drivers/serial/dz.c

   1 /*
   2  * dz.c: Serial port driver for DECStations equiped
   3  *       with the DZ chipset.
   4  *
   5  * Copyright (C) 1998 Olivier A. D. Lebaillif
   6  *
   7  * Email: olivier.lebaillif@ifrsys.com
   8  *
   9  * [31-AUG-98] triemer
  10  * Changed IRQ to use Harald's dec internals interrupts.h
  11  * removed base_addr code - moving address assignment to setup.c
  12  * Changed name of dz_init to rs_init to be consistent with tc code
  13  * [13-NOV-98] triemer fixed code to receive characters
  14  *    after patches by harald to irq code.
  15  * [09-JAN-99] triemer minor fix for schedule - due to removal of timeout
  16  *            field from "current" - somewhere between 2.1.121 and 2.1.131
  17  Qua Jun 27 15:02:26 BRT 2001
  18  * [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups
  19  *
  20  * Parts (C) 1999 David Airlie, airlied@linux.ie
  21  * [07-SEP-99] Bugfixes
  22  *
  23  * [06-Jan-2002] Russell King <rmk@arm.linux.org.uk>
  24  * Converted to new serial core
  25  */
  26
  27 #undef DEBUG_DZ
  28
  29 #include <linux/config.h>
  30 #include <linux/module.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/init.h>
  33 #include <linux/console.h>
  34 #include <linux/tty.h>
  35 #include <linux/tty_flip.h>
  36 #include <linux/serial_core.h>
  37 #include <linux/serial.h>
  38
  39 #include <asm/bootinfo.h>
  40 #include <asm/dec/interrupts.h>
  41 #include <asm/dec/kn01.h>
  42 #include <asm/dec/kn02.h>
  43 #include <asm/dec/machtype.h>
  44 #include <asm/dec/prom.h>
  45 #include <asm/irq.h>
  46 #include <asm/system.h>
  47 #include <asm/uaccess.h>
  48
  49 #define CONSOLE_LINE (3)        /* for definition of struct console */
  50
  51 #include "dz.h"
  52
  53 #define DZ_INTR_DEBUG 1
  54
  55 static char *dz_name = "DECstation DZ serial driver version ";
  56 static char *dz_version = "1.02";
  57
  58 struct dz_port {
  59         struct uart_port        port;
  60         unsigned int            cflag;
  61 };
  62
  63 static struct dz_port dz_ports[DZ_NB_PORT];
  64
  65 #ifdef DEBUG_DZ
  66 /*
  67  * debugging code to send out chars via prom
  68  */
  69 static void debug_console(const char *s, int count)
  70 {
  71         unsigned i;
  72
  73         for (i = 0; i < count; i++) {
  74                 if (*s == 10)
  75                         prom_printf("%c", 13);
  76                 prom_printf("%c", *s++);
  77         }
  78 }
  79 #endif
  80
  81 /*
  82  * ------------------------------------------------------------
  83  * dz_in () and dz_out ()
  84  *
  85  * These routines are used to access the registers of the DZ
  86  * chip, hiding relocation differences between implementation.
  87  * ------------------------------------------------------------
  88  */
  89
  90 static inline unsigned short dz_in(struct dz_port *dport, unsigned offset)
  91 {
  92         volatile unsigned short *addr =
  93                 (volatile unsigned short *) (dport->port.membase + offset);
  94         return *addr;
  95 }
  96
  97 static inline void dz_out(struct dz_port *dport, unsigned offset,
  98                           unsigned short value)
  99 {
 100         volatile unsigned short *addr =
 101                 (volatile unsigned short *) (dport->port.membase + offset);
 102         *addr = value;
 103 }
 104
 105 /*
 106  * ------------------------------------------------------------
 107  * rs_stop () and rs_start ()
 108  *
 109  * These routines are called before setting or resetting
 110  * tty->stopped. They enable or disable transmitter interrupts,
 111  * as necessary.
