drivers/tty/amiserial.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Serial driver for the amiga builtin port.
   4  *
   5  * This code was created by taking serial.c version 4.30 from kernel
   6  * release 2.3.22, replacing all hardware related stuff with the
   7  * corresponding amiga hardware actions, and removing all irrelevant
   8  * code. As a consequence, it uses many of the constants and names
   9  * associated with the registers and bits of 16550 compatible UARTS -
  10  * but only to keep track of status, etc in the state variables. It
  11  * was done this was to make it easier to keep the code in line with
  12  * (non hardware specific) changes to serial.c.
  13  *
  14  * The port is registered with the tty driver as minor device 64, and
  15  * therefore other ports should only use 65 upwards.
  16  *
  17  * Richard Lucock 28/12/99
  18  *
  19  *  Copyright (C) 1991, 1992  Linus Torvalds
  20  *  Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
  21  *              1998, 1999  Theodore Ts'o
  22  *
  23  */
  24
  25 /* Set of debugging defines */
  26
  27 #undef SERIAL_DEBUG_INTR
  28 #undef SERIAL_DEBUG_OPEN
  29 #undef SERIAL_DEBUG_FLOW
  30 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
  31
  32 /*
  33  * End of serial driver configuration section.
  34  */
  35
  36 #include <linux/bitops.h>
  37 #include <linux/circ_buf.h>
  38 #include <linux/console.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/fcntl.h>
  42 #include <linux/init.h>
  43 #include <linux/interrupt.h>
  44 #include <linux/ioport.h>
  45 #include <linux/kernel.h>
  46 #include <linux/major.h>
  47 #include <linux/mm.h>
  48 #include <linux/module.h>
  49 #include <linux/platform_device.h>
  50 #include <linux/ptrace.h>
  51 #include <linux/seq_file.h>
  52 #include <linux/serial.h>
  53 #include <linux/serial_reg.h>
  54 #include <linux/serial_core.h>
  55 #include <linux/sched.h>
  56 #include <linux/signal.h>
  57 #include <linux/slab.h>
  58 #include <linux/string.h>
  59 #include <linux/timer.h>
  60 #include <linux/tty_flip.h>
  61 #include <linux/tty.h>
  62 #include <linux/types.h>
  63 #include <linux/uaccess.h>
  64
  65 #include <asm/amigahw.h>
  66 #include <asm/amigaints.h>
  67 #include <asm/irq.h>
  68 #include <asm/setup.h>
  69
  70 struct serial_state {
  71         struct tty_port         tport;
  72         struct circ_buf         xmit;
  73         struct async_icount     icount;
  74
  75         unsigned long           port;
  76         int                     baud_base;
  77         int                     custom_divisor;
  78         int                     read_status_mask;
  79         int                     ignore_status_mask;
  80         int                     timeout;
  81         int                     quot;
  82         int                     IER;    /* Interrupt Enable Register */
  83         int                     MCR;    /* Modem control register */
  84         u8                      x_char; /* xon/xoff character */
  85 };
  86
  87 static struct tty_driver *serial_driver;
  88
  89 /* number of characters left in xmit buffer before we ask for more */
  90 #define WAKEUP_CHARS 256
  91
  92 #define XMIT_FIFO_SIZE 1
  93
  94 static unsigned char current_ctl_bits;
  95
  96 static void change_speed(struct tty_struct *tty, struct serial_state *info,
  97                          const struct ktermios *old);
  98 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
  99
 100
 101 static struct serial_state serial_state;
 102
 103 /* some serial hardware definitions */
 104 #define SDR_OVRUN   (1<<15)
 105 #define SDR_RBF     (1<<14)
 106 #define SDR_TBE     (1<<13)
 107 #define SDR_TSRE    (1<<12)
 108
 109 #define SERPER_PARENB    (1<<15)
 110
 111 #define AC_SETCLR   (1<<15)
 112 #define AC_UARTBRK  (1<<11)
 113
 114 #define SER_DTR     (1<<7)
 115 #define SER_RTS     (1<<6)
 116 #define SER_DCD     (1<<5)
 117 #define SER_CTS     (1<<4)
 118 #define SER_DSR     (1<<3)
 119
 120 static __inline__ void rtsdtr_ctrl(int bits)
 121 {
 122     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
 123 }
 124
 125 /*
 126  * ------------------------------------------------------------
 127  * rs_stop() and rs_start()
 128  *
 129  * This routines are called before setting or resetting tty->flow.stopped.
 130  * They enable or disable transmitter interrupts, as necessary.
 131  * ------------------------------------------------------------
 132  */
 133 static void rs_stop(struct tty_struct *tty)
 134 {
 135         struct serial_state *info = tty->driver_data;
 136         unsigned long flags;
 137
 138         local_irq_save(flags);
 139         if (info->IER & UART_IER_THRI) {
 140                 info->IER &= ~UART_IER_THRI;
 141                 /* disable Tx interrupt and remove any pending interrupts */
 142                 amiga_custom.intena = IF_TBE;
 143                 mb();
 144                 amiga_custom.intreq = IF_TBE;
 145                 mb();
 146         }
 147         local_irq_restore(flags);
 148 }
 149
 150 static void rs_start(struct tty_struct *tty)
 151 {
 152         struct serial_state *info = tty->driver_data;
 153         unsigned long flags;
 154
 155         local_irq_save(flags);
 156         if (info->xmit.head != info->xmit.tail
 157             && info->xmit.buf
 158             && !(info->IER & UART_IER_THRI)) {
 159                 info->IER |= UART_IER_THRI;
 160                 amiga_custom.intena = IF_SETCLR | IF_TBE;
 161                 mb();
 162                 /* set a pending Tx Interrupt, transmitter should restart now */
 163                 amiga_custom.intreq = IF_SETCLR | IF_TBE;
 164                 mb();
 165         }
 166         local_irq_restore(flags);
 167 }
 168
 169 /*
 170  * ----------------------------------------------------------------------
 171  *
 172  * Here start the interrupt handling routines.
 173  *
 174  * -----------------------------------------------------------------------
 175  */
 176
 177 static void receive_chars(struct serial_state *info)
 178 {
 179         int status;
 180         int serdatr;
 181         u8 ch, flag;
 182         struct  async_icount *icount;
 183         bool overrun = false;
 184
 185         icount = &info->icount;
 186
 187         status = UART_LSR_DR; /* We obviously have a character! */
 188         serdatr = amiga_custom.serdatr;
 189         mb();
 190         amiga_custom.intreq = IF_RBF;
 191         mb();
 192
 193         if((serdatr & 0x1ff) == 0)
 194             status |= UART_LSR_BI;
 195         if(serdatr & SDR_OVRUN)
 196             status |= UART_LSR_OE;
 197
 198         ch = serdatr & 0xff;
 199         icount->rx++;
 200
 201 #ifdef SERIAL_DEBUG_INTR
 202         printk("DR%02x:%02x...", ch, status);
 203 #endif
 204         flag = TTY_NORMAL;
 205
 206         /*
 207          * We don't handle parity or frame errors - but I have left
 208          * the code in, since I'm not sure that the errors can't be
 209          * detected.
