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[PATCH] 68328serial: sysrq should use emergency_reboot
[deliverable/linux.git] / drivers / serial / 68328serial.c
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1da177e4
LT		 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
70static struct m68k_serial m68k_soft[NR_PORTS];
71struct m68k_serial *IRQ_ports[NR_IRQS];
72
73static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
74
75/* multiple ports are contiguous in memory */
76m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
77
78struct tty_struct m68k_ttys;
79struct m68k_serial *m68k_consinfo = 0;
80
81#define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
82
83#ifdef CONFIG_CONSOLE
84extern wait_queue_head_t keypress_wait;
85#endif
86
87struct 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
106static 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
131static int m68328_console_initted = 0;
132static int m68328_console_baud = CONSOLE_BAUD_RATE;
133static 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 */
145static unsigned char tmp_buf[SERIAL_XMIT_SIZE]; /* This is cheating */
146DECLARE_MUTEX(tmp_buf_sem);
147
148static 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 */
172static 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 */
179static 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 */
190static 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 */
208static 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
222static 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
238static 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 */
261static void batten_down_hatches(void)
262{
263 /* Drop into the debugger */
264}
265
266static _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
293static _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 */
804ebf46 319 emergency_restart();
1da177e4
LT		 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
361clear_and_exit:
362 return;
363}
364
365static _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
396clear_and_return:
397 /* Clear interrupt (should be auto)*/
398 return;
399}
400
401/*
402 * This is the serial driver's generic interrupt routine
403 */
404irqreturn_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
429static 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 */
453static 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
466static 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 */
521static 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
544struct {
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 */
596static 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 */
652static 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 */
686void 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
702static 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
714static 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
759extern void console_printn(const char * b, int count);
760
761static 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
820static 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
833static 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
842static 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 */
862static 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
875static 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
898static 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
919static 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
959check_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 */
974static 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 */
6a72c7ba 995static void send_break(struct m68k_serial * info, unsigned int duration)
1da177e4
LT		 996{
997 m68328_uart *uart = &uart_addr[info->line];
998 unsigned long flags;
999 if (!info->port)
1000 return;
1da177e4
LT		 1001 save_flags(flags);
1002 cli();
1003#ifdef USE_INTS
1004 uart->utx.w |= UTX_SEND_BREAK;
6a72c7ba 1005 msleep_interruptible(duration);
1da177e4
LT		 1006 uart->utx.w &= ~UTX_SEND_BREAK;
1007#endif
1008 restore_flags(flags);
1009}
1010
1011static int rs_ioctl(struct tty_struct *tty, struct file * file,
1012 unsigned int cmd, unsigned long arg)
1013{
1014 int error;
1015 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1016 int retval;
1017
1018 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1019 return -ENODEV;
