linux/drivers/char/amiserial.c
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   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>
  65static 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/slab.h>
  83#include <linux/init.h>
  84#include <linux/bitops.h>
  85
  86#include <asm/setup.h>
  87
  88#include <asm/system.h>
  89
  90#include <asm/irq.h>
  91
  92#include <asm/amigahw.h>
  93#include <asm/amigaints.h>
  94
  95#define custom amiga_custom
  96static char *serial_name = "Amiga-builtin serial driver";
  97
  98static struct tty_driver *serial_driver;
  99
 100/* number of characters left in xmit buffer before we ask for more */
 101#define WAKEUP_CHARS 256
 102
 103static struct async_struct *IRQ_ports;
 104
 105static unsigned char current_ctl_bits;
 106
 107static void change_speed(struct async_struct *info, struct ktermios *old);
 108static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
 109
 110
 111static struct serial_state rs_table[1];
 112
 113#define NR_PORTS ARRAY_SIZE(rs_table)
 114
 115#include <asm/uaccess.h>
 116
 117#define serial_isroot() (capable(CAP_SYS_ADMIN))
 118
 119
 120static inline int serial_paranoia_check(struct async_struct *info,
 121                                        char *name, const char *routine)
 122{
 123#ifdef SERIAL_PARANOIA_CHECK
 124        static const char *badmagic =
 125                "Warning: bad magic number for serial struct (%s) in %s\n";
 126        static const char *badinfo =
 127                "Warning: null async_struct for (%s) in %s\n";
 128
 129        if (!info) {
 130                printk(badinfo, name, routine);
 131                return 1;
 132        }
 133        if (info->magic != SERIAL_MAGIC) {
 134                printk(badmagic, name, routine);
 135                return 1;
 136        }
 137#endif
 138        return 0;
 139}
 140
 141/* some serial hardware definitions */
 142#define SDR_OVRUN   (1<<15)
 143#define SDR_RBF     (1<<14)
 144#define SDR_TBE     (1<<13)
 145#define SDR_TSRE    (1<<12)
 146
 147#define SERPER_PARENB    (1<<15)
 148
 149#define AC_SETCLR   (1<<15)
 150#define AC_UARTBRK  (1<<11)
 151
 152#define SER_DTR     (1<<7)
 153#define SER_RTS     (1<<6)
 154#define SER_DCD     (1<<5)
 155#define SER_CTS     (1<<4)
 156#define SER_DSR     (1<<3)
 157
 158static __inline__ void rtsdtr_ctrl(int bits)
 159{
 160    ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
 161}
 162
 163/*
 164 * ------------------------------------------------------------
 165 * rs_stop() and rs_start()
 166 *
 167 * This routines are called before setting or resetting tty->stopped.
 168 * They enable or disable transmitter interrupts, as necessary.
 169 * ------------------------------------------------------------
 170 */
 171static void rs_stop(struct tty_struct *tty)
 172{
 173        struct async_struct *info = (struct async_struct *)tty->driver_data;
 174        unsigned long flags;
 175
 176        if (serial_paranoia_check(info, tty->name, "rs_stop"))
 177                return;
 178
 179        local_irq_save(flags);
 180        if (info->IER & UART_IER_THRI) {
 181                info->IER &= ~UART_IER_THRI;
 182                /* disable Tx interrupt and remove any pending interrupts */
 183                custom.intena = IF_TBE;
 184                mb();
 185                custom.intreq = IF_TBE;
 186                mb();
 187        }
 188        local_irq_restore(flags);
 189}
 190
 191static void rs_start(struct tty_struct *tty)
 192{
 193        struct async_struct *info = (struct async_struct *)tty->driver_data;
 194        unsigned long flags;
 195
 196        if (serial_paranoia_check(info, tty->name, "rs_start"))
 197                return;
 198
 199        local_irq_save(flags);
 200        if (info->xmit.head != info->xmit.tail
 201            && info->xmit.buf
 202            && !(info->IER & UART_IER_THRI)) {
 203                info->IER |= UART_IER_THRI;
 204                custom.intena = IF_SETCLR | IF_TBE;
 205                mb();
 206                /* set a pending Tx Interrupt, transmitter should restart now */
 207                custom.intreq = IF_SETCLR | IF_TBE;
 208                mb();
 209        }
 210        local_irq_restore(flags);
 211}
 212
 213/*
 214 * ----------------------------------------------------------------------
 215 *
 216 * Here starts the interrupt handling routines.  All of the following
 217 * subroutines are declared as inline and are folded into
 218 * rs_interrupt().  They were separated out for readability's sake.
 219 *
 220 * Note: rs_interrupt() is a "fast" interrupt, which means that it
 221 * runs with interrupts turned off.  People who may want to modify
 222 * rs_interrupt() should try to keep the interrupt handler as fast as
 223 * possible.  After you are done making modifications, it is not a bad
 224 * idea to do:
 225 * 
 226 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 227 *
 228 * and look at the resulting assemble code in serial.s.
 229 *
 230 *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
 231 * -----------------------------------------------------------------------
 232 */
 233
 234/*
 235 * This routine is used by the interrupt handler to schedule
 236 * processing in the software interrupt portion of the driver.
 237 */
 238static void rs_sched_event(struct async_struct *info,
 239                           int event)
 240{
 241        info->event |= 1 << event;
 242        tasklet_schedule(&info->tlet);
 243}
 244
 245static void receive_chars(struct async_struct *info)
 246{
 247        int status;
 248        int serdatr;
 249        struct tty_struct *tty = info->tty;
 250        unsigned char ch, flag;
 251        struct  async_icount *icount;
 252        int oe = 0;
 253
 254        icount = &info->state->icount;
 255
 256        status = UART_LSR_DR; /* We obviously have a character! */
 257        serdatr = custom.serdatr;
 258        mb();
 259        custom.intreq = IF_RBF;
 260        mb();
 261
 262        if((serdatr & 0x1ff) == 0)
 263            status |= UART_LSR_BI;
 264        if(serdatr & SDR_OVRUN)
 265            status |= UART_LSR_OE;
 266
 267        ch = serdatr & 0xff;
 268        icount->rx++;
 269
 270#ifdef SERIAL_DEBUG_INTR
 271        printk("DR%02x:%02x...", ch, status);
 272#endif
 273        flag = TTY_NORMAL;
 274
 275        /*
 276         * We don't handle parity or frame errors - but I have left
 277         * the code in, since I'm not sure that the errors can't be
 278         * detected.
 279         */
 280
 281        if (status & (UART_LSR_BI | UART_LSR_PE |
 282                      UART_LSR_FE | UART_LSR_OE)) {
 283          /*
 284           * For statistics only
 285           */
 286          if (status & UART_LSR_BI) {
 287            status &= ~(UART_LSR_FE | UART_LSR_PE);
 288            icount->brk++;
 289          } else if (status & UART_LSR_PE)
 290            icount->parity++;
 291          else if (status & UART_LSR_FE)
 292            icount->frame++;
 293          if (status & UART_LSR_OE)
 294            icount->overrun++;
 295
 296          /*
 297           * Now check to see if character should be
 298           * ignored, and mask off conditions which
 299           * should be ignored.
