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 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/sched.h>
  55 #include <linux/signal.h>
  56 #include <linux/slab.h>
  57 #include <linux/string.h>
  58 #include <linux/timer.h>
  59 #include <linux/tty_flip.h>
  60 #include <linux/tty.h>
  61 #include <linux/types.h>
  62 #include <linux/uaccess.h>
  63
  64 #include <asm/amigahw.h>
  65 #include <asm/amigaints.h>
  66 #include <asm/irq.h>
  67 #include <asm/setup.h>
  68
  69 struct serial_state {
  70         struct tty_port         tport;
  71         struct circ_buf         xmit;
  72         struct async_icount     icount;
  73
  74         unsigned long           port;
  75         int                     baud_base;
  76         int                     custom_divisor;
  77         int                     read_status_mask;
  78         int                     ignore_status_mask;
  79         int                     timeout;
  80         int                     quot;
  81         int                     IER;    /* Interrupt Enable Register */
  82         int                     MCR;    /* Modem control register */
  83         int                     x_char; /* xon/xoff character */
  84 };
  85
  86 static struct tty_driver *serial_driver;
  87
  88 /* number of characters left in xmit buffer before we ask for more */
  89 #define WAKEUP_CHARS 256
  90
  91 #define XMIT_FIFO_SIZE 1
  92
  93 static unsigned char current_ctl_bits;
  94
  95 static void change_speed(struct tty_struct *tty, struct serial_state *info,
  96                 struct ktermios *old);
  97 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
  98
  99
 100 static struct serial_state serial_state;
 101
 102 /* some serial hardware definitions */
 103 #define SDR_OVRUN   (1<<15)
 104 #define SDR_RBF     (1<<14)
 105 #define SDR_TBE     (1<<13)
 106 #define SDR_TSRE    (1<<12)
 107
 108 #define SERPER_PARENB    (1<<15)
 109
 110 #define AC_SETCLR   (1<<15)
 111 #define AC_UARTBRK  (1<<11)
 112
 113 #define SER_DTR     (1<<7)
 114 #define SER_RTS     (1<<6)
 115 #define SER_DCD     (1<<5)
 116 #define SER_CTS     (1<<4)
 117 #define SER_DSR     (1<<3)
 118
 119 static __inline__ void rtsdtr_ctrl(int bits)
 120 {
 121     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
 122 }
 123
 124 /*
 125  * ------------------------------------------------------------
 126  * rs_stop() and rs_start()
 127  *
 128  * This routines are called before setting or resetting tty->flow.stopped.
 129  * They enable or disable transmitter interrupts, as necessary.
 130  * ------------------------------------------------------------
 131  */
 132 static void rs_stop(struct tty_struct *tty)
 133 {
 134         struct serial_state *info = tty->driver_data;
 135         unsigned long flags;
 136
 137         local_irq_save(flags);
 138         if (info->IER & UART_IER_THRI) {
 139                 info->IER &= ~UART_IER_THRI;
 140                 /* disable Tx interrupt and remove any pending interrupts */
 141                 amiga_custom.intena = IF_TBE;
 142                 mb();
 143                 amiga_custom.intreq = IF_TBE;
 144                 mb();
 145         }
 146         local_irq_restore(flags);
 147 }
 148
 149 static void rs_start(struct tty_struct *tty)
 150 {
 151         struct serial_state *info = tty->driver_data;
 152         unsigned long flags;
 153
 154         local_irq_save(flags);
 155         if (info->xmit.head != info->xmit.tail
 156             && info->xmit.buf
 157             && !(info->IER & UART_IER_THRI)) {
 158                 info->IER |= UART_IER_THRI;
 159                 amiga_custom.intena = IF_SETCLR | IF_TBE;
 160                 mb();
 161                 /* set a pending Tx Interrupt, transmitter should restart now */
 162                 amiga_custom.intreq = IF_SETCLR | IF_TBE;
 163                 mb();
 164         }
 165         local_irq_restore(flags);
 166 }
 167
 168 /*
 169  * ----------------------------------------------------------------------
 170  *
 171  * Here start the interrupt handling routines.
 172  *
 173  * -----------------------------------------------------------------------
 174  */
 175
 176 static void receive_chars(struct serial_state *info)
 177 {
 178         int status;
 179         int serdatr;
 180         unsigned char ch, flag;
 181         struct  async_icount *icount;
 182         int oe = 0;
 183
 184         icount = &info->icount;
 185
 186         status = UART_LSR_DR; /* We obviously have a character! */
 187         serdatr = amiga_custom.serdatr;
 188         mb();
 189         amiga_custom.intreq = IF_RBF;
 190         mb();
 191
 192         if((serdatr & 0x1ff) == 0)
 193             status |= UART_LSR_BI;
 194         if(serdatr & SDR_OVRUN)
 195             status |= UART_LSR_OE;
 196
 197         ch = serdatr & 0xff;
 198         icount->rx++;
 199
 200 #ifdef SERIAL_DEBUG_INTR
 201         printk("DR%02x:%02x...", ch, status);
 202 #endif
 203         flag = TTY_NORMAL;
 204
 205         /*
 206          * We don't handle parity or frame errors - but I have left
 207          * the code in, since I'm not sure that the errors can't be
 208          * detected.
 209          */
 210
 211         if (status & (UART_LSR_BI | UART_LSR_PE |
 212                       UART_LSR_FE | UART_LSR_OE)) {
 213           /*
 214            * For statistics only
 215            */
 216           if (status & UART_LSR_BI) {
 217             status &= ~(UART_LSR_FE | UART_LSR_PE);
 218             icount->brk++;
 219           } else if (status & UART_LSR_PE)
 220             icount->parity++;
 221           else if (status & UART_LSR_FE)
 222             icount->frame++;
 223           if (status & UART_LSR_OE)
 224             icount->overrun++;
 225
 226           /*
 227            * Now check to see if character should be
 228            * ignored, and mask off conditions which
 229            * should be ignored.
