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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> | |
23 | * Wendy Xiong <wendyx@us.ltcfwd.linux.ibm.com> | |
24 | * | |
25 | ***********************************************************************/ | |
26 | #include <linux/tty.h> | |
27 | #include <linux/tty_flip.h> | |
28 | #include <linux/serial_reg.h> | |
29 | #include <linux/delay.h> /* For udelay */ | |
30 | #include <linux/pci.h> | |
31 | ||
32 | #include "jsm.h" | |
33 | ||
408b664a AB |
34 | static void jsm_carrier(struct jsm_channel *ch); |
35 | ||
1da177e4 LT |
36 | static inline int jsm_get_mstat(struct jsm_channel *ch) |
37 | { | |
38 | unsigned char mstat; | |
39 | unsigned result; | |
40 | ||
41 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
42 | ||
43 | mstat = (ch->ch_mostat | ch->ch_mistat); | |
44 | ||
45 | result = 0; | |
46 | ||
47 | if (mstat & UART_MCR_DTR) | |
48 | result |= TIOCM_DTR; | |
49 | if (mstat & UART_MCR_RTS) | |
50 | result |= TIOCM_RTS; | |
51 | if (mstat & UART_MSR_CTS) | |
52 | result |= TIOCM_CTS; | |
53 | if (mstat & UART_MSR_DSR) | |
54 | result |= TIOCM_DSR; | |
55 | if (mstat & UART_MSR_RI) | |
56 | result |= TIOCM_RI; | |
57 | if (mstat & UART_MSR_DCD) | |
58 | result |= TIOCM_CD; | |
59 | ||
60 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); | |
61 | return result; | |
62 | } | |
63 | ||
64 | static unsigned int jsm_tty_tx_empty(struct uart_port *port) | |
65 | { | |
66 | return TIOCSER_TEMT; | |
67 | } | |
68 | ||
69 | /* | |
70 | * Return modem signals to ld. | |
71 | */ | |
72 | static unsigned int jsm_tty_get_mctrl(struct uart_port *port) | |
73 | { | |
74 | int result; | |
75 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
76 | ||
77 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
78 | ||
79 | result = jsm_get_mstat(channel); | |
80 | ||
81 | if (result < 0) | |
82 | return -ENXIO; | |
83 | ||
84 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
85 | ||
86 | return result; | |
87 | } | |
88 | ||
89 | /* | |
90 | * jsm_set_modem_info() | |
91 | * | |
92 | * Set modem signals, called by ld. | |
93 | */ | |
94 | static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
95 | { | |
96 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
97 | ||
98 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
99 | ||
100 | if (mctrl & TIOCM_RTS) | |
101 | channel->ch_mostat |= UART_MCR_RTS; | |
102 | else | |
103 | channel->ch_mostat &= ~UART_MCR_RTS; | |
104 | ||
105 | if (mctrl & TIOCM_DTR) | |
106 | channel->ch_mostat |= UART_MCR_DTR; | |
107 | else | |
108 | channel->ch_mostat &= ~UART_MCR_DTR; | |
109 | ||
110 | channel->ch_bd->bd_ops->assert_modem_signals(channel); | |
111 | ||
112 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
113 | udelay(10); | |
114 | } | |
115 | ||
116 | static void jsm_tty_start_tx(struct uart_port *port, unsigned int tty_start) | |
117 | { | |
118 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
119 | ||
120 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
121 | ||
122 | channel->ch_flags &= ~(CH_STOP); | |
123 | jsm_tty_write(port); | |
124 | ||
125 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
126 | } | |
127 | ||
128 | static void jsm_tty_stop_tx(struct uart_port *port, unsigned int tty_stop) | |
129 | { | |
130 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
131 | ||
132 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
133 | ||
134 | channel->ch_flags |= (CH_STOP); | |
135 | ||
136 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
137 | } | |
138 | ||
139 | static void jsm_tty_send_xchar(struct uart_port *port, char ch) | |
140 | { | |
141 | unsigned long lock_flags; | |
142 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
143 | ||
144 | spin_lock_irqsave(&port->lock, lock_flags); | |
145 | if (ch == port->info->tty->termios->c_cc[VSTART]) | |
146 | channel->ch_bd->bd_ops->send_start_character(channel); | |
147 | ||
148 | if (ch == port->info->tty->termios->c_cc[VSTOP]) | |
149 | channel->ch_bd->bd_ops->send_stop_character(channel); | |
