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/pm_legacy.h>
  37 #include <linux/bitops.h>
  38 #include <linux/delay.h>
  39
  40 #include <asm/io.h>
  41 #include <asm/irq.h>
  42 #include <asm/system.h>
  43 #include <asm/delay.h>
  44 #include <asm/uaccess.h>
  45
  46 /* (es) */
  47 /* note: perhaps we can murge these files, so that you can just
  48  *       define 1 of them, and they can sort that out for themselves
  49  */
  50 #if defined(CONFIG_M68EZ328)
  51 #include <asm/MC68EZ328.h>
  52 #else
  53 #if defined(CONFIG_M68VZ328)
  54 #include <asm/MC68VZ328.h>
  55 #else
  56 #include <asm/MC68328.h>
  57 #endif /* CONFIG_M68VZ328 */
  58 #endif /* CONFIG_M68EZ328 */
  59
  60 #include "68328serial.h"
  61
  62 /* Turn off usage of real serial interrupt code, to "support" Copilot */
  63 #ifdef CONFIG_XCOPILOT_BUGS
  64 #undef USE_INTS
  65 #else
  66 #define USE_INTS
  67 #endif
  68
  69 static struct m68k_serial m68k_soft[NR_PORTS];
  70 struct m68k_serial *IRQ_ports[NR_IRQS];
  71
  72 static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
  73
  74 /* multiple ports are contiguous in memory */
  75 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
  76
  77 struct tty_struct m68k_ttys;
  78 struct m68k_serial *m68k_consinfo = 0;
  79
  80 #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
  81
  82 #ifdef CONFIG_CONSOLE
  83 extern wait_queue_head_t keypress_wait;
  84 #endif
  85
  86 struct tty_driver *serial_driver;
  87
  88 /* serial subtype definitions */
  89 #define SERIAL_TYPE_NORMAL      1
  90
  91 /* number of characters left in xmit buffer before we ask for more */
  92 #define WAKEUP_CHARS 256
  93
  94 /* Debugging... DEBUG_INTR is bad to use when one of the zs
  95  * lines is your console ;(
  96  */
  97 #undef SERIAL_DEBUG_INTR
  98 #undef SERIAL_DEBUG_OPEN
  99 #undef SERIAL_DEBUG_FLOW
 100
 101 #define RS_ISR_PASS_LIMIT 256
 102
 103 static void change_speed(struct m68k_serial *info);
 104
 105 /*
 106  *      Setup for console. Argument comes from the boot command line.
 107  */
 108
 109 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
 110 #define CONSOLE_BAUD_RATE       115200
 111 #define DEFAULT_CBAUD           B115200
 112 #else
 113         /* (es) */
 114         /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
 115         #ifdef CONFIG_M68VZ328
 116         #define CONSOLE_BAUD_RATE       19200
 117         #define DEFAULT_CBAUD           B19200
 118         #endif
 119         /* (/es) */
 120 #endif
 121
 122 #ifndef CONSOLE_BAUD_RATE
 123 #define CONSOLE_BAUD_RATE       9600
 124 #define DEFAULT_CBAUD           B9600
 125 #endif
 126
 127
 128 static int m68328_console_initted = 0;
 129 static int m68328_console_baud    = CONSOLE_BAUD_RATE;
 130 static int m68328_console_cbaud   = DEFAULT_CBAUD;
 131
 132
 133 static inline int serial_paranoia_check(struct m68k_serial *info,
 134                                         char *name, const char *routine)
 135 {
 136 #ifdef SERIAL_PARANOIA_CHECK
 137         static const char *badmagic =
 138                 "Warning: bad magic number for serial struct %s in %s\n";
 139         static const char *badinfo =
 140                 "Warning: null m68k_serial for %s in %s\n";
 141
 142         if (!info) {
 143                 printk(badinfo, name, routine);
 144                 return 1;
 145         }
 146         if (info->magic != SERIAL_MAGIC) {
 147                 printk(badmagic, name, routine);
 148                 return 1;
 149         }
 150 #endif
 151         return 0;
 152 }
 153
 154 /*
 155  * This is used to figure out the divisor speeds and the timeouts
 156  */
 157 static int baud_table[] = {
 158         0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
 159         9600, 19200, 38400, 57600, 115200, 0 };
 160
 161 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
 162
 163 /* Sets or clears DTR/RTS on the requested line */
 164 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
 165 {
 166         if (set) {
 167                 /* set the RTS/CTS line */
 168         } else {
 169                 /* clear it */
 170         }
 171         return;
 172 }
 173
 174 /* Utility routines */
 175 static inline int get_baud(struct m68k_serial *ss)
 176 {
 177         unsigned long result = 115200;
 178         unsigned short int baud = uart_addr[ss->line].ubaud;
 179         if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
 180         result >>= GET_FIELD(baud, UBAUD_DIVIDE);
 181
 182         return result;
 183 }
 184
 185 /*
 186  * ------------------------------------------------------------
 187  * rs_stop() and rs_start()
 188  *
 189  * This routines are called before setting or resetting tty->stopped.
 190  * They enable or disable transmitter interrupts, as necessary.
 191  * ------------------------------------------------------------
 192  */
 193 static void rs_stop(struct tty_struct *tty)
 194 {
 195         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 196         m68328_uart *uart = &uart_addr[info->line];
 197         unsigned long flags;
 198
 199         if (serial_paranoia_check(info, tty->name, "rs_stop"))
 200                 return;
 201
 202         local_irq_save(flags);
 203         uart->ustcnt &= ~USTCNT_TXEN;
 204         local_irq_restore(flags);
 205 }
 206
 207 static void rs_put_char(char ch)
 208 {
 209         int flags, loops = 0;
 210
 211         local_irq_save(flags);
 212
 213         while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
 214                 loops++;
 215                 udelay(5);
 216         }
 217
 218         UTX_TXDATA = ch;
 219         udelay(5);
 220         local_irq_restore(flags);
 221 }
 222
 223 static void rs_start(struct tty_struct *tty)
 224 {
 225         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 226         m68328_uart *uart = &uart_addr[info->line];
 227         unsigned long flags;
 228
 229         if (serial_paranoia_check(info, tty->name, "rs_start"))
 230                 return;
 231
 232         local_irq_save(flags);
 233         if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
 234 #ifdef USE_INTS
 235                 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 236 #else
 237                 uart->ustcnt |= USTCNT_TXEN;
 238 #endif
 239         }
 240         local_irq_restore(flags);
 241 }
 242
 243 /* Drop into either the boot monitor or kadb upon receiving a break
 244  * from keyboard/console input.