 230            */
 231           if (status & info->ignore_status_mask)
 232             goto out;
 233
 234           status &= info->read_status_mask;
 235
 236           if (status & (UART_LSR_BI)) {
 237 #ifdef SERIAL_DEBUG_INTR
 238             printk("handling break....");
 239 #endif
 240             flag = TTY_BREAK;
 241             if (info->tport.flags & ASYNC_SAK)
 242               do_SAK(info->tport.tty);
 243           } else if (status & UART_LSR_PE)
 244             flag = TTY_PARITY;
 245           else if (status & UART_LSR_FE)
 246             flag = TTY_FRAME;
 247           if (status & UART_LSR_OE) {
 248             /*
 249              * Overrun is special, since it's
 250              * reported immediately, and doesn't
 251              * affect the current character
 252              */
 253              oe = 1;
 254           }
 255         }
 256         tty_insert_flip_char(&info->tport, ch, flag);
 257         if (oe == 1)
 258                 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
 259         tty_flip_buffer_push(&info->tport);
 260 out:
 261         return;
 262 }
 263
 264 static void transmit_chars(struct serial_state *info)
 265 {
 266         amiga_custom.intreq = IF_TBE;
 267         mb();
 268         if (info->x_char) {
 269                 amiga_custom.serdat = info->x_char | 0x100;
 270                 mb();
 271                 info->icount.tx++;
 272                 info->x_char = 0;
 273                 return;
 274         }
 275         if (info->xmit.head == info->xmit.tail
 276             || info->tport.tty->flow.stopped
 277             || info->tport.tty->hw_stopped) {
 278                 info->IER &= ~UART_IER_THRI;
 279                 amiga_custom.intena = IF_TBE;
 280                 mb();
 281                 return;
 282         }
 283
 284         amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
 285         mb();
 286         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
 287         info->icount.tx++;
 288
 289         if (CIRC_CNT(info->xmit.head,
 290                      info->xmit.tail,
 291                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
 292                 tty_wakeup(info->tport.tty);
 293
 294 #ifdef SERIAL_DEBUG_INTR
 295         printk("THRE...");
 296 #endif
 297         if (info->xmit.head == info->xmit.tail) {
 298                 amiga_custom.intena = IF_TBE;
 299                 mb();
 300                 info->IER &= ~UART_IER_THRI;
 301         }
 302 }
 303
 304 static void check_modem_status(struct serial_state *info)
 305 {
 306         struct tty_port *port = &info->tport;
 307         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 308         unsigned char dstatus;
 309         struct  async_icount *icount;
 310
 311         /* Determine bits that have changed */
 312         dstatus = status ^ current_ctl_bits;
 313         current_ctl_bits = status;
 314
 315         if (dstatus) {
 316                 icount = &info->icount;
 317                 /* update input line counters */
 318                 if (dstatus & SER_DSR)
 319                         icount->dsr++;
 320                 if (dstatus & SER_DCD) {
 321                         icount->dcd++;
 322                 }
 323                 if (dstatus & SER_CTS)
 324                         icount->cts++;
 325                 wake_up_interruptible(&port->delta_msr_wait);
 326         }
 327
 328         if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
 329 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
 330                 printk("ttyS%d CD now %s...", info->line,
 331                        (!(status & SER_DCD)) ? "on" : "off");
 332 #endif
 333                 if (!(status & SER_DCD))
 334                         wake_up_interruptible(&port->open_wait);
 335                 else {
 336 #ifdef SERIAL_DEBUG_OPEN
 337                         printk("doing serial hangup...");
 338 #endif
 339                         if (port->tty)
 340                                 tty_hangup(port->tty);
 341                 }
 342         }
 343         if (tty_port_cts_enabled(port)) {
 344                 if (port->tty->hw_stopped) {
 345                         if (!(status & SER_CTS)) {
 346 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 347                                 printk("CTS tx start...");
 348 #endif
 349                                 port->tty->hw_stopped = 0;
 350                                 info->IER |= UART_IER_THRI;
 351                                 amiga_custom.intena = IF_SETCLR | IF_TBE;
 352                                 mb();
 353                                 /* set a pending Tx Interrupt, transmitter should restart now */
 354                                 amiga_custom.intreq = IF_SETCLR | IF_TBE;
 355                                 mb();
 356                                 tty_wakeup(port->tty);
 357                                 return;
 358                         }
 359                 } else {
 360                         if ((status & SER_CTS)) {
 361 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 362                                 printk("CTS tx stop...");
 363 #endif
 364                                 port->tty->hw_stopped = 1;
 365                                 info->IER &= ~UART_IER_THRI;
 366                                 /* disable Tx interrupt and remove any pending interrupts */
 367                                 amiga_custom.intena = IF_TBE;
 368                                 mb();
 369                                 amiga_custom.intreq = IF_TBE;
 370                                 mb();
 371                         }
 372                 }
 373         }
 374 }
 375
 376 static irqreturn_t ser_vbl_int( int irq, void *data)
 377 {
 378         /* vbl is just a periodic interrupt we tie into to update modem status */
 379         struct serial_state *info = data;
 380         /*
 381          * TBD - is it better to unregister from this interrupt or to
 382          * ignore it if MSI is clear ?
 383          */
 384         if(info->IER & UART_IER_MSI)
 385           check_modem_status(info);
 386         return IRQ_HANDLED;
 387 }
 388
 389 static irqreturn_t ser_rx_int(int irq, void *dev_id)
 390 {
 391         struct serial_state *info = dev_id;
 392
 393 #ifdef SERIAL_DEBUG_INTR
 394         printk("ser_rx_int...");
 395 #endif
 396
 397         if (!info->tport.tty)
 398                 return IRQ_NONE;
 399
 400         receive_chars(info);
 401 #ifdef SERIAL_DEBUG_INTR
 402         printk("end.\n");
 403 #endif
 404         return IRQ_HANDLED;
 405 }
 406
 407 static irqreturn_t ser_tx_int(int irq, void *dev_id)
 408 {
 409         struct serial_state *info = dev_id;
 410
 411         if (amiga_custom.serdatr & SDR_TBE) {
 412 #ifdef SERIAL_DEBUG_INTR
 413           printk("ser_tx_int...");
 414 #endif
 415
 416           if (!info->tport.tty)
 417                 return IRQ_NONE;
 418
 419           transmit_chars(info);
 420 #ifdef SERIAL_DEBUG_INTR
 421           printk("end.\n");
 422 #endif
 423         }
 424         return IRQ_HANDLED;
 425 }
 426
 427 /*
 428  * -------------------------------------------------------------------
 429  * Here ends the serial interrupt routines.
 430  * -------------------------------------------------------------------
 431  */
 432
 433 /*
 434  * ---------------------------------------------------------------
 435  * Low level utility subroutines for the serial driver:  routines to
 436  * figure out the appropriate timeout for an interrupt chain, routines
 437  * to initialize and startup a serial port, and routines to shutdown a
 438  * serial port.  Useful stuff like that.