150 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
151 | } | |
152 | ||
153 | static void jsm_tty_stop_rx(struct uart_port *port) | |
154 | { | |
155 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
156 | ||
157 | channel->ch_bd->bd_ops->disable_receiver(channel); | |
158 | } | |
159 | ||
160 | static void jsm_tty_break(struct uart_port *port, int break_state) | |
161 | { | |
162 | unsigned long lock_flags; | |
163 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
164 | ||
165 | spin_lock_irqsave(&port->lock, lock_flags); | |
166 | if (break_state == -1) | |
167 | channel->ch_bd->bd_ops->send_break(channel); | |
168 | else | |
169 | channel->ch_bd->bd_ops->clear_break(channel, 0); | |
170 | ||
171 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
172 | } | |
173 | ||
174 | static int jsm_tty_open(struct uart_port *port) | |
175 | { | |
176 | struct jsm_board *brd; | |
177 | int rc = 0; | |
178 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
179 | ||
180 | /* Get board pointer from our array of majors we have allocated */ | |
181 | brd = channel->ch_bd; | |
182 | ||
183 | /* | |
184 | * Allocate channel buffers for read/write/error. | |
185 | * Set flag, so we don't get trounced on. | |
186 | */ | |
187 | channel->ch_flags |= (CH_OPENING); | |
188 | ||
189 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
190 | ||
191 | if (!channel->ch_rqueue) { | |
192 | channel->ch_rqueue = (u8 *) kmalloc(RQUEUESIZE, GFP_KERNEL); | |
193 | if (!channel->ch_rqueue) { | |
194 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
195 | "unable to allocate read queue buf"); | |
196 | return -ENOMEM; | |
197 | } | |
198 | memset(channel->ch_rqueue, 0, RQUEUESIZE); | |
199 | } | |
200 | if (!channel->ch_equeue) { | |
201 | channel->ch_equeue = (u8 *) kmalloc(EQUEUESIZE, GFP_KERNEL); | |
202 | if (!channel->ch_equeue) { | |
203 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
204 | "unable to allocate error queue buf"); | |
205 | return -ENOMEM; | |
206 | } | |
207 | memset(channel->ch_equeue, 0, EQUEUESIZE); | |
208 | } | |
209 | if (!channel->ch_wqueue) { | |
210 | channel->ch_wqueue = (u8 *) kmalloc(WQUEUESIZE, GFP_KERNEL); | |
211 | if (!channel->ch_wqueue) { | |
212 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
213 | "unable to allocate write queue buf"); | |
214 | return -ENOMEM; | |
215 | } | |
216 | memset(channel->ch_wqueue, 0, WQUEUESIZE); | |
217 | } | |
218 | ||
219 | channel->ch_flags &= ~(CH_OPENING); | |
220 | /* | |
221 | * Initialize if neither terminal is open. | |
222 | */ | |
223 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, | |
224 | "jsm_open: initializing channel in open...\n"); | |
225 | ||
226 | /* | |
227 | * Flush input queues. | |
228 | */ | |
229 | channel->ch_r_head = channel->ch_r_tail = 0; | |
230 | channel->ch_e_head = channel->ch_e_tail = 0; | |
231 | channel->ch_w_head = channel->ch_w_tail = 0; | |
232 | ||
233 | brd->bd_ops->flush_uart_write(channel); | |
234 | brd->bd_ops->flush_uart_read(channel); | |
235 | ||
236 | channel->ch_flags = 0; | |
237 | channel->ch_cached_lsr = 0; | |
238 | channel->ch_stops_sent = 0; | |
239 | ||
240 | channel->ch_c_cflag = port->info->tty->termios->c_cflag; | |
241 | channel->ch_c_iflag = port->info->tty->termios->c_iflag; | |
242 | channel->ch_c_oflag = port->info->tty->termios->c_oflag; | |
243 | channel->ch_c_lflag = port->info->tty->termios->c_lflag; | |
244 | channel->ch_startc = port->info->tty->termios->c_cc[VSTART]; | |
245 | channel->ch_stopc = port->info->tty->termios->c_cc[VSTOP]; | |
246 | ||
247 | /* Tell UART to init itself */ | |
248 | brd->bd_ops->uart_init(channel); | |
249 | ||
250 | /* | |
251 | * Run param in case we changed anything | |
252 | */ | |
253 | brd->bd_ops->param(channel); | |
254 | ||
255 | jsm_carrier(channel); | |
256 | ||
257 | channel->ch_open_count++; | |
258 | ||
259 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
260 | return rc; | |
261 | } | |
262 | ||
263 | static void jsm_tty_close(struct uart_port *port) | |
264 | { | |