 210          */
 211
 212         if (status & (UART_LSR_BI | UART_LSR_PE |
 213                       UART_LSR_FE | UART_LSR_OE)) {
 214           /*
 215            * For statistics only
 216            */
 217           if (status & UART_LSR_BI) {
 218             status &= ~(UART_LSR_FE | UART_LSR_PE);
 219             icount->brk++;
 220           } else if (status & UART_LSR_PE)
 221             icount->parity++;
 222           else if (status & UART_LSR_FE)
 223             icount->frame++;
 224           if (status & UART_LSR_OE)
 225             icount->overrun++;
 226
 227           /*
 228            * Now check to see if character should be
 229            * ignored, and mask off conditions which
 230            * should be ignored.
 231            */
 232           if (status & info->ignore_status_mask)
 233                   return;
 234
 235           status &= info->read_status_mask;
 236
 237           if (status & (UART_LSR_BI)) {
 238 #ifdef SERIAL_DEBUG_INTR
 239             printk("handling break....");
 240 #endif
 241             flag = TTY_BREAK;
 242             if (info->tport.flags & ASYNC_SAK)
 243               do_SAK(info->tport.tty);
 244           } else if (status & UART_LSR_PE)
 245             flag = TTY_PARITY;
 246           else if (status & UART_LSR_FE)
 247             flag = TTY_FRAME;
 248           if (status & UART_LSR_OE) {
 249             /*
 250              * Overrun is special, since it's
 251              * reported immediately, and doesn't
 252              * affect the current character
 253              */
 254              overrun = true;
 255           }
 256         }
 257         tty_insert_flip_char(&info->tport, ch, flag);
 258         if (overrun)
 259                 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
 260         tty_flip_buffer_push(&info->tport);
 261 }
 262
 263 static void transmit_chars(struct serial_state *info)
 264 {
 265         amiga_custom.intreq = IF_TBE;
 266         mb();
 267         if (info->x_char) {
 268                 amiga_custom.serdat = info->x_char | 0x100;
 269                 mb();
 270                 info->icount.tx++;
 271                 info->x_char = 0;
 272                 return;
 273         }
 274         if (info->xmit.head == info->xmit.tail
 275             || info->tport.tty->flow.stopped
 276             || info->tport.tty->hw_stopped) {
 277                 info->IER &= ~UART_IER_THRI;
 278                 amiga_custom.intena = IF_TBE;
 279                 mb();
 280                 return;
 281         }
 282
 283         amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
 284         mb();
 285         info->xmit.tail = info->xmit.tail & (UART_XMIT_SIZE - 1);
 286         info->icount.tx++;
 287
 288         if (CIRC_CNT(info->xmit.head,
 289                      info->xmit.tail,
 290                      UART_XMIT_SIZE) < WAKEUP_CHARS)
 291                 tty_wakeup(info->tport.tty);
 292
 293 #ifdef SERIAL_DEBUG_INTR
 294         printk("THRE...");
 295 #endif
 296         if (info->xmit.head == info->xmit.tail) {
 297                 amiga_custom.intena = IF_TBE;
 298                 mb();
 299                 info->IER &= ~UART_IER_THRI;
 300         }
 301 }
 302
 303 static void check_modem_status(struct serial_state *info)
 304 {
 305         struct tty_port *port = &info->tport;
 306         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 307         unsigned char dstatus;
 308         struct  async_icount *icount;
 309
 310         /* Determine bits that have changed */
 311         dstatus = status ^ current_ctl_bits;
 312         current_ctl_bits = status;
 313
 314         if (dstatus) {
 315                 icount = &info->icount;
 316                 /* update input line counters */
 317                 if (dstatus & SER_DSR)
 318                         icount->dsr++;
 319                 if (dstatus & SER_DCD) {
 320                         icount->dcd++;
 321                 }
 322                 if (dstatus & SER_CTS)
 323                         icount->cts++;
 324                 wake_up_interruptible(&port->delta_msr_wait);
 325         }
 326
 327         if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
 328 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
 329                 printk("ttyS%d CD now %s...", info->line,
 330                        (!(status & SER_DCD)) ? "on" : "off");
 331 #endif
 332                 if (!(status & SER_DCD))
 333                         wake_up_interruptible(&port->open_wait);
 334                 else {
 335 #ifdef SERIAL_DEBUG_OPEN
 336                         printk("doing serial hangup...");
 337 #endif
 338                         if (port->tty)
 339                                 tty_hangup(port->tty);
 340                 }
 341         }
 342         if (tty_port_cts_enabled(port)) {
 343                 if (port->tty->hw_stopped) {
 344                         if (!(status & SER_CTS)) {
 345 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 346                                 printk("CTS tx start...");
 347 #endif
 348                                 port->tty->hw_stopped = false;
 349                                 info->IER |= UART_IER_THRI;
 350                                 amiga_custom.intena = IF_SETCLR | IF_TBE;
 351                                 mb();
 352                                 /* set a pending Tx Interrupt, transmitter should restart now */
 353                                 amiga_custom.intreq = IF_SETCLR | IF_TBE;
 354                                 mb();
 355                                 tty_wakeup(port->tty);
 356                                 return;
 357                         }
 358                 } else {
 359                         if ((status & SER_CTS)) {
 360 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 361                                 printk("CTS tx stop...");
 362 #endif
 363                                 port->tty->hw_stopped = true;
 364                                 info->IER &= ~UART_IER_THRI;
 365                                 /* disable Tx interrupt and remove any pending interrupts */
 366                                 amiga_custom.intena = IF_TBE;
 367                                 mb();
 368                                 amiga_custom.intreq = IF_TBE;
 369                                 mb();
 370                         }
 371                 }
 372         }
 373 }
 374
 375 static irqreturn_t ser_vbl_int( int irq, void *data)
 376 {
 377         /* vbl is just a periodic interrupt we tie into to update modem status */
 378         struct serial_state *info = data;
 379         /*
 380          * TBD - is it better to unregister from this interrupt or to
 381          * ignore it if MSI is clear ?