 439  * ---------------------------------------------------------------
 440  */
 441
 442 static int startup(struct tty_struct *tty, struct serial_state *info)
 443 {
 444         struct tty_port *port = &info->tport;
 445         unsigned long flags;
 446         int     retval=0;
 447         unsigned long page;
 448
 449         page = get_zeroed_page(GFP_KERNEL);
 450         if (!page)
 451                 return -ENOMEM;
 452
 453         local_irq_save(flags);
 454
 455         if (tty_port_initialized(port)) {
 456                 free_page(page);
 457                 goto errout;
 458         }
 459
 460         if (info->xmit.buf)
 461                 free_page(page);
 462         else
 463                 info->xmit.buf = (unsigned char *) page;
 464
 465 #ifdef SERIAL_DEBUG_OPEN
 466         printk("starting up ttys%d ...", info->line);
 467 #endif
 468
 469         /* Clear anything in the input buffer */
 470
 471         amiga_custom.intreq = IF_RBF;
 472         mb();
 473
 474         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
 475         if (retval) {
 476                 if (capable(CAP_SYS_ADMIN)) {
 477                         set_bit(TTY_IO_ERROR, &tty->flags);
 478                         retval = 0;
 479                 }
 480                 goto errout;
 481         }
 482
 483         /* enable both Rx and Tx interrupts */
 484         amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
 485         mb();
 486         info->IER = UART_IER_MSI;
 487
 488         /* remember current state of the DCD and CTS bits */
 489         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 490
 491         info->MCR = 0;
 492         if (C_BAUD(tty))
 493           info->MCR = SER_DTR | SER_RTS;
 494         rtsdtr_ctrl(info->MCR);
 495
 496         clear_bit(TTY_IO_ERROR, &tty->flags);
 497         info->xmit.head = info->xmit.tail = 0;
 498
 499         /*
 500          * and set the speed of the serial port
 501          */
 502         change_speed(tty, info, NULL);
 503
 504         tty_port_set_initialized(port, 1);
 505         local_irq_restore(flags);
 506         return 0;
 507
 508 errout:
 509         local_irq_restore(flags);
 510         return retval;
 511 }
 512
 513 /*
 514  * This routine will shutdown a serial port; interrupts are disabled, and
 515  * DTR is dropped if the hangup on close termio flag is on.
 516  */
 517 static void shutdown(struct tty_struct *tty, struct serial_state *info)
 518 {
 519         unsigned long   flags;
 520
 521         if (!tty_port_initialized(&info->tport))
 522                 return;
 523
 524 #ifdef SERIAL_DEBUG_OPEN
 525         printk("Shutting down serial port %d ....\n", info->line);
 526 #endif
 527
 528         local_irq_save(flags); /* Disable interrupts */
 529
 530         /*
 531          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 532          * here so the queue might never be waken up
 533          */
 534         wake_up_interruptible(&info->tport.delta_msr_wait);
 535
 536         /*
 537          * Free the IRQ, if necessary
 538          */
 539         free_irq(IRQ_AMIGA_VERTB, info);
 540
 541         free_page((unsigned long)info->xmit.buf);
 542         info->xmit.buf = NULL;
 543
 544         info->IER = 0;
 545         amiga_custom.intena = IF_RBF | IF_TBE;
 546         mb();
 547
 548         /* disable break condition */
 549         amiga_custom.adkcon = AC_UARTBRK;
 550         mb();
 551
 552         if (C_HUPCL(tty))
 553                 info->MCR &= ~(SER_DTR|SER_RTS);
 554         rtsdtr_ctrl(info->MCR);
 555
 556         set_bit(TTY_IO_ERROR, &tty->flags);
 557
 558         tty_port_set_initialized(&info->tport, 0);
 559         local_irq_restore(flags);
 560 }
 561
 562
 563 /*
 564  * This routine is called to set the UART divisor registers to match
 565  * the specified baud rate for a serial port.
 566  */
 567 static void change_speed(struct tty_struct *tty, struct serial_state *info,
 568                          struct ktermios *old_termios)
 569 {
 570         struct tty_port *port = &info->tport;
 571         int     quot = 0, baud_base, baud;
 572         unsigned cflag, cval = 0;
 573         int     bits;
 574         unsigned long   flags;
 575
 576         cflag = tty->termios.c_cflag;
 577
 578         /* Byte size is always 8 bits plus parity bit if requested */
 579
 580         cval = 3; bits = 10;
 581         if (cflag & CSTOPB) {
 582                 cval |= 0x04;
 583                 bits++;
 584         }
 585         if (cflag & PARENB) {
 586                 cval |= UART_LCR_PARITY;
 587                 bits++;
 588         }
 589         if (!(cflag & PARODD))
 590                 cval |= UART_LCR_EPAR;
 591         if (cflag & CMSPAR)
 592                 cval |= UART_LCR_SPAR;
 593
 594         /* Determine divisor based on baud rate */
 595         baud = tty_get_baud_rate(tty);
 596         if (!baud)
 597                 baud = 9600;    /* B0 transition handled in rs_set_termios */
 598         baud_base = info->baud_base;
 599         if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 600                 quot = info->custom_divisor;
 601         else {
 602                 if (baud == 134)
 603                         /* Special case since 134 is really 134.5 */
 604                         quot = (2*baud_base / 269);
 605                 else if (baud)
 606                         quot = baud_base / baud;
 607         }
 608         /* If the quotient is zero refuse the change */
 609         if (!quot && old_termios) {
 610                 /* FIXME: Will need updating for new tty in the end */
 611                 tty->termios.c_cflag &= ~CBAUD;
 612                 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
 613                 baud = tty_get_baud_rate(tty);
 614                 if (!baud)
 615                         baud = 9600;
 616                 if (baud == 38400 &&
 617                     (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 618                         quot = info->custom_divisor;
 619                 else {
 620                         if (baud == 134)
 621                                 /* Special case since 134 is really 134.5 */
 622                                 quot = (2*baud_base / 269);
 623                         else if (baud)
 624                                 quot = baud_base / baud;
 625                 }
 626         }
 627         /* As a last resort, if the quotient is zero, default to 9600 bps */
 628         if (!quot)
 629                 quot = baud_base / 9600;
 630         info->quot = quot;
 631         info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base;
 632         info->timeout += HZ/50;         /* Add .02 seconds of slop */
 633
 634         /* CTS flow control flag and modem status interrupts */
 635         info->IER &= ~UART_IER_MSI;
 636         if (port->flags & ASYNC_HARDPPS_CD)
 637                 info->IER |= UART_IER_MSI;
 638         tty_port_set_cts_flow(port, cflag & CRTSCTS);
 639         if (cflag & CRTSCTS)
 640                 info->IER |= UART_IER_MSI;
 641         tty_port_set_check_carrier(port, ~cflag & CLOCAL);
 642         if (~cflag & CLOCAL)
 643                 info->IER |= UART_IER_MSI;
 644         /* TBD:
 645          * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
 646          */
 647
 648         /*
 649          * Set up parity check flag
 650          */
 651
 652         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
 653         if (I_INPCK(tty))
 654                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 655         if (I_BRKINT(tty) || I_PARMRK(tty))
 656                 info->read_status_mask |= UART_LSR_BI;
 657
 658         /*
 659          * Characters to ignore
 660          */
 661         info->ignore_status_mask = 0;
 662         if (I_IGNPAR(tty))
 663                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 664         if (I_IGNBRK(tty)) {
 665                 info->ignore_status_mask |= UART_LSR_BI;
 666                 /*
 667                  * If we're ignore parity and break indicators, ignore
 668                  * overruns too.  (For real raw support).
