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1/************************************************************************
2 * Copyright 2003 Digi International (www.digi.com)
3 *
4 * Copyright (C) 2004 IBM Corporation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2, or (at your option)
9 * any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
13 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
14 * PURPOSE. See the GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 * Temple Place - Suite 330, Boston,
19 * MA 02111-1307, USA.
20 *
21 * Contact Information:
22 * Scott H Kilau <Scott_Kilau@digi.com>
23 * Ananda Venkatarman <mansarov@us.ibm.com>
24 * Modifications:
25 * 01/19/06: changed jsm_input routine to use the dynamically allocated
26 * tty_buffer changes. Contributors: Scott Kilau and Ananda V.
27 ***********************************************************************/
28#include <linux/tty.h>
29#include <linux/tty_flip.h>
30#include <linux/serial_reg.h>
31#include <linux/delay.h> /* For udelay */
32#include <linux/pci.h>
33#include <linux/slab.h>
34
35#include "jsm.h"
36
37static DECLARE_BITMAP(linemap, MAXLINES);
38
39static void jsm_carrier(struct jsm_channel *ch);
40
41static inline int jsm_get_mstat(struct jsm_channel *ch)
42{
43 unsigned char mstat;
44 unsigned result;
45
46 jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n");
47
48 mstat = (ch->ch_mostat | ch->ch_mistat);
49
50 result = 0;
51
52 if (mstat & UART_MCR_DTR)
53 result |= TIOCM_DTR;
54 if (mstat & UART_MCR_RTS)
55 result |= TIOCM_RTS;
56 if (mstat & UART_MSR_CTS)
57 result |= TIOCM_CTS;
58 if (mstat & UART_MSR_DSR)
59 result |= TIOCM_DSR;
60 if (mstat & UART_MSR_RI)
61 result |= TIOCM_RI;
62 if (mstat & UART_MSR_DCD)
63 result |= TIOCM_CD;
64
65 jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
66 return result;
67}
68
69static unsigned int jsm_tty_tx_empty(struct uart_port *port)
70{
71 return TIOCSER_TEMT;
72}
73
74/*
75 * Return modem signals to ld.
76 */
77static unsigned int jsm_tty_get_mctrl(struct uart_port *port)
78{
79 int result;
80 struct jsm_channel *channel = (struct jsm_channel *)port;
81
82 jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
83
84 result = jsm_get_mstat(channel);
85
86 if (result < 0)
87 return -ENXIO;
88
89 jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
90
91 return result;
92}
93
94/*
95 * jsm_set_modem_info()
96 *
97 * Set modem signals, called by ld.
98 */
99static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl)
100{
101 struct jsm_channel *channel = (struct jsm_channel *)port;
102
103 jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
104
105 if (mctrl & TIOCM_RTS)
106 channel->ch_mostat |= UART_MCR_RTS;
107 else
108 channel->ch_mostat &= ~UART_MCR_RTS;
109
110 if (mctrl & TIOCM_DTR)
111 channel->ch_mostat |= UART_MCR_DTR;
112 else
113 channel->ch_mostat &= ~UART_MCR_DTR;
114
115 channel->ch_bd->bd_ops->assert_modem_signals(channel);
116
117 jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
118 udelay(10);
119}
120
121/*
122 * jsm_tty_write()
123 *
124 * Take data from the user or kernel and send it out to the FEP.
125 * In here exists all the Transparent Print magic as well.
126 */
127static void jsm_tty_write(struct uart_port *port)
128{
129 struct jsm_channel *channel;
130 channel = container_of(port, struct jsm_channel, uart_port);
131 channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel);
132}
133
134static void jsm_tty_start_tx(struct uart_port *port)
135{
136 struct jsm_channel *channel = (struct jsm_channel *)port;
137
138 jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
139
140 channel->ch_flags &= ~(CH_STOP);
141 jsm_tty_write(port);
142
143 jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
144}
145
146static void jsm_tty_stop_tx(struct uart_port *port)
147{
148 struct jsm_channel *channel = (struct jsm_channel *)port;
149
150 jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
151
152 channel->ch_flags |= (CH_STOP);
153
154 jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
155}
156
157static void jsm_tty_send_xchar(struct uart_port *port, char ch)
158{
159 unsigned long lock_flags;
160 struct jsm_channel *channel = (struct jsm_channel *)port;
161 struct ktermios *termios;
162
163 spin_lock_irqsave(&port->lock, lock_flags);
164 termios = port->state->port.tty->termios;
165 if (ch == termios->c_cc[VSTART])
166 channel->ch_bd->bd_ops->send_start_character(channel);
167
168 if (ch == termios->c_cc[VSTOP])
169 channel->ch_bd->bd_ops->send_stop_character(channel);
170 spin_unlock_irqrestore(&port->lock, lock_flags);
171}
172
173static void jsm_tty_stop_rx(struct uart_port *port)
174{
175 struct jsm_channel *channel = (struct jsm_channel *)port;
176
177 channel->ch_bd->bd_ops->disable_receiver(channel);
178}
179
180static void jsm_tty_enable_ms(struct uart_port *port)
181{
182 /* Nothing needed */
183}
184
185static void jsm_tty_break(struct uart_port *port, int break_state)
186{
187 unsigned long lock_flags;
188 struct jsm_channel *channel = (struct jsm_channel *)port;
189
190 spin_lock_irqsave(&port->lock, lock_flags);
191 if (break_state == -1)
192 channel->ch_bd->bd_ops->send_break(channel);
193 else
194 channel->ch_bd->bd_ops->clear_break(channel, 0);
195
196 spin_unlock_irqrestore(&port->lock, lock_flags);
197}
198
199static int jsm_tty_open(struct uart_port *port)
200{
201 struct jsm_board *brd;
202 struct jsm_channel *channel = (struct jsm_channel *)port;
203 struct ktermios *termios;
204
205 /* Get board pointer from our array of majors we have allocated */
206 brd = channel->ch_bd;
207
208 /*
209 * Allocate channel buffers for read/write/error.
