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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> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 LT |
34 | |
35 | #include "jsm.h" | |
36 | ||
13858d36 AF |
37 | static DECLARE_BITMAP(linemap, MAXLINES); |
38 | ||
408b664a AB |
39 | static void jsm_carrier(struct jsm_channel *ch); |
40 | ||
1da177e4 LT |
41 | static inline int jsm_get_mstat(struct jsm_channel *ch) |
42 | { | |
43 | unsigned char mstat; | |
44 | unsigned result; | |
45 | ||
46 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
47 | ||
48 | mstat = (ch->ch_mostat | ch->ch_mistat); | |
49 | ||
50 | result = 0; | |
51 | ||
52 | if (mstat & UART_MCR_DTR) | |
53 | result |= TIOCM_DTR; | |
54 | if (mstat & UART_MCR_RTS) | |
55 | result |= TIOCM_RTS; | |
56 | if (mstat & UART_MSR_CTS) | |
57 | result |= TIOCM_CTS; | |
58 | if (mstat & UART_MSR_DSR) | |
59 | result |= TIOCM_DSR; | |
60 | if (mstat & UART_MSR_RI) | |
61 | result |= TIOCM_RI; | |
62 | if (mstat & UART_MSR_DCD) | |
63 | result |= TIOCM_CD; | |
64 | ||
65 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); | |
66 | return result; | |
67 | } | |
68 | ||
69 | static unsigned int jsm_tty_tx_empty(struct uart_port *port) | |
70 | { | |
71 | return TIOCSER_TEMT; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Return modem signals to ld. | |
76 | */ | |
77 | static unsigned int jsm_tty_get_mctrl(struct uart_port *port) | |
78 | { | |
79 | int result; | |
80 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
81 | ||
82 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
83 | ||
84 | result = jsm_get_mstat(channel); | |
85 | ||
86 | if (result < 0) | |
87 | return -ENXIO; | |
88 | ||
89 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
90 | ||
91 | return result; | |
92 | } | |
93 | ||
94 | /* | |
95 | * jsm_set_modem_info() | |
96 | * | |
97 | * Set modem signals, called by ld. | |
98 | */ | |
99 | static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
100 | { | |
101 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
102 | ||
103 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
104 | ||
105 | if (mctrl & TIOCM_RTS) | |
106 | channel->ch_mostat |= UART_MCR_RTS; | |
107 | else | |
108 | channel->ch_mostat &= ~UART_MCR_RTS; | |
109 | ||
110 | if (mctrl & TIOCM_DTR) | |
111 | channel->ch_mostat |= UART_MCR_DTR; | |
112 | else | |
113 | channel->ch_mostat &= ~UART_MCR_DTR; | |
114 | ||
115 | channel->ch_bd->bd_ops->assert_modem_signals(channel); | |
116 | ||
117 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
118 | udelay(10); | |
119 | } | |
120 | ||
9d898966 TLSC |
121 | /* |
122 | * jsm_tty_write() | |
123 | * | |
124 | * Take data from the user or kernel and send it out to the FEP. | |
125 | * In here exists all the Transparent Print magic as well. | |
126 | */ | |
127 | static void jsm_tty_write(struct uart_port *port) | |
128 | { | |
129 | struct jsm_channel *channel; | |
130 | channel = container_of(port, struct jsm_channel, uart_port); | |
131 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); | |
132 | } | |
133 | ||
b129a8cc | 134 | static void jsm_tty_start_tx(struct uart_port *port) |
1da177e4 LT |
135 | { |
136 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
137 | ||
138 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
139 | ||
140 | channel->ch_flags &= ~(CH_STOP); | |
141 | jsm_tty_write(port); | |
142 | ||
143 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
144 | } | |
145 | ||
b129a8cc | 146 | static void jsm_tty_stop_tx(struct uart_port *port) |
1da177e4 LT |
147 | { |
148 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
149 | ||
150 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
151 | ||
152 | channel->ch_flags |= (CH_STOP); | |
153 | ||
154 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
155 | } | |
156 | ||
157 | static void jsm_tty_send_xchar(struct uart_port *port, char ch) | |
