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/config.h>
  20 #include <linux/init.h>
  21 #include <linux/errno.h>
  22 #include <linux/sched.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/major.h>
  26 #include <linux/fcntl.h>
  27 #include <linux/mm.h>
  28 #include <linux/slab.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 #ifdef CONFIG_KDB
  40 # include <linux/kdb.h>
  41 #endif
  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 #define SERIAL_INLINE   1
  49
  50 #ifdef SERIAL_INLINE
  51 #define _INLINE_ inline
  52 #endif
  53
  54 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
  55
  56 #define SSC_GETCHAR     21
  57
  58 extern long ia64_ssc (long, long, long, long, int);
  59 extern void ia64_ssc_connect_irq (long intr, long irq);
  60
  61 static char *serial_name = "SimSerial driver";
  62 static char *serial_version = "0.6";
  63
  64 /*
  65  * This has been extracted from asm/serial.h. We need one eventually but
  66  * I don't know exactly what we're going to put in it so just fake one
  67  * for now.
  68  */
  69 #define BASE_BAUD ( 1843200 / 16 )
  70
  71 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
  72
  73 /*
  74  * Most of the values here are meaningless to this particular driver.
  75  * However some values must be preserved for the code (leveraged from serial.c
  76  * to work correctly).
  77  * port must not be 0
  78  * type must not be UNKNOWN
  79  * So I picked arbitrary (guess from where?) values instead
  80  */
  81 static struct serial_state rs_table[NR_PORTS]={
  82   /* UART CLK   PORT IRQ     FLAGS        */
  83   { 0, BASE_BAUD, 0x3F8, 0, STD_COM_FLAGS,0,PORT_16550 }  /* ttyS0 */
  84 };
  85
  86 /*
  87  * Just for the fun of it !
  88  */
  89 static struct serial_uart_config uart_config[] = {
  90         { "unknown", 1, 0 },
  91         { "8250", 1, 0 },
  92         { "16450", 1, 0 },
  93         { "16550", 1, 0 },
  94         { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
  95         { "cirrus", 1, 0 },
  96         { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
  97         { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
  98                   UART_STARTECH },
  99         { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
 100         { 0, 0}
 101 };
 102
 103 struct tty_driver *hp_simserial_driver;
 104
 105 static struct async_struct *IRQ_ports[NR_IRQS];
 106
 107 static struct console *console;
 108
 109 static unsigned char *tmp_buf;
 110 static DECLARE_MUTEX(tmp_buf_sem);
 111
 112 extern struct console *console_drivers; /* from kernel/printk.c */
 113
 114 /*
 115  * ------------------------------------------------------------
 116  * rs_stop() and rs_start()
 117  *
 118  * This routines are called before setting or resetting tty->stopped.
 119  * They enable or disable transmitter interrupts, as necessary.
 120  * ------------------------------------------------------------
 121  */
 122 static void rs_stop(struct tty_struct *tty)
 123 {
 124 #ifdef SIMSERIAL_DEBUG
 125         printk("rs_stop: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
 126                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
 127 #endif
 128
 129 }
 130
 131 static void rs_start(struct tty_struct *tty)
 132 {
 133 #ifdef SIMSERIAL_DEBUG
 134         printk("rs_start: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
 135                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
 136 #endif
 137 }
 138
 139 static  void receive_chars(struct tty_struct *tty, struct pt_regs *regs)
 140 {
 141         unsigned char ch;
 142         static unsigned char seen_esc = 0;
 143
 144         while ( (ch = ia64_ssc(0, 0, 0, 0, SSC_GETCHAR)) ) {
 145                 if ( ch == 27 && seen_esc == 0 ) {
 146                         seen_esc = 1;
 147                         continue;
 148                 } else {
 149                         if ( seen_esc==1 && ch == 'O' ) {
 150                                 seen_esc = 2;
 151                                 continue;
 152                         } else if ( seen_esc == 2 ) {
 153                                 if ( ch == 'P' ) /* F1 */
 154                                         show_state();