210 * Set flag, so we don't get trounced on.
211 */
212 channel->ch_flags |= (CH_OPENING);
213
214 /* Drop locks, as malloc with GFP_KERNEL can sleep */
215
216 if (!channel->ch_rqueue) {
217 channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL);
218 if (!channel->ch_rqueue) {
219 jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
220 "unable to allocate read queue buf");
221 return -ENOMEM;
222 }
223 }
224 if (!channel->ch_equeue) {
225 channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL);
226 if (!channel->ch_equeue) {
227 jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
228 "unable to allocate error queue buf");
229 return -ENOMEM;
230 }
231 }
232
233 channel->ch_flags &= ~(CH_OPENING);
234 /*
235 * Initialize if neither terminal is open.
236 */
237 jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev,
238 "jsm_open: initializing channel in open...\n");
239
240 /*
241 * Flush input queues.
242 */
243 channel->ch_r_head = channel->ch_r_tail = 0;
244 channel->ch_e_head = channel->ch_e_tail = 0;
245
246 brd->bd_ops->flush_uart_write(channel);
247 brd->bd_ops->flush_uart_read(channel);
248
249 channel->ch_flags = 0;
250 channel->ch_cached_lsr = 0;
251 channel->ch_stops_sent = 0;
252
253 termios = port->state->port.tty->termios;
254 channel->ch_c_cflag = termios->c_cflag;
255 channel->ch_c_iflag = termios->c_iflag;
256 channel->ch_c_oflag = termios->c_oflag;
257 channel->ch_c_lflag = termios->c_lflag;
258 channel->ch_startc = termios->c_cc[VSTART];
259 channel->ch_stopc = termios->c_cc[VSTOP];
260
261 /* Tell UART to init itself */
262 brd->bd_ops->uart_init(channel);
263
264 /*
265 * Run param in case we changed anything
266 */
267 brd->bd_ops->param(channel);
268
269 jsm_carrier(channel);
270
271 channel->ch_open_count++;
272
273 jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n");
274 return 0;
275}
276
277static void jsm_tty_close(struct uart_port *port)
278{
279 struct jsm_board *bd;
280 struct ktermios *ts;
281 struct jsm_channel *channel = (struct jsm_channel *)port;
282
283 jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n");
284
285 bd = channel->ch_bd;
286 ts = port->state->port.tty->termios;
287
288 channel->ch_flags &= ~(CH_STOPI);
289
290 channel->ch_open_count--;
291
292 /*
293 * If we have HUPCL set, lower DTR and RTS
294 */
295 if (channel->ch_c_cflag & HUPCL) {
296 jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev,
297 "Close. HUPCL set, dropping DTR/RTS\n");
298
299 /* Drop RTS/DTR */
300 channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS);
301 bd->bd_ops->assert_modem_signals(channel);
302 }
303
304 /* Turn off UART interrupts for this port */
305 channel->ch_bd->bd_ops->uart_off(channel);
306
307 jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n");
308}
309
310static void jsm_tty_set_termios(struct uart_port *port,
311 struct ktermios *termios,
312 struct ktermios *old_termios)
313{
314 unsigned long lock_flags;
315 struct jsm_channel *channel = (struct jsm_channel *)port;
316
317 spin_lock_irqsave(&port->lock, lock_flags);
318 channel->ch_c_cflag = termios->c_cflag;
319 channel->ch_c_iflag = termios->c_iflag;
320 channel->ch_c_oflag = termios->c_oflag;
321 channel->ch_c_lflag = termios->c_lflag;
322 channel->ch_startc = termios->c_cc[VSTART];
323 channel->ch_stopc = termios->c_cc[VSTOP];
324
325 channel->ch_bd->bd_ops->param(channel);
326 jsm_carrier(channel);
327 spin_unlock_irqrestore(&port->lock, lock_flags);
328}
329
330static const char *jsm_tty_type(struct uart_port *port)
331{
332 return "jsm";
333}
334
335static void jsm_tty_release_port(struct uart_port *port)
336{
337}
338
339static int jsm_tty_request_port(struct uart_port *port)
340{
341 return 0;
342}
343
344static void jsm_config_port(struct uart_port *port, int flags)
345{
346 port->type = PORT_JSM;
347}
348
349static struct uart_ops jsm_ops = {
350 .tx_empty = jsm_tty_tx_empty,
351 .set_mctrl = jsm_tty_set_mctrl,
352 .get_mctrl = jsm_tty_get_mctrl,
353 .stop_tx = jsm_tty_stop_tx,
354 .start_tx = jsm_tty_start_tx,
355 .send_xchar = jsm_tty_send_xchar,
356 .stop_rx = jsm_tty_stop_rx,
357 .enable_ms = jsm_tty_enable_ms,
358 .break_ctl = jsm_tty_break,
359 .startup = jsm_tty_open,
360 .shutdown = jsm_tty_close,
361 .set_termios = jsm_tty_set_termios,
362 .type = jsm_tty_type,
363 .release_port = jsm_tty_release_port,
364 .request_port = jsm_tty_request_port,
365 .config_port = jsm_config_port,
366};
367
368/*
369 * jsm_tty_init()
370 *
371 * Init the tty subsystem. Called once per board after board has been
372 * downloaded and init'ed.
