Merge with Linux 2.1.72, part 2.

The new signal code with exception of the code for the rt signals.
The definitions in <asm/siginfo.h> and <asm/ucontext.h> are currently
just stolen from the Alpha and will need to be overhauled.

1 files changed, 2333 insertions, 0 deletions

diff --git a/drivers/char/specialix.c b/drivers/char/specialix.c
new file mode 100644
index 000000000..edd80e3d2
--- /dev/null
+++ b/drivers/char/specialix.c
@@ -0,0 +1,2333 @@
+/*
+ *      specialix.c  -- specialix IO8+ multiport serial driver.
+ *
+ *      Copyright (C) 1997  Roger Wolff (R.E.Wolff@BitWizard.nl)
+ *      Copyright (C) 1994-1996  Dmitry Gorodchanin (begemot@bgm.rosprint.net)
+ *
+ *      Specialix pays for the development and support of this driver.
+ *      Please DO contact io8-linux@specialix.co.uk if you require
+ *      support. But please read the documentation (specialix.txt)
+ *      first.
+ *
+ *      This driver was developped in the BitWizard linux device
+ *      driver service. If you require a linux device driver for your
+ *      product, please contact devices@BitWizard.nl for a quote.
+ *
+ *      This code is firmly based on the riscom/8 serial driver,
+ *      written by Dmitry Gorodchanin. The specialix IO8+ card
+ *      programming information was obtained from the CL-CD1865 Data
+ *      Book, and Specialix document number 6200059: IO8+ Hardware
+ *      Functional Specification.
+ *
+ *      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.
+ *
+ *      This program is distributed in the hope that it will be
+ *      useful, but WITHOUT ANY WARRANTY; without even the implied
+ *      warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ *      PURPOSE.  See the GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public
+ *      License along with this program; if not, write to the Free
+ *      Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
+ *      USA.
+ *
+ * Revision history:
+ *
+ * Revision 1.0:  April 1st 1997.
+ *                Initial release for alpha testing.
+ * Revision 1.1:  April 14th 1997. 
+ *                Incorporated Richard Hudsons suggestions, 
+ *                removed some debugging printk's.
+ * Revision 1.2:  April 15th 1997.
+ *                Ported to 2.1.x kernels.
+ * Revision 1.3:  April 17th 1997 
+ *                Backported to 2.0. (Compatibility macros). 
+ * Revision 1.4:  April 18th 1997
+ *                Fixed DTR/RTS bug that caused the card to indicate 
+ *                "don't send data" to a modem after the password prompt.  
+ *                Fixed bug for premature (fake) interrupts.
+ * Revision 1.5:  April 19th 1997
+ *                fixed a minor typo in the header file, cleanup a little. 
+ *                performance warnings are now MAXed at once per minute.
+ * Revision 1.6:  May 23 1997
+ *                Changed the specialix=... format to include interrupt.
+ * Revision 1.7:  May 27 1997
+ *                Made many more debug printk's a compile time option.
+ * Revision 1.8:  Jul 1  1997
+ *                port to linux-2.1.43 kernel.
+ * 
+ */
+
+#define VERSION "1.8"
+
+
+/*
+ * There is a bunch of documentation about the card, jumpers, config
+ * settings, restrictions, cables, device names and numbers in
+ * ../../Documentation/specialix.txt 
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/mm.h>
+#include <linux/serial.h>
+#include <linux/fcntl.h>
+#include <linux/major.h>
+#include <linux/delay.h>
+#include <linux/tqueue.h>
+#include <linux/version.h>
+
+
+/* ************************************************************** */
+/* * This section can be removed when 2.0 becomes outdated....  * */
+/* ************************************************************** */
+
+#if LINUX_VERSION_CODE < 131328    /* Less than 2.1.0 */
+#define TWO_ZERO
+#else
+#if LINUX_VERSION_CODE < 131371   /* less than 2.1.43 */
+/* This has not been extensively tested yet. Sorry. */
+#warning "You're on your own between 2.1.0 and 2.1.43.... "
+#warning "Please use a recent kernel."
+#endif
+#endif
+
+
+#ifdef TWO_ZERO
+#define Get_user(a,b)         a = get_user(b)
+#define copy_from_user(a,b,c) memcpy_fromfs(a,b,c)
+#define copy_to_user(a,b,c)   memcpy_tofs(a,b,c)
+#define queue_task            queue_task_irq_off
+#else
+#define Get_user(a,b)         get_user(a,b)
+#endif
+
+/* ************************************************************** */
+/* *                End of compatibility section..              * */
+/* ************************************************************** */
+
+
+#ifndef TWO_ZERO
+#include <asm/uaccess.h>
+#endif
+
+#include "specialix_io8.h"
+#include "cd1865.h"
+
+
+
+/* Configurable options: */
+
+/* Am I paranoid or not ? ;-) */
+#define SPECIALIX_PARANOIA_CHECK
+
+/* Do I trust the IRQ from the card? (enabeling it doesn't seem to help)
+   When the IRQ routine leaves the chip in a state that is keeps on
+   requiring attention, the timer doesn't help either. */
+#undef SPECIALIX_TIMER
+
+/* 
+ * The following defines are mostly for testing purposes. But if you need
+ * some nice reporting in your syslog, you can define them also.
+ */
+#undef SX_REPORT_FIFO
+#undef SX_REPORT_OVERRUN
+
+
+
+#ifdef CONFIG_SPECIALIX_RTSCTS
+#define SX_CRTSCTS(bla) 1
+#else
+#define SX_CRTSCTS(tty) C_CRTSCTS(tty)
+#endif
+
+
+/* Used to be outb (0xff, 0x80); */
+#define short_pause() udelay (1)
+
+
+#define SPECIALIX_LEGAL_FLAGS \
+	(ASYNC_HUP_NOTIFY   | ASYNC_SAK          | ASYNC_SPLIT_TERMIOS   | \
+	 ASYNC_SPD_HI       | ASYNC_SPEED_VHI    | ASYNC_SESSION_LOCKOUT | \
+	 ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
+
+#ifndef MIN
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#endif
+
+DECLARE_TASK_QUEUE(tq_specialix);
+
+
+
+#define SPECIALIX_TYPE_NORMAL	1
+#define SPECIALIX_TYPE_CALLOUT	2
+
+static struct specialix_board * IRQ_to_board[16] = { NULL, } ;
+static struct tty_driver specialix_driver, specialix_callout_driver;
+static int    specialix_refcount = 0;
+static struct tty_struct * specialix_table[SX_NBOARD * SX_NPORT] = { NULL, };
+static struct termios * specialix_termios[SX_NBOARD * SX_NPORT] = { NULL, };
+static struct termios * specialix_termios_locked[SX_NBOARD * SX_NPORT] = { NULL, };
+static unsigned char * tmp_buf = NULL;
+static struct semaphore tmp_buf_sem = MUTEX;
+
+static unsigned long baud_table[] =  {
+	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+	9600, 19200, 38400, 57600, 115200, 0, 
+};
+
+static struct specialix_board sx_board[SX_NBOARD] =  {
+	{ 0, SX_IOBASE1,  9, },
+	{ 0, SX_IOBASE2, 11, },
+	{ 0, SX_IOBASE3, 12, },
+	{ 0, SX_IOBASE4, 15, },
+};
+
+static struct specialix_port sx_port[SX_NBOARD * SX_NPORT] =  {
+	{ 0, },
+};
+		
+
+#ifdef SPECIALIX_TIMER
+static struct timer_list missed_irq_timer;
+static void sx_interrupt(int irq, void * dev_id, struct pt_regs * regs);
+#endif
+
+
+
+static inline int sx_paranoia_check(struct specialix_port const * port,
+				    kdev_t device, const char *routine)
+{
+#ifdef SPECIALIX_PARANOIA_CHECK
+	static const char *badmagic =
+		KERN_ERR "sx: Warning: bad specialix port magic number for device %s in %s\n";
+	static const char *badinfo =
+		KERN_ERR "sx: Warning: null specialix port for device %s in %s\n";
+ 
+	if (!port) {
+		printk(badinfo, kdevname(device), routine);
+		return 1;
+	}
+	if (port->magic != SPECIALIX_MAGIC) {
+		printk(badmagic, kdevname(device), routine);
+		return 1;
+	}
+#endif
+	return 0;
+}
+
+
+/*
+ * 
+ *  Service functions for specialix IO8+ driver.
+ * 
+ */
+
+/* Get board number from pointer */
+extern inline int board_No (struct specialix_board * bp)
+{
+	return bp - sx_board;
+}
+
+
+/* Get port number from pointer */
+extern inline int port_No (struct specialix_port const * port)
+{
+	return SX_PORT(port - sx_port); 
+}
+
+
+/* Get pointer to board from pointer to port */
+extern inline struct specialix_board * port_Board(struct specialix_port const * port)
+{
+	return &sx_board[SX_BOARD(port - sx_port)];
+}
+
+
+/* Input Byte from CL CD186x register */
+extern inline unsigned char sx_in(struct specialix_board  * bp, unsigned short reg)
+{
+	bp->reg = reg | 0x80;
+	outb (reg | 0x80, bp->base + SX_ADDR_REG);
+	return inb  (bp->base + SX_DATA_REG);
+}
+
+
+/* Output Byte to CL CD186x register */
+extern inline void sx_out(struct specialix_board  * bp, unsigned short reg,
+			  unsigned char val)
+{
+	bp->reg = reg | 0x80;
+	outb (reg | 0x80, bp->base + SX_ADDR_REG);
+	outb (val, bp->base + SX_DATA_REG);
+}
+
+
+/* Input Byte from CL CD186x register */
+extern inline unsigned char sx_in_off(struct specialix_board  * bp, unsigned short reg)
+{
+	bp->reg = reg;
+	outb (reg, bp->base + SX_ADDR_REG);
+	return inb  (bp->base + SX_DATA_REG);
+}
+
+
+/* Output Byte to CL CD186x register */
+extern inline void sx_out_off(struct specialix_board  * bp, unsigned short reg,
+			  unsigned char val)
+{
+	bp->reg = reg;
+	outb (reg, bp->base + SX_ADDR_REG);
+	outb (val, bp->base + SX_DATA_REG);
+}
+
+
+/* Wait for Channel Command Register ready */
+extern inline void sx_wait_CCR(struct specialix_board  * bp)
+{
+	unsigned long delay;
+
+	for (delay = SX_CCR_TIMEOUT; delay; delay--) 
+		if (!sx_in(bp, CD186x_CCR))
+			return;
+	
+	printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp));
+}
+
+
+/* Wait for Channel Command Register ready */
+extern inline void sx_wait_CCR_off(struct specialix_board  * bp)
+{
+	unsigned long delay;
+
+	for (delay = SX_CCR_TIMEOUT; delay; delay--) 
+		if (!sx_in_off(bp, CD186x_CCR))
+			return;
+	
+	printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp));
+}
+
+
+/*
+ *  specialix IO8+ IO range functions.