158 | { | |
159 | unsigned long lock_flags; | |
160 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
606d099c | 161 | struct ktermios *termios; |
1da177e4 LT |
162 | |
163 | spin_lock_irqsave(&port->lock, lock_flags); | |
ebd2c8f6 | 164 | termios = port->state->port.tty->termios; |
a58e00e7 | 165 | if (ch == termios->c_cc[VSTART]) |
1da177e4 LT |
166 | channel->ch_bd->bd_ops->send_start_character(channel); |
167 | ||
a58e00e7 | 168 | if (ch == termios->c_cc[VSTOP]) |
1da177e4 LT |
169 | channel->ch_bd->bd_ops->send_stop_character(channel); |
170 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
171 | } | |
172 | ||
173 | static void jsm_tty_stop_rx(struct uart_port *port) | |
174 | { | |
175 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
176 | ||
177 | channel->ch_bd->bd_ops->disable_receiver(channel); | |
178 | } | |
179 | ||
0461ec5b PL |
180 | static void jsm_tty_enable_ms(struct uart_port *port) |
181 | { | |
182 | /* Nothing needed */ | |
183 | } | |
184 | ||
1da177e4 LT |
185 | static void jsm_tty_break(struct uart_port *port, int break_state) |
186 | { | |
187 | unsigned long lock_flags; | |
188 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
189 | ||
190 | spin_lock_irqsave(&port->lock, lock_flags); | |
191 | if (break_state == -1) | |
192 | channel->ch_bd->bd_ops->send_break(channel); | |
193 | else | |
194 | channel->ch_bd->bd_ops->clear_break(channel, 0); | |
195 | ||
196 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
197 | } | |
198 | ||
199 | static int jsm_tty_open(struct uart_port *port) | |
200 | { | |
201 | struct jsm_board *brd; | |
1da177e4 | 202 | struct jsm_channel *channel = (struct jsm_channel *)port; |
606d099c | 203 | struct ktermios *termios; |
1da177e4 LT |
204 | |
205 | /* Get board pointer from our array of majors we have allocated */ | |
206 | brd = channel->ch_bd; | |
207 | ||
208 | /* | |
209 | * Allocate channel buffers for read/write/error. | |
210 | * Set flag, so we don't get trounced on. | |
211 | */ | |
212 | channel->ch_flags |= (CH_OPENING); | |
213 | ||
214 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
215 | ||
216 | if (!channel->ch_rqueue) { | |
8f31bb39 | 217 | channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
218 | if (!channel->ch_rqueue) { |
219 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
220 | "unable to allocate read queue buf"); | |
221 | return -ENOMEM; | |
222 | } | |
1da177e4 LT |
223 | } |
224 | if (!channel->ch_equeue) { | |
8f31bb39 | 225 | channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
226 | if (!channel->ch_equeue) { |
227 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
228 | "unable to allocate error queue buf"); | |
229 | return -ENOMEM; | |
230 | } | |
1da177e4 | 231 | } |
1da177e4 LT |
232 | |
233 | channel->ch_flags &= ~(CH_OPENING); | |
234 | /* | |
235 | * Initialize if neither terminal is open. | |
236 | */ | |
237 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, | |
238 | "jsm_open: initializing channel in open...\n"); | |
239 | ||
240 | /* | |
241 | * Flush input queues. | |
242 | */ | |
243 | channel->ch_r_head = channel->ch_r_tail = 0; | |
244 | channel->ch_e_head = channel->ch_e_tail = 0; | |
1da177e4 LT |
245 | |
246 | brd->bd_ops->flush_uart_write(channel); | |
247 | brd->bd_ops->flush_uart_read(channel); | |
248 | ||
249 | channel->ch_flags = 0; | |
250 | channel->ch_cached_lsr = 0; | |
251 | channel->ch_stops_sent = 0; | |
252 | ||
ebd2c8f6 | 253 | termios = port->state->port.tty->termios; |
a58e00e7 JJ |
254 | channel->ch_c_cflag = termios->c_cflag; |
255 | channel->ch_c_iflag = termios->c_iflag; | |
256 | channel->ch_c_oflag = termios->c_oflag; | |
257 | channel->ch_c_lflag = termios->c_lflag; | |
258 | channel->ch_startc = termios->c_cc[VSTART]; | |
259 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
1da177e4 LT |
260 | |
