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10#include <linux/module.h>
11#include <linux/tty.h>
12#include <linux/tty_flip.h>
13#include <linux/slab.h>
14#include <linux/sched/signal.h>
15#include <linux/init.h>
16#include <linux/console.h>
17#include <linux/gpio/consumer.h>
18#include <linux/of.h>
19#include <linux/proc_fs.h>
20#include <linux/seq_file.h>
21#include <linux/device.h>
22#include <linux/serial.h>
23#include <linux/serial_core.h>
24#include <linux/sysrq.h>
25#include <linux/delay.h>
26#include <linux/mutex.h>
27#include <linux/security.h>
28
29#include <linux/irq.h>
30#include <linux/uaccess.h>
31
32
33
34
35static DEFINE_MUTEX(port_mutex);
36
37
38
39
40
41static struct lock_class_key port_lock_key;
42
43#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
44
45static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
46 struct ktermios *old_termios);
47static void uart_wait_until_sent(struct tty_struct *tty, int timeout);
48static void uart_change_pm(struct uart_state *state,
49 enum uart_pm_state pm_state);
50
51static void uart_port_shutdown(struct tty_port *port);
52
53static int uart_dcd_enabled(struct uart_port *uport)
54{
55 return !!(uport->status & UPSTAT_DCD_ENABLE);
56}
57
58static inline struct uart_port *uart_port_ref(struct uart_state *state)
59{
60 if (atomic_add_unless(&state->refcount, 1, 0))
61 return state->uart_port;
62 return NULL;
63}
64
65static inline void uart_port_deref(struct uart_port *uport)
66{
67 if (atomic_dec_and_test(&uport->state->refcount))
68 wake_up(&uport->state->remove_wait);
69}
70
71#define uart_port_lock(state, flags) \
72 ({ \
73 struct uart_port *__uport = uart_port_ref(state); \
74 if (__uport) \
75 spin_lock_irqsave(&__uport->lock, flags); \
76 __uport; \
77 })
78
79#define uart_port_unlock(uport, flags) \
80 ({ \
81 struct uart_port *__uport = uport; \
82 if (__uport) { \
83 spin_unlock_irqrestore(&__uport->lock, flags); \
84 uart_port_deref(__uport); \
85 } \
86 })
87
88static inline struct uart_port *uart_port_check(struct uart_state *state)
89{
90 lockdep_assert_held(&state->port.mutex);
91 return state->uart_port;
92}
93
94
95
96
97
98void uart_write_wakeup(struct uart_port *port)
99{
100 struct uart_state *state = port->state;
101
102
103
104
105 BUG_ON(!state);
106 tty_port_tty_wakeup(&state->port);
107}
108
109static void uart_stop(struct tty_struct *tty)
110{
111 struct uart_state *state = tty->driver_data;
112 struct uart_port *port;
113 unsigned long flags;
114
115 port = uart_port_lock(state, flags);
116 if (port)
117 port->ops->stop_tx(port);
118 uart_port_unlock(port, flags);
119}
120
121static void __uart_start(struct tty_struct *tty)
122{
123 struct uart_state *state = tty->driver_data;
124 struct uart_port *port = state->uart_port;
125
126 if (port && !uart_tx_stopped(port))
127 port->ops->start_tx(port);
128}
129
130static void uart_start(struct tty_struct *tty)
131{
132 struct uart_state *state = tty->driver_data;
133 struct uart_port *port;
134 unsigned long flags;
135
136 port = uart_port_lock(state, flags);
137 __uart_start(tty);
138 uart_port_unlock(port, flags);
139}
140
141static void
142uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
143{
144 unsigned long flags;
145 unsigned int old;
146
147 spin_lock_irqsave(&port->lock, flags);
148 old = port->mctrl;
149 port->mctrl = (old & ~clear) | set;
150 if (old != port->mctrl)
151 port->ops->set_mctrl(port, port->mctrl);
152 spin_unlock_irqrestore(&port->lock, flags);
153}
154
155#define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0)
156#define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear)
157
158static void uart_port_dtr_rts(struct uart_port *uport, int raise)
159{
160 int rs485_on = uport->rs485_config &&
161 (uport->rs485.flags & SER_RS485_ENABLED);
162 int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND);
163
164 if (raise) {
165 if (rs485_on && !RTS_after_send) {
166 uart_set_mctrl(uport, TIOCM_DTR);
167 uart_clear_mctrl(uport, TIOCM_RTS);
168 } else {
169 uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
170 }
171 } else {
172 unsigned int clear = TIOCM_DTR;
173
174 clear |= (!rs485_on || !RTS_after_send) ? TIOCM_RTS : 0;
175 uart_clear_mctrl(uport, clear);
176 }
177}
178
179
180
181
182
183static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
184 int init_hw)
185{
186 struct uart_port *uport = uart_port_check(state);
187 unsigned long flags;
188 unsigned long page;
189 int retval = 0;
190
191 if (uport->type == PORT_UNKNOWN)
192 return 1;
193
194
195
196
197 uart_change_pm(state, UART_PM_STATE_ON);
198
199
200
201
202
203 page = get_zeroed_page(GFP_KERNEL);
204 if (!page)
205 return -ENOMEM;
206
207 uart_port_lock(state, flags);
208 if (!state->xmit.buf) {
209 state->xmit.buf = (unsigned char *) page;
210 uart_circ_clear(&state->xmit);
211 uart_port_unlock(uport, flags);
212 } else {
213 uart_port_unlock(uport, flags);
214
215
216
217
218 free_page(page);
219 }
220
221 retval = uport->ops->startup(uport);
222 if (retval == 0) {
223 if (uart_console(uport) && uport->cons->cflag) {
224 tty->termios.c_cflag = uport->cons->cflag;
225 uport->cons->cflag = 0;
226 }
227
228
229
230 uart_change_speed(tty, state, NULL);
231
232
233
234
235
236 if (init_hw && C_BAUD(tty))
237 uart_port_dtr_rts(uport, 1);
238 }
239
240
241
242
243
244
245 if (retval && capable(CAP_SYS_ADMIN))
246 return 1;
247
248 return retval;
249}
250
251static int uart_startup(struct tty_struct *tty, struct uart_state *state,
252 int init_hw)
253{
254 struct tty_port *port = &state->port;
255 int retval;
256
257 if (tty_port_initialized(port))
258 return 0;
259
260 retval = uart_port_startup(tty, state, init_hw);
261 if (retval)
262 set_bit(TTY_IO_ERROR, &tty->flags);
263
264 return retval;
265}
266
267
268
269
270
271
272
273
274static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
275{
276 struct uart_port *uport = uart_port_check(state);
277 struct tty_port *port = &state->port;
278 unsigned long flags;
279 char *xmit_buf = NULL;
280
281
282
283
284 if (tty)
285 set_bit(TTY_IO_ERROR, &tty->flags);
286
287 if (tty_port_initialized(port)) {
288 tty_port_set_initialized(port, 0);
289
290
291
292
293 if (uport && uart_console(uport) && tty)
294 uport->cons->cflag = tty->termios.c_cflag;
295
296 if (!tty || C_HUPCL(tty))
297 uart_port_dtr_rts(uport, 0);
298
299 uart_port_shutdown(port);
300 }
301
302
303
304
305
306
307 tty_port_set_suspended(port, 0);
308
309
310
311
312
313
314
315 uart_port_lock(state, flags);
316 xmit_buf = state->xmit.buf;
317 state->xmit.buf = NULL;
318 uart_port_unlock(uport, flags);
319
320 if (xmit_buf)
321 free_page((unsigned long)xmit_buf);
322}
323
324
325
326
327
328
329
330
331
332
333void
334uart_update_timeout(struct uart_port *port, unsigned int cflag,
335 unsigned int baud)
336{
337 unsigned int size;
338
339 size = tty_get_frame_size(cflag) * port->fifosize;
340
341
342
343
344
345 port->timeout = (HZ * size) / baud + HZ/50;
346}
347
348EXPORT_SYMBOL(uart_update_timeout);
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369unsigned int
370uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
371 struct ktermios *old, unsigned int min, unsigned int max)
372{
373 unsigned int try;
374 unsigned int baud;
375 unsigned int altbaud;
376 int hung_up = 0;
377 upf_t flags = port->flags & UPF_SPD_MASK;
378
379 switch (flags) {
380 case UPF_SPD_HI:
381 altbaud = 57600;
382 break;
383 case UPF_SPD_VHI:
384 altbaud = 115200;
385 break;
386 case UPF_SPD_SHI:
387 altbaud = 230400;
388 break;
389 case UPF_SPD_WARP:
390 altbaud = 460800;
391 break;
392 default:
393 altbaud = 38400;
394 break;
395 }
396
397 for (try = 0; try < 2; try++) {
398 baud = tty_termios_baud_rate(termios);
399
400
401
402
403
404 if (try == 0 && baud == 38400)
405 baud = altbaud;
406
407
408
409
410 if (baud == 0) {
411 hung_up = 1;
412 baud = 9600;
413 }
414
415 if (baud >= min && baud <= max)
416 return baud;
417
418
419
420
421
422 termios->c_cflag &= ~CBAUD;
423 if (old) {
424 baud = tty_termios_baud_rate(old);
425 if (!hung_up)
426 tty_termios_encode_baud_rate(termios,
427 baud, baud);
428 old = NULL;
429 continue;
430 }
431
432
433
434
435
436 if (!hung_up) {
437 if (baud <= min)
438 tty_termios_encode_baud_rate(termios,
439 min + 1, min + 1);
440 else
441 tty_termios_encode_baud_rate(termios,
442 max - 1, max - 1);
443 }
444 }
445
446 WARN_ON(1);
447 return 0;
448}
449
450EXPORT_SYMBOL(uart_get_baud_rate);
451
452
453
454
455
456
457
458
459unsigned int
460uart_get_divisor(struct uart_port *port, unsigned int baud)
461{
462 unsigned int quot;
463
464
465
466
467 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
468 quot = port->custom_divisor;
469 else
470 quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud);
471
472 return quot;
473}
474
475EXPORT_SYMBOL(uart_get_divisor);
476
477
478static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
479 struct ktermios *old_termios)
480{
481 struct uart_port *uport = uart_port_check(state);
482 struct ktermios *termios;
483 int hw_stopped;
484
485
486
487
488
489 if (!tty || uport->type == PORT_UNKNOWN)