 112  * ------------------------------------------------------------
 113  */
 114
 115 static void dz_stop_tx(struct uart_port *uport)
 116 {
 117         struct dz_port *dport = (struct dz_port *)uport;
 118         unsigned short tmp, mask = 1 << dport->port.line;
 119         unsigned long flags;
 120
 121         spin_lock_irqsave(&dport->port.lock, flags);
 122         tmp = dz_in(dport, DZ_TCR);     /* read the TX flag */
 123         tmp &= ~mask;                   /* clear the TX flag */
 124         dz_out(dport, DZ_TCR, tmp);
 125         spin_unlock_irqrestore(&dport->port.lock, flags);
 126 }
 127
 128 static void dz_start_tx(struct uart_port *uport)
 129 {
 130         struct dz_port *dport = (struct dz_port *)uport;
 131         unsigned short tmp, mask = 1 << dport->port.line;
 132         unsigned long flags;
 133
 134         spin_lock_irqsave(&dport->port.lock, flags);
 135         tmp = dz_in(dport, DZ_TCR);     /* read the TX flag */
 136         tmp |= mask;                    /* set the TX flag */
 137         dz_out(dport, DZ_TCR, tmp);
 138         spin_unlock_irqrestore(&dport->port.lock, flags);
 139 }
 140
 141 static void dz_stop_rx(struct uart_port *uport)
 142 {
 143         struct dz_port *dport = (struct dz_port *)uport;
 144         unsigned long flags;
 145
 146         spin_lock_irqsave(&dport->port.lock, flags);
 147         dport->cflag &= ~DZ_CREAD;
 148         dz_out(dport, DZ_LPR, dport->cflag);
 149         spin_unlock_irqrestore(&dport->port.lock, flags);
 150 }
 151
 152 static void dz_enable_ms(struct uart_port *port)
 153 {
 154         /* nothing to do */
 155 }
 156
 157 /*
 158  * ------------------------------------------------------------
 159  * Here starts the interrupt handling routines.  All of the
 160  * following subroutines are declared as inline and are folded
 161  * into dz_interrupt.  They were separated out for readability's
 162  * sake.
 163  *
 164  * Note: rs_interrupt() is a "fast" interrupt, which means that it
 165  * runs with interrupts turned off.  People who may want to modify
 166  * rs_interrupt() should try to keep the interrupt handler as fast as
 167  * possible.  After you are done making modifications, it is not a bad
 168  * idea to do:
 169  *
 170  *      make drivers/serial/dz.s
 171  *
 172  * and look at the resulting assemble code in dz.s.
 173  *
 174  * ------------------------------------------------------------
 175  */
 176
 177 /*
 178  * ------------------------------------------------------------
 179  * receive_char ()
 180  *
 181  * This routine deals with inputs from any lines.
 182  * ------------------------------------------------------------
 183  */
 184 static inline void dz_receive_chars(struct dz_port *dport)
 185 {
 186         struct tty_struct *tty = NULL;
 187         struct uart_icount *icount;
 188         int ignore = 0;
 189         unsigned short status, tmp;
 190         unsigned char ch, flag;
 191
 192         /* this code is going to be a problem...
 193            the call to tty_flip_buffer is going to need
 194            to be rethought...
