706733c0b36a7e7af833f97580fb978454dc0ed1
[linux-3.10.git] / drivers / char / epca.c
1 /*
2
3  
4         Copyright (C) 1996  Digi International.
5  
6         For technical support please email digiLinux@dgii.com or
7         call Digi tech support at (612) 912-3456
8
9         ** This driver is no longer supported by Digi **
10
11         Much of this design and code came from epca.c which was 
12         copyright (C) 1994, 1995 Troy De Jongh, and subsquently 
13         modified by David Nugent, Christoph Lameter, Mike McLagan. 
14  
15         This program is free software; you can redistribute it and/or modify
16         it under the terms of the GNU General Public License as published by
17         the Free Software Foundation; either version 2 of the License, or
18         (at your option) any later version.
19
20         This program is distributed in the hope that it will be useful,
21         but WITHOUT ANY WARRANTY; without even the implied warranty of
22         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23         GNU General Public License for more details.
24
25         You should have received a copy of the GNU General Public License
26         along with this program; if not, write to the Free Software
27         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28
29 --------------------------------------------------------------------------- */
30 /* See README.epca for change history --DAT*/
31
32
33 #include <linux/module.h>
34 #include <linux/kernel.h>
35 #include <linux/types.h>
36 #include <linux/init.h>
37 #include <linux/serial.h>
38 #include <linux/delay.h>
39 #include <linux/ctype.h>
40 #include <linux/tty.h>
41 #include <linux/tty_flip.h>
42 #include <linux/slab.h>
43 #include <linux/ioport.h>
44 #include <linux/interrupt.h>
45 #include <asm/uaccess.h>
46 #include <asm/io.h>
47 #include <linux/spinlock.h>
48 #include <linux/pci.h>
49 #include "digiPCI.h"
50
51
52 #include "digi1.h"
53 #include "digiFep1.h"
54 #include "epca.h"
55 #include "epcaconfig.h"
56
57 /* ---------------------- Begin defines ------------------------ */
58
59 #define VERSION            "1.3.0.1-LK2.6"
60
61 /* This major needs to be submitted to Linux to join the majors list */
62
63 #define DIGIINFOMAJOR       35  /* For Digi specific ioctl */ 
64
65
66 #define MAXCARDS 7
67 #define epcaassert(x, msg)  if (!(x)) epca_error(__LINE__, msg)
68
69 #define PFX "epca: "
70
71 /* ----------------- Begin global definitions ------------------- */
72
73 static int nbdevs, num_cards, liloconfig;
74 static int digi_poller_inhibited = 1 ;
75
76 static int setup_error_code;
77 static int invalid_lilo_config;
78
79 /* The ISA boards do window flipping into the same spaces so its only sane
80    with a single lock. It's still pretty efficient */
81
82 static DEFINE_SPINLOCK(epca_lock);
83
84 /* -----------------------------------------------------------------------
85         MAXBOARDS is typically 12, but ISA and EISA cards are restricted to 
86         7 below.
87 --------------------------------------------------------------------------*/
88 static struct board_info boards[MAXBOARDS];
89
90
91 /* ------------- Begin structures used for driver registeration ---------- */
92
93 static struct tty_driver *pc_driver;
94 static struct tty_driver *pc_info;
95
96 /* ------------------ Begin Digi specific structures -------------------- */
97
98 /* ------------------------------------------------------------------------
99         digi_channels represents an array of structures that keep track of
100         each channel of the Digi product.  Information such as transmit and
101         receive pointers, termio data, and signal definitions (DTR, CTS, etc ...)
102         are stored here.  This structure is NOT used to overlay the cards 
103         physical channel structure.
104 -------------------------------------------------------------------------- */
105   
106 static struct channel digi_channels[MAX_ALLOC];
107
108 /* ------------------------------------------------------------------------
109         card_ptr is an array used to hold the address of the
110         first channel structure of each card.  This array will hold
111         the addresses of various channels located in digi_channels.
112 -------------------------------------------------------------------------- */
113 static struct channel *card_ptr[MAXCARDS];
114
115 static struct timer_list epca_timer;
116
117 /* ---------------------- Begin function prototypes --------------------- */
118
119 /* ----------------------------------------------------------------------
120         Begin generic memory functions.  These functions will be alias
121         (point at) more specific functions dependent on the board being
122         configured.
123 ----------------------------------------------------------------------- */
124         
125 static void memwinon(struct board_info *b, unsigned int win);
126 static void memwinoff(struct board_info *b, unsigned int win);
127 static void globalwinon(struct channel *ch);
128 static void rxwinon(struct channel *ch);
129 static void txwinon(struct channel *ch);
130 static void memoff(struct channel *ch);
131 static void assertgwinon(struct channel *ch);
132 static void assertmemoff(struct channel *ch);
133
134 /* ---- Begin more 'specific' memory functions for cx_like products --- */
135
136 static void pcxem_memwinon(struct board_info *b, unsigned int win);
137 static void pcxem_memwinoff(struct board_info *b, unsigned int win);
138 static void pcxem_globalwinon(struct channel *ch);
139 static void pcxem_rxwinon(struct channel *ch);
140 static void pcxem_txwinon(struct channel *ch);
141 static void pcxem_memoff(struct channel *ch);
142
143 /* ------ Begin more 'specific' memory functions for the pcxe ------- */
144
145 static void pcxe_memwinon(struct board_info *b, unsigned int win);
146 static void pcxe_memwinoff(struct board_info *b, unsigned int win);
147 static void pcxe_globalwinon(struct channel *ch);
148 static void pcxe_rxwinon(struct channel *ch);
149 static void pcxe_txwinon(struct channel *ch);
150 static void pcxe_memoff(struct channel *ch);
151
152 /* ---- Begin more 'specific' memory functions for the pc64xe and pcxi ---- */
153 /* Note : pc64xe and pcxi share the same windowing routines */
154
155 static void pcxi_memwinon(struct board_info *b, unsigned int win);
156 static void pcxi_memwinoff(struct board_info *b, unsigned int win);
157 static void pcxi_globalwinon(struct channel *ch);
158 static void pcxi_rxwinon(struct channel *ch);
159 static void pcxi_txwinon(struct channel *ch);
160 static void pcxi_memoff(struct channel *ch);
161
162 /* - Begin 'specific' do nothing memory functions needed for some cards - */
163
164 static void dummy_memwinon(struct board_info *b, unsigned int win);
165 static void dummy_memwinoff(struct board_info *b, unsigned int win);
166 static void dummy_globalwinon(struct channel *ch);
167 static void dummy_rxwinon(struct channel *ch);
168 static void dummy_txwinon(struct channel *ch);
169 static void dummy_memoff(struct channel *ch);
170 static void dummy_assertgwinon(struct channel *ch);
171 static void dummy_assertmemoff(struct channel *ch);
172
173 /* ------------------- Begin declare functions ----------------------- */
174
175 static struct channel *verifyChannel(struct tty_struct *);
176 static void pc_sched_event(struct channel *, int);
177 static void epca_error(int, char *);
178 static void pc_close(struct tty_struct *, struct file *);
179 static void shutdown(struct channel *);
180 static void pc_hangup(struct tty_struct *);
181 static void pc_put_char(struct tty_struct *, unsigned char);
182 static int pc_write_room(struct tty_struct *);
183 static int pc_chars_in_buffer(struct tty_struct *);
184 static void pc_flush_buffer(struct tty_struct *);
185 static void pc_flush_chars(struct tty_struct *);
186 static int block_til_ready(struct tty_struct *, struct file *,
187                            struct channel *);
188 static int pc_open(struct tty_struct *, struct file *);
189 static void post_fep_init(unsigned int crd);
190 static void epcapoll(unsigned long);
191 static void doevent(int);
192 static void fepcmd(struct channel *, int, int, int, int, int);
193 static unsigned termios2digi_h(struct channel *ch, unsigned);
194 static unsigned termios2digi_i(struct channel *ch, unsigned);
195 static unsigned termios2digi_c(struct channel *ch, unsigned);
196 static void epcaparam(struct tty_struct *, struct channel *);
197 static void receive_data(struct channel *);
198 static int pc_ioctl(struct tty_struct *, struct file *,
199                     unsigned int, unsigned long);
200 static int info_ioctl(struct tty_struct *, struct file *,
201                     unsigned int, unsigned long);
202 static void pc_set_termios(struct tty_struct *, struct termios *);
203 static void do_softint(void *);
204 static void pc_stop(struct tty_struct *);
205 static void pc_start(struct tty_struct *);
206 static void pc_throttle(struct tty_struct * tty);
207 static void pc_unthrottle(struct tty_struct *tty);
208 static void digi_send_break(struct channel *ch, int msec);
209 static void setup_empty_event(struct tty_struct *tty, struct channel *ch);
210 void epca_setup(char *, int *);
211
212 static int get_termio(struct tty_struct *, struct termio __user *);
213 static int pc_write(struct tty_struct *, const unsigned char *, int);
214 static int pc_init(void);
215 static int init_PCI(void);
216
217
218 /* ------------------------------------------------------------------
219         Table of functions for each board to handle memory.  Mantaining 
220         parallelism is a *very* good idea here.  The idea is for the 
221         runtime code to blindly call these functions, not knowing/caring    
222         about the underlying hardware.  This stuff should contain no
223         conditionals; if more functionality is needed a different entry
224         should be established.  These calls are the interface calls and 
225         are the only functions that should be accessed.  Anyone caught
226         making direct calls deserves what they get.
227 -------------------------------------------------------------------- */
228
229 static void memwinon(struct board_info *b, unsigned int win)
230 {
231         (b->memwinon)(b, win);
232 }
233
234 static void memwinoff(struct board_info *b, unsigned int win)
235 {
236         (b->memwinoff)(b, win);
237 }
238
239 static void globalwinon(struct channel *ch)
240 {
241         (ch->board->globalwinon)(ch);
242 }
243
244 static void rxwinon(struct channel *ch)
245 {
246         (ch->board->rxwinon)(ch);
247 }
248
249 static void txwinon(struct channel *ch)
250 {
251         (ch->board->txwinon)(ch);
252 }
253
254 static void memoff(struct channel *ch)
255 {
256         (ch->board->memoff)(ch);
257 }
258 static void assertgwinon(struct channel *ch)
259 {
260         (ch->board->assertgwinon)(ch);
261 }
262
263 static void assertmemoff(struct channel *ch)
264 {
265         (ch->board->assertmemoff)(ch);
266 }
267
268 /* ---------------------------------------------------------
269         PCXEM windowing is the same as that used in the PCXR 
270         and CX series cards.
271 ------------------------------------------------------------ */
272
273 static void pcxem_memwinon(struct board_info *b, unsigned int win)
274 {
275         outb_p(FEPWIN|win, b->port + 1);
276 }
277
278 static void pcxem_memwinoff(struct board_info *b, unsigned int win)
279 {
280         outb_p(0, b->port + 1);
281 }
282
283 static void pcxem_globalwinon(struct channel *ch)
284 {
285         outb_p( FEPWIN, (int)ch->board->port + 1);
286 }
287
288 static void pcxem_rxwinon(struct channel *ch)
289 {
290         outb_p(ch->rxwin, (int)ch->board->port + 1);
291 }
292
293 static void pcxem_txwinon(struct channel *ch)
294 {
295         outb_p(ch->txwin, (int)ch->board->port + 1);
296 }
297
298 static void pcxem_memoff(struct channel *ch)
299 {
300         outb_p(0, (int)ch->board->port + 1);
301 }
302
303 /* ----------------- Begin pcxe memory window stuff ------------------ */
304
305 static void pcxe_memwinon(struct board_info *b, unsigned int win)
306 {
307                outb_p(FEPWIN | win, b->port + 1);
308 }
309
310 static void pcxe_memwinoff(struct board_info *b, unsigned int win)
311 {
312         outb_p(inb(b->port) & ~FEPMEM,
313                    b->port + 1);
314         outb_p(0, b->port + 1);
315 }
316
317 static void pcxe_globalwinon(struct channel *ch)
318 {
319         outb_p( FEPWIN, (int)ch->board->port + 1);
320 }
321
322 static void pcxe_rxwinon(struct channel *ch)
323 {
324                 outb_p(ch->rxwin, (int)ch->board->port + 1);
325 }
326
327 static void pcxe_txwinon(struct channel *ch)
328 {
329                 outb_p(ch->txwin, (int)ch->board->port + 1);
330 }
331
332 static void pcxe_memoff(struct channel *ch)
333 {
334         outb_p(0, (int)ch->board->port);
335         outb_p(0, (int)ch->board->port + 1);
336 }
337
338 /* ------------- Begin pc64xe and pcxi memory window stuff -------------- */
339
340 static void pcxi_memwinon(struct board_info *b, unsigned int win)
341 {
342                outb_p(inb(b->port) | FEPMEM, b->port);
343 }
344
345 static void pcxi_memwinoff(struct board_info *b, unsigned int win)
346 {
347         outb_p(inb(b->port) & ~FEPMEM, b->port);
348 }
349
350 static void pcxi_globalwinon(struct channel *ch)
351 {
352         outb_p(FEPMEM, ch->board->port);
353 }
354
355 static void pcxi_rxwinon(struct channel *ch)
356 {
357                 outb_p(FEPMEM, ch->board->port);
358 }
359
360 static void pcxi_txwinon(struct channel *ch)
361 {
362                 outb_p(FEPMEM, ch->board->port);
363 }
364
365 static void pcxi_memoff(struct channel *ch)
366 {
367         outb_p(0, ch->board->port);
368 }
369
370 static void pcxi_assertgwinon(struct channel *ch)
371 {
372         epcaassert(inb(ch->board->port) & FEPMEM, "Global memory off");
373 }
374
375 static void pcxi_assertmemoff(struct channel *ch)
376 {
377         epcaassert(!(inb(ch->board->port) & FEPMEM), "Memory on");
378 }
379
380
381 /* ----------------------------------------------------------------------
382         Not all of the cards need specific memory windowing routines.  Some
383         cards (Such as PCI) needs no windowing routines at all.  We provide
384         these do nothing routines so that the same code base can be used.
385         The driver will ALWAYS call a windowing routine if it thinks it needs
386         to; regardless of the card.  However, dependent on the card the routine
387         may or may not do anything.
388 ---------------------------------------------------------------------------*/
389
390 static void dummy_memwinon(struct board_info *b, unsigned int win)
391 {
392 }
393
394 static void dummy_memwinoff(struct board_info *b, unsigned int win)
395 {
396 }
397
398 static void dummy_globalwinon(struct channel *ch)
399 {
400 }
401
402 static void dummy_rxwinon(struct channel *ch)
403 {
404 }
405
406 static void dummy_txwinon(struct channel *ch)
407 {
408 }
409
410 static void dummy_memoff(struct channel *ch)
411 {
412 }
413
414 static void dummy_assertgwinon(struct channel *ch)
415 {
416 }
417
418 static void dummy_assertmemoff(struct channel *ch)
419 {
420 }
421
422 /* ----------------- Begin verifyChannel function ----------------------- */
423 static struct channel *verifyChannel(struct tty_struct *tty)
424 { /* Begin verifyChannel */
425         /* --------------------------------------------------------------------
426                 This routine basically provides a sanity check.  It insures that
427                 the channel returned is within the proper range of addresses as
428                 well as properly initialized.  If some bogus info gets passed in
429                 through tty->driver_data this should catch it.
430                 --------------------------------------------------------------------- */
431         if (tty) {
432                 struct channel *ch = (struct channel *)tty->driver_data;
433                 if ((ch >= &digi_channels[0]) && (ch < &digi_channels[nbdevs])) {
434                         if (ch->magic == EPCA_MAGIC)
435                                 return ch;
436                 }
437         }
438         return NULL;
439
440 } /* End verifyChannel */
441
442 /* ------------------ Begin pc_sched_event ------------------------- */
443
444 static void pc_sched_event(struct channel *ch, int event)
445 {
446         /* ----------------------------------------------------------------------
447                 We call this to schedule interrupt processing on some event.  The 
448                 kernel sees our request and calls the related routine in OUR driver.
