Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2079 insertions, 0 deletions

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
new file mode 100644
index 00000000000..601c7fccb4c
--- /dev/null
+++ b/drivers/char/isicom.c
@@ -0,0 +1,2079 @@
+/*
+ *	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 of the License, or (at your option) any later version.
+ *
+ *	Original driver code supplied by Multi-Tech
+ *
+ *	Changes
+ *	1/9/98	alan@redhat.com		Merge to 2.0.x kernel tree
+ *					Obtain and use official major/minors
+ *					Loader switched to a misc device
+ *					(fixed range check bug as a side effect)
+ *					Printk clean up
+ *	9/12/98	alan@redhat.com		Rough port to 2.1.x
+ *
+ *	10/6/99 sameer			Merged the ISA and PCI drivers to
+ *					a new unified driver.
+ *
+ *	3/9/99	sameer			Added support for ISI4616 cards.
+ *
+ *	16/9/99	sameer			We do not force RTS low anymore.
+ *					This is to prevent the firmware 
+ *					from getting confused.
+ *
+ *	26/10/99 sameer			Cosmetic changes:The driver now
+ *					dumps the Port Count information
+ *					along with I/O address and IRQ.
+ *
+ *	13/12/99 sameer			Fixed the problem with IRQ sharing.
+ *
+ *	10/5/00  sameer			Fixed isicom_shutdown_board()
+ *					to not lower DTR on all the ports
+ *					when the last port on the card is 
+ *					closed.
+ *
+ *	10/5/00  sameer			Signal mask setup command added
+ *					to  isicom_setup_port and 
+ *					isicom_shutdown_port.
+ *
+ *	24/5/00  sameer			The driver is now SMP aware.
+ *					
+ *	
+ *	27/11/00 Vinayak P Risbud	Fixed the Driver Crash Problem
+ *	
+ *	
+ *	03/01/01  anil .s		Added support for resetting the
+ *					internal modems on ISI cards.
+ *
+ *	08/02/01  anil .s		Upgraded the driver for kernel
+ *					2.4.x
+ *
+ *      11/04/01  Kevin			Fixed firmware load problem with
+ *					ISIHP-4X card
+ *	
+ *	30/04/01  anil .s		Fixed the remote login through
+ *					ISI port problem. Now the link
+ *					does not go down before password
+ *					prompt.
+ *
+ *	03/05/01  anil .s		Fixed the problem with IRQ sharing
+ *					among ISI-PCI cards.
+ *
+ *	03/05/01  anil .s		Added support to display the version
+ *					info during insmod as well as module 
+ *					listing by lsmod.
+ *	
+ *	10/05/01  anil .s		Done the modifications to the source
+ *					file and Install script so that the
+ *					same installation can be used for
+ *					2.2.x and 2.4.x kernel.
+ *
+ *	06/06/01  anil .s		Now we drop both dtr and rts during
+ *					shutdown_port as well as raise them
+ *					during isicom_config_port.
+ *  	
+ *	09/06/01 acme@conectiva.com.br	use capable, not suser, do
+ *					restore_flags on failure in
+ *					isicom_send_break, verify put_user
+ *					result
+ *
+ *  	11/02/03  ranjeeth		Added support for 230 Kbps and 460 Kbps
+ *  					Baud index extended to 21
+ *  	
+ *  	20/03/03  ranjeeth		Made to work for Linux Advanced server.
+ *  					Taken care of license warning.	
+ *      
+ *	10/12/03  Ravindra		Made to work for Fedora Core 1 of 
+ *					Red Hat Distribution
+ *
+ *	06/01/05  Alan Cox 		Merged the ISI and base kernel strands
+ *					into a single 2.6 driver
+ *
+ *	***********************************************************
+ *
+ *	To use this driver you also need the support package. You 
+ *	can find this in RPM format on
+ *		ftp://ftp.linux.org.uk/pub/linux/alan
+ * 	
+ *	You can find the original tools for this direct from Multitech
+ *		ftp://ftp.multitech.com/ISI-Cards/
+ *
+ *	Having installed the cards the module options (/etc/modprobe.conf)
+ *
+ *	options isicom   io=card1,card2,card3,card4 irq=card1,card2,card3,card4
+ *
+ *	Omit those entries for boards you don't have installed.
+ *
+ *	TODO
+ *		Hotplug
+ *		Merge testing
+ *		64-bit verification
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/termios.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/serial.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/interrupt.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
+#include <linux/pci.h>
+
+#include <linux/isicom.h>
+
+static struct pci_device_id isicom_pci_tbl[] = {
+	{ VENDOR_ID, 0x2028, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ VENDOR_ID, 0x2051, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ VENDOR_ID, 0x2052, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ VENDOR_ID, 0x2053, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ VENDOR_ID, 0x2054, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ VENDOR_ID, 0x2055, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ VENDOR_ID, 0x2056, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ VENDOR_ID, 0x2057, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ VENDOR_ID, 0x2058, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(pci, isicom_pci_tbl);
+
+static int prev_card = 3;	/*	start servicing isi_card[0]	*/
+static struct tty_driver *isicom_normal;
+
+static struct timer_list tx;
+static char re_schedule = 1;
+#ifdef ISICOM_DEBUG
+static unsigned long tx_count = 0;
+#endif
+
+static int ISILoad_ioctl(struct inode *inode, struct file *filp, unsigned  int cmd, unsigned long arg);
+
+static void isicom_tx(unsigned long _data);
+static void isicom_start(struct tty_struct * tty);
+
+static unsigned char * tmp_buf;
+static DECLARE_MUTEX(tmp_buf_sem);
+
+/*   baud index mappings from linux defns to isi */
+
+static signed char linuxb_to_isib[] = {
+	-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 16, 17,     
+	18, 19
+};
+
+struct	isi_board {
+	unsigned short		base;
+	unsigned char		irq;
+	unsigned char		port_count;
+	unsigned short		status;
+	unsigned short		port_status; /* each bit represents a single port */
+	unsigned short		shift_count;
+	struct isi_port		* ports;
+	signed char		count;
+	unsigned char		isa;
+	spinlock_t		card_lock; /* Card wide lock 11/5/00 -sameer */
+	unsigned long		flags;
+};
+
+struct	isi_port {
+	unsigned short		magic;
+	unsigned int		flags;
+	int			count;
+	int			blocked_open;
+	int			close_delay;
+	unsigned short		channel;
+	unsigned short		status;
+	unsigned short		closing_wait;
+	struct isi_board	* card;
+	struct tty_struct 	* tty;
+	wait_queue_head_t	close_wait;
+	wait_queue_head_t	open_wait;
+	struct work_struct	hangup_tq;
+	struct work_struct	bh_tqueue;
+	unsigned char		* xmit_buf;
+	int			xmit_head;
+	int			xmit_tail;
+	int			xmit_cnt;
+};
+
+static struct isi_board isi_card[BOARD_COUNT];
+static struct isi_port  isi_ports[PORT_COUNT];
+
+/*
+ *	Locking functions for card level locking. We need to own both
+ *	the kernel lock for the card and have the card in a position that
+ *	it wants to talk.
+ */
+ 
+static int lock_card(struct isi_board *card)
+{
+	char		retries;
+	unsigned short base = card->base;
+
+	for (retries = 0; retries < 100; retries++) {
+		spin_lock_irqsave(&card->card_lock, card->flags);
+		if (inw(base + 0xe) & 0x1) {
+			return 1; 
+		} else {
+			spin_unlock_irqrestore(&card->card_lock, card->flags);
+			udelay(1000);   /* 1ms */
+		}
+	}
+	printk(KERN_WARNING "ISICOM: Failed to lock Card (0x%x)\n", card->base);
+	return 0;	/* Failed to aquire the card! */
+}
+
+static int lock_card_at_interrupt(struct isi_board *card)
+{
+	unsigned char		retries;
+	unsigned short 		base = card->base;
+
+	for (retries = 0; retries < 200; retries++) {
+		spin_lock_irqsave(&card->card_lock, card->flags);
+
+		if (inw(base + 0xe) & 0x1)
+			return 1; 
+		else
+			spin_unlock_irqrestore(&card->card_lock, card->flags);
+	}
+	/* Failing in interrupt is an acceptable event */
+	return 0;	/* Failed to aquire the card! */
+}
+
+static void unlock_card(struct isi_board *card)
+{
+	spin_unlock_irqrestore(&card->card_lock, card->flags);
+}
+
+/*
+ *  ISI Card specific ops ...
