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14#include <linux/tty.h>
15#include <linux/tty_flip.h>
16#include <linux/serial_reg.h>
17#include <linux/delay.h>
18#include <linux/pci.h>
19#include <linux/slab.h>
20
21#include "jsm.h"
22
23static DECLARE_BITMAP(linemap, MAXLINES);
24
25static void jsm_carrier(struct jsm_channel *ch);
26
27static inline int jsm_get_mstat(struct jsm_channel *ch)
28{
29 unsigned char mstat;
30 int result;
31
32 jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, "start\n");
33
34 mstat = (ch->ch_mostat | ch->ch_mistat);
35
36 result = 0;
37
38 if (mstat & UART_MCR_DTR)
39 result |= TIOCM_DTR;
40 if (mstat & UART_MCR_RTS)
41 result |= TIOCM_RTS;
42 if (mstat & UART_MSR_CTS)
43 result |= TIOCM_CTS;
44 if (mstat & UART_MSR_DSR)
45 result |= TIOCM_DSR;
46 if (mstat & UART_MSR_RI)
47 result |= TIOCM_RI;
48 if (mstat & UART_MSR_DCD)
49 result |= TIOCM_CD;
50
51 jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, "finish\n");
52 return result;
53}
54
55static unsigned int jsm_tty_tx_empty(struct uart_port *port)
56{
57 return TIOCSER_TEMT;
58}
59
60
61
62
63static unsigned int jsm_tty_get_mctrl(struct uart_port *port)
64{
65 int result;
66 struct jsm_channel *channel =
67 container_of(port, struct jsm_channel, uart_port);
68
69 jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "start\n");
70
71 result = jsm_get_mstat(channel);
72
73 if (result < 0)
74 return -ENXIO;
75
76 jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "finish\n");
77
78 return result;
79}
80
81
82
83
84
85
86static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl)
87{
88 struct jsm_channel *channel =
89 container_of(port, struct jsm_channel, uart_port);
90
91 jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "start\n");
92
93 if (mctrl & TIOCM_RTS)
94 channel->ch_mostat |= UART_MCR_RTS;
95 else
96 channel->ch_mostat &= ~UART_MCR_RTS;
97
98 if (mctrl & TIOCM_DTR)
99 channel->ch_mostat |= UART_MCR_DTR;
100 else
101 channel->ch_mostat &= ~UART_MCR_DTR;
102
103 channel->ch_bd->bd_ops->assert_modem_signals(channel);
104
105 jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "finish\n");
106 udelay(10);
107}
108
109
110
111
112
113
114
115static void jsm_tty_write(struct uart_port *port)
116{
117 struct jsm_channel *channel;
118
119 channel = container_of(port, struct jsm_channel, uart_port);
120 channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel);
121}
122
123static void jsm_tty_start_tx(struct uart_port *port)
124{
125 struct jsm_channel *channel =
126 container_of(port, struct jsm_channel, uart_port);
127
128 jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "start\n");
129
130 channel->ch_flags &= ~(CH_STOP);
131 jsm_tty_write(port);
132
133 jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "finish\n");
134}
135
136static void jsm_tty_stop_tx(struct uart_port *port)
137{
138 struct jsm_channel *channel =
139 container_of(port, struct jsm_channel, uart_port);
140
141 jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "start\n");
142
143 channel->ch_flags |= (CH_STOP);
144
145 jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "finish\n");
146}
147
148static void jsm_tty_send_xchar(struct uart_port *port, char ch)
149{
150 unsigned long lock_flags;
151 struct jsm_channel *channel =
152 container_of(port, struct jsm_channel, uart_port);
153 struct ktermios *termios;
154
155 spin_lock_irqsave(&port->lock, lock_flags);
156 termios = &port->state->port.tty->termios;
