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