  static int host_index = 0;
  static char info[120];
  static Scsi_Cmnd *current_command = NULL;
  static int fastpio = 1;
  
  static int probeaddrs[] = {0x200, 0x220, 0x240, 0};
  
  static void sym53c416_set_transfer_counter(int base, unsigned int len)
  {
  	/* Program Transfer Counter */
  	outb(len & 0x0000FF, base + TC_LOW);
  	outb((len & 0x00FF00) >> 8, base + TC_MID);
  	outb((len & 0xFF0000) >> 16, base + TC_HIGH);
  }
  
  static DEFINE_SPINLOCK(sym53c416_lock);
  
  /* Returns the number of bytes read */
  static __inline__ unsigned int sym53c416_read(int base, unsigned char *buffer, unsigned int len)
  {
  	unsigned int orig_len = len;
  	unsigned long flags = 0;
  	unsigned int bytes_left;
  	unsigned long i;
  	int timeout = READ_TIMEOUT;
  
  	/* Do transfer */
  	spin_lock_irqsave(&sym53c416_lock, flags);
  	while(len && timeout)
  	{
  		bytes_left = inb(base + PIO_FIFO_CNT); /* Number of bytes in the PIO FIFO */
  		if(fastpio && bytes_left > 3)
  		{
  			insl(base + PIO_FIFO_1, buffer, bytes_left >> 2);
  			buffer += bytes_left & 0xFC;
  			len -= bytes_left & 0xFC;
  		}
  		else if(bytes_left > 0)
  		{
  			len -= bytes_left;
  			for(; bytes_left > 0; bytes_left--)
  				*(buffer++) = inb(base + PIO_FIFO_1);
  		}
  		else
  		{
  			i = jiffies + timeout;
  			spin_unlock_irqrestore(&sym53c416_lock, flags);
  			while(time_before(jiffies, i) && (inb(base + PIO_INT_REG) & EMPTY) && timeout)
  				if(inb(base + PIO_INT_REG) & SCI)
  					timeout = 0;
  			spin_lock_irqsave(&sym53c416_lock, flags);
  			if(inb(base + PIO_INT_REG) & EMPTY)
  				timeout = 0;
  		}
  	}
  	spin_unlock_irqrestore(&sym53c416_lock, flags);
  	return orig_len - len;
  }
  
  /* Returns the number of bytes written */
  static __inline__ unsigned int sym53c416_write(int base, unsigned char *buffer, unsigned int len)
  {
  	unsigned int orig_len = len;
  	unsigned long flags = 0;
  	unsigned int bufferfree;
  	unsigned long i;
  	unsigned int timeout = WRITE_TIMEOUT;
  
  	/* Do transfer */
  	spin_lock_irqsave(&sym53c416_lock, flags);
  	while(len && timeout)
  	{
  		bufferfree = PIO_SIZE - inb(base + PIO_FIFO_CNT);
  		if(bufferfree > len)
  			bufferfree = len;
  		if(fastpio && bufferfree > 3)
  		{
  			outsl(base + PIO_FIFO_1, buffer, bufferfree >> 2);
  			buffer += bufferfree & 0xFC;
  			len -= bufferfree & 0xFC;
  		}
  		else if(bufferfree > 0)
  		{
  			len -= bufferfree;
  			for(; bufferfree > 0; bufferfree--)
  				outb(*(buffer++), base + PIO_FIFO_1);
  		}
  		else
  		{
  			i = jiffies + timeout;
  			spin_unlock_irqrestore(&sym53c416_lock, flags);
  			while(time_before(jiffies, i) && (inb(base + PIO_INT_REG) & FULL) && timeout)
  				;
  			spin_lock_irqsave(&sym53c416_lock, flags);
  			if(inb(base + PIO_INT_REG) & FULL)
  				timeout = 0;
  		}
  	}
  	spin_unlock_irqrestore(&sym53c416_lock, flags);
  	return orig_len - len;
  }

  static irqreturn_t sym53c416_intr_handle(int irq, void *dev_id)

