Pileus Git - ~andy/linux/blob - 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 #define SERIAL_DO_RESTART
  36
  37 /* Set of debugging defines */
  38
  39 #undef SERIAL_DEBUG_INTR
  40 #undef SERIAL_DEBUG_OPEN
  41 #undef SERIAL_DEBUG_FLOW
  42 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
  43
  44 /* Sanity checks */
  45
  46 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
  47 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
  48  tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
  49 #else
  50 #define DBG_CNT(s)
  51 #endif
  52
  53 /*
  54  * End of serial driver configuration section.
  55  */
  56
  57 #include <linux/module.h>
  58
  59 #include <linux/types.h>
  60 #include <linux/serial.h>
  61 #include <linux/serial_reg.h>
  62 static char *serial_version = "4.30";
  63
  64 #include <linux/errno.h>
  65 #include <linux/signal.h>
  66 #include <linux/sched.h>
  67 #include <linux/kernel.h>
  68 #include <linux/timer.h>
  69 #include <linux/interrupt.h>
  70 #include <linux/tty.h>
  71 #include <linux/tty_flip.h>
  72 #include <linux/circ_buf.h>
  73 #include <linux/console.h>
  74 #include <linux/major.h>
  75 #include <linux/string.h>
  76 #include <linux/fcntl.h>
  77 #include <linux/ptrace.h>
  78 #include <linux/ioport.h>
  79 #include <linux/mm.h>
  80 #include <linux/seq_file.h>
  81 #include <linux/slab.h>
  82 #include <linux/init.h>
  83 #include <linux/bitops.h>
  84 #include <linux/platform_device.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 struct serial_state {
  96         struct tty_port         tport;
  97         struct circ_buf         xmit;
  98         struct async_icount     icount;
  99
 100         unsigned long           port;
 101         int                     baud_base;
 102         int                     xmit_fifo_size;
 103         int                     custom_divisor;
 104         int                     read_status_mask;
 105         int                     ignore_status_mask;
 106         int                     timeout;
 107         int                     quot;
 108         int                     IER;    /* Interrupt Enable Register */
 109         int                     MCR;    /* Modem control register */
 110         int                     x_char; /* xon/xoff character */
 111 };
 112
 113 #define custom amiga_custom
 114 static char *serial_name = "Amiga-builtin serial driver";
 115
 116 static struct tty_driver *serial_driver;
 117
 118 /* number of characters left in xmit buffer before we ask for more */
 119 #define WAKEUP_CHARS 256
 120
 121 static unsigned char current_ctl_bits;
 122
 123 static void change_speed(struct tty_struct *tty, struct serial_state *info,
 124                 struct ktermios *old);
 125 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
 126
 127
 128 static struct serial_state rs_table[1];
 129
 130 #define NR_PORTS ARRAY_SIZE(rs_table)
 131
 132 #include <asm/uaccess.h>
 133
 134 #define serial_isroot() (capable(CAP_SYS_ADMIN))
 135
 136
 137 static inline int serial_paranoia_check(struct serial_state *info,
 138                                         char *name, const char *routine)
 139 {
 140 #ifdef SERIAL_PARANOIA_CHECK
 141         static const char *badmagic =
 142                 "Warning: bad magic number for serial struct (%s) in %s\n";
 143         static const char *badinfo =
 144                 "Warning: null async_struct for (%s) in %s\n";
 145
 146         if (!info) {
 147                 printk(badinfo, name, routine);
 148                 return 1;
 149         }
 150         if (info->magic != SERIAL_MAGIC) {
 151                 printk(badmagic, name, routine);
 152                 return 1;
 153         }
 154 #endif
 155         return 0;
 156 }
 157
 158 /* some serial hardware definitions */
 159 #define SDR_OVRUN   (1<<15)
 160 #define SDR_RBF     (1<<14)
 161 #define SDR_TBE     (1<<13)
 162 #define SDR_TSRE    (1<<12)
 163
 164 #define SERPER_PARENB    (1<<15)
 165
 166 #define AC_SETCLR   (1<<15)
 167 #define AC_UARTBRK  (1<<11)
 168
 169 #define SER_DTR     (1<<7)
 170 #define SER_RTS     (1<<6)
 171 #define SER_DCD     (1<<5)
 172 #define SER_CTS     (1<<4)
 173 #define SER_DSR     (1<<3)
 174
 175 static __inline__ void rtsdtr_ctrl(int bits)
 176 {
 177     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
 178 }
 179
 180 /*
 181  * ------------------------------------------------------------
 182  * rs_stop() and rs_start()
 183  *
 184  * This routines are called before setting or resetting tty->stopped.
 185  * They enable or disable transmitter interrupts, as necessary.
 186  * ------------------------------------------------------------
 187  */
 188 static void rs_stop(struct tty_struct *tty)
 189 {
 190         struct serial_state *info = tty->driver_data;
 191         unsigned long flags;
 192
 193         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 194                 return;
 195
 196         local_irq_save(flags);
 197         if (info->IER & UART_IER_THRI) {
 198                 info->IER &= ~UART_IER_THRI;
 199                 /* disable Tx interrupt and remove any pending interrupts */
 200                 custom.intena = IF_TBE;
 201                 mb();
 202                 custom.intreq = IF_TBE;
 203                 mb();
 204         }
 205         local_irq_restore(flags);
 206 }
 207
 208 static void rs_start(struct tty_struct *tty)
 209 {
 210         struct serial_state *info = tty->driver_data;
 211         unsigned long flags;
 212
 213         if (serial_paranoia_check(info, tty->name, "rs_start"))
 214                 return;
 215
 216         local_irq_save(flags);
 217         if (info->xmit.head != info->xmit.tail
 218             && info->xmit.buf
 219             && !(info->IER & UART_IER_THRI)) {
 220                 info->IER |= UART_IER_THRI;
 221                 custom.intena = IF_SETCLR | IF_TBE;
 222                 mb();
 223                 /* set a pending Tx Interrupt, transmitter should restart now */
 224                 custom.intreq = IF_SETCLR | IF_TBE;
 225                 mb();
 226         }
 227         local_irq_restore(flags);
 228 }
 229
 230 /*
 231  * ----------------------------------------------------------------------
 232  *
 233  * Here starts the interrupt handling routines.  All of the following
 234  * subroutines are declared as inline and are folded into
 235  * rs_interrupt().  They were separated out for readability's sake.
 236  *
 237  * Note: rs_interrupt() is a "fast" interrupt, which means that it
 238  * runs with interrupts turned off.  People who may want to modify
 239  * rs_interrupt() should try to keep the interrupt handler as fast as
 240  * possible.  After you are done making modifications, it is not a bad
 241  * idea to do:
 242  *
 243  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 244  *
 245  * and look at the resulting assemble code in serial.s.
 246  *
 247  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
 248  * -----------------------------------------------------------------------
 249  */
 250
 251 static void receive_chars(struct serial_state *info)
 252 {
 253         int status;
 254         int serdatr;
 255         struct tty_struct *tty = info->tport.tty;
 256         unsigned char ch, flag;
 257         struct  async_icount *icount;
 258         int oe = 0;
 259
 260         icount = &info->icount;
 261
 262         status = UART_LSR_DR; /* We obviously have a character! */
 263         serdatr = custom.serdatr;
 264         mb();
 265         custom.intreq = IF_RBF;
 266         mb();
 267
 268         if((serdatr & 0x1ff) == 0)
 269             status |= UART_LSR_BI;
 270         if(serdatr & SDR_OVRUN)
 271             status |= UART_LSR_OE;
 272
 273         ch = serdatr & 0xff;
 274         icount->rx++;
 275
 276 #ifdef SERIAL_DEBUG_INTR
 277         printk("DR%02x:%02x...", ch, status);
 278 #endif
 279         flag = TTY_NORMAL;
 280
 281         /*
 282          * We don't handle parity or frame errors - but I have left
 283          * the code in, since I'm not sure that the errors can't be
 284          * detected.
