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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Driver core for serial ports |
3 | * | |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Copyright 1999 ARM Limited | |
7 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/tty.h> | |
027d7dac | 25 | #include <linux/tty_flip.h> |
1da177e4 LT |
26 | #include <linux/slab.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/console.h> | |
d196a949 AD |
29 | #include <linux/proc_fs.h> |
30 | #include <linux/seq_file.h> | |
1da177e4 LT |
31 | #include <linux/device.h> |
32 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ | |
ccce6deb | 33 | #include <linux/serial_core.h> |
1da177e4 | 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 | ||
1da177e4 LT |
53 | #ifdef CONFIG_SERIAL_CORE_CONSOLE |
54 | #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) | |
55 | #else | |
56 | #define uart_console(port) (0) | |
57 | #endif | |
58 | ||
19225135 | 59 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
a46c9994 | 60 | struct ktermios *old_termios); |
1f33a51d | 61 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
1da177e4 LT |
62 | static void uart_change_pm(struct uart_state *state, int pm_state); |
63 | ||
b922e19d JS |
64 | static void uart_port_shutdown(struct tty_port *port); |
65 | ||
1da177e4 LT |
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 | { | |
ebd2c8f6 | 72 | struct uart_state *state = port->state; |
d5f735e5 PM |
73 | /* |
74 | * This means you called this function _after_ the port was | |
75 | * closed. No cookie for you. | |
76 | */ | |
ebd2c8f6 | 77 | BUG_ON(!state); |
6a3e492b | 78 | tty_wakeup(state->port.tty); |
1da177e4 LT |
79 | } |
80 | ||
81 | static void uart_stop(struct tty_struct *tty) | |
82 | { | |
83 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 84 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
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; | |
ebd2c8f6 | 95 | struct uart_port *port = state->uart_port; |
1da177e4 | 96 | |
ebd2c8f6 | 97 | if (!uart_circ_empty(&state->xmit) && state->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; | |
ebd2c8f6 | 105 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
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 | ||
1da177e4 LT |
113 | static inline void |
114 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) | |
115 | { | |
116 | unsigned long flags; | |
117 | unsigned int old; | |
118 | ||
119 | spin_lock_irqsave(&port->lock, flags); | |
120 | old = port->mctrl; | |
121 | port->mctrl = (old & ~clear) | set; | |
122 | if (old != port->mctrl) | |
123 | port->ops->set_mctrl(port, port->mctrl); | |
124 | spin_unlock_irqrestore(&port->lock, flags); | |
125 | } | |
126 | ||
a46c9994 AC |
127 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
128 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) | |
1da177e4 LT |
129 | |
130 | /* | |
131 | * Startup the port. This will be called once per open. All calls | |
df4f4dd4 | 132 | * will be serialised by the per-port mutex. |
1da177e4 | 133 | */ |
c0d92be6 JS |
134 | static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, |
135 | int init_hw) | |
1da177e4 | 136 | { |
46d57a44 AC |
137 | struct uart_port *uport = state->uart_port; |
138 | struct tty_port *port = &state->port; | |
1da177e4 LT |
139 | unsigned long page; |
140 | int retval = 0; | |
141 | ||
46d57a44 | 142 | if (uport->type == PORT_UNKNOWN) |
c0d92be6 | 143 | return 1; |
1da177e4 LT |
144 | |
145 | /* | |
146 | * Initialise and allocate the transmit and temporary | |
147 | * buffer. | |
148 | */ | |
ebd2c8f6 | 149 | if (!state->xmit.buf) { |
df4f4dd4 | 150 | /* This is protected by the per port mutex */ |
1da177e4 LT |
151 | page = get_zeroed_page(GFP_KERNEL); |
152 | if (!page) | |
153 | return -ENOMEM; | |
154 | ||
ebd2c8f6 AC |
155 | state->xmit.buf = (unsigned char *) page; |
156 | uart_circ_clear(&state->xmit); | |
1da177e4 LT |
157 | } |
158 | ||
46d57a44 | 159 | retval = uport->ops->startup(uport); |
1da177e4 | 160 | if (retval == 0) { |
c7d7abff JS |
161 | if (uart_console(uport) && uport->cons->cflag) { |
162 | tty->termios->c_cflag = uport->cons->cflag; | |
163 | uport->cons->cflag = 0; | |
164 | } | |
165 | /* | |
166 | * Initialise the hardware port settings. | |
167 | */ | |
168 | uart_change_speed(tty, state, NULL); | |
1da177e4 | 169 | |
c7d7abff | 170 | if (init_hw) { |
1da177e4 LT |
171 | /* |
172 | * Setup the RTS and DTR signals once the | |
173 | * port is open and ready to respond. | |
174 | */ | |
19225135 | 175 | if (tty->termios->c_cflag & CBAUD) |
46d57a44 | 176 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 LT |
177 | } |
178 | ||
ccce6deb | 179 | if (port->flags & ASYNC_CTS_FLOW) { |
46d57a44 AC |
180 | spin_lock_irq(&uport->lock); |
181 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) | |
19225135 | 182 | tty->hw_stopped = 1; |
46d57a44 | 183 | spin_unlock_irq(&uport->lock); |
0dd7a1ae | 184 | } |
1da177e4 LT |
185 | } |
186 | ||
0055197e JS |
187 | /* |
188 | * This is to allow setserial on this port. People may want to set | |
189 | * port/irq/type and then reconfigure the port properly if it failed | |
190 | * now. | |
191 | */ | |
1da177e4 | 192 | if (retval && capable(CAP_SYS_ADMIN)) |
c0d92be6 JS |
193 | return 1; |
194 | ||
195 | return retval; | |
196 | } | |
197 | ||
198 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, | |
199 | int init_hw) | |
200 | { | |
201 | struct tty_port *port = &state->port; | |
202 | int retval; | |
203 | ||
204 | if (port->flags & ASYNC_INITIALIZED) | |
205 | return 0; | |
206 | ||
207 | /* | |
208 | * Set the TTY IO error marker - we will only clear this | |
209 | * once we have successfully opened the port. | |
210 | */ | |
211 | set_bit(TTY_IO_ERROR, &tty->flags); | |
212 | ||
213 | retval = uart_port_startup(tty, state, init_hw); | |
214 | if (!retval) { | |
215 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
216 | clear_bit(TTY_IO_ERROR, &tty->flags); | |
217 | } else if (retval > 0) | |
1da177e4 LT |
218 | retval = 0; |
219 | ||
220 | return retval; | |
221 | } | |
222 | ||
223 | /* | |
224 | * This routine will shutdown a serial port; interrupts are disabled, and | |
225 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
226 | * uart_shutdown are serialised by the per-port semaphore. | |
227 | */ | |
19225135 | 228 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
1da177e4 | 229 | { |
ccce6deb | 230 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 231 | struct tty_port *port = &state->port; |
1da177e4 | 232 | |
1da177e4 | 233 | /* |
ee31b337 | 234 | * Set the TTY IO error marker |
1da177e4 | 235 | */ |
f751928e AC |
236 | if (tty) |
237 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 238 | |
bdc04e31 | 239 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
ee31b337 RK |
240 | /* |
241 | * Turn off DTR and RTS early. | |
242 | */ | |
f751928e | 243 | if (!tty || (tty->termios->c_cflag & HUPCL)) |
ccce6deb | 244 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
ee31b337 | 245 | |
b922e19d | 246 | uart_port_shutdown(port); |
ee31b337 | 247 | } |
1da177e4 LT |
248 | |
249 | /* | |
d208a3bf DA |
250 | * It's possible for shutdown to be called after suspend if we get |
251 | * a DCD drop (hangup) at just the right time. Clear suspended bit so | |
252 | * we don't try to resume a port that has been shutdown. | |
1da177e4 | 253 | */ |
d208a3bf | 254 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
255 | |
256 | /* | |
257 | * Free the transmit buffer page. | |
258 | */ | |
ebd2c8f6 AC |
259 | if (state->xmit.buf) { |
260 | free_page((unsigned long)state->xmit.buf); | |
261 | state->xmit.buf = NULL; | |
1da177e4 | 262 | } |
1da177e4 LT |
263 | } |
264 | ||
265 | /** | |
266 | * uart_update_timeout - update per-port FIFO timeout. | |
267 | * @port: uart_port structure describing the port | |
268 | * @cflag: termios cflag value | |
269 | * @baud: speed of the port | |
270 | * | |
271 | * Set the port FIFO timeout value. The @cflag value should | |
272 | * reflect the actual hardware settings. | |
273 | */ | |
274 | void | |
275 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
276 | unsigned int baud) | |
277 | { | |
278 | unsigned int bits; | |
279 | ||
280 | /* byte size and parity */ | |
281 | switch (cflag & CSIZE) { | |
282 | case CS5: | |
283 | bits = 7; | |
284 | break; | |
285 | case CS6: | |
286 | bits = 8; | |
287 | break; | |
288 | case CS7: | |
289 | bits = 9; | |
290 | break; | |
291 | default: | |
292 | bits = 10; | |
a46c9994 | 293 | break; /* CS8 */ |
1da177e4 LT |
294 | } |
295 | ||
296 | if (cflag & CSTOPB) | |
297 | bits++; | |
298 | if (cflag & PARENB) | |
299 | bits++; | |
300 | ||
301 | /* | |
302 | * The total number of bits to be transmitted in the fifo. | |
303 | */ | |
304 | bits = bits * port->fifosize; | |
305 | ||
306 | /* | |
307 | * Figure the timeout to send the above number of bits. | |
308 | * Add .02 seconds of slop | |
309 | */ | |
310 | port->timeout = (HZ * bits) / baud + HZ/50; | |
311 | } | |
312 | ||
313 | EXPORT_SYMBOL(uart_update_timeout); | |
314 | ||
315 | /** | |
316 | * uart_get_baud_rate - return baud rate for a particular port | |
317 | * @port: uart_port structure describing the port in question. | |
318 | * @termios: desired termios settings. | |
319 | * @old: old termios (or NULL) | |
320 | * @min: minimum acceptable baud rate | |
321 | * @max: maximum acceptable baud rate | |
322 | * | |
323 | * Decode the termios structure into a numeric baud rate, | |
324 | * taking account of the magic 38400 baud rate (with spd_* | |
325 | * flags), and mapping the %B0 rate to 9600 baud. | |
326 | * | |
327 | * If the new baud rate is invalid, try the old termios setting. | |
328 | * If it's still invalid, we try 9600 baud. | |
329 | * | |
330 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
331 | * we're actually going to be using. Don't do this for the case |
332 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
333 | */ |
334 | unsigned int | |
606d099c AC |
335 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
336 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
337 | { |
338 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 339 | int hung_up = 0; |
0077d45e | 340 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
341 | |
342 | if (flags == UPF_SPD_HI) | |
343 | altbaud = 57600; | |
82cb7ba1 | 344 | else if (flags == UPF_SPD_VHI) |
1da177e4 | 345 | altbaud = 115200; |
82cb7ba1 | 346 | else if (flags == UPF_SPD_SHI) |
1da177e4 | 347 | altbaud = 230400; |
82cb7ba1 | 348 | else if (flags == UPF_SPD_WARP) |
1da177e4 LT |
349 | altbaud = 460800; |
350 | ||
351 | for (try = 0; try < 2; try++) { | |
352 | baud = tty_termios_baud_rate(termios); | |
353 | ||
354 | /* | |
355 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
356 | * Die! Die! Die! | |
357 | */ | |
358 | if (baud == 38400) | |
359 | baud = altbaud; | |
360 | ||
361 | /* | |
362 | * Special case: B0 rate. | |
363 | */ | |
eb424fd2 AC |
364 | if (baud == 0) { |
365 | hung_up = 1; | |
1da177e4 | 366 | baud = 9600; |
eb424fd2 | 367 | } |
1da177e4 LT |
368 | |
369 | if (baud >= min && baud <= max) | |
370 | return baud; | |
371 | ||
372 | /* | |
373 | * Oops, the quotient was zero. Try again with | |
374 | * the old baud rate if possible. | |
375 | */ | |
376 | termios->c_cflag &= ~CBAUD; | |
377 | if (old) { | |
6d4d67be | 378 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