449         -------------------------------------------------------------------------*/
450         ch->event |= 1 << event;
451         schedule_work(&ch->tqueue);
452 } /* End pc_sched_event */
453
454 /* ------------------ Begin epca_error ------------------------- */
455
456 static void epca_error(int line, char *msg)
457 {
458         printk(KERN_ERR "epca_error (Digi): line = %d %s\n",line,msg);
459 }
460
461 /* ------------------ Begin pc_close ------------------------- */
462 static void pc_close(struct tty_struct * tty, struct file * filp)
463 {
464         struct channel *ch;
465         unsigned long flags;
466         /* ---------------------------------------------------------
467                 verifyChannel returns the channel from the tty struct
468                 if it is valid.  This serves as a sanity check.
469         ------------------------------------------------------------- */
470         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if ch != NULL */
471                 spin_lock_irqsave(&epca_lock, flags);
472                 if (tty_hung_up_p(filp)) {
473                         spin_unlock_irqrestore(&epca_lock, flags);
474                         return;
475                 }
476                 /* Check to see if the channel is open more than once */
477                 if (ch->count-- > 1)  {
478                         /* Begin channel is open more than once */
479                         /* -------------------------------------------------------------
480                                 Return without doing anything.  Someone might still be using
481                                 the channel.
482                         ---------------------------------------------------------------- */
483                         spin_unlock_irqrestore(&epca_lock, flags);
484                         return;
485                 } /* End channel is open more than once */
486
487                 /* Port open only once go ahead with shutdown & reset */
488                 BUG_ON(ch->count < 0);
489
490                 /* ---------------------------------------------------------------
491                         Let the rest of the driver know the channel is being closed.
492                         This becomes important if an open is attempted before close 
493                         is finished.
494                 ------------------------------------------------------------------ */
495                 ch->asyncflags |= ASYNC_CLOSING;
496                 tty->closing = 1;
497
498                 spin_unlock_irqrestore(&epca_lock, flags);
499
500                 if (ch->asyncflags & ASYNC_INITIALIZED)  {
501                         /* Setup an event to indicate when the transmit buffer empties */
502                         setup_empty_event(tty, ch);             
503                         tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
504                 }
505                 if (tty->driver->flush_buffer)
506                         tty->driver->flush_buffer(tty);
507
508                 tty_ldisc_flush(tty);
509                 shutdown(ch);
510
511                 spin_lock_irqsave(&epca_lock, flags);
512                 tty->closing = 0;
513                 ch->event = 0;
514                 ch->tty = NULL;
515                 spin_unlock_irqrestore(&epca_lock, flags);
516
517                 if (ch->blocked_open)  { /* Begin if blocked_open */
518                         if (ch->close_delay) 
519                                 msleep_interruptible(jiffies_to_msecs(ch->close_delay));
520                         wake_up_interruptible(&ch->open_wait);
521                 } /* End if blocked_open */
522                 ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED | 
523                                       ASYNC_CLOSING);
524                 wake_up_interruptible(&ch->close_wait);
525         } /* End if ch != NULL */
526 } /* End pc_close */ 
527
528 /* ------------------ Begin shutdown  ------------------------- */
529
530 static void shutdown(struct channel *ch)
531 { /* Begin shutdown */
532
533         unsigned long flags;
534         struct tty_struct *tty;
535         struct board_chan __iomem *bc;
536
537         if (!(ch->asyncflags & ASYNC_INITIALIZED)) 
538                 return;
539
540         spin_lock_irqsave(&epca_lock, flags);
541
542         globalwinon(ch);
543         bc = ch->brdchan;
544
545         /* ------------------------------------------------------------------
546                 In order for an event to be generated on the receipt of data the
547                 idata flag must be set. Since we are shutting down, this is not 
548                 necessary clear this flag.
549         --------------------------------------------------------------------- */ 
550
551         if (bc)
552                 writeb(0, &bc->idata);
553         tty = ch->tty;
554
555         /* ----------------------------------------------------------------
556            If we're a modem control device and HUPCL is on, drop RTS & DTR.
557         ------------------------------------------------------------------ */
558
559         if (tty->termios->c_cflag & HUPCL)  {
560                 ch->omodem &= ~(ch->m_rts | ch->m_dtr);
561                 fepcmd(ch, SETMODEM, 0, ch->m_dtr | ch->m_rts, 10, 1);
562         }
563         memoff(ch);
564
565         /* ------------------------------------------------------------------
566                 The channel has officialy been closed.  The next time it is opened
567                 it will have to reinitialized.  Set a flag to indicate this.
568         ---------------------------------------------------------------------- */
569
570         /* Prevent future Digi programmed interrupts from coming active */
571
572         ch->asyncflags &= ~ASYNC_INITIALIZED;
573         spin_unlock_irqrestore(&epca_lock, flags);
574
575 } /* End shutdown */
576
577 /* ------------------ Begin pc_hangup  ------------------------- */
578
579 static void pc_hangup(struct tty_struct *tty)
580 { /* Begin pc_hangup */
581         struct channel *ch;
582         
583         /* ---------------------------------------------------------
584                 verifyChannel returns the channel from the tty struct
585                 if it is valid.  This serves as a sanity check.
586         ------------------------------------------------------------- */
587
588         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if ch != NULL */
589                 unsigned long flags;
590
591                 if (tty->driver->flush_buffer)
592                         tty->driver->flush_buffer(tty);
593                 tty_ldisc_flush(tty);
594                 shutdown(ch);
595
596                 spin_lock_irqsave(&epca_lock, flags);
597                 ch->tty   = NULL;
598                 ch->event = 0;
599                 ch->count = 0;
600                 ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED);
601                 spin_unlock_irqrestore(&epca_lock, flags);
602                 wake_up_interruptible(&ch->open_wait);
603         } /* End if ch != NULL */
604
605 } /* End pc_hangup */
606
607 /* ------------------ Begin pc_write  ------------------------- */
608
609 static int pc_write(struct tty_struct * tty,
610                     const unsigned char *buf, int bytesAvailable)
611 { /* Begin pc_write */
612         unsigned int head, tail;
613         int dataLen;
614         int size;
615         int amountCopied;
616         struct channel *ch;
617         unsigned long flags;
618         int remain;
619         struct board_chan __iomem *bc;
620
621         /* ----------------------------------------------------------------
622                 pc_write is primarily called directly by the kernel routine
623                 tty_write (Though it can also be called by put_char) found in
624                 tty_io.c.  pc_write is passed a line discipline buffer where 
625                 the data to be written out is stored.  The line discipline 
626                 implementation itself is done at the kernel level and is not 
627                 brought into the driver.  
628         ------------------------------------------------------------------- */
629
630         /* ---------------------------------------------------------
631                 verifyChannel returns the channel from the tty struct
632                 if it is valid.  This serves as a sanity check.
633         ------------------------------------------------------------- */
634
635         if ((ch = verifyChannel(tty)) == NULL)
636                 return 0;
637
638         /* Make a pointer to the channel data structure found on the board. */
639
640         bc   = ch->brdchan;
641         size = ch->txbufsize;
642         amountCopied = 0;
643
644         spin_lock_irqsave(&epca_lock, flags);
645         globalwinon(ch);
646
647         head = readw(&bc->tin) & (size - 1);
648         tail = readw(&bc->tout);
649
650         if (tail != readw(&bc->tout))
651                 tail = readw(&bc->tout);
652         tail &= (size - 1);
653
654         /*      If head >= tail, head has not wrapped around. */ 
655         if (head >= tail)  { /* Begin head has not wrapped */
656                 /* ---------------------------------------------------------------
657                         remain (much like dataLen above) represents the total amount of
658                         space available on the card for data.  Here dataLen represents
659                         the space existing between the head pointer and the end of 
660                         buffer.  This is important because a memcpy cannot be told to
661                         automatically wrap around when it hits the buffer end.
662                 ------------------------------------------------------------------ */ 
663                 dataLen = size - head;
664                 remain = size - (head - tail) - 1;
665         } else { /* Begin head has wrapped around */
666
667                 remain = tail - head - 1;
668                 dataLen = remain;
669
670         } /* End head has wrapped around */
671         /* -------------------------------------------------------------------
672                         Check the space on the card.  If we have more data than 
673                         space; reduce the amount of data to fit the space.
674         ---------------------------------------------------------------------- */
675         bytesAvailable = min(remain, bytesAvailable);
676         txwinon(ch);
677         while (bytesAvailable > 0) 
678         { /* Begin while there is data to copy onto card */
679
680                 /* -----------------------------------------------------------------
681                         If head is not wrapped, the below will make sure the first 
682                         data copy fills to the end of card buffer.
683                 ------------------------------------------------------------------- */
684
685                 dataLen = min(bytesAvailable, dataLen);
686                 memcpy_toio(ch->txptr + head, buf, dataLen);
687                 buf += dataLen;
688                 head += dataLen;
689                 amountCopied += dataLen;
690                 bytesAvailable -= dataLen;
691
692                 if (head >= size) {
693                         head = 0;
694                         dataLen = tail;
695                 }
696         } /* End while there is data to copy onto card */
697         ch->statusflags |= TXBUSY;
698         globalwinon(ch);
699         writew(head, &bc->tin);
700
701         if ((ch->statusflags & LOWWAIT) == 0)  {
702                 ch->statusflags |= LOWWAIT;
703                 writeb(1, &bc->ilow);
704         }
705         memoff(ch);
706         spin_unlock_irqrestore(&epca_lock, flags);
707         return(amountCopied);
708
709 } /* End pc_write */
710
711 /* ------------------ Begin pc_put_char  ------------------------- */
712
713 static void pc_put_char(struct tty_struct *tty, unsigned char c)
714 { /* Begin pc_put_char */
715         pc_write(tty, &c, 1);
716 } /* End pc_put_char */
717
718 /* ------------------ Begin pc_write_room  ------------------------- */
719
720 static int pc_write_room(struct tty_struct *tty)
721 { /* Begin pc_write_room */
722
723         int remain;
724         struct channel *ch;
725         unsigned long flags;
726         unsigned int head, tail;
727         struct board_chan __iomem *bc;
728
729         remain = 0;
730
731         /* ---------------------------------------------------------
732                 verifyChannel returns the channel from the tty struct
733                 if it is valid.  This serves as a sanity check.
734         ------------------------------------------------------------- */
735
736         if ((ch = verifyChannel(tty)) != NULL)  {
737                 spin_lock_irqsave(&epca_lock, flags);
738                 globalwinon(ch);
739
740                 bc   = ch->brdchan;
741                 head = readw(&bc->tin) & (ch->txbufsize - 1);
742                 tail = readw(&bc->tout);
743
744                 if (tail != readw(&bc->tout))
745                         tail = readw(&bc->tout);
746                 /* Wrap tail if necessary */
747                 tail &= (ch->txbufsize - 1);
748
749                 if ((remain = tail - head - 1) < 0 )
750                         remain += ch->txbufsize;
751
752                 if (remain && (ch->statusflags & LOWWAIT) == 0) {
753                         ch->statusflags |= LOWWAIT;
754                         writeb(1, &bc->ilow);
755                 }
756                 memoff(ch);
757                 spin_unlock_irqrestore(&epca_lock, flags);
758         }
759         /* Return how much room is left on card */
760         return remain;
761
762 } /* End pc_write_room */
763
764 /* ------------------ Begin pc_chars_in_buffer  ---------------------- */
765
766 static int pc_chars_in_buffer(struct tty_struct *tty)
767 { /* Begin pc_chars_in_buffer */
768
769         int chars;
770         unsigned int ctail, head, tail;
771         int remain;
772         unsigned long flags;
773         struct channel *ch;
774         struct board_chan __iomem *bc;
775
776         /* ---------------------------------------------------------
777                 verifyChannel returns the channel from the tty struct
778                 if it is valid.  This serves as a sanity check.
779         ------------------------------------------------------------- */
780
781         if ((ch = verifyChannel(tty)) == NULL)
782                 return(0);
783
784         spin_lock_irqsave(&epca_lock, flags);
785         globalwinon(ch);
786
787         bc = ch->brdchan;
788         tail = readw(&bc->tout);
789         head = readw(&bc->tin);
790         ctail = readw(&ch->mailbox->cout);
791
792         if (tail == head && readw(&ch->mailbox->cin) == ctail && readb(&bc->tbusy) == 0)
793                 chars = 0;
794         else  { /* Begin if some space on the card has been used */
795                 head = readw(&bc->tin) & (ch->txbufsize - 1);
796                 tail &= (ch->txbufsize - 1);
797                 /*  --------------------------------------------------------------
798                         The logic here is basically opposite of the above pc_write_room
799                         here we are finding the amount of bytes in the buffer filled.
800                         Not the amount of bytes empty.
801                 ------------------------------------------------------------------- */
802                 if ((remain = tail - head - 1) < 0 )
803                         remain += ch->txbufsize;
804                 chars = (int)(ch->txbufsize - remain);
805                 /* -------------------------------------------------------------  
806                         Make it possible to wakeup anything waiting for output
807                         in tty_ioctl.c, etc.
808
809                         If not already set.  Setup an event to indicate when the
810                         transmit buffer empties 
811                 ----------------------------------------------------------------- */
812                 if (!(ch->statusflags & EMPTYWAIT))
813                         setup_empty_event(tty,ch);
814
815         } /* End if some space on the card has been used */
816         memoff(ch);
817         spin_unlock_irqrestore(&epca_lock, flags);
818         /* Return number of characters residing on card. */
819         return(chars);
820
821 } /* End pc_chars_in_buffer */
822
823 /* ------------------ Begin pc_flush_buffer  ---------------------- */
824
825 static void pc_flush_buffer(struct tty_struct *tty)
826 { /* Begin pc_flush_buffer */
827
828         unsigned int tail;
829         unsigned long flags;
830         struct channel *ch;
831         struct board_chan __iomem *bc;
832         /* ---------------------------------------------------------
833                 verifyChannel returns the channel from the tty struct
834                 if it is valid.  This serves as a sanity check.
835         ------------------------------------------------------------- */
836         if ((ch = verifyChannel(tty)) == NULL)
837                 return;
838
839         spin_lock_irqsave(&epca_lock, flags);
840         globalwinon(ch);
841         bc   = ch->brdchan;
842         tail = readw(&bc->tout);
843         /* Have FEP move tout pointer; effectively flushing transmit buffer */
844         fepcmd(ch, STOUT, (unsigned) tail, 0, 0, 0);
845         memoff(ch);
846         spin_unlock_irqrestore(&epca_lock, flags);
847         wake_up_interruptible(&tty->write_wait);
848         tty_wakeup(tty);
849 } /* End pc_flush_buffer */
850
851 /* ------------------ Begin pc_flush_chars  ---------------------- */
852
853 static void pc_flush_chars(struct tty_struct *tty)
854 { /* Begin pc_flush_chars */
855         struct channel * ch;
856         /* ---------------------------------------------------------
857                 verifyChannel returns the channel from the tty struct
858                 if it is valid.  This serves as a sanity check.
859         ------------------------------------------------------------- */
860         if ((ch = verifyChannel(tty)) != NULL) {
861                 unsigned long flags;
862                 spin_lock_irqsave(&epca_lock, flags);
863                 /* ----------------------------------------------------------------
864                         If not already set and the transmitter is busy setup an event
865                         to indicate when the transmit empties.