 382          */
 383         if(info->IER & UART_IER_MSI)
 384           check_modem_status(info);
 385         return IRQ_HANDLED;
 386 }
 387
 388 static irqreturn_t ser_rx_int(int irq, void *dev_id)
 389 {
 390         struct serial_state *info = dev_id;
 391
 392 #ifdef SERIAL_DEBUG_INTR
 393         printk("ser_rx_int...");
 394 #endif
 395
 396         if (!info->tport.tty)
 397                 return IRQ_NONE;
 398
 399         receive_chars(info);
 400 #ifdef SERIAL_DEBUG_INTR
 401         printk("end.\n");
 402 #endif
 403         return IRQ_HANDLED;
 404 }
 405
 406 static irqreturn_t ser_tx_int(int irq, void *dev_id)
 407 {
 408         struct serial_state *info = dev_id;
 409
 410         if (amiga_custom.serdatr & SDR_TBE) {
 411 #ifdef SERIAL_DEBUG_INTR
 412           printk("ser_tx_int...");
 413 #endif
 414
 415           if (!info->tport.tty)
 416                 return IRQ_NONE;
 417
 418           transmit_chars(info);
 419 #ifdef SERIAL_DEBUG_INTR
 420           printk("end.\n");
 421 #endif
 422         }
 423         return IRQ_HANDLED;
 424 }
 425
 426 /*
 427  * -------------------------------------------------------------------
 428  * Here ends the serial interrupt routines.
 429  * -------------------------------------------------------------------
 430  */
 431
 432 /*
 433  * ---------------------------------------------------------------
 434  * Low level utility subroutines for the serial driver:  routines to
 435  * figure out the appropriate timeout for an interrupt chain, routines
 436  * to initialize and startup a serial port, and routines to shutdown a
 437  * serial port.  Useful stuff like that.
 438  * ---------------------------------------------------------------
 439  */
 440
 441 static int startup(struct tty_struct *tty, struct serial_state *info)
 442 {
 443         struct tty_port *port = &info->tport;
 444         unsigned long flags;
 445         int     retval=0;
 446         unsigned long page;
 447
 448         page = get_zeroed_page(GFP_KERNEL);
 449         if (!page)
 450                 return -ENOMEM;
 451
 452         local_irq_save(flags);
 453
 454         if (tty_port_initialized(port)) {
 455                 free_page(page);
 456                 goto errout;
 457         }
 458
 459         if (info->xmit.buf)
 460                 free_page(page);
 461         else
 462                 info->xmit.buf = (unsigned char *) page;
 463
 464 #ifdef SERIAL_DEBUG_OPEN
 465         printk("starting up ttys%d ...", info->line);
 466 #endif
 467
 468         /* Clear anything in the input buffer */
 469
 470         amiga_custom.intreq = IF_RBF;
 471         mb();
 472
 473         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
 474         if (retval) {
 475                 if (capable(CAP_SYS_ADMIN)) {
 476                         set_bit(TTY_IO_ERROR, &tty->flags);
 477                         retval = 0;
 478                 }
 479                 goto errout;
 480         }
 481
 482         /* enable both Rx and Tx interrupts */
 483         amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
 484         mb();
 485         info->IER = UART_IER_MSI;
 486
 487         /* remember current state of the DCD and CTS bits */
 488         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 489
 490         info->MCR = 0;
 491         if (C_BAUD(tty))
 492           info->MCR = SER_DTR | SER_RTS;
 493         rtsdtr_ctrl(info->MCR);
 494
 495         clear_bit(TTY_IO_ERROR, &tty->flags);
 496         info->xmit.head = info->xmit.tail = 0;
 497
 498         /*
 499          * and set the speed of the serial port
 500          */
 501         change_speed(tty, info, NULL);
 502
 503         tty_port_set_initialized(port, true);
 504         local_irq_restore(flags);
 505         return 0;
 506
 507 errout:
 508         local_irq_restore(flags);
 509         return retval;
 510 }
 511
 512 /*
 513  * This routine will shutdown a serial port; interrupts are disabled, and
 514  * DTR is dropped if the hangup on close termio flag is on.
 515  */
 516 static void shutdown(struct tty_struct *tty, struct serial_state *info)
 517 {
 518         unsigned long   flags;
 519
 520         if (!tty_port_initialized(&info->tport))
 521                 return;
 522
 523 #ifdef SERIAL_DEBUG_OPEN
 524         printk("Shutting down serial port %d ....\n", info->line);
 525 #endif
 526
 527         local_irq_save(flags); /* Disable interrupts */
 528
 529         /*
 530          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 531          * here so the queue might never be waken up
 532          */
 533         wake_up_interruptible(&info->tport.delta_msr_wait);
 534
 535         /*
 536          * Free the IRQ, if necessary
 537          */
 538         free_irq(IRQ_AMIGA_VERTB, info);
 539
 540         free_page((unsigned long)info->xmit.buf);
 541         info->xmit.buf = NULL;
 542
 543         info->IER = 0;
 544         amiga_custom.intena = IF_RBF | IF_TBE;
 545         mb();
 546
 547         /* disable break condition */
 548         amiga_custom.adkcon = AC_UARTBRK;
 549         mb();
 550
 551         if (C_HUPCL(tty))
 552                 info->MCR &= ~(SER_DTR|SER_RTS);
 553         rtsdtr_ctrl(info->MCR);
 554
 555         set_bit(TTY_IO_ERROR, &tty->flags);
 556
 557         tty_port_set_initialized(&info->tport, false);
 558         local_irq_restore(flags);
 559 }
 560
 561
 562 /*
 563  * This routine is called to set the UART divisor registers to match
 564  * the specified baud rate for a serial port.