1020
1021 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1022 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1023 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1024 if (tty->flags & (1 << TTY_IO_ERROR))
1025 return -EIO;
1026 }
1027
1028 switch (cmd) {
1029 case TCSBRK: /* SVID version: non-zero arg --> no break */
1030 retval = tty_check_change(tty);
1031 if (retval)
1032 return retval;
1033 tty_wait_until_sent(tty, 0);
1034 if (!arg)
6a72c7ba 1035 send_break(info, 250); /* 1/4 second */
1da177e4
LT		 1036 return 0;
1037 case TCSBRKP: /* support for POSIX tcsendbreak() */
1038 retval = tty_check_change(tty);
1039 if (retval)
1040 return retval;
1041 tty_wait_until_sent(tty, 0);
6a72c7ba 1042 send_break(info, arg ? arg*(100) : 250);
1da177e4
LT		 1043 return 0;
1044 case TIOCGSOFTCAR:
1045 error = put_user(C_CLOCAL(tty) ? 1 : 0,
1046 (unsigned long *) arg);
1047 if (error)
1048 return error;
1049 return 0;
1050 case TIOCSSOFTCAR:
1051 get_user(arg, (unsigned long *) arg);
1052 tty->termios->c_cflag =
1053 ((tty->termios->c_cflag & ~CLOCAL) |
1054 (arg ? CLOCAL : 0));
1055 return 0;
1056 case TIOCGSERIAL:
1057 if (access_ok(VERIFY_WRITE, (void *) arg,
1058 sizeof(struct serial_struct)))
1059 return get_serial_info(info,
1060 (struct serial_struct *) arg);
1061 return -EFAULT;
1062 case TIOCSSERIAL:
1063 return set_serial_info(info,
1064 (struct serial_struct *) arg);
1065 case TIOCSERGETLSR: /* Get line status register */
1066 if (access_ok(VERIFY_WRITE, (void *) arg,
1067 sizeof(unsigned int));
1068 return get_lsr_info(info, (unsigned int *) arg);
1069 return -EFAULT;
1070 case TIOCSERGSTRUCT:
1071 if (!access_ok(VERIFY_WRITE, (void *) arg,
1072 sizeof(struct m68k_serial)))
1073 return -EFAULT;
1074 copy_to_user((struct m68k_serial *) arg,
1075 info, sizeof(struct m68k_serial));
1076 return 0;
1077
1078 default:
1079 return -ENOIOCTLCMD;
1080 }
1081 return 0;
1082}
1083
1084static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1085{
1086 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1087
1088 if (tty->termios->c_cflag == old_termios->c_cflag)
1089 return;
1090
1091 change_speed(info);
1092
1093 if ((old_termios->c_cflag & CRTSCTS) &&
1094 !(tty->termios->c_cflag & CRTSCTS)) {
1095 tty->hw_stopped = 0;
1096 rs_start(tty);
1097 }
1098
1099}
1100
1101/*
1102 * ------------------------------------------------------------
1103 * rs_close()
1104 *
1105 * This routine is called when the serial port gets closed. First, we
1106 * wait for the last remaining data to be sent. Then, we unlink its
1107 * S structure from the interrupt chain if necessary, and we free
1108 * that IRQ if nothing is left in the chain.
1109 * ------------------------------------------------------------
1110 */
1111static void rs_close(struct tty_struct *tty, struct file * filp)
1112{
1113 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1114 m68328_uart *uart = &uart_addr[info->line];
1115 unsigned long flags;
1116
1117 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1118 return;
1119
1120 save_flags(flags); cli();
1121
1122 if (tty_hung_up_p(filp)) {
1123 restore_flags(flags);
1124 return;
1125 }
1126
1127 if ((tty->count == 1) && (info->count != 1)) {
1128 /*
1129 * Uh, oh. tty->count is 1, which means that the tty
1130 * structure will be freed. Info->count should always
1131 * be one in these conditions. If it's greater than
1132 * one, we've got real problems, since it means the
1133 * serial port won't be shutdown.
1134 */
1135 printk("rs_close: bad serial port count; tty->count is 1, "
1136 "info->count is %d\n", info->count);
1137 info->count = 1;
1138 }
1139 if (--info->count < 0) {
1140 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1141 info->line, info->count);
1142 info->count = 0;
1143 }
1144 if (info->count) {
1145 restore_flags(flags);
1146 return;
1147 }
1148 info->flags |= S_CLOSING;
1149 /*
1150 * Now we wait for the transmit buffer to clear; and we notify
1151 * the line discipline to only process XON/XOFF characters.
1152 */
1153 tty->closing = 1;
1154 if (info->closing_wait != S_CLOSING_WAIT_NONE)
1155 tty_wait_until_sent(tty, info->closing_wait);
1156 /*
1157 * At this point we stop accepting input. To do this, we
1158 * disable the receive line status interrupts, and tell the
1159 * interrupt driver to stop checking the data ready bit in the
1160 * line status register.
