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1/* 68328serial.c: Serial port driver for 68328 microcontroller
2 *
3 * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
4 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
5 * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
6 * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
7 * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com>
8 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
9 *
10 * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca>
11 * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au>
12 * Power management support Daniel Potts <danielp@cse.unsw.edu.au>
13 * VZ Second Serial Port enable Phil Wilshire
14 * 2.4/2.5 port David McCullough
15 */
16
17#include <asm/dbg.h>
18#include <linux/module.h>
19#include <linux/errno.h>
20#include <linux/signal.h>
21#include <linux/sched.h>
22#include <linux/timer.h>
23#include <linux/interrupt.h>
24#include <linux/tty.h>
25#include <linux/tty_flip.h>
26#include <linux/major.h>
27#include <linux/string.h>
28#include <linux/fcntl.h>
29#include <linux/mm.h>
30#include <linux/kernel.h>
31#include <linux/console.h>
32#include <linux/reboot.h>
33#include <linux/keyboard.h>
34#include <linux/init.h>
35#include <linux/pm.h>
36#include <linux/bitops.h>
37#include <linux/delay.h>
38#include <linux/gfp.h>
39
40#include <asm/io.h>
41#include <asm/irq.h>
42#include <asm/system.h>
43#include <asm/delay.h>
44#include <asm/uaccess.h>
45
46/* (es) */
47/* note: perhaps we can murge these files, so that you can just
48 * define 1 of them, and they can sort that out for themselves
49 */
50#if defined(CONFIG_M68EZ328)
51#include <asm/MC68EZ328.h>
52#else
53#if defined(CONFIG_M68VZ328)
54#include <asm/MC68VZ328.h>
55#else
56#include <asm/MC68328.h>
57#endif /* CONFIG_M68VZ328 */
58#endif /* CONFIG_M68EZ328 */
59
60#include "68328serial.h"
61
62/* Turn off usage of real serial interrupt code, to "support" Copilot */
63#ifdef CONFIG_XCOPILOT_BUGS
64#undef USE_INTS
65#else
66#define USE_INTS
67#endif
68
69static struct m68k_serial m68k_soft[NR_PORTS];
70
71static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
72
73/* multiple ports are contiguous in memory */
74m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
75
76struct tty_struct m68k_ttys;
77struct m68k_serial *m68k_consinfo = 0;
78
79#define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
80
81struct tty_driver *serial_driver;
82
83/* number of characters left in xmit buffer before we ask for more */
84#define WAKEUP_CHARS 256
85
86/* Debugging... DEBUG_INTR is bad to use when one of the zs
87 * lines is your console ;(
88 */
89#undef SERIAL_DEBUG_INTR
90#undef SERIAL_DEBUG_OPEN
91#undef SERIAL_DEBUG_FLOW
92
93#define RS_ISR_PASS_LIMIT 256
94
95static void change_speed(struct m68k_serial *info);
96
97/*
98 * Setup for console. Argument comes from the boot command line.
99 */
100
101/* note: this is messy, but it works, again, perhaps defined somewhere else?*/
102#ifdef CONFIG_M68VZ328
103#define CONSOLE_BAUD_RATE 19200
104#define DEFAULT_CBAUD B19200
105#endif
106
107
108#ifndef CONSOLE_BAUD_RATE
109#define CONSOLE_BAUD_RATE 9600
110#define DEFAULT_CBAUD B9600
111#endif
112
113
114static int m68328_console_initted = 0;
115static int m68328_console_baud = CONSOLE_BAUD_RATE;
116static int m68328_console_cbaud = DEFAULT_CBAUD;
117
118
119static inline int serial_paranoia_check(struct m68k_serial *info,
120 char *name, const char *routine)
121{
122#ifdef SERIAL_PARANOIA_CHECK
123 static const char *badmagic =
124 "Warning: bad magic number for serial struct %s in %s\n";
125 static const char *badinfo =
126 "Warning: null m68k_serial for %s in %s\n";
127
128 if (!info) {
129 printk(badinfo, name, routine);
130 return 1;
131 }
132 if (info->magic != SERIAL_MAGIC) {
133 printk(badmagic, name, routine);
134 return 1;
135 }
136#endif
137 return 0;
138}
139
140/*
141 * This is used to figure out the divisor speeds and the timeouts
142 */
143static int baud_table[] = {
144 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
145 9600, 19200, 38400, 57600, 115200, 0 };
146
147/* Sets or clears DTR/RTS on the requested line */
148static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
149{
150 if (set) {
151 /* set the RTS/CTS line */
152 } else {
153 /* clear it */
154 }
155 return;
156}
157
158/* Utility routines */
159static inline int get_baud(struct m68k_serial *ss)
160{
161 unsigned long result = 115200;
162 unsigned short int baud = uart_addr[ss->line].ubaud;
163 if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
164 result >>= GET_FIELD(baud, UBAUD_DIVIDE);
165
166 return result;
167}
168
169/*
170 * ------------------------------------------------------------
171 * rs_stop() and rs_start()
172 *
173 * This routines are called before setting or resetting tty->stopped.
174 * They enable or disable transmitter interrupts, as necessary.
