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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 | ||
34 | static inline int jsm_get_mstat(struct jsm_channel *ch) | |
35 | { | |
36 | unsigned char mstat; | |
37 | unsigned result; | |
38 | ||
39 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
40 | ||
41 | mstat = (ch->ch_mostat | ch->ch_mistat); | |
42 | ||
43 | result = 0; | |
44 | ||
45 | if (mstat & UART_MCR_DTR) | |
46 | result |= TIOCM_DTR; | |
47 | if (mstat & UART_MCR_RTS) | |
48 | result |= TIOCM_RTS; | |
49 | if (mstat & UART_MSR_CTS) | |
50 | result |= TIOCM_CTS; | |
51 | if (mstat & UART_MSR_DSR) | |
52 | result |= TIOCM_DSR; | |
53 | if (mstat & UART_MSR_RI) | |
54 | result |= TIOCM_RI; | |
55 | if (mstat & UART_MSR_DCD) | |
56 | result |= TIOCM_CD; | |
57 | ||
58 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); | |
59 | return result; | |
60 | } | |
61 | ||
62 | static unsigned int jsm_tty_tx_empty(struct uart_port *port) | |
63 | { | |
64 | return TIOCSER_TEMT; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Return modem signals to ld. | |
69 | */ | |
70 | static unsigned int jsm_tty_get_mctrl(struct uart_port *port) | |
71 | { | |
72 | int result; | |
73 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
74 | ||
75 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
76 | ||
77 | result = jsm_get_mstat(channel); | |
78 | ||
79 | if (result < 0) | |
80 | return -ENXIO; | |
81 | ||
82 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
83 | ||
84 | return result; | |
85 | } | |
86 | ||
87 | /* | |
88 | * jsm_set_modem_info() | |
89 | * | |
90 | * Set modem signals, called by ld. | |
91 | */ | |
92 | static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
93 | { | |
94 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
95 | ||
96 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
97 | ||
98 | if (mctrl & TIOCM_RTS) | |
99 | channel->ch_mostat |= UART_MCR_RTS; | |
100 | else | |
101 | channel->ch_mostat &= ~UART_MCR_RTS; | |
102 | ||
103 | if (mctrl & TIOCM_DTR) | |
104 | channel->ch_mostat |= UART_MCR_DTR; | |
105 | else | |
106 | channel->ch_mostat &= ~UART_MCR_DTR; | |
107 | ||
108 | channel->ch_bd->bd_ops->assert_modem_signals(channel); | |
109 | ||
110 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
111 | udelay(10); | |
112 | } | |
113 | ||
114 | static void jsm_tty_start_tx(struct uart_port *port, unsigned int tty_start) | |
115 | { | |
116 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
117 | ||
118 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
119 | ||
120 | channel->ch_flags &= ~(CH_STOP); | |
121 | jsm_tty_write(port); | |
122 | ||
123 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
124 | } | |
125 | ||
126 | static void jsm_tty_stop_tx(struct uart_port *port, unsigned int tty_stop) | |
127 | { | |
128 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
129 | ||
130 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
131 | ||
132 | channel->ch_flags |= (CH_STOP); | |
133 | ||
134 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
135 | } | |
136 | ||
137 | static void jsm_tty_send_xchar(struct uart_port *port, char ch) | |
138 | { | |
139 | unsigned long lock_flags; | |
140 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
141 | ||
142 | spin_lock_irqsave(&port->lock, lock_flags); | |
143 | if (ch == port->info->tty->termios->c_cc[VSTART]) | |
144 | channel->ch_bd->bd_ops->send_start_character(channel); | |
145 | ||
146 | if (ch == port->info->tty->termios->c_cc[VSTOP]) | |
147 | channel->ch_bd->bd_ops->send_stop_character(channel); | |
148 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
149 | } | |
150 | ||
151 | static void jsm_tty_stop_rx(struct uart_port *port) | |
152 | { | |
153 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
154 | ||
155 | channel->ch_bd->bd_ops->disable_receiver(channel); | |
156 | } | |
157 | ||
158 | static void jsm_tty_break(struct uart_port *port, int break_state) | |
159 | { | |
160 | unsigned long lock_flags; | |
161 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
162 | ||