261 | /* Tell UART to init itself */ | |
262 | brd->bd_ops->uart_init(channel); | |
263 | ||
264 | /* | |
265 | * Run param in case we changed anything | |
266 | */ | |
267 | brd->bd_ops->param(channel); | |
268 | ||
269 | jsm_carrier(channel); | |
270 | ||
271 | channel->ch_open_count++; | |
272 | ||
273 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
8e7d91c9 | 274 | return 0; |
1da177e4 LT |
275 | } |
276 | ||
277 | static void jsm_tty_close(struct uart_port *port) | |
278 | { | |
279 | struct jsm_board *bd; | |
606d099c | 280 | struct ktermios *ts; |
1da177e4 LT |
281 | struct jsm_channel *channel = (struct jsm_channel *)port; |
282 | ||
283 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
284 | ||
285 | bd = channel->ch_bd; | |
ebd2c8f6 | 286 | ts = port->state->port.tty->termios; |
1da177e4 LT |
287 | |
288 | channel->ch_flags &= ~(CH_STOPI); | |
289 | ||
290 | channel->ch_open_count--; | |
291 | ||
292 | /* | |
293 | * If we have HUPCL set, lower DTR and RTS | |
294 | */ | |
295 | if (channel->ch_c_cflag & HUPCL) { | |
296 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, | |
297 | "Close. HUPCL set, dropping DTR/RTS\n"); | |
298 | ||
299 | /* Drop RTS/DTR */ | |
300 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
301 | bd->bd_ops->assert_modem_signals(channel); | |
302 | } | |
303 | ||
1da177e4 LT |
304 | /* Turn off UART interrupts for this port */ |
305 | channel->ch_bd->bd_ops->uart_off(channel); | |
306 | ||
307 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
308 | } | |
309 | ||
310 | static void jsm_tty_set_termios(struct uart_port *port, | |
606d099c AC |
311 | struct ktermios *termios, |
312 | struct ktermios *old_termios) | |
1da177e4 LT |
313 | { |
314 | unsigned long lock_flags; | |
315 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
316 | ||
317 | spin_lock_irqsave(&port->lock, lock_flags); | |
318 | channel->ch_c_cflag = termios->c_cflag; | |
319 | channel->ch_c_iflag = termios->c_iflag; | |
320 | channel->ch_c_oflag = termios->c_oflag; | |
321 | channel->ch_c_lflag = termios->c_lflag; | |
322 | channel->ch_startc = termios->c_cc[VSTART]; | |
323 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
324 | ||
325 | channel->ch_bd->bd_ops->param(channel); | |
326 | jsm_carrier(channel); | |
327 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
328 | } | |
329 | ||
330 | static const char *jsm_tty_type(struct uart_port *port) | |
331 | { | |
332 | return "jsm"; | |
333 | } | |
334 | ||
335 | static void jsm_tty_release_port(struct uart_port *port) | |
336 | { | |
337 | } | |
338 | ||
339 | static int jsm_tty_request_port(struct uart_port *port) | |
340 | { | |
341 | return 0; | |
342 | } | |
343 | ||
344 | static void jsm_config_port(struct uart_port *port, int flags) | |
345 | { | |
346 | port->type = PORT_JSM; | |
347 | } | |
348 | ||
349 | static struct uart_ops jsm_ops = { | |
350 | .tx_empty = jsm_tty_tx_empty, | |
351 | .set_mctrl = jsm_tty_set_mctrl, | |
352 | .get_mctrl = jsm_tty_get_mctrl, | |
353 | .stop_tx = jsm_tty_stop_tx, | |
354 | .start_tx = jsm_tty_start_tx, | |
355 | .send_xchar = jsm_tty_send_xchar, | |
356 | .stop_rx = jsm_tty_stop_rx, | |
0461ec5b | 357 | .enable_ms = jsm_tty_enable_ms, |
1da177e4 LT |
358 | .break_ctl = jsm_tty_break, |
359 | .startup = jsm_tty_open, | |
360 | .shutdown = jsm_tty_close, | |
361 | .set_termios = jsm_tty_set_termios, | |
362 | .type = jsm_tty_type, | |
363 | .release_port = jsm_tty_release_port, | |
364 | .request_port = jsm_tty_request_port, | |
365 | .config_port = jsm_config_port, | |
366 | }; | |
367 | ||
368 | /* | |
369 | * jsm_tty_init() | |
370 | * | |
371 | * Init the tty subsystem. Called once per board after board has been | |
372 | * downloaded and init'ed. | |
373 | */ | |
aacf17ad | 374 | int __devinit jsm_tty_init(struct jsm_board *brd) |
1da177e4 LT |
375 | { |
376 | int i; | |
377 | void __iomem *vaddr; | |
