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 struct m68k_serial *IRQ_ports[NR_IRQS];
  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 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
 158
 159 /* Sets or clears DTR/RTS on the requested line */
 160 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
 161 {
 162         if (set) {
 163                 /* set the RTS/CTS line */
 164         } else {
 165                 /* clear it */
 166         }
 167         return;
 168 }
 169
 170 /* Utility routines */
 171 static inline int get_baud(struct m68k_serial *ss)
 172 {
 173         unsigned long result = 115200;
 174         unsigned short int baud = uart_addr[ss->line].ubaud;
 175         if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
 176         result >>= GET_FIELD(baud, UBAUD_DIVIDE);
 177
 178         return result;
 179 }
 180
 181 /*
 182  * ------------------------------------------------------------
 183  * rs_stop() and rs_start()
 184  *
 185  * This routines are called before setting or resetting tty->stopped.
 186  * They enable or disable transmitter interrupts, as necessary.
 187  * ------------------------------------------------------------
 188  */
 189 static void rs_stop(struct tty_struct *tty)
 190 {
 191         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 192         m68328_uart *uart = &uart_addr[info->line];
 193         unsigned long flags;
 194
 195         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 196                 return;
 197
 198         local_irq_save(flags);
 199         uart->ustcnt &= ~USTCNT_TXEN;
 200         local_irq_restore(flags);
 201 }
 202
 203 static int rs_put_char(char ch)
 204 {
 205         int flags, loops = 0;
 206
 207         local_irq_save(flags);
 208
 209         while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
 210                 loops++;
 211                 udelay(5);
 212         }
 213
 214         UTX_TXDATA = ch;
 215         udelay(5);
 216         local_irq_restore(flags);
 217         return 1;
 218 }
 219
 220 static void rs_start(struct tty_struct *tty)
 221 {
 222         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 223         m68328_uart *uart = &uart_addr[info->line];
 224         unsigned long flags;
 225
 226         if (serial_paranoia_check(info, tty->name, "rs_start"))
 227                 return;
 228
 229         local_irq_save(flags);
 230         if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
 231 #ifdef USE_INTS
 232                 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 233 #else
 234                 uart->ustcnt |= USTCNT_TXEN;
 235 #endif
 236         }
 237         local_irq_restore(flags);
 238 }
 239
 240 /* Drop into either the boot monitor or kadb upon receiving a break
 241  * from keyboard/console input.
 242  */
 243 static void batten_down_hatches(void)
 244 {
 245         /* Drop into the debugger */
 246 }
 247
 248 static void status_handle(struct m68k_serial *info, unsigned short status)
 249 {
 250 #if 0
 251         if(status & DCD) {
 252                 if((info->port.tty->termios->c_cflag & CRTSCTS) &&
 253                    ((info->curregs[3] & AUTO_ENAB)==0)) {
 254                         info->curregs[3] |= AUTO_ENAB;
 255                         info->pendregs[3] |= AUTO_ENAB;
 256                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 257                 }
 258         } else {
 259                 if((info->curregs[3] & AUTO_ENAB)) {
 260                         info->curregs[3] &= ~AUTO_ENAB;
 261                         info->pendregs[3] &= ~AUTO_ENAB;
 262                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 263                 }
 264         }
 265 #endif
 266         /* If this is console input and this is a
 267          * 'break asserted' status change interrupt
 268          * see if we can drop into the debugger
 269          */
 270         if((status & URX_BREAK) && info->break_abort)
 271                 batten_down_hatches();
 272         return;
 273 }
 274
 275 static void receive_chars(struct m68k_serial *info, unsigned short rx)
 276 {
 277         struct tty_struct *tty = info->port.tty;
 278         m68328_uart *uart = &uart_addr[info->line];
 279         unsigned char ch, flag;
 280
 281         /*
 282          * This do { } while() loop will get ALL chars out of Rx FIFO
 283          */
 284 #ifndef CONFIG_XCOPILOT_BUGS
 285         do {
 286 #endif
 287                 ch = GET_FIELD(rx, URX_RXDATA);
 288
 289                 if(info->is_cons) {
 290                         if(URX_BREAK & rx) { /* whee, break received */
 291                                 status_handle(info, rx);
 292                                 return;
 293 #ifdef CONFIG_MAGIC_SYSRQ
 294                         } else if (ch == 0x10) { /* ^P */
 295                                 show_state();
 296                                 show_free_areas();
 297                                 show_buffers();
 298 /*                              show_net_buffers(); */
 299                                 return;
 300                         } else if (ch == 0x12) { /* ^R */
 301                                 emergency_restart();
 302                                 return;
 303 #endif /* CONFIG_MAGIC_SYSRQ */
 304                         }
 305                         /* It is a 'keyboard interrupt' ;-) */
 306 #ifdef CONFIG_CONSOLE
 307                         wake_up(&keypress_wait);
 308 #endif
 309                 }
 310
 311                 if(!tty)
 312                         goto clear_and_exit;
 313