 300           */
 301          if (status & info->ignore_status_mask)
 302            goto out;
 303
 304          status &= info->read_status_mask;
 305
 306          if (status & (UART_LSR_BI)) {
 307#ifdef SERIAL_DEBUG_INTR
 308            printk("handling break....");
 309#endif
 310            flag = TTY_BREAK;
 311            if (info->flags & ASYNC_SAK)
 312              do_SAK(tty);
 313          } else if (status & UART_LSR_PE)
 314            flag = TTY_PARITY;
 315          else if (status & UART_LSR_FE)
 316            flag = TTY_FRAME;
 317          if (status & UART_LSR_OE) {
 318            /*
 319             * Overrun is special, since it's
 320             * reported immediately, and doesn't
 321             * affect the current character
 322             */
 323             oe = 1;
 324          }
 325        }
 326        tty_insert_flip_char(tty, ch, flag);
 327        if (oe == 1)
 328                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 329        tty_flip_buffer_push(tty);
 330out:
 331        return;
 332}
 333
 334static void transmit_chars(struct async_struct *info)
 335{
 336        custom.intreq = IF_TBE;
 337        mb();
 338        if (info->x_char) {
 339                custom.serdat = info->x_char | 0x100;
 340                mb();
 341                info->state->icount.tx++;
 342                info->x_char = 0;
 343                return;
 344        }
 345        if (info->xmit.head == info->xmit.tail
 346            || info->tty->stopped
 347            || info->tty->hw_stopped) {
 348                info->IER &= ~UART_IER_THRI;
 349                custom.intena = IF_TBE;
 350                mb();
 351                return;
 352        }
 353
 354        custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
 355        mb();
 356        info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
 357        info->state->icount.tx++;
 358
 359        if (CIRC_CNT(info->xmit.head,
 360                     info->xmit.tail,
 361                     SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
 362                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
 363
 364#ifdef SERIAL_DEBUG_INTR
 365        printk("THRE...");
 366#endif
 367        if (info->xmit.head == info->xmit.tail) {
 368                custom.intena = IF_TBE;
 369                mb();
 370                info->IER &= ~UART_IER_THRI;
 371        }
 372}
 373
 374static void check_modem_status(struct async_struct *info)
 375{
 376        unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 377        unsigned char dstatus;
 378        struct  async_icount *icount;
 379
 380        /* Determine bits that have changed */
 381        dstatus = status ^ current_ctl_bits;
 382        current_ctl_bits = status;
 383
 384        if (dstatus) {
 385                icount = &info->state->icount;
 386                /* update input line counters */
 387                if (dstatus & SER_DSR)
 388                        icount->dsr++;
 389                if (dstatus & SER_DCD) {
 390                        icount->dcd++;
 391#ifdef CONFIG_HARD_PPS
 392                        if ((info->flags & ASYNC_HARDPPS_CD) &&
 393                            !(status & SER_DCD))
 394                                hardpps();
 395#endif
 396                }
 397                if (dstatus & SER_CTS)
 398                        icount->cts++;
 399                wake_up_interruptible(&info->delta_msr_wait);
 400        }
 401
 402        if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
 403#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
 404                printk("ttyS%d CD now %s...", info->line,
 405                       (!(status & SER_DCD)) ? "on" : "off");
 406#endif
 407                if (!(status & SER_DCD))
 408                        wake_up_interruptible(&info->open_wait);
 409                else {
 410#ifdef SERIAL_DEBUG_OPEN
 411                        printk("doing serial hangup...");
 412#endif
 413                        if (info->tty)
 414                                tty_hangup(info->tty);
 415                }
 416        }
 417        if (info->flags & ASYNC_CTS_FLOW) {
 418                if (info->tty->hw_stopped) {
 419                        if (!(status & SER_CTS)) {
 420#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 421                                printk("CTS tx start...");
 422#endif
 423                                info->tty->hw_stopped = 0;
 424                                info->IER |= UART_IER_THRI;
 425                                custom.intena = IF_SETCLR | IF_TBE;
 426                                mb();
 427                                /* set a pending Tx Interrupt, transmitter should restart now */
 428                                custom.intreq = IF_SETCLR | IF_TBE;
 429                                mb();
 430                                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
 431                                return;
 432                        }
 433                } else {
 434                        if ((status & SER_CTS)) {
 435#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 436                                printk("CTS tx stop...");
 437#endif
 438                                info->tty->hw_stopped = 1;
 439                                info->IER &= ~UART_IER_THRI;
 440                                /* disable Tx interrupt and remove any pending interrupts */
 441                                custom.intena = IF_TBE;
 442                                mb();
 443                                custom.intreq = IF_TBE;
 444                                mb();
 445                        }
 446                }
 447        }
 448}
 449
 450static irqreturn_t ser_vbl_int( int irq, void *data)
 451{
 452        /* vbl is just a periodic interrupt we tie into to update modem status */
 453        struct async_struct * info = IRQ_ports;
 454        /*
 455         * TBD - is it better to unregister from this interrupt or to
 456         * ignore it if MSI is clear ?
 457         */
 458        if(info->IER & UART_IER_MSI)
 459          check_modem_status(info);
 460        return IRQ_HANDLED;
 461}
 462
 463static irqreturn_t ser_rx_int(int irq, void *dev_id)
 464{
 465        struct async_struct * info;
 466
 467#ifdef SERIAL_DEBUG_INTR
 468        printk("ser_rx_int...");
 469#endif
 470
 471        info = IRQ_ports;
 472        if (!info || !info->tty)
 473                return IRQ_NONE;
 474
 475        receive_chars(info);
 476        info->last_active = jiffies;
 477#ifdef SERIAL_DEBUG_INTR
 478        printk("end.\n");
 479#endif
 480        return IRQ_HANDLED;
 481}
 482
 483static irqreturn_t ser_tx_int(int irq, void *dev_id)
 484{
 485        struct async_struct * info;
 486
 487        if (custom.serdatr & SDR_TBE) {
 488#ifdef SERIAL_DEBUG_INTR
 489          printk("ser_tx_int...");
 490#endif
 491
 492          info = IRQ_ports;
 493          if (!info || !info->tty)
 494                return IRQ_NONE;
 495
 496          transmit_chars(info);
 497          info->last_active = jiffies;
 498#ifdef SERIAL_DEBUG_INTR
 499          printk("end.\n");
 500#endif
 501        }
 502        return IRQ_HANDLED;
 503}
 504
 505/*
 506 * -------------------------------------------------------------------
 507 * Here ends the serial interrupt routines.
 508 * -------------------------------------------------------------------
 509 */
 510
 511/*
 512 * This routine is used to handle the "bottom half" processing for the
 513 * serial driver, known also the "software interrupt" processing.
 514 * This processing is done at the kernel interrupt level, after the
 515 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
 516 * is where time-consuming activities which can not be done in the
 517 * interrupt driver proper are done; the interrupt driver schedules
 518 * them using rs_sched_event(), and they get done here.
 519 */
 520
 521static void do_softint(unsigned long private_)
 522{
 523        struct async_struct     *info = (struct async_struct *) private_;
 524        struct tty_struct       *tty;
 525
 526        tty = info->tty;
 527        if (!tty)
 528                return;
 529
 530        if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
 531                tty_wakeup(tty);
 532}
 533
 534/*
 535 * ---------------------------------------------------------------
 536 * Low level utility subroutines for the serial driver:  routines to
 537 * figure out the appropriate timeout for an interrupt chain, routines
 538 * to initialize and startup a serial port, and routines to shutdown a
 539 * serial port.  Useful stuff like that.
 540 * ---------------------------------------------------------------
 541 */
 542
 543static int startup(struct async_struct * info)
 544{
 545        unsigned long flags;
 546        int     retval=0;
 547        unsigned long page;
 548
 549        page = get_zeroed_page(GFP_KERNEL);
 550        if (!page)
 551                return -ENOMEM;
 552
 553        local_irq_save(flags);
 554
 555        if (info->flags & ASYNC_INITIALIZED) {
 556                free_page(page);
 557                goto errout;
 558        }
 559
 560        if (info->xmit.buf)
 561                free_page(page);
 562        else
 563                info->xmit.buf = (unsigned char *) page;
 564
 565#ifdef SERIAL_DEBUG_OPEN
 566        printk("starting up ttys%d ...", info->line);
 567#endif
 568
 569        /* Clear anything in the input buffer */
 570
 571        custom.intreq = IF_RBF;
 572        mb();
 573
 574        retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
 575        if (retval) {
 576          if (serial_isroot()) {
 577            if (info->tty)
 578              set_bit(TTY_IO_ERROR,
 579                      &info->tty->flags);
 580            retval = 0;
 581          }
 582          goto errout;
 583        }
 584
 585        /* enable both Rx and Tx interrupts */
 586        custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
 587        mb();
 588        info->IER = UART_IER_MSI;
 589
 590        /* remember current state of the DCD and CTS bits */
 591        current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 592
 593        IRQ_ports = info;
 594
 595        info->MCR = 0;
 596        if (info->tty->termios->c_cflag & CBAUD)
 597          info->MCR = SER_DTR | SER_RTS;
 598        rtsdtr_ctrl(info->MCR);
 599
 600        if (info->tty)
 601                clear_bit(TTY_IO_ERROR, &info->tty->flags);
 602        info->xmit.head = info->xmit.tail = 0;
 603
 604        /*
 605         * Set up the tty->alt_speed kludge
 606         */
 607        if (info->tty) {
 608                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 609                        info->tty->alt_speed = 57600;
 610                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 611                        info->tty->alt_speed = 115200;
 612                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 613                        info->tty->alt_speed = 230400;
 614                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 615                        info->tty->alt_speed = 460800;
 616        }
 617
 618        /*
 619         * and set the speed of the serial port
 620         */
 621        change_speed(info, NULL);
 622
 623        info->flags |= ASYNC_INITIALIZED;
 624        local_irq_restore(flags);
 625        return 0;
 626
 627errout:
 628        local_irq_restore(flags);
 629        return retval;
 630}
 631
 632/*
 633 * This routine will shutdown a serial port; interrupts are disabled, and
 634 * DTR is dropped if the hangup on close termio flag is on.
