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 /* serial subtype definitions */
  88 #define SERIAL_TYPE_NORMAL      1
  89
  90 /* number of characters left in xmit buffer before we ask for more */
  91 #define WAKEUP_CHARS 256
  92
  93 /* Debugging... DEBUG_INTR is bad to use when one of the zs
  94  * lines is your console ;(
  95  */
  96 #undef SERIAL_DEBUG_INTR
  97 #undef SERIAL_DEBUG_OPEN
  98 #undef SERIAL_DEBUG_FLOW
  99
 100 #define RS_ISR_PASS_LIMIT 256
 101
 102 static void change_speed(struct m68k_serial *info);
 103
 104 /*
 105  *      Setup for console. Argument comes from the boot command line.
 106  */
 107
 108 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
 109 #define CONSOLE_BAUD_RATE       115200
 110 #define DEFAULT_CBAUD           B115200
 111 #else
 112         /* (es) */
 113         /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
 114         #ifdef CONFIG_M68VZ328
 115         #define CONSOLE_BAUD_RATE       19200
 116         #define DEFAULT_CBAUD           B19200
 117         #endif
 118         /* (/es) */
 119 #endif
 120
 121 #ifndef CONSOLE_BAUD_RATE
 122 #define CONSOLE_BAUD_RATE       9600
 123 #define DEFAULT_CBAUD           B9600
 124 #endif
 125
 126
 127 static int m68328_console_initted = 0;
 128 static int m68328_console_baud    = CONSOLE_BAUD_RATE;
 129 static int m68328_console_cbaud   = DEFAULT_CBAUD;
 130
 131
 132 static inline int serial_paranoia_check(struct m68k_serial *info,
 133                                         char *name, const char *routine)
 134 {
 135 #ifdef SERIAL_PARANOIA_CHECK
 136         static const char *badmagic =
 137                 "Warning: bad magic number for serial struct %s in %s\n";
 138         static const char *badinfo =
 139                 "Warning: null m68k_serial for %s in %s\n";
 140
 141         if (!info) {
 142                 printk(badinfo, name, routine);
 143                 return 1;
 144         }
 145         if (info->magic != SERIAL_MAGIC) {
 146                 printk(badmagic, name, routine);
 147                 return 1;
 148         }
 149 #endif
 150         return 0;
 151 }
 152
 153 /*
 154  * This is used to figure out the divisor speeds and the timeouts
 155  */
 156 static int baud_table[] = {
 157         0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
 158         9600, 19200, 38400, 57600, 115200, 0 };
 159
 160 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
 161
 162 /* Sets or clears DTR/RTS on the requested line */
 163 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
 164 {
 165         if (set) {
 166                 /* set the RTS/CTS line */
 167         } else {
 168                 /* clear it */
 169         }
 170         return;
 171 }
 172
 173 /* Utility routines */
 174 static inline int get_baud(struct m68k_serial *ss)
 175 {
 176         unsigned long result = 115200;
 177         unsigned short int baud = uart_addr[ss->line].ubaud;
 178         if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
 179         result >>= GET_FIELD(baud, UBAUD_DIVIDE);
 180
 181         return result;
 182 }
 183
 184 /*
 185  * ------------------------------------------------------------
 186  * rs_stop() and rs_start()
 187  *
 188  * This routines are called before setting or resetting tty->stopped.
 189  * They enable or disable transmitter interrupts, as necessary.
 190  * ------------------------------------------------------------
 191  */
 192 static void rs_stop(struct tty_struct *tty)
 193 {
 194         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 195         m68328_uart *uart = &uart_addr[info->line];
 196         unsigned long flags;
 197
 198         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 199                 return;
 200
 201         local_irq_save(flags);
 202         uart->ustcnt &= ~USTCNT_TXEN;
 203         local_irq_restore(flags);
 204 }
 205
 206 static void rs_put_char(char ch)
 207 {
 208         int flags, loops = 0;
 209
 210         local_irq_save(flags);
 211
 212         while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
 213                 loops++;
 214                 udelay(5);
 215         }
 216
 217         UTX_TXDATA = ch;
 218         udelay(5);
 219         local_irq_restore(flags);
 220 }
 221
 222 static void rs_start(struct tty_struct *tty)
 223 {
 224         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 225         m68328_uart *uart = &uart_addr[info->line];
 226         unsigned long flags;
 227
 228         if (serial_paranoia_check(info, tty->name, "rs_start"))
 229                 return;
 230
 231         local_irq_save(flags);
 232         if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
 233 #ifdef USE_INTS
 234                 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 235 #else
 236                 uart->ustcnt |= USTCNT_TXEN;
 237 #endif
 238         }
 239         local_irq_restore(flags);
 240 }
 241
 242 /* Drop into either the boot monitor or kadb upon receiving a break
 243  * from keyboard/console input.
