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
  89 #include <asm/irq.h>
  90
  91 #include <asm/amigahw.h>
  92 #include <asm/amigaints.h>
  93
  94 struct serial_state {
  95         struct tty_port         tport;
  96         struct circ_buf         xmit;
  97         struct async_icount     icount;
  98
  99         unsigned long           port;
 100         int                     baud_base;
 101         int                     xmit_fifo_size;
 102         int                     custom_divisor;
 103         int                     read_status_mask;
 104         int                     ignore_status_mask;
 105         int                     timeout;
 106         int                     quot;
 107         int                     IER;    /* Interrupt Enable Register */
 108         int                     MCR;    /* Modem control register */
 109         int                     x_char; /* xon/xoff character */
 110 };
 111
 112 #define custom amiga_custom
 113 static char *serial_name = "Amiga-builtin serial driver";
 114
 115 static struct tty_driver *serial_driver;
 116
 117 /* number of characters left in xmit buffer before we ask for more */
 118 #define WAKEUP_CHARS 256
 119
 120 static unsigned char current_ctl_bits;
 121
 122 static void change_speed(struct tty_struct *tty, struct serial_state *info,
 123                 struct ktermios *old);
 124 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
 125
 126
 127 static struct serial_state rs_table[1];
 128
 129 #define NR_PORTS ARRAY_SIZE(rs_table)
 130
 131 #include <asm/uaccess.h>
 132
 133 #define serial_isroot() (capable(CAP_SYS_ADMIN))
 134
 135
 136 static inline int serial_paranoia_check(struct serial_state *info,
 137                                         char *name, const char *routine)
 138 {
 139 #ifdef SERIAL_PARANOIA_CHECK
 140         static const char *badmagic =
 141                 "Warning: bad magic number for serial struct (%s) in %s\n";
 142         static const char *badinfo =
 143                 "Warning: null async_struct for (%s) in %s\n";
 144
 145         if (!info) {
 146                 printk(badinfo, name, routine);
 147                 return 1;
 148         }
 149         if (info->magic != SERIAL_MAGIC) {
 150                 printk(badmagic, name, routine);
 151                 return 1;
 152         }
 153 #endif
 154         return 0;
 155 }
 156
 157 /* some serial hardware definitions */
 158 #define SDR_OVRUN   (1<<15)
 159 #define SDR_RBF     (1<<14)
 160 #define SDR_TBE     (1<<13)
 161 #define SDR_TSRE    (1<<12)
 162
 163 #define SERPER_PARENB    (1<<15)
 164
 165 #define AC_SETCLR   (1<<15)
 166 #define AC_UARTBRK  (1<<11)
 167
 168 #define SER_DTR     (1<<7)
 169 #define SER_RTS     (1<<6)
 170 #define SER_DCD     (1<<5)
 171 #define SER_CTS     (1<<4)
 172 #define SER_DSR     (1<<3)
 173
 174 static __inline__ void rtsdtr_ctrl(int bits)
 175 {
 176     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
 177 }
 178
 179 /*
 180  * ------------------------------------------------------------
 181  * rs_stop() and rs_start()
 182  *
 183  * This routines are called before setting or resetting tty->stopped.
 184  * They enable or disable transmitter interrupts, as necessary.
 185  * ------------------------------------------------------------
 186  */
 187 static void rs_stop(struct tty_struct *tty)
 188 {
 189         struct serial_state *info = tty->driver_data;
 190         unsigned long flags;
 191
 192         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 193                 return;
 194
 195         local_irq_save(flags);
 196         if (info->IER & UART_IER_THRI) {
 197                 info->IER &= ~UART_IER_THRI;
 198                 /* disable Tx interrupt and remove any pending interrupts */
 199                 custom.intena = IF_TBE;
 200                 mb();
 201                 custom.intreq = IF_TBE;
 202                 mb();
 203         }
 204         local_irq_restore(flags);
 205 }
 206
 207 static void rs_start(struct tty_struct *tty)
 208 {
 209         struct serial_state *info = tty->driver_data;
 210         unsigned long flags;
 211
 212         if (serial_paranoia_check(info, tty->name, "rs_start"))
 213                 return;
 214
 215         local_irq_save(flags);
 216         if (info->xmit.head != info->xmit.tail
 217             && info->xmit.buf
 218             && !(info->IER & UART_IER_THRI)) {
 219                 info->IER |= UART_IER_THRI;
 220                 custom.intena = IF_SETCLR | IF_TBE;
 221                 mb();
 222                 /* set a pending Tx Interrupt, transmitter should restart now */
 223                 custom.intreq = IF_SETCLR | IF_TBE;
 224                 mb();
 225         }
 226         local_irq_restore(flags);
 227 }
 228
 229 /*
 230  * ----------------------------------------------------------------------
 231  *
 232  * Here starts the interrupt handling routines.  All of the following
 233  * subroutines are declared as inline and are folded into
 234  * rs_interrupt().  They were separated out for readability's sake.
 235  *
 236  * Note: rs_interrupt() is a "fast" interrupt, which means that it
 237  * runs with interrupts turned off.  People who may want to modify
 238  * rs_interrupt() should try to keep the interrupt handler as fast as
 239  * possible.  After you are done making modifications, it is not a bad
 240  * idea to do:
 241  *
 242  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 243  *
 244  * and look at the resulting assemble code in serial.s.
 245  *
 246  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
 247  * -----------------------------------------------------------------------
 248  */
 249
 250 static void receive_chars(struct serial_state *info)
 251 {
 252         int status;
 253         int serdatr;
 254         struct tty_struct *tty = info->tport.tty;
 255         unsigned char ch, flag;
 256         struct  async_icount *icount;
 257         int oe = 0;
 258
 259         icount = &info->icount;
 260
 261         status = UART_LSR_DR; /* We obviously have a character! */
 262         serdatr = custom.serdatr;
 263         mb();
 264         custom.intreq = IF_RBF;
 265         mb();
 266
 267         if((serdatr & 0x1ff) == 0)
 268             status |= UART_LSR_BI;
 269         if(serdatr & SDR_OVRUN)
 270             status |= UART_LSR_OE;
 271
 272         ch = serdatr & 0xff;
 273         icount->rx++;
 274
 275 #ifdef SERIAL_DEBUG_INTR
 276         printk("DR%02x:%02x...", ch, status);
 277 #endif
 278         flag = TTY_NORMAL;
 279
 280         /*
 281          * We don't handle parity or frame errors - but I have left
 282          * the code in, since I'm not sure that the errors can't be
 283          * detected.
 284          */
 285
 286         if (status & (UART_LSR_BI | UART_LSR_PE |
 287                       UART_LSR_FE | UART_LSR_OE)) {
 288           /*
 289            * For statistics only
 290            */
 291           if (status & UART_LSR_BI) {
 292             status &= ~(UART_LSR_FE | UART_LSR_PE);
 293             icount->brk++;
 294           } else if (status & UART_LSR_PE)
 295             icount->parity++;
 296           else if (status & UART_LSR_FE)
 297             icount->frame++;
 298           if (status & UART_LSR_OE)
 299             icount->overrun++;
 300
 301           /*
 302            * Now check to see if character should be
 303            * ignored, and mask off conditions which
 304            * should be ignored.
