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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 | ||
b129a8cc | 121 | static void jsm_tty_start_tx(struct uart_port *port) |
1da177e4 LT |
122 | { |
123 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
124 | ||
125 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
126 | ||
127 | channel->ch_flags &= ~(CH_STOP); | |
128 | jsm_tty_write(port); | |
129 | ||
130 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
131 | } | |
132 | ||
b129a8cc | 133 | static void jsm_tty_stop_tx(struct uart_port *port) |
1da177e4 LT |
134 | { |
135 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
136 | ||
137 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
138 | ||
139 | channel->ch_flags |= (CH_STOP); | |
140 | ||
141 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
142 | } | |
143 | ||
144 | static void jsm_tty_send_xchar(struct uart_port *port, char ch) | |
145 | { | |
146 | unsigned long lock_flags; | |
147 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
606d099c | 148 | struct ktermios *termios; |
1da177e4 LT |
149 | |
150 | spin_lock_irqsave(&port->lock, lock_flags); | |
ebd2c8f6 | 151 | termios = port->state->port.tty->termios; |
a58e00e7 | 152 | if (ch == termios->c_cc[VSTART]) |
1da177e4 LT |
153 | channel->ch_bd->bd_ops->send_start_character(channel); |
154 | ||
a58e00e7 | 155 | if (ch == termios->c_cc[VSTOP]) |
1da177e4 LT |
156 | channel->ch_bd->bd_ops->send_stop_character(channel); |
157 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
158 | } | |
159 | ||
160 | static void jsm_tty_stop_rx(struct uart_port *port) | |
161 | { | |
162 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
163 | ||
164 | channel->ch_bd->bd_ops->disable_receiver(channel); | |
165 | } | |
166 | ||
0461ec5b PL |
167 | static void jsm_tty_enable_ms(struct uart_port *port) |
168 | { | |
169 | /* Nothing needed */ | |
170 | } | |
171 | ||
1da177e4 LT |
172 | static void jsm_tty_break(struct uart_port *port, int break_state) |
173 | { | |
174 | unsigned long lock_flags; | |
175 | struct jsm_channel *channel = (struct jsm_channel *)port; | |
176 | ||
177 | spin_lock_irqsave(&port->lock, lock_flags); | |
178 | if (break_state == -1) | |
179 | channel->ch_bd->bd_ops->send_break(channel); | |
180 | else | |
181 | channel->ch_bd->bd_ops->clear_break(channel, 0); | |
182 | ||
183 | spin_unlock_irqrestore(&port->lock, lock_flags); | |
184 | } | |
185 | ||
186 | static int jsm_tty_open(struct uart_port *port) | |
187 | { | |
188 | struct jsm_board *brd; | |
1da177e4 | 189 | struct jsm_channel *channel = (struct jsm_channel *)port; |
606d099c | 190 | struct ktermios *termios; |
1da177e4 LT |
191 | |
192 | /* Get board pointer from our array of majors we have allocated */ | |
193 | brd = channel->ch_bd; | |
194 | ||
195 | /* | |
196 | * Allocate channel buffers for read/write/error. | |
197 | * Set flag, so we don't get trounced on. | |
198 | */ | |
199 | channel->ch_flags |= (CH_OPENING); | |
200 | ||
201 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
202 | ||
203 | if (!channel->ch_rqueue) { | |
8f31bb39 | 204 | channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
205 | if (!channel->ch_rqueue) { |
206 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
207 | "unable to allocate read queue buf"); | |
208 | return -ENOMEM; | |
209 | } | |
1da177e4 LT |
210 | } |
211 | if (!channel->ch_equeue) { | |
8f31bb39 | 212 | channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
213 | if (!channel->ch_equeue) { |
214 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
215 | "unable to allocate error queue buf"); | |
216 | return -ENOMEM; | |
217 | } | |
1da177e4 LT |
218 | } |
219 | if (!channel->ch_wqueue) { | |
