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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); | |
df4f4dd4 | 148 | termios = port->info->port.tty->termios; |
a58e00e7 | 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 | ||
0461ec5b PL |
164 | static void jsm_tty_enable_ms(struct uart_port *port) |
165 | { | |
166 | /* Nothing needed */ | |
167 | } | |
168 | ||
1da177e4 LT |
169 | static void jsm_tty_break(struct uart_port *port, int break_state) |
170 | { | |
171 | unsigned long lock_flags; | |
172 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
173 | ||
174 | spin_lock_irqsave(&port->lock, lock_flags); | |
175 | if (break_state == -1) | |
176 | channel->ch_bd->bd_ops->send_break(channel); | |
177 | else | |
178 | channel->ch_bd->bd_ops->clear_break(channel, 0); | |
179 | ||
180 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
181 | } | |
182 | ||
183 | static int jsm_tty_open(struct uart_port *port) | |
184 | { | |
185 | struct jsm_board *brd; | |
186 | int rc = 0; | |
187 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
606d099c | 188 | struct ktermios *termios; |
1da177e4 LT |
189 | |
190 | /* Get board pointer from our array of majors we have allocated */ | |
191 | brd = channel->ch_bd; | |
192 | ||
193 | /* | |
194 | * Allocate channel buffers for read/write/error. | |
195 | * Set flag, so we don't get trounced on. | |
196 | */ | |
197 | channel->ch_flags |= (CH_OPENING); | |
198 | ||
199 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
200 | ||
201 | if (!channel->ch_rqueue) { | |
8f31bb39 | 202 | channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
203 | if (!channel->ch_rqueue) { |
204 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
205 | "unable to allocate read queue buf"); | |
206 | return -ENOMEM; | |
207 | } | |
1da177e4 LT |
208 | } |
209 | if (!channel->ch_equeue) { | |
8f31bb39 | 210 | channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
211 | if (!channel->ch_equeue) { |
212 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
213 | "unable to allocate error queue buf"); | |
214 | return -ENOMEM; | |
215 | } | |
1da177e4 LT |
216 | } |
217 | if (!channel->ch_wqueue) { | |
8f31bb39 | 218 | channel->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
219 | if (!channel->ch_wqueue) { |
220 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
221 | "unable to allocate write queue buf"); | |
222 | return -ENOMEM; | |
223 | } | |
1da177e4 LT |
224 | } |
225 | ||
226 | channel->ch_flags &= ~(CH_OPENING); | |
227 | /* | |
228 | * Initialize if neither terminal is open. | |
229 | */ | |
230 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, | |
231 | "jsm_open: initializing channel in open...\n"); | |
232 | ||
233 | /* | |
234 | * Flush input queues. | |
235 | */ | |
236 | channel->ch_r_head = channel->ch_r_tail = 0; | |
237 | channel->ch_e_head = channel->ch_e_tail = 0; | |
238 | channel->ch_w_head = channel->ch_w_tail = 0; | |
239 | ||
240 | brd->bd_ops->flush_uart_write(channel); | |
241 | brd->bd_ops->flush_uart_read(channel); | |
242 | ||
243 | channel->ch_flags = 0; | |
244 | channel->ch_cached_lsr = 0; | |
245 | channel->ch_stops_sent = 0; | |
246 | ||
df4f4dd4 | 247 | termios = port->info->port.tty->termios; |
a58e00e7 JJ |
248 | channel->ch_c_cflag = termios->c_cflag; |
249 | channel->ch_c_iflag = termios->c_iflag; | |
250 | channel->ch_c_oflag = termios->c_oflag; | |
251 | channel->ch_c_lflag = termios->c_lflag; | |
252 | channel->ch_startc = termios->c_cc[VSTART]; | |
253 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
1da177e4 LT |
254 | |
255 | /* Tell UART to init itself */ | |
256 | brd->bd_ops->uart_init(channel); | |
257 | ||
258 | /* | |
259 | * Run param in case we changed anything | |
260 | */ | |
261 | brd->bd_ops->param(channel); | |
262 | ||
263 | jsm_carrier(channel); | |
264 | ||
265 | channel->ch_open_count++; | |
266 | ||
267 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
268 | return rc; | |
269 | } | |
270 | ||
271 | static void jsm_tty_close(struct uart_port *port) | |
272 | { | |
273 | struct jsm_board *bd; | |