 244  */
 245 static void batten_down_hatches(void)
 246 {
 247         /* Drop into the debugger */
 248 }
 249
 250 static void status_handle(struct m68k_serial *info, unsigned short status)
 251 {
 252 #if 0
 253         if(status & DCD) {
 254                 if((info->tty->termios->c_cflag & CRTSCTS) &&
 255                    ((info->curregs[3] & AUTO_ENAB)==0)) {
 256                         info->curregs[3] |= AUTO_ENAB;
 257                         info->pendregs[3] |= AUTO_ENAB;
 258                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 259                 }
 260         } else {
 261                 if((info->curregs[3] & AUTO_ENAB)) {
 262                         info->curregs[3] &= ~AUTO_ENAB;
 263                         info->pendregs[3] &= ~AUTO_ENAB;
 264                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 265                 }
 266         }
 267 #endif
 268         /* If this is console input and this is a
 269          * 'break asserted' status change interrupt
 270          * see if we can drop into the debugger
 271          */
 272         if((status & URX_BREAK) && info->break_abort)
 273                 batten_down_hatches();
 274         return;
 275 }
 276
 277 static void receive_chars(struct m68k_serial *info, unsigned short rx)
 278 {
 279         struct tty_struct *tty = info->tty;
 280         m68328_uart *uart = &uart_addr[info->line];
 281         unsigned char ch, flag;
 282
 283         /*
 284          * This do { } while() loop will get ALL chars out of Rx FIFO
 285          */
 286 #ifndef CONFIG_XCOPILOT_BUGS
 287         do {
 288 #endif
 289                 ch = GET_FIELD(rx, URX_RXDATA);
 290
 291                 if(info->is_cons) {
 292                         if(URX_BREAK & rx) { /* whee, break received */
 293                                 status_handle(info, rx);
 294                                 return;
 295 #ifdef CONFIG_MAGIC_SYSRQ
 296                         } else if (ch == 0x10) { /* ^P */
 297                                 show_state();
 298                                 show_free_areas();
 299                                 show_buffers();
 300 /*                              show_net_buffers(); */
 301                                 return;
 302                         } else if (ch == 0x12) { /* ^R */
 303                                 emergency_restart();
 304                                 return;
 305 #endif /* CONFIG_MAGIC_SYSRQ */
 306                         }
 307                         /* It is a 'keyboard interrupt' ;-) */
 308 #ifdef CONFIG_CONSOLE
 309                         wake_up(&keypress_wait);
 310 #endif
 311                 }
 312
 313                 if(!tty)
 314                         goto clear_and_exit;
 315
 316                 flag = TTY_NORMAL;
 317
 318                 if(rx & URX_PARITY_ERROR) {
 319                         flag = TTY_PARITY;
 320                         status_handle(info, rx);
 321                 } else if(rx & URX_OVRUN) {
 322                         flag = TTY_OVERRUN;
 323                         status_handle(info, rx);
 324                 } else if(rx & URX_FRAME_ERROR) {
 325                         flag = TTY_FRAME;
 326                         status_handle(info, rx);
 327                 }
 328                 tty_insert_flip_char(tty, ch, flag);
 329 #ifndef CONFIG_XCOPILOT_BUGS
 330         } while((rx = uart->urx.w) & URX_DATA_READY);
 331 #endif
 332
 333         tty_schedule_flip(tty);
 334
 335 clear_and_exit:
 336         return;
 337 }
 338
 339 static void transmit_chars(struct m68k_serial *info)
 340 {
 341         m68328_uart *uart = &uart_addr[info->line];
 342
 343         if (info->x_char) {
 344                 /* Send next char */
 345                 uart->utx.b.txdata = info->x_char;
 346                 info->x_char = 0;
 347                 goto clear_and_return;
 348         }
 349
 350         if((info->xmit_cnt <= 0) || info->tty->stopped) {
 351                 /* That's peculiar... TX ints off */
 352                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 353                 goto clear_and_return;
 354         }
 355
 356         /* Send char */
 357         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 358         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 359         info->xmit_cnt--;
 360
 361         if (info->xmit_cnt < WAKEUP_CHARS)
 362                 schedule_work(&info->tqueue);
 363
 364         if(info->xmit_cnt <= 0) {
 365                 /* All done for now... TX ints off */
 366                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 367                 goto clear_and_return;
 368         }
 369
 370 clear_and_return:
 371         /* Clear interrupt (should be auto)*/
 372         return;
 373 }
 374
 375 /*
 376  * This is the serial driver's generic interrupt routine
 377  */
 378 irqreturn_t rs_interrupt(int irq, void *dev_id)
 379 {
 380         struct m68k_serial * info;
 381         m68328_uart *uart;
 382         unsigned short rx;
 383         unsigned short tx;
 384
 385         info = IRQ_ports[irq];
 386         if(!info)
 387             return IRQ_NONE;
 388
 389         uart = &uart_addr[info->line];
 390         rx = uart->urx.w;
 391
 392 #ifdef USE_INTS
 393         tx = uart->utx.w;
 394
 395         if (rx & URX_DATA_READY) receive_chars(info, rx);
 396         if (tx & UTX_TX_AVAIL)   transmit_chars(info);
 397 #else
 398         receive_chars(info, rx);
 399 #endif
 400         return IRQ_HANDLED;
 401 }
 402
 403 static void do_softint(struct work_struct *work)
 404 {
 405         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue);
 406         struct tty_struct       *tty;
 407
 408         tty = info->tty;
 409         if (!tty)
 410                 return;
 411 #if 0
 412         if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
 413                 tty_wakeup(tty);
 414         }
 415 #endif
 416 }
 417
 418 /*
 419  * This routine is called from the scheduler tqueue when the interrupt
 420  * routine has signalled that a hangup has occurred.  The path of
 421  * hangup processing is:
 422  *
 423  *      serial interrupt routine -> (scheduler tqueue) ->
 424  *      do_serial_hangup() -> tty->hangup() -> rs_hangup()
 425  *
 426  */
 427 static void do_serial_hangup(struct work_struct *work)
 428 {
 429         struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue_hangup);
 430         struct tty_struct       *tty;
 431
 432         tty = info->tty;
 433         if (!tty)
 434                 return;
 435
 436         tty_hangup(tty);
 437 }
 438
 439
 440 static int startup(struct m68k_serial * info)
 441 {
 442         m68328_uart *uart = &uart_addr[info->line];
 443         unsigned long flags;
 444
 445         if (info->flags & S_INITIALIZED)
 446                 return 0;
 447
 448         if (!info->xmit_buf) {
 449                 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
 450                 if (!info->xmit_buf)
 451                         return -ENOMEM;
 452         }
 453
 454         local_irq_save(flags);
 455
 456         /*
 457          * Clear the FIFO buffers and disable them
 458          * (they will be reenabled in change_speed())
 459          */
 460
 461         uart->ustcnt = USTCNT_UEN;
 462         info->xmit_fifo_size = 1;
 463         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
 464         (void)uart->urx.w;
 465
 466         /*
 467          * Finally, enable sequencing and interrupts
 468          */
 469 #ifdef USE_INTS
 470         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
 471                  USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
 472 #else
 473         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
 474 #endif
 475
 476         if (info->tty)
 477                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
 478         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 479
 480         /*
 481          * and set the speed of the serial port
 482          */
 483
 484         change_speed(info);
 485
 486         info->flags |= S_INITIALIZED;
 487         local_irq_restore(flags);
 488         return 0;
 489 }
 490
 491 /*
 492  * This routine will shutdown a serial port; interrupts are disabled, and
 493  * DTR is dropped if the hangup on close termio flag is on.
