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1da177e4 LT |
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> | |
0a577ce3 AK |
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. | |
1da177e4 LT |
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 | ||
34 | #include "jsm.h" | |
35 | ||
408b664a AB |
36 | static void jsm_carrier(struct jsm_channel *ch); |
37 | ||
1da177e4 LT |
38 | static inline int jsm_get_mstat(struct jsm_channel *ch) |
39 | { | |
40 | unsigned char mstat; | |
41 | unsigned result; | |
42 | ||
43 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
44 | ||
45 | mstat = (ch->ch_mostat | ch->ch_mistat); | |
46 | ||
47 | result = 0; | |
48 | ||
49 | if (mstat & UART_MCR_DTR) | |
50 | result |= TIOCM_DTR; | |
51 | if (mstat & UART_MCR_RTS) | |
52 | result |= TIOCM_RTS; | |
53 | if (mstat & UART_MSR_CTS) | |
54 | result |= TIOCM_CTS; | |
55 | if (mstat & UART_MSR_DSR) | |
56 | result |= TIOCM_DSR; | |
57 | if (mstat & UART_MSR_RI) | |
58 | result |= TIOCM_RI; | |
59 | if (mstat & UART_MSR_DCD) | |
60 | result |= TIOCM_CD; | |
61 | ||
62 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); | |
63 | return result; | |
64 | } | |
65 | ||
66 | static unsigned int jsm_tty_tx_empty(struct uart_port *port) | |
67 | { | |
68 | return TIOCSER_TEMT; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Return modem signals to ld. | |
73 | */ | |
74 | static unsigned int jsm_tty_get_mctrl(struct uart_port *port) | |
75 | { | |
76 | int result; | |
77 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
78 | ||
79 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
80 | ||
81 | result = jsm_get_mstat(channel); | |
82 | ||
83 | if (result < 0) | |
84 | return -ENXIO; | |
85 | ||
86 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
87 | ||
88 | return result; | |
89 | } | |
90 | ||
91 | /* | |
92 | * jsm_set_modem_info() | |
93 | * | |
94 | * Set modem signals, called by ld. | |
95 | */ | |
96 | static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
97 | { | |
98 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
99 | ||
100 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
101 | ||
102 | if (mctrl & TIOCM_RTS) | |
103 | channel->ch_mostat |= UART_MCR_RTS; | |
104 | else | |
105 | channel->ch_mostat &= ~UART_MCR_RTS; | |
106 | ||
107 | if (mctrl & TIOCM_DTR) | |
108 | channel->ch_mostat |= UART_MCR_DTR; | |
109 | else | |
110 | channel->ch_mostat &= ~UART_MCR_DTR; | |
111 | ||
112 | channel->ch_bd->bd_ops->assert_modem_signals(channel); | |
113 | ||
114 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
115 | udelay(10); | |
116 | } | |
117 | ||
b129a8cc | 118 | static void jsm_tty_start_tx(struct uart_port *port) |
1da177e4 LT |
119 | { |
120 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
121 | ||
122 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
123 | ||
124 | channel->ch_flags &= ~(CH_STOP); | |
125 | jsm_tty_write(port); | |
126 | ||
127 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
128 | } | |
129 | ||
b129a8cc | 130 | static void jsm_tty_stop_tx(struct uart_port *port) |
1da177e4 LT |
131 | { |
132 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
133 | ||
134 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
135 | ||
136 | channel->ch_flags |= (CH_STOP); | |
137 | ||
138 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
139 | } | |
140 | ||
141 | static void jsm_tty_send_xchar(struct uart_port *port, char ch) | |
142 | { | |
143 | unsigned long lock_flags; | |
144 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
606d099c | 145 | struct ktermios *termios; |
1da177e4 LT |
146 | |
147 | spin_lock_irqsave(&port->lock, lock_flags); | |
