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 | ||
f751928e | 53 | #define uart_users(state) ((state)->count + (state)->info.port.blocked_open) |
1da177e4 LT |
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 | ||
f751928e | 97 | if (!uart_circ_empty(&state->info.xmit) && state->info.xmit.buf && |
1da177e4 | 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; | |
f751928e | 116 | tty_wakeup(state->info.port.tty); |
1da177e4 LT |
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 | |
df4f4dd4 | 138 | * will be serialised by the per-port mutex. |
1da177e4 LT |
139 | */ |
140 | static int uart_startup(struct uart_state *state, int init_hw) | |
141 | { | |
f751928e | 142 | struct uart_info *info = &state->info; |
1da177e4 LT |
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 | */ | |
df4f4dd4 | 155 | set_bit(TTY_IO_ERROR, &info->port.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) { | |
df4f4dd4 | 165 | /* This is protected by the per port mutex */ |
1da177e4 LT |
166 | page = get_zeroed_page(GFP_KERNEL); |
167 | if (!page) | |
168 | return -ENOMEM; | |
169 | ||
170 | info->xmit.buf = (unsigned char *) page; | |
171 | uart_circ_clear(&info->xmit); | |
172 | } | |
173 | ||
174 | retval = port->ops->startup(port); | |
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 | */ | |
df4f4dd4 | 186 | if (info->port.tty->termios->c_cflag & CBAUD) |
1da177e4 LT |
187 | uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); |
188 | } | |
189 | ||
0dd7a1ae RK |
190 | if (info->flags & UIF_CTS_FLOW) { |
191 | spin_lock_irq(&port->lock); | |
192 | if (!(port->ops->get_mctrl(port) & TIOCM_CTS)) | |
df4f4dd4 | 193 | info->port.tty->hw_stopped = 1; |
0dd7a1ae RK |
194 | spin_unlock_irq(&port->lock); |
195 | } | |
196 | ||
1da177e4 LT |
197 | info->flags |= UIF_INITIALIZED; |
198 | ||
df4f4dd4 | 199 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); |
1da177e4 LT |
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 | { | |
f751928e | 215 | struct uart_info *info = &state->info; |
1da177e4 | 216 | struct uart_port *port = state->port; |
f751928e | 217 | struct tty_struct *tty = info->port.tty; |
1da177e4 | 218 | |
1da177e4 | 219 | /* |
ee31b337 | 220 | * Set the TTY IO error marker |
1da177e4 | 221 | */ |
f751928e AC |
222 | if (tty) |
223 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 224 | |
ee31b337 RK |
225 | if (info->flags & UIF_INITIALIZED) { |
226 | info->flags &= ~UIF_INITIALIZED; | |
1da177e4 | 227 | |
ee31b337 RK |
228 | /* |
229 | * Turn off DTR and RTS early. | |
230 | */ | |
f751928e | 231 | if (!tty || (tty->termios->c_cflag & HUPCL)) |
ee31b337 RK |
232 | uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); |
233 | ||
234 | /* | |
235 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
236 | * the irq here so the queue might never be woken up. Note | |
237 | * that we won't end up waiting on delta_msr_wait again since | |
238 | * any outstanding file descriptors should be pointing at | |
239 | * hung_up_tty_fops now. | |
240 | */ | |
241 | wake_up_interruptible(&info->delta_msr_wait); | |
242 | ||
243 | /* | |
244 | * Free the IRQ and disable the port. | |
245 | */ | |
246 | port->ops->shutdown(port); | |
247 | ||
248 | /* | |
249 | * Ensure that the IRQ handler isn't running on another CPU. | |
250 | */ | |
251 | synchronize_irq(port->irq); | |
252 | } | |
1da177e4 LT |
253 | |
254 | /* | |
ee31b337 | 255 | * kill off our tasklet |
1da177e4 | 256 | */ |
ee31b337 | 257 | tasklet_kill(&info->tlet); |
1da177e4 LT |
258 | |
259 | /* | |
260 | * Free the transmit buffer page. | |
261 | */ | |
262 | if (info->xmit.buf) { | |
263 | free_page((unsigned long)info->xmit.buf); | |
264 | info->xmit.buf = NULL; | |
265 | } | |
1da177e4 LT |
266 | } |
267 | ||
268 | /** | |
269 | * uart_update_timeout - update per-port FIFO timeout. | |
270 | * @port: uart_port structure describing the port | |
271 | * @cflag: termios cflag value | |
272 | * @baud: speed of the port | |
273 | * | |
274 | * Set the port FIFO timeout value. The @cflag value should | |
275 | * reflect the actual hardware settings. | |
276 | */ | |
277 | void | |
278 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
279 | unsigned int baud) | |
280 | { | |
281 | unsigned int bits; | |
282 | ||
283 | /* byte size and parity */ | |
284 | switch (cflag & CSIZE) { | |
285 | case CS5: | |
286 | bits = 7; | |
287 | break; | |
288 | case CS6: | |
289 | bits = 8; | |
290 | break; | |
291 | case CS7: | |
292 | bits = 9; | |
293 | break; | |
294 | default: | |
295 | bits = 10; | |
a46c9994 | 296 | break; /* CS8 */ |
1da177e4 LT |
297 | } |
298 | ||
299 | if (cflag & CSTOPB) | |
300 | bits++; | |
301 | if (cflag & PARENB) | |
302 | bits++; | |
303 | ||
304 | /* | |
305 | * The total number of bits to be transmitted in the fifo. | |
306 | */ | |
307 | bits = bits * port->fifosize; | |
308 | ||
309 | /* | |
310 | * Figure the timeout to send the above number of bits. | |
311 | * Add .02 seconds of slop | |
312 | */ | |
313 | port->timeout = (HZ * bits) / baud + HZ/50; | |
314 | } | |
315 | ||
316 | EXPORT_SYMBOL(uart_update_timeout); | |
317 | ||
318 | /** | |
319 | * uart_get_baud_rate - return baud rate for a particular port | |
320 | * @port: uart_port structure describing the port in question. | |
321 | * @termios: desired termios settings. | |
322 | * @old: old termios (or NULL) | |
323 | * @min: minimum acceptable baud rate | |
324 | * @max: maximum acceptable baud rate | |
325 | * | |
326 | * Decode the termios structure into a numeric baud rate, | |
327 | * taking account of the magic 38400 baud rate (with spd_* | |
328 | * flags), and mapping the %B0 rate to 9600 baud. | |
329 | * | |
330 | * If the new baud rate is invalid, try the old termios setting. | |
331 | * If it's still invalid, we try 9600 baud. | |
332 | * | |
333 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
334 | * we're actually going to be using. Don't do this for the case |
335 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
336 | */ |
337 | unsigned int | |
606d099c AC |
338 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
339 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
340 | { |
341 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 342 | int hung_up = 0; |
0077d45e | 343 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
344 | |
345 | if (flags == UPF_SPD_HI) | |
346 | altbaud = 57600; | |
347 | if (flags == UPF_SPD_VHI) | |
348 | altbaud = 115200; | |
349 | if (flags == UPF_SPD_SHI) | |
350 | altbaud = 230400; | |
351 | if (flags == UPF_SPD_WARP) | |
352 | altbaud = 460800; | |
353 | ||
354 | for (try = 0; try < 2; try++) { | |
355 | baud = tty_termios_baud_rate(termios); | |
356 | ||
357 | /* | |
358 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
359 | * Die! Die! Die! | |
360 | */ | |
361 | if (baud == 38400) | |
362 | baud = altbaud; | |
363 | ||
364 | /* | |
365 | * Special case: B0 rate. | |
366 | */ | |
eb424fd2 AC |
367 | if (baud == 0) { |
368 | hung_up = 1; | |
1da177e4 | 369 | baud = 9600; |
eb424fd2 | 370 | } |
1da177e4 LT |
371 | |
372 | if (baud >= min && baud <= max) | |
373 | return baud; | |
374 | ||
375 | /* | |
376 | * Oops, the quotient was zero. Try again with | |
377 | * the old baud rate if possible. | |
378 | */ | |
379 | termios->c_cflag &= ~CBAUD; | |
380 | if (old) { | |
6d4d67be | 381 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
382 | if (!hung_up) |
383 | tty_termios_encode_baud_rate(termios, | |
384 | baud, baud); | |
1da177e4 LT |
385 | old = NULL; |
386 | continue; | |
387 | } | |
388 | ||
389 | /* | |
390 | * As a last resort, if the quotient is zero, | |
391 | * default to 9600 bps | |
392 | */ | |
eb424fd2 AC |
393 | if (!hung_up) |
394 | tty_termios_encode_baud_rate(termios, 9600, 9600); | |
1da177e4 LT |
395 | } |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | EXPORT_SYMBOL(uart_get_baud_rate); | |
401 | ||
402 | /** | |
403 | * uart_get_divisor - return uart clock divisor | |
404 | * @port: uart_port structure describing the port. | |
405 | * @baud: desired baud rate | |
406 | * | |
407 | * Calculate the uart clock divisor for the port. | |
408 | */ | |
409 | unsigned int | |
410 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
411 | { | |
412 | unsigned int quot; | |
413 | ||
414 | /* | |
415 | * Old custom speed handling. | |
416 | */ | |
417 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
418 | quot = port->custom_divisor; | |
419 | else | |
420 | quot = (port->uartclk + (8 * baud)) / (16 * baud); | |
421 | ||
422 | return quot; | |
423 | } | |
424 | ||
425 | EXPORT_SYMBOL(uart_get_divisor); | |
426 | ||
23d22cea | 427 | /* FIXME: Consistent locking policy */ |
1da177e4 | 428 | static void |
606d099c | 429 | uart_change_speed(struct uart_state *state, struct ktermios *old_termios) |
1da177e4 | 430 | { |
f751928e | 431 | struct tty_struct *tty = state->info.port.tty; |
1da177e4 | 432 | struct uart_port *port = state->port; |
606d099c | 433 | struct ktermios *termios; |
1da177e4 LT |
434 | |
435 | /* | |
436 | * If we have no tty, termios, or the port does not exist, | |
437 | * then we can't set the parameters for this port. | |
438 | */ | |
439 | if (!tty || !tty->termios || port->type == PORT_UNKNOWN) | |
440 | return; | |
441 | ||
442 | termios = tty->termios; | |
443 | ||
444 | /* | |
445 | * Set flags based on termios cflag | |
446 | */ | |
447 | if (termios->c_cflag & CRTSCTS) | |
f751928e | 448 | state->info.flags |= UIF_CTS_FLOW; |
1da177e4 | 449 | else |
f751928e | 450 | state->info.flags &= ~UIF_CTS_FLOW; |
1da177e4 LT |
451 | |
452 | if (termios->c_cflag & CLOCAL) | |
f751928e | 453 | state->info.flags &= ~UIF_CHECK_CD; |
1da177e4 | 454 | else |
f751928e | 455 | state->info.flags |= UIF_CHECK_CD; |
1da177e4 LT |
456 | |
457 | port->ops->set_termios(port, termios, old_termios); | |
458 | } | |
459 | ||
23d22cea | 460 | static inline int |
1da177e4 LT |
461 | __uart_put_char(struct uart_port *port, struct circ_buf *circ, unsigned char c) |
462 | { | |
463 | unsigned long flags; | |
23d22cea | 464 | int ret = 0; |
1da177e4 LT |
465 | |
466 | if (!circ->buf) | |
23d22cea | 467 | return 0; |
1da177e4 LT |
468 | |
469 | spin_lock_irqsave(&port->lock, flags); | |
470 | if (uart_circ_chars_free(circ) != 0) { | |
471 | circ->buf[circ->head] = c; | |
472 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 473 | ret = 1; |
1da177e4 LT |
474 | } |
475 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 476 | return ret; |
1da177e4 LT |
477 | } |
478 | ||
23d22cea | 479 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
480 | { |
481 | struct uart_state *state = tty->driver_data; | |