+ */
+
+extern inline int sx_check_io_range(struct specialix_board * bp)
+{
+	return check_region (bp->base, SX_IO_SPACE);
+}
+
+
+extern inline void sx_request_io_range(struct specialix_board * bp)
+{
+	request_region(bp->base, SX_IO_SPACE, "specialix IO8+" );
+}
+
+
+extern inline void sx_release_io_range(struct specialix_board * bp)
+{
+	release_region(bp->base, SX_IO_SPACE);
+}
+
+	
+/* Must be called with enabled interrupts */
+extern inline void sx_long_delay(unsigned long delay)
+{
+	unsigned long i;
+	
+	for (i = jiffies + delay; i > jiffies; ) ;
+}
+
+
+
+/* Set the IRQ using the RTS lines that run to the PAL on the board.... */
+int sx_set_irq ( struct specialix_board *bp)
+{
+	int virq;
+	int i;
+
+	switch (bp->irq) {
+	/* In the same order as in the docs... */
+	case 15: virq = 0;break;
+	case 12: virq = 1;break;
+	case 11: virq = 2;break;
+	case 9:  virq = 3;break;
+	default: printk (KERN_ERR "Speclialix: cannot set irq to %d.\n", bp->irq);
+	         return 0;
+	}
+
+	for (i=0;i<2;i++) {
+		sx_out(bp, CD186x_CAR, i);
+		sx_out(bp, CD186x_MSVRTS, ((virq >> i) & 0x1)? MSVR_RTS:0);
+	}
+	return 1;
+}
+
+
+/* Reset and setup CD186x chip */
+static int sx_init_CD186x(struct specialix_board  * bp)
+{
+	unsigned long flags;
+	int scaler;
+	int rv = 1;
+	
+	save_flags(flags); cli();
+
+	sx_wait_CCR_off(bp);			   /* Wait for CCR ready        */
+	sx_out_off(bp, CD186x_CCR, CCR_HARDRESET);      /* Reset CD186x chip          */
+	sti();
+	sx_long_delay(HZ/20);                      /* Delay 0.05 sec            */
+	cli();
+	sx_out_off(bp, CD186x_GIVR, SX_ID);             /* Set ID for this chip      */
+	sx_out_off(bp, CD186x_GICR, 0);                 /* Clear all bits            */
+	sx_out_off(bp, CD186x_PILR1, SX_ACK_MINT);      /* Prio for modem intr       */
+	sx_out_off(bp, CD186x_PILR2, SX_ACK_TINT);      /* Prio for transmitter intr */
+	sx_out_off(bp, CD186x_PILR3, SX_ACK_RINT);      /* Prio for receiver intr    */
+	/* Set RegAckEn */
+	sx_out_off(bp, CD186x_SRCR, sx_in (bp, CD186x_SRCR) | SRCR_REGACKEN);
+	
+	/* Setting up prescaler. We need 4 ticks per 1 ms */
+	scaler =  SX_OSCFREQ/SPECIALIX_TPS;
+
+	sx_out_off(bp, CD186x_PPRH, scaler >> 8);
+	sx_out_off(bp, CD186x_PPRL, scaler & 0xff);
+
+	if (!sx_set_irq (bp)) {
+		/* Figure out how to pass this along... */
+		printk (KERN_ERR "Cannot set irq to %d.\n", bp->irq);
+		rv = 0;
+	}
+
+	restore_flags(flags);
+	return rv;
+}
+
+
+int read_cross_byte (struct specialix_board *bp, int reg, int bit)
+{
+	int i;
+	int t;
+
+	for (i=0, t=0;i<8;i++) {
+		sx_out_off (bp, CD186x_CAR, i);
+		if (sx_in_off (bp, reg) & bit) 
+			t |= 1 << i;
+	}
+	return t;
+}
+
+
+#ifdef SPECIALIX_TIMER
+void missed_irq (unsigned long data)
+{
+	if (sx_in ((struct specialix_board *)data, CD186x_SRSR) &  
+	                                            (SRSR_RREQint |
+	                                             SRSR_TREQint |
+	                                             SRSR_MREQint)) {
+		printk (KERN_INFO "Missed interrupt... Calling int from timer. \n");
+		sx_interrupt (((struct specialix_board *)data)->irq, 
+		              NULL, NULL);
+	}
+	missed_irq_timer.expires = jiffies + HZ;
+	add_timer (&missed_irq_timer);
+}
+#endif
+
+
+
+/* Main probing routine, also sets irq. */
+static int sx_probe(struct specialix_board *bp)
+{
+	unsigned char val1, val2;
+#if 0
+	int irqs = 0;
+	int retries;
+#endif
+	int rev;
+	int chip;
+
+	if (sx_check_io_range(bp)) 
+		return 1;
+
+	/* Are the I/O ports here ? */
+	sx_out_off(bp, CD186x_PPRL, 0x5a);
+	short_pause ();
+	val1 = sx_in_off(bp, CD186x_PPRL);
+
+	sx_out_off(bp, CD186x_PPRL, 0xa5);
+	short_pause ();
+	val2 = sx_in_off(bp, CD186x_PPRL);
+
+	
+	if ((val1 != 0x5a) || (val2 != 0xa5)) {
+		printk(KERN_INFO "sx%d: specialix IO8+ Board at 0x%03x not found.\n",
+		       board_No(bp), bp->base);
+		return 1;
+	}
+
+	/* Check the DSR lines that Specialix uses as board 
+	   identification */
+	val1 = read_cross_byte (bp, CD186x_MSVR, MSVR_DSR);
+	val2 = read_cross_byte (bp, CD186x_MSVR, MSVR_RTS);
+#ifdef SPECIALIX_DEBUG
+	printk (KERN_DEBUG "sx%d: DSR lines are: %02x, rts lines are: %02x\n", 
+	        board_No(bp),  val1, val2);
+#endif
+	if (val1 != 0xb2) {
+		printk(KERN_INFO "sx%d: specialix IO8+ ID at 0x%03x not found.\n",
+		       board_No(bp), bp->base);
+		return 1;
+	}
+
+
+#if 0
+	/* It's time to find IRQ for this board */
+	for (retries = 0; retries < 5 && irqs <= 0; retries++) {
+		irqs = probe_irq_on();
+		sx_init_CD186x(bp);	       		/* Reset CD186x chip       */
+		sx_out(bp, CD186x_CAR, 2);               /* Select port 2          */
+		sx_wait_CCR(bp);
+		sx_out(bp, CD186x_CCR, CCR_TXEN);        /* Enable transmitter     */
+		sx_out(bp, CD186x_IER, IER_TXRDY);       /* Enable tx empty intr   */
+		sx_long_delay(HZ/20);	       		
+		irqs = probe_irq_off(irqs);
+
+#if SPECIALIX_DEBUG > 2
+		printk (KERN_DEBUG "SRSR = %02x, ",  sx_in(bp, CD186x_SRSR));
+		printk (           "TRAR = %02x, ",  sx_in(bp, CD186x_TRAR));
+		printk (           "GIVR = %02x, ",  sx_in(bp, CD186x_GIVR));
+		printk (           "GICR = %02x, ",  sx_in(bp, CD186x_GICR));
+		printk (           "\n");
+#endif
+		/* Reset CD186x again      */
+		if (!sx_init_CD186x(bp)) {
+			/* Hmmm. This is dead code anyway. */
+		}
+#if SPECIALIX_DEBUG > 2
+		printk (KERN_DEBUG "val1 = %02x, val2 = %02x, val3 = %02x.\n", 
+		        val1, val2, val3); 
+#endif
+	
+	}
+	
+#if 0
+	if (irqs <= 0) {
+		printk(KERN_ERR "sx%d: Can't find IRQ for specialix IO8+ board at 0x%03x.\n",
+		       board_No(bp), bp->base);
+		return 1;
+	}
+#endif
+	printk (KERN_INFO "Started with irq=%d, but now have irq=%d.\n", bp->irq, irqs);
+	if (irqs > 0)
+		bp->irq = irqs;
+#endif
+	/* Reset CD186x again  */
+	if (!sx_init_CD186x(bp)) {
+		return -EIO;
+	}
+
+	sx_request_io_range(bp);
+	bp->flags |= SX_BOARD_PRESENT;
+	
+	/* Chip           revcode   pkgtype
+	                  GFRCR     SRCR bit 7
+	   CD180 rev B    0x81      0
+	   CD180 rev C    0x82      0
+	   CD1864 rev A   0x82      1
+	   CD1865 rev A   0x83      1  -- Do not use!!! Does not work. 
+	   CD1865 rev B   0x84      1
+	 -- Thanks to Gwen Wang, Cirrus Logic.
+	 */
+
+	switch (sx_in_off(bp, CD186x_GFRCR)) {
+	case 0x82:chip = 1864;rev='A';break;
+	case 0x83:chip = 1865;rev='A';break;
+	case 0x84:chip = 1865;rev='B';break;
+	case 0x85:chip = 1865;rev='C';break; /* Does not exist at this time */
+	default:chip=-1;rev='x';
+	}
+
+#if SPECIALIX_DEBUG > 2
+	printk (KERN_DEBUG " GFCR = 0x%02x\n", sx_in_off(bp, CD186x_GFRCR) );
+#endif
+
+#ifdef SPECIALIX_TIMER
+	init_timer (&missed_irq_timer);
+	missed_irq_timer.function = missed_irq;
+	missed_irq_timer.data = (unsigned long) bp;
+	missed_irq_timer.expires = jiffies + HZ;
+	add_timer (&missed_irq_timer);
+#endif
+
+	printk(KERN_INFO"sx%d: specialix IO8+ board detected at 0x%03x, IRQ %d, CD%d Rev. %c.\n",
+	       board_No(bp),
+	       bp->base, bp->irq,
+	       chip, rev);
+
+	return 0;
+}
+
+/* 
+ * 
+ *  Interrupt processing routines.
