Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/char/core.c | |
3 | * | |
4 | * Driver core for serial ports | |
5 | * | |
6 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
7 | * | |
8 | * Copyright 1999 ARM Limited | |
9 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | */ | |
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/tty.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/console.h> | |
d196a949 AD |
30 | #include <linux/proc_fs.h> |
31 | #include <linux/seq_file.h> | |
1da177e4 LT |
32 | #include <linux/device.h> |
33 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ | |
ccce6deb | 34 | #include <linux/serial_core.h> |
1da177e4 | 35 | #include <linux/delay.h> |
f392ecfa | 36 | #include <linux/mutex.h> |
1da177e4 LT |
37 | |
38 | #include <asm/irq.h> | |
39 | #include <asm/uaccess.h> | |
40 | ||
1da177e4 LT |
41 | /* |
42 | * This is used to lock changes in serial line configuration. | |
43 | */ | |
f392ecfa | 44 | static DEFINE_MUTEX(port_mutex); |
1da177e4 | 45 | |
13e83599 IM |
46 | /* |
47 | * lockdep: port->lock is initialized in two places, but we | |
48 | * want only one lock-class: | |
49 | */ | |
50 | static struct lock_class_key port_lock_key; | |
51 | ||
1da177e4 LT |
52 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
53 | ||
1da177e4 LT |
54 | #ifdef CONFIG_SERIAL_CORE_CONSOLE |
55 | #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) | |
56 | #else | |
57 | #define uart_console(port) (0) | |
58 | #endif | |
59 | ||
19225135 | 60 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
a46c9994 | 61 | struct ktermios *old_termios); |
20365219 | 62 | static void __uart_wait_until_sent(struct uart_port *port, int timeout); |
1da177e4 LT |
63 | static void uart_change_pm(struct uart_state *state, int pm_state); |
64 | ||
65 | /* | |
66 | * This routine is used by the interrupt handler to schedule processing in | |
67 | * the software interrupt portion of the driver. | |
68 | */ | |
69 | void uart_write_wakeup(struct uart_port *port) | |
70 | { | |
ebd2c8f6 | 71 | struct uart_state *state = port->state; |
d5f735e5 PM |
72 | /* |
73 | * This means you called this function _after_ the port was | |
74 | * closed. No cookie for you. | |
75 | */ | |
ebd2c8f6 AC |
76 | BUG_ON(!state); |
77 | tasklet_schedule(&state->tlet); | |
1da177e4 LT |
78 | } |
79 | ||
80 | static void uart_stop(struct tty_struct *tty) | |
81 | { | |
82 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 83 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
84 | unsigned long flags; |
85 | ||
86 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 87 | port->ops->stop_tx(port); |
1da177e4 LT |
88 | spin_unlock_irqrestore(&port->lock, flags); |
89 | } | |
90 | ||
91 | static void __uart_start(struct tty_struct *tty) | |
92 | { | |
93 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 94 | struct uart_port *port = state->uart_port; |
1da177e4 | 95 | |
ebd2c8f6 | 96 | if (!uart_circ_empty(&state->xmit) && state->xmit.buf && |
1da177e4 | 97 | !tty->stopped && !tty->hw_stopped) |
b129a8cc | 98 | port->ops->start_tx(port); |
1da177e4 LT |
99 | } |
100 | ||
101 | static void uart_start(struct tty_struct *tty) | |
102 | { | |
103 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 104 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
105 | unsigned long flags; |
106 | ||
107 | spin_lock_irqsave(&port->lock, flags); | |
108 | __uart_start(tty); | |
109 | spin_unlock_irqrestore(&port->lock, flags); | |
110 | } | |
111 | ||
112 | static void uart_tasklet_action(unsigned long data) | |
113 | { | |
114 | struct uart_state *state = (struct uart_state *)data; | |
ebd2c8f6 | 115 | tty_wakeup(state->port.tty); |
1da177e4 LT |
116 | } |
117 | ||
118 | static inline void | |
119 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) | |
120 | { | |
121 | unsigned long flags; | |
122 | unsigned int old; | |
123 | ||
124 | spin_lock_irqsave(&port->lock, flags); | |
125 | old = port->mctrl; | |
126 | port->mctrl = (old & ~clear) | set; | |
127 | if (old != port->mctrl) | |
128 | port->ops->set_mctrl(port, port->mctrl); | |
129 | spin_unlock_irqrestore(&port->lock, flags); | |
130 | } | |
131 | ||
a46c9994 AC |
132 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
133 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) | |
1da177e4 LT |
134 | |
135 | /* | |
136 | * Startup the port. This will be called once per open. All calls | |
df4f4dd4 | 137 | * will be serialised by the per-port mutex. |
1da177e4 | 138 | */ |
19225135 | 139 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, int init_hw) |
1da177e4 | 140 | { |
46d57a44 AC |
141 | struct uart_port *uport = state->uart_port; |
142 | struct tty_port *port = &state->port; | |
1da177e4 LT |
143 | unsigned long page; |
144 | int retval = 0; | |
145 | ||
ccce6deb | 146 | if (port->flags & ASYNC_INITIALIZED) |
1da177e4 LT |
147 | return 0; |
148 | ||
149 | /* | |
150 | * Set the TTY IO error marker - we will only clear this | |
151 | * once we have successfully opened the port. Also set | |
152 | * up the tty->alt_speed kludge | |
153 | */ | |
19225135 | 154 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 | 155 | |
46d57a44 | 156 | if (uport->type == PORT_UNKNOWN) |
1da177e4 LT |
157 | return 0; |
158 | ||
159 | /* | |
160 | * Initialise and allocate the transmit and temporary | |
161 | * buffer. | |
162 | */ | |
ebd2c8f6 | 163 | if (!state->xmit.buf) { |
df4f4dd4 | 164 | /* This is protected by the per port mutex */ |
1da177e4 LT |
165 | page = get_zeroed_page(GFP_KERNEL); |
166 | if (!page) | |
167 | return -ENOMEM; | |
168 | ||
ebd2c8f6 AC |
169 | state->xmit.buf = (unsigned char *) page; |
170 | uart_circ_clear(&state->xmit); | |
1da177e4 LT |
171 | } |
172 | ||
46d57a44 | 173 | retval = uport->ops->startup(uport); |
1da177e4 LT |
174 | if (retval == 0) { |
175 | if (init_hw) { | |
176 | /* | |
177 | * Initialise the hardware port settings. | |
178 | */ | |
19225135 | 179 | uart_change_speed(tty, state, NULL); |
1da177e4 LT |
180 | |
181 | /* | |
182 | * Setup the RTS and DTR signals once the | |
183 | * port is open and ready to respond. | |
184 | */ | |
19225135 | 185 | if (tty->termios->c_cflag & CBAUD) |
46d57a44 | 186 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 LT |
187 | } |
188 | ||
ccce6deb | 189 | if (port->flags & ASYNC_CTS_FLOW) { |
46d57a44 AC |
190 | spin_lock_irq(&uport->lock); |
191 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) | |
19225135 | 192 | tty->hw_stopped = 1; |
46d57a44 | 193 | spin_unlock_irq(&uport->lock); |
0dd7a1ae RK |
194 | } |
195 | ||
ccce6deb | 196 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
1da177e4 | 197 | |
19225135 | 198 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
199 | } |
200 | ||
201 | if (retval && capable(CAP_SYS_ADMIN)) | |
202 | retval = 0; | |
203 | ||
204 | return retval; | |
205 | } | |
206 | ||
207 | /* | |
208 | * This routine will shutdown a serial port; interrupts are disabled, and | |
209 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
210 | * uart_shutdown are serialised by the per-port semaphore. | |
211 | */ | |
19225135 | 212 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
1da177e4 | 213 | { |
ccce6deb | 214 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 215 | struct tty_port *port = &state->port; |
1da177e4 | 216 | |
1da177e4 | 217 | /* |
ee31b337 | 218 | * Set the TTY IO error marker |
1da177e4 | 219 | */ |
f751928e AC |
220 | if (tty) |
221 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 222 | |
bdc04e31 | 223 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
ee31b337 RK |
224 | /* |
225 | * Turn off DTR and RTS early. | |
226 | */ | |
f751928e | 227 | if (!tty || (tty->termios->c_cflag & HUPCL)) |
ccce6deb | 228 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
ee31b337 RK |
229 | |
230 | /* | |
231 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
232 | * the irq here so the queue might never be woken up. Note | |
233 | * that we won't end up waiting on delta_msr_wait again since | |
234 | * any outstanding file descriptors should be pointing at | |
235 | * hung_up_tty_fops now. | |
236 | */ | |
bdc04e31 | 237 | wake_up_interruptible(&port->delta_msr_wait); |
ee31b337 RK |
238 | |
239 | /* | |
240 | * Free the IRQ and disable the port. | |
241 | */ | |
ccce6deb | 242 | uport->ops->shutdown(uport); |
ee31b337 RK |
243 | |
244 | /* | |
245 | * Ensure that the IRQ handler isn't running on another CPU. | |
246 | */ | |
ccce6deb | 247 | synchronize_irq(uport->irq); |
ee31b337 | 248 | } |
1da177e4 LT |
249 | |
250 | /* | |
ee31b337 | 251 | * kill off our tasklet |
1da177e4 | 252 | */ |
ebd2c8f6 | 253 | tasklet_kill(&state->tlet); |
1da177e4 LT |
254 | |
255 | /* | |
256 | * Free the transmit buffer page. | |
257 | */ | |
ebd2c8f6 AC |
258 | if (state->xmit.buf) { |
259 | free_page((unsigned long)state->xmit.buf); | |
260 | state->xmit.buf = NULL; | |
1da177e4 | 261 | } |
1da177e4 LT |
262 | } |
263 | ||
264 | /** | |
265 | * uart_update_timeout - update per-port FIFO timeout. | |
266 | * @port: uart_port structure describing the port | |
267 | * @cflag: termios cflag value | |
268 | * @baud: speed of the port | |
269 | * | |
270 | * Set the port FIFO timeout value. The @cflag value should | |
271 | * reflect the actual hardware settings. | |
272 | */ | |
273 | void | |
274 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
275 | unsigned int baud) | |
276 | { | |
277 | unsigned int bits; | |
278 | ||
279 | /* byte size and parity */ | |
280 | switch (cflag & CSIZE) { | |
281 | case CS5: | |
282 | bits = 7; | |
283 | break; | |
284 | case CS6: | |
285 | bits = 8; | |
286 | break; | |
287 | case CS7: | |
288 | bits = 9; | |
289 | break; | |
290 | default: | |
291 | bits = 10; | |
a46c9994 | 292 | break; /* CS8 */ |
1da177e4 LT |
293 | } |
294 | ||
295 | if (cflag & CSTOPB) | |
296 | bits++; | |
297 | if (cflag & PARENB) | |
298 | bits++; | |
299 | ||
300 | /* | |
301 | * The total number of bits to be transmitted in the fifo. | |
302 | */ | |
303 | bits = bits * port->fifosize; | |
304 | ||
305 | /* | |
306 | * Figure the timeout to send the above number of bits. | |
307 | * Add .02 seconds of slop | |
308 | */ | |
309 | port->timeout = (HZ * bits) / baud + HZ/50; | |
310 | } | |
311 | ||
312 | EXPORT_SYMBOL(uart_update_timeout); | |
313 | ||
314 | /** | |
315 | * uart_get_baud_rate - return baud rate for a particular port | |
316 | * @port: uart_port structure describing the port in question. | |
317 | * @termios: desired termios settings. | |
318 | * @old: old termios (or NULL) | |
319 | * @min: minimum acceptable baud rate | |
320 | * @max: maximum acceptable baud rate | |
321 | * | |
322 | * Decode the termios structure into a numeric baud rate, | |
323 | * taking account of the magic 38400 baud rate (with spd_* | |
324 | * flags), and mapping the %B0 rate to 9600 baud. | |
325 | * | |
326 | * If the new baud rate is invalid, try the old termios setting. | |
327 | * If it's still invalid, we try 9600 baud. | |
328 | * | |
329 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
330 | * we're actually going to be using. Don't do this for the case |
331 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
332 | */ |
333 | unsigned int | |
606d099c AC |
334 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
335 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
336 | { |
337 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 338 | int hung_up = 0; |
0077d45e | 339 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
340 | |
341 | if (flags == UPF_SPD_HI) | |
342 | altbaud = 57600; | |
82cb7ba1 | 343 | else if (flags == UPF_SPD_VHI) |
1da177e4 | 344 | altbaud = 115200; |
82cb7ba1 | 345 | else if (flags == UPF_SPD_SHI) |