482 | ||
f751928e | 483 | return __uart_put_char(state->port, &state->info.xmit, ch); |
1da177e4 LT |
484 | } |
485 | ||
486 | static void uart_flush_chars(struct tty_struct *tty) | |
487 | { | |
488 | uart_start(tty); | |
489 | } | |
490 | ||
491 | static int | |
d5f735e5 | 492 | uart_write(struct tty_struct *tty, const unsigned char *buf, int count) |
1da177e4 LT |
493 | { |
494 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
495 | struct uart_port *port; |
496 | struct circ_buf *circ; | |
1da177e4 LT |
497 | unsigned long flags; |
498 | int c, ret = 0; | |
499 | ||
d5f735e5 PM |
500 | /* |
501 | * This means you called this function _after_ the port was | |
502 | * closed. No cookie for you. | |
503 | */ | |
f751928e | 504 | if (!state) { |
d5f735e5 PM |
505 | WARN_ON(1); |
506 | return -EL3HLT; | |
507 | } | |
508 | ||
509 | port = state->port; | |
f751928e | 510 | circ = &state->info.xmit; |
d5f735e5 | 511 | |
1da177e4 LT |
512 | if (!circ->buf) |
513 | return 0; | |
514 | ||
515 | spin_lock_irqsave(&port->lock, flags); | |
516 | while (1) { | |
517 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
518 | if (count < c) | |
519 | c = count; | |
520 | if (c <= 0) | |
521 | break; | |
522 | memcpy(circ->buf + circ->head, buf, c); | |
523 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
524 | buf += c; | |
525 | count -= c; | |
526 | ret += c; | |
527 | } | |
528 | spin_unlock_irqrestore(&port->lock, flags); | |
529 | ||
530 | uart_start(tty); | |
531 | return ret; | |
532 | } | |
533 | ||
534 | static int uart_write_room(struct tty_struct *tty) | |
535 | { | |
536 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
537 | unsigned long flags; |
538 | int ret; | |
1da177e4 | 539 | |
f34d7a5b | 540 | spin_lock_irqsave(&state->port->lock, flags); |
f751928e | 541 | ret = uart_circ_chars_free(&state->info.xmit); |
f34d7a5b AC |
542 | spin_unlock_irqrestore(&state->port->lock, flags); |
543 | return ret; | |
1da177e4 LT |
544 | } |
545 | ||
546 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
547 | { | |
548 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
549 | unsigned long flags; |
550 | int ret; | |
1da177e4 | 551 | |
f34d7a5b | 552 | spin_lock_irqsave(&state->port->lock, flags); |
f751928e | 553 | ret = uart_circ_chars_pending(&state->info.xmit); |
f34d7a5b AC |
554 | spin_unlock_irqrestore(&state->port->lock, flags); |
555 | return ret; | |
1da177e4 LT |
556 | } |
557 | ||
558 | static void uart_flush_buffer(struct tty_struct *tty) | |
559 | { | |
560 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 561 | struct uart_port *port; |
1da177e4 LT |
562 | unsigned long flags; |
563 | ||
d5f735e5 PM |
564 | /* |
565 | * This means you called this function _after_ the port was | |
566 | * closed. No cookie for you. | |
567 | */ | |
f751928e | 568 | if (!state) { |
d5f735e5 PM |
569 | WARN_ON(1); |
570 | return; | |
571 | } | |
572 | ||
55d7b689 | 573 | port = state->port; |
eb3a1e11 | 574 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
575 | |
576 | spin_lock_irqsave(&port->lock, flags); | |
f751928e | 577 | uart_circ_clear(&state->info.xmit); |
6bb0e3a5 HS |
578 | if (port->ops->flush_buffer) |
579 | port->ops->flush_buffer(port); | |
1da177e4 LT |
580 | spin_unlock_irqrestore(&port->lock, flags); |
581 | tty_wakeup(tty); | |
582 | } | |
583 | ||
584 | /* | |
585 | * This function is used to send a high-priority XON/XOFF character to | |
586 | * the device | |
587 | */ | |
588 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
589 | { | |
590 | struct uart_state *state = tty->driver_data; | |
591 | struct uart_port *port = state->port; | |
592 | unsigned long flags; | |
593 | ||
594 | if (port->ops->send_xchar) | |
595 | port->ops->send_xchar(port, ch); | |
596 | else { | |
597 | port->x_char = ch; | |
598 | if (ch) { | |
599 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 600 | port->ops->start_tx(port); |
1da177e4 LT |
601 | spin_unlock_irqrestore(&port->lock, flags); |
602 | } | |
603 | } | |
604 | } | |
605 | ||
606 | static void uart_throttle(struct tty_struct *tty) | |
607 | { | |
608 | struct uart_state *state = tty->driver_data; | |
609 | ||
610 | if (I_IXOFF(tty)) | |
611 | uart_send_xchar(tty, STOP_CHAR(tty)); | |
612 | ||
613 | if (tty->termios->c_cflag & CRTSCTS) | |
614 | uart_clear_mctrl(state->port, TIOCM_RTS); | |
615 | } | |
616 | ||
617 | static void uart_unthrottle(struct tty_struct *tty) | |
618 | { | |
619 | struct uart_state *state = tty->driver_data; | |
620 | struct uart_port *port = state->port; | |
621 | ||
622 | if (I_IXOFF(tty)) { | |
623 | if (port->x_char) | |
624 | port->x_char = 0; | |
625 | else | |
626 | uart_send_xchar(tty, START_CHAR(tty)); | |
627 | } | |
628 | ||
629 | if (tty->termios->c_cflag & CRTSCTS) | |
630 | uart_set_mctrl(port, TIOCM_RTS); | |
631 | } | |
632 | ||
633 | static int uart_get_info(struct uart_state *state, | |
634 | struct serial_struct __user *retinfo) | |
635 | { | |
636 | struct uart_port *port = state->port; | |
637 | struct serial_struct tmp; | |
638 | ||
639 | memset(&tmp, 0, sizeof(tmp)); | |
f34d7a5b AC |
640 | |
641 | /* Ensure the state we copy is consistent and no hardware changes | |
642 | occur as we go */ | |
643 | mutex_lock(&state->mutex); | |
644 | ||
1da177e4 LT |
645 | tmp.type = port->type; |
646 | tmp.line = port->line; | |
647 | tmp.port = port->iobase; | |
648 | if (HIGH_BITS_OFFSET) | |
649 | tmp.port_high = (long) port->iobase >> HIGH_BITS_OFFSET; | |
650 | tmp.irq = port->irq; | |
651 | tmp.flags = port->flags; | |
652 | tmp.xmit_fifo_size = port->fifosize; | |
653 | tmp.baud_base = port->uartclk / 16; | |
654 | tmp.close_delay = state->close_delay / 10; | |
655 | tmp.closing_wait = state->closing_wait == USF_CLOSING_WAIT_NONE ? | |
656 | ASYNC_CLOSING_WAIT_NONE : | |
a46c9994 | 657 | state->closing_wait / 10; |
1da177e4 LT |
658 | tmp.custom_divisor = port->custom_divisor; |
659 | tmp.hub6 = port->hub6; | |
660 | tmp.io_type = port->iotype; | |
661 | tmp.iomem_reg_shift = port->regshift; | |
4f640efb | 662 | tmp.iomem_base = (void *)(unsigned long)port->mapbase; |
1da177e4 | 663 | |
f34d7a5b AC |
664 | mutex_unlock(&state->mutex); |
665 | ||
1da177e4 LT |
666 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
667 | return -EFAULT; | |
668 | return 0; | |
669 | } | |
670 | ||
671 | static int uart_set_info(struct uart_state *state, | |
672 | struct serial_struct __user *newinfo) | |
673 | { | |
674 | struct serial_struct new_serial; | |
675 | struct uart_port *port = state->port; | |
676 | unsigned long new_port; | |
0077d45e | 677 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 678 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 679 | upf_t old_flags, new_flags; |
1da177e4 LT |
680 | int retval = 0; |
681 | ||
682 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
683 | return -EFAULT; | |
684 | ||
685 | new_port = new_serial.port; | |
686 | if (HIGH_BITS_OFFSET) | |
687 | new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; | |
688 | ||
689 | new_serial.irq = irq_canonicalize(new_serial.irq); | |
690 | close_delay = new_serial.close_delay * 10; | |
691 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
692 | USF_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; | |
693 | ||
694 | /* | |
695 | * This semaphore protects state->count. It is also | |
696 | * very useful to prevent opens. Also, take the | |
697 | * port configuration semaphore to make sure that a | |
698 | * module insertion/removal doesn't change anything | |
699 | * under us. | |
700 | */ | |
e2862f6a | 701 | mutex_lock(&state->mutex); |
1da177e4 | 702 | |
abb4a239 DG |
703 | change_irq = !(port->flags & UPF_FIXED_PORT) |
704 | && new_serial.irq != port->irq; | |
1da177e4 LT |
705 | |
706 | /* | |
707 | * Since changing the 'type' of the port changes its resource | |
708 | * allocations, we should treat type changes the same as | |
709 | * IO port changes. | |
710 | */ | |
abb4a239 DG |
711 | change_port = !(port->flags & UPF_FIXED_PORT) |
712 | && (new_port != port->iobase || | |
713 | (unsigned long)new_serial.iomem_base != port->mapbase || | |
714 | new_serial.hub6 != port->hub6 || | |
715 | new_serial.io_type != port->iotype || | |
716 | new_serial.iomem_reg_shift != port->regshift || | |
717 | new_serial.type != port->type); | |
1da177e4 LT |
718 | |
719 | old_flags = port->flags; | |
0077d45e | 720 | new_flags = new_serial.flags; |
1da177e4 LT |
721 | old_custom_divisor = port->custom_divisor; |
722 | ||
723 | if (!capable(CAP_SYS_ADMIN)) { | |
724 | retval = -EPERM; | |
725 | if (change_irq || change_port || | |
726 | (new_serial.baud_base != port->uartclk / 16) || | |
727 | (close_delay != state->close_delay) || | |
728 | (closing_wait != state->closing_wait) || | |
947deee8 RK |
729 | (new_serial.xmit_fifo_size && |
730 | new_serial.xmit_fifo_size != port->fifosize) || | |
0077d45e | 731 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 LT |
732 | goto exit; |
733 | port->flags = ((port->flags & ~UPF_USR_MASK) | | |
0077d45e | 734 | (new_flags & UPF_USR_MASK)); |
1da177e4 LT |
735 | port->custom_divisor = new_serial.custom_divisor; |
736 | goto check_and_exit; | |
737 | } | |
738 | ||
739 | /* | |
740 | * Ask the low level driver to verify the settings. | |
741 | */ | |
742 | if (port->ops->verify_port) | |
743 | retval = port->ops->verify_port(port, &new_serial); | |
744 | ||
a62c4133 | 745 | if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || |
1da177e4 LT |
746 | (new_serial.baud_base < 9600)) |
747 | retval = -EINVAL; | |
748 | ||
749 | if (retval) | |
750 | goto exit; | |
751 | ||
752 | if (change_port || change_irq) { | |
753 | retval = -EBUSY; | |
754 | ||
755 | /* | |
756 | * Make sure that we are the sole user of this port. | |
757 | */ | |
758 | if (uart_users(state) > 1) | |
759 | goto exit; | |
760 | ||
761 | /* | |
762 | * We need to shutdown the serial port at the old | |
763 | * port/type/irq combination. | |
764 | */ | |
765 | uart_shutdown(state); | |
766 | } | |
767 | ||
768 | if (change_port) { | |
769 | unsigned long old_iobase, old_mapbase; | |
770 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
771 | ||
772 | old_iobase = port->iobase; | |
773 | old_mapbase = port->mapbase; | |
774 | old_type = port->type; | |
775 | old_hub6 = port->hub6; | |
776 | old_iotype = port->iotype; | |
777 | old_shift = port->regshift; | |
778 | ||
779 | /* | |
780 | * Free and release old regions | |
781 | */ | |
782 | if (old_type != PORT_UNKNOWN) | |
783 | port->ops->release_port(port); | |
784 | ||
785 | port->iobase = new_port; | |
786 | port->type = new_serial.type; | |