157 if (ch == termios->c_cc[VSTART])
158 channel->ch_bd->bd_ops->send_start_character(channel);
159
160 if (ch == termios->c_cc[VSTOP])
161 channel->ch_bd->bd_ops->send_stop_character(channel);
162 spin_unlock_irqrestore(&port->lock, lock_flags);
163}
164
165static void jsm_tty_stop_rx(struct uart_port *port)
166{
167 struct jsm_channel *channel =
168 container_of(port, struct jsm_channel, uart_port);
169
170 channel->ch_bd->bd_ops->disable_receiver(channel);
171}
172
173static void jsm_tty_break(struct uart_port *port, int break_state)
174{
175 unsigned long lock_flags;
176 struct jsm_channel *channel =
177 container_of(port, struct jsm_channel, uart_port);
178
179 spin_lock_irqsave(&port->lock, lock_flags);
180 if (break_state == -1)
181 channel->ch_bd->bd_ops->send_break(channel);
182 else
183 channel->ch_bd->bd_ops->clear_break(channel);
184
185 spin_unlock_irqrestore(&port->lock, lock_flags);
186}
187
188static int jsm_tty_open(struct uart_port *port)
189{
190 unsigned long lock_flags;
191 struct jsm_board *brd;
192 struct jsm_channel *channel =
193 container_of(port, struct jsm_channel, uart_port);
194 struct ktermios *termios;
195
196
197 brd = channel->ch_bd;
198
199
200
201
202
203 channel->ch_flags |= (CH_OPENING);
204
205
206
207 if (!channel->ch_rqueue) {
208 channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL);
209 if (!channel->ch_rqueue) {
210 jsm_dbg(INIT, &channel->ch_bd->pci_dev,
211 "unable to allocate read queue buf\n");
212 return -ENOMEM;
213 }
214 }
215 if (!channel->ch_equeue) {
216 channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL);
217 if (!channel->ch_equeue) {
218 jsm_dbg(INIT, &channel->ch_bd->pci_dev,
219 "unable to allocate error queue buf\n");
220 return -ENOMEM;
221 }
222 }
223
224 channel->ch_flags &= ~(CH_OPENING);
225
226
227
228 jsm_dbg(OPEN, &channel->ch_bd->pci_dev,
229 "jsm_open: initializing channel in open...\n");
230
231
232
233
234 channel->ch_r_head = channel->ch_r_tail = 0;
235 channel->ch_e_head = channel->ch_e_tail = 0;
236
237 brd->bd_ops->flush_uart_write(channel);
238 brd->bd_ops->flush_uart_read(channel);
239
240 channel->ch_flags = 0;
241 channel->ch_cached_lsr = 0;
242 channel->ch_stops_sent = 0;
243
244 spin_lock_irqsave(&port->lock, lock_flags);
245 termios = &port->state->port.tty->termios;
246 channel->ch_c_cflag = termios->c_cflag;
247 channel->ch_c_iflag = termios->c_iflag;
248 channel->ch_c_oflag = termios->c_oflag;
249 channel->ch_c_lflag = termios->c_lflag;
250 channel->ch_startc = termios->c_cc[VSTART];
251 channel->ch_stopc = termios->c_cc[VSTOP];
252
253
254 brd->bd_ops->uart_init(channel);
255
256
257
258
259 brd->bd_ops->param(channel);
260
261 jsm_carrier(channel);
262
263 channel->ch_open_count++;
264 spin_unlock_irqrestore(&port->lock, lock_flags);
265
266 jsm_dbg(OPEN, &channel->ch_bd->pci_dev, "finish\n");
267 return 0;
268}
269
270static void jsm_tty_close(struct uart_port *port)
271{
272 struct jsm_board *bd;
273 struct jsm_channel *channel =
274 container_of(port, struct jsm_channel, uart_port);
275
276 jsm_dbg(CLOSE, &channel->ch_bd->pci_dev, "start\n");
277
278 bd = channel->ch_bd;
279
280 channel->ch_flags &= ~(CH_STOPI);
281
282 channel->ch_open_count--;
283
284
285
286
287 if (channel->ch_c_cflag & HUPCL) {
288 jsm_dbg(CLOSE, &channel->ch_bd->pci_dev,
289 "Close. HUPCL set, dropping DTR/RTS\n");
290
291
292 channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS);
293 bd->bd_ops->assert_modem_signals(channel);
294 }
295
296
