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/serial_core.h> |
33 | #include <linux/smp_lock.h> | |
34 | #include <linux/device.h> | |
35 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ | |
36 | #include <linux/delay.h> | |
f392ecfa | 37 | #include <linux/mutex.h> |
1da177e4 LT |
38 | |
39 | #include <asm/irq.h> | |
40 | #include <asm/uaccess.h> | |
41 | ||
1da177e4 LT |
42 | /* |
43 | * This is used to lock changes in serial line configuration. | |
44 | */ | |
f392ecfa | 45 | static DEFINE_MUTEX(port_mutex); |
1da177e4 | 46 | |
13e83599 IM |
47 | /* |
48 | * lockdep: port->lock is initialized in two places, but we | |
49 | * want only one lock-class: | |
50 | */ | |
51 | static struct lock_class_key port_lock_key; | |
52 | ||
1da177e4 LT |
53 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
54 | ||
91312cdb | 55 | #define uart_users(state) ((state)->port.count + (state)->port.blocked_open) |
1da177e4 LT |
56 | |
57 | #ifdef CONFIG_SERIAL_CORE_CONSOLE | |
58 | #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) | |
59 | #else | |
60 | #define uart_console(port) (0) | |
61 | #endif | |
62 | ||
a46c9994 AC |
63 | static void uart_change_speed(struct uart_state *state, |
64 | struct ktermios *old_termios); | |
1da177e4 LT |
65 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
66 | static void uart_change_pm(struct uart_state *state, int pm_state); | |
67 | ||
68 | /* | |
69 | * This routine is used by the interrupt handler to schedule processing in | |
70 | * the software interrupt portion of the driver. | |
71 | */ | |
72 | void uart_write_wakeup(struct uart_port *port) | |
73 | { | |
ebd2c8f6 | 74 | struct uart_state *state = port->state; |
d5f735e5 PM |
75 | /* |
76 | * This means you called this function _after_ the port was | |
77 | * closed. No cookie for you. | |
78 | */ | |
ebd2c8f6 AC |
79 | BUG_ON(!state); |
80 | tasklet_schedule(&state->tlet); | |
1da177e4 LT |
81 | } |
82 | ||
83 | static void uart_stop(struct tty_struct *tty) | |
84 | { | |
85 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 86 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
87 | unsigned long flags; |
88 | ||
89 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 90 | port->ops->stop_tx(port); |
1da177e4 LT |
91 | spin_unlock_irqrestore(&port->lock, flags); |
92 | } | |
93 | ||
94 | static void __uart_start(struct tty_struct *tty) | |
95 | { | |
96 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 97 | struct uart_port *port = state->uart_port; |
1da177e4 | 98 | |
ebd2c8f6 | 99 | if (!uart_circ_empty(&state->xmit) && state->xmit.buf && |
1da177e4 | 100 | !tty->stopped && !tty->hw_stopped) |
b129a8cc | 101 | port->ops->start_tx(port); |
1da177e4 LT |
102 | } |
103 | ||
104 | static void uart_start(struct tty_struct *tty) | |
105 | { | |
106 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 107 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
108 | unsigned long flags; |
109 | ||
110 | spin_lock_irqsave(&port->lock, flags); | |
111 | __uart_start(tty); | |
112 | spin_unlock_irqrestore(&port->lock, flags); | |
113 | } | |
114 | ||
115 | static void uart_tasklet_action(unsigned long data) | |
116 | { | |
117 | struct uart_state *state = (struct uart_state *)data; | |
ebd2c8f6 | 118 | tty_wakeup(state->port.tty); |
1da177e4 LT |
119 | } |
120 | ||
121 | static inline void | |
122 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) | |
123 | { | |
124 | unsigned long flags; | |
125 | unsigned int old; | |
126 | ||
127 | spin_lock_irqsave(&port->lock, flags); | |
128 | old = port->mctrl; | |
129 | port->mctrl = (old & ~clear) | set; | |
130 | if (old != port->mctrl) | |
131 | port->ops->set_mctrl(port, port->mctrl); | |
132 | spin_unlock_irqrestore(&port->lock, flags); | |
133 | } | |
134 | ||
a46c9994 AC |
135 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
136 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) | |
1da177e4 LT |
137 | |
138 | /* | |
139 | * Startup the port. This will be called once per open. All calls | |
df4f4dd4 | 140 | * will be serialised by the per-port mutex. |
1da177e4 LT |
141 | */ |
142 | static int uart_startup(struct uart_state *state, int init_hw) | |
143 | { | |
46d57a44 AC |
144 | struct uart_port *uport = state->uart_port; |
145 | struct tty_port *port = &state->port; | |
1da177e4 LT |
146 | unsigned long page; |
147 | int retval = 0; | |
148 | ||
ebd2c8f6 | 149 | if (state->flags & UIF_INITIALIZED) |
1da177e4 LT |
150 | return 0; |
151 | ||
152 | /* | |
153 | * Set the TTY IO error marker - we will only clear this | |
154 | * once we have successfully opened the port. Also set | |
155 | * up the tty->alt_speed kludge | |
156 | */ | |
46d57a44 | 157 | set_bit(TTY_IO_ERROR, &port->tty->flags); |
1da177e4 | 158 | |
46d57a44 | 159 | if (uport->type == PORT_UNKNOWN) |
1da177e4 LT |
160 | return 0; |
161 | ||
162 | /* | |
163 | * Initialise and allocate the transmit and temporary | |
164 | * buffer. | |
165 | */ | |
ebd2c8f6 | 166 | if (!state->xmit.buf) { |
df4f4dd4 | 167 | /* This is protected by the per port mutex */ |
1da177e4 LT |
168 | page = get_zeroed_page(GFP_KERNEL); |
169 | if (!page) | |
170 | return -ENOMEM; | |
171 | ||
ebd2c8f6 AC |
172 | state->xmit.buf = (unsigned char *) page; |
173 | uart_circ_clear(&state->xmit); | |
1da177e4 LT |
174 | } |
175 | ||
46d57a44 | 176 | retval = uport->ops->startup(uport); |
1da177e4 LT |
177 | if (retval == 0) { |
178 | if (init_hw) { | |
179 | /* | |
180 | * Initialise the hardware port settings. | |
181 | */ | |
182 | uart_change_speed(state, NULL); | |
183 | ||
184 | /* | |
185 | * Setup the RTS and DTR signals once the | |
186 | * port is open and ready to respond. | |
187 | */ | |
46d57a44 AC |
188 | if (port->tty->termios->c_cflag & CBAUD) |
189 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); | |
1da177e4 LT |
190 | } |
191 | ||
ebd2c8f6 | 192 | if (state->flags & UIF_CTS_FLOW) { |
46d57a44 AC |
193 | spin_lock_irq(&uport->lock); |
194 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) | |
195 | port->tty->hw_stopped = 1; | |
196 | spin_unlock_irq(&uport->lock); | |
0dd7a1ae RK |
197 | } |
198 | ||
ebd2c8f6 | 199 | state->flags |= UIF_INITIALIZED; |
1da177e4 | 200 | |
46d57a44 | 201 | clear_bit(TTY_IO_ERROR, &port->tty->flags); |
1da177e4 LT |
202 | } |
203 | ||
204 | if (retval && capable(CAP_SYS_ADMIN)) | |
205 | retval = 0; | |
206 | ||
207 | return retval; | |
208 | } | |
209 | ||
210 | /* | |
211 | * This routine will shutdown a serial port; interrupts are disabled, and | |
212 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
213 | * uart_shutdown are serialised by the per-port semaphore. | |
214 | */ | |
215 | static void uart_shutdown(struct uart_state *state) | |
216 | { | |
ebd2c8f6 AC |
217 | struct uart_port *port = state->uart_port; |
218 | struct tty_struct *tty = state->port.tty; | |
1da177e4 | 219 | |
1da177e4 | 220 | /* |
ee31b337 | 221 | * Set the TTY IO error marker |
1da177e4 | 222 | */ |
f751928e AC |
223 | if (tty) |
224 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 225 | |
ebd2c8f6 AC |
226 | if (state->flags & UIF_INITIALIZED) { |
227 | state->flags &= ~UIF_INITIALIZED; | |
1da177e4 | 228 | |
ee31b337 RK |
229 | /* |
230 | * Turn off DTR and RTS early. | |
231 | */ | |
f751928e | 232 | if (!tty || (tty->termios->c_cflag & HUPCL)) |
ee31b337 RK |
233 | uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); |
234 | ||
235 | /* | |
236 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
237 | * the irq here so the queue might never be woken up. Note | |
238 | * that we won't end up waiting on delta_msr_wait again since | |
239 | * any outstanding file descriptors should be pointing at | |
240 | * hung_up_tty_fops now. | |
241 | */ | |
ebd2c8f6 | 242 | wake_up_interruptible(&state->delta_msr_wait); |
ee31b337 RK |
243 | |
244 | /* | |
245 | * Free the IRQ and disable the port. | |
246 | */ | |
247 | port->ops->shutdown(port); | |
248 | ||
249 | /* | |
250 | * Ensure that the IRQ handler isn't running on another CPU. | |
251 | */ | |
252 | synchronize_irq(port->irq); | |
253 | } | |
1da177e4 LT |
254 | |
255 | /* | |
ee31b337 | 256 | * kill off our tasklet |
1da177e4 | 257 | */ |
ebd2c8f6 | 258 | tasklet_kill(&state->tlet); |
1da177e4 LT |
259 | |
260 | /* | |
261 | * Free the transmit buffer page. | |
262 | */ | |
ebd2c8f6 AC |
263 | if (state->xmit.buf) { |
264 | free_page((unsigned long)state->xmit.buf); | |
265 | state->xmit.buf = NULL; | |
1da177e4 | 266 | } |
1da177e4 LT |
267 | } |
268 | ||
269 | /** | |
270 | * uart_update_timeout - update per-port FIFO timeout. | |
271 | * @port: uart_port structure describing the port | |
272 | * @cflag: termios cflag value | |
273 | * @baud: speed of the port | |
274 | * | |
275 | * Set the port FIFO timeout value. The @cflag value should | |
276 | * reflect the actual hardware settings. | |
277 | */ | |