787 | port->hub6 = new_serial.hub6; | |
788 | port->iotype = new_serial.io_type; | |
789 | port->regshift = new_serial.iomem_reg_shift; | |
790 | port->mapbase = (unsigned long)new_serial.iomem_base; | |
791 | ||
792 | /* | |
793 | * Claim and map the new regions | |
794 | */ | |
795 | if (port->type != PORT_UNKNOWN) { | |
796 | retval = port->ops->request_port(port); | |
797 | } else { | |
798 | /* Always success - Jean II */ | |
799 | retval = 0; | |
800 | } | |
801 | ||
802 | /* | |
803 | * If we fail to request resources for the | |
804 | * new port, try to restore the old settings. | |
805 | */ | |
806 | if (retval && old_type != PORT_UNKNOWN) { | |
807 | port->iobase = old_iobase; | |
808 | port->type = old_type; | |
809 | port->hub6 = old_hub6; | |
810 | port->iotype = old_iotype; | |
811 | port->regshift = old_shift; | |
812 | port->mapbase = old_mapbase; | |
813 | retval = port->ops->request_port(port); | |
814 | /* | |
815 | * If we failed to restore the old settings, | |
816 | * we fail like this. | |
817 | */ | |
818 | if (retval) | |
819 | port->type = PORT_UNKNOWN; | |
820 | ||
821 | /* | |
822 | * We failed anyway. | |
823 | */ | |
824 | retval = -EBUSY; | |
a46c9994 AC |
825 | /* Added to return the correct error -Ram Gupta */ |
826 | goto exit; | |
1da177e4 LT |
827 | } |
828 | } | |
829 | ||
abb4a239 DG |
830 | if (change_irq) |
831 | port->irq = new_serial.irq; | |
832 | if (!(port->flags & UPF_FIXED_PORT)) | |
833 | port->uartclk = new_serial.baud_base * 16; | |
1da177e4 | 834 | port->flags = (port->flags & ~UPF_CHANGE_MASK) | |
0077d45e | 835 | (new_flags & UPF_CHANGE_MASK); |
1da177e4 LT |
836 | port->custom_divisor = new_serial.custom_divisor; |
837 | state->close_delay = close_delay; | |
838 | state->closing_wait = closing_wait; | |
947deee8 RK |
839 | if (new_serial.xmit_fifo_size) |
840 | port->fifosize = new_serial.xmit_fifo_size; | |
f751928e AC |
841 | if (state->info.port.tty) |
842 | state->info.port.tty->low_latency = | |
1da177e4 LT |
843 | (port->flags & UPF_LOW_LATENCY) ? 1 : 0; |
844 | ||
845 | check_and_exit: | |
846 | retval = 0; | |
847 | if (port->type == PORT_UNKNOWN) | |
848 | goto exit; | |
f751928e | 849 | if (state->info.flags & UIF_INITIALIZED) { |
1da177e4 LT |
850 | if (((old_flags ^ port->flags) & UPF_SPD_MASK) || |
851 | old_custom_divisor != port->custom_divisor) { | |
852 | /* | |
853 | * If they're setting up a custom divisor or speed, | |
854 | * instead of clearing it, then bitch about it. No | |
855 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
856 | */ | |
857 | if (port->flags & UPF_SPD_MASK) { | |
858 | char buf[64]; | |
859 | printk(KERN_NOTICE | |
860 | "%s sets custom speed on %s. This " | |
861 | "is deprecated.\n", current->comm, | |
f751928e | 862 | tty_name(state->info.port.tty, buf)); |
1da177e4 LT |
863 | } |
864 | uart_change_speed(state, NULL); | |
865 | } | |
866 | } else | |
867 | retval = uart_startup(state, 1); | |
868 | exit: | |
e2862f6a | 869 | mutex_unlock(&state->mutex); |
1da177e4 LT |
870 | return retval; |
871 | } | |
872 | ||
873 | ||
874 | /* | |
875 | * uart_get_lsr_info - get line status register info. | |
876 | * Note: uart_ioctl protects us against hangups. | |
877 | */ | |
878 | static int uart_get_lsr_info(struct uart_state *state, | |
879 | unsigned int __user *value) | |
880 | { | |
881 | struct uart_port *port = state->port; | |
882 | unsigned int result; | |
883 | ||
884 | result = port->ops->tx_empty(port); | |
885 | ||
886 | /* | |
887 | * If we're about to load something into the transmit | |
888 | * register, we'll pretend the transmitter isn't empty to | |
889 | * avoid a race condition (depending on when the transmit | |
890 | * interrupt happens). | |
891 | */ | |
892 | if (port->x_char || | |
f751928e AC |
893 | ((uart_circ_chars_pending(&state->info.xmit) > 0) && |
894 | !state->info.port.tty->stopped && !state->info.port.tty->hw_stopped)) | |
1da177e4 | 895 | result &= ~TIOCSER_TEMT; |
a46c9994 | 896 | |
1da177e4 LT |
897 | return put_user(result, value); |
898 | } | |
899 | ||
900 | static int uart_tiocmget(struct tty_struct *tty, struct file *file) | |
901 | { | |
902 | struct uart_state *state = tty->driver_data; | |
903 | struct uart_port *port = state->port; | |
904 | int result = -EIO; | |
905 | ||
e2862f6a | 906 | mutex_lock(&state->mutex); |
1da177e4 LT |
907 | if ((!file || !tty_hung_up_p(file)) && |
908 | !(tty->flags & (1 << TTY_IO_ERROR))) { | |
909 | result = port->mctrl; | |
c5f4644e RK |
910 | |
911 | spin_lock_irq(&port->lock); | |
1da177e4 | 912 | result |= port->ops->get_mctrl(port); |
c5f4644e | 913 | spin_unlock_irq(&port->lock); |
1da177e4 | 914 | } |
e2862f6a | 915 | mutex_unlock(&state->mutex); |
1da177e4 LT |
916 | |
917 | return result; | |
918 | } | |
919 | ||
920 | static int | |
921 | uart_tiocmset(struct tty_struct *tty, struct file *file, | |
922 | unsigned int set, unsigned int clear) | |
923 | { | |
924 | struct uart_state *state = tty->driver_data; | |
925 | struct uart_port *port = state->port; | |
926 | int ret = -EIO; | |
927 | ||
e2862f6a | 928 | mutex_lock(&state->mutex); |
1da177e4 LT |
929 | if ((!file || !tty_hung_up_p(file)) && |
930 | !(tty->flags & (1 << TTY_IO_ERROR))) { | |
931 | uart_update_mctrl(port, set, clear); | |
932 | ret = 0; | |
933 | } | |
e2862f6a | 934 | mutex_unlock(&state->mutex); |
1da177e4 LT |
935 | return ret; |
936 | } | |
937 | ||
9e98966c | 938 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
939 | { |
940 | struct uart_state *state = tty->driver_data; | |
941 | struct uart_port *port = state->port; | |
942 | ||
e2862f6a | 943 | mutex_lock(&state->mutex); |
1da177e4 LT |
944 | |
945 | if (port->type != PORT_UNKNOWN) | |
946 | port->ops->break_ctl(port, break_state); | |
947 | ||
e2862f6a | 948 | mutex_unlock(&state->mutex); |
9e98966c | 949 | return 0; |
1da177e4 LT |
950 | } |
951 | ||
952 | static int uart_do_autoconfig(struct uart_state *state) | |
953 | { | |
954 | struct uart_port *port = state->port; | |
955 | int flags, ret; | |
956 | ||
957 | if (!capable(CAP_SYS_ADMIN)) | |
958 | return -EPERM; | |
959 | ||
960 | /* | |
961 | * Take the per-port semaphore. This prevents count from | |
962 | * changing, and hence any extra opens of the port while | |
963 | * we're auto-configuring. | |
964 | */ | |
e2862f6a | 965 | if (mutex_lock_interruptible(&state->mutex)) |
1da177e4 LT |
966 | return -ERESTARTSYS; |
967 | ||
968 | ret = -EBUSY; | |
969 | if (uart_users(state) == 1) { | |
970 | uart_shutdown(state); | |
971 | ||
972 | /* | |
973 | * If we already have a port type configured, | |
974 | * we must release its resources. | |
975 | */ | |
976 | if (port->type != PORT_UNKNOWN) | |
977 | port->ops->release_port(port); | |
978 | ||
979 | flags = UART_CONFIG_TYPE; | |
980 | if (port->flags & UPF_AUTO_IRQ) | |
981 | flags |= UART_CONFIG_IRQ; | |
982 | ||
983 | /* | |
984 | * This will claim the ports resources if | |
985 | * a port is found. | |
986 | */ | |
987 | port->ops->config_port(port, flags); | |
988 | ||
989 | ret = uart_startup(state, 1); | |
990 | } | |
e2862f6a | 991 | mutex_unlock(&state->mutex); |
1da177e4 LT |
992 | return ret; |
993 | } | |
994 | ||
995 | /* | |
996 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
997 | * - mask passed in arg for lines of interest | |
998 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
999 | * Caller should use TIOCGICOUNT to see which one it was | |
1000 | */ | |
1001 | static int | |
1002 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
1003 | { | |
1004 | struct uart_port *port = state->port; | |
1005 | DECLARE_WAITQUEUE(wait, current); | |
1006 | struct uart_icount cprev, cnow; | |
1007 | int ret; | |
1008 | ||
1009 | /* | |
1010 | * note the counters on entry | |
1011 | */ | |
1012 | spin_lock_irq(&port->lock); | |
1013 | memcpy(&cprev, &port->icount, sizeof(struct uart_icount)); | |
1014 | ||
1015 | /* | |
1016 | * Force modem status interrupts on | |
1017 | */ | |
1018 | port->ops->enable_ms(port); | |
1019 | spin_unlock_irq(&port->lock); | |
1020 | ||
f751928e | 1021 | add_wait_queue(&state->info.delta_msr_wait, &wait); |
1da177e4 LT |
1022 | for (;;) { |
1023 | spin_lock_irq(&port->lock); | |
1024 | memcpy(&cnow, &port->icount, sizeof(struct uart_icount)); | |
1025 | spin_unlock_irq(&port->lock); | |
1026 | ||
1027 | set_current_state(TASK_INTERRUPTIBLE); | |
1028 | ||
1029 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1030 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1031 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1032 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1033 | ret = 0; |
1034 | break; | |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | schedule(); | |
1038 | ||
1039 | /* see if a signal did it */ | |
1040 | if (signal_pending(current)) { | |
1041 | ret = -ERESTARTSYS; | |
1042 | break; | |
1043 | } | |
1044 | ||
1045 | cprev = cnow; | |
1046 | } | |
1047 | ||
1048 | current->state = TASK_RUNNING; | |
f751928e | 1049 | remove_wait_queue(&state->info.delta_msr_wait, &wait); |
1da177e4 LT |
1050 | |
1051 | return ret; | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1056 | * Return: write counters to the user passed counter struct | |
1057 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1058 | * RI where only 0->1 is counted. | |
1059 | */ | |
1060 | static int uart_get_count(struct uart_state *state, | |
1061 | struct serial_icounter_struct __user *icnt) | |
1062 | { | |
1063 | struct serial_icounter_struct icount; | |
1064 | struct uart_icount cnow; | |
1065 | struct uart_port *port = state->port; | |
1066 | ||
1067 | spin_lock_irq(&port->lock); | |
1068 | memcpy(&cnow, &port->icount, sizeof(struct uart_icount)); | |
1069 | spin_unlock_irq(&port->lock); | |
1070 | ||
1071 | icount.cts = cnow.cts; | |
1072 | icount.dsr = cnow.dsr; | |
1073 | icount.rng = cnow.rng; | |
1074 | icount.dcd = cnow.dcd; | |
1075 | icount.rx = cnow.rx; | |
1076 | icount.tx = cnow.tx; | |
1077 | icount.frame = cnow.frame; | |
1078 | icount.overrun = cnow.overrun; | |
1079 | icount.parity = cnow.parity; | |
1080 | icount.brk = cnow.brk; | |
1081 | icount.buf_overrun = cnow.buf_overrun; | |
1082 | ||
1083 | return copy_to_user(icnt, &icount, sizeof(icount)) ? -EFAULT : 0; | |
1084 | } | |
1085 | ||
1086 | /* | |
e5238442 | 1087 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1088 | */ |
1089 | static int | |
1090 | uart_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, | |
1091 | unsigned long arg) | |
1092 | { | |
1093 | struct uart_state *state = tty->driver_data; | |
1094 | void __user *uarg = (void __user *)arg; | |