373 */
374int __devinit jsm_tty_init(struct jsm_board *brd)
375{
376 int i;
377 void __iomem *vaddr;
378 struct jsm_channel *ch;
379
380 if (!brd)
381 return -ENXIO;
382
383 jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
384
385 /*
386 * Initialize board structure elements.
387 */
388
389 brd->nasync = brd->maxports;
390
391 /*
392 * Allocate channel memory that might not have been allocated
393 * when the driver was first loaded.
394 */
395 for (i = 0; i < brd->nasync; i++) {
396 if (!brd->channels[i]) {
397
398 /*
399 * Okay to malloc with GFP_KERNEL, we are not at
400 * interrupt context, and there are no locks held.
401 */
402 brd->channels[i] = kzalloc(sizeof(struct jsm_channel), GFP_KERNEL);
403 if (!brd->channels[i]) {
404 jsm_printk(CORE, ERR, &brd->pci_dev,
405 "%s:%d Unable to allocate memory for channel struct\n",
406 __FILE__, __LINE__);
407 }
408 }
409 }
410
411 ch = brd->channels[0];
412 vaddr = brd->re_map_membase;
413
414 /* Set up channel variables */
415 for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
416
417 if (!brd->channels[i])
418 continue;
419
420 spin_lock_init(&ch->ch_lock);
421
422 if (brd->bd_uart_offset == 0x200)
423 ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i);
424
425 ch->ch_bd = brd;
426 ch->ch_portnum = i;
427
428 /* .25 second delay */
429 ch->ch_close_delay = 250;
430
431 init_waitqueue_head(&ch->ch_flags_wait);
432 }
433
434 jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n");
435 return 0;
436}
437
438int jsm_uart_port_init(struct jsm_board *brd)
439{
440 int i, rc;
441 unsigned int line;
442 struct jsm_channel *ch;
443
444 if (!brd)
445 return -ENXIO;
446
447 jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
448
449 /*
450 * Initialize board structure elements.
451 */
452
453 brd->nasync = brd->maxports;
454
455 /* Set up channel variables */
456 for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
457
458 if (!brd->channels[i])
459 continue;
460
461 brd->channels[i]->uart_port.irq = brd->irq;
462 brd->channels[i]->uart_port.uartclk = 14745600;
463 brd->channels[i]->uart_port.type = PORT_JSM;
464 brd->channels[i]->uart_port.iotype = UPIO_MEM;
465 brd->channels[i]->uart_port.membase = brd->re_map_membase;
466 brd->channels[i]->uart_port.fifosize = 16;
467 brd->channels[i]->uart_port.ops = &jsm_ops;
468 line = find_first_zero_bit(linemap, MAXLINES);
469 if (line >= MAXLINES) {
470 printk(KERN_INFO "jsm: linemap is full, added device failed\n");
471 continue;
472 } else
473 set_bit(line, linemap);
474 brd->channels[i]->uart_port.line = line;
475 rc = uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port);
476 if (rc){
477 printk(KERN_INFO "jsm: Port %d failed. Aborting...\n", i);
478 return rc;
479 }
480 else
481 printk(KERN_INFO "jsm: Port %d added\n", i);
482 }
483
484 jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n");
485 return 0;
486}
487
488int jsm_remove_uart_port(struct jsm_board *brd)
489{
490 int i;
491 struct jsm_channel *ch;
492
493 if (!brd)
494 return -ENXIO;
495
496 jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
497
498 /*
499 * Initialize board structure elements.
500 */
501
502 brd->nasync = brd->maxports;
503
504 /* Set up channel variables */
505 for (i = 0; i < brd->nasync; i++) {
506
507 if (!brd->channels[i])
508 continue;
509
510 ch = brd->channels[i];
511
512 clear_bit(ch->uart_port.line, linemap);
513 uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
514 }
515
516 jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n");
517 return 0;
518}
519
520void jsm_input(struct jsm_channel *ch)
521{
522 struct jsm_board *bd;
523 struct tty_struct *tp;
524 u32 rmask;
525 u16 head;
526 u16 tail;
527 int data_len;
528 unsigned long lock_flags;
529 int len = 0;
530 int n = 0;
531 int s = 0;
532 int i = 0;
533
534 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n");
535
536 if (!ch)
537 return;
538
539 tp = ch->uart_port.state->port.tty;
540
541 bd = ch->ch_bd;
542 if(!bd)
543 return;
544
545 spin_lock_irqsave(&ch->ch_lock, lock_flags);
546
547 /*
548 *Figure the number of characters in the buffer.
549 *Exit immediately if none.
550 */
551
552 rmask = RQUEUEMASK;
553
554 head = ch->ch_r_head & rmask;
555 tail = ch->ch_r_tail & rmask;
556
557 data_len = (head - tail) & rmask;
558 if (data_len == 0) {
559 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
560 return;
561 }
562
563 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n");
564
565 /*
566 *If the device is not open, or CREAD is off, flush
567 *input data and return immediately.
568 */
569 if (!tp ||
570 !(tp->termios->c_cflag & CREAD) ) {
571
572 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
573 "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum);
574 ch->ch_r_head = tail;
575
576 /* Force queue flow control to be released, if needed */
577 jsm_check_queue_flow_control(ch);
578
579 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
580 return;
581 }
582
583 /*
584 * If we are throttled, simply don't read any data.
585 */
586 if (ch->ch_flags & CH_STOPI) {
587 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
588 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
589 "Port %d throttled, not reading any data. head: %x tail: %x\n",
590 ch->ch_portnum, head, tail);
591 return;
592 }
593
594 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n");
595
596 if (data_len <= 0) {
597 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
598 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n");
599 return;
600 }
601
602 len = tty_buffer_request_room(tp, data_len);
603 n = len;
604
605 /*
606 * n now contains the most amount of data we can copy,
607 * bounded either by the flip buffer size or the amount
608 * of data the card actually has pending...
