drivers/char/amiserial.c

   1 /*
   2  *  linux/drivers/char/amiserial.c
   3  *
   4  * Serial driver for the amiga builtin port.
   5  *
   6  * This code was created by taking serial.c version 4.30 from kernel
   7  * release 2.3.22, replacing all hardware related stuff with the
   8  * corresponding amiga hardware actions, and removing all irrelevant
   9  * code. As a consequence, it uses many of the constants and names
  10  * associated with the registers and bits of 16550 compatible UARTS -
  11  * but only to keep track of status, etc in the state variables. It
  12  * was done this was to make it easier to keep the code in line with
  13  * (non hardware specific) changes to serial.c.
  14  *
  15  * The port is registered with the tty driver as minor device 64, and
  16  * therefore other ports should should only use 65 upwards.
  17  *
  18  * Richard Lucock 28/12/99
  19  *
  20  *  Copyright (C) 1991, 1992  Linus Torvalds
  21  *  Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
  22  *              1998, 1999  Theodore Ts'o
  23  *
  24  */
  25
  26 /*
  27  * Serial driver configuration section.  Here are the various options:
  28  *
  29  * SERIAL_PARANOIA_CHECK
  30  *              Check the magic number for the async_structure where
  31  *              ever possible.
  32  */
  33
  34 #include <linux/delay.h>
  35
  36 #undef SERIAL_PARANOIA_CHECK
  37 #define SERIAL_DO_RESTART
  38
  39 /* Set of debugging defines */
  40
  41 #undef SERIAL_DEBUG_INTR
  42 #undef SERIAL_DEBUG_OPEN
  43 #undef SERIAL_DEBUG_FLOW
  44 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
  45
  46 /* Sanity checks */
  47
  48 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
  49 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
  50  tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
  51 #else
  52 #define DBG_CNT(s)
  53 #endif
  54
  55 /*
  56  * End of serial driver configuration section.
  57  */
  58
  59 #include <linux/module.h>
  60
  61 #include <linux/types.h>
  62 #include <linux/serial.h>
  63 #include <linux/serialP.h>
  64 #include <linux/serial_reg.h>
  65 static char *serial_version = "4.30";
  66
  67 #include <linux/errno.h>
  68 #include <linux/signal.h>
  69 #include <linux/sched.h>
  70 #include <linux/kernel.h>
  71 #include <linux/timer.h>
  72 #include <linux/interrupt.h>
  73 #include <linux/tty.h>
  74 #include <linux/tty_flip.h>
  75 #include <linux/console.h>
  76 #include <linux/major.h>
  77 #include <linux/string.h>
  78 #include <linux/fcntl.h>
  79 #include <linux/ptrace.h>
  80 #include <linux/ioport.h>
  81 #include <linux/mm.h>
  82 #include <linux/seq_file.h>
  83 #include <linux/slab.h>
  84 #include <linux/smp_lock.h>
  85 #include <linux/init.h>
  86 #include <linux/bitops.h>
  87 #include <linux/platform_device.h>
  88
  89 #include <asm/setup.h>
  90
  91 #include <asm/system.h>
  92
  93 #include <asm/irq.h>
  94
  95 #include <asm/amigahw.h>
  96 #include <asm/amigaints.h>
  97
  98 #define custom amiga_custom
  99 static char *serial_name = "Amiga-builtin serial driver";
 100
 101 static struct tty_driver *serial_driver;
 102
 103 /* number of characters left in xmit buffer before we ask for more */
 104 #define WAKEUP_CHARS 256
 105
 106 static struct async_struct *IRQ_ports;
 107
 108 static unsigned char current_ctl_bits;
 109
 110 static void change_speed(struct async_struct *info, struct ktermios *old);
 111 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
 112
 113
 114 static struct serial_state rs_table[1];
 115
 116 #define NR_PORTS ARRAY_SIZE(rs_table)
 117
 118 #include <asm/uaccess.h>
 119
 120 #define serial_isroot() (capable(CAP_SYS_ADMIN))
 121
 122
 123 static inline int serial_paranoia_check(struct async_struct *info,
 124                                         char *name, const char *routine)
 125 {
 126 #ifdef SERIAL_PARANOIA_CHECK
 127         static const char *badmagic =
 128                 "Warning: bad magic number for serial struct (%s) in %s\n";
 129         static const char *badinfo =
 130                 "Warning: null async_struct for (%s) in %s\n";
 131
 132         if (!info) {
 133                 printk(badinfo, name, routine);
 134                 return 1;
 135         }
 136         if (info->magic != SERIAL_MAGIC) {
 137                 printk(badmagic, name, routine);
 138                 return 1;
 139         }
 140 #endif
 141         return 0;
 142 }
 143
 144 /* some serial hardware definitions */
 145 #define SDR_OVRUN   (1<<15)
 146 #define SDR_RBF     (1<<14)
 147 #define SDR_TBE     (1<<13)
 148 #define SDR_TSRE    (1<<12)
 149
 150 #define SERPER_PARENB    (1<<15)
 151
 152 #define AC_SETCLR   (1<<15)
 153 #define AC_UARTBRK  (1<<11)
 154
 155 #define SER_DTR     (1<<7)
 156 #define SER_RTS     (1<<6)
 157 #define SER_DCD     (1<<5)
 158 #define SER_CTS     (1<<4)
 159 #define SER_DSR     (1<<3)
 160
 161 static __inline__ void rtsdtr_ctrl(int bits)
 162 {
 163     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
 164 }
 165
 166 /*
 167  * ------------------------------------------------------------
 168  * rs_stop() and rs_start()
 169  *
 170  * This routines are called before setting or resetting tty->stopped.
 171  * They enable or disable transmitter interrupts, as necessary.
 172  * ------------------------------------------------------------
 173  */
 174 static void rs_stop(struct tty_struct *tty)
 175 {
 176         struct async_struct *info = tty->driver_data;
 177         unsigned long flags;
 178
 179         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 180                 return;
 181
 182         local_irq_save(flags);
 183         if (info->IER & UART_IER_THRI) {
 184                 info->IER &= ~UART_IER_THRI;
 185                 /* disable Tx interrupt and remove any pending interrupts */
 186                 custom.intena = IF_TBE;
 187                 mb();
 188                 custom.intreq = IF_TBE;
 189                 mb();
 190         }
 191         local_irq_restore(flags);
 192 }
 193
 194 static void rs_start(struct tty_struct *tty)
 195 {
 196         struct async_struct *info = tty->driver_data;
 197         unsigned long flags;
 198
 199         if (serial_paranoia_check(info, tty->name, "rs_start"))
 200                 return;
 201
 202         local_irq_save(flags);
 203         if (info->xmit.head != info->xmit.tail
 204             && info->xmit.buf
 205             && !(info->IER & UART_IER_THRI)) {
 206                 info->IER |= UART_IER_THRI;
 207                 custom.intena = IF_SETCLR | IF_TBE;
 208                 mb();
 209                 /* set a pending Tx Interrupt, transmitter should restart now */
 210                 custom.intreq = IF_SETCLR | IF_TBE;
 211                 mb();
 212         }
 213         local_irq_restore(flags);
 214 }
 215
 216 /*
 217  * ----------------------------------------------------------------------
 218  *
 219  * Here starts the interrupt handling routines.  All of the following
 220  * subroutines are declared as inline and are folded into
 221  * rs_interrupt().  They were separated out for readability's sake.
 222  *
 223  * Note: rs_interrupt() is a "fast" interrupt, which means that it
 224  * runs with interrupts turned off.  People who may want to modify
 225  * rs_interrupt() should try to keep the interrupt handler as fast as
 226  * possible.  After you are done making modifications, it is not a bad
 227  * idea to do:
 228  *
 229  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 230  *
 231  * and look at the resulting assemble code in serial.s.
 232  *
 233  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
 234  * -----------------------------------------------------------------------
 235  */
 236
 237 /*
 238  * This routine is used by the interrupt handler to schedule
 239  * processing in the software interrupt portion of the driver.
 240  */
 241 static void rs_sched_event(struct async_struct *info,
 242                            int event)
 243 {
 244         info->event |= 1 << event;
 245         tasklet_schedule(&info->tlet);
 246 }
 247
 248 static void receive_chars(struct async_struct *info)
 249 {
 250         int status;
 251         int serdatr;
 252         struct tty_struct *tty = info->tty;
 253         unsigned char ch, flag;
 254         struct  async_icount *icount;
 255         int oe = 0;
 256
 257         icount = &info->state->icount;
 258
 259         status = UART_LSR_DR; /* We obviously have a character! */
 260         serdatr = custom.serdatr;
 261         mb();
 262         custom.intreq = IF_RBF;
 263         mb();
 264
 265         if((serdatr & 0x1ff) == 0)
 266             status |= UART_LSR_BI;
 267         if(serdatr & SDR_OVRUN)
 268             status |= UART_LSR_OE;
 269
 270         ch = serdatr & 0xff;
 271         icount->rx++;
 272
 273 #ifdef SERIAL_DEBUG_INTR
 274         printk("DR%02x:%02x...", ch, status);
 275 #endif
 276         flag = TTY_NORMAL;
 277
 278         /*
 279          * We don't handle parity or frame errors - but I have left
 280          * the code in, since I'm not sure that the errors can't be
 281          * detected.