606d099c | 274 | struct ktermios *ts; |
1da177e4 LT |
275 | struct jsm_channel *channel = (struct jsm_channel *)port; |
276 | ||
277 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
278 | ||
279 | bd = channel->ch_bd; | |
f751928e | 280 | ts = port->info->port.tty->termios; |
1da177e4 LT |
281 | |
282 | channel->ch_flags &= ~(CH_STOPI); | |
283 | ||
284 | channel->ch_open_count--; | |
285 | ||
286 | /* | |
287 | * If we have HUPCL set, lower DTR and RTS | |
288 | */ | |
289 | if (channel->ch_c_cflag & HUPCL) { | |
290 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, | |
291 | "Close. HUPCL set, dropping DTR/RTS\n"); | |
292 | ||
293 | /* Drop RTS/DTR */ | |
294 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
295 | bd->bd_ops->assert_modem_signals(channel); | |
296 | } | |
297 | ||
298 | channel->ch_old_baud = 0; | |
299 | ||
300 | /* Turn off UART interrupts for this port */ | |
301 | channel->ch_bd->bd_ops->uart_off(channel); | |
302 | ||
303 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
304 | } | |
305 | ||
306 | static void jsm_tty_set_termios(struct uart_port *port, | |
606d099c AC |
307 | struct ktermios *termios, |
308 | struct ktermios *old_termios) | |
1da177e4 LT |
309 | { |
310 | unsigned long lock_flags; | |
311 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
312 | ||
313 | spin_lock_irqsave(&port->lock, lock_flags); | |
314 | channel->ch_c_cflag = termios->c_cflag; | |
315 | channel->ch_c_iflag = termios->c_iflag; | |
316 | channel->ch_c_oflag = termios->c_oflag; | |
317 | channel->ch_c_lflag = termios->c_lflag; | |
318 | channel->ch_startc = termios->c_cc[VSTART]; | |
319 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
320 | ||
321 | channel->ch_bd->bd_ops->param(channel); | |
322 | jsm_carrier(channel); | |
323 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
324 | } | |
325 | ||
326 | static const char *jsm_tty_type(struct uart_port *port) | |
327 | { | |
328 | return "jsm"; | |
329 | } | |
330 | ||
331 | static void jsm_tty_release_port(struct uart_port *port) | |
332 | { | |
333 | } | |
334 | ||
335 | static int jsm_tty_request_port(struct uart_port *port) | |
336 | { | |
337 | return 0; | |
338 | } | |
339 | ||
340 | static void jsm_config_port(struct uart_port *port, int flags) | |
341 | { | |
342 | port->type = PORT_JSM; | |
343 | } | |
344 | ||
345 | static struct uart_ops jsm_ops = { | |
346 | .tx_empty = jsm_tty_tx_empty, | |
347 | .set_mctrl = jsm_tty_set_mctrl, | |
348 | .get_mctrl = jsm_tty_get_mctrl, | |
349 | .stop_tx = jsm_tty_stop_tx, | |
350 | .start_tx = jsm_tty_start_tx, | |
351 | .send_xchar = jsm_tty_send_xchar, | |
352 | .stop_rx = jsm_tty_stop_rx, | |
0461ec5b | 353 | .enable_ms = jsm_tty_enable_ms, |
1da177e4 LT |
354 | .break_ctl = jsm_tty_break, |
355 | .startup = jsm_tty_open, | |
356 | .shutdown = jsm_tty_close, | |
357 | .set_termios = jsm_tty_set_termios, | |
358 | .type = jsm_tty_type, | |
359 | .release_port = jsm_tty_release_port, | |
360 | .request_port = jsm_tty_request_port, | |
361 | .config_port = jsm_config_port, | |
362 | }; | |
363 | ||
364 | /* | |
365 | * jsm_tty_init() | |
366 | * | |
367 | * Init the tty subsystem. Called once per board after board has been | |
368 | * downloaded and init'ed. | |
369 | */ | |
aacf17ad | 370 | int __devinit jsm_tty_init(struct jsm_board *brd) |
1da177e4 LT |
371 | { |
372 | int i; | |
373 | void __iomem *vaddr; | |
374 | struct jsm_channel *ch; | |
375 | ||
376 | if (!brd) | |
377 | return -ENXIO; | |
378 | ||
379 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
380 | ||
381 | /* | |
382 | * Initialize board structure elements. | |
383 | */ | |
384 | ||
385 | brd->nasync = brd->maxports; | |
386 | ||
387 | /* | |
388 | * Allocate channel memory that might not have been allocated | |
389 | * when the driver was first loaded. | |
390 | */ | |
391 | for (i = 0; i < brd->nasync; i++) { | |
392 | if (!brd->channels[i]) { | |
393 | ||
394 | /* | |
395 | * Okay to malloc with GFP_KERNEL, we are not at | |
396 | * interrupt context, and there are no locks held. | |
397 | */ | |