8f31bb39 | 220 | channel->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
1da177e4 LT |
221 | if (!channel->ch_wqueue) { |
222 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, | |
223 | "unable to allocate write queue buf"); | |
224 | return -ENOMEM; | |
225 | } | |
1da177e4 LT |
226 | } |
227 | ||
228 | channel->ch_flags &= ~(CH_OPENING); | |
229 | /* | |
230 | * Initialize if neither terminal is open. | |
231 | */ | |
232 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, | |
233 | "jsm_open: initializing channel in open...\n"); | |
234 | ||
235 | /* | |
236 | * Flush input queues. | |
237 | */ | |
238 | channel->ch_r_head = channel->ch_r_tail = 0; | |
239 | channel->ch_e_head = channel->ch_e_tail = 0; | |
240 | channel->ch_w_head = channel->ch_w_tail = 0; | |
241 | ||
242 | brd->bd_ops->flush_uart_write(channel); | |
243 | brd->bd_ops->flush_uart_read(channel); | |
244 | ||
245 | channel->ch_flags = 0; | |
246 | channel->ch_cached_lsr = 0; | |
247 | channel->ch_stops_sent = 0; | |
248 | ||
ebd2c8f6 | 249 | termios = port->state->port.tty->termios; |
a58e00e7 JJ |
250 | channel->ch_c_cflag = termios->c_cflag; |
251 | channel->ch_c_iflag = termios->c_iflag; | |
252 | channel->ch_c_oflag = termios->c_oflag; | |
253 | channel->ch_c_lflag = termios->c_lflag; | |
254 | channel->ch_startc = termios->c_cc[VSTART]; | |
255 | channel->ch_stopc = termios->c_cc[VSTOP]; | |
1da177e4 LT |
256 | |
257 | /* Tell UART to init itself */ | |
258 | brd->bd_ops->uart_init(channel); | |
259 | ||
260 | /* | |
261 | * Run param in case we changed anything | |
262 | */ | |
263 | brd->bd_ops->param(channel); | |
264 | ||
265 | jsm_carrier(channel); | |
266 | ||
267 | channel->ch_open_count++; | |
268 | ||
269 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); | |
8e7d91c9 | 270 | return 0; |
1da177e4 LT |
271 | } |
272 | ||
273 | static void jsm_tty_close(struct uart_port *port) | |
274 | { | |
275 | struct jsm_board *bd; | |
606d099c | 276 | struct ktermios *ts; |
1da177e4 LT |
277 | struct jsm_channel *channel = (struct jsm_channel *)port; |
278 | ||
279 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); | |
280 | ||
281 | bd = channel->ch_bd; | |
ebd2c8f6 | 282 | ts = port->state->port.tty->termios; |
1da177e4 LT |
283 | |
284 | channel->ch_flags &= ~(CH_STOPI); | |
285 | ||
286 | channel->ch_open_count--; | |
287 | ||
288 | /* | |
289 | * If we have HUPCL set, lower DTR and RTS | |
290 | */ | |
291 | if (channel->ch_c_cflag & HUPCL) { | |
292 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, | |
293 | "Close. HUPCL set, dropping DTR/RTS\n"); | |
294 | ||
295 | /* Drop RTS/DTR */ | |
296 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
297 | bd->bd_ops->assert_modem_signals(channel); | |
298 | } | |
299 | ||
1da177e4 LT |
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 | ||
e6bdf24c | 434 | int jsm_uart_port_init(struct jsm_board *brd) |
1da177e4 | 435 | { |
137ee2f5 | 436 | int i, rc; |
13858d36 | 437 | unsigned int line; |
1da177e4 LT |
438 | struct jsm_channel *ch; |
439 | ||
440 | if (!brd) | |
441 | return -ENXIO; | |
442 | ||
443 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
444 | ||
445 | /* | |
446 | * Initialize board structure elements. | |
447 | */ | |
448 | ||
449 | brd->nasync = brd->maxports; | |
450 | ||
451 | /* Set up channel variables */ | |
452 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
453 | ||
454 | if (!brd->channels[i]) | |
455 | continue; | |
456 | ||
457 | brd->channels[i]->uart_port.irq = brd->irq; | |
3c04c272 | 458 | brd->channels[i]->uart_port.uartclk = 14745600; |
1da177e4 LT |
459 | brd->channels[i]->uart_port.type = PORT_JSM; |
460 | brd->channels[i]->uart_port.iotype = UPIO_MEM; | |
461 | brd->channels[i]->uart_port.membase = brd->re_map_membase; | |
462 | brd->channels[i]->uart_port.fifosize = 16; | |