 282          */
 283
 284         if (status & (UART_LSR_BI | UART_LSR_PE |
 285                       UART_LSR_FE | UART_LSR_OE)) {
 286           /*
 287            * For statistics only
 288            */
 289           if (status & UART_LSR_BI) {
 290             status &= ~(UART_LSR_FE | UART_LSR_PE);
 291             icount->brk++;
 292           } else if (status & UART_LSR_PE)
 293             icount->parity++;
 294           else if (status & UART_LSR_FE)
 295             icount->frame++;
 296           if (status & UART_LSR_OE)
 297             icount->overrun++;
 298
 299           /*
 300            * Now check to see if character should be
 301            * ignored, and mask off conditions which
 302            * should be ignored.
 303            */
 304           if (status & info->ignore_status_mask)
 305             goto out;
 306
 307           status &= info->read_status_mask;
 308
 309           if (status & (UART_LSR_BI)) {
 310 #ifdef SERIAL_DEBUG_INTR
 311             printk("handling break....");
 312 #endif
 313             flag = TTY_BREAK;
 314             if (info->flags & ASYNC_SAK)
 315               do_SAK(tty);
 316           } else if (status & UART_LSR_PE)
 317             flag = TTY_PARITY;
 318           else if (status & UART_LSR_FE)
 319             flag = TTY_FRAME;
 320           if (status & UART_LSR_OE) {
 321             /*
 322              * Overrun is special, since it's
 323              * reported immediately, and doesn't
 324              * affect the current character
 325              */
 326              oe = 1;
 327           }
 328         }
 329         tty_insert_flip_char(tty, ch, flag);
 330         if (oe == 1)
 331                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 332         tty_flip_buffer_push(tty);
 333 out:
 334         return;
 335 }
 336
 337 static void transmit_chars(struct async_struct *info)
 338 {
 339         custom.intreq = IF_TBE;
 340         mb();
 341         if (info->x_char) {
 342                 custom.serdat = info->x_char | 0x100;
 343                 mb();
 344                 info->state->icount.tx++;
 345                 info->x_char = 0;
 346                 return;
 347         }
 348         if (info->xmit.head == info->xmit.tail
 349             || info->tty->stopped
 350             || info->tty->hw_stopped) {
 351                 info->IER &= ~UART_IER_THRI;
 352                 custom.intena = IF_TBE;
 353                 mb();
 354                 return;
 355         }
 356
 357         custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
 358         mb();
 359         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
 360         info->state->icount.tx++;
 361
 362         if (CIRC_CNT(info->xmit.head,
 363                      info->xmit.tail,
 364                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
 365                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
 366
 367 #ifdef SERIAL_DEBUG_INTR
 368         printk("THRE...");
 369 #endif
 370         if (info->xmit.head == info->xmit.tail) {
 371                 custom.intena = IF_TBE;
 372                 mb();
 373                 info->IER &= ~UART_IER_THRI;
 374         }
 375 }
 376
 377 static void check_modem_status(struct async_struct *info)
 378 {
 379         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 380         unsigned char dstatus;
 381         struct  async_icount *icount;
 382
 383         /* Determine bits that have changed */
 384         dstatus = status ^ current_ctl_bits;
 385         current_ctl_bits = status;
 386
 387         if (dstatus) {
 388                 icount = &info->state->icount;
 389                 /* update input line counters */
 390                 if (dstatus & SER_DSR)
 391                         icount->dsr++;
 392                 if (dstatus & SER_DCD) {
 393                         icount->dcd++;
 394 #ifdef CONFIG_HARD_PPS
 395                         if ((info->flags & ASYNC_HARDPPS_CD) &&
 396                             !(status & SER_DCD))
 397                                 hardpps();
 398 #endif
 399                 }
 400                 if (dstatus & SER_CTS)
 401                         icount->cts++;
 402                 wake_up_interruptible(&info->delta_msr_wait);
 403         }
 404
 405         if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
 406 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
 407                 printk("ttyS%d CD now %s...", info->line,
 408                        (!(status & SER_DCD)) ? "on" : "off");
 409 #endif
 410                 if (!(status & SER_DCD))
 411                         wake_up_interruptible(&info->open_wait);
 412                 else {
 413 #ifdef SERIAL_DEBUG_OPEN
 414                         printk("doing serial hangup...");
 415 #endif
 416                         if (info->tty)
 417                                 tty_hangup(info->tty);
 418                 }
 419         }
 420         if (info->flags & ASYNC_CTS_FLOW) {
 421                 if (info->tty->hw_stopped) {
 422                         if (!(status & SER_CTS)) {
 423 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 424                                 printk("CTS tx start...");
 425 #endif
 426                                 info->tty->hw_stopped = 0;
 427                                 info->IER |= UART_IER_THRI;
 428                                 custom.intena = IF_SETCLR | IF_TBE;
 429                                 mb();
 430                                 /* set a pending Tx Interrupt, transmitter should restart now */
 431                                 custom.intreq = IF_SETCLR | IF_TBE;
 432                                 mb();
 433                                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
 434                                 return;
 435                         }
 436                 } else {
 437                         if ((status & SER_CTS)) {
 438 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 439                                 printk("CTS tx stop...");
 440 #endif
 441                                 info->tty->hw_stopped = 1;
 442                                 info->IER &= ~UART_IER_THRI;
 443                                 /* disable Tx interrupt and remove any pending interrupts */
 444                                 custom.intena = IF_TBE;
 445                                 mb();
 446                                 custom.intreq = IF_TBE;
 447                                 mb();
 448                         }
 449                 }
 450         }
 451 }
 452
 453 static irqreturn_t ser_vbl_int( int irq, void *data)
 454 {
 455         /* vbl is just a periodic interrupt we tie into to update modem status */
 456         struct async_struct * info = IRQ_ports;
 457         /*
 458          * TBD - is it better to unregister from this interrupt or to
 459          * ignore it if MSI is clear ?
 460          */
 461         if(info->IER & UART_IER_MSI)
 462           check_modem_status(info);
 463         return IRQ_HANDLED;
 464 }
 465
 466 static irqreturn_t ser_rx_int(int irq, void *dev_id)
 467 {
 468         struct async_struct * info;
 469
 470 #ifdef SERIAL_DEBUG_INTR
 471         printk("ser_rx_int...");
 472 #endif
 473
 474         info = IRQ_ports;
 475         if (!info || !info->tty)
 476                 return IRQ_NONE;
 477
 478         receive_chars(info);
 479         info->last_active = jiffies;
 480 #ifdef SERIAL_DEBUG_INTR
 481         printk("end.\n");
 482 #endif
 483         return IRQ_HANDLED;
 484 }
 485
 486 static irqreturn_t ser_tx_int(int irq, void *dev_id)
 487 {
 488         struct async_struct * info;
 489
 490         if (custom.serdatr & SDR_TBE) {
 491 #ifdef SERIAL_DEBUG_INTR
 492           printk("ser_tx_int...");
 493 #endif
 494
 495           info = IRQ_ports;
 496           if (!info || !info->tty)
 497                 return IRQ_NONE;
 498
 499           transmit_chars(info);
 500           info->last_active = jiffies;
 501 #ifdef SERIAL_DEBUG_INTR
 502           printk("end.\n");
 503 #endif
 504         }
 505         return IRQ_HANDLED;
 506 }
 507
 508 /*
 509  * -------------------------------------------------------------------
 510  * Here ends the serial interrupt routines.
 511  * -------------------------------------------------------------------
 512  */
 513
 514 /*
 515  * This routine is used to handle the "bottom half" processing for the
 516  * serial driver, known also the "software interrupt" processing.
 517  * This processing is done at the kernel interrupt level, after the
 518  * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
 519  * is where time-consuming activities which can not be done in the
 520  * interrupt driver proper are done; the interrupt driver schedules
 521  * them using rs_sched_event(), and they get done here.
 522  */
 523
 524 static void do_softint(unsigned long private_)
 525 {
 526         struct async_struct     *info = (struct async_struct *) private_;
 527         struct tty_struct       *tty;
 528
 529         tty = info->tty;
 530         if (!tty)
 531                 return;
 532
 533         if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
 534                 tty_wakeup(tty);
 535 }
 536
 537 /*
 538  * ---------------------------------------------------------------
 539  * Low level utility subroutines for the serial driver:  routines to
 540  * figure out the appropriate timeout for an interrupt chain, routines
 541  * to initialize and startup a serial port, and routines to shutdown a
 542  * serial port.  Useful stuff like that.
