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
  39 #include <asm/io.h>
  40 #include <asm/irq.h>
  41 #include <asm/system.h>
  42 #include <asm/delay.h>
  43 #include <asm/uaccess.h>
  44
  45 /* (es) */
  46 /* note: perhaps we can murge these files, so that you can just
  47  *       define 1 of them, and they can sort that out for themselves
  48  */
  49 #if defined(CONFIG_M68EZ328)
  50 #include <asm/MC68EZ328.h>
  51 #else
  52 #if defined(CONFIG_M68VZ328)
  53 #include <asm/MC68VZ328.h>
  54 #else
  55 #include <asm/MC68328.h>
  56 #endif /* CONFIG_M68VZ328 */
  57 #endif /* CONFIG_M68EZ328 */
  58
  59 #include "68328serial.h"
  60
  61 /* Turn off usage of real serial interrupt code, to "support" Copilot */
  62 #ifdef CONFIG_XCOPILOT_BUGS
  63 #undef USE_INTS
  64 #else
  65 #define USE_INTS
  66 #endif
  67
  68 static struct m68k_serial m68k_soft[NR_PORTS];
  69
  70 static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
  71
  72 /* multiple ports are contiguous in memory */
  73 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
  74
  75 struct tty_struct m68k_ttys;
  76 struct m68k_serial *m68k_consinfo = 0;
  77
  78 #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
  79
  80 #ifdef CONFIG_CONSOLE
  81 extern wait_queue_head_t keypress_wait;
  82 #endif
  83
  84 struct tty_driver *serial_driver;
  85
  86 /* number of characters left in xmit buffer before we ask for more */
  87 #define WAKEUP_CHARS 256
  88
  89 /* Debugging... DEBUG_INTR is bad to use when one of the zs
  90  * lines is your console ;(
  91  */
  92 #undef SERIAL_DEBUG_INTR
  93 #undef SERIAL_DEBUG_OPEN
  94 #undef SERIAL_DEBUG_FLOW
  95
  96 #define RS_ISR_PASS_LIMIT 256
  97
  98 static void change_speed(struct m68k_serial *info);
  99
 100 /*
 101  *      Setup for console. Argument comes from the boot command line.
 102  */
 103
 104 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
 105 #define CONSOLE_BAUD_RATE       115200
 106 #define DEFAULT_CBAUD           B115200
 107 #else
 108         /* (es) */
 109         /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
 110         #ifdef CONFIG_M68VZ328
 111         #define CONSOLE_BAUD_RATE       19200
 112         #define DEFAULT_CBAUD           B19200
 113         #endif
 114         /* (/es) */
 115 #endif
 116
 117 #ifndef CONSOLE_BAUD_RATE
 118 #define CONSOLE_BAUD_RATE       9600
 119 #define DEFAULT_CBAUD           B9600
 120 #endif
 121
 122
 123 static int m68328_console_initted = 0;
 124 static int m68328_console_baud    = CONSOLE_BAUD_RATE;
 125 static int m68328_console_cbaud   = DEFAULT_CBAUD;
 126
 127
 128 static inline int serial_paranoia_check(struct m68k_serial *info,
 129                                         char *name, const char *routine)
 130 {
 131 #ifdef SERIAL_PARANOIA_CHECK
 132         static const char *badmagic =
 133                 "Warning: bad magic number for serial struct %s in %s\n";
 134         static const char *badinfo =
 135                 "Warning: null m68k_serial for %s in %s\n";
 136
 137         if (!info) {
 138                 printk(badinfo, name, routine);
 139                 return 1;
 140         }
 141         if (info->magic != SERIAL_MAGIC) {
 142                 printk(badmagic, name, routine);
 143                 return 1;
 144         }
 145 #endif
 146         return 0;
 147 }
 148
 149 /*
 150  * This is used to figure out the divisor speeds and the timeouts
 151  */
 152 static int baud_table[] = {
 153         0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
 154         9600, 19200, 38400, 57600, 115200, 0 };
 155
 156 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
 157
 158 /* Sets or clears DTR/RTS on the requested line */
 159 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
 160 {
 161         if (set) {
 162                 /* set the RTS/CTS line */
 163         } else {
 164                 /* clear it */
 165         }
 166         return;
 167 }
 168
 169 /* Utility routines */
 170 static inline int get_baud(struct m68k_serial *ss)
 171 {
 172         unsigned long result = 115200;
 173         unsigned short int baud = uart_addr[ss->line].ubaud;
 174         if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
 175         result >>= GET_FIELD(baud, UBAUD_DIVIDE);
 176
 177         return result;
 178 }
 179
 180 /*
 181  * ------------------------------------------------------------
 182  * rs_stop() and rs_start()
 183  *
 184  * This routines are called before setting or resetting tty->stopped.
 185  * They enable or disable transmitter interrupts, as necessary.
 186  * ------------------------------------------------------------
 187  */
 188 static void rs_stop(struct tty_struct *tty)
 189 {
 190         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 191         m68328_uart *uart = &uart_addr[info->line];
 192         unsigned long flags;
 193
 194         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 195                 return;
 196
 197         local_irq_save(flags);
 198         uart->ustcnt &= ~USTCNT_TXEN;
 199         local_irq_restore(flags);
 200 }
 201
 202 static int rs_put_char(char ch)
 203 {
 204         int flags, loops = 0;
 205
 206         local_irq_save(flags);
 207
 208         while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
 209                 loops++;
 210                 udelay(5);
 211         }
 212
 213         UTX_TXDATA = ch;
 214         udelay(5);
 215         local_irq_restore(flags);
 216         return 1;
 217 }
 218
 219 static void rs_start(struct tty_struct *tty)
 220 {
 221         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 222         m68328_uart *uart = &uart_addr[info->line];
 223         unsigned long flags;
 224
 225         if (serial_paranoia_check(info, tty->name, "rs_start"))
 226                 return;
 227
 228         local_irq_save(flags);
 229         if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
 230 #ifdef USE_INTS
 231                 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 232 #else
 233                 uart->ustcnt |= USTCNT_TXEN;
 234 #endif
 235         }
 236         local_irq_restore(flags);
 237 }
 238
 239 /* Drop into either the boot monitor or kadb upon receiving a break
 240  * from keyboard/console input.