490 return;
491
492 termios = &tty->termios;
493 uport->ops->set_termios(uport, termios, old_termios);
494
495
496
497
498 spin_lock_irq(&uport->lock);
499 if (termios->c_cflag & CRTSCTS)
500 uport->status |= UPSTAT_CTS_ENABLE;
501 else
502 uport->status &= ~UPSTAT_CTS_ENABLE;
503
504 if (termios->c_cflag & CLOCAL)
505 uport->status &= ~UPSTAT_DCD_ENABLE;
506 else
507 uport->status |= UPSTAT_DCD_ENABLE;
508
509
510 hw_stopped = uport->hw_stopped;
511 uport->hw_stopped = uart_softcts_mode(uport) &&
512 !(uport->ops->get_mctrl(uport) & TIOCM_CTS);
513 if (uport->hw_stopped) {
514 if (!hw_stopped)
515 uport->ops->stop_tx(uport);
516 } else {
517 if (hw_stopped)
518 __uart_start(tty);
519 }
520 spin_unlock_irq(&uport->lock);
521}
522
523static int uart_put_char(struct tty_struct *tty, unsigned char c)
524{
525 struct uart_state *state = tty->driver_data;
526 struct uart_port *port;
527 struct circ_buf *circ;
528 unsigned long flags;
529 int ret = 0;
530
531 circ = &state->xmit;
532 port = uart_port_lock(state, flags);
533 if (!circ->buf) {
534 uart_port_unlock(port, flags);
535 return 0;
536 }
537
538 if (port && uart_circ_chars_free(circ) != 0) {
539 circ->buf[circ->head] = c;
540 circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1);
541 ret = 1;
542 }
543 uart_port_unlock(port, flags);
544 return ret;
545}
546
547static void uart_flush_chars(struct tty_struct *tty)
548{
549 uart_start(tty);
550}
551
552static int uart_write(struct tty_struct *tty,
553 const unsigned char *buf, int count)
554{
555 struct uart_state *state = tty->driver_data;
556 struct uart_port *port;
557 struct circ_buf *circ;
558 unsigned long flags;
559 int c, ret = 0;
560
561
562
563
564
565 if (!state) {
566 WARN_ON(1);
567 return -EL3HLT;
568 }
569
570 port = uart_port_lock(state, flags);
571 circ = &state->xmit;
572 if (!circ->buf) {
573 uart_port_unlock(port, flags);
574 return 0;
575 }
576
577 while (port) {
578 c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
579 if (count < c)
580 c = count;
581 if (c <= 0)
582 break;
583 memcpy(circ->buf + circ->head, buf, c);
584 circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
585 buf += c;
586 count -= c;
587 ret += c;
588 }
589
590 __uart_start(tty);
591 uart_port_unlock(port, flags);
592 return ret;
593}
594
595static unsigned int uart_write_room(struct tty_struct *tty)
596{
597 struct uart_state *state = tty->driver_data;
598 struct uart_port *port;
599 unsigned long flags;
600 unsigned int ret;
601
602 port = uart_port_lock(state, flags);
603 ret = uart_circ_chars_free(&state->xmit);
604 uart_port_unlock(port, flags);
605 return ret;
606}
607
608static unsigned int uart_chars_in_buffer(struct tty_struct *tty)
609{
610 struct uart_state *state = tty->driver_data;
611 struct uart_port *port;
612 unsigned long flags;
613 unsigned int ret;
614
615 port = uart_port_lock(state, flags);
616 ret = uart_circ_chars_pending(&state->xmit);
617 uart_port_unlock(port, flags);
618 return ret;
619}
620
621static void uart_flush_buffer(struct tty_struct *tty)
622{
623 struct uart_state *state = tty->driver_data;
624 struct uart_port *port;
625 unsigned long flags;
626
627
628
629
630
631 if (!state) {
632 WARN_ON(1);
633 return;
634 }
635
636 pr_debug("uart_flush_buffer(%d) called\n", tty->index);
637
638 port = uart_port_lock(state, flags);
639 if (!port)
640 return;
641 uart_circ_clear(&state->xmit);
642 if (port->ops->flush_buffer)
643 port->ops->flush_buffer(port);
644 uart_port_unlock(port, flags);
645 tty_port_tty_wakeup(&state->port);
646}
647
648
649
650
651
652static void uart_send_xchar(struct tty_struct *tty, char ch)
653{
654 struct uart_state *state = tty->driver_data;
655 struct uart_port *port;
656 unsigned long flags;
657
658 port = uart_port_ref(state);
659 if (!port)
660 return;
661
662 if (port->ops->send_xchar)
663 port->ops->send_xchar(port, ch);
664 else {
665 spin_lock_irqsave(&port->lock, flags);
666 port->x_char = ch;
667 if (ch)
668 port->ops->start_tx(port);
669 spin_unlock_irqrestore(&port->lock, flags);
670 }
671 uart_port_deref(port);
672}
673
674static void uart_throttle(struct tty_struct *tty)
675{
676 struct uart_state *state = tty->driver_data;
677 upstat_t mask = UPSTAT_SYNC_FIFO;
678 struct uart_port *port;
679
680 port = uart_port_ref(state);
681 if (!port)
682 return;
683
684 if (I_IXOFF(tty))
685 mask |= UPSTAT_AUTOXOFF;
686 if (C_CRTSCTS(tty))
687 mask |= UPSTAT_AUTORTS;
688
689 if (port->status & mask) {
690 port->ops->throttle(port);
691 mask &= ~port->status;
692 }
693
694 if (mask & UPSTAT_AUTORTS)
695 uart_clear_mctrl(port, TIOCM_RTS);
696
697 if (mask & UPSTAT_AUTOXOFF)
698 uart_send_xchar(tty, STOP_CHAR(tty));
699
700 uart_port_deref(port);
701}
702
703static void uart_unthrottle(struct tty_struct *tty)
704{
705 struct uart_state *state = tty->driver_data;
706 upstat_t mask = UPSTAT_SYNC_FIFO;
707 struct uart_port *port;
708
709 port = uart_port_ref(state);
710 if (!port)
711 return;
712
713 if (I_IXOFF(tty))
714 mask |= UPSTAT_AUTOXOFF;
715 if (C_CRTSCTS(tty))
716 mask |= UPSTAT_AUTORTS;
717
718 if (port->status & mask) {
719 port->ops->unthrottle(port);
720 mask &= ~port->status;
721 }
722
723 if (mask & UPSTAT_AUTORTS)
724 uart_set_mctrl(port, TIOCM_RTS);
725
726 if (mask & UPSTAT_AUTOXOFF)
727 uart_send_xchar(tty, START_CHAR(tty));
728
729 uart_port_deref(port);
730}
731
732static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo)
733{
734 struct uart_state *state = container_of(port, struct uart_state, port);
735 struct uart_port *uport;
736 int ret = -ENODEV;
737
738
739
740
741
742 mutex_lock(&port->mutex);
743 uport = uart_port_check(state);
744 if (!uport)
745 goto out;
746
747 retinfo->type = uport->type;
748 retinfo->line = uport->line;
749 retinfo->port = uport->iobase;
750 if (HIGH_BITS_OFFSET)
751 retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET;
752 retinfo->irq = uport->irq;
753 retinfo->flags = (__force int)uport->flags;
754 retinfo->xmit_fifo_size = uport->fifosize;
755 retinfo->baud_base = uport->uartclk / 16;
756 retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10;
757 retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
758 ASYNC_CLOSING_WAIT_NONE :
759 jiffies_to_msecs(port->closing_wait) / 10;
760 retinfo->custom_divisor = uport->custom_divisor;
761 retinfo->hub6 = uport->hub6;
762 retinfo->io_type = uport->iotype;
763 retinfo->iomem_reg_shift = uport->regshift;
764 retinfo->iomem_base = (void *)(unsigned long)uport->mapbase;
765
766 ret = 0;
767out:
768 mutex_unlock(&port->mutex);
769 return ret;
770}
771
772static int uart_get_info_user(struct tty_struct *tty,
773 struct serial_struct *ss)
774{
775 struct uart_state *state = tty->driver_data;
776 struct tty_port *port = &state->port;
777
778 return uart_get_info(port, ss) < 0 ? -EIO : 0;
779}
780
781static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
782 struct uart_state *state,
783 struct serial_struct *new_info)
784{
785 struct uart_port *uport = uart_port_check(state);
786 unsigned long new_port;
787 unsigned int change_irq, change_port, closing_wait;
788 unsigned int old_custom_divisor, close_delay;
789 upf_t old_flags, new_flags;
790 int retval = 0;
791
792 if (!uport)
793 return -EIO;
794
795 new_port = new_info->port;
796 if (HIGH_BITS_OFFSET)
797 new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET;
798
799 new_info->irq = irq_canonicalize(new_info->irq);
800 close_delay = msecs_to_jiffies(new_info->close_delay * 10);
801 closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
802 ASYNC_CLOSING_WAIT_NONE :
803 msecs_to_jiffies(new_info->closing_wait * 10);
804
805
806 change_irq = !(uport->flags & UPF_FIXED_PORT)
807 && new_info->irq != uport->irq;
808
809
810
811
812
813
814 change_port = !(uport->flags & UPF_FIXED_PORT)
815 && (new_port != uport->iobase ||
816 (unsigned long)new_info->iomem_base != uport->mapbase ||
817 new_info->hub6 != uport->hub6 ||
818 new_info->io_type != uport->iotype ||
819 new_info->iomem_reg_shift != uport->regshift ||
820 new_info->type != uport->type);
821
822 old_flags = uport->flags;
823 new_flags = (__force upf_t)new_info->flags;
824 old_custom_divisor = uport->custom_divisor;
825
826 if (!capable(CAP_SYS_ADMIN)) {
827 retval = -EPERM;
828 if (change_irq || change_port ||
829 (new_info->baud_base != uport->uartclk / 16) ||
830 (close_delay != port->close_delay) ||
831 (closing_wait != port->closing_wait) ||
832 (new_info->xmit_fifo_size &&
833 new_info->xmit_fifo_size != uport->fifosize) ||
834 (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0))
835 goto exit;
836 uport->flags = ((uport->flags & ~UPF_USR_MASK) |
837 (new_flags & UPF_USR_MASK));
838 uport->custom_divisor = new_info->custom_divisor;
839 goto check_and_exit;
840 }
841
842 if (change_irq || change_port) {
843 retval = security_locked_down(LOCKDOWN_TIOCSSERIAL);
844 if (retval)
845 goto exit;
846 }
847
848
849
850
851 if (uport->ops->verify_port)
852 retval = uport->ops->verify_port(uport, new_info);
853
854 if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) ||
855 (new_info->baud_base < 9600))
