drivers/serial/68328serial.c

   1 /* 68328serial.c: Serial port driver for 68328 microcontroller
   2  *
   3  * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>
   4  * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
   5  * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@uclinux.org>
   6  * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>
   7  * Copyright (C) 2002-2003  David McCullough   <davidm@snapgear.com>
   8  * Copyright (C) 2002       Greg Ungerer       <gerg@snapgear.com>
   9  *
  10  * VZ Support/Fixes             Evan Stawnyczy <e@lineo.ca>
  11  * Multiple UART support        Daniel Potts <danielp@cse.unsw.edu.au>
  12  * Power management support     Daniel Potts <danielp@cse.unsw.edu.au>
  13  * VZ Second Serial Port enable Phil Wilshire
  14  * 2.4/2.5 port                 David McCullough
  15  */
  16
  17 #include <asm/dbg.h>
  18 #include <linux/module.h>
  19 #include <linux/errno.h>
  20 #include <linux/signal.h>
  21 #include <linux/sched.h>
  22 #include <linux/timer.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/tty.h>
  25 #include <linux/tty_flip.h>
  26 #include <linux/major.h>
  27 #include <linux/string.h>
  28 #include <linux/fcntl.h>
  29 #include <linux/mm.h>
  30 #include <linux/kernel.h>
  31 #include <linux/console.h>
  32 #include <linux/reboot.h>
  33 #include <linux/keyboard.h>
  34 #include <linux/init.h>
  35 #include <linux/pm.h>
  36 #include <linux/bitops.h>
  37 #include <linux/delay.h>
  38 #include <linux/gfp.h>
  39
  40 #include <asm/io.h>
  41 #include <asm/irq.h>
  42 #include <asm/system.h>
  43 #include <asm/delay.h>
  44 #include <asm/uaccess.h>
  45
  46 /* (es) */
  47 /* note: perhaps we can murge these files, so that you can just
  48  *       define 1 of them, and they can sort that out for themselves
  49  */
  50 #if defined(CONFIG_M68EZ328)
  51 #include <asm/MC68EZ328.h>
  52 #else
  53 #if defined(CONFIG_M68VZ328)
  54 #include <asm/MC68VZ328.h>
  55 #else
  56 #include <asm/MC68328.h>
  57 #endif /* CONFIG_M68VZ328 */
  58 #endif /* CONFIG_M68EZ328 */
  59
  60 #include "68328serial.h"
  61
  62 /* Turn off usage of real serial interrupt code, to "support" Copilot */
  63 #ifdef CONFIG_XCOPILOT_BUGS
  64 #undef USE_INTS
  65 #else
  66 #define USE_INTS
  67 #endif
  68
  69 static struct m68k_serial m68k_soft[NR_PORTS];
  70
  71 static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
  72
  73 /* multiple ports are contiguous in memory */
  74 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
  75
  76 struct tty_struct m68k_ttys;
  77 struct m68k_serial *m68k_consinfo = 0;
  78
  79 #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
  80
  81 struct tty_driver *serial_driver;
  82
  83 /* number of characters left in xmit buffer before we ask for more */
  84 #define WAKEUP_CHARS 256
  85
  86 /* Debugging... DEBUG_INTR is bad to use when one of the zs
  87  * lines is your console ;(
  88  */
  89 #undef SERIAL_DEBUG_INTR
  90 #undef SERIAL_DEBUG_OPEN
  91 #undef SERIAL_DEBUG_FLOW
  92
  93 #define RS_ISR_PASS_LIMIT 256
  94
  95 static void change_speed(struct m68k_serial *info);
  96
  97 /*
  98  *      Setup for console. Argument comes from the boot command line.
  99  */
 100
 101 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
 102 #define CONSOLE_BAUD_RATE       115200
 103 #define DEFAULT_CBAUD           B115200
 104 #else
 105         /* (es) */
 106         /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
 107         #ifdef CONFIG_M68VZ328
 108         #define CONSOLE_BAUD_RATE       19200
 109         #define DEFAULT_CBAUD           B19200
 110         #endif
 111         /* (/es) */
 112 #endif
 113
 114 #ifndef CONSOLE_BAUD_RATE
 115 #define CONSOLE_BAUD_RATE       9600
 116 #define DEFAULT_CBAUD           B9600
 117 #endif
 118
 119
 120 static int m68328_console_initted = 0;
 121 static int m68328_console_baud    = CONSOLE_BAUD_RATE;
 122 static int m68328_console_cbaud   = DEFAULT_CBAUD;
 123
 124
 125 static inline int serial_paranoia_check(struct m68k_serial *info,
 126                                         char *name, const char *routine)
 127 {
 128 #ifdef SERIAL_PARANOIA_CHECK
 129         static const char *badmagic =
 130                 "Warning: bad magic number for serial struct %s in %s\n";
 131         static const char *badinfo =
 132                 "Warning: null m68k_serial for %s in %s\n";
 133
 134         if (!info) {
 135                 printk(badinfo, name, routine);
 136                 return 1;
 137         }
 138         if (info->magic != SERIAL_MAGIC) {
 139                 printk(badmagic, name, routine);
 140                 return 1;
 141         }
 142 #endif
 143         return 0;
 144 }
 145
 146 /*
 147  * This is used to figure out the divisor speeds and the timeouts
 148  */
 149 static int baud_table[] = {
 150         0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
 151         9600, 19200, 38400, 57600, 115200, 0 };
 152
 153 /* Sets or clears DTR/RTS on the requested line */
 154 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
 155 {
 156         if (set) {
 157                 /* set the RTS/CTS line */
 158         } else {
 159                 /* clear it */
 160         }
 161         return;
 162 }
 163
 164 /* Utility routines */
 165 static inline int get_baud(struct m68k_serial *ss)
 166 {
 167         unsigned long result = 115200;
 168         unsigned short int baud = uart_addr[ss->line].ubaud;
 169         if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
 170         result >>= GET_FIELD(baud, UBAUD_DIVIDE);
 171
 172         return result;
 173 }
 174
 175 /*
 176  * ------------------------------------------------------------
 177  * rs_stop() and rs_start()
 178  *
 179  * This routines are called before setting or resetting tty->stopped.