  {
  	struct Scsi_Host *dev = dev_id;

  	int base = dev->io_port;

  	int i;
  	unsigned long flags = 0;
  	unsigned char status_reg, pio_int_reg, int_reg;

  	struct scatterlist *sg;

  	unsigned int tot_trans = 0;

  	spin_lock_irqsave(dev->host_lock,flags);
  	status_reg = inb(base + STATUS_REG);
  	pio_int_reg = inb(base + PIO_INT_REG);
  	int_reg = inb(base + INT_REG);
  	spin_unlock_irqrestore(dev->host_lock, flags);
  
  	/* First, we handle error conditions */
  	if(int_reg & SCI)         /* SCSI Reset */
  	{
  		printk(KERN_DEBUG "sym53c416: Reset received
  ");
  		current_command->SCp.phase = idle;
  		current_command->result = DID_RESET << 16;
  		spin_lock_irqsave(dev->host_lock, flags);
  		current_command->scsi_done(current_command);
  		spin_unlock_irqrestore(dev->host_lock, flags);
  		goto out;
  	}
  	if(int_reg & ILCMD)       /* Illegal Command */
  	{
  		printk(KERN_WARNING "sym53c416: Illegal Command: 0x%02x.
  ", inb(base + COMMAND_REG));
  		current_command->SCp.phase = idle;
  		current_command->result = DID_ERROR << 16;
  		spin_lock_irqsave(dev->host_lock, flags);
  		current_command->scsi_done(current_command);
  		spin_unlock_irqrestore(dev->host_lock, flags);
  		goto out;
  	}
  	if(status_reg & GE)         /* Gross Error */
  	{
  		printk(KERN_WARNING "sym53c416: Controller reports gross error.
  ");
  		current_command->SCp.phase = idle;
  		current_command->result = DID_ERROR << 16;
  		spin_lock_irqsave(dev->host_lock, flags);
  		current_command->scsi_done(current_command);
  		spin_unlock_irqrestore(dev->host_lock, flags);
  		goto out;
  	}
  	if(status_reg & PE)         /* Parity Error */
  	{
  		printk(KERN_WARNING "sym53c416:SCSI parity error.
  ");
  		current_command->SCp.phase = idle;
  		current_command->result = DID_PARITY << 16;
  		spin_lock_irqsave(dev->host_lock, flags);
  		current_command->scsi_done(current_command);
  		spin_unlock_irqrestore(dev->host_lock, flags);
  		goto out;
  	}
  	if(pio_int_reg & (CE | OUE))
  	{
  		printk(KERN_WARNING "sym53c416: PIO interrupt error.
  ");
  		current_command->SCp.phase = idle;
  		current_command->result = DID_ERROR << 16;
  		spin_lock_irqsave(dev->host_lock, flags);
  		current_command->scsi_done(current_command);
  		spin_unlock_irqrestore(dev->host_lock, flags);
  		goto out;
  	}
  	if(int_reg & DIS)           /* Disconnect */
  	{
  		if(current_command->SCp.phase != message_in)
  			current_command->result = DID_NO_CONNECT << 16;
  		else
  			current_command->result = (current_command->SCp.Status & 0xFF) | ((current_command->SCp.Message & 0xFF) << 8) | (DID_OK << 16);
  		current_command->SCp.phase = idle;
  		spin_lock_irqsave(dev->host_lock, flags);
  		current_command->scsi_done(current_command);
  		spin_unlock_irqrestore(dev->host_lock, flags);
  		goto out;
  	}
  	/* Now we handle SCSI phases         */
  
  	switch(status_reg & PHBITS)       /* Filter SCSI phase out of status reg */
  	{
  		case PHASE_DATA_OUT:
  		{
  			if(int_reg & BS)
  			{
  				current_command->SCp.phase = data_out;
  				outb(FLUSH_FIFO, base + COMMAND_REG);

  				sym53c416_set_transfer_counter(base,
  							       scsi_bufflen(current_command));

  				outb(TRANSFER_INFORMATION | PIO_MODE, base + COMMAND_REG);

  
  				scsi_for_each_sg(current_command,
  						 sg, scsi_sg_count(current_command), i) {
  					tot_trans += sym53c416_write(base,
  								     SG_ADDRESS(sg),
  								     sg->length);