379 | if (!hung_up) |
380 | tty_termios_encode_baud_rate(termios, | |
381 | baud, baud); | |
1da177e4 LT |
382 | old = NULL; |
383 | continue; | |
384 | } | |
385 | ||
386 | /* | |
16ae2a87 AC |
387 | * As a last resort, if the range cannot be met then clip to |
388 | * the nearest chip supported rate. | |
1da177e4 | 389 | */ |
16ae2a87 AC |
390 | if (!hung_up) { |
391 | if (baud <= min) | |
392 | tty_termios_encode_baud_rate(termios, | |
393 | min + 1, min + 1); | |
394 | else | |
395 | tty_termios_encode_baud_rate(termios, | |
396 | max - 1, max - 1); | |
397 | } | |
1da177e4 | 398 | } |
16ae2a87 AC |
399 | /* Should never happen */ |
400 | WARN_ON(1); | |
1da177e4 LT |
401 | return 0; |
402 | } | |
403 | ||
404 | EXPORT_SYMBOL(uart_get_baud_rate); | |
405 | ||
406 | /** | |
407 | * uart_get_divisor - return uart clock divisor | |
408 | * @port: uart_port structure describing the port. | |
409 | * @baud: desired baud rate | |
410 | * | |
411 | * Calculate the uart clock divisor for the port. | |
412 | */ | |
413 | unsigned int | |
414 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
415 | { | |
416 | unsigned int quot; | |
417 | ||
418 | /* | |
419 | * Old custom speed handling. | |
420 | */ | |
421 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
422 | quot = port->custom_divisor; | |
423 | else | |
97d24634 | 424 | quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); |
1da177e4 LT |
425 | |
426 | return quot; | |
427 | } | |
428 | ||
429 | EXPORT_SYMBOL(uart_get_divisor); | |
430 | ||
23d22cea | 431 | /* FIXME: Consistent locking policy */ |
19225135 AC |
432 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
433 | struct ktermios *old_termios) | |
1da177e4 | 434 | { |
ccce6deb | 435 | struct tty_port *port = &state->port; |
ccce6deb | 436 | struct uart_port *uport = state->uart_port; |
606d099c | 437 | struct ktermios *termios; |
1da177e4 LT |
438 | |
439 | /* | |
440 | * If we have no tty, termios, or the port does not exist, | |
441 | * then we can't set the parameters for this port. | |
442 | */ | |
ccce6deb | 443 | if (!tty || !tty->termios || uport->type == PORT_UNKNOWN) |
1da177e4 LT |
444 | return; |
445 | ||
446 | termios = tty->termios; | |
447 | ||
448 | /* | |
449 | * Set flags based on termios cflag | |
450 | */ | |
451 | if (termios->c_cflag & CRTSCTS) | |
ccce6deb | 452 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 | 453 | else |
ccce6deb | 454 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 LT |
455 | |
456 | if (termios->c_cflag & CLOCAL) | |
ccce6deb | 457 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 458 | else |
ccce6deb | 459 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 460 | |
ccce6deb | 461 | uport->ops->set_termios(uport, termios, old_termios); |
1da177e4 LT |
462 | } |
463 | ||
19225135 AC |
464 | static inline int __uart_put_char(struct uart_port *port, |
465 | struct circ_buf *circ, unsigned char c) | |
1da177e4 LT |
466 | { |
467 | unsigned long flags; | |
23d22cea | 468 | int ret = 0; |
1da177e4 LT |
469 | |
470 | if (!circ->buf) | |
23d22cea | 471 | return 0; |
1da177e4 LT |
472 | |
473 | spin_lock_irqsave(&port->lock, flags); | |
474 | if (uart_circ_chars_free(circ) != 0) { | |
475 | circ->buf[circ->head] = c; | |
476 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 477 | ret = 1; |
1da177e4 LT |
478 | } |
479 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 480 | return ret; |
1da177e4 LT |
481 | } |
482 | ||
23d22cea | 483 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
484 | { |
485 | struct uart_state *state = tty->driver_data; | |
486 | ||
ebd2c8f6 | 487 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
1da177e4 LT |
488 | } |
489 | ||
490 | static void uart_flush_chars(struct tty_struct *tty) | |
491 | { | |
492 | uart_start(tty); | |
493 | } | |
494 | ||
19225135 AC |
495 | static int uart_write(struct tty_struct *tty, |
496 | const unsigned char *buf, int count) | |
1da177e4 LT |
497 | { |
498 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
499 | struct uart_port *port; |
500 | struct circ_buf *circ; | |
1da177e4 LT |
501 | unsigned long flags; |
502 | int c, ret = 0; | |
503 | ||
d5f735e5 PM |
504 | /* |
505 | * This means you called this function _after_ the port was | |
506 | * closed. No cookie for you. | |
507 | */ | |
f751928e | 508 | if (!state) { |
d5f735e5 PM |
509 | WARN_ON(1); |
510 | return -EL3HLT; | |
511 | } | |
512 | ||
ebd2c8f6 AC |
513 | port = state->uart_port; |
514 | circ = &state->xmit; | |
d5f735e5 | 515 | |
1da177e4 LT |
516 | if (!circ->buf) |
517 | return 0; | |
518 | ||
519 | spin_lock_irqsave(&port->lock, flags); | |
520 | while (1) { | |
521 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
522 | if (count < c) | |
523 | c = count; | |
524 | if (c <= 0) | |
525 | break; | |
526 | memcpy(circ->buf + circ->head, buf, c); | |
527 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
528 | buf += c; | |
529 | count -= c; | |
530 | ret += c; | |
531 | } | |
532 | spin_unlock_irqrestore(&port->lock, flags); | |
533 | ||
534 | uart_start(tty); | |
535 | return ret; | |
536 | } | |
537 | ||
538 | static int uart_write_room(struct tty_struct *tty) | |
539 | { | |
540 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
541 | unsigned long flags; |
542 | int ret; | |
1da177e4 | 543 | |
ebd2c8f6 AC |
544 | spin_lock_irqsave(&state->uart_port->lock, flags); |
545 | ret = uart_circ_chars_free(&state->xmit); | |
546 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 547 | return ret; |
1da177e4 LT |
548 | } |
549 | ||
550 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
551 | { | |
552 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
553 | unsigned long flags; |
554 | int ret; | |
1da177e4 | 555 | |
ebd2c8f6 AC |
556 | spin_lock_irqsave(&state->uart_port->lock, flags); |
557 | ret = uart_circ_chars_pending(&state->xmit); | |
558 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 559 | return ret; |
1da177e4 LT |
560 | } |
561 | ||
562 | static void uart_flush_buffer(struct tty_struct *tty) | |
563 | { | |
564 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 565 | struct uart_port *port; |
1da177e4 LT |
566 | unsigned long flags; |
567 | ||
d5f735e5 PM |
568 | /* |
569 | * This means you called this function _after_ the port was | |
570 | * closed. No cookie for you. | |
571 | */ | |
f751928e | 572 | if (!state) { |
d5f735e5 PM |
573 | WARN_ON(1); |
574 | return; | |
575 | } | |
576 | ||
ebd2c8f6 | 577 | port = state->uart_port; |
eb3a1e11 | 578 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
579 | |
580 | spin_lock_irqsave(&port->lock, flags); | |
ebd2c8f6 | 581 | uart_circ_clear(&state->xmit); |
6bb0e3a5 HS |
582 | if (port->ops->flush_buffer) |
583 | port->ops->flush_buffer(port); | |
1da177e4 LT |
584 | spin_unlock_irqrestore(&port->lock, flags); |
585 | tty_wakeup(tty); | |
586 | } | |
587 | ||
588 | /* | |
589 | * This function is used to send a high-priority XON/XOFF character to | |
590 | * the device | |
591 | */ | |
592 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
593 | { | |
594 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 595 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
596 | unsigned long flags; |
597 | ||
598 | if (port->ops->send_xchar) | |
599 | port->ops->send_xchar(port, ch); | |
600 | else { | |
601 | port->x_char = ch; | |
602 | if (ch) { | |
603 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 604 | port->ops->start_tx(port); |
1da177e4 LT |
605 | spin_unlock_irqrestore(&port->lock, flags); |
606 | } | |
607 | } | |
608 | } | |
609 | ||
610 | static void uart_throttle(struct tty_struct *tty) | |
611 | { | |
612 | struct uart_state *state = tty->driver_data; | |
613 | ||
614 | if (I_IXOFF(tty)) | |
615 | uart_send_xchar(tty, STOP_CHAR(tty)); | |
616 | ||
617 | if (tty->termios->c_cflag & CRTSCTS) | |
ebd2c8f6 | 618 | uart_clear_mctrl(state->uart_port, TIOCM_RTS); |
1da177e4 LT |
619 | } |
620 | ||
621 | static void uart_unthrottle(struct tty_struct *tty) | |
622 | { | |
623 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 624 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
625 | |
626 | if (I_IXOFF(tty)) { | |
627 | if (port->x_char) | |
628 | port->x_char = 0; | |
629 | else | |
630 | uart_send_xchar(tty, START_CHAR(tty)); | |
631 | } | |
632 | ||
633 | if (tty->termios->c_cflag & CRTSCTS) | |
634 | uart_set_mctrl(port, TIOCM_RTS); | |
635 | } | |
636 | ||
637 | static int uart_get_info(struct uart_state *state, | |
638 | struct serial_struct __user *retinfo) | |
639 | { | |
a2bceae0 AC |
640 | struct uart_port *uport = state->uart_port; |
641 | struct tty_port *port = &state->port; | |
1da177e4 LT |
642 | struct serial_struct tmp; |
643 | ||
644 | memset(&tmp, 0, sizeof(tmp)); | |
f34d7a5b AC |
645 | |
646 | /* Ensure the state we copy is consistent and no hardware changes | |
647 | occur as we go */ | |
a2bceae0 | 648 | mutex_lock(&port->mutex); |
f34d7a5b | 649 | |
a2bceae0 AC |
650 | tmp.type = uport->type; |
651 | tmp.line = uport->line; | |
652 | tmp.port = uport->iobase; | |
1da177e4 | 653 | if (HIGH_BITS_OFFSET) |
a2bceae0 AC |
654 | tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
655 | tmp.irq = uport->irq; | |
656 | tmp.flags = uport->flags; | |
657 | tmp.xmit_fifo_size = uport->fifosize; | |
658 | tmp.baud_base = uport->uartclk / 16; | |
4cb0fbfd | 659 | tmp.close_delay = jiffies_to_msecs(port->close_delay) / 10; |
016af53a | 660 | tmp.closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
1da177e4 | 661 | ASYNC_CLOSING_WAIT_NONE : |
4cb0fbfd | 662 | jiffies_to_msecs(port->closing_wait) / 10; |
a2bceae0 AC |
663 | tmp.custom_divisor = uport->custom_divisor; |
664 | tmp.hub6 = uport->hub6; | |
665 | tmp.io_type = uport->iotype; | |
666 | tmp.iomem_reg_shift = uport->regshift; | |
667 | tmp.iomem_base = (void *)(unsigned long)uport->mapbase; | |
1da177e4 | 668 | |
a2bceae0 | 669 | mutex_unlock(&port->mutex); |
f34d7a5b | 670 | |
1da177e4 LT |
671 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
672 | return -EFAULT; | |
673 | return 0; | |
674 | } | |
675 | ||
19225135 | 676 | static int uart_set_info(struct tty_struct *tty, struct uart_state *state, |
1da177e4 LT |
677 | struct serial_struct __user *newinfo) |
678 | { | |
679 | struct serial_struct new_serial; | |
46d57a44 AC |
680 | struct uart_port *uport = state->uart_port; |
681 | struct tty_port *port = &state->port; | |
1da177e4 | 682 | unsigned long new_port; |
0077d45e | 683 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 684 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 685 | upf_t old_flags, new_flags; |
1da177e4 LT |
686 | int retval = 0; |
687 | ||
688 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
689 | return -EFAULT; | |
690 | ||
691 | new_port = new_serial.port; | |
692 | if (HIGH_BITS_OFFSET) | |
693 | new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; | |
694 | ||
695 | new_serial.irq = irq_canonicalize(new_serial.irq); | |
4cb0fbfd | 696 | close_delay = msecs_to_jiffies(new_serial.close_delay * 10); |
1da177e4 | 697 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
4cb0fbfd JS |
698 | ASYNC_CLOSING_WAIT_NONE : |
699 | msecs_to_jiffies(new_serial.closing_wait * 10); | |
1da177e4 LT |
700 | |
701 | /* | |
91312cdb | 702 | * This semaphore protects port->count. It is also |
1da177e4 LT |
703 | * very useful to prevent opens. Also, take the |
704 | * port configuration semaphore to make sure that a | |
705 | * module insertion/removal doesn't change anything | |
