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, 2621 insertions, 0 deletions

diff --git a/drivers/char/sx.c b/drivers/char/sx.c
new file mode 100644
index 000000000000..3ad758a9a1dc
--- /dev/null
+++ b/drivers/char/sx.c
@@ -0,0 +1,2621 @@
+
+/* sx.c -- driver for the Specialix SX series cards. 
+ *
+ *  This driver will also support the older SI, and XIO cards.
+ *
+ *
+ *   (C) 1998 - 2004  R.E.Wolff@BitWizard.nl
+ *
+ *  Simon Allen (simonallen@cix.compulink.co.uk) wrote a previous
+ *  version of this driver. Some fragments may have been copied. (none
+ *  yet :-)
+ *
+ * Specialix pays for the development and support of this driver.
+ * Please DO contact support@specialix.co.uk if you require
+ * support. But please read the documentation (sx.txt) first.
+ *
+ *
+ *
+ *      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:
+ * $Log: sx.c,v $
+ * Revision 1.33  2000/03/09 10:00:00  pvdl,wolff
+ * - Fixed module and port counting
+ * - Fixed signal handling
+ * - Fixed an Ooops
+ * 
+ * Revision 1.32  2000/03/07 09:00:00  wolff,pvdl
+ * - Fixed some sx_dprintk typos
+ * - added detection for an invalid board/module configuration
+ *
+ * Revision 1.31  2000/03/06 12:00:00  wolff,pvdl
+ * - Added support for EISA
+ *
+ * Revision 1.30  2000/01/21 17:43:06  wolff
+ * - Added support for SX+
+ *
+ * Revision 1.26  1999/08/05 15:22:14  wolff
+ * - Port to 2.3.x
+ * - Reformatted to Linus' liking.
+ *
+ * Revision 1.25  1999/07/30 14:24:08  wolff
+ * Had accidentally left "gs_debug" set to "-1" instead of "off" (=0).
+ *
+ * Revision 1.24  1999/07/28 09:41:52  wolff
+ * - I noticed the remark about use-count straying in sx.txt. I checked
+ *   sx_open, and found a few places where that could happen. I hope it's
+ *   fixed now.
+ *
+ * Revision 1.23  1999/07/28 08:56:06  wolff
+ * - Fixed crash when sx_firmware run twice.
+ * - Added sx_slowpoll as a module parameter (I guess nobody really wanted
+ *   to change it from the default... )
+ * - Fixed a stupid editing problem I introduced in 1.22.
+ * - Fixed dropping characters on a termios change.
+ *
+ * Revision 1.22  1999/07/26 21:01:43  wolff
+ * Russell Brown noticed that I had overlooked 4 out of six modem control
+ * signals in sx_getsignals. Ooops.
+ *
+ * Revision 1.21  1999/07/23 09:11:33  wolff
+ * I forgot to free dynamically allocated memory when the driver is unloaded.
+ *
+ * Revision 1.20  1999/07/20 06:25:26  wolff
+ * The "closing wait" wasn't honoured. Thanks to James Griffiths for
+ * reporting this.
+ *
+ * Revision 1.19  1999/07/11 08:59:59  wolff
+ * Fixed an oops in close, when an open was pending. Changed the memtest
+ * a bit. Should also test the board in word-mode, however my card fails the
+ * memtest then. I still have to figure out what is wrong...
+ *
+ * Revision 1.18  1999/06/10 09:38:42  wolff
+ * Changed the format of the firmware revision from %04x to %x.%02x .
+ *
+ * Revision 1.17  1999/06/04 09:44:35  wolff
+ * fixed problem: reference to pci stuff when config_pci was off...
+ * Thanks to Jorge Novo for noticing this.
+ *
+ * Revision 1.16  1999/06/02 08:30:15  wolff
+ * added/removed the workaround for the DCD bug in the Firmware.
+ * A bit more debugging code to locate that...
+ *
+ * Revision 1.15  1999/06/01 11:35:30  wolff
+ * when DCD is left low (floating?), on TA's the firmware first tells us
+ * that DCD is high, but after a short while suddenly comes to the
+ * conclusion that it is low. All this would be fine, if it weren't that
+ * Unix requires us to send a "hangup" signal in that case. This usually
+ * all happens BEFORE the program has had a chance to ioctl the device
+ * into clocal mode..
+ *
+ * Revision 1.14  1999/05/25 11:18:59  wolff
+ * Added PCI-fix.
+ * Added checks for return code of sx_sendcommand.
+ * Don't issue "reconfig" if port isn't open yet. (bit us on TA modules...)
+ *
+ * Revision 1.13  1999/04/29 15:18:01  wolff
+ * Fixed an "oops" that showed on SuSE 6.0 systems.
+ * Activate DTR again after stty 0.
+ *
+ * Revision 1.12  1999/04/29 07:49:52  wolff
+ * Improved "stty 0" handling a bit. (used to change baud to 9600 assuming
+ *     the connection would be dropped anyway. That is not always the case,
+ *     and confuses people).
+ * Told the card to always monitor the modem signals.
+ * Added support for dynamic  gs_debug adjustments.
+ * Now tells the rest of the system the number of ports.
+ *
+ * Revision 1.11  1999/04/24 11:11:30  wolff
+ * Fixed two stupid typos in the memory test.
+ *
+ * Revision 1.10  1999/04/24 10:53:39  wolff
+ * Added some of Christian's suggestions.
+ * Fixed an HW_COOK_IN bug (ISIG was not in I_OTHER. We used to trust the
+ * card to send the signal to the process.....)
+ *
+ * Revision 1.9  1999/04/23 07:26:38  wolff
+ * Included Christian Lademann's 2.0 compile-warning fixes and interrupt
+ *    assignment redesign.
+ * Cleanup of some other stuff.
+ *
+ * Revision 1.8  1999/04/16 13:05:30  wolff
+ * fixed a DCD change unnoticed bug.
+ *
+ * Revision 1.7  1999/04/14 22:19:51  wolff
+ * Fixed typo that showed up in 2.0.x builds (get_user instead of Get_user!)
+ *
+ * Revision 1.6  1999/04/13 18:40:20  wolff
+ * changed misc-minor to 161, as assigned by HPA.
+ *
+ * Revision 1.5  1999/04/13 15:12:25  wolff
+ * Fixed use-count leak when "hangup" occurred.
+ * Added workaround for a stupid-PCIBIOS bug.
+ *
+ *
+ * Revision 1.4  1999/04/01 22:47:40  wolff
+ * Fixed < 1M linux-2.0 problem.
+ * (vremap isn't compatible with ioremap in that case)
+ *
+ * Revision 1.3  1999/03/31 13:45:45  wolff
+ * Firmware loading is now done through a separate IOCTL.
+ *
+ * Revision 1.2  1999/03/28 12:22:29  wolff
+ * rcs cleanup
+ *
+ * Revision 1.1  1999/03/28 12:10:34  wolff
+ * Readying for release on 2.0.x (sorry David, 1.01 becomes 1.1 for RCS). 
+ *
+ * Revision 0.12  1999/03/28 09:20:10  wolff
+ * Fixed problem in 0.11, continueing cleanup.
+ *
+ * Revision 0.11  1999/03/28 08:46:44  wolff
+ * cleanup. Not good.
+ *
+ * Revision 0.10  1999/03/28 08:09:43  wolff
+ * Fixed loosing characters on close.
+ *
+ * Revision 0.9  1999/03/21 22:52:01  wolff
+ * Ported back to 2.2.... (minor things)
+ *
+ * Revision 0.8  1999/03/21 22:40:33  wolff
+ * Port to 2.0
+ *
+ * Revision 0.7  1999/03/21 19:06:34  wolff
+ * Fixed hangup processing.
+ *
+ * Revision 0.6  1999/02/05 08:45:14  wolff
+ * fixed real_raw problems. Inclusion into kernel imminent.
+ *
+ * Revision 0.5  1998/12/21 23:51:06  wolff
+ * Snatched a nasty bug: sx_transmit_chars was getting re-entered, and it
+ * shouldn't have. THATs why I want to have transmit interrupts even when
+ * the buffer is empty.
+ *
+ * Revision 0.4  1998/12/17 09:34:46  wolff
+ * PPP works. ioctl works. Basically works!
+ *
+ * Revision 0.3  1998/12/15 13:05:18  wolff
+ * It works! Wow! Gotta start implementing IOCTL and stuff....
+ *
+ * Revision 0.2  1998/12/01 08:33:53  wolff
+ * moved over to 2.1.130
+ *
+ * Revision 0.1  1998/11/03 21:23:51  wolff
+ * Initial revision. Detects SX card.
+ *
+ * */
+
+
+#define RCS_ID "$Id: sx.c,v 1.33 2000/03/08 10:01:02 wolff, pvdl Exp $"
+#define RCS_REV "$Revision: 1.33 $"
+
+
+#include <linux/module.h>
+#include <linux/config.h> 
+#include <linux/kdev_t.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/tty_flip.h>
+#include <linux/mm.h>
+#include <linux/serial.h>
+#include <linux/fcntl.h>
+#include <linux/major.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/bitops.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+/* The 3.0.0 version of sxboards/sxwindow.h  uses BYTE and WORD.... */
+#define BYTE u8
+#define WORD u16
+
+/* .... but the 3.0.4 version uses _u8 and _u16. */
+#define _u8 u8
+#define _u16 u16
+
+#include "sxboards.h"
+#include "sxwindow.h"
+
+#include <linux/generic_serial.h>
+#include "sx.h"
+
+
+/* I don't think that this driver can handle more than 256 ports on
+   one machine. You'll have to increase the number of boards in sx.h
+   if you want more than 4 boards.  */
+
+#ifndef PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8
+#define PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8 0x2000
+#endif
+
+#ifdef CONFIG_PCI
+static struct pci_device_id sx_pci_tbl[] = {
+	{ PCI_VENDOR_ID_SPECIALIX, PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8, PCI_ANY_ID, PCI_ANY_ID },
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(pci, sx_pci_tbl);
+#endif /* CONFIG_PCI */
+
+/* Configurable options: 
+   (Don't be too sure that it'll work if you toggle them) */
+
+/* Am I paranoid or not ? ;-) */
+#undef SX_PARANOIA_CHECK
+
+
+/* 20 -> 2000 per second. The card should rate-limit interrupts at 100
+   Hz, but it is user configurable. I don't recommend going above 1000
+   Hz. The interrupt ratelimit might trigger if the interrupt is
+   shared with a very active other device. */
+#define IRQ_RATE_LIMIT 20
+
+/* Sharing interrupts is possible now. If the other device wants more
+   than 2000 interrupts per second, we'd gracefully decline further
+   interrupts. That's not what we want. On the other hand, if the
+   other device interrupts 2000 times a second, don't use the SX
+   interrupt. Use polling. */
+#undef IRQ_RATE_LIMIT
+
+
+#if 0
+/* Not implemented */
+/* 
+ * The following defines are mostly for testing purposes. But if you need
+ * some nice reporting in your syslog, you can define them also.
+ */
+#define SX_REPORT_FIFO
+#define SX_REPORT_OVERRUN
+#endif 
+
+
+/* Function prototypes */
+static void sx_disable_tx_interrupts (void * ptr); 
+static void sx_enable_tx_interrupts (void * ptr); 
+static void sx_disable_rx_interrupts (void * ptr); 
+static void sx_enable_rx_interrupts (void * ptr); 
+static int  sx_get_CD (void * ptr); 
+static void sx_shutdown_port (void * ptr);
+static int  sx_set_real_termios (void  *ptr);
+static void sx_close (void  *ptr);
+static int sx_chars_in_buffer (void * ptr);
+static int sx_init_board (struct sx_board *board);
+static int sx_init_portstructs (int nboards, int nports);
+static int sx_fw_ioctl (struct inode *inode, struct file *filp,
+                        unsigned int cmd, unsigned long arg);
+static int sx_init_drivers(void);
+
+
+static struct tty_driver *sx_driver;
+
+static struct sx_board boards[SX_NBOARDS];
+static struct sx_port *sx_ports;
+static int sx_initialized;
+static int sx_nports;
+static int sx_debug;
+
+
+/* You can have the driver poll your card. 
+    - Set sx_poll to 1 to poll every timer tick (10ms on Intel). 
+      This is used when the card cannot use an interrupt for some reason.
+
+    - set sx_slowpoll to 100 to do an extra poll once a second (on Intel). If 
+      the driver misses an interrupt (report this if it DOES happen to you!)
