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/config.h>
27 #include <linux/major.h>
28 #include <linux/string.h>
29 #include <linux/fcntl.h>
30 #include <linux/mm.h>
31 #include <linux/kernel.h>
32 #include <linux/console.h>
33 #include <linux/reboot.h>
34 #include <linux/keyboard.h>
35 #include <linux/init.h>
36 #include <linux/pm.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/segment.h>
44 #include <asm/delay.h>
45 #include <asm/uaccess.h>
46
47 /* (es) */
48 /* note: perhaps we can murge these files, so that you can just
49 * define 1 of them, and they can sort that out for themselves
50 */
51 #if defined(CONFIG_M68EZ328)
52 #include <asm/MC68EZ328.h>
53 #else
54 #if defined(CONFIG_M68VZ328)
55 #include <asm/MC68VZ328.h>
56 #else
57 #include <asm/MC68328.h>
58 #endif /* CONFIG_M68VZ328 */
59 #endif /* CONFIG_M68EZ328 */
60
61 #include "68328serial.h"
62
63 /* Turn off usage of real serial interrupt code, to "support" Copilot */
64 #ifdef CONFIG_XCOPILOT_BUGS
65 #undef USE_INTS
66 #else
67 #define USE_INTS
68 #endif
69
70 static struct m68k_serial m68k_soft[NR_PORTS];
71 struct m68k_serial *IRQ_ports[NR_IRQS];
72
73 static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
74
75 /* multiple ports are contiguous in memory */
76 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
77
78 struct tty_struct m68k_ttys;
79 struct m68k_serial *m68k_consinfo = 0;
80
81 #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
82
83 #ifdef CONFIG_CONSOLE
84 extern wait_queue_head_t keypress_wait;
85 #endif
86
87 struct tty_driver *serial_driver;
88
89 /* serial subtype definitions */
90 #define SERIAL_TYPE_NORMAL 1
91
92 /* number of characters left in xmit buffer before we ask for more */
93 #define WAKEUP_CHARS 256
94
95 /* Debugging... DEBUG_INTR is bad to use when one of the zs
96 * lines is your console ;(
97 */
98 #undef SERIAL_DEBUG_INTR
99 #undef SERIAL_DEBUG_OPEN
100 #undef SERIAL_DEBUG_FLOW
101
102 #define RS_ISR_PASS_LIMIT 256
103
104 #define _INLINE_ inline
105
106 static void change_speed(struct m68k_serial *info);
107
108 /*
109 * Setup for console. Argument comes from the boot command line.
110 */
111
112 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
113 #define CONSOLE_BAUD_RATE 115200
114 #define DEFAULT_CBAUD B115200
115 #else
116 /* (es) */
117 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
118 #ifdef CONFIG_M68VZ328
119 #define CONSOLE_BAUD_RATE 19200
120 #define DEFAULT_CBAUD B19200
121 #endif
122 /* (/es) */
123 #endif
124
125 #ifndef CONSOLE_BAUD_RATE
126 #define CONSOLE_BAUD_RATE 9600
127 #define DEFAULT_CBAUD B9600
128 #endif
129
130
131 static int m68328_console_initted = 0;
132 static int m68328_console_baud = CONSOLE_BAUD_RATE;
133 static int m68328_console_cbaud = DEFAULT_CBAUD;
134
135
136 /*
137 * tmp_buf is used as a temporary buffer by serial_write. We need to
138 * lock it in case the memcpy_fromfs blocks while swapping in a page,
139 * and some other program tries to do a serial write at the same time.
140 * Since the lock will only come under contention when the system is
141 * swapping and available memory is low, it makes sense to share one
142 * buffer across all the serial ports, since it significantly saves
143 * memory if large numbers of serial ports are open.
144 */
145 static unsigned char tmp_buf[SERIAL_XMIT_SIZE]; /* This is cheating */
146 DECLARE_MUTEX(tmp_buf_sem);
147
148 static inline int serial_paranoia_check(struct m68k_serial *info,
149 char *name, const char *routine)
150 {
151 #ifdef SERIAL_PARANOIA_CHECK
152 static const char *badmagic =
153 "Warning: bad magic number for serial struct %s in %s\n";
154 static const char *badinfo =
155 "Warning: null m68k_serial for %s in %s\n";
156
157 if (!info) {
158 printk(badinfo, name, routine);
159 return 1;
160 }
161 if (info->magic != SERIAL_MAGIC) {
162 printk(badmagic, name, routine);
163 return 1;
164 }
165 #endif
166 return 0;
167 }
168
169 /*
170 * This is used to figure out the divisor speeds and the timeouts
171 */
172 static int baud_table[] = {
173 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
174 9600, 19200, 38400, 57600, 115200, 0 };
175
176 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
177
178 /* Sets or clears DTR/RTS on the requested line */
179 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
180 {
181 if (set) {
182 /* set the RTS/CTS line */
183 } else {
184 /* clear it */
185 }
186 return;
187 }
188
189 /* Utility routines */
190 static inline int get_baud(struct m68k_serial *ss)
191 {
192 unsigned long result = 115200;
193 unsigned short int baud = uart_addr[ss->line].ubaud;
194 if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
195 result >>= GET_FIELD(baud, UBAUD_DIVIDE);
196
197 return result;
198 }
199
200 /*
201 * ------------------------------------------------------------
202 * rs_stop() and rs_start()
203 *
204 * This routines are called before setting or resetting tty->stopped.
205 * They enable or disable transmitter interrupts, as necessary.