175 * ------------------------------------------------------------
176 */
177static void rs_stop(struct tty_struct *tty)
178{
179 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
180 m68328_uart *uart = &uart_addr[info->line];
181 unsigned long flags;
182
183 if (serial_paranoia_check(info, tty->name, "rs_stop"))
184 return;
185
186 local_irq_save(flags);
187 uart->ustcnt &= ~USTCNT_TXEN;
188 local_irq_restore(flags);
189}
190
191static int rs_put_char(char ch)
192{
193 int flags, loops = 0;
194
195 local_irq_save(flags);
196
197 while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
198 loops++;
199 udelay(5);
200 }
201
202 UTX_TXDATA = ch;
203 udelay(5);
204 local_irq_restore(flags);
205 return 1;
206}
207
208static void rs_start(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_start"))
215 return;
216
217 local_irq_save(flags);
218 if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
219#ifdef USE_INTS
220 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
221#else
222 uart->ustcnt |= USTCNT_TXEN;
223#endif
224 }
225 local_irq_restore(flags);
226}
227
228/* Drop into either the boot monitor or kadb upon receiving a break
229 * from keyboard/console input.
230 */
231static void batten_down_hatches(void)
232{
233 /* Drop into the debugger */
234}
235
236static void status_handle(struct m68k_serial *info, unsigned short status)
237{
238#if 0
239 if(status & DCD) {
240 if((info->port.tty->termios->c_cflag & CRTSCTS) &&
241 ((info->curregs[3] & AUTO_ENAB)==0)) {
242 info->curregs[3] |= AUTO_ENAB;
243 info->pendregs[3] |= AUTO_ENAB;
244 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
245 }
246 } else {
247 if((info->curregs[3] & AUTO_ENAB)) {
248 info->curregs[3] &= ~AUTO_ENAB;
249 info->pendregs[3] &= ~AUTO_ENAB;
250 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
251 }
252 }
253#endif
254 /* If this is console input and this is a
255 * 'break asserted' status change interrupt
256 * see if we can drop into the debugger
257 */
258 if((status & URX_BREAK) && info->break_abort)
259 batten_down_hatches();
260 return;
261}
262
263static void receive_chars(struct m68k_serial *info, unsigned short rx)
264{
265 struct tty_struct *tty = info->tty;
266 m68328_uart *uart = &uart_addr[info->line];
267 unsigned char ch, flag;
268
269 /*
270 * This do { } while() loop will get ALL chars out of Rx FIFO
271 */
272#ifndef CONFIG_XCOPILOT_BUGS
273 do {
274#endif
275 ch = GET_FIELD(rx, URX_RXDATA);
276
277 if(info->is_cons) {
278 if(URX_BREAK & rx) { /* whee, break received */
279 status_handle(info, rx);
280 return;
281#ifdef CONFIG_MAGIC_SYSRQ
282 } else if (ch == 0x10) { /* ^P */
283 show_state();
284 show_free_areas(0);
285 show_buffers();
286/* show_net_buffers(); */
287 return;
288 } else if (ch == 0x12) { /* ^R */
289 emergency_restart();
290 return;
291#endif /* CONFIG_MAGIC_SYSRQ */
292 }
293 }
294
295 if(!tty)
296 goto clear_and_exit;
297
298 flag = TTY_NORMAL;
299
300 if(rx & URX_PARITY_ERROR) {
301 flag = TTY_PARITY;
302 status_handle(info, rx);
303 } else if(rx & URX_OVRUN) {
304 flag = TTY_OVERRUN;
305 status_handle(info, rx);
306 } else if(rx & URX_FRAME_ERROR) {
307 flag = TTY_FRAME;
308 status_handle(info, rx);
309 }
310 tty_insert_flip_char(tty, ch, flag);
311#ifndef CONFIG_XCOPILOT_BUGS
312 } while((rx = uart->urx.w) & URX_DATA_READY);
313#endif
314
315 tty_schedule_flip(tty);
316
317clear_and_exit:
318 return;
319}
320
321static void transmit_chars(struct m68k_serial *info)
322{
323 m68328_uart *uart = &uart_addr[info->line];
324
325 if (info->x_char) {
326 /* Send next char */
327 uart->utx.b.txdata = info->x_char;
328 info->x_char = 0;
329 goto clear_and_return;
330 }
331
332 if((info->xmit_cnt <= 0) || info->tty->stopped) {
333 /* That's peculiar... TX ints off */
334 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
335 goto clear_and_return;
336 }
337
338 /* Send char */
339 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
340 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
341 info->xmit_cnt--;
342
343 if (info->xmit_cnt < WAKEUP_CHARS)
344 schedule_work(&info->tqueue);
345
346 if(info->xmit_cnt <= 0) {