 314                 flag = TTY_NORMAL;
 315
 316                 if(rx & URX_PARITY_ERROR) {
 317                         flag = TTY_PARITY;
 318                         status_handle(info, rx);
 319                 } else if(rx & URX_OVRUN) {
 320                         flag = TTY_OVERRUN;
 321                         status_handle(info, rx);
 322                 } else if(rx & URX_FRAME_ERROR) {
 323                         flag = TTY_FRAME;
 324                         status_handle(info, rx);
 325                 }
 326                 tty_insert_flip_char(tty, ch, flag);
 327 #ifndef CONFIG_XCOPILOT_BUGS
 328         } while((rx = uart->urx.w) & URX_DATA_READY);
 329 #endif
 330
 331         tty_schedule_flip(tty);
 332
 333 clear_and_exit:
 334         return;
 335 }
 336
 337 static void transmit_chars(struct m68k_serial *info)
 338 {
 339         m68328_uart *uart = &uart_addr[info->line];
 340
 341         if (info->x_char) {
 342                 /* Send next char */
 343                 uart->utx.b.txdata = info->x_char;
 344                 info->x_char = 0;
 345                 goto clear_and_return;
 346         }
 347
 348         if((info->xmit_cnt <= 0) || info->port.tty->stopped) {
 349                 /* That's peculiar... TX ints off */
 350                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 351                 goto clear_and_return;
 352         }
 353
 354         /* Send char */
 355         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 356         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 357         info->xmit_cnt--;
 358
 359         if (info->xmit_cnt < WAKEUP_CHARS)
 360                 schedule_work(&info->tqueue);
 361
 362         if(info->xmit_cnt <= 0) {
 363                 /* All done for now... TX ints off */
 364                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 365                 goto clear_and_return;
 366         }
 367
 368 clear_and_return:
 369         /* Clear interrupt (should be auto)*/
 370         return;
 371 }
 372
 373 /*
 374  * This is the serial driver's generic interrupt routine
 375  */
 376 irqreturn_t rs_interrupt(int irq, void *dev_id)
 377 {
 378         struct m68k_serial * info;
 379         m68328_uart *uart;
 380         unsigned short rx;
 381         unsigned short tx;
 382
 383         info = IRQ_ports[irq];
 384         if(!info)
 385             return IRQ_NONE;
 386
 387         uart = &uart_addr[info->line];
 388         rx = uart->urx.w;
 389
 390 #ifdef USE_INTS
 391         tx = uart->utx.w;
 392
 393         if (rx & URX_DATA_READY) receive_chars(info, rx);
 394         if (tx & UTX_TX_AVAIL)   transmit_chars(info);
 395 #else
 396         receive_chars(info, rx);
 397 #endif
 398         return IRQ_HANDLED;
 399 }
 400
 401 static void do_softint(struct work_struct *work)
 402 {
 403         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue);
 404         struct tty_struct       *tty;
 405
 406         tty = info->port.tty;
 407         if (!tty)
 408                 return;
 409 #if 0
 410         if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
 411                 tty_wakeup(tty);
 412         }
 413 #endif
 414 }
 415
 416 /*
 417  * This routine is called from the scheduler tqueue when the interrupt
 418  * routine has signalled that a hangup has occurred.  The path of
 419  * hangup processing is:
 420  *
 421  *      serial interrupt routine -> (scheduler tqueue) ->
 422  *      do_serial_hangup() -> tty->hangup() -> rs_hangup()
 423  *
 424  */
 425 static void do_serial_hangup(struct work_struct *work)
 426 {
 427         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue_hangup);
 428         struct tty_struct       *tty;
 429
 430         tty = info->port.tty;
 431         if (!tty)
 432                 return;
 433
 434         tty_hangup(tty);
 435 }
 436
 437
 438 static int startup(struct m68k_serial * info)
 439 {
 440         m68328_uart *uart = &uart_addr[info->line];
 441         unsigned long flags;
 442
 443         if (info->flags & S_INITIALIZED)
 444                 return 0;
 445
 446         if (!info->xmit_buf) {
 447                 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
 448                 if (!info->xmit_buf)
 449                         return -ENOMEM;
 450         }
 451
 452         local_irq_save(flags);
 453
 454         /*
 455          * Clear the FIFO buffers and disable them
 456          * (they will be reenabled in change_speed())
 457          */
 458
 459         uart->ustcnt = USTCNT_UEN;
 460         info->xmit_fifo_size = 1;
 461         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
 462         (void)uart->urx.w;
 463
 464         /*
 465          * Finally, enable sequencing and interrupts
 466          */
 467 #ifdef USE_INTS
 468         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
 469                  USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
 470 #else
 471         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
 472 #endif
 473
 474         if (info->port.tty)
 475                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
 476         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 477
 478         /*
 479          * and set the speed of the serial port
 480          */
 481
 482         change_speed(info);
 483
 484         info->flags |= S_INITIALIZED;
 485         local_irq_restore(flags);
 486         return 0;
 487 }
 488
 489 /*
 490  * This routine will shutdown a serial port; interrupts are disabled, and
 491  * DTR is dropped if the hangup on close termio flag is on.
