git.oblomov.eu Git - linux-2.6/blob - 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/config.h>
  34 #include <linux/module.h>
  35 #include <linux/kernel.h>
  36 #include <linux/types.h>
  37 #include <linux/init.h>
  38 #include <linux/serial.h>
  39 #include <linux/delay.h>
  40 #include <linux/ctype.h>
  41 #include <linux/tty.h>
  42 #include <linux/tty_flip.h>
  43 #include <linux/slab.h>
  44 #include <linux/ioport.h>
  45 #include <linux/interrupt.h>
  46 #include <asm/uaccess.h>
  47 #include <asm/io.h>
  48 #include <linux/spinlock.h>
  49 #include <linux/pci.h>
  50 #include "digiPCI.h"
  51
  52
  53 #include "digi1.h"
  54 #include "digiFep1.h"
  55 #include "epca.h"
  56 #include "epcaconfig.h"
  57
  58 /* ---------------------- Begin defines ------------------------ */
  59
  60 #define VERSION            "1.3.0.1-LK2.6"
  61
  62 /* This major needs to be submitted to Linux to join the majors list */
  63
  64 #define DIGIINFOMAJOR       35  /* For Digi specific ioctl */
  65
  66
  67 #define MAXCARDS 7
  68 #define epcaassert(x, msg)  if (!(x)) epca_error(__LINE__, msg)
  69
  70 #define PFX "epca: "
  71
  72 /* ----------------- Begin global definitions ------------------- */
  73
  74 static int nbdevs, num_cards, liloconfig;
  75 static int digi_poller_inhibited = 1 ;
  76
  77 static int setup_error_code;
  78 static int invalid_lilo_config;
  79
  80 /* The ISA boards do window flipping into the same spaces so its only sane
  81    with a single lock. It's still pretty efficient */
  82
  83 static spinlock_t epca_lock = SPIN_LOCK_UNLOCKED;
  84
  85 /* -----------------------------------------------------------------------
  86         MAXBOARDS is typically 12, but ISA and EISA cards are restricted to
  87         7 below.
  88 --------------------------------------------------------------------------*/
  89 static struct board_info boards[MAXBOARDS];
  90
  91
  92 /* ------------- Begin structures used for driver registeration ---------- */
  93
  94 static struct tty_driver *pc_driver;
  95 static struct tty_driver *pc_info;
  96
  97 /* ------------------ Begin Digi specific structures -------------------- */
  98
  99 /* ------------------------------------------------------------------------
 100         digi_channels represents an array of structures that keep track of
 101         each channel of the Digi product.  Information such as transmit and
 102         receive pointers, termio data, and signal definitions (DTR, CTS, etc ...)
 103         are stored here.  This structure is NOT used to overlay the cards
 104         physical channel structure.
 105 -------------------------------------------------------------------------- */
 106
 107 static struct channel digi_channels[MAX_ALLOC];
 108
 109 /* ------------------------------------------------------------------------
 110         card_ptr is an array used to hold the address of the
 111         first channel structure of each card.  This array will hold
 112         the addresses of various channels located in digi_channels.
 113 -------------------------------------------------------------------------- */
 114 static struct channel *card_ptr[MAXCARDS];
 115
 116 static struct timer_list epca_timer;
 117
 118 /* ---------------------- Begin function prototypes --------------------- */
 119
 120 /* ----------------------------------------------------------------------
 121         Begin generic memory functions.  These functions will be alias
 122         (point at) more specific functions dependent on the board being
 123         configured.
 124 ----------------------------------------------------------------------- */
 125
 126 static void memwinon(struct board_info *b, unsigned int win);
 127 static void memwinoff(struct board_info *b, unsigned int win);
 128 static void globalwinon(struct channel *ch);
 129 static void rxwinon(struct channel *ch);
 130 static void txwinon(struct channel *ch);
 131 static void memoff(struct channel *ch);
 132 static void assertgwinon(struct channel *ch);
 133 static void assertmemoff(struct channel *ch);
 134
 135 /* ---- Begin more 'specific' memory functions for cx_like products --- */
 136
 137 static void pcxem_memwinon(struct board_info *b, unsigned int win);
 138 static void pcxem_memwinoff(struct board_info *b, unsigned int win);
 139 static void pcxem_globalwinon(struct channel *ch);
 140 static void pcxem_rxwinon(struct channel *ch);
 141 static void pcxem_txwinon(struct channel *ch);
 142 static void pcxem_memoff(struct channel *ch);
 143
 144 /* ------ Begin more 'specific' memory functions for the pcxe ------- */
 145
 146 static void pcxe_memwinon(struct board_info *b, unsigned int win);
 147 static void pcxe_memwinoff(struct board_info *b, unsigned int win);
 148 static void pcxe_globalwinon(struct channel *ch);
 149 static void pcxe_rxwinon(struct channel *ch);
 150 static void pcxe_txwinon(struct channel *ch);
 151 static void pcxe_memoff(struct channel *ch);
 152
 153 /* ---- Begin more 'specific' memory functions for the pc64xe and pcxi ---- */
 154 /* Note : pc64xe and pcxi share the same windowing routines */
 155
 156 static void pcxi_memwinon(struct board_info *b, unsigned int win);
 157 static void pcxi_memwinoff(struct board_info *b, unsigned int win);
 158 static void pcxi_globalwinon(struct channel *ch);
 159 static void pcxi_rxwinon(struct channel *ch);
 160 static void pcxi_txwinon(struct channel *ch);
 161 static void pcxi_memoff(struct channel *ch);
 162
 163 /* - Begin 'specific' do nothing memory functions needed for some cards - */
 164
 165 static void dummy_memwinon(struct board_info *b, unsigned int win);
 166 static void dummy_memwinoff(struct board_info *b, unsigned int win);
 167 static void dummy_globalwinon(struct channel *ch);
 168 static void dummy_rxwinon(struct channel *ch);
 169 static void dummy_txwinon(struct channel *ch);
 170 static void dummy_memoff(struct channel *ch);
 171 static void dummy_assertgwinon(struct channel *ch);
 172 static void dummy_assertmemoff(struct channel *ch);
 173
 174 /* ------------------- Begin declare functions ----------------------- */
 175
 176 static struct channel *verifyChannel(struct tty_struct *);
 177 static void pc_sched_event(struct channel *, int);
 178 static void epca_error(int, char *);
 179 static void pc_close(struct tty_struct *, struct file *);
 180 static void shutdown(struct channel *);
 181 static void pc_hangup(struct tty_struct *);
 182 static void pc_put_char(struct tty_struct *, unsigned char);
 183 static int pc_write_room(struct tty_struct *);
 184 static int pc_chars_in_buffer(struct tty_struct *);
 185 static void pc_flush_buffer(struct tty_struct *);
 186 static void pc_flush_chars(struct tty_struct *);
 187 static int block_til_ready(struct tty_struct *, struct file *,
 188                            struct channel *);
 189 static int pc_open(struct tty_struct *, struct file *);
 190 static void post_fep_init(unsigned int crd);
 191 static void epcapoll(unsigned long);
 192 static void doevent(int);
 193 static void fepcmd(struct channel *, int, int, int, int, int);
 194 static unsigned termios2digi_h(struct channel *ch, unsigned);
 195 static unsigned termios2digi_i(struct channel *ch, unsigned);
 196 static unsigned termios2digi_c(struct channel *ch, unsigned);
 197 static void epcaparam(struct tty_struct *, struct channel *);
 198 static void receive_data(struct channel *);
 199 static int pc_ioctl(struct tty_struct *, struct file *,
 200                     unsigned int, unsigned long);
 201 static int info_ioctl(struct tty_struct *, struct file *,
 202                     unsigned int, unsigned long);
 203 static void pc_set_termios(struct tty_struct *, struct termios *);
 204 static void do_softint(void *);
 205 static void pc_stop(struct tty_struct *);
 206 static void pc_start(struct tty_struct *);
 207 static void pc_throttle(struct tty_struct * tty);
 208 static void pc_unthrottle(struct tty_struct *tty);
 209 static void digi_send_break(struct channel *ch, int msec);
 210 static void setup_empty_event(struct tty_struct *tty, struct channel *ch);
 211 void epca_setup(char *, int *);
 212
 213 static int get_termio(struct tty_struct *, struct termio __user *);
 214 static int pc_write(struct tty_struct *, const unsigned char *, int);
 215 static int pc_init(void);
 216 static int init_PCI(void);
 217
 218
 219 /* ------------------------------------------------------------------
 220         Table of functions for each board to handle memory.  Mantaining
 221         parallelism is a *very* good idea here.  The idea is for the
 222         runtime code to blindly call these functions, not knowing/caring
 223         about the underlying hardware.  This stuff should contain no
 224         conditionals; if more functionality is needed a different entry
 225         should be established.  These calls are the interface calls and
 226         are the only functions that should be accessed.  Anyone caught
 227         making direct calls deserves what they get.
 228 -------------------------------------------------------------------- */
 229
 230 static void memwinon(struct board_info *b, unsigned int win)
 231 {
 232         (b->memwinon)(b, win);
 233 }
 234
 235 static void memwinoff(struct board_info *b, unsigned int win)
 236 {
 237         (b->memwinoff)(b, win);
 238 }
 239
 240 static void globalwinon(struct channel *ch)
 241 {
 242         (ch->board->globalwinon)(ch);
 243 }
 244
 245 static void rxwinon(struct channel *ch)
 246 {
 247         (ch->board->rxwinon)(ch);
 248 }
 249
 250 static void txwinon(struct channel *ch)
 251 {
 252         (ch->board->txwinon)(ch);
 253 }
 254
 255 static void memoff(struct channel *ch)
 256 {
 257         (ch->board->memoff)(ch);
 258 }
 259 static void assertgwinon(struct channel *ch)
 260 {
 261         (ch->board->assertgwinon)(ch);
 262 }
 263
 264 static void assertmemoff(struct channel *ch)
 265 {
 266         (ch->board->assertmemoff)(ch);
 267 }
 268
 269 /* ---------------------------------------------------------
 270         PCXEM windowing is the same as that used in the PCXR
 271         and CX series cards.
 272 ------------------------------------------------------------ */
 273
 274 static void pcxem_memwinon(struct board_info *b, unsigned int win)
 275 {
 276         outb_p(FEPWIN|win, b->port + 1);
 277 }
 278
 279 static void pcxem_memwinoff(struct board_info *b, unsigned int win)
 280 {
 281         outb_p(0, b->port + 1);
 282 }
 283
 284 static void pcxem_globalwinon(struct channel *ch)
 285 {
 286         outb_p( FEPWIN, (int)ch->board->port + 1);
 287 }
 288
 289 static void pcxem_rxwinon(struct channel *ch)
 290 {
 291         outb_p(ch->rxwin, (int)ch->board->port + 1);
 292 }
 293
 294 static void pcxem_txwinon(struct channel *ch)
 295 {
 296         outb_p(ch->txwin, (int)ch->board->port + 1);
 297 }
 298
 299 static void pcxem_memoff(struct channel *ch)
 300 {
 301         outb_p(0, (int)ch->board->port + 1);
 302 }
 303
 304 /* ----------------- Begin pcxe memory window stuff ------------------ */
 305
 306 static void pcxe_memwinon(struct board_info *b, unsigned int win)
 307 {
 308                outb_p(FEPWIN | win, b->port + 1);
 309 }
 310
 311 static void pcxe_memwinoff(struct board_info *b, unsigned int win)
 312 {
 313         outb_p(inb(b->port) & ~FEPMEM,
 314                    b->port + 1);
 315         outb_p(0, b->port + 1);
 316 }
 317
 318 static void pcxe_globalwinon(struct channel *ch)
 319 {
 320         outb_p( FEPWIN, (int)ch->board->port + 1);
 321 }
 322
 323 static void pcxe_rxwinon(struct channel *ch)
 324 {
 325                 outb_p(ch->rxwin, (int)ch->board->port + 1);
 326 }
 327
 328 static void pcxe_txwinon(struct channel *ch)
 329 {
 330                 outb_p(ch->txwin, (int)ch->board->port + 1);
 331 }
 332
 333 static void pcxe_memoff(struct channel *ch)
 334 {
 335         outb_p(0, (int)ch->board->port);
 336         outb_p(0, (int)ch->board->port + 1);
 337 }
 338
 339 /* ------------- Begin pc64xe and pcxi memory window stuff -------------- */
 340
 341 static void pcxi_memwinon(struct board_info *b, unsigned int win)
 342 {
 343                outb_p(inb(b->port) | FEPMEM, b->port);
 344 }
 345
 346 static void pcxi_memwinoff(struct board_info *b, unsigned int win)
 347 {
 348         outb_p(inb(b->port) & ~FEPMEM, b->port);
 349 }
 350
 351 static void pcxi_globalwinon(struct channel *ch)
 352 {
 353         outb_p(FEPMEM, ch->board->port);
 354 }
 355
 356 static void pcxi_rxwinon(struct channel *ch)
 357 {
 358                 outb_p(FEPMEM, ch->board->port);
 359 }
 360
 361 static void pcxi_txwinon(struct channel *ch)
 362 {
 363                 outb_p(FEPMEM, ch->board->port);
 364 }
 365
 366 static void pcxi_memoff(struct channel *ch)
 367 {
 368         outb_p(0, ch->board->port);
 369 }
 370
 371 static void pcxi_assertgwinon(struct channel *ch)
 372 {
 373         epcaassert(inb(ch->board->port) & FEPMEM, "Global memory off");
 374 }
 375
 376 static void pcxi_assertmemoff(struct channel *ch)
 377 {
 378         epcaassert(!(inb(ch->board->port) & FEPMEM), "Memory on");
 379 }
 380
 381
 382 /* ----------------------------------------------------------------------
 383         Not all of the cards need specific memory windowing routines.  Some
 384         cards (Such as PCI) needs no windowing routines at all.  We provide
 385         these do nothing routines so that the same code base can be used.
 386         The driver will ALWAYS call a windowing routine if it thinks it needs
 387         to; regardless of the card.  However, dependent on the card the routine
 388         may or may not do anything.
 389 ---------------------------------------------------------------------------*/
 390
 391 static void dummy_memwinon(struct board_info *b, unsigned int win)
 392 {
 393 }
 394
 395 static void dummy_memwinoff(struct board_info *b, unsigned int win)
 396 {
 397 }
 398
 399 static void dummy_globalwinon(struct channel *ch)
 400 {
 401 }
 402
 403 static void dummy_rxwinon(struct channel *ch)
 404 {
 405 }
 406
 407 static void dummy_txwinon(struct channel *ch)
 408 {
 409 }
 410
 411 static void dummy_memoff(struct channel *ch)
 412 {
 413 }
 414
 415 static void dummy_assertgwinon(struct channel *ch)
 416 {
 417 }
 418
 419 static void dummy_assertmemoff(struct channel *ch)
 420 {
 421 }
 422
 423 /* ----------------- Begin verifyChannel function ----------------------- */
 424 static struct channel *verifyChannel(struct tty_struct *tty)
 425 { /* Begin verifyChannel */
 426         /* --------------------------------------------------------------------
 427                 This routine basically provides a sanity check.  It insures that
 428                 the channel returned is within the proper range of addresses as
 429                 well as properly initialized.  If some bogus info gets passed in
 430                 through tty->driver_data this should catch it.
 431                 --------------------------------------------------------------------- */
 432         if (tty) {
 433                 struct channel *ch = (struct channel *)tty->driver_data;
 434                 if ((ch >= &digi_channels[0]) && (ch < &digi_channels[nbdevs])) {
 435                         if (ch->magic == EPCA_MAGIC)
 436                                 return ch;
 437                 }
 438         }
 439         return NULL;
 440
 441 } /* End verifyChannel */
 442
 443 /* ------------------ Begin pc_sched_event ------------------------- */
 444
 445 static void pc_sched_event(struct channel *ch, int event)
 446 {
 447         /* ----------------------------------------------------------------------
 448                 We call this to schedule interrupt processing on some event.  The
 449                 kernel sees our request and calls the related routine in OUR driver.
