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/slab.h>
  28 #include <linux/capability.h>
  29 #include <linux/console.h>
  30 #include <linux/module.h>
  31 #include <linux/serial.h>
  32 #include <linux/serialP.h>
  33 #include <linux/sysrq.h>
  34
  35 #include <asm/irq.h>
  36 #include <asm/hw_irq.h>
  37 #include <asm/uaccess.h>
  38
  39 #undef SIMSERIAL_DEBUG  /* define this to get some debug information */
  40
  41 #define KEYBOARD_INTR   3       /* must match with simulator! */
  42
  43 #define NR_PORTS        1       /* only one port for now */
  44
  45 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED)
  46
  47 #define SSC_GETCHAR     21
  48
  49 extern long ia64_ssc (long, long, long, long, int);
  50 extern void ia64_ssc_connect_irq (long intr, long irq);
  51
  52 static char *serial_name = "SimSerial driver";
  53 static char *serial_version = "0.6";
  54
  55 /*
  56  * This has been extracted from asm/serial.h. We need one eventually but
  57  * I don't know exactly what we're going to put in it so just fake one
  58  * for now.
  59  */
  60 #define BASE_BAUD ( 1843200 / 16 )
  61
  62 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
  63
  64 /*
  65  * Most of the values here are meaningless to this particular driver.
  66  * However some values must be preserved for the code (leveraged from serial.c
  67  * to work correctly).
  68  * port must not be 0
  69  * type must not be UNKNOWN
  70  * So I picked arbitrary (guess from where?) values instead
  71  */
  72 static struct serial_state rs_table[NR_PORTS]={
  73   /* UART CLK   PORT IRQ     FLAGS        */
  74   { 0, BASE_BAUD, 0x3F8, 0, STD_COM_FLAGS,0,PORT_16550 }  /* ttyS0 */
  75 };
  76
  77 /*
  78  * Just for the fun of it !
  79  */
  80 static struct serial_uart_config uart_config[] = {
  81         { "unknown", 1, 0 },
  82         { "8250", 1, 0 },
  83         { "16450", 1, 0 },
  84         { "16550", 1, 0 },
  85         { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
  86         { "cirrus", 1, 0 },
  87         { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
  88         { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
  89                   UART_STARTECH },
  90         { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
  91         { NULL, 0}
  92 };
  93
  94 struct tty_driver *hp_simserial_driver;
  95
  96 static struct async_struct *IRQ_ports[NR_IRQS];
  97
  98 static struct console *console;
  99
 100 static unsigned char *tmp_buf;
 101
 102 extern struct console *console_drivers; /* from kernel/printk.c */
 103
 104 /*
 105  * ------------------------------------------------------------
 106  * rs_stop() and rs_start()
 107  *
 108  * This routines are called before setting or resetting tty->stopped.
 109  * They enable or disable transmitter interrupts, as necessary.
