This source file includes following definitions.
- serial_paranoia_check
- serial_in
- serial_inp
- serial_out
- serial_outp
- rs_stop
- rs_start
- rs_probe
- rs_sched_event
- receive_chars
- transmit_chars
- check_modem_status
- rs_interrupt
- rs_interrupt_single
- rs_interrupt
- rs_interrupt_single
- do_serial_bh
- do_softint
- rs_timer
- grab_all_interrupts
- free_all_interrupts
- figure_IRQ_timeout
- startup
- shutdown
- change_speed
- rs_put_char
- rs_flush_chars
- rs_write
- rs_write_room
- rs_chars_in_buffer
- rs_flush_buffer
- rs_throttle
- rs_unthrottle
- get_serial_info
- set_serial_info
- get_lsr_info
- get_modem_info
- set_modem_info
- do_autoconfig
- send_break
- check_wild_interrupts
- rs_ioctl
- rs_set_termios
- rs_close
- rs_hangup
- block_til_ready
- rs_open
- show_serial_version
- get_auto_irq
- do_auto_irq
- autoconfig
- rs_init
- register_serial
- unregister_serial
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20 #include <linux/errno.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/serial.h>
28 #include <linux/serial_reg.h>
29 #include <linux/config.h>
30 #include <linux/major.h>
31 #include <linux/string.h>
32 #include <linux/fcntl.h>
33 #include <linux/ptrace.h>
34 #include <linux/major.h>
35
36 #include <asm/system.h>
37 #include <asm/io.h>
38 #include <asm/segment.h>
39 #include <asm/bitops.h>
40
41 DECLARE_TASK_QUEUE(tq_serial);
42
43 struct tty_driver serial_driver, callout_driver;
44 static int serial_refcount;
45
46
47 #define SERIAL_TYPE_NORMAL 1
48 #define SERIAL_TYPE_CALLOUT 2
49
50
51 #define WAKEUP_CHARS 256
52
53
54
55
56
57
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60
61
62
63
64
65 #define SERIAL_PARANOIA_CHECK
66 #define CONFIG_SERIAL_NOPAUSE_IO
67 #define SERIAL_DO_RESTART
68 #define CONFIG_SERIAL_NEW_ISR
69
70 #undef SERIAL_DEBUG_INTR
71 #undef SERIAL_DEBUG_OPEN
72 #undef SERIAL_DEBUG_FLOW
73
74 #define _INLINE_ inline
75
76
77
78
79
80
81 static struct async_struct *IRQ_ports[16];
82 static int IRQ_timeout[16];
83 static volatile int rs_irq_triggered;
84 static volatile int rs_triggered;
85 static int rs_wild_int_mask;
86
87 static void autoconfig(struct async_struct * info);
88 static void change_speed(struct async_struct *info);
89
90
91
92
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94
95
96
97 #define BASE_BAUD ( 1843200 / 16 )
98
99
100 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST )
101 #define STD_COM4_FLAGS ASYNC_BOOT_AUTOCONF
102
103 #define FOURPORT_FLAGS ASYNC_FOURPORT
104 #define ACCENT_FLAGS 0
105 #define BOCA_FLAGS 0
106 #define HUB6_FLAGS 0
107
108
109
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111
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120
121
122 #define C_P(card,port) (((card)<<6|(port)<<3) + 1)
123
124 struct async_struct rs_table[] = {
125
126 { 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS },
127 { 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS },
128 { 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS },
129 { 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS },
130
131 { 0, BASE_BAUD, 0x1A0, 9, FOURPORT_FLAGS },
132 { 0, BASE_BAUD, 0x1A8, 9, FOURPORT_FLAGS },
133 { 0, BASE_BAUD, 0x1B0, 9, FOURPORT_FLAGS },
134 { 0, BASE_BAUD, 0x1B8, 9, FOURPORT_FLAGS },
135
136 { 0, BASE_BAUD, 0x2A0, 5, FOURPORT_FLAGS },
137 { 0, BASE_BAUD, 0x2A8, 5, FOURPORT_FLAGS },
138 { 0, BASE_BAUD, 0x2B0, 5, FOURPORT_FLAGS },
139 { 0, BASE_BAUD, 0x2B8, 5, FOURPORT_FLAGS },
140
141 { 0, BASE_BAUD, 0x330, 4, ACCENT_FLAGS },
142 { 0, BASE_BAUD, 0x338, 4, ACCENT_FLAGS },
143 { 0, BASE_BAUD, 0x000, 0, 0 },
144 { 0, BASE_BAUD, 0x000, 0, 0 },
145
146 { 0, BASE_BAUD, 0x100, 12, BOCA_FLAGS },
147 { 0, BASE_BAUD, 0x108, 12, BOCA_FLAGS },
148 { 0, BASE_BAUD, 0x110, 12, BOCA_FLAGS },
149 { 0, BASE_BAUD, 0x118, 12, BOCA_FLAGS },
150 { 0, BASE_BAUD, 0x120, 12, BOCA_FLAGS },
151 { 0, BASE_BAUD, 0x128, 12, BOCA_FLAGS },
152 { 0, BASE_BAUD, 0x130, 12, BOCA_FLAGS },
153 { 0, BASE_BAUD, 0x138, 12, BOCA_FLAGS },
154 { 0, BASE_BAUD, 0x140, 12, BOCA_FLAGS },
155 { 0, BASE_BAUD, 0x148, 12, BOCA_FLAGS },
156 { 0, BASE_BAUD, 0x150, 12, BOCA_FLAGS },
157 { 0, BASE_BAUD, 0x158, 12, BOCA_FLAGS },
158 { 0, BASE_BAUD, 0x160, 12, BOCA_FLAGS },
159 { 0, BASE_BAUD, 0x168, 12, BOCA_FLAGS },
160 { 0, BASE_BAUD, 0x170, 12, BOCA_FLAGS },
161 { 0, BASE_BAUD, 0x178, 12, BOCA_FLAGS },
162
163
164
165
166 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,0) },
167 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,1) },
168 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,2) },
169 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,3) },
170 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,4) },
171 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,5) },
172 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,0) },
173 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,1) },
174 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,2) },
175 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,3) },
176 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,4) },
177 { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,5) },
178 };
179
180 #define NR_PORTS (sizeof(rs_table)/sizeof(struct async_struct))
181
182 static struct tty_struct *serial_table[NR_PORTS];
183 static struct termios *serial_termios[NR_PORTS];
184 static struct termios *serial_termios_locked[NR_PORTS];
185
186 #ifndef MIN
187 #define MIN(a,b) ((a) < (b) ? (a) : (b))
188 #endif
189
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193
194
195
196
197
198
199 static unsigned char *tmp_buf = 0;
200 static struct semaphore tmp_buf_sem = MUTEX;
201
202 static inline int serial_paranoia_check(struct async_struct *info,
203 dev_t device, const char *routine)
204 {
205 #ifdef SERIAL_PARANOIA_CHECK
206 static const char *badmagic =
207 "Warning: bad magic number for serial struct (%d, %d) in %s\n";
208 static const char *badinfo =
209 "Warning: null async_struct for (%d, %d) in %s\n";
210
211 if (!info) {
212 printk(badinfo, MAJOR(device), MINOR(device), routine);
213 return 1;
214 }
215 if (info->magic != SERIAL_MAGIC) {
216 printk(badmagic, MAJOR(device), MINOR(device), routine);
217 return 1;
218 }
219 #endif
220 return 0;
221 }
222
223
224
225
226 static int baud_table[] = {
227 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
228 9600, 19200, 38400, 57600, 115200, 0 };
229
230 static inline unsigned int serial_in(struct async_struct *info, int offset)
231 {
232 #ifdef CONFIG_HUB6
233 if (info->hub6) {
234 outb(info->hub6 - 1 + offset, info->port);
235 return inb(info->port+1);
236 } else
237 #endif
238 return inb(info->port + offset);
239 }
240
241 static inline unsigned int serial_inp(struct async_struct *info, int offset)
242 {
243 #ifdef CONFIG_HUB6
244 if (info->hub6) {
245 outb(info->hub6 - 1 + offset, info->port);
246 return inb_p(info->port+1);
247 } else
248 #endif
249 #ifdef CONFIG_SERIAL_NOPAUSE_IO
250 return inb(info->port + offset);
251 #else
252 return inb_p(info->port + offset);
253 #endif
254 }
255
256 static inline void serial_out(struct async_struct *info, int offset, int value)
257 {
258 #ifdef CONFIG_HUB6
259 if (info->hub6) {
260 outb(info->hub6 - 1 + offset, info->port);
261 outb(value, info->port+1);
262 } else
263 #endif
264 outb(value, info->port+offset);
265 }
266
267 static inline void serial_outp(struct async_struct *info, int offset,
268 int value)
269 {
270 #ifdef CONFIG_HUB6
271 if (info->hub6) {