+ */
+ 
+static void raise_dtr(struct isi_port * port)
+{
+	struct isi_board * card = port->card;
+	unsigned short base = card->base;
+	unsigned char channel = port->channel;
+
+	if (!lock_card(card))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02 , base);
+	outw(0x0504, base);
+	InterruptTheCard(base);
+	port->status |= ISI_DTR;
+	unlock_card(card);
+}
+
+static inline void drop_dtr(struct isi_port * port)
+{	
+	struct isi_board * card = port->card;
+	unsigned short base = card->base;
+	unsigned char channel = port->channel;
+
+	if (!lock_card(card))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02 , base);
+	outw(0x0404, base);
+	InterruptTheCard(base);	
+	port->status &= ~ISI_DTR;
+	unlock_card(card);
+}
+
+static inline void raise_rts(struct isi_port * port)
+{
+	struct isi_board * card = port->card;
+	unsigned short base = card->base;
+	unsigned char channel = port->channel;
+
+	if (!lock_card(card))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02 , base);
+	outw(0x0a04, base);
+	InterruptTheCard(base);	
+	port->status |= ISI_RTS;
+	unlock_card(card);
+}
+static inline void drop_rts(struct isi_port * port)
+{
+	struct isi_board * card = port->card;
+	unsigned short base = card->base;
+	unsigned char channel = port->channel;
+
+	if (!lock_card(card))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02 , base);
+	outw(0x0804, base);
+	InterruptTheCard(base);	
+	port->status &= ~ISI_RTS;
+	unlock_card(card);
+}
+
+static inline void raise_dtr_rts(struct isi_port * port)
+{
+	struct isi_board * card = port->card;
+	unsigned short base = card->base;
+	unsigned char channel = port->channel;
+
+	if (!lock_card(card))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02 , base);
+	outw(0x0f04, base);
+	InterruptTheCard(base);
+	port->status |= (ISI_DTR | ISI_RTS);
+	unlock_card(card);
+}
+
+static void drop_dtr_rts(struct isi_port * port)
+{
+	struct isi_board * card = port->card;
+	unsigned short base = card->base;
+	unsigned char channel = port->channel;
+
+	if (!lock_card(card))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02 , base);
+	outw(0x0c04, base);
+	InterruptTheCard(base);	
+	port->status &= ~(ISI_RTS | ISI_DTR);
+	unlock_card(card);
+}
+
+static inline void kill_queue(struct isi_port * port, short queue)
+{
+	struct isi_board * card = port->card;
+	unsigned short base = card->base;
+	unsigned char channel = port->channel;
+
+	if (!lock_card(card))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02 , base);
+	outw((queue << 8) | 0x06, base);
+	InterruptTheCard(base);	
+	unlock_card(card);
+}
+
+
+/* 
+ *  Firmware loader driver specific routines. This needs to mostly die
+ *  and be replaced with request_firmware.
+ */
+
+static struct file_operations ISILoad_fops = {
+	.owner		= THIS_MODULE,
+	.ioctl		= ISILoad_ioctl,
+};
+
+static struct miscdevice isiloader_device = {
+	ISILOAD_MISC_MINOR, "isictl", &ISILoad_fops
+};
+
+ 
+static inline int WaitTillCardIsFree(unsigned short base)
+{
+	unsigned long count=0;
+	while( (!(inw(base+0xe) & 0x1)) && (count++ < 6000000));
+	if (inw(base+0xe)&0x1)  
+		return 0;
+	else
+		return 1;
+}
+
+static int ISILoad_ioctl(struct inode *inode, struct file *filp,
+		         unsigned int cmd, unsigned long arg)
+{
+	unsigned int card, i, j, signature, status, portcount = 0;
+	unsigned long t;
+	unsigned short word_count, base;
+	bin_frame frame;
+	void __user *argp = (void __user *)arg;
+	/* exec_record exec_rec; */
+	
+	if(get_user(card, (int __user *)argp))
+		return -EFAULT;
+		
+	if(card < 0 || card >= BOARD_COUNT)
+		return -ENXIO;
+		
+	base=isi_card[card].base;
+	
+	if(base==0)
+		return -ENXIO;	/* disabled or not used */
+	
+	switch(cmd) {
+		case MIOCTL_RESET_CARD:
+			if (!capable(CAP_SYS_ADMIN))
+				return -EPERM;
+			printk(KERN_DEBUG "ISILoad:Resetting Card%d at 0x%x ",card+1,base);
+								
+			inw(base+0x8);
+			
+			for(t=jiffies+HZ/100;time_before(jiffies, t););
+				
+			outw(0,base+0x8); /* Reset */
+			
+			for(j=1;j<=3;j++) {
+				for(t=jiffies+HZ;time_before(jiffies, t););
+				printk(".");
+			}	
+			signature=(inw(base+0x4)) & 0xff;	
+			if (isi_card[card].isa) {
+					
+				if (!(inw(base+0xe) & 0x1) || (inw(base+0x2))) {
+#ifdef ISICOM_DEBUG				
+					printk("\nbase+0x2=0x%x , base+0xe=0x%x",inw(base+0x2),inw(base+0xe));
+#endif				
+					printk("\nISILoad:ISA Card%d reset failure (Possible bad I/O Port Address 0x%x).\n",card+1,base);
+					return -EIO;					
+				}
+			}	
+			else {
+				portcount = inw(base+0x2);
+				if (!(inw(base+0xe) & 0x1) || ((portcount!=0) && (portcount!=4) && (portcount!=8))) {	
+#ifdef ISICOM_DEBUG
+					printk("\nbase+0x2=0x%x , base+0xe=0x%x",inw(base+0x2),inw(base+0xe));
+#endif
+					printk("\nISILoad:PCI Card%d reset failure (Possible bad I/O Port Address 0x%x).\n",card+1,base);
+					return -EIO;
+				}
+			}	
+			switch(signature) {
+			case	0xa5:
+			case	0xbb:
+			case	0xdd:	
+					if (isi_card[card].isa) 
+						isi_card[card].port_count = 8;
+					else {
+						if (portcount == 4)
+							isi_card[card].port_count = 4;
+						else
+							isi_card[card].port_count = 8;
+					}	
+				     	isi_card[card].shift_count = 12;
+				     	break;
+				        
+			case	0xcc:	isi_card[card].port_count = 16;
+					isi_card[card].shift_count = 11;
+					break;  			
+					
+			default: printk("ISILoad:Card%d reset failure (Possible bad I/O Port Address 0x%x).\n",card+1,base);
+#ifdef ISICOM_DEBUG			
+				 printk("Sig=0x%x\n",signature);
+#endif				 
+				 return -EIO;
+			}
+			printk("-Done\n");
+			return put_user(signature,(unsigned __user *)argp);
+						
+	case	MIOCTL_LOAD_FIRMWARE:
+			if (!capable(CAP_SYS_ADMIN))
+				return -EPERM;
+				
+			if(copy_from_user(&frame, argp, sizeof(bin_frame)))
+				return -EFAULT;
+			
+			if (WaitTillCardIsFree(base))
+				return -EIO;
+			
+			outw(0xf0,base);	/* start upload sequence */ 
+			outw(0x00,base);
+			outw((frame.addr), base);/*      lsb of adderess    */
+			
+			word_count=(frame.count >> 1) + frame.count % 2;
+			outw(word_count, base);
+			InterruptTheCard(base);
+			
+			for(i=0;i<=0x2f;i++);	/* a wee bit of delay */
+			
+			if (WaitTillCardIsFree(base)) 