866                 ------------------------------------------------------------------- */
867                 if ((ch->statusflags & TXBUSY) && !(ch->statusflags & EMPTYWAIT))
868                         setup_empty_event(tty,ch);
869                 spin_unlock_irqrestore(&epca_lock, flags);
870         }
871 } /* End pc_flush_chars */
872
873 /* ------------------ Begin block_til_ready  ---------------------- */
874
875 static int block_til_ready(struct tty_struct *tty, 
876                            struct file *filp, struct channel *ch)
877 { /* Begin block_til_ready */
878         DECLARE_WAITQUEUE(wait,current);
879         int     retval, do_clocal = 0;
880         unsigned long flags;
881
882         if (tty_hung_up_p(filp)) {
883                 if (ch->asyncflags & ASYNC_HUP_NOTIFY)
884                         retval = -EAGAIN;
885                 else
886                         retval = -ERESTARTSYS;  
887                 return(retval);
888         }
889
890         /* ----------------------------------------------------------------- 
891                 If the device is in the middle of being closed, then block
892                 until it's done, and then try again.
893         -------------------------------------------------------------------- */
894         if (ch->asyncflags & ASYNC_CLOSING) {
895                 interruptible_sleep_on(&ch->close_wait);
896
897                 if (ch->asyncflags & ASYNC_HUP_NOTIFY)
898                         return -EAGAIN;
899                 else
900                         return -ERESTARTSYS;
901         }
902
903         if (filp->f_flags & O_NONBLOCK)  {
904                 /* ----------------------------------------------------------------- 
905                  If non-blocking mode is set, then make the check up front
906                  and then exit.
907                 -------------------------------------------------------------------- */
908                 ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
909                 return 0;
910         }
911         if (tty->termios->c_cflag & CLOCAL)
912                 do_clocal = 1;
913         /* Block waiting for the carrier detect and the line to become free */
914         
915         retval = 0;
916         add_wait_queue(&ch->open_wait, &wait);
917
918         spin_lock_irqsave(&epca_lock, flags);
919         /* We dec count so that pc_close will know when to free things */
920         if (!tty_hung_up_p(filp))
921                 ch->count--;
922         ch->blocked_open++;
923         while(1) 
924         { /* Begin forever while  */
925                 set_current_state(TASK_INTERRUPTIBLE);
926                 if (tty_hung_up_p(filp) ||
927                     !(ch->asyncflags & ASYNC_INITIALIZED)) 
928                 {
929                         if (ch->asyncflags & ASYNC_HUP_NOTIFY)
930                                 retval = -EAGAIN;
931                         else
932                                 retval = -ERESTARTSYS;  
933                         break;
934                 }
935                 if (!(ch->asyncflags & ASYNC_CLOSING) && 
936                           (do_clocal || (ch->imodem & ch->dcd)))
937                         break;
938                 if (signal_pending(current)) {
939                         retval = -ERESTARTSYS;
940                         break;
941                 }
942                 spin_unlock_irqrestore(&epca_lock, flags);
943                 /* ---------------------------------------------------------------
944                         Allow someone else to be scheduled.  We will occasionally go
945                         through this loop until one of the above conditions change.
946                         The below schedule call will allow other processes to enter and
947                         prevent this loop from hogging the cpu.
948                 ------------------------------------------------------------------ */
949                 schedule();
950                 spin_lock_irqsave(&epca_lock, flags);
951
952         } /* End forever while  */
953
954         current->state = TASK_RUNNING;
955         remove_wait_queue(&ch->open_wait, &wait);
956         if (!tty_hung_up_p(filp))
957                 ch->count++;
958         ch->blocked_open--;
959
960         spin_unlock_irqrestore(&epca_lock, flags);
961
962         if (retval)
963                 return retval;
964
965         ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
966         return 0;
967 } /* End block_til_ready */     
968
969 /* ------------------ Begin pc_open  ---------------------- */
970
971 static int pc_open(struct tty_struct *tty, struct file * filp)
972 { /* Begin pc_open */
973
974         struct channel *ch;
975         unsigned long flags;
976         int line, retval, boardnum;
977         struct board_chan __iomem *bc;
978         unsigned int head;
979
980         line = tty->index;
981         if (line < 0 || line >= nbdevs)
982                 return -ENODEV;
983
984         ch = &digi_channels[line];
985         boardnum = ch->boardnum;
986
987         /* Check status of board configured in system.  */
988
989         /* -----------------------------------------------------------------
990                 I check to see if the epca_setup routine detected an user error.  
991                 It might be better to put this in pc_init, but for the moment it
992                 goes here.
993         ---------------------------------------------------------------------- */
994
995         if (invalid_lilo_config) {
996                 if (setup_error_code & INVALID_BOARD_TYPE)
997                         printk(KERN_ERR "epca: pc_open: Invalid board type specified in kernel options.\n");
998                 if (setup_error_code & INVALID_NUM_PORTS)
999                         printk(KERN_ERR "epca: pc_open: Invalid number of ports specified in kernel options.\n");
1000                 if (setup_error_code & INVALID_MEM_BASE)
1001                         printk(KERN_ERR "epca: pc_open: Invalid board memory address specified in kernel options.\n");
1002                 if (setup_error_code & INVALID_PORT_BASE)
1003                         printk(KERN_ERR "epca; pc_open: Invalid board port address specified in kernel options.\n");
1004                 if (setup_error_code & INVALID_BOARD_STATUS)
1005                         printk(KERN_ERR "epca: pc_open: Invalid board status specified in kernel options.\n");
1006                 if (setup_error_code & INVALID_ALTPIN)
1007                         printk(KERN_ERR "epca: pc_open: Invalid board altpin specified in kernel options;\n");
1008                 tty->driver_data = NULL;   /* Mark this device as 'down' */
1009                 return -ENODEV;
1010         }
1011         if (boardnum >= num_cards || boards[boardnum].status == DISABLED)  {
1012                 tty->driver_data = NULL;   /* Mark this device as 'down' */
1013                 return(-ENODEV);
1014         }
1015         
1016         if ((bc = ch->brdchan) == 0) {
1017                 tty->driver_data = NULL;
1018                 return -ENODEV;
1019         }
1020
1021         spin_lock_irqsave(&epca_lock, flags);
1022         /* ------------------------------------------------------------------
1023                 Every time a channel is opened, increment a counter.  This is 
1024                 necessary because we do not wish to flush and shutdown the channel
1025                 until the last app holding the channel open, closes it.         
1026         --------------------------------------------------------------------- */
1027         ch->count++;
1028         /* ----------------------------------------------------------------
1029                 Set a kernel structures pointer to our local channel 
1030                 structure.  This way we can get to it when passed only
1031                 a tty struct.
1032         ------------------------------------------------------------------ */
1033         tty->driver_data = ch;
1034         /* ----------------------------------------------------------------
1035                 If this is the first time the channel has been opened, initialize
1036                 the tty->termios struct otherwise let pc_close handle it.
1037         -------------------------------------------------------------------- */
1038         globalwinon(ch);
1039         ch->statusflags = 0;
1040
1041         /* Save boards current modem status */
1042         ch->imodem = readb(&bc->mstat);
1043
1044         /* ----------------------------------------------------------------
1045            Set receive head and tail ptrs to each other.  This indicates
1046            no data available to read.
1047         ----------------------------------------------------------------- */
1048         head = readw(&bc->rin);
1049         writew(head, &bc->rout);
1050
1051         /* Set the channels associated tty structure */
1052         ch->tty = tty;
1053
1054         /* -----------------------------------------------------------------
1055                 The below routine generally sets up parity, baud, flow control 
1056                 issues, etc.... It effect both control flags and input flags.
1057         -------------------------------------------------------------------- */
1058         epcaparam(tty,ch);
1059         ch->asyncflags |= ASYNC_INITIALIZED;
1060         memoff(ch);
1061         spin_unlock_irqrestore(&epca_lock, flags);
1062
1063         retval = block_til_ready(tty, filp, ch);
1064         if (retval)
1065                 return retval;
1066         /* -------------------------------------------------------------
1067                 Set this again in case a hangup set it to zero while this 
1068                 open() was waiting for the line...
1069         --------------------------------------------------------------- */
1070         spin_lock_irqsave(&epca_lock, flags);
1071         ch->tty = tty;
1072         globalwinon(ch);
1073         /* Enable Digi Data events */
1074         writeb(1, &bc->idata);
1075         memoff(ch);
1076         spin_unlock_irqrestore(&epca_lock, flags);
1077         return 0;
1078 } /* End pc_open */
1079
1080 static int __init epca_module_init(void)
1081 { /* Begin init_module */
1082         return pc_init();
1083 }
1084
1085 module_init(epca_module_init);
1086
1087 static struct pci_driver epca_driver;
1088
1089 static void __exit epca_module_exit(void)
1090 {
1091         int               count, crd;
1092         struct board_info *bd;
1093         struct channel    *ch;
1094
1095         del_timer_sync(&epca_timer);
1096
1097         if ((tty_unregister_driver(pc_driver)) ||  
1098             (tty_unregister_driver(pc_info)))
1099         {
1100                 printk(KERN_WARNING "epca: cleanup_module failed to un-register tty driver\n");
1101                 return;
1102         }
1103         put_tty_driver(pc_driver);
1104         put_tty_driver(pc_info);
1105
1106         for (crd = 0; crd < num_cards; crd++)  { /* Begin for each card */
1107                 bd = &boards[crd];
1108                 if (!bd)
1109                 { /* Begin sanity check */
1110                         printk(KERN_ERR "<Error> - Digi : cleanup_module failed\n");
1111                         return;
1112                 } /* End sanity check */
1113                 ch = card_ptr[crd];
1114                 for (count = 0; count < bd->numports; count++, ch++) 
1115                 { /* Begin for each port */
1116                         if (ch && ch->tty)
1117                                 tty_hangup(ch->tty);
1118                 } /* End for each port */
1119         } /* End for each card */
1120         pci_unregister_driver (&epca_driver);
1121 }
1122
1123 module_exit(epca_module_exit);
1124
1125 static const struct tty_operations pc_ops = {
1126         .open = pc_open,
1127         .close = pc_close,
1128         .write = pc_write,
1129         .write_room = pc_write_room,
1130         .flush_buffer = pc_flush_buffer,
1131         .chars_in_buffer = pc_chars_in_buffer,
1132         .flush_chars = pc_flush_chars,
1133         .put_char = pc_put_char,
1134         .ioctl = pc_ioctl,
1135         .set_termios = pc_set_termios,
1136         .stop = pc_stop,
1137         .start = pc_start,
1138         .throttle = pc_throttle,
1139         .unthrottle = pc_unthrottle,
1140         .hangup = pc_hangup,
1141 };
1142
1143 static int info_open(struct tty_struct *tty, struct file * filp)
1144 {
1145         return 0;
1146 }
1147
1148 static struct tty_operations info_ops = {
1149         .open = info_open,
1150         .ioctl = info_ioctl,
1151 };
1152
1153 /* ------------------ Begin pc_init  ---------------------- */
1154
1155 static int __init pc_init(void)
1156 { /* Begin pc_init */
1157         int crd;
1158         struct board_info *bd;
1159         unsigned char board_id = 0;
1160         int err = -ENOMEM;
1161
1162         int pci_boards_found, pci_count;
1163
1164         pci_count = 0;
1165
1166         pc_driver = alloc_tty_driver(MAX_ALLOC);
1167         if (!pc_driver)
1168                 goto out1;
1169
1170         pc_info = alloc_tty_driver(MAX_ALLOC);
1171         if (!pc_info)
1172                 goto out2;
1173
1174         /* -----------------------------------------------------------------------
1175                 If epca_setup has not been ran by LILO set num_cards to defaults; copy
1176                 board structure defined by digiConfig into drivers board structure.
1177                 Note : If LILO has ran epca_setup then epca_setup will handle defining
1178                 num_cards as well as copying the data into the board structure.
1179         -------------------------------------------------------------------------- */
1180         if (!liloconfig) { /* Begin driver has been configured via. epcaconfig */
1181
1182                 nbdevs = NBDEVS;
1183                 num_cards = NUMCARDS;
1184                 memcpy((void *)&boards, (void *)&static_boards,
1185                        (sizeof(struct board_info) * NUMCARDS));
1186         } /* End driver has been configured via. epcaconfig */
1187
1188         /* -----------------------------------------------------------------
1189                 Note : If lilo was used to configure the driver and the 
1190                 ignore epcaconfig option was choosen (digiepca=2) then 
1191                 nbdevs and num_cards will equal 0 at this point.  This is
1192                 okay; PCI cards will still be picked up if detected.
1193         --------------------------------------------------------------------- */
1194
1195         /*  -----------------------------------------------------------
1196                 Set up interrupt, we will worry about memory allocation in
1197                 post_fep_init. 
1198         --------------------------------------------------------------- */
1199
1200
1201         printk(KERN_INFO "DIGI epca driver version %s loaded.\n",VERSION);
1202
1203         /* ------------------------------------------------------------------
1204                 NOTE : This code assumes that the number of ports found in 
1205                        the boards array is correct.  This could be wrong if
1206                        the card in question is PCI (And therefore has no ports 
1207                        entry in the boards structure.)  The rest of the 
1208                        information will be valid for PCI because the beginning
1209                        of pc_init scans for PCI and determines i/o and base
1210                        memory addresses.  I am not sure if it is possible to 
1211                        read the number of ports supported by the card prior to
1212                        it being booted (Since that is the state it is in when 
1213                        pc_init is run).  Because it is not possible to query the
1214                        number of supported ports until after the card has booted;
1215                        we are required to calculate the card_ptrs as the card is         
1216                        is initialized (Inside post_fep_init).  The negative thing
1217                        about this approach is that digiDload's call to GET_INFO
1218                        will have a bad port value.  (Since this is called prior
1219                        to post_fep_init.)
1220
1221         --------------------------------------------------------------------- */
1222   
1223         pci_boards_found = 0;
1224         if(num_cards < MAXBOARDS)
1225                 pci_boards_found += init_PCI();
1226         num_cards += pci_boards_found;
1227
1228         pc_driver->owner = THIS_MODULE;
1229         pc_driver->name = "ttyD"; 
1230         pc_driver->major = DIGI_MAJOR; 
1231         pc_driver->minor_start = 0;
1232         pc_driver->type = TTY_DRIVER_TYPE_SERIAL;
1233         pc_driver->subtype = SERIAL_TYPE_NORMAL;
1234         pc_driver->init_termios = tty_std_termios;
1235         pc_driver->init_termios.c_iflag = 0;
1236         pc_driver->init_termios.c_oflag = 0;
1237         pc_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1238         pc_driver->init_termios.c_lflag = 0;
1239         pc_driver->flags = TTY_DRIVER_REAL_RAW;
1240         tty_set_operations(pc_driver, &pc_ops);
1241
1242         pc_info->owner = THIS_MODULE;
1243         pc_info->name = "digi_ctl";
1244         pc_info->major = DIGIINFOMAJOR;
1245         pc_info->minor_start = 0;
1246         pc_info->type = TTY_DRIVER_TYPE_SERIAL;
1247         pc_info->subtype = SERIAL_TYPE_INFO;
1248         pc_info->init_termios = tty_std_termios;
1249         pc_info->init_termios.c_iflag = 0;
1250         pc_info->init_termios.c_oflag = 0;
1251         pc_info->init_termios.c_lflag = 0;
1252         pc_info->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
1253         pc_info->flags = TTY_DRIVER_REAL_RAW;
1254         tty_set_operations(pc_info, &info_ops);
1255
1256
1257         for (crd = 0; crd < num_cards; crd++) 
1258         { /* Begin for each card */
1259
1260                 /*  ------------------------------------------------------------------
1261                         This is where the appropriate memory handlers for the hardware is
1262                         set.  Everything at runtime blindly jumps through these vectors.
