Linux-2.6.12-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 =