+				return -EIO;
+				
+			if ((status=inw(base+0x4))!=0) {
+				printk(KERN_WARNING "ISILoad:Card%d rejected load header:\nAddress:0x%x \nCount:0x%x \nStatus:0x%x \n", 
+				card+1, frame.addr, frame.count, status);
+				return -EIO;
+			}
+			outsw(base, (void *) frame.bin_data, word_count);
+			
+			InterruptTheCard(base);
+			
+			for(i=0;i<=0x0f;i++);	/* another wee bit of delay */ 
+			
+			if (WaitTillCardIsFree(base)) 
+				return -EIO;
+				
+			if ((status=inw(base+0x4))!=0) {
+				printk(KERN_ERR "ISILoad:Card%d got out of sync.Card Status:0x%x\n",card+1, status);
+				return -EIO;
+			}	
+			return 0;
+						
+	case	MIOCTL_READ_FIRMWARE:
+			if (!capable(CAP_SYS_ADMIN))
+				return -EPERM;
+				
+			if(copy_from_user(&frame, argp, sizeof(bin_header)))
+				return -EFAULT;
+			
+			if (WaitTillCardIsFree(base))
+				return -EIO;
+			
+			outw(0xf1,base);	/* start download sequence */ 
+			outw(0x00,base);
+			outw((frame.addr), base);/*      lsb of adderess    */
+			
+			word_count=(frame.count >> 1) + frame.count % 2;
+			outw(word_count+1, base);
+			InterruptTheCard(base);
+			
+			for(i=0;i<=0xf;i++);	/* a wee bit of delay */
+			
+			if (WaitTillCardIsFree(base)) 
+				return -EIO;
+				
+			if ((status=inw(base+0x4))!=0) {
+				printk(KERN_WARNING "ISILoad:Card%d rejected verify header:\nAddress:0x%x \nCount:0x%x \nStatus:0x%x \n", 
+				card+1, frame.addr, frame.count, status);
+				return -EIO;
+			}
+			
+			inw(base);
+			insw(base, frame.bin_data, word_count);
+			InterruptTheCard(base);
+			
+			for(i=0;i<=0x0f;i++);	/* another wee bit of delay */ 
+			
+			if (WaitTillCardIsFree(base)) 
+				return -EIO;
+				
+			if ((status=inw(base+0x4))!=0) {
+				printk(KERN_ERR "ISILoad:Card%d verify got out of sync.Card Status:0x%x\n",card+1, status);
+				return -EIO;
+			}	
+			
+			if(copy_to_user(argp, &frame, sizeof(bin_frame)))
+				return -EFAULT;
+			return 0;
+	
+	case	MIOCTL_XFER_CTRL:
+			if (!capable(CAP_SYS_ADMIN))
+				return -EPERM;
+			if (WaitTillCardIsFree(base)) 
+				return -EIO;
+					
+			outw(0xf2, base);
+			outw(0x800, base);
+			outw(0x0, base);
+			outw(0x0, base);
+			InterruptTheCard(base);
+			outw(0x0, base+0x4);    /* for ISI4608 cards */
+							
+			isi_card[card].status |= FIRMWARE_LOADED;
+			return 0;	
+			
+	default:
+#ifdef ISICOM_DEBUG	
+		printk(KERN_DEBUG "ISILoad: Received Ioctl cmd 0x%x.\n", cmd); 
+#endif
+		return -ENOIOCTLCMD;
+	
+	}
+	
+}
+		        	
+
+/*
+ *	ISICOM Driver specific routines ...
+ *
+ */
+ 
+static inline int isicom_paranoia_check(struct isi_port const * port, char *name, 
+					const char * routine)
+{
+#ifdef ISICOM_DEBUG 
+	static const char * badmagic = 
+			KERN_WARNING "ISICOM: Warning: bad isicom magic for dev %s in %s.\n";
+	static const char * badport = 
+			KERN_WARNING "ISICOM: Warning: NULL isicom port for dev %s in %s.\n";		
+	if (!port) {
+		printk(badport, name, routine);
+		return 1;
+	}
+	if (port->magic != ISICOM_MAGIC) {
+		printk(badmagic, name, routine);
+		return 1;
+	}	
+#endif	
+	return 0;
+}
+			
+/*
+ *	Transmitter. 
+ *
+ *	We shovel data into the card buffers on a regular basis. The card
+ *	will do the rest of the work for us.
+ */
+
+static void isicom_tx(unsigned long _data)
+{
+	short count = (BOARD_COUNT-1), card, base;
+	short txcount, wrd, residue, word_count, cnt;
+	struct isi_port * port;
+	struct tty_struct * tty;
+	
+#ifdef ISICOM_DEBUG
+	++tx_count;
+#endif	
+	
+	/*	find next active board	*/
+	card = (prev_card + 1) & 0x0003;
+	while(count-- > 0) {
+		if (isi_card[card].status & BOARD_ACTIVE) 
+			break;
+		card = (card + 1) & 0x0003;	
+	}
+	if (!(isi_card[card].status & BOARD_ACTIVE))
+		goto sched_again;
+		
+	prev_card = card;
+	
+	count = isi_card[card].port_count;
+	port = isi_card[card].ports;
+	base = isi_card[card].base;
+	for (;count > 0;count--, port++) {
+		if (!lock_card_at_interrupt(&isi_card[card]))
+			continue;
+		/* port not active or tx disabled to force flow control */
+		if (!(port->flags & ASYNC_INITIALIZED) ||
+		 	!(port->status & ISI_TXOK))
+			unlock_card(&isi_card[card]);
+			continue;
+		
+		tty = port->tty;
+		
+		
+		if(tty == NULL) {
+			unlock_card(&isi_card[card]);
+			continue;
+		}
+		
+		txcount = min_t(short, TX_SIZE, port->xmit_cnt);
+		if (txcount <= 0 || tty->stopped || tty->hw_stopped) {
+			unlock_card(&isi_card[card]);
+			continue;
+		}
+		if (!(inw(base + 0x02) & (1 << port->channel))) {
+			unlock_card(&isi_card[card]);
+			continue;		
+		}
+#ifdef ISICOM_DEBUG
+		printk(KERN_DEBUG "ISICOM: txing %d bytes, port%d.\n", 
+				txcount, port->channel+1); 
+#endif	
+		outw((port->channel << isi_card[card].shift_count) | txcount
+					, base);
+		residue = NO;
+		wrd = 0;			
+		while (1) {
+			cnt = min_t(int, txcount, (SERIAL_XMIT_SIZE - port->xmit_tail));
+			if (residue == YES) {
+				residue = NO;
+				if (cnt > 0) {
+					wrd |= (port->xmit_buf[port->xmit_tail] << 8);
+					port->xmit_tail = (port->xmit_tail + 1) & (SERIAL_XMIT_SIZE - 1);
+					port->xmit_cnt--;
+					txcount--;
+					cnt--;
+					outw(wrd, base);			
+				}
+				else {
+					outw(wrd, base);
+					break;
+				}
+			}		
+			if (cnt <= 0) break;
+			word_count = cnt >> 1;
+			outsw(base, port->xmit_buf+port->xmit_tail, word_count);
+			port->xmit_tail = (port->xmit_tail + (word_count << 1)) &
+						(SERIAL_XMIT_SIZE - 1);
+			txcount -= (word_count << 1);
+			port->xmit_cnt -= (word_count << 1);
+			if (cnt & 0x0001) {
+				residue = YES;
+				wrd = port->xmit_buf[port->xmit_tail];
+				port->xmit_tail = (port->xmit_tail + 1) & (SERIAL_XMIT_SIZE - 1);
+				port->xmit_cnt--;
+				txcount--;
+			}
+		}
+
+		InterruptTheCard(base);
+		if (port->xmit_cnt <= 0)
+			port->status &= ~ISI_TXOK;
+		if (port->xmit_cnt <= WAKEUP_CHARS)
+			schedule_work(&port->bh_tqueue);
+		unlock_card(&isi_card[card]);
+	}	
+
+	/*	schedule another tx for hopefully in about 10ms	*/	
+sched_again:	
+	if (!re_schedule)	
+		return;
+	init_timer(&tx);
+	tx.expires = jiffies + HZ/100;
+	tx.data = 0;
+	tx.function = isicom_tx;
+	add_timer(&tx);
+	
+	return;	
+}		
+ 
+/* 	Interrupt handlers 	*/
+
+ 