856 retval = -EINVAL;
857
858 if (retval)
859 goto exit;
860
861 if (change_port || change_irq) {
862 retval = -EBUSY;
863
864
865
866
867 if (tty_port_users(port) > 1)
868 goto exit;
869
870
871
872
873
874 uart_shutdown(tty, state);
875 }
876
877 if (change_port) {
878 unsigned long old_iobase, old_mapbase;
879 unsigned int old_type, old_iotype, old_hub6, old_shift;
880
881 old_iobase = uport->iobase;
882 old_mapbase = uport->mapbase;
883 old_type = uport->type;
884 old_hub6 = uport->hub6;
885 old_iotype = uport->iotype;
886 old_shift = uport->regshift;
887
888
889
890
891 if (old_type != PORT_UNKNOWN && uport->ops->release_port)
892 uport->ops->release_port(uport);
893
894 uport->iobase = new_port;
895 uport->type = new_info->type;
896 uport->hub6 = new_info->hub6;
897 uport->iotype = new_info->io_type;
898 uport->regshift = new_info->iomem_reg_shift;
899 uport->mapbase = (unsigned long)new_info->iomem_base;
900
901
902
903
904 if (uport->type != PORT_UNKNOWN && uport->ops->request_port) {
905 retval = uport->ops->request_port(uport);
906 } else {
907
908 retval = 0;
909 }
910
911
912
913
914
915 if (retval) {
916 uport->iobase = old_iobase;
917 uport->type = old_type;
918 uport->hub6 = old_hub6;
919 uport->iotype = old_iotype;
920 uport->regshift = old_shift;
921 uport->mapbase = old_mapbase;
922
923 if (old_type != PORT_UNKNOWN) {
924 retval = uport->ops->request_port(uport);
925
926
927
928
929 if (retval)
930 uport->type = PORT_UNKNOWN;
931
932
933
934
935 retval = -EBUSY;
936 }
937
938
939 goto exit;
940 }
941 }
942
943 if (change_irq)
944 uport->irq = new_info->irq;
945 if (!(uport->flags & UPF_FIXED_PORT))
946 uport->uartclk = new_info->baud_base * 16;
947 uport->flags = (uport->flags & ~UPF_CHANGE_MASK) |
948 (new_flags & UPF_CHANGE_MASK);
949 uport->custom_divisor = new_info->custom_divisor;
950 port->close_delay = close_delay;
951 port->closing_wait = closing_wait;
952 if (new_info->xmit_fifo_size)
953 uport->fifosize = new_info->xmit_fifo_size;
954
955 check_and_exit:
956 retval = 0;
957 if (uport->type == PORT_UNKNOWN)
958 goto exit;
959 if (tty_port_initialized(port)) {
960 if (((old_flags ^ uport->flags) & UPF_SPD_MASK) ||
961 old_custom_divisor != uport->custom_divisor) {
962
963
964
965
966 if (uport->flags & UPF_SPD_MASK) {
967 dev_notice_ratelimited(uport->dev,
968 "%s sets custom speed on %s. This is deprecated.\n",
969 current->comm,
970 tty_name(port->tty));
971 }
972 uart_change_speed(tty, state, NULL);
973 }
974 } else {
975 retval = uart_startup(tty, state, 1);
976 if (retval == 0)
977 tty_port_set_initialized(port, true);
978 if (retval > 0)
979 retval = 0;
980 }
981 exit:
982 return retval;
983}
984
985static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss)
986{
987 struct uart_state *state = tty->driver_data;
988 struct tty_port *port = &state->port;
989 int retval;
990
991 down_write(&tty->termios_rwsem);
992
993
994
995
996
997
998
999 mutex_lock(&port->mutex);
1000 retval = uart_set_info(tty, port, state, ss);
1001 mutex_unlock(&port->mutex);
1002 up_write(&tty->termios_rwsem);
1003 return retval;
1004}
1005
1006
1007
1008
1009
1010
1011
1012static int uart_get_lsr_info(struct tty_struct *tty,
1013 struct uart_state *state, unsigned int __user *value)
1014{
1015 struct uart_port *uport = uart_port_check(state);
1016 unsigned int result;
1017
1018 result = uport->ops->tx_empty(uport);
1019
1020
1021
1022
1023
1024
1025
1026 if (uport->x_char ||
1027 ((uart_circ_chars_pending(&state->xmit) > 0) &&
1028 !uart_tx_stopped(uport)))
1029 result &= ~TIOCSER_TEMT;
1030
1031 return put_user(result, value);
1032}
1033
1034static int uart_tiocmget(struct tty_struct *tty)
1035{
1036 struct uart_state *state = tty->driver_data;
1037 struct tty_port *port = &state->port;
1038 struct uart_port *uport;
1039 int result = -EIO;
1040
1041 mutex_lock(&port->mutex);
1042 uport = uart_port_check(state);
1043 if (!uport)
1044 goto out;
1045
1046 if (!tty_io_error(tty)) {
1047 result = uport->mctrl;
1048 spin_lock_irq(&uport->lock);
1049 result |= uport->ops->get_mctrl(uport);
1050 spin_unlock_irq(&uport->lock);
1051 }
1052out:
1053 mutex_unlock(&port->mutex);
1054 return result;
1055}
1056
1057static int
1058uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
1059{
1060 struct uart_state *state = tty->driver_data;
1061 struct tty_port *port = &state->port;
1062 struct uart_port *uport;
1063 int ret = -EIO;
1064
1065 mutex_lock(&port->mutex);
1066 uport = uart_port_check(state);
1067 if (!uport)
1068 goto out;
1069
1070 if (!tty_io_error(tty)) {
1071 uart_update_mctrl(uport, set, clear);
1072 ret = 0;
1073 }
1074out:
1075 mutex_unlock(&port->mutex);
1076 return ret;
1077}
1078
1079static int uart_break_ctl(struct tty_struct *tty, int break_state)
1080{
1081 struct uart_state *state = tty->driver_data;
1082 struct tty_port *port = &state->port;
1083 struct uart_port *uport;
1084 int ret = -EIO;
1085
1086 mutex_lock(&port->mutex);
1087 uport = uart_port_check(state);
1088 if (!uport)
1089 goto out;
1090
1091 if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl)
1092 uport->ops->break_ctl(uport, break_state);
1093 ret = 0;
1094out:
1095 mutex_unlock(&port->mutex);
1096 return ret;
1097}
1098
1099static int uart_do_autoconfig(struct tty_struct *tty, struct uart_state *state)
1100{
1101 struct tty_port *port = &state->port;
1102 struct uart_port *uport;
1103 int flags, ret;
1104
1105 if (!capable(CAP_SYS_ADMIN))
1106 return -EPERM;
1107
1108
1109
1110
1111
1112
1113 if (mutex_lock_interruptible(&port->mutex))
1114 return -ERESTARTSYS;
1115
1116 uport = uart_port_check(state);
1117 if (!uport) {
1118 ret = -EIO;
1119 goto out;
1120 }
1121
1122 ret = -EBUSY;
1123 if (tty_port_users(port) == 1) {
1124 uart_shutdown(tty, state);
1125
1126
1127
1128
1129
1130 if (uport->type != PORT_UNKNOWN && uport->ops->release_port)
1131 uport->ops->release_port(uport);
1132
1133 flags = UART_CONFIG_TYPE;
1134 if (uport->flags & UPF_AUTO_IRQ)
1135 flags |= UART_CONFIG_IRQ;
1136
1137
1138
1139
1140
1141 uport->ops->config_port(uport, flags);
1142
1143 ret = uart_startup(tty, state, 1);
1144 if (ret == 0)
1145 tty_port_set_initialized(port, true);
1146 if (ret > 0)
1147 ret = 0;
1148 }
1149out:
1150 mutex_unlock(&port->mutex);
1151 return ret;
1152}
1153
1154static void uart_enable_ms(struct uart_port *uport)
1155{
1156
1157
1158
1159 if (uport->ops->enable_ms)
1160 uport->ops->enable_ms(uport);
1161}
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172static int uart_wait_modem_status(struct uart_state *state, unsigned long arg)
1173{
1174 struct uart_port *uport;
1175 struct tty_port *port = &state->port;
1176 DECLARE_WAITQUEUE(wait, current);
1177 struct uart_icount cprev, cnow;
1178 int ret;
1179
1180
1181
1182
1183 uport = uart_port_ref(state);
1184 if (!uport)
1185 return -EIO;
1186 spin_lock_irq(&uport->lock);
1187 memcpy(&cprev, &uport->icount, sizeof(struct uart_icount));
1188 uart_enable_ms(uport);
1189 spin_unlock_irq(&uport->lock);
1190
1191 add_wait_queue(&port->delta_msr_wait, &wait);
1192 for (;;) {
1193 spin_lock_irq(&uport->lock);
1194 memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
1195 spin_unlock_irq(&uport->lock);
1196
1197 set_current_state(TASK_INTERRUPTIBLE);
1198
1199 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1200 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1201 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1202 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
1203 ret = 0;
1204 break;
1205 }
1206
1207 schedule();
1208
1209
1210 if (signal_pending(current)) {
1211 ret = -ERESTARTSYS;
1212 break;
1213 }
1214
1215 cprev = cnow;
1216 }
1217 __set_current_state(TASK_RUNNING);
1218 remove_wait_queue(&port->delta_msr_wait, &wait);
1219 uart_port_deref(uport);
1220
1221 return ret;
1222}
1223
1224
1225
1226
1227
1228
1229
1230static int uart_get_icount(struct tty_struct *tty,
1231 struct serial_icounter_struct *icount)
1232{
1233 struct uart_state *state = tty->driver_data;
1234 struct uart_icount cnow;
1235 struct uart_port *uport;
1236
1237 uport = uart_port_ref(state);
1238 if (!uport)
1239 return -EIO;
1240 spin_lock_irq(&uport->lock);
1241 memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
1242 spin_unlock_irq(&uport->lock);
1243 uart_port_deref(uport);
1244
1245 icount->cts = cnow.cts;
1246 icount->dsr = cnow.dsr;
1247 icount->rng = cnow.rng;
1248 icount->dcd = cnow.dcd;
1249 icount->rx = cnow.rx;
1250 icount->tx = cnow.tx;
1251 icount->frame = cnow.frame;
1252 icount->overrun = cnow.overrun;
1253 icount->parity = cnow.parity;
1254 icount->brk = cnow.brk;
1255 icount->buf_overrun = cnow.buf_overrun;
1256
1257 return 0;
1258}
1259
1260static int uart_get_rs485_config(struct uart_port *port,
1261 struct serial_rs485 __user *rs485)
1262{
1263 unsigned long flags;
1264 struct serial_rs485 aux;
1265
1266 spin_lock_irqsave(&port->lock, flags);
1267 aux = port->rs485;
1268 spin_unlock_irqrestore(&port->lock, flags);
1269
1270 if (copy_to_user(rs485, &aux, sizeof(aux)))
1271 return -EFAULT;
1272
1273 return 0;
1274}
1275