 245  */
 246 static void batten_down_hatches(void)
 247 {
 248         /* Drop into the debugger */
 249 }
 250
 251 static void status_handle(struct m68k_serial *info, unsigned short status)
 252 {
 253 #if 0
 254         if(status & DCD) {
 255                 if((info->tty->termios->c_cflag & CRTSCTS) &&
 256                    ((info->curregs[3] & AUTO_ENAB)==0)) {
 257                         info->curregs[3] |= AUTO_ENAB;
 258                         info->pendregs[3] |= AUTO_ENAB;
 259                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 260                 }
 261         } else {
 262                 if((info->curregs[3] & AUTO_ENAB)) {
 263                         info->curregs[3] &= ~AUTO_ENAB;
 264                         info->pendregs[3] &= ~AUTO_ENAB;
 265                         write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 266                 }
 267         }
 268 #endif
 269         /* If this is console input and this is a
 270          * 'break asserted' status change interrupt
 271          * see if we can drop into the debugger
 272          */
 273         if((status & URX_BREAK) && info->break_abort)
 274                 batten_down_hatches();
 275         return;
 276 }
 277
 278 static void receive_chars(struct m68k_serial *info, struct pt_regs *regs,
 279                           unsigned short rx)
 280 {
 281         struct tty_struct *tty = info->tty;
 282         m68328_uart *uart = &uart_addr[info->line];
 283         unsigned char ch, flag;
 284
 285         /*
 286          * This do { } while() loop will get ALL chars out of Rx FIFO
 287          */
 288 #ifndef CONFIG_XCOPILOT_BUGS
 289         do {
 290 #endif
 291                 ch = GET_FIELD(rx, URX_RXDATA);
 292
 293                 if(info->is_cons) {
 294                         if(URX_BREAK & rx) { /* whee, break received */
 295                                 status_handle(info, rx);
 296                                 return;
 297 #ifdef CONFIG_MAGIC_SYSRQ
 298                         } else if (ch == 0x10) { /* ^P */
 299                                 show_state();
 300                                 show_free_areas();
 301                                 show_buffers();
 302 /*                              show_net_buffers(); */
 303                                 return;
 304                         } else if (ch == 0x12) { /* ^R */
 305                                 emergency_restart();
 306                                 return;
 307 #endif /* CONFIG_MAGIC_SYSRQ */
 308                         }
 309                         /* It is a 'keyboard interrupt' ;-) */
 310 #ifdef CONFIG_CONSOLE
 311                         wake_up(&keypress_wait);
 312 #endif
 313                 }
 314
 315                 if(!tty)
 316                         goto clear_and_exit;
 317
 318                 flag = TTY_NORMAL;
 319
 320                 if(rx & URX_PARITY_ERROR) {
 321                         flag = TTY_PARITY;
 322                         status_handle(info, rx);
 323                 } else if(rx & URX_OVRUN) {
 324                         flag = TTY_OVERRUN;
 325                         status_handle(info, rx);
 326                 } else if(rx & URX_FRAME_ERROR) {
 327                         flag = TTY_FRAME;
 328                         status_handle(info, rx);
 329                 }
 330                 tty_insert_flip_char(tty, ch, flag);
 331 #ifndef CONFIG_XCOPILOT_BUGS
 332         } while((rx = uart->urx.w) & URX_DATA_READY);
 333 #endif
 334
 335         tty_schedule_flip(tty);
 336
 337 clear_and_exit:
 338         return;
 339 }
 340
 341 static void transmit_chars(struct m68k_serial *info)
 342 {
 343         m68328_uart *uart = &uart_addr[info->line];
 344
 345         if (info->x_char) {
 346                 /* Send next char */
 347                 uart->utx.b.txdata = info->x_char;
 348                 info->x_char = 0;
 349                 goto clear_and_return;
 350         }
 351
 352         if((info->xmit_cnt <= 0) || info->tty->stopped) {
 353                 /* That's peculiar... TX ints off */
 354                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 355                 goto clear_and_return;
 356         }
 357
 358         /* Send char */
 359         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 360         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 361         info->xmit_cnt--;
 362
 363         if (info->xmit_cnt < WAKEUP_CHARS)
 364                 schedule_work(&info->tqueue);
 365
 366         if(info->xmit_cnt <= 0) {
 367                 /* All done for now... TX ints off */
 368                 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 369                 goto clear_and_return;
 370         }
 371
 372 clear_and_return:
 373         /* Clear interrupt (should be auto)*/
 374         return;
 375 }
 376
 377 /*
 378  * This is the serial driver's generic interrupt routine
 379  */
 380 irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
 381 {
 382         struct m68k_serial * info;
 383         m68328_uart *uart;
 384         unsigned short rx;
 385         unsigned short tx;
 386
 387         info = IRQ_ports[irq];
 388         if(!info)
 389             return IRQ_NONE;
 390
 391         uart = &uart_addr[info->line];
 392         rx = uart->urx.w;
 393
 394 #ifdef USE_INTS
 395         tx = uart->utx.w;
 396
 397         if (rx & URX_DATA_READY) receive_chars(info, regs, rx);
 398         if (tx & UTX_TX_AVAIL)   transmit_chars(info);
 399 #else
 400         receive_chars(info, regs, rx);
 401 #endif
 402         return IRQ_HANDLED;
 403 }
 404
 405 static void do_softint(void *private)
 406 {
 407         struct m68k_serial      *info = (struct m68k_serial *) private;
 408         struct tty_struct       *tty;
 409
 410         tty = info->tty;
 411         if (!tty)
 412                 return;
 413 #if 0
 414         if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
 415                 tty_wakeup(tty);
 416         }
 417 #endif
 418 }
 419
 420 /*
 421  * This routine is called from the scheduler tqueue when the interrupt
 422  * routine has signalled that a hangup has occurred.  The path of
 423  * hangup processing is:
 424  *
