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 #ifdef CONFIG_CONSOLE
  82 extern wait_queue_head_t keypress_wait;
  83 #endif
  84
  85 struct tty_driver *serial_driver;
  86
  87 /* number of characters left in xmit buffer before we ask for more */
  88 #define WAKEUP_CHARS 256
  89
  90 /* Debugging... DEBUG_INTR is bad to use when one of the zs
  91  * lines is your console ;(
  92  */
  93 #undef SERIAL_DEBUG_INTR
  94 #undef SERIAL_DEBUG_OPEN
  95 #undef SERIAL_DEBUG_FLOW
  96
  97 #define RS_ISR_PASS_LIMIT 256
  98
  99 static void change_speed(struct m68k_serial *info);
 100
 101 /*
 102  *      Setup for console. Argument comes from the boot command line.
 103  */
 104
 105 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
 106 #define CONSOLE_BAUD_RATE       115200
 107 #define DEFAULT_CBAUD           B115200
 108 #else
 109         /* (es) */
 110         /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
 111         #ifdef CONFIG_M68VZ328
 112         #define CONSOLE_BAUD_RATE       19200
 113         #define DEFAULT_CBAUD           B19200
 114         #endif
 115         /* (/es) */
 116 #endif
 117
 118 #ifndef CONSOLE_BAUD_RATE
 119 #define CONSOLE_BAUD_RATE       9600
 120 #define DEFAULT_CBAUD           B9600
 121 #endif
 122
 123
 124 static int m68328_console_initted = 0;
 125 static int m68328_console_baud    = CONSOLE_BAUD_RATE;
 126 static int m68328_console_cbaud   = DEFAULT_CBAUD;
 127
 128
 129 static inline int serial_paranoia_check(struct m68k_serial *info,
 130                                         char *name, const char *routine)
 131 {
 132 #ifdef SERIAL_PARANOIA_CHECK
 133         static const char *badmagic =
 134                 "Warning: bad magic number for serial struct %s in %s\n";
 135         static const char *badinfo =
 136                 "Warning: null m68k_serial for %s in %s\n";
 137
 138         if (!info) {
 139                 printk(badinfo, name, routine);
 140                 return 1;
 141         }
 142         if (info->magic != SERIAL_MAGIC) {
 143                 printk(badmagic, name, routine);
 144                 return 1;
 145         }
 146 #endif
 147         return 0;
 148 }
 149
 150 /*
 151  * This is used to figure out the divisor speeds and the timeouts
 152  */
 153 static int baud_table[] = {
 154         0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
 155         9600, 19200, 38400, 57600, 115200, 0 };
 156
 157 /* Sets or clears DTR/RTS on the requested line */
 158 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
 159 {
 160         if (set) {
 161                 /* set the RTS/CTS line */
 162         } else {
 163                 /* clear it */
 164         }
 165         return;
 166 }
 167
 168 /* Utility routines */
 169 static inline int get_baud(struct m68k_serial *ss)
 170 {
 171         unsigned long result = 115200;
 172         unsigned short int baud = uart_addr[ss->line].ubaud;
 173         if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
 174         result >>= GET_FIELD(baud, UBAUD_DIVIDE);
 175
 176         return result;
 177 }
 178
 179 /*
 180  * ------------------------------------------------------------
 181  * rs_stop() and rs_start()
 182  *
 183  * This routines are called before setting or resetting tty->stopped.
 184  * They enable or disable transmitter interrupts, as necessary.
 185  * ------------------------------------------------------------
 186  */
 187 static void rs_stop(struct tty_struct *tty)
 188 {
 189         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 190         m68328_uart *uart = &uart_addr[info->line];
 191         unsigned long flags;
 192
 193         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 194                 return;
 195
 196         local_irq_save(flags);
 197         uart->ustcnt &= ~USTCNT_TXEN;
 198         local_irq_restore(flags);
 199 }
 200
 201 static int rs_put_char(char ch)
 202 {
 203         int flags, loops = 0;
 204
 205         local_irq_save(flags);
 206
 207         while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
 208                 loops++;
 209                 udelay(5);
 210         }
 211
 212         UTX_TXDATA = ch;
 213         udelay(5);
 214         local_irq_restore(flags);
 215         return 1;
 216 }
 217
 218 static void rs_start(struct tty_struct *tty)
 219 {
 220         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 221         m68328_uart *uart = &uart_addr[info->line];
 222         unsigned long flags;
 223
 224         if (serial_paranoia_check(info, tty->name, "rs_start"))
 225                 return;
 226
 227         local_irq_save(flags);
 228         if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
 229 #ifdef USE_INTS
 230                 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 231 #else
 232                 uart->ustcnt |= USTCNT_TXEN;
 233 #endif
 234         }
 235         local_irq_restore(flags);
 236 }
 237
 238 /* Drop into either the boot monitor or kadb upon receiving a break
 239  * from keyboard/console input.