347 /* All done for now... TX ints off */
348 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
349 goto clear_and_return;
350 }
351
352clear_and_return:
353 /* Clear interrupt (should be auto)*/
354 return;
355}
356
357/*
358 * This is the serial driver's generic interrupt routine
359 */
360irqreturn_t rs_interrupt(int irq, void *dev_id)
361{
362 struct m68k_serial *info = dev_id;
363 m68328_uart *uart;
364 unsigned short rx;
365 unsigned short tx;
366
367 uart = &uart_addr[info->line];
368 rx = uart->urx.w;
369
370#ifdef USE_INTS
371 tx = uart->utx.w;
372
373 if (rx & URX_DATA_READY) receive_chars(info, rx);
374 if (tx & UTX_TX_AVAIL) transmit_chars(info);
375#else
376 receive_chars(info, rx);
377#endif
378 return IRQ_HANDLED;
379}
380
381static void do_softint(struct work_struct *work)
382{
383 struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue);
384 struct tty_struct *tty;
385
386 tty = info->tty;
387 if (!tty)
388 return;
389#if 0
390 if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
391 tty_wakeup(tty);
392 }
393#endif
394}
395
396static int startup(struct m68k_serial * info)
397{
398 m68328_uart *uart = &uart_addr[info->line];
399 unsigned long flags;
400
401 if (info->flags & S_INITIALIZED)
402 return 0;
403
404 if (!info->xmit_buf) {
405 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
406 if (!info->xmit_buf)
407 return -ENOMEM;
408 }
409
410 local_irq_save(flags);
411
412 /*
413 * Clear the FIFO buffers and disable them
414 * (they will be reenabled in change_speed())
415 */
416
417 uart->ustcnt = USTCNT_UEN;
418 info->xmit_fifo_size = 1;
419 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
420 (void)uart->urx.w;
421
422 /*
423 * Finally, enable sequencing and interrupts
424 */
425#ifdef USE_INTS
426 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
427 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
428#else
429 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
430#endif
431
432 if (info->tty)
433 clear_bit(TTY_IO_ERROR, &info->tty->flags);
434 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
435
436 /*
437 * and set the speed of the serial port
438 */
439
440 change_speed(info);
441
442 info->flags |= S_INITIALIZED;
443 local_irq_restore(flags);
444 return 0;
445}
446
447/*
448 * This routine will shutdown a serial port; interrupts are disabled, and
449 * DTR is dropped if the hangup on close termio flag is on.
450 */
451static void shutdown(struct m68k_serial * info)
452{
453 m68328_uart *uart = &uart_addr[info->line];
454 unsigned long flags;
455
456 uart->ustcnt = 0; /* All off! */
457 if (!(info->flags & S_INITIALIZED))
458 return;
459
460 local_irq_save(flags);
461
462 if (info->xmit_buf) {
463 free_page((unsigned long) info->xmit_buf);
464 info->xmit_buf = 0;
465 }
466
467 if (info->tty)
468 set_bit(TTY_IO_ERROR, &info->tty->flags);
469
470 info->flags &= ~S_INITIALIZED;
471 local_irq_restore(flags);
472}
473
474struct {
475 int divisor, prescale;
476}
477#ifndef CONFIG_M68VZ328
478 hw_baud_table[18] = {
479 {0,0}, /* 0 */
480 {0,0}, /* 50 */
481 {0,0}, /* 75 */
482 {0,0}, /* 110 */
483 {0,0}, /* 134 */
484 {0,0}, /* 150 */
485 {0,0}, /* 200 */
486 {7,0x26}, /* 300 */
487 {6,0x26}, /* 600 */
488 {5,0x26}, /* 1200 */
489 {0,0}, /* 1800 */
490 {4,0x26}, /* 2400 */
491 {3,0x26}, /* 4800 */
492 {2,0x26}, /* 9600 */
493 {1,0x26}, /* 19200 */
494 {0,0x26}, /* 38400 */
495 {1,0x38}, /* 57600 */
496 {0,0x38}, /* 115200 */
497};
498#else
499 hw_baud_table[18] = {
500 {0,0}, /* 0 */
501 {0,0}, /* 50 */
502 {0,0}, /* 75 */
503 {0,0}, /* 110 */
504 {0,0}, /* 134 */
505 {0,0}, /* 150 */
506 {0,0}, /* 200 */
507 {0,0}, /* 300 */
508 {7,0x26}, /* 600 */
509 {6,0x26}, /* 1200 */
510 {0,0}, /* 1800 */
511 {5,0x26}, /* 2400 */
512 {4,0x26}, /* 4800 */
513 {3,0x26}, /* 9600 */
514 {2,0x26}, /* 19200 */
515 {1,0x26}, /* 38400 */
516 {0,0x26}, /* 57600 */
517 {1,0x38}, /* 115200 */
518};
519#endif
520/* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
521
522/*
523 * This routine is called to set the UART divisor registers to match
524 * the specified baud rate for a serial port.