 425  *      serial interrupt routine -> (scheduler tqueue) ->
 426  *      do_serial_hangup() -> tty->hangup() -> rs_hangup()
 427  *
 428  */
 429 static void do_serial_hangup(void *private)
 430 {
 431         struct m68k_serial      *info = (struct m68k_serial *) private;
 432         struct tty_struct       *tty;
 433
 434         tty = info->tty;
 435         if (!tty)
 436                 return;
 437
 438         tty_hangup(tty);
 439 }
 440
 441
 442 static int startup(struct m68k_serial * info)
 443 {
 444         m68328_uart *uart = &uart_addr[info->line];
 445         unsigned long flags;
 446
 447         if (info->flags & S_INITIALIZED)
 448                 return 0;
 449
 450         if (!info->xmit_buf) {
 451                 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
 452                 if (!info->xmit_buf)
 453                         return -ENOMEM;
 454         }
 455
 456         local_irq_save(flags);
 457
 458         /*
 459          * Clear the FIFO buffers and disable them
 460          * (they will be reenabled in change_speed())
 461          */
 462
 463         uart->ustcnt = USTCNT_UEN;
 464         info->xmit_fifo_size = 1;
 465         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
 466         (void)uart->urx.w;
 467
 468         /*
 469          * Finally, enable sequencing and interrupts
 470          */
 471 #ifdef USE_INTS
 472         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
 473                  USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
 474 #else
 475         uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
 476 #endif
 477
 478         if (info->tty)
 479                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
 480         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 481
 482         /*
 483          * and set the speed of the serial port
 484          */
 485
 486         change_speed(info);
 487
 488         info->flags |= S_INITIALIZED;
 489         local_irq_restore(flags);
 490         return 0;
 491 }
 492
 493 /*
 494  * This routine will shutdown a serial port; interrupts are disabled, and
 495  * DTR is dropped if the hangup on close termio flag is on.
 496  */
 497 static void shutdown(struct m68k_serial * info)
 498 {
 499         m68328_uart *uart = &uart_addr[info->line];
 500         unsigned long   flags;
 501
 502         uart->ustcnt = 0; /* All off! */
 503         if (!(info->flags & S_INITIALIZED))
 504                 return;
 505
 506         local_irq_save(flags);
 507
 508         if (info->xmit_buf) {
 509                 free_page((unsigned long) info->xmit_buf);
 510                 info->xmit_buf = 0;
 511         }
 512
 513         if (info->tty)
 514                 set_bit(TTY_IO_ERROR, &info->tty->flags);
 515
 516         info->flags &= ~S_INITIALIZED;
 517         local_irq_restore(flags);
 518 }
 519
 520 struct {
 521         int divisor, prescale;
 522 }
 523 #ifndef CONFIG_M68VZ328
 524  hw_baud_table[18] = {
 525         {0,0}, /* 0 */
 526         {0,0}, /* 50 */
 527         {0,0}, /* 75 */
 528         {0,0}, /* 110 */
 529         {0,0}, /* 134 */
 530         {0,0}, /* 150 */
 531         {0,0}, /* 200 */
 532         {7,0x26}, /* 300 */
 533         {6,0x26}, /* 600 */
 534         {5,0x26}, /* 1200 */
 535         {0,0}, /* 1800 */
 536         {4,0x26}, /* 2400 */
 537         {3,0x26}, /* 4800 */
 538         {2,0x26}, /* 9600 */
 539         {1,0x26}, /* 19200 */
 540         {0,0x26}, /* 38400 */
 541         {1,0x38}, /* 57600 */
 542         {0,0x38}, /* 115200 */
 543 };
 544 #else
 545  hw_baud_table[18] = {
 546                  {0,0}, /* 0 */
 547                  {0,0}, /* 50 */
 548                  {0,0}, /* 75 */
 549                  {0,0}, /* 110 */
 550                  {0,0}, /* 134 */
 551                  {0,0}, /* 150 */
 552                  {0,0}, /* 200 */
 553                  {0,0}, /* 300 */
 554                  {7,0x26}, /* 600 */
 555                  {6,0x26}, /* 1200 */
 556                  {0,0}, /* 1800 */
 557                  {5,0x26}, /* 2400 */
 558                  {4,0x26}, /* 4800 */
 559                  {3,0x26}, /* 9600 */
 560                  {2,0x26}, /* 19200 */
 561                  {1,0x26}, /* 38400 */
 562                  {0,0x26}, /* 57600 */
 563                  {1,0x38}, /* 115200 */
 564 };
 565 #endif
 566 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
 567
 568 /*
 569  * This routine is called to set the UART divisor registers to match
 570  * the specified baud rate for a serial port.
 571  */
 572 static void change_speed(struct m68k_serial *info)
 573 {
 574         m68328_uart *uart = &uart_addr[info->line];
 575         unsigned short port;
 576         unsigned short ustcnt;
 577         unsigned cflag;
 578         int     i;
 579
 580         if (!info->tty || !info->tty->termios)
 581                 return;
 582         cflag = info->tty->termios->c_cflag;
 583         if (!(port = info->port))
 584                 return;
 585
 586         ustcnt = uart->ustcnt;
 587         uart->ustcnt = ustcnt & ~USTCNT_TXEN;
 588
 589         i = cflag & CBAUD;
 590         if (i & CBAUDEX) {
 591                 i = (i & ~CBAUDEX) + B38400;
 592         }
 593
 594         info->baud = baud_table[i];
 595         uart->ubaud = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
 596                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
 597
 598         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
 599
 600         if ((cflag & CSIZE) == CS8)
 601                 ustcnt |= USTCNT_8_7;
 602
 603         if (cflag & CSTOPB)
 604                 ustcnt |= USTCNT_STOP;
 605
 606         if (cflag & PARENB)
 607                 ustcnt |= USTCNT_PARITYEN;
 608         if (cflag & PARODD)
 609                 ustcnt |= USTCNT_ODD_EVEN;
 610
 611 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 612         if (cflag & CRTSCTS) {
 613                 uart->utx.w &= ~ UTX_NOCTS;
 614         } else {
 615                 uart->utx.w |= UTX_NOCTS;
 616         }
 617 #endif
 618
 619         ustcnt |= USTCNT_TXEN;
 620
 621         uart->ustcnt = ustcnt;
 622         return;
 623 }
 624
 625 /*
 626  * Fair output driver allows a process to speak.