378 | struct jsm_channel *ch; | |
379 | ||
380 | if (!brd) | |
381 | return -ENXIO; | |
382 | ||
383 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
384 | ||
385 | /* | |
386 | * Initialize board structure elements. | |
387 | */ | |
388 | ||
389 | brd->nasync = brd->maxports; | |
390 | ||
391 | /* | |
392 | * Allocate channel memory that might not have been allocated | |
393 | * when the driver was first loaded. | |
394 | */ | |
395 | for (i = 0; i < brd->nasync; i++) { | |
396 | if (!brd->channels[i]) { | |
397 | ||
398 | /* | |
399 | * Okay to malloc with GFP_KERNEL, we are not at | |
400 | * interrupt context, and there are no locks held. | |
401 | */ | |
8f31bb39 | 402 | brd->channels[i] = kzalloc(sizeof(struct jsm_channel), GFP_KERNEL); |
1da177e4 LT |
403 | if (!brd->channels[i]) { |
404 | jsm_printk(CORE, ERR, &brd->pci_dev, | |
405 | "%s:%d Unable to allocate memory for channel struct\n", | |
406 | __FILE__, __LINE__); | |
407 | } | |
1da177e4 LT |
408 | } |
409 | } | |
410 | ||
411 | ch = brd->channels[0]; | |
412 | vaddr = brd->re_map_membase; | |
413 | ||
414 | /* Set up channel variables */ | |
415 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
416 | ||
417 | if (!brd->channels[i]) | |
418 | continue; | |
419 | ||
420 | spin_lock_init(&ch->ch_lock); | |
421 | ||
422 | if (brd->bd_uart_offset == 0x200) | |
423 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); | |
424 | ||
425 | ch->ch_bd = brd; | |
426 | ch->ch_portnum = i; | |
427 | ||
428 | /* .25 second delay */ | |
429 | ch->ch_close_delay = 250; | |
430 | ||
431 | init_waitqueue_head(&ch->ch_flags_wait); | |
432 | } | |
433 | ||
434 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
435 | return 0; | |
436 | } | |
437 | ||
e6bdf24c | 438 | int jsm_uart_port_init(struct jsm_board *brd) |
1da177e4 | 439 | { |
137ee2f5 | 440 | int i, rc; |
13858d36 | 441 | unsigned int line; |
1da177e4 LT |
442 | struct jsm_channel *ch; |
443 | ||
444 | if (!brd) | |
445 | return -ENXIO; | |
446 | ||
447 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
448 | ||
449 | /* | |
450 | * Initialize board structure elements. | |
451 | */ | |
452 | ||
453 | brd->nasync = brd->maxports; | |
454 | ||
455 | /* Set up channel variables */ | |
456 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
457 | ||
458 | if (!brd->channels[i]) | |
459 | continue; | |
460 | ||
461 | brd->channels[i]->uart_port.irq = brd->irq; | |
3c04c272 | 462 | brd->channels[i]->uart_port.uartclk = 14745600; |
1da177e4 LT |
463 | brd->channels[i]->uart_port.type = PORT_JSM; |
464 | brd->channels[i]->uart_port.iotype = UPIO_MEM; | |
465 | brd->channels[i]->uart_port.membase = brd->re_map_membase; | |
466 | brd->channels[i]->uart_port.fifosize = 16; | |
467 | brd->channels[i]->uart_port.ops = &jsm_ops; | |
13858d36 AF |
468 | line = find_first_zero_bit(linemap, MAXLINES); |
469 | if (line >= MAXLINES) { | |
470 | printk(KERN_INFO "jsm: linemap is full, added device failed\n"); | |
471 | continue; | |
472 | } else | |
2a13373c | 473 | set_bit(line, linemap); |
13858d36 | 474 | brd->channels[i]->uart_port.line = line; |
137ee2f5 BL |
475 | rc = uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port); |
476 | if (rc){ | |
477 | printk(KERN_INFO "jsm: Port %d failed. Aborting...\n", i); | |
478 | return rc; | |
479 | } | |
1da177e4 | 480 | else |
354aaf96 | 481 | printk(KERN_INFO "jsm: Port %d added\n", i); |
1da177e4 LT |
482 | } |
483 | ||
484 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
485 | return 0; | |
486 | } | |
487 | ||
488 | int jsm_remove_uart_port(struct jsm_board *brd) | |
489 | { | |
490 | int i; | |
491 | struct jsm_channel *ch; | |
492 | ||
493 | if (!brd) | |
494 | return -ENXIO; | |
495 | ||
496 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
497 | ||
498 | /* | |
499 | * Initialize board structure elements. | |
500 | */ | |
501 | ||
502 | brd->nasync = brd->maxports; | |