525 */
526static void change_speed(struct m68k_serial *info)
527{
528 m68328_uart *uart = &uart_addr[info->line];
529 unsigned short port;
530 unsigned short ustcnt;
531 unsigned cflag;
532 int i;
533
534 if (!info->tty || !info->tty->termios)
535 return;
536 cflag = info->tty->termios->c_cflag;
537 if (!(port = info->port))
538 return;
539
540 ustcnt = uart->ustcnt;
541 uart->ustcnt = ustcnt & ~USTCNT_TXEN;
542
543 i = cflag & CBAUD;
544 if (i & CBAUDEX) {
545 i = (i & ~CBAUDEX) + B38400;
546 }
547
548 info->baud = baud_table[i];
549 uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
550 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
551
552 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
553
554 if ((cflag & CSIZE) == CS8)
555 ustcnt |= USTCNT_8_7;
556
557 if (cflag & CSTOPB)
558 ustcnt |= USTCNT_STOP;
559
560 if (cflag & PARENB)
561 ustcnt |= USTCNT_PARITYEN;
562 if (cflag & PARODD)
563 ustcnt |= USTCNT_ODD_EVEN;
564
565#ifdef CONFIG_SERIAL_68328_RTS_CTS
566 if (cflag & CRTSCTS) {
567 uart->utx.w &= ~ UTX_NOCTS;
568 } else {
569 uart->utx.w |= UTX_NOCTS;
570 }
571#endif
572
573 ustcnt |= USTCNT_TXEN;
574
575 uart->ustcnt = ustcnt;
576 return;
577}
578
579/*
580 * Fair output driver allows a process to speak.
581 */
582static void rs_fair_output(void)
583{
584 int left; /* Output no more than that */
585 unsigned long flags;
586 struct m68k_serial *info = &m68k_soft[0];
587 char c;
588
589 if (info == 0) return;
590 if (info->xmit_buf == 0) return;
591
592 local_irq_save(flags);
593 left = info->xmit_cnt;
594 while (left != 0) {
595 c = info->xmit_buf[info->xmit_tail];
596 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
597 info->xmit_cnt--;
598 local_irq_restore(flags);
599
600 rs_put_char(c);
601
602 local_irq_save(flags);
603 left = min(info->xmit_cnt, left-1);
604 }
605
606 /* Last character is being transmitted now (hopefully). */
607 udelay(5);
608
609 local_irq_restore(flags);
610 return;
611}
612
613/*
614 * m68k_console_print is registered for printk.
615 */
616void console_print_68328(const char *p)
617{
618 char c;
619
620 while((c=*(p++)) != 0) {
621 if(c == '\n')
622 rs_put_char('\r');
623 rs_put_char(c);
624 }
625
626 /* Comment this if you want to have a strict interrupt-driven output */
627 rs_fair_output();
628
629 return;
630}
631
632static void rs_set_ldisc(struct tty_struct *tty)
633{
634 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
635
636 if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
637 return;
638
639 info->is_cons = (tty->termios->c_line == N_TTY);
640
641 printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
642}
643
644static void rs_flush_chars(struct tty_struct *tty)
645{
646 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
647 m68328_uart *uart = &uart_addr[info->line];
648 unsigned long flags;
649
650 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
651 return;
652#ifndef USE_INTS
653 for(;;) {
654#endif
655
656 /* Enable transmitter */
657 local_irq_save(flags);
658
659 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
660 !info->xmit_buf) {
661 local_irq_restore(flags);
662 return;
663 }
664
665#ifdef USE_INTS
666 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
667#else
668 uart->ustcnt |= USTCNT_TXEN;
669#endif
670
671#ifdef USE_INTS
672 if (uart->utx.w & UTX_TX_AVAIL) {
673#else
674 if (1) {
675#endif
676 /* Send char */
677 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
678 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
679 info->xmit_cnt--;
680 }
681
682#ifndef USE_INTS
683 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
684 }
685#endif
686 local_irq_restore(flags);
687}
688
689extern void console_printn(const char * b, int count);
690
691static int rs_write(struct tty_struct * tty,
692 const unsigned char *buf, int count)
693{
694 int c, total = 0;
695 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
696 m68328_uart *uart = &uart_addr[info->line];
697 unsigned long flags;
698
699 if (serial_paranoia_check(info, tty->name, "rs_write"))
700 return 0;
701
702 if (!tty || !info->xmit_buf)
703 return 0;
704
705 local_save_flags(flags);
706 while (1) {
707 local_irq_disable();
708 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
709 SERIAL_XMIT_SIZE - info->xmit_head));
710 local_irq_restore(flags);
711
712 if (c <= 0)
713 break;
714
715 memcpy(info->xmit_buf + info->xmit_head, buf, c);
716
717 local_irq_disable();
718 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
719 info->xmit_cnt += c;
720 local_irq_restore(flags);
721 buf += c;
722 count -= c;
723 total += c;
724 }
725
726 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
727 /* Enable transmitter */
728 local_irq_disable();
729#ifndef USE_INTS
730 while(info->xmit_cnt) {
731#endif
732
733 uart->ustcnt |= USTCNT_TXEN;
734#ifdef USE_INTS
735 uart->ustcnt |= USTCNT_TX_INTR_MASK;
736#else
737 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
738#endif
739 if (uart->utx.w & UTX_TX_AVAIL) {
740 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
741 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
742 info->xmit_cnt--;
743 }
744
745#ifndef USE_INTS
746 }
747#endif
748 local_irq_restore(flags);
749 }
750
751 return total;
752}
753
754static int rs_write_room(struct tty_struct *tty)
755{
756 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
757 int ret;
758
759 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
760 return 0;
761 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
762 if (ret < 0)
763 ret = 0;
764 return ret;
765}
766
767static int rs_chars_in_buffer(struct tty_struct *tty)
768{
769 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
770
771 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
772 return 0;
773 return info->xmit_cnt;
774}
775
776static void rs_flush_buffer(struct tty_struct *tty)
777{
778 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
779 unsigned long flags;
780
781 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
782 return;
783 local_irq_save(flags);
784 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
785 local_irq_restore(flags);
786 tty_wakeup(tty);
787}
788
789/*
790 * ------------------------------------------------------------
791 * rs_throttle()
792 *
793 * This routine is called by the upper-layer tty layer to signal that
794 * incoming characters should be throttled.
