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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; | |
1da177e4 | 186 | struct jsm_channel *channel = (struct jsm_channel *)port; |
606d099c | 187 | struct ktermios *termios; |
1da177e4 LT |
188 | |
189 | /* Get board pointer from our array of majors we have allocated */ | |
190 | brd = channel->ch_bd; | |
191 | ||
192 | /* | |
193 | * Allocate channel buffers for read/write/error. | |
194 | * Set flag, so we don't get trounced on. | |
195 | */ | |
196 | channel->ch_flags |= (CH_OPENING); | |
197 | ||
198 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
199 | ||
200 | if (!channel->ch_rqueue) { | |
8f31bb39 | 201 | channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
202 | if (!channel->ch_rqueue) { |
203 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
204 | "unable to allocate read queue buf"); | |
205 | return -ENOMEM; | |
206 | } | |
1da177e4 LT |
207 | } |
208 | if (!channel->ch_equeue) { | |
8f31bb39 | 209 | channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
210 | if (!channel->ch_equeue) { |
211 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
212 | "unable to allocate error queue buf"); | |
213 | return -ENOMEM; | |
214 | } | |
1da177e4 LT |
215 | } |
216 | if (!channel->ch_wqueue) { | |
8f31bb39 | 217 | channel->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
218 | if (!channel->ch_wqueue) { |
219 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
220 | "unable to allocate write queue buf"); | |
221 | return -ENOMEM; | |
222 | } | |
1da177e4 LT |
223 | } |
224 | ||
225 | channel->ch_flags &= ~(CH_OPENING); | |
226 | /* | |
227 | * Initialize if neither terminal is open. | |
228 | */ | |
229 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, | |
230 | "jsm_open: initializing channel in open...\n"); | |
231 | ||
232 | /* | |
233 | * Flush input queues. | |
234 | */ | |
235 | channel->ch_r_head = channel->ch_r_tail = 0; | |
236 | channel->ch_e_head = channel->ch_e_tail = 0; | |
237 | channel->ch_w_head = channel->ch_w_tail = 0; | |
238 | ||
239 | brd->bd_ops->flush_uart_write(channel); | |
240 | brd->bd_ops->flush_uart_read(channel); | |
241 | ||
242 | channel->ch_flags = 0; | |
243 | channel->ch_cached_lsr = 0; | |
244 | channel->ch_stops_sent = 0; | |
245 | ||
df4f4dd4 | 246 | termios = port->info->port.tty->termios; |
a58e00e7 JJ |
247 | channel->ch_c_cflag = termios->c_cflag; |
248 | channel->ch_c_iflag = termios->c_iflag; | |
249 | channel->ch_c_oflag = termios->c_oflag; | |
250 | channel->ch_c_lflag = termios->c_lflag; | |
251 | channel->ch_startc = termios->c_cc[VSTART]; | |
252 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
1da177e4 LT |
253 | |
254 | /* Tell UART to init itself */ | |
255 | brd->bd_ops->uart_init(channel); | |
256 | ||
257 | /* | |
258 | * Run param in case we changed anything | |
259 | */ | |
260 | brd->bd_ops->param(channel); | |
261 | ||
262 | jsm_carrier(channel); | |
263 | ||
264 | channel->ch_open_count++; | |
265 | ||
266 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
8e7d91c9 | 267 | return 0; |
1da177e4 LT |
268 | } |
269 | ||
270 | static void jsm_tty_close(struct uart_port *port) | |
271 | { | |
272 | struct jsm_board *bd; | |
606d099c | 273 | struct ktermios *ts; |
1da177e4 LT |
274 | struct jsm_channel *channel = (struct jsm_channel *)port; |
275 | ||
276 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
277 | ||
278 | bd = channel->ch_bd; | |
f751928e | 279 | ts = port->info->port.tty->termios; |
1da177e4 LT |
280 | |
281 | channel->ch_flags &= ~(CH_STOPI); | |
282 | ||
283 | channel->ch_open_count--; | |
284 | ||
285 | /* | |
286 | * If we have HUPCL set, lower DTR and RTS | |
287 | */ | |
288 | if (channel->ch_c_cflag & HUPCL) { | |
289 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, | |
290 | "Close. HUPCL set, dropping DTR/RTS\n"); | |
291 | ||
292 | /* Drop RTS/DTR */ | |
293 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