1276static int uart_set_rs485_config(struct uart_port *port,
1277 struct serial_rs485 __user *rs485_user)
1278{
1279 struct serial_rs485 rs485;
1280 int ret;
1281 unsigned long flags;
1282
1283 if (!port->rs485_config)
1284 return -ENOTTY;
1285
1286 if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user)))
1287 return -EFAULT;
1288
1289 spin_lock_irqsave(&port->lock, flags);
1290 ret = port->rs485_config(port, &rs485);
1291 spin_unlock_irqrestore(&port->lock, flags);
1292 if (ret)
1293 return ret;
1294
1295 if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485)))
1296 return -EFAULT;
1297
1298 return 0;
1299}
1300
1301static int uart_get_iso7816_config(struct uart_port *port,
1302 struct serial_iso7816 __user *iso7816)
1303{
1304 unsigned long flags;
1305 struct serial_iso7816 aux;
1306
1307 if (!port->iso7816_config)
1308 return -ENOTTY;
1309
1310 spin_lock_irqsave(&port->lock, flags);
1311 aux = port->iso7816;
1312 spin_unlock_irqrestore(&port->lock, flags);
1313
1314 if (copy_to_user(iso7816, &aux, sizeof(aux)))
1315 return -EFAULT;
1316
1317 return 0;
1318}
1319
1320static int uart_set_iso7816_config(struct uart_port *port,
1321 struct serial_iso7816 __user *iso7816_user)
1322{
1323 struct serial_iso7816 iso7816;
1324 int i, ret;
1325 unsigned long flags;
1326
1327 if (!port->iso7816_config)
1328 return -ENOTTY;
1329
1330 if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user)))
1331 return -EFAULT;
1332
1333
1334
1335
1336
1337 for (i = 0; i < 5; i++)
1338 if (iso7816.reserved[i])
1339 return -EINVAL;
1340
1341 spin_lock_irqsave(&port->lock, flags);
1342 ret = port->iso7816_config(port, &iso7816);
1343 spin_unlock_irqrestore(&port->lock, flags);
1344 if (ret)
1345 return ret;
1346
1347 if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816)))
1348 return -EFAULT;
1349
1350 return 0;
1351}
1352
1353
1354
1355
1356static int
1357uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
1358{
1359 struct uart_state *state = tty->driver_data;
1360 struct tty_port *port = &state->port;
1361 struct uart_port *uport;
1362 void __user *uarg = (void __user *)arg;
1363 int ret = -ENOIOCTLCMD;
1364
1365
1366
1367
1368
1369 switch (cmd) {
1370 case TIOCSERCONFIG:
1371 down_write(&tty->termios_rwsem);
1372 ret = uart_do_autoconfig(tty, state);
1373 up_write(&tty->termios_rwsem);
1374 break;
1375 }
1376
1377 if (ret != -ENOIOCTLCMD)
1378 goto out;
1379
1380 if (tty_io_error(tty)) {
1381 ret = -EIO;
1382 goto out;
1383 }
1384
1385
1386
1387
1388 switch (cmd) {
1389 case TIOCMIWAIT:
1390 ret = uart_wait_modem_status(state, arg);
1391 break;
1392 }
1393
1394 if (ret != -ENOIOCTLCMD)
1395 goto out;
1396
1397 mutex_lock(&port->mutex);
1398 uport = uart_port_check(state);
1399
1400 if (!uport || tty_io_error(tty)) {
1401 ret = -EIO;
1402 goto out_up;
1403 }
1404
1405
1406
1407
1408
1409
1410 switch (cmd) {
1411 case TIOCSERGETLSR:
1412 ret = uart_get_lsr_info(tty, state, uarg);
1413 break;
1414
1415 case TIOCGRS485:
1416 ret = uart_get_rs485_config(uport, uarg);
1417 break;
1418
1419 case TIOCSRS485:
1420 ret = uart_set_rs485_config(uport, uarg);
1421 break;
1422
1423 case TIOCSISO7816:
1424 ret = uart_set_iso7816_config(state->uart_port, uarg);
1425 break;
1426
1427 case TIOCGISO7816:
1428 ret = uart_get_iso7816_config(state->uart_port, uarg);
1429 break;
1430 default:
1431 if (uport->ops->ioctl)
1432 ret = uport->ops->ioctl(uport, cmd, arg);
1433 break;
1434 }
1435out_up:
1436 mutex_unlock(&port->mutex);
1437out:
1438 return ret;
1439}
1440
1441static void uart_set_ldisc(struct tty_struct *tty)
1442{
1443 struct uart_state *state = tty->driver_data;
1444 struct uart_port *uport;
1445 struct tty_port *port = &state->port;
1446
1447 if (!tty_port_initialized(port))
1448 return;
1449
1450 mutex_lock(&state->port.mutex);
1451 uport = uart_port_check(state);
1452 if (uport && uport->ops->set_ldisc)
1453 uport->ops->set_ldisc(uport, &tty->termios);
1454 mutex_unlock(&state->port.mutex);
1455}
1456
1457static void uart_set_termios(struct tty_struct *tty,
1458 struct ktermios *old_termios)
1459{
1460 struct uart_state *state = tty->driver_data;
1461 struct uart_port *uport;
1462 unsigned int cflag = tty->termios.c_cflag;
1463 unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK;
1464 bool sw_changed = false;
1465
1466 mutex_lock(&state->port.mutex);
1467 uport = uart_port_check(state);
1468 if (!uport)
1469 goto out;
1470
1471
1472
1473
1474
1475 if (uport->flags & UPF_SOFT_FLOW) {
1476 iflag_mask |= IXANY|IXON|IXOFF;
1477 sw_changed =
1478 tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] ||
1479 tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP];
1480 }
1481
1482
1483
1484
1485
1486
1487
1488 if ((cflag ^ old_termios->c_cflag) == 0 &&
1489 tty->termios.c_ospeed == old_termios->c_ospeed &&
1490 tty->termios.c_ispeed == old_termios->c_ispeed &&
1491 ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 &&
1492 !sw_changed) {
1493 goto out;
1494 }
1495
1496 uart_change_speed(tty, state, old_termios);
1497
1498 cflag = tty->termios.c_cflag;
1499
1500
1501 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
1502 uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
1503
1504 else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1505 unsigned int mask = TIOCM_DTR;
1506
1507 if (!(cflag & CRTSCTS) || !tty_throttled(tty))
1508 mask |= TIOCM_RTS;
1509 uart_set_mctrl(uport, mask);
1510 }
1511out:
1512 mutex_unlock(&state->port.mutex);
1513}
1514
1515
1516
1517
1518
1519
1520static void uart_close(struct tty_struct *tty, struct file *filp)
1521{
1522 struct uart_state *state = tty->driver_data;
1523
1524 if (!state) {
1525 struct uart_driver *drv = tty->driver->driver_state;
1526 struct tty_port *port;
1527
1528 state = drv->state + tty->index;
1529 port = &state->port;
1530 spin_lock_irq(&port->lock);
1531 --port->count;
1532 spin_unlock_irq(&port->lock);
1533 return;
1534 }
1535
1536 pr_debug("uart_close(%d) called\n", tty->index);
1537
1538 tty_port_close(tty->port, tty, filp);
1539}
1540
1541static void uart_tty_port_shutdown(struct tty_port *port)
1542{
1543 struct uart_state *state = container_of(port, struct uart_state, port);
1544 struct uart_port *uport = uart_port_check(state);
1545
1546
1547
1548
1549
1550 if (WARN(!uport, "detached port still initialized!\n"))
1551 return;
1552
1553 spin_lock_irq(&uport->lock);
1554 uport->ops->stop_rx(uport);
1555 spin_unlock_irq(&uport->lock);
1556
1557 uart_port_shutdown(port);
1558
1559
1560
1561
1562
1563
1564 tty_port_set_suspended(port, 0);
1565
1566 uart_change_pm(state, UART_PM_STATE_OFF);
1567
1568}
1569
1570static void uart_wait_until_sent(struct tty_struct *tty, int timeout)
1571{
1572 struct uart_state *state = tty->driver_data;
1573 struct uart_port *port;
1574 unsigned long char_time, expire;
1575
1576 port = uart_port_ref(state);
1577 if (!port)
1578 return;
1579
1580 if (port->type == PORT_UNKNOWN || port->fifosize == 0) {
1581 uart_port_deref(port);
1582 return;
1583 }
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593 char_time = (port->timeout - HZ/50) / port->fifosize;
1594 char_time = char_time / 5;
1595 if (char_time == 0)
1596 char_time = 1;
1597 if (timeout && timeout < char_time)
1598 char_time = timeout;
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609 if (timeout == 0 || timeout > 2 * port->timeout)
1610 timeout = 2 * port->timeout;
1611
1612 expire = jiffies + timeout;
1613
1614 pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n",
1615 port->line, jiffies, expire);
1616
1617
1618
1619
1620
1621
1622 while (!port->ops->tx_empty(port)) {
1623 msleep_interruptible(jiffies_to_msecs(char_time));
1624 if (signal_pending(current))
1625 break;
1626 if (time_after(jiffies, expire))
1627 break;
1628 }
1629 uart_port_deref(port);
1630}
1631
1632
1633
1634
1635
1636
1637static void uart_hangup(struct tty_struct *tty)
1638{
1639 struct uart_state *state = tty->driver_data;
1640 struct tty_port *port = &state->port;
1641 struct uart_port *uport;
1642 unsigned long flags;
1643
1644 pr_debug("uart_hangup(%d)\n", tty->index);
1645
1646 mutex_lock(&port->mutex);
1647 uport = uart_port_check(state);
1648 WARN(!uport, "hangup of detached port!\n");
1649
1650 if (tty_port_active(port)) {
1651 uart_flush_buffer(tty);
1652 uart_shutdown(tty, state);
1653 spin_lock_irqsave(&port->lock, flags);
1654 port->count = 0;
1655 spin_unlock_irqrestore(&port->lock, flags);
1656 tty_port_set_active(port, 0);
1657 tty_port_tty_set(port, NULL);
1658 if (uport && !uart_console(uport))
1659 uart_change_pm(state, UART_PM_STATE_OFF);
1660 wake_up_interruptible(&port->open_wait);
1661 wake_up_interruptible(&port->delta_msr_wait);
1662 }
1663 mutex_unlock(&port->mutex);
1664}
1665
1666
1667static void uart_port_shutdown(struct tty_port *port)
1668{
1669 struct uart_state *state = container_of(port, struct uart_state, port);
1670 struct uart_port *uport = uart_port_check(state);
1671
1672
1673
1674
1675
1676
1677
1678
1679 wake_up_interruptible(&port->delta_msr_wait);
1680
1681
1682
1683
1684 if (uport)
1685 uport->ops->shutdown(uport);
1686
1687
1688