265 | struct jsm_board *bd; | |
266 | struct termios *ts; | |
267 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
268 | ||
269 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
270 | ||
271 | bd = channel->ch_bd; | |
272 | ts = channel->uart_port.info->tty->termios; | |
273 | ||
274 | channel->ch_flags &= ~(CH_STOPI); | |
275 | ||
276 | channel->ch_open_count--; | |
277 | ||
278 | /* | |
279 | * If we have HUPCL set, lower DTR and RTS | |
280 | */ | |
281 | if (channel->ch_c_cflag & HUPCL) { | |
282 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, | |
283 | "Close. HUPCL set, dropping DTR/RTS\n"); | |
284 | ||
285 | /* Drop RTS/DTR */ | |
286 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
287 | bd->bd_ops->assert_modem_signals(channel); | |
288 | } | |
289 | ||
290 | channel->ch_old_baud = 0; | |
291 | ||
292 | /* Turn off UART interrupts for this port */ | |
293 | channel->ch_bd->bd_ops->uart_off(channel); | |
294 | ||
295 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
296 | } | |
297 | ||
298 | static void jsm_tty_set_termios(struct uart_port *port, | |
299 | struct termios *termios, | |
300 | struct termios *old_termios) | |
301 | { | |
302 | unsigned long lock_flags; | |
303 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
304 | ||
305 | spin_lock_irqsave(&port->lock, lock_flags); | |
306 | channel->ch_c_cflag = termios->c_cflag; | |
307 | channel->ch_c_iflag = termios->c_iflag; | |
308 | channel->ch_c_oflag = termios->c_oflag; | |
309 | channel->ch_c_lflag = termios->c_lflag; | |
310 | channel->ch_startc = termios->c_cc[VSTART]; | |
311 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
312 | ||
313 | channel->ch_bd->bd_ops->param(channel); | |
314 | jsm_carrier(channel); | |
315 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
316 | } | |
317 | ||
318 | static const char *jsm_tty_type(struct uart_port *port) | |
319 | { | |
320 | return "jsm"; | |
321 | } | |
322 | ||
323 | static void jsm_tty_release_port(struct uart_port *port) | |
324 | { | |
325 | } | |
326 | ||
327 | static int jsm_tty_request_port(struct uart_port *port) | |
328 | { | |
329 | return 0; | |
330 | } | |
331 | ||
332 | static void jsm_config_port(struct uart_port *port, int flags) | |
333 | { | |
334 | port->type = PORT_JSM; | |
335 | } | |
336 | ||
337 | static struct uart_ops jsm_ops = { | |
338 | .tx_empty = jsm_tty_tx_empty, | |
339 | .set_mctrl = jsm_tty_set_mctrl, | |
340 | .get_mctrl = jsm_tty_get_mctrl, | |
341 | .stop_tx = jsm_tty_stop_tx, | |
342 | .start_tx = jsm_tty_start_tx, | |
343 | .send_xchar = jsm_tty_send_xchar, | |
344 | .stop_rx = jsm_tty_stop_rx, | |
345 | .break_ctl = jsm_tty_break, | |
346 | .startup = jsm_tty_open, | |
347 | .shutdown = jsm_tty_close, | |
348 | .set_termios = jsm_tty_set_termios, | |
349 | .type = jsm_tty_type, | |
350 | .release_port = jsm_tty_release_port, | |
351 | .request_port = jsm_tty_request_port, | |
352 | .config_port = jsm_config_port, | |
353 | }; | |
354 | ||
355 | /* | |
356 | * jsm_tty_init() | |
357 | * | |
358 | * Init the tty subsystem. Called once per board after board has been | |
359 | * downloaded and init'ed. | |
360 | */ | |
361 | int jsm_tty_init(struct jsm_board *brd) | |
362 | { | |
363 | int i; | |
364 | void __iomem *vaddr; | |
365 | struct jsm_channel *ch; | |
366 | ||
367 | if (!brd) | |
368 | return -ENXIO; | |
369 | ||
370 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
371 | ||
372 | /* | |
373 | * Initialize board structure elements. | |
374 | */ | |
375 | ||
376 | brd->nasync = brd->maxports; | |
377 | ||
378 | /* | |
379 | * Allocate channel memory that might not have been allocated | |
380 | * when the driver was first loaded. | |
381 | */ | |
382 | for (i = 0; i < brd->nasync; i++) { | |
383 | if (!brd->channels[i]) { | |
384 | ||
385 | /* | |
386 | * Okay to malloc with GFP_KERNEL, we are not at | |
387 | * interrupt context, and there are no locks held. | |
388 | */ | |
389 | brd->channels[i] = kmalloc(sizeof(struct jsm_channel), GFP_KERNEL); | |
390 | if (!brd->channels[i]) { | |