 450         -------------------------------------------------------------------------*/
 451         ch->event |= 1 << event;
 452         schedule_work(&ch->tqueue);
 453 } /* End pc_sched_event */
 454
 455 /* ------------------ Begin epca_error ------------------------- */
 456
 457 static void epca_error(int line, char *msg)
 458 {
 459         printk(KERN_ERR "epca_error (Digi): line = %d %s\n",line,msg);
 460 }
 461
 462 /* ------------------ Begin pc_close ------------------------- */
 463 static void pc_close(struct tty_struct * tty, struct file * filp)
 464 {
 465         struct channel *ch;
 466         unsigned long flags;
 467         /* ---------------------------------------------------------
 468                 verifyChannel returns the channel from the tty struct
 469                 if it is valid.  This serves as a sanity check.
 470         ------------------------------------------------------------- */
 471         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if ch != NULL */
 472                 spin_lock_irqsave(&epca_lock, flags);
 473                 if (tty_hung_up_p(filp)) {
 474                         spin_unlock_irqrestore(&epca_lock, flags);
 475                         return;
 476                 }
 477                 /* Check to see if the channel is open more than once */
 478                 if (ch->count-- > 1)  {
 479                         /* Begin channel is open more than once */
 480                         /* -------------------------------------------------------------
 481                                 Return without doing anything.  Someone might still be using
 482                                 the channel.
 483                         ---------------------------------------------------------------- */
 484                         spin_unlock_irqrestore(&epca_lock, flags);
 485                         return;
 486                 } /* End channel is open more than once */
 487
 488                 /* Port open only once go ahead with shutdown & reset */
 489                 if (ch->count < 0)
 490                         BUG();
 491
 492                 /* ---------------------------------------------------------------
 493                         Let the rest of the driver know the channel is being closed.
 494                         This becomes important if an open is attempted before close
 495                         is finished.
 496                 ------------------------------------------------------------------ */
 497                 ch->asyncflags |= ASYNC_CLOSING;
 498                 tty->closing = 1;
 499
 500                 spin_unlock_irqrestore(&epca_lock, flags);
 501
 502                 if (ch->asyncflags & ASYNC_INITIALIZED)  {
 503                         /* Setup an event to indicate when the transmit buffer empties */
 504                         setup_empty_event(tty, ch);
 505                         tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
 506                 }
 507                 if (tty->driver->flush_buffer)
 508                         tty->driver->flush_buffer(tty);
 509
 510                 tty_ldisc_flush(tty);
 511                 shutdown(ch);
 512
 513                 spin_lock_irqsave(&epca_lock, flags);
 514                 tty->closing = 0;
 515                 ch->event = 0;
 516                 ch->tty = NULL;
 517                 spin_unlock_irqrestore(&epca_lock, flags);
 518
 519                 if (ch->blocked_open)  { /* Begin if blocked_open */
 520                         if (ch->close_delay)
 521                                 msleep_interruptible(jiffies_to_msecs(ch->close_delay));
 522                         wake_up_interruptible(&ch->open_wait);
 523                 } /* End if blocked_open */
 524                 ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED |
 525                                       ASYNC_CLOSING);
 526                 wake_up_interruptible(&ch->close_wait);
 527         } /* End if ch != NULL */
 528 } /* End pc_close */
 529
 530 /* ------------------ Begin shutdown  ------------------------- */
 531
 532 static void shutdown(struct channel *ch)
 533 { /* Begin shutdown */
 534
 535         unsigned long flags;
 536         struct tty_struct *tty;
 537         struct board_chan __iomem *bc;
 538
 539         if (!(ch->asyncflags & ASYNC_INITIALIZED))
 540                 return;
 541
 542         spin_lock_irqsave(&epca_lock, flags);
 543
 544         globalwinon(ch);
 545         bc = ch->brdchan;
 546
 547         /* ------------------------------------------------------------------
 548                 In order for an event to be generated on the receipt of data the
 549                 idata flag must be set. Since we are shutting down, this is not
 550                 necessary clear this flag.
 551         --------------------------------------------------------------------- */
 552
 553         if (bc)
 554                 writeb(0, &bc->idata);
 555         tty = ch->tty;
 556
 557         /* ----------------------------------------------------------------
 558            If we're a modem control device and HUPCL is on, drop RTS & DTR.
 559         ------------------------------------------------------------------ */
 560
 561         if (tty->termios->c_cflag & HUPCL)  {
 562                 ch->omodem &= ~(ch->m_rts | ch->m_dtr);
 563                 fepcmd(ch, SETMODEM, 0, ch->m_dtr | ch->m_rts, 10, 1);
 564         }
 565         memoff(ch);
 566
 567         /* ------------------------------------------------------------------
 568                 The channel has officialy been closed.  The next time it is opened
 569                 it will have to reinitialized.  Set a flag to indicate this.
 570         ---------------------------------------------------------------------- */
 571
 572         /* Prevent future Digi programmed interrupts from coming active */
 573
 574         ch->asyncflags &= ~ASYNC_INITIALIZED;
 575         spin_unlock_irqrestore(&epca_lock, flags);
 576
 577 } /* End shutdown */
 578
 579 /* ------------------ Begin pc_hangup  ------------------------- */
 580
 581 static void pc_hangup(struct tty_struct *tty)
 582 { /* Begin pc_hangup */
 583         struct channel *ch;
 584
 585         /* ---------------------------------------------------------
 586                 verifyChannel returns the channel from the tty struct
 587                 if it is valid.  This serves as a sanity check.
 588         ------------------------------------------------------------- */
 589
 590         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if ch != NULL */
 591                 unsigned long flags;
 592
 593                 if (tty->driver->flush_buffer)
 594                         tty->driver->flush_buffer(tty);
 595                 tty_ldisc_flush(tty);
 596                 shutdown(ch);
 597
 598                 spin_lock_irqsave(&epca_lock, flags);
 599                 ch->tty   = NULL;
 600                 ch->event = 0;
 601                 ch->count = 0;
 602                 ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED);
 603                 spin_unlock_irqrestore(&epca_lock, flags);
 604                 wake_up_interruptible(&ch->open_wait);
 605         } /* End if ch != NULL */
 606
 607 } /* End pc_hangup */
 608
 609 /* ------------------ Begin pc_write  ------------------------- */
 610
 611 static int pc_write(struct tty_struct * tty,
 612                     const unsigned char *buf, int bytesAvailable)
 613 { /* Begin pc_write */
 614         unsigned int head, tail;
 615         int dataLen;
 616         int size;
 617         int amountCopied;
 618         struct channel *ch;
 619         unsigned long flags;
 620         int remain;
 621         struct board_chan __iomem *bc;
 622
 623         /* ----------------------------------------------------------------
 624                 pc_write is primarily called directly by the kernel routine
 625                 tty_write (Though it can also be called by put_char) found in
 626                 tty_io.c.  pc_write is passed a line discipline buffer where
 627                 the data to be written out is stored.  The line discipline
 628                 implementation itself is done at the kernel level and is not
 629                 brought into the driver.
 630         ------------------------------------------------------------------- */
 631
 632         /* ---------------------------------------------------------
 633                 verifyChannel returns the channel from the tty struct
 634                 if it is valid.  This serves as a sanity check.
 635         ------------------------------------------------------------- */
 636
 637         if ((ch = verifyChannel(tty)) == NULL)
 638                 return 0;
 639
 640         /* Make a pointer to the channel data structure found on the board. */
 641
 642         bc   = ch->brdchan;
 643         size = ch->txbufsize;
 644         amountCopied = 0;
 645
 646         spin_lock_irqsave(&epca_lock, flags);
 647         globalwinon(ch);
 648
 649         head = readw(&bc->tin) & (size - 1);
 650         tail = readw(&bc->tout);
 651
 652         if (tail != readw(&bc->tout))
 653                 tail = readw(&bc->tout);
 654         tail &= (size - 1);
 655
 656         /*      If head >= tail, head has not wrapped around. */
 657         if (head >= tail)  { /* Begin head has not wrapped */
 658                 /* ---------------------------------------------------------------
 659                         remain (much like dataLen above) represents the total amount of
 660                         space available on the card for data.  Here dataLen represents
 661                         the space existing between the head pointer and the end of
 662                         buffer.  This is important because a memcpy cannot be told to
 663                         automatically wrap around when it hits the buffer end.
 664                 ------------------------------------------------------------------ */
 665                 dataLen = size - head;
 666                 remain = size - (head - tail) - 1;
 667         } else { /* Begin head has wrapped around */
 668
 669                 remain = tail - head - 1;
 670                 dataLen = remain;
 671
 672         } /* End head has wrapped around */
 673         /* -------------------------------------------------------------------
 674                         Check the space on the card.  If we have more data than
 675                         space; reduce the amount of data to fit the space.
 676         ---------------------------------------------------------------------- */
 677         bytesAvailable = min(remain, bytesAvailable);
 678         txwinon(ch);
 679         while (bytesAvailable > 0)
 680         { /* Begin while there is data to copy onto card */
 681
 682                 /* -----------------------------------------------------------------
 683                         If head is not wrapped, the below will make sure the first
 684                         data copy fills to the end of card buffer.
 685                 ------------------------------------------------------------------- */
 686
 687                 dataLen = min(bytesAvailable, dataLen);
 688                 memcpy_toio(ch->txptr + head, buf, dataLen);
 689                 buf += dataLen;
 690                 head += dataLen;
 691                 amountCopied += dataLen;
 692                 bytesAvailable -= dataLen;
 693
 694                 if (head >= size) {
 695                         head = 0;
 696                         dataLen = tail;
 697                 }
 698         } /* End while there is data to copy onto card */
 699         ch->statusflags |= TXBUSY;
 700         globalwinon(ch);
 701         writew(head, &bc->tin);
 702
 703         if ((ch->statusflags & LOWWAIT) == 0)  {
 704                 ch->statusflags |= LOWWAIT;
 705                 writeb(1, &bc->ilow);
 706         }
 707         memoff(ch);
 708         spin_unlock_irqrestore(&epca_lock, flags);
 709         return(amountCopied);
 710
 711 } /* End pc_write */
 712
 713 /* ------------------ Begin pc_put_char  ------------------------- */
 714
 715 static void pc_put_char(struct tty_struct *tty, unsigned char c)
 716 { /* Begin pc_put_char */
 717         pc_write(tty, &c, 1);
 718 } /* End pc_put_char */
 719
 720 /* ------------------ Begin pc_write_room  ------------------------- */
 721
 722 static int pc_write_room(struct tty_struct *tty)
 723 { /* Begin pc_write_room */
 724
 725         int remain;
 726         struct channel *ch;
 727         unsigned long flags;
 728         unsigned int head, tail;
 729         struct board_chan __iomem *bc;
 730
 731         remain = 0;
 732
 733         /* ---------------------------------------------------------
 734                 verifyChannel returns the channel from the tty struct
 735                 if it is valid.  This serves as a sanity check.
 736         ------------------------------------------------------------- */
 737
 738         if ((ch = verifyChannel(tty)) != NULL)  {
 739                 spin_lock_irqsave(&epca_lock, flags);
 740                 globalwinon(ch);
 741
 742                 bc   = ch->brdchan;
 743                 head = readw(&bc->tin) & (ch->txbufsize - 1);
 744                 tail = readw(&bc->tout);
 745
 746                 if (tail != readw(&bc->tout))
 747                         tail = readw(&bc->tout);
 748                 /* Wrap tail if necessary */
 749                 tail &= (ch->txbufsize - 1);
 750
 751                 if ((remain = tail - head - 1) < 0 )
 752                         remain += ch->txbufsize;
 753
 754                 if (remain && (ch->statusflags & LOWWAIT) == 0) {
 755                         ch->statusflags |= LOWWAIT;
 756                         writeb(1, &bc->ilow);
 757                 }
 758                 memoff(ch);
 759                 spin_unlock_irqrestore(&epca_lock, flags);
 760         }
 761         /* Return how much room is left on card */
 762         return remain;
 763
 764 } /* End pc_write_room */
 765
 766 /* ------------------ Begin pc_chars_in_buffer  ---------------------- */
 767
 768 static int pc_chars_in_buffer(struct tty_struct *tty)
 769 { /* Begin pc_chars_in_buffer */
 770
 771         int chars;
 772         unsigned int ctail, head, tail;
 773         int remain;
 774         unsigned long flags;
 775         struct channel *ch;
 776         struct board_chan __iomem *bc;
 777
 778         /* ---------------------------------------------------------
 779                 verifyChannel returns the channel from the tty struct
 780                 if it is valid.  This serves as a sanity check.
 781         ------------------------------------------------------------- */
 782
 783         if ((ch = verifyChannel(tty)) == NULL)
 784                 return(0);
 785
 786         spin_lock_irqsave(&epca_lock, flags);
 787         globalwinon(ch);
 788
 789         bc = ch->brdchan;
 790         tail = readw(&bc->tout);
 791         head = readw(&bc->tin);
 792         ctail = readw(&ch->mailbox->cout);
 793
 794         if (tail == head && readw(&ch->mailbox->cin) == ctail && readb(&bc->tbusy) == 0)
 795                 chars = 0;
 796         else  { /* Begin if some space on the card has been used */
 797                 head = readw(&bc->tin) & (ch->txbufsize - 1);
 798                 tail &= (ch->txbufsize - 1);
 799                 /*  --------------------------------------------------------------
 800                         The logic here is basically opposite of the above pc_write_room
 801                         here we are finding the amount of bytes in the buffer filled.
 802                         Not the amount of bytes empty.
 803                 ------------------------------------------------------------------- */
 804                 if ((remain = tail - head - 1) < 0 )
 805                         remain += ch->txbufsize;
 806                 chars = (int)(ch->txbufsize - remain);
 807                 /* -------------------------------------------------------------
 808                         Make it possible to wakeup anything waiting for output
 809                         in tty_ioctl.c, etc.
 810
 811                         If not already set.  Setup an event to indicate when the
 812                         transmit buffer empties
 813                 ----------------------------------------------------------------- */
 814                 if (!(ch->statusflags & EMPTYWAIT))
 815                         setup_empty_event(tty,ch);
 816
 817         } /* End if some space on the card has been used */
 818         memoff(ch);
 819         spin_unlock_irqrestore(&epca_lock, flags);
 820         /* Return number of characters residing on card. */
 821         return(chars);
 822
 823 } /* End pc_chars_in_buffer */
 824
 825 /* ------------------ Begin pc_flush_buffer  ---------------------- */
 826
 827 static void pc_flush_buffer(struct tty_struct *tty)
 828 { /* Begin pc_flush_buffer */
 829
 830         unsigned int tail;
 831         unsigned long flags;
 832         struct channel *ch;
 833         struct board_chan __iomem *bc;
 834         /* ---------------------------------------------------------
 835                 verifyChannel returns the channel from the tty struct
 836                 if it is valid.  This serves as a sanity check.
 837         ------------------------------------------------------------- */
 838         if ((ch = verifyChannel(tty)) == NULL)
 839                 return;
 840
 841         spin_lock_irqsave(&epca_lock, flags);
 842         globalwinon(ch);
 843         bc   = ch->brdchan;
 844         tail = readw(&bc->tout);
 845         /* Have FEP move tout pointer; effectively flushing transmit buffer */
 846         fepcmd(ch, STOUT, (unsigned) tail, 0, 0, 0);
 847         memoff(ch);
 848         spin_unlock_irqrestore(&epca_lock, flags);
 849         wake_up_interruptible(&tty->write_wait);
 850         tty_wakeup(tty);
 851 } /* End pc_flush_buffer */
 852
 853 /* ------------------ Begin pc_flush_chars  ---------------------- */
 854
 855 static void pc_flush_chars(struct tty_struct *tty)
 856 { /* Begin pc_flush_chars */
 857         struct channel * ch;
 858         /* ---------------------------------------------------------
 859                 verifyChannel returns the channel from the tty struct
 860                 if it is valid.  This serves as a sanity check.