+      everything will continue to work.... 
+ */
+static int sx_poll = 1;
+static int sx_slowpoll;
+
+/* The card limits the number of interrupts per second. 
+   At 115k2 "100" should be sufficient. 
+   If you're using higher baudrates, you can increase this...
+ */
+
+static int sx_maxints = 100;
+
+/* These are the only open spaces in my computer. Yours may have more
+   or less.... -- REW 
+   duh: Card at 0xa0000 is possible on HP Netserver?? -- pvdl
+*/
+static int sx_probe_addrs[]= {0xc0000, 0xd0000, 0xe0000, 
+                              0xc8000, 0xd8000, 0xe8000};
+static int si_probe_addrs[]= {0xc0000, 0xd0000, 0xe0000, 
+                              0xc8000, 0xd8000, 0xe8000, 0xa0000};
+static int si1_probe_addrs[]= { 0xd0000};
+
+#define NR_SX_ADDRS (sizeof(sx_probe_addrs)/sizeof (int))
+#define NR_SI_ADDRS (sizeof(si_probe_addrs)/sizeof (int))
+#define NR_SI1_ADDRS (sizeof(si1_probe_addrs)/sizeof (int))
+
+
+/* Set the mask to all-ones. This alas, only supports 32 interrupts. 
+   Some architectures may need more. */
+static int sx_irqmask = -1;
+
+module_param_array(sx_probe_addrs, int, NULL, 0);
+module_param_array(si_probe_addrs, int, NULL, 0);
+module_param(sx_poll, int, 0);
+module_param(sx_slowpoll, int, 0);
+module_param(sx_maxints, int, 0);
+module_param(sx_debug, int, 0);
+module_param(sx_irqmask, int, 0);
+
+MODULE_LICENSE("GPL");
+
+static struct real_driver sx_real_driver = {
+	sx_disable_tx_interrupts,
+	sx_enable_tx_interrupts,
+	sx_disable_rx_interrupts,
+	sx_enable_rx_interrupts,
+	sx_get_CD,
+	sx_shutdown_port, 
+	sx_set_real_termios, 
+	sx_chars_in_buffer,
+	sx_close,
+};
+
+
+/* 
+   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
+
+
+#ifdef DEBUG
+#define sx_dprintk(f, str...) if (sx_debug & f) printk (str)
+#else
+#define sx_dprintk(f, str...) /* nothing */
+#endif
+
+
+
+#define func_enter() sx_dprintk (SX_DEBUG_FLOW, "sx: enter %s\n",__FUNCTION__)
+#define func_exit()  sx_dprintk (SX_DEBUG_FLOW, "sx: exit  %s\n", __FUNCTION__)
+
+#define func_enter2() sx_dprintk (SX_DEBUG_FLOW, "sx: enter %s (port %d)\n", \
+					__FUNCTION__, port->line)
+
+
+
+
+/* 
+ *  Firmware loader driver specific routines
+ *
+ */
+
+static struct file_operations sx_fw_fops = {
+	.owner		= THIS_MODULE,
+	.ioctl		= sx_fw_ioctl,
+};
+
+static struct miscdevice sx_fw_device = {
+	SXCTL_MISC_MINOR, "sxctl", &sx_fw_fops
+};
+
+
+
+
+
+#ifdef SX_PARANOIA_CHECK
+
+/* This doesn't work. Who's paranoid around here? Not me! */
+
+static inline int sx_paranoia_check(struct sx_port const * port,
+				    char *name, const char *routine)
+{
+
+	static const char *badmagic =
+	  KERN_ERR "sx: Warning: bad sx port magic number for device %s in %s\n";
+	static const char *badinfo =
+	  KERN_ERR "sx: Warning: null sx port for device %s in %s\n";
+ 
+	if (!port) {
+		printk(badinfo, name, routine);
+		return 1;
+	}
+	if (port->magic != SX_MAGIC) {
+		printk(badmagic, name, routine);
+		return 1;
+	}
+
+	return 0;
+}
+#else
+#define sx_paranoia_check(a,b,c) 0
+#endif
+
+/* The timeouts. First try 30 times as fast as possible. Then give
+   the card some time to breathe between accesses. (Otherwise the
+   processor on the card might not be able to access its OWN bus... */
+
+#define TIMEOUT_1 30
+#define TIMEOUT_2 1000000
+
+
+#ifdef DEBUG
+static void my_hd_io(void __iomem *p, int len)
+{
+	int i, j, ch;
+	unsigned char __iomem *addr = p;
+
+	for (i=0;i<len;i+=16) {
+		printk ("%p ", addr+i);
+		for (j=0;j<16;j++) {
+			printk ("%02x %s", readb(addr+j+i), (j==7)?" ":"");
+		}
+		for (j=0;j<16;j++) {
+			ch = readb(addr+j+i);
+			printk ("%c", (ch < 0x20)?'.':((ch > 0x7f)?'.':ch));
+		}
+		printk ("\n");
+	}
+}
+static void my_hd(void *p, int len)
+{
+	int i, j, ch;
+	unsigned char *addr = p;
+
+	for (i=0;i<len;i+=16) {
+		printk ("%p ", addr+i);
+		for (j=0;j<16;j++) {
+			printk ("%02x %s", addr[j+i], (j==7)?" ":"");
+		}
+		for (j=0;j<16;j++) {
+			ch = addr[j+i];
+			printk ("%c", (ch < 0x20)?'.':((ch > 0x7f)?'.':ch));
+		}
+		printk ("\n");
+	}
+}
+#endif
+
+
+
+/* This needs redoing for Alpha -- REW -- Done. */
+
+static inline void write_sx_byte (struct sx_board *board, int offset, u8 byte)
+{
+	writeb (byte, board->base+offset);
+}
+
+static inline u8 read_sx_byte (struct sx_board *board, int offset)
+{
+	return readb (board->base+offset);
+}
+
+
+static inline void write_sx_word (struct sx_board *board, int offset, u16 word)
+{
+	writew (word, board->base+offset);
+}
+
+static inline u16 read_sx_word (struct sx_board *board, int offset)
+{
+	return readw (board->base + offset);
+}
+
+
+static int sx_busy_wait_eq (struct sx_board *board, 
+                     	    int offset, int mask, int correctval)
+{
+	int i;
+
+	func_enter ();
+
+	for (i=0; i < TIMEOUT_1 ;i++)
+		if ((read_sx_byte (board, offset) & mask) == correctval) {
+			func_exit ();
+			return 1;
+		}
+
+	for (i=0; i < TIMEOUT_2 ;i++) {
+		if ((read_sx_byte (board, offset) & mask) == correctval) {
+			func_exit ();
+			return 1;
+		}
+		udelay (1);
+	}
+
+	func_exit ();
+	return 0;
+}
+
+
+static int sx_busy_wait_neq (struct sx_board *board, 
+                      	     int offset, int mask, int badval)
+{
+	int i;
+
+	func_enter ();
+
+	for (i=0; i < TIMEOUT_1 ;i++)
+		if ((read_sx_byte (board, offset) & mask) != badval) {
+			func_exit ();
+			return 1;
+		}
+
+	for (i=0; i < TIMEOUT_2 ;i++) {
+		if ((read_sx_byte (board, offset) & mask) != badval) {
+			func_exit ();
+			return 1;
+		}
+		udelay (1);
+	}
+
+	func_exit ();
+	return 0;
+}
+
+
+
+/* 5.6.4 of 6210028 r2.3 */
+static int sx_reset (struct sx_board *board)
+{
+	func_enter ();
+
+	if (IS_SX_BOARD (board)) {
+
+		write_sx_byte (board, SX_CONFIG, 0);
+		write_sx_byte (board, SX_RESET, 1); /* Value doesn't matter */
+
+		if (!sx_busy_wait_eq (board, SX_RESET_STATUS, 1, 0)) {
+			printk (KERN_INFO "sx: Card doesn't respond to reset....\n");
+			return 0;
+		}
+	} else if (IS_EISA_BOARD(board)) {
+		outb(board->irq<<4, board->eisa_base+0xc02);
+	} else if (IS_SI1_BOARD(board)) {
+	        write_sx_byte (board, SI1_ISA_RESET,   0); // value does not matter
+	} else {
+		/* Gory details of the SI/ISA board */
+		write_sx_byte (board, SI2_ISA_RESET,    SI2_ISA_RESET_SET);
+		write_sx_byte (board, SI2_ISA_IRQ11,    SI2_ISA_IRQ11_CLEAR);
+		write_sx_byte (board, SI2_ISA_IRQ12,    SI2_ISA_IRQ12_CLEAR);
+		write_sx_byte (board, SI2_ISA_IRQ15,    SI2_ISA_IRQ15_CLEAR);
+		write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_CLEAR);
+		write_sx_byte (board, SI2_ISA_IRQSET,   SI2_ISA_IRQSET_CLEAR);
+	}
+
+	func_exit ();
+	return 1;
+}
+
+
+/* This doesn't work on machines where "NULL" isn't 0 */
+/* If you have one of those, someone will need to write 
+   the equivalent of this, which will amount to about 3 lines. I don't
+   want to complicate this right now. -- REW
+   (See, I do write comments every now and then :-) */
+#define OFFSETOF(strct, elem) ((long)&(((struct strct *)NULL)->elem))
+
+
+#define CHAN_OFFSET(port,elem) (port->ch_base + OFFSETOF (_SXCHANNEL, elem))
+#define MODU_OFFSET(board,addr,elem)    (addr + OFFSETOF (_SXMODULE, elem))
+#define  BRD_OFFSET(board,elem)                (OFFSETOF (_SXCARD, elem))
+
+
+#define sx_write_channel_byte(port, elem, val) \
+   write_sx_byte (port->board, CHAN_OFFSET (port, elem), val)
+
+#define sx_read_channel_byte(port, elem) \
+   read_sx_byte (port->board, CHAN_OFFSET (port, elem))
+
+#define sx_write_channel_word(port, elem, val) \
+   write_sx_word (port->board, CHAN_OFFSET (port, elem), val)
+
+#define sx_read_channel_word(port, elem) \
+   read_sx_word (port->board, CHAN_OFFSET (port, elem))
+
+
+#define sx_write_module_byte(board, addr, elem, val) \
+   write_sx_byte (board, MODU_OFFSET (board, addr, elem), val)
+
+#define sx_read_module_byte(board, addr, elem) \
+   read_sx_byte (board, MODU_OFFSET (board, addr, elem))
+
+#define sx_write_module_word(board, addr, elem, val) \
+   write_sx_word (board, MODU_OFFSET (board, addr, elem), val)
+
+#define sx_read_module_word(board, addr, elem) \
+   read_sx_word (board, MODU_OFFSET (board, addr, elem))
+
+
+#define sx_write_board_byte(board, elem, val) \
+   write_sx_byte (board, BRD_OFFSET (board, elem), val)
+
+#define sx_read_board_byte(board, elem) \
+   read_sx_byte (board, BRD_OFFSET (board, elem))
+
+#define sx_write_board_word(board, elem, val) \
+   write_sx_word (board, BRD_OFFSET (board, elem), val)
+
+#define sx_read_board_word(board, elem) \
+   read_sx_word (board, BRD_OFFSET (board, elem))
+
+
+static int sx_start_board (struct sx_board *board)
+{
+	if (IS_SX_BOARD (board)) {
+		write_sx_byte (board, SX_CONFIG, SX_CONF_BUSEN);
+	} else if (IS_EISA_BOARD(board)) {
+		write_sx_byte(board, SI2_EISA_OFF, SI2_EISA_VAL);
+		outb((board->irq<<4)|4, board->eisa_base+0xc02);
+	} else if (IS_SI1_BOARD(board)) {
+		write_sx_byte (board, SI1_ISA_RESET_CLEAR, 0);
+		write_sx_byte (board, SI1_ISA_INTCL, 0);
+	} else {
+		/* Don't bug me about the clear_set. 