 155 #ifdef CONFIG_MAGIC_SYSRQ
 156                                 if ( ch == 'S' ) { /* F4 */
 157                                         do
 158                                                 ch = ia64_ssc(0, 0, 0, 0,
 159                                                               SSC_GETCHAR);
 160                                         while (!ch);
 161                                         handle_sysrq(ch, regs, NULL);
 162                                 }
 163 #endif
 164                                 seen_esc = 0;
 165                                 continue;
 166                         }
 167                 }
 168                 seen_esc = 0;
 169                 if (tty->flip.count >= TTY_FLIPBUF_SIZE) break;
 170
 171                 *tty->flip.char_buf_ptr = ch;
 172
 173                 *tty->flip.flag_buf_ptr = 0;
 174
 175                 tty->flip.flag_buf_ptr++;
 176                 tty->flip.char_buf_ptr++;
 177                 tty->flip.count++;
 178         }
 179         tty_flip_buffer_push(tty);
 180 }
 181
 182 /*
 183  * This is the serial driver's interrupt routine for a single port
 184  */
 185 static irqreturn_t rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
 186 {
 187         struct async_struct * info;
 188
 189         /*
 190          * I don't know exactly why they don't use the dev_id opaque data
 191          * pointer instead of this extra lookup table
 192          */
 193         info = IRQ_ports[irq];
 194         if (!info || !info->tty) {
 195                 printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info);
 196                 return IRQ_NONE;
 197         }
 198         /*
 199          * pretty simple in our case, because we only get interrupts
 200          * on inbound traffic
 201          */
 202         receive_chars(info->tty, regs);
 203         return IRQ_HANDLED;
 204 }
 205
 206 /*
 207  * -------------------------------------------------------------------
 208  * Here ends the serial interrupt routines.
 209  * -------------------------------------------------------------------
 210  */
 211
 212 #if 0
 213 /*
 214  * not really used in our situation so keep them commented out for now
 215  */
 216 static DECLARE_TASK_QUEUE(tq_serial); /* used to be at the top of the file */
 217 static void do_serial_bh(void)
 218 {
 219         run_task_queue(&tq_serial);
 220         printk(KERN_ERR "do_serial_bh: called\n");
 221 }
 222 #endif
 223
 224 static void do_softint(void *private_)
 225 {
 226         printk(KERN_ERR "simserial: do_softint called\n");
 227 }
 228
 229 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
 230 {
 231         struct async_struct *info = (struct async_struct *)tty->driver_data;
 232         unsigned long flags;
 233
 234         if (!tty || !info->xmit.buf) return;
 235
 236         local_irq_save(flags);
 237         if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) {
 238                 local_irq_restore(flags);
 239                 return;
 240         }
 241         info->xmit.buf[info->xmit.head] = ch;
 242         info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
 243         local_irq_restore(flags);
 244 }
 245
 246 static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
 247 {
 248         int count;
 249         unsigned long flags;
 250
 251
 252         local_irq_save(flags);
 253
 254         if (info->x_char) {
 255                 char c = info->x_char;
 256
 257                 console->write(console, &c, 1);
 258
 259                 info->state->icount.tx++;
 260                 info->x_char = 0;
 261
 262                 goto out;
 263         }
 264
 265         if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) {
 266 #ifdef SIMSERIAL_DEBUG
 267                 printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
 268                        info->xmit.head, info->xmit.tail, info->tty->stopped);
 269 #endif
 270                 goto out;
 271         }
 272         /*
 273          * We removed the loop and try to do it in to chunks. We need
 274          * 2 operations maximum because it's a ring buffer.
 275          *
 276          * First from current to tail if possible.