 240  */
 241 static void batten_down_hatches(void)
 242 {
 243         /* Drop into the debugger */
 244 }
 245
 246 static void status_handle(struct m68k_serial *info, unsigned short status)
 247 {
 248 #if 0
 249         if(status & DCD) {
 250                 if((info->port.tty->termios->c_cflag & CRTSCTS) &&
 251                    ((info->curregs[3] & AUTO_ENAB)==0)) {
 252                         info->curregs[3] |= AUTO_ENAB;
 253                         info->pendregs[3] |= AUTO_ENAB;
 254                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 255                 }
 256         } else {
 257                 if((info->curregs[3] & AUTO_ENAB)) {
 258                         info->curregs[3] &= ~AUTO_ENAB;
 259                         info->pendregs[3] &= ~AUTO_ENAB;
 260                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 261                 }
 262         }
 263 #endif
 264         /* If this is console input and this is a
 265          * 'break asserted' status change interrupt
 266          * see if we can drop into the debugger
 267          */
 268         if((status & URX_BREAK) && info->break_abort)
 269                 batten_down_hatches();
 270         return;
 271 }
 272
 273 static void receive_chars(struct m68k_serial *info, unsigned short rx)
 274 {
 275         struct tty_struct *tty = info->port.tty;
 276         m68328_uart *uart = &uart_addr[info->line];
 277         unsigned char ch, flag;
 278
 279         /*
 280          * This do { } while() loop will get ALL chars out of Rx FIFO
 281          */
 282 #ifndef CONFIG_XCOPILOT_BUGS
 283         do {
 284 #endif
 285                 ch = GET_FIELD(rx, URX_RXDATA);
 286
 287                 if(info->is_cons) {
 288                         if(URX_BREAK & rx) { /* whee, break received */
 289                                 status_handle(info, rx);
 290                                 return;
 291 #ifdef CONFIG_MAGIC_SYSRQ
 292                         } else if (ch == 0x10) { /* ^P */
 293                                 show_state();
 294                                 show_free_areas();
 295                                 show_buffers();
 296 /*                              show_net_buffers(); */
 297                                 return;
 298                         } else if (ch == 0x12) { /* ^R */
 299                                 emergency_restart();
 300                                 return;
 301 #endif /* CONFIG_MAGIC_SYSRQ */
 302                         }
 303                         /* It is a 'keyboard interrupt' ;-) */
 304 #ifdef CONFIG_CONSOLE
 305                         wake_up(&keypress_wait);
 306 #endif
 307                 }
 308
 309                 if(!tty)
 310                         goto clear_and_exit;
 311
 312                 flag = TTY_NORMAL;
 313
 314                 if(rx & URX_PARITY_ERROR) {
 315                         flag = TTY_PARITY;
 316                         status_handle(info, rx);
 317                 } else if(rx & URX_OVRUN) {
 318                         flag = TTY_OVERRUN;
 319                         status_handle(info, rx);
 320                 } else if(rx & URX_FRAME_ERROR) {
 321                         flag = TTY_FRAME;
 322                         status_handle(info, rx);
 323                 }
 324                 tty_insert_flip_char(tty, ch, flag);
 325 #ifndef CONFIG_XCOPILOT_BUGS
 326         } while((rx = uart->urx.w) & URX_DATA_READY);
 327 #endif
 328
 329         tty_schedule_flip(tty);
 330
 331 clear_and_exit:
 332         return;
 333 }
 334
 335 static void transmit_chars(struct m68k_serial *info)
 336 {
 337         m68328_uart *uart = &uart_addr[info->line];
 338
 339         if (info->x_char) {
 340                 /* Send next char */
 341                 uart->utx.b.txdata = info->x_char;
 342                 info->x_char = 0;
 343                 goto clear_and_return;
 344         }
 345
 346         if((info->xmit_cnt <= 0) || info->port.tty->stopped) {
 347                 /* That's peculiar... TX ints off */
 348                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 349                 goto clear_and_return;
 350         }
 351
 352         /* Send char */
 353         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 354         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 355         info->xmit_cnt--;
 356
 357         if (info->xmit_cnt < WAKEUP_CHARS)
 358                 schedule_work(&info->tqueue);
 359
 360         if(info->xmit_cnt <= 0) {
 361                 /* All done for now... TX ints off */
 362                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 363                 goto clear_and_return;
 364         }
 365
 366 clear_and_return:
 367         /* Clear interrupt (should be auto)*/
 368         return;
 369 }
 370
 371 /*
 372  * This is the serial driver's generic interrupt routine
 373  */
 374 irqreturn_t rs_interrupt(int irq, void *dev_id)
 375 {
 376         struct m68k_serial *info = dev_id;
 377         m68328_uart *uart;
 378         unsigned short rx;
 379         unsigned short tx;
 380
 381         uart = &uart_addr[info->line];
 382         rx = uart->urx.w;
 383
 384 #ifdef USE_INTS
 385         tx = uart->utx.w;
 386
 387         if (rx & URX_DATA_READY) receive_chars(info, rx);
 388         if (tx & UTX_TX_AVAIL)   transmit_chars(info);
 389 #else
 390         receive_chars(info, rx);
 391 #endif
 392         return IRQ_HANDLED;
 393 }
 394
 395 static void do_softint(struct work_struct *work)
 396 {
 397         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue);
 398         struct tty_struct       *tty;
 399
 400         tty = info->port.tty;
 401         if (!tty)
 402                 return;
 403 #if 0
 404         if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
 405                 tty_wakeup(tty);
 406         }
 407 #endif
 408 }
 409
 410 /*
 411  * This routine is called from the scheduler tqueue when the interrupt
 412  * routine has signalled that a hangup has occurred.  The path of
 413  * hangup processing is:
 414  *
 415  *      serial interrupt routine -> (scheduler tqueue) ->
 416  *      do_serial_hangup() -> tty->hangup() -> rs_hangup()
 417  *
 418  */
 419 static void do_serial_hangup(struct work_struct *work)
 420 {
 421         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue_hangup);
 422         struct tty_struct       *tty;
 423
 424         tty = info->port.tty;
 425         if (!tty)
 426                 return;
 427
 428         tty_hangup(tty);
 429 }
 430
 431
 432 static int startup(struct m68k_serial * info)
 433 {
 434         m68328_uart *uart = &uart_addr[info->line];
 435         unsigned long flags;
 436
 437         if (info->flags & S_INITIALIZED)
 438                 return 0;
 439
 440         if (!info->xmit_buf) {
 441                 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
 442                 if (!info->xmit_buf)
 443                         return -ENOMEM;
 444         }
 445
 446         local_irq_save(flags);
 447
 448         /*
 449          * Clear the FIFO buffers and disable them
 450          * (they will be reenabled in change_speed())
 451          */
 452
 453         uart->ustcnt = USTCNT_UEN;
 454         info->xmit_fifo_size = 1;
 455         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
 456         (void)uart->urx.w;
 457
 458         /*
 459          * Finally, enable sequencing and interrupts
 460          */
 461 #ifdef USE_INTS
 462         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
 463                  USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
 464 #else
 465         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
 466 #endif
 467
 468         if (info->port.tty)
 469                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
 470         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 471
 472         /*
 473          * and set the speed of the serial port
 474          */
 475
 476         change_speed(info);
 477
 478         info->flags |= S_INITIALIZED;
 479         local_irq_restore(flags);
 480         return 0;
 481 }
 482
 483 /*
 484  * This routine will shutdown a serial port; interrupts are disabled, and
 485  * DTR is dropped if the hangup on close termio flag is on.