 241  */
 242 static void batten_down_hatches(void)
 243 {
 244         /* Drop into the debugger */
 245 }
 246
 247 static void status_handle(struct m68k_serial *info, unsigned short status)
 248 {
 249 #if 0
 250         if(status & DCD) {
 251                 if((info->port.tty->termios->c_cflag & CRTSCTS) &&
 252                    ((info->curregs[3] & AUTO_ENAB)==0)) {
 253                         info->curregs[3] |= AUTO_ENAB;
 254                         info->pendregs[3] |= AUTO_ENAB;
 255                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 256                 }
 257         } else {
 258                 if((info->curregs[3] & AUTO_ENAB)) {
 259                         info->curregs[3] &= ~AUTO_ENAB;
 260                         info->pendregs[3] &= ~AUTO_ENAB;
 261                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 262                 }
 263         }
 264 #endif
 265         /* If this is console input and this is a
 266          * 'break asserted' status change interrupt
 267          * see if we can drop into the debugger
 268          */
 269         if((status & URX_BREAK) && info->break_abort)
 270                 batten_down_hatches();
 271         return;
 272 }
 273
 274 static void receive_chars(struct m68k_serial *info, unsigned short rx)
 275 {
 276         struct tty_struct *tty = info->port.tty;
 277         m68328_uart *uart = &uart_addr[info->line];
 278         unsigned char ch, flag;
 279
 280         /*
 281          * This do { } while() loop will get ALL chars out of Rx FIFO
 282          */
 283 #ifndef CONFIG_XCOPILOT_BUGS
 284         do {
 285 #endif
 286                 ch = GET_FIELD(rx, URX_RXDATA);
 287
 288                 if(info->is_cons) {
 289                         if(URX_BREAK & rx) { /* whee, break received */
 290                                 status_handle(info, rx);
 291                                 return;
 292 #ifdef CONFIG_MAGIC_SYSRQ
 293                         } else if (ch == 0x10) { /* ^P */
 294                                 show_state();
 295                                 show_free_areas();
 296                                 show_buffers();
 297 /*                              show_net_buffers(); */
 298                                 return;
 299                         } else if (ch == 0x12) { /* ^R */
 300                                 emergency_restart();
 301                                 return;
 302 #endif /* CONFIG_MAGIC_SYSRQ */
 303                         }
 304                         /* It is a 'keyboard interrupt' ;-) */
 305 #ifdef CONFIG_CONSOLE
 306                         wake_up(&keypress_wait);
 307 #endif
 308                 }
 309
 310                 if(!tty)
 311                         goto clear_and_exit;
 312
 313                 flag = TTY_NORMAL;
 314
 315                 if(rx & URX_PARITY_ERROR) {
 316                         flag = TTY_PARITY;
 317                         status_handle(info, rx);
 318                 } else if(rx & URX_OVRUN) {
 319                         flag = TTY_OVERRUN;
 320                         status_handle(info, rx);
 321                 } else if(rx & URX_FRAME_ERROR) {
 322                         flag = TTY_FRAME;
 323                         status_handle(info, rx);
 324                 }
 325                 tty_insert_flip_char(tty, ch, flag);
 326 #ifndef CONFIG_XCOPILOT_BUGS
 327         } while((rx = uart->urx.w) & URX_DATA_READY);
 328 #endif
 329
 330         tty_schedule_flip(tty);
 331
 332 clear_and_exit:
 333         return;
 334 }
 335
 336 static void transmit_chars(struct m68k_serial *info)
 337 {
 338         m68328_uart *uart = &uart_addr[info->line];
 339
 340         if (info->x_char) {
 341                 /* Send next char */
 342                 uart->utx.b.txdata = info->x_char;
 343                 info->x_char = 0;
 344                 goto clear_and_return;
 345         }
 346
 347         if((info->xmit_cnt <= 0) || info->port.tty->stopped) {
 348                 /* That's peculiar... TX ints off */
 349                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 350                 goto clear_and_return;
 351         }
 352
 353         /* Send char */
 354         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 355         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 356         info->xmit_cnt--;
 357
 358         if (info->xmit_cnt < WAKEUP_CHARS)
 359                 schedule_work(&info->tqueue);
 360
 361         if(info->xmit_cnt <= 0) {
 362                 /* All done for now... TX ints off */
 363                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 364                 goto clear_and_return;
 365         }
 366
 367 clear_and_return:
 368         /* Clear interrupt (should be auto)*/
 369         return;
 370 }
 371
 372 /*
 373  * This is the serial driver's generic interrupt routine
 374  */
 375 irqreturn_t rs_interrupt(int irq, void *dev_id)
 376 {
 377         struct m68k_serial *info = dev_id;
 378         m68328_uart *uart;
 379         unsigned short rx;
 380         unsigned short tx;
 381
 382         uart = &uart_addr[info->line];
 383         rx = uart->urx.w;
 384
 385 #ifdef USE_INTS
 386         tx = uart->utx.w;
 387
 388         if (rx & URX_DATA_READY) receive_chars(info, rx);
 389         if (tx & UTX_TX_AVAIL)   transmit_chars(info);