  				}
  				if(tot_trans < current_command->underflow)
  					printk(KERN_WARNING "sym53c416: Underflow, wrote %d bytes, request for %d bytes.
  ", tot_trans, current_command->underflow);
  			}
  			break;
  		}
  
  		case PHASE_DATA_IN:
  		{
  			if(int_reg & BS)
  			{
  				current_command->SCp.phase = data_in;
  				outb(FLUSH_FIFO, base + COMMAND_REG);

  				sym53c416_set_transfer_counter(base,
  							       scsi_bufflen(current_command));

  				outb(TRANSFER_INFORMATION | PIO_MODE, base + COMMAND_REG);

  
  				scsi_for_each_sg(current_command,
  						 sg, scsi_sg_count(current_command), i) {
  					tot_trans += sym53c416_read(base,
  								    SG_ADDRESS(sg),
  								    sg->length);

  				}
  				if(tot_trans < current_command->underflow)
  					printk(KERN_WARNING "sym53c416: Underflow, read %d bytes, request for %d bytes.
  ", tot_trans, current_command->underflow);
  			}
  			break;
  		}
  
  		case PHASE_COMMAND:
  		{
  			current_command->SCp.phase = command_ph;
  			printk(KERN_ERR "sym53c416: Unknown interrupt in command phase.
  ");
  			break;
  		}
  
  		case PHASE_STATUS:
  		{
  			current_command->SCp.phase = status_ph;
  			outb(FLUSH_FIFO, base + COMMAND_REG);
  			outb(INIT_COMM_COMPLETE_SEQ, base + COMMAND_REG);
  			break;
  		}
  		
  		case PHASE_RESERVED_1:
  		case PHASE_RESERVED_2:
  		{
  			printk(KERN_ERR "sym53c416: Reserved phase occurred.
  ");
  			break;
  		}
  
  		case PHASE_MESSAGE_OUT:
  		{
  			current_command->SCp.phase = message_out;
  			outb(SET_ATN, base + COMMAND_REG);
  			outb(MSG_ACCEPTED, base + COMMAND_REG);
  			break;
  		}
  
  		case PHASE_MESSAGE_IN:
  		{
  			current_command->SCp.phase = message_in;
  			current_command->SCp.Status = inb(base + SCSI_FIFO);
  			current_command->SCp.Message = inb(base + SCSI_FIFO);
  			if(current_command->SCp.Message == SAVE_POINTERS || current_command->SCp.Message == DISCONNECT)
  				outb(SET_ATN, base + COMMAND_REG);
  			outb(MSG_ACCEPTED, base + COMMAND_REG);
  			break;
  		}
  	}
  out:
  	return IRQ_HANDLED;
  }
  
  static void sym53c416_init(int base, int scsi_id)
  {
  	outb(RESET_CHIP, base + COMMAND_REG);
  	outb(NOOP, base + COMMAND_REG);
  	outb(0x99, base + TOM); /* Time out of 250 ms */
  	outb(0x05, base + STP);
  	outb(0x00, base + SYNC_OFFSET);
  	outb(EPC | scsi_id, base + CONF_REG_1);
  	outb(FE | SCSI2 | TBPA, base + CONF_REG_2);
  	outb(IDMRC | QTE | CDB10 | FSCSI | FCLK, base + CONF_REG_3);
  	outb(0x83 | EAN, base + CONF_REG_4);
  	outb(IE | WSE0, base + CONF_REG_5);
  	outb(0, base + FEATURE_EN);
  }
  
  static int sym53c416_probeirq(int base, int scsi_id)
  {
  	int irq, irqs;
  	unsigned long i;
  