 285          */
 286
 287         if (status & (UART_LSR_BI | UART_LSR_PE |
 288                       UART_LSR_FE | UART_LSR_OE)) {
 289           /*
 290            * For statistics only
 291            */
 292           if (status & UART_LSR_BI) {
 293             status &= ~(UART_LSR_FE | UART_LSR_PE);
 294             icount->brk++;
 295           } else if (status & UART_LSR_PE)
 296             icount->parity++;
 297           else if (status & UART_LSR_FE)
 298             icount->frame++;
 299           if (status & UART_LSR_OE)
 300             icount->overrun++;
 301
 302           /*
 303            * Now check to see if character should be
 304            * ignored, and mask off conditions which
 305            * should be ignored.
 306            */
 307           if (status & info->ignore_status_mask)
 308             goto out;
 309
 310           status &= info->read_status_mask;
 311
 312           if (status & (UART_LSR_BI)) {
 313 #ifdef SERIAL_DEBUG_INTR
 314             printk("handling break....");
 315 #endif
 316             flag = TTY_BREAK;
 317             if (info->tport.flags & ASYNC_SAK)
 318               do_SAK(tty);
 319           } else if (status & UART_LSR_PE)
 320             flag = TTY_PARITY;
 321           else if (status & UART_LSR_FE)
 322             flag = TTY_FRAME;
 323           if (status & UART_LSR_OE) {
 324             /*
 325              * Overrun is special, since it's
 326              * reported immediately, and doesn't
 327              * affect the current character
 328              */
 329              oe = 1;
 330           }
 331         }
 332         tty_insert_flip_char(tty, ch, flag);
 333         if (oe == 1)
 334                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 335         tty_flip_buffer_push(tty);
 336 out:
 337         return;
 338 }
 339
 340 static void transmit_chars(struct serial_state *info)
 341 {
 342         custom.intreq = IF_TBE;
 343         mb();
 344         if (info->x_char) {
 345                 custom.serdat = info->x_char | 0x100;
 346                 mb();
 347                 info->icount.tx++;
 348                 info->x_char = 0;
 349                 return;
 350         }
 351         if (info->xmit.head == info->xmit.tail
 352             || info->tport.tty->stopped
 353             || info->tport.tty->hw_stopped) {
 354                 info->IER &= ~UART_IER_THRI;
 355                 custom.intena = IF_TBE;
 356                 mb();
 357                 return;
 358         }
 359
 360         custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
 361         mb();
 362         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
 363         info->icount.tx++;
 364
 365         if (CIRC_CNT(info->xmit.head,
 366                      info->xmit.tail,
 367                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
 368                 tty_wakeup(info->tport.tty);
 369
 370 #ifdef SERIAL_DEBUG_INTR
 371         printk("THRE...");
 372 #endif
 373         if (info->xmit.head == info->xmit.tail) {
 374                 custom.intena = IF_TBE;
 375                 mb();
 376                 info->IER &= ~UART_IER_THRI;
 377         }
 378 }
 379
 380 static void check_modem_status(struct serial_state *info)
 381 {
 382         struct tty_port *port = &info->tport;
 383         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 384         unsigned char dstatus;
 385         struct  async_icount *icount;
 386
 387         /* Determine bits that have changed */
 388         dstatus = status ^ current_ctl_bits;
 389         current_ctl_bits = status;
 390
 391         if (dstatus) {
 392                 icount = &info->icount;
 393                 /* update input line counters */
 394                 if (dstatus & SER_DSR)
 395                         icount->dsr++;
 396                 if (dstatus & SER_DCD) {
 397                         icount->dcd++;
 398 #ifdef CONFIG_HARD_PPS
 399                         if ((port->flags & ASYNC_HARDPPS_CD) &&
 400                             !(status & SER_DCD))
 401                                 hardpps();
 402 #endif
 403                 }
 404                 if (dstatus & SER_CTS)
 405                         icount->cts++;
 406                 wake_up_interruptible(&port->delta_msr_wait);
 407         }
 408
 409         if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
 410 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
 411                 printk("ttyS%d CD now %s...", info->line,
 412                        (!(status & SER_DCD)) ? "on" : "off");
 413 #endif
 414                 if (!(status & SER_DCD))
 415                         wake_up_interruptible(&port->open_wait);
 416                 else {
 417 #ifdef SERIAL_DEBUG_OPEN
 418                         printk("doing serial hangup...");
 419 #endif
 420                         if (port->tty)
 421                                 tty_hangup(port->tty);
 422                 }
 423         }
 424         if (port->flags & ASYNC_CTS_FLOW) {
 425                 if (port->tty->hw_stopped) {
 426                         if (!(status & SER_CTS)) {
 427 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 428                                 printk("CTS tx start...");
 429 #endif
 430                                 port->tty->hw_stopped = 0;
 431                                 info->IER |= UART_IER_THRI;
 432                                 custom.intena = IF_SETCLR | IF_TBE;
 433                                 mb();
 434                                 /* set a pending Tx Interrupt, transmitter should restart now */
 435                                 custom.intreq = IF_SETCLR | IF_TBE;
 436                                 mb();
 437                                 tty_wakeup(port->tty);
 438                                 return;
 439                         }
 440                 } else {
 441                         if ((status & SER_CTS)) {
 442 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 443                                 printk("CTS tx stop...");
 444 #endif
 445                                 port->tty->hw_stopped = 1;
 446                                 info->IER &= ~UART_IER_THRI;
 447                                 /* disable Tx interrupt and remove any pending interrupts */
 448                                 custom.intena = IF_TBE;
 449                                 mb();
 450                                 custom.intreq = IF_TBE;
 451                                 mb();
 452                         }
 453                 }
 454         }
 455 }
 456
 457 static irqreturn_t ser_vbl_int( int irq, void *data)
 458 {
 459         /* vbl is just a periodic interrupt we tie into to update modem status */
 460         struct serial_state *info = data;
 461         /*
 462          * TBD - is it better to unregister from this interrupt or to
 463          * ignore it if MSI is clear ?
 464          */
 465         if(info->IER & UART_IER_MSI)
 466           check_modem_status(info);
 467         return IRQ_HANDLED;
 468 }
 469
 470 static irqreturn_t ser_rx_int(int irq, void *dev_id)
 471 {
 472         struct serial_state *info = dev_id;
 473
 474 #ifdef SERIAL_DEBUG_INTR
 475         printk("ser_rx_int...");
 476 #endif
 477
 478         if (!info->tport.tty)
 479                 return IRQ_NONE;
 480
 481         receive_chars(info);
 482 #ifdef SERIAL_DEBUG_INTR
 483         printk("end.\n");
 484 #endif
 485         return IRQ_HANDLED;
 486 }
 487
 488 static irqreturn_t ser_tx_int(int irq, void *dev_id)
 489 {
 490         struct serial_state *info = dev_id;
 491
 492         if (custom.serdatr & SDR_TBE) {
 493 #ifdef SERIAL_DEBUG_INTR
 494           printk("ser_tx_int...");
 495 #endif
 496
 497           if (!info->tport.tty)
 498                 return IRQ_NONE;
 499
 500           transmit_chars(info);
 501 #ifdef SERIAL_DEBUG_INTR
 502           printk("end.\n");
 503 #endif
 504         }
 505         return IRQ_HANDLED;
 506 }
 507
 508 /*
 509  * -------------------------------------------------------------------
 510  * Here ends the serial interrupt routines.
