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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 | ||
13858d36 AF |
36 | static DECLARE_BITMAP(linemap, MAXLINES); |
37 | ||
408b664a AB |
38 | static void jsm_carrier(struct jsm_channel *ch); |
39 | ||
1da177e4 LT |
40 | static inline int jsm_get_mstat(struct jsm_channel *ch) |
41 | { | |
42 | unsigned char mstat; | |
43 | unsigned result; | |
44 | ||
45 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
46 | ||
47 | mstat = (ch->ch_mostat | ch->ch_mistat); | |
48 | ||
49 | result = 0; | |
50 | ||
51 | if (mstat & UART_MCR_DTR) | |
52 | result |= TIOCM_DTR; | |
53 | if (mstat & UART_MCR_RTS) | |
54 | result |= TIOCM_RTS; | |
55 | if (mstat & UART_MSR_CTS) | |
56 | result |= TIOCM_CTS; | |
57 | if (mstat & UART_MSR_DSR) | |
58 | result |= TIOCM_DSR; | |
59 | if (mstat & UART_MSR_RI) | |
60 | result |= TIOCM_RI; | |
61 | if (mstat & UART_MSR_DCD) | |
62 | result |= TIOCM_CD; | |
63 | ||
64 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); | |
65 | return result; | |
66 | } | |
67 | ||
68 | static unsigned int jsm_tty_tx_empty(struct uart_port *port) | |
69 | { | |
70 | return TIOCSER_TEMT; | |
71 | } | |
72 | ||
73 | /* | |
74 | * Return modem signals to ld. | |
75 | */ | |
76 | static unsigned int jsm_tty_get_mctrl(struct uart_port *port) | |
77 | { | |
78 | int result; | |
79 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
80 | ||
81 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
82 | ||
83 | result = jsm_get_mstat(channel); | |
84 | ||
85 | if (result < 0) | |
86 | return -ENXIO; | |
87 | ||
88 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
89 | ||
90 | return result; | |
91 | } | |
92 | ||
93 | /* | |
94 | * jsm_set_modem_info() | |
95 | * | |
96 | * Set modem signals, called by ld. | |
97 | */ | |
98 | static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
99 | { | |
100 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
101 | ||
102 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
103 | ||
104 | if (mctrl & TIOCM_RTS) | |
105 | channel->ch_mostat |= UART_MCR_RTS; | |
106 | else | |
107 | channel->ch_mostat &= ~UART_MCR_RTS; | |
108 | ||
109 | if (mctrl & TIOCM_DTR) | |
110 | channel->ch_mostat |= UART_MCR_DTR; | |
111 | else | |
112 | channel->ch_mostat &= ~UART_MCR_DTR; | |
113 | ||
114 | channel->ch_bd->bd_ops->assert_modem_signals(channel); | |
115 | ||
116 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
117 | udelay(10); | |
118 | } | |
119 | ||
b129a8cc | 120 | static void jsm_tty_start_tx(struct uart_port *port) |
1da177e4 LT |
121 | { |
122 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
123 | ||
124 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
125 | ||
126 | channel->ch_flags &= ~(CH_STOP); | |
127 | jsm_tty_write(port); | |
128 | ||
129 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
130 | } | |
131 | ||
b129a8cc | 132 | static void jsm_tty_stop_tx(struct uart_port *port) |
1da177e4 LT |
133 | { |
134 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
135 | ||
136 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
137 | ||
138 | channel->ch_flags |= (CH_STOP); | |
139 | ||
140 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
141 | } | |
142 | ||
143 | static void jsm_tty_send_xchar(struct uart_port *port, char ch) | |
144 | { | |
145 | unsigned long lock_flags; | |
146 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
606d099c | 147 | struct ktermios *termios; |
1da177e4 LT |
148 | |
149 | spin_lock_irqsave(&port->lock, lock_flags); | |
ebd2c8f6 | 150 | termios = port->state->port.tty->termios; |
a58e00e7 | 151 | if (ch == termios->c_cc[VSTART]) |
1da177e4 LT |
152 | channel->ch_bd->bd_ops->send_start_character(channel); |
153 | ||
a58e00e7 | 154 | if (ch == termios->c_cc[VSTOP]) |
1da177e4 LT |
155 | channel->ch_bd->bd_ops->send_stop_character(channel); |
156 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
157 | } | |
158 | ||
159 | static void jsm_tty_stop_rx(struct uart_port *port) | |
160 | { | |