 861         ------------------------------------------------------------- */
 862         if ((ch = verifyChannel(tty)) != NULL) {
 863                 unsigned long flags;
 864                 spin_lock_irqsave(&epca_lock, flags);
 865                 /* ----------------------------------------------------------------
 866                         If not already set and the transmitter is busy setup an event
 867                         to indicate when the transmit empties.
 868                 ------------------------------------------------------------------- */
 869                 if ((ch->statusflags & TXBUSY) && !(ch->statusflags & EMPTYWAIT))
 870                         setup_empty_event(tty,ch);
 871                 spin_unlock_irqrestore(&epca_lock, flags);
 872         }
 873 } /* End pc_flush_chars */
 874
 875 /* ------------------ Begin block_til_ready  ---------------------- */
 876
 877 static int block_til_ready(struct tty_struct *tty,
 878                            struct file *filp, struct channel *ch)
 879 { /* Begin block_til_ready */
 880         DECLARE_WAITQUEUE(wait,current);
 881         int     retval, do_clocal = 0;
 882         unsigned long flags;
 883
 884         if (tty_hung_up_p(filp)) {
 885                 if (ch->asyncflags & ASYNC_HUP_NOTIFY)
 886                         retval = -EAGAIN;
 887                 else
 888                         retval = -ERESTARTSYS;
 889                 return(retval);
 890         }
 891
 892         /* -----------------------------------------------------------------
 893                 If the device is in the middle of being closed, then block
 894                 until it's done, and then try again.
 895         -------------------------------------------------------------------- */
 896         if (ch->asyncflags & ASYNC_CLOSING) {
 897                 interruptible_sleep_on(&ch->close_wait);
 898
 899                 if (ch->asyncflags & ASYNC_HUP_NOTIFY)
 900                         return -EAGAIN;
 901                 else
 902                         return -ERESTARTSYS;
 903         }
 904
 905         if (filp->f_flags & O_NONBLOCK)  {
 906                 /* -----------------------------------------------------------------
 907                  If non-blocking mode is set, then make the check up front
 908                  and then exit.
 909                 -------------------------------------------------------------------- */
 910                 ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
 911                 return 0;
 912         }
 913         if (tty->termios->c_cflag & CLOCAL)
 914                 do_clocal = 1;
 915         /* Block waiting for the carrier detect and the line to become free */
 916
 917         retval = 0;
 918         add_wait_queue(&ch->open_wait, &wait);
 919
 920         spin_lock_irqsave(&epca_lock, flags);
 921         /* We dec count so that pc_close will know when to free things */
 922         if (!tty_hung_up_p(filp))
 923                 ch->count--;
 924         ch->blocked_open++;
 925         while(1)
 926         { /* Begin forever while  */
 927                 set_current_state(TASK_INTERRUPTIBLE);
 928                 if (tty_hung_up_p(filp) ||
 929                     !(ch->asyncflags & ASYNC_INITIALIZED))
 930                 {
 931                         if (ch->asyncflags & ASYNC_HUP_NOTIFY)
 932                                 retval = -EAGAIN;
 933                         else
 934                                 retval = -ERESTARTSYS;
 935                         break;
 936                 }
 937                 if (!(ch->asyncflags & ASYNC_CLOSING) &&
 938                           (do_clocal || (ch->imodem & ch->dcd)))
 939                         break;
 940                 if (signal_pending(current)) {
 941                         retval = -ERESTARTSYS;
 942                         break;
 943                 }
 944                 spin_unlock_irqrestore(&epca_lock, flags);
 945                 /* ---------------------------------------------------------------
 946                         Allow someone else to be scheduled.  We will occasionally go
 947                         through this loop until one of the above conditions change.
 948                         The below schedule call will allow other processes to enter and
 949                         prevent this loop from hogging the cpu.
 950                 ------------------------------------------------------------------ */
 951                 schedule();
 952                 spin_lock_irqsave(&epca_lock, flags);
 953
 954         } /* End forever while  */
 955
 956         current->state = TASK_RUNNING;
 957         remove_wait_queue(&ch->open_wait, &wait);
 958         if (!tty_hung_up_p(filp))
 959                 ch->count++;
 960         ch->blocked_open--;
 961
 962         spin_unlock_irqrestore(&epca_lock, flags);
 963
 964         if (retval)
 965                 return retval;
 966
 967         ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
 968         return 0;
 969 } /* End block_til_ready */
 970
 971 /* ------------------ Begin pc_open  ---------------------- */
 972
 973 static int pc_open(struct tty_struct *tty, struct file * filp)
 974 { /* Begin pc_open */
 975
 976         struct channel *ch;
 977         unsigned long flags;
 978         int line, retval, boardnum;
 979         struct board_chan __iomem *bc;
 980         unsigned int head;
 981
 982         line = tty->index;
 983         if (line < 0 || line >= nbdevs)
 984                 return -ENODEV;
 985
 986         ch = &digi_channels[line];
 987         boardnum = ch->boardnum;
 988
 989         /* Check status of board configured in system.  */
 990
 991         /* -----------------------------------------------------------------
 992                 I check to see if the epca_setup routine detected an user error.
 993                 It might be better to put this in pc_init, but for the moment it
 994                 goes here.
 995         ---------------------------------------------------------------------- */
 996
 997         if (invalid_lilo_config) {
 998                 if (setup_error_code & INVALID_BOARD_TYPE)
 999                         printk(KERN_ERR "epca: pc_open: Invalid board type specified in kernel options.\n");
1000                 if (setup_error_code & INVALID_NUM_PORTS)
1001                         printk(KERN_ERR "epca: pc_open: Invalid number of ports specified in kernel options.\n");
1002                 if (setup_error_code & INVALID_MEM_BASE)
1003                         printk(KERN_ERR "epca: pc_open: Invalid board memory address specified in kernel options.\n");
1004                 if (setup_error_code & INVALID_PORT_BASE)
1005                         printk(KERN_ERR "epca; pc_open: Invalid board port address specified in kernel options.\n");
1006                 if (setup_error_code & INVALID_BOARD_STATUS)
1007                         printk(KERN_ERR "epca: pc_open: Invalid board status specified in kernel options.\n");
1008                 if (setup_error_code & INVALID_ALTPIN)
1009                         printk(KERN_ERR "epca: pc_open: Invalid board altpin specified in kernel options;\n");
1010                 tty->driver_data = NULL;   /* Mark this device as 'down' */
1011                 return -ENODEV;
1012         }
1013         if (boardnum >= num_cards || boards[boardnum].status == DISABLED)  {
1014                 tty->driver_data = NULL;   /* Mark this device as 'down' */
1015                 return(-ENODEV);
1016         }
1017
1018         if ((bc = ch->brdchan) == 0) {
1019                 tty->driver_data = NULL;
1020                 return -ENODEV;
1021         }
1022
1023         spin_lock_irqsave(&epca_lock, flags);
1024         /* ------------------------------------------------------------------
1025                 Every time a channel is opened, increment a counter.  This is
1026                 necessary because we do not wish to flush and shutdown the channel
1027                 until the last app holding the channel open, closes it.
1028         --------------------------------------------------------------------- */
1029         ch->count++;
1030         /* ----------------------------------------------------------------
1031                 Set a kernel structures pointer to our local channel
1032                 structure.  This way we can get to it when passed only
1033                 a tty struct.
1034         ------------------------------------------------------------------ */
1035         tty->driver_data = ch;
1036         /* ----------------------------------------------------------------
1037                 If this is the first time the channel has been opened, initialize
1038                 the tty->termios struct otherwise let pc_close handle it.
1039         -------------------------------------------------------------------- */
1040         globalwinon(ch);
1041         ch->statusflags = 0;
1042
1043         /* Save boards current modem status */
1044         ch->imodem = readb(&bc->mstat);
1045
1046         /* ----------------------------------------------------------------
1047            Set receive head and tail ptrs to each other.  This indicates
1048            no data available to read.
1049         ----------------------------------------------------------------- */
1050         head = readw(&bc->rin);
1051         writew(head, &bc->rout);
1052
1053         /* Set the channels associated tty structure */
1054         ch->tty = tty;
1055
1056         /* -----------------------------------------------------------------
1057                 The below routine generally sets up parity, baud, flow control
1058                 issues, etc.... It effect both control flags and input flags.
1059         -------------------------------------------------------------------- */
1060         epcaparam(tty,ch);
1061         ch->asyncflags |= ASYNC_INITIALIZED;
1062         memoff(ch);
1063         spin_unlock_irqrestore(&epca_lock, flags);
1064
1065         retval = block_til_ready(tty, filp, ch);
1066         if (retval)
1067                 return retval;
1068         /* -------------------------------------------------------------
1069                 Set this again in case a hangup set it to zero while this
1070                 open() was waiting for the line...
1071         --------------------------------------------------------------- */
1072         spin_lock_irqsave(&epca_lock, flags);
1073         ch->tty = tty;
1074         globalwinon(ch);
1075         /* Enable Digi Data events */
1076         writeb(1, &bc->idata);
1077         memoff(ch);
1078         spin_unlock_irqrestore(&epca_lock, flags);
1079         return 0;
1080 } /* End pc_open */
1081
1082 static int __init epca_module_init(void)
1083 { /* Begin init_module */
1084         return pc_init();
1085 }
1086
1087 module_init(epca_module_init);
1088
1089 static struct pci_driver epca_driver;
1090
1091 static void __exit epca_module_exit(void)
1092 {
1093         int               count, crd;
1094         struct board_info *bd;
1095         struct channel    *ch;
1096
1097         del_timer_sync(&epca_timer);
1098
1099         if ((tty_unregister_driver(pc_driver)) ||
1100             (tty_unregister_driver(pc_info)))
1101         {
1102                 printk(KERN_WARNING "epca: cleanup_module failed to un-register tty driver\n");
1103                 return;
1104         }
1105         put_tty_driver(pc_driver);
1106         put_tty_driver(pc_info);
1107
1108         for (crd = 0; crd < num_cards; crd++)  { /* Begin for each card */
1109                 bd = &boards[crd];
1110                 if (!bd)
1111                 { /* Begin sanity check */
1112                         printk(KERN_ERR "<Error> - Digi : cleanup_module failed\n");
1113                         return;
1114                 } /* End sanity check */
1115                 ch = card_ptr[crd];
1116                 for (count = 0; count < bd->numports; count++, ch++)
1117                 { /* Begin for each port */
1118                         if (ch) {
1119                                 if (ch->tty)
1120                                         tty_hangup(ch->tty);
1121                                 kfree(ch->tmp_buf);
1122                         }
1123                 } /* End for each port */
1124         } /* End for each card */
1125         pci_unregister_driver (&epca_driver);
1126 }
1127
1128 module_exit(epca_module_exit);
1129
1130 static struct tty_operations pc_ops = {
1131         .open = pc_open,
1132         .close = pc_close,
1133         .write = pc_write,
1134         .write_room = pc_write_room,
1135         .flush_buffer = pc_flush_buffer,
1136         .chars_in_buffer = pc_chars_in_buffer,
1137         .flush_chars = pc_flush_chars,
1138         .put_char = pc_put_char,
1139         .ioctl = pc_ioctl,
1140         .set_termios = pc_set_termios,
1141         .stop = pc_stop,
1142         .start = pc_start,
1143         .throttle = pc_throttle,
1144         .unthrottle = pc_unthrottle,
1145         .hangup = pc_hangup,
1146 };
1147
1148 static int info_open(struct tty_struct *tty, struct file * filp)
1149 {
1150         return 0;
1151 }
1152
1153 static struct tty_operations info_ops = {
1154         .open = info_open,
1155         .ioctl = info_ioctl,
1156 };
1157
1158 /* ------------------ Begin pc_init  ---------------------- */
1159
1160 static int __init pc_init(void)
1161 { /* Begin pc_init */
1162         int crd;
1163         struct board_info *bd;
1164         unsigned char board_id = 0;
1165
1166         int pci_boards_found, pci_count;
1167
1168         pci_count = 0;
1169
1170         pc_driver = alloc_tty_driver(MAX_ALLOC);
1171         if (!pc_driver)
1172                 return -ENOMEM;
1173
1174         pc_info = alloc_tty_driver(MAX_ALLOC);
1175         if (!pc_info) {
1176                 put_tty_driver(pc_driver);
1177                 return -ENOMEM;
1178         }
1179
1180         /* -----------------------------------------------------------------------
1181                 If epca_setup has not been ran by LILO set num_cards to defaults; copy
1182                 board structure defined by digiConfig into drivers board structure.
1183                 Note : If LILO has ran epca_setup then epca_setup will handle defining
1184                 num_cards as well as copying the data into the board structure.
1185         -------------------------------------------------------------------------- */
1186         if (!liloconfig) { /* Begin driver has been configured via. epcaconfig */
1187
1188                 nbdevs = NBDEVS;
1189                 num_cards = NUMCARDS;
1190                 memcpy((void *)&boards, (void *)&static_boards,
1191                        (sizeof(struct board_info) * NUMCARDS));
1192         } /* End driver has been configured via. epcaconfig */
1193
1194         /* -----------------------------------------------------------------
1195                 Note : If lilo was used to configure the driver and the
1196                 ignore epcaconfig option was choosen (digiepca=2) then
1197                 nbdevs and num_cards will equal 0 at this point.  This is
1198                 okay; PCI cards will still be picked up if detected.
1199         --------------------------------------------------------------------- */
1200
1201         /*  -----------------------------------------------------------
1202                 Set up interrupt, we will worry about memory allocation in
1203                 post_fep_init.
1204         --------------------------------------------------------------- */
1205
1206
1207         printk(KERN_INFO "DIGI epca driver version %s loaded.\n",VERSION);
1208
1209         /* ------------------------------------------------------------------
1210                 NOTE : This code assumes that the number of ports found in
1211                        the boards array is correct.  This could be wrong if
1212                        the card in question is PCI (And therefore has no ports
1213                        entry in the boards structure.)  The rest of the
1214                        information will be valid for PCI because the beginning
1215                        of pc_init scans for PCI and determines i/o and base
1216                        memory addresses.  I am not sure if it is possible to
1217                        read the number of ports supported by the card prior to
1218                        it being booted (Since that is the state it is in when
1219                        pc_init is run).  Because it is not possible to query the
1220                        number of supported ports until after the card has booted;
1221                        we are required to calculate the card_ptrs as the card is
1222                        is initialized (Inside post_fep_init).  The negative thing
1223                        about this approach is that digiDload's call to GET_INFO
1224                        will have a bad port value.  (Since this is called prior
1225                        to post_fep_init.)
1226
1227         --------------------------------------------------------------------- */
1228
1229         pci_boards_found = 0;
1230         if(num_cards < MAXBOARDS)
1231                 pci_boards_found += init_PCI();
1232         num_cards += pci_boards_found;
1233
1234         pc_driver->owner = THIS_MODULE;
1235         pc_driver->name = "ttyD";
1236         pc_driver->devfs_name = "tts/D";
1237         pc_driver->major = DIGI_MAJOR;
1238         pc_driver->minor_start = 0;
1239         pc_driver->type = TTY_DRIVER_TYPE_SERIAL;
1240         pc_driver->subtype = SERIAL_TYPE_NORMAL;
1241         pc_driver->init_termios = tty_std_termios;
1242         pc_driver->init_termios.c_iflag = 0;
1243         pc_driver->init_termios.c_oflag = 0;
1244         pc_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1245         pc_driver->init_termios.c_lflag = 0;
1246         pc_driver->flags = TTY_DRIVER_REAL_RAW;
1247         tty_set_operations(pc_driver, &pc_ops);
1248
1249         pc_info->owner = THIS_MODULE;
1250         pc_info->name = "digi_ctl";
1251         pc_info->major = DIGIINFOMAJOR;
1252         pc_info->minor_start = 0;
1253         pc_info->type = TTY_DRIVER_TYPE_SERIAL;
1254         pc_info->subtype = SERIAL_TYPE_INFO;
1255         pc_info->init_termios = tty_std_termios;
1256         pc_info->init_termios.c_iflag = 0;
1257         pc_info->init_termios.c_oflag = 0;
1258         pc_info->init_termios.c_lflag = 0;
1259         pc_info->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
1260         pc_info->flags = TTY_DRIVER_REAL_RAW;
1261         tty_set_operations(pc_info, &info_ops);
1262
1263
1264         for (crd = 0; crd < num_cards; crd++)
1265         { /* Begin for each card */
1266
1267                 /*  ------------------------------------------------------------------
1268                         This is where the appropriate memory handlers for the hardware is
1269                         set.  Everything at runtime blindly jumps through these vectors.