 635 */
 636static void shutdown(struct async_struct * info)
 637{
 638        unsigned long   flags;
 639        struct serial_state *state;
 640
 641        if (!(info->flags & ASYNC_INITIALIZED))
 642                return;
 643
 644        state = info->state;
 645
 646#ifdef SERIAL_DEBUG_OPEN
 647        printk("Shutting down serial port %d ....\n", info->line);
 648#endif
 649
 650        local_irq_save(flags); /* Disable interrupts */
 651
 652        /*
 653         * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 654         * here so the queue might never be waken up
 655         */
 656        wake_up_interruptible(&info->delta_msr_wait);
 657
 658        IRQ_ports = NULL;
 659
 660        /*
 661         * Free the IRQ, if necessary
 662         */
 663        free_irq(IRQ_AMIGA_VERTB, info);
 664
 665        if (info->xmit.buf) {
 666                free_page((unsigned long) info->xmit.buf);
 667                info->xmit.buf = NULL;
 668        }
 669
 670        info->IER = 0;
 671        custom.intena = IF_RBF | IF_TBE;
 672        mb();
 673
 674        /* disable break condition */
 675        custom.adkcon = AC_UARTBRK;
 676        mb();
 677
 678        if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
 679                info->MCR &= ~(SER_DTR|SER_RTS);
 680        rtsdtr_ctrl(info->MCR);
 681
 682        if (info->tty)
 683                set_bit(TTY_IO_ERROR, &info->tty->flags);
 684
 685        info->flags &= ~ASYNC_INITIALIZED;
 686        local_irq_restore(flags);
 687}
 688
 689
 690/*
 691 * This routine is called to set the UART divisor registers to match
 692 * the specified baud rate for a serial port.
 693 */
 694static void change_speed(struct async_struct *info,
 695                         struct ktermios *old_termios)
 696{
 697        int     quot = 0, baud_base, baud;
 698        unsigned cflag, cval = 0;
 699        int     bits;
 700        unsigned long   flags;
 701
 702        if (!info->tty || !info->tty->termios)
 703                return;
 704        cflag = info->tty->termios->c_cflag;
 705
 706        /* Byte size is always 8 bits plus parity bit if requested */
 707
 708        cval = 3; bits = 10;
 709        if (cflag & CSTOPB) {
 710                cval |= 0x04;
 711                bits++;
 712        }
 713        if (cflag & PARENB) {
 714                cval |= UART_LCR_PARITY;
 715                bits++;
 716        }
 717        if (!(cflag & PARODD))
 718                cval |= UART_LCR_EPAR;
 719#ifdef CMSPAR
 720        if (cflag & CMSPAR)
 721                cval |= UART_LCR_SPAR;
 722#endif
 723
 724        /* Determine divisor based on baud rate */
 725        baud = tty_get_baud_rate(info->tty);
 726        if (!baud)
 727                baud = 9600;    /* B0 transition handled in rs_set_termios */
 728        baud_base = info->state->baud_base;
 729        if (baud == 38400 &&
 730            ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
 731                quot = info->state->custom_divisor;
 732        else {
 733                if (baud == 134)
 734                        /* Special case since 134 is really 134.5 */
 735                        quot = (2*baud_base / 269);
 736                else if (baud)
 737                        quot = baud_base / baud;
 738        }
 739        /* If the quotient is zero refuse the change */
 740        if (!quot && old_termios) {
 741                /* FIXME: Will need updating for new tty in the end */
 742                info->tty->termios->c_cflag &= ~CBAUD;
 743                info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
 744                baud = tty_get_baud_rate(info->tty);
 745                if (!baud)
 746                        baud = 9600;
 747                if (baud == 38400 &&
 748                    ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
 749                        quot = info->state->custom_divisor;
 750                else {
 751                        if (baud == 134)
 752                                /* Special case since 134 is really 134.5 */
 753                                quot = (2*baud_base / 269);
 754                        else if (baud)
 755                                quot = baud_base / baud;
 756                }
 757        }
 758        /* As a last resort, if the quotient is zero, default to 9600 bps */
 759        if (!quot)
 760                quot = baud_base / 9600;
 761        info->quot = quot;
 762        info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
 763        info->timeout += HZ/50;         /* Add .02 seconds of slop */
 764
 765        /* CTS flow control flag and modem status interrupts */
 766        info->IER &= ~UART_IER_MSI;
 767        if (info->flags & ASYNC_HARDPPS_CD)
 768                info->IER |= UART_IER_MSI;
 769        if (cflag & CRTSCTS) {
 770                info->flags |= ASYNC_CTS_FLOW;
 771                info->IER |= UART_IER_MSI;
 772        } else
 773                info->flags &= ~ASYNC_CTS_FLOW;
 774        if (cflag & CLOCAL)
 775                info->flags &= ~ASYNC_CHECK_CD;
 776        else {
 777                info->flags |= ASYNC_CHECK_CD;
 778                info->IER |= UART_IER_MSI;
 779        }
 780        /* TBD:
 781         * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
 782         */
 783
 784        /*
 785         * Set up parity check flag
 786         */
 787
 788        info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
 789        if (I_INPCK(info->tty))
 790                info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 791        if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
 792                info->read_status_mask |= UART_LSR_BI;
 793
 794        /*
 795         * Characters to ignore
 796         */
 797        info->ignore_status_mask = 0;
 798        if (I_IGNPAR(info->tty))
 799                info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 800        if (I_IGNBRK(info->tty)) {
 801                info->ignore_status_mask |= UART_LSR_BI;
 802                /*
 803                 * If we're ignore parity and break indicators, ignore 
 804                 * overruns too.  (For real raw support).