795 * ------------------------------------------------------------
796 */
797static void rs_throttle(struct tty_struct * tty)
798{
799 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
800
801 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
802 return;
803
804 if (I_IXOFF(tty))
805 info->x_char = STOP_CHAR(tty);
806
807 /* Turn off RTS line (do this atomic) */
808}
809
810static void rs_unthrottle(struct tty_struct * tty)
811{
812 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
813
814 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
815 return;
816
817 if (I_IXOFF(tty)) {
818 if (info->x_char)
819 info->x_char = 0;
820 else
821 info->x_char = START_CHAR(tty);
822 }
823
824 /* Assert RTS line (do this atomic) */
825}
826
827/*
828 * ------------------------------------------------------------
829 * rs_ioctl() and friends
830 * ------------------------------------------------------------
831 */
832
833static int get_serial_info(struct m68k_serial * info,
834 struct serial_struct * retinfo)
835{
836 struct serial_struct tmp;
837
838 if (!retinfo)
839 return -EFAULT;
840 memset(&tmp, 0, sizeof(tmp));
841 tmp.type = info->type;
842 tmp.line = info->line;
843 tmp.port = info->port;
844 tmp.irq = info->irq;
845 tmp.flags = info->flags;
846 tmp.baud_base = info->baud_base;
847 tmp.close_delay = info->close_delay;
848 tmp.closing_wait = info->closing_wait;
849 tmp.custom_divisor = info->custom_divisor;
850 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
851 return -EFAULT;
852
853 return 0;
854}
855
856static int set_serial_info(struct m68k_serial * info,
857 struct serial_struct * new_info)
858{
859 struct serial_struct new_serial;
860 struct m68k_serial old_info;
861 int retval = 0;
862
863 if (!new_info)
864 return -EFAULT;
865 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
866 return -EFAULT;
867 old_info = *info;
868
869 if (!capable(CAP_SYS_ADMIN)) {
870 if ((new_serial.baud_base != info->baud_base) ||
871 (new_serial.type != info->type) ||
872 (new_serial.close_delay != info->close_delay) ||
873 ((new_serial.flags & ~S_USR_MASK) !=
874 (info->flags & ~S_USR_MASK)))
875 return -EPERM;
876 info->flags = ((info->flags & ~S_USR_MASK) |
877 (new_serial.flags & S_USR_MASK));
878 info->custom_divisor = new_serial.custom_divisor;
879 goto check_and_exit;
880 }
881
882 if (info->count > 1)
883 return -EBUSY;
884
885 /*
886 * OK, past this point, all the error checking has been done.
887 * At this point, we start making changes.....
888 */
889
890 info->baud_base = new_serial.baud_base;
891 info->flags = ((info->flags & ~S_FLAGS) |
892 (new_serial.flags & S_FLAGS));
893 info->type = new_serial.type;
894 info->close_delay = new_serial.close_delay;
895 info->closing_wait = new_serial.closing_wait;
896
897check_and_exit:
898 retval = startup(info);
899 return retval;
900}
901
902/*
903 * get_lsr_info - get line status register info
904 *
905 * Purpose: Let user call ioctl() to get info when the UART physically
906 * is emptied. On bus types like RS485, the transmitter must
907 * release the bus after transmitting. This must be done when
908 * the transmit shift register is empty, not be done when the
909 * transmit holding register is empty. This functionality
910 * allows an RS485 driver to be written in user space.
911 */
912static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
913{
914#ifdef CONFIG_SERIAL_68328_RTS_CTS
915 m68328_uart *uart = &uart_addr[info->line];
916#endif
917 unsigned char status;
918 unsigned long flags;
919
920 local_irq_save(flags);
921#ifdef CONFIG_SERIAL_68328_RTS_CTS
922 status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
923#else
924 status = 0;
925#endif
926 local_irq_restore(flags);
927 return put_user(status, value);
928}
929
930/*
931 * This routine sends a break character out the serial port.