294 | bd->bd_ops->assert_modem_signals(channel); | |
295 | } | |
296 | ||
297 | channel->ch_old_baud = 0; | |
298 | ||
299 | /* Turn off UART interrupts for this port */ | |
300 | channel->ch_bd->bd_ops->uart_off(channel); | |
301 | ||
302 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
303 | } | |
304 | ||
305 | static void jsm_tty_set_termios(struct uart_port *port, | |
606d099c AC |
306 | struct ktermios *termios, |
307 | struct ktermios *old_termios) | |
1da177e4 LT |
308 | { |
309 | unsigned long lock_flags; | |
310 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
311 | ||
312 | spin_lock_irqsave(&port->lock, lock_flags); | |
313 | channel->ch_c_cflag = termios->c_cflag; | |
314 | channel->ch_c_iflag = termios->c_iflag; | |
315 | channel->ch_c_oflag = termios->c_oflag; | |
316 | channel->ch_c_lflag = termios->c_lflag; | |
317 | channel->ch_startc = termios->c_cc[VSTART]; | |
318 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
319 | ||
320 | channel->ch_bd->bd_ops->param(channel); | |
321 | jsm_carrier(channel); | |
322 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
323 | } | |
324 | ||
325 | static const char *jsm_tty_type(struct uart_port *port) | |
326 | { | |
327 | return "jsm"; | |
328 | } | |
329 | ||
330 | static void jsm_tty_release_port(struct uart_port *port) | |
331 | { | |
332 | } | |
333 | ||
334 | static int jsm_tty_request_port(struct uart_port *port) | |
335 | { | |
336 | return 0; | |
337 | } | |
338 | ||
339 | static void jsm_config_port(struct uart_port *port, int flags) | |
340 | { | |
341 | port->type = PORT_JSM; | |
342 | } | |
343 | ||
344 | static struct uart_ops jsm_ops = { | |
345 | .tx_empty = jsm_tty_tx_empty, | |
346 | .set_mctrl = jsm_tty_set_mctrl, | |
347 | .get_mctrl = jsm_tty_get_mctrl, | |
348 | .stop_tx = jsm_tty_stop_tx, | |
349 | .start_tx = jsm_tty_start_tx, | |
350 | .send_xchar = jsm_tty_send_xchar, | |
351 | .stop_rx = jsm_tty_stop_rx, | |
0461ec5b | 352 | .enable_ms = jsm_tty_enable_ms, |
1da177e4 LT |
353 | .break_ctl = jsm_tty_break, |
354 | .startup = jsm_tty_open, | |
355 | .shutdown = jsm_tty_close, | |
356 | .set_termios = jsm_tty_set_termios, | |
357 | .type = jsm_tty_type, | |
358 | .release_port = jsm_tty_release_port, | |
359 | .request_port = jsm_tty_request_port, | |
360 | .config_port = jsm_config_port, | |
361 | }; | |
362 | ||
363 | /* | |
364 | * jsm_tty_init() | |
365 | * | |
366 | * Init the tty subsystem. Called once per board after board has been | |
367 | * downloaded and init'ed. | |
368 | */ | |
aacf17ad | 369 | int __devinit jsm_tty_init(struct jsm_board *brd) |
1da177e4 LT |
370 | { |
371 | int i; | |
372 | void __iomem *vaddr; | |
373 | struct jsm_channel *ch; | |
374 | ||
375 | if (!brd) | |
376 | return -ENXIO; | |
377 | ||
378 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
379 | ||
380 | /* | |
381 | * Initialize board structure elements. | |
382 | */ | |
383 | ||
384 | brd->nasync = brd->maxports; | |
385 | ||
386 | /* | |
387 | * Allocate channel memory that might not have been allocated | |
388 | * when the driver was first loaded. | |
389 | */ | |
390 | for (i = 0; i < brd->nasync; i++) { | |
391 | if (!brd->channels[i]) { | |
392 | ||
393 | /* | |
394 | * Okay to malloc with GFP_KERNEL, we are not at | |
395 | * interrupt context, and there are no locks held. | |
396 | */ | |
8f31bb39 | 397 | brd->channels[i] = kzalloc(sizeof(struct jsm_channel), GFP_KERNEL); |
1da177e4 LT |
398 | if (!brd->channels[i]) { |
399 | jsm_printk(CORE, ERR, &brd->pci_dev, | |
400 | "%s:%d Unable to allocate memory for channel struct\n", | |
401 | __FILE__, __LINE__); | |
402 | } | |
1da177e4 LT |
403 | } |
404 | } | |
405 | ||
406 | ch = brd->channels[0]; | |
407 | vaddr = brd->re_map_membase; | |
408 | ||
409 | /* Set up channel variables */ | |
410 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
411 | ||
412 | if (!brd->channels[i]) | |
413 | continue; | |
414 | ||
415 | spin_lock_init(&ch->ch_lock); | |