272 outb(info->hub6 - 1 + offset, info->port);
273 outb_p(value, info->port+1);
274 } else
275 #endif
276 #ifdef CONFIG_SERIAL_NOPAUSE_IO
277 outb(value, info->port+offset);
278 #else
279 outb_p(value, info->port+offset);
280 #endif
281 }
282
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289
290
291 static void rs_stop(struct tty_struct *tty)
292 {
293 struct async_struct *info = (struct async_struct *)tty->driver_data;
294 unsigned long flags;
295
296 if (serial_paranoia_check(info, tty->device, "rs_stop"))
297 return;
298
299 save_flags(flags); cli();
300 if (info->IER & UART_IER_THRI) {
301 info->IER &= ~UART_IER_THRI;
302 serial_out(info, UART_IER, info->IER);
303 }
304 restore_flags(flags);
305 }
306
307 static void rs_start(struct tty_struct *tty)
308 {
309 struct async_struct *info = (struct async_struct *)tty->driver_data;
310 unsigned long flags;
311
312 if (serial_paranoia_check(info, tty->device, "rs_start"))
313 return;
314
315 save_flags(flags); cli();
316 if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
317 info->IER |= UART_IER_THRI;
318 serial_out(info, UART_IER, info->IER);
319 }
320 restore_flags(flags);
321 }
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347
348 static void rs_probe(int irq)
349 {
350 rs_irq_triggered = irq;
351 rs_triggered |= 1 << irq;
352 return;
353 }
354
355
356
357
358
359 static _INLINE_ void rs_sched_event(struct async_struct *info,
360 int event)
361 {
362 info->event |= 1 << event;
363 queue_task_irq_off(&info->tqueue, &tq_serial);
364 mark_bh(SERIAL_BH);
365 }
366
367 static _INLINE_ void receive_chars(struct async_struct *info,
368 int *status)
369 {
370 struct tty_struct *tty = info->tty;
371 unsigned char ch;
372
373 do {
374 ch = serial_inp(info, UART_RX);
375 if (*status & info->ignore_status_mask)
376 goto ignore_char;
377 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
378 break;
379 tty->flip.count++;
380 if (*status & (UART_LSR_BI)) {
381 printk("handling break....");
382 *tty->flip.flag_buf_ptr++ = TTY_BREAK;
383 if (info->flags & ASYNC_SAK)
384 do_SAK(tty);
385 } else if (*status & UART_LSR_PE)
386 *tty->flip.flag_buf_ptr++ = TTY_PARITY;
387 else if (*status & UART_LSR_FE)
388 *tty->flip.flag_buf_ptr++ = TTY_FRAME;
389 else if (*status & UART_LSR_OE)
390 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
391 else
392 *tty->flip.flag_buf_ptr++ = 0;
393 *tty->flip.char_buf_ptr++ = ch;
394 ignore_char:
395 *status = serial_inp(info, UART_LSR) & info->read_status_mask;
396 } while (*status & UART_LSR_DR);
397 queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
398 #ifdef SERIAL_DEBUG_INTR
399 printk("DR...");
400 #endif
401 }
402
403 static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
404 {
405 int count;
406
407 if (info->x_char) {
408 serial_outp(info, UART_TX, info->x_char);
409 info->x_char = 0;
410 if (intr_done)
411 *intr_done = 0;
412 return;
413 }
414 if ((info->xmit_cnt <= 0) || info->tty->stopped ||
415 info->tty->hw_stopped) {
416 info->IER &= ~UART_IER_THRI;
417 #ifdef CONFIG_SERIAL_NEW_ISR
418 serial_out(info, UART_IER, info->IER);
419 #endif
420 return;
421 }
422
423 count = info->xmit_fifo_size;
424 do {
425 serial_out(info, UART_TX, info->xmit_buf[info->xmit_tail++]);
426 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
427 if (--info->xmit_cnt <= 0)
428 break;
429 } while (--count > 0);
430
431 if (info->xmit_cnt < WAKEUP_CHARS)
432 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
433
434 #ifdef SERIAL_DEBUG_INTR
435 printk("THRE...");
436 #endif
437 if (intr_done)
438 *intr_done = 0;
439
440 if (info->xmit_cnt <= 0) {
441 info->IER &= ~UART_IER_THRI;
442 #ifdef CONFIG_SERIAL_NEW_ISR
443 serial_out(info, UART_IER, info->IER);
444 #endif
445 }
446 }
447
448 static _INLINE_ void check_modem_status(struct async_struct *info)
449 {
450 int status;
451
452 status = serial_in(info, UART_MSR);
453
454 if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
455 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
456 printk("ttys%d CD now %s...", info->line,
457 (status & UART_MSR_DCD) ? "on" : "off");
458 #endif
459 if (status & UART_MSR_DCD)
460 wake_up_interruptible(&info->open_wait);
461 else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
462 (info->flags & ASYNC_CALLOUT_NOHUP))) {
463 #ifdef SERIAL_DEBUG_OPEN
464 printk("scheduling hangup...");
465 #endif
466 rs_sched_event(info, RS_EVENT_HANGUP);
467 }
468 }
469 if (info->flags & ASYNC_CTS_FLOW) {
470 if (info->tty->hw_stopped) {
471 if (status & UART_MSR_CTS) {
472 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
473 printk("CTS tx start...");
474 #endif
475 info->tty->hw_stopped = 0;
476 info->IER |= UART_IER_THRI;
477 #ifdef CONFIG_SERIAL_NEW_ISR
478 serial_out(info, UART_IER, info->IER);
479 #endif
480 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
481 return;
482 }
483 } else {
484 if (!(status & UART_MSR_CTS)) {
485 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
486 printk("CTS tx stop...");
487 #endif
488 info->tty->hw_stopped = 1;
489 info->IER &= ~UART_IER_THRI;
490 #ifdef CONFIG_SERIAL_NEW_ISR
491 serial_out(info, UART_IER, info->IER);
492 #endif
493 }
494 }
495 }
496 }
497
498 #ifdef CONFIG_SERIAL_NEW_ISR
499
500
501
502 static void rs_interrupt(int irq)
503 {
504 int status;
505 struct async_struct * info;
506 int pass_counter = 0;
507 struct async_struct *end_mark = 0;
508
509 #ifdef SERIAL_DEBUG_INTR
510 printk("rs_interrupt(%d)...", irq);
511 #endif
512
513 info = IRQ_ports[irq];
514 if (!info)
515 return;
516
517 do {
518 if (!info->tty ||
519 (serial_in(info, UART_IIR) & UART_IIR_NO_INT)) {
520 if (!end_mark)
521 end_mark = info;
522 goto next;
523 }
524 end_mark = 0;
525
526 info->last_active = jiffies;
527
528 status = serial_inp(info, UART_LSR) & info->read_status_mask;
529 #ifdef SERIAL_DEBUG_INTR
530 printk("status = %x...", status);
531 #endif
532 if (status & UART_LSR_DR)
533 receive_chars(info, &status);
534 check_modem_status(info);
535 if (status & UART_LSR_THRE)
536 transmit_chars(info, 0);
537
538 next:
539 info = info->next_port;
540 if (!info) {
541 info = IRQ_ports[irq];
542 if (pass_counter++ > 64) {
543 #if 0
544 printk("rs loop break\n");
545 #endif
546 break;
547 }
548 continue;
549 }
550 } while (end_mark != info);
551 #ifdef SERIAL_DEBUG_INTR
552 printk("end.\n");
553 #endif
554 }
555
556
557
558
559 static void rs_interrupt_single(int irq)
560 {
561 int status;
562 int pass_counter = 0;
563 struct async_struct * info;
564
565 #ifdef SERIAL_DEBUG_INTR
566 printk("rs_interrupt_single(%d)...", irq);
567 #endif
568
569 info = IRQ_ports[irq];
570 if (!info || !info->tty)
571 return;
572
573 do {
574 status = serial_inp(info, UART_LSR) & info->read_status_mask;
575 #ifdef SERIAL_DEBUG_INTR
576 printk("status = %x...", status);
577 #endif
578 if (status & UART_LSR_DR)
579 receive_chars(info, &status);
580 check_modem_status(info);
581 if (status & UART_LSR_THRE)
582 transmit_chars(info, 0);
583 if (pass_counter++ > 64) {
584 #if 0
585 printk("rs_single loop break.\n");
586 #endif
587 break;
588 }
589 } while (!(serial_in(info, UART_IIR) & UART_IIR_NO_INT));
590 info->last_active = jiffies;
591 #ifdef SERIAL_DEBUG_INTR
592 printk("end.\n");
593 #endif
594 }
595
596 #else
597
598
599
600
601 static void rs_interrupt(int irq)
602 {
603 int status;
604 struct async_struct * info;
605 int done = 1, pass_counter = 0;
606
607
608 #ifdef SERIAL_DEBUG_INTR
609 printk("rs_interrupt(%d)...", irq);
610 #endif
611
612 info = IRQ_ports[irq];