278 | void | |
279 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
280 | unsigned int baud) | |
281 | { | |
282 | unsigned int bits; | |
283 | ||
284 | /* byte size and parity */ | |
285 | switch (cflag & CSIZE) { | |
286 | case CS5: | |
287 | bits = 7; | |
288 | break; | |
289 | case CS6: | |
290 | bits = 8; | |
291 | break; | |
292 | case CS7: | |
293 | bits = 9; | |
294 | break; | |
295 | default: | |
296 | bits = 10; | |
a46c9994 | 297 | break; /* CS8 */ |
1da177e4 LT |
298 | } |
299 | ||
300 | if (cflag & CSTOPB) | |
301 | bits++; | |
302 | if (cflag & PARENB) | |
303 | bits++; | |
304 | ||
305 | /* | |
306 | * The total number of bits to be transmitted in the fifo. | |
307 | */ | |
308 | bits = bits * port->fifosize; | |
309 | ||
310 | /* | |
311 | * Figure the timeout to send the above number of bits. | |
312 | * Add .02 seconds of slop | |
313 | */ | |
314 | port->timeout = (HZ * bits) / baud + HZ/50; | |
315 | } | |
316 | ||
317 | EXPORT_SYMBOL(uart_update_timeout); | |
318 | ||
319 | /** | |
320 | * uart_get_baud_rate - return baud rate for a particular port | |
321 | * @port: uart_port structure describing the port in question. | |
322 | * @termios: desired termios settings. | |
323 | * @old: old termios (or NULL) | |
324 | * @min: minimum acceptable baud rate | |
325 | * @max: maximum acceptable baud rate | |
326 | * | |
327 | * Decode the termios structure into a numeric baud rate, | |
328 | * taking account of the magic 38400 baud rate (with spd_* | |
329 | * flags), and mapping the %B0 rate to 9600 baud. | |
330 | * | |
331 | * If the new baud rate is invalid, try the old termios setting. | |
332 | * If it's still invalid, we try 9600 baud. | |
333 | * | |
334 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
335 | * we're actually going to be using. Don't do this for the case |
336 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
337 | */ |
338 | unsigned int | |
606d099c AC |
339 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
340 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
341 | { |
342 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 343 | int hung_up = 0; |
0077d45e | 344 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
345 | |
346 | if (flags == UPF_SPD_HI) | |
347 | altbaud = 57600; | |
348 | if (flags == UPF_SPD_VHI) | |
349 | altbaud = 115200; | |
350 | if (flags == UPF_SPD_SHI) | |
351 | altbaud = 230400; | |
352 | if (flags == UPF_SPD_WARP) | |
353 | altbaud = 460800; | |
354 | ||
355 | for (try = 0; try < 2; try++) { | |
356 | baud = tty_termios_baud_rate(termios); | |
357 | ||
358 | /* | |
359 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
360 | * Die! Die! Die! | |
361 | */ | |
362 | if (baud == 38400) | |
363 | baud = altbaud; | |
364 | ||
365 | /* | |
366 | * Special case: B0 rate. | |
367 | */ | |
eb424fd2 AC |
368 | if (baud == 0) { |
369 | hung_up = 1; | |
1da177e4 | 370 | baud = 9600; |
eb424fd2 | 371 | } |
1da177e4 LT |
372 | |
373 | if (baud >= min && baud <= max) | |
374 | return baud; | |
375 | ||
376 | /* | |
377 | * Oops, the quotient was zero. Try again with | |
378 | * the old baud rate if possible. | |
379 | */ | |
380 | termios->c_cflag &= ~CBAUD; | |
381 | if (old) { | |
6d4d67be | 382 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
383 | if (!hung_up) |
384 | tty_termios_encode_baud_rate(termios, | |
385 | baud, baud); | |
1da177e4 LT |
386 | old = NULL; |
387 | continue; | |
388 | } | |
389 | ||
390 | /* | |
391 | * As a last resort, if the quotient is zero, | |
392 | * default to 9600 bps | |
393 | */ | |
eb424fd2 AC |
394 | if (!hung_up) |
395 | tty_termios_encode_baud_rate(termios, 9600, 9600); | |
1da177e4 LT |
396 | } |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | EXPORT_SYMBOL(uart_get_baud_rate); | |
402 | ||
403 | /** | |
404 | * uart_get_divisor - return uart clock divisor | |
405 | * @port: uart_port structure describing the port. | |
406 | * @baud: desired baud rate | |
407 | * | |
408 | * Calculate the uart clock divisor for the port. | |
409 | */ | |
410 | unsigned int | |
411 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
412 | { | |
413 | unsigned int quot; | |
414 | ||
415 | /* | |
416 | * Old custom speed handling. | |
417 | */ | |
418 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
419 | quot = port->custom_divisor; | |
420 | else | |
421 | quot = (port->uartclk + (8 * baud)) / (16 * baud); | |
422 | ||
423 | return quot; | |
424 | } | |
425 | ||
426 | EXPORT_SYMBOL(uart_get_divisor); | |
427 | ||
23d22cea | 428 | /* FIXME: Consistent locking policy */ |
1da177e4 | 429 | static void |
606d099c | 430 | uart_change_speed(struct uart_state *state, struct ktermios *old_termios) |
1da177e4 | 431 | { |
ebd2c8f6 AC |
432 | struct tty_struct *tty = state->port.tty; |
433 | struct uart_port *port = state->uart_port; | |
606d099c | 434 | struct ktermios *termios; |
1da177e4 LT |
435 | |
436 | /* | |
437 | * If we have no tty, termios, or the port does not exist, | |
438 | * then we can't set the parameters for this port. | |
439 | */ | |
440 | if (!tty || !tty->termios || port->type == PORT_UNKNOWN) | |
441 | return; | |
442 | ||
443 | termios = tty->termios; | |
444 | ||
445 | /* | |
446 | * Set flags based on termios cflag | |
447 | */ | |
448 | if (termios->c_cflag & CRTSCTS) | |
ebd2c8f6 | 449 | state->flags |= UIF_CTS_FLOW; |
1da177e4 | 450 | else |
ebd2c8f6 | 451 | state->flags &= ~UIF_CTS_FLOW; |
1da177e4 LT |
452 | |
453 | if (termios->c_cflag & CLOCAL) | |
ebd2c8f6 | 454 | state->flags &= ~UIF_CHECK_CD; |
1da177e4 | 455 | else |
ebd2c8f6 | 456 | state->flags |= UIF_CHECK_CD; |
1da177e4 LT |
457 | |
458 | port->ops->set_termios(port, termios, old_termios); | |
459 | } | |
460 | ||
23d22cea | 461 | static inline int |
1da177e4 LT |
462 | __uart_put_char(struct uart_port *port, struct circ_buf *circ, unsigned char c) |
463 | { | |
464 | unsigned long flags; | |
23d22cea | 465 | int ret = 0; |
1da177e4 LT |
466 | |
467 | if (!circ->buf) | |
23d22cea | 468 | return 0; |
1da177e4 LT |
469 | |
470 | spin_lock_irqsave(&port->lock, flags); | |
471 | if (uart_circ_chars_free(circ) != 0) { | |
472 | circ->buf[circ->head] = c; | |
473 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 474 | ret = 1; |
1da177e4 LT |
475 | } |
476 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 477 | return ret; |
1da177e4 LT |
478 | } |
479 | ||
23d22cea | 480 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
481 | { |
482 | struct uart_state *state = tty->driver_data; | |
483 | ||
ebd2c8f6 | 484 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
1da177e4 LT |
485 | } |
486 | ||
487 | static void uart_flush_chars(struct tty_struct *tty) | |
488 | { | |
489 | uart_start(tty); | |
490 | } | |
491 | ||
492 | static int | |
d5f735e5 | 493 | uart_write(struct tty_struct *tty, const unsigned char *buf, int count) |
1da177e4 LT |
494 | { |
495 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
496 | struct uart_port *port; |
497 | struct circ_buf *circ; | |
1da177e4 LT |
498 | unsigned long flags; |
499 | int c, ret = 0; | |
500 | ||
d5f735e5 PM |
501 | /* |
502 | * This means you called this function _after_ the port was | |
503 | * closed. No cookie for you. | |
504 | */ | |
f751928e | 505 | if (!state) { |
d5f735e5 PM |
506 | WARN_ON(1); |
507 | return -EL3HLT; | |
508 | } | |
509 | ||
ebd2c8f6 AC |
510 | port = state->uart_port; |
511 | circ = &state->xmit; | |
d5f735e5 | 512 | |
1da177e4 LT |
513 | if (!circ->buf) |
514 | return 0; | |
515 | ||
516 | spin_lock_irqsave(&port->lock, flags); | |
517 | while (1) { | |
518 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
519 | if (count < c) | |
520 | c = count; | |
521 | if (c <= 0) | |
522 | break; | |
523 | memcpy(circ->buf + circ->head, buf, c); | |
524 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
525 | buf += c; | |
526 | count -= c; | |
527 | ret += c; | |
528 | } | |
529 | spin_unlock_irqrestore(&port->lock, flags); | |
530 | ||
531 | uart_start(tty); | |
532 | return ret; | |
533 | } | |
534 | ||
535 | static int uart_write_room(struct tty_struct *tty) | |
536 | { | |
537 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
538 | unsigned long flags; |
539 | int ret; | |
1da177e4 | 540 | |
ebd2c8f6 AC |
541 | spin_lock_irqsave(&state->uart_port->lock, flags); |
542 | ret = uart_circ_chars_free(&state->xmit); | |
543 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 544 | return ret; |
1da177e4 LT |
545 | } |
546 | ||
547 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
548 | { | |
549 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
550 | unsigned long flags; |
551 | int ret; | |
1da177e4 | 552 | |
ebd2c8f6 AC |
553 | spin_lock_irqsave(&state->uart_port->lock, flags); |
554 | ret = uart_circ_chars_pending(&state->xmit); | |
555 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 556 | return ret; |
1da177e4 LT |
