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1 | /* |
2 | * linux/drivers/char/core.c |
3 | * |
4 | * Driver core for serial ports |
5 | * |
6 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
7 | * |
8 | * Copyright 1999 ARM Limited |
9 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License as published by |
13 | * the Free Software Foundation; either version 2 of the License, or |
14 | * (at your option) any later version. |
15 | * |
16 | * This program is distributed in the hope that it will be useful, |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
19 | * GNU General Public License for more details. |
20 | * |
21 | * You should have received a copy of the GNU General Public License |
22 | * along with this program; if not, write to the Free Software |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
24 | */ |
25 | #include <linux/module.h> |
26 | #include <linux/tty.h> |
27 | #include <linux/slab.h> |
28 | #include <linux/init.h> |
29 | #include <linux/console.h> |
30 | #include <linux/proc_fs.h> |
31 | #include <linux/seq_file.h> |
32 | #include <linux/smp_lock.h> |
33 | #include <linux/device.h> |
34 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ |
35 | #include <linux/serial_core.h> |
36 | #include <linux/delay.h> |
37 | #include <linux/mutex.h> |
38 | |
39 | #include <asm/irq.h> |
40 | #include <asm/uaccess.h> |
41 | |
42 | /* |
43 | * This is used to lock changes in serial line configuration. |
44 | */ |
45 | static DEFINE_MUTEX(port_mutex); |
46 | |
47 | /* |
48 | * lockdep: port->lock is initialized in two places, but we |
49 | * want only one lock-class: |
50 | */ |
51 | static struct lock_class_key port_lock_key; |
52 | |
53 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
54 | |
55 | #ifdef CONFIG_SERIAL_CORE_CONSOLE |
56 | #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) |
57 | #else |
58 | #define uart_console(port) (0) |
59 | #endif |
60 | |
61 | static void uart_change_speed(struct uart_state *state, |
62 | struct ktermios *old_termios); |
63 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
64 | static void uart_change_pm(struct uart_state *state, int pm_state); |
65 | |
66 | /* |
67 | * This routine is used by the interrupt handler to schedule processing in |
68 | * the software interrupt portion of the driver. |
69 | */ |
70 | void uart_write_wakeup(struct uart_port *port) |
71 | { |
72 | struct uart_state *state = port->state; |
73 | /* |
74 | * This means you called this function _after_ the port was |
75 | * closed. No cookie for you. |
76 | */ |
77 | BUG_ON(!state); |
78 | tasklet_schedule(&state->tlet); |
79 | } |
80 | |
81 | static void uart_stop(struct tty_struct *tty) |
82 | { |
83 | struct uart_state *state = tty->driver_data; |
84 | struct uart_port *port = state->uart_port; |
85 | unsigned long flags; |
86 | |
87 | spin_lock_irqsave(&port->lock, flags); |
88 | port->ops->stop_tx(port); |
89 | spin_unlock_irqrestore(&port->lock, flags); |
90 | } |
91 | |
92 | static void __uart_start(struct tty_struct *tty) |
93 | { |
94 | struct uart_state *state = tty->driver_data; |
95 | struct uart_port *port = state->uart_port; |
96 | |
97 | if (!uart_circ_empty(&state->xmit) && state->xmit.buf && |
98 | !tty->stopped && !tty->hw_stopped) |
99 | port->ops->start_tx(port); |
100 | } |
101 | |
102 | static void uart_start(struct tty_struct *tty) |
103 | { |
104 | struct uart_state *state = tty->driver_data; |
105 | struct uart_port *port = state->uart_port; |
106 | unsigned long flags; |
107 | |
108 | spin_lock_irqsave(&port->lock, flags); |
109 | __uart_start(tty); |
110 | spin_unlock_irqrestore(&port->lock, flags); |
111 | } |
112 | |
113 | static void uart_tasklet_action(unsigned long data) |
114 | { |
115 | struct uart_state *state = (struct uart_state *)data; |
116 | tty_wakeup(state->port.tty); |
117 | } |
118 | |
119 | static inline void |
120 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) |
121 | { |
122 | unsigned long flags; |
123 | unsigned int old; |
124 | |
125 | spin_lock_irqsave(&port->lock, flags); |
126 | old = port->mctrl; |
127 | port->mctrl = (old & ~clear) | set; |
128 | if (old != port->mctrl) |
129 | port->ops->set_mctrl(port, port->mctrl); |
130 | spin_unlock_irqrestore(&port->lock, flags); |
131 | } |
132 | |
133 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
134 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) |
135 | |
136 | /* |
137 | * Startup the port. This will be called once per open. All calls |
138 | * will be serialised by the per-port mutex. |
139 | */ |
140 | static int uart_startup(struct uart_state *state, int init_hw) |
141 | { |
142 | struct uart_port *uport = state->uart_port; |
143 | struct tty_port *port = &state->port; |
144 | unsigned long page; |
145 | int retval = 0; |
146 | |
147 | if (port->flags & ASYNC_INITIALIZED) |
148 | return 0; |
149 | |
150 | /* |
151 | * Set the TTY IO error marker - we will only clear this |
152 | * once we have successfully opened the port. Also set |
153 | * up the tty->alt_speed kludge |
154 | */ |
155 | set_bit(TTY_IO_ERROR, &port->tty->flags); |
156 | |
157 | if (uport->type == PORT_UNKNOWN) |
158 | return 0; |
159 | |
160 | /* |
161 | * Initialise and allocate the transmit and temporary |
162 | * buffer. |
163 | */ |
164 | if (!state->xmit.buf) { |
165 | /* This is protected by the per port mutex */ |
166 | page = get_zeroed_page(GFP_KERNEL); |
167 | if (!page) |
168 | return -ENOMEM; |
169 | |
170 | state->xmit.buf = (unsigned char *) page; |
171 | uart_circ_clear(&state->xmit); |
172 | } |
173 | |
174 | retval = uport->ops->startup(uport); |
175 | if (retval == 0) { |
176 | if (init_hw) { |
177 | /* |
178 | * Initialise the hardware port settings. |
179 | */ |
180 | uart_change_speed(state, NULL); |
181 | |
182 | /* |
183 | * Setup the RTS and DTR signals once the |
184 | * port is open and ready to respond. |
185 | */ |
186 | if (port->tty->termios->c_cflag & CBAUD) |
187 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
188 | } |
189 | |
190 | if (port->flags & ASYNC_CTS_FLOW) { |
191 | spin_lock_irq(&uport->lock); |
192 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) |
193 | port->tty->hw_stopped = 1; |
194 | spin_unlock_irq(&uport->lock); |
195 | } |
196 | |
197 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
198 | |
199 | clear_bit(TTY_IO_ERROR, &port->tty->flags); |
200 | } |
201 | |
202 | if (retval && capable(CAP_SYS_ADMIN)) |
203 | retval = 0; |
204 | |
205 | return retval; |
206 | } |
207 | |
208 | /* |
209 | * This routine will shutdown a serial port; interrupts are disabled, and |
210 | * DTR is dropped if the hangup on close termio flag is on. Calls to |
211 | * uart_shutdown are serialised by the per-port semaphore. |
212 | */ |
213 | static void uart_shutdown(struct uart_state *state) |
214 | { |
215 | struct uart_port *uport = state->uart_port; |
216 | struct tty_port *port = &state->port; |
217 | struct tty_struct *tty = port->tty; |
218 | |
219 | /* |
220 | * Set the TTY IO error marker |
221 | */ |
222 | if (tty) |
223 | set_bit(TTY_IO_ERROR, &tty->flags); |
224 | |
225 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
226 | /* |
227 | * Turn off DTR and RTS early. |
228 | */ |
229 | if (!tty || (tty->termios->c_cflag & HUPCL)) |
230 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
231 | |
232 | /* |
233 | * clear delta_msr_wait queue to avoid mem leaks: we may free |
234 | * the irq here so the queue might never be woken up. Note |
235 | * that we won't end up waiting on delta_msr_wait again since |
236 | * any outstanding file descriptors should be pointing at |
237 | * hung_up_tty_fops now. |
238 | */ |
239 | wake_up_interruptible(&port->delta_msr_wait); |
240 | |
241 | /* |
242 | * Free the IRQ and disable the port. |
243 | */ |
244 | uport->ops->shutdown(uport); |
245 | |
246 | /* |
247 | * Ensure that the IRQ handler isn't running on another CPU. |
248 | */ |
249 | synchronize_irq(uport->irq); |
250 | } |
251 | |
252 | /* |
253 | * kill off our tasklet |
254 | */ |
255 | tasklet_kill(&state->tlet); |
256 | |
257 | /* |
258 | * Free the transmit buffer page. |
259 | */ |
260 | if (state->xmit.buf) { |
261 | free_page((unsigned long)state->xmit.buf); |
262 | state->xmit.buf = NULL; |
263 | } |
264 | } |
265 | |
266 | /** |
267 | * uart_update_timeout - update per-port FIFO timeout. |
268 | * @port: uart_port structure describing the port |
269 | * @cflag: termios cflag value |
270 | * @baud: speed of the port |
271 | * |
272 | * Set the port FIFO timeout value. The @cflag value should |
273 | * reflect the actual hardware settings. |
274 | */ |
275 | void |
276 | uart_update_timeout(struct uart_port *port, unsigned int cflag, |
277 | unsigned int baud) |
278 | { |
279 | unsigned int bits; |
280 | |
281 | /* byte size and parity */ |
282 | switch (cflag & CSIZE) { |
283 | case CS5: |
284 | bits = 7; |
285 | break; |
286 | case CS6: |
287 | bits = 8; |
288 | break; |
289 | case CS7: |
290 | bits = 9; |
291 | break; |
292 | default: |
293 | bits = 10; |
294 | break; /* CS8 */ |
295 | } |
296 | |
297 | if (cflag & CSTOPB) |
298 | bits++; |
299 | if (cflag & PARENB) |
300 | bits++; |
301 | |
302 | /* |
303 | * The total number of bits to be transmitted in the fifo. |
304 | */ |
305 | bits = bits * port->fifosize; |
306 | |
307 | /* |
308 | * Figure the timeout to send the above number of bits. |
309 | * Add .02 seconds of slop |
310 | */ |
311 | port->timeout = (HZ * bits) / baud + HZ/50; |
312 | } |
313 | |
314 | EXPORT_SYMBOL(uart_update_timeout); |
315 | |
316 | /** |
317 | * uart_get_baud_rate - return baud rate for a particular port |
318 | * @port: uart_port structure describing the port in question. |
319 | * @termios: desired termios settings. |
320 | * @old: old termios (or NULL) |
321 | * @min: minimum acceptable baud rate |
322 | * @max: maximum acceptable baud rate |
323 | * |
324 | * Decode the termios structure into a numeric baud rate, |
325 | * taking account of the magic 38400 baud rate (with spd_* |
326 | * flags), and mapping the %B0 rate to 9600 baud. |
327 | * |
328 | * If the new baud rate is invalid, try the old termios setting. |
329 | * If it's still invalid, we try 9600 baud. |
