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, 2610 insertions, 0 deletions

diff --git a/drivers/char/specialix.c b/drivers/char/specialix.c
new file mode 100644
index 00000000000..c789d5ceac7
--- /dev/null
+++ b/drivers/char/specialix.c
@@ -0,0 +1,2610 @@
+/*
+ *      specialix.c  -- specialix IO8+ multiport serial driver.
+ *
+ *      Copyright (C) 1997  Roger Wolff (R.E.Wolff@BitWizard.nl)
+ *      Copyright (C) 1994-1996  Dmitry Gorodchanin (pgmdsg@ibi.com)
+ *
+ *      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.
+ * Revision 1.9:  Oct 9  1998
+ *                Added stuff for the IO8+/PCI version.
+ * Revision 1.10: Oct 22  1999 / Jan 21 2000. 
+ *                Added stuff for setserial. 
+ *                Nicolas Mailhot (Nicolas.Mailhot@email.enst.fr)
+ * 
+ */
+
+#define VERSION "1.11"
+
+
+/*
+ * 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/version.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+
+#include "specialix_io8.h"
+#include "cd1865.h"
+
+
+/*
+   This driver can spew a whole lot of debugging output at you. If you
+   need maximum performance, you should disable the DEBUG define. To
+   aid in debugging in the field, I'm leaving the compile-time debug
+   features enabled, and disable them "runtime". That allows me to
+   instruct people with problems to enable debugging without requiring
+   them to recompile...
+*/
+#define DEBUG
+
+static int sx_debug;
+static int sx_rxfifo = SPECIALIX_RXFIFO;
+
+#ifdef DEBUG
+#define dprintk(f, str...) if (sx_debug & f) printk (str)
+#else
+#define dprintk(f, str...) /* nothing */
+#endif
+
+#define SX_DEBUG_FLOW    0x0001
+#define SX_DEBUG_DATA    0x0002
+#define SX_DEBUG_PROBE   0x0004
+#define SX_DEBUG_CHAN    0x0008
+#define SX_DEBUG_INIT    0x0010
+#define SX_DEBUG_RX      0x0020
+#define SX_DEBUG_TX      0x0040
+#define SX_DEBUG_IRQ     0x0080
+#define SX_DEBUG_OPEN    0x0100
+#define SX_DEBUG_TERMIOS 0x0200
+#define SX_DEBUG_SIGNALS 0x0400
+#define SX_DEBUG_FIFO    0x0800
+
+
+#define func_enter() dprintk (SX_DEBUG_FLOW, "io8: enter %s\n",__FUNCTION__)
+#define func_exit()  dprintk (SX_DEBUG_FLOW, "io8: exit  %s\n", __FUNCTION__)
+
+#define jiffies_from_ms(a) ((((a) * HZ)/1000)+1)
+
+
+/* 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
+
+#ifdef SPECIALIX_TIMER
+static int sx_poll = HZ;
+#endif
+
+
+
+/* 
+ * 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)
+
+#undef RS_EVENT_WRITE_WAKEUP
+#define RS_EVENT_WRITE_WAKEUP	0
+
+static struct tty_driver *specialix_driver;
+static unsigned char * tmp_buf;
+static DECLARE_MUTEX(tmp_buf_sem);
+
+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];
+
+
+#ifdef SPECIALIX_TIMER
+static struct timer_list missed_irq_timer;
+static irqreturn_t sx_interrupt(int irq, void * dev_id, struct pt_regs * regs);
+#endif
+
+
+
+static inline int sx_paranoia_check(struct specialix_port const * port,
+				    char *name, 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, name, routine);
+		return 1;
+	}
+	if (port->magic != SPECIALIX_MAGIC) {
+		printk(badmagic, name, routine);
+		return 1;
+	}
+#endif
+	return 0;
+}
+
+
+/*
+ * 
+ *  Service functions for specialix IO8+ driver.
