drivers/tty/amiserial.c

   1 /*
   2  * Serial driver for the amiga builtin port.
   3  *
   4  * This code was created by taking serial.c version 4.30 from kernel
   5  * release 2.3.22, replacing all hardware related stuff with the
   6  * corresponding amiga hardware actions, and removing all irrelevant
   7  * code. As a consequence, it uses many of the constants and names
   8  * associated with the registers and bits of 16550 compatible UARTS -
   9  * but only to keep track of status, etc in the state variables. It
  10  * was done this was to make it easier to keep the code in line with
  11  * (non hardware specific) changes to serial.c.
  12  *
  13  * The port is registered with the tty driver as minor device 64, and
  14  * therefore other ports should should only use 65 upwards.
  15  *
  16  * Richard Lucock 28/12/99
  17  *
  18  *  Copyright (C) 1991, 1992  Linus Torvalds
  19  *  Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
  20  *              1998, 1999  Theodore Ts'o
  21  *
  22  */
  23
  24 /*
  25  * Serial driver configuration section.  Here are the various options:
  26  *
  27  * SERIAL_PARANOIA_CHECK
  28  *              Check the magic number for the async_structure where
  29  *              ever possible.
  30  */
  31
  32 #include <linux/delay.h>
  33
  34 #undef SERIAL_PARANOIA_CHECK
  35
  36 /* Set of debugging defines */
  37
  38 #undef SERIAL_DEBUG_INTR
  39 #undef SERIAL_DEBUG_OPEN
  40 #undef SERIAL_DEBUG_FLOW
  41 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
  42
  43 /* Sanity checks */
  44
  45 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
  46 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
  47  tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
  48 #else
  49 #define DBG_CNT(s)
  50 #endif
  51
  52 /*
  53  * End of serial driver configuration section.
  54  */
  55
  56 #include <linux/module.h>
  57
  58 #include <linux/types.h>
  59 #include <linux/serial.h>
  60 #include <linux/serial_reg.h>
  61 static char *serial_version = "4.30";
  62
  63 #include <linux/errno.h>
  64 #include <linux/signal.h>
  65 #include <linux/sched.h>
  66 #include <linux/kernel.h>
  67 #include <linux/timer.h>
  68 #include <linux/interrupt.h>
  69 #include <linux/tty.h>
  70 #include <linux/tty_flip.h>
  71 #include <linux/circ_buf.h>
  72 #include <linux/console.h>
  73 #include <linux/major.h>
  74 #include <linux/string.h>
  75 #include <linux/fcntl.h>
  76 #include <linux/ptrace.h>
  77 #include <linux/ioport.h>
  78 #include <linux/mm.h>
  79 #include <linux/seq_file.h>
  80 #include <linux/slab.h>
  81 #include <linux/init.h>
  82 #include <linux/bitops.h>
  83 #include <linux/platform_device.h>
  84
  85 #include <asm/setup.h>
  86
  87
  88 #include <asm/irq.h>
  89
  90 #include <asm/amigahw.h>
  91 #include <asm/amigaints.h>
  92
  93 struct serial_state {
  94         struct tty_port         tport;
  95         struct circ_buf         xmit;
  96         struct async_icount     icount;
  97
  98         unsigned long           port;
  99         int                     baud_base;
 100         int                     xmit_fifo_size;
 101         int                     custom_divisor;
 102         int                     read_status_mask;
 103         int                     ignore_status_mask;
 104         int                     timeout;
 105         int                     quot;
 106         int                     IER;    /* Interrupt Enable Register */
 107         int                     MCR;    /* Modem control register */
 108         int                     x_char; /* xon/xoff character */
 109 };
 110
 111 #define custom amiga_custom
 112 static char *serial_name = "Amiga-builtin serial driver";
 113
 114 static struct tty_driver *serial_driver;
 115
 116 /* number of characters left in xmit buffer before we ask for more */
 117 #define WAKEUP_CHARS 256
 118
 119 static unsigned char current_ctl_bits;
 120
 121 static void change_speed(struct tty_struct *tty, struct serial_state *info,
 122                 struct ktermios *old);
 123 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
 124
 125
 126 static struct serial_state rs_table[1];
 127
 128 #define NR_PORTS ARRAY_SIZE(rs_table)
 129
 130 #include <asm/uaccess.h>
 131
 132 #define serial_isroot() (capable(CAP_SYS_ADMIN))
 133
 134
 135 static inline int serial_paranoia_check(struct serial_state *info,
 136                                         char *name, const char *routine)
 137 {
 138 #ifdef SERIAL_PARANOIA_CHECK
 139         static const char *badmagic =
 140                 "Warning: bad magic number for serial struct (%s) in %s\n";
 141         static const char *badinfo =
 142                 "Warning: null async_struct for (%s) in %s\n";
 143
 144         if (!info) {
 145                 printk(badinfo, name, routine);
 146                 return 1;
 147         }
 148         if (info->magic != SERIAL_MAGIC) {
 149                 printk(badmagic, name, routine);
 150                 return 1;
 151         }
 152 #endif
 153         return 0;
 154 }
 155
 156 /* some serial hardware definitions */
 157 #define SDR_OVRUN   (1<<15)
 158 #define SDR_RBF     (1<<14)
 159 #define SDR_TBE     (1<<13)
 160 #define SDR_TSRE    (1<<12)
 161
 162 #define SERPER_PARENB    (1<<15)
 163
 164 #define AC_SETCLR   (1<<15)
 165 #define AC_UARTBRK  (1<<11)
 166
 167 #define SER_DTR     (1<<7)
 168 #define SER_RTS     (1<<6)
 169 #define SER_DCD     (1<<5)
 170 #define SER_CTS     (1<<4)
 171 #define SER_DSR     (1<<3)
 172
 173 static __inline__ void rtsdtr_ctrl(int bits)
 174 {
 175     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
 176 }
 177
 178 /*
 179  * ------------------------------------------------------------
 180  * rs_stop() and rs_start()
 181  *
 182  * This routines are called before setting or resetting tty->stopped.
 183  * They enable or disable transmitter interrupts, as necessary.
 184  * ------------------------------------------------------------
 185  */
 186 static void rs_stop(struct tty_struct *tty)
 187 {
 188         struct serial_state *info = tty->driver_data;
 189         unsigned long flags;
 190
 191         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 192                 return;
 193
 194         local_irq_save(flags);
 195         if (info->IER & UART_IER_THRI) {
 196                 info->IER &= ~UART_IER_THRI;
 197                 /* disable Tx interrupt and remove any pending interrupts */
 198                 custom.intena = IF_TBE;
 199                 mb();
 200                 custom.intreq = IF_TBE;
 201                 mb();
 202         }
 203         local_irq_restore(flags);
 204 }
 205
 206 static void rs_start(struct tty_struct *tty)
 207 {
 208         struct serial_state *info = tty->driver_data;
 209         unsigned long flags;
 210
 211         if (serial_paranoia_check(info, tty->name, "rs_start"))
 212                 return;
 213
 214         local_irq_save(flags);
 215         if (info->xmit.head != info->xmit.tail
 216             && info->xmit.buf
 217             && !(info->IER & UART_IER_THRI)) {
 218                 info->IER |= UART_IER_THRI;
 219                 custom.intena = IF_SETCLR | IF_TBE;
 220                 mb();
 221                 /* set a pending Tx Interrupt, transmitter should restart now */
 222                 custom.intreq = IF_SETCLR | IF_TBE;
 223                 mb();
 224         }
 225         local_irq_restore(flags);
 226 }
 227
 228 /*
 229  * ----------------------------------------------------------------------
 230  *
 231  * Here starts the interrupt handling routines.  All of the following
 232  * subroutines are declared as inline and are folded into
 233  * rs_interrupt().  They were separated out for readability's sake.
