git.oblomov.eu Git - linux-2.6/blob - arch/ia64/hp/sim/simserial.c

   1 /*
   2  * Simulated Serial Driver (fake serial)
   3  *
   4  * This driver is mostly used for bringup purposes and will go away.
   5  * It has a strong dependency on the system console. All outputs
   6  * are rerouted to the same facility as the one used by printk which, in our
   7  * case means sys_sim.c console (goes via the simulator). The code hereafter
   8  * is completely leveraged from the serial.c driver.
   9  *
  10  * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co
  11  *      Stephane Eranian <eranian@hpl.hp.com>
  12  *      David Mosberger-Tang <davidm@hpl.hp.com>
  13  *
  14  * 02/04/00 D. Mosberger        Merged in serial.c bug fixes in rs_close().
  15  * 02/25/00 D. Mosberger        Synced up with 2.3.99pre-5 version of serial.c.
  16  * 07/30/02 D. Mosberger        Replace sti()/cli() with explicit spinlocks & local irq masking
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/errno.h>
  21 #include <linux/sched.h>
  22 #include <linux/tty.h>
  23 #include <linux/tty_flip.h>
  24 #include <linux/major.h>
  25 #include <linux/fcntl.h>
  26 #include <linux/mm.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/slab.h>
  29 #include <linux/capability.h>
  30 #include <linux/console.h>
  31 #include <linux/module.h>
  32 #include <linux/serial.h>
  33 #include <linux/serialP.h>
  34 #include <linux/sysrq.h>
  35
  36 #include <asm/irq.h>
  37 #include <asm/hw_irq.h>
  38 #include <asm/uaccess.h>
  39
  40 #undef SIMSERIAL_DEBUG  /* define this to get some debug information */
  41
  42 #define KEYBOARD_INTR   3       /* must match with simulator! */
  43
  44 #define NR_PORTS        1       /* only one port for now */
  45
  46 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED)
  47
  48 #define SSC_GETCHAR     21
  49
  50 extern long ia64_ssc (long, long, long, long, int);
  51 extern void ia64_ssc_connect_irq (long intr, long irq);
  52
  53 static char *serial_name = "SimSerial driver";
  54 static char *serial_version = "0.6";
  55
  56 /*
  57  * This has been extracted from asm/serial.h. We need one eventually but
  58  * I don't know exactly what we're going to put in it so just fake one
  59  * for now.
  60  */
  61 #define BASE_BAUD ( 1843200 / 16 )
  62
  63 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
  64
  65 /*
  66  * Most of the values here are meaningless to this particular driver.
  67  * However some values must be preserved for the code (leveraged from serial.c
  68  * to work correctly).
  69  * port must not be 0
  70  * type must not be UNKNOWN
  71  * So I picked arbitrary (guess from where?) values instead
  72  */
  73 static struct serial_state rs_table[NR_PORTS]={
  74   /* UART CLK   PORT IRQ     FLAGS        */
  75   { 0, BASE_BAUD, 0x3F8, 0, STD_COM_FLAGS,0,PORT_16550 }  /* ttyS0 */
  76 };
  77
  78 /*
  79  * Just for the fun of it !
  80  */
  81 static struct serial_uart_config uart_config[] = {
  82         { "unknown", 1, 0 },
  83         { "8250", 1, 0 },
  84         { "16450", 1, 0 },
  85         { "16550", 1, 0 },
  86         { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
  87         { "cirrus", 1, 0 },
  88         { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
  89         { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
  90                   UART_STARTECH },
  91         { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
  92         { NULL, 0}
  93 };
  94
  95 struct tty_driver *hp_simserial_driver;
  96
  97 static struct async_struct *IRQ_ports[NR_IRQS];
  98
  99 static struct console *console;
 100
 101 static unsigned char *tmp_buf;
 102
 103 extern struct console *console_drivers; /* from kernel/printk.c */
 104
 105 /*
 106  * ------------------------------------------------------------
 107  * rs_stop() and rs_start()
 108  *
 109  * This routines are called before setting or resetting tty->stopped.