1689
1690 if (uport)
1691 synchronize_irq(uport->irq);
1692}
1693
1694static int uart_carrier_raised(struct tty_port *port)
1695{
1696 struct uart_state *state = container_of(port, struct uart_state, port);
1697 struct uart_port *uport;
1698 int mctrl;
1699
1700 uport = uart_port_ref(state);
1701
1702
1703
1704
1705
1706
1707 if (WARN_ON(!uport))
1708 return 1;
1709 spin_lock_irq(&uport->lock);
1710 uart_enable_ms(uport);
1711 mctrl = uport->ops->get_mctrl(uport);
1712 spin_unlock_irq(&uport->lock);
1713 uart_port_deref(uport);
1714 if (mctrl & TIOCM_CAR)
1715 return 1;
1716 return 0;
1717}
1718
1719static void uart_dtr_rts(struct tty_port *port, int raise)
1720{
1721 struct uart_state *state = container_of(port, struct uart_state, port);
1722 struct uart_port *uport;
1723
1724 uport = uart_port_ref(state);
1725 if (!uport)
1726 return;
1727 uart_port_dtr_rts(uport, raise);
1728 uart_port_deref(uport);
1729}
1730
1731static int uart_install(struct tty_driver *driver, struct tty_struct *tty)
1732{
1733 struct uart_driver *drv = driver->driver_state;
1734 struct uart_state *state = drv->state + tty->index;
1735
1736 tty->driver_data = state;
1737
1738 return tty_standard_install(driver, tty);
1739}
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751static int uart_open(struct tty_struct *tty, struct file *filp)
1752{
1753 struct uart_state *state = tty->driver_data;
1754 int retval;
1755
1756 retval = tty_port_open(&state->port, tty, filp);
1757 if (retval > 0)
1758 retval = 0;
1759
1760 return retval;
1761}
1762
1763static int uart_port_activate(struct tty_port *port, struct tty_struct *tty)
1764{
1765 struct uart_state *state = container_of(port, struct uart_state, port);
1766 struct uart_port *uport;
1767 int ret;
1768
1769 uport = uart_port_check(state);
1770 if (!uport || uport->flags & UPF_DEAD)
1771 return -ENXIO;
1772
1773
1774
1775
1776 ret = uart_startup(tty, state, 0);
1777 if (ret > 0)
1778 tty_port_set_active(port, 1);
1779
1780 return ret;
1781}
1782
1783static const char *uart_type(struct uart_port *port)
1784{
1785 const char *str = NULL;
1786
1787 if (port->ops->type)
1788 str = port->ops->type(port);
1789
1790 if (!str)
1791 str = "unknown";
1792
1793 return str;
1794}
1795
1796#ifdef CONFIG_PROC_FS
1797
1798static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i)
1799{
1800 struct uart_state *state = drv->state + i;
1801 struct tty_port *port = &state->port;
1802 enum uart_pm_state pm_state;
1803 struct uart_port *uport;
1804 char stat_buf[32];
1805 unsigned int status;
1806 int mmio;
1807
1808 mutex_lock(&port->mutex);
1809 uport = uart_port_check(state);
1810 if (!uport)
1811 goto out;
1812
1813 mmio = uport->iotype >= UPIO_MEM;
1814 seq_printf(m, "%d: uart:%s %s%08llX irq:%d",
1815 uport->line, uart_type(uport),
1816 mmio ? "mmio:0x" : "port:",
1817 mmio ? (unsigned long long)uport->mapbase
1818 : (unsigned long long)uport->iobase,
1819 uport->irq);
1820
1821 if (uport->type == PORT_UNKNOWN) {
1822 seq_putc(m, '\n');
1823 goto out;
1824 }
1825
1826 if (capable(CAP_SYS_ADMIN)) {
1827 pm_state = state->pm_state;
1828 if (pm_state != UART_PM_STATE_ON)
1829 uart_change_pm(state, UART_PM_STATE_ON);
1830 spin_lock_irq(&uport->lock);
1831 status = uport->ops->get_mctrl(uport);
1832 spin_unlock_irq(&uport->lock);
1833 if (pm_state != UART_PM_STATE_ON)
1834 uart_change_pm(state, pm_state);
1835
1836 seq_printf(m, " tx:%d rx:%d",
1837 uport->icount.tx, uport->icount.rx);
1838 if (uport->icount.frame)
1839 seq_printf(m, " fe:%d", uport->icount.frame);
1840 if (uport->icount.parity)
1841 seq_printf(m, " pe:%d", uport->icount.parity);
1842 if (uport->icount.brk)
1843 seq_printf(m, " brk:%d", uport->icount.brk);
1844 if (uport->icount.overrun)
1845 seq_printf(m, " oe:%d", uport->icount.overrun);
1846 if (uport->icount.buf_overrun)
1847 seq_printf(m, " bo:%d", uport->icount.buf_overrun);
1848
1849#define INFOBIT(bit, str) \
1850 if (uport->mctrl & (bit)) \
1851 strncat(stat_buf, (str), sizeof(stat_buf) - \
1852 strlen(stat_buf) - 2)
1853#define STATBIT(bit, str) \
1854 if (status & (bit)) \
1855 strncat(stat_buf, (str), sizeof(stat_buf) - \
1856 strlen(stat_buf) - 2)
1857
1858 stat_buf[0] = '\0';
1859 stat_buf[1] = '\0';
1860 INFOBIT(TIOCM_RTS, "|RTS");
1861 STATBIT(TIOCM_CTS, "|CTS");
1862 INFOBIT(TIOCM_DTR, "|DTR");
1863 STATBIT(TIOCM_DSR, "|DSR");
1864 STATBIT(TIOCM_CAR, "|CD");
1865 STATBIT(TIOCM_RNG, "|RI");
1866 if (stat_buf[0])
1867 stat_buf[0] = ' ';
1868
1869 seq_puts(m, stat_buf);
1870 }
1871 seq_putc(m, '\n');
1872#undef STATBIT
1873#undef INFOBIT
1874out:
1875 mutex_unlock(&port->mutex);
1876}
1877
1878static int uart_proc_show(struct seq_file *m, void *v)
1879{
1880 struct tty_driver *ttydrv = m->private;
1881 struct uart_driver *drv = ttydrv->driver_state;
1882 int i;
1883
1884 seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", "");
1885 for (i = 0; i < drv->nr; i++)
1886 uart_line_info(m, drv, i);
1887 return 0;
1888}
1889#endif
1890
1891static inline bool uart_console_enabled(struct uart_port *port)
1892{
1893 return uart_console(port) && (port->cons->flags & CON_ENABLED);
1894}
1895
1896static void uart_port_spin_lock_init(struct uart_port *port)
1897{
1898 spin_lock_init(&port->lock);
1899 lockdep_set_class(&port->lock, &port_lock_key);
1900}
1901
1902#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
1903
1904
1905
1906
1907
1908
1909
1910void uart_console_write(struct uart_port *port, const char *s,
1911 unsigned int count,
1912 void (*putchar)(struct uart_port *, int))
1913{
1914 unsigned int i;
1915
1916 for (i = 0; i < count; i++, s++) {
1917 if (*s == '\n')
1918 putchar(port, '\r');
1919 putchar(port, *s);
1920 }
1921}
1922EXPORT_SYMBOL_GPL(uart_console_write);
1923
1924
1925
1926
1927
1928
1929struct uart_port * __init
1930uart_get_console(struct uart_port *ports, int nr, struct console *co)
1931{
1932 int idx = co->index;
1933
1934 if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 &&
1935 ports[idx].membase == NULL))
1936 for (idx = 0; idx < nr; idx++)
1937 if (ports[idx].iobase != 0 ||
1938 ports[idx].membase != NULL)
1939 break;
1940
1941 co->index = idx;
1942
1943 return ports + idx;
1944}
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
1967 char **options)
1968{
1969 if (strncmp(p, "mmio,", 5) == 0) {
1970 *iotype = UPIO_MEM;
1971 p += 5;
1972 } else if (strncmp(p, "mmio16,", 7) == 0) {
1973 *iotype = UPIO_MEM16;
1974 p += 7;
1975 } else if (strncmp(p, "mmio32,", 7) == 0) {
1976 *iotype = UPIO_MEM32;
1977 p += 7;
1978 } else if (strncmp(p, "mmio32be,", 9) == 0) {
1979 *iotype = UPIO_MEM32BE;
1980 p += 9;
1981 } else if (strncmp(p, "mmio32native,", 13) == 0) {
1982 *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ?
1983 UPIO_MEM32BE : UPIO_MEM32;
1984 p += 13;
1985 } else if (strncmp(p, "io,", 3) == 0) {
1986 *iotype = UPIO_PORT;
1987 p += 3;
1988 } else if (strncmp(p, "0x", 2) == 0) {
1989 *iotype = UPIO_MEM;
1990 } else {
1991 return -EINVAL;
1992 }
1993
1994
1995
1996
1997
1998 *addr = simple_strtoull(p, NULL, 0);
1999 p = strchr(p, ',');
2000 if (p)
2001 p++;
2002
2003 *options = p;
2004 return 0;
2005}
2006EXPORT_SYMBOL_GPL(uart_parse_earlycon);
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020void
2021uart_parse_options(const char *options, int *baud, int *parity,
2022 int *bits, int *flow)
2023{
2024 const char *s = options;
2025
2026 *baud = simple_strtoul(s, NULL, 10);
2027 while (*s >= '0' && *s <= '9')
2028 s++;
2029 if (*s)
2030 *parity = *s++;
2031 if (*s)
2032 *bits = *s++ - '0';
2033 if (*s)
2034 *flow = *s;
2035}
2036EXPORT_SYMBOL_GPL(uart_parse_options);
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047int
2048uart_set_options(struct uart_port *port, struct console *co,
2049 int baud, int parity, int bits, int flow)
2050{
2051 struct ktermios termios;
2052 static struct ktermios dummy;
2053
2054
2055
2056
2057
2058
2059
2060
2061 if (!uart_console_enabled(port) && !port->console_reinit)
2062 uart_port_spin_lock_init(port);
2063
2064 memset(&termios, 0, sizeof(struct ktermios));
2065
2066 termios.c_cflag |= CREAD | HUPCL | CLOCAL;
2067 tty_termios_encode_baud_rate(&termios, baud, baud);
2068
2069 if (bits == 7)
2070 termios.c_cflag |= CS7;
2071 else
2072 termios.c_cflag |= CS8;
2073
2074 switch (parity) {
2075 case 'o': case 'O':
2076 termios.c_cflag |= PARODD;
2077 fallthrough;
2078 case 'e': case 'E':
2079 termios.c_cflag |= PARENB;
2080 break;
2081 }
2082
2083 if (flow == 'r')
2084 termios.c_cflag |= CRTSCTS;
2085
2086
2087
2088
2089
2090 port->mctrl |= TIOCM_DTR;
2091
2092 port->ops->set_termios(port, &termios, &dummy);
2093
2094
2095
2096
2097 if (co)
2098 co->cflag = termios.c_cflag;
2099
2100 return 0;
2101}
2102EXPORT_SYMBOL_GPL(uart_set_options);
2103#endif
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113static void uart_change_pm(struct uart_state *state,
2114 enum uart_pm_state pm_state)
2115{
2116 struct uart_port *port = uart_port_check(state);
2117
2118 if (state->pm_state != pm_state) {
2119 if (port && port->ops->pm)
2120 port->ops->pm(port, pm_state, state->pm_state);