161 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
162 | ||
163 | channel->ch_bd->bd_ops->disable_receiver(channel); | |
164 | } | |
165 | ||
0461ec5b PL |
166 | static void jsm_tty_enable_ms(struct uart_port *port) |
167 | { | |
168 | /* Nothing needed */ | |
169 | } | |
170 | ||
1da177e4 LT |
171 | static void jsm_tty_break(struct uart_port *port, int break_state) |
172 | { | |
173 | unsigned long lock_flags; | |
174 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
175 | ||
176 | spin_lock_irqsave(&port->lock, lock_flags); | |
177 | if (break_state == -1) | |
178 | channel->ch_bd->bd_ops->send_break(channel); | |
179 | else | |
180 | channel->ch_bd->bd_ops->clear_break(channel, 0); | |
181 | ||
182 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
183 | } | |
184 | ||
185 | static int jsm_tty_open(struct uart_port *port) | |
186 | { | |
187 | struct jsm_board *brd; | |
1da177e4 | 188 | struct jsm_channel *channel = (struct jsm_channel *)port; |
606d099c | 189 | struct ktermios *termios; |
1da177e4 LT |
190 | |
191 | /* Get board pointer from our array of majors we have allocated */ | |
192 | brd = channel->ch_bd; | |
193 | ||
194 | /* | |
195 | * Allocate channel buffers for read/write/error. | |
196 | * Set flag, so we don't get trounced on. | |
197 | */ | |
198 | channel->ch_flags |= (CH_OPENING); | |
199 | ||
200 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
201 | ||
202 | if (!channel->ch_rqueue) { | |
8f31bb39 | 203 | channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
204 | if (!channel->ch_rqueue) { |
205 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
206 | "unable to allocate read queue buf"); | |
207 | return -ENOMEM; | |
208 | } | |
1da177e4 LT |
209 | } |
210 | if (!channel->ch_equeue) { | |
8f31bb39 | 211 | channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
212 | if (!channel->ch_equeue) { |
213 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
214 | "unable to allocate error queue buf"); | |
215 | return -ENOMEM; | |
216 | } | |
1da177e4 LT |
217 | } |
218 | if (!channel->ch_wqueue) { | |
8f31bb39 | 219 | channel->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
220 | if (!channel->ch_wqueue) { |
221 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
222 | "unable to allocate write queue buf"); | |
223 | return -ENOMEM; | |
224 | } | |
1da177e4 LT |
225 | } |
226 | ||
227 | channel->ch_flags &= ~(CH_OPENING); | |
228 | /* | |
229 | * Initialize if neither terminal is open. | |
230 | */ | |
231 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, | |
232 | "jsm_open: initializing channel in open...\n"); | |
233 | ||
234 | /* | |
235 | * Flush input queues. | |
236 | */ | |
237 | channel->ch_r_head = channel->ch_r_tail = 0; | |
238 | channel->ch_e_head = channel->ch_e_tail = 0; | |
239 | channel->ch_w_head = channel->ch_w_tail = 0; | |
240 | ||
241 | brd->bd_ops->flush_uart_write(channel); | |
242 | brd->bd_ops->flush_uart_read(channel); | |
243 | ||
244 | channel->ch_flags = 0; | |
245 | channel->ch_cached_lsr = 0; | |
246 | channel->ch_stops_sent = 0; | |
247 | ||
ebd2c8f6 | 248 | termios = port->state->port.tty->termios; |
a58e00e7 JJ |
249 | channel->ch_c_cflag = termios->c_cflag; |
250 | channel->ch_c_iflag = termios->c_iflag; | |
251 | channel->ch_c_oflag = termios->c_oflag; | |
252 | channel->ch_c_lflag = termios->c_lflag; | |
253 | channel->ch_startc = termios->c_cc[VSTART]; | |
254 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
1da177e4 LT |
255 | |
256 | /* Tell UART to init itself */ | |
257 | brd->bd_ops->uart_init(channel); | |
258 | ||
259 | /* | |
260 | * Run param in case we changed anything | |
261 | */ | |
262 | brd->bd_ops->param(channel); | |
263 | ||
264 | jsm_carrier(channel); | |
265 | ||
266 | channel->ch_open_count++; | |
267 | ||
268 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
8e7d91c9 | 269 | return 0; |
1da177e4 LT |
270 | } |
271 | ||
272 | static void jsm_tty_close(struct uart_port *port) | |
273 | { | |
274 | struct jsm_board *bd; | |