 234  *
 235  * Note: rs_interrupt() is a "fast" interrupt, which means that it
 236  * runs with interrupts turned off.  People who may want to modify
 237  * rs_interrupt() should try to keep the interrupt handler as fast as
 238  * possible.  After you are done making modifications, it is not a bad
 239  * idea to do:
 240  *
 241  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 242  *
 243  * and look at the resulting assemble code in serial.s.
 244  *
 245  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
 246  * -----------------------------------------------------------------------
 247  */
 248
 249 static void receive_chars(struct serial_state *info)
 250 {
 251         int status;
 252         int serdatr;
 253         unsigned char ch, flag;
 254         struct  async_icount *icount;
 255         int oe = 0;
 256
 257         icount = &info->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->tport.flags & ASYNC_SAK)
 315               do_SAK(info->tport.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(&info->tport, ch, flag);
 330         if (oe == 1)
 331                 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
 332         tty_flip_buffer_push(&info->tport);
 333 out:
 334         return;
 335 }
 336
 337 static void transmit_chars(struct serial_state *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->icount.tx++;
 345                 info->x_char = 0;
 346                 return;
 347         }
 348         if (info->xmit.head == info->xmit.tail
 349             || info->tport.tty->stopped
 350             || info->tport.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->icount.tx++;
 361
 362         if (CIRC_CNT(info->xmit.head,
 363                      info->xmit.tail,
 364                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
 365                 tty_wakeup(info->tport.tty);
 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 serial_state *info)
 378 {
 379         struct tty_port *port = &info->tport;
 380         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 381         unsigned char dstatus;
 382         struct  async_icount *icount;
 383
 384         /* Determine bits that have changed */
 385         dstatus = status ^ current_ctl_bits;
 386         current_ctl_bits = status;
 387
 388         if (dstatus) {
 389                 icount = &info->icount;
 390                 /* update input line counters */
 391                 if (dstatus & SER_DSR)
 392                         icount->dsr++;
 393                 if (dstatus & SER_DCD) {
 394                         icount->dcd++;
 395                 }
 396                 if (dstatus & SER_CTS)
 397                         icount->cts++;
 398                 wake_up_interruptible(&port->delta_msr_wait);
 399         }
 400
 401         if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
 402 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
 403                 printk("ttyS%d CD now %s...", info->line,
 404                        (!(status & SER_DCD)) ? "on" : "off");
 405 #endif
 406                 if (!(status & SER_DCD))
 407                         wake_up_interruptible(&port->open_wait);
 408                 else {
 409 #ifdef SERIAL_DEBUG_OPEN
 410                         printk("doing serial hangup...");
 411 #endif
 412                         if (port->tty)
 413                                 tty_hangup(port->tty);
 414                 }
 415         }
 416         if (tty_port_cts_enabled(port)) {
 417                 if (port->tty->hw_stopped) {
 418                         if (!(status & SER_CTS)) {
 419 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 420                                 printk("CTS tx start...");
 421 #endif
 422                                 port->tty->hw_stopped = 0;
 423                                 info->IER |= UART_IER_THRI;
 424                                 custom.intena = IF_SETCLR | IF_TBE;
 425                                 mb();
 426                                 /* set a pending Tx Interrupt, transmitter should restart now */
 427                                 custom.intreq = IF_SETCLR | IF_TBE;
 428                                 mb();
 429                                 tty_wakeup(port->tty);
 430                                 return;
 431                         }
 432                 } else {
 433                         if ((status & SER_CTS)) {
 434 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 435                                 printk("CTS tx stop...");
 436 #endif
 437                                 port->tty->hw_stopped = 1;
 438                                 info->IER &= ~UART_IER_THRI;
 439                                 /* disable Tx interrupt and remove any pending interrupts */
 440                                 custom.intena = IF_TBE;
 441                                 mb();
 442                                 custom.intreq = IF_TBE;
 443                                 mb();
 444                         }
 445                 }
 446         }
 447 }
 448
 449 static irqreturn_t ser_vbl_int( int irq, void *data)
 450 {
 451         /* vbl is just a periodic interrupt we tie into to update modem status */
 452         struct serial_state *info = data;
 453         /*
 454          * TBD - is it better to unregister from this interrupt or to
 455          * ignore it if MSI is clear ?
 456          */
 457         if(info->IER & UART_IER_MSI)
 458           check_modem_status(info);
 459         return IRQ_HANDLED;
 460 }
 461
 462 static irqreturn_t ser_rx_int(int irq, void *dev_id)
 463 {
 464         struct serial_state *info = dev_id;
 465
 466 #ifdef SERIAL_DEBUG_INTR
 467         printk("ser_rx_int...");
 468 #endif
 469
 470         if (!info->tport.tty)
 471                 return IRQ_NONE;
 472
 473         receive_chars(info);
 474 #ifdef SERIAL_DEBUG_INTR
 475         printk("end.\n");
 476 #endif
 477         return IRQ_HANDLED;
 478 }
 479
 480 static irqreturn_t ser_tx_int(int irq, void *dev_id)
 481 {
 482         struct serial_state *info = dev_id;
 483
 484         if (custom.serdatr & SDR_TBE) {
 485 #ifdef SERIAL_DEBUG_INTR
 486           printk("ser_tx_int...");
 487 #endif
 488
 489           if (!info->tport.tty)
 490                 return IRQ_NONE;
 491
 492           transmit_chars(info);
 493 #ifdef SERIAL_DEBUG_INTR
 494           printk("end.\n");
 495 #endif
 496         }
 497         return IRQ_HANDLED;
 498 }
 499
 500 /*
 501  * -------------------------------------------------------------------
 502  * Here ends the serial interrupt routines.
 503  * -------------------------------------------------------------------
 504  */
 505
 506 /*
 507  * ---------------------------------------------------------------
 508  * Low level utility subroutines for the serial driver:  routines to
 509  * figure out the appropriate timeout for an interrupt chain, routines
 510  * to initialize and startup a serial port, and routines to shutdown a
 511  * serial port.  Useful stuff like that.