 511  * -------------------------------------------------------------------
 512  */
 513
 514 /*
 515  * ---------------------------------------------------------------
 516  * Low level utility subroutines for the serial driver:  routines to
 517  * figure out the appropriate timeout for an interrupt chain, routines
 518  * to initialize and startup a serial port, and routines to shutdown a
 519  * serial port.  Useful stuff like that.
 520  * ---------------------------------------------------------------
 521  */
 522
 523 static int startup(struct tty_struct *tty, struct serial_state *info)
 524 {
 525         struct tty_port *port = &info->tport;
 526         unsigned long flags;
 527         int     retval=0;
 528         unsigned long page;
 529
 530         page = get_zeroed_page(GFP_KERNEL);
 531         if (!page)
 532                 return -ENOMEM;
 533
 534         local_irq_save(flags);
 535
 536         if (port->flags & ASYNC_INITIALIZED) {
 537                 free_page(page);
 538                 goto errout;
 539         }
 540
 541         if (info->xmit.buf)
 542                 free_page(page);
 543         else
 544                 info->xmit.buf = (unsigned char *) page;
 545
 546 #ifdef SERIAL_DEBUG_OPEN
 547         printk("starting up ttys%d ...", info->line);
 548 #endif
 549
 550         /* Clear anything in the input buffer */
 551
 552         custom.intreq = IF_RBF;
 553         mb();
 554
 555         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
 556         if (retval) {
 557           if (serial_isroot()) {
 558               set_bit(TTY_IO_ERROR, &tty->flags);
 559             retval = 0;
 560           }
 561           goto errout;
 562         }
 563
 564         /* enable both Rx and Tx interrupts */
 565         custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
 566         mb();
 567         info->IER = UART_IER_MSI;
 568
 569         /* remember current state of the DCD and CTS bits */
 570         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 571
 572         info->MCR = 0;
 573         if (C_BAUD(tty))
 574           info->MCR = SER_DTR | SER_RTS;
 575         rtsdtr_ctrl(info->MCR);
 576
 577         clear_bit(TTY_IO_ERROR, &tty->flags);
 578         info->xmit.head = info->xmit.tail = 0;
 579
 580         /*
 581          * Set up the tty->alt_speed kludge
 582          */
 583         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 584                 tty->alt_speed = 57600;
 585         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 586                 tty->alt_speed = 115200;
 587         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 588                 tty->alt_speed = 230400;
 589         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 590                 tty->alt_speed = 460800;
 591
 592         /*
 593          * and set the speed of the serial port
 594          */
 595         change_speed(tty, info, NULL);
 596
 597         port->flags |= ASYNC_INITIALIZED;
 598         local_irq_restore(flags);
 599         return 0;
 600
 601 errout:
 602         local_irq_restore(flags);
 603         return retval;
 604 }
 605
 606 /*
 607  * This routine will shutdown a serial port; interrupts are disabled, and
 608  * DTR is dropped if the hangup on close termio flag is on.
 609  */
 610 static void shutdown(struct tty_struct *tty, struct serial_state *info)
 611 {
 612         unsigned long   flags;
 613         struct serial_state *state;
 614
 615         if (!(info->tport.flags & ASYNC_INITIALIZED))
 616                 return;
 617
 618         state = info;
 619
 620 #ifdef SERIAL_DEBUG_OPEN
 621         printk("Shutting down serial port %d ....\n", info->line);
 622 #endif
 623
 624         local_irq_save(flags); /* Disable interrupts */
 625
 626         /*
 627          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 628          * here so the queue might never be waken up
 629          */
 630         wake_up_interruptible(&info->tport.delta_msr_wait);
 631
 632         /*
 633          * Free the IRQ, if necessary
 634          */
 635         free_irq(IRQ_AMIGA_VERTB, info);
 636
 637         if (info->xmit.buf) {
 638                 free_page((unsigned long) info->xmit.buf);
 639                 info->xmit.buf = NULL;
 640         }
 641
 642         info->IER = 0;
 643         custom.intena = IF_RBF | IF_TBE;
 644         mb();
 645
 646         /* disable break condition */
 647         custom.adkcon = AC_UARTBRK;
 648         mb();
 649
 650         if (tty->termios->c_cflag & HUPCL)
 651                 info->MCR &= ~(SER_DTR|SER_RTS);
 652         rtsdtr_ctrl(info->MCR);
 653
 654         set_bit(TTY_IO_ERROR, &tty->flags);
 655
 656         info->tport.flags &= ~ASYNC_INITIALIZED;
 657         local_irq_restore(flags);
 658 }
 659
 660
 661 /*
 662  * This routine is called to set the UART divisor registers to match
 663  * the specified baud rate for a serial port.
 664  */
 665 static void change_speed(struct tty_struct *tty, struct serial_state *info,
 666                          struct ktermios *old_termios)
 667 {
 668         struct tty_port *port = &info->tport;
 669         int     quot = 0, baud_base, baud;
 670         unsigned cflag, cval = 0;
 671         int     bits;
 672         unsigned long   flags;
 673
 674         cflag = tty->termios->c_cflag;
 675
 676         /* Byte size is always 8 bits plus parity bit if requested */
 677
 678         cval = 3; bits = 10;
 679         if (cflag & CSTOPB) {
 680                 cval |= 0x04;
 681                 bits++;
 682         }
 683         if (cflag & PARENB) {
 684                 cval |= UART_LCR_PARITY;
 685                 bits++;
 686         }
 687         if (!(cflag & PARODD))
 688                 cval |= UART_LCR_EPAR;
 689 #ifdef CMSPAR
 690         if (cflag & CMSPAR)
 691                 cval |= UART_LCR_SPAR;
 692 #endif
 693
 694         /* Determine divisor based on baud rate */
 695         baud = tty_get_baud_rate(tty);
 696         if (!baud)
 697                 baud = 9600;    /* B0 transition handled in rs_set_termios */
 698         baud_base = info->baud_base;
 699         if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 700                 quot = info->custom_divisor;
 701         else {
 702                 if (baud == 134)
 703                         /* Special case since 134 is really 134.5 */
 704                         quot = (2*baud_base / 269);
 705                 else if (baud)
 706                         quot = baud_base / baud;
 707         }
 708         /* If the quotient is zero refuse the change */
 709         if (!quot && old_termios) {
 710                 /* FIXME: Will need updating for new tty in the end */
 711                 tty->termios->c_cflag &= ~CBAUD;
 712                 tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
 713                 baud = tty_get_baud_rate(tty);
 714                 if (!baud)
 715                         baud = 9600;
 716                 if (baud == 38400 &&
 717                     (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 718                         quot = info->custom_divisor;
 719                 else {
 720                         if (baud == 134)
 721                                 /* Special case since 134 is really 134.5 */
 722                                 quot = (2*baud_base / 269);
 723                         else if (baud)
 724                                 quot = baud_base / baud;
 725                 }
 726         }
 727         /* As a last resort, if the quotient is zero, default to 9600 bps */
 728         if (!quot)
 729                 quot = baud_base / 9600;
 730         info->quot = quot;
 731         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
 732         info->timeout += HZ/50;         /* Add .02 seconds of slop */
 733
 734         /* CTS flow control flag and modem status interrupts */
 735         info->IER &= ~UART_IER_MSI;
 736         if (port->flags & ASYNC_HARDPPS_CD)
 737                 info->IER |= UART_IER_MSI;
 738         if (cflag & CRTSCTS) {
 739                 port->flags |= ASYNC_CTS_FLOW;
 740                 info->IER |= UART_IER_MSI;
 741         } else
 742                 port->flags &= ~ASYNC_CTS_FLOW;
 743         if (cflag & CLOCAL)
 744                 port->flags &= ~ASYNC_CHECK_CD;
 745         else {
 746                 port->flags |= ASYNC_CHECK_CD;
 747                 info->IER |= UART_IER_MSI;
 748         }
 749         /* TBD:
 750          * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
 751          */
 752
 753         /*
 754          * Set up parity check flag
 755          */
 756
 757         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
 758         if (I_INPCK(tty))
 759                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 760         if (I_BRKINT(tty) || I_PARMRK(tty))
 761                 info->read_status_mask |= UART_LSR_BI;
 762
 763         /*
 764          * Characters to ignore
 765          */
 766         info->ignore_status_mask = 0;
 767         if (I_IGNPAR(tty))
 768                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 769         if (I_IGNBRK(tty)) {
 770                 info->ignore_status_mask |= UART_LSR_BI;
 771                 /*
 772                  * If we're ignore parity and break indicators, ignore
 773                  * overruns too.  (For real raw support).