 565  */
 566 static void change_speed(struct tty_struct *tty, struct serial_state *info,
 567                          const struct ktermios *old_termios)
 568 {
 569         struct tty_port *port = &info->tport;
 570         int     quot = 0, baud_base, baud;
 571         unsigned cflag, cval = 0;
 572         int     bits;
 573         unsigned long   flags;
 574
 575         cflag = tty->termios.c_cflag;
 576
 577         /* Byte size is always 8 bits plus parity bit if requested */
 578
 579         cval = 3; bits = 10;
 580         if (cflag & CSTOPB) {
 581                 cval |= 0x04;
 582                 bits++;
 583         }
 584         if (cflag & PARENB) {
 585                 cval |= UART_LCR_PARITY;
 586                 bits++;
 587         }
 588         if (!(cflag & PARODD))
 589                 cval |= UART_LCR_EPAR;
 590         if (cflag & CMSPAR)
 591                 cval |= UART_LCR_SPAR;
 592
 593         /* Determine divisor based on baud rate */
 594         baud = tty_get_baud_rate(tty);
 595         if (!baud)
 596                 baud = 9600;    /* B0 transition handled in rs_set_termios */
 597         baud_base = info->baud_base;
 598         if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 599                 quot = info->custom_divisor;
 600         else {
 601                 if (baud == 134)
 602                         /* Special case since 134 is really 134.5 */
 603                         quot = (2*baud_base / 269);
 604                 else if (baud)
 605                         quot = baud_base / baud;
 606         }
 607         /* If the quotient is zero refuse the change */
 608         if (!quot && old_termios) {
 609                 /* FIXME: Will need updating for new tty in the end */
 610                 tty->termios.c_cflag &= ~CBAUD;
 611                 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
 612                 baud = tty_get_baud_rate(tty);
 613                 if (!baud)
 614                         baud = 9600;
 615                 if (baud == 38400 &&
 616                     (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 617                         quot = info->custom_divisor;
 618                 else {
 619                         if (baud == 134)
 620                                 /* Special case since 134 is really 134.5 */
 621                                 quot = (2*baud_base / 269);
 622                         else if (baud)
 623                                 quot = baud_base / baud;
 624                 }
 625         }
 626         /* As a last resort, if the quotient is zero, default to 9600 bps */
 627         if (!quot)
 628                 quot = baud_base / 9600;
 629         info->quot = quot;
 630         info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base;
 631         info->timeout += HZ/50;         /* Add .02 seconds of slop */
 632
 633         /* CTS flow control flag and modem status interrupts */
 634         info->IER &= ~UART_IER_MSI;
 635         if (port->flags & ASYNC_HARDPPS_CD)
 636                 info->IER |= UART_IER_MSI;
 637         tty_port_set_cts_flow(port, cflag & CRTSCTS);
 638         if (cflag & CRTSCTS)
 639                 info->IER |= UART_IER_MSI;
 640         tty_port_set_check_carrier(port, ~cflag & CLOCAL);
 641         if (~cflag & CLOCAL)
 642                 info->IER |= UART_IER_MSI;
 643         /* TBD:
 644          * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
 645          */
 646
 647         /*
 648          * Set up parity check flag
 649          */
 650
 651         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
 652         if (I_INPCK(tty))
 653                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 654         if (I_BRKINT(tty) || I_PARMRK(tty))
 655                 info->read_status_mask |= UART_LSR_BI;
 656
 657         /*
 658          * Characters to ignore
 659          */
 660         info->ignore_status_mask = 0;
 661         if (I_IGNPAR(tty))
 662                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 663         if (I_IGNBRK(tty)) {
 664                 info->ignore_status_mask |= UART_LSR_BI;
 665                 /*
 666                  * If we're ignore parity and break indicators, ignore
 667                  * overruns too.  (For real raw support).
 668                  */
 669                 if (I_IGNPAR(tty))
 670                         info->ignore_status_mask |= UART_LSR_OE;
 671         }
 672         /*
 673          * !!! ignore all characters if CREAD is not set
 674          */
 675         if ((cflag & CREAD) == 0)
 676                 info->ignore_status_mask |= UART_LSR_DR;
 677         local_irq_save(flags);
 678
 679         {
 680           short serper;
 681
 682         /* Set up the baud rate */
 683           serper = quot - 1;
 684
 685         /* Enable or disable parity bit */
 686
 687         if(cval & UART_LCR_PARITY)
 688           serper |= (SERPER_PARENB);
 689
 690         amiga_custom.serper = serper;
 691         mb();
 692         }
 693
 694         local_irq_restore(flags);
 695 }
 696
 697 static int rs_put_char(struct tty_struct *tty, u8 ch)
 698 {
 699         struct serial_state *info;
 700         unsigned long flags;
 701
 702         info = tty->driver_data;
 703
 704         if (!info->xmit.buf)
 705                 return 0;
 706
 707         local_irq_save(flags);
 708         if (CIRC_SPACE(info->xmit.head,
 709                        info->xmit.tail,
 710                        UART_XMIT_SIZE) == 0) {
 711                 local_irq_restore(flags);
 712                 return 0;
 713         }
 714
 715         info->xmit.buf[info->xmit.head++] = ch;
 716         info->xmit.head &= UART_XMIT_SIZE - 1;
 717         local_irq_restore(flags);
 718         return 1;
 719 }
 720
 721 static void rs_flush_chars(struct tty_struct *tty)
 722 {
 723         struct serial_state *info = tty->driver_data;
 724         unsigned long flags;
 725
 726         if (info->xmit.head == info->xmit.tail
 727             || tty->flow.stopped
 728             || tty->hw_stopped
 729             || !info->xmit.buf)
 730                 return;
 731
 732         local_irq_save(flags);
 733         info->IER |= UART_IER_THRI;
 734         amiga_custom.intena = IF_SETCLR | IF_TBE;
 735         mb();
 736         /* set a pending Tx Interrupt, transmitter should restart now */
 737         amiga_custom.intreq = IF_SETCLR | IF_TBE;
 738         mb();
 739         local_irq_restore(flags);
 740 }
 741
 742 static ssize_t rs_write(struct tty_struct * tty, const u8 *buf, size_t count)
 743 {
 744         int     c, ret = 0;
 745         struct serial_state *info = tty->driver_data;
 746         unsigned long flags;
 747
 748         if (!info->xmit.buf)
 749                 return 0;
 750
 751         local_irq_save(flags);
 752         while (1) {
 753                 c = CIRC_SPACE_TO_END(info->xmit.head,
 754                                       info->xmit.tail,
 755                                       UART_XMIT_SIZE);
 756                 if (count < c)
 757                         c = count;
 758                 if (c <= 0) {
 759                         break;
 760                 }
 761                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 762                 info->xmit.head = (info->xmit.head + c) & (UART_XMIT_SIZE - 1);
 763                 buf += c;
 764                 count -= c;
 765                 ret += c;
 766         }
 767         local_irq_restore(flags);
 768
 769         if (info->xmit.head != info->xmit.tail
 770             && !tty->flow.stopped
 771             && !tty->hw_stopped
 772             && !(info->IER & UART_IER_THRI)) {
 773                 info->IER |= UART_IER_THRI;
 774                 local_irq_disable();
 775                 amiga_custom.intena = IF_SETCLR | IF_TBE;
 776                 mb();
 777                 /* set a pending Tx Interrupt, transmitter should restart now */
 778                 amiga_custom.intreq = IF_SETCLR | IF_TBE;
 779                 mb();
 780                 local_irq_restore(flags);
 781         }
 782         return ret;
 783 }
 784
 785 static unsigned int rs_write_room(struct tty_struct *tty)
 786 {
 787         struct serial_state *info = tty->driver_data;
 788
 789         return CIRC_SPACE(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
 790 }
 791
 792 static unsigned int rs_chars_in_buffer(struct tty_struct *tty)
 793 {
 794         struct serial_state *info = tty->driver_data;
 795
 796         return CIRC_CNT(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
 797 }
 798
 799 static void rs_flush_buffer(struct tty_struct *tty)
 800 {
 801         struct serial_state *info = tty->driver_data;
 802         unsigned long flags;
 803
 804         local_irq_save(flags);
 805         info->xmit.head = info->xmit.tail = 0;
 806         local_irq_restore(flags);
 807         tty_wakeup(tty);
 808 }
 809
 810 /*
 811  * This function is used to send a high-priority XON/XOFF character to
 812  * the device
 813  */
 814 static void rs_send_xchar(struct tty_struct *tty, u8 ch)
 815 {
 816         struct serial_state *info = tty->driver_data;
 817         unsigned long flags;
 818
 819         info->x_char = ch;
 820         if (ch) {
 821                 /* Make sure transmit interrupts are on */
 822
 823                 /* Check this ! */
 824                 local_irq_save(flags);
 825                 if(!(amiga_custom.intenar & IF_TBE)) {
 826                     amiga_custom.intena = IF_SETCLR | IF_TBE;
 827                     mb();
 828                     /* set a pending Tx Interrupt, transmitter should restart now */
 829                     amiga_custom.intreq = IF_SETCLR | IF_TBE;
 830                     mb();
 831                 }
 832                 local_irq_restore(flags);
 833
 834                 info->IER |= UART_IER_THRI;
 835         }
 836 }
 837
 838 /*
 839  * ------------------------------------------------------------
 840  * rs_throttle()
 841  *
 842  * This routine is called by the upper-layer tty layer to signal that
 843  * incoming characters should be throttled.