 494  */
 495 static void shutdown(struct m68k_serial * info)
 496 {
 497         m68328_uart *uart = &uart_addr[info->line];
 498         unsigned long   flags;
 499
 500         uart->ustcnt = 0; /* All off! */
 501         if (!(info->flags & S_INITIALIZED))
 502                 return;
 503
 504         local_irq_save(flags);
 505
 506         if (info->xmit_buf) {
 507                 free_page((unsigned long) info->xmit_buf);
 508                 info->xmit_buf = 0;
 509         }
 510
 511         if (info->tty)
 512                 set_bit(TTY_IO_ERROR, &info->tty->flags);
 513
 514         info->flags &= ~S_INITIALIZED;
 515         local_irq_restore(flags);
 516 }
 517
 518 struct {
 519         int divisor, prescale;
 520 }
 521 #ifndef CONFIG_M68VZ328
 522  hw_baud_table[18] = {
 523         {0,0}, /* 0 */
 524         {0,0}, /* 50 */
 525         {0,0}, /* 75 */
 526         {0,0}, /* 110 */
 527         {0,0}, /* 134 */
 528         {0,0}, /* 150 */
 529         {0,0}, /* 200 */
 530         {7,0x26}, /* 300 */
 531         {6,0x26}, /* 600 */
 532         {5,0x26}, /* 1200 */
 533         {0,0}, /* 1800 */
 534         {4,0x26}, /* 2400 */
 535         {3,0x26}, /* 4800 */
 536         {2,0x26}, /* 9600 */
 537         {1,0x26}, /* 19200 */
 538         {0,0x26}, /* 38400 */
 539         {1,0x38}, /* 57600 */
 540         {0,0x38}, /* 115200 */
 541 };
 542 #else
 543  hw_baud_table[18] = {
 544                  {0,0}, /* 0 */
 545                  {0,0}, /* 50 */
 546                  {0,0}, /* 75 */
 547                  {0,0}, /* 110 */
 548                  {0,0}, /* 134 */
 549                  {0,0}, /* 150 */
 550                  {0,0}, /* 200 */
 551                  {0,0}, /* 300 */
 552                  {7,0x26}, /* 600 */
 553                  {6,0x26}, /* 1200 */
 554                  {0,0}, /* 1800 */
 555                  {5,0x26}, /* 2400 */
 556                  {4,0x26}, /* 4800 */
 557                  {3,0x26}, /* 9600 */
 558                  {2,0x26}, /* 19200 */
 559                  {1,0x26}, /* 38400 */
 560                  {0,0x26}, /* 57600 */
 561                  {1,0x38}, /* 115200 */
 562 };
 563 #endif
 564 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
 565
 566 /*
 567  * This routine is called to set the UART divisor registers to match
 568  * the specified baud rate for a serial port.
 569  */
 570 static void change_speed(struct m68k_serial *info)
 571 {
 572         m68328_uart *uart = &uart_addr[info->line];
 573         unsigned short port;
 574         unsigned short ustcnt;
 575         unsigned cflag;
 576         int     i;
 577
 578         if (!info->tty || !info->tty->termios)
 579                 return;
 580         cflag = info->tty->termios->c_cflag;
 581         if (!(port = info->port))
 582                 return;
 583
 584         ustcnt = uart->ustcnt;
 585         uart->ustcnt = ustcnt & ~USTCNT_TXEN;
 586
 587         i = cflag & CBAUD;
 588         if (i & CBAUDEX) {
 589                 i = (i & ~CBAUDEX) + B38400;
 590         }
 591
 592         info->baud = baud_table[i];
 593         uart->ubaud = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
 594                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
 595
 596         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
 597
 598         if ((cflag & CSIZE) == CS8)
 599                 ustcnt |= USTCNT_8_7;
 600
 601         if (cflag & CSTOPB)
 602                 ustcnt |= USTCNT_STOP;
 603
 604         if (cflag & PARENB)
 605                 ustcnt |= USTCNT_PARITYEN;
 606         if (cflag & PARODD)
 607                 ustcnt |= USTCNT_ODD_EVEN;
 608
 609 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 610         if (cflag & CRTSCTS) {
 611                 uart->utx.w &= ~ UTX_NOCTS;
 612         } else {
 613                 uart->utx.w |= UTX_NOCTS;
 614         }
 615 #endif
 616
 617         ustcnt |= USTCNT_TXEN;
 618
 619         uart->ustcnt = ustcnt;
 620         return;
 621 }
 622
 623 /*
 624  * Fair output driver allows a process to speak.