1263                 ---------------------------------------------------------------------- */
1264
1265                 /* defined in epcaconfig.h */
1266                 bd = &boards[crd];
1267
1268                 switch (bd->type)
1269                 { /* Begin switch on bd->type {board type} */
1270                         case PCXEM:
1271                         case EISAXEM:
1272                                 bd->memwinon     = pcxem_memwinon ;
1273                                 bd->memwinoff    = pcxem_memwinoff ;
1274                                 bd->globalwinon  = pcxem_globalwinon ;
1275                                 bd->txwinon      = pcxem_txwinon ;
1276                                 bd->rxwinon      = pcxem_rxwinon ;
1277                                 bd->memoff       = pcxem_memoff ;
1278                                 bd->assertgwinon = dummy_assertgwinon;
1279                                 bd->assertmemoff = dummy_assertmemoff;
1280                                 break;
1281
1282                         case PCIXEM:
1283                         case PCIXRJ:
1284                         case PCIXR:
1285                                 bd->memwinon     = dummy_memwinon;
1286                                 bd->memwinoff    = dummy_memwinoff;
1287                                 bd->globalwinon  = dummy_globalwinon;
1288                                 bd->txwinon      = dummy_txwinon;
1289                                 bd->rxwinon      = dummy_rxwinon;
1290                                 bd->memoff       = dummy_memoff;
1291                                 bd->assertgwinon = dummy_assertgwinon;
1292                                 bd->assertmemoff = dummy_assertmemoff;
1293                                 break;
1294
1295                         case PCXE:
1296                         case PCXEVE:
1297
1298                                 bd->memwinon     = pcxe_memwinon;
1299                                 bd->memwinoff    = pcxe_memwinoff;
1300                                 bd->globalwinon  = pcxe_globalwinon;
1301                                 bd->txwinon      = pcxe_txwinon;
1302                                 bd->rxwinon      = pcxe_rxwinon;
1303                                 bd->memoff       = pcxe_memoff;
1304                                 bd->assertgwinon = dummy_assertgwinon;
1305                                 bd->assertmemoff = dummy_assertmemoff;
1306                                 break;
1307
1308                         case PCXI:
1309                         case PC64XE:
1310
1311                                 bd->memwinon     = pcxi_memwinon;
1312                                 bd->memwinoff    = pcxi_memwinoff;
1313                                 bd->globalwinon  = pcxi_globalwinon;
1314                                 bd->txwinon      = pcxi_txwinon;
1315                                 bd->rxwinon      = pcxi_rxwinon;
1316                                 bd->memoff       = pcxi_memoff;
1317                                 bd->assertgwinon = pcxi_assertgwinon;
1318                                 bd->assertmemoff = pcxi_assertmemoff;
1319                                 break;
1320
1321                         default:
1322                                 break;
1323
1324                 } /* End switch on bd->type */
1325
1326                 /* ---------------------------------------------------------------
1327                         Some cards need a memory segment to be defined for use in 
1328                         transmit and receive windowing operations.  These boards
1329                         are listed in the below switch.  In the case of the XI the
1330                         amount of memory on the board is variable so the memory_seg
1331                         is also variable.  This code determines what they segment 
1332                         should be.
1333                 ----------------------------------------------------------------- */
1334
1335                 switch (bd->type)
1336                 { /* Begin switch on bd->type {board type} */
1337
1338                         case PCXE:
1339                         case PCXEVE:
1340                         case PC64XE:
1341                                 bd->memory_seg = 0xf000;
1342                         break;
1343
1344                         case PCXI:
1345                                 board_id = inb((int)bd->port);
1346                                 if ((board_id & 0x1) == 0x1) 
1347                                 { /* Begin it's an XI card */ 
1348
1349                                         /* Is it a 64K board */
1350                                         if ((board_id & 0x30) == 0) 
1351                                                 bd->memory_seg = 0xf000;
1352
1353                                         /* Is it a 128K board */
1354                                         if ((board_id & 0x30) == 0x10) 
1355                                                 bd->memory_seg = 0xe000;
1356
1357                                         /* Is is a 256K board */        
1358                                         if ((board_id & 0x30) == 0x20) 
1359                                                 bd->memory_seg = 0xc000;
1360
1361                                         /* Is it a 512K board */
1362                                         if ((board_id & 0x30) == 0x30) 
1363                                                 bd->memory_seg = 0x8000;
1364
1365                                 } else printk(KERN_ERR "epca: Board at 0x%x doesn't appear to be an XI\n",(int)bd->port);
1366                         break;
1367
1368                 } /* End switch on bd->type */
1369
1370         } /* End for each card */
1371
1372         err = tty_register_driver(pc_driver);
1373         if (err) {
1374                 printk(KERN_ERR "Couldn't register Digi PC/ driver");
1375                 goto out3;
1376         }
1377
1378         err = tty_register_driver(pc_info);
1379         if (err) {
1380                 printk(KERN_ERR "Couldn't register Digi PC/ info ");
1381                 goto out4;
1382         }
1383
1384         /* -------------------------------------------------------------------
1385            Start up the poller to check for events on all enabled boards
1386         ---------------------------------------------------------------------- */
1387
1388         init_timer(&epca_timer);
1389         epca_timer.function = epcapoll;
1390         mod_timer(&epca_timer, jiffies + HZ/25);
1391         return 0;
1392
1393 out4:
1394         tty_unregister_driver(pc_driver);
1395 out3:
1396         put_tty_driver(pc_info);
1397 out2:
1398         put_tty_driver(pc_driver);
1399 out1:
1400         return err;
1401
1402 } /* End pc_init */
1403
1404 /* ------------------ Begin post_fep_init  ---------------------- */
1405
1406 static void post_fep_init(unsigned int crd)
1407 { /* Begin post_fep_init */
1408
1409         int i;
1410         void __iomem *memaddr;
1411         struct global_data __iomem *gd;
1412         struct board_info *bd;
1413         struct board_chan __iomem *bc;
1414         struct channel *ch; 
1415         int shrinkmem = 0, lowwater ; 
1416  
1417         /*  -------------------------------------------------------------
1418                 This call is made by the user via. the ioctl call DIGI_INIT.
1419                 It is responsible for setting up all the card specific stuff.
1420         ---------------------------------------------------------------- */
1421         bd = &boards[crd];
1422
1423         /* -----------------------------------------------------------------
1424                 If this is a PCI board, get the port info.  Remember PCI cards
1425                 do not have entries into the epcaconfig.h file, so we can't get 
1426                 the number of ports from it.  Unfortunetly, this means that anyone
1427                 doing a DIGI_GETINFO before the board has booted will get an invalid
1428                 number of ports returned (It should return 0).  Calls to DIGI_GETINFO
1429                 after DIGI_INIT has been called will return the proper values. 
1430         ------------------------------------------------------------------- */
1431
1432         if (bd->type >= PCIXEM) { /* Begin get PCI number of ports */
1433                 /* --------------------------------------------------------------------
1434                         Below we use XEMPORTS as a memory offset regardless of which PCI
1435                         card it is.  This is because all of the supported PCI cards have
1436                         the same memory offset for the channel data.  This will have to be
1437                         changed if we ever develop a PCI/XE card.  NOTE : The FEP manual
1438                         states that the port offset is 0xC22 as opposed to 0xC02.  This is
1439                         only true for PC/XE, and PC/XI cards; not for the XEM, or CX series.
1440                         On the PCI cards the number of ports is determined by reading a 
1441                         ID PROM located in the box attached to the card.  The card can then
1442                         determine the index the id to determine the number of ports available.
1443                         (FYI - The id should be located at 0x1ac (And may use up to 4 bytes
1444                         if the box in question is a XEM or CX)).  
1445                 ------------------------------------------------------------------------ */ 
1446                 /* PCI cards are already remapped at this point ISA are not */
1447                 bd->numports = readw(bd->re_map_membase + XEMPORTS);
1448                 epcaassert(bd->numports <= 64,"PCI returned a invalid number of ports");
1449                 nbdevs += (bd->numports);
1450         } else {
1451                 /* Fix up the mappings for ISA/EISA etc */
1452                 /* FIXME: 64K - can we be smarter ? */
1453                 bd->re_map_membase = ioremap(bd->membase, 0x10000);
1454         }
1455
1456         if (crd != 0)
1457                 card_ptr[crd] = card_ptr[crd-1] + boards[crd-1].numports;
1458         else
1459                 card_ptr[crd] = &digi_channels[crd]; /* <- For card 0 only */
1460
1461         ch = card_ptr[crd];
1462         epcaassert(ch <= &digi_channels[nbdevs - 1], "ch out of range");
1463
1464         memaddr = bd->re_map_membase;
1465
1466         /* -----------------------------------------------------------------
1467                 The below assignment will set bc to point at the BEGINING of
1468                 the cards channel structures.  For 1 card there will be between
1469                 8 and 64 of these structures.
1470         -------------------------------------------------------------------- */
1471
1472         bc = memaddr + CHANSTRUCT;
1473
1474         /* -------------------------------------------------------------------
1475                 The below assignment will set gd to point at the BEGINING of
1476                 global memory address 0xc00.  The first data in that global
1477                 memory actually starts at address 0xc1a.  The command in 
1478                 pointer begins at 0xd10.
1479         ---------------------------------------------------------------------- */
1480
1481         gd = memaddr + GLOBAL;
1482
1483         /* --------------------------------------------------------------------
1484                 XEPORTS (address 0xc22) points at the number of channels the
1485                 card supports. (For 64XE, XI, XEM, and XR use 0xc02)
1486         ----------------------------------------------------------------------- */
1487
1488         if ((bd->type == PCXEVE || bd->type == PCXE) && (readw(memaddr + XEPORTS) < 3))
1489                 shrinkmem = 1;
1490         if (bd->type < PCIXEM)
1491                 if (!request_region((int)bd->port, 4, board_desc[bd->type]))
1492                         return;         
1493         memwinon(bd, 0);
1494
1495         /*  --------------------------------------------------------------------
1496                 Remember ch is the main drivers channels structure, while bc is 
1497            the cards channel structure.
1498         ------------------------------------------------------------------------ */
1499
1500         /* For every port on the card do ..... */
1501
1502         for (i = 0; i < bd->numports; i++, ch++, bc++)  { /* Begin for each port */
1503                 unsigned long flags;
1504                 u16 tseg, rseg;
1505
1506                 ch->brdchan        = bc;
1507                 ch->mailbox        = gd; 
1508                 INIT_WORK(&ch->tqueue, do_softint, ch);
1509                 ch->board          = &boards[crd];
1510
1511                 spin_lock_irqsave(&epca_lock, flags);
1512                 switch (bd->type) {
1513                         /* ----------------------------------------------------------------
1514                                 Since some of the boards use different bitmaps for their
1515                                 control signals we cannot hard code these values and retain
1516                                 portability.  We virtualize this data here.
1517                         ------------------------------------------------------------------- */
1518                         case EISAXEM:
1519                         case PCXEM:
1520                         case PCIXEM:
1521                         case PCIXRJ:
1522                         case PCIXR:
1523                                 ch->m_rts = 0x02 ;
1524                                 ch->m_dcd = 0x80 ; 
1525                                 ch->m_dsr = 0x20 ;
1526                                 ch->m_cts = 0x10 ;
1527                                 ch->m_ri  = 0x40 ;
1528                                 ch->m_dtr = 0x01 ;
1529                                 break;
1530
1531                         case PCXE:
1532                         case PCXEVE:
1533                         case PCXI:
1534                         case PC64XE:
1535                                 ch->m_rts = 0x02 ;
1536                                 ch->m_dcd = 0x08 ; 
1537                                 ch->m_dsr = 0x10 ;
1538                                 ch->m_cts = 0x20 ;
1539                                 ch->m_ri  = 0x40 ;
1540                                 ch->m_dtr = 0x80 ;
1541                                 break;
1542         
1543                 } /* End switch bd->type */
1544
1545                 if (boards[crd].altpin) {
1546                         ch->dsr = ch->m_dcd;
1547                         ch->dcd = ch->m_dsr;
1548                         ch->digiext.digi_flags |= DIGI_ALTPIN;
1549                 }
1550                 else {
1551                         ch->dcd = ch->m_dcd;
1552                         ch->dsr = ch->m_dsr;
1553                 }
1554         
1555                 ch->boardnum   = crd;
1556                 ch->channelnum = i;
1557                 ch->magic      = EPCA_MAGIC;
1558                 ch->tty        = NULL;
1559
1560                 if (shrinkmem) {
1561                         fepcmd(ch, SETBUFFER, 32, 0, 0, 0);
1562                         shrinkmem = 0;
1563                 }
1564
1565                 tseg = readw(&bc->tseg);
1566                 rseg = readw(&bc->rseg);
1567
1568                 switch (bd->type) {
1569
1570                         case PCIXEM:
1571                         case PCIXRJ:
1572                         case PCIXR:
1573                                 /* Cover all the 2MEG cards */
1574                                 ch->txptr = memaddr + ((tseg << 4) & 0x1fffff);
1575                                 ch->rxptr = memaddr + ((rseg << 4) & 0x1fffff);
1576                                 ch->txwin = FEPWIN | (tseg >> 11);
1577                                 ch->rxwin = FEPWIN | (rseg >> 11);
1578                                 break;
1579
1580                         case PCXEM:
1581                         case EISAXEM:
1582                                 /* Cover all the 32K windowed cards */
1583                                 /* Mask equal to window size - 1 */
1584                                 ch->txptr = memaddr + ((tseg << 4) & 0x7fff);
1585                                 ch->rxptr = memaddr + ((rseg << 4) & 0x7fff);
1586                                 ch->txwin = FEPWIN | (tseg >> 11);
1587                                 ch->rxwin = FEPWIN | (rseg >> 11);
1588                                 break;
1589
1590                         case PCXEVE:
1591                         case PCXE:
1592                                 ch->txptr = memaddr + (((tseg - bd->memory_seg) << 4) & 0x1fff);
1593                                 ch->txwin = FEPWIN | ((tseg - bd->memory_seg) >> 9);
1594                                 ch->rxptr = memaddr + (((rseg - bd->memory_seg) << 4) & 0x1fff);
1595                                 ch->rxwin = FEPWIN | ((rseg - bd->memory_seg) >>9 );
1596                                 break;
1597
1598                         case PCXI:
1599                         case PC64XE:
1600                                 ch->txptr = memaddr + ((tseg - bd->memory_seg) << 4);
1601                                 ch->rxptr = memaddr + ((rseg - bd->memory_seg) << 4);
1602                                 ch->txwin = ch->rxwin = 0;
1603                                 break;
1604
1605                 } /* End switch bd->type */
1606
1607                 ch->txbufhead = 0;
1608                 ch->txbufsize = readw(&bc->tmax) + 1;
1609         
1610                 ch->rxbufhead = 0;
1611                 ch->rxbufsize = readw(&bc->rmax) + 1;
1612         
1613                 lowwater = ch->txbufsize >= 2000 ? 1024 : (ch->txbufsize / 2);
1614
1615                 /* Set transmitter low water mark */
1616                 fepcmd(ch, STXLWATER, lowwater, 0, 10, 0);
1617
1618                 /* Set receiver low water mark */
1619
1620                 fepcmd(ch, SRXLWATER, (ch->rxbufsize / 4), 0, 10, 0);
1621
1622                 /* Set receiver high water mark */
1623
1624                 fepcmd(ch, SRXHWATER, (3 * ch->rxbufsize / 4), 0, 10, 0);
1625
1626                 writew(100, &bc->edelay);
1627                 writeb(1, &bc->idata);
1628         
1629                 ch->startc  = readb(&bc->startc);
1630                 ch->stopc   = readb(&bc->stopc);
1631                 ch->startca = readb(&bc->startca);
1632                 ch->stopca  = readb(&bc->stopca);
1633         
1634                 ch->fepcflag = 0;
1635                 ch->fepiflag = 0;
1636                 ch->fepoflag = 0;
1637                 ch->fepstartc = 0;
1638                 ch->fepstopc = 0;
1639                 ch->fepstartca = 0;
1640                 ch->fepstopca = 0;
1641         
1642                 ch->close_delay = 50;
1643                 ch->count = 0;
1644                 ch->blocked_open = 0;
1645                 init_waitqueue_head(&ch->open_wait);
1646                 init_waitqueue_head(&ch->close_wait);
1647
1648                 spin_unlock_irqrestore(&epca_lock, flags);
1649         } /* End for each port */
1650
1651         printk(KERN_INFO 
1652                 "Digi PC/Xx Driver V%s:  %s I/O = 0x%lx Mem = 0x%lx Ports = %d\n", 
1653                 VERSION, board_desc[bd->type], (long)bd->port, (long)bd->membase, bd->numports);
1654         memwinoff(bd, 0);
1655
1656 } /* End post_fep_init */
1657
1658 /* --------------------- Begin epcapoll  ------------------------ */
1659
1660 static void epcapoll(unsigned long ignored)
1661 { /* Begin epcapoll */
1662
1663         unsigned long flags;
1664         int crd;
1665         volatile unsigned int head, tail;
1666         struct channel *ch;
1667         struct board_info *bd;
1668
1669         /* -------------------------------------------------------------------
1670                 This routine is called upon every timer interrupt.  Even though
1671                 the Digi series cards are capable of generating interrupts this 
1672                 method of non-looping polling is more efficient.  This routine
1673                 checks for card generated events (Such as receive data, are transmit
1674                 buffer empty) and acts on those events.