206 * ------------------------------------------------------------
207 */
208 static void rs_stop(struct tty_struct *tty)
209 {
210 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
211 m68328_uart *uart = &uart_addr[info->line];
212 unsigned long flags;
213
214 if (serial_paranoia_check(info, tty->name, "rs_stop"))
215 return;
216
217 save_flags(flags); cli();
218 uart->ustcnt &= ~USTCNT_TXEN;
219 restore_flags(flags);
220 }
221
222 static void rs_put_char(char ch)
223 {
224 int flags, loops = 0;
225
226 save_flags(flags); cli();
227
228 while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
229 loops++;
230 udelay(5);
231 }
232
233 UTX_TXDATA = ch;
234 udelay(5);
235 restore_flags(flags);
236 }
237
238 static void rs_start(struct tty_struct *tty)
239 {
240 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
241 m68328_uart *uart = &uart_addr[info->line];
242 unsigned long flags;
243
244 if (serial_paranoia_check(info, tty->name, "rs_start"))
245 return;
246
247 save_flags(flags); cli();
248 if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
249 #ifdef USE_INTS
250 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
251 #else
252 uart->ustcnt |= USTCNT_TXEN;
253 #endif
254 }
255 restore_flags(flags);
256 }
257
258 /* Drop into either the boot monitor or kadb upon receiving a break
259 * from keyboard/console input.
260 */
261 static void batten_down_hatches(void)
262 {
263 /* Drop into the debugger */
264 }
265
266 static _INLINE_ void status_handle(struct m68k_serial *info, unsigned short status)
267 {
268 #if 0
269 if(status & DCD) {
270 if((info->tty->termios->c_cflag & CRTSCTS) &&
271 ((info->curregs[3] & AUTO_ENAB)==0)) {
272 info->curregs[3] |= AUTO_ENAB;
273 info->pendregs[3] |= AUTO_ENAB;
274 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
275 }
276 } else {
277 if((info->curregs[3] & AUTO_ENAB)) {
278 info->curregs[3] &= ~AUTO_ENAB;
279 info->pendregs[3] &= ~AUTO_ENAB;
280 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
281 }
282 }
283 #endif
284 /* If this is console input and this is a
285 * 'break asserted' status change interrupt
286 * see if we can drop into the debugger
287 */
288 if((status & URX_BREAK) && info->break_abort)
289 batten_down_hatches();
290 return;
291 }
292
293 static _INLINE_ void receive_chars(struct m68k_serial *info, struct pt_regs *regs, unsigned short rx)
294 {
295 struct tty_struct *tty = info->tty;
296 m68328_uart *uart = &uart_addr[info->line];
297 unsigned char ch;
298
299 /*
300 * This do { } while() loop will get ALL chars out of Rx FIFO
301 */
302 #ifndef CONFIG_XCOPILOT_BUGS
303 do {
304 #endif
305 ch = GET_FIELD(rx, URX_RXDATA);
306
307 if(info->is_cons) {
308 if(URX_BREAK & rx) { /* whee, break received */
309 status_handle(info, rx);
310 return;
311 #ifdef CONFIG_MAGIC_SYSRQ
312 } else if (ch == 0x10) { /* ^P */
313 show_state();
314 show_free_areas();
315 show_buffers();
316 /* show_net_buffers(); */
317 return;
318 } else if (ch == 0x12) { /* ^R */
319 machine_restart(NULL);
320 return;
321 #endif /* CONFIG_MAGIC_SYSRQ */
322 }
323 /* It is a 'keyboard interrupt' ;-) */
324 #ifdef CONFIG_CONSOLE
325 wake_up(&keypress_wait);
326 #endif
327 }
328
329 if(!tty)
330 goto clear_and_exit;
331
332 /*
333 * Make sure that we do not overflow the buffer
334 */
335 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
336 schedule_work(&tty->flip.work);
337 return;
338 }
339
340 if(rx & URX_PARITY_ERROR) {
341 *tty->flip.flag_buf_ptr++ = TTY_PARITY;
342 status_handle(info, rx);
343 } else if(rx & URX_OVRUN) {
344 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
345 status_handle(info, rx);
346 } else if(rx & URX_FRAME_ERROR) {
347 *tty->flip.flag_buf_ptr++ = TTY_FRAME;
348 status_handle(info, rx);
349 } else {
350 *tty->flip.flag_buf_ptr++ = 0; /* XXX */
351 }
352 *tty->flip.char_buf_ptr++ = ch;
353 tty->flip.count++;
354
355 #ifndef CONFIG_XCOPILOT_BUGS
356 } while((rx = uart->urx.w) & URX_DATA_READY);
357 #endif
358
359 schedule_work(&tty->flip.work);
360
361 clear_and_exit:
362 return;
363 }
364
365 static _INLINE_ void transmit_chars(struct m68k_serial *info)
366 {
367 m68328_uart *uart = &uart_addr[info->line];
368
369 if (info->x_char) {
370 /* Send next char */
371 uart->utx.b.txdata = info->x_char;
372 info->x_char = 0;
373 goto clear_and_return;
374 }
375
376 if((info->xmit_cnt <= 0) || info->tty->stopped) {
377 /* That's peculiar... TX ints off */
378 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
379 goto clear_and_return;
380 }
381
382 /* Send char */
383 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
384 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
385 info->xmit_cnt--;
386
387 if (info->xmit_cnt < WAKEUP_CHARS)
