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                 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
 220                         break;
 221
 222                 icount->rx++;
 223
 224                 /* keep track of the statistics */
 225                 if (status & (DZ_OERR | DZ_FERR | DZ_PERR)) {
 226                         if (status & DZ_PERR)   /* parity error */
 227                                 icount->parity++;
 228                         else if (status & DZ_FERR)      /* frame error */
 229                                 icount->frame++;
 230                         if (status & DZ_OERR)   /* overrun error */
 231                                 icount->overrun++;
 232
 233                         /*  check to see if we should ignore the character
 234                            and mask off conditions that should be ignored
 235                          */
 236
 237                         if (status & dport->port.ignore_status_mask) {
 238                                 if (++ignore > 100)
 239                                         break;
 240                                 goto ignore_char;
 241                         }
 242                         /* mask off the error conditions we want to ignore */
 243                         tmp = status & dport->port.read_status_mask;
 244
 245                         if (tmp & DZ_PERR) {
 246                                 flag = TTY_PARITY;
 247 #ifdef DEBUG_DZ
 248                                 debug_console("PERR\n", 5);
 249 #endif
 250                         } else if (tmp & DZ_FERR) {
 251                                 flag = TTY_FRAME;
 252 #ifdef DEBUG_DZ
 253                                 debug_console("FERR\n", 5);
 254 #endif
 255                         }
 256                         if (tmp & DZ_OERR) {
 257 #ifdef DEBUG_DZ
 258                                 debug_console("OERR\n", 5);
 259 #endif
 260                                 tty_insert_flip_char(tty, ch, flag);
 261                                 ch = 0;
 262                                 flag = TTY_OVERRUN;
 263                         }
 264                 }
 265                 tty_insert_flip_char(tty, ch, flag);
 266               ignore_char:
 267         } while (status & DZ_DVAL);
 268
 269         if (tty)
 270                 tty_flip_buffer_push(tty);
 271 }
 272
 273 /*
 274  * ------------------------------------------------------------
 275  * transmit_char ()
 276  *
 277  * This routine deals with outputs to any lines.
 278  * ------------------------------------------------------------
 279  */
 280 static inline void dz_transmit_chars(struct dz_port *dport)
 281 {
 282         struct circ_buf *xmit = &dport->port.info->xmit;
 283         unsigned char tmp;
 284
 285         if (dport->port.x_char) {       /* XON/XOFF chars */
 286                 dz_out(dport, DZ_TDR, dport->port.x_char);
 287                 dport->port.icount.tx++;
 288                 dport->port.x_char = 0;
 289                 return;
 290         }
 291         /* if nothing to do or stopped or hardware stopped */
 292         if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
 293                 dz_stop_tx(&dport->port);
 294                 return;
 295         }
 296
 297         /*
 298          * if something to do ... (rember the dz has no output fifo so we go
 299          * one char at a time :-<
 300          */
 301         tmp = xmit->buf[xmit->tail];
 302         xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
 303         dz_out(dport, DZ_TDR, tmp);
 304         dport->port.icount.tx++;
 305
 306         if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
 307                 uart_write_wakeup(&dport->port);
 308
 309         /* Are we done */
 310         if (uart_circ_empty(xmit))
 311                 dz_stop_tx(&dport->port);
 312 }
 313
 314 /*
 315  * ------------------------------------------------------------
 316  * check_modem_status ()
 317  *
 318  * Only valid for the MODEM line duh !
 319  * ------------------------------------------------------------
 320  */
 321 static inline void check_modem_status(struct dz_port *dport)
 322 {
 323         unsigned short status;
 324
 325         /* if not ne modem line just return */
 326         if (dport->port.line != DZ_MODEM)
 327                 return;
 328
 329         status = dz_in(dport, DZ_MSR);
 330
 331         /* it's easy, since DSR2 is the only bit in the register */
 332         if (status)
 333                 dport->port.icount.dsr++;
 334 }
 335
 336 /*
 337  * ------------------------------------------------------------
 338  * dz_interrupt ()
 339  *
 340  * this is the main interrupt routine for the DZ chip.