 110  * ------------------------------------------------------------
 111  */
 112 static void rs_stop(struct tty_struct *tty)
 113 {
 114 #ifdef SIMSERIAL_DEBUG
 115         printk("rs_stop: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
 116                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
 117 #endif
 118
 119 }
 120
 121 static void rs_start(struct tty_struct *tty)
 122 {
 123 #ifdef SIMSERIAL_DEBUG
 124         printk("rs_start: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
 125                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
 126 #endif
 127 }
 128
 129 static  void receive_chars(struct tty_struct *tty)
 130 {
 131         unsigned char ch;
 132         static unsigned char seen_esc = 0;
 133
 134         while ( (ch = ia64_ssc(0, 0, 0, 0, SSC_GETCHAR)) ) {
 135                 if ( ch == 27 && seen_esc == 0 ) {
 136                         seen_esc = 1;
 137                         continue;
 138                 } else {
 139                         if ( seen_esc==1 && ch == 'O' ) {
 140                                 seen_esc = 2;
 141                                 continue;
 142                         } else if ( seen_esc == 2 ) {
 143                                 if ( ch == 'P' ) /* F1 */
 144                                         show_state();
 145 #ifdef CONFIG_MAGIC_SYSRQ
 146                                 if ( ch == 'S' ) { /* F4 */
 147                                         do
 148                                                 ch = ia64_ssc(0, 0, 0, 0,
 149                                                               SSC_GETCHAR);
 150                                         while (!ch);
 151                                         handle_sysrq(ch, NULL);
 152                                 }
 153 #endif
 154                                 seen_esc = 0;
 155                                 continue;
 156                         }
 157                 }
 158                 seen_esc = 0;
 159
 160                 if (tty_insert_flip_char(tty, ch, TTY_NORMAL) == 0)
 161                         break;
 162         }
 163         tty_flip_buffer_push(tty);
 164 }
 165
 166 /*
 167  * This is the serial driver's interrupt routine for a single port
 168  */
 169 static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
 170 {
 171         struct async_struct * info;
 172
 173         /*
 174          * I don't know exactly why they don't use the dev_id opaque data
 175          * pointer instead of this extra lookup table
 176          */
 177         info = IRQ_ports[irq];
 178         if (!info || !info->tty) {
 179                 printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info);
 180                 return IRQ_NONE;
 181         }
 182         /*
 183          * pretty simple in our case, because we only get interrupts
 184          * on inbound traffic
 185          */
 186         receive_chars(info->tty);
 187         return IRQ_HANDLED;
 188 }
 189
 190 /*
 191  * -------------------------------------------------------------------
 192  * Here ends the serial interrupt routines.
 193  * -------------------------------------------------------------------
 194  */
 195
 196 #if 0
 197 /*
 198  * not really used in our situation so keep them commented out for now
 199  */
 200 static DECLARE_TASK_QUEUE(tq_serial); /* used to be at the top of the file */
 201 static void do_serial_bh(void)
 202 {
 203         run_task_queue(&tq_serial);
 204         printk(KERN_ERR "do_serial_bh: called\n");
 205 }
 206 #endif
 207
 208 static void do_softint(struct work_struct *private_)
 209 {
 210         printk(KERN_ERR "simserial: do_softint called\n");
 211 }
 212
 213 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 214 {
 215         struct async_struct *info = (struct async_struct *)tty->driver_data;
 216         unsigned long flags;
 217
 218         if (!tty || !info->xmit.buf)
 219                 return 0;
 220
 221         local_irq_save(flags);
 222         if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) {
 223                 local_irq_restore(flags);
 224                 return 0;
 225         }
 226         info->xmit.buf[info->xmit.head] = ch;
 227         info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
 228         local_irq_restore(flags);
 229         return 1;
 230 }
 231
 232 static void transmit_chars(struct async_struct *info, int *intr_done)
 233 {
 234         int count;
 235         unsigned long flags;
 236
 237
 238         local_irq_save(flags);
 239
 240         if (info->x_char) {
 241                 char c = info->x_char;
 242
 243                 console->write(console, &c, 1);
 244
 245                 info->state->icount.tx++;
 246                 info->x_char = 0;
 247
 248                 goto out;
 249         }
 250
 251         if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) {
 252 #ifdef SIMSERIAL_DEBUG
 253                 printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
 254                        info->xmit.head, info->xmit.tail, info->tty->stopped);
 255 #endif
 256                 goto out;
 257         }
 258         /*
 259          * We removed the loop and try to do it in to chunks. We need
 260          * 2 operations maximum because it's a ring buffer.
 261          *
 262          * First from current to tail if possible.