1da177e4 | 346 | altbaud = 230400; |
82cb7ba1 | 347 | else if (flags == UPF_SPD_WARP) |
1da177e4 LT |
348 | altbaud = 460800; |
349 | ||
350 | for (try = 0; try < 2; try++) { | |
351 | baud = tty_termios_baud_rate(termios); | |
352 | ||
353 | /* | |
354 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
355 | * Die! Die! Die! | |
356 | */ | |
357 | if (baud == 38400) | |
358 | baud = altbaud; | |
359 | ||
360 | /* | |
361 | * Special case: B0 rate. | |
362 | */ | |
eb424fd2 AC |
363 | if (baud == 0) { |
364 | hung_up = 1; | |
1da177e4 | 365 | baud = 9600; |
eb424fd2 | 366 | } |
1da177e4 LT |
367 | |
368 | if (baud >= min && baud <= max) | |
369 | return baud; | |
370 | ||
371 | /* | |
372 | * Oops, the quotient was zero. Try again with | |
373 | * the old baud rate if possible. | |
374 | */ | |
375 | termios->c_cflag &= ~CBAUD; | |
376 | if (old) { | |
6d4d67be | 377 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
378 | if (!hung_up) |
379 | tty_termios_encode_baud_rate(termios, | |
380 | baud, baud); | |
1da177e4 LT |
381 | old = NULL; |
382 | continue; | |
383 | } | |
384 | ||
385 | /* | |
16ae2a87 AC |
386 | * As a last resort, if the range cannot be met then clip to |
387 | * the nearest chip supported rate. | |
1da177e4 | 388 | */ |
16ae2a87 AC |
389 | if (!hung_up) { |
390 | if (baud <= min) | |
391 | tty_termios_encode_baud_rate(termios, | |
392 | min + 1, min + 1); | |
393 | else | |
394 | tty_termios_encode_baud_rate(termios, | |
395 | max - 1, max - 1); | |
396 | } | |
1da177e4 | 397 | } |
16ae2a87 AC |
398 | /* Should never happen */ |
399 | WARN_ON(1); | |
1da177e4 LT |
400 | return 0; |
401 | } | |
402 | ||
403 | EXPORT_SYMBOL(uart_get_baud_rate); | |
404 | ||
405 | /** | |
406 | * uart_get_divisor - return uart clock divisor | |
407 | * @port: uart_port structure describing the port. | |
408 | * @baud: desired baud rate | |
409 | * | |
410 | * Calculate the uart clock divisor for the port. | |
411 | */ | |
412 | unsigned int | |
413 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
414 | { | |
415 | unsigned int quot; | |
416 | ||
417 | /* | |
418 | * Old custom speed handling. | |
419 | */ | |
420 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
421 | quot = port->custom_divisor; | |
422 | else | |
423 | quot = (port->uartclk + (8 * baud)) / (16 * baud); | |
424 | ||
425 | return quot; | |
426 | } | |
427 | ||
428 | EXPORT_SYMBOL(uart_get_divisor); | |
429 | ||
23d22cea | 430 | /* FIXME: Consistent locking policy */ |
19225135 AC |
431 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
432 | struct ktermios *old_termios) | |
1da177e4 | 433 | { |
ccce6deb | 434 | struct tty_port *port = &state->port; |
ccce6deb | 435 | struct uart_port *uport = state->uart_port; |
606d099c | 436 | struct ktermios *termios; |
1da177e4 LT |
437 | |
438 | /* | |
439 | * If we have no tty, termios, or the port does not exist, | |
440 | * then we can't set the parameters for this port. | |
441 | */ | |
ccce6deb | 442 | if (!tty || !tty->termios || uport->type == PORT_UNKNOWN) |
1da177e4 LT |
443 | return; |
444 | ||
445 | termios = tty->termios; | |
446 | ||
447 | /* | |
448 | * Set flags based on termios cflag | |
449 | */ | |
450 | if (termios->c_cflag & CRTSCTS) | |
ccce6deb | 451 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 | 452 | else |
ccce6deb | 453 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 LT |
454 | |
455 | if (termios->c_cflag & CLOCAL) | |
ccce6deb | 456 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 457 | else |
ccce6deb | 458 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 459 | |
ccce6deb | 460 | uport->ops->set_termios(uport, termios, old_termios); |
1da177e4 LT |
461 | } |
462 | ||
19225135 AC |
463 | static inline int __uart_put_char(struct uart_port *port, |
464 | struct circ_buf *circ, unsigned char c) | |
1da177e4 LT |
465 | { |
466 | unsigned long flags; | |
23d22cea | 467 | int ret = 0; |
1da177e4 LT |
468 | |
469 | if (!circ->buf) | |
23d22cea | 470 | return 0; |
1da177e4 LT |
471 | |
472 | spin_lock_irqsave(&port->lock, flags); | |
473 | if (uart_circ_chars_free(circ) != 0) { | |
474 | circ->buf[circ->head] = c; | |
475 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 476 | ret = 1; |
1da177e4 LT |
477 | } |
478 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 479 | return ret; |
1da177e4 LT |
480 | } |
481 | ||
23d22cea | 482 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
483 | { |
484 | struct uart_state *state = tty->driver_data; | |
485 | ||
ebd2c8f6 | 486 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
1da177e4 LT |
487 | } |
488 | ||
489 | static void uart_flush_chars(struct tty_struct *tty) | |
490 | { | |
491 | uart_start(tty); | |
492 | } | |
493 | ||
19225135 AC |
494 | static int uart_write(struct tty_struct *tty, |
495 | const unsigned char *buf, int count) | |
1da177e4 LT |
496 | { |
497 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
498 | struct uart_port *port; |
499 | struct circ_buf *circ; | |
1da177e4 LT |
500 | unsigned long flags; |
501 | int c, ret = 0; | |
502 | ||
d5f735e5 PM |
503 | /* |
504 | * This means you called this function _after_ the port was | |
505 | * closed. No cookie for you. | |
506 | */ | |
f751928e | 507 | if (!state) { |
d5f735e5 PM |
508 | WARN_ON(1); |
509 | return -EL3HLT; | |
510 | } | |
511 | ||
ebd2c8f6 AC |
512 | port = state->uart_port; |
513 | circ = &state->xmit; | |
d5f735e5 | 514 | |
1da177e4 LT |
515 | if (!circ->buf) |
516 | return 0; | |
517 | ||
518 | spin_lock_irqsave(&port->lock, flags); | |
519 | while (1) { | |
520 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
521 | if (count < c) | |
522 | c = count; | |
523 | if (c <= 0) | |
524 | break; | |
525 | memcpy(circ->buf + circ->head, buf, c); | |
526 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
527 | buf += c; | |
528 | count -= c; | |
529 | ret += c; | |
530 | } | |
531 | spin_unlock_irqrestore(&port->lock, flags); | |
532 | ||
533 | uart_start(tty); | |
534 | return ret; | |
535 | } | |
536 | ||
537 | static int uart_write_room(struct tty_struct *tty) | |
538 | { | |
539 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
540 | unsigned long flags; |
541 | int ret; | |
1da177e4 | 542 | |
ebd2c8f6 AC |
543 | spin_lock_irqsave(&state->uart_port->lock, flags); |
544 | ret = uart_circ_chars_free(&state->xmit); | |
545 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 546 | return ret; |
1da177e4 LT |
547 | } |
548 | ||
549 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
550 | { | |
551 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
552 | unsigned long flags; |
553 | int ret; | |
1da177e4 | 554 | |
ebd2c8f6 AC |
555 | spin_lock_irqsave(&state->uart_port->lock, flags); |
556 | ret = uart_circ_chars_pending(&state->xmit); | |
557 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 558 | return ret; |
1da177e4 LT |
559 | } |
560 | ||
561 | static void uart_flush_buffer(struct tty_struct *tty) | |
562 | { | |
563 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 564 | struct uart_port *port; |
1da177e4 LT |
565 | unsigned long flags; |
566 | ||
d5f735e5 PM |
567 | /* |
568 | * This means you called this function _after_ the port was | |
569 | * closed. No cookie for you. | |
570 | */ | |
f751928e | 571 | if (!state) { |
d5f735e5 PM |
572 | WARN_ON(1); |
573 | return; | |
574 | } | |
575 | ||
ebd2c8f6 | 576 | port = state->uart_port; |
eb3a1e11 | 577 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
578 | |
579 | spin_lock_irqsave(&port->lock, flags); | |
ebd2c8f6 | 580 | uart_circ_clear(&state->xmit); |
6bb0e3a5 HS |
581 | if (port->ops->flush_buffer) |
582 | port->ops->flush_buffer(port); | |
1da177e4 LT |
583 | spin_unlock_irqrestore(&port->lock, flags); |
584 | tty_wakeup(tty); | |
585 | } | |
586 | ||
587 | /* | |
588 | * This function is used to send a high-priority XON/XOFF character to | |
589 | * the device | |
590 | */ | |
591 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
592 | { | |
593 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 594 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
595 | unsigned long flags; |
596 | ||
597 | if (port->ops->send_xchar) | |
598 | port->ops->send_xchar(port, ch); | |
599 | else { | |
600 | port->x_char = ch; | |
601 | if (ch) { | |
602 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 603 | port->ops->start_tx(port); |
1da177e4 LT |
604 | spin_unlock_irqrestore(&port->lock, flags); |
605 | } | |
606 | } | |
607 | } | |
608 | ||
609 | static void uart_throttle(struct tty_struct *tty) | |
610 | { | |
611 | struct uart_state *state = tty->driver_data; | |
612 | ||
613 | if (I_IXOFF(tty)) | |
614 | uart_send_xchar(tty, STOP_CHAR(tty)); | |
615 | ||
616 | if (tty->termios->c_cflag & CRTSCTS) | |
ebd2c8f6 | 617 | uart_clear_mctrl(state->uart_port, TIOCM_RTS); |
1da177e4 LT |
618 | } |
619 | ||
620 | static void uart_unthrottle(struct tty_struct *tty) | |
621 | { | |
622 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 623 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
624 | |
625 | if (I_IXOFF(tty)) { | |
626 | if (port->x_char) | |
627 | port->x_char = 0; | |
628 | else | |
629 | uart_send_xchar(tty, START_CHAR(tty)); | |
630 | } | |
631 | ||
632 | if (tty->termios->c_cflag & CRTSCTS) | |
633 | uart_set_mctrl(port, TIOCM_RTS); | |
634 | } | |
635 | ||
636 | static int uart_get_info(struct uart_state *state, | |
637 | struct serial_struct __user *retinfo) | |
638 | { | |
a2bceae0 AC |
639 | struct uart_port *uport = state->uart_port; |
640 | struct tty_port *port = &state->port; | |
1da177e4 LT |
641 | struct serial_struct tmp; |
642 | ||
643 | memset(&tmp, 0, sizeof(tmp)); | |
f34d7a5b AC |
644 | |
645 | /* Ensure the state we copy is consistent and no hardware changes | |
646 | occur as we go */ | |
a2bceae0 | 647 | mutex_lock(&port->mutex); |
f34d7a5b | 648 | |
a2bceae0 AC |
649 | tmp.type = uport->type; |
650 | tmp.line = uport->line; | |
651 | tmp.port = uport->iobase; | |
1da177e4 | 652 | if (HIGH_BITS_OFFSET) |
a2bceae0 AC |
653 | tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
654 | tmp.irq = uport->irq; | |
655 | tmp.flags = uport->flags; | |
656 | tmp.xmit_fifo_size = uport->fifosize; | |
657 | tmp.baud_base = uport->uartclk / 16; | |
658 | tmp.close_delay = port->close_delay / 10; | |
016af53a | 659 | tmp.closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
1da177e4 | 660 | ASYNC_CLOSING_WAIT_NONE : |
a2bceae0 AC |
661 | port->closing_wait / 10; |
662 | tmp.custom_divisor = uport->custom_divisor; | |
663 | tmp.hub6 = uport->hub6; | |
664 | tmp.io_type = uport->iotype; | |
665 | tmp.iomem_reg_shift = uport->regshift; | |
666 | tmp.iomem_base = (void *)(unsigned long)uport->mapbase; | |
1da177e4 | 667 | |
a2bceae0 | 668 | mutex_unlock(&port->mutex); |
f34d7a5b | 669 | |
1da177e4 LT |
670 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
671 | return -EFAULT; | |
672 | return 0; | |
673 | } | |
674 | ||
19225135 | 675 | static int uart_set_info(struct tty_struct *tty, struct uart_state *state, |
1da177e4 LT |
676 | struct serial_struct __user *newinfo) |
677 | { | |
678 | struct serial_struct new_serial; | |
46d57a44 AC |
679 | struct uart_port *uport = state->uart_port; |
680 | struct tty_port *port = &state->port; | |
1da177e4 | 681 | unsigned long new_port; |
0077d45e | 682 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 683 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 684 | upf_t old_flags, new_flags; |
1da177e4 LT |
685 | int retval = 0; |
686 | ||
687 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
688 | return -EFAULT; | |
689 | ||
690 | new_port = new_serial.port; | |
691 | if (HIGH_BITS_OFFSET) | |
692 | new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; | |
693 | ||