+ * */
+
+extern inline void sx_mark_event(struct specialix_port * port, int event)
+{
+	/* 
+	 * I'm not quite happy with current scheme all serial
+	 * drivers use their own BH routine.
+	 * It seems this easily can be done with one BH routine
+	 * serving for all serial drivers.
+	 * For now I must introduce another one - SPECIALIX_BH.
+	 * Still hope this will be changed in near future.
+	 * -- Dmitry.
+	 */
+	set_bit(event, &port->event);
+	queue_task(&port->tqueue, &tq_specialix);
+	mark_bh(SPECIALIX_BH);
+}
+
+
+extern inline struct specialix_port * sx_get_port(struct specialix_board * bp,
+					       unsigned char const * what)
+{
+	unsigned char channel;
+	struct specialix_port * port;
+	
+	channel = sx_in(bp, CD186x_GICR) >> GICR_CHAN_OFF;
+	if (channel < CD186x_NCH) {
+		port = &sx_port[board_No(bp) * SX_NPORT + channel];
+		if (port->flags & ASYNC_INITIALIZED) {
+			return port;
+		}
+	}
+	printk(KERN_INFO "sx%d: %s interrupt from invalid port %d\n", 
+	       board_No(bp), what, channel);
+	return NULL;
+}
+
+
+extern inline void sx_receive_exc(struct specialix_board * bp)
+{
+	struct specialix_port *port;
+	struct tty_struct *tty;
+	unsigned char status;
+	unsigned char ch;
+
+	if (!(port = sx_get_port(bp, "Receive")))
+		return;
+
+	tty = port->tty;
+	if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
+		printk(KERN_INFO "sx%d: port %d: Working around flip buffer overflow.\n",
+		       board_No(bp), port_No(port));
+		return;
+	}
+	
+#ifdef SX_REPORT_OVERRUN	
+	status = sx_in(bp, CD186x_RCSR);
+	if (status & RCSR_OE) {
+		port->overrun++;
+#if SPECIALIX_DEBUG 
+		printk(KERN_DEBUG "sx%d: port %d: Overrun. Total %ld overruns.\n", 
+		       board_No(bp), port_No(port), port->overrun);
+#endif		
+	}
+	status &= port->mark_mask;
+#else	
+	status = sx_in(bp, CD186x_RCSR) & port->mark_mask;
+#endif	
+	ch = sx_in(bp, CD186x_RDR);
+	if (!status) {
+		return;
+	}
+	if (status & RCSR_TOUT) {
+		printk(KERN_INFO "sx%d: port %d: Receiver timeout. Hardware problems ?\n", 
+		       board_No(bp), port_No(port));
+		return;
+		
+	} else if (status & RCSR_BREAK) {
+#ifdef SPECIALIX_DEBUG
+		printk(KERN_DEBUG "sx%d: port %d: Handling break...\n",
+		       board_No(bp), port_No(port));
+#endif
+		*tty->flip.flag_buf_ptr++ = TTY_BREAK;
+		if (port->flags & ASYNC_SAK)
+			do_SAK(tty);
+		
+	} else if (status & RCSR_PE) 
+		*tty->flip.flag_buf_ptr++ = TTY_PARITY;
+	
+	else if (status & RCSR_FE) 
+		*tty->flip.flag_buf_ptr++ = TTY_FRAME;
+	
+	else if (status & RCSR_OE)
+		*tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
+	
+	else
+		*tty->flip.flag_buf_ptr++ = 0;
+	
+	*tty->flip.char_buf_ptr++ = ch;
+	tty->flip.count++;
+	queue_task(&tty->flip.tqueue, &tq_timer);
+}
+
+
+extern inline void sx_receive(struct specialix_board * bp)
+{
+	struct specialix_port *port;
+	struct tty_struct *tty;
+	unsigned char count;
+	
+	if (!(port = sx_get_port(bp, "Receive")))
+		return;
+	
+	tty = port->tty;
+	
+	count = sx_in(bp, CD186x_RDCR);
+	
+#ifdef SX_REPORT_FIFO
+	port->hits[count > 8 ? 9 : count]++;
+#endif	
+	
+	while (count--) {
+		if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
+			printk(KERN_INFO "sx%d: port %d: Working around flip buffer overflow.\n",
+			       board_No(bp), port_No(port));
+			break;
+		}
+		*tty->flip.char_buf_ptr++ = sx_in(bp, CD186x_RDR);
+		*tty->flip.flag_buf_ptr++ = 0;
+		tty->flip.count++;
+	}
+	queue_task(&tty->flip.tqueue, &tq_timer);
+}
+
+
+extern inline void sx_transmit(struct specialix_board * bp)
+{
+	struct specialix_port *port;
+	struct tty_struct *tty;
+	unsigned char count;
+	
+	
+	if (!(port = sx_get_port(bp, "Transmit")))
+		return;
+	
+	tty = port->tty;
+	
+	if (port->IER & IER_TXEMPTY) {
+		/* FIFO drained */
+		sx_out(bp, CD186x_CAR, port_No(port));
+		port->IER &= ~IER_TXEMPTY;
+		sx_out(bp, CD186x_IER, port->IER);
+		return;
+	}
+	
+	if ((port->xmit_cnt <= 0 && !port->break_length)
+	    || tty->stopped || tty->hw_stopped) {
+		sx_out(bp, CD186x_CAR, port_No(port));
+		port->IER &= ~IER_TXRDY;
+		sx_out(bp, CD186x_IER, port->IER);
+		return;
+	}
+	
+	if (port->break_length) {
+		if (port->break_length > 0) {
+			if (port->COR2 & COR2_ETC) {
+				sx_out(bp, CD186x_TDR, CD186x_C_ESC);
+				sx_out(bp, CD186x_TDR, CD186x_C_SBRK);
+				port->COR2 &= ~COR2_ETC;
+			}
+			count = MIN(port->break_length, 0xff);
+			sx_out(bp, CD186x_TDR, CD186x_C_ESC);
+			sx_out(bp, CD186x_TDR, CD186x_C_DELAY);
+			sx_out(bp, CD186x_TDR, count);
+			if (!(port->break_length -= count))
+				port->break_length--;
+		} else {
+			sx_out(bp, CD186x_TDR, CD186x_C_ESC);
+			sx_out(bp, CD186x_TDR, CD186x_C_EBRK);
+			sx_out(bp, CD186x_COR2, port->COR2);
+			sx_wait_CCR(bp);
+			sx_out(bp, CD186x_CCR, CCR_CORCHG2);
+			port->break_length = 0;
+		}
+		return;
+	}
+	
+	count = CD186x_NFIFO;
+	do {
+		sx_out(bp, CD186x_TDR, port->xmit_buf[port->xmit_tail++]);
+		port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
+		if (--port->xmit_cnt <= 0)
+			break;
+	} while (--count > 0);
+	
+	if (port->xmit_cnt <= 0) {
+		sx_out(bp, CD186x_CAR, port_No(port));
+		port->IER &= ~IER_TXRDY;
+		sx_out(bp, CD186x_IER, port->IER);
+	}
+	if (port->xmit_cnt <= port->wakeup_chars)
+		sx_mark_event(port, RS_EVENT_WRITE_WAKEUP);
+}
+
+
+extern inline void sx_check_modem(struct specialix_board * bp)
+{
+	struct specialix_port *port;
+	struct tty_struct *tty;
+	unsigned char mcr;
+
+#ifdef SPECIALIX_DEBUG
+	printk (KERN_DEBUG "Modem intr. ");
+#endif
+	if (!(port = sx_get_port(bp, "Modem")))
+		return;
+	
+	tty = port->tty;
+	
+	mcr = sx_in(bp, CD186x_MCR);
+	printk ("mcr = %02x.\n", mcr);
+
+	if ((mcr & MCR_CDCHG)) {
+#ifdef SPECIALIX_DEBUG 
+		printk (KERN_DEBUG "CD just changed... ");
+#endif
+		if (sx_in(bp, CD186x_MSVR) & MSVR_CD) {
+#ifdef SPECIALIX_DEBUG
+			printk ( "Waking up guys in open.\n");
+#endif
+			wake_up_interruptible(&port->open_wait);
+		}
+		else if (!((port->flags & ASYNC_CALLOUT_ACTIVE) &&
+		           (port->flags & ASYNC_CALLOUT_NOHUP))) {
+#ifdef SPECIALIX_DEBUG
+			printk ( "Sending HUP.\n");
+#endif
+			queue_task(&port->tqueue_hangup,  
+			           &tq_scheduler);      
+		} else {
+#ifdef SPECIALIX_DEBUG
+			printk ( "Don't need to send HUP.\n");
+#endif
+		}
+	}
+	
+#ifdef SPECIALIX_BRAIN_DAMAGED_CTS
+	if (mcr & MCR_CTSCHG) {
+		if (sx_in(bp, CD186x_MSVR) & MSVR_CTS) {
+			tty->hw_stopped = 0;
+			port->IER |= IER_TXRDY;
+			if (port->xmit_cnt <= port->wakeup_chars)
+				sx_mark_event(port, RS_EVENT_WRITE_WAKEUP);
+		} else {
+			tty->hw_stopped = 1;
+			port->IER &= ~IER_TXRDY;
+		}
+		sx_out(bp, CD186x_IER, port->IER);
+	}
+	if (mcr & MCR_DSSXHG) {
+		if (sx_in(bp, CD186x_MSVR) & MSVR_DSR) {
+			tty->hw_stopped = 0;
+			port->IER |= IER_TXRDY;
+			if (port->xmit_cnt <= port->wakeup_chars)
+				sx_mark_event(port, RS_EVENT_WRITE_WAKEUP);
+		} else {
+			tty->hw_stopped = 1;
+			port->IER &= ~IER_TXRDY;
+		}
+		sx_out(bp, CD186x_IER, port->IER);
+	}
+#endif /* SPECIALIX_BRAIN_DAMAGED_CTS */
+	
+	/* Clear change bits */
+	sx_out(bp, CD186x_MCR, 0);
+}
+
+
+/* The main interrupt processing routine */
+static void sx_interrupt(int irq, void * dev_id, struct pt_regs * regs)
+{
+	unsigned char status;
+	unsigned char ack;
+	struct specialix_board *bp;
+	unsigned long loop = 0;
+	int saved_reg;
+
+	bp = IRQ_to_board[irq];
+	
+	if (!bp || !(bp->flags & SX_BOARD_ACTIVE)) {
+#ifdef SPECIALIX_DEBUG 
+		printk (KERN_DEBUG "sx: False interrupt. irq %d.\n", irq);
+#endif
+		return;
+	}
+
+	saved_reg = bp->reg;
+
+	while ((++loop < 16) && (status = (sx_in(bp, CD186x_SRSR) &
+	                                   (SRSR_RREQint |
+		                            SRSR_TREQint |
+	                                    SRSR_MREQint)))) {	
+		if (status & SRSR_RREQint) {
+			ack = sx_in(bp, CD186x_RRAR);
+
+			if (ack == (SX_ID | GIVR_IT_RCV))
+				sx_receive(bp);
+			else if (ack == (SX_ID | GIVR_IT_REXC))
+				sx_receive_exc(bp);
+			else
+				printk(KERN_ERR "sx%d: Bad receive ack 0x%02x.\n",
+				       board_No(bp), ack);
+		
+		} else if (status & SRSR_TREQint) {
+			ack = sx_in(bp, CD186x_TRAR);
+
+			if (ack == (SX_ID | GIVR_IT_TX))
+				sx_transmit(bp);
+			else
+				printk(KERN_ERR "sx%d: Bad transmit ack 0x%02x.\n",
+				       board_No(bp), ack);
+		} else if (status & SRSR_MREQint) {
+			ack = sx_in(bp, CD186x_MRAR);
+
+			if (ack == (SX_ID | GIVR_IT_MODEM)) 
+				sx_check_modem(bp);
+			else
+				printk(KERN_ERR "sx%d: Bad modem ack 0x%02x.\n",
+				       board_No(bp), ack);
+		
+		} 
+
+		sx_out(bp, CD186x_EOIR, 0);   /* Mark end of interrupt */
+	}
+	bp->reg = saved_reg;
+	outb (bp->reg, bp->base + SX_ADDR_REG);
+}
+
+
+/*
+ *  Routines for open & close processing.