557 | } |
558 | ||
559 | static void uart_flush_buffer(struct tty_struct *tty) | |
560 | { | |
561 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 562 | struct uart_port *port; |
1da177e4 LT |
563 | unsigned long flags; |
564 | ||
d5f735e5 PM |
565 | /* |
566 | * This means you called this function _after_ the port was | |
567 | * closed. No cookie for you. | |
568 | */ | |
f751928e | 569 | if (!state) { |
d5f735e5 PM |
570 | WARN_ON(1); |
571 | return; | |
572 | } | |
573 | ||
ebd2c8f6 | 574 | port = state->uart_port; |
eb3a1e11 | 575 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
576 | |
577 | spin_lock_irqsave(&port->lock, flags); | |
ebd2c8f6 | 578 | uart_circ_clear(&state->xmit); |
6bb0e3a5 HS |
579 | if (port->ops->flush_buffer) |
580 | port->ops->flush_buffer(port); | |
1da177e4 LT |
581 | spin_unlock_irqrestore(&port->lock, flags); |
582 | tty_wakeup(tty); | |
583 | } | |
584 | ||
585 | /* | |
586 | * This function is used to send a high-priority XON/XOFF character to | |
587 | * the device | |
588 | */ | |
589 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
590 | { | |
591 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 592 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
593 | unsigned long flags; |
594 | ||
595 | if (port->ops->send_xchar) | |
596 | port->ops->send_xchar(port, ch); | |
597 | else { | |
598 | port->x_char = ch; | |
599 | if (ch) { | |
600 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 601 | port->ops->start_tx(port); |
1da177e4 LT |
602 | spin_unlock_irqrestore(&port->lock, flags); |
603 | } | |
604 | } | |
605 | } | |
606 | ||
607 | static void uart_throttle(struct tty_struct *tty) | |
608 | { | |
609 | struct uart_state *state = tty->driver_data; | |
610 | ||
611 | if (I_IXOFF(tty)) | |
612 | uart_send_xchar(tty, STOP_CHAR(tty)); | |
613 | ||
614 | if (tty->termios->c_cflag & CRTSCTS) | |
ebd2c8f6 | 615 | uart_clear_mctrl(state->uart_port, TIOCM_RTS); |
1da177e4 LT |
616 | } |
617 | ||
618 | static void uart_unthrottle(struct tty_struct *tty) | |
619 | { | |
620 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 621 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
622 | |
623 | if (I_IXOFF(tty)) { | |
624 | if (port->x_char) | |
625 | port->x_char = 0; | |
626 | else | |
627 | uart_send_xchar(tty, START_CHAR(tty)); | |
628 | } | |
629 | ||
630 | if (tty->termios->c_cflag & CRTSCTS) | |
631 | uart_set_mctrl(port, TIOCM_RTS); | |
632 | } | |
633 | ||
634 | static int uart_get_info(struct uart_state *state, | |
635 | struct serial_struct __user *retinfo) | |
636 | { | |
ebd2c8f6 | 637 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
638 | struct serial_struct tmp; |
639 | ||
640 | memset(&tmp, 0, sizeof(tmp)); | |
f34d7a5b AC |
641 | |
642 | /* Ensure the state we copy is consistent and no hardware changes | |
643 | occur as we go */ | |
644 | mutex_lock(&state->mutex); | |
645 | ||
1da177e4 LT |
646 | tmp.type = port->type; |
647 | tmp.line = port->line; | |
648 | tmp.port = port->iobase; | |
649 | if (HIGH_BITS_OFFSET) | |
650 | tmp.port_high = (long) port->iobase >> HIGH_BITS_OFFSET; | |
651 | tmp.irq = port->irq; | |
652 | tmp.flags = port->flags; | |
653 | tmp.xmit_fifo_size = port->fifosize; | |
654 | tmp.baud_base = port->uartclk / 16; | |
5e99df56 AC |
655 | tmp.close_delay = state->port.close_delay / 10; |
656 | tmp.closing_wait = state->port.closing_wait == USF_CLOSING_WAIT_NONE ? | |
1da177e4 | 657 | ASYNC_CLOSING_WAIT_NONE : |
5e99df56 | 658 | state->port.closing_wait / 10; |
1da177e4 LT |
659 | tmp.custom_divisor = port->custom_divisor; |
660 | tmp.hub6 = port->hub6; | |
661 | tmp.io_type = port->iotype; | |
662 | tmp.iomem_reg_shift = port->regshift; | |
4f640efb | 663 | tmp.iomem_base = (void *)(unsigned long)port->mapbase; |
1da177e4 | 664 | |
f34d7a5b AC |
665 | mutex_unlock(&state->mutex); |
666 | ||
1da177e4 LT |
667 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
668 | return -EFAULT; | |
669 | return 0; | |
670 | } | |
671 | ||
672 | static int uart_set_info(struct uart_state *state, | |
673 | struct serial_struct __user *newinfo) | |
674 | { | |
675 | struct serial_struct new_serial; | |
46d57a44 AC |
676 | struct uart_port *uport = state->uart_port; |
677 | struct tty_port *port = &state->port; | |
1da177e4 | 678 | unsigned long new_port; |
0077d45e | 679 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 680 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 681 | upf_t old_flags, new_flags; |
1da177e4 LT |
682 | int retval = 0; |
683 | ||
684 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
685 | return -EFAULT; | |
686 | ||
687 | new_port = new_serial.port; | |
688 | if (HIGH_BITS_OFFSET) | |
689 | new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; | |
690 | ||
691 | new_serial.irq = irq_canonicalize(new_serial.irq); | |
692 | close_delay = new_serial.close_delay * 10; | |
693 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
694 | USF_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; | |
695 | ||
696 | /* | |
91312cdb | 697 | * This semaphore protects port->count. It is also |
1da177e4 LT |
698 | * very useful to prevent opens. Also, take the |
699 | * port configuration semaphore to make sure that a | |
700 | * module insertion/removal doesn't change anything | |
701 | * under us. | |
702 | */ | |
e2862f6a | 703 | mutex_lock(&state->mutex); |
1da177e4 | 704 | |
46d57a44 AC |
705 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
706 | && new_serial.irq != uport->irq; | |
1da177e4 LT |
707 | |
708 | /* | |
709 | * Since changing the 'type' of the port changes its resource | |
710 | * allocations, we should treat type changes the same as | |
711 | * IO port changes. | |
712 | */ | |
46d57a44 AC |
713 | change_port = !(uport->flags & UPF_FIXED_PORT) |
714 | && (new_port != uport->iobase || | |
715 | (unsigned long)new_serial.iomem_base != uport->mapbase || | |
716 | new_serial.hub6 != uport->hub6 || | |
717 | new_serial.io_type != uport->iotype || | |
718 | new_serial.iomem_reg_shift != uport->regshift || | |
719 | new_serial.type != uport->type); | |
720 | ||
721 | old_flags = uport->flags; | |
0077d45e | 722 | new_flags = new_serial.flags; |
46d57a44 | 723 | old_custom_divisor = uport->custom_divisor; |
1da177e4 LT |
724 | |
725 | if (!capable(CAP_SYS_ADMIN)) { | |
726 | retval = -EPERM; | |
727 | if (change_irq || change_port || | |
46d57a44 AC |
728 | (new_serial.baud_base != uport->uartclk / 16) || |
729 | (close_delay != port->close_delay) || | |
730 | (closing_wait != port->closing_wait) || | |
947deee8 | 731 | (new_serial.xmit_fifo_size && |
46d57a44 | 732 | new_serial.xmit_fifo_size != uport->fifosize) || |
0077d45e | 733 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 | 734 | goto exit; |
46d57a44 | 735 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
0077d45e | 736 | (new_flags & UPF_USR_MASK)); |
46d57a44 | 737 | uport->custom_divisor = new_serial.custom_divisor; |
1da177e4 LT |
738 | goto check_and_exit; |
739 | } | |
740 | ||
741 | /* | |
742 | * Ask the low level driver to verify the settings. | |
743 | */ | |
46d57a44 AC |
744 | if (uport->ops->verify_port) |
745 | retval = uport->ops->verify_port(uport, &new_serial); | |
1da177e4 | 746 | |
a62c4133 | 747 | if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || |
1da177e4 LT |
748 | (new_serial.baud_base < 9600)) |
749 | retval = -EINVAL; | |
750 | ||
751 | if (retval) | |
752 | goto exit; | |
753 | ||
754 | if (change_port || change_irq) { | |
755 | retval = -EBUSY; | |
756 | ||
757 | /* | |
758 | * Make sure that we are the sole user of this port. | |
759 | */ | |
760 | if (uart_users(state) > 1) | |
761 | goto exit; | |
762 | ||
763 | /* | |
764 | * We need to shutdown the serial port at the old | |
765 | * port/type/irq combination. | |
766 | */ | |
767 | uart_shutdown(state); | |
768 | } | |
769 | ||
770 | if (change_port) { | |
771 | unsigned long old_iobase, old_mapbase; | |
772 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
773 | ||
46d57a44 AC |
774 | old_iobase = uport->iobase; |
775 | old_mapbase = uport->mapbase; | |
776 | old_type = uport->type; | |
777 | old_hub6 = uport->hub6; | |
778 | old_iotype = uport->iotype; | |
779 | old_shift = uport->regshift; | |
1da177e4 LT |
780 | |
781 | /* | |
782 | * Free and release old regions | |
783 | */ | |
784 | if (old_type != PORT_UNKNOWN) | |
46d57a44 | 785 | uport->ops->release_port(uport); |
1da177e4 | 786 | |
46d57a44 AC |
787 | uport->iobase = new_port; |
788 | uport->type = new_serial.type; | |
789 | uport->hub6 = new_serial.hub6; | |
790 | uport->iotype = new_serial.io_type; | |
791 | uport->regshift = new_serial.iomem_reg_shift; | |
792 | uport->mapbase = (unsigned long)new_serial.iomem_base; | |
1da177e4 LT |
793 | |
794 | /* | |
795 | * Claim and map the new regions | |
796 | */ | |
46d57a44 AC |
797 | if (uport->type != PORT_UNKNOWN) { |