 263          * Then from the beginning of the buffer until necessary
 264          */
 265
 266         count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE),
 267                     SERIAL_XMIT_SIZE - info->xmit.tail);
 268         console->write(console, info->xmit.buf+info->xmit.tail, count);
 269
 270         info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1);
 271
 272         /*
 273          * We have more at the beginning of the buffer
 274          */
 275         count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 276         if (count) {
 277                 console->write(console, info->xmit.buf, count);
 278                 info->xmit.tail += count;
 279         }
 280 out:
 281         local_irq_restore(flags);
 282 }
 283
 284 static void rs_flush_chars(struct tty_struct *tty)
 285 {
 286         struct async_struct *info = (struct async_struct *)tty->driver_data;
 287
 288         if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped ||
 289             !info->xmit.buf)
 290                 return;
 291
 292         transmit_chars(info, NULL);
 293 }
 294
 295
 296 static int rs_write(struct tty_struct * tty,
 297                     const unsigned char *buf, int count)
 298 {
 299         int     c, ret = 0;
 300         struct async_struct *info = (struct async_struct *)tty->driver_data;
 301         unsigned long flags;
 302
 303         if (!tty || !info->xmit.buf || !tmp_buf) return 0;
 304
 305         local_irq_save(flags);
 306         while (1) {
 307                 c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 308                 if (count < c)
 309                         c = count;
 310                 if (c <= 0) {
 311                         break;
 312                 }
 313                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 314                 info->xmit.head = ((info->xmit.head + c) &
 315                                    (SERIAL_XMIT_SIZE-1));
 316                 buf += c;
 317                 count -= c;
 318                 ret += c;
 319         }
 320         local_irq_restore(flags);
 321         /*
 322          * Hey, we transmit directly from here in our case
 323          */
 324         if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE)
 325             && !tty->stopped && !tty->hw_stopped) {
 326                 transmit_chars(info, NULL);
 327         }
 328         return ret;
 329 }
 330
 331 static int rs_write_room(struct tty_struct *tty)
 332 {
 333         struct async_struct *info = (struct async_struct *)tty->driver_data;
 334
 335         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 336 }
 337
 338 static int rs_chars_in_buffer(struct tty_struct *tty)
 339 {
 340         struct async_struct *info = (struct async_struct *)tty->driver_data;
 341
 342         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 343 }
 344
 345 static void rs_flush_buffer(struct tty_struct *tty)
 346 {
 347         struct async_struct *info = (struct async_struct *)tty->driver_data;
 348         unsigned long flags;
 349
 350         local_irq_save(flags);
 351         info->xmit.head = info->xmit.tail = 0;
 352         local_irq_restore(flags);
 353
 354         wake_up_interruptible(&tty->write_wait);
 355
 356         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
 357             tty->ldisc.write_wakeup)
 358                 (tty->ldisc.write_wakeup)(tty);
 359 }
 360
 361 /*
 362  * This function is used to send a high-priority XON/XOFF character to
 363  * the device
 364  */
 365 static void rs_send_xchar(struct tty_struct *tty, char ch)
 366 {
 367         struct async_struct *info = (struct async_struct *)tty->driver_data;
 368
 369         info->x_char = ch;
 370         if (ch) {
 371                 /*
 372                  * I guess we could call console->write() directly but
 373                  * let's do that for now.
 374                  */
 375                 transmit_chars(info, NULL);
 376         }
 377 }
 378
 379 /*
 380  * ------------------------------------------------------------
 381  * rs_throttle()
 382  *
 383  * This routine is called by the upper-layer tty layer to signal that
 384  * incoming characters should be throttled.