416 | ||
417 | if (brd->bd_uart_offset == 0x200) | |
418 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); | |
419 | ||
420 | ch->ch_bd = brd; | |
421 | ch->ch_portnum = i; | |
422 | ||
423 | /* .25 second delay */ | |
424 | ch->ch_close_delay = 250; | |
425 | ||
426 | init_waitqueue_head(&ch->ch_flags_wait); | |
427 | } | |
428 | ||
429 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
430 | return 0; | |
431 | } | |
432 | ||
aacf17ad | 433 | int __devinit jsm_uart_port_init(struct jsm_board *brd) |
1da177e4 LT |
434 | { |
435 | int i; | |
436 | struct jsm_channel *ch; | |
437 | ||
438 | if (!brd) | |
439 | return -ENXIO; | |
440 | ||
441 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
442 | ||
443 | /* | |
444 | * Initialize board structure elements. | |
445 | */ | |
446 | ||
447 | brd->nasync = brd->maxports; | |
448 | ||
449 | /* Set up channel variables */ | |
450 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
451 | ||
452 | if (!brd->channels[i]) | |
453 | continue; | |
454 | ||
455 | brd->channels[i]->uart_port.irq = brd->irq; | |
3c04c272 | 456 | brd->channels[i]->uart_port.uartclk = 14745600; |
1da177e4 LT |
457 | brd->channels[i]->uart_port.type = PORT_JSM; |
458 | brd->channels[i]->uart_port.iotype = UPIO_MEM; | |
459 | brd->channels[i]->uart_port.membase = brd->re_map_membase; | |
460 | brd->channels[i]->uart_port.fifosize = 16; | |
461 | brd->channels[i]->uart_port.ops = &jsm_ops; | |
462 | brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2; | |
463 | if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port)) | |
464 | printk(KERN_INFO "Added device failed\n"); | |
465 | else | |
466 | printk(KERN_INFO "Added device \n"); | |
467 | } | |
468 | ||
469 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | int jsm_remove_uart_port(struct jsm_board *brd) | |
474 | { | |
475 | int i; | |
476 | struct jsm_channel *ch; | |
477 | ||
478 | if (!brd) | |
479 | return -ENXIO; | |
480 | ||
481 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
482 | ||
483 | /* | |
484 | * Initialize board structure elements. | |
485 | */ | |
486 | ||
487 | brd->nasync = brd->maxports; | |
488 | ||
489 | /* Set up channel variables */ | |
490 | for (i = 0; i < brd->nasync; i++) { | |
491 | ||
492 | if (!brd->channels[i]) | |
493 | continue; | |
494 | ||
495 | ch = brd->channels[i]; | |
496 | ||
497 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); | |
498 | } | |
499 | ||
500 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
501 | return 0; | |
502 | } | |
503 | ||
504 | void jsm_input(struct jsm_channel *ch) | |
505 | { | |
506 | struct jsm_board *bd; | |
507 | struct tty_struct *tp; | |
508 | u32 rmask; | |
509 | u16 head; | |
510 | u16 tail; | |
511 | int data_len; | |
512 | unsigned long lock_flags; | |
1da177e4 LT |
513 | int len = 0; |
514 | int n = 0; | |
1da177e4 LT |
515 | int s = 0; |
516 | int i = 0; | |
517 | ||
518 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
519 | ||
520 | if (!ch) | |
521 | return; | |
522 | ||
df4f4dd4 | 523 | tp = ch->uart_port.info->port.tty; |
1da177e4 LT |
524 | |
525 | bd = ch->ch_bd; | |
526 | if(!bd) | |
527 | return; | |
528 | ||
529 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
530 | ||
531 | /* | |
532 | *Figure the number of characters in the buffer. | |
533 | *Exit immediately if none. | |
534 | */ | |
535 | ||
536 | rmask = RQUEUEMASK; | |
537 | ||
538 | head = ch->ch_r_head & rmask; | |
539 | tail = ch->ch_r_tail & rmask; | |
540 | ||
541 | data_len = (head - tail) & rmask; | |
542 | if (data_len == 0) { | |
543 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
544 | return; | |
545 | } | |
546 | ||
547 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
548 | ||
549 | /* | |
550 | *If the device is not open, or CREAD is off, flush | |
551 | *input data and return immediately. | |
552 | */ | |
553 | if (!tp || | |
554 | !(tp->termios->c_cflag & CREAD) ) { | |
555 | ||
556 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