1270                 ---------------------------------------------------------------------- */
1271
1272                 /* defined in epcaconfig.h */
1273                 bd = &boards[crd];
1274
1275                 switch (bd->type)
1276                 { /* Begin switch on bd->type {board type} */
1277                         case PCXEM:
1278                         case EISAXEM:
1279                                 bd->memwinon     = pcxem_memwinon ;
1280                                 bd->memwinoff    = pcxem_memwinoff ;
1281                                 bd->globalwinon  = pcxem_globalwinon ;
1282                                 bd->txwinon      = pcxem_txwinon ;
1283                                 bd->rxwinon      = pcxem_rxwinon ;
1284                                 bd->memoff       = pcxem_memoff ;
1285                                 bd->assertgwinon = dummy_assertgwinon;
1286                                 bd->assertmemoff = dummy_assertmemoff;
1287                                 break;
1288
1289                         case PCIXEM:
1290                         case PCIXRJ:
1291                         case PCIXR:
1292                                 bd->memwinon     = dummy_memwinon;
1293                                 bd->memwinoff    = dummy_memwinoff;
1294                                 bd->globalwinon  = dummy_globalwinon;
1295                                 bd->txwinon      = dummy_txwinon;
1296                                 bd->rxwinon      = dummy_rxwinon;
1297                                 bd->memoff       = dummy_memoff;
1298                                 bd->assertgwinon = dummy_assertgwinon;
1299                                 bd->assertmemoff = dummy_assertmemoff;
1300                                 break;
1301
1302                         case PCXE:
1303                         case PCXEVE:
1304
1305                                 bd->memwinon     = pcxe_memwinon;
1306                                 bd->memwinoff    = pcxe_memwinoff;
1307                                 bd->globalwinon  = pcxe_globalwinon;
1308                                 bd->txwinon      = pcxe_txwinon;
1309                                 bd->rxwinon      = pcxe_rxwinon;
1310                                 bd->memoff       = pcxe_memoff;
1311                                 bd->assertgwinon = dummy_assertgwinon;
1312                                 bd->assertmemoff = dummy_assertmemoff;
1313                                 break;
1314
1315                         case PCXI:
1316                         case PC64XE:
1317
1318                                 bd->memwinon     = pcxi_memwinon;
1319                                 bd->memwinoff    = pcxi_memwinoff;
1320                                 bd->globalwinon  = pcxi_globalwinon;
1321                                 bd->txwinon      = pcxi_txwinon;
1322                                 bd->rxwinon      = pcxi_rxwinon;
1323                                 bd->memoff       = pcxi_memoff;
1324                                 bd->assertgwinon = pcxi_assertgwinon;
1325                                 bd->assertmemoff = pcxi_assertmemoff;
1326                                 break;
1327
1328                         default:
1329                                 break;
1330
1331                 } /* End switch on bd->type */
1332
1333                 /* ---------------------------------------------------------------
1334                         Some cards need a memory segment to be defined for use in
1335                         transmit and receive windowing operations.  These boards
1336                         are listed in the below switch.  In the case of the XI the
1337                         amount of memory on the board is variable so the memory_seg
1338                         is also variable.  This code determines what they segment
1339                         should be.
1340                 ----------------------------------------------------------------- */
1341
1342                 switch (bd->type)
1343                 { /* Begin switch on bd->type {board type} */
1344
1345                         case PCXE:
1346                         case PCXEVE:
1347                         case PC64XE:
1348                                 bd->memory_seg = 0xf000;
1349                         break;
1350
1351                         case PCXI:
1352                                 board_id = inb((int)bd->port);
1353                                 if ((board_id & 0x1) == 0x1)
1354                                 { /* Begin it's an XI card */
1355
1356                                         /* Is it a 64K board */
1357                                         if ((board_id & 0x30) == 0)
1358                                                 bd->memory_seg = 0xf000;
1359
1360                                         /* Is it a 128K board */
1361                                         if ((board_id & 0x30) == 0x10)
1362                                                 bd->memory_seg = 0xe000;
1363
1364                                         /* Is is a 256K board */
1365                                         if ((board_id & 0x30) == 0x20)
1366                                                 bd->memory_seg = 0xc000;
1367
1368                                         /* Is it a 512K board */
1369                                         if ((board_id & 0x30) == 0x30)
1370                                                 bd->memory_seg = 0x8000;
1371
1372                                 } else printk(KERN_ERR "epca: Board at 0x%x doesn't appear to be an XI\n",(int)bd->port);
1373                         break;
1374
1375                 } /* End switch on bd->type */
1376
1377         } /* End for each card */
1378
1379         if (tty_register_driver(pc_driver))
1380                 panic("Couldn't register Digi PC/ driver");
1381
1382         if (tty_register_driver(pc_info))
1383                 panic("Couldn't register Digi PC/ info ");
1384
1385         /* -------------------------------------------------------------------
1386            Start up the poller to check for events on all enabled boards
1387         ---------------------------------------------------------------------- */
1388
1389         init_timer(&epca_timer);
1390         epca_timer.function = epcapoll;
1391         mod_timer(&epca_timer, jiffies + HZ/25);
1392         return 0;
1393
1394 } /* End pc_init */
1395
1396 /* ------------------ Begin post_fep_init  ---------------------- */
1397
1398 static void post_fep_init(unsigned int crd)
1399 { /* Begin post_fep_init */
1400
1401         int i;
1402         void __iomem *memaddr;
1403         struct global_data __iomem *gd;
1404         struct board_info *bd;
1405         struct board_chan __iomem *bc;
1406         struct channel *ch;
1407         int shrinkmem = 0, lowwater ;
1408
1409         /*  -------------------------------------------------------------
1410                 This call is made by the user via. the ioctl call DIGI_INIT.
1411                 It is responsible for setting up all the card specific stuff.
1412         ---------------------------------------------------------------- */
1413         bd = &boards[crd];
1414
1415         /* -----------------------------------------------------------------
1416                 If this is a PCI board, get the port info.  Remember PCI cards
1417                 do not have entries into the epcaconfig.h file, so we can't get
1418                 the number of ports from it.  Unfortunetly, this means that anyone
1419                 doing a DIGI_GETINFO before the board has booted will get an invalid
1420                 number of ports returned (It should return 0).  Calls to DIGI_GETINFO
1421                 after DIGI_INIT has been called will return the proper values.
1422         ------------------------------------------------------------------- */
1423
1424         if (bd->type >= PCIXEM) { /* Begin get PCI number of ports */
1425                 /* --------------------------------------------------------------------
1426                         Below we use XEMPORTS as a memory offset regardless of which PCI
1427                         card it is.  This is because all of the supported PCI cards have
1428                         the same memory offset for the channel data.  This will have to be
1429                         changed if we ever develop a PCI/XE card.  NOTE : The FEP manual
1430                         states that the port offset is 0xC22 as opposed to 0xC02.  This is
1431                         only true for PC/XE, and PC/XI cards; not for the XEM, or CX series.
1432                         On the PCI cards the number of ports is determined by reading a
1433                         ID PROM located in the box attached to the card.  The card can then
1434                         determine the index the id to determine the number of ports available.
1435                         (FYI - The id should be located at 0x1ac (And may use up to 4 bytes
1436                         if the box in question is a XEM or CX)).
1437                 ------------------------------------------------------------------------ */
1438                 /* PCI cards are already remapped at this point ISA are not */
1439                 bd->numports = readw(bd->re_map_membase + XEMPORTS);
1440                 epcaassert(bd->numports <= 64,"PCI returned a invalid number of ports");
1441                 nbdevs += (bd->numports);
1442         } else {
1443                 /* Fix up the mappings for ISA/EISA etc */
1444                 /* FIXME: 64K - can we be smarter ? */
1445                 bd->re_map_membase = ioremap(bd->membase, 0x10000);
1446         }
1447
1448         if (crd != 0)
1449                 card_ptr[crd] = card_ptr[crd-1] + boards[crd-1].numports;
1450         else
1451                 card_ptr[crd] = &digi_channels[crd]; /* <- For card 0 only */
1452
1453         ch = card_ptr[crd];
1454         epcaassert(ch <= &digi_channels[nbdevs - 1], "ch out of range");
1455
1456         memaddr = bd->re_map_membase;
1457
1458         /* -----------------------------------------------------------------
1459                 The below assignment will set bc to point at the BEGINING of
1460                 the cards channel structures.  For 1 card there will be between
1461                 8 and 64 of these structures.
1462         -------------------------------------------------------------------- */
1463
1464         bc = memaddr + CHANSTRUCT;
1465
1466         /* -------------------------------------------------------------------
1467                 The below assignment will set gd to point at the BEGINING of
1468                 global memory address 0xc00.  The first data in that global
1469                 memory actually starts at address 0xc1a.  The command in
1470                 pointer begins at 0xd10.
1471         ---------------------------------------------------------------------- */
1472
1473         gd = memaddr + GLOBAL;
1474
1475         /* --------------------------------------------------------------------
1476                 XEPORTS (address 0xc22) points at the number of channels the
1477                 card supports. (For 64XE, XI, XEM, and XR use 0xc02)
1478         ----------------------------------------------------------------------- */
1479
1480         if ((bd->type == PCXEVE || bd->type == PCXE) && (readw(memaddr + XEPORTS) < 3))
1481                 shrinkmem = 1;
1482         if (bd->type < PCIXEM)
1483                 if (!request_region((int)bd->port, 4, board_desc[bd->type]))
1484                         return;
1485         memwinon(bd, 0);
1486
1487         /*  --------------------------------------------------------------------
1488                 Remember ch is the main drivers channels structure, while bc is
1489            the cards channel structure.
1490         ------------------------------------------------------------------------ */
1491
1492         /* For every port on the card do ..... */
1493
1494         for (i = 0; i < bd->numports; i++, ch++, bc++)  { /* Begin for each port */
1495                 unsigned long flags;
1496                 u16 tseg, rseg;
1497
1498                 ch->brdchan        = bc;
1499                 ch->mailbox        = gd;
1500                 INIT_WORK(&ch->tqueue, do_softint, ch);
1501                 ch->board          = &boards[crd];
1502
1503                 spin_lock_irqsave(&epca_lock, flags);
1504                 switch (bd->type) {
1505                         /* ----------------------------------------------------------------
1506                                 Since some of the boards use different bitmaps for their
1507                                 control signals we cannot hard code these values and retain
1508                                 portability.  We virtualize this data here.
1509                         ------------------------------------------------------------------- */
1510                         case EISAXEM:
1511                         case PCXEM:
1512                         case PCIXEM:
1513                         case PCIXRJ:
1514                         case PCIXR:
1515                                 ch->m_rts = 0x02 ;
1516                                 ch->m_dcd = 0x80 ;
1517                                 ch->m_dsr = 0x20 ;
1518                                 ch->m_cts = 0x10 ;
1519                                 ch->m_ri  = 0x40 ;
1520                                 ch->m_dtr = 0x01 ;
1521                                 break;
1522
1523                         case PCXE:
1524                         case PCXEVE:
1525                         case PCXI:
1526                         case PC64XE:
1527                                 ch->m_rts = 0x02 ;
1528                                 ch->m_dcd = 0x08 ;
1529                                 ch->m_dsr = 0x10 ;
1530                                 ch->m_cts = 0x20 ;
1531                                 ch->m_ri  = 0x40 ;
1532                                 ch->m_dtr = 0x80 ;
1533                                 break;
1534
1535                 } /* End switch bd->type */
1536
1537                 if (boards[crd].altpin) {
1538                         ch->dsr = ch->m_dcd;
1539                         ch->dcd = ch->m_dsr;
1540                         ch->digiext.digi_flags |= DIGI_ALTPIN;
1541                 }
1542                 else {
1543                         ch->dcd = ch->m_dcd;
1544                         ch->dsr = ch->m_dsr;
1545                 }
1546
1547                 ch->boardnum   = crd;
1548                 ch->channelnum = i;
1549                 ch->magic      = EPCA_MAGIC;
1550                 ch->tty        = NULL;
1551
1552                 if (shrinkmem) {
1553                         fepcmd(ch, SETBUFFER, 32, 0, 0, 0);
1554                         shrinkmem = 0;
1555                 }
1556
1557                 tseg = readw(&bc->tseg);
1558                 rseg = readw(&bc->rseg);
1559
1560                 switch (bd->type) {
1561
1562                         case PCIXEM:
1563                         case PCIXRJ:
1564                         case PCIXR:
1565                                 /* Cover all the 2MEG cards */
1566                                 ch->txptr = memaddr + ((tseg << 4) & 0x1fffff);
1567                                 ch->rxptr = memaddr + ((rseg << 4) & 0x1fffff);
1568                                 ch->txwin = FEPWIN | (tseg >> 11);
1569                                 ch->rxwin = FEPWIN | (rseg >> 11);
1570                                 break;
1571
1572                         case PCXEM:
1573                         case EISAXEM:
1574                                 /* Cover all the 32K windowed cards */
1575                                 /* Mask equal to window size - 1 */
1576                                 ch->txptr = memaddr + ((tseg << 4) & 0x7fff);
1577                                 ch->rxptr = memaddr + ((rseg << 4) & 0x7fff);
1578                                 ch->txwin = FEPWIN | (tseg >> 11);
1579                                 ch->rxwin = FEPWIN | (rseg >> 11);
1580                                 break;
1581
1582                         case PCXEVE:
1583                         case PCXE:
1584                                 ch->txptr = memaddr + (((tseg - bd->memory_seg) << 4) & 0x1fff);
1585                                 ch->txwin = FEPWIN | ((tseg - bd->memory_seg) >> 9);
1586                                 ch->rxptr = memaddr + (((rseg - bd->memory_seg) << 4) & 0x1fff);
1587                                 ch->rxwin = FEPWIN | ((rseg - bd->memory_seg) >>9 );
1588                                 break;
1589
1590                         case PCXI:
1591                         case PC64XE:
1592                                 ch->txptr = memaddr + ((tseg - bd->memory_seg) << 4);
1593                                 ch->rxptr = memaddr + ((rseg - bd->memory_seg) << 4);
1594                                 ch->txwin = ch->rxwin = 0;
1595                                 break;
1596
1597                 } /* End switch bd->type */
1598
1599                 ch->txbufhead = 0;
1600                 ch->txbufsize = readw(&bc->tmax) + 1;
1601
1602                 ch->rxbufhead = 0;
1603                 ch->rxbufsize = readw(&bc->rmax) + 1;
1604
1605                 lowwater = ch->txbufsize >= 2000 ? 1024 : (ch->txbufsize / 2);
1606
1607                 /* Set transmitter low water mark */
1608                 fepcmd(ch, STXLWATER, lowwater, 0, 10, 0);
1609
1610                 /* Set receiver low water mark */
1611
1612                 fepcmd(ch, SRXLWATER, (ch->rxbufsize / 4), 0, 10, 0);
1613
1614                 /* Set receiver high water mark */
1615
1616                 fepcmd(ch, SRXHWATER, (3 * ch->rxbufsize / 4), 0, 10, 0);
1617
1618                 writew(100, &bc->edelay);
1619                 writeb(1, &bc->idata);
1620
1621                 ch->startc  = readb(&bc->startc);
1622                 ch->stopc   = readb(&bc->stopc);
1623                 ch->startca = readb(&bc->startca);
1624                 ch->stopca  = readb(&bc->stopca);
1625
1626                 ch->fepcflag = 0;
1627                 ch->fepiflag = 0;
1628                 ch->fepoflag = 0;
1629                 ch->fepstartc = 0;
1630                 ch->fepstopc = 0;
1631                 ch->fepstartca = 0;
1632                 ch->fepstopca = 0;
1633
1634                 ch->close_delay = 50;
1635                 ch->count = 0;
1636                 ch->blocked_open = 0;
1637                 init_waitqueue_head(&ch->open_wait);
1638                 init_waitqueue_head(&ch->close_wait);
1639
1640                 spin_unlock_irqrestore(&epca_lock, flags);
1641
1642                 ch->tmp_buf = kmalloc(ch->txbufsize,GFP_KERNEL);
1643                 if (!ch->tmp_buf) {
1644                         printk(KERN_ERR "POST FEP INIT : kmalloc failed for port 0x%x\n",i);
1645                         release_region((int)bd->port, 4);
1646                         while(i-- > 0)
1647                                 kfree((ch--)->tmp_buf);
1648                         return;
1649                 } else
1650                         memset((void *)ch->tmp_buf,0,ch->txbufsize);
1651         } /* End for each port */
1652
1653         printk(KERN_INFO
1654                 "Digi PC/Xx Driver V%s:  %s I/O = 0x%lx Mem = 0x%lx Ports = %d\n",
1655                 VERSION, board_desc[bd->type], (long)bd->port, (long)bd->membase, bd->numports);
1656         memwinoff(bd, 0);
1657
1658 } /* End post_fep_init */
1659
1660 /* --------------------- Begin epcapoll  ------------------------ */
1661
1662 static void epcapoll(unsigned long ignored)
1663 { /* Begin epcapoll */
1664
1665         unsigned long flags;
1666         int crd;
1667         volatile unsigned int head, tail;
1668         struct channel *ch;
1669         struct board_info *bd;
1670
1671         /* -------------------------------------------------------------------
1672                 This routine is called upon every timer interrupt.  Even though
1673                 the Digi series cards are capable of generating interrupts this
1674                 method of non-looping polling is more efficient.  This routine
1675                 checks for card generated events (Such as receive data, are transmit
1676                 buffer empty) and acts on those events.