297 channel->ch_bd->bd_ops->uart_off(channel);
298
299 jsm_dbg(CLOSE, &channel->ch_bd->pci_dev, "finish\n");
300}
301
302static void jsm_tty_set_termios(struct uart_port *port,
303 struct ktermios *termios,
304 struct ktermios *old_termios)
305{
306 unsigned long lock_flags;
307 struct jsm_channel *channel =
308 container_of(port, struct jsm_channel, uart_port);
309
310 spin_lock_irqsave(&port->lock, lock_flags);
311 channel->ch_c_cflag = termios->c_cflag;
312 channel->ch_c_iflag = termios->c_iflag;
313 channel->ch_c_oflag = termios->c_oflag;
314 channel->ch_c_lflag = termios->c_lflag;
315 channel->ch_startc = termios->c_cc[VSTART];
316 channel->ch_stopc = termios->c_cc[VSTOP];
317
318 channel->ch_bd->bd_ops->param(channel);
319 jsm_carrier(channel);
320 spin_unlock_irqrestore(&port->lock, lock_flags);
321}
322
323static const char *jsm_tty_type(struct uart_port *port)
324{
325 return "jsm";
326}
327
328static void jsm_tty_release_port(struct uart_port *port)
329{
330}
331
332static int jsm_tty_request_port(struct uart_port *port)
333{
334 return 0;
335}
336
337static void jsm_config_port(struct uart_port *port, int flags)
338{
339 port->type = PORT_JSM;
340}
341
342static const struct uart_ops jsm_ops = {
343 .tx_empty = jsm_tty_tx_empty,
344 .set_mctrl = jsm_tty_set_mctrl,
345 .get_mctrl = jsm_tty_get_mctrl,
346 .stop_tx = jsm_tty_stop_tx,
347 .start_tx = jsm_tty_start_tx,
348 .send_xchar = jsm_tty_send_xchar,
349 .stop_rx = jsm_tty_stop_rx,
350 .break_ctl = jsm_tty_break,
351 .startup = jsm_tty_open,
352 .shutdown = jsm_tty_close,
353 .set_termios = jsm_tty_set_termios,
354 .type = jsm_tty_type,
355 .release_port = jsm_tty_release_port,
356 .request_port = jsm_tty_request_port,
357 .config_port = jsm_config_port,
358};
359
360
361
362
363
364
365
366int jsm_tty_init(struct jsm_board *brd)
367{
368 int i;
369 void __iomem *vaddr;
370 struct jsm_channel *ch;
371
372 if (!brd)
373 return -ENXIO;
374
375 jsm_dbg(INIT, &brd->pci_dev, "start\n");
376
377
378
379
380
381 brd->nasync = brd->maxports;
382
383
384
385
386
387 for (i = 0; i < brd->nasync; i++) {
388 if (!brd->channels[i]) {
389
390
391
392
393
394 brd->channels[i] = kzalloc(sizeof(struct jsm_channel), GFP_KERNEL);
395 if (!brd->channels[i]) {
396 jsm_dbg(CORE, &brd->pci_dev,
397 "%s:%d Unable to allocate memory for channel struct\n",
398 __FILE__, __LINE__);
399 }
400 }
401 }
402
403 ch = brd->channels[0];
404 vaddr = brd->re_map_membase;
405
406
407 for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
408
409 if (!brd->channels[i])
410 continue;
411
412 spin_lock_init(&ch->ch_lock);
413
414 if (brd->bd_uart_offset == 0x200)
415 ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i);
416 else
417 ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i);
418
419 ch->ch_bd = brd;
420 ch->ch_portnum = i;
421
422
423 ch->ch_close_delay = 250;
424
425 init_waitqueue_head(&ch->ch_flags_wait);
426 }
427
428 jsm_dbg(INIT, &brd->pci_dev, "finish\n");
429 return 0;
430}
431
432int jsm_uart_port_init(struct jsm_board *brd)
433{
434 int i, rc;
435 unsigned int line;
436
437 if (!brd)
438 return -ENXIO;
439
440 jsm_dbg(INIT, &brd->pci_dev, "start\n");
441
442
443
444
445
446 brd->nasync = brd->maxports;
447
448
449 for (i = 0; i < brd->nasync; i++) {
450
451 if (!brd->channels[i])
452 continue;
453
454 brd->channels[i]->uart_port.irq = brd->irq;
455 brd->channels[i]->uart_port.uartclk = 14745600;
456 brd->channels[i]->uart_port.type = PORT_JSM;
