Pileus Git - ~andy/linux/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/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->tport.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->tport.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 tty_struct *tty, struct serial_state *info,
 206                 int *intr_done)
 207 {
 208         int count;
 209         unsigned long flags;
 210
 211         local_irq_save(flags);
 212
 213         if (info->x_char) {
 214                 char c = info->x_char;
 215
 216                 console->write(console, &c, 1);
 217
 218                 info->icount.tx++;
 219                 info->x_char = 0;
 220
 221                 goto out;
 222         }
 223
 224         if (info->xmit.head == info->xmit.tail || tty->stopped ||
 225                         tty->hw_stopped) {
 226 #ifdef SIMSERIAL_DEBUG
 227                 printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
 228                        info->xmit.head, info->xmit.tail, tty->stopped);
 229 #endif
 230                 goto out;
 231         }
 232         /*
 233          * We removed the loop and try to do it in to chunks. We need
 234          * 2 operations maximum because it's a ring buffer.
 235          *
 236          * First from current to tail if possible.
 237          * Then from the beginning of the buffer until necessary
 238          */
 239
 240         count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE),
 241                     SERIAL_XMIT_SIZE - info->xmit.tail);
 242         console->write(console, info->xmit.buf+info->xmit.tail, count);
 243
 244         info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1);
 245
 246         /*
 247          * We have more at the beginning of the buffer
 248          */
 249         count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 250         if (count) {
 251                 console->write(console, info->xmit.buf, count);
 252                 info->xmit.tail += count;
 253         }
 254 out:
 255         local_irq_restore(flags);
 256 }
 257
 258 static void rs_flush_chars(struct tty_struct *tty)
 259 {
 260         struct serial_state *info = tty->driver_data;
 261
 262         if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped ||
 263             !info->xmit.buf)
 264                 return;
 265
 266         transmit_chars(tty, info, NULL);
 267 }
 268
 269
 270 static int rs_write(struct tty_struct * tty,
 271                     const unsigned char *buf, int count)
 272 {
 273         struct serial_state *info = tty->driver_data;
 274         int     c, ret = 0;
 275         unsigned long flags;
 276
 277         if (!tty || !info->xmit.buf || !tmp_buf) return 0;
 278
 279         local_irq_save(flags);
 280         while (1) {
 281                 c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 282                 if (count < c)
 283                         c = count;
 284                 if (c <= 0) {
 285                         break;
 286                 }
 287                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 288                 info->xmit.head = ((info->xmit.head + c) &
 289                                    (SERIAL_XMIT_SIZE-1));
 290                 buf += c;
 291                 count -= c;
 292                 ret += c;
 293         }
 294         local_irq_restore(flags);
 295         /*
 296          * Hey, we transmit directly from here in our case
 297          */
 298         if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE)
 299             && !tty->stopped && !tty->hw_stopped) {
 300                 transmit_chars(tty, info, NULL);
 301         }
 302         return ret;
 303 }
 304
 305 static int rs_write_room(struct tty_struct *tty)
 306 {
 307         struct serial_state *info = tty->driver_data;
 308
 309         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 310 }
 311
 312 static int rs_chars_in_buffer(struct tty_struct *tty)
 313 {
 314         struct serial_state *info = tty->driver_data;
 315
 316         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 317 }
 318
 319 static void rs_flush_buffer(struct tty_struct *tty)
 320 {
 321         struct serial_state *info = tty->driver_data;
 322         unsigned long flags;
 323
 324         local_irq_save(flags);
 325         info->xmit.head = info->xmit.tail = 0;
 326         local_irq_restore(flags);
 327
 328         tty_wakeup(tty);
 329 }
 330
 331 /*
 332  * This function is used to send a high-priority XON/XOFF character to
 333  * the device
 334  */
 335 static void rs_send_xchar(struct tty_struct *tty, char ch)
 336 {
 337         struct serial_state *info = tty->driver_data;
 338
 339         info->x_char = ch;
 340         if (ch) {
 341                 /*
 342                  * I guess we could call console->write() directly but
 343                  * let's do that for now.
 344                  */
 345                 transmit_chars(tty, info, NULL);
 346         }
 347 }
 348
 349 /*
 350  * ------------------------------------------------------------
 351  * rs_throttle()
 352  *
 353  * This routine is called by the upper-layer tty layer to signal that
 354  * incoming characters should be throttled.