 180  * They enable or disable transmitter interrupts, as necessary.
 181  * ------------------------------------------------------------
 182  */
 183 static void rs_stop(struct tty_struct *tty)
 184 {
 185         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 186         m68328_uart *uart = &uart_addr[info->line];
 187         unsigned long flags;
 188
 189         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 190                 return;
 191
 192         local_irq_save(flags);
 193         uart->ustcnt &= ~USTCNT_TXEN;
 194         local_irq_restore(flags);
 195 }
 196
 197 static int rs_put_char(char ch)
 198 {
 199         int flags, loops = 0;
 200
 201         local_irq_save(flags);
 202
 203         while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
 204                 loops++;
 205                 udelay(5);
 206         }
 207
 208         UTX_TXDATA = ch;
 209         udelay(5);
 210         local_irq_restore(flags);
 211         return 1;
 212 }
 213
 214 static void rs_start(struct tty_struct *tty)
 215 {
 216         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 217         m68328_uart *uart = &uart_addr[info->line];
 218         unsigned long flags;
 219
 220         if (serial_paranoia_check(info, tty->name, "rs_start"))
 221                 return;
 222
 223         local_irq_save(flags);
 224         if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
 225 #ifdef USE_INTS
 226                 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 227 #else
 228                 uart->ustcnt |= USTCNT_TXEN;
 229 #endif
 230         }
 231         local_irq_restore(flags);
 232 }
 233
 234 /* Drop into either the boot monitor or kadb upon receiving a break
 235  * from keyboard/console input.
 236  */
 237 static void batten_down_hatches(void)
 238 {
 239         /* Drop into the debugger */
 240 }
 241
 242 static void status_handle(struct m68k_serial *info, unsigned short status)
 243 {
 244 #if 0
 245         if(status & DCD) {
 246                 if((info->port.tty->termios->c_cflag & CRTSCTS) &&
 247                    ((info->curregs[3] & AUTO_ENAB)==0)) {
 248                         info->curregs[3] |= AUTO_ENAB;
 249                         info->pendregs[3] |= AUTO_ENAB;
 250                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 251                 }
 252         } else {
 253                 if((info->curregs[3] & AUTO_ENAB)) {
 254                         info->curregs[3] &= ~AUTO_ENAB;
 255                         info->pendregs[3] &= ~AUTO_ENAB;
 256                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 257                 }
 258         }
 259 #endif
 260         /* If this is console input and this is a
 261          * 'break asserted' status change interrupt
 262          * see if we can drop into the debugger
 263          */
 264         if((status & URX_BREAK) && info->break_abort)
 265                 batten_down_hatches();
 266         return;
 267 }
 268
 269 static void receive_chars(struct m68k_serial *info, unsigned short rx)
 270 {
 271         struct tty_struct *tty = info->port.tty;
 272         m68328_uart *uart = &uart_addr[info->line];
 273         unsigned char ch, flag;
 274
 275         /*
 276          * This do { } while() loop will get ALL chars out of Rx FIFO
 277          */
 278 #ifndef CONFIG_XCOPILOT_BUGS
 279         do {
 280 #endif
 281                 ch = GET_FIELD(rx, URX_RXDATA);
 282
 283                 if(info->is_cons) {
 284                         if(URX_BREAK & rx) { /* whee, break received */
 285                                 status_handle(info, rx);
 286                                 return;
 287 #ifdef CONFIG_MAGIC_SYSRQ
 288                         } else if (ch == 0x10) { /* ^P */
 289                                 show_state();
 290                                 show_free_areas();
 291                                 show_buffers();
 292 /*                              show_net_buffers(); */
 293                                 return;
 294                         } else if (ch == 0x12) { /* ^R */
 295                                 emergency_restart();
 296                                 return;
 297 #endif /* CONFIG_MAGIC_SYSRQ */
 298                         }
 299                 }
 300
 301                 if(!tty)
 302                         goto clear_and_exit;
 303
 304                 flag = TTY_NORMAL;
 305
 306                 if(rx & URX_PARITY_ERROR) {
 307                         flag = TTY_PARITY;
 308                         status_handle(info, rx);
 309                 } else if(rx & URX_OVRUN) {
 310                         flag = TTY_OVERRUN;
 311                         status_handle(info, rx);
 312                 } else if(rx & URX_FRAME_ERROR) {
 313                         flag = TTY_FRAME;
 314                         status_handle(info, rx);
 315                 }
 316                 tty_insert_flip_char(tty, ch, flag);
 317 #ifndef CONFIG_XCOPILOT_BUGS
 318         } while((rx = uart->urx.w) & URX_DATA_READY);
 319 #endif
 320
 321         tty_schedule_flip(tty);
 322
 323 clear_and_exit:
 324         return;
 325 }
 326
 327 static void transmit_chars(struct m68k_serial *info)
 328 {
 329         m68328_uart *uart = &uart_addr[info->line];
 330
 331         if (info->x_char) {
 332                 /* Send next char */
 333                 uart->utx.b.txdata = info->x_char;
 334                 info->x_char = 0;
 335                 goto clear_and_return;
 336         }
 337
 338         if((info->xmit_cnt <= 0) || info->port.tty->stopped) {
 339                 /* That's peculiar... TX ints off */
 340                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 341                 goto clear_and_return;
 342         }
 343
 344         /* Send char */
 345         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 346         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 347         info->xmit_cnt--;
 348
 349         if (info->xmit_cnt < WAKEUP_CHARS)
 350                 schedule_work(&info->tqueue);
 351
 352         if(info->xmit_cnt <= 0) {