463 | brd->channels[i]->uart_port.ops = &jsm_ops; | |
13858d36 AF |
464 | line = find_first_zero_bit(linemap, MAXLINES); |
465 | if (line >= MAXLINES) { | |
466 | printk(KERN_INFO "jsm: linemap is full, added device failed\n"); | |
467 | continue; | |
468 | } else | |
2a13373c | 469 | set_bit(line, linemap); |
13858d36 | 470 | brd->channels[i]->uart_port.line = line; |
137ee2f5 BL |
471 | rc = uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port); |
472 | if (rc){ | |
473 | printk(KERN_INFO "jsm: Port %d failed. Aborting...\n", i); | |
474 | return rc; | |
475 | } | |
1da177e4 | 476 | else |
354aaf96 | 477 | printk(KERN_INFO "jsm: Port %d added\n", i); |
1da177e4 LT |
478 | } |
479 | ||
480 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
481 | return 0; | |
482 | } | |
483 | ||
484 | int jsm_remove_uart_port(struct jsm_board *brd) | |
485 | { | |
486 | int i; | |
487 | struct jsm_channel *ch; | |
488 | ||
489 | if (!brd) | |
490 | return -ENXIO; | |
491 | ||
492 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); | |
493 | ||
494 | /* | |
495 | * Initialize board structure elements. | |
496 | */ | |
497 | ||
498 | brd->nasync = brd->maxports; | |
499 | ||
500 | /* Set up channel variables */ | |
501 | for (i = 0; i < brd->nasync; i++) { | |
502 | ||
503 | if (!brd->channels[i]) | |
504 | continue; | |
505 | ||
506 | ch = brd->channels[i]; | |
507 | ||
2a13373c | 508 | clear_bit(ch->uart_port.line, linemap); |
1da177e4 LT |
509 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); |
510 | } | |
511 | ||
512 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | void jsm_input(struct jsm_channel *ch) | |
517 | { | |
518 | struct jsm_board *bd; | |
519 | struct tty_struct *tp; | |
520 | u32 rmask; | |
521 | u16 head; | |
522 | u16 tail; | |
523 | int data_len; | |
524 | unsigned long lock_flags; | |
1da177e4 LT |
525 | int len = 0; |
526 | int n = 0; | |
1da177e4 LT |
527 | int s = 0; |
528 | int i = 0; | |
529 | ||
530 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
531 | ||
532 | if (!ch) | |
533 | return; | |
534 | ||
ebd2c8f6 | 535 | tp = ch->uart_port.state->port.tty; |
1da177e4 LT |
536 | |
537 | bd = ch->ch_bd; | |
538 | if(!bd) | |
539 | return; | |
540 | ||
541 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
542 | ||
543 | /* | |
544 | *Figure the number of characters in the buffer. | |
545 | *Exit immediately if none. | |
546 | */ | |
547 | ||
548 | rmask = RQUEUEMASK; | |
549 | ||
550 | head = ch->ch_r_head & rmask; | |
551 | tail = ch->ch_r_tail & rmask; | |
552 | ||
553 | data_len = (head - tail) & rmask; | |
554 | if (data_len == 0) { | |
555 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
556 | return; | |
557 | } | |
558 | ||
559 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
560 | ||
561 | /* | |
562 | *If the device is not open, or CREAD is off, flush | |
563 | *input data and return immediately. | |
564 | */ | |
565 | if (!tp || | |
566 | !(tp->termios->c_cflag & CREAD) ) { | |
567 | ||
568 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
569 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); | |
570 | ch->ch_r_head = tail; | |
571 | ||
572 | /* Force queue flow control to be released, if needed */ | |
573 | jsm_check_queue_flow_control(ch); | |
574 | ||
575 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
576 | return; | |
577 | } | |
578 | ||
579 | /* | |
580 | * If we are throttled, simply don't read any data. | |
581 | */ | |
582 | if (ch->ch_flags & CH_STOPI) { | |
583 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
584 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
585 | "Port %d throttled, not reading any data. head: %x tail: %x\n", | |
586 | ch->ch_portnum, head, tail); | |
587 | return; | |
