Commit | Line | Data |
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1da177e4 LT |
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 | */ | |
1da177e4 LT |
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/serial_core.h> | |
31 | #include <linux/smp_lock.h> | |
32 | #include <linux/device.h> | |
33 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ | |
34 | #include <linux/delay.h> | |
f392ecfa | 35 | #include <linux/mutex.h> |
1da177e4 LT |
36 | |
37 | #include <asm/irq.h> | |
38 | #include <asm/uaccess.h> | |
39 | ||
1da177e4 LT |
40 | /* |
41 | * This is used to lock changes in serial line configuration. | |
42 | */ | |
f392ecfa | 43 | static DEFINE_MUTEX(port_mutex); |
1da177e4 | 44 | |
13e83599 IM |
45 | /* |
46 | * lockdep: port->lock is initialized in two places, but we | |
47 | * want only one lock-class: | |
48 | */ | |
49 | static struct lock_class_key port_lock_key; | |
50 | ||
1da177e4 LT |
51 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
52 | ||
53 | #define uart_users(state) ((state)->count + ((state)->info ? (state)->info->blocked_open : 0)) | |
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 | ||
a46c9994 AC |
61 | static void uart_change_speed(struct uart_state *state, |
62 | struct ktermios *old_termios); | |
1da177e4 LT |
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_info *info = port->info; | |
d5f735e5 PM |
73 | /* |
74 | * This means you called this function _after_ the port was | |
75 | * closed. No cookie for you. | |
76 | */ | |
77 | BUG_ON(!info); | |
1da177e4 LT |
78 | tasklet_schedule(&info->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->port; | |
85 | unsigned long flags; | |
86 | ||
87 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 88 | port->ops->stop_tx(port); |
1da177e4 LT |
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->port; | |
96 | ||
97 | if (!uart_circ_empty(&state->info->xmit) && state->info->xmit.buf && | |
98 | !tty->stopped && !tty->hw_stopped) | |
b129a8cc | 99 | port->ops->start_tx(port); |
1da177e4 LT |
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->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->info->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 | ||
a46c9994 AC |
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) | |
1da177e4 LT |
135 | |
136 | /* | |
137 | * Startup the port. This will be called once per open. All calls | |
138 | * will be serialised by the per-port semaphore. | |
139 | */ | |
140 | static int uart_startup(struct uart_state *state, int init_hw) | |
141 | { | |
142 | struct uart_info *info = state->info; | |
143 | struct uart_port *port = state->port; | |
144 | unsigned long page; | |
145 | int retval = 0; | |
146 | ||
147 | if (info->flags & UIF_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 | */ | |
a2436b22 | 155 | set_bit(TTY_IO_ERROR, &info->tty->flags); |
1da177e4 LT |
156 | |
157 | if (port->type == PORT_UNKNOWN) | |
158 | return 0; | |
159 | ||
160 | /* | |
161 | * Initialise and allocate the transmit and temporary | |
162 | * buffer. | |
163 | */ | |
164 | if (!info->xmit.buf) { | |
165 | page = get_zeroed_page(GFP_KERNEL); | |
166 | if (!page) | |
167 | return -ENOMEM; | |
168 | ||
169 | info->xmit.buf = (unsigned char *) page; | |
170 | uart_circ_clear(&info->xmit); | |
171 | } | |
172 | ||
173 | retval = port->ops->startup(port); | |
174 | if (retval == 0) { | |
175 | if (init_hw) { | |
176 | /* | |
177 | * Initialise the hardware port settings. | |
178 | */ | |
179 | uart_change_speed(state, NULL); | |
180 | ||
181 | /* | |
182 | * Setup the RTS and DTR signals once the | |
183 | * port is open and ready to respond. | |
184 | */ | |
185 | if (info->tty->termios->c_cflag & CBAUD) | |
186 | uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); | |
187 | } | |
188 | ||
0dd7a1ae RK |
189 | if (info->flags & UIF_CTS_FLOW) { |
190 | spin_lock_irq(&port->lock); | |
191 | if (!(port->ops->get_mctrl(port) & TIOCM_CTS)) | |
192 | info->tty->hw_stopped = 1; | |
193 | spin_unlock_irq(&port->lock); | |
194 | } | |
195 | ||
1da177e4 LT |
196 | info->flags |= UIF_INITIALIZED; |
197 | ||
198 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
199 | } | |
200 | ||
201 | if (retval && capable(CAP_SYS_ADMIN)) | |
202 | retval = 0; | |
203 | ||
204 | return retval; | |
205 | } | |
206 | ||
207 | /* | |
208 | * This routine will shutdown a serial port; interrupts are disabled, and | |
209 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
210 | * uart_shutdown are serialised by the per-port semaphore. | |
211 | */ | |
212 | static void uart_shutdown(struct uart_state *state) | |
213 | { | |
214 | struct uart_info *info = state->info; | |
215 | struct uart_port *port = state->port; | |
216 | ||
1da177e4 | 217 | /* |
ee31b337 | 218 | * Set the TTY IO error marker |
1da177e4 | 219 | */ |
ee31b337 RK |
220 | if (info->tty) |
221 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
1da177e4 | 222 | |
ee31b337 RK |
223 | if (info->flags & UIF_INITIALIZED) { |
224 | info->flags &= ~UIF_INITIALIZED; | |
1da177e4 | 225 | |
ee31b337 RK |
226 | /* |
227 | * Turn off DTR and RTS early. | |
228 | */ | |
229 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) | |
230 | uart_clear_mctrl(port, 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(&info->delta_msr_wait); | |
240 | ||
241 | /* | |
242 | * Free the IRQ and disable the port. | |
243 | */ | |
244 | port->ops->shutdown(port); | |
245 | ||
246 | /* | |
247 | * Ensure that the IRQ handler isn't running on another CPU. | |
248 | */ | |
249 | synchronize_irq(port->irq); | |
250 | } | |
1da177e4 LT |
251 | |
252 | /* | |
ee31b337 | 253 | * kill off our tasklet |
1da177e4 | 254 | */ |
ee31b337 | 255 | tasklet_kill(&info->tlet); |
1da177e4 LT |
256 | |
257 | /* | |
258 | * Free the transmit buffer page. | |
259 | */ | |
260 | if (info->xmit.buf) { | |
261 | free_page((unsigned long)info->xmit.buf); | |
262 | info->xmit.buf = NULL; | |
263 | } | |
1da177e4 LT |
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; | |
a46c9994 | 294 | break; /* CS8 */ |
1da177e4 LT |
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 | |
eb424fd2 AC |
332 | * we're actually going to be using. Don't do this for the case |
333 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
334 | */ |
335 | unsigned int | |
606d099c AC |
336 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
337 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
338 | { |
339 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 340 | int hung_up = 0; |
0077d45e | 341 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
342 | |
343 | if (flags == UPF_SPD_HI) | |
344 | altbaud = 57600; | |
345 | if (flags == UPF_SPD_VHI) | |
346 | altbaud = 115200; | |
347 | if (flags == UPF_SPD_SHI) | |
348 | altbaud = 230400; | |
349 | 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 | */ | |
eb424fd2 AC |
365 | if (baud == 0) { |
366 | hung_up = 1; | |
1da177e4 | 367 | baud = 9600; |
eb424fd2 | 368 | } |
1da177e4 LT |
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) { | |
6d4d67be | 379 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
380 | if (!hung_up) |
381 | tty_termios_encode_baud_rate(termios, | |
382 | baud, baud); | |
1da177e4 LT |
383 | old = NULL; |
384 | continue; | |
385 | } | |
386 | ||
387 | /* | |
388 | * As a last resort, if the quotient is zero, | |
389 | * default to 9600 bps | |
390 | */ | |
eb424fd2 AC |
391 | if (!hung_up) |
392 | tty_termios_encode_baud_rate(termios, 9600, 9600); | |
1da177e4 LT |
393 | } |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | EXPORT_SYMBOL(uart_get_baud_rate); | |
399 | ||
400 | /** | |
401 | * uart_get_divisor - return uart clock divisor | |
402 | * @port: uart_port structure describing the port. | |
403 | * @baud: desired baud rate | |
404 | * | |
405 | * Calculate the uart clock divisor for the port. | |
406 | */ | |
407 | unsigned int | |
408 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
409 | { | |
410 | unsigned int quot; | |
411 | ||
412 | /* | |
413 | * Old custom speed handling. | |
414 | */ | |
415 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
416 | quot = port->custom_divisor; | |
417 | else | |
418 | quot = (port->uartclk + (8 * baud)) / (16 * baud); | |
419 | ||
420 | return quot; | |
421 | } | |
422 | ||
423 | EXPORT_SYMBOL(uart_get_divisor); | |
424 | ||
23d22cea | 425 | /* FIXME: Consistent locking policy */ |
1da177e4 | 426 | static void |
606d099c | 427 | uart_change_speed(struct uart_state *state, struct ktermios *old_termios) |
1da177e4 LT |
428 | { |
429 | struct tty_struct *tty = state->info->tty; | |
430 | struct uart_port *port = state->port; | |
606d099c | 431 | struct ktermios *termios; |
1da177e4 LT |
432 | |
433 | /* | |
434 | * If we have no tty, termios, or the port does not exist, | |
435 | * then we can't set the parameters for this port. | |
436 | */ | |
437 | if (!tty || !tty->termios || port->type == PORT_UNKNOWN) | |
438 | return; | |
439 | ||
440 | termios = tty->termios; | |
441 | ||
442 | /* | |
443 | * Set flags based on termios cflag | |
444 | */ | |
445 | if (termios->c_cflag & CRTSCTS) | |
446 | state->info->flags |= UIF_CTS_FLOW; | |
447 | else | |
448 | state->info->flags &= ~UIF_CTS_FLOW; | |
449 | ||
450 | if (termios->c_cflag & CLOCAL) | |
451 | state->info->flags &= ~UIF_CHECK_CD; | |
452 | else | |
453 | state->info->flags |= UIF_CHECK_CD; | |
454 | ||
455 | port->ops->set_termios(port, termios, old_termios); | |
456 | } | |
457 | ||
23d22cea | 458 | static inline int |
1da177e4 LT |
459 | __uart_put_char(struct uart_port *port, struct circ_buf *circ, unsigned char c) |
460 | { | |
461 | unsigned long flags; | |
23d22cea | 462 | int ret = 0; |
1da177e4 LT |
463 | |
464 | if (!circ->buf) | |
23d22cea | 465 | return 0; |
1da177e4 LT |
466 | |
467 | spin_lock_irqsave(&port->lock, flags); | |
468 | if (uart_circ_chars_free(circ) != 0) { | |
469 | circ->buf[circ->head] = c; | |
470 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 471 | ret = 1; |
1da177e4 LT |
472 | } |
473 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 474 | return ret; |
1da177e4 LT |
475 | } |
476 | ||
23d22cea | 477 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
478 | { |
479 | struct uart_state *state = tty->driver_data; | |
480 | ||
23d22cea | 481 | return __uart_put_char(state->port, &state->info->xmit, ch); |