+		   I haven't the foggiest idea what it's about -- REW */
+		write_sx_byte (board, SI2_ISA_RESET,    SI2_ISA_RESET_CLEAR);
+		write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_SET);
+	}
+	return 1;
+}
+
+#define SX_IRQ_REG_VAL(board) \
+        ((board->flags & SX_ISA_BOARD)?(board->irq << 4):0)
+
+/* Note. The SX register is write-only. Therefore, we have to enable the
+   bus too. This is a no-op, if you don't mess with this driver... */
+static int sx_start_interrupts (struct sx_board *board)
+{
+
+	/* Don't call this with board->irq == 0 */
+
+	if (IS_SX_BOARD(board)) {
+		write_sx_byte (board, SX_CONFIG, SX_IRQ_REG_VAL (board) | 
+		                                 SX_CONF_BUSEN | 
+		                                 SX_CONF_HOSTIRQ);
+	} else if (IS_EISA_BOARD(board)) {
+		inb(board->eisa_base+0xc03);  
+	} else if (IS_SI1_BOARD(board)) {
+	       write_sx_byte (board, SI1_ISA_INTCL,0);
+	       write_sx_byte (board, SI1_ISA_INTCL_CLEAR,0);
+	} else {
+		switch (board->irq) {
+		case 11:write_sx_byte (board, SI2_ISA_IRQ11, SI2_ISA_IRQ11_SET);break;
+		case 12:write_sx_byte (board, SI2_ISA_IRQ12, SI2_ISA_IRQ12_SET);break;
+		case 15:write_sx_byte (board, SI2_ISA_IRQ15, SI2_ISA_IRQ15_SET);break;
+		default:printk (KERN_INFO "sx: SI/XIO card doesn't support interrupt %d.\n", 
+		                board->irq);
+		return 0;
+		}
+		write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_SET);
+	}
+
+	return 1;
+}
+
+
+static int sx_send_command (struct sx_port *port, 
+                     	    int command, int mask, int newstat)
+{
+	func_enter2 ();
+	write_sx_byte (port->board, CHAN_OFFSET (port, hi_hstat), command);
+	func_exit ();
+	return sx_busy_wait_eq (port->board, CHAN_OFFSET (port, hi_hstat), mask, newstat);
+}
+
+
+static char *mod_type_s (int module_type)
+{
+	switch (module_type) {
+	case TA4:       return "TA4";
+	case TA8:       return "TA8";
+	case TA4_ASIC:  return "TA4_ASIC";
+	case TA8_ASIC:  return "TA8_ASIC";
+	case MTA_CD1400:return "MTA_CD1400";
+	case SXDC:      return "SXDC";
+	default:return "Unknown/invalid";
+	}
+}
+
+
+static char *pan_type_s (int pan_type)
+{
+	switch (pan_type) {
+	case MOD_RS232DB25:     return "MOD_RS232DB25";
+	case MOD_RS232RJ45:     return "MOD_RS232RJ45";
+	case MOD_RS422DB25:     return "MOD_RS422DB25";
+	case MOD_PARALLEL:      return "MOD_PARALLEL";
+	case MOD_2_RS232DB25:   return "MOD_2_RS232DB25";
+	case MOD_2_RS232RJ45:   return "MOD_2_RS232RJ45";
+	case MOD_2_RS422DB25:   return "MOD_2_RS422DB25";
+	case MOD_RS232DB25MALE: return "MOD_RS232DB25MALE";
+	case MOD_2_PARALLEL:    return "MOD_2_PARALLEL";
+	case MOD_BLANK:         return "empty";
+	default:return "invalid";
+	}
+}
+
+
+static int mod_compat_type (int module_type)
+{
+	return module_type >> 4;
+}
+
+static void sx_reconfigure_port(struct sx_port *port)
+{
+	if (sx_read_channel_byte (port, hi_hstat) == HS_IDLE_OPEN) {
+		if (sx_send_command (port, HS_CONFIG, -1, HS_IDLE_OPEN) != 1) {
+			printk (KERN_WARNING "sx: Sent reconfigure command, but card didn't react.\n");
+		}
+	} else {
+		sx_dprintk (SX_DEBUG_TERMIOS, 
+		            "sx: Not sending reconfigure: port isn't open (%02x).\n", 
+		            sx_read_channel_byte (port, hi_hstat));
+	}	
+}
+
+static void sx_setsignals (struct sx_port *port, int dtr, int rts)
+{
+	int t;
+	func_enter2 ();
+
+	t = sx_read_channel_byte (port, hi_op);
+	if (dtr >= 0) t = dtr? (t | OP_DTR): (t & ~OP_DTR);
+	if (rts >= 0) t = rts? (t | OP_RTS): (t & ~OP_RTS);
+	sx_write_channel_byte (port, hi_op, t);
+	sx_dprintk (SX_DEBUG_MODEMSIGNALS, "setsignals: %d/%d\n", dtr, rts);
+
+	func_exit ();
+}
+
+
+
+static int sx_getsignals (struct sx_port *port)
+{
+	int i_stat,o_stat;
+
+	o_stat = sx_read_channel_byte (port, hi_op);
+	i_stat = sx_read_channel_byte (port, hi_ip);
+
+	sx_dprintk (SX_DEBUG_MODEMSIGNALS, "getsignals: %d/%d  (%d/%d) %02x/%02x\n",
+	            (o_stat & OP_DTR) != 0, (o_stat & OP_RTS) != 0,
+	            port->c_dcd, sx_get_CD (port),
+	            sx_read_channel_byte (port, hi_ip),
+	            sx_read_channel_byte (port, hi_state));
+
+	return (((o_stat & OP_DTR)?TIOCM_DTR:0) |
+	        ((o_stat & OP_RTS)?TIOCM_RTS:0) |
+	        ((i_stat & IP_CTS)?TIOCM_CTS:0) |
+	        ((i_stat & IP_DCD)?TIOCM_CAR:0) |
+	        ((i_stat & IP_DSR)?TIOCM_DSR:0) |
+	        ((i_stat & IP_RI)?TIOCM_RNG:0)
+	        );
+}
+
+
+static void sx_set_baud (struct sx_port *port)
+{
+	int t;
+
+	if (port->board->ta_type == MOD_SXDC) {
+		switch (port->gs.baud) {
+		  /* Save some typing work... */
+#define e(x) case x:t= BAUD_ ## x ; break
+			e(50);e(75);e(110);e(150);e(200);e(300);e(600);
+                        e(1200);e(1800);e(2000);e(2400);e(4800);e(7200);
+                        e(9600);e(14400);e(19200);e(28800);e(38400);
+                        e(56000);e(57600);e(64000);e(76800);e(115200);
+			e(128000);e(150000);e(230400);e(256000);e(460800);
+                        e(921600);
+		case 134    :t = BAUD_134_5;   break;
+		case 0      :t = -1;
+								 break;
+		default:
+			/* Can I return "invalid"? */
+			t = BAUD_9600;
+			printk (KERN_INFO "sx: unsupported baud rate: %d.\n", port->gs.baud);
+			break;
+		}
+#undef e
+		if (t > 0) {
+			/* The baud rate is not set to 0, so we're enabeling DTR... -- REW */
+			sx_setsignals (port, 1, -1); 
+			/* XXX This is not TA & MTA compatible */
+			sx_write_channel_byte (port, hi_csr, 0xff);
+
+			sx_write_channel_byte (port, hi_txbaud, t);
+			sx_write_channel_byte (port, hi_rxbaud, t);
+		} else {
+			sx_setsignals (port, 0, -1);
+		}
+	} else {
+		switch (port->gs.baud) {
+#define e(x) case x:t= CSR_ ## x ; break
+			e(75);e(150);e(300);e(600);e(1200);e(2400);e(4800);
+                        e(1800);e(9600);
+			e(19200);e(57600);e(38400);
+			/* TA supports 110, but not 115200, MTA supports 115200, but not 110 */
+		case 110: 
+			if (port->board->ta_type == MOD_TA) {
+				t = CSR_110;
+				break;
+			} else {
+				t = CSR_9600;
+				printk (KERN_INFO "sx: Unsupported baud rate: %d.\n", port->gs.baud);
+				break;
+			}
+		case 115200: 
+			if (port->board->ta_type == MOD_TA) {
+				t = CSR_9600;
+				printk (KERN_INFO "sx: Unsupported baud rate: %d.\n", port->gs.baud);
+				break;
+			} else {
+				t = CSR_110;
+				break;
+			}
+		case 0      :t = -1;
+								 break;
+		default:
+			t = CSR_9600;
+			printk (KERN_INFO "sx: Unsupported baud rate: %d.\n", port->gs.baud);
+			break;
+		}
+#undef e
+		if (t >= 0) {
+			sx_setsignals (port, 1, -1);
+			sx_write_channel_byte (port, hi_csr, t * 0x11);
+		} else {
+			sx_setsignals (port, 0, -1);
+		}
+	}
+}
+
+
+/* Simon Allen's version of this routine was 225 lines long. 85 is a lot
+   better. -- REW */
+
+static int sx_set_real_termios (void *ptr)
+{
+	struct sx_port *port = ptr;
+
+	func_enter2();
+
+	if (!port->gs.tty)
+		return 0;
+
+	/* What is this doing here? -- REW
+	   Ha! figured it out. It is to allow you to get DTR active again
+	   if you've dropped it with stty 0. Moved to set_baud, where it
+	   belongs (next to the drop dtr if baud == 0) -- REW */
+	/* sx_setsignals (port, 1, -1); */
+
+	sx_set_baud (port);
+
+#define CFLAG port->gs.tty->termios->c_cflag
+	sx_write_channel_byte (port, hi_mr1,
+	                       (C_PARENB (port->gs.tty)? MR1_WITH:MR1_NONE) |
+	                       (C_PARODD (port->gs.tty)? MR1_ODD:MR1_EVEN) |
+	                       (C_CRTSCTS(port->gs.tty)? MR1_RTS_RXFLOW:0) |
+	                       (((CFLAG & CSIZE)==CS8) ? MR1_8_BITS:0) |
+	                       (((CFLAG & CSIZE)==CS7) ? MR1_7_BITS:0) |
+	                       (((CFLAG & CSIZE)==CS6) ? MR1_6_BITS:0) |
+	                       (((CFLAG & CSIZE)==CS5) ? MR1_5_BITS:0) );
+
+	sx_write_channel_byte (port, hi_mr2,
+	                       (C_CRTSCTS(port->gs.tty)?MR2_CTS_TXFLOW:0) |
+	                       (C_CSTOPB (port->gs.tty)?MR2_2_STOP:MR2_1_STOP));
+
+	switch (CFLAG & CSIZE) {
+	case CS8:sx_write_channel_byte (port, hi_mask, 0xff);break;
+	case CS7:sx_write_channel_byte (port, hi_mask, 0x7f);break;
+	case CS6:sx_write_channel_byte (port, hi_mask, 0x3f);break;
+	case CS5:sx_write_channel_byte (port, hi_mask, 0x1f);break;
+	default:
+		printk (KERN_INFO "sx: Invalid wordsize: %d\n", CFLAG & CSIZE);
+		break;
+	}
+
+	sx_write_channel_byte (port, hi_prtcl, 
+	                       (I_IXON   (port->gs.tty)?SP_TXEN:0) |
+	                       (I_IXOFF  (port->gs.tty)?SP_RXEN:0) |
+	                       (I_IXANY  (port->gs.tty)?SP_TANY:0) |
+	                       SP_DCEN);
+
+	sx_write_channel_byte (port, hi_break, 
+	                       (I_IGNBRK(port->gs.tty)?BR_IGN:0 |
+	                        I_BRKINT(port->gs.tty)?BR_INT:0));
+
+	sx_write_channel_byte (port, hi_txon,  START_CHAR (port->gs.tty));
+	sx_write_channel_byte (port, hi_rxon,  START_CHAR (port->gs.tty));
+	sx_write_channel_byte (port, hi_txoff, STOP_CHAR  (port->gs.tty));
+	sx_write_channel_byte (port, hi_rxoff, STOP_CHAR  (port->gs.tty));
+
+	sx_reconfigure_port(port);
+
+	/* Tell line discipline whether we will do input cooking */
+	if(I_OTHER(port->gs.tty)) {
+		clear_bit(TTY_HW_COOK_IN, &port->gs.tty->flags);
+	} else {
+		set_bit(TTY_HW_COOK_IN, &port->gs.tty->flags);
+	}
+	sx_dprintk (SX_DEBUG_TERMIOS, "iflags: %x(%d) ", 
+	            port->gs.tty->termios->c_iflag, 
+	            I_OTHER(port->gs.tty));
+
+
+/* Tell line discipline whether we will do output cooking.
+ * If OPOST is set and no other output flags are set then we can do output
+ * processing.  Even if only *one* other flag in the O_OTHER group is set
+ * we do cooking in software.