 390 #else
 391         receive_chars(info, rx);
 392 #endif
 393         return IRQ_HANDLED;
 394 }
 395
 396 static void do_softint(struct work_struct *work)
 397 {
 398         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue);
 399         struct tty_struct       *tty;
 400
 401         tty = info->port.tty;
 402         if (!tty)
 403                 return;
 404 #if 0
 405         if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
 406                 tty_wakeup(tty);
 407         }
 408 #endif
 409 }
 410
 411 /*
 412  * This routine is called from the scheduler tqueue when the interrupt
 413  * routine has signalled that a hangup has occurred.  The path of
 414  * hangup processing is:
 415  *
 416  *      serial interrupt routine -> (scheduler tqueue) ->
 417  *      do_serial_hangup() -> tty->hangup() -> rs_hangup()
 418  *
 419  */
 420 static void do_serial_hangup(struct work_struct *work)
 421 {
 422         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue_hangup);
 423         struct tty_struct       *tty;
 424
 425         tty = info->port.tty;
 426         if (!tty)
 427                 return;
 428
 429         tty_hangup(tty);
 430 }
 431
 432
 433 static int startup(struct m68k_serial * info)
 434 {
 435         m68328_uart *uart = &uart_addr[info->line];
 436         unsigned long flags;
 437
 438         if (info->flags & S_INITIALIZED)
 439                 return 0;
 440
 441         if (!info->xmit_buf) {
 442                 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
 443                 if (!info->xmit_buf)
 444                         return -ENOMEM;
 445         }
 446
 447         local_irq_save(flags);
 448
 449         /*
 450          * Clear the FIFO buffers and disable them
 451          * (they will be reenabled in change_speed())
 452          */
 453
 454         uart->ustcnt = USTCNT_UEN;
 455         info->xmit_fifo_size = 1;
 456         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
 457         (void)uart->urx.w;
 458
 459         /*
 460          * Finally, enable sequencing and interrupts
 461          */
 462 #ifdef USE_INTS
 463         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
 464                  USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
 465 #else
 466         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
 467 #endif
 468
 469         if (info->port.tty)
 470                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
 471         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 472
 473         /*
 474          * and set the speed of the serial port
 475          */
 476
 477         change_speed(info);
 478
 479         info->flags |= S_INITIALIZED;
 480         local_irq_restore(flags);
 481         return 0;
 482 }
 483
 484 /*
 485  * This routine will shutdown a serial port; interrupts are disabled, and
 486  * DTR is dropped if the hangup on close termio flag is on.
 487  */
 488 static void shutdown(struct m68k_serial * info)
 489 {
 490         m68328_uart *uart = &uart_addr[info->line];
 491         unsigned long   flags;
 492
 493         uart->ustcnt = 0; /* All off! */
 494         if (!(info->flags & S_INITIALIZED))
 495                 return;
 496
 497         local_irq_save(flags);
 498
 499         if (info->xmit_buf) {
 500                 free_page((unsigned long) info->xmit_buf);
 501                 info->xmit_buf = 0;
 502         }
 503
 504         if (info->port.tty)
 505                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 506
 507         info->flags &= ~S_INITIALIZED;
 508         local_irq_restore(flags);
 509 }
 510
 511 struct {
 512         int divisor, prescale;
 513 }
 514 #ifndef CONFIG_M68VZ328
 515  hw_baud_table[18] = {
 516         {0,0}, /* 0 */
 517         {0,0}, /* 50 */
 518         {0,0}, /* 75 */
 519         {0,0}, /* 110 */
 520         {0,0}, /* 134 */
 521         {0,0}, /* 150 */
 522         {0,0}, /* 200 */
 523         {7,0x26}, /* 300 */
 524         {6,0x26}, /* 600 */
 525         {5,0x26}, /* 1200 */
 526         {0,0}, /* 1800 */
 527         {4,0x26}, /* 2400 */
 528         {3,0x26}, /* 4800 */
 529         {2,0x26}, /* 9600 */
 530         {1,0x26}, /* 19200 */
 531         {0,0x26}, /* 38400 */
 532         {1,0x38}, /* 57600 */
 533         {0,0x38}, /* 115200 */
 534 };
 535 #else
 536  hw_baud_table[18] = {
 537                  {0,0}, /* 0 */
 538                  {0,0}, /* 50 */
 539                  {0,0}, /* 75 */
 540                  {0,0}, /* 110 */
 541                  {0,0}, /* 134 */
 542                  {0,0}, /* 150 */
 543                  {0,0}, /* 200 */
 544                  {0,0}, /* 300 */
 545                  {7,0x26}, /* 600 */
 546                  {6,0x26}, /* 1200 */
 547                  {0,0}, /* 1800 */
 548                  {5,0x26}, /* 2400 */
 549                  {4,0x26}, /* 4800 */
 550                  {3,0x26}, /* 9600 */
 551                  {2,0x26}, /* 19200 */
 552                  {1,0x26}, /* 38400 */
 553                  {0,0x26}, /* 57600 */
 554                  {1,0x38}, /* 115200 */
 555 };
 556 #endif
 557 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
 558
 559 /*
 560  * This routine is called to set the UART divisor registers to match
 561  * the specified baud rate for a serial port.