 774                  */
 775                 if (I_IGNPAR(tty))
 776                         info->ignore_status_mask |= UART_LSR_OE;
 777         }
 778         /*
 779          * !!! ignore all characters if CREAD is not set
 780          */
 781         if ((cflag & CREAD) == 0)
 782                 info->ignore_status_mask |= UART_LSR_DR;
 783         local_irq_save(flags);
 784
 785         {
 786           short serper;
 787
 788         /* Set up the baud rate */
 789           serper = quot - 1;
 790
 791         /* Enable or disable parity bit */
 792
 793         if(cval & UART_LCR_PARITY)
 794           serper |= (SERPER_PARENB);
 795
 796         custom.serper = serper;
 797         mb();
 798         }
 799
 800         local_irq_restore(flags);
 801 }
 802
 803 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 804 {
 805         struct serial_state *info;
 806         unsigned long flags;
 807
 808         info = tty->driver_data;
 809
 810         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
 811                 return 0;
 812
 813         if (!info->xmit.buf)
 814                 return 0;
 815
 816         local_irq_save(flags);
 817         if (CIRC_SPACE(info->xmit.head,
 818                        info->xmit.tail,
 819                        SERIAL_XMIT_SIZE) == 0) {
 820                 local_irq_restore(flags);
 821                 return 0;
 822         }
 823
 824         info->xmit.buf[info->xmit.head++] = ch;
 825         info->xmit.head &= SERIAL_XMIT_SIZE-1;
 826         local_irq_restore(flags);
 827         return 1;
 828 }
 829
 830 static void rs_flush_chars(struct tty_struct *tty)
 831 {
 832         struct serial_state *info = tty->driver_data;
 833         unsigned long flags;
 834
 835         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 836                 return;
 837
 838         if (info->xmit.head == info->xmit.tail
 839             || tty->stopped
 840             || tty->hw_stopped
 841             || !info->xmit.buf)
 842                 return;
 843
 844         local_irq_save(flags);
 845         info->IER |= UART_IER_THRI;
 846         custom.intena = IF_SETCLR | IF_TBE;
 847         mb();
 848         /* set a pending Tx Interrupt, transmitter should restart now */
 849         custom.intreq = IF_SETCLR | IF_TBE;
 850         mb();
 851         local_irq_restore(flags);
 852 }
 853
 854 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
 855 {
 856         int     c, ret = 0;
 857         struct serial_state *info = tty->driver_data;
 858         unsigned long flags;
 859
 860         if (serial_paranoia_check(info, tty->name, "rs_write"))
 861                 return 0;
 862
 863         if (!info->xmit.buf)
 864                 return 0;
 865
 866         local_irq_save(flags);
 867         while (1) {
 868                 c = CIRC_SPACE_TO_END(info->xmit.head,
 869                                       info->xmit.tail,
 870                                       SERIAL_XMIT_SIZE);
 871                 if (count < c)
 872                         c = count;
 873                 if (c <= 0) {
 874                         break;
 875                 }
 876                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 877                 info->xmit.head = ((info->xmit.head + c) &
 878                                    (SERIAL_XMIT_SIZE-1));
 879                 buf += c;
 880                 count -= c;
 881                 ret += c;
 882         }
 883         local_irq_restore(flags);
 884
 885         if (info->xmit.head != info->xmit.tail
 886             && !tty->stopped
 887             && !tty->hw_stopped
 888             && !(info->IER & UART_IER_THRI)) {
 889                 info->IER |= UART_IER_THRI;
 890                 local_irq_disable();
 891                 custom.intena = IF_SETCLR | IF_TBE;
 892                 mb();
 893                 /* set a pending Tx Interrupt, transmitter should restart now */
 894                 custom.intreq = IF_SETCLR | IF_TBE;
 895                 mb();
 896                 local_irq_restore(flags);
 897         }
 898         return ret;
 899 }
 900
 901 static int rs_write_room(struct tty_struct *tty)
 902 {
 903         struct serial_state *info = tty->driver_data;
 904
 905         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 906                 return 0;
 907         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 908 }
 909
 910 static int rs_chars_in_buffer(struct tty_struct *tty)
 911 {
 912         struct serial_state *info = tty->driver_data;
 913
 914         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 915                 return 0;
 916         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 917 }
 918
 919 static void rs_flush_buffer(struct tty_struct *tty)
 920 {
 921         struct serial_state *info = tty->driver_data;
 922         unsigned long flags;
 923
 924         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 925                 return;
 926         local_irq_save(flags);
 927         info->xmit.head = info->xmit.tail = 0;
 928         local_irq_restore(flags);
 929         tty_wakeup(tty);
 930 }
 931
 932 /*
 933  * This function is used to send a high-priority XON/XOFF character to
 934  * the device
 935  */
 936 static void rs_send_xchar(struct tty_struct *tty, char ch)
 937 {
 938         struct serial_state *info = tty->driver_data;
 939         unsigned long flags;
 940
 941         if (serial_paranoia_check(info, tty->name, "rs_send_char"))
 942                 return;
 943
 944         info->x_char = ch;
 945         if (ch) {
 946                 /* Make sure transmit interrupts are on */
 947
 948                 /* Check this ! */
 949                 local_irq_save(flags);
 950                 if(!(custom.intenar & IF_TBE)) {
 951                     custom.intena = IF_SETCLR | IF_TBE;
 952                     mb();
 953                     /* set a pending Tx Interrupt, transmitter should restart now */
 954                     custom.intreq = IF_SETCLR | IF_TBE;
 955                     mb();
 956                 }
 957                 local_irq_restore(flags);
 958
 959                 info->IER |= UART_IER_THRI;
 960         }
 961 }
 962
 963 /*
 964  * ------------------------------------------------------------
 965  * rs_throttle()
 966  *
 967  * This routine is called by the upper-layer tty layer to signal that
 968  * incoming characters should be throttled.