613 if (!info)
614 return;
615
616 while (1) {
617 if (!info->tty)
618 goto next;
619
620 serial_outp(info, UART_IER, 0);
621 status = serial_inp(info, UART_LSR) & info->read_status_mask;
622 if (status & UART_LSR_DR) {
623 receive_chars(info, &status);
624 done = 0;
625 }
626 check_modem_status(info);
627 if (status & UART_LSR_THRE)
628 transmit_chars(info, &done);
629
630 next:
631 info = info->next_port;
632 if (!info) {
633 info = IRQ_ports[irq];
634 if (done)
635 break;
636 done = 1;
637 if (pass_counter++ > 64) {
638 #if 0
639 printk("rs loop break\n");
640 #endif
641 break;
642 }
643 }
644 }
645
646
647
648
649
650 do
651 serial_outp(info, UART_IER, info->IER);
652 while ((info = info->next_port) != NULL);
653 }
654
655
656
657
658 static void rs_interrupt_single(int irq)
659 {
660 int status;
661 struct async_struct * info;
662
663
664 #ifdef SERIAL_DEBUG_INTR
665 printk("rs_interrupt_single(%d)...", irq);
666 #endif
667
668 info = IRQ_ports[irq];
669 if (!info || !info->tty)
670 return;
671
672 serial_outp(info, UART_IER, 0);
673 status = serial_inp(info, UART_LSR) & info->read_status_mask;
674 if (status & UART_LSR_DR)
675 receive_chars(info, &status);
676 check_modem_status(info);
677 if (status & UART_LSR_THRE)
678 transmit_chars(info, 0);
679
680
681
682
683 serial_outp(info, UART_IER, info->IER);
684 }
685
686 #endif
687
688
689
690
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693
694
695
696
697
698
699
700
701
702
703 static void do_serial_bh(void *unused)
704 {
705 run_task_queue(&tq_serial);
706 }
707
708 static void do_softint(void *private_)
709 {
710 struct async_struct *info = (struct async_struct *) private_;
711 struct tty_struct *tty;
712
713 tty = info->tty;
714 if (!tty)
715 return;
716
717 if (clear_bit(RS_EVENT_HANGUP, &info->event)) {
718 tty_hangup(tty);
719 wake_up_interruptible(&info->open_wait);
720 info->flags &= ~(ASYNC_NORMAL_ACTIVE|
721 ASYNC_CALLOUT_ACTIVE);
722 }
723 if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
724 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
725 tty->ldisc.write_wakeup)
726 (tty->ldisc.write_wakeup)(tty);
727 wake_up_interruptible(&tty->write_wait);
728 }
729 }
730
731
732
733
734
735
736
737
738 static void rs_timer(void)
739 {
740 static unsigned long last_strobe = 0;
741 struct async_struct *info;
742 unsigned int i;
743
744 if ((jiffies - last_strobe) >= 60*HZ) {
745 for (i=1; i < 16; i++) {
746 info = IRQ_ports[i];
747 if (!info)
748 continue;
749 cli();
750 if (info->next_port) {
751 do {
752 serial_out(info, UART_IER, 0);
753 info->IER |= UART_IER_THRI;
754 serial_out(info, UART_IER, info->IER);
755 info = info->next_port;
756 } while (info);
757 rs_interrupt(i);
758 } else
759 rs_interrupt_single(i);
760 sti();
761 }
762 }
763 last_strobe = jiffies;
764 timer_table[RS_TIMER].expires = jiffies + 60 * HZ;
765 timer_active |= 1 << RS_TIMER;
766
767 if (IRQ_ports[0]) {
768 cli();
769 rs_interrupt(0);
770 sti();
771
772 timer_table[RS_TIMER].expires = jiffies + IRQ_timeout[0] - 2;
773 }
774 }
775
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789
790
791 static int grab_all_interrupts(int dontgrab)
792 {
793 int irq_lines = 0;
794 int i, mask;
795
796 for (i = 0, mask = 1; i < 16; i++, mask <<= 1) {
797 if (!(mask & dontgrab) && !request_irq(i, rs_probe, SA_INTERRUPT, "serial probe")) {
798 irq_lines |= mask;
799 }
800 }
801 return irq_lines;
802 }
803
804
805
806
807 static void free_all_interrupts(int irq_lines)
808 {
809 int i;
810
811 for (i = 0; i < 16; i++) {
812 if (irq_lines & (1 << i))
813 free_irq(i);
814 }
815 }
816
817
818
819
820
821
822 static void figure_IRQ_timeout(int irq)
823 {
824 struct async_struct *info;
825 int timeout = 6000;
826
827 info = IRQ_ports[irq];
828 if (!info) {
829 IRQ_timeout[irq] = 6000;
830 return;
831 }
832 while (info) {
833 if (info->timeout < timeout)
834 timeout = info->timeout;
835 info = info->next_port;
836 }
837 if (!irq)
838 timeout = timeout / 2;
839 IRQ_timeout[irq] = timeout ? timeout : 1;
840 }
841
842 static int startup(struct async_struct * info)
843 {
844 unsigned short ICP;
845 unsigned long flags;
846 int retval;
847 void (*handler)(int);
848
849 if (info->flags & ASYNC_INITIALIZED)
850 return 0;
851
852 if (!info->port || !info->type) {
853 if (info->tty)
854 set_bit(TTY_IO_ERROR, &info->tty->flags);
855 return 0;
856 }
857
858 if (!info->xmit_buf) {
859 info->xmit_buf = (unsigned char *) get_free_page(GFP_KERNEL);
860 if (!info->xmit_buf)
861 return -ENOMEM;
862 }
863
864 save_flags(flags); cli();
865
866 #ifdef SERIAL_DEBUG_OPEN
867 printk("starting up ttys%d (irq %d)...", info->line, info->irq);
868 #endif
869
870
871
872
873
874 if (info->type == PORT_16550A) {
875 serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
876 UART_FCR_CLEAR_XMIT));
877 info->xmit_fifo_size = 16;
878 } else
879 info->xmit_fifo_size = 1;
880
881
882
883
884
885
886 if (serial_inp(info, UART_LSR) == 0xff) {
887 restore_flags(flags);
888 if (suser()) {
889 if (info->tty)
890 set_bit(TTY_IO_ERROR, &info->tty->flags);
891 return 0;
892 } else
893 return -ENODEV;
894 }
895
896
897
898
899 if (info->irq && (!IRQ_ports[info->irq] ||
900 !IRQ_ports[info->irq]->next_port)) {
901 if (IRQ_ports[info->irq]) {
902 free_irq(info->irq);
903 handler = rs_interrupt;
904 } else
905 handler = rs_interrupt_single;
906
907 retval = request_irq(info->irq, handler, SA_INTERRUPT, "serial");
908 if (retval) {
909 restore_flags(flags);
910 if (suser()) {
911 if (info->tty)
912 set_bit(TTY_IO_ERROR,
913 &info->tty->flags);
914 return 0;
915 } else
916 return retval;
917 }
918 }
919
920
921
922
923
924 (void) serial_inp(info, UART_RX);
925 (void) serial_inp(info, UART_IIR);
926 (void) serial_inp(info, UART_MSR);
927
928
929
930
931 serial_outp(info, UART_LCR, UART_LCR_WLEN8);
932 if (info->flags & ASYNC_FOURPORT) {
933 info->MCR = UART_MCR_DTR | UART_MCR_RTS;
934 info->MCR_noint = UART_MCR_DTR | UART_MCR_OUT1;
935 } else {
936 info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
937 info->MCR_noint = UART_MCR_DTR | UART_MCR_RTS;
938 }
939 if (info->irq == 0)
940 info->MCR = info->MCR_noint;
941 serial_outp(info, UART_MCR, info->MCR);
942
943
944
945
946 info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
947 serial_outp(info, UART_IER, info->IER);
948
949 if (info->flags & ASYNC_FOURPORT) {
950
951 ICP = (info->port & 0xFE0) | 0x01F;
952 outb_p(0x80, ICP);
953 (void) inb_p(ICP);
954 }
955
956
957
958
959 (void)serial_inp(info, UART_LSR);
960 (void)serial_inp(info, UART_RX);
961 (void)serial_inp(info, UART_IIR);
962 (void)serial_inp(info, UART_MSR);
963
964 if (info->tty)
965 clear_bit(TTY_IO_ERROR, &info->tty->flags);
966 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
967
968
969
970
971 info->prev_port = 0;
972 info->next_port = IRQ_ports[info->irq];
973 if (info->next_port)
974 info->next_port->prev_port = info;
975 IRQ_ports[info->irq] = info;
976 figure_IRQ_timeout(info->irq);
977
978
979
980
981 timer_table[RS_TIMER].expires = jiffies + 2;
982 timer_active |= 1 << RS_TIMER;
983
984
985
986
987 change_speed(info);
988
989 info->flags |= ASYNC_INITIALIZED;
990 restore_flags(flags);
991 return 0;
992 }
993
994
995
996
997
998 static void shutdown(struct async_struct * info)
999 {
1000 unsigned long flags;
1001 int retval;
1002
1003 if (!(info->flags & ASYNC_INITIALIZED))
1004 return;
1005
1006 #ifdef SERIAL_DEBUG_OPEN
1007 printk("Shutting down serial port %d (irq %d)....", info->line,