503 | ||
504 | /* Set up channel variables */ | |
505 | for (i = 0; i < brd->nasync; i++) { | |
506 | ||
507 | if (!brd->channels[i]) | |
508 | continue; | |
509 | ||
510 | ch = brd->channels[i]; | |
511 | ||
2a13373c | 512 | clear_bit(ch->uart_port.line, linemap); |
1da177e4 LT |
513 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); |
514 | } | |
515 | ||
516 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
517 | return 0; | |
518 | } | |
519 | ||
520 | void jsm_input(struct jsm_channel *ch) | |
521 | { | |
522 | struct jsm_board *bd; | |
523 | struct tty_struct *tp; | |
524 | u32 rmask; | |
525 | u16 head; | |
526 | u16 tail; | |
527 | int data_len; | |
528 | unsigned long lock_flags; | |
1da177e4 LT |
529 | int len = 0; |
530 | int n = 0; | |
1da177e4 LT |
531 | int s = 0; |
532 | int i = 0; | |
533 | ||
534 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
535 | ||
536 | if (!ch) | |
537 | return; | |
538 | ||
ebd2c8f6 | 539 | tp = ch->uart_port.state->port.tty; |
1da177e4 LT |
540 | |
541 | bd = ch->ch_bd; | |
542 | if(!bd) | |
543 | return; | |
544 | ||
545 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
546 | ||
547 | /* | |
548 | *Figure the number of characters in the buffer. | |
549 | *Exit immediately if none. | |
550 | */ | |
551 | ||
552 | rmask = RQUEUEMASK; | |
553 | ||
554 | head = ch->ch_r_head & rmask; | |
555 | tail = ch->ch_r_tail & rmask; | |
556 | ||
557 | data_len = (head - tail) & rmask; | |
558 | if (data_len == 0) { | |
559 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
560 | return; | |
561 | } | |
562 | ||
563 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
564 | ||
565 | /* | |
566 | *If the device is not open, or CREAD is off, flush | |
567 | *input data and return immediately. | |
568 | */ | |
569 | if (!tp || | |
570 | !(tp->termios->c_cflag & CREAD) ) { | |
571 | ||
572 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
573 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); | |
574 | ch->ch_r_head = tail; | |
575 | ||
576 | /* Force queue flow control to be released, if needed */ | |
577 | jsm_check_queue_flow_control(ch); | |
578 | ||
579 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
580 | return; | |
581 | } | |
582 | ||
583 | /* | |
584 | * If we are throttled, simply don't read any data. | |
585 | */ | |
586 | if (ch->ch_flags & CH_STOPI) { | |
587 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
588 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
589 | "Port %d throttled, not reading any data. head: %x tail: %x\n", | |
590 | ch->ch_portnum, head, tail); | |
591 | return; | |
592 | } | |
593 | ||
594 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); | |
595 | ||
7ba4b927 | 596 | if (data_len <= 0) { |
0a577ce3 AK |
597 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
598 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); | |
0a577ce3 | 599 | return; |
1da177e4 LT |
600 | } |
601 | ||
7ba4b927 | 602 | len = tty_buffer_request_room(tp, data_len); |
1da177e4 LT |
603 | n = len; |
604 | ||
605 | /* | |
606 | * n now contains the most amount of data we can copy, | |
607 | * bounded either by the flip buffer size or the amount | |
608 | * of data the card actually has pending... | |
609 | */ | |
610 | while (n) { | |
611 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
612 | s = min(s, n); | |
613 | ||
614 | if (s <= 0) | |
615 | break; | |
616 | ||
0a577ce3 AK |
617 | /* |
618 | * If conditions are such that ld needs to see all | |
619 | * UART errors, we will have to walk each character | |
620 | * and error byte and send them to the buffer one at | |
621 | * a time. | |
622 | */ | |
1da177e4 | 623 | |
1da177e4 | 624 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
0a577ce3 | 625 | for (i = 0; i < s; i++) { |
1da177e4 LT |
626 | /* |
627 | * Give the Linux ld the flags in the | |