 844  * ------------------------------------------------------------
 845  */
 846 static void rs_throttle(struct tty_struct * tty)
 847 {
 848         struct serial_state *info = tty->driver_data;
 849         unsigned long flags;
 850 #ifdef SERIAL_DEBUG_THROTTLE
 851         printk("throttle %s ....\n", tty_name(tty));
 852 #endif
 853
 854         if (I_IXOFF(tty))
 855                 rs_send_xchar(tty, STOP_CHAR(tty));
 856
 857         if (C_CRTSCTS(tty))
 858                 info->MCR &= ~SER_RTS;
 859
 860         local_irq_save(flags);
 861         rtsdtr_ctrl(info->MCR);
 862         local_irq_restore(flags);
 863 }
 864
 865 static void rs_unthrottle(struct tty_struct * tty)
 866 {
 867         struct serial_state *info = tty->driver_data;
 868         unsigned long flags;
 869 #ifdef SERIAL_DEBUG_THROTTLE
 870         printk("unthrottle %s ....\n", tty_name(tty));
 871 #endif
 872
 873         if (I_IXOFF(tty)) {
 874                 if (info->x_char)
 875                         info->x_char = 0;
 876                 else
 877                         rs_send_xchar(tty, START_CHAR(tty));
 878         }
 879         if (C_CRTSCTS(tty))
 880                 info->MCR |= SER_RTS;
 881         local_irq_save(flags);
 882         rtsdtr_ctrl(info->MCR);
 883         local_irq_restore(flags);
 884 }
 885
 886 /*
 887  * ------------------------------------------------------------
 888  * rs_ioctl() and friends
 889  * ------------------------------------------------------------
 890  */
 891
 892 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 893 {
 894         struct serial_state *state = tty->driver_data;
 895         unsigned int close_delay, closing_wait;
 896
 897         tty_lock(tty);
 898         close_delay = jiffies_to_msecs(state->tport.close_delay) / 10;
 899         closing_wait = state->tport.closing_wait;
 900         if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
 901                 closing_wait = jiffies_to_msecs(closing_wait) / 10;
 902
 903         ss->line = tty->index;
 904         ss->port = state->port;
 905         ss->flags = state->tport.flags;
 906         ss->xmit_fifo_size = XMIT_FIFO_SIZE;
 907         ss->baud_base = state->baud_base;
 908         ss->close_delay = close_delay;
 909         ss->closing_wait = closing_wait;
 910         ss->custom_divisor = state->custom_divisor;
 911         tty_unlock(tty);
 912         return 0;
 913 }
 914
 915 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 916 {
 917         struct serial_state *state = tty->driver_data;
 918         struct tty_port *port = &state->tport;
 919         bool change_spd;
 920         int                     retval = 0;
 921         unsigned int close_delay, closing_wait;
 922
 923         tty_lock(tty);
 924         change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
 925                 ss->custom_divisor != state->custom_divisor;
 926         if (ss->irq || ss->port != state->port ||
 927                         ss->xmit_fifo_size != XMIT_FIFO_SIZE) {
 928                 tty_unlock(tty);
 929                 return -EINVAL;
 930         }
 931
 932         close_delay = msecs_to_jiffies(ss->close_delay * 10);
 933         closing_wait = ss->closing_wait;
 934         if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
 935                 closing_wait = msecs_to_jiffies(closing_wait * 10);
 936
 937         if (!capable(CAP_SYS_ADMIN)) {
 938                 if ((ss->baud_base != state->baud_base) ||
 939                     (close_delay != port->close_delay) ||
 940                     (closing_wait != port->closing_wait) ||
 941                     ((ss->flags & ~ASYNC_USR_MASK) !=
 942                      (port->flags & ~ASYNC_USR_MASK))) {
 943                         tty_unlock(tty);
 944                         return -EPERM;
 945                 }
 946                 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
 947                                (ss->flags & ASYNC_USR_MASK));
 948                 state->custom_divisor = ss->custom_divisor;
 949                 goto check_and_exit;
 950         }
 951
 952         if (ss->baud_base < 9600) {
 953                 tty_unlock(tty);
 954                 return -EINVAL;
 955         }
 956
 957         /*
 958          * OK, past this point, all the error checking has been done.
 959          * At this point, we start making changes.....
 960          */
 961
 962         state->baud_base = ss->baud_base;
 963         port->flags = ((port->flags & ~ASYNC_FLAGS) |
 964                         (ss->flags & ASYNC_FLAGS));
 965         state->custom_divisor = ss->custom_divisor;
 966         port->close_delay = close_delay;
 967         port->closing_wait = closing_wait;
 968
 969 check_and_exit:
 970         if (tty_port_initialized(port)) {
 971                 if (change_spd) {
 972                         /* warn about deprecation unless clearing */
 973                         if (ss->flags & ASYNC_SPD_MASK)
 974                                 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
 975                         change_speed(tty, state, NULL);
 976                 }
 977         } else
 978                 retval = startup(tty, state);
 979         tty_unlock(tty);
 980         return retval;
 981 }
 982
 983 /*
 984  * get_lsr_info - get line status register info
 985  *
 986  * Purpose: Let user call ioctl() to get info when the UART physically
 987  *          is emptied.  On bus types like RS485, the transmitter must
 988  *          release the bus after transmitting. This must be done when
 989  *          the transmit shift register is empty, not be done when the
 990  *          transmit holding register is empty.  This functionality
 991  *          allows an RS485 driver to be written in user space.