 512  * ---------------------------------------------------------------
 513  */
 514
 515 static int startup(struct tty_struct *tty, struct serial_state *info)
 516 {
 517         struct tty_port *port = &info->tport;
 518         unsigned long flags;
 519         int     retval=0;
 520         unsigned long page;
 521
 522         page = get_zeroed_page(GFP_KERNEL);
 523         if (!page)
 524                 return -ENOMEM;
 525
 526         local_irq_save(flags);
 527
 528         if (port->flags & ASYNC_INITIALIZED) {
 529                 free_page(page);
 530                 goto errout;
 531         }
 532
 533         if (info->xmit.buf)
 534                 free_page(page);
 535         else
 536                 info->xmit.buf = (unsigned char *) page;
 537
 538 #ifdef SERIAL_DEBUG_OPEN
 539         printk("starting up ttys%d ...", info->line);
 540 #endif
 541
 542         /* Clear anything in the input buffer */
 543
 544         custom.intreq = IF_RBF;
 545         mb();
 546
 547         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
 548         if (retval) {
 549           if (serial_isroot()) {
 550               set_bit(TTY_IO_ERROR, &tty->flags);
 551             retval = 0;
 552           }
 553           goto errout;
 554         }
 555
 556         /* enable both Rx and Tx interrupts */
 557         custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
 558         mb();
 559         info->IER = UART_IER_MSI;
 560
 561         /* remember current state of the DCD and CTS bits */
 562         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 563
 564         info->MCR = 0;
 565         if (C_BAUD(tty))
 566           info->MCR = SER_DTR | SER_RTS;
 567         rtsdtr_ctrl(info->MCR);
 568
 569         clear_bit(TTY_IO_ERROR, &tty->flags);
 570         info->xmit.head = info->xmit.tail = 0;
 571
 572         /*
 573          * Set up the tty->alt_speed kludge
 574          */
 575         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 576                 tty->alt_speed = 57600;
 577         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 578                 tty->alt_speed = 115200;
 579         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 580                 tty->alt_speed = 230400;
 581         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 582                 tty->alt_speed = 460800;
 583
 584         /*
 585          * and set the speed of the serial port
 586          */
 587         change_speed(tty, info, NULL);
 588
 589         port->flags |= ASYNC_INITIALIZED;
 590         local_irq_restore(flags);
 591         return 0;
 592
 593 errout:
 594         local_irq_restore(flags);
 595         return retval;
 596 }
 597
 598 /*
 599  * This routine will shutdown a serial port; interrupts are disabled, and
 600  * DTR is dropped if the hangup on close termio flag is on.
 601  */
 602 static void shutdown(struct tty_struct *tty, struct serial_state *info)
 603 {
 604         unsigned long   flags;
 605         struct serial_state *state;
 606
 607         if (!(info->tport.flags & ASYNC_INITIALIZED))
 608                 return;
 609
 610         state = info;
 611
 612 #ifdef SERIAL_DEBUG_OPEN
 613         printk("Shutting down serial port %d ....\n", info->line);
 614 #endif
 615
 616         local_irq_save(flags); /* Disable interrupts */
 617
 618         /*
 619          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 620          * here so the queue might never be waken up
 621          */
 622         wake_up_interruptible(&info->tport.delta_msr_wait);
 623
 624         /*
 625          * Free the IRQ, if necessary
 626          */
 627         free_irq(IRQ_AMIGA_VERTB, info);
 628
 629         if (info->xmit.buf) {
 630                 free_page((unsigned long) info->xmit.buf);
 631                 info->xmit.buf = NULL;
 632         }
 633
 634         info->IER = 0;
 635         custom.intena = IF_RBF | IF_TBE;
 636         mb();
 637
 638         /* disable break condition */
 639         custom.adkcon = AC_UARTBRK;
 640         mb();
 641
 642         if (C_HUPCL(tty))
 643                 info->MCR &= ~(SER_DTR|SER_RTS);
 644         rtsdtr_ctrl(info->MCR);
 645
 646         set_bit(TTY_IO_ERROR, &tty->flags);
 647
 648         info->tport.flags &= ~ASYNC_INITIALIZED;
 649         local_irq_restore(flags);
 650 }
 651
 652
 653 /*
 654  * This routine is called to set the UART divisor registers to match
 655  * the specified baud rate for a serial port.
 656  */
 657 static void change_speed(struct tty_struct *tty, struct serial_state *info,
 658                          struct ktermios *old_termios)
 659 {
 660         struct tty_port *port = &info->tport;
 661         int     quot = 0, baud_base, baud;
 662         unsigned cflag, cval = 0;
 663         int     bits;
 664         unsigned long   flags;
 665
 666         cflag = tty->termios.c_cflag;
 667
 668         /* Byte size is always 8 bits plus parity bit if requested */
 669
 670         cval = 3; bits = 10;
 671         if (cflag & CSTOPB) {
 672                 cval |= 0x04;
 673                 bits++;
 674         }
 675         if (cflag & PARENB) {
 676                 cval |= UART_LCR_PARITY;
 677                 bits++;
 678         }
 679         if (!(cflag & PARODD))
 680                 cval |= UART_LCR_EPAR;
 681 #ifdef CMSPAR
 682         if (cflag & CMSPAR)
 683                 cval |= UART_LCR_SPAR;
 684 #endif
 685
 686         /* Determine divisor based on baud rate */
 687         baud = tty_get_baud_rate(tty);
 688         if (!baud)
 689                 baud = 9600;    /* B0 transition handled in rs_set_termios */
 690         baud_base = info->baud_base;
 691         if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 692                 quot = info->custom_divisor;
 693         else {
 694                 if (baud == 134)
 695                         /* Special case since 134 is really 134.5 */
 696                         quot = (2*baud_base / 269);
 697                 else if (baud)
 698                         quot = baud_base / baud;
 699         }
 700         /* If the quotient is zero refuse the change */
 701         if (!quot && old_termios) {
 702                 /* FIXME: Will need updating for new tty in the end */
 703                 tty->termios.c_cflag &= ~CBAUD;
 704                 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
 705                 baud = tty_get_baud_rate(tty);
 706                 if (!baud)
 707                         baud = 9600;
 708                 if (baud == 38400 &&
 709                     (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 710                         quot = info->custom_divisor;
 711                 else {
 712                         if (baud == 134)
 713                                 /* Special case since 134 is really 134.5 */
 714                                 quot = (2*baud_base / 269);
 715                         else if (baud)
 716                                 quot = baud_base / baud;
 717                 }
 718         }
 719         /* As a last resort, if the quotient is zero, default to 9600 bps */
 720         if (!quot)
 721                 quot = baud_base / 9600;
 722         info->quot = quot;
 723         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
 724         info->timeout += HZ/50;         /* Add .02 seconds of slop */
 725
 726         /* CTS flow control flag and modem status interrupts */
 727         info->IER &= ~UART_IER_MSI;
 728         if (port->flags & ASYNC_HARDPPS_CD)
 729                 info->IER |= UART_IER_MSI;
 730         if (cflag & CRTSCTS) {
 731                 port->flags |= ASYNC_CTS_FLOW;
 732                 info->IER |= UART_IER_MSI;
 733         } else
 734                 port->flags &= ~ASYNC_CTS_FLOW;
 735         if (cflag & CLOCAL)
 736                 port->flags &= ~ASYNC_CHECK_CD;
 737         else {
 738                 port->flags |= ASYNC_CHECK_CD;
 739                 info->IER |= UART_IER_MSI;
 740         }
 741         /* TBD:
 742          * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
 743          */
 744
 745         /*
 746          * Set up parity check flag
 747          */
 748
 749         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
 750         if (I_INPCK(tty))
 751                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 752         if (I_BRKINT(tty) || I_PARMRK(tty))
 753                 info->read_status_mask |= UART_LSR_BI;
 754
 755         /*
 756          * Characters to ignore
 757          */
 758         info->ignore_status_mask = 0;
 759         if (I_IGNPAR(tty))
 760                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 761         if (I_IGNBRK(tty)) {
 762                 info->ignore_status_mask |= UART_LSR_BI;
 763                 /*
 764                  * If we're ignore parity and break indicators, ignore
 765                  * overruns too.  (For real raw support).