+ */
+
+
+/* Called with disabled interrupts */
+extern inline int sx_setup_board(struct specialix_board * bp)
+{
+	int error;
+
+	if (bp->flags & SX_BOARD_ACTIVE) 
+		return 0;
+
+	error = request_irq(bp->irq, sx_interrupt, SA_INTERRUPT, "specialix IO8+", NULL);
+
+	if (error) 
+		return error;
+
+	IRQ_to_board[bp->irq] = bp;
+	(void) sx_in (bp, 0); /* Turn ON interrupts. */
+
+	bp->flags |= SX_BOARD_ACTIVE;
+
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+
+/* Called with disabled interrupts */
+extern inline void sx_shutdown_board(struct specialix_board *bp)
+{
+	if (!(bp->flags & SX_BOARD_ACTIVE))
+		return;
+	
+	bp->flags &= ~SX_BOARD_ACTIVE;
+	
+	free_irq(bp->irq, NULL);
+	(void) sx_in_off (bp, 0); /* Turn off interrupts. */
+
+	IRQ_to_board[bp->irq] = NULL;
+	
+	MOD_DEC_USE_COUNT;
+}
+
+
+/*
+ * Setting up port characteristics. 
+ * Must be called with disabled interrupts
+ */
+static void sx_change_speed(struct specialix_board *bp, struct specialix_port *port)
+{
+	struct tty_struct *tty;
+	unsigned long baud;
+	long tmp;
+	unsigned char cor1 = 0, cor3 = 0;
+	unsigned char mcor1 = 0, mcor2 = 0;
+	static int again=0;
+	
+	if (!(tty = port->tty) || !tty->termios)
+		return;
+
+	port->IER  = 0;
+	port->COR2 = 0;
+	/* Select port on the board */
+	sx_out(bp, CD186x_CAR, port_No(port));
+
+	/* The Specialix board doens't implement the RTS lines.
+	   They are used to set the IRQ level. Don't touch them. */
+	if (SX_CRTSCTS(tty))
+		port->MSVR = MSVR_DTR | (sx_in(bp, CD186x_MSVR) & MSVR_RTS);
+	else
+		port->MSVR =  (sx_in(bp, CD186x_MSVR) & MSVR_RTS);
+#ifdef DEBUG_SPECIALIX
+	printk (KERN_DEBUG "sx: got MSVR=%02x.\n", port->MSVR);
+#endif
+	baud = C_BAUD(tty);
+	
+	if (baud & CBAUDEX) {
+		baud &= ~CBAUDEX;
+		if (baud < 1 || baud > 2) 
+			port->tty->termios->c_cflag &= ~CBAUDEX;
+		else
+			baud += 15;
+	}
+	if (baud == 15) {
+		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+			baud ++;
+		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+			baud += 2;
+	}
+	
+	
+	if (!baud_table[baud]) {
+		/* Drop DTR & exit */
+#ifdef SPECIALIX_DEBUG
+		printk (KERN_DEBUG "Dropping DTR...  Hmm....\n");
+#endif
+		if (!SX_CRTSCTS (tty)) {
+			port -> MSVR &= ~ MSVR_DTR;
+			sx_out(bp, CD186x_MSVR, port->MSVR );
+		} 
+#ifdef DEBUG_SPECIALIX
+		else
+			printk (KERN_DEBUG "Can't drop DTR: no DTR.\n");
+#endif
+		return;
+	} else {
+		/* Set DTR on */
+		if (!SX_CRTSCTS (tty)) {
+			port ->MSVR |= MSVR_DTR;
+		}
+	}
+	
+	/*
+	 * Now we must calculate some speed depended things 
+	 */
+	
+	/* Set baud rate for port */
+	tmp = (((SX_OSCFREQ + baud_table[baud]/2) / baud_table[baud] +
+		CD186x_TPC/2) / CD186x_TPC);
+	if ((tmp < 0x10) && (again < jiffies)) { 
+		again = jiffies + HZ * 60;
+		/* Page 48 of version 2.0 of the CL-CD1865 databook */
+		if (tmp >= 12) {
+			printk (KERN_INFO "sx%d: Baud rate divisor is %ld. \n"
+			        "Performance degradation is possible.\n",
+			        port_No (port), tmp);
+		} else {
+			printk (KERN_INFO "sx%d: Baud rate divisor is %ld. \n"
+			        "Warning: overstressing Cirrus chip. "
+                                "This might not work.\n", 
+			        port_No (port), tmp);
+		}
+	}
+
+	sx_out(bp, CD186x_RBPRH, (tmp >> 8) & 0xff); 
+	sx_out(bp, CD186x_TBPRH, (tmp >> 8) & 0xff); 
+	sx_out(bp, CD186x_RBPRL, tmp & 0xff); 
+	sx_out(bp, CD186x_TBPRL, tmp & 0xff);
+	
+	baud = (baud_table[baud] + 5) / 10;   /* Estimated CPS */
+	
+	/* Two timer ticks seems enough to wakeup something like SLIP driver */
+	tmp = ((baud + HZ/2) / HZ) * 2 - CD186x_NFIFO;		
+	port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
+					      SERIAL_XMIT_SIZE - 1 : tmp);
+	
+	/* Receiver timeout will be transmission time for 1.5 chars */
+	tmp = (SPECIALIX_TPS + SPECIALIX_TPS/2 + baud/2) / baud;
+	tmp = (tmp > 0xff) ? 0xff : tmp;
+	sx_out(bp, CD186x_RTPR, tmp);
+	
+	switch (C_CSIZE(tty)) {
+	 case CS5:
+		cor1 |= COR1_5BITS;
+		break;
+	 case CS6:
+		cor1 |= COR1_6BITS;
+		break;
+	 case CS7:
+		cor1 |= COR1_7BITS;
+		break;
+	 case CS8:
+		cor1 |= COR1_8BITS;
+		break;
+	}
+	
+	if (C_CSTOPB(tty)) 
+		cor1 |= COR1_2SB;
+	
+	cor1 |= COR1_IGNORE;
+	if (C_PARENB(tty)) {
+		cor1 |= COR1_NORMPAR;
+		if (C_PARODD(tty)) 
+			cor1 |= COR1_ODDP;
+		if (I_INPCK(tty)) 
+			cor1 &= ~COR1_IGNORE;
+	}
+	/* Set marking of some errors */
+	port->mark_mask = RCSR_OE | RCSR_TOUT;
+	if (I_INPCK(tty)) 
+		port->mark_mask |= RCSR_FE | RCSR_PE;
+	if (I_BRKINT(tty) || I_PARMRK(tty)) 
+		port->mark_mask |= RCSR_BREAK;
+	if (I_IGNPAR(tty)) 
+		port->mark_mask &= ~(RCSR_FE | RCSR_PE);
+	if (I_IGNBRK(tty)) {
+		port->mark_mask &= ~RCSR_BREAK;
+		if (I_IGNPAR(tty)) 
+			/* Real raw mode. Ignore all */
+			port->mark_mask &= ~RCSR_OE;
+	}
+	/* Enable Hardware Flow Control */
+	if (C_CRTSCTS(tty)) {
+#ifdef SPECIALIX_BRAIN_DAMAGED_CTS
+		port->IER |= IER_DSR | IER_CTS;
+		mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
+		mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
+		tty->hw_stopped = !(sx_in(bp, CD186x_MSVR) & (MSVR_CTS|MSVR_DSR));
+#else
+		port->COR2 |= COR2_CTSAE; 
+#endif
+	}
+	/* Enable Software Flow Control. FIXME: I'm not sure about this */
+	/* Some people reported that it works, but I still doubt it */
+	if (I_IXON(tty)) {
+		port->COR2 |= COR2_TXIBE;
+		cor3 |= (COR3_FCT | COR3_SCDE);
+		if (I_IXANY(tty))
+			port->COR2 |= COR2_IXM;
+		sx_out(bp, CD186x_SCHR1, START_CHAR(tty));
