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TTY: use tty_port_link_device
[deliverable/linux.git] / drivers / tty / serial / 68328serial.c
1 /* 68328serial.c: Serial port driver for 68328 microcontroller
2 *
3 * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
4 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
5 * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
6 * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
7 * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com>
8 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
9 *
10 * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca>
11 * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au>
12 * Power management support Daniel Potts <danielp@cse.unsw.edu.au>
13 * VZ Second Serial Port enable Phil Wilshire
14 * 2.4/2.5 port David McCullough
15 */
16
17 #include <asm/dbg.h>
18 #include <linux/module.h>
19 #include <linux/errno.h>
20 #include <linux/serial.h>
21 #include <linux/signal.h>
22 #include <linux/sched.h>
23 #include <linux/timer.h>
24 #include <linux/interrupt.h>
25 #include <linux/tty.h>
26 #include <linux/tty_flip.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 #include <linux/gfp.h>
40
41 #include <asm/io.h>
42 #include <asm/irq.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 /* Turn off usage of real serial interrupt code, to "support" Copilot */
61 #ifdef CONFIG_XCOPILOT_BUGS
62 #undef USE_INTS
63 #else
64 #define USE_INTS
65 #endif
66
67 /*
68 * I believe this is the optimal setting that reduces the number of interrupts.
69 * At high speeds the output might become a little "bursted" (use USTCNT_TXHE
70 * if that bothers you), but in most cases it will not, since we try to
71 * transmit characters every time rs_interrupt is called. Thus, quite often
72 * you'll see that a receive interrupt occures before the transmit one.
73 * -- Vladimir Gurevich
74 */
75 #define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
76
77 /*
78 * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
79 * "Old data interrupt" which occures whenever the data stay in the FIFO
80 * longer than 30 bits time. This allows us to use FIFO without compromising
81 * latency. '328 does not have this feature and without the real 328-based
82 * board I would assume that RXRE is the safest setting.
83 *
84 * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
85 * interrupts. RXFE (receive queue full) causes the system to lose data
86 * at least at 115200 baud
87 *
88 * If your board is busy doing other stuff, you might consider to use
89 * RXRE (data ready intrrupt) instead.
90 *
91 * The other option is to make these INTR masks run-time configurable, so
92 * that people can dynamically adapt them according to the current usage.
93 * -- Vladimir Gurevich
94 */
95
96 /* (es) */
97 #if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
98 #define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
99 #elif defined(CONFIG_M68328)
100 #define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
101 #else
102 #error Please, define the Rx interrupt events for your CPU
103 #endif
104 /* (/es) */
105
106 /*
107 * This is our internal structure for each serial port's state.
108 */
109 struct m68k_serial {
110 struct tty_port tport;
111 char is_cons; /* Is this our console. */
112 int magic;
113 int baud_base;
114 int port;
115 int irq;
116 int type; /* UART type */
117 int custom_divisor;
118 int x_char; /* xon/xoff character */
119 int line;
120 unsigned char *xmit_buf;
121 int xmit_head;
122 int xmit_tail;
123 int xmit_cnt;
124 };
125
126 #define SERIAL_MAGIC 0x5301
127
128 /*
129 * Define the number of ports supported and their irqs.
130 */
131 #define NR_PORTS 1
132
133 static struct m68k_serial m68k_soft[NR_PORTS];
134
135 static unsigned int uart_irqs[NR_PORTS] = { UART_IRQ_NUM };
136
137 /* multiple ports are contiguous in memory */
138 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
139
140 struct tty_driver *serial_driver;
141
142 static void change_speed(struct m68k_serial *info, struct tty_struct *tty);
143
144 /*
145 * Setup for console. Argument comes from the boot command line.
146 */
147
148 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
149 #ifdef CONFIG_M68VZ328
150 #define CONSOLE_BAUD_RATE 19200
151 #define DEFAULT_CBAUD B19200
152 #endif
153
154
155 #ifndef CONSOLE_BAUD_RATE
156 #define CONSOLE_BAUD_RATE 9600
157 #define DEFAULT_CBAUD B9600
158 #endif
159
160
161 static int m68328_console_initted = 0;
162 static int m68328_console_baud = CONSOLE_BAUD_RATE;
163 static int m68328_console_cbaud = DEFAULT_CBAUD;
164
165
166 static inline int serial_paranoia_check(struct m68k_serial *info,
167 char *name, const char *routine)
168 {
169 #ifdef SERIAL_PARANOIA_CHECK
170 static const char *badmagic =
171 "Warning: bad magic number for serial struct %s in %s\n";
172 static const char *badinfo =
173 "Warning: null m68k_serial for %s in %s\n";
174
175 if (!info) {
176 printk(badinfo, name, routine);
177 return 1;
178 }
179 if (info->magic != SERIAL_MAGIC) {
180 printk(badmagic, name, routine);
181 return 1;
182 }
183 #endif
184 return 0;
185 }
186
187 /*
188 * This is used to figure out the divisor speeds and the timeouts
189 */
190 static int baud_table[] = {
191 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
192 9600, 19200, 38400, 57600, 115200, 0 };
193
194 /* Utility routines */
195 static inline int get_baud(struct m68k_serial *ss)
196 {
197 unsigned long result = 115200;
198 unsigned short int baud = uart_addr[ss->line].ubaud;
199 if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
200 result >>= GET_FIELD(baud, UBAUD_DIVIDE);
201
202 return result;
203 }
204
205 /*
206 * ------------------------------------------------------------
207 * rs_stop() and rs_start()
208 *
209 * This routines are called before setting or resetting tty->stopped.