 805                 */
 806                if (I_IGNPAR(info->tty))
 807                        info->ignore_status_mask |= UART_LSR_OE;
 808        }
 809        /*
 810         * !!! ignore all characters if CREAD is not set
 811         */
 812        if ((cflag & CREAD) == 0)
 813                info->ignore_status_mask |= UART_LSR_DR;
 814        local_irq_save(flags);
 815
 816        {
 817          short serper;
 818
 819        /* Set up the baud rate */
 820          serper = quot - 1;
 821
 822        /* Enable or disable parity bit */
 823
 824        if(cval & UART_LCR_PARITY)
 825          serper |= (SERPER_PARENB);
 826
 827        custom.serper = serper;
 828        mb();
 829        }
 830
 831        info->LCR = cval;                               /* Save LCR */
 832        local_irq_restore(flags);
 833}
 834
 835static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 836{
 837        struct async_struct *info;
 838        unsigned long flags;
 839
 840        info = tty->driver_data;
 841
 842        if (serial_paranoia_check(info, tty->name, "rs_put_char"))
 843                return 0;
 844
 845        if (!info->xmit.buf)
 846                return 0;
 847
 848        local_irq_save(flags);
 849        if (CIRC_SPACE(info->xmit.head,
 850                       info->xmit.tail,
 851                       SERIAL_XMIT_SIZE) == 0) {
 852                local_irq_restore(flags);
 853                return 0;
 854        }
 855
 856        info->xmit.buf[info->xmit.head++] = ch;
 857        info->xmit.head &= SERIAL_XMIT_SIZE-1;
 858        local_irq_restore(flags);
 859        return 1;
 860}
 861
 862static void rs_flush_chars(struct tty_struct *tty)
 863{
 864        struct async_struct *info = (struct async_struct *)tty->driver_data;
 865        unsigned long flags;
 866
 867        if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 868                return;
 869
 870        if (info->xmit.head == info->xmit.tail
 871            || tty->stopped
 872            || tty->hw_stopped
 873            || !info->xmit.buf)
 874                return;
 875
 876        local_irq_save(flags);
 877        info->IER |= UART_IER_THRI;
 878        custom.intena = IF_SETCLR | IF_TBE;
 879        mb();
 880        /* set a pending Tx Interrupt, transmitter should restart now */
 881        custom.intreq = IF_SETCLR | IF_TBE;
 882        mb();
 883        local_irq_restore(flags);
 884}
 885
 886static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
 887{
 888        int     c, ret = 0;
 889        struct async_struct *info;
 890        unsigned long flags;
 891
 892        info = tty->driver_data;
 893
 894        if (serial_paranoia_check(info, tty->name, "rs_write"))
 895                return 0;
 896
 897        if (!info->xmit.buf)
 898                return 0;
 899
 900        local_irq_save(flags);
 901        while (1) {
 902                c = CIRC_SPACE_TO_END(info->xmit.head,
 903                                      info->xmit.tail,
 904                                      SERIAL_XMIT_SIZE);
 905                if (count < c)
 906                        c = count;
 907                if (c <= 0) {
 908                        break;
 909                }
 910                memcpy(info->xmit.buf + info->xmit.head, buf, c);
 911                info->xmit.head = ((info->xmit.head + c) &
 912                                   (SERIAL_XMIT_SIZE-1));
 913                buf += c;
 914                count -= c;
 915                ret += c;
 916        }
 917        local_irq_restore(flags);
 918
 919        if (info->xmit.head != info->xmit.tail
 920            && !tty->stopped
 921            && !tty->hw_stopped
 922            && !(info->IER & UART_IER_THRI)) {
 923                info->IER |= UART_IER_THRI;
 924                local_irq_disable();
 925                custom.intena = IF_SETCLR | IF_TBE;
 926                mb();
 927                /* set a pending Tx Interrupt, transmitter should restart now */
 928                custom.intreq = IF_SETCLR | IF_TBE;
 929                mb();
 930                local_irq_restore(flags);
 931        }
 932        return ret;
 933}
 934
 935static int rs_write_room(struct tty_struct *tty)
 936{
 937        struct async_struct *info = (struct async_struct *)tty->driver_data;
 938
 939        if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 940                return 0;
 941        return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 942}
 943
 944static int rs_chars_in_buffer(struct tty_struct *tty)
 945{
 946        struct async_struct *info = (struct async_struct *)tty->driver_data;
 947
 948        if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 949                return 0;
 950        return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 951}
 952
 953static void rs_flush_buffer(struct tty_struct *tty)
 954{
 955        struct async_struct *info = (struct async_struct *)tty->driver_data;
 956        unsigned long flags;
 957
 958        if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 959                return;
 960        local_irq_save(flags);
 961        info->xmit.head = info->xmit.tail = 0;
 962        local_irq_restore(flags);
 963        tty_wakeup(tty);
 964}
 965
 966/*
 967 * This function is used to send a high-priority XON/XOFF character to
 968 * the device
 969 */
 970static void rs_send_xchar(struct tty_struct *tty, char ch)
 971{
 972        struct async_struct *info = (struct async_struct *)tty->driver_data;
 973        unsigned long flags;
 974
 975        if (serial_paranoia_check(info, tty->name, "rs_send_char"))
 976                return;
 977
 978        info->x_char = ch;
 979        if (ch) {
 980                /* Make sure transmit interrupts are on */
 981
 982                /* Check this ! */
 983                local_irq_save(flags);
 984                if(!(custom.intenar & IF_TBE)) {
 985                    custom.intena = IF_SETCLR | IF_TBE;
 986                    mb();
 987                    /* set a pending Tx Interrupt, transmitter should restart now */
 988                    custom.intreq = IF_SETCLR | IF_TBE;
 989                    mb();
 990                }
 991                local_irq_restore(flags);
 992
 993                info->IER |= UART_IER_THRI;
 994        }
 995}
 996
 997/*
 998 * ------------------------------------------------------------
 999 * rs_throttle()
1000 * 
1001 * This routine is called by the upper-layer tty layer to signal that
1002 * incoming characters should be throttled.
1003 * ------------------------------------------------------------
1004 */
1005static void rs_throttle(struct tty_struct * tty)
1006{
1007        struct async_struct *info = (struct async_struct *)tty->driver_data;
1008        unsigned long flags;
1009#ifdef SERIAL_DEBUG_THROTTLE
1010        char    buf[64];
1011
1012        printk("throttle %s: %d....\n", tty_name(tty, buf),
1013               tty->ldisc.chars_in_buffer(tty));
1014#endif
1015
1016        if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1017                return;
1018
1019        if (I_IXOFF(tty))
1020                rs_send_xchar(tty, STOP_CHAR(tty));
1021
1022        if (tty->termios->c_cflag & CRTSCTS)
1023                info->MCR &= ~SER_RTS;
1024
1025        local_irq_save(flags);
1026        rtsdtr_ctrl(info->MCR);
1027        local_irq_restore(flags);
1028}
1029
1030static void rs_unthrottle(struct tty_struct * tty)
1031{
1032        struct async_struct *info = (struct async_struct *)tty->driver_data;
1033        unsigned long flags;
1034#ifdef SERIAL_DEBUG_THROTTLE
1035        char    buf[64];
1036
1037        printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1038               tty->ldisc.chars_in_buffer(tty));
1039#endif
1040
1041        if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1042                return;
1043
1044        if (I_IXOFF(tty)) {
1045                if (info->x_char)
1046                        info->x_char = 0;
1047                else
1048                        rs_send_xchar(tty, START_CHAR(tty));
1049        }
1050        if (tty->termios->c_cflag & CRTSCTS)
1051                info->MCR |= SER_RTS;
1052        local_irq_save(flags);
1053        rtsdtr_ctrl(info->MCR);
1054        local_irq_restore(flags);
1055}
1056
1057/*
1058 * ------------------------------------------------------------
1059 * rs_ioctl() and friends
1060 * ------------------------------------------------------------
1061 */
1062
1063static int get_serial_info(struct async_struct * info,
1064                           struct serial_struct __user * retinfo)
1065{
1066        struct serial_struct tmp;
1067        struct serial_state *state = info->state;
1068   
1069        if (!retinfo)
1070                return -EFAULT;
1071        memset(&tmp, 0, sizeof(tmp));
1072        lock_kernel();
1073        tmp.type = state->type;
1074        tmp.line = state->line;
1075        tmp.port = state->port;
1076        tmp.irq = state->irq;
1077        tmp.flags = state->flags;
1078        tmp.xmit_fifo_size = state->xmit_fifo_size;
1079        tmp.baud_base = state->baud_base;
1080        tmp.close_delay = state->close_delay;
1081        tmp.closing_wait = state->closing_wait;
1082        tmp.custom_divisor = state->custom_divisor;
1083        unlock_kernel();
1084        if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1085                return -EFAULT;
1086        return 0;
1087}
1088
1089static int set_serial_info(struct async_struct * info,
1090                           struct serial_struct __user * new_info)
1091{
1092        struct serial_struct new_serial;
1093        struct serial_state old_state, *state;
1094        unsigned int            change_irq,change_port;
1095        int                     retval = 0;
1096
1097        if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1098                return -EFAULT;
1099
1100        lock_kernel();
1101        state = info->state;
1102        old_state = *state;
1103  
1104        change_irq = new_serial.irq != state->irq;
1105        change_port = (new_serial.port != state->port);
1106        if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1107          unlock_kernel();
1108          return -EINVAL;
1109        }
1110  
1111        if (!serial_isroot()) {
1112                if ((new_serial.baud_base != state->baud_base) ||
1113                    (new_serial.close_delay != state->close_delay) ||
1114                    (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1115                    ((new_serial.flags & ~ASYNC_USR_MASK) !=
1116                     (state->flags & ~ASYNC_USR_MASK)))
1117                        return -EPERM;
1118                state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1119                               (new_serial.flags & ASYNC_USR_MASK));
1120                info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1121                               (new_serial.flags & ASYNC_USR_MASK));
1122                state->custom_divisor = new_serial.custom_divisor;
1123                goto check_and_exit;
1124        }
1125
1126        if (new_serial.baud_base < 9600) {
1127                unlock_kernel();
1128                return -EINVAL;
1129        }
1130
1131        /*
1132         * OK, past this point, all the error checking has been done.