 627  */
 628 static void rs_fair_output(void)
 629 {
 630         int left;               /* Output no more than that */
 631         unsigned long flags;
 632         struct m68k_serial *info = &m68k_soft[0];
 633         char c;
 634
 635         if (info == 0) return;
 636         if (info->xmit_buf == 0) return;
 637
 638         local_irq_save(flags);
 639         left = info->xmit_cnt;
 640         while (left != 0) {
 641                 c = info->xmit_buf[info->xmit_tail];
 642                 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
 643                 info->xmit_cnt--;
 644                 local_irq_restore(flags);
 645
 646                 rs_put_char(c);
 647
 648                 local_irq_save(flags);
 649                 left = min(info->xmit_cnt, left-1);
 650         }
 651
 652         /* Last character is being transmitted now (hopefully). */
 653         udelay(5);
 654
 655         local_irq_restore(flags);
 656         return;
 657 }
 658
 659 /*
 660  * m68k_console_print is registered for printk.
 661  */
 662 void console_print_68328(const char *p)
 663 {
 664         char c;
 665
 666         while((c=*(p++)) != 0) {
 667                 if(c == '\n')
 668                         rs_put_char('\r');
 669                 rs_put_char(c);
 670         }
 671
 672         /* Comment this if you want to have a strict interrupt-driven output */
 673         rs_fair_output();
 674
 675         return;
 676 }
 677
 678 static void rs_set_ldisc(struct tty_struct *tty)
 679 {
 680         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 681
 682         if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
 683                 return;
 684
 685         info->is_cons = (tty->termios->c_line == N_TTY);
 686
 687         printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
 688 }
 689
 690 static void rs_flush_chars(struct tty_struct *tty)
 691 {
 692         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 693         m68328_uart *uart = &uart_addr[info->line];
 694         unsigned long flags;
 695
 696         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 697                 return;
 698 #ifndef USE_INTS
 699         for(;;) {
 700 #endif
 701
 702         /* Enable transmitter */
 703         local_irq_save(flags);
 704
 705         if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
 706                         !info->xmit_buf) {
 707                 local_irq_restore(flags);
 708                 return;
 709         }
 710
 711 #ifdef USE_INTS
 712         uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 713 #else
 714         uart->ustcnt |= USTCNT_TXEN;
 715 #endif
 716
 717 #ifdef USE_INTS
 718         if (uart->utx.w & UTX_TX_AVAIL) {
 719 #else
 720         if (1) {
 721 #endif
 722                 /* Send char */
 723                 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 724                 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 725                 info->xmit_cnt--;
 726         }
 727
 728 #ifndef USE_INTS
 729         while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 730         }
 731 #endif
 732         local_irq_restore(flags);
 733 }
 734
 735 extern void console_printn(const char * b, int count);
 736
 737 static int rs_write(struct tty_struct * tty,
 738                     const unsigned char *buf, int count)
 739 {
 740         int     c, total = 0;
 741         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 742         m68328_uart *uart = &uart_addr[info->line];
 743         unsigned long flags;
 744
 745         if (serial_paranoia_check(info, tty->name, "rs_write"))
 746                 return 0;
 747
 748         if (!tty || !info->xmit_buf)
 749                 return 0;
 750
 751         local_save_flags(flags);
 752         while (1) {
 753                 local_irq_disable();
 754                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
 755                                    SERIAL_XMIT_SIZE - info->xmit_head));
 756                 local_irq_restore(flags);
 757
 758                 if (c <= 0)
 759                         break;
 760
 761                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
 762
 763                 local_irq_disable();
 764                 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
 765                 info->xmit_cnt += c;
 766                 local_irq_restore(flags);
 767                 buf += c;
 768                 count -= c;
 769                 total += c;
 770         }
 771
 772         if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
 773                 /* Enable transmitter */
 774                 local_irq_disable();
 775 #ifndef USE_INTS
 776                 while(info->xmit_cnt) {
 777 #endif
 778
 779                 uart->ustcnt |= USTCNT_TXEN;
 780 #ifdef USE_INTS
 781                 uart->ustcnt |= USTCNT_TX_INTR_MASK;
 782 #else
 783                 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 784 #endif
 785                 if (uart->utx.w & UTX_TX_AVAIL) {
 786                         uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 787                         info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 788                         info->xmit_cnt--;
 789                 }
 790
 791 #ifndef USE_INTS
 792                 }
 793 #endif
 794                 local_irq_restore(flags);
 795         }
 796
 797         return total;
 798 }
 799
 800 static int rs_write_room(struct tty_struct *tty)
 801 {
 802         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 803         int     ret;
 804
 805         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 806                 return 0;
 807         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
 808         if (ret < 0)
 809                 ret = 0;
 810         return ret;
 811 }
 812
 813 static int rs_chars_in_buffer(struct tty_struct *tty)
 814 {
 815         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 816
 817         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 818                 return 0;
 819         return info->xmit_cnt;
 820 }
 821
 822 static void rs_flush_buffer(struct tty_struct *tty)
 823 {
 824         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 825         unsigned long flags;
 826
 827         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 828                 return;
 829         local_irq_save(flags);
 830         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 831         local_irq_restore(flags);
 832         tty_wakeup(tty);
 833 }
 834
 835 /*
 836  * ------------------------------------------------------------
 837  * rs_throttle()
 838  *
 839  * This routine is called by the upper-layer tty layer to signal that
 840  * incoming characters should be throttled.