 562  */
 563 static void change_speed(struct m68k_serial *info)
 564 {
 565         m68328_uart *uart = &uart_addr[info->line];
 566         unsigned short port;
 567         unsigned short ustcnt;
 568         unsigned cflag;
 569         int     i;
 570
 571         if (!info->port.tty || !info->port.tty->termios)
 572                 return;
 573         cflag = info->port.tty->termios->c_cflag;
 574         if (!(port = info->port))
 575                 return;
 576
 577         ustcnt = uart->ustcnt;
 578         uart->ustcnt = ustcnt & ~USTCNT_TXEN;
 579
 580         i = cflag & CBAUD;
 581         if (i & CBAUDEX) {
 582                 i = (i & ~CBAUDEX) + B38400;
 583         }
 584
 585         info->baud = baud_table[i];
 586         uart->ubaud = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
 587                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
 588
 589         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
 590
 591         if ((cflag & CSIZE) == CS8)
 592                 ustcnt |= USTCNT_8_7;
 593
 594         if (cflag & CSTOPB)
 595                 ustcnt |= USTCNT_STOP;
 596
 597         if (cflag & PARENB)
 598                 ustcnt |= USTCNT_PARITYEN;
 599         if (cflag & PARODD)
 600                 ustcnt |= USTCNT_ODD_EVEN;
 601
 602 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 603         if (cflag & CRTSCTS) {
 604                 uart->utx.w &= ~ UTX_NOCTS;
 605         } else {
 606                 uart->utx.w |= UTX_NOCTS;
 607         }
 608 #endif
 609
 610         ustcnt |= USTCNT_TXEN;
 611
 612         uart->ustcnt = ustcnt;
 613         return;
 614 }
 615
 616 /*
 617  * Fair output driver allows a process to speak.
 618  */
 619 static void rs_fair_output(void)
 620 {
 621         int left;               /* Output no more than that */
 622         unsigned long flags;
 623         struct m68k_serial *info = &m68k_soft[0];
 624         char c;
 625
 626         if (info == 0) return;
 627         if (info->xmit_buf == 0) return;
 628
 629         local_irq_save(flags);
 630         left = info->xmit_cnt;
 631         while (left != 0) {
 632                 c = info->xmit_buf[info->xmit_tail];
 633                 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
 634                 info->xmit_cnt--;
 635                 local_irq_restore(flags);
 636
 637                 rs_put_char(c);
 638
 639                 local_irq_save(flags);
 640                 left = min(info->xmit_cnt, left-1);
 641         }
 642
 643         /* Last character is being transmitted now (hopefully). */
 644         udelay(5);
 645
 646         local_irq_restore(flags);
 647         return;
 648 }
 649
 650 /*
 651  * m68k_console_print is registered for printk.
 652  */
 653 void console_print_68328(const char *p)
 654 {
 655         char c;
 656
 657         while((c=*(p++)) != 0) {
 658                 if(c == '\n')
 659                         rs_put_char('\r');
 660                 rs_put_char(c);
 661         }
 662
 663         /* Comment this if you want to have a strict interrupt-driven output */
 664         rs_fair_output();
 665
 666         return;
 667 }
 668
 669 static void rs_set_ldisc(struct tty_struct *tty)
 670 {
 671         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 672
 673         if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
 674                 return;
 675
 676         info->is_cons = (tty->termios->c_line == N_TTY);
 677
 678         printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
 679 }
 680
 681 static void rs_flush_chars(struct tty_struct *tty)
 682 {
 683         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 684         m68328_uart *uart = &uart_addr[info->line];
 685         unsigned long flags;
 686
 687         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 688                 return;
 689 #ifndef USE_INTS
 690         for(;;) {
 691 #endif
 692
 693         /* Enable transmitter */
 694         local_irq_save(flags);
 695
 696         if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
 697                         !info->xmit_buf) {
 698                 local_irq_restore(flags);
 699                 return;
 700         }
 701
 702 #ifdef USE_INTS
 703         uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 704 #else
 705         uart->ustcnt |= USTCNT_TXEN;
 706 #endif
 707
 708 #ifdef USE_INTS
 709         if (uart->utx.w & UTX_TX_AVAIL) {
 710 #else
 711         if (1) {
 712 #endif
 713                 /* Send char */
 714                 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 715                 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 716                 info->xmit_cnt--;
 717         }
 718
 719 #ifndef USE_INTS
 720         while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 721         }
 722 #endif
 723         local_irq_restore(flags);
 724 }
 725
 726 extern void console_printn(const char * b, int count);
 727
 728 static int rs_write(struct tty_struct * tty,
 729                     const unsigned char *buf, int count)
 730 {
 731         int     c, total = 0;
 732         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 733         m68328_uart *uart = &uart_addr[info->line];
 734         unsigned long flags;
 735
 736         if (serial_paranoia_check(info, tty->name, "rs_write"))
 737                 return 0;
 738
 739         if (!tty || !info->xmit_buf)
 740                 return 0;
 741
 742         local_save_flags(flags);
 743         while (1) {
 744                 local_irq_disable();
 745                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
 746                                    SERIAL_XMIT_SIZE - info->xmit_head));
 747                 local_irq_restore(flags);
 748
 749                 if (c <= 0)
 750                         break;
 751
 752                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
 753
 754                 local_irq_disable();
 755                 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
 756                 info->xmit_cnt += c;
 757                 local_irq_restore(flags);
 758                 buf += c;
 759                 count -= c;
 760                 total += c;
 761         }
 762
 763         if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
 764                 /* Enable transmitter */
 765                 local_irq_disable();
 766 #ifndef USE_INTS
 767                 while(info->xmit_cnt) {
 768 #endif
 769
 770                 uart->ustcnt |= USTCNT_TXEN;
 771 #ifdef USE_INTS
 772                 uart->ustcnt |= USTCNT_TX_INTR_MASK;
 773 #else
 774                 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 775 #endif
 776                 if (uart->utx.w & UTX_TX_AVAIL) {
 777                         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 778                         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 779                         info->xmit_cnt--;
 780                 }
 781
 782 #ifndef USE_INTS
 783                 }
 784 #endif
 785                 local_irq_restore(flags);
 786         }
 787
 788         return total;
 789 }
 790
 791 static int rs_write_room(struct tty_struct *tty)
 792 {
 793         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 794         int     ret;
 795
 796         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 797                 return 0;
 798         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
 799         if (ret < 0)
 800                 ret = 0;
 801         return ret;
 802 }
 803
 804 static int rs_chars_in_buffer(struct tty_struct *tty)
 805 {
 806         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 807
 808         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 809                 return 0;
 810         return info->xmit_cnt;
 811 }
 812
 813 static void rs_flush_buffer(struct tty_struct *tty)
 814 {
 815         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 816         unsigned long flags;
 817
 818         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 819                 return;
 820         local_irq_save(flags);
 821         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 822         local_irq_restore(flags);
 823         tty_wakeup(tty);
 824 }
 825
 826 /*
 827  * ------------------------------------------------------------
 828  * rs_throttle()
 829  *
 830  * This routine is called by the upper-layer tty layer to signal that
 831  * incoming characters should be throttled.