330 | * |
331 | * Update the @termios structure to reflect the baud rate |
332 | * we're actually going to be using. Don't do this for the case |
333 | * where B0 is requested ("hang up"). |
334 | */ |
335 | unsigned int |
336 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
337 | struct ktermios *old, unsigned int min, unsigned int max) |
338 | { |
339 | unsigned int try, baud, altbaud = 38400; |
340 | int hung_up = 0; |
341 | upf_t flags = port->flags & UPF_SPD_MASK; |
342 | |
343 | if (flags == UPF_SPD_HI) |
344 | altbaud = 57600; |
345 | else if (flags == UPF_SPD_VHI) |
346 | altbaud = 115200; |
347 | else if (flags == UPF_SPD_SHI) |
348 | altbaud = 230400; |
349 | else if (flags == UPF_SPD_WARP) |
350 | altbaud = 460800; |
351 | |
352 | for (try = 0; try < 2; try++) { |
353 | baud = tty_termios_baud_rate(termios); |
354 | |
355 | /* |
356 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... |
357 | * Die! Die! Die! |
358 | */ |
359 | if (baud == 38400) |
360 | baud = altbaud; |
361 | |
362 | /* |
363 | * Special case: B0 rate. |
364 | */ |
365 | if (baud == 0) { |
366 | hung_up = 1; |
367 | baud = 9600; |
368 | } |
369 | |
370 | if (baud >= min && baud <= max) |
371 | return baud; |
372 | |
373 | /* |
374 | * Oops, the quotient was zero. Try again with |
375 | * the old baud rate if possible. |
376 | */ |
377 | termios->c_cflag &= ~CBAUD; |
378 | if (old) { |
379 | baud = tty_termios_baud_rate(old); |
380 | if (!hung_up) |
381 | tty_termios_encode_baud_rate(termios, |
382 | baud, baud); |
383 | old = NULL; |
384 | continue; |
385 | } |
386 | |
387 | /* |
388 | * As a last resort, if the range cannot be met then clip to |
389 | * the nearest chip supported rate. |
390 | */ |
391 | if (!hung_up) { |
392 | if (baud <= min) |
393 | tty_termios_encode_baud_rate(termios, |
394 | min + 1, min + 1); |
395 | else |
396 | tty_termios_encode_baud_rate(termios, |
397 | max - 1, max - 1); |
398 | } |
399 | } |
400 | /* Should never happen */ |
401 | WARN_ON(1); |
402 | return 0; |
403 | } |
404 | |
405 | EXPORT_SYMBOL(uart_get_baud_rate); |
406 | |
407 | /** |
408 | * uart_get_divisor - return uart clock divisor |
409 | * @port: uart_port structure describing the port. |
410 | * @baud: desired baud rate |
411 | * |
412 | * Calculate the uart clock divisor for the port. |
413 | */ |
414 | unsigned int |
415 | uart_get_divisor(struct uart_port *port, unsigned int baud) |
416 | { |
417 | unsigned int quot; |
418 | |
419 | /* |
420 | * Old custom speed handling. |
421 | */ |
422 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) |
423 | quot = port->custom_divisor; |
424 | else |
425 | quot = (port->uartclk + (8 * baud)) / (16 * baud); |
426 | |
427 | return quot; |
428 | } |
429 | |
430 | EXPORT_SYMBOL(uart_get_divisor); |
431 | |
432 | /* FIXME: Consistent locking policy */ |
433 | static void |
434 | uart_change_speed(struct uart_state *state, struct ktermios *old_termios) |
435 | { |
436 | struct tty_port *port = &state->port; |
437 | struct tty_struct *tty = port->tty; |
438 | struct uart_port *uport = state->uart_port; |
439 | struct ktermios *termios; |
440 | |
441 | /* |
442 | * If we have no tty, termios, or the port does not exist, |
443 | * then we can't set the parameters for this port. |
444 | */ |
445 | if (!tty || !tty->termios || uport->type == PORT_UNKNOWN) |
446 | return; |
447 | |
448 | termios = tty->termios; |
449 | |
450 | /* |
451 | * Set flags based on termios cflag |
452 | */ |
453 | if (termios->c_cflag & CRTSCTS) |
454 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
455 | else |
456 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
457 | |
458 | if (termios->c_cflag & CLOCAL) |
459 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
460 | else |
461 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
462 | |
463 | uport->ops->set_termios(uport, termios, old_termios); |
464 | } |
465 | |
466 | static inline int |
467 | __uart_put_char(struct uart_port *port, struct circ_buf *circ, unsigned char c) |
468 | { |
469 | unsigned long flags; |
470 | int ret = 0; |
471 | |
472 | if (!circ->buf) |
473 | return 0; |
474 | |
475 | spin_lock_irqsave(&port->lock, flags); |
476 | if (uart_circ_chars_free(circ) != 0) { |
477 | circ->buf[circ->head] = c; |
478 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); |
479 | ret = 1; |
480 | } |
481 | spin_unlock_irqrestore(&port->lock, flags); |
482 | return ret; |
483 | } |
484 | |
485 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
486 | { |
487 | struct uart_state *state = tty->driver_data; |
488 | |
489 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
490 | } |
491 | |
492 | static void uart_flush_chars(struct tty_struct *tty) |
493 | { |
494 | uart_start(tty); |
495 | } |
496 | |
497 | static int |
498 | uart_write(struct tty_struct *tty, const unsigned char *buf, int count) |
499 | { |
500 | struct uart_state *state = tty->driver_data; |
501 | struct uart_port *port; |
502 | struct circ_buf *circ; |
503 | unsigned long flags; |
504 | int c, ret = 0; |
505 | |
506 | /* |
507 | * This means you called this function _after_ the port was |
508 | * closed. No cookie for you. |
509 | */ |
510 | if (!state) { |
511 | WARN_ON(1); |
512 | return -EL3HLT; |
513 | } |
514 | |
515 | port = state->uart_port; |
516 | circ = &state->xmit; |
517 | |
518 | if (!circ->buf) |
519 | return 0; |
520 | |
521 | spin_lock_irqsave(&port->lock, flags); |
522 | while (1) { |
523 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); |
524 | if (count < c) |
525 | c = count; |
526 | if (c <= 0) |
527 | break; |
528 | memcpy(circ->buf + circ->head, buf, c); |
529 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); |
530 | buf += c; |
531 | count -= c; |
532 | ret += c; |
533 | } |
534 | spin_unlock_irqrestore(&port->lock, flags); |
535 | |
536 | uart_start(tty); |
537 | return ret; |
538 | } |
539 | |
540 | static int uart_write_room(struct tty_struct *tty) |
541 | { |
542 | struct uart_state *state = tty->driver_data; |
543 | unsigned long flags; |
544 | int ret; |
545 | |
546 | spin_lock_irqsave(&state->uart_port->lock, flags); |
547 | ret = uart_circ_chars_free(&state->xmit); |
548 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
549 | return ret; |
550 | } |
551 | |
552 | static int uart_chars_in_buffer(struct tty_struct *tty) |
553 | { |
554 | struct uart_state *state = tty->driver_data; |
555 | unsigned long flags; |
556 | int ret; |
557 | |
558 | spin_lock_irqsave(&state->uart_port->lock, flags); |
559 | ret = uart_circ_chars_pending(&state->xmit); |
560 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
561 | return ret; |
562 | } |
563 | |
564 | static void uart_flush_buffer(struct tty_struct *tty) |
565 | { |
566 | struct uart_state *state = tty->driver_data; |
567 | struct uart_port *port; |
568 | unsigned long flags; |
569 | |
570 | /* |
571 | * This means you called this function _after_ the port was |
572 | * closed. No cookie for you. |
573 | */ |
574 | if (!state) { |
575 | WARN_ON(1); |
576 | return; |
577 | } |
578 | |
579 | port = state->uart_port; |
580 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
581 | |
582 | spin_lock_irqsave(&port->lock, flags); |
583 | uart_circ_clear(&state->xmit); |
584 | if (port->ops->flush_buffer) |
585 | port->ops->flush_buffer(port); |
586 | spin_unlock_irqrestore(&port->lock, flags); |
587 | tty_wakeup(tty); |
588 | } |
589 | |
590 | /* |
591 | * This function is used to send a high-priority XON/XOFF character to |
592 | * the device |
593 | */ |
594 | static void uart_send_xchar(struct tty_struct *tty, char ch) |
595 | { |
596 | struct uart_state *state = tty->driver_data; |
597 | struct uart_port *port = state->uart_port; |
598 | unsigned long flags; |
599 | |
600 | if (port->ops->send_xchar) |
601 | port->ops->send_xchar(port, ch); |
602 | else { |
603 | port->x_char = ch; |
604 | if (ch) { |
605 | spin_lock_irqsave(&port->lock, flags); |
606 | port->ops->start_tx(port); |
607 | spin_unlock_irqrestore(&port->lock, flags); |
608 | } |
609 | } |
610 | } |
611 | |
612 | static void uart_throttle(struct tty_struct *tty) |
613 | { |
614 | struct uart_state *state = tty->driver_data; |
615 | |
616 | if (I_IXOFF(tty)) |
617 | uart_send_xchar(tty, STOP_CHAR(tty)); |
618 | |
619 | if (tty->termios->c_cflag & CRTSCTS) |
620 | uart_clear_mctrl(state->uart_port, TIOCM_RTS); |
621 | } |
622 | |
623 | static void uart_unthrottle(struct tty_struct *tty) |
624 | { |
625 | struct uart_state *state = tty->driver_data; |
626 | struct uart_port *port = state->uart_port; |
627 | |
628 | if (I_IXOFF(tty)) { |
629 | if (port->x_char) |
630 | port->x_char = 0; |
631 | else |
632 | uart_send_xchar(tty, START_CHAR(tty)); |
633 | } |
634 | |
635 | if (tty->termios->c_cflag & CRTSCTS) |
636 | uart_set_mctrl(port, TIOCM_RTS); |
637 | } |
638 | |
639 | static int uart_get_info(struct uart_state *state, |
640 | struct serial_struct __user *retinfo) |
641 | { |
642 | struct uart_port *uport = state->uart_port; |
643 | struct tty_port *port = &state->port; |
644 | struct serial_struct tmp; |
645 | |
646 | memset(&tmp, 0, sizeof(tmp)); |
647 | |
648 | /* Ensure the state we copy is consistent and no hardware changes |
649 | occur as we go */ |
650 | mutex_lock(&port->mutex); |
651 | |
652 | tmp.type = uport->type; |
653 | tmp.line = uport->line; |
654 | tmp.port = uport->iobase; |
655 | if (HIGH_BITS_OFFSET) |
656 | tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
657 | tmp.irq = uport->irq; |
658 | tmp.flags = uport->flags; |
659 | tmp.xmit_fifo_size = uport->fifosize; |
660 | tmp.baud_base = uport->uartclk / 16; |
661 | tmp.close_delay = port->close_delay / 10; |
662 | tmp.closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
663 | ASYNC_CLOSING_WAIT_NONE : |
664 | port->closing_wait / 10; |
665 | tmp.custom_divisor = uport->custom_divisor; |
666 | tmp.hub6 = uport->hub6; |
667 | tmp.io_type = uport->iotype; |
668 | tmp.iomem_reg_shift = uport->regshift; |
669 | tmp.iomem_base = (void *)(unsigned long)uport->mapbase; |
670 | |
671 | mutex_unlock(&port->mutex); |
672 | |
673 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
674 | return -EFAULT; |
675 | return 0; |
676 | } |
677 | |