798 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
799 | } else { |
800 | /* Always success - Jean II */ | |
801 | retval = 0; | |
802 | } | |
803 | ||
804 | /* | |
805 | * If we fail to request resources for the | |
806 | * new port, try to restore the old settings. | |
807 | */ | |
808 | if (retval && old_type != PORT_UNKNOWN) { | |
46d57a44 AC |
809 | uport->iobase = old_iobase; |
810 | uport->type = old_type; | |
811 | uport->hub6 = old_hub6; | |
812 | uport->iotype = old_iotype; | |
813 | uport->regshift = old_shift; | |
814 | uport->mapbase = old_mapbase; | |
815 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
816 | /* |
817 | * If we failed to restore the old settings, | |
818 | * we fail like this. | |
819 | */ | |
820 | if (retval) | |
46d57a44 | 821 | uport->type = PORT_UNKNOWN; |
1da177e4 LT |
822 | |
823 | /* | |
824 | * We failed anyway. | |
825 | */ | |
826 | retval = -EBUSY; | |
a46c9994 AC |
827 | /* Added to return the correct error -Ram Gupta */ |
828 | goto exit; | |
1da177e4 LT |
829 | } |
830 | } | |
831 | ||
abb4a239 | 832 | if (change_irq) |
46d57a44 AC |
833 | uport->irq = new_serial.irq; |
834 | if (!(uport->flags & UPF_FIXED_PORT)) | |
835 | uport->uartclk = new_serial.baud_base * 16; | |
836 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | | |
0077d45e | 837 | (new_flags & UPF_CHANGE_MASK); |
46d57a44 AC |
838 | uport->custom_divisor = new_serial.custom_divisor; |
839 | port->close_delay = close_delay; | |
840 | port->closing_wait = closing_wait; | |
947deee8 | 841 | if (new_serial.xmit_fifo_size) |
46d57a44 AC |
842 | uport->fifosize = new_serial.xmit_fifo_size; |
843 | if (port->tty) | |
844 | port->tty->low_latency = | |
845 | (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
1da177e4 LT |
846 | |
847 | check_and_exit: | |
848 | retval = 0; | |
46d57a44 | 849 | if (uport->type == PORT_UNKNOWN) |
1da177e4 | 850 | goto exit; |
ebd2c8f6 | 851 | if (state->flags & UIF_INITIALIZED) { |
46d57a44 AC |
852 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
853 | old_custom_divisor != uport->custom_divisor) { | |
1da177e4 LT |
854 | /* |
855 | * If they're setting up a custom divisor or speed, | |
856 | * instead of clearing it, then bitch about it. No | |
857 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
858 | */ | |
46d57a44 | 859 | if (uport->flags & UPF_SPD_MASK) { |
1da177e4 LT |
860 | char buf[64]; |
861 | printk(KERN_NOTICE | |
862 | "%s sets custom speed on %s. This " | |
863 | "is deprecated.\n", current->comm, | |
46d57a44 | 864 | tty_name(port->tty, buf)); |
1da177e4 LT |
865 | } |
866 | uart_change_speed(state, NULL); | |
867 | } | |
868 | } else | |
869 | retval = uart_startup(state, 1); | |
870 | exit: | |
e2862f6a | 871 | mutex_unlock(&state->mutex); |
1da177e4 LT |
872 | return retval; |
873 | } | |
874 | ||
875 | ||
876 | /* | |
877 | * uart_get_lsr_info - get line status register info. | |
878 | * Note: uart_ioctl protects us against hangups. | |
879 | */ | |
880 | static int uart_get_lsr_info(struct uart_state *state, | |
881 | unsigned int __user *value) | |
882 | { | |
46d57a44 AC |
883 | struct uart_port *uport = state->uart_port; |
884 | struct tty_port *port = &state->port; | |
1da177e4 LT |
885 | unsigned int result; |
886 | ||
46d57a44 | 887 | result = uport->ops->tx_empty(uport); |
1da177e4 LT |
888 | |
889 | /* | |
890 | * If we're about to load something into the transmit | |
891 | * register, we'll pretend the transmitter isn't empty to | |
892 | * avoid a race condition (depending on when the transmit | |
893 | * interrupt happens). | |
894 | */ | |
46d57a44 | 895 | if (uport->x_char || |
ebd2c8f6 | 896 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
46d57a44 | 897 | !port->tty->stopped && !port->tty->hw_stopped)) |
1da177e4 | 898 | result &= ~TIOCSER_TEMT; |
a46c9994 | 899 | |
1da177e4 LT |
900 | return put_user(result, value); |
901 | } | |
902 | ||
903 | static int uart_tiocmget(struct tty_struct *tty, struct file *file) | |
904 | { | |
905 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 906 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
907 | int result = -EIO; |
908 | ||
e2862f6a | 909 | mutex_lock(&state->mutex); |
1da177e4 LT |
910 | if ((!file || !tty_hung_up_p(file)) && |
911 | !(tty->flags & (1 << TTY_IO_ERROR))) { | |
46d57a44 | 912 | result = uport->mctrl; |
c5f4644e | 913 | |
46d57a44 AC |
914 | spin_lock_irq(&uport->lock); |
915 | result |= uport->ops->get_mctrl(uport); | |
916 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 917 | } |
e2862f6a | 918 | mutex_unlock(&state->mutex); |
1da177e4 LT |
919 | |
920 | return result; | |
921 | } | |
922 | ||
923 | static int | |
924 | uart_tiocmset(struct tty_struct *tty, struct file *file, | |
925 | unsigned int set, unsigned int clear) | |
926 | { | |
927 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 928 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
929 | int ret = -EIO; |
930 | ||
e2862f6a | 931 | mutex_lock(&state->mutex); |
1da177e4 LT |
932 | if ((!file || !tty_hung_up_p(file)) && |
933 | !(tty->flags & (1 << TTY_IO_ERROR))) { | |
46d57a44 | 934 | uart_update_mctrl(uport, set, clear); |
1da177e4 LT |
935 | ret = 0; |
936 | } | |
e2862f6a | 937 | mutex_unlock(&state->mutex); |
1da177e4 LT |
938 | return ret; |
939 | } | |
940 | ||
9e98966c | 941 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
942 | { |
943 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 944 | struct uart_port *uport = state->uart_port; |
1da177e4 | 945 | |
e2862f6a | 946 | mutex_lock(&state->mutex); |
1da177e4 | 947 | |
46d57a44 AC |
948 | if (uport->type != PORT_UNKNOWN) |
949 | uport->ops->break_ctl(uport, break_state); | |
1da177e4 | 950 | |
e2862f6a | 951 | mutex_unlock(&state->mutex); |
9e98966c | 952 | return 0; |
1da177e4 LT |
953 | } |
954 | ||
955 | static int uart_do_autoconfig(struct uart_state *state) | |
956 | { | |
46d57a44 | 957 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
958 | int flags, ret; |
959 | ||
960 | if (!capable(CAP_SYS_ADMIN)) | |
961 | return -EPERM; | |
962 | ||
963 | /* | |
964 | * Take the per-port semaphore. This prevents count from | |
965 | * changing, and hence any extra opens of the port while | |
966 | * we're auto-configuring. | |
967 | */ | |
e2862f6a | 968 | if (mutex_lock_interruptible(&state->mutex)) |
1da177e4 LT |
969 | return -ERESTARTSYS; |
970 | ||
971 | ret = -EBUSY; | |
972 | if (uart_users(state) == 1) { | |
973 | uart_shutdown(state); | |
974 | ||
975 | /* | |
976 | * If we already have a port type configured, | |
977 | * we must release its resources. | |
978 | */ | |
46d57a44 AC |
979 | if (uport->type != PORT_UNKNOWN) |
980 | uport->ops->release_port(uport); | |
1da177e4 LT |
981 | |
982 | flags = UART_CONFIG_TYPE; | |
46d57a44 | 983 | if (uport->flags & UPF_AUTO_IRQ) |
1da177e4 LT |
984 | flags |= UART_CONFIG_IRQ; |
985 | ||
986 | /* | |
987 | * This will claim the ports resources if | |
988 | * a port is found. | |
989 | */ | |
46d57a44 | 990 | uport->ops->config_port(uport, flags); |
1da177e4 LT |
991 | |
992 | ret = uart_startup(state, 1); | |
993 | } | |
e2862f6a | 994 | mutex_unlock(&state->mutex); |
1da177e4 LT |
995 | return ret; |
996 | } | |
997 | ||
998 | /* | |
999 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1000 | * - mask passed in arg for lines of interest | |
1001 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1002 | * Caller should use TIOCGICOUNT to see which one it was | |
1003 | */ | |
1004 | static int | |
1005 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
1006 | { | |
46d57a44 | 1007 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
1008 | DECLARE_WAITQUEUE(wait, current); |
1009 | struct uart_icount cprev, cnow; | |
1010 | int ret; | |
1011 | ||
1012 | /* | |
1013 | * note the counters on entry | |
1014 | */ | |
46d57a44 AC |
1015 | spin_lock_irq(&uport->lock); |
1016 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); | |
1da177e4 LT |
1017 | |
1018 | /* | |
1019 | * Force modem status interrupts on | |
1020 | */ | |
46d57a44 AC |
1021 | uport->ops->enable_ms(uport); |
1022 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1023 | |
ebd2c8f6 | 1024 | add_wait_queue(&state->delta_msr_wait, &wait); |
1da177e4 | 1025 | for (;;) { |
46d57a44 AC |
1026 | spin_lock_irq(&uport->lock); |
1027 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1028 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1029 | |
1030 | set_current_state(TASK_INTERRUPTIBLE); | |
1031 | ||
1032 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1033 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1034 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1035 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1036 | ret = 0; |
1037 | break; | |
1da177e4 LT |
1038 | } |
1039 | ||
1040 | schedule(); | |
1041 | ||
1042 | /* see if a signal did it */ | |