 110  * They enable or disable transmitter interrupts, as necessary.
 111  * ------------------------------------------------------------
 112  */
 113 static void rs_stop(struct tty_struct *tty)
 114 {
 115 #ifdef SIMSERIAL_DEBUG
 116         printk("rs_stop: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
 117                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
 118 #endif
 119
 120 }
 121
 122 static void rs_start(struct tty_struct *tty)
 123 {
 124 #ifdef SIMSERIAL_DEBUG
 125         printk("rs_start: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
 126                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
 127 #endif
 128 }
 129
 130 static  void receive_chars(struct tty_struct *tty)
 131 {
 132         unsigned char ch;
 133         static unsigned char seen_esc = 0;
 134
 135         while ( (ch = ia64_ssc(0, 0, 0, 0, SSC_GETCHAR)) ) {
 136                 if ( ch == 27 && seen_esc == 0 ) {
 137                         seen_esc = 1;
 138                         continue;
 139                 } else {
 140                         if ( seen_esc==1 && ch == 'O' ) {
 141                                 seen_esc = 2;
 142                                 continue;
 143                         } else if ( seen_esc == 2 ) {
 144                                 if ( ch == 'P' ) /* F1 */
 145                                         show_state();
 146 #ifdef CONFIG_MAGIC_SYSRQ
 147                                 if ( ch == 'S' ) { /* F4 */
 148                                         do
 149                                                 ch = ia64_ssc(0, 0, 0, 0,
 150                                                               SSC_GETCHAR);
 151                                         while (!ch);
 152                                         handle_sysrq(ch, NULL);
 153                                 }
 154 #endif
 155                                 seen_esc = 0;
 156                                 continue;
 157                         }
 158                 }
 159                 seen_esc = 0;
 160
 161                 if (tty_insert_flip_char(tty, ch, TTY_NORMAL) == 0)
 162                         break;
 163         }
 164         tty_flip_buffer_push(tty);
 165 }
 166
 167 /*
 168  * This is the serial driver's interrupt routine for a single port
 169  */
 170 static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
 171 {
 172         struct async_struct * info;
 173
 174         /*
 175          * I don't know exactly why they don't use the dev_id opaque data
 176          * pointer instead of this extra lookup table
 177          */
 178         info = IRQ_ports[irq];
 179         if (!info || !info->tty) {
 180                 printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info);
 181                 return IRQ_NONE;
 182         }
 183         /*
 184          * pretty simple in our case, because we only get interrupts
 185          * on inbound traffic
 186          */
 187         receive_chars(info->tty);
 188         return IRQ_HANDLED;
 189 }
 190
 191 /*
 192  * -------------------------------------------------------------------
 193  * Here ends the serial interrupt routines.
 194  * -------------------------------------------------------------------
 195  */
 196
 197 static void do_softint(struct work_struct *private_)
 198 {
 199         printk(KERN_ERR "simserial: do_softint called\n");
 200 }
 201
 202 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 203 {
 204         struct async_struct *info = (struct async_struct *)tty->driver_data;
 205         unsigned long flags;
 206
 207         if (!tty || !info->xmit.buf)
 208                 return 0;
 209
 210         local_irq_save(flags);
 211         if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) {
 212                 local_irq_restore(flags);
 213                 return 0;
 214         }
 215         info->xmit.buf[info->xmit.head] = ch;
 216         info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
 217         local_irq_restore(flags);
 218         return 1;
 219 }
 220
 221 static void transmit_chars(struct async_struct *info, int *intr_done)
 222 {
 223         int count;
 224         unsigned long flags;
 225
 226
 227         local_irq_save(flags);
 228
 229         if (info->x_char) {
 230                 char c = info->x_char;
 231
 232                 console->write(console, &c, 1);
 233
 234                 info->state->icount.tx++;
 235                 info->x_char = 0;
 236
 237                 goto out;
 238         }
 239
 240         if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) {
 241 #ifdef SIMSERIAL_DEBUG
 242                 printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
 243                        info->xmit.head, info->xmit.tail, info->tty->stopped);
 244 #endif
 245                 goto out;
 246         }
 247         /*
 248          * We removed the loop and try to do it in to chunks. We need
 249          * 2 operations maximum because it's a ring buffer.