163 | spin_lock_irqsave(&port->lock, lock_flags); | |
164 | if (break_state == -1) | |
165 | channel->ch_bd->bd_ops->send_break(channel); | |
166 | else | |
167 | channel->ch_bd->bd_ops->clear_break(channel, 0); | |
168 | ||
169 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
170 | } | |
171 | ||
172 | static int jsm_tty_open(struct uart_port *port) | |
173 | { | |
174 | struct jsm_board *brd; | |
175 | int rc = 0; | |
176 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
177 | ||
178 | /* Get board pointer from our array of majors we have allocated */ | |
179 | brd = channel->ch_bd; | |
180 | ||
181 | /* | |
182 | * Allocate channel buffers for read/write/error. | |
183 | * Set flag, so we don't get trounced on. | |
184 | */ | |
185 | channel->ch_flags |= (CH_OPENING); | |
186 | ||
187 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
188 | ||
189 | if (!channel->ch_rqueue) { | |
190 | channel->ch_rqueue = (u8 *) kmalloc(RQUEUESIZE, GFP_KERNEL); | |
191 | if (!channel->ch_rqueue) { | |
192 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
193 | "unable to allocate read queue buf"); | |
194 | return -ENOMEM; | |
195 | } | |
196 | memset(channel->ch_rqueue, 0, RQUEUESIZE); | |
197 | } | |
198 | if (!channel->ch_equeue) { | |
199 | channel->ch_equeue = (u8 *) kmalloc(EQUEUESIZE, GFP_KERNEL); | |
200 | if (!channel->ch_equeue) { | |
201 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
202 | "unable to allocate error queue buf"); | |
203 | return -ENOMEM; | |
204 | } | |
205 | memset(channel->ch_equeue, 0, EQUEUESIZE); | |
206 | } | |
207 | if (!channel->ch_wqueue) { | |
208 | channel->ch_wqueue = (u8 *) kmalloc(WQUEUESIZE, GFP_KERNEL); | |
209 | if (!channel->ch_wqueue) { | |
210 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
211 | "unable to allocate write queue buf"); | |
212 | return -ENOMEM; | |
213 | } | |
214 | memset(channel->ch_wqueue, 0, WQUEUESIZE); | |
215 | } | |
216 | ||
217 | channel->ch_flags &= ~(CH_OPENING); | |
218 | /* | |
219 | * Initialize if neither terminal is open. | |
220 | */ | |
221 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, | |
222 | "jsm_open: initializing channel in open...\n"); | |
223 | ||
224 | /* | |
225 | * Flush input queues. | |
226 | */ | |
227 | channel->ch_r_head = channel->ch_r_tail = 0; | |
228 | channel->ch_e_head = channel->ch_e_tail = 0; | |
229 | channel->ch_w_head = channel->ch_w_tail = 0; | |
230 | ||
231 | brd->bd_ops->flush_uart_write(channel); | |
232 | brd->bd_ops->flush_uart_read(channel); | |
233 | ||
234 | channel->ch_flags = 0; | |
235 | channel->ch_cached_lsr = 0; | |
236 | channel->ch_stops_sent = 0; | |
237 | ||
238 | channel->ch_c_cflag = port->info->tty->termios->c_cflag; | |
239 | channel->ch_c_iflag = port->info->tty->termios->c_iflag; | |
240 | channel->ch_c_oflag = port->info->tty->termios->c_oflag; | |
241 | channel->ch_c_lflag = port->info->tty->termios->c_lflag; | |
242 | channel->ch_startc = port->info->tty->termios->c_cc[VSTART]; | |
243 | channel->ch_stopc = port->info->tty->termios->c_cc[VSTOP]; | |
244 | ||
245 | /* Tell UART to init itself */ | |
246 | brd->bd_ops->uart_init(channel); | |
247 | ||
248 | /* | |
249 | * Run param in case we changed anything | |
250 | */ | |
251 | brd->bd_ops->param(channel); | |
252 | ||
253 | jsm_carrier(channel); | |
254 | ||
255 | channel->ch_open_count++; | |
256 | ||
257 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
258 | return rc; | |
259 | } | |
260 | ||
261 | static void jsm_tty_close(struct uart_port *port) | |
262 | { | |
263 | struct jsm_board *bd; | |
264 | struct termios *ts; | |
265 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
266 | ||
267 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
268 | ||
269 | bd = channel->ch_bd; | |
270 | ts = channel->uart_port.info->tty->termios; | |
271 | ||
272 | channel->ch_flags &= ~(CH_STOPI); | |
273 | ||
274 | channel->ch_open_count--; | |
275 | ||
276 | /* | |
277 | * If we have HUPCL set, lower DTR and RTS | |
278 | */ | |
279 | if (channel->ch_c_cflag & HUPCL) { | |
280 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, | |
281 | "Close. HUPCL set, dropping DTR/RTS\n"); | |