1095 | int ret = -ENOIOCTLCMD; | |
1096 | ||
1da177e4 LT |
1097 | |
1098 | /* | |
1099 | * These ioctls don't rely on the hardware to be present. | |
1100 | */ | |
1101 | switch (cmd) { | |
1102 | case TIOCGSERIAL: | |
1103 | ret = uart_get_info(state, uarg); | |
1104 | break; | |
1105 | ||
1106 | case TIOCSSERIAL: | |
1107 | ret = uart_set_info(state, uarg); | |
1108 | break; | |
1109 | ||
1110 | case TIOCSERCONFIG: | |
1111 | ret = uart_do_autoconfig(state); | |
1112 | break; | |
1113 | ||
1114 | case TIOCSERGWILD: /* obsolete */ | |
1115 | case TIOCSERSWILD: /* obsolete */ | |
1116 | ret = 0; | |
1117 | break; | |
1118 | } | |
1119 | ||
1120 | if (ret != -ENOIOCTLCMD) | |
1121 | goto out; | |
1122 | ||
1123 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1124 | ret = -EIO; | |
1125 | goto out; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * The following should only be used when hardware is present. | |
1130 | */ | |
1131 | switch (cmd) { | |
1132 | case TIOCMIWAIT: | |
1133 | ret = uart_wait_modem_status(state, arg); | |
1134 | break; | |
1135 | ||
1136 | case TIOCGICOUNT: | |
1137 | ret = uart_get_count(state, uarg); | |
1138 | break; | |
1139 | } | |
1140 | ||
1141 | if (ret != -ENOIOCTLCMD) | |
1142 | goto out; | |
1143 | ||
e2862f6a | 1144 | mutex_lock(&state->mutex); |
1da177e4 LT |
1145 | |
1146 | if (tty_hung_up_p(filp)) { | |
1147 | ret = -EIO; | |
1148 | goto out_up; | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * All these rely on hardware being present and need to be | |
1153 | * protected against the tty being hung up. | |
1154 | */ | |
1155 | switch (cmd) { | |
1156 | case TIOCSERGETLSR: /* Get line status register */ | |
1157 | ret = uart_get_lsr_info(state, uarg); | |
1158 | break; | |
1159 | ||
1160 | default: { | |
1161 | struct uart_port *port = state->port; | |
1162 | if (port->ops->ioctl) | |
1163 | ret = port->ops->ioctl(port, cmd, arg); | |
1164 | break; | |
1165 | } | |
1166 | } | |
f34d7a5b | 1167 | out_up: |
e2862f6a | 1168 | mutex_unlock(&state->mutex); |
f34d7a5b | 1169 | out: |
1da177e4 LT |
1170 | return ret; |
1171 | } | |
1172 | ||
edeb280e | 1173 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1174 | { |
1175 | struct uart_state *state = tty->driver_data; | |
1176 | struct uart_port *port = state->port; | |
1177 | ||
1178 | if (port->ops->set_ldisc) | |
1179 | port->ops->set_ldisc(port); | |
1180 | } | |
1181 | ||
a46c9994 AC |
1182 | static void uart_set_termios(struct tty_struct *tty, |
1183 | struct ktermios *old_termios) | |
1da177e4 LT |
1184 | { |
1185 | struct uart_state *state = tty->driver_data; | |
1186 | unsigned long flags; | |
1187 | unsigned int cflag = tty->termios->c_cflag; | |
1188 | ||
1da177e4 LT |
1189 | |
1190 | /* | |
1191 | * These are the bits that are used to setup various | |
20620d68 DW |
1192 | * flags in the low level driver. We can ignore the Bfoo |
1193 | * bits in c_cflag; c_[io]speed will always be set | |
1194 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 LT |
1195 | */ |
1196 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
1da177e4 | 1197 | if ((cflag ^ old_termios->c_cflag) == 0 && |
20620d68 DW |
1198 | tty->termios->c_ospeed == old_termios->c_ospeed && |
1199 | tty->termios->c_ispeed == old_termios->c_ispeed && | |
e5238442 | 1200 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { |
1da177e4 | 1201 | return; |
e5238442 | 1202 | } |
1da177e4 LT |
1203 | |
1204 | uart_change_speed(state, old_termios); | |
1205 | ||
1206 | /* Handle transition to B0 status */ | |
1207 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
1208 | uart_clear_mctrl(state->port, TIOCM_RTS | TIOCM_DTR); | |
1209 | ||
1210 | /* Handle transition away from B0 status */ | |
1211 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { | |
1212 | unsigned int mask = TIOCM_DTR; | |
1213 | if (!(cflag & CRTSCTS) || | |
1214 | !test_bit(TTY_THROTTLED, &tty->flags)) | |
1215 | mask |= TIOCM_RTS; | |
1216 | uart_set_mctrl(state->port, mask); | |
1217 | } | |
1218 | ||
1219 | /* Handle turning off CRTSCTS */ | |
1220 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
1221 | spin_lock_irqsave(&state->port->lock, flags); | |
1222 | tty->hw_stopped = 0; | |
1223 | __uart_start(tty); | |
1224 | spin_unlock_irqrestore(&state->port->lock, flags); | |
1225 | } | |
1226 | ||
0dd7a1ae RK |
1227 | /* Handle turning on CRTSCTS */ |
1228 | if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { | |
1229 | spin_lock_irqsave(&state->port->lock, flags); | |
1230 | if (!(state->port->ops->get_mctrl(state->port) & TIOCM_CTS)) { | |
1231 | tty->hw_stopped = 1; | |
b129a8cc | 1232 | state->port->ops->stop_tx(state->port); |
0dd7a1ae RK |
1233 | } |
1234 | spin_unlock_irqrestore(&state->port->lock, flags); | |
1235 | } | |
1da177e4 LT |
1236 | #if 0 |
1237 | /* | |
1238 | * No need to wake up processes in open wait, since they | |
1239 | * sample the CLOCAL flag once, and don't recheck it. | |
1240 | * XXX It's not clear whether the current behavior is correct | |
1241 | * or not. Hence, this may change..... | |
1242 | */ | |
1243 | if (!(old_termios->c_cflag & CLOCAL) && | |
1244 | (tty->termios->c_cflag & CLOCAL)) | |
f751928e | 1245 | wake_up_interruptible(&info->port.open_wait); |
1da177e4 LT |
1246 | #endif |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | * In 2.4.5, calls to this will be serialized via the BKL in | |
1251 | * linux/drivers/char/tty_io.c:tty_release() | |
1252 | * linux/drivers/char/tty_io.c:do_tty_handup() | |
1253 | */ | |
1254 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1255 | { | |
1256 | struct uart_state *state = tty->driver_data; | |
1257 | struct uart_port *port; | |
a46c9994 | 1258 | |
1da177e4 LT |
1259 | BUG_ON(!kernel_locked()); |
1260 | ||
1261 | if (!state || !state->port) | |
1262 | return; | |
1263 | ||
1264 | port = state->port; | |
1265 | ||
eb3a1e11 | 1266 | pr_debug("uart_close(%d) called\n", port->line); |
1da177e4 | 1267 | |
e2862f6a | 1268 | mutex_lock(&state->mutex); |
1da177e4 LT |
1269 | |
1270 | if (tty_hung_up_p(filp)) | |
1271 | goto done; | |
1272 | ||
1273 | if ((tty->count == 1) && (state->count != 1)) { | |
1274 | /* | |
1275 | * Uh, oh. tty->count is 1, which means that the tty | |
1276 | * structure will be freed. state->count should always | |
1277 | * be one in these conditions. If it's greater than | |
1278 | * one, we've got real problems, since it means the | |
1279 | * serial port won't be shutdown. | |
1280 | */ | |
1281 | printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, " | |
1282 | "state->count is %d\n", state->count); | |
1283 | state->count = 1; | |
1284 | } | |
1285 | if (--state->count < 0) { | |
1286 | printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n", | |
1287 | tty->name, state->count); | |
1288 | state->count = 0; | |
1289 | } | |
1290 | if (state->count) | |
1291 | goto done; | |
1292 | ||
1293 | /* | |
1294 | * Now we wait for the transmit buffer to clear; and we notify | |
1295 | * the line discipline to only process XON/XOFF characters by | |
1296 | * setting tty->closing. | |
1297 | */ | |
1298 | tty->closing = 1; | |
1299 | ||
1300 | if (state->closing_wait != USF_CLOSING_WAIT_NONE) | |
1301 | tty_wait_until_sent(tty, msecs_to_jiffies(state->closing_wait)); | |
1302 | ||
1303 | /* | |
1304 | * At this point, we stop accepting input. To do this, we | |
1305 | * disable the receive line status interrupts. | |
1306 | */ | |
f751928e | 1307 | if (state->info.flags & UIF_INITIALIZED) { |
1da177e4 LT |
1308 | unsigned long flags; |
1309 | spin_lock_irqsave(&port->lock, flags); | |
1310 | port->ops->stop_rx(port); | |
1311 | spin_unlock_irqrestore(&port->lock, flags); | |
1312 | /* | |
1313 | * Before we drop DTR, make sure the UART transmitter | |
1314 | * has completely drained; this is especially | |
1315 | * important if there is a transmit FIFO! | |
1316 | */ | |
1317 | uart_wait_until_sent(tty, port->timeout); | |
1318 | } | |
1319 | ||
1320 | uart_shutdown(state); | |
1321 | uart_flush_buffer(tty); | |
1322 | ||
a46c9994 AC |
1323 | tty_ldisc_flush(tty); |
1324 | ||
1da177e4 | 1325 | tty->closing = 0; |
f751928e | 1326 | state->info.port.tty = NULL; |
1da177e4 | 1327 | |
f751928e | 1328 | if (state->info.port.blocked_open) { |
1da177e4 LT |
1329 | if (state->close_delay) |
1330 | msleep_interruptible(state->close_delay); | |
1331 | } else if (!uart_console(port)) { | |
1332 | uart_change_pm(state, 3); | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * Wake up anyone trying to open this port. | |
1337 | */ | |
f751928e AC |
1338 | state->info.flags &= ~UIF_NORMAL_ACTIVE; |
1339 | wake_up_interruptible(&state->info.port.open_wait); | |
1da177e4 LT |
1340 | |
1341 | done: | |
e2862f6a | 1342 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1343 | } |
1344 | ||
1345 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) | |
1346 | { | |
1347 | struct uart_state *state = tty->driver_data; | |
1348 | struct uart_port *port = state->port; | |
1349 | unsigned long char_time, expire; | |
1350 | ||
1da177e4 LT |
1351 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1352 | return; | |
1353 | ||
f34d7a5b AC |
1354 | lock_kernel(); |
1355 | ||
1da177e4 LT |
1356 | /* |
1357 | * Set the check interval to be 1/5 of the estimated time to | |
1358 | * send a single character, and make it at least 1. The check | |
1359 | * interval should also be less than the timeout. | |
1360 | * | |
1361 | * Note: we have to use pretty tight timings here to satisfy | |
1362 | * the NIST-PCTS. | |
1363 | */ | |
1364 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1365 | char_time = char_time / 5; | |
1366 | if (char_time == 0) | |
1367 | char_time = 1; | |
1368 | if (timeout && timeout < char_time) | |
1369 | char_time = timeout; | |
1370 | ||
1371 | /* | |
1372 | * If the transmitter hasn't cleared in twice the approximate | |
1373 | * amount of time to send the entire FIFO, it probably won't | |
1374 | * ever clear. This assumes the UART isn't doing flow | |
1375 | * control, which is currently the case. Hence, if it ever | |
1376 | * takes longer than port->timeout, this is probably due to a | |
1377 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1378 | * 2*port->timeout. | |
1379 | */ | |
1380 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1381 | timeout = 2 * port->timeout; | |
1382 | ||
1383 | expire = jiffies + timeout; | |
1384 | ||
eb3a1e11 | 1385 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1386 | port->line, jiffies, expire); |
1da177e4 LT |
1387 | |
1388 | /* | |
1389 | * Check whether the transmitter is empty every 'char_time'. | |