 766                  */
 767                 if (I_IGNPAR(tty))
 768                         info->ignore_status_mask |= UART_LSR_OE;
 769         }
 770         /*
 771          * !!! ignore all characters if CREAD is not set
 772          */
 773         if ((cflag & CREAD) == 0)
 774                 info->ignore_status_mask |= UART_LSR_DR;
 775         local_irq_save(flags);
 776
 777         {
 778           short serper;
 779
 780         /* Set up the baud rate */
 781           serper = quot - 1;
 782
 783         /* Enable or disable parity bit */
 784
 785         if(cval & UART_LCR_PARITY)
 786           serper |= (SERPER_PARENB);
 787
 788         custom.serper = serper;
 789         mb();
 790         }
 791
 792         local_irq_restore(flags);
 793 }
 794
 795 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 796 {
 797         struct serial_state *info;
 798         unsigned long flags;
 799
 800         info = tty->driver_data;
 801
 802         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
 803                 return 0;
 804
 805         if (!info->xmit.buf)
 806                 return 0;
 807
 808         local_irq_save(flags);
 809         if (CIRC_SPACE(info->xmit.head,
 810                        info->xmit.tail,
 811                        SERIAL_XMIT_SIZE) == 0) {
 812                 local_irq_restore(flags);
 813                 return 0;
 814         }
 815
 816         info->xmit.buf[info->xmit.head++] = ch;
 817         info->xmit.head &= SERIAL_XMIT_SIZE-1;
 818         local_irq_restore(flags);
 819         return 1;
 820 }
 821
 822 static void rs_flush_chars(struct tty_struct *tty)
 823 {
 824         struct serial_state *info = tty->driver_data;
 825         unsigned long flags;
 826
 827         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 828                 return;
 829
 830         if (info->xmit.head == info->xmit.tail
 831             || tty->stopped
 832             || tty->hw_stopped
 833             || !info->xmit.buf)
 834                 return;
 835
 836         local_irq_save(flags);
 837         info->IER |= UART_IER_THRI;
 838         custom.intena = IF_SETCLR | IF_TBE;
 839         mb();
 840         /* set a pending Tx Interrupt, transmitter should restart now */
 841         custom.intreq = IF_SETCLR | IF_TBE;
 842         mb();
 843         local_irq_restore(flags);
 844 }
 845
 846 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
 847 {
 848         int     c, ret = 0;
 849         struct serial_state *info = tty->driver_data;
 850         unsigned long flags;
 851
 852         if (serial_paranoia_check(info, tty->name, "rs_write"))
 853                 return 0;
 854
 855         if (!info->xmit.buf)
 856                 return 0;
 857
 858         local_irq_save(flags);
 859         while (1) {
 860                 c = CIRC_SPACE_TO_END(info->xmit.head,
 861                                       info->xmit.tail,
 862                                       SERIAL_XMIT_SIZE);
 863                 if (count < c)
 864                         c = count;
 865                 if (c <= 0) {
 866                         break;
 867                 }
 868                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 869                 info->xmit.head = ((info->xmit.head + c) &
 870                                    (SERIAL_XMIT_SIZE-1));
 871                 buf += c;
 872                 count -= c;
 873                 ret += c;
 874         }
 875         local_irq_restore(flags);
 876
 877         if (info->xmit.head != info->xmit.tail
 878             && !tty->stopped
 879             && !tty->hw_stopped
 880             && !(info->IER & UART_IER_THRI)) {
 881                 info->IER |= UART_IER_THRI;
 882                 local_irq_disable();
 883                 custom.intena = IF_SETCLR | IF_TBE;
 884                 mb();
 885                 /* set a pending Tx Interrupt, transmitter should restart now */
 886                 custom.intreq = IF_SETCLR | IF_TBE;
 887                 mb();
 888                 local_irq_restore(flags);
 889         }
 890         return ret;
 891 }
 892
 893 static int rs_write_room(struct tty_struct *tty)
 894 {
 895         struct serial_state *info = tty->driver_data;
 896
 897         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 898                 return 0;
 899         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 900 }
 901
 902 static int rs_chars_in_buffer(struct tty_struct *tty)
 903 {
 904         struct serial_state *info = tty->driver_data;
 905
 906         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 907                 return 0;
 908         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 909 }
 910
 911 static void rs_flush_buffer(struct tty_struct *tty)
 912 {
 913         struct serial_state *info = tty->driver_data;
 914         unsigned long flags;
 915
 916         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 917                 return;
 918         local_irq_save(flags);
 919         info->xmit.head = info->xmit.tail = 0;
 920         local_irq_restore(flags);
 921         tty_wakeup(tty);
 922 }
 923
 924 /*
 925  * This function is used to send a high-priority XON/XOFF character to
 926  * the device
 927  */
 928 static void rs_send_xchar(struct tty_struct *tty, char ch)
 929 {
 930         struct serial_state *info = tty->driver_data;
 931         unsigned long flags;
 932
 933         if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
 934                 return;
 935
 936         info->x_char = ch;
 937         if (ch) {
 938                 /* Make sure transmit interrupts are on */
 939
 940                 /* Check this ! */
 941                 local_irq_save(flags);
 942                 if(!(custom.intenar & IF_TBE)) {
 943                     custom.intena = IF_SETCLR | IF_TBE;
 944                     mb();
 945                     /* set a pending Tx Interrupt, transmitter should restart now */
 946                     custom.intreq = IF_SETCLR | IF_TBE;
 947                     mb();
 948                 }
 949                 local_irq_restore(flags);
 950
 951                 info->IER |= UART_IER_THRI;
 952         }
 953 }
 954
 955 /*
 956  * ------------------------------------------------------------
 957  * rs_throttle()
 958  *
 959  * This routine is called by the upper-layer tty layer to signal that
 960  * incoming characters should be throttled.