 832  * ------------------------------------------------------------
 833  */
 834 static void rs_throttle(struct tty_struct * tty)
 835 {
 836         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 837
 838         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 839                 return;
 840
 841         if (I_IXOFF(tty))
 842                 info->x_char = STOP_CHAR(tty);
 843
 844         /* Turn off RTS line (do this atomic) */
 845 }
 846
 847 static void rs_unthrottle(struct tty_struct * tty)
 848 {
 849         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 850
 851         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
 852                 return;
 853
 854         if (I_IXOFF(tty)) {
 855                 if (info->x_char)
 856                         info->x_char = 0;
 857                 else
 858                         info->x_char = START_CHAR(tty);
 859         }
 860
 861         /* Assert RTS line (do this atomic) */
 862 }
 863
 864 /*
 865  * ------------------------------------------------------------
 866  * rs_ioctl() and friends
 867  * ------------------------------------------------------------
 868  */
 869
 870 static int get_serial_info(struct m68k_serial * info,
 871                            struct serial_struct * retinfo)
 872 {
 873         struct serial_struct tmp;
 874
 875         if (!retinfo)
 876                 return -EFAULT;
 877         memset(&tmp, 0, sizeof(tmp));
 878         tmp.type = info->type;
 879         tmp.line = info->line;
 880         tmp.port = info->port;
 881         tmp.irq = info->irq;
 882         tmp.flags = info->flags;
 883         tmp.baud_base = info->baud_base;
 884         tmp.close_delay = info->close_delay;
 885         tmp.closing_wait = info->closing_wait;
 886         tmp.custom_divisor = info->custom_divisor;
 887         copy_to_user(retinfo,&tmp,sizeof(*retinfo));
 888         return 0;
 889 }
 890
 891 static int set_serial_info(struct m68k_serial * info,
 892                            struct serial_struct * new_info)
 893 {
 894         struct serial_struct new_serial;
 895         struct m68k_serial old_info;
 896         int                     retval = 0;
 897
 898         if (!new_info)
 899                 return -EFAULT;
 900         copy_from_user(&new_serial,new_info,sizeof(new_serial));
 901         old_info = *info;
 902
 903         if (!capable(CAP_SYS_ADMIN)) {
 904                 if ((new_serial.baud_base != info->baud_base) ||
 905                     (new_serial.type != info->type) ||
 906                     (new_serial.close_delay != info->close_delay) ||
 907                     ((new_serial.flags & ~S_USR_MASK) !=
 908                      (info->flags & ~S_USR_MASK)))
 909                         return -EPERM;
 910                 info->flags = ((info->flags & ~S_USR_MASK) |
 911                                (new_serial.flags & S_USR_MASK));
 912                 info->custom_divisor = new_serial.custom_divisor;
 913                 goto check_and_exit;
 914         }
 915
 916         if (info->count > 1)
 917                 return -EBUSY;
 918
 919         /*
 920          * OK, past this point, all the error checking has been done.
 921          * At this point, we start making changes.....
 922          */
 923
 924         info->baud_base = new_serial.baud_base;
 925         info->flags = ((info->flags & ~S_FLAGS) |
 926                         (new_serial.flags & S_FLAGS));
 927         info->type = new_serial.type;
 928         info->close_delay = new_serial.close_delay;
 929         info->closing_wait = new_serial.closing_wait;
 930
 931 check_and_exit:
 932         retval = startup(info);
 933         return retval;
 934 }
 935
 936 /*
 937  * get_lsr_info - get line status register info
 938  *
 939  * Purpose: Let user call ioctl() to get info when the UART physically
 940  *          is emptied.  On bus types like RS485, the transmitter must
 941  *          release the bus after transmitting. This must be done when
 942  *          the transmit shift register is empty, not be done when the
 943  *          transmit holding register is empty.  This functionality
 944  *          allows an RS485 driver to be written in user space.
 945  */
 946 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
 947 {
 948 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 949         m68328_uart *uart = &uart_addr[info->line];
 950 #endif
 951         unsigned char status;
 952         unsigned long flags;
 953
 954         local_irq_save(flags);
 955 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 956         status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
 957 #else
 958         status = 0;
 959 #endif
 960         local_irq_restore(flags);
 961         put_user(status,value);
 962         return 0;
 963 }
 964
 965 /*
 966  * This routine sends a break character out the serial port.