1133         * At this point, we start making changes.....
1134         */
1135
1136        state->baud_base = new_serial.baud_base;
1137        state->flags = ((state->flags & ~ASYNC_FLAGS) |
1138                        (new_serial.flags & ASYNC_FLAGS));
1139        info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1140                       (info->flags & ASYNC_INTERNAL_FLAGS));
1141        state->custom_divisor = new_serial.custom_divisor;
1142        state->close_delay = new_serial.close_delay * HZ/100;
1143        state->closing_wait = new_serial.closing_wait * HZ/100;
1144        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1145
1146check_and_exit:
1147        if (info->flags & ASYNC_INITIALIZED) {
1148                if (((old_state.flags & ASYNC_SPD_MASK) !=
1149                     (state->flags & ASYNC_SPD_MASK)) ||
1150                    (old_state.custom_divisor != state->custom_divisor)) {
1151                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1152                                info->tty->alt_speed = 57600;
1153                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1154                                info->tty->alt_speed = 115200;
1155                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1156                                info->tty->alt_speed = 230400;
1157                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1158                                info->tty->alt_speed = 460800;
1159                        change_speed(info, NULL);
1160                }
1161        } else
1162                retval = startup(info);
1163        unlock_kernel();
1164        return retval;
1165}
1166
1167
1168/*
1169 * get_lsr_info - get line status register info
1170 *
1171 * Purpose: Let user call ioctl() to get info when the UART physically
1172 *          is emptied.  On bus types like RS485, the transmitter must
1173 *          release the bus after transmitting. This must be done when
1174 *          the transmit shift register is empty, not be done when the
1175 *          transmit holding register is empty.  This functionality
1176 *          allows an RS485 driver to be written in user space. 
1177 */
1178static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1179{
1180        unsigned char status;
1181        unsigned int result;
1182        unsigned long flags;
1183
1184        local_irq_save(flags);
1185        status = custom.serdatr;
1186        mb();
1187        local_irq_restore(flags);
1188        result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1189        if (copy_to_user(value, &result, sizeof(int)))
1190                return -EFAULT;
1191        return 0;
1192}
1193
1194
1195static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1196{
1197        struct async_struct * info = (struct async_struct *)tty->driver_data;
1198        unsigned char control, status;
1199        unsigned long flags;
1200
1201        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1202                return -ENODEV;
1203        if (tty->flags & (1 << TTY_IO_ERROR))
1204                return -EIO;
1205
1206        control = info->MCR;
1207        local_irq_save(flags);
1208        status = ciab.pra;
1209        local_irq_restore(flags);
1210        return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1211                | ((control & SER_DTR) ? TIOCM_DTR : 0)
1212                | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1213                | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1214                | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1215}
1216
1217static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1218                       unsigned int set, unsigned int clear)
1219{
1220        struct async_struct * info = (struct async_struct *)tty->driver_data;
1221        unsigned long flags;
1222
1223        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1224                return -ENODEV;
1225        if (tty->flags & (1 << TTY_IO_ERROR))
1226                return -EIO;
1227
1228        local_irq_save(flags);
1229        if (set & TIOCM_RTS)
1230                info->MCR |= SER_RTS;
1231        if (set & TIOCM_DTR)
1232                info->MCR |= SER_DTR;
1233        if (clear & TIOCM_RTS)
1234                info->MCR &= ~SER_RTS;
1235        if (clear & TIOCM_DTR)
1236                info->MCR &= ~SER_DTR;
1237        rtsdtr_ctrl(info->MCR);
1238        local_irq_restore(flags);
1239        return 0;
1240}
1241
1242/*
1243 * rs_break() --- routine which turns the break handling on or off
1244 */
1245static int rs_break(struct tty_struct *tty, int break_state)
1246{
1247        struct async_struct * info = (struct async_struct *)tty->driver_data;
1248        unsigned long flags;
1249
1250        if (serial_paranoia_check(info, tty->name, "rs_break"))
1251                return -EINVAL;
1252
1253        local_irq_save(flags);
1254        if (break_state == -1)
1255          custom.adkcon = AC_SETCLR | AC_UARTBRK;
1256        else
1257          custom.adkcon = AC_UARTBRK;
1258        mb();
1259        local_irq_restore(flags);
1260        return 0;
1261}
1262
1263
1264static int rs_ioctl(struct tty_struct *tty, struct file * file,
1265                    unsigned int cmd, unsigned long arg)
1266{
1267        struct async_struct * info = (struct async_struct *)tty->driver_data;
1268        struct async_icount cprev, cnow;        /* kernel counter temps */
1269        struct serial_icounter_struct icount;
1270        void __user *argp = (void __user *)arg;
1271        unsigned long flags;
1272
1273        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1274                return -ENODEV;
1275
1276        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1277            (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1278            (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1279                if (tty->flags & (1 << TTY_IO_ERROR))
1280                    return -EIO;
1281        }
1282
1283        switch (cmd) {
1284                case TIOCGSERIAL:
1285                        return get_serial_info(info, argp);
1286                case TIOCSSERIAL:
1287                        return set_serial_info(info, argp);
1288                case TIOCSERCONFIG:
1289                        return 0;
1290
1291                case TIOCSERGETLSR: /* Get line status register */
1292                        return get_lsr_info(info, argp);
1293
1294                case TIOCSERGSTRUCT:
1295                        if (copy_to_user(argp,
1296                                         info, sizeof(struct async_struct)))
1297                                return -EFAULT;
1298                        return 0;
1299
1300                /*
1301                 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1302                 * - mask passed in arg for lines of interest
1303                 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1304                 * Caller should use TIOCGICOUNT to see which one it was
1305                 */
1306                case TIOCMIWAIT:
1307                        local_irq_save(flags);
1308                        /* note the counters on entry */
1309                        cprev = info->state->icount;
1310                        local_irq_restore(flags);
1311                        while (1) {
1312                                interruptible_sleep_on(&info->delta_msr_wait);
1313                                /* see if a signal did it */
1314                                if (signal_pending(current))
1315                                        return -ERESTARTSYS;
1316                                local_irq_save(flags);
1317                                cnow = info->state->icount; /* atomic copy */
1318                                local_irq_restore(flags);
1319                                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 
1320                                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1321                                        return -EIO; /* no change => error */
1322                                if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1323                                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1324                                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1325                                     ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1326                                        return 0;
1327                                }
1328                                cprev = cnow;
1329                        }
1330                        /* NOTREACHED */
1331
1332                /* 
1333                 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1334                 * Return: write counters to the user passed counter struct
1335                 * NB: both 1->0 and 0->1 transitions are counted except for
1336                 *     RI where only 0->1 is counted.