694 | new_serial.irq = irq_canonicalize(new_serial.irq); | |
695 | close_delay = new_serial.close_delay * 10; | |
696 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
016af53a | 697 | ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; |
1da177e4 LT |
698 | |
699 | /* | |
91312cdb | 700 | * This semaphore protects port->count. It is also |
1da177e4 LT |
701 | * very useful to prevent opens. Also, take the |
702 | * port configuration semaphore to make sure that a | |
703 | * module insertion/removal doesn't change anything | |
704 | * under us. | |
705 | */ | |
a2bceae0 | 706 | mutex_lock(&port->mutex); |
1da177e4 | 707 | |
46d57a44 AC |
708 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
709 | && new_serial.irq != uport->irq; | |
1da177e4 LT |
710 | |
711 | /* | |
712 | * Since changing the 'type' of the port changes its resource | |
713 | * allocations, we should treat type changes the same as | |
714 | * IO port changes. | |
715 | */ | |
46d57a44 AC |
716 | change_port = !(uport->flags & UPF_FIXED_PORT) |
717 | && (new_port != uport->iobase || | |
718 | (unsigned long)new_serial.iomem_base != uport->mapbase || | |
719 | new_serial.hub6 != uport->hub6 || | |
720 | new_serial.io_type != uport->iotype || | |
721 | new_serial.iomem_reg_shift != uport->regshift || | |
722 | new_serial.type != uport->type); | |
723 | ||
724 | old_flags = uport->flags; | |
0077d45e | 725 | new_flags = new_serial.flags; |
46d57a44 | 726 | old_custom_divisor = uport->custom_divisor; |
1da177e4 LT |
727 | |
728 | if (!capable(CAP_SYS_ADMIN)) { | |
729 | retval = -EPERM; | |
730 | if (change_irq || change_port || | |
46d57a44 AC |
731 | (new_serial.baud_base != uport->uartclk / 16) || |
732 | (close_delay != port->close_delay) || | |
733 | (closing_wait != port->closing_wait) || | |
947deee8 | 734 | (new_serial.xmit_fifo_size && |
46d57a44 | 735 | new_serial.xmit_fifo_size != uport->fifosize) || |
0077d45e | 736 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 | 737 | goto exit; |
46d57a44 | 738 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
0077d45e | 739 | (new_flags & UPF_USR_MASK)); |
46d57a44 | 740 | uport->custom_divisor = new_serial.custom_divisor; |
1da177e4 LT |
741 | goto check_and_exit; |
742 | } | |
743 | ||
744 | /* | |
745 | * Ask the low level driver to verify the settings. | |
746 | */ | |
46d57a44 AC |
747 | if (uport->ops->verify_port) |
748 | retval = uport->ops->verify_port(uport, &new_serial); | |
1da177e4 | 749 | |
a62c4133 | 750 | if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || |
1da177e4 LT |
751 | (new_serial.baud_base < 9600)) |
752 | retval = -EINVAL; | |
753 | ||
754 | if (retval) | |
755 | goto exit; | |
756 | ||
757 | if (change_port || change_irq) { | |
758 | retval = -EBUSY; | |
759 | ||
760 | /* | |
761 | * Make sure that we are the sole user of this port. | |
762 | */ | |
b58d13a0 | 763 | if (tty_port_users(port) > 1) |
1da177e4 LT |
764 | goto exit; |
765 | ||
766 | /* | |
767 | * We need to shutdown the serial port at the old | |
768 | * port/type/irq combination. | |
769 | */ | |
19225135 | 770 | uart_shutdown(tty, state); |
1da177e4 LT |
771 | } |
772 | ||
773 | if (change_port) { | |
774 | unsigned long old_iobase, old_mapbase; | |
775 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
776 | ||
46d57a44 AC |
777 | old_iobase = uport->iobase; |
778 | old_mapbase = uport->mapbase; | |
779 | old_type = uport->type; | |
780 | old_hub6 = uport->hub6; | |
781 | old_iotype = uport->iotype; | |
782 | old_shift = uport->regshift; | |
1da177e4 LT |
783 | |
784 | /* | |
785 | * Free and release old regions | |
786 | */ | |
787 | if (old_type != PORT_UNKNOWN) | |
46d57a44 | 788 | uport->ops->release_port(uport); |
1da177e4 | 789 | |
46d57a44 AC |
790 | uport->iobase = new_port; |
791 | uport->type = new_serial.type; | |
792 | uport->hub6 = new_serial.hub6; | |
793 | uport->iotype = new_serial.io_type; | |
794 | uport->regshift = new_serial.iomem_reg_shift; | |
795 | uport->mapbase = (unsigned long)new_serial.iomem_base; | |
1da177e4 LT |
796 | |
797 | /* | |
798 | * Claim and map the new regions | |
799 | */ | |
46d57a44 AC |
800 | if (uport->type != PORT_UNKNOWN) { |
801 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
802 | } else { |
803 | /* Always success - Jean II */ | |
804 | retval = 0; | |
805 | } | |
806 | ||
807 | /* | |
808 | * If we fail to request resources for the | |
809 | * new port, try to restore the old settings. | |
810 | */ | |
811 | if (retval && old_type != PORT_UNKNOWN) { | |
46d57a44 AC |
812 | uport->iobase = old_iobase; |
813 | uport->type = old_type; | |
814 | uport->hub6 = old_hub6; | |
815 | uport->iotype = old_iotype; | |
816 | uport->regshift = old_shift; | |
817 | uport->mapbase = old_mapbase; | |
818 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
819 | /* |
820 | * If we failed to restore the old settings, | |
821 | * we fail like this. | |
822 | */ | |
823 | if (retval) | |
46d57a44 | 824 | uport->type = PORT_UNKNOWN; |
1da177e4 LT |
825 | |
826 | /* | |
827 | * We failed anyway. | |
828 | */ | |
829 | retval = -EBUSY; | |
a46c9994 AC |
830 | /* Added to return the correct error -Ram Gupta */ |
831 | goto exit; | |
1da177e4 LT |
832 | } |
833 | } | |
834 | ||
abb4a239 | 835 | if (change_irq) |
46d57a44 AC |
836 | uport->irq = new_serial.irq; |
837 | if (!(uport->flags & UPF_FIXED_PORT)) | |
838 | uport->uartclk = new_serial.baud_base * 16; | |
839 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | | |
0077d45e | 840 | (new_flags & UPF_CHANGE_MASK); |
46d57a44 AC |
841 | uport->custom_divisor = new_serial.custom_divisor; |
842 | port->close_delay = close_delay; | |
843 | port->closing_wait = closing_wait; | |
947deee8 | 844 | if (new_serial.xmit_fifo_size) |
46d57a44 AC |
845 | uport->fifosize = new_serial.xmit_fifo_size; |
846 | if (port->tty) | |
847 | port->tty->low_latency = | |
848 | (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
1da177e4 LT |
849 | |
850 | check_and_exit: | |
851 | retval = 0; | |
46d57a44 | 852 | if (uport->type == PORT_UNKNOWN) |
1da177e4 | 853 | goto exit; |
ccce6deb | 854 | if (port->flags & ASYNC_INITIALIZED) { |
46d57a44 AC |
855 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
856 | old_custom_divisor != uport->custom_divisor) { | |
1da177e4 LT |
857 | /* |
858 | * If they're setting up a custom divisor or speed, | |
859 | * instead of clearing it, then bitch about it. No | |
860 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
861 | */ | |
46d57a44 | 862 | if (uport->flags & UPF_SPD_MASK) { |
1da177e4 LT |
863 | char buf[64]; |
864 | printk(KERN_NOTICE | |
865 | "%s sets custom speed on %s. This " | |
866 | "is deprecated.\n", current->comm, | |
46d57a44 | 867 | tty_name(port->tty, buf)); |
1da177e4 | 868 | } |
19225135 | 869 | uart_change_speed(tty, state, NULL); |
1da177e4 LT |
870 | } |
871 | } else | |
19225135 | 872 | retval = uart_startup(tty, state, 1); |
1da177e4 | 873 | exit: |
a2bceae0 | 874 | mutex_unlock(&port->mutex); |
1da177e4 LT |
875 | return retval; |
876 | } | |
877 | ||
19225135 AC |
878 | /** |
879 | * uart_get_lsr_info - get line status register info | |
880 | * @tty: tty associated with the UART | |
881 | * @state: UART being queried | |
882 | * @value: returned modem value | |
883 | * | |
884 | * Note: uart_ioctl protects us against hangups. | |
1da177e4 | 885 | */ |
19225135 AC |
886 | static int uart_get_lsr_info(struct tty_struct *tty, |
887 | struct uart_state *state, unsigned int __user *value) | |
1da177e4 | 888 | { |
46d57a44 | 889 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
890 | unsigned int result; |
891 | ||
46d57a44 | 892 | result = uport->ops->tx_empty(uport); |
1da177e4 LT |
893 | |
894 | /* | |
895 | * If we're about to load something into the transmit | |
896 | * register, we'll pretend the transmitter isn't empty to | |
897 | * avoid a race condition (depending on when the transmit | |
898 | * interrupt happens). | |
899 | */ | |
46d57a44 | 900 | if (uport->x_char || |
ebd2c8f6 | 901 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
19225135 | 902 | !tty->stopped && !tty->hw_stopped)) |
1da177e4 | 903 | result &= ~TIOCSER_TEMT; |
a46c9994 | 904 | |
1da177e4 LT |
905 | return put_user(result, value); |
906 | } | |
907 | ||
60b33c13 | 908 | static int uart_tiocmget(struct tty_struct *tty) |
1da177e4 LT |
909 | { |
910 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 911 | struct tty_port *port = &state->port; |
46d57a44 | 912 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
913 | int result = -EIO; |
914 | ||
a2bceae0 | 915 | mutex_lock(&port->mutex); |
60b33c13 | 916 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 917 | result = uport->mctrl; |
46d57a44 AC |
918 | spin_lock_irq(&uport->lock); |
919 | result |= uport->ops->get_mctrl(uport); | |
920 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 921 | } |
a2bceae0 | 922 | mutex_unlock(&port->mutex); |
1da177e4 LT |
923 | |
924 | return result; | |
925 | } | |
926 | ||
927 | static int | |
20b9d177 | 928 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
1da177e4 LT |
929 | { |
930 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 931 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 932 | struct tty_port *port = &state->port; |
1da177e4 LT |
933 | int ret = -EIO; |
934 | ||
a2bceae0 | 935 | mutex_lock(&port->mutex); |
20b9d177 | 936 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 937 | uart_update_mctrl(uport, set, clear); |
1da177e4 LT |
938 | ret = 0; |
939 | } | |
a2bceae0 | 940 | mutex_unlock(&port->mutex); |
1da177e4 LT |
941 | return ret; |
942 | } | |
943 | ||
9e98966c | 944 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
945 | { |
946 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 947 | struct tty_port *port = &state->port; |
46d57a44 | 948 | struct uart_port *uport = state->uart_port; |
1da177e4 | 949 | |
a2bceae0 | 950 | mutex_lock(&port->mutex); |
1da177e4 | 951 | |
46d57a44 AC |
952 | if (uport->type != PORT_UNKNOWN) |
953 | uport->ops->break_ctl(uport, break_state); | |
1da177e4 | 954 | |
a2bceae0 | 955 | mutex_unlock(&port->mutex); |
9e98966c | 956 | return 0; |
1da177e4 LT |
957 | } |
958 | ||
19225135 | 959 | static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) |
1da177e4 | 960 | { |
46d57a44 | 961 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 962 | struct tty_port *port = &state->port; |
1da177e4 LT |
963 | int flags, ret; |
964 | ||
965 | if (!capable(CAP_SYS_ADMIN)) | |
966 | return -EPERM; | |
967 | ||
968 | /* | |
969 | * Take the per-port semaphore. This prevents count from | |
970 | * changing, and hence any extra opens of the port while | |
971 | * we're auto-configuring. | |
972 | */ | |
a2bceae0 | 973 | if (mutex_lock_interruptible(&port->mutex)) |
1da177e4 LT |
974 | return -ERESTARTSYS; |
975 | ||
976 | ret = -EBUSY; | |
b58d13a0 | 977 | if (tty_port_users(port) == 1) { |
19225135 | 978 | uart_shutdown(tty, state); |
1da177e4 LT |
979 | |
980 | /* | |
981 | * If we already have a port type configured, | |
982 | * we must release its resources. | |
983 | */ | |
46d57a44 AC |
984 | if (uport->type != PORT_UNKNOWN) |
985 | uport->ops->release_port(uport); | |
1da177e4 LT |
986 | |
987 | flags = UART_CONFIG_TYPE; | |
46d57a44 | 988 | if (uport->flags & UPF_AUTO_IRQ) |
1da177e4 LT |
989 | flags |= UART_CONFIG_IRQ; |
990 | ||
991 | /* | |
992 | * This will claim the ports resources if | |
993 | * a port is found. | |
994 | */ | |
46d57a44 | 995 | uport->ops->config_port(uport, flags); |
1da177e4 | 996 | |
19225135 | 997 | ret = uart_startup(tty, state, 1); |
1da177e4 | 998 | } |
a2bceae0 | 999 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1000 | return ret; |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1005 | * - mask passed in arg for lines of interest | |