706 | * under us. | |
707 | */ | |
a2bceae0 | 708 | mutex_lock(&port->mutex); |
1da177e4 | 709 | |
46d57a44 AC |
710 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
711 | && new_serial.irq != uport->irq; | |
1da177e4 LT |
712 | |
713 | /* | |
714 | * Since changing the 'type' of the port changes its resource | |
715 | * allocations, we should treat type changes the same as | |
716 | * IO port changes. | |
717 | */ | |
46d57a44 AC |
718 | change_port = !(uport->flags & UPF_FIXED_PORT) |
719 | && (new_port != uport->iobase || | |
720 | (unsigned long)new_serial.iomem_base != uport->mapbase || | |
721 | new_serial.hub6 != uport->hub6 || | |
722 | new_serial.io_type != uport->iotype || | |
723 | new_serial.iomem_reg_shift != uport->regshift || | |
724 | new_serial.type != uport->type); | |
725 | ||
726 | old_flags = uport->flags; | |
0077d45e | 727 | new_flags = new_serial.flags; |
46d57a44 | 728 | old_custom_divisor = uport->custom_divisor; |
1da177e4 LT |
729 | |
730 | if (!capable(CAP_SYS_ADMIN)) { | |
731 | retval = -EPERM; | |
732 | if (change_irq || change_port || | |
46d57a44 AC |
733 | (new_serial.baud_base != uport->uartclk / 16) || |
734 | (close_delay != port->close_delay) || | |
735 | (closing_wait != port->closing_wait) || | |
947deee8 | 736 | (new_serial.xmit_fifo_size && |
46d57a44 | 737 | new_serial.xmit_fifo_size != uport->fifosize) || |
0077d45e | 738 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 | 739 | goto exit; |
46d57a44 | 740 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
0077d45e | 741 | (new_flags & UPF_USR_MASK)); |
46d57a44 | 742 | uport->custom_divisor = new_serial.custom_divisor; |
1da177e4 LT |
743 | goto check_and_exit; |
744 | } | |
745 | ||
746 | /* | |
747 | * Ask the low level driver to verify the settings. | |
748 | */ | |
46d57a44 AC |
749 | if (uport->ops->verify_port) |
750 | retval = uport->ops->verify_port(uport, &new_serial); | |
1da177e4 | 751 | |
a62c4133 | 752 | if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || |
1da177e4 LT |
753 | (new_serial.baud_base < 9600)) |
754 | retval = -EINVAL; | |
755 | ||
756 | if (retval) | |
757 | goto exit; | |
758 | ||
759 | if (change_port || change_irq) { | |
760 | retval = -EBUSY; | |
761 | ||
762 | /* | |
763 | * Make sure that we are the sole user of this port. | |
764 | */ | |
b58d13a0 | 765 | if (tty_port_users(port) > 1) |
1da177e4 LT |
766 | goto exit; |
767 | ||
768 | /* | |
769 | * We need to shutdown the serial port at the old | |
770 | * port/type/irq combination. | |
771 | */ | |
19225135 | 772 | uart_shutdown(tty, state); |
1da177e4 LT |
773 | } |
774 | ||
775 | if (change_port) { | |
776 | unsigned long old_iobase, old_mapbase; | |
777 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
778 | ||
46d57a44 AC |
779 | old_iobase = uport->iobase; |
780 | old_mapbase = uport->mapbase; | |
781 | old_type = uport->type; | |
782 | old_hub6 = uport->hub6; | |
783 | old_iotype = uport->iotype; | |
784 | old_shift = uport->regshift; | |
1da177e4 LT |
785 | |
786 | /* | |
787 | * Free and release old regions | |
788 | */ | |
789 | if (old_type != PORT_UNKNOWN) | |
46d57a44 | 790 | uport->ops->release_port(uport); |
1da177e4 | 791 | |
46d57a44 AC |
792 | uport->iobase = new_port; |
793 | uport->type = new_serial.type; | |
794 | uport->hub6 = new_serial.hub6; | |
795 | uport->iotype = new_serial.io_type; | |
796 | uport->regshift = new_serial.iomem_reg_shift; | |
797 | uport->mapbase = (unsigned long)new_serial.iomem_base; | |
1da177e4 LT |
798 | |
799 | /* | |
800 | * Claim and map the new regions | |
801 | */ | |
46d57a44 AC |
802 | if (uport->type != PORT_UNKNOWN) { |
803 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
804 | } else { |
805 | /* Always success - Jean II */ | |
806 | retval = 0; | |
807 | } | |
808 | ||
809 | /* | |
810 | * If we fail to request resources for the | |
811 | * new port, try to restore the old settings. | |
812 | */ | |
813 | if (retval && old_type != PORT_UNKNOWN) { | |
46d57a44 AC |
814 | uport->iobase = old_iobase; |
815 | uport->type = old_type; | |
816 | uport->hub6 = old_hub6; | |
817 | uport->iotype = old_iotype; | |
818 | uport->regshift = old_shift; | |
819 | uport->mapbase = old_mapbase; | |
820 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
821 | /* |
822 | * If we failed to restore the old settings, | |
823 | * we fail like this. | |
824 | */ | |
825 | if (retval) | |
46d57a44 | 826 | uport->type = PORT_UNKNOWN; |
1da177e4 LT |
827 | |
828 | /* | |
829 | * We failed anyway. | |
830 | */ | |
831 | retval = -EBUSY; | |
a46c9994 AC |
832 | /* Added to return the correct error -Ram Gupta */ |
833 | goto exit; | |
1da177e4 LT |
834 | } |
835 | } | |
836 | ||
abb4a239 | 837 | if (change_irq) |
46d57a44 AC |
838 | uport->irq = new_serial.irq; |
839 | if (!(uport->flags & UPF_FIXED_PORT)) | |
840 | uport->uartclk = new_serial.baud_base * 16; | |
841 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | | |
0077d45e | 842 | (new_flags & UPF_CHANGE_MASK); |
46d57a44 AC |
843 | uport->custom_divisor = new_serial.custom_divisor; |
844 | port->close_delay = close_delay; | |
845 | port->closing_wait = closing_wait; | |
947deee8 | 846 | if (new_serial.xmit_fifo_size) |
46d57a44 AC |
847 | uport->fifosize = new_serial.xmit_fifo_size; |
848 | if (port->tty) | |
849 | port->tty->low_latency = | |
850 | (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
1da177e4 LT |
851 | |
852 | check_and_exit: | |
853 | retval = 0; | |
46d57a44 | 854 | if (uport->type == PORT_UNKNOWN) |
1da177e4 | 855 | goto exit; |
ccce6deb | 856 | if (port->flags & ASYNC_INITIALIZED) { |
46d57a44 AC |
857 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
858 | old_custom_divisor != uport->custom_divisor) { | |
1da177e4 LT |
859 | /* |
860 | * If they're setting up a custom divisor or speed, | |
861 | * instead of clearing it, then bitch about it. No | |
862 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
863 | */ | |
46d57a44 | 864 | if (uport->flags & UPF_SPD_MASK) { |
1da177e4 LT |
865 | char buf[64]; |
866 | printk(KERN_NOTICE | |
867 | "%s sets custom speed on %s. This " | |
868 | "is deprecated.\n", current->comm, | |
46d57a44 | 869 | tty_name(port->tty, buf)); |
1da177e4 | 870 | } |
19225135 | 871 | uart_change_speed(tty, state, NULL); |
1da177e4 LT |
872 | } |
873 | } else | |
19225135 | 874 | retval = uart_startup(tty, state, 1); |
1da177e4 | 875 | exit: |
a2bceae0 | 876 | mutex_unlock(&port->mutex); |
1da177e4 LT |
877 | return retval; |
878 | } | |
879 | ||
19225135 AC |
880 | /** |
881 | * uart_get_lsr_info - get line status register info | |
882 | * @tty: tty associated with the UART | |
883 | * @state: UART being queried | |
884 | * @value: returned modem value | |
885 | * | |
886 | * Note: uart_ioctl protects us against hangups. | |
1da177e4 | 887 | */ |
19225135 AC |
888 | static int uart_get_lsr_info(struct tty_struct *tty, |
889 | struct uart_state *state, unsigned int __user *value) | |
1da177e4 | 890 | { |
46d57a44 | 891 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
892 | unsigned int result; |
893 | ||
46d57a44 | 894 | result = uport->ops->tx_empty(uport); |
1da177e4 LT |
895 | |
896 | /* | |
897 | * If we're about to load something into the transmit | |
898 | * register, we'll pretend the transmitter isn't empty to | |
899 | * avoid a race condition (depending on when the transmit | |
900 | * interrupt happens). | |
901 | */ | |
46d57a44 | 902 | if (uport->x_char || |
ebd2c8f6 | 903 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
19225135 | 904 | !tty->stopped && !tty->hw_stopped)) |
1da177e4 | 905 | result &= ~TIOCSER_TEMT; |
a46c9994 | 906 | |
1da177e4 LT |
907 | return put_user(result, value); |
908 | } | |
909 | ||
60b33c13 | 910 | static int uart_tiocmget(struct tty_struct *tty) |
1da177e4 LT |
911 | { |
912 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 913 | struct tty_port *port = &state->port; |
46d57a44 | 914 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
915 | int result = -EIO; |
916 | ||
a2bceae0 | 917 | mutex_lock(&port->mutex); |
60b33c13 | 918 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 919 | result = uport->mctrl; |
46d57a44 AC |
920 | spin_lock_irq(&uport->lock); |
921 | result |= uport->ops->get_mctrl(uport); | |
922 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 923 | } |
a2bceae0 | 924 | mutex_unlock(&port->mutex); |
1da177e4 LT |
925 | |
926 | return result; | |
927 | } | |
928 | ||
929 | static int | |
20b9d177 | 930 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
1da177e4 LT |
931 | { |
932 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 933 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 934 | struct tty_port *port = &state->port; |
1da177e4 LT |
935 | int ret = -EIO; |
936 | ||
a2bceae0 | 937 | mutex_lock(&port->mutex); |
20b9d177 | 938 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 939 | uart_update_mctrl(uport, set, clear); |
1da177e4 LT |
940 | ret = 0; |
941 | } | |
a2bceae0 | 942 | mutex_unlock(&port->mutex); |
1da177e4 LT |
943 | return ret; |
944 | } | |
945 | ||
9e98966c | 946 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
947 | { |
948 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 949 | struct tty_port *port = &state->port; |
46d57a44 | 950 | struct uart_port *uport = state->uart_port; |
1da177e4 | 951 | |
a2bceae0 | 952 | mutex_lock(&port->mutex); |
1da177e4 | 953 | |
46d57a44 AC |
954 | if (uport->type != PORT_UNKNOWN) |
955 | uport->ops->break_ctl(uport, break_state); | |
1da177e4 | 956 | |
a2bceae0 | 957 | mutex_unlock(&port->mutex); |
9e98966c | 958 | return 0; |
1da177e4 LT |
959 | } |
960 | ||
19225135 | 961 | static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) |
1da177e4 | 962 | { |
46d57a44 | 963 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 964 | struct tty_port *port = &state->port; |
1da177e4 LT |
965 | int flags, ret; |
966 | ||
967 | if (!capable(CAP_SYS_ADMIN)) | |
968 | return -EPERM; | |
969 | ||
970 | /* | |
971 | * Take the per-port semaphore. This prevents count from | |
972 | * changing, and hence any extra opens of the port while | |
973 | * we're auto-configuring. | |
974 | */ | |
a2bceae0 | 975 | if (mutex_lock_interruptible(&port->mutex)) |
1da177e4 LT |
976 | return -ERESTARTSYS; |
977 | ||
978 | ret = -EBUSY; | |
b58d13a0 | 979 | if (tty_port_users(port) == 1) { |
19225135 | 980 | uart_shutdown(tty, state); |
1da177e4 LT |
981 | |
982 | /* | |
983 | * If we already have a port type configured, | |
984 | * we must release its resources. | |
985 | */ | |
46d57a44 AC |
986 | if (uport->type != PORT_UNKNOWN) |
987 | uport->ops->release_port(uport); | |
1da177e4 LT |
988 | |
989 | flags = UART_CONFIG_TYPE; | |
46d57a44 | 990 | if (uport->flags & UPF_AUTO_IRQ) |
1da177e4 LT |
991 | flags |= UART_CONFIG_IRQ; |
992 | ||
993 | /* | |
994 | * This will claim the ports resources if | |
995 | * a port is found. | |
996 | */ | |
46d57a44 | 997 | uport->ops->config_port(uport, flags); |
1da177e4 | 998 | |
19225135 | 999 | ret = uart_startup(tty, state, 1); |
1da177e4 | 1000 | } |
a2bceae0 | 1001 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1002 | return ret; |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1007 | * - mask passed in arg for lines of interest | |
1008 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1009 | * Caller should use TIOCGICOUNT to see which one it was | |
bdc04e31 AC |
1010 | * |