 492  */
 493 static void shutdown(struct m68k_serial * info)
 494 {
 495         m68328_uart *uart = &uart_addr[info->line];
 496         unsigned long   flags;
 497
 498         uart->ustcnt = 0; /* All off! */
 499         if (!(info->flags & S_INITIALIZED))
 500                 return;
 501
 502         local_irq_save(flags);
 503
 504         if (info->xmit_buf) {
 505                 free_page((unsigned long) info->xmit_buf);
 506                 info->xmit_buf = 0;
 507         }
 508
 509         if (info->port.tty)
 510                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 511
 512         info->flags &= ~S_INITIALIZED;
 513         local_irq_restore(flags);
 514 }
 515
 516 struct {
 517         int divisor, prescale;
 518 }
 519 #ifndef CONFIG_M68VZ328
 520  hw_baud_table[18] = {
 521         {0,0}, /* 0 */
 522         {0,0}, /* 50 */
 523         {0,0}, /* 75 */
 524         {0,0}, /* 110 */
 525         {0,0}, /* 134 */
 526         {0,0}, /* 150 */
 527         {0,0}, /* 200 */
 528         {7,0x26}, /* 300 */
 529         {6,0x26}, /* 600 */
 530         {5,0x26}, /* 1200 */
 531         {0,0}, /* 1800 */
 532         {4,0x26}, /* 2400 */
 533         {3,0x26}, /* 4800 */
 534         {2,0x26}, /* 9600 */
 535         {1,0x26}, /* 19200 */
 536         {0,0x26}, /* 38400 */
 537         {1,0x38}, /* 57600 */
 538         {0,0x38}, /* 115200 */
 539 };
 540 #else
 541  hw_baud_table[18] = {
 542                  {0,0}, /* 0 */
 543                  {0,0}, /* 50 */
 544                  {0,0}, /* 75 */
 545                  {0,0}, /* 110 */
 546                  {0,0}, /* 134 */
 547                  {0,0}, /* 150 */
 548                  {0,0}, /* 200 */
 549                  {0,0}, /* 300 */
 550                  {7,0x26}, /* 600 */
 551                  {6,0x26}, /* 1200 */
 552                  {0,0}, /* 1800 */
 553                  {5,0x26}, /* 2400 */
 554                  {4,0x26}, /* 4800 */
 555                  {3,0x26}, /* 9600 */
 556                  {2,0x26}, /* 19200 */
 557                  {1,0x26}, /* 38400 */
 558                  {0,0x26}, /* 57600 */
 559                  {1,0x38}, /* 115200 */
 560 };
 561 #endif
 562 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
 563
 564 /*
 565  * This routine is called to set the UART divisor registers to match
 566  * the specified baud rate for a serial port.
 567  */
 568 static void change_speed(struct m68k_serial *info)
 569 {
 570         m68328_uart *uart = &uart_addr[info->line];
 571         unsigned short port;
 572         unsigned short ustcnt;
 573         unsigned cflag;
 574         int     i;
 575
 576         if (!info->port.tty || !info->port.tty->termios)
 577                 return;
 578         cflag = info->port.tty->termios->c_cflag;
 579         if (!(port = info->port))
 580                 return;
 581
 582         ustcnt = uart->ustcnt;
 583         uart->ustcnt = ustcnt & ~USTCNT_TXEN;
 584
 585         i = cflag & CBAUD;
 586         if (i & CBAUDEX) {
 587                 i = (i & ~CBAUDEX) + B38400;
 588         }
 589
 590         info->baud = baud_table[i];
 591         uart->ubaud = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
 592                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
 593
 594         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
 595
 596         if ((cflag & CSIZE) == CS8)
 597                 ustcnt |= USTCNT_8_7;
 598
 599         if (cflag & CSTOPB)
 600                 ustcnt |= USTCNT_STOP;
 601
 602         if (cflag & PARENB)
 603                 ustcnt |= USTCNT_PARITYEN;
 604         if (cflag & PARODD)
 605                 ustcnt |= USTCNT_ODD_EVEN;
 606
 607 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 608         if (cflag & CRTSCTS) {
 609                 uart->utx.w &= ~ UTX_NOCTS;
 610         } else {
 611                 uart->utx.w |= UTX_NOCTS;
 612         }
 613 #endif
 614
 615         ustcnt |= USTCNT_TXEN;
 616
 617         uart->ustcnt = ustcnt;
 618         return;
 619 }
 620
 621 /*
 622  * Fair output driver allows a process to speak.
 623  */
 624 static void rs_fair_output(void)
 625 {
 626         int left;               /* Output no more than that */
 627         unsigned long flags;
 628         struct m68k_serial *info = &m68k_soft[0];
 629         char c;
 630
 631         if (info == 0) return;
 632         if (info->xmit_buf == 0) return;
 633
 634         local_irq_save(flags);
 635         left = info->xmit_cnt;
 636         while (left != 0) {
 637                 c = info->xmit_buf[info->xmit_tail];
 638                 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
 639                 info->xmit_cnt--;
 640                 local_irq_restore(flags);
 641
 642                 rs_put_char(c);
 643
 644                 local_irq_save(flags);
 645                 left = min(info->xmit_cnt, left-1);
 646         }
 647
 648         /* Last character is being transmitted now (hopefully). */
 649         udelay(5);
 650
 651         local_irq_restore(flags);
 652         return;
 653 }
 654
 655 /*
 656  * m68k_console_print is registered for printk.