a58e00e7 JJ |
148 | termios = port->info->tty->termios; |
149 | if (ch == termios->c_cc[VSTART]) | |
1da177e4 LT |
150 | channel->ch_bd->bd_ops->send_start_character(channel); |
151 | ||
a58e00e7 | 152 | if (ch == termios->c_cc[VSTOP]) |
1da177e4 LT |
153 | channel->ch_bd->bd_ops->send_stop_character(channel); |
154 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
155 | } | |
156 | ||
157 | static void jsm_tty_stop_rx(struct uart_port *port) | |
158 | { | |
159 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
160 | ||
161 | channel->ch_bd->bd_ops->disable_receiver(channel); | |
162 | } | |
163 | ||
164 | static void jsm_tty_break(struct uart_port *port, int break_state) | |
165 | { | |
166 | unsigned long lock_flags; | |
167 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
168 | ||
169 | spin_lock_irqsave(&port->lock, lock_flags); | |
170 | if (break_state == -1) | |
171 | channel->ch_bd->bd_ops->send_break(channel); | |
172 | else | |
173 | channel->ch_bd->bd_ops->clear_break(channel, 0); | |
174 | ||
175 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
176 | } | |
177 | ||
178 | static int jsm_tty_open(struct uart_port *port) | |
179 | { | |
180 | struct jsm_board *brd; | |
181 | int rc = 0; | |
182 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
606d099c | 183 | struct ktermios *termios; |
1da177e4 LT |
184 | |
185 | /* Get board pointer from our array of majors we have allocated */ | |
186 | brd = channel->ch_bd; | |
187 | ||
188 | /* | |
189 | * Allocate channel buffers for read/write/error. | |
190 | * Set flag, so we don't get trounced on. | |
191 | */ | |
192 | channel->ch_flags |= (CH_OPENING); | |
193 | ||
194 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
195 | ||
196 | if (!channel->ch_rqueue) { | |
197 | channel->ch_rqueue = (u8 *) kmalloc(RQUEUESIZE, GFP_KERNEL); | |
198 | if (!channel->ch_rqueue) { | |
199 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
200 | "unable to allocate read queue buf"); | |
201 | return -ENOMEM; | |
202 | } | |
203 | memset(channel->ch_rqueue, 0, RQUEUESIZE); | |
204 | } | |
205 | if (!channel->ch_equeue) { | |
206 | channel->ch_equeue = (u8 *) kmalloc(EQUEUESIZE, GFP_KERNEL); | |
207 | if (!channel->ch_equeue) { | |
208 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
209 | "unable to allocate error queue buf"); | |
210 | return -ENOMEM; | |
211 | } | |
212 | memset(channel->ch_equeue, 0, EQUEUESIZE); | |
213 | } | |
214 | if (!channel->ch_wqueue) { | |
215 | channel->ch_wqueue = (u8 *) kmalloc(WQUEUESIZE, GFP_KERNEL); | |
216 | if (!channel->ch_wqueue) { | |
217 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
218 | "unable to allocate write queue buf"); | |
219 | return -ENOMEM; | |
220 | } | |
221 | memset(channel->ch_wqueue, 0, WQUEUESIZE); | |
222 | } | |
223 | ||
224 | channel->ch_flags &= ~(CH_OPENING); | |
225 | /* | |
226 | * Initialize if neither terminal is open. | |
227 | */ | |
228 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, | |
229 | "jsm_open: initializing channel in open...\n"); | |
230 | ||
231 | /* | |
232 | * Flush input queues. | |
233 | */ | |
234 | channel->ch_r_head = channel->ch_r_tail = 0; | |
235 | channel->ch_e_head = channel->ch_e_tail = 0; | |
236 | channel->ch_w_head = channel->ch_w_tail = 0; | |
237 | ||
238 | brd->bd_ops->flush_uart_write(channel); | |
239 | brd->bd_ops->flush_uart_read(channel); | |
240 | ||
241 | channel->ch_flags = 0; | |
242 | channel->ch_cached_lsr = 0; | |
243 | channel->ch_stops_sent = 0; | |
244 | ||
a58e00e7 JJ |
245 | termios = port->info->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]; | |
1da177e4 LT |