 305            */
 306           if (status & info->ignore_status_mask)
 307             goto out;
 308
 309           status &= info->read_status_mask;
 310
 311           if (status & (UART_LSR_BI)) {
 312 #ifdef SERIAL_DEBUG_INTR
 313             printk("handling break....");
 314 #endif
 315             flag = TTY_BREAK;
 316             if (info->tport.flags & ASYNC_SAK)
 317               do_SAK(tty);
 318           } else if (status & UART_LSR_PE)
 319             flag = TTY_PARITY;
 320           else if (status & UART_LSR_FE)
 321             flag = TTY_FRAME;
 322           if (status & UART_LSR_OE) {
 323             /*
 324              * Overrun is special, since it's
 325              * reported immediately, and doesn't
 326              * affect the current character
 327              */
 328              oe = 1;
 329           }
 330         }
 331         tty_insert_flip_char(tty, ch, flag);
 332         if (oe == 1)
 333                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 334         tty_flip_buffer_push(tty);
 335 out:
 336         return;
 337 }
 338
 339 static void transmit_chars(struct serial_state *info)
 340 {
 341         custom.intreq = IF_TBE;
 342         mb();
 343         if (info->x_char) {
 344                 custom.serdat = info->x_char | 0x100;
 345                 mb();
 346                 info->icount.tx++;
 347                 info->x_char = 0;
 348                 return;
 349         }
 350         if (info->xmit.head == info->xmit.tail
 351             || info->tport.tty->stopped
 352             || info->tport.tty->hw_stopped) {
 353                 info->IER &= ~UART_IER_THRI;
 354                 custom.intena = IF_TBE;
 355                 mb();
 356                 return;
 357         }
 358
 359         custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
 360         mb();
 361         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
 362         info->icount.tx++;
 363
 364         if (CIRC_CNT(info->xmit.head,
 365                      info->xmit.tail,
 366                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
 367                 tty_wakeup(info->tport.tty);
 368
 369 #ifdef SERIAL_DEBUG_INTR
 370         printk("THRE...");
 371 #endif
 372         if (info->xmit.head == info->xmit.tail) {
 373                 custom.intena = IF_TBE;
 374                 mb();
 375                 info->IER &= ~UART_IER_THRI;
 376         }
 377 }
 378
 379 static void check_modem_status(struct serial_state *info)
 380 {
 381         struct tty_port *port = &info->tport;
 382         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 383         unsigned char dstatus;
 384         struct  async_icount *icount;
 385
 386         /* Determine bits that have changed */
 387         dstatus = status ^ current_ctl_bits;
 388         current_ctl_bits = status;
 389
 390         if (dstatus) {
 391                 icount = &info->icount;
 392                 /* update input line counters */
 393                 if (dstatus & SER_DSR)
 394                         icount->dsr++;
 395                 if (dstatus & SER_DCD) {
 396                         icount->dcd++;
 397 #ifdef CONFIG_HARD_PPS
 398                         if ((port->flags & ASYNC_HARDPPS_CD) &&
 399                             !(status & SER_DCD))
 400                                 hardpps();
 401 #endif
 402                 }
 403                 if (dstatus & SER_CTS)
 404                         icount->cts++;
 405                 wake_up_interruptible(&port->delta_msr_wait);
 406         }
 407
 408         if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
 409 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
 410                 printk("ttyS%d CD now %s...", info->line,
 411                        (!(status & SER_DCD)) ? "on" : "off");
 412 #endif
 413                 if (!(status & SER_DCD))
 414                         wake_up_interruptible(&port->open_wait);
 415                 else {
 416 #ifdef SERIAL_DEBUG_OPEN
 417                         printk("doing serial hangup...");
 418 #endif
 419                         if (port->tty)
 420                                 tty_hangup(port->tty);
 421                 }
 422         }
 423         if (port->flags & ASYNC_CTS_FLOW) {
 424                 if (port->tty->hw_stopped) {
 425                         if (!(status & SER_CTS)) {
 426 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 427                                 printk("CTS tx start...");
 428 #endif
 429                                 port->tty->hw_stopped = 0;
 430                                 info->IER |= UART_IER_THRI;
 431                                 custom.intena = IF_SETCLR | IF_TBE;
 432                                 mb();
 433                                 /* set a pending Tx Interrupt, transmitter should restart now */
 434                                 custom.intreq = IF_SETCLR | IF_TBE;
 435                                 mb();
 436                                 tty_wakeup(port->tty);
 437                                 return;
 438                         }
 439                 } else {
 440                         if ((status & SER_CTS)) {
 441 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 442                                 printk("CTS tx stop...");
 443 #endif
 444                                 port->tty->hw_stopped = 1;
 445                                 info->IER &= ~UART_IER_THRI;
 446                                 /* disable Tx interrupt and remove any pending interrupts */
 447                                 custom.intena = IF_TBE;
 448                                 mb();
 449                                 custom.intreq = IF_TBE;
 450                                 mb();
 451                         }
 452                 }
 453         }
 454 }
 455
 456 static irqreturn_t ser_vbl_int( int irq, void *data)
 457 {
 458         /* vbl is just a periodic interrupt we tie into to update modem status */
 459         struct serial_state *info = data;
 460         /*
 461          * TBD - is it better to unregister from this interrupt or to
 462          * ignore it if MSI is clear ?
 463          */
 464         if(info->IER & UART_IER_MSI)
 465           check_modem_status(info);
 466         return IRQ_HANDLED;
 467 }
 468
 469 static irqreturn_t ser_rx_int(int irq, void *dev_id)
 470 {
 471         struct serial_state *info = dev_id;
 472
 473 #ifdef SERIAL_DEBUG_INTR
 474         printk("ser_rx_int...");
 475 #endif
 476
 477         if (!info->tport.tty)
 478                 return IRQ_NONE;
 479
 480         receive_chars(info);
 481 #ifdef SERIAL_DEBUG_INTR
 482         printk("end.\n");
 483 #endif
 484         return IRQ_HANDLED;
 485 }
 486
 487 static irqreturn_t ser_tx_int(int irq, void *dev_id)
 488 {
 489         struct serial_state *info = dev_id;
 490
 491         if (custom.serdatr & SDR_TBE) {
 492 #ifdef SERIAL_DEBUG_INTR
 493           printk("ser_tx_int...");
 494 #endif
 495
 496           if (!info->tport.tty)
 497                 return IRQ_NONE;
 498
 499           transmit_chars(info);
 500 #ifdef SERIAL_DEBUG_INTR
 501           printk("end.\n");
 502 #endif
 503         }
 504         return IRQ_HANDLED;
 505 }
 506
 507 /*
 508  * -------------------------------------------------------------------
 509  * Here ends the serial interrupt routines.
 510  * -------------------------------------------------------------------
 511  */
 512
 513 /*
 514  * ---------------------------------------------------------------
 515  * Low level utility subroutines for the serial driver:  routines to
 516  * figure out the appropriate timeout for an interrupt chain, routines
 517  * to initialize and startup a serial port, and routines to shutdown a
 518  * serial port.  Useful stuff like that.