 250          *
 251          * First from current to tail if possible.
 252          * Then from the beginning of the buffer until necessary
 253          */
 254
 255         count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE),
 256                     SERIAL_XMIT_SIZE - info->xmit.tail);
 257         console->write(console, info->xmit.buf+info->xmit.tail, count);
 258
 259         info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1);
 260
 261         /*
 262          * We have more at the beginning of the buffer
 263          */
 264         count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 265         if (count) {
 266                 console->write(console, info->xmit.buf, count);
 267                 info->xmit.tail += count;
 268         }
 269 out:
 270         local_irq_restore(flags);
 271 }
 272
 273 static void rs_flush_chars(struct tty_struct *tty)
 274 {
 275         struct async_struct *info = (struct async_struct *)tty->driver_data;
 276
 277         if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped ||
 278             !info->xmit.buf)
 279                 return;
 280
 281         transmit_chars(info, NULL);
 282 }
 283
 284
 285 static int rs_write(struct tty_struct * tty,
 286                     const unsigned char *buf, int count)
 287 {
 288         int     c, ret = 0;
 289         struct async_struct *info = (struct async_struct *)tty->driver_data;
 290         unsigned long flags;
 291
 292         if (!tty || !info->xmit.buf || !tmp_buf) return 0;
 293
 294         local_irq_save(flags);
 295         while (1) {
 296                 c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 297                 if (count < c)
 298                         c = count;
 299                 if (c <= 0) {
 300                         break;
 301                 }
 302                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 303                 info->xmit.head = ((info->xmit.head + c) &
 304                                    (SERIAL_XMIT_SIZE-1));
 305                 buf += c;
 306                 count -= c;
 307                 ret += c;
 308         }
 309         local_irq_restore(flags);
 310         /*
 311          * Hey, we transmit directly from here in our case
 312          */
 313         if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE)
 314             && !tty->stopped && !tty->hw_stopped) {
 315                 transmit_chars(info, NULL);
 316         }
 317         return ret;
 318 }
 319
 320 static int rs_write_room(struct tty_struct *tty)
 321 {
 322         struct async_struct *info = (struct async_struct *)tty->driver_data;
 323
 324         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 325 }
 326
 327 static int rs_chars_in_buffer(struct tty_struct *tty)
 328 {
 329         struct async_struct *info = (struct async_struct *)tty->driver_data;
 330
 331         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 332 }
 333
 334 static void rs_flush_buffer(struct tty_struct *tty)
 335 {
 336         struct async_struct *info = (struct async_struct *)tty->driver_data;
 337         unsigned long flags;
 338
 339         local_irq_save(flags);
 340         info->xmit.head = info->xmit.tail = 0;
 341         local_irq_restore(flags);
 342
 343         tty_wakeup(tty);
 344 }
 345
 346 /*
 347  * This function is used to send a high-priority XON/XOFF character to
 348  * the device
 349  */
 350 static void rs_send_xchar(struct tty_struct *tty, char ch)
 351 {
 352         struct async_struct *info = (struct async_struct *)tty->driver_data;
 353
 354         info->x_char = ch;
 355         if (ch) {
 356                 /*
 357                  * I guess we could call console->write() directly but
 358                  * let's do that for now.
 359                  */
 360                 transmit_chars(info, NULL);
 361         }
 362 }
 363
 364 /*
 365  * ------------------------------------------------------------
 366  * rs_throttle()
 367  *
 368  * This routine is called by the upper-layer tty layer to signal that
 369  * incoming characters should be throttled.