210 * They enable or disable transmitter interrupts, as necessary.
211 * ------------------------------------------------------------
212 */
213 static void rs_stop(struct tty_struct *tty)
214 {
215 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
216 m68328_uart *uart = &uart_addr[info->line];
217 unsigned long flags;
218
219 if (serial_paranoia_check(info, tty->name, "rs_stop"))
220 return;
221
222 local_irq_save(flags);
223 uart->ustcnt &= ~USTCNT_TXEN;
224 local_irq_restore(flags);
225 }
226
227 static int rs_put_char(char ch)
228 {
229 unsigned long flags;
230 int loops = 0;
231
232 local_irq_save(flags);
233
234 while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
235 loops++;
236 udelay(5);
237 }
238
239 UTX_TXDATA = ch;
240 udelay(5);
241 local_irq_restore(flags);
242 return 1;
243 }
244
245 static void rs_start(struct tty_struct *tty)
246 {
247 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
248 m68328_uart *uart = &uart_addr[info->line];
249 unsigned long flags;
250
251 if (serial_paranoia_check(info, tty->name, "rs_start"))
252 return;
253
254 local_irq_save(flags);
255 if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
256 #ifdef USE_INTS
257 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
258 #else
259 uart->ustcnt |= USTCNT_TXEN;
260 #endif
261 }
262 local_irq_restore(flags);
263 }
264
265 static void receive_chars(struct m68k_serial *info, struct tty_struct *tty,
266 unsigned short rx)
267 {
268 m68328_uart *uart = &uart_addr[info->line];
269 unsigned char ch, flag;
270
271 /*
272 * This do { } while() loop will get ALL chars out of Rx FIFO
273 */
274 #ifndef CONFIG_XCOPILOT_BUGS
275 do {
276 #endif
277 ch = GET_FIELD(rx, URX_RXDATA);
278
279 if(info->is_cons) {
280 if(URX_BREAK & rx) { /* whee, break received */
281 return;
282 #ifdef CONFIG_MAGIC_SYSRQ
283 } else if (ch == 0x10) { /* ^P */
284 show_state();
285 show_free_areas(0);
286 show_buffers();
287 /* show_net_buffers(); */
288 return;
289 } else if (ch == 0x12) { /* ^R */
290 emergency_restart();
291 return;
292 #endif /* CONFIG_MAGIC_SYSRQ */
293 }
294 }
295
296 if(!tty)
297 goto clear_and_exit;
298
299 flag = TTY_NORMAL;
300
301 if (rx & URX_PARITY_ERROR)
302 flag = TTY_PARITY;
303 else if (rx & URX_OVRUN)
304 flag = TTY_OVERRUN;
305 else if (rx & URX_FRAME_ERROR)
306 flag = TTY_FRAME;
307
308 tty_insert_flip_char(tty, ch, flag);
309 #ifndef CONFIG_XCOPILOT_BUGS
310 } while((rx = uart->urx.w) & URX_DATA_READY);
311 #endif
312
313 tty_schedule_flip(tty);
314
315 clear_and_exit:
316 return;
317 }
318
319 static void transmit_chars(struct m68k_serial *info, struct tty_struct *tty)
320 {
321 m68328_uart *uart = &uart_addr[info->line];
322
323 if (info->x_char) {
324 /* Send next char */
325 uart->utx.b.txdata = info->x_char;
326 info->x_char = 0;
327 goto clear_and_return;
328 }
329
330 if ((info->xmit_cnt <= 0) || !tty || tty->stopped) {
331 /* That's peculiar... TX ints off */
332 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
333 goto clear_and_return;
334 }
335
336 /* Send char */
337 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
338 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
339 info->xmit_cnt--;
340
341 if(info->xmit_cnt <= 0) {
342 /* All done for now... TX ints off */
343 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
344 goto clear_and_return;
345 }
346
347 clear_and_return:
348 /* Clear interrupt (should be auto)*/
349 return;
350 }
351
352 /*
353 * This is the serial driver's generic interrupt routine
354 */
355 irqreturn_t rs_interrupt(int irq, void *dev_id)
356 {