 961  * ------------------------------------------------------------
 962  */
 963 static void rs_throttle(struct tty_struct * tty)
 964 {
 965         struct serial_state *info = tty->driver_data;
 966         unsigned long flags;
 967 #ifdef SERIAL_DEBUG_THROTTLE
 968         printk("throttle %s ....\n", tty_name(tty));
 969 #endif
 970
 971         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 972                 return;
 973
 974         if (I_IXOFF(tty))
 975                 rs_send_xchar(tty, STOP_CHAR(tty));
 976
 977         if (C_CRTSCTS(tty))
 978                 info->MCR &= ~SER_RTS;
 979
 980         local_irq_save(flags);
 981         rtsdtr_ctrl(info->MCR);
 982         local_irq_restore(flags);
 983 }
 984
 985 static void rs_unthrottle(struct tty_struct * tty)
 986 {
 987         struct serial_state *info = tty->driver_data;
 988         unsigned long flags;
 989 #ifdef SERIAL_DEBUG_THROTTLE
 990         printk("unthrottle %s ....\n", tty_name(tty));
 991 #endif
 992
 993         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
 994                 return;
 995
 996         if (I_IXOFF(tty)) {
 997                 if (info->x_char)
 998                         info->x_char = 0;
 999                 else
1000                         rs_send_xchar(tty, START_CHAR(tty));
1001         }
1002         if (C_CRTSCTS(tty))
1003                 info->MCR |= SER_RTS;
1004         local_irq_save(flags);
1005         rtsdtr_ctrl(info->MCR);
1006         local_irq_restore(flags);
1007 }
1008
1009 /*
1010  * ------------------------------------------------------------
1011  * rs_ioctl() and friends
1012  * ------------------------------------------------------------
1013  */
1014
1015 static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
1016                            struct serial_struct __user * retinfo)
1017 {
1018         struct serial_struct tmp;
1019
1020         if (!retinfo)
1021                 return -EFAULT;
1022         memset(&tmp, 0, sizeof(tmp));
1023         tty_lock(tty);
1024         tmp.line = tty->index;
1025         tmp.port = state->port;
1026         tmp.flags = state->tport.flags;
1027         tmp.xmit_fifo_size = state->xmit_fifo_size;
1028         tmp.baud_base = state->baud_base;
1029         tmp.close_delay = state->tport.close_delay;
1030         tmp.closing_wait = state->tport.closing_wait;
1031         tmp.custom_divisor = state->custom_divisor;
1032         tty_unlock(tty);
1033         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1034                 return -EFAULT;
1035         return 0;
1036 }
1037
1038 static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
1039                            struct serial_struct __user * new_info)
1040 {
1041         struct tty_port *port = &state->tport;
1042         struct serial_struct new_serial;
1043         bool change_spd;
1044         int                     retval = 0;
1045
1046         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1047                 return -EFAULT;
1048
1049         tty_lock(tty);
1050         change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
1051                 new_serial.custom_divisor != state->custom_divisor;
1052         if (new_serial.irq || new_serial.port != state->port ||
1053                         new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1054                 tty_unlock(tty);
1055                 return -EINVAL;
1056         }
1057
1058         if (!serial_isroot()) {
1059                 if ((new_serial.baud_base != state->baud_base) ||
1060                     (new_serial.close_delay != port->close_delay) ||
1061                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1062                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1063                      (port->flags & ~ASYNC_USR_MASK))) {
1064                         tty_unlock(tty);
1065                         return -EPERM;
1066                 }
1067                 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1068                                (new_serial.flags & ASYNC_USR_MASK));
1069                 state->custom_divisor = new_serial.custom_divisor;
1070                 goto check_and_exit;
1071         }
1072
1073         if (new_serial.baud_base < 9600) {
1074                 tty_unlock(tty);
1075                 return -EINVAL;
1076         }
1077
1078         /*
1079          * OK, past this point, all the error checking has been done.
1080          * At this point, we start making changes.....
1081          */
1082
1083         state->baud_base = new_serial.baud_base;
1084         port->flags = ((port->flags & ~ASYNC_FLAGS) |
1085                         (new_serial.flags & ASYNC_FLAGS));
1086         state->custom_divisor = new_serial.custom_divisor;
1087         port->close_delay = new_serial.close_delay * HZ/100;
1088         port->closing_wait = new_serial.closing_wait * HZ/100;
1089         port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1090
1091 check_and_exit:
1092         if (port->flags & ASYNC_INITIALIZED) {
1093                 if (change_spd) {
1094                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1095                                 tty->alt_speed = 57600;
1096                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1097                                 tty->alt_speed = 115200;
1098                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1099                                 tty->alt_speed = 230400;
1100                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1101                                 tty->alt_speed = 460800;
1102                         change_speed(tty, state, NULL);
1103                 }
1104         } else
1105                 retval = startup(tty, state);
1106         tty_unlock(tty);
1107         return retval;
1108 }
1109
1110
1111 /*
1112  * get_lsr_info - get line status register info
1113  *
1114  * Purpose: Let user call ioctl() to get info when the UART physically
1115  *          is emptied.  On bus types like RS485, the transmitter must
1116  *          release the bus after transmitting. This must be done when
1117  *          the transmit shift register is empty, not be done when the
1118  *          transmit holding register is empty.  This functionality
1119  *          allows an RS485 driver to be written in user space.
1120  */
1121 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1122 {
1123         unsigned char status;
1124         unsigned int result;
1125         unsigned long flags;
1126
1127         local_irq_save(flags);
1128         status = custom.serdatr;
1129         mb();
1130         local_irq_restore(flags);
1131         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1132         if (copy_to_user(value, &result, sizeof(int)))
1133                 return -EFAULT;
1134         return 0;
1135 }
1136
1137
1138 static int rs_tiocmget(struct tty_struct *tty)
1139 {
1140         struct serial_state *info = tty->driver_data;
1141         unsigned char control, status;
1142         unsigned long flags;
1143
1144         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1145                 return -ENODEV;
1146         if (tty->flags & (1 << TTY_IO_ERROR))
1147                 return -EIO;
1148
1149         control = info->MCR;
1150         local_irq_save(flags);
1151         status = ciab.pra;
1152         local_irq_restore(flags);
1153         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1154                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1155                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1156                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1157                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1158 }
1159
1160 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1161                                                 unsigned int clear)
1162 {
1163         struct serial_state *info = tty->driver_data;
1164         unsigned long flags;
1165
1166         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1167                 return -ENODEV;
1168         if (tty->flags & (1 << TTY_IO_ERROR))
1169                 return -EIO;
1170
1171         local_irq_save(flags);
1172         if (set & TIOCM_RTS)
1173                 info->MCR |= SER_RTS;
1174         if (set & TIOCM_DTR)
1175                 info->MCR |= SER_DTR;
1176         if (clear & TIOCM_RTS)
1177                 info->MCR &= ~SER_RTS;
1178         if (clear & TIOCM_DTR)
1179                 info->MCR &= ~SER_DTR;
1180         rtsdtr_ctrl(info->MCR);
1181         local_irq_restore(flags);
1182         return 0;
1183 }
1184
1185 /*
1186  * rs_break() --- routine which turns the break handling on or off
1187  */
1188 static int rs_break(struct tty_struct *tty, int break_state)
1189 {
1190         struct serial_state *info = tty->driver_data;
1191         unsigned long flags;
1192
1193         if (serial_paranoia_check(info, tty->name, "rs_break"))
1194                 return -EINVAL;
1195
1196         local_irq_save(flags);
1197         if (break_state == -1)
1198           custom.adkcon = AC_SETCLR | AC_UARTBRK;
1199         else
1200           custom.adkcon = AC_UARTBRK;
1201         mb();
1202         local_irq_restore(flags);
1203         return 0;
1204 }
1205
1206 /*
1207  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1208  * Return: write counters to the user passed counter struct
1209  * NB: both 1->0 and 0->1 transitions are counted except for
1210  *     RI where only 0->1 is counted.