 277          * Then from the beginning of the buffer until necessary
 278          */
 279
 280         count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE),
 281                     SERIAL_XMIT_SIZE - info->xmit.tail);
 282         console->write(console, info->xmit.buf+info->xmit.tail, count);
 283
 284         info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1);
 285
 286         /*
 287          * We have more at the beginning of the buffer
 288          */
 289         count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 290         if (count) {
 291                 console->write(console, info->xmit.buf, count);
 292                 info->xmit.tail += count;
 293         }
 294 out:
 295         local_irq_restore(flags);
 296 }
 297
 298 static void rs_flush_chars(struct tty_struct *tty)
 299 {
 300         struct async_struct *info = (struct async_struct *)tty->driver_data;
 301
 302         if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped ||
 303             !info->xmit.buf)
 304                 return;
 305
 306         transmit_chars(info, NULL);
 307 }
 308
 309
 310 static int rs_write(struct tty_struct * tty,
 311                     const unsigned char *buf, int count)
 312 {
 313         int     c, ret = 0;
 314         struct async_struct *info = (struct async_struct *)tty->driver_data;
 315         unsigned long flags;
 316
 317         if (!tty || !info->xmit.buf || !tmp_buf) return 0;
 318
 319         local_irq_save(flags);
 320         while (1) {
 321                 c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 322                 if (count < c)
 323                         c = count;
 324                 if (c <= 0) {
 325                         break;
 326                 }
 327                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 328                 info->xmit.head = ((info->xmit.head + c) &
 329                                    (SERIAL_XMIT_SIZE-1));
 330                 buf += c;
 331                 count -= c;
 332                 ret += c;
 333         }
 334         local_irq_restore(flags);
 335         /*
 336          * Hey, we transmit directly from here in our case
 337          */
 338         if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE)
 339             && !tty->stopped && !tty->hw_stopped) {
 340                 transmit_chars(info, NULL);
 341         }
 342         return ret;
 343 }
 344
 345 static int rs_write_room(struct tty_struct *tty)
 346 {
 347         struct async_struct *info = (struct async_struct *)tty->driver_data;
 348
 349         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 350 }
 351
 352 static int rs_chars_in_buffer(struct tty_struct *tty)
 353 {
 354         struct async_struct *info = (struct async_struct *)tty->driver_data;
 355
 356         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 357 }
 358
 359 static void rs_flush_buffer(struct tty_struct *tty)
 360 {
 361         struct async_struct *info = (struct async_struct *)tty->driver_data;
 362         unsigned long flags;
 363
 364         local_irq_save(flags);
 365         info->xmit.head = info->xmit.tail = 0;
 366         local_irq_restore(flags);
 367
 368         wake_up_interruptible(&tty->write_wait);
 369
 370         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
 371             tty->ldisc.write_wakeup)
 372                 (tty->ldisc.write_wakeup)(tty);
 373 }
 374
 375 /*
 376  * This function is used to send a high-priority XON/XOFF character to
 377  * the device
 378  */
 379 static void rs_send_xchar(struct tty_struct *tty, char ch)
 380 {
 381         struct async_struct *info = (struct async_struct *)tty->driver_data;
 382
 383         info->x_char = ch;
 384         if (ch) {
 385                 /*
 386                  * I guess we could call console->write() directly but
 387                  * let's do that for now.
 388                  */
 389                 transmit_chars(info, NULL);
 390         }
 391 }
 392
 393 /*
 394  * ------------------------------------------------------------
 395  * rs_throttle()
 396  *
 397  * This routine is called by the upper-layer tty layer to signal that
 398  * incoming characters should be throttled.