 385  * ------------------------------------------------------------
 386  */
 387 static void rs_throttle(struct tty_struct * tty)
 388 {
 389         if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty));
 390
 391         printk(KERN_INFO "simrs_throttle called\n");
 392 }
 393
 394 static void rs_unthrottle(struct tty_struct * tty)
 395 {
 396         struct async_struct *info = (struct async_struct *)tty->driver_data;
 397
 398         if (I_IXOFF(tty)) {
 399                 if (info->x_char)
 400                         info->x_char = 0;
 401                 else
 402                         rs_send_xchar(tty, START_CHAR(tty));
 403         }
 404         printk(KERN_INFO "simrs_unthrottle called\n");
 405 }
 406
 407 /*
 408  * rs_break() --- routine which turns the break handling on or off
 409  */
 410 static void rs_break(struct tty_struct *tty, int break_state)
 411 {
 412 }
 413
 414 static int rs_ioctl(struct tty_struct *tty, struct file * file,
 415                     unsigned int cmd, unsigned long arg)
 416 {
 417         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 418             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
 419             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
 420                 if (tty->flags & (1 << TTY_IO_ERROR))
 421                     return -EIO;
 422         }
 423
 424         switch (cmd) {
 425                 case TIOCMGET:
 426                         printk(KERN_INFO "rs_ioctl: TIOCMGET called\n");
 427                         return -EINVAL;
 428                 case TIOCMBIS:
 429                 case TIOCMBIC:
 430                 case TIOCMSET:
 431                         printk(KERN_INFO "rs_ioctl: TIOCMBIS/BIC/SET called\n");
 432                         return -EINVAL;
 433                 case TIOCGSERIAL:
 434                         printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n");
 435                         return 0;
 436                 case TIOCSSERIAL:
 437                         printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n");
 438                         return 0;
 439                 case TIOCSERCONFIG:
 440                         printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n");
 441                         return -EINVAL;
 442
 443                 case TIOCSERGETLSR: /* Get line status register */
 444                         printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n");
 445                         return  -EINVAL;
 446
 447                 case TIOCSERGSTRUCT:
 448                         printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n");
 449 #if 0
 450                         if (copy_to_user((struct async_struct *) arg,
 451                                          info, sizeof(struct async_struct)))
 452                                 return -EFAULT;
 453 #endif
 454                         return 0;
 455
 456                 /*
 457                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
 458                  * - mask passed in arg for lines of interest
 459                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
 460                  * Caller should use TIOCGICOUNT to see which one it was
 461                  */
 462                 case TIOCMIWAIT:
 463                         printk(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\n");
 464                         return 0;
 465                 /*
 466                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
 467                  * Return: write counters to the user passed counter struct
 468                  * NB: both 1->0 and 0->1 transitions are counted except for
 469                  *     RI where only 0->1 is counted.
 470                  */
 471                 case TIOCGICOUNT:
 472                         printk(KERN_INFO "rs_ioctl: TIOCGICOUNT called\n");
 473                         return 0;
 474
 475                 case TIOCSERGWILD:
 476                 case TIOCSERSWILD:
 477                         /* "setserial -W" is called in Debian boot */
 478                         printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n");
 479                         return 0;
 480
 481                 default:
 482                         return -ENOIOCTLCMD;
 483                 }
 484         return 0;
 485 }
 486
 487 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 488
 489 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 490 {
 491         unsigned int cflag = tty->termios->c_cflag;
 492
 493         if (   (cflag == old_termios->c_cflag)
 494             && (   RELEVANT_IFLAG(tty->termios->c_iflag)
 495                 == RELEVANT_IFLAG(old_termios->c_iflag)))
 496           return;
 497
 498
 499         /* Handle turning off CRTSCTS */
 500         if ((old_termios->c_cflag & CRTSCTS) &&
 501             !(tty->termios->c_cflag & CRTSCTS)) {
 502                 tty->hw_stopped = 0;
 503                 rs_start(tty);
 504         }
 505 }
 506 /*
 507  * This routine will shutdown a serial port; interrupts are disabled, and
 508  * DTR is dropped if the hangup on close termio flag is on.
 509  */
 510 static void shutdown(struct async_struct * info)
 511 {
 512         unsigned long   flags;
 513         struct serial_state *state;
 514         int             retval;
 515
 516         if (!(info->flags & ASYNC_INITIALIZED)) return;
 517
 518         state = info->state;
 519
 520 #ifdef SIMSERIAL_DEBUG
 521         printk("Shutting down serial port %d (irq %d)....", info->line,
 522                state->irq);
 523 #endif
 524
 525         local_irq_save(flags);
 526         {
 527                 /*
 528                  * First unlink the serial port from the IRQ chain...