1677         ----------------------------------------------------------------------- */
1678
1679         for (crd = 0; crd < num_cards; crd++)
1680         { /* Begin for each card */
1681
1682                 bd = &boards[crd];
1683                 ch = card_ptr[crd];
1684
1685                 if ((bd->status == DISABLED) || digi_poller_inhibited)
1686                         continue; /* Begin loop next interation */
1687
1688                 /* -----------------------------------------------------------
1689                         assertmemoff is not needed here; indeed it is an empty subroutine.
1690                         It is being kept because future boards may need this as well as
1691                         some legacy boards.
1692                 ---------------------------------------------------------------- */
1693
1694                 spin_lock_irqsave(&epca_lock, flags);
1695
1696                 assertmemoff(ch);
1697
1698                 globalwinon(ch);
1699
1700                 /* ---------------------------------------------------------------
1701                         In this case head and tail actually refer to the event queue not
1702                         the transmit or receive queue.
1703                 ------------------------------------------------------------------- */
1704
1705                 head = readw(&ch->mailbox->ein);
1706                 tail = readw(&ch->mailbox->eout);
1707
1708                 /* If head isn't equal to tail we have an event */
1709
1710                 if (head != tail)
1711                         doevent(crd);
1712                 memoff(ch);
1713
1714                 spin_unlock_irqrestore(&epca_lock, flags);
1715
1716         } /* End for each card */
1717         mod_timer(&epca_timer, jiffies + (HZ / 25));
1718 } /* End epcapoll */
1719
1720 /* --------------------- Begin doevent  ------------------------ */
1721
1722 static void doevent(int crd)
1723 { /* Begin doevent */
1724
1725         void __iomem *eventbuf;
1726         struct channel *ch, *chan0;
1727         static struct tty_struct *tty;
1728         struct board_info *bd;
1729         struct board_chan __iomem *bc;
1730         unsigned int tail, head;
1731         int event, channel;
1732         int mstat, lstat;
1733
1734         /* -------------------------------------------------------------------
1735                 This subroutine is called by epcapoll when an event is detected
1736                 in the event queue.  This routine responds to those events.
1737         --------------------------------------------------------------------- */
1738         bd = &boards[crd];
1739
1740         chan0 = card_ptr[crd];
1741         epcaassert(chan0 <= &digi_channels[nbdevs - 1], "ch out of range");
1742         assertgwinon(chan0);
1743         while ((tail = readw(&chan0->mailbox->eout)) != (head = readw(&chan0->mailbox->ein)))
1744         { /* Begin while something in event queue */
1745                 assertgwinon(chan0);
1746                 eventbuf = bd->re_map_membase + tail + ISTART;
1747                 /* Get the channel the event occurred on */
1748                 channel = readb(eventbuf);
1749                 /* Get the actual event code that occurred */
1750                 event = readb(eventbuf + 1);
1751                 /*  ----------------------------------------------------------------
1752                         The two assignments below get the current modem status (mstat)
1753                         and the previous modem status (lstat).  These are useful becuase
1754                         an event could signal a change in modem signals itself.
1755                 ------------------------------------------------------------------- */
1756                 mstat = readb(eventbuf + 2);
1757                 lstat = readb(eventbuf + 3);
1758
1759                 ch = chan0 + channel;
1760                 if ((unsigned)channel >= bd->numports || !ch)  {
1761                         if (channel >= bd->numports)
1762                                 ch = chan0;
1763                         bc = ch->brdchan;
1764                         goto next;
1765                 }
1766
1767                 if ((bc = ch->brdchan) == NULL)
1768                         goto next;
1769
1770                 if (event & DATA_IND)  { /* Begin DATA_IND */
1771                         receive_data(ch);
1772                         assertgwinon(ch);
1773                 } /* End DATA_IND */
1774                 /* else *//* Fix for DCD transition missed bug */
1775                 if (event & MODEMCHG_IND)  { /* Begin MODEMCHG_IND */
1776                         /* A modem signal change has been indicated */
1777                         ch->imodem = mstat;
1778                         if (ch->asyncflags & ASYNC_CHECK_CD)  {
1779                                 if (mstat & ch->dcd)  /* We are now receiving dcd */
1780                                         wake_up_interruptible(&ch->open_wait);
1781                                 else
1782                                         pc_sched_event(ch, EPCA_EVENT_HANGUP); /* No dcd; hangup */
1783                         }
1784                 } /* End MODEMCHG_IND */
1785                 tty = ch->tty;
1786                 if (tty)  { /* Begin if valid tty */
1787                         if (event & BREAK_IND)  { /* Begin if BREAK_IND */
1788                                 /* A break has been indicated */
1789                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
1790                                 tty_schedule_flip(tty);
1791                         } else if (event & LOWTX_IND)  { /* Begin LOWTX_IND */
1792                                 if (ch->statusflags & LOWWAIT)
1793                                 { /* Begin if LOWWAIT */
1794                                         ch->statusflags &= ~LOWWAIT;
1795                                         tty_wakeup(tty);
1796                                         wake_up_interruptible(&tty->write_wait);
1797                                 } /* End if LOWWAIT */
1798                         } else if (event & EMPTYTX_IND)  { /* Begin EMPTYTX_IND */
1799                                 /* This event is generated by setup_empty_event */
1800                                 ch->statusflags &= ~TXBUSY;
1801                                 if (ch->statusflags & EMPTYWAIT)  { /* Begin if EMPTYWAIT */
1802                                         ch->statusflags &= ~EMPTYWAIT;
1803                                         tty_wakeup(tty);
1804                                         wake_up_interruptible(&tty->write_wait);
1805                                 } /* End if EMPTYWAIT */
1806                         } /* End EMPTYTX_IND */
1807                 } /* End if valid tty */
1808         next:
1809                 globalwinon(ch);
1810                 BUG_ON(!bc);
1811                 writew(1, &bc->idata);
1812                 writew((tail + 4) & (IMAX - ISTART - 4), &chan0->mailbox->eout);
1813                 globalwinon(chan0);
1814         } /* End while something in event queue */
1815 } /* End doevent */
1816
1817 /* --------------------- Begin fepcmd  ------------------------ */
1818
1819 static void fepcmd(struct channel *ch, int cmd, int word_or_byte,
1820                    int byte2, int ncmds, int bytecmd)
1821 { /* Begin fepcmd */
1822         unchar __iomem *memaddr;
1823         unsigned int head, cmdTail, cmdStart, cmdMax;
1824         long count;
1825         int n;
1826
1827         /* This is the routine in which commands may be passed to the card. */
1828
1829         if (ch->board->status == DISABLED)
1830                 return;
1831         assertgwinon(ch);
1832         /* Remember head (As well as max) is just an offset not a base addr */
1833         head = readw(&ch->mailbox->cin);
1834         /* cmdStart is a base address */
1835         cmdStart = readw(&ch->mailbox->cstart);
1836         /* ------------------------------------------------------------------
1837                 We do the addition below because we do not want a max pointer
1838                 relative to cmdStart.  We want a max pointer that points at the
1839                 physical end of the command queue.
1840         -------------------------------------------------------------------- */
1841         cmdMax = (cmdStart + 4 + readw(&ch->mailbox->cmax));
1842         memaddr = ch->board->re_map_membase;
1843
1844         if (head >= (cmdMax - cmdStart) || (head & 03))  {
1845                 printk(KERN_ERR "line %d: Out of range, cmd = %x, head = %x\n", __LINE__,  cmd, head);
1846                 printk(KERN_ERR "line %d: Out of range, cmdMax = %x, cmdStart = %x\n", __LINE__,  cmdMax, cmdStart);
1847                 return;
1848         }
1849         if (bytecmd)  {
1850                 writeb(cmd, memaddr + head + cmdStart + 0);
1851                 writeb(ch->channelnum,  memaddr + head + cmdStart + 1);
1852                 /* Below word_or_byte is bits to set */
1853                 writeb(word_or_byte,  memaddr + head + cmdStart + 2);
1854                 /* Below byte2 is bits to reset */
1855                 writeb(byte2, memaddr + head + cmdStart + 3);
1856         }  else {
1857                 writeb(cmd, memaddr + head + cmdStart + 0);
1858                 writeb(ch->channelnum,  memaddr + head + cmdStart + 1);
1859                 writeb(word_or_byte,  memaddr + head + cmdStart + 2);
1860         }
1861         head = (head + 4) & (cmdMax - cmdStart - 4);
1862         writew(head, &ch->mailbox->cin);
1863         count = FEPTIMEOUT;
1864
1865         for (;;)  { /* Begin forever loop */
1866                 count--;
1867                 if (count == 0)  {
1868                         printk(KERN_ERR "<Error> - Fep not responding in fepcmd()\n");
1869                         return;
1870                 }
1871                 head = readw(&ch->mailbox->cin);
1872                 cmdTail = readw(&ch->mailbox->cout);
1873                 n = (head - cmdTail) & (cmdMax - cmdStart - 4);
1874                 /* ----------------------------------------------------------
1875                         Basically this will break when the FEP acknowledges the
1876                         command by incrementing cmdTail (Making it equal to head).
1877                 ------------------------------------------------------------- */
1878                 if (n <= ncmds * (sizeof(short) * 4))
1879                         break; /* Well nearly forever :-) */
1880         } /* End forever loop */
1881 } /* End fepcmd */
1882
1883 /* ---------------------------------------------------------------------
1884         Digi products use fields in their channels structures that are very
1885         similar to the c_cflag and c_iflag fields typically found in UNIX
1886         termios structures.  The below three routines allow mappings
1887         between these hardware "flags" and their respective Linux flags.
1888 ------------------------------------------------------------------------- */
1889
1890 /* --------------------- Begin termios2digi_h -------------------- */
1891
1892 static unsigned termios2digi_h(struct channel *ch, unsigned cflag)
1893 { /* Begin termios2digi_h */
1894         unsigned res = 0;
1895
1896         if (cflag & CRTSCTS) {
1897                 ch->digiext.digi_flags |= (RTSPACE | CTSPACE);
1898                 res |= ((ch->m_cts) | (ch->m_rts));
1899         }
1900
1901         if (ch->digiext.digi_flags & RTSPACE)
1902                 res |= ch->m_rts;
1903
1904         if (ch->digiext.digi_flags & DTRPACE)
1905                 res |= ch->m_dtr;
1906
1907         if (ch->digiext.digi_flags & CTSPACE)
1908                 res |= ch->m_cts;
1909
1910         if (ch->digiext.digi_flags & DSRPACE)
1911                 res |= ch->dsr;
1912
1913         if (ch->digiext.digi_flags & DCDPACE)
1914                 res |= ch->dcd;
1915
1916         if (res & (ch->m_rts))
1917                 ch->digiext.digi_flags |= RTSPACE;
1918
1919         if (res & (ch->m_cts))
1920                 ch->digiext.digi_flags |= CTSPACE;
1921
1922         return res;
1923
1924 } /* End termios2digi_h */
1925
1926 /* --------------------- Begin termios2digi_i -------------------- */
1927 static unsigned termios2digi_i(struct channel *ch, unsigned iflag)
1928 { /* Begin termios2digi_i */
1929
1930         unsigned res = iflag & (IGNBRK | BRKINT | IGNPAR | PARMRK |
1931                                 INPCK | ISTRIP|IXON|IXANY|IXOFF);
1932         if (ch->digiext.digi_flags & DIGI_AIXON)
1933                 res |= IAIXON;
1934         return res;
1935
1936 } /* End termios2digi_i */
1937
1938 /* --------------------- Begin termios2digi_c -------------------- */
1939
1940 static unsigned termios2digi_c(struct channel *ch, unsigned cflag)
1941 { /* Begin termios2digi_c */
1942
1943         unsigned res = 0;
1944         if (cflag & CBAUDEX) { /* Begin detected CBAUDEX */
1945                 ch->digiext.digi_flags |= DIGI_FAST;
1946                 /* -------------------------------------------------------------
1947                    HUPCL bit is used by FEP to indicate fast baud
1948                    table is to be used.
1949                 ----------------------------------------------------------------- */
1950                 res |= FEP_HUPCL;
1951         } /* End detected CBAUDEX */
1952         else ch->digiext.digi_flags &= ~DIGI_FAST;
1953         /* -------------------------------------------------------------------
1954                 CBAUD has bit position 0x1000 set these days to indicate Linux
1955                 baud rate remap.  Digi hardware can't handle the bit assignment.
1956                 (We use a different bit assignment for high speed.).  Clear this
1957                 bit out.
1958         ---------------------------------------------------------------------- */
1959         res |= cflag & ((CBAUD ^ CBAUDEX) | PARODD | PARENB | CSTOPB | CSIZE);
1960         /* -------------------------------------------------------------
1961                 This gets a little confusing.  The Digi cards have their own
1962                 representation of c_cflags controling baud rate.  For the most
1963                 part this is identical to the Linux implementation.  However;
1964                 Digi supports one rate (76800) that Linux doesn't.  This means
1965                 that the c_cflag entry that would normally mean 76800 for Digi
1966                 actually means 115200 under Linux.  Without the below mapping,
1967                 a stty 115200 would only drive the board at 76800.  Since
1968                 the rate 230400 is also found after 76800, the same problem afflicts
1969                 us when we choose a rate of 230400.  Without the below modificiation
1970                 stty 230400 would actually give us 115200.
1971
1972                 There are two additional differences.  The Linux value for CLOCAL
1973                 (0x800; 0004000) has no meaning to the Digi hardware.  Also in
1974                 later releases of Linux; the CBAUD define has CBAUDEX (0x1000;
1975                 0010000) ored into it (CBAUD = 0x100f as opposed to 0xf). CBAUDEX
1976                 should be checked for a screened out prior to termios2digi_c
1977                 returning.  Since CLOCAL isn't used by the board this can be
1978                 ignored as long as the returned value is used only by Digi hardware.