1011 | * FIXME: This wants extracting into a common all driver implementation | |
1012 | * of TIOCMWAIT using tty_port. | |
1da177e4 LT |
1013 | */ |
1014 | static int | |
1015 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
1016 | { | |
46d57a44 | 1017 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 1018 | struct tty_port *port = &state->port; |
1da177e4 LT |
1019 | DECLARE_WAITQUEUE(wait, current); |
1020 | struct uart_icount cprev, cnow; | |
1021 | int ret; | |
1022 | ||
1023 | /* | |
1024 | * note the counters on entry | |
1025 | */ | |
46d57a44 AC |
1026 | spin_lock_irq(&uport->lock); |
1027 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); | |
1da177e4 LT |
1028 | |
1029 | /* | |
1030 | * Force modem status interrupts on | |
1031 | */ | |
46d57a44 AC |
1032 | uport->ops->enable_ms(uport); |
1033 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1034 | |
bdc04e31 | 1035 | add_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 | 1036 | for (;;) { |
46d57a44 AC |
1037 | spin_lock_irq(&uport->lock); |
1038 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1039 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1040 | |
1041 | set_current_state(TASK_INTERRUPTIBLE); | |
1042 | ||
1043 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1044 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1045 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1046 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1047 | ret = 0; |
1048 | break; | |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | schedule(); | |
1052 | ||
1053 | /* see if a signal did it */ | |
1054 | if (signal_pending(current)) { | |
1055 | ret = -ERESTARTSYS; | |
1056 | break; | |
1057 | } | |
1058 | ||
1059 | cprev = cnow; | |
1060 | } | |
1061 | ||
1062 | current->state = TASK_RUNNING; | |
bdc04e31 | 1063 | remove_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 LT |
1064 | |
1065 | return ret; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1070 | * Return: write counters to the user passed counter struct | |
1071 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1072 | * RI where only 0->1 is counted. | |
1073 | */ | |
d281da7f AC |
1074 | static int uart_get_icount(struct tty_struct *tty, |
1075 | struct serial_icounter_struct *icount) | |
1da177e4 | 1076 | { |
d281da7f | 1077 | struct uart_state *state = tty->driver_data; |
1da177e4 | 1078 | struct uart_icount cnow; |
46d57a44 | 1079 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1080 | |
46d57a44 AC |
1081 | spin_lock_irq(&uport->lock); |
1082 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1083 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1084 | |
d281da7f AC |
1085 | icount->cts = cnow.cts; |
1086 | icount->dsr = cnow.dsr; | |
1087 | icount->rng = cnow.rng; | |
1088 | icount->dcd = cnow.dcd; | |
1089 | icount->rx = cnow.rx; | |
1090 | icount->tx = cnow.tx; | |
1091 | icount->frame = cnow.frame; | |
1092 | icount->overrun = cnow.overrun; | |
1093 | icount->parity = cnow.parity; | |
1094 | icount->brk = cnow.brk; | |
1095 | icount->buf_overrun = cnow.buf_overrun; | |
1096 | ||
1097 | return 0; | |
1da177e4 LT |
1098 | } |
1099 | ||
1100 | /* | |
e5238442 | 1101 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1102 | */ |
1103 | static int | |
6caa76b7 | 1104 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, |
1da177e4 LT |
1105 | unsigned long arg) |
1106 | { | |
1107 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1108 | struct tty_port *port = &state->port; |
1da177e4 LT |
1109 | void __user *uarg = (void __user *)arg; |
1110 | int ret = -ENOIOCTLCMD; | |
1111 | ||
1da177e4 LT |
1112 | |
1113 | /* | |
1114 | * These ioctls don't rely on the hardware to be present. | |
1115 | */ | |
1116 | switch (cmd) { | |
1117 | case TIOCGSERIAL: | |
1118 | ret = uart_get_info(state, uarg); | |
1119 | break; | |
1120 | ||
1121 | case TIOCSSERIAL: | |
19225135 | 1122 | ret = uart_set_info(tty, state, uarg); |
1da177e4 LT |
1123 | break; |
1124 | ||
1125 | case TIOCSERCONFIG: | |
19225135 | 1126 | ret = uart_do_autoconfig(tty, state); |
1da177e4 LT |
1127 | break; |
1128 | ||
1129 | case TIOCSERGWILD: /* obsolete */ | |
1130 | case TIOCSERSWILD: /* obsolete */ | |
1131 | ret = 0; | |
1132 | break; | |
1133 | } | |
1134 | ||
1135 | if (ret != -ENOIOCTLCMD) | |
1136 | goto out; | |
1137 | ||
1138 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1139 | ret = -EIO; | |
1140 | goto out; | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * The following should only be used when hardware is present. | |
1145 | */ | |
1146 | switch (cmd) { | |
1147 | case TIOCMIWAIT: | |
1148 | ret = uart_wait_modem_status(state, arg); | |
1149 | break; | |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | if (ret != -ENOIOCTLCMD) | |
1153 | goto out; | |
1154 | ||
a2bceae0 | 1155 | mutex_lock(&port->mutex); |
1da177e4 | 1156 | |
6caa76b7 | 1157 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
1da177e4 LT |
1158 | ret = -EIO; |
1159 | goto out_up; | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * All these rely on hardware being present and need to be | |
1164 | * protected against the tty being hung up. | |
1165 | */ | |
1166 | switch (cmd) { | |
1167 | case TIOCSERGETLSR: /* Get line status register */ | |
19225135 | 1168 | ret = uart_get_lsr_info(tty, state, uarg); |
1da177e4 LT |
1169 | break; |
1170 | ||
1171 | default: { | |
46d57a44 AC |
1172 | struct uart_port *uport = state->uart_port; |
1173 | if (uport->ops->ioctl) | |
1174 | ret = uport->ops->ioctl(uport, cmd, arg); | |
1da177e4 LT |
1175 | break; |
1176 | } | |
1177 | } | |
f34d7a5b | 1178 | out_up: |
a2bceae0 | 1179 | mutex_unlock(&port->mutex); |
f34d7a5b | 1180 | out: |
1da177e4 LT |
1181 | return ret; |
1182 | } | |
1183 | ||
edeb280e | 1184 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1185 | { |
1186 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1187 | struct uart_port *uport = state->uart_port; |
64e9159f | 1188 | |
46d57a44 | 1189 | if (uport->ops->set_ldisc) |
d87d9b7d | 1190 | uport->ops->set_ldisc(uport, tty->termios->c_line); |
64e9159f AC |
1191 | } |
1192 | ||
a46c9994 AC |
1193 | static void uart_set_termios(struct tty_struct *tty, |
1194 | struct ktermios *old_termios) | |
1da177e4 LT |
1195 | { |
1196 | struct uart_state *state = tty->driver_data; | |
1197 | unsigned long flags; | |
1198 | unsigned int cflag = tty->termios->c_cflag; | |
1199 | ||
1da177e4 LT |
1200 | |
1201 | /* | |
1202 | * These are the bits that are used to setup various | |
20620d68 DW |
1203 | * flags in the low level driver. We can ignore the Bfoo |
1204 | * bits in c_cflag; c_[io]speed will always be set | |
1205 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 LT |
1206 | */ |
1207 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
1da177e4 | 1208 | if ((cflag ^ old_termios->c_cflag) == 0 && |
20620d68 DW |
1209 | tty->termios->c_ospeed == old_termios->c_ospeed && |
1210 | tty->termios->c_ispeed == old_termios->c_ispeed && | |
e5238442 | 1211 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { |
1da177e4 | 1212 | return; |
e5238442 | 1213 | } |
1da177e4 | 1214 | |
19225135 | 1215 | uart_change_speed(tty, state, old_termios); |
1da177e4 LT |
1216 | |
1217 | /* Handle transition to B0 status */ | |
1218 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
ebd2c8f6 | 1219 | uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 1220 | /* Handle transition away from B0 status */ |
82cb7ba1 | 1221 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 LT |
1222 | unsigned int mask = TIOCM_DTR; |
1223 | if (!(cflag & CRTSCTS) || | |
1224 | !test_bit(TTY_THROTTLED, &tty->flags)) | |
1225 | mask |= TIOCM_RTS; | |
ebd2c8f6 | 1226 | uart_set_mctrl(state->uart_port, mask); |
1da177e4 LT |
1227 | } |
1228 | ||
1229 | /* Handle turning off CRTSCTS */ | |
1230 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
ebd2c8f6 | 1231 | spin_lock_irqsave(&state->uart_port->lock, flags); |
1da177e4 LT |
1232 | tty->hw_stopped = 0; |
1233 | __uart_start(tty); | |
ebd2c8f6 | 1234 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
1da177e4 | 1235 | } |
0dd7a1ae | 1236 | /* Handle turning on CRTSCTS */ |
82cb7ba1 | 1237 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
ebd2c8f6 AC |
1238 | spin_lock_irqsave(&state->uart_port->lock, flags); |
1239 | if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { | |
0dd7a1ae | 1240 | tty->hw_stopped = 1; |
ebd2c8f6 | 1241 | state->uart_port->ops->stop_tx(state->uart_port); |
0dd7a1ae | 1242 | } |
ebd2c8f6 | 1243 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
0dd7a1ae | 1244 | } |
1da177e4 LT |
1245 | } |
1246 | ||
1247 | /* | |
1248 | * In 2.4.5, calls to this will be serialized via the BKL in | |
1249 | * linux/drivers/char/tty_io.c:tty_release() | |
1250 | * linux/drivers/char/tty_io.c:do_tty_handup() | |
1251 | */ | |
1252 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1253 | { | |
1254 | struct uart_state *state = tty->driver_data; | |
46d57a44 AC |
1255 | struct tty_port *port; |
1256 | struct uart_port *uport; | |
61cd8a21 | 1257 | unsigned long flags; |
a46c9994 | 1258 | |
eea7e17e LT |
1259 | if (!state) |
1260 | return; | |
1261 | ||
46d57a44 AC |
1262 | uport = state->uart_port; |
1263 | port = &state->port; | |
1da177e4 | 1264 | |
46d57a44 | 1265 | pr_debug("uart_close(%d) called\n", uport->line); |
1da177e4 | 1266 | |
d30ccf08 | 1267 | if (tty_port_close_start(port, tty, filp) == 0) |
55956216 | 1268 | return; |
1da177e4 LT |
1269 | |
1270 | /* | |
1271 | * At this point, we stop accepting input. To do this, we | |
1272 | * disable the receive line status interrupts. | |
1273 | */ | |
ccce6deb | 1274 | if (port->flags & ASYNC_INITIALIZED) { |
1da177e4 | 1275 | unsigned long flags; |
eea7e17e | 1276 | spin_lock_irqsave(&uport->lock, flags); |
46d57a44 | 1277 | uport->ops->stop_rx(uport); |
eea7e17e | 1278 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 LT |
1279 | /* |
1280 | * Before we drop DTR, make sure the UART transmitter | |
1281 | * has completely drained; this is especially | |
1282 | * important if there is a transmit FIFO! | |
1283 | */ | |
1f33a51d | 1284 | uart_wait_until_sent(tty, uport->timeout); |
1da177e4 LT |
1285 | } |
1286 | ||
bafb0bd2 | 1287 | mutex_lock(&port->mutex); |
19225135 | 1288 | uart_shutdown(tty, state); |
1da177e4 LT |
1289 | uart_flush_buffer(tty); |
1290 | ||
a46c9994 AC |
1291 | tty_ldisc_flush(tty); |
1292 | ||
7b01478f | 1293 | tty_port_tty_set(port, NULL); |
61cd8a21 AC |
1294 | spin_lock_irqsave(&port->lock, flags); |
1295 | tty->closing = 0; | |
1da177e4 | 1296 | |
46d57a44 | 1297 | if (port->blocked_open) { |
61cd8a21 | 1298 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1299 | if (port->close_delay) |
4cb0fbfd JS |
1300 | msleep_interruptible( |
1301 | jiffies_to_msecs(port->close_delay)); | |
61cd8a21 | 1302 | spin_lock_irqsave(&port->lock, flags); |
46d57a44 | 1303 | } else if (!uart_console(uport)) { |
61cd8a21 | 1304 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 1305 | uart_change_pm(state, 3); |
61cd8a21 | 1306 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | /* | |
1310 | * Wake up anyone trying to open this port. | |
1311 | */ | |
ccce6deb | 1312 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
426929f8 | 1313 | clear_bit(ASYNCB_CLOSING, &port->flags); |
61cd8a21 | 1314 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1315 | wake_up_interruptible(&port->open_wait); |
426929f8 | 1316 | wake_up_interruptible(&port->close_wait); |