 529                  */
 530                 if (info->next_port)
 531                         info->next_port->prev_port = info->prev_port;
 532                 if (info->prev_port)
 533                         info->prev_port->next_port = info->next_port;
 534                 else
 535                         IRQ_ports[state->irq] = info->next_port;
 536
 537                 /*
 538                  * Free the IRQ, if necessary
 539                  */
 540                 if (state->irq && (!IRQ_ports[state->irq] ||
 541                                    !IRQ_ports[state->irq]->next_port)) {
 542                         if (IRQ_ports[state->irq]) {
 543                                 free_irq(state->irq, NULL);
 544                                 retval = request_irq(state->irq, rs_interrupt_single,
 545                                                      IRQ_T(info), "serial", NULL);
 546
 547                                 if (retval)
 548                                         printk(KERN_ERR "serial shutdown: request_irq: error %d"
 549                                                "  Couldn't reacquire IRQ.\n", retval);
 550                         } else
 551                                 free_irq(state->irq, NULL);
 552                 }
 553
 554                 if (info->xmit.buf) {
 555                         free_page((unsigned long) info->xmit.buf);
 556                         info->xmit.buf = NULL;
 557                 }
 558
 559                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
 560
 561                 info->flags &= ~ASYNC_INITIALIZED;
 562         }
 563         local_irq_restore(flags);
 564 }
 565
 566 /*
 567  * ------------------------------------------------------------
 568  * rs_close()
 569  *
 570  * This routine is called when the serial port gets closed.  First, we
 571  * wait for the last remaining data to be sent.  Then, we unlink its
 572  * async structure from the interrupt chain if necessary, and we free
 573  * that IRQ if nothing is left in the chain.
 574  * ------------------------------------------------------------
 575  */
 576 static void rs_close(struct tty_struct *tty, struct file * filp)
 577 {
 578         struct async_struct * info = (struct async_struct *)tty->driver_data;
 579         struct serial_state *state;
 580         unsigned long flags;
 581
 582         if (!info ) return;
 583
 584         state = info->state;
 585
 586         local_irq_save(flags);
 587         if (tty_hung_up_p(filp)) {
 588 #ifdef SIMSERIAL_DEBUG
 589                 printk("rs_close: hung_up\n");
 590 #endif
 591                 local_irq_restore(flags);
 592                 return;
 593         }
 594 #ifdef SIMSERIAL_DEBUG
 595         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
 596 #endif
 597         if ((tty->count == 1) && (state->count != 1)) {
 598                 /*
 599                  * Uh, oh.  tty->count is 1, which means that the tty
 600                  * structure will be freed.  state->count should always
 601                  * be one in these conditions.  If it's greater than
 602                  * one, we've got real problems, since it means the
 603                  * serial port won't be shutdown.
 604                  */
 605                 printk(KERN_ERR "rs_close: bad serial port count; tty->count is 1, "
 606                        "state->count is %d\n", state->count);
 607                 state->count = 1;
 608         }
 609         if (--state->count < 0) {
 610                 printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
 611                        info->line, state->count);
 612                 state->count = 0;
 613         }
 614         if (state->count) {
 615                 local_irq_restore(flags);
 616                 return;
 617         }
 618         info->flags |= ASYNC_CLOSING;
 619         local_irq_restore(flags);
 620
 621         /*
 622          * Now we wait for the transmit buffer to clear; and we notify
 623          * the line discipline to only process XON/XOFF characters.