 519  * ---------------------------------------------------------------
 520  */
 521
 522 static int startup(struct tty_struct *tty, struct serial_state *info)
 523 {
 524         struct tty_port *port = &info->tport;
 525         unsigned long flags;
 526         int     retval=0;
 527         unsigned long page;
 528
 529         page = get_zeroed_page(GFP_KERNEL);
 530         if (!page)
 531                 return -ENOMEM;
 532
 533         local_irq_save(flags);
 534
 535         if (port->flags & ASYNC_INITIALIZED) {
 536                 free_page(page);
 537                 goto errout;
 538         }
 539
 540         if (info->xmit.buf)
 541                 free_page(page);
 542         else
 543                 info->xmit.buf = (unsigned char *) page;
 544
 545 #ifdef SERIAL_DEBUG_OPEN
 546         printk("starting up ttys%d ...", info->line);
 547 #endif
 548
 549         /* Clear anything in the input buffer */
 550
 551         custom.intreq = IF_RBF;
 552         mb();
 553
 554         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
 555         if (retval) {
 556           if (serial_isroot()) {
 557               set_bit(TTY_IO_ERROR, &tty->flags);
 558             retval = 0;
 559           }
 560           goto errout;
 561         }
 562
 563         /* enable both Rx and Tx interrupts */
 564         custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
 565         mb();
 566         info->IER = UART_IER_MSI;
 567
 568         /* remember current state of the DCD and CTS bits */
 569         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 570
 571         info->MCR = 0;
 572         if (C_BAUD(tty))
 573           info->MCR = SER_DTR | SER_RTS;
 574         rtsdtr_ctrl(info->MCR);
 575
 576         clear_bit(TTY_IO_ERROR, &tty->flags);
 577         info->xmit.head = info->xmit.tail = 0;
 578
 579         /*
 580          * Set up the tty->alt_speed kludge
 581          */
 582         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 583                 tty->alt_speed = 57600;
 584         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 585                 tty->alt_speed = 115200;
 586         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 587                 tty->alt_speed = 230400;
 588         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 589                 tty->alt_speed = 460800;
 590
 591         /*
 592          * and set the speed of the serial port
 593          */
 594         change_speed(tty, info, NULL);
 595
 596         port->flags |= ASYNC_INITIALIZED;
 597         local_irq_restore(flags);
 598         return 0;
 599
 600 errout:
 601         local_irq_restore(flags);
 602         return retval;
 603 }
 604
 605 /*
 606  * This routine will shutdown a serial port; interrupts are disabled, and
 607  * DTR is dropped if the hangup on close termio flag is on.
 608  */
 609 static void shutdown(struct tty_struct *tty, struct serial_state *info)
 610 {
 611         unsigned long   flags;
 612         struct serial_state *state;
 613
 614         if (!(info->tport.flags & ASYNC_INITIALIZED))
 615                 return;
 616
 617         state = info;
 618
 619 #ifdef SERIAL_DEBUG_OPEN
 620         printk("Shutting down serial port %d ....\n", info->line);
 621 #endif
 622
 623         local_irq_save(flags); /* Disable interrupts */
 624
 625         /*
 626          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 627          * here so the queue might never be waken up
 628          */
 629         wake_up_interruptible(&info->tport.delta_msr_wait);
 630
 631         /*
 632          * Free the IRQ, if necessary
 633          */
 634         free_irq(IRQ_AMIGA_VERTB, info);
 635
 636         if (info->xmit.buf) {
 637                 free_page((unsigned long) info->xmit.buf);
 638                 info->xmit.buf = NULL;
 639         }
 640
 641         info->IER = 0;
 642         custom.intena = IF_RBF | IF_TBE;
 643         mb();
 644
 645         /* disable break condition */
 646         custom.adkcon = AC_UARTBRK;
 647         mb();
 648
 649         if (tty->termios->c_cflag & HUPCL)
 650                 info->MCR &= ~(SER_DTR|SER_RTS);
 651         rtsdtr_ctrl(info->MCR);
 652
 653         set_bit(TTY_IO_ERROR, &tty->flags);
 654
 655         info->tport.flags &= ~ASYNC_INITIALIZED;
 656         local_irq_restore(flags);
 657 }
 658
 659
 660 /*
 661  * This routine is called to set the UART divisor registers to match
 662  * the specified baud rate for a serial port.
 663  */
 664 static void change_speed(struct tty_struct *tty, struct serial_state *info,
 665                          struct ktermios *old_termios)
 666 {
 667         struct tty_port *port = &info->tport;
 668         int     quot = 0, baud_base, baud;
 669         unsigned cflag, cval = 0;
 670         int     bits;
 671         unsigned long   flags;
 672
 673         cflag = tty->termios->c_cflag;
 674
 675         /* Byte size is always 8 bits plus parity bit if requested */
 676
 677         cval = 3; bits = 10;
 678         if (cflag & CSTOPB) {
 679                 cval |= 0x04;
 680                 bits++;
 681         }
 682         if (cflag & PARENB) {
 683                 cval |= UART_LCR_PARITY;
 684                 bits++;
 685         }
 686         if (!(cflag & PARODD))
 687                 cval |= UART_LCR_EPAR;
 688 #ifdef CMSPAR
 689         if (cflag & CMSPAR)
 690                 cval |= UART_LCR_SPAR;
 691 #endif
 692
 693         /* Determine divisor based on baud rate */
 694         baud = tty_get_baud_rate(tty);
 695         if (!baud)
 696                 baud = 9600;    /* B0 transition handled in rs_set_termios */
 697         baud_base = info->baud_base;
 698         if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 699                 quot = info->custom_divisor;
 700         else {
 701                 if (baud == 134)
 702                         /* Special case since 134 is really 134.5 */
 703                         quot = (2*baud_base / 269);
 704                 else if (baud)
 705                         quot = baud_base / baud;
 706         }
 707         /* If the quotient is zero refuse the change */
 708         if (!quot && old_termios) {
 709                 /* FIXME: Will need updating for new tty in the end */
 710                 tty->termios->c_cflag &= ~CBAUD;
 711                 tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
 712                 baud = tty_get_baud_rate(tty);
 713                 if (!baud)
 714                         baud = 9600;
 715                 if (baud == 38400 &&
 716                     (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 717                         quot = info->custom_divisor;
 718                 else {
 719                         if (baud == 134)
 720                                 /* Special case since 134 is really 134.5 */
 721                                 quot = (2*baud_base / 269);
 722                         else if (baud)
 723                                 quot = baud_base / baud;
 724                 }
 725         }
 726         /* As a last resort, if the quotient is zero, default to 9600 bps */
 727         if (!quot)
 728                 quot = baud_base / 9600;
 729         info->quot = quot;
 730         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
 731         info->timeout += HZ/50;         /* Add .02 seconds of slop */
 732
 733         /* CTS flow control flag and modem status interrupts */
 734         info->IER &= ~UART_IER_MSI;
 735         if (port->flags & ASYNC_HARDPPS_CD)
 736                 info->IER |= UART_IER_MSI;
 737         if (cflag & CRTSCTS) {
 738                 port->flags |= ASYNC_CTS_FLOW;
 739                 info->IER |= UART_IER_MSI;
 740         } else
 741                 port->flags &= ~ASYNC_CTS_FLOW;
 742         if (cflag & CLOCAL)
 743                 port->flags &= ~ASYNC_CHECK_CD;
 744         else {
 745                 port->flags |= ASYNC_CHECK_CD;
 746                 info->IER |= UART_IER_MSI;
 747         }
 748         /* TBD:
 749          * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
 750          */
 751
 752         /*
 753          * Set up parity check flag
 754          */
 755
 756         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
 757         if (I_INPCK(tty))
 758                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 759         if (I_BRKINT(tty) || I_PARMRK(tty))
 760                 info->read_status_mask |= UART_LSR_BI;
 761
 762         /*
 763          * Characters to ignore
 764          */
 765         info->ignore_status_mask = 0;
 766         if (I_IGNPAR(tty))
 767                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 768         if (I_IGNBRK(tty)) {
 769                 info->ignore_status_mask |= UART_LSR_BI;
 770                 /*
 771                  * If we're ignore parity and break indicators, ignore
 772                  * overruns too.  (For real raw support).