 341  * It deals with the multiple ports.
 342  * ------------------------------------------------------------
 343  */
 344 static irqreturn_t dz_interrupt(int irq, void *dev, struct pt_regs *regs)
 345 {
 346         struct dz_port *dport;
 347         unsigned short status;
 348
 349         /* get the reason why we just got an irq */
 350         status = dz_in((struct dz_port *)dev, DZ_CSR);
 351         dport = &dz_ports[LINE(status)];
 352
 353         if (status & DZ_RDONE)
 354                 dz_receive_chars(dport);
 355
 356         if (status & DZ_TRDY)
 357                 dz_transmit_chars(dport);
 358
 359         /* FIXME: what about check modem status??? --rmk */
 360
 361         return IRQ_HANDLED;
 362 }
 363
 364 /*
 365  * -------------------------------------------------------------------
 366  * Here ends the DZ interrupt routines.
 367  * -------------------------------------------------------------------
 368  */
 369
 370 static unsigned int dz_get_mctrl(struct uart_port *uport)
 371 {
 372         struct dz_port *dport = (struct dz_port *)uport;
 373         unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
 374
 375         if (dport->port.line == DZ_MODEM) {
 376                 /*
 377                  * CHECKME: This is a guess from the other code... --rmk
 378                  */
 379                 if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR)
 380                         mctrl &= ~TIOCM_DSR;
 381         }
 382
 383         return mctrl;
 384 }
 385
 386 static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
 387 {
 388         struct dz_port *dport = (struct dz_port *)uport;
 389         unsigned short tmp;
 390
 391         if (dport->port.line == DZ_MODEM) {
 392                 tmp = dz_in(dport, DZ_TCR);
 393                 if (mctrl & TIOCM_DTR)
 394                         tmp &= ~DZ_MODEM_DTR;
 395                 else
 396                         tmp |= DZ_MODEM_DTR;
 397                 dz_out(dport, DZ_TCR, tmp);
 398         }
 399 }
 400
 401 /*
 402  * -------------------------------------------------------------------
 403  * startup ()
 404  *
 405  * various initialization tasks
 406  * -------------------------------------------------------------------
 407  */
 408 static int dz_startup(struct uart_port *uport)
 409 {
 410         struct dz_port *dport = (struct dz_port *)uport;
 411         unsigned long flags;
 412         unsigned short tmp;
 413
 414         /* The dz lines for the mouse/keyboard must be
 415          * opened using their respective drivers.
 416          */
 417         if ((dport->port.line == DZ_KEYBOARD) ||
 418             (dport->port.line == DZ_MOUSE))
 419                 return -ENODEV;
 420
 421         spin_lock_irqsave(&dport->port.lock, flags);
 422
 423         /* enable the interrupt and the scanning */
 424         tmp = dz_in(dport, DZ_CSR);
 425         tmp |= DZ_RIE | DZ_TIE | DZ_MSE;
 426         dz_out(dport, DZ_CSR, tmp);
 427
 428         spin_unlock_irqrestore(&dport->port.lock, flags);
 429
 430         return 0;
 431 }
 432
 433 /*
 434  * -------------------------------------------------------------------
 435  * shutdown ()
 436  *
 437  * This routine will shutdown a serial port; interrupts are disabled, and
 438  * DTR is dropped if the hangup on close termio flag is on.
 439  * -------------------------------------------------------------------
 440  */
 441 static void dz_shutdown(struct uart_port *uport)
 442 {
 443         dz_stop_tx(uport);
 444 }
 445
 446 /*
 447  * get_lsr_info - get line status register info
 448  *
 449  * Purpose: Let user call ioctl() to get info when the UART physically
 450  *          is emptied.  On bus types like RS485, the transmitter must
 451  *          release the bus after transmitting. This must be done when
 452  *          the transmit shift register is empty, not be done when the
 453  *          transmit holding register is empty.  This functionality
 454  *          allows an RS485 driver to be written in user space.