391 | jsm_printk(CORE, ERR, &brd->pci_dev, | |
392 | "%s:%d Unable to allocate memory for channel struct\n", | |
393 | __FILE__, __LINE__); | |
394 | } | |
395 | memset(brd->channels[i], 0, sizeof(struct jsm_channel)); | |
396 | } | |
397 | } | |
398 | ||
399 | ch = brd->channels[0]; | |
400 | vaddr = brd->re_map_membase; | |
401 | ||
402 | /* Set up channel variables */ | |
403 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
404 | ||
405 | if (!brd->channels[i]) | |
406 | continue; | |
407 | ||
408 | spin_lock_init(&ch->ch_lock); | |
409 | ||
410 | if (brd->bd_uart_offset == 0x200) | |
411 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); | |
412 | ||
413 | ch->ch_bd = brd; | |
414 | ch->ch_portnum = i; | |
415 | ||
416 | /* .25 second delay */ | |
417 | ch->ch_close_delay = 250; | |
418 | ||
419 | init_waitqueue_head(&ch->ch_flags_wait); | |
420 | } | |
421 | ||
422 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
423 | return 0; | |
424 | } | |
425 | ||
426 | int jsm_uart_port_init(struct jsm_board *brd) | |
427 | { | |
428 | int i; | |
429 | struct jsm_channel *ch; | |
430 | ||
431 | if (!brd) | |
432 | return -ENXIO; | |
433 | ||
434 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
435 | ||
436 | /* | |
437 | * Initialize board structure elements. | |
438 | */ | |
439 | ||
440 | brd->nasync = brd->maxports; | |
441 | ||
442 | /* Set up channel variables */ | |
443 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
444 | ||
445 | if (!brd->channels[i]) | |
446 | continue; | |
447 | ||
448 | brd->channels[i]->uart_port.irq = brd->irq; | |
449 | brd->channels[i]->uart_port.type = PORT_JSM; | |
450 | brd->channels[i]->uart_port.iotype = UPIO_MEM; | |
451 | brd->channels[i]->uart_port.membase = brd->re_map_membase; | |
452 | brd->channels[i]->uart_port.fifosize = 16; | |
453 | brd->channels[i]->uart_port.ops = &jsm_ops; | |
454 | brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2; | |
455 | if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port)) | |
456 | printk(KERN_INFO "Added device failed\n"); | |
457 | else | |
458 | printk(KERN_INFO "Added device \n"); | |
459 | } | |
460 | ||
461 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
462 | return 0; | |
463 | } | |
464 | ||
465 | int jsm_remove_uart_port(struct jsm_board *brd) | |
466 | { | |
467 | int i; | |
468 | struct jsm_channel *ch; | |
469 | ||
470 | if (!brd) | |
471 | return -ENXIO; | |
472 | ||
473 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
474 | ||
475 | /* | |
476 | * Initialize board structure elements. | |
477 | */ | |
478 | ||
479 | brd->nasync = brd->maxports; | |
480 | ||
481 | /* Set up channel variables */ | |
482 | for (i = 0; i < brd->nasync; i++) { | |
483 | ||
484 | if (!brd->channels[i]) | |
485 | continue; | |
486 | ||
487 | ch = brd->channels[i]; | |
488 | ||
489 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); | |
490 | } | |
491 | ||
492 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
493 | return 0; | |
494 | } | |
495 | ||
496 | void jsm_input(struct jsm_channel *ch) | |
497 | { | |
498 | struct jsm_board *bd; | |
499 | struct tty_struct *tp; | |
500 | u32 rmask; | |
501 | u16 head; | |
502 | u16 tail; | |
503 | int data_len; | |
504 | unsigned long lock_flags; | |
505 | int flip_len; | |
506 | int len = 0; | |
507 | int n = 0; | |
508 | char *buf = NULL; | |
509 | char *buf2 = NULL; | |
510 | int s = 0; | |
511 | int i = 0; | |
512 | ||
513 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
514 | ||
515 | if (!ch) | |
516 | return; | |
517 | ||
518 | tp = ch->uart_port.info->tty; | |
519 | ||
520 | bd = ch->ch_bd; | |
521 | if(!bd) | |
522 | return; | |
523 | ||
524 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
525 | ||
526 | /* | |
527 | *Figure the number of characters in the buffer. | |
528 | *Exit immediately if none. | |
529 | */ | |
530 | ||
531 | rmask = RQUEUEMASK; | |
532 | ||
533 | head = ch->ch_r_head & rmask; | |
534 | tail = ch->ch_r_tail & rmask; | |
535 | ||
536 | data_len = (head - tail) & rmask; | |