557 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); | |
558 | ch->ch_r_head = tail; | |
559 | ||
560 | /* Force queue flow control to be released, if needed */ | |
561 | jsm_check_queue_flow_control(ch); | |
562 | ||
563 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
564 | return; | |
565 | } | |
566 | ||
567 | /* | |
568 | * If we are throttled, simply don't read any data. | |
569 | */ | |
570 | if (ch->ch_flags & CH_STOPI) { | |
571 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
572 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
573 | "Port %d throttled, not reading any data. head: %x tail: %x\n", | |
574 | ch->ch_portnum, head, tail); | |
575 | return; | |
576 | } | |
577 | ||
578 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); | |
579 | ||
7ba4b927 | 580 | if (data_len <= 0) { |
0a577ce3 AK |
581 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
582 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); | |
0a577ce3 | 583 | return; |
1da177e4 LT |
584 | } |
585 | ||
7ba4b927 | 586 | len = tty_buffer_request_room(tp, data_len); |
1da177e4 LT |
587 | n = len; |
588 | ||
589 | /* | |
590 | * n now contains the most amount of data we can copy, | |
591 | * bounded either by the flip buffer size or the amount | |
592 | * of data the card actually has pending... | |
593 | */ | |
594 | while (n) { | |
595 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
596 | s = min(s, n); | |
597 | ||
598 | if (s <= 0) | |
599 | break; | |
600 | ||
0a577ce3 AK |
601 | /* |
602 | * If conditions are such that ld needs to see all | |
603 | * UART errors, we will have to walk each character | |
604 | * and error byte and send them to the buffer one at | |
605 | * a time. | |
606 | */ | |
1da177e4 | 607 | |
1da177e4 | 608 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
0a577ce3 | 609 | for (i = 0; i < s; i++) { |
1da177e4 LT |
610 | /* |
611 | * Give the Linux ld the flags in the | |
612 | * format it likes. | |
613 | */ | |
0a577ce3 AK |
614 | if (*(ch->ch_equeue +tail +i) & UART_LSR_BI) |
615 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_BREAK); | |
616 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE) | |
617 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY); | |
618 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE) | |
619 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME); | |
1da177e4 | 620 | else |
7ba4b927 | 621 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL); |
1da177e4 LT |
622 | } |
623 | } else { | |
0a577ce3 | 624 | tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ; |
1da177e4 | 625 | } |
0a577ce3 AK |
626 | tail += s; |
627 | n -= s; | |
628 | /* Flip queue if needed */ | |
629 | tail &= rmask; | |
1da177e4 LT |
630 | } |
631 | ||
0a577ce3 AK |
632 | ch->ch_r_tail = tail & rmask; |
633 | ch->ch_e_tail = tail & rmask; | |
634 | jsm_check_queue_flow_control(ch); | |
635 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
1da177e4 | 636 | |
0a577ce3 AK |
637 | /* Tell the tty layer its okay to "eat" the data now */ |
638 | tty_flip_buffer_push(tp); | |
1da177e4 | 639 | |
1da177e4 LT |
640 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); |
641 | } | |
642 | ||
408b664a | 643 | static void jsm_carrier(struct jsm_channel *ch) |
1da177e4 LT |
644 | { |
645 | struct jsm_board *bd; | |
646 | ||
647 | int virt_carrier = 0; | |
648 | int phys_carrier = 0; | |
649 | ||
650 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
651 | if (!ch) | |
652 | return; | |
653 | ||
654 | bd = ch->ch_bd; | |
655 | ||
656 | if (!bd) | |
657 | return; | |
658 | ||
659 | if (ch->ch_mistat & UART_MSR_DCD) { | |
660 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
661 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); | |
662 | phys_carrier = 1; | |
663 | } | |
664 | ||
665 | if (ch->ch_c_cflag & CLOCAL) | |
666 | virt_carrier = 1; | |
667 | ||
668 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