588 | } | |
589 | ||
590 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); | |
591 | ||
7ba4b927 | 592 | if (data_len <= 0) { |
0a577ce3 AK |
593 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
594 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); | |
0a577ce3 | 595 | return; |
1da177e4 LT |
596 | } |
597 | ||
7ba4b927 | 598 | len = tty_buffer_request_room(tp, data_len); |
1da177e4 LT |
599 | n = len; |
600 | ||
601 | /* | |
602 | * n now contains the most amount of data we can copy, | |
603 | * bounded either by the flip buffer size or the amount | |
604 | * of data the card actually has pending... | |
605 | */ | |
606 | while (n) { | |
607 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
608 | s = min(s, n); | |
609 | ||
610 | if (s <= 0) | |
611 | break; | |
612 | ||
0a577ce3 AK |
613 | /* |
614 | * If conditions are such that ld needs to see all | |
615 | * UART errors, we will have to walk each character | |
616 | * and error byte and send them to the buffer one at | |
617 | * a time. | |
618 | */ | |
1da177e4 | 619 | |
1da177e4 | 620 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
0a577ce3 | 621 | for (i = 0; i < s; i++) { |
1da177e4 LT |
622 | /* |
623 | * Give the Linux ld the flags in the | |
624 | * format it likes. | |
625 | */ | |
0a577ce3 AK |
626 | if (*(ch->ch_equeue +tail +i) & UART_LSR_BI) |
627 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_BREAK); | |
628 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE) | |
629 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY); | |
630 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE) | |
631 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME); | |
1da177e4 | 632 | else |
7ba4b927 | 633 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL); |
1da177e4 LT |
634 | } |
635 | } else { | |
0a577ce3 | 636 | tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ; |
1da177e4 | 637 | } |
0a577ce3 AK |
638 | tail += s; |
639 | n -= s; | |
640 | /* Flip queue if needed */ | |
641 | tail &= rmask; | |
1da177e4 LT |
642 | } |
643 | ||
0a577ce3 AK |
644 | ch->ch_r_tail = tail & rmask; |
645 | ch->ch_e_tail = tail & rmask; | |
646 | jsm_check_queue_flow_control(ch); | |
647 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
1da177e4 | 648 | |
0a577ce3 AK |
649 | /* Tell the tty layer its okay to "eat" the data now */ |
650 | tty_flip_buffer_push(tp); | |
1da177e4 | 651 | |
1da177e4 LT |
652 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); |
653 | } | |
654 | ||
408b664a | 655 | static void jsm_carrier(struct jsm_channel *ch) |
1da177e4 LT |
656 | { |
657 | struct jsm_board *bd; | |
658 | ||
659 | int virt_carrier = 0; | |
660 | int phys_carrier = 0; | |
661 | ||
662 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); | |
663 | if (!ch) | |
664 | return; | |
665 | ||
666 | bd = ch->ch_bd; | |
667 | ||
668 | if (!bd) | |
669 | return; | |
670 | ||
671 | if (ch->ch_mistat & UART_MSR_DCD) { | |
672 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
673 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); | |
674 | phys_carrier = 1; | |
675 | } | |
676 | ||
677 | if (ch->ch_c_cflag & CLOCAL) | |
678 | virt_carrier = 1; | |
679 | ||
680 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
681 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); | |
682 | ||
683 | /* | |
684 | * Test for a VIRTUAL carrier transition to HIGH. | |
685 | */ | |
686 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
687 | ||
688 | /* | |
689 | * When carrier rises, wake any threads waiting | |
690 | * for carrier in the open routine. | |
691 | */ | |
692 | ||
693 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
694 | "carrier: virt DCD rose\n"); | |
695 | ||
696 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