 992  */
 993 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
 994 {
 995         unsigned char status;
 996         unsigned int result;
 997         unsigned long flags;
 998
 999         local_irq_save(flags);
1000         status = amiga_custom.serdatr;
1001         mb();
1002         local_irq_restore(flags);
1003         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1004         if (copy_to_user(value, &result, sizeof(int)))
1005                 return -EFAULT;
1006         return 0;
1007 }
1008
1009
1010 static int rs_tiocmget(struct tty_struct *tty)
1011 {
1012         struct serial_state *info = tty->driver_data;
1013         unsigned char control, status;
1014         unsigned long flags;
1015
1016         if (tty_io_error(tty))
1017                 return -EIO;
1018
1019         control = info->MCR;
1020         local_irq_save(flags);
1021         status = ciab.pra;
1022         local_irq_restore(flags);
1023         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1024                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1025                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1026                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1027                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1028 }
1029
1030 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1031                                                 unsigned int clear)
1032 {
1033         struct serial_state *info = tty->driver_data;
1034         unsigned long flags;
1035
1036         if (tty_io_error(tty))
1037                 return -EIO;
1038
1039         local_irq_save(flags);
1040         if (set & TIOCM_RTS)
1041                 info->MCR |= SER_RTS;
1042         if (set & TIOCM_DTR)
1043                 info->MCR |= SER_DTR;
1044         if (clear & TIOCM_RTS)
1045                 info->MCR &= ~SER_RTS;
1046         if (clear & TIOCM_DTR)
1047                 info->MCR &= ~SER_DTR;
1048         rtsdtr_ctrl(info->MCR);
1049         local_irq_restore(flags);
1050         return 0;
1051 }
1052
1053 /*
1054  * rs_break() --- routine which turns the break handling on or off
1055  */
1056 static int rs_break(struct tty_struct *tty, int break_state)
1057 {
1058         unsigned long flags;
1059
1060         local_irq_save(flags);
1061         if (break_state == -1)
1062           amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK;
1063         else
1064           amiga_custom.adkcon = AC_UARTBRK;
1065         mb();
1066         local_irq_restore(flags);
1067         return 0;
1068 }
1069
1070 /*
1071  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1072  * Return: write counters to the user passed counter struct
1073  * NB: both 1->0 and 0->1 transitions are counted except for
1074  *     RI where only 0->1 is counted.
1075  */
1076 static int rs_get_icount(struct tty_struct *tty,
1077                                 struct serial_icounter_struct *icount)
1078 {
1079         struct serial_state *info = tty->driver_data;
1080         struct async_icount cnow;
1081         unsigned long flags;
1082
1083         local_irq_save(flags);
1084         cnow = info->icount;
1085         local_irq_restore(flags);
1086         icount->cts = cnow.cts;
1087         icount->dsr = cnow.dsr;
1088         icount->rng = cnow.rng;
1089         icount->dcd = cnow.dcd;
1090         icount->rx = cnow.rx;
1091         icount->tx = cnow.tx;
1092         icount->frame = cnow.frame;
1093         icount->overrun = cnow.overrun;
1094         icount->parity = cnow.parity;
1095         icount->brk = cnow.brk;
1096         icount->buf_overrun = cnow.buf_overrun;
1097
1098         return 0;
1099 }
1100
1101 static int rs_ioctl(struct tty_struct *tty,
1102                     unsigned int cmd, unsigned long arg)
1103 {
1104         struct serial_state *info = tty->driver_data;
1105         struct async_icount cprev, cnow;        /* kernel counter temps */
1106         void __user *argp = (void __user *)arg;
1107         unsigned long flags;
1108         DEFINE_WAIT(wait);
1109         int ret;
1110
1111         if ((cmd != TIOCSERCONFIG) &&
1112             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1113                 if (tty_io_error(tty))
1114                     return -EIO;
1115         }
1116
1117         switch (cmd) {
1118                 case TIOCSERCONFIG:
1119                         return 0;
1120
1121                 case TIOCSERGETLSR: /* Get line status register */
1122                         return get_lsr_info(info, argp);
1123
1124                 /*
1125                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1126                  * - mask passed in arg for lines of interest
1127                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1128                  * Caller should use TIOCGICOUNT to see which one it was
1129                  */
1130                 case TIOCMIWAIT:
1131                         local_irq_save(flags);
1132                         /* note the counters on entry */
1133                         cprev = info->icount;
1134                         local_irq_restore(flags);
1135                         while (1) {
1136                                 prepare_to_wait(&info->tport.delta_msr_wait,
1137                                                 &wait, TASK_INTERRUPTIBLE);
1138                                 local_irq_save(flags);
1139                                 cnow = info->icount; /* atomic copy */
1140                                 local_irq_restore(flags);
1141                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1142                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1143                                         ret = -EIO; /* no change => error */
1144                                         break;
1145                                 }
1146                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1147                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1148                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1149                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1150                                         ret = 0;
1151                                         break;
1152                                 }
1153                                 schedule();
1154                                 /* see if a signal did it */
1155                                 if (signal_pending(current)) {
1156                                         ret = -ERESTARTSYS;
1157                                         break;
1158                                 }
1159                                 cprev = cnow;
1160                         }
1161                         finish_wait(&info->tport.delta_msr_wait, &wait);
1162                         return ret;
1163
1164                 default:
1165                         return -ENOIOCTLCMD;
1166                 }
1167         return 0;
1168 }
1169
1170 static void rs_set_termios(struct tty_struct *tty, const struct ktermios *old_termios)
1171 {
1172         struct serial_state *info = tty->driver_data;
1173         unsigned long flags;
1174         unsigned int cflag = tty->termios.c_cflag;
1175
1176         change_speed(tty, info, old_termios);
1177
1178         /* Handle transition to B0 status */
1179         if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1180                 info->MCR &= ~(SER_DTR|SER_RTS);
1181                 local_irq_save(flags);
1182                 rtsdtr_ctrl(info->MCR);
1183                 local_irq_restore(flags);
1184         }
1185
1186         /* Handle transition away from B0 status */
1187         if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1188                 info->MCR |= SER_DTR;
1189                 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1190                         info->MCR |= SER_RTS;
1191                 local_irq_save(flags);
1192                 rtsdtr_ctrl(info->MCR);
1193                 local_irq_restore(flags);
1194         }
1195
1196         /* Handle turning off CRTSCTS */
1197         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1198                 tty->hw_stopped = false;
1199                 rs_start(tty);
1200         }
1201
1202 #if 0
1203         /*
1204          * No need to wake up processes in open wait, since they
1205          * sample the CLOCAL flag once, and don't recheck it.
1206          * XXX  It's not clear whether the current behavior is correct
1207          * or not.  Hence, this may change.....
1208          */
1209         if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1210                 wake_up_interruptible(&info->open_wait);
1211 #endif
1212 }
1213
1214 /*
1215  * ------------------------------------------------------------
1216  * rs_close()
1217  *
1218  * This routine is called when the serial port gets closed.  First, we
1219  * wait for the last remaining data to be sent.  Then, we unlink its
1220  * async structure from the interrupt chain if necessary, and we free
1221  * that IRQ if nothing is left in the chain.