1da177e4 | 1317 | |
a2bceae0 | 1318 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1319 | } |
1320 | ||
1f33a51d | 1321 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
1da177e4 | 1322 | { |
1f33a51d JS |
1323 | struct uart_state *state = tty->driver_data; |
1324 | struct uart_port *port = state->uart_port; | |
1da177e4 LT |
1325 | unsigned long char_time, expire; |
1326 | ||
1da177e4 LT |
1327 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1328 | return; | |
1329 | ||
1330 | /* | |
1331 | * Set the check interval to be 1/5 of the estimated time to | |
1332 | * send a single character, and make it at least 1. The check | |
1333 | * interval should also be less than the timeout. | |
1334 | * | |
1335 | * Note: we have to use pretty tight timings here to satisfy | |
1336 | * the NIST-PCTS. | |
1337 | */ | |
1338 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1339 | char_time = char_time / 5; | |
1340 | if (char_time == 0) | |
1341 | char_time = 1; | |
1342 | if (timeout && timeout < char_time) | |
1343 | char_time = timeout; | |
1344 | ||
1345 | /* | |
1346 | * If the transmitter hasn't cleared in twice the approximate | |
1347 | * amount of time to send the entire FIFO, it probably won't | |
1348 | * ever clear. This assumes the UART isn't doing flow | |
1349 | * control, which is currently the case. Hence, if it ever | |
1350 | * takes longer than port->timeout, this is probably due to a | |
1351 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1352 | * 2*port->timeout. | |
1353 | */ | |
1354 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1355 | timeout = 2 * port->timeout; | |
1356 | ||
1357 | expire = jiffies + timeout; | |
1358 | ||
eb3a1e11 | 1359 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1360 | port->line, jiffies, expire); |
1da177e4 LT |
1361 | |
1362 | /* | |
1363 | * Check whether the transmitter is empty every 'char_time'. | |
1364 | * 'timeout' / 'expire' give us the maximum amount of time | |
1365 | * we wait. | |
1366 | */ | |
1367 | while (!port->ops->tx_empty(port)) { | |
1368 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1369 | if (signal_pending(current)) | |
1370 | break; | |
1371 | if (time_after(jiffies, expire)) | |
1372 | break; | |
1373 | } | |
20365219 AB |
1374 | } |
1375 | ||
1da177e4 LT |
1376 | /* |
1377 | * This is called with the BKL held in | |
1378 | * linux/drivers/char/tty_io.c:do_tty_hangup() | |
1379 | * We're called from the eventd thread, so we can sleep for | |
1380 | * a _short_ time only. | |
1381 | */ | |
1382 | static void uart_hangup(struct tty_struct *tty) | |
1383 | { | |
1384 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1385 | struct tty_port *port = &state->port; |
61cd8a21 | 1386 | unsigned long flags; |
1da177e4 | 1387 | |
ebd2c8f6 | 1388 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
1da177e4 | 1389 | |
a2bceae0 | 1390 | mutex_lock(&port->mutex); |
ccce6deb | 1391 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
1da177e4 | 1392 | uart_flush_buffer(tty); |
19225135 | 1393 | uart_shutdown(tty, state); |
61cd8a21 | 1394 | spin_lock_irqsave(&port->lock, flags); |
91312cdb | 1395 | port->count = 0; |
ccce6deb | 1396 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
61cd8a21 | 1397 | spin_unlock_irqrestore(&port->lock, flags); |
7b01478f | 1398 | tty_port_tty_set(port, NULL); |
46d57a44 | 1399 | wake_up_interruptible(&port->open_wait); |
bdc04e31 | 1400 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 | 1401 | } |
a2bceae0 | 1402 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1403 | } |
1404 | ||
0b1db830 JS |
1405 | static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) |
1406 | { | |
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | static void uart_port_shutdown(struct tty_port *port) | |
1411 | { | |
b922e19d JS |
1412 | struct uart_state *state = container_of(port, struct uart_state, port); |
1413 | struct uart_port *uport = state->uart_port; | |
1414 | ||
1415 | /* | |
1416 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
1417 | * the irq here so the queue might never be woken up. Note | |
1418 | * that we won't end up waiting on delta_msr_wait again since | |
1419 | * any outstanding file descriptors should be pointing at | |
1420 | * hung_up_tty_fops now. | |
1421 | */ | |
1422 | wake_up_interruptible(&port->delta_msr_wait); | |
1423 | ||
1424 | /* | |
1425 | * Free the IRQ and disable the port. | |
1426 | */ | |
1427 | uport->ops->shutdown(uport); | |
1428 | ||
1429 | /* | |
1430 | * Ensure that the IRQ handler isn't running on another CPU. | |
1431 | */ | |
1432 | synchronize_irq(uport->irq); | |
0b1db830 JS |
1433 | } |
1434 | ||
de0c8cb3 AC |
1435 | static int uart_carrier_raised(struct tty_port *port) |
1436 | { | |
1437 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1438 | struct uart_port *uport = state->uart_port; | |
1439 | int mctrl; | |
de0c8cb3 AC |
1440 | spin_lock_irq(&uport->lock); |
1441 | uport->ops->enable_ms(uport); | |
1442 | mctrl = uport->ops->get_mctrl(uport); | |
1443 | spin_unlock_irq(&uport->lock); | |
de0c8cb3 AC |
1444 | if (mctrl & TIOCM_CAR) |
1445 | return 1; | |
1446 | return 0; | |
1447 | } | |
1448 | ||
1449 | static void uart_dtr_rts(struct tty_port *port, int onoff) | |
1450 | { | |
1451 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1452 | struct uart_port *uport = state->uart_port; | |
24fcc7c8 | 1453 | |
6f5c24ad | 1454 | if (onoff) |
de0c8cb3 AC |
1455 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
1456 | else | |
1457 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); | |
de0c8cb3 AC |
1458 | } |
1459 | ||
1da177e4 | 1460 | /* |
922f9cfa DC |
1461 | * calls to uart_open are serialised by the BKL in |
1462 | * fs/char_dev.c:chrdev_open() | |
1da177e4 LT |
1463 | * Note that if this fails, then uart_close() _will_ be called. |
1464 | * | |
1465 | * In time, we want to scrap the "opening nonpresent ports" | |
1466 | * behaviour and implement an alternative way for setserial | |
1467 | * to set base addresses/ports/types. This will allow us to | |
1468 | * get rid of a certain amount of extra tests. | |
1469 | */ | |
1470 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1471 | { | |
1472 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1da177e4 | 1473 | int retval, line = tty->index; |
1c7b13c4 JS |
1474 | struct uart_state *state = drv->state + line; |
1475 | struct tty_port *port = &state->port; | |
1da177e4 | 1476 | |
eb3a1e11 | 1477 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 | 1478 | |
1da177e4 | 1479 | /* |
1c7b13c4 JS |
1480 | * We take the semaphore here to guarantee that we won't be re-entered |
1481 | * while allocating the state structure, or while we request any IRQs | |
1482 | * that the driver may need. This also has the nice side-effect that | |
1483 | * it delays the action of uart_hangup, so we can guarantee that | |
1484 | * state->port.tty will always contain something reasonable. | |
1da177e4 | 1485 | */ |
1c7b13c4 JS |
1486 | if (mutex_lock_interruptible(&port->mutex)) { |
1487 | retval = -ERESTARTSYS; | |
1488 | goto end; | |
1489 | } | |
1490 | ||
1491 | port->count++; | |
1492 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { | |
1493 | retval = -ENXIO; | |
1494 | goto err_dec_count; | |
1da177e4 LT |
1495 | } |
1496 | ||
1497 | /* | |
1498 | * Once we set tty->driver_data here, we are guaranteed that | |
1499 | * uart_close() will decrement the driver module use count. | |
1500 | * Any failures from here onwards should not touch the count. | |
1501 | */ | |
1502 | tty->driver_data = state; | |
ebd2c8f6 AC |
1503 | state->uart_port->state = state; |
1504 | tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
7b01478f | 1505 | tty_port_tty_set(port, tty); |
1da177e4 LT |
1506 | |
1507 | /* | |
1508 | * If the port is in the middle of closing, bail out now. | |
1509 | */ | |
1510 | if (tty_hung_up_p(filp)) { | |
1511 | retval = -EAGAIN; | |
1c7b13c4 | 1512 | goto err_dec_count; |
1da177e4 LT |
1513 | } |
1514 | ||
1515 | /* | |
1516 | * Make sure the device is in D0 state. | |
1517 | */ | |
91312cdb | 1518 | if (port->count == 1) |
1da177e4 LT |
1519 | uart_change_pm(state, 0); |
1520 | ||
1521 | /* | |
1522 | * Start up the serial port. | |
1523 | */ | |
19225135 | 1524 | retval = uart_startup(tty, state, 0); |
1da177e4 LT |
1525 | |
1526 | /* | |
1527 | * If we succeeded, wait until the port is ready. | |
1528 | */ | |
61cd8a21 | 1529 | mutex_unlock(&port->mutex); |
1da177e4 | 1530 | if (retval == 0) |
74c21077 | 1531 | retval = tty_port_block_til_ready(port, tty, filp); |
1da177e4 | 1532 | |
1c7b13c4 | 1533 | end: |
1da177e4 | 1534 | return retval; |
1c7b13c4 JS |
1535 | err_dec_count: |
1536 | port->count--; | |
1537 | mutex_unlock(&port->mutex); | |
1538 | goto end; | |
1da177e4 LT |
1539 | } |
1540 | ||
1541 | static const char *uart_type(struct uart_port *port) | |
1542 | { | |
1543 | const char *str = NULL; | |
1544 | ||
1545 | if (port->ops->type) | |
1546 | str = port->ops->type(port); | |
1547 | ||
1548 | if (!str) | |
1549 | str = "unknown"; | |
1550 | ||
1551 | return str; | |
1552 | } | |
1553 | ||
1554 | #ifdef CONFIG_PROC_FS | |
1555 | ||
d196a949 | 1556 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1da177e4 LT |
1557 | { |
1558 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 1559 | struct tty_port *port = &state->port; |
3689a0ec | 1560 | int pm_state; |
a2bceae0 | 1561 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
1562 | char stat_buf[32]; |
1563 | unsigned int status; | |
d196a949 | 1564 | int mmio; |
1da177e4 | 1565 | |
a2bceae0 | 1566 | if (!uport) |
d196a949 | 1567 | return; |
1da177e4 | 1568 | |
a2bceae0 | 1569 | mmio = uport->iotype >= UPIO_MEM; |
d196a949 | 1570 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
a2bceae0 | 1571 | uport->line, uart_type(uport), |
6c6a2334 | 1572 | mmio ? "mmio:0x" : "port:", |
a2bceae0 AC |
1573 | mmio ? (unsigned long long)uport->mapbase |
1574 | : (unsigned long long)uport->iobase, | |
1575 | uport->irq); | |
1da177e4 | 1576 | |
a2bceae0 | 1577 | if (uport->type == PORT_UNKNOWN) { |
d196a949 AD |
1578 | seq_putc(m, '\n'); |
1579 | return; | |
1da177e4 LT |
1580 | } |
1581 | ||
a46c9994 | 1582 | if (capable(CAP_SYS_ADMIN)) { |
a2bceae0 | 1583 | mutex_lock(&port->mutex); |
3689a0ec GD |
1584 | pm_state = state->pm_state; |
1585 | if (pm_state) | |
1586 | uart_change_pm(state, 0); | |
a2bceae0 AC |
1587 | spin_lock_irq(&uport->lock); |
1588 | status = uport->ops->get_mctrl(uport); | |
1589 | spin_unlock_irq(&uport->lock); | |
3689a0ec GD |
1590 | if (pm_state) |
1591 | uart_change_pm(state, pm_state); | |
a2bceae0 | 1592 | mutex_unlock(&port->mutex); |
1da177e4 | 1593 | |
d196a949 | 1594 | seq_printf(m, " tx:%d rx:%d", |
a2bceae0 AC |
1595 | uport->icount.tx, uport->icount.rx); |
1596 | if (uport->icount.frame) | |
d196a949 | 1597 | seq_printf(m, " fe:%d", |
a2bceae0 AC |
1598 | uport->icount.frame); |
1599 | if (uport->icount.parity) | |
d196a949 | 1600 | seq_printf(m, " pe:%d", |
a2bceae0 AC |
1601 | uport->icount.parity); |
1602 | if (uport->icount.brk) | |
d196a949 | 1603 | seq_printf(m, " brk:%d", |
a2bceae0 AC |
1604 | uport->icount.brk); |
1605 | if (uport->icount.overrun) | |
d196a949 | 1606 | seq_printf(m, " oe:%d", |
a2bceae0 | 1607 | uport->icount.overrun); |
a46c9994 AC |
1608 | |
1609 | #define INFOBIT(bit, str) \ | |
a2bceae0 | 1610 | if (uport->mctrl & (bit)) \ |
1da177e4 LT |