 486  */
 487 static void shutdown(struct m68k_serial * info)
 488 {
 489         m68328_uart *uart = &uart_addr[info->line];
 490         unsigned long   flags;
 491
 492         uart->ustcnt = 0; /* All off! */
 493         if (!(info->flags & S_INITIALIZED))
 494                 return;
 495
 496         local_irq_save(flags);
 497
 498         if (info->xmit_buf) {
 499                 free_page((unsigned long) info->xmit_buf);
 500                 info->xmit_buf = 0;
 501         }
 502
 503         if (info->port.tty)
 504                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 505
 506         info->flags &= ~S_INITIALIZED;
 507         local_irq_restore(flags);
 508 }
 509
 510 struct {
 511         int divisor, prescale;
 512 }
 513 #ifndef CONFIG_M68VZ328
 514  hw_baud_table[18] = {
 515         {0,0}, /* 0 */
 516         {0,0}, /* 50 */
 517         {0,0}, /* 75 */
 518         {0,0}, /* 110 */
 519         {0,0}, /* 134 */
 520         {0,0}, /* 150 */
 521         {0,0}, /* 200 */
 522         {7,0x26}, /* 300 */
 523         {6,0x26}, /* 600 */
 524         {5,0x26}, /* 1200 */
 525         {0,0}, /* 1800 */
 526         {4,0x26}, /* 2400 */
 527         {3,0x26}, /* 4800 */
 528         {2,0x26}, /* 9600 */
 529         {1,0x26}, /* 19200 */
 530         {0,0x26}, /* 38400 */
 531         {1,0x38}, /* 57600 */
 532         {0,0x38}, /* 115200 */
 533 };
 534 #else
 535  hw_baud_table[18] = {
 536                  {0,0}, /* 0 */
 537                  {0,0}, /* 50 */
 538                  {0,0}, /* 75 */
 539                  {0,0}, /* 110 */
 540                  {0,0}, /* 134 */
 541                  {0,0}, /* 150 */
 542                  {0,0}, /* 200 */
 543                  {0,0}, /* 300 */
 544                  {7,0x26}, /* 600 */
 545                  {6,0x26}, /* 1200 */
 546                  {0,0}, /* 1800 */
 547                  {5,0x26}, /* 2400 */
 548                  {4,0x26}, /* 4800 */
 549                  {3,0x26}, /* 9600 */
 550                  {2,0x26}, /* 19200 */
 551                  {1,0x26}, /* 38400 */
 552                  {0,0x26}, /* 57600 */
 553                  {1,0x38}, /* 115200 */
 554 };
 555 #endif
 556 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
 557
 558 /*
 559  * This routine is called to set the UART divisor registers to match
 560  * the specified baud rate for a serial port.
 561  */
 562 static void change_speed(struct m68k_serial *info)
 563 {
 564         m68328_uart *uart = &uart_addr[info->line];
 565         unsigned short port;
 566         unsigned short ustcnt;
 567         unsigned cflag;
 568         int     i;
 569
 570         if (!info->port.tty || !info->port.tty->termios)
 571                 return;
 572         cflag = info->port.tty->termios->c_cflag;
 573         if (!(port = info->port))
 574                 return;
 575
 576         ustcnt = uart->ustcnt;
 577         uart->ustcnt = ustcnt & ~USTCNT_TXEN;
 578
 579         i = cflag & CBAUD;
 580         if (i & CBAUDEX) {
 581                 i = (i & ~CBAUDEX) + B38400;
 582         }
 583
 584         info->baud = baud_table[i];
 585         uart->ubaud = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
 586                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
 587
 588         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
 589
 590         if ((cflag & CSIZE) == CS8)
 591                 ustcnt |= USTCNT_8_7;
 592
 593         if (cflag & CSTOPB)
 594                 ustcnt |= USTCNT_STOP;
 595
 596         if (cflag & PARENB)
 597                 ustcnt |= USTCNT_PARITYEN;
 598         if (cflag & PARODD)
 599                 ustcnt |= USTCNT_ODD_EVEN;
 600
 601 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 602         if (cflag & CRTSCTS) {
 603                 uart->utx.w &= ~ UTX_NOCTS;
 604         } else {
 605                 uart->utx.w |= UTX_NOCTS;
 606         }
 607 #endif
 608
 609         ustcnt |= USTCNT_TXEN;
 610
 611         uart->ustcnt = ustcnt;
 612         return;
 613 }
 614
 615 /*
 616  * Fair output driver allows a process to speak.