1006 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1007 | * Caller should use TIOCGICOUNT to see which one it was | |
bdc04e31 AC |
1008 | * |
1009 | * FIXME: This wants extracting into a common all driver implementation | |
1010 | * of TIOCMWAIT using tty_port. | |
1da177e4 LT |
1011 | */ |
1012 | static int | |
1013 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
1014 | { | |
46d57a44 | 1015 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 1016 | struct tty_port *port = &state->port; |
1da177e4 LT |
1017 | DECLARE_WAITQUEUE(wait, current); |
1018 | struct uart_icount cprev, cnow; | |
1019 | int ret; | |
1020 | ||
1021 | /* | |
1022 | * note the counters on entry | |
1023 | */ | |
46d57a44 AC |
1024 | spin_lock_irq(&uport->lock); |
1025 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); | |
1da177e4 LT |
1026 | |
1027 | /* | |
1028 | * Force modem status interrupts on | |
1029 | */ | |
46d57a44 AC |
1030 | uport->ops->enable_ms(uport); |
1031 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1032 | |
bdc04e31 | 1033 | add_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 | 1034 | for (;;) { |
46d57a44 AC |
1035 | spin_lock_irq(&uport->lock); |
1036 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1037 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1038 | |
1039 | set_current_state(TASK_INTERRUPTIBLE); | |
1040 | ||
1041 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1042 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1043 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1044 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1045 | ret = 0; |
1046 | break; | |
1da177e4 LT |
1047 | } |
1048 | ||
1049 | schedule(); | |
1050 | ||
1051 | /* see if a signal did it */ | |
1052 | if (signal_pending(current)) { | |
1053 | ret = -ERESTARTSYS; | |
1054 | break; | |
1055 | } | |
1056 | ||
1057 | cprev = cnow; | |
1058 | } | |
1059 | ||
1060 | current->state = TASK_RUNNING; | |
bdc04e31 | 1061 | remove_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 LT |
1062 | |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1068 | * Return: write counters to the user passed counter struct | |
1069 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1070 | * RI where only 0->1 is counted. | |
1071 | */ | |
d281da7f AC |
1072 | static int uart_get_icount(struct tty_struct *tty, |
1073 | struct serial_icounter_struct *icount) | |
1da177e4 | 1074 | { |
d281da7f | 1075 | struct uart_state *state = tty->driver_data; |
1da177e4 | 1076 | struct uart_icount cnow; |
46d57a44 | 1077 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1078 | |
46d57a44 AC |
1079 | spin_lock_irq(&uport->lock); |
1080 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1081 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1082 | |
d281da7f AC |
1083 | icount->cts = cnow.cts; |
1084 | icount->dsr = cnow.dsr; | |
1085 | icount->rng = cnow.rng; | |
1086 | icount->dcd = cnow.dcd; | |
1087 | icount->rx = cnow.rx; | |
1088 | icount->tx = cnow.tx; | |
1089 | icount->frame = cnow.frame; | |
1090 | icount->overrun = cnow.overrun; | |
1091 | icount->parity = cnow.parity; | |
1092 | icount->brk = cnow.brk; | |
1093 | icount->buf_overrun = cnow.buf_overrun; | |
1094 | ||
1095 | return 0; | |
1da177e4 LT |
1096 | } |
1097 | ||
1098 | /* | |
e5238442 | 1099 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1100 | */ |
1101 | static int | |
6caa76b7 | 1102 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, |
1da177e4 LT |
1103 | unsigned long arg) |
1104 | { | |
1105 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1106 | struct tty_port *port = &state->port; |
1da177e4 LT |
1107 | void __user *uarg = (void __user *)arg; |
1108 | int ret = -ENOIOCTLCMD; | |
1109 | ||
1da177e4 LT |
1110 | |
1111 | /* | |
1112 | * These ioctls don't rely on the hardware to be present. | |
1113 | */ | |
1114 | switch (cmd) { | |
1115 | case TIOCGSERIAL: | |
1116 | ret = uart_get_info(state, uarg); | |
1117 | break; | |
1118 | ||
1119 | case TIOCSSERIAL: | |
19225135 | 1120 | ret = uart_set_info(tty, state, uarg); |
1da177e4 LT |
1121 | break; |
1122 | ||
1123 | case TIOCSERCONFIG: | |
19225135 | 1124 | ret = uart_do_autoconfig(tty, state); |
1da177e4 LT |
1125 | break; |
1126 | ||
1127 | case TIOCSERGWILD: /* obsolete */ | |
1128 | case TIOCSERSWILD: /* obsolete */ | |
1129 | ret = 0; | |
1130 | break; | |
1131 | } | |
1132 | ||
1133 | if (ret != -ENOIOCTLCMD) | |
1134 | goto out; | |
1135 | ||
1136 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1137 | ret = -EIO; | |
1138 | goto out; | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * The following should only be used when hardware is present. | |
1143 | */ | |
1144 | switch (cmd) { | |
1145 | case TIOCMIWAIT: | |
1146 | ret = uart_wait_modem_status(state, arg); | |
1147 | break; | |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | if (ret != -ENOIOCTLCMD) | |
1151 | goto out; | |
1152 | ||
a2bceae0 | 1153 | mutex_lock(&port->mutex); |
1da177e4 | 1154 | |
6caa76b7 | 1155 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
1da177e4 LT |
1156 | ret = -EIO; |
1157 | goto out_up; | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * All these rely on hardware being present and need to be | |
1162 | * protected against the tty being hung up. | |
1163 | */ | |
1164 | switch (cmd) { | |
1165 | case TIOCSERGETLSR: /* Get line status register */ | |
19225135 | 1166 | ret = uart_get_lsr_info(tty, state, uarg); |
1da177e4 LT |
1167 | break; |
1168 | ||
1169 | default: { | |
46d57a44 AC |
1170 | struct uart_port *uport = state->uart_port; |
1171 | if (uport->ops->ioctl) | |
1172 | ret = uport->ops->ioctl(uport, cmd, arg); | |
1da177e4 LT |
1173 | break; |
1174 | } | |
1175 | } | |
f34d7a5b | 1176 | out_up: |
a2bceae0 | 1177 | mutex_unlock(&port->mutex); |
f34d7a5b | 1178 | out: |
1da177e4 LT |
1179 | return ret; |
1180 | } | |
1181 | ||
edeb280e | 1182 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1183 | { |
1184 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1185 | struct uart_port *uport = state->uart_port; |
64e9159f | 1186 | |
46d57a44 | 1187 | if (uport->ops->set_ldisc) |
d87d9b7d | 1188 | uport->ops->set_ldisc(uport, tty->termios->c_line); |
64e9159f AC |
1189 | } |
1190 | ||
a46c9994 AC |
1191 | static void uart_set_termios(struct tty_struct *tty, |
1192 | struct ktermios *old_termios) | |
1da177e4 LT |
1193 | { |
1194 | struct uart_state *state = tty->driver_data; | |
1195 | unsigned long flags; | |
1196 | unsigned int cflag = tty->termios->c_cflag; | |
1197 | ||
1da177e4 LT |
1198 | |
1199 | /* | |
1200 | * These are the bits that are used to setup various | |
20620d68 DW |
1201 | * flags in the low level driver. We can ignore the Bfoo |
1202 | * bits in c_cflag; c_[io]speed will always be set | |
1203 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 LT |
1204 | */ |
1205 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
1da177e4 | 1206 | if ((cflag ^ old_termios->c_cflag) == 0 && |
20620d68 DW |
1207 | tty->termios->c_ospeed == old_termios->c_ospeed && |
1208 | tty->termios->c_ispeed == old_termios->c_ispeed && | |
e5238442 | 1209 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { |
1da177e4 | 1210 | return; |
e5238442 | 1211 | } |
1da177e4 | 1212 | |
19225135 | 1213 | uart_change_speed(tty, state, old_termios); |
1da177e4 LT |
1214 | |
1215 | /* Handle transition to B0 status */ | |
1216 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
ebd2c8f6 | 1217 | uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 1218 | /* Handle transition away from B0 status */ |
82cb7ba1 | 1219 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 LT |
1220 | unsigned int mask = TIOCM_DTR; |
1221 | if (!(cflag & CRTSCTS) || | |
1222 | !test_bit(TTY_THROTTLED, &tty->flags)) | |
1223 | mask |= TIOCM_RTS; | |
ebd2c8f6 | 1224 | uart_set_mctrl(state->uart_port, mask); |
1da177e4 LT |
1225 | } |
1226 | ||
1227 | /* Handle turning off CRTSCTS */ | |
1228 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
ebd2c8f6 | 1229 | spin_lock_irqsave(&state->uart_port->lock, flags); |
1da177e4 LT |
1230 | tty->hw_stopped = 0; |
1231 | __uart_start(tty); | |
ebd2c8f6 | 1232 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
1da177e4 | 1233 | } |
0dd7a1ae | 1234 | /* Handle turning on CRTSCTS */ |
82cb7ba1 | 1235 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
ebd2c8f6 AC |
1236 | spin_lock_irqsave(&state->uart_port->lock, flags); |
1237 | if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { | |
0dd7a1ae | 1238 | tty->hw_stopped = 1; |
ebd2c8f6 | 1239 | state->uart_port->ops->stop_tx(state->uart_port); |
0dd7a1ae | 1240 | } |
ebd2c8f6 | 1241 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
0dd7a1ae | 1242 | } |
1da177e4 LT |
1243 | #if 0 |
1244 | /* | |
1245 | * No need to wake up processes in open wait, since they | |
1246 | * sample the CLOCAL flag once, and don't recheck it. | |
1247 | * XXX It's not clear whether the current behavior is correct | |
1248 | * or not. Hence, this may change..... | |
1249 | */ | |
1250 | if (!(old_termios->c_cflag & CLOCAL) && | |
1251 | (tty->termios->c_cflag & CLOCAL)) | |
ebd2c8f6 | 1252 | wake_up_interruptible(&state->uart_port.open_wait); |
1da177e4 LT |
1253 | #endif |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * In 2.4.5, calls to this will be serialized via the BKL in | |
1258 | * linux/drivers/char/tty_io.c:tty_release() | |
1259 | * linux/drivers/char/tty_io.c:do_tty_handup() | |
1260 | */ | |
1261 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1262 | { | |
1263 | struct uart_state *state = tty->driver_data; | |
46d57a44 AC |
1264 | struct tty_port *port; |
1265 | struct uart_port *uport; | |
61cd8a21 | 1266 | unsigned long flags; |
a46c9994 | 1267 | |
ec79d605 | 1268 | BUG_ON(!tty_locked()); |
1da177e4 | 1269 | |
eea7e17e LT |
1270 | if (!state) |
1271 | return; | |
1272 | ||
46d57a44 AC |
1273 | uport = state->uart_port; |
1274 | port = &state->port; | |
1da177e4 | 1275 | |
46d57a44 | 1276 | pr_debug("uart_close(%d) called\n", uport->line); |
1da177e4 | 1277 | |
a2bceae0 | 1278 | mutex_lock(&port->mutex); |
61cd8a21 | 1279 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 1280 | |
61cd8a21 AC |
1281 | if (tty_hung_up_p(filp)) { |
1282 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 1283 | goto done; |
61cd8a21 | 1284 | } |
1da177e4 | 1285 | |
91312cdb | 1286 | if ((tty->count == 1) && (port->count != 1)) { |
1da177e4 LT |
1287 | /* |
1288 | * Uh, oh. tty->count is 1, which means that the tty | |
91312cdb | 1289 | * structure will be freed. port->count should always |
1da177e4 LT |
1290 | * be one in these conditions. If it's greater than |
1291 | * one, we've got real problems, since it means the | |
1292 | * serial port won't be shutdown. | |
1293 | */ | |
1294 | printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, " | |
91312cdb AC |
1295 | "port->count is %d\n", port->count); |
1296 | port->count = 1; | |
1da177e4 | 1297 | } |
91312cdb | 1298 | if (--port->count < 0) { |
1da177e4 | 1299 | printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n", |
91312cdb AC |
1300 | tty->name, port->count); |
1301 | port->count = 0; | |
1da177e4 | 1302 | } |
61cd8a21 AC |
1303 | if (port->count) { |
1304 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 1305 | goto done; |
61cd8a21 | 1306 | } |
1da177e4 LT |
1307 | |
1308 | /* | |
1309 | * Now we wait for the transmit buffer to clear; and we notify | |
1310 | * the line discipline to only process XON/XOFF characters by | |
1311 | * setting tty->closing. | |
1312 | */ | |
1313 | tty->closing = 1; | |
61cd8a21 | 1314 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 1315 | |
20365219 AB |