457 brd->channels[i]->uart_port.iotype = UPIO_MEM;
458 brd->channels[i]->uart_port.membase = brd->re_map_membase;
459 brd->channels[i]->uart_port.fifosize = 16;
460 brd->channels[i]->uart_port.ops = &jsm_ops;
461 line = find_first_zero_bit(linemap, MAXLINES);
462 if (line >= MAXLINES) {
463 printk(KERN_INFO "jsm: linemap is full, added device failed\n");
464 continue;
465 } else
466 set_bit(line, linemap);
467 brd->channels[i]->uart_port.line = line;
468 rc = uart_add_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
469 if (rc) {
470 printk(KERN_INFO "jsm: Port %d failed. Aborting...\n", i);
471 return rc;
472 } else
473 printk(KERN_INFO "jsm: Port %d added\n", i);
474 }
475
476 jsm_dbg(INIT, &brd->pci_dev, "finish\n");
477 return 0;
478}
479
480int jsm_remove_uart_port(struct jsm_board *brd)
481{
482 int i;
483 struct jsm_channel *ch;
484
485 if (!brd)
486 return -ENXIO;
487
488 jsm_dbg(INIT, &brd->pci_dev, "start\n");
489
490
491
492
493
494 brd->nasync = brd->maxports;
495
496
497 for (i = 0; i < brd->nasync; i++) {
498
499 if (!brd->channels[i])
500 continue;
501
502 ch = brd->channels[i];
503
504 clear_bit(ch->uart_port.line, linemap);
505 uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
506 }
507
508 jsm_dbg(INIT, &brd->pci_dev, "finish\n");
509 return 0;
510}
511
512void jsm_input(struct jsm_channel *ch)
513{
514 struct jsm_board *bd;
515 struct tty_struct *tp;
516 struct tty_port *port;
517 u32 rmask;
518 u16 head;
519 u16 tail;
520 int data_len;
521 unsigned long lock_flags;
522 int len = 0;
523 int s = 0;
524 int i = 0;
525
526 jsm_dbg(READ, &ch->ch_bd->pci_dev, "start\n");
527
528 port = &ch->uart_port.state->port;
529 tp = port->tty;
530
531 bd = ch->ch_bd;
532 if (!bd)
533 return;
534
535 spin_lock_irqsave(&ch->ch_lock, lock_flags);
536
537
538
539
540
541
542 rmask = RQUEUEMASK;
543
544 head = ch->ch_r_head & rmask;
545 tail = ch->ch_r_tail & rmask;
546
547 data_len = (head - tail) & rmask;
548 if (data_len == 0) {
549 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
550 return;
551 }
552
553 jsm_dbg(READ, &ch->ch_bd->pci_dev, "start\n");
554
555
556
557
558
559 if (!tp || !C_CREAD(tp)) {
560
561 jsm_dbg(READ, &ch->ch_bd->pci_dev,
562 "input. dropping %d bytes on port %d...\n",
563 data_len, ch->ch_portnum);
564 ch->ch_r_head = tail;
565
566
567 jsm_check_queue_flow_control(ch);
568
569 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
570 return;
571 }
572
573
574
575
576 if (ch->ch_flags & CH_STOPI) {
577 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
578 jsm_dbg(READ, &ch->ch_bd->pci_dev,
579 "Port %d throttled, not reading any data. head: %x tail: %x\n",
580 ch->ch_portnum, head, tail);
581 return;
582 }
583
584 jsm_dbg(READ, &ch->ch_bd->pci_dev, "start 2\n");
585
586 len = tty_buffer_request_room(port, data_len);
587
588
589
590
591
592
593 while (len) {
594 s = ((head >= tail) ? head : RQUEUESIZE) - tail;
595 s = min(s, len);
596
597 if (s <= 0)
598 break;
599
600
601
602
603
604
605
606
607 if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
608 for (i = 0; i < s; i++) {
609 u8 chr = ch->ch_rqueue[tail + i];
610 u8 error = ch->ch_equeue[tail + i];
611 char flag = TTY_NORMAL;
612
613
614
615
616
617 if (error & UART_LSR_BI)
618 flag = TTY_BREAK;
619 else if (error & UART_LSR_PE)
620 flag = TTY_PARITY;
621 else if (error & UART_LSR_FE)
622 flag = TTY_FRAME;
623
624 tty_insert_flip_char(port, chr, flag);
625 }
626 } else {
627 tty_insert_flip_string(port, ch->ch_rqueue + tail, s);
628 }