 657  */
 658 void console_print_68328(const char *p)
 659 {
 660         char c;
 661
 662         while((c=*(p++)) != 0) {
 663                 if(c == '\n')
 664                         rs_put_char('\r');
 665                 rs_put_char(c);
 666         }
 667
 668         /* Comment this if you want to have a strict interrupt-driven output */
 669         rs_fair_output();
 670
 671         return;
 672 }
 673
 674 static void rs_set_ldisc(struct tty_struct *tty)
 675 {
 676         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 677
 678         if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
 679                 return;
 680
 681         info->is_cons = (tty->termios->c_line == N_TTY);
 682
 683         printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
 684 }
 685
 686 static void rs_flush_chars(struct tty_struct *tty)
 687 {
 688         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 689         m68328_uart *uart = &uart_addr[info->line];
 690         unsigned long flags;
 691
 692         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 693                 return;
 694 #ifndef USE_INTS
 695         for(;;) {
 696 #endif
 697
 698         /* Enable transmitter */
 699         local_irq_save(flags);
 700
 701         if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
 702                         !info->xmit_buf) {
 703                 local_irq_restore(flags);
 704                 return;
 705         }
 706
 707 #ifdef USE_INTS
 708         uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 709 #else
 710         uart->ustcnt |= USTCNT_TXEN;
 711 #endif
 712
 713 #ifdef USE_INTS
 714         if (uart->utx.w & UTX_TX_AVAIL) {
 715 #else
 716         if (1) {
 717 #endif
 718                 /* Send char */
 719                 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 720                 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 721                 info->xmit_cnt--;
 722         }
 723
 724 #ifndef USE_INTS
 725         while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 726         }
 727 #endif
 728         local_irq_restore(flags);
 729 }
 730
 731 extern void console_printn(const char * b, int count);
 732
 733 static int rs_write(struct tty_struct * tty,
 734                     const unsigned char *buf, int count)
 735 {
 736         int     c, total = 0;
 737         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 738         m68328_uart *uart = &uart_addr[info->line];
 739         unsigned long flags;
 740
 741         if (serial_paranoia_check(info, tty->name, "rs_write"))
 742                 return 0;
 743
 744         if (!tty || !info->xmit_buf)
 745                 return 0;
 746
 747         local_save_flags(flags);
 748         while (1) {
 749                 local_irq_disable();
 750                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
 751                                    SERIAL_XMIT_SIZE - info->xmit_head));
 752                 local_irq_restore(flags);
 753
 754                 if (c <= 0)
 755                         break;
 756
 757                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
 758
 759                 local_irq_disable();
 760                 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
 761                 info->xmit_cnt += c;
 762                 local_irq_restore(flags);
 763                 buf += c;
 764                 count -= c;
 765                 total += c;
 766         }
 767
 768         if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
 769                 /* Enable transmitter */
 770                 local_irq_disable();
 771 #ifndef USE_INTS
 772                 while(info->xmit_cnt) {
 773 #endif
 774
 775                 uart->ustcnt |= USTCNT_TXEN;
 776 #ifdef USE_INTS
 777                 uart->ustcnt |= USTCNT_TX_INTR_MASK;
 778 #else
 779                 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 780 #endif
 781                 if (uart->utx.w & UTX_TX_AVAIL) {
 782                         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 783                         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 784                         info->xmit_cnt--;
 785                 }
 786
 787 #ifndef USE_INTS
 788                 }
 789 #endif
 790                 local_irq_restore(flags);
 791         }
 792
 793         return total;
 794 }
 795
 796 static int rs_write_room(struct tty_struct *tty)
 797 {
 798         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 799         int     ret;
 800
 801         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 802                 return 0;
 803         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
 804         if (ret < 0)
 805                 ret = 0;
 806         return ret;
 807 }
 808
 809 static int rs_chars_in_buffer(struct tty_struct *tty)
 810 {
 811         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 812
 813         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 814                 return 0;
 815         return info->xmit_cnt;
 816 }
 817
 818 static void rs_flush_buffer(struct tty_struct *tty)
 819 {
 820         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 821         unsigned long flags;
 822
 823         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 824                 return;
 825         local_irq_save(flags);
 826         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 827         local_irq_restore(flags);
 828         tty_wakeup(tty);
 829 }
 830
 831 /*
 832  * ------------------------------------------------------------
 833  * rs_throttle()
 834  *
 835  * This routine is called by the upper-layer tty layer to signal that
 836  * incoming characters should be throttled.