 370  * ------------------------------------------------------------
 371  */
 372 static void rs_throttle(struct tty_struct * tty)
 373 {
 374         if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty));
 375
 376         printk(KERN_INFO "simrs_throttle called\n");
 377 }
 378
 379 static void rs_unthrottle(struct tty_struct * tty)
 380 {
 381         struct async_struct *info = (struct async_struct *)tty->driver_data;
 382
 383         if (I_IXOFF(tty)) {
 384                 if (info->x_char)
 385                         info->x_char = 0;
 386                 else
 387                         rs_send_xchar(tty, START_CHAR(tty));
 388         }
 389         printk(KERN_INFO "simrs_unthrottle called\n");
 390 }
 391
 392
 393 static int rs_ioctl(struct tty_struct *tty, struct file * file,
 394                     unsigned int cmd, unsigned long arg)
 395 {
 396         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 397             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
 398             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
 399                 if (tty->flags & (1 << TTY_IO_ERROR))
 400                     return -EIO;
 401         }
 402
 403         switch (cmd) {
 404                 case TIOCGSERIAL:
 405                         printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n");
 406                         return 0;
 407                 case TIOCSSERIAL:
 408                         printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n");
 409                         return 0;
 410                 case TIOCSERCONFIG:
 411                         printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n");
 412                         return -EINVAL;
 413
 414                 case TIOCSERGETLSR: /* Get line status register */
 415                         printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n");
 416                         return  -EINVAL;
 417
 418                 case TIOCSERGSTRUCT:
 419                         printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n");
 420 #if 0
 421                         if (copy_to_user((struct async_struct *) arg,
 422                                          info, sizeof(struct async_struct)))
 423                                 return -EFAULT;
 424 #endif
 425                         return 0;
 426
 427                 /*
 428                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
 429                  * - mask passed in arg for lines of interest
 430                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
 431                  * Caller should use TIOCGICOUNT to see which one it was
 432                  */
 433                 case TIOCMIWAIT:
 434                         printk(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\n");
 435                         return 0;
 436                 /*
 437                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
 438                  * Return: write counters to the user passed counter struct
 439                  * NB: both 1->0 and 0->1 transitions are counted except for
 440                  *     RI where only 0->1 is counted.
 441                  */
 442                 case TIOCGICOUNT:
 443                         printk(KERN_INFO "rs_ioctl: TIOCGICOUNT called\n");
 444                         return 0;
 445
 446                 case TIOCSERGWILD:
 447                 case TIOCSERSWILD:
 448                         /* "setserial -W" is called in Debian boot */
 449                         printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n");
 450                         return 0;
 451
 452                 default:
 453                         return -ENOIOCTLCMD;
 454                 }
 455         return 0;
 456 }
 457
 458 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 459
 460 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 461 {
 462         /* Handle turning off CRTSCTS */
 463         if ((old_termios->c_cflag & CRTSCTS) &&
 464             !(tty->termios->c_cflag & CRTSCTS)) {
 465                 tty->hw_stopped = 0;
 466                 rs_start(tty);
 467         }
 468 }
 469 /*
 470  * This routine will shutdown a serial port; interrupts are disabled, and
 471  * DTR is dropped if the hangup on close termio flag is on.
 472  */
 473 static void shutdown(struct async_struct * info)
 474 {
 475         unsigned long   flags;
 476         struct serial_state *state;
 477         int             retval;
 478
 479         if (!(info->flags & ASYNC_INITIALIZED)) return;
 480
 481         state = info->state;
 482
 483 #ifdef SIMSERIAL_DEBUG
 484         printk("Shutting down serial port %d (irq %d)....", info->line,
 485                state->irq);
 486 #endif
 487
 488         local_irq_save(flags);
 489         {
 490                 /*
 491                  * First unlink the serial port from the IRQ chain...