+		sx_out(bp, CD186x_SCHR2, STOP_CHAR(tty));
+		sx_out(bp, CD186x_SCHR3, START_CHAR(tty));
+		sx_out(bp, CD186x_SCHR4, STOP_CHAR(tty));
+	}
+	if (!C_CLOCAL(tty)) {
+		/* Enable CD check */
+		port->IER |= IER_CD;
+		mcor1 |= MCOR1_CDZD;
+		mcor2 |= MCOR2_CDOD;
+	}
+	
+	if (C_CREAD(tty)) 
+		/* Enable receiver */
+		port->IER |= IER_RXD;
+	
+	/* Set input FIFO size (1-8 bytes) */
+	cor3 |= SPECIALIX_RXFIFO; 
+	/* Setting up CD186x channel registers */
+	sx_out(bp, CD186x_COR1, cor1);
+	sx_out(bp, CD186x_COR2, port->COR2);
+	sx_out(bp, CD186x_COR3, cor3);
+	/* Make CD186x know about registers change */
+	sx_wait_CCR(bp);
+	sx_out(bp, CD186x_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
+	/* Setting up modem option registers */
+#ifdef DEBUG_SPECIALIX
+	printk ("Mcor1 = %02x, mcor2 = %02x.\n", mcor1, mcor2);
+#endif
+	sx_out(bp, CD186x_MCOR1, mcor1);
+	sx_out(bp, CD186x_MCOR2, mcor2);
+	/* Enable CD186x transmitter & receiver */
+	sx_wait_CCR(bp);
+	sx_out(bp, CD186x_CCR, CCR_TXEN | CCR_RXEN);
+	/* Enable interrupts */
+	sx_out(bp, CD186x_IER, port->IER);
+	/* And finally set the modem lines... */
+	sx_out(bp, CD186x_MSVR, port->MSVR);
+}
+
+
+/* Must be called with interrupts enabled */
+static int sx_setup_port(struct specialix_board *bp, struct specialix_port *port)
+{
+	unsigned long flags;
+	
+	if (port->flags & ASYNC_INITIALIZED)
+		return 0;
+	
+	if (!port->xmit_buf) {
+		/* We may sleep in get_free_page() */
+		unsigned long tmp;
+		
+		if (!(tmp = get_free_page(GFP_KERNEL)))
+			return -ENOMEM;
+
+		if (port->xmit_buf) {
+			free_page(tmp);
+			return -ERESTARTSYS;
+		}
+		port->xmit_buf = (unsigned char *) tmp;
+	}
+		
+	save_flags(flags); cli();
+		
+	if (port->tty) 
+		clear_bit(TTY_IO_ERROR, &port->tty->flags);
+		
+	if (port->count == 1) 
+		bp->count++;
+		
+	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+	sx_change_speed(bp, port);
+	port->flags |= ASYNC_INITIALIZED;
+		
+	restore_flags(flags);
+	return 0;
+}
+
+
+/* Must be called with interrupts disabled */
+static void sx_shutdown_port(struct specialix_board *bp, struct specialix_port *port)
+{
+	struct tty_struct *tty;
+	
+	if (!(port->flags & ASYNC_INITIALIZED)) 
+		return;
+	
+#ifdef SX_REPORT_OVERRUN
+	printk(KERN_INFO "sx%d: port %d: Total %ld overruns were detected.\n",
+	       board_No(bp), port_No(port), port->overrun);
+#endif	
+#ifdef SX_REPORT_FIFO
+	{
+		int i;
+		
+		printk(KERN_INFO "sx%d: port %d: FIFO hits [ ",
+		       board_No(bp), port_No(port));
+		for (i = 0; i < 10; i++) {
+			printk("%ld ", port->hits[i]);
+		}
+		printk("].\n");
+	}
+#endif	
+	if (port->xmit_buf) {
+		free_page((unsigned long) port->xmit_buf);
+		port->xmit_buf = NULL;
+	}
+
+	/* Select port */
+	sx_out(bp, CD186x_CAR, port_No(port));
+
+	if (!(tty = port->tty) || C_HUPCL(tty)) {
+		/* Drop DTR */
+		sx_out(bp, CD186x_MSVDTR, 0);
+	}
+	
+	/* Reset port */
+	sx_wait_CCR(bp);
+	sx_out(bp, CD186x_CCR, CCR_SOFTRESET);
+	/* Disable all interrupts from this port */
+	port->IER = 0;
+	sx_out(bp, CD186x_IER, port->IER);
+	
+	if (tty)
+		set_bit(TTY_IO_ERROR, &tty->flags);
+	port->flags &= ~ASYNC_INITIALIZED;
+	
+	if (--bp->count < 0) {
+		printk(KERN_ERR "sx%d: sx_shutdown_port: bad board count: %d\n",
+		       board_No(bp), bp->count);
+		bp->count = 0;
+	}
+	
+	/*
+	 * If this is the last opened port on the board
+	 * shutdown whole board
+	 */
+	if (!bp->count) 
+		sx_shutdown_board(bp);
+}
+
+	
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+                           struct specialix_port *port)
+{
+	struct wait_queue wait = { current, NULL };
+	struct specialix_board *bp = port_Board(port);
+	int    retval;
+	int    do_clocal = 0;
+	int    CD;
+
+	/*
+	 * If the device is in the middle of being closed, then block
+	 * until it's done, and then try again.
+	 */
+	if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
+		interruptible_sleep_on(&port->close_wait);
+		if (port->flags & ASYNC_HUP_NOTIFY)
+			return -EAGAIN;
+		else
+			return -ERESTARTSYS;
+	}
+
+	/*
+	 * If this is a callout device, then just make sure the normal
+	 * device isn't being used.
+	 */
+	if (tty->driver.subtype == SPECIALIX_TYPE_CALLOUT) {
+		if (port->flags & ASYNC_NORMAL_ACTIVE)
+			return -EBUSY;
+		if ((port->flags & ASYNC_CALLOUT_ACTIVE) &&
+		    (port->flags & ASYNC_SESSION_LOCKOUT) &&
+		    (port->session != current->session))
+			return -EBUSY;
+		if ((port->flags & ASYNC_CALLOUT_ACTIVE) &&
+		    (port->flags & ASYNC_PGRP_LOCKOUT) &&
+		    (port->pgrp != current->pgrp))
+			return -EBUSY;
+		port->flags |= ASYNC_CALLOUT_ACTIVE;
+		return 0;
+	}
+	
+	/*
+	 * If non-blocking mode is set, or the port is not enabled,
+	 * then make the check up front and then exit.
+	 */
+	if ((filp->f_flags & O_NONBLOCK) ||
+	    (tty->flags & (1 << TTY_IO_ERROR))) {
+		if (port->flags & ASYNC_CALLOUT_ACTIVE)
+			return -EBUSY;
+		port->flags |= ASYNC_NORMAL_ACTIVE;
+		return 0;
+	}
+
+	if (port->flags & ASYNC_CALLOUT_ACTIVE) {
+		if (port->normal_termios.c_cflag & CLOCAL) 
+			do_clocal = 1;
+	} else {
+		if (C_CLOCAL(tty))
+			do_clocal = 1;
+	}
+	
+	/*
+	 * Block waiting for the carrier detect and the line to become
+	 * free (i.e., not in use by the callout).  While we are in
+	 * this loop, info->count is dropped by one, so that
+	 * rs_close() knows when to free things.  We restore it upon
+	 * exit, either normal or abnormal.