1161 */
1162
1163 uart->ustcnt &= ~USTCNT_RXEN;
1164 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1165
1166 shutdown(info);
1167 if (tty->driver->flush_buffer)
1168 tty->driver->flush_buffer(tty);
1169
1170 tty_ldisc_flush(tty);
1171 tty->closing = 0;
1172 info->event = 0;
1173 info->tty = 0;
1174#warning "This is not and has never been valid so fix it"
1175#if 0
1176 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1177 if (tty->ldisc.close)
1178 (tty->ldisc.close)(tty);
1179 tty->ldisc = ldiscs[N_TTY];
1180 tty->termios->c_line = N_TTY;
1181 if (tty->ldisc.open)
1182 (tty->ldisc.open)(tty);
1183 }
1184#endif
1185 if (info->blocked_open) {
1186 if (info->close_delay) {
1187 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1188 }
1189 wake_up_interruptible(&info->open_wait);
1190 }
1191 info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1192 wake_up_interruptible(&info->close_wait);
1193 restore_flags(flags);
1194}
1195
1196/*
1197 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1198 */
1199void rs_hangup(struct tty_struct *tty)
1200{
1201 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1202
1203 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1204 return;
1205
1206 rs_flush_buffer(tty);
1207 shutdown(info);
1208 info->event = 0;
1209 info->count = 0;
1210 info->flags &= ~S_NORMAL_ACTIVE;
1211 info->tty = 0;
1212 wake_up_interruptible(&info->open_wait);
1213}
1214
1215/*
1216 * ------------------------------------------------------------
1217 * rs_open() and friends
1218 * ------------------------------------------------------------
1219 */
1220static int block_til_ready(struct tty_struct *tty, struct file * filp,
1221 struct m68k_serial *info)
1222{
1223 DECLARE_WAITQUEUE(wait, current);
1224 int retval;
1225 int do_clocal = 0;
1226
1227 /*
1228 * If the device is in the middle of being closed, then block
1229 * until it's done, and then try again.
1230 */
1231 if (info->flags & S_CLOSING) {
1232 interruptible_sleep_on(&info->close_wait);
1233#ifdef SERIAL_DO_RESTART
1234 if (info->flags & S_HUP_NOTIFY)
1235 return -EAGAIN;
1236 else
1237 return -ERESTARTSYS;
1238#else
1239 return -EAGAIN;
1240#endif
1241 }
1242
1243 /*
1244 * If non-blocking mode is set, or the port is not enabled,
1245 * then make the check up front and then exit.
1246 */
1247 if ((filp->f_flags & O_NONBLOCK) ||
1248 (tty->flags & (1 << TTY_IO_ERROR))) {
1249 info->flags |= S_NORMAL_ACTIVE;
1250 return 0;
1251 }
1252
1253 if (tty->termios->c_cflag & CLOCAL)
1254 do_clocal = 1;
1255
1256 /*
1257 * Block waiting for the carrier detect and the line to become
1258 * free (i.e., not in use by the callout). While we are in
1259 * this loop, info->count is dropped by one, so that
1260 * rs_close() knows when to free things. We restore it upon
1261 * exit, either normal or abnormal.
1262 */
1263 retval = 0;
1264 add_wait_queue(&info->open_wait, &wait);
1265
1266 info->count--;
1267 info->blocked_open++;
1268 while (1) {
1269 cli();
1270 m68k_rtsdtr(info, 1);
1271 sti();
1272 current->state = TASK_INTERRUPTIBLE;
1273 if (tty_hung_up_p(filp) ||
1274 !(info->flags & S_INITIALIZED)) {
1275#ifdef SERIAL_DO_RESTART
1276 if (info->flags & S_HUP_NOTIFY)
1277 retval = -EAGAIN;
1278 else
1279 retval = -ERESTARTSYS;
1280#else
1281 retval = -EAGAIN;
1282#endif
1283 break;
1284 }
1285 if (!(info->flags & S_CLOSING) && do_clocal)
1286 break;
1287 if (signal_pending(current)) {
1288 retval = -ERESTARTSYS;
1289 break;
1290 }
1291 schedule();
1292 }
1293 current->state = TASK_RUNNING;
1294 remove_wait_queue(&info->open_wait, &wait);
1295 if (!tty_hung_up_p(filp))
1296 info->count++;
1297 info->blocked_open--;
1298
1299 if (retval)
1300 return retval;
1301 info->flags |= S_NORMAL_ACTIVE;
1302 return 0;
1303}
1304
1305/*
1306 * This routine is called whenever a serial port is opened. It
1307 * enables interrupts for a serial port, linking in its S structure into
1308 * the IRQ chain. It also performs the serial-specific
1309 * initialization for the tty structure.