 773                  */
 774                 if (I_IGNPAR(tty))
 775                         info->ignore_status_mask |= UART_LSR_OE;
 776         }
 777         /*
 778          * !!! ignore all characters if CREAD is not set
 779          */
 780         if ((cflag & CREAD) == 0)
 781                 info->ignore_status_mask |= UART_LSR_DR;
 782         local_irq_save(flags);
 783
 784         {
 785           short serper;
 786
 787         /* Set up the baud rate */
 788           serper = quot - 1;
 789
 790         /* Enable or disable parity bit */
 791
 792         if(cval & UART_LCR_PARITY)
 793           serper |= (SERPER_PARENB);
 794
 795         custom.serper = serper;
 796         mb();
 797         }
 798
 799         local_irq_restore(flags);
 800 }
 801
 802 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 803 {
 804         struct serial_state *info;
 805         unsigned long flags;
 806
 807         info = tty->driver_data;
 808
 809         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
 810                 return 0;
 811
 812         if (!info->xmit.buf)
 813                 return 0;
 814
 815         local_irq_save(flags);
 816         if (CIRC_SPACE(info->xmit.head,
 817                        info->xmit.tail,
 818                        SERIAL_XMIT_SIZE) == 0) {
 819                 local_irq_restore(flags);
 820                 return 0;
 821         }
 822
 823         info->xmit.buf[info->xmit.head++] = ch;
 824         info->xmit.head &= SERIAL_XMIT_SIZE-1;
 825         local_irq_restore(flags);
 826         return 1;
 827 }
 828
 829 static void rs_flush_chars(struct tty_struct *tty)
 830 {
 831         struct serial_state *info = tty->driver_data;
 832         unsigned long flags;
 833
 834         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 835                 return;
 836
 837         if (info->xmit.head == info->xmit.tail
 838             || tty->stopped
 839             || tty->hw_stopped
 840             || !info->xmit.buf)
 841                 return;
 842
 843         local_irq_save(flags);
 844         info->IER |= UART_IER_THRI;
 845         custom.intena = IF_SETCLR | IF_TBE;
 846         mb();
 847         /* set a pending Tx Interrupt, transmitter should restart now */
 848         custom.intreq = IF_SETCLR | IF_TBE;
 849         mb();
 850         local_irq_restore(flags);
 851 }
 852
 853 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
 854 {
 855         int     c, ret = 0;
 856         struct serial_state *info = tty->driver_data;
 857         unsigned long flags;
 858
 859         if (serial_paranoia_check(info, tty->name, "rs_write"))
 860                 return 0;
 861
 862         if (!info->xmit.buf)
 863                 return 0;
 864
 865         local_irq_save(flags);
 866         while (1) {
 867                 c = CIRC_SPACE_TO_END(info->xmit.head,
 868                                       info->xmit.tail,
 869                                       SERIAL_XMIT_SIZE);
 870                 if (count < c)
 871                         c = count;
 872                 if (c <= 0) {
 873                         break;
 874                 }
 875                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 876                 info->xmit.head = ((info->xmit.head + c) &
 877                                    (SERIAL_XMIT_SIZE-1));
 878                 buf += c;
 879                 count -= c;
 880                 ret += c;
 881         }
 882         local_irq_restore(flags);
 883
 884         if (info->xmit.head != info->xmit.tail
 885             && !tty->stopped
 886             && !tty->hw_stopped
 887             && !(info->IER & UART_IER_THRI)) {
 888                 info->IER |= UART_IER_THRI;
 889                 local_irq_disable();
 890                 custom.intena = IF_SETCLR | IF_TBE;
 891                 mb();
 892                 /* set a pending Tx Interrupt, transmitter should restart now */
 893                 custom.intreq = IF_SETCLR | IF_TBE;
 894                 mb();
 895                 local_irq_restore(flags);
 896         }
 897         return ret;
 898 }
 899
 900 static int rs_write_room(struct tty_struct *tty)
 901 {
 902         struct serial_state *info = tty->driver_data;
 903
 904         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 905                 return 0;
 906         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 907 }
 908
 909 static int rs_chars_in_buffer(struct tty_struct *tty)
 910 {
 911         struct serial_state *info = tty->driver_data;
 912
 913         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 914                 return 0;
 915         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 916 }
 917
 918 static void rs_flush_buffer(struct tty_struct *tty)
 919 {
 920         struct serial_state *info = tty->driver_data;
 921         unsigned long flags;
 922
 923         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 924                 return;
 925         local_irq_save(flags);
 926         info->xmit.head = info->xmit.tail = 0;
 927         local_irq_restore(flags);
 928         tty_wakeup(tty);
 929 }
 930
 931 /*
 932  * This function is used to send a high-priority XON/XOFF character to
 933  * the device
 934  */
 935 static void rs_send_xchar(struct tty_struct *tty, char ch)
 936 {
 937         struct serial_state *info = tty->driver_data;
 938         unsigned long flags;
 939
 940         if (serial_paranoia_check(info, tty->name, "rs_send_char"))
 941                 return;
 942
 943         info->x_char = ch;
 944         if (ch) {
 945                 /* Make sure transmit interrupts are on */
 946
 947                 /* Check this ! */
 948                 local_irq_save(flags);
 949                 if(!(custom.intenar & IF_TBE)) {
 950                     custom.intena = IF_SETCLR | IF_TBE;
 951                     mb();
 952                     /* set a pending Tx Interrupt, transmitter should restart now */
 953                     custom.intreq = IF_SETCLR | IF_TBE;
 954                     mb();
 955                 }
 956                 local_irq_restore(flags);
 957
 958                 info->IER |= UART_IER_THRI;
 959         }
 960 }
 961
 962 /*
 963  * ------------------------------------------------------------
 964  * rs_throttle()
 965  *
 966  * This routine is called by the upper-layer tty layer to signal that
 967  * incoming characters should be throttled.