537 | if (data_len == 0) { | |
538 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
539 | return; | |
540 | } | |
541 | ||
542 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
543 | ||
544 | /* | |
545 | *If the device is not open, or CREAD is off, flush | |
546 | *input data and return immediately. | |
547 | */ | |
548 | if (!tp || | |
549 | !(tp->termios->c_cflag & CREAD) ) { | |
550 | ||
551 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
552 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); | |
553 | ch->ch_r_head = tail; | |
554 | ||
555 | /* Force queue flow control to be released, if needed */ | |
556 | jsm_check_queue_flow_control(ch); | |
557 | ||
558 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
559 | return; | |
560 | } | |
561 | ||
562 | /* | |
563 | * If we are throttled, simply don't read any data. | |
564 | */ | |
565 | if (ch->ch_flags & CH_STOPI) { | |
566 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
567 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
568 | "Port %d throttled, not reading any data. head: %x tail: %x\n", | |
569 | ch->ch_portnum, head, tail); | |
570 | return; | |
571 | } | |
572 | ||
573 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); | |
574 | ||
575 | /* | |
576 | * If the rxbuf is empty and we are not throttled, put as much | |
577 | * as we can directly into the linux TTY flip buffer. | |
578 | * The jsm_rawreadok case takes advantage of carnal knowledge that | |
579 | * the char_buf and the flag_buf are next to each other and | |
580 | * are each of (2 * TTY_FLIPBUF_SIZE) size. | |
581 | * | |
582 | * NOTE: if(!tty->real_raw), the call to ldisc.receive_buf | |
583 | *actually still uses the flag buffer, so you can't | |
584 | *use it for input data | |
585 | */ | |
586 | if (jsm_rawreadok) { | |
587 | if (tp->real_raw) | |
588 | flip_len = MYFLIPLEN; | |
589 | else | |
590 | flip_len = 2 * TTY_FLIPBUF_SIZE; | |
591 | } else | |
592 | flip_len = TTY_FLIPBUF_SIZE - tp->flip.count; | |
593 | ||
594 | len = min(data_len, flip_len); | |
595 | len = min(len, (N_TTY_BUF_SIZE - 1) - tp->read_cnt); | |
596 | ||
597 | if (len <= 0) { | |
598 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
599 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); | |
600 | return; | |
601 | } | |
602 | ||
603 | /* | |
604 | * If we're bypassing flip buffers on rx, we can blast it | |
605 | * right into the beginning of the buffer. | |
606 | */ | |
607 | if (jsm_rawreadok) { | |
608 | if (tp->real_raw) { | |
609 | if (ch->ch_flags & CH_FLIPBUF_IN_USE) { | |
610 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
611 | "JSM - FLIPBUF in use. delaying input\n"); | |
612 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
613 | return; | |
614 | } | |
615 | ch->ch_flags |= CH_FLIPBUF_IN_USE; | |
616 | buf = ch->ch_bd->flipbuf; | |
617 | buf2 = NULL; | |
618 | } else { | |
619 | buf = tp->flip.char_buf; | |
620 | buf2 = tp->flip.flag_buf; | |
621 | } | |
622 | } else { | |
623 | buf = tp->flip.char_buf_ptr; | |
624 | buf2 = tp->flip.flag_buf_ptr; | |
625 | } | |
626 | ||
627 | n = len; | |
628 | ||
629 | /* | |
630 | * n now contains the most amount of data we can copy, | |
631 | * bounded either by the flip buffer size or the amount | |
632 | * of data the card actually has pending... | |
633 | */ | |
634 | while (n) { | |
635 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
636 | s = min(s, n); | |
637 | ||
638 | if (s <= 0) | |
639 | break; | |
640 | ||
641 | memcpy(buf, ch->ch_rqueue + tail, s); | |
642 | ||
643 | /* buf2 is only set when port isn't raw */ | |
644 | if (buf2) | |
645 | memcpy(buf2, ch->ch_equeue + tail, s); | |
646 | ||
647 | tail += s; | |
648 | buf += s; | |
649 | if (buf2) | |
650 | buf2 += s; | |
651 | n -= s; | |
652 | /* Flip queue if needed */ | |
653 | tail &= rmask; | |
654 | } | |
655 | ||
656 | /* | |
657 | * In high performance mode, we don't have to update | |
658 | * flag_buf or any of the counts or pointers into flip buf. | |
659 | */ | |
660 | if (!jsm_rawreadok) { | |
