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