1da177e4 LT |
482 | } |
483 | ||
484 | static void uart_flush_chars(struct tty_struct *tty) | |
485 | { | |
486 | uart_start(tty); | |
487 | } | |
488 | ||
489 | static int | |
d5f735e5 | 490 | uart_write(struct tty_struct *tty, const unsigned char *buf, int count) |
1da177e4 LT |
491 | { |
492 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
493 | struct uart_port *port; |
494 | struct circ_buf *circ; | |
1da177e4 LT |
495 | unsigned long flags; |
496 | int c, ret = 0; | |
497 | ||
d5f735e5 PM |
498 | /* |
499 | * This means you called this function _after_ the port was | |
500 | * closed. No cookie for you. | |
501 | */ | |
502 | if (!state || !state->info) { | |
503 | WARN_ON(1); | |
504 | return -EL3HLT; | |
505 | } | |
506 | ||
507 | port = state->port; | |
508 | circ = &state->info->xmit; | |
509 | ||
1da177e4 LT |
510 | if (!circ->buf) |
511 | return 0; | |
512 | ||
513 | spin_lock_irqsave(&port->lock, flags); | |
514 | while (1) { | |
515 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
516 | if (count < c) | |
517 | c = count; | |
518 | if (c <= 0) | |
519 | break; | |
520 | memcpy(circ->buf + circ->head, buf, c); | |
521 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
522 | buf += c; | |
523 | count -= c; | |
524 | ret += c; | |
525 | } | |
526 | spin_unlock_irqrestore(&port->lock, flags); | |
527 | ||
528 | uart_start(tty); | |
529 | return ret; | |
530 | } | |
531 | ||
532 | static int uart_write_room(struct tty_struct *tty) | |
533 | { | |
534 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
535 | unsigned long flags; |
536 | int ret; | |
1da177e4 | 537 | |
f34d7a5b AC |
538 | spin_lock_irqsave(&state->port->lock, flags); |
539 | ret = uart_circ_chars_free(&state->info->xmit); | |
540 | spin_unlock_irqrestore(&state->port->lock, flags); | |
541 | return ret; | |
1da177e4 LT |
542 | } |
543 | ||
544 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
545 | { | |
546 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
547 | unsigned long flags; |
548 | int ret; | |
1da177e4 | 549 | |
f34d7a5b AC |
550 | spin_lock_irqsave(&state->port->lock, flags); |
551 | ret = uart_circ_chars_pending(&state->info->xmit); | |
552 | spin_unlock_irqrestore(&state->port->lock, flags); | |
553 | return ret; | |
1da177e4 LT |
554 | } |
555 | ||
556 | static void uart_flush_buffer(struct tty_struct *tty) | |
557 | { | |
558 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 559 | struct uart_port *port; |
1da177e4 LT |
560 | unsigned long flags; |
561 | ||
d5f735e5 PM |
562 | /* |
563 | * This means you called this function _after_ the port was | |
564 | * closed. No cookie for you. | |
565 | */ | |
566 | if (!state || !state->info) { | |
567 | WARN_ON(1); | |
568 | return; | |
569 | } | |
570 | ||
55d7b689 | 571 | port = state->port; |
eb3a1e11 | 572 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
573 | |
574 | spin_lock_irqsave(&port->lock, flags); | |
575 | uart_circ_clear(&state->info->xmit); | |
576 | spin_unlock_irqrestore(&port->lock, flags); | |
577 | tty_wakeup(tty); | |
578 | } | |
579 | ||
580 | /* | |
581 | * This function is used to send a high-priority XON/XOFF character to | |
582 | * the device | |
583 | */ | |
584 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
585 | { | |
586 | struct uart_state *state = tty->driver_data; | |
587 | struct uart_port *port = state->port; | |
588 | unsigned long flags; | |
589 | ||
590 | if (port->ops->send_xchar) | |
591 | port->ops->send_xchar(port, ch); | |
592 | else { | |
593 | port->x_char = ch; | |
594 | if (ch) { | |
595 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 596 | port->ops->start_tx(port); |
1da177e4 LT |
597 | spin_unlock_irqrestore(&port->lock, flags); |
598 | } | |
599 | } | |
600 | } | |
601 | ||
602 | static void uart_throttle(struct tty_struct *tty) | |
603 | { | |
604 | struct uart_state *state = tty->driver_data; | |
605 | ||
606 | if (I_IXOFF(tty)) | |
607 | uart_send_xchar(tty, STOP_CHAR(tty)); | |
608 | ||
609 | if (tty->termios->c_cflag & CRTSCTS) | |
610 | uart_clear_mctrl(state->port, TIOCM_RTS); | |
611 | } | |
612 | ||
613 | static void uart_unthrottle(struct tty_struct *tty) | |
614 | { | |
615 | struct uart_state *state = tty->driver_data; | |
616 | struct uart_port *port = state->port; | |
617 | ||
618 | if (I_IXOFF(tty)) { | |
619 | if (port->x_char) | |
620 | port->x_char = 0; | |
621 | else | |
622 | uart_send_xchar(tty, START_CHAR(tty)); | |
623 | } | |
624 | ||
625 | if (tty->termios->c_cflag & CRTSCTS) | |
626 | uart_set_mctrl(port, TIOCM_RTS); | |
627 | } | |
628 | ||
629 | static int uart_get_info(struct uart_state *state, | |
630 | struct serial_struct __user *retinfo) | |
631 | { | |
632 | struct uart_port *port = state->port; | |
633 | struct serial_struct tmp; | |
634 | ||
635 | memset(&tmp, 0, sizeof(tmp)); | |
f34d7a5b AC |
636 | |
637 | /* Ensure the state we copy is consistent and no hardware changes | |
638 | occur as we go */ | |
639 | mutex_lock(&state->mutex); | |
640 | ||
1da177e4 LT |
641 | tmp.type = port->type; |
642 | tmp.line = port->line; | |
643 | tmp.port = port->iobase; | |
644 | if (HIGH_BITS_OFFSET) | |
645 | tmp.port_high = (long) port->iobase >> HIGH_BITS_OFFSET; | |
646 | tmp.irq = port->irq; | |
647 | tmp.flags = port->flags; | |
648 | tmp.xmit_fifo_size = port->fifosize; | |
649 | tmp.baud_base = port->uartclk / 16; | |
650 | tmp.close_delay = state->close_delay / 10; | |
651 | tmp.closing_wait = state->closing_wait == USF_CLOSING_WAIT_NONE ? | |
652 | ASYNC_CLOSING_WAIT_NONE : | |
a46c9994 | 653 | state->closing_wait / 10; |
1da177e4 LT |
654 | tmp.custom_divisor = port->custom_divisor; |
655 | tmp.hub6 = port->hub6; | |
656 | tmp.io_type = port->iotype; | |
657 | tmp.iomem_reg_shift = port->regshift; | |
4f640efb | 658 | tmp.iomem_base = (void *)(unsigned long)port->mapbase; |
1da177e4 | 659 | |
f34d7a5b AC |
660 | mutex_unlock(&state->mutex); |
661 | ||
1da177e4 LT |
662 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
663 | return -EFAULT; | |
664 | return 0; | |
665 | } | |
666 | ||
667 | static int uart_set_info(struct uart_state *state, | |
668 | struct serial_struct __user *newinfo) | |
669 | { | |
670 | struct serial_struct new_serial; | |
671 | struct uart_port *port = state->port; | |
672 | unsigned long new_port; | |
0077d45e | 673 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 674 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 675 | upf_t old_flags, new_flags; |
1da177e4 LT |
676 | int retval = 0; |
677 | ||
678 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
679 | return -EFAULT; | |
680 | ||
681 | new_port = new_serial.port; | |
682 | if (HIGH_BITS_OFFSET) | |
683 | new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; | |
684 | ||
685 | new_serial.irq = irq_canonicalize(new_serial.irq); | |
686 | close_delay = new_serial.close_delay * 10; | |
687 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
688 | USF_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; | |
689 | ||
690 | /* | |
691 | * This semaphore protects state->count. It is also | |
692 | * very useful to prevent opens. Also, take the | |
693 | * port configuration semaphore to make sure that a | |
694 | * module insertion/removal doesn't change anything | |
695 | * under us. | |
696 | */ | |
e2862f6a | 697 | mutex_lock(&state->mutex); |
1da177e4 | 698 | |
abb4a239 DG |
699 | change_irq = !(port->flags & UPF_FIXED_PORT) |
700 | && new_serial.irq != port->irq; | |
1da177e4 LT |
701 | |
702 | /* | |
703 | * Since changing the 'type' of the port changes its resource | |
704 | * allocations, we should treat type changes the same as | |
705 | * IO port changes. | |
706 | */ | |
abb4a239 DG |
707 | change_port = !(port->flags & UPF_FIXED_PORT) |
708 | && (new_port != port->iobase || | |
709 | (unsigned long)new_serial.iomem_base != port->mapbase || | |
710 | new_serial.hub6 != port->hub6 || | |
711 | new_serial.io_type != port->iotype || | |
712 | new_serial.iomem_reg_shift != port->regshift || | |
713 | new_serial.type != port->type); | |
1da177e4 LT |
714 | |
715 | old_flags = port->flags; | |
0077d45e | 716 | new_flags = new_serial.flags; |
1da177e4 LT |
717 | old_custom_divisor = port->custom_divisor; |
718 | ||
719 | if (!capable(CAP_SYS_ADMIN)) { | |
720 | retval = -EPERM; | |
721 | if (change_irq || change_port || | |
722 | (new_serial.baud_base != port->uartclk / 16) || | |
723 | (close_delay != state->close_delay) || | |
724 | (closing_wait != state->closing_wait) || | |
947deee8 RK |
725 | (new_serial.xmit_fifo_size && |
726 | new_serial.xmit_fifo_size != port->fifosize) || | |
0077d45e | 727 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 LT |
728 | goto exit; |
729 | port->flags = ((port->flags & ~UPF_USR_MASK) | | |
0077d45e | 730 | (new_flags & UPF_USR_MASK)); |
1da177e4 LT |
731 | port->custom_divisor = new_serial.custom_divisor; |
732 | goto check_and_exit; | |
733 | } | |
734 | ||
735 | /* | |
736 | * Ask the low level driver to verify the settings. | |
737 | */ | |
738 | if (port->ops->verify_port) | |
739 | retval = port->ops->verify_port(port, &new_serial); | |
740 | ||
741 | if ((new_serial.irq >= NR_IRQS) || (new_serial.irq < 0) || | |
742 | (new_serial.baud_base < 9600)) | |
743 | retval = -EINVAL; | |
744 | ||
745 | if (retval) | |
746 | goto exit; | |
747 | ||
748 | if (change_port || change_irq) { | |
749 | retval = -EBUSY; | |
750 | ||
751 | /* | |
752 | * Make sure that we are the sole user of this port. | |
753 | */ | |
754 | if (uart_users(state) > 1) | |
755 | goto exit; | |
756 | ||
757 | /* | |
758 | * We need to shutdown the serial port at the old | |
759 | * port/type/irq combination. | |
760 | */ | |
761 | uart_shutdown(state); | |
762 | } | |
763 | ||
764 | if (change_port) { | |
765 | unsigned long old_iobase, old_mapbase; | |
766 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
767 | ||
768 | old_iobase = port->iobase; | |
769 | old_mapbase = port->mapbase; | |
770 | old_type = port->type; | |
771 | old_hub6 = port->hub6; | |
772 | old_iotype = port->iotype; | |
773 | old_shift = port->regshift; | |
774 | ||
775 | /* | |
776 | * Free and release old regions | |
777 | */ | |
778 | if (old_type != PORT_UNKNOWN) | |
779 | port->ops->release_port(port); | |
780 | ||
781 | port->iobase = new_port; | |
782 | port->type = new_serial.type; | |