661 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { | |
662 | for (i = 0; i < len; i++) { | |
663 | /* | |
664 | * Give the Linux ld the flags in the | |
665 | * format it likes. | |
666 | */ | |
667 | if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI) | |
668 | tp->flip.flag_buf_ptr[i] = TTY_BREAK; | |
669 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE) | |
670 | tp->flip.flag_buf_ptr[i] = TTY_PARITY; | |
671 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE) | |
672 | tp->flip.flag_buf_ptr[i] = TTY_FRAME; | |
673 | else | |
674 | tp->flip.flag_buf_ptr[i] = TTY_NORMAL; | |
675 | } | |
676 | } else { | |
677 | memset(tp->flip.flag_buf_ptr, 0, len); | |
678 | } | |
679 | ||
680 | tp->flip.char_buf_ptr += len; | |
681 | tp->flip.flag_buf_ptr += len; | |
682 | tp->flip.count += len; | |
683 | } | |
684 | else if (!tp->real_raw) { | |
685 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { | |
686 | for (i = 0; i < len; i++) { | |
687 | /* | |
688 | * Give the Linux ld the flags in the | |
689 | * format it likes. | |
690 | */ | |
691 | if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI) | |
692 | tp->flip.flag_buf_ptr[i] = TTY_BREAK; | |
693 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE) | |
694 | tp->flip.flag_buf_ptr[i] = TTY_PARITY; | |
695 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE) | |
696 | tp->flip.flag_buf_ptr[i] = TTY_FRAME; | |
697 | else | |
698 | tp->flip.flag_buf_ptr[i] = TTY_NORMAL; | |
699 | } | |
700 | } else | |
701 | memset(tp->flip.flag_buf, 0, len); | |
702 | } | |
703 | ||
704 | /* | |
705 | * If we're doing raw reads, jam it right into the | |
706 | * line disc bypassing the flip buffers. | |
707 | */ | |
708 | if (jsm_rawreadok) { | |
709 | if (tp->real_raw) { | |
710 | ch->ch_r_tail = tail & rmask; | |
711 | ch->ch_e_tail = tail & rmask; | |
712 | ||
713 | jsm_check_queue_flow_control(ch); | |
714 | ||
715 | /* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */ | |
716 | ||
717 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
718 | ||
719 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
720 | "jsm_input. %d real_raw len:%d calling receive_buf for board %d\n", | |
721 | __LINE__, len, ch->ch_bd->boardnum); | |
722 | tp->ldisc.receive_buf(tp, ch->ch_bd->flipbuf, NULL, len); | |
723 | ||
724 | /* Allow use of channel flip buffer again */ | |
725 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
726 | ch->ch_flags &= ~CH_FLIPBUF_IN_USE; | |
727 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
728 | ||
729 | } else { | |
730 | ch->ch_r_tail = tail & rmask; | |
731 | ch->ch_e_tail = tail & rmask; | |
732 | ||
733 | jsm_check_queue_flow_control(ch); | |
734 | ||
735 | /* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */ | |
736 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
737 | ||
738 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
739 | "jsm_input. %d not real_raw len:%d calling receive_buf for board %d\n", | |
740 | __LINE__, len, ch->ch_bd->boardnum); | |
741 | ||
742 | tp->ldisc.receive_buf(tp, tp->flip.char_buf, tp->flip.flag_buf, len); | |
743 | } | |
744 | } else { | |
745 | ch->ch_r_tail = tail & rmask; | |
746 | ch->ch_e_tail = tail & rmask; | |
747 | ||
748 | jsm_check_queue_flow_control(ch); | |
749 | ||
750 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
751 | ||
752 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
753 | "jsm_input. %d not jsm_read raw okay scheduling flip\n", __LINE__); | |
754 | tty_schedule_flip(tp); | |
755 | } | |
756 | ||
757 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); | |
758 | } | |
759 | ||
408b664a | 760 | static void jsm_carrier(struct jsm_channel *ch) |
1da177e4 LT |
761 | { |
762 | struct jsm_board *bd; | |
763 | ||
764 | int virt_carrier = 0; | |
765 | int phys_carrier = 0; | |
766 | ||
767 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
768 | if (!ch) | |
769 | return; | |
770 | ||
771 | bd = ch->ch_bd; | |
772 | ||
773 | if (!bd) | |
774 | return; | |
775 | ||
776 | if (ch->ch_mistat & UART_MSR_DCD) { | |