628 | * format it likes. | |
629 | */ | |
0a577ce3 AK |
630 | if (*(ch->ch_equeue +tail +i) & UART_LSR_BI) |
631 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_BREAK); | |
632 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE) | |
633 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY); | |
634 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE) | |
635 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME); | |
1da177e4 | 636 | else |
7ba4b927 | 637 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL); |
1da177e4 LT |
638 | } |
639 | } else { | |
0a577ce3 | 640 | tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ; |
1da177e4 | 641 | } |
0a577ce3 AK |
642 | tail += s; |
643 | n -= s; | |
644 | /* Flip queue if needed */ | |
645 | tail &= rmask; | |
1da177e4 LT |
646 | } |
647 | ||
0a577ce3 AK |
648 | ch->ch_r_tail = tail & rmask; |
649 | ch->ch_e_tail = tail & rmask; | |
650 | jsm_check_queue_flow_control(ch); | |
651 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
1da177e4 | 652 | |
0a577ce3 AK |
653 | /* Tell the tty layer its okay to "eat" the data now */ |
654 | tty_flip_buffer_push(tp); | |
1da177e4 | 655 | |
1da177e4 LT |
656 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); |
657 | } | |
658 | ||
408b664a | 659 | static void jsm_carrier(struct jsm_channel *ch) |
1da177e4 LT |
660 | { |
661 | struct jsm_board *bd; | |
662 | ||
663 | int virt_carrier = 0; | |
664 | int phys_carrier = 0; | |
665 | ||
666 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
667 | if (!ch) | |
668 | return; | |
669 | ||
670 | bd = ch->ch_bd; | |
671 | ||
672 | if (!bd) | |
673 | return; | |
674 | ||
675 | if (ch->ch_mistat & UART_MSR_DCD) { | |
676 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
677 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); | |
678 | phys_carrier = 1; | |
679 | } | |
680 | ||
681 | if (ch->ch_c_cflag & CLOCAL) | |
682 | virt_carrier = 1; | |
683 | ||
684 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
685 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); | |
686 | ||
687 | /* | |
688 | * Test for a VIRTUAL carrier transition to HIGH. | |
689 | */ | |
690 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
691 | ||
692 | /* | |
693 | * When carrier rises, wake any threads waiting | |
694 | * for carrier in the open routine. | |
695 | */ | |
696 | ||
697 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
698 | "carrier: virt DCD rose\n"); | |
699 | ||
700 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
701 | wake_up_interruptible(&ch->ch_flags_wait); | |
702 | } | |
703 | ||
704 | /* | |
705 | * Test for a PHYSICAL carrier transition to HIGH. | |
706 | */ | |
707 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
708 | ||
709 | /* | |
710 | * When carrier rises, wake any threads waiting | |
711 | * for carrier in the open routine. | |
712 | */ | |
713 | ||
714 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
715 | "carrier: physical DCD rose\n"); | |
716 | ||
717 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
718 | wake_up_interruptible(&ch->ch_flags_wait); | |
719 | } | |
720 | ||
721 | /* | |
722 | * Test for a PHYSICAL transition to low, so long as we aren't | |
723 | * currently ignoring physical transitions (which is what "virtual | |
724 | * carrier" indicates). | |
725 | * | |
726 | * The transition of the virtual carrier to low really doesn't | |
727 | * matter... it really only means "ignore carrier state", not | |
728 | * "make pretend that carrier is there". | |
729 | */ | |
730 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) | |
731 | && (phys_carrier == 0)) { | |
732 | /* | |
733 | * When carrier drops: | |
734 | * | |
735 | * Drop carrier on all open units. | |
736 | * | |
737 | * Flush queues, waking up any task waiting in the | |
738 | * line discipline. | |
739 | * | |
740 | * Send a hangup to the control terminal. | |