678 | static int uart_set_info(struct uart_state *state, |
679 | struct serial_struct __user *newinfo) |
680 | { |
681 | struct serial_struct new_serial; |
682 | struct uart_port *uport = state->uart_port; |
683 | struct tty_port *port = &state->port; |
684 | unsigned long new_port; |
685 | unsigned int change_irq, change_port, closing_wait; |
686 | unsigned int old_custom_divisor, close_delay; |
687 | upf_t old_flags, new_flags; |
688 | int retval = 0; |
689 | |
690 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) |
691 | return -EFAULT; |
692 | |
693 | new_port = new_serial.port; |
694 | if (HIGH_BITS_OFFSET) |
695 | new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; |
696 | |
697 | new_serial.irq = irq_canonicalize(new_serial.irq); |
698 | close_delay = new_serial.close_delay * 10; |
699 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
700 | ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; |
701 | |
702 | /* |
703 | * This semaphore protects port->count. It is also |
704 | * very useful to prevent opens. Also, take the |
705 | * port configuration semaphore to make sure that a |
706 | * module insertion/removal doesn't change anything |
707 | * under us. |
708 | */ |
709 | mutex_lock(&port->mutex); |
710 | |
711 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
712 | && new_serial.irq != uport->irq; |
713 | |
714 | /* |
715 | * Since changing the 'type' of the port changes its resource |
716 | * allocations, we should treat type changes the same as |
717 | * IO port changes. |
718 | */ |
719 | change_port = !(uport->flags & UPF_FIXED_PORT) |
720 | && (new_port != uport->iobase || |
721 | (unsigned long)new_serial.iomem_base != uport->mapbase || |
722 | new_serial.hub6 != uport->hub6 || |
723 | new_serial.io_type != uport->iotype || |
724 | new_serial.iomem_reg_shift != uport->regshift || |
725 | new_serial.type != uport->type); |
726 | |
727 | old_flags = uport->flags; |
728 | new_flags = new_serial.flags; |
729 | old_custom_divisor = uport->custom_divisor; |
730 | |
731 | if (!capable(CAP_SYS_ADMIN)) { |
732 | retval = -EPERM; |
733 | if (change_irq || change_port || |
734 | (new_serial.baud_base != uport->uartclk / 16) || |
735 | (close_delay != port->close_delay) || |
736 | (closing_wait != port->closing_wait) || |
737 | (new_serial.xmit_fifo_size && |
738 | new_serial.xmit_fifo_size != uport->fifosize) || |
739 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
740 | goto exit; |
741 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
742 | (new_flags & UPF_USR_MASK)); |
743 | uport->custom_divisor = new_serial.custom_divisor; |
744 | goto check_and_exit; |
745 | } |
746 | |
747 | /* |
748 | * Ask the low level driver to verify the settings. |
749 | */ |
750 | if (uport->ops->verify_port) |
751 | retval = uport->ops->verify_port(uport, &new_serial); |
752 | |
753 | if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || |
754 | (new_serial.baud_base < 9600)) |
755 | retval = -EINVAL; |
756 | |
757 | if (retval) |
758 | goto exit; |
759 | |
760 | if (change_port || change_irq) { |
761 | retval = -EBUSY; |
762 | |
763 | /* |
764 | * Make sure that we are the sole user of this port. |
765 | */ |
766 | if (tty_port_users(port) > 1) |
767 | goto exit; |
768 | |
769 | /* |
770 | * We need to shutdown the serial port at the old |
771 | * port/type/irq combination. |
772 | */ |
773 | uart_shutdown(state); |
774 | } |
775 | |
776 | if (change_port) { |
777 | unsigned long old_iobase, old_mapbase; |
778 | unsigned int old_type, old_iotype, old_hub6, old_shift; |
779 | |
780 | old_iobase = uport->iobase; |
781 | old_mapbase = uport->mapbase; |
782 | old_type = uport->type; |
783 | old_hub6 = uport->hub6; |
784 | old_iotype = uport->iotype; |
785 | old_shift = uport->regshift; |
786 | |
787 | /* |
788 | * Free and release old regions |
789 | */ |
790 | if (old_type != PORT_UNKNOWN) |
791 | uport->ops->release_port(uport); |
792 | |
793 | uport->iobase = new_port; |
794 | uport->type = new_serial.type; |
795 | uport->hub6 = new_serial.hub6; |
796 | uport->iotype = new_serial.io_type; |
797 | uport->regshift = new_serial.iomem_reg_shift; |
798 | uport->mapbase = (unsigned long)new_serial.iomem_base; |
799 | |
800 | /* |
801 | * Claim and map the new regions |
802 | */ |
803 | if (uport->type != PORT_UNKNOWN) { |
804 | retval = uport->ops->request_port(uport); |
805 | } else { |
806 | /* Always success - Jean II */ |
807 | retval = 0; |
808 | } |
809 | |
810 | /* |
811 | * If we fail to request resources for the |
812 | * new port, try to restore the old settings. |
813 | */ |
814 | if (retval && old_type != PORT_UNKNOWN) { |
815 | uport->iobase = old_iobase; |
816 | uport->type = old_type; |
817 | uport->hub6 = old_hub6; |
818 | uport->iotype = old_iotype; |
819 | uport->regshift = old_shift; |
820 | uport->mapbase = old_mapbase; |
821 | retval = uport->ops->request_port(uport); |
822 | /* |
823 | * If we failed to restore the old settings, |
824 | * we fail like this. |
825 | */ |
826 | if (retval) |
827 | uport->type = PORT_UNKNOWN; |
828 | |
829 | /* |
830 | * We failed anyway. |
831 | */ |
832 | retval = -EBUSY; |
833 | /* Added to return the correct error -Ram Gupta */ |
834 | goto exit; |
835 | } |
836 | } |
837 | |
838 | if (change_irq) |
839 | uport->irq = new_serial.irq; |
840 | if (!(uport->flags & UPF_FIXED_PORT)) |
841 | uport->uartclk = new_serial.baud_base * 16; |
842 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
843 | (new_flags & UPF_CHANGE_MASK); |
844 | uport->custom_divisor = new_serial.custom_divisor; |
845 | port->close_delay = close_delay; |
846 | port->closing_wait = closing_wait; |
847 | if (new_serial.xmit_fifo_size) |
848 | uport->fifosize = new_serial.xmit_fifo_size; |
849 | if (port->tty) |
850 | port->tty->low_latency = |
851 | (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
852 | |
853 | check_and_exit: |
854 | retval = 0; |
855 | if (uport->type == PORT_UNKNOWN) |
856 | goto exit; |
857 | if (port->flags & ASYNC_INITIALIZED) { |
858 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
859 | old_custom_divisor != uport->custom_divisor) { |
860 | /* |
861 | * If they're setting up a custom divisor or speed, |
862 | * instead of clearing it, then bitch about it. No |
863 | * need to rate-limit; it's CAP_SYS_ADMIN only. |
864 | */ |
865 | if (uport->flags & UPF_SPD_MASK) { |
866 | char buf[64]; |
867 | printk(KERN_NOTICE |
868 | "%s sets custom speed on %s. This " |
869 | "is deprecated.\n", current->comm, |
870 | tty_name(port->tty, buf)); |
871 | } |
872 | uart_change_speed(state, NULL); |
873 | } |
874 | } else |
875 | retval = uart_startup(state, 1); |
876 | exit: |
877 | mutex_unlock(&port->mutex); |
878 | return retval; |
879 | } |
880 | |
881 | |
882 | /* |
883 | * uart_get_lsr_info - get line status register info. |
884 | * Note: uart_ioctl protects us against hangups. |
885 | */ |
886 | static int uart_get_lsr_info(struct uart_state *state, |
887 | unsigned int __user *value) |
888 | { |
889 | struct uart_port *uport = state->uart_port; |
890 | struct tty_port *port = &state->port; |
891 | unsigned int result; |
892 | |
893 | result = uport->ops->tx_empty(uport); |
894 | |
895 | /* |
896 | * If we're about to load something into the transmit |
897 | * register, we'll pretend the transmitter isn't empty to |
898 | * avoid a race condition (depending on when the transmit |
899 | * interrupt happens). |
900 | */ |
901 | if (uport->x_char || |
902 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
903 | !port->tty->stopped && !port->tty->hw_stopped)) |
904 | result &= ~TIOCSER_TEMT; |
905 | |
906 | return put_user(result, value); |
907 | } |
908 | |
909 | static int uart_tiocmget(struct tty_struct *tty, struct file *file) |
910 | { |
911 | struct uart_state *state = tty->driver_data; |
912 | struct tty_port *port = &state->port; |
913 | struct uart_port *uport = state->uart_port; |
914 | int result = -EIO; |
915 | |
916 | mutex_lock(&port->mutex); |
917 | if ((!file || !tty_hung_up_p(file)) && |
918 | !(tty->flags & (1 << TTY_IO_ERROR))) { |
919 | result = uport->mctrl; |
920 | |
921 | spin_lock_irq(&uport->lock); |
922 | result |= uport->ops->get_mctrl(uport); |
923 | spin_unlock_irq(&uport->lock); |
924 | } |
925 | mutex_unlock(&port->mutex); |
926 | |
927 | return result; |
928 | } |
929 | |
930 | static int |
931 | uart_tiocmset(struct tty_struct *tty, struct file *file, |
932 | unsigned int set, unsigned int clear) |
933 | { |
934 | struct uart_state *state = tty->driver_data; |
935 | struct uart_port *uport = state->uart_port; |
936 | struct tty_port *port = &state->port; |
937 | int ret = -EIO; |
938 | |
939 | mutex_lock(&port->mutex); |
940 | if ((!file || !tty_hung_up_p(file)) && |
941 | !(tty->flags & (1 << TTY_IO_ERROR))) { |
942 | uart_update_mctrl(uport, set, clear); |
943 | ret = 0; |
944 | } |
945 | mutex_unlock(&port->mutex); |
946 | return ret; |
947 | } |
948 | |
949 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
950 | { |
951 | struct uart_state *state = tty->driver_data; |
952 | struct tty_port *port = &state->port; |
953 | struct uart_port *uport = state->uart_port; |
954 | |
955 | mutex_lock(&port->mutex); |
956 | |
957 | if (uport->type != PORT_UNKNOWN) |
958 | uport->ops->break_ctl(uport, break_state); |
959 | |
960 | mutex_unlock(&port->mutex); |
961 | return 0; |
962 | } |
963 | |
964 | static int uart_do_autoconfig(struct uart_state *state) |
965 | { |
966 | struct uart_port *uport = state->uart_port; |
967 | struct tty_port *port = &state->port; |
968 | int flags, ret; |
969 | |
970 | if (!capable(CAP_SYS_ADMIN)) |
971 | return -EPERM; |
972 | |
973 | /* |
974 | * Take the per-port semaphore. This prevents count from |
975 | * changing, and hence any extra opens of the port while |
976 | * we're auto-configuring. |
977 | */ |
978 | if (mutex_lock_interruptible(&port->mutex)) |
979 | return -ERESTARTSYS; |
980 | |
981 | ret = -EBUSY; |
982 | if (tty_port_users(port) == 1) { |
983 | uart_shutdown(state); |
984 | |
985 | /* |
986 | * If we already have a port type configured, |
987 | * we must release its resources. |
988 | */ |
989 | if (uport->type != PORT_UNKNOWN) |
990 | uport->ops->release_port(uport); |
991 | |