+	 */
+	retval = 0;
+	add_wait_queue(&port->open_wait, &wait);
+	cli();
+	if (!tty_hung_up_p(filp))
+		port->count--;
+	sti();
+	port->blocked_open++;
+	while (1) {
+		cli();
+		sx_out(bp, CD186x_CAR, port_No(port));
+		CD = sx_in(bp, CD186x_MSVR) & MSVR_CD;
+		if (!(port->flags & ASYNC_CALLOUT_ACTIVE)) {
+			if (SX_CRTSCTS (tty)) {
+				/* Activate RTS */
+				port->MSVR |= MSVR_DTR;
+				sx_out (bp, CD186x_MSVR, port->MSVR);
+			} else {
+				/* Activate DTR */
+				port->MSVR |= MSVR_DTR;
+				sx_out (bp, CD186x_MSVR, port->MSVR);
+			} 
+		}
+		sti();
+		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_CALLOUT_ACTIVE) &&
+		    !(port->flags & ASYNC_CLOSING) &&
+		    (do_clocal || CD))
+			break;
+		if (signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+		schedule();
+	}
+	current->state = TASK_RUNNING;
+	remove_wait_queue(&port->open_wait, &wait);
+	if (!tty_hung_up_p(filp))
+		port->count++;
+	port->blocked_open--;
+	if (retval)
+		return retval;
+	
+	port->flags |= ASYNC_NORMAL_ACTIVE;
+	return 0;
+}	
+
+
+static int sx_open(struct tty_struct * tty, struct file * filp)
+{
+	int board;
+	int error;
+	struct specialix_port * port;
+	struct specialix_board * bp;
+	unsigned long flags;
+	
+	board = SX_BOARD(MINOR(tty->device));
+
+	if (board > SX_NBOARD || !(sx_board[board].flags & SX_BOARD_PRESENT))
+		return -ENODEV;
+	
+	bp = &sx_board[board];
+	port = sx_port + board * SX_NPORT + SX_PORT(MINOR(tty->device));
+
+#ifdef DEBUG_SPECIALIX
+	printk (KERN_DEBUG "Board = %d, bp = %p, port = %p, portno = %d.\n", 
+	        board, bp, port, SX_PORT(MINOR(tty->device)));
+#endif
+
+	if (sx_paranoia_check(port, tty->device, "sx_open"))
+		return -ENODEV;
+
+	if ((error = sx_setup_board(bp)))
+		return error;
+
+	port->count++;
+	tty->driver_data = port;
+	port->tty = tty;
+
+	if ((error = sx_setup_port(bp, port))) 
+		return error;
+	
+	if ((error = block_til_ready(tty, filp, port)))
+		return error;
+
+	if ((port->count == 1) && (port->flags & ASYNC_SPLIT_TERMIOS)) {
+		if (tty->driver.subtype == SPECIALIX_TYPE_NORMAL)
+			*tty->termios = port->normal_termios;
+		else
+			*tty->termios = port->callout_termios;
+		save_flags(flags); cli();
+		sx_change_speed(bp, port);
+		restore_flags(flags);
+	}
+
+	port->session = current->session;
+	port->pgrp = current->pgrp;
+	return 0;
+}
+
+
+static void sx_close(struct tty_struct * tty, struct file * filp)
+{
+	struct specialix_port *port = (struct specialix_port *) tty->driver_data;
+	struct specialix_board *bp;
+	unsigned long flags;
+	unsigned long timeout;
+	
+	if (!port || sx_paranoia_check(port, tty->device, "close"))
+		return;
+	
+	save_flags(flags); cli();
+	if (tty_hung_up_p(filp)) {
+		restore_flags(flags);
+		return;
+	}
+	
+	bp = port_Board(port);
+	if ((tty->count == 1) && (port->count != 1)) {
+		printk(KERN_ERR "sx%d: sx_close: bad port count;"
+		       " tty->count is 1, port count is %d\n",
+		       board_No(bp), port->count);
+		port->count = 1;
+	}
+	if (--port->count < 0) {
+		printk(KERN_ERR "sx%d: sx_close: bad port count for tty%d: %d\n",
+		       board_No(bp), port_No(port), port->count);
+		port->count = 0;
+	}
+	if (port->count) {
+		restore_flags(flags);
+		return;
+	}
+	port->flags |= ASYNC_CLOSING;
+	/*
+	 * Save the termios structure, since this port may have
+	 * separate termios for callout and dialin.
+	 */
+	if (port->flags & ASYNC_NORMAL_ACTIVE)
+		port->normal_termios = *tty->termios;
+	if (port->flags & ASYNC_CALLOUT_ACTIVE)
+		port->callout_termios = *tty->termios;
+	/*
+	 * Now we wait for the transmit buffer to clear; and we notify 
+	 * the line discipline to only process XON/XOFF characters.
+	 */
+	tty->closing = 1;
+	if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+		tty_wait_until_sent(tty, port->closing_wait);
+	/*
+	 * At this point we stop accepting input.  To do this, we
+	 * disable the receive line status interrupts, and tell the
+	 * interrupt driver to stop checking the data ready bit in the
+	 * line status register.
+	 */
+	port->IER &= ~IER_RXD;
+	if (port->flags & ASYNC_INITIALIZED) {
+		port->IER &= ~IER_TXRDY;
+		port->IER |= IER_TXEMPTY;
+		sx_out(bp, CD186x_CAR, port_No(port));
+		sx_out(bp, CD186x_IER, port->IER);
+		/*
+		 * Before we drop DTR, make sure the UART transmitter
+		 * has completely drained; this is especially
+		 * important if there is a transmit FIFO!
+		 */
+		timeout = jiffies+HZ;
+		while(port->IER & IER_TXEMPTY) {
+			current->state = TASK_INTERRUPTIBLE;
+			current->timeout = jiffies + port->timeout;
+			schedule();
+			if (jiffies > timeout) {
+				printk (KERN_INFO "Timeout waiting for close\n");
+				break;
+			}
+		}
+
+	}
+	sx_shutdown_port(bp, port);
+	if (tty->driver.flush_buffer)
+		tty->driver.flush_buffer(tty);
+	if (tty->ldisc.flush_buffer)
+		tty->ldisc.flush_buffer(tty);
+	tty->closing = 0;
+	port->event = 0;
+	port->tty = 0;
+	if (port->blocked_open) {
+		if (port->close_delay) {
+			current->state = TASK_INTERRUPTIBLE;
+			current->timeout = jiffies + port->close_delay;
+			schedule();
+		}
+		wake_up_interruptible(&port->open_wait);
+	}
+	port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
+			 ASYNC_CLOSING);
+	wake_up_interruptible(&port->close_wait);
+	restore_flags(flags);
+}
+
+
+static int sx_write(struct tty_struct * tty, int from_user, 
+                    const unsigned char *buf, int count)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	struct specialix_board *bp;
+	int c, total = 0;
+	unsigned long flags;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_write"))
+		return 0;
+	
+	bp = port_Board(port);
+
+	if (!tty || !port->xmit_buf || !tmp_buf)
+		return 0;
+
+	if (from_user)
+		down(&tmp_buf_sem);
+
+	save_flags(flags);
+	while (1) {
+		cli();		
+		c = MIN(count, MIN(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
+		                   SERIAL_XMIT_SIZE - port->xmit_head));
+		if (c <= 0)
+			break;
+
+		if (from_user) {
+			copy_from_user(tmp_buf, buf, c);
+			c = MIN(c, MIN(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
+			               SERIAL_XMIT_SIZE - port->xmit_head));
+			memcpy(port->xmit_buf + port->xmit_head, tmp_buf, c);
+		} else
+			memcpy(port->xmit_buf + port->xmit_head, buf, c);
+		port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
+		port->xmit_cnt += c;
+		restore_flags(flags);
+		buf += c;
+		count -= c;
+		total += c;
+	}
+	if (from_user)
+		up(&tmp_buf_sem);
+	if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
+	    !(port->IER & IER_TXRDY)) {
+		port->IER |= IER_TXRDY;
+		sx_out(bp, CD186x_CAR, port_No(port));
+		sx_out(bp, CD186x_IER, port->IER);
+	}
+	restore_flags(flags);
+	return total;
+}
+
+
+static void sx_put_char(struct tty_struct * tty, unsigned char ch)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	unsigned long flags;
+
+	if (sx_paranoia_check(port, tty->device, "sx_put_char"))
+		return;
+
+	if (!tty || !port->xmit_buf)
+		return;
+
+	save_flags(flags); cli();
+	
+	if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
+		restore_flags(flags);
+		return;
+	}
+
+	port->xmit_buf[port->xmit_head++] = ch;
+	port->xmit_head &= SERIAL_XMIT_SIZE - 1;
+	port->xmit_cnt++;
+	restore_flags(flags);
+}
+
+
+static void sx_flush_chars(struct tty_struct * tty)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	unsigned long flags;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_flush_chars"))
+		return;
+	
+	if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+	    !port->xmit_buf)
+		return;
+
+	save_flags(flags); cli();
+	port->IER |= IER_TXRDY;
+	sx_out(port_Board(port), CD186x_CAR, port_No(port));
+	sx_out(port_Board(port), CD186x_IER, port->IER);
+	restore_flags(flags);
+}
+
+
+static int sx_write_room(struct tty_struct * tty)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	int	ret;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_write_room"))
+		return 0;
+
+	ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
+	if (ret < 0)
+		ret = 0;
+	return ret;
+}
+
+
+static int sx_chars_in_buffer(struct tty_struct *tty)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_chars_in_buffer"))
+		return 0;
+	
+	return port->xmit_cnt;
+}
+
+
+static void sx_flush_buffer(struct tty_struct *tty)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	unsigned long flags;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_flush_buffer"))
+		return;
+
+	save_flags(flags); cli();
+	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+	restore_flags(flags);
+	
+	wake_up_interruptible(&tty->write_wait);
+	if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+	    tty->ldisc.write_wakeup)
+		(tty->ldisc.write_wakeup)(tty);
+}
+
+
+static int sx_get_modem_info(struct specialix_port * port, unsigned int *value)
+{
+	struct specialix_board * bp;
+	unsigned char status;
+	unsigned int result;
+	unsigned long flags;
+
+	bp = port_Board(port);
+	save_flags(flags); cli();
+	sx_out(bp, CD186x_CAR, port_No(port));
+	status = sx_in(bp, CD186x_MSVR);
+	restore_flags(flags);
+#ifdef DEBUG_SPECIALIX
+	printk (KERN_DEBUG "Got msvr[%d] = %02x, car = %d.\n", 
+		port_No(port), status, sx_in (bp, CD186x_CAR));
+	printk (KERN_DEBUG "sx_port = %p, port = %p\n", sx_port, port);
+#endif
+	if (SX_CRTSCTS(port->tty)) {
+		result  = /*   (status & MSVR_RTS) ? */ TIOCM_DTR /* : 0) */ 
+		          |   ((status & MSVR_DTR) ? TIOCM_RTS : 0)
+		          |   ((status & MSVR_CD)  ? TIOCM_CAR : 0)
+		          |/* ((status & MSVR_DSR) ? */ TIOCM_DSR /* : 0) */
+		          |   ((status & MSVR_CTS) ? TIOCM_CTS : 0);
+	} else {
+		result  = /*   (status & MSVR_RTS) ? */ TIOCM_RTS /* : 0) */ 
+		          |   ((status & MSVR_DTR) ? TIOCM_DTR : 0)
+		          |   ((status & MSVR_CD)  ? TIOCM_CAR : 0)
+		          |/* ((status & MSVR_DSR) ? */ TIOCM_DSR /* : 0) */
+		          |   ((status & MSVR_CTS) ? TIOCM_CTS : 0);
+	}
+	put_user(result,(unsigned long *) value);
+	return 0;
+}
+
+
+static int sx_set_modem_info(struct specialix_port * port, unsigned int cmd,
+                             unsigned int *value)
+{
+	int error;
+	unsigned int arg;
+	unsigned long flags;
+	struct specialix_board *bp = port_Board(port);
+
+	error = verify_area(VERIFY_READ, value, sizeof(int));
+	if (error) 
+		return error;
+
+	Get_user(arg, (unsigned long *) value);
+	switch (cmd) {
+	case TIOCMBIS: 
+	   /*	if (arg & TIOCM_RTS) 
+			port->MSVR |= MSVR_RTS; */
+	   /*   if (arg & TIOCM_DTR)
+			port->MSVR |= MSVR_DTR; */
+
+		if (SX_CRTSCTS(port->tty)) {
+			if (arg & TIOCM_RTS)
+				port->MSVR |= MSVR_DTR; 
+		} else {
+			if (arg & TIOCM_DTR)
+				port->MSVR |= MSVR_DTR; 
+		}	     
+		break;
+	case TIOCMBIC:
+	  /*	if (arg & TIOCM_RTS)
+			port->MSVR &= ~MSVR_RTS; */
+	  /*    if (arg & TIOCM_DTR)
+			port->MSVR &= ~MSVR_DTR; */
+		if (SX_CRTSCTS(port->tty)) {
+			if (arg & TIOCM_RTS)
+				port->MSVR &= ~MSVR_DTR;
+		} else {
+			if (arg & TIOCM_DTR)
+				port->MSVR &= ~MSVR_DTR;
+		}
+		break;
+	case TIOCMSET:
+	  /* port->MSVR = (arg & TIOCM_RTS) ? (port->MSVR | MSVR_RTS) : 
+						 (port->MSVR & ~MSVR_RTS); */
+	  /* port->MSVR = (arg & TIOCM_DTR) ? (port->MSVR | MSVR_DTR) : 
+						 (port->MSVR & ~MSVR_DTR); */
+		if (SX_CRTSCTS(port->tty)) {
+	  		port->MSVR = (arg & TIOCM_RTS) ? 