 195          */
 196         do {
 197                 status = dz_in(dport, DZ_RBUF);
 198
 199                 /* punt so we don't get duplicate characters */
 200                 if (!(status & DZ_DVAL))
 201                         goto ignore_char;
 202
 203
 204                 ch = UCHAR(status);     /* grab the char */
 205                 flag = TTY_NORMAL;
 206
 207 #if 0
 208                 if (info->is_console) {
 209                         if (ch == 0)
 210                                 return;         /* it's a break ... */
 211                 }
 212 #endif
 213
 214                 tty = dport->port.info->tty;/* now tty points to the proper dev */
 215                 icount = &dport->port.icount;
 216
 217                 if (!tty)
 218                         break;
 219
 220                 icount->rx++;
 221
 222                 /* keep track of the statistics */
 223                 if (status & (DZ_OERR | DZ_FERR | DZ_PERR)) {
 224                         if (status & DZ_PERR)   /* parity error */
 225                                 icount->parity++;
 226                         else if (status & DZ_FERR)      /* frame error */
 227                                 icount->frame++;
 228                         if (status & DZ_OERR)   /* overrun error */
 229                                 icount->overrun++;
 230
 231                         /*  check to see if we should ignore the character
 232                            and mask off conditions that should be ignored
 233                          */
 234
 235                         if (status & dport->port.ignore_status_mask) {
 236                                 if (++ignore > 100)
 237                                         break;
 238                                 goto ignore_char;
 239                         }
 240                         /* mask off the error conditions we want to ignore */
 241                         tmp = status & dport->port.read_status_mask;
 242
 243                         if (tmp & DZ_PERR) {
 244                                 flag = TTY_PARITY;
 245 #ifdef DEBUG_DZ
 246                                 debug_console("PERR\n", 5);
 247 #endif
 248                         } else if (tmp & DZ_FERR) {
 249                                 flag = TTY_FRAME;
 250 #ifdef DEBUG_DZ
 251                                 debug_console("FERR\n", 5);
 252 #endif
 253                         }
 254                         if (tmp & DZ_OERR) {
 255 #ifdef DEBUG_DZ
 256                                 debug_console("OERR\n", 5);
 257 #endif
 258                                 tty_insert_flip_char(tty, ch, flag);
 259                                 ch = 0;
 260                                 flag = TTY_OVERRUN;
 261                         }
 262                 }
 263                 tty_insert_flip_char(tty, ch, flag);
 264               ignore_char:
 265                         ;
 266         } while (status & DZ_DVAL);
 267
 268         if (tty)
 269                 tty_flip_buffer_push(tty);
 270 }
 271
 272 /*
 273  * ------------------------------------------------------------
 274  * transmit_char ()
 275  *
 276  * This routine deals with outputs to any lines.
 277  * ------------------------------------------------------------
 278  */
 279 static inline void dz_transmit_chars(struct dz_port *dport)
 280 {
 281         struct circ_buf *xmit = &dport->port.info->xmit;
 282         unsigned char tmp;
 283
 284         if (dport->port.x_char) {       /* XON/XOFF chars */
 285                 dz_out(dport, DZ_TDR, dport->port.x_char);
 286                 dport->port.icount.tx++;
 287                 dport->port.x_char = 0;
 288                 return;
 289         }
 290         /* if nothing to do or stopped or hardware stopped */
 291         if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
 292                 dz_stop_tx(&dport->port);
 293                 return;
 294         }
 295
 296         /*
 297          * if something to do ... (rember the dz has no output fifo so we go
 298          * one char at a time :-<
 299          */
 300         tmp = xmit->buf[xmit->tail];
 301         xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
 302         dz_out(dport, DZ_TDR, tmp);
 303         dport->port.icount.tx++;
 304
 305         if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
 306                 uart_write_wakeup(&dport->port);
 307
 308         /* Are we done */
 309         if (uart_circ_empty(xmit))
 310                 dz_stop_tx(&dport->port);
 311 }
 312
 313 /*
 314  * ------------------------------------------------------------
 315  * check_modem_status ()
 316  *
 317  * Only valid for the MODEM line duh !
 318  * ------------------------------------------------------------
 319  */
 320 static inline void check_modem_status(struct dz_port *dport)
 321 {
 322         unsigned short status;
 323
 324         /* if not ne modem line just return */
 325         if (dport->port.line != DZ_MODEM)
 326                 return;
 327
 328         status = dz_in(dport, DZ_MSR);
 329
 330         /* it's easy, since DSR2 is the only bit in the register */
 331         if (status)
 332                 dport->port.icount.dsr++;
 333 }
 334
 335 /*
 336  * ------------------------------------------------------------
 337  * dz_interrupt ()
 338  *
 339  * this is the main interrupt routine for the DZ chip.
 340  * It deals with the multiple ports.