777 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
778 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); | |
779 | phys_carrier = 1; | |
780 | } | |
781 | ||
782 | if (ch->ch_c_cflag & CLOCAL) | |
783 | virt_carrier = 1; | |
784 | ||
785 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
786 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); | |
787 | ||
788 | /* | |
789 | * Test for a VIRTUAL carrier transition to HIGH. | |
790 | */ | |
791 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
792 | ||
793 | /* | |
794 | * When carrier rises, wake any threads waiting | |
795 | * for carrier in the open routine. | |
796 | */ | |
797 | ||
798 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
799 | "carrier: virt DCD rose\n"); | |
800 | ||
801 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
802 | wake_up_interruptible(&ch->ch_flags_wait); | |
803 | } | |
804 | ||
805 | /* | |
806 | * Test for a PHYSICAL carrier transition to HIGH. | |
807 | */ | |
808 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
809 | ||
810 | /* | |
811 | * When carrier rises, wake any threads waiting | |
812 | * for carrier in the open routine. | |
813 | */ | |
814 | ||
815 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
816 | "carrier: physical DCD rose\n"); | |
817 | ||
818 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
819 | wake_up_interruptible(&ch->ch_flags_wait); | |
820 | } | |
821 | ||
822 | /* | |
823 | * Test for a PHYSICAL transition to low, so long as we aren't | |
824 | * currently ignoring physical transitions (which is what "virtual | |
825 | * carrier" indicates). | |
826 | * | |
827 | * The transition of the virtual carrier to low really doesn't | |
828 | * matter... it really only means "ignore carrier state", not | |
829 | * "make pretend that carrier is there". | |
830 | */ | |
831 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) | |
832 | && (phys_carrier == 0)) { | |
833 | /* | |
834 | * When carrier drops: | |
835 | * | |
836 | * Drop carrier on all open units. | |
837 | * | |
838 | * Flush queues, waking up any task waiting in the | |
839 | * line discipline. | |
840 | * | |
841 | * Send a hangup to the control terminal. | |
842 | * | |
843 | * Enable all select calls. | |
844 | */ | |
845 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
846 | wake_up_interruptible(&ch->ch_flags_wait); | |
847 | } | |
848 | ||
849 | /* | |
850 | * Make sure that our cached values reflect the current reality. | |
851 | */ | |
852 | if (virt_carrier == 1) | |
853 | ch->ch_flags |= CH_FCAR; | |
854 | else | |
855 | ch->ch_flags &= ~CH_FCAR; | |
856 | ||
857 | if (phys_carrier == 1) | |
858 | ch->ch_flags |= CH_CD; | |
859 | else | |
860 | ch->ch_flags &= ~CH_CD; | |
861 | } | |
862 | ||
863 | ||
864 | void jsm_check_queue_flow_control(struct jsm_channel *ch) | |
865 | { | |
866 | int qleft = 0; | |
867 | ||
868 | /* Store how much space we have left in the queue */ | |
869 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) | |
870 | qleft += RQUEUEMASK + 1; | |
871 | ||
872 | /* | |
873 | * Check to see if we should enforce flow control on our queue because | |
874 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
875 | * | |
876 | * NOTE: This is done based on what the current flow control of the | |
877 | * port is set for. | |
878 | * | |
879 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
880 | * This will cause the UART's FIFO to back up, and force | |
881 | * the RTS signal to be dropped. | |
882 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
883 | * the other side, in hopes it will stop sending data to us. | |
884 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
885 | * that gets sent into us when the queue fills up. | |
886 | */ | |
887 | if (qleft < 256) { | |
888 | /* HWFLOW */ | |
889 | if (ch->ch_c_cflag & CRTSCTS) { | |
890 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { | |
891 | ch->ch_bd->bd_ops->disable_receiver(ch); | |
892 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