+ */
+	if(O_OPOST(port->gs.tty) && !O_OTHER(port->gs.tty)) {
+		set_bit(TTY_HW_COOK_OUT, &port->gs.tty->flags);
+	} else {
+		clear_bit(TTY_HW_COOK_OUT, &port->gs.tty->flags);
+	}
+	sx_dprintk (SX_DEBUG_TERMIOS, "oflags: %x(%d)\n", 
+	            port->gs.tty->termios->c_oflag, 
+	            O_OTHER(port->gs.tty));
+	/* port->c_dcd = sx_get_CD (port); */
+	func_exit ();
+	return 0;
+}
+
+
+
+/* ********************************************************************** *
+ *                   the interrupt related routines                       *
+ * ********************************************************************** */
+
+/* Note:
+   Other drivers use the macro "MIN" to calculate how much to copy.
+   This has the disadvantage that it will evaluate parts twice. That's
+   expensive when it's IO (and the compiler cannot optimize those away!).
+   Moreover, I'm not sure that you're race-free. 
+
+   I assign a value, and then only allow the value to decrease. This
+   is always safe. This makes the code a few lines longer, and you
+   know I'm dead against that, but I think it is required in this
+   case.  */
+
+
+static void sx_transmit_chars (struct sx_port *port)
+{
+	int c;
+	int tx_ip;
+	int txroom;
+
+	func_enter2 ();
+	sx_dprintk (SX_DEBUG_TRANSMIT, "Port %p: transmit %d chars\n", 
+	            port, port->gs.xmit_cnt);
+
+	if (test_and_set_bit (SX_PORT_TRANSMIT_LOCK, &port->locks)) {
+		return;
+	}
+
+	while (1) {
+		c = port->gs.xmit_cnt;
+
+		sx_dprintk (SX_DEBUG_TRANSMIT, "Copying %d ", c);
+		tx_ip  = sx_read_channel_byte (port, hi_txipos);
+
+		/* Took me 5 minutes to deduce this formula. 
+		   Luckily it is literally in the manual in section 6.5.4.3.5 */
+		txroom = (sx_read_channel_byte (port, hi_txopos) - tx_ip - 1) & 0xff;
+
+		/* Don't copy more bytes than there is room for in the buffer */
+		if (c > txroom)
+			c = txroom;
+		sx_dprintk (SX_DEBUG_TRANSMIT, " %d(%d) ", c, txroom );
+
+		/* Don't copy past the end of the hardware transmit buffer */
+		if (c > 0x100 - tx_ip) 
+			c = 0x100 - tx_ip;
+
+		sx_dprintk (SX_DEBUG_TRANSMIT, " %d(%d) ", c, 0x100-tx_ip );
+
+		/* Don't copy pas the end of the source buffer */
+		if (c > SERIAL_XMIT_SIZE - port->gs.xmit_tail) 
+			c = SERIAL_XMIT_SIZE - port->gs.xmit_tail;
+
+		sx_dprintk (SX_DEBUG_TRANSMIT, " %d(%ld) \n", 
+		            c, SERIAL_XMIT_SIZE- port->gs.xmit_tail);
+
+		/* If for one reason or another, we can't copy more data, we're done! */
+		if (c == 0) break;
+
+
+		memcpy_toio (port->board->base + CHAN_OFFSET(port,hi_txbuf) + tx_ip, 
+		             port->gs.xmit_buf + port->gs.xmit_tail, c);
+
+		/* Update the pointer in the card */
+		sx_write_channel_byte (port, hi_txipos, (tx_ip+c) & 0xff);
+
+		/* Update the kernel buffer end */
+		port->gs.xmit_tail = (port->gs.xmit_tail + c) & (SERIAL_XMIT_SIZE-1);
+
+		/* This one last. (this is essential)
+		   It would allow others to start putting more data into the buffer! */
+		port->gs.xmit_cnt -= c;
+	}
+
+	if (port->gs.xmit_cnt == 0) {
+		sx_disable_tx_interrupts (port);
+	}
+
+	if ((port->gs.xmit_cnt <= port->gs.wakeup_chars) && port->gs.tty) {
+		tty_wakeup(port->gs.tty);
+		sx_dprintk (SX_DEBUG_TRANSMIT, "Waking up.... ldisc (%d)....\n",
+		            port->gs.wakeup_chars); 
+	}
+
+	clear_bit (SX_PORT_TRANSMIT_LOCK, &port->locks);
+	func_exit ();
+}
+
+
+/* Note the symmetry between receiving chars and transmitting them!
+   Note: The kernel should have implemented both a receive buffer and
+   a transmit buffer. */
+
+/* Inlined: Called only once. Remove the inline when you add another call */
+static inline void sx_receive_chars (struct sx_port *port)
+{
+	int c;
+	int rx_op;
+	struct tty_struct *tty;
+	int copied=0;
+
+	func_enter2 ();
+	tty = port->gs.tty;
+	while (1) {
+		rx_op = sx_read_channel_byte (port, hi_rxopos);
+		c = (sx_read_channel_byte (port, hi_rxipos) - rx_op) & 0xff;
+
+		sx_dprintk (SX_DEBUG_RECEIVE, "rxop=%d, c = %d.\n", rx_op, c); 
+
+		/* Don't copy more bytes than there is room for in the buffer */
+		if (tty->flip.count + c > TTY_FLIPBUF_SIZE) 
+			c = TTY_FLIPBUF_SIZE - tty->flip.count;
+
+		sx_dprintk (SX_DEBUG_RECEIVE, "c = %d.\n", c); 
+
+		/* Don't copy past the end of the hardware receive buffer */
+		if (rx_op + c > 0x100) c = 0x100 - rx_op;
+
+		sx_dprintk (SX_DEBUG_RECEIVE, "c = %d.\n", c);
+
+		/* If for one reason or another, we can't copy more data, we're done! */
+		if (c == 0) break;
+
+		sx_dprintk (SX_DEBUG_RECEIVE , "Copying over %d chars. First is %d at %lx\n", c, 
+		            read_sx_byte (port->board, CHAN_OFFSET(port,hi_rxbuf) + rx_op),
+		            CHAN_OFFSET(port, hi_rxbuf)); 
+		memcpy_fromio (tty->flip.char_buf_ptr, 
+		               port->board->base + CHAN_OFFSET(port,hi_rxbuf) + rx_op, c);
+		memset(tty->flip.flag_buf_ptr, TTY_NORMAL, c);
+
+		/* Update the kernel buffer end */
+		tty->flip.count += c;
+		tty->flip.char_buf_ptr += c;
+		tty->flip.flag_buf_ptr += c;
+
+		/* This one last. ( Not essential.)
+		   It allows the card to start putting more data into the buffer! 
+		   Update the pointer in the card */
+		sx_write_channel_byte (port, hi_rxopos, (rx_op + c) & 0xff);
+
+		copied += c;
+	}
+	if (copied) {
+		struct timeval tv;
+
+		do_gettimeofday (&tv);
+		sx_dprintk (SX_DEBUG_RECEIVE, 
+		            "pushing flipq port %d (%3d chars): %d.%06d  (%d/%d)\n", 
+		            port->line, copied, 
+		            (int) (tv.tv_sec % 60), (int)tv.tv_usec, tty->raw, tty->real_raw);
+
+		/* Tell the rest of the system the news. Great news. New characters! */
+		tty_flip_buffer_push (tty);
+		/*    tty_schedule_flip (tty); */
+	}
+
+	func_exit ();
+}
+
+/* Inlined: it is called only once. Remove the inline if you add another 
+   call */
+static inline void sx_check_modem_signals (struct sx_port *port)
+{
+	int hi_state;
+	int c_dcd;
+
+	hi_state = sx_read_channel_byte (port, hi_state);
+	sx_dprintk (SX_DEBUG_MODEMSIGNALS, "Checking modem signals (%d/%d)\n",
+	            port->c_dcd, sx_get_CD (port));
+
+	if (hi_state & ST_BREAK) {
+		hi_state &= ~ST_BREAK;
+		sx_dprintk (SX_DEBUG_MODEMSIGNALS, "got a break.\n");
+		sx_write_channel_byte (port, hi_state, hi_state);
+		gs_got_break (&port->gs);
+	}
+	if (hi_state & ST_DCD) {
+		hi_state &= ~ST_DCD;
+		sx_dprintk (SX_DEBUG_MODEMSIGNALS, "got a DCD change.\n");
+		sx_write_channel_byte (port, hi_state, hi_state);
+		c_dcd = sx_get_CD (port);
+		sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD is now %d\n", c_dcd);
+		if (c_dcd != port->c_dcd) {
+			port->c_dcd = c_dcd;
+			if (sx_get_CD (port)) {
+				/* DCD went UP */
+				if ((sx_read_channel_byte(port, hi_hstat) != HS_IDLE_CLOSED) &&
+						!(port->gs.tty->termios->c_cflag & CLOCAL) ) {
+					/* Are we blocking in open?*/
+					sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD active, unblocking open\n");
+					wake_up_interruptible(&port->gs.open_wait);
+				} else {
+					sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD raised. Ignoring.\n");
+				}
+			} else {
+				/* DCD went down! */
+				if (!(port->gs.tty->termios->c_cflag & CLOCAL) ) {
+					sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD dropped. hanging up....\n");
+					tty_hangup (port->gs.tty);
+				} else {
+					sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD dropped. ignoring.\n");
+				}
+			}
+		} else {
+			sx_dprintk (SX_DEBUG_MODEMSIGNALS, "Hmmm. card told us DCD changed, but it didn't.\n");
+		}
+	}
+}
+
+
+/* This is what an interrupt routine should look like. 
+ * Small, elegant, clear.
+ */
+
+static irqreturn_t sx_interrupt (int irq, void *ptr, struct pt_regs *regs)
+{
+	struct sx_board *board = ptr;
+	struct sx_port *port;
+	int i;
+
+	func_enter ();
+	sx_dprintk (SX_DEBUG_FLOW, "sx: enter sx_interrupt (%d/%d)\n", irq, board->irq); 
+
+	/* AAargh! The order in which to do these things is essential and
+	   not trivial. 
+
+	   - Rate limit goes before "recursive". Otherwise a series of
+	     recursive calls will hang the machine in the interrupt routine. 
+
+	   - hardware twiddling goes before "recursive". Otherwise when we
+	     poll the card, and a recursive interrupt happens, we won't
+	     ack the card, so it might keep on interrupting us. (especially
+	     level sensitive interrupt systems like PCI).
+
+	   - Rate limit goes before hardware twiddling. Otherwise we won't
+	     catch a card that has gone bonkers.
+
+	   - The "initialized" test goes after the hardware twiddling. Otherwise
+	     the card will stick us in the interrupt routine again.
+
+	   - The initialized test goes before recursive. 