 969  * ------------------------------------------------------------
 970  */
 971 static void rs_throttle(struct tty_struct * tty)
 972 {
 973         struct serial_state *info = tty->driver_data;
 974         unsigned long flags;
 975 #ifdef SERIAL_DEBUG_THROTTLE
 976         char    buf[64];
 977
 978         printk("throttle %s: %d....\n", tty_name(tty, buf),
 979                tty->ldisc.chars_in_buffer(tty));
 980 #endif
 981
 982         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 983                 return;
 984
 985         if (I_IXOFF(tty))
 986                 rs_send_xchar(tty, STOP_CHAR(tty));
 987
 988         if (tty->termios->c_cflag & CRTSCTS)
 989                 info->MCR &= ~SER_RTS;
 990
 991         local_irq_save(flags);
 992         rtsdtr_ctrl(info->MCR);
 993         local_irq_restore(flags);
 994 }
 995
 996 static void rs_unthrottle(struct tty_struct * tty)
 997 {
 998         struct serial_state *info = tty->driver_data;
 999         unsigned long flags;
1000 #ifdef SERIAL_DEBUG_THROTTLE
1001         char    buf[64];
1002
1003         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1004                tty->ldisc.chars_in_buffer(tty));
1005 #endif
1006
1007         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1008                 return;
1009
1010         if (I_IXOFF(tty)) {
1011                 if (info->x_char)
1012                         info->x_char = 0;
1013                 else
1014                         rs_send_xchar(tty, START_CHAR(tty));
1015         }
1016         if (tty->termios->c_cflag & CRTSCTS)
1017                 info->MCR |= SER_RTS;
1018         local_irq_save(flags);
1019         rtsdtr_ctrl(info->MCR);
1020         local_irq_restore(flags);
1021 }
1022
1023 /*
1024  * ------------------------------------------------------------
1025  * rs_ioctl() and friends
1026  * ------------------------------------------------------------
1027  */
1028
1029 static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
1030                            struct serial_struct __user * retinfo)
1031 {
1032         struct serial_struct tmp;
1033
1034         if (!retinfo)
1035                 return -EFAULT;
1036         memset(&tmp, 0, sizeof(tmp));
1037         tty_lock();
1038         tmp.line = tty->index;
1039         tmp.port = state->port;
1040         tmp.flags = state->tport.flags;
1041         tmp.xmit_fifo_size = state->xmit_fifo_size;
1042         tmp.baud_base = state->baud_base;
1043         tmp.close_delay = state->tport.close_delay;
1044         tmp.closing_wait = state->tport.closing_wait;
1045         tmp.custom_divisor = state->custom_divisor;
1046         tty_unlock();
1047         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1048                 return -EFAULT;
1049         return 0;
1050 }
1051
1052 static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
1053                            struct serial_struct __user * new_info)
1054 {
1055         struct tty_port *port = &state->tport;
1056         struct serial_struct new_serial;
1057         bool change_spd;
1058         int                     retval = 0;
1059
1060         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1061                 return -EFAULT;
1062
1063         tty_lock();
1064         change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
1065                 new_serial.custom_divisor != state->custom_divisor;
1066         if (new_serial.irq || new_serial.port != state->port ||
1067                         new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1068                 tty_unlock();
1069                 return -EINVAL;
1070         }
1071
1072         if (!serial_isroot()) {
1073                 if ((new_serial.baud_base != state->baud_base) ||
1074                     (new_serial.close_delay != port->close_delay) ||
1075                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1076                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1077                      (port->flags & ~ASYNC_USR_MASK)))
1078                         return -EPERM;
1079                 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1080                                (new_serial.flags & ASYNC_USR_MASK));
1081                 state->custom_divisor = new_serial.custom_divisor;
1082                 goto check_and_exit;
1083         }
1084
1085         if (new_serial.baud_base < 9600) {
1086                 tty_unlock();
1087                 return -EINVAL;
1088         }
1089
1090         /*
1091          * OK, past this point, all the error checking has been done.
1092          * At this point, we start making changes.....
1093          */
1094
1095         state->baud_base = new_serial.baud_base;
1096         port->flags = ((port->flags & ~ASYNC_FLAGS) |
1097                         (new_serial.flags & ASYNC_FLAGS));
1098         state->custom_divisor = new_serial.custom_divisor;
1099         port->close_delay = new_serial.close_delay * HZ/100;
1100         port->closing_wait = new_serial.closing_wait * HZ/100;
1101         tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1102
1103 check_and_exit:
1104         if (port->flags & ASYNC_INITIALIZED) {
1105                 if (change_spd) {
1106                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1107                                 tty->alt_speed = 57600;
1108                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1109                                 tty->alt_speed = 115200;
1110                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1111                                 tty->alt_speed = 230400;
1112                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1113                                 tty->alt_speed = 460800;
1114                         change_speed(tty, state, NULL);
1115                 }
1116         } else
1117                 retval = startup(tty, state);
1118         tty_unlock();
1119         return retval;
1120 }
1121
1122
1123 /*
1124  * get_lsr_info - get line status register info
1125  *
1126  * Purpose: Let user call ioctl() to get info when the UART physically
1127  *          is emptied.  On bus types like RS485, the transmitter must
1128  *          release the bus after transmitting. This must be done when
1129  *          the transmit shift register is empty, not be done when the
1130  *          transmit holding register is empty.  This functionality
1131  *          allows an RS485 driver to be written in user space.
1132  */
1133 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1134 {
1135         unsigned char status;
1136         unsigned int result;
1137         unsigned long flags;
1138
1139         local_irq_save(flags);
1140         status = custom.serdatr;
1141         mb();
1142         local_irq_restore(flags);
1143         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1144         if (copy_to_user(value, &result, sizeof(int)))
1145                 return -EFAULT;
1146         return 0;
1147 }
1148
1149
1150 static int rs_tiocmget(struct tty_struct *tty)
1151 {
1152         struct serial_state *info = tty->driver_data;
1153         unsigned char control, status;
1154         unsigned long flags;
1155
1156         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1157                 return -ENODEV;
1158         if (tty->flags & (1 << TTY_IO_ERROR))
1159                 return -EIO;
1160
1161         control = info->MCR;
1162         local_irq_save(flags);
1163         status = ciab.pra;
1164         local_irq_restore(flags);
1165         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1166                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1167                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1168                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1169                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1170 }
1171
1172 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1173                                                 unsigned int clear)
1174 {
1175         struct serial_state *info = tty->driver_data;
1176         unsigned long flags;
1177
1178         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1179                 return -ENODEV;
1180         if (tty->flags & (1 << TTY_IO_ERROR))
1181                 return -EIO;
1182
1183         local_irq_save(flags);
1184         if (set & TIOCM_RTS)
1185                 info->MCR |= SER_RTS;
1186         if (set & TIOCM_DTR)
1187                 info->MCR |= SER_DTR;
1188         if (clear & TIOCM_RTS)
1189                 info->MCR &= ~SER_RTS;
1190         if (clear & TIOCM_DTR)
1191                 info->MCR &= ~SER_DTR;
1192         rtsdtr_ctrl(info->MCR);
1193         local_irq_restore(flags);
1194         return 0;
1195 }
1196
1197 /*
1198  * rs_break() --- routine which turns the break handling on or off
1199  */
1200 static int rs_break(struct tty_struct *tty, int break_state)
1201 {
1202         struct serial_state *info = tty->driver_data;
1203         unsigned long flags;
1204
1205         if (serial_paranoia_check(info, tty->name, "rs_break"))
1206                 return -EINVAL;
1207
1208         local_irq_save(flags);
1209         if (break_state == -1)
1210           custom.adkcon = AC_SETCLR | AC_UARTBRK;
1211         else
1212           custom.adkcon = AC_UARTBRK;
1213         mb();
1214         local_irq_restore(flags);
1215         return 0;
1216 }
1217
1218 /*
1219  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1220  * Return: write counters to the user passed counter struct
1221  * NB: both 1->0 and 0->1 transitions are counted except for
1222  *     RI where only 0->1 is counted.