1316 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) { |
1317 | /* | |
1318 | * hack: open-coded tty_wait_until_sent to avoid | |
1319 | * recursive tty_lock | |
1320 | */ | |
1321 | long timeout = msecs_to_jiffies(port->closing_wait); | |
1322 | if (wait_event_interruptible_timeout(tty->write_wait, | |
1323 | !tty_chars_in_buffer(tty), timeout) >= 0) | |
1324 | __uart_wait_until_sent(uport, timeout); | |
1325 | } | |
1da177e4 LT |
1326 | |
1327 | /* | |
1328 | * At this point, we stop accepting input. To do this, we | |
1329 | * disable the receive line status interrupts. | |
1330 | */ | |
ccce6deb | 1331 | if (port->flags & ASYNC_INITIALIZED) { |
1da177e4 | 1332 | unsigned long flags; |
eea7e17e | 1333 | spin_lock_irqsave(&uport->lock, flags); |
46d57a44 | 1334 | uport->ops->stop_rx(uport); |
eea7e17e | 1335 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 LT |
1336 | /* |
1337 | * Before we drop DTR, make sure the UART transmitter | |
1338 | * has completely drained; this is especially | |
1339 | * important if there is a transmit FIFO! | |
1340 | */ | |
20365219 | 1341 | __uart_wait_until_sent(uport, uport->timeout); |
1da177e4 LT |
1342 | } |
1343 | ||
19225135 | 1344 | uart_shutdown(tty, state); |
1da177e4 LT |
1345 | uart_flush_buffer(tty); |
1346 | ||
a46c9994 AC |
1347 | tty_ldisc_flush(tty); |
1348 | ||
7b01478f | 1349 | tty_port_tty_set(port, NULL); |
61cd8a21 AC |
1350 | spin_lock_irqsave(&port->lock, flags); |
1351 | tty->closing = 0; | |
1da177e4 | 1352 | |
46d57a44 | 1353 | if (port->blocked_open) { |
61cd8a21 | 1354 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 AC |
1355 | if (port->close_delay) |
1356 | msleep_interruptible(port->close_delay); | |
61cd8a21 | 1357 | spin_lock_irqsave(&port->lock, flags); |
46d57a44 | 1358 | } else if (!uart_console(uport)) { |
61cd8a21 | 1359 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 1360 | uart_change_pm(state, 3); |
61cd8a21 | 1361 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1362 | } |
1363 | ||
1364 | /* | |
1365 | * Wake up anyone trying to open this port. | |
1366 | */ | |
ccce6deb | 1367 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
61cd8a21 | 1368 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1369 | wake_up_interruptible(&port->open_wait); |
1da177e4 | 1370 | |
46d57a44 | 1371 | done: |
a2bceae0 | 1372 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1373 | } |
1374 | ||
20365219 | 1375 | static void __uart_wait_until_sent(struct uart_port *port, int timeout) |
1da177e4 | 1376 | { |
1da177e4 LT |
1377 | unsigned long char_time, expire; |
1378 | ||
1da177e4 LT |
1379 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1380 | return; | |
1381 | ||
1382 | /* | |
1383 | * Set the check interval to be 1/5 of the estimated time to | |
1384 | * send a single character, and make it at least 1. The check | |
1385 | * interval should also be less than the timeout. | |
1386 | * | |
1387 | * Note: we have to use pretty tight timings here to satisfy | |
1388 | * the NIST-PCTS. | |
1389 | */ | |
1390 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1391 | char_time = char_time / 5; | |
1392 | if (char_time == 0) | |
1393 | char_time = 1; | |
1394 | if (timeout && timeout < char_time) | |
1395 | char_time = timeout; | |
1396 | ||
1397 | /* | |
1398 | * If the transmitter hasn't cleared in twice the approximate | |
1399 | * amount of time to send the entire FIFO, it probably won't | |
1400 | * ever clear. This assumes the UART isn't doing flow | |
1401 | * control, which is currently the case. Hence, if it ever | |
1402 | * takes longer than port->timeout, this is probably due to a | |
1403 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1404 | * 2*port->timeout. | |
1405 | */ | |
1406 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1407 | timeout = 2 * port->timeout; | |
1408 | ||
1409 | expire = jiffies + timeout; | |
1410 | ||
eb3a1e11 | 1411 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1412 | port->line, jiffies, expire); |
1da177e4 LT |
1413 | |
1414 | /* | |
1415 | * Check whether the transmitter is empty every 'char_time'. | |
1416 | * 'timeout' / 'expire' give us the maximum amount of time | |
1417 | * we wait. | |
1418 | */ | |
1419 | while (!port->ops->tx_empty(port)) { | |
1420 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1421 | if (signal_pending(current)) | |
1422 | break; | |
1423 | if (time_after(jiffies, expire)) | |
1424 | break; | |
1425 | } | |
1426 | set_current_state(TASK_RUNNING); /* might not be needed */ | |
20365219 AB |
1427 | } |
1428 | ||
1429 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) | |
1430 | { | |
1431 | struct uart_state *state = tty->driver_data; | |
1432 | struct uart_port *port = state->uart_port; | |
1433 | ||
1434 | tty_lock(); | |
1435 | __uart_wait_until_sent(port, timeout); | |
ec79d605 | 1436 | tty_unlock(); |
1da177e4 LT |
1437 | } |
1438 | ||
1439 | /* | |
1440 | * This is called with the BKL held in | |
1441 | * linux/drivers/char/tty_io.c:do_tty_hangup() | |
1442 | * We're called from the eventd thread, so we can sleep for | |
1443 | * a _short_ time only. | |
1444 | */ | |
1445 | static void uart_hangup(struct tty_struct *tty) | |
1446 | { | |
1447 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1448 | struct tty_port *port = &state->port; |
61cd8a21 | 1449 | unsigned long flags; |
1da177e4 | 1450 | |
ec79d605 | 1451 | BUG_ON(!tty_locked()); |
ebd2c8f6 | 1452 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
1da177e4 | 1453 | |
a2bceae0 | 1454 | mutex_lock(&port->mutex); |
ccce6deb | 1455 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
1da177e4 | 1456 | uart_flush_buffer(tty); |
19225135 | 1457 | uart_shutdown(tty, state); |
61cd8a21 | 1458 | spin_lock_irqsave(&port->lock, flags); |
91312cdb | 1459 | port->count = 0; |
ccce6deb | 1460 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
61cd8a21 | 1461 | spin_unlock_irqrestore(&port->lock, flags); |
7b01478f | 1462 | tty_port_tty_set(port, NULL); |
46d57a44 | 1463 | wake_up_interruptible(&port->open_wait); |
bdc04e31 | 1464 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 | 1465 | } |
a2bceae0 | 1466 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1467 | } |
1468 | ||
19225135 AC |
1469 | /** |
1470 | * uart_update_termios - update the terminal hw settings | |
1471 | * @tty: tty associated with UART | |
1472 | * @state: UART to update | |
1473 | * | |
1474 | * Copy across the serial console cflag setting into the termios settings | |
1475 | * for the initial open of the port. This allows continuity between the | |
1476 | * kernel settings, and the settings init adopts when it opens the port | |
1477 | * for the first time. | |
1da177e4 | 1478 | */ |
19225135 AC |
1479 | static void uart_update_termios(struct tty_struct *tty, |
1480 | struct uart_state *state) | |
1da177e4 | 1481 | { |
ebd2c8f6 | 1482 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
1483 | |
1484 | if (uart_console(port) && port->cons->cflag) { | |
1485 | tty->termios->c_cflag = port->cons->cflag; | |
1486 | port->cons->cflag = 0; | |
1487 | } | |
1488 | ||
1489 | /* | |
1490 | * If the device failed to grab its irq resources, | |
1491 | * or some other error occurred, don't try to talk | |
1492 | * to the port hardware. | |
1493 | */ | |
1494 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { | |
1495 | /* | |
1496 | * Make termios settings take effect. | |
1497 | */ | |
19225135 | 1498 | uart_change_speed(tty, state, NULL); |
1da177e4 LT |
1499 | |
1500 | /* | |
1501 | * And finally enable the RTS and DTR signals. | |
1502 | */ | |
1503 | if (tty->termios->c_cflag & CBAUD) | |
1504 | uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
1505 | } | |
1506 | } | |
1507 | ||
de0c8cb3 AC |
1508 | static int uart_carrier_raised(struct tty_port *port) |
1509 | { | |
1510 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1511 | struct uart_port *uport = state->uart_port; | |
1512 | int mctrl; | |
de0c8cb3 AC |
1513 | spin_lock_irq(&uport->lock); |
1514 | uport->ops->enable_ms(uport); | |
1515 | mctrl = uport->ops->get_mctrl(uport); | |
1516 | spin_unlock_irq(&uport->lock); | |
de0c8cb3 AC |
1517 | if (mctrl & TIOCM_CAR) |
1518 | return 1; | |
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | static void uart_dtr_rts(struct tty_port *port, int onoff) | |
1523 | { | |
1524 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1525 | struct uart_port *uport = state->uart_port; | |
24fcc7c8 | 1526 | |
3f582b8c | 1527 | if (onoff) { |
de0c8cb3 | 1528 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
3f582b8c AB |
1529 | |
1530 | /* | |
1531 | * If this is the first open to succeed, | |
1532 | * adjust things to suit. | |
1533 | */ | |
1534 | if (!test_and_set_bit(ASYNCB_NORMAL_ACTIVE, &port->flags)) | |
1535 | uart_update_termios(port->tty, state); | |
1536 | } | |
de0c8cb3 AC |
1537 | else |
1538 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); | |
de0c8cb3 AC |
1539 | } |
1540 | ||
1da177e4 LT |
1541 | static struct uart_state *uart_get(struct uart_driver *drv, int line) |
1542 | { | |
1543 | struct uart_state *state; | |
a2bceae0 | 1544 | struct tty_port *port; |
68ac64cd | 1545 | int ret = 0; |
1da177e4 | 1546 | |
1da177e4 | 1547 | state = drv->state + line; |
a2bceae0 AC |
1548 | port = &state->port; |
1549 | if (mutex_lock_interruptible(&port->mutex)) { | |
68ac64cd RK |
1550 | ret = -ERESTARTSYS; |
1551 | goto err; | |
1da177e4 LT |
1552 | } |
1553 | ||
a2bceae0 | 1554 | port->count++; |
ebd2c8f6 | 1555 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { |
68ac64cd RK |
1556 | ret = -ENXIO; |
1557 | goto err_unlock; | |
1da177e4 | 1558 | } |
1da177e4 | 1559 | return state; |
68ac64cd RK |
1560 | |
1561 | err_unlock: | |
a2bceae0 AC |
1562 | port->count--; |
1563 | mutex_unlock(&port->mutex); | |
68ac64cd RK |
1564 | err: |
1565 | return ERR_PTR(ret); | |
1da177e4 LT |
1566 | } |
1567 | ||
1568 | /* | |
922f9cfa DC |
1569 | * calls to uart_open are serialised by the BKL in |
1570 | * fs/char_dev.c:chrdev_open() | |
1da177e4 LT |
1571 | * Note that if this fails, then uart_close() _will_ be called. |
1572 | * | |
1573 | * In time, we want to scrap the "opening nonpresent ports" | |
1574 | * behaviour and implement an alternative way for setserial | |
1575 | * to set base addresses/ports/types. This will allow us to | |
1576 | * get rid of a certain amount of extra tests. | |
1577 | */ | |
1578 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1579 | { | |
1580 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1581 | struct uart_state *state; | |
91312cdb | 1582 | struct tty_port *port; |
1da177e4 LT |
1583 | int retval, line = tty->index; |
1584 | ||
ec79d605 | 1585 | BUG_ON(!tty_locked()); |
eb3a1e11 | 1586 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 LT |
1587 | |
1588 | /* | |
1589 | * tty->driver->num won't change, so we won't fail here with | |
1590 | * tty->driver_data set to something non-NULL (and therefore | |
1591 | * we won't get caught by uart_close()). | |
1592 | */ | |
1593 | retval = -ENODEV; | |
1594 | if (line >= tty->driver->num) | |
1595 | goto fail; | |
1596 | ||
1597 | /* | |
1598 | * We take the semaphore inside uart_get to guarantee that we won't | |
ebd2c8f6 | 1599 | * be re-entered while allocating the state structure, or while we |
1da177e4 LT |
1600 | * request any IRQs that the driver may need. This also has the nice |
1601 | * side-effect that it delays the action of uart_hangup, so we can | |
ebd2c8f6 AC |
1602 | * guarantee that state->port.tty will always contain something |
1603 | * reasonable. | |
1da177e4 LT |
1604 | */ |
1605 | state = uart_get(drv, line); | |
1606 | if (IS_ERR(state)) { | |
1607 | retval = PTR_ERR(state); | |
1608 | goto fail; | |
1609 | } | |