 455  */
 456 static unsigned int dz_tx_empty(struct uart_port *uport)
 457 {
 458         struct dz_port *dport = (struct dz_port *)uport;
 459         unsigned short status = dz_in(dport, DZ_LPR);
 460
 461         /* FIXME: this appears to be obviously broken --rmk. */
 462         return status ? TIOCSER_TEMT : 0;
 463 }
 464
 465 static void dz_break_ctl(struct uart_port *uport, int break_state)
 466 {
 467         struct dz_port *dport = (struct dz_port *)uport;
 468         unsigned long flags;
 469         unsigned short tmp, mask = 1 << uport->line;
 470
 471         spin_lock_irqsave(&uport->lock, flags);
 472         tmp = dz_in(dport, DZ_TCR);
 473         if (break_state)
 474                 tmp |= mask;
 475         else
 476                 tmp &= ~mask;
 477         dz_out(dport, DZ_TCR, tmp);
 478         spin_unlock_irqrestore(&uport->lock, flags);
 479 }
 480
 481 static void dz_set_termios(struct uart_port *uport, struct termios *termios,
 482                            struct termios *old_termios)
 483 {
 484         struct dz_port *dport = (struct dz_port *)uport;
 485         unsigned long flags;
 486         unsigned int cflag, baud;
 487
 488         cflag = dport->port.line;
 489
 490         switch (termios->c_cflag & CSIZE) {
 491         case CS5:
 492                 cflag |= DZ_CS5;
 493                 break;
 494         case CS6:
 495                 cflag |= DZ_CS6;
 496                 break;
 497         case CS7:
 498                 cflag |= DZ_CS7;
 499                 break;
 500         case CS8:
 501         default:
 502                 cflag |= DZ_CS8;
 503         }
 504
 505         if (termios->c_cflag & CSTOPB)
 506                 cflag |= DZ_CSTOPB;
 507         if (termios->c_cflag & PARENB)
 508                 cflag |= DZ_PARENB;
 509         if (termios->c_cflag & PARODD)
 510                 cflag |= DZ_PARODD;
 511
 512         baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600);
 513         switch (baud) {
 514         case 50:
 515                 cflag |= DZ_B50;
 516                 break;
 517         case 75:
 518                 cflag |= DZ_B75;
 519                 break;
 520         case 110:
 521                 cflag |= DZ_B110;
 522                 break;
 523         case 134:
 524                 cflag |= DZ_B134;
 525                 break;
 526         case 150:
 527                 cflag |= DZ_B150;
 528                 break;
 529         case 300:
 530                 cflag |= DZ_B300;
 531                 break;
 532         case 600:
 533                 cflag |= DZ_B600;
 534                 break;
 535         case 1200:
 536                 cflag |= DZ_B1200;
 537                 break;
 538         case 1800:
 539                 cflag |= DZ_B1800;
 540                 break;
 541         case 2000:
 542                 cflag |= DZ_B2000;
 543                 break;
 544         case 2400:
 545                 cflag |= DZ_B2400;
 546                 break;
 547         case 3600:
 548                 cflag |= DZ_B3600;
 549                 break;
 550         case 4800:
 551                 cflag |= DZ_B4800;
 552                 break;
 553         case 7200:
 554                 cflag |= DZ_B7200;
 555                 break;
 556         case 9600:
 557         default:
 558                 cflag |= DZ_B9600;
 559         }
 560
 561         if (termios->c_cflag & CREAD)
 562                 cflag |= DZ_RXENAB;
 563
 564         spin_lock_irqsave(&dport->port.lock, flags);
 565
 566         dz_out(dport, DZ_LPR, cflag);
 567         dport->cflag = cflag;
 568
 569         /* setup accept flag */
 570         dport->port.read_status_mask = DZ_OERR;
 571         if (termios->c_iflag & INPCK)
 572                 dport->port.read_status_mask |= DZ_FERR | DZ_PERR;
 573
 574         /* characters to ignore */
 575         uport->ignore_status_mask = 0;
 576         if (termios->c_iflag & IGNPAR)
 577                 dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;
 578
 579         spin_unlock_irqrestore(&dport->port.lock, flags);
 580 }
 581
 582 static const char *dz_type(struct uart_port *port)
 583 {
 584         return "DZ";
 585 }
 586
 587 static void dz_release_port(struct uart_port *port)
 588 {
 589         /* nothing to do */
 590 }
 591
 592 static int dz_request_port(struct uart_port *port)
 593 {
 594         return 0;
 595 }
 596
 597 static void dz_config_port(struct uart_port *port, int flags)
 598 {
 599         if (flags & UART_CONFIG_TYPE)
 600                 port->type = PORT_DZ;
 601 }
 602
 603 /*
 604  * verify the new serial_struct (for TIOCSSERIAL).