 624          */
 625         shutdown(info);
 626         if (tty->ops->flush_buffer)
 627                 tty->ops->flush_buffer(tty);
 628         if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty);
 629         info->event = 0;
 630         info->tty = NULL;
 631         if (info->blocked_open) {
 632                 if (info->close_delay)
 633                         schedule_timeout_interruptible(info->close_delay);
 634                 wake_up_interruptible(&info->open_wait);
 635         }
 636         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 637         wake_up_interruptible(&info->close_wait);
 638 }
 639
 640 /*
 641  * rs_wait_until_sent() --- wait until the transmitter is empty
 642  */
 643 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
 644 {
 645 }
 646
 647
 648 /*
 649  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
 650  */
 651 static void rs_hangup(struct tty_struct *tty)
 652 {
 653         struct async_struct * info = (struct async_struct *)tty->driver_data;
 654         struct serial_state *state = info->state;
 655
 656 #ifdef SIMSERIAL_DEBUG
 657         printk("rs_hangup: called\n");
 658 #endif
 659
 660         state = info->state;
 661
 662         rs_flush_buffer(tty);
 663         if (info->flags & ASYNC_CLOSING)
 664                 return;
 665         shutdown(info);
 666
 667         info->event = 0;
 668         state->count = 0;
 669         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 670         info->tty = NULL;
 671         wake_up_interruptible(&info->open_wait);
 672 }
 673
 674
 675 static int get_async_struct(int line, struct async_struct **ret_info)
 676 {
 677         struct async_struct *info;
 678         struct serial_state *sstate;
 679
 680         sstate = rs_table + line;
 681         sstate->count++;
 682         if (sstate->info) {
 683                 *ret_info = sstate->info;
 684                 return 0;
 685         }
 686         info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
 687         if (!info) {
 688                 sstate->count--;
 689                 return -ENOMEM;
 690         }
 691         init_waitqueue_head(&info->open_wait);
 692         init_waitqueue_head(&info->close_wait);
 693         init_waitqueue_head(&info->delta_msr_wait);
 694         info->magic = SERIAL_MAGIC;
 695         info->port = sstate->port;
 696         info->flags = sstate->flags;
 697         info->xmit_fifo_size = sstate->xmit_fifo_size;
 698         info->line = line;
 699         INIT_WORK(&info->work, do_softint);
 700         info->state = sstate;
 701         if (sstate->info) {
 702                 kfree(info);
 703                 *ret_info = sstate->info;
 704                 return 0;
 705         }
 706         *ret_info = sstate->info = info;
 707         return 0;
 708 }
 709
 710 static int
 711 startup(struct async_struct *info)
 712 {
 713         unsigned long flags;
 714         int     retval=0;
 715         irq_handler_t handler;
 716         struct serial_state *state= info->state;
 717         unsigned long page;
 718
 719         page = get_zeroed_page(GFP_KERNEL);
 720         if (!page)
 721                 return -ENOMEM;
 722
 723         local_irq_save(flags);
 724
 725         if (info->flags & ASYNC_INITIALIZED) {
 726                 free_page(page);
 727                 goto errout;
 728         }
 729
 730         if (!state->port || !state->type) {
 731                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
 732                 free_page(page);
 733                 goto errout;
 734         }
 735         if (info->xmit.buf)
 736                 free_page(page);
 737         else
 738                 info->xmit.buf = (unsigned char *) page;
 739
 740 #ifdef SIMSERIAL_DEBUG
 741         printk("startup: ttys%d (irq %d)...", info->line, state->irq);
 742 #endif
 743
 744         /*
 745          * Allocate the IRQ if necessary
 746          */
 747         if (state->irq && (!IRQ_ports[state->irq] ||
 748                           !IRQ_ports[state->irq]->next_port)) {
 749                 if (IRQ_ports[state->irq]) {
 750                         retval = -EBUSY;
 751                         goto errout;
 752                 } else
 753                         handler = rs_interrupt_single;
 754
 755                 retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", NULL);
 756                 if (retval) {
 757                         if (capable(CAP_SYS_ADMIN)) {
 758                                 if (info->tty)
 759                                         set_bit(TTY_IO_ERROR,
 760                                                 &info->tty->flags);
 761                                 retval = 0;
 762                         }
 763                         goto errout;
 764                 }
 765         }
 766
 767         /*
 768          * Insert serial port into IRQ chain.
 769          */
 770         info->prev_port = NULL;
 771         info->next_port = IRQ_ports[state->irq];
 772         if (info->next_port)
 773                 info->next_port->prev_port = info;
 774         IRQ_ports[state->irq] = info;
 775
 776         if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags);
 777
 778         info->xmit.head = info->xmit.tail = 0;
 779
 780 #if 0
 781         /*
 782          * Set up serial timers...