1043 | if (signal_pending(current)) { | |
1044 | ret = -ERESTARTSYS; | |
1045 | break; | |
1046 | } | |
1047 | ||
1048 | cprev = cnow; | |
1049 | } | |
1050 | ||
1051 | current->state = TASK_RUNNING; | |
ebd2c8f6 | 1052 | remove_wait_queue(&state->delta_msr_wait, &wait); |
1da177e4 LT |
1053 | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1059 | * Return: write counters to the user passed counter struct | |
1060 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1061 | * RI where only 0->1 is counted. | |
1062 | */ | |
1063 | static int uart_get_count(struct uart_state *state, | |
1064 | struct serial_icounter_struct __user *icnt) | |
1065 | { | |
1066 | struct serial_icounter_struct icount; | |
1067 | struct uart_icount cnow; | |
46d57a44 | 1068 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1069 | |
46d57a44 AC |
1070 | spin_lock_irq(&uport->lock); |
1071 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1072 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1073 | |
1074 | icount.cts = cnow.cts; | |
1075 | icount.dsr = cnow.dsr; | |
1076 | icount.rng = cnow.rng; | |
1077 | icount.dcd = cnow.dcd; | |
1078 | icount.rx = cnow.rx; | |
1079 | icount.tx = cnow.tx; | |
1080 | icount.frame = cnow.frame; | |
1081 | icount.overrun = cnow.overrun; | |
1082 | icount.parity = cnow.parity; | |
1083 | icount.brk = cnow.brk; | |
1084 | icount.buf_overrun = cnow.buf_overrun; | |
1085 | ||
1086 | return copy_to_user(icnt, &icount, sizeof(icount)) ? -EFAULT : 0; | |
1087 | } | |
1088 | ||
1089 | /* | |
e5238442 | 1090 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1091 | */ |
1092 | static int | |
1093 | uart_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, | |
1094 | unsigned long arg) | |
1095 | { | |
1096 | struct uart_state *state = tty->driver_data; | |
1097 | void __user *uarg = (void __user *)arg; | |
1098 | int ret = -ENOIOCTLCMD; | |
1099 | ||
1da177e4 LT |
1100 | |
1101 | /* | |
1102 | * These ioctls don't rely on the hardware to be present. | |
1103 | */ | |
1104 | switch (cmd) { | |
1105 | case TIOCGSERIAL: | |
1106 | ret = uart_get_info(state, uarg); | |
1107 | break; | |
1108 | ||
1109 | case TIOCSSERIAL: | |
1110 | ret = uart_set_info(state, uarg); | |
1111 | break; | |
1112 | ||
1113 | case TIOCSERCONFIG: | |
1114 | ret = uart_do_autoconfig(state); | |
1115 | break; | |
1116 | ||
1117 | case TIOCSERGWILD: /* obsolete */ | |
1118 | case TIOCSERSWILD: /* obsolete */ | |
1119 | ret = 0; | |
1120 | break; | |
1121 | } | |
1122 | ||
1123 | if (ret != -ENOIOCTLCMD) | |
1124 | goto out; | |
1125 | ||
1126 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1127 | ret = -EIO; | |
1128 | goto out; | |
1129 | } | |
1130 | ||
1131 | /* | |
1132 | * The following should only be used when hardware is present. | |
1133 | */ | |
1134 | switch (cmd) { | |
1135 | case TIOCMIWAIT: | |
1136 | ret = uart_wait_modem_status(state, arg); | |
1137 | break; | |
1138 | ||
1139 | case TIOCGICOUNT: | |
1140 | ret = uart_get_count(state, uarg); | |
1141 | break; | |
1142 | } | |
1143 | ||
1144 | if (ret != -ENOIOCTLCMD) | |
1145 | goto out; | |
1146 | ||
e2862f6a | 1147 | mutex_lock(&state->mutex); |
1da177e4 LT |
1148 | |
1149 | if (tty_hung_up_p(filp)) { | |
1150 | ret = -EIO; | |
1151 | goto out_up; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * All these rely on hardware being present and need to be | |
1156 | * protected against the tty being hung up. | |
1157 | */ | |
1158 | switch (cmd) { | |
1159 | case TIOCSERGETLSR: /* Get line status register */ | |
1160 | ret = uart_get_lsr_info(state, uarg); | |
1161 | break; | |
1162 | ||
1163 | default: { | |
46d57a44 AC |
1164 | struct uart_port *uport = state->uart_port; |
1165 | if (uport->ops->ioctl) | |
1166 | ret = uport->ops->ioctl(uport, cmd, arg); | |
1da177e4 LT |
1167 | break; |
1168 | } | |
1169 | } | |
f34d7a5b | 1170 | out_up: |
e2862f6a | 1171 | mutex_unlock(&state->mutex); |
f34d7a5b | 1172 | out: |
1da177e4 LT |
1173 | return ret; |
1174 | } | |
1175 | ||
edeb280e | 1176 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1177 | { |
1178 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1179 | struct uart_port *uport = state->uart_port; |
64e9159f | 1180 | |
46d57a44 AC |
1181 | if (uport->ops->set_ldisc) |
1182 | uport->ops->set_ldisc(uport); | |
64e9159f AC |
1183 | } |
1184 | ||
a46c9994 AC |
1185 | static void uart_set_termios(struct tty_struct *tty, |
1186 | struct ktermios *old_termios) | |
1da177e4 LT |
1187 | { |
1188 | struct uart_state *state = tty->driver_data; | |
1189 | unsigned long flags; | |
1190 | unsigned int cflag = tty->termios->c_cflag; | |
1191 | ||
1da177e4 LT |
1192 | |
1193 | /* | |
1194 | * These are the bits that are used to setup various | |
20620d68 DW |
1195 | * flags in the low level driver. We can ignore the Bfoo |
1196 | * bits in c_cflag; c_[io]speed will always be set | |
1197 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 LT |
1198 | */ |
1199 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
1da177e4 | 1200 | if ((cflag ^ old_termios->c_cflag) == 0 && |
20620d68 DW |
1201 | tty->termios->c_ospeed == old_termios->c_ospeed && |
1202 | tty->termios->c_ispeed == old_termios->c_ispeed && | |
e5238442 | 1203 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { |
1da177e4 | 1204 | return; |
e5238442 | 1205 | } |
1da177e4 LT |
1206 | |
1207 | uart_change_speed(state, old_termios); | |
1208 | ||
1209 | /* Handle transition to B0 status */ | |
1210 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
ebd2c8f6 | 1211 | uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); |
1da177e4 LT |
1212 | |
1213 | /* Handle transition away from B0 status */ | |
1214 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { | |
1215 | unsigned int mask = TIOCM_DTR; | |
1216 | if (!(cflag & CRTSCTS) || | |
1217 | !test_bit(TTY_THROTTLED, &tty->flags)) | |
1218 | mask |= TIOCM_RTS; | |
ebd2c8f6 | 1219 | uart_set_mctrl(state->uart_port, mask); |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | /* Handle turning off CRTSCTS */ | |
1223 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
ebd2c8f6 | 1224 | spin_lock_irqsave(&state->uart_port->lock, flags); |
1da177e4 LT |
1225 | tty->hw_stopped = 0; |
1226 | __uart_start(tty); | |
ebd2c8f6 | 1227 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
1da177e4 LT |
1228 | } |
1229 | ||
0dd7a1ae RK |
1230 | /* Handle turning on CRTSCTS */ |
1231 | if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { | |
ebd2c8f6 AC |
1232 | spin_lock_irqsave(&state->uart_port->lock, flags); |
1233 | if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { | |
0dd7a1ae | 1234 | tty->hw_stopped = 1; |
ebd2c8f6 | 1235 | state->uart_port->ops->stop_tx(state->uart_port); |
0dd7a1ae | 1236 | } |
ebd2c8f6 | 1237 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
0dd7a1ae | 1238 | } |
1da177e4 LT |
1239 | #if 0 |
1240 | /* | |
1241 | * No need to wake up processes in open wait, since they | |
1242 | * sample the CLOCAL flag once, and don't recheck it. | |
1243 | * XXX It's not clear whether the current behavior is correct | |
1244 | * or not. Hence, this may change..... | |
1245 | */ | |
1246 | if (!(old_termios->c_cflag & CLOCAL) && | |
1247 | (tty->termios->c_cflag & CLOCAL)) | |
ebd2c8f6 | 1248 | wake_up_interruptible(&state->uart_port.open_wait); |
1da177e4 LT |
1249 | #endif |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * In 2.4.5, calls to this will be serialized via the BKL in | |
1254 | * linux/drivers/char/tty_io.c:tty_release() | |
1255 | * linux/drivers/char/tty_io.c:do_tty_handup() | |
1256 | */ | |
1257 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1258 | { | |
1259 | struct uart_state *state = tty->driver_data; | |
46d57a44 AC |
1260 | struct tty_port *port; |
1261 | struct uart_port *uport; | |
a46c9994 | 1262 | |
1da177e4 LT |
1263 | BUG_ON(!kernel_locked()); |
1264 | ||
46d57a44 AC |
1265 | uport = state->uart_port; |
1266 | port = &state->port; | |
1da177e4 | 1267 | |
46d57a44 | 1268 | pr_debug("uart_close(%d) called\n", uport->line); |
1da177e4 | 1269 | |
e2862f6a | 1270 | mutex_lock(&state->mutex); |
1da177e4 LT |
1271 | |
1272 | if (tty_hung_up_p(filp)) | |
1273 | goto done; | |
1274 | ||
91312cdb | 1275 | if ((tty->count == 1) && (port->count != 1)) { |
1da177e4 LT |
1276 | /* |
1277 | * Uh, oh. tty->count is 1, which means that the tty | |
91312cdb | 1278 | * structure will be freed. port->count should always |
1da177e4 LT |
1279 | * be one in these conditions. If it's greater than |
1280 | * one, we've got real problems, since it means the | |
1281 | * serial port won't be shutdown. | |
1282 | */ | |
1283 | printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, " | |
91312cdb AC |
1284 | "port->count is %d\n", port->count); |
1285 | port->count = 1; | |
1da177e4 | 1286 | } |
91312cdb | 1287 | if (--port->count < 0) { |