 399  * ------------------------------------------------------------
 400  */
 401 static void rs_throttle(struct tty_struct * tty)
 402 {
 403         if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty));
 404
 405         printk(KERN_INFO "simrs_throttle called\n");
 406 }
 407
 408 static void rs_unthrottle(struct tty_struct * tty)
 409 {
 410         struct async_struct *info = (struct async_struct *)tty->driver_data;
 411
 412         if (I_IXOFF(tty)) {
 413                 if (info->x_char)
 414                         info->x_char = 0;
 415                 else
 416                         rs_send_xchar(tty, START_CHAR(tty));
 417         }
 418         printk(KERN_INFO "simrs_unthrottle called\n");
 419 }
 420
 421 /*
 422  * rs_break() --- routine which turns the break handling on or off
 423  */
 424 static void rs_break(struct tty_struct *tty, int break_state)
 425 {
 426 }
 427
 428 static int rs_ioctl(struct tty_struct *tty, struct file * file,
 429                     unsigned int cmd, unsigned long arg)
 430 {
 431         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 432             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
 433             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
 434                 if (tty->flags & (1 << TTY_IO_ERROR))
 435                     return -EIO;
 436         }
 437
 438         switch (cmd) {
 439                 case TIOCMGET:
 440                         printk(KERN_INFO "rs_ioctl: TIOCMGET called\n");
 441                         return -EINVAL;
 442                 case TIOCMBIS:
 443                 case TIOCMBIC:
 444                 case TIOCMSET:
 445                         printk(KERN_INFO "rs_ioctl: TIOCMBIS/BIC/SET called\n");
 446                         return -EINVAL;
 447                 case TIOCGSERIAL:
 448                         printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n");
 449                         return 0;
 450                 case TIOCSSERIAL:
 451                         printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n");
 452                         return 0;
 453                 case TIOCSERCONFIG:
 454                         printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n");
 455                         return -EINVAL;
 456
 457                 case TIOCSERGETLSR: /* Get line status register */
 458                         printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n");
 459                         return  -EINVAL;
 460
 461                 case TIOCSERGSTRUCT:
 462                         printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n");
 463 #if 0
 464                         if (copy_to_user((struct async_struct *) arg,
 465                                          info, sizeof(struct async_struct)))
 466                                 return -EFAULT;
 467 #endif
 468                         return 0;
 469
 470                 /*
 471                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
 472                  * - mask passed in arg for lines of interest
 473                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
 474                  * Caller should use TIOCGICOUNT to see which one it was
 475                  */
 476                 case TIOCMIWAIT:
 477                         printk(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\n");
 478                         return 0;
 479                 /*
 480                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
 481                  * Return: write counters to the user passed counter struct
 482                  * NB: both 1->0 and 0->1 transitions are counted except for
 483                  *     RI where only 0->1 is counted.
 484                  */
 485                 case TIOCGICOUNT:
 486                         printk(KERN_INFO "rs_ioctl: TIOCGICOUNT called\n");
 487                         return 0;
 488
 489                 case TIOCSERGWILD:
 490                 case TIOCSERSWILD:
 491                         /* "setserial -W" is called in Debian boot */
 492                         printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n");
 493                         return 0;
 494
 495                 default:
 496                         return -ENOIOCTLCMD;
 497                 }
 498         return 0;
 499 }
 500
 501 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 502
 503 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
 504 {
 505         unsigned int cflag = tty->termios->c_cflag;
 506
 507         if (   (cflag == old_termios->c_cflag)
 508             && (   RELEVANT_IFLAG(tty->termios->c_iflag)
 509                 == RELEVANT_IFLAG(old_termios->c_iflag)))
 510           return;
 511
 512
 513         /* Handle turning off CRTSCTS */
 514         if ((old_termios->c_cflag & CRTSCTS) &&
 515             !(tty->termios->c_cflag & CRTSCTS)) {
 516                 tty->hw_stopped = 0;
 517                 rs_start(tty);
 518         }
 519 }
 520 /*
 521  * This routine will shutdown a serial port; interrupts are disabled, and
 522  * DTR is dropped if the hangup on close termio flag is on.
 523  */
 524 static void shutdown(struct async_struct * info)
 525 {
 526         unsigned long   flags;
 527         struct serial_state *state;
 528         int             retval;
 529
 530         if (!(info->flags & ASYNC_INITIALIZED)) return;
 531
 532         state = info->state;
 533
 534 #ifdef SIMSERIAL_DEBUG
 535         printk("Shutting down serial port %d (irq %d)....", info->line,
 536                state->irq);
 537 #endif
 538
 539         local_irq_save(flags);
 540         {
 541                 /*
 542                  * First unlink the serial port from the IRQ chain...