+	*/
+
+
+
+#ifdef IRQ_RATE_LIMIT
+	/* Aaargh! I'm ashamed. This costs more lines-of-code than the
+	   actual interrupt routine!. (Well, used to when I wrote that comment) */
+	{
+		static int lastjif;
+		static int nintr=0;
+
+		if (lastjif == jiffies) {
+			if (++nintr > IRQ_RATE_LIMIT) {
+				free_irq (board->irq, board);
+				printk (KERN_ERR "sx: Too many interrupts. Turning off interrupt %d.\n", 
+					      board->irq);
+			}
+		} else {
+			lastjif = jiffies;
+			nintr = 0;
+		}
+	}
+#endif
+
+
+	if (board->irq == irq) {
+		/* Tell the card we've noticed the interrupt. */
+
+		sx_write_board_word (board, cc_int_pending, 0);
+		if (IS_SX_BOARD (board)) {
+			write_sx_byte (board, SX_RESET_IRQ, 1);
+		} else if (IS_EISA_BOARD(board)) {
+			inb(board->eisa_base+0xc03);
+			write_sx_word(board, 8, 0); 
+		} else {
+			write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_CLEAR);
+			write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_SET);
+		}
+	}
+
+	if (!sx_initialized)
+		return IRQ_HANDLED;
+	if (!(board->flags & SX_BOARD_INITIALIZED))
+		return IRQ_HANDLED;
+
+	if (test_and_set_bit (SX_BOARD_INTR_LOCK, &board->locks)) {
+		printk (KERN_ERR "Recursive interrupt! (%d)\n", board->irq);
+		return IRQ_HANDLED;
+	}
+
+	 for (i=0;i<board->nports;i++) {
+		port = &board->ports[i];
+		if (port->gs.flags & GS_ACTIVE) {
+			if (sx_read_channel_byte (port, hi_state)) {
+				sx_dprintk (SX_DEBUG_INTERRUPTS, 
+				            "Port %d: modem signal change?... \n", i);
+				sx_check_modem_signals (port); 
+			}
+			if (port->gs.xmit_cnt) {
+				sx_transmit_chars (port);
+			}
+			if (!(port->gs.flags & SX_RX_THROTTLE)) {
+				sx_receive_chars (port);
+			}
+		}
+	}
+
+	clear_bit (SX_BOARD_INTR_LOCK, &board->locks);
+
+	sx_dprintk (SX_DEBUG_FLOW, "sx: exit sx_interrupt (%d/%d)\n", irq, board->irq); 
+        func_exit ();
+	return IRQ_HANDLED;
+}
+
+
+static void sx_pollfunc (unsigned long data)
+{
+	struct sx_board *board = (struct sx_board *) data;
+
+	func_enter ();
+
+	sx_interrupt (0, board, NULL);
+
+	init_timer(&board->timer);
+
+	board->timer.expires = jiffies + sx_poll;
+	add_timer (&board->timer);
+	func_exit ();
+}
+
+
+
+/* ********************************************************************** *
+ *                Here are the routines that actually                     *
+ *              interface with the generic_serial driver                  *
+ * ********************************************************************** */
+
+/* Ehhm. I don't know how to fiddle with interrupts on the SX card. --REW */
+/* Hmm. Ok I figured it out. You don't.  */
+
+static void sx_disable_tx_interrupts (void * ptr) 
+{
+	struct sx_port *port = ptr; 
+	func_enter2();
+
+	port->gs.flags &= ~GS_TX_INTEN;
+
+	func_exit();
+}
+
+
+static void sx_enable_tx_interrupts (void * ptr) 
+{
+	struct sx_port *port = ptr; 
+	int data_in_buffer;
+	func_enter2();
+
+	/* First transmit the characters that we're supposed to */
+	sx_transmit_chars (port);
+
+	/* The sx card will never interrupt us if we don't fill the buffer
+	   past 25%. So we keep considering interrupts off if that's the case. */
+	data_in_buffer = (sx_read_channel_byte (port, hi_txipos) - 
+	                  sx_read_channel_byte (port, hi_txopos)) & 0xff;
+
+	/* XXX Must be "HIGH_WATER" for SI card according to doc. */
+	if (data_in_buffer < LOW_WATER) 
+		port->gs.flags &= ~GS_TX_INTEN;
+
+	func_exit();
+}
+
+
+static void sx_disable_rx_interrupts (void * ptr) 
+{
+	/*  struct sx_port *port = ptr; */
+	func_enter();
+
+	func_exit();
+}
+
+static void sx_enable_rx_interrupts (void * ptr) 
+{
+	/*  struct sx_port *port = ptr; */
+	func_enter();
+
+	func_exit();
+}
+
+
+/* Jeez. Isn't this simple? */
+static int sx_get_CD (void * ptr) 
+{
+	struct sx_port *port = ptr;
+	func_enter2();
+
+	func_exit();
+	return ((sx_read_channel_byte (port, hi_ip) & IP_DCD) != 0);
+}
+
+
+/* Jeez. Isn't this simple? */
+static int sx_chars_in_buffer (void * ptr) 
+{
+	struct sx_port *port = ptr;
+	func_enter2();
+
+	func_exit();
+	return ((sx_read_channel_byte (port, hi_txipos) - 
+	         sx_read_channel_byte (port, hi_txopos)) & 0xff);
+}
+
+
+static void sx_shutdown_port (void * ptr) 
+{
+	struct sx_port *port = ptr; 
+
+	func_enter();
+
+	port->gs.flags &= ~ GS_ACTIVE;
+	if (port->gs.tty && (port->gs.tty->termios->c_cflag & HUPCL)) {
+		sx_setsignals (port, 0, 0);
+		sx_reconfigure_port(port);
+	}
+
+	func_exit();
+}
+
+
+
+
+
+/* ********************************************************************** *
+ *                Here are the routines that actually                     *
+ *               interface with the rest of the system                    *
+ * ********************************************************************** */
+
+static int sx_open  (struct tty_struct * tty, struct file * filp)
+{
+	struct sx_port *port;
+	int retval, line;
+	unsigned long flags;
+
+	func_enter();
+
+	if (!sx_initialized) {
+		return -EIO;
+	}
+
+	line = tty->index;
+	sx_dprintk (SX_DEBUG_OPEN, "%d: opening line %d. tty=%p ctty=%p, np=%d)\n", 
+	            current->pid, line, tty, current->signal->tty, sx_nports);
+
+	if ((line < 0) || (line >= SX_NPORTS) || (line >= sx_nports))
+		return -ENODEV;
+
+	port = & sx_ports[line];
+	port->c_dcd = 0; /* Make sure that the first interrupt doesn't detect a
+	                    1 -> 0 transition. */
+
+
+	sx_dprintk (SX_DEBUG_OPEN, "port = %p c_dcd = %d\n", port, port->c_dcd);
+
+	spin_lock_irqsave(&port->gs.driver_lock, flags);
+
+	tty->driver_data = port;
+	port->gs.tty = tty;
+	port->gs.count++;
+	spin_unlock_irqrestore(&port->gs.driver_lock, flags);
+
+	sx_dprintk (SX_DEBUG_OPEN, "starting port\n");
+
+	/*
+	 * Start up serial port
+	 */
+	retval = gs_init_port(&port->gs);
+	sx_dprintk (SX_DEBUG_OPEN, "done gs_init\n");
+	if (retval) {
+		port->gs.count--;
+		return retval;
+	}
+
+	port->gs.flags |= GS_ACTIVE;
+	if (port->gs.count <= 1)
+		sx_setsignals (port, 1,1);
+
+#if 0
+	if (sx_debug & SX_DEBUG_OPEN)
+		my_hd (port, sizeof (*port));
+#else
+	if (sx_debug & SX_DEBUG_OPEN)
+		my_hd_io (port->board->base + port->ch_base, sizeof (*port));
+#endif
+
+	if (port->gs.count <= 1) {
+		if (sx_send_command (port, HS_LOPEN, -1, HS_IDLE_OPEN) != 1) {
+			printk (KERN_ERR "sx: Card didn't respond to LOPEN command.\n");
+			spin_lock_irqsave(&port->gs.driver_lock, flags);
+			port->gs.count--;
+			spin_unlock_irqrestore(&port->gs.driver_lock, flags);
+			return -EIO;
+		}
+	}
+
+	retval = gs_block_til_ready(port, filp);
+	sx_dprintk (SX_DEBUG_OPEN, "Block til ready returned %d. Count=%d\n", 
+	            retval, port->gs.count);
+
+	if (retval) {
+		/* 
+		 * Don't lower gs.count here because sx_close() will be called later
+		 */ 
+
+		return retval;
+	}
+	/* tty->low_latency = 1; */
+
+	port->c_dcd = sx_get_CD (port);
+	sx_dprintk (SX_DEBUG_OPEN, "at open: cd=%d\n", port->c_dcd);
+
+	func_exit();
+	return 0;
+
+}
+
+
+static void sx_close (void *ptr)
+{
+	struct sx_port *port = ptr; 
+	/* Give the port 5 seconds to close down. */
+	int to = 5 * HZ; 
+
+	func_enter ();
+
+	sx_setsignals (port, 0, 0);
+	sx_reconfigure_port(port);	
+	sx_send_command (port, HS_CLOSE, 0, 0);
+
+	while (to-- && (sx_read_channel_byte (port, hi_hstat) != HS_IDLE_CLOSED))
+		if (msleep_interruptible(10))
+			break;
+	if (sx_read_channel_byte (port, hi_hstat) != HS_IDLE_CLOSED) {
+		if (sx_send_command (port, HS_FORCE_CLOSED, -1, HS_IDLE_CLOSED) != 1) {
+			printk (KERN_ERR 
+			        "sx: sent the force_close command, but card didn't react\n");
+		} else
+			sx_dprintk (SX_DEBUG_CLOSE, "sent the force_close command.\n");
+	}
+
+	sx_dprintk (SX_DEBUG_CLOSE, "waited %d jiffies for close. count=%d\n", 
+	            5 * HZ - to - 1, port->gs.count);
+
+	if(port->gs.count) {
+		sx_dprintk(SX_DEBUG_CLOSE, "WARNING port count:%d\n", port->gs.count);
+		//printk ("%s SETTING port count to zero: %p count: %d\n", __FUNCTION__, port, port->gs.count);
+		//port->gs.count = 0;
+	}
+
+	func_exit ();
+}
+
+
+
+/* This is relatively thorough. But then again it is only 20 lines. */
+#define MARCHUP    for (i=min;i<max;i++) 
+#define MARCHDOWN  for (i=max-1;i>=min;i--)
+#define W0         write_sx_byte (board, i, 0x55)
+#define W1         write_sx_byte (board, i, 0xaa)
+#define R0         if (read_sx_byte (board, i) != 0x55) return 1
+#define R1         if (read_sx_byte (board, i) != 0xaa) return 1
+
+/* This memtest takes a human-noticable time. You normally only do it
+   once a boot, so I guess that it is worth it. */
+static int do_memtest (struct sx_board *board, int min, int max)
+{
+	int i;
+
+	/* This is a marchb. Theoretically, marchb catches much more than
+	   simpler tests. In practise, the longer test just catches more
+	   intermittent errors. -- REW
+	   (For the theory behind memory testing see: 
+	   Testing Semiconductor Memories by A.J. van de Goor.) */
+	MARCHUP	 {W0;}
+	MARCHUP   {R0;W1;R1;W0;R0;W1;}
+	MARCHUP   {R1;W0;W1;}
+	MARCHDOWN {R1;W0;W1;W0;}
+	MARCHDOWN {R0;W1;W0;}
+
+	return 0;
+}
+
+
+#undef MARCHUP
+#undef MARCHDOWN
+#undef W0
+#undef W1
+#undef R0
+#undef R1
+
+#define MARCHUP    for (i=min;i<max;i+=2) 
+#define MARCHDOWN  for (i=max-1;i>=min;i-=2)
+#define W0         write_sx_word (board, i, 0x55aa)
+#define W1         write_sx_word (board, i, 0xaa55)
+#define R0         if (read_sx_word (board, i) != 0x55aa) return 1
+#define R1         if (read_sx_word (board, i) != 0xaa55) return 1
+
+#if 0
+/* This memtest takes a human-noticable time. You normally only do it
+   once a boot, so I guess that it is worth it. */
+static int do_memtest_w (struct sx_board *board, int min, int max)
+{
+	int i;
+
+	MARCHUP   {W0;}
+	MARCHUP   {R0;W1;R1;W0;R0;W1;}
+	MARCHUP   {R1;W0;W1;}
+	MARCHDOWN {R1;W0;W1;W0;}
+	MARCHDOWN {R0;W1;W0;}
+
+	return 0;
+}
+#endif
+
+
+static int sx_fw_ioctl (struct inode *inode, struct file *filp,
+                        unsigned int cmd, unsigned long arg)
+{
+	int rc = 0;
+	int __user *descr = (int __user *)arg;
+	int i;
+	static struct sx_board *board = NULL;
+	int nbytes, offset;
+	unsigned long data;
+	char *tmp;
+
+	func_enter();
+
+#if 0 
+	/* Removed superuser check: Sysops can use the permissions on the device
+	   file to restrict access. Recommendation: Root only. (root.root 600) */
+	if (!capable(CAP_SYS_ADMIN)) {
+		return -EPERM;
+	}
+#endif
+
+	sx_dprintk (SX_DEBUG_FIRMWARE, "IOCTL %x: %lx\n", cmd, arg);
+
+	if (!board) board = &boards[0];
+	if (board->flags & SX_BOARD_PRESENT) {
+		sx_dprintk (SX_DEBUG_FIRMWARE, "Board present! (%x)\n", 
+		            board->flags);
+	} else {
+		sx_dprintk (SX_DEBUG_FIRMWARE, "Board not present! (%x) all:", 