 841  * ------------------------------------------------------------
 842  */
 843 static void rs_throttle(struct tty_struct * tty)
 844 {
 845         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 846
 847         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 848                 return;
 849
 850         if (I_IXOFF(tty))
 851                 info->x_char = STOP_CHAR(tty);
 852
 853         /* Turn off RTS line (do this atomic) */
 854 }
 855
 856 static void rs_unthrottle(struct tty_struct * tty)
 857 {
 858         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 859
 860         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
 861                 return;
 862
 863         if (I_IXOFF(tty)) {
 864                 if (info->x_char)
 865                         info->x_char = 0;
 866                 else
 867                         info->x_char = START_CHAR(tty);
 868         }
 869
 870         /* Assert RTS line (do this atomic) */
 871 }
 872
 873 /*
 874  * ------------------------------------------------------------
 875  * rs_ioctl() and friends
 876  * ------------------------------------------------------------
 877  */
 878
 879 static int get_serial_info(struct m68k_serial * info,
 880                            struct serial_struct * retinfo)
 881 {
 882         struct serial_struct tmp;
 883
 884         if (!retinfo)
 885                 return -EFAULT;
 886         memset(&tmp, 0, sizeof(tmp));
 887         tmp.type = info->type;
 888         tmp.line = info->line;
 889         tmp.port = info->port;
 890         tmp.irq = info->irq;
 891         tmp.flags = info->flags;
 892         tmp.baud_base = info->baud_base;
 893         tmp.close_delay = info->close_delay;
 894         tmp.closing_wait = info->closing_wait;
 895         tmp.custom_divisor = info->custom_divisor;
 896         copy_to_user(retinfo,&tmp,sizeof(*retinfo));
 897         return 0;
 898 }
 899
 900 static int set_serial_info(struct m68k_serial * info,
 901                            struct serial_struct * new_info)
 902 {
 903         struct serial_struct new_serial;
 904         struct m68k_serial old_info;
 905         int                     retval = 0;
 906
 907         if (!new_info)
 908                 return -EFAULT;
 909         copy_from_user(&new_serial,new_info,sizeof(new_serial));
 910         old_info = *info;
 911
 912         if (!capable(CAP_SYS_ADMIN)) {
 913                 if ((new_serial.baud_base != info->baud_base) ||
 914                     (new_serial.type != info->type) ||
 915                     (new_serial.close_delay != info->close_delay) ||
 916                     ((new_serial.flags & ~S_USR_MASK) !=
 917                      (info->flags & ~S_USR_MASK)))
 918                         return -EPERM;
 919                 info->flags = ((info->flags & ~S_USR_MASK) |
 920                                (new_serial.flags & S_USR_MASK));
 921                 info->custom_divisor = new_serial.custom_divisor;
 922                 goto check_and_exit;
 923         }
 924
 925         if (info->count > 1)
 926                 return -EBUSY;
 927
 928         /*
 929          * OK, past this point, all the error checking has been done.
 930          * At this point, we start making changes.....
 931          */
 932
 933         info->baud_base = new_serial.baud_base;
 934         info->flags = ((info->flags & ~S_FLAGS) |
 935                         (new_serial.flags & S_FLAGS));
 936         info->type = new_serial.type;
 937         info->close_delay = new_serial.close_delay;
 938         info->closing_wait = new_serial.closing_wait;
 939
 940 check_and_exit:
 941         retval = startup(info);
 942         return retval;
 943 }
 944
 945 /*
 946  * get_lsr_info - get line status register info
 947  *
 948  * Purpose: Let user call ioctl() to get info when the UART physically
 949  *          is emptied.  On bus types like RS485, the transmitter must
 950  *          release the bus after transmitting. This must be done when
 951  *          the transmit shift register is empty, not be done when the
 952  *          transmit holding register is empty.  This functionality
 953  *          allows an RS485 driver to be written in user space.
 954  */
 955 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
 956 {
 957 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 958         m68328_uart *uart = &uart_addr[info->line];
 959 #endif
 960         unsigned char status;
 961         unsigned long flags;
 962
 963         local_irq_save(flags);
 964 #ifdef CONFIG_SERIAL_68328_RTS_CTS
 965         status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
 966 #else
 967         status = 0;
 968 #endif
 969         local_irq_restore(flags);
 970         put_user(status,value);
 971         return 0;
 972 }
 973
 974 /*
 975  * This routine sends a break character out the serial port.