252 | |
253 | /* Tell UART to init itself */ | |
254 | brd->bd_ops->uart_init(channel); | |
255 | ||
256 | /* | |
257 | * Run param in case we changed anything | |
258 | */ | |
259 | brd->bd_ops->param(channel); | |
260 | ||
261 | jsm_carrier(channel); | |
262 | ||
263 | channel->ch_open_count++; | |
264 | ||
265 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
266 | return rc; | |
267 | } | |
268 | ||
269 | static void jsm_tty_close(struct uart_port *port) | |
270 | { | |
271 | struct jsm_board *bd; | |
606d099c | 272 | struct ktermios *ts; |
1da177e4 LT |
273 | struct jsm_channel *channel = (struct jsm_channel *)port; |
274 | ||
275 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
276 | ||
277 | bd = channel->ch_bd; | |
278 | ts = channel->uart_port.info->tty->termios; | |
279 | ||
280 | channel->ch_flags &= ~(CH_STOPI); | |
281 | ||
282 | channel->ch_open_count--; | |
283 | ||
284 | /* | |
285 | * If we have HUPCL set, lower DTR and RTS | |
286 | */ | |
287 | if (channel->ch_c_cflag & HUPCL) { | |
288 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, | |
289 | "Close. HUPCL set, dropping DTR/RTS\n"); | |
290 | ||
291 | /* Drop RTS/DTR */ | |
292 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
293 | bd->bd_ops->assert_modem_signals(channel); | |
294 | } | |
295 | ||
296 | channel->ch_old_baud = 0; | |
297 | ||
298 | /* Turn off UART interrupts for this port */ | |
299 | channel->ch_bd->bd_ops->uart_off(channel); | |
300 | ||
301 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
302 | } | |
303 | ||
304 | static void jsm_tty_set_termios(struct uart_port *port, | |
606d099c AC |
305 | struct ktermios *termios, |
306 | struct ktermios *old_termios) | |
1da177e4 LT |
307 | { |
308 | unsigned long lock_flags; | |
309 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
310 | ||
311 | spin_lock_irqsave(&port->lock, lock_flags); | |
312 | channel->ch_c_cflag = termios->c_cflag; | |
313 | channel->ch_c_iflag = termios->c_iflag; | |
314 | channel->ch_c_oflag = termios->c_oflag; | |
315 | channel->ch_c_lflag = termios->c_lflag; | |
316 | channel->ch_startc = termios->c_cc[VSTART]; | |
317 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
318 | ||
319 | channel->ch_bd->bd_ops->param(channel); | |
320 | jsm_carrier(channel); | |
321 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
322 | } | |
323 | ||
324 | static const char *jsm_tty_type(struct uart_port *port) | |
325 | { | |
326 | return "jsm"; | |
327 | } | |
328 | ||
329 | static void jsm_tty_release_port(struct uart_port *port) | |
330 | { | |
331 | } | |
332 | ||
333 | static int jsm_tty_request_port(struct uart_port *port) | |
334 | { | |
335 | return 0; | |
336 | } | |
337 | ||
338 | static void jsm_config_port(struct uart_port *port, int flags) | |
339 | { | |
340 | port->type = PORT_JSM; | |
341 | } | |
342 | ||
343 | static struct uart_ops jsm_ops = { | |
344 | .tx_empty = jsm_tty_tx_empty, | |
345 | .set_mctrl = jsm_tty_set_mctrl, | |
346 | .get_mctrl = jsm_tty_get_mctrl, | |
347 | .stop_tx = jsm_tty_stop_tx, | |
348 | .start_tx = jsm_tty_start_tx, | |
349 | .send_xchar = jsm_tty_send_xchar, | |
350 | .stop_rx = jsm_tty_stop_rx, | |
351 | .break_ctl = jsm_tty_break, | |
352 | .startup = jsm_tty_open, | |
353 | .shutdown = jsm_tty_close, | |
354 | .set_termios = jsm_tty_set_termios, | |
355 | .type = jsm_tty_type, | |
356 | .release_port = jsm_tty_release_port, | |
357 | .request_port = jsm_tty_request_port, | |
358 | .config_port = jsm_config_port, | |
359 | }; | |
360 | ||
361 | /* | |
362 | * jsm_tty_init() | |
363 | * | |
364 | * Init the tty subsystem. Called once per board after board has been | |