  	/* Clear interrupt register */
  	inb(base + INT_REG);
  	/* Start probing for irq's */
  	irqs = probe_irq_on();
  	/* Reinit chip */
  	sym53c416_init(base, scsi_id);
  	/* Cause interrupt */
  	outb(NOOP, base + COMMAND_REG);
  	outb(ILLEGAL, base + COMMAND_REG);
  	outb(0x07, base + DEST_BUS_ID);
  	outb(0x00, base + DEST_BUS_ID);
  	/* Wait for interrupt to occur */
  	i = jiffies + 20;
  	while(time_before(jiffies, i) && !(inb(base + STATUS_REG) & SCI))
  		barrier();
  	if(time_before_eq(i, jiffies))	/* timed out */
  		return 0;
  	/* Get occurred irq */
  	irq = probe_irq_off(irqs);
  	sym53c416_init(base, scsi_id);
  	return irq;
  }
  
  /* Setup: sym53c416=base,irq */
  void sym53c416_setup(char *str, int *ints)
  {
  	int i;
  
  	if(host_index >= MAXHOSTS)
  	{
  		printk(KERN_WARNING "sym53c416: Too many hosts defined
  ");
  		return;
  	}
  	if(ints[0] < 1 || ints[0] > 2)
  	{
  		printk(KERN_ERR "sym53c416: Wrong number of parameters:
  ");
  		printk(KERN_ERR "sym53c416: usage: sym53c416=<base>[,<irq>]
  ");
  		return;
  	}
  	for(i = 0; i < host_index && i >= 0; i++)
  	        if(hosts[i].base == ints[1])
          		i = -2;
  	if(i >= 0)
  	{
          	hosts[host_index].base = ints[1];
          	hosts[host_index].irq = (ints[0] == 2)? ints[2] : 0;
          	host_index++;
  	}
  }
  
  static int sym53c416_test(int base)
  {
  	outb(RESET_CHIP, base + COMMAND_REG);
  	outb(NOOP, base + COMMAND_REG);
  	if(inb(base + COMMAND_REG) != NOOP)
  		return 0;
  	if(!inb(base + TC_HIGH) || inb(base + TC_HIGH) == 0xFF)
  		return 0;
  	if((inb(base + PIO_INT_REG) & (FULL | EMPTY | CE | OUE | FIE | EIE)) != EMPTY)
  		return 0;
  	return 1;
  }
  
  
  static struct isapnp_device_id id_table[] __devinitdata = {
  	{	ISAPNP_ANY_ID, ISAPNP_ANY_ID,
  		ISAPNP_VENDOR('S','L','I'), ISAPNP_FUNCTION(0x4161), 0 },
  	{	ISAPNP_ANY_ID, ISAPNP_ANY_ID,
  		ISAPNP_VENDOR('S','L','I'), ISAPNP_FUNCTION(0x4163), 0 },
  	{	ISAPNP_DEVICE_SINGLE_END }
  };
  
  MODULE_DEVICE_TABLE(isapnp, id_table);
  
  static void sym53c416_probe(void)
  {
  	int *base = probeaddrs;
  	int ints[2];
  
  	ints[0] = 1;
  	for(; *base; base++) {
  		if (request_region(*base, IO_RANGE, ID)) {
  			if (sym53c416_test(*base)) {
  				ints[1] = *base;
  				sym53c416_setup(NULL, ints);
  			}
  			release_region(*base, IO_RANGE);
  		}
  	}
  }

  int __init sym53c416_detect(struct scsi_host_template *tpnt)

  {
  	unsigned long flags;
  	struct Scsi_Host * shpnt = NULL;
  	int i;
  	int count;
  	struct pnp_dev *idev = NULL;
  	
  #ifdef MODULE
  	int ints[3];
  
  	ints[0] = 2;

  	if(sym53c416_base[0])

  	{
  		ints[1] = sym53c416_base[0];
  		ints[2] = sym53c416_base[1];
  		sym53c416_setup(NULL, ints);
  	}

  	if(sym53c416_base_1[0])

  	{
  		ints[1] = sym53c416_base_1[0];
  		ints[2] = sym53c416_base_1[1];
  		sym53c416_setup(NULL, ints);
  	}

  	if(sym53c416_base_2[0])

  	{
  		ints[1] = sym53c416_base_2[0];
  		ints[2] = sym53c416_base_2[1];
  		sym53c416_setup(NULL, ints);
  	}

  	if(sym53c416_base_3[0])

