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1 | /* |
2 | * dashtty.c - tty driver for Dash channels interface. |
3 | * |
4 | * Copyright (C) 2007,2008,2012 Imagination Technologies |
5 | * |
6 | * This file is subject to the terms and conditions of the GNU General Public |
7 | * License. See the file COPYING in the main directory of this archive |
8 | * for more details. |
9 | * |
10 | */ |
11 | |
12 | #include <linux/atomic.h> |
13 | #include <linux/completion.h> |
14 | #include <linux/console.h> |
15 | #include <linux/delay.h> |
16 | #include <linux/export.h> |
17 | #include <linux/init.h> |
18 | #include <linux/kernel.h> |
19 | #include <linux/kthread.h> |
20 | #include <linux/mutex.h> |
21 | #include <linux/sched.h> |
22 | #include <linux/serial.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/spinlock.h> |
25 | #include <linux/string.h> |
26 | #include <linux/timer.h> |
27 | #include <linux/tty.h> |
28 | #include <linux/tty_driver.h> |
29 | #include <linux/tty_flip.h> |
30 | #include <linux/uaccess.h> |
31 | |
32 | #include <asm/da.h> |
33 | |
34 | /* Channel error codes */ |
35 | #define CONAOK 0 |
36 | #define CONERR 1 |
37 | #define CONBAD 2 |
38 | #define CONPRM 3 |
39 | #define CONADR 4 |
40 | #define CONCNT 5 |
41 | #define CONCBF 6 |
42 | #define CONCBE 7 |
43 | #define CONBSY 8 |
44 | |
45 | /* Default channel for the console */ |
46 | #define CONSOLE_CHANNEL 1 |
47 | |
48 | #define NUM_TTY_CHANNELS 6 |
49 | |
50 | /* Auto allocate */ |
51 | #define DA_TTY_MAJOR 0 |
52 | |
53 | /* A speedy poll rate helps the userland debug process connection response. |
54 | * But, if you set it too high then no other userland processes get much |
55 | * of a look in. |
56 | */ |
57 | #define DA_TTY_POLL (HZ / 50) |
58 | |
59 | /* |
60 | * A short put delay improves latency but has a high throughput overhead |
61 | */ |
62 | #define DA_TTY_PUT_DELAY (HZ / 100) |
63 | |
64 | static atomic_t num_channels_need_poll = ATOMIC_INIT(0); |
65 | |
66 | static struct timer_list poll_timer; |
67 | |
68 | static struct tty_driver *channel_driver; |
69 | |
70 | static struct timer_list put_timer; |
71 | static struct task_struct *dashtty_thread; |
72 | |
73 | #define RX_BUF_SIZE 1024 |
74 | |
75 | enum { |
76 | INCHR = 1, |
77 | OUTCHR, |
78 | RDBUF, |
79 | WRBUF, |
80 | RDSTAT |
81 | }; |
82 | |
83 | /** |
84 | * struct dashtty_port - Wrapper struct for dashtty tty_port. |
85 | * @port: TTY port data |
86 | * @rx_lock: Lock for rx_buf. |
87 | * This protects between the poll timer and user context. |
88 | * It's also held during read SWITCH operations. |
89 | * @rx_buf: Read buffer |
90 | * @xmit_lock: Lock for xmit_*, and port.xmit_buf. |
91 | * This protects between user context and kernel thread. |
92 | * It's also held during write SWITCH operations. |
93 | * @xmit_cnt: Size of xmit buffer contents |
94 | * @xmit_head: Head of xmit buffer where data is written |
95 | * @xmit_tail: Tail of xmit buffer where data is read |
96 | * @xmit_empty: Completion for xmit buffer being empty |
97 | */ |
98 | struct dashtty_port { |
99 | struct tty_port port; |
100 | spinlock_t rx_lock; |
101 | void *rx_buf; |
102 | struct mutex xmit_lock; |
103 | unsigned int xmit_cnt; |
104 | unsigned int xmit_head; |
105 | unsigned int xmit_tail; |
106 | struct completion xmit_empty; |
107 | }; |
108 | |
109 | static struct dashtty_port dashtty_ports[NUM_TTY_CHANNELS]; |
110 | |
111 | static atomic_t dashtty_xmit_cnt = ATOMIC_INIT(0); |
112 | static wait_queue_head_t dashtty_waitqueue; |
113 | |
114 | /* |