 605  */
 606 static int dz_verify_port(struct uart_port *port, struct serial_struct *ser)
 607 {
 608         int ret = 0;
 609         if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
 610                 ret = -EINVAL;
 611         if (ser->irq != port->irq)
 612                 ret = -EINVAL;
 613         return ret;
 614 }
 615
 616 static struct uart_ops dz_ops = {
 617         .tx_empty       = dz_tx_empty,
 618         .get_mctrl      = dz_get_mctrl,
 619         .set_mctrl      = dz_set_mctrl,
 620         .stop_tx        = dz_stop_tx,
 621         .start_tx       = dz_start_tx,
 622         .stop_rx        = dz_stop_rx,
 623         .enable_ms      = dz_enable_ms,
 624         .break_ctl      = dz_break_ctl,
 625         .startup        = dz_startup,
 626         .shutdown       = dz_shutdown,
 627         .set_termios    = dz_set_termios,
 628         .type           = dz_type,
 629         .release_port   = dz_release_port,
 630         .request_port   = dz_request_port,
 631         .config_port    = dz_config_port,
 632         .verify_port    = dz_verify_port,
 633 };
 634
 635 static void __init dz_init_ports(void)
 636 {
 637         static int first = 1;
 638         struct dz_port *dport;
 639         unsigned long base;
 640         int i;
 641
 642         if (!first)
 643                 return;
 644         first = 0;
 645
 646         if (mips_machtype == MACH_DS23100 ||
 647             mips_machtype == MACH_DS5100)
 648                 base = (unsigned long) KN01_DZ11_BASE;
 649         else
 650                 base = (unsigned long) KN02_DZ11_BASE;
 651
 652         for (i = 0, dport = dz_ports; i < DZ_NB_PORT; i++, dport++) {
 653                 spin_lock_init(&dport->port.lock);
 654                 dport->port.membase     = (char *) base;
 655                 dport->port.iotype      = SERIAL_IO_PORT;
 656                 dport->port.irq         = dec_interrupt[DEC_IRQ_DZ11];
 657                 dport->port.line        = i;
 658                 dport->port.fifosize    = 1;
 659                 dport->port.ops         = &dz_ops;
 660                 dport->port.flags       = UPF_BOOT_AUTOCONF;
 661         }
 662 }
 663
 664 static void dz_reset(struct dz_port *dport)
 665 {
 666         dz_out(dport, DZ_CSR, DZ_CLR);
 667
 668         while (dz_in(dport, DZ_CSR) & DZ_CLR);
 669                 /* FIXME: cpu_relax? */
 670
 671         iob();
 672
 673         /* enable scanning */
 674         dz_out(dport, DZ_CSR, DZ_MSE);
 675 }
 676
 677 #ifdef CONFIG_SERIAL_DZ_CONSOLE
 678 static void dz_console_put_char(struct dz_port *dport, unsigned char ch)
 679 {
 680         unsigned long flags;
 681         int loops = 2500;
 682         unsigned short tmp = 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  * dz_console_print ()
 701  *
 702  * dz_console_print is registered for printk.
 703  * The console must be locked when we get here.