606d099c | 275 | struct ktermios *ts; |
1da177e4 LT |
276 | struct jsm_channel *channel = (struct jsm_channel *)port; |
277 | ||
278 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
279 | ||
280 | bd = channel->ch_bd; | |
ebd2c8f6 | 281 | ts = port->state->port.tty->termios; |
1da177e4 LT |
282 | |
283 | channel->ch_flags &= ~(CH_STOPI); | |
284 | ||
285 | channel->ch_open_count--; | |
286 | ||
287 | /* | |
288 | * If we have HUPCL set, lower DTR and RTS | |
289 | */ | |
290 | if (channel->ch_c_cflag & HUPCL) { | |
291 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, | |
292 | "Close. HUPCL set, dropping DTR/RTS\n"); | |
293 | ||
294 | /* Drop RTS/DTR */ | |
295 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
296 | bd->bd_ops->assert_modem_signals(channel); | |
297 | } | |
298 | ||
1da177e4 LT |
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 | ||
e6bdf24c | 433 | int jsm_uart_port_init(struct jsm_board *brd) |
1da177e4 | 434 | { |
137ee2f5 | 435 | int i, rc; |
13858d36 | 436 | unsigned int line; |
1da177e4 LT |
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; | |
13858d36 AF |
463 | line = find_first_zero_bit(linemap, MAXLINES); |
464 | if (line >= MAXLINES) { | |
465 | printk(KERN_INFO "jsm: linemap is full, added device failed\n"); | |
466 | continue; | |
467 | } else | |
2a13373c | 468 | set_bit(line, linemap); |
13858d36 | 469 | brd->channels[i]->uart_port.line = line; |
137ee2f5 BL |
470 | rc = uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port); |
471 | if (rc){ | |
472 | printk(KERN_INFO "jsm: Port %d failed. Aborting...\n", i); | |
473 | return rc; | |
474 | } | |
1da177e4 | 475 | else |
354aaf96 | 476 | printk(KERN_INFO "jsm: Port %d added\n", i); |
1da177e4 LT |
477 | } |
478 | ||
479 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
480 | return 0; | |
481 | } | |
482 | ||
483 | int jsm_remove_uart_port(struct jsm_board *brd) | |
484 | { | |
485 | int i; | |
486 | struct jsm_channel *ch; | |
487 | ||
488 | if (!brd) | |
489 | return -ENXIO; | |
490 | ||
491 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
492 | ||
493 | /* | |
494 | * Initialize board structure elements. | |
495 | */ | |
496 | ||
497 | brd->nasync = brd->maxports; | |
498 | ||
499 | /* Set up channel variables */ | |
500 | for (i = 0; i < brd->nasync; i++) { | |
501 | ||
502 | if (!brd->channels[i]) | |
503 | continue; | |
504 | ||
505 | ch = brd->channels[i]; | |
506 | ||
2a13373c | 507 | clear_bit(ch->uart_port.line, linemap); |
1da177e4 LT |
508 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); |
509 | } | |
510 | ||
511 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
512 | return 0; | |
513 | } | |
514 | ||
515 | void jsm_input(struct jsm_channel *ch) | |
516 | { | |
517 | struct jsm_board *bd; | |
518 | struct tty_struct *tp; | |
519 | u32 rmask; | |
520 | u16 head; | |
521 | u16 tail; | |
522 | int data_len; | |
523 | unsigned long lock_flags; | |
1da177e4 LT |
524 | int len = 0; |
525 | int n = 0; | |
1da177e4 LT |
526 | int s = 0; |
527 | int i = 0; | |
528 | ||
529 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
530 | ||
531 | if (!ch) | |
532 | return; | |
533 | ||
ebd2c8f6 | 534 | tp = ch->uart_port.state->port.tty; |
1da177e4 LT |
535 | |
536 | bd = ch->ch_bd; | |
537 | if(!bd) | |
538 | return; | |
539 | ||
540 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
541 | ||
542 | /* | |
543 | *Figure the number of characters in the buffer. | |
544 | *Exit immediately if none. | |
545 | */ | |
546 | ||
547 | rmask = RQUEUEMASK; | |
548 | ||
549 | head = ch->ch_r_head & rmask; | |
550 | tail = ch->ch_r_tail & rmask; | |
551 | ||
552 | data_len = (head - tail) & rmask; | |
553 | if (data_len == 0) { | |
554 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
555 | return; | |
556 | } | |
557 | ||
558 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
559 | ||
560 | /* | |
561 | *If the device is not open, or CREAD is off, flush | |
562 | *input data and return immediately. | |
563 | */ | |
564 | if (!tp || | |