 625  */
 626 static void rs_fair_output(void)
 627 {
 628         int left;               /* Output no more than that */
 629         unsigned long flags;
 630         struct m68k_serial *info = &m68k_soft[0];
 631         char c;
 632
 633         if (info == 0) return;
 634         if (info->xmit_buf == 0) return;
 635
 636         local_irq_save(flags);
 637         left = info->xmit_cnt;
 638         while (left != 0) {
 639                 c = info->xmit_buf[info->xmit_tail];
 640                 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
 641                 info->xmit_cnt--;
 642                 local_irq_restore(flags);
 643
 644                 rs_put_char(c);
 645
 646                 local_irq_save(flags);
 647                 left = min(info->xmit_cnt, left-1);
 648         }
 649
 650         /* Last character is being transmitted now (hopefully). */
 651         udelay(5);
 652
 653         local_irq_restore(flags);
 654         return;
 655 }
 656
 657 /*
 658  * m68k_console_print is registered for printk.
 659  */
 660 void console_print_68328(const char *p)
 661 {
 662         char c;
 663
 664         while((c=*(p++)) != 0) {
 665                 if(c == '\n')
 666                         rs_put_char('\r');
 667                 rs_put_char(c);
 668         }
 669
 670         /* Comment this if you want to have a strict interrupt-driven output */
 671         rs_fair_output();
 672
 673         return;
 674 }
 675
 676 static void rs_set_ldisc(struct tty_struct *tty)
 677 {
 678         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 679
 680         if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
 681                 return;
 682
 683         info->is_cons = (tty->termios->c_line == N_TTY);
 684
 685         printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
 686 }
 687
 688 static void rs_flush_chars(struct tty_struct *tty)
 689 {
 690         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 691         m68328_uart *uart = &uart_addr[info->line];
 692         unsigned long flags;
 693
 694         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 695                 return;
 696 #ifndef USE_INTS
 697         for(;;) {
 698 #endif
 699
 700         /* Enable transmitter */
 701         local_irq_save(flags);
 702
 703         if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
 704                         !info->xmit_buf) {
 705                 local_irq_restore(flags);
 706                 return;
 707         }
 708
 709 #ifdef USE_INTS
 710         uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 711 #else
 712         uart->ustcnt |= USTCNT_TXEN;
 713 #endif
 714
 715 #ifdef USE_INTS
 716         if (uart->utx.w & UTX_TX_AVAIL) {
 717 #else
 718         if (1) {
 719 #endif
 720                 /* Send char */
 721                 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 722                 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 723                 info->xmit_cnt--;
 724         }
 725
 726 #ifndef USE_INTS
 727         while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 728         }
 729 #endif
 730         local_irq_restore(flags);
 731 }
 732
 733 extern void console_printn(const char * b, int count);
 734
 735 static int rs_write(struct tty_struct * tty,
 736                     const unsigned char *buf, int count)
 737 {
 738         int     c, total = 0;
 739         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 740         m68328_uart *uart = &uart_addr[info->line];
 741         unsigned long flags;
 742
 743         if (serial_paranoia_check(info, tty->name, "rs_write"))
 744                 return 0;
 745
 746         if (!tty || !info->xmit_buf)
 747                 return 0;
 748
 749         local_save_flags(flags);
 750         while (1) {
 751                 local_irq_disable();
 752                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
 753                                    SERIAL_XMIT_SIZE - info->xmit_head));
 754                 local_irq_restore(flags);
 755
 756                 if (c <= 0)
 757                         break;
 758
 759                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
 760
 761                 local_irq_disable();
 762                 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
 763                 info->xmit_cnt += c;
 764                 local_irq_restore(flags);
 765                 buf += c;
 766                 count -= c;
 767                 total += c;
 768         }
 769
 770         if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
 771                 /* Enable transmitter */
 772                 local_irq_disable();
 773 #ifndef USE_INTS
 774                 while(info->xmit_cnt) {
 775 #endif
 776
 777                 uart->ustcnt |= USTCNT_TXEN;
 778 #ifdef USE_INTS
 779                 uart->ustcnt |= USTCNT_TX_INTR_MASK;
 780 #else
 781                 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 782 #endif
 783                 if (uart->utx.w & UTX_TX_AVAIL) {
 784                         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 785                         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 786                         info->xmit_cnt--;
 787                 }
 788
 789 #ifndef USE_INTS
 790                 }
 791 #endif
 792                 local_irq_restore(flags);
 793         }
 794
 795         return total;
 796 }
 797
 798 static int rs_write_room(struct tty_struct *tty)
 799 {
 800         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 801         int     ret;
 802
 803         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 804                 return 0;
 805         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
 806         if (ret < 0)
 807                 ret = 0;
 808         return ret;
 809 }
 810
 811 static int rs_chars_in_buffer(struct tty_struct *tty)
 812 {
 813         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 814
 815         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 816                 return 0;
 817         return info->xmit_cnt;
 818 }
 819
 820 static void rs_flush_buffer(struct tty_struct *tty)
 821 {
 822         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 823         unsigned long flags;
 824
 825         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 826                 return;
 827         local_irq_save(flags);
 828         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 829         local_irq_restore(flags);
 830         tty_wakeup(tty);
 831 }
 832
 833 /*
 834  * ------------------------------------------------------------
 835  * rs_throttle()
 836  *
 837  * This routine is called by the upper-layer tty layer to signal that
 838  * incoming characters should be throttled.