1310 */
1311int rs_open(struct tty_struct *tty, struct file * filp)
1312{
1313 struct m68k_serial *info;
1314 int retval, line;
1315
1316 line = tty->index;
1317
1318 if (line >= NR_PORTS || line < 0) /* we have exactly one */
1319 return -ENODEV;
1320
1321 info = &m68k_soft[line];
1322
1323 if (serial_paranoia_check(info, tty->name, "rs_open"))
1324 return -ENODEV;
1325
1326 info->count++;
1327 tty->driver_data = info;
1328 info->tty = tty;
1329
1330 /*
1331 * Start up serial port
1332 */
1333 retval = startup(info);
1334 if (retval)
1335 return retval;
1336
1337 return block_til_ready(tty, filp, info);
1338}
1339
1340/* Finally, routines used to initialize the serial driver. */
1341
1342static void show_serial_version(void)
1343{
1344 printk("MC68328 serial driver version 1.00\n");
1345}
1346
1347#ifdef CONFIG_PM
1348/* Serial Power management
1349 * The console (currently fixed at line 0) is a special case for power
1350 * management because the kernel is so chatty. The console will be
1351 * explicitly disabled my our power manager as the last minute, so we won't
1352 * mess with it here.
1353 */
1354static struct pm_dev *serial_pm[NR_PORTS];
1355
1356static int serial_pm_callback(struct pm_dev *dev, pm_request_t request, void *data)
1357{
1358 struct m68k_serial *info = (struct m68k_serial *)dev->data;
1359
1360 if(info == NULL)
1361 return -1;
1362
1363 /* special case for line 0 - pm restores it */
1364 if(info->line == 0)
1365 return 0;
1366
1367 switch (request) {
1368 case PM_SUSPEND:
1369 shutdown(info);
1370 break;
1371
1372 case PM_RESUME:
1373 startup(info);
1374 break;
1375 }
1376 return 0;
1377}
1378
1379void shutdown_console(void)
1380{
1381 struct m68k_serial *info = &m68k_soft[0];
1382
1383 /* HACK: wait a bit for any pending printk's to be dumped */
1384 {
1385 int i = 10000;
1386 while(i--);
1387 }
1388
1389 shutdown(info);
1390}
1391
1392void startup_console(void)
1393{
1394 struct m68k_serial *info = &m68k_soft[0];
1395 startup(info);
1396}
1397#endif
1398
1399
1400static struct tty_operations rs_ops = {
1401 .open = rs_open,
1402 .close = rs_close,
1403 .write = rs_write,
1404 .flush_chars = rs_flush_chars,
1405 .write_room = rs_write_room,
1406 .chars_in_buffer = rs_chars_in_buffer,
1407 .flush_buffer = rs_flush_buffer,
1408 .ioctl = rs_ioctl,
1409 .throttle = rs_throttle,
1410 .unthrottle = rs_unthrottle,
1411 .set_termios = rs_set_termios,
1412 .stop = rs_stop,
1413 .start = rs_start,
1414 .hangup = rs_hangup,
1415 .set_ldisc = rs_set_ldisc,
1416};
1417
1418/* rs_init inits the driver */
1419static int __init
1420rs68328_init(void)
1421{
1422 int flags, i;
1423 struct m68k_serial *info;
1424
1425 serial_driver = alloc_tty_driver(NR_PORTS);
1426 if (!serial_driver)
1427 return -ENOMEM;
1428
1429 show_serial_version();
1430
1431 /* Initialize the tty_driver structure */
1432 /* SPARC: Not all of this is exactly right for us. */
1433
1434 serial_driver->name = "ttyS";
1435 serial_driver->major = TTY_MAJOR;
1436 serial_driver->minor_start = 64;
1437 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1438 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1439 serial_driver->init_termios = tty_std_termios;
1440 serial_driver->init_termios.c_cflag =
1441 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1442 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1443 tty_set_operations(serial_driver, &rs_ops);
1444
1445 if (tty_register_driver(serial_driver)) {
1446 put_tty_driver(serial_driver);
1447 printk(KERN_ERR "Couldn't register serial driver\n");
1448 return -ENOMEM;
1449 }
1450
1451 save_flags(flags); cli();
1452