783 | port->hub6 = new_serial.hub6; | |
784 | port->iotype = new_serial.io_type; | |
785 | port->regshift = new_serial.iomem_reg_shift; | |
786 | port->mapbase = (unsigned long)new_serial.iomem_base; | |
787 | ||
788 | /* | |
789 | * Claim and map the new regions | |
790 | */ | |
791 | if (port->type != PORT_UNKNOWN) { | |
792 | retval = port->ops->request_port(port); | |
793 | } else { | |
794 | /* Always success - Jean II */ | |
795 | retval = 0; | |
796 | } | |
797 | ||
798 | /* | |
799 | * If we fail to request resources for the | |
800 | * new port, try to restore the old settings. | |
801 | */ | |
802 | if (retval && old_type != PORT_UNKNOWN) { | |
803 | port->iobase = old_iobase; | |
804 | port->type = old_type; | |
805 | port->hub6 = old_hub6; | |
806 | port->iotype = old_iotype; | |
807 | port->regshift = old_shift; | |
808 | port->mapbase = old_mapbase; | |
809 | retval = port->ops->request_port(port); | |
810 | /* | |
811 | * If we failed to restore the old settings, | |
812 | * we fail like this. | |
813 | */ | |
814 | if (retval) | |
815 | port->type = PORT_UNKNOWN; | |
816 | ||
817 | /* | |
818 | * We failed anyway. | |
819 | */ | |
820 | retval = -EBUSY; | |
a46c9994 AC |
821 | /* Added to return the correct error -Ram Gupta */ |
822 | goto exit; | |
1da177e4 LT |
823 | } |
824 | } | |
825 | ||
abb4a239 DG |
826 | if (change_irq) |
827 | port->irq = new_serial.irq; | |
828 | if (!(port->flags & UPF_FIXED_PORT)) | |
829 | port->uartclk = new_serial.baud_base * 16; | |
1da177e4 | 830 | port->flags = (port->flags & ~UPF_CHANGE_MASK) | |
0077d45e | 831 | (new_flags & UPF_CHANGE_MASK); |
1da177e4 LT |
832 | port->custom_divisor = new_serial.custom_divisor; |
833 | state->close_delay = close_delay; | |
834 | state->closing_wait = closing_wait; | |
947deee8 RK |
835 | if (new_serial.xmit_fifo_size) |
836 | port->fifosize = new_serial.xmit_fifo_size; | |
1da177e4 LT |
837 | if (state->info->tty) |
838 | state->info->tty->low_latency = | |
839 | (port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
840 | ||
841 | check_and_exit: | |
842 | retval = 0; | |
843 | if (port->type == PORT_UNKNOWN) | |
844 | goto exit; | |
845 | if (state->info->flags & UIF_INITIALIZED) { | |
846 | if (((old_flags ^ port->flags) & UPF_SPD_MASK) || | |
847 | old_custom_divisor != port->custom_divisor) { | |
848 | /* | |
849 | * If they're setting up a custom divisor or speed, | |
850 | * instead of clearing it, then bitch about it. No | |
851 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
852 | */ | |
853 | if (port->flags & UPF_SPD_MASK) { | |
854 | char buf[64]; | |
855 | printk(KERN_NOTICE | |
856 | "%s sets custom speed on %s. This " | |
857 | "is deprecated.\n", current->comm, | |
858 | tty_name(state->info->tty, buf)); | |
859 | } | |
860 | uart_change_speed(state, NULL); | |
861 | } | |
862 | } else | |
863 | retval = uart_startup(state, 1); | |
864 | exit: | |
e2862f6a | 865 | mutex_unlock(&state->mutex); |
1da177e4 LT |
866 | return retval; |
867 | } | |
868 | ||
869 | ||
870 | /* | |
871 | * uart_get_lsr_info - get line status register info. | |
872 | * Note: uart_ioctl protects us against hangups. | |
873 | */ | |
874 | static int uart_get_lsr_info(struct uart_state *state, | |
875 | unsigned int __user *value) | |
876 | { | |
877 | struct uart_port *port = state->port; | |
878 | unsigned int result; | |
879 | ||
880 | result = port->ops->tx_empty(port); | |
881 | ||
882 | /* | |
883 | * If we're about to load something into the transmit | |
884 | * register, we'll pretend the transmitter isn't empty to | |
885 | * avoid a race condition (depending on when the transmit | |
886 | * interrupt happens). | |
887 | */ | |
888 | if (port->x_char || | |
889 | ((uart_circ_chars_pending(&state->info->xmit) > 0) && | |
890 | !state->info->tty->stopped && !state->info->tty->hw_stopped)) | |
891 | result &= ~TIOCSER_TEMT; | |
a46c9994 | 892 | |
1da177e4 LT |
893 | return put_user(result, value); |
894 | } | |
895 | ||
896 | static int uart_tiocmget(struct tty_struct *tty, struct file *file) | |
897 | { | |
898 | struct uart_state *state = tty->driver_data; | |
899 | struct uart_port *port = state->port; | |
900 | int result = -EIO; | |
901 | ||
e2862f6a | 902 | mutex_lock(&state->mutex); |
1da177e4 LT |
903 | if ((!file || !tty_hung_up_p(file)) && |
904 | !(tty->flags & (1 << TTY_IO_ERROR))) { | |
905 | result = port->mctrl; | |
c5f4644e RK |
906 | |
907 | spin_lock_irq(&port->lock); | |
1da177e4 | 908 | result |= port->ops->get_mctrl(port); |
c5f4644e | 909 | spin_unlock_irq(&port->lock); |
1da177e4 | 910 | } |
e2862f6a | 911 | mutex_unlock(&state->mutex); |
1da177e4 LT |
912 | |
913 | return result; | |
914 | } | |
915 | ||
916 | static int | |
917 | uart_tiocmset(struct tty_struct *tty, struct file *file, | |
918 | unsigned int set, unsigned int clear) | |
919 | { | |
920 | struct uart_state *state = tty->driver_data; | |
921 | struct uart_port *port = state->port; | |
922 | int ret = -EIO; | |
923 | ||
e2862f6a | 924 | mutex_lock(&state->mutex); |
1da177e4 LT |
925 | if ((!file || !tty_hung_up_p(file)) && |
926 | !(tty->flags & (1 << TTY_IO_ERROR))) { | |
927 | uart_update_mctrl(port, set, clear); | |
928 | ret = 0; | |
929 | } | |
e2862f6a | 930 | mutex_unlock(&state->mutex); |
1da177e4 LT |
931 | return ret; |
932 | } | |
933 | ||
934 | static void uart_break_ctl(struct tty_struct *tty, int break_state) | |
935 | { | |
936 | struct uart_state *state = tty->driver_data; | |
937 | struct uart_port *port = state->port; | |
938 | ||
e2862f6a | 939 | mutex_lock(&state->mutex); |
1da177e4 LT |
940 | |
941 | if (port->type != PORT_UNKNOWN) | |
942 | port->ops->break_ctl(port, break_state); | |
943 | ||
e2862f6a | 944 | mutex_unlock(&state->mutex); |
1da177e4 LT |
945 | } |
946 | ||
947 | static int uart_do_autoconfig(struct uart_state *state) | |
948 | { | |
949 | struct uart_port *port = state->port; | |
950 | int flags, ret; | |
951 | ||
952 | if (!capable(CAP_SYS_ADMIN)) | |
953 | return -EPERM; | |
954 | ||
955 | /* | |
956 | * Take the per-port semaphore. This prevents count from | |
957 | * changing, and hence any extra opens of the port while | |
958 | * we're auto-configuring. | |
959 | */ | |
e2862f6a | 960 | if (mutex_lock_interruptible(&state->mutex)) |
1da177e4 LT |
961 | return -ERESTARTSYS; |
962 | ||
963 | ret = -EBUSY; | |
964 | if (uart_users(state) == 1) { | |
965 | uart_shutdown(state); | |
966 | ||
967 | /* | |
968 | * If we already have a port type configured, | |
969 | * we must release its resources. | |
970 | */ | |
971 | if (port->type != PORT_UNKNOWN) | |
972 | port->ops->release_port(port); | |
973 | ||
974 | flags = UART_CONFIG_TYPE; | |
975 | if (port->flags & UPF_AUTO_IRQ) | |
976 | flags |= UART_CONFIG_IRQ; | |
977 | ||
978 | /* | |
979 | * This will claim the ports resources if | |
980 | * a port is found. | |
981 | */ | |
982 | port->ops->config_port(port, flags); | |
983 | ||
984 | ret = uart_startup(state, 1); | |
985 | } | |
e2862f6a | 986 | mutex_unlock(&state->mutex); |
1da177e4 LT |
987 | return ret; |
988 | } | |
989 | ||
990 | /* | |
991 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
992 | * - mask passed in arg for lines of interest | |
993 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
994 | * Caller should use TIOCGICOUNT to see which one it was | |
995 | */ | |
996 | static int | |
997 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
998 | { | |
999 | struct uart_port *port = state->port; | |
1000 | DECLARE_WAITQUEUE(wait, current); | |
1001 | struct uart_icount cprev, cnow; | |
1002 | int ret; | |
1003 | ||
1004 | /* | |
1005 | * note the counters on entry | |
1006 | */ | |
1007 | spin_lock_irq(&port->lock); | |
1008 | memcpy(&cprev, &port->icount, sizeof(struct uart_icount)); | |
1009 | ||
1010 | /* | |
1011 | * Force modem status interrupts on | |
1012 | */ | |
1013 | port->ops->enable_ms(port); | |
1014 | spin_unlock_irq(&port->lock); | |
1015 | ||
1016 | add_wait_queue(&state->info->delta_msr_wait, &wait); | |
1017 | for (;;) { | |
1018 | spin_lock_irq(&port->lock); | |
1019 | memcpy(&cnow, &port->icount, sizeof(struct uart_icount)); | |
1020 | spin_unlock_irq(&port->lock); | |
1021 | ||
1022 | set_current_state(TASK_INTERRUPTIBLE); | |
1023 | ||
1024 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1025 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1026 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1027 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1028 | ret = 0; |
1029 | break; | |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | schedule(); | |
1033 | ||
1034 | /* see if a signal did it */ | |
1035 | if (signal_pending(current)) { | |
1036 | ret = -ERESTARTSYS; | |
1037 | break; | |
1038 | } | |
1039 | ||
1040 | cprev = cnow; | |
1041 | } | |
1042 | ||
1043 | current->state = TASK_RUNNING; | |
1044 | remove_wait_queue(&state->info->delta_msr_wait, &wait); | |
1045 | ||
1046 | return ret; | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1051 | * Return: write counters to the user passed counter struct | |
1052 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1053 | * RI where only 0->1 is counted. | |
1054 | */ | |
1055 | static int uart_get_count(struct uart_state *state, | |
1056 | struct serial_icounter_struct __user *icnt) | |
1057 | { | |
1058 | struct serial_icounter_struct icount; | |
1059 | struct uart_icount cnow; | |
1060 | struct uart_port *port = state->port; | |
1061 | ||
1062 | spin_lock_irq(&port->lock); | |
1063 | memcpy(&cnow, &port->icount, sizeof(struct uart_icount)); | |
1064 | spin_unlock_irq(&port->lock); | |
1065 | ||
1066 | icount.cts = cnow.cts; | |
1067 | icount.dsr = cnow.dsr; | |
1068 | icount.rng = cnow.rng; | |
1069 | icount.dcd = cnow.dcd; | |
1070 | icount.rx = cnow.rx; | |
1071 | icount.tx = cnow.tx; | |
1072 | icount.frame = cnow.frame; | |
1073 | icount.overrun = cnow.overrun; | |
1074 | icount.parity = cnow.parity; | |
1075 | icount.brk = cnow.brk; | |
1076 | icount.buf_overrun = cnow.buf_overrun; | |
1077 | ||
1078 | return copy_to_user(icnt, &icount, sizeof(icount)) ? -EFAULT : 0; | |
1079 | } | |
1080 | ||
1081 | /* | |
e5238442 | 1082 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1083 | */ |
1084 | static int | |
1085 | uart_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, | |
1086 | unsigned long arg) | |
1087 | { | |