1da177e4 | 1288 | printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n", |
91312cdb AC |
1289 | tty->name, port->count); |
1290 | port->count = 0; | |
1da177e4 | 1291 | } |
91312cdb | 1292 | if (port->count) |
1da177e4 LT |
1293 | goto done; |
1294 | ||
1295 | /* | |
1296 | * Now we wait for the transmit buffer to clear; and we notify | |
1297 | * the line discipline to only process XON/XOFF characters by | |
1298 | * setting tty->closing. | |
1299 | */ | |
1300 | tty->closing = 1; | |
1301 | ||
46d57a44 AC |
1302 | if (port->closing_wait != USF_CLOSING_WAIT_NONE) |
1303 | tty_wait_until_sent(tty, msecs_to_jiffies(port->closing_wait)); | |
1da177e4 LT |
1304 | |
1305 | /* | |
1306 | * At this point, we stop accepting input. To do this, we | |
1307 | * disable the receive line status interrupts. | |
1308 | */ | |
ebd2c8f6 | 1309 | if (state->flags & UIF_INITIALIZED) { |
1da177e4 LT |
1310 | unsigned long flags; |
1311 | spin_lock_irqsave(&port->lock, flags); | |
46d57a44 | 1312 | uport->ops->stop_rx(uport); |
1da177e4 LT |
1313 | spin_unlock_irqrestore(&port->lock, flags); |
1314 | /* | |
1315 | * Before we drop DTR, make sure the UART transmitter | |
1316 | * has completely drained; this is especially | |
1317 | * important if there is a transmit FIFO! | |
1318 | */ | |
46d57a44 | 1319 | uart_wait_until_sent(tty, uport->timeout); |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | uart_shutdown(state); | |
1323 | uart_flush_buffer(tty); | |
1324 | ||
a46c9994 AC |
1325 | tty_ldisc_flush(tty); |
1326 | ||
1da177e4 | 1327 | tty->closing = 0; |
46d57a44 | 1328 | port->tty = NULL; |
1da177e4 | 1329 | |
46d57a44 AC |
1330 | if (port->blocked_open) { |
1331 | if (port->close_delay) | |
1332 | msleep_interruptible(port->close_delay); | |
1333 | } else if (!uart_console(uport)) { | |
1da177e4 LT |
1334 | uart_change_pm(state, 3); |
1335 | } | |
1336 | ||
1337 | /* | |
1338 | * Wake up anyone trying to open this port. | |
1339 | */ | |
ebd2c8f6 | 1340 | state->flags &= ~UIF_NORMAL_ACTIVE; |
46d57a44 | 1341 | wake_up_interruptible(&port->open_wait); |
1da177e4 | 1342 | |
46d57a44 | 1343 | done: |
e2862f6a | 1344 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1345 | } |
1346 | ||
1347 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) | |
1348 | { | |
1349 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 1350 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
1351 | unsigned long char_time, expire; |
1352 | ||
1da177e4 LT |
1353 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1354 | return; | |
1355 | ||
f34d7a5b AC |
1356 | lock_kernel(); |
1357 | ||
1da177e4 LT |
1358 | /* |
1359 | * Set the check interval to be 1/5 of the estimated time to | |
1360 | * send a single character, and make it at least 1. The check | |
1361 | * interval should also be less than the timeout. | |
1362 | * | |
1363 | * Note: we have to use pretty tight timings here to satisfy | |
1364 | * the NIST-PCTS. | |
1365 | */ | |
1366 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1367 | char_time = char_time / 5; | |
1368 | if (char_time == 0) | |
1369 | char_time = 1; | |
1370 | if (timeout && timeout < char_time) | |
1371 | char_time = timeout; | |
1372 | ||
1373 | /* | |
1374 | * If the transmitter hasn't cleared in twice the approximate | |
1375 | * amount of time to send the entire FIFO, it probably won't | |
1376 | * ever clear. This assumes the UART isn't doing flow | |
1377 | * control, which is currently the case. Hence, if it ever | |
1378 | * takes longer than port->timeout, this is probably due to a | |
1379 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1380 | * 2*port->timeout. | |
1381 | */ | |
1382 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1383 | timeout = 2 * port->timeout; | |
1384 | ||
1385 | expire = jiffies + timeout; | |
1386 | ||
eb3a1e11 | 1387 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1388 | port->line, jiffies, expire); |
1da177e4 LT |
1389 | |
1390 | /* | |
1391 | * Check whether the transmitter is empty every 'char_time'. | |
1392 | * 'timeout' / 'expire' give us the maximum amount of time | |
1393 | * we wait. | |
1394 | */ | |
1395 | while (!port->ops->tx_empty(port)) { | |
1396 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1397 | if (signal_pending(current)) | |
1398 | break; | |
1399 | if (time_after(jiffies, expire)) | |
1400 | break; | |
1401 | } | |
1402 | set_current_state(TASK_RUNNING); /* might not be needed */ | |
f34d7a5b | 1403 | unlock_kernel(); |
1da177e4 LT |
1404 | } |
1405 | ||
1406 | /* | |
1407 | * This is called with the BKL held in | |
1408 | * linux/drivers/char/tty_io.c:do_tty_hangup() | |
1409 | * We're called from the eventd thread, so we can sleep for | |
1410 | * a _short_ time only. | |
1411 | */ | |
1412 | static void uart_hangup(struct tty_struct *tty) | |
1413 | { | |
1414 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1415 | struct tty_port *port = &state->port; |
1da177e4 LT |
1416 | |
1417 | BUG_ON(!kernel_locked()); | |
ebd2c8f6 | 1418 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
1da177e4 | 1419 | |
e2862f6a | 1420 | mutex_lock(&state->mutex); |
ebd2c8f6 | 1421 | if (state->flags & UIF_NORMAL_ACTIVE) { |
1da177e4 LT |
1422 | uart_flush_buffer(tty); |
1423 | uart_shutdown(state); | |
91312cdb | 1424 | port->count = 0; |
ebd2c8f6 | 1425 | state->flags &= ~UIF_NORMAL_ACTIVE; |
46d57a44 AC |
1426 | port->tty = NULL; |
1427 | wake_up_interruptible(&port->open_wait); | |
ebd2c8f6 | 1428 | wake_up_interruptible(&state->delta_msr_wait); |
1da177e4 | 1429 | } |
e2862f6a | 1430 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1431 | } |
1432 | ||
1433 | /* | |
1434 | * Copy across the serial console cflag setting into the termios settings | |
1435 | * for the initial open of the port. This allows continuity between the | |
1436 | * kernel settings, and the settings init adopts when it opens the port | |
1437 | * for the first time. | |
1438 | */ | |
1439 | static void uart_update_termios(struct uart_state *state) | |
1440 | { | |
ebd2c8f6 AC |
1441 | struct tty_struct *tty = state->port.tty; |
1442 | struct uart_port *port = state->uart_port; | |
1da177e4 LT |
1443 | |
1444 | if (uart_console(port) && port->cons->cflag) { | |
1445 | tty->termios->c_cflag = port->cons->cflag; | |
1446 | port->cons->cflag = 0; | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * If the device failed to grab its irq resources, | |
1451 | * or some other error occurred, don't try to talk | |
1452 | * to the port hardware. | |
1453 | */ | |
1454 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { | |
1455 | /* | |
1456 | * Make termios settings take effect. | |
1457 | */ | |
1458 | uart_change_speed(state, NULL); | |
1459 | ||
1460 | /* | |
1461 | * And finally enable the RTS and DTR signals. | |
1462 | */ | |
1463 | if (tty->termios->c_cflag & CBAUD) | |
1464 | uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | /* | |
1469 | * Block the open until the port is ready. We must be called with | |
1470 | * the per-port semaphore held. | |
1471 | */ | |
1472 | static int | |
1473 | uart_block_til_ready(struct file *filp, struct uart_state *state) | |
1474 | { | |
1475 | DECLARE_WAITQUEUE(wait, current); | |
46d57a44 AC |
1476 | struct uart_port *uport = state->uart_port; |
1477 | struct tty_port *port = &state->port; | |
c5f4644e | 1478 | unsigned int mctrl; |
1da177e4 | 1479 | |
46d57a44 | 1480 | port->blocked_open++; |
91312cdb | 1481 | port->count--; |
1da177e4 | 1482 | |
46d57a44 | 1483 | add_wait_queue(&port->open_wait, &wait); |
1da177e4 LT |
1484 | while (1) { |
1485 | set_current_state(TASK_INTERRUPTIBLE); | |
1486 | ||
1487 | /* | |
1488 | * If we have been hung up, tell userspace/restart open. | |
1489 | */ | |
46d57a44 | 1490 | if (tty_hung_up_p(filp) || port->tty == NULL) |
1da177e4 LT |
1491 | break; |
1492 | ||
1493 | /* | |
1494 | * If the port has been closed, tell userspace/restart open. | |
1495 | */ | |
ebd2c8f6 | 1496 | if (!(state->flags & UIF_INITIALIZED)) |
1da177e4 LT |
1497 | break; |
1498 | ||
1499 | /* | |
1500 | * If non-blocking mode is set, or CLOCAL mode is set, | |
1501 | * we don't want to wait for the modem status lines to | |
1502 | * indicate that the port is ready. | |
1503 | * | |
1504 | * Also, if the port is not enabled/configured, we want | |
1505 | * to allow the open to succeed here. Note that we will | |
1506 | * have set TTY_IO_ERROR for a non-existant port. | |
1507 | */ | |
1508 | if ((filp->f_flags & O_NONBLOCK) || | |
46d57a44 AC |
1509 | (port->tty->termios->c_cflag & CLOCAL) || |
1510 | (port->tty->flags & (1 << TTY_IO_ERROR))) | |
1da177e4 | 1511 | break; |
1da177e4 LT |
1512 | |
1513 | /* | |
1514 | * Set DTR to allow modem to know we're waiting. Do | |
1515 | * not set RTS here - we want to make sure we catch | |
1516 | * the data from the modem. | |
1517 | */ | |
46d57a44 AC |