 967  */
 968 static void send_break(struct m68k_serial * info, unsigned int duration)
 969 {
 970         m68328_uart *uart = &uart_addr[info->line];
 971         unsigned long flags;
 972         if (!info->port)
 973                 return;
 974         local_irq_save(flags);
 975 #ifdef USE_INTS
 976         uart->utx.w |= UTX_SEND_BREAK;
 977         msleep_interruptible(duration);
 978         uart->utx.w &= ~UTX_SEND_BREAK;
 979 #endif
 980         local_irq_restore(flags);
 981 }
 982
 983 static int rs_ioctl(struct tty_struct *tty, struct file * file,
 984                     unsigned int cmd, unsigned long arg)
 985 {
 986         int error;
 987         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
 988         int retval;
 989
 990         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
 991                 return -ENODEV;
 992
 993         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 994             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
 995             (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
 996                 if (tty->flags & (1 << TTY_IO_ERROR))
 997                     return -EIO;
 998         }
 999
1000         switch (cmd) {
1001                 case TCSBRK:    /* SVID version: non-zero arg --> no break */
1002                         retval = tty_check_change(tty);
1003                         if (retval)
1004                                 return retval;
1005                         tty_wait_until_sent(tty, 0);
1006                         if (!arg)
1007                                 send_break(info, 250);  /* 1/4 second */
1008                         return 0;
1009                 case TCSBRKP:   /* support for POSIX tcsendbreak() */
1010                         retval = tty_check_change(tty);
1011                         if (retval)
1012                                 return retval;
1013                         tty_wait_until_sent(tty, 0);
1014                         send_break(info, arg ? arg*(100) : 250);
1015                         return 0;
1016                 case TIOCGSERIAL:
1017                         if (access_ok(VERIFY_WRITE, (void *) arg,
1018                                                 sizeof(struct serial_struct)))
1019                                 return get_serial_info(info,
1020                                                (struct serial_struct *) arg);
1021                         return -EFAULT;
1022                 case TIOCSSERIAL:
1023                         return set_serial_info(info,
1024                                                (struct serial_struct *) arg);
1025                 case TIOCSERGETLSR: /* Get line status register */
1026                         if (access_ok(VERIFY_WRITE, (void *) arg,
1027                                                 sizeof(unsigned int)))
1028                                 return get_lsr_info(info, (unsigned int *) arg);
1029                         return -EFAULT;
1030                 case TIOCSERGSTRUCT:
1031                         if (!access_ok(VERIFY_WRITE, (void *) arg,
1032                                                 sizeof(struct m68k_serial)))
1033                                 return -EFAULT;
1034                         copy_to_user((struct m68k_serial *) arg,
1035                                     info, sizeof(struct m68k_serial));
1036                         return 0;
1037
1038                 default:
1039                         return -ENOIOCTLCMD;
1040                 }
1041         return 0;
1042 }
1043
1044 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1045 {
1046         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1047
1048         change_speed(info);
1049
1050         if ((old_termios->c_cflag & CRTSCTS) &&
1051             !(tty->termios->c_cflag & CRTSCTS)) {
1052                 tty->hw_stopped = 0;
1053                 rs_start(tty);
1054         }
1055
1056 }
1057
1058 /*
1059  * ------------------------------------------------------------
1060  * rs_close()
1061  *
1062  * This routine is called when the serial port gets closed.  First, we
1063  * wait for the last remaining data to be sent.  Then, we unlink its
1064  * S structure from the interrupt chain if necessary, and we free
1065  * that IRQ if nothing is left in the chain.
1066  * ------------------------------------------------------------
1067  */
1068 static void rs_close(struct tty_struct *tty, struct file * filp)
1069 {
1070         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1071         m68328_uart *uart = &uart_addr[info->line];
1072         unsigned long flags;
1073
1074         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1075                 return;
1076
1077         local_irq_save(flags);
1078
1079         if (tty_hung_up_p(filp)) {
1080                 local_irq_restore(flags);
1081                 return;
1082         }
1083
1084         if ((tty->count == 1) && (info->count != 1)) {
1085                 /*
1086                  * Uh, oh.  tty->count is 1, which means that the tty
1087                  * structure will be freed.  Info->count should always
1088                  * be one in these conditions.  If it's greater than
1089                  * one, we've got real problems, since it means the
1090                  * serial port won't be shutdown.
1091                  */
1092                 printk("rs_close: bad serial port count; tty->count is 1, "
1093                        "info->count is %d\n", info->count);
1094                 info->count = 1;
1095         }
1096         if (--info->count < 0) {
1097                 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1098                        info->line, info->count);
1099                 info->count = 0;
1100         }
1101         if (info->count) {
1102                 local_irq_restore(flags);
1103                 return;
1104         }
1105         info->flags |= S_CLOSING;
1106         /*
1107          * Now we wait for the transmit buffer to clear; and we notify
1108          * the line discipline to only process XON/XOFF characters.
1109          */
1110         tty->closing = 1;
1111         if (info->closing_wait != S_CLOSING_WAIT_NONE)
1112                 tty_wait_until_sent(tty, info->closing_wait);
1113         /*
1114          * At this point we stop accepting input.  To do this, we
1115          * disable the receive line status interrupts, and tell the
1116          * interrupt driver to stop checking the data ready bit in the
1117          * line status register.