 783          */
 784         timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
 785         timer_active |= 1 << RS_TIMER;
 786 #endif
 787
 788         /*
 789          * Set up the tty->alt_speed kludge
 790          */
 791         if (info->tty) {
 792                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 793                         info->tty->alt_speed = 57600;
 794                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 795                         info->tty->alt_speed = 115200;
 796                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 797                         info->tty->alt_speed = 230400;
 798                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 799                         info->tty->alt_speed = 460800;
 800         }
 801
 802         info->flags |= ASYNC_INITIALIZED;
 803         local_irq_restore(flags);
 804         return 0;
 805
 806 errout:
 807         local_irq_restore(flags);
 808         return retval;
 809 }
 810
 811
 812 /*
 813  * This routine is called whenever a serial port is opened.  It
 814  * enables interrupts for a serial port, linking in its async structure into
 815  * the IRQ chain.   It also performs the serial-specific
 816  * initialization for the tty structure.
 817  */
 818 static int rs_open(struct tty_struct *tty, struct file * filp)
 819 {
 820         struct async_struct     *info;
 821         int                     retval, line;
 822         unsigned long           page;
 823
 824         line = tty->index;
 825         if ((line < 0) || (line >= NR_PORTS))
 826                 return -ENODEV;
 827         retval = get_async_struct(line, &info);
 828         if (retval)
 829                 return retval;
 830         tty->driver_data = info;
 831         info->tty = tty;
 832
 833 #ifdef SIMSERIAL_DEBUG
 834         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
 835 #endif
 836         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 837
 838         if (!tmp_buf) {
 839                 page = get_zeroed_page(GFP_KERNEL);
 840                 if (!page)
 841                         return -ENOMEM;
 842                 if (tmp_buf)
 843                         free_page(page);
 844                 else
 845                         tmp_buf = (unsigned char *) page;
 846         }
 847
 848         /*
 849          * If the port is the middle of closing, bail out now
 850          */
 851         if (tty_hung_up_p(filp) ||
 852             (info->flags & ASYNC_CLOSING)) {
 853                 if (info->flags & ASYNC_CLOSING)
 854                         interruptible_sleep_on(&info->close_wait);
 855 #ifdef SERIAL_DO_RESTART
 856                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
 857                         -EAGAIN : -ERESTARTSYS);
 858 #else
 859                 return -EAGAIN;
 860 #endif
 861         }
 862
 863         /*
 864          * Start up serial port
 865          */
 866         retval = startup(info);
 867         if (retval) {
 868                 return retval;
 869         }
 870
 871         /*
 872          * figure out which console to use (should be one already)
 873          */
 874         console = console_drivers;
 875         while (console) {
 876                 if ((console->flags & CON_ENABLED) && console->write) break;
 877                 console = console->next;
 878         }
 879
 880 #ifdef SIMSERIAL_DEBUG
 881         printk("rs_open ttys%d successful\n", info->line);
 882 #endif
 883         return 0;
 884 }
 885
 886 /*
 887  * /proc fs routines....
 888  */
 889
 890 static inline int line_info(char *buf, struct serial_state *state)
 891 {
 892         return sprintf(buf, "%d: uart:%s port:%lX irq:%d\n",
 893                        state->line, uart_config[state->type].name,
 894                        state->port, state->irq);
 895 }
 896
 897 static int rs_read_proc(char *page, char **start, off_t off, int count,
 898                  int *eof, void *data)
 899 {
 900         int i, len = 0, l;
 901         off_t   begin = 0;
 902
 903         len += sprintf(page, "simserinfo:1.0 driver:%s\n", serial_version);
 904         for (i = 0; i < NR_PORTS && len < 4000; i++) {
 905                 l = line_info(page + len, &rs_table[i]);
 906                 len += l;
 907                 if (len+begin > off+count)
 908                         goto done;
 909                 if (len+begin < off) {
 910                         begin += len;
 911                         len = 0;
 912                 }
 913         }
 914         *eof = 1;
 915 done:
 916         if (off >= len+begin)
 917                 return 0;
 918         *start = page + (begin-off);
 919         return ((count < begin+len-off) ? count : begin+len-off);
 920 }
 921
 922 /*
 923  * ---------------------------------------------------------------------
 924  * rs_init() and friends
 925  *
 926  * rs_init() is called at boot-time to initialize the serial driver.