1223  */
1224 static int rs_get_icount(struct tty_struct *tty,
1225                                 struct serial_icounter_struct *icount)
1226 {
1227         struct serial_state *info = tty->driver_data;
1228         struct async_icount cnow;
1229         unsigned long flags;
1230
1231         local_irq_save(flags);
1232         cnow = info->icount;
1233         local_irq_restore(flags);
1234         icount->cts = cnow.cts;
1235         icount->dsr = cnow.dsr;
1236         icount->rng = cnow.rng;
1237         icount->dcd = cnow.dcd;
1238         icount->rx = cnow.rx;
1239         icount->tx = cnow.tx;
1240         icount->frame = cnow.frame;
1241         icount->overrun = cnow.overrun;
1242         icount->parity = cnow.parity;
1243         icount->brk = cnow.brk;
1244         icount->buf_overrun = cnow.buf_overrun;
1245
1246         return 0;
1247 }
1248
1249 static int rs_ioctl(struct tty_struct *tty,
1250                     unsigned int cmd, unsigned long arg)
1251 {
1252         struct serial_state *info = tty->driver_data;
1253         struct async_icount cprev, cnow;        /* kernel counter temps */
1254         void __user *argp = (void __user *)arg;
1255         unsigned long flags;
1256
1257         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1258                 return -ENODEV;
1259
1260         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1261             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1262             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1263                 if (tty->flags & (1 << TTY_IO_ERROR))
1264                     return -EIO;
1265         }
1266
1267         switch (cmd) {
1268                 case TIOCGSERIAL:
1269                         return get_serial_info(tty, info, argp);
1270                 case TIOCSSERIAL:
1271                         return set_serial_info(tty, info, argp);
1272                 case TIOCSERCONFIG:
1273                         return 0;
1274
1275                 case TIOCSERGETLSR: /* Get line status register */
1276                         return get_lsr_info(info, argp);
1277
1278                 case TIOCSERGSTRUCT:
1279                         if (copy_to_user(argp,
1280                                          info, sizeof(struct serial_state)))
1281                                 return -EFAULT;
1282                         return 0;
1283
1284                 /*
1285                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1286                  * - mask passed in arg for lines of interest
1287                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1288                  * Caller should use TIOCGICOUNT to see which one it was
1289                  */
1290                 case TIOCMIWAIT:
1291                         local_irq_save(flags);
1292                         /* note the counters on entry */
1293                         cprev = info->icount;
1294                         local_irq_restore(flags);
1295                         while (1) {
1296                                 interruptible_sleep_on(&info->tport.delta_msr_wait);
1297                                 /* see if a signal did it */
1298                                 if (signal_pending(current))
1299                                         return -ERESTARTSYS;
1300                                 local_irq_save(flags);
1301                                 cnow = info->icount; /* atomic copy */
1302                                 local_irq_restore(flags);
1303                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1304                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1305                                         return -EIO; /* no change => error */
1306                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1307                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1308                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1309                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1310                                         return 0;
1311                                 }
1312                                 cprev = cnow;
1313                         }
1314                         /* NOTREACHED */
1315
1316                 case TIOCSERGWILD:
1317                 case TIOCSERSWILD:
1318                         /* "setserial -W" is called in Debian boot */
1319                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1320                         return 0;
1321
1322                 default:
1323                         return -ENOIOCTLCMD;
1324                 }
1325         return 0;
1326 }
1327
1328 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1329 {
1330         struct serial_state *info = tty->driver_data;
1331         unsigned long flags;
1332         unsigned int cflag = tty->termios->c_cflag;
1333
1334         change_speed(tty, info, old_termios);
1335
1336         /* Handle transition to B0 status */
1337         if ((old_termios->c_cflag & CBAUD) &&
1338             !(cflag & CBAUD)) {
1339                 info->MCR &= ~(SER_DTR|SER_RTS);
1340                 local_irq_save(flags);
1341                 rtsdtr_ctrl(info->MCR);
1342                 local_irq_restore(flags);
1343         }
1344
1345         /* Handle transition away from B0 status */
1346         if (!(old_termios->c_cflag & CBAUD) &&
1347             (cflag & CBAUD)) {
1348                 info->MCR |= SER_DTR;
1349                 if (!(tty->termios->c_cflag & CRTSCTS) ||
1350                     !test_bit(TTY_THROTTLED, &tty->flags)) {
1351                         info->MCR |= SER_RTS;
1352                 }
1353                 local_irq_save(flags);
1354                 rtsdtr_ctrl(info->MCR);
1355                 local_irq_restore(flags);
1356         }
1357
1358         /* Handle turning off CRTSCTS */
1359         if ((old_termios->c_cflag & CRTSCTS) &&
1360             !(tty->termios->c_cflag & CRTSCTS)) {
1361                 tty->hw_stopped = 0;
1362                 rs_start(tty);
1363         }
1364
1365 #if 0
1366         /*
1367          * No need to wake up processes in open wait, since they
1368          * sample the CLOCAL flag once, and don't recheck it.
1369          * XXX  It's not clear whether the current behavior is correct
1370          * or not.  Hence, this may change.....
1371          */
1372         if (!(old_termios->c_cflag & CLOCAL) &&
1373             (tty->termios->c_cflag & CLOCAL))
1374                 wake_up_interruptible(&info->open_wait);
1375 #endif
1376 }
1377
1378 /*
1379  * ------------------------------------------------------------
1380  * rs_close()
1381  *
1382  * This routine is called when the serial port gets closed.  First, we
1383  * wait for the last remaining data to be sent.  Then, we unlink its
1384  * async structure from the interrupt chain if necessary, and we free
1385  * that IRQ if nothing is left in the chain.
1386  * ------------------------------------------------------------
1387  */
1388 static void rs_close(struct tty_struct *tty, struct file * filp)
1389 {
1390         struct serial_state *state = tty->driver_data;
1391         struct tty_port *port = &state->tport;
1392
1393         if (serial_paranoia_check(state, tty->name, "rs_close"))
1394                 return;
1395
1396         if (tty_port_close_start(port, tty, filp) == 0)
1397                 return;
1398
1399         /*
1400          * At this point we stop accepting input.  To do this, we
1401          * disable the receive line status interrupts, and tell the
1402          * interrupt driver to stop checking the data ready bit in the
1403          * line status register.