 617  */
 618 static void rs_fair_output(void)
 619 {
 620         int left;               /* Output no more than that */
 621         unsigned long flags;
 622         struct m68k_serial *info = &m68k_soft[0];
 623         char c;
 624
 625         if (info == 0) return;
 626         if (info->xmit_buf == 0) return;
 627
 628         local_irq_save(flags);
 629         left = info->xmit_cnt;
 630         while (left != 0) {
 631                 c = info->xmit_buf[info->xmit_tail];
 632                 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
 633                 info->xmit_cnt--;
 634                 local_irq_restore(flags);
 635
 636                 rs_put_char(c);
 637
 638                 local_irq_save(flags);
 639                 left = min(info->xmit_cnt, left-1);
 640         }
 641
 642         /* Last character is being transmitted now (hopefully). */
 643         udelay(5);
 644
 645         local_irq_restore(flags);
 646         return;
 647 }
 648
 649 /*
 650  * m68k_console_print is registered for printk.
 651  */
 652 void console_print_68328(const char *p)
 653 {
 654         char c;
 655
 656         while((c=*(p++)) != 0) {
 657                 if(c == '\n')
 658                         rs_put_char('\r');
 659                 rs_put_char(c);
 660         }
 661
 662         /* Comment this if you want to have a strict interrupt-driven output */
 663         rs_fair_output();
 664
 665         return;
 666 }
 667
 668 static void rs_set_ldisc(struct tty_struct *tty)
 669 {
 670         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 671
 672         if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
 673                 return;
 674
 675         info->is_cons = (tty->termios->c_line == N_TTY);
 676
 677         printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
 678 }
 679
 680 static void rs_flush_chars(struct tty_struct *tty)
 681 {
 682         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 683         m68328_uart *uart = &uart_addr[info->line];
 684         unsigned long flags;
 685
 686         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 687                 return;
 688 #ifndef USE_INTS
 689         for(;;) {
 690 #endif
 691
 692         /* Enable transmitter */
 693         local_irq_save(flags);
 694
 695         if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
 696                         !info->xmit_buf) {
 697                 local_irq_restore(flags);
 698                 return;
 699         }
 700
 701 #ifdef USE_INTS
 702         uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 703 #else
 704         uart->ustcnt |= USTCNT_TXEN;
 705 #endif
 706
 707 #ifdef USE_INTS
 708         if (uart->utx.w & UTX_TX_AVAIL) {
 709 #else
 710         if (1) {
 711 #endif
 712                 /* Send char */
 713                 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 714                 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 715                 info->xmit_cnt--;
 716         }
 717
 718 #ifndef USE_INTS
 719         while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 720         }
 721 #endif
 722         local_irq_restore(flags);
 723 }
 724
 725 extern void console_printn(const char * b, int count);
 726
 727 static int rs_write(struct tty_struct * tty,
 728                     const unsigned char *buf, int count)
 729 {
 730         int     c, total = 0;
 731         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 732         m68328_uart *uart = &uart_addr[info->line];
 733         unsigned long flags;
 734
 735         if (serial_paranoia_check(info, tty->name, "rs_write"))
 736                 return 0;
 737
 738         if (!tty || !info->xmit_buf)
 739                 return 0;
 740
 741         local_save_flags(flags);
 742         while (1) {
 743                 local_irq_disable();
 744                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
 745                                    SERIAL_XMIT_SIZE - info->xmit_head));
 746                 local_irq_restore(flags);
 747
 748                 if (c <= 0)
 749                         break;
 750
 751                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
 752
 753                 local_irq_disable();
 754                 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
 755                 info->xmit_cnt += c;
 756                 local_irq_restore(flags);
 757                 buf += c;
 758                 count -= c;
 759                 total += c;
 760         }
 761
 762         if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
 763                 /* Enable transmitter */
 764                 local_irq_disable();
 765 #ifndef USE_INTS
 766                 while(info->xmit_cnt) {
 767 #endif
 768
 769                 uart->ustcnt |= USTCNT_TXEN;
 770 #ifdef USE_INTS
 771                 uart->ustcnt |= USTCNT_TX_INTR_MASK;
 772 #else
 773                 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 774 #endif
 775                 if (uart->utx.w & UTX_TX_AVAIL) {
 776                         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 777                         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 778                         info->xmit_cnt--;
 779                 }
 780
 781 #ifndef USE_INTS
 782                 }
 783 #endif
 784                 local_irq_restore(flags);
 785         }
 786
 787         return total;
 788 }
 789
 790 static int rs_write_room(struct tty_struct *tty)
 791 {
 792         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 793         int     ret;
 794
 795         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 796                 return 0;
 797         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
 798         if (ret < 0)
 799                 ret = 0;
 800         return ret;
 801 }
 802
 803 static int rs_chars_in_buffer(struct tty_struct *tty)
 804 {
 805         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 806
 807         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 808                 return 0;
 809         return info->xmit_cnt;
 810 }
 811
 812 static void rs_flush_buffer(struct tty_struct *tty)
 813 {
 814         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 815         unsigned long flags;
 816
 817         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 818                 return;
 819         local_irq_save(flags);
 820         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 821         local_irq_restore(flags);
 822         tty_wakeup(tty);
 823 }
 824
 825 /*
 826  * ------------------------------------------------------------
 827  * rs_throttle()
 828  *
 829  * This routine is called by the upper-layer tty layer to signal that
 830  * incoming characters should be throttled.