893 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
894 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", | |
895 | qleft); | |
896 | } | |
897 | } | |
898 | /* SWFLOW */ | |
899 | else if (ch->ch_c_iflag & IXOFF) { | |
900 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
901 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
902 | ch->ch_stops_sent++; | |
903 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
904 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); | |
905 | } | |
906 | } | |
907 | } | |
908 | ||
909 | /* | |
910 | * Check to see if we should unenforce flow control because | |
911 | * ld (or user) finally read enuf data out of our queue. | |
912 | * | |
913 | * NOTE: This is done based on what the current flow control of the | |
914 | * port is set for. | |
915 | * | |
916 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
917 | * This will cause the UART's FIFO to raise RTS back up, | |
918 | * which will allow the other side to start sending data again. | |
919 | * 2) SWFLOW (IXOFF) - Send a start character to | |
920 | * the other side, so it will start sending data to us again. | |
921 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
922 | * other side, we don't need to do anything now. | |
923 | */ | |
924 | if (qleft > (RQUEUESIZE / 2)) { | |
925 | /* HWFLOW */ | |
926 | if (ch->ch_c_cflag & CRTSCTS) { | |
927 | if (ch->ch_flags & CH_RECEIVER_OFF) { | |
928 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
929 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
930 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
931 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", | |
932 | qleft); | |
933 | } | |
934 | } | |
935 | /* SWFLOW */ | |
936 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
937 | ch->ch_stops_sent = 0; | |
938 | ch->ch_bd->bd_ops->send_start_character(ch); | |
939 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); | |
940 | } | |
941 | } | |
942 | } | |
943 | ||
944 | /* | |
945 | * jsm_tty_write() | |
946 | * | |
947 | * Take data from the user or kernel and send it out to the FEP. | |
948 | * In here exists all the Transparent Print magic as well. | |
949 | */ | |
950 | int jsm_tty_write(struct uart_port *port) | |
951 | { | |
952 | int bufcount = 0, n = 0; | |
953 | int data_count = 0,data_count1 =0; | |
954 | u16 head; | |
955 | u16 tail; | |
956 | u16 tmask; | |
957 | u32 remain; | |
958 | int temp_tail = port->info->xmit.tail; | |
959 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
960 | ||
961 | tmask = WQUEUEMASK; | |
962 | head = (channel->ch_w_head) & tmask; | |
963 | tail = (channel->ch_w_tail) & tmask; | |
964 | ||
965 | if ((bufcount = tail - head - 1) < 0) | |
966 | bufcount += WQUEUESIZE; | |
967 | ||
968 | n = bufcount; | |
969 | ||
970 | n = min(n, 56); | |
971 | remain = WQUEUESIZE - head; | |
972 | ||
973 | data_count = 0; | |
974 | if (n >= remain) { | |
975 | n -= remain; | |
976 | while ((port->info->xmit.head != temp_tail) && | |
977 | (data_count < remain)) { | |
978 | channel->ch_wqueue[head++] = | |
979 | port->info->xmit.buf[temp_tail]; | |
980 | ||
981 | temp_tail++; | |
982 | temp_tail &= (UART_XMIT_SIZE - 1); | |
983 | data_count++; | |
984 | } | |
985 | if (data_count == remain) head = 0; | |
986 | } | |
987 | ||
988 | data_count1 = 0; | |
989 | if (n > 0) { | |
990 | remain = n; | |
991 | while ((port->info->xmit.head != temp_tail) && | |
992 | (data_count1 < remain)) { | |
993 | channel->ch_wqueue[head++] = | |
994 | port->info->xmit.buf[temp_tail]; | |
995 | ||
996 | temp_tail++; | |
997 | temp_tail &= (UART_XMIT_SIZE - 1); | |
998 | data_count1++; | |
999 | ||
1000 | } | |
1001 | } | |
1002 | ||
1003 | port->info->xmit.tail = temp_tail; | |
1004 | ||
1005 | data_count += data_count1; | |
1006 | if (data_count) { | |
1007 | head &= tmask; | |
1008 | channel->ch_w_head = head; | |
1009 | } | |
1010 | ||
1011 | if (data_count) { | |
1012 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); | |
1013 | } | |
1014 | ||
1015 | return data_count; | |
1016 | } |