+ * 
+ */
+
+/* Get board number from pointer */
+static inline int board_No (struct specialix_board * bp)
+{
+	return bp - sx_board;
+}
+
+
+/* Get port number from pointer */
+static inline int port_No (struct specialix_port const * port)
+{
+	return SX_PORT(port - sx_port); 
+}
+
+
+/* Get pointer to board from pointer to port */
+static 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 */
+static 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 */
+static 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 */
+static 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 */
+static 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 */
+static inline void sx_wait_CCR(struct specialix_board  * bp)
+{
+	unsigned long delay, flags;
+	unsigned char ccr;
+
+	for (delay = SX_CCR_TIMEOUT; delay; delay--) {
+		spin_lock_irqsave(&bp->lock, flags);
+		ccr = sx_in(bp, CD186x_CCR);
+		spin_unlock_irqrestore(&bp->lock, flags);
+		if (!ccr)
+			return;
+		udelay (1);
+	}
+	
+	printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp));
+}
+
+
+/* Wait for Channel Command Register ready */
+static inline void sx_wait_CCR_off(struct specialix_board  * bp)
+{
+	unsigned long delay;
+	unsigned char crr;
+	unsigned long flags;
+
+	for (delay = SX_CCR_TIMEOUT; delay; delay--) {
+		spin_lock_irqsave(&bp->lock, flags);
+		crr = sx_in_off(bp, CD186x_CCR);
+		spin_unlock_irqrestore(&bp->lock, flags);
+		if (!crr)
+			return;
+		udelay (1);
+	}
+	
+	printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp));
+}
+
+
+/*
+ *  specialix IO8+ IO range functions.
+ */
+
+static inline int sx_check_io_range(struct specialix_board * bp)
+{
+	return check_region (bp->base, SX_IO_SPACE);
+}
+
+
+static inline void sx_request_io_range(struct specialix_board * bp)
+{
+	request_region(bp->base, 
+	               bp->flags&SX_BOARD_IS_PCI?SX_PCI_IO_SPACE:SX_IO_SPACE,
+	               "specialix IO8+" );
+}
+
+
+static inline void sx_release_io_range(struct specialix_board * bp)
+{
+	release_region(bp->base, 
+	               bp->flags&SX_BOARD_IS_PCI?SX_PCI_IO_SPACE:SX_IO_SPACE);
+}
+
+	
+/* Must be called with enabled interrupts */
+/* Ugly. Very ugly. Don't use this for anything else than initialization 
+   code */
+static inline void sx_long_delay(unsigned long delay)
+{
+	unsigned long i;
+	
+	for (i = jiffies + delay; time_after(i, jiffies); ) ;
+}
+
+
+
+/* Set the IRQ using the RTS lines that run to the PAL on the board.... */
+static int sx_set_irq ( struct specialix_board *bp)
+{
+	int virq;
+	int i;
+	unsigned long flags;
+
+	if (bp->flags & SX_BOARD_IS_PCI) 
+		return 1;
+	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;
+	}
+	spin_lock_irqsave(&bp->lock, flags);
+	for (i=0;i<2;i++) {
+		sx_out(bp, CD186x_CAR, i);
+		sx_out(bp, CD186x_MSVRTS, ((virq >> i) & 0x1)? MSVR_RTS:0);
+	}
+	spin_unlock_irqrestore(&bp->lock, flags);
+	return 1;
+}
+
+
+/* Reset and setup CD186x chip */
+static int sx_init_CD186x(struct specialix_board  * bp)
+{
+	unsigned long flags;
+	int scaler;
+	int rv = 1;
+
+	func_enter();
+	sx_wait_CCR_off(bp);			   /* Wait for CCR ready        */
+	spin_lock_irqsave(&bp->lock, flags);
+	sx_out_off(bp, CD186x_CCR, CCR_HARDRESET);      /* Reset CD186x chip          */
+	spin_unlock_irqrestore(&bp->lock, flags);
+	sx_long_delay(HZ/20);                      /* Delay 0.05 sec            */
+	spin_lock_irqsave(&bp->lock, flags);
+	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);
+	spin_unlock_irqrestore(&bp->lock, flags);
+
+	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;
+	}
+
+	func_exit();
+	return rv;
+}
+
+
+static int read_cross_byte (struct specialix_board *bp, int reg, int bit)
+{
+	int i;
+	int t;
+	unsigned long flags;
+
+	spin_lock_irqsave(&bp->lock, flags);
+	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;
+	}
+	spin_unlock_irqrestore(&bp->lock, flags);
+
+	return t;
+}
+
+
+#ifdef SPECIALIX_TIMER
+void missed_irq (unsigned long data)
+{
+	unsigned char irq;
+	unsigned long flags;
+	struct specialix_board  *bp = (struct specialix_board *)data;
+
+	spin_lock_irqsave(&bp->lock, flags);
+	irq = sx_in ((struct specialix_board *)data, CD186x_SRSR) &
+	                                            (SRSR_RREQint |
+	                                             SRSR_TREQint |
+	                                             SRSR_MREQint);
+	spin_unlock_irqrestore(&bp->lock, flags);
+	if (irq) {
+		printk (KERN_INFO "Missed interrupt... Calling int from timer. \n");
+		sx_interrupt (((struct specialix_board *)data)->irq, 
+		              (void*)data, NULL);
+	}
+	missed_irq_timer.expires = jiffies + sx_poll;
+	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;
+
+	func_enter();
+
+	if (sx_check_io_range(bp)) {
+		func_exit();
+		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);
+		func_exit();
+		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);
+	dprintk (SX_DEBUG_INIT, "sx%d: DSR lines are: %02x, rts lines are: %02x\n",
+	        board_No(bp),  val1, val2);
+
+	/* They managed to switch the bit order between the docs and
+	   the IO8+ card. The new PCI card now conforms to old docs.