 543  * ---------------------------------------------------------------
 544  */
 545
 546 static int startup(struct async_struct * info)
 547 {
 548         unsigned long flags;
 549         int     retval=0;
 550         unsigned long page;
 551
 552         page = get_zeroed_page(GFP_KERNEL);
 553         if (!page)
 554                 return -ENOMEM;
 555
 556         local_irq_save(flags);
 557
 558         if (info->flags & ASYNC_INITIALIZED) {
 559                 free_page(page);
 560                 goto errout;
 561         }
 562
 563         if (info->xmit.buf)
 564                 free_page(page);
 565         else
 566                 info->xmit.buf = (unsigned char *) page;
 567
 568 #ifdef SERIAL_DEBUG_OPEN
 569         printk("starting up ttys%d ...", info->line);
 570 #endif
 571
 572         /* Clear anything in the input buffer */
 573
 574         custom.intreq = IF_RBF;
 575         mb();
 576
 577         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
 578         if (retval) {
 579           if (serial_isroot()) {
 580             if (info->tty)
 581               set_bit(TTY_IO_ERROR,
 582                       &info->tty->flags);
 583             retval = 0;
 584           }
 585           goto errout;
 586         }
 587
 588         /* enable both Rx and Tx interrupts */
 589         custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
 590         mb();
 591         info->IER = UART_IER_MSI;
 592
 593         /* remember current state of the DCD and CTS bits */
 594         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 595
 596         IRQ_ports = info;
 597
 598         info->MCR = 0;
 599         if (info->tty->termios->c_cflag & CBAUD)
 600           info->MCR = SER_DTR | SER_RTS;
 601         rtsdtr_ctrl(info->MCR);
 602
 603         if (info->tty)
 604                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
 605         info->xmit.head = info->xmit.tail = 0;
 606
 607         /*
 608          * Set up the tty->alt_speed kludge
 609          */
 610         if (info->tty) {
 611                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 612                         info->tty->alt_speed = 57600;
 613                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 614                         info->tty->alt_speed = 115200;
 615                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 616                         info->tty->alt_speed = 230400;
 617                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 618                         info->tty->alt_speed = 460800;
 619         }
 620
 621         /*
 622          * and set the speed of the serial port
 623          */
 624         change_speed(info, NULL);
 625
 626         info->flags |= ASYNC_INITIALIZED;
 627         local_irq_restore(flags);
 628         return 0;
 629
 630 errout:
 631         local_irq_restore(flags);
 632         return retval;
 633 }
 634
 635 /*
 636  * This routine will shutdown a serial port; interrupts are disabled, and
 637  * DTR is dropped if the hangup on close termio flag is on.
 638  */
 639 static void shutdown(struct async_struct * info)
 640 {
 641         unsigned long   flags;
 642         struct serial_state *state;
 643
 644         if (!(info->flags & ASYNC_INITIALIZED))
 645                 return;
 646
 647         state = info->state;
 648
 649 #ifdef SERIAL_DEBUG_OPEN
 650         printk("Shutting down serial port %d ....\n", info->line);
 651 #endif
 652
 653         local_irq_save(flags); /* Disable interrupts */
 654
 655         /*
 656          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 657          * here so the queue might never be waken up
 658          */
 659         wake_up_interruptible(&info->delta_msr_wait);
 660
 661         IRQ_ports = NULL;
 662
 663         /*
 664          * Free the IRQ, if necessary
 665          */
 666         free_irq(IRQ_AMIGA_VERTB, info);
 667
 668         if (info->xmit.buf) {
 669                 free_page((unsigned long) info->xmit.buf);
 670                 info->xmit.buf = NULL;
 671         }
 672
 673         info->IER = 0;
 674         custom.intena = IF_RBF | IF_TBE;
 675         mb();
 676
 677         /* disable break condition */
 678         custom.adkcon = AC_UARTBRK;
 679         mb();
 680
 681         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
 682                 info->MCR &= ~(SER_DTR|SER_RTS);
 683         rtsdtr_ctrl(info->MCR);
 684
 685         if (info->tty)
 686                 set_bit(TTY_IO_ERROR, &info->tty->flags);
 687
 688         info->flags &= ~ASYNC_INITIALIZED;
 689         local_irq_restore(flags);
 690 }
 691
 692
 693 /*
 694  * This routine is called to set the UART divisor registers to match
 695  * the specified baud rate for a serial port.
 696  */
 697 static void change_speed(struct async_struct *info,
 698                          struct ktermios *old_termios)
 699 {
 700         int     quot = 0, baud_base, baud;
 701         unsigned cflag, cval = 0;
 702         int     bits;
 703         unsigned long   flags;
 704
 705         if (!info->tty || !info->tty->termios)
 706                 return;
 707         cflag = info->tty->termios->c_cflag;
 708
 709         /* Byte size is always 8 bits plus parity bit if requested */
 710
 711         cval = 3; bits = 10;
 712         if (cflag & CSTOPB) {
 713                 cval |= 0x04;
 714                 bits++;
 715         }
 716         if (cflag & PARENB) {
 717                 cval |= UART_LCR_PARITY;
 718                 bits++;
 719         }
 720         if (!(cflag & PARODD))
 721                 cval |= UART_LCR_EPAR;
 722 #ifdef CMSPAR
 723         if (cflag & CMSPAR)
 724                 cval |= UART_LCR_SPAR;
 725 #endif
 726
 727         /* Determine divisor based on baud rate */
 728         baud = tty_get_baud_rate(info->tty);
 729         if (!baud)
 730                 baud = 9600;    /* B0 transition handled in rs_set_termios */
 731         baud_base = info->state->baud_base;
 732         if (baud == 38400 &&
 733             ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
 734                 quot = info->state->custom_divisor;
 735         else {
 736                 if (baud == 134)
 737                         /* Special case since 134 is really 134.5 */
 738                         quot = (2*baud_base / 269);
 739                 else if (baud)
 740                         quot = baud_base / baud;
 741         }
 742         /* If the quotient is zero refuse the change */
 743         if (!quot && old_termios) {
 744                 /* FIXME: Will need updating for new tty in the end */
 745                 info->tty->termios->c_cflag &= ~CBAUD;
 746                 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
 747                 baud = tty_get_baud_rate(info->tty);
 748                 if (!baud)
 749                         baud = 9600;
 750                 if (baud == 38400 &&
 751                     ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
 752                         quot = info->state->custom_divisor;
 753                 else {
 754                         if (baud == 134)
 755                                 /* Special case since 134 is really 134.5 */
 756                                 quot = (2*baud_base / 269);
 757                         else if (baud)
 758                                 quot = baud_base / baud;
 759                 }
 760         }
 761         /* As a last resort, if the quotient is zero, default to 9600 bps */
 762         if (!quot)
 763                 quot = baud_base / 9600;
 764         info->quot = quot;
 765         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
 766         info->timeout += HZ/50;         /* Add .02 seconds of slop */
 767
 768         /* CTS flow control flag and modem status interrupts */
 769         info->IER &= ~UART_IER_MSI;
 770         if (info->flags & ASYNC_HARDPPS_CD)
 771                 info->IER |= UART_IER_MSI;
 772         if (cflag & CRTSCTS) {
 773                 info->flags |= ASYNC_CTS_FLOW;
 774                 info->IER |= UART_IER_MSI;
 775         } else
 776                 info->flags &= ~ASYNC_CTS_FLOW;
 777         if (cflag & CLOCAL)
 778                 info->flags &= ~ASYNC_CHECK_CD;
 779         else {
 780                 info->flags |= ASYNC_CHECK_CD;
 781                 info->IER |= UART_IER_MSI;
 782         }
 783         /* TBD:
 784          * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
 785          */
 786
 787         /*
 788          * Set up parity check flag
 789          */
 790
 791         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
 792         if (I_INPCK(info->tty))
 793                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 794         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
 795                 info->read_status_mask |= UART_LSR_BI;
 796
 797         /*
 798          * Characters to ignore
 799          */
 800         info->ignore_status_mask = 0;
 801         if (I_IGNPAR(info->tty))
 802                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 803         if (I_IGNBRK(info->tty)) {
 804                 info->ignore_status_mask |= UART_LSR_BI;
 805                 /*
 806                  * If we're ignore parity and break indicators, ignore
 807                  * overruns too.  (For real raw support).