1088 | struct uart_state *state = tty->driver_data; | |
1089 | void __user *uarg = (void __user *)arg; | |
1090 | int ret = -ENOIOCTLCMD; | |
1091 | ||
1da177e4 LT |
1092 | |
1093 | /* | |
1094 | * These ioctls don't rely on the hardware to be present. | |
1095 | */ | |
1096 | switch (cmd) { | |
1097 | case TIOCGSERIAL: | |
1098 | ret = uart_get_info(state, uarg); | |
1099 | break; | |
1100 | ||
1101 | case TIOCSSERIAL: | |
1102 | ret = uart_set_info(state, uarg); | |
1103 | break; | |
1104 | ||
1105 | case TIOCSERCONFIG: | |
1106 | ret = uart_do_autoconfig(state); | |
1107 | break; | |
1108 | ||
1109 | case TIOCSERGWILD: /* obsolete */ | |
1110 | case TIOCSERSWILD: /* obsolete */ | |
1111 | ret = 0; | |
1112 | break; | |
1113 | } | |
1114 | ||
1115 | if (ret != -ENOIOCTLCMD) | |
1116 | goto out; | |
1117 | ||
1118 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1119 | ret = -EIO; | |
1120 | goto out; | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * The following should only be used when hardware is present. | |
1125 | */ | |
1126 | switch (cmd) { | |
1127 | case TIOCMIWAIT: | |
1128 | ret = uart_wait_modem_status(state, arg); | |
1129 | break; | |
1130 | ||
1131 | case TIOCGICOUNT: | |
1132 | ret = uart_get_count(state, uarg); | |
1133 | break; | |
1134 | } | |
1135 | ||
1136 | if (ret != -ENOIOCTLCMD) | |
1137 | goto out; | |
1138 | ||
e2862f6a | 1139 | mutex_lock(&state->mutex); |
1da177e4 LT |
1140 | |
1141 | if (tty_hung_up_p(filp)) { | |
1142 | ret = -EIO; | |
1143 | goto out_up; | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * All these rely on hardware being present and need to be | |
1148 | * protected against the tty being hung up. | |
1149 | */ | |
1150 | switch (cmd) { | |
1151 | case TIOCSERGETLSR: /* Get line status register */ | |
1152 | ret = uart_get_lsr_info(state, uarg); | |
1153 | break; | |
1154 | ||
1155 | default: { | |
1156 | struct uart_port *port = state->port; | |
1157 | if (port->ops->ioctl) | |
1158 | ret = port->ops->ioctl(port, cmd, arg); | |
1159 | break; | |
1160 | } | |
1161 | } | |
f34d7a5b | 1162 | out_up: |
e2862f6a | 1163 | mutex_unlock(&state->mutex); |
f34d7a5b | 1164 | out: |
1da177e4 LT |
1165 | return ret; |
1166 | } | |
1167 | ||
64e9159f AC |
1168 | static void uart_set_ldisc(struct tty_struct *tty, int ldisc) |
1169 | { | |
1170 | struct uart_state *state = tty->driver_data; | |
1171 | struct uart_port *port = state->port; | |
1172 | ||
1173 | if (port->ops->set_ldisc) | |
1174 | port->ops->set_ldisc(port); | |
1175 | } | |
1176 | ||
a46c9994 AC |
1177 | static void uart_set_termios(struct tty_struct *tty, |
1178 | struct ktermios *old_termios) | |
1da177e4 LT |
1179 | { |
1180 | struct uart_state *state = tty->driver_data; | |
1181 | unsigned long flags; | |
1182 | unsigned int cflag = tty->termios->c_cflag; | |
1183 | ||
1da177e4 LT |
1184 | |
1185 | /* | |
1186 | * These are the bits that are used to setup various | |
20620d68 DW |
1187 | * flags in the low level driver. We can ignore the Bfoo |
1188 | * bits in c_cflag; c_[io]speed will always be set | |
1189 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 LT |
1190 | */ |
1191 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
1da177e4 | 1192 | if ((cflag ^ old_termios->c_cflag) == 0 && |
20620d68 DW |
1193 | tty->termios->c_ospeed == old_termios->c_ospeed && |
1194 | tty->termios->c_ispeed == old_termios->c_ispeed && | |
e5238442 | 1195 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { |
1da177e4 | 1196 | return; |
e5238442 | 1197 | } |
1da177e4 LT |
1198 | |
1199 | uart_change_speed(state, old_termios); | |
1200 | ||
1201 | /* Handle transition to B0 status */ | |
1202 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
1203 | uart_clear_mctrl(state->port, TIOCM_RTS | TIOCM_DTR); | |
1204 | ||
1205 | /* Handle transition away from B0 status */ | |
1206 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { | |
1207 | unsigned int mask = TIOCM_DTR; | |
1208 | if (!(cflag & CRTSCTS) || | |
1209 | !test_bit(TTY_THROTTLED, &tty->flags)) | |
1210 | mask |= TIOCM_RTS; | |
1211 | uart_set_mctrl(state->port, mask); | |
1212 | } | |
1213 | ||
1214 | /* Handle turning off CRTSCTS */ | |
1215 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
1216 | spin_lock_irqsave(&state->port->lock, flags); | |
1217 | tty->hw_stopped = 0; | |
1218 | __uart_start(tty); | |
1219 | spin_unlock_irqrestore(&state->port->lock, flags); | |
1220 | } | |
1221 | ||
0dd7a1ae RK |
1222 | /* Handle turning on CRTSCTS */ |
1223 | if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { | |
1224 | spin_lock_irqsave(&state->port->lock, flags); | |
1225 | if (!(state->port->ops->get_mctrl(state->port) & TIOCM_CTS)) { | |
1226 | tty->hw_stopped = 1; | |
b129a8cc | 1227 | state->port->ops->stop_tx(state->port); |
0dd7a1ae RK |
1228 | } |
1229 | spin_unlock_irqrestore(&state->port->lock, flags); | |
1230 | } | |
1da177e4 LT |
1231 | #if 0 |
1232 | /* | |
1233 | * No need to wake up processes in open wait, since they | |
1234 | * sample the CLOCAL flag once, and don't recheck it. | |
1235 | * XXX It's not clear whether the current behavior is correct | |
1236 | * or not. Hence, this may change..... | |
1237 | */ | |
1238 | if (!(old_termios->c_cflag & CLOCAL) && | |
1239 | (tty->termios->c_cflag & CLOCAL)) | |
1240 | wake_up_interruptible(&state->info->open_wait); | |
1241 | #endif | |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | * In 2.4.5, calls to this will be serialized via the BKL in | |
1246 | * linux/drivers/char/tty_io.c:tty_release() | |
1247 | * linux/drivers/char/tty_io.c:do_tty_handup() | |
1248 | */ | |
1249 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1250 | { | |
1251 | struct uart_state *state = tty->driver_data; | |
1252 | struct uart_port *port; | |
a46c9994 | 1253 | |
1da177e4 LT |
1254 | BUG_ON(!kernel_locked()); |
1255 | ||
1256 | if (!state || !state->port) | |
1257 | return; | |
1258 | ||
1259 | port = state->port; | |
1260 | ||
eb3a1e11 | 1261 | pr_debug("uart_close(%d) called\n", port->line); |
1da177e4 | 1262 | |
e2862f6a | 1263 | mutex_lock(&state->mutex); |
1da177e4 LT |
1264 | |
1265 | if (tty_hung_up_p(filp)) | |
1266 | goto done; | |
1267 | ||
1268 | if ((tty->count == 1) && (state->count != 1)) { | |
1269 | /* | |
1270 | * Uh, oh. tty->count is 1, which means that the tty | |
1271 | * structure will be freed. state->count should always | |
1272 | * be one in these conditions. If it's greater than | |
1273 | * one, we've got real problems, since it means the | |
1274 | * serial port won't be shutdown. | |
1275 | */ | |
1276 | printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, " | |
1277 | "state->count is %d\n", state->count); | |
1278 | state->count = 1; | |
1279 | } | |
1280 | if (--state->count < 0) { | |
1281 | printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n", | |
1282 | tty->name, state->count); | |
1283 | state->count = 0; | |
1284 | } | |
1285 | if (state->count) | |
1286 | goto done; | |
1287 | ||
1288 | /* | |
1289 | * Now we wait for the transmit buffer to clear; and we notify | |
1290 | * the line discipline to only process XON/XOFF characters by | |
1291 | * setting tty->closing. | |
1292 | */ | |
1293 | tty->closing = 1; | |
1294 | ||
1295 | if (state->closing_wait != USF_CLOSING_WAIT_NONE) | |
1296 | tty_wait_until_sent(tty, msecs_to_jiffies(state->closing_wait)); | |
1297 | ||
1298 | /* | |
1299 | * At this point, we stop accepting input. To do this, we | |
1300 | * disable the receive line status interrupts. | |
1301 | */ | |
1302 | if (state->info->flags & UIF_INITIALIZED) { | |
1303 | unsigned long flags; | |
1304 | spin_lock_irqsave(&port->lock, flags); | |
1305 | port->ops->stop_rx(port); | |
1306 | spin_unlock_irqrestore(&port->lock, flags); | |
1307 | /* | |
1308 | * Before we drop DTR, make sure the UART transmitter | |
1309 | * has completely drained; this is especially | |
1310 | * important if there is a transmit FIFO! | |
1311 | */ | |
1312 | uart_wait_until_sent(tty, port->timeout); | |
1313 | } | |
1314 | ||
1315 | uart_shutdown(state); | |
1316 | uart_flush_buffer(tty); | |
1317 | ||
a46c9994 AC |
1318 | tty_ldisc_flush(tty); |
1319 | ||
1da177e4 LT |
1320 | tty->closing = 0; |
1321 | state->info->tty = NULL; | |
1322 | ||
1323 | if (state->info->blocked_open) { | |
1324 | if (state->close_delay) | |
1325 | msleep_interruptible(state->close_delay); | |
1326 | } else if (!uart_console(port)) { | |
1327 | uart_change_pm(state, 3); | |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * Wake up anyone trying to open this port. | |
1332 | */ | |
1333 | state->info->flags &= ~UIF_NORMAL_ACTIVE; | |
1334 | wake_up_interruptible(&state->info->open_wait); | |
1335 | ||
1336 | done: | |
e2862f6a | 1337 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1338 | } |
1339 | ||
1340 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) | |
1341 | { | |
1342 | struct uart_state *state = tty->driver_data; | |
1343 | struct uart_port *port = state->port; | |
1344 | unsigned long char_time, expire; | |
1345 | ||
1da177e4 LT |
1346 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1347 | return; | |
1348 | ||
f34d7a5b AC |
1349 | lock_kernel(); |
1350 | ||
1da177e4 LT |
1351 | /* |
1352 | * Set the check interval to be 1/5 of the estimated time to | |
1353 | * send a single character, and make it at least 1. The check | |
1354 | * interval should also be less than the timeout. | |
1355 | * | |
1356 | * Note: we have to use pretty tight timings here to satisfy | |
1357 | * the NIST-PCTS. | |
1358 | */ | |
1359 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1360 | char_time = char_time / 5; | |
1361 | if (char_time == 0) | |
1362 | char_time = 1; | |
1363 | if (timeout && timeout < char_time) | |
1364 | char_time = timeout; | |
1365 | ||
1366 | /* | |
1367 | * If the transmitter hasn't cleared in twice the approximate | |
1368 | * amount of time to send the entire FIFO, it probably won't | |
1369 | * ever clear. This assumes the UART isn't doing flow | |
1370 | * control, which is currently the case. Hence, if it ever | |
1371 | * takes longer than port->timeout, this is probably due to a | |
1372 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1373 | * 2*port->timeout. | |
1374 | */ | |
1375 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1376 | timeout = 2 * port->timeout; | |