1008 info->irq);
1009 #endif
1010
1011 save_flags(flags); cli();
1012
1013
1014
1015
1016 if (info->next_port)
1017 info->next_port->prev_port = info->prev_port;
1018 if (info->prev_port)
1019 info->prev_port->next_port = info->next_port;
1020 else
1021 IRQ_ports[info->irq] = info->next_port;
1022 figure_IRQ_timeout(info->irq);
1023
1024
1025
1026
1027 if (info->irq && (!IRQ_ports[info->irq] ||
1028 !IRQ_ports[info->irq]->next_port)) {
1029 if (IRQ_ports[info->irq]) {
1030 free_irq(info->irq);
1031 retval = request_irq(info->irq, rs_interrupt_single, SA_INTERRUPT, "serial");
1032
1033 if (retval)
1034 printk("serial shutdown: request_irq: error %d"
1035 " Couldn't reacquire IRQ.\n", retval);
1036 } else
1037 free_irq(info->irq);
1038 }
1039
1040 if (info->xmit_buf) {
1041 free_page((unsigned long) info->xmit_buf);
1042 info->xmit_buf = 0;
1043 }
1044
1045 info->IER = 0;
1046 serial_outp(info, UART_IER, 0x00);
1047 if (info->flags & ASYNC_FOURPORT) {
1048
1049 (void) inb((info->port & 0xFE0) | 0x01F);
1050 }
1051
1052 if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
1053 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1054 info->MCR_noint &= ~(UART_MCR_DTR|UART_MCR_RTS);
1055 }
1056 serial_outp(info, UART_MCR, info->MCR_noint);
1057
1058
1059 serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
1060 UART_FCR_CLEAR_XMIT));
1061 (void)serial_in(info, UART_RX);
1062
1063 if (info->tty)
1064 set_bit(TTY_IO_ERROR, &info->tty->flags);
1065
1066 info->flags &= ~ASYNC_INITIALIZED;
1067 restore_flags(flags);
1068 }
1069
1070
1071
1072
1073
1074 static void change_speed(struct async_struct *info)
1075 {
1076 unsigned short port;
1077 int quot = 0;
1078 unsigned cflag,cval,fcr;
1079 int i;
1080
1081 if (!info->tty || !info->tty->termios)
1082 return;
1083 cflag = info->tty->termios->c_cflag;
1084 if (!(port = info->port))
1085 return;
1086 i = cflag & CBAUD;
1087 if (i == 15) {
1088 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1089 i += 1;
1090 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1091 i += 2;
1092 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
1093 quot = info->custom_divisor;
1094 }
1095 if (quot) {
1096 info->timeout = ((info->xmit_fifo_size*HZ*15*quot) /
1097 info->baud_base) + 2;
1098 } else if (baud_table[i] == 134) {
1099 quot = (2*info->baud_base / 269);
1100 info->timeout = (info->xmit_fifo_size*HZ*30/269) + 2;
1101 } else if (baud_table[i]) {
1102 quot = info->baud_base / baud_table[i];
1103 info->timeout = (info->xmit_fifo_size*HZ*15/baud_table[i]) + 2;
1104 } else {
1105 quot = 0;
1106 info->timeout = 0;
1107 }
1108 if (quot) {
1109 info->MCR |= UART_MCR_DTR;
1110 info->MCR_noint |= UART_MCR_DTR;
1111 cli();
1112 serial_out(info, UART_MCR, info->MCR);
1113 sti();
1114 } else {
1115 info->MCR &= ~UART_MCR_DTR;
1116 info->MCR_noint &= ~UART_MCR_DTR;
1117 cli();
1118 serial_out(info, UART_MCR, info->MCR);
1119 sti();
1120 return;
1121 }
1122
1123 cval = cflag & (CSIZE | CSTOPB);
1124 cval >>= 4;
1125 if (cflag & PARENB)
1126 cval |= UART_LCR_PARITY;
1127 if (!(cflag & PARODD))
1128 cval |= UART_LCR_EPAR;
1129 if (info->type == PORT_16550A) {
1130 if ((info->baud_base / quot) < 2400)
1131 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
1132 else
1133 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
1134 } else
1135 fcr = 0;
1136
1137
1138 info->IER &= ~UART_IER_MSI;
1139 if (cflag & CRTSCTS) {
1140 info->flags |= ASYNC_CTS_FLOW;
1141 info->IER |= UART_IER_MSI;
1142 } else
1143 info->flags &= ~ASYNC_CTS_FLOW;
1144 if (cflag & CLOCAL)
1145 info->flags &= ~ASYNC_CHECK_CD;
1146 else {
1147 info->flags |= ASYNC_CHECK_CD;
1148 info->IER |= UART_IER_MSI;
1149 }
1150 serial_out(info, UART_IER, info->IER);
1151
1152
1153
1154
1155 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
1156 if (I_INPCK(info->tty))
1157 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
1158 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
1159 info->read_status_mask |= UART_LSR_BI;
1160
1161 info->ignore_status_mask = 0;
1162 if (I_IGNPAR(info->tty)) {
1163 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
1164 info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
1165 }
1166 if (I_IGNBRK(info->tty)) {
1167 info->ignore_status_mask |= UART_LSR_BI;
1168 info->read_status_mask |= UART_LSR_BI;
1169
1170
1171
1172
1173 if (I_IGNPAR(info->tty)) {
1174 info->ignore_status_mask |= UART_LSR_OE;
1175 info->read_status_mask |= UART_LSR_OE;
1176 }
1177 }
1178
1179 cli();
1180 serial_outp(info, UART_LCR, cval | UART_LCR_DLAB);
1181 serial_outp(info, UART_DLL, quot & 0xff);
1182 serial_outp(info, UART_DLM, quot >> 8);
1183 serial_outp(info, UART_LCR, cval);
1184 serial_outp(info, UART_FCR, fcr);
1185 sti();
1186 }
1187
1188 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
1189 {
1190 struct async_struct *info = (struct async_struct *)tty->driver_data;
1191 unsigned long flags;
1192
1193 if (serial_paranoia_check(info, tty->device, "rs_put_char"))
1194 return;
1195
1196 if (!tty || !info->xmit_buf)
1197 return;
1198
1199 save_flags(flags); cli();
1200 if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
1201 restore_flags(flags);
1202 return;
1203 }
1204
1205 info->xmit_buf[info->xmit_head++] = ch;
1206 info->xmit_head &= SERIAL_XMIT_SIZE-1;
1207 info->xmit_cnt++;
1208 restore_flags(flags);
1209 }
1210
1211 static void rs_flush_chars(struct tty_struct *tty)
1212 {
1213 struct async_struct *info = (struct async_struct *)tty->driver_data;
1214 unsigned long flags;
1215
1216 if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
1217 return;
1218
1219 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
1220 !info->xmit_buf)
1221 return;
1222
1223 save_flags(flags); cli();
1224 info->IER |= UART_IER_THRI;
1225 serial_out(info, UART_IER, info->IER);
1226 restore_flags(flags);
1227 }
1228
1229 static int rs_write(struct tty_struct * tty, int from_user,
1230 unsigned char *buf, int count)
1231 {
1232 int c, total = 0;
1233 struct async_struct *info = (struct async_struct *)tty->driver_data;
1234 unsigned long flags;
1235
1236 if (serial_paranoia_check(info, tty->device, "rs_write"))
1237 return 0;
1238
1239 if (!tty || !info->xmit_buf || !tmp_buf)
1240 return 0;
1241
1242 save_flags(flags);
1243 while (1) {
1244 cli();
1245 c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1246 SERIAL_XMIT_SIZE - info->xmit_head));
1247 if (c <= 0)
1248 break;
1249
1250 if (from_user) {
1251 down(&tmp_buf_sem);
1252 memcpy_fromfs(tmp_buf, buf, c);
1253 c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1254 SERIAL_XMIT_SIZE - info->xmit_head));
1255 memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
1256 up(&tmp_buf_sem);
1257 } else
1258 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1259 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
1260 info->xmit_cnt += c;
1261 restore_flags(flags);
1262 buf += c;
1263 count -= c;
1264 total += c;
1265 }
1266 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1267 !(info->IER & UART_IER_THRI)) {
1268 info->IER |= UART_IER_THRI;
1269 serial_out(info, UART_IER, info->IER);
1270 }
1271 restore_flags(flags);
1272 return total;
1273 }
1274
1275 static int rs_write_room(struct tty_struct *tty)
1276 {
1277 struct async_struct *info = (struct async_struct *)tty->driver_data;
1278 int ret;
1279
1280 if (serial_paranoia_check(info, tty->device, "rs_write_room"))
1281 return 0;
1282 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1283 if (ret < 0)
1284 ret = 0;