388 schedule_work(&info->tqueue);
389
390 if(info->xmit_cnt <= 0) {
391 /* All done for now... TX ints off */
392 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
393 goto clear_and_return;
394 }
395
396 clear_and_return:
397 /* Clear interrupt (should be auto)*/
398 return;
399 }
400
401 /*
402 * This is the serial driver's generic interrupt routine
403 */
404 irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
405 {
406 struct m68k_serial * info;
407 m68328_uart *uart;
408 unsigned short rx;
409 unsigned short tx;
410
411 info = IRQ_ports[irq];
412 if(!info)
413 return IRQ_NONE;
414
415 uart = &uart_addr[info->line];
416 rx = uart->urx.w;
417
418 #ifdef USE_INTS
419 tx = uart->utx.w;
420
421 if (rx & URX_DATA_READY) receive_chars(info, regs, rx);
422 if (tx & UTX_TX_AVAIL) transmit_chars(info);
423 #else
424 receive_chars(info, regs, rx);
425 #endif
426 return IRQ_HANDLED;
427 }
428
429 static void do_softint(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 #if 0
438 if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
439 tty_wakeup(tty);
440 }
441 #endif
442 }
443
444 /*
445 * This routine is called from the scheduler tqueue when the interrupt
446 * routine has signalled that a hangup has occurred. The path of
447 * hangup processing is:
448 *
449 * serial interrupt routine -> (scheduler tqueue) ->
450 * do_serial_hangup() -> tty->hangup() -> rs_hangup()
451 *
452 */
453 static void do_serial_hangup(void *private)
454 {
455 struct m68k_serial *info = (struct m68k_serial *) private;
456 struct tty_struct *tty;
457
458 tty = info->tty;
459 if (!tty)
460 return;
461
462 tty_hangup(tty);
463 }
464
465
466 static int startup(struct m68k_serial * info)
467 {
468 m68328_uart *uart = &uart_addr[info->line];
469 unsigned long flags;
470
471 if (info->flags & S_INITIALIZED)
472 return 0;
473
474 if (!info->xmit_buf) {
475 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
476 if (!info->xmit_buf)
477 return -ENOMEM;
478 }
479
480 save_flags(flags); cli();
481
482 /*
483 * Clear the FIFO buffers and disable them
484 * (they will be reenabled in change_speed())
485 */
486
487 uart->ustcnt = USTCNT_UEN;
488 info->xmit_fifo_size = 1;
489 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
490 (void)uart->urx.w;
491
492 /*
493 * Finally, enable sequencing and interrupts
494 */
495 #ifdef USE_INTS
496 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
497 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
498 #else
499 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
500 #endif
501
502 if (info->tty)
503 clear_bit(TTY_IO_ERROR, &info->tty->flags);
504 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
505
506 /*
507 * and set the speed of the serial port
508 */
509
510 change_speed(info);
511
512 info->flags |= S_INITIALIZED;
513 restore_flags(flags);
514 return 0;
515 }
516
517 /*
518 * This routine will shutdown a serial port; interrupts are disabled, and
519 * DTR is dropped if the hangup on close termio flag is on.
520 */
521 static void shutdown(struct m68k_serial * info)
522 {
523 m68328_uart *uart = &uart_addr[info->line];
524 unsigned long flags;
525
526 uart->ustcnt = 0; /* All off! */
527 if (!(info->flags & S_INITIALIZED))
528 return;
529
530 save_flags(flags); cli(); /* Disable interrupts */
531
532 if (info->xmit_buf) {
533 free_page((unsigned long) info->xmit_buf);
534 info->xmit_buf = 0;
535 }
536
537 if (info->tty)
538 set_bit(TTY_IO_ERROR, &info->tty->flags);
539
540 info->flags &= ~S_INITIALIZED;
541 restore_flags(flags);
542 }
543
544 struct {
545 int divisor, prescale;
546 }
547 #ifndef CONFIG_M68VZ328
548 hw_baud_table[18] = {
549 {0,0}, /* 0 */
550 {0,0}, /* 50 */
551 {0,0}, /* 75 */
552 {0,0}, /* 110 */
553 {0,0}, /* 134 */
554 {0,0}, /* 150 */
555 {0,0}, /* 200 */
556 {7,0x26}, /* 300 */
557 {6,0x26}, /* 600 */
558 {5,0x26}, /* 1200 */
559 {0,0}, /* 1800 */
560 {4,0x26}, /* 2400 */
561 {3,0x26}, /* 4800 */
562 {2,0x26}, /* 9600 */
563 {1,0x26}, /* 19200 */
564 {0,0x26}, /* 38400 */
565 {1,0x38}, /* 57600 */
566 {0,0x38}, /* 115200 */
567 };
568 #else
569 hw_baud_table[18] = {
570 {0,0}, /* 0 */
571 {0,0}, /* 50 */
572 {0,0}, /* 75 */
573 {0,0}, /* 110 */
574 {0,0}, /* 134 */
575 {0,0}, /* 150 */
576 {0,0}, /* 200 */
577 {0,0}, /* 300 */
578 {7,0x26}, /* 600 */
579 {6,0x26}, /* 1200 */
580 {0,0}, /* 1800 */
581 {5,0x26}, /* 2400 */
582 {4,0x26}, /* 4800 */
583 {3,0x26}, /* 9600 */
584 {2,0x26}, /* 19200 */
585 {1,0x26}, /* 38400 */
586 {0,0x26}, /* 57600 */
587 {1,0x38}, /* 115200 */
588 };
589 #endif
590 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
591
592 /*
593 * This routine is called to set the UART divisor registers to match
594 * the specified baud rate for a serial port.