365 | * downloaded and init'ed. | |
366 | */ | |
367 | int jsm_tty_init(struct jsm_board *brd) | |
368 | { | |
369 | int i; | |
370 | void __iomem *vaddr; | |
371 | struct jsm_channel *ch; | |
372 | ||
373 | if (!brd) | |
374 | return -ENXIO; | |
375 | ||
376 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
377 | ||
378 | /* | |
379 | * Initialize board structure elements. | |
380 | */ | |
381 | ||
382 | brd->nasync = brd->maxports; | |
383 | ||
384 | /* | |
385 | * Allocate channel memory that might not have been allocated | |
386 | * when the driver was first loaded. | |
387 | */ | |
388 | for (i = 0; i < brd->nasync; i++) { | |
389 | if (!brd->channels[i]) { | |
390 | ||
391 | /* | |
392 | * Okay to malloc with GFP_KERNEL, we are not at | |
393 | * interrupt context, and there are no locks held. | |
394 | */ | |
395 | brd->channels[i] = kmalloc(sizeof(struct jsm_channel), GFP_KERNEL); | |
396 | if (!brd->channels[i]) { | |
397 | jsm_printk(CORE, ERR, &brd->pci_dev, | |
398 | "%s:%d Unable to allocate memory for channel struct\n", | |
399 | __FILE__, __LINE__); | |
400 | } | |
401 | memset(brd->channels[i], 0, sizeof(struct jsm_channel)); | |
402 | } | |
403 | } | |
404 | ||
405 | ch = brd->channels[0]; | |
406 | vaddr = brd->re_map_membase; | |
407 | ||
408 | /* Set up channel variables */ | |
409 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
410 | ||
411 | if (!brd->channels[i]) | |
412 | continue; | |
413 | ||
414 | spin_lock_init(&ch->ch_lock); | |
415 | ||
416 | if (brd->bd_uart_offset == 0x200) | |
417 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); | |
418 | ||
419 | ch->ch_bd = brd; | |
420 | ch->ch_portnum = i; | |
421 | ||
422 | /* .25 second delay */ | |
423 | ch->ch_close_delay = 250; | |
424 | ||
425 | init_waitqueue_head(&ch->ch_flags_wait); | |
426 | } | |
427 | ||
428 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | int jsm_uart_port_init(struct jsm_board *brd) | |
433 | { | |
434 | int i; | |
435 | struct jsm_channel *ch; | |
436 | ||
437 | if (!brd) | |
438 | return -ENXIO; | |
439 | ||
440 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
441 | ||
442 | /* | |
443 | * Initialize board structure elements. | |
444 | */ | |
445 | ||
446 | brd->nasync = brd->maxports; | |
447 | ||
448 | /* Set up channel variables */ | |
449 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[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.type = PORT_JSM; | |
456 | brd->channels[i]->uart_port.iotype = UPIO_MEM; | |
457 | brd->channels[i]->uart_port.membase = brd->re_map_membase; | |
458 | brd->channels[i]->uart_port.fifosize = 16; | |
459 | brd->channels[i]->uart_port.ops = &jsm_ops; | |
460 | brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2; | |
461 | if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port)) | |
462 | printk(KERN_INFO "Added device failed\n"); | |
463 | else | |
464 | printk(KERN_INFO "Added device \n"); | |
465 | } | |
466 | ||
467 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
468 | return 0; | |
469 | } | |
470 | ||
471 | int jsm_remove_uart_port(struct jsm_board *brd) | |
472 | { | |
473 | int i; | |
474 | struct jsm_channel *ch; | |
475 | ||
476 | if (!brd) | |
477 | return -ENXIO; | |
478 | ||
479 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
480 | ||
481 | /* | |
482 | * Initialize board structure elements. | |
483 | */ | |
484 | ||
485 | brd->nasync = brd->maxports; | |
486 | ||
487 | /* Set up channel variables */ | |
488 | for (i = 0; i < brd->nasync; i++) { | |
489 | ||
490 | if (!brd->channels[i]) | |
491 | continue; | |
492 | ||
493 | ch = brd->channels[i]; | |
494 | ||
495 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); | |