1979                 ----------------------------------------------------------------- */
1980         if (cflag & CBAUDEX) {
1981                 /* -------------------------------------------------------------
1982                         The below code is trying to guarantee that only baud rates
1983                         115200 and 230400 are remapped.  We use exclusive or because
1984                         the various baud rates share common bit positions and therefore
1985                         can't be tested for easily.
1986                 ----------------------------------------------------------------- */
1987
1988
1989                 if ((!((cflag & 0x7) ^ (B115200 & ~CBAUDEX))) ||
1990                     (!((cflag & 0x7) ^ (B230400 & ~CBAUDEX))))
1991                         res += 1;
1992         }
1993         return res;
1994
1995 } /* End termios2digi_c */
1996
1997 /* --------------------- Begin epcaparam  ----------------------- */
1998
1999 /* Caller must hold the locks */
2000 static void epcaparam(struct tty_struct *tty, struct channel *ch)
2001 { /* Begin epcaparam */
2002
2003         unsigned int cmdHead;
2004         struct termios *ts;
2005         struct board_chan __iomem *bc;
2006         unsigned mval, hflow, cflag, iflag;
2007
2008         bc = ch->brdchan;
2009         epcaassert(bc !=0, "bc out of range");
2010
2011         assertgwinon(ch);
2012         ts = tty->termios;
2013         if ((ts->c_cflag & CBAUD) == 0)  { /* Begin CBAUD detected */
2014                 cmdHead = readw(&bc->rin);
2015                 writew(cmdHead, &bc->rout);
2016                 cmdHead = readw(&bc->tin);
2017                 /* Changing baud in mid-stream transmission can be wonderful */
2018                 /* ---------------------------------------------------------------
2019                         Flush current transmit buffer by setting cmdTail pointer (tout)
2020                         to cmdHead pointer (tin).  Hopefully the transmit buffer is empty.
2021                 ----------------------------------------------------------------- */
2022                 fepcmd(ch, STOUT, (unsigned) cmdHead, 0, 0, 0);
2023                 mval = 0;
2024         } else  { /* Begin CBAUD not detected */
2025                 /* -------------------------------------------------------------------
2026                         c_cflags have changed but that change had nothing to do with BAUD.
2027                         Propagate the change to the card.
2028                 ---------------------------------------------------------------------- */
2029                 cflag = termios2digi_c(ch, ts->c_cflag);
2030                 if (cflag != ch->fepcflag)  {
2031                         ch->fepcflag = cflag;
2032                         /* Set baud rate, char size, stop bits, parity */
2033                         fepcmd(ch, SETCTRLFLAGS, (unsigned) cflag, 0, 0, 0);
2034                 }
2035                 /* ----------------------------------------------------------------
2036                         If the user has not forced CLOCAL and if the device is not a
2037                         CALLOUT device (Which is always CLOCAL) we set flags such that
2038                         the driver will wait on carrier detect.
2039                 ------------------------------------------------------------------- */
2040                 if (ts->c_cflag & CLOCAL)
2041                         ch->asyncflags &= ~ASYNC_CHECK_CD;
2042                 else
2043                         ch->asyncflags |= ASYNC_CHECK_CD;
2044                 mval = ch->m_dtr | ch->m_rts;
2045         } /* End CBAUD not detected */
2046         iflag = termios2digi_i(ch, ts->c_iflag);
2047         /* Check input mode flags */
2048         if (iflag != ch->fepiflag)  {
2049                 ch->fepiflag = iflag;
2050                 /* ---------------------------------------------------------------
2051                         Command sets channels iflag structure on the board. Such things
2052                         as input soft flow control, handling of parity errors, and
2053                         break handling are all set here.
2054                 ------------------------------------------------------------------- */
2055                 /* break handling, parity handling, input stripping, flow control chars */
2056                 fepcmd(ch, SETIFLAGS, (unsigned int) ch->fepiflag, 0, 0, 0);
2057         }
2058         /* ---------------------------------------------------------------
2059                 Set the board mint value for this channel.  This will cause hardware
2060                 events to be generated each time the DCD signal (Described in mint)
2061                 changes.
2062         ------------------------------------------------------------------- */
2063         writeb(ch->dcd, &bc->mint);
2064         if ((ts->c_cflag & CLOCAL) || (ch->digiext.digi_flags & DIGI_FORCEDCD))
2065                 if (ch->digiext.digi_flags & DIGI_FORCEDCD)
2066                         writeb(0, &bc->mint);
2067         ch->imodem = readb(&bc->mstat);
2068         hflow = termios2digi_h(ch, ts->c_cflag);
2069         if (hflow != ch->hflow)  {
2070                 ch->hflow = hflow;
2071                 /* --------------------------------------------------------------
2072                         Hard flow control has been selected but the board is not
2073                         using it.  Activate hard flow control now.
2074                 ----------------------------------------------------------------- */
2075                 fepcmd(ch, SETHFLOW, hflow, 0xff, 0, 1);
2076         }
2077         mval ^= ch->modemfake & (mval ^ ch->modem);
2078
2079         if (ch->omodem ^ mval)  {
2080                 ch->omodem = mval;
2081                 /* --------------------------------------------------------------
2082                         The below command sets the DTR and RTS mstat structure.  If
2083                         hard flow control is NOT active these changes will drive the
2084                         output of the actual DTR and RTS lines.  If hard flow control
2085                         is active, the changes will be saved in the mstat structure and
2086                         only asserted when hard flow control is turned off.
2087                 ----------------------------------------------------------------- */
2088
2089                 /* First reset DTR & RTS; then set them */
2090                 fepcmd(ch, SETMODEM, 0, ((ch->m_dtr)|(ch->m_rts)), 0, 1);
2091                 fepcmd(ch, SETMODEM, mval, 0, 0, 1);
2092         }
2093         if (ch->startc != ch->fepstartc || ch->stopc != ch->fepstopc)  {
2094                 ch->fepstartc = ch->startc;
2095                 ch->fepstopc = ch->stopc;
2096                 /* ------------------------------------------------------------
2097                         The XON / XOFF characters have changed; propagate these
2098                         changes to the card.
2099                 --------------------------------------------------------------- */
2100                 fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
2101         }
2102         if (ch->startca != ch->fepstartca || ch->stopca != ch->fepstopca)  {
2103                 ch->fepstartca = ch->startca;
2104                 ch->fepstopca = ch->stopca;
2105                 /* ---------------------------------------------------------------
2106                         Similar to the above, this time the auxilarly XON / XOFF
2107                         characters have changed; propagate these changes to the card.
2108                 ------------------------------------------------------------------ */
2109                 fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
2110         }
2111 } /* End epcaparam */
2112
2113 /* --------------------- Begin receive_data  ----------------------- */
2114 /* Caller holds lock */
2115 static void receive_data(struct channel *ch)
2116 { /* Begin receive_data */
2117
2118         unchar *rptr;
2119         struct termios *ts = NULL;
2120         struct tty_struct *tty;
2121         struct board_chan __iomem *bc;
2122         int dataToRead, wrapgap, bytesAvailable;
2123         unsigned int tail, head;
2124         unsigned int wrapmask;
2125
2126         /* ---------------------------------------------------------------
2127                 This routine is called by doint when a receive data event
2128                 has taken place.
2129         ------------------------------------------------------------------- */
2130
2131         globalwinon(ch);
2132         if (ch->statusflags & RXSTOPPED)
2133                 return;
2134         tty = ch->tty;
2135         if (tty)
2136                 ts = tty->termios;
2137         bc = ch->brdchan;
2138         BUG_ON(!bc);
2139         wrapmask = ch->rxbufsize - 1;
2140
2141         /* ---------------------------------------------------------------------
2142                 Get the head and tail pointers to the receiver queue.  Wrap the
2143                 head pointer if it has reached the end of the buffer.
2144         ------------------------------------------------------------------------ */
2145         head = readw(&bc->rin);
2146         head &= wrapmask;
2147         tail = readw(&bc->rout) & wrapmask;
2148
2149         bytesAvailable = (head - tail) & wrapmask;
2150         if (bytesAvailable == 0)
2151                 return;
2152
2153         /* ------------------------------------------------------------------
2154            If CREAD bit is off or device not open, set TX tail to head
2155         --------------------------------------------------------------------- */
2156
2157         if (!tty || !ts || !(ts->c_cflag & CREAD))  {
2158                 writew(head, &bc->rout);
2159                 return;
2160         }
2161
2162         if (tty_buffer_request_room(tty, bytesAvailable + 1) == 0)
2163                 return;
2164
2165         if (readb(&bc->orun)) {
2166                 writeb(0, &bc->orun);
2167                 printk(KERN_WARNING "epca; overrun! DigiBoard device %s\n",tty->name);
2168                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2169         }
2170         rxwinon(ch);
2171         while (bytesAvailable > 0)  { /* Begin while there is data on the card */
2172                 wrapgap = (head >= tail) ? head - tail : ch->rxbufsize - tail;
2173                 /* ---------------------------------------------------------------
2174                         Even if head has wrapped around only report the amount of
2175                         data to be equal to the size - tail.  Remember memcpy can't
2176                         automaticly wrap around the receive buffer.
2177                 ----------------------------------------------------------------- */
2178                 dataToRead = (wrapgap < bytesAvailable) ? wrapgap : bytesAvailable;
2179                 /* --------------------------------------------------------------
2180                    Make sure we don't overflow the buffer
2181                 ----------------------------------------------------------------- */
2182                 dataToRead = tty_prepare_flip_string(tty, &rptr, dataToRead);
2183                 if (dataToRead == 0)
2184                         break;
2185                 /* ---------------------------------------------------------------
2186                         Move data read from our card into the line disciplines buffer
2187                         for translation if necessary.
2188                 ------------------------------------------------------------------ */
2189                 memcpy_fromio(rptr, ch->rxptr + tail, dataToRead);
2190                 tail = (tail + dataToRead) & wrapmask;
2191                 bytesAvailable -= dataToRead;
2192         } /* End while there is data on the card */
2193         globalwinon(ch);
2194         writew(tail, &bc->rout);
2195         /* Must be called with global data */
2196         tty_schedule_flip(ch->tty);
2197         return;
2198 } /* End receive_data */
2199
2200 static int info_ioctl(struct tty_struct *tty, struct file * file,
2201                     unsigned int cmd, unsigned long arg)
2202 {
2203         switch (cmd)
2204         { /* Begin switch cmd */
2205                 case DIGI_GETINFO:
2206                 { /* Begin case DIGI_GETINFO */
2207                         struct digi_info di ;
2208                         int brd;
2209
2210                         if(get_user(brd, (unsigned int __user *)arg))
2211                                 return -EFAULT;
2212                         if (brd < 0 || brd >= num_cards || num_cards == 0)
2213                                 return -ENODEV;
2214
2215                         memset(&di, 0, sizeof(di));
2216
2217                         di.board = brd ;
2218                         di.status = boards[brd].status;
2219                         di.type = boards[brd].type ;
2220                         di.numports = boards[brd].numports ;
2221                         /* Legacy fixups - just move along nothing to see */
2222                         di.port = (unsigned char *)boards[brd].port ;
2223                         di.membase = (unsigned char *)boards[brd].membase ;
2224
2225                         if (copy_to_user((void __user *)arg, &di, sizeof (di)))
2226                                 return -EFAULT;
2227                         break;
2228
2229                 } /* End case DIGI_GETINFO */
2230
2231                 case DIGI_POLLER:
2232                 { /* Begin case DIGI_POLLER */
2233
2234                         int brd = arg & 0xff000000 >> 16 ;
2235                         unsigned char state = arg & 0xff ;
2236
2237                         if (brd < 0 || brd >= num_cards) {
2238                                 printk(KERN_ERR "epca: DIGI POLLER : brd not valid!\n");
2239                                 return (-ENODEV);
2240                         }
2241                         digi_poller_inhibited = state ;
2242                         break ;
2243                 } /* End case DIGI_POLLER */
2244
2245                 case DIGI_INIT:
2246                 { /* Begin case DIGI_INIT */
2247                         /* ------------------------------------------------------------
2248                                 This call is made by the apps to complete the initilization
2249                                 of the board(s).  This routine is responsible for setting
2250                                 the card to its initial state and setting the drivers control
2251                                 fields to the sutianle settings for the card in question.
2252                         ---------------------------------------------------------------- */
2253                         int crd ;
2254                         for (crd = 0; crd < num_cards; crd++)
2255                                 post_fep_init (crd);
2256                         break ;
2257                 } /* End case DIGI_INIT */
2258                 default:
2259                         return -ENOTTY;
2260         } /* End switch cmd */
2261         return (0) ;
2262 }
2263 /* --------------------- Begin pc_ioctl  ----------------------- */
2264
2265 static int pc_tiocmget(struct tty_struct *tty, struct file *file)
2266 {
2267         struct channel *ch = (struct channel *) tty->driver_data;
2268         struct board_chan __iomem *bc;
2269         unsigned int mstat, mflag = 0;
2270         unsigned long flags;
2271
2272         if (ch)
2273                 bc = ch->brdchan;
2274         else
2275                 return -EINVAL;
2276
2277         spin_lock_irqsave(&epca_lock, flags);
2278         globalwinon(ch);
2279         mstat = readb(&bc->mstat);
2280         memoff(ch);
2281         spin_unlock_irqrestore(&epca_lock, flags);
2282
2283         if (mstat & ch->m_dtr)
2284                 mflag |= TIOCM_DTR;
2285         if (mstat & ch->m_rts)
2286                 mflag |= TIOCM_RTS;
2287         if (mstat & ch->m_cts)
2288                 mflag |= TIOCM_CTS;
2289         if (mstat & ch->dsr)
2290                 mflag |= TIOCM_DSR;
2291         if (mstat & ch->m_ri)
2292                 mflag |= TIOCM_RI;
2293         if (mstat & ch->dcd)
2294                 mflag |= TIOCM_CD;
2295         return mflag;
2296 }
2297
2298 static int pc_tiocmset(struct tty_struct *tty, struct file *file,
2299                        unsigned int set, unsigned int clear)
2300 {
2301         struct channel *ch = (struct channel *) tty->driver_data;
2302         unsigned long flags;
2303
2304         if (!ch)
2305                 return -EINVAL;
2306
2307         spin_lock_irqsave(&epca_lock, flags);
2308         /*
2309          * I think this modemfake stuff is broken.  It doesn't
2310          * correctly reflect the behaviour desired by the TIOCM*
2311          * ioctls.  Therefore this is probably broken.
2312          */
2313         if (set & TIOCM_RTS) {
2314                 ch->modemfake |= ch->m_rts;
2315                 ch->modem |= ch->m_rts;
2316         }
2317         if (set & TIOCM_DTR) {
2318                 ch->modemfake |= ch->m_dtr;
2319                 ch->modem |= ch->m_dtr;
2320         }
2321         if (clear & TIOCM_RTS) {
2322                 ch->modemfake |= ch->m_rts;
2323                 ch->modem &= ~ch->m_rts;
2324         }
2325         if (clear & TIOCM_DTR) {
2326                 ch->modemfake |= ch->m_dtr;
2327                 ch->modem &= ~ch->m_dtr;
2328         }
2329         globalwinon(ch);
2330         /*  --------------------------------------------------------------
2331                 The below routine generally sets up parity, baud, flow control
2332                 issues, etc.... It effect both control flags and input flags.