595 */
596 static void change_speed(struct m68k_serial *info)
597 {
598 m68328_uart *uart = &uart_addr[info->line];
599 unsigned short port;
600 unsigned short ustcnt;
601 unsigned cflag;
602 int i;
603
604 if (!info->tty || !info->tty->termios)
605 return;
606 cflag = info->tty->termios->c_cflag;
607 if (!(port = info->port))
608 return;
609
610 ustcnt = uart->ustcnt;
611 uart->ustcnt = ustcnt & ~USTCNT_TXEN;
612
613 i = cflag & CBAUD;
614 if (i & CBAUDEX) {
615 i = (i & ~CBAUDEX) + B38400;
616 }
617
618 info->baud = baud_table[i];
619 uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
620 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
621
622 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
623
624 if ((cflag & CSIZE) == CS8)
625 ustcnt |= USTCNT_8_7;
626
627 if (cflag & CSTOPB)
628 ustcnt |= USTCNT_STOP;
629
630 if (cflag & PARENB)
631 ustcnt |= USTCNT_PARITYEN;
632 if (cflag & PARODD)
633 ustcnt |= USTCNT_ODD_EVEN;
634
635 #ifdef CONFIG_SERIAL_68328_RTS_CTS
636 if (cflag & CRTSCTS) {
637 uart->utx.w &= ~ UTX_NOCTS;
638 } else {
639 uart->utx.w |= UTX_NOCTS;
640 }
641 #endif
642
643 ustcnt |= USTCNT_TXEN;
644
645 uart->ustcnt = ustcnt;
646 return;
647 }
648
649 /*
650 * Fair output driver allows a process to speak.
651 */
652 static void rs_fair_output(void)
653 {
654 int left; /* Output no more than that */
655 unsigned long flags;
656 struct m68k_serial *info = &m68k_soft[0];
657 char c;
658
659 if (info == 0) return;
660 if (info->xmit_buf == 0) return;
661
662 save_flags(flags); cli();
663 left = info->xmit_cnt;
664 while (left != 0) {
665 c = info->xmit_buf[info->xmit_tail];
666 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
667 info->xmit_cnt--;
668 restore_flags(flags);
669
670 rs_put_char(c);
671
672 save_flags(flags); cli();
673 left = min(info->xmit_cnt, left-1);
674 }
675
676 /* Last character is being transmitted now (hopefully). */
677 udelay(5);
678
679 restore_flags(flags);
680 return;
681 }
682
683 /*
684 * m68k_console_print is registered for printk.
685 */
686 void console_print_68328(const char *p)
687 {
688 char c;
689
690 while((c=*(p++)) != 0) {
691 if(c == '\n')
692 rs_put_char('\r');
693 rs_put_char(c);
694 }
695
696 /* Comment this if you want to have a strict interrupt-driven output */
697 rs_fair_output();
698
699 return;
700 }
701
702 static void rs_set_ldisc(struct tty_struct *tty)
703 {
704 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
705
706 if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
707 return;
708
709 info->is_cons = (tty->termios->c_line == N_TTY);
710
711 printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
712 }
713
714 static void rs_flush_chars(struct tty_struct *tty)
715 {
716 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
717 m68328_uart *uart = &uart_addr[info->line];
718 unsigned long flags;
719
720 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
721 return;
722 #ifndef USE_INTS
723 for(;;) {
724 #endif
725
726 /* Enable transmitter */
727 save_flags(flags); cli();
728
729 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
730 !info->xmit_buf) {
731 restore_flags(flags);
732 return;
733 }
734
735 #ifdef USE_INTS
736 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
737 #else
738 uart->ustcnt |= USTCNT_TXEN;
739 #endif
740
741 #ifdef USE_INTS
742 if (uart->utx.w & UTX_TX_AVAIL) {
743 #else
744 if (1) {
745 #endif
746 /* Send char */
747 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
748 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
749 info->xmit_cnt--;
750 }
751
752 #ifndef USE_INTS
753 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
754 }
755 #endif
756 restore_flags(flags);
757 }
758
759 extern void console_printn(const char * b, int count);
760
761 static int rs_write(struct tty_struct * tty,
762 const unsigned char *buf, int count)
763 {
764 int c, total = 0;
765 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
766 m68328_uart *uart = &uart_addr[info->line];
767 unsigned long flags;
768
769 if (serial_paranoia_check(info, tty->name, "rs_write"))
770 return 0;
771
772 if (!tty || !info->xmit_buf)
773 return 0;
774
775 save_flags(flags);
776 while (1) {
777 cli();
778 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
779 SERIAL_XMIT_SIZE - info->xmit_head));
780 if (c <= 0)
781 break;
782
783 memcpy(info->xmit_buf + info->xmit_head, buf, c);
784 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
785 info->xmit_cnt += c;
786 restore_flags(flags);
787 buf += c;
788 count -= c;
789 total += c;
790 }
791
792 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
793 /* Enable transmitter */
794 cli();
795 #ifndef USE_INTS
796 while(info->xmit_cnt) {
797 #endif
798
799 uart->ustcnt |= USTCNT_TXEN;
800 #ifdef USE_INTS
801 uart->ustcnt |= USTCNT_TX_INTR_MASK;
802 #else
803 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
804 #endif
805 if (uart->utx.w & UTX_TX_AVAIL) {
806 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
807 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
808 info->xmit_cnt--;
809 }
810
811 #ifndef USE_INTS
812 }
813 #endif
814 restore_flags(flags);
815 }
816 restore_flags(flags);
817 return total;
818 }
819
820 static int rs_write_room(struct tty_struct *tty)
821 {
822 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
823 int ret;
824
825 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
826 return 0;
827 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
828 if (ret < 0)
829 ret = 0;
830 return ret;
831 }
832
833 static int rs_chars_in_buffer(struct tty_struct *tty)
834 {
835 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
836
837 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
838 return 0;
839 return info->xmit_cnt;
840 }
841
842 static void rs_flush_buffer(struct tty_struct *tty)
843 {
844 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
845
846 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
847 return;
848 cli();
849 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
850 sti();
851 tty_wakeup(tty);
852 }
853
854 /*
855 * ------------------------------------------------------------
856 * rs_throttle()
857 *
858 * This routine is called by the upper-layer tty layer to signal that
859 * incoming characters should be throttled.