 669                  */
 670                 if (I_IGNPAR(tty))
 671                         info->ignore_status_mask |= UART_LSR_OE;
 672         }
 673         /*
 674          * !!! ignore all characters if CREAD is not set
 675          */
 676         if ((cflag & CREAD) == 0)
 677                 info->ignore_status_mask |= UART_LSR_DR;
 678         local_irq_save(flags);
 679
 680         {
 681           short serper;
 682
 683         /* Set up the baud rate */
 684           serper = quot - 1;
 685
 686         /* Enable or disable parity bit */
 687
 688         if(cval & UART_LCR_PARITY)
 689           serper |= (SERPER_PARENB);
 690
 691         amiga_custom.serper = serper;
 692         mb();
 693         }
 694
 695         local_irq_restore(flags);
 696 }
 697
 698 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 699 {
 700         struct serial_state *info;
 701         unsigned long flags;
 702
 703         info = tty->driver_data;
 704
 705         if (!info->xmit.buf)
 706                 return 0;
 707
 708         local_irq_save(flags);
 709         if (CIRC_SPACE(info->xmit.head,
 710                        info->xmit.tail,
 711                        SERIAL_XMIT_SIZE) == 0) {
 712                 local_irq_restore(flags);
 713                 return 0;
 714         }
 715
 716         info->xmit.buf[info->xmit.head++] = ch;
 717         info->xmit.head &= SERIAL_XMIT_SIZE-1;
 718         local_irq_restore(flags);
 719         return 1;
 720 }
 721
 722 static void rs_flush_chars(struct tty_struct *tty)
 723 {
 724         struct serial_state *info = tty->driver_data;
 725         unsigned long flags;
 726
 727         if (info->xmit.head == info->xmit.tail
 728             || tty->flow.stopped
 729             || tty->hw_stopped
 730             || !info->xmit.buf)
 731                 return;
 732
 733         local_irq_save(flags);
 734         info->IER |= UART_IER_THRI;
 735         amiga_custom.intena = IF_SETCLR | IF_TBE;
 736         mb();
 737         /* set a pending Tx Interrupt, transmitter should restart now */
 738         amiga_custom.intreq = IF_SETCLR | IF_TBE;
 739         mb();
 740         local_irq_restore(flags);
 741 }
 742
 743 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
 744 {
 745         int     c, ret = 0;
 746         struct serial_state *info = tty->driver_data;
 747         unsigned long flags;
 748
 749         if (!info->xmit.buf)
 750                 return 0;
 751
 752         local_irq_save(flags);
 753         while (1) {
 754                 c = CIRC_SPACE_TO_END(info->xmit.head,
 755                                       info->xmit.tail,
 756                                       SERIAL_XMIT_SIZE);
 757                 if (count < c)
 758                         c = count;
 759                 if (c <= 0) {
 760                         break;
 761                 }
 762                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 763                 info->xmit.head = ((info->xmit.head + c) &
 764                                    (SERIAL_XMIT_SIZE-1));
 765                 buf += c;
 766                 count -= c;
 767                 ret += c;
 768         }
 769         local_irq_restore(flags);
 770
 771         if (info->xmit.head != info->xmit.tail
 772             && !tty->flow.stopped
 773             && !tty->hw_stopped
 774             && !(info->IER & UART_IER_THRI)) {
 775                 info->IER |= UART_IER_THRI;
 776                 local_irq_disable();
 777                 amiga_custom.intena = IF_SETCLR | IF_TBE;
 778                 mb();
 779                 /* set a pending Tx Interrupt, transmitter should restart now */
 780                 amiga_custom.intreq = IF_SETCLR | IF_TBE;
 781                 mb();
 782                 local_irq_restore(flags);
 783         }
 784         return ret;
 785 }
 786
 787 static unsigned int rs_write_room(struct tty_struct *tty)
 788 {
 789         struct serial_state *info = tty->driver_data;
 790
 791         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 792 }
 793
 794 static unsigned int rs_chars_in_buffer(struct tty_struct *tty)
 795 {
 796         struct serial_state *info = tty->driver_data;
 797
 798         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 799 }
 800
 801 static void rs_flush_buffer(struct tty_struct *tty)
 802 {
 803         struct serial_state *info = tty->driver_data;
 804         unsigned long flags;
 805
 806         local_irq_save(flags);
 807         info->xmit.head = info->xmit.tail = 0;
 808         local_irq_restore(flags);
 809         tty_wakeup(tty);
 810 }
 811
 812 /*
 813  * This function is used to send a high-priority XON/XOFF character to
 814  * the device
 815  */
 816 static void rs_send_xchar(struct tty_struct *tty, char ch)
 817 {
 818         struct serial_state *info = tty->driver_data;
 819         unsigned long flags;
 820
 821         info->x_char = ch;
 822         if (ch) {
 823                 /* Make sure transmit interrupts are on */
 824
 825                 /* Check this ! */
 826                 local_irq_save(flags);
 827                 if(!(amiga_custom.intenar & IF_TBE)) {
 828                     amiga_custom.intena = IF_SETCLR | IF_TBE;
 829                     mb();
 830                     /* set a pending Tx Interrupt, transmitter should restart now */
 831                     amiga_custom.intreq = IF_SETCLR | IF_TBE;
 832                     mb();
 833                 }
 834                 local_irq_restore(flags);
 835
 836                 info->IER |= UART_IER_THRI;
 837         }
 838 }
 839
 840 /*
 841  * ------------------------------------------------------------
 842  * rs_throttle()
 843  *
 844  * This routine is called by the upper-layer tty layer to signal that
 845  * incoming characters should be throttled.