 839  * ------------------------------------------------------------
 840  */
 841 static void rs_throttle(struct tty_struct * tty)
 842 {
 843         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 844
 845         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 846                 return;
 847
 848         if (I_IXOFF(tty))
 849                 info->x_char = STOP_CHAR(tty);
 850
 851         /* Turn off RTS line (do this atomic) */
 852 }
 853
 854 static void rs_unthrottle(struct tty_struct * tty)
 855 {
 856         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 857
 858         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
 859                 return;
 860
 861         if (I_IXOFF(tty)) {
 862                 if (info->x_char)
 863                         info->x_char = 0;
 864                 else
 865                         info->x_char = START_CHAR(tty);
 866         }
 867
 868         /* Assert RTS line (do this atomic) */
 869 }
 870
 871 /*
 872  * ------------------------------------------------------------
 873  * rs_ioctl() and friends
 874  * ------------------------------------------------------------
 875  */
 876
 877 static int get_serial_info(struct m68k_serial * info,
 878                            struct serial_struct * retinfo)
 879 {
 880         struct serial_struct tmp;
 881
 882         if (!retinfo)
 883                 return -EFAULT;
 884         memset(&tmp, 0, sizeof(tmp));
 885         tmp.type = info->type;
 886         tmp.line = info->line;
 887         tmp.port = info->port;
 888         tmp.irq = info->irq;
 889         tmp.flags = info->flags;
 890         tmp.baud_base = info->baud_base;
 891         tmp.close_delay = info->close_delay;
 892         tmp.closing_wait = info->closing_wait;
 893         tmp.custom_divisor = info->custom_divisor;
 894         copy_to_user(retinfo,&tmp,sizeof(*retinfo));
 895         return 0;
 896 }
 897
 898 static int set_serial_info(struct m68k_serial * info,
 899                            struct serial_struct * new_info)
 900 {
 901         struct serial_struct new_serial;
 902         struct m68k_serial old_info;
 903         int                     retval = 0;
 904
 905         if (!new_info)
 906                 return -EFAULT;
 907         copy_from_user(&new_serial,new_info,sizeof(new_serial));
 908         old_info = *info;
 909
 910         if (!capable(CAP_SYS_ADMIN)) {
 911                 if ((new_serial.baud_base != info->baud_base) ||
 912                     (new_serial.type != info->type) ||
 913                     (new_serial.close_delay != info->close_delay) ||
 914                     ((new_serial.flags & ~S_USR_MASK) !=
 915                      (info->flags & ~S_USR_MASK)))
 916                         return -EPERM;
 917                 info->flags = ((info->flags & ~S_USR_MASK) |
 918                                (new_serial.flags & S_USR_MASK));
 919                 info->custom_divisor = new_serial.custom_divisor;
 920                 goto check_and_exit;
 921         }
 922
 923         if (info->count > 1)
 924                 return -EBUSY;
 925
 926         /*
 927          * OK, past this point, all the error checking has been done.
 928          * At this point, we start making changes.....
 929          */
 930
 931         info->baud_base = new_serial.baud_base;
 932         info->flags = ((info->flags & ~S_FLAGS) |
 933                         (new_serial.flags & S_FLAGS));
 934         info->type = new_serial.type;
 935         info->close_delay = new_serial.close_delay;
 936         info->closing_wait = new_serial.closing_wait;
 937
 938 check_and_exit:
 939         retval = startup(info);
 940         return retval;
 941 }
 942
 943 /*
 944  * get_lsr_info - get line status register info
 945  *
 946  * Purpose: Let user call ioctl() to get info when the UART physically
 947  *          is emptied.  On bus types like RS485, the transmitter must
 948  *          release the bus after transmitting. This must be done when
 949  *          the transmit shift register is empty, not be done when the
 950  *          transmit holding register is empty.  This functionality
 951  *          allows an RS485 driver to be written in user space.
 952  */
 953 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
 954 {
 955 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 956         m68328_uart *uart = &uart_addr[info->line];
 957 #endif
 958         unsigned char status;
 959         unsigned long flags;
 960
 961         local_irq_save(flags);
 962 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 963         status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
 964 #else
 965         status = 0;
 966 #endif
 967         local_irq_restore(flags);
 968         put_user(status,value);
 969         return 0;
 970 }
 971
 972 /*
 973  * This routine sends a break character out the serial port.