 976  */
 977 static void send_break(struct m68k_serial * info, unsigned int duration)
 978 {
 979         m68328_uart *uart = &uart_addr[info->line];
 980         unsigned long flags;
 981         if (!info->port)
 982                 return;
 983         local_irq_save(flags);
 984 #ifdef USE_INTS
 985         uart->utx.w |= UTX_SEND_BREAK;
 986         msleep_interruptible(duration);
 987         uart->utx.w &= ~UTX_SEND_BREAK;
 988 #endif
 989         local_irq_restore(flags);
 990 }
 991
 992 static int rs_ioctl(struct tty_struct *tty, struct file * file,
 993                     unsigned int cmd, unsigned long arg)
 994 {
 995         int error;
 996         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
 997         int retval;
 998
 999         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1000                 return -ENODEV;
1001
1002         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1003             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
1004             (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1005                 if (tty->flags & (1 << TTY_IO_ERROR))
1006                     return -EIO;
1007         }
1008
1009         switch (cmd) {
1010                 case TCSBRK:    /* SVID version: non-zero arg --> no break */
1011                         retval = tty_check_change(tty);
1012                         if (retval)
1013                                 return retval;
1014                         tty_wait_until_sent(tty, 0);
1015                         if (!arg)
1016                                 send_break(info, 250);  /* 1/4 second */
1017                         return 0;
1018                 case TCSBRKP:   /* support for POSIX tcsendbreak() */
1019                         retval = tty_check_change(tty);
1020                         if (retval)
1021                                 return retval;
1022                         tty_wait_until_sent(tty, 0);
1023                         send_break(info, arg ? arg*(100) : 250);
1024                         return 0;
1025                 case TIOCGSOFTCAR:
1026                         error = put_user(C_CLOCAL(tty) ? 1 : 0,
1027                                     (unsigned long *) arg);
1028                         if (error)
1029                                 return error;
1030                         return 0;
1031                 case TIOCSSOFTCAR:
1032                         get_user(arg, (unsigned long *) arg);
1033                         tty->termios->c_cflag =
1034                                 ((tty->termios->c_cflag & ~CLOCAL) |
1035                                  (arg ? CLOCAL : 0));
1036                         return 0;
1037                 case TIOCGSERIAL:
1038                         if (access_ok(VERIFY_WRITE, (void *) arg,
1039                                                 sizeof(struct serial_struct)))
1040                                 return get_serial_info(info,
1041                                                (struct serial_struct *) arg);
1042                         return -EFAULT;
1043                 case TIOCSSERIAL:
1044                         return set_serial_info(info,
1045                                                (struct serial_struct *) arg);
1046                 case TIOCSERGETLSR: /* Get line status register */
1047                         if (access_ok(VERIFY_WRITE, (void *) arg,
1048                                                 sizeof(unsigned int)))
1049                                 return get_lsr_info(info, (unsigned int *) arg);
1050                         return -EFAULT;
1051                 case TIOCSERGSTRUCT:
1052                         if (!access_ok(VERIFY_WRITE, (void *) arg,
1053                                                 sizeof(struct m68k_serial)))
1054                                 return -EFAULT;
1055                         copy_to_user((struct m68k_serial *) arg,
1056                                     info, sizeof(struct m68k_serial));
1057                         return 0;
1058
1059                 default:
1060                         return -ENOIOCTLCMD;
1061                 }
1062         return 0;
1063 }
1064
1065 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1066 {
1067         struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1068
1069         if (tty->termios->c_cflag == old_termios->c_cflag)
1070                 return;
1071
1072         change_speed(info);
1073
1074         if ((old_termios->c_cflag & CRTSCTS) &&
1075             !(tty->termios->c_cflag & CRTSCTS)) {
1076                 tty->hw_stopped = 0;
1077                 rs_start(tty);
1078         }
1079
1080 }
1081
1082 /*
1083  * ------------------------------------------------------------
1084  * rs_close()
1085  *
1086  * This routine is called when the serial port gets closed.  First, we
1087  * wait for the last remaining data to be sent.  Then, we unlink its
1088  * S structure from the interrupt chain if necessary, and we free
1089  * that IRQ if nothing is left in the chain.
1090  * ------------------------------------------------------------
1091  */
1092 static void rs_close(struct tty_struct *tty, struct file * filp)
1093 {
1094         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1095         m68328_uart *uart = &uart_addr[info->line];
1096         unsigned long flags;
1097
1098         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1099                 return;
1100
1101         local_irq_save(flags);
1102
1103         if (tty_hung_up_p(filp)) {
1104                 local_irq_restore(flags);
1105                 return;
1106         }
1107
1108         if ((tty->count == 1) && (info->count != 1)) {
1109                 /*
1110                  * Uh, oh.  tty->count is 1, which means that the tty
1111                  * structure will be freed.  Info->count should always
1112                  * be one in these conditions.  If it's greater than
1113                  * one, we've got real problems, since it means the
1114                  * serial port won't be shutdown.
1115                  */
1116                 printk("rs_close: bad serial port count; tty->count is 1, "
1117                        "info->count is %d\n", info->count);
1118                 info->count = 1;
1119         }
1120         if (--info->count < 0) {
1121                 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1122                        info->line, info->count);
1123                 info->count = 0;
1124         }
1125         if (info->count) {
1126                 local_irq_restore(flags);
1127                 return;
1128         }
1129         info->flags |= S_CLOSING;
1130         /*
1131          * Now we wait for the transmit buffer to clear; and we notify
1132          * the line discipline to only process XON/XOFF characters.
1133          */
1134         tty->closing = 1;
1135         if (info->closing_wait != S_CLOSING_WAIT_NONE)
1136                 tty_wait_until_sent(tty, info->closing_wait);
1137         /*
1138          * At this point we stop accepting input.  To do this, we
1139          * disable the receive line status interrupts, and tell the
1140          * interrupt driver to stop checking the data ready bit in the
1141          * line status register.
1142          */
1143
1144         uart->ustcnt &= ~USTCNT_RXEN;
1145         uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1146
1147         shutdown(info);
1148         if (tty->driver->flush_buffer)
1149                 tty->driver->flush_buffer(tty);
1150
1151         tty_ldisc_flush(tty);
1152         tty->closing = 0;
1153         info->event = 0;
1154         info->tty = 0;
1155 #warning "This is not and has never been valid so fix it"
1156 #if 0
1157         if (tty->ldisc.num != ldiscs[N_TTY].num) {
1158                 if (tty->ldisc.close)
1159                         (tty->ldisc.close)(tty);
1160                 tty->ldisc = ldiscs[N_TTY];
1161                 tty->termios->c_line = N_TTY;
1162                 if (tty->ldisc.open)
1163                         (tty->ldisc.open)(tty);
1164         }
1165 #endif
1166         if (info->blocked_open) {
1167                 if (info->close_delay) {
1168                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1169                 }
1170                 wake_up_interruptible(&info->open_wait);
1171         }
1172         info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1173         wake_up_interruptible(&info->close_wait);
1174         local_irq_restore(flags);
1175 }
1176
1177 /*
1178  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1179  */
1180 void rs_hangup(struct tty_struct *tty)
1181 {
1182         struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1183
1184         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1185                 return;
1186
1187         rs_flush_buffer(tty);
1188         shutdown(info);
1189         info->event = 0;
1190         info->count = 0;
1191         info->flags &= ~S_NORMAL_ACTIVE;
1192         info->tty = 0;
1193         wake_up_interruptible(&info->open_wait);
1194 }
1195
1196 /*
1197  * ------------------------------------------------------------
1198  * rs_open() and friends
1199  * ------------------------------------------------------------
1200  */
1201 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1202                            struct m68k_serial *info)
1203 {
1204         DECLARE_WAITQUEUE(wait, current);
1205         int             retval;
1206         int             do_clocal = 0;
1207
1208         /*
1209          * If the device is in the middle of being closed, then block
1210          * until it's done, and then try again.