992 | flags = UART_CONFIG_TYPE; |
993 | if (uport->flags & UPF_AUTO_IRQ) |
994 | flags |= UART_CONFIG_IRQ; |
995 | |
996 | /* |
997 | * This will claim the ports resources if |
998 | * a port is found. |
999 | */ |
1000 | uport->ops->config_port(uport, flags); |
1001 | |
1002 | ret = uart_startup(state, 1); |
1003 | } |
1004 | mutex_unlock(&port->mutex); |
1005 | return ret; |
1006 | } |
1007 | |
1008 | /* |
1009 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change |
1010 | * - mask passed in arg for lines of interest |
1011 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) |
1012 | * Caller should use TIOCGICOUNT to see which one it was |
1013 | * |
1014 | * FIXME: This wants extracting into a common all driver implementation |
1015 | * of TIOCMWAIT using tty_port. |
1016 | */ |
1017 | static int |
1018 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) |
1019 | { |
1020 | struct uart_port *uport = state->uart_port; |
1021 | struct tty_port *port = &state->port; |
1022 | DECLARE_WAITQUEUE(wait, current); |
1023 | struct uart_icount cprev, cnow; |
1024 | int ret; |
1025 | |
1026 | /* |
1027 | * note the counters on entry |
1028 | */ |
1029 | spin_lock_irq(&uport->lock); |
1030 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); |
1031 | |
1032 | /* |
1033 | * Force modem status interrupts on |
1034 | */ |
1035 | uport->ops->enable_ms(uport); |
1036 | spin_unlock_irq(&uport->lock); |
1037 | |
1038 | add_wait_queue(&port->delta_msr_wait, &wait); |
1039 | for (;;) { |
1040 | spin_lock_irq(&uport->lock); |
1041 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
1042 | spin_unlock_irq(&uport->lock); |
1043 | |
1044 | set_current_state(TASK_INTERRUPTIBLE); |
1045 | |
1046 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || |
1047 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || |
1048 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || |
1049 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { |
1050 | ret = 0; |
1051 | break; |
1052 | } |
1053 | |
1054 | schedule(); |
1055 | |
1056 | /* see if a signal did it */ |
1057 | if (signal_pending(current)) { |
1058 | ret = -ERESTARTSYS; |
1059 | break; |
1060 | } |
1061 | |
1062 | cprev = cnow; |
1063 | } |
1064 | |
1065 | current->state = TASK_RUNNING; |
1066 | remove_wait_queue(&port->delta_msr_wait, &wait); |
1067 | |
1068 | return ret; |
1069 | } |
1070 | |
1071 | /* |
1072 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) |
1073 | * Return: write counters to the user passed counter struct |
1074 | * NB: both 1->0 and 0->1 transitions are counted except for |
1075 | * RI where only 0->1 is counted. |
1076 | */ |
1077 | static int uart_get_count(struct uart_state *state, |
1078 | struct serial_icounter_struct __user *icnt) |
1079 | { |
1080 | struct serial_icounter_struct icount; |
1081 | struct uart_icount cnow; |
1082 | struct uart_port *uport = state->uart_port; |
1083 | |
1084 | spin_lock_irq(&uport->lock); |
1085 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
1086 | spin_unlock_irq(&uport->lock); |
1087 | |
1088 | icount.cts = cnow.cts; |
1089 | icount.dsr = cnow.dsr; |
1090 | icount.rng = cnow.rng; |
1091 | icount.dcd = cnow.dcd; |
1092 | icount.rx = cnow.rx; |
1093 | icount.tx = cnow.tx; |
1094 | icount.frame = cnow.frame; |
1095 | icount.overrun = cnow.overrun; |
1096 | icount.parity = cnow.parity; |
1097 | icount.brk = cnow.brk; |
1098 | icount.buf_overrun = cnow.buf_overrun; |
1099 | |
1100 | return copy_to_user(icnt, &icount, sizeof(icount)) ? -EFAULT : 0; |
1101 | } |
1102 | |
1103 | /* |
1104 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1105 | */ |
1106 | static int |
1107 | uart_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, |
1108 | unsigned long arg) |
1109 | { |
1110 | struct uart_state *state = tty->driver_data; |
1111 | struct tty_port *port = &state->port; |
1112 | void __user *uarg = (void __user *)arg; |
1113 | int ret = -ENOIOCTLCMD; |
1114 | |
1115 | |
1116 | /* |
1117 | * These ioctls don't rely on the hardware to be present. |
1118 | */ |
1119 | switch (cmd) { |
1120 | case TIOCGSERIAL: |
1121 | ret = uart_get_info(state, uarg); |
1122 | break; |
1123 | |
1124 | case TIOCSSERIAL: |
1125 | ret = uart_set_info(state, uarg); |
1126 | break; |
1127 | |
1128 | case TIOCSERCONFIG: |
1129 | ret = uart_do_autoconfig(state); |
1130 | break; |
1131 | |
1132 | case TIOCSERGWILD: /* obsolete */ |
1133 | case TIOCSERSWILD: /* obsolete */ |
1134 | ret = 0; |
1135 | break; |
1136 | } |
1137 | |
1138 | if (ret != -ENOIOCTLCMD) |
1139 | goto out; |
1140 | |
1141 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
1142 | ret = -EIO; |
1143 | goto out; |
1144 | } |
1145 | |
1146 | /* |
1147 | * The following should only be used when hardware is present. |
1148 | */ |
1149 | switch (cmd) { |
1150 | case TIOCMIWAIT: |
1151 | ret = uart_wait_modem_status(state, arg); |
1152 | break; |
1153 | |
1154 | case TIOCGICOUNT: |
1155 | ret = uart_get_count(state, uarg); |
1156 | break; |
1157 | } |
1158 | |
1159 | if (ret != -ENOIOCTLCMD) |
1160 | goto out; |
1161 | |
1162 | mutex_lock(&port->mutex); |
1163 | |
1164 | if (tty_hung_up_p(filp)) { |
1165 | ret = -EIO; |
1166 | goto out_up; |
1167 | } |
1168 | |
1169 | /* |
1170 | * All these rely on hardware being present and need to be |
1171 | * protected against the tty being hung up. |
1172 | */ |
1173 | switch (cmd) { |
1174 | case TIOCSERGETLSR: /* Get line status register */ |
1175 | ret = uart_get_lsr_info(state, uarg); |
1176 | break; |
1177 | |
1178 | default: { |
1179 | struct uart_port *uport = state->uart_port; |
1180 | if (uport->ops->ioctl) |
1181 | ret = uport->ops->ioctl(uport, cmd, arg); |
1182 | break; |
1183 | } |
1184 | } |
1185 | out_up: |
1186 | mutex_unlock(&port->mutex); |
1187 | out: |
1188 | return ret; |
1189 | } |
1190 | |
1191 | static void uart_set_ldisc(struct tty_struct *tty) |
1192 | { |
1193 | struct uart_state *state = tty->driver_data; |
1194 | struct uart_port *uport = state->uart_port; |
1195 | |
1196 | if (uport->ops->set_ldisc) |
1197 | uport->ops->set_ldisc(uport); |
1198 | } |
1199 | |
1200 | static void uart_set_termios(struct tty_struct *tty, |
1201 | struct ktermios *old_termios) |
1202 | { |
1203 | struct uart_state *state = tty->driver_data; |
1204 | unsigned long flags; |
1205 | unsigned int cflag = tty->termios->c_cflag; |
1206 | |
1207 | |
1208 | /* |
1209 | * These are the bits that are used to setup various |
1210 | * flags in the low level driver. We can ignore the Bfoo |
1211 | * bits in c_cflag; c_[io]speed will always be set |
1212 | * appropriately by set_termios() in tty_ioctl.c |
1213 | */ |
1214 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
1215 | if ((cflag ^ old_termios->c_cflag) == 0 && |
1216 | tty->termios->c_ospeed == old_termios->c_ospeed && |
1217 | tty->termios->c_ispeed == old_termios->c_ispeed && |
1218 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { |
1219 | return; |
1220 | } |
1221 | |
1222 | uart_change_speed(state, old_termios); |
1223 | |
1224 | /* Handle transition to B0 status */ |
1225 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) |
1226 | uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); |
1227 | /* Handle transition away from B0 status */ |
1228 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1229 | unsigned int mask = TIOCM_DTR; |
1230 | if (!(cflag & CRTSCTS) || |
1231 | !test_bit(TTY_THROTTLED, &tty->flags)) |
1232 | mask |= TIOCM_RTS; |
1233 | uart_set_mctrl(state->uart_port, mask); |
1234 | } |
1235 | |
1236 | /* Handle turning off CRTSCTS */ |
1237 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { |
1238 | spin_lock_irqsave(&state->uart_port->lock, flags); |
1239 | tty->hw_stopped = 0; |
1240 | __uart_start(tty); |
1241 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
1242 | } |
1243 | /* Handle turning on CRTSCTS */ |
1244 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
1245 | spin_lock_irqsave(&state->uart_port->lock, flags); |
1246 | if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { |
1247 | tty->hw_stopped = 1; |
1248 | state->uart_port->ops->stop_tx(state->uart_port); |
1249 | } |
1250 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
1251 | } |
1252 | #if 0 |
1253 | /* |
1254 | * No need to wake up processes in open wait, since they |
1255 | * sample the CLOCAL flag once, and don't recheck it. |
1256 | * XXX It's not clear whether the current behavior is correct |
1257 | * or not. Hence, this may change..... |
1258 | */ |
1259 | if (!(old_termios->c_cflag & CLOCAL) && |
1260 | (tty->termios->c_cflag & CLOCAL)) |
1261 | wake_up_interruptible(&state->uart_port.open_wait); |
1262 | #endif |
1263 | } |
1264 | |
1265 | /* |
1266 | * In 2.4.5, calls to this will be serialized via the BKL in |
1267 | * linux/drivers/char/tty_io.c:tty_release() |
1268 | * linux/drivers/char/tty_io.c:do_tty_handup() |
1269 | */ |
1270 | static void uart_close(struct tty_struct *tty, struct file *filp) |
1271 | { |
1272 | struct uart_state *state = tty->driver_data; |
1273 | struct tty_port *port; |
1274 | struct uart_port *uport; |
1275 | |
1276 | BUG_ON(!kernel_locked()); |
1277 | |
1278 | if (!state) |
1279 | return; |
1280 | |
1281 | uport = state->uart_port; |
1282 | port = &state->port; |
1283 | |
1284 | pr_debug("uart_close(%d) called\n", uport->line); |
1285 | |
1286 | mutex_lock(&port->mutex); |
1287 | |
1288 | if (tty_hung_up_p(filp)) |
1289 | goto done; |
1290 | |
1291 | if ((tty->count == 1) && (port->count != 1)) { |
1292 | /* |
1293 | * Uh, oh. tty->count is 1, which means that the tty |
1294 | * structure will be freed. port->count should always |
1295 | * be one in these conditions. If it's greater than |
1296 | * one, we've got real problems, since it means the |
1297 | * serial port won't be shutdown. |
1298 | */ |
1299 | printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, " |
1300 | "port->count is %d\n", port->count); |
1301 | port->count = 1; |
1302 | } |
1303 | if (--port->count < 0) { |
1304 | printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n", |
1305 | tty->name, port->count); |
1306 | port->count = 0; |
1307 | } |
1308 | if (port->count) |
1309 | goto done; |
1310 | |
1311 | /* |