 831  * ------------------------------------------------------------
 832  */
 833 static void rs_throttle(struct tty_struct * tty)
 834 {
 835         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 836
 837         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 838                 return;
 839
 840         if (I_IXOFF(tty))
 841                 info->x_char = STOP_CHAR(tty);
 842
 843         /* Turn off RTS line (do this atomic) */
 844 }
 845
 846 static void rs_unthrottle(struct tty_struct * tty)
 847 {
 848         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 849
 850         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
 851                 return;
 852
 853         if (I_IXOFF(tty)) {
 854                 if (info->x_char)
 855                         info->x_char = 0;
 856                 else
 857                         info->x_char = START_CHAR(tty);
 858         }
 859
 860         /* Assert RTS line (do this atomic) */
 861 }
 862
 863 /*
 864  * ------------------------------------------------------------
 865  * rs_ioctl() and friends
 866  * ------------------------------------------------------------
 867  */
 868
 869 static int get_serial_info(struct m68k_serial * info,
 870                            struct serial_struct * retinfo)
 871 {
 872         struct serial_struct tmp;
 873
 874         if (!retinfo)
 875                 return -EFAULT;
 876         memset(&tmp, 0, sizeof(tmp));
 877         tmp.type = info->type;
 878         tmp.line = info->line;
 879         tmp.port = info->port;
 880         tmp.irq = info->irq;
 881         tmp.flags = info->flags;
 882         tmp.baud_base = info->baud_base;
 883         tmp.close_delay = info->close_delay;
 884         tmp.closing_wait = info->closing_wait;
 885         tmp.custom_divisor = info->custom_divisor;
 886         copy_to_user(retinfo,&tmp,sizeof(*retinfo));
 887         return 0;
 888 }
 889
 890 static int set_serial_info(struct m68k_serial * info,
 891                            struct serial_struct * new_info)
 892 {
 893         struct serial_struct new_serial;
 894         struct m68k_serial old_info;
 895         int                     retval = 0;
 896
 897         if (!new_info)
 898                 return -EFAULT;
 899         copy_from_user(&new_serial,new_info,sizeof(new_serial));
 900         old_info = *info;
 901
 902         if (!capable(CAP_SYS_ADMIN)) {
 903                 if ((new_serial.baud_base != info->baud_base) ||
 904                     (new_serial.type != info->type) ||
 905                     (new_serial.close_delay != info->close_delay) ||
 906                     ((new_serial.flags & ~S_USR_MASK) !=
 907                      (info->flags & ~S_USR_MASK)))
 908                         return -EPERM;
 909                 info->flags = ((info->flags & ~S_USR_MASK) |
 910                                (new_serial.flags & S_USR_MASK));
 911                 info->custom_divisor = new_serial.custom_divisor;
 912                 goto check_and_exit;
 913         }
 914
 915         if (info->count > 1)
 916                 return -EBUSY;
 917
 918         /*
 919          * OK, past this point, all the error checking has been done.
 920          * At this point, we start making changes.....
 921          */
 922
 923         info->baud_base = new_serial.baud_base;
 924         info->flags = ((info->flags & ~S_FLAGS) |
 925                         (new_serial.flags & S_FLAGS));
 926         info->type = new_serial.type;
 927         info->close_delay = new_serial.close_delay;
 928         info->closing_wait = new_serial.closing_wait;
 929
 930 check_and_exit:
 931         retval = startup(info);
 932         return retval;
 933 }
 934
 935 /*
 936  * get_lsr_info - get line status register info
 937  *
 938  * Purpose: Let user call ioctl() to get info when the UART physically
 939  *          is emptied.  On bus types like RS485, the transmitter must
 940  *          release the bus after transmitting. This must be done when
 941  *          the transmit shift register is empty, not be done when the
 942  *          transmit holding register is empty.  This functionality
 943  *          allows an RS485 driver to be written in user space.
 944  */
 945 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
 946 {
 947 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 948         m68328_uart *uart = &uart_addr[info->line];
 949 #endif
 950         unsigned char status;
 951         unsigned long flags;
 952
 953         local_irq_save(flags);
 954 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 955         status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
 956 #else
 957         status = 0;
 958 #endif
 959         local_irq_restore(flags);
 960         put_user(status,value);
 961         return 0;
 962 }
 963
 964 /*
 965  * This routine sends a break character out the serial port.