 355  * ------------------------------------------------------------
 356  */
 357 static void rs_throttle(struct tty_struct * tty)
 358 {
 359         if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty));
 360
 361         printk(KERN_INFO "simrs_throttle called\n");
 362 }
 363
 364 static void rs_unthrottle(struct tty_struct * tty)
 365 {
 366         struct serial_state *info = tty->driver_data;
 367
 368         if (I_IXOFF(tty)) {
 369                 if (info->x_char)
 370                         info->x_char = 0;
 371                 else
 372                         rs_send_xchar(tty, START_CHAR(tty));
 373         }
 374         printk(KERN_INFO "simrs_unthrottle called\n");
 375 }
 376
 377
 378 static int rs_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
 379 {
 380         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 381             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
 382             (cmd != TIOCMIWAIT)) {
 383                 if (tty->flags & (1 << TTY_IO_ERROR))
 384                     return -EIO;
 385         }
 386
 387         switch (cmd) {
 388                 case TIOCGSERIAL:
 389                         printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n");
 390                         return 0;
 391                 case TIOCSSERIAL:
 392                         printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n");
 393                         return 0;
 394                 case TIOCSERCONFIG:
 395                         printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n");
 396                         return -EINVAL;
 397
 398                 case TIOCSERGETLSR: /* Get line status register */
 399                         printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n");
 400                         return  -EINVAL;
 401
 402                 case TIOCSERGSTRUCT:
 403                         printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n");
 404 #if 0
 405                         if (copy_to_user((struct async_struct *) arg,
 406                                          info, sizeof(struct async_struct)))
 407                                 return -EFAULT;
 408 #endif
 409                         return 0;
 410
 411                 /*
 412                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
 413                  * - mask passed in arg for lines of interest
 414                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
 415                  * Caller should use TIOCGICOUNT to see which one it was
 416                  */
 417                 case TIOCMIWAIT:
 418                         printk(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\n");
 419                         return 0;
 420                 case TIOCSERGWILD:
 421                 case TIOCSERSWILD:
 422                         /* "setserial -W" is called in Debian boot */
 423                         printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n");
 424                         return 0;
 425
 426                 default:
 427                         return -ENOIOCTLCMD;
 428                 }
 429         return 0;
 430 }
 431
 432 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 433
 434 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 435 {
 436         /* Handle turning off CRTSCTS */
 437         if ((old_termios->c_cflag & CRTSCTS) &&
 438             !(tty->termios->c_cflag & CRTSCTS)) {
 439                 tty->hw_stopped = 0;
 440                 rs_start(tty);
 441         }
 442 }
 443 /*
 444  * This routine will shutdown a serial port; interrupts are disabled, and
 445  * DTR is dropped if the hangup on close termio flag is on.
 446  */
 447 static void shutdown(struct tty_struct *tty, struct serial_state *info)
 448 {
 449         unsigned long   flags;
 450
 451         if (!(info->tport.flags & ASYNC_INITIALIZED))
 452                 return;
 453
 454 #ifdef SIMSERIAL_DEBUG
 455         printk("Shutting down serial port %d (irq %d)...\n", info->line,
 456                info->irq);
 457 #endif
 458
 459         local_irq_save(flags);
 460         {
 461                 if (info->irq)
 462                         free_irq(info->irq, info);
 463
 464                 if (info->xmit.buf) {
 465                         free_page((unsigned long) info->xmit.buf);
 466                         info->xmit.buf = NULL;
 467                 }
 468
 469                 set_bit(TTY_IO_ERROR, &tty->flags);
 470
 471                 info->tport.flags &= ~ASYNC_INITIALIZED;
 472         }
 473         local_irq_restore(flags);
 474 }
 475
 476 /*
 477  * ------------------------------------------------------------
 478  * rs_close()
 479  *
 480  * This routine is called when the serial port gets closed.  First, we
 481  * wait for the last remaining data to be sent.  Then, we unlink its
 482  * async structure from the interrupt chain if necessary, and we free
 483  * that IRQ if nothing is left in the chain.
 484  * ------------------------------------------------------------
 485  */
 486 static void rs_close(struct tty_struct *tty, struct file * filp)
 487 {
 488         struct serial_state *info = tty->driver_data;
 489         unsigned long flags;
 490
 491         if (!info)
 492                 return;
 493
 494         local_irq_save(flags);
 495         if (tty_hung_up_p(filp)) {
 496 #ifdef SIMSERIAL_DEBUG
 497                 printk("rs_close: hung_up\n");
 498 #endif
 499                 local_irq_restore(flags);
 500                 return;
 501         }
 502 #ifdef SIMSERIAL_DEBUG
 503         printk("rs_close ttys%d, count = %d\n", info->line, info->tport.count);
 504 #endif
 505         if ((tty->count == 1) && (info->tport.count != 1)) {
 506                 /*
 507                  * Uh, oh.  tty->count is 1, which means that the tty
 508                  * structure will be freed.  info->tport.count should always
 509                  * be one in these conditions.  If it's greater than
 510                  * one, we've got real problems, since it means the
 511                  * serial port won't be shutdown.
 512                  */
 513                 printk(KERN_ERR "rs_close: bad serial port count; tty->count is 1, "
 514                        "info->tport.count is %d\n", info->tport.count);
 515                 info->tport.count = 1;
 516         }
 517         if (--info->tport.count < 0) {
 518                 printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
 519                        info->line, info->tport.count);
 520                 info->tport.count = 0;
 521         }
 522         if (info->tport.count) {
 523                 local_irq_restore(flags);
 524                 return;
 525         }
 526         info->tport.flags |= ASYNC_CLOSING;
 527         local_irq_restore(flags);
 528
 529         /*
 530          * Now we wait for the transmit buffer to clear; and we notify
 531          * the line discipline to only process XON/XOFF characters.