 846  * ------------------------------------------------------------
 847  */
 848 static void rs_throttle(struct tty_struct * tty)
 849 {
 850         struct serial_state *info = tty->driver_data;
 851         unsigned long flags;
 852 #ifdef SERIAL_DEBUG_THROTTLE
 853         printk("throttle %s ....\n", tty_name(tty));
 854 #endif
 855
 856         if (I_IXOFF(tty))
 857                 rs_send_xchar(tty, STOP_CHAR(tty));
 858
 859         if (C_CRTSCTS(tty))
 860                 info->MCR &= ~SER_RTS;
 861
 862         local_irq_save(flags);
 863         rtsdtr_ctrl(info->MCR);
 864         local_irq_restore(flags);
 865 }
 866
 867 static void rs_unthrottle(struct tty_struct * tty)
 868 {
 869         struct serial_state *info = tty->driver_data;
 870         unsigned long flags;
 871 #ifdef SERIAL_DEBUG_THROTTLE
 872         printk("unthrottle %s ....\n", tty_name(tty));
 873 #endif
 874
 875         if (I_IXOFF(tty)) {
 876                 if (info->x_char)
 877                         info->x_char = 0;
 878                 else
 879                         rs_send_xchar(tty, START_CHAR(tty));
 880         }
 881         if (C_CRTSCTS(tty))
 882                 info->MCR |= SER_RTS;
 883         local_irq_save(flags);
 884         rtsdtr_ctrl(info->MCR);
 885         local_irq_restore(flags);
 886 }
 887
 888 /*
 889  * ------------------------------------------------------------
 890  * rs_ioctl() and friends
 891  * ------------------------------------------------------------
 892  */
 893
 894 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 895 {
 896         struct serial_state *state = tty->driver_data;
 897         unsigned int close_delay, closing_wait;
 898
 899         tty_lock(tty);
 900         close_delay = jiffies_to_msecs(state->tport.close_delay) / 10;
 901         closing_wait = state->tport.closing_wait;
 902         if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
 903                 closing_wait = jiffies_to_msecs(closing_wait) / 10;
 904
 905         ss->line = tty->index;
 906         ss->port = state->port;
 907         ss->flags = state->tport.flags;
 908         ss->xmit_fifo_size = XMIT_FIFO_SIZE;
 909         ss->baud_base = state->baud_base;
 910         ss->close_delay = close_delay;
 911         ss->closing_wait = closing_wait;
 912         ss->custom_divisor = state->custom_divisor;
 913         tty_unlock(tty);
 914         return 0;
 915 }
 916
 917 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 918 {
 919         struct serial_state *state = tty->driver_data;
 920         struct tty_port *port = &state->tport;
 921         bool change_spd;
 922         int                     retval = 0;
 923         unsigned int close_delay, closing_wait;
 924
 925         tty_lock(tty);
 926         change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
 927                 ss->custom_divisor != state->custom_divisor;
 928         if (ss->irq || ss->port != state->port ||
 929                         ss->xmit_fifo_size != XMIT_FIFO_SIZE) {
 930                 tty_unlock(tty);
 931                 return -EINVAL;
 932         }
 933
 934         close_delay = msecs_to_jiffies(ss->close_delay * 10);
 935         closing_wait = ss->closing_wait;
 936         if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
 937                 closing_wait = msecs_to_jiffies(closing_wait * 10);
 938
 939         if (!capable(CAP_SYS_ADMIN)) {
 940                 if ((ss->baud_base != state->baud_base) ||
 941                     (close_delay != port->close_delay) ||
 942                     (closing_wait != port->closing_wait) ||
 943                     ((ss->flags & ~ASYNC_USR_MASK) !=
 944                      (port->flags & ~ASYNC_USR_MASK))) {
 945                         tty_unlock(tty);
 946                         return -EPERM;
 947                 }
 948                 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
 949                                (ss->flags & ASYNC_USR_MASK));
 950                 state->custom_divisor = ss->custom_divisor;
 951                 goto check_and_exit;
 952         }
 953
 954         if (ss->baud_base < 9600) {
 955                 tty_unlock(tty);
 956                 return -EINVAL;
 957         }
 958
 959         /*
 960          * OK, past this point, all the error checking has been done.
 961          * At this point, we start making changes.....
 962          */
 963
 964         state->baud_base = ss->baud_base;
 965         port->flags = ((port->flags & ~ASYNC_FLAGS) |
 966                         (ss->flags & ASYNC_FLAGS));
 967         state->custom_divisor = ss->custom_divisor;
 968         port->close_delay = close_delay;
 969         port->closing_wait = closing_wait;
 970
 971 check_and_exit:
 972         if (tty_port_initialized(port)) {
 973                 if (change_spd) {
 974                         /* warn about deprecation unless clearing */
 975                         if (ss->flags & ASYNC_SPD_MASK)
 976                                 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
 977                         change_speed(tty, state, NULL);
 978                 }
 979         } else
 980                 retval = startup(tty, state);
 981         tty_unlock(tty);
 982         return retval;
 983 }
 984
 985 /*
 986  * get_lsr_info - get line status register info
 987  *
 988  * Purpose: Let user call ioctl() to get info when the UART physically
 989  *          is emptied.  On bus types like RS485, the transmitter must
 990  *          release the bus after transmitting. This must be done when
 991  *          the transmit shift register is empty, not be done when the
 992  *          transmit holding register is empty.  This functionality
 993  *          allows an RS485 driver to be written in user space.
 994  */
 995 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
 996 {
 997         unsigned char status;
 998         unsigned int result;
 999         unsigned long flags;
1000
1001         local_irq_save(flags);
1002         status = amiga_custom.serdatr;
1003         mb();
1004         local_irq_restore(flags);
1005         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1006         if (copy_to_user(value, &result, sizeof(int)))
1007                 return -EFAULT;
1008         return 0;
1009 }
1010
1011
1012 static int rs_tiocmget(struct tty_struct *tty)
1013 {
1014         struct serial_state *info = tty->driver_data;
1015         unsigned char control, status;
1016         unsigned long flags;
1017
1018         if (tty_io_error(tty))
1019                 return -EIO;
1020
1021         control = info->MCR;
1022         local_irq_save(flags);
1023         status = ciab.pra;
1024         local_irq_restore(flags);
1025         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1026                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1027                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1028                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1029                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1030 }
1031
1032 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1033                                                 unsigned int clear)
1034 {
1035         struct serial_state *info = tty->driver_data;
1036         unsigned long flags;
1037
1038         if (tty_io_error(tty))
1039                 return -EIO;
1040
1041         local_irq_save(flags);
1042         if (set & TIOCM_RTS)
1043                 info->MCR |= SER_RTS;
1044         if (set & TIOCM_DTR)
1045                 info->MCR |= SER_DTR;
1046         if (clear & TIOCM_RTS)
1047                 info->MCR &= ~SER_RTS;
1048         if (clear & TIOCM_DTR)
1049                 info->MCR &= ~SER_DTR;
1050         rtsdtr_ctrl(info->MCR);
1051         local_irq_restore(flags);
1052         return 0;
1053 }
1054
1055 /*
1056  * rs_break() --- routine which turns the break handling on or off
1057  */
1058 static int rs_break(struct tty_struct *tty, int break_state)
1059 {
1060         unsigned long flags;
1061
1062         local_irq_save(flags);
1063         if (break_state == -1)
1064           amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK;
1065         else
1066           amiga_custom.adkcon = AC_UARTBRK;
1067         mb();
1068         local_irq_restore(flags);
1069         return 0;
1070 }
1071
1072 /*
1073  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1074  * Return: write counters to the user passed counter struct
1075  * NB: both 1->0 and 0->1 transitions are counted except for
1076  *     RI where only 0->1 is counted.