+static void isicom_bottomhalf(void * data)
+{
+	struct isi_port * port = (struct isi_port *) data;
+	struct tty_struct * tty = port->tty;
+	
+	if (!tty)
+		return;
+
+	tty_wakeup(tty);	
+	wake_up_interruptible(&tty->write_wait);
+} 		
+ 		
+/*
+ *	Main interrupt handler routine 
+ */
+ 
+static irqreturn_t isicom_interrupt(int irq, void *dev_id,
+					struct pt_regs *regs)
+{
+	struct isi_board * card;
+	struct isi_port * port;
+	struct tty_struct * tty;
+	unsigned short base, header, word_count, count;
+	unsigned char channel;
+	short byte_count;
+	
+	card = (struct isi_board *) dev_id;
+
+	if (!card || !(card->status & FIRMWARE_LOADED))
+		return IRQ_NONE;
+	
+	base = card->base;
+	spin_lock(&card->card_lock);
+	
+	if (card->isa == NO) {
+		/*
+		 *      disable any interrupts from the PCI card and lower the
+		 *      interrupt line
+		 */
+		outw(0x8000, base+0x04);
+		ClearInterrupt(base);
+	}
+	
+	inw(base);		/* get the dummy word out */
+	header = inw(base);
+	channel = (header & 0x7800) >> card->shift_count;
+	byte_count = header & 0xff;
+
+	if (channel + 1 > card->port_count) {
+		printk(KERN_WARNING "ISICOM: isicom_interrupt(0x%x): %d(channel) > port_count.\n",
+				base, channel+1);
+		if (card->isa)
+			ClearInterrupt(base);
+		else
+			outw(0x0000, base+0x04); /* enable interrupts */		
+		spin_unlock(&card->card_lock);
+		return IRQ_HANDLED;			
+	}
+	port = card->ports + channel;
+	if (!(port->flags & ASYNC_INITIALIZED)) {
+		if (card->isa)
+			ClearInterrupt(base);
+		else
+			outw(0x0000, base+0x04); /* enable interrupts */
+		return IRQ_HANDLED;
+	}	
+		
+	tty = port->tty;
+	if (tty == NULL) {
+		word_count = byte_count >> 1;
+		while(byte_count > 1) {
+			inw(base);
+			byte_count -= 2;
+		}
+		if (byte_count & 0x01)
+			inw(base);
+		if (card->isa == YES)
+			ClearInterrupt(base);
+		else
+			outw(0x0000, base+0x04); /* enable interrupts */
+		spin_unlock(&card->card_lock);
+		return IRQ_HANDLED;
+	}
+	
+	if (header & 0x8000) {		/* Status Packet */
+		header = inw(base);
+		switch(header & 0xff) {
+			case 0:	/* Change in EIA signals */
+				
+				if (port->flags & ASYNC_CHECK_CD) {
+					if (port->status & ISI_DCD) {
+						if (!(header & ISI_DCD)) {
+						/* Carrier has been lost  */
+#ifdef ISICOM_DEBUG						
+							printk(KERN_DEBUG "ISICOM: interrupt: DCD->low.\n");
+#endif							
+							port->status &= ~ISI_DCD;
+							schedule_work(&port->hangup_tq);
+						}
+					}
+					else {
+						if (header & ISI_DCD) {
+						/* Carrier has been detected */
+#ifdef ISICOM_DEBUG
+							printk(KERN_DEBUG "ISICOM: interrupt: DCD->high.\n");
+#endif							
+							port->status |= ISI_DCD;
+							wake_up_interruptible(&port->open_wait);
+						}
+					}
+				}
+				else {
+					if (header & ISI_DCD) 
+						port->status |= ISI_DCD;
+					else
+						port->status &= ~ISI_DCD;
+				}	
+				
+				if (port->flags & ASYNC_CTS_FLOW) {
+					if (port->tty->hw_stopped) {
+						if (header & ISI_CTS) {
+							port->tty->hw_stopped = 0;
+							/* start tx ing */
+							port->status |= (ISI_TXOK | ISI_CTS);
+							schedule_work(&port->bh_tqueue);
+						}
+					}
+					else {
+						if (!(header & ISI_CTS)) {
+							port->tty->hw_stopped = 1;
+							/* stop tx ing */
+							port->status &= ~(ISI_TXOK | ISI_CTS);
+						}
+					}
+				}
+				else {
+					if (header & ISI_CTS) 
+						port->status |= ISI_CTS;
+					else
+						port->status &= ~ISI_CTS;
+				}
+				
+				if (header & ISI_DSR) 
+					port->status |= ISI_DSR;
+				else
+					port->status &= ~ISI_DSR;
+				
+				if (header & ISI_RI) 
+					port->status |= ISI_RI;
+				else
+					port->status &= ~ISI_RI;						
+				
+				break;
+				
+			case 1:	/* Received Break !!!	 */
+				if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+					break;
+				*tty->flip.flag_buf_ptr++ = TTY_BREAK;
+				*tty->flip.char_buf_ptr++ = 0;
+				tty->flip.count++;
+				if (port->flags & ASYNC_SAK)
+					do_SAK(tty);
+				schedule_delayed_work(&tty->flip.work, 1);
+				break;
+				
+			case 2:	/* Statistics		 */
+				printk(KERN_DEBUG "ISICOM: isicom_interrupt: stats!!!.\n");			
+				break;
+				
+			default:
+				printk(KERN_WARNING "ISICOM: Intr: Unknown code in status packet.\n");
+				break;
+		}	 
+	}
+	else {				/* Data   Packet */
+		count = min_t(unsigned short, byte_count, (TTY_FLIPBUF_SIZE - tty->flip.count));
+#ifdef ISICOM_DEBUG
+		printk(KERN_DEBUG "ISICOM: Intr: Can rx %d of %d bytes.\n", 
+					count, byte_count);
+#endif			
+		word_count = count >> 1;
+		insw(base, tty->flip.char_buf_ptr, word_count);
+		tty->flip.char_buf_ptr += (word_count << 1);		
+		byte_count -= (word_count << 1);
+		if (count & 0x0001) {
+			*tty->flip.char_buf_ptr++ = (char)(inw(base) & 0xff);
+			byte_count -= 2;
+		}	
+		memset(tty->flip.flag_buf_ptr, 0, count);
+		tty->flip.flag_buf_ptr += count;
+		tty->flip.count += count;
+		
+		if (byte_count > 0) {
+			printk(KERN_DEBUG "ISICOM: Intr(0x%x:%d): Flip buffer overflow! dropping bytes...\n",
+					base, channel+1);
+			while(byte_count > 0) { /* drain out unread xtra data */
+				inw(base);
+				byte_count -= 2;
+			}
+		}
+		schedule_delayed_work(&tty->flip.work, 1);
+	}
+	if (card->isa == YES)
+		ClearInterrupt(base);
+	else
+		outw(0x0000, base+0x04); /* enable interrupts */	
+	return IRQ_HANDLED;
+} 
+
+static void isicom_config_port(struct isi_port * port)
+{
+	struct isi_board * card = port->card;
+	struct tty_struct * tty;
+	unsigned long baud;
+	unsigned short channel_setup, base = card->base;
+	unsigned short channel = port->channel, shift_count = card->shift_count;
+	unsigned char flow_ctrl;
+	
+	if (!(tty = port->tty) || !tty->termios)
+		return;
+	baud = C_BAUD(tty);
+	if (baud & CBAUDEX) {
+		baud &= ~CBAUDEX;
+		
+		/*  if CBAUDEX bit is on and the baud is set to either 50 or 75
+		 *  then the card is programmed for 57.6Kbps or 115Kbps
+		 *  respectively.
+		 */   
+		 
+		if (baud < 1 || baud > 2)
+			port->tty->termios->c_cflag &= ~CBAUDEX;
+		else
+			baud += 15;
+	}	
+	if (baud == 15) {
+	
+		/*  the ASYNC_SPD_HI and ASYNC_SPD_VHI options are set 
+		 *  by the set_serial_info ioctl ... this is done by
+		 *  the 'setserial' utility.