357 struct m68k_serial *info = dev_id;
358 struct tty_struct *tty = tty_port_tty_get(&info->tport);
359 m68328_uart *uart;
360 unsigned short rx;
361 unsigned short tx;
362
363 uart = &uart_addr[info->line];
364 rx = uart->urx.w;
365
366 #ifdef USE_INTS
367 tx = uart->utx.w;
368
369 if (rx & URX_DATA_READY)
370 receive_chars(info, tty, rx);
371 if (tx & UTX_TX_AVAIL)
372 transmit_chars(info, tty);
373 #else
374 receive_chars(info, tty, rx);
375 #endif
376 tty_kref_put(tty);
377
378 return IRQ_HANDLED;
379 }
380
381 static int startup(struct m68k_serial *info, struct tty_struct *tty)
382 {
383 m68328_uart *uart = &uart_addr[info->line];
384 unsigned long flags;
385
386 if (info->tport.flags & ASYNC_INITIALIZED)
387 return 0;
388
389 if (!info->xmit_buf) {
390 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
391 if (!info->xmit_buf)
392 return -ENOMEM;
393 }
394
395 local_irq_save(flags);
396
397 /*
398 * Clear the FIFO buffers and disable them
399 * (they will be reenabled in change_speed())
400 */
401
402 uart->ustcnt = USTCNT_UEN;
403 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
404 (void)uart->urx.w;
405
406 /*
407 * Finally, enable sequencing and interrupts
408 */
409 #ifdef USE_INTS
410 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
411 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
412 #else
413 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
414 #endif
415
416 if (tty)
417 clear_bit(TTY_IO_ERROR, &tty->flags);
418 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
419
420 /*
421 * and set the speed of the serial port
422 */
423
424 change_speed(info, tty);
425
426 info->tport.flags |= ASYNC_INITIALIZED;
427 local_irq_restore(flags);
428 return 0;
429 }
430
431 /*
432 * This routine will shutdown a serial port; interrupts are disabled, and
433 * DTR is dropped if the hangup on close termio flag is on.
434 */
435 static void shutdown(struct m68k_serial *info, struct tty_struct *tty)
436 {
437 m68328_uart *uart = &uart_addr[info->line];
438 unsigned long flags;
439
440 uart->ustcnt = 0; /* All off! */
441 if (!(info->tport.flags & ASYNC_INITIALIZED))
442 return;
443
444 local_irq_save(flags);
445
446 if (info->xmit_buf) {
447 free_page((unsigned long) info->xmit_buf);
448 info->xmit_buf = 0;
449 }
450
451 if (tty)
452 set_bit(TTY_IO_ERROR, &tty->flags);
453
454 info->tport.flags &= ~ASYNC_INITIALIZED;
455 local_irq_restore(flags);
456 }
457
458 struct {
459 int divisor, prescale;
460 }
461 #ifndef CONFIG_M68VZ328
462 hw_baud_table[18] = {
463 {0,0}, /* 0 */
464 {0,0}, /* 50 */
465 {0,0}, /* 75 */
466 {0,0}, /* 110 */
467 {0,0}, /* 134 */
468 {0,0}, /* 150 */
469 {0,0}, /* 200 */
470 {7,0x26}, /* 300 */
471 {6,0x26}, /* 600 */
472 {5,0x26}, /* 1200 */
473 {0,0}, /* 1800 */
474 {4,0x26}, /* 2400 */
475 {3,0x26}, /* 4800 */
476 {2,0x26}, /* 9600 */
477 {1,0x26}, /* 19200 */
478 {0,0x26}, /* 38400 */
479 {1,0x38}, /* 57600 */
480 {0,0x38}, /* 115200 */
481 };
482 #else
483 hw_baud_table[18] = {
484 {0,0}, /* 0 */
485 {0,0}, /* 50 */
486 {0,0}, /* 75 */
487 {0,0}, /* 110 */
488 {0,0}, /* 134 */
489 {0,0}, /* 150 */
490 {0,0}, /* 200 */
491 {0,0}, /* 300 */
492 {7,0x26}, /* 600 */
493 {6,0x26}, /* 1200 */
494 {0,0}, /* 1800 */
495 {5,0x26}, /* 2400 */
496 {4,0x26}, /* 4800 */
497 {3,0x26}, /* 9600 */
498 {2,0x26}, /* 19200 */
499 {1,0x26}, /* 38400 */
500 {0,0x26}, /* 57600 */
501 {1,0x38}, /* 115200 */
502 };
503 #endif
504 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
505
506 /*
507 * This routine is called to set the UART divisor registers to match
508 * the specified baud rate for a serial port.