1285 return ret;
1286 }
1287
1288 static int rs_chars_in_buffer(struct tty_struct *tty)
1289 {
1290 struct async_struct *info = (struct async_struct *)tty->driver_data;
1291
1292 if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
1293 return 0;
1294 return info->xmit_cnt;
1295 }
1296
1297 static void rs_flush_buffer(struct tty_struct *tty)
1298 {
1299 struct async_struct *info = (struct async_struct *)tty->driver_data;
1300
1301 if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
1302 return;
1303 cli();
1304 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1305 sti();
1306 wake_up_interruptible(&tty->write_wait);
1307 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
1308 tty->ldisc.write_wakeup)
1309 (tty->ldisc.write_wakeup)(tty);
1310 }
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320 static void rs_throttle(struct tty_struct * tty)
1321 {
1322 struct async_struct *info = (struct async_struct *)tty->driver_data;
1323 #ifdef SERIAL_DEBUG_THROTTLE
1324 char buf[64];
1325
1326 printk("throttle %s: %d....\n", _tty_name(tty, buf),
1327 tty->ldisc.chars_in_buffer(tty));
1328 #endif
1329
1330 if (serial_paranoia_check(info, tty->device, "rs_throttle"))
1331 return;
1332
1333 if (I_IXOFF(tty))
1334 info->x_char = STOP_CHAR(tty);
1335
1336 info->MCR &= ~UART_MCR_RTS;
1337 info->MCR_noint &= ~UART_MCR_RTS;
1338 cli();
1339 serial_out(info, UART_MCR, info->MCR);
1340 sti();
1341 }
1342
1343 static void rs_unthrottle(struct tty_struct * tty)
1344 {
1345 struct async_struct *info = (struct async_struct *)tty->driver_data;
1346 #ifdef SERIAL_DEBUG_THROTTLE
1347 char buf[64];
1348
1349 printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
1350 tty->ldisc.chars_in_buffer(tty));
1351 #endif
1352
1353 if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
1354 return;
1355
1356 if (I_IXOFF(tty)) {
1357 if (info->x_char)
1358 info->x_char = 0;
1359 else
1360 info->x_char = START_CHAR(tty);
1361 }
1362 info->MCR |= UART_MCR_RTS;
1363 info->MCR_noint |= UART_MCR_RTS;
1364 cli();
1365 serial_out(info, UART_MCR, info->MCR);
1366 sti();
1367 }
1368
1369
1370
1371
1372
1373
1374
1375 static int get_serial_info(struct async_struct * info,
1376 struct serial_struct * retinfo)
1377 {
1378 struct serial_struct tmp;
1379
1380 if (!retinfo)
1381 return -EFAULT;
1382 memset(&tmp, 0, sizeof(tmp));
1383 tmp.type = info->type;
1384 tmp.line = info->line;
1385 tmp.port = info->port;
1386 tmp.irq = info->irq;
1387 tmp.flags = info->flags;
1388 tmp.baud_base = info->baud_base;
1389 tmp.close_delay = info->close_delay;
1390 tmp.custom_divisor = info->custom_divisor;
1391 tmp.hub6 = info->hub6;
1392 memcpy_tofs(retinfo,&tmp,sizeof(*retinfo));
1393 return 0;
1394 }
1395
1396 static int set_serial_info(struct async_struct * info,
1397 struct serial_struct * new_info)
1398 {
1399 struct serial_struct new_serial;
1400 struct async_struct old_info;
1401 unsigned int i,change_irq,change_port;
1402 int retval = 0;
1403
1404 if (!new_info)
1405 return -EFAULT;
1406 memcpy_fromfs(&new_serial,new_info,sizeof(new_serial));
1407 old_info = *info;
1408
1409 change_irq = new_serial.irq != info->irq;
1410 change_port = (new_serial.port != info->port) || (new_serial.hub6 != info->hub6);
1411
1412 if (!suser()) {
1413 if (change_irq || change_port ||
1414 (new_serial.baud_base != info->baud_base) ||
1415 (new_serial.type != info->type) ||
1416 (new_serial.close_delay != info->close_delay) ||
1417 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1418 (info->flags & ~ASYNC_USR_MASK)))
1419 return -EPERM;
1420 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1421 (new_serial.flags & ASYNC_USR_MASK));
1422 info->custom_divisor = new_serial.custom_divisor;
1423 goto check_and_exit;
1424 }
1425
1426 if (new_serial.irq == 2)
1427 new_serial.irq = 9;
1428
1429 if ((new_serial.irq > 15) || (new_serial.port > 0xffff) ||
1430 (new_serial.type < PORT_UNKNOWN) || (new_serial.type > PORT_MAX)) {
1431 return -EINVAL;
1432 }
1433
1434
1435 if (new_serial.type) {
1436 for (i = 0 ; i < NR_PORTS; i++)
1437 if ((info != &rs_table[i]) &&
1438 (rs_table[i].port == new_serial.port) &&
1439 rs_table[i].type)
1440 return -EADDRINUSE;
1441 }
1442
1443 if ((change_port || change_irq) && (info->count > 1))
1444 return -EBUSY;
1445
1446
1447
1448
1449
1450
1451 info->baud_base = new_serial.baud_base;
1452 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1453 (new_serial.flags & ASYNC_FLAGS));
1454 info->custom_divisor = new_serial.custom_divisor;
1455 info->type = new_serial.type;
1456 info->close_delay = new_serial.close_delay;
1457
1458 if (change_port || change_irq) {
1459
1460
1461
1462
1463 shutdown(info);
1464 info->irq = new_serial.irq;
1465 info->port = new_serial.port;
1466 info->hub6 = new_serial.hub6;
1467 }
1468
1469 check_and_exit:
1470 if (!info->port || !info->type)
1471 return 0;
1472 if (info->flags & ASYNC_INITIALIZED) {
1473 if (((old_info.flags & ASYNC_SPD_MASK) !=
1474 (info->flags & ASYNC_SPD_MASK)) ||
1475 (old_info.custom_divisor != info->custom_divisor))
1476 change_speed(info);
1477 } else
1478 retval = startup(info);
1479 return retval;
1480 }
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493 static int get_lsr_info(struct async_struct * info, unsigned int *value)
1494 {
1495 unsigned char status;
1496 unsigned int result;
1497
1498 cli();
1499 status = serial_in(info, UART_LSR);
1500 sti();
1501 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1502 put_fs_long(result,(unsigned long *) value);
1503 return 0;
1504 }
1505
1506
1507 static int get_modem_info(struct async_struct * info, unsigned int *value)
1508 {
1509 unsigned char control, status;
1510 unsigned int result;
1511
1512 control = info->MCR;
1513 cli();
1514 status = serial_in(info, UART_MSR);
1515 sti();
1516 result = ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1517 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1518 | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1519 | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1520 | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1521 | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1522 put_fs_long(result,(unsigned long *) value);
1523 return 0;
1524 }
1525
1526 static int set_modem_info(struct async_struct * info, unsigned int cmd,
1527 unsigned int *value)
1528 {
1529 unsigned int arg = get_fs_long((unsigned long *) value);
1530
1531 switch (cmd) {
1532 case TIOCMBIS:
1533 if (arg & TIOCM_RTS) {
1534 info->MCR |= UART_MCR_RTS;
1535 info->MCR_noint |= UART_MCR_RTS;
1536 }
1537 if (arg & TIOCM_DTR) {
1538 info->MCR |= UART_MCR_DTR;
1539 info->MCR_noint |= UART_MCR_DTR;
1540 }
1541 break;
1542 case TIOCMBIC:
1543 if (arg & TIOCM_RTS) {
1544 info->MCR &= ~UART_MCR_RTS;
1545 info->MCR_noint &= ~UART_MCR_RTS;
1546 }
1547 if (arg & TIOCM_DTR) {
1548 info->MCR &= ~UART_MCR_DTR;
1549 info->MCR_noint &= ~UART_MCR_DTR;
1550 }
1551 break;
1552 case TIOCMSET:
1553 info->MCR = ((info->MCR & ~(UART_MCR_RTS | UART_MCR_DTR))
1554 | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
1555 | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
1556 info->MCR_noint = ((info->MCR_noint
1557 & ~(UART_MCR_RTS | UART_MCR_DTR))
1558 | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
1559 | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
1560 break;
1561 default:
1562 return -EINVAL;
1563 }
1564 cli();
1565 serial_out(info, UART_MCR, info->MCR);
1566 sti();
1567 return 0;
1568 }
1569