669 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); | |
670 | ||
671 | /* | |
672 | * Test for a VIRTUAL carrier transition to HIGH. | |
673 | */ | |
674 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
675 | ||
676 | /* | |
677 | * When carrier rises, wake any threads waiting | |
678 | * for carrier in the open routine. | |
679 | */ | |
680 | ||
681 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
682 | "carrier: virt DCD rose\n"); | |
683 | ||
684 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
685 | wake_up_interruptible(&ch->ch_flags_wait); | |
686 | } | |
687 | ||
688 | /* | |
689 | * Test for a PHYSICAL carrier transition to HIGH. | |
690 | */ | |
691 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
692 | ||
693 | /* | |
694 | * When carrier rises, wake any threads waiting | |
695 | * for carrier in the open routine. | |
696 | */ | |
697 | ||
698 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
699 | "carrier: physical DCD rose\n"); | |
700 | ||
701 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
702 | wake_up_interruptible(&ch->ch_flags_wait); | |
703 | } | |
704 | ||
705 | /* | |
706 | * Test for a PHYSICAL transition to low, so long as we aren't | |
707 | * currently ignoring physical transitions (which is what "virtual | |
708 | * carrier" indicates). | |
709 | * | |
710 | * The transition of the virtual carrier to low really doesn't | |
711 | * matter... it really only means "ignore carrier state", not | |
712 | * "make pretend that carrier is there". | |
713 | */ | |
714 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) | |
715 | && (phys_carrier == 0)) { | |
716 | /* | |
717 | * When carrier drops: | |
718 | * | |
719 | * Drop carrier on all open units. | |
720 | * | |
721 | * Flush queues, waking up any task waiting in the | |
722 | * line discipline. | |
723 | * | |
724 | * Send a hangup to the control terminal. | |
725 | * | |
726 | * Enable all select calls. | |
727 | */ | |
728 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
729 | wake_up_interruptible(&ch->ch_flags_wait); | |
730 | } | |
731 | ||
732 | /* | |
733 | * Make sure that our cached values reflect the current reality. | |
734 | */ | |
735 | if (virt_carrier == 1) | |
736 | ch->ch_flags |= CH_FCAR; | |
737 | else | |
738 | ch->ch_flags &= ~CH_FCAR; | |
739 | ||
740 | if (phys_carrier == 1) | |
741 | ch->ch_flags |= CH_CD; | |
742 | else | |
743 | ch->ch_flags &= ~CH_CD; | |
744 | } | |
745 | ||
746 | ||
747 | void jsm_check_queue_flow_control(struct jsm_channel *ch) | |
748 | { | |
a58e00e7 | 749 | struct board_ops *bd_ops = ch->ch_bd->bd_ops; |
8e7d91c9 | 750 | int qleft; |
1da177e4 LT |
751 | |
752 | /* Store how much space we have left in the queue */ | |
753 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) | |
754 | qleft += RQUEUEMASK + 1; | |
755 | ||
756 | /* | |
757 | * Check to see if we should enforce flow control on our queue because | |
758 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
759 | * | |
760 | * NOTE: This is done based on what the current flow control of the | |
761 | * port is set for. | |
762 | * | |
763 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
764 | * This will cause the UART's FIFO to back up, and force | |
765 | * the RTS signal to be dropped. | |
766 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
767 | * the other side, in hopes it will stop sending data to us. | |
768 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
769 | * that gets sent into us when the queue fills up. | |
770 | */ | |
771 | if (qleft < 256) { | |
772 | /* HWFLOW */ | |
773 | if (ch->ch_c_cflag & CRTSCTS) { | |
774 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { | |
a58e00e7 | 775 | bd_ops->disable_receiver(ch); |
1da177e4 LT |
776 | ch->ch_flags |= (CH_RECEIVER_OFF); |
777 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
778 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", | |
779 | qleft); | |
780 | } | |
781 | } | |