282 | ||
283 | /* Drop RTS/DTR */ | |
284 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
285 | bd->bd_ops->assert_modem_signals(channel); | |
286 | } | |
287 | ||
288 | channel->ch_old_baud = 0; | |
289 | ||
290 | /* Turn off UART interrupts for this port */ | |
291 | channel->ch_bd->bd_ops->uart_off(channel); | |
292 | ||
293 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
294 | } | |
295 | ||
296 | static void jsm_tty_set_termios(struct uart_port *port, | |
297 | struct termios *termios, | |
298 | struct termios *old_termios) | |
299 | { | |
300 | unsigned long lock_flags; | |
301 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
302 | ||
303 | spin_lock_irqsave(&port->lock, lock_flags); | |
304 | channel->ch_c_cflag = termios->c_cflag; | |
305 | channel->ch_c_iflag = termios->c_iflag; | |
306 | channel->ch_c_oflag = termios->c_oflag; | |
307 | channel->ch_c_lflag = termios->c_lflag; | |
308 | channel->ch_startc = termios->c_cc[VSTART]; | |
309 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
310 | ||
311 | channel->ch_bd->bd_ops->param(channel); | |
312 | jsm_carrier(channel); | |
313 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
314 | } | |
315 | ||
316 | static const char *jsm_tty_type(struct uart_port *port) | |
317 | { | |
318 | return "jsm"; | |
319 | } | |
320 | ||
321 | static void jsm_tty_release_port(struct uart_port *port) | |
322 | { | |
323 | } | |
324 | ||
325 | static int jsm_tty_request_port(struct uart_port *port) | |
326 | { | |
327 | return 0; | |
328 | } | |
329 | ||
330 | static void jsm_config_port(struct uart_port *port, int flags) | |
331 | { | |
332 | port->type = PORT_JSM; | |
333 | } | |
334 | ||
335 | static struct uart_ops jsm_ops = { | |
336 | .tx_empty = jsm_tty_tx_empty, | |
337 | .set_mctrl = jsm_tty_set_mctrl, | |
338 | .get_mctrl = jsm_tty_get_mctrl, | |
339 | .stop_tx = jsm_tty_stop_tx, | |
340 | .start_tx = jsm_tty_start_tx, | |
341 | .send_xchar = jsm_tty_send_xchar, | |
342 | .stop_rx = jsm_tty_stop_rx, | |
343 | .break_ctl = jsm_tty_break, | |
344 | .startup = jsm_tty_open, | |
345 | .shutdown = jsm_tty_close, | |
346 | .set_termios = jsm_tty_set_termios, | |
347 | .type = jsm_tty_type, | |
348 | .release_port = jsm_tty_release_port, | |
349 | .request_port = jsm_tty_request_port, | |
350 | .config_port = jsm_config_port, | |
351 | }; | |
352 | ||
353 | /* | |
354 | * jsm_tty_init() | |
355 | * | |
356 | * Init the tty subsystem. Called once per board after board has been | |
357 | * downloaded and init'ed. | |
358 | */ | |
359 | int jsm_tty_init(struct jsm_board *brd) | |
360 | { | |
361 | int i; | |
362 | void __iomem *vaddr; | |
363 | struct jsm_channel *ch; | |
364 | ||
365 | if (!brd) | |
366 | return -ENXIO; | |
367 | ||
368 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
369 | ||
370 | /* | |
371 | * Initialize board structure elements. | |
372 | */ | |
373 | ||
374 | brd->nasync = brd->maxports; | |
375 | ||
376 | /* | |
377 | * Allocate channel memory that might not have been allocated | |
378 | * when the driver was first loaded. | |
379 | */ | |
380 | for (i = 0; i < brd->nasync; i++) { | |
381 | if (!brd->channels[i]) { | |
382 | ||
383 | /* | |
384 | * Okay to malloc with GFP_KERNEL, we are not at | |
385 | * interrupt context, and there are no locks held. | |
386 | */ | |
387 | brd->channels[i] = kmalloc(sizeof(struct jsm_channel), GFP_KERNEL); | |
388 | if (!brd->channels[i]) { | |
389 | jsm_printk(CORE, ERR, &brd->pci_dev, | |
390 | "%s:%d Unable to allocate memory for channel struct\n", | |
391 | __FILE__, __LINE__); | |
392 | } | |
393 | memset(brd->channels[i], 0, sizeof(struct jsm_channel)); | |
394 | } | |
395 | } | |
396 | ||
397 | ch = brd->channels[0]; | |
398 | vaddr = brd->re_map_membase; | |
399 | ||
400 | /* Set up channel variables */ | |
401 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
402 | ||
403 | if (!brd->channels[i]) | |
404 | continue; | |
405 | ||
406 | spin_lock_init(&ch->ch_lock); | |
407 | ||
408 | if (brd->bd_uart_offset == 0x200) | |
409 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); | |