+		 */  
+			
+		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+			baud++;     /*  57.6 Kbps */
+		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+			baud +=2;   /*  115  Kbps */	 
+	}
+	if (linuxb_to_isib[baud] == -1) {
+		/* hang up */
+	 	drop_dtr(port);
+	 	return;
+	}	
+	else  
+		raise_dtr(port);
+		
+	if (lock_card(card)) {
+		outw(0x8000 | (channel << shift_count) |0x03, base);
+		outw(linuxb_to_isib[baud] << 8 | 0x03, base);
+		channel_setup = 0;
+		switch(C_CSIZE(tty)) {
+			case CS5:
+				channel_setup |= ISICOM_CS5;
+				break;
+			case CS6:
+				channel_setup |= ISICOM_CS6;
+				break;
+			case CS7:
+				channel_setup |= ISICOM_CS7;
+				break;
+			case CS8:
+				channel_setup |= ISICOM_CS8;
+				break;
+		}
+			
+		if (C_CSTOPB(tty))
+			channel_setup |= ISICOM_2SB;
+		if (C_PARENB(tty)) {
+			channel_setup |= ISICOM_EVPAR;
+			if (C_PARODD(tty))
+				channel_setup |= ISICOM_ODPAR;	
+		}
+		outw(channel_setup, base);	
+		InterruptTheCard(base);
+		unlock_card(card);	
+	}	
+	if (C_CLOCAL(tty))
+		port->flags &= ~ASYNC_CHECK_CD;
+	else
+		port->flags |= ASYNC_CHECK_CD;	
+	
+	/* flow control settings ...*/
+	flow_ctrl = 0;
+	port->flags &= ~ASYNC_CTS_FLOW;
+	if (C_CRTSCTS(tty)) {
+		port->flags |= ASYNC_CTS_FLOW;
+		flow_ctrl |= ISICOM_CTSRTS;
+	}	
+	if (I_IXON(tty))	
+		flow_ctrl |= ISICOM_RESPOND_XONXOFF;
+	if (I_IXOFF(tty))
+		flow_ctrl |= ISICOM_INITIATE_XONXOFF;	
+		
+	if (lock_card(card)) {
+		outw(0x8000 | (channel << shift_count) |0x04, base);
+		outw(flow_ctrl << 8 | 0x05, base);
+		outw((STOP_CHAR(tty)) << 8 | (START_CHAR(tty)), base);
+		InterruptTheCard(base);
+		unlock_card(card);
+	}
+	
+	/*	rx enabled -> enable port for rx on the card	*/
+	if (C_CREAD(tty)) {
+		card->port_status |= (1 << channel);
+		outw(card->port_status, base + 0x02);
+	}
+}
+ 
+/* open et all */ 
+
+static inline void isicom_setup_board(struct isi_board * bp)
+{
+	int channel;
+	struct isi_port * port;
+	unsigned long flags;
+	
+	spin_lock_irqsave(&bp->card_lock, flags);
+	if (bp->status & BOARD_ACTIVE) {
+		spin_unlock_irqrestore(&bp->card_lock, flags);
+		return;
+	}
+	port = bp->ports;
+	bp->status |= BOARD_ACTIVE;
+	spin_unlock_irqrestore(&bp->card_lock, flags);
+	for(channel = 0; channel < bp->port_count; channel++, port++)
+		drop_dtr_rts(port);
+	return;
+}
+ 
+static int isicom_setup_port(struct isi_port * port)
+{
+	struct isi_board * card = port->card;
+	unsigned long flags;
+	
+	if (port->flags & ASYNC_INITIALIZED) {
+		return 0;
+	}
+	if (!port->xmit_buf) {
+		unsigned long page;
+		
+		if (!(page = get_zeroed_page(GFP_KERNEL)))
+			return -ENOMEM;
+		
+		if (port->xmit_buf) {
+			free_page(page);
+			return -ERESTARTSYS;
+		}
+		port->xmit_buf = (unsigned char *) page;	
+	}	
+
+	spin_lock_irqsave(&card->card_lock, flags);
+	if (port->tty)
+		clear_bit(TTY_IO_ERROR, &port->tty->flags);
+	if (port->count == 1)
+		card->count++;
+		
+	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+	
+	/*	discard any residual data	*/
+	kill_queue(port, ISICOM_KILLTX | ISICOM_KILLRX);
+	
+	isicom_config_port(port);
+	port->flags |= ASYNC_INITIALIZED;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	
+	return 0;		
+} 
+ 
+static int block_til_ready(struct tty_struct * tty, struct file * filp, struct isi_port * port) 
+{
+	struct isi_board * card = port->card;
+	int do_clocal = 0, retval;
+	unsigned long flags;
+	DECLARE_WAITQUEUE(wait, current);
+
+	/* block if port is in the process of being closed */
+
+	if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
+#ifdef ISICOM_DEBUG	
+		printk(KERN_DEBUG "ISICOM: block_til_ready: close in progress.\n");
+#endif		
+		interruptible_sleep_on(&port->close_wait);
+		if (port->flags & ASYNC_HUP_NOTIFY)
+			return -EAGAIN;
+		else
+			return -ERESTARTSYS;
+	}
+	
+	/* if non-blocking mode is set ... */
+	
+	if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) {
+#ifdef ISICOM_DEBUG	
+		printk(KERN_DEBUG "ISICOM: block_til_ready: non-block mode.\n");
+#endif		
+		port->flags |= ASYNC_NORMAL_ACTIVE;
+		return 0;	
+	}	
+	
+	if (C_CLOCAL(tty))
+		do_clocal = 1;
+	
+	/* block waiting for DCD to be asserted, and while 
+						callout dev is busy */
+	retval = 0;
+	add_wait_queue(&port->open_wait, &wait);
+
+	spin_lock_irqsave(&card->card_lock, flags);
+	if (!tty_hung_up_p(filp))
+		port->count--;
+	port->blocked_open++;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	
+	while (1) {
+		raise_dtr_rts(port);
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) { 	
+			if (port->flags & ASYNC_HUP_NOTIFY)
+				retval = -EAGAIN;
+			else
+				retval = -ERESTARTSYS;
+			break;
+		}	
+		if (!(port->flags & ASYNC_CLOSING) &&
+		    (do_clocal || (port->status & ISI_DCD))) {
+			break;
+		}	
+		if (signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+		schedule();		
+	}
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(&port->open_wait, &wait);
+	spin_lock_irqsave(&card->card_lock, flags);
+	if (!tty_hung_up_p(filp))
+		port->count++;
+	port->blocked_open--;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	if (retval)
+		return retval;
+	port->flags |= ASYNC_NORMAL_ACTIVE;
+	return 0;
+}
+ 
+static int isicom_open(struct tty_struct * tty, struct file * filp)
+{
+	struct isi_port * port;
+	struct isi_board * card;
+	unsigned int line, board;
+	int error;
+
+	line = tty->index;
+	if (line < 0 || line > PORT_COUNT-1)
+		return -ENODEV;
+	board = BOARD(line);
+	card = &isi_card[board];
+	
+	if (!(card->status & FIRMWARE_LOADED))
+		return -ENODEV;
+	
+	/*  open on a port greater than the port count for the card !!! */
+	if (line > ((board * 16) + card->port_count - 1))
+		return -ENODEV;
+
+	port = &isi_ports[line];	
+	if (isicom_paranoia_check(port, tty->name, "isicom_open"))
+		return -ENODEV;
+		
+	isicom_setup_board(card);		
+	
+	port->count++;
+	tty->driver_data = port;
+	port->tty = tty;
+	if ((error = isicom_setup_port(port))!=0)
+		return error;
+	if ((error = block_til_ready(tty, filp, port))!=0)
+		return error;
+
+	return 0;      		
+}
+ 
+/* close et all */
+
+static inline void isicom_shutdown_board(struct isi_board * bp)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&bp->card_lock, flags);
+	if (bp->status & BOARD_ACTIVE) {
+		bp->status &= ~BOARD_ACTIVE;
+	}
+	spin_unlock_irqrestore(&bp->card_lock, flags);
+}
+
+static void isicom_shutdown_port(struct isi_port * port)
+{
+	struct isi_board * card = port->card;
+	struct tty_struct * tty;	
+	unsigned long flags;
+	
+	tty = port->tty;
+
+	spin_lock_irqsave(&card->card_lock, flags);	
+	if (!(port->flags & ASYNC_INITIALIZED)) {
+		spin_unlock_irqrestore(&card->card_lock, flags);
+		return;
+	}
+	if (port->xmit_buf) {
+		free_page((unsigned long) port->xmit_buf);
+		port->xmit_buf = NULL;
+	}	
+	port->flags &= ~ASYNC_INITIALIZED;
+	/* 3rd October 2000 : Vinayak P Risbud */
+	port->tty = NULL;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	
+	/*Fix done by Anil .S on 30-04-2001
+	remote login through isi port has dtr toggle problem
+	due to which the carrier drops before the password prompt
+	appears on the remote end. Now we drop the dtr only if the 
+	HUPCL(Hangup on close) flag is set for the tty*/
+	
+	if (C_HUPCL(tty)) 
+		/* drop dtr on this port */
+		drop_dtr(port);
+		
+	/* any other port uninits  */ 
+	if (tty)
+		set_bit(TTY_IO_ERROR, &tty->flags);
+	
+	if (--card->count < 0) {
+		printk(KERN_DEBUG "ISICOM: isicom_shutdown_port: bad board(0x%x) count %d.\n",
+			card->base, card->count);
+		card->count = 0;	