+	   They changed the PCI docs to reflect the situation on the
+	   old card. */
+	val2 = (bp->flags & SX_BOARD_IS_PCI)?0x4d : 0xb2;
+	if (val1 != val2) {
+		printk(KERN_INFO "sx%d: specialix IO8+ ID %02x at 0x%03x not found (%02x).\n",
+		       board_No(bp), val2, bp->base, val1);
+		func_exit();
+		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);
+
+		dprintk (SX_DEBUG_INIT, "SRSR = %02x, ", sx_in(bp, CD186x_SRSR));
+		dprintk (SX_DEBUG_INIT, "TRAR = %02x, ", sx_in(bp, CD186x_TRAR));
+		dprintk (SX_DEBUG_INIT, "GIVR = %02x, ", sx_in(bp, CD186x_GIVR));
+		dprintk (SX_DEBUG_INIT, "GICR = %02x, ", sx_in(bp, CD186x_GICR));
+		dprintk (SX_DEBUG_INIT, "\n");
+
+		/* Reset CD186x again      */
+		if (!sx_init_CD186x(bp)) {
+			/* Hmmm. This is dead code anyway. */
+		}
+
+		dprintk (SX_DEBUG_INIT "val1 = %02x, val2 = %02x, val3 = %02x.\n",
+		        val1, val2, val3); 
+	
+	}
+	
+#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);
+		func_exit();
+		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)) {
+		func_exit();
+		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';
+	}
+
+	dprintk (SX_DEBUG_INIT, " GFCR = 0x%02x\n", sx_in_off(bp, CD186x_GFRCR) );
+
+#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 + sx_poll;
+	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);
+
+	func_exit();
+	return 0;
+}
+
+/* 
+ * 
+ *  Interrupt processing routines.
+ * */
+
+static inline void sx_mark_event(struct specialix_port * port, int event)
+{
+	func_enter();
+
+	set_bit(event, &port->event);
+	schedule_work(&port->tqueue);
+
+	func_exit();
+}
+
+
+static inline struct specialix_port * sx_get_port(struct specialix_board * bp,
+					       unsigned char const * what)
+{
+	unsigned char channel;
+	struct specialix_port * port = NULL;
+
+	channel = sx_in(bp, CD186x_GICR) >> GICR_CHAN_OFF;
+	dprintk (SX_DEBUG_CHAN, "channel: %d\n", channel);
+	if (channel < CD186x_NCH) {
+		port = &sx_port[board_No(bp) * SX_NPORT + channel];
+		dprintk (SX_DEBUG_CHAN, "port: %d %p flags: 0x%x\n",board_No(bp) * SX_NPORT + channel,  port, port->flags & ASYNC_INITIALIZED);
+
+		if (port->flags & ASYNC_INITIALIZED) {
+			dprintk (SX_DEBUG_CHAN, "port: %d %p\n", channel, port);
+			func_exit();
+			return port;
+		}
+	}
+	printk(KERN_INFO "sx%d: %s interrupt from invalid port %d\n", 
+	       board_No(bp), what, channel);
+	return NULL;
+}
+
+
+static inline void sx_receive_exc(struct specialix_board * bp)
+{
+	struct specialix_port *port;
+	struct tty_struct *tty;
+	unsigned char status;
+	unsigned char ch;
+
+	func_enter();
+
+	port = sx_get_port(bp, "Receive");
+	if (!port) {
+		dprintk (SX_DEBUG_RX, "Hmm, couldn't find port.\n");
+		func_exit();
+		return;
+	}
+	tty = port->tty;
+	dprintk (SX_DEBUG_RX, "port: %p count: %d BUFF_SIZE: %d\n",
+		 port,  tty->flip.count, TTY_FLIPBUF_SIZE);
+	
+	status = sx_in(bp, CD186x_RCSR);
+
+	dprintk (SX_DEBUG_RX, "status: 0x%x\n", status);
+	if (status & RCSR_OE) {
+		port->overrun++;
+		dprintk(SX_DEBUG_FIFO, "sx%d: port %d: Overrun. Total %ld overruns.\n",
+		       board_No(bp), port_No(port), port->overrun);
+	}
+	status &= port->mark_mask;
+
+	/* This flip buffer check needs to be below the reading of the
+	   status register to reset the chip's IRQ.... */
+	if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
+		dprintk(SX_DEBUG_FIFO, "sx%d: port %d: Working around flip buffer overflow.\n",
+		       board_No(bp), port_No(port));
+		func_exit();
+		return;
+	}
+
+	ch = sx_in(bp, CD186x_RDR);
+	if (!status) {
+		func_exit();
+		return;
+	}
+	if (status & RCSR_TOUT) {