 543                  */
 544                 if (info->next_port)
 545                         info->next_port->prev_port = info->prev_port;
 546                 if (info->prev_port)
 547                         info->prev_port->next_port = info->next_port;
 548                 else
 549                         IRQ_ports[state->irq] = info->next_port;
 550
 551                 /*
 552                  * Free the IRQ, if necessary
 553                  */
 554                 if (state->irq && (!IRQ_ports[state->irq] ||
 555                                    !IRQ_ports[state->irq]->next_port)) {
 556                         if (IRQ_ports[state->irq]) {
 557                                 free_irq(state->irq, NULL);
 558                                 retval = request_irq(state->irq, rs_interrupt_single,
 559                                                      IRQ_T(info), "serial", NULL);
 560
 561                                 if (retval)
 562                                         printk(KERN_ERR "serial shutdown: request_irq: error %d"
 563                                                "  Couldn't reacquire IRQ.\n", retval);
 564                         } else
 565                                 free_irq(state->irq, NULL);
 566                 }
 567
 568                 if (info->xmit.buf) {
 569                         free_page((unsigned long) info->xmit.buf);
 570                         info->xmit.buf = 0;
 571                 }
 572
 573                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
 574
 575                 info->flags &= ~ASYNC_INITIALIZED;
 576         }
 577         local_irq_restore(flags);
 578 }
 579
 580 /*
 581  * ------------------------------------------------------------
 582  * rs_close()
 583  *
 584  * This routine is called when the serial port gets closed.  First, we
 585  * wait for the last remaining data to be sent.  Then, we unlink its
 586  * async structure from the interrupt chain if necessary, and we free
 587  * that IRQ if nothing is left in the chain.
 588  * ------------------------------------------------------------
 589  */
 590 static void rs_close(struct tty_struct *tty, struct file * filp)
 591 {
 592         struct async_struct * info = (struct async_struct *)tty->driver_data;
 593         struct serial_state *state;
 594         unsigned long flags;
 595
 596         if (!info ) return;
 597
 598         state = info->state;
 599
 600         local_irq_save(flags);
 601         if (tty_hung_up_p(filp)) {
 602 #ifdef SIMSERIAL_DEBUG
 603                 printk("rs_close: hung_up\n");
 604 #endif
 605                 local_irq_restore(flags);
 606                 return;
 607         }
 608 #ifdef SIMSERIAL_DEBUG
 609         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
 610 #endif
 611         if ((tty->count == 1) && (state->count != 1)) {
 612                 /*
 613                  * Uh, oh.  tty->count is 1, which means that the tty
 614                  * structure will be freed.  state->count should always
 615                  * be one in these conditions.  If it's greater than
 616                  * one, we've got real problems, since it means the
 617                  * serial port won't be shutdown.
 618                  */
 619                 printk(KERN_ERR "rs_close: bad serial port count; tty->count is 1, "
 620                        "state->count is %d\n", state->count);
 621                 state->count = 1;
 622         }
 623         if (--state->count < 0) {
 624                 printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
 625                        info->line, state->count);
 626                 state->count = 0;
 627         }
 628         if (state->count) {
 629                 local_irq_restore(flags);
 630                 return;
 631         }
 632         info->flags |= ASYNC_CLOSING;
 633         local_irq_restore(flags);
 634
 635         /*
 636          * Now we wait for the transmit buffer to clear; and we notify
 637          * the line discipline to only process XON/XOFF characters.