 966  */
 967 static void send_break(struct m68k_serial * info, unsigned int duration)
 968 {
 969         m68328_uart *uart = &uart_addr[info->line];
 970         unsigned long flags;
 971         if (!info->port)
 972                 return;
 973         local_irq_save(flags);
 974 #ifdef USE_INTS
 975         uart->utx.w |= UTX_SEND_BREAK;
 976         msleep_interruptible(duration);
 977         uart->utx.w &= ~UTX_SEND_BREAK;
 978 #endif
 979         local_irq_restore(flags);
 980 }
 981
 982 static int rs_ioctl(struct tty_struct *tty, struct file * file,
 983                     unsigned int cmd, unsigned long arg)
 984 {
 985         int error;
 986         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
 987         int retval;
 988
 989         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
 990                 return -ENODEV;
 991
 992         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 993             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
 994             (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
 995                 if (tty->flags & (1 << TTY_IO_ERROR))
 996                     return -EIO;
 997         }
 998
 999         switch (cmd) {
1000                 case TCSBRK:    /* SVID version: non-zero arg --> no break */
1001                         retval = tty_check_change(tty);
1002                         if (retval)
1003                                 return retval;
1004                         tty_wait_until_sent(tty, 0);
1005                         if (!arg)
1006                                 send_break(info, 250);  /* 1/4 second */
1007                         return 0;
1008                 case TCSBRKP:   /* support for POSIX tcsendbreak() */
1009                         retval = tty_check_change(tty);
1010                         if (retval)
1011                                 return retval;
1012                         tty_wait_until_sent(tty, 0);
1013                         send_break(info, arg ? arg*(100) : 250);
1014                         return 0;
1015                 case TIOCGSERIAL:
1016                         if (access_ok(VERIFY_WRITE, (void *) arg,
1017                                                 sizeof(struct serial_struct)))
1018                                 return get_serial_info(info,
1019                                                (struct serial_struct *) arg);
1020                         return -EFAULT;
1021                 case TIOCSSERIAL:
1022                         return set_serial_info(info,
1023                                                (struct serial_struct *) arg);
1024                 case TIOCSERGETLSR: /* Get line status register */
1025                         if (access_ok(VERIFY_WRITE, (void *) arg,
1026                                                 sizeof(unsigned int)))
1027                                 return get_lsr_info(info, (unsigned int *) arg);
1028                         return -EFAULT;
1029                 case TIOCSERGSTRUCT:
1030                         if (!access_ok(VERIFY_WRITE, (void *) arg,
1031                                                 sizeof(struct m68k_serial)))
1032                                 return -EFAULT;
1033                         copy_to_user((struct m68k_serial *) arg,
1034                                     info, sizeof(struct m68k_serial));
1035                         return 0;
1036
1037                 default:
1038                         return -ENOIOCTLCMD;
1039                 }
1040         return 0;
1041 }
1042
1043 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1044 {
1045         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1046
1047         change_speed(info);
1048
1049         if ((old_termios->c_cflag & CRTSCTS) &&
1050             !(tty->termios->c_cflag & CRTSCTS)) {
1051                 tty->hw_stopped = 0;
1052                 rs_start(tty);
1053         }
1054
1055 }
1056
1057 /*
1058  * ------------------------------------------------------------
1059  * rs_close()
1060  *
1061  * This routine is called when the serial port gets closed.  First, we
1062  * wait for the last remaining data to be sent.  Then, we unlink its
1063  * S structure from the interrupt chain if necessary, and we free
1064  * that IRQ if nothing is left in the chain.
1065  * ------------------------------------------------------------
1066  */
1067 static void rs_close(struct tty_struct *tty, struct file * filp)
1068 {
1069         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1070         m68328_uart *uart = &uart_addr[info->line];
1071         unsigned long flags;
1072
1073         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1074                 return;
1075
1076         local_irq_save(flags);
1077
1078         if (tty_hung_up_p(filp)) {
1079                 local_irq_restore(flags);
1080                 return;
1081         }
1082
1083         if ((tty->count == 1) && (info->count != 1)) {
1084                 /*
1085                  * Uh, oh.  tty->count is 1, which means that the tty
1086                  * structure will be freed.  Info->count should always
1087                  * be one in these conditions.  If it's greater than
1088                  * one, we've got real problems, since it means the
1089                  * serial port won't be shutdown.
1090                  */
1091                 printk("rs_close: bad serial port count; tty->count is 1, "
1092                        "info->count is %d\n", info->count);
1093                 info->count = 1;
1094         }
1095         if (--info->count < 0) {
1096                 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1097                        info->line, info->count);
1098                 info->count = 0;
1099         }
1100         if (info->count) {
1101                 local_irq_restore(flags);
1102                 return;
1103         }
1104         info->flags |= S_CLOSING;
1105         /*
1106          * Now we wait for the transmit buffer to clear; and we notify
1107          * the line discipline to only process XON/XOFF characters.
1108          */
1109         tty->closing = 1;
1110         if (info->closing_wait != S_CLOSING_WAIT_NONE)
1111                 tty_wait_until_sent(tty, info->closing_wait);
1112         /*
1113          * At this point we stop accepting input.  To do this, we
1114          * disable the receive line status interrupts, and tell the
1115          * interrupt driver to stop checking the data ready bit in the
1116          * line status register.