+			                         (port->MSVR |  MSVR_DTR) : 
+			                         (port->MSVR & ~MSVR_DTR);
+		} else {
+			port->MSVR = (arg & TIOCM_DTR) ?
+			                         (port->MSVR |  MSVR_DTR):
+			                         (port->MSVR & ~MSVR_DTR);
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+	save_flags(flags); cli();
+	sx_out(bp, CD186x_CAR, port_No(port));
+	sx_out(bp, CD186x_MSVR, port->MSVR);
+	restore_flags(flags);
+	return 0;
+}
+
+
+extern inline void sx_send_break(struct specialix_port * port, unsigned long length)
+{
+	struct specialix_board *bp = port_Board(port);
+	unsigned long flags;
+	
+	save_flags(flags); cli();
+	port->break_length = SPECIALIX_TPS / HZ * length;
+	port->COR2 |= COR2_ETC;
+	port->IER  |= IER_TXRDY;
+	sx_out(bp, CD186x_CAR, port_No(port));
+	sx_out(bp, CD186x_COR2, port->COR2);
+	sx_out(bp, CD186x_IER, port->IER);
+	sx_wait_CCR(bp);
+	sx_out(bp, CD186x_CCR, CCR_CORCHG2);
+	sx_wait_CCR(bp);
+	restore_flags(flags);
+}
+
+
+extern inline int sx_set_serial_info(struct specialix_port * port,
+                                     struct serial_struct * newinfo)
+{
+	struct serial_struct tmp;
+	struct specialix_board *bp = port_Board(port);
+	int change_speed;
+	unsigned long flags;
+	int error;
+	
+	error = verify_area(VERIFY_READ, (void *) newinfo, sizeof(tmp));
+	if (error)
+		return error;
+
+	copy_from_user(&tmp, newinfo, sizeof(tmp));
+	
+#if 0	
+	if ((tmp.irq != bp->irq) ||
+	    (tmp.port != bp->base) ||
+	    (tmp.type != PORT_CIRRUS) ||
+	    (tmp.baud_base != (SX_OSCFREQ + CD186x_TPC/2) / CD186x_TPC) ||
+	    (tmp.custom_divisor != 0) ||
+	    (tmp.xmit_fifo_size != CD186x_NFIFO) ||
+	    (tmp.flags & ~SPECIALIX_LEGAL_FLAGS))
+		return -EINVAL;
+#endif	
+
+	change_speed = ((port->flags & ASYNC_SPD_MASK) !=
+			(tmp.flags & ASYNC_SPD_MASK));
+	
+	if (!suser()) {
+		if ((tmp.close_delay != port->close_delay) ||
+		    (tmp.closing_wait != port->closing_wait) ||
+		    ((tmp.flags & ~ASYNC_USR_MASK) !=
+		     (port->flags & ~ASYNC_USR_MASK)))
+			return -EPERM;
+		port->flags = ((port->flags & ~ASYNC_USR_MASK) |
+		                  (tmp.flags & ASYNC_USR_MASK));
+	} else {
+		port->flags = ((port->flags & ~ASYNC_FLAGS) |
+		                  (tmp.flags & ASYNC_FLAGS));
+		port->close_delay = tmp.close_delay;
+		port->closing_wait = tmp.closing_wait;
+	}
+	if (change_speed) {
+		save_flags(flags); cli();
+		sx_change_speed(bp, port);
+		restore_flags(flags);
+	}
+	return 0;
+}
+
+
+extern inline int sx_get_serial_info(struct specialix_port * port,
+				     struct serial_struct * retinfo)
+{
+	struct serial_struct tmp;
+	struct specialix_board *bp = port_Board(port);
+	int error;
+	
+	error = verify_area(VERIFY_WRITE, (void *) retinfo, sizeof(tmp));
+	if (error)
+		return error;
+
+	memset(&tmp, 0, sizeof(tmp));
+	tmp.type = PORT_CIRRUS;
+	tmp.line = port - sx_port;
+	tmp.port = bp->base;
+	tmp.irq  = bp->irq;
+	tmp.flags = port->flags;
+	tmp.baud_base = (SX_OSCFREQ + CD186x_TPC/2) / CD186x_TPC;
+	tmp.close_delay = port->close_delay * HZ/100;
+	tmp.closing_wait = port->closing_wait * HZ/100;
+	tmp.xmit_fifo_size = CD186x_NFIFO;
+	copy_to_user(retinfo, &tmp, sizeof(tmp));
+	return 0;
+}
+
+
+static int sx_ioctl(struct tty_struct * tty, struct file * filp, 
+                    unsigned int cmd, unsigned long arg)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	int error;
+	int retval;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_ioctl"))
+		return -ENODEV;
+	
+	switch (cmd) {
+	 case TCSBRK:	/* SVID version: non-zero arg --> no break */
+		retval = tty_check_change(tty);
+		if (retval)
+			return retval;
+		tty_wait_until_sent(tty, 0);
+		if (!arg)
+			sx_send_break(port, HZ/4);	/* 1/4 second */
+		return 0;
+	 case TCSBRKP:	/* support for POSIX tcsendbreak() */
+		retval = tty_check_change(tty);
+		if (retval)
+			return retval;
+		tty_wait_until_sent(tty, 0);
+		sx_send_break(port, arg ? arg*(HZ/10) : HZ/4);
+		return 0;
+	 case TIOCGSOFTCAR:
+		error = verify_area(VERIFY_WRITE, (void *) arg, sizeof(long));
+		if (error)
+			return error;
+		put_user(C_CLOCAL(tty) ? 1 : 0,
+		         (unsigned long *) arg);
+		return 0;
+	 case TIOCSSOFTCAR:
+		Get_user(arg, (unsigned long *) arg);
+		tty->termios->c_cflag =
+			((tty->termios->c_cflag & ~CLOCAL) |
+			(arg ? CLOCAL : 0));
+		return 0;
+	 case TIOCMGET:
+		error = verify_area(VERIFY_WRITE, (void *) arg,
+		                    sizeof(unsigned int));
+		if (error)
+			return error;
+		return sx_get_modem_info(port, (unsigned int *) arg);
+	 case TIOCMBIS:
+	 case TIOCMBIC:
+	 case TIOCMSET:
+		return sx_set_modem_info(port, cmd, (unsigned int *) arg);
+	 case TIOCGSERIAL:	
+		return sx_get_serial_info(port, (struct serial_struct *) arg);
+	 case TIOCSSERIAL:	
+		return sx_set_serial_info(port, (struct serial_struct *) arg);
+	 default:
+		return -ENOIOCTLCMD;
+	}
+	return 0;
+}
+
+
+static void sx_throttle(struct tty_struct * tty)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	struct specialix_board *bp;
+	unsigned long flags;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_throttle"))
+		return;
+	
+	bp = port_Board(port);
+	
+	save_flags(flags); cli();
+
+	/* Use DTR instead of RTS ! */
+	if (SX_CRTSCTS (tty)) 
+		port->MSVR &= ~MSVR_DTR;
+	else {
+		/* Auch!!! I think the system shouldn't call this then. */
+		/* Or maybe we're supposed (allowed?) to do our side of hw
+		   handshake anyway, even when hardware handshake is off. 