+		printk(KERN_INFO "sx%d: port %d: Receiver timeout. Hardware problems ?\n", 
+		       board_No(bp), port_No(port));
+		func_exit();
+		return;
+		
+	} else if (status & RCSR_BREAK) {
+		dprintk(SX_DEBUG_RX, "sx%d: port %d: Handling break...\n",
+		       board_No(bp), port_No(port));
+		*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++;
+	schedule_delayed_work(&tty->flip.work, 1);
+
+	func_exit();
+}
+
+
+static inline void sx_receive(struct specialix_board * bp)
+{
+	struct specialix_port *port;
+	struct tty_struct *tty;
+	unsigned char count;
+
+	func_enter();
+	
+	if (!(port = sx_get_port(bp, "Receive"))) {
+		dprintk (SX_DEBUG_RX, "Hmm, couldn't find port.\n");
+		func_exit();
+		return;
+	}
+	tty = port->tty;
+	
+	count = sx_in(bp, CD186x_RDCR);
+	dprintk (SX_DEBUG_RX, "port: %p: count: %d\n", port, count);
+	port->hits[count > 8 ? 9 : count]++;
+	
+	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++;
+	}
+	schedule_delayed_work(&tty->flip.work, 1);
+
+	func_exit();
+}
+
+
+static inline void sx_transmit(struct specialix_board * bp)
+{
+	struct specialix_port *port;
+	struct tty_struct *tty;
+	unsigned char count;
+
+	func_enter();
+	if (!(port = sx_get_port(bp, "Transmit"))) {
+		func_exit();
+		return;
+	}
+	dprintk (SX_DEBUG_TX, "port: %p\n", port);
+	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);
+		func_exit();
+		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);
+		func_exit();
+		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_t(int, 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;
+		}
+
+		func_exit();
+		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);
+
+	func_exit();
+}
+
+
+static inline void sx_check_modem(struct specialix_board * bp)
+{
+	struct specialix_port *port;
+	struct tty_struct *tty;
+	unsigned char mcr;
+	int msvr_cd;
+
+	dprintk (SX_DEBUG_SIGNALS, "Modem intr. ");
+	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)) {
+		dprintk (SX_DEBUG_SIGNALS, "CD just changed... ");
+		msvr_cd = sx_in(bp, CD186x_MSVR) & MSVR_CD;
+		if (msvr_cd) {
+			dprintk (SX_DEBUG_SIGNALS, "Waking up guys in open.\n");
+			wake_up_interruptible(&port->open_wait);
+		} else {
+			dprintk (SX_DEBUG_SIGNALS, "Sending HUP.\n");
+			schedule_work(&port->tqueue_hangup);
+		}
+	}
+	
+#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 irqreturn_t 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;
+	unsigned long flags;
+
+	func_enter();
+
+	bp = dev_id;
+	spin_lock_irqsave(&bp->lock, flags);
+
+	dprintk (SX_DEBUG_FLOW, "enter %s port %d room: %ld\n", __FUNCTION__, port_No(sx_get_port(bp, "INT")), SERIAL_XMIT_SIZE - sx_get_port(bp, "ITN")->xmit_cnt - 1);
+	if (!bp || !(bp->flags & SX_BOARD_ACTIVE)) {
+		dprintk (SX_DEBUG_IRQ, "sx: False interrupt. irq %d.\n", irq);
+		spin_unlock_irqrestore(&bp->lock, flags);
+		func_exit();
+		return IRQ_NONE;
+	}
+
+	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: status: 0x%x Bad receive ack 0x%02x.\n",
+				       board_No(bp), status, 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: status: 0x%x Bad transmit ack 0x%02x. port: %d\n",
+				       board_No(bp), status, ack, port_No (sx_get_port (bp, "Int")));
+		} 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: status: 0x%x Bad modem ack 0x%02x.\n",
+				       board_No(bp), status, ack);
+		
+		} 
+
+		sx_out(bp, CD186x_EOIR, 0);   /* Mark end of interrupt */
+	}
+	bp->reg = saved_reg;
+	outb (bp->reg, bp->base + SX_ADDR_REG);
+	spin_unlock_irqrestore(&bp->lock, flags);
+	func_exit();
+	return IRQ_HANDLED;
+}
+
+
+/*
+ *  Routines for open & close processing.