 968  * ------------------------------------------------------------
 969  */
 970 static void rs_throttle(struct tty_struct * tty)
 971 {
 972         struct serial_state *info = tty->driver_data;
 973         unsigned long flags;
 974 #ifdef SERIAL_DEBUG_THROTTLE
 975         char    buf[64];
 976
 977         printk("throttle %s: %d....\n", tty_name(tty, buf),
 978                tty->ldisc.chars_in_buffer(tty));
 979 #endif
 980
 981         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 982                 return;
 983
 984         if (I_IXOFF(tty))
 985                 rs_send_xchar(tty, STOP_CHAR(tty));
 986
 987         if (tty->termios->c_cflag & CRTSCTS)
 988                 info->MCR &= ~SER_RTS;
 989
 990         local_irq_save(flags);
 991         rtsdtr_ctrl(info->MCR);
 992         local_irq_restore(flags);
 993 }
 994
 995 static void rs_unthrottle(struct tty_struct * tty)
 996 {
 997         struct serial_state *info = tty->driver_data;
 998         unsigned long flags;
 999 #ifdef SERIAL_DEBUG_THROTTLE
1000         char    buf[64];
1001
1002         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1003                tty->ldisc.chars_in_buffer(tty));
1004 #endif
1005
1006         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1007                 return;
1008
1009         if (I_IXOFF(tty)) {
1010                 if (info->x_char)
1011                         info->x_char = 0;
1012                 else
1013                         rs_send_xchar(tty, START_CHAR(tty));
1014         }
1015         if (tty->termios->c_cflag & CRTSCTS)
1016                 info->MCR |= SER_RTS;
1017         local_irq_save(flags);
1018         rtsdtr_ctrl(info->MCR);
1019         local_irq_restore(flags);
1020 }
1021
1022 /*
1023  * ------------------------------------------------------------
1024  * rs_ioctl() and friends
1025  * ------------------------------------------------------------
1026  */
1027
1028 static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
1029                            struct serial_struct __user * retinfo)
1030 {
1031         struct serial_struct tmp;
1032
1033         if (!retinfo)
1034                 return -EFAULT;
1035         memset(&tmp, 0, sizeof(tmp));
1036         tty_lock();
1037         tmp.line = tty->index;
1038         tmp.port = state->port;
1039         tmp.flags = state->tport.flags;
1040         tmp.xmit_fifo_size = state->xmit_fifo_size;
1041         tmp.baud_base = state->baud_base;
1042         tmp.close_delay = state->tport.close_delay;
1043         tmp.closing_wait = state->tport.closing_wait;
1044         tmp.custom_divisor = state->custom_divisor;
1045         tty_unlock();
1046         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1047                 return -EFAULT;
1048         return 0;
1049 }
1050
1051 static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
1052                            struct serial_struct __user * new_info)
1053 {
1054         struct tty_port *port = &state->tport;
1055         struct serial_struct new_serial;
1056         bool change_spd;
1057         int                     retval = 0;
1058
1059         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1060                 return -EFAULT;
1061
1062         tty_lock();
1063         change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
1064                 new_serial.custom_divisor != state->custom_divisor;
1065         if (new_serial.irq || new_serial.port != state->port ||
1066                         new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1067                 tty_unlock();
1068                 return -EINVAL;
1069         }
1070
1071         if (!serial_isroot()) {
1072                 if ((new_serial.baud_base != state->baud_base) ||
1073                     (new_serial.close_delay != port->close_delay) ||
1074                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1075                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1076                      (port->flags & ~ASYNC_USR_MASK))) {
1077                         tty_unlock();
1078                         return -EPERM;
1079                 }
1080                 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1081                                (new_serial.flags & ASYNC_USR_MASK));
1082                 state->custom_divisor = new_serial.custom_divisor;
1083                 goto check_and_exit;
1084         }
1085
1086         if (new_serial.baud_base < 9600) {
1087                 tty_unlock();
1088                 return -EINVAL;
1089         }
1090
1091         /*
1092          * OK, past this point, all the error checking has been done.
1093          * At this point, we start making changes.....
1094          */
1095
1096         state->baud_base = new_serial.baud_base;
1097         port->flags = ((port->flags & ~ASYNC_FLAGS) |
1098                         (new_serial.flags & ASYNC_FLAGS));
1099         state->custom_divisor = new_serial.custom_divisor;
1100         port->close_delay = new_serial.close_delay * HZ/100;
1101         port->closing_wait = new_serial.closing_wait * HZ/100;
1102         tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1103
1104 check_and_exit:
1105         if (port->flags & ASYNC_INITIALIZED) {
1106                 if (change_spd) {
1107                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1108                                 tty->alt_speed = 57600;
1109                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1110                                 tty->alt_speed = 115200;
1111                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1112                                 tty->alt_speed = 230400;
1113                         if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1114                                 tty->alt_speed = 460800;
1115                         change_speed(tty, state, NULL);
1116                 }
1117         } else
1118                 retval = startup(tty, state);
1119         tty_unlock();
1120         return retval;
1121 }
1122
1123
1124 /*
1125  * get_lsr_info - get line status register info
1126  *
1127  * Purpose: Let user call ioctl() to get info when the UART physically
1128  *          is emptied.  On bus types like RS485, the transmitter must
1129  *          release the bus after transmitting. This must be done when
1130  *          the transmit shift register is empty, not be done when the
1131  *          transmit holding register is empty.  This functionality
1132  *          allows an RS485 driver to be written in user space.
1133  */
1134 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1135 {
1136         unsigned char status;
1137         unsigned int result;
1138         unsigned long flags;
1139
1140         local_irq_save(flags);
1141         status = custom.serdatr;
1142         mb();
1143         local_irq_restore(flags);
1144         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1145         if (copy_to_user(value, &result, sizeof(int)))
1146                 return -EFAULT;
1147         return 0;
1148 }
1149
1150
1151 static int rs_tiocmget(struct tty_struct *tty)
1152 {
1153         struct serial_state *info = tty->driver_data;
1154         unsigned char control, status;
1155         unsigned long flags;
1156
1157         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1158                 return -ENODEV;
1159         if (tty->flags & (1 << TTY_IO_ERROR))
1160                 return -EIO;
1161
1162         control = info->MCR;
1163         local_irq_save(flags);
1164         status = ciab.pra;
1165         local_irq_restore(flags);
1166         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1167                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1168                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1169                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1170                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1171 }
1172
1173 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1174                                                 unsigned int clear)
1175 {
1176         struct serial_state *info = tty->driver_data;
1177         unsigned long flags;
1178
1179         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1180                 return -ENODEV;
1181         if (tty->flags & (1 << TTY_IO_ERROR))
1182                 return -EIO;
1183
1184         local_irq_save(flags);
1185         if (set & TIOCM_RTS)
1186                 info->MCR |= SER_RTS;
1187         if (set & TIOCM_DTR)
1188                 info->MCR |= SER_DTR;
1189         if (clear & TIOCM_RTS)
1190                 info->MCR &= ~SER_RTS;
1191         if (clear & TIOCM_DTR)
1192                 info->MCR &= ~SER_DTR;
1193         rtsdtr_ctrl(info->MCR);
1194         local_irq_restore(flags);
1195         return 0;
1196 }
1197
1198 /*
1199  * rs_break() --- routine which turns the break handling on or off
1200  */
1201 static int rs_break(struct tty_struct *tty, int break_state)
1202 {
1203         struct serial_state *info = tty->driver_data;
1204         unsigned long flags;
1205
1206         if (serial_paranoia_check(info, tty->name, "rs_break"))
1207                 return -EINVAL;
1208
1209         local_irq_save(flags);
1210         if (break_state == -1)
1211           custom.adkcon = AC_SETCLR | AC_UARTBRK;
1212         else
1213           custom.adkcon = AC_UARTBRK;
1214         mb();
1215         local_irq_restore(flags);
1216         return 0;
1217 }
1218
1219 /*
1220  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1221  * Return: write counters to the user passed counter struct
1222  * NB: both 1->0 and 0->1 transitions are counted except for
1223  *     RI where only 0->1 is counted.