 974  */
 975 static void send_break(struct m68k_serial * info, unsigned int duration)
 976 {
 977         m68328_uart *uart = &uart_addr[info->line];
 978         unsigned long flags;
 979         if (!info->port)
 980                 return;
 981         local_irq_save(flags);
 982 #ifdef USE_INTS
 983         uart->utx.w |= UTX_SEND_BREAK;
 984         msleep_interruptible(duration);
 985         uart->utx.w &= ~UTX_SEND_BREAK;
 986 #endif
 987         local_irq_restore(flags);
 988 }
 989
 990 static int rs_ioctl(struct tty_struct *tty, struct file * file,
 991                     unsigned int cmd, unsigned long arg)
 992 {
 993         int error;
 994         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
 995         int retval;
 996
 997         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
 998                 return -ENODEV;
 999
1000         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1001             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
1002             (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1003                 if (tty->flags & (1 << TTY_IO_ERROR))
1004                     return -EIO;
1005         }
1006
1007         switch (cmd) {
1008                 case TCSBRK:    /* SVID version: non-zero arg --> no break */
1009                         retval = tty_check_change(tty);
1010                         if (retval)
1011                                 return retval;
1012                         tty_wait_until_sent(tty, 0);
1013                         if (!arg)
1014                                 send_break(info, 250);  /* 1/4 second */
1015                         return 0;
1016                 case TCSBRKP:   /* support for POSIX tcsendbreak() */
1017                         retval = tty_check_change(tty);
1018                         if (retval)
1019                                 return retval;
1020                         tty_wait_until_sent(tty, 0);
1021                         send_break(info, arg ? arg*(100) : 250);
1022                         return 0;
1023                 case TIOCGSOFTCAR:
1024                         error = put_user(C_CLOCAL(tty) ? 1 : 0,
1025                                     (unsigned long *) arg);
1026                         if (error)
1027                                 return error;
1028                         return 0;
1029                 case TIOCSSOFTCAR:
1030                         get_user(arg, (unsigned long *) arg);
1031                         tty->termios->c_cflag =
1032                                 ((tty->termios->c_cflag & ~CLOCAL) |
1033                                  (arg ? CLOCAL : 0));
1034                         return 0;
1035                 case TIOCGSERIAL:
1036                         if (access_ok(VERIFY_WRITE, (void *) arg,
1037                                                 sizeof(struct serial_struct)))
1038                                 return get_serial_info(info,
1039                                                (struct serial_struct *) arg);
1040                         return -EFAULT;
1041                 case TIOCSSERIAL:
1042                         return set_serial_info(info,
1043                                                (struct serial_struct *) arg);
1044                 case TIOCSERGETLSR: /* Get line status register */
1045                         if (access_ok(VERIFY_WRITE, (void *) arg,
1046                                                 sizeof(unsigned int)))
1047                                 return get_lsr_info(info, (unsigned int *) arg);
1048                         return -EFAULT;
1049                 case TIOCSERGSTRUCT:
1050                         if (!access_ok(VERIFY_WRITE, (void *) arg,
1051                                                 sizeof(struct m68k_serial)))
1052                                 return -EFAULT;
1053                         copy_to_user((struct m68k_serial *) arg,
1054                                     info, sizeof(struct m68k_serial));
1055                         return 0;
1056
1057                 default:
1058                         return -ENOIOCTLCMD;
1059                 }
1060         return 0;
1061 }
1062
1063 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1064 {
1065         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1066
1067         if (tty->termios->c_cflag == old_termios->c_cflag)
1068                 return;
1069
1070         change_speed(info);
1071
1072         if ((old_termios->c_cflag & CRTSCTS) &&
1073             !(tty->termios->c_cflag & CRTSCTS)) {
1074                 tty->hw_stopped = 0;
1075                 rs_start(tty);
1076         }
1077
1078 }
1079
1080 /*
1081  * ------------------------------------------------------------
1082  * rs_close()
1083  *
1084  * This routine is called when the serial port gets closed.  First, we
1085  * wait for the last remaining data to be sent.  Then, we unlink its
1086  * S structure from the interrupt chain if necessary, and we free
1087  * that IRQ if nothing is left in the chain.
1088  * ------------------------------------------------------------
1089  */
1090 static void rs_close(struct tty_struct *tty, struct file * filp)
1091 {
1092         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1093         m68328_uart *uart = &uart_addr[info->line];
1094         unsigned long flags;
1095
1096         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1097                 return;
1098
1099         local_irq_save(flags);
1100
1101         if (tty_hung_up_p(filp)) {
1102                 local_irq_restore(flags);
1103                 return;
1104         }
1105
1106         if ((tty->count == 1) && (info->count != 1)) {
1107                 /*
1108                  * Uh, oh.  tty->count is 1, which means that the tty
1109                  * structure will be freed.  Info->count should always
1110                  * be one in these conditions.  If it's greater than
1111                  * one, we've got real problems, since it means the
1112                  * serial port won't be shutdown.
1113                  */
1114                 printk("rs_close: bad serial port count; tty->count is 1, "
1115                        "info->count is %d\n", info->count);
1116                 info->count = 1;
1117         }
1118         if (--info->count < 0) {
1119                 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1120                        info->line, info->count);
1121                 info->count = 0;
1122         }
1123         if (info->count) {
1124                 local_irq_restore(flags);
1125                 return;
1126         }
1127         info->flags |= S_CLOSING;
1128         /*
1129          * Now we wait for the transmit buffer to clear; and we notify
1130          * the line discipline to only process XON/XOFF characters.
1131          */
1132         tty->closing = 1;
1133         if (info->closing_wait != S_CLOSING_WAIT_NONE)
1134                 tty_wait_until_sent(tty, info->closing_wait);
1135         /*
1136          * At this point we stop accepting input.  To do this, we
1137          * disable the receive line status interrupts, and tell the
1138          * interrupt driver to stop checking the data ready bit in the
1139          * line status register.