1337                 */
1338                case TIOCGICOUNT:
1339                        local_irq_save(flags);
1340                        cnow = info->state->icount;
1341                        local_irq_restore(flags);
1342                        icount.cts = cnow.cts;
1343                        icount.dsr = cnow.dsr;
1344                        icount.rng = cnow.rng;
1345                        icount.dcd = cnow.dcd;
1346                        icount.rx = cnow.rx;
1347                        icount.tx = cnow.tx;
1348                        icount.frame = cnow.frame;
1349                        icount.overrun = cnow.overrun;
1350                        icount.parity = cnow.parity;
1351                        icount.brk = cnow.brk;
1352                        icount.buf_overrun = cnow.buf_overrun;
1353
1354                        if (copy_to_user(argp, &icount, sizeof(icount)))
1355                                return -EFAULT;
1356                        return 0;
1357                case TIOCSERGWILD:
1358                case TIOCSERSWILD:
1359                        /* "setserial -W" is called in Debian boot */
1360                        printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1361                        return 0;
1362
1363                default:
1364                        return -ENOIOCTLCMD;
1365                }
1366        return 0;
1367}
1368
1369static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1370{
1371        struct async_struct *info = (struct async_struct *)tty->driver_data;
1372        unsigned long flags;
1373        unsigned int cflag = tty->termios->c_cflag;
1374
1375        change_speed(info, old_termios);
1376
1377        /* Handle transition to B0 status */
1378        if ((old_termios->c_cflag & CBAUD) &&
1379            !(cflag & CBAUD)) {
1380                info->MCR &= ~(SER_DTR|SER_RTS);
1381                local_irq_save(flags);
1382                rtsdtr_ctrl(info->MCR);
1383                local_irq_restore(flags);
1384        }
1385
1386        /* Handle transition away from B0 status */
1387        if (!(old_termios->c_cflag & CBAUD) &&
1388            (cflag & CBAUD)) {
1389                info->MCR |= SER_DTR;
1390                if (!(tty->termios->c_cflag & CRTSCTS) || 
1391                    !test_bit(TTY_THROTTLED, &tty->flags)) {
1392                        info->MCR |= SER_RTS;
1393                }
1394                local_irq_save(flags);
1395                rtsdtr_ctrl(info->MCR);
1396                local_irq_restore(flags);
1397        }
1398
1399        /* Handle turning off CRTSCTS */
1400        if ((old_termios->c_cflag & CRTSCTS) &&
1401            !(tty->termios->c_cflag & CRTSCTS)) {
1402                tty->hw_stopped = 0;
1403                rs_start(tty);
1404        }
1405
1406#if 0
1407        /*
1408         * No need to wake up processes in open wait, since they
1409         * sample the CLOCAL flag once, and don't recheck it.
1410         * XXX  It's not clear whether the current behavior is correct
1411         * or not.  Hence, this may change.....
1412         */
1413        if (!(old_termios->c_cflag & CLOCAL) &&
1414            (tty->termios->c_cflag & CLOCAL))
1415                wake_up_interruptible(&info->open_wait);
1416#endif
1417}
1418
1419/*
1420 * ------------------------------------------------------------
1421 * rs_close()
1422 * 
1423 * This routine is called when the serial port gets closed.  First, we
1424 * wait for the last remaining data to be sent.  Then, we unlink its
1425 * async structure from the interrupt chain if necessary, and we free
1426 * that IRQ if nothing is left in the chain.
1427 * ------------------------------------------------------------
1428 */
1429static void rs_close(struct tty_struct *tty, struct file * filp)
1430{
1431        struct async_struct * info = (struct async_struct *)tty->driver_data;
1432        struct serial_state *state;
1433        unsigned long flags;
1434
1435        if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1436                return;
1437
1438        state = info->state;
1439
1440        local_irq_save(flags);
1441
1442        if (tty_hung_up_p(filp)) {
1443                DBG_CNT("before DEC-hung");
1444                local_irq_restore(flags);
1445                return;
1446        }
1447
1448#ifdef SERIAL_DEBUG_OPEN
1449        printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1450#endif
1451        if ((tty->count == 1) && (state->count != 1)) {
1452                /*
1453                 * Uh, oh.  tty->count is 1, which means that the tty
1454                 * structure will be freed.  state->count should always
1455                 * be one in these conditions.  If it's greater than
1456                 * one, we've got real problems, since it means the
1457                 * serial port won't be shutdown.
1458                 */
1459                printk("rs_close: bad serial port count; tty->count is 1, "
1460                       "state->count is %d\n", state->count);
1461                state->count = 1;
1462        }
1463        if (--state->count < 0) {
1464                printk("rs_close: bad serial port count for ttys%d: %d\n",
1465                       info->line, state->count);
1466                state->count = 0;
1467        }
1468        if (state->count) {
1469                DBG_CNT("before DEC-2");
1470                local_irq_restore(flags);
1471                return;
1472        }
1473        info->flags |= ASYNC_CLOSING;
1474        /*
1475         * Now we wait for the transmit buffer to clear; and we notify 
1476         * the line discipline to only process XON/XOFF characters.
1477         */
1478        tty->closing = 1;
1479        if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1480                tty_wait_until_sent(tty, info->closing_wait);
1481        /*
1482         * At this point we stop accepting input.  To do this, we
1483         * disable the receive line status interrupts, and tell the
1484         * interrupt driver to stop checking the data ready bit in the
1485         * line status register.
1486         */
1487        info->read_status_mask &= ~UART_LSR_DR;
1488        if (info->flags & ASYNC_INITIALIZED) {
1489                /* disable receive interrupts */
1490                custom.intena = IF_RBF;
1491                mb();
1492                /* clear any pending receive interrupt */
1493                custom.intreq = IF_RBF;
1494                mb();
1495
1496                /*
1497                 * Before we drop DTR, make sure the UART transmitter
1498                 * has completely drained; this is especially
1499                 * important if there is a transmit FIFO!
1500                 */
1501                rs_wait_until_sent(tty, info->timeout);
1502        }
1503        shutdown(info);
1504        rs_flush_buffer(tty);
1505                
1506        tty_ldisc_flush(tty);
1507        tty->closing = 0;
1508        info->event = 0;
1509        info->tty = NULL;
1510        if (info->blocked_open) {
1511                if (info->close_delay) {
1512                        msleep_interruptible(jiffies_to_msecs(info->close_delay));
1513                }
1514                wake_up_interruptible(&info->open_wait);
1515        }
1516        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1517        wake_up_interruptible(&info->close_wait);
1518        local_irq_restore(flags);
1519}
1520
1521/*
1522 * rs_wait_until_sent() --- wait until the transmitter is empty
1523 */
1524static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1525{
1526        struct async_struct * info = (struct async_struct *)tty->driver_data;
1527        unsigned long orig_jiffies, char_time;
1528        int lsr;
1529
1530        if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1531                return;
1532
1533        if (info->xmit_fifo_size == 0)
1534                return; /* Just in case.... */
1535
1536        orig_jiffies = jiffies;
1537
1538        lock_kernel();
1539        /*
1540         * Set the check interval to be 1/5 of the estimated time to
1541         * send a single character, and make it at least 1.  The check
1542         * interval should also be less than the timeout.
1543         * 
1544         * Note: we have to use pretty tight timings here to satisfy
1545         * the NIST-PCTS.
1546         */
1547        char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1548        char_time = char_time / 5;
1549        if (char_time == 0)
1550                char_time = 1;
1551        if (timeout)
1552          char_time = min_t(unsigned long, char_time, timeout);
1553        /*
1554         * If the transmitter hasn't cleared in twice the approximate
1555         * amount of time to send the entire FIFO, it probably won't
1556         * ever clear.  This assumes the UART isn't doing flow
1557         * control, which is currently the case.  Hence, if it ever
1558         * takes longer than info->timeout, this is probably due to a
1559         * UART bug of some kind.  So, we clamp the timeout parameter at
1560         * 2*info->timeout.
1561         */
1562        if (!timeout || timeout > 2*info->timeout)
1563                timeout = 2*info->timeout;
1564#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1565        printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1566        printk("jiff=%lu...", jiffies);
1567#endif
1568        while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1569#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1570                printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1571#endif
1572                msleep_interruptible(jiffies_to_msecs(char_time));
1573                if (signal_pending(current))
1574                        break;
1575                if (timeout && time_after(jiffies, orig_jiffies + timeout))
1576                        break;
1577        }
1578        __set_current_state(TASK_RUNNING);
1579        unlock_kernel();
1580#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1581        printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1582#endif
1583}
1584
1585/*
1586 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1587 */
1588static void rs_hangup(struct tty_struct *tty)
1589{
1590        struct async_struct * info = (struct async_struct *)tty->driver_data;
1591        struct serial_state *state = info->state;
1592
1593        if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1594                return;
1595
1596        state = info->state;
1597
1598        rs_flush_buffer(tty);
1599        shutdown(info);
1600        info->event = 0;
1601        state->count = 0;
1602        info->flags &= ~ASYNC_NORMAL_ACTIVE;
1603        info->tty = NULL;
1604        wake_up_interruptible(&info->open_wait);
1605}
1606
1607/*
1608 * ------------------------------------------------------------
1609 * rs_open() and friends
1610 * ------------------------------------------------------------
1611 */
1612static int block_til_ready(struct tty_struct *tty, struct file * filp,
1613                           struct async_struct *info)
1614{
1615#ifdef DECLARE_WAITQUEUE
1616        DECLARE_WAITQUEUE(wait, current);
1617#else
1618        struct wait_queue wait = { current, NULL };
1619#endif
1620        struct serial_state *state = info->state;
1621        int             retval;
1622        int             do_clocal = 0, extra_count = 0;
1623        unsigned long   flags;
1624
1625        /*
1626         * If the device is in the middle of being closed, then block
1627         * until it's done, and then try again.