2121 state->pm_state = pm_state;
2122 }
2123}
2124
2125struct uart_match {
2126 struct uart_port *port;
2127 struct uart_driver *driver;
2128};
2129
2130static int serial_match_port(struct device *dev, void *data)
2131{
2132 struct uart_match *match = data;
2133 struct tty_driver *tty_drv = match->driver->tty_driver;
2134 dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) +
2135 match->port->line;
2136
2137 return dev->devt == devt;
2138}
2139
2140int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
2141{
2142 struct uart_state *state = drv->state + uport->line;
2143 struct tty_port *port = &state->port;
2144 struct device *tty_dev;
2145 struct uart_match match = {uport, drv};
2146
2147 mutex_lock(&port->mutex);
2148
2149 tty_dev = device_find_child(uport->dev, &match, serial_match_port);
2150 if (tty_dev && device_may_wakeup(tty_dev)) {
2151 enable_irq_wake(uport->irq);
2152 put_device(tty_dev);
2153 mutex_unlock(&port->mutex);
2154 return 0;
2155 }
2156 put_device(tty_dev);
2157
2158
2159 if (!console_suspend_enabled && uart_console(uport))
2160 goto unlock;
2161
2162 uport->suspended = 1;
2163
2164 if (tty_port_initialized(port)) {
2165 const struct uart_ops *ops = uport->ops;
2166 int tries;
2167
2168 tty_port_set_suspended(port, 1);
2169 tty_port_set_initialized(port, 0);
2170
2171 spin_lock_irq(&uport->lock);
2172 ops->stop_tx(uport);
2173 ops->set_mctrl(uport, 0);
2174 ops->stop_rx(uport);
2175 spin_unlock_irq(&uport->lock);
2176
2177
2178
2179
2180 for (tries = 3; !ops->tx_empty(uport) && tries; tries--)
2181 msleep(10);
2182 if (!tries)
2183 dev_err(uport->dev, "%s: Unable to drain transmitter\n",
2184 uport->name);
2185
2186 ops->shutdown(uport);
2187 }
2188
2189
2190
2191
2192 if (uart_console(uport))
2193 console_stop(uport->cons);
2194
2195 uart_change_pm(state, UART_PM_STATE_OFF);
2196unlock:
2197 mutex_unlock(&port->mutex);
2198
2199 return 0;
2200}
2201
2202int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
2203{
2204 struct uart_state *state = drv->state + uport->line;
2205 struct tty_port *port = &state->port;
2206 struct device *tty_dev;
2207 struct uart_match match = {uport, drv};
2208 struct ktermios termios;
2209
2210 mutex_lock(&port->mutex);
2211
2212 tty_dev = device_find_child(uport->dev, &match, serial_match_port);
2213 if (!uport->suspended && device_may_wakeup(tty_dev)) {
2214 if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq))))
2215 disable_irq_wake(uport->irq);
2216 put_device(tty_dev);
2217 mutex_unlock(&port->mutex);
2218 return 0;
2219 }
2220 put_device(tty_dev);
2221 uport->suspended = 0;
2222
2223
2224
2225
2226 if (uart_console(uport)) {
2227
2228
2229
2230 memset(&termios, 0, sizeof(struct ktermios));
2231 termios.c_cflag = uport->cons->cflag;
2232
2233
2234
2235
2236 if (port->tty && termios.c_cflag == 0)
2237 termios = port->tty->termios;
2238
2239 if (console_suspend_enabled)
2240 uart_change_pm(state, UART_PM_STATE_ON);
2241 uport->ops->set_termios(uport, &termios, NULL);
2242 if (console_suspend_enabled)
2243 console_start(uport->cons);
2244 }
2245
2246 if (tty_port_suspended(port)) {
2247 const struct uart_ops *ops = uport->ops;
2248 int ret;
2249
2250 uart_change_pm(state, UART_PM_STATE_ON);
2251 spin_lock_irq(&uport->lock);
2252 ops->set_mctrl(uport, 0);
2253 spin_unlock_irq(&uport->lock);
2254 if (console_suspend_enabled || !uart_console(uport)) {
2255
2256 struct tty_struct *tty = port->tty;
2257
2258 ret = ops->startup(uport);
2259 if (ret == 0) {
2260 if (tty)
2261 uart_change_speed(tty, state, NULL);
2262 spin_lock_irq(&uport->lock);
2263 ops->set_mctrl(uport, uport->mctrl);
2264 ops->start_tx(uport);
2265 spin_unlock_irq(&uport->lock);
2266 tty_port_set_initialized(port, 1);
2267 } else {
2268
2269
2270
2271
2272
2273 uart_shutdown(tty, state);
2274 }
2275 }
2276
2277 tty_port_set_suspended(port, 0);
2278 }
2279
2280 mutex_unlock(&port->mutex);
2281
2282 return 0;
2283}
2284
2285static inline void
2286uart_report_port(struct uart_driver *drv, struct uart_port *port)
2287{
2288 char address[64];
2289
2290 switch (port->iotype) {
2291 case UPIO_PORT:
2292 snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase);
2293 break;
2294 case UPIO_HUB6:
2295 snprintf(address, sizeof(address),
2296 "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
2297 break;
2298 case UPIO_MEM:
2299 case UPIO_MEM16:
2300 case UPIO_MEM32:
2301 case UPIO_MEM32BE:
2302 case UPIO_AU:
2303 case UPIO_TSI:
2304 snprintf(address, sizeof(address),
2305 "MMIO 0x%llx", (unsigned long long)port->mapbase);
2306 break;
2307 default:
2308 strlcpy(address, "*unknown*", sizeof(address));
2309 break;
2310 }
2311
2312 pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n",
2313 port->dev ? dev_name(port->dev) : "",
2314 port->dev ? ": " : "",
2315 port->name,
2316 address, port->irq, port->uartclk / 16, uart_type(port));
2317
2318
2319 if (port->flags & UPF_MAGIC_MULTIPLIER)
2320 pr_info("%s%s%s extra baud rates supported: %d, %d",
2321 port->dev ? dev_name(port->dev) : "",
2322 port->dev ? ": " : "",
2323 port->name,
2324 port->uartclk / 8, port->uartclk / 4);
2325}
2326
2327static void
2328uart_configure_port(struct uart_driver *drv, struct uart_state *state,
2329 struct uart_port *port)
2330{
2331 unsigned int flags;
2332
2333
2334
2335
2336 if (!port->iobase && !port->mapbase && !port->membase)
2337 return;
2338
2339
2340
2341
2342
2343 flags = 0;
2344 if (port->flags & UPF_AUTO_IRQ)
2345 flags |= UART_CONFIG_IRQ;
2346 if (port->flags & UPF_BOOT_AUTOCONF) {
2347 if (!(port->flags & UPF_FIXED_TYPE)) {
2348 port->type = PORT_UNKNOWN;
2349 flags |= UART_CONFIG_TYPE;
2350 }
2351 port->ops->config_port(port, flags);
2352 }
2353
2354 if (port->type != PORT_UNKNOWN) {
2355 unsigned long flags;
2356
2357 uart_report_port(drv, port);
2358
2359
2360 uart_change_pm(state, UART_PM_STATE_ON);
2361
2362
2363
2364
2365
2366
2367 spin_lock_irqsave(&port->lock, flags);
2368 port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR);
2369 spin_unlock_irqrestore(&port->lock, flags);
2370
2371
2372
2373
2374
2375
2376 if (port->cons && !(port->cons->flags & CON_ENABLED))
2377 register_console(port->cons);
2378
2379
2380
2381
2382
2383 if (!uart_console(port))
2384 uart_change_pm(state, UART_PM_STATE_OFF);
2385 }
2386}
2387
2388#ifdef CONFIG_CONSOLE_POLL
2389
2390static int uart_poll_init(struct tty_driver *driver, int line, char *options)
2391{
2392 struct uart_driver *drv = driver->driver_state;
2393 struct uart_state *state = drv->state + line;
2394 struct tty_port *tport;
2395 struct uart_port *port;
2396 int baud = 9600;
2397 int bits = 8;
2398 int parity = 'n';
2399 int flow = 'n';
2400 int ret = 0;
2401
2402 tport = &state->port;
2403 mutex_lock(&tport->mutex);
2404
2405 port = uart_port_check(state);
2406 if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) {
2407 ret = -1;
2408 goto out;
2409 }
2410
2411 if (port->ops->poll_init) {
2412
2413
2414
2415
2416 if (!tty_port_initialized(tport))
2417 ret = port->ops->poll_init(port);
2418 }
2419
2420 if (!ret && options) {
2421 uart_parse_options(options, &baud, &parity, &bits, &flow);
2422 ret = uart_set_options(port, NULL, baud, parity, bits, flow);
2423 }
2424out:
2425 mutex_unlock(&tport->mutex);
2426 return ret;
2427}
2428
2429static int uart_poll_get_char(struct tty_driver *driver, int line)
2430{
2431 struct uart_driver *drv = driver->driver_state;
2432 struct uart_state *state = drv->state + line;
2433 struct uart_port *port;
2434 int ret = -1;
2435
2436 port = uart_port_ref(state);
2437 if (port) {
2438 ret = port->ops->poll_get_char(port);
2439 uart_port_deref(port);
2440 }
2441
2442 return ret;
2443}
2444
2445static void uart_poll_put_char(struct tty_driver *driver, int line, char ch)
2446{
2447 struct uart_driver *drv = driver->driver_state;
2448 struct uart_state *state = drv->state + line;
2449 struct uart_port *port;
2450
2451 port = uart_port_ref(state);
2452 if (!port)
2453 return;
2454
2455 if (ch == '\n')
2456 port->ops->poll_put_char(port, '\r');
2457 port->ops->poll_put_char(port, ch);
2458 uart_port_deref(port);
2459}
2460#endif
2461
2462static const struct tty_operations uart_ops = {
2463 .install = uart_install,
2464 .open = uart_open,
2465 .close = uart_close,
2466 .write = uart_write,
2467 .put_char = uart_put_char,
2468 .flush_chars = uart_flush_chars,
2469 .write_room = uart_write_room,
2470 .chars_in_buffer= uart_chars_in_buffer,
2471 .flush_buffer = uart_flush_buffer,
2472 .ioctl = uart_ioctl,
2473 .throttle = uart_throttle,
2474 .unthrottle = uart_unthrottle,
2475 .send_xchar = uart_send_xchar,
2476 .set_termios = uart_set_termios,
2477 .set_ldisc = uart_set_ldisc,
2478 .stop = uart_stop,
2479 .start = uart_start,
2480 .hangup = uart_hangup,
2481 .break_ctl = uart_break_ctl,
2482 .wait_until_sent= uart_wait_until_sent,
2483#ifdef CONFIG_PROC_FS
2484 .proc_show = uart_proc_show,
2485#endif
2486 .tiocmget = uart_tiocmget,
2487 .tiocmset = uart_tiocmset,
2488 .set_serial = uart_set_info_user,
2489 .get_serial = uart_get_info_user,
2490 .get_icount = uart_get_icount,
2491#ifdef CONFIG_CONSOLE_POLL