 808                  */
 809                 if (I_IGNPAR(info->tty))
 810                         info->ignore_status_mask |= UART_LSR_OE;
 811         }
 812         /*
 813          * !!! ignore all characters if CREAD is not set
 814          */
 815         if ((cflag & CREAD) == 0)
 816                 info->ignore_status_mask |= UART_LSR_DR;
 817         local_irq_save(flags);
 818
 819         {
 820           short serper;
 821
 822         /* Set up the baud rate */
 823           serper = quot - 1;
 824
 825         /* Enable or disable parity bit */
 826
 827         if(cval & UART_LCR_PARITY)
 828           serper |= (SERPER_PARENB);
 829
 830         custom.serper = serper;
 831         mb();
 832         }
 833
 834         info->LCR = cval;                               /* Save LCR */
 835         local_irq_restore(flags);
 836 }
 837
 838 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 839 {
 840         struct async_struct *info;
 841         unsigned long flags;
 842
 843         info = tty->driver_data;
 844
 845         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
 846                 return 0;
 847
 848         if (!info->xmit.buf)
 849                 return 0;
 850
 851         local_irq_save(flags);
 852         if (CIRC_SPACE(info->xmit.head,
 853                        info->xmit.tail,
 854                        SERIAL_XMIT_SIZE) == 0) {
 855                 local_irq_restore(flags);
 856                 return 0;
 857         }
 858
 859         info->xmit.buf[info->xmit.head++] = ch;
 860         info->xmit.head &= SERIAL_XMIT_SIZE-1;
 861         local_irq_restore(flags);
 862         return 1;
 863 }
 864
 865 static void rs_flush_chars(struct tty_struct *tty)
 866 {
 867         struct async_struct *info = tty->driver_data;
 868         unsigned long flags;
 869
 870         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 871                 return;
 872
 873         if (info->xmit.head == info->xmit.tail
 874             || tty->stopped
 875             || tty->hw_stopped
 876             || !info->xmit.buf)
 877                 return;
 878
 879         local_irq_save(flags);
 880         info->IER |= UART_IER_THRI;
 881         custom.intena = IF_SETCLR | IF_TBE;
 882         mb();
 883         /* set a pending Tx Interrupt, transmitter should restart now */
 884         custom.intreq = IF_SETCLR | IF_TBE;
 885         mb();
 886         local_irq_restore(flags);
 887 }
 888
 889 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
 890 {
 891         int     c, ret = 0;
 892         struct async_struct *info;
 893         unsigned long flags;
 894
 895         info = tty->driver_data;
 896
 897         if (serial_paranoia_check(info, tty->name, "rs_write"))
 898                 return 0;
 899
 900         if (!info->xmit.buf)
 901                 return 0;
 902
 903         local_irq_save(flags);
 904         while (1) {
 905                 c = CIRC_SPACE_TO_END(info->xmit.head,
 906                                       info->xmit.tail,
 907                                       SERIAL_XMIT_SIZE);
 908                 if (count < c)
 909                         c = count;
 910                 if (c <= 0) {
 911                         break;
 912                 }
 913                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 914                 info->xmit.head = ((info->xmit.head + c) &
 915                                    (SERIAL_XMIT_SIZE-1));
 916                 buf += c;
 917                 count -= c;
 918                 ret += c;
 919         }
 920         local_irq_restore(flags);
 921
 922         if (info->xmit.head != info->xmit.tail
 923             && !tty->stopped
 924             && !tty->hw_stopped
 925             && !(info->IER & UART_IER_THRI)) {
 926                 info->IER |= UART_IER_THRI;
 927                 local_irq_disable();
 928                 custom.intena = IF_SETCLR | IF_TBE;
 929                 mb();
 930                 /* set a pending Tx Interrupt, transmitter should restart now */
 931                 custom.intreq = IF_SETCLR | IF_TBE;
 932                 mb();
 933                 local_irq_restore(flags);
 934         }
 935         return ret;
 936 }
 937
 938 static int rs_write_room(struct tty_struct *tty)
 939 {
 940         struct async_struct *info = tty->driver_data;
 941
 942         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 943                 return 0;
 944         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 945 }
 946
 947 static int rs_chars_in_buffer(struct tty_struct *tty)
 948 {
 949         struct async_struct *info = tty->driver_data;
 950
 951         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 952                 return 0;
 953         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 954 }
 955
 956 static void rs_flush_buffer(struct tty_struct *tty)
 957 {
 958         struct async_struct *info = tty->driver_data;
 959         unsigned long flags;
 960
 961         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 962                 return;
 963         local_irq_save(flags);
 964         info->xmit.head = info->xmit.tail = 0;
 965         local_irq_restore(flags);
 966         tty_wakeup(tty);
 967 }
 968
 969 /*
 970  * This function is used to send a high-priority XON/XOFF character to
 971  * the device
 972  */
 973 static void rs_send_xchar(struct tty_struct *tty, char ch)
 974 {
 975         struct async_struct *info = tty->driver_data;
 976         unsigned long flags;
 977
 978         if (serial_paranoia_check(info, tty->name, "rs_send_char"))
 979                 return;
 980
 981         info->x_char = ch;
 982         if (ch) {
 983                 /* Make sure transmit interrupts are on */
 984
 985                 /* Check this ! */
 986                 local_irq_save(flags);
 987                 if(!(custom.intenar & IF_TBE)) {
 988                     custom.intena = IF_SETCLR | IF_TBE;
 989                     mb();
 990                     /* set a pending Tx Interrupt, transmitter should restart now */
 991                     custom.intreq = IF_SETCLR | IF_TBE;
 992                     mb();
 993                 }
 994                 local_irq_restore(flags);
 995
 996                 info->IER |= UART_IER_THRI;
 997         }
 998 }
 999
1000 /*
1001  * ------------------------------------------------------------
1002  * rs_throttle()
1003  *
1004  * This routine is called by the upper-layer tty layer to signal that
1005  * incoming characters should be throttled.
1006  * ------------------------------------------------------------
1007  */
1008 static void rs_throttle(struct tty_struct * tty)
1009 {
1010         struct async_struct *info = tty->driver_data;
1011         unsigned long flags;
1012 #ifdef SERIAL_DEBUG_THROTTLE
1013         char    buf[64];
1014
1015         printk("throttle %s: %d....\n", tty_name(tty, buf),
1016                tty->ldisc.chars_in_buffer(tty));
1017 #endif
1018
1019         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1020                 return;
1021
1022         if (I_IXOFF(tty))
1023                 rs_send_xchar(tty, STOP_CHAR(tty));
1024
1025         if (tty->termios->c_cflag & CRTSCTS)
1026                 info->MCR &= ~SER_RTS;
1027
1028         local_irq_save(flags);
1029         rtsdtr_ctrl(info->MCR);
1030         local_irq_restore(flags);
1031 }
1032
1033 static void rs_unthrottle(struct tty_struct * tty)
1034 {
1035         struct async_struct *info = tty->driver_data;
1036         unsigned long flags;
1037 #ifdef SERIAL_DEBUG_THROTTLE
1038         char    buf[64];
1039
1040         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1041                tty->ldisc.chars_in_buffer(tty));
1042 #endif
1043
1044         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1045                 return;
1046
1047         if (I_IXOFF(tty)) {
1048                 if (info->x_char)
1049                         info->x_char = 0;
1050                 else
1051                         rs_send_xchar(tty, START_CHAR(tty));
1052         }
1053         if (tty->termios->c_cflag & CRTSCTS)
1054                 info->MCR |= SER_RTS;
1055         local_irq_save(flags);
1056         rtsdtr_ctrl(info->MCR);
1057         local_irq_restore(flags);
1058 }
1059
1060 /*
1061  * ------------------------------------------------------------
1062  * rs_ioctl() and friends
1063  * ------------------------------------------------------------
1064  */
1065
1066 static int get_serial_info(struct async_struct * info,
1067                            struct serial_struct __user * retinfo)
1068 {
1069         struct serial_struct tmp;
1070         struct serial_state *state = info->state;
1071
1072         if (!retinfo)
1073                 return -EFAULT;
1074         memset(&tmp, 0, sizeof(tmp));
1075         tty_lock();
1076         tmp.type = state->type;
1077         tmp.line = state->line;
1078         tmp.port = state->port;
1079         tmp.irq = state->irq;
1080         tmp.flags = state->flags;
1081         tmp.xmit_fifo_size = state->xmit_fifo_size;
1082         tmp.baud_base = state->baud_base;
1083         tmp.close_delay = state->close_delay;
1084         tmp.closing_wait = state->closing_wait;
1085         tmp.custom_divisor = state->custom_divisor;
1086         tty_unlock();
1087         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1088                 return -EFAULT;
1089         return 0;
1090 }
1091
1092 static int set_serial_info(struct async_struct * info,
1093                            struct serial_struct __user * new_info)
1094 {
1095         struct serial_struct new_serial;
1096         struct serial_state old_state, *state;
1097         unsigned int            change_irq,change_port;
1098         int                     retval = 0;
1099
1100         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1101                 return -EFAULT;
1102
1103         tty_lock();
1104         state = info->state;
1105         old_state = *state;
1106
1107         change_irq = new_serial.irq != state->irq;
1108         change_port = (new_serial.port != state->port);
1109         if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1110           tty_unlock();
1111           return -EINVAL;
1112         }
1113
1114         if (!serial_isroot()) {
1115                 if ((new_serial.baud_base != state->baud_base) ||
1116                     (new_serial.close_delay != state->close_delay) ||
1117                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1118                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1119                      (state->flags & ~ASYNC_USR_MASK)))
1120                         return -EPERM;
1121                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1122                                (new_serial.flags & ASYNC_USR_MASK));
1123                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1124                                (new_serial.flags & ASYNC_USR_MASK));
1125                 state->custom_divisor = new_serial.custom_divisor;
1126                 goto check_and_exit;
1127         }
1128
1129         if (new_serial.baud_base < 9600) {
1130                 tty_unlock();
1131                 return -EINVAL;
1132         }
1133
1134         /*
1135          * OK, past this point, all the error checking has been done.