1611 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1612 | strlen(stat_buf) - 2) | |
a46c9994 | 1613 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1614 | if (status & (bit)) \ |
1615 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1616 | strlen(stat_buf) - 2) | |
1617 | ||
1618 | stat_buf[0] = '\0'; | |
1619 | stat_buf[1] = '\0'; | |
1620 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1621 | STATBIT(TIOCM_CTS, "|CTS"); | |
1622 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1623 | STATBIT(TIOCM_DSR, "|DSR"); | |
1624 | STATBIT(TIOCM_CAR, "|CD"); | |
1625 | STATBIT(TIOCM_RNG, "|RI"); | |
1626 | if (stat_buf[0]) | |
1627 | stat_buf[0] = ' '; | |
a46c9994 | 1628 | |
d196a949 | 1629 | seq_puts(m, stat_buf); |
1da177e4 | 1630 | } |
d196a949 | 1631 | seq_putc(m, '\n'); |
1da177e4 LT |
1632 | #undef STATBIT |
1633 | #undef INFOBIT | |
1da177e4 LT |
1634 | } |
1635 | ||
d196a949 | 1636 | static int uart_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1637 | { |
833bb304 | 1638 | struct tty_driver *ttydrv = m->private; |
1da177e4 | 1639 | struct uart_driver *drv = ttydrv->driver_state; |
d196a949 | 1640 | int i; |
1da177e4 | 1641 | |
d196a949 | 1642 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
1da177e4 | 1643 | "", "", ""); |
d196a949 AD |
1644 | for (i = 0; i < drv->nr; i++) |
1645 | uart_line_info(m, drv, i); | |
1646 | return 0; | |
1da177e4 | 1647 | } |
d196a949 AD |
1648 | |
1649 | static int uart_proc_open(struct inode *inode, struct file *file) | |
1650 | { | |
1651 | return single_open(file, uart_proc_show, PDE(inode)->data); | |
1652 | } | |
1653 | ||
1654 | static const struct file_operations uart_proc_fops = { | |
1655 | .owner = THIS_MODULE, | |
1656 | .open = uart_proc_open, | |
1657 | .read = seq_read, | |
1658 | .llseek = seq_lseek, | |
1659 | .release = single_release, | |
1660 | }; | |
1da177e4 LT |
1661 | #endif |
1662 | ||
4a1b5502 | 1663 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1664 | /* |
1665 | * uart_console_write - write a console message to a serial port | |
1666 | * @port: the port to write the message | |
1667 | * @s: array of characters | |
1668 | * @count: number of characters in string to write | |
1669 | * @write: function to write character to port | |
1670 | */ | |
1671 | void uart_console_write(struct uart_port *port, const char *s, | |
1672 | unsigned int count, | |
1673 | void (*putchar)(struct uart_port *, int)) | |
1674 | { | |
1675 | unsigned int i; | |
1676 | ||
1677 | for (i = 0; i < count; i++, s++) { | |
1678 | if (*s == '\n') | |
1679 | putchar(port, '\r'); | |
1680 | putchar(port, *s); | |
1681 | } | |
1682 | } | |
1683 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1684 | ||
1da177e4 LT |
1685 | /* |
1686 | * Check whether an invalid uart number has been specified, and | |
1687 | * if so, search for the first available port that does have | |
1688 | * console support. | |
1689 | */ | |
1690 | struct uart_port * __init | |
1691 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1692 | { | |
1693 | int idx = co->index; | |
1694 | ||
1695 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1696 | ports[idx].membase == NULL)) | |
1697 | for (idx = 0; idx < nr; idx++) | |
1698 | if (ports[idx].iobase != 0 || | |
1699 | ports[idx].membase != NULL) | |
1700 | break; | |
1701 | ||
1702 | co->index = idx; | |
1703 | ||
1704 | return ports + idx; | |
1705 | } | |
1706 | ||
1707 | /** | |
1708 | * uart_parse_options - Parse serial port baud/parity/bits/flow contro. | |
1709 | * @options: pointer to option string | |
1710 | * @baud: pointer to an 'int' variable for the baud rate. | |
1711 | * @parity: pointer to an 'int' variable for the parity. | |
1712 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1713 | * @flow: pointer to an 'int' variable for the flow control character. | |
1714 | * | |
1715 | * uart_parse_options decodes a string containing the serial console | |
1716 | * options. The format of the string is <baud><parity><bits><flow>, | |
1717 | * eg: 115200n8r | |
1718 | */ | |
f2d937f3 | 1719 | void |
1da177e4 LT |
1720 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1721 | { | |
1722 | char *s = options; | |
1723 | ||
1724 | *baud = simple_strtoul(s, NULL, 10); | |
1725 | while (*s >= '0' && *s <= '9') | |
1726 | s++; | |
1727 | if (*s) | |
1728 | *parity = *s++; | |
1729 | if (*s) | |
1730 | *bits = *s++ - '0'; | |
1731 | if (*s) | |
1732 | *flow = *s; | |
1733 | } | |
f2d937f3 | 1734 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1735 | |
1736 | struct baud_rates { | |
1737 | unsigned int rate; | |
1738 | unsigned int cflag; | |
1739 | }; | |
1740 | ||
cb3592be | 1741 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1742 | { 921600, B921600 }, |
1743 | { 460800, B460800 }, | |
1744 | { 230400, B230400 }, | |
1745 | { 115200, B115200 }, | |
1746 | { 57600, B57600 }, | |
1747 | { 38400, B38400 }, | |
1748 | { 19200, B19200 }, | |
1749 | { 9600, B9600 }, | |
1750 | { 4800, B4800 }, | |
1751 | { 2400, B2400 }, | |
1752 | { 1200, B1200 }, | |
1753 | { 0, B38400 } | |
1754 | }; | |
1755 | ||
1756 | /** | |
1757 | * uart_set_options - setup the serial console parameters | |
1758 | * @port: pointer to the serial ports uart_port structure | |
1759 | * @co: console pointer | |
1760 | * @baud: baud rate | |
1761 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1762 | * @bits: number of data bits | |
1763 | * @flow: flow control character - 'r' (rts) | |
1764 | */ | |
f2d937f3 | 1765 | int |
1da177e4 LT |
1766 | uart_set_options(struct uart_port *port, struct console *co, |
1767 | int baud, int parity, int bits, int flow) | |
1768 | { | |
606d099c | 1769 | struct ktermios termios; |
149b36ea | 1770 | static struct ktermios dummy; |
1da177e4 LT |
1771 | int i; |
1772 | ||
976ecd12 RK |
1773 | /* |
1774 | * Ensure that the serial console lock is initialised | |
1775 | * early. | |
1776 | */ | |
1777 | spin_lock_init(&port->lock); | |
13e83599 | 1778 | lockdep_set_class(&port->lock, &port_lock_key); |
976ecd12 | 1779 | |
606d099c | 1780 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1781 | |
1782 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1783 | ||
1784 | /* | |
1785 | * Construct a cflag setting. | |
1786 | */ | |
1787 | for (i = 0; baud_rates[i].rate; i++) | |
1788 | if (baud_rates[i].rate <= baud) | |
1789 | break; | |
1790 | ||
1791 | termios.c_cflag |= baud_rates[i].cflag; | |
1792 | ||
1793 | if (bits == 7) | |
1794 | termios.c_cflag |= CS7; | |
1795 | else | |
1796 | termios.c_cflag |= CS8; | |
1797 | ||
1798 | switch (parity) { | |
1799 | case 'o': case 'O': | |
1800 | termios.c_cflag |= PARODD; | |
1801 | /*fall through*/ | |
1802 | case 'e': case 'E': | |
1803 | termios.c_cflag |= PARENB; | |
1804 | break; | |
1805 | } | |
1806 | ||
1807 | if (flow == 'r') | |
1808 | termios.c_cflag |= CRTSCTS; | |
1809 | ||
79492689 YL |
1810 | /* |
1811 | * some uarts on other side don't support no flow control. | |
1812 | * So we set * DTR in host uart to make them happy | |
1813 | */ | |
1814 | port->mctrl |= TIOCM_DTR; | |
1815 | ||
149b36ea | 1816 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1817 | /* |
1818 | * Allow the setting of the UART parameters with a NULL console | |
1819 | * too: | |
1820 | */ | |
1821 | if (co) | |
1822 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1823 | |
1824 | return 0; | |
1825 | } | |
f2d937f3 | 1826 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1827 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1828 | ||
cf75525f JS |
1829 | /** |
1830 | * uart_change_pm - set power state of the port | |
1831 | * | |
1832 | * @state: port descriptor | |
1833 | * @pm_state: new state | |
1834 | * | |
1835 | * Locking: port->mutex has to be held | |
1836 | */ | |
1da177e4 LT |
1837 | static void uart_change_pm(struct uart_state *state, int pm_state) |
1838 | { | |
ebd2c8f6 | 1839 | struct uart_port *port = state->uart_port; |
1281e360 AV |
1840 | |
1841 | if (state->pm_state != pm_state) { | |
1842 | if (port->ops->pm) | |
1843 | port->ops->pm(port, pm_state, state->pm_state); | |
1844 | state->pm_state = pm_state; | |
1845 | } | |
1da177e4 LT |
1846 | } |
1847 | ||
b3b708fa GL |
1848 | struct uart_match { |
1849 | struct uart_port *port; | |
1850 | struct uart_driver *driver; | |
1851 | }; | |
1852 | ||
1853 | static int serial_match_port(struct device *dev, void *data) | |
1854 | { | |
1855 | struct uart_match *match = data; | |
7ca796f4 GL |
1856 | struct tty_driver *tty_drv = match->driver->tty_driver; |
1857 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
1858 | match->port->line; | |
b3b708fa GL |
1859 | |
1860 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1861 | } | |
1862 | ||
ccce6deb | 1863 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1864 | { |
ccce6deb AC |
1865 | struct uart_state *state = drv->state + uport->line; |
1866 | struct tty_port *port = &state->port; | |
b3b708fa | 1867 | struct device *tty_dev; |
ccce6deb | 1868 | struct uart_match match = {uport, drv}; |
1da177e4 | 1869 | |
a2bceae0 | 1870 | mutex_lock(&port->mutex); |
1da177e4 | 1871 | |
ccce6deb | 1872 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
b3b708fa | 1873 | if (device_may_wakeup(tty_dev)) { |
3f960dbb G |
1874 | if (!enable_irq_wake(uport->irq)) |
1875 | uport->irq_wake = 1; | |
b3b708fa | 1876 | put_device(tty_dev); |
a2bceae0 | 1877 | mutex_unlock(&port->mutex); |
b3b708fa GL |
1878 | return 0; |
1879 | } | |
4547be78 SB |
1880 | if (console_suspend_enabled || !uart_console(uport)) |
1881 | uport->suspended = 1; | |
b3b708fa | 1882 | |
ccce6deb AC |
1883 | if (port->flags & ASYNC_INITIALIZED) { |
1884 | const struct uart_ops *ops = uport->ops; | |
c8c6bfa3 | 1885 | int tries; |
1da177e4 | 1886 | |
4547be78 SB |
1887 | if (console_suspend_enabled || !uart_console(uport)) { |
1888 | set_bit(ASYNCB_SUSPENDED, &port->flags); | |
1889 | clear_bit(ASYNCB_INITIALIZED, &port->flags); | |
a6b93a90 | 1890 | |
4547be78 SB |
1891 | spin_lock_irq(&uport->lock); |
1892 | ops->stop_tx(uport); | |
1893 | ops->set_mctrl(uport, 0); | |
1894 | ops->stop_rx(uport); | |
1895 | spin_unlock_irq(&uport->lock); | |
1896 | } | |
1da177e4 LT |
1897 | |
1898 | /* | |
1899 | * Wait for the transmitter to empty. | |
1900 | */ | |
ccce6deb | 1901 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
1da177e4 | 1902 | msleep(10); |
c8c6bfa3 | 1903 | if (!tries) |
a46c9994 AC |
1904 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
1905 | "transmitter\n", | |
ccce6deb AC |
1906 | uport->dev ? dev_name(uport->dev) : "", |
1907 | uport->dev ? ": " : "", | |
8440838b | 1908 | drv->dev_name, |
ccce6deb | 1909 | drv->tty_driver->name_base + uport->line); |
1da177e4 | 1910 | |
4547be78 SB |
1911 | if (console_suspend_enabled || !uart_console(uport)) |
1912 | ops->shutdown(uport); | |
1da177e4 LT |
1913 | } |
1914 | ||
1915 | /* | |
1916 | * Disable the console device before suspending. | |
1917 | */ | |
4547be78 | 1918 | if (console_suspend_enabled && uart_console(uport)) |
ccce6deb | 1919 | console_stop(uport->cons); |
1da177e4 | 1920 | |
4547be78 SB |
1921 | if (console_suspend_enabled || !uart_console(uport)) |
1922 | uart_change_pm(state, 3); | |
1da177e4 | 1923 | |
a2bceae0 | 1924 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1925 | |
1926 | return 0; | |
1927 | } | |
1928 | ||
ccce6deb | 1929 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1930 | { |
ccce6deb AC |
1931 | struct uart_state *state = drv->state + uport->line; |