 492                  */
 493                 if (info->next_port)
 494                         info->next_port->prev_port = info->prev_port;
 495                 if (info->prev_port)
 496                         info->prev_port->next_port = info->next_port;
 497                 else
 498                         IRQ_ports[state->irq] = info->next_port;
 499
 500                 /*
 501                  * Free the IRQ, if necessary
 502                  */
 503                 if (state->irq && (!IRQ_ports[state->irq] ||
 504                                    !IRQ_ports[state->irq]->next_port)) {
 505                         if (IRQ_ports[state->irq]) {
 506                                 free_irq(state->irq, NULL);
 507                                 retval = request_irq(state->irq, rs_interrupt_single,
 508                                                      IRQ_T(info), "serial", NULL);
 509
 510                                 if (retval)
 511                                         printk(KERN_ERR "serial shutdown: request_irq: error %d"
 512                                                "  Couldn't reacquire IRQ.\n", retval);
 513                         } else
 514                                 free_irq(state->irq, NULL);
 515                 }
 516
 517                 if (info->xmit.buf) {
 518                         free_page((unsigned long) info->xmit.buf);
 519                         info->xmit.buf = NULL;
 520                 }
 521
 522                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
 523
 524                 info->flags &= ~ASYNC_INITIALIZED;
 525         }
 526         local_irq_restore(flags);
 527 }
 528
 529 /*
 530  * ------------------------------------------------------------
 531  * rs_close()
 532  *
 533  * This routine is called when the serial port gets closed.  First, we
 534  * wait for the last remaining data to be sent.  Then, we unlink its
 535  * async structure from the interrupt chain if necessary, and we free
 536  * that IRQ if nothing is left in the chain.
 537  * ------------------------------------------------------------
 538  */
 539 static void rs_close(struct tty_struct *tty, struct file * filp)
 540 {
 541         struct async_struct * info = (struct async_struct *)tty->driver_data;
 542         struct serial_state *state;
 543         unsigned long flags;
 544
 545         if (!info ) return;
 546
 547         state = info->state;
 548
 549         local_irq_save(flags);
 550         if (tty_hung_up_p(filp)) {
 551 #ifdef SIMSERIAL_DEBUG
 552                 printk("rs_close: hung_up\n");
 553 #endif
 554                 local_irq_restore(flags);
 555                 return;
 556         }
 557 #ifdef SIMSERIAL_DEBUG
 558         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
 559 #endif
 560         if ((tty->count == 1) && (state->count != 1)) {
 561                 /*
 562                  * Uh, oh.  tty->count is 1, which means that the tty
 563                  * structure will be freed.  state->count should always
 564                  * be one in these conditions.  If it's greater than
 565                  * one, we've got real problems, since it means the
 566                  * serial port won't be shutdown.
 567                  */
 568                 printk(KERN_ERR "rs_close: bad serial port count; tty->count is 1, "
 569                        "state->count is %d\n", state->count);
 570                 state->count = 1;
 571         }
 572         if (--state->count < 0) {
 573                 printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
 574                        info->line, state->count);
 575                 state->count = 0;
 576         }
 577         if (state->count) {
 578                 local_irq_restore(flags);
 579                 return;
 580         }
 581         info->flags |= ASYNC_CLOSING;
 582         local_irq_restore(flags);
 583
 584         /*
 585          * Now we wait for the transmit buffer to clear; and we notify
 586          * the line discipline to only process XON/XOFF characters.