91312cdb | 1610 | port = &state->port; |
1da177e4 LT |
1611 | |
1612 | /* | |
1613 | * Once we set tty->driver_data here, we are guaranteed that | |
1614 | * uart_close() will decrement the driver module use count. | |
1615 | * Any failures from here onwards should not touch the count. | |
1616 | */ | |
1617 | tty->driver_data = state; | |
ebd2c8f6 AC |
1618 | state->uart_port->state = state; |
1619 | tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
1da177e4 | 1620 | tty->alt_speed = 0; |
7b01478f | 1621 | tty_port_tty_set(port, tty); |
1da177e4 LT |
1622 | |
1623 | /* | |
1624 | * If the port is in the middle of closing, bail out now. | |
1625 | */ | |
1626 | if (tty_hung_up_p(filp)) { | |
1627 | retval = -EAGAIN; | |
91312cdb | 1628 | port->count--; |
a2bceae0 | 1629 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1630 | goto fail; |
1631 | } | |
1632 | ||
1633 | /* | |
1634 | * Make sure the device is in D0 state. | |
1635 | */ | |
91312cdb | 1636 | if (port->count == 1) |
1da177e4 LT |
1637 | uart_change_pm(state, 0); |
1638 | ||
1639 | /* | |
1640 | * Start up the serial port. | |
1641 | */ | |
19225135 | 1642 | retval = uart_startup(tty, state, 0); |
1da177e4 LT |
1643 | |
1644 | /* | |
1645 | * If we succeeded, wait until the port is ready. | |
1646 | */ | |
61cd8a21 | 1647 | mutex_unlock(&port->mutex); |
1da177e4 | 1648 | if (retval == 0) |
74c21077 | 1649 | retval = tty_port_block_til_ready(port, tty, filp); |
1da177e4 | 1650 | |
a2bceae0 | 1651 | fail: |
1da177e4 LT |
1652 | return retval; |
1653 | } | |
1654 | ||
1655 | static const char *uart_type(struct uart_port *port) | |
1656 | { | |
1657 | const char *str = NULL; | |
1658 | ||
1659 | if (port->ops->type) | |
1660 | str = port->ops->type(port); | |
1661 | ||
1662 | if (!str) | |
1663 | str = "unknown"; | |
1664 | ||
1665 | return str; | |
1666 | } | |
1667 | ||
1668 | #ifdef CONFIG_PROC_FS | |
1669 | ||
d196a949 | 1670 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1da177e4 LT |
1671 | { |
1672 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 1673 | struct tty_port *port = &state->port; |
3689a0ec | 1674 | int pm_state; |
a2bceae0 | 1675 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
1676 | char stat_buf[32]; |
1677 | unsigned int status; | |
d196a949 | 1678 | int mmio; |
1da177e4 | 1679 | |
a2bceae0 | 1680 | if (!uport) |
d196a949 | 1681 | return; |
1da177e4 | 1682 | |
a2bceae0 | 1683 | mmio = uport->iotype >= UPIO_MEM; |
d196a949 | 1684 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
a2bceae0 | 1685 | uport->line, uart_type(uport), |
6c6a2334 | 1686 | mmio ? "mmio:0x" : "port:", |
a2bceae0 AC |
1687 | mmio ? (unsigned long long)uport->mapbase |
1688 | : (unsigned long long)uport->iobase, | |
1689 | uport->irq); | |
1da177e4 | 1690 | |
a2bceae0 | 1691 | if (uport->type == PORT_UNKNOWN) { |
d196a949 AD |
1692 | seq_putc(m, '\n'); |
1693 | return; | |
1da177e4 LT |
1694 | } |
1695 | ||
a46c9994 | 1696 | if (capable(CAP_SYS_ADMIN)) { |
a2bceae0 | 1697 | mutex_lock(&port->mutex); |
3689a0ec GD |
1698 | pm_state = state->pm_state; |
1699 | if (pm_state) | |
1700 | uart_change_pm(state, 0); | |
a2bceae0 AC |
1701 | spin_lock_irq(&uport->lock); |
1702 | status = uport->ops->get_mctrl(uport); | |
1703 | spin_unlock_irq(&uport->lock); | |
3689a0ec GD |
1704 | if (pm_state) |
1705 | uart_change_pm(state, pm_state); | |
a2bceae0 | 1706 | mutex_unlock(&port->mutex); |
1da177e4 | 1707 | |
d196a949 | 1708 | seq_printf(m, " tx:%d rx:%d", |
a2bceae0 AC |
1709 | uport->icount.tx, uport->icount.rx); |
1710 | if (uport->icount.frame) | |
d196a949 | 1711 | seq_printf(m, " fe:%d", |
a2bceae0 AC |
1712 | uport->icount.frame); |
1713 | if (uport->icount.parity) | |
d196a949 | 1714 | seq_printf(m, " pe:%d", |
a2bceae0 AC |
1715 | uport->icount.parity); |
1716 | if (uport->icount.brk) | |
d196a949 | 1717 | seq_printf(m, " brk:%d", |
a2bceae0 AC |
1718 | uport->icount.brk); |
1719 | if (uport->icount.overrun) | |
d196a949 | 1720 | seq_printf(m, " oe:%d", |
a2bceae0 | 1721 | uport->icount.overrun); |
a46c9994 AC |
1722 | |
1723 | #define INFOBIT(bit, str) \ | |
a2bceae0 | 1724 | if (uport->mctrl & (bit)) \ |
1da177e4 LT |
1725 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1726 | strlen(stat_buf) - 2) | |
a46c9994 | 1727 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1728 | if (status & (bit)) \ |
1729 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1730 | strlen(stat_buf) - 2) | |
1731 | ||
1732 | stat_buf[0] = '\0'; | |
1733 | stat_buf[1] = '\0'; | |
1734 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1735 | STATBIT(TIOCM_CTS, "|CTS"); | |
1736 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1737 | STATBIT(TIOCM_DSR, "|DSR"); | |
1738 | STATBIT(TIOCM_CAR, "|CD"); | |
1739 | STATBIT(TIOCM_RNG, "|RI"); | |
1740 | if (stat_buf[0]) | |
1741 | stat_buf[0] = ' '; | |
a46c9994 | 1742 | |
d196a949 | 1743 | seq_puts(m, stat_buf); |
1da177e4 | 1744 | } |
d196a949 | 1745 | seq_putc(m, '\n'); |
1da177e4 LT |
1746 | #undef STATBIT |
1747 | #undef INFOBIT | |
1da177e4 LT |
1748 | } |
1749 | ||
d196a949 | 1750 | static int uart_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1751 | { |
833bb304 | 1752 | struct tty_driver *ttydrv = m->private; |
1da177e4 | 1753 | struct uart_driver *drv = ttydrv->driver_state; |
d196a949 | 1754 | int i; |
1da177e4 | 1755 | |
d196a949 | 1756 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
1da177e4 | 1757 | "", "", ""); |
d196a949 AD |
1758 | for (i = 0; i < drv->nr; i++) |
1759 | uart_line_info(m, drv, i); | |
1760 | return 0; | |
1da177e4 | 1761 | } |
d196a949 AD |
1762 | |
1763 | static int uart_proc_open(struct inode *inode, struct file *file) | |
1764 | { | |
1765 | return single_open(file, uart_proc_show, PDE(inode)->data); | |
1766 | } | |
1767 | ||
1768 | static const struct file_operations uart_proc_fops = { | |
1769 | .owner = THIS_MODULE, | |
1770 | .open = uart_proc_open, | |
1771 | .read = seq_read, | |
1772 | .llseek = seq_lseek, | |
1773 | .release = single_release, | |
1774 | }; | |
1da177e4 LT |
1775 | #endif |
1776 | ||
4a1b5502 | 1777 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1778 | /* |
1779 | * uart_console_write - write a console message to a serial port | |
1780 | * @port: the port to write the message | |
1781 | * @s: array of characters | |
1782 | * @count: number of characters in string to write | |
1783 | * @write: function to write character to port | |
1784 | */ | |
1785 | void uart_console_write(struct uart_port *port, const char *s, | |
1786 | unsigned int count, | |
1787 | void (*putchar)(struct uart_port *, int)) | |
1788 | { | |
1789 | unsigned int i; | |
1790 | ||
1791 | for (i = 0; i < count; i++, s++) { | |
1792 | if (*s == '\n') | |
1793 | putchar(port, '\r'); | |
1794 | putchar(port, *s); | |
1795 | } | |
1796 | } | |
1797 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1798 | ||
1da177e4 LT |
1799 | /* |
1800 | * Check whether an invalid uart number has been specified, and | |
1801 | * if so, search for the first available port that does have | |
1802 | * console support. | |
1803 | */ | |
1804 | struct uart_port * __init | |
1805 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1806 | { | |
1807 | int idx = co->index; | |
1808 | ||
1809 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1810 | ports[idx].membase == NULL)) | |
1811 | for (idx = 0; idx < nr; idx++) | |
1812 | if (ports[idx].iobase != 0 || | |
1813 | ports[idx].membase != NULL) | |
1814 | break; | |
1815 | ||
1816 | co->index = idx; | |
1817 | ||
1818 | return ports + idx; | |
1819 | } | |
1820 | ||
1821 | /** | |
1822 | * uart_parse_options - Parse serial port baud/parity/bits/flow contro. | |
1823 | * @options: pointer to option string | |
1824 | * @baud: pointer to an 'int' variable for the baud rate. | |
1825 | * @parity: pointer to an 'int' variable for the parity. | |
1826 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1827 | * @flow: pointer to an 'int' variable for the flow control character. | |
1828 | * | |
1829 | * uart_parse_options decodes a string containing the serial console | |
1830 | * options. The format of the string is <baud><parity><bits><flow>, | |
1831 | * eg: 115200n8r | |
1832 | */ | |
f2d937f3 | 1833 | void |
1da177e4 LT |
1834 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1835 | { | |
1836 | char *s = options; | |
1837 | ||
1838 | *baud = simple_strtoul(s, NULL, 10); | |
1839 | while (*s >= '0' && *s <= '9') | |
1840 | s++; | |
1841 | if (*s) | |
1842 | *parity = *s++; | |
1843 | if (*s) | |
1844 | *bits = *s++ - '0'; | |
1845 | if (*s) | |
1846 | *flow = *s; | |
1847 | } | |
f2d937f3 | 1848 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1849 | |
1850 | struct baud_rates { | |
1851 | unsigned int rate; | |
1852 | unsigned int cflag; | |
1853 | }; | |
1854 | ||
cb3592be | 1855 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1856 | { 921600, B921600 }, |
1857 | { 460800, B460800 }, | |
1858 | { 230400, B230400 }, | |
1859 | { 115200, B115200 }, | |
1860 | { 57600, B57600 }, | |
1861 | { 38400, B38400 }, | |
1862 | { 19200, B19200 }, | |
1863 | { 9600, B9600 }, | |
1864 | { 4800, B4800 }, | |
1865 | { 2400, B2400 }, | |
1866 | { 1200, B1200 }, | |
1867 | { 0, B38400 } | |
1868 | }; | |
1869 | ||
1870 | /** | |
1871 | * uart_set_options - setup the serial console parameters | |
1872 | * @port: pointer to the serial ports uart_port structure | |
1873 | * @co: console pointer | |
1874 | * @baud: baud rate | |
1875 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1876 | * @bits: number of data bits | |
1877 | * @flow: flow control character - 'r' (rts) | |
1878 | */ | |
f2d937f3 | 1879 | int |
1da177e4 LT |
1880 | uart_set_options(struct uart_port *port, struct console *co, |
1881 | int baud, int parity, int bits, int flow) | |
1882 | { | |
606d099c | 1883 | struct ktermios termios; |
149b36ea | 1884 | static struct ktermios dummy; |
1da177e4 LT |
1885 | int i; |
1886 | ||
976ecd12 RK |
1887 | /* |
1888 | * Ensure that the serial console lock is initialised | |
1889 | * early. | |
1890 | */ | |
1891 | spin_lock_init(&port->lock); | |
13e83599 | 1892 | lockdep_set_class(&port->lock, &port_lock_key); |
976ecd12 | 1893 | |
606d099c | 1894 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1895 | |
1896 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1897 | ||
1898 | /* | |
1899 | * Construct a cflag setting. | |
1900 | */ | |
1901 | for (i = 0; baud_rates[i].rate; i++) | |
1902 | if (baud_rates[i].rate <= baud) | |
1903 | break; | |
1904 | ||
1905 | termios.c_cflag |= baud_rates[i].cflag; | |
1906 | ||
1907 | if (bits == 7) | |
1908 | termios.c_cflag |= CS7; | |
1909 | else | |
1910 | termios.c_cflag |= CS8; | |
1911 | ||
1912 | switch (parity) { | |
1913 | case 'o': case 'O': | |
1914 | termios.c_cflag |= PARODD; | |
1915 | /*fall through*/ | |
1916 | case 'e': case 'E': | |
1917 | termios.c_cflag |= PARENB; | |
1918 | break; | |
1919 | } | |
1920 | ||
1921 | if (flow == 'r') | |
1922 | termios.c_cflag |= CRTSCTS; | |
1923 | ||
79492689 YL |
1924 | /* |
1925 | * some uarts on other side don't support no flow control. | |
1926 | * So we set * DTR in host uart to make them happy | |
1927 | */ | |
1928 | port->mctrl |= TIOCM_DTR; | |
1929 | ||
149b36ea | 1930 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1931 | /* |
1932 | * Allow the setting of the UART parameters with a NULL console | |
1933 | * too: | |
1934 | */ | |
1935 | if (co) | |
1936 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1937 | |
1938 | return 0; | |
1939 | } | |
f2d937f3 | 1940 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1941 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1942 | ||
1943 | static void uart_change_pm(struct uart_state *state, int pm_state) | |