565 | !(tp->termios->c_cflag & CREAD) ) { | |
566 | ||
567 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
568 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); | |
569 | ch->ch_r_head = tail; | |
570 | ||
571 | /* Force queue flow control to be released, if needed */ | |
572 | jsm_check_queue_flow_control(ch); | |
573 | ||
574 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
575 | return; | |
576 | } | |
577 | ||
578 | /* | |
579 | * If we are throttled, simply don't read any data. | |
580 | */ | |
581 | if (ch->ch_flags & CH_STOPI) { | |
582 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
583 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
584 | "Port %d throttled, not reading any data. head: %x tail: %x\n", | |
585 | ch->ch_portnum, head, tail); | |
586 | return; | |
587 | } | |
588 | ||
589 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); | |
590 | ||
7ba4b927 | 591 | if (data_len <= 0) { |
0a577ce3 AK |
592 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
593 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); | |
0a577ce3 | 594 | return; |
1da177e4 LT |
595 | } |
596 | ||
7ba4b927 | 597 | len = tty_buffer_request_room(tp, data_len); |
1da177e4 LT |
598 | n = len; |
599 | ||
600 | /* | |
601 | * n now contains the most amount of data we can copy, | |
602 | * bounded either by the flip buffer size or the amount | |
603 | * of data the card actually has pending... | |
604 | */ | |
605 | while (n) { | |
606 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
607 | s = min(s, n); | |
608 | ||
609 | if (s <= 0) | |
610 | break; | |
611 | ||
0a577ce3 AK |
612 | /* |
613 | * If conditions are such that ld needs to see all | |
614 | * UART errors, we will have to walk each character | |
615 | * and error byte and send them to the buffer one at | |
616 | * a time. | |
617 | */ | |
1da177e4 | 618 | |
1da177e4 | 619 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
0a577ce3 | 620 | for (i = 0; i < s; i++) { |
1da177e4 LT |
621 | /* |
622 | * Give the Linux ld the flags in the | |
623 | * format it likes. | |
624 | */ | |
0a577ce3 AK |
625 | if (*(ch->ch_equeue +tail +i) & UART_LSR_BI) |
626 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_BREAK); | |
627 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE) | |
628 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY); | |
629 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE) | |
630 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME); | |
1da177e4 | 631 | else |
7ba4b927 | 632 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL); |
1da177e4 LT |
633 | } |
634 | } else { | |
0a577ce3 | 635 | tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ; |
1da177e4 | 636 | } |
0a577ce3 AK |
637 | tail += s; |
638 | n -= s; | |
639 | /* Flip queue if needed */ | |
640 | tail &= rmask; | |
1da177e4 LT |
641 | } |
642 | ||
0a577ce3 AK |
643 | ch->ch_r_tail = tail & rmask; |
644 | ch->ch_e_tail = tail & rmask; | |
645 | jsm_check_queue_flow_control(ch); | |
646 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
1da177e4 | 647 | |
0a577ce3 AK |
648 | /* Tell the tty layer its okay to "eat" the data now */ |
649 | tty_flip_buffer_push(tp); | |
1da177e4 | 650 | |
1da177e4 LT |
651 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); |
652 | } | |
653 | ||
408b664a | 654 | static void jsm_carrier(struct jsm_channel *ch) |
1da177e4 LT |
655 | { |
656 | struct jsm_board *bd; | |
657 | ||
658 | int virt_carrier = 0; | |
659 | int phys_carrier = 0; | |
660 | ||
661 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
662 | if (!ch) | |
663 | return; | |
664 | ||
665 | bd = ch->ch_bd; | |
666 | ||
667 | if (!bd) | |
668 | return; | |
669 | ||
670 | if (ch->ch_mistat & UART_MSR_DCD) { | |
671 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
672 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); | |
673 | phys_carrier = 1; | |
674 | } | |
675 | ||
676 | if (ch->ch_c_cflag & CLOCAL) | |
677 | virt_carrier = 1; | |
678 | ||
679 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