860 * ------------------------------------------------------------
861 */
862 static void rs_throttle(struct tty_struct * tty)
863 {
864 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
865
866 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
867 return;
868
869 if (I_IXOFF(tty))
870 info->x_char = STOP_CHAR(tty);
871
872 /* Turn off RTS line (do this atomic) */
873 }
874
875 static void rs_unthrottle(struct tty_struct * tty)
876 {
877 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
878
879 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
880 return;
881
882 if (I_IXOFF(tty)) {
883 if (info->x_char)
884 info->x_char = 0;
885 else
886 info->x_char = START_CHAR(tty);
887 }
888
889 /* Assert RTS line (do this atomic) */
890 }
891
892 /*
893 * ------------------------------------------------------------
894 * rs_ioctl() and friends
895 * ------------------------------------------------------------
896 */
897
898 static int get_serial_info(struct m68k_serial * info,
899 struct serial_struct * retinfo)
900 {
901 struct serial_struct tmp;
902
903 if (!retinfo)
904 return -EFAULT;
905 memset(&tmp, 0, sizeof(tmp));
906 tmp.type = info->type;
907 tmp.line = info->line;
908 tmp.port = info->port;
909 tmp.irq = info->irq;
910 tmp.flags = info->flags;
911 tmp.baud_base = info->baud_base;
912 tmp.close_delay = info->close_delay;
913 tmp.closing_wait = info->closing_wait;
914 tmp.custom_divisor = info->custom_divisor;
915 copy_to_user(retinfo,&tmp,sizeof(*retinfo));
916 return 0;
917 }
918
919 static int set_serial_info(struct m68k_serial * info,
920 struct serial_struct * new_info)
921 {
922 struct serial_struct new_serial;
923 struct m68k_serial old_info;
924 int retval = 0;
925
926 if (!new_info)
927 return -EFAULT;
928 copy_from_user(&new_serial,new_info,sizeof(new_serial));
929 old_info = *info;
930
931 if (!capable(CAP_SYS_ADMIN)) {
932 if ((new_serial.baud_base != info->baud_base) ||
933 (new_serial.type != info->type) ||
934 (new_serial.close_delay != info->close_delay) ||
935 ((new_serial.flags & ~S_USR_MASK) !=
936 (info->flags & ~S_USR_MASK)))
937 return -EPERM;
938 info->flags = ((info->flags & ~S_USR_MASK) |
939 (new_serial.flags & S_USR_MASK));
940 info->custom_divisor = new_serial.custom_divisor;
941 goto check_and_exit;
942 }
943
944 if (info->count > 1)
945 return -EBUSY;
946
947 /*
948 * OK, past this point, all the error checking has been done.
949 * At this point, we start making changes.....
950 */
951
952 info->baud_base = new_serial.baud_base;
953 info->flags = ((info->flags & ~S_FLAGS) |
954 (new_serial.flags & S_FLAGS));
955 info->type = new_serial.type;
956 info->close_delay = new_serial.close_delay;
957 info->closing_wait = new_serial.closing_wait;
958
959 check_and_exit:
960 retval = startup(info);
961 return retval;
962 }
963
964 /*
965 * get_lsr_info - get line status register info
966 *
967 * Purpose: Let user call ioctl() to get info when the UART physically
968 * is emptied. On bus types like RS485, the transmitter must
969 * release the bus after transmitting. This must be done when
970 * the transmit shift register is empty, not be done when the
971 * transmit holding register is empty. This functionality
972 * allows an RS485 driver to be written in user space.
973 */
974 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
975 {
976 #ifdef CONFIG_SERIAL_68328_RTS_CTS
977 m68328_uart *uart = &uart_addr[info->line];
978 #endif
979 unsigned char status;
980
981 cli();
982 #ifdef CONFIG_SERIAL_68328_RTS_CTS
983 status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
984 #else
985 status = 0;
986 #endif
987 sti();
988 put_user(status,value);
989 return 0;
990 }
991
992 /*
993 * This routine sends a break character out the serial port.
994 */
995 static void send_break( struct m68k_serial * info, int duration)
996 {
997 m68328_uart *uart = &uart_addr[info->line];
998 unsigned long flags;
999 if (!info->port)
1000 return;
1001 set_current_state(TASK_INTERRUPTIBLE);
1002 save_flags(flags);
1003 cli();
1004 #ifdef USE_INTS
1005 uart->utx.w |= UTX_SEND_BREAK;
1006 schedule_timeout(duration);
1007 uart->utx.w &= ~UTX_SEND_BREAK;
1008 #endif
1009 restore_flags(flags);
1010 }
1011
1012 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1013 unsigned int cmd, unsigned long arg)
1014 {
1015 int error;
1016 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1017 int retval;
1018
1019 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1020 return -ENODEV;
1021
1022 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1023 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1024 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1025 if (tty->flags & (1 << TTY_IO_ERROR))
1026 return -EIO;
1027 }
1028
1029 switch (cmd) {
1030 case TCSBRK: /* SVID version: non-zero arg --> no break */
1031 retval = tty_check_change(tty);
1032 if (retval)
1033 return retval;
1034 tty_wait_until_sent(tty, 0);
1035 if (!arg)
1036 send_break(info, HZ/4); /* 1/4 second */
1037 return 0;
1038 case TCSBRKP: /* support for POSIX tcsendbreak() */
1039 retval = tty_check_change(tty);
1040 if (retval)
1041 return retval;
1042 tty_wait_until_sent(tty, 0);
1043 send_break(info, arg ? arg*(HZ/10) : HZ/4);
1044 return 0;
1045 case TIOCGSOFTCAR:
1046 error = put_user(C_CLOCAL(tty) ? 1 : 0,
1047 (unsigned long *) arg);
1048 if (error)
1049 return error;
1050 return 0;
1051 case TIOCSSOFTCAR:
1052 get_user(arg, (unsigned long *) arg);
1053 tty->termios->c_cflag =
1054 ((tty->termios->c_cflag & ~CLOCAL) |
1055 (arg ? CLOCAL : 0));
1056 return 0;
1057 case TIOCGSERIAL:
1058 error = verify_area(VERIFY_WRITE, (void *) arg,
1059 sizeof(struct serial_struct));
1060 if (error)
1061 return error;
1062 return get_serial_info(info,
1063 (struct serial_struct *) arg);
1064 case TIOCSSERIAL:
1065 return set_serial_info(info,
1066 (struct serial_struct *) arg);
1067 case TIOCSERGETLSR: /* Get line status register */
1068 error = verify_area(VERIFY_WRITE, (void *) arg,
1069 sizeof(unsigned int));
1070 if (error)
1071 return error;
1072 else
1073 return get_lsr_info(info, (unsigned int *) arg);
1074
1075 case TIOCSERGSTRUCT:
1076 error = verify_area(VERIFY_WRITE, (void *) arg,
1077 sizeof(struct m68k_serial));
1078 if (error)
1079 return error;
1080 copy_to_user((struct m68k_serial *) arg,
1081 info, sizeof(struct m68k_serial));
1082 return 0;
1083
1084 default:
1085 return -ENOIOCTLCMD;
1086 }
1087 return 0;
1088 }
1089
1090 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1091 {
1092 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1093
1094 if (tty->termios->c_cflag == old_termios->c_cflag)
1095 return;
1096
1097 change_speed(info);
1098
1099 if ((old_termios->c_cflag & CRTSCTS) &&
1100 !(tty->termios->c_cflag & CRTSCTS)) {
1101 tty->hw_stopped = 0;
1102 rs_start(tty);
1103 }
1104
1105 }
1106
1107 /*
1108 * ------------------------------------------------------------
1109 * rs_close()
1110 *
1111 * This routine is called when the serial port gets closed. First, we
1112 * wait for the last remaining data to be sent. Then, we unlink its
1113 * S structure from the interrupt chain if necessary, and we free
1114 * that IRQ if nothing is left in the chain.
1115 * ------------------------------------------------------------
1116 */
1117 static void rs_close(struct tty_struct *tty, struct file * filp)
1118 {
1119 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1120 m68328_uart *uart = &uart_addr[info->line];
1121 unsigned long flags;
1122
1123 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1124 return;
1125
1126 save_flags(flags); cli();
1127
1128 if (tty_hung_up_p(filp)) {
1129 restore_flags(flags);
1130 return;
1131 }
1132
1133 if ((tty->count == 1) && (info->count != 1)) {
1134 /*
1135 * Uh, oh. tty->count is 1, which means that the tty
1136 * structure will be freed. Info->count should always
1137 * be one in these conditions. If it's greater than
1138 * one, we've got real problems, since it means the
1139 * serial port won't be shutdown.
1140 */
1141 printk("rs_close: bad serial port count; tty->count is 1, "
1142 "info->count is %d\n", info->count);
1143 info->count = 1;
1144 }
1145 if (--info->count < 0) {
1146 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1147 info->line, info->count);
1148 info->count = 0;
1149 }
1150 if (info->count) {
1151 restore_flags(flags);
1152 return;
1153 }
1154 info->flags |= S_CLOSING;
1155 /*
1156 * Now we wait for the transmit buffer to clear; and we notify
1157 * the line discipline to only process XON/XOFF characters.
1158 */
1159 tty->closing = 1;
1160 if (info->closing_wait != S_CLOSING_WAIT_NONE)
1161 tty_wait_until_sent(tty, info->closing_wait);
1162 /*
1163 * At this point we stop accepting input. To do this, we
1164 * disable the receive line status interrupts, and tell the
1165 * interrupt driver to stop checking the data ready bit in the
1166 * line status register.
1167 */
1168
1169 uart->ustcnt &= ~USTCNT_RXEN;
1170 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1171
1172 shutdown(info);
1173 if (tty->driver->flush_buffer)
1174 tty->driver->flush_buffer(tty);
1175
1176 tty_ldisc_flush(tty);
1177 tty->closing = 0;
1178 info->event = 0;
1179 info->tty = 0;
1180 #warning "This is not and has never been valid so fix it"
1181 #if 0
1182 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1183 if (tty->ldisc.close)
1184 (tty->ldisc.close)(tty);
1185 tty->ldisc = ldiscs[N_TTY];
1186 tty->termios->c_line = N_TTY;
1187 if (tty->ldisc.open)
1188 (tty->ldisc.open)(tty);
1189 }
1190 #endif
1191 if (info->blocked_open) {
1192 if (info->close_delay) {
1193 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1194 }
1195 wake_up_interruptible(&info->open_wait);
1196 }
1197 info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1198 wake_up_interruptible(&info->close_wait);
1199 restore_flags(flags);
1200 }
1201
1202 /*
1203 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1204 */
1205 void rs_hangup(struct tty_struct *tty)
1206 {
1207 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1208
1209 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1210 return;
1211
1212 rs_flush_buffer(tty);
1213 shutdown(info);
1214 info->event = 0;
1215 info->count = 0;
1216 info->flags &= ~S_NORMAL_ACTIVE;
1217 info->tty = 0;
1218 wake_up_interruptible(&info->open_wait);
1219 }
1220
1221 /*
1222 * ------------------------------------------------------------
1223 * rs_open() and friends
1224 * ------------------------------------------------------------
1225 */
1226 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1227 struct m68k_serial *info)
1228 {
1229 DECLARE_WAITQUEUE(wait, current);
1230 int retval;
1231 int do_clocal = 0;
1232
1233 /*
1234 * If the device is in the middle of being closed, then block
1235 * until it's done, and then try again.