1211          */
1212         if (info->flags & S_CLOSING) {
1213                 interruptible_sleep_on(&info->close_wait);
1214 #ifdef SERIAL_DO_RESTART
1215                 if (info->flags & S_HUP_NOTIFY)
1216                         return -EAGAIN;
1217                 else
1218                         return -ERESTARTSYS;
1219 #else
1220                 return -EAGAIN;
1221 #endif
1222         }
1223
1224         /*
1225          * If non-blocking mode is set, or the port is not enabled,
1226          * then make the check up front and then exit.
1227          */
1228         if ((filp->f_flags & O_NONBLOCK) ||
1229             (tty->flags & (1 << TTY_IO_ERROR))) {
1230                 info->flags |= S_NORMAL_ACTIVE;
1231                 return 0;
1232         }
1233
1234         if (tty->termios->c_cflag & CLOCAL)
1235                 do_clocal = 1;
1236
1237         /*
1238          * Block waiting for the carrier detect and the line to become
1239          * free (i.e., not in use by the callout).  While we are in
1240          * this loop, info->count is dropped by one, so that
1241          * rs_close() knows when to free things.  We restore it upon
1242          * exit, either normal or abnormal.
1243          */
1244         retval = 0;
1245         add_wait_queue(&info->open_wait, &wait);
1246
1247         info->count--;
1248         info->blocked_open++;
1249         while (1) {
1250                 local_irq_disable();
1251                 m68k_rtsdtr(info, 1);
1252                 local_irq_enable();
1253                 current->state = TASK_INTERRUPTIBLE;
1254                 if (tty_hung_up_p(filp) ||
1255                     !(info->flags & S_INITIALIZED)) {
1256 #ifdef SERIAL_DO_RESTART
1257                         if (info->flags & S_HUP_NOTIFY)
1258                                 retval = -EAGAIN;
1259                         else
1260                                 retval = -ERESTARTSYS;
1261 #else
1262                         retval = -EAGAIN;
1263 #endif
1264                         break;
1265                 }
1266                 if (!(info->flags & S_CLOSING) && do_clocal)
1267                         break;
1268                 if (signal_pending(current)) {
1269                         retval = -ERESTARTSYS;
1270                         break;
1271                 }
1272                 schedule();
1273         }
1274         current->state = TASK_RUNNING;
1275         remove_wait_queue(&info->open_wait, &wait);
1276         if (!tty_hung_up_p(filp))
1277                 info->count++;
1278         info->blocked_open--;
1279
1280         if (retval)
1281                 return retval;
1282         info->flags |= S_NORMAL_ACTIVE;
1283         return 0;
1284 }
1285
1286 /*
1287  * This routine is called whenever a serial port is opened.  It
1288  * enables interrupts for a serial port, linking in its S structure into
1289  * the IRQ chain.   It also performs the serial-specific
1290  * initialization for the tty structure.
1291  */
1292 int rs_open(struct tty_struct *tty, struct file * filp)
1293 {
1294         struct m68k_serial      *info;
1295         int                     retval, line;
1296
1297         line = tty->index;
1298
1299         if (line >= NR_PORTS || line < 0) /* we have exactly one */
1300                 return -ENODEV;
1301
1302         info = &m68k_soft[line];
1303
1304         if (serial_paranoia_check(info, tty->name, "rs_open"))
1305                 return -ENODEV;
1306
1307         info->count++;
1308         tty->driver_data = info;
1309         info->tty = tty;
1310
1311         /*
1312          * Start up serial port
1313          */
1314         retval = startup(info);
1315         if (retval)
1316                 return retval;
1317
1318         return block_til_ready(tty, filp, info);
1319 }
1320
1321 /* Finally, routines used to initialize the serial driver. */
1322
1323 static void show_serial_version(void)
1324 {
1325         printk("MC68328 serial driver version 1.00\n");
1326 }
1327
1328 #ifdef CONFIG_PM_LEGACY
1329 /* Serial Power management
1330  *  The console (currently fixed at line 0) is a special case for power
1331  *  management because the kernel is so chatty. The console will be
1332  *  explicitly disabled my our power manager as the last minute, so we won't
1333  *  mess with it here.