1118          */
1119
1120         uart->ustcnt &= ~USTCNT_RXEN;
1121         uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1122
1123         shutdown(info);
1124         rs_flush_buffer(tty);
1125
1126         tty_ldisc_flush(tty);
1127         tty->closing = 0;
1128         info->event = 0;
1129         info->port.tty = NULL;
1130 #warning "This is not and has never been valid so fix it"
1131 #if 0
1132         if (tty->ldisc.num != ldiscs[N_TTY].num) {
1133                 if (tty->ldisc.close)
1134                         (tty->ldisc.close)(tty);
1135                 tty->ldisc = ldiscs[N_TTY];
1136                 tty->termios->c_line = N_TTY;
1137                 if (tty->ldisc.open)
1138                         (tty->ldisc.open)(tty);
1139         }
1140 #endif
1141         if (info->blocked_open) {
1142                 if (info->close_delay) {
1143                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1144                 }
1145                 wake_up_interruptible(&info->open_wait);
1146         }
1147         info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1148         wake_up_interruptible(&info->close_wait);
1149         local_irq_restore(flags);
1150 }
1151
1152 /*
1153  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1154  */
1155 void rs_hangup(struct tty_struct *tty)
1156 {
1157         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1158
1159         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1160                 return;
1161
1162         rs_flush_buffer(tty);
1163         shutdown(info);
1164         info->event = 0;
1165         info->count = 0;
1166         info->flags &= ~S_NORMAL_ACTIVE;
1167         info->port.tty = NULL;
1168         wake_up_interruptible(&info->open_wait);
1169 }
1170
1171 /*
1172  * ------------------------------------------------------------
1173  * rs_open() and friends
1174  * ------------------------------------------------------------
1175  */
1176 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1177                            struct m68k_serial *info)
1178 {
1179         DECLARE_WAITQUEUE(wait, current);
1180         int             retval;
1181         int             do_clocal = 0;
1182
1183         /*
1184          * If the device is in the middle of being closed, then block
1185          * until it's done, and then try again.
1186          */
1187         if (info->flags & S_CLOSING) {
1188                 interruptible_sleep_on(&info->close_wait);
1189 #ifdef SERIAL_DO_RESTART
1190                 if (info->flags & S_HUP_NOTIFY)
1191                         return -EAGAIN;
1192                 else
1193                         return -ERESTARTSYS;
1194 #else
1195                 return -EAGAIN;
1196 #endif
1197         }
1198
1199         /*
1200          * If non-blocking mode is set, or the port is not enabled,
1201          * then make the check up front and then exit.
1202          */
1203         if ((filp->f_flags & O_NONBLOCK) ||
1204             (tty->flags & (1 << TTY_IO_ERROR))) {
1205                 info->flags |= S_NORMAL_ACTIVE;
1206                 return 0;
1207         }
1208
1209         if (tty->termios->c_cflag & CLOCAL)
1210                 do_clocal = 1;
1211
1212         /*
1213          * Block waiting for the carrier detect and the line to become
1214          * free (i.e., not in use by the callout).  While we are in
1215          * this loop, info->count is dropped by one, so that
1216          * rs_close() knows when to free things.  We restore it upon
1217          * exit, either normal or abnormal.
1218          */
1219         retval = 0;
1220         add_wait_queue(&info->open_wait, &wait);
1221
1222         info->count--;
1223         info->blocked_open++;
1224         while (1) {
1225                 local_irq_disable();
1226                 m68k_rtsdtr(info, 1);
1227                 local_irq_enable();
1228                 current->state = TASK_INTERRUPTIBLE;
1229                 if (tty_hung_up_p(filp) ||
1230                     !(info->flags & S_INITIALIZED)) {
1231 #ifdef SERIAL_DO_RESTART
1232                         if (info->flags & S_HUP_NOTIFY)
1233                                 retval = -EAGAIN;
1234                         else
1235                                 retval = -ERESTARTSYS;
1236 #else
1237                         retval = -EAGAIN;
1238 #endif
1239                         break;
1240                 }
1241                 if (!(info->flags & S_CLOSING) && do_clocal)
1242                         break;
1243                 if (signal_pending(current)) {
1244                         retval = -ERESTARTSYS;
1245                         break;
1246                 }
1247                 schedule();
1248         }
1249         current->state = TASK_RUNNING;
1250         remove_wait_queue(&info->open_wait, &wait);
1251         if (!tty_hung_up_p(filp))
1252                 info->count++;
1253         info->blocked_open--;
1254
1255         if (retval)
1256                 return retval;
1257         info->flags |= S_NORMAL_ACTIVE;
1258         return 0;
1259 }
1260
1261 /*
1262  * This routine is called whenever a serial port is opened.  It
1263  * enables interrupts for a serial port, linking in its S structure into
1264  * the IRQ chain.   It also performs the serial-specific
1265  * initialization for the tty structure.