932 */
933static void send_break(struct m68k_serial * info, unsigned int duration)
934{
935 m68328_uart *uart = &uart_addr[info->line];
936 unsigned long flags;
937 if (!info->port)
938 return;
939 local_irq_save(flags);
940#ifdef USE_INTS
941 uart->utx.w |= UTX_SEND_BREAK;
942 msleep_interruptible(duration);
943 uart->utx.w &= ~UTX_SEND_BREAK;
944#endif
945 local_irq_restore(flags);
946}
947
948static int rs_ioctl(struct tty_struct *tty,
949 unsigned int cmd, unsigned long arg)
950{
951 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
952 int retval;
953
954 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
955 return -ENODEV;
956
957 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
958 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
959 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
960 if (tty->flags & (1 << TTY_IO_ERROR))
961 return -EIO;
962 }
963
964 switch (cmd) {
965 case TCSBRK: /* SVID version: non-zero arg --> no break */
966 retval = tty_check_change(tty);
967 if (retval)
968 return retval;
969 tty_wait_until_sent(tty, 0);
970 if (!arg)
971 send_break(info, 250); /* 1/4 second */
972 return 0;
973 case TCSBRKP: /* support for POSIX tcsendbreak() */
974 retval = tty_check_change(tty);
975 if (retval)
976 return retval;
977 tty_wait_until_sent(tty, 0);
978 send_break(info, arg ? arg*(100) : 250);
979 return 0;
980 case TIOCGSERIAL:
981 return get_serial_info(info,
982 (struct serial_struct *) arg);
983 case TIOCSSERIAL:
984 return set_serial_info(info,
985 (struct serial_struct *) arg);
986 case TIOCSERGETLSR: /* Get line status register */
987 return get_lsr_info(info, (unsigned int *) arg);
988 case TIOCSERGSTRUCT:
989 if (copy_to_user((struct m68k_serial *) arg,
990 info, sizeof(struct m68k_serial)))
991 return -EFAULT;
992 return 0;
993 default:
994 return -ENOIOCTLCMD;
995 }
996 return 0;
997}
998
999static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1000{
1001 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1002
1003 change_speed(info);
1004
1005 if ((old_termios->c_cflag & CRTSCTS) &&
1006 !(tty->termios->c_cflag & CRTSCTS)) {
1007 tty->hw_stopped = 0;
1008 rs_start(tty);
1009 }
1010
1011}
1012
1013/*
1014 * ------------------------------------------------------------
1015 * rs_close()
1016 *
1017 * This routine is called when the serial port gets closed. First, we
1018 * wait for the last remaining data to be sent. Then, we unlink its
1019 * S structure from the interrupt chain if necessary, and we free
1020 * that IRQ if nothing is left in the chain.
1021 * ------------------------------------------------------------
1022 */
1023static void rs_close(struct tty_struct *tty, struct file * filp)
1024{
1025 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1026 m68328_uart *uart = &uart_addr[info->line];
1027 unsigned long flags;
1028
1029 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1030 return;
1031
1032 local_irq_save(flags);
1033
1034 if (tty_hung_up_p(filp)) {
1035 local_irq_restore(flags);
1036 return;
1037 }
1038
1039 if ((tty->count == 1) && (info->count != 1)) {
1040 /*
1041 * Uh, oh. tty->count is 1, which means that the tty
1042 * structure will be freed. Info->count should always
1043 * be one in these conditions. If it's greater than
1044 * one, we've got real problems, since it means the
1045 * serial port won't be shutdown.
1046 */
1047 printk("rs_close: bad serial port count; tty->count is 1, "
1048 "info->count is %d\n", info->count);
1049 info->count = 1;
1050 }
1051 if (--info->count < 0) {
1052 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1053 info->line, info->count);
1054 info->count = 0;
1055 }
1056 if (info->count) {
1057 local_irq_restore(flags);
1058 return;
1059 }
1060 info->flags |= S_CLOSING;
1061 /*
1062 * Now we wait for the transmit buffer to clear; and we notify
1063 * the line discipline to only process XON/XOFF characters.
1064 */
1065 tty->closing = 1;
1066 if (info->closing_wait != S_CLOSING_WAIT_NONE)
1067 tty_wait_until_sent(tty, info->closing_wait);
1068 /*
1069 * At this point we stop accepting input. To do this, we
1070 * disable the receive line status interrupts, and tell the
1071 * interrupt driver to stop checking the data ready bit in the
1072 * line status register.
1073 */
1074
1075 uart->ustcnt &= ~USTCNT_RXEN;
1076 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1077
1078 shutdown(info);
1079 rs_flush_buffer(tty);
1080
1081 tty_ldisc_flush(tty);
1082 tty->closing = 0;
1083 info->event = 0;
1084 info->tty = NULL;
1085#warning "This is not and has never been valid so fix it"
1086#if 0
1087 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1088 if (tty->ldisc.close)
1089 (tty->ldisc.close)(tty);
1090 tty->ldisc = ldiscs[N_TTY];
1091 tty->termios->c_line = N_TTY;
1092 if (tty->ldisc.open)
1093 (tty->ldisc.open)(tty);
1094 }
1095#endif
1096 if (info->blocked_open) {
1097 if (info->close_delay) {
1098 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1099 }
1100 wake_up_interruptible(&info->open_wait);
1101 }
1102 info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1103 wake_up_interruptible(&info->close_wait);
1104 local_irq_restore(flags);
1105}
1106
1107/*
1108 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1109 */
1110void rs_hangup(struct tty_struct *tty)
1111{
1112 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1113
1114 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1115 return;
1116
1117 rs_flush_buffer(tty);
1118 shutdown(info);
1119 info->event = 0;
1120 info->count = 0;
1121 info->flags &= ~S_NORMAL_ACTIVE;
1122 info->tty = NULL;
1123 wake_up_interruptible(&info->open_wait);
1124}
1125
1126/*
1127 * ------------------------------------------------------------
1128 * rs_open() and friends
1129 * ------------------------------------------------------------
1130 */
1131static int block_til_ready(struct tty_struct *tty, struct file * filp,
1132 struct m68k_serial *info)
1133{
1134 DECLARE_WAITQUEUE(wait, current);
1135 int retval;
1136 int do_clocal = 0;
1137
1138 /*
1139 * If the device is in the middle of being closed, then block
1140 * until it's done, and then try again.