1117          */
1118
1119         uart->ustcnt &= ~USTCNT_RXEN;
1120         uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1121
1122         shutdown(info);
1123         rs_flush_buffer(tty);
1124
1125         tty_ldisc_flush(tty);
1126         tty->closing = 0;
1127         info->event = 0;
1128         info->port.tty = NULL;
1129 #warning "This is not and has never been valid so fix it"
1130 #if 0
1131         if (tty->ldisc.num != ldiscs[N_TTY].num) {
1132                 if (tty->ldisc.close)
1133                         (tty->ldisc.close)(tty);
1134                 tty->ldisc = ldiscs[N_TTY];
1135                 tty->termios->c_line = N_TTY;
1136                 if (tty->ldisc.open)
1137                         (tty->ldisc.open)(tty);
1138         }
1139 #endif
1140         if (info->blocked_open) {
1141                 if (info->close_delay) {
1142                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1143                 }
1144                 wake_up_interruptible(&info->open_wait);
1145         }
1146         info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1147         wake_up_interruptible(&info->close_wait);
1148         local_irq_restore(flags);
1149 }
1150
1151 /*
1152  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1153  */
1154 void rs_hangup(struct tty_struct *tty)
1155 {
1156         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1157
1158         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1159                 return;
1160
1161         rs_flush_buffer(tty);
1162         shutdown(info);
1163         info->event = 0;
1164         info->count = 0;
1165         info->flags &= ~S_NORMAL_ACTIVE;
1166         info->port.tty = NULL;
1167         wake_up_interruptible(&info->open_wait);
1168 }
1169
1170 /*
1171  * ------------------------------------------------------------
1172  * rs_open() and friends
1173  * ------------------------------------------------------------
1174  */
1175 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1176                            struct m68k_serial *info)
1177 {
1178         DECLARE_WAITQUEUE(wait, current);
1179         int             retval;
1180         int             do_clocal = 0;
1181
1182         /*
1183          * If the device is in the middle of being closed, then block
1184          * until it's done, and then try again.
1185          */
1186         if (info->flags & S_CLOSING) {
1187                 interruptible_sleep_on(&info->close_wait);
1188 #ifdef SERIAL_DO_RESTART
1189                 if (info->flags & S_HUP_NOTIFY)
1190                         return -EAGAIN;
1191                 else
1192                         return -ERESTARTSYS;
1193 #else
1194                 return -EAGAIN;
1195 #endif
1196         }
1197
1198         /*
1199          * If non-blocking mode is set, or the port is not enabled,
1200          * then make the check up front and then exit.
1201          */
1202         if ((filp->f_flags & O_NONBLOCK) ||
1203             (tty->flags & (1 << TTY_IO_ERROR))) {
1204                 info->flags |= S_NORMAL_ACTIVE;
1205                 return 0;
1206         }
1207
1208         if (tty->termios->c_cflag & CLOCAL)
1209                 do_clocal = 1;
1210
1211         /*
1212          * Block waiting for the carrier detect and the line to become
1213          * free (i.e., not in use by the callout).  While we are in
1214          * this loop, info->count is dropped by one, so that
1215          * rs_close() knows when to free things.  We restore it upon
1216          * exit, either normal or abnormal.
1217          */
1218         retval = 0;
1219         add_wait_queue(&info->open_wait, &wait);
1220
1221         info->count--;
1222         info->blocked_open++;
1223         while (1) {
1224                 local_irq_disable();
1225                 m68k_rtsdtr(info, 1);
1226                 local_irq_enable();
1227                 current->state = TASK_INTERRUPTIBLE;
1228                 if (tty_hung_up_p(filp) ||
1229                     !(info->flags & S_INITIALIZED)) {
1230 #ifdef SERIAL_DO_RESTART
1231                         if (info->flags & S_HUP_NOTIFY)
1232                                 retval = -EAGAIN;
1233                         else
1234                                 retval = -ERESTARTSYS;
1235 #else
1236                         retval = -EAGAIN;
1237 #endif
1238                         break;
1239                 }
1240                 if (!(info->flags & S_CLOSING) && do_clocal)
1241                         break;
1242                 if (signal_pending(current)) {
1243                         retval = -ERESTARTSYS;
1244                         break;
1245                 }
1246                 schedule();
1247         }
1248         current->state = TASK_RUNNING;
1249         remove_wait_queue(&info->open_wait, &wait);
1250         if (!tty_hung_up_p(filp))
1251                 info->count++;
1252         info->blocked_open--;
1253
1254         if (retval)
1255                 return retval;
1256         info->flags |= S_NORMAL_ACTIVE;
1257         return 0;
1258 }
1259
1260 /*
1261  * This routine is called whenever a serial port is opened.  It
1262  * enables interrupts for a serial port, linking in its S structure into
1263  * the IRQ chain.   It also performs the serial-specific
1264  * initialization for the tty structure.