410 | ||
411 | ch->ch_bd = brd; | |
412 | ch->ch_portnum = i; | |
413 | ||
414 | /* .25 second delay */ | |
415 | ch->ch_close_delay = 250; | |
416 | ||
417 | init_waitqueue_head(&ch->ch_flags_wait); | |
418 | } | |
419 | ||
420 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
421 | return 0; | |
422 | } | |
423 | ||
424 | int jsm_uart_port_init(struct jsm_board *brd) | |
425 | { | |
426 | int i; | |
427 | struct jsm_channel *ch; | |
428 | ||
429 | if (!brd) | |
430 | return -ENXIO; | |
431 | ||
432 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
433 | ||
434 | /* | |
435 | * Initialize board structure elements. | |
436 | */ | |
437 | ||
438 | brd->nasync = brd->maxports; | |
439 | ||
440 | /* Set up channel variables */ | |
441 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
442 | ||
443 | if (!brd->channels[i]) | |
444 | continue; | |
445 | ||
446 | brd->channels[i]->uart_port.irq = brd->irq; | |
447 | brd->channels[i]->uart_port.type = PORT_JSM; | |
448 | brd->channels[i]->uart_port.iotype = UPIO_MEM; | |
449 | brd->channels[i]->uart_port.membase = brd->re_map_membase; | |
450 | brd->channels[i]->uart_port.fifosize = 16; | |
451 | brd->channels[i]->uart_port.ops = &jsm_ops; | |
452 | brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2; | |
453 | if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port)) | |
454 | printk(KERN_INFO "Added device failed\n"); | |
455 | else | |
456 | printk(KERN_INFO "Added device \n"); | |
457 | } | |
458 | ||
459 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
460 | return 0; | |
461 | } | |
462 | ||
463 | int jsm_remove_uart_port(struct jsm_board *brd) | |
464 | { | |
465 | int i; | |
466 | struct jsm_channel *ch; | |
467 | ||
468 | if (!brd) | |
469 | return -ENXIO; | |
470 | ||
471 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
472 | ||
473 | /* | |
474 | * Initialize board structure elements. | |
475 | */ | |
476 | ||
477 | brd->nasync = brd->maxports; | |
478 | ||
479 | /* Set up channel variables */ | |
480 | for (i = 0; i < brd->nasync; i++) { | |
481 | ||
482 | if (!brd->channels[i]) | |
483 | continue; | |
484 | ||
485 | ch = brd->channels[i]; | |
486 | ||
487 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); | |
488 | } | |
489 | ||
490 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
491 | return 0; | |
492 | } | |
493 | ||
494 | void jsm_input(struct jsm_channel *ch) | |
495 | { | |
496 | struct jsm_board *bd; | |
497 | struct tty_struct *tp; | |
498 | u32 rmask; | |
499 | u16 head; | |
500 | u16 tail; | |
501 | int data_len; | |
502 | unsigned long lock_flags; | |
503 | int flip_len; | |
504 | int len = 0; | |
505 | int n = 0; | |
506 | char *buf = NULL; | |
507 | char *buf2 = NULL; | |
508 | int s = 0; | |
509 | int i = 0; | |
510 | ||
511 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
512 | ||
513 | if (!ch) | |
514 | return; | |
515 | ||
516 | tp = ch->uart_port.info->tty; | |
517 | ||
518 | bd = ch->ch_bd; | |
519 | if(!bd) | |
520 | return; | |
521 | ||
522 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
523 | ||
524 | /* | |
525 | *Figure the number of characters in the buffer. | |
526 | *Exit immediately if none. | |
527 | */ | |
528 | ||
529 | rmask = RQUEUEMASK; | |
530 | ||
531 | head = ch->ch_r_head & rmask; | |
532 | tail = ch->ch_r_tail & rmask; | |
533 | ||
534 | data_len = (head - tail) & rmask; | |
535 | if (data_len == 0) { | |
536 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
537 | return; | |
538 | } | |
539 | ||
540 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
541 | ||
542 | /* | |
543 | *If the device is not open, or CREAD is off, flush | |
544 | *input data and return immediately. | |
545 | */ | |
546 | if (!tp || | |
547 | !(tp->termios->c_cflag & CREAD) ) { | |
548 | ||
549 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
550 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); | |
551 | ch->ch_r_head = tail; | |
552 | ||
553 | /* Force queue flow control to be released, if needed */ | |
554 | jsm_check_queue_flow_control(ch); | |
555 | ||
556 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