509 */
510 static void change_speed(struct m68k_serial *info, struct tty_struct *tty)
511 {
512 m68328_uart *uart = &uart_addr[info->line];
513 unsigned short port;
514 unsigned short ustcnt;
515 unsigned cflag;
516 int i;
517
518 cflag = tty->termios.c_cflag;
519 if (!(port = info->port))
520 return;
521
522 ustcnt = uart->ustcnt;
523 uart->ustcnt = ustcnt & ~USTCNT_TXEN;
524
525 i = cflag & CBAUD;
526 if (i & CBAUDEX) {
527 i = (i & ~CBAUDEX) + B38400;
528 }
529
530 uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
531 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
532
533 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
534
535 if ((cflag & CSIZE) == CS8)
536 ustcnt |= USTCNT_8_7;
537
538 if (cflag & CSTOPB)
539 ustcnt |= USTCNT_STOP;
540
541 if (cflag & PARENB)
542 ustcnt |= USTCNT_PARITYEN;
543 if (cflag & PARODD)
544 ustcnt |= USTCNT_ODD_EVEN;
545
546 #ifdef CONFIG_SERIAL_68328_RTS_CTS
547 if (cflag & CRTSCTS) {
548 uart->utx.w &= ~ UTX_NOCTS;
549 } else {
550 uart->utx.w |= UTX_NOCTS;
551 }
552 #endif
553
554 ustcnt |= USTCNT_TXEN;
555
556 uart->ustcnt = ustcnt;
557 return;
558 }
559
560 /*
561 * Fair output driver allows a process to speak.
562 */
563 static void rs_fair_output(void)
564 {
565 int left; /* Output no more than that */
566 unsigned long flags;
567 struct m68k_serial *info = &m68k_soft[0];
568 char c;
569
570 if (info == 0) return;
571 if (info->xmit_buf == 0) return;
572
573 local_irq_save(flags);
574 left = info->xmit_cnt;
575 while (left != 0) {
576 c = info->xmit_buf[info->xmit_tail];
577 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
578 info->xmit_cnt--;
579 local_irq_restore(flags);
580
581 rs_put_char(c);
582
583 local_irq_save(flags);
584 left = min(info->xmit_cnt, left-1);
585 }
586
587 /* Last character is being transmitted now (hopefully). */
588 udelay(5);
589
590 local_irq_restore(flags);
591 return;
592 }
593
594 /*
595 * m68k_console_print is registered for printk.
596 */
597 void console_print_68328(const char *p)
598 {
599 char c;
600
601 while((c=*(p++)) != 0) {
602 if(c == '\n')
603 rs_put_char('\r');
604 rs_put_char(c);
605 }
606
607 /* Comment this if you want to have a strict interrupt-driven output */
608 rs_fair_output();
609
610 return;
611 }
612
613 static void rs_set_ldisc(struct tty_struct *tty)
614 {
615 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
616
617 if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
618 return;
619
620 info->is_cons = (tty->termios.c_line == N_TTY);
621
622 printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
623 }
624
625 static void rs_flush_chars(struct tty_struct *tty)
626 {
627 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
628 m68328_uart *uart = &uart_addr[info->line];
629 unsigned long flags;
630
631 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
632 return;
633 #ifndef USE_INTS
634 for(;;) {
635 #endif
636
637 /* Enable transmitter */
638 local_irq_save(flags);
639
640 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
641 !info->xmit_buf) {
642 local_irq_restore(flags);
643 return;
644 }
645
646 #ifdef USE_INTS
647 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
648 #else
649 uart->ustcnt |= USTCNT_TXEN;
650 #endif
651
652 #ifdef USE_INTS
653 if (uart->utx.w & UTX_TX_AVAIL) {
654 #else
655 if (1) {
656 #endif
657 /* Send char */
658 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
659 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
660 info->xmit_cnt--;
661 }
662
663 #ifndef USE_INTS
664 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
665 }
666 #endif
667 local_irq_restore(flags);
668 }
669
670 extern void console_printn(const char * b, int count);
671
672 static int rs_write(struct tty_struct * tty,
673 const unsigned char *buf, int count)
674 {
675 int c, total = 0;
676 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
677 m68328_uart *uart = &uart_addr[info->line];
678 unsigned long flags;
679
680 if (serial_paranoia_check(info, tty->name, "rs_write"))
681 return 0;
682
683 if (!tty || !info->xmit_buf)
684 return 0;
685
686 local_save_flags(flags);
687 while (1) {
688 local_irq_disable();
689 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
690 SERIAL_XMIT_SIZE - info->xmit_head));
691 local_irq_restore(flags);
692
693 if (c <= 0)
694 break;
695
696 memcpy(info->xmit_buf + info->xmit_head, buf, c);
697
698 local_irq_disable();
699 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
700 info->xmit_cnt += c;