 837  * ------------------------------------------------------------
 838  */
 839 static void rs_throttle(struct tty_struct * tty)
 840 {
 841         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 842
 843         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 844                 return;
 845
 846         if (I_IXOFF(tty))
 847                 info->x_char = STOP_CHAR(tty);
 848
 849         /* Turn off RTS line (do this atomic) */
 850 }
 851
 852 static void rs_unthrottle(struct tty_struct * tty)
 853 {
 854         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 855
 856         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
 857                 return;
 858
 859         if (I_IXOFF(tty)) {
 860                 if (info->x_char)
 861                         info->x_char = 0;
 862                 else
 863                         info->x_char = START_CHAR(tty);
 864         }
 865
 866         /* Assert RTS line (do this atomic) */
 867 }
 868
 869 /*
 870  * ------------------------------------------------------------
 871  * rs_ioctl() and friends
 872  * ------------------------------------------------------------
 873  */
 874
 875 static int get_serial_info(struct m68k_serial * info,
 876                            struct serial_struct * retinfo)
 877 {
 878         struct serial_struct tmp;
 879
 880         if (!retinfo)
 881                 return -EFAULT;
 882         memset(&tmp, 0, sizeof(tmp));
 883         tmp.type = info->type;
 884         tmp.line = info->line;
 885         tmp.port = info->port;
 886         tmp.irq = info->irq;
 887         tmp.flags = info->flags;
 888         tmp.baud_base = info->baud_base;
 889         tmp.close_delay = info->close_delay;
 890         tmp.closing_wait = info->closing_wait;
 891         tmp.custom_divisor = info->custom_divisor;
 892         copy_to_user(retinfo,&tmp,sizeof(*retinfo));
 893         return 0;
 894 }
 895
 896 static int set_serial_info(struct m68k_serial * info,
 897                            struct serial_struct * new_info)
 898 {
 899         struct serial_struct new_serial;
 900         struct m68k_serial old_info;
 901         int                     retval = 0;
 902
 903         if (!new_info)
 904                 return -EFAULT;
 905         copy_from_user(&new_serial,new_info,sizeof(new_serial));
 906         old_info = *info;
 907
 908         if (!capable(CAP_SYS_ADMIN)) {
 909                 if ((new_serial.baud_base != info->baud_base) ||
 910                     (new_serial.type != info->type) ||
 911                     (new_serial.close_delay != info->close_delay) ||
 912                     ((new_serial.flags & ~S_USR_MASK) !=
 913                      (info->flags & ~S_USR_MASK)))
 914                         return -EPERM;
 915                 info->flags = ((info->flags & ~S_USR_MASK) |
 916                                (new_serial.flags & S_USR_MASK));
 917                 info->custom_divisor = new_serial.custom_divisor;
 918                 goto check_and_exit;
 919         }
 920
 921         if (info->count > 1)
 922                 return -EBUSY;
 923
 924         /*
 925          * OK, past this point, all the error checking has been done.
 926          * At this point, we start making changes.....
 927          */
 928
 929         info->baud_base = new_serial.baud_base;
 930         info->flags = ((info->flags & ~S_FLAGS) |
 931                         (new_serial.flags & S_FLAGS));
 932         info->type = new_serial.type;
 933         info->close_delay = new_serial.close_delay;
 934         info->closing_wait = new_serial.closing_wait;
 935
 936 check_and_exit:
 937         retval = startup(info);
 938         return retval;
 939 }
 940
 941 /*
 942  * get_lsr_info - get line status register info
 943  *
 944  * Purpose: Let user call ioctl() to get info when the UART physically
 945  *          is emptied.  On bus types like RS485, the transmitter must
 946  *          release the bus after transmitting. This must be done when
 947  *          the transmit shift register is empty, not be done when the
 948  *          transmit holding register is empty.  This functionality
 949  *          allows an RS485 driver to be written in user space.
 950  */
 951 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
 952 {
 953 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 954         m68328_uart *uart = &uart_addr[info->line];
 955 #endif
 956         unsigned char status;
 957         unsigned long flags;
 958
 959         local_irq_save(flags);
 960 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 961         status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
 962 #else
 963         status = 0;
 964 #endif
 965         local_irq_restore(flags);
 966         put_user(status,value);
 967         return 0;
 968 }
 969
 970 /*
 971  * This routine sends a break character out the serial port.
 972  */
 973 static void send_break(struct m68k_serial * info, unsigned int duration)
 974 {
 975         m68328_uart *uart = &uart_addr[info->line];
 976         unsigned long flags;
 977         if (!info->port)
 978                 return;
 979         local_irq_save(flags);
 980 #ifdef USE_INTS
 981         uart->utx.w |= UTX_SEND_BREAK;
 982         msleep_interruptible(duration);
 983         uart->utx.w &= ~UTX_SEND_BREAK;
 984 #endif
 985         local_irq_restore(flags);
 986 }
 987
 988 static int rs_ioctl(struct tty_struct *tty, struct file * file,
 989                     unsigned int cmd, unsigned long arg)
 990 {
 991         int error;
 992         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
 993         int retval;
 994
 995         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
 996                 return -ENODEV;
 997
 998         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 999             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
1000             (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1001                 if (tty->flags & (1 << TTY_IO_ERROR))
1002                     return -EIO;
1003         }
1004
1005         switch (cmd) {
1006                 case TCSBRK:    /* SVID version: non-zero arg --> no break */
1007                         retval = tty_check_change(tty);
1008                         if (retval)
1009                                 return retval;
1010                         tty_wait_until_sent(tty, 0);
1011                         if (!arg)
1012                                 send_break(info, 250);  /* 1/4 second */
1013                         return 0;
1014                 case TCSBRKP:   /* support for POSIX tcsendbreak() */
1015                         retval = tty_check_change(tty);
1016                         if (retval)
1017                                 return retval;
1018                         tty_wait_until_sent(tty, 0);
1019                         send_break(info, arg ? arg*(100) : 250);