1944 | { | |
ebd2c8f6 | 1945 | struct uart_port *port = state->uart_port; |
1281e360 AV |
1946 | |
1947 | if (state->pm_state != pm_state) { | |
1948 | if (port->ops->pm) | |
1949 | port->ops->pm(port, pm_state, state->pm_state); | |
1950 | state->pm_state = pm_state; | |
1951 | } | |
1da177e4 LT |
1952 | } |
1953 | ||
b3b708fa GL |
1954 | struct uart_match { |
1955 | struct uart_port *port; | |
1956 | struct uart_driver *driver; | |
1957 | }; | |
1958 | ||
1959 | static int serial_match_port(struct device *dev, void *data) | |
1960 | { | |
1961 | struct uart_match *match = data; | |
7ca796f4 GL |
1962 | struct tty_driver *tty_drv = match->driver->tty_driver; |
1963 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
1964 | match->port->line; | |
b3b708fa GL |
1965 | |
1966 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1967 | } | |
1968 | ||
ccce6deb | 1969 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1970 | { |
ccce6deb AC |
1971 | struct uart_state *state = drv->state + uport->line; |
1972 | struct tty_port *port = &state->port; | |
b3b708fa | 1973 | struct device *tty_dev; |
ccce6deb | 1974 | struct uart_match match = {uport, drv}; |
19225135 | 1975 | struct tty_struct *tty; |
1da177e4 | 1976 | |
a2bceae0 | 1977 | mutex_lock(&port->mutex); |
1da177e4 | 1978 | |
19225135 AC |
1979 | /* Must be inside the mutex lock until we convert to tty_port */ |
1980 | tty = port->tty; | |
1981 | ||
ccce6deb | 1982 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
b3b708fa | 1983 | if (device_may_wakeup(tty_dev)) { |
3f960dbb G |
1984 | if (!enable_irq_wake(uport->irq)) |
1985 | uport->irq_wake = 1; | |
b3b708fa | 1986 | put_device(tty_dev); |
a2bceae0 | 1987 | mutex_unlock(&port->mutex); |
b3b708fa GL |
1988 | return 0; |
1989 | } | |
4547be78 SB |
1990 | if (console_suspend_enabled || !uart_console(uport)) |
1991 | uport->suspended = 1; | |
b3b708fa | 1992 | |
ccce6deb AC |
1993 | if (port->flags & ASYNC_INITIALIZED) { |
1994 | const struct uart_ops *ops = uport->ops; | |
c8c6bfa3 | 1995 | int tries; |
1da177e4 | 1996 | |
4547be78 SB |
1997 | if (console_suspend_enabled || !uart_console(uport)) { |
1998 | set_bit(ASYNCB_SUSPENDED, &port->flags); | |
1999 | clear_bit(ASYNCB_INITIALIZED, &port->flags); | |
a6b93a90 | 2000 | |
4547be78 SB |
2001 | spin_lock_irq(&uport->lock); |
2002 | ops->stop_tx(uport); | |
2003 | ops->set_mctrl(uport, 0); | |
2004 | ops->stop_rx(uport); | |
2005 | spin_unlock_irq(&uport->lock); | |
2006 | } | |
1da177e4 LT |
2007 | |
2008 | /* | |
2009 | * Wait for the transmitter to empty. | |
2010 | */ | |
ccce6deb | 2011 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
1da177e4 | 2012 | msleep(10); |
c8c6bfa3 | 2013 | if (!tries) |
a46c9994 AC |
2014 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
2015 | "transmitter\n", | |
ccce6deb AC |
2016 | uport->dev ? dev_name(uport->dev) : "", |
2017 | uport->dev ? ": " : "", | |
8440838b | 2018 | drv->dev_name, |
ccce6deb | 2019 | drv->tty_driver->name_base + uport->line); |
1da177e4 | 2020 | |
4547be78 SB |
2021 | if (console_suspend_enabled || !uart_console(uport)) |
2022 | ops->shutdown(uport); | |
1da177e4 LT |
2023 | } |
2024 | ||
2025 | /* | |
2026 | * Disable the console device before suspending. | |
2027 | */ | |
4547be78 | 2028 | if (console_suspend_enabled && uart_console(uport)) |
ccce6deb | 2029 | console_stop(uport->cons); |
1da177e4 | 2030 | |
4547be78 SB |
2031 | if (console_suspend_enabled || !uart_console(uport)) |
2032 | uart_change_pm(state, 3); | |
1da177e4 | 2033 | |
a2bceae0 | 2034 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2035 | |
2036 | return 0; | |
2037 | } | |
2038 | ||
ccce6deb | 2039 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2040 | { |
ccce6deb AC |
2041 | struct uart_state *state = drv->state + uport->line; |
2042 | struct tty_port *port = &state->port; | |
03a74dcc | 2043 | struct device *tty_dev; |
ccce6deb | 2044 | struct uart_match match = {uport, drv}; |
ba15ab0e | 2045 | struct ktermios termios; |
1da177e4 | 2046 | |
a2bceae0 | 2047 | mutex_lock(&port->mutex); |
1da177e4 | 2048 | |
ccce6deb AC |
2049 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
2050 | if (!uport->suspended && device_may_wakeup(tty_dev)) { | |
3f960dbb G |
2051 | if (uport->irq_wake) { |
2052 | disable_irq_wake(uport->irq); | |
2053 | uport->irq_wake = 0; | |
2054 | } | |
a2bceae0 | 2055 | mutex_unlock(&port->mutex); |
b3b708fa GL |
2056 | return 0; |
2057 | } | |
ccce6deb | 2058 | uport->suspended = 0; |
b3b708fa | 2059 | |
1da177e4 LT |
2060 | /* |
2061 | * Re-enable the console device after suspending. | |
2062 | */ | |
5933a161 | 2063 | if (uart_console(uport)) { |
891b9dd1 JW |
2064 | /* |
2065 | * First try to use the console cflag setting. | |
2066 | */ | |
2067 | memset(&termios, 0, sizeof(struct ktermios)); | |
2068 | termios.c_cflag = uport->cons->cflag; | |
2069 | ||
2070 | /* | |
2071 | * If that's unset, use the tty termios setting. | |
2072 | */ | |
2073 | if (port->tty && port->tty->termios && termios.c_cflag == 0) | |
2074 | termios = *(port->tty->termios); | |
2075 | ||
ccce6deb | 2076 | uport->ops->set_termios(uport, &termios, NULL); |
5933a161 YK |
2077 | if (console_suspend_enabled) |
2078 | console_start(uport->cons); | |
1da177e4 LT |
2079 | } |
2080 | ||
ccce6deb AC |
2081 | if (port->flags & ASYNC_SUSPENDED) { |
2082 | const struct uart_ops *ops = uport->ops; | |
ee31b337 | 2083 | int ret; |
1da177e4 | 2084 | |
9d778a69 | 2085 | uart_change_pm(state, 0); |
ccce6deb AC |
2086 | spin_lock_irq(&uport->lock); |
2087 | ops->set_mctrl(uport, 0); | |
2088 | spin_unlock_irq(&uport->lock); | |
4547be78 | 2089 | if (console_suspend_enabled || !uart_console(uport)) { |
19225135 AC |
2090 | /* Protected by port mutex for now */ |
2091 | struct tty_struct *tty = port->tty; | |
4547be78 SB |
2092 | ret = ops->startup(uport); |
2093 | if (ret == 0) { | |
19225135 AC |
2094 | if (tty) |
2095 | uart_change_speed(tty, state, NULL); | |
4547be78 SB |
2096 | spin_lock_irq(&uport->lock); |
2097 | ops->set_mctrl(uport, uport->mctrl); | |
2098 | ops->start_tx(uport); | |
2099 | spin_unlock_irq(&uport->lock); | |
2100 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
2101 | } else { | |
2102 | /* | |
2103 | * Failed to resume - maybe hardware went away? | |
2104 | * Clear the "initialized" flag so we won't try | |
2105 | * to call the low level drivers shutdown method. | |
2106 | */ | |
19225135 | 2107 | uart_shutdown(tty, state); |
4547be78 | 2108 | } |
ee31b337 | 2109 | } |
a6b93a90 | 2110 | |
ccce6deb | 2111 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
2112 | } |
2113 | ||
a2bceae0 | 2114 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2115 | |
2116 | return 0; | |
2117 | } | |
2118 | ||
2119 | static inline void | |
2120 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2121 | { | |
30b7a3bc RK |
2122 | char address[64]; |
2123 | ||
1da177e4 LT |
2124 | switch (port->iotype) { |
2125 | case UPIO_PORT: | |
9bde10a4 | 2126 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2127 | break; |
2128 | case UPIO_HUB6: | |
30b7a3bc | 2129 | snprintf(address, sizeof(address), |
9bde10a4 | 2130 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2131 | break; |
2132 | case UPIO_MEM: | |
2133 | case UPIO_MEM32: | |
21c614a7 | 2134 | case UPIO_AU: |
3be91ec7 | 2135 | case UPIO_TSI: |
beab697a | 2136 | case UPIO_DWAPB: |
a3ae0fc3 | 2137 | case UPIO_DWAPB32: |
30b7a3bc | 2138 | snprintf(address, sizeof(address), |
4f640efb | 2139 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2140 | break; |
2141 | default: | |
2142 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2143 | break; |
2144 | } | |
30b7a3bc | 2145 | |
0cf669d5 | 2146 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", |
4bfe090b | 2147 | port->dev ? dev_name(port->dev) : "", |
0cf669d5 | 2148 | port->dev ? ": " : "", |
8440838b DM |
2149 | drv->dev_name, |
2150 | drv->tty_driver->name_base + port->line, | |
2151 | address, port->irq, uart_type(port)); | |
1da177e4 LT |
2152 | } |
2153 | ||
2154 | static void | |
2155 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2156 | struct uart_port *port) | |
2157 | { | |
2158 | unsigned int flags; | |
2159 | ||
2160 | /* | |
2161 | * If there isn't a port here, don't do anything further. | |
2162 | */ | |
2163 | if (!port->iobase && !port->mapbase && !port->membase) | |
2164 | return; | |
2165 | ||
2166 | /* | |
2167 | * Now do the auto configuration stuff. Note that config_port | |
2168 | * is expected to claim the resources and map the port for us. | |
2169 | */ | |
8e23fcc8 | 2170 | flags = 0; |
1da177e4 LT |
2171 | if (port->flags & UPF_AUTO_IRQ) |
2172 | flags |= UART_CONFIG_IRQ; | |
2173 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2174 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2175 | port->type = PORT_UNKNOWN; | |
2176 | flags |= UART_CONFIG_TYPE; | |
2177 | } | |
1da177e4 LT |
2178 | port->ops->config_port(port, flags); |
2179 | } | |
2180 | ||
2181 | if (port->type != PORT_UNKNOWN) { | |
2182 | unsigned long flags; | |
2183 | ||
2184 | uart_report_port(drv, port); | |
2185 | ||
3689a0ec GD |
2186 | /* Power up port for set_mctrl() */ |
2187 | uart_change_pm(state, 0); | |
2188 | ||
1da177e4 LT |
2189 | /* |
2190 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2191 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2192 | * We probably don't need a spinlock around this, but |
2193 | */ | |
2194 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2195 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2196 | spin_unlock_irqrestore(&port->lock, flags); |
2197 | ||
97d97224 RK |
2198 | /* |
2199 | * If this driver supports console, and it hasn't been | |
2200 | * successfully registered yet, try to re-register it. | |
2201 | * It may be that the port was not available. | |
2202 | */ | |
2203 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2204 | register_console(port->cons); | |
2205 | ||
1da177e4 LT |
2206 | /* |
2207 | * Power down all ports by default, except the | |
2208 | * console if we have one. | |
2209 | */ | |
2210 | if (!uart_console(port)) | |
2211 | uart_change_pm(state, 3); | |
2212 | } | |
2213 | } | |
2214 | ||
f2d937f3 JW |
2215 | #ifdef CONFIG_CONSOLE_POLL |
2216 | ||
2217 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2218 | { | |
2219 | struct uart_driver *drv = driver->driver_state; | |
2220 | struct uart_state *state = drv->state + line; | |
2221 | struct uart_port *port; | |
2222 | int baud = 9600; | |
2223 | int bits = 8; | |
2224 | int parity = 'n'; | |
2225 | int flow = 'n'; | |
2226 | ||
ebd2c8f6 | 2227 | if (!state || !state->uart_port) |
f2d937f3 JW |
2228 | return -1; |
2229 | ||
ebd2c8f6 | 2230 | port = state->uart_port; |
f2d937f3 JW |
2231 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
2232 | return -1; | |
2233 | ||
2234 | if (options) { | |
2235 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2236 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2237 | } | |
2238 | ||
2239 | return 0; | |
2240 | } | |
2241 | ||
2242 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2243 | { | |
2244 | struct uart_driver *drv = driver->driver_state; | |
2245 | struct uart_state *state = drv->state + line; | |
2246 | struct uart_port *port; | |
2247 | ||
ebd2c8f6 | 2248 | if (!state || !state->uart_port) |
f2d937f3 JW |
2249 | return -1; |
2250 | ||
ebd2c8f6 | 2251 | port = state->uart_port; |
f2d937f3 JW |
2252 | return port->ops->poll_get_char(port); |
2253 | } | |
2254 | ||
2255 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2256 | { | |
2257 | struct uart_driver *drv = driver->driver_state; | |
2258 | struct uart_state *state = drv->state + line; | |
2259 | struct uart_port *port; | |
2260 | ||