 587          */
 588         shutdown(info);
 589         rs_flush_buffer(tty);
 590         tty_ldisc_flush(tty);
 591         info->event = 0;
 592         info->tty = NULL;
 593         if (info->blocked_open) {
 594                 if (info->close_delay)
 595                         schedule_timeout_interruptible(info->close_delay);
 596                 wake_up_interruptible(&info->open_wait);
 597         }
 598         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 599         wake_up_interruptible(&info->close_wait);
 600 }
 601
 602 /*
 603  * rs_wait_until_sent() --- wait until the transmitter is empty
 604  */
 605 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
 606 {
 607 }
 608
 609
 610 /*
 611  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
 612  */
 613 static void rs_hangup(struct tty_struct *tty)
 614 {
 615         struct async_struct * info = (struct async_struct *)tty->driver_data;
 616         struct serial_state *state = info->state;
 617
 618 #ifdef SIMSERIAL_DEBUG
 619         printk("rs_hangup: called\n");
 620 #endif
 621
 622         state = info->state;
 623
 624         rs_flush_buffer(tty);
 625         if (info->flags & ASYNC_CLOSING)
 626                 return;
 627         shutdown(info);
 628
 629         info->event = 0;
 630         state->count = 0;
 631         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 632         info->tty = NULL;
 633         wake_up_interruptible(&info->open_wait);
 634 }
 635
 636
 637 static int get_async_struct(int line, struct async_struct **ret_info)
 638 {
 639         struct async_struct *info;
 640         struct serial_state *sstate;
 641
 642         sstate = rs_table + line;
 643         sstate->count++;
 644         if (sstate->info) {
 645                 *ret_info = sstate->info;
 646                 return 0;
 647         }
 648         info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
 649         if (!info) {
 650                 sstate->count--;
 651                 return -ENOMEM;
 652         }
 653         init_waitqueue_head(&info->open_wait);
 654         init_waitqueue_head(&info->close_wait);
 655         init_waitqueue_head(&info->delta_msr_wait);
 656         info->magic = SERIAL_MAGIC;
 657         info->port = sstate->port;
 658         info->flags = sstate->flags;
 659         info->xmit_fifo_size = sstate->xmit_fifo_size;
 660         info->line = line;
 661         INIT_WORK(&info->work, do_softint);
 662         info->state = sstate;
 663         if (sstate->info) {
 664                 kfree(info);
 665                 *ret_info = sstate->info;
 666                 return 0;
 667         }
 668         *ret_info = sstate->info = info;
 669         return 0;
 670 }
 671
 672 static int
 673 startup(struct async_struct *info)
 674 {
 675         unsigned long flags;
 676         int     retval=0;
 677         irq_handler_t handler;
 678         struct serial_state *state= info->state;
 679         unsigned long page;
 680
 681         page = get_zeroed_page(GFP_KERNEL);
 682         if (!page)
 683                 return -ENOMEM;
 684
 685         local_irq_save(flags);
 686
 687         if (info->flags & ASYNC_INITIALIZED) {
 688                 free_page(page);
 689                 goto errout;
 690         }
 691
 692         if (!state->port || !state->type) {
 693                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
 694                 free_page(page);
 695                 goto errout;
 696         }
 697         if (info->xmit.buf)
 698                 free_page(page);
 699         else
 700                 info->xmit.buf = (unsigned char *) page;
 701
 702 #ifdef SIMSERIAL_DEBUG
 703         printk("startup: ttys%d (irq %d)...", info->line, state->irq);
 704 #endif
 705
 706         /*
 707          * Allocate the IRQ if necessary
 708          */
 709         if (state->irq && (!IRQ_ports[state->irq] ||
 710                           !IRQ_ports[state->irq]->next_port)) {
 711                 if (IRQ_ports[state->irq]) {
 712                         retval = -EBUSY;
 713                         goto errout;
 714                 } else
 715                         handler = rs_interrupt_single;
 716
 717                 retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", NULL);
 718                 if (retval) {
 719                         if (capable(CAP_SYS_ADMIN)) {
 720                                 if (info->tty)
 721                                         set_bit(TTY_IO_ERROR,
 722                                                 &info->tty->flags);
 723                                 retval = 0;
 724                         }
 725                         goto errout;
 726                 }
 727         }
 728
 729         /*
 730          * Insert serial port into IRQ chain.
 731          */
 732         info->prev_port = NULL;
 733         info->next_port = IRQ_ports[state->irq];
 734         if (info->next_port)
 735                 info->next_port->prev_port = info;
 736         IRQ_ports[state->irq] = info;
 737
 738         if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags);
 739
 740         info->xmit.head = info->xmit.tail = 0;
 741
 742 #if 0
 743         /*
 744          * Set up serial timers...