1390 | * 'timeout' / 'expire' give us the maximum amount of time | |
1391 | * we wait. | |
1392 | */ | |
1393 | while (!port->ops->tx_empty(port)) { | |
1394 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1395 | if (signal_pending(current)) | |
1396 | break; | |
1397 | if (time_after(jiffies, expire)) | |
1398 | break; | |
1399 | } | |
1400 | set_current_state(TASK_RUNNING); /* might not be needed */ | |
f34d7a5b | 1401 | unlock_kernel(); |
1da177e4 LT |
1402 | } |
1403 | ||
1404 | /* | |
1405 | * This is called with the BKL held in | |
1406 | * linux/drivers/char/tty_io.c:do_tty_hangup() | |
1407 | * We're called from the eventd thread, so we can sleep for | |
1408 | * a _short_ time only. | |
1409 | */ | |
1410 | static void uart_hangup(struct tty_struct *tty) | |
1411 | { | |
1412 | struct uart_state *state = tty->driver_data; | |
f751928e | 1413 | struct uart_info *info = &state->info; |
1da177e4 LT |
1414 | |
1415 | BUG_ON(!kernel_locked()); | |
eb3a1e11 | 1416 | pr_debug("uart_hangup(%d)\n", state->port->line); |
1da177e4 | 1417 | |
e2862f6a | 1418 | mutex_lock(&state->mutex); |
f751928e | 1419 | if (info->flags & UIF_NORMAL_ACTIVE) { |
1da177e4 LT |
1420 | uart_flush_buffer(tty); |
1421 | uart_shutdown(state); | |
1422 | state->count = 0; | |
f751928e AC |
1423 | info->flags &= ~UIF_NORMAL_ACTIVE; |
1424 | info->port.tty = NULL; | |
1425 | wake_up_interruptible(&info->port.open_wait); | |
1426 | wake_up_interruptible(&info->delta_msr_wait); | |
1da177e4 | 1427 | } |
e2862f6a | 1428 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1429 | } |
1430 | ||
1431 | /* | |
1432 | * Copy across the serial console cflag setting into the termios settings | |
1433 | * for the initial open of the port. This allows continuity between the | |
1434 | * kernel settings, and the settings init adopts when it opens the port | |
1435 | * for the first time. | |
1436 | */ | |
1437 | static void uart_update_termios(struct uart_state *state) | |
1438 | { | |
f751928e | 1439 | struct tty_struct *tty = state->info.port.tty; |
1da177e4 LT |
1440 | struct uart_port *port = state->port; |
1441 | ||
1442 | if (uart_console(port) && port->cons->cflag) { | |
1443 | tty->termios->c_cflag = port->cons->cflag; | |
1444 | port->cons->cflag = 0; | |
1445 | } | |
1446 | ||
1447 | /* | |
1448 | * If the device failed to grab its irq resources, | |
1449 | * or some other error occurred, don't try to talk | |
1450 | * to the port hardware. | |
1451 | */ | |
1452 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { | |
1453 | /* | |
1454 | * Make termios settings take effect. | |
1455 | */ | |
1456 | uart_change_speed(state, NULL); | |
1457 | ||
1458 | /* | |
1459 | * And finally enable the RTS and DTR signals. | |
1460 | */ | |
1461 | if (tty->termios->c_cflag & CBAUD) | |
1462 | uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | /* | |
1467 | * Block the open until the port is ready. We must be called with | |
1468 | * the per-port semaphore held. | |
1469 | */ | |
1470 | static int | |
1471 | uart_block_til_ready(struct file *filp, struct uart_state *state) | |
1472 | { | |
1473 | DECLARE_WAITQUEUE(wait, current); | |
f751928e | 1474 | struct uart_info *info = &state->info; |
1da177e4 | 1475 | struct uart_port *port = state->port; |
c5f4644e | 1476 | unsigned int mctrl; |
1da177e4 | 1477 | |
df4f4dd4 | 1478 | info->port.blocked_open++; |
1da177e4 LT |
1479 | state->count--; |
1480 | ||
df4f4dd4 | 1481 | add_wait_queue(&info->port.open_wait, &wait); |
1da177e4 LT |
1482 | while (1) { |
1483 | set_current_state(TASK_INTERRUPTIBLE); | |
1484 | ||
1485 | /* | |
1486 | * If we have been hung up, tell userspace/restart open. | |
1487 | */ | |
df4f4dd4 | 1488 | if (tty_hung_up_p(filp) || info->port.tty == NULL) |
1da177e4 LT |
1489 | break; |
1490 | ||
1491 | /* | |
1492 | * If the port has been closed, tell userspace/restart open. | |
1493 | */ | |
1494 | if (!(info->flags & UIF_INITIALIZED)) | |
1495 | break; | |
1496 | ||
1497 | /* | |
1498 | * If non-blocking mode is set, or CLOCAL mode is set, | |
1499 | * we don't want to wait for the modem status lines to | |
1500 | * indicate that the port is ready. | |
1501 | * | |
1502 | * Also, if the port is not enabled/configured, we want | |
1503 | * to allow the open to succeed here. Note that we will | |
1504 | * have set TTY_IO_ERROR for a non-existant port. | |
1505 | */ | |
1506 | if ((filp->f_flags & O_NONBLOCK) || | |
df4f4dd4 AC |
1507 | (info->port.tty->termios->c_cflag & CLOCAL) || |
1508 | (info->port.tty->flags & (1 << TTY_IO_ERROR))) | |
1da177e4 | 1509 | break; |
1da177e4 LT |
1510 | |
1511 | /* | |
1512 | * Set DTR to allow modem to know we're waiting. Do | |
1513 | * not set RTS here - we want to make sure we catch | |
1514 | * the data from the modem. | |
1515 | */ | |
df4f4dd4 | 1516 | if (info->port.tty->termios->c_cflag & CBAUD) |
1da177e4 LT |
1517 | uart_set_mctrl(port, TIOCM_DTR); |
1518 | ||
1519 | /* | |
1520 | * and wait for the carrier to indicate that the | |
1521 | * modem is ready for us. | |
1522 | */ | |
c5f4644e | 1523 | spin_lock_irq(&port->lock); |
f61051cd | 1524 | port->ops->enable_ms(port); |
c5f4644e RK |
1525 | mctrl = port->ops->get_mctrl(port); |
1526 | spin_unlock_irq(&port->lock); | |
1527 | if (mctrl & TIOCM_CAR) | |
1da177e4 LT |
1528 | break; |
1529 | ||
e2862f6a | 1530 | mutex_unlock(&state->mutex); |
1da177e4 | 1531 | schedule(); |
e2862f6a | 1532 | mutex_lock(&state->mutex); |
1da177e4 LT |
1533 | |
1534 | if (signal_pending(current)) | |
1535 | break; | |
1536 | } | |
1537 | set_current_state(TASK_RUNNING); | |
df4f4dd4 | 1538 | remove_wait_queue(&info->port.open_wait, &wait); |
1da177e4 LT |
1539 | |
1540 | state->count++; | |
df4f4dd4 | 1541 | info->port.blocked_open--; |
1da177e4 LT |
1542 | |
1543 | if (signal_pending(current)) | |
1544 | return -ERESTARTSYS; | |
1545 | ||
df4f4dd4 | 1546 | if (!info->port.tty || tty_hung_up_p(filp)) |
1da177e4 LT |
1547 | return -EAGAIN; |
1548 | ||
1549 | return 0; | |
1550 | } | |
1551 | ||
1552 | static struct uart_state *uart_get(struct uart_driver *drv, int line) | |
1553 | { | |
1554 | struct uart_state *state; | |
68ac64cd | 1555 | int ret = 0; |
1da177e4 | 1556 | |
1da177e4 | 1557 | state = drv->state + line; |
e2862f6a | 1558 | if (mutex_lock_interruptible(&state->mutex)) { |
68ac64cd RK |
1559 | ret = -ERESTARTSYS; |
1560 | goto err; | |
1da177e4 LT |
1561 | } |
1562 | ||
1563 | state->count++; | |
68ac64cd RK |
1564 | if (!state->port || state->port->flags & UPF_DEAD) { |
1565 | ret = -ENXIO; | |
1566 | goto err_unlock; | |
1da177e4 | 1567 | } |
1da177e4 | 1568 | return state; |
68ac64cd RK |
1569 | |
1570 | err_unlock: | |
1571 | state->count--; | |
1572 | mutex_unlock(&state->mutex); | |
1573 | err: | |
1574 | return ERR_PTR(ret); | |
1da177e4 LT |
1575 | } |
1576 | ||
1577 | /* | |
922f9cfa DC |
1578 | * calls to uart_open are serialised by the BKL in |
1579 | * fs/char_dev.c:chrdev_open() | |
1da177e4 LT |
1580 | * Note that if this fails, then uart_close() _will_ be called. |
1581 | * | |
1582 | * In time, we want to scrap the "opening nonpresent ports" | |
1583 | * behaviour and implement an alternative way for setserial | |
1584 | * to set base addresses/ports/types. This will allow us to | |
1585 | * get rid of a certain amount of extra tests. | |
1586 | */ | |
1587 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1588 | { | |
1589 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1590 | struct uart_state *state; | |
1591 | int retval, line = tty->index; | |
1592 | ||
1593 | BUG_ON(!kernel_locked()); | |
eb3a1e11 | 1594 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 LT |
1595 | |
1596 | /* | |
1597 | * tty->driver->num won't change, so we won't fail here with | |
1598 | * tty->driver_data set to something non-NULL (and therefore | |
1599 | * we won't get caught by uart_close()). | |
1600 | */ | |
1601 | retval = -ENODEV; | |
1602 | if (line >= tty->driver->num) | |
1603 | goto fail; | |
1604 | ||
1605 | /* | |
1606 | * We take the semaphore inside uart_get to guarantee that we won't | |
1607 | * be re-entered while allocating the info structure, or while we | |
1608 | * request any IRQs that the driver may need. This also has the nice | |
1609 | * side-effect that it delays the action of uart_hangup, so we can | |
df4f4dd4 | 1610 | * guarantee that info->port.tty will always contain something reasonable. |
1da177e4 LT |
1611 | */ |
1612 | state = uart_get(drv, line); | |
1613 | if (IS_ERR(state)) { | |
1614 | retval = PTR_ERR(state); | |
1615 | goto fail; | |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | * Once we set tty->driver_data here, we are guaranteed that | |
1620 | * uart_close() will decrement the driver module use count. | |
1621 | * Any failures from here onwards should not touch the count. | |
1622 | */ | |
1623 | tty->driver_data = state; | |
f751928e | 1624 | state->port->info = &state->info; |
1da177e4 LT |
1625 | tty->low_latency = (state->port->flags & UPF_LOW_LATENCY) ? 1 : 0; |
1626 | tty->alt_speed = 0; | |
f751928e | 1627 | state->info.port.tty = tty; |
1da177e4 LT |
1628 | |
1629 | /* | |
1630 | * If the port is in the middle of closing, bail out now. | |
1631 | */ | |
1632 | if (tty_hung_up_p(filp)) { | |
1633 | retval = -EAGAIN; | |
1634 | state->count--; | |
e2862f6a | 1635 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1636 | goto fail; |
1637 | } | |
1638 | ||
1639 | /* | |
1640 | * Make sure the device is in D0 state. | |
1641 | */ | |
1642 | if (state->count == 1) | |
1643 | uart_change_pm(state, 0); | |
1644 | ||
1645 | /* | |
1646 | * Start up the serial port. | |
1647 | */ | |
1648 | retval = uart_startup(state, 0); | |
1649 | ||
1650 | /* | |
1651 | * If we succeeded, wait until the port is ready. | |
1652 | */ | |
1653 | if (retval == 0) | |
1654 | retval = uart_block_til_ready(filp, state); | |
e2862f6a | 1655 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1656 | |
1657 | /* | |
1658 | * If this is the first open to succeed, adjust things to suit. | |
1659 | */ | |
f751928e AC |
1660 | if (retval == 0 && !(state->info.flags & UIF_NORMAL_ACTIVE)) { |
1661 | state->info.flags |= UIF_NORMAL_ACTIVE; | |
1da177e4 LT |
1662 | |
1663 | uart_update_termios(state); | |
1664 | } | |
1665 | ||
1666 | fail: | |
1667 | return retval; | |
1668 | } | |
1669 | ||
1670 | static const char *uart_type(struct uart_port *port) | |
1671 | { | |
1672 | const char *str = NULL; | |
1673 | ||
1674 | if (port->ops->type) | |
1675 | str = port->ops->type(port); | |
1676 | ||
1677 | if (!str) | |
1678 | str = "unknown"; | |
1679 | ||
1680 | return str; | |
1681 | } | |
1682 | ||