782 | /* SWFLOW */ | |
783 | else if (ch->ch_c_iflag & IXOFF) { | |
784 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
a58e00e7 | 785 | bd_ops->send_stop_character(ch); |
1da177e4 LT |
786 | ch->ch_stops_sent++; |
787 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
788 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); | |
789 | } | |
790 | } | |
791 | } | |
792 | ||
793 | /* | |
794 | * Check to see if we should unenforce flow control because | |
795 | * ld (or user) finally read enuf data out of our queue. | |
796 | * | |
797 | * NOTE: This is done based on what the current flow control of the | |
798 | * port is set for. | |
799 | * | |
800 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
801 | * This will cause the UART's FIFO to raise RTS back up, | |
802 | * which will allow the other side to start sending data again. | |
803 | * 2) SWFLOW (IXOFF) - Send a start character to | |
804 | * the other side, so it will start sending data to us again. | |
805 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
806 | * other side, we don't need to do anything now. | |
807 | */ | |
808 | if (qleft > (RQUEUESIZE / 2)) { | |
809 | /* HWFLOW */ | |
810 | if (ch->ch_c_cflag & CRTSCTS) { | |
811 | if (ch->ch_flags & CH_RECEIVER_OFF) { | |
a58e00e7 | 812 | bd_ops->enable_receiver(ch); |
1da177e4 LT |
813 | ch->ch_flags &= ~(CH_RECEIVER_OFF); |
814 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
815 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", | |
816 | qleft); | |
817 | } | |
818 | } | |
819 | /* SWFLOW */ | |
820 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
821 | ch->ch_stops_sent = 0; | |
a58e00e7 | 822 | bd_ops->send_start_character(ch); |
1da177e4 LT |
823 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); |
824 | } | |
825 | } | |
826 | } | |
827 | ||
828 | /* | |
829 | * jsm_tty_write() | |
830 | * | |
831 | * Take data from the user or kernel and send it out to the FEP. | |
832 | * In here exists all the Transparent Print magic as well. | |
833 | */ | |
834 | int jsm_tty_write(struct uart_port *port) | |
835 | { | |
8e7d91c9 | 836 | int bufcount; |
1da177e4 LT |
837 | int data_count = 0,data_count1 =0; |
838 | u16 head; | |
839 | u16 tail; | |
840 | u16 tmask; | |
841 | u32 remain; | |
842 | int temp_tail = port->info->xmit.tail; | |
843 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
844 | ||
845 | tmask = WQUEUEMASK; | |
846 | head = (channel->ch_w_head) & tmask; | |
847 | tail = (channel->ch_w_tail) & tmask; | |
848 | ||
849 | if ((bufcount = tail - head - 1) < 0) | |
850 | bufcount += WQUEUESIZE; | |
851 | ||
8e7d91c9 | 852 | bufcount = min(bufcount, 56); |
1da177e4 LT |
853 | remain = WQUEUESIZE - head; |
854 | ||
855 | data_count = 0; | |
8e7d91c9 BL |
856 | if (bufcount >= remain) { |
857 | bufcount -= remain; | |
1da177e4 LT |
858 | while ((port->info->xmit.head != temp_tail) && |
859 | (data_count < remain)) { | |
860 | channel->ch_wqueue[head++] = | |
861 | port->info->xmit.buf[temp_tail]; | |
862 | ||
863 | temp_tail++; | |
864 | temp_tail &= (UART_XMIT_SIZE - 1); | |
865 | data_count++; | |
866 | } | |
867 | if (data_count == remain) head = 0; | |
868 | } | |
869 | ||
870 | data_count1 = 0; | |
8e7d91c9 BL |
871 | if (bufcount > 0) { |
872 | remain = bufcount; | |
1da177e4 LT |
873 | while ((port->info->xmit.head != temp_tail) && |
874 | (data_count1 < remain)) { | |
875 | channel->ch_wqueue[head++] = | |
876 | port->info->xmit.buf[temp_tail]; | |
877 | ||
878 | temp_tail++; | |
879 | temp_tail &= (UART_XMIT_SIZE - 1); | |
880 | data_count1++; | |
881 | ||
882 | } | |
883 | } | |
884 | ||
885 | port->info->xmit.tail = temp_tail; | |
886 | ||
887 | data_count += data_count1; | |
888 | if (data_count) { | |
889 | head &= tmask; | |
890 | channel->ch_w_head = head; | |
891 | } | |
892 | ||
893 | if (data_count) { | |
894 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); | |
895 | } | |
896 | ||
897 | return data_count; | |
898 | } |