1136          * At this point, we start making changes.....
1137          */
1138
1139         state->baud_base = new_serial.baud_base;
1140         state->flags = ((state->flags & ~ASYNC_FLAGS) |
1141                         (new_serial.flags & ASYNC_FLAGS));
1142         info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1143                        (info->flags & ASYNC_INTERNAL_FLAGS));
1144         state->custom_divisor = new_serial.custom_divisor;
1145         state->close_delay = new_serial.close_delay * HZ/100;
1146         state->closing_wait = new_serial.closing_wait * HZ/100;
1147         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1148
1149 check_and_exit:
1150         if (info->flags & ASYNC_INITIALIZED) {
1151                 if (((old_state.flags & ASYNC_SPD_MASK) !=
1152                      (state->flags & ASYNC_SPD_MASK)) ||
1153                     (old_state.custom_divisor != state->custom_divisor)) {
1154                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1155                                 info->tty->alt_speed = 57600;
1156                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1157                                 info->tty->alt_speed = 115200;
1158                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1159                                 info->tty->alt_speed = 230400;
1160                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1161                                 info->tty->alt_speed = 460800;
1162                         change_speed(info, NULL);
1163                 }
1164         } else
1165                 retval = startup(info);
1166         tty_unlock();
1167         return retval;
1168 }
1169
1170
1171 /*
1172  * get_lsr_info - get line status register info
1173  *
1174  * Purpose: Let user call ioctl() to get info when the UART physically
1175  *          is emptied.  On bus types like RS485, the transmitter must
1176  *          release the bus after transmitting. This must be done when
1177  *          the transmit shift register is empty, not be done when the
1178  *          transmit holding register is empty.  This functionality
1179  *          allows an RS485 driver to be written in user space.
1180  */
1181 static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1182 {
1183         unsigned char status;
1184         unsigned int result;
1185         unsigned long flags;
1186
1187         local_irq_save(flags);
1188         status = custom.serdatr;
1189         mb();
1190         local_irq_restore(flags);
1191         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1192         if (copy_to_user(value, &result, sizeof(int)))
1193                 return -EFAULT;
1194         return 0;
1195 }
1196
1197
1198 static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1199 {
1200         struct async_struct * info = tty->driver_data;
1201         unsigned char control, status;
1202         unsigned long flags;
1203
1204         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1205                 return -ENODEV;
1206         if (tty->flags & (1 << TTY_IO_ERROR))
1207                 return -EIO;
1208
1209         control = info->MCR;
1210         local_irq_save(flags);
1211         status = ciab.pra;
1212         local_irq_restore(flags);
1213         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1214                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1215                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1216                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1217                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1218 }
1219
1220 static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1221                        unsigned int set, unsigned int clear)
1222 {
1223         struct async_struct * info = tty->driver_data;
1224         unsigned long flags;
1225
1226         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1227                 return -ENODEV;
1228         if (tty->flags & (1 << TTY_IO_ERROR))
1229                 return -EIO;
1230
1231         local_irq_save(flags);
1232         if (set & TIOCM_RTS)
1233                 info->MCR |= SER_RTS;
1234         if (set & TIOCM_DTR)
1235                 info->MCR |= SER_DTR;
1236         if (clear & TIOCM_RTS)
1237                 info->MCR &= ~SER_RTS;
1238         if (clear & TIOCM_DTR)
1239                 info->MCR &= ~SER_DTR;
1240         rtsdtr_ctrl(info->MCR);
1241         local_irq_restore(flags);
1242         return 0;
1243 }
1244
1245 /*
1246  * rs_break() --- routine which turns the break handling on or off
1247  */
1248 static int rs_break(struct tty_struct *tty, int break_state)
1249 {
1250         struct async_struct * info = tty->driver_data;
1251         unsigned long flags;
1252
1253         if (serial_paranoia_check(info, tty->name, "rs_break"))
1254                 return -EINVAL;
1255
1256         local_irq_save(flags);
1257         if (break_state == -1)
1258           custom.adkcon = AC_SETCLR | AC_UARTBRK;
1259         else
1260           custom.adkcon = AC_UARTBRK;
1261         mb();
1262         local_irq_restore(flags);
1263         return 0;
1264 }
1265
1266 /*
1267  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1268  * Return: write counters to the user passed counter struct
1269  * NB: both 1->0 and 0->1 transitions are counted except for
1270  *     RI where only 0->1 is counted.
1271  */
1272 static int rs_get_icount(struct tty_struct *tty,
1273                                 struct serial_icounter_struct *icount)
1274 {
1275         struct async_struct *info = tty->driver_data;
1276         struct async_icount cnow;
1277         unsigned long flags;
1278
1279         local_irq_save(flags);
1280         cnow = info->state->icount;
1281         local_irq_restore(flags);
1282         icount->cts = cnow.cts;
1283         icount->dsr = cnow.dsr;
1284         icount->rng = cnow.rng;
1285         icount->dcd = cnow.dcd;
1286         icount->rx = cnow.rx;
1287         icount->tx = cnow.tx;
1288         icount->frame = cnow.frame;
1289         icount->overrun = cnow.overrun;
1290         icount->parity = cnow.parity;
1291         icount->brk = cnow.brk;
1292         icount->buf_overrun = cnow.buf_overrun;
1293
1294         return 0;
1295 }
1296
1297 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1298                     unsigned int cmd, unsigned long arg)
1299 {
1300         struct async_struct * info = tty->driver_data;
1301         struct async_icount cprev, cnow;        /* kernel counter temps */
1302         void __user *argp = (void __user *)arg;
1303         unsigned long flags;
1304
1305         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1306                 return -ENODEV;
1307
1308         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1309             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1310             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1311                 if (tty->flags & (1 << TTY_IO_ERROR))
1312                     return -EIO;
1313         }
1314
1315         switch (cmd) {
1316                 case TIOCGSERIAL:
1317                         return get_serial_info(info, argp);
1318                 case TIOCSSERIAL:
1319                         return set_serial_info(info, argp);
1320                 case TIOCSERCONFIG:
1321                         return 0;
1322
1323                 case TIOCSERGETLSR: /* Get line status register */
1324                         return get_lsr_info(info, argp);
1325
1326                 case TIOCSERGSTRUCT:
1327                         if (copy_to_user(argp,
1328                                          info, sizeof(struct async_struct)))
1329                                 return -EFAULT;
1330                         return 0;
1331
1332                 /*
1333                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1334                  * - mask passed in arg for lines of interest
1335                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1336                  * Caller should use TIOCGICOUNT to see which one it was
1337                  */
1338                 case TIOCMIWAIT:
1339                         local_irq_save(flags);
1340                         /* note the counters on entry */
1341                         cprev = info->state->icount;
1342                         local_irq_restore(flags);
1343                         while (1) {
1344                                 interruptible_sleep_on(&info->delta_msr_wait);
1345                                 /* see if a signal did it */
1346                                 if (signal_pending(current))
1347                                         return -ERESTARTSYS;
1348                                 local_irq_save(flags);
1349                                 cnow = info->state->icount; /* atomic copy */
1350                                 local_irq_restore(flags);
1351                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1352                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1353                                         return -EIO; /* no change => error */
1354                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1355                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1356                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1357                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1358                                         return 0;
1359                                 }
1360                                 cprev = cnow;
1361                         }
1362                         /* NOTREACHED */
1363
1364                 case TIOCSERGWILD:
1365                 case TIOCSERSWILD:
1366                         /* "setserial -W" is called in Debian boot */
1367                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1368                         return 0;
1369
1370                 default:
1371                         return -ENOIOCTLCMD;
1372                 }
1373         return 0;
1374 }
1375
1376 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1377 {
1378         struct async_struct *info = tty->driver_data;
1379         unsigned long flags;
1380         unsigned int cflag = tty->termios->c_cflag;
1381
1382         change_speed(info, old_termios);
1383
1384         /* Handle transition to B0 status */
1385         if ((old_termios->c_cflag & CBAUD) &&
1386             !(cflag & CBAUD)) {
1387                 info->MCR &= ~(SER_DTR|SER_RTS);
1388                 local_irq_save(flags);
1389                 rtsdtr_ctrl(info->MCR);
1390                 local_irq_restore(flags);
1391         }
1392
1393         /* Handle transition away from B0 status */
1394         if (!(old_termios->c_cflag & CBAUD) &&
1395             (cflag & CBAUD)) {
1396                 info->MCR |= SER_DTR;
1397                 if (!(tty->termios->c_cflag & CRTSCTS) ||
1398                     !test_bit(TTY_THROTTLED, &tty->flags)) {
1399                         info->MCR |= SER_RTS;
1400                 }
1401                 local_irq_save(flags);
1402                 rtsdtr_ctrl(info->MCR);
1403                 local_irq_restore(flags);
1404         }
1405
1406         /* Handle turning off CRTSCTS */
1407         if ((old_termios->c_cflag & CRTSCTS) &&
1408             !(tty->termios->c_cflag & CRTSCTS)) {
1409                 tty->hw_stopped = 0;
1410                 rs_start(tty);
1411         }
1412
1413 #if 0
1414         /*
1415          * No need to wake up processes in open wait, since they
1416          * sample the CLOCAL flag once, and don't recheck it.