1932 | struct tty_port *port = &state->port; | |
03a74dcc | 1933 | struct device *tty_dev; |
ccce6deb | 1934 | struct uart_match match = {uport, drv}; |
ba15ab0e | 1935 | struct ktermios termios; |
1da177e4 | 1936 | |
a2bceae0 | 1937 | mutex_lock(&port->mutex); |
1da177e4 | 1938 | |
ccce6deb AC |
1939 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
1940 | if (!uport->suspended && device_may_wakeup(tty_dev)) { | |
3f960dbb G |
1941 | if (uport->irq_wake) { |
1942 | disable_irq_wake(uport->irq); | |
1943 | uport->irq_wake = 0; | |
1944 | } | |
a2bceae0 | 1945 | mutex_unlock(&port->mutex); |
b3b708fa GL |
1946 | return 0; |
1947 | } | |
ccce6deb | 1948 | uport->suspended = 0; |
b3b708fa | 1949 | |
1da177e4 LT |
1950 | /* |
1951 | * Re-enable the console device after suspending. | |
1952 | */ | |
5933a161 | 1953 | if (uart_console(uport)) { |
891b9dd1 JW |
1954 | /* |
1955 | * First try to use the console cflag setting. | |
1956 | */ | |
1957 | memset(&termios, 0, sizeof(struct ktermios)); | |
1958 | termios.c_cflag = uport->cons->cflag; | |
1959 | ||
1960 | /* | |
1961 | * If that's unset, use the tty termios setting. | |
1962 | */ | |
1963 | if (port->tty && port->tty->termios && termios.c_cflag == 0) | |
1964 | termios = *(port->tty->termios); | |
1965 | ||
94abc56f NJ |
1966 | if (console_suspend_enabled) |
1967 | uart_change_pm(state, 0); | |
ccce6deb | 1968 | uport->ops->set_termios(uport, &termios, NULL); |
5933a161 YK |
1969 | if (console_suspend_enabled) |
1970 | console_start(uport->cons); | |
1da177e4 LT |
1971 | } |
1972 | ||
ccce6deb AC |
1973 | if (port->flags & ASYNC_SUSPENDED) { |
1974 | const struct uart_ops *ops = uport->ops; | |
ee31b337 | 1975 | int ret; |
1da177e4 | 1976 | |
9d778a69 | 1977 | uart_change_pm(state, 0); |
ccce6deb AC |
1978 | spin_lock_irq(&uport->lock); |
1979 | ops->set_mctrl(uport, 0); | |
1980 | spin_unlock_irq(&uport->lock); | |
4547be78 | 1981 | if (console_suspend_enabled || !uart_console(uport)) { |
19225135 AC |
1982 | /* Protected by port mutex for now */ |
1983 | struct tty_struct *tty = port->tty; | |
4547be78 SB |
1984 | ret = ops->startup(uport); |
1985 | if (ret == 0) { | |
19225135 AC |
1986 | if (tty) |
1987 | uart_change_speed(tty, state, NULL); | |
4547be78 SB |
1988 | spin_lock_irq(&uport->lock); |
1989 | ops->set_mctrl(uport, uport->mctrl); | |
1990 | ops->start_tx(uport); | |
1991 | spin_unlock_irq(&uport->lock); | |
1992 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
1993 | } else { | |
1994 | /* | |
1995 | * Failed to resume - maybe hardware went away? | |
1996 | * Clear the "initialized" flag so we won't try | |
1997 | * to call the low level drivers shutdown method. | |
1998 | */ | |
19225135 | 1999 | uart_shutdown(tty, state); |
4547be78 | 2000 | } |
ee31b337 | 2001 | } |
a6b93a90 | 2002 | |
ccce6deb | 2003 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
2004 | } |
2005 | ||
a2bceae0 | 2006 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2007 | |
2008 | return 0; | |
2009 | } | |
2010 | ||
2011 | static inline void | |
2012 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2013 | { | |
30b7a3bc RK |
2014 | char address[64]; |
2015 | ||
1da177e4 LT |
2016 | switch (port->iotype) { |
2017 | case UPIO_PORT: | |
9bde10a4 | 2018 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2019 | break; |
2020 | case UPIO_HUB6: | |
30b7a3bc | 2021 | snprintf(address, sizeof(address), |
9bde10a4 | 2022 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2023 | break; |
2024 | case UPIO_MEM: | |
2025 | case UPIO_MEM32: | |
21c614a7 | 2026 | case UPIO_AU: |
3be91ec7 | 2027 | case UPIO_TSI: |
30b7a3bc | 2028 | snprintf(address, sizeof(address), |
4f640efb | 2029 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2030 | break; |
2031 | default: | |
2032 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2033 | break; |
2034 | } | |
30b7a3bc | 2035 | |
0cf669d5 | 2036 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", |
4bfe090b | 2037 | port->dev ? dev_name(port->dev) : "", |
0cf669d5 | 2038 | port->dev ? ": " : "", |
8440838b DM |
2039 | drv->dev_name, |
2040 | drv->tty_driver->name_base + port->line, | |
2041 | address, port->irq, uart_type(port)); | |
1da177e4 LT |
2042 | } |
2043 | ||
2044 | static void | |
2045 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2046 | struct uart_port *port) | |
2047 | { | |
2048 | unsigned int flags; | |
2049 | ||
2050 | /* | |
2051 | * If there isn't a port here, don't do anything further. | |
2052 | */ | |
2053 | if (!port->iobase && !port->mapbase && !port->membase) | |
2054 | return; | |
2055 | ||
2056 | /* | |
2057 | * Now do the auto configuration stuff. Note that config_port | |
2058 | * is expected to claim the resources and map the port for us. | |
2059 | */ | |
8e23fcc8 | 2060 | flags = 0; |
1da177e4 LT |
2061 | if (port->flags & UPF_AUTO_IRQ) |
2062 | flags |= UART_CONFIG_IRQ; | |
2063 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2064 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2065 | port->type = PORT_UNKNOWN; | |
2066 | flags |= UART_CONFIG_TYPE; | |
2067 | } | |
1da177e4 LT |
2068 | port->ops->config_port(port, flags); |
2069 | } | |
2070 | ||
2071 | if (port->type != PORT_UNKNOWN) { | |
2072 | unsigned long flags; | |
2073 | ||
2074 | uart_report_port(drv, port); | |
2075 | ||
3689a0ec GD |
2076 | /* Power up port for set_mctrl() */ |
2077 | uart_change_pm(state, 0); | |
2078 | ||
1da177e4 LT |
2079 | /* |
2080 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2081 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2082 | * We probably don't need a spinlock around this, but |
2083 | */ | |
2084 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2085 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2086 | spin_unlock_irqrestore(&port->lock, flags); |
2087 | ||
97d97224 RK |
2088 | /* |
2089 | * If this driver supports console, and it hasn't been | |
2090 | * successfully registered yet, try to re-register it. | |
2091 | * It may be that the port was not available. | |
2092 | */ | |
2093 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2094 | register_console(port->cons); | |
2095 | ||
1da177e4 LT |
2096 | /* |
2097 | * Power down all ports by default, except the | |
2098 | * console if we have one. | |
2099 | */ | |
2100 | if (!uart_console(port)) | |
2101 | uart_change_pm(state, 3); | |
2102 | } | |
2103 | } | |
2104 | ||
f2d937f3 JW |
2105 | #ifdef CONFIG_CONSOLE_POLL |
2106 | ||
2107 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2108 | { | |
2109 | struct uart_driver *drv = driver->driver_state; | |
2110 | struct uart_state *state = drv->state + line; | |
2111 | struct uart_port *port; | |
2112 | int baud = 9600; | |
2113 | int bits = 8; | |
2114 | int parity = 'n'; | |
2115 | int flow = 'n'; | |
2116 | ||
ebd2c8f6 | 2117 | if (!state || !state->uart_port) |
f2d937f3 JW |
2118 | return -1; |
2119 | ||
ebd2c8f6 | 2120 | port = state->uart_port; |
f2d937f3 JW |
2121 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
2122 | return -1; | |
2123 | ||
2124 | if (options) { | |
2125 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2126 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2127 | } | |
2128 | ||
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2133 | { | |
2134 | struct uart_driver *drv = driver->driver_state; | |
2135 | struct uart_state *state = drv->state + line; | |
2136 | struct uart_port *port; | |
2137 | ||
ebd2c8f6 | 2138 | if (!state || !state->uart_port) |
f2d937f3 JW |
2139 | return -1; |
2140 | ||
ebd2c8f6 | 2141 | port = state->uart_port; |
f2d937f3 JW |
2142 | return port->ops->poll_get_char(port); |
2143 | } | |
2144 | ||
2145 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2146 | { | |
2147 | struct uart_driver *drv = driver->driver_state; | |
2148 | struct uart_state *state = drv->state + line; | |
2149 | struct uart_port *port; | |
2150 | ||
ebd2c8f6 | 2151 | if (!state || !state->uart_port) |
f2d937f3 JW |
2152 | return; |
2153 | ||
ebd2c8f6 | 2154 | port = state->uart_port; |
f2d937f3 JW |
2155 | port->ops->poll_put_char(port, ch); |
2156 | } | |
2157 | #endif | |
2158 | ||
b68e31d0 | 2159 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2160 | .open = uart_open, |
2161 | .close = uart_close, | |
2162 | .write = uart_write, | |
2163 | .put_char = uart_put_char, | |
2164 | .flush_chars = uart_flush_chars, | |
2165 | .write_room = uart_write_room, | |
2166 | .chars_in_buffer= uart_chars_in_buffer, | |
2167 | .flush_buffer = uart_flush_buffer, | |
2168 | .ioctl = uart_ioctl, | |
2169 | .throttle = uart_throttle, | |
2170 | .unthrottle = uart_unthrottle, | |
2171 | .send_xchar = uart_send_xchar, | |
2172 | .set_termios = uart_set_termios, | |
64e9159f | 2173 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2174 | .stop = uart_stop, |
2175 | .start = uart_start, | |
2176 | .hangup = uart_hangup, | |
2177 | .break_ctl = uart_break_ctl, | |
2178 | .wait_until_sent= uart_wait_until_sent, | |
2179 | #ifdef CONFIG_PROC_FS | |
d196a949 | 2180 | .proc_fops = &uart_proc_fops, |
1da177e4 LT |
2181 | #endif |
2182 | .tiocmget = uart_tiocmget, | |
2183 | .tiocmset = uart_tiocmset, | |
d281da7f | 2184 | .get_icount = uart_get_icount, |
f2d937f3 JW |
2185 | #ifdef CONFIG_CONSOLE_POLL |
2186 | .poll_init = uart_poll_init, | |
2187 | .poll_get_char = uart_poll_get_char, | |
2188 | .poll_put_char = uart_poll_put_char, | |
2189 | #endif | |
1da177e4 LT |
2190 | }; |
2191 | ||
de0c8cb3 | 2192 | static const struct tty_port_operations uart_port_ops = { |
0b1db830 JS |
2193 | .activate = uart_port_activate, |
2194 | .shutdown = uart_port_shutdown, | |
de0c8cb3 AC |
2195 | .carrier_raised = uart_carrier_raised, |
2196 | .dtr_rts = uart_dtr_rts, | |
2197 | }; | |
2198 | ||
1da177e4 LT |
2199 | /** |
2200 | * uart_register_driver - register a driver with the uart core layer | |
2201 | * @drv: low level driver structure | |
2202 | * | |
2203 | * Register a uart driver with the core driver. We in turn register | |
2204 | * with the tty layer, and initialise the core driver per-port state. | |
2205 | * | |
2206 | * We have a proc file in /proc/tty/driver which is named after the | |
2207 | * normal driver. | |
2208 | * | |
2209 | * drv->port should be NULL, and the per-port structures should be | |
2210 | * registered using uart_add_one_port after this call has succeeded. | |
2211 | */ | |
2212 | int uart_register_driver(struct uart_driver *drv) | |
2213 | { | |
9e845abf | 2214 | struct tty_driver *normal; |
1da177e4 LT |
2215 | int i, retval; |
2216 | ||
2217 | BUG_ON(drv->state); | |
2218 | ||
2219 | /* | |
2220 | * Maybe we should be using a slab cache for this, especially if | |
2221 | * we have a large number of ports to handle. | |
2222 | */ | |
8f31bb39 | 2223 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2224 | if (!drv->state) |
2225 | goto out; | |
2226 | ||
9e845abf | 2227 | normal = alloc_tty_driver(drv->nr); |
1da177e4 | 2228 | if (!normal) |
9e845abf | 2229 | goto out_kfree; |
1da177e4 LT |
2230 | |
2231 | drv->tty_driver = normal; | |
2232 | ||
1da177e4 | 2233 | normal->driver_name = drv->driver_name; |
1da177e4 LT |
2234 | normal->name = drv->dev_name; |
2235 | normal->major = drv->major; | |
2236 | normal->minor_start = drv->minor; | |
2237 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2238 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2239 | normal->init_termios = tty_std_termios; | |