1675         ----------------------------------------------------------------------- */
1676         
1677         for (crd = 0; crd < num_cards; crd++) 
1678         { /* Begin for each card */
1679
1680                 bd = &boards[crd];
1681                 ch = card_ptr[crd];
1682
1683                 if ((bd->status == DISABLED) || digi_poller_inhibited)
1684                         continue; /* Begin loop next interation */
1685
1686                 /* -----------------------------------------------------------
1687                         assertmemoff is not needed here; indeed it is an empty subroutine.
1688                         It is being kept because future boards may need this as well as
1689                         some legacy boards.
1690                 ---------------------------------------------------------------- */
1691
1692                 spin_lock_irqsave(&epca_lock, flags);
1693
1694                 assertmemoff(ch);
1695
1696                 globalwinon(ch);
1697
1698                 /* ---------------------------------------------------------------
1699                         In this case head and tail actually refer to the event queue not
1700                         the transmit or receive queue.
1701                 ------------------------------------------------------------------- */
1702
1703                 head = readw(&ch->mailbox->ein);
1704                 tail = readw(&ch->mailbox->eout);
1705                 
1706                 /* If head isn't equal to tail we have an event */
1707
1708                 if (head != tail)
1709                         doevent(crd);
1710                 memoff(ch);
1711
1712                 spin_unlock_irqrestore(&epca_lock, flags);
1713
1714         } /* End for each card */
1715         mod_timer(&epca_timer, jiffies + (HZ / 25));
1716 } /* End epcapoll */
1717
1718 /* --------------------- Begin doevent  ------------------------ */
1719
1720 static void doevent(int crd)
1721 { /* Begin doevent */
1722
1723         void __iomem *eventbuf;
1724         struct channel *ch, *chan0;
1725         static struct tty_struct *tty;
1726         struct board_info *bd;
1727         struct board_chan __iomem *bc;
1728         unsigned int tail, head;
1729         int event, channel;
1730         int mstat, lstat;
1731
1732         /* -------------------------------------------------------------------
1733                 This subroutine is called by epcapoll when an event is detected 
1734                 in the event queue.  This routine responds to those events.
1735         --------------------------------------------------------------------- */
1736         bd = &boards[crd];
1737
1738         chan0 = card_ptr[crd];
1739         epcaassert(chan0 <= &digi_channels[nbdevs - 1], "ch out of range");
1740         assertgwinon(chan0);
1741         while ((tail = readw(&chan0->mailbox->eout)) != (head = readw(&chan0->mailbox->ein)))
1742         { /* Begin while something in event queue */
1743                 assertgwinon(chan0);
1744                 eventbuf = bd->re_map_membase + tail + ISTART;
1745                 /* Get the channel the event occurred on */
1746                 channel = readb(eventbuf);
1747                 /* Get the actual event code that occurred */
1748                 event = readb(eventbuf + 1);
1749                 /*  ----------------------------------------------------------------
1750                         The two assignments below get the current modem status (mstat)
1751                         and the previous modem status (lstat).  These are useful becuase
1752                         an event could signal a change in modem signals itself.
1753                 ------------------------------------------------------------------- */
1754                 mstat = readb(eventbuf + 2);
1755                 lstat = readb(eventbuf + 3);
1756
1757                 ch = chan0 + channel;
1758                 if ((unsigned)channel >= bd->numports || !ch)  {
1759                         if (channel >= bd->numports)
1760                                 ch = chan0;
1761                         bc = ch->brdchan;
1762                         goto next;
1763                 }
1764
1765                 if ((bc = ch->brdchan) == NULL)
1766                         goto next;
1767
1768                 if (event & DATA_IND)  { /* Begin DATA_IND */
1769                         receive_data(ch);
1770                         assertgwinon(ch);
1771                 } /* End DATA_IND */
1772                 /* else *//* Fix for DCD transition missed bug */
1773                 if (event & MODEMCHG_IND)  { /* Begin MODEMCHG_IND */
1774                         /* A modem signal change has been indicated */
1775                         ch->imodem = mstat;
1776                         if (ch->asyncflags & ASYNC_CHECK_CD)  {
1777                                 if (mstat & ch->dcd)  /* We are now receiving dcd */
1778                                         wake_up_interruptible(&ch->open_wait);
1779                                 else
1780                                         pc_sched_event(ch, EPCA_EVENT_HANGUP); /* No dcd; hangup */
1781                         }
1782                 } /* End MODEMCHG_IND */
1783                 tty = ch->tty;
1784                 if (tty)  { /* Begin if valid tty */
1785                         if (event & BREAK_IND)  { /* Begin if BREAK_IND */
1786                                 /* A break has been indicated */
1787                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
1788                                 tty_schedule_flip(tty); 
1789                         } else if (event & LOWTX_IND)  { /* Begin LOWTX_IND */
1790                                 if (ch->statusflags & LOWWAIT) 
1791                                 { /* Begin if LOWWAIT */
1792                                         ch->statusflags &= ~LOWWAIT;
1793                                         tty_wakeup(tty);
1794                                         wake_up_interruptible(&tty->write_wait);
1795                                 } /* End if LOWWAIT */
1796                         } else if (event & EMPTYTX_IND)  { /* Begin EMPTYTX_IND */
1797                                 /* This event is generated by setup_empty_event */
1798                                 ch->statusflags &= ~TXBUSY;
1799                                 if (ch->statusflags & EMPTYWAIT)  { /* Begin if EMPTYWAIT */
1800                                         ch->statusflags &= ~EMPTYWAIT;
1801                                         tty_wakeup(tty);
1802                                         wake_up_interruptible(&tty->write_wait);
1803                                 } /* End if EMPTYWAIT */
1804                         } /* End EMPTYTX_IND */
1805                 } /* End if valid tty */
1806         next:
1807                 globalwinon(ch);
1808                 BUG_ON(!bc);
1809                 writew(1, &bc->idata);
1810                 writew((tail + 4) & (IMAX - ISTART - 4), &chan0->mailbox->eout);
1811                 globalwinon(chan0);
1812         } /* End while something in event queue */
1813 } /* End doevent */
1814
1815 /* --------------------- Begin fepcmd  ------------------------ */
1816
1817 static void fepcmd(struct channel *ch, int cmd, int word_or_byte,
1818                    int byte2, int ncmds, int bytecmd)
1819 { /* Begin fepcmd */
1820         unchar __iomem *memaddr;
1821         unsigned int head, cmdTail, cmdStart, cmdMax;
1822         long count;
1823         int n;
1824
1825         /* This is the routine in which commands may be passed to the card. */
1826
1827         if (ch->board->status == DISABLED)
1828                 return;
1829         assertgwinon(ch);
1830         /* Remember head (As well as max) is just an offset not a base addr */
1831         head = readw(&ch->mailbox->cin);
1832         /* cmdStart is a base address */
1833         cmdStart = readw(&ch->mailbox->cstart);
1834         /* ------------------------------------------------------------------
1835                 We do the addition below because we do not want a max pointer 
1836                 relative to cmdStart.  We want a max pointer that points at the 
1837                 physical end of the command queue.
1838         -------------------------------------------------------------------- */
1839         cmdMax = (cmdStart + 4 + readw(&ch->mailbox->cmax));
1840         memaddr = ch->board->re_map_membase;
1841
1842         if (head >= (cmdMax - cmdStart) || (head & 03))  {
1843                 printk(KERN_ERR "line %d: Out of range, cmd = %x, head = %x\n", __LINE__,  cmd, head);
1844                 printk(KERN_ERR "line %d: Out of range, cmdMax = %x, cmdStart = %x\n", __LINE__,  cmdMax, cmdStart);
1845                 return;
1846         }
1847         if (bytecmd)  {
1848                 writeb(cmd, memaddr + head + cmdStart + 0);
1849                 writeb(ch->channelnum,  memaddr + head + cmdStart + 1);
1850                 /* Below word_or_byte is bits to set */
1851                 writeb(word_or_byte,  memaddr + head + cmdStart + 2);
1852                 /* Below byte2 is bits to reset */
1853                 writeb(byte2, memaddr + head + cmdStart + 3);
1854         }  else {
1855                 writeb(cmd, memaddr + head + cmdStart + 0);
1856                 writeb(ch->channelnum,  memaddr + head + cmdStart + 1);
1857                 writeb(word_or_byte,  memaddr + head + cmdStart + 2);
1858         }
1859         head = (head + 4) & (cmdMax - cmdStart - 4);
1860         writew(head, &ch->mailbox->cin);
1861         count = FEPTIMEOUT;
1862
1863         for (;;)  { /* Begin forever loop */
1864                 count--;
1865                 if (count == 0)  {
1866                         printk(KERN_ERR "<Error> - Fep not responding in fepcmd()\n");
1867                         return;
1868                 }
1869                 head = readw(&ch->mailbox->cin);
1870                 cmdTail = readw(&ch->mailbox->cout);
1871                 n = (head - cmdTail) & (cmdMax - cmdStart - 4);
1872                 /* ----------------------------------------------------------
1873                         Basically this will break when the FEP acknowledges the 
1874                         command by incrementing cmdTail (Making it equal to head).
1875                 ------------------------------------------------------------- */
1876                 if (n <= ncmds * (sizeof(short) * 4))
1877                         break; /* Well nearly forever :-) */
1878         } /* End forever loop */
1879 } /* End fepcmd */
1880
1881 /* ---------------------------------------------------------------------
1882         Digi products use fields in their channels structures that are very
1883         similar to the c_cflag and c_iflag fields typically found in UNIX
1884         termios structures.  The below three routines allow mappings 
1885         between these hardware "flags" and their respective Linux flags.
1886 ------------------------------------------------------------------------- */
1887  
1888 /* --------------------- Begin termios2digi_h -------------------- */
1889
1890 static unsigned termios2digi_h(struct channel *ch, unsigned cflag)
1891 { /* Begin termios2digi_h */
1892         unsigned res = 0;
1893
1894         if (cflag & CRTSCTS) {
1895                 ch->digiext.digi_flags |= (RTSPACE | CTSPACE);
1896                 res |= ((ch->m_cts) | (ch->m_rts));
1897         }
1898
1899         if (ch->digiext.digi_flags & RTSPACE)
1900                 res |= ch->m_rts;
1901
1902         if (ch->digiext.digi_flags & DTRPACE)
1903                 res |= ch->m_dtr;
1904
1905         if (ch->digiext.digi_flags & CTSPACE)
1906                 res |= ch->m_cts;
1907
1908         if (ch->digiext.digi_flags & DSRPACE)
1909                 res |= ch->dsr;
1910
1911         if (ch->digiext.digi_flags & DCDPACE)
1912                 res |= ch->dcd;
1913
1914         if (res & (ch->m_rts))
1915                 ch->digiext.digi_flags |= RTSPACE;
1916
1917         if (res & (ch->m_cts))
1918                 ch->digiext.digi_flags |= CTSPACE;
1919
1920         return res;
1921
1922 } /* End termios2digi_h */
1923
1924 /* --------------------- Begin termios2digi_i -------------------- */
1925 static unsigned termios2digi_i(struct channel *ch, unsigned iflag)
1926 { /* Begin termios2digi_i */
1927
1928         unsigned res = iflag & (IGNBRK | BRKINT | IGNPAR | PARMRK | 
1929                                 INPCK | ISTRIP|IXON|IXANY|IXOFF);
1930         if (ch->digiext.digi_flags & DIGI_AIXON)
1931                 res |= IAIXON;
1932         return res;
1933
1934 } /* End termios2digi_i */
1935
1936 /* --------------------- Begin termios2digi_c -------------------- */
1937
1938 static unsigned termios2digi_c(struct channel *ch, unsigned cflag)
1939 { /* Begin termios2digi_c */
1940
1941         unsigned res = 0;
1942         if (cflag & CBAUDEX) { /* Begin detected CBAUDEX */
1943                 ch->digiext.digi_flags |= DIGI_FAST;
1944                 /* -------------------------------------------------------------
1945                    HUPCL bit is used by FEP to indicate fast baud
1946                    table is to be used.
1947                 ----------------------------------------------------------------- */
1948                 res |= FEP_HUPCL;
1949         } /* End detected CBAUDEX */
1950         else ch->digiext.digi_flags &= ~DIGI_FAST; 
1951         /* -------------------------------------------------------------------
1952                 CBAUD has bit position 0x1000 set these days to indicate Linux
1953                 baud rate remap.  Digi hardware can't handle the bit assignment.
1954                 (We use a different bit assignment for high speed.).  Clear this
1955                 bit out.
1956         ---------------------------------------------------------------------- */
1957         res |= cflag & ((CBAUD ^ CBAUDEX) | PARODD | PARENB | CSTOPB | CSIZE);
1958         /* -------------------------------------------------------------
1959                 This gets a little confusing.  The Digi cards have their own
1960                 representation of c_cflags controling baud rate.  For the most
1961                 part this is identical to the Linux implementation.  However;
1962                 Digi supports one rate (76800) that Linux doesn't.  This means 
1963                 that the c_cflag entry that would normally mean 76800 for Digi
1964                 actually means 115200 under Linux.  Without the below mapping,
1965                 a stty 115200 would only drive the board at 76800.  Since 
1966                 the rate 230400 is also found after 76800, the same problem afflicts    
1967                 us when we choose a rate of 230400.  Without the below modificiation
1968                 stty 230400 would actually give us 115200.
1969
1970                 There are two additional differences.  The Linux value for CLOCAL
1971                 (0x800; 0004000) has no meaning to the Digi hardware.  Also in 
1972                 later releases of Linux; the CBAUD define has CBAUDEX (0x1000;
1973                 0010000) ored into it (CBAUD = 0x100f as opposed to 0xf). CBAUDEX
1974                 should be checked for a screened out prior to termios2digi_c 
1975                 returning.  Since CLOCAL isn't used by the board this can be
1976                 ignored as long as the returned value is used only by Digi hardware. 
1977                 ----------------------------------------------------------------- */
1978         if (cflag & CBAUDEX) {
1979                 /* -------------------------------------------------------------
1980                         The below code is trying to guarantee that only baud rates
1981                         115200 and 230400 are remapped.  We use exclusive or because
1982                         the various baud rates share common bit positions and therefore
1983                         can't be tested for easily.