609 */
610 while (n) {
611 s = ((head >= tail) ? head : RQUEUESIZE) - tail;
612 s = min(s, n);
613
614 if (s <= 0)
615 break;
616
617 /*
618 * If conditions are such that ld needs to see all
619 * UART errors, we will have to walk each character
620 * and error byte and send them to the buffer one at
621 * a time.
622 */
623
624 if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
625 for (i = 0; i < s; i++) {
626 /*
627 * Give the Linux ld the flags in the
628 * format it likes.
629 */
630 if (*(ch->ch_equeue +tail +i) & UART_LSR_BI)
631 tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_BREAK);
632 else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE)
633 tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY);
634 else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE)
635 tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME);
636 else
637 tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL);
638 }
639 } else {
640 tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ;
641 }
642 tail += s;
643 n -= s;
644 /* Flip queue if needed */
645 tail &= rmask;
646 }
647
648 ch->ch_r_tail = tail & rmask;
649 ch->ch_e_tail = tail & rmask;
650 jsm_check_queue_flow_control(ch);
651 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
652
653 /* Tell the tty layer its okay to "eat" the data now */
654 tty_flip_buffer_push(tp);
655
656 jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
657}
658
659static void jsm_carrier(struct jsm_channel *ch)
660{
661 struct jsm_board *bd;
662
663 int virt_carrier = 0;
664 int phys_carrier = 0;
665
666 jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n");
667 if (!ch)
668 return;
669
670 bd = ch->ch_bd;
671
672 if (!bd)
673 return;
674
675 if (ch->ch_mistat & UART_MSR_DCD) {
676 jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
677 "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD);
678 phys_carrier = 1;
679 }
680
681 if (ch->ch_c_cflag & CLOCAL)
682 virt_carrier = 1;
683
684 jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
685 "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier);
686
687 /*
688 * Test for a VIRTUAL carrier transition to HIGH.
689 */
690 if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
691
692 /*
693 * When carrier rises, wake any threads waiting
694 * for carrier in the open routine.
695 */
696
697 jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
698 "carrier: virt DCD rose\n");
699
700 if (waitqueue_active(&(ch->ch_flags_wait)))
701 wake_up_interruptible(&ch->ch_flags_wait);
702 }
703
704 /*
705 * Test for a PHYSICAL carrier transition to HIGH.
706 */
707 if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
708
709 /*
710 * When carrier rises, wake any threads waiting
711 * for carrier in the open routine.
712 */
713
714 jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
715 "carrier: physical DCD rose\n");
716
717 if (waitqueue_active(&(ch->ch_flags_wait)))
718 wake_up_interruptible(&ch->ch_flags_wait);
719 }
720
721 /*
722 * Test for a PHYSICAL transition to low, so long as we aren't
723 * currently ignoring physical transitions (which is what "virtual
724 * carrier" indicates).
725 *
726 * The transition of the virtual carrier to low really doesn't
727 * matter... it really only means "ignore carrier state", not
728 * "make pretend that carrier is there".
729 */
730 if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0)
731 && (phys_carrier == 0)) {
732 /*
733 * When carrier drops:
734 *
735 * Drop carrier on all open units.
736 *
737 * Flush queues, waking up any task waiting in the
738 * line discipline.
739 *
740 * Send a hangup to the control terminal.
741 *
742 * Enable all select calls.
743 */
744 if (waitqueue_active(&(ch->ch_flags_wait)))
745 wake_up_interruptible(&ch->ch_flags_wait);
746 }
747
748 /*
749 * Make sure that our cached values reflect the current reality.
750 */
751 if (virt_carrier == 1)
752 ch->ch_flags |= CH_FCAR;
753 else
754 ch->ch_flags &= ~CH_FCAR;
755
756 if (phys_carrier == 1)
757 ch->ch_flags |= CH_CD;
758 else
759 ch->ch_flags &= ~CH_CD;
760}
761
762
763void jsm_check_queue_flow_control(struct jsm_channel *ch)
764{
765 struct board_ops *bd_ops = ch->ch_bd->bd_ops;
766 int qleft;
767
768 /* Store how much space we have left in the queue */
769 if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0)
770 qleft += RQUEUEMASK + 1;
771
772 /*
773 * Check to see if we should enforce flow control on our queue because
774 * the ld (or user) isn't reading data out of our queue fast enuf.
775 *
776 * NOTE: This is done based on what the current flow control of the
777 * port is set for.
778 *
779 * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt.
780 * This will cause the UART's FIFO to back up, and force
781 * the RTS signal to be dropped.
782 * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to
783 * the other side, in hopes it will stop sending data to us.
784 * 3) NONE - Nothing we can do. We will simply drop any extra data
785 * that gets sent into us when the queue fills up.
786 */
787 if (qleft < 256) {
788 /* HWFLOW */
789 if (ch->ch_c_cflag & CRTSCTS) {
790 if(!(ch->ch_flags & CH_RECEIVER_OFF)) {
791 bd_ops->disable_receiver(ch);
792 ch->ch_flags |= (CH_RECEIVER_OFF);
793 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
794 "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n",
795 qleft);
796 }
797 }
798 /* SWFLOW */
799 else if (ch->ch_c_iflag & IXOFF) {
800 if (ch->ch_stops_sent <= MAX_STOPS_SENT) {
801 bd_ops->send_stop_character(ch);
802 ch->ch_stops_sent++;
803 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
804 "Sending stop char! Times sent: %x\n", ch->ch_stops_sent);
805 }
806 }
807 }
808
809 /*
810 * Check to see if we should unenforce flow control because
811 * ld (or user) finally read enuf data out of our queue.