1570 static int do_autoconfig(struct async_struct * info)
1571 {
1572 int retval;
1573
1574 if (!suser())
1575 return -EPERM;
1576
1577 if (info->count > 1)
1578 return -EBUSY;
1579
1580 shutdown(info);
1581
1582 cli();
1583 autoconfig(info);
1584 sti();
1585
1586 retval = startup(info);
1587 if (retval)
1588 return retval;
1589 return 0;
1590 }
1591
1592
1593
1594
1595
1596 static void send_break( struct async_struct * info, int duration)
1597 {
1598 if (!info->port)
1599 return;
1600 current->state = TASK_INTERRUPTIBLE;
1601 current->timeout = jiffies + duration;
1602 cli();
1603 serial_out(info, UART_LCR, serial_inp(info, UART_LCR) | UART_LCR_SBC);
1604 schedule();
1605 serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC);
1606 sti();
1607 }
1608
1609
1610
1611
1612
1613 static int check_wild_interrupts(int doprint)
1614 {
1615 int i, mask;
1616 int wild_interrupts = 0;
1617 int irq_lines;
1618 unsigned long timeout;
1619 unsigned long flags;
1620
1621
1622 save_flags(flags); sti();
1623
1624 irq_lines = grab_all_interrupts(0);
1625
1626
1627
1628
1629
1630 timeout = jiffies+10;
1631 while (timeout >= jiffies)
1632 ;
1633
1634 rs_triggered = 0;
1635
1636 timeout = jiffies+10;
1637 while (timeout >= jiffies)
1638 ;
1639
1640 for (i = 0, mask = 1; i < 16; i++, mask <<= 1) {
1641 if ((rs_triggered & (1 << i)) &&
1642 (irq_lines & (1 << i))) {
1643 wild_interrupts |= mask;
1644 if (doprint)
1645 printk("Wild interrupt? (IRQ %d)\n", i);
1646 }
1647 }
1648 free_all_interrupts(irq_lines);
1649 restore_flags(flags);
1650 return wild_interrupts;
1651 }
1652
1653 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1654 unsigned int cmd, unsigned long arg)
1655 {
1656 int error;
1657 struct async_struct * info = (struct async_struct *)tty->driver_data;
1658 int retval;
1659
1660 if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
1661 return -ENODEV;
1662
1663 switch (cmd) {
1664 case TCSBRK:
1665 retval = tty_check_change(tty);
1666 if (retval)
1667 return retval;
1668 wait_until_sent(tty, 0);
1669 if (!arg)
1670 send_break(info, HZ/4);
1671 return 0;
1672 case TCSBRKP:
1673 retval = tty_check_change(tty);
1674 if (retval)
1675 return retval;
1676 wait_until_sent(tty, 0);
1677 send_break(info, arg ? arg*(HZ/10) : HZ/4);
1678 return 0;
1679 case TIOCGSOFTCAR:
1680 error = verify_area(VERIFY_WRITE, (void *) arg,sizeof(long));
1681 if (error)
1682 return error;
1683 put_fs_long(C_CLOCAL(tty) ? 1 : 0,
1684 (unsigned long *) arg);
1685 return 0;
1686 case TIOCSSOFTCAR:
1687 arg = get_fs_long((unsigned long *) arg);
1688 tty->termios->c_cflag =
1689 ((tty->termios->c_cflag & ~CLOCAL) |
1690 (arg ? CLOCAL : 0));
1691 return 0;
1692 case TIOCMGET:
1693 error = verify_area(VERIFY_WRITE, (void *) arg,
1694 sizeof(unsigned int));
1695 if (error)
1696 return error;
1697 return get_modem_info(info, (unsigned int *) arg);
1698 case TIOCMBIS:
1699 case TIOCMBIC:
1700 case TIOCMSET:
1701 return set_modem_info(info, cmd, (unsigned int *) arg);
1702 case TIOCGSERIAL:
1703 error = verify_area(VERIFY_WRITE, (void *) arg,
1704 sizeof(struct serial_struct));
1705 if (error)
1706 return error;
1707 return get_serial_info(info,
1708 (struct serial_struct *) arg);
1709 case TIOCSSERIAL:
1710 return set_serial_info(info,
1711 (struct serial_struct *) arg);
1712 case TIOCSERCONFIG:
1713 return do_autoconfig(info);
1714
1715 case TIOCSERGWILD:
1716 error = verify_area(VERIFY_WRITE, (void *) arg,
1717 sizeof(int));
1718 if (error)
1719 return error;
1720 put_fs_long(rs_wild_int_mask, (unsigned long *) arg);
1721 return 0;
1722
1723 case TIOCSERGETLSR:
1724 error = verify_area(VERIFY_WRITE, (void *) arg,
1725 sizeof(unsigned int));
1726 if (error)
1727 return error;
1728 else
1729 return get_lsr_info(info, (unsigned int *) arg);
1730
1731 case TIOCSERSWILD:
1732 if (!suser())
1733 return -EPERM;
1734 rs_wild_int_mask = get_fs_long((unsigned long *) arg);
1735 if (rs_wild_int_mask < 0)
1736 rs_wild_int_mask = check_wild_interrupts(0);
1737 return 0;
1738
1739 case TIOCSERGSTRUCT:
1740 error = verify_area(VERIFY_WRITE, (void *) arg,
1741 sizeof(struct async_struct));
1742 if (error)
1743 return error;
1744 memcpy_tofs((struct async_struct *) arg,
1745 info, sizeof(struct async_struct));
1746 return 0;
1747
1748 default:
1749 return -ENOIOCTLCMD;
1750 }
1751 return 0;
1752 }
1753
1754 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1755 {
1756 struct async_struct *info = (struct async_struct *)tty->driver_data;
1757
1758 if (tty->termios->c_cflag == old_termios->c_cflag)
1759 return;
1760
1761 change_speed(info);
1762
1763 if ((old_termios->c_cflag & CRTSCTS) &&
1764 !(tty->termios->c_cflag & CRTSCTS)) {
1765 tty->hw_stopped = 0;
1766 rs_start(tty);
1767 }
1768
1769 if (!(old_termios->c_cflag & CLOCAL) &&
1770 (tty->termios->c_cflag & CLOCAL))
1771 wake_up_interruptible(&info->open_wait);
1772 }
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784 static void rs_close(struct tty_struct *tty, struct file * filp)
1785 {
1786 struct async_struct * info = (struct async_struct *)tty->driver_data;
1787 unsigned long flags;
1788 unsigned long timeout;
1789
1790 if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
1791 return;
1792
1793 save_flags(flags); cli();
1794
1795 if (tty_hung_up_p(filp)) {
1796 restore_flags(flags);
1797 return;
1798 }
1799
1800 #ifdef SERIAL_DEBUG_OPEN
1801 printk("rs_close ttys%d, count = %d\n", info->line, info->count);
1802 #endif
1803 if ((tty->count == 1) && (info->count != 1)) {
1804
1805
1806
1807
1808
1809
1810
1811 printk("rs_close: bad serial port count; tty->count is 1, "
1812 "info->count is %d\n", info->count);
1813 info->count = 1;
1814 }
1815 if (--info->count < 0) {
1816 printk("rs_close: bad serial port count for ttys%d: %d\n",
1817 info->line, info->count);
1818 info->count = 0;
1819 }
1820 if (info->count) {
1821 restore_flags(flags);
1822 return;
1823 }
1824 info->flags |= ASYNC_CLOSING;
1825
1826
1827
1828
1829 if (info->flags & ASYNC_NORMAL_ACTIVE)
1830 info->normal_termios = *tty->termios;
1831 if (info->flags & ASYNC_CALLOUT_ACTIVE)
1832 info->callout_termios = *tty->termios;
1833
1834
1835
1836
1837
1838
1839 info->IER &= ~UART_IER_RLSI;
1840 serial_out(info, UART_IER, info->IER);
1841 info->read_status_mask &= ~UART_LSR_DR;
1842 if (info->flags & ASYNC_INITIALIZED) {
1843 wait_until_sent(tty, 3000);
1844
1845
1846
1847
1848
1849 timeout = jiffies+HZ;
1850 while (!(serial_inp(info, UART_LSR) & UART_LSR_TEMT)) {
1851 current->state = TASK_INTERRUPTIBLE;
1852 current->timeout = jiffies + info->timeout;
1853 schedule();
1854 if (jiffies > timeout)
1855 break;
1856 }
1857 }
1858 shutdown(info);
1859 if (tty->driver.flush_buffer)
1860 tty->driver.flush_buffer(tty);
1861 if (tty->ldisc.flush_buffer)
1862 tty->ldisc.flush_buffer(tty);
1863 info->event = 0;
1864 info->tty = 0;
1865 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1866 if (tty->ldisc.close)
1867 (tty->ldisc.close)(tty);
1868 tty->ldisc = ldiscs[N_TTY];
1869 tty->termios->c_line = N_TTY;
1870 if (tty->ldisc.open)
1871 (tty->ldisc.open)(tty);
1872 }
1873 if (info->blocked_open) {
1874 if (info->close_delay) {
1875 current->state = TASK_INTERRUPTIBLE;
1876 current->timeout = jiffies + info->close_delay;
1877 schedule();
1878 }
1879 wake_up_interruptible(&info->open_wait);
1880 }
1881 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
1882 ASYNC_CLOSING);
1883 wake_up_interruptible(&info->close_wait);
1884 restore_flags(flags);
1885 }
1886
1887
1888
1889