1265  */
1266 int rs_open(struct tty_struct *tty, struct file * filp)
1267 {
1268         struct m68k_serial      *info;
1269         int                     retval, line;
1270
1271         line = tty->index;
1272
1273         if (line >= NR_PORTS || line < 0) /* we have exactly one */
1274                 return -ENODEV;
1275
1276         info = &m68k_soft[line];
1277
1278         if (serial_paranoia_check(info, tty->name, "rs_open"))
1279                 return -ENODEV;
1280
1281         info->count++;
1282         tty->driver_data = info;
1283         info->port.tty = tty;
1284
1285         /*
1286          * Start up serial port
1287          */
1288         retval = startup(info);
1289         if (retval)
1290                 return retval;
1291
1292         return block_til_ready(tty, filp, info);
1293 }
1294
1295 /* Finally, routines used to initialize the serial driver. */
1296
1297 static void show_serial_version(void)
1298 {
1299         printk("MC68328 serial driver version 1.00\n");
1300 }
1301
1302 static const struct tty_operations rs_ops = {
1303         .open = rs_open,
1304         .close = rs_close,
1305         .write = rs_write,
1306         .flush_chars = rs_flush_chars,
1307         .write_room = rs_write_room,
1308         .chars_in_buffer = rs_chars_in_buffer,
1309         .flush_buffer = rs_flush_buffer,
1310         .ioctl = rs_ioctl,
1311         .throttle = rs_throttle,
1312         .unthrottle = rs_unthrottle,
1313         .set_termios = rs_set_termios,
1314         .stop = rs_stop,
1315         .start = rs_start,
1316         .hangup = rs_hangup,
1317         .set_ldisc = rs_set_ldisc,
1318 };
1319
1320 /* rs_init inits the driver */
1321 static int __init
1322 rs68328_init(void)
1323 {
1324         int flags, i;
1325         struct m68k_serial *info;
1326
1327         serial_driver = alloc_tty_driver(NR_PORTS);
1328         if (!serial_driver)
1329                 return -ENOMEM;
1330
1331         show_serial_version();
1332
1333         /* Initialize the tty_driver structure */
1334         /* SPARC: Not all of this is exactly right for us. */
1335
1336         serial_driver->name = "ttyS";
1337         serial_driver->major = TTY_MAJOR;
1338         serial_driver->minor_start = 64;
1339         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1340         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1341         serial_driver->init_termios = tty_std_termios;
1342         serial_driver->init_termios.c_cflag =
1343                         m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1344         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1345         tty_set_operations(serial_driver, &rs_ops);
1346
1347         if (tty_register_driver(serial_driver)) {
1348                 put_tty_driver(serial_driver);
1349                 printk(KERN_ERR "Couldn't register serial driver\n");
1350                 return -ENOMEM;
1351         }
1352
1353         local_irq_save(flags);
1354
1355         for(i=0;i<NR_PORTS;i++) {
1356
1357             info = &m68k_soft[i];
1358             info->magic = SERIAL_MAGIC;
1359             info->port = (int) &uart_addr[i];
1360             info->port.tty = NULL;
1361             info->irq = uart_irqs[i];
1362             info->custom_divisor = 16;
1363             info->close_delay = 50;
1364             info->closing_wait = 3000;
1365             info->x_char = 0;
1366             info->event = 0;
1367             info->count = 0;
1368             info->blocked_open = 0;
1369             INIT_WORK(&info->tqueue, do_softint);
1370             INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1371             init_waitqueue_head(&info->open_wait);
1372             init_waitqueue_head(&info->close_wait);
1373             info->line = i;
1374             info->is_cons = 1; /* Means shortcuts work */
1375
1376             printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1377                    info->port, info->irq);
1378             printk(" is a builtin MC68328 UART\n");
1379
1380 #ifdef CONFIG_M68VZ328
1381                 if (i > 0 )
1382                         PJSEL &= 0xCF;  /* PSW enable second port output */
1383 #endif
1384
1385             if (request_irq(uart_irqs[i],
1386                             rs_interrupt,
1387                             IRQF_DISABLED,
1388                             "M68328_UART", info))
1389                 panic("Unable to attach 68328 serial interrupt\n");
1390         }
1391         local_irq_restore(flags);
1392         return 0;
1393 }
1394
1395 module_init(rs68328_init);
1396
1397
1398
1399 static void m68328_set_baud(void)
1400 {
1401         unsigned short ustcnt;
1402         int     i;
1403
1404         ustcnt = USTCNT;
1405         USTCNT = ustcnt & ~USTCNT_TXEN;
1406
1407 again:
1408         for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1409                 if (baud_table[i] == m68328_console_baud)
1410                         break;
1411         if (i >= ARRAY_SIZE(baud_table)) {
1412                 m68328_console_baud = 9600;
1413                 goto again;
1414         }
1415
1416         UBAUD = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
1417                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1418         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1419         ustcnt |= USTCNT_8_7;
1420         ustcnt |= USTCNT_TXEN;
1421         USTCNT = ustcnt;
1422         m68328_console_initted = 1;
1423         return;
1424 }
1425
1426
1427 int m68328_console_setup(struct console *cp, char *arg)
1428 {
1429         int             i, n = CONSOLE_BAUD_RATE;
1430
1431         if (!cp)
1432                 return(-1);
1433
1434         if (arg)
1435                 n = simple_strtoul(arg,NULL,0);
1436
1437         for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1438                 if (baud_table[i] == n)
1439                         break;
1440         if (i < ARRAY_SIZE(baud_table)) {
1441                 m68328_console_baud = n;
1442                 m68328_console_cbaud = 0;
1443                 if (i > 15) {
1444                         m68328_console_cbaud |= CBAUDEX;
1445                         i -= 15;
1446                 }
1447                 m68328_console_cbaud |= i;
1448         }
1449
1450         m68328_set_baud(); /* make sure baud rate changes */
1451         return(0);
1452 }
1453
1454
1455 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1456 {
1457         *index = c->index;
1458         return serial_driver;
1459 }
1460
1461
1462 void m68328_console_write (struct console *co, const char *str,
1463                            unsigned int count)
1464 {
1465         if (!m68328_console_initted)
1466                 m68328_set_baud();
1467     while (count--) {
1468         if (*str == '\n')
1469            rs_put_char('\r');
1470         rs_put_char( *str++ );
1471     }
1472 }
1473
1474
1475 static struct console m68328_driver = {
1476         .name           = "ttyS",
1477         .write          = m68328_console_write,
1478         .device         = m68328_console_device,
1479         .setup          = m68328_console_setup,
1480         .flags          = CON_PRINTBUFFER,
1481         .index          = -1,
1482 };
1483
1484
1485 static int __init m68328_console_init(void)
1486 {
1487         register_console(&m68328_driver);
1488         return 0;
1489 }
1490
1491 console_initcall(m68328_console_init);