8f31bb39 | 398 | brd->channels[i] = kzalloc(sizeof(struct jsm_channel), GFP_KERNEL); |
1da177e4 LT |
399 | if (!brd->channels[i]) { |
400 | jsm_printk(CORE, ERR, &brd->pci_dev, | |
401 | "%s:%d Unable to allocate memory for channel struct\n", | |
402 | __FILE__, __LINE__); | |
403 | } | |
1da177e4 LT |
404 | } |
405 | } | |
406 | ||
407 | ch = brd->channels[0]; | |
408 | vaddr = brd->re_map_membase; | |
409 | ||
410 | /* Set up channel variables */ | |
411 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
412 | ||
413 | if (!brd->channels[i]) | |
414 | continue; | |
415 | ||
416 | spin_lock_init(&ch->ch_lock); | |
417 | ||
418 | if (brd->bd_uart_offset == 0x200) | |
419 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); | |
420 | ||
421 | ch->ch_bd = brd; | |
422 | ch->ch_portnum = i; | |
423 | ||
424 | /* .25 second delay */ | |
425 | ch->ch_close_delay = 250; | |
426 | ||
427 | init_waitqueue_head(&ch->ch_flags_wait); | |
428 | } | |
429 | ||
430 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
431 | return 0; | |
432 | } | |
433 | ||
aacf17ad | 434 | int __devinit jsm_uart_port_init(struct jsm_board *brd) |
1da177e4 LT |
435 | { |
436 | int i; | |
437 | struct jsm_channel *ch; | |
438 | ||
439 | if (!brd) | |
440 | return -ENXIO; | |
441 | ||
442 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
443 | ||
444 | /* | |
445 | * Initialize board structure elements. | |
446 | */ | |
447 | ||
448 | brd->nasync = brd->maxports; | |
449 | ||
450 | /* Set up channel variables */ | |
451 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
452 | ||
453 | if (!brd->channels[i]) | |
454 | continue; | |
455 | ||
456 | brd->channels[i]->uart_port.irq = brd->irq; | |
3c04c272 | 457 | brd->channels[i]->uart_port.uartclk = 14745600; |
1da177e4 LT |
458 | brd->channels[i]->uart_port.type = PORT_JSM; |
459 | brd->channels[i]->uart_port.iotype = UPIO_MEM; | |
460 | brd->channels[i]->uart_port.membase = brd->re_map_membase; | |
461 | brd->channels[i]->uart_port.fifosize = 16; | |
462 | brd->channels[i]->uart_port.ops = &jsm_ops; | |
463 | brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2; | |
464 | if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port)) | |
465 | printk(KERN_INFO "Added device failed\n"); | |
466 | else | |
467 | printk(KERN_INFO "Added device \n"); | |
468 | } | |
469 | ||
470 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | int jsm_remove_uart_port(struct jsm_board *brd) | |
475 | { | |
476 | int i; | |
477 | struct jsm_channel *ch; | |
478 | ||
479 | if (!brd) | |
480 | return -ENXIO; | |
481 | ||
482 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
483 | ||
484 | /* | |
485 | * Initialize board structure elements. | |
486 | */ | |
487 | ||
488 | brd->nasync = brd->maxports; | |
489 | ||
490 | /* Set up channel variables */ | |
491 | for (i = 0; i < brd->nasync; i++) { | |
492 | ||
493 | if (!brd->channels[i]) | |
494 | continue; | |
495 | ||
496 | ch = brd->channels[i]; | |
497 | ||
498 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); | |
499 | } | |
500 | ||
501 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
502 | return 0; | |
503 | } | |
504 | ||
505 | void jsm_input(struct jsm_channel *ch) | |
506 | { | |
507 | struct jsm_board *bd; | |
508 | struct tty_struct *tp; | |
509 | u32 rmask; | |
510 | u16 head; | |
511 | u16 tail; | |
512 | int data_len; | |
513 | unsigned long lock_flags; | |
1da177e4 LT |
514 | int len = 0; |
515 | int n = 0; | |
1da177e4 LT |
516 | int s = 0; |
517 | int i = 0; | |
518 | ||
519 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
520 | ||
521 | if (!ch) | |
522 | return; | |
523 | ||
df4f4dd4 | 524 | tp = ch->uart_port.info->port.tty; |
1da177e4 LT |
525 | |
526 | bd = ch->ch_bd; | |
527 | if(!bd) | |
528 | return; | |
529 | ||
530 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
531 | ||
532 | /* | |
533 | *Figure the number of characters in the buffer. | |
534 | *Exit immediately if none. | |
535 | */ | |
536 | ||
537 | rmask = RQUEUEMASK; | |
538 | ||
539 | head = ch->ch_r_head & rmask; | |
540 | tail = ch->ch_r_tail & rmask; | |
541 | ||