 341  * ------------------------------------------------------------
 342  */
 343 static irqreturn_t dz_interrupt(int irq, void *dev, struct pt_regs *regs)
 344 {
 345         struct dz_port *dport;
 346         unsigned short status;
 347
 348         /* get the reason why we just got an irq */
 349         status = dz_in((struct dz_port *)dev, DZ_CSR);
 350         dport = &dz_ports[LINE(status)];
 351
 352         if (status & DZ_RDONE)
 353                 dz_receive_chars(dport);
 354
 355         if (status & DZ_TRDY)
 356                 dz_transmit_chars(dport);
 357
 358         /* FIXME: what about check modem status??? --rmk */
 359
 360         return IRQ_HANDLED;
 361 }
 362
 363 /*
 364  * -------------------------------------------------------------------
 365  * Here ends the DZ interrupt routines.
 366  * -------------------------------------------------------------------
 367  */
 368
 369 static unsigned int dz_get_mctrl(struct uart_port *uport)
 370 {
 371         struct dz_port *dport = (struct dz_port *)uport;
 372         unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
 373
 374         if (dport->port.line == DZ_MODEM) {
 375                 /*
 376                  * CHECKME: This is a guess from the other code... --rmk
 377                  */
 378                 if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR)
 379                         mctrl &= ~TIOCM_DSR;
 380         }
 381
 382         return mctrl;
 383 }
 384
 385 static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
 386 {
 387         struct dz_port *dport = (struct dz_port *)uport;
 388         unsigned short tmp;
 389
 390         if (dport->port.line == DZ_MODEM) {
 391                 tmp = dz_in(dport, DZ_TCR);
 392                 if (mctrl & TIOCM_DTR)
 393                         tmp &= ~DZ_MODEM_DTR;
 394                 else
 395                         tmp |= DZ_MODEM_DTR;
 396                 dz_out(dport, DZ_TCR, tmp);
 397         }
 398 }
 399
 400 /*
 401  * -------------------------------------------------------------------
 402  * startup ()
 403  *
 404  * various initialization tasks
 405  * -------------------------------------------------------------------
 406  */
 407 static int dz_startup(struct uart_port *uport)
 408 {
 409         struct dz_port *dport = (struct dz_port *)uport;
 410         unsigned long flags;
 411         unsigned short tmp;
 412
 413         /* The dz lines for the mouse/keyboard must be
 414          * opened using their respective drivers.
 415          */
 416         if ((dport->port.line == DZ_KEYBOARD) ||
 417             (dport->port.line == DZ_MOUSE))
 418                 return -ENODEV;
 419
 420         spin_lock_irqsave(&dport->port.lock, flags);
 421
 422         /* enable the interrupt and the scanning */
 423         tmp = dz_in(dport, DZ_CSR);
 424         tmp |= DZ_RIE | DZ_TIE | DZ_MSE;
 425         dz_out(dport, DZ_CSR, tmp);
 426
 427         spin_unlock_irqrestore(&dport->port.lock, flags);
 428
 429         return 0;
 430 }
 431
 432 /*
 433  * -------------------------------------------------------------------
 434  * shutdown ()
 435  *
 436  * This routine will shutdown a serial port; interrupts are disabled, and
 437  * DTR is dropped if the hangup on close termio flag is on.
 438  * -------------------------------------------------------------------
 439  */
 440 static void dz_shutdown(struct uart_port *uport)
 441 {
 442         dz_stop_tx(uport);
 443 }
 444
 445 /*
 446  * get_lsr_info - get line status register info
 447  *
 448  * Purpose: Let user call ioctl() to get info when the UART physically
 449  *          is emptied.  On bus types like RS485, the transmitter must
 450  *          release the bus after transmitting. This must be done when
 451  *          the transmit shift register is empty, not be done when the
 452  *          transmit holding register is empty.  This functionality
 453  *          allows an RS485 driver to be written in user space.