 638          */
 639         shutdown(info);
 640         if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty);
 641         if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty);
 642         info->event = 0;
 643         info->tty = 0;
 644         if (info->blocked_open) {
 645                 if (info->close_delay) {
 646                         current->state = TASK_INTERRUPTIBLE;
 647                         schedule_timeout(info->close_delay);
 648                 }
 649                 wake_up_interruptible(&info->open_wait);
 650         }
 651         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 652         wake_up_interruptible(&info->close_wait);
 653 }
 654
 655 /*
 656  * rs_wait_until_sent() --- wait until the transmitter is empty
 657  */
 658 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
 659 {
 660 }
 661
 662
 663 /*
 664  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
 665  */
 666 static void rs_hangup(struct tty_struct *tty)
 667 {
 668         struct async_struct * info = (struct async_struct *)tty->driver_data;
 669         struct serial_state *state = info->state;
 670
 671 #ifdef SIMSERIAL_DEBUG
 672         printk("rs_hangup: called\n");
 673 #endif
 674
 675         state = info->state;
 676
 677         rs_flush_buffer(tty);
 678         if (info->flags & ASYNC_CLOSING)
 679                 return;
 680         shutdown(info);
 681
 682         info->event = 0;
 683         state->count = 0;
 684         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 685         info->tty = 0;
 686         wake_up_interruptible(&info->open_wait);
 687 }
 688
 689
 690 static int get_async_struct(int line, struct async_struct **ret_info)
 691 {
 692         struct async_struct *info;
 693         struct serial_state *sstate;
 694
 695         sstate = rs_table + line;
 696         sstate->count++;
 697         if (sstate->info) {
 698                 *ret_info = sstate->info;
 699                 return 0;
 700         }
 701         info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
 702         if (!info) {
 703                 sstate->count--;
 704                 return -ENOMEM;
 705         }
 706         memset(info, 0, sizeof(struct async_struct));
 707         init_waitqueue_head(&info->open_wait);
 708         init_waitqueue_head(&info->close_wait);
 709         init_waitqueue_head(&info->delta_msr_wait);
 710         info->magic = SERIAL_MAGIC;
 711         info->port = sstate->port;
 712         info->flags = sstate->flags;
 713         info->xmit_fifo_size = sstate->xmit_fifo_size;
 714         info->line = line;
 715         INIT_WORK(&info->work, do_softint, info);
 716         info->state = sstate;
 717         if (sstate->info) {
 718                 kfree(info);
 719                 *ret_info = sstate->info;
 720                 return 0;
 721         }
 722         *ret_info = sstate->info = info;
 723         return 0;
 724 }
 725
 726 static int
 727 startup(struct async_struct *info)
 728 {
 729         unsigned long flags;
 730         int     retval=0;
 731         irqreturn_t (*handler)(int, void *, struct pt_regs *);
 732         struct serial_state *state= info->state;
 733         unsigned long page;
 734
 735         page = get_zeroed_page(GFP_KERNEL);
 736         if (!page)
 737                 return -ENOMEM;
 738
 739         local_irq_save(flags);
 740
 741         if (info->flags & ASYNC_INITIALIZED) {
 742                 free_page(page);
 743                 goto errout;
 744         }
 745
 746         if (!state->port || !state->type) {
 747                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
 748                 free_page(page);
 749                 goto errout;
 750         }
 751         if (info->xmit.buf)
 752                 free_page(page);
 753         else
 754                 info->xmit.buf = (unsigned char *) page;
 755
 756 #ifdef SIMSERIAL_DEBUG
 757         printk("startup: ttys%d (irq %d)...", info->line, state->irq);
 758 #endif
 759
 760         /*
 761          * Allocate the IRQ if necessary
 762          */
 763         if (state->irq && (!IRQ_ports[state->irq] ||
 764                           !IRQ_ports[state->irq]->next_port)) {
 765                 if (IRQ_ports[state->irq]) {
 766                         retval = -EBUSY;
 767                         goto errout;
 768                 } else
 769                         handler = rs_interrupt_single;
 770
 771                 retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", NULL);
 772                 if (retval) {
 773                         if (capable(CAP_SYS_ADMIN)) {
 774                                 if (info->tty)
 775                                         set_bit(TTY_IO_ERROR,
 776                                                 &info->tty->flags);
 777                                 retval = 0;
 778                         }
 779                         goto errout;
 780                 }
 781         }
 782
 783         /*
 784          * Insert serial port into IRQ chain.
 785          */
 786         info->prev_port = 0;
 787         info->next_port = IRQ_ports[state->irq];
 788         if (info->next_port)
 789                 info->next_port->prev_port = info;
 790         IRQ_ports[state->irq] = info;
 791
 792         if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags);
 793
 794         info->xmit.head = info->xmit.tail = 0;
 795
 796 #if 0
 797         /*
 798          * Set up serial timers...