697 | wake_up_interruptible(&ch->ch_flags_wait); | |
698 | } | |
699 | ||
700 | /* | |
701 | * Test for a PHYSICAL carrier transition to HIGH. | |
702 | */ | |
703 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
704 | ||
705 | /* | |
706 | * When carrier rises, wake any threads waiting | |
707 | * for carrier in the open routine. | |
708 | */ | |
709 | ||
710 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, | |
711 | "carrier: physical DCD rose\n"); | |
712 | ||
713 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
714 | wake_up_interruptible(&ch->ch_flags_wait); | |
715 | } | |
716 | ||
717 | /* | |
718 | * Test for a PHYSICAL transition to low, so long as we aren't | |
719 | * currently ignoring physical transitions (which is what "virtual | |
720 | * carrier" indicates). | |
721 | * | |
722 | * The transition of the virtual carrier to low really doesn't | |
723 | * matter... it really only means "ignore carrier state", not | |
724 | * "make pretend that carrier is there". | |
725 | */ | |
726 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) | |
727 | && (phys_carrier == 0)) { | |
728 | /* | |
729 | * When carrier drops: | |
730 | * | |
731 | * Drop carrier on all open units. | |
732 | * | |
733 | * Flush queues, waking up any task waiting in the | |
734 | * line discipline. | |
735 | * | |
736 | * Send a hangup to the control terminal. | |
737 | * | |
738 | * Enable all select calls. | |
739 | */ | |
740 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
741 | wake_up_interruptible(&ch->ch_flags_wait); | |
742 | } | |
743 | ||
744 | /* | |
745 | * Make sure that our cached values reflect the current reality. | |
746 | */ | |
747 | if (virt_carrier == 1) | |
748 | ch->ch_flags |= CH_FCAR; | |
749 | else | |
750 | ch->ch_flags &= ~CH_FCAR; | |
751 | ||
752 | if (phys_carrier == 1) | |
753 | ch->ch_flags |= CH_CD; | |
754 | else | |
755 | ch->ch_flags &= ~CH_CD; | |
756 | } | |
757 | ||
758 | ||
759 | void jsm_check_queue_flow_control(struct jsm_channel *ch) | |
760 | { | |
a58e00e7 | 761 | struct board_ops *bd_ops = ch->ch_bd->bd_ops; |
8e7d91c9 | 762 | int qleft; |
1da177e4 LT |
763 | |
764 | /* Store how much space we have left in the queue */ | |
765 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) | |
766 | qleft += RQUEUEMASK + 1; | |
767 | ||
768 | /* | |
769 | * Check to see if we should enforce flow control on our queue because | |
770 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
771 | * | |
772 | * NOTE: This is done based on what the current flow control of the | |
773 | * port is set for. | |
774 | * | |
775 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
776 | * This will cause the UART's FIFO to back up, and force | |
777 | * the RTS signal to be dropped. | |
778 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
779 | * the other side, in hopes it will stop sending data to us. | |
780 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
781 | * that gets sent into us when the queue fills up. | |
782 | */ | |
783 | if (qleft < 256) { | |
784 | /* HWFLOW */ | |
785 | if (ch->ch_c_cflag & CRTSCTS) { | |
786 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { | |
a58e00e7 | 787 | bd_ops->disable_receiver(ch); |
1da177e4 LT |
788 | ch->ch_flags |= (CH_RECEIVER_OFF); |
789 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
790 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", | |
791 | qleft); | |
792 | } | |
793 | } | |
794 | /* SWFLOW */ | |
795 | else if (ch->ch_c_iflag & IXOFF) { | |
796 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
a58e00e7 | 797 | bd_ops->send_stop_character(ch); |
1da177e4 LT |
798 | ch->ch_stops_sent++; |
799 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
800 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); | |