 927  * ---------------------------------------------------------------------
 928  */
 929
 930 /*
 931  * This routine prints out the appropriate serial driver version
 932  * number, and identifies which options were configured into this
 933  * driver.
 934  */
 935 static inline void show_serial_version(void)
 936 {
 937         printk(KERN_INFO "%s version %s with", serial_name, serial_version);
 938         printk(KERN_INFO " no serial options enabled\n");
 939 }
 940
 941 static const struct tty_operations hp_ops = {
 942         .open = rs_open,
 943         .close = rs_close,
 944         .write = rs_write,
 945         .put_char = rs_put_char,
 946         .flush_chars = rs_flush_chars,
 947         .write_room = rs_write_room,
 948         .chars_in_buffer = rs_chars_in_buffer,
 949         .flush_buffer = rs_flush_buffer,
 950         .ioctl = rs_ioctl,
 951         .throttle = rs_throttle,
 952         .unthrottle = rs_unthrottle,
 953         .send_xchar = rs_send_xchar,
 954         .set_termios = rs_set_termios,
 955         .stop = rs_stop,
 956         .start = rs_start,
 957         .hangup = rs_hangup,
 958         .break_ctl = rs_break,
 959         .wait_until_sent = rs_wait_until_sent,
 960         .read_proc = rs_read_proc,
 961 };
 962
 963 /*
 964  * The serial driver boot-time initialization code!
 965  */
 966 static int __init
 967 simrs_init (void)
 968 {
 969         int                     i, rc;
 970         struct serial_state     *state;
 971
 972         if (!ia64_platform_is("hpsim"))
 973                 return -ENODEV;
 974
 975         hp_simserial_driver = alloc_tty_driver(1);
 976         if (!hp_simserial_driver)
 977                 return -ENOMEM;
 978
 979         show_serial_version();
 980
 981         /* Initialize the tty_driver structure */
 982
 983         hp_simserial_driver->owner = THIS_MODULE;
 984         hp_simserial_driver->driver_name = "simserial";
 985         hp_simserial_driver->name = "ttyS";
 986         hp_simserial_driver->major = TTY_MAJOR;
 987         hp_simserial_driver->minor_start = 64;
 988         hp_simserial_driver->type = TTY_DRIVER_TYPE_SERIAL;
 989         hp_simserial_driver->subtype = SERIAL_TYPE_NORMAL;
 990         hp_simserial_driver->init_termios = tty_std_termios;
 991         hp_simserial_driver->init_termios.c_cflag =
 992                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 993         hp_simserial_driver->flags = TTY_DRIVER_REAL_RAW;
 994         tty_set_operations(hp_simserial_driver, &hp_ops);
 995
 996         /*
 997          * Let's have a little bit of fun !
 998          */
 999         for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
1000
1001                 if (state->type == PORT_UNKNOWN) continue;
1002
1003                 if (!state->irq) {
1004                         if ((rc = assign_irq_vector(AUTO_ASSIGN)) < 0)
1005                                 panic("%s: out of interrupt vectors!\n",
1006                                       __func__);
1007                         state->irq = rc;
1008                         ia64_ssc_connect_irq(KEYBOARD_INTR, state->irq);
1009                 }
1010
1011                 printk(KERN_INFO "ttyS%d at 0x%04lx (irq = %d) is a %s\n",
1012                        state->line,
1013                        state->port, state->irq,
1014                        uart_config[state->type].name);
1015         }
1016
1017         if (tty_register_driver(hp_simserial_driver))
1018                 panic("Couldn't register simserial driver\n");
1019
1020         return 0;
1021 }
1022
1023 #ifndef MODULE
1024 __initcall(simrs_init);
1025 #endif