1077  */
1078 static int rs_get_icount(struct tty_struct *tty,
1079                                 struct serial_icounter_struct *icount)
1080 {
1081         struct serial_state *info = tty->driver_data;
1082         struct async_icount cnow;
1083         unsigned long flags;
1084
1085         local_irq_save(flags);
1086         cnow = info->icount;
1087         local_irq_restore(flags);
1088         icount->cts = cnow.cts;
1089         icount->dsr = cnow.dsr;
1090         icount->rng = cnow.rng;
1091         icount->dcd = cnow.dcd;
1092         icount->rx = cnow.rx;
1093         icount->tx = cnow.tx;
1094         icount->frame = cnow.frame;
1095         icount->overrun = cnow.overrun;
1096         icount->parity = cnow.parity;
1097         icount->brk = cnow.brk;
1098         icount->buf_overrun = cnow.buf_overrun;
1099
1100         return 0;
1101 }
1102
1103 static int rs_ioctl(struct tty_struct *tty,
1104                     unsigned int cmd, unsigned long arg)
1105 {
1106         struct serial_state *info = tty->driver_data;
1107         struct async_icount cprev, cnow;        /* kernel counter temps */
1108         void __user *argp = (void __user *)arg;
1109         unsigned long flags;
1110         DEFINE_WAIT(wait);
1111         int ret;
1112
1113         if ((cmd != TIOCSERCONFIG) &&
1114             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1115                 if (tty_io_error(tty))
1116                     return -EIO;
1117         }
1118
1119         switch (cmd) {
1120                 case TIOCSERCONFIG:
1121                         return 0;
1122
1123                 case TIOCSERGETLSR: /* Get line status register */
1124                         return get_lsr_info(info, argp);
1125
1126                 /*
1127                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1128                  * - mask passed in arg for lines of interest
1129                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1130                  * Caller should use TIOCGICOUNT to see which one it was
1131                  */
1132                 case TIOCMIWAIT:
1133                         local_irq_save(flags);
1134                         /* note the counters on entry */
1135                         cprev = info->icount;
1136                         local_irq_restore(flags);
1137                         while (1) {
1138                                 prepare_to_wait(&info->tport.delta_msr_wait,
1139                                                 &wait, TASK_INTERRUPTIBLE);
1140                                 local_irq_save(flags);
1141                                 cnow = info->icount; /* atomic copy */
1142                                 local_irq_restore(flags);
1143                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1144                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1145                                         ret = -EIO; /* no change => error */
1146                                         break;
1147                                 }
1148                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1149                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1150                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1151                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1152                                         ret = 0;
1153                                         break;
1154                                 }
1155                                 schedule();
1156                                 /* see if a signal did it */
1157                                 if (signal_pending(current)) {
1158                                         ret = -ERESTARTSYS;
1159                                         break;
1160                                 }
1161                                 cprev = cnow;
1162                         }
1163                         finish_wait(&info->tport.delta_msr_wait, &wait);
1164                         return ret;
1165
1166                 default:
1167                         return -ENOIOCTLCMD;
1168                 }
1169         return 0;
1170 }
1171
1172 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1173 {
1174         struct serial_state *info = tty->driver_data;
1175         unsigned long flags;
1176         unsigned int cflag = tty->termios.c_cflag;
1177
1178         change_speed(tty, info, old_termios);
1179
1180         /* Handle transition to B0 status */
1181         if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1182                 info->MCR &= ~(SER_DTR|SER_RTS);
1183                 local_irq_save(flags);
1184                 rtsdtr_ctrl(info->MCR);
1185                 local_irq_restore(flags);
1186         }
1187
1188         /* Handle transition away from B0 status */
1189         if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1190                 info->MCR |= SER_DTR;
1191                 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1192                         info->MCR |= SER_RTS;
1193                 local_irq_save(flags);
1194                 rtsdtr_ctrl(info->MCR);
1195                 local_irq_restore(flags);
1196         }
1197
1198         /* Handle turning off CRTSCTS */
1199         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1200                 tty->hw_stopped = 0;
1201                 rs_start(tty);
1202         }
1203
1204 #if 0
1205         /*
1206          * No need to wake up processes in open wait, since they
1207          * sample the CLOCAL flag once, and don't recheck it.
1208          * XXX  It's not clear whether the current behavior is correct
1209          * or not.  Hence, this may change.....
1210          */
1211         if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1212                 wake_up_interruptible(&info->open_wait);
1213 #endif
1214 }
1215
1216 /*
1217  * ------------------------------------------------------------
1218  * rs_close()
1219  *
1220  * This routine is called when the serial port gets closed.  First, we
1221  * wait for the last remaining data to be sent.  Then, we unlink its
1222  * async structure from the interrupt chain if necessary, and we free
1223  * that IRQ if nothing is left in the chain.
1224  * ------------------------------------------------------------
1225  */
1226 static void rs_close(struct tty_struct *tty, struct file * filp)
1227 {
1228         struct serial_state *state = tty->driver_data;
1229         struct tty_port *port = &state->tport;
1230
1231         if (tty_port_close_start(port, tty, filp) == 0)
1232                 return;
1233
1234         /*
1235          * At this point we stop accepting input.  To do this, we
1236          * disable the receive line status interrupts, and tell the
1237          * interrupt driver to stop checking the data ready bit in the
1238          * line status register.