1140          */
1141
1142         uart->ustcnt &= ~USTCNT_RXEN;
1143         uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1144
1145         shutdown(info);
1146         if (tty->driver->flush_buffer)
1147                 tty->driver->flush_buffer(tty);
1148
1149         tty_ldisc_flush(tty);
1150         tty->closing = 0;
1151         info->event = 0;
1152         info->tty = 0;
1153 #warning "This is not and has never been valid so fix it"
1154 #if 0
1155         if (tty->ldisc.num != ldiscs[N_TTY].num) {
1156                 if (tty->ldisc.close)
1157                         (tty->ldisc.close)(tty);
1158                 tty->ldisc = ldiscs[N_TTY];
1159                 tty->termios->c_line = N_TTY;
1160                 if (tty->ldisc.open)
1161                         (tty->ldisc.open)(tty);
1162         }
1163 #endif
1164         if (info->blocked_open) {
1165                 if (info->close_delay) {
1166                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1167                 }
1168                 wake_up_interruptible(&info->open_wait);
1169         }
1170         info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1171         wake_up_interruptible(&info->close_wait);
1172         local_irq_restore(flags);
1173 }
1174
1175 /*
1176  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1177  */
1178 void rs_hangup(struct tty_struct *tty)
1179 {
1180         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1181
1182         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1183                 return;
1184
1185         rs_flush_buffer(tty);
1186         shutdown(info);
1187         info->event = 0;
1188         info->count = 0;
1189         info->flags &= ~S_NORMAL_ACTIVE;
1190         info->tty = 0;
1191         wake_up_interruptible(&info->open_wait);
1192 }
1193
1194 /*
1195  * ------------------------------------------------------------
1196  * rs_open() and friends
1197  * ------------------------------------------------------------
1198  */
1199 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1200                            struct m68k_serial *info)
1201 {
1202         DECLARE_WAITQUEUE(wait, current);
1203         int             retval;
1204         int             do_clocal = 0;
1205
1206         /*
1207          * If the device is in the middle of being closed, then block
1208          * until it's done, and then try again.
1209          */
1210         if (info->flags & S_CLOSING) {
1211                 interruptible_sleep_on(&info->close_wait);
1212 #ifdef SERIAL_DO_RESTART
1213                 if (info->flags & S_HUP_NOTIFY)
1214                         return -EAGAIN;
1215                 else
1216                         return -ERESTARTSYS;
1217 #else
1218                 return -EAGAIN;
1219 #endif
1220         }
1221
1222         /*
1223          * If non-blocking mode is set, or the port is not enabled,
1224          * then make the check up front and then exit.
1225          */
1226         if ((filp->f_flags & O_NONBLOCK) ||
1227             (tty->flags & (1 << TTY_IO_ERROR))) {
1228                 info->flags |= S_NORMAL_ACTIVE;
1229                 return 0;
1230         }
1231
1232         if (tty->termios->c_cflag & CLOCAL)
1233                 do_clocal = 1;
1234
1235         /*
1236          * Block waiting for the carrier detect and the line to become
1237          * free (i.e., not in use by the callout).  While we are in
1238          * this loop, info->count is dropped by one, so that
1239          * rs_close() knows when to free things.  We restore it upon
1240          * exit, either normal or abnormal.
1241          */
1242         retval = 0;
1243         add_wait_queue(&info->open_wait, &wait);
1244
1245         info->count--;
1246         info->blocked_open++;
1247         while (1) {
1248                 local_irq_disable();
1249                 m68k_rtsdtr(info, 1);
1250                 local_irq_enable();
1251                 current->state = TASK_INTERRUPTIBLE;
1252                 if (tty_hung_up_p(filp) ||
1253                     !(info->flags & S_INITIALIZED)) {
1254 #ifdef SERIAL_DO_RESTART
1255                         if (info->flags & S_HUP_NOTIFY)
1256                                 retval = -EAGAIN;
1257                         else
1258                                 retval = -ERESTARTSYS;
1259 #else
1260                         retval = -EAGAIN;
1261 #endif
1262                         break;
1263                 }
1264                 if (!(info->flags & S_CLOSING) && do_clocal)
1265                         break;
1266                 if (signal_pending(current)) {
1267                         retval = -ERESTARTSYS;
1268                         break;
1269                 }
1270                 schedule();
1271         }
1272         current->state = TASK_RUNNING;
1273         remove_wait_queue(&info->open_wait, &wait);
1274         if (!tty_hung_up_p(filp))
1275                 info->count++;
1276         info->blocked_open--;
1277
1278         if (retval)
1279                 return retval;
1280         info->flags |= S_NORMAL_ACTIVE;
1281         return 0;
1282 }
1283
1284 /*
1285  * This routine is called whenever a serial port is opened.  It
1286  * enables interrupts for a serial port, linking in its S structure into
1287  * the IRQ chain.   It also performs the serial-specific
1288  * initialization for the tty structure.