1377 | ||
1378 | expire = jiffies + timeout; | |
1379 | ||
eb3a1e11 | 1380 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1381 | port->line, jiffies, expire); |
1da177e4 LT |
1382 | |
1383 | /* | |
1384 | * Check whether the transmitter is empty every 'char_time'. | |
1385 | * 'timeout' / 'expire' give us the maximum amount of time | |
1386 | * we wait. | |
1387 | */ | |
1388 | while (!port->ops->tx_empty(port)) { | |
1389 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1390 | if (signal_pending(current)) | |
1391 | break; | |
1392 | if (time_after(jiffies, expire)) | |
1393 | break; | |
1394 | } | |
1395 | set_current_state(TASK_RUNNING); /* might not be needed */ | |
f34d7a5b | 1396 | unlock_kernel(); |
1da177e4 LT |
1397 | } |
1398 | ||
1399 | /* | |
1400 | * This is called with the BKL held in | |
1401 | * linux/drivers/char/tty_io.c:do_tty_hangup() | |
1402 | * We're called from the eventd thread, so we can sleep for | |
1403 | * a _short_ time only. | |
1404 | */ | |
1405 | static void uart_hangup(struct tty_struct *tty) | |
1406 | { | |
1407 | struct uart_state *state = tty->driver_data; | |
1408 | ||
1409 | BUG_ON(!kernel_locked()); | |
eb3a1e11 | 1410 | pr_debug("uart_hangup(%d)\n", state->port->line); |
1da177e4 | 1411 | |
e2862f6a | 1412 | mutex_lock(&state->mutex); |
1da177e4 LT |
1413 | if (state->info && state->info->flags & UIF_NORMAL_ACTIVE) { |
1414 | uart_flush_buffer(tty); | |
1415 | uart_shutdown(state); | |
1416 | state->count = 0; | |
1417 | state->info->flags &= ~UIF_NORMAL_ACTIVE; | |
1418 | state->info->tty = NULL; | |
1419 | wake_up_interruptible(&state->info->open_wait); | |
1420 | wake_up_interruptible(&state->info->delta_msr_wait); | |
1421 | } | |
e2862f6a | 1422 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1423 | } |
1424 | ||
1425 | /* | |
1426 | * Copy across the serial console cflag setting into the termios settings | |
1427 | * for the initial open of the port. This allows continuity between the | |
1428 | * kernel settings, and the settings init adopts when it opens the port | |
1429 | * for the first time. | |
1430 | */ | |
1431 | static void uart_update_termios(struct uart_state *state) | |
1432 | { | |
1433 | struct tty_struct *tty = state->info->tty; | |
1434 | struct uart_port *port = state->port; | |
1435 | ||
1436 | if (uart_console(port) && port->cons->cflag) { | |
1437 | tty->termios->c_cflag = port->cons->cflag; | |
1438 | port->cons->cflag = 0; | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * If the device failed to grab its irq resources, | |
1443 | * or some other error occurred, don't try to talk | |
1444 | * to the port hardware. | |
1445 | */ | |
1446 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { | |
1447 | /* | |
1448 | * Make termios settings take effect. | |
1449 | */ | |
1450 | uart_change_speed(state, NULL); | |
1451 | ||
1452 | /* | |
1453 | * And finally enable the RTS and DTR signals. | |
1454 | */ | |
1455 | if (tty->termios->c_cflag & CBAUD) | |
1456 | uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
1457 | } | |
1458 | } | |
1459 | ||
1460 | /* | |
1461 | * Block the open until the port is ready. We must be called with | |
1462 | * the per-port semaphore held. | |
1463 | */ | |
1464 | static int | |
1465 | uart_block_til_ready(struct file *filp, struct uart_state *state) | |
1466 | { | |
1467 | DECLARE_WAITQUEUE(wait, current); | |
1468 | struct uart_info *info = state->info; | |
1469 | struct uart_port *port = state->port; | |
c5f4644e | 1470 | unsigned int mctrl; |
1da177e4 LT |
1471 | |
1472 | info->blocked_open++; | |
1473 | state->count--; | |
1474 | ||
1475 | add_wait_queue(&info->open_wait, &wait); | |
1476 | while (1) { | |
1477 | set_current_state(TASK_INTERRUPTIBLE); | |
1478 | ||
1479 | /* | |
1480 | * If we have been hung up, tell userspace/restart open. | |
1481 | */ | |
1482 | if (tty_hung_up_p(filp) || info->tty == NULL) | |
1483 | break; | |
1484 | ||
1485 | /* | |
1486 | * If the port has been closed, tell userspace/restart open. | |
1487 | */ | |
1488 | if (!(info->flags & UIF_INITIALIZED)) | |
1489 | break; | |
1490 | ||
1491 | /* | |
1492 | * If non-blocking mode is set, or CLOCAL mode is set, | |
1493 | * we don't want to wait for the modem status lines to | |
1494 | * indicate that the port is ready. | |
1495 | * | |
1496 | * Also, if the port is not enabled/configured, we want | |
1497 | * to allow the open to succeed here. Note that we will | |
1498 | * have set TTY_IO_ERROR for a non-existant port. | |
1499 | */ | |
1500 | if ((filp->f_flags & O_NONBLOCK) || | |
a46c9994 AC |
1501 | (info->tty->termios->c_cflag & CLOCAL) || |
1502 | (info->tty->flags & (1 << TTY_IO_ERROR))) | |
1da177e4 | 1503 | break; |
1da177e4 LT |
1504 | |
1505 | /* | |
1506 | * Set DTR to allow modem to know we're waiting. Do | |
1507 | * not set RTS here - we want to make sure we catch | |
1508 | * the data from the modem. | |
1509 | */ | |
1510 | if (info->tty->termios->c_cflag & CBAUD) | |
1511 | uart_set_mctrl(port, TIOCM_DTR); | |
1512 | ||
1513 | /* | |
1514 | * and wait for the carrier to indicate that the | |
1515 | * modem is ready for us. | |
1516 | */ | |
c5f4644e | 1517 | spin_lock_irq(&port->lock); |
f61051cd | 1518 | port->ops->enable_ms(port); |
c5f4644e RK |
1519 | mctrl = port->ops->get_mctrl(port); |
1520 | spin_unlock_irq(&port->lock); | |
1521 | if (mctrl & TIOCM_CAR) | |
1da177e4 LT |
1522 | break; |
1523 | ||
e2862f6a | 1524 | mutex_unlock(&state->mutex); |
1da177e4 | 1525 | schedule(); |
e2862f6a | 1526 | mutex_lock(&state->mutex); |
1da177e4 LT |
1527 | |
1528 | if (signal_pending(current)) | |
1529 | break; | |
1530 | } | |
1531 | set_current_state(TASK_RUNNING); | |
1532 | remove_wait_queue(&info->open_wait, &wait); | |
1533 | ||
1534 | state->count++; | |
1535 | info->blocked_open--; | |
1536 | ||
1537 | if (signal_pending(current)) | |
1538 | return -ERESTARTSYS; | |
1539 | ||
1540 | if (!info->tty || tty_hung_up_p(filp)) | |
1541 | return -EAGAIN; | |
1542 | ||
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static struct uart_state *uart_get(struct uart_driver *drv, int line) | |
1547 | { | |
1548 | struct uart_state *state; | |
68ac64cd | 1549 | int ret = 0; |
1da177e4 | 1550 | |
1da177e4 | 1551 | state = drv->state + line; |
e2862f6a | 1552 | if (mutex_lock_interruptible(&state->mutex)) { |
68ac64cd RK |
1553 | ret = -ERESTARTSYS; |
1554 | goto err; | |
1da177e4 LT |
1555 | } |
1556 | ||
1557 | state->count++; | |
68ac64cd RK |
1558 | if (!state->port || state->port->flags & UPF_DEAD) { |
1559 | ret = -ENXIO; | |
1560 | goto err_unlock; | |
1da177e4 LT |
1561 | } |
1562 | ||
1563 | if (!state->info) { | |
8f31bb39 | 1564 | state->info = kzalloc(sizeof(struct uart_info), GFP_KERNEL); |
1da177e4 | 1565 | if (state->info) { |
1da177e4 LT |
1566 | init_waitqueue_head(&state->info->open_wait); |
1567 | init_waitqueue_head(&state->info->delta_msr_wait); | |
1568 | ||
1569 | /* | |
1570 | * Link the info into the other structures. | |
1571 | */ | |
1572 | state->port->info = state->info; | |
1573 | ||
1574 | tasklet_init(&state->info->tlet, uart_tasklet_action, | |
1575 | (unsigned long)state); | |
1576 | } else { | |
68ac64cd RK |
1577 | ret = -ENOMEM; |
1578 | goto err_unlock; | |
1da177e4 LT |
1579 | } |
1580 | } | |
1da177e4 | 1581 | return state; |
68ac64cd RK |
1582 | |
1583 | err_unlock: | |
1584 | state->count--; | |
1585 | mutex_unlock(&state->mutex); | |
1586 | err: | |
1587 | return ERR_PTR(ret); | |
1da177e4 LT |
1588 | } |
1589 | ||
1590 | /* | |
922f9cfa DC |
1591 | * calls to uart_open are serialised by the BKL in |
1592 | * fs/char_dev.c:chrdev_open() | |
1da177e4 LT |
1593 | * Note that if this fails, then uart_close() _will_ be called. |
1594 | * | |
1595 | * In time, we want to scrap the "opening nonpresent ports" | |
1596 | * behaviour and implement an alternative way for setserial | |
1597 | * to set base addresses/ports/types. This will allow us to | |
1598 | * get rid of a certain amount of extra tests. | |
1599 | */ | |
1600 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1601 | { | |
1602 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1603 | struct uart_state *state; | |
1604 | int retval, line = tty->index; | |
1605 | ||
1606 | BUG_ON(!kernel_locked()); | |
eb3a1e11 | 1607 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 LT |
1608 | |
1609 | /* | |
1610 | * tty->driver->num won't change, so we won't fail here with | |
1611 | * tty->driver_data set to something non-NULL (and therefore | |
1612 | * we won't get caught by uart_close()). | |
1613 | */ | |
1614 | retval = -ENODEV; | |
1615 | if (line >= tty->driver->num) | |
1616 | goto fail; | |
1617 | ||
1618 | /* | |
1619 | * We take the semaphore inside uart_get to guarantee that we won't | |
1620 | * be re-entered while allocating the info structure, or while we | |
1621 | * request any IRQs that the driver may need. This also has the nice | |
1622 | * side-effect that it delays the action of uart_hangup, so we can | |
1623 | * guarantee that info->tty will always contain something reasonable. | |
1624 | */ | |
1625 | state = uart_get(drv, line); | |
1626 | if (IS_ERR(state)) { | |
1627 | retval = PTR_ERR(state); | |
1628 | goto fail; | |
1629 | } | |
1630 | ||
1631 | /* | |
1632 | * Once we set tty->driver_data here, we are guaranteed that | |
1633 | * uart_close() will decrement the driver module use count. | |
1634 | * Any failures from here onwards should not touch the count. | |
1635 | */ | |
1636 | tty->driver_data = state; | |
1637 | tty->low_latency = (state->port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
1638 | tty->alt_speed = 0; | |
1639 | state->info->tty = tty; | |
1640 | ||
1641 | /* | |
1642 | * If the port is in the middle of closing, bail out now. | |
1643 | */ | |
1644 | if (tty_hung_up_p(filp)) { | |
1645 | retval = -EAGAIN; | |
1646 | state->count--; | |
e2862f6a | 1647 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1648 | goto fail; |
1649 | } | |
1650 | ||
1651 | /* | |
1652 | * Make sure the device is in D0 state. | |
1653 | */ | |
1654 | if (state->count == 1) | |
1655 | uart_change_pm(state, 0); | |
1656 | ||
1657 | /* | |
1658 | * Start up the serial port. | |
1659 | */ | |
1660 | retval = uart_startup(state, 0); | |
1661 | ||
1662 | /* | |
1663 | * If we succeeded, wait until the port is ready. | |
1664 | */ | |