812 *
813 * NOTE: This is done based on what the current flow control of the
814 * port is set for.
815 *
816 * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt.
817 * This will cause the UART's FIFO to raise RTS back up,
818 * which will allow the other side to start sending data again.
819 * 2) SWFLOW (IXOFF) - Send a start character to
820 * the other side, so it will start sending data to us again.
821 * 3) NONE - Do nothing. Since we didn't do anything to turn off the
822 * other side, we don't need to do anything now.
823 */
824 if (qleft > (RQUEUESIZE / 2)) {
825 /* HWFLOW */
826 if (ch->ch_c_cflag & CRTSCTS) {
827 if (ch->ch_flags & CH_RECEIVER_OFF) {
828 bd_ops->enable_receiver(ch);
829 ch->ch_flags &= ~(CH_RECEIVER_OFF);
830 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
831 "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n",
832 qleft);
833 }
834 }
835 /* SWFLOW */
836 else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) {
837 ch->ch_stops_sent = 0;
838 bd_ops->send_start_character(ch);
839 jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n");
840 }
841 }
842}
1// SPDX-License-Identifier: GPL-2.0+
2/************************************************************************
3 * Copyright 2003 Digi International (www.digi.com)
4 *
5 * Copyright (C) 2004 IBM Corporation. All rights reserved.
6 *
7 * Contact Information:
8 * Scott H Kilau <Scott_Kilau@digi.com>
9 * Ananda Venkatarman <mansarov@us.ibm.com>
10 * Modifications:
11 * 01/19/06: changed jsm_input routine to use the dynamically allocated
12 * tty_buffer changes. Contributors: Scott Kilau and Ananda V.
13 ***********************************************************************/
14#include <linux/tty.h>
15#include <linux/tty_flip.h>
16#include <linux/serial_reg.h>
17#include <linux/delay.h> /* For udelay */
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 * Return modem signals to ld.
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 * jsm_set_modem_info()
83 *
84 * Set modem signals, called by ld.
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 * jsm_tty_write()
111 *
112 * Take data from the user or kernel and send it out to the FEP.
113 * In here exists all the Transparent Print magic as well.
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 struct jsm_board *brd;
191 struct jsm_channel *channel =
192 container_of(port, struct jsm_channel, uart_port);
193 struct ktermios *termios;
194
195 /* Get board pointer from our array of majors we have allocated */
196 brd = channel->ch_bd;
197
198 /*
199 * Allocate channel buffers for read/write/error.
200 * Set flag, so we don't get trounced on.
201 */
202 channel->ch_flags |= (CH_OPENING);
203
204 /* Drop locks, as malloc with GFP_KERNEL can sleep */
205
206 if (!channel->ch_rqueue) {
207 channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL);
208 if (!channel->ch_rqueue) {
209 jsm_dbg(INIT, &channel->ch_bd->pci_dev,
210 "unable to allocate read queue buf\n");
211 return -ENOMEM;
212 }
213 }
214 if (!channel->ch_equeue) {
215 channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL);
216 if (!channel->ch_equeue) {
217 jsm_dbg(INIT, &channel->ch_bd->pci_dev,
218 "unable to allocate error queue buf\n");
219 return -ENOMEM;
220 }
221 }
222
223 channel->ch_flags &= ~(CH_OPENING);
224 /*
225 * Initialize if neither terminal is open.
226 */
227 jsm_dbg(OPEN, &channel->ch_bd->pci_dev,
228 "jsm_open: initializing channel in open...\n");
229
230 /*
231 * Flush input queues.
232 */
233 channel->ch_r_head = channel->ch_r_tail = 0;
234 channel->ch_e_head = channel->ch_e_tail = 0;
235
236 brd->bd_ops->flush_uart_write(channel);
237 brd->bd_ops->flush_uart_read(channel);
238
239 channel->ch_flags = 0;
240 channel->ch_cached_lsr = 0;
241 channel->ch_stops_sent = 0;
242
243 termios = &port->state->port.tty->termios;
244 channel->ch_c_cflag = termios->c_cflag;
245 channel->ch_c_iflag = termios->c_iflag;
246 channel->ch_c_oflag = termios->c_oflag;
247 channel->ch_c_lflag = termios->c_lflag;
248 channel->ch_startc = termios->c_cc[VSTART];
249 channel->ch_stopc = termios->c_cc[VSTOP];
250
251 /* Tell UART to init itself */
252 brd->bd_ops->uart_init(channel);
253
254 /*
255 * Run param in case we changed anything
256 */
257 brd->bd_ops->param(channel);
258
259 jsm_carrier(channel);
260
261 channel->ch_open_count++;
262
263 jsm_dbg(OPEN, &channel->ch_bd->pci_dev, "finish\n");
264 return 0;
265}
266
267static void jsm_tty_close(struct uart_port *port)
268{
269 struct jsm_board *bd;
270 struct jsm_channel *channel =
271 container_of(port, struct jsm_channel, uart_port);
272
273 jsm_dbg(CLOSE, &channel->ch_bd->pci_dev, "start\n");
274
275 bd = channel->ch_bd;
276
277 channel->ch_flags &= ~(CH_STOPI);
278
279 channel->ch_open_count--;
280
281 /*
282 * If we have HUPCL set, lower DTR and RTS
283 */
284 if (channel->ch_c_cflag & HUPCL) {
285 jsm_dbg(CLOSE, &channel->ch_bd->pci_dev,
286 "Close. HUPCL set, dropping DTR/RTS\n");
287
288 /* Drop RTS/DTR */
289 channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS);
290 bd->bd_ops->assert_modem_signals(channel);