 704  * -------------------------------------------------------------------
 705  */
 706 static void dz_console_print(struct console *cons,
 707                              const char *str,
 708                              unsigned int count)
 709 {
 710         struct dz_port *dport = &dz_ports[CONSOLE_LINE];
 711 #ifdef DEBUG_DZ
 712         prom_printf((char *) str);
 713 #endif
 714         while (count--) {
 715                 if (*str == '\n')
 716                         dz_console_put_char(dport, '\r');
 717                 dz_console_put_char(dport, *str++);
 718         }
 719 }
 720
 721 static int __init dz_console_setup(struct console *co, char *options)
 722 {
 723         struct dz_port *dport = &dz_ports[CONSOLE_LINE];
 724         int baud = 9600;
 725         int bits = 8;
 726         int parity = 'n';
 727         int flow = 'n';
 728         int ret;
 729         unsigned short mask, tmp;
 730
 731         if (options)
 732                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 733
 734         dz_reset(dport);
 735
 736         ret = uart_set_options(&dport->port, co, baud, parity, bits, flow);
 737         if (ret == 0) {
 738                 mask = 1 << dport->port.line;
 739                 tmp = dz_in(dport, DZ_TCR);     /* read the TX flag */
 740                 if (!(tmp & mask)) {
 741                         tmp |= mask;            /* set the TX flag */
 742                         dz_out(dport, DZ_TCR, tmp);
 743                 }
 744         }
 745
 746         return ret;
 747 }
 748
 749 static struct console dz_sercons =
 750 {
 751         .name   = "ttyS",
 752         .write  = dz_console_print,
 753         .device = uart_console_device,
 754         .setup  = dz_console_setup,
 755         .flags  = CON_CONSDEV | CON_PRINTBUFFER,
 756         .index  = CONSOLE_LINE,
 757 };
 758
 759 void __init dz_serial_console_init(void)
 760 {
 761         dz_init_ports();
 762
 763         register_console(&dz_sercons);
 764 }
 765
 766 #define SERIAL_DZ_CONSOLE       &dz_sercons
 767 #else
 768 #define SERIAL_DZ_CONSOLE       NULL
 769 #endif /* CONFIG_SERIAL_DZ_CONSOLE */
 770
 771 static struct uart_driver dz_reg = {
 772         .owner                  = THIS_MODULE,
 773         .driver_name            = "serial",
 774 #ifdef CONFIG_DEVFS
 775         .dev_name               = "tts/%d",
 776 #else
 777         .dev_name               = "ttyS%d",
 778 #endif
 779         .major                  = TTY_MAJOR,
 780         .minor                  = 64,
 781         .nr                     = DZ_NB_PORT,
 782         .cons                   = SERIAL_DZ_CONSOLE,
 783 };
 784
 785 int __init dz_init(void)
 786 {
 787         unsigned long flags;
 788         int ret, i;
 789
 790         printk("%s%s\n", dz_name, dz_version);
 791
 792         dz_init_ports();
 793
 794         save_flags(flags);
 795         cli();
 796
 797 #ifndef CONFIG_SERIAL_DZ_CONSOLE
 798         /* reset the chip */
 799         dz_reset(&dz_ports[0]);
 800 #endif
 801
 802         /* order matters here... the trick is that flags
 803            is updated... in request_irq - to immediatedly obliterate
 804            it is unwise. */
 805         restore_flags(flags);
 806
 807         if (request_irq(dz_ports[0].port.irq, dz_interrupt,
 808                         SA_INTERRUPT, "DZ", &dz_ports[0]))
 809                 panic("Unable to register DZ interrupt");
 810
 811         ret = uart_register_driver(&dz_reg);
 812         if (ret != 0)
 813                 return ret;
 814
 815         for (i = 0; i < DZ_NB_PORT; i++)
 816                 uart_add_one_port(&dz_reg, &dz_ports[i].port);
 817
 818         return ret;
 819 }
 820
 821 MODULE_DESCRIPTION("DECstation DZ serial driver");
 822 MODULE_LICENSE("GPL");