 353                 /* All done for now... TX ints off */
 354                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 355                 goto clear_and_return;
 356         }
 357
 358 clear_and_return:
 359         /* Clear interrupt (should be auto)*/
 360         return;
 361 }
 362
 363 /*
 364  * This is the serial driver's generic interrupt routine
 365  */
 366 irqreturn_t rs_interrupt(int irq, void *dev_id)
 367 {
 368         struct m68k_serial *info = dev_id;
 369         m68328_uart *uart;
 370         unsigned short rx;
 371         unsigned short tx;
 372
 373         uart = &uart_addr[info->line];
 374         rx = uart->urx.w;
 375
 376 #ifdef USE_INTS
 377         tx = uart->utx.w;
 378
 379         if (rx & URX_DATA_READY) receive_chars(info, rx);
 380         if (tx & UTX_TX_AVAIL)   transmit_chars(info);
 381 #else
 382         receive_chars(info, rx);
 383 #endif
 384         return IRQ_HANDLED;
 385 }
 386
 387 static void do_softint(struct work_struct *work)
 388 {
 389         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue);
 390         struct tty_struct       *tty;
 391
 392         tty = info->port.tty;
 393         if (!tty)
 394                 return;
 395 #if 0
 396         if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
 397                 tty_wakeup(tty);
 398         }
 399 #endif
 400 }
 401
 402 /*
 403  * This routine is called from the scheduler tqueue when the interrupt
 404  * routine has signalled that a hangup has occurred.  The path of
 405  * hangup processing is:
 406  *
 407  *      serial interrupt routine -> (scheduler tqueue) ->
 408  *      do_serial_hangup() -> tty->hangup() -> rs_hangup()
 409  *
 410  */
 411 static void do_serial_hangup(struct work_struct *work)
 412 {
 413         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue_hangup);
 414         struct tty_struct       *tty;
 415
 416         tty = info->port.tty;
 417         if (!tty)
 418                 return;
 419
 420         tty_hangup(tty);
 421 }
 422
 423
 424 static int startup(struct m68k_serial * info)
 425 {
 426         m68328_uart *uart = &uart_addr[info->line];
 427         unsigned long flags;
 428
 429         if (info->flags & S_INITIALIZED)
 430                 return 0;
 431
 432         if (!info->xmit_buf) {
 433                 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
 434                 if (!info->xmit_buf)
 435                         return -ENOMEM;
 436         }
 437
 438         local_irq_save(flags);
 439
 440         /*
 441          * Clear the FIFO buffers and disable them
 442          * (they will be reenabled in change_speed())
 443          */
 444
 445         uart->ustcnt = USTCNT_UEN;
 446         info->xmit_fifo_size = 1;
 447         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
 448         (void)uart->urx.w;
 449
 450         /*
 451          * Finally, enable sequencing and interrupts
 452          */
 453 #ifdef USE_INTS
 454         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
 455                  USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
 456 #else
 457         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
 458 #endif
 459
 460         if (info->port.tty)
 461                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
 462         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 463
 464         /*
 465          * and set the speed of the serial port
 466          */
 467
 468         change_speed(info);
 469
 470         info->flags |= S_INITIALIZED;
 471         local_irq_restore(flags);
 472         return 0;
 473 }
 474
 475 /*
 476  * This routine will shutdown a serial port; interrupts are disabled, and
 477  * DTR is dropped if the hangup on close termio flag is on.
 478  */
 479 static void shutdown(struct m68k_serial * info)
 480 {
 481         m68328_uart *uart = &uart_addr[info->line];
 482         unsigned long   flags;
 483
 484         uart->ustcnt = 0; /* All off! */
 485         if (!(info->flags & S_INITIALIZED))
 486                 return;
 487
 488         local_irq_save(flags);
 489
 490         if (info->xmit_buf) {
 491                 free_page((unsigned long) info->xmit_buf);
 492                 info->xmit_buf = 0;
 493         }
 494
 495         if (info->port.tty)
 496                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 497
 498         info->flags &= ~S_INITIALIZED;
 499         local_irq_restore(flags);
 500 }
 501
 502 struct {
 503         int divisor, prescale;
 504 }
 505 #ifndef CONFIG_M68VZ328
 506  hw_baud_table[18] = {
 507         {0,0}, /* 0 */
 508         {0,0}, /* 50 */
 509         {0,0}, /* 75 */
 510         {0,0}, /* 110 */
 511         {0,0}, /* 134 */
 512         {0,0}, /* 150 */
 513         {0,0}, /* 200 */
 514         {7,0x26}, /* 300 */
 515         {6,0x26}, /* 600 */
 516         {5,0x26}, /* 1200 */
 517         {0,0}, /* 1800 */
 518         {4,0x26}, /* 2400 */
 519         {3,0x26}, /* 4800 */
 520         {2,0x26}, /* 9600 */
 521         {1,0x26}, /* 19200 */
 522         {0,0x26}, /* 38400 */
 523         {1,0x38}, /* 57600 */
 524         {0,0x38}, /* 115200 */
 525 };
 526 #else
 527  hw_baud_table[18] = {
 528                  {0,0}, /* 0 */
 529                  {0,0}, /* 50 */
 530                  {0,0}, /* 75 */
 531                  {0,0}, /* 110 */
 532                  {0,0}, /* 134 */
 533                  {0,0}, /* 150 */
 534                  {0,0}, /* 200 */
 535                  {0,0}, /* 300 */
 536                  {7,0x26}, /* 600 */
 537                  {6,0x26}, /* 1200 */
 538                  {0,0}, /* 1800 */
 539                  {5,0x26}, /* 2400 */
 540                  {4,0x26}, /* 4800 */
 541                  {3,0x26}, /* 9600 */
 542                  {2,0x26}, /* 19200 */
 543                  {1,0x26}, /* 38400 */
 544                  {0,0x26}, /* 57600 */
 545                  {1,0x38}, /* 115200 */
 546 };
 547 #endif
 548 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
 549
 550 /*
 551  * This routine is called to set the UART divisor registers to match
 552  * the specified baud rate for a serial port.