1312 | * Now we wait for the transmit buffer to clear; and we notify |
1313 | * the line discipline to only process XON/XOFF characters by |
1314 | * setting tty->closing. |
1315 | */ |
1316 | tty->closing = 1; |
1317 | |
1318 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
1319 | tty_wait_until_sent(tty, msecs_to_jiffies(port->closing_wait)); |
1320 | |
1321 | /* |
1322 | * At this point, we stop accepting input. To do this, we |
1323 | * disable the receive line status interrupts. |
1324 | */ |
1325 | if (port->flags & ASYNC_INITIALIZED) { |
1326 | unsigned long flags; |
1327 | spin_lock_irqsave(&uport->lock, flags); |
1328 | uport->ops->stop_rx(uport); |
1329 | spin_unlock_irqrestore(&uport->lock, flags); |
1330 | /* |
1331 | * Before we drop DTR, make sure the UART transmitter |
1332 | * has completely drained; this is especially |
1333 | * important if there is a transmit FIFO! |
1334 | */ |
1335 | uart_wait_until_sent(tty, uport->timeout); |
1336 | } |
1337 | |
1338 | uart_shutdown(state); |
1339 | uart_flush_buffer(tty); |
1340 | |
1341 | tty_ldisc_flush(tty); |
1342 | |
1343 | tty->closing = 0; |
1344 | tty_port_tty_set(port, NULL); |
1345 | |
1346 | if (port->blocked_open) { |
1347 | if (port->close_delay) |
1348 | msleep_interruptible(port->close_delay); |
1349 | } else if (!uart_console(uport)) { |
1350 | uart_change_pm(state, 3); |
1351 | } |
1352 | |
1353 | /* |
1354 | * Wake up anyone trying to open this port. |
1355 | */ |
1356 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
1357 | wake_up_interruptible(&port->open_wait); |
1358 | |
1359 | done: |
1360 | mutex_unlock(&port->mutex); |
1361 | } |
1362 | |
1363 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
1364 | { |
1365 | struct uart_state *state = tty->driver_data; |
1366 | struct uart_port *port = state->uart_port; |
1367 | unsigned long char_time, expire; |
1368 | |
1369 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1370 | return; |
1371 | |
1372 | lock_kernel(); |
1373 | |
1374 | /* |
1375 | * Set the check interval to be 1/5 of the estimated time to |
1376 | * send a single character, and make it at least 1. The check |
1377 | * interval should also be less than the timeout. |
1378 | * |
1379 | * Note: we have to use pretty tight timings here to satisfy |
1380 | * the NIST-PCTS. |
1381 | */ |
1382 | char_time = (port->timeout - HZ/50) / port->fifosize; |
1383 | char_time = char_time / 5; |
1384 | if (char_time == 0) |
1385 | char_time = 1; |
1386 | if (timeout && timeout < char_time) |
1387 | char_time = timeout; |
1388 | |
1389 | /* |
1390 | * If the transmitter hasn't cleared in twice the approximate |
1391 | * amount of time to send the entire FIFO, it probably won't |
1392 | * ever clear. This assumes the UART isn't doing flow |
1393 | * control, which is currently the case. Hence, if it ever |
1394 | * takes longer than port->timeout, this is probably due to a |
1395 | * UART bug of some kind. So, we clamp the timeout parameter at |
1396 | * 2*port->timeout. |
1397 | */ |
1398 | if (timeout == 0 || timeout > 2 * port->timeout) |
1399 | timeout = 2 * port->timeout; |
1400 | |
1401 | expire = jiffies + timeout; |
1402 | |
1403 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
1404 | port->line, jiffies, expire); |
1405 | |
1406 | /* |
1407 | * Check whether the transmitter is empty every 'char_time'. |
1408 | * 'timeout' / 'expire' give us the maximum amount of time |
1409 | * we wait. |
1410 | */ |
1411 | while (!port->ops->tx_empty(port)) { |
1412 | msleep_interruptible(jiffies_to_msecs(char_time)); |
1413 | if (signal_pending(current)) |
1414 | break; |
1415 | if (time_after(jiffies, expire)) |
1416 | break; |
1417 | } |
1418 | set_current_state(TASK_RUNNING); /* might not be needed */ |
1419 | unlock_kernel(); |
1420 | } |
1421 | |
1422 | /* |
1423 | * This is called with the BKL held in |
1424 | * linux/drivers/char/tty_io.c:do_tty_hangup() |
1425 | * We're called from the eventd thread, so we can sleep for |
1426 | * a _short_ time only. |
1427 | */ |
1428 | static void uart_hangup(struct tty_struct *tty) |
1429 | { |
1430 | struct uart_state *state = tty->driver_data; |
1431 | struct tty_port *port = &state->port; |
1432 | |
1433 | BUG_ON(!kernel_locked()); |
1434 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
1435 | |
1436 | mutex_lock(&port->mutex); |
1437 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
1438 | uart_flush_buffer(tty); |
1439 | uart_shutdown(state); |
1440 | port->count = 0; |
1441 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
1442 | tty_port_tty_set(port, NULL); |
1443 | wake_up_interruptible(&port->open_wait); |
1444 | wake_up_interruptible(&port->delta_msr_wait); |
1445 | } |
1446 | mutex_unlock(&port->mutex); |
1447 | } |
1448 | |
1449 | /* |
1450 | * Copy across the serial console cflag setting into the termios settings |
1451 | * for the initial open of the port. This allows continuity between the |
1452 | * kernel settings, and the settings init adopts when it opens the port |
1453 | * for the first time. |
1454 | */ |
1455 | static void uart_update_termios(struct uart_state *state) |
1456 | { |
1457 | struct tty_struct *tty = state->port.tty; |
1458 | struct uart_port *port = state->uart_port; |
1459 | |
1460 | if (uart_console(port) && port->cons->cflag) { |
1461 | tty->termios->c_cflag = port->cons->cflag; |
1462 | port->cons->cflag = 0; |
1463 | } |
1464 | |
1465 | /* |
1466 | * If the device failed to grab its irq resources, |
1467 | * or some other error occurred, don't try to talk |
1468 | * to the port hardware. |
1469 | */ |
1470 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
1471 | /* |
1472 | * Make termios settings take effect. |
1473 | */ |
1474 | uart_change_speed(state, NULL); |
1475 | |
1476 | /* |
1477 | * And finally enable the RTS and DTR signals. |
1478 | */ |
1479 | if (tty->termios->c_cflag & CBAUD) |
1480 | uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); |
1481 | } |
1482 | } |
1483 | |
1484 | /* |
1485 | * Block the open until the port is ready. We must be called with |
1486 | * the per-port semaphore held. |
1487 | */ |
1488 | static int |
1489 | uart_block_til_ready(struct file *filp, struct uart_state *state) |
1490 | { |
1491 | DECLARE_WAITQUEUE(wait, current); |
1492 | struct uart_port *uport = state->uart_port; |
1493 | struct tty_port *port = &state->port; |
1494 | unsigned int mctrl; |
1495 | |
1496 | port->blocked_open++; |
1497 | port->count--; |
1498 | |
1499 | add_wait_queue(&port->open_wait, &wait); |
1500 | while (1) { |
1501 | set_current_state(TASK_INTERRUPTIBLE); |
1502 | |
1503 | /* |
1504 | * If we have been hung up, tell userspace/restart open. |
1505 | */ |
1506 | if (tty_hung_up_p(filp) || port->tty == NULL) |
1507 | break; |
1508 | |
1509 | /* |
1510 | * If the port has been closed, tell userspace/restart open. |
1511 | */ |
1512 | if (!(port->flags & ASYNC_INITIALIZED)) |
1513 | break; |
1514 | |
1515 | /* |
1516 | * If non-blocking mode is set, or CLOCAL mode is set, |
1517 | * we don't want to wait for the modem status lines to |
1518 | * indicate that the port is ready. |
1519 | * |
1520 | * Also, if the port is not enabled/configured, we want |
1521 | * to allow the open to succeed here. Note that we will |
1522 | * have set TTY_IO_ERROR for a non-existant port. |
1523 | */ |
1524 | if ((filp->f_flags & O_NONBLOCK) || |
1525 | (port->tty->termios->c_cflag & CLOCAL) || |
1526 | (port->tty->flags & (1 << TTY_IO_ERROR))) |
1527 | break; |
1528 | |
1529 | /* |
1530 | * Set DTR to allow modem to know we're waiting. Do |
1531 | * not set RTS here - we want to make sure we catch |
1532 | * the data from the modem. |
1533 | */ |
1534 | if (port->tty->termios->c_cflag & CBAUD) |
1535 | uart_set_mctrl(uport, TIOCM_DTR); |
1536 | |
1537 | /* |
1538 | * and wait for the carrier to indicate that the |
1539 | * modem is ready for us. |
1540 | */ |
1541 | spin_lock_irq(&uport->lock); |
1542 | uport->ops->enable_ms(uport); |
1543 | mctrl = uport->ops->get_mctrl(uport); |
1544 | spin_unlock_irq(&uport->lock); |
1545 | if (mctrl & TIOCM_CAR) |
1546 | break; |
1547 | |
1548 | mutex_unlock(&port->mutex); |
1549 | schedule(); |
1550 | mutex_lock(&port->mutex); |
1551 | |
1552 | if (signal_pending(current)) |
1553 | break; |
1554 | } |
1555 | set_current_state(TASK_RUNNING); |
1556 | remove_wait_queue(&port->open_wait, &wait); |
1557 | |
1558 | port->count++; |
1559 | port->blocked_open--; |
1560 | |
1561 | if (signal_pending(current)) |
1562 | return -ERESTARTSYS; |
1563 | |
1564 | if (!port->tty || tty_hung_up_p(filp)) |
1565 | return -EAGAIN; |
1566 | |
1567 | return 0; |
1568 | } |
1569 | |
1570 | static struct uart_state *uart_get(struct uart_driver *drv, int line) |
1571 | { |
1572 | struct uart_state *state; |
1573 | struct tty_port *port; |
1574 | int ret = 0; |
1575 | |
1576 | state = drv->state + line; |
1577 | port = &state->port; |
1578 | if (mutex_lock_interruptible(&port->mutex)) { |
1579 | ret = -ERESTARTSYS; |
1580 | goto err; |
1581 | } |
1582 | |
1583 | port->count++; |
1584 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { |
1585 | ret = -ENXIO; |
1586 | goto err_unlock; |
1587 | } |
1588 | return state; |
1589 | |
1590 | err_unlock: |
1591 | port->count--; |
1592 | mutex_unlock(&port->mutex); |
1593 | err: |
1594 | return ERR_PTR(ret); |
1595 | } |
1596 | |
1597 | /* |
1598 | * calls to uart_open are serialised by the BKL in |
1599 | * fs/char_dev.c:chrdev_open() |
1600 | * Note that if this fails, then uart_close() _will_ be called. |
1601 | * |
1602 | * In time, we want to scrap the "opening nonpresent ports" |
1603 | * behaviour and implement an alternative way for setserial |
1604 | * to set base addresses/ports/types. This will allow us to |
1605 | * get rid of a certain amount of extra tests. |
1606 | */ |
1607 | static int uart_open(struct tty_struct *tty, struct file *filp) |
1608 | { |
1609 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; |
1610 | struct uart_state *state; |
1611 | struct tty_port *port; |
1612 | int retval, line = tty->index; |
1613 | |
1614 | BUG_ON(!kernel_locked()); |
1615 | pr_debug("uart_open(%d) called\n", line); |
1616 | |
1617 | /* |
1618 | * tty->driver->num won't change, so we won't fail here with |