1417          * XXX  It's not clear whether the current behavior is correct
1418          * or not.  Hence, this may change.....
1419          */
1420         if (!(old_termios->c_cflag & CLOCAL) &&
1421             (tty->termios->c_cflag & CLOCAL))
1422                 wake_up_interruptible(&info->open_wait);
1423 #endif
1424 }
1425
1426 /*
1427  * ------------------------------------------------------------
1428  * rs_close()
1429  *
1430  * This routine is called when the serial port gets closed.  First, we
1431  * wait for the last remaining data to be sent.  Then, we unlink its
1432  * async structure from the interrupt chain if necessary, and we free
1433  * that IRQ if nothing is left in the chain.
1434  * ------------------------------------------------------------
1435  */
1436 static void rs_close(struct tty_struct *tty, struct file * filp)
1437 {
1438         struct async_struct * info = tty->driver_data;
1439         struct serial_state *state;
1440         unsigned long flags;
1441
1442         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1443                 return;
1444
1445         state = info->state;
1446
1447         local_irq_save(flags);
1448
1449         if (tty_hung_up_p(filp)) {
1450                 DBG_CNT("before DEC-hung");
1451                 local_irq_restore(flags);
1452                 return;
1453         }
1454
1455 #ifdef SERIAL_DEBUG_OPEN
1456         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1457 #endif
1458         if ((tty->count == 1) && (state->count != 1)) {
1459                 /*
1460                  * Uh, oh.  tty->count is 1, which means that the tty
1461                  * structure will be freed.  state->count should always
1462                  * be one in these conditions.  If it's greater than
1463                  * one, we've got real problems, since it means the
1464                  * serial port won't be shutdown.
1465                  */
1466                 printk("rs_close: bad serial port count; tty->count is 1, "
1467                        "state->count is %d\n", state->count);
1468                 state->count = 1;
1469         }
1470         if (--state->count < 0) {
1471                 printk("rs_close: bad serial port count for ttys%d: %d\n",
1472                        info->line, state->count);
1473                 state->count = 0;
1474         }
1475         if (state->count) {
1476                 DBG_CNT("before DEC-2");
1477                 local_irq_restore(flags);
1478                 return;
1479         }
1480         info->flags |= ASYNC_CLOSING;
1481         /*
1482          * Now we wait for the transmit buffer to clear; and we notify
1483          * the line discipline to only process XON/XOFF characters.
1484          */
1485         tty->closing = 1;
1486         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1487                 tty_wait_until_sent(tty, info->closing_wait);
1488         /*
1489          * At this point we stop accepting input.  To do this, we
1490          * disable the receive line status interrupts, and tell the
1491          * interrupt driver to stop checking the data ready bit in the
1492          * line status register.
1493          */
1494         info->read_status_mask &= ~UART_LSR_DR;
1495         if (info->flags & ASYNC_INITIALIZED) {
1496                 /* disable receive interrupts */
1497                 custom.intena = IF_RBF;
1498                 mb();
1499                 /* clear any pending receive interrupt */
1500                 custom.intreq = IF_RBF;
1501                 mb();
1502
1503                 /*
1504                  * Before we drop DTR, make sure the UART transmitter
1505                  * has completely drained; this is especially
1506                  * important if there is a transmit FIFO!
1507                  */
1508                 rs_wait_until_sent(tty, info->timeout);
1509         }
1510         shutdown(info);
1511         rs_flush_buffer(tty);
1512
1513         tty_ldisc_flush(tty);
1514         tty->closing = 0;
1515         info->event = 0;
1516         info->tty = NULL;
1517         if (info->blocked_open) {
1518                 if (info->close_delay) {
1519                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1520                 }
1521                 wake_up_interruptible(&info->open_wait);
1522         }
1523         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1524         wake_up_interruptible(&info->close_wait);
1525         local_irq_restore(flags);
1526 }
1527
1528 /*
1529  * rs_wait_until_sent() --- wait until the transmitter is empty
1530  */
1531 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1532 {
1533         struct async_struct * info = tty->driver_data;
1534         unsigned long orig_jiffies, char_time;
1535         int tty_was_locked = tty_locked();
1536         int lsr;
1537
1538         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1539                 return;
1540
1541         if (info->xmit_fifo_size == 0)
1542                 return; /* Just in case.... */
1543
1544         orig_jiffies = jiffies;
1545
1546         /*
1547          * tty_wait_until_sent is called from lots of places,
1548          * with or without the BTM.
1549          */
1550         if (!tty_was_locked)
1551                 tty_lock();
1552         /*
1553          * Set the check interval to be 1/5 of the estimated time to
1554          * send a single character, and make it at least 1.  The check
1555          * interval should also be less than the timeout.
1556          *
1557          * Note: we have to use pretty tight timings here to satisfy
1558          * the NIST-PCTS.
1559          */
1560         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1561         char_time = char_time / 5;
1562         if (char_time == 0)
1563                 char_time = 1;
1564         if (timeout)
1565           char_time = min_t(unsigned long, char_time, timeout);
1566         /*
1567          * If the transmitter hasn't cleared in twice the approximate
1568          * amount of time to send the entire FIFO, it probably won't
1569          * ever clear.  This assumes the UART isn't doing flow
1570          * control, which is currently the case.  Hence, if it ever
1571          * takes longer than info->timeout, this is probably due to a
1572          * UART bug of some kind.  So, we clamp the timeout parameter at
1573          * 2*info->timeout.
1574          */
1575         if (!timeout || timeout > 2*info->timeout)
1576                 timeout = 2*info->timeout;
1577 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1578         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1579         printk("jiff=%lu...", jiffies);
1580 #endif
1581         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1582 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1583                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1584 #endif
1585                 msleep_interruptible(jiffies_to_msecs(char_time));
1586                 if (signal_pending(current))
1587                         break;
1588                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1589                         break;
1590         }
1591         __set_current_state(TASK_RUNNING);
1592         if (!tty_was_locked)
1593                 tty_unlock();
1594 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1595         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1596 #endif
1597 }
1598
1599 /*
1600  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1601  */
1602 static void rs_hangup(struct tty_struct *tty)
1603 {
1604         struct async_struct * info = tty->driver_data;
1605         struct serial_state *state = info->state;
1606
1607         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1608                 return;
1609
1610         state = info->state;
1611
1612         rs_flush_buffer(tty);
1613         shutdown(info);
1614         info->event = 0;
1615         state->count = 0;
1616         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1617         info->tty = NULL;
1618         wake_up_interruptible(&info->open_wait);
1619 }
1620
1621 /*
1622  * ------------------------------------------------------------
1623  * rs_open() and friends
1624  * ------------------------------------------------------------
1625  */
1626 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1627                            struct async_struct *info)
1628 {
1629 #ifdef DECLARE_WAITQUEUE
1630         DECLARE_WAITQUEUE(wait, current);
1631 #else
1632         struct wait_queue wait = { current, NULL };
1633 #endif
1634         struct serial_state *state = info->state;
1635         int             retval;
1636         int             do_clocal = 0, extra_count = 0;
1637         unsigned long   flags;
1638
1639         /*
1640          * If the device is in the middle of being closed, then block
1641          * until it's done, and then try again.