1020                         return 0;
1021                 case TIOCGSERIAL:
1022                         if (access_ok(VERIFY_WRITE, (void *) arg,
1023                                                 sizeof(struct serial_struct)))
1024                                 return get_serial_info(info,
1025                                                (struct serial_struct *) arg);
1026                         return -EFAULT;
1027                 case TIOCSSERIAL:
1028                         return set_serial_info(info,
1029                                                (struct serial_struct *) arg);
1030                 case TIOCSERGETLSR: /* Get line status register */
1031                         if (access_ok(VERIFY_WRITE, (void *) arg,
1032                                                 sizeof(unsigned int)))
1033                                 return get_lsr_info(info, (unsigned int *) arg);
1034                         return -EFAULT;
1035                 case TIOCSERGSTRUCT:
1036                         if (!access_ok(VERIFY_WRITE, (void *) arg,
1037                                                 sizeof(struct m68k_serial)))
1038                                 return -EFAULT;
1039                         copy_to_user((struct m68k_serial *) arg,
1040                                     info, sizeof(struct m68k_serial));
1041                         return 0;
1042
1043                 default:
1044                         return -ENOIOCTLCMD;
1045                 }
1046         return 0;
1047 }
1048
1049 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1050 {
1051         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1052
1053         change_speed(info);
1054
1055         if ((old_termios->c_cflag & CRTSCTS) &&
1056             !(tty->termios->c_cflag & CRTSCTS)) {
1057                 tty->hw_stopped = 0;
1058                 rs_start(tty);
1059         }
1060
1061 }
1062
1063 /*
1064  * ------------------------------------------------------------
1065  * rs_close()
1066  *
1067  * This routine is called when the serial port gets closed.  First, we
1068  * wait for the last remaining data to be sent.  Then, we unlink its
1069  * S structure from the interrupt chain if necessary, and we free
1070  * that IRQ if nothing is left in the chain.
1071  * ------------------------------------------------------------
1072  */
1073 static void rs_close(struct tty_struct *tty, struct file * filp)
1074 {
1075         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1076         m68328_uart *uart = &uart_addr[info->line];
1077         unsigned long flags;
1078
1079         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1080                 return;
1081
1082         local_irq_save(flags);
1083
1084         if (tty_hung_up_p(filp)) {
1085                 local_irq_restore(flags);
1086                 return;
1087         }
1088
1089         if ((tty->count == 1) && (info->count != 1)) {
1090                 /*
1091                  * Uh, oh.  tty->count is 1, which means that the tty
1092                  * structure will be freed.  Info->count should always
1093                  * be one in these conditions.  If it's greater than
1094                  * one, we've got real problems, since it means the
1095                  * serial port won't be shutdown.
1096                  */
1097                 printk("rs_close: bad serial port count; tty->count is 1, "
1098                        "info->count is %d\n", info->count);
1099                 info->count = 1;
1100         }
1101         if (--info->count < 0) {
1102                 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1103                        info->line, info->count);
1104                 info->count = 0;
1105         }
1106         if (info->count) {
1107                 local_irq_restore(flags);
1108                 return;
1109         }
1110         info->flags |= S_CLOSING;
1111         /*
1112          * Now we wait for the transmit buffer to clear; and we notify
1113          * the line discipline to only process XON/XOFF characters.
1114          */
1115         tty->closing = 1;
1116         if (info->closing_wait != S_CLOSING_WAIT_NONE)
1117                 tty_wait_until_sent(tty, info->closing_wait);
1118         /*
1119          * At this point we stop accepting input.  To do this, we
1120          * disable the receive line status interrupts, and tell the
1121          * interrupt driver to stop checking the data ready bit in the
1122          * line status register.
1123          */
1124
1125         uart->ustcnt &= ~USTCNT_RXEN;
1126         uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1127
1128         shutdown(info);
1129         rs_flush_buffer(tty);
1130
1131         tty_ldisc_flush(tty);
1132         tty->closing = 0;
1133         info->event = 0;
1134         info->port.tty = NULL;
1135 #warning "This is not and has never been valid so fix it"
1136 #if 0
1137         if (tty->ldisc.num != ldiscs[N_TTY].num) {
1138                 if (tty->ldisc.close)
1139                         (tty->ldisc.close)(tty);
1140                 tty->ldisc = ldiscs[N_TTY];
1141                 tty->termios->c_line = N_TTY;
1142                 if (tty->ldisc.open)
1143                         (tty->ldisc.open)(tty);
1144         }
1145 #endif
1146         if (info->blocked_open) {
1147                 if (info->close_delay) {
1148                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1149                 }
1150                 wake_up_interruptible(&info->open_wait);
1151         }
1152         info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1153         wake_up_interruptible(&info->close_wait);
1154         local_irq_restore(flags);
1155 }
1156
1157 /*
1158  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1159  */
1160 void rs_hangup(struct tty_struct *tty)
1161 {
1162         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1163
1164         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1165                 return;
1166
1167         rs_flush_buffer(tty);
1168         shutdown(info);
1169         info->event = 0;
1170         info->count = 0;
1171         info->flags &= ~S_NORMAL_ACTIVE;
1172         info->port.tty = NULL;
1173         wake_up_interruptible(&info->open_wait);
1174 }
1175
1176 /*
1177  * ------------------------------------------------------------
1178  * rs_open() and friends
1179  * ------------------------------------------------------------
1180  */
1181 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1182                            struct m68k_serial *info)
1183 {
1184         DECLARE_WAITQUEUE(wait, current);
1185         int             retval;
1186         int             do_clocal = 0;
1187
1188         /*
1189          * If the device is in the middle of being closed, then block
1190          * until it's done, and then try again.