1683 | #ifdef CONFIG_PROC_FS | |
1684 | ||
1685 | static int uart_line_info(char *buf, struct uart_driver *drv, int i) | |
1686 | { | |
1687 | struct uart_state *state = drv->state + i; | |
3689a0ec | 1688 | int pm_state; |
1da177e4 LT |
1689 | struct uart_port *port = state->port; |
1690 | char stat_buf[32]; | |
1691 | unsigned int status; | |
6c6a2334 | 1692 | int mmio, ret; |
1da177e4 LT |
1693 | |
1694 | if (!port) | |
1695 | return 0; | |
1696 | ||
6c6a2334 | 1697 | mmio = port->iotype >= UPIO_MEM; |
4f640efb | 1698 | ret = sprintf(buf, "%d: uart:%s %s%08llX irq:%d", |
1da177e4 | 1699 | port->line, uart_type(port), |
6c6a2334 | 1700 | mmio ? "mmio:0x" : "port:", |
4f640efb | 1701 | mmio ? (unsigned long long)port->mapbase |
a46c9994 | 1702 | : (unsigned long long) port->iobase, |
1da177e4 LT |
1703 | port->irq); |
1704 | ||
1705 | if (port->type == PORT_UNKNOWN) { | |
1706 | strcat(buf, "\n"); | |
1707 | return ret + 1; | |
1708 | } | |
1709 | ||
a46c9994 | 1710 | if (capable(CAP_SYS_ADMIN)) { |
3689a0ec GD |
1711 | mutex_lock(&state->mutex); |
1712 | pm_state = state->pm_state; | |
1713 | if (pm_state) | |
1714 | uart_change_pm(state, 0); | |
c5f4644e | 1715 | spin_lock_irq(&port->lock); |
1da177e4 | 1716 | status = port->ops->get_mctrl(port); |
c5f4644e | 1717 | spin_unlock_irq(&port->lock); |
3689a0ec GD |
1718 | if (pm_state) |
1719 | uart_change_pm(state, pm_state); | |
1720 | mutex_unlock(&state->mutex); | |
1da177e4 LT |
1721 | |
1722 | ret += sprintf(buf + ret, " tx:%d rx:%d", | |
1723 | port->icount.tx, port->icount.rx); | |
1724 | if (port->icount.frame) | |
1725 | ret += sprintf(buf + ret, " fe:%d", | |
1726 | port->icount.frame); | |
1727 | if (port->icount.parity) | |
1728 | ret += sprintf(buf + ret, " pe:%d", | |
1729 | port->icount.parity); | |
1730 | if (port->icount.brk) | |
1731 | ret += sprintf(buf + ret, " brk:%d", | |
1732 | port->icount.brk); | |
1733 | if (port->icount.overrun) | |
1734 | ret += sprintf(buf + ret, " oe:%d", | |
1735 | port->icount.overrun); | |
a46c9994 AC |
1736 | |
1737 | #define INFOBIT(bit, str) \ | |
1da177e4 LT |
1738 | if (port->mctrl & (bit)) \ |
1739 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1740 | strlen(stat_buf) - 2) | |
a46c9994 | 1741 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1742 | if (status & (bit)) \ |
1743 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1744 | strlen(stat_buf) - 2) | |
1745 | ||
1746 | stat_buf[0] = '\0'; | |
1747 | stat_buf[1] = '\0'; | |
1748 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1749 | STATBIT(TIOCM_CTS, "|CTS"); | |
1750 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1751 | STATBIT(TIOCM_DSR, "|DSR"); | |
1752 | STATBIT(TIOCM_CAR, "|CD"); | |
1753 | STATBIT(TIOCM_RNG, "|RI"); | |
1754 | if (stat_buf[0]) | |
1755 | stat_buf[0] = ' '; | |
1756 | strcat(stat_buf, "\n"); | |
a46c9994 | 1757 | |
1da177e4 LT |
1758 | ret += sprintf(buf + ret, stat_buf); |
1759 | } else { | |
1760 | strcat(buf, "\n"); | |
1761 | ret++; | |
1762 | } | |
1763 | #undef STATBIT | |
1764 | #undef INFOBIT | |
1765 | return ret; | |
1766 | } | |
1767 | ||
1768 | static int uart_read_proc(char *page, char **start, off_t off, | |
1769 | int count, int *eof, void *data) | |
1770 | { | |
1771 | struct tty_driver *ttydrv = data; | |
1772 | struct uart_driver *drv = ttydrv->driver_state; | |
1773 | int i, len = 0, l; | |
1774 | off_t begin = 0; | |
1775 | ||
1776 | len += sprintf(page, "serinfo:1.0 driver%s%s revision:%s\n", | |
1777 | "", "", ""); | |
1778 | for (i = 0; i < drv->nr && len < PAGE_SIZE - 96; i++) { | |
1779 | l = uart_line_info(page + len, drv, i); | |
1780 | len += l; | |
1781 | if (len + begin > off + count) | |
1782 | goto done; | |
1783 | if (len + begin < off) { | |
1784 | begin += len; | |
1785 | len = 0; | |
1786 | } | |
1787 | } | |
1788 | *eof = 1; | |
1789 | done: | |
1790 | if (off >= len + begin) | |
1791 | return 0; | |
1792 | *start = page + (off - begin); | |
1793 | return (count < begin + len - off) ? count : (begin + len - off); | |
1794 | } | |
1795 | #endif | |
1796 | ||
4a1b5502 | 1797 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1798 | /* |
1799 | * uart_console_write - write a console message to a serial port | |
1800 | * @port: the port to write the message | |
1801 | * @s: array of characters | |
1802 | * @count: number of characters in string to write | |
1803 | * @write: function to write character to port | |
1804 | */ | |
1805 | void uart_console_write(struct uart_port *port, const char *s, | |
1806 | unsigned int count, | |
1807 | void (*putchar)(struct uart_port *, int)) | |
1808 | { | |
1809 | unsigned int i; | |
1810 | ||
1811 | for (i = 0; i < count; i++, s++) { | |
1812 | if (*s == '\n') | |
1813 | putchar(port, '\r'); | |
1814 | putchar(port, *s); | |
1815 | } | |
1816 | } | |
1817 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1818 | ||
1da177e4 LT |
1819 | /* |
1820 | * Check whether an invalid uart number has been specified, and | |
1821 | * if so, search for the first available port that does have | |
1822 | * console support. | |
1823 | */ | |
1824 | struct uart_port * __init | |
1825 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1826 | { | |
1827 | int idx = co->index; | |
1828 | ||
1829 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1830 | ports[idx].membase == NULL)) | |
1831 | for (idx = 0; idx < nr; idx++) | |
1832 | if (ports[idx].iobase != 0 || | |
1833 | ports[idx].membase != NULL) | |
1834 | break; | |
1835 | ||
1836 | co->index = idx; | |
1837 | ||
1838 | return ports + idx; | |
1839 | } | |
1840 | ||
1841 | /** | |
1842 | * uart_parse_options - Parse serial port baud/parity/bits/flow contro. | |
1843 | * @options: pointer to option string | |
1844 | * @baud: pointer to an 'int' variable for the baud rate. | |
1845 | * @parity: pointer to an 'int' variable for the parity. | |
1846 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1847 | * @flow: pointer to an 'int' variable for the flow control character. | |
1848 | * | |
1849 | * uart_parse_options decodes a string containing the serial console | |
1850 | * options. The format of the string is <baud><parity><bits><flow>, | |
1851 | * eg: 115200n8r | |
1852 | */ | |
f2d937f3 | 1853 | void |
1da177e4 LT |
1854 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1855 | { | |
1856 | char *s = options; | |
1857 | ||
1858 | *baud = simple_strtoul(s, NULL, 10); | |
1859 | while (*s >= '0' && *s <= '9') | |
1860 | s++; | |
1861 | if (*s) | |
1862 | *parity = *s++; | |
1863 | if (*s) | |
1864 | *bits = *s++ - '0'; | |
1865 | if (*s) | |
1866 | *flow = *s; | |
1867 | } | |
f2d937f3 | 1868 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1869 | |
1870 | struct baud_rates { | |
1871 | unsigned int rate; | |
1872 | unsigned int cflag; | |
1873 | }; | |
1874 | ||
cb3592be | 1875 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1876 | { 921600, B921600 }, |
1877 | { 460800, B460800 }, | |
1878 | { 230400, B230400 }, | |
1879 | { 115200, B115200 }, | |
1880 | { 57600, B57600 }, | |
1881 | { 38400, B38400 }, | |
1882 | { 19200, B19200 }, | |
1883 | { 9600, B9600 }, | |
1884 | { 4800, B4800 }, | |
1885 | { 2400, B2400 }, | |
1886 | { 1200, B1200 }, | |
1887 | { 0, B38400 } | |
1888 | }; | |
1889 | ||
1890 | /** | |
1891 | * uart_set_options - setup the serial console parameters | |
1892 | * @port: pointer to the serial ports uart_port structure | |
1893 | * @co: console pointer | |
1894 | * @baud: baud rate | |
1895 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1896 | * @bits: number of data bits | |
1897 | * @flow: flow control character - 'r' (rts) | |
1898 | */ | |
f2d937f3 | 1899 | int |
1da177e4 LT |
1900 | uart_set_options(struct uart_port *port, struct console *co, |
1901 | int baud, int parity, int bits, int flow) | |
1902 | { | |
606d099c | 1903 | struct ktermios termios; |
149b36ea | 1904 | static struct ktermios dummy; |
1da177e4 LT |
1905 | int i; |
1906 | ||
976ecd12 RK |
1907 | /* |
1908 | * Ensure that the serial console lock is initialised | |
1909 | * early. | |
1910 | */ | |
1911 | spin_lock_init(&port->lock); | |
13e83599 | 1912 | lockdep_set_class(&port->lock, &port_lock_key); |
976ecd12 | 1913 | |
606d099c | 1914 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1915 | |
1916 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1917 | ||
1918 | /* | |
1919 | * Construct a cflag setting. | |
1920 | */ | |
1921 | for (i = 0; baud_rates[i].rate; i++) | |
1922 | if (baud_rates[i].rate <= baud) | |
1923 | break; | |
1924 | ||
1925 | termios.c_cflag |= baud_rates[i].cflag; | |
1926 | ||
1927 | if (bits == 7) | |
1928 | termios.c_cflag |= CS7; | |
1929 | else | |
1930 | termios.c_cflag |= CS8; | |
1931 | ||
1932 | switch (parity) { | |
1933 | case 'o': case 'O': | |
1934 | termios.c_cflag |= PARODD; | |
1935 | /*fall through*/ | |
1936 | case 'e': case 'E': | |
1937 | termios.c_cflag |= PARENB; | |
1938 | break; | |
1939 | } | |
1940 | ||
1941 | if (flow == 'r') | |
1942 | termios.c_cflag |= CRTSCTS; | |
1943 | ||
79492689 YL |
1944 | /* |
1945 | * some uarts on other side don't support no flow control. | |
1946 | * So we set * DTR in host uart to make them happy | |
1947 | */ | |
1948 | port->mctrl |= TIOCM_DTR; | |
1949 | ||
149b36ea | 1950 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1951 | /* |
1952 | * Allow the setting of the UART parameters with a NULL console | |
1953 | * too: | |
1954 | */ | |
1955 | if (co) | |
1956 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1957 | |
1958 | return 0; | |
1959 | } | |
f2d937f3 | 1960 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1961 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1962 | ||
1963 | static void uart_change_pm(struct uart_state *state, int pm_state) | |
1964 | { | |
1965 | struct uart_port *port = state->port; | |
1281e360 AV |
1966 | |
1967 | if (state->pm_state != pm_state) { | |
1968 | if (port->ops->pm) | |
1969 | port->ops->pm(port, pm_state, state->pm_state); | |
1970 | state->pm_state = pm_state; | |
1971 | } | |
1da177e4 LT |
1972 | } |
1973 | ||
b3b708fa GL |
1974 | struct uart_match { |
1975 | struct uart_port *port; | |
1976 | struct uart_driver *driver; | |
1977 | }; | |
1978 | ||
1979 | static int serial_match_port(struct device *dev, void *data) | |
1980 | { | |
1981 | struct uart_match *match = data; | |
7ca796f4 GL |
1982 | struct tty_driver *tty_drv = match->driver->tty_driver; |
1983 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
1984 | match->port->line; | |
b3b708fa GL |
1985 | |
1986 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1987 | } | |
1988 | ||
1da177e4 LT |