+		   When you see this in your logs, please report.... */
+		printk (KERN_ERR "sx%d: Need to throttle, but can't (hardware hs is off)\n",
+	                 port_No (port));
+	}
+	sx_out(bp, CD186x_CAR, port_No(port));
+	if (I_IXOFF(tty)) {
+		sx_wait_CCR(bp);
+		sx_out(bp, CD186x_CCR, CCR_SSCH2);
+		sx_wait_CCR(bp);
+	}
+	sx_out(bp, CD186x_MSVR, port->MSVR);
+	restore_flags(flags);
+}
+
+
+static void sx_unthrottle(struct tty_struct * tty)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	struct specialix_board *bp;
+	unsigned long flags;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_unthrottle"))
+		return;
+	
+	bp = port_Board(port);
+	
+	save_flags(flags); cli();
+	/* XXXX Use DTR INSTEAD???? */
+	if (SX_CRTSCTS(tty)) {
+		port->MSVR |= MSVR_DTR;
+	} /* Else clause: see remark in "sx_throttle"... */
+
+	sx_out(bp, CD186x_CAR, port_No(port));
+	if (I_IXOFF(tty)) {
+		sx_wait_CCR(bp);
+		sx_out(bp, CD186x_CCR, CCR_SSCH1);
+		sx_wait_CCR(bp);
+	}
+	sx_out(bp, CD186x_MSVR, port->MSVR);
+	restore_flags(flags);
+}
+
+
+static void sx_stop(struct tty_struct * tty)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	struct specialix_board *bp;
+	unsigned long flags;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_stop"))
+		return;
+	
+	bp = port_Board(port);
+	
+	save_flags(flags); cli();
+	port->IER &= ~IER_TXRDY;
+	sx_out(bp, CD186x_CAR, port_No(port));
+	sx_out(bp, CD186x_IER, port->IER);
+	restore_flags(flags);
+}
+
+
+static void sx_start(struct tty_struct * tty)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	struct specialix_board *bp;
+	unsigned long flags;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_start"))
+		return;
+	
+	bp = port_Board(port);
+	
+	save_flags(flags); cli();
+	if (port->xmit_cnt && port->xmit_buf && !(port->IER & IER_TXRDY)) {
+		port->IER |= IER_TXRDY;
+		sx_out(bp, CD186x_CAR, port_No(port));
+		sx_out(bp, CD186x_IER, port->IER);
+	}
+	restore_flags(flags);
+}
+
+
+/*
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred.  The path of
+ * hangup processing is:
+ *
+ * 	serial interrupt routine -> (scheduler tqueue) ->
+ * 	do_sx_hangup() -> tty->hangup() -> sx_hangup()
+ * 
+ */
+static void do_sx_hangup(void *private_)
+{
+	struct specialix_port	*port = (struct specialix_port *) private_;
+	struct tty_struct	*tty;
+	
+	tty = port->tty;
+	if (!tty)
+		return;
+
+	tty_hangup(tty);
+}
+
+
+static void sx_hangup(struct tty_struct * tty)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	struct specialix_board *bp;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_hangup"))
+		return;
+	
+	bp = port_Board(port);
+	
+	sx_shutdown_port(bp, port);
+	port->event = 0;
+	port->count = 0;
+	port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
+	port->tty = 0;
+	wake_up_interruptible(&port->open_wait);
+}
+
+
+static void sx_set_termios(struct tty_struct * tty, struct termios * old_termios)
+{
+	struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+	unsigned long flags;
+				
+	if (sx_paranoia_check(port, tty->device, "sx_set_termios"))
+		return;
+	
+	if (tty->termios->c_cflag == old_termios->c_cflag &&
+	    tty->termios->c_iflag == old_termios->c_iflag)
+		return;
+
+	save_flags(flags); cli();
+	sx_change_speed(port_Board(port), port);
+	restore_flags(flags);
+
+	if ((old_termios->c_cflag & CRTSCTS) &&
+	    !(tty->termios->c_cflag & CRTSCTS)) {
+		tty->hw_stopped = 0;
+		sx_start(tty);
+	}
+}
+
+
+static void do_specialix_bh(void)
+{
+	 run_task_queue(&tq_specialix);
+}
+
+
+static void do_softint(void *private_)
+{
+	struct specialix_port	*port = (struct specialix_port *) private_;
+	struct tty_struct	*tty;
+	
+	if(!(tty = port->tty)) 
+		return;
+
+	if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &port->event)) {
+		if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+		    tty->ldisc.write_wakeup)
+			(tty->ldisc.write_wakeup)(tty);
+		wake_up_interruptible(&tty->write_wait);
+	}
+}
+
+
+static int sx_init_drivers(void)
+{
+	int error;
+	int i;
+
+	
+	if (!(tmp_buf = (unsigned char *) get_free_page(GFP_KERNEL))) {
+		printk(KERN_ERR "sx: Couldn't get free page.\n");
+		return 1;
+	}
+	init_bh(SPECIALIX_BH, do_specialix_bh);
+	memset(IRQ_to_board, 0, sizeof(IRQ_to_board));
+	memset(&specialix_driver, 0, sizeof(specialix_driver));
+	specialix_driver.magic = TTY_DRIVER_MAGIC;
+	specialix_driver.name = "ttyW";
+	specialix_driver.major = SPECIALIX_NORMAL_MAJOR;
+	specialix_driver.num = SX_NBOARD * SX_NPORT;
+	specialix_driver.type = TTY_DRIVER_TYPE_SERIAL;
+	specialix_driver.subtype = SPECIALIX_TYPE_NORMAL;
+	specialix_driver.init_termios = tty_std_termios;
+	specialix_driver.init_termios.c_cflag =
+		B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+	specialix_driver.flags = TTY_DRIVER_REAL_RAW;
+	specialix_driver.refcount = &specialix_refcount;
+	specialix_driver.table = specialix_table;
+	specialix_driver.termios = specialix_termios;
+	specialix_driver.termios_locked = specialix_termios_locked;
+
+	specialix_driver.open  = sx_open;
+	specialix_driver.close = sx_close;
+	specialix_driver.write = sx_write;
+	specialix_driver.put_char = sx_put_char;
+	specialix_driver.flush_chars = sx_flush_chars;
+	specialix_driver.write_room = sx_write_room;
+	specialix_driver.chars_in_buffer = sx_chars_in_buffer;
+	specialix_driver.flush_buffer = sx_flush_buffer;
+	specialix_driver.ioctl = sx_ioctl;
+	specialix_driver.throttle = sx_throttle;
+	specialix_driver.unthrottle = sx_unthrottle;
+	specialix_driver.set_termios = sx_set_termios;
+	specialix_driver.stop = sx_stop;
+	specialix_driver.start = sx_start;
+	specialix_driver.hangup = sx_hangup;
+
+	specialix_callout_driver = specialix_driver;
+	specialix_callout_driver.name = "cuw";
+	specialix_callout_driver.major = SPECIALIX_CALLOUT_MAJOR;
+	specialix_callout_driver.subtype = SPECIALIX_TYPE_CALLOUT;
+	
+	if ((error = tty_register_driver(&specialix_driver))) {
+		free_page((unsigned long)tmp_buf);
+		printk(KERN_ERR "sx: Couldn't register specialix IO8+ driver, error = %d\n",
+		       error);
+		return 1;
+	}
+	if ((error = tty_register_driver(&specialix_callout_driver))) {
+		free_page((unsigned long)tmp_buf);
+		tty_unregister_driver(&specialix_driver);
+		printk(KERN_ERR "sx: Couldn't register specialix IO8+ callout driver, error = %d\n",
+		       error);
+		return 1;
+	}
+	
+	memset(sx_port, 0, sizeof(sx_port));
+	for (i = 0; i < SX_NPORT * SX_NBOARD; i++) {
+		sx_port[i].callout_termios = specialix_callout_driver.init_termios;
+		sx_port[i].normal_termios  = specialix_driver.init_termios;
+		sx_port[i].magic = SPECIALIX_MAGIC;
+		sx_port[i].tqueue.routine = do_softint;
+		sx_port[i].tqueue.data = &sx_port[i];
+		sx_port[i].tqueue_hangup.routine = do_sx_hangup;
+		sx_port[i].tqueue_hangup.data = &sx_port[i];
+		sx_port[i].close_delay = 50 * HZ/100;
+		sx_port[i].closing_wait = 3000 * HZ/100;
+	}
+	
+	return 0;
+}
+
+
+static void sx_release_drivers(void)
+{
+	free_page((unsigned long)tmp_buf);
+	tty_unregister_driver(&specialix_driver);
+	tty_unregister_driver(&specialix_callout_driver);
+}
+
+
+#ifndef MODULE
+/*
+ * Called at boot time.
+ * 
+ * You can specify IO base for up to SX_NBOARD cards,
+ * using line "specialix=0xiobase1,0xiobase2,.." at LILO prompt.
+ * Note that there will be no probing at default
+ * addresses in this case.
+ *
+ */ 
+void specialix_setup(char *str, int * ints)
+{
+	int i;
+        
+	for (i=0;i<SX_NBOARD;i++) {
+		sx_board[i].base = 0;
+	}
+
+	for (i = 1; i <= ints[0]; i++) {
+		if (i&1)
+			sx_board[i/2].base = ints[i];
+		else
+			sx_board[i/2 -1].irq = ints[i];
+	}
+}
+#endif
+
+/* 
+ * This routine must be called by kernel at boot time 
+ */
+int specialix_init(void) 
+{
+	int i;
+	int found = 0;
+
+	printk(KERN_INFO "sx: Specialix IO8+ driver v" VERSION ", (c) R.E.Wolff 1997.\n");
+	printk(KERN_INFO "sx: derived from work (c) D.Gorodchanin 1994-1996.\n");
+#ifdef CONFIG_SPECIALIX_RTSCTS
+	printk (KERN_INFO "sx: DTR/RTS pin is always RTS.\n");
+#else
+	printk (KERN_INFO "sx: DTR/RTS pin is RTS when CRTSCTS is on.\n");
+#endif
+	
+	if (sx_init_drivers()) 
+		return -EIO;
+
+	for (i = 0; i < SX_NBOARD; i++) 
+		if (sx_board[i].base && !sx_probe(&sx_board[i]))
+			found++;
+
+	if (!found) {
+		sx_release_drivers();
+		printk(KERN_INFO "sx: No specialix IO8+ boards detected.\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+#ifdef MODULE
+int iobase[SX_NBOARD]  = {0,};
+
+int irq [SX_NBOARD] = {0,};
+
+/*
+ * You can setup up to 4 boards.
+ * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
+ * 
+ * More than 4 boards in one computer is not possible, as the card can
+ * only use 4 different interrupts. 
+ *
+ */
+int init_module(void) 
+{
+	int i;
+
+	if (iobase[0] || iobase[1] || iobase[2] || iobase[3]) {
+		for(i = 0; i < SX_NBOARD; i++) {
+			sx_board[i].base = iobase[i];
+			sx_board[i].irq = irq[i];
+		}
+	}
+
+	return specialix_init();
+}
+	
+
+void cleanup_module(void)
+{
+	int i;
+	
+	sx_release_drivers();
+	for (i = 0; i < SX_NBOARD; i++)
+		if (sx_board[i].flags & SX_BOARD_PRESENT) 
+			sx_release_io_range(&sx_board[i]);
+#ifdef SPECIALIX_TIMER
+	del_timer (&missed_irq_timer);
+#endif
+	
+}
+#endif /* MODULE */