 553  */
 554 static void change_speed(struct m68k_serial *info)
 555 {
 556         m68328_uart *uart = &uart_addr[info->line];
 557         unsigned short port;
 558         unsigned short ustcnt;
 559         unsigned cflag;
 560         int     i;
 561
 562         if (!info->port.tty || !info->port.tty->termios)
 563                 return;
 564         cflag = info->port.tty->termios->c_cflag;
 565         if (!(port = info->port))
 566                 return;
 567
 568         ustcnt = uart->ustcnt;
 569         uart->ustcnt = ustcnt & ~USTCNT_TXEN;
 570
 571         i = cflag & CBAUD;
 572         if (i & CBAUDEX) {
 573                 i = (i & ~CBAUDEX) + B38400;
 574         }
 575
 576         info->baud = baud_table[i];
 577         uart->ubaud = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
 578                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
 579
 580         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
 581
 582         if ((cflag & CSIZE) == CS8)
 583                 ustcnt |= USTCNT_8_7;
 584
 585         if (cflag & CSTOPB)
 586                 ustcnt |= USTCNT_STOP;
 587
 588         if (cflag & PARENB)
 589                 ustcnt |= USTCNT_PARITYEN;
 590         if (cflag & PARODD)
 591                 ustcnt |= USTCNT_ODD_EVEN;
 592
 593 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 594         if (cflag & CRTSCTS) {
 595                 uart->utx.w &= ~ UTX_NOCTS;
 596         } else {
 597                 uart->utx.w |= UTX_NOCTS;
 598         }
 599 #endif
 600
 601         ustcnt |= USTCNT_TXEN;
 602
 603         uart->ustcnt = ustcnt;
 604         return;
 605 }
 606
 607 /*
 608  * Fair output driver allows a process to speak.
 609  */
 610 static void rs_fair_output(void)
 611 {
 612         int left;               /* Output no more than that */
 613         unsigned long flags;
 614         struct m68k_serial *info = &m68k_soft[0];
 615         char c;
 616
 617         if (info == 0) return;
 618         if (info->xmit_buf == 0) return;
 619
 620         local_irq_save(flags);
 621         left = info->xmit_cnt;
 622         while (left != 0) {
 623                 c = info->xmit_buf[info->xmit_tail];
 624                 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
 625                 info->xmit_cnt--;
 626                 local_irq_restore(flags);
 627
 628                 rs_put_char(c);
 629
 630                 local_irq_save(flags);
 631                 left = min(info->xmit_cnt, left-1);
 632         }
 633
 634         /* Last character is being transmitted now (hopefully). */
 635         udelay(5);
 636
 637         local_irq_restore(flags);
 638         return;
 639 }
 640
 641 /*
 642  * m68k_console_print is registered for printk.
 643  */
 644 void console_print_68328(const char *p)
 645 {
 646         char c;
 647
 648         while((c=*(p++)) != 0) {
 649                 if(c == '\n')
 650                         rs_put_char('\r');
 651                 rs_put_char(c);
 652         }
 653
 654         /* Comment this if you want to have a strict interrupt-driven output */
 655         rs_fair_output();
 656
 657         return;
 658 }
 659
 660 static void rs_set_ldisc(struct tty_struct *tty)
 661 {
 662         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 663
 664         if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
 665                 return;
 666
 667         info->is_cons = (tty->termios->c_line == N_TTY);
 668
 669         printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
 670 }
 671
 672 static void rs_flush_chars(struct tty_struct *tty)
 673 {
 674         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 675         m68328_uart *uart = &uart_addr[info->line];
 676         unsigned long flags;
 677
 678         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 679                 return;
 680 #ifndef USE_INTS
 681         for(;;) {
 682 #endif
 683
 684         /* Enable transmitter */
 685         local_irq_save(flags);
 686
 687         if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
 688                         !info->xmit_buf) {
 689                 local_irq_restore(flags);
 690                 return;
 691         }
 692
 693 #ifdef USE_INTS
 694         uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 695 #else
 696         uart->ustcnt |= USTCNT_TXEN;
 697 #endif
 698
 699 #ifdef USE_INTS
 700         if (uart->utx.w & UTX_TX_AVAIL) {
 701 #else
 702         if (1) {
 703 #endif
 704                 /* Send char */
 705                 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 706                 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 707                 info->xmit_cnt--;
 708         }
 709
 710 #ifndef USE_INTS
 711         while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 712         }
 713 #endif
 714         local_irq_restore(flags);
 715 }
 716
 717 extern void console_printn(const char * b, int count);
 718
 719 static int rs_write(struct tty_struct * tty,
 720                     const unsigned char *buf, int count)
 721 {
 722         int     c, total = 0;
 723         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 724         m68328_uart *uart = &uart_addr[info->line];
 725         unsigned long flags;
 726
 727         if (serial_paranoia_check(info, tty->name, "rs_write"))
 728                 return 0;
 729
 730         if (!tty || !info->xmit_buf)
 731                 return 0;
 732
 733         local_save_flags(flags);
 734         while (1) {
 735                 local_irq_disable();
 736                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
 737                                    SERIAL_XMIT_SIZE - info->xmit_head));
 738                 local_irq_restore(flags);
 739
 740                 if (c <= 0)
 741                         break;
 742
 743                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
 744
 745                 local_irq_disable();
 746                 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
 747                 info->xmit_cnt += c;
 748                 local_irq_restore(flags);
 749                 buf += c;
 750                 count -= c;
 751                 total += c;
 752         }
 753
 754         if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
 755                 /* Enable transmitter */