1224  */
1225 static int rs_get_icount(struct tty_struct *tty,
1226                                 struct serial_icounter_struct *icount)
1227 {
1228         struct serial_state *info = tty->driver_data;
1229         struct async_icount cnow;
1230         unsigned long flags;
1231
1232         local_irq_save(flags);
1233         cnow = info->icount;
1234         local_irq_restore(flags);
1235         icount->cts = cnow.cts;
1236         icount->dsr = cnow.dsr;
1237         icount->rng = cnow.rng;
1238         icount->dcd = cnow.dcd;
1239         icount->rx = cnow.rx;
1240         icount->tx = cnow.tx;
1241         icount->frame = cnow.frame;
1242         icount->overrun = cnow.overrun;
1243         icount->parity = cnow.parity;
1244         icount->brk = cnow.brk;
1245         icount->buf_overrun = cnow.buf_overrun;
1246
1247         return 0;
1248 }
1249
1250 static int rs_ioctl(struct tty_struct *tty,
1251                     unsigned int cmd, unsigned long arg)
1252 {
1253         struct serial_state *info = tty->driver_data;
1254         struct async_icount cprev, cnow;        /* kernel counter temps */
1255         void __user *argp = (void __user *)arg;
1256         unsigned long flags;
1257
1258         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1259                 return -ENODEV;
1260
1261         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1262             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1263             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1264                 if (tty->flags & (1 << TTY_IO_ERROR))
1265                     return -EIO;
1266         }
1267
1268         switch (cmd) {
1269                 case TIOCGSERIAL:
1270                         return get_serial_info(tty, info, argp);
1271                 case TIOCSSERIAL:
1272                         return set_serial_info(tty, info, argp);
1273                 case TIOCSERCONFIG:
1274                         return 0;
1275
1276                 case TIOCSERGETLSR: /* Get line status register */
1277                         return get_lsr_info(info, argp);
1278
1279                 case TIOCSERGSTRUCT:
1280                         if (copy_to_user(argp,
1281                                          info, sizeof(struct serial_state)))
1282                                 return -EFAULT;
1283                         return 0;
1284
1285                 /*
1286                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1287                  * - mask passed in arg for lines of interest
1288                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1289                  * Caller should use TIOCGICOUNT to see which one it was
1290                  */
1291                 case TIOCMIWAIT:
1292                         local_irq_save(flags);
1293                         /* note the counters on entry */
1294                         cprev = info->icount;
1295                         local_irq_restore(flags);
1296                         while (1) {
1297                                 interruptible_sleep_on(&info->tport.delta_msr_wait);
1298                                 /* see if a signal did it */
1299                                 if (signal_pending(current))
1300                                         return -ERESTARTSYS;
1301                                 local_irq_save(flags);
1302                                 cnow = info->icount; /* atomic copy */
1303                                 local_irq_restore(flags);
1304                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1305                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1306                                         return -EIO; /* no change => error */
1307                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1308                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1309                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1310                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1311                                         return 0;
1312                                 }
1313                                 cprev = cnow;
1314                         }
1315                         /* NOTREACHED */
1316
1317                 case TIOCSERGWILD:
1318                 case TIOCSERSWILD:
1319                         /* "setserial -W" is called in Debian boot */
1320                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1321                         return 0;
1322
1323                 default:
1324                         return -ENOIOCTLCMD;
1325                 }
1326         return 0;
1327 }
1328
1329 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1330 {
1331         struct serial_state *info = tty->driver_data;
1332         unsigned long flags;
1333         unsigned int cflag = tty->termios->c_cflag;
1334
1335         change_speed(tty, info, old_termios);
1336
1337         /* Handle transition to B0 status */
1338         if ((old_termios->c_cflag & CBAUD) &&
1339             !(cflag & CBAUD)) {
1340                 info->MCR &= ~(SER_DTR|SER_RTS);
1341                 local_irq_save(flags);
1342                 rtsdtr_ctrl(info->MCR);
1343                 local_irq_restore(flags);
1344         }
1345
1346         /* Handle transition away from B0 status */
1347         if (!(old_termios->c_cflag & CBAUD) &&
1348             (cflag & CBAUD)) {
1349                 info->MCR |= SER_DTR;
1350                 if (!(tty->termios->c_cflag & CRTSCTS) ||
1351                     !test_bit(TTY_THROTTLED, &tty->flags)) {
1352                         info->MCR |= SER_RTS;
1353                 }
1354                 local_irq_save(flags);
1355                 rtsdtr_ctrl(info->MCR);
1356                 local_irq_restore(flags);
1357         }
1358
1359         /* Handle turning off CRTSCTS */
1360         if ((old_termios->c_cflag & CRTSCTS) &&
1361             !(tty->termios->c_cflag & CRTSCTS)) {
1362                 tty->hw_stopped = 0;
1363                 rs_start(tty);
1364         }
1365
1366 #if 0
1367         /*
1368          * No need to wake up processes in open wait, since they
1369          * sample the CLOCAL flag once, and don't recheck it.
1370          * XXX  It's not clear whether the current behavior is correct
1371          * or not.  Hence, this may change.....
1372          */
1373         if (!(old_termios->c_cflag & CLOCAL) &&
1374             (tty->termios->c_cflag & CLOCAL))
1375                 wake_up_interruptible(&info->open_wait);
1376 #endif
1377 }
1378
1379 /*
1380  * ------------------------------------------------------------
1381  * rs_close()
1382  *
1383  * This routine is called when the serial port gets closed.  First, we
1384  * wait for the last remaining data to be sent.  Then, we unlink its
1385  * async structure from the interrupt chain if necessary, and we free
1386  * that IRQ if nothing is left in the chain.
1387  * ------------------------------------------------------------
1388  */
1389 static void rs_close(struct tty_struct *tty, struct file * filp)
1390 {
1391         struct serial_state *state = tty->driver_data;
1392         struct tty_port *port = &state->tport;
1393
1394         if (serial_paranoia_check(state, tty->name, "rs_close"))
1395                 return;
1396
1397         if (tty_port_close_start(port, tty, filp) == 0)
1398                 return;
1399
1400         /*
1401          * At this point we stop accepting input.  To do this, we
1402          * disable the receive line status interrupts, and tell the
1403          * interrupt driver to stop checking the data ready bit in the
1404          * line status register.
1405          */
1406         state->read_status_mask &= ~UART_LSR_DR;
1407         if (port->flags & ASYNC_INITIALIZED) {
1408                 /* disable receive interrupts */
1409                 custom.intena = IF_RBF;
1410                 mb();
1411                 /* clear any pending receive interrupt */
1412                 custom.intreq = IF_RBF;
1413                 mb();
1414
1415                 /*
1416                  * Before we drop DTR, make sure the UART transmitter
1417                  * has completely drained; this is especially
1418                  * important if there is a transmit FIFO!