2492 .poll_init = uart_poll_init,
2493 .poll_get_char = uart_poll_get_char,
2494 .poll_put_char = uart_poll_put_char,
2495#endif
2496};
2497
2498static const struct tty_port_operations uart_port_ops = {
2499 .carrier_raised = uart_carrier_raised,
2500 .dtr_rts = uart_dtr_rts,
2501 .activate = uart_port_activate,
2502 .shutdown = uart_tty_port_shutdown,
2503};
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518int uart_register_driver(struct uart_driver *drv)
2519{
2520 struct tty_driver *normal;
2521 int i, retval = -ENOMEM;
2522
2523 BUG_ON(drv->state);
2524
2525
2526
2527
2528
2529 drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL);
2530 if (!drv->state)
2531 goto out;
2532
2533 normal = tty_alloc_driver(drv->nr, TTY_DRIVER_REAL_RAW |
2534 TTY_DRIVER_DYNAMIC_DEV);
2535 if (IS_ERR(normal)) {
2536 retval = PTR_ERR(normal);
2537 goto out_kfree;
2538 }
2539
2540 drv->tty_driver = normal;
2541
2542 normal->driver_name = drv->driver_name;
2543 normal->name = drv->dev_name;
2544 normal->major = drv->major;
2545 normal->minor_start = drv->minor;
2546 normal->type = TTY_DRIVER_TYPE_SERIAL;
2547 normal->subtype = SERIAL_TYPE_NORMAL;
2548 normal->init_termios = tty_std_termios;
2549 normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2550 normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600;
2551 normal->driver_state = drv;
2552 tty_set_operations(normal, &uart_ops);
2553
2554
2555
2556
2557 for (i = 0; i < drv->nr; i++) {
2558 struct uart_state *state = drv->state + i;
2559 struct tty_port *port = &state->port;
2560
2561 tty_port_init(port);
2562 port->ops = &uart_port_ops;
2563 }
2564
2565 retval = tty_register_driver(normal);
2566 if (retval >= 0)
2567 return retval;
2568
2569 for (i = 0; i < drv->nr; i++)
2570 tty_port_destroy(&drv->state[i].port);
2571 tty_driver_kref_put(normal);
2572out_kfree:
2573 kfree(drv->state);
2574out:
2575 return retval;
2576}
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587void uart_unregister_driver(struct uart_driver *drv)
2588{
2589 struct tty_driver *p = drv->tty_driver;
2590 unsigned int i;
2591
2592 tty_unregister_driver(p);
2593 tty_driver_kref_put(p);
2594 for (i = 0; i < drv->nr; i++)
2595 tty_port_destroy(&drv->state[i].port);
2596 kfree(drv->state);
2597 drv->state = NULL;
2598 drv->tty_driver = NULL;
2599}
2600
2601struct tty_driver *uart_console_device(struct console *co, int *index)
2602{
2603 struct uart_driver *p = co->data;
2604 *index = co->index;
2605 return p->tty_driver;
2606}
2607EXPORT_SYMBOL_GPL(uart_console_device);
2608
2609static ssize_t uartclk_show(struct device *dev,
2610 struct device_attribute *attr, char *buf)
2611{
2612 struct serial_struct tmp;
2613 struct tty_port *port = dev_get_drvdata(dev);
2614
2615 uart_get_info(port, &tmp);
2616 return sprintf(buf, "%d\n", tmp.baud_base * 16);
2617}
2618
2619static ssize_t type_show(struct device *dev,
2620 struct device_attribute *attr, char *buf)
2621{
2622 struct serial_struct tmp;
2623 struct tty_port *port = dev_get_drvdata(dev);
2624
2625 uart_get_info(port, &tmp);
2626 return sprintf(buf, "%d\n", tmp.type);
2627}
2628
2629static ssize_t line_show(struct device *dev,
2630 struct device_attribute *attr, char *buf)
2631{
2632 struct serial_struct tmp;
2633 struct tty_port *port = dev_get_drvdata(dev);
2634
2635 uart_get_info(port, &tmp);
2636 return sprintf(buf, "%d\n", tmp.line);
2637}
2638
2639static ssize_t port_show(struct device *dev,
2640 struct device_attribute *attr, char *buf)
2641{
2642 struct serial_struct tmp;
2643 struct tty_port *port = dev_get_drvdata(dev);
2644 unsigned long ioaddr;
2645
2646 uart_get_info(port, &tmp);
2647 ioaddr = tmp.port;
2648 if (HIGH_BITS_OFFSET)
2649 ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET;
2650 return sprintf(buf, "0x%lX\n", ioaddr);
2651}
2652
2653static ssize_t irq_show(struct device *dev,
2654 struct device_attribute *attr, char *buf)
2655{
2656 struct serial_struct tmp;
2657 struct tty_port *port = dev_get_drvdata(dev);
2658
2659 uart_get_info(port, &tmp);
2660 return sprintf(buf, "%d\n", tmp.irq);
2661}
2662
2663static ssize_t flags_show(struct device *dev,
2664 struct device_attribute *attr, char *buf)
2665{
2666 struct serial_struct tmp;
2667 struct tty_port *port = dev_get_drvdata(dev);
2668
2669 uart_get_info(port, &tmp);
2670 return sprintf(buf, "0x%X\n", tmp.flags);
2671}
2672
2673static ssize_t xmit_fifo_size_show(struct device *dev,
2674 struct device_attribute *attr, char *buf)
2675{
2676 struct serial_struct tmp;
2677 struct tty_port *port = dev_get_drvdata(dev);
2678
2679 uart_get_info(port, &tmp);
2680 return sprintf(buf, "%d\n", tmp.xmit_fifo_size);
2681}
2682
2683static ssize_t close_delay_show(struct device *dev,
2684 struct device_attribute *attr, char *buf)
2685{
2686 struct serial_struct tmp;
2687 struct tty_port *port = dev_get_drvdata(dev);
2688
2689 uart_get_info(port, &tmp);
2690 return sprintf(buf, "%d\n", tmp.close_delay);
2691}
2692
2693static ssize_t closing_wait_show(struct device *dev,
2694 struct device_attribute *attr, char *buf)
2695{
2696 struct serial_struct tmp;
2697 struct tty_port *port = dev_get_drvdata(dev);
2698
2699 uart_get_info(port, &tmp);
2700 return sprintf(buf, "%d\n", tmp.closing_wait);
2701}
2702
2703static ssize_t custom_divisor_show(struct device *dev,
2704 struct device_attribute *attr, char *buf)
2705{
2706 struct serial_struct tmp;
2707 struct tty_port *port = dev_get_drvdata(dev);
2708
2709 uart_get_info(port, &tmp);
2710 return sprintf(buf, "%d\n", tmp.custom_divisor);
2711}
2712
2713static ssize_t io_type_show(struct device *dev,
2714 struct device_attribute *attr, char *buf)
2715{
2716 struct serial_struct tmp;
2717 struct tty_port *port = dev_get_drvdata(dev);
2718
2719 uart_get_info(port, &tmp);
2720 return sprintf(buf, "%d\n", tmp.io_type);
2721}
2722
2723static ssize_t iomem_base_show(struct device *dev,
2724 struct device_attribute *attr, char *buf)
2725{
2726 struct serial_struct tmp;
2727 struct tty_port *port = dev_get_drvdata(dev);
2728
2729 uart_get_info(port, &tmp);
2730 return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base);
2731}
2732
2733static ssize_t iomem_reg_shift_show(struct device *dev,
2734 struct device_attribute *attr, char *buf)
2735{
2736 struct serial_struct tmp;
2737 struct tty_port *port = dev_get_drvdata(dev);
2738
2739 uart_get_info(port, &tmp);
2740 return sprintf(buf, "%d\n", tmp.iomem_reg_shift);
2741}
2742
2743static ssize_t console_show(struct device *dev,
2744 struct device_attribute *attr, char *buf)
2745{
2746 struct tty_port *port = dev_get_drvdata(dev);
2747 struct uart_state *state = container_of(port, struct uart_state, port);
2748 struct uart_port *uport;
2749 bool console = false;
2750
2751 mutex_lock(&port->mutex);
2752 uport = uart_port_check(state);
2753 if (uport)
2754 console = uart_console_enabled(uport);
2755 mutex_unlock(&port->mutex);
2756
2757 return sprintf(buf, "%c\n", console ? 'Y' : 'N');
2758}
2759
2760static ssize_t console_store(struct device *dev,
2761 struct device_attribute *attr, const char *buf, size_t count)
2762{
2763 struct tty_port *port = dev_get_drvdata(dev);
2764 struct uart_state *state = container_of(port, struct uart_state, port);
2765 struct uart_port *uport;
2766 bool oldconsole, newconsole;
2767 int ret;
2768
2769 ret = kstrtobool(buf, &newconsole);
2770 if (ret)
2771 return ret;
2772
2773 mutex_lock(&port->mutex);
2774 uport = uart_port_check(state);
2775 if (uport) {
2776 oldconsole = uart_console_enabled(uport);
2777 if (oldconsole && !newconsole) {
2778 ret = unregister_console(uport->cons);
2779 } else if (!oldconsole && newconsole) {
2780 if (uart_console(uport)) {
2781 uport->console_reinit = 1;
2782 register_console(uport->cons);
2783 } else {
2784 ret = -ENOENT;
2785 }
2786 }
2787 } else {
2788 ret = -ENXIO;
2789 }
2790 mutex_unlock(&port->mutex);
2791
2792 return ret < 0 ? ret : count;
2793}
2794
2795static DEVICE_ATTR_RO(uartclk);
2796static DEVICE_ATTR_RO(type);
2797static DEVICE_ATTR_RO(line);
2798static DEVICE_ATTR_RO(port);
2799static DEVICE_ATTR_RO(irq);
2800static DEVICE_ATTR_RO(flags);
2801static DEVICE_ATTR_RO(xmit_fifo_size);
2802static DEVICE_ATTR_RO(close_delay);
2803static DEVICE_ATTR_RO(closing_wait);
2804static DEVICE_ATTR_RO(custom_divisor);
2805static DEVICE_ATTR_RO(io_type);
2806static DEVICE_ATTR_RO(iomem_base);
2807static DEVICE_ATTR_RO(iomem_reg_shift);
2808static DEVICE_ATTR_RW(console);
2809
2810static struct attribute *tty_dev_attrs[] = {
2811 &dev_attr_uartclk.attr,
2812 &dev_attr_type.attr,
2813 &dev_attr_line.attr,
2814 &dev_attr_port.attr,
2815 &dev_attr_irq.attr,
2816 &dev_attr_flags.attr,
2817 &dev_attr_xmit_fifo_size.attr,
2818 &dev_attr_close_delay.attr,
2819 &dev_attr_closing_wait.attr,
2820 &dev_attr_custom_divisor.attr,
2821 &dev_attr_io_type.attr,
2822 &dev_attr_iomem_base.attr,
2823 &dev_attr_iomem_reg_shift.attr,
2824 &dev_attr_console.attr,
2825 NULL
2826};
2827
2828static const struct attribute_group tty_dev_attr_group = {
2829 .attrs = tty_dev_attrs,
2830};
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
2845{