496 | } | |
497 | ||
498 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
499 | return 0; | |
500 | } | |
501 | ||
502 | void jsm_input(struct jsm_channel *ch) | |
503 | { | |
504 | struct jsm_board *bd; | |
505 | struct tty_struct *tp; | |
0a577ce3 | 506 | struct tty_ldisc *ld; |
1da177e4 LT |
507 | u32 rmask; |
508 | u16 head; | |
509 | u16 tail; | |
510 | int data_len; | |
511 | unsigned long lock_flags; | |
0a577ce3 | 512 | int flip_len = 0; |
1da177e4 LT |
513 | int len = 0; |
514 | int n = 0; | |
1da177e4 LT |
515 | int s = 0; |
516 | int i = 0; | |
517 | ||
518 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
519 | ||
520 | if (!ch) | |
521 | return; | |
522 | ||
523 | tp = ch->uart_port.info->tty; | |
524 | ||
525 | bd = ch->ch_bd; | |
526 | if(!bd) | |
527 | return; | |
528 | ||
529 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
530 | ||
531 | /* | |
532 | *Figure the number of characters in the buffer. | |
533 | *Exit immediately if none. | |
534 | */ | |
535 | ||
536 | rmask = RQUEUEMASK; | |
537 | ||
538 | head = ch->ch_r_head & rmask; | |
539 | tail = ch->ch_r_tail & rmask; | |
540 | ||
541 | data_len = (head - tail) & rmask; | |
542 | if (data_len == 0) { | |
543 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
544 | return; | |
545 | } | |
546 | ||
547 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
548 | ||
549 | /* | |
550 | *If the device is not open, or CREAD is off, flush | |
551 | *input data and return immediately. | |
552 | */ | |
553 | if (!tp || | |
554 | !(tp->termios->c_cflag & CREAD) ) { | |
555 | ||
556 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
557 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); | |
558 | ch->ch_r_head = tail; | |
559 | ||
560 | /* Force queue flow control to be released, if needed */ | |
561 | jsm_check_queue_flow_control(ch); | |
562 | ||
563 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
564 | return; | |
565 | } | |
566 | ||
567 | /* | |
568 | * If we are throttled, simply don't read any data. | |
569 | */ | |
570 | if (ch->ch_flags & CH_STOPI) { | |
571 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
572 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
573 | "Port %d throttled, not reading any data. head: %x tail: %x\n", | |
574 | ch->ch_portnum, head, tail); | |
575 | return; | |
576 | } | |
577 | ||
578 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); | |
579 | ||
580 | /* | |
581 | * If the rxbuf is empty and we are not throttled, put as much | |
0a577ce3 | 582 | * as we can directly into the linux TTY buffer. |
1da177e4 | 583 | * |
1da177e4 | 584 | */ |
0a577ce3 | 585 | flip_len = TTY_FLIPBUF_SIZE; |
1da177e4 LT |
586 | |
587 | len = min(data_len, flip_len); | |
588 | len = min(len, (N_TTY_BUF_SIZE - 1) - tp->read_cnt); | |
0a577ce3 | 589 | ld = tty_ldisc_ref(tp); |
1da177e4 | 590 | |
1da177e4 | 591 | /* |
0a577ce3 AK |
592 | * If we were unable to get a reference to the ld, |
593 | * don't flush our buffer, and act like the ld doesn't | |
594 | * have any space to put the data right now. | |
1da177e4 | 595 | */ |
0a577ce3 AK |
596 | if (!ld) { |
597 | len = 0; | |
1da177e4 | 598 | } else { |
0a577ce3 AK |
599 | /* |
600 | * If ld doesn't have a pointer to a receive_buf function, | |
601 | * flush the data, then act like the ld doesn't have any | |
602 | * space to put the data right now. | |
603 | */ | |
604 | if (!ld->receive_buf) { | |
605 | ch->ch_r_head = ch->ch_r_tail; | |
606 | len = 0; | |
607 | } | |
608 | } | |
609 | ||
610 | if (len <= 0) { | |
611 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