 756                 local_irq_disable();
 757 #ifndef USE_INTS
 758                 while(info->xmit_cnt) {
 759 #endif
 760
 761                 uart->ustcnt |= USTCNT_TXEN;
 762 #ifdef USE_INTS
 763                 uart->ustcnt |= USTCNT_TX_INTR_MASK;
 764 #else
 765                 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 766 #endif
 767                 if (uart->utx.w & UTX_TX_AVAIL) {
 768                         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 769                         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 770                         info->xmit_cnt--;
 771                 }
 772
 773 #ifndef USE_INTS
 774                 }
 775 #endif
 776                 local_irq_restore(flags);
 777         }
 778
 779         return total;
 780 }
 781
 782 static int rs_write_room(struct tty_struct *tty)
 783 {
 784         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 785         int     ret;
 786
 787         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 788                 return 0;
 789         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
 790         if (ret < 0)
 791                 ret = 0;
 792         return ret;
 793 }
 794
 795 static int rs_chars_in_buffer(struct tty_struct *tty)
 796 {
 797         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 798
 799         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 800                 return 0;
 801         return info->xmit_cnt;
 802 }
 803
 804 static void rs_flush_buffer(struct tty_struct *tty)
 805 {
 806         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 807         unsigned long flags;
 808
 809         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 810                 return;
 811         local_irq_save(flags);
 812         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 813         local_irq_restore(flags);
 814         tty_wakeup(tty);
 815 }
 816
 817 /*
 818  * ------------------------------------------------------------
 819  * rs_throttle()
 820  *
 821  * This routine is called by the upper-layer tty layer to signal that
 822  * incoming characters should be throttled.
 823  * ------------------------------------------------------------
 824  */
 825 static void rs_throttle(struct tty_struct * tty)
 826 {
 827         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 828
 829         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 830                 return;
 831
 832         if (I_IXOFF(tty))
 833                 info->x_char = STOP_CHAR(tty);
 834
 835         /* Turn off RTS line (do this atomic) */
 836 }
 837
 838 static void rs_unthrottle(struct tty_struct * tty)
 839 {
 840         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 841
 842         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
 843                 return;
 844
 845         if (I_IXOFF(tty)) {
 846                 if (info->x_char)
 847                         info->x_char = 0;
 848                 else
 849                         info->x_char = START_CHAR(tty);
 850         }
 851
 852         /* Assert RTS line (do this atomic) */
 853 }
 854
 855 /*
 856  * ------------------------------------------------------------
 857  * rs_ioctl() and friends
 858  * ------------------------------------------------------------
 859  */
 860
 861 static int get_serial_info(struct m68k_serial * info,
 862                            struct serial_struct * retinfo)
 863 {
 864         struct serial_struct tmp;
 865
 866         if (!retinfo)
 867                 return -EFAULT;
 868         memset(&tmp, 0, sizeof(tmp));
 869         tmp.type = info->type;
 870         tmp.line = info->line;
 871         tmp.port = info->port;
 872         tmp.irq = info->irq;
 873         tmp.flags = info->flags;
 874         tmp.baud_base = info->baud_base;
 875         tmp.close_delay = info->close_delay;
 876         tmp.closing_wait = info->closing_wait;
 877         tmp.custom_divisor = info->custom_divisor;
 878         copy_to_user(retinfo,&tmp,sizeof(*retinfo));
 879         return 0;
 880 }
 881
 882 static int set_serial_info(struct m68k_serial * info,
 883                            struct serial_struct * new_info)
 884 {
 885         struct serial_struct new_serial;
 886         struct m68k_serial old_info;
 887         int                     retval = 0;
 888
 889         if (!new_info)
 890                 return -EFAULT;
 891         copy_from_user(&new_serial,new_info,sizeof(new_serial));
 892         old_info = *info;
 893
 894         if (!capable(CAP_SYS_ADMIN)) {
 895                 if ((new_serial.baud_base != info->baud_base) ||
 896                     (new_serial.type != info->type) ||
 897                     (new_serial.close_delay != info->close_delay) ||
 898                     ((new_serial.flags & ~S_USR_MASK) !=
 899                      (info->flags & ~S_USR_MASK)))
 900                         return -EPERM;
 901                 info->flags = ((info->flags & ~S_USR_MASK) |
 902                                (new_serial.flags & S_USR_MASK));
 903                 info->custom_divisor = new_serial.custom_divisor;
 904                 goto check_and_exit;
 905         }
 906
 907         if (info->count > 1)
 908                 return -EBUSY;
 909
 910         /*
 911          * OK, past this point, all the error checking has been done.
 912          * At this point, we start making changes.....
 913          */
 914
 915         info->baud_base = new_serial.baud_base;
 916         info->flags = ((info->flags & ~S_FLAGS) |
 917                         (new_serial.flags & S_FLAGS));
 918         info->type = new_serial.type;
 919         info->close_delay = new_serial.close_delay;
 920         info->closing_wait = new_serial.closing_wait;
 921
 922 check_and_exit:
 923         retval = startup(info);
 924         return retval;
 925 }
 926
 927 /*
 928  * get_lsr_info - get line status register info
 929  *
 930  * Purpose: Let user call ioctl() to get info when the UART physically
 931  *          is emptied.  On bus types like RS485, the transmitter must
 932  *          release the bus after transmitting. This must be done when
 933  *          the transmit shift register is empty, not be done when the
 934  *          transmit holding register is empty.  This functionality
 935  *          allows an RS485 driver to be written in user space.