 799          */
 800         timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
 801         timer_active |= 1 << RS_TIMER;
 802 #endif
 803
 804         /*
 805          * Set up the tty->alt_speed kludge
 806          */
 807         if (info->tty) {
 808                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 809                         info->tty->alt_speed = 57600;
 810                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 811                         info->tty->alt_speed = 115200;
 812                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 813                         info->tty->alt_speed = 230400;
 814                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 815                         info->tty->alt_speed = 460800;
 816         }
 817
 818         info->flags |= ASYNC_INITIALIZED;
 819         local_irq_restore(flags);
 820         return 0;
 821
 822 errout:
 823         local_irq_restore(flags);
 824         return retval;
 825 }
 826
 827
 828 /*
 829  * This routine is called whenever a serial port is opened.  It
 830  * enables interrupts for a serial port, linking in its async structure into
 831  * the IRQ chain.   It also performs the serial-specific
 832  * initialization for the tty structure.
 833  */
 834 static int rs_open(struct tty_struct *tty, struct file * filp)
 835 {
 836         struct async_struct     *info;
 837         int                     retval, line;
 838         unsigned long           page;
 839
 840         line = tty->index;
 841         if ((line < 0) || (line >= NR_PORTS))
 842                 return -ENODEV;
 843         retval = get_async_struct(line, &info);
 844         if (retval)
 845                 return retval;
 846         tty->driver_data = info;
 847         info->tty = tty;
 848
 849 #ifdef SIMSERIAL_DEBUG
 850         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
 851 #endif
 852         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 853
 854         if (!tmp_buf) {
 855                 page = get_zeroed_page(GFP_KERNEL);
 856                 if (!page)
 857                         return -ENOMEM;
 858                 if (tmp_buf)
 859                         free_page(page);
 860                 else
 861                         tmp_buf = (unsigned char *) page;
 862         }
 863
 864         /*
 865          * If the port is the middle of closing, bail out now
 866          */
 867         if (tty_hung_up_p(filp) ||
 868             (info->flags & ASYNC_CLOSING)) {
 869                 if (info->flags & ASYNC_CLOSING)
 870                         interruptible_sleep_on(&info->close_wait);
 871 #ifdef SERIAL_DO_RESTART
 872                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
 873                         -EAGAIN : -ERESTARTSYS);
 874 #else
 875                 return -EAGAIN;
 876 #endif
 877         }
 878
 879         /*
 880          * Start up serial port
 881          */
 882         retval = startup(info);
 883         if (retval) {
 884                 return retval;
 885         }
 886
 887         /*
 888          * figure out which console to use (should be one already)
 889          */
 890         console = console_drivers;
 891         while (console) {
 892                 if ((console->flags & CON_ENABLED) && console->write) break;
 893                 console = console->next;
 894         }
 895
 896 #ifdef SIMSERIAL_DEBUG
 897         printk("rs_open ttys%d successful\n", info->line);
 898 #endif
 899         return 0;
 900 }
 901
 902 /*
 903  * /proc fs routines....
 904  */
 905
 906 static inline int line_info(char *buf, struct serial_state *state)
 907 {
 908         return sprintf(buf, "%d: uart:%s port:%lX irq:%d\n",
 909                        state->line, uart_config[state->type].name,
 910                        state->port, state->irq);
 911 }
 912
 913 static int rs_read_proc(char *page, char **start, off_t off, int count,
 914                  int *eof, void *data)
 915 {
 916         int i, len = 0, l;
 917         off_t   begin = 0;
 918
 919         len += sprintf(page, "simserinfo:1.0 driver:%s\n", serial_version);
 920         for (i = 0; i < NR_PORTS && len < 4000; i++) {
 921                 l = line_info(page + len, &rs_table[i]);
 922                 len += l;
 923                 if (len+begin > off+count)
 924                         goto done;
 925                 if (len+begin < off) {
 926                         begin += len;
 927                         len = 0;
 928                 }
 929         }
 930         *eof = 1;
 931 done:
 932         if (off >= len+begin)
 933                 return 0;
 934         *start = page + (begin-off);
 935         return ((count < begin+len-off) ? count : begin+len-off);
 936 }
 937
 938 /*
 939  * ---------------------------------------------------------------------
 940  * rs_init() and friends
 941  *
 942  * rs_init() is called at boot-time to initialize the serial driver.