1404          */
1405         state->read_status_mask &= ~UART_LSR_DR;
1406         if (port->flags & ASYNC_INITIALIZED) {
1407                 /* disable receive interrupts */
1408                 custom.intena = IF_RBF;
1409                 mb();
1410                 /* clear any pending receive interrupt */
1411                 custom.intreq = IF_RBF;
1412                 mb();
1413
1414                 /*
1415                  * Before we drop DTR, make sure the UART transmitter
1416                  * has completely drained; this is especially
1417                  * important if there is a transmit FIFO!
1418                  */
1419                 rs_wait_until_sent(tty, state->timeout);
1420         }
1421         shutdown(tty, state);
1422         rs_flush_buffer(tty);
1423
1424         tty_ldisc_flush(tty);
1425         port->tty = NULL;
1426
1427         tty_port_close_end(port, tty);
1428 }
1429
1430 /*
1431  * rs_wait_until_sent() --- wait until the transmitter is empty
1432  */
1433 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1434 {
1435         struct serial_state *info = tty->driver_data;
1436         unsigned long orig_jiffies, char_time;
1437         int lsr;
1438
1439         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1440                 return;
1441
1442         if (info->xmit_fifo_size == 0)
1443                 return; /* Just in case.... */
1444
1445         orig_jiffies = jiffies;
1446
1447         /*
1448          * Set the check interval to be 1/5 of the estimated time to
1449          * send a single character, and make it at least 1.  The check
1450          * interval should also be less than the timeout.
1451          *
1452          * Note: we have to use pretty tight timings here to satisfy
1453          * the NIST-PCTS.
1454          */
1455         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1456         char_time = char_time / 5;
1457         if (char_time == 0)
1458                 char_time = 1;
1459         if (timeout)
1460           char_time = min_t(unsigned long, char_time, timeout);
1461         /*
1462          * If the transmitter hasn't cleared in twice the approximate
1463          * amount of time to send the entire FIFO, it probably won't
1464          * ever clear.  This assumes the UART isn't doing flow
1465          * control, which is currently the case.  Hence, if it ever
1466          * takes longer than info->timeout, this is probably due to a
1467          * UART bug of some kind.  So, we clamp the timeout parameter at
1468          * 2*info->timeout.
1469          */
1470         if (!timeout || timeout > 2*info->timeout)
1471                 timeout = 2*info->timeout;
1472 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1473         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1474         printk("jiff=%lu...", jiffies);
1475 #endif
1476         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1477 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1478                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1479 #endif
1480                 msleep_interruptible(jiffies_to_msecs(char_time));
1481                 if (signal_pending(current))
1482                         break;
1483                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1484                         break;
1485         }
1486         __set_current_state(TASK_RUNNING);
1487
1488 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1489         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1490 #endif
1491 }
1492
1493 /*
1494  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1495  */
1496 static void rs_hangup(struct tty_struct *tty)
1497 {
1498         struct serial_state *info = tty->driver_data;
1499
1500         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1501                 return;
1502
1503         rs_flush_buffer(tty);
1504         shutdown(tty, info);
1505         info->tport.count = 0;
1506         info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
1507         info->tport.tty = NULL;
1508         wake_up_interruptible(&info->tport.open_wait);
1509 }
1510
1511 /*
1512  * This routine is called whenever a serial port is opened.  It
1513  * enables interrupts for a serial port, linking in its async structure into
1514  * the IRQ chain.   It also performs the serial-specific
1515  * initialization for the tty structure.
1516  */
1517 static int rs_open(struct tty_struct *tty, struct file * filp)
1518 {
1519         struct serial_state *info = rs_table + tty->index;
1520         struct tty_port *port = &info->tport;
1521         int retval;
1522
1523         port->count++;
1524         port->tty = tty;
1525         tty->driver_data = info;
1526         tty->port = port;
1527         if (serial_paranoia_check(info, tty->name, "rs_open"))
1528                 return -ENODEV;
1529
1530         tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1531
1532         retval = startup(tty, info);
1533         if (retval) {
1534                 return retval;
1535         }
1536
1537         return tty_port_block_til_ready(port, tty, filp);
1538 }
1539
1540 /*
1541  * /proc fs routines....
1542  */
1543
1544 static inline void line_info(struct seq_file *m, int line,
1545                 struct serial_state *state)
1546 {
1547         char    stat_buf[30], control, status;
1548         unsigned long flags;
1549
1550         seq_printf(m, "%d: uart:amiga_builtin", line);
1551
1552         local_irq_save(flags);
1553         status = ciab.pra;
1554         control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status;
1555         local_irq_restore(flags);
1556
1557         stat_buf[0] = 0;
1558         stat_buf[1] = 0;
1559         if(!(control & SER_RTS))
1560                 strcat(stat_buf, "|RTS");
1561         if(!(status & SER_CTS))
1562                 strcat(stat_buf, "|CTS");
1563         if(!(control & SER_DTR))
1564                 strcat(stat_buf, "|DTR");
1565         if(!(status & SER_DSR))
1566                 strcat(stat_buf, "|DSR");
1567         if(!(status & SER_DCD))
1568                 strcat(stat_buf, "|CD");
1569
1570         if (state->quot)
1571                 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1572
1573         seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1574
1575         if (state->icount.frame)
1576                 seq_printf(m, " fe:%d", state->icount.frame);
1577
1578         if (state->icount.parity)
1579                 seq_printf(m, " pe:%d", state->icount.parity);
1580
1581         if (state->icount.brk)
1582                 seq_printf(m, " brk:%d", state->icount.brk);
1583
1584         if (state->icount.overrun)
1585                 seq_printf(m, " oe:%d", state->icount.overrun);
1586
1587         /*
1588          * Last thing is the RS-232 status lines
1589          */
1590         seq_printf(m, " %s\n", stat_buf+1);
1591 }
1592
1593 static int rs_proc_show(struct seq_file *m, void *v)
1594 {
1595         seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1596         line_info(m, 0, &rs_table[0]);
1597         return 0;
1598 }
1599
1600 static int rs_proc_open(struct inode *inode, struct file *file)
1601 {
1602         return single_open(file, rs_proc_show, NULL);
1603 }
1604
1605 static const struct file_operations rs_proc_fops = {
1606         .owner          = THIS_MODULE,
1607         .open           = rs_proc_open,
1608         .read           = seq_read,
1609         .llseek         = seq_lseek,
1610         .release        = single_release,
1611 };
1612
1613 /*
1614  * ---------------------------------------------------------------------
1615  * rs_init() and friends
1616  *
1617  * rs_init() is called at boot-time to initialize the serial driver.
1618  * ---------------------------------------------------------------------
1619  */
1620
1621 /*
1622  * This routine prints out the appropriate serial driver version
1623  * number, and identifies which options were configured into this
1624  * driver.