1890 void rs_hangup(struct tty_struct *tty)
1891 {
1892 struct async_struct * info = (struct async_struct *)tty->driver_data;
1893
1894 if (serial_paranoia_check(info, tty->device, "rs_hangup"))
1895 return;
1896
1897 shutdown(info);
1898 info->event = 0;
1899 info->count = 0;
1900 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
1901 info->tty = 0;
1902 wake_up_interruptible(&info->open_wait);
1903 }
1904
1905
1906
1907
1908
1909
1910 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1911 struct async_struct *info)
1912 {
1913 struct wait_queue wait = { current, NULL };
1914 int retval;
1915 int do_clocal = 0;
1916
1917
1918
1919
1920
1921 if (info->flags & ASYNC_CLOSING) {
1922 interruptible_sleep_on(&info->close_wait);
1923 #ifdef SERIAL_DO_RESTART
1924 if (info->flags & ASYNC_HUP_NOTIFY)
1925 return -EAGAIN;
1926 else
1927 return -ERESTARTSYS;
1928 #else
1929 return -EAGAIN;
1930 #endif
1931 }
1932
1933
1934
1935
1936
1937 if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
1938 if (info->flags & ASYNC_NORMAL_ACTIVE)
1939 return -EBUSY;
1940 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
1941 (info->flags & ASYNC_SESSION_LOCKOUT) &&
1942 (info->session != current->session))
1943 return -EBUSY;
1944 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
1945 (info->flags & ASYNC_PGRP_LOCKOUT) &&
1946 (info->pgrp != current->pgrp))
1947 return -EBUSY;
1948 info->flags |= ASYNC_CALLOUT_ACTIVE;
1949 return 0;
1950 }
1951
1952
1953
1954
1955
1956 if (filp->f_flags & O_NONBLOCK) {
1957 if (info->flags & ASYNC_CALLOUT_ACTIVE)
1958 return -EBUSY;
1959 info->flags |= ASYNC_NORMAL_ACTIVE;
1960 return 0;
1961 }
1962
1963 if (info->normal_termios.c_cflag & CLOCAL)
1964 do_clocal = 1;
1965
1966
1967
1968
1969
1970
1971
1972
1973 retval = 0;
1974 add_wait_queue(&info->open_wait, &wait);
1975 #ifdef SERIAL_DEBUG_OPEN
1976 printk("block_til_ready before block: ttys%d, count = %d\n",
1977 info->line, info->count);
1978 #endif
1979 info->count--;
1980 info->blocked_open++;
1981 while (1) {
1982 cli();
1983 if (!(info->flags & ASYNC_CALLOUT_ACTIVE))
1984 serial_out(info, UART_MCR,
1985 serial_inp(info, UART_MCR) |
1986 (UART_MCR_DTR | UART_MCR_RTS));
1987 sti();
1988 current->state = TASK_INTERRUPTIBLE;
1989 if (tty_hung_up_p(filp) ||
1990 !(info->flags & ASYNC_INITIALIZED)) {
1991 #ifdef SERIAL_DO_RESTART
1992 if (info->flags & ASYNC_HUP_NOTIFY)
1993 retval = -EAGAIN;
1994 else
1995 retval = -ERESTARTSYS;
1996 #else
1997 retval = -EAGAIN;
1998 #endif
1999 break;
2000 }
2001 if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
2002 !(info->flags & ASYNC_CLOSING) &&
2003 (do_clocal || (serial_in(info, UART_MSR) &
2004 UART_MSR_DCD)))
2005 break;
2006 if (current->signal & ~current->blocked) {
2007 retval = -ERESTARTSYS;
2008 break;
2009 }
2010 #ifdef SERIAL_DEBUG_OPEN
2011 printk("block_til_ready blocking: ttys%d, count = %d\n",
2012 info->line, info->count);
2013 #endif
2014 schedule();
2015 }
2016 current->state = TASK_RUNNING;
2017 remove_wait_queue(&info->open_wait, &wait);
2018 if (!tty_hung_up_p(filp))
2019 info->count++;
2020 info->blocked_open--;
2021 #ifdef SERIAL_DEBUG_OPEN
2022 printk("block_til_ready after blocking: ttys%d, count = %d\n",
2023 info->line, info->count);
2024 #endif
2025 if (retval)
2026 return retval;
2027 info->flags |= ASYNC_NORMAL_ACTIVE;
2028 return 0;
2029 }
2030
2031
2032
2033
2034
2035
2036
2037 int rs_open(struct tty_struct *tty, struct file * filp)
2038 {
2039 struct async_struct *info;
2040 int retval, line;
2041
2042 line = MINOR(tty->device) - tty->driver.minor_start;
2043 if ((line < 0) || (line >= NR_PORTS))
2044 return -ENODEV;
2045 info = rs_table + line;
2046 if (serial_paranoia_check(info, tty->device, "rs_open"))
2047 return -ENODEV;
2048
2049 #ifdef SERIAL_DEBUG_OPEN
2050 printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
2051 info->count);
2052 #endif
2053 info->count++;
2054 tty->driver_data = info;
2055 info->tty = tty;
2056
2057 if (!tmp_buf) {
2058 tmp_buf = (unsigned char *) get_free_page(GFP_KERNEL);
2059 if (!tmp_buf)
2060 return -ENOMEM;
2061 }
2062
2063
2064
2065
2066 retval = startup(info);
2067 if (retval)
2068 return retval;
2069
2070 retval = block_til_ready(tty, filp, info);
2071 if (retval) {
2072 #ifdef SERIAL_DEBUG_OPEN
2073 printk("rs_open returning after block_til_ready with %d\n",
2074 retval);
2075 #endif
2076 return retval;
2077 }
2078
2079 if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
2080 if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
2081 *tty->termios = info->normal_termios;
2082 else
2083 *tty->termios = info->callout_termios;
2084 change_speed(info);
2085 }
2086
2087 info->session = current->session;
2088 info->pgrp = current->pgrp;
2089
2090 #ifdef SERIAL_DEBUG_OPEN
2091 printk("rs_open ttys%d successful...", info->line);
2092 #endif
2093 return 0;
2094 }
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109 static void show_serial_version(void)
2110 {
2111 printk("Serial driver version 4.00 with");
2112 #ifdef CONFIG_HUB6
2113 printk(" HUB-6");
2114 #define SERIAL_OPT
2115 #endif
2116 #ifdef SERIAL_OPT
2117 printk(" enabled\n");
2118 #else
2119 printk(" no serial options enabled\n");
2120 #endif
2121 #undef SERIAL_OPT
2122 }
2123
2124
2125
2126
2127
2128
2129 static int get_auto_irq(struct async_struct *info)
2130 {
2131 unsigned char save_MCR, save_IER, save_ICP=0;
2132 unsigned short ICP=0, port = info->port;
2133 unsigned long timeout;
2134
2135
2136
2137
2138 rs_irq_triggered = 0;
2139 cli();
2140 save_IER = serial_inp(info, UART_IER);
2141 save_MCR = serial_inp(info, UART_MCR);
2142 if (info->flags & ASYNC_FOURPORT) {
2143 serial_outp(info, UART_MCR, UART_MCR_DTR | UART_MCR_RTS);
2144 serial_outp(info, UART_IER, 0x0f);
2145 ICP = (port & 0xFE0) | 0x01F;
2146 save_ICP = inb_p(ICP);
2147 outb_p(0x80, ICP);
2148 (void) inb_p(ICP);
2149 } else {
2150 serial_outp(info, UART_MCR,
2151 UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2);
2152 serial_outp(info, UART_IER, 0x0f);
2153 }
2154 sti();
2155
2156
2157
2158 (void)serial_inp(info, UART_LSR);
2159 (void)serial_inp(info, UART_RX);
2160 (void)serial_inp(info, UART_IIR);
2161 (void)serial_inp(info, UART_MSR);
2162
2163 timeout = jiffies+2;
2164 while (timeout >= jiffies) {
2165 if (rs_irq_triggered)
2166 break;
2167 }
2168
2169
2170
2171 cli();
2172 serial_outp(info, UART_IER, save_IER);
2173 serial_outp(info, UART_MCR, save_MCR);
2174 if (info->flags & ASYNC_FOURPORT)
2175 outb_p(save_ICP, ICP);
2176 sti();
2177 return(rs_irq_triggered);
2178 }
2179
2180
2181
2182
2183
2184 static int do_auto_irq(struct async_struct * info)
2185 {
2186 unsigned port = info->port;
2187 int irq_lines = 0;
2188 int irq_try_1 = 0, irq_try_2 = 0;
2189 int retries;
2190 unsigned long flags;
2191
2192 if (!port)
2193 return 0;
2194
2195
2196 save_flags(flags); sti();
2197
2198 irq_lines = grab_all_interrupts(rs_wild_int_mask);
2199
2200 for (retries = 0; retries < 5; retries++) {
2201 if (!irq_try_1)
2202 irq_try_1 = get_auto_irq(info);
2203 if (!irq_try_2)
2204 irq_try_2 = get_auto_irq(info);
2205 if (irq_try_1 && irq_try_2) {
2206 if (irq_try_1 == irq_try_2)
2207 break;
2208 irq_try_1 = irq_try_2 = 0;
2209 }
2210 }
2211 restore_flags(flags);
2212 free_all_interrupts(irq_lines);
2213 return (irq_try_1 == irq_try_2) ? irq_try_1 : 0;
2214 }
2215
2216
2217
2218
2219
2220
2221
2222
2223 static void autoconfig(struct async_struct * info)
2224 {
2225 unsigned char status1, status2, scratch, scratch2;