629 tail += s;
630 len -= s;
631
632 tail &= rmask;
633 }
634
635 ch->ch_r_tail = tail & rmask;
636 ch->ch_e_tail = tail & rmask;
637 jsm_check_queue_flow_control(ch);
638 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
639
640
641 tty_flip_buffer_push(port);
642
643 jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, "finish\n");
644}
645
646static void jsm_carrier(struct jsm_channel *ch)
647{
648 struct jsm_board *bd;
649
650 int virt_carrier = 0;
651 int phys_carrier = 0;
652
653 jsm_dbg(CARR, &ch->ch_bd->pci_dev, "start\n");
654
655 bd = ch->ch_bd;
656 if (!bd)
657 return;
658
659 if (ch->ch_mistat & UART_MSR_DCD) {
660 jsm_dbg(CARR, &ch->ch_bd->pci_dev, "mistat: %x D_CD: %x\n",
661 ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD);
662 phys_carrier = 1;
663 }
664
665 if (ch->ch_c_cflag & CLOCAL)
666 virt_carrier = 1;
667
668 jsm_dbg(CARR, &ch->ch_bd->pci_dev, "DCD: physical: %d virt: %d\n",
669 phys_carrier, virt_carrier);
670
671
672
673
674 if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
675
676
677
678
679
680
681 jsm_dbg(CARR, &ch->ch_bd->pci_dev, "carrier: virt DCD rose\n");
682
683 if (waitqueue_active(&(ch->ch_flags_wait)))
684 wake_up_interruptible(&ch->ch_flags_wait);
685 }
686
687
688
689
690 if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
691
692
693
694
695
696
697 jsm_dbg(CARR, &ch->ch_bd->pci_dev,
698 "carrier: physical DCD rose\n");
699
700 if (waitqueue_active(&(ch->ch_flags_wait)))
701 wake_up_interruptible(&ch->ch_flags_wait);
702 }
703
704
705
706
707
708
709
710
711
712
713 if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0)
714 && (phys_carrier == 0)) {
715
716
717
718
719
720
721
722
723
724
725
726
727 if (waitqueue_active(&(ch->ch_flags_wait)))
728 wake_up_interruptible(&ch->ch_flags_wait);
729 }
730
731
732
733
734 if (virt_carrier == 1)
735 ch->ch_flags |= CH_FCAR;
736 else
737 ch->ch_flags &= ~CH_FCAR;
738
739 if (phys_carrier == 1)
740 ch->ch_flags |= CH_CD;
741 else
742 ch->ch_flags &= ~CH_CD;
743}
744
745
746void jsm_check_queue_flow_control(struct jsm_channel *ch)
747{
748 struct board_ops *bd_ops = ch->ch_bd->bd_ops;
749 int qleft;
750
751
752 if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0)
753 qleft += RQUEUEMASK + 1;
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770 if (qleft < 256) {
771
772 if (ch->ch_c_cflag & CRTSCTS) {
773 if (!(ch->ch_flags & CH_RECEIVER_OFF)) {
774 bd_ops->disable_receiver(ch);
775 ch->ch_flags |= (CH_RECEIVER_OFF);
776 jsm_dbg(READ, &ch->ch_bd->pci_dev,
777 "Internal queue hit hilevel mark (%d)! Turning off interrupts\n",
778 qleft);
779 }
780 }
781
782 else if (ch->ch_c_iflag & IXOFF) {
783 if (ch->ch_stops_sent <= MAX_STOPS_SENT) {
784 bd_ops->send_stop_character(ch);
785 ch->ch_stops_sent++;
786 jsm_dbg(READ, &ch->ch_bd->pci_dev,
787 "Sending stop char! Times sent: %x\n",
788 ch->ch_stops_sent);
789 }
790 }
791 }
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808 if (qleft > (RQUEUESIZE / 2)) {
809
810 if (ch->ch_c_cflag & CRTSCTS) {
811 if (ch->ch_flags & CH_RECEIVER_OFF) {
812 bd_ops->enable_receiver(ch);
813 ch->ch_flags &= ~(CH_RECEIVER_OFF);
814 jsm_dbg(READ, &ch->ch_bd->pci_dev,
815 "Internal queue hit lowlevel mark (%d)! Turning on interrupts\n",
816 qleft);
817 }
818 }
819
820 else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) {
821 ch->ch_stops_sent = 0;
822 bd_ops->send_start_character(ch);
823 jsm_dbg(READ, &ch->ch_bd->pci_dev,
824 "Sending start char!\n");
825 }
826 }
827}
828