701 local_irq_restore(flags);
702 buf += c;
703 count -= c;
704 total += c;
705 }
706
707 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
708 /* Enable transmitter */
709 local_irq_disable();
710 #ifndef USE_INTS
711 while(info->xmit_cnt) {
712 #endif
713
714 uart->ustcnt |= USTCNT_TXEN;
715 #ifdef USE_INTS
716 uart->ustcnt |= USTCNT_TX_INTR_MASK;
717 #else
718 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
719 #endif
720 if (uart->utx.w & UTX_TX_AVAIL) {
721 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
722 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
723 info->xmit_cnt--;
724 }
725
726 #ifndef USE_INTS
727 }
728 #endif
729 local_irq_restore(flags);
730 }
731
732 return total;
733 }
734
735 static int rs_write_room(struct tty_struct *tty)
736 {
737 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
738 int ret;
739
740 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
741 return 0;
742 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
743 if (ret < 0)
744 ret = 0;
745 return ret;
746 }
747
748 static int rs_chars_in_buffer(struct tty_struct *tty)
749 {
750 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
751
752 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
753 return 0;
754 return info->xmit_cnt;
755 }
756
757 static void rs_flush_buffer(struct tty_struct *tty)
758 {
759 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
760 unsigned long flags;
761
762 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
763 return;
764 local_irq_save(flags);
765 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
766 local_irq_restore(flags);
767 tty_wakeup(tty);
768 }
769
770 /*
771 * ------------------------------------------------------------
772 * rs_throttle()
773 *
774 * This routine is called by the upper-layer tty layer to signal that
775 * incoming characters should be throttled.
776 * ------------------------------------------------------------
777 */
778 static void rs_throttle(struct tty_struct * tty)
779 {
780 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
781
782 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
783 return;
784
785 if (I_IXOFF(tty))
786 info->x_char = STOP_CHAR(tty);
787
788 /* Turn off RTS line (do this atomic) */
789 }
790
791 static void rs_unthrottle(struct tty_struct * tty)
792 {
793 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
794
795 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
796 return;
797
798 if (I_IXOFF(tty)) {
799 if (info->x_char)
800 info->x_char = 0;
801 else
802 info->x_char = START_CHAR(tty);
803 }
804
805 /* Assert RTS line (do this atomic) */
806 }
807
808 /*
809 * ------------------------------------------------------------
810 * rs_ioctl() and friends
811 * ------------------------------------------------------------
812 */
813
814 static int get_serial_info(struct m68k_serial * info,
815 struct serial_struct * retinfo)
816 {
817 struct serial_struct tmp;
818
819 if (!retinfo)
820 return -EFAULT;
821 memset(&tmp, 0, sizeof(tmp));
822 tmp.type = info->type;
823 tmp.line = info->line;
824 tmp.port = info->port;
825 tmp.irq = info->irq;
826 tmp.flags = info->tport.flags;
827 tmp.baud_base = info->baud_base;
828 tmp.close_delay = info->tport.close_delay;
829 tmp.closing_wait = info->tport.closing_wait;
830 tmp.custom_divisor = info->custom_divisor;
831 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
832 return -EFAULT;
833
834 return 0;
835 }
836
837 static int set_serial_info(struct m68k_serial *info, struct tty_struct *tty,
838 struct serial_struct * new_info)
839 {
840 struct tty_port *port = &info->tport;
841 struct serial_struct new_serial;
842 struct m68k_serial old_info;
843 int retval = 0;
844
845 if (!new_info)
846 return -EFAULT;
847 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
848 return -EFAULT;
849 old_info = *info;
850
851 if (!capable(CAP_SYS_ADMIN)) {
852 if ((new_serial.baud_base != info->baud_base) ||
853 (new_serial.type != info->type) ||
854 (new_serial.close_delay != port->close_delay) ||
855 ((new_serial.flags & ~ASYNC_USR_MASK) !=
856 (port->flags & ~ASYNC_USR_MASK)))
857 return -EPERM;
858 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
859 (new_serial.flags & ASYNC_USR_MASK));
860 info->custom_divisor = new_serial.custom_divisor;
861 goto check_and_exit;
862 }
863
864 if (port->count > 1)
865 return -EBUSY;
866
867 /*
868 * OK, past this point, all the error checking has been done.
869 * At this point, we start making changes.....