291 }
292
293 /* Turn off UART interrupts for this port */
294 channel->ch_bd->bd_ops->uart_off(channel);
295
296 jsm_dbg(CLOSE, &channel->ch_bd->pci_dev, "finish\n");
297}
298
299static void jsm_tty_set_termios(struct uart_port *port,
300 struct ktermios *termios,
301 struct ktermios *old_termios)
302{
303 unsigned long lock_flags;
304 struct jsm_channel *channel =
305 container_of(port, struct jsm_channel, uart_port);
306
307 spin_lock_irqsave(&port->lock, lock_flags);
308 channel->ch_c_cflag = termios->c_cflag;
309 channel->ch_c_iflag = termios->c_iflag;
310 channel->ch_c_oflag = termios->c_oflag;
311 channel->ch_c_lflag = termios->c_lflag;
312 channel->ch_startc = termios->c_cc[VSTART];
313 channel->ch_stopc = termios->c_cc[VSTOP];
314
315 channel->ch_bd->bd_ops->param(channel);
316 jsm_carrier(channel);
317 spin_unlock_irqrestore(&port->lock, lock_flags);
318}
319
320static const char *jsm_tty_type(struct uart_port *port)
321{
322 return "jsm";
323}
324
325static void jsm_tty_release_port(struct uart_port *port)
326{
327}
328
329static int jsm_tty_request_port(struct uart_port *port)
330{
331 return 0;
332}
333
334static void jsm_config_port(struct uart_port *port, int flags)
335{
336 port->type = PORT_JSM;
337}
338
339static const struct uart_ops jsm_ops = {
340 .tx_empty = jsm_tty_tx_empty,
341 .set_mctrl = jsm_tty_set_mctrl,
342 .get_mctrl = jsm_tty_get_mctrl,
343 .stop_tx = jsm_tty_stop_tx,
344 .start_tx = jsm_tty_start_tx,
345 .send_xchar = jsm_tty_send_xchar,
346 .stop_rx = jsm_tty_stop_rx,
347 .break_ctl = jsm_tty_break,
348 .startup = jsm_tty_open,
349 .shutdown = jsm_tty_close,
350 .set_termios = jsm_tty_set_termios,
351 .type = jsm_tty_type,
352 .release_port = jsm_tty_release_port,
353 .request_port = jsm_tty_request_port,
354 .config_port = jsm_config_port,
355};
356
357/*
358 * jsm_tty_init()
359 *
360 * Init the tty subsystem. Called once per board after board has been
361 * downloaded and init'ed.
362 */
363int jsm_tty_init(struct jsm_board *brd)
364{
365 int i;
366 void __iomem *vaddr;
367 struct jsm_channel *ch;
368
369 if (!brd)
370 return -ENXIO;
371
372 jsm_dbg(INIT, &brd->pci_dev, "start\n");
373
374 /*
375 * Initialize board structure elements.
376 */
377
378 brd->nasync = brd->maxports;
379
380 /*
381 * Allocate channel memory that might not have been allocated
382 * when the driver was first loaded.
383 */
384 for (i = 0; i < brd->nasync; i++) {
385 if (!brd->channels[i]) {
386
387 /*
388 * Okay to malloc with GFP_KERNEL, we are not at
389 * interrupt context, and there are no locks held.
390 */
391 brd->channels[i] = kzalloc(sizeof(struct jsm_channel), GFP_KERNEL);
392 if (!brd->channels[i]) {
393 jsm_dbg(CORE, &brd->pci_dev,
394 "%s:%d Unable to allocate memory for channel struct\n",
395 __FILE__, __LINE__);
396 }
397 }
398 }
399
400 ch = brd->channels[0];
401 vaddr = brd->re_map_membase;
402
403 /* Set up channel variables */
404 for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
405
406 if (!brd->channels[i])
407 continue;
408
409 spin_lock_init(&ch->ch_lock);
410
411 if (brd->bd_uart_offset == 0x200)
412 ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i);
413 else
414 ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i);
415
416 ch->ch_bd = brd;
417 ch->ch_portnum = i;
418
419 /* .25 second delay */
420 ch->ch_close_delay = 250;
421
422 init_waitqueue_head(&ch->ch_flags_wait);
423 }
424
425 jsm_dbg(INIT, &brd->pci_dev, "finish\n");
426 return 0;
427}
428
429int jsm_uart_port_init(struct jsm_board *brd)
430{
431 int i, rc;
432 unsigned int line;
433 struct jsm_channel *ch;
434
435 if (!brd)
436 return -ENXIO;
437
438 jsm_dbg(INIT, &brd->pci_dev, "start\n");
439
440 /*
441 * Initialize board structure elements.
442 */
443
444 brd->nasync = brd->maxports;
445
446 /* Set up channel variables */
447 for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
448
449 if (!brd->channels[i])
450 continue;
451
452 brd->channels[i]->uart_port.irq = brd->irq;
453 brd->channels[i]->uart_port.uartclk = 14745600;
454 brd->channels[i]->uart_port.type = PORT_JSM;
455 brd->channels[i]->uart_port.iotype = UPIO_MEM;
456 brd->channels[i]->uart_port.membase = brd->re_map_membase;
457 brd->channels[i]->uart_port.fifosize = 16;
458 brd->channels[i]->uart_port.ops = &jsm_ops;
459 line = find_first_zero_bit(linemap, MAXLINES);
460 if (line >= MAXLINES) {
461 printk(KERN_INFO "jsm: linemap is full, added device failed\n");
462 continue;
463 } else
464 set_bit(line, linemap);
465 brd->channels[i]->uart_port.line = line;
466 rc = uart_add_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
467 if (rc) {
468 printk(KERN_INFO "jsm: Port %d failed. Aborting...\n", i);
469 return rc;
470 } else
471 printk(KERN_INFO "jsm: Port %d added\n", i);
472 }
473
474 jsm_dbg(INIT, &brd->pci_dev, "finish\n");
475 return 0;
476}
477
478int jsm_remove_uart_port(struct jsm_board *brd)
479{
480 int i;
481 struct jsm_channel *ch;
482
483 if (!brd)
484 return -ENXIO;
485
486 jsm_dbg(INIT, &brd->pci_dev, "start\n");
487
488 /*
489 * Initialize board structure elements.