1984                 ----------------------------------------------------------------- */
1985
1986                                 
1987                 if ((!((cflag & 0x7) ^ (B115200 & ~CBAUDEX))) || 
1988                     (!((cflag & 0x7) ^ (B230400 & ~CBAUDEX))))
1989                         res += 1;
1990         }
1991         return res;
1992
1993 } /* End termios2digi_c */
1994
1995 /* --------------------- Begin epcaparam  ----------------------- */
1996
1997 /* Caller must hold the locks */
1998 static void epcaparam(struct tty_struct *tty, struct channel *ch)
1999 { /* Begin epcaparam */
2000
2001         unsigned int cmdHead;
2002         struct termios *ts;
2003         struct board_chan __iomem *bc;
2004         unsigned mval, hflow, cflag, iflag;
2005
2006         bc = ch->brdchan;
2007         epcaassert(bc !=0, "bc out of range");
2008
2009         assertgwinon(ch);
2010         ts = tty->termios;
2011         if ((ts->c_cflag & CBAUD) == 0)  { /* Begin CBAUD detected */
2012                 cmdHead = readw(&bc->rin);
2013                 writew(cmdHead, &bc->rout);
2014                 cmdHead = readw(&bc->tin);
2015                 /* Changing baud in mid-stream transmission can be wonderful */
2016                 /* ---------------------------------------------------------------
2017                         Flush current transmit buffer by setting cmdTail pointer (tout)
2018                         to cmdHead pointer (tin).  Hopefully the transmit buffer is empty.
2019                 ----------------------------------------------------------------- */
2020                 fepcmd(ch, STOUT, (unsigned) cmdHead, 0, 0, 0);
2021                 mval = 0;
2022         } else  { /* Begin CBAUD not detected */
2023                 /* -------------------------------------------------------------------
2024                         c_cflags have changed but that change had nothing to do with BAUD.
2025                         Propagate the change to the card.
2026                 ---------------------------------------------------------------------- */ 
2027                 cflag = termios2digi_c(ch, ts->c_cflag);
2028                 if (cflag != ch->fepcflag)  {
2029                         ch->fepcflag = cflag;
2030                         /* Set baud rate, char size, stop bits, parity */
2031                         fepcmd(ch, SETCTRLFLAGS, (unsigned) cflag, 0, 0, 0);
2032                 }
2033                 /* ----------------------------------------------------------------
2034                         If the user has not forced CLOCAL and if the device is not a 
2035                         CALLOUT device (Which is always CLOCAL) we set flags such that
2036                         the driver will wait on carrier detect.
2037                 ------------------------------------------------------------------- */
2038                 if (ts->c_cflag & CLOCAL)
2039                         ch->asyncflags &= ~ASYNC_CHECK_CD;
2040                 else
2041                         ch->asyncflags |= ASYNC_CHECK_CD;
2042                 mval = ch->m_dtr | ch->m_rts;
2043         } /* End CBAUD not detected */
2044         iflag = termios2digi_i(ch, ts->c_iflag);
2045         /* Check input mode flags */
2046         if (iflag != ch->fepiflag)  {
2047                 ch->fepiflag = iflag;
2048                 /* ---------------------------------------------------------------
2049                         Command sets channels iflag structure on the board. Such things 
2050                         as input soft flow control, handling of parity errors, and
2051                         break handling are all set here.
2052                 ------------------------------------------------------------------- */
2053                 /* break handling, parity handling, input stripping, flow control chars */
2054                 fepcmd(ch, SETIFLAGS, (unsigned int) ch->fepiflag, 0, 0, 0);
2055         }
2056         /* ---------------------------------------------------------------
2057                 Set the board mint value for this channel.  This will cause hardware
2058                 events to be generated each time the DCD signal (Described in mint) 
2059                 changes.        
2060         ------------------------------------------------------------------- */
2061         writeb(ch->dcd, &bc->mint);
2062         if ((ts->c_cflag & CLOCAL) || (ch->digiext.digi_flags & DIGI_FORCEDCD))
2063                 if (ch->digiext.digi_flags & DIGI_FORCEDCD)
2064                         writeb(0, &bc->mint);
2065         ch->imodem = readb(&bc->mstat);
2066         hflow = termios2digi_h(ch, ts->c_cflag);
2067         if (hflow != ch->hflow)  {
2068                 ch->hflow = hflow;
2069                 /* --------------------------------------------------------------
2070                         Hard flow control has been selected but the board is not
2071                         using it.  Activate hard flow control now.
2072                 ----------------------------------------------------------------- */
2073                 fepcmd(ch, SETHFLOW, hflow, 0xff, 0, 1);
2074         }
2075         mval ^= ch->modemfake & (mval ^ ch->modem);
2076
2077         if (ch->omodem ^ mval)  {
2078                 ch->omodem = mval;
2079                 /* --------------------------------------------------------------
2080                         The below command sets the DTR and RTS mstat structure.  If
2081                         hard flow control is NOT active these changes will drive the
2082                         output of the actual DTR and RTS lines.  If hard flow control 
2083                         is active, the changes will be saved in the mstat structure and
2084                         only asserted when hard flow control is turned off. 
2085                 ----------------------------------------------------------------- */
2086
2087                 /* First reset DTR & RTS; then set them */
2088                 fepcmd(ch, SETMODEM, 0, ((ch->m_dtr)|(ch->m_rts)), 0, 1);
2089                 fepcmd(ch, SETMODEM, mval, 0, 0, 1);
2090         }
2091         if (ch->startc != ch->fepstartc || ch->stopc != ch->fepstopc)  {
2092                 ch->fepstartc = ch->startc;
2093                 ch->fepstopc = ch->stopc;
2094                 /* ------------------------------------------------------------
2095                         The XON / XOFF characters have changed; propagate these
2096                         changes to the card.    
2097                 --------------------------------------------------------------- */
2098                 fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
2099         }
2100         if (ch->startca != ch->fepstartca || ch->stopca != ch->fepstopca)  {
2101                 ch->fepstartca = ch->startca;
2102                 ch->fepstopca = ch->stopca;
2103                 /* ---------------------------------------------------------------
2104                         Similar to the above, this time the auxilarly XON / XOFF 
2105                         characters have changed; propagate these changes to the card.
2106                 ------------------------------------------------------------------ */
2107                 fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
2108         }
2109 } /* End epcaparam */
2110
2111 /* --------------------- Begin receive_data  ----------------------- */
2112 /* Caller holds lock */
2113 static void receive_data(struct channel *ch)
2114 { /* Begin receive_data */
2115
2116         unchar *rptr;
2117         struct termios *ts = NULL;
2118         struct tty_struct *tty;
2119         struct board_chan __iomem *bc;
2120         int dataToRead, wrapgap, bytesAvailable;
2121         unsigned int tail, head;
2122         unsigned int wrapmask;
2123
2124         /* ---------------------------------------------------------------
2125                 This routine is called by doint when a receive data event 
2126                 has taken place.
2127         ------------------------------------------------------------------- */
2128
2129         globalwinon(ch);
2130         if (ch->statusflags & RXSTOPPED)
2131                 return;
2132         tty = ch->tty;
2133         if (tty)
2134                 ts = tty->termios;
2135         bc = ch->brdchan;
2136         BUG_ON(!bc);
2137         wrapmask = ch->rxbufsize - 1;
2138
2139         /* --------------------------------------------------------------------- 
2140                 Get the head and tail pointers to the receiver queue.  Wrap the 
2141                 head pointer if it has reached the end of the buffer.
2142         ------------------------------------------------------------------------ */
2143         head = readw(&bc->rin);
2144         head &= wrapmask;
2145         tail = readw(&bc->rout) & wrapmask;
2146
2147         bytesAvailable = (head - tail) & wrapmask;
2148         if (bytesAvailable == 0)
2149                 return;
2150
2151         /* ------------------------------------------------------------------
2152            If CREAD bit is off or device not open, set TX tail to head
2153         --------------------------------------------------------------------- */
2154
2155         if (!tty || !ts || !(ts->c_cflag & CREAD))  {
2156                 writew(head, &bc->rout);
2157                 return;
2158         }
2159
2160         if (tty_buffer_request_room(tty, bytesAvailable + 1) == 0)
2161                 return;
2162
2163         if (readb(&bc->orun)) {
2164                 writeb(0, &bc->orun);
2165                 printk(KERN_WARNING "epca; overrun! DigiBoard device %s\n",tty->name);
2166                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2167         }
2168         rxwinon(ch);
2169         while (bytesAvailable > 0)  { /* Begin while there is data on the card */
2170                 wrapgap = (head >= tail) ? head - tail : ch->rxbufsize - tail;
2171                 /* ---------------------------------------------------------------
2172                         Even if head has wrapped around only report the amount of
2173                         data to be equal to the size - tail.  Remember memcpy can't
2174                         automaticly wrap around the receive buffer.
2175                 ----------------------------------------------------------------- */
2176                 dataToRead = (wrapgap < bytesAvailable) ? wrapgap : bytesAvailable;
2177                 /* --------------------------------------------------------------
2178                    Make sure we don't overflow the buffer
2179                 ----------------------------------------------------------------- */
2180                 dataToRead = tty_prepare_flip_string(tty, &rptr, dataToRead);
2181                 if (dataToRead == 0)
2182                         break;
2183                 /* ---------------------------------------------------------------
2184                         Move data read from our card into the line disciplines buffer
2185                         for translation if necessary.
2186                 ------------------------------------------------------------------ */
2187                 memcpy_fromio(rptr, ch->rxptr + tail, dataToRead);
2188                 tail = (tail + dataToRead) & wrapmask;
2189                 bytesAvailable -= dataToRead;
2190         } /* End while there is data on the card */
2191         globalwinon(ch);
2192         writew(tail, &bc->rout);
2193         /* Must be called with global data */
2194         tty_schedule_flip(ch->tty); 
2195         return;
2196 } /* End receive_data */
2197
2198 static int info_ioctl(struct tty_struct *tty, struct file * file,
2199                     unsigned int cmd, unsigned long arg)
2200 {
2201         switch (cmd) 
2202         { /* Begin switch cmd */
2203                 case DIGI_GETINFO:
2204                 { /* Begin case DIGI_GETINFO */
2205                         struct digi_info di ;
2206                         int brd;
2207
2208                         if(get_user(brd, (unsigned int __user *)arg))
2209                                 return -EFAULT;
2210                         if (brd < 0 || brd >= num_cards || num_cards == 0)
2211                                 return -ENODEV;
2212
2213                         memset(&di, 0, sizeof(di));
2214
2215                         di.board = brd ; 
2216                         di.status = boards[brd].status;
2217                         di.type = boards[brd].type ;
2218                         di.numports = boards[brd].numports ;
2219                         /* Legacy fixups - just move along nothing to see */
2220                         di.port = (unsigned char *)boards[brd].port ;
2221                         di.membase = (unsigned char *)boards[brd].membase ;
2222
2223                         if (copy_to_user((void __user *)arg, &di, sizeof (di)))
2224                                 return -EFAULT;
2225                         break;
2226
2227                 } /* End case DIGI_GETINFO */
2228
2229                 case DIGI_POLLER:
2230                 { /* Begin case DIGI_POLLER */
2231
2232                         int brd = arg & 0xff000000 >> 16 ; 
2233                         unsigned char state = arg & 0xff ; 
2234
2235                         if (brd < 0 || brd >= num_cards) {
2236                                 printk(KERN_ERR "epca: DIGI POLLER : brd not valid!\n");
2237                                 return (-ENODEV);
2238                         }
2239                         digi_poller_inhibited = state ;
2240                         break ; 
2241                 } /* End case DIGI_POLLER */
2242
2243                 case DIGI_INIT:
2244                 { /* Begin case DIGI_INIT */
2245                         /* ------------------------------------------------------------
2246                                 This call is made by the apps to complete the initilization
2247                                 of the board(s).  This routine is responsible for setting
2248                                 the card to its initial state and setting the drivers control
2249                                 fields to the sutianle settings for the card in question.
2250                         ---------------------------------------------------------------- */
2251                         int crd ; 
2252                         for (crd = 0; crd < num_cards; crd++) 
2253                                 post_fep_init (crd);
2254                         break ; 
2255                 } /* End case DIGI_INIT */
2256                 default:
2257                         return -ENOTTY;
2258         } /* End switch cmd */
2259         return (0) ;
2260 }
2261 /* --------------------- Begin pc_ioctl  ----------------------- */
2262
2263 static int pc_tiocmget(struct tty_struct *tty, struct file *file)
2264 {
2265         struct channel *ch = (struct channel *) tty->driver_data;
2266         struct board_chan __iomem *bc;
2267         unsigned int mstat, mflag = 0;
2268         unsigned long flags;
2269
2270         if (ch)
2271                 bc = ch->brdchan;
2272         else
2273                 return -EINVAL;
2274
2275         spin_lock_irqsave(&epca_lock, flags);
2276         globalwinon(ch);
2277         mstat = readb(&bc->mstat);
2278         memoff(ch);
2279         spin_unlock_irqrestore(&epca_lock, flags);
2280
2281         if (mstat & ch->m_dtr)
2282                 mflag |= TIOCM_DTR;
2283         if (mstat & ch->m_rts)
2284                 mflag |= TIOCM_RTS;
2285         if (mstat & ch->m_cts)
2286                 mflag |= TIOCM_CTS;
2287         if (mstat & ch->dsr)
2288                 mflag |= TIOCM_DSR;
2289         if (mstat & ch->m_ri)
2290                 mflag |= TIOCM_RI;
2291         if (mstat & ch->dcd)
2292                 mflag |= TIOCM_CD;
2293         return mflag;
2294 }
2295
2296 static int pc_tiocmset(struct tty_struct *tty, struct file *file,
2297                        unsigned int set, unsigned int clear)
2298 {
2299         struct channel *ch = (struct channel *) tty->driver_data;
2300         unsigned long flags;
2301
2302         if (!ch)
2303                 return -EINVAL;
2304
2305         spin_lock_irqsave(&epca_lock, flags);
2306         /*
2307          * I think this modemfake stuff is broken.  It doesn't
2308          * correctly reflect the behaviour desired by the TIOCM*
2309          * ioctls.  Therefore this is probably broken.
2310          */
2311         if (set & TIOCM_RTS) {
2312                 ch->modemfake |= ch->m_rts;
2313                 ch->modem |= ch->m_rts;
2314         }
2315         if (set & TIOCM_DTR) {
2316                 ch->modemfake |= ch->m_dtr;
2317                 ch->modem |= ch->m_dtr;
2318         }
2319         if (clear & TIOCM_RTS) {
2320                 ch->modemfake |= ch->m_rts;
2321                 ch->modem &= ~ch->m_rts;
2322         }
2323         if (clear & TIOCM_DTR) {
2324                 ch->modemfake |= ch->m_dtr;
2325                 ch->modem &= ~ch->m_dtr;
2326         }
2327         globalwinon(ch);
2328         /*  --------------------------------------------------------------
2329                 The below routine generally sets up parity, baud, flow control
2330                 issues, etc.... It effect both control flags and input flags.
2331         ------------------------------------------------------------------ */
2332         epcaparam(tty,ch);
2333         memoff(ch);
2334         spin_unlock_irqrestore(&epca_lock, flags);
2335         return 0;
2336 }
2337
2338 static int pc_ioctl(struct tty_struct *tty, struct file * file,
2339                     unsigned int cmd, unsigned long arg)
2340 { /* Begin pc_ioctl */
2341
2342         digiflow_t dflow;
2343         int retval;
2344         unsigned long flags;
2345         unsigned int mflag, mstat;
2346         unsigned char startc, stopc;
2347         struct board_chan __iomem *bc;
2348         struct channel *ch = (struct channel *) tty->driver_data;
2349         void __user *argp = (void __user *)arg;
2350         
2351         if (ch)
2352                 bc = ch->brdchan;
2353         else 
2354                 return -EINVAL;
2355
2356         /* -------------------------------------------------------------------
2357                 For POSIX compliance we need to add more ioctls.  See tty_ioctl.c
2358                 in /usr/src/linux/drivers/char for a good example.  In particular 
2359                 think about adding TCSETAF, TCSETAW, TCSETA, TCSETSF, TCSETSW, TCSETS.