870 */
871
872 info->baud_base = new_serial.baud_base;
873 port->flags = ((port->flags & ~ASYNC_FLAGS) |
874 (new_serial.flags & ASYNC_FLAGS));
875 info->type = new_serial.type;
876 port->close_delay = new_serial.close_delay;
877 port->closing_wait = new_serial.closing_wait;
878
879 check_and_exit:
880 retval = startup(info, tty);
881 return retval;
882 }
883
884 /*
885 * get_lsr_info - get line status register info
886 *
887 * Purpose: Let user call ioctl() to get info when the UART physically
888 * is emptied. On bus types like RS485, the transmitter must
889 * release the bus after transmitting. This must be done when
890 * the transmit shift register is empty, not be done when the
891 * transmit holding register is empty. This functionality
892 * allows an RS485 driver to be written in user space.
893 */
894 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
895 {
896 #ifdef CONFIG_SERIAL_68328_RTS_CTS
897 m68328_uart *uart = &uart_addr[info->line];
898 #endif
899 unsigned char status;
900 unsigned long flags;
901
902 local_irq_save(flags);
903 #ifdef CONFIG_SERIAL_68328_RTS_CTS
904 status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
905 #else
906 status = 0;
907 #endif
908 local_irq_restore(flags);
909 return put_user(status, value);
910 }
911
912 /*
913 * This routine sends a break character out the serial port.
914 */
915 static void send_break(struct m68k_serial * info, unsigned int duration)
916 {
917 m68328_uart *uart = &uart_addr[info->line];
918 unsigned long flags;
919 if (!info->port)
920 return;
921 local_irq_save(flags);
922 #ifdef USE_INTS
923 uart->utx.w |= UTX_SEND_BREAK;
924 msleep_interruptible(duration);
925 uart->utx.w &= ~UTX_SEND_BREAK;
926 #endif
927 local_irq_restore(flags);
928 }
929
930 static int rs_ioctl(struct tty_struct *tty,
931 unsigned int cmd, unsigned long arg)
932 {
933 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
934 int retval;
935
936 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
937 return -ENODEV;
938
939 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
940 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
941 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
942 if (tty->flags & (1 << TTY_IO_ERROR))
943 return -EIO;
944 }
945
946 switch (cmd) {
947 case TCSBRK: /* SVID version: non-zero arg --> no break */
948 retval = tty_check_change(tty);
949 if (retval)
950 return retval;
951 tty_wait_until_sent(tty, 0);
952 if (!arg)
953 send_break(info, 250); /* 1/4 second */
954 return 0;
955 case TCSBRKP: /* support for POSIX tcsendbreak() */
956 retval = tty_check_change(tty);
957 if (retval)
958 return retval;
959 tty_wait_until_sent(tty, 0);
960 send_break(info, arg ? arg*(100) : 250);
961 return 0;
962 case TIOCGSERIAL:
963 return get_serial_info(info,
964 (struct serial_struct *) arg);
965 case TIOCSSERIAL:
966 return set_serial_info(info, tty,
967 (struct serial_struct *) arg);
968 case TIOCSERGETLSR: /* Get line status register */
969 return get_lsr_info(info, (unsigned int *) arg);
970 case TIOCSERGSTRUCT:
971 if (copy_to_user((struct m68k_serial *) arg,
972 info, sizeof(struct m68k_serial)))
973 return -EFAULT;
974 return 0;
975 default:
976 return -ENOIOCTLCMD;
977 }
978 return 0;
979 }
980
981 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
982 {
983 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
984
985 change_speed(info, tty);
986
987 if ((old_termios->c_cflag & CRTSCTS) &&
988 !(tty->termios.c_cflag & CRTSCTS)) {
989 tty->hw_stopped = 0;
990 rs_start(tty);
991 }
992
993 }
994
995 /*
996 * ------------------------------------------------------------
997 * rs_close()
998 *
999 * This routine is called when the serial port gets closed. First, we
1000 * wait for the last remaining data to be sent. Then, we unlink its
1001 * S structure from the interrupt chain if necessary, and we free
1002 * that IRQ if nothing is left in the chain.
1003 * ------------------------------------------------------------
1004 */
1005 static void rs_close(struct tty_struct *tty, struct file * filp)
1006 {
1007 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1008 struct tty_port *port = &info->tport;
1009 m68328_uart *uart = &uart_addr[info->line];
1010 unsigned long flags;
1011
1012 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1013 return;
1014
1015 local_irq_save(flags);
1016
1017 if (tty_hung_up_p(filp)) {
1018 local_irq_restore(flags);
1019 return;
1020 }
1021
1022 if ((tty->count == 1) && (port->count != 1)) {
1023 /*
1024 * Uh, oh. tty->count is 1, which means that the tty
1025 * structure will be freed. Info->count should always
1026 * be one in these conditions. If it's greater than
1027 * one, we've got real problems, since it means the
1028 * serial port won't be shutdown.