1518 | if (port->tty->termios->c_cflag & CBAUD) |
1519 | uart_set_mctrl(uport, TIOCM_DTR); | |
1da177e4 LT |
1520 | |
1521 | /* | |
1522 | * and wait for the carrier to indicate that the | |
1523 | * modem is ready for us. | |
1524 | */ | |
46d57a44 AC |
1525 | spin_lock_irq(&uport->lock); |
1526 | uport->ops->enable_ms(uport); | |
1527 | mctrl = uport->ops->get_mctrl(uport); | |
1528 | spin_unlock_irq(&uport->lock); | |
c5f4644e | 1529 | if (mctrl & TIOCM_CAR) |
1da177e4 LT |
1530 | break; |
1531 | ||
e2862f6a | 1532 | mutex_unlock(&state->mutex); |
1da177e4 | 1533 | schedule(); |
e2862f6a | 1534 | mutex_lock(&state->mutex); |
1da177e4 LT |
1535 | |
1536 | if (signal_pending(current)) | |
1537 | break; | |
1538 | } | |
1539 | set_current_state(TASK_RUNNING); | |
46d57a44 | 1540 | remove_wait_queue(&port->open_wait, &wait); |
1da177e4 | 1541 | |
91312cdb | 1542 | port->count++; |
46d57a44 | 1543 | port->blocked_open--; |
1da177e4 LT |
1544 | |
1545 | if (signal_pending(current)) | |
1546 | return -ERESTARTSYS; | |
1547 | ||
46d57a44 | 1548 | if (!port->tty || tty_hung_up_p(filp)) |
1da177e4 LT |
1549 | return -EAGAIN; |
1550 | ||
1551 | return 0; | |
1552 | } | |
1553 | ||
1554 | static struct uart_state *uart_get(struct uart_driver *drv, int line) | |
1555 | { | |
1556 | struct uart_state *state; | |
68ac64cd | 1557 | int ret = 0; |
1da177e4 | 1558 | |
1da177e4 | 1559 | state = drv->state + line; |
e2862f6a | 1560 | if (mutex_lock_interruptible(&state->mutex)) { |
68ac64cd RK |
1561 | ret = -ERESTARTSYS; |
1562 | goto err; | |
1da177e4 LT |
1563 | } |
1564 | ||
91312cdb | 1565 | state->port.count++; |
ebd2c8f6 | 1566 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { |
68ac64cd RK |
1567 | ret = -ENXIO; |
1568 | goto err_unlock; | |
1da177e4 | 1569 | } |
1da177e4 | 1570 | return state; |
68ac64cd RK |
1571 | |
1572 | err_unlock: | |
91312cdb | 1573 | state->port.count--; |
68ac64cd RK |
1574 | mutex_unlock(&state->mutex); |
1575 | err: | |
1576 | return ERR_PTR(ret); | |
1da177e4 LT |
1577 | } |
1578 | ||
1579 | /* | |
922f9cfa DC |
1580 | * calls to uart_open are serialised by the BKL in |
1581 | * fs/char_dev.c:chrdev_open() | |
1da177e4 LT |
1582 | * Note that if this fails, then uart_close() _will_ be called. |
1583 | * | |
1584 | * In time, we want to scrap the "opening nonpresent ports" | |
1585 | * behaviour and implement an alternative way for setserial | |
1586 | * to set base addresses/ports/types. This will allow us to | |
1587 | * get rid of a certain amount of extra tests. | |
1588 | */ | |
1589 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1590 | { | |
1591 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1592 | struct uart_state *state; | |
91312cdb | 1593 | struct tty_port *port; |
1da177e4 LT |
1594 | int retval, line = tty->index; |
1595 | ||
1596 | BUG_ON(!kernel_locked()); | |
eb3a1e11 | 1597 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 LT |
1598 | |
1599 | /* | |
1600 | * tty->driver->num won't change, so we won't fail here with | |
1601 | * tty->driver_data set to something non-NULL (and therefore | |
1602 | * we won't get caught by uart_close()). | |
1603 | */ | |
1604 | retval = -ENODEV; | |
1605 | if (line >= tty->driver->num) | |
1606 | goto fail; | |
1607 | ||
1608 | /* | |
1609 | * We take the semaphore inside uart_get to guarantee that we won't | |
ebd2c8f6 | 1610 | * be re-entered while allocating the state structure, or while we |
1da177e4 LT |
1611 | * request any IRQs that the driver may need. This also has the nice |
1612 | * side-effect that it delays the action of uart_hangup, so we can | |
ebd2c8f6 AC |
1613 | * guarantee that state->port.tty will always contain something |
1614 | * reasonable. | |
1da177e4 LT |
1615 | */ |
1616 | state = uart_get(drv, line); | |
1617 | if (IS_ERR(state)) { | |
1618 | retval = PTR_ERR(state); | |
1619 | goto fail; | |
1620 | } | |
91312cdb | 1621 | port = &state->port; |
1da177e4 LT |
1622 | |
1623 | /* | |
1624 | * Once we set tty->driver_data here, we are guaranteed that | |
1625 | * uart_close() will decrement the driver module use count. | |
1626 | * Any failures from here onwards should not touch the count. | |
1627 | */ | |
1628 | tty->driver_data = state; | |
ebd2c8f6 AC |
1629 | state->uart_port->state = state; |
1630 | tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
1da177e4 | 1631 | tty->alt_speed = 0; |
91312cdb | 1632 | port->tty = tty; |
1da177e4 LT |
1633 | |
1634 | /* | |
1635 | * If the port is in the middle of closing, bail out now. | |
1636 | */ | |
1637 | if (tty_hung_up_p(filp)) { | |
1638 | retval = -EAGAIN; | |
91312cdb | 1639 | port->count--; |
e2862f6a | 1640 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1641 | goto fail; |
1642 | } | |
1643 | ||
1644 | /* | |
1645 | * Make sure the device is in D0 state. | |
1646 | */ | |
91312cdb | 1647 | if (port->count == 1) |
1da177e4 LT |
1648 | uart_change_pm(state, 0); |
1649 | ||
1650 | /* | |
1651 | * Start up the serial port. | |
1652 | */ | |
1653 | retval = uart_startup(state, 0); | |
1654 | ||
1655 | /* | |
1656 | * If we succeeded, wait until the port is ready. | |
1657 | */ | |
1658 | if (retval == 0) | |
1659 | retval = uart_block_til_ready(filp, state); | |
e2862f6a | 1660 | mutex_unlock(&state->mutex); |
1da177e4 LT |
1661 | |
1662 | /* | |
1663 | * If this is the first open to succeed, adjust things to suit. | |
1664 | */ | |
ebd2c8f6 AC |
1665 | if (retval == 0 && !(state->flags & UIF_NORMAL_ACTIVE)) { |
1666 | state->flags |= UIF_NORMAL_ACTIVE; | |
1da177e4 LT |
1667 | |
1668 | uart_update_termios(state); | |
1669 | } | |
1670 | ||
1671 | fail: | |
1672 | return retval; | |
1673 | } | |
1674 | ||
1675 | static const char *uart_type(struct uart_port *port) | |
1676 | { | |
1677 | const char *str = NULL; | |
1678 | ||
1679 | if (port->ops->type) | |
1680 | str = port->ops->type(port); | |
1681 | ||
1682 | if (!str) | |
1683 | str = "unknown"; | |
1684 | ||
1685 | return str; | |
1686 | } | |
1687 | ||
1688 | #ifdef CONFIG_PROC_FS | |
1689 | ||
d196a949 | 1690 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1da177e4 LT |
1691 | { |
1692 | struct uart_state *state = drv->state + i; | |
3689a0ec | 1693 | int pm_state; |
ebd2c8f6 | 1694 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
1695 | char stat_buf[32]; |
1696 | unsigned int status; | |
d196a949 | 1697 | int mmio; |
1da177e4 LT |
1698 | |
1699 | if (!port) | |
d196a949 | 1700 | return; |
1da177e4 | 1701 | |
6c6a2334 | 1702 | mmio = port->iotype >= UPIO_MEM; |
d196a949 | 1703 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
1da177e4 | 1704 | port->line, uart_type(port), |
6c6a2334 | 1705 | mmio ? "mmio:0x" : "port:", |
4f640efb | 1706 | mmio ? (unsigned long long)port->mapbase |
a46c9994 | 1707 | : (unsigned long long) port->iobase, |
1da177e4 LT |
1708 | port->irq); |
1709 | ||
1710 | if (port->type == PORT_UNKNOWN) { | |
d196a949 AD |
1711 | seq_putc(m, '\n'); |
1712 | return; | |
1da177e4 LT |
1713 | } |
1714 | ||
a46c9994 | 1715 | if (capable(CAP_SYS_ADMIN)) { |
3689a0ec GD |
1716 | mutex_lock(&state->mutex); |
1717 | pm_state = state->pm_state; | |
1718 | if (pm_state) | |
1719 | uart_change_pm(state, 0); | |
c5f4644e | 1720 | spin_lock_irq(&port->lock); |
1da177e4 | 1721 | status = port->ops->get_mctrl(port); |
c5f4644e | 1722 | spin_unlock_irq(&port->lock); |
3689a0ec GD |
1723 | if (pm_state) |
1724 | uart_change_pm(state, pm_state); | |
1725 | mutex_unlock(&state->mutex); | |
1da177e4 | 1726 | |
d196a949 | 1727 | seq_printf(m, " tx:%d rx:%d", |
1da177e4 LT |
1728 | port->icount.tx, port->icount.rx); |
1729 | if (port->icount.frame) | |
d196a949 | 1730 | seq_printf(m, " fe:%d", |
1da177e4 LT |
1731 | port->icount.frame); |
1732 | if (port->icount.parity) | |
d196a949 | 1733 | seq_printf(m, " pe:%d", |
1da177e4 LT |
1734 | port->icount.parity); |
1735 | if (port->icount.brk) | |
d196a949 | 1736 | seq_printf(m, " brk:%d", |
1da177e4 LT |
1737 | port->icount.brk); |
1738 | if (port->icount.overrun) | |
d196a949 | 1739 | seq_printf(m, " oe:%d", |
1da177e4 | 1740 | port->icount.overrun); |
a46c9994 AC |
1741 | |
1742 | #define INFOBIT(bit, str) \ | |
1da177e4 LT |
1743 | if (port->mctrl & (bit)) \ |
1744 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1745 | strlen(stat_buf) - 2) | |
a46c9994 | 1746 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1747 | if (status & (bit)) \ |
1748 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1749 | strlen(stat_buf) - 2) | |
1750 | ||
1751 | stat_buf[0] = '\0'; | |
1752 | stat_buf[1] = '\0'; | |
1753 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1754 | STATBIT(TIOCM_CTS, "|CTS"); | |
1755 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1756 | STATBIT(TIOCM_DSR, "|DSR"); | |
1757 | STATBIT(TIOCM_CAR, "|CD"); | |
1758 | STATBIT(TIOCM_RNG, "|RI"); | |
1759 | if (stat_buf[0]) | |
1760 | stat_buf[0] = ' '; | |