801 | } | |
802 | } | |
803 | } | |
804 | ||
805 | /* | |
806 | * Check to see if we should unenforce flow control because | |
807 | * ld (or user) finally read enuf data out of our queue. | |
808 | * | |
809 | * NOTE: This is done based on what the current flow control of the | |
810 | * port is set for. | |
811 | * | |
812 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
813 | * This will cause the UART's FIFO to raise RTS back up, | |
814 | * which will allow the other side to start sending data again. | |
815 | * 2) SWFLOW (IXOFF) - Send a start character to | |
816 | * the other side, so it will start sending data to us again. | |
817 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
818 | * other side, we don't need to do anything now. | |
819 | */ | |
820 | if (qleft > (RQUEUESIZE / 2)) { | |
821 | /* HWFLOW */ | |
822 | if (ch->ch_c_cflag & CRTSCTS) { | |
823 | if (ch->ch_flags & CH_RECEIVER_OFF) { | |
a58e00e7 | 824 | bd_ops->enable_receiver(ch); |
1da177e4 LT |
825 | ch->ch_flags &= ~(CH_RECEIVER_OFF); |
826 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, | |
827 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", | |
828 | qleft); | |
829 | } | |
830 | } | |
831 | /* SWFLOW */ | |
832 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
833 | ch->ch_stops_sent = 0; | |
a58e00e7 | 834 | bd_ops->send_start_character(ch); |
1da177e4 LT |
835 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); |
836 | } | |
837 | } | |
838 | } | |
839 | ||
840 | /* | |
841 | * jsm_tty_write() | |
842 | * | |
843 | * Take data from the user or kernel and send it out to the FEP. | |
844 | * In here exists all the Transparent Print magic as well. | |
845 | */ | |
846 | int jsm_tty_write(struct uart_port *port) | |
847 | { | |
8e7d91c9 | 848 | int bufcount; |
1da177e4 LT |
849 | int data_count = 0,data_count1 =0; |
850 | u16 head; | |
851 | u16 tail; | |
852 | u16 tmask; | |
853 | u32 remain; | |
ebd2c8f6 | 854 | int temp_tail = port->state->xmit.tail; |
1da177e4 LT |
855 | struct jsm_channel *channel = (struct jsm_channel *)port; |
856 | ||
857 | tmask = WQUEUEMASK; | |
858 | head = (channel->ch_w_head) & tmask; | |
859 | tail = (channel->ch_w_tail) & tmask; | |
860 | ||
861 | if ((bufcount = tail - head - 1) < 0) | |
862 | bufcount += WQUEUESIZE; | |
863 | ||
8e7d91c9 | 864 | bufcount = min(bufcount, 56); |
1da177e4 LT |
865 | remain = WQUEUESIZE - head; |
866 | ||
867 | data_count = 0; | |
8e7d91c9 BL |
868 | if (bufcount >= remain) { |
869 | bufcount -= remain; | |
ebd2c8f6 | 870 | while ((port->state->xmit.head != temp_tail) && |
1da177e4 LT |
871 | (data_count < remain)) { |
872 | channel->ch_wqueue[head++] = | |
ebd2c8f6 | 873 | port->state->xmit.buf[temp_tail]; |
1da177e4 LT |
874 | |
875 | temp_tail++; | |
876 | temp_tail &= (UART_XMIT_SIZE - 1); | |
877 | data_count++; | |
878 | } | |
879 | if (data_count == remain) head = 0; | |
880 | } | |
881 | ||
882 | data_count1 = 0; | |
8e7d91c9 BL |
883 | if (bufcount > 0) { |
884 | remain = bufcount; | |
ebd2c8f6 | 885 | while ((port->state->xmit.head != temp_tail) && |
1da177e4 LT |
886 | (data_count1 < remain)) { |
887 | channel->ch_wqueue[head++] = | |
ebd2c8f6 | 888 | port->state->xmit.buf[temp_tail]; |
1da177e4 LT |
889 | |
890 | temp_tail++; | |
891 | temp_tail &= (UART_XMIT_SIZE - 1); | |
892 | data_count1++; | |
893 | ||
894 | } | |
895 | } | |
896 | ||
ebd2c8f6 | 897 | port->state->xmit.tail = temp_tail; |
1da177e4 LT |
898 | |
899 | data_count += data_count1; | |
900 | if (data_count) { | |
901 | head &= tmask; | |
902 | channel->ch_w_head = head; | |
903 | } | |
904 | ||
905 | if (data_count) { | |
906 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); | |
907 | } | |
908 | ||
909 | return data_count; | |
910 | } |