 936  */
 937 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
 938 {
 939 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 940         m68328_uart *uart = &uart_addr[info->line];
 941 #endif
 942         unsigned char status;
 943         unsigned long flags;
 944
 945         local_irq_save(flags);
 946 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 947         status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
 948 #else
 949         status = 0;
 950 #endif
 951         local_irq_restore(flags);
 952         put_user(status,value);
 953         return 0;
 954 }
 955
 956 /*
 957  * This routine sends a break character out the serial port.
 958  */
 959 static void send_break(struct m68k_serial * info, unsigned int duration)
 960 {
 961         m68328_uart *uart = &uart_addr[info->line];
 962         unsigned long flags;
 963         if (!info->port)
 964                 return;
 965         local_irq_save(flags);
 966 #ifdef USE_INTS
 967         uart->utx.w |= UTX_SEND_BREAK;
 968         msleep_interruptible(duration);
 969         uart->utx.w &= ~UTX_SEND_BREAK;
 970 #endif
 971         local_irq_restore(flags);
 972 }
 973
 974 static int rs_ioctl(struct tty_struct *tty, struct file * file,
 975                     unsigned int cmd, unsigned long arg)
 976 {
 977         int error;
 978         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
 979         int retval;
 980
 981         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
 982                 return -ENODEV;
 983
 984         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 985             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
 986             (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
 987                 if (tty->flags & (1 << TTY_IO_ERROR))
 988                     return -EIO;
 989         }
 990
 991         switch (cmd) {
 992                 case TCSBRK:    /* SVID version: non-zero arg --> no break */
 993                         retval = tty_check_change(tty);
 994                         if (retval)
 995                                 return retval;
 996                         tty_wait_until_sent(tty, 0);
 997                         if (!arg)
 998                                 send_break(info, 250);  /* 1/4 second */
 999                         return 0;
1000                 case TCSBRKP:   /* support for POSIX tcsendbreak() */
1001                         retval = tty_check_change(tty);
1002                         if (retval)
1003                                 return retval;
1004                         tty_wait_until_sent(tty, 0);
1005                         send_break(info, arg ? arg*(100) : 250);
1006                         return 0;
1007                 case TIOCGSERIAL:
1008                         if (access_ok(VERIFY_WRITE, (void *) arg,
1009                                                 sizeof(struct serial_struct)))
1010                                 return get_serial_info(info,
1011                                                (struct serial_struct *) arg);
1012                         return -EFAULT;
1013                 case TIOCSSERIAL:
1014                         return set_serial_info(info,
1015                                                (struct serial_struct *) arg);
1016                 case TIOCSERGETLSR: /* Get line status register */
1017                         if (access_ok(VERIFY_WRITE, (void *) arg,
1018                                                 sizeof(unsigned int)))
1019                                 return get_lsr_info(info, (unsigned int *) arg);
1020                         return -EFAULT;
1021                 case TIOCSERGSTRUCT:
1022                         if (!access_ok(VERIFY_WRITE, (void *) arg,
1023                                                 sizeof(struct m68k_serial)))
1024                                 return -EFAULT;
1025                         copy_to_user((struct m68k_serial *) arg,
1026                                     info, sizeof(struct m68k_serial));
1027                         return 0;
1028
1029                 default:
1030                         return -ENOIOCTLCMD;
1031                 }
1032         return 0;
1033 }
1034
1035 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1036 {
1037         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1038
1039         change_speed(info);
1040
1041         if ((old_termios->c_cflag & CRTSCTS) &&
1042             !(tty->termios->c_cflag & CRTSCTS)) {
1043                 tty->hw_stopped = 0;
1044                 rs_start(tty);
1045         }
1046
1047 }
1048
1049 /*
1050  * ------------------------------------------------------------
1051  * rs_close()
1052  *
1053  * This routine is called when the serial port gets closed.  First, we
1054  * wait for the last remaining data to be sent.  Then, we unlink its
1055  * S structure from the interrupt chain if necessary, and we free
1056  * that IRQ if nothing is left in the chain.
1057  * ------------------------------------------------------------
1058  */
1059 static void rs_close(struct tty_struct *tty, struct file * filp)
1060 {
1061         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1062         m68328_uart *uart = &uart_addr[info->line];
1063         unsigned long flags;
1064
1065         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1066                 return;
1067
1068         local_irq_save(flags);
1069
1070         if (tty_hung_up_p(filp)) {
1071                 local_irq_restore(flags);
1072                 return;
1073         }
1074
1075         if ((tty->count == 1) && (info->count != 1)) {
1076                 /*
1077                  * Uh, oh.  tty->count is 1, which means that the tty
1078                  * structure will be freed.  Info->count should always
1079                  * be one in these conditions.  If it's greater than
1080                  * one, we've got real problems, since it means the
1081                  * serial port won't be shutdown.
1082                  */
1083                 printk("rs_close: bad serial port count; tty->count is 1, "
1084                        "info->count is %d\n", info->count);
1085                 info->count = 1;
1086         }
1087         if (--info->count < 0) {
1088                 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1089                        info->line, info->count);
1090                 info->count = 0;
1091         }
1092         if (info->count) {
1093                 local_irq_restore(flags);
1094                 return;
1095         }
1096         info->flags |= S_CLOSING;
1097         /*
1098          * Now we wait for the transmit buffer to clear; and we notify
1099          * the line discipline to only process XON/XOFF characters.
1100          */
1101         tty->closing = 1;
1102         if (info->closing_wait != S_CLOSING_WAIT_NONE)
1103                 tty_wait_until_sent(tty, info->closing_wait);
1104         /*
1105          * At this point we stop accepting input.  To do this, we
1106          * disable the receive line status interrupts, and tell the
1107          * interrupt driver to stop checking the data ready bit in the
1108          * line status register.