115 | * Low-level DA channel access routines |
116 | */ |
117 | static int chancall(int in_bios_function, int in_channel, |
118 | int in_arg2, void *in_arg3, |
119 | void *in_arg4) |
120 | { |
121 | register int bios_function asm("D1Ar1") = in_bios_function; |
122 | register int channel asm("D0Ar2") = in_channel; |
123 | register int arg2 asm("D1Ar3") = in_arg2; |
124 | register void *arg3 asm("D0Ar4") = in_arg3; |
125 | register void *arg4 asm("D1Ar5") = in_arg4; |
126 | register int bios_call asm("D0Ar6") = 3; |
127 | register int result asm("D0Re0"); |
128 | |
129 | asm volatile ( |
130 | "MSETL [A0StP++], %6,%4,%2\n\t" |
131 | "ADD A0StP, A0StP, #8\n\t" |
132 | "SWITCH #0x0C30208\n\t" |
133 | "GETD %0, [A0StP+#-8]\n\t" |
134 | "SUB A0StP, A0StP, #(4*6)+8\n\t" |
135 | : "=d" (result) /* outs */ |
136 | : "d" (bios_function), |
137 | "d" (channel), |
138 | "d" (arg2), |
139 | "d" (arg3), |
140 | "d" (arg4), |
141 | "d" (bios_call) /* ins */ |
142 | : "memory"); |
143 | |
144 | return result; |
145 | } |
146 | |
147 | /* |
148 | * Attempts to fetch count bytes from channel and returns actual count. |
149 | */ |
150 | static int fetch_data(unsigned int channel) |
151 | { |
152 | struct dashtty_port *dport = &dashtty_ports[channel]; |
153 | int received = 0; |
154 | |
155 | spin_lock_bh(&dport->rx_lock); |
156 | /* check the port isn't being shut down */ |
157 | if (!dport->rx_buf) |
158 | goto unlock; |
159 | if (chancall(RDBUF, channel, RX_BUF_SIZE, |
160 | (void *)dport->rx_buf, &received) == CONAOK) { |
161 | if (received) { |
162 | int space; |
163 | unsigned char *cbuf; |
164 | |
165 | space = tty_prepare_flip_string(&dport->port, &cbuf, |
166 | received); |
167 | |
168 | if (space <= 0) |
169 | goto unlock; |
170 | |
171 | memcpy(cbuf, dport->rx_buf, space); |
172 | tty_flip_buffer_push(&dport->port); |
173 | } |
174 | } |
175 | unlock: |
176 | spin_unlock_bh(&dport->rx_lock); |
177 | |
178 | return received; |
179 | } |
180 | |
181 | /** |
182 | * find_channel_to_poll() - Returns number of the next channel to poll. |
183 | * Returns: The number of the next channel to poll, or -1 if none need |
184 | * polling. |
185 | */ |
186 | static int find_channel_to_poll(void) |
187 | { |
188 | static int last_polled_channel; |
189 | int last = last_polled_channel; |
190 | int chan; |
191 | struct dashtty_port *dport; |
192 | |
193 | for (chan = last + 1; ; ++chan) { |
194 | if (chan >= NUM_TTY_CHANNELS) |
195 | chan = 0; |
196 | |
197 | dport = &dashtty_ports[chan]; |
198 | if (dport->rx_buf) { |
199 | last_polled_channel = chan; |
200 | return chan; |
201 | } |
202 | |
203 | if (chan == last) |
204 | break; |
205 | } |
206 | return -1; |
207 | } |
208 | |
209 | /** |
210 | * put_channel_data() - Write out a block of channel data. |
211 | * @chan: DA channel number. |
212 | * |
213 | * Write a single block of data out to the debug adapter. If the circular buffer |
214 | * is wrapped then only the first block is written. |
215 | * |
216 | * Returns: 1 if the remote buffer was too full to accept data. |
217 | * 0 otherwise. |
218 | */ |
219 | static int put_channel_data(unsigned int chan) |
220 | { |
221 | struct dashtty_port *dport; |
222 | struct tty_struct *tty; |
223 | int number_written; |
224 | unsigned int count = 0; |
225 | |
226 | dport = &dashtty_ports[chan]; |
227 | mutex_lock(&dport->xmit_lock); |
228 | if (dport->xmit_cnt) { |
229 | count = min((unsigned int)(SERIAL_XMIT_SIZE - dport->xmit_tail), |
230 | dport->xmit_cnt); |
231 | chancall(WRBUF, chan, count, |
232 | dport->port.xmit_buf + dport->xmit_tail, |