1628         */
1629        if (tty_hung_up_p(filp) ||
1630            (info->flags & ASYNC_CLOSING)) {
1631                if (info->flags & ASYNC_CLOSING)
1632                        interruptible_sleep_on(&info->close_wait);
1633#ifdef SERIAL_DO_RESTART
1634                return ((info->flags & ASYNC_HUP_NOTIFY) ?
1635                        -EAGAIN : -ERESTARTSYS);
1636#else
1637                return -EAGAIN;
1638#endif
1639        }
1640
1641        /*
1642         * If non-blocking mode is set, or the port is not enabled,
1643         * then make the check up front and then exit.
1644         */
1645        if ((filp->f_flags & O_NONBLOCK) ||
1646            (tty->flags & (1 << TTY_IO_ERROR))) {
1647                info->flags |= ASYNC_NORMAL_ACTIVE;
1648                return 0;
1649        }
1650
1651        if (tty->termios->c_cflag & CLOCAL)
1652                do_clocal = 1;
1653
1654        /*
1655         * Block waiting for the carrier detect and the line to become
1656         * free (i.e., not in use by the callout).  While we are in
1657         * this loop, state->count is dropped by one, so that
1658         * rs_close() knows when to free things.  We restore it upon
1659         * exit, either normal or abnormal.
1660         */
1661        retval = 0;
1662        add_wait_queue(&info->open_wait, &wait);
1663#ifdef SERIAL_DEBUG_OPEN
1664        printk("block_til_ready before block: ttys%d, count = %d\n",
1665               state->line, state->count);
1666#endif
1667        local_irq_save(flags);
1668        if (!tty_hung_up_p(filp)) {
1669                extra_count = 1;
1670                state->count--;
1671        }
1672        local_irq_restore(flags);
1673        info->blocked_open++;
1674        while (1) {
1675                local_irq_save(flags);
1676                if (tty->termios->c_cflag & CBAUD)
1677                        rtsdtr_ctrl(SER_DTR|SER_RTS);
1678                local_irq_restore(flags);
1679                set_current_state(TASK_INTERRUPTIBLE);
1680                if (tty_hung_up_p(filp) ||
1681                    !(info->flags & ASYNC_INITIALIZED)) {
1682#ifdef SERIAL_DO_RESTART
1683                        if (info->flags & ASYNC_HUP_NOTIFY)
1684                                retval = -EAGAIN;
1685                        else
1686                                retval = -ERESTARTSYS;
1687#else
1688                        retval = -EAGAIN;
1689#endif
1690                        break;
1691                }
1692                if (!(info->flags & ASYNC_CLOSING) &&
1693                    (do_clocal || (!(ciab.pra & SER_DCD)) ))
1694                        break;
1695                if (signal_pending(current)) {
1696                        retval = -ERESTARTSYS;
1697                        break;
1698                }
1699#ifdef SERIAL_DEBUG_OPEN
1700                printk("block_til_ready blocking: ttys%d, count = %d\n",
1701                       info->line, state->count);
1702#endif
1703                schedule();
1704        }
1705        __set_current_state(TASK_RUNNING);
1706        remove_wait_queue(&info->open_wait, &wait);
1707        if (extra_count)
1708                state->count++;
1709        info->blocked_open--;
1710#ifdef SERIAL_DEBUG_OPEN
1711        printk("block_til_ready after blocking: ttys%d, count = %d\n",
1712               info->line, state->count);
1713#endif
1714        if (retval)
1715                return retval;
1716        info->flags |= ASYNC_NORMAL_ACTIVE;
1717        return 0;
1718}
1719
1720static int get_async_struct(int line, struct async_struct **ret_info)
1721{
1722        struct async_struct *info;
1723        struct serial_state *sstate;
1724
1725        sstate = rs_table + line;
1726        sstate->count++;
1727        if (sstate->info) {
1728                *ret_info = sstate->info;
1729                return 0;
1730        }
1731        info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1732        if (!info) {
1733                sstate->count--;
1734                return -ENOMEM;
1735        }
1736#ifdef DECLARE_WAITQUEUE
1737        init_waitqueue_head(&info->open_wait);
1738        init_waitqueue_head(&info->close_wait);
1739        init_waitqueue_head(&info->delta_msr_wait);
1740#endif
1741        info->magic = SERIAL_MAGIC;
1742        info->port = sstate->port;
1743        info->flags = sstate->flags;
1744        info->xmit_fifo_size = sstate->xmit_fifo_size;
1745        info->line = line;
1746        tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1747        info->state = sstate;
1748        if (sstate->info) {
1749                kfree(info);
1750                *ret_info = sstate->info;
1751                return 0;
1752        }
1753        *ret_info = sstate->info = info;
1754        return 0;
1755}
1756
1757/*
1758 * This routine is called whenever a serial port is opened.  It
1759 * enables interrupts for a serial port, linking in its async structure into
1760 * the IRQ chain.   It also performs the serial-specific
1761 * initialization for the tty structure.
1762 */
1763static int rs_open(struct tty_struct *tty, struct file * filp)
1764{
1765        struct async_struct     *info;
1766        int                     retval, line;
1767
1768        line = tty->index;
1769        if ((line < 0) || (line >= NR_PORTS)) {
1770                return -ENODEV;
1771        }
1772        retval = get_async_struct(line, &info);
1773        if (retval) {
1774                return retval;
1775        }
1776        tty->driver_data = info;
1777        info->tty = tty;
1778        if (serial_paranoia_check(info, tty->name, "rs_open"))
1779                return -ENODEV;
1780
1781#ifdef SERIAL_DEBUG_OPEN
1782        printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1783#endif
1784        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1785
1786        /*
1787         * If the port is the middle of closing, bail out now
1788         */
1789        if (tty_hung_up_p(filp) ||
1790            (info->flags & ASYNC_CLOSING)) {
1791                if (info->flags & ASYNC_CLOSING)
1792                        interruptible_sleep_on(&info->close_wait);
1793#ifdef SERIAL_DO_RESTART
1794                return ((info->flags & ASYNC_HUP_NOTIFY) ?
1795                        -EAGAIN : -ERESTARTSYS);
1796#else
1797                return -EAGAIN;
1798#endif
1799        }
1800
1801        /*
1802         * Start up serial port
1803         */
1804        retval = startup(info);
1805        if (retval) {
1806                return retval;
1807        }
1808
1809        retval = block_til_ready(tty, filp, info);
1810        if (retval) {
1811#ifdef SERIAL_DEBUG_OPEN
1812                printk("rs_open returning after block_til_ready with %d\n",
1813                       retval);
1814#endif
1815                return retval;
1816        }
1817
1818#ifdef SERIAL_DEBUG_OPEN
1819        printk("rs_open %s successful...", tty->name);
1820#endif
1821        return 0;
1822}
1823
1824/*
1825 * /proc fs routines....