1191          */
1192         if (info->flags & S_CLOSING) {
1193                 interruptible_sleep_on(&info->close_wait);
1194 #ifdef SERIAL_DO_RESTART
1195                 if (info->flags & S_HUP_NOTIFY)
1196                         return -EAGAIN;
1197                 else
1198                         return -ERESTARTSYS;
1199 #else
1200                 return -EAGAIN;
1201 #endif
1202         }
1203
1204         /*
1205          * If non-blocking mode is set, or the port is not enabled,
1206          * then make the check up front and then exit.
1207          */
1208         if ((filp->f_flags & O_NONBLOCK) ||
1209             (tty->flags & (1 << TTY_IO_ERROR))) {
1210                 info->flags |= S_NORMAL_ACTIVE;
1211                 return 0;
1212         }
1213
1214         if (tty->termios->c_cflag & CLOCAL)
1215                 do_clocal = 1;
1216
1217         /*
1218          * Block waiting for the carrier detect and the line to become
1219          * free (i.e., not in use by the callout).  While we are in
1220          * this loop, info->count is dropped by one, so that
1221          * rs_close() knows when to free things.  We restore it upon
1222          * exit, either normal or abnormal.
1223          */
1224         retval = 0;
1225         add_wait_queue(&info->open_wait, &wait);
1226
1227         info->count--;
1228         info->blocked_open++;
1229         while (1) {
1230                 local_irq_disable();
1231                 m68k_rtsdtr(info, 1);
1232                 local_irq_enable();
1233                 current->state = TASK_INTERRUPTIBLE;
1234                 if (tty_hung_up_p(filp) ||
1235                     !(info->flags & S_INITIALIZED)) {
1236 #ifdef SERIAL_DO_RESTART
1237                         if (info->flags & S_HUP_NOTIFY)
1238                                 retval = -EAGAIN;
1239                         else
1240                                 retval = -ERESTARTSYS;
1241 #else
1242                         retval = -EAGAIN;
1243 #endif
1244                         break;
1245                 }
1246                 if (!(info->flags & S_CLOSING) && do_clocal)
1247                         break;
1248                 if (signal_pending(current)) {
1249                         retval = -ERESTARTSYS;
1250                         break;
1251                 }
1252                 schedule();
1253         }
1254         current->state = TASK_RUNNING;
1255         remove_wait_queue(&info->open_wait, &wait);
1256         if (!tty_hung_up_p(filp))
1257                 info->count++;
1258         info->blocked_open--;
1259
1260         if (retval)
1261                 return retval;
1262         info->flags |= S_NORMAL_ACTIVE;
1263         return 0;
1264 }
1265
1266 /*
1267  * This routine is called whenever a serial port is opened.  It
1268  * enables interrupts for a serial port, linking in its S structure into
1269  * the IRQ chain.   It also performs the serial-specific
1270  * initialization for the tty structure.
1271  */
1272 int rs_open(struct tty_struct *tty, struct file * filp)
1273 {
1274         struct m68k_serial      *info;
1275         int                     retval, line;
1276
1277         line = tty->index;
1278
1279         if (line >= NR_PORTS || line < 0) /* we have exactly one */
1280                 return -ENODEV;
1281
1282         info = &m68k_soft[line];
1283
1284         if (serial_paranoia_check(info, tty->name, "rs_open"))
1285                 return -ENODEV;
1286
1287         info->count++;
1288         tty->driver_data = info;
1289         info->port.tty = tty;
1290
1291         /*
1292          * Start up serial port
1293          */
1294         retval = startup(info);
1295         if (retval)
1296                 return retval;
1297
1298         return block_til_ready(tty, filp, info);
1299 }
1300
1301 /* Finally, routines used to initialize the serial driver. */
1302
1303 static void show_serial_version(void)
1304 {
1305         printk("MC68328 serial driver version 1.00\n");
1306 }
1307
1308 static const struct tty_operations rs_ops = {
1309         .open = rs_open,
1310         .close = rs_close,
1311         .write = rs_write,
1312         .flush_chars = rs_flush_chars,
1313         .write_room = rs_write_room,
1314         .chars_in_buffer = rs_chars_in_buffer,
1315         .flush_buffer = rs_flush_buffer,
1316         .ioctl = rs_ioctl,
1317         .throttle = rs_throttle,
1318         .unthrottle = rs_unthrottle,
1319         .set_termios = rs_set_termios,
1320         .stop = rs_stop,
1321         .start = rs_start,
1322         .hangup = rs_hangup,
1323         .set_ldisc = rs_set_ldisc,
1324 };
1325
1326 /* rs_init inits the driver */
1327 static int __init
1328 rs68328_init(void)
1329 {
1330         int flags, i;
1331         struct m68k_serial *info;
1332
1333         serial_driver = alloc_tty_driver(NR_PORTS);
1334         if (!serial_driver)
1335                 return -ENOMEM;
1336
1337         show_serial_version();
1338
1339         /* Initialize the tty_driver structure */
1340         /* SPARC: Not all of this is exactly right for us. */
1341
1342         serial_driver->name = "ttyS";
1343         serial_driver->major = TTY_MAJOR;
1344         serial_driver->minor_start = 64;