557 | return; | |
558 | } | |
559 | ||
560 | /* | |
561 | * If we are throttled, simply don't read any data. | |
562 | */ | |
563 | if (ch->ch_flags & CH_STOPI) { | |
564 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
565 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
566 | "Port %d throttled, not reading any data. head: %x tail: %x\n", | |
567 | ch->ch_portnum, head, tail); | |
568 | return; | |
569 | } | |
570 | ||
571 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); | |
572 | ||
573 | /* | |
574 | * If the rxbuf is empty and we are not throttled, put as much | |
575 | * as we can directly into the linux TTY flip buffer. | |
576 | * The jsm_rawreadok case takes advantage of carnal knowledge that | |
577 | * the char_buf and the flag_buf are next to each other and | |
578 | * are each of (2 * TTY_FLIPBUF_SIZE) size. | |
579 | * | |
580 | * NOTE: if(!tty->real_raw), the call to ldisc.receive_buf | |
581 | *actually still uses the flag buffer, so you can't | |
582 | *use it for input data | |
583 | */ | |
584 | if (jsm_rawreadok) { | |
585 | if (tp->real_raw) | |
586 | flip_len = MYFLIPLEN; | |
587 | else | |
588 | flip_len = 2 * TTY_FLIPBUF_SIZE; | |
589 | } else | |
590 | flip_len = TTY_FLIPBUF_SIZE - tp->flip.count; | |
591 | ||
592 | len = min(data_len, flip_len); | |
593 | len = min(len, (N_TTY_BUF_SIZE - 1) - tp->read_cnt); | |
594 | ||
595 | if (len <= 0) { | |
596 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
597 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); | |
598 | return; | |
599 | } | |
600 | ||
601 | /* | |
602 | * If we're bypassing flip buffers on rx, we can blast it | |
603 | * right into the beginning of the buffer. | |
604 | */ | |
605 | if (jsm_rawreadok) { | |
606 | if (tp->real_raw) { | |
607 | if (ch->ch_flags & CH_FLIPBUF_IN_USE) { | |
608 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
609 | "JSM - FLIPBUF in use. delaying input\n"); | |
610 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
611 | return; | |
612 | } | |
613 | ch->ch_flags |= CH_FLIPBUF_IN_USE; | |
614 | buf = ch->ch_bd->flipbuf; | |
615 | buf2 = NULL; | |
616 | } else { | |
617 | buf = tp->flip.char_buf; | |
618 | buf2 = tp->flip.flag_buf; | |
619 | } | |
620 | } else { | |
621 | buf = tp->flip.char_buf_ptr; | |
622 | buf2 = tp->flip.flag_buf_ptr; | |
623 | } | |
624 | ||
625 | n = len; | |
626 | ||
627 | /* | |
628 | * n now contains the most amount of data we can copy, | |
629 | * bounded either by the flip buffer size or the amount | |
630 | * of data the card actually has pending... | |
631 | */ | |
632 | while (n) { | |
633 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
634 | s = min(s, n); | |
635 | ||
636 | if (s <= 0) | |
637 | break; | |
638 | ||
639 | memcpy(buf, ch->ch_rqueue + tail, s); | |
640 | ||
641 | /* buf2 is only set when port isn't raw */ | |
642 | if (buf2) | |
643 | memcpy(buf2, ch->ch_equeue + tail, s); | |
644 | ||
645 | tail += s; | |
646 | buf += s; | |
647 | if (buf2) | |
648 | buf2 += s; | |
649 | n -= s; | |
650 | /* Flip queue if needed */ | |
651 | tail &= rmask; | |
652 | } | |
653 | ||
654 | /* | |
655 | * In high performance mode, we don't have to update | |
656 | * flag_buf or any of the counts or pointers into flip buf. | |
657 | */ | |
658 | if (!jsm_rawreadok) { | |
659 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { | |
660 | for (i = 0; i < len; i++) { | |
661 | /* | |
662 | * Give the Linux ld the flags in the | |
663 | * format it likes. | |
664 | */ | |
665 | if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI) | |
666 | tp->flip.flag_buf_ptr[i] = TTY_BREAK; | |
667 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE) | |
668 | tp->flip.flag_buf_ptr[i] = TTY_PARITY; | |
669 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE) | |
670 | tp->flip.flag_buf_ptr[i] = TTY_FRAME; | |
671 | else | |
672 | tp->flip.flag_buf_ptr[i] = TTY_NORMAL; | |
673 | } | |
674 | } else { | |
675 | memset(tp->flip.flag_buf_ptr, 0, len); | |
676 | } | |
677 | ||
678 | tp->flip.char_buf_ptr += len; | |
679 | tp->flip.flag_buf_ptr += len; | |