  	{
  		ints[1] = sym53c416_base_3[0];
  		ints[2] = sym53c416_base_3[1];
  		sym53c416_setup(NULL, ints);
  	}
  #endif
  	printk(KERN_INFO "sym53c416.c: %s
  ", VERSION_STRING);
  
  	for (i=0; id_table[i].vendor != 0; i++) {
  		while((idev=pnp_find_dev(NULL, id_table[i].vendor,
  					id_table[i].function, idev))!=NULL)
  		{
  			int i[3];
  
  			if(pnp_device_attach(idev)<0)
  			{
  				printk(KERN_WARNING "sym53c416: unable to attach PnP device.
  ");
  				continue;
  			}
  			if(pnp_activate_dev(idev) < 0)
  			{
  				printk(KERN_WARNING "sym53c416: unable to activate PnP device.
  ");
  				pnp_device_detach(idev);
  				continue;
  			
  			}
  
  			i[0] = 2;
  			i[1] = pnp_port_start(idev, 0);
   			i[2] = pnp_irq(idev, 0);
  
  			printk(KERN_INFO "sym53c416: ISAPnP card found and configured at 0x%X, IRQ %d.
  ",
  				i[1], i[2]);
   			sym53c416_setup(NULL, i);
   		}
  	}
  	sym53c416_probe();
  
  	/* Now we register and set up each host adapter found... */
  	for(count = 0, i = 0; i < host_index; i++) {
  		if (!request_region(hosts[i].base, IO_RANGE, ID))
  			continue;
  		if (!sym53c416_test(hosts[i].base)) {
  			printk(KERN_WARNING "No sym53c416 found at address 0x%03x
  ", hosts[i].base);
  			goto fail_release_region;
  		}
  
  		/* We don't have an irq yet, so we should probe for one */
  		if (!hosts[i].irq)
  			hosts[i].irq = sym53c416_probeirq(hosts[i].base, hosts[i].scsi_id);
  		if (!hosts[i].irq)
  			goto fail_release_region;
  	
  		shpnt = scsi_register(tpnt, 0);
  		if (!shpnt)
  			goto fail_release_region;
  		/* Request for specified IRQ */
  		if (request_irq(hosts[i].irq, sym53c416_intr_handle, 0, ID, shpnt))
  			goto fail_free_host;
  
  		spin_lock_irqsave(&sym53c416_lock, flags);
  		shpnt->unique_id = hosts[i].base;
  		shpnt->io_port = hosts[i].base;
  		shpnt->n_io_port = IO_RANGE;
  		shpnt->irq = hosts[i].irq;
  		shpnt->this_id = hosts[i].scsi_id;
  		sym53c416_init(hosts[i].base, hosts[i].scsi_id);
  		count++;
  		spin_unlock_irqrestore(&sym53c416_lock, flags);
  		continue;
  
   fail_free_host:
  		scsi_unregister(shpnt);
   fail_release_region:
  		release_region(hosts[i].base, IO_RANGE);
  	}
  	return count;
  }
  
  const char *sym53c416_info(struct Scsi_Host *SChost)
  {
  	int i;
  	int base = SChost->io_port;
  	int irq = SChost->irq;
  	int scsi_id = 0;
  	int rev = inb(base + TC_HIGH);
  
  	for(i = 0; i < host_index; i++)
  		if(hosts[i].base == base)
  			scsi_id = hosts[i].scsi_id;
  	sprintf(info, "Symbios Logic 53c416 (rev. %d) at 0x%03x, irq %d, SCSI-ID %d, %s pio", rev, base, irq, scsi_id, (fastpio)? "fast" : "slow");
  	return info;
  }

  static int sym53c416_queuecommand_lck(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))

  {
  	int base;
  	unsigned long flags = 0;
  	int i;
  