1239          */
1240         state->read_status_mask &= ~UART_LSR_DR;
1241         if (tty_port_initialized(port)) {
1242                 /* disable receive interrupts */
1243                 amiga_custom.intena = IF_RBF;
1244                 mb();
1245                 /* clear any pending receive interrupt */
1246                 amiga_custom.intreq = IF_RBF;
1247                 mb();
1248
1249                 /*
1250                  * Before we drop DTR, make sure the UART transmitter
1251                  * has completely drained; this is especially
1252                  * important if there is a transmit FIFO!
1253                  */
1254                 rs_wait_until_sent(tty, state->timeout);
1255         }
1256         shutdown(tty, state);
1257         rs_flush_buffer(tty);
1258
1259         tty_ldisc_flush(tty);
1260         port->tty = NULL;
1261
1262         tty_port_close_end(port, tty);
1263 }
1264
1265 /*
1266  * rs_wait_until_sent() --- wait until the transmitter is empty
1267  */
1268 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1269 {
1270         struct serial_state *info = tty->driver_data;
1271         unsigned long orig_jiffies, char_time;
1272         int lsr;
1273
1274         orig_jiffies = jiffies;
1275
1276         /*
1277          * Set the check interval to be 1/5 of the estimated time to
1278          * send a single character, and make it at least 1.  The check
1279          * interval should also be less than the timeout.
1280          *
1281          * Note: we have to use pretty tight timings here to satisfy
1282          * the NIST-PCTS.
1283          */
1284         char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
1285         char_time = char_time / 5;
1286         if (char_time == 0)
1287                 char_time = 1;
1288         if (timeout)
1289           char_time = min_t(unsigned long, char_time, timeout);
1290         /*
1291          * If the transmitter hasn't cleared in twice the approximate
1292          * amount of time to send the entire FIFO, it probably won't
1293          * ever clear.  This assumes the UART isn't doing flow
1294          * control, which is currently the case.  Hence, if it ever
1295          * takes longer than info->timeout, this is probably due to a
1296          * UART bug of some kind.  So, we clamp the timeout parameter at
1297          * 2*info->timeout.
1298          */
1299         if (!timeout || timeout > 2*info->timeout)
1300                 timeout = 2*info->timeout;
1301 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1302         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1303         printk("jiff=%lu...", jiffies);
1304 #endif
1305         while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
1306 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1307                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1308 #endif
1309                 msleep_interruptible(jiffies_to_msecs(char_time));
1310                 if (signal_pending(current))
1311                         break;
1312                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1313                         break;
1314         }
1315         __set_current_state(TASK_RUNNING);
1316
1317 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1318         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1319 #endif
1320 }
1321
1322 /*
1323  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1324  */
1325 static void rs_hangup(struct tty_struct *tty)
1326 {
1327         struct serial_state *info = tty->driver_data;
1328
1329         rs_flush_buffer(tty);
1330         shutdown(tty, info);
1331         info->tport.count = 0;
1332         tty_port_set_active(&info->tport, 0);
1333         info->tport.tty = NULL;
1334         wake_up_interruptible(&info->tport.open_wait);
1335 }
1336
1337 /*
1338  * This routine is called whenever a serial port is opened.  It
1339  * enables interrupts for a serial port, linking in its async structure into
1340  * the IRQ chain.   It also performs the serial-specific
1341  * initialization for the tty structure.
1342  */
1343 static int rs_open(struct tty_struct *tty, struct file * filp)
1344 {
1345         struct tty_port *port = tty->port;
1346         struct serial_state *info = container_of(port, struct serial_state,
1347                         tport);
1348         int retval;
1349
1350         port->count++;
1351         port->tty = tty;
1352         tty->driver_data = info;
1353
1354         retval = startup(tty, info);
1355         if (retval) {
1356                 return retval;
1357         }
1358
1359         return tty_port_block_til_ready(port, tty, filp);
1360 }
1361
1362 /*
1363  * /proc fs routines....
1364  */
1365
1366 static inline void line_info(struct seq_file *m, int line,
1367                 struct serial_state *state)
1368 {
1369         char    stat_buf[30], control, status;
1370         unsigned long flags;
1371
1372         seq_printf(m, "%d: uart:amiga_builtin", line);
1373
1374         local_irq_save(flags);
1375         status = ciab.pra;
1376         control = tty_port_initialized(&state->tport) ? state->MCR : status;
1377         local_irq_restore(flags);
1378
1379         stat_buf[0] = 0;
1380         stat_buf[1] = 0;
1381         if(!(control & SER_RTS))
1382                 strcat(stat_buf, "|RTS");
1383         if(!(status & SER_CTS))
1384                 strcat(stat_buf, "|CTS");
1385         if(!(control & SER_DTR))
1386                 strcat(stat_buf, "|DTR");
1387         if(!(status & SER_DSR))
1388                 strcat(stat_buf, "|DSR");
1389         if(!(status & SER_DCD))
1390                 strcat(stat_buf, "|CD");
1391
1392         if (state->quot)
1393                 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1394
1395         seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1396
1397         if (state->icount.frame)
1398                 seq_printf(m, " fe:%d", state->icount.frame);
1399
1400         if (state->icount.parity)
1401                 seq_printf(m, " pe:%d", state->icount.parity);
1402
1403         if (state->icount.brk)
1404                 seq_printf(m, " brk:%d", state->icount.brk);
1405
1406         if (state->icount.overrun)
1407                 seq_printf(m, " oe:%d", state->icount.overrun);
1408
1409         /*
1410          * Last thing is the RS-232 status lines
1411          */
1412         seq_printf(m, " %s\n", stat_buf+1);
1413 }
1414
1415 static int rs_proc_show(struct seq_file *m, void *v)
1416 {
1417         seq_printf(m, "serinfo:1.0 driver:4.30\n");
1418         line_info(m, 0, &serial_state);
1419         return 0;
1420 }
1421
1422 /*
1423  * ---------------------------------------------------------------------
1424  * rs_init() and friends
1425  *
1426  * rs_init() is called at boot-time to initialize the serial driver.