1619 | * tty->driver_data set to something non-NULL (and therefore |
1620 | * we won't get caught by uart_close()). |
1621 | */ |
1622 | retval = -ENODEV; |
1623 | if (line >= tty->driver->num) |
1624 | goto fail; |
1625 | |
1626 | /* |
1627 | * We take the semaphore inside uart_get to guarantee that we won't |
1628 | * be re-entered while allocating the state structure, or while we |
1629 | * request any IRQs that the driver may need. This also has the nice |
1630 | * side-effect that it delays the action of uart_hangup, so we can |
1631 | * guarantee that state->port.tty will always contain something |
1632 | * reasonable. |
1633 | */ |
1634 | state = uart_get(drv, line); |
1635 | if (IS_ERR(state)) { |
1636 | retval = PTR_ERR(state); |
1637 | goto fail; |
1638 | } |
1639 | port = &state->port; |
1640 | |
1641 | /* |
1642 | * Once we set tty->driver_data here, we are guaranteed that |
1643 | * uart_close() will decrement the driver module use count. |
1644 | * Any failures from here onwards should not touch the count. |
1645 | */ |
1646 | tty->driver_data = state; |
1647 | state->uart_port->state = state; |
1648 | tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; |
1649 | tty->alt_speed = 0; |
1650 | tty_port_tty_set(port, tty); |
1651 | |
1652 | /* |
1653 | * If the port is in the middle of closing, bail out now. |
1654 | */ |
1655 | if (tty_hung_up_p(filp)) { |
1656 | retval = -EAGAIN; |
1657 | port->count--; |
1658 | mutex_unlock(&port->mutex); |
1659 | goto fail; |
1660 | } |
1661 | |
1662 | /* |
1663 | * Make sure the device is in D0 state. |
1664 | */ |
1665 | if (port->count == 1) |
1666 | uart_change_pm(state, 0); |
1667 | |
1668 | /* |
1669 | * Start up the serial port. |
1670 | */ |
1671 | retval = uart_startup(state, 0); |
1672 | |
1673 | /* |
1674 | * If we succeeded, wait until the port is ready. |
1675 | */ |
1676 | if (retval == 0) |
1677 | retval = uart_block_til_ready(filp, state); |
1678 | mutex_unlock(&port->mutex); |
1679 | |
1680 | /* |
1681 | * If this is the first open to succeed, adjust things to suit. |
1682 | */ |
1683 | if (retval == 0 && !(port->flags & ASYNC_NORMAL_ACTIVE)) { |
1684 | set_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
1685 | |
1686 | uart_update_termios(state); |
1687 | } |
1688 | |
1689 | fail: |
1690 | return retval; |
1691 | } |
1692 | |
1693 | static const char *uart_type(struct uart_port *port) |
1694 | { |
1695 | const char *str = NULL; |
1696 | |
1697 | if (port->ops->type) |
1698 | str = port->ops->type(port); |
1699 | |
1700 | if (!str) |
1701 | str = "unknown"; |
1702 | |
1703 | return str; |
1704 | } |
1705 | |
1706 | #ifdef CONFIG_PROC_FS |
1707 | |
1708 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1709 | { |
1710 | struct uart_state *state = drv->state + i; |
1711 | struct tty_port *port = &state->port; |
1712 | int pm_state; |
1713 | struct uart_port *uport = state->uart_port; |
1714 | char stat_buf[32]; |
1715 | unsigned int status; |
1716 | int mmio; |
1717 | |
1718 | if (!uport) |
1719 | return; |
1720 | |
1721 | mmio = uport->iotype >= UPIO_MEM; |
1722 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
1723 | uport->line, uart_type(uport), |
1724 | mmio ? "mmio:0x" : "port:", |
1725 | mmio ? (unsigned long long)uport->mapbase |
1726 | : (unsigned long long)uport->iobase, |
1727 | uport->irq); |
1728 | |
1729 | if (uport->type == PORT_UNKNOWN) { |
1730 | seq_putc(m, '\n'); |
1731 | return; |
1732 | } |
1733 | |
1734 | if (capable(CAP_SYS_ADMIN)) { |
1735 | mutex_lock(&port->mutex); |
1736 | pm_state = state->pm_state; |
1737 | if (pm_state) |
1738 | uart_change_pm(state, 0); |
1739 | spin_lock_irq(&uport->lock); |
1740 | status = uport->ops->get_mctrl(uport); |
1741 | spin_unlock_irq(&uport->lock); |
1742 | if (pm_state) |
1743 | uart_change_pm(state, pm_state); |
1744 | mutex_unlock(&port->mutex); |
1745 | |
1746 | seq_printf(m, " tx:%d rx:%d", |
1747 | uport->icount.tx, uport->icount.rx); |
1748 | if (uport->icount.frame) |
1749 | seq_printf(m, " fe:%d", |
1750 | uport->icount.frame); |
1751 | if (uport->icount.parity) |
1752 | seq_printf(m, " pe:%d", |
1753 | uport->icount.parity); |
1754 | if (uport->icount.brk) |
1755 | seq_printf(m, " brk:%d", |
1756 | uport->icount.brk); |
1757 | if (uport->icount.overrun) |
1758 | seq_printf(m, " oe:%d", |
1759 | uport->icount.overrun); |
1760 | |
1761 | #define INFOBIT(bit, str) \ |
1762 | if (uport->mctrl & (bit)) \ |
1763 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1764 | strlen(stat_buf) - 2) |
1765 | #define STATBIT(bit, str) \ |
1766 | if (status & (bit)) \ |
1767 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1768 | strlen(stat_buf) - 2) |
1769 | |
1770 | stat_buf[0] = '\0'; |
1771 | stat_buf[1] = '\0'; |
1772 | INFOBIT(TIOCM_RTS, "|RTS"); |
1773 | STATBIT(TIOCM_CTS, "|CTS"); |
1774 | INFOBIT(TIOCM_DTR, "|DTR"); |
1775 | STATBIT(TIOCM_DSR, "|DSR"); |
1776 | STATBIT(TIOCM_CAR, "|CD"); |
1777 | STATBIT(TIOCM_RNG, "|RI"); |
1778 | if (stat_buf[0]) |
1779 | stat_buf[0] = ' '; |
1780 | |
1781 | seq_puts(m, stat_buf); |
1782 | } |
1783 | seq_putc(m, '\n'); |
1784 | #undef STATBIT |
1785 | #undef INFOBIT |
1786 | } |
1787 | |
1788 | static int uart_proc_show(struct seq_file *m, void *v) |
1789 | { |
1790 | struct tty_driver *ttydrv = m->private; |
1791 | struct uart_driver *drv = ttydrv->driver_state; |
1792 | int i; |
1793 | |
1794 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
1795 | "", "", ""); |
1796 | for (i = 0; i < drv->nr; i++) |
1797 | uart_line_info(m, drv, i); |
1798 | return 0; |
1799 | } |
1800 | |
1801 | static int uart_proc_open(struct inode *inode, struct file *file) |
1802 | { |
1803 | return single_open(file, uart_proc_show, PDE(inode)->data); |
1804 | } |
1805 | |
1806 | static const struct file_operations uart_proc_fops = { |
1807 | .owner = THIS_MODULE, |
1808 | .open = uart_proc_open, |
1809 | .read = seq_read, |
1810 | .llseek = seq_lseek, |
1811 | .release = single_release, |
1812 | }; |
1813 | #endif |
1814 | |
1815 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
1816 | /* |
1817 | * uart_console_write - write a console message to a serial port |
1818 | * @port: the port to write the message |
1819 | * @s: array of characters |
1820 | * @count: number of characters in string to write |
1821 | * @write: function to write character to port |
1822 | */ |
1823 | void uart_console_write(struct uart_port *port, const char *s, |
1824 | unsigned int count, |
1825 | void (*putchar)(struct uart_port *, int)) |
1826 | { |
1827 | unsigned int i; |
1828 | |
1829 | for (i = 0; i < count; i++, s++) { |
1830 | if (*s == '\n') |
1831 | putchar(port, '\r'); |
1832 | putchar(port, *s); |
1833 | } |
1834 | } |
1835 | EXPORT_SYMBOL_GPL(uart_console_write); |
1836 | |
1837 | /* |
1838 | * Check whether an invalid uart number has been specified, and |
1839 | * if so, search for the first available port that does have |
1840 | * console support. |
1841 | */ |
1842 | struct uart_port * __init |
1843 | uart_get_console(struct uart_port *ports, int nr, struct console *co) |
1844 | { |
1845 | int idx = co->index; |
1846 | |
1847 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && |
1848 | ports[idx].membase == NULL)) |
1849 | for (idx = 0; idx < nr; idx++) |
1850 | if (ports[idx].iobase != 0 || |
1851 | ports[idx].membase != NULL) |
1852 | break; |
1853 | |
1854 | co->index = idx; |
1855 | |
1856 | return ports + idx; |
1857 | } |
1858 | |
1859 | /** |
1860 | * uart_parse_options - Parse serial port baud/parity/bits/flow contro. |
1861 | * @options: pointer to option string |
1862 | * @baud: pointer to an 'int' variable for the baud rate. |
1863 | * @parity: pointer to an 'int' variable for the parity. |
1864 | * @bits: pointer to an 'int' variable for the number of data bits. |
1865 | * @flow: pointer to an 'int' variable for the flow control character. |
1866 | * |
1867 | * uart_parse_options decodes a string containing the serial console |
1868 | * options. The format of the string is <baud><parity><bits><flow>, |
1869 | * eg: 115200n8r |
1870 | */ |
1871 | void |
1872 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1873 | { |
1874 | char *s = options; |
1875 | |
1876 | *baud = simple_strtoul(s, NULL, 10); |
1877 | while (*s >= '0' && *s <= '9') |
1878 | s++; |
1879 | if (*s) |
1880 | *parity = *s++; |
1881 | if (*s) |
1882 | *bits = *s++ - '0'; |
1883 | if (*s) |
1884 | *flow = *s; |
1885 | } |
1886 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1887 | |
1888 | struct baud_rates { |
1889 | unsigned int rate; |
1890 | unsigned int cflag; |
1891 | }; |
1892 | |
1893 | static const struct baud_rates baud_rates[] = { |
1894 | { 921600, B921600 }, |
1895 | { 460800, B460800 }, |
1896 | { 230400, B230400 }, |
1897 | { 115200, B115200 }, |
1898 | { 57600, B57600 }, |
1899 | { 38400, B38400 }, |
1900 | { 19200, B19200 }, |
1901 | { 9600, B9600 }, |
1902 | { 4800, B4800 }, |
1903 | { 2400, B2400 }, |
1904 | { 1200, B1200 }, |
1905 | { 0, B38400 } |
1906 | }; |
1907 | |
1908 | /** |
1909 | * uart_set_options - setup the serial console parameters |
1910 | * @port: pointer to the serial ports uart_port structure |
1911 | * @co: console pointer |
1912 | * @baud: baud rate |
1913 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) |
1914 | * @bits: number of data bits |
1915 | * @flow: flow control character - 'r' (rts) |
1916 | */ |
1917 | int |
1918 | uart_set_options(struct uart_port *port, struct console *co, |
1919 | int baud, int parity, int bits, int flow) |
1920 | { |
1921 | struct ktermios termios; |
1922 | static struct ktermios dummy; |
1923 | int i; |
1924 | |
1925 | /* |
1926 | * Ensure that the serial console lock is initialised |
1927 | * early. |
1928 | */ |
1929 | spin_lock_init(&port->lock); |
1930 | lockdep_set_class(&port->lock, &port_lock_key); |
1931 | |
1932 | memset(&termios, 0, sizeof(struct ktermios)); |
1933 | |
1934 | termios.c_cflag = CREAD | HUPCL | CLOCAL; |
1935 | |
1936 | /* |
1937 | * Construct a cflag setting. |
1938 | */ |
1939 | for (i = 0; baud_rates[i].rate; i++) |
1940 | if (baud_rates[i].rate <= baud) |
1941 | break; |
1942 | |
1943 | termios.c_cflag |= baud_rates[i].cflag; |
1944 | |
1945 | if (bits == 7) |