1222  * ------------------------------------------------------------
1223  */
1224 static void rs_close(struct tty_struct *tty, struct file * filp)
1225 {
1226         struct serial_state *state = tty->driver_data;
1227         struct tty_port *port = &state->tport;
1228
1229         if (tty_port_close_start(port, tty, filp) == 0)
1230                 return;
1231
1232         /*
1233          * At this point we stop accepting input.  To do this, we
1234          * disable the receive line status interrupts, and tell the
1235          * interrupt driver to stop checking the data ready bit in the
1236          * line status register.
1237          */
1238         state->read_status_mask &= ~UART_LSR_DR;
1239         if (tty_port_initialized(port)) {
1240                 /* disable receive interrupts */
1241                 amiga_custom.intena = IF_RBF;
1242                 mb();
1243                 /* clear any pending receive interrupt */
1244                 amiga_custom.intreq = IF_RBF;
1245                 mb();
1246
1247                 /*
1248                  * Before we drop DTR, make sure the UART transmitter
1249                  * has completely drained; this is especially
1250                  * important if there is a transmit FIFO!
1251                  */
1252                 rs_wait_until_sent(tty, state->timeout);
1253         }
1254         shutdown(tty, state);
1255         rs_flush_buffer(tty);
1256
1257         tty_ldisc_flush(tty);
1258         port->tty = NULL;
1259
1260         tty_port_close_end(port, tty);
1261 }
1262
1263 /*
1264  * rs_wait_until_sent() --- wait until the transmitter is empty
1265  */
1266 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1267 {
1268         struct serial_state *info = tty->driver_data;
1269         unsigned long orig_jiffies, char_time;
1270         int lsr;
1271
1272         orig_jiffies = jiffies;
1273
1274         /*
1275          * Set the check interval to be 1/5 of the estimated time to
1276          * send a single character, and make it at least 1.  The check
1277          * interval should also be less than the timeout.
1278          *
1279          * Note: we have to use pretty tight timings here to satisfy
1280          * the NIST-PCTS.
1281          */
1282         char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
1283         char_time = char_time / 5;
1284         if (char_time == 0)
1285                 char_time = 1;
1286         if (timeout)
1287           char_time = min_t(unsigned long, char_time, timeout);
1288         /*
1289          * If the transmitter hasn't cleared in twice the approximate
1290          * amount of time to send the entire FIFO, it probably won't
1291          * ever clear.  This assumes the UART isn't doing flow
1292          * control, which is currently the case.  Hence, if it ever
1293          * takes longer than info->timeout, this is probably due to a
1294          * UART bug of some kind.  So, we clamp the timeout parameter at
1295          * 2*info->timeout.
1296          */
1297         if (!timeout || timeout > 2*info->timeout)
1298                 timeout = 2*info->timeout;
1299 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1300         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1301         printk("jiff=%lu...", jiffies);
1302 #endif
1303         while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
1304 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1305                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1306 #endif
1307                 msleep_interruptible(jiffies_to_msecs(char_time));
1308                 if (signal_pending(current))
1309                         break;
1310                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1311                         break;
1312         }
1313         __set_current_state(TASK_RUNNING);
1314
1315 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1316         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1317 #endif
1318 }
1319
1320 /*
1321  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1322  */
1323 static void rs_hangup(struct tty_struct *tty)
1324 {
1325         struct serial_state *info = tty->driver_data;
1326
1327         rs_flush_buffer(tty);
1328         shutdown(tty, info);
1329         info->tport.count = 0;
1330         tty_port_set_active(&info->tport, false);
1331         info->tport.tty = NULL;
1332         wake_up_interruptible(&info->tport.open_wait);
1333 }
1334
1335 /*
1336  * This routine is called whenever a serial port is opened.  It
1337  * enables interrupts for a serial port, linking in its async structure into
1338  * the IRQ chain.   It also performs the serial-specific
1339  * initialization for the tty structure.
1340  */
1341 static int rs_open(struct tty_struct *tty, struct file * filp)
1342 {
1343         struct tty_port *port = tty->port;
1344         struct serial_state *info = container_of(port, struct serial_state,
1345                         tport);
1346         int retval;
1347
1348         port->count++;
1349         port->tty = tty;
1350         tty->driver_data = info;
1351
1352         retval = startup(tty, info);
1353         if (retval) {
1354                 return retval;
1355         }
1356
1357         return tty_port_block_til_ready(port, tty, filp);
1358 }
1359
1360 /*
1361  * /proc fs routines....
1362  */
1363
1364 static inline void line_info(struct seq_file *m, int line,
1365                 struct serial_state *state)
1366 {
1367         char    stat_buf[30], control, status;
1368         unsigned long flags;
1369
1370         seq_printf(m, "%d: uart:amiga_builtin", line);
1371
1372         local_irq_save(flags);
1373         status = ciab.pra;
1374         control = tty_port_initialized(&state->tport) ? state->MCR : status;
1375         local_irq_restore(flags);
1376
1377         stat_buf[0] = 0;
1378         stat_buf[1] = 0;
1379         if(!(control & SER_RTS))
1380                 strcat(stat_buf, "|RTS");
1381         if(!(status & SER_CTS))
1382                 strcat(stat_buf, "|CTS");
1383         if(!(control & SER_DTR))
1384                 strcat(stat_buf, "|DTR");
1385         if(!(status & SER_DSR))
1386                 strcat(stat_buf, "|DSR");
1387         if(!(status & SER_DCD))
1388                 strcat(stat_buf, "|CD");
1389
1390         if (state->quot)
1391                 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1392
1393         seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1394
1395         if (state->icount.frame)
1396                 seq_printf(m, " fe:%d", state->icount.frame);
1397
1398         if (state->icount.parity)
1399                 seq_printf(m, " pe:%d", state->icount.parity);
1400
1401         if (state->icount.brk)
1402                 seq_printf(m, " brk:%d", state->icount.brk);
1403
1404         if (state->icount.overrun)
1405                 seq_printf(m, " oe:%d", state->icount.overrun);
1406
1407         /*
1408          * Last thing is the RS-232 status lines
1409          */
1410         seq_printf(m, " %s\n", stat_buf+1);
1411 }
1412
1413 static int rs_proc_show(struct seq_file *m, void *v)
1414 {
1415         seq_printf(m, "serinfo:1.0 driver:4.30\n");
1416         line_info(m, 0, &serial_state);
1417         return 0;
1418 }
1419
1420 /*
1421  * ---------------------------------------------------------------------
1422  * rs_init() and friends
1423  *
1424  * rs_init() is called at boot-time to initialize the serial driver.