 745          */
 746         timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
 747         timer_active |= 1 << RS_TIMER;
 748 #endif
 749
 750         /*
 751          * Set up the tty->alt_speed kludge
 752          */
 753         if (info->tty) {
 754                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 755                         info->tty->alt_speed = 57600;
 756                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 757                         info->tty->alt_speed = 115200;
 758                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 759                         info->tty->alt_speed = 230400;
 760                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 761                         info->tty->alt_speed = 460800;
 762         }
 763
 764         info->flags |= ASYNC_INITIALIZED;
 765         local_irq_restore(flags);
 766         return 0;
 767
 768 errout:
 769         local_irq_restore(flags);
 770         return retval;
 771 }
 772
 773
 774 /*
 775  * This routine is called whenever a serial port is opened.  It
 776  * enables interrupts for a serial port, linking in its async structure into
 777  * the IRQ chain.   It also performs the serial-specific
 778  * initialization for the tty structure.
 779  */
 780 static int rs_open(struct tty_struct *tty, struct file * filp)
 781 {
 782         struct async_struct     *info;
 783         int                     retval, line;
 784         unsigned long           page;
 785
 786         line = tty->index;
 787         if ((line < 0) || (line >= NR_PORTS))
 788                 return -ENODEV;
 789         retval = get_async_struct(line, &info);
 790         if (retval)
 791                 return retval;
 792         tty->driver_data = info;
 793         info->tty = tty;
 794
 795 #ifdef SIMSERIAL_DEBUG
 796         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
 797 #endif
 798         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 799
 800         if (!tmp_buf) {
 801                 page = get_zeroed_page(GFP_KERNEL);
 802                 if (!page)
 803                         return -ENOMEM;
 804                 if (tmp_buf)
 805                         free_page(page);
 806                 else
 807                         tmp_buf = (unsigned char *) page;
 808         }
 809
 810         /*
 811          * If the port is the middle of closing, bail out now
 812          */
 813         if (tty_hung_up_p(filp) ||
 814             (info->flags & ASYNC_CLOSING)) {
 815                 if (info->flags & ASYNC_CLOSING)
 816                         interruptible_sleep_on(&info->close_wait);
 817 #ifdef SERIAL_DO_RESTART
 818                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
 819                         -EAGAIN : -ERESTARTSYS);
 820 #else
 821                 return -EAGAIN;
 822 #endif
 823         }
 824
 825         /*
 826          * Start up serial port
 827          */
 828         retval = startup(info);
 829         if (retval) {
 830                 return retval;
 831         }
 832
 833         /*
 834          * figure out which console to use (should be one already)
 835          */
 836         console = console_drivers;
 837         while (console) {
 838                 if ((console->flags & CON_ENABLED) && console->write) break;
 839                 console = console->next;
 840         }
 841
 842 #ifdef SIMSERIAL_DEBUG
 843         printk("rs_open ttys%d successful\n", info->line);
 844 #endif
 845         return 0;
 846 }
 847
 848 /*
 849  * /proc fs routines....
 850  */
 851
 852 static inline void line_info(struct seq_file *m, struct serial_state *state)
 853 {
 854         seq_printf(m, "%d: uart:%s port:%lX irq:%d\n",
 855                        state->line, uart_config[state->type].name,
 856                        state->port, state->irq);
 857 }
 858
 859 static int rs_proc_show(struct seq_file *m, void *v)
 860 {
 861         int i;
 862
 863         seq_printf(m, "simserinfo:1.0 driver:%s\n", serial_version);
 864         for (i = 0; i < NR_PORTS; i++)
 865                 line_info(m, &rs_table[i]);
 866         return 0;
 867 }
 868
 869 static int rs_proc_open(struct inode *inode, struct file *file)
 870 {
 871         return single_open(file, rs_proc_show, NULL);
 872 }
 873
 874 static const struct file_operations rs_proc_fops = {
 875         .owner          = THIS_MODULE,
 876         .open           = rs_proc_open,
 877         .read           = seq_read,
 878         .llseek         = seq_lseek,
 879         .release        = single_release,
 880 };
 881
 882 /*
 883  * ---------------------------------------------------------------------
 884  * rs_init() and friends
 885  *
 886  * rs_init() is called at boot-time to initialize the serial driver.