1211  */
1212 static int rs_get_icount(struct tty_struct *tty,
1213                                 struct serial_icounter_struct *icount)
1214 {
1215         struct serial_state *info = tty->driver_data;
1216         struct async_icount cnow;
1217         unsigned long flags;
1218
1219         local_irq_save(flags);
1220         cnow = info->icount;
1221         local_irq_restore(flags);
1222         icount->cts = cnow.cts;
1223         icount->dsr = cnow.dsr;
1224         icount->rng = cnow.rng;
1225         icount->dcd = cnow.dcd;
1226         icount->rx = cnow.rx;
1227         icount->tx = cnow.tx;
1228         icount->frame = cnow.frame;
1229         icount->overrun = cnow.overrun;
1230         icount->parity = cnow.parity;
1231         icount->brk = cnow.brk;
1232         icount->buf_overrun = cnow.buf_overrun;
1233
1234         return 0;
1235 }
1236
1237 static int rs_ioctl(struct tty_struct *tty,
1238                     unsigned int cmd, unsigned long arg)
1239 {
1240         struct serial_state *info = tty->driver_data;
1241         struct async_icount cprev, cnow;        /* kernel counter temps */
1242         void __user *argp = (void __user *)arg;
1243         unsigned long flags;
1244         DEFINE_WAIT(wait);
1245         int ret;
1246
1247         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1248                 return -ENODEV;
1249
1250         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1251             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1252             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1253                 if (tty->flags & (1 << TTY_IO_ERROR))
1254                     return -EIO;
1255         }
1256
1257         switch (cmd) {
1258                 case TIOCGSERIAL:
1259                         return get_serial_info(tty, info, argp);
1260                 case TIOCSSERIAL:
1261                         return set_serial_info(tty, info, argp);
1262                 case TIOCSERCONFIG:
1263                         return 0;
1264
1265                 case TIOCSERGETLSR: /* Get line status register */
1266                         return get_lsr_info(info, argp);
1267
1268                 case TIOCSERGSTRUCT:
1269                         if (copy_to_user(argp,
1270                                          info, sizeof(struct serial_state)))
1271                                 return -EFAULT;
1272                         return 0;
1273
1274                 /*
1275                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1276                  * - mask passed in arg for lines of interest
1277                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1278                  * Caller should use TIOCGICOUNT to see which one it was
1279                  */
1280                 case TIOCMIWAIT:
1281                         local_irq_save(flags);
1282                         /* note the counters on entry */
1283                         cprev = info->icount;
1284                         local_irq_restore(flags);
1285                         while (1) {
1286                                 prepare_to_wait(&info->tport.delta_msr_wait,
1287                                                 &wait, TASK_INTERRUPTIBLE);
1288                                 local_irq_save(flags);
1289                                 cnow = info->icount; /* atomic copy */
1290                                 local_irq_restore(flags);
1291                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1292                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1293                                         ret = -EIO; /* no change => error */
1294                                         break;
1295                                 }
1296                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1297                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1298                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1299                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1300                                         ret = 0;
1301                                         break;
1302                                 }
1303                                 schedule();
1304                                 /* see if a signal did it */
1305                                 if (signal_pending(current)) {
1306                                         ret = -ERESTARTSYS;
1307                                         break;
1308                                 }
1309                                 cprev = cnow;
1310                         }
1311                         finish_wait(&info->tport.delta_msr_wait, &wait);
1312                         return ret;
1313
1314                 case TIOCSERGWILD:
1315                 case TIOCSERSWILD:
1316                         /* "setserial -W" is called in Debian boot */
1317                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1318                         return 0;
1319
1320                 default:
1321                         return -ENOIOCTLCMD;
1322                 }
1323         return 0;
1324 }
1325
1326 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1327 {
1328         struct serial_state *info = tty->driver_data;
1329         unsigned long flags;
1330         unsigned int cflag = tty->termios.c_cflag;
1331
1332         change_speed(tty, info, old_termios);
1333
1334         /* Handle transition to B0 status */
1335         if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1336                 info->MCR &= ~(SER_DTR|SER_RTS);
1337                 local_irq_save(flags);
1338                 rtsdtr_ctrl(info->MCR);
1339                 local_irq_restore(flags);
1340         }
1341
1342         /* Handle transition away from B0 status */
1343         if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1344                 info->MCR |= SER_DTR;
1345                 if (!C_CRTSCTS(tty) || !test_bit(TTY_THROTTLED, &tty->flags))
1346                         info->MCR |= SER_RTS;
1347                 local_irq_save(flags);
1348                 rtsdtr_ctrl(info->MCR);
1349                 local_irq_restore(flags);
1350         }
1351
1352         /* Handle turning off CRTSCTS */
1353         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1354                 tty->hw_stopped = 0;
1355                 rs_start(tty);
1356         }
1357
1358 #if 0
1359         /*
1360          * No need to wake up processes in open wait, since they
1361          * sample the CLOCAL flag once, and don't recheck it.
1362          * XXX  It's not clear whether the current behavior is correct
1363          * or not.  Hence, this may change.....
1364          */
1365         if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1366                 wake_up_interruptible(&info->open_wait);
1367 #endif
1368 }
1369
1370 /*
1371  * ------------------------------------------------------------
1372  * rs_close()
1373  *
1374  * This routine is called when the serial port gets closed.  First, we
1375  * wait for the last remaining data to be sent.  Then, we unlink its
1376  * async structure from the interrupt chain if necessary, and we free
1377  * that IRQ if nothing is left in the chain.
1378  * ------------------------------------------------------------
1379  */
1380 static void rs_close(struct tty_struct *tty, struct file * filp)
1381 {
1382         struct serial_state *state = tty->driver_data;
1383         struct tty_port *port = &state->tport;
1384
1385         if (serial_paranoia_check(state, tty->name, "rs_close"))
1386                 return;
1387
1388         if (tty_port_close_start(port, tty, filp) == 0)
1389                 return;
1390
1391         /*
1392          * At this point we stop accepting input.  To do this, we
1393          * disable the receive line status interrupts, and tell the
1394          * interrupt driver to stop checking the data ready bit in the
1395          * line status register.
1396          */
1397         state->read_status_mask &= ~UART_LSR_DR;
1398         if (port->flags & ASYNC_INITIALIZED) {
1399                 /* disable receive interrupts */
1400                 custom.intena = IF_RBF;
1401                 mb();
1402                 /* clear any pending receive interrupt */
1403                 custom.intreq = IF_RBF;
1404                 mb();
1405
1406                 /*
1407                  * Before we drop DTR, make sure the UART transmitter
1408                  * has completely drained; this is especially
1409                  * important if there is a transmit FIFO!