1946 | termios.c_cflag |= CS7; |
1947 | else |
1948 | termios.c_cflag |= CS8; |
1949 | |
1950 | switch (parity) { |
1951 | case 'o': case 'O': |
1952 | termios.c_cflag |= PARODD; |
1953 | /*fall through*/ |
1954 | case 'e': case 'E': |
1955 | termios.c_cflag |= PARENB; |
1956 | break; |
1957 | } |
1958 | |
1959 | if (flow == 'r') |
1960 | termios.c_cflag |= CRTSCTS; |
1961 | |
1962 | /* |
1963 | * some uarts on other side don't support no flow control. |
1964 | * So we set * DTR in host uart to make them happy |
1965 | */ |
1966 | port->mctrl |= TIOCM_DTR; |
1967 | |
1968 | port->ops->set_termios(port, &termios, &dummy); |
1969 | /* |
1970 | * Allow the setting of the UART parameters with a NULL console |
1971 | * too: |
1972 | */ |
1973 | if (co) |
1974 | co->cflag = termios.c_cflag; |
1975 | |
1976 | return 0; |
1977 | } |
1978 | EXPORT_SYMBOL_GPL(uart_set_options); |
1979 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1980 | |
1981 | static void uart_change_pm(struct uart_state *state, int pm_state) |
1982 | { |
1983 | struct uart_port *port = state->uart_port; |
1984 | |
1985 | if (state->pm_state != pm_state) { |
1986 | if (port->ops->pm) |
1987 | port->ops->pm(port, pm_state, state->pm_state); |
1988 | state->pm_state = pm_state; |
1989 | } |
1990 | } |
1991 | |
1992 | struct uart_match { |
1993 | struct uart_port *port; |
1994 | struct uart_driver *driver; |
1995 | }; |
1996 | |
1997 | static int serial_match_port(struct device *dev, void *data) |
1998 | { |
1999 | struct uart_match *match = data; |
2000 | struct tty_driver *tty_drv = match->driver->tty_driver; |
2001 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + |
2002 | match->port->line; |
2003 | |
2004 | return dev->devt == devt; /* Actually, only one tty per port */ |
2005 | } |
2006 | |
2007 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
2008 | { |
2009 | struct uart_state *state = drv->state + uport->line; |
2010 | struct tty_port *port = &state->port; |
2011 | struct device *tty_dev; |
2012 | struct uart_match match = {uport, drv}; |
2013 | |
2014 | mutex_lock(&port->mutex); |
2015 | |
2016 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
2017 | if (device_may_wakeup(tty_dev)) { |
2018 | enable_irq_wake(uport->irq); |
2019 | put_device(tty_dev); |
2020 | mutex_unlock(&port->mutex); |
2021 | return 0; |
2022 | } |
2023 | if (console_suspend_enabled || !uart_console(uport)) |
2024 | uport->suspended = 1; |
2025 | |
2026 | if (port->flags & ASYNC_INITIALIZED) { |
2027 | const struct uart_ops *ops = uport->ops; |
2028 | int tries; |
2029 | |
2030 | if (console_suspend_enabled || !uart_console(uport)) { |
2031 | set_bit(ASYNCB_SUSPENDED, &port->flags); |
2032 | clear_bit(ASYNCB_INITIALIZED, &port->flags); |
2033 | |
2034 | spin_lock_irq(&uport->lock); |
2035 | ops->stop_tx(uport); |
2036 | ops->set_mctrl(uport, 0); |
2037 | ops->stop_rx(uport); |
2038 | spin_unlock_irq(&uport->lock); |
2039 | } |
2040 | |
2041 | /* |
2042 | * Wait for the transmitter to empty. |
2043 | */ |
2044 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
2045 | msleep(10); |
2046 | if (!tries) |
2047 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
2048 | "transmitter\n", |
2049 | uport->dev ? dev_name(uport->dev) : "", |
2050 | uport->dev ? ": " : "", |
2051 | drv->dev_name, |
2052 | drv->tty_driver->name_base + uport->line); |
2053 | |
2054 | if (console_suspend_enabled || !uart_console(uport)) |
2055 | ops->shutdown(uport); |
2056 | } |
2057 | |
2058 | /* |
2059 | * Disable the console device before suspending. |
2060 | */ |
2061 | if (console_suspend_enabled && uart_console(uport)) |
2062 | console_stop(uport->cons); |
2063 | |
2064 | if (console_suspend_enabled || !uart_console(uport)) |
2065 | uart_change_pm(state, 3); |
2066 | |
2067 | mutex_unlock(&port->mutex); |
2068 | |
2069 | return 0; |
2070 | } |
2071 | |
2072 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
2073 | { |
2074 | struct uart_state *state = drv->state + uport->line; |
2075 | struct tty_port *port = &state->port; |
2076 | struct device *tty_dev; |
2077 | struct uart_match match = {uport, drv}; |
2078 | struct ktermios termios; |
2079 | |
2080 | mutex_lock(&port->mutex); |
2081 | |
2082 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
2083 | if (!uport->suspended && device_may_wakeup(tty_dev)) { |
2084 | disable_irq_wake(uport->irq); |
2085 | mutex_unlock(&port->mutex); |
2086 | return 0; |
2087 | } |
2088 | uport->suspended = 0; |
2089 | |
2090 | /* |
2091 | * Re-enable the console device after suspending. |
2092 | */ |
2093 | if (uart_console(uport)) { |
2094 | uart_change_pm(state, 0); |
2095 | uport->ops->set_termios(uport, &termios, NULL); |
2096 | console_start(uport->cons); |
2097 | } |
2098 | |
2099 | if (port->flags & ASYNC_SUSPENDED) { |
2100 | const struct uart_ops *ops = uport->ops; |
2101 | int ret; |
2102 | |
2103 | uart_change_pm(state, 0); |
2104 | spin_lock_irq(&uport->lock); |
2105 | ops->set_mctrl(uport, 0); |
2106 | spin_unlock_irq(&uport->lock); |
2107 | if (console_suspend_enabled || !uart_console(uport)) { |
2108 | ret = ops->startup(uport); |
2109 | if (ret == 0) { |
2110 | uart_change_speed(state, NULL); |
2111 | spin_lock_irq(&uport->lock); |
2112 | ops->set_mctrl(uport, uport->mctrl); |
2113 | ops->start_tx(uport); |
2114 | spin_unlock_irq(&uport->lock); |
2115 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
2116 | } else { |
2117 | /* |
2118 | * Failed to resume - maybe hardware went away? |
2119 | * Clear the "initialized" flag so we won't try |
2120 | * to call the low level drivers shutdown method. |
2121 | */ |
2122 | uart_shutdown(state); |
2123 | } |
2124 | } |
2125 | |
2126 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
2127 | } |
2128 | |
2129 | mutex_unlock(&port->mutex); |
2130 | |
2131 | return 0; |
2132 | } |
2133 | |
2134 | static inline void |
2135 | uart_report_port(struct uart_driver *drv, struct uart_port *port) |
2136 | { |
2137 | char address[64]; |
2138 | |
2139 | switch (port->iotype) { |
2140 | case UPIO_PORT: |
2141 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
2142 | break; |
2143 | case UPIO_HUB6: |
2144 | snprintf(address, sizeof(address), |
2145 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
2146 | break; |
2147 | case UPIO_MEM: |
2148 | case UPIO_MEM32: |
2149 | case UPIO_AU: |
2150 | case UPIO_TSI: |
2151 | case UPIO_DWAPB: |
2152 | snprintf(address, sizeof(address), |
2153 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
2154 | break; |
2155 | default: |
2156 | strlcpy(address, "*unknown*", sizeof(address)); |
2157 | break; |
2158 | } |
2159 | |
2160 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", |
2161 | port->dev ? dev_name(port->dev) : "", |
2162 | port->dev ? ": " : "", |
2163 | drv->dev_name, |
2164 | drv->tty_driver->name_base + port->line, |
2165 | address, port->irq, uart_type(port)); |
2166 | } |
2167 | |
2168 | static void |
2169 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, |
2170 | struct uart_port *port) |
2171 | { |
2172 | unsigned int flags; |
2173 | |
2174 | /* |
2175 | * If there isn't a port here, don't do anything further. |
2176 | */ |
2177 | if (!port->iobase && !port->mapbase && !port->membase) |
2178 | return; |
2179 | |
2180 | /* |
2181 | * Now do the auto configuration stuff. Note that config_port |
2182 | * is expected to claim the resources and map the port for us. |
2183 | */ |
2184 | flags = 0; |
2185 | if (port->flags & UPF_AUTO_IRQ) |
2186 | flags |= UART_CONFIG_IRQ; |
2187 | if (port->flags & UPF_BOOT_AUTOCONF) { |
2188 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2189 | port->type = PORT_UNKNOWN; |
2190 | flags |= UART_CONFIG_TYPE; |
2191 | } |
2192 | port->ops->config_port(port, flags); |
2193 | } |
2194 | |
2195 | if (port->type != PORT_UNKNOWN) { |
2196 | unsigned long flags; |
2197 | |
2198 | uart_report_port(drv, port); |
2199 | |
2200 | /* Power up port for set_mctrl() */ |
2201 | uart_change_pm(state, 0); |
2202 | |
2203 | /* |
2204 | * Ensure that the modem control lines are de-activated. |
2205 | * keep the DTR setting that is set in uart_set_options() |
2206 | * We probably don't need a spinlock around this, but |
2207 | */ |
2208 | spin_lock_irqsave(&port->lock, flags); |
2209 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
2210 | spin_unlock_irqrestore(&port->lock, flags); |
2211 | |
2212 | /* |
2213 | * If this driver supports console, and it hasn't been |
2214 | * successfully registered yet, try to re-register it. |
2215 | * It may be that the port was not available. |
2216 | */ |
2217 | if (port->cons && !(port->cons->flags & CON_ENABLED)) |
2218 | register_console(port->cons); |
2219 | |
2220 | /* |
2221 | * Power down all ports by default, except the |
2222 | * console if we have one. |
2223 | */ |
2224 | if (!uart_console(port)) |
2225 | uart_change_pm(state, 3); |
2226 | } |
2227 | } |
2228 | |
2229 | #ifdef CONFIG_CONSOLE_POLL |
2230 | |
2231 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) |
2232 | { |
2233 | struct uart_driver *drv = driver->driver_state; |
2234 | struct uart_state *state = drv->state + line; |
2235 | struct uart_port *port; |
2236 | int baud = 9600; |
2237 | int bits = 8; |
2238 | int parity = 'n'; |
2239 | int flow = 'n'; |
2240 | |
2241 | if (!state || !state->uart_port) |
2242 | return -1; |
2243 | |
2244 | port = state->uart_port; |
2245 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
2246 | return -1; |
2247 | |
2248 | if (options) { |
2249 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
2250 | return uart_set_options(port, NULL, baud, parity, bits, flow); |
2251 | } |
2252 | |
2253 | return 0; |
2254 | } |
2255 | |
2256 | static int uart_poll_get_char(struct tty_driver *driver, int line) |
2257 | { |
2258 | struct uart_driver *drv = driver->driver_state; |
2259 | struct uart_state *state = drv->state + line; |
2260 | struct uart_port *port; |
2261 | |
2262 | if (!state || !state->uart_port) |
2263 | return -1; |
2264 | |
2265 | port = state->uart_port; |
2266 | return port->ops->poll_get_char(port); |
2267 | } |
2268 | |
2269 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) |
2270 | { |
2271 | struct uart_driver *drv = driver->driver_state; |