+ */
+
+static void turn_ints_off (struct specialix_board *bp)
+{
+	unsigned long flags;
+
+	func_enter();
+	if (bp->flags & SX_BOARD_IS_PCI) {
+		/* This was intended for enabeling the interrupt on the
+		 * PCI card. However it seems that it's already enabled
+		 * and as PCI interrupts can be shared, there is no real
+		 * reason to have to turn it off. */
+	}
+
+	spin_lock_irqsave(&bp->lock, flags);
+	(void) sx_in_off (bp, 0); /* Turn off interrupts. */
+	spin_unlock_irqrestore(&bp->lock, flags);
+
+	func_exit();
+}
+
+static void turn_ints_on (struct specialix_board *bp)
+{
+	unsigned long flags;
+
+	func_enter();
+
+	if (bp->flags & SX_BOARD_IS_PCI) {
+		/* play with the PCI chip. See comment above. */
+	}
+	spin_lock_irqsave(&bp->lock, flags);
+	(void) sx_in (bp, 0); /* Turn ON interrupts. */
+	spin_unlock_irqrestore(&bp->lock, flags);
+
+	func_exit();
+}
+
+
+/* Called with disabled interrupts */
+static inline int sx_setup_board(struct specialix_board * bp)
+{
+	int error;
+
+	if (bp->flags & SX_BOARD_ACTIVE) 
+		return 0;
+
+	if (bp->flags & SX_BOARD_IS_PCI)
+		error = request_irq(bp->irq, sx_interrupt, SA_INTERRUPT | SA_SHIRQ, "specialix IO8+", bp);
+	else
+		error = request_irq(bp->irq, sx_interrupt, SA_INTERRUPT, "specialix IO8+", bp);
+
+	if (error) 
+		return error;
+
+	turn_ints_on (bp);
+	bp->flags |= SX_BOARD_ACTIVE;
+
+	return 0;
+}
+
+
+/* Called with disabled interrupts */
+static inline void sx_shutdown_board(struct specialix_board *bp)
+{
+	func_enter();
+
+	if (!(bp->flags & SX_BOARD_ACTIVE)) {
+		func_exit();
+		return;
+	}
+
+	bp->flags &= ~SX_BOARD_ACTIVE;
+	
+	dprintk (SX_DEBUG_IRQ, "Freeing IRQ%d for board %d.\n",
+		 bp->irq, board_No (bp));
+	free_irq(bp->irq, bp);
+
+	turn_ints_off (bp);
+
+
+	func_exit();
+}
+
+
+/*
+ * 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 unsigned long again;
+	unsigned long flags;
+
+	func_enter();
+
+	if (!(tty = port->tty) || !tty->termios) {
+		func_exit();
+		return;
+	}
+
+	port->IER  = 0;
+	port->COR2 = 0;
+	/* Select port on the board */
+	spin_lock_irqsave(&bp->lock, flags);
+	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);
+	spin_unlock_irqrestore(&bp->lock, flags);
+	dprintk (SX_DEBUG_TERMIOS, "sx: got MSVR=%02x.\n", port->MSVR);
+	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 */
+		dprintk (SX_DEBUG_TERMIOS, "Dropping DTR...  Hmm....\n");
+		if (!SX_CRTSCTS (tty)) {
+			port -> MSVR &= ~ MSVR_DTR;
+			spin_lock_irqsave(&bp->lock, flags);
+			sx_out(bp, CD186x_MSVR, port->MSVR );
+			spin_unlock_irqrestore(&bp->lock, flags);
+		} 
+		else
+			dprintk (SX_DEBUG_TERMIOS, "Can't drop DTR: no DTR.\n");
+		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 = port->custom_divisor ;
+	if ( tmp )
+		printk (KERN_INFO "sx%d: Using custom baud rate divisor %ld. \n"
+		                  "This is an untested option, please be carefull.\n",
+		                  port_No (port), tmp);
+	else
+		tmp = (((SX_OSCFREQ + baud_table[baud]/2) / baud_table[baud] +
+		         CD186x_TPC/2) / CD186x_TPC);
+
+	if ((tmp < 0x10) && time_before(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"
+			        "Read specialix.txt for more info.\n",
+			        port_No (p