1289  */
1290 int rs_open(struct tty_struct *tty, struct file * filp)
1291 {
1292         struct m68k_serial      *info;
1293         int                     retval, line;
1294
1295         line = tty->index;
1296
1297         if (line >= NR_PORTS || line < 0) /* we have exactly one */
1298                 return -ENODEV;
1299
1300         info = &m68k_soft[line];
1301
1302         if (serial_paranoia_check(info, tty->name, "rs_open"))
1303                 return -ENODEV;
1304
1305         info->count++;
1306         tty->driver_data = info;
1307         info->tty = tty;
1308
1309         /*
1310          * Start up serial port
1311          */
1312         retval = startup(info);
1313         if (retval)
1314                 return retval;
1315
1316         return block_til_ready(tty, filp, info);
1317 }
1318
1319 /* Finally, routines used to initialize the serial driver. */
1320
1321 static void show_serial_version(void)
1322 {
1323         printk("MC68328 serial driver version 1.00\n");
1324 }
1325
1326 static const struct tty_operations rs_ops = {
1327         .open = rs_open,
1328         .close = rs_close,
1329         .write = rs_write,
1330         .flush_chars = rs_flush_chars,
1331         .write_room = rs_write_room,
1332         .chars_in_buffer = rs_chars_in_buffer,
1333         .flush_buffer = rs_flush_buffer,
1334         .ioctl = rs_ioctl,
1335         .throttle = rs_throttle,
1336         .unthrottle = rs_unthrottle,
1337         .set_termios = rs_set_termios,
1338         .stop = rs_stop,
1339         .start = rs_start,
1340         .hangup = rs_hangup,
1341         .set_ldisc = rs_set_ldisc,
1342 };
1343
1344 /* rs_init inits the driver */
1345 static int __init
1346 rs68328_init(void)
1347 {
1348         int flags, i;
1349         struct m68k_serial *info;
1350
1351         serial_driver = alloc_tty_driver(NR_PORTS);
1352         if (!serial_driver)
1353                 return -ENOMEM;
1354
1355         show_serial_version();
1356
1357         /* Initialize the tty_driver structure */
1358         /* SPARC: Not all of this is exactly right for us. */
1359
1360         serial_driver->name = "ttyS";
1361         serial_driver->major = TTY_MAJOR;
1362         serial_driver->minor_start = 64;
1363         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1364         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1365         serial_driver->init_termios = tty_std_termios;
1366         serial_driver->init_termios.c_cflag =
1367                         m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1368         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1369         tty_set_operations(serial_driver, &rs_ops);
1370
1371         if (tty_register_driver(serial_driver)) {
1372                 put_tty_driver(serial_driver);
1373                 printk(KERN_ERR "Couldn't register serial driver\n");
1374                 return -ENOMEM;
1375         }
1376
1377         local_irq_save(flags);
1378
1379         for(i=0;i<NR_PORTS;i++) {
1380
1381             info = &m68k_soft[i];
1382             info->magic = SERIAL_MAGIC;
1383             info->port = (int) &uart_addr[i];
1384             info->tty = 0;
1385             info->irq = uart_irqs[i];
1386             info->custom_divisor = 16;
1387             info->close_delay = 50;
1388             info->closing_wait = 3000;
1389             info->x_char = 0;
1390             info->event = 0;
1391             info->count = 0;
1392             info->blocked_open = 0;
1393             INIT_WORK(&info->tqueue, do_softint);
1394             INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1395             init_waitqueue_head(&info->open_wait);
1396             init_waitqueue_head(&info->close_wait);
1397             info->line = i;
1398             info->is_cons = 1; /* Means shortcuts work */
1399
1400             printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1401                    info->port, info->irq);
1402             printk(" is a builtin MC68328 UART\n");
1403
1404             IRQ_ports[info->irq] = info;        /* waste of space */
1405
1406 #ifdef CONFIG_M68VZ328
1407                 if (i > 0 )
1408                         PJSEL &= 0xCF;  /* PSW enable second port output */
1409 #endif
1410
1411             if (request_irq(uart_irqs[i],
1412                             rs_interrupt,
1413                             IRQ_FLG_STD,
1414                             "M68328_UART", NULL))
1415                 panic("Unable to attach 68328 serial interrupt\n");
1416         }
1417         local_irq_restore(flags);
1418         return 0;
1419 }
1420
1421 module_init(rs68328_init);
1422
1423
1424
1425 static void m68328_set_baud(void)
1426 {
1427         unsigned short ustcnt;
1428         int     i;
1429
1430         ustcnt = USTCNT;
1431         USTCNT = ustcnt & ~USTCNT_TXEN;
1432
1433 again:
1434         for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++)
1435                 if (baud_table[i] == m68328_console_baud)
1436                         break;
1437         if (i >= sizeof(baud_table) / sizeof(baud_table[0])) {
1438                 m68328_console_baud = 9600;
1439                 goto again;
1440         }
1441
1442         UBAUD = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
1443                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1444         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1445         ustcnt |= USTCNT_8_7;
1446         ustcnt |= USTCNT_TXEN;
1447         USTCNT = ustcnt;
1448         m68328_console_initted = 1;
1449         return;
1450 }
1451
1452
1453 int m68328_console_setup(struct console *cp, char *arg)
1454 {
1455         int             i, n = CONSOLE_BAUD_RATE;
1456
1457         if (!cp)
1458                 return(-1);
1459
1460         if (arg)
1461                 n = simple_strtoul(arg,NULL,0);
1462
1463         for (i = 0; i < BAUD_TABLE_SIZE; i++)
1464                 if (baud_table[i] == n)
1465                         break;
1466         if (i < BAUD_TABLE_SIZE) {
1467                 m68328_console_baud = n;
1468                 m68328_console_cbaud = 0;
1469                 if (i > 15) {
1470                         m68328_console_cbaud |= CBAUDEX;
1471                         i -= 15;
1472                 }
1473                 m68328_console_cbaud |= i;
1474         }
1475
1476         m68328_set_baud(); /* make sure baud rate changes */
1477         return(0);
1478 }
1479
1480
1481 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1482 {
1483         *index = c->index;
1484         return serial_driver;
1485 }
1486
1487
1488 void m68328_console_write (struct console *co, const char *str,
1489                            unsigned int count)
1490 {
1491         if (!m68328_console_initted)
1492                 m68328_set_baud();
1493     while (count--) {
1494         if (*str == '\n')
1495            rs_put_char('\r');
1496         rs_put_char( *str++ );
1497     }
1498 }
1499
1500
1501 static struct console m68328_driver = {
1502         .name           = "ttyS",
1503         .write          = m68328_console_write,
1504         .device         = m68328_console_device,
1505         .setup          = m68328_console_setup,
1506         .flags          = CON_PRINTBUFFER,
1507         .index          = -1,
1508 };
1509
1510
1511 static int __init m68328_console_init(void)
1512 {
1513         register_console(&m68328_driver);
1514         return 0;
1515 }
1516
1517 console_initcall(m68328_console_init);