1826 */
1827
1828static inline int line_info(char *buf, struct serial_state *state)
1829{
1830        struct async_struct *info = state->info, scr_info;
1831        char    stat_buf[30], control, status;
1832        int     ret;
1833        unsigned long flags;
1834
1835        ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1836
1837        /*
1838         * Figure out the current RS-232 lines
1839         */
1840        if (!info) {
1841                info = &scr_info;       /* This is just for serial_{in,out} */
1842
1843                info->magic = SERIAL_MAGIC;
1844                info->flags = state->flags;
1845                info->quot = 0;
1846                info->tty = NULL;
1847        }
1848        local_irq_save(flags);
1849        status = ciab.pra;
1850        control = info ? info->MCR : status;
1851        local_irq_restore(flags);
1852
1853        stat_buf[0] = 0;
1854        stat_buf[1] = 0;
1855        if(!(control & SER_RTS))
1856                strcat(stat_buf, "|RTS");
1857        if(!(status & SER_CTS))
1858                strcat(stat_buf, "|CTS");
1859        if(!(control & SER_DTR))
1860                strcat(stat_buf, "|DTR");
1861        if(!(status & SER_DSR))
1862                strcat(stat_buf, "|DSR");
1863        if(!(status & SER_DCD))
1864                strcat(stat_buf, "|CD");
1865
1866        if (info->quot) {
1867                ret += sprintf(buf+ret, " baud:%d",
1868                               state->baud_base / info->quot);
1869        }
1870
1871        ret += sprintf(buf+ret, " tx:%d rx:%d",
1872                      state->icount.tx, state->icount.rx);
1873
1874        if (state->icount.frame)
1875                ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1876
1877        if (state->icount.parity)
1878                ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1879
1880        if (state->icount.brk)
1881                ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1882
1883        if (state->icount.overrun)
1884                ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1885
1886        /*
1887         * Last thing is the RS-232 status lines
1888         */
1889        ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1890        return ret;
1891}
1892
1893static int rs_read_proc(char *page, char **start, off_t off, int count,
1894                        int *eof, void *data)
1895{
1896        int len = 0, l;
1897        off_t   begin = 0;
1898
1899        len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1900        l = line_info(page + len, &rs_table[0]);
1901        len += l;
1902        if (len+begin > off+count)
1903          goto done;
1904        if (len+begin < off) {
1905          begin += len;
1906          len = 0;
1907        }
1908        *eof = 1;
1909done:
1910        if (off >= len+begin)
1911                return 0;
1912        *start = page + (off-begin);
1913        return ((count < begin+len-off) ? count : begin+len-off);
1914}
1915
1916/*
1917 * ---------------------------------------------------------------------
1918 * rs_init() and friends
1919 *
1920 * rs_init() is called at boot-time to initialize the serial driver.
1921 * ---------------------------------------------------------------------
1922 */
1923
1924/*
1925 * This routine prints out the appropriate serial driver version
1926 * number, and identifies which options were configured into this
1927 * driver.
1928 */
1929static void show_serial_version(void)
1930{
1931        printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1932}
1933
1934
1935static const struct tty_operations serial_ops = {
1936        .open = rs_open,
1937        .close = rs_close,
1938        .write = rs_write,
1939        .put_char = rs_put_char,
1940        .flush_chars = rs_flush_chars,
1941        .write_room = rs_write_room,
1942        .chars_in_buffer = rs_chars_in_buffer,
1943        .flush_buffer = rs_flush_buffer,
1944        .ioctl = rs_ioctl,
1945        .throttle = rs_throttle,
1946        .unthrottle = rs_unthrottle,
1947        .set_termios = rs_set_termios,
1948        .stop = rs_stop,
1949        .start = rs_start,
1950        .hangup = rs_hangup,
1951        .break_ctl = rs_break,
1952        .send_xchar = rs_send_xchar,
1953        .wait_until_sent = rs_wait_until_sent,
1954        .read_proc = rs_read_proc,
1955        .tiocmget = rs_tiocmget,
1956        .tiocmset = rs_tiocmset,
1957};
1958
1959/*
1960 * The serial driver boot-time initialization code!
1961 */
1962static int __init rs_init(void)
1963{
1964        unsigned long flags;
1965        struct serial_state * state;
1966
1967        if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1968                return -ENODEV;
1969
1970        serial_driver = alloc_tty_driver(1);
1971        if (!serial_driver)
1972                return -ENOMEM;
1973
1974        /*
1975         *  We request SERDAT and SERPER only, because the serial registers are
1976         *  too spreaded over the custom register space
1977         */
1978        if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
1979                return -EBUSY;
1980
1981        IRQ_ports = NULL;
1982
1983        show_serial_version();
1984
1985        /* Initialize the tty_driver structure */
1986
1987        serial_driver->owner = THIS_MODULE;
1988        serial_driver->driver_name = "amiserial";
1989        serial_driver->name = "ttyS";
1990        serial_driver->major = TTY_MAJOR;
1991        serial_driver->minor_start = 64;
1992        serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1993        serial_driver->subtype = SERIAL_TYPE_NORMAL;
1994        serial_driver->init_termios = tty_std_termios;
1995        serial_driver->init_termios.c_cflag =
1996                B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1997        serial_driver->flags = TTY_DRIVER_REAL_RAW;
1998        tty_set_operations(serial_driver, &serial_ops);
1999
2000        if (tty_register_driver(serial_driver))
2001                panic("Couldn't register serial driver\n");
2002
2003        state = rs_table;
2004        state->magic = SSTATE_MAGIC;
2005        state->port = (int)&custom.serdatr; /* Just to give it a value */
2006        state->line = 0;
2007        state->custom_divisor = 0;
2008        state->close_delay = 5*HZ/10;
2009        state->closing_wait = 30*HZ;
2010        state->icount.cts = state->icount.dsr = 
2011          state->icount.rng = state->icount.dcd = 0;
2012        state->icount.rx = state->icount.tx = 0;
2013        state->icount.frame = state->icount.parity = 0;
2014        state->icount.overrun = state->icount.brk = 0;
2015
2016        printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2017                       state->line);
2018
2019        /* Hardware set up */
2020
2021        state->baud_base = amiga_colorclock;
2022        state->xmit_fifo_size = 1;
2023
2024        local_irq_save(flags);
2025
2026        /* set ISRs, and then disable the rx interrupts */
2027        request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2028        request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
2029
2030        /* turn off Rx and Tx interrupts */
2031        custom.intena = IF_RBF | IF_TBE;
2032        mb();
2033
2034        /* clear any pending interrupt */
2035        custom.intreq = IF_RBF | IF_TBE;
2036        mb();
2037
2038        local_irq_restore(flags);
2039
2040        /*
2041         * set the appropriate directions for the modem control flags,
2042         * and clear RTS and DTR
2043         */
2044        ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
2045        ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
2046
2047        return 0;
2048}
2049
2050static __exit void rs_exit(void) 
2051{
2052        int error;
2053        struct async_struct *info = rs_table[0].info;
2054
2055        /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2056        tasklet_kill(&info->tlet);
2057        if ((error = tty_unregister_driver(serial_driver)))
2058                printk("SERIAL: failed to unregister serial driver (%d)\n",
2059                       error);
2060        put_tty_driver(serial_driver);
2061
2062        if (info) {
2063          rs_table[0].info = NULL;
2064          kfree(info);
2065        }
2066
2067        release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2068}
2069
2070module_init(rs_init)
2071module_exit(rs_exit)
2072
2073
2074#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2075
2076/*
2077 * ------------------------------------------------------------
2078 * Serial console driver
2079 * ------------------------------------------------------------
2080 */
2081
2082static void amiga_serial_putc(char c)
2083{
2084        custom.serdat = (unsigned char)c | 0x100;
2085        while (!(custom.serdatr & 0x2000))
2086                barrier();
2087}
2088
2089/*
2090 *      Print a string to the serial port trying not to disturb
2091 *      any possible real use of the port...
2092 *
2093 *      The console must be locked when we get here.
2094 */
2095static void serial_console_write(struct console *co, const char *s,
2096                                unsigned count)
2097{
2098        unsigned short intena = custom.intenar;
2099
2100        custom.intena = IF_TBE;
2101
2102        while (count--) {
2103                if (*s == '\n')
2104                        amiga_serial_putc('\r');
2105                amiga_serial_putc(*s++);
2106        }
2107
2108        custom.intena = IF_SETCLR | (intena & IF_TBE);
2109}
2110
2111static struct tty_driver *serial_console_device(struct console *c, int *index)
2112{
2113        *index = 0;
2114        return serial_driver;
2115}
2116
2117static struct console sercons = {
2118        .name =         "ttyS",
2119        .write =        serial_console_write,
2120        .device =       serial_console_device,
2121        .flags =        CON_PRINTBUFFER,
2122        .index =        -1,
2123};
2124
2125/*
2126 *      Register console.
2127 */
2128static int __init amiserial_console_init(void)
2129{
2130        register_console(&sercons);
2131        return 0;
2132}
2133console_initcall(amiserial_console_init);
2134
2135#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
2136
2137MODULE_LICENSE("GPL");
2138
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