1029 */
1030 printk("rs_close: bad serial port count; tty->count is 1, "
1031 "port->count is %d\n", port->count);
1032 port->count = 1;
1033 }
1034 if (--port->count < 0) {
1035 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1036 info->line, port->count);
1037 port->count = 0;
1038 }
1039 if (port->count) {
1040 local_irq_restore(flags);
1041 return;
1042 }
1043 port->flags |= ASYNC_CLOSING;
1044 /*
1045 * Now we wait for the transmit buffer to clear; and we notify
1046 * the line discipline to only process XON/XOFF characters.
1047 */
1048 tty->closing = 1;
1049 if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1050 tty_wait_until_sent(tty, port->closing_wait);
1051 /*
1052 * At this point we stop accepting input. To do this, we
1053 * disable the receive line status interrupts, and tell the
1054 * interrupt driver to stop checking the data ready bit in the
1055 * line status register.
1056 */
1057
1058 uart->ustcnt &= ~USTCNT_RXEN;
1059 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1060
1061 shutdown(info, tty);
1062 rs_flush_buffer(tty);
1063
1064 tty_ldisc_flush(tty);
1065 tty->closing = 0;
1066 tty_port_tty_set(&info->tport, NULL);
1067 #warning "This is not and has never been valid so fix it"
1068 #if 0
1069 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1070 if (tty->ldisc.close)
1071 (tty->ldisc.close)(tty);
1072 tty->ldisc = ldiscs[N_TTY];
1073 tty->termios.c_line = N_TTY;
1074 if (tty->ldisc.open)
1075 (tty->ldisc.open)(tty);
1076 }
1077 #endif
1078 if (port->blocked_open) {
1079 if (port->close_delay)
1080 msleep_interruptible(jiffies_to_msecs(port->close_delay));
1081 wake_up_interruptible(&port->open_wait);
1082 }
1083 port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1084 wake_up_interruptible(&port->close_wait);
1085 local_irq_restore(flags);
1086 }
1087
1088 /*
1089 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1090 */
1091 void rs_hangup(struct tty_struct *tty)
1092 {
1093 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1094
1095 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1096 return;
1097
1098 rs_flush_buffer(tty);
1099 shutdown(info, tty);
1100 info->tport.count = 0;
1101 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
1102 tty_port_tty_set(&info->tport, NULL);
1103 wake_up_interruptible(&info->tport.open_wait);
1104 }
1105
1106 /*
1107 * This routine is called whenever a serial port is opened. It
1108 * enables interrupts for a serial port, linking in its S structure into
1109 * the IRQ chain. It also performs the serial-specific
1110 * initialization for the tty structure.
1111 */
1112 int rs_open(struct tty_struct *tty, struct file * filp)
1113 {
1114 struct m68k_serial *info;
1115 int retval;
1116
1117 info = &m68k_soft[tty->index];
1118
1119 if (serial_paranoia_check(info, tty->name, "rs_open"))
1120 return -ENODEV;
1121
1122 info->tport.count++;
1123 tty->driver_data = info;
1124 tty_port_tty_set(&info->tport, tty);
1125
1126 /*
1127 * Start up serial port
1128 */
1129 retval = startup(info, tty);
1130 if (retval)
1131 return retval;
1132
1133 return tty_port_block_til_ready(&info->tport, tty, filp);
1134 }
1135
1136 /* Finally, routines used to initialize the serial driver. */
1137
1138 static void show_serial_version(void)
1139 {
1140 printk("MC68328 serial driver version 1.00\n");
1141 }
1142
1143 static const struct tty_operations rs_ops = {
1144 .open = rs_open,
1145 .close = rs_close,
1146 .write = rs_write,
1147 .flush_chars = rs_flush_chars,
1148 .write_room = rs_write_room,
1149 .chars_in_buffer = rs_chars_in_buffer,
1150 .flush_buffer = rs_flush_buffer,
1151 .ioctl = rs_ioctl,
1152 .throttle = rs_throttle,
1153 .unthrottle = rs_unthrottle,
1154 .set_termios = rs_set_termios,
1155 .stop = rs_stop,
1156 .start = rs_start,
1157 .hangup = rs_hangup,
1158 .set_ldisc = rs_set_ldisc,
1159 };
1160
1161 static const struct tty_port_operations rs_port_ops = {
1162 };
1163
1164 /* rs_init inits the driver */
1165 static int __init
1166 rs68328_init(void)
1167 {
1168 unsigned long flags;
1169 int i;
1170 struct m68k_serial *info;
1171