1989 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *port) |
1990 | { | |
1991 | struct uart_state *state = drv->state + port->line; | |
b3b708fa GL |
1992 | struct device *tty_dev; |
1993 | struct uart_match match = {port, drv}; | |
1da177e4 | 1994 | |
e2862f6a | 1995 | mutex_lock(&state->mutex); |
1da177e4 | 1996 | |
8f4ce8c3 AS |
1997 | if (!console_suspend_enabled && uart_console(port)) { |
1998 | /* we're going to avoid suspending serial console */ | |
e1da95ae RW |
1999 | mutex_unlock(&state->mutex); |
2000 | return 0; | |
2001 | } | |
e1da95ae | 2002 | |
b3b708fa GL |
2003 | tty_dev = device_find_child(port->dev, &match, serial_match_port); |
2004 | if (device_may_wakeup(tty_dev)) { | |
2005 | enable_irq_wake(port->irq); | |
2006 | put_device(tty_dev); | |
2007 | mutex_unlock(&state->mutex); | |
2008 | return 0; | |
2009 | } | |
2010 | port->suspended = 1; | |
2011 | ||
f751928e | 2012 | if (state->info.flags & UIF_INITIALIZED) { |
ba899dbc | 2013 | const struct uart_ops *ops = port->ops; |
c8c6bfa3 | 2014 | int tries; |
1da177e4 | 2015 | |
f751928e | 2016 | state->info.flags = (state->info.flags & ~UIF_INITIALIZED) |
a6b93a90 RK |
2017 | | UIF_SUSPENDED; |
2018 | ||
1da177e4 | 2019 | spin_lock_irq(&port->lock); |
b129a8cc | 2020 | ops->stop_tx(port); |
1da177e4 LT |
2021 | ops->set_mctrl(port, 0); |
2022 | ops->stop_rx(port); | |
2023 | spin_unlock_irq(&port->lock); | |
2024 | ||
2025 | /* | |
2026 | * Wait for the transmitter to empty. | |
2027 | */ | |
a46c9994 | 2028 | for (tries = 3; !ops->tx_empty(port) && tries; tries--) |
1da177e4 | 2029 | msleep(10); |
c8c6bfa3 | 2030 | if (!tries) |
a46c9994 AC |
2031 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
2032 | "transmitter\n", | |
4bfe090b | 2033 | port->dev ? dev_name(port->dev) : "", |
c8c6bfa3 | 2034 | port->dev ? ": " : "", |
8440838b DM |
2035 | drv->dev_name, |
2036 | drv->tty_driver->name_base + port->line); | |
1da177e4 LT |
2037 | |
2038 | ops->shutdown(port); | |
2039 | } | |
2040 | ||
2041 | /* | |
2042 | * Disable the console device before suspending. | |
2043 | */ | |
2044 | if (uart_console(port)) | |
2045 | console_stop(port->cons); | |
2046 | ||
2047 | uart_change_pm(state, 3); | |
2048 | ||
e2862f6a | 2049 | mutex_unlock(&state->mutex); |
1da177e4 LT |
2050 | |
2051 | return 0; | |
2052 | } | |
2053 | ||
2054 | int uart_resume_port(struct uart_driver *drv, struct uart_port *port) | |
2055 | { | |
2056 | struct uart_state *state = drv->state + port->line; | |
03a74dcc AV |
2057 | struct device *tty_dev; |
2058 | struct uart_match match = {port, drv}; | |
1da177e4 | 2059 | |
e2862f6a | 2060 | mutex_lock(&state->mutex); |
1da177e4 | 2061 | |
8f4ce8c3 AS |
2062 | if (!console_suspend_enabled && uart_console(port)) { |
2063 | /* no need to resume serial console, it wasn't suspended */ | |
e1da95ae RW |
2064 | mutex_unlock(&state->mutex); |
2065 | return 0; | |
2066 | } | |
e1da95ae | 2067 | |
03a74dcc AV |
2068 | tty_dev = device_find_child(port->dev, &match, serial_match_port); |
2069 | if (!port->suspended && device_may_wakeup(tty_dev)) { | |
b3b708fa GL |
2070 | disable_irq_wake(port->irq); |
2071 | mutex_unlock(&state->mutex); | |
2072 | return 0; | |
2073 | } | |
2074 | port->suspended = 0; | |
2075 | ||
1da177e4 LT |
2076 | /* |
2077 | * Re-enable the console device after suspending. | |
2078 | */ | |
2079 | if (uart_console(port)) { | |
606d099c | 2080 | struct ktermios termios; |
1da177e4 LT |
2081 | |
2082 | /* | |
2083 | * First try to use the console cflag setting. | |
2084 | */ | |
606d099c | 2085 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
2086 | termios.c_cflag = port->cons->cflag; |
2087 | ||
2088 | /* | |
2089 | * If that's unset, use the tty termios setting. | |
2090 | */ | |
f751928e AC |
2091 | if (state->info.port.tty && termios.c_cflag == 0) |
2092 | termios = *state->info.port.tty->termios; | |
1da177e4 | 2093 | |
9d778a69 | 2094 | uart_change_pm(state, 0); |
1da177e4 LT |
2095 | port->ops->set_termios(port, &termios, NULL); |
2096 | console_start(port->cons); | |
2097 | } | |
2098 | ||
f751928e | 2099 | if (state->info.flags & UIF_SUSPENDED) { |
ba899dbc | 2100 | const struct uart_ops *ops = port->ops; |
ee31b337 | 2101 | int ret; |
1da177e4 | 2102 | |
9d778a69 | 2103 | uart_change_pm(state, 0); |
f34d7a5b | 2104 | spin_lock_irq(&port->lock); |
1da177e4 | 2105 | ops->set_mctrl(port, 0); |
f34d7a5b | 2106 | spin_unlock_irq(&port->lock); |
ee31b337 RK |
2107 | ret = ops->startup(port); |
2108 | if (ret == 0) { | |
2109 | uart_change_speed(state, NULL); | |
2110 | spin_lock_irq(&port->lock); | |
2111 | ops->set_mctrl(port, port->mctrl); | |
2112 | ops->start_tx(port); | |
2113 | spin_unlock_irq(&port->lock); | |
f751928e | 2114 | state->info.flags |= UIF_INITIALIZED; |
ee31b337 RK |
2115 | } else { |
2116 | /* | |
2117 | * Failed to resume - maybe hardware went away? | |
2118 | * Clear the "initialized" flag so we won't try | |
2119 | * to call the low level drivers shutdown method. | |
2120 | */ | |
ee31b337 RK |
2121 | uart_shutdown(state); |
2122 | } | |
a6b93a90 | 2123 | |
f751928e | 2124 | state->info.flags &= ~UIF_SUSPENDED; |
1da177e4 LT |
2125 | } |
2126 | ||
e2862f6a | 2127 | mutex_unlock(&state->mutex); |
1da177e4 LT |
2128 | |
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | static inline void | |
2133 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2134 | { | |
30b7a3bc RK |
2135 | char address[64]; |
2136 | ||
1da177e4 LT |
2137 | switch (port->iotype) { |
2138 | case UPIO_PORT: | |
9bde10a4 | 2139 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2140 | break; |
2141 | case UPIO_HUB6: | |
30b7a3bc | 2142 | snprintf(address, sizeof(address), |
9bde10a4 | 2143 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2144 | break; |
2145 | case UPIO_MEM: | |
2146 | case UPIO_MEM32: | |
21c614a7 | 2147 | case UPIO_AU: |
3be91ec7 | 2148 | case UPIO_TSI: |
beab697a | 2149 | case UPIO_DWAPB: |
30b7a3bc | 2150 | snprintf(address, sizeof(address), |
4f640efb | 2151 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2152 | break; |
2153 | default: | |
2154 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2155 | break; |
2156 | } | |
30b7a3bc | 2157 | |
0cf669d5 | 2158 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", |
4bfe090b | 2159 | port->dev ? dev_name(port->dev) : "", |
0cf669d5 | 2160 | port->dev ? ": " : "", |
8440838b DM |
2161 | drv->dev_name, |
2162 | drv->tty_driver->name_base + port->line, | |
2163 | address, port->irq, uart_type(port)); | |
1da177e4 LT |
2164 | } |
2165 | ||
2166 | static void | |
2167 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2168 | struct uart_port *port) | |
2169 | { | |
2170 | unsigned int flags; | |
2171 | ||
2172 | /* | |
2173 | * If there isn't a port here, don't do anything further. | |
2174 | */ | |
2175 | if (!port->iobase && !port->mapbase && !port->membase) | |
2176 | return; | |
2177 | ||
2178 | /* | |
2179 | * Now do the auto configuration stuff. Note that config_port | |
2180 | * is expected to claim the resources and map the port for us. | |
2181 | */ | |
8e23fcc8 | 2182 | flags = 0; |
1da177e4 LT |
2183 | if (port->flags & UPF_AUTO_IRQ) |
2184 | flags |= UART_CONFIG_IRQ; | |
2185 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2186 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2187 | port->type = PORT_UNKNOWN; | |
2188 | flags |= UART_CONFIG_TYPE; | |
2189 | } | |
1da177e4 LT |
2190 | port->ops->config_port(port, flags); |
2191 | } | |
2192 | ||
2193 | if (port->type != PORT_UNKNOWN) { | |
2194 | unsigned long flags; | |
2195 | ||
2196 | uart_report_port(drv, port); | |
2197 | ||
3689a0ec GD |
2198 | /* Power up port for set_mctrl() */ |
2199 | uart_change_pm(state, 0); | |
2200 | ||
1da177e4 LT |
2201 | /* |
2202 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2203 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2204 | * We probably don't need a spinlock around this, but |
2205 | */ | |
2206 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2207 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2208 | spin_unlock_irqrestore(&port->lock, flags); |
2209 | ||
97d97224 RK |
2210 | /* |
2211 | * If this driver supports console, and it hasn't been | |
2212 | * successfully registered yet, try to re-register it. | |
2213 | * It may be that the port was not available. | |
2214 | */ | |
2215 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2216 | register_console(port->cons); | |
2217 | ||
1da177e4 LT |
2218 | /* |
2219 | * Power down all ports by default, except the | |
2220 | * console if we have one. | |
2221 | */ | |
2222 | if (!uart_console(port)) | |
2223 | uart_change_pm(state, 3); | |
2224 | } | |
2225 | } | |
2226 | ||
f2d937f3 JW |
2227 | #ifdef CONFIG_CONSOLE_POLL |
2228 | ||
2229 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2230 | { | |
2231 | struct uart_driver *drv = driver->driver_state; | |
2232 | struct uart_state *state = drv->state + line; | |
2233 | struct uart_port *port; | |
2234 | int baud = 9600; | |
2235 | int bits = 8; | |
2236 | int parity = 'n'; | |
2237 | int flow = 'n'; | |
2238 | ||
2239 | if (!state || !state->port) | |
2240 | return -1; | |
2241 | ||
2242 | port = state->port; | |
2243 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) | |
2244 | return -1; | |
2245 | ||
2246 | if (options) { | |
2247 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2248 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2249 | } | |
2250 | ||
2251 | return 0; | |
2252 | } | |
2253 | ||
2254 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2255 | { | |
2256 | struct uart_driver *drv = driver->driver_state; | |
2257 | struct uart_state *state = drv->state + line; | |
2258 | struct uart_port *port; | |
2259 | ||
2260 | if (!state || !state->port) | |
2261 | return -1; | |
2262 | ||
2263 | port = state->port; | |
2264 | return port->ops->poll_get_char(port); | |
2265 | } | |
2266 | ||
2267 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2268 | { | |
2269 | struct uart_driver *drv = driver->driver_state; | |
2270 | struct uart_state *state = drv->state + line; | |
2271 | struct uart_port *port; | |
2272 | ||
2273 | if (!state || !state->port) | |
2274 | return; | |
2275 | ||
2276 | port = state->port; | |
2277 | port->ops->poll_put_char(port, ch); | |
2278 | } | |
2279 | #endif | |
2280 | ||
b68e31d0 | 2281 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2282 | .open = uart_open, |
2283 | .close = uart_close, | |
2284 | .write = uart_write, | |
2285 | .put_char = uart_put_char, | |
2286 | .flush_chars = uart_flush_chars, | |
2287 | .write_room = uart_write_room, | |