1427  * ---------------------------------------------------------------------
1428  */
1429
1430 static const struct tty_operations serial_ops = {
1431         .open = rs_open,
1432         .close = rs_close,
1433         .write = rs_write,
1434         .put_char = rs_put_char,
1435         .flush_chars = rs_flush_chars,
1436         .write_room = rs_write_room,
1437         .chars_in_buffer = rs_chars_in_buffer,
1438         .flush_buffer = rs_flush_buffer,
1439         .ioctl = rs_ioctl,
1440         .throttle = rs_throttle,
1441         .unthrottle = rs_unthrottle,
1442         .set_termios = rs_set_termios,
1443         .stop = rs_stop,
1444         .start = rs_start,
1445         .hangup = rs_hangup,
1446         .break_ctl = rs_break,
1447         .send_xchar = rs_send_xchar,
1448         .wait_until_sent = rs_wait_until_sent,
1449         .tiocmget = rs_tiocmget,
1450         .tiocmset = rs_tiocmset,
1451         .get_icount = rs_get_icount,
1452         .set_serial = set_serial_info,
1453         .get_serial = get_serial_info,
1454         .proc_show = rs_proc_show,
1455 };
1456
1457 static int amiga_carrier_raised(struct tty_port *port)
1458 {
1459         return !(ciab.pra & SER_DCD);
1460 }
1461
1462 static void amiga_dtr_rts(struct tty_port *port, int raise)
1463 {
1464         struct serial_state *info = container_of(port, struct serial_state,
1465                         tport);
1466         unsigned long flags;
1467
1468         if (raise)
1469                 info->MCR |= SER_DTR|SER_RTS;
1470         else
1471                 info->MCR &= ~(SER_DTR|SER_RTS);
1472
1473         local_irq_save(flags);
1474         rtsdtr_ctrl(info->MCR);
1475         local_irq_restore(flags);
1476 }
1477
1478 static const struct tty_port_operations amiga_port_ops = {
1479         .carrier_raised = amiga_carrier_raised,
1480         .dtr_rts = amiga_dtr_rts,
1481 };
1482
1483 /*
1484  * The serial driver boot-time initialization code!
1485  */
1486 static int __init amiga_serial_probe(struct platform_device *pdev)
1487 {
1488         struct serial_state *state = &serial_state;
1489         struct tty_driver *driver;
1490         unsigned long flags;
1491         int error;
1492
1493         driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
1494         if (IS_ERR(driver))
1495                 return PTR_ERR(driver);
1496
1497         /* Initialize the tty_driver structure */
1498
1499         driver->driver_name = "amiserial";
1500         driver->name = "ttyS";
1501         driver->major = TTY_MAJOR;
1502         driver->minor_start = 64;
1503         driver->type = TTY_DRIVER_TYPE_SERIAL;
1504         driver->subtype = SERIAL_TYPE_NORMAL;
1505         driver->init_termios = tty_std_termios;
1506         driver->init_termios.c_cflag =
1507                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1508         tty_set_operations(driver, &serial_ops);
1509
1510         memset(state, 0, sizeof(*state));
1511         state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
1512         tty_port_init(&state->tport);
1513         state->tport.ops = &amiga_port_ops;
1514         tty_port_link_device(&state->tport, driver, 0);
1515
1516         error = tty_register_driver(driver);
1517         if (error)
1518                 goto fail_tty_driver_kref_put;
1519
1520         printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1521
1522         /* Hardware set up */
1523
1524         state->baud_base = amiga_colorclock;
1525
1526         /* set ISRs, and then disable the rx interrupts */
1527         error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1528         if (error)
1529                 goto fail_unregister;
1530
1531         error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1532                             "serial RX", state);
1533         if (error)
1534                 goto fail_free_irq;
1535
1536         local_irq_save(flags);
1537
1538         /* turn off Rx and Tx interrupts */
1539         amiga_custom.intena = IF_RBF | IF_TBE;
1540         mb();
1541
1542         /* clear any pending interrupt */
1543         amiga_custom.intreq = IF_RBF | IF_TBE;
1544         mb();
1545
1546         local_irq_restore(flags);
1547
1548         /*
1549          * set the appropriate directions for the modem control flags,
1550          * and clear RTS and DTR
1551          */
1552         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
1553         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
1554
1555         platform_set_drvdata(pdev, state);
1556
1557         serial_driver = driver;
1558
1559         return 0;
1560
1561 fail_free_irq:
1562         free_irq(IRQ_AMIGA_TBE, state);
1563 fail_unregister:
1564         tty_unregister_driver(driver);
1565 fail_tty_driver_kref_put:
1566         tty_port_destroy(&state->tport);
1567         tty_driver_kref_put(driver);
1568         return error;
1569 }
1570
1571 static int __exit amiga_serial_remove(struct platform_device *pdev)
1572 {
1573         struct serial_state *state = platform_get_drvdata(pdev);
1574
1575         tty_unregister_driver(serial_driver);
1576         tty_driver_kref_put(serial_driver);
1577         tty_port_destroy(&state->tport);
1578
1579         free_irq(IRQ_AMIGA_TBE, state);
1580         free_irq(IRQ_AMIGA_RBF, state);
1581
1582         return 0;
1583 }
1584
1585 static struct platform_driver amiga_serial_driver = {
1586         .remove = __exit_p(amiga_serial_remove),
1587         .driver   = {
1588                 .name   = "amiga-serial",
1589         },
1590 };
1591
1592 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1593
1594
1595 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1596
1597 /*
1598  * ------------------------------------------------------------
1599  * Serial console driver
1600  * ------------------------------------------------------------
1601  */
1602
1603 static void amiga_serial_putc(char c)
1604 {
1605         amiga_custom.serdat = (unsigned char)c | 0x100;
1606         while (!(amiga_custom.serdatr & 0x2000))
1607                 barrier();
1608 }
1609
1610 /*
1611  *      Print a string to the serial port trying not to disturb
1612  *      any possible real use of the port...
1613  *
1614  *      The console must be locked when we get here.
1615  */
1616 static void serial_console_write(struct console *co, const char *s,
1617                                 unsigned count)
1618 {
1619         unsigned short intena = amiga_custom.intenar;
1620
1621         amiga_custom.intena = IF_TBE;
1622
1623         while (count--) {
1624                 if (*s == '\n')
1625                         amiga_serial_putc('\r');
1626                 amiga_serial_putc(*s++);
1627         }
1628
1629         amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1630 }
1631
1632 static struct tty_driver *serial_console_device(struct console *c, int *index)
1633 {
1634         *index = 0;
1635         return serial_driver;
1636 }
1637
1638 static struct console sercons = {
1639         .name =         "ttyS",
1640         .write =        serial_console_write,
1641         .device =       serial_console_device,
1642         .flags =        CON_PRINTBUFFER,
1643         .index =        -1,
1644 };
1645
1646 /*
1647  *      Register console.
1648  */
1649 static int __init amiserial_console_init(void)
1650 {
1651         if (!MACH_IS_AMIGA)
1652                 return -ENODEV;
1653
1654         register_console(&sercons);
1655         return 0;
1656 }
1657 console_initcall(amiserial_console_init);
1658
1659 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1660
1661 MODULE_LICENSE("GPL");
1662 MODULE_ALIAS("platform:amiga-serial");