+	}
+	
+	/* last port was closed , shutdown that boad too */
+	if(C_HUPCL(tty)) {
+		if (!card->count)
+			isicom_shutdown_board(card);
+	}
+}
+
+static void isicom_close(struct tty_struct * tty, struct file * filp)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	struct isi_board * card = port->card;
+	unsigned long flags;
+	
+	if (!port)
+		return;
+	if (isicom_paranoia_check(port, tty->name, "isicom_close"))
+		return;
+	
+#ifdef ISICOM_DEBUG		
+	printk(KERN_DEBUG "ISICOM: Close start!!!.\n");
+#endif	
+	
+	spin_lock_irqsave(&card->card_lock, flags);
+	if (tty_hung_up_p(filp)) {
+		spin_unlock_irqrestore(&card->card_lock, flags);
+		return;
+	}
+	
+	if (tty->count == 1 && port->count != 1) {
+		printk(KERN_WARNING "ISICOM:(0x%x) isicom_close: bad port count"
+			"tty->count = 1	port count = %d.\n",
+			card->base, port->count);
+		port->count = 1;
+	}
+	if (--port->count < 0) {
+		printk(KERN_WARNING "ISICOM:(0x%x) isicom_close: bad port count for"
+			"channel%d = %d", card->base, port->channel, 
+			port->count);
+		port->count = 0;	
+	}
+	
+	if (port->count) {
+		spin_unlock_irqrestore(&card->card_lock, flags);
+		return;
+	} 	
+	port->flags |= ASYNC_CLOSING;
+	tty->closing = 1;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	
+	if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+		tty_wait_until_sent(tty, port->closing_wait);
+	/* indicate to the card that no more data can be received 
+	   on this port */
+	spin_lock_irqsave(&card->card_lock, flags);
+	if (port->flags & ASYNC_INITIALIZED) {   
+		card->port_status &= ~(1 << port->channel);
+		outw(card->port_status, card->base + 0x02);
+	}	
+	isicom_shutdown_port(port);
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	
+	if (tty->driver->flush_buffer)
+		tty->driver->flush_buffer(tty);
+	tty_ldisc_flush(tty);
+
+	spin_lock_irqsave(&card->card_lock, flags);
+	tty->closing = 0;
+
+	if (port->blocked_open) {
+		spin_unlock_irqrestore(&card->card_lock, flags);
+		if (port->close_delay) {
+#ifdef ISICOM_DEBUG			
+			printk(KERN_DEBUG "ISICOM: scheduling until time out.\n");
+#endif			
+			msleep_interruptible(jiffies_to_msecs(port->close_delay));
+		}
+		spin_lock_irqsave(&card->card_lock, flags);
+		wake_up_interruptible(&port->open_wait);
+	}	
+	port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
+	wake_up_interruptible(&port->close_wait);
+	spin_unlock_irqrestore(&card->card_lock, flags);
+}
+
+/* write et all */
+static int isicom_write(struct tty_struct * tty,
+			const unsigned char * buf, int count)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	struct isi_board * card = port->card;
+	unsigned long flags;
+	int cnt, total = 0;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_write"))
+		return 0;
+	
+	if (!tty || !port->xmit_buf || !tmp_buf)
+		return 0;
+		
+	spin_lock_irqsave(&card->card_lock, flags);
+	
+	while(1) {	
+		cnt = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
+					    SERIAL_XMIT_SIZE - port->xmit_head));
+		if (cnt <= 0) 
+			break;
+		
+		memcpy(port->xmit_buf + port->xmit_head, buf, cnt);
+		port->xmit_head = (port->xmit_head + cnt) & (SERIAL_XMIT_SIZE - 1);
+		port->xmit_cnt += cnt;
+		buf += cnt;
+		count -= cnt;
+		total += cnt;
+	}		
+	if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped)
+		port->status |= ISI_TXOK;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	return total;	
+}
+
+/* put_char et all */
+static void isicom_put_char(struct tty_struct * tty, unsigned char ch)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	struct isi_board * card = port->card;
+	unsigned long flags;
+	
+	if (isicom_paranoia_check(port, tty->name, "isicom_put_char"))
+		return;
+	
+	if (!tty || !port->xmit_buf)
+		return;
+
+	spin_lock_irqsave(&card->card_lock, flags);
+	if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
+		spin_unlock_irqrestore(&card->card_lock, flags);
+		return;
+	}
+	
+	port->xmit_buf[port->xmit_head++] = ch;
+	port->xmit_head &= (SERIAL_XMIT_SIZE - 1);
+	port->xmit_cnt++;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+}
+
+/* flush_chars et all */
+static void isicom_flush_chars(struct tty_struct * tty)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	
+	if (isicom_paranoia_check(port, tty->name, "isicom_flush_chars"))
+		return;
+	
+	if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || !port->xmit_buf)
+		return;
+		
+	/* this tells the transmitter to consider this port for
+	   data output to the card ... that's the best we can do. */
+	port->status |= ISI_TXOK;	
+}
+
+/* write_room et all */
+static int isicom_write_room(struct tty_struct * tty)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	int free;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_write_room"))
+		return 0;
+	
+	free = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
+	if (free < 0)
+		free = 0;
+	return free;
+}
+
+/* chars_in_buffer et all */
+static int isicom_chars_in_buffer(struct tty_struct * tty)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	if (isicom_paranoia_check(port, tty->name, "isicom_chars_in_buffer"))
+		return 0;
+	return port->xmit_cnt;
+}
+
+/* ioctl et all */
+static inline void isicom_send_break(struct isi_port * port, unsigned long length)
+{
+	struct isi_board * card = port->card;
+	unsigned short base = card->base;	
+	
+	if(!lock_card(card))
+		return;
+		
+	outw(0x8000 | ((port->channel) << (card->shift_count)) | 0x3, base);
+	outw((length & 0xff) << 8 | 0x00, base);
+	outw((length & 0xff00), base);
+	InterruptTheCard(base);
+
+	unlock_card(card);
+}
+
+static int isicom_tiocmget(struct tty_struct *tty, struct file *file)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	/* just send the port status */
+	unsigned short status = port->status;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+		return -ENODEV;
+	
+	return  ((status & ISI_RTS) ? TIOCM_RTS : 0) |
+		((status & ISI_DTR) ? TIOCM_DTR : 0) |
+		((status & ISI_DCD) ? TIOCM_CAR : 0) |
+		((status & ISI_DSR) ? TIOCM_DSR : 0) |
+		((status & ISI_CTS) ? TIOCM_CTS : 0) |
+		((status & ISI_RI ) ? TIOCM_RI  : 0);
+}
+
+static int isicom_tiocmset(struct tty_struct *tty, struct file *file,
+			   unsigned int set, unsigned int clear)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	
+	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+		return -ENODEV;
+	
+	if (set & TIOCM_RTS)
+		raise_rts(port);
+	if (set & TIOCM_DTR)
+		raise_dtr(port);
+
+	if (clear & TIOCM_RTS)
+		drop_rts(port);
+	if (clear & TIOCM_DTR)
+		drop_dtr(port);
+
+	return 0;
+}			
+
+static int isicom_set_serial_info(struct isi_port * port,
+					struct serial_struct __user *info)
+{
+	struct serial_struct newinfo;
+	int reconfig_port;
+
+	if(copy_from_user(&newinfo, info, sizeof(newinfo)))
+		return -EFAULT;
+		
+	reconfig_port = ((port->flags & ASYNC_SPD_MASK) != 
+			 (newinfo.flags & ASYNC_SPD_MASK));
+	
+	if (!capable(CAP_SYS_ADMIN)) {
+		if ((newinfo.close_delay != port->close_delay) ||
+		    (newinfo.closing_wait != port->closing_wait) ||
+		    ((newinfo.flags & ~ASYNC_USR_MASK) != 
+		     (port->flags & ~ASYNC_USR_MASK)))
+			return -EPERM;
+		port->flags = ((port->flags & ~ ASYNC_USR_MASK) |
+				(newinfo.flags & ASYNC_USR_MASK));
+	}	
+	else {
+		port->close_delay = newinfo.close_delay;
+		port->closing_wait = newinfo.closing_wait; 
+		port->flags = ((port->flags & ~ASYNC_FLAGS) | 
+				(newinfo.flags & ASYNC_FLAGS));
+	}
+	if (reconfig_port) {
+		isicom_config_port(port);
+	}
+	return 0;		 
+}		
+