233 | &number_written); |
234 | dport->xmit_cnt -= number_written; |
235 | if (!dport->xmit_cnt) { |
236 | /* reset pointers to avoid wraps */ |
237 | dport->xmit_head = 0; |
238 | dport->xmit_tail = 0; |
239 | complete(&dport->xmit_empty); |
240 | } else { |
241 | dport->xmit_tail += number_written; |
242 | if (dport->xmit_tail >= SERIAL_XMIT_SIZE) |
243 | dport->xmit_tail -= SERIAL_XMIT_SIZE; |
244 | } |
245 | atomic_sub(number_written, &dashtty_xmit_cnt); |
246 | } |
247 | mutex_unlock(&dport->xmit_lock); |
248 | |
249 | /* if we've made more data available, wake up tty */ |
250 | if (count && number_written) { |
251 | tty = tty_port_tty_get(&dport->port); |
252 | if (tty) { |
253 | tty_wakeup(tty); |
254 | tty_kref_put(tty); |
255 | } |
256 | } |
257 | |
258 | /* did the write fail? */ |
259 | return count && !number_written; |
260 | } |
261 | |
262 | /** |
263 | * put_data() - Kernel thread to write out blocks of channel data to DA. |
264 | * @arg: Unused. |
265 | * |
266 | * This kernel thread runs while @dashtty_xmit_cnt != 0, and loops over the |
267 | * channels to write out any buffered data. If any of the channels stall due to |
268 | * the remote buffer being full, a hold off happens to allow the debugger to |
269 | * drain the buffer. |
270 | */ |
271 | static int put_data(void *arg) |
272 | { |
273 | unsigned int chan, stall; |
274 | |
275 | __set_current_state(TASK_RUNNING); |
276 | while (!kthread_should_stop()) { |
277 | /* |
278 | * For each channel see if there's anything to transmit in the |
279 | * port's xmit_buf. |
280 | */ |
281 | stall = 0; |
282 | for (chan = 0; chan < NUM_TTY_CHANNELS; ++chan) |
283 | stall += put_channel_data(chan); |
284 | |
285 | /* |
286 | * If some of the buffers are full, hold off for a short while |
287 | * to allow them to empty. |
288 | */ |
289 | if (stall) |
290 | msleep(25); |
291 | |
292 | wait_event_interruptible(dashtty_waitqueue, |
293 | atomic_read(&dashtty_xmit_cnt)); |
294 | } |
295 | |
296 | return 0; |
297 | } |
298 | |
299 | /* |
300 | * This gets called every DA_TTY_POLL and polls the channels for data |
301 | */ |
302 | static void dashtty_timer(unsigned long ignored) |
303 | { |
304 | int channel; |
305 | |
306 | /* If there are no ports open do nothing and don't poll again. */ |
307 | if (!atomic_read(&num_channels_need_poll)) |
308 | return; |
309 | |
310 | channel = find_channel_to_poll(); |
311 | |
312 | /* Did we find a channel to poll? */ |
313 | if (channel >= 0) |
314 | fetch_data(channel); |
315 | |
316 | mod_timer_pinned(&poll_timer, jiffies + DA_TTY_POLL); |
317 | } |
318 | |
319 | static void add_poll_timer(struct timer_list *poll_timer) |
320 | { |
321 | setup_timer(poll_timer, dashtty_timer, 0); |
322 | poll_timer->expires = jiffies + DA_TTY_POLL; |
323 | |
324 | /* |
325 | * Always attach the timer to the boot CPU. The DA channels are per-CPU |
326 | * so all polling should be from a single CPU. |
327 | */ |
328 | add_timer_on(poll_timer, 0); |
329 | } |
330 | |
331 | static int dashtty_port_activate(struct tty_port *port, struct tty_struct *tty) |
332 | { |
333 | struct dashtty_port *dport = container_of(port, struct dashtty_port, |
334 | port); |
335 | void *rx_buf; |
336 | |
337 | /* Allocate the buffer we use for writing data */ |
338 | if (tty_port_alloc_xmit_buf(port) < 0) |
339 | goto err; |
340 | |
341 | /* Allocate the buffer we use for reading data */ |
342 | rx_buf = kzalloc(RX_BUF_SIZE, GFP_KERNEL); |
343 | if (!rx_buf) |
344 | goto err_free_xmit; |
345 | |
346 | spin_lock_bh(&dport->rx_lock); |