2288 | .chars_in_buffer= uart_chars_in_buffer, | |
2289 | .flush_buffer = uart_flush_buffer, | |
2290 | .ioctl = uart_ioctl, | |
2291 | .throttle = uart_throttle, | |
2292 | .unthrottle = uart_unthrottle, | |
2293 | .send_xchar = uart_send_xchar, | |
2294 | .set_termios = uart_set_termios, | |
64e9159f | 2295 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2296 | .stop = uart_stop, |
2297 | .start = uart_start, | |
2298 | .hangup = uart_hangup, | |
2299 | .break_ctl = uart_break_ctl, | |
2300 | .wait_until_sent= uart_wait_until_sent, | |
2301 | #ifdef CONFIG_PROC_FS | |
2302 | .read_proc = uart_read_proc, | |
2303 | #endif | |
2304 | .tiocmget = uart_tiocmget, | |
2305 | .tiocmset = uart_tiocmset, | |
f2d937f3 JW |
2306 | #ifdef CONFIG_CONSOLE_POLL |
2307 | .poll_init = uart_poll_init, | |
2308 | .poll_get_char = uart_poll_get_char, | |
2309 | .poll_put_char = uart_poll_put_char, | |
2310 | #endif | |
1da177e4 LT |
2311 | }; |
2312 | ||
2313 | /** | |
2314 | * uart_register_driver - register a driver with the uart core layer | |
2315 | * @drv: low level driver structure | |
2316 | * | |
2317 | * Register a uart driver with the core driver. We in turn register | |
2318 | * with the tty layer, and initialise the core driver per-port state. | |
2319 | * | |
2320 | * We have a proc file in /proc/tty/driver which is named after the | |
2321 | * normal driver. | |
2322 | * | |
2323 | * drv->port should be NULL, and the per-port structures should be | |
2324 | * registered using uart_add_one_port after this call has succeeded. | |
2325 | */ | |
2326 | int uart_register_driver(struct uart_driver *drv) | |
2327 | { | |
2328 | struct tty_driver *normal = NULL; | |
2329 | int i, retval; | |
2330 | ||
2331 | BUG_ON(drv->state); | |
2332 | ||
2333 | /* | |
2334 | * Maybe we should be using a slab cache for this, especially if | |
2335 | * we have a large number of ports to handle. | |
2336 | */ | |
8f31bb39 | 2337 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2338 | retval = -ENOMEM; |
2339 | if (!drv->state) | |
2340 | goto out; | |
2341 | ||
1da177e4 LT |
2342 | normal = alloc_tty_driver(drv->nr); |
2343 | if (!normal) | |
2344 | goto out; | |
2345 | ||
2346 | drv->tty_driver = normal; | |
2347 | ||
2348 | normal->owner = drv->owner; | |
2349 | normal->driver_name = drv->driver_name; | |
1da177e4 LT |
2350 | normal->name = drv->dev_name; |
2351 | normal->major = drv->major; | |
2352 | normal->minor_start = drv->minor; | |
2353 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2354 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2355 | normal->init_termios = tty_std_termios; | |
2356 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2357 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2358 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2359 | normal->driver_state = drv; |
2360 | tty_set_operations(normal, &uart_ops); | |
2361 | ||
2362 | /* | |
2363 | * Initialise the UART state(s). | |
2364 | */ | |
2365 | for (i = 0; i < drv->nr; i++) { | |
2366 | struct uart_state *state = drv->state + i; | |
2367 | ||
2368 | state->close_delay = 500; /* .5 seconds */ | |
2369 | state->closing_wait = 30000; /* 30 seconds */ | |
e2862f6a | 2370 | mutex_init(&state->mutex); |
f751928e AC |
2371 | |
2372 | tty_port_init(&state->info.port); | |
2373 | init_waitqueue_head(&state->info.delta_msr_wait); | |
2374 | tasklet_init(&state->info.tlet, uart_tasklet_action, | |
2375 | (unsigned long)state); | |
1da177e4 LT |
2376 | } |
2377 | ||
2378 | retval = tty_register_driver(normal); | |
2379 | out: | |
2380 | if (retval < 0) { | |
2381 | put_tty_driver(normal); | |
2382 | kfree(drv->state); | |
2383 | } | |
2384 | return retval; | |
2385 | } | |
2386 | ||
2387 | /** | |
2388 | * uart_unregister_driver - remove a driver from the uart core layer | |
2389 | * @drv: low level driver structure | |
2390 | * | |
2391 | * Remove all references to a driver from the core driver. The low | |
2392 | * level driver must have removed all its ports via the | |
2393 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2394 | * (ie, drv->port == NULL) | |
2395 | */ | |
2396 | void uart_unregister_driver(struct uart_driver *drv) | |
2397 | { | |
2398 | struct tty_driver *p = drv->tty_driver; | |
2399 | tty_unregister_driver(p); | |
2400 | put_tty_driver(p); | |
2401 | kfree(drv->state); | |
2402 | drv->tty_driver = NULL; | |
2403 | } | |
2404 | ||
2405 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2406 | { | |
2407 | struct uart_driver *p = co->data; | |
2408 | *index = co->index; | |
2409 | return p->tty_driver; | |
2410 | } | |
2411 | ||
2412 | /** | |
2413 | * uart_add_one_port - attach a driver-defined port structure | |
2414 | * @drv: pointer to the uart low level driver structure for this port | |
2415 | * @port: uart port structure to use for this port. | |
2416 | * | |
2417 | * This allows the driver to register its own uart_port structure | |
2418 | * with the core driver. The main purpose is to allow the low | |
2419 | * level uart drivers to expand uart_port, rather than having yet | |
2420 | * more levels of structures. | |
2421 | */ | |
2422 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *port) | |
2423 | { | |
2424 | struct uart_state *state; | |
2425 | int ret = 0; | |
b3b708fa | 2426 | struct device *tty_dev; |
1da177e4 LT |
2427 | |
2428 | BUG_ON(in_interrupt()); | |
2429 | ||
2430 | if (port->line >= drv->nr) | |
2431 | return -EINVAL; | |
2432 | ||
2433 | state = drv->state + port->line; | |
2434 | ||
f392ecfa | 2435 | mutex_lock(&port_mutex); |
68ac64cd | 2436 | mutex_lock(&state->mutex); |
1da177e4 LT |
2437 | if (state->port) { |
2438 | ret = -EINVAL; | |
2439 | goto out; | |
2440 | } | |
2441 | ||
2442 | state->port = port; | |
97d97224 | 2443 | state->pm_state = -1; |
1da177e4 | 2444 | |
1da177e4 | 2445 | port->cons = drv->cons; |
f751928e | 2446 | port->info = &state->info; |
1da177e4 | 2447 | |
976ecd12 RK |
2448 | /* |
2449 | * If this port is a console, then the spinlock is already | |
2450 | * initialised. | |
2451 | */ | |
13e83599 | 2452 | if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { |
976ecd12 | 2453 | spin_lock_init(&port->lock); |
13e83599 IM |
2454 | lockdep_set_class(&port->lock, &port_lock_key); |
2455 | } | |
976ecd12 | 2456 | |
1da177e4 LT |
2457 | uart_configure_port(drv, state, port); |
2458 | ||
2459 | /* | |
2460 | * Register the port whether it's detected or not. This allows | |
2461 | * setserial to be used to alter this ports parameters. | |
2462 | */ | |
b3b708fa GL |
2463 | tty_dev = tty_register_device(drv->tty_driver, port->line, port->dev); |
2464 | if (likely(!IS_ERR(tty_dev))) { | |
74081f86 | 2465 | device_init_wakeup(tty_dev, 1); |
b3b708fa GL |
2466 | device_set_wakeup_enable(tty_dev, 0); |
2467 | } else | |
2468 | printk(KERN_ERR "Cannot register tty device on line %d\n", | |
2469 | port->line); | |
1da177e4 | 2470 | |
68ac64cd RK |
2471 | /* |
2472 | * Ensure UPF_DEAD is not set. | |
2473 | */ | |
2474 | port->flags &= ~UPF_DEAD; | |
2475 | ||
1da177e4 | 2476 | out: |
68ac64cd | 2477 | mutex_unlock(&state->mutex); |
f392ecfa | 2478 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2479 | |
2480 | return ret; | |
2481 | } | |
2482 | ||
2483 | /** | |
2484 | * uart_remove_one_port - detach a driver defined port structure | |
2485 | * @drv: pointer to the uart low level driver structure for this port | |
2486 | * @port: uart port structure for this port | |
2487 | * | |
2488 | * This unhooks (and hangs up) the specified port structure from the | |
2489 | * core driver. No further calls will be made to the low-level code | |
2490 | * for this port. | |
2491 | */ | |
2492 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *port) | |
2493 | { | |
2494 | struct uart_state *state = drv->state + port->line; | |
68ac64cd | 2495 | struct uart_info *info; |
1da177e4 LT |
2496 | |
2497 | BUG_ON(in_interrupt()); | |
2498 | ||
2499 | if (state->port != port) | |
2500 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", | |
2501 | state->port, port); | |
2502 | ||
f392ecfa | 2503 | mutex_lock(&port_mutex); |
1da177e4 | 2504 | |
68ac64cd RK |
2505 | /* |
2506 | * Mark the port "dead" - this prevents any opens from | |
2507 | * succeeding while we shut down the port. | |
2508 | */ | |
2509 | mutex_lock(&state->mutex); | |
2510 | port->flags |= UPF_DEAD; | |
2511 | mutex_unlock(&state->mutex); | |
2512 | ||
1da177e4 | 2513 | /* |
aa4148cf | 2514 | * Remove the devices from the tty layer |
1da177e4 LT |
2515 | */ |
2516 | tty_unregister_device(drv->tty_driver, port->line); | |
2517 | ||
f751928e | 2518 | info = &state->info; |
df4f4dd4 AC |
2519 | if (info && info->port.tty) |
2520 | tty_vhangup(info->port.tty); | |
68ac64cd | 2521 | |
68ac64cd RK |
2522 | /* |
2523 | * Free the port IO and memory resources, if any. | |
2524 | */ | |
2525 | if (port->type != PORT_UNKNOWN) | |
2526 | port->ops->release_port(port); | |
2527 | ||
2528 | /* | |
2529 | * Indicate that there isn't a port here anymore. | |
2530 | */ | |
2531 | port->type = PORT_UNKNOWN; | |
2532 | ||
2533 | /* | |
2534 | * Kill the tasklet, and free resources. | |
2535 | */ | |
bc325628 | 2536 | if (info) |
68ac64cd | 2537 | tasklet_kill(&info->tlet); |
68ac64cd | 2538 | |
1da177e4 | 2539 | state->port = NULL; |
f392ecfa | 2540 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2541 | |
2542 | return 0; | |
2543 | } | |
2544 | ||
2545 | /* | |
2546 | * Are the two ports equivalent? | |
2547 | */ | |
2548 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2549 | { | |
2550 | if (port1->iotype != port2->iotype) | |
2551 | return 0; | |
2552 | ||
2553 | switch (port1->iotype) { | |
2554 | case UPIO_PORT: | |
2555 | return (port1->iobase == port2->iobase); | |
2556 | case UPIO_HUB6: | |
2557 | return (port1->iobase == port2->iobase) && | |
2558 | (port1->hub6 == port2->hub6); | |
2559 | case UPIO_MEM: | |
d21b55d3 SS |
2560 | case UPIO_MEM32: |
2561 | case UPIO_AU: | |
2562 | case UPIO_TSI: | |
beab697a | 2563 | case UPIO_DWAPB: |
1624f003 | 2564 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2565 | } |
2566 | return 0; | |
2567 | } | |
2568 | EXPORT_SYMBOL(uart_match_port); | |
2569 | ||
1da177e4 LT |
2570 | EXPORT_SYMBOL(uart_write_wakeup); |
2571 | EXPORT_SYMBOL(uart_register_driver); | |
2572 | EXPORT_SYMBOL(uart_unregister_driver); | |
2573 | EXPORT_SYMBOL(uart_suspend_port); | |
2574 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2575 | EXPORT_SYMBOL(uart_add_one_port); |
2576 | EXPORT_SYMBOL(uart_remove_one_port); | |
2577 | ||
2578 | MODULE_DESCRIPTION("Serial driver core"); | |
2579 | MODULE_LICENSE("GPL"); |