+		            board->flags);
+		for (i=0;i< SX_NBOARDS;i++)
+			sx_dprintk (SX_DEBUG_FIRMWARE, "<%x> ", boards[i].flags);
+		sx_dprintk (SX_DEBUG_FIRMWARE, "\n");
+		return -EIO;
+	}
+
+	switch (cmd) {
+	case SXIO_SET_BOARD:
+		sx_dprintk (SX_DEBUG_FIRMWARE, "set board to %ld\n", arg);
+		if (arg >= SX_NBOARDS) return -EIO;
+		sx_dprintk (SX_DEBUG_FIRMWARE, "not out of range\n");
+		if (!(boards[arg].flags	& SX_BOARD_PRESENT)) return -EIO;
+		sx_dprintk (SX_DEBUG_FIRMWARE, ".. and present!\n");
+		board = &boards[arg];
+		break;
+	case SXIO_GET_TYPE:
+		rc = -ENOENT; /* If we manage to miss one, return error. */
+		if (IS_SX_BOARD (board)) rc = SX_TYPE_SX;
+		if (IS_CF_BOARD (board)) rc = SX_TYPE_CF;
+		if (IS_SI_BOARD (board)) rc = SX_TYPE_SI;
+		if (IS_SI1_BOARD (board)) rc = SX_TYPE_SI;
+		if (IS_EISA_BOARD (board)) rc = SX_TYPE_SI;
+		sx_dprintk (SX_DEBUG_FIRMWARE, "returning type= %d\n", rc);
+		break;
+	case SXIO_DO_RAMTEST:
+		if (sx_initialized) /* Already initialized: better not ramtest the board.  */
+			return -EPERM;
+		if (IS_SX_BOARD (board)) {
+			rc          = do_memtest   (board, 0, 0x7000);
+			if (!rc) rc = do_memtest   (board, 0, 0x7000);
+			/*if (!rc) rc = do_memtest_w (board, 0, 0x7000);*/
+		} else {
+			rc             = do_memtest   (board, 0, 0x7ff8);
+			/* if (!rc) rc = do_memtest_w (board, 0, 0x7ff8); */
+		}
+		sx_dprintk (SX_DEBUG_FIRMWARE, "returning memtest result= %d\n", rc);
+		break;
+	case SXIO_DOWNLOAD:
+		if (sx_initialized) /* Already initialized */
+			return -EEXIST;
+		if (!sx_reset (board)) 
+			return -EIO;
+		sx_dprintk (SX_DEBUG_INIT, "reset the board...\n");
+
+		tmp = kmalloc (SX_CHUNK_SIZE, GFP_USER);
+		if (!tmp) return -ENOMEM;
+		get_user (nbytes, descr++);
+		get_user (offset, descr++); 
+		get_user (data,	 descr++);
+		while (nbytes && data) {
+			for (i=0;i<nbytes;i += SX_CHUNK_SIZE) {
+				if (copy_from_user(tmp, (char __user *)data+i, 
+						   (i + SX_CHUNK_SIZE >
+						    nbytes) ? nbytes - i :
+						   	      SX_CHUNK_SIZE)) {
+					kfree (tmp);
+					return -EFAULT;
+				}
+				memcpy_toio(board->base2 + offset + i, tmp, 
+				                (i+SX_CHUNK_SIZE>nbytes)?nbytes-i:SX_CHUNK_SIZE);
+			}
+
+			get_user (nbytes, descr++);
+			get_user (offset, descr++); 
+			get_user (data,   descr++);
+		}
+		kfree (tmp);
+		sx_nports += sx_init_board (board);
+		rc = sx_nports;
+		break;
+	case SXIO_INIT:
+		if (sx_initialized) /* Already initialized */
+			return -EEXIST;
+		/* This is not allowed until all boards are initialized... */
+		for (i=0;i<SX_NBOARDS;i++) {
+			if ( (boards[i].flags & SX_BOARD_PRESENT) &&
+			     !(boards[i].flags & SX_BOARD_INITIALIZED))
+				return -EIO;
+		}
+		for (i=0;i<SX_NBOARDS;i++)
+			if (!(boards[i].flags & SX_BOARD_PRESENT)) break;
+
+		sx_dprintk (SX_DEBUG_FIRMWARE, "initing portstructs, %d boards, "
+		            "%d channels, first board: %d ports\n", 
+		            i, sx_nports, boards[0].nports);
+		rc = sx_init_portstructs (i, sx_nports);
+		sx_init_drivers ();
+		if (rc >= 0) 
+			sx_initialized++;
+		break;
+	case SXIO_SETDEBUG:
+		sx_debug = arg;
+		break;
+	case SXIO_GETDEBUG:
+		rc = sx_debug;
+		break;
+	case SXIO_GETGSDEBUG:
+	case SXIO_SETGSDEBUG:
+		rc = -EINVAL;
+		break;
+	case SXIO_GETNPORTS:
+		rc = sx_nports;
+		break;
+	default:
+		printk (KERN_WARNING "Unknown ioctl on firmware device (%x).\n", cmd);
+		break;
+	}
+	func_exit ();
+	return rc;
+}
+
+
+static void sx_break (struct tty_struct * tty, int flag)
+{
+	struct sx_port *port = tty->driver_data;
+	int rv;
+
+	func_enter ();
+
+	if (flag) 
+		rv = sx_send_command (port, HS_START, -1, HS_IDLE_BREAK);
+	else 
+		rv = sx_send_command (port, HS_STOP, -1, HS_IDLE_OPEN);
+	if (rv != 1) printk (KERN_ERR "sx: couldn't send break (%x).\n",
+			read_sx_byte (port->board, CHAN_OFFSET (port, hi_hstat)));
+
+	func_exit ();
+}
+
+
+static int sx_tiocmget(struct tty_struct *tty, struct file *file)
+{
+	struct sx_port *port = tty->driver_data;
+	return sx_getsignals(port);
+}
+
+static int sx_tiocmset(struct tty_struct *tty, struct file *file,
+		       unsigned int set, unsigned int clear)
+{
+	struct sx_port *port = tty->driver_data;
+	int rts = -1, dtr = -1;
+
+	if (set & TIOCM_RTS)
+		rts = 1;
+	if (set & TIOCM_DTR)
+		dtr = 1;
+	if (clear & TIOCM_RTS)
+		rts = 0;
+	if (clear & TIOCM_DTR)
+		dtr = 0;
+
+	sx_setsignals(port, dtr, rts);
+	sx_reconfigure_port(port);
+	return 0;
+}
+
+static int sx_ioctl (struct tty_struct * tty, struct file * filp, 
+                     unsigned int cmd, unsigned long arg)
+{
+	int rc;
+	struct sx_port *port = tty->driver_data;
+	void __user *argp = (void __user *)arg;
+	int ival;
+
+	/* func_enter2(); */
+
+	rc = 0;
+	switch (cmd) {
+	case TIOCGSOFTCAR:
+		rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
+		              (unsigned __user *) argp);
+		break;
+	case TIOCSSOFTCAR:
+		if ((rc = get_user(ival, (unsigned __user *) argp)) == 0) {
+			tty->termios->c_cflag =
+				(tty->termios->c_cflag & ~CLOCAL) |
+				(ival ? CLOCAL : 0);
+		}
+		break;
+	case TIOCGSERIAL:
+		rc = gs_getserial(&port->gs, argp);
+		break;
+	case TIOCSSERIAL:
+		rc = gs_setserial(&port->gs, argp);
+		break;
+	default:
+		rc = -ENOIOCTLCMD;
+		break;
+	}
+
+	/* func_exit(); */
+	return rc;
+}
+
+
+/* The throttle/unthrottle scheme for the Specialix card is different
+ * from other drivers and deserves some explanation. 
+ * The Specialix hardware takes care of XON/XOFF
+ * and CTS/RTS flow control itself.  This means that all we have to
+ * do when signalled by the upper tty layer to throttle/unthrottle is
+ * to make a note of it here.  When we come to read characters from the
+ * rx buffers on the card (sx_receive_chars()) we look to see if the
+ * upper layer can accept more (as noted here in sx_rx_throt[]). 
+ * If it can't we simply don't remove chars from the cards buffer. 
+ * When the tty layer can accept chars, we again note that here and when
+ * sx_receive_chars() is called it will remove them from the cards buffer.
+ * The card will notice that a ports buffer has drained below some low
+ * water mark and will unflow control the line itself, using whatever
+ * flow control scheme is in use for that port. -- Simon Allen
+ */
+
+static void sx_throttle (struct tty_struct * tty)
+{
+	struct sx_port *port = (struct sx_port *)tty->driver_data;
+
+	func_enter2();
+	/* If the port is using any type of input flow
+	 * control then throttle the port.
+	 */
+	if((tty->termios->c_cflag & CRTSCTS) || (I_IXOFF(tty)) ) {
+		port->gs.flags |= SX_RX_THROTTLE;
+	}
+	func_exit();
+}
+
+
+static void sx_unthrottle (struct tty_struct * tty)
+{
+	struct sx_port *port = (struct sx_port *)tty->driver_data;
+
+	func_enter2();
+	/* Always unthrottle even if flow control is not enabled on
+	 * this port in case we disabled flow control while the port
+	 * was throttled
+	 */
+	port->gs.flags &= ~SX_RX_THROTTLE;
+	func_exit();
+	return;
+}
+
+
+/* ********************************************************************** *
+ *                    Here are the initialization routines.               *
+ * ********************************************************************** */
+
+
+
+
+static int sx_init_board (struct sx_board *board)
+{
+	int addr;
+	int chans;
+	int type;
+
+	func_enter();
+
+	/* This is preceded by downloading the download code. */
+
+	board->flags |= SX_BOARD_INITIALIZED;
+
+	if (read_sx_byte (board, 0))
+		/* CF boards may need this. */
+		write_sx_byte(board,0, 0);
+
+	/* This resets the processor again, to make sure it didn't do any
+	   foolish things while we were downloading the image */
+	if (!sx_reset (board))
+		return 0;
+
+	sx_start_board (board);
+	udelay (10);
+	if (!sx_busy_wait_neq (board, 0, 0xff, 0)) {
+		printk (KERN_ERR "sx: Ooops. Board won't initialize.\n");
+		return 0;
+	}
+
+	/* Ok. So now the processor on the card is running. It gathered
+	   some info for us... */
+	sx_dprintk (SX_DEBUG_INIT, "The sxcard structure:\n");
+	if (sx_debug & SX_DEBUG_INIT) my_hd_io (board->base, 0x10);
+	sx_dprintk (SX_DEBUG_INIT, "the first sx_module structure:\n");
+	if (sx_debug & SX_DEBUG_INIT) my_hd_io (board->base + 0x80, 0x30);
+
+	sx_dprintk (SX_DEBUG_INIT, 
+	            "init_status: %x, %dk memory, firmware V%x.%02x,\n", 
+	            read_sx_byte (board, 0), read_sx_byte(board, 1), 
+	            read_sx_byte (board, 5), read_sx_byte(board, 4));
+
+	if (read_sx_byte (board, 0) == 0xff) {
+		printk (KERN_INFO "sx: No modules found. Sorry.\n");
+		board->nports = 0;
+		return 0;
+	}
+
+	chans = 0;
+
+	if (IS_SX_BOARD(board)) {
+		sx_write_board_word (board, cc_int_count, sx_maxints);
+	} else {
+		if (sx_maxints)
+			sx_write_board_word (board, cc_int_count, SI_PROCESSOR_CLOCK/8/sx_maxints);
+	}
+
+	/* grab the first module type... */
+	/*  board->ta_type = mod_compat_type (read_sx_byte (board, 0x80 + 0x08)); */
+	board->ta_type = mod_compat_type (sx_read_module_byte (board, 0x80, mc_chip));
+
+	/* XXX byteorder */
+	for (addr = 0x80;addr != 0;addr = read_sx_word (board, addr) & 0x7fff) {
+		type = sx_read_module_byte (board, addr, mc_chip);
+		sx_dprintk (SX_DEBUG_INIT, "Module at %x: %d channels\n", 
+		            addr, read_sx_byte (board, addr + 2));
+
+		chans += sx_read_module_byte (board, addr, mc_type);
+
+		sx_dprintk (SX_DEBUG_INIT, "module is an %s, which has %s/%s panels\n", 
+		            mod_type_s (type),
+		            pan_type_s (sx_read_module_byte (board, addr, mc_mods) & 0xf),
+		            pan_type_s (sx_read_module_byte (board, addr, mc_mods) >> 4));
+
+		sx_dprintk (SX_DEBUG_INIT, "CD1400 versions: %x/%x, ASIC version: %x\n", 
+		            sx_read_module_byte (board, addr, mc_rev1),
+		            sx_read_module_byte (board, addr, mc_rev2),
+		            sx_read_module_byte (board, addr, mc_mtaasic_rev));
+
+		/* The following combinations are illegal: It should theoretically
+		   work, but timing problems make the bus HANG. */
+
+		if (mod_compat_type (type) != board->ta_type) {
+			printk (KERN_ERR "sx: This is an invalid configuration.\n"
+			        "Don't mix TA/MTA/SXDC on the same hostadapter.\n");
+			chans=0;
+			break;
+		}
+		if ((IS_EISA_BOARD(board) || 
+		     IS_SI_BOARD(board)) && (mod_compat_type(type) == 4)) {
+			printk (KERN_ERR "sx: This is an invalid configuration.\n"
+			        "Don't use SXDCs on an SI/XIO adapter.\n");
+			chans=0;
+			break;
+		}
+#if 0 /* Problem fixed: firmware 3.05 */
+		if (IS_SX_BOARD(board) && (type == TA8)) {
+			/* There are some issues with the firmware and the DCD/RTS
+			   lines. It might work if you tie them together or something.