2240 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2241 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2242 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2243 | normal->driver_state = drv; |
2244 | tty_set_operations(normal, &uart_ops); | |
2245 | ||
2246 | /* | |
2247 | * Initialise the UART state(s). | |
2248 | */ | |
2249 | for (i = 0; i < drv->nr; i++) { | |
2250 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 2251 | struct tty_port *port = &state->port; |
1da177e4 | 2252 | |
a2bceae0 | 2253 | tty_port_init(port); |
de0c8cb3 | 2254 | port->ops = &uart_port_ops; |
4cb0fbfd JS |
2255 | port->close_delay = HZ / 2; /* .5 seconds */ |
2256 | port->closing_wait = 30 * HZ;/* 30 seconds */ | |
1da177e4 LT |
2257 | } |
2258 | ||
2259 | retval = tty_register_driver(normal); | |
9e845abf AGR |
2260 | if (retval >= 0) |
2261 | return retval; | |
2262 | ||
2263 | put_tty_driver(normal); | |
2264 | out_kfree: | |
2265 | kfree(drv->state); | |
2266 | out: | |
2267 | return -ENOMEM; | |
1da177e4 LT |
2268 | } |
2269 | ||
2270 | /** | |
2271 | * uart_unregister_driver - remove a driver from the uart core layer | |
2272 | * @drv: low level driver structure | |
2273 | * | |
2274 | * Remove all references to a driver from the core driver. The low | |
2275 | * level driver must have removed all its ports via the | |
2276 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2277 | * (ie, drv->port == NULL) | |
2278 | */ | |
2279 | void uart_unregister_driver(struct uart_driver *drv) | |
2280 | { | |
2281 | struct tty_driver *p = drv->tty_driver; | |
2282 | tty_unregister_driver(p); | |
2283 | put_tty_driver(p); | |
2284 | kfree(drv->state); | |
1e66cded | 2285 | drv->state = NULL; |
1da177e4 LT |
2286 | drv->tty_driver = NULL; |
2287 | } | |
2288 | ||
2289 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2290 | { | |
2291 | struct uart_driver *p = co->data; | |
2292 | *index = co->index; | |
2293 | return p->tty_driver; | |
2294 | } | |
2295 | ||
2296 | /** | |
2297 | * uart_add_one_port - attach a driver-defined port structure | |
2298 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2299 | * @uport: uart port structure to use for this port. |
1da177e4 LT |
2300 | * |
2301 | * This allows the driver to register its own uart_port structure | |
2302 | * with the core driver. The main purpose is to allow the low | |
2303 | * level uart drivers to expand uart_port, rather than having yet | |
2304 | * more levels of structures. | |
2305 | */ | |
a2bceae0 | 2306 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 LT |
2307 | { |
2308 | struct uart_state *state; | |
a2bceae0 | 2309 | struct tty_port *port; |
1da177e4 | 2310 | int ret = 0; |
b3b708fa | 2311 | struct device *tty_dev; |
1da177e4 LT |
2312 | |
2313 | BUG_ON(in_interrupt()); | |
2314 | ||
a2bceae0 | 2315 | if (uport->line >= drv->nr) |
1da177e4 LT |
2316 | return -EINVAL; |
2317 | ||
a2bceae0 AC |
2318 | state = drv->state + uport->line; |
2319 | port = &state->port; | |
1da177e4 | 2320 | |
f392ecfa | 2321 | mutex_lock(&port_mutex); |
a2bceae0 | 2322 | mutex_lock(&port->mutex); |
ebd2c8f6 | 2323 | if (state->uart_port) { |
1da177e4 LT |
2324 | ret = -EINVAL; |
2325 | goto out; | |
2326 | } | |
2327 | ||
a2bceae0 | 2328 | state->uart_port = uport; |
97d97224 | 2329 | state->pm_state = -1; |
1da177e4 | 2330 | |
a2bceae0 AC |
2331 | uport->cons = drv->cons; |
2332 | uport->state = state; | |
1da177e4 | 2333 | |
976ecd12 RK |
2334 | /* |
2335 | * If this port is a console, then the spinlock is already | |
2336 | * initialised. | |
2337 | */ | |
a2bceae0 AC |
2338 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
2339 | spin_lock_init(&uport->lock); | |
2340 | lockdep_set_class(&uport->lock, &port_lock_key); | |
13e83599 | 2341 | } |
976ecd12 | 2342 | |
a2bceae0 | 2343 | uart_configure_port(drv, state, uport); |
1da177e4 LT |
2344 | |
2345 | /* | |
2346 | * Register the port whether it's detected or not. This allows | |
2347 | * setserial to be used to alter this ports parameters. | |
2348 | */ | |
a2bceae0 | 2349 | tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev); |
b3b708fa | 2350 | if (likely(!IS_ERR(tty_dev))) { |
77359835 SG |
2351 | device_set_wakeup_capable(tty_dev, 1); |
2352 | } else { | |
b3b708fa | 2353 | printk(KERN_ERR "Cannot register tty device on line %d\n", |
a2bceae0 | 2354 | uport->line); |
77359835 | 2355 | } |
1da177e4 | 2356 | |
68ac64cd RK |
2357 | /* |
2358 | * Ensure UPF_DEAD is not set. | |
2359 | */ | |
a2bceae0 | 2360 | uport->flags &= ~UPF_DEAD; |
68ac64cd | 2361 | |
1da177e4 | 2362 | out: |
a2bceae0 | 2363 | mutex_unlock(&port->mutex); |
f392ecfa | 2364 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2365 | |
2366 | return ret; | |
2367 | } | |
2368 | ||
2369 | /** | |
2370 | * uart_remove_one_port - detach a driver defined port structure | |
2371 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2372 | * @uport: uart port structure for this port |
1da177e4 LT |
2373 | * |
2374 | * This unhooks (and hangs up) the specified port structure from the | |
2375 | * core driver. No further calls will be made to the low-level code | |
2376 | * for this port. | |
2377 | */ | |
a2bceae0 | 2378 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2379 | { |
a2bceae0 AC |
2380 | struct uart_state *state = drv->state + uport->line; |
2381 | struct tty_port *port = &state->port; | |
1da177e4 LT |
2382 | |
2383 | BUG_ON(in_interrupt()); | |
2384 | ||
a2bceae0 | 2385 | if (state->uart_port != uport) |
1da177e4 | 2386 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
a2bceae0 | 2387 | state->uart_port, uport); |
1da177e4 | 2388 | |
f392ecfa | 2389 | mutex_lock(&port_mutex); |
1da177e4 | 2390 | |
68ac64cd RK |
2391 | /* |
2392 | * Mark the port "dead" - this prevents any opens from | |
2393 | * succeeding while we shut down the port. | |
2394 | */ | |
a2bceae0 AC |
2395 | mutex_lock(&port->mutex); |
2396 | uport->flags |= UPF_DEAD; | |
2397 | mutex_unlock(&port->mutex); | |
68ac64cd | 2398 | |
1da177e4 | 2399 | /* |
aa4148cf | 2400 | * Remove the devices from the tty layer |
1da177e4 | 2401 | */ |
a2bceae0 | 2402 | tty_unregister_device(drv->tty_driver, uport->line); |
1da177e4 | 2403 | |
a2bceae0 AC |
2404 | if (port->tty) |
2405 | tty_vhangup(port->tty); | |
68ac64cd | 2406 | |
68ac64cd RK |
2407 | /* |
2408 | * Free the port IO and memory resources, if any. | |
2409 | */ | |
a2bceae0 AC |
2410 | if (uport->type != PORT_UNKNOWN) |
2411 | uport->ops->release_port(uport); | |
68ac64cd RK |
2412 | |
2413 | /* | |
2414 | * Indicate that there isn't a port here anymore. | |
2415 | */ | |
a2bceae0 | 2416 | uport->type = PORT_UNKNOWN; |
68ac64cd | 2417 | |
ebd2c8f6 | 2418 | state->uart_port = NULL; |
f392ecfa | 2419 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2420 | |
2421 | return 0; | |
2422 | } | |
2423 | ||
2424 | /* | |
2425 | * Are the two ports equivalent? | |
2426 | */ | |
2427 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2428 | { | |
2429 | if (port1->iotype != port2->iotype) | |
2430 | return 0; | |
2431 | ||
2432 | switch (port1->iotype) { | |
2433 | case UPIO_PORT: | |
2434 | return (port1->iobase == port2->iobase); | |
2435 | case UPIO_HUB6: | |
2436 | return (port1->iobase == port2->iobase) && | |
2437 | (port1->hub6 == port2->hub6); | |
2438 | case UPIO_MEM: | |
d21b55d3 SS |
2439 | case UPIO_MEM32: |
2440 | case UPIO_AU: | |
2441 | case UPIO_TSI: | |
1624f003 | 2442 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2443 | } |
2444 | return 0; | |
2445 | } | |
2446 | EXPORT_SYMBOL(uart_match_port); | |
2447 | ||
027d7dac JS |
2448 | /** |
2449 | * uart_handle_dcd_change - handle a change of carrier detect state | |
2450 | * @uport: uart_port structure for the open port | |
2451 | * @status: new carrier detect status, nonzero if active | |
2452 | */ | |
2453 | void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) | |
2454 | { | |
2455 | struct uart_state *state = uport->state; | |
2456 | struct tty_port *port = &state->port; | |
2457 | struct tty_ldisc *ld = tty_ldisc_ref(port->tty); | |
2458 | struct pps_event_time ts; | |
2459 | ||
2460 | if (ld && ld->ops->dcd_change) | |
2461 | pps_get_ts(&ts); | |
2462 | ||
2463 | uport->icount.dcd++; | |
2464 | #ifdef CONFIG_HARD_PPS | |
2465 | if ((uport->flags & UPF_HARDPPS_CD) && status) | |
2466 | hardpps(); | |
2467 | #endif | |
2468 | ||
2469 | if (port->flags & ASYNC_CHECK_CD) { | |
2470 | if (status) | |
2471 | wake_up_interruptible(&port->open_wait); | |
2472 | else if (port->tty) | |
2473 | tty_hangup(port->tty); | |
2474 | } | |
2475 | ||
2476 | if (ld && ld->ops->dcd_change) | |
2477 | ld->ops->dcd_change(port->tty, status, &ts); | |
2478 | if (ld) | |
2479 | tty_ldisc_deref(ld); | |
2480 | } | |
2481 | EXPORT_SYMBOL_GPL(uart_handle_dcd_change); | |
2482 | ||
2483 | /** | |
2484 | * uart_handle_cts_change - handle a change of clear-to-send state | |
2485 | * @uport: uart_port structure for the open port | |
2486 | * @status: new clear to send status, nonzero if active | |
2487 | */ | |
2488 | void uart_handle_cts_change(struct uart_port *uport, unsigned int status) | |
2489 | { | |
2490 | struct tty_port *port = &uport->state->port; | |
2491 | struct tty_struct *tty = port->tty; | |
2492 | ||
2493 | uport->icount.cts++; | |
2494 | ||
2495 | if (port->flags & ASYNC_CTS_FLOW) { | |
2496 | if (tty->hw_stopped) { | |
2497 | if (status) { | |
2498 | tty->hw_stopped = 0; | |
2499 | uport->ops->start_tx(uport); | |
2500 | uart_write_wakeup(uport); | |
2501 | } | |
2502 | } else { | |
2503 | if (!status) { | |
2504 | tty->hw_stopped = 1; | |
2505 | uport->ops->stop_tx(uport); | |
2506 | } | |
2507 | } | |
2508 | } | |
2509 | } | |
2510 | EXPORT_SYMBOL_GPL(uart_handle_cts_change); | |
2511 | ||
cf75525f JS |
2512 | /** |
2513 | * uart_insert_char - push a char to the uart layer | |
2514 | * | |
2515 | * User is responsible to call tty_flip_buffer_push when they are done with | |
2516 | * insertion. | |
2517 | * | |
2518 | * @port: corresponding port | |
2519 | * @status: state of the serial port RX buffer (LSR for 8250) | |
2520 | * @overrun: mask of overrun bits in @status | |
2521 | * @ch: character to push | |
2522 | * @flag: flag for the character (see TTY_NORMAL and friends) | |
2523 | */ | |
027d7dac JS |
2524 | void uart_insert_char(struct uart_port *port, unsigned int status, |
2525 | unsigned int overrun, unsigned int ch, unsigned int flag) | |
2526 | { | |
2527 | struct tty_struct *tty = port->state->port.tty; | |
2528 | ||
2529 | if ((status & port->ignore_status_mask & ~overrun) == 0) | |
dabfb351 C |
2530 | if (tty_insert_flip_char(tty, ch, flag) == 0) |
2531 | ++port->icount.buf_overrun; | |
027d7dac JS |
2532 | |
2533 | /* | |
2534 | * Overrun is special. Since it's reported immediately, | |
2535 | * it doesn't affect the current character. | |
2536 | */ | |
2537 | if (status & ~port->ignore_status_mask & overrun) | |
dabfb351 C |
2538 | if (tty_insert_flip_char(tty, 0, TTY_OVERRUN) == 0) |
2539 | ++port->icount.buf_overrun; | |
027d7dac JS |
2540 | } |
2541 | EXPORT_SYMBOL_GPL(uart_insert_char); | |
2542 | ||
1da177e4 LT |
2543 | EXPORT_SYMBOL(uart_write_wakeup); |
2544 | EXPORT_SYMBOL(uart_register_driver); | |
2545 | EXPORT_SYMBOL(uart_unregister_driver); | |
2546 | EXPORT_SYMBOL(uart_suspend_port); | |
2547 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2548 | EXPORT_SYMBOL(uart_add_one_port); |
2549 | EXPORT_SYMBOL(uart_remove_one_port); | |
2550 | ||
2551 | MODULE_DESCRIPTION("Serial driver core"); | |
2552 | MODULE_LICENSE("GPL"); |