1266  */
1267 int rs_open(struct tty_struct *tty, struct file * filp)
1268 {
1269         struct m68k_serial      *info;
1270         int                     retval, line;
1271
1272         line = tty->index;
1273
1274         if (line >= NR_PORTS || line < 0) /* we have exactly one */
1275                 return -ENODEV;
1276
1277         info = &m68k_soft[line];
1278
1279         if (serial_paranoia_check(info, tty->name, "rs_open"))
1280                 return -ENODEV;
1281
1282         info->count++;
1283         tty->driver_data = info;
1284         info->port.tty = tty;
1285
1286         /*
1287          * Start up serial port
1288          */
1289         retval = startup(info);
1290         if (retval)
1291                 return retval;
1292
1293         return block_til_ready(tty, filp, info);
1294 }
1295
1296 /* Finally, routines used to initialize the serial driver. */
1297
1298 static void show_serial_version(void)
1299 {
1300         printk("MC68328 serial driver version 1.00\n");
1301 }
1302
1303 static const struct tty_operations rs_ops = {
1304         .open = rs_open,
1305         .close = rs_close,
1306         .write = rs_write,
1307         .flush_chars = rs_flush_chars,
1308         .write_room = rs_write_room,
1309         .chars_in_buffer = rs_chars_in_buffer,
1310         .flush_buffer = rs_flush_buffer,
1311         .ioctl = rs_ioctl,
1312         .throttle = rs_throttle,
1313         .unthrottle = rs_unthrottle,
1314         .set_termios = rs_set_termios,
1315         .stop = rs_stop,
1316         .start = rs_start,
1317         .hangup = rs_hangup,
1318         .set_ldisc = rs_set_ldisc,
1319 };
1320
1321 /* rs_init inits the driver */
1322 static int __init
1323 rs68328_init(void)
1324 {
1325         int flags, i;
1326         struct m68k_serial *info;
1327
1328         serial_driver = alloc_tty_driver(NR_PORTS);
1329         if (!serial_driver)
1330                 return -ENOMEM;
1331
1332         show_serial_version();
1333
1334         /* Initialize the tty_driver structure */
1335         /* SPARC: Not all of this is exactly right for us. */
1336
1337         serial_driver->name = "ttyS";
1338         serial_driver->major = TTY_MAJOR;
1339         serial_driver->minor_start = 64;
1340         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1341         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1342         serial_driver->init_termios = tty_std_termios;
1343         serial_driver->init_termios.c_cflag =
1344                         m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1345         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1346         tty_set_operations(serial_driver, &rs_ops);
1347
1348         if (tty_register_driver(serial_driver)) {
1349                 put_tty_driver(serial_driver);
1350                 printk(KERN_ERR "Couldn't register serial driver\n");
1351                 return -ENOMEM;
1352         }
1353
1354         local_irq_save(flags);
1355
1356         for(i=0;i<NR_PORTS;i++) {
1357
1358             info = &m68k_soft[i];
1359             info->magic = SERIAL_MAGIC;
1360             info->port = (int) &uart_addr[i];
1361             info->port.tty = NULL;
1362             info->irq = uart_irqs[i];
1363             info->custom_divisor = 16;
1364             info->close_delay = 50;
1365             info->closing_wait = 3000;
1366             info->x_char = 0;
1367             info->event = 0;
1368             info->count = 0;
1369             info->blocked_open = 0;
1370             INIT_WORK(&info->tqueue, do_softint);
1371             INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1372             init_waitqueue_head(&info->open_wait);
1373             init_waitqueue_head(&info->close_wait);
1374             info->line = i;
1375             info->is_cons = 1; /* Means shortcuts work */
1376
1377             printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1378                    info->port, info->irq);
1379             printk(" is a builtin MC68328 UART\n");
1380
1381 #ifdef CONFIG_M68VZ328
1382                 if (i > 0 )
1383                         PJSEL &= 0xCF;  /* PSW enable second port output */
1384 #endif
1385
1386             if (request_irq(uart_irqs[i],
1387                             rs_interrupt,
1388                             IRQF_DISABLED,
1389                             "M68328_UART", info))
1390                 panic("Unable to attach 68328 serial interrupt\n");
1391         }
1392         local_irq_restore(flags);
1393         return 0;
1394 }
1395
1396 module_init(rs68328_init);
1397
1398
1399
1400 static void m68328_set_baud(void)
1401 {
1402         unsigned short ustcnt;
1403         int     i;
1404
1405         ustcnt = USTCNT;
1406         USTCNT = ustcnt & ~USTCNT_TXEN;
1407
1408 again:
1409         for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++)
1410                 if (baud_table[i] == m68328_console_baud)
1411                         break;
1412         if (i >= sizeof(baud_table) / sizeof(baud_table[0])) {
1413                 m68328_console_baud = 9600;
1414                 goto again;
1415         }
1416
1417         UBAUD = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
1418                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1419         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1420         ustcnt |= USTCNT_8_7;
1421         ustcnt |= USTCNT_TXEN;
1422         USTCNT = ustcnt;
1423         m68328_console_initted = 1;
1424         return;
1425 }
1426
1427
1428 int m68328_console_setup(struct console *cp, char *arg)
1429 {
1430         int             i, n = CONSOLE_BAUD_RATE;
1431
1432         if (!cp)
1433                 return(-1);
1434
1435         if (arg)
1436                 n = simple_strtoul(arg,NULL,0);
1437
1438         for (i = 0; i < BAUD_TABLE_SIZE; i++)
1439                 if (baud_table[i] == n)
1440                         break;
1441         if (i < BAUD_TABLE_SIZE) {
1442                 m68328_console_baud = n;
1443                 m68328_console_cbaud = 0;
1444                 if (i > 15) {
1445                         m68328_console_cbaud |= CBAUDEX;
1446                         i -= 15;
1447                 }
1448                 m68328_console_cbaud |= i;
1449         }
1450
1451         m68328_set_baud(); /* make sure baud rate changes */
1452         return(0);
1453 }
1454
1455
1456 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1457 {
1458         *index = c->index;
1459         return serial_driver;
1460 }
1461
1462
1463 void m68328_console_write (struct console *co, const char *str,
1464                            unsigned int count)
1465 {
1466         if (!m68328_console_initted)
1467                 m68328_set_baud();
1468     while (count--) {
1469         if (*str == '\n')
1470            rs_put_char('\r');
1471         rs_put_char( *str++ );
1472     }
1473 }
1474
1475
1476 static struct console m68328_driver = {
1477         .name           = "ttyS",
1478         .write          = m68328_console_write,
1479         .device         = m68328_console_device,
1480         .setup          = m68328_console_setup,
1481         .flags          = CON_PRINTBUFFER,
1482         .index          = -1,
1483 };
1484
1485
1486 static int __init m68328_console_init(void)
1487 {
1488         register_console(&m68328_driver);
1489         return 0;
1490 }
1491
1492 console_initcall(m68328_console_init);