1109          */
1110
1111         uart->ustcnt &= ~USTCNT_RXEN;
1112         uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1113
1114         shutdown(info);
1115         rs_flush_buffer(tty);
1116
1117         tty_ldisc_flush(tty);
1118         tty->closing = 0;
1119         info->event = 0;
1120         info->port.tty = NULL;
1121 #warning "This is not and has never been valid so fix it"
1122 #if 0
1123         if (tty->ldisc.num != ldiscs[N_TTY].num) {
1124                 if (tty->ldisc.close)
1125                         (tty->ldisc.close)(tty);
1126                 tty->ldisc = ldiscs[N_TTY];
1127                 tty->termios->c_line = N_TTY;
1128                 if (tty->ldisc.open)
1129                         (tty->ldisc.open)(tty);
1130         }
1131 #endif
1132         if (info->blocked_open) {
1133                 if (info->close_delay) {
1134                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1135                 }
1136                 wake_up_interruptible(&info->open_wait);
1137         }
1138         info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1139         wake_up_interruptible(&info->close_wait);
1140         local_irq_restore(flags);
1141 }
1142
1143 /*
1144  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1145  */
1146 void rs_hangup(struct tty_struct *tty)
1147 {
1148         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1149
1150         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1151                 return;
1152
1153         rs_flush_buffer(tty);
1154         shutdown(info);
1155         info->event = 0;
1156         info->count = 0;
1157         info->flags &= ~S_NORMAL_ACTIVE;
1158         info->port.tty = NULL;
1159         wake_up_interruptible(&info->open_wait);
1160 }
1161
1162 /*
1163  * ------------------------------------------------------------
1164  * rs_open() and friends
1165  * ------------------------------------------------------------
1166  */
1167 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1168                            struct m68k_serial *info)
1169 {
1170         DECLARE_WAITQUEUE(wait, current);
1171         int             retval;
1172         int             do_clocal = 0;
1173
1174         /*
1175          * If the device is in the middle of being closed, then block
1176          * until it's done, and then try again.
1177          */
1178         if (info->flags & S_CLOSING) {
1179                 interruptible_sleep_on(&info->close_wait);
1180 #ifdef SERIAL_DO_RESTART
1181                 if (info->flags & S_HUP_NOTIFY)
1182                         return -EAGAIN;
1183                 else
1184                         return -ERESTARTSYS;
1185 #else
1186                 return -EAGAIN;
1187 #endif
1188         }
1189
1190         /*
1191          * If non-blocking mode is set, or the port is not enabled,
1192          * then make the check up front and then exit.
1193          */
1194         if ((filp->f_flags & O_NONBLOCK) ||
1195             (tty->flags & (1 << TTY_IO_ERROR))) {
1196                 info->flags |= S_NORMAL_ACTIVE;
1197                 return 0;
1198         }
1199
1200         if (tty->termios->c_cflag & CLOCAL)
1201                 do_clocal = 1;
1202
1203         /*
1204          * Block waiting for the carrier detect and the line to become
1205          * free (i.e., not in use by the callout).  While we are in
1206          * this loop, info->count is dropped by one, so that
1207          * rs_close() knows when to free things.  We restore it upon
1208          * exit, either normal or abnormal.
1209          */
1210         retval = 0;
1211         add_wait_queue(&info->open_wait, &wait);
1212
1213         info->count--;
1214         info->blocked_open++;
1215         while (1) {
1216                 local_irq_disable();
1217                 m68k_rtsdtr(info, 1);
1218                 local_irq_enable();
1219                 current->state = TASK_INTERRUPTIBLE;
1220                 if (tty_hung_up_p(filp) ||
1221                     !(info->flags & S_INITIALIZED)) {
1222 #ifdef SERIAL_DO_RESTART
1223                         if (info->flags & S_HUP_NOTIFY)
1224                                 retval = -EAGAIN;
1225                         else
1226                                 retval = -ERESTARTSYS;
1227 #else
1228                         retval = -EAGAIN;
1229 #endif
1230                         break;
1231                 }
1232                 if (!(info->flags & S_CLOSING) && do_clocal)
1233                         break;
1234                 if (signal_pending(current)) {
1235                         retval = -ERESTARTSYS;
1236                         break;
1237                 }
1238                 schedule();
1239         }
1240         current->state = TASK_RUNNING;
1241         remove_wait_queue(&info->open_wait, &wait);
1242         if (!tty_hung_up_p(filp))
1243                 info->count++;
1244         info->blocked_open--;
1245
1246         if (retval)
1247                 return retval;
1248         info->flags |= S_NORMAL_ACTIVE;
1249         return 0;
1250 }
1251
1252 /*
1253  * This routine is called whenever a serial port is opened.  It
1254  * enables interrupts for a serial port, linking in its S structure into
1255  * the IRQ chain.   It also performs the serial-specific
1256  * initialization for the tty structure.