1172 serial_driver = alloc_tty_driver(NR_PORTS);
1173 if (!serial_driver)
1174 return -ENOMEM;
1175
1176 show_serial_version();
1177
1178 /* Initialize the tty_driver structure */
1179 /* SPARC: Not all of this is exactly right for us. */
1180
1181 serial_driver->name = "ttyS";
1182 serial_driver->major = TTY_MAJOR;
1183 serial_driver->minor_start = 64;
1184 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1185 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1186 serial_driver->init_termios = tty_std_termios;
1187 serial_driver->init_termios.c_cflag =
1188 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1189 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1190 tty_set_operations(serial_driver, &rs_ops);
1191
1192 local_irq_save(flags);
1193
1194 for(i=0;i<NR_PORTS;i++) {
1195
1196 info = &m68k_soft[i];
1197 tty_port_init(&info->tport);
1198 info->tport.ops = &rs_port_ops;
1199 info->magic = SERIAL_MAGIC;
1200 info->port = (int) &uart_addr[i];
1201 info->irq = uart_irqs[i];
1202 info->custom_divisor = 16;
1203 info->x_char = 0;
1204 info->line = i;
1205 info->is_cons = 1; /* Means shortcuts work */
1206
1207 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1208 info->port, info->irq);
1209 printk(" is a builtin MC68328 UART\n");
1210
1211 #ifdef CONFIG_M68VZ328
1212 if (i > 0 )
1213 PJSEL &= 0xCF; /* PSW enable second port output */
1214 #endif
1215
1216 if (request_irq(uart_irqs[i],
1217 rs_interrupt,
1218 0,
1219 "M68328_UART", info))
1220 panic("Unable to attach 68328 serial interrupt\n");
1221
1222 tty_port_link_device(&info->tport, serial_driver, i);
1223 }
1224 local_irq_restore(flags);
1225
1226 if (tty_register_driver(serial_driver)) {
1227 put_tty_driver(serial_driver);
1228 printk(KERN_ERR "Couldn't register serial driver\n");
1229 return -ENOMEM;
1230 }
1231
1232 return 0;
1233 }
1234
1235 module_init(rs68328_init);
1236
1237
1238
1239 static void m68328_set_baud(void)
1240 {
1241 unsigned short ustcnt;
1242 int i;
1243
1244 ustcnt = USTCNT;
1245 USTCNT = ustcnt & ~USTCNT_TXEN;
1246
1247 again:
1248 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1249 if (baud_table[i] == m68328_console_baud)
1250 break;
1251 if (i >= ARRAY_SIZE(baud_table)) {
1252 m68328_console_baud = 9600;
1253 goto again;
1254 }
1255
1256 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1257 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1258 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1259 ustcnt |= USTCNT_8_7;
1260 ustcnt |= USTCNT_TXEN;
1261 USTCNT = ustcnt;
1262 m68328_console_initted = 1;
1263 return;
1264 }
1265
1266
1267 int m68328_console_setup(struct console *cp, char *arg)
1268 {
1269 int i, n = CONSOLE_BAUD_RATE;
1270
1271 if (!cp)
1272 return(-1);
1273
1274 if (arg)
1275 n = simple_strtoul(arg,NULL,0);
1276
1277 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1278 if (baud_table[i] == n)
1279 break;
1280 if (i < ARRAY_SIZE(baud_table)) {
1281 m68328_console_baud = n;
1282 m68328_console_cbaud = 0;
1283 if (i > 15) {
1284 m68328_console_cbaud |= CBAUDEX;
1285 i -= 15;
1286 }
1287 m68328_console_cbaud |= i;
1288 }
1289
1290 m68328_set_baud(); /* make sure baud rate changes */
1291 return(0);
1292 }
1293
1294
1295 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1296 {
1297 *index = c->index;
1298 return serial_driver;
1299 }
1300
1301
1302 void m68328_console_write (struct console *co, const char *str,
1303 unsigned int count)
1304 {
1305 if (!m68328_console_initted)
1306 m68328_set_baud();
1307 while (count--) {
1308 if (*str == '\n')
1309 rs_put_char('\r');
1310 rs_put_char( *str++ );
1311 }
1312 }
1313
1314
1315 static struct console m68328_driver = {
1316 .name = "ttyS",
1317 .write = m68328_console_write,
1318 .device = m68328_console_device,
1319 .setup = m68328_console_setup,
1320 .flags = CON_PRINTBUFFER,
1321 .index = -1,
1322 };
1323
1324
1325 static int __init m68328_console_init(void)
1326 {
1327 register_console(&m68328_driver);
1328 return 0;
1329 }
1330
1331 console_initcall(m68328_console_init);
Linux kernel - Deliverables
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