612 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); | |
613 | if (ld) | |
614 | tty_ldisc_deref(ld); | |
615 | return; | |
1da177e4 LT |
616 | } |
617 | ||
0a577ce3 | 618 | len = tty_buffer_request_room(tp, len); |
1da177e4 LT |
619 | n = len; |
620 | ||
621 | /* | |
622 | * n now contains the most amount of data we can copy, | |
623 | * bounded either by the flip buffer size or the amount | |
624 | * of data the card actually has pending... | |
625 | */ | |
626 | while (n) { | |
627 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
628 | s = min(s, n); | |
629 | ||
630 | if (s <= 0) | |
631 | break; | |
632 | ||
0a577ce3 AK |
633 | /* |
634 | * If conditions are such that ld needs to see all | |
635 | * UART errors, we will have to walk each character | |
636 | * and error byte and send them to the buffer one at | |
637 | * a time. | |
638 | */ | |
1da177e4 | 639 | |
1da177e4 | 640 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
0a577ce3 | 641 | for (i = 0; i < s; i++) { |
1da177e4 LT |
642 | /* |
643 | * Give the Linux ld the flags in the | |
644 | * format it likes. | |
645 | */ | |
0a577ce3 AK |
646 | if (*(ch->ch_equeue +tail +i) & UART_LSR_BI) |
647 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_BREAK); | |
648 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE) | |
649 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY); | |
650 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE) | |
651 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME); | |
1da177e4 | 652 | else |
0a577ce3 | 653 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL); |
1da177e4 LT |
654 | } |
655 | } else { | |
0a577ce3 | 656 | tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ; |
1da177e4 | 657 | } |
0a577ce3 AK |
658 | tail += s; |
659 | n -= s; | |
660 | /* Flip queue if needed */ | |
661 | tail &= rmask; | |
1da177e4 LT |
662 | } |
663 | ||
0a577ce3 AK |
664 | ch->ch_r_tail = tail & rmask; |
665 | ch->ch_e_tail = tail & rmask; | |
666 | jsm_check_queue_flow_control(ch); | |
667 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
1da177e4 | 668 | |
0a577ce3 AK |
669 | /* Tell the tty layer its okay to "eat" the data now */ |
670 | tty_flip_buffer_push(tp); | |
1da177e4 | 671 | |
0a577ce3 AK |
672 | if (ld) |
673 | tty_ldisc_deref(ld); | |
1da177e4 LT |
674 | |
675 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); | |
676 | } | |
677 | ||
408b664a | 678 | static void jsm_carrier(struct jsm_channel *ch) |
1da177e4 LT |
679 | { |
680 | struct jsm_board *bd; | |
681 | ||
682 | int virt_carrier = 0; | |
683 | int phys_carrier = 0; | |
684 | ||
685 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
686 | if (!ch) | |
687 | return; | |
688 | ||
689 | bd = ch->ch_bd; | |
690 | ||
691 | if (!bd) | |
692 | return; | |
693 | ||
694 | if (ch->ch_mistat & UART_MSR_DCD) { | |
695 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
696 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); | |
697 | phys_carrier = 1; | |
698 | } | |
699 | ||
700 | if (ch->ch_c_cflag & CLOCAL) | |
701 | virt_carrier = 1; | |
702 | ||
703 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
704 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); | |
705 | ||
706 | /* | |
707 | * Test for a VIRTUAL carrier transition to HIGH. | |
708 | */ | |
709 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
710 | ||
711 | /* | |
712 | * When carrier rises, wake any threads waiting | |
713 | * for carrier in the open routine. | |
714 | */ | |
715 | ||
716 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
717 | "carrier: virt DCD rose\n"); | |
718 | ||
719 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