741 | * | |
742 | * Enable all select calls. | |
743 | */ | |
744 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
745 | wake_up_interruptible(&ch->ch_flags_wait); | |
746 | } | |
747 | ||
748 | /* | |
749 | * Make sure that our cached values reflect the current reality. | |
750 | */ | |
751 | if (virt_carrier == 1) | |
752 | ch->ch_flags |= CH_FCAR; | |
753 | else | |
754 | ch->ch_flags &= ~CH_FCAR; | |
755 | ||
756 | if (phys_carrier == 1) | |
757 | ch->ch_flags |= CH_CD; | |
758 | else | |
759 | ch->ch_flags &= ~CH_CD; | |
760 | } | |
761 | ||
762 | ||
763 | void jsm_check_queue_flow_control(struct jsm_channel *ch) | |
764 | { | |
a58e00e7 | 765 | struct board_ops *bd_ops = ch->ch_bd->bd_ops; |
8e7d91c9 | 766 | int qleft; |
1da177e4 LT |
767 | |
768 | /* Store how much space we have left in the queue */ | |
769 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) | |
770 | qleft += RQUEUEMASK + 1; | |
771 | ||
772 | /* | |
773 | * Check to see if we should enforce flow control on our queue because | |
774 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
775 | * | |
776 | * NOTE: This is done based on what the current flow control of the | |
777 | * port is set for. | |
778 | * | |
779 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
780 | * This will cause the UART's FIFO to back up, and force | |
781 | * the RTS signal to be dropped. | |
782 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
783 | * the other side, in hopes it will stop sending data to us. | |
784 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
785 | * that gets sent into us when the queue fills up. | |
786 | */ | |
787 | if (qleft < 256) { | |
788 | /* HWFLOW */ | |
789 | if (ch->ch_c_cflag & CRTSCTS) { | |
790 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { | |
a58e00e7 | 791 | bd_ops->disable_receiver(ch); |
1da177e4 LT |
792 | ch->ch_flags |= (CH_RECEIVER_OFF); |
793 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
794 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", | |
795 | qleft); | |
796 | } | |
797 | } | |
798 | /* SWFLOW */ | |
799 | else if (ch->ch_c_iflag & IXOFF) { | |
800 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
a58e00e7 | 801 | bd_ops->send_stop_character(ch); |
1da177e4 LT |
802 | ch->ch_stops_sent++; |
803 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
804 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); | |
805 | } | |
806 | } | |
807 | } | |
808 | ||
809 | /* | |
810 | * Check to see if we should unenforce flow control because | |
811 | * ld (or user) finally read enuf data out of our queue. | |
812 | * | |
813 | * NOTE: This is done based on what the current flow control of the | |
814 | * port is set for. | |
815 | * | |
816 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
817 | * This will cause the UART's FIFO to raise RTS back up, | |
818 | * which will allow the other side to start sending data again. | |
819 | * 2) SWFLOW (IXOFF) - Send a start character to | |
820 | * the other side, so it will start sending data to us again. | |
821 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
822 | * other side, we don't need to do anything now. | |
823 | */ | |
824 | if (qleft > (RQUEUESIZE / 2)) { | |
825 | /* HWFLOW */ | |
826 | if (ch->ch_c_cflag & CRTSCTS) { | |
827 | if (ch->ch_flags & CH_RECEIVER_OFF) { | |
a58e00e7 | 828 | bd_ops->enable_receiver(ch); |
1da177e4 LT |
829 | ch->ch_flags &= ~(CH_RECEIVER_OFF); |
830 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
831 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", | |
832 | qleft); | |
833 | } | |
834 | } | |
835 | /* SWFLOW */ | |
836 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
837 | ch->ch_stops_sent = 0; | |
a58e00e7 | 838 | bd_ops->send_start_character(ch); |
1da177e4 LT |
839 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); |
840 | } | |
841 | } | |
842 | } |