680 | tp->flip.count += len; | |
681 | } | |
682 | else if (!tp->real_raw) { | |
683 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { | |
684 | for (i = 0; i < len; i++) { | |
685 | /* | |
686 | * Give the Linux ld the flags in the | |
687 | * format it likes. | |
688 | */ | |
689 | if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI) | |
690 | tp->flip.flag_buf_ptr[i] = TTY_BREAK; | |
691 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE) | |
692 | tp->flip.flag_buf_ptr[i] = TTY_PARITY; | |
693 | else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE) | |
694 | tp->flip.flag_buf_ptr[i] = TTY_FRAME; | |
695 | else | |
696 | tp->flip.flag_buf_ptr[i] = TTY_NORMAL; | |
697 | } | |
698 | } else | |
699 | memset(tp->flip.flag_buf, 0, len); | |
700 | } | |
701 | ||
702 | /* | |
703 | * If we're doing raw reads, jam it right into the | |
704 | * line disc bypassing the flip buffers. | |
705 | */ | |
706 | if (jsm_rawreadok) { | |
707 | if (tp->real_raw) { | |
708 | ch->ch_r_tail = tail & rmask; | |
709 | ch->ch_e_tail = tail & rmask; | |
710 | ||
711 | jsm_check_queue_flow_control(ch); | |
712 | ||
713 | /* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */ | |
714 | ||
715 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
716 | ||
717 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
718 | "jsm_input. %d real_raw len:%d calling receive_buf for board %d\n", | |
719 | __LINE__, len, ch->ch_bd->boardnum); | |
720 | tp->ldisc.receive_buf(tp, ch->ch_bd->flipbuf, NULL, len); | |
721 | ||
722 | /* Allow use of channel flip buffer again */ | |
723 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
724 | ch->ch_flags &= ~CH_FLIPBUF_IN_USE; | |
725 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
726 | ||
727 | } else { | |
728 | ch->ch_r_tail = tail & rmask; | |
729 | ch->ch_e_tail = tail & rmask; | |
730 | ||
731 | jsm_check_queue_flow_control(ch); | |
732 | ||
733 | /* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */ | |
734 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
735 | ||
736 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
737 | "jsm_input. %d not real_raw len:%d calling receive_buf for board %d\n", | |
738 | __LINE__, len, ch->ch_bd->boardnum); | |
739 | ||
740 | tp->ldisc.receive_buf(tp, tp->flip.char_buf, tp->flip.flag_buf, len); | |
741 | } | |
742 | } else { | |
743 | ch->ch_r_tail = tail & rmask; | |
744 | ch->ch_e_tail = tail & rmask; | |
745 | ||
746 | jsm_check_queue_flow_control(ch); | |
747 | ||
748 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
749 | ||
750 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
751 | "jsm_input. %d not jsm_read raw okay scheduling flip\n", __LINE__); | |
752 | tty_schedule_flip(tp); | |
753 | } | |
754 | ||
755 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); | |
756 | } | |
757 | ||
758 | void jsm_carrier(struct jsm_channel *ch) | |
759 | { | |
760 | struct jsm_board *bd; | |
761 | ||
762 | int virt_carrier = 0; | |
763 | int phys_carrier = 0; | |
764 | ||
765 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
766 | if (!ch) | |
767 | return; | |
768 | ||
769 | bd = ch->ch_bd; | |
770 | ||
771 | if (!bd) | |
772 | return; | |
773 | ||
774 | if (ch->ch_mistat & UART_MSR_DCD) { | |
775 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
776 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); | |
777 | phys_carrier = 1; | |
778 | } | |
779 | ||
780 | if (ch->ch_c_cflag & CLOCAL) | |
781 | virt_carrier = 1; | |
782 | ||
783 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
784 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); | |
785 | ||
786 | /* | |
787 | * Test for a VIRTUAL carrier transition to HIGH. | |
788 | */ | |
789 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
790 | ||
791 | /* | |
792 | * When carrier rises, wake any threads waiting | |
793 | * for carrier in the open routine. | |
794 | */ | |
795 | ||
796 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
797 | "carrier: virt DCD rose\n"); | |
798 | ||
799 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
800 | wake_up_interruptible(&ch->ch_flags_wait); | |