1625  */
1626 static void show_serial_version(void)
1627 {
1628         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1629 }
1630
1631
1632 static const struct tty_operations serial_ops = {
1633         .open = rs_open,
1634         .close = rs_close,
1635         .write = rs_write,
1636         .put_char = rs_put_char,
1637         .flush_chars = rs_flush_chars,
1638         .write_room = rs_write_room,
1639         .chars_in_buffer = rs_chars_in_buffer,
1640         .flush_buffer = rs_flush_buffer,
1641         .ioctl = rs_ioctl,
1642         .throttle = rs_throttle,
1643         .unthrottle = rs_unthrottle,
1644         .set_termios = rs_set_termios,
1645         .stop = rs_stop,
1646         .start = rs_start,
1647         .hangup = rs_hangup,
1648         .break_ctl = rs_break,
1649         .send_xchar = rs_send_xchar,
1650         .wait_until_sent = rs_wait_until_sent,
1651         .tiocmget = rs_tiocmget,
1652         .tiocmset = rs_tiocmset,
1653         .get_icount = rs_get_icount,
1654         .proc_fops = &rs_proc_fops,
1655 };
1656
1657 static int amiga_carrier_raised(struct tty_port *port)
1658 {
1659         return !(ciab.pra & SER_DCD);
1660 }
1661
1662 static void amiga_dtr_rts(struct tty_port *port, int raise)
1663 {
1664         struct serial_state *info = container_of(port, struct serial_state,
1665                         tport);
1666         unsigned long flags;
1667
1668         if (raise)
1669                 info->MCR |= SER_DTR|SER_RTS;
1670         else
1671                 info->MCR &= ~(SER_DTR|SER_RTS);
1672
1673         local_irq_save(flags);
1674         rtsdtr_ctrl(info->MCR);
1675         local_irq_restore(flags);
1676 }
1677
1678 static const struct tty_port_operations amiga_port_ops = {
1679         .carrier_raised = amiga_carrier_raised,
1680         .dtr_rts = amiga_dtr_rts,
1681 };
1682
1683 /*
1684  * The serial driver boot-time initialization code!
1685  */
1686 static int __init amiga_serial_probe(struct platform_device *pdev)
1687 {
1688         unsigned long flags;
1689         struct serial_state * state;
1690         int error;
1691
1692         serial_driver = alloc_tty_driver(NR_PORTS);
1693         if (!serial_driver)
1694                 return -ENOMEM;
1695
1696         show_serial_version();
1697
1698         /* Initialize the tty_driver structure */
1699
1700         serial_driver->driver_name = "amiserial";
1701         serial_driver->name = "ttyS";
1702         serial_driver->major = TTY_MAJOR;
1703         serial_driver->minor_start = 64;
1704         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1705         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1706         serial_driver->init_termios = tty_std_termios;
1707         serial_driver->init_termios.c_cflag =
1708                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1709         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1710         tty_set_operations(serial_driver, &serial_ops);
1711
1712         error = tty_register_driver(serial_driver);
1713         if (error)
1714                 goto fail_put_tty_driver;
1715
1716         state = rs_table;
1717         state->port = (int)&custom.serdatr; /* Just to give it a value */
1718         state->custom_divisor = 0;
1719         state->icount.cts = state->icount.dsr =
1720           state->icount.rng = state->icount.dcd = 0;
1721         state->icount.rx = state->icount.tx = 0;
1722         state->icount.frame = state->icount.parity = 0;
1723         state->icount.overrun = state->icount.brk = 0;
1724         tty_port_init(&state->tport);
1725         state->tport.ops = &amiga_port_ops;
1726
1727         printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1728
1729         /* Hardware set up */
1730
1731         state->baud_base = amiga_colorclock;
1732         state->xmit_fifo_size = 1;
1733
1734         /* set ISRs, and then disable the rx interrupts */
1735         error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1736         if (error)
1737                 goto fail_unregister;
1738
1739         error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1740                             "serial RX", state);
1741         if (error)
1742                 goto fail_free_irq;
1743
1744         local_irq_save(flags);
1745
1746         /* turn off Rx and Tx interrupts */
1747         custom.intena = IF_RBF | IF_TBE;
1748         mb();
1749
1750         /* clear any pending interrupt */
1751         custom.intreq = IF_RBF | IF_TBE;
1752         mb();
1753
1754         local_irq_restore(flags);
1755
1756         /*
1757          * set the appropriate directions for the modem control flags,
1758          * and clear RTS and DTR
1759          */
1760         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
1761         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
1762
1763         platform_set_drvdata(pdev, state);
1764
1765         return 0;
1766
1767 fail_free_irq:
1768         free_irq(IRQ_AMIGA_TBE, state);
1769 fail_unregister:
1770         tty_unregister_driver(serial_driver);
1771 fail_put_tty_driver:
1772         put_tty_driver(serial_driver);
1773         return error;
1774 }
1775
1776 static int __exit amiga_serial_remove(struct platform_device *pdev)
1777 {
1778         int error;
1779         struct serial_state *state = platform_get_drvdata(pdev);
1780
1781         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1782         if ((error = tty_unregister_driver(serial_driver)))
1783                 printk("SERIAL: failed to unregister serial driver (%d)\n",
1784                        error);
1785         put_tty_driver(serial_driver);
1786
1787         free_irq(IRQ_AMIGA_TBE, state);
1788         free_irq(IRQ_AMIGA_RBF, state);
1789
1790         platform_set_drvdata(pdev, NULL);
1791
1792         return error;
1793 }
1794
1795 static struct platform_driver amiga_serial_driver = {
1796         .remove = __exit_p(amiga_serial_remove),
1797         .driver   = {
1798                 .name   = "amiga-serial",
1799                 .owner  = THIS_MODULE,
1800         },
1801 };
1802
1803 static int __init amiga_serial_init(void)
1804 {
1805         return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
1806 }
1807
1808 module_init(amiga_serial_init);
1809
1810 static void __exit amiga_serial_exit(void)
1811 {
1812         platform_driver_unregister(&amiga_serial_driver);
1813 }
1814
1815 module_exit(amiga_serial_exit);
1816
1817
1818 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1819
1820 /*
1821  * ------------------------------------------------------------
1822  * Serial console driver
1823  * ------------------------------------------------------------
1824  */
1825
1826 static void amiga_serial_putc(char c)
1827 {
1828         custom.serdat = (unsigned char)c | 0x100;
1829         while (!(custom.serdatr & 0x2000))
1830                 barrier();
1831 }
1832
1833 /*
1834  *      Print a string to the serial port trying not to disturb
1835  *      any possible real use of the port...
1836  *
1837  *      The console must be locked when we get here.
1838  */
1839 static void serial_console_write(struct console *co, const char *s,
1840                                 unsigned count)
1841 {
1842         unsigned short intena = custom.intenar;
1843
1844         custom.intena = IF_TBE;
1845
1846         while (count--) {
1847                 if (*s == '\n')
1848                         amiga_serial_putc('\r');
1849                 amiga_serial_putc(*s++);
1850         }
1851
1852         custom.intena = IF_SETCLR | (intena & IF_TBE);
1853 }
1854
1855 static struct tty_driver *serial_console_device(struct console *c, int *index)
1856 {
1857         *index = 0;
1858         return serial_driver;
1859 }
1860
1861 static struct console sercons = {
1862         .name =         "ttyS",
1863         .write =        serial_console_write,
1864         .device =       serial_console_device,
1865         .flags =        CON_PRINTBUFFER,
1866         .index =        -1,
1867 };
1868
1869 /*
1870  *      Register console.
1871  */
1872 static int __init amiserial_console_init(void)
1873 {
1874         register_console(&sercons);
1875         return 0;
1876 }
1877 console_initcall(amiserial_console_init);
1878
1879 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1880
1881 MODULE_LICENSE("GPL");
1882 MODULE_ALIAS("platform:amiga-serial");