680 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); | |
681 | ||
682 | /* | |
683 | * Test for a VIRTUAL carrier transition to HIGH. | |
684 | */ | |
685 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
686 | ||
687 | /* | |
688 | * When carrier rises, wake any threads waiting | |
689 | * for carrier in the open routine. | |
690 | */ | |
691 | ||
692 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
693 | "carrier: virt DCD rose\n"); | |
694 | ||
695 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
696 | wake_up_interruptible(&ch->ch_flags_wait); | |
697 | } | |
698 | ||
699 | /* | |
700 | * Test for a PHYSICAL carrier transition to HIGH. | |
701 | */ | |
702 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
703 | ||
704 | /* | |
705 | * When carrier rises, wake any threads waiting | |
706 | * for carrier in the open routine. | |
707 | */ | |
708 | ||
709 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
710 | "carrier: physical DCD rose\n"); | |
711 | ||
712 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
713 | wake_up_interruptible(&ch->ch_flags_wait); | |
714 | } | |
715 | ||
716 | /* | |
717 | * Test for a PHYSICAL transition to low, so long as we aren't | |
718 | * currently ignoring physical transitions (which is what "virtual | |
719 | * carrier" indicates). | |
720 | * | |
721 | * The transition of the virtual carrier to low really doesn't | |
722 | * matter... it really only means "ignore carrier state", not | |
723 | * "make pretend that carrier is there". | |
724 | */ | |
725 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) | |
726 | && (phys_carrier == 0)) { | |
727 | /* | |
728 | * When carrier drops: | |
729 | * | |
730 | * Drop carrier on all open units. | |
731 | * | |
732 | * Flush queues, waking up any task waiting in the | |
733 | * line discipline. | |
734 | * | |
735 | * Send a hangup to the control terminal. | |
736 | * | |
737 | * Enable all select calls. | |
738 | */ | |
739 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
740 | wake_up_interruptible(&ch->ch_flags_wait); | |
741 | } | |
742 | ||
743 | /* | |
744 | * Make sure that our cached values reflect the current reality. | |
745 | */ | |
746 | if (virt_carrier == 1) | |
747 | ch->ch_flags |= CH_FCAR; | |
748 | else | |
749 | ch->ch_flags &= ~CH_FCAR; | |
750 | ||
751 | if (phys_carrier == 1) | |
752 | ch->ch_flags |= CH_CD; | |
753 | else | |
754 | ch->ch_flags &= ~CH_CD; | |
755 | } | |
756 | ||
757 | ||
758 | void jsm_check_queue_flow_control(struct jsm_channel *ch) | |
759 | { | |
a58e00e7 | 760 | struct board_ops *bd_ops = ch->ch_bd->bd_ops; |
8e7d91c9 | 761 | int qleft; |
1da177e4 LT |
762 | |
763 | /* Store how much space we have left in the queue */ | |
764 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) | |
765 | qleft += RQUEUEMASK + 1; | |
766 | ||
767 | /* | |
768 | * Check to see if we should enforce flow control on our queue because | |
769 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
770 | * | |
771 | * NOTE: This is done based on what the current flow control of the | |
772 | * port is set for. | |
773 | * | |
774 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
775 | * This will cause the UART's FIFO to back up, and force | |
776 | * the RTS signal to be dropped. | |
777 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
778 | * the other side, in hopes it will stop sending data to us. | |
779 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
780 | * that gets sent into us when the queue fills up. | |
781 | */ | |
782 | if (qleft < 256) { | |
783 | /* HWFLOW */ | |
784 | if (ch->ch_c_cflag & CRTSCTS) { | |
785 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { | |
a58e00e7 | 786 | bd_ops->disable_receiver(ch); |
1da177e4 LT |
787 | ch->ch_flags |= (CH_RECEIVER_OFF); |
788 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
789 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", | |
790 | qleft); | |
791 | } | |
792 | } | |
793 | /* SWFLOW */ | |
794 | else if (ch->ch_c_iflag & IXOFF) { | |