1419                  */
1420                 rs_wait_until_sent(tty, state->timeout);
1421         }
1422         shutdown(tty, state);
1423         rs_flush_buffer(tty);
1424
1425         tty_ldisc_flush(tty);
1426         port->tty = NULL;
1427
1428         tty_port_close_end(port, tty);
1429 }
1430
1431 /*
1432  * rs_wait_until_sent() --- wait until the transmitter is empty
1433  */
1434 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1435 {
1436         struct serial_state *info = tty->driver_data;
1437         unsigned long orig_jiffies, char_time;
1438         int lsr;
1439
1440         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1441                 return;
1442
1443         if (info->xmit_fifo_size == 0)
1444                 return; /* Just in case.... */
1445
1446         orig_jiffies = jiffies;
1447
1448         /*
1449          * Set the check interval to be 1/5 of the estimated time to
1450          * send a single character, and make it at least 1.  The check
1451          * interval should also be less than the timeout.
1452          *
1453          * Note: we have to use pretty tight timings here to satisfy
1454          * the NIST-PCTS.
1455          */
1456         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1457         char_time = char_time / 5;
1458         if (char_time == 0)
1459                 char_time = 1;
1460         if (timeout)
1461           char_time = min_t(unsigned long, char_time, timeout);
1462         /*
1463          * If the transmitter hasn't cleared in twice the approximate
1464          * amount of time to send the entire FIFO, it probably won't
1465          * ever clear.  This assumes the UART isn't doing flow
1466          * control, which is currently the case.  Hence, if it ever
1467          * takes longer than info->timeout, this is probably due to a
1468          * UART bug of some kind.  So, we clamp the timeout parameter at
1469          * 2*info->timeout.
1470          */
1471         if (!timeout || timeout > 2*info->timeout)
1472                 timeout = 2*info->timeout;
1473 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1474         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1475         printk("jiff=%lu...", jiffies);
1476 #endif
1477         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1478 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1479                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1480 #endif
1481                 msleep_interruptible(jiffies_to_msecs(char_time));
1482                 if (signal_pending(current))
1483                         break;
1484                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1485                         break;
1486         }
1487         __set_current_state(TASK_RUNNING);
1488
1489 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1490         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1491 #endif
1492 }
1493
1494 /*
1495  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1496  */
1497 static void rs_hangup(struct tty_struct *tty)
1498 {
1499         struct serial_state *info = tty->driver_data;
1500
1501         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1502                 return;
1503
1504         rs_flush_buffer(tty);
1505         shutdown(tty, info);
1506         info->tport.count = 0;
1507         info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
1508         info->tport.tty = NULL;
1509         wake_up_interruptible(&info->tport.open_wait);
1510 }
1511
1512 /*
1513  * This routine is called whenever a serial port is opened.  It
1514  * enables interrupts for a serial port, linking in its async structure into
1515  * the IRQ chain.   It also performs the serial-specific
1516  * initialization for the tty structure.
1517  */
1518 static int rs_open(struct tty_struct *tty, struct file * filp)
1519 {
1520         struct serial_state *info = rs_table + tty->index;
1521         struct tty_port *port = &info->tport;
1522         int retval;
1523
1524         port->count++;
1525         port->tty = tty;
1526         tty->driver_data = info;
1527         tty->port = port;
1528         if (serial_paranoia_check(info, tty->name, "rs_open"))
1529                 return -ENODEV;
1530
1531         tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1532
1533         retval = startup(tty, info);
1534         if (retval) {
1535                 return retval;
1536         }
1537
1538         return tty_port_block_til_ready(port, tty, filp);
1539 }
1540
1541 /*
1542  * /proc fs routines....
1543  */
1544
1545 static inline void line_info(struct seq_file *m, int line,
1546                 struct serial_state *state)
1547 {
1548         char    stat_buf[30], control, status;
1549         unsigned long flags;
1550
1551         seq_printf(m, "%d: uart:amiga_builtin", line);
1552
1553         local_irq_save(flags);
1554         status = ciab.pra;
1555         control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status;
1556         local_irq_restore(flags);
1557
1558         stat_buf[0] = 0;
1559         stat_buf[1] = 0;
1560         if(!(control & SER_RTS))
1561                 strcat(stat_buf, "|RTS");
1562         if(!(status & SER_CTS))
1563                 strcat(stat_buf, "|CTS");
1564         if(!(control & SER_DTR))
1565                 strcat(stat_buf, "|DTR");
1566         if(!(status & SER_DSR))
1567                 strcat(stat_buf, "|DSR");
1568         if(!(status & SER_DCD))
1569                 strcat(stat_buf, "|CD");
1570
1571         if (state->quot)
1572                 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1573
1574         seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1575
1576         if (state->icount.frame)
1577                 seq_printf(m, " fe:%d", state->icount.frame);
1578
1579         if (state->icount.parity)
1580                 seq_printf(m, " pe:%d", state->icount.parity);
1581
1582         if (state->icount.brk)
1583                 seq_printf(m, " brk:%d", state->icount.brk);
1584
1585         if (state->icount.overrun)
1586                 seq_printf(m, " oe:%d", state->icount.overrun);
1587
1588         /*
1589          * Last thing is the RS-232 status lines
1590          */
1591         seq_printf(m, " %s\n", stat_buf+1);
1592 }
1593
1594 static int rs_proc_show(struct seq_file *m, void *v)
1595 {
1596         seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1597         line_info(m, 0, &rs_table[0]);
1598         return 0;
1599 }
1600
1601 static int rs_proc_open(struct inode *inode, struct file *file)
1602 {
1603         return single_open(file, rs_proc_show, NULL);
1604 }
1605
1606 static const struct file_operations rs_proc_fops = {
1607         .owner          = THIS_MODULE,
1608         .open           = rs_proc_open,
1609         .read           = seq_read,
1610         .llseek         = seq_lseek,
1611         .release        = single_release,
1612 };
1613
1614 /*
1615  * ---------------------------------------------------------------------
1616  * rs_init() and friends
1617  *
1618  * rs_init() is called at boot-time to initialize the serial driver.
1619  * ---------------------------------------------------------------------
1620  */
1621
1622 /*
1623  * This routine prints out the appropriate serial driver version
1624  * number, and identifies which options were configured into this
1625  * driver.