720 | wake_up_interruptible(&ch->ch_flags_wait); | |
721 | } | |
722 | ||
723 | /* | |
724 | * Test for a PHYSICAL carrier transition to HIGH. | |
725 | */ | |
726 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
727 | ||
728 | /* | |
729 | * When carrier rises, wake any threads waiting | |
730 | * for carrier in the open routine. | |
731 | */ | |
732 | ||
733 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
734 | "carrier: physical DCD rose\n"); | |
735 | ||
736 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
737 | wake_up_interruptible(&ch->ch_flags_wait); | |
738 | } | |
739 | ||
740 | /* | |
741 | * Test for a PHYSICAL transition to low, so long as we aren't | |
742 | * currently ignoring physical transitions (which is what "virtual | |
743 | * carrier" indicates). | |
744 | * | |
745 | * The transition of the virtual carrier to low really doesn't | |
746 | * matter... it really only means "ignore carrier state", not | |
747 | * "make pretend that carrier is there". | |
748 | */ | |
749 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) | |
750 | && (phys_carrier == 0)) { | |
751 | /* | |
752 | * When carrier drops: | |
753 | * | |
754 | * Drop carrier on all open units. | |
755 | * | |
756 | * Flush queues, waking up any task waiting in the | |
757 | * line discipline. | |
758 | * | |
759 | * Send a hangup to the control terminal. | |
760 | * | |
761 | * Enable all select calls. | |
762 | */ | |
763 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
764 | wake_up_interruptible(&ch->ch_flags_wait); | |
765 | } | |
766 | ||
767 | /* | |
768 | * Make sure that our cached values reflect the current reality. | |
769 | */ | |
770 | if (virt_carrier == 1) | |
771 | ch->ch_flags |= CH_FCAR; | |
772 | else | |
773 | ch->ch_flags &= ~CH_FCAR; | |
774 | ||
775 | if (phys_carrier == 1) | |
776 | ch->ch_flags |= CH_CD; | |
777 | else | |
778 | ch->ch_flags &= ~CH_CD; | |
779 | } | |
780 | ||
781 | ||
782 | void jsm_check_queue_flow_control(struct jsm_channel *ch) | |
783 | { | |
a58e00e7 | 784 | struct board_ops *bd_ops = ch->ch_bd->bd_ops; |
1da177e4 LT |
785 | int qleft = 0; |
786 | ||
787 | /* Store how much space we have left in the queue */ | |
788 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) | |
789 | qleft += RQUEUEMASK + 1; | |
790 | ||
791 | /* | |
792 | * Check to see if we should enforce flow control on our queue because | |
793 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
794 | * | |
795 | * NOTE: This is done based on what the current flow control of the | |
796 | * port is set for. | |
797 | * | |
798 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
799 | * This will cause the UART's FIFO to back up, and force | |
800 | * the RTS signal to be dropped. | |
801 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
802 | * the other side, in hopes it will stop sending data to us. | |
803 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
804 | * that gets sent into us when the queue fills up. | |
805 | */ | |
806 | if (qleft < 256) { | |
807 | /* HWFLOW */ | |
808 | if (ch->ch_c_cflag & CRTSCTS) { | |
809 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { | |
a58e00e7 | 810 | bd_ops->disable_receiver(ch); |
1da177e4 LT |
811 | ch->ch_flags |= (CH_RECEIVER_OFF); |
812 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
813 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", | |
814 | qleft); | |
815 | } | |
816 | } | |
817 | /* SWFLOW */ | |
818 | else if (ch->ch_c_iflag & IXOFF) { | |
819 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
a58e00e7 | 820 | bd_ops->send_stop_character(ch); |
1da177e4 LT |
821 | ch->ch_stops_sent++; |