  	/* Store base register as we can have more than one controller in the system */
  	base = SCpnt->device->host->io_port;
  	current_command = SCpnt;                  /* set current command                */
  	current_command->scsi_done = done;        /* set ptr to done function           */
  	current_command->SCp.phase = command_ph;  /* currect phase is the command phase */
  	current_command->SCp.Status = 0;
  	current_command->SCp.Message = 0;
  
  	spin_lock_irqsave(&sym53c416_lock, flags);

  	outb(scmd_id(SCpnt), base + DEST_BUS_ID); /* Set scsi id target        */

  	outb(FLUSH_FIFO, base + COMMAND_REG);    /* Flush SCSI and PIO FIFO's */
  	/* Write SCSI command into the SCSI fifo */
  	for(i = 0; i < SCpnt->cmd_len; i++)
  		outb(SCpnt->cmnd[i], base + SCSI_FIFO);
  	/* Start selection sequence */
  	outb(SEL_WITHOUT_ATN_SEQ, base + COMMAND_REG);
  	/* Now an interrupt will be generated which we will catch in out interrupt routine */
  	spin_unlock_irqrestore(&sym53c416_lock, flags);
  	return 0;
  }

  DEF_SCSI_QCMD(sym53c416_queuecommand)

  static int sym53c416_host_reset(Scsi_Cmnd *SCpnt)
  {
  	int base;
  	int scsi_id = -1;	
  	int i;

  	unsigned long flags;
  
  	spin_lock_irqsave(&sym53c416_lock, flags);

  
  	/* printk("sym53c416_reset
  "); */
  	base = SCpnt->device->host->io_port;

  	/* search scsi_id - fixme, we shouldn't need to iterate for this! */

  	for(i = 0; i < host_index && scsi_id == -1; i++)

  		if(hosts[i].base == base)
  			scsi_id = hosts[i].scsi_id;
  	outb(RESET_CHIP, base + COMMAND_REG);
  	outb(NOOP | PIO_MODE, base + COMMAND_REG);
  	outb(RESET_SCSI_BUS, base + COMMAND_REG);
  	sym53c416_init(base, scsi_id);

  
  	spin_unlock_irqrestore(&sym53c416_lock, flags);

  	return SUCCESS;
  }
  
  static int sym53c416_release(struct Scsi_Host *shost)
  {
  	if (shost->irq)
  		free_irq(shost->irq, shost);
  	if (shost->io_port && shost->n_io_port)
  		release_region(shost->io_port, shost->n_io_port);
  	return 0;
  }
  
  static int sym53c416_bios_param(struct scsi_device *sdev,
  		struct block_device *dev,
  		sector_t capacity, int *ip)
  {
  	int size;
  
  	size = capacity;
  	ip[0] = 64;				/* heads                        */
  	ip[1] = 32;				/* sectors                      */
  	if((ip[2] = size >> 11) > 1024)		/* cylinders, test for big disk */
  	{
  		ip[0] = 255;			/* heads                        */
  		ip[1] = 63;			/* sectors                      */
  		ip[2] = size / (255 * 63);	/* cylinders                    */
  	}
  	return 0;
  }
  
  /* Loadable module support */
  #ifdef MODULE
  
  MODULE_AUTHOR("Lieven Willems");
  MODULE_LICENSE("GPL");
  
  module_param_array(sym53c416, uint, NULL, 0);
  module_param_array(sym53c416_1, uint, NULL, 0);
  module_param_array(sym53c416_2, uint, NULL, 0);
  module_param_array(sym53c416_3, uint, NULL, 0);
  
  #endif

  static struct scsi_host_template driver_template = {

  	.proc_name =		"sym53c416",
  	.name =			"Symbios Logic 53c416",
  	.detect =		sym53c416_detect,
  	.info =			sym53c416_info,	
  	.queuecommand =		sym53c416_queuecommand,

  	.eh_host_reset_handler =sym53c416_host_reset,

  	.release = 		sym53c416_release,
  	.bios_param =		sym53c416_bios_param,
  	.can_queue =		1,
  	.this_id =		SYM53C416_SCSI_ID,
  	.sg_tablesize =		32,
  	.cmd_per_lun =		1,
  	.unchecked_isa_dma =	1,
  	.use_clustering =	ENABLE_CLUSTERING,
  };
  #include "scsi_module.c"