347 | dport->rx_buf = rx_buf; |
348 | spin_unlock_bh(&dport->rx_lock); |
349 | |
350 | /* |
351 | * Don't add the poll timer if we're opening a console. This |
352 | * avoids the overhead of polling the Dash but means it is not |
353 | * possible to have a login on /dev/console. |
354 | * |
355 | */ |
356 | if (dport != &dashtty_ports[CONSOLE_CHANNEL]) |
357 | if (atomic_inc_return(&num_channels_need_poll) == 1) |
358 | add_poll_timer(&poll_timer); |
359 | |
360 | return 0; |
361 | err_free_xmit: |
362 | tty_port_free_xmit_buf(port); |
363 | err: |
364 | return -ENOMEM; |
365 | } |
366 | |
367 | static void dashtty_port_shutdown(struct tty_port *port) |
368 | { |
369 | struct dashtty_port *dport = container_of(port, struct dashtty_port, |
370 | port); |
371 | void *rx_buf; |
372 | unsigned int count; |
373 | |
374 | /* stop reading */ |
375 | if (dport != &dashtty_ports[CONSOLE_CHANNEL]) |
376 | if (atomic_dec_and_test(&num_channels_need_poll)) |
377 | del_timer_sync(&poll_timer); |
378 | |
379 | mutex_lock(&dport->xmit_lock); |
380 | count = dport->xmit_cnt; |
381 | mutex_unlock(&dport->xmit_lock); |
382 | if (count) { |
383 | /* |
384 | * There's still data to write out, so wake and wait for the |
385 | * writer thread to drain the buffer. |
386 | */ |
387 | del_timer(&put_timer); |
388 | wake_up_interruptible(&dashtty_waitqueue); |
389 | wait_for_completion(&dport->xmit_empty); |
390 | } |
391 | |
392 | /* Null the read buffer (timer could still be running!) */ |
393 | spin_lock_bh(&dport->rx_lock); |
394 | rx_buf = dport->rx_buf; |
395 | dport->rx_buf = NULL; |
396 | spin_unlock_bh(&dport->rx_lock); |
397 | /* Free the read buffer */ |
398 | kfree(rx_buf); |
399 | |
400 | /* Free the write buffer */ |
401 | tty_port_free_xmit_buf(port); |
402 | } |
403 | |
404 | static const struct tty_port_operations dashtty_port_ops = { |
405 | .activate = dashtty_port_activate, |
406 | .shutdown = dashtty_port_shutdown, |
407 | }; |
408 | |
409 | static int dashtty_install(struct tty_driver *driver, struct tty_struct *tty) |
410 | { |
411 | return tty_port_install(&dashtty_ports[tty->index].port, driver, tty); |
412 | } |
413 | |
414 | static int dashtty_open(struct tty_struct *tty, struct file *filp) |
415 | { |
416 | return tty_port_open(tty->port, tty, filp); |
417 | } |
418 | |
419 | static void dashtty_close(struct tty_struct *tty, struct file *filp) |
420 | { |
421 | return tty_port_close(tty->port, tty, filp); |
422 | } |
423 | |
424 | static void dashtty_hangup(struct tty_struct *tty) |
425 | { |
426 | int channel; |
427 | struct dashtty_port *dport; |
428 | |
429 | channel = tty->index; |
430 | dport = &dashtty_ports[channel]; |
431 | |
432 | /* drop any data in the xmit buffer */ |
433 | mutex_lock(&dport->xmit_lock); |
434 | if (dport->xmit_cnt) { |
435 | atomic_sub(dport->xmit_cnt, &dashtty_xmit_cnt); |
436 | dport->xmit_cnt = 0; |
437 | dport->xmit_head = 0; |
438 | dport->xmit_tail = 0; |
439 | complete(&dport->xmit_empty); |
440 | } |
441 | mutex_unlock(&dport->xmit_lock); |
442 | |
443 | tty_port_hangup(tty->port); |
444 | } |
445 | |
446 | /** |
447 | * dashtty_put_timer() - Delayed wake up of kernel thread. |
448 | * @ignored: unused |
449 | * |
450 | * This timer function wakes up the kernel thread if any data exists in the |
451 | * buffers. It is used to delay the expensive writeout until the writer has |
452 | * stopped writing. |
453 | */ |
454 | static void dashtty_put_timer(unsigned long ignored) |
455 | { |
456 | if (atomic_read(&dashtty_xmit_cnt)) |
457 | wake_up_interruptible(&dashtty_waitqueue); |