 943  * ---------------------------------------------------------------------
 944  */
 945
 946 /*
 947  * This routine prints out the appropriate serial driver version
 948  * number, and identifies which options were configured into this
 949  * driver.
 950  */
 951 static inline void show_serial_version(void)
 952 {
 953         printk(KERN_INFO "%s version %s with", serial_name, serial_version);
 954         printk(KERN_INFO " no serial options enabled\n");
 955 }
 956
 957 static struct tty_operations hp_ops = {
 958         .open = rs_open,
 959         .close = rs_close,
 960         .write = rs_write,
 961         .put_char = rs_put_char,
 962         .flush_chars = rs_flush_chars,
 963         .write_room = rs_write_room,
 964         .chars_in_buffer = rs_chars_in_buffer,
 965         .flush_buffer = rs_flush_buffer,
 966         .ioctl = rs_ioctl,
 967         .throttle = rs_throttle,
 968         .unthrottle = rs_unthrottle,
 969         .send_xchar = rs_send_xchar,
 970         .set_termios = rs_set_termios,
 971         .stop = rs_stop,
 972         .start = rs_start,
 973         .hangup = rs_hangup,
 974         .break_ctl = rs_break,
 975         .wait_until_sent = rs_wait_until_sent,
 976         .read_proc = rs_read_proc,
 977 };
 978
 979 /*
 980  * The serial driver boot-time initialization code!
 981  */
 982 static int __init
 983 simrs_init (void)
 984 {
 985         int                     i, rc;
 986         struct serial_state     *state;
 987
 988         if (!ia64_platform_is("hpsim"))
 989                 return -ENODEV;
 990
 991         hp_simserial_driver = alloc_tty_driver(1);
 992         if (!hp_simserial_driver)
 993                 return -ENOMEM;
 994
 995         show_serial_version();
 996
 997         /* Initialize the tty_driver structure */
 998
 999         hp_simserial_driver->owner = THIS_MODULE;
1000         hp_simserial_driver->driver_name = "simserial";
1001         hp_simserial_driver->name = "ttyS";
1002         hp_simserial_driver->major = TTY_MAJOR;
1003         hp_simserial_driver->minor_start = 64;
1004         hp_simserial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1005         hp_simserial_driver->subtype = SERIAL_TYPE_NORMAL;
1006         hp_simserial_driver->init_termios = tty_std_termios;
1007         hp_simserial_driver->init_termios.c_cflag =
1008                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1009         hp_simserial_driver->flags = TTY_DRIVER_REAL_RAW;
1010         tty_set_operations(hp_simserial_driver, &hp_ops);
1011
1012         /*
1013          * Let's have a little bit of fun !
1014          */
1015         for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
1016
1017                 if (state->type == PORT_UNKNOWN) continue;
1018
1019                 if (!state->irq) {
1020                         if ((rc = assign_irq_vector(AUTO_ASSIGN)) < 0)
1021                                 panic("%s: out of interrupt vectors!\n",
1022                                       __FUNCTION__);
1023                         state->irq = rc;
1024                         ia64_ssc_connect_irq(KEYBOARD_INTR, state->irq);
1025                 }
1026
1027                 printk(KERN_INFO "ttyS%d at 0x%04lx (irq = %d) is a %s\n",
1028                        state->line,
1029                        state->port, state->irq,
1030                        uart_config[state->type].name);
1031         }
1032
1033         if (tty_register_driver(hp_simserial_driver))
1034                 panic("Couldn't register simserial driver\n");
1035
1036         return 0;
1037 }
1038
1039 #ifndef MODULE
1040 __initcall(simrs_init);
1041 #endif