801 | } | |
802 | ||
803 | /* | |
804 | * Test for a PHYSICAL carrier transition to HIGH. | |
805 | */ | |
806 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
807 | ||
808 | /* | |
809 | * When carrier rises, wake any threads waiting | |
810 | * for carrier in the open routine. | |
811 | */ | |
812 | ||
813 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
814 | "carrier: physical DCD rose\n"); | |
815 | ||
816 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
817 | wake_up_interruptible(&ch->ch_flags_wait); | |
818 | } | |
819 | ||
820 | /* | |
821 | * Test for a PHYSICAL transition to low, so long as we aren't | |
822 | * currently ignoring physical transitions (which is what "virtual | |
823 | * carrier" indicates). | |
824 | * | |
825 | * The transition of the virtual carrier to low really doesn't | |
826 | * matter... it really only means "ignore carrier state", not | |
827 | * "make pretend that carrier is there". | |
828 | */ | |
829 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) | |
830 | && (phys_carrier == 0)) { | |
831 | /* | |
832 | * When carrier drops: | |
833 | * | |
834 | * Drop carrier on all open units. | |
835 | * | |
836 | * Flush queues, waking up any task waiting in the | |
837 | * line discipline. | |
838 | * | |
839 | * Send a hangup to the control terminal. | |
840 | * | |
841 | * Enable all select calls. | |
842 | */ | |
843 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
844 | wake_up_interruptible(&ch->ch_flags_wait); | |
845 | } | |
846 | ||
847 | /* | |
848 | * Make sure that our cached values reflect the current reality. | |
849 | */ | |
850 | if (virt_carrier == 1) | |
851 | ch->ch_flags |= CH_FCAR; | |
852 | else | |
853 | ch->ch_flags &= ~CH_FCAR; | |
854 | ||
855 | if (phys_carrier == 1) | |
856 | ch->ch_flags |= CH_CD; | |
857 | else | |
858 | ch->ch_flags &= ~CH_CD; | |
859 | } | |
860 | ||
861 | ||
862 | void jsm_check_queue_flow_control(struct jsm_channel *ch) | |
863 | { | |
864 | int qleft = 0; | |
865 | ||
866 | /* Store how much space we have left in the queue */ | |
867 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) | |
868 | qleft += RQUEUEMASK + 1; | |
869 | ||
870 | /* | |
871 | * Check to see if we should enforce flow control on our queue because | |
872 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
873 | * | |
874 | * NOTE: This is done based on what the current flow control of the | |
875 | * port is set for. | |
876 | * | |
877 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
878 | * This will cause the UART's FIFO to back up, and force | |
879 | * the RTS signal to be dropped. | |
880 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
881 | * the other side, in hopes it will stop sending data to us. | |
882 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
883 | * that gets sent into us when the queue fills up. | |
884 | */ | |
885 | if (qleft < 256) { | |
886 | /* HWFLOW */ | |
887 | if (ch->ch_c_cflag & CRTSCTS) { | |
888 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { | |
889 | ch->ch_bd->bd_ops->disable_receiver(ch); | |
890 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
891 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
892 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", | |
893 | qleft); | |
894 | } | |
895 | } | |
896 | /* SWFLOW */ | |
897 | else if (ch->ch_c_iflag & IXOFF) { | |
898 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
899 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
900 | ch->ch_stops_sent++; | |
901 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
902 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); | |
903 | } | |
904 | } | |
905 | } | |
906 | ||
907 | /* | |
908 | * Check to see if we should unenforce flow control because | |
909 | * ld (or user) finally read enuf data out of our queue. | |
910 | * | |
911 | * NOTE: This is done based on what the current flow control of the | |
912 | * port is set for. | |
913 | * | |
914 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
915 | * This will cause the UART's FIFO to raise RTS back up, | |