542 | data_len = (head - tail) & rmask; | |
543 | if (data_len == 0) { | |
544 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
545 | return; | |
546 | } | |
547 | ||
548 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
549 | ||
550 | /* | |
551 | *If the device is not open, or CREAD is off, flush | |
552 | *input data and return immediately. | |
553 | */ | |
554 | if (!tp || | |
555 | !(tp->termios->c_cflag & CREAD) ) { | |
556 | ||
557 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
558 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); | |
559 | ch->ch_r_head = tail; | |
560 | ||
561 | /* Force queue flow control to be released, if needed */ | |
562 | jsm_check_queue_flow_control(ch); | |
563 | ||
564 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
565 | return; | |
566 | } | |
567 | ||
568 | /* | |
569 | * If we are throttled, simply don't read any data. | |
570 | */ | |
571 | if (ch->ch_flags & CH_STOPI) { | |
572 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
573 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
574 | "Port %d throttled, not reading any data. head: %x tail: %x\n", | |
575 | ch->ch_portnum, head, tail); | |
576 | return; | |
577 | } | |
578 | ||
579 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); | |
580 | ||
7ba4b927 | 581 | if (data_len <= 0) { |
0a577ce3 AK |
582 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
583 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); | |
0a577ce3 | 584 | return; |
1da177e4 LT |
585 | } |
586 | ||
7ba4b927 | 587 | len = tty_buffer_request_room(tp, data_len); |
1da177e4 LT |
588 | n = len; |
589 | ||
590 | /* | |
591 | * n now contains the most amount of data we can copy, | |
592 | * bounded either by the flip buffer size or the amount | |
593 | * of data the card actually has pending... | |
594 | */ | |
595 | while (n) { | |
596 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
597 | s = min(s, n); | |
598 | ||
599 | if (s <= 0) | |
600 | break; | |
601 | ||
0a577ce3 AK |
602 | /* |
603 | * If conditions are such that ld needs to see all | |
604 | * UART errors, we will have to walk each character | |
605 | * and error byte and send them to the buffer one at | |
606 | * a time. | |
607 | */ | |
1da177e4 | 608 | |
1da177e4 | 609 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
0a577ce3 | 610 | for (i = 0; i < s; i++) { |
1da177e4 LT |
611 | /* |
612 | * Give the Linux ld the flags in the | |
613 | * format it likes. | |
614 | */ | |
0a577ce3 AK |
615 | if (*(ch->ch_equeue +tail +i) & UART_LSR_BI) |
616 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_BREAK); | |
617 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE) | |
618 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY); | |
619 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE) | |
620 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME); | |
1da177e4 | 621 | else |
7ba4b927 | 622 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL); |
1da177e4 LT |
623 | } |
624 | } else { | |
0a577ce3 | 625 | tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ; |
1da177e4 | 626 | } |
0a577ce3 AK |
627 | tail += s; |
628 | n -= s; | |
629 | /* Flip queue if needed */ | |
630 | tail &= rmask; | |
1da177e4 LT |
631 | } |
632 | ||
0a577ce3 AK |
633 | ch->ch_r_tail = tail & rmask; |
634 | ch->ch_e_tail = tail & rmask; | |
635 | jsm_check_queue_flow_control(ch); | |
636 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
1da177e4 | 637 | |
0a577ce3 AK |
638 | /* Tell the tty layer its okay to "eat" the data now */ |
639 | tty_flip_buffer_push(tp); | |
1da177e4 | 640 | |
1da177e4 LT |
641 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); |
642 | } | |
643 | ||
408b664a | 644 | static void jsm_carrier(struct jsm_channel *ch) |
1da177e4 LT |
645 | { |
646 | struct jsm_board *bd; | |
647 | ||
648 | int virt_carrier = 0; | |
649 | int phys_carrier = 0; | |
650 | ||
651 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
652 | if (!ch) | |
653 | return; | |
654 | ||
655 | bd = ch->ch_bd; | |
656 | ||
657 | if (!bd) | |
658 | return; | |
659 | ||