 532          */
 533         shutdown(tty, info);
 534         rs_flush_buffer(tty);
 535         tty_ldisc_flush(tty);
 536         info->tport.tty = NULL;
 537         if (info->tport.blocked_open) {
 538                 if (info->tport.close_delay)
 539                         schedule_timeout_interruptible(info->tport.close_delay);
 540                 wake_up_interruptible(&info->tport.open_wait);
 541         }
 542         info->tport.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 543         wake_up_interruptible(&info->tport.close_wait);
 544 }
 545
 546 /*
 547  * rs_wait_until_sent() --- wait until the transmitter is empty
 548  */
 549 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
 550 {
 551 }
 552
 553
 554 /*
 555  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
 556  */
 557 static void rs_hangup(struct tty_struct *tty)
 558 {
 559         struct serial_state *info = tty->driver_data;
 560
 561 #ifdef SIMSERIAL_DEBUG
 562         printk("rs_hangup: called\n");
 563 #endif
 564
 565         rs_flush_buffer(tty);
 566         if (info->tport.flags & ASYNC_CLOSING)
 567                 return;
 568         shutdown(tty, info);
 569
 570         info->tport.count = 0;
 571         info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
 572         info->tport.tty = NULL;
 573         wake_up_interruptible(&info->tport.open_wait);
 574 }
 575
 576
 577 static int startup(struct tty_struct *tty, struct serial_state *state)
 578 {
 579         struct tty_port *port = &state->tport;
 580         unsigned long flags;
 581         int     retval=0;
 582         unsigned long page;
 583
 584         page = get_zeroed_page(GFP_KERNEL);
 585         if (!page)
 586                 return -ENOMEM;
 587
 588         local_irq_save(flags);
 589
 590         if (port->flags & ASYNC_INITIALIZED) {
 591                 free_page(page);
 592                 goto errout;
 593         }
 594
 595         if (!state->port || !state->type) {
 596                 set_bit(TTY_IO_ERROR, &tty->flags);
 597                 free_page(page);
 598                 goto errout;
 599         }
 600         if (state->xmit.buf)
 601                 free_page(page);
 602         else
 603                 state->xmit.buf = (unsigned char *) page;
 604
 605 #ifdef SIMSERIAL_DEBUG
 606         printk("startup: ttys%d (irq %d)...", state->line, state->irq);
 607 #endif
 608
 609         /*
 610          * Allocate the IRQ if necessary
 611          */
 612         if (state->irq) {
 613                 retval = request_irq(state->irq, rs_interrupt_single, 0,
 614                                 "simserial", state);
 615                 if (retval)
 616                         goto errout;
 617         }
 618
 619         clear_bit(TTY_IO_ERROR, &tty->flags);
 620
 621         state->xmit.head = state->xmit.tail = 0;
 622
 623 #if 0
 624         /*
 625          * Set up serial timers...
 626          */
 627         timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
 628         timer_active |= 1 << RS_TIMER;
 629 #endif
 630
 631         /*
 632          * Set up the tty->alt_speed kludge
 633          */
 634         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 635                 tty->alt_speed = 57600;
 636         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 637                 tty->alt_speed = 115200;
 638         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 639                 tty->alt_speed = 230400;
 640         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 641                 tty->alt_speed = 460800;
 642
 643         port->flags |= ASYNC_INITIALIZED;
 644         local_irq_restore(flags);
 645         return 0;
 646
 647 errout:
 648         local_irq_restore(flags);
 649         return retval;
 650 }
 651
 652
 653 /*
 654  * This routine is called whenever a serial port is opened.  It
 655  * enables interrupts for a serial port, linking in its async structure into
 656  * the IRQ chain.   It also performs the serial-specific
 657  * initialization for the tty structure.
 658  */
 659 static int rs_open(struct tty_struct *tty, struct file * filp)
 660 {
 661         struct serial_state *info = rs_table + tty->index;
 662         int                     retval;
 663         unsigned long           page;
 664
 665         info->tport.count++;
 666         info->tport.tty = tty;
 667         tty->driver_data = info;
 668         tty->port = &info->tport;
 669
 670 #ifdef SIMSERIAL_DEBUG
 671         printk("rs_open %s, count = %d\n", tty->name, info->tport.count);
 672 #endif
 673         tty->low_latency = (info->tport.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->tport.flags & ASYNC_CLOSING)) {
 689                 if (info->tport.flags & ASYNC_CLOSING)
 690                         interruptible_sleep_on(&info->tport.close_wait);
 691 #ifdef SERIAL_DO_RESTART
 692                 return ((info->tport.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(tty, 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                 tty_port_init(&state->tport);
 833                 state->tport.close_delay = 0; /* XXX really 0? */
 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