ebd2c8f6 | 2261 | if (!state || !state->uart_port) |
f2d937f3 JW |
2262 | return; |
2263 | ||
ebd2c8f6 | 2264 | port = state->uart_port; |
f2d937f3 JW |
2265 | port->ops->poll_put_char(port, ch); |
2266 | } | |
2267 | #endif | |
2268 | ||
b68e31d0 | 2269 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2270 | .open = uart_open, |
2271 | .close = uart_close, | |
2272 | .write = uart_write, | |
2273 | .put_char = uart_put_char, | |
2274 | .flush_chars = uart_flush_chars, | |
2275 | .write_room = uart_write_room, | |
2276 | .chars_in_buffer= uart_chars_in_buffer, | |
2277 | .flush_buffer = uart_flush_buffer, | |
2278 | .ioctl = uart_ioctl, | |
2279 | .throttle = uart_throttle, | |
2280 | .unthrottle = uart_unthrottle, | |
2281 | .send_xchar = uart_send_xchar, | |
2282 | .set_termios = uart_set_termios, | |
64e9159f | 2283 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2284 | .stop = uart_stop, |
2285 | .start = uart_start, | |
2286 | .hangup = uart_hangup, | |
2287 | .break_ctl = uart_break_ctl, | |
2288 | .wait_until_sent= uart_wait_until_sent, | |
2289 | #ifdef CONFIG_PROC_FS | |
d196a949 | 2290 | .proc_fops = &uart_proc_fops, |
1da177e4 LT |
2291 | #endif |
2292 | .tiocmget = uart_tiocmget, | |
2293 | .tiocmset = uart_tiocmset, | |
d281da7f | 2294 | .get_icount = uart_get_icount, |
f2d937f3 JW |
2295 | #ifdef CONFIG_CONSOLE_POLL |
2296 | .poll_init = uart_poll_init, | |
2297 | .poll_get_char = uart_poll_get_char, | |
2298 | .poll_put_char = uart_poll_put_char, | |
2299 | #endif | |
1da177e4 LT |
2300 | }; |
2301 | ||
de0c8cb3 AC |
2302 | static const struct tty_port_operations uart_port_ops = { |
2303 | .carrier_raised = uart_carrier_raised, | |
2304 | .dtr_rts = uart_dtr_rts, | |
2305 | }; | |
2306 | ||
1da177e4 LT |
2307 | /** |
2308 | * uart_register_driver - register a driver with the uart core layer | |
2309 | * @drv: low level driver structure | |
2310 | * | |
2311 | * Register a uart driver with the core driver. We in turn register | |
2312 | * with the tty layer, and initialise the core driver per-port state. | |
2313 | * | |
2314 | * We have a proc file in /proc/tty/driver which is named after the | |
2315 | * normal driver. | |
2316 | * | |
2317 | * drv->port should be NULL, and the per-port structures should be | |
2318 | * registered using uart_add_one_port after this call has succeeded. | |
2319 | */ | |
2320 | int uart_register_driver(struct uart_driver *drv) | |
2321 | { | |
9e845abf | 2322 | struct tty_driver *normal; |
1da177e4 LT |
2323 | int i, retval; |
2324 | ||
2325 | BUG_ON(drv->state); | |
2326 | ||
2327 | /* | |
2328 | * Maybe we should be using a slab cache for this, especially if | |
2329 | * we have a large number of ports to handle. | |
2330 | */ | |
8f31bb39 | 2331 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2332 | if (!drv->state) |
2333 | goto out; | |
2334 | ||
9e845abf | 2335 | normal = alloc_tty_driver(drv->nr); |
1da177e4 | 2336 | if (!normal) |
9e845abf | 2337 | goto out_kfree; |
1da177e4 LT |
2338 | |
2339 | drv->tty_driver = normal; | |
2340 | ||
2341 | normal->owner = drv->owner; | |
2342 | normal->driver_name = drv->driver_name; | |
1da177e4 LT |
2343 | normal->name = drv->dev_name; |
2344 | normal->major = drv->major; | |
2345 | normal->minor_start = drv->minor; | |
2346 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2347 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2348 | normal->init_termios = tty_std_termios; | |
2349 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2350 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2351 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2352 | normal->driver_state = drv; |
2353 | tty_set_operations(normal, &uart_ops); | |
2354 | ||
2355 | /* | |
2356 | * Initialise the UART state(s). | |
2357 | */ | |
2358 | for (i = 0; i < drv->nr; i++) { | |
2359 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 2360 | struct tty_port *port = &state->port; |
1da177e4 | 2361 | |
a2bceae0 | 2362 | tty_port_init(port); |
de0c8cb3 | 2363 | port->ops = &uart_port_ops; |
a2bceae0 AC |
2364 | port->close_delay = 500; /* .5 seconds */ |
2365 | port->closing_wait = 30000; /* 30 seconds */ | |
ebd2c8f6 | 2366 | tasklet_init(&state->tlet, uart_tasklet_action, |
f751928e | 2367 | (unsigned long)state); |
1da177e4 LT |
2368 | } |
2369 | ||
2370 | retval = tty_register_driver(normal); | |
9e845abf AGR |
2371 | if (retval >= 0) |
2372 | return retval; | |
2373 | ||
2374 | put_tty_driver(normal); | |
2375 | out_kfree: | |
2376 | kfree(drv->state); | |
2377 | out: | |
2378 | return -ENOMEM; | |
1da177e4 LT |
2379 | } |
2380 | ||
2381 | /** | |
2382 | * uart_unregister_driver - remove a driver from the uart core layer | |
2383 | * @drv: low level driver structure | |
2384 | * | |
2385 | * Remove all references to a driver from the core driver. The low | |
2386 | * level driver must have removed all its ports via the | |
2387 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2388 | * (ie, drv->port == NULL) | |
2389 | */ | |
2390 | void uart_unregister_driver(struct uart_driver *drv) | |
2391 | { | |
2392 | struct tty_driver *p = drv->tty_driver; | |
2393 | tty_unregister_driver(p); | |
2394 | put_tty_driver(p); | |
2395 | kfree(drv->state); | |
2396 | drv->tty_driver = NULL; | |
2397 | } | |
2398 | ||
2399 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2400 | { | |
2401 | struct uart_driver *p = co->data; | |
2402 | *index = co->index; | |
2403 | return p->tty_driver; | |
2404 | } | |
2405 | ||
2406 | /** | |
2407 | * uart_add_one_port - attach a driver-defined port structure | |
2408 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2409 | * @uport: uart port structure to use for this port. |
1da177e4 LT |
2410 | * |
2411 | * This allows the driver to register its own uart_port structure | |
2412 | * with the core driver. The main purpose is to allow the low | |
2413 | * level uart drivers to expand uart_port, rather than having yet | |
2414 | * more levels of structures. | |
2415 | */ | |
a2bceae0 | 2416 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 LT |
2417 | { |
2418 | struct uart_state *state; | |
a2bceae0 | 2419 | struct tty_port *port; |
1da177e4 | 2420 | int ret = 0; |
b3b708fa | 2421 | struct device *tty_dev; |
1da177e4 LT |
2422 | |
2423 | BUG_ON(in_interrupt()); | |
2424 | ||
a2bceae0 | 2425 | if (uport->line >= drv->nr) |
1da177e4 LT |
2426 | return -EINVAL; |
2427 | ||
a2bceae0 AC |
2428 | state = drv->state + uport->line; |
2429 | port = &state->port; | |
1da177e4 | 2430 | |
f392ecfa | 2431 | mutex_lock(&port_mutex); |
a2bceae0 | 2432 | mutex_lock(&port->mutex); |
ebd2c8f6 | 2433 | if (state->uart_port) { |
1da177e4 LT |
2434 | ret = -EINVAL; |
2435 | goto out; | |
2436 | } | |
2437 | ||
a2bceae0 | 2438 | state->uart_port = uport; |
97d97224 | 2439 | state->pm_state = -1; |
1da177e4 | 2440 | |
a2bceae0 AC |
2441 | uport->cons = drv->cons; |
2442 | uport->state = state; | |
1da177e4 | 2443 | |
976ecd12 RK |
2444 | /* |
2445 | * If this port is a console, then the spinlock is already | |
2446 | * initialised. | |
2447 | */ | |
a2bceae0 AC |
2448 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
2449 | spin_lock_init(&uport->lock); | |
2450 | lockdep_set_class(&uport->lock, &port_lock_key); | |
13e83599 | 2451 | } |
976ecd12 | 2452 | |
a2bceae0 | 2453 | uart_configure_port(drv, state, uport); |
1da177e4 LT |
2454 | |
2455 | /* | |
2456 | * Register the port whether it's detected or not. This allows | |
2457 | * setserial to be used to alter this ports parameters. | |
2458 | */ | |
a2bceae0 | 2459 | tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev); |
b3b708fa | 2460 | if (likely(!IS_ERR(tty_dev))) { |
74081f86 | 2461 | device_init_wakeup(tty_dev, 1); |
b3b708fa GL |
2462 | device_set_wakeup_enable(tty_dev, 0); |
2463 | } else | |
2464 | printk(KERN_ERR "Cannot register tty device on line %d\n", | |
a2bceae0 | 2465 | uport->line); |
1da177e4 | 2466 | |
68ac64cd RK |
2467 | /* |
2468 | * Ensure UPF_DEAD is not set. | |
2469 | */ | |
a2bceae0 | 2470 | uport->flags &= ~UPF_DEAD; |
68ac64cd | 2471 | |
1da177e4 | 2472 | out: |
a2bceae0 | 2473 | mutex_unlock(&port->mutex); |
f392ecfa | 2474 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2475 | |
2476 | return ret; | |
2477 | } | |
2478 | ||
2479 | /** | |
2480 | * uart_remove_one_port - detach a driver defined port structure | |
2481 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2482 | * @uport: uart port structure for this port |
1da177e4 LT |
2483 | * |
2484 | * This unhooks (and hangs up) the specified port structure from the | |
2485 | * core driver. No further calls will be made to the low-level code | |
2486 | * for this port. | |
2487 | */ | |
a2bceae0 | 2488 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2489 | { |
a2bceae0 AC |
2490 | struct uart_state *state = drv->state + uport->line; |
2491 | struct tty_port *port = &state->port; | |
1da177e4 LT |
2492 | |
2493 | BUG_ON(in_interrupt()); | |
2494 | ||
a2bceae0 | 2495 | if (state->uart_port != uport) |
1da177e4 | 2496 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
a2bceae0 | 2497 | state->uart_port, uport); |
1da177e4 | 2498 | |
f392ecfa | 2499 | mutex_lock(&port_mutex); |
1da177e4 | 2500 | |
68ac64cd RK |
2501 | /* |
2502 | * Mark the port "dead" - this prevents any opens from | |
2503 | * succeeding while we shut down the port. | |
2504 | */ | |
a2bceae0 AC |
2505 | mutex_lock(&port->mutex); |
2506 | uport->flags |= UPF_DEAD; | |
2507 | mutex_unlock(&port->mutex); | |
68ac64cd | 2508 | |
1da177e4 | 2509 | /* |
aa4148cf | 2510 | * Remove the devices from the tty layer |
1da177e4 | 2511 | */ |
a2bceae0 | 2512 | tty_unregister_device(drv->tty_driver, uport->line); |
1da177e4 | 2513 | |
a2bceae0 AC |
2514 | if (port->tty) |
2515 | tty_vhangup(port->tty); | |
68ac64cd | 2516 | |
68ac64cd RK |
2517 | /* |
2518 | * Free the port IO and memory resources, if any. | |
2519 | */ | |
a2bceae0 AC |
2520 | if (uport->type != PORT_UNKNOWN) |
2521 | uport->ops->release_port(uport); | |
68ac64cd RK |
2522 | |
2523 | /* | |
2524 | * Indicate that there isn't a port here anymore. | |
2525 | */ | |
a2bceae0 | 2526 | uport->type = PORT_UNKNOWN; |
68ac64cd RK |
2527 | |
2528 | /* | |
2529 | * Kill the tasklet, and free resources. | |
2530 | */ | |
ebd2c8f6 | 2531 | tasklet_kill(&state->tlet); |
68ac64cd | 2532 | |
ebd2c8f6 | 2533 | state->uart_port = NULL; |
f392ecfa | 2534 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2535 | |
2536 | return 0; | |
2537 | } | |
2538 | ||
2539 | /* | |
2540 | * Are the two ports equivalent? | |
2541 | */ | |
2542 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2543 | { | |
2544 | if (port1->iotype != port2->iotype) | |
2545 | return 0; | |
2546 | ||
2547 | switch (port1->iotype) { | |
2548 | case UPIO_PORT: | |
2549 | return (port1->iobase == port2->iobase); | |
2550 | case UPIO_HUB6: | |
2551 | return (port1->iobase == port2->iobase) && | |
2552 | (port1->hub6 == port2->hub6); | |
2553 | case UPIO_MEM: | |
d21b55d3 SS |
2554 | case UPIO_MEM32: |
2555 | case UPIO_AU: | |
2556 | case UPIO_TSI: | |
beab697a | 2557 | case UPIO_DWAPB: |
a3ae0fc3 | 2558 | case UPIO_DWAPB32: |
1624f003 | 2559 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2560 | } |
2561 | return 0; | |
2562 | } | |
2563 | EXPORT_SYMBOL(uart_match_port); | |
2564 | ||
1da177e4 LT |
2565 | EXPORT_SYMBOL(uart_write_wakeup); |
2566 | EXPORT_SYMBOL(uart_register_driver); | |
2567 | EXPORT_SYMBOL(uart_unregister_driver); | |
2568 | EXPORT_SYMBOL(uart_suspend_port); | |
2569 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2570 | EXPORT_SYMBOL(uart_add_one_port); |
2571 | EXPORT_SYMBOL(uart_remove_one_port); | |
2572 | ||
2573 | MODULE_DESCRIPTION("Serial driver core"); | |
2574 | MODULE_LICENSE("GPL"); |