 454  */
 455 static unsigned int dz_tx_empty(struct uart_port *uport)
 456 {
 457         struct dz_port *dport = (struct dz_port *)uport;
 458         unsigned short status = dz_in(dport, DZ_LPR);
 459
 460         /* FIXME: this appears to be obviously broken --rmk. */
 461         return status ? TIOCSER_TEMT : 0;
 462 }
 463
 464 static void dz_break_ctl(struct uart_port *uport, int break_state)
 465 {
 466         struct dz_port *dport = (struct dz_port *)uport;
 467         unsigned long flags;
 468         unsigned short tmp, mask = 1 << uport->line;
 469
 470         spin_lock_irqsave(&uport->lock, flags);
 471         tmp = dz_in(dport, DZ_TCR);
 472         if (break_state)
 473                 tmp |= mask;
 474         else
 475                 tmp &= ~mask;
 476         dz_out(dport, DZ_TCR, tmp);
 477         spin_unlock_irqrestore(&uport->lock, flags);
 478 }
 479
 480 static void dz_set_termios(struct uart_port *uport, struct termios *termios,
 481                            struct termios *old_termios)
 482 {
 483         struct dz_port *dport = (struct dz_port *)uport;
 484         unsigned long flags;
 485         unsigned int cflag, baud;
 486
 487         cflag = dport->port.line;
 488
 489         switch (termios->c_cflag & CSIZE) {
 490         case CS5:
 491                 cflag |= DZ_CS5;
 492                 break;
 493         case CS6:
 494                 cflag |= DZ_CS6;
 495                 break;
 496         case CS7:
 497                 cflag |= DZ_CS7;
 498                 break;
 499         case CS8:
 500         default:
 501                 cflag |= DZ_CS8;
 502         }
 503
 504         if (termios->c_cflag & CSTOPB)
 505                 cflag |= DZ_CSTOPB;
 506         if (termios->c_cflag & PARENB)
 507                 cflag |= DZ_PARENB;
 508         if (termios->c_cflag & PARODD)
 509                 cflag |= DZ_PARODD;
 510
 511         baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600);
 512         switch (baud) {
 513         case 50:
 514                 cflag |= DZ_B50;
 515                 break;
 516         case 75:
 517                 cflag |= DZ_B75;
 518                 break;
 519         case 110:
 520                 cflag |= DZ_B110;
 521                 break;
 522         case 134:
 523                 cflag |= DZ_B134;
 524                 break;
 525         case 150:
 526                 cflag |= DZ_B150;
 527                 break;
 528         case 300:
 529                 cflag |= DZ_B300;
 530                 break;
 531         case 600:
 532                 cflag |= DZ_B600;
 533                 break;
 534         case 1200:
 535                 cflag |= DZ_B1200;
 536                 break;
 537         case 1800:
 538                 cflag |= DZ_B1800;
 539                 break;
 540         case 2000:
 541                 cflag |= DZ_B2000;
 542                 break;
 543         case 2400:
 544                 cflag |= DZ_B2400;
 545                 break;
 546         case 3600:
 547                 cflag |= DZ_B3600;
 548                 break;
 549         case 4800:
 550                 cflag |= DZ_B4800;
 551                 break;
 552         case 7200:
 553                 cflag |= DZ_B7200;
 554                 break;
 555         case 9600:
 556         default:
 557                 cflag |= DZ_B9600;
 558         }
 559
 560         if (termios->c_cflag & CREAD)
 561                 cflag |= DZ_RXENAB;
 562
 563         spin_lock_irqsave(&dport->port.lock, flags);
 564
 565         dz_out(dport, DZ_LPR, cflag);
 566         dport->cflag = cflag;
 567
 568         /* setup accept flag */
 569         dport->port.read_status_mask = DZ_OERR;
 570         if (termios->c_iflag & INPCK)
 571                 dport->port.read_status_mask |= DZ_FERR | DZ_PERR;
 572
 573         /* characters to ignore */
 574         uport->ignore_status_mask = 0;
 575         if (termios->c_iflag & IGNPAR)
 576                 dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;
 577
 578         spin_unlock_irqrestore(&dport->port.lock, flags);
 579 }
 580
 581 static const char *dz_type(struct uart_port *port)
 582 {
 583         return "DZ";
 584 }
 585
 586 static void dz_release_port(struct uart_port *port)
 587 {
 588         /* nothing to do */
 589 }
 590
 591 static int dz_request_port(struct uart_port *port)
 592 {
 593         return 0;
 594 }
 595
 596 static void dz_config_port(struct uart_port *port, int flags)
 597 {
 598         if (flags & UART_CONFIG_TYPE)
 599                 port->type = PORT_DZ;
 600 }
 601
 602 /*
 603  * verify the new serial_struct (for TIOCSSERIAL).