2272 | struct uart_state *state = drv->state + line; |
2273 | struct uart_port *port; |
2274 | |
2275 | if (!state || !state->uart_port) |
2276 | return; |
2277 | |
2278 | port = state->uart_port; |
2279 | port->ops->poll_put_char(port, ch); |
2280 | } |
2281 | #endif |
2282 | |
2283 | static const struct tty_operations uart_ops = { |
2284 | .open = uart_open, |
2285 | .close = uart_close, |
2286 | .write = uart_write, |
2287 | .put_char = uart_put_char, |
2288 | .flush_chars = uart_flush_chars, |
2289 | .write_room = uart_write_room, |
2290 | .chars_in_buffer= uart_chars_in_buffer, |
2291 | .flush_buffer = uart_flush_buffer, |
2292 | .ioctl = uart_ioctl, |
2293 | .throttle = uart_throttle, |
2294 | .unthrottle = uart_unthrottle, |
2295 | .send_xchar = uart_send_xchar, |
2296 | .set_termios = uart_set_termios, |
2297 | .set_ldisc = uart_set_ldisc, |
2298 | .stop = uart_stop, |
2299 | .start = uart_start, |
2300 | .hangup = uart_hangup, |
2301 | .break_ctl = uart_break_ctl, |
2302 | .wait_until_sent= uart_wait_until_sent, |
2303 | #ifdef CONFIG_PROC_FS |
2304 | .proc_fops = &uart_proc_fops, |
2305 | #endif |
2306 | .tiocmget = uart_tiocmget, |
2307 | .tiocmset = uart_tiocmset, |
2308 | #ifdef CONFIG_CONSOLE_POLL |
2309 | .poll_init = uart_poll_init, |
2310 | .poll_get_char = uart_poll_get_char, |
2311 | .poll_put_char = uart_poll_put_char, |
2312 | #endif |
2313 | }; |
2314 | |
2315 | /** |
2316 | * uart_register_driver - register a driver with the uart core layer |
2317 | * @drv: low level driver structure |
2318 | * |
2319 | * Register a uart driver with the core driver. We in turn register |
2320 | * with the tty layer, and initialise the core driver per-port state. |
2321 | * |
2322 | * We have a proc file in /proc/tty/driver which is named after the |
2323 | * normal driver. |
2324 | * |
2325 | * drv->port should be NULL, and the per-port structures should be |
2326 | * registered using uart_add_one_port after this call has succeeded. |
2327 | */ |
2328 | int uart_register_driver(struct uart_driver *drv) |
2329 | { |
2330 | struct tty_driver *normal; |
2331 | int i, retval; |
2332 | |
2333 | BUG_ON(drv->state); |
2334 | |
2335 | /* |
2336 | * Maybe we should be using a slab cache for this, especially if |
2337 | * we have a large number of ports to handle. |
2338 | */ |
2339 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
2340 | if (!drv->state) |
2341 | goto out; |
2342 | |
2343 | normal = alloc_tty_driver(drv->nr); |
2344 | if (!normal) |
2345 | goto out_kfree; |
2346 | |
2347 | drv->tty_driver = normal; |
2348 | |
2349 | normal->owner = drv->owner; |
2350 | normal->driver_name = drv->driver_name; |
2351 | normal->name = drv->dev_name; |
2352 | normal->major = drv->major; |
2353 | normal->minor_start = drv->minor; |
2354 | normal->type = TTY_DRIVER_TYPE_SERIAL; |
2355 | normal->subtype = SERIAL_TYPE_NORMAL; |
2356 | normal->init_termios = tty_std_termios; |
2357 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
2358 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
2359 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
2360 | normal->driver_state = drv; |
2361 | tty_set_operations(normal, &uart_ops); |
2362 | |
2363 | /* |
2364 | * Initialise the UART state(s). |
2365 | */ |
2366 | for (i = 0; i < drv->nr; i++) { |
2367 | struct uart_state *state = drv->state + i; |
2368 | struct tty_port *port = &state->port; |
2369 | |
2370 | tty_port_init(port); |
2371 | port->close_delay = 500; /* .5 seconds */ |
2372 | port->closing_wait = 30000; /* 30 seconds */ |
2373 | tasklet_init(&state->tlet, uart_tasklet_action, |
2374 | (unsigned long)state); |
2375 | } |
2376 | |
2377 | retval = tty_register_driver(normal); |
2378 | if (retval >= 0) |
2379 | return retval; |
2380 | |
2381 | put_tty_driver(normal); |
2382 | out_kfree: |
2383 | kfree(drv->state); |
2384 | out: |
2385 | return -ENOMEM; |
2386 | } |
2387 | |
2388 | /** |
2389 | * uart_unregister_driver - remove a driver from the uart core layer |
2390 | * @drv: low level driver structure |
2391 | * |
2392 | * Remove all references to a driver from the core driver. The low |
2393 | * level driver must have removed all its ports via the |
2394 | * uart_remove_one_port() if it registered them with uart_add_one_port(). |
2395 | * (ie, drv->port == NULL) |
2396 | */ |
2397 | void uart_unregister_driver(struct uart_driver *drv) |
2398 | { |
2399 | struct tty_driver *p = drv->tty_driver; |
2400 | tty_unregister_driver(p); |
2401 | put_tty_driver(p); |
2402 | kfree(drv->state); |
2403 | drv->tty_driver = NULL; |
2404 | } |
2405 | |
2406 | struct tty_driver *uart_console_device(struct console *co, int *index) |
2407 | { |
2408 | struct uart_driver *p = co->data; |
2409 | *index = co->index; |
2410 | return p->tty_driver; |
2411 | } |
2412 | |
2413 | /** |
2414 | * uart_add_one_port - attach a driver-defined port structure |
2415 | * @drv: pointer to the uart low level driver structure for this port |
2416 | * @uport: uart port structure to use for this port. |
2417 | * |
2418 | * This allows the driver to register its own uart_port structure |
2419 | * with the core driver. The main purpose is to allow the low |
2420 | * level uart drivers to expand uart_port, rather than having yet |
2421 | * more levels of structures. |
2422 | */ |
2423 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
2424 | { |
2425 | struct uart_state *state; |
2426 | struct tty_port *port; |
2427 | int ret = 0; |
2428 | struct device *tty_dev; |
2429 | |
2430 | BUG_ON(in_interrupt()); |
2431 | |
2432 | if (uport->line >= drv->nr) |
2433 | return -EINVAL; |
2434 | |
2435 | state = drv->state + uport->line; |
2436 | port = &state->port; |
2437 | |
2438 | mutex_lock(&port_mutex); |
2439 | mutex_lock(&port->mutex); |
2440 | if (state->uart_port) { |
2441 | ret = -EINVAL; |
2442 | goto out; |
2443 | } |
2444 | |
2445 | state->uart_port = uport; |
2446 | state->pm_state = -1; |
2447 | |
2448 | uport->cons = drv->cons; |
2449 | uport->state = state; |
2450 | |
2451 | /* |
2452 | * If this port is a console, then the spinlock is already |
2453 | * initialised. |
2454 | */ |
2455 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
2456 | spin_lock_init(&uport->lock); |
2457 | lockdep_set_class(&uport->lock, &port_lock_key); |
2458 | } |
2459 | |
2460 | uart_configure_port(drv, state, uport); |
2461 | |
2462 | /* |
2463 | * Register the port whether it's detected or not. This allows |
2464 | * setserial to be used to alter this ports parameters. |
2465 | */ |
2466 | tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev); |
2467 | if (likely(!IS_ERR(tty_dev))) { |
2468 | device_init_wakeup(tty_dev, 1); |
2469 | device_set_wakeup_enable(tty_dev, 0); |
2470 | } else |
2471 | printk(KERN_ERR "Cannot register tty device on line %d\n", |
2472 | uport->line); |
2473 | |
2474 | /* |
2475 | * Ensure UPF_DEAD is not set. |
2476 | */ |
2477 | uport->flags &= ~UPF_DEAD; |
2478 | |
2479 | out: |
2480 | mutex_unlock(&port->mutex); |
2481 | mutex_unlock(&port_mutex); |
2482 | |
2483 | return ret; |
2484 | } |
2485 | |
2486 | /** |
2487 | * uart_remove_one_port - detach a driver defined port structure |
2488 | * @drv: pointer to the uart low level driver structure for this port |
2489 | * @uport: uart port structure for this port |
2490 | * |
2491 | * This unhooks (and hangs up) the specified port structure from the |
2492 | * core driver. No further calls will be made to the low-level code |
2493 | * for this port. |
2494 | */ |
2495 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
2496 | { |
2497 | struct uart_state *state = drv->state + uport->line; |
2498 | struct tty_port *port = &state->port; |
2499 | |
2500 | BUG_ON(in_interrupt()); |
2501 | |
2502 | if (state->uart_port != uport) |
2503 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
2504 | state->uart_port, uport); |
2505 | |
2506 | mutex_lock(&port_mutex); |
2507 | |
2508 | /* |
2509 | * Mark the port "dead" - this prevents any opens from |
2510 | * succeeding while we shut down the port. |
2511 | */ |
2512 | mutex_lock(&port->mutex); |
2513 | uport->flags |= UPF_DEAD; |
2514 | mutex_unlock(&port->mutex); |
2515 | |
2516 | /* |
2517 | * Remove the devices from the tty layer |
2518 | */ |
2519 | tty_unregister_device(drv->tty_driver, uport->line); |
2520 | |
2521 | if (port->tty) |
2522 | tty_vhangup(port->tty); |
2523 | |
2524 | /* |
2525 | * Free the port IO and memory resources, if any. |
2526 | */ |
2527 | if (uport->type != PORT_UNKNOWN) |
2528 | uport->ops->release_port(uport); |
2529 | |
2530 | /* |
2531 | * Indicate that there isn't a port here anymore. |
2532 | */ |
2533 | uport->type = PORT_UNKNOWN; |
2534 | |
2535 | /* |
2536 | * Kill the tasklet, and free resources. |
2537 | */ |
2538 | tasklet_kill(&state->tlet); |
2539 | |
2540 | state->uart_port = NULL; |
2541 | mutex_unlock(&port_mutex); |
2542 | |
2543 | return 0; |
2544 | } |
2545 | |
2546 | /* |
2547 | * Are the two ports equivalent? |
2548 | */ |
2549 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) |
2550 | { |
2551 | if (port1->iotype != port2->iotype) |
2552 | return 0; |
2553 | |
2554 | switch (port1->iotype) { |
2555 | case UPIO_PORT: |
2556 | return (port1->iobase == port2->iobase); |
2557 | case UPIO_HUB6: |
2558 | return (port1->iobase == port2->iobase) && |
2559 | (port1->hub6 == port2->hub6); |
2560 | case UPIO_MEM: |
2561 | case UPIO_MEM32: |
2562 | case UPIO_AU: |
2563 | case UPIO_TSI: |
2564 | case UPIO_DWAPB: |
2565 | return (port1->mapbase == port2->mapbase); |
2566 | } |
2567 | return 0; |
2568 | } |
2569 | EXPORT_SYMBOL(uart_match_port); |
2570 | |
2571 | EXPORT_SYMBOL(uart_write_wakeup); |
2572 | EXPORT_SYMBOL(uart_register_driver); |
2573 | EXPORT_SYMBOL(uart_unregister_driver); |
2574 | EXPORT_SYMBOL(uart_suspend_port); |
2575 | EXPORT_SYMBOL(uart_resume_port); |
2576 | EXPORT_SYMBOL(uart_add_one_port); |
2577 | EXPORT_SYMBOL(uart_remove_one_port); |
2578 | |
2579 | MODULE_DESCRIPTION("Serial driver core"); |
2580 | MODULE_LICENSE("GPL"); |
2581 |
Branches:
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javiroman/ks7010
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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