1257  */
1258 int rs_open(struct tty_struct *tty, struct file * filp)
1259 {
1260         struct m68k_serial      *info;
1261         int                     retval, line;
1262
1263         line = tty->index;
1264
1265         if (line >= NR_PORTS || line < 0) /* we have exactly one */
1266                 return -ENODEV;
1267
1268         info = &m68k_soft[line];
1269
1270         if (serial_paranoia_check(info, tty->name, "rs_open"))
1271                 return -ENODEV;
1272
1273         info->count++;
1274         tty->driver_data = info;
1275         info->port.tty = tty;
1276
1277         /*
1278          * Start up serial port
1279          */
1280         retval = startup(info);
1281         if (retval)
1282                 return retval;
1283
1284         return block_til_ready(tty, filp, info);
1285 }
1286
1287 /* Finally, routines used to initialize the serial driver. */
1288
1289 static void show_serial_version(void)
1290 {
1291         printk("MC68328 serial driver version 1.00\n");
1292 }
1293
1294 static const struct tty_operations rs_ops = {
1295         .open = rs_open,
1296         .close = rs_close,
1297         .write = rs_write,
1298         .flush_chars = rs_flush_chars,
1299         .write_room = rs_write_room,
1300         .chars_in_buffer = rs_chars_in_buffer,
1301         .flush_buffer = rs_flush_buffer,
1302         .ioctl = rs_ioctl,
1303         .throttle = rs_throttle,
1304         .unthrottle = rs_unthrottle,
1305         .set_termios = rs_set_termios,
1306         .stop = rs_stop,
1307         .start = rs_start,
1308         .hangup = rs_hangup,
1309         .set_ldisc = rs_set_ldisc,
1310 };
1311
1312 /* rs_init inits the driver */
1313 static int __init
1314 rs68328_init(void)
1315 {
1316         int flags, i;
1317         struct m68k_serial *info;
1318
1319         serial_driver = alloc_tty_driver(NR_PORTS);
1320         if (!serial_driver)
1321                 return -ENOMEM;
1322
1323         show_serial_version();
1324
1325         /* Initialize the tty_driver structure */
1326         /* SPARC: Not all of this is exactly right for us. */
1327
1328         serial_driver->name = "ttyS";
1329         serial_driver->major = TTY_MAJOR;
1330         serial_driver->minor_start = 64;
1331         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1332         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1333         serial_driver->init_termios = tty_std_termios;
1334         serial_driver->init_termios.c_cflag =
1335                         m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1336         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1337         tty_set_operations(serial_driver, &rs_ops);
1338
1339         if (tty_register_driver(serial_driver)) {
1340                 put_tty_driver(serial_driver);
1341                 printk(KERN_ERR "Couldn't register serial driver\n");
1342                 return -ENOMEM;
1343         }
1344
1345         local_irq_save(flags);
1346
1347         for(i=0;i<NR_PORTS;i++) {
1348
1349             info = &m68k_soft[i];
1350             info->magic = SERIAL_MAGIC;
1351             info->port = (int) &uart_addr[i];
1352             info->port.tty = NULL;
1353             info->irq = uart_irqs[i];
1354             info->custom_divisor = 16;
1355             info->close_delay = 50;
1356             info->closing_wait = 3000;
1357             info->x_char = 0;
1358             info->event = 0;
1359             info->count = 0;
1360             info->blocked_open = 0;
1361             INIT_WORK(&info->tqueue, do_softint);
1362             INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1363             init_waitqueue_head(&info->open_wait);
1364             init_waitqueue_head(&info->close_wait);
1365             info->line = i;
1366             info->is_cons = 1; /* Means shortcuts work */
1367
1368             printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1369                    info->port, info->irq);
1370             printk(" is a builtin MC68328 UART\n");
1371
1372 #ifdef CONFIG_M68VZ328
1373                 if (i > 0 )
1374                         PJSEL &= 0xCF;  /* PSW enable second port output */
1375 #endif
1376
1377             if (request_irq(uart_irqs[i],
1378                             rs_interrupt,
1379                             IRQF_DISABLED,
1380                             "M68328_UART", info))
1381                 panic("Unable to attach 68328 serial interrupt\n");
1382         }
1383         local_irq_restore(flags);
1384         return 0;
1385 }
1386
1387 module_init(rs68328_init);
1388
1389
1390
1391 static void m68328_set_baud(void)
1392 {
1393         unsigned short ustcnt;
1394         int     i;
1395
1396         ustcnt = USTCNT;
1397         USTCNT = ustcnt & ~USTCNT_TXEN;
1398
1399 again:
1400         for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1401                 if (baud_table[i] == m68328_console_baud)
1402                         break;
1403         if (i >= ARRAY_SIZE(baud_table)) {
1404                 m68328_console_baud = 9600;
1405                 goto again;
1406         }
1407
1408         UBAUD = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
1409                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1410         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1411         ustcnt |= USTCNT_8_7;
1412         ustcnt |= USTCNT_TXEN;
1413         USTCNT = ustcnt;
1414         m68328_console_initted = 1;
1415         return;
1416 }
1417
1418
1419 int m68328_console_setup(struct console *cp, char *arg)
1420 {
1421         int             i, n = CONSOLE_BAUD_RATE;
1422
1423         if (!cp)
1424                 return(-1);
1425
1426         if (arg)
1427                 n = simple_strtoul(arg,NULL,0);
1428
1429         for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1430                 if (baud_table[i] == n)
1431                         break;
1432         if (i < ARRAY_SIZE(baud_table)) {
1433                 m68328_console_baud = n;
1434                 m68328_console_cbaud = 0;
1435                 if (i > 15) {
1436                         m68328_console_cbaud |= CBAUDEX;
1437                         i -= 15;
1438                 }
1439                 m68328_console_cbaud |= i;
1440         }
1441
1442         m68328_set_baud(); /* make sure baud rate changes */
1443         return(0);
1444 }
1445
1446
1447 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1448 {
1449         *index = c->index;
1450         return serial_driver;
1451 }
1452
1453
1454 void m68328_console_write (struct console *co, const char *str,
1455                            unsigned int count)
1456 {
1457         if (!m68328_console_initted)
1458                 m68328_set_baud();
1459     while (count--) {
1460         if (*str == '\n')
1461            rs_put_char('\r');
1462         rs_put_char( *str++ );
1463     }
1464 }
1465
1466
1467 static struct console m68328_driver = {
1468         .name           = "ttyS",
1469         .write          = m68328_console_write,
1470         .device         = m68328_console_device,
1471         .setup          = m68328_console_setup,
1472         .flags          = CON_PRINTBUFFER,
1473         .index          = -1,
1474 };
1475
1476
1477 static int __init m68328_console_init(void)
1478 {
1479         register_console(&m68328_driver);
1480         return 0;
1481 }
1482
1483 console_initcall(m68328_console_init);