2333         ------------------------------------------------------------------ */
2334         epcaparam(tty,ch);
2335         memoff(ch);
2336         spin_unlock_irqrestore(&epca_lock, flags);
2337         return 0;
2338 }
2339
2340 static int pc_ioctl(struct tty_struct *tty, struct file * file,
2341                     unsigned int cmd, unsigned long arg)
2342 { /* Begin pc_ioctl */
2343
2344         digiflow_t dflow;
2345         int retval;
2346         unsigned long flags;
2347         unsigned int mflag, mstat;
2348         unsigned char startc, stopc;
2349         struct board_chan __iomem *bc;
2350         struct channel *ch = (struct channel *) tty->driver_data;
2351         void __user *argp = (void __user *)arg;
2352
2353         if (ch)
2354                 bc = ch->brdchan;
2355         else
2356                 return -EINVAL;
2357
2358         /* -------------------------------------------------------------------
2359                 For POSIX compliance we need to add more ioctls.  See tty_ioctl.c
2360                 in /usr/src/linux/drivers/char for a good example.  In particular
2361                 think about adding TCSETAF, TCSETAW, TCSETA, TCSETSF, TCSETSW, TCSETS.
2362         ---------------------------------------------------------------------- */
2363
2364         switch (cmd)
2365         { /* Begin switch cmd */
2366
2367                 case TCGETS:
2368                         if (copy_to_user(argp, tty->termios, sizeof(struct termios)))
2369                                 return -EFAULT;
2370                         return 0;
2371                 case TCGETA:
2372                         return get_termio(tty, argp);
2373                 case TCSBRK:    /* SVID version: non-zero arg --> no break */
2374                         retval = tty_check_change(tty);
2375                         if (retval)
2376                                 return retval;
2377                         /* Setup an event to indicate when the transmit buffer empties */
2378                         spin_lock_irqsave(&epca_lock, flags);
2379                         setup_empty_event(tty,ch);
2380                         spin_unlock_irqrestore(&epca_lock, flags);
2381                         tty_wait_until_sent(tty, 0);
2382                         if (!arg)
2383                                 digi_send_break(ch, HZ/4);    /* 1/4 second */
2384                         return 0;
2385                 case TCSBRKP:   /* support for POSIX tcsendbreak() */
2386                         retval = tty_check_change(tty);
2387                         if (retval)
2388                                 return retval;
2389
2390                         /* Setup an event to indicate when the transmit buffer empties */
2391                         spin_lock_irqsave(&epca_lock, flags);
2392                         setup_empty_event(tty,ch);
2393                         spin_unlock_irqrestore(&epca_lock, flags);
2394                         tty_wait_until_sent(tty, 0);
2395                         digi_send_break(ch, arg ? arg*(HZ/10) : HZ/4);
2396                         return 0;
2397                 case TIOCGSOFTCAR:
2398                         if (put_user(C_CLOCAL(tty)?1:0, (unsigned long __user *)arg))
2399                                 return -EFAULT;
2400                         return 0;
2401                 case TIOCSSOFTCAR:
2402                 {
2403                         unsigned int value;
2404
2405                         if (get_user(value, (unsigned __user *)argp))
2406                                 return -EFAULT;
2407                         tty->termios->c_cflag =
2408                                 ((tty->termios->c_cflag & ~CLOCAL) |
2409                                  (value ? CLOCAL : 0));
2410                         return 0;
2411                 }
2412                 case TIOCMODG:
2413                         mflag = pc_tiocmget(tty, file);
2414                         if (put_user(mflag, (unsigned long __user *)argp))
2415                                 return -EFAULT;
2416                         break;
2417                 case TIOCMODS:
2418                         if (get_user(mstat, (unsigned __user *)argp))
2419                                 return -EFAULT;
2420                         return pc_tiocmset(tty, file, mstat, ~mstat);
2421                 case TIOCSDTR:
2422                         spin_lock_irqsave(&epca_lock, flags);
2423                         ch->omodem |= ch->m_dtr;
2424                         globalwinon(ch);
2425                         fepcmd(ch, SETMODEM, ch->m_dtr, 0, 10, 1);
2426                         memoff(ch);
2427                         spin_unlock_irqrestore(&epca_lock, flags);
2428                         break;
2429
2430                 case TIOCCDTR:
2431                         spin_lock_irqsave(&epca_lock, flags);
2432                         ch->omodem &= ~ch->m_dtr;
2433                         globalwinon(ch);
2434                         fepcmd(ch, SETMODEM, 0, ch->m_dtr, 10, 1);
2435                         memoff(ch);
2436                         spin_unlock_irqrestore(&epca_lock, flags);
2437                         break;
2438                 case DIGI_GETA:
2439                         if (copy_to_user(argp, &ch->digiext, sizeof(digi_t)))
2440                                 return -EFAULT;
2441                         break;
2442                 case DIGI_SETAW:
2443                 case DIGI_SETAF:
2444                         if (cmd == DIGI_SETAW) {
2445                                 /* Setup an event to indicate when the transmit buffer empties */
2446                                 spin_lock_irqsave(&epca_lock, flags);
2447                                 setup_empty_event(tty,ch);
2448                                 spin_unlock_irqrestore(&epca_lock, flags);
2449                                 tty_wait_until_sent(tty, 0);
2450                         } else  {
2451                                 /* ldisc lock already held in ioctl */
2452                                 if (tty->ldisc.flush_buffer)
2453                                         tty->ldisc.flush_buffer(tty);
2454                         }
2455                         /* Fall Thru */
2456                 case DIGI_SETA:
2457                         if (copy_from_user(&ch->digiext, argp, sizeof(digi_t)))
2458                                 return -EFAULT;
2459
2460                         if (ch->digiext.digi_flags & DIGI_ALTPIN)  {
2461                                 ch->dcd = ch->m_dsr;
2462                                 ch->dsr = ch->m_dcd;
2463                         } else {
2464                                 ch->dcd = ch->m_dcd;
2465                                 ch->dsr = ch->m_dsr;
2466                         }
2467
2468                         spin_lock_irqsave(&epca_lock, flags);
2469                         globalwinon(ch);
2470
2471                         /* -----------------------------------------------------------------
2472                                 The below routine generally sets up parity, baud, flow control
2473                                 issues, etc.... It effect both control flags and input flags.
2474                         ------------------------------------------------------------------- */
2475
2476                         epcaparam(tty,ch);
2477                         memoff(ch);
2478                         spin_unlock_irqrestore(&epca_lock, flags);
2479                         break;
2480
2481                 case DIGI_GETFLOW:
2482                 case DIGI_GETAFLOW:
2483                         spin_lock_irqsave(&epca_lock, flags);
2484                         globalwinon(ch);
2485                         if (cmd == DIGI_GETFLOW) {
2486                                 dflow.startc = readb(&bc->startc);
2487                                 dflow.stopc = readb(&bc->stopc);
2488                         } else {
2489                                 dflow.startc = readb(&bc->startca);
2490                                 dflow.stopc = readb(&bc->stopca);
2491                         }
2492                         memoff(ch);
2493                         spin_unlock_irqrestore(&epca_lock, flags);
2494
2495                         if (copy_to_user(argp, &dflow, sizeof(dflow)))
2496                                 return -EFAULT;
2497                         break;
2498
2499                 case DIGI_SETAFLOW:
2500                 case DIGI_SETFLOW:
2501                         if (cmd == DIGI_SETFLOW) {
2502                                 startc = ch->startc;
2503                                 stopc = ch->stopc;
2504                         } else {
2505                                 startc = ch->startca;
2506                                 stopc = ch->stopca;
2507                         }
2508
2509                         if (copy_from_user(&dflow, argp, sizeof(dflow)))
2510                                 return -EFAULT;
2511
2512                         if (dflow.startc != startc || dflow.stopc != stopc) { /* Begin  if setflow toggled */
2513                                 spin_lock_irqsave(&epca_lock, flags);
2514                                 globalwinon(ch);
2515
2516                                 if (cmd == DIGI_SETFLOW) {
2517                                         ch->fepstartc = ch->startc = dflow.startc;
2518                                         ch->fepstopc = ch->stopc = dflow.stopc;
2519                                         fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
2520                                 } else {
2521                                         ch->fepstartca = ch->startca = dflow.startc;
2522                                         ch->fepstopca  = ch->stopca = dflow.stopc;
2523                                         fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
2524                                 }
2525
2526                                 if (ch->statusflags & TXSTOPPED)
2527                                         pc_start(tty);
2528
2529                                 memoff(ch);
2530                                 spin_unlock_irqrestore(&epca_lock, flags);
2531                         } /* End if setflow toggled */
2532                         break;
2533                 default:
2534                         return -ENOIOCTLCMD;
2535         } /* End switch cmd */
2536         return 0;
2537 } /* End pc_ioctl */
2538
2539 /* --------------------- Begin pc_set_termios  ----------------------- */
2540
2541 static void pc_set_termios(struct tty_struct *tty, struct termios *old_termios)
2542 { /* Begin pc_set_termios */
2543
2544         struct channel *ch;
2545         unsigned long flags;
2546         /* ---------------------------------------------------------
2547                 verifyChannel returns the channel from the tty struct
2548                 if it is valid.  This serves as a sanity check.
2549         ------------------------------------------------------------- */
2550         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if channel valid */
2551                 spin_lock_irqsave(&epca_lock, flags);
2552                 globalwinon(ch);
2553                 epcaparam(tty, ch);
2554                 memoff(ch);
2555                 spin_unlock_irqrestore(&epca_lock, flags);
2556
2557                 if ((old_termios->c_cflag & CRTSCTS) &&
2558                          ((tty->termios->c_cflag & CRTSCTS) == 0))
2559                         tty->hw_stopped = 0;
2560
2561                 if (!(old_termios->c_cflag & CLOCAL) &&
2562                          (tty->termios->c_cflag & CLOCAL))
2563                         wake_up_interruptible(&ch->open_wait);
2564
2565         } /* End if channel valid */
2566
2567 } /* End pc_set_termios */
2568
2569 /* --------------------- Begin do_softint  ----------------------- */
2570
2571 static void do_softint(void *private_)
2572 { /* Begin do_softint */
2573         struct channel *ch = (struct channel *) private_;
2574         /* Called in response to a modem change event */
2575         if (ch && ch->magic == EPCA_MAGIC)  { /* Begin EPCA_MAGIC */
2576                 struct tty_struct *tty = ch->tty;
2577
2578                 if (tty && tty->driver_data) {
2579                         if (test_and_clear_bit(EPCA_EVENT_HANGUP, &ch->event)) { /* Begin if clear_bit */
2580                                 tty_hangup(tty);        /* FIXME: module removal race here - AKPM */
2581                                 wake_up_interruptible(&ch->open_wait);
2582                                 ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE;
2583                         } /* End if clear_bit */
2584                 }
2585         } /* End EPCA_MAGIC */
2586 } /* End do_softint */
2587
2588 /* ------------------------------------------------------------
2589         pc_stop and pc_start provide software flow control to the
2590         routine and the pc_ioctl routine.
2591 ---------------------------------------------------------------- */
2592
2593 /* --------------------- Begin pc_stop  ----------------------- */
2594
2595 static void pc_stop(struct tty_struct *tty)
2596 { /* Begin pc_stop */
2597
2598         struct channel *ch;
2599         unsigned long flags;
2600         /* ---------------------------------------------------------
2601                 verifyChannel returns the channel from the tty struct
2602                 if it is valid.  This serves as a sanity check.
2603         ------------------------------------------------------------- */
2604         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if valid channel */
2605                 spin_lock_irqsave(&epca_lock, flags);
2606                 if ((ch->statusflags & TXSTOPPED) == 0)  { /* Begin if transmit stop requested */
2607                         globalwinon(ch);
2608                         /* STOP transmitting now !! */
2609                         fepcmd(ch, PAUSETX, 0, 0, 0, 0);
2610                         ch->statusflags |= TXSTOPPED;
2611                         memoff(ch);
2612                 } /* End if transmit stop requested */
2613                 spin_unlock_irqrestore(&epca_lock, flags);
2614         } /* End if valid channel */
2615 } /* End pc_stop */
2616
2617 /* --------------------- Begin pc_start  ----------------------- */
2618
2619 static void pc_start(struct tty_struct *tty)
2620 { /* Begin pc_start */
2621         struct channel *ch;
2622         /* ---------------------------------------------------------
2623                 verifyChannel returns the channel from the tty struct
2624                 if it is valid.  This serves as a sanity check.
2625         ------------------------------------------------------------- */
2626         if ((ch = verifyChannel(tty)) != NULL) { /* Begin if channel valid */
2627                 unsigned long flags;
2628                 spin_lock_irqsave(&epca_lock, flags);
2629                 /* Just in case output was resumed because of a change in Digi-flow */
2630                 if (ch->statusflags & TXSTOPPED)  { /* Begin transmit resume requested */
2631                         struct board_chan __iomem *bc;
2632                         globalwinon(ch);
2633                         bc = ch->brdchan;
2634                         if (ch->statusflags & LOWWAIT)
2635                                 writeb(1, &bc->ilow);
2636                         /* Okay, you can start transmitting again... */
2637                         fepcmd(ch, RESUMETX, 0, 0, 0, 0);
2638                         ch->statusflags &= ~TXSTOPPED;
2639                         memoff(ch);
2640                 } /* End transmit resume requested */
2641                 spin_unlock_irqrestore(&epca_lock, flags);
2642         } /* End if channel valid */
2643 } /* End pc_start */
2644
2645 /* ------------------------------------------------------------------
2646         The below routines pc_throttle and pc_unthrottle are used
2647         to slow (And resume) the receipt of data into the kernels
2648         receive buffers.  The exact occurrence of this depends on the
2649         size of the kernels receive buffer and what the 'watermarks'
2650         are set to for that buffer.  See the n_ttys.c file for more
2651         details.
2652 ______________________________________________________________________ */
2653 /* --------------------- Begin throttle  ----------------------- */
2654
2655 static void pc_throttle(struct tty_struct * tty)
2656 { /* Begin pc_throttle */
2657         struct channel *ch;
2658         unsigned long flags;
2659         /* ---------------------------------------------------------
2660                 verifyChannel returns the channel from the tty struct
2661                 if it is valid.  This serves as a sanity check.
2662         ------------------------------------------------------------- */
2663         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if channel valid */
2664                 spin_lock_irqsave(&epca_lock, flags);
2665                 if ((ch->statusflags & RXSTOPPED) == 0) {
2666                         globalwinon(ch);
2667                         fepcmd(ch, PAUSERX, 0, 0, 0, 0);
2668                         ch->statusflags |= RXSTOPPED;
2669                         memoff(ch);
2670                 }
2671                 spin_unlock_irqrestore(&epca_lock, flags);
2672         } /* End if channel valid */
2673 } /* End pc_throttle */
2674
2675 /* --------------------- Begin unthrottle  ----------------------- */
2676
2677 static void pc_unthrottle(struct tty_struct *tty)
2678 { /* Begin pc_unthrottle */
2679         struct channel *ch;
2680         unsigned long flags;
2681         /* ---------------------------------------------------------
2682                 verifyChannel returns the channel from the tty struct
2683                 if it is valid.  This serves as a sanity check.
2684         ------------------------------------------------------------- */
2685         if ((ch = verifyChannel(tty)) != NULL)  { /* Begin if channel valid */
2686                 /* Just in case output was resumed because of a change in Digi-flow */
2687                 spin_lock_irqsave(&epca_lock, flags);
2688                 if (ch->statusflags & RXSTOPPED) {
2689                         globalwinon(ch);
2690                         fepcmd(ch, RESUMERX, 0, 0, 0, 0);
2691                         ch->statusflags &= ~RXSTOPPED;
2692                         memoff(ch);
2693                 }
2694                 spin_unlock_irqrestore(&epca_lock, flags);
2695         } /* End if channel valid */
2696 } /* End pc_unthrottle */
2697
2698 /* --------------------- Begin digi_send_break  ----------------------- */
2699
2700 void digi_send_break(struct channel *ch, int msec)
2701 { /* Begin digi_send_break */
2702         unsigned long flags;
2703
2704         spin_lock_irqsave(&epca_lock, flags);
2705         globalwinon(ch);
2706         /* --------------------------------------------------------------------
2707            Maybe I should send an infinite break here, schedule() for
2708            msec amount of time, and then stop the break.  This way,
2709            the user can't screw up the FEP by causing digi_send_break()
2710            to be called (i.e. via an ioctl()) more than once in msec amount
2711            of time.  Try this for now...