 604  */
 605 static int dz_verify_port(struct uart_port *port, struct serial_struct *ser)
 606 {
 607         int ret = 0;
 608         if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
 609                 ret = -EINVAL;
 610         if (ser->irq != port->irq)
 611                 ret = -EINVAL;
 612         return ret;
 613 }
 614
 615 static struct uart_ops dz_ops = {
 616         .tx_empty       = dz_tx_empty,
 617         .get_mctrl      = dz_get_mctrl,
 618         .set_mctrl      = dz_set_mctrl,
 619         .stop_tx        = dz_stop_tx,
 620         .start_tx       = dz_start_tx,
 621         .stop_rx        = dz_stop_rx,
 622         .enable_ms      = dz_enable_ms,
 623         .break_ctl      = dz_break_ctl,
 624         .startup        = dz_startup,
 625         .shutdown       = dz_shutdown,
 626         .set_termios    = dz_set_termios,
 627         .type           = dz_type,
 628         .release_port   = dz_release_port,
 629         .request_port   = dz_request_port,
 630         .config_port    = dz_config_port,
 631         .verify_port    = dz_verify_port,
 632 };
 633
 634 static void __init dz_init_ports(void)
 635 {
 636         static int first = 1;
 637         struct dz_port *dport;
 638         unsigned long base;
 639         int i;
 640
 641         if (!first)
 642                 return;
 643         first = 0;
 644
 645         if (mips_machtype == MACH_DS23100 ||
 646             mips_machtype == MACH_DS5100)
 647                 base = CKSEG1ADDR(KN01_SLOT_BASE + KN01_DZ11);
 648         else
 649                 base = CKSEG1ADDR(KN02_SLOT_BASE + KN02_DZ11);
 650
 651         for (i = 0, dport = dz_ports; i < DZ_NB_PORT; i++, dport++) {
 652                 spin_lock_init(&dport->port.lock);
 653                 dport->port.membase     = (char *) base;
 654                 dport->port.iotype      = UPIO_PORT;
 655                 dport->port.irq         = dec_interrupt[DEC_IRQ_DZ11];
 656                 dport->port.line        = i;
 657                 dport->port.fifosize    = 1;
 658                 dport->port.ops         = &dz_ops;
 659                 dport->port.flags       = UPF_BOOT_AUTOCONF;
 660         }
 661 }
 662
 663 static void dz_reset(struct dz_port *dport)
 664 {
 665         dz_out(dport, DZ_CSR, DZ_CLR);
 666
 667         while (dz_in(dport, DZ_CSR) & DZ_CLR);
 668                 /* FIXME: cpu_relax? */
 669
 670         iob();
 671
 672         /* enable scanning */
 673         dz_out(dport, DZ_CSR, DZ_MSE);
 674 }
 675
 676 #ifdef CONFIG_SERIAL_DZ_CONSOLE
 677 static void dz_console_putchar(struct uart_port *port, int ch)
 678 {
 679         struct dz_port *dport = (struct dz_port *)uport;
 680         unsigned long flags;
 681         int loops = 2500;
 682         unsigned short tmp = (unsigned char)ch;
 683         /* this code sends stuff out to serial device - spinning its
 684            wheels and waiting. */
 685
 686         spin_lock_irqsave(&dport->port.lock, flags);
 687
 688         /* spin our wheels */
 689         while (((dz_in(dport, DZ_CSR) & DZ_TRDY) != DZ_TRDY) && loops--)
 690                 /* FIXME: cpu_relax, udelay? --rmk */
 691                 ;
 692
 693         /* Actually transmit the character. */
 694         dz_out(dport, DZ_TDR, tmp);
 695
 696         spin_unlock_irqrestore(&dport->port.lock, flags);
 697 }
 698
 699 /*
 700  * -------------------------------------------------------------------
 701  * dz_console_print ()
 702  *
 703  * dz_console_print is registered for printk.