1642          */
1643         if (tty_hung_up_p(filp) ||
1644             (info->flags & ASYNC_CLOSING)) {
1645                 if (info->flags & ASYNC_CLOSING)
1646                         interruptible_sleep_on(&info->close_wait);
1647 #ifdef SERIAL_DO_RESTART
1648                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1649                         -EAGAIN : -ERESTARTSYS);
1650 #else
1651                 return -EAGAIN;
1652 #endif
1653         }
1654
1655         /*
1656          * If non-blocking mode is set, or the port is not enabled,
1657          * then make the check up front and then exit.
1658          */
1659         if ((filp->f_flags & O_NONBLOCK) ||
1660             (tty->flags & (1 << TTY_IO_ERROR))) {
1661                 info->flags |= ASYNC_NORMAL_ACTIVE;
1662                 return 0;
1663         }
1664
1665         if (tty->termios->c_cflag & CLOCAL)
1666                 do_clocal = 1;
1667
1668         /*
1669          * Block waiting for the carrier detect and the line to become
1670          * free (i.e., not in use by the callout).  While we are in
1671          * this loop, state->count is dropped by one, so that
1672          * rs_close() knows when to free things.  We restore it upon
1673          * exit, either normal or abnormal.
1674          */
1675         retval = 0;
1676         add_wait_queue(&info->open_wait, &wait);
1677 #ifdef SERIAL_DEBUG_OPEN
1678         printk("block_til_ready before block: ttys%d, count = %d\n",
1679                state->line, state->count);
1680 #endif
1681         local_irq_save(flags);
1682         if (!tty_hung_up_p(filp)) {
1683                 extra_count = 1;
1684                 state->count--;
1685         }
1686         local_irq_restore(flags);
1687         info->blocked_open++;
1688         while (1) {
1689                 local_irq_save(flags);
1690                 if (tty->termios->c_cflag & CBAUD)
1691                         rtsdtr_ctrl(SER_DTR|SER_RTS);
1692                 local_irq_restore(flags);
1693                 set_current_state(TASK_INTERRUPTIBLE);
1694                 if (tty_hung_up_p(filp) ||
1695                     !(info->flags & ASYNC_INITIALIZED)) {
1696 #ifdef SERIAL_DO_RESTART
1697                         if (info->flags & ASYNC_HUP_NOTIFY)
1698                                 retval = -EAGAIN;
1699                         else
1700                                 retval = -ERESTARTSYS;
1701 #else
1702                         retval = -EAGAIN;
1703 #endif
1704                         break;
1705                 }
1706                 if (!(info->flags & ASYNC_CLOSING) &&
1707                     (do_clocal || (!(ciab.pra & SER_DCD)) ))
1708                         break;
1709                 if (signal_pending(current)) {
1710                         retval = -ERESTARTSYS;
1711                         break;
1712                 }
1713 #ifdef SERIAL_DEBUG_OPEN
1714                 printk("block_til_ready blocking: ttys%d, count = %d\n",
1715                        info->line, state->count);
1716 #endif
1717                 tty_unlock();
1718                 schedule();
1719                 tty_lock();
1720         }
1721         __set_current_state(TASK_RUNNING);
1722         remove_wait_queue(&info->open_wait, &wait);
1723         if (extra_count)
1724                 state->count++;
1725         info->blocked_open--;
1726 #ifdef SERIAL_DEBUG_OPEN
1727         printk("block_til_ready after blocking: ttys%d, count = %d\n",
1728                info->line, state->count);
1729 #endif
1730         if (retval)
1731                 return retval;
1732         info->flags |= ASYNC_NORMAL_ACTIVE;
1733         return 0;
1734 }
1735
1736 static int get_async_struct(int line, struct async_struct **ret_info)
1737 {
1738         struct async_struct *info;
1739         struct serial_state *sstate;
1740
1741         sstate = rs_table + line;
1742         sstate->count++;
1743         if (sstate->info) {
1744                 *ret_info = sstate->info;
1745                 return 0;
1746         }
1747         info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1748         if (!info) {
1749                 sstate->count--;
1750                 return -ENOMEM;
1751         }
1752 #ifdef DECLARE_WAITQUEUE
1753         init_waitqueue_head(&info->open_wait);
1754         init_waitqueue_head(&info->close_wait);
1755         init_waitqueue_head(&info->delta_msr_wait);
1756 #endif
1757         info->magic = SERIAL_MAGIC;
1758         info->port = sstate->port;
1759         info->flags = sstate->flags;
1760         info->xmit_fifo_size = sstate->xmit_fifo_size;
1761         info->line = line;
1762         tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1763         info->state = sstate;
1764         if (sstate->info) {
1765                 kfree(info);
1766                 *ret_info = sstate->info;
1767                 return 0;
1768         }
1769         *ret_info = sstate->info = info;
1770         return 0;
1771 }
1772
1773 /*
1774  * This routine is called whenever a serial port is opened.  It
1775  * enables interrupts for a serial port, linking in its async structure into
1776  * the IRQ chain.   It also performs the serial-specific
1777  * initialization for the tty structure.
1778  */
1779 static int rs_open(struct tty_struct *tty, struct file * filp)
1780 {
1781         struct async_struct     *info;
1782         int                     retval, line;
1783
1784         line = tty->index;
1785         if ((line < 0) || (line >= NR_PORTS)) {
1786                 return -ENODEV;
1787         }
1788         retval = get_async_struct(line, &info);
1789         if (retval) {
1790                 return retval;
1791         }
1792         tty->driver_data = info;
1793         info->tty = tty;
1794         if (serial_paranoia_check(info, tty->name, "rs_open"))
1795                 return -ENODEV;
1796
1797 #ifdef SERIAL_DEBUG_OPEN
1798         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1799 #endif
1800         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1801
1802         /*
1803          * If the port is the middle of closing, bail out now
1804          */
1805         if (tty_hung_up_p(filp) ||
1806             (info->flags & ASYNC_CLOSING)) {
1807                 if (info->flags & ASYNC_CLOSING)
1808                         interruptible_sleep_on(&info->close_wait);
1809 #ifdef SERIAL_DO_RESTART
1810                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1811                         -EAGAIN : -ERESTARTSYS);
1812 #else
1813                 return -EAGAIN;
1814 #endif
1815         }
1816
1817         /*
1818          * Start up serial port
1819          */
1820         retval = startup(info);
1821         if (retval) {
1822                 return retval;
1823         }
1824
1825         retval = block_til_ready(tty, filp, info);
1826         if (retval) {
1827 #ifdef SERIAL_DEBUG_OPEN
1828                 printk("rs_open returning after block_til_ready with %d\n",
1829                        retval);
1830 #endif
1831                 return retval;
1832         }
1833
1834 #ifdef SERIAL_DEBUG_OPEN
1835         printk("rs_open %s successful...", tty->name);
1836 #endif
1837         return 0;
1838 }
1839
1840 /*
1841  * /proc fs routines....
1842  */
1843
1844 static inline void line_info(struct seq_file *m, struct serial_state *state)
1845 {
1846         struct async_struct *info = state->info, scr_info;
1847         char    stat_buf[30], control, status;
1848         unsigned long flags;
1849
1850         seq_printf(m, "%d: uart:amiga_builtin",state->line);
1851
1852         /*
1853          * Figure out the current RS-232 lines
1854          */
1855         if (!info) {
1856                 info = &scr_info;       /* This is just for serial_{in,out} */
1857
1858                 info->magic = SERIAL_MAGIC;
1859                 info->flags = state->flags;
1860                 info->quot = 0;
1861                 info->tty = NULL;
1862         }
1863         local_irq_save(flags);
1864         status = ciab.pra;
1865         control = info ? info->MCR : status;
1866         local_irq_restore(flags);
1867
1868         stat_buf[0] = 0;
1869         stat_buf[1] = 0;
1870         if(!(control & SER_RTS))
1871                 strcat(stat_buf, "|RTS");
1872         if(!(status & SER_CTS))
1873                 strcat(stat_buf, "|CTS");
1874         if(!(control & SER_DTR))
1875                 strcat(stat_buf, "|DTR");
1876         if(!(status & SER_DSR))
1877                 strcat(stat_buf, "|DSR");
1878         if(!(status & SER_DCD))
1879                 strcat(stat_buf, "|CD");
1880
1881         if (info->quot) {
1882                 seq_printf(m, " baud:%d", state->baud_base / info->quot);
1883         }
1884
1885         seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1886
1887         if (state->icount.frame)
1888                 seq_printf(m, " fe:%d", state->icount.frame);
1889
1890         if (state->icount.parity)
1891                 seq_printf(m, " pe:%d", state->icount.parity);
1892
1893         if (state->icount.brk)
1894                 seq_printf(m, " brk:%d", state->icount.brk);
1895
1896         if (state->icount.overrun)
1897                 seq_printf(m, " oe:%d", state->icount.overrun);
1898
1899         /*
1900          * Last thing is the RS-232 status lines
1901          */
1902         seq_printf(m, " %s\n", stat_buf+1);
1903 }
1904
1905 static int rs_proc_show(struct seq_file *m, void *v)
1906 {
1907         seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1908         line_info(m, &rs_table[0]);
1909         return 0;
1910 }
1911
1912 static int rs_proc_open(struct inode *inode, struct file *file)
1913 {
1914         return single_open(file, rs_proc_show, NULL);
1915 }
1916
1917 static const struct file_operations rs_proc_fops = {
1918         .owner          = THIS_MODULE,
1919         .open           = rs_proc_open,
1920         .read           = seq_read,
1921         .llseek         = seq_lseek,
1922         .release        = single_release,
1923 };
1924
1925 /*
1926  * ---------------------------------------------------------------------
1927  * rs_init() and friends
1928  *
1929  * rs_init() is called at boot-time to initialize the serial driver.