660 | if (ch->ch_mistat & UART_MSR_DCD) { | |
661 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
662 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); | |
663 | phys_carrier = 1; | |
664 | } | |
665 | ||
666 | if (ch->ch_c_cflag & CLOCAL) | |
667 | virt_carrier = 1; | |
668 | ||
669 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
670 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); | |
671 | ||
672 | /* | |
673 | * Test for a VIRTUAL carrier transition to HIGH. | |
674 | */ | |
675 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
676 | ||
677 | /* | |
678 | * When carrier rises, wake any threads waiting | |
679 | * for carrier in the open routine. | |
680 | */ | |
681 | ||
682 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
683 | "carrier: virt DCD rose\n"); | |
684 | ||
685 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
686 | wake_up_interruptible(&ch->ch_flags_wait); | |
687 | } | |
688 | ||
689 | /* | |
690 | * Test for a PHYSICAL carrier transition to HIGH. | |
691 | */ | |
692 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
693 | ||
694 | /* | |
695 | * When carrier rises, wake any threads waiting | |
696 | * for carrier in the open routine. | |
697 | */ | |
698 | ||
699 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
700 | "carrier: physical DCD rose\n"); | |
701 | ||
702 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
703 | wake_up_interruptible(&ch->ch_flags_wait); | |
704 | } | |
705 | ||
706 | /* | |
707 | * Test for a PHYSICAL transition to low, so long as we aren't | |
708 | * currently ignoring physical transitions (which is what "virtual | |
709 | * carrier" indicates). | |
710 | * | |
711 | * The transition of the virtual carrier to low really doesn't | |
712 | * matter... it really only means "ignore carrier state", not | |
713 | * "make pretend that carrier is there". | |
714 | */ | |
715 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) | |
716 | && (phys_carrier == 0)) { | |
717 | /* | |
718 | * When carrier drops: | |
719 | * | |
720 | * Drop carrier on all open units. | |
721 | * | |
722 | * Flush queues, waking up any task waiting in the | |
723 | * line discipline. | |
724 | * | |
725 | * Send a hangup to the control terminal. | |
726 | * | |
727 | * Enable all select calls. | |
728 | */ | |
729 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
730 | wake_up_interruptible(&ch->ch_flags_wait); | |
731 | } | |
732 | ||
733 | /* | |
734 | * Make sure that our cached values reflect the current reality. | |
735 | */ | |
736 | if (virt_carrier == 1) | |
737 | ch->ch_flags |= CH_FCAR; | |
738 | else | |
739 | ch->ch_flags &= ~CH_FCAR; | |
740 | ||
741 | if (phys_carrier == 1) | |
742 | ch->ch_flags |= CH_CD; | |
743 | else | |
744 | ch->ch_flags &= ~CH_CD; | |
745 | } | |
746 | ||
747 | ||
748 | void jsm_check_queue_flow_control(struct jsm_channel *ch) | |
749 | { | |
a58e00e7 | 750 | struct board_ops *bd_ops = ch->ch_bd->bd_ops; |
1da177e4 LT |
751 | int qleft = 0; |
752 | ||
753 | /* Store how much space we have left in the queue */ | |
754 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) | |
755 | qleft += RQUEUEMASK + 1; | |
756 | ||
757 | /* | |
758 | * Check to see if we should enforce flow control on our queue because | |
759 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
760 | * | |
761 | * NOTE: This is done based on what the current flow control of the | |
762 | * port is set for. | |
763 | * | |
764 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
765 | * This will cause the UART's FIFO to back up, and force | |
766 | * the RTS signal to be dropped. | |
767 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
768 | * the other side, in hopes it will stop sending data to us. | |
769 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
770 | * that gets sent into us when the queue fills up. | |
771 | */ | |
772 | if (qleft < 256) { | |
773 | /* HWFLOW */ | |
774 | if (ch->ch_c_cflag & CRTSCTS) { | |
775 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { | |
a58e00e7 | 776 | bd_ops->disable_receiver(ch); |
1da177e4 LT |