916 | * which will allow the other side to start sending data again. | |
917 | * 2) SWFLOW (IXOFF) - Send a start character to | |
918 | * the other side, so it will start sending data to us again. | |
919 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
920 | * other side, we don't need to do anything now. | |
921 | */ | |
922 | if (qleft > (RQUEUESIZE / 2)) { | |
923 | /* HWFLOW */ | |
924 | if (ch->ch_c_cflag & CRTSCTS) { | |
925 | if (ch->ch_flags & CH_RECEIVER_OFF) { | |
926 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
927 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
928 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
929 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", | |
930 | qleft); | |
931 | } | |
932 | } | |
933 | /* SWFLOW */ | |
934 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
935 | ch->ch_stops_sent = 0; | |
936 | ch->ch_bd->bd_ops->send_start_character(ch); | |
937 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); | |
938 | } | |
939 | } | |
940 | } | |
941 | ||
942 | /* | |
943 | * jsm_tty_write() | |
944 | * | |
945 | * Take data from the user or kernel and send it out to the FEP. | |
946 | * In here exists all the Transparent Print magic as well. | |
947 | */ | |
948 | int jsm_tty_write(struct uart_port *port) | |
949 | { | |
950 | int bufcount = 0, n = 0; | |
951 | int data_count = 0,data_count1 =0; | |
952 | u16 head; | |
953 | u16 tail; | |
954 | u16 tmask; | |
955 | u32 remain; | |
956 | int temp_tail = port->info->xmit.tail; | |
957 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
958 | ||
959 | tmask = WQUEUEMASK; | |
960 | head = (channel->ch_w_head) & tmask; | |
961 | tail = (channel->ch_w_tail) & tmask; | |
962 | ||
963 | if ((bufcount = tail - head - 1) < 0) | |
964 | bufcount += WQUEUESIZE; | |
965 | ||
966 | n = bufcount; | |
967 | ||
968 | n = min(n, 56); | |
969 | remain = WQUEUESIZE - head; | |
970 | ||
971 | data_count = 0; | |
972 | if (n >= remain) { | |
973 | n -= remain; | |
974 | while ((port->info->xmit.head != temp_tail) && | |
975 | (data_count < remain)) { | |
976 | channel->ch_wqueue[head++] = | |
977 | port->info->xmit.buf[temp_tail]; | |
978 | ||
979 | temp_tail++; | |
980 | temp_tail &= (UART_XMIT_SIZE - 1); | |
981 | data_count++; | |
982 | } | |
983 | if (data_count == remain) head = 0; | |
984 | } | |
985 | ||
986 | data_count1 = 0; | |
987 | if (n > 0) { | |
988 | remain = n; | |
989 | while ((port->info->xmit.head != temp_tail) && | |
990 | (data_count1 < remain)) { | |
991 | channel->ch_wqueue[head++] = | |
992 | port->info->xmit.buf[temp_tail]; | |
993 | ||
994 | temp_tail++; | |
995 | temp_tail &= (UART_XMIT_SIZE - 1); | |
996 | data_count1++; | |
997 | ||
998 | } | |
999 | } | |
1000 | ||
1001 | port->info->xmit.tail = temp_tail; | |
1002 | ||
1003 | data_count += data_count1; | |
1004 | if (data_count) { | |
1005 | head &= tmask; | |
1006 | channel->ch_w_head = head; | |
1007 | } | |
1008 | ||
1009 | if (data_count) { | |
1010 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); | |
1011 | } | |
1012 | ||
1013 | return data_count; | |
1014 | } | |
1015 | ||
1016 | static ssize_t jsm_driver_version_show(struct device_driver *ddp, char *buf) | |
1017 | { | |
1018 | return snprintf(buf, PAGE_SIZE, "%s\n", JSM_VERSION); | |
1019 | } | |
1020 | static DRIVER_ATTR(version, S_IRUSR, jsm_driver_version_show, NULL); | |
1021 | ||
1022 | static ssize_t jsm_driver_state_show(struct device_driver *ddp, char *buf) | |
1023 | { | |
1024 | return snprintf(buf, PAGE_SIZE, "%s\n", jsm_driver_state_text[jsm_driver_state]); | |
1025 | } | |
1026 | static DRIVER_ATTR(state, S_IRUSR, jsm_driver_state_show, NULL); | |
1027 | ||
1028 | void jsm_create_driver_sysfiles(struct device_driver *driverfs) | |
1029 | { | |
1030 | driver_create_file(driverfs, &driver_attr_version); | |
1031 | driver_create_file(driverfs, &driver_attr_state); | |
1032 | } | |
1033 | ||
1034 | void jsm_remove_driver_sysfiles(struct device_driver *driverfs) | |
1035 | { | |
1036 | driver_remove_file(driverfs, &driver_attr_version); | |
1037 | driver_remove_file(driverfs, &driver_attr_state); | |
1038 | } |