822 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
823 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); | |
824 | } | |
825 | } | |
826 | } | |
827 | ||
828 | /* | |
829 | * Check to see if we should unenforce flow control because | |
830 | * ld (or user) finally read enuf data out of our queue. | |
831 | * | |
832 | * NOTE: This is done based on what the current flow control of the | |
833 | * port is set for. | |
834 | * | |
835 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
836 | * This will cause the UART's FIFO to raise RTS back up, | |
837 | * which will allow the other side to start sending data again. | |
838 | * 2) SWFLOW (IXOFF) - Send a start character to | |
839 | * the other side, so it will start sending data to us again. | |
840 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
841 | * other side, we don't need to do anything now. | |
842 | */ | |
843 | if (qleft > (RQUEUESIZE / 2)) { | |
844 | /* HWFLOW */ | |
845 | if (ch->ch_c_cflag & CRTSCTS) { | |
846 | if (ch->ch_flags & CH_RECEIVER_OFF) { | |
a58e00e7 | 847 | bd_ops->enable_receiver(ch); |
1da177e4 LT |
848 | ch->ch_flags &= ~(CH_RECEIVER_OFF); |
849 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
850 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", | |
851 | qleft); | |
852 | } | |
853 | } | |
854 | /* SWFLOW */ | |
855 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
856 | ch->ch_stops_sent = 0; | |
a58e00e7 | 857 | bd_ops->send_start_character(ch); |
1da177e4 LT |
858 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); |
859 | } | |
860 | } | |
861 | } | |
862 | ||
863 | /* | |
864 | * jsm_tty_write() | |
865 | * | |
866 | * Take data from the user or kernel and send it out to the FEP. | |
867 | * In here exists all the Transparent Print magic as well. | |
868 | */ | |
869 | int jsm_tty_write(struct uart_port *port) | |
870 | { | |
871 | int bufcount = 0, n = 0; | |
872 | int data_count = 0,data_count1 =0; | |
873 | u16 head; | |
874 | u16 tail; | |
875 | u16 tmask; | |
876 | u32 remain; | |
877 | int temp_tail = port->info->xmit.tail; | |
878 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
879 | ||
880 | tmask = WQUEUEMASK; | |
881 | head = (channel->ch_w_head) & tmask; | |
882 | tail = (channel->ch_w_tail) & tmask; | |
883 | ||
884 | if ((bufcount = tail - head - 1) < 0) | |
885 | bufcount += WQUEUESIZE; | |
886 | ||
887 | n = bufcount; | |
888 | ||
889 | n = min(n, 56); | |
890 | remain = WQUEUESIZE - head; | |
891 | ||
892 | data_count = 0; | |
893 | if (n >= remain) { | |
894 | n -= remain; | |
895 | while ((port->info->xmit.head != temp_tail) && | |
896 | (data_count < remain)) { | |
897 | channel->ch_wqueue[head++] = | |
898 | port->info->xmit.buf[temp_tail]; | |
899 | ||
900 | temp_tail++; | |
901 | temp_tail &= (UART_XMIT_SIZE - 1); | |
902 | data_count++; | |
903 | } | |
904 | if (data_count == remain) head = 0; | |
905 | } | |
906 | ||
907 | data_count1 = 0; | |
908 | if (n > 0) { | |
909 | remain = n; | |
910 | while ((port->info->xmit.head != temp_tail) && | |
911 | (data_count1 < remain)) { | |
912 | channel->ch_wqueue[head++] = | |
913 | port->info->xmit.buf[temp_tail]; | |
914 | ||
915 | temp_tail++; | |
916 | temp_tail &= (UART_XMIT_SIZE - 1); | |
917 | data_count1++; | |
918 | ||
919 | } | |
920 | } | |
921 | ||
922 | port->info->xmit.tail = temp_tail; | |
923 | ||
924 | data_count += data_count1; | |
925 | if (data_count) { | |
926 | head &= tmask; | |
927 | channel->ch_w_head = head; | |
928 | } | |
929 | ||
930 | if (data_count) { | |
931 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); | |
932 | } | |
933 | ||
934 | return data_count; | |
935 | } |