458 | } |
459 | |
460 | static int dashtty_write(struct tty_struct *tty, const unsigned char *buf, |
461 | int total) |
462 | { |
463 | int channel, count, block; |
464 | struct dashtty_port *dport; |
465 | |
466 | /* Determine the channel */ |
467 | channel = tty->index; |
468 | dport = &dashtty_ports[channel]; |
469 | |
470 | /* |
471 | * Write to output buffer. |
472 | * |
473 | * The reason that we asynchronously write the buffer is because if we |
474 | * were to write the buffer synchronously then because DA channels are |
475 | * per-CPU the buffer would be written to the channel of whatever CPU |
476 | * we're running on. |
477 | * |
478 | * What we actually want to happen is have all input and output done on |
479 | * one CPU. |
480 | */ |
481 | mutex_lock(&dport->xmit_lock); |
482 | /* work out how many bytes we can write to the xmit buffer */ |
483 | total = min(total, (int)(SERIAL_XMIT_SIZE - dport->xmit_cnt)); |
484 | atomic_add(total, &dashtty_xmit_cnt); |
485 | dport->xmit_cnt += total; |
486 | /* write the actual bytes (may need splitting if it wraps) */ |
487 | for (count = total; count; count -= block) { |
488 | block = min(count, (int)(SERIAL_XMIT_SIZE - dport->xmit_head)); |
489 | memcpy(dport->port.xmit_buf + dport->xmit_head, buf, block); |
490 | dport->xmit_head += block; |
491 | if (dport->xmit_head >= SERIAL_XMIT_SIZE) |
492 | dport->xmit_head -= SERIAL_XMIT_SIZE; |
493 | buf += block; |
494 | } |
495 | count = dport->xmit_cnt; |
496 | /* xmit buffer no longer empty? */ |
497 | if (count) |
498 | INIT_COMPLETION(dport->xmit_empty); |
499 | mutex_unlock(&dport->xmit_lock); |
500 | |
501 | if (total) { |
502 | /* |
503 | * If the buffer is full, wake up the kthread, otherwise allow |
504 | * some more time for the buffer to fill up a bit before waking |
505 | * it. |
506 | */ |
507 | if (count == SERIAL_XMIT_SIZE) { |
508 | del_timer(&put_timer); |
509 | wake_up_interruptible(&dashtty_waitqueue); |
510 | } else { |
511 | mod_timer(&put_timer, jiffies + DA_TTY_PUT_DELAY); |
512 | } |
513 | } |
514 | return total; |
515 | } |
516 | |
517 | static int dashtty_write_room(struct tty_struct *tty) |
518 | { |
519 | struct dashtty_port *dport; |
520 | int channel; |
521 | int room; |
522 | |
523 | channel = tty->index; |
524 | dport = &dashtty_ports[channel]; |
525 | |
526 | /* report the space in the xmit buffer */ |
527 | mutex_lock(&dport->xmit_lock); |
528 | room = SERIAL_XMIT_SIZE - dport->xmit_cnt; |
529 | mutex_unlock(&dport->xmit_lock); |
530 | |
531 | return room; |
532 | } |
533 | |
534 | static int dashtty_chars_in_buffer(struct tty_struct *tty) |
535 | { |
536 | struct dashtty_port *dport; |
537 | int channel; |
538 | int chars; |
539 | |
540 | channel = tty->index; |
541 | dport = &dashtty_ports[channel]; |
542 | |
543 | /* report the number of bytes in the xmit buffer */ |
544 | mutex_lock(&dport->xmit_lock); |
545 | chars = dport->xmit_cnt; |
546 | mutex_unlock(&dport->xmit_lock); |
547 | |
548 | return chars; |
549 | } |
550 | |
551 | static const struct tty_operations dashtty_ops = { |
552 | .install = dashtty_install, |
553 | .open = dashtty_open, |
554 | .close = dashtty_close, |
555 | .hangup = dashtty_hangup, |
556 | .write = dashtty_write, |
557 | .write_room = dashtty_write_room, |
558 | .chars_in_buffer = dashtty_chars_in_buffer, |
559 | }; |
560 | |
561 | static int __init dashtty_init(void) |
562 | { |
563 | int ret; |
564 | int nport; |
565 | struct dashtty_port *dport; |
566 | |
567 | if (!metag_da_enabled()) |
568 | return -ENODEV; |
569 | |