2226 unsigned port = info->port;
2227 unsigned long flags;
2228
2229 info->type = PORT_UNKNOWN;
2230
2231 if (!port)
2232 return;
2233
2234 save_flags(flags); cli();
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245 scratch = serial_inp(info, UART_IER);
2246 serial_outp(info, UART_IER, 0);
2247 outb(0xff, 0x080);
2248 scratch2 = serial_inp(info, UART_IER);
2249 serial_outp(info, UART_IER, scratch);
2250 if (scratch2) {
2251 restore_flags(flags);
2252 return;
2253 }
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264 if (!(info->flags & ASYNC_SKIP_TEST)) {
2265 scratch = serial_inp(info, UART_MCR);
2266 serial_outp(info, UART_MCR, UART_MCR_LOOP | scratch);
2267 scratch2 = serial_inp(info, UART_MSR);
2268 serial_outp(info, UART_MCR, UART_MCR_LOOP | 0x0A);
2269 status1 = serial_inp(info, UART_MSR) & 0xF0;
2270 serial_outp(info, UART_MCR, scratch);
2271 serial_outp(info, UART_MSR, scratch2);
2272 if (status1 != 0x90) {
2273 restore_flags(flags);
2274 return;
2275 }
2276 }
2277
2278
2279
2280
2281
2282 if (info->flags & ASYNC_AUTO_IRQ)
2283 info->irq = do_auto_irq(info);
2284
2285 serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
2286 scratch = serial_in(info, UART_IIR) >> 6;
2287 info->xmit_fifo_size = 1;
2288 switch (scratch) {
2289 case 0:
2290 info->type = PORT_16450;
2291 break;
2292 case 1:
2293 info->type = PORT_UNKNOWN;
2294 break;
2295 case 2:
2296 info->type = PORT_16550;
2297 break;
2298 case 3:
2299 info->type = PORT_16550A;
2300 info->xmit_fifo_size = 16;
2301 break;
2302 }
2303 if (info->type == PORT_16450) {
2304 scratch = serial_in(info, UART_SCR);
2305 serial_outp(info, UART_SCR, 0xa5);
2306 status1 = serial_in(info, UART_SCR);
2307 serial_outp(info, UART_SCR, 0x5a);
2308 status2 = serial_in(info, UART_SCR);
2309 serial_outp(info, UART_SCR, scratch);
2310
2311 if ((status1 != 0xa5) || (status2 != 0x5a))
2312 info->type = PORT_8250;
2313 }
2314
2315
2316
2317
2318 serial_outp(info, UART_MCR, 0x00);
2319 serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
2320 UART_FCR_CLEAR_XMIT));
2321 (void)serial_in(info, UART_RX);
2322
2323 restore_flags(flags);
2324 }
2325
2326
2327
2328
2329 long rs_init(long kmem_start)
2330 {
2331 int i;
2332 struct async_struct * info;
2333
2334 bh_base[SERIAL_BH].routine = do_serial_bh;
2335 timer_table[RS_TIMER].fn = rs_timer;
2336 timer_table[RS_TIMER].expires = 0;
2337 #ifdef CONFIG_AUTO_IRQ
2338 rs_wild_int_mask = check_wild_interrupts(1);
2339 #endif
2340
2341 for (i = 0; i < 16; i++) {
2342 IRQ_ports[i] = 0;
2343 IRQ_timeout[i] = 0;
2344 }
2345
2346 show_serial_version();
2347
2348
2349
2350 memset(&serial_driver, 0, sizeof(struct tty_driver));
2351 serial_driver.magic = TTY_DRIVER_MAGIC;
2352 serial_driver.name = "ttyS";
2353 serial_driver.major = TTY_MAJOR;
2354 serial_driver.minor_start = 64;
2355 serial_driver.num = NR_PORTS;
2356 serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
2357 serial_driver.subtype = SERIAL_TYPE_NORMAL;
2358 serial_driver.init_termios = tty_std_termios;
2359 serial_driver.init_termios.c_cflag =
2360 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2361 serial_driver.flags = TTY_DRIVER_REAL_RAW;
2362 serial_driver.refcount = &serial_refcount;
2363 serial_driver.table = serial_table;
2364 serial_driver.termios = serial_termios;
2365 serial_driver.termios_locked = serial_termios_locked;
2366
2367 serial_driver.open = rs_open;
2368 serial_driver.close = rs_close;
2369 serial_driver.write = rs_write;
2370 serial_driver.put_char = rs_put_char;
2371 serial_driver.flush_chars = rs_flush_chars;
2372 serial_driver.write_room = rs_write_room;
2373 serial_driver.chars_in_buffer = rs_chars_in_buffer;
2374 serial_driver.flush_buffer = rs_flush_buffer;
2375 serial_driver.ioctl = rs_ioctl;
2376 serial_driver.throttle = rs_throttle;
2377 serial_driver.unthrottle = rs_unthrottle;
2378 serial_driver.set_termios = rs_set_termios;
2379 serial_driver.stop = rs_stop;
2380 serial_driver.start = rs_start;
2381 serial_driver.hangup = rs_hangup;
2382
2383
2384
2385
2386
2387 callout_driver = serial_driver;
2388 callout_driver.name = "cua";
2389 callout_driver.major = TTYAUX_MAJOR;
2390 callout_driver.subtype = SERIAL_TYPE_CALLOUT;
2391
2392 if (tty_register_driver(&serial_driver))
2393 panic("Couldn't register serial driver\n");
2394 if (tty_register_driver(&callout_driver))
2395 panic("Couldn't register callout driver\n");
2396
2397 for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) {
2398 info->magic = SERIAL_MAGIC;
2399 info->line = i;
2400 info->tty = 0;
2401 info->type = PORT_UNKNOWN;
2402 info->custom_divisor = 0;
2403 info->close_delay = 50;
2404 info->x_char = 0;
2405 info->event = 0;
2406 info->count = 0;
2407 info->blocked_open = 0;
2408 info->tqueue.routine = do_softint;
2409 info->tqueue.data = info;
2410 info->callout_termios =callout_driver.init_termios;
2411 info->normal_termios = serial_driver.init_termios;
2412 info->open_wait = 0;
2413 info->close_wait = 0;
2414 info->next_port = 0;
2415 info->prev_port = 0;
2416 if (info->irq == 2)
2417 info->irq = 9;
2418 if (!(info->flags & ASYNC_BOOT_AUTOCONF))
2419 continue;
2420 autoconfig(info);
2421 if (info->type == PORT_UNKNOWN)
2422 continue;
2423 printk("tty%02d%s at 0x%04x (irq = %d)", info->line,
2424 (info->flags & ASYNC_FOURPORT) ? " FourPort" : "",
2425 info->port, info->irq);
2426 switch (info->type) {
2427 case PORT_8250:
2428 printk(" is a 8250\n");
2429 break;
2430 case PORT_16450:
2431 printk(" is a 16450\n");
2432 break;
2433 case PORT_16550:
2434 printk(" is a 16550\n");
2435 break;
2436 case PORT_16550A:
2437 printk(" is a 16550A\n");
2438 break;
2439 default:
2440 printk("\n");
2441 break;
2442 }
2443 }
2444 return kmem_start;
2445 }
2446
2447
2448
2449
2450
2451 int register_serial(struct serial_struct *req)
2452 {
2453 int i;
2454 unsigned long flags;
2455 struct async_struct *info;
2456
2457 save_flags(flags);
2458 cli();
2459 for (i = 0; i < NR_PORTS; i++) {
2460 if (rs_table[i].port == req->port)
2461 break;
2462 }
2463 if (i == NR_PORTS) {
2464 for (i = 0; i < NR_PORTS; i++)
2465 if ((rs_table[i].type == PORT_UNKNOWN) &&
2466 (rs_table[i].count == 0))
2467 break;
2468 }
2469 if (i == NR_PORTS) {
2470 restore_flags(flags);
2471 return -1;
2472 }
2473 info = &rs_table[i];
2474 if (rs_table[i].count) {
2475 restore_flags(flags);
2476 printk("Couldn't configure serial #%d (port=%d,irq=%d): "
2477 "device already open\n", i, req->port, req->irq);
2478 return -1;
2479 }
2480 info->irq = req->irq;
2481 info->port = req->port;
2482 autoconfig(info);
2483 if (info->type == PORT_UNKNOWN) {
2484 restore_flags(flags);
2485 printk("register_serial(): autoconfig failed\n");
2486 return -1;
2487 }
2488 printk("tty%02d at 0x%04x (irq = %d)", info->line,
2489 info->port, info->irq);
2490 switch (info->type) {
2491 case PORT_8250:
2492 printk(" is a 8250\n"); break;
2493 case PORT_16450:
2494 printk(" is a 16450\n"); break;
2495 case PORT_16550:
2496 printk(" is a 16550\n"); break;
2497 case PORT_16550A:
2498 printk(" is a 16550A\n"); break;
2499 default:
2500 printk("\n"); break;
2501 }
2502 restore_flags(flags);
2503 return info->line;
2504 }
2505
2506 void unregister_serial(int line)
2507 {
2508 unsigned long flags;
2509 struct async_struct *info = &rs_table[line];
2510
2511 save_flags(flags);
2512 cli();
2513 if (info->tty)
2514 tty_hangup(info->tty);
2515 info->type = PORT_UNKNOWN;
2516 printk("tty%02d unloaded\n", info->line);
2517 restore_flags(flags);
2518 }