1425  * ---------------------------------------------------------------------
1426  */
1427
1428 static const struct tty_operations serial_ops = {
1429         .open = rs_open,
1430         .close = rs_close,
1431         .write = rs_write,
1432         .put_char = rs_put_char,
1433         .flush_chars = rs_flush_chars,
1434         .write_room = rs_write_room,
1435         .chars_in_buffer = rs_chars_in_buffer,
1436         .flush_buffer = rs_flush_buffer,
1437         .ioctl = rs_ioctl,
1438         .throttle = rs_throttle,
1439         .unthrottle = rs_unthrottle,
1440         .set_termios = rs_set_termios,
1441         .stop = rs_stop,
1442         .start = rs_start,
1443         .hangup = rs_hangup,
1444         .break_ctl = rs_break,
1445         .send_xchar = rs_send_xchar,
1446         .wait_until_sent = rs_wait_until_sent,
1447         .tiocmget = rs_tiocmget,
1448         .tiocmset = rs_tiocmset,
1449         .get_icount = rs_get_icount,
1450         .set_serial = set_serial_info,
1451         .get_serial = get_serial_info,
1452         .proc_show = rs_proc_show,
1453 };
1454
1455 static bool amiga_carrier_raised(struct tty_port *port)
1456 {
1457         return !(ciab.pra & SER_DCD);
1458 }
1459
1460 static void amiga_dtr_rts(struct tty_port *port, bool active)
1461 {
1462         struct serial_state *info = container_of(port, struct serial_state,
1463                         tport);
1464         unsigned long flags;
1465
1466         if (active)
1467                 info->MCR |= SER_DTR|SER_RTS;
1468         else
1469                 info->MCR &= ~(SER_DTR|SER_RTS);
1470
1471         local_irq_save(flags);
1472         rtsdtr_ctrl(info->MCR);
1473         local_irq_restore(flags);
1474 }
1475
1476 static const struct tty_port_operations amiga_port_ops = {
1477         .carrier_raised = amiga_carrier_raised,
1478         .dtr_rts = amiga_dtr_rts,
1479 };
1480
1481 /*
1482  * The serial driver boot-time initialization code!
1483  */
1484 static int __init amiga_serial_probe(struct platform_device *pdev)
1485 {
1486         struct serial_state *state = &serial_state;
1487         struct tty_driver *driver;
1488         unsigned long flags;
1489         int error;
1490
1491         driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
1492         if (IS_ERR(driver))
1493                 return PTR_ERR(driver);
1494
1495         /* Initialize the tty_driver structure */
1496
1497         driver->driver_name = "amiserial";
1498         driver->name = "ttyS";
1499         driver->major = TTY_MAJOR;
1500         driver->minor_start = 64;
1501         driver->type = TTY_DRIVER_TYPE_SERIAL;
1502         driver->subtype = SERIAL_TYPE_NORMAL;
1503         driver->init_termios = tty_std_termios;
1504         driver->init_termios.c_cflag =
1505                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1506         tty_set_operations(driver, &serial_ops);
1507
1508         memset(state, 0, sizeof(*state));
1509         state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
1510         tty_port_init(&state->tport);
1511         state->tport.ops = &amiga_port_ops;
1512         tty_port_link_device(&state->tport, driver, 0);
1513
1514         error = tty_register_driver(driver);
1515         if (error)
1516                 goto fail_tty_driver_kref_put;
1517
1518         printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1519
1520         /* Hardware set up */
1521
1522         state->baud_base = amiga_colorclock;
1523
1524         /* set ISRs, and then disable the rx interrupts */
1525         error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1526         if (error)
1527                 goto fail_unregister;
1528
1529         error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1530                             "serial RX", state);
1531         if (error)
1532                 goto fail_free_irq;
1533
1534         local_irq_save(flags);
1535
1536         /* turn off Rx and Tx interrupts */
1537         amiga_custom.intena = IF_RBF | IF_TBE;
1538         mb();
1539
1540         /* clear any pending interrupt */
1541         amiga_custom.intreq = IF_RBF | IF_TBE;
1542         mb();
1543
1544         local_irq_restore(flags);
1545
1546         /*
1547          * set the appropriate directions for the modem control flags,
1548          * and clear RTS and DTR
1549          */
1550         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
1551         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
1552
1553         platform_set_drvdata(pdev, state);
1554
1555         serial_driver = driver;
1556
1557         return 0;
1558
1559 fail_free_irq:
1560         free_irq(IRQ_AMIGA_TBE, state);
1561 fail_unregister:
1562         tty_unregister_driver(driver);
1563 fail_tty_driver_kref_put:
1564         tty_port_destroy(&state->tport);
1565         tty_driver_kref_put(driver);
1566         return error;
1567 }
1568
1569 static int __exit amiga_serial_remove(struct platform_device *pdev)
1570 {
1571         struct serial_state *state = platform_get_drvdata(pdev);
1572
1573         tty_unregister_driver(serial_driver);
1574         tty_driver_kref_put(serial_driver);
1575         tty_port_destroy(&state->tport);
1576
1577         free_irq(IRQ_AMIGA_TBE, state);
1578         free_irq(IRQ_AMIGA_RBF, state);
1579
1580         return 0;
1581 }
1582
1583 static struct platform_driver amiga_serial_driver = {
1584         .remove = __exit_p(amiga_serial_remove),
1585         .driver   = {
1586                 .name   = "amiga-serial",
1587         },
1588 };
1589
1590 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1591
1592
1593 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1594
1595 /*
1596  * ------------------------------------------------------------
1597  * Serial console driver
1598  * ------------------------------------------------------------
1599  */
1600
1601 static void amiga_serial_putc(char c)
1602 {
1603         amiga_custom.serdat = (unsigned char)c | 0x100;
1604         while (!(amiga_custom.serdatr & 0x2000))
1605                 barrier();
1606 }
1607
1608 /*
1609  *      Print a string to the serial port trying not to disturb
1610  *      any possible real use of the port...
1611  *
1612  *      The console must be locked when we get here.
1613  */
1614 static void serial_console_write(struct console *co, const char *s,
1615                                 unsigned count)
1616 {
1617         unsigned short intena = amiga_custom.intenar;
1618
1619         amiga_custom.intena = IF_TBE;
1620
1621         while (count--) {
1622                 if (*s == '\n')
1623                         amiga_serial_putc('\r');
1624                 amiga_serial_putc(*s++);
1625         }
1626
1627         amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1628 }
1629
1630 static struct tty_driver *serial_console_device(struct console *c, int *index)
1631 {
1632         *index = 0;
1633         return serial_driver;
1634 }
1635
1636 static struct console sercons = {
1637         .name =         "ttyS",
1638         .write =        serial_console_write,
1639         .device =       serial_console_device,
1640         .flags =        CON_PRINTBUFFER,
1641         .index =        -1,
1642 };
1643
1644 /*
1645  *      Register console.
1646  */
1647 static int __init amiserial_console_init(void)
1648 {
1649         if (!MACH_IS_AMIGA)
1650                 return -ENODEV;
1651
1652         register_console(&sercons);
1653         return 0;
1654 }
1655 console_initcall(amiserial_console_init);
1656
1657 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1658
1659 MODULE_LICENSE("GPL");
1660 MODULE_ALIAS("platform:amiga-serial");