1453 for(i=0;i<NR_PORTS;i++) {
1454
1455 info = &m68k_soft[i];
1456 info->magic = SERIAL_MAGIC;
1457 info->port = (int) &uart_addr[i];
1458 info->tty = 0;
1459 info->irq = uart_irqs[i];
1460 info->custom_divisor = 16;
1461 info->close_delay = 50;
1462 info->closing_wait = 3000;
1463 info->x_char = 0;
1464 info->event = 0;
1465 info->count = 0;
1466 info->blocked_open = 0;
1467 INIT_WORK(&info->tqueue, do_softint, info);
1468 INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
1469 init_waitqueue_head(&info->open_wait);
1470 init_waitqueue_head(&info->close_wait);
1471 info->line = i;
1472 info->is_cons = 1; /* Means shortcuts work */
1473
1474 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1475 info->port, info->irq);
1476 printk(" is a builtin MC68328 UART\n");
1477
1478 IRQ_ports[info->irq] = info; /* waste of space */
1479
1480#ifdef CONFIG_M68VZ328
1481 if (i > 0 )
1482 PJSEL &= 0xCF; /* PSW enable second port output */
1483#endif
1484
1485 if (request_irq(uart_irqs[i],
1486 rs_interrupt,
1487 IRQ_FLG_STD,
1488 "M68328_UART", NULL))
1489 panic("Unable to attach 68328 serial interrupt\n");
1490#ifdef CONFIG_PM
1491 serial_pm[i] = pm_register(PM_SYS_DEV, PM_SYS_COM, serial_pm_callback);
1492 if (serial_pm[i])
1493 serial_pm[i]->data = info;
1494#endif
1495 }
1496 restore_flags(flags);
1497 return 0;
1498}
1499
1da177e4
LT		 1500module_init(rs68328_init);
1501
1502
1503
1504static void m68328_set_baud(void)
1505{
1506 unsigned short ustcnt;
1507 int i;
1508
1509 ustcnt = USTCNT;
1510 USTCNT = ustcnt & ~USTCNT_TXEN;
1511
1512again:
1513 for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++)
1514 if (baud_table[i] == m68328_console_baud)
1515 break;
1516 if (i >= sizeof(baud_table) / sizeof(baud_table[0])) {
1517 m68328_console_baud = 9600;
1518 goto again;
1519 }
1520
1521 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1522 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1523 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1524 ustcnt |= USTCNT_8_7;
1525 ustcnt |= USTCNT_TXEN;
1526 USTCNT = ustcnt;
1527 m68328_console_initted = 1;
1528 return;
1529}
1530
1531
1532int m68328_console_setup(struct console *cp, char *arg)
1533{
1534 int i, n = CONSOLE_BAUD_RATE;
1535
1536 if (!cp)
1537 return(-1);
1538
1539 if (arg)
1540 n = simple_strtoul(arg,NULL,0);
1541
1542 for (i = 0; i < BAUD_TABLE_SIZE; i++)
1543 if (baud_table[i] == n)
1544 break;
1545 if (i < BAUD_TABLE_SIZE) {
1546 m68328_console_baud = n;
1547 m68328_console_cbaud = 0;
1548 if (i > 15) {
1549 m68328_console_cbaud |= CBAUDEX;
1550 i -= 15;
1551 }
1552 m68328_console_cbaud |= i;
1553 }
1554
1555 m68328_set_baud(); /* make sure baud rate changes */
1556 return(0);
1557}
1558
1559
1560static struct tty_driver *m68328_console_device(struct console *c, int *index)
1561{
1562 *index = c->index;
1563 return serial_driver;
1564}
1565
1566
1567void m68328_console_write (struct console *co, const char *str,
1568 unsigned int count)
1569{
1570 if (!m68328_console_initted)
1571 m68328_set_baud();
1572 while (count--) {
1573 if (*str == '\n')
1574 rs_put_char('\r');
1575 rs_put_char( *str++ );
1576 }
1577}
1578
1579
1580static struct console m68328_driver = {
1581 .name = "ttyS",
1582 .write = m68328_console_write,
1583 .device = m68328_console_device,
1584 .setup = m68328_console_setup,
1585 .flags = CON_PRINTBUFFER,
1586 .index = -1,
1587};
1588
1589
1590static int __init m68328_console_init(void)
1591{
1592 register_console(&m68328_driver);
1593 return 0;
1594}
1595
1596console_initcall(m68328_console_init);
Linux kernel - Deliverables
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