490 */
491
492 brd->nasync = brd->maxports;
493
494 /* Set up channel variables */
495 for (i = 0; i < brd->nasync; i++) {
496
497 if (!brd->channels[i])
498 continue;
499
500 ch = brd->channels[i];
501
502 clear_bit(ch->uart_port.line, linemap);
503 uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
504 }
505
506 jsm_dbg(INIT, &brd->pci_dev, "finish\n");
507 return 0;
508}
509
510void jsm_input(struct jsm_channel *ch)
511{
512 struct jsm_board *bd;
513 struct tty_struct *tp;
514 struct tty_port *port;
515 u32 rmask;
516 u16 head;
517 u16 tail;
518 int data_len;
519 unsigned long lock_flags;
520 int len = 0;
521 int s = 0;
522 int i = 0;
523
524 jsm_dbg(READ, &ch->ch_bd->pci_dev, "start\n");
525
526 port = &ch->uart_port.state->port;
527 tp = port->tty;
528
529 bd = ch->ch_bd;
530 if (!bd)
531 return;
532
533 spin_lock_irqsave(&ch->ch_lock, lock_flags);
534
535 /*
536 *Figure the number of characters in the buffer.
537 *Exit immediately if none.
538 */
539
540 rmask = RQUEUEMASK;
541
542 head = ch->ch_r_head & rmask;
543 tail = ch->ch_r_tail & rmask;
544
545 data_len = (head - tail) & rmask;
546 if (data_len == 0) {
547 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
548 return;
549 }
550
551 jsm_dbg(READ, &ch->ch_bd->pci_dev, "start\n");
552
553 /*
554 *If the device is not open, or CREAD is off, flush
555 *input data and return immediately.
556 */
557 if (!tp || !C_CREAD(tp)) {
558
559 jsm_dbg(READ, &ch->ch_bd->pci_dev,
560 "input. dropping %d bytes on port %d...\n",
561 data_len, ch->ch_portnum);
562 ch->ch_r_head = tail;
563
564 /* Force queue flow control to be released, if needed */
565 jsm_check_queue_flow_control(ch);
566
567 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
568 return;
569 }
570
571 /*
572 * If we are throttled, simply don't read any data.
573 */
574 if (ch->ch_flags & CH_STOPI) {
575 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
576 jsm_dbg(READ, &ch->ch_bd->pci_dev,
577 "Port %d throttled, not reading any data. head: %x tail: %x\n",
578 ch->ch_portnum, head, tail);
579 return;
580 }
581
582 jsm_dbg(READ, &ch->ch_bd->pci_dev, "start 2\n");
583
584 len = tty_buffer_request_room(port, data_len);
585
586 /*
587 * len now contains the most amount of data we can copy,
588 * bounded either by the flip buffer size or the amount
589 * of data the card actually has pending...
590 */
591 while (len) {
592 s = ((head >= tail) ? head : RQUEUESIZE) - tail;
593 s = min(s, len);
594
595 if (s <= 0)
596 break;
597
598 /*
599 * If conditions are such that ld needs to see all
600 * UART errors, we will have to walk each character
601 * and error byte and send them to the buffer one at
602 * a time.
603 */
604
605 if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
606 for (i = 0; i < s; i++) {
607 /*
608 * Give the Linux ld the flags in the
609 * format it likes.
610 */
611 if (*(ch->ch_equeue +tail +i) & UART_LSR_BI)
612 tty_insert_flip_char(port, *(ch->ch_rqueue +tail +i), TTY_BREAK);
613 else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE)
614 tty_insert_flip_char(port, *(ch->ch_rqueue +tail +i), TTY_PARITY);
615 else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE)
616 tty_insert_flip_char(port, *(ch->ch_rqueue +tail +i), TTY_FRAME);
617 else
618 tty_insert_flip_char(port, *(ch->ch_rqueue +tail +i), TTY_NORMAL);
619 }
620 } else {
621 tty_insert_flip_string(port, ch->ch_rqueue + tail, s);
622 }
623 tail += s;
624 len -= s;
625 /* Flip queue if needed */
626 tail &= rmask;
627 }
628
629 ch->ch_r_tail = tail & rmask;
630 ch->ch_e_tail = tail & rmask;
631 jsm_check_queue_flow_control(ch);
632 spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
633
634 /* Tell the tty layer its okay to "eat" the data now */
635 tty_flip_buffer_push(port);
636
637 jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, "finish\n");
638}
639
640static void jsm_carrier(struct jsm_channel *ch)
641{
642 struct jsm_board *bd;
643
644 int virt_carrier = 0;
645 int phys_carrier = 0;
646
647 jsm_dbg(CARR, &ch->ch_bd->pci_dev, "start\n");
648
649 bd = ch->ch_bd;
650 if (!bd)
651 return;
652
653 if (ch->ch_mistat & UART_MSR_DCD) {
654 jsm_dbg(CARR, &ch->ch_bd->pci_dev, "mistat: %x D_CD: %x\n",
655 ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD);
656 phys_carrier = 1;
657 }
658
659 if (ch->ch_c_cflag & CLOCAL)
660 virt_carrier = 1;
661
662 jsm_dbg(CARR, &ch->ch_bd->pci_dev, "DCD: physical: %d virt: %d\n",
663 phys_carrier, virt_carrier);
664
665 /*
666 * Test for a VIRTUAL carrier transition to HIGH.