1665 | if (retval == 0) | |
1666 | retval = uart_block_til_ready(filp, state); | |
e2862f6a | 1667 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1668 | |
1669 | /* | |
1670 | * If this is the first open to succeed, adjust things to suit. | |
1671 | */ | |
1672 | if (retval == 0 && !(state->info->flags & UIF_NORMAL_ACTIVE)) { | |
1673 | state->info->flags |= UIF_NORMAL_ACTIVE; | |
1674 | ||
1675 | uart_update_termios(state); | |
1676 | } | |
1677 | ||
1678 | fail: | |
1679 | return retval; | |
1680 | } | |
1681 | ||
1682 | static const char *uart_type(struct uart_port *port) | |
1683 | { | |
1684 | const char *str = NULL; | |
1685 | ||
1686 | if (port->ops->type) | |
1687 | str = port->ops->type(port); | |
1688 | ||
1689 | if (!str) | |
1690 | str = "unknown"; | |
1691 | ||
1692 | return str; | |
1693 | } | |
1694 | ||
1695 | #ifdef CONFIG_PROC_FS | |
1696 | ||
1697 | static int uart_line_info(char *buf, struct uart_driver *drv, int i) | |
1698 | { | |
1699 | struct uart_state *state = drv->state + i; | |
3689a0ec | 1700 | int pm_state; |
1da177e4 LT |
1701 | struct uart_port *port = state->port; |
1702 | char stat_buf[32]; | |
1703 | unsigned int status; | |
6c6a2334 | 1704 | int mmio, ret; |
1da177e4 LT |
1705 | |
1706 | if (!port) | |
1707 | return 0; | |
1708 | ||
6c6a2334 | 1709 | mmio = port->iotype >= UPIO_MEM; |
4f640efb | 1710 | ret = sprintf(buf, "%d: uart:%s %s%08llX irq:%d", |
1da177e4 | 1711 | port->line, uart_type(port), |
6c6a2334 | 1712 | mmio ? "mmio:0x" : "port:", |
4f640efb | 1713 | mmio ? (unsigned long long)port->mapbase |
a46c9994 | 1714 | : (unsigned long long) port->iobase, |
1da177e4 LT |
1715 | port->irq); |
1716 | ||
1717 | if (port->type == PORT_UNKNOWN) { | |
1718 | strcat(buf, "\n"); | |
1719 | return ret + 1; | |
1720 | } | |
1721 | ||
a46c9994 | 1722 | if (capable(CAP_SYS_ADMIN)) { |
3689a0ec GD |
1723 | mutex_lock(&state->mutex); |
1724 | pm_state = state->pm_state; | |
1725 | if (pm_state) | |
1726 | uart_change_pm(state, 0); | |
c5f4644e | 1727 | spin_lock_irq(&port->lock); |
1da177e4 | 1728 | status = port->ops->get_mctrl(port); |
c5f4644e | 1729 | spin_unlock_irq(&port->lock); |
3689a0ec GD |
1730 | if (pm_state) |
1731 | uart_change_pm(state, pm_state); | |
1732 | mutex_unlock(&state->mutex); | |
1da177e4 LT |
1733 | |
1734 | ret += sprintf(buf + ret, " tx:%d rx:%d", | |
1735 | port->icount.tx, port->icount.rx); | |
1736 | if (port->icount.frame) | |
1737 | ret += sprintf(buf + ret, " fe:%d", | |
1738 | port->icount.frame); | |
1739 | if (port->icount.parity) | |
1740 | ret += sprintf(buf + ret, " pe:%d", | |
1741 | port->icount.parity); | |
1742 | if (port->icount.brk) | |
1743 | ret += sprintf(buf + ret, " brk:%d", | |
1744 | port->icount.brk); | |
1745 | if (port->icount.overrun) | |
1746 | ret += sprintf(buf + ret, " oe:%d", | |
1747 | port->icount.overrun); | |
a46c9994 AC |
1748 | |
1749 | #define INFOBIT(bit, str) \ | |
1da177e4 LT |
1750 | if (port->mctrl & (bit)) \ |
1751 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1752 | strlen(stat_buf) - 2) | |
a46c9994 | 1753 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1754 | if (status & (bit)) \ |
1755 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1756 | strlen(stat_buf) - 2) | |
1757 | ||
1758 | stat_buf[0] = '\0'; | |
1759 | stat_buf[1] = '\0'; | |
1760 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1761 | STATBIT(TIOCM_CTS, "|CTS"); | |
1762 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1763 | STATBIT(TIOCM_DSR, "|DSR"); | |
1764 | STATBIT(TIOCM_CAR, "|CD"); | |
1765 | STATBIT(TIOCM_RNG, "|RI"); | |
1766 | if (stat_buf[0]) | |
1767 | stat_buf[0] = ' '; | |
1768 | strcat(stat_buf, "\n"); | |
a46c9994 | 1769 | |
1da177e4 LT |
1770 | ret += sprintf(buf + ret, stat_buf); |
1771 | } else { | |
1772 | strcat(buf, "\n"); | |
1773 | ret++; | |
1774 | } | |
1775 | #undef STATBIT | |
1776 | #undef INFOBIT | |
1777 | return ret; | |
1778 | } | |
1779 | ||
1780 | static int uart_read_proc(char *page, char **start, off_t off, | |
1781 | int count, int *eof, void *data) | |
1782 | { | |
1783 | struct tty_driver *ttydrv = data; | |
1784 | struct uart_driver *drv = ttydrv->driver_state; | |
1785 | int i, len = 0, l; | |
1786 | off_t begin = 0; | |
1787 | ||
1788 | len += sprintf(page, "serinfo:1.0 driver%s%s revision:%s\n", | |
1789 | "", "", ""); | |
1790 | for (i = 0; i < drv->nr && len < PAGE_SIZE - 96; i++) { | |
1791 | l = uart_line_info(page + len, drv, i); | |
1792 | len += l; | |
1793 | if (len + begin > off + count) | |
1794 | goto done; | |
1795 | if (len + begin < off) { | |
1796 | begin += len; | |
1797 | len = 0; | |
1798 | } | |
1799 | } | |
1800 | *eof = 1; | |
1801 | done: | |
1802 | if (off >= len + begin) | |
1803 | return 0; | |
1804 | *start = page + (off - begin); | |
1805 | return (count < begin + len - off) ? count : (begin + len - off); | |
1806 | } | |
1807 | #endif | |
1808 | ||
4a1b5502 | 1809 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1810 | /* |
1811 | * uart_console_write - write a console message to a serial port | |
1812 | * @port: the port to write the message | |
1813 | * @s: array of characters | |
1814 | * @count: number of characters in string to write | |
1815 | * @write: function to write character to port | |
1816 | */ | |
1817 | void uart_console_write(struct uart_port *port, const char *s, | |
1818 | unsigned int count, | |
1819 | void (*putchar)(struct uart_port *, int)) | |
1820 | { | |
1821 | unsigned int i; | |
1822 | ||
1823 | for (i = 0; i < count; i++, s++) { | |
1824 | if (*s == '\n') | |
1825 | putchar(port, '\r'); | |
1826 | putchar(port, *s); | |
1827 | } | |
1828 | } | |
1829 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1830 | ||
1da177e4 LT |
1831 | /* |
1832 | * Check whether an invalid uart number has been specified, and | |
1833 | * if so, search for the first available port that does have | |
1834 | * console support. | |
1835 | */ | |
1836 | struct uart_port * __init | |
1837 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1838 | { | |
1839 | int idx = co->index; | |
1840 | ||
1841 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1842 | ports[idx].membase == NULL)) | |
1843 | for (idx = 0; idx < nr; idx++) | |
1844 | if (ports[idx].iobase != 0 || | |
1845 | ports[idx].membase != NULL) | |
1846 | break; | |
1847 | ||
1848 | co->index = idx; | |
1849 | ||
1850 | return ports + idx; | |
1851 | } | |
1852 | ||
1853 | /** | |
1854 | * uart_parse_options - Parse serial port baud/parity/bits/flow contro. | |
1855 | * @options: pointer to option string | |
1856 | * @baud: pointer to an 'int' variable for the baud rate. | |
1857 | * @parity: pointer to an 'int' variable for the parity. | |
1858 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1859 | * @flow: pointer to an 'int' variable for the flow control character. | |
1860 | * | |
1861 | * uart_parse_options decodes a string containing the serial console | |
1862 | * options. The format of the string is <baud><parity><bits><flow>, | |
1863 | * eg: 115200n8r | |
1864 | */ | |
f2d937f3 | 1865 | void |
1da177e4 LT |
1866 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1867 | { | |
1868 | char *s = options; | |
1869 | ||
1870 | *baud = simple_strtoul(s, NULL, 10); | |
1871 | while (*s >= '0' && *s <= '9') | |
1872 | s++; | |
1873 | if (*s) | |
1874 | *parity = *s++; | |
1875 | if (*s) | |
1876 | *bits = *s++ - '0'; | |
1877 | if (*s) | |
1878 | *flow = *s; | |
1879 | } | |
f2d937f3 | 1880 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1881 | |
1882 | struct baud_rates { | |
1883 | unsigned int rate; | |
1884 | unsigned int cflag; | |
1885 | }; | |
1886 | ||
cb3592be | 1887 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1888 | { 921600, B921600 }, |
1889 | { 460800, B460800 }, | |
1890 | { 230400, B230400 }, | |
1891 | { 115200, B115200 }, | |
1892 | { 57600, B57600 }, | |
1893 | { 38400, B38400 }, | |
1894 | { 19200, B19200 }, | |
1895 | { 9600, B9600 }, | |
1896 | { 4800, B4800 }, | |
1897 | { 2400, B2400 }, | |
1898 | { 1200, B1200 }, | |
1899 | { 0, B38400 } | |
1900 | }; | |
1901 | ||
1902 | /** | |
1903 | * uart_set_options - setup the serial console parameters | |
1904 | * @port: pointer to the serial ports uart_port structure | |
1905 | * @co: console pointer | |
1906 | * @baud: baud rate | |
1907 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1908 | * @bits: number of data bits | |
1909 | * @flow: flow control character - 'r' (rts) | |
1910 | */ | |
f2d937f3 | 1911 | int |
1da177e4 LT |
1912 | uart_set_options(struct uart_port *port, struct console *co, |
1913 | int baud, int parity, int bits, int flow) | |
1914 | { | |
606d099c | 1915 | struct ktermios termios; |
149b36ea | 1916 | static struct ktermios dummy; |
1da177e4 LT |
1917 | int i; |
1918 | ||
976ecd12 RK |
1919 | /* |
1920 | * Ensure that the serial console lock is initialised | |
1921 | * early. | |
1922 | */ | |
1923 | spin_lock_init(&port->lock); | |
13e83599 | 1924 | lockdep_set_class(&port->lock, &port_lock_key); |
976ecd12 | 1925 | |
606d099c | 1926 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1927 | |
1928 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1929 | ||
1930 | /* | |
1931 | * Construct a cflag setting. | |
1932 | */ | |
1933 | for (i = 0; baud_rates[i].rate; i++) | |
1934 | if (baud_rates[i].rate <= baud) | |
1935 | break; | |
1936 | ||
1937 | termios.c_cflag |= baud_rates[i].cflag; | |
1938 | ||
1939 | if (bits == 7) | |
1940 | termios.c_cflag |= CS7; | |
1941 | else | |
1942 | termios.c_cflag |= CS8; | |
1943 | ||
1944 | switch (parity) { | |
1945 | case 'o': case 'O': | |
1946 | termios.c_cflag |= PARODD; | |
1947 | /*fall through*/ | |
1948 | case 'e': case 'E': | |
1949 | termios.c_cflag |= PARENB; | |
1950 | break; | |
1951 | } | |
1952 | ||
1953 | if (flow == 'r') | |
1954 | termios.c_cflag |= CRTSCTS; | |
1955 | ||
79492689 YL |
1956 | /* |
1957 | * some uarts on other side don't support no flow control. | |
1958 | * So we set * DTR in host uart to make them happy | |
1959 | */ | |
1960 | port->mctrl |= TIOCM_DTR; | |
1961 | ||
149b36ea | 1962 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1963 | /* |
1964 | * Allow the setting of the UART parameters with a NULL console | |
1965 | * too: | |
1966 | */ | |
1967 | if (co) | |
1968 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1969 | |