2360         ---------------------------------------------------------------------- */
2361
2362         switch (cmd) 
2363         { /* Begin switch cmd */
2364
2365                 case TCGETS:
2366                         if (copy_to_user(argp, tty->termios, sizeof(struct termios)))
2367                                 return -EFAULT;
2368                         return 0;
2369                 case TCGETA:
2370                         return get_termio(tty, argp);
2371                 case TCSBRK:    /* SVID version: non-zero arg --> no break */
2372                         retval = tty_check_change(tty);
2373                         if (retval)
2374                                 return retval;
2375                         /* Setup an event to indicate when the transmit buffer empties */
2376                         spin_lock_irqsave(&epca_lock, flags);
2377                         setup_empty_event(tty,ch);              
2378                         spin_unlock_irqrestore(&epca_lock, flags);
2379                         tty_wait_until_sent(tty, 0);
2380                         if (!arg)
2381                                 digi_send_break(ch, HZ/4);    /* 1/4 second */
2382                         return 0;
2383                 case TCSBRKP:   /* support for POSIX tcsendbreak() */
2384                         retval = tty_check_change(tty);
2385                         if (retval)
2386                                 return retval;
2387
2388                         /* Setup an event to indicate when the transmit buffer empties */
2389                         spin_lock_irqsave(&epca_lock, flags);
2390                         setup_empty_event(tty,ch);              
2391                         spin_unlock_irqrestore(&epca_lock, flags);
2392                         tty_wait_until_sent(tty, 0);
2393                         digi_send_break(ch, arg ? arg*(HZ/10) : HZ/4);
2394                         return 0;
2395                 case TIOCGSOFTCAR:
2396                         if (put_user(C_CLOCAL(tty)?1:0, (unsigned long __user *)arg))
2397                                 return -EFAULT;
2398                         return 0;
2399                 case TIOCSSOFTCAR:
2400                 {
2401                         unsigned int value;
2402
2403                         if (get_user(value, (unsigned __user *)argp))
2404                                 return -EFAULT;
2405                         tty->termios->c_cflag =
2406                                 ((tty->termios->c_cflag & ~CLOCAL) |
2407                                  (value ? CLOCAL : 0));
2408                         return 0;
2409                 }
2410                 case TIOCMODG:
2411                         mflag = pc_tiocmget(tty, file);
2412                         if (put_user(mflag, (unsigned long __user *)argp))
2413                                 return -EFAULT;
2414                         break;
2415                 case TIOCMODS:
2416                         if (get_user(mstat, (unsigned __user *)argp))
2417                                 return -EFAULT;
2418                         return pc_tiocmset(tty, file, mstat, ~mstat);
2419                 case TIOCSDTR:
2420                         spin_lock_irqsave(&epca_lock, flags);
2421                         ch->omodem |= ch->m_dtr;
2422                         globalwinon(ch);
2423                         fepcmd(ch, SETMODEM, ch->m_dtr, 0, 10, 1);
2424                         memoff(ch);
2425                         spin_unlock_irqrestore(&epca_lock, flags);
2426                         break;
2427
2428                 case TIOCCDTR:
2429                         spin_lock_irqsave(&epca_lock, flags);
2430                         ch->omodem &= ~ch->m_dtr;
2431                         globalwinon(ch);
2432                         fepcmd(ch, SETMODEM, 0, ch->m_dtr, 10, 1);
2433                         memoff(ch);
2434                         spin_unlock_irqrestore(&epca_lock, flags);
2435                         break;
2436                 case DIGI_GETA:
2437                         if (copy_to_user(argp, &ch->digiext, sizeof(digi_t)))
2438                                 return -EFAULT;
2439                         break;
2440                 case DIGI_SETAW:
2441                 case DIGI_SETAF:
2442                         if (cmd == DIGI_SETAW) {
2443                                 /* Setup an event to indicate when the transmit buffer empties */
2444                                 spin_lock_irqsave(&epca_lock, flags);
2445                                 setup_empty_event(tty,ch);              
2446                                 spin_unlock_irqrestore(&epca_lock, flags);
2447                                 tty_wait_until_sent(tty, 0);
2448                         } else  {
2449                                 /* ldisc lock already held in ioctl */
2450                                 if (tty->ldisc.flush_buffer)
2451                                         tty->ldisc.flush_buffer(tty);
2452                         }
2453                         /* Fall Thru */
2454                 case DIGI_SETA:
2455                         if (copy_from_user(&ch->digiext, argp, sizeof(digi_t)))
2456                                 return -EFAULT;
2457                         
2458                         if (ch->digiext.digi_flags & DIGI_ALTPIN)  {
2459                                 ch->dcd = ch->m_dsr;
2460                                 ch->dsr = ch->m_dcd;
2461                         } else {
2462                                 ch->dcd = ch->m_dcd;
2463                                 ch->dsr = ch->m_dsr;
2464                         }
2465                 
2466                         spin_lock_irqsave(&epca_lock, flags);
2467                         globalwinon(ch);
2468
2469                         /* -----------------------------------------------------------------
2470                                 The below routine generally sets up parity, baud, flow control 
2471                                 issues, etc.... It effect both control flags and input flags.
2472                         ------------------------------------------------------------------- */
2473
2474                         epcaparam(tty,ch);
2475                         memoff(ch);
2476                         spin_unlock_irqrestore(&epca_lock, flags);
2477                         break;
2478
2479                 case DIGI_GETFLOW:
2480                 case DIGI_GETAFLOW:
2481                         spin_lock_irqsave(&epca_lock, flags);
2482                         globalwinon(ch);
2483                         if (cmd == DIGI_GETFLOW) {
2484                                 dflow.startc = readb(&bc->startc);
2485                                 dflow.stopc = readb(&bc->stopc);
2486                         } else {
2487                                 dflow.startc = readb(&bc->startca);
2488                                 dflow.stopc = readb(&bc->stopca);
2489                         }
2490                         memoff(ch);
2491                         spin_unlock_irqrestore(&epca_lock, flags);
2492
2493                         if (copy_to_user(argp, &dflow, sizeof(dflow)))
2494                                 return -EFAULT;
2495                         break;
2496
2497                 case DIGI_SETAFLOW:
2498                 case DIGI_SETFLOW:
2499                         if (cmd == DIGI_SETFLOW) {
2500                                 startc = ch->startc;
2501                                 stopc = ch->stopc;
2502                         } else {
2503                                 startc = ch->startca;
2504                                 stopc = ch->stopca;
2505                         }
2506
2507                         if (copy_from_user(&dflow, argp, sizeof(dflow)))
2508                                 return -EFAULT;
2509
2510                         if (dflow.startc != startc || dflow.stopc != stopc) { /* Begin  if setflow toggled */
2511                                 spin_lock_irqsave(&epca_lock, flags);
2512                                 globalwinon(ch);
2513
2514                                 if (cmd == DIGI_SETFLOW) {
2515                                         ch->fepstartc = ch->startc = dflow.startc;
2516                                         ch->fepstopc = ch->stopc = dflow.stopc;
2517                                         fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
2518                                 } else {
2519                                         ch->fepstartca = ch->startca = dflow.startc;
2520                                         ch->fepstopca  = ch->stopca = dflow.stopc;
2521                                         fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
2522                                 }
2523
2524                                 if (ch->statusflags & TXSTOPPED)
2525                                         pc_start(tty);
2526
2527                                 memoff(ch);
2528                                 spin_unlock_irqrestore(&epca_lock, flags);
2529                         } /* End if setflow toggled */
2530                         break;
2531                 default:
2532                         return -ENOIOCTLCMD;
2533         } /* End switch cmd */
2534         return 0;
2535 } /* End pc_ioctl */
2536
2537 /* --------------------- Begin pc_set_termios  ----------------------- */
2538
2539 static void pc_set_termios(struct tty_struct *tty, struct termios *old_termios)
2540 { /* Begin pc_set_termios */
2541
2542         struct channel *ch;
2543         unsigned long flags;
2544         /* ---------------------------------------------------------
2545                 verifyChannel returns the channel from the tty struct
2546                 if it is valid.  This serves as a sanity check.
2547         ------------------------------------------------------------- */
2548         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if channel valid */
2549                 spin_lock_irqsave(&epca_lock, flags);
2550                 globalwinon(ch);
2551                 epcaparam(tty, ch);
2552                 memoff(ch);
2553                 spin_unlock_irqrestore(&epca_lock, flags);
2554
2555                 if ((old_termios->c_cflag & CRTSCTS) &&
2556                          ((tty->termios->c_cflag & CRTSCTS) == 0))
2557                         tty->hw_stopped = 0;
2558
2559                 if (!(old_termios->c_cflag & CLOCAL) &&
2560                          (tty->termios->c_cflag & CLOCAL))
2561                         wake_up_interruptible(&ch->open_wait);
2562
2563         } /* End if channel valid */
2564
2565 } /* End pc_set_termios */
2566
2567 /* --------------------- Begin do_softint  ----------------------- */
2568
2569 static void do_softint(void *private_)
2570 { /* Begin do_softint */
2571         struct channel *ch = (struct channel *) private_;
2572         /* Called in response to a modem change event */
2573         if (ch && ch->magic == EPCA_MAGIC)  { /* Begin EPCA_MAGIC */
2574                 struct tty_struct *tty = ch->tty;
2575
2576                 if (tty && tty->driver_data) {
2577                         if (test_and_clear_bit(EPCA_EVENT_HANGUP, &ch->event)) { /* Begin if clear_bit */
2578                                 tty_hangup(tty);        /* FIXME: module removal race here - AKPM */
2579                                 wake_up_interruptible(&ch->open_wait);
2580                                 ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE;
2581                         } /* End if clear_bit */
2582                 }
2583         } /* End EPCA_MAGIC */
2584 } /* End do_softint */
2585
2586 /* ------------------------------------------------------------
2587         pc_stop and pc_start provide software flow control to the 
2588         routine and the pc_ioctl routine.
2589 ---------------------------------------------------------------- */
2590
2591 /* --------------------- Begin pc_stop  ----------------------- */
2592
2593 static void pc_stop(struct tty_struct *tty)
2594 { /* Begin pc_stop */
2595
2596         struct channel *ch;
2597         unsigned long flags;
2598         /* ---------------------------------------------------------
2599                 verifyChannel returns the channel from the tty struct
2600                 if it is valid.  This serves as a sanity check.
2601         ------------------------------------------------------------- */
2602         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if valid channel */
2603                 spin_lock_irqsave(&epca_lock, flags);
2604                 if ((ch->statusflags & TXSTOPPED) == 0)  { /* Begin if transmit stop requested */
2605                         globalwinon(ch);
2606                         /* STOP transmitting now !! */
2607                         fepcmd(ch, PAUSETX, 0, 0, 0, 0);
2608                         ch->statusflags |= TXSTOPPED;
2609                         memoff(ch);
2610                 } /* End if transmit stop requested */
2611                 spin_unlock_irqrestore(&epca_lock, flags);
2612         } /* End if valid channel */
2613 } /* End pc_stop */
2614
2615 /* --------------------- Begin pc_start  ----------------------- */
2616
2617 static void pc_start(struct tty_struct *tty)
2618 { /* Begin pc_start */
2619         struct channel *ch;
2620         /* ---------------------------------------------------------
2621                 verifyChannel returns the channel from the tty struct
2622                 if it is valid.  This serves as a sanity check.
2623         ------------------------------------------------------------- */
2624         if ((ch = verifyChannel(tty)) != NULL) { /* Begin if channel valid */
2625                 unsigned long flags;
2626                 spin_lock_irqsave(&epca_lock, flags);
2627                 /* Just in case output was resumed because of a change in Digi-flow */
2628                 if (ch->statusflags & TXSTOPPED)  { /* Begin transmit resume requested */
2629                         struct board_chan __iomem *bc;
2630                         globalwinon(ch);
2631                         bc = ch->brdchan;
2632                         if (ch->statusflags & LOWWAIT)
2633                                 writeb(1, &bc->ilow);
2634                         /* Okay, you can start transmitting again... */
2635                         fepcmd(ch, RESUMETX, 0, 0, 0, 0);
2636                         ch->statusflags &= ~TXSTOPPED;
2637                         memoff(ch);
2638                 } /* End transmit resume requested */
2639                 spin_unlock_irqrestore(&epca_lock, flags);
2640         } /* End if channel valid */
2641 } /* End pc_start */
2642
2643 /* ------------------------------------------------------------------
2644         The below routines pc_throttle and pc_unthrottle are used 
2645         to slow (And resume) the receipt of data into the kernels
2646         receive buffers.  The exact occurrence of this depends on the
2647         size of the kernels receive buffer and what the 'watermarks'
2648         are set to for that buffer.  See the n_ttys.c file for more
2649         details. 
2650 ______________________________________________________________________ */
2651 /* --------------------- Begin throttle  ----------------------- */
2652
2653 static void pc_throttle(struct tty_struct * tty)
2654 { /* Begin pc_throttle */
2655         struct channel *ch;
2656         unsigned long flags;
2657         /* ---------------------------------------------------------
2658                 verifyChannel returns the channel from the tty struct
2659                 if it is valid.  This serves as a sanity check.
2660         ------------------------------------------------------------- */
2661         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if channel valid */
2662                 spin_lock_irqsave(&epca_lock, flags);
2663                 if ((ch->statusflags & RXSTOPPED) == 0) {
2664                         globalwinon(ch);
2665                         fepcmd(ch, PAUSERX, 0, 0, 0, 0);
2666                         ch->statusflags |= RXSTOPPED;
2667                         memoff(ch);
2668                 }
2669                 spin_unlock_irqrestore(&epca_lock, flags);
2670         } /* End if channel valid */
2671 } /* End pc_throttle */
2672
2673 /* --------------------- Begin unthrottle  ----------------------- */
2674
2675 static void pc_unthrottle(struct tty_struct *tty)
2676 { /* Begin pc_unthrottle */
2677         struct channel *ch;
2678         unsigned long flags;
2679         /* ---------------------------------------------------------
2680                 verifyChannel returns the channel from the tty struct
2681                 if it is valid.  This serves as a sanity check.
2682         ------------------------------------------------------------- */
2683         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if channel valid */
2684                 /* Just in case output was resumed because of a change in Digi-flow */
2685                 spin_lock_irqsave(&epca_lock, flags);
2686                 if (ch->statusflags & RXSTOPPED) {
2687                         globalwinon(ch);
2688                         fepcmd(ch, RESUMERX, 0, 0, 0, 0);
2689                         ch->statusflags &= ~RXSTOPPED;
2690                         memoff(ch);
2691                 }
2692                 spin_unlock_irqrestore(&epca_lock, flags);
2693         } /* End if channel valid */
2694 } /* End pc_unthrottle */
2695
2696 /* --------------------- Begin digi_send_break  ----------------------- */
2697
2698 void digi_send_break(struct channel *ch, int msec)
2699 { /* Begin digi_send_break */
2700         unsigned long flags;
2701
2702         spin_lock_irqsave(&epca_lock, flags);
2703         globalwinon(ch);
2704         /* -------------------------------------------------------------------- 
2705            Maybe I should send an infinite break here, schedule() for
2706            msec amount of time, and then stop the break.  This way,
2707            the user can't screw up the FEP by causing digi_send_break()
2708            to be called (i.e. via an ioctl()) more than once in msec amount 
2709            of time.  Try this for now...