570 | channel_driver = tty_alloc_driver(NUM_TTY_CHANNELS, |
571 | TTY_DRIVER_REAL_RAW); |
572 | if (IS_ERR(channel_driver)) |
573 | return PTR_ERR(channel_driver); |
574 | |
575 | channel_driver->driver_name = "metag_da"; |
576 | channel_driver->name = "ttyDA"; |
577 | channel_driver->major = DA_TTY_MAJOR; |
578 | channel_driver->minor_start = 0; |
579 | channel_driver->type = TTY_DRIVER_TYPE_SERIAL; |
580 | channel_driver->subtype = SERIAL_TYPE_NORMAL; |
581 | channel_driver->init_termios = tty_std_termios; |
582 | channel_driver->init_termios.c_cflag |= CLOCAL; |
583 | |
584 | tty_set_operations(channel_driver, &dashtty_ops); |
585 | for (nport = 0; nport < NUM_TTY_CHANNELS; nport++) { |
586 | dport = &dashtty_ports[nport]; |
587 | tty_port_init(&dport->port); |
588 | dport->port.ops = &dashtty_port_ops; |
589 | spin_lock_init(&dport->rx_lock); |
590 | mutex_init(&dport->xmit_lock); |
591 | /* the xmit buffer starts empty, i.e. completely written */ |
592 | init_completion(&dport->xmit_empty); |
593 | complete(&dport->xmit_empty); |
594 | } |
595 | |
596 | setup_timer(&put_timer, dashtty_put_timer, 0); |
597 | |
598 | init_waitqueue_head(&dashtty_waitqueue); |
599 | dashtty_thread = kthread_create(put_data, NULL, "ttyDA"); |
600 | if (IS_ERR(dashtty_thread)) { |
601 | pr_err("Couldn't create dashtty thread\n"); |
602 | ret = PTR_ERR(dashtty_thread); |
603 | goto err_destroy_ports; |
604 | } |
605 | /* |
606 | * Bind the writer thread to the boot CPU so it can't migrate. |
607 | * DA channels are per-CPU and we want all channel I/O to be on a single |
608 | * predictable CPU. |
609 | */ |
610 | kthread_bind(dashtty_thread, 0); |
611 | wake_up_process(dashtty_thread); |
612 | |
613 | ret = tty_register_driver(channel_driver); |
614 | |
615 | if (ret < 0) { |
616 | pr_err("Couldn't install dashtty driver: err %d\n", |
617 | ret); |
618 | goto err_stop_kthread; |
619 | } |
620 | |
621 | return 0; |
622 | |
623 | err_stop_kthread: |
624 | kthread_stop(dashtty_thread); |
625 | err_destroy_ports: |
626 | for (nport = 0; nport < NUM_TTY_CHANNELS; nport++) { |
627 | dport = &dashtty_ports[nport]; |
628 | tty_port_destroy(&dport->port); |
629 | } |
630 | put_tty_driver(channel_driver); |
631 | return ret; |
632 | } |
633 | |
634 | static void dashtty_exit(void) |
635 | { |
636 | int nport; |
637 | struct dashtty_port *dport; |
638 | |
639 | del_timer_sync(&put_timer); |
640 | kthread_stop(dashtty_thread); |
641 | del_timer_sync(&poll_timer); |
642 | tty_unregister_driver(channel_driver); |
643 | for (nport = 0; nport < NUM_TTY_CHANNELS; nport++) { |
644 | dport = &dashtty_ports[nport]; |
645 | tty_port_destroy(&dport->port); |
646 | } |
647 | put_tty_driver(channel_driver); |
648 | } |
649 | |
650 | module_init(dashtty_init); |
651 | module_exit(dashtty_exit); |
652 | |
653 | #ifdef CONFIG_DA_CONSOLE |
654 | |
655 | static void dash_console_write(struct console *co, const char *s, |
656 | unsigned int count) |
657 | { |
658 | int actually_written; |
659 | |
660 | chancall(WRBUF, CONSOLE_CHANNEL, count, (void *)s, &actually_written); |
661 | } |
662 | |
663 | static struct tty_driver *dash_console_device(struct console *c, int *index) |
664 | { |
665 | *index = c->index; |
666 | return channel_driver; |
667 | } |
668 | |
669 | struct console dash_console = { |
670 | .name = "ttyDA", |
671 | .write = dash_console_write, |
672 | .device = dash_console_device, |
673 | .flags = CON_PRINTBUFFER, |
674 | .index = 1, |
675 | }; |
676 | |
677 | #endif |
678 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9