1236 */
1237 if (info->flags & S_CLOSING) {
1238 interruptible_sleep_on(&info->close_wait);
1239 #ifdef SERIAL_DO_RESTART
1240 if (info->flags & S_HUP_NOTIFY)
1241 return -EAGAIN;
1242 else
1243 return -ERESTARTSYS;
1244 #else
1245 return -EAGAIN;
1246 #endif
1247 }
1248
1249 /*
1250 * If non-blocking mode is set, or the port is not enabled,
1251 * then make the check up front and then exit.
1252 */
1253 if ((filp->f_flags & O_NONBLOCK) ||
1254 (tty->flags & (1 << TTY_IO_ERROR))) {
1255 info->flags |= S_NORMAL_ACTIVE;
1256 return 0;
1257 }
1258
1259 if (tty->termios->c_cflag & CLOCAL)
1260 do_clocal = 1;
1261
1262 /*
1263 * Block waiting for the carrier detect and the line to become
1264 * free (i.e., not in use by the callout). While we are in
1265 * this loop, info->count is dropped by one, so that
1266 * rs_close() knows when to free things. We restore it upon
1267 * exit, either normal or abnormal.
1268 */
1269 retval = 0;
1270 add_wait_queue(&info->open_wait, &wait);
1271
1272 info->count--;
1273 info->blocked_open++;
1274 while (1) {
1275 cli();
1276 m68k_rtsdtr(info, 1);
1277 sti();
1278 current->state = TASK_INTERRUPTIBLE;
1279 if (tty_hung_up_p(filp) ||
1280 !(info->flags & S_INITIALIZED)) {
1281 #ifdef SERIAL_DO_RESTART
1282 if (info->flags & S_HUP_NOTIFY)
1283 retval = -EAGAIN;
1284 else
1285 retval = -ERESTARTSYS;
1286 #else
1287 retval = -EAGAIN;
1288 #endif
1289 break;
1290 }
1291 if (!(info->flags & S_CLOSING) && do_clocal)
1292 break;
1293 if (signal_pending(current)) {
1294 retval = -ERESTARTSYS;
1295 break;
1296 }
1297 schedule();
1298 }
1299 current->state = TASK_RUNNING;
1300 remove_wait_queue(&info->open_wait, &wait);
1301 if (!tty_hung_up_p(filp))
1302 info->count++;
1303 info->blocked_open--;
1304
1305 if (retval)
1306 return retval;
1307 info->flags |= S_NORMAL_ACTIVE;
1308 return 0;
1309 }
1310
1311 /*
1312 * This routine is called whenever a serial port is opened. It
1313 * enables interrupts for a serial port, linking in its S structure into
1314 * the IRQ chain. It also performs the serial-specific
1315 * initialization for the tty structure.
1316 */
1317 int rs_open(struct tty_struct *tty, struct file * filp)
1318 {
1319 struct m68k_serial *info;
1320 int retval, line;
1321
1322 line = tty->index;
1323
1324 if (line >= NR_PORTS || line < 0) /* we have exactly one */
1325 return -ENODEV;
1326
1327 info = &m68k_soft[line];
1328
1329 if (serial_paranoia_check(info, tty->name, "rs_open"))
1330 return -ENODEV;
1331
1332 info->count++;
1333 tty->driver_data = info;
1334 info->tty = tty;
1335
1336 /*
1337 * Start up serial port
1338 */
1339 retval = startup(info);
1340 if (retval)
1341 return retval;
1342
1343 return block_til_ready(tty, filp, info);
1344 }
1345
1346 /* Finally, routines used to initialize the serial driver. */
1347
1348 static void show_serial_version(void)
1349 {
1350 printk("MC68328 serial driver version 1.00\n");
1351 }
1352
1353 #ifdef CONFIG_PM
1354 /* Serial Power management
1355 * The console (currently fixed at line 0) is a special case for power
1356 * management because the kernel is so chatty. The console will be
1357 * explicitly disabled my our power manager as the last minute, so we won't
1358 * mess with it here.
1359 */
1360 static struct pm_dev *serial_pm[NR_PORTS];
1361
1362 static int serial_pm_callback(struct pm_dev *dev, pm_request_t request, void *data)
1363 {
1364 struct m68k_serial *info = (struct m68k_serial *)dev->data;
1365
1366 if(info == NULL)
1367 return -1;
1368
1369 /* special case for line 0 - pm restores it */
1370 if(info->line == 0)
1371 return 0;
1372
1373 switch (request) {
1374 case PM_SUSPEND:
1375 shutdown(info);
1376 break;
1377
1378 case PM_RESUME:
1379 startup(info);
1380 break;
1381 }
1382 return 0;
1383 }
1384
1385 void shutdown_console(void)
1386 {
1387 struct m68k_serial *info = &m68k_soft[0];
1388
1389 /* HACK: wait a bit for any pending printk's to be dumped */
1390 {
1391 int i = 10000;
1392 while(i--);
1393 }
1394
1395 shutdown(info);
1396 }
1397
1398 void startup_console(void)
1399 {
1400 struct m68k_serial *info = &m68k_soft[0];
1401 startup(info);
1402 }
1403 #endif
1404
1405
1406 static struct tty_operations rs_ops = {
1407 .open = rs_open,
1408 .close = rs_close,
1409 .write = rs_write,
1410 .flush_chars = rs_flush_chars,
1411 .write_room = rs_write_room,
1412 .chars_in_buffer = rs_chars_in_buffer,
1413 .flush_buffer = rs_flush_buffer,
1414 .ioctl = rs_ioctl,
1415 .throttle = rs_throttle,
1416 .unthrottle = rs_unthrottle,
1417 .set_termios = rs_set_termios,
1418 .stop = rs_stop,
1419 .start = rs_start,
1420 .hangup = rs_hangup,
1421 .set_ldisc = rs_set_ldisc,
1422 };
1423
1424 /* rs_init inits the driver */
1425 static int __init
1426 rs68328_init(void)
1427 {
1428 int flags, i;
1429 struct m68k_serial *info;
1430
1431 serial_driver = alloc_tty_driver(NR_PORTS);
1432 if (!serial_driver)