777 | ch->ch_flags |= (CH_RECEIVER_OFF); |
778 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
779 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", | |
780 | qleft); | |
781 | } | |
782 | } | |
783 | /* SWFLOW */ | |
784 | else if (ch->ch_c_iflag & IXOFF) { | |
785 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
a58e00e7 | 786 | bd_ops->send_stop_character(ch); |
1da177e4 LT |
787 | ch->ch_stops_sent++; |
788 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
789 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); | |
790 | } | |
791 | } | |
792 | } | |
793 | ||
794 | /* | |
795 | * Check to see if we should unenforce flow control because | |
796 | * ld (or user) finally read enuf data out of our queue. | |
797 | * | |
798 | * NOTE: This is done based on what the current flow control of the | |
799 | * port is set for. | |
800 | * | |
801 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
802 | * This will cause the UART's FIFO to raise RTS back up, | |
803 | * which will allow the other side to start sending data again. | |
804 | * 2) SWFLOW (IXOFF) - Send a start character to | |
805 | * the other side, so it will start sending data to us again. | |
806 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
807 | * other side, we don't need to do anything now. | |
808 | */ | |
809 | if (qleft > (RQUEUESIZE / 2)) { | |
810 | /* HWFLOW */ | |
811 | if (ch->ch_c_cflag & CRTSCTS) { | |
812 | if (ch->ch_flags & CH_RECEIVER_OFF) { | |
a58e00e7 | 813 | bd_ops->enable_receiver(ch); |
1da177e4 LT |
814 | ch->ch_flags &= ~(CH_RECEIVER_OFF); |
815 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
816 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", | |
817 | qleft); | |
818 | } | |
819 | } | |
820 | /* SWFLOW */ | |
821 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
822 | ch->ch_stops_sent = 0; | |
a58e00e7 | 823 | bd_ops->send_start_character(ch); |
1da177e4 LT |
824 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); |
825 | } | |
826 | } | |
827 | } | |
828 | ||
829 | /* | |
830 | * jsm_tty_write() | |
831 | * | |
832 | * Take data from the user or kernel and send it out to the FEP. | |
833 | * In here exists all the Transparent Print magic as well. | |
834 | */ | |
835 | int jsm_tty_write(struct uart_port *port) | |
836 | { | |
837 | int bufcount = 0, n = 0; | |
838 | int data_count = 0,data_count1 =0; | |
839 | u16 head; | |
840 | u16 tail; | |
841 | u16 tmask; | |
842 | u32 remain; | |
843 | int temp_tail = port->info->xmit.tail; | |
844 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
845 | ||
846 | tmask = WQUEUEMASK; | |
847 | head = (channel->ch_w_head) & tmask; | |
848 | tail = (channel->ch_w_tail) & tmask; | |
849 | ||
850 | if ((bufcount = tail - head - 1) < 0) | |
851 | bufcount += WQUEUESIZE; | |
852 | ||
853 | n = bufcount; | |
854 | ||
855 | n = min(n, 56); | |
856 | remain = WQUEUESIZE - head; | |
857 | ||
858 | data_count = 0; | |
859 | if (n >= remain) { | |
860 | n -= remain; | |
861 | while ((port->info->xmit.head != temp_tail) && | |
862 | (data_count < remain)) { | |
863 | channel->ch_wqueue[head++] = | |
864 | port->info->xmit.buf[temp_tail]; | |
865 | ||
866 | temp_tail++; | |
867 | temp_tail &= (UART_XMIT_SIZE - 1); | |
868 | data_count++; | |
869 | } | |
870 | if (data_count == remain) head = 0; | |
871 | } | |
872 | ||
873 | data_count1 = 0; | |
874 | if (n > 0) { | |
875 | remain = n; | |
876 | while ((port->info->xmit.head != temp_tail) && | |
877 | (data_count1 < remain)) { | |
878 | channel->ch_wqueue[head++] = | |
879 | port->info->xmit.buf[temp_tail]; | |
880 | ||
881 | temp_tail++; | |
882 | temp_tail &= (UART_XMIT_SIZE - 1); | |
883 | data_count1++; | |
884 | ||
885 | } | |
886 | } | |
887 | ||
888 | port->info->xmit.tail = temp_tail; | |
889 | ||
890 | data_count += data_count1; | |
891 | if (data_count) { | |
892 | head &= tmask; | |
893 | channel->ch_w_head = head; | |
894 | } | |
895 | ||
896 | if (data_count) { | |
897 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); | |
898 | } | |
899 | ||
900 | return data_count; | |
901 | } |