2710         ------------------------------------------------------------------------ */
2711         fepcmd(ch, SENDBREAK, msec, 0, 10, 0);
2712         memoff(ch);
2713         spin_unlock_irqrestore(&epca_lock, flags);
2714 } /* End digi_send_break */
2715
2716 /* --------------------- Begin setup_empty_event  ----------------------- */
2717
2718 /* Caller MUST hold the lock */
2719
2720 static void setup_empty_event(struct tty_struct *tty, struct channel *ch)
2721 { /* Begin setup_empty_event */
2722
2723         struct board_chan __iomem *bc = ch->brdchan;
2724
2725         globalwinon(ch);
2726         ch->statusflags |= EMPTYWAIT;
2727         /* ------------------------------------------------------------------
2728                 When set the iempty flag request a event to be generated when the 
2729                 transmit buffer is empty (If there is no BREAK in progress).
2730         --------------------------------------------------------------------- */
2731         writeb(1, &bc->iempty);
2732         memoff(ch);
2733 } /* End setup_empty_event */
2734
2735 /* --------------------- Begin get_termio ----------------------- */
2736
2737 static int get_termio(struct tty_struct * tty, struct termio __user * termio)
2738 { /* Begin get_termio */
2739         return kernel_termios_to_user_termio(termio, tty->termios);
2740 } /* End get_termio */
2741
2742 /* ---------------------- Begin epca_setup  -------------------------- */
2743 void epca_setup(char *str, int *ints)
2744 { /* Begin epca_setup */
2745         struct board_info board;
2746         int               index, loop, last;
2747         char              *temp, *t2;
2748         unsigned          len;
2749
2750         /* ----------------------------------------------------------------------
2751                 If this routine looks a little strange it is because it is only called
2752                 if a LILO append command is given to boot the kernel with parameters.  
2753                 In this way, we can provide the user a method of changing his board
2754                 configuration without rebuilding the kernel.
2755         ----------------------------------------------------------------------- */
2756         if (!liloconfig) 
2757                 liloconfig = 1; 
2758
2759         memset(&board, 0, sizeof(board));
2760
2761         /* Assume the data is int first, later we can change it */
2762         /* I think that array position 0 of ints holds the number of args */
2763         for (last = 0, index = 1; index <= ints[0]; index++)
2764                 switch(index)
2765                 { /* Begin parse switch */
2766                         case 1:
2767                                 board.status = ints[index];
2768                                 /* ---------------------------------------------------------
2769                                         We check for 2 (As opposed to 1; because 2 is a flag
2770                                         instructing the driver to ignore epcaconfig.)  For this
2771                                         reason we check for 2.
2772                                 ------------------------------------------------------------ */ 
2773                                 if (board.status == 2) { /* Begin ignore epcaconfig as well as lilo cmd line */
2774                                         nbdevs = 0;
2775                                         num_cards = 0;
2776                                         return;
2777                                 } /* End ignore epcaconfig as well as lilo cmd line */
2778         
2779                                 if (board.status > 2) {
2780                                         printk(KERN_ERR "epca_setup: Invalid board status 0x%x\n", board.status);
2781                                         invalid_lilo_config = 1;
2782                                         setup_error_code |= INVALID_BOARD_STATUS;
2783                                         return;
2784                                 }
2785                                 last = index;
2786                                 break;
2787                         case 2:
2788                                 board.type = ints[index];
2789                                 if (board.type >= PCIXEM)  {
2790                                         printk(KERN_ERR "epca_setup: Invalid board type 0x%x\n", board.type);
2791                                         invalid_lilo_config = 1;
2792                                         setup_error_code |= INVALID_BOARD_TYPE;
2793                                         return;
2794                                 }
2795                                 last = index;
2796                                 break;
2797                         case 3:
2798                                 board.altpin = ints[index];
2799                                 if (board.altpin > 1) {
2800                                         printk(KERN_ERR "epca_setup: Invalid board altpin 0x%x\n", board.altpin);
2801                                         invalid_lilo_config = 1;
2802                                         setup_error_code |= INVALID_ALTPIN;
2803                                         return;
2804                                 }
2805                                 last = index;
2806                                 break;
2807
2808                         case 4:
2809                                 board.numports = ints[index];
2810                                 if (board.numports < 2 || board.numports > 256) {
2811                                         printk(KERN_ERR "epca_setup: Invalid board numports 0x%x\n", board.numports);
2812                                         invalid_lilo_config = 1;
2813                                         setup_error_code |= INVALID_NUM_PORTS;
2814                                         return;
2815                                 }
2816                                 nbdevs += board.numports;
2817                                 last = index;
2818                                 break;
2819
2820                         case 5:
2821                                 board.port = ints[index];
2822                                 if (ints[index] <= 0) {
2823                                         printk(KERN_ERR "epca_setup: Invalid io port 0x%x\n", (unsigned int)board.port);
2824                                         invalid_lilo_config = 1;
2825                                         setup_error_code |= INVALID_PORT_BASE;
2826                                         return;
2827                                 }
2828                                 last = index;
2829                                 break;
2830
2831                         case 6:
2832                                 board.membase = ints[index];
2833                                 if (ints[index] <= 0) {
2834                                         printk(KERN_ERR "epca_setup: Invalid memory base 0x%x\n",(unsigned int)board.membase);
2835                                         invalid_lilo_config = 1;
2836                                         setup_error_code |= INVALID_MEM_BASE;
2837                                         return;
2838                                 }
2839                                 last = index;
2840                                 break;
2841
2842                         default:
2843                                 printk(KERN_ERR "<Error> - epca_setup: Too many integer parms\n");
2844                                 return;
2845
2846                 } /* End parse switch */
2847
2848         while (str && *str)  { /* Begin while there is a string arg */
2849                 /* find the next comma or terminator */
2850                 temp = str;
2851                 /* While string is not null, and a comma hasn't been found */
2852                 while (*temp && (*temp != ','))
2853                         temp++;
2854                 if (!*temp)
2855                         temp = NULL;
2856                 else
2857                         *temp++ = 0;
2858                 /* Set index to the number of args + 1 */
2859                 index = last + 1;
2860
2861                 switch(index)
2862                 {
2863                         case 1:
2864                                 len = strlen(str);
2865                                 if (strncmp("Disable", str, len) == 0) 
2866                                         board.status = 0;
2867                                 else if (strncmp("Enable", str, len) == 0)
2868                                         board.status = 1;
2869                                 else {
2870                                         printk(KERN_ERR "epca_setup: Invalid status %s\n", str);
2871                                         invalid_lilo_config = 1;
2872                                         setup_error_code |= INVALID_BOARD_STATUS;
2873                                         return;
2874                                 }
2875                                 last = index;
2876                                 break;
2877
2878                         case 2:
2879                                 for(loop = 0; loop < EPCA_NUM_TYPES; loop++)
2880                                         if (strcmp(board_desc[loop], str) == 0)
2881                                                 break;
2882                                 /* ---------------------------------------------------------------
2883                                         If the index incremented above refers to a legitamate board 
2884                                         type set it here. 
2885                                 ------------------------------------------------------------------*/
2886                                 if (index < EPCA_NUM_TYPES) 
2887                                         board.type = loop;
2888                                 else {
2889                                         printk(KERN_ERR "epca_setup: Invalid board type: %s\n", str);
2890                                         invalid_lilo_config = 1;
2891                                         setup_error_code |= INVALID_BOARD_TYPE;
2892                                         return;
2893                                 }
2894                                 last = index;
2895                                 break;
2896
2897                         case 3:
2898                                 len = strlen(str);
2899                                 if (strncmp("Disable", str, len) == 0) 
2900                                         board.altpin = 0;
2901                                 else if (strncmp("Enable", str, len) == 0)
2902                                         board.altpin = 1;
2903                                 else {
2904                                         printk(KERN_ERR "epca_setup: Invalid altpin %s\n", str);
2905                                         invalid_lilo_config = 1;
2906                                         setup_error_code |= INVALID_ALTPIN;
2907                                         return;
2908                                 }
2909                                 last = index;
2910                                 break;
2911
2912                         case 4:
2913                                 t2 = str;
2914                                 while (isdigit(*t2))
2915                                         t2++;
2916
2917                                 if (*t2) {
2918                                         printk(KERN_ERR "epca_setup: Invalid port count %s\n", str);
2919                                         invalid_lilo_config = 1;
2920                                         setup_error_code |= INVALID_NUM_PORTS;
2921                                         return;
2922                                 }
2923
2924                                 /* ------------------------------------------------------------
2925                                         There is not a man page for simple_strtoul but the code can be 
2926                                         found in vsprintf.c.  The first argument is the string to 
2927                                         translate (To an unsigned long obviously),  the second argument
2928                                         can be the address of any character variable or a NULL.  If a
2929                                         variable is given, the end pointer of the string will be stored 
2930                                         in that variable; if a NULL is given the end pointer will 
2931                                         not be returned.  The last argument is the base to use.  If 
2932                                         a 0 is indicated, the routine will attempt to determine the 
2933                                         proper base by looking at the values prefix (A '0' for octal,
2934                                         a 'x' for hex, etc ...  If a value is given it will use that 
2935                                         value as the base. 
2936                                 ---------------------------------------------------------------- */ 
2937                                 board.numports = simple_strtoul(str, NULL, 0);
2938                                 nbdevs += board.numports;
2939                                 last = index;
2940                                 break;
2941
2942                         case 5:
2943                                 t2 = str;
2944                                 while (isxdigit(*t2))
2945                                         t2++;
2946
2947                                 if (*t2) {
2948                                         printk(KERN_ERR "epca_setup: Invalid i/o address %s\n", str);
2949                                         invalid_lilo_config = 1;
2950                                         setup_error_code |= INVALID_PORT_BASE;
2951                                         return;
2952                                 }
2953
2954                                 board.port = simple_strtoul(str, NULL, 16);
2955                                 last = index;
2956                                 break;
2957
2958                         case 6:
2959                                 t2 = str;
2960                                 while (isxdigit(*t2))
2961                                         t2++;
2962
2963                                 if (*t2) {
2964                                         printk(KERN_ERR "epca_setup: Invalid memory base %s\n",str);
2965                                         invalid_lilo_config = 1;
2966                                         setup_error_code |= INVALID_MEM_BASE;
2967                                         return;
2968                                 }
2969                                 board.membase = simple_strtoul(str, NULL, 16);
2970                                 last = index;
2971                                 break;
2972                         default:
2973                                 printk(KERN_ERR "epca: Too many string parms\n");
2974                                 return;
2975                 }
2976                 str = temp;
2977         } /* End while there is a string arg */
2978
2979         if (last < 6) {
2980                 printk(KERN_ERR "epca: Insufficient parms specified\n");
2981                 return;
2982         }
2983  
2984         /* I should REALLY validate the stuff here */
2985         /* Copies our local copy of board into boards */
2986         memcpy((void *)&boards[num_cards],(void *)&board, sizeof(board));
2987         /* Does this get called once per lilo arg are what ? */
2988         printk(KERN_INFO "PC/Xx: Added board %i, %s %i ports at 0x%4.4X base 0x%6.6X\n", 
2989                 num_cards, board_desc[board.type], 
2990                 board.numports, (int)board.port, (unsigned int) board.membase);
2991         num_cards++;
2992 } /* End epca_setup */
2993
2994
2995 /* ------------------------ Begin init_PCI  --------------------------- */
2996
2997 enum epic_board_types {
2998         brd_xr = 0,
2999         brd_xem,
3000         brd_cx,
3001         brd_xrj,
3002 };
3003
3004
3005 /* indexed directly by epic_board_types enum */
3006 static struct {
3007         unsigned char board_type;
3008         unsigned bar_idx;               /* PCI base address region */
3009 } epca_info_tbl[] = {
3010         { PCIXR, 0, },
3011         { PCIXEM, 0, },
3012         { PCICX, 0, },
3013         { PCIXRJ, 2, },
3014 };
3015
3016 static int __devinit epca_init_one (struct pci_dev *pdev,
3017                                  const struct pci_device_id *ent)
3018 {
3019         static int board_num = -1;
3020         int board_idx, info_idx = ent->driver_data;
3021         unsigned long addr;
3022
3023         if (pci_enable_device(pdev))
3024                 return -EIO;
3025
3026         board_num++;
3027         board_idx = board_num + num_cards;
3028         if (board_idx >= MAXBOARDS)
3029                 goto err_out;
3030         
3031         addr = pci_resource_start (pdev, epca_info_tbl[info_idx].bar_idx);
3032         if (!addr) {
3033                 printk (KERN_ERR PFX "PCI region #%d not available (size 0)\n",
3034                         epca_info_tbl[info_idx].bar_idx);
3035                 goto err_out;
3036         }
3037
3038         boards[board_idx].status = ENABLED;
3039         boards[board_idx].type = epca_info_tbl[info_idx].board_type;
3040         boards[board_idx].numports = 0x0;
3041         boards[board_idx].port = addr + PCI_IO_OFFSET;
3042         boards[board_idx].membase = addr;
3043
3044         if (!request_mem_region (addr + PCI_IO_OFFSET, 0x200000, "epca")) {
3045                 printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailable\n",
3046                         0x200000, addr + PCI_IO_OFFSET);
3047                 goto err_out;
3048         }
3049
3050         boards[board_idx].re_map_port = ioremap(addr + PCI_IO_OFFSET, 0x200000);
3051         if (!boards[board_idx].re_map_port) {
3052                 printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lx\n",
3053                         0x200000, addr + PCI_IO_OFFSET);
3054                 goto err_out_free_pciio;
3055         }
3056
3057         if (!request_mem_region (addr, 0x200000, "epca")) {
3058                 printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailable\n",
3059                         0x200000, addr);
3060                 goto err_out_free_iounmap;
3061         }
3062
3063         boards[board_idx].re_map_membase = ioremap(addr, 0x200000);
3064         if (!boards[board_idx].re_map_membase) {
3065                 printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lx\n",
3066                         0x200000, addr + PCI_IO_OFFSET);
3067                 goto err_out_free_memregion;
3068         }
3069
3070         /* --------------------------------------------------------------
3071                 I don't know what the below does, but the hardware guys say
3072                 its required on everything except PLX (In this case XRJ).
3073         ---------------------------------------------------------------- */
3074         if (info_idx != brd_xrj) {
3075                 pci_write_config_byte(pdev, 0x40, 0);  
3076                 pci_write_config_byte(pdev, 0x46, 0);
3077         }
3078         
3079         return 0;
3080
3081 err_out_free_memregion:
3082         release_mem_region (addr, 0x200000);
3083 err_out_free_iounmap:
3084         iounmap (boards[board_idx].re_map_port);
3085 err_out_free_pciio:
3086         release_mem_region (addr + PCI_IO_OFFSET, 0x200000);
3087 err_out:
3088         return -ENODEV;
3089 }
3090
3091
3092 static struct pci_device_id epca_pci_tbl[] = {
3093         { PCI_VENDOR_DIGI, PCI_DEVICE_XR, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xr },
3094         { PCI_VENDOR_DIGI, PCI_DEVICE_XEM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xem },
3095         { PCI_VENDOR_DIGI, PCI_DEVICE_CX, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_cx },
3096         { PCI_VENDOR_DIGI, PCI_DEVICE_XRJ, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xrj },
3097         { 0, }
3098 };
3099
3100 MODULE_DEVICE_TABLE(pci, epca_pci_tbl);
3101
3102 int __init init_PCI (void)
3103 {       /* Begin init_PCI */
3104         memset (&epca_driver, 0, sizeof (epca_driver));
3105         epca_driver.name = "epca";
3106         epca_driver.id_table = epca_pci_tbl;
3107         epca_driver.probe = epca_init_one;
3108
3109         return pci_register_driver(&epca_driver);
3110 }
3111
3112 MODULE_LICENSE("GPL");