1626  */
1627 static void show_serial_version(void)
1628 {
1629         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1630 }
1631
1632
1633 static const struct tty_operations serial_ops = {
1634         .open = rs_open,
1635         .close = rs_close,
1636         .write = rs_write,
1637         .put_char = rs_put_char,
1638         .flush_chars = rs_flush_chars,
1639         .write_room = rs_write_room,
1640         .chars_in_buffer = rs_chars_in_buffer,
1641         .flush_buffer = rs_flush_buffer,
1642         .ioctl = rs_ioctl,
1643         .throttle = rs_throttle,
1644         .unthrottle = rs_unthrottle,
1645         .set_termios = rs_set_termios,
1646         .stop = rs_stop,
1647         .start = rs_start,
1648         .hangup = rs_hangup,
1649         .break_ctl = rs_break,
1650         .send_xchar = rs_send_xchar,
1651         .wait_until_sent = rs_wait_until_sent,
1652         .tiocmget = rs_tiocmget,
1653         .tiocmset = rs_tiocmset,
1654         .get_icount = rs_get_icount,
1655         .proc_fops = &rs_proc_fops,
1656 };
1657
1658 static int amiga_carrier_raised(struct tty_port *port)
1659 {
1660         return !(ciab.pra & SER_DCD);
1661 }
1662
1663 static void amiga_dtr_rts(struct tty_port *port, int raise)
1664 {
1665         struct serial_state *info = container_of(port, struct serial_state,
1666                         tport);
1667         unsigned long flags;
1668
1669         if (raise)
1670                 info->MCR |= SER_DTR|SER_RTS;
1671         else
1672                 info->MCR &= ~(SER_DTR|SER_RTS);
1673
1674         local_irq_save(flags);
1675         rtsdtr_ctrl(info->MCR);
1676         local_irq_restore(flags);
1677 }
1678
1679 static const struct tty_port_operations amiga_port_ops = {
1680         .carrier_raised = amiga_carrier_raised,
1681         .dtr_rts = amiga_dtr_rts,
1682 };
1683
1684 /*
1685  * The serial driver boot-time initialization code!
1686  */
1687 static int __init amiga_serial_probe(struct platform_device *pdev)
1688 {
1689         unsigned long flags;
1690         struct serial_state * state;
1691         int error;
1692
1693         serial_driver = alloc_tty_driver(NR_PORTS);
1694         if (!serial_driver)
1695                 return -ENOMEM;
1696
1697         show_serial_version();
1698
1699         /* Initialize the tty_driver structure */
1700
1701         serial_driver->driver_name = "amiserial";
1702         serial_driver->name = "ttyS";
1703         serial_driver->major = TTY_MAJOR;
1704         serial_driver->minor_start = 64;
1705         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1706         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1707         serial_driver->init_termios = tty_std_termios;
1708         serial_driver->init_termios.c_cflag =
1709                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1710         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1711         tty_set_operations(serial_driver, &serial_ops);
1712
1713         error = tty_register_driver(serial_driver);
1714         if (error)
1715                 goto fail_put_tty_driver;
1716
1717         state = rs_table;
1718         state->port = (int)&custom.serdatr; /* Just to give it a value */
1719         state->custom_divisor = 0;
1720         state->icount.cts = state->icount.dsr =
1721           state->icount.rng = state->icount.dcd = 0;
1722         state->icount.rx = state->icount.tx = 0;
1723         state->icount.frame = state->icount.parity = 0;
1724         state->icount.overrun = state->icount.brk = 0;
1725         tty_port_init(&state->tport);
1726         state->tport.ops = &amiga_port_ops;
1727
1728         printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1729
1730         /* Hardware set up */
1731
1732         state->baud_base = amiga_colorclock;
1733         state->xmit_fifo_size = 1;
1734
1735         /* set ISRs, and then disable the rx interrupts */
1736         error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1737         if (error)
1738                 goto fail_unregister;
1739
1740         error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1741                             "serial RX", state);
1742         if (error)
1743                 goto fail_free_irq;
1744
1745         local_irq_save(flags);
1746
1747         /* turn off Rx and Tx interrupts */
1748         custom.intena = IF_RBF | IF_TBE;
1749         mb();
1750
1751         /* clear any pending interrupt */
1752         custom.intreq = IF_RBF | IF_TBE;
1753         mb();
1754
1755         local_irq_restore(flags);
1756
1757         /*
1758          * set the appropriate directions for the modem control flags,
1759          * and clear RTS and DTR
1760          */
1761         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
1762         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
1763
1764         platform_set_drvdata(pdev, state);
1765
1766         return 0;
1767
1768 fail_free_irq:
1769         free_irq(IRQ_AMIGA_TBE, state);
1770 fail_unregister:
1771         tty_unregister_driver(serial_driver);
1772 fail_put_tty_driver:
1773         put_tty_driver(serial_driver);
1774         return error;
1775 }
1776
1777 static int __exit amiga_serial_remove(struct platform_device *pdev)
1778 {
1779         int error;
1780         struct serial_state *state = platform_get_drvdata(pdev);
1781
1782         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1783         if ((error = tty_unregister_driver(serial_driver)))
1784                 printk("SERIAL: failed to unregister serial driver (%d)\n",
1785                        error);
1786         put_tty_driver(serial_driver);
1787
1788         free_irq(IRQ_AMIGA_TBE, state);
1789         free_irq(IRQ_AMIGA_RBF, state);
1790
1791         platform_set_drvdata(pdev, NULL);
1792
1793         return error;
1794 }
1795
1796 static struct platform_driver amiga_serial_driver = {
1797         .remove = __exit_p(amiga_serial_remove),
1798         .driver   = {
1799                 .name   = "amiga-serial",
1800                 .owner  = THIS_MODULE,
1801         },
1802 };
1803
1804 static int __init amiga_serial_init(void)
1805 {
1806         return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
1807 }
1808
1809 module_init(amiga_serial_init);
1810
1811 static void __exit amiga_serial_exit(void)
1812 {
1813         platform_driver_unregister(&amiga_serial_driver);
1814 }
1815
1816 module_exit(amiga_serial_exit);
1817
1818
1819 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1820
1821 /*
1822  * ------------------------------------------------------------
1823  * Serial console driver
1824  * ------------------------------------------------------------
1825  */
1826
1827 static void amiga_serial_putc(char c)
1828 {
1829         custom.serdat = (unsigned char)c | 0x100;
1830         while (!(custom.serdatr & 0x2000))
1831                 barrier();
1832 }
1833
1834 /*
1835  *      Print a string to the serial port trying not to disturb
1836  *      any possible real use of the port...
1837  *
1838  *      The console must be locked when we get here.
1839  */
1840 static void serial_console_write(struct console *co, const char *s,
1841                                 unsigned count)
1842 {
1843         unsigned short intena = custom.intenar;
1844
1845         custom.intena = IF_TBE;
1846
1847         while (count--) {
1848                 if (*s == '\n')
1849                         amiga_serial_putc('\r');
1850                 amiga_serial_putc(*s++);
1851         }
1852
1853         custom.intena = IF_SETCLR | (intena & IF_TBE);
1854 }
1855
1856 static struct tty_driver *serial_console_device(struct console *c, int *index)
1857 {
1858         *index = 0;
1859         return serial_driver;
1860 }
1861
1862 static struct console sercons = {
1863         .name =         "ttyS",
1864         .write =        serial_console_write,
1865         .device =       serial_console_device,
1866         .flags =        CON_PRINTBUFFER,
1867         .index =        -1,
1868 };
1869
1870 /*
1871  *      Register console.
1872  */
1873 static int __init amiserial_console_init(void)
1874 {
1875         register_console(&sercons);
1876         return 0;
1877 }
1878 console_initcall(amiserial_console_init);
1879
1880 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1881
1882 MODULE_LICENSE("GPL");
1883 MODULE_ALIAS("platform:amiga-serial");