+			   It might also work if you get a newer sx_firmware.	Therefore
+			   this is just a warning. */
+			printk (KERN_WARNING "sx: The SX host doesn't work too well "
+			        "with the TA8 adapters.\nSpecialix is working on it.\n");
+		}
+#endif
+	}
+
+	if (chans) {
+		/* board->flags |= SX_BOARD_PRESENT; */
+		if(board->irq > 0) {
+			/* fixed irq, probably PCI */
+			if(sx_irqmask & (1 << board->irq)) { /* may we use this irq? */
+				if(request_irq(board->irq, sx_interrupt, SA_SHIRQ | SA_INTERRUPT, "sx", board)) {
+					printk(KERN_ERR "sx: Cannot allocate irq %d.\n", board->irq);
+					board->irq = 0;
+				}
+			} else
+				board->irq = 0;
+		} else if(board->irq < 0 && sx_irqmask) {
+			/* auto-allocate irq */
+			int irqnr;
+			int irqmask = sx_irqmask & (IS_SX_BOARD(board) ? SX_ISA_IRQ_MASK : SI2_ISA_IRQ_MASK);
+			for(irqnr = 15; irqnr > 0; irqnr--)
+				if(irqmask & (1 << irqnr))
+					if(! request_irq(irqnr, sx_interrupt, SA_SHIRQ | SA_INTERRUPT, "sx", board))
+						break;
+			if(! irqnr)
+				printk(KERN_ERR "sx: Cannot allocate IRQ.\n");
+			board->irq = irqnr;
+		} else
+			board->irq = 0;
+
+		if (board->irq) {
+			/* Found a valid interrupt, start up interrupts! */
+			sx_dprintk (SX_DEBUG_INIT, "Using irq %d.\n", board->irq);
+			sx_start_interrupts (board);
+			board->poll = sx_slowpoll;
+			board->flags |= SX_IRQ_ALLOCATED;
+		} else {
+			/* no irq: setup board for polled operation */
+			board->poll = sx_poll;
+			sx_dprintk (SX_DEBUG_INIT, "Using poll-interval %d.\n", board->poll);
+		}
+
+		/* The timer should be initialized anyway: That way we can safely
+			 del_timer it when the module is unloaded. */
+		init_timer (&board->timer);
+
+		if (board->poll) {
+			board->timer.data = (unsigned long) board;
+			board->timer.function = sx_pollfunc;
+			board->timer.expires = jiffies + board->poll;
+			add_timer (&board->timer);
+		}
+	} else {
+		board->irq = 0;
+	}
+
+	board->nports = chans;
+	sx_dprintk (SX_DEBUG_INIT, "returning %d ports.", board->nports);
+
+	func_exit();
+	return chans;
+}
+
+
+static void printheader(void)
+{
+	static int header_printed;
+
+	if (!header_printed) {
+		printk (KERN_INFO "Specialix SX driver "
+		        "(C) 1998/1999 R.E.Wolff@BitWizard.nl \n");
+		printk (KERN_INFO "sx: version %s\n", RCS_ID);
+		header_printed = 1;
+	}
+}
+
+
+static int probe_sx (struct sx_board *board)
+{
+	struct vpd_prom vpdp;
+	char *p;
+	int i;
+
+	func_enter();
+
+	if (!IS_CF_BOARD (board)) {    
+		sx_dprintk (SX_DEBUG_PROBE, "Going to verify vpd prom at %p.\n", 
+		            board->base + SX_VPD_ROM);
+
+		if (sx_debug & SX_DEBUG_PROBE)
+			my_hd_io(board->base + SX_VPD_ROM, 0x40);
+
+		p = (char *) &vpdp;
+		for (i=0;i< sizeof (struct vpd_prom);i++)
+			*p++ = read_sx_byte (board, SX_VPD_ROM + i*2);
+
+		if (sx_debug & SX_DEBUG_PROBE)
+			my_hd (&vpdp, 0x20);
+
+		sx_dprintk (SX_DEBUG_PROBE, "checking identifier...\n");
+
+		if (strncmp (vpdp.identifier, SX_VPD_IDENT_STRING, 16) != 0) {
+			sx_dprintk (SX_DEBUG_PROBE, "Got non-SX identifier: '%s'\n", 
+			            vpdp.identifier); 
+			return 0;
+		}
+	}
+
+	printheader ();
+
+	if (!IS_CF_BOARD (board)) {
+		printk (KERN_DEBUG "sx: Found an SX board at %lx\n", board->hw_base);
+		printk (KERN_DEBUG "sx: hw_rev: %d, assembly level: %d, uniq ID:%08x, ", 
+		        vpdp.hwrev, vpdp.hwass, vpdp.uniqid);
+		printk (           "Manufactured: %d/%d\n", 
+		        1970 + vpdp.myear, vpdp.mweek);
+
+
+		if ((((vpdp.uniqid >> 24) & SX_UNIQUEID_MASK) != SX_PCI_UNIQUEID1) &&
+		    (((vpdp.uniqid >> 24) & SX_UNIQUEID_MASK) != SX_ISA_UNIQUEID1)) {
+			/* This might be a bit harsh. This was the primary reason the
+			   SX/ISA card didn't work at first... */
+			printk (KERN_ERR "sx: Hmm. Not an SX/PCI or SX/ISA card. Sorry: giving up.\n");
+			return (0);
+		}
+
+		if (((vpdp.uniqid >> 24) & SX_UNIQUEID_MASK) == SX_ISA_UNIQUEID1) {
+			if (((unsigned long)board->hw_base) & 0x8000) {
+				printk (KERN_WARNING "sx: Warning: There may be hardware problems with the card at %lx.\n", board->hw_base);
+				printk (KERN_WARNING "sx: Read sx.txt for more info.\n");
+			}
+		}
+	}
+
+	board->nports = -1;
+
+	/* This resets the processor, and keeps it off the bus. */
+	if (!sx_reset (board)) 
+		return 0;
+	sx_dprintk (SX_DEBUG_INIT, "reset the board...\n");
+
+	board->flags |= SX_BOARD_PRESENT;
+
+	func_exit();
+	return 1;
+}
+
+
+
+/* Specialix probes for this card at 32k increments from 640k to 16M.
+   I consider machines with less than 16M unlikely nowadays, so I'm
+   not probing above 1Mb. Also, 0xa0000, 0xb0000, are taken by the VGA
+   card. 0xe0000 and 0xf0000 are taken by the BIOS. That only leaves 
+   0xc0000, 0xc8000, 0xd0000 and 0xd8000 . */
+
+static int probe_si (struct sx_board *board)
+{
+	int i;
+
+	func_enter();
+	sx_dprintk (SX_DEBUG_PROBE, "Going to verify SI signature hw %lx at %p.\n", board->hw_base,
+	            board->base + SI2_ISA_ID_BASE);
+
+	if (sx_debug & SX_DEBUG_PROBE)
+		my_hd_io(board->base + SI2_ISA_ID_BASE, 0x8);
+
+	if (!IS_EISA_BOARD(board)) {
+	  if( IS_SI1_BOARD(board) ) 
+	    {
+		for (i=0;i<8;i++) {
+		  write_sx_byte (board, SI2_ISA_ID_BASE+7-i,i); 
+
+		}
+	    }
+		for (i=0;i<8;i++) {
+			if ((read_sx_byte (board, SI2_ISA_ID_BASE+7-i) & 7) != i) {
+				func_exit ();
+				return 0;
+			}
+		}
+	}
+
+	/* Now we're pretty much convinced that there is an SI board here, 
+	   but to prevent trouble, we'd better double check that we don't
+	   have an SI1 board when we're probing for an SI2 board.... */
+
+	write_sx_byte (board, SI2_ISA_ID_BASE,0x10); 
+	if ( IS_SI1_BOARD(board)) {
+		/* This should be an SI1 board, which has this
+		   location writable... */
+		if (read_sx_byte (board, SI2_ISA_ID_BASE) != 0x10)
+			func_exit ();
+			return 0; 
+	} else {
+		/* This should be an SI2 board, which has the bottom
+		   3 bits non-writable... */
+		if (read_sx_byte (board, SI2_ISA_ID_BASE) == 0x10)
+			func_exit ();
+			return 0; 
+	}
+
+	/* Now we're pretty much convinced that there is an SI board here, 
+	   but to prevent trouble, we'd better double check that we don't
+	   have an SI1 board when we're probing for an SI2 board.... */
+
+	write_sx_byte (board, SI2_ISA_ID_BASE,0x10); 
+	if ( IS_SI1_BOARD(board)) {
+		/* This should be an SI1 board, which has this
+		   location writable... */
+		if (read_sx_byte (board, SI2_ISA_ID_BASE) != 0x10)
+			func_exit();
+			return 0; 
+	} else {
+		/* This should be an SI2 board, which has the bottom
+		   3 bits non-writable... */
+		if (read_sx_byte (board, SI2_ISA_ID_BASE) == 0x10)
+			func_exit ();
+			return 0; 
+	}
+
+	printheader ();
+
+	printk (KERN_DEBUG "sx: Found an SI board at %lx\n", board->hw_base);
+	/* Compared to the SX boards, it is a complete guess as to what
+		 this card is up to... */
+
+	board->nports = -1;
+
+	/* This resets the processor, and keeps it off the bus. */
+	if (!sx_reset (board)) 
+		return 0;
+	sx_dprintk (SX_DEBUG_INIT, "reset the board...\n");
+
+	board->flags |= SX_BOARD_PRESENT;
+
+	func_exit();
+	return 1;
+}
+
+static struct tty_operations sx_ops = {
+	.break_ctl = sx_break,
+	.open	= sx_open,
+	.close = gs_close,
+	.write = gs_write,
+	.put_char = gs_put_char,
+	.flush_chars = gs_flush_chars,
+	.write_room = gs_write_room,
+	.chars_in_buffer = gs_chars_in_buffer,
+	.flush_buffer = gs_flush_buffer,
+	.ioctl = sx_ioctl,
+	.throttle = sx_throttle,
+	.unthrottle = sx_unthrottle,
+	.set_termios = gs_set_termios,
+	.stop = gs_stop,
+	.start = gs_start,
+	.hangup = gs_hangup,
+	.tiocmget = sx_tiocmget,
+	.tiocmset = sx_tiocmset,
+};
+
+static int sx_init_drivers(void)
+{
+	int error;
+
+	func_enter();
+
+	sx_driver = alloc_tty_driver(sx_nports);
+	if (!sx_driver)
+		return 1;
+	sx_driver->owner = THIS_MODULE;
+	sx_driver->driver_name = "specialix_sx";
+	sx_driver->name = "ttyX";
+	sx_driver->major = SX_NORMAL_MAJOR;
+	sx_driver->type = TTY_DRIVER_TYPE_SERIAL;
+	sx_driver->subtype = SERIAL_TYPE_NORMAL;
+	sx_driver->init_termios = tty_std_termios;
+	sx_driver->init_termios.c_cflag =
+	  B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+	sx_driver->flags = TTY_DRIVER_REAL_RAW;
+	tty_set_operations(sx_driver, &sx_ops);
+
+	if ((error = tty_register_driver(sx_driver))) {
+		put_tty_driver(sx_driver);
+		printk(KERN_ERR "sx: Couldn't register sx driver, error = %d\n",
+		       error);
+		return 1;
+	}
+	func_exit();
+	return 0;
+}
+
+
+static void * ckmalloc (int size)
+{
+	void *p;
+
+	p = kmalloc(size, GFP_KERNEL);
+	if (p) 
+		memset(p, 0, size);
+	return p;
+}
+
+
+static int sx_init_portstructs (int nboards, int nports)
+{
+	struct sx_board *board;
+	struct sx_port *port;
+	int i, j;
+	int addr, chans;
+	int portno;
+
+	func_enter();
+
+	/* Many drivers statically allocate the maximum number of ports
+	   There is no reason not to allocate them dynamically. Is there? -- REW */
+	sx_ports          = ckmalloc(nports * sizeof (struct sx_port));
+	if (!sx_ports)
+		return -ENOMEM;
+
+	port = sx_ports;
+	for (i = 0; i < nboards; i++) {
+		board = &boards[i];
+		board->ports = port;