1410                  */
1411                 rs_wait_until_sent(tty, state->timeout);
1412         }
1413         shutdown(tty, state);
1414         rs_flush_buffer(tty);
1415
1416         tty_ldisc_flush(tty);
1417         port->tty = NULL;
1418
1419         tty_port_close_end(port, tty);
1420 }
1421
1422 /*
1423  * rs_wait_until_sent() --- wait until the transmitter is empty
1424  */
1425 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1426 {
1427         struct serial_state *info = tty->driver_data;
1428         unsigned long orig_jiffies, char_time;
1429         int lsr;
1430
1431         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1432                 return;
1433
1434         if (info->xmit_fifo_size == 0)
1435                 return; /* Just in case.... */
1436
1437         orig_jiffies = jiffies;
1438
1439         /*
1440          * Set the check interval to be 1/5 of the estimated time to
1441          * send a single character, and make it at least 1.  The check
1442          * interval should also be less than the timeout.
1443          *
1444          * Note: we have to use pretty tight timings here to satisfy
1445          * the NIST-PCTS.
1446          */
1447         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1448         char_time = char_time / 5;
1449         if (char_time == 0)
1450                 char_time = 1;
1451         if (timeout)
1452           char_time = min_t(unsigned long, char_time, timeout);
1453         /*
1454          * If the transmitter hasn't cleared in twice the approximate
1455          * amount of time to send the entire FIFO, it probably won't
1456          * ever clear.  This assumes the UART isn't doing flow
1457          * control, which is currently the case.  Hence, if it ever
1458          * takes longer than info->timeout, this is probably due to a
1459          * UART bug of some kind.  So, we clamp the timeout parameter at
1460          * 2*info->timeout.
1461          */
1462         if (!timeout || timeout > 2*info->timeout)
1463                 timeout = 2*info->timeout;
1464 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1465         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1466         printk("jiff=%lu...", jiffies);
1467 #endif
1468         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1469 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1470                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1471 #endif
1472                 msleep_interruptible(jiffies_to_msecs(char_time));
1473                 if (signal_pending(current))
1474                         break;
1475                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1476                         break;
1477         }
1478         __set_current_state(TASK_RUNNING);
1479
1480 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1481         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1482 #endif
1483 }
1484
1485 /*
1486  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1487  */
1488 static void rs_hangup(struct tty_struct *tty)
1489 {
1490         struct serial_state *info = tty->driver_data;
1491
1492         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1493                 return;
1494
1495         rs_flush_buffer(tty);
1496         shutdown(tty, info);
1497         info->tport.count = 0;
1498         info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
1499         info->tport.tty = NULL;
1500         wake_up_interruptible(&info->tport.open_wait);
1501 }
1502
1503 /*
1504  * This routine is called whenever a serial port is opened.  It
1505  * enables interrupts for a serial port, linking in its async structure into
1506  * the IRQ chain.   It also performs the serial-specific
1507  * initialization for the tty structure.
1508  */
1509 static int rs_open(struct tty_struct *tty, struct file * filp)
1510 {
1511         struct serial_state *info = rs_table + tty->index;
1512         struct tty_port *port = &info->tport;
1513         int retval;
1514
1515         port->count++;
1516         port->tty = tty;
1517         tty->driver_data = info;
1518         tty->port = port;
1519         if (serial_paranoia_check(info, tty->name, "rs_open"))
1520                 return -ENODEV;
1521
1522         port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1523
1524         retval = startup(tty, info);
1525         if (retval) {
1526                 return retval;
1527         }
1528
1529         return tty_port_block_til_ready(port, tty, filp);
1530 }
1531
1532 /*
1533  * /proc fs routines....
1534  */
1535
1536 static inline void line_info(struct seq_file *m, int line,
1537                 struct serial_state *state)
1538 {
1539         char    stat_buf[30], control, status;
1540         unsigned long flags;
1541
1542         seq_printf(m, "%d: uart:amiga_builtin", line);
1543
1544         local_irq_save(flags);
1545         status = ciab.pra;
1546         control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status;
1547         local_irq_restore(flags);
1548
1549         stat_buf[0] = 0;
1550         stat_buf[1] = 0;
1551         if(!(control & SER_RTS))
1552                 strcat(stat_buf, "|RTS");
1553         if(!(status & SER_CTS))
1554                 strcat(stat_buf, "|CTS");
1555         if(!(control & SER_DTR))
1556                 strcat(stat_buf, "|DTR");
1557         if(!(status & SER_DSR))
1558                 strcat(stat_buf, "|DSR");
1559         if(!(status & SER_DCD))
1560                 strcat(stat_buf, "|CD");
1561
1562         if (state->quot)
1563                 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1564
1565         seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1566
1567         if (state->icount.frame)
1568                 seq_printf(m, " fe:%d", state->icount.frame);
1569
1570         if (state->icount.parity)
1571                 seq_printf(m, " pe:%d", state->icount.parity);
1572
1573         if (state->icount.brk)
1574                 seq_printf(m, " brk:%d", state->icount.brk);
1575
1576         if (state->icount.overrun)
1577                 seq_printf(m, " oe:%d", state->icount.overrun);
1578
1579         /*
1580          * Last thing is the RS-232 status lines
1581          */
1582         seq_printf(m, " %s\n", stat_buf+1);
1583 }
1584
1585 static int rs_proc_show(struct seq_file *m, void *v)
1586 {
1587         seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1588         line_info(m, 0, &rs_table[0]);
1589         return 0;
1590 }
1591
1592 static int rs_proc_open(struct inode *inode, struct file *file)
1593 {
1594         return single_open(file, rs_proc_show, NULL);
1595 }
1596
1597 static const struct file_operations rs_proc_fops = {
1598         .owner          = THIS_MODULE,
1599         .open           = rs_proc_open,
1600         .read           = seq_read,
1601         .llseek         = seq_lseek,
1602         .release        = single_release,
1603 };
1604
1605 /*
1606  * ---------------------------------------------------------------------
1607  * rs_init() and friends
1608  *
1609  * rs_init() is called at boot-time to initialize the serial driver.
1610  * ---------------------------------------------------------------------
1611  */
1612
1613 /*
1614  * This routine prints out the appropriate serial driver version
1615  * number, and identifies which options were configured into this
1616  * driver.