 704  * The console must be locked when we get here.
 705  * -------------------------------------------------------------------
 706  */
 707 static void dz_console_print(struct console *cons,
 708                              const char *str,
 709                              unsigned int count)
 710 {
 711         struct dz_port *dport = &dz_ports[CONSOLE_LINE];
 712 #ifdef DEBUG_DZ
 713         prom_printf((char *) str);
 714 #endif
 715         uart_console_write(&dport->port, str, count, dz_console_putchar);
 716 }
 717
 718 static int __init dz_console_setup(struct console *co, char *options)
 719 {
 720         struct dz_port *dport = &dz_ports[CONSOLE_LINE];
 721         int baud = 9600;
 722         int bits = 8;
 723         int parity = 'n';
 724         int flow = 'n';
 725         int ret;
 726         unsigned short mask, tmp;
 727
 728         if (options)
 729                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 730
 731         dz_reset(dport);
 732
 733         ret = uart_set_options(&dport->port, co, baud, parity, bits, flow);
 734         if (ret == 0) {
 735                 mask = 1 << dport->port.line;
 736                 tmp = dz_in(dport, DZ_TCR);     /* read the TX flag */
 737                 if (!(tmp & mask)) {
 738                         tmp |= mask;            /* set the TX flag */
 739                         dz_out(dport, DZ_TCR, tmp);
 740                 }
 741         }
 742
 743         return ret;
 744 }
 745
 746 static struct console dz_sercons =
 747 {
 748         .name   = "ttyS",
 749         .write  = dz_console_print,
 750         .device = uart_console_device,
 751         .setup  = dz_console_setup,
 752         .flags  = CON_CONSDEV | CON_PRINTBUFFER,
 753         .index  = CONSOLE_LINE,
 754 };
 755
 756 void __init dz_serial_console_init(void)
 757 {
 758         dz_init_ports();
 759
 760         register_console(&dz_sercons);
 761 }
 762
 763 #define SERIAL_DZ_CONSOLE       &dz_sercons
 764 #else
 765 #define SERIAL_DZ_CONSOLE       NULL
 766 #endif /* CONFIG_SERIAL_DZ_CONSOLE */
 767
 768 static struct uart_driver dz_reg = {
 769         .owner                  = THIS_MODULE,
 770         .driver_name            = "serial",
 771 #ifdef CONFIG_DEVFS
 772         .dev_name               = "tts/%d",
 773 #else
 774         .dev_name               = "ttyS%d",
 775 #endif
 776         .major                  = TTY_MAJOR,
 777         .minor                  = 64,
 778         .nr                     = DZ_NB_PORT,
 779         .cons                   = SERIAL_DZ_CONSOLE,
 780 };
 781
 782 int __init dz_init(void)
 783 {
 784         unsigned long flags;
 785         int ret, i;
 786
 787         printk("%s%s\n", dz_name, dz_version);
 788
 789         dz_init_ports();
 790
 791         save_flags(flags);
 792         cli();
 793
 794 #ifndef CONFIG_SERIAL_DZ_CONSOLE
 795         /* reset the chip */
 796         dz_reset(&dz_ports[0]);
 797 #endif
 798
 799         /* order matters here... the trick is that flags
 800            is updated... in request_irq - to immediatedly obliterate
 801            it is unwise. */
 802         restore_flags(flags);
 803
 804         if (request_irq(dz_ports[0].port.irq, dz_interrupt,
 805                         SA_INTERRUPT, "DZ", &dz_ports[0]))
 806                 panic("Unable to register DZ interrupt");
 807
 808         ret = uart_register_driver(&dz_reg);
 809         if (ret != 0)
 810                 return ret;
 811
 812         for (i = 0; i < DZ_NB_PORT; i++)
 813                 uart_add_one_port(&dz_reg, &dz_ports[i].port);
 814
 815         return ret;
 816 }
 817
 818 MODULE_DESCRIPTION("DECstation DZ serial driver");
 819 MODULE_LICENSE("GPL");