667 */
668 if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
669
670 /*
671 * When carrier rises, wake any threads waiting
672 * for carrier in the open routine.
673 */
674
675 jsm_dbg(CARR, &ch->ch_bd->pci_dev, "carrier: virt DCD rose\n");
676
677 if (waitqueue_active(&(ch->ch_flags_wait)))
678 wake_up_interruptible(&ch->ch_flags_wait);
679 }
680
681 /*
682 * Test for a PHYSICAL carrier transition to HIGH.
683 */
684 if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
685
686 /*
687 * When carrier rises, wake any threads waiting
688 * for carrier in the open routine.
689 */
690
691 jsm_dbg(CARR, &ch->ch_bd->pci_dev,
692 "carrier: physical DCD rose\n");
693
694 if (waitqueue_active(&(ch->ch_flags_wait)))
695 wake_up_interruptible(&ch->ch_flags_wait);
696 }
697
698 /*
699 * Test for a PHYSICAL transition to low, so long as we aren't
700 * currently ignoring physical transitions (which is what "virtual
701 * carrier" indicates).
702 *
703 * The transition of the virtual carrier to low really doesn't
704 * matter... it really only means "ignore carrier state", not
705 * "make pretend that carrier is there".
706 */
707 if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0)
708 && (phys_carrier == 0)) {
709 /*
710 * When carrier drops:
711 *
712 * Drop carrier on all open units.
713 *
714 * Flush queues, waking up any task waiting in the
715 * line discipline.
716 *
717 * Send a hangup to the control terminal.
718 *
719 * Enable all select calls.
720 */
721 if (waitqueue_active(&(ch->ch_flags_wait)))
722 wake_up_interruptible(&ch->ch_flags_wait);
723 }
724
725 /*
726 * Make sure that our cached values reflect the current reality.
727 */
728 if (virt_carrier == 1)
729 ch->ch_flags |= CH_FCAR;
730 else
731 ch->ch_flags &= ~CH_FCAR;
732
733 if (phys_carrier == 1)
734 ch->ch_flags |= CH_CD;
735 else
736 ch->ch_flags &= ~CH_CD;
737}
738
739
740void jsm_check_queue_flow_control(struct jsm_channel *ch)
741{
742 struct board_ops *bd_ops = ch->ch_bd->bd_ops;
743 int qleft;
744
745 /* Store how much space we have left in the queue */
746 if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0)
747 qleft += RQUEUEMASK + 1;
748
749 /*
750 * Check to see if we should enforce flow control on our queue because
751 * the ld (or user) isn't reading data out of our queue fast enuf.
752 *
753 * NOTE: This is done based on what the current flow control of the
754 * port is set for.
755 *
756 * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt.
757 * This will cause the UART's FIFO to back up, and force
758 * the RTS signal to be dropped.
759 * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to
760 * the other side, in hopes it will stop sending data to us.
761 * 3) NONE - Nothing we can do. We will simply drop any extra data
762 * that gets sent into us when the queue fills up.
763 */
764 if (qleft < 256) {
765 /* HWFLOW */
766 if (ch->ch_c_cflag & CRTSCTS) {
767 if (!(ch->ch_flags & CH_RECEIVER_OFF)) {
768 bd_ops->disable_receiver(ch);
769 ch->ch_flags |= (CH_RECEIVER_OFF);
770 jsm_dbg(READ, &ch->ch_bd->pci_dev,
771 "Internal queue hit hilevel mark (%d)! Turning off interrupts\n",
772 qleft);
773 }
774 }
775 /* SWFLOW */
776 else if (ch->ch_c_iflag & IXOFF) {
777 if (ch->ch_stops_sent <= MAX_STOPS_SENT) {
778 bd_ops->send_stop_character(ch);
779 ch->ch_stops_sent++;
780 jsm_dbg(READ, &ch->ch_bd->pci_dev,
781 "Sending stop char! Times sent: %x\n",
782 ch->ch_stops_sent);
783 }
784 }
785 }
786
787 /*
788 * Check to see if we should unenforce flow control because
789 * ld (or user) finally read enuf data out of our queue.
790 *
791 * NOTE: This is done based on what the current flow control of the
792 * port is set for.
793 *
794 * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt.
795 * This will cause the UART's FIFO to raise RTS back up,
796 * which will allow the other side to start sending data again.
797 * 2) SWFLOW (IXOFF) - Send a start character to
798 * the other side, so it will start sending data to us again.
799 * 3) NONE - Do nothing. Since we didn't do anything to turn off the
800 * other side, we don't need to do anything now.
801 */
802 if (qleft > (RQUEUESIZE / 2)) {
803 /* HWFLOW */
804 if (ch->ch_c_cflag & CRTSCTS) {
805 if (ch->ch_flags & CH_RECEIVER_OFF) {
806 bd_ops->enable_receiver(ch);
807 ch->ch_flags &= ~(CH_RECEIVER_OFF);
808 jsm_dbg(READ, &ch->ch_bd->pci_dev,
809 "Internal queue hit lowlevel mark (%d)! Turning on interrupts\n",
810 qleft);
811 }
812 }
813 /* SWFLOW */
814 else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) {
815 ch->ch_stops_sent = 0;
816 bd_ops->send_start_character(ch);
817 jsm_dbg(READ, &ch->ch_bd->pci_dev,
818 "Sending start char!\n");
819 }
820 }
821}