+		for (j=0; j < boards[i].nports;j++) {
+			sx_dprintk (SX_DEBUG_INIT, "initing port %d\n", j);
+			port->gs.magic = SX_MAGIC;
+			port->gs.close_delay = HZ/2;
+			port->gs.closing_wait = 30 * HZ;
+			port->board = board;
+			port->gs.rd = &sx_real_driver;
+#ifdef NEW_WRITE_LOCKING
+			port->gs.port_write_sem = MUTEX;
+#endif
+			port->gs.driver_lock = SPIN_LOCK_UNLOCKED;
+			/*
+			 * Initializing wait queue
+			 */
+			init_waitqueue_head(&port->gs.open_wait);
+			init_waitqueue_head(&port->gs.close_wait); 		
+			
+			port++;
+		}
+	}
+
+	port = sx_ports;
+	portno = 0;
+	for (i = 0; i < nboards; i++) {
+		board = &boards[i];
+		board->port_base = portno;
+		/* Possibly the configuration was rejected. */
+		sx_dprintk (SX_DEBUG_PROBE, "Board has %d channels\n", board->nports);
+		if (board->nports <= 0) continue;
+		/* XXX byteorder ?? */
+		for (addr = 0x80;addr != 0;addr = read_sx_word (board, addr) & 0x7fff) {
+			chans = sx_read_module_byte (board, addr, mc_type); 
+			sx_dprintk (SX_DEBUG_PROBE, "Module at %x: %d channels\n", addr, chans);
+			sx_dprintk (SX_DEBUG_PROBE, "Port at");
+			for (j=0;j<chans;j++) {
+				/* The "sx-way" is the way it SHOULD be done. That way in the 
+				   future, the firmware may for example pack the structures a bit
+				   more efficient. Neil tells me it isn't going to happen anytime
+				   soon though. */
+				if (IS_SX_BOARD(board))
+					port->ch_base = sx_read_module_word (board, addr+j*2, mc_chan_pointer);
+				else
+					port->ch_base = addr + 0x100 + 0x300*j;
+
+				sx_dprintk (SX_DEBUG_PROBE, " %x", port->ch_base);
+				port->line = portno++;
+				port++;
+			}
+			sx_dprintk (SX_DEBUG_PROBE, "\n");
+		}
+		/* This has to be done earlier. */
+		/* board->flags |= SX_BOARD_INITIALIZED; */
+	}
+
+	func_exit();
+	return 0;
+}
+
+static void __exit sx_release_drivers(void)
+{
+	func_enter();
+	tty_unregister_driver(sx_driver);
+	put_tty_driver(sx_driver);
+	func_exit();
+}
+
+#ifdef CONFIG_PCI
+ /******************************************************** 
+ * Setting bit 17 in the CNTRL register of the PLX 9050  * 
+ * chip forces a retry on writes while a read is pending.*
+ * This is to prevent the card locking up on Intel Xeon  *
+ * multiprocessor systems with the NX chipset.    -- NV  *
+ ********************************************************/
+
+/* Newer cards are produced with this bit set from the configuration
+   EEprom.  As the bit is read/write for the CPU, we can fix it here,
+   if we detect that it isn't set correctly. -- REW */
+
+static void fix_sx_pci (struct pci_dev *pdev, struct sx_board *board)
+{
+	unsigned int hwbase;
+	void __iomem *rebase;
+	unsigned int t;
+
+#define CNTRL_REG_OFFSET        0x50
+#define CNTRL_REG_GOODVALUE     0x18260000
+
+	pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &hwbase);
+	hwbase &= PCI_BASE_ADDRESS_MEM_MASK;
+	rebase = ioremap(hwbase, 0x80);
+	t = readl (rebase + CNTRL_REG_OFFSET);
+	if (t != CNTRL_REG_GOODVALUE) {
+		printk (KERN_DEBUG "sx: performing cntrl reg fix: %08x -> %08x\n", t, CNTRL_REG_GOODVALUE); 
+		writel (CNTRL_REG_GOODVALUE, rebase + CNTRL_REG_OFFSET);
+	}
+	iounmap(rebase);
+}
+#endif
+
+
+static int __init sx_init(void) 
+{
+	int i;
+	int found = 0;
+	int eisa_slot;
+	struct sx_board *board;
+
+#ifdef CONFIG_PCI
+	struct pci_dev *pdev = NULL;
+	unsigned int tint;
+	unsigned short tshort;
+#endif
+
+	func_enter();
+	sx_dprintk (SX_DEBUG_INIT, "Initing sx module... (sx_debug=%d)\n", sx_debug);
+	if (abs ((long) (&sx_debug) - sx_debug) < 0x10000) {
+		printk (KERN_WARNING "sx: sx_debug is an address, instead of a value. "
+		        "Assuming -1.\n");
+		printk ("(%p)\n", &sx_debug);
+		sx_debug=-1;
+	}
+
+	if (misc_register(&sx_fw_device) < 0) {
+		printk(KERN_ERR "SX: Unable to register firmware loader driver.\n");
+		return -EIO;
+	}
+
+#ifdef CONFIG_PCI
+	while ((pdev = pci_find_device (PCI_VENDOR_ID_SPECIALIX, 
+					PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8, 
+					      pdev))) {
+		if (pci_enable_device(pdev))
+			continue;
+
+		/* Specialix has a whole bunch of cards with
+		   0x2000 as the device ID. They say its because
+		   the standard requires it. Stupid standard. */
+		/* It seems that reading a word doesn't work reliably on 2.0.
+		   Also, reading a non-aligned dword doesn't work. So we read the
+		   whole dword at 0x2c and extract the word at 0x2e (SUBSYSTEM_ID)
+		   ourselves */
+		/* I don't know why the define doesn't work, constant 0x2c does --REW */ 
+		pci_read_config_dword (pdev, 0x2c, &tint);
+		tshort = (tint >> 16) & 0xffff;
+		sx_dprintk (SX_DEBUG_PROBE, "Got a specialix card: %x.\n", tint);
+		/* sx_dprintk (SX_DEBUG_PROBE, "pdev = %d/%d	(%x)\n", pdev, tint); */ 
+		if ((tshort != 0x0200) && (tshort != 0x0300)) {
+			sx_dprintk (SX_DEBUG_PROBE, "But it's not an SX card (%d)...\n", 
+				    tshort);
+			continue;
+		}
+		board = &boards[found];
+
+		board->flags &= ~SX_BOARD_TYPE;
+		board->flags |= (tshort == 0x200)?SX_PCI_BOARD:
+						  SX_CFPCI_BOARD;
+
+		/* CF boards use base address 3.... */
+		if (IS_CF_BOARD (board))
+			board->hw_base = pci_resource_start (pdev, 3);
+		else
+			board->hw_base = pci_resource_start (pdev, 2);
+		board->base2 = 
+		board->base = ioremap(board->hw_base, WINDOW_LEN (board));
+		if (!board->base) {
+			printk(KERN_ERR "ioremap failed\n");
+			/* XXX handle error */
+		}
+
+		/* Most of the stuff on the CF board is offset by
+		   0x18000 ....  */
+		if (IS_CF_BOARD (board)) board->base += 0x18000;
+
+		board->irq = pdev->irq;
+
+		sx_dprintk (SX_DEBUG_PROBE, "Got a specialix card: %x/%p(%d) %x.\n", 
+			    tint, boards[found].base, board->irq, board->flags);
+
+		if (probe_sx (board)) {
+			found++;
+			fix_sx_pci (pdev, board);
+		} else 
+			iounmap(board->base2);
+	}
+#endif
+
+	for (i=0;i<NR_SX_ADDRS;i++) {
+		board = &boards[found];
+		board->hw_base = sx_probe_addrs[i];
+		board->base2 =
+		board->base = ioremap(board->hw_base, SX_WINDOW_LEN);
+		board->flags &= ~SX_BOARD_TYPE;
+		board->flags |=	SX_ISA_BOARD;
+		board->irq = sx_irqmask?-1:0;
+
+		if (probe_sx (board)) {
+			found++;
+		} else {
+			iounmap(board->base);
+		}
+	}
+
+	for (i=0;i<NR_SI_ADDRS;i++) {
+		board = &boards[found];
+		board->hw_base = si_probe_addrs[i];
+		board->base2 =
+		board->base = ioremap(board->hw_base, SI2_ISA_WINDOW_LEN);
+		board->flags &= ~SX_BOARD_TYPE;
+		board->flags |=  SI_ISA_BOARD;
+		board->irq = sx_irqmask ?-1:0;
+
+		if (probe_si (board)) {
+			found++;
+		} else {
+			iounmap (board->base);
+		}
+	}
+	for (i=0;i<NR_SI1_ADDRS;i++) {
+		board = &boards[found];
+		board->hw_base = si1_probe_addrs[i];
+		board->base2 =
+		board->base = ioremap(board->hw_base, SI1_ISA_WINDOW_LEN);
+		board->flags &= ~SX_BOARD_TYPE;
+		board->flags |=  SI1_ISA_BOARD;
+		board->irq = sx_irqmask ?-1:0;
+
+		if (probe_si (board)) {
+			found++;
+		} else {
+			iounmap (board->base);
+		}
+	}
+
+        sx_dprintk(SX_DEBUG_PROBE, "Probing for EISA cards\n");
+        for(eisa_slot=0x1000; eisa_slot<0x10000; eisa_slot+=0x1000)
+        {
+                if((inb(eisa_slot+0xc80)==0x4d) &&
+                   (inb(eisa_slot+0xc81)==0x98))
+                {
+			sx_dprintk(SX_DEBUG_PROBE, "%s : Signature found in EISA slot %d, Product %d Rev %d\n",
+			                        "XIO", (eisa_slot>>12), inb(eisa_slot+0xc82), inb(eisa_slot+0xc83));
+
+			board = &boards[found];
+			board->eisa_base = eisa_slot;
+			board->flags &= ~SX_BOARD_TYPE;
+			board->flags |= SI_EISA_BOARD;
+
+			board->hw_base = (((inb(0xc01+eisa_slot) << 8) + inb(0xc00+eisa_slot)) << 16);
+			board->base2 =
+			board->base = ioremap(board->hw_base, SI2_EISA_WINDOW_LEN);
+
+			sx_dprintk(SX_DEBUG_PROBE, "IO hw_base address: %lx\n", board->hw_base);
+			sx_dprintk(SX_DEBUG_PROBE, "base: %p\n", board->base);
+			board->irq = inb(board->eisa_base+0xc02)>>4; 
+			sx_dprintk(SX_DEBUG_PROBE, "IRQ: %d\n", board->irq);
+			
+			probe_si(board);
+
+			found++;
+		}
+	}
+	if (found) {
+		printk (KERN_INFO "sx: total of %d boards detected.\n", found);
+	} else {
+		misc_deregister(&sx_fw_device);
+	}
+
+	func_exit();
+	return found?0:-EIO;
+}
+
+
+static void __exit sx_exit (void)
+{
+	int i; 
+	struct sx_board *board;
+
+	func_enter();
+	for (i = 0; i < SX_NBOARDS; i++) {
+		board = &boards[i];
+		if (board->flags & SX_BOARD_INITIALIZED) {
+			sx_dprintk (SX_DEBUG_CLEANUP, "Cleaning up board at %p\n", board->base);
+			/* The board should stop messing with us.
+			   (actually I mean the interrupt) */
+			sx_reset (board);
+			if ((board->irq) && (board->flags & SX_IRQ_ALLOCATED))
+				free_irq (board->irq, board);
+
+			/* It is safe/allowed to del_timer a non-active timer */
+			del_timer (& board->timer);
+			iounmap(board->base);
+		}
+	}
+	if (misc_deregister(&sx_fw_device) < 0) {
+		printk (KERN_INFO "sx: couldn't deregister firmware loader devic\n");
+	}
+	sx_dprintk (SX_DEBUG_CLEANUP, "Cleaning up drivers (%d)\n", sx_initialized);
+	if (sx_initialized)
+		sx_release_drivers ();
+
+	kfree (sx_ports);
+	func_exit();
+}
+
+module_init(sx_init);
+module_exit(sx_exit);
+
+