1970 | return 0; | |
1971 | } | |
f2d937f3 | 1972 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1973 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1974 | ||
1975 | static void uart_change_pm(struct uart_state *state, int pm_state) | |
1976 | { | |
1977 | struct uart_port *port = state->port; | |
1281e360 AV |
1978 | |
1979 | if (state->pm_state != pm_state) { | |
1980 | if (port->ops->pm) | |
1981 | port->ops->pm(port, pm_state, state->pm_state); | |
1982 | state->pm_state = pm_state; | |
1983 | } | |
1da177e4 LT |
1984 | } |
1985 | ||
b3b708fa GL |
1986 | struct uart_match { |
1987 | struct uart_port *port; | |
1988 | struct uart_driver *driver; | |
1989 | }; | |
1990 | ||
1991 | static int serial_match_port(struct device *dev, void *data) | |
1992 | { | |
1993 | struct uart_match *match = data; | |
1994 | dev_t devt = MKDEV(match->driver->major, match->driver->minor) + match->port->line; | |
1995 | ||
1996 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1997 | } | |
1998 | ||
1da177e4 LT |
1999 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *port) |
2000 | { | |
2001 | struct uart_state *state = drv->state + port->line; | |
b3b708fa GL |
2002 | struct device *tty_dev; |
2003 | struct uart_match match = {port, drv}; | |
1da177e4 | 2004 | |
e2862f6a | 2005 | mutex_lock(&state->mutex); |
1da177e4 | 2006 | |
8f4ce8c3 AS |
2007 | if (!console_suspend_enabled && uart_console(port)) { |
2008 | /* we're going to avoid suspending serial console */ | |
e1da95ae RW |
2009 | mutex_unlock(&state->mutex); |
2010 | return 0; | |
2011 | } | |
e1da95ae | 2012 | |
b3b708fa GL |
2013 | tty_dev = device_find_child(port->dev, &match, serial_match_port); |
2014 | if (device_may_wakeup(tty_dev)) { | |
2015 | enable_irq_wake(port->irq); | |
2016 | put_device(tty_dev); | |
2017 | mutex_unlock(&state->mutex); | |
2018 | return 0; | |
2019 | } | |
2020 | port->suspended = 1; | |
2021 | ||
1da177e4 | 2022 | if (state->info && state->info->flags & UIF_INITIALIZED) { |
ba899dbc | 2023 | const struct uart_ops *ops = port->ops; |
c8c6bfa3 | 2024 | int tries; |
1da177e4 | 2025 | |
a6b93a90 RK |
2026 | state->info->flags = (state->info->flags & ~UIF_INITIALIZED) |
2027 | | UIF_SUSPENDED; | |
2028 | ||
1da177e4 | 2029 | spin_lock_irq(&port->lock); |
b129a8cc | 2030 | ops->stop_tx(port); |
1da177e4 LT |
2031 | ops->set_mctrl(port, 0); |
2032 | ops->stop_rx(port); | |
2033 | spin_unlock_irq(&port->lock); | |
2034 | ||
2035 | /* | |
2036 | * Wait for the transmitter to empty. | |
2037 | */ | |
a46c9994 | 2038 | for (tries = 3; !ops->tx_empty(port) && tries; tries--) |
1da177e4 | 2039 | msleep(10); |
c8c6bfa3 | 2040 | if (!tries) |
a46c9994 AC |
2041 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
2042 | "transmitter\n", | |
c8c6bfa3 RK |
2043 | port->dev ? port->dev->bus_id : "", |
2044 | port->dev ? ": " : "", | |
2045 | drv->dev_name, port->line); | |
1da177e4 LT |
2046 | |
2047 | ops->shutdown(port); | |
2048 | } | |
2049 | ||
2050 | /* | |
2051 | * Disable the console device before suspending. | |
2052 | */ | |
2053 | if (uart_console(port)) | |
2054 | console_stop(port->cons); | |
2055 | ||
2056 | uart_change_pm(state, 3); | |
2057 | ||
e2862f6a | 2058 | mutex_unlock(&state->mutex); |
1da177e4 LT |
2059 | |
2060 | return 0; | |
2061 | } | |
2062 | ||
2063 | int uart_resume_port(struct uart_driver *drv, struct uart_port *port) | |
2064 | { | |
2065 | struct uart_state *state = drv->state + port->line; | |
03a74dcc AV |
2066 | struct device *tty_dev; |
2067 | struct uart_match match = {port, drv}; | |
1da177e4 | 2068 | |
e2862f6a | 2069 | mutex_lock(&state->mutex); |
1da177e4 | 2070 | |
8f4ce8c3 AS |
2071 | if (!console_suspend_enabled && uart_console(port)) { |
2072 | /* no need to resume serial console, it wasn't suspended */ | |
e1da95ae RW |
2073 | mutex_unlock(&state->mutex); |
2074 | return 0; | |
2075 | } | |
e1da95ae | 2076 | |
03a74dcc AV |
2077 | tty_dev = device_find_child(port->dev, &match, serial_match_port); |
2078 | if (!port->suspended && device_may_wakeup(tty_dev)) { | |
b3b708fa GL |
2079 | disable_irq_wake(port->irq); |
2080 | mutex_unlock(&state->mutex); | |
2081 | return 0; | |
2082 | } | |
2083 | port->suspended = 0; | |
2084 | ||
1da177e4 LT |
2085 | /* |
2086 | * Re-enable the console device after suspending. | |
2087 | */ | |
2088 | if (uart_console(port)) { | |
606d099c | 2089 | struct ktermios termios; |
1da177e4 LT |
2090 | |
2091 | /* | |
2092 | * First try to use the console cflag setting. | |
2093 | */ | |
606d099c | 2094 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
2095 | termios.c_cflag = port->cons->cflag; |
2096 | ||
2097 | /* | |
2098 | * If that's unset, use the tty termios setting. | |
2099 | */ | |
2100 | if (state->info && state->info->tty && termios.c_cflag == 0) | |
2101 | termios = *state->info->tty->termios; | |
2102 | ||
9d778a69 | 2103 | uart_change_pm(state, 0); |
1da177e4 LT |
2104 | port->ops->set_termios(port, &termios, NULL); |
2105 | console_start(port->cons); | |
2106 | } | |
2107 | ||
a6b93a90 | 2108 | if (state->info && state->info->flags & UIF_SUSPENDED) { |
ba899dbc | 2109 | const struct uart_ops *ops = port->ops; |
ee31b337 | 2110 | int ret; |
1da177e4 | 2111 | |
9d778a69 | 2112 | uart_change_pm(state, 0); |
f34d7a5b | 2113 | spin_lock_irq(&port->lock); |
1da177e4 | 2114 | ops->set_mctrl(port, 0); |
f34d7a5b | 2115 | spin_unlock_irq(&port->lock); |
ee31b337 RK |
2116 | ret = ops->startup(port); |
2117 | if (ret == 0) { | |
2118 | uart_change_speed(state, NULL); | |
2119 | spin_lock_irq(&port->lock); | |
2120 | ops->set_mctrl(port, port->mctrl); | |
2121 | ops->start_tx(port); | |
2122 | spin_unlock_irq(&port->lock); | |
a6b93a90 | 2123 | state->info->flags |= UIF_INITIALIZED; |
ee31b337 RK |
2124 | } else { |
2125 | /* | |
2126 | * Failed to resume - maybe hardware went away? | |
2127 | * Clear the "initialized" flag so we won't try | |
2128 | * to call the low level drivers shutdown method. | |
2129 | */ | |
ee31b337 RK |
2130 | uart_shutdown(state); |
2131 | } | |
a6b93a90 RK |
2132 | |
2133 | state->info->flags &= ~UIF_SUSPENDED; | |
1da177e4 LT |
2134 | } |
2135 | ||
e2862f6a | 2136 | mutex_unlock(&state->mutex); |
1da177e4 LT |
2137 | |
2138 | return 0; | |
2139 | } | |
2140 | ||
2141 | static inline void | |
2142 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2143 | { | |
30b7a3bc RK |
2144 | char address[64]; |
2145 | ||
1da177e4 LT |
2146 | switch (port->iotype) { |
2147 | case UPIO_PORT: | |
30b7a3bc RK |
2148 | snprintf(address, sizeof(address), |
2149 | "I/O 0x%x", port->iobase); | |
1da177e4 LT |
2150 | break; |
2151 | case UPIO_HUB6: | |
30b7a3bc RK |
2152 | snprintf(address, sizeof(address), |
2153 | "I/O 0x%x offset 0x%x", port->iobase, port->hub6); | |
1da177e4 LT |
2154 | break; |
2155 | case UPIO_MEM: | |
2156 | case UPIO_MEM32: | |
21c614a7 | 2157 | case UPIO_AU: |
3be91ec7 | 2158 | case UPIO_TSI: |
beab697a | 2159 | case UPIO_DWAPB: |
30b7a3bc | 2160 | snprintf(address, sizeof(address), |
4f640efb | 2161 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2162 | break; |
2163 | default: | |
2164 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2165 | break; |
2166 | } | |
30b7a3bc | 2167 | |
0cf669d5 RK |
2168 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", |
2169 | port->dev ? port->dev->bus_id : "", | |
2170 | port->dev ? ": " : "", | |
30b7a3bc | 2171 | drv->dev_name, port->line, address, port->irq, uart_type(port)); |
1da177e4 LT |
2172 | } |
2173 | ||
2174 | static void | |
2175 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2176 | struct uart_port *port) | |
2177 | { | |
2178 | unsigned int flags; | |
2179 | ||
2180 | /* | |
2181 | * If there isn't a port here, don't do anything further. | |
2182 | */ | |
2183 | if (!port->iobase && !port->mapbase && !port->membase) | |
2184 | return; | |
2185 | ||
2186 | /* | |
2187 | * Now do the auto configuration stuff. Note that config_port | |
2188 | * is expected to claim the resources and map the port for us. | |
2189 | */ | |
2190 | flags = UART_CONFIG_TYPE; | |
2191 | if (port->flags & UPF_AUTO_IRQ) | |
2192 | flags |= UART_CONFIG_IRQ; | |
2193 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
2194 | port->type = PORT_UNKNOWN; | |
2195 | port->ops->config_port(port, flags); | |
2196 | } | |
2197 | ||
2198 | if (port->type != PORT_UNKNOWN) { | |
2199 | unsigned long flags; | |
2200 | ||
2201 | uart_report_port(drv, port); | |
2202 | ||
3689a0ec GD |
2203 | /* Power up port for set_mctrl() */ |
2204 | uart_change_pm(state, 0); | |
2205 | ||
1da177e4 LT |
2206 | /* |
2207 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2208 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2209 | * We probably don't need a spinlock around this, but |
2210 | */ | |
2211 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2212 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2213 | spin_unlock_irqrestore(&port->lock, flags); |
2214 | ||
97d97224 RK |
2215 | /* |
2216 | * If this driver supports console, and it hasn't been | |
2217 | * successfully registered yet, try to re-register it. | |
2218 | * It may be that the port was not available. | |
2219 | */ | |
2220 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2221 | register_console(port->cons); | |
2222 | ||
1da177e4 LT |
2223 | /* |
2224 | * Power down all ports by default, except the | |
2225 | * console if we have one. | |
2226 | */ | |
2227 | if (!uart_console(port)) | |
2228 | uart_change_pm(state, 3); | |
2229 | } | |
2230 | } | |
2231 | ||
f2d937f3 JW |
2232 | #ifdef CONFIG_CONSOLE_POLL |
2233 | ||
2234 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2235 | { | |
2236 | struct uart_driver *drv = driver->driver_state; | |
2237 | struct uart_state *state = drv->state + line; | |
2238 | struct uart_port *port; | |
2239 | int baud = 9600; | |
2240 | int bits = 8; | |
2241 | int parity = 'n'; | |
2242 | int flow = 'n'; | |
2243 | ||
2244 | if (!state || !state->port) | |
2245 | return -1; | |
2246 | ||
2247 | port = state->port; | |
2248 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) | |
2249 | return -1; | |
2250 | ||
2251 | if (options) { | |
2252 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2253 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2254 | } | |
2255 | ||
2256 | return 0; | |
2257 | } | |
2258 | ||