1141 */
1142 if (info->flags & S_CLOSING) {
1143 interruptible_sleep_on(&info->close_wait);
1144#ifdef SERIAL_DO_RESTART
1145 if (info->flags & S_HUP_NOTIFY)
1146 return -EAGAIN;
1147 else
1148 return -ERESTARTSYS;
1149#else
1150 return -EAGAIN;
1151#endif
1152 }
1153
1154 /*
1155 * If non-blocking mode is set, or the port is not enabled,
1156 * then make the check up front and then exit.
1157 */
1158 if ((filp->f_flags & O_NONBLOCK) ||
1159 (tty->flags & (1 << TTY_IO_ERROR))) {
1160 info->flags |= S_NORMAL_ACTIVE;
1161 return 0;
1162 }
1163
1164 if (tty->termios->c_cflag & CLOCAL)
1165 do_clocal = 1;
1166
1167 /*
1168 * Block waiting for the carrier detect and the line to become
1169 * free (i.e., not in use by the callout). While we are in
1170 * this loop, info->count is dropped by one, so that
1171 * rs_close() knows when to free things. We restore it upon
1172 * exit, either normal or abnormal.
1173 */
1174 retval = 0;
1175 add_wait_queue(&info->open_wait, &wait);
1176
1177 info->count--;
1178 info->blocked_open++;
1179 while (1) {
1180 local_irq_disable();
1181 m68k_rtsdtr(info, 1);
1182 local_irq_enable();
1183 current->state = TASK_INTERRUPTIBLE;
1184 if (tty_hung_up_p(filp) ||
1185 !(info->flags & S_INITIALIZED)) {
1186#ifdef SERIAL_DO_RESTART
1187 if (info->flags & S_HUP_NOTIFY)
1188 retval = -EAGAIN;
1189 else
1190 retval = -ERESTARTSYS;
1191#else
1192 retval = -EAGAIN;
1193#endif
1194 break;
1195 }
1196 if (!(info->flags & S_CLOSING) && do_clocal)
1197 break;
1198 if (signal_pending(current)) {
1199 retval = -ERESTARTSYS;
1200 break;
1201 }
1202 tty_unlock();
1203 schedule();
1204 tty_lock();
1205 }
1206 current->state = TASK_RUNNING;
1207 remove_wait_queue(&info->open_wait, &wait);
1208 if (!tty_hung_up_p(filp))
1209 info->count++;
1210 info->blocked_open--;
1211
1212 if (retval)
1213 return retval;
1214 info->flags |= S_NORMAL_ACTIVE;
1215 return 0;
1216}
1217
1218/*
1219 * This routine is called whenever a serial port is opened. It
1220 * enables interrupts for a serial port, linking in its S structure into
1221 * the IRQ chain. It also performs the serial-specific
1222 * initialization for the tty structure.
1223 */
1224int rs_open(struct tty_struct *tty, struct file * filp)
1225{
1226 struct m68k_serial *info;
1227 int retval, line;
1228
1229 line = tty->index;
1230
1231 if (line >= NR_PORTS || line < 0) /* we have exactly one */
1232 return -ENODEV;
1233
1234 info = &m68k_soft[line];
1235
1236 if (serial_paranoia_check(info, tty->name, "rs_open"))
1237 return -ENODEV;
1238
1239 info->count++;
1240 tty->driver_data = info;
1241 info->tty = tty;
1242
1243 /*
1244 * Start up serial port
1245 */
1246 retval = startup(info);
1247 if (retval)
1248 return retval;
1249
1250 return block_til_ready(tty, filp, info);
1251}
1252
1253/* Finally, routines used to initialize the serial driver. */
1254
1255static void show_serial_version(void)
1256{
1257 printk("MC68328 serial driver version 1.00\n");
1258}
1259
1260static const struct tty_operations rs_ops = {
1261 .open = rs_open,
1262 .close = rs_close,
1263 .write = rs_write,
1264 .flush_chars = rs_flush_chars,
1265 .write_room = rs_write_room,
1266 .chars_in_buffer = rs_chars_in_buffer,
1267 .flush_buffer = rs_flush_buffer,
1268 .ioctl = rs_ioctl,
1269 .throttle = rs_throttle,
1270 .unthrottle = rs_unthrottle,
1271 .set_termios = rs_set_termios,
1272 .stop = rs_stop,
1273 .start = rs_start,
1274 .hangup = rs_hangup,
1275 .set_ldisc = rs_set_ldisc,
1276};
1277
1278/* rs_init inits the driver */
1279static int __init
1280rs68328_init(void)
1281{
1282 int flags, i;
1283 struct m68k_serial *info;
1284
1285 serial_driver = alloc_tty_driver(NR_PORTS);
1286 if (!serial_driver)
1287 return -ENOMEM;
1288
1289 show_serial_version();
1290
1291 /* Initialize the tty_driver structure */
1292 /* SPARC: Not all of this is exactly right for us. */
1293
1294 serial_driver->name = "ttyS";