2712         ------------------------------------------------------------------------ */
2713         fepcmd(ch, SENDBREAK, msec, 0, 10, 0);
2714         memoff(ch);
2715         spin_unlock_irqrestore(&epca_lock, flags);
2716 } /* End digi_send_break */
2717
2718 /* --------------------- Begin setup_empty_event  ----------------------- */
2719
2720 /* Caller MUST hold the lock */
2721
2722 static void setup_empty_event(struct tty_struct *tty, struct channel *ch)
2723 { /* Begin setup_empty_event */
2724
2725         struct board_chan __iomem *bc = ch->brdchan;
2726
2727         globalwinon(ch);
2728         ch->statusflags |= EMPTYWAIT;
2729         /* ------------------------------------------------------------------
2730                 When set the iempty flag request a event to be generated when the
2731                 transmit buffer is empty (If there is no BREAK in progress).
2732         --------------------------------------------------------------------- */
2733         writeb(1, &bc->iempty);
2734         memoff(ch);
2735 } /* End setup_empty_event */
2736
2737 /* --------------------- Begin get_termio ----------------------- */
2738
2739 static int get_termio(struct tty_struct * tty, struct termio __user * termio)
2740 { /* Begin get_termio */
2741         return kernel_termios_to_user_termio(termio, tty->termios);
2742 } /* End get_termio */
2743
2744 /* ---------------------- Begin epca_setup  -------------------------- */
2745 void epca_setup(char *str, int *ints)
2746 { /* Begin epca_setup */
2747         struct board_info board;
2748         int               index, loop, last;
2749         char              *temp, *t2;
2750         unsigned          len;
2751
2752         /* ----------------------------------------------------------------------
2753                 If this routine looks a little strange it is because it is only called
2754                 if a LILO append command is given to boot the kernel with parameters.
2755                 In this way, we can provide the user a method of changing his board
2756                 configuration without rebuilding the kernel.
2757         ----------------------------------------------------------------------- */
2758         if (!liloconfig)
2759                 liloconfig = 1;
2760
2761         memset(&board, 0, sizeof(board));
2762
2763         /* Assume the data is int first, later we can change it */
2764         /* I think that array position 0 of ints holds the number of args */
2765         for (last = 0, index = 1; index <= ints[0]; index++)
2766                 switch(index)
2767                 { /* Begin parse switch */
2768                         case 1:
2769                                 board.status = ints[index];
2770                                 /* ---------------------------------------------------------
2771                                         We check for 2 (As opposed to 1; because 2 is a flag
2772                                         instructing the driver to ignore epcaconfig.)  For this
2773                                         reason we check for 2.
2774                                 ------------------------------------------------------------ */
2775                                 if (board.status == 2) { /* Begin ignore epcaconfig as well as lilo cmd line */
2776                                         nbdevs = 0;
2777                                         num_cards = 0;
2778                                         return;
2779                                 } /* End ignore epcaconfig as well as lilo cmd line */
2780
2781                                 if (board.status > 2) {
2782                                         printk(KERN_ERR "epca_setup: Invalid board status 0x%x\n", board.status);
2783                                         invalid_lilo_config = 1;
2784                                         setup_error_code |= INVALID_BOARD_STATUS;
2785                                         return;
2786                                 }
2787                                 last = index;
2788                                 break;
2789                         case 2:
2790                                 board.type = ints[index];
2791                                 if (board.type >= PCIXEM)  {
2792                                         printk(KERN_ERR "epca_setup: Invalid board type 0x%x\n", board.type);
2793                                         invalid_lilo_config = 1;
2794                                         setup_error_code |= INVALID_BOARD_TYPE;
2795                                         return;
2796                                 }
2797                                 last = index;
2798                                 break;
2799                         case 3:
2800                                 board.altpin = ints[index];
2801                                 if (board.altpin > 1) {
2802                                         printk(KERN_ERR "epca_setup: Invalid board altpin 0x%x\n", board.altpin);
2803                                         invalid_lilo_config = 1;
2804                                         setup_error_code |= INVALID_ALTPIN;
2805                                         return;
2806                                 }
2807                                 last = index;
2808                                 break;
2809
2810                         case 4:
2811                                 board.numports = ints[index];
2812                                 if (board.numports < 2 || board.numports > 256) {
2813                                         printk(KERN_ERR "epca_setup: Invalid board numports 0x%x\n", board.numports);
2814                                         invalid_lilo_config = 1;
2815                                         setup_error_code |= INVALID_NUM_PORTS;
2816                                         return;
2817                                 }
2818                                 nbdevs += board.numports;
2819                                 last = index;
2820                                 break;
2821
2822                         case 5:
2823                                 board.port = ints[index];
2824                                 if (ints[index] <= 0) {
2825                                         printk(KERN_ERR "epca_setup: Invalid io port 0x%x\n", (unsigned int)board.port);
2826                                         invalid_lilo_config = 1;
2827                                         setup_error_code |= INVALID_PORT_BASE;
2828                                         return;
2829                                 }
2830                                 last = index;
2831                                 break;
2832
2833                         case 6:
2834                                 board.membase = ints[index];
2835                                 if (ints[index] <= 0) {
2836                                         printk(KERN_ERR "epca_setup: Invalid memory base 0x%x\n",(unsigned int)board.membase);
2837                                         invalid_lilo_config = 1;
2838                                         setup_error_code |= INVALID_MEM_BASE;
2839                                         return;
2840                                 }
2841                                 last = index;
2842                                 break;
2843
2844                         default:
2845                                 printk(KERN_ERR "<Error> - epca_setup: Too many integer parms\n");
2846                                 return;
2847
2848                 } /* End parse switch */
2849
2850         while (str && *str)  { /* Begin while there is a string arg */
2851                 /* find the next comma or terminator */
2852                 temp = str;
2853                 /* While string is not null, and a comma hasn't been found */
2854                 while (*temp && (*temp != ','))
2855                         temp++;
2856                 if (!*temp)
2857                         temp = NULL;
2858                 else
2859                         *temp++ = 0;
2860                 /* Set index to the number of args + 1 */
2861                 index = last + 1;
2862
2863                 switch(index)
2864                 {
2865                         case 1:
2866                                 len = strlen(str);
2867                                 if (strncmp("Disable", str, len) == 0)
2868                                         board.status = 0;
2869                                 else if (strncmp("Enable", str, len) == 0)
2870                                         board.status = 1;
2871                                 else {
2872                                         printk(KERN_ERR "epca_setup: Invalid status %s\n", str);
2873                                         invalid_lilo_config = 1;
2874                                         setup_error_code |= INVALID_BOARD_STATUS;
2875                                         return;
2876                                 }
2877                                 last = index;
2878                                 break;
2879
2880                         case 2:
2881                                 for(loop = 0; loop < EPCA_NUM_TYPES; loop++)
2882                                         if (strcmp(board_desc[loop], str) == 0)
2883                                                 break;
2884                                 /* ---------------------------------------------------------------
2885                                         If the index incremented above refers to a legitamate board
2886                                         type set it here.
2887                                 ------------------------------------------------------------------*/
2888                                 if (index < EPCA_NUM_TYPES)
2889                                         board.type = loop;
2890                                 else {
2891                                         printk(KERN_ERR "epca_setup: Invalid board type: %s\n", str);
2892                                         invalid_lilo_config = 1;
2893                                         setup_error_code |= INVALID_BOARD_TYPE;
2894                                         return;
2895                                 }
2896                                 last = index;
2897                                 break;
2898
2899                         case 3:
2900                                 len = strlen(str);
2901                                 if (strncmp("Disable", str, len) == 0)
2902                                         board.altpin = 0;
2903                                 else if (strncmp("Enable", str, len) == 0)
2904                                         board.altpin = 1;
2905                                 else {
2906                                         printk(KERN_ERR "epca_setup: Invalid altpin %s\n", str);
2907                                         invalid_lilo_config = 1;
2908                                         setup_error_code |= INVALID_ALTPIN;
2909                                         return;
2910                                 }
2911                                 last = index;
2912                                 break;
2913
2914                         case 4:
2915                                 t2 = str;
2916                                 while (isdigit(*t2))
2917                                         t2++;
2918
2919                                 if (*t2) {
2920                                         printk(KERN_ERR "epca_setup: Invalid port count %s\n", str);
2921                                         invalid_lilo_config = 1;
2922                                         setup_error_code |= INVALID_NUM_PORTS;
2923                                         return;
2924                                 }
2925
2926                                 /* ------------------------------------------------------------
2927                                         There is not a man page for simple_strtoul but the code can be
2928                                         found in vsprintf.c.  The first argument is the string to
2929                                         translate (To an unsigned long obviously),  the second argument
2930                                         can be the address of any character variable or a NULL.  If a
2931                                         variable is given, the end pointer of the string will be stored
2932                                         in that variable; if a NULL is given the end pointer will
2933                                         not be returned.  The last argument is the base to use.  If
2934                                         a 0 is indicated, the routine will attempt to determine the
2935                                         proper base by looking at the values prefix (A '0' for octal,
2936                                         a 'x' for hex, etc ...  If a value is given it will use that
2937                                         value as the base.
2938                                 ---------------------------------------------------------------- */
2939                                 board.numports = simple_strtoul(str, NULL, 0);
2940                                 nbdevs += board.numports;
2941                                 last = index;
2942                                 break;
2943
2944                         case 5:
2945                                 t2 = str;
2946                                 while (isxdigit(*t2))
2947                                         t2++;
2948
2949                                 if (*t2) {
2950                                         printk(KERN_ERR "epca_setup: Invalid i/o address %s\n", str);
2951                                         invalid_lilo_config = 1;
2952                                         setup_error_code |= INVALID_PORT_BASE;
2953                                         return;
2954                                 }
2955
2956                                 board.port = simple_strtoul(str, NULL, 16);
2957                                 last = index;
2958                                 break;
2959
2960                         case 6:
2961                                 t2 = str;
2962                                 while (isxdigit(*t2))
2963                                         t2++;
2964
2965                                 if (*t2) {
2966                                         printk(KERN_ERR "epca_setup: Invalid memory base %s\n",str);
2967                                         invalid_lilo_config = 1;
2968                                         setup_error_code |= INVALID_MEM_BASE;
2969                                         return;
2970                                 }
2971                                 board.membase = simple_strtoul(str, NULL, 16);
2972                                 last = index;
2973                                 break;
2974                         default:
2975                                 printk(KERN_ERR "epca: Too many string parms\n");
2976                                 return;
2977                 }
2978                 str = temp;
2979         } /* End while there is a string arg */
2980
2981         if (last < 6) {
2982                 printk(KERN_ERR "epca: Insufficient parms specified\n");
2983                 return;
2984         }
2985
2986         /* I should REALLY validate the stuff here */
2987         /* Copies our local copy of board into boards */
2988         memcpy((void *)&boards[num_cards],(void *)&board, sizeof(board));
2989         /* Does this get called once per lilo arg are what ? */
2990         printk(KERN_INFO "PC/Xx: Added board %i, %s %i ports at 0x%4.4X base 0x%6.6X\n",
2991                 num_cards, board_desc[board.type],
2992                 board.numports, (int)board.port, (unsigned int) board.membase);
2993         num_cards++;
2994 } /* End epca_setup */
2995
2996
2997 /* ------------------------ Begin init_PCI  --------------------------- */
2998
2999 enum epic_board_types {
3000         brd_xr = 0,
3001         brd_xem,
3002         brd_cx,
3003         brd_xrj,
3004 };
3005
3006
3007 /* indexed directly by epic_board_types enum */
3008 static struct {
3009         unsigned char board_type;
3010         unsigned bar_idx;               /* PCI base address region */
3011 } epca_info_tbl[] = {
3012         { PCIXR, 0, },
3013         { PCIXEM, 0, },
3014         { PCICX, 0, },
3015         { PCIXRJ, 2, },
3016 };
3017
3018 static int __devinit epca_init_one (struct pci_dev *pdev,
3019                                  const struct pci_device_id *ent)
3020 {
3021         static int board_num = -1;
3022         int board_idx, info_idx = ent->driver_data;
3023         unsigned long addr;
3024
3025         if (pci_enable_device(pdev))
3026                 return -EIO;
3027
3028         board_num++;
3029         board_idx = board_num + num_cards;
3030         if (board_idx >= MAXBOARDS)
3031                 goto err_out;
3032
3033         addr = pci_resource_start (pdev, epca_info_tbl[info_idx].bar_idx);
3034         if (!addr) {
3035                 printk (KERN_ERR PFX "PCI region #%d not available (size 0)\n",
3036                         epca_info_tbl[info_idx].bar_idx);
3037                 goto err_out;
3038         }
3039
3040         boards[board_idx].status = ENABLED;
3041         boards[board_idx].type = epca_info_tbl[info_idx].board_type;
3042         boards[board_idx].numports = 0x0;
3043         boards[board_idx].port = addr + PCI_IO_OFFSET;
3044         boards[board_idx].membase = addr;
3045
3046         if (!request_mem_region (addr + PCI_IO_OFFSET, 0x200000, "epca")) {
3047                 printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailable\n",
3048                         0x200000, addr + PCI_IO_OFFSET);
3049                 goto err_out;
3050         }
3051
3052         boards[board_idx].re_map_port = ioremap(addr + PCI_IO_OFFSET, 0x200000);
3053         if (!boards[board_idx].re_map_port) {
3054                 printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lx\n",
3055                         0x200000, addr + PCI_IO_OFFSET);
3056                 goto err_out_free_pciio;
3057         }
3058
3059         if (!request_mem_region (addr, 0x200000, "epca")) {
3060                 printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailable\n",
3061                         0x200000, addr);
3062                 goto err_out_free_iounmap;
3063         }
3064
3065         boards[board_idx].re_map_membase = ioremap(addr, 0x200000);
3066         if (!boards[board_idx].re_map_membase) {
3067                 printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lx\n",
3068                         0x200000, addr + PCI_IO_OFFSET);
3069                 goto err_out_free_memregion;
3070         }
3071
3072         /* --------------------------------------------------------------
3073                 I don't know what the below does, but the hardware guys say
3074                 its required on everything except PLX (In this case XRJ).
3075         ---------------------------------------------------------------- */
3076         if (info_idx != brd_xrj) {
3077                 pci_write_config_byte(pdev, 0x40, 0);
3078                 pci_write_config_byte(pdev, 0x46, 0);
3079         }
3080
3081         return 0;
3082
3083 err_out_free_memregion:
3084         release_mem_region (addr, 0x200000);
3085 err_out_free_iounmap:
3086         iounmap (boards[board_idx].re_map_port);
3087 err_out_free_pciio:
3088         release_mem_region (addr + PCI_IO_OFFSET, 0x200000);
3089 err_out:
3090         return -ENODEV;
3091 }
3092
3093
3094 static struct pci_device_id epca_pci_tbl[] = {
3095         { PCI_VENDOR_DIGI, PCI_DEVICE_XR, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xr },
3096         { PCI_VENDOR_DIGI, PCI_DEVICE_XEM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xem },
3097         { PCI_VENDOR_DIGI, PCI_DEVICE_CX, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_cx },
3098         { PCI_VENDOR_DIGI, PCI_DEVICE_XRJ, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xrj },
3099         { 0, }
3100 };
3101
3102 MODULE_DEVICE_TABLE(pci, epca_pci_tbl);
3103
3104 int __init init_PCI (void)
3105 {       /* Begin init_PCI */
3106         memset (&epca_driver, 0, sizeof (epca_driver));
3107         epca_driver.name = "epca";
3108         epca_driver.id_table = epca_pci_tbl;
3109         epca_driver.probe = epca_init_one;
3110
3111         return pci_register_driver(&epca_driver);
3112 }
3113
3114 MODULE_LICENSE("GPL");