2259 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2260 | { | |
2261 | struct uart_driver *drv = driver->driver_state; | |
2262 | struct uart_state *state = drv->state + line; | |
2263 | struct uart_port *port; | |
2264 | ||
2265 | if (!state || !state->port) | |
2266 | return -1; | |
2267 | ||
2268 | port = state->port; | |
2269 | return port->ops->poll_get_char(port); | |
2270 | } | |
2271 | ||
2272 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2273 | { | |
2274 | struct uart_driver *drv = driver->driver_state; | |
2275 | struct uart_state *state = drv->state + line; | |
2276 | struct uart_port *port; | |
2277 | ||
2278 | if (!state || !state->port) | |
2279 | return; | |
2280 | ||
2281 | port = state->port; | |
2282 | port->ops->poll_put_char(port, ch); | |
2283 | } | |
2284 | #endif | |
2285 | ||
b68e31d0 | 2286 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2287 | .open = uart_open, |
2288 | .close = uart_close, | |
2289 | .write = uart_write, | |
2290 | .put_char = uart_put_char, | |
2291 | .flush_chars = uart_flush_chars, | |
2292 | .write_room = uart_write_room, | |
2293 | .chars_in_buffer= uart_chars_in_buffer, | |
2294 | .flush_buffer = uart_flush_buffer, | |
2295 | .ioctl = uart_ioctl, | |
2296 | .throttle = uart_throttle, | |
2297 | .unthrottle = uart_unthrottle, | |
2298 | .send_xchar = uart_send_xchar, | |
2299 | .set_termios = uart_set_termios, | |
64e9159f | 2300 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2301 | .stop = uart_stop, |
2302 | .start = uart_start, | |
2303 | .hangup = uart_hangup, | |
2304 | .break_ctl = uart_break_ctl, | |
2305 | .wait_until_sent= uart_wait_until_sent, | |
2306 | #ifdef CONFIG_PROC_FS | |
2307 | .read_proc = uart_read_proc, | |
2308 | #endif | |
2309 | .tiocmget = uart_tiocmget, | |
2310 | .tiocmset = uart_tiocmset, | |
f2d937f3 JW |
2311 | #ifdef CONFIG_CONSOLE_POLL |
2312 | .poll_init = uart_poll_init, | |
2313 | .poll_get_char = uart_poll_get_char, | |
2314 | .poll_put_char = uart_poll_put_char, | |
2315 | #endif | |
1da177e4 LT |
2316 | }; |
2317 | ||
2318 | /** | |
2319 | * uart_register_driver - register a driver with the uart core layer | |
2320 | * @drv: low level driver structure | |
2321 | * | |
2322 | * Register a uart driver with the core driver. We in turn register | |
2323 | * with the tty layer, and initialise the core driver per-port state. | |
2324 | * | |
2325 | * We have a proc file in /proc/tty/driver which is named after the | |
2326 | * normal driver. | |
2327 | * | |
2328 | * drv->port should be NULL, and the per-port structures should be | |
2329 | * registered using uart_add_one_port after this call has succeeded. | |
2330 | */ | |
2331 | int uart_register_driver(struct uart_driver *drv) | |
2332 | { | |
2333 | struct tty_driver *normal = NULL; | |
2334 | int i, retval; | |
2335 | ||
2336 | BUG_ON(drv->state); | |
2337 | ||
2338 | /* | |
2339 | * Maybe we should be using a slab cache for this, especially if | |
2340 | * we have a large number of ports to handle. | |
2341 | */ | |
8f31bb39 | 2342 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2343 | retval = -ENOMEM; |
2344 | if (!drv->state) | |
2345 | goto out; | |
2346 | ||
1da177e4 LT |
2347 | normal = alloc_tty_driver(drv->nr); |
2348 | if (!normal) | |
2349 | goto out; | |
2350 | ||
2351 | drv->tty_driver = normal; | |
2352 | ||
2353 | normal->owner = drv->owner; | |
2354 | normal->driver_name = drv->driver_name; | |
1da177e4 LT |
2355 | normal->name = drv->dev_name; |
2356 | normal->major = drv->major; | |
2357 | normal->minor_start = drv->minor; | |
2358 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2359 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2360 | normal->init_termios = tty_std_termios; | |
2361 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2362 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2363 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2364 | normal->driver_state = drv; |
2365 | tty_set_operations(normal, &uart_ops); | |
2366 | ||
2367 | /* | |
2368 | * Initialise the UART state(s). | |
2369 | */ | |
2370 | for (i = 0; i < drv->nr; i++) { | |
2371 | struct uart_state *state = drv->state + i; | |
2372 | ||
2373 | state->close_delay = 500; /* .5 seconds */ | |
2374 | state->closing_wait = 30000; /* 30 seconds */ | |
2375 | ||
e2862f6a | 2376 | mutex_init(&state->mutex); |
1da177e4 LT |
2377 | } |
2378 | ||
2379 | retval = tty_register_driver(normal); | |
2380 | out: | |
2381 | if (retval < 0) { | |
2382 | put_tty_driver(normal); | |
2383 | kfree(drv->state); | |
2384 | } | |
2385 | return retval; | |
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 | * @port: 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 *port) | |
2424 | { | |
2425 | struct uart_state *state; | |
2426 | int ret = 0; | |
b3b708fa | 2427 | struct device *tty_dev; |
1da177e4 LT |
2428 | |
2429 | BUG_ON(in_interrupt()); | |
2430 | ||
2431 | if (port->line >= drv->nr) | |
2432 | return -EINVAL; | |
2433 | ||
2434 | state = drv->state + port->line; | |
2435 | ||
f392ecfa | 2436 | mutex_lock(&port_mutex); |
68ac64cd | 2437 | mutex_lock(&state->mutex); |
1da177e4 LT |
2438 | if (state->port) { |
2439 | ret = -EINVAL; | |
2440 | goto out; | |
2441 | } | |
2442 | ||
2443 | state->port = port; | |
97d97224 | 2444 | state->pm_state = -1; |
1da177e4 | 2445 | |
1da177e4 LT |
2446 | port->cons = drv->cons; |
2447 | port->info = state->info; | |
2448 | ||
976ecd12 RK |
2449 | /* |
2450 | * If this port is a console, then the spinlock is already | |
2451 | * initialised. | |
2452 | */ | |
13e83599 | 2453 | if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { |
976ecd12 | 2454 | spin_lock_init(&port->lock); |
13e83599 IM |
2455 | lockdep_set_class(&port->lock, &port_lock_key); |
2456 | } | |
976ecd12 | 2457 | |
1da177e4 LT |
2458 | uart_configure_port(drv, state, port); |
2459 | ||
2460 | /* | |
2461 | * Register the port whether it's detected or not. This allows | |
2462 | * setserial to be used to alter this ports parameters. | |
2463 | */ | |
b3b708fa GL |
2464 | tty_dev = tty_register_device(drv->tty_driver, port->line, port->dev); |
2465 | if (likely(!IS_ERR(tty_dev))) { | |
74081f86 | 2466 | device_init_wakeup(tty_dev, 1); |
b3b708fa GL |
2467 | device_set_wakeup_enable(tty_dev, 0); |
2468 | } else | |
2469 | printk(KERN_ERR "Cannot register tty device on line %d\n", | |
2470 | port->line); | |
1da177e4 | 2471 | |
68ac64cd RK |
2472 | /* |
2473 | * Ensure UPF_DEAD is not set. | |
2474 | */ | |
2475 | port->flags &= ~UPF_DEAD; | |
2476 | ||
1da177e4 | 2477 | out: |
68ac64cd | 2478 | mutex_unlock(&state->mutex); |
f392ecfa | 2479 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2480 | |
2481 | return ret; | |
2482 | } | |
2483 | ||
2484 | /** | |
2485 | * uart_remove_one_port - detach a driver defined port structure | |
2486 | * @drv: pointer to the uart low level driver structure for this port | |
2487 | * @port: uart port structure for this port | |
2488 | * | |
2489 | * This unhooks (and hangs up) the specified port structure from the | |
2490 | * core driver. No further calls will be made to the low-level code | |
2491 | * for this port. | |
2492 | */ | |
2493 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *port) | |
2494 | { | |
2495 | struct uart_state *state = drv->state + port->line; | |
68ac64cd | 2496 | struct uart_info *info; |
1da177e4 LT |
2497 | |
2498 | BUG_ON(in_interrupt()); | |
2499 | ||
2500 | if (state->port != port) | |
2501 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", | |
2502 | state->port, port); | |
2503 | ||
f392ecfa | 2504 | mutex_lock(&port_mutex); |
1da177e4 | 2505 | |
68ac64cd RK |
2506 | /* |
2507 | * Mark the port "dead" - this prevents any opens from | |
2508 | * succeeding while we shut down the port. | |
2509 | */ | |
2510 | mutex_lock(&state->mutex); | |
2511 | port->flags |= UPF_DEAD; | |
2512 | mutex_unlock(&state->mutex); | |
2513 | ||
1da177e4 | 2514 | /* |
aa4148cf | 2515 | * Remove the devices from the tty layer |
1da177e4 LT |
2516 | */ |
2517 | tty_unregister_device(drv->tty_driver, port->line); | |
2518 | ||
68ac64cd RK |
2519 | info = state->info; |
2520 | if (info && info->tty) | |
2521 | tty_vhangup(info->tty); | |
2522 | ||
2523 | /* | |
2524 | * All users of this port should now be disconnected from | |
2525 | * this driver, and the port shut down. We should be the | |
2526 | * only thread fiddling with this port from now on. | |
2527 | */ | |
2528 | state->info = NULL; | |
2529 | ||
2530 | /* | |
2531 | * Free the port IO and memory resources, if any. | |
2532 | */ | |
2533 | if (port->type != PORT_UNKNOWN) | |
2534 | port->ops->release_port(port); | |
2535 | ||
2536 | /* | |
2537 | * Indicate that there isn't a port here anymore. | |
2538 | */ | |
2539 | port->type = PORT_UNKNOWN; | |
2540 | ||
2541 | /* | |
2542 | * Kill the tasklet, and free resources. | |
2543 | */ | |
2544 | if (info) { | |
2545 | tasklet_kill(&info->tlet); | |
2546 | kfree(info); | |
2547 | } | |
2548 | ||
1da177e4 | 2549 | state->port = NULL; |
f392ecfa | 2550 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2551 | |
2552 | return 0; | |
2553 | } | |
2554 | ||
2555 | /* | |
2556 | * Are the two ports equivalent? | |
2557 | */ | |
2558 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2559 | { | |
2560 | if (port1->iotype != port2->iotype) | |
2561 | return 0; | |
2562 | ||
2563 | switch (port1->iotype) { | |
2564 | case UPIO_PORT: | |
2565 | return (port1->iobase == port2->iobase); | |
2566 | case UPIO_HUB6: | |
2567 | return (port1->iobase == port2->iobase) && | |
2568 | (port1->hub6 == port2->hub6); | |
2569 | case UPIO_MEM: | |
d21b55d3 SS |
2570 | case UPIO_MEM32: |
2571 | case UPIO_AU: | |
2572 | case UPIO_TSI: | |
beab697a | 2573 | case UPIO_DWAPB: |
1624f003 | 2574 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2575 | } |
2576 | return 0; | |
2577 | } | |
2578 | EXPORT_SYMBOL(uart_match_port); | |
2579 | ||
1da177e4 LT |
2580 | EXPORT_SYMBOL(uart_write_wakeup); |
2581 | EXPORT_SYMBOL(uart_register_driver); | |
2582 | EXPORT_SYMBOL(uart_unregister_driver); | |
2583 | EXPORT_SYMBOL(uart_suspend_port); | |
2584 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2585 | EXPORT_SYMBOL(uart_add_one_port); |
2586 | EXPORT_SYMBOL(uart_remove_one_port); | |
2587 | ||
2588 | MODULE_DESCRIPTION("Serial driver core"); | |
2589 | MODULE_LICENSE("GPL"); |