1295 serial_driver->major = TTY_MAJOR;
1296 serial_driver->minor_start = 64;
1297 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1298 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1299 serial_driver->init_termios = tty_std_termios;
1300 serial_driver->init_termios.c_cflag =
1301 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1302 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1303 tty_set_operations(serial_driver, &rs_ops);
1304
1305 if (tty_register_driver(serial_driver)) {
1306 put_tty_driver(serial_driver);
1307 printk(KERN_ERR "Couldn't register serial driver\n");
1308 return -ENOMEM;
1309 }
1310
1311 local_irq_save(flags);
1312
1313 for(i=0;i<NR_PORTS;i++) {
1314
1315 info = &m68k_soft[i];
1316 info->magic = SERIAL_MAGIC;
1317 info->port = (int) &uart_addr[i];
1318 info->tty = NULL;
1319 info->irq = uart_irqs[i];
1320 info->custom_divisor = 16;
1321 info->close_delay = 50;
1322 info->closing_wait = 3000;
1323 info->x_char = 0;
1324 info->event = 0;
1325 info->count = 0;
1326 info->blocked_open = 0;
1327 INIT_WORK(&info->tqueue, do_softint);
1328 init_waitqueue_head(&info->open_wait);
1329 init_waitqueue_head(&info->close_wait);
1330 info->line = i;
1331 info->is_cons = 1; /* Means shortcuts work */
1332
1333 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1334 info->port, info->irq);
1335 printk(" is a builtin MC68328 UART\n");
1336
1337#ifdef CONFIG_M68VZ328
1338 if (i > 0 )
1339 PJSEL &= 0xCF; /* PSW enable second port output */
1340#endif
1341
1342 if (request_irq(uart_irqs[i],
1343 rs_interrupt,
1344 IRQF_DISABLED,
1345 "M68328_UART", info))
1346 panic("Unable to attach 68328 serial interrupt\n");
1347 }
1348 local_irq_restore(flags);
1349 return 0;
1350}
1351
1352module_init(rs68328_init);
1353
1354
1355
1356static void m68328_set_baud(void)
1357{
1358 unsigned short ustcnt;
1359 int i;
1360
1361 ustcnt = USTCNT;
1362 USTCNT = ustcnt & ~USTCNT_TXEN;
1363
1364again:
1365 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1366 if (baud_table[i] == m68328_console_baud)
1367 break;
1368 if (i >= ARRAY_SIZE(baud_table)) {
1369 m68328_console_baud = 9600;
1370 goto again;
1371 }
1372
1373 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1374 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1375 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1376 ustcnt |= USTCNT_8_7;
1377 ustcnt |= USTCNT_TXEN;
1378 USTCNT = ustcnt;
1379 m68328_console_initted = 1;
1380 return;
1381}
1382
1383
1384int m68328_console_setup(struct console *cp, char *arg)
1385{
1386 int i, n = CONSOLE_BAUD_RATE;
1387
1388 if (!cp)
1389 return(-1);
1390
1391 if (arg)
1392 n = simple_strtoul(arg,NULL,0);
1393
1394 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1395 if (baud_table[i] == n)
1396 break;
1397 if (i < ARRAY_SIZE(baud_table)) {
1398 m68328_console_baud = n;
1399 m68328_console_cbaud = 0;
1400 if (i > 15) {
1401 m68328_console_cbaud |= CBAUDEX;
1402 i -= 15;
1403 }
1404 m68328_console_cbaud |= i;
1405 }
1406
1407 m68328_set_baud(); /* make sure baud rate changes */
1408 return(0);
1409}
1410
1411
1412static struct tty_driver *m68328_console_device(struct console *c, int *index)
1413{
1414 *index = c->index;
1415 return serial_driver;
1416}
1417
1418
1419void m68328_console_write (struct console *co, const char *str,
1420 unsigned int count)
1421{
1422 if (!m68328_console_initted)
1423 m68328_set_baud();
1424 while (count--) {
1425 if (*str == '\n')
1426 rs_put_char('\r');
1427 rs_put_char( *str++ );
1428 }
1429}
1430
1431
1432static struct console m68328_driver = {
1433 .name = "ttyS",
1434 .write = m68328_console_write,
1435 .device = m68328_console_device,
1436 .setup = m68328_console_setup,
1437 .flags = CON_PRINTBUFFER,
1438 .index = -1,
1439};
1440
1441
1442static int __init m68328_console_init(void)
1443{
1444 register_console(&m68328_driver);
1445 return 0;
1446}
1447
1448console_initcall(m68328_console_init);