795 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
a58e00e7 | 796 | bd_ops->send_stop_character(ch); |
1da177e4 LT |
797 | ch->ch_stops_sent++; |
798 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
799 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); | |
800 | } | |
801 | } | |
802 | } | |
803 | ||
804 | /* | |
805 | * Check to see if we should unenforce flow control because | |
806 | * ld (or user) finally read enuf data out of our queue. | |
807 | * | |
808 | * NOTE: This is done based on what the current flow control of the | |
809 | * port is set for. | |
810 | * | |
811 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
812 | * This will cause the UART's FIFO to raise RTS back up, | |
813 | * which will allow the other side to start sending data again. | |
814 | * 2) SWFLOW (IXOFF) - Send a start character to | |
815 | * the other side, so it will start sending data to us again. | |
816 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
817 | * other side, we don't need to do anything now. | |
818 | */ | |
819 | if (qleft > (RQUEUESIZE / 2)) { | |
820 | /* HWFLOW */ | |
821 | if (ch->ch_c_cflag & CRTSCTS) { | |
822 | if (ch->ch_flags & CH_RECEIVER_OFF) { | |
a58e00e7 | 823 | bd_ops->enable_receiver(ch); |
1da177e4 LT |
824 | ch->ch_flags &= ~(CH_RECEIVER_OFF); |
825 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
826 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", | |
827 | qleft); | |
828 | } | |
829 | } | |
830 | /* SWFLOW */ | |
831 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
832 | ch->ch_stops_sent = 0; | |
a58e00e7 | 833 | bd_ops->send_start_character(ch); |
1da177e4 LT |
834 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); |
835 | } | |
836 | } | |
837 | } | |
838 | ||
839 | /* | |
840 | * jsm_tty_write() | |
841 | * | |
842 | * Take data from the user or kernel and send it out to the FEP. | |
843 | * In here exists all the Transparent Print magic as well. | |
844 | */ | |
845 | int jsm_tty_write(struct uart_port *port) | |
846 | { | |
8e7d91c9 | 847 | int bufcount; |
1da177e4 LT |
848 | int data_count = 0,data_count1 =0; |
849 | u16 head; | |
850 | u16 tail; | |
851 | u16 tmask; | |
852 | u32 remain; | |
ebd2c8f6 | 853 | int temp_tail = port->state->xmit.tail; |
1da177e4 LT |
854 | struct jsm_channel *channel = (struct jsm_channel *)port; |
855 | ||
856 | tmask = WQUEUEMASK; | |
857 | head = (channel->ch_w_head) & tmask; | |
858 | tail = (channel->ch_w_tail) & tmask; | |
859 | ||
860 | if ((bufcount = tail - head - 1) < 0) | |
861 | bufcount += WQUEUESIZE; | |
862 | ||
8e7d91c9 | 863 | bufcount = min(bufcount, 56); |
1da177e4 LT |
864 | remain = WQUEUESIZE - head; |
865 | ||
866 | data_count = 0; | |
8e7d91c9 BL |
867 | if (bufcount >= remain) { |
868 | bufcount -= remain; | |
ebd2c8f6 | 869 | while ((port->state->xmit.head != temp_tail) && |
1da177e4 LT |
870 | (data_count < remain)) { |
871 | channel->ch_wqueue[head++] = | |
ebd2c8f6 | 872 | port->state->xmit.buf[temp_tail]; |
1da177e4 LT |
873 | |
874 | temp_tail++; | |
875 | temp_tail &= (UART_XMIT_SIZE - 1); | |
876 | data_count++; | |
877 | } | |
878 | if (data_count == remain) head = 0; | |
879 | } | |
880 | ||
881 | data_count1 = 0; | |
8e7d91c9 BL |
882 | if (bufcount > 0) { |
883 | remain = bufcount; | |
ebd2c8f6 | 884 | while ((port->state->xmit.head != temp_tail) && |
1da177e4 LT |
885 | (data_count1 < remain)) { |
886 | channel->ch_wqueue[head++] = | |
ebd2c8f6 | 887 | port->state->xmit.buf[temp_tail]; |
1da177e4 LT |
888 | |
889 | temp_tail++; | |
890 | temp_tail &= (UART_XMIT_SIZE - 1); | |
891 | data_count1++; | |
892 | ||
893 | } | |
894 | } | |
895 | ||
ebd2c8f6 | 896 | port->state->xmit.tail = temp_tail; |
1da177e4 LT |
897 | |
898 | data_count += data_count1; | |
899 | if (data_count) { | |
900 | head &= tmask; | |
901 | channel->ch_w_head = head; | |
902 | } | |
903 | ||
904 | if (data_count) { | |
905 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); | |
906 | } | |
907 | ||
908 | return data_count; | |
909 | } |