+static int isicom_get_serial_info(struct isi_port * port, 
+					struct serial_struct __user *info)
+{
+	struct serial_struct out_info;
+	
+	memset(&out_info, 0, sizeof(out_info));
+/*	out_info.type = ? */
+	out_info.line = port - isi_ports;
+	out_info.port = port->card->base;
+	out_info.irq = port->card->irq;
+	out_info.flags = port->flags;
+/*	out_info.baud_base = ? */
+	out_info.close_delay = port->close_delay;
+	out_info.closing_wait = port->closing_wait;
+	if(copy_to_user(info, &out_info, sizeof(out_info)))
+		return -EFAULT;
+	return 0;
+}					
+
+static int isicom_ioctl(struct tty_struct * tty, struct file * filp,
+			unsigned int cmd, unsigned long arg) 
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	void __user *argp = (void __user *)arg;
+	int retval;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+		return -ENODEV;
+
+	switch(cmd) {
+		case TCSBRK:
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+			tty_wait_until_sent(tty, 0);
+			if (!arg)
+				isicom_send_break(port, HZ/4);
+			return 0;
+			
+		case TCSBRKP:	
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+			tty_wait_until_sent(tty, 0);
+			isicom_send_break(port, arg ? arg * (HZ/10) : HZ/4);
+			return 0;
+			
+		case TIOCGSOFTCAR:
+			return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *)argp);
+			
+		case TIOCSSOFTCAR:
+			if(get_user(arg, (unsigned long __user *) argp))
+				return -EFAULT;
+			tty->termios->c_cflag =
+				((tty->termios->c_cflag & ~CLOCAL) |
+				(arg ? CLOCAL : 0));
+			return 0;	
+			
+		case TIOCGSERIAL:
+			return isicom_get_serial_info(port, argp);
+		
+		case TIOCSSERIAL:
+			return isicom_set_serial_info(port, argp);
+					
+		default:
+			return -ENOIOCTLCMD;						
+	}
+	return 0;
+}
+
+/* set_termios et all */
+static void isicom_set_termios(struct tty_struct * tty, struct termios * old_termios)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	
+	if (isicom_paranoia_check(port, tty->name, "isicom_set_termios"))
+		return;
+	
+	if (tty->termios->c_cflag == old_termios->c_cflag &&
+	    tty->termios->c_iflag == old_termios->c_iflag)
+		return;
+		
+	isicom_config_port(port);
+	
+	if ((old_termios->c_cflag & CRTSCTS) &&
+	    !(tty->termios->c_cflag & CRTSCTS)) {	
+		tty->hw_stopped = 0;
+		isicom_start(tty);   
+	}    
+}
+
+/* throttle et all */
+static void isicom_throttle(struct tty_struct * tty)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	struct isi_board * card = port->card;
+	
+	if (isicom_paranoia_check(port, tty->name, "isicom_throttle"))
+		return;
+	
+	/* tell the card that this port cannot handle any more data for now */
+	card->port_status &= ~(1 << port->channel);
+	outw(card->port_status, card->base + 0x02);
+}
+
+/* unthrottle et all */
+static void isicom_unthrottle(struct tty_struct * tty)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	struct isi_board * card = port->card;
+	
+	if (isicom_paranoia_check(port, tty->name, "isicom_unthrottle"))
+		return;
+	
+	/* tell the card that this port is ready to accept more data */
+	card->port_status |= (1 << port->channel);
+	outw(card->port_status, card->base + 0x02);
+}
+
+/* stop et all */
+static void isicom_stop(struct tty_struct * tty)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_stop"))
+		return;
+	
+	/* this tells the transmitter not to consider this port for
+	   data output to the card. */
+	port->status &= ~ISI_TXOK;
+}
+
+/* start et all */
+static void isicom_start(struct tty_struct * tty)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	
+	if (isicom_paranoia_check(port, tty->name, "isicom_start"))
+		return;
+	
+	/* this tells the transmitter to consider this port for
+	   data output to the card. */
+	port->status |= ISI_TXOK;
+}
+
+/* hangup et all */
+static void do_isicom_hangup(void * data)
+{
+	struct isi_port * port = (struct isi_port *) data;
+	struct tty_struct * tty;
+	
+	tty = port->tty;
+	if (tty)
+		tty_hangup(tty);
+}
+
+static void isicom_hangup(struct tty_struct * tty)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	
+	if (isicom_paranoia_check(port, tty->name, "isicom_hangup"))
+		return;
+	
+	isicom_shutdown_port(port);
+	port->count = 0;
+	port->flags &= ~ASYNC_NORMAL_ACTIVE;
+	port->tty = NULL;
+	wake_up_interruptible(&port->open_wait);
+}
+
+/* flush_buffer et all */
+static void isicom_flush_buffer(struct tty_struct * tty)
+{
+	struct isi_port * port = (struct isi_port *) tty->driver_data;
+	struct isi_board * card = port->card;
+	unsigned long flags;
+	
+	if (isicom_paranoia_check(port, tty->name, "isicom_flush_buffer"))
+		return;
+	
+	spin_lock_irqsave(&card->card_lock, flags);
+	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	
+	wake_up_interruptible(&tty->write_wait);
+	tty_wakeup(tty);
+}
+
+
+static int __init register_ioregion(void)
+{
+	int count, done=0;
+	for (count=0; count < BOARD_COUNT; count++ ) {
+		if (isi_card[count].base)
+			if (!request_region(isi_card[count].base,16,ISICOM_NAME)) {
+				printk(KERN_DEBUG "ISICOM: I/O Region 0x%x-0x%x is busy. Card%d will be disabled.\n",
+					isi_card[count].base,isi_card[count].base+15,count+1);
+				isi_card[count].base=0;
+				done++;
+			}
+	}
+	return done;
+}
+
+static void __exit unregister_ioregion(void)
+{
+	int count;
+	for (count=0; count < BOARD_COUNT; count++ ) 
+		if (isi_card[count].base) {
+			release_region(isi_card[count].base,16);
+#ifdef ISICOM_DEBUG			
+			printk(KERN_DEBUG "ISICOM: I/O Region 0x%x-0x%x released for Card%d.\n",isi_card[count].base,isi_card[count].base+15,count+1);
+#endif			
+		}
+}
+
+static struct tty_operations isicom_ops = {
+	.open	= isicom_open,
+	.close	= isicom_close,
+	.write	= isicom_write,
+	.put_char	= isicom_put_char,
+	.flush_chars	= isicom_flush_chars,
+	.write_room	= isicom_write_room,
+	.chars_in_buffer	= isicom_chars_in_buffer,
+	.ioctl	= isicom_ioctl,
+	.set_termios	= isicom_set_termios,
+	.throttle	= isicom_throttle,
+	.unthrottle	= isicom_unthrottle,
+	.stop	= isicom_stop,
+	.start	= isicom_start,
+	.hangup	= isicom_hangup,
+	.flush_buffer	= isicom_flush_buffer,
+	.tiocmget	= isicom_tiocmget,
+	.tiocmset	= isicom_tiocmset,
+};
+
+static int __init register_drivers(void)
+{
+	int error;
+
+	/* tty driver structure initialization */
+	isicom_normal = alloc_tty_driver(PORT_COUNT);
+	if (!isicom_normal)
+		return -ENOMEM;
+
+	isicom_normal->owner	= THIS_MODULE;
+	isicom_normal->name 	= "ttyM";
+	isicom_normal->devfs_name = "isicom/";
+	isicom_normal->major	= ISICOM_NMAJOR;
+	isicom_normal->minor_start	= 0;
+	isicom_normal->type	= TTY_DRIVER_TYPE_SERIAL;
+	isicom_normal->subtype	= SERIAL_TYPE_NORMAL;
+	isicom_normal->init_termios	= tty_std_termios;
+	isicom_normal->init_termios.c_cflag	= 
+				B9600 | CS8 | CREAD | HUPCL |CLOCAL;
+	isicom_normal->flags	= TTY_DRIVER_REAL_RAW;
+	tty_set_operations(isicom_normal, &isicom_ops);
+	
+	if ((error=tty_register_driver(isicom_normal))!=0) {
+		printk(KERN_DEBUG "ISICOM: Couldn't register the dialin driver, error=%d\n",
+			error);
+		put_tty_driver(isicom_normal);
+		return error;
+	}
+	return 0;
+}
+
+static void __exit unregister_drivers(void)
+{
+	int error = tty_unregister_driver(isicom_normal);
+	if (error)
+		printk(KERN_DEBUG "ISICOM: couldn't unregister normal driver error=%d.\n",error);
+	put_tty_driver(isicom_normal);
+}
+
+static int __init register_isr(void)
+{
+	int count, done=0;
+	unsigned long irqflags;
+
+	for (count=0; count < BOARD_COUNT; count++ ) {
+		if (isi_card[count].base) {
+			irqflags = (isi_card[count].isa == YES) ? 