1617  */
1618 static void show_serial_version(void)
1619 {
1620         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1621 }
1622
1623
1624 static const struct tty_operations serial_ops = {
1625         .open = rs_open,
1626         .close = rs_close,
1627         .write = rs_write,
1628         .put_char = rs_put_char,
1629         .flush_chars = rs_flush_chars,
1630         .write_room = rs_write_room,
1631         .chars_in_buffer = rs_chars_in_buffer,
1632         .flush_buffer = rs_flush_buffer,
1633         .ioctl = rs_ioctl,
1634         .throttle = rs_throttle,
1635         .unthrottle = rs_unthrottle,
1636         .set_termios = rs_set_termios,
1637         .stop = rs_stop,
1638         .start = rs_start,
1639         .hangup = rs_hangup,
1640         .break_ctl = rs_break,
1641         .send_xchar = rs_send_xchar,
1642         .wait_until_sent = rs_wait_until_sent,
1643         .tiocmget = rs_tiocmget,
1644         .tiocmset = rs_tiocmset,
1645         .get_icount = rs_get_icount,
1646         .proc_fops = &rs_proc_fops,
1647 };
1648
1649 static int amiga_carrier_raised(struct tty_port *port)
1650 {
1651         return !(ciab.pra & SER_DCD);
1652 }
1653
1654 static void amiga_dtr_rts(struct tty_port *port, int raise)
1655 {
1656         struct serial_state *info = container_of(port, struct serial_state,
1657                         tport);
1658         unsigned long flags;
1659
1660         if (raise)
1661                 info->MCR |= SER_DTR|SER_RTS;
1662         else
1663                 info->MCR &= ~(SER_DTR|SER_RTS);
1664
1665         local_irq_save(flags);
1666         rtsdtr_ctrl(info->MCR);
1667         local_irq_restore(flags);
1668 }
1669
1670 static const struct tty_port_operations amiga_port_ops = {
1671         .carrier_raised = amiga_carrier_raised,
1672         .dtr_rts = amiga_dtr_rts,
1673 };
1674
1675 /*
1676  * The serial driver boot-time initialization code!
1677  */
1678 static int __init amiga_serial_probe(struct platform_device *pdev)
1679 {
1680         unsigned long flags;
1681         struct serial_state * state;
1682         int error;
1683
1684         serial_driver = alloc_tty_driver(NR_PORTS);
1685         if (!serial_driver)
1686                 return -ENOMEM;
1687
1688         show_serial_version();
1689
1690         /* Initialize the tty_driver structure */
1691
1692         serial_driver->driver_name = "amiserial";
1693         serial_driver->name = "ttyS";
1694         serial_driver->major = TTY_MAJOR;
1695         serial_driver->minor_start = 64;
1696         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1697         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1698         serial_driver->init_termios = tty_std_termios;
1699         serial_driver->init_termios.c_cflag =
1700                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1701         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1702         tty_set_operations(serial_driver, &serial_ops);
1703
1704         state = rs_table;
1705         state->port = (int)&custom.serdatr; /* Just to give it a value */
1706         state->custom_divisor = 0;
1707         state->icount.cts = state->icount.dsr =
1708           state->icount.rng = state->icount.dcd = 0;
1709         state->icount.rx = state->icount.tx = 0;
1710         state->icount.frame = state->icount.parity = 0;
1711         state->icount.overrun = state->icount.brk = 0;
1712         tty_port_init(&state->tport);
1713         state->tport.ops = &amiga_port_ops;
1714         tty_port_link_device(&state->tport, serial_driver, 0);
1715
1716         error = tty_register_driver(serial_driver);
1717         if (error)
1718                 goto fail_put_tty_driver;
1719
1720         printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1721
1722         /* Hardware set up */
1723
1724         state->baud_base = amiga_colorclock;
1725         state->xmit_fifo_size = 1;
1726
1727         /* set ISRs, and then disable the rx interrupts */
1728         error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1729         if (error)
1730                 goto fail_unregister;
1731
1732         error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1733                             "serial RX", state);
1734         if (error)
1735                 goto fail_free_irq;
1736
1737         local_irq_save(flags);
1738
1739         /* turn off Rx and Tx interrupts */
1740         custom.intena = IF_RBF | IF_TBE;
1741         mb();
1742
1743         /* clear any pending interrupt */
1744         custom.intreq = IF_RBF | IF_TBE;
1745         mb();
1746
1747         local_irq_restore(flags);
1748
1749         /*
1750          * set the appropriate directions for the modem control flags,
1751          * and clear RTS and DTR
1752          */
1753         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
1754         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
1755
1756         platform_set_drvdata(pdev, state);
1757
1758         return 0;
1759
1760 fail_free_irq:
1761         free_irq(IRQ_AMIGA_TBE, state);
1762 fail_unregister:
1763         tty_unregister_driver(serial_driver);
1764 fail_put_tty_driver:
1765         tty_port_destroy(&state->tport);
1766         put_tty_driver(serial_driver);
1767         return error;
1768 }
1769
1770 static int __exit amiga_serial_remove(struct platform_device *pdev)
1771 {
1772         int error;
1773         struct serial_state *state = platform_get_drvdata(pdev);
1774
1775         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1776         error = tty_unregister_driver(serial_driver);
1777         if (error)
1778                 printk("SERIAL: failed to unregister serial driver (%d)\n",
1779                        error);
1780         put_tty_driver(serial_driver);
1781         tty_port_destroy(&state->tport);
1782
1783         free_irq(IRQ_AMIGA_TBE, state);
1784         free_irq(IRQ_AMIGA_RBF, state);
1785
1786         return error;
1787 }
1788
1789 static struct platform_driver amiga_serial_driver = {
1790         .remove = __exit_p(amiga_serial_remove),
1791         .driver   = {
1792                 .name   = "amiga-serial",
1793         },
1794 };
1795
1796 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1797
1798
1799 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1800
1801 /*
1802  * ------------------------------------------------------------
1803  * Serial console driver
1804  * ------------------------------------------------------------
1805  */
1806
1807 static void amiga_serial_putc(char c)
1808 {
1809         custom.serdat = (unsigned char)c | 0x100;
1810         while (!(custom.serdatr & 0x2000))
1811                 barrier();
1812 }
1813
1814 /*
1815  *      Print a string to the serial port trying not to disturb
1816  *      any possible real use of the port...
1817  *
1818  *      The console must be locked when we get here.
1819  */
1820 static void serial_console_write(struct console *co, const char *s,
1821                                 unsigned count)
1822 {
1823         unsigned short intena = custom.intenar;
1824
1825         custom.intena = IF_TBE;
1826
1827         while (count--) {
1828                 if (*s == '\n')
1829                         amiga_serial_putc('\r');
1830                 amiga_serial_putc(*s++);
1831         }
1832
1833         custom.intena = IF_SETCLR | (intena & IF_TBE);
1834 }
1835
1836 static struct tty_driver *serial_console_device(struct console *c, int *index)
1837 {
1838         *index = 0;
1839         return serial_driver;
1840 }
1841
1842 static struct console sercons = {
1843         .name =         "ttyS",
1844         .write =        serial_console_write,
1845         .device =       serial_console_device,
1846         .flags =        CON_PRINTBUFFER,
1847         .index =        -1,
1848 };
1849
1850 /*
1851  *      Register console.
1852  */
1853 static int __init amiserial_console_init(void)
1854 {
1855         if (!MACH_IS_AMIGA)
1856                 return -ENODEV;
1857
1858         register_console(&sercons);
1859         return 0;
1860 }
1861 console_initcall(amiserial_console_init);
1862
1863 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1864
1865 MODULE_LICENSE("GPL");
1866 MODULE_ALIAS("platform:amiga-serial");