1930  * ---------------------------------------------------------------------
1931  */
1932
1933 /*
1934  * This routine prints out the appropriate serial driver version
1935  * number, and identifies which options were configured into this
1936  * driver.
1937  */
1938 static void show_serial_version(void)
1939 {
1940         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1941 }
1942
1943
1944 static const struct tty_operations serial_ops = {
1945         .open = rs_open,
1946         .close = rs_close,
1947         .write = rs_write,
1948         .put_char = rs_put_char,
1949         .flush_chars = rs_flush_chars,
1950         .write_room = rs_write_room,
1951         .chars_in_buffer = rs_chars_in_buffer,
1952         .flush_buffer = rs_flush_buffer,
1953         .ioctl = rs_ioctl,
1954         .throttle = rs_throttle,
1955         .unthrottle = rs_unthrottle,
1956         .set_termios = rs_set_termios,
1957         .stop = rs_stop,
1958         .start = rs_start,
1959         .hangup = rs_hangup,
1960         .break_ctl = rs_break,
1961         .send_xchar = rs_send_xchar,
1962         .wait_until_sent = rs_wait_until_sent,
1963         .tiocmget = rs_tiocmget,
1964         .tiocmset = rs_tiocmset,
1965         .get_icount = rs_get_icount,
1966         .proc_fops = &rs_proc_fops,
1967 };
1968
1969 /*
1970  * The serial driver boot-time initialization code!
1971  */
1972 static int __init amiga_serial_probe(struct platform_device *pdev)
1973 {
1974         unsigned long flags;
1975         struct serial_state * state;
1976         int error;
1977
1978         serial_driver = alloc_tty_driver(1);
1979         if (!serial_driver)
1980                 return -ENOMEM;
1981
1982         IRQ_ports = NULL;
1983
1984         show_serial_version();
1985
1986         /* Initialize the tty_driver structure */
1987
1988         serial_driver->owner = THIS_MODULE;
1989         serial_driver->driver_name = "amiserial";
1990         serial_driver->name = "ttyS";
1991         serial_driver->major = TTY_MAJOR;
1992         serial_driver->minor_start = 64;
1993         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1994         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1995         serial_driver->init_termios = tty_std_termios;
1996         serial_driver->init_termios.c_cflag =
1997                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1998         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1999         tty_set_operations(serial_driver, &serial_ops);
2000
2001         error = tty_register_driver(serial_driver);
2002         if (error)
2003                 goto fail_put_tty_driver;
2004
2005         state = rs_table;
2006         state->magic = SSTATE_MAGIC;
2007         state->port = (int)&custom.serdatr; /* Just to give it a value */
2008         state->line = 0;
2009         state->custom_divisor = 0;
2010         state->close_delay = 5*HZ/10;
2011         state->closing_wait = 30*HZ;
2012         state->icount.cts = state->icount.dsr =
2013           state->icount.rng = state->icount.dcd = 0;
2014         state->icount.rx = state->icount.tx = 0;
2015         state->icount.frame = state->icount.parity = 0;
2016         state->icount.overrun = state->icount.brk = 0;
2017
2018         printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2019                        state->line);
2020
2021         /* Hardware set up */
2022
2023         state->baud_base = amiga_colorclock;
2024         state->xmit_fifo_size = 1;
2025
2026         /* set ISRs, and then disable the rx interrupts */
2027         error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2028         if (error)
2029                 goto fail_unregister;
2030
2031         error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
2032                             "serial RX", state);
2033         if (error)
2034                 goto fail_free_irq;
2035
2036         local_irq_save(flags);
2037
2038         /* turn off Rx and Tx interrupts */
2039         custom.intena = IF_RBF | IF_TBE;
2040         mb();
2041
2042         /* clear any pending interrupt */
2043         custom.intreq = IF_RBF | IF_TBE;
2044         mb();
2045
2046         local_irq_restore(flags);
2047
2048         /*
2049          * set the appropriate directions for the modem control flags,
2050          * and clear RTS and DTR
2051          */
2052         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
2053         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
2054
2055         platform_set_drvdata(pdev, state);
2056
2057         return 0;
2058
2059 fail_free_irq:
2060         free_irq(IRQ_AMIGA_TBE, state);
2061 fail_unregister:
2062         tty_unregister_driver(serial_driver);
2063 fail_put_tty_driver:
2064         put_tty_driver(serial_driver);
2065         return error;
2066 }
2067
2068 static int __exit amiga_serial_remove(struct platform_device *pdev)
2069 {
2070         int error;
2071         struct serial_state *state = platform_get_drvdata(pdev);
2072         struct async_struct *info = state->info;
2073
2074         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2075         tasklet_kill(&info->tlet);
2076         if ((error = tty_unregister_driver(serial_driver)))
2077                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2078                        error);
2079         put_tty_driver(serial_driver);
2080
2081         rs_table[0].info = NULL;
2082         kfree(info);
2083
2084         free_irq(IRQ_AMIGA_TBE, rs_table);
2085         free_irq(IRQ_AMIGA_RBF, rs_table);
2086
2087         platform_set_drvdata(pdev, NULL);
2088
2089         return error;
2090 }
2091
2092 static struct platform_driver amiga_serial_driver = {
2093         .remove = __exit_p(amiga_serial_remove),
2094         .driver   = {
2095                 .name   = "amiga-serial",
2096                 .owner  = THIS_MODULE,
2097         },
2098 };
2099
2100 static int __init amiga_serial_init(void)
2101 {
2102         return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
2103 }
2104
2105 module_init(amiga_serial_init);
2106
2107 static void __exit amiga_serial_exit(void)
2108 {
2109         platform_driver_unregister(&amiga_serial_driver);
2110 }
2111
2112 module_exit(amiga_serial_exit);
2113
2114
2115 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2116
2117 /*
2118  * ------------------------------------------------------------
2119  * Serial console driver
2120  * ------------------------------------------------------------
2121  */
2122
2123 static void amiga_serial_putc(char c)
2124 {
2125         custom.serdat = (unsigned char)c | 0x100;
2126         while (!(custom.serdatr & 0x2000))
2127                 barrier();
2128 }
2129
2130 /*
2131  *      Print a string to the serial port trying not to disturb
2132  *      any possible real use of the port...
2133  *
2134  *      The console must be locked when we get here.
2135  */
2136 static void serial_console_write(struct console *co, const char *s,
2137                                 unsigned count)
2138 {
2139         unsigned short intena = custom.intenar;
2140
2141         custom.intena = IF_TBE;
2142
2143         while (count--) {
2144                 if (*s == '\n')
2145                         amiga_serial_putc('\r');
2146                 amiga_serial_putc(*s++);
2147         }
2148
2149         custom.intena = IF_SETCLR | (intena & IF_TBE);
2150 }
2151
2152 static struct tty_driver *serial_console_device(struct console *c, int *index)
2153 {
2154         *index = 0;
2155         return serial_driver;
2156 }
2157
2158 static struct console sercons = {
2159         .name =         "ttyS",
2160         .write =        serial_console_write,
2161         .device =       serial_console_device,
2162         .flags =        CON_PRINTBUFFER,
2163         .index =        -1,
2164 };
2165
2166 /*
2167  *      Register console.
2168  */
2169 static int __init amiserial_console_init(void)
2170 {
2171         register_console(&sercons);
2172         return 0;
2173 }
2174 console_initcall(amiserial_console_init);
2175
2176 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
2177
2178 MODULE_LICENSE("GPL");
2179 MODULE_ALIAS("platform:amiga-serial");