1334  */
1335 static struct pm_dev *serial_pm[NR_PORTS];
1336
1337 static int serial_pm_callback(struct pm_dev *dev, pm_request_t request, void *data)
1338 {
1339         struct m68k_serial *info = (struct m68k_serial *)dev->data;
1340
1341         if(info == NULL)
1342                 return -1;
1343
1344         /* special case for line 0 - pm restores it */
1345         if(info->line == 0)
1346                 return 0;
1347
1348         switch (request) {
1349         case PM_SUSPEND:
1350                 shutdown(info);
1351                 break;
1352
1353         case PM_RESUME:
1354                 startup(info);
1355                 break;
1356         }
1357         return 0;
1358 }
1359
1360 void shutdown_console(void)
1361 {
1362         struct m68k_serial *info = &m68k_soft[0];
1363
1364         /* HACK: wait a bit for any pending printk's to be dumped */
1365         {
1366                 int i = 10000;
1367                 while(i--);
1368         }
1369
1370         shutdown(info);
1371 }
1372
1373 void startup_console(void)
1374 {
1375         struct m68k_serial *info = &m68k_soft[0];
1376         startup(info);
1377 }
1378 #endif /* CONFIG_PM_LEGACY */
1379
1380
1381 static struct tty_operations rs_ops = {
1382         .open = rs_open,
1383         .close = rs_close,
1384         .write = rs_write,
1385         .flush_chars = rs_flush_chars,
1386         .write_room = rs_write_room,
1387         .chars_in_buffer = rs_chars_in_buffer,
1388         .flush_buffer = rs_flush_buffer,
1389         .ioctl = rs_ioctl,
1390         .throttle = rs_throttle,
1391         .unthrottle = rs_unthrottle,
1392         .set_termios = rs_set_termios,
1393         .stop = rs_stop,
1394         .start = rs_start,
1395         .hangup = rs_hangup,
1396         .set_ldisc = rs_set_ldisc,
1397 };
1398
1399 /* rs_init inits the driver */
1400 static int __init
1401 rs68328_init(void)
1402 {
1403         int flags, i;
1404         struct m68k_serial *info;
1405
1406         serial_driver = alloc_tty_driver(NR_PORTS);
1407         if (!serial_driver)
1408                 return -ENOMEM;
1409
1410         show_serial_version();
1411
1412         /* Initialize the tty_driver structure */
1413         /* SPARC: Not all of this is exactly right for us. */
1414
1415         serial_driver->name = "ttyS";
1416         serial_driver->major = TTY_MAJOR;
1417         serial_driver->minor_start = 64;
1418         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1419         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1420         serial_driver->init_termios = tty_std_termios;
1421         serial_driver->init_termios.c_cflag =
1422                         m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1423         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1424         tty_set_operations(serial_driver, &rs_ops);
1425
1426         if (tty_register_driver(serial_driver)) {
1427                 put_tty_driver(serial_driver);
1428                 printk(KERN_ERR "Couldn't register serial driver\n");
1429                 return -ENOMEM;
1430         }
1431
1432         local_irq_save(flags);
1433
1434         for(i=0;i<NR_PORTS;i++) {
1435
1436             info = &m68k_soft[i];
1437             info->magic = SERIAL_MAGIC;
1438             info->port = (int) &uart_addr[i];
1439             info->tty = 0;
1440             info->irq = uart_irqs[i];
1441             info->custom_divisor = 16;
1442             info->close_delay = 50;
1443             info->closing_wait = 3000;
1444             info->x_char = 0;
1445             info->event = 0;
1446             info->count = 0;
1447             info->blocked_open = 0;
1448             INIT_WORK(&info->tqueue, do_softint, info);
1449             INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
1450             init_waitqueue_head(&info->open_wait);
1451             init_waitqueue_head(&info->close_wait);
1452             info->line = i;
1453             info->is_cons = 1; /* Means shortcuts work */
1454
1455             printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1456                    info->port, info->irq);
1457             printk(" is a builtin MC68328 UART\n");
1458
1459             IRQ_ports[info->irq] = info;        /* waste of space */
1460
1461 #ifdef CONFIG_M68VZ328
1462                 if (i > 0 )
1463                         PJSEL &= 0xCF;  /* PSW enable second port output */
1464 #endif
1465
1466             if (request_irq(uart_irqs[i],
1467                             rs_interrupt,
1468                             IRQ_FLG_STD,
1469                             "M68328_UART", NULL))
1470                 panic("Unable to attach 68328 serial interrupt\n");
1471 #ifdef CONFIG_PM_LEGACY
1472             serial_pm[i] = pm_register(PM_SYS_DEV, PM_SYS_COM, serial_pm_callback);
1473             if (serial_pm[i])
1474                     serial_pm[i]->data = info;
1475 #endif
1476         }
1477         local_irq_restore(flags);
1478         return 0;
1479 }
1480
1481 module_init(rs68328_init);
1482
1483
1484
1485 static void m68328_set_baud(void)
1486 {
1487         unsigned short ustcnt;
1488         int     i;
1489
1490         ustcnt = USTCNT;
1491         USTCNT = ustcnt & ~USTCNT_TXEN;
1492
1493 again:
1494         for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++)
1495                 if (baud_table[i] == m68328_console_baud)
1496                         break;
1497         if (i >= sizeof(baud_table) / sizeof(baud_table[0])) {
1498                 m68328_console_baud = 9600;
1499                 goto again;
1500         }
1501
1502         UBAUD = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) |
1503                 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1504         ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1505         ustcnt |= USTCNT_8_7;
1506         ustcnt |= USTCNT_TXEN;
1507         USTCNT = ustcnt;
1508         m68328_console_initted = 1;
1509         return;
1510 }
1511
1512
1513 int m68328_console_setup(struct console *cp, char *arg)
1514 {
1515         int             i, n = CONSOLE_BAUD_RATE;
1516
1517         if (!cp)
1518                 return(-1);
1519
1520         if (arg)
1521                 n = simple_strtoul(arg,NULL,0);
1522
1523         for (i = 0; i < BAUD_TABLE_SIZE; i++)
1524                 if (baud_table[i] == n)
1525                         break;
1526         if (i < BAUD_TABLE_SIZE) {
1527                 m68328_console_baud = n;
1528                 m68328_console_cbaud = 0;
1529                 if (i > 15) {
1530                         m68328_console_cbaud |= CBAUDEX;
1531                         i -= 15;
1532                 }
1533                 m68328_console_cbaud |= i;
1534         }
1535
1536         m68328_set_baud(); /* make sure baud rate changes */
1537         return(0);
1538 }
1539
1540
1541 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1542 {
1543         *index = c->index;
1544         return serial_driver;
1545 }
1546
1547
1548 void m68328_console_write (struct console *co, const char *str,
1549                            unsigned int count)
1550 {
1551         if (!m68328_console_initted)
1552                 m68328_set_baud();
1553     while (count--) {
1554         if (*str == '\n')
1555            rs_put_char('\r');
1556         rs_put_char( *str++ );
1557     }
1558 }
1559
1560
1561 static struct console m68328_driver = {
1562         .name           = "ttyS",
1563         .write          = m68328_console_write,
1564         .device         = m68328_console_device,
1565         .setup          = m68328_console_setup,
1566         .flags          = CON_PRINTBUFFER,
1567         .index          = -1,
1568 };
1569
1570
1571 static int __init m68328_console_init(void)
1572 {
1573         register_console(&m68328_driver);
1574         return 0;
1575 }
1576
1577 console_initcall(m68328_console_init);