+					SA_INTERRUPT : 
+					(SA_INTERRUPT | SA_SHIRQ);
+
+			if (request_irq(isi_card[count].irq, 
+					isicom_interrupt, 
+					irqflags, 
+					ISICOM_NAME, &isi_card[count])) {
+
+				printk(KERN_WARNING "ISICOM: Could not"
+					" install handler at Irq %d."
+					" Card%d will be disabled.\n",
+					isi_card[count].irq, count+1);
+
+				release_region(isi_card[count].base,16);
+				isi_card[count].base=0;
+			}
+			else
+				done++;
+		}	
+	}
+	return done;
+}
+
+static void __exit unregister_isr(void)
+{
+	int count;
+
+	for (count=0; count < BOARD_COUNT; count++ ) {
+		if (isi_card[count].base)
+			free_irq(isi_card[count].irq, &isi_card[count]);
+	}
+}
+
+static int __init isicom_init(void)
+{
+	int card, channel, base;
+	struct isi_port * port;
+	unsigned long page;
+	
+	if (!tmp_buf) { 
+		page = get_zeroed_page(GFP_KERNEL);
+	      	if (!page) {
+#ifdef ISICOM_DEBUG	      	
+	      		printk(KERN_DEBUG "ISICOM: Couldn't allocate page for tmp_buf.\n");
+#else
+			printk(KERN_ERR "ISICOM: Not enough memory...\n");
+#endif	      
+	      		return 0;
+	      	}	
+	      	tmp_buf = (unsigned char *) page;
+	}
+	
+	if (!register_ioregion()) 
+	{
+		printk(KERN_ERR "ISICOM: All required I/O space found busy.\n");
+		free_page((unsigned long)tmp_buf);
+		return 0;
+	}
+	if (register_drivers()) 
+	{
+		unregister_ioregion();
+		free_page((unsigned long)tmp_buf);
+		return 0;
+	}
+	if (!register_isr()) 
+	{
+		unregister_drivers();
+		/*  ioports already uregistered in register_isr */
+		free_page((unsigned long)tmp_buf);
+		return 0;		
+	}
+	
+	memset(isi_ports, 0, sizeof(isi_ports));
+	for (card = 0; card < BOARD_COUNT; card++) {
+		port = &isi_ports[card * 16];
+		isi_card[card].ports = port;
+		spin_lock_init(&isi_card[card].card_lock);
+		base = isi_card[card].base;
+		for (channel = 0; channel < 16; channel++, port++) {
+			port->magic = ISICOM_MAGIC;
+			port->card = &isi_card[card];
+			port->channel = channel;
+		 	port->close_delay = 50 * HZ/100;
+		 	port->closing_wait = 3000 * HZ/100;
+		 	INIT_WORK(&port->hangup_tq, do_isicom_hangup, port);
+		 	INIT_WORK(&port->bh_tqueue, isicom_bottomhalf, port);
+		 	port->status = 0;
+			init_waitqueue_head(&port->open_wait);	 				
+			init_waitqueue_head(&port->close_wait);
+			/*  . . .  */
+ 		}
+	} 
+	
+	return 1;	
+}
+
+/*
+ *	Insmod can set static symbols so keep these static
+ */
+ 
+static int io[4];
+static int irq[4];
+
+MODULE_AUTHOR("MultiTech");
+MODULE_DESCRIPTION("Driver for the ISI series of cards by MultiTech");
+MODULE_LICENSE("GPL");
+module_param_array(io, int, NULL, 0);
+MODULE_PARM_DESC(io, "I/O ports for the cards");
+module_param_array(irq, int, NULL, 0);
+MODULE_PARM_DESC(irq, "Interrupts for the cards");
+
+static int __devinit isicom_setup(void)
+{
+	struct pci_dev *dev = NULL;
+	int retval, card, idx, count;
+	unsigned char pciirq;
+	unsigned int ioaddr;
+	                
+	card = 0;
+	for(idx=0; idx < BOARD_COUNT; idx++) {	
+		if (io[idx]) {
+			isi_card[idx].base=io[idx];
+			isi_card[idx].irq=irq[idx];
+			isi_card[idx].isa=YES;
+			card++;
+		}
+		else {
+			isi_card[idx].base = 0;
+			isi_card[idx].irq = 0;
+		}
+	}
+	
+	for (idx=0 ;idx < card; idx++) {
+		if (!((isi_card[idx].irq==2)||(isi_card[idx].irq==3)||
+		    (isi_card[idx].irq==4)||(isi_card[idx].irq==5)||
+		    (isi_card[idx].irq==7)||(isi_card[idx].irq==10)||
+		    (isi_card[idx].irq==11)||(isi_card[idx].irq==12)||
+		    (isi_card[idx].irq==15))) {
+			
+			if (isi_card[idx].base) {
+				printk(KERN_ERR "ISICOM: Irq %d unsupported. Disabling Card%d...\n",
+					isi_card[idx].irq, idx+1);
+				isi_card[idx].base=0;
+				card--;
+			}	
+		}
+	}	
+	
+	if (card < BOARD_COUNT) {
+		for (idx=0; idx < DEVID_COUNT; idx++) {
+			dev = NULL;
+			for (;;){
+				if (!(dev = pci_find_device(VENDOR_ID, isicom_pci_tbl[idx].device, dev)))
+					break;
+				if (card >= BOARD_COUNT)
+					break;
+					
+				if (pci_enable_device(dev))
+					break;
+
+				/* found a PCI ISI card! */
+				ioaddr = pci_resource_start (dev, 3); /* i.e at offset 0x1c in the
+								       * PCI configuration register
+								       * space.
+								       */
+				pciirq = dev->irq;
+				printk(KERN_INFO "ISI PCI Card(Device ID 0x%x)\n", isicom_pci_tbl[idx].device);
+				/*
+				 * allot the first empty slot in the array
+				 */				
+				for (count=0; count < BOARD_COUNT; count++) {				
+					if (isi_card[count].base == 0) {
+						isi_card[count].base = ioaddr;
+						isi_card[count].irq = pciirq;
+						isi_card[count].isa = NO;
+						card++;
+						break;
+					}
+				}
+			}				
+			if (card >= BOARD_COUNT) break;
+		}
+	}
+	
+	if (!(isi_card[0].base || isi_card[1].base || isi_card[2].base || isi_card[3].base)) {
+		printk(KERN_ERR "ISICOM: No valid card configuration. Driver cannot be initialized...\n"); 
+		return -EIO;
+	}	
+
+	retval = misc_register(&isiloader_device);
+	if (retval < 0) {
+		printk(KERN_ERR "ISICOM: Unable to register firmware loader driver.\n");
+		return retval;
+	}
+	
+	if (!isicom_init()) {
+		if (misc_deregister(&isiloader_device)) 
+			printk(KERN_ERR "ISICOM: Unable to unregister Firmware Loader driver\n");
+		return -EIO;
+	}
+	
+	init_timer(&tx);
+	tx.expires = jiffies + 1;
+	tx.data = 0;
+	tx.function = isicom_tx;
+	re_schedule = 1;
+	add_timer(&tx);
+	
+	return 0;
+}
+
+static void __exit isicom_exit(void)
+{
+	re_schedule = 0;
+	/* FIXME */
+	msleep(1000);
+	unregister_isr();
+	unregister_drivers();
+	unregister_ioregion();	
+	if(tmp_buf)
+		free_page((unsigned long)tmp_buf);
+	if (misc_deregister(&isiloader_device))
+		printk(KERN_ERR "ISICOM: Unable to unregister Firmware Loader driver\n");
+}
+
+module_init(isicom_setup);
+module_exit(isicom_exit);