1433 return -ENOMEM;
1434
1435 show_serial_version();
1436
1437 /* Initialize the tty_driver structure */
1438 /* SPARC: Not all of this is exactly right for us. */
1439
1440 serial_driver->name = "ttyS";
1441 serial_driver->major = TTY_MAJOR;
1442 serial_driver->minor_start = 64;
1443 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1444 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1445 serial_driver->init_termios = tty_std_termios;
1446 serial_driver->init_termios.c_cflag =
1447 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1448 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1449 tty_set_operations(serial_driver, &rs_ops);
1450
1451 if (tty_register_driver(serial_driver)) {
1452 put_tty_driver(serial_driver);
1453 printk(KERN_ERR "Couldn't register serial driver\n");
1454 return -ENOMEM;
1455 }
1456
1457 save_flags(flags); cli();
1458
1459 for(i=0;i<NR_PORTS;i++) {
1460
1461 info = &m68k_soft[i];
1462 info->magic = SERIAL_MAGIC;
1463 info->port = (int) &uart_addr[i];
1464 info->tty = 0;
1465 info->irq = uart_irqs[i];
1466 info->custom_divisor = 16;
1467 info->close_delay = 50;
1468 info->closing_wait = 3000;
1469 info->x_char = 0;
1470 info->event = 0;
1471 info->count = 0;
1472 info->blocked_open = 0;
1473 INIT_WORK(&info->tqueue, do_softint, info);
1474 INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
1475 init_waitqueue_head(&info->open_wait);
1476 init_waitqueue_head(&info->close_wait);
1477 info->line = i;
1478 info->is_cons = 1; /* Means shortcuts work */
1479
1480 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1481 info->port, info->irq);
1482 printk(" is a builtin MC68328 UART\n");
1483
1484 IRQ_ports[info->irq] = info; /* waste of space */
1485
1486 #ifdef CONFIG_M68VZ328
1487 if (i > 0 )
1488 PJSEL &= 0xCF; /* PSW enable second port output */
1489 #endif
1490
1491 if (request_irq(uart_irqs[i],
1492 rs_interrupt,
1493 IRQ_FLG_STD,
1494 "M68328_UART", NULL))
1495 panic("Unable to attach 68328 serial interrupt\n");
1496 #ifdef CONFIG_PM
1497 serial_pm[i] = pm_register(PM_SYS_DEV, PM_SYS_COM, serial_pm_callback);
1498 if (serial_pm[i])
1499 serial_pm[i]->data = info;
1500 #endif
1501 }
1502 restore_flags(flags);
1503 return 0;
1504 }
1505
1506
1507
1508 /*
1509 * register_serial and unregister_serial allows for serial ports to be
1510 * configured at run-time, to support PCMCIA modems.
1511 */
1512 /* SPARC: Unused at this time, just here to make things link. */
1513 int register_serial(struct serial_struct *req)
1514 {
1515 return -1;
1516 }
1517
1518 void unregister_serial(int line)
1519 {
1520 return;
1521 }
1522
1523 module_init(rs68328_init);
1524
1525
1526
1527 static void m68328_set_baud(void)
1528 {
1529 unsigned short ustcnt;
1530 int i;
1531
1532 ustcnt = USTCNT;
1533 USTCNT = ustcnt & ~USTCNT_TXEN;
1534
1535 again:
1536 for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++)
1537 if (baud_table[i] == m68328_console_baud)
1538 break;
1539 if (i >= sizeof(baud_table) / sizeof(baud_table[0])) {
1540 m68328_console_baud = 9600;
1541 goto again;
1542 }
1543
1544 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1545 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1546 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1547 ustcnt |= USTCNT_8_7;
1548 ustcnt |= USTCNT_TXEN;
1549 USTCNT = ustcnt;
1550 m68328_console_initted = 1;
1551 return;
1552 }
1553
1554
1555 int m68328_console_setup(struct console *cp, char *arg)
1556 {
1557 int i, n = CONSOLE_BAUD_RATE;
1558
1559 if (!cp)
1560 return(-1);
1561
1562 if (arg)
1563 n = simple_strtoul(arg,NULL,0);
1564
1565 for (i = 0; i < BAUD_TABLE_SIZE; i++)
1566 if (baud_table[i] == n)
1567 break;
1568 if (i < BAUD_TABLE_SIZE) {
1569 m68328_console_baud = n;
1570 m68328_console_cbaud = 0;
1571 if (i > 15) {
1572 m68328_console_cbaud |= CBAUDEX;
1573 i -= 15;
1574 }
1575 m68328_console_cbaud |= i;
1576 }
1577
1578 m68328_set_baud(); /* make sure baud rate changes */
1579 return(0);
1580 }
1581
1582
1583 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1584 {
1585 *index = c->index;
1586 return serial_driver;
1587 }
1588
1589
1590 void m68328_console_write (struct console *co, const char *str,
1591 unsigned int count)
1592 {
1593 if (!m68328_console_initted)
1594 m68328_set_baud();
1595 while (count--) {
1596 if (*str == '\n')
1597 rs_put_char('\r');
1598 rs_put_char( *str++ );
1599 }
1600 }
1601
1602
1603 static struct console m68328_driver = {
1604 .name = "ttyS",
1605 .write = m68328_console_write,
1606 .device = m68328_console_device,
1607 .setup = m68328_console_setup,
1608 .flags = CON_PRINTBUFFER,
1609 .index = -1,
1610 };
1611
1612
1613 static int __init m68328_console_init(void)
1614 {
1615 register_console(&m68328_driver);
1616 return 0;
1617 }
1618
1619 console_initcall(m68328_console_init);
1620
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