 887  * ---------------------------------------------------------------------
 888  */
 889
 890 /*
 891  * This routine prints out the appropriate serial driver version
 892  * number, and identifies which options were configured into this
 893  * driver.
 894  */
 895 static inline void show_serial_version(void)
 896 {
 897         printk(KERN_INFO "%s version %s with", serial_name, serial_version);
 898         printk(KERN_INFO " no serial options enabled\n");
 899 }
 900
 901 static const struct tty_operations hp_ops = {
 902         .open = rs_open,
 903         .close = rs_close,
 904         .write = rs_write,
 905         .put_char = rs_put_char,
 906         .flush_chars = rs_flush_chars,
 907         .write_room = rs_write_room,
 908         .chars_in_buffer = rs_chars_in_buffer,
 909         .flush_buffer = rs_flush_buffer,
 910         .ioctl = rs_ioctl,
 911         .throttle = rs_throttle,
 912         .unthrottle = rs_unthrottle,
 913         .send_xchar = rs_send_xchar,
 914         .set_termios = rs_set_termios,
 915         .stop = rs_stop,
 916         .start = rs_start,
 917         .hangup = rs_hangup,
 918         .wait_until_sent = rs_wait_until_sent,
 919         .proc_fops = &rs_proc_fops,
 920 };
 921
 922 /*
 923  * The serial driver boot-time initialization code!
 924  */
 925 static int __init
 926 simrs_init (void)
 927 {
 928         int                     i, rc;
 929         struct serial_state     *state;
 930
 931         if (!ia64_platform_is("hpsim"))
 932                 return -ENODEV;
 933
 934         hp_simserial_driver = alloc_tty_driver(1);
 935         if (!hp_simserial_driver)
 936                 return -ENOMEM;
 937
 938         show_serial_version();
 939
 940         /* Initialize the tty_driver structure */
 941
 942         hp_simserial_driver->owner = THIS_MODULE;
 943         hp_simserial_driver->driver_name = "simserial";
 944         hp_simserial_driver->name = "ttyS";
 945         hp_simserial_driver->major = TTY_MAJOR;
 946         hp_simserial_driver->minor_start = 64;
 947         hp_simserial_driver->type = TTY_DRIVER_TYPE_SERIAL;
 948         hp_simserial_driver->subtype = SERIAL_TYPE_NORMAL;
 949         hp_simserial_driver->init_termios = tty_std_termios;
 950         hp_simserial_driver->init_termios.c_cflag =
 951                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 952         hp_simserial_driver->flags = TTY_DRIVER_REAL_RAW;
 953         tty_set_operations(hp_simserial_driver, &hp_ops);
 954
 955         /*
 956          * Let's have a little bit of fun !
 957          */
 958         for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
 959
 960                 if (state->type == PORT_UNKNOWN) continue;
 961
 962                 if (!state->irq) {
 963                         if ((rc = assign_irq_vector(AUTO_ASSIGN)) < 0)
 964                                 panic("%s: out of interrupt vectors!\n",
 965                                       __func__);
 966                         state->irq = rc;
 967                         ia64_ssc_connect_irq(KEYBOARD_INTR, state->irq);
 968                 }
 969
 970                 printk(KERN_INFO "ttyS%d at 0x%04lx (irq = %d) is a %s\n",
 971                        state->line,
 972                        state->port, state->irq,
 973                        uart_config[state->type].name);
 974         }
 975
 976         if (tty_register_driver(hp_simserial_driver))
 977                 panic("Couldn't register simserial driver\n");
 978
 979         return 0;
 980 }
 981
 982 #ifndef MODULE
 983 __initcall(simrs_init);
 984 #endif