2846 struct uart_state *state;
2847 struct tty_port *port;
2848 int ret = 0;
2849 struct device *tty_dev;
2850 int num_groups;
2851
2852 if (uport->line >= drv->nr)
2853 return -EINVAL;
2854
2855 state = drv->state + uport->line;
2856 port = &state->port;
2857
2858 mutex_lock(&port_mutex);
2859 mutex_lock(&port->mutex);
2860 if (state->uart_port) {
2861 ret = -EINVAL;
2862 goto out;
2863 }
2864
2865
2866 atomic_set(&state->refcount, 1);
2867 init_waitqueue_head(&state->remove_wait);
2868 state->uart_port = uport;
2869 uport->state = state;
2870
2871 state->pm_state = UART_PM_STATE_UNDEFINED;
2872 uport->cons = drv->cons;
2873 uport->minor = drv->tty_driver->minor_start + uport->line;
2874 uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name,
2875 drv->tty_driver->name_base + uport->line);
2876 if (!uport->name) {
2877 ret = -ENOMEM;
2878 goto out;
2879 }
2880
2881
2882
2883
2884
2885 if (!uart_console_enabled(uport))
2886 uart_port_spin_lock_init(uport);
2887
2888 if (uport->cons && uport->dev)
2889 of_console_check(uport->dev->of_node, uport->cons->name, uport->line);
2890
2891 tty_port_link_device(port, drv->tty_driver, uport->line);
2892 uart_configure_port(drv, state, uport);
2893
2894 port->console = uart_console(uport);
2895
2896 num_groups = 2;
2897 if (uport->attr_group)
2898 num_groups++;
2899
2900 uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups),
2901 GFP_KERNEL);
2902 if (!uport->tty_groups) {
2903 ret = -ENOMEM;
2904 goto out;
2905 }
2906 uport->tty_groups[0] = &tty_dev_attr_group;
2907 if (uport->attr_group)
2908 uport->tty_groups[1] = uport->attr_group;
2909
2910
2911
2912
2913
2914 tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver,
2915 uport->line, uport->dev, port, uport->tty_groups);
2916 if (!IS_ERR(tty_dev)) {
2917 device_set_wakeup_capable(tty_dev, 1);
2918 } else {
2919 dev_err(uport->dev, "Cannot register tty device on line %d\n",
2920 uport->line);
2921 }
2922
2923
2924
2925
2926 uport->flags &= ~UPF_DEAD;
2927
2928 out:
2929 mutex_unlock(&port->mutex);
2930 mutex_unlock(&port_mutex);
2931
2932 return ret;
2933}
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
2947{
2948 struct uart_state *state = drv->state + uport->line;
2949 struct tty_port *port = &state->port;
2950 struct uart_port *uart_port;
2951 struct tty_struct *tty;
2952 int ret = 0;
2953
2954 mutex_lock(&port_mutex);
2955
2956
2957
2958
2959
2960 mutex_lock(&port->mutex);
2961 uart_port = uart_port_check(state);
2962 if (uart_port != uport)
2963 dev_alert(uport->dev, "Removing wrong port: %p != %p\n",
2964 uart_port, uport);
2965
2966 if (!uart_port) {
2967 mutex_unlock(&port->mutex);
2968 ret = -EINVAL;
2969 goto out;
2970 }
2971 uport->flags |= UPF_DEAD;
2972 mutex_unlock(&port->mutex);
2973
2974
2975
2976
2977 tty_port_unregister_device(port, drv->tty_driver, uport->line);
2978
2979 tty = tty_port_tty_get(port);
2980 if (tty) {
2981 tty_vhangup(port->tty);
2982 tty_kref_put(tty);
2983 }
2984
2985
2986
2987
2988 if (uart_console(uport))
2989 unregister_console(uport->cons);
2990
2991
2992
2993
2994 if (uport->type != PORT_UNKNOWN && uport->ops->release_port)
2995 uport->ops->release_port(uport);
2996 kfree(uport->tty_groups);
2997 kfree(uport->name);
2998
2999
3000
3001
3002 uport->type = PORT_UNKNOWN;
3003
3004 mutex_lock(&port->mutex);
3005 WARN_ON(atomic_dec_return(&state->refcount) < 0);
3006 wait_event(state->remove_wait, !atomic_read(&state->refcount));
3007 state->uart_port = NULL;
3008 mutex_unlock(&port->mutex);
3009out:
3010 mutex_unlock(&port_mutex);
3011
3012 return ret;
3013}
3014
3015
3016
3017
3018bool uart_match_port(const struct uart_port *port1,
3019 const struct uart_port *port2)
3020{
3021 if (port1->iotype != port2->iotype)
3022 return false;
3023
3024 switch (port1->iotype) {
3025 case UPIO_PORT:
3026 return port1->iobase == port2->iobase;
3027 case UPIO_HUB6:
3028 return port1->iobase == port2->iobase &&
3029 port1->hub6 == port2->hub6;
3030 case UPIO_MEM:
3031 case UPIO_MEM16:
3032 case UPIO_MEM32:
3033 case UPIO_MEM32BE:
3034 case UPIO_AU:
3035 case UPIO_TSI:
3036 return port1->mapbase == port2->mapbase;
3037 }
3038
3039 return false;
3040}
3041EXPORT_SYMBOL(uart_match_port);
3042
3043
3044
3045
3046
3047
3048
3049
3050void uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
3051{
3052 struct tty_port *port = &uport->state->port;
3053 struct tty_struct *tty = port->tty;
3054 struct tty_ldisc *ld;
3055
3056 lockdep_assert_held_once(&uport->lock);
3057
3058 if (tty) {
3059 ld = tty_ldisc_ref(tty);
3060 if (ld) {
3061 if (ld->ops->dcd_change)
3062 ld->ops->dcd_change(tty, status);
3063 tty_ldisc_deref(ld);
3064 }
3065 }
3066
3067 uport->icount.dcd++;
3068
3069 if (uart_dcd_enabled(uport)) {
3070 if (status)
3071 wake_up_interruptible(&port->open_wait);
3072 else if (tty)
3073 tty_hangup(tty);
3074 }
3075}
3076EXPORT_SYMBOL_GPL(uart_handle_dcd_change);
3077
3078
3079
3080
3081
3082
3083
3084
3085void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
3086{
3087 lockdep_assert_held_once(&uport->lock);
3088
3089 uport->icount.cts++;
3090
3091 if (uart_softcts_mode(uport)) {
3092 if (uport->hw_stopped) {
3093 if (status) {
3094 uport->hw_stopped = 0;
3095 uport->ops->start_tx(uport);
3096 uart_write_wakeup(uport);
3097 }
3098 } else {
3099 if (!status) {
3100 uport->hw_stopped = 1;
3101 uport->ops->stop_tx(uport);
3102 }
3103 }
3104
3105 }
3106}
3107EXPORT_SYMBOL_GPL(uart_handle_cts_change);
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121void uart_insert_char(struct uart_port *port, unsigned int status,
3122 unsigned int overrun, unsigned int ch, unsigned int flag)
3123{
3124 struct tty_port *tport = &port->state->port;
3125
3126 if ((status & port->ignore_status_mask & ~overrun) == 0)
3127 if (tty_insert_flip_char(tport, ch, flag) == 0)
3128 ++port->icount.buf_overrun;
3129
3130
3131
3132
3133
3134 if (status & ~port->ignore_status_mask & overrun)
3135 if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0)
3136 ++port->icount.buf_overrun;
3137}
3138EXPORT_SYMBOL_GPL(uart_insert_char);
3139
3140#ifdef CONFIG_MAGIC_SYSRQ_SERIAL
3141static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE;
3142
3143static void uart_sysrq_on(struct work_struct *w)
3144{
3145 int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq);
3146
3147 sysrq_toggle_support(1);
3148 pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n",
3149 sysrq_toggle_seq_len, sysrq_toggle_seq);
3150}
3151static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on);
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch)
3165{
3166 int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq);
3167
3168 if (!sysrq_toggle_seq_len)
3169 return false;
3170
3171 BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX);
3172 if (sysrq_toggle_seq[port->sysrq_seq] != ch) {
3173 port->sysrq_seq = 0;
3174 return false;
3175 }
3176
3177 if (++port->sysrq_seq < sysrq_toggle_seq_len) {
3178 port->sysrq = jiffies + SYSRQ_TIMEOUT;
3179 return true;
3180 }
3181
3182 schedule_work(&sysrq_enable_work);
3183
3184 port->sysrq = 0;
3185 return true;
3186}
3187EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq);
3188#endif
3189
3190EXPORT_SYMBOL(uart_write_wakeup);
3191EXPORT_SYMBOL(uart_register_driver);
3192EXPORT_SYMBOL(uart_unregister_driver);
3193EXPORT_SYMBOL(uart_suspend_port);
3194EXPORT_SYMBOL(uart_resume_port);
3195EXPORT_SYMBOL(uart_add_one_port);
3196EXPORT_SYMBOL(uart_remove_one_port);
3197
3198
3199
3200
3201
3202
3203
3204
3205int uart_get_rs485_mode(struct uart_port *port)
3206{
3207 struct serial_rs485 *rs485conf = &port->rs485;
3208 struct device *dev = port->dev;
3209 u32 rs485_delay[2];
3210 int ret;
3211
3212 ret = device_property_read_u32_array(dev, "rs485-rts-delay",
3213 rs485_delay, 2);
3214 if (!ret) {
3215 rs485conf->delay_rts_before_send = rs485_delay[0];
3216 rs485conf->delay_rts_after_send = rs485_delay[1];
3217 } else {
3218 rs485conf->delay_rts_before_send = 0;
3219 rs485conf->delay_rts_after_send = 0;
3220 }
3221
3222
3223
3224
3225
3226 rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED |
3227 SER_RS485_TERMINATE_BUS |
3228 SER_RS485_RTS_AFTER_SEND);
3229 rs485conf->flags |= SER_RS485_RTS_ON_SEND;
3230
3231 if (device_property_read_bool(dev, "rs485-rx-during-tx"))
3232 rs485conf->flags |= SER_RS485_RX_DURING_TX;
3233
3234 if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time"))
3235 rs485conf->flags |= SER_RS485_ENABLED;
3236
3237 if (device_property_read_bool(dev, "rs485-rts-active-low")) {
3238 rs485conf->flags &= ~SER_RS485_RTS_ON_SEND;
3239 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
3240 }
3241
3242
3243
3244
3245
3246
3247 port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term",
3248 GPIOD_OUT_LOW);
3249 if (IS_ERR(port->rs485_term_gpio)) {
3250 ret = PTR_ERR(port->rs485_term_gpio);
3251 port->rs485_term_gpio = NULL;
3252 return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n");
3253 }
3254
3255 return 0;
3256}
3257EXPORT_SYMBOL_GPL(uart_get_rs485_mode);
3258
3259MODULE_DESCRIPTION("Serial driver core");
3260MODULE_LICENSE("GPL");
3261