1345         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1346         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1347         serial_driver->init_termios = tty_std_termios;
1348         serial_driver->init_termios.c_cflag =
1349                         m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1350         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1351         tty_set_operations(serial_driver, &rs_ops);
1352
1353         if (tty_register_driver(serial_driver)) {
1354                 put_tty_driver(serial_driver);
1355                 printk(KERN_ERR "Couldn't register serial driver\n");
1356                 return -ENOMEM;
1357         }
1358
1359         local_irq_save(flags);
1360
1361         for(i=0;i<NR_PORTS;i++) {
1362
1363             info = &m68k_soft[i];
1364             info->magic = SERIAL_MAGIC;
1365             info->port = (int) &uart_addr[i];
1366             info->port.tty = NULL;
1367             info->irq = uart_irqs[i];
1368             info->custom_divisor = 16;
1369             info->close_delay = 50;
1370             info->closing_wait = 3000;
1371             info->x_char = 0;
1372             info->event = 0;
1373             info->count = 0;
1374             info->blocked_open = 0;
1375             INIT_WORK(&info->tqueue, do_softint);
1376             INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1377             init_waitqueue_head(&info->open_wait);
1378             init_waitqueue_head(&info->close_wait);
1379             info->line = i;
1380             info->is_cons = 1; /* Means shortcuts work */
1381
1382             printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1383                    info->port, info->irq);
1384             printk(" is a builtin MC68328 UART\n");
1385
1386             IRQ_ports[info->irq] = info;        /* waste of space */
1387
1388 #ifdef CONFIG_M68VZ328
1389                 if (i > 0 )
1390                         PJSEL &= 0xCF;  /* PSW enable second port output */
1391 #endif
1392
1393             if (request_irq(uart_irqs[i],
1394                             rs_interrupt,
1395                             IRQF_DISABLED,
1396                             "M68328_UART", NULL))
1397                 panic("Unable to attach 68328 serial interrupt\n");
1398         }
1399         local_irq_restore(flags);
1400         return 0;
1401 }
1402
1403 module_init(rs68328_init);
1404
1405
1406
1407 static void m68328_set_baud(void)
1408 {
1409         unsigned short ustcnt;
1410         int     i;
1411
1412         ustcnt = USTCNT;
1413         USTCNT = ustcnt & ~USTCNT_TXEN;
1414
1415 again:
1416         for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++)
1417                 if (baud_table[i] == m68328_console_baud)
1418                         break;
1419         if (i >= sizeof(baud_table) / sizeof(baud_table[0])) {
1420                 m68328_console_baud = 9600;
1421                 goto again;
1422         }
1423
1424         UBAUD = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
1425                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1426         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1427         ustcnt |= USTCNT_8_7;
1428         ustcnt |= USTCNT_TXEN;
1429         USTCNT = ustcnt;
1430         m68328_console_initted = 1;
1431         return;
1432 }
1433
1434
1435 int m68328_console_setup(struct console *cp, char *arg)
1436 {
1437         int             i, n = CONSOLE_BAUD_RATE;
1438
1439         if (!cp)
1440                 return(-1);
1441
1442         if (arg)
1443                 n = simple_strtoul(arg,NULL,0);
1444
1445         for (i = 0; i < BAUD_TABLE_SIZE; i++)
1446                 if (baud_table[i] == n)
1447                         break;
1448         if (i < BAUD_TABLE_SIZE) {
1449                 m68328_console_baud = n;
1450                 m68328_console_cbaud = 0;
1451                 if (i > 15) {
1452                         m68328_console_cbaud |= CBAUDEX;
1453                         i -= 15;
1454                 }
1455                 m68328_console_cbaud |= i;
1456         }
1457
1458         m68328_set_baud(); /* make sure baud rate changes */
1459         return(0);
1460 }
1461
1462
1463 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1464 {
1465         *index = c->index;
1466         return serial_driver;
1467 }
1468
1469
1470 void m68328_console_write (struct console *co, const char *str,
1471                            unsigned int count)
1472 {
1473         if (!m68328_console_initted)
1474                 m68328_set_baud();
1475     while (count--) {
1476         if (*str == '\n')
1477            rs_put_char('\r');
1478         rs_put_char( *str++ );
1479     }
1480 }
1481
1482
1483 static struct console m68328_driver = {
1484         .name           = "ttyS",
1485         .write          = m68328_console_write,
1486         .device         = m68328_console_device,
1487         .setup          = m68328_console_setup,
1488         .flags          = CON_PRINTBUFFER,
1489         .index          = -1,
1490 };
1491
1492
1493 static int __init m68328_console_init(void)
1494 {
1495         register_console(&m68328_driver);
1496         return 0;
1497 }
1498
1499 console_initcall(m68328_console_init);