a46c9994 | 1761 | |
d196a949 | 1762 | seq_puts(m, stat_buf); |
1da177e4 | 1763 | } |
d196a949 | 1764 | seq_putc(m, '\n'); |
1da177e4 LT |
1765 | #undef STATBIT |
1766 | #undef INFOBIT | |
1da177e4 LT |
1767 | } |
1768 | ||
d196a949 | 1769 | static int uart_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1770 | { |
833bb304 | 1771 | struct tty_driver *ttydrv = m->private; |
1da177e4 | 1772 | struct uart_driver *drv = ttydrv->driver_state; |
d196a949 | 1773 | int i; |
1da177e4 | 1774 | |
d196a949 | 1775 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
1da177e4 | 1776 | "", "", ""); |
d196a949 AD |
1777 | for (i = 0; i < drv->nr; i++) |
1778 | uart_line_info(m, drv, i); | |
1779 | return 0; | |
1da177e4 | 1780 | } |
d196a949 AD |
1781 | |
1782 | static int uart_proc_open(struct inode *inode, struct file *file) | |
1783 | { | |
1784 | return single_open(file, uart_proc_show, PDE(inode)->data); | |
1785 | } | |
1786 | ||
1787 | static const struct file_operations uart_proc_fops = { | |
1788 | .owner = THIS_MODULE, | |
1789 | .open = uart_proc_open, | |
1790 | .read = seq_read, | |
1791 | .llseek = seq_lseek, | |
1792 | .release = single_release, | |
1793 | }; | |
1da177e4 LT |
1794 | #endif |
1795 | ||
4a1b5502 | 1796 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1797 | /* |
1798 | * uart_console_write - write a console message to a serial port | |
1799 | * @port: the port to write the message | |
1800 | * @s: array of characters | |
1801 | * @count: number of characters in string to write | |
1802 | * @write: function to write character to port | |
1803 | */ | |
1804 | void uart_console_write(struct uart_port *port, const char *s, | |
1805 | unsigned int count, | |
1806 | void (*putchar)(struct uart_port *, int)) | |
1807 | { | |
1808 | unsigned int i; | |
1809 | ||
1810 | for (i = 0; i < count; i++, s++) { | |
1811 | if (*s == '\n') | |
1812 | putchar(port, '\r'); | |
1813 | putchar(port, *s); | |
1814 | } | |
1815 | } | |
1816 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1817 | ||
1da177e4 LT |
1818 | /* |
1819 | * Check whether an invalid uart number has been specified, and | |
1820 | * if so, search for the first available port that does have | |
1821 | * console support. | |
1822 | */ | |
1823 | struct uart_port * __init | |
1824 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1825 | { | |
1826 | int idx = co->index; | |
1827 | ||
1828 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1829 | ports[idx].membase == NULL)) | |
1830 | for (idx = 0; idx < nr; idx++) | |
1831 | if (ports[idx].iobase != 0 || | |
1832 | ports[idx].membase != NULL) | |
1833 | break; | |
1834 | ||
1835 | co->index = idx; | |
1836 | ||
1837 | return ports + idx; | |
1838 | } | |
1839 | ||
1840 | /** | |
1841 | * uart_parse_options - Parse serial port baud/parity/bits/flow contro. | |
1842 | * @options: pointer to option string | |
1843 | * @baud: pointer to an 'int' variable for the baud rate. | |
1844 | * @parity: pointer to an 'int' variable for the parity. | |
1845 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1846 | * @flow: pointer to an 'int' variable for the flow control character. | |
1847 | * | |
1848 | * uart_parse_options decodes a string containing the serial console | |
1849 | * options. The format of the string is <baud><parity><bits><flow>, | |
1850 | * eg: 115200n8r | |
1851 | */ | |
f2d937f3 | 1852 | void |
1da177e4 LT |
1853 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1854 | { | |
1855 | char *s = options; | |
1856 | ||
1857 | *baud = simple_strtoul(s, NULL, 10); | |
1858 | while (*s >= '0' && *s <= '9') | |
1859 | s++; | |
1860 | if (*s) | |
1861 | *parity = *s++; | |
1862 | if (*s) | |
1863 | *bits = *s++ - '0'; | |
1864 | if (*s) | |
1865 | *flow = *s; | |
1866 | } | |
f2d937f3 | 1867 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1868 | |
1869 | struct baud_rates { | |
1870 | unsigned int rate; | |
1871 | unsigned int cflag; | |
1872 | }; | |
1873 | ||
cb3592be | 1874 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1875 | { 921600, B921600 }, |
1876 | { 460800, B460800 }, | |
1877 | { 230400, B230400 }, | |
1878 | { 115200, B115200 }, | |
1879 | { 57600, B57600 }, | |
1880 | { 38400, B38400 }, | |
1881 | { 19200, B19200 }, | |
1882 | { 9600, B9600 }, | |
1883 | { 4800, B4800 }, | |
1884 | { 2400, B2400 }, | |
1885 | { 1200, B1200 }, | |
1886 | { 0, B38400 } | |
1887 | }; | |
1888 | ||
1889 | /** | |
1890 | * uart_set_options - setup the serial console parameters | |
1891 | * @port: pointer to the serial ports uart_port structure | |
1892 | * @co: console pointer | |
1893 | * @baud: baud rate | |
1894 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1895 | * @bits: number of data bits | |
1896 | * @flow: flow control character - 'r' (rts) | |
1897 | */ | |
f2d937f3 | 1898 | int |
1da177e4 LT |
1899 | uart_set_options(struct uart_port *port, struct console *co, |
1900 | int baud, int parity, int bits, int flow) | |
1901 | { | |
606d099c | 1902 | struct ktermios termios; |
149b36ea | 1903 | static struct ktermios dummy; |
1da177e4 LT |
1904 | int i; |
1905 | ||
976ecd12 RK |
1906 | /* |
1907 | * Ensure that the serial console lock is initialised | |
1908 | * early. | |
1909 | */ | |
1910 | spin_lock_init(&port->lock); | |
13e83599 | 1911 | lockdep_set_class(&port->lock, &port_lock_key); |
976ecd12 | 1912 | |
606d099c | 1913 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1914 | |
1915 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1916 | ||
1917 | /* | |
1918 | * Construct a cflag setting. | |
1919 | */ | |
1920 | for (i = 0; baud_rates[i].rate; i++) | |
1921 | if (baud_rates[i].rate <= baud) | |
1922 | break; | |
1923 | ||
1924 | termios.c_cflag |= baud_rates[i].cflag; | |
1925 | ||
1926 | if (bits == 7) | |
1927 | termios.c_cflag |= CS7; | |
1928 | else | |
1929 | termios.c_cflag |= CS8; | |
1930 | ||
1931 | switch (parity) { | |
1932 | case 'o': case 'O': | |
1933 | termios.c_cflag |= PARODD; | |
1934 | /*fall through*/ | |
1935 | case 'e': case 'E': | |
1936 | termios.c_cflag |= PARENB; | |
1937 | break; | |
1938 | } | |
1939 | ||
1940 | if (flow == 'r') | |
1941 | termios.c_cflag |= CRTSCTS; | |
1942 | ||
79492689 YL |
1943 | /* |
1944 | * some uarts on other side don't support no flow control. | |
1945 | * So we set * DTR in host uart to make them happy | |
1946 | */ | |
1947 | port->mctrl |= TIOCM_DTR; | |
1948 | ||
149b36ea | 1949 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1950 | /* |
1951 | * Allow the setting of the UART parameters with a NULL console | |
1952 | * too: | |
1953 | */ | |
1954 | if (co) | |
1955 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1956 | |
1957 | return 0; | |
1958 | } | |
f2d937f3 | 1959 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1960 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1961 | ||
1962 | static void uart_change_pm(struct uart_state *state, int pm_state) | |
1963 | { | |
ebd2c8f6 | 1964 | struct uart_port *port = state->uart_port; |
1281e360 AV |
1965 | |
1966 | if (state->pm_state != pm_state) { | |
1967 | if (port->ops->pm) | |
1968 | port->ops->pm(port, pm_state, state->pm_state); | |
1969 | state->pm_state = pm_state; | |
1970 | } | |
1da177e4 LT |
1971 | } |
1972 | ||
b3b708fa GL |
1973 | struct uart_match { |
1974 | struct uart_port *port; | |
1975 | struct uart_driver *driver; | |
1976 | }; | |
1977 | ||
1978 | static int serial_match_port(struct device *dev, void *data) | |
1979 | { | |
1980 | struct uart_match *match = data; | |
7ca796f4 GL |
1981 | struct tty_driver *tty_drv = match->driver->tty_driver; |
1982 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
1983 | match->port->line; | |
b3b708fa GL |
1984 | |
1985 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1986 | } | |
1987 | ||
1da177e4 LT |
1988 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *port) |
1989 | { | |
1990 | struct uart_state *state = drv->state + port->line; | |
b3b708fa GL |
1991 | struct device *tty_dev; |
1992 | struct uart_match match = {port, drv}; | |
1da177e4 | 1993 | |
e2862f6a | 1994 | mutex_lock(&state->mutex); |
1da177e4 | 1995 | |
8f4ce8c3 AS |
1996 | if (!console_suspend_enabled && uart_console(port)) { |
1997 | /* we're going to avoid suspending serial console */ | |
e1da95ae RW |
1998 | mutex_unlock(&state->mutex); |
1999 | return 0; | |
2000 | } | |
e1da95ae | 2001 | |
b3b708fa GL |
2002 | tty_dev = device_find_child(port->dev, &match, serial_match_port); |
2003 | if (device_may_wakeup(tty_dev)) { | |
2004 | enable_irq_wake(port->irq); | |
2005 | put_device(tty_dev); | |
2006 | mutex_unlock(&state->mutex); | |
2007 | return 0; | |
2008 | } | |
2009 | port->suspended = 1; | |
2010 | ||
ebd2c8f6 | 2011 | if (state->flags & UIF_INITIALIZED) { |
ba899dbc | 2012 | const struct uart_ops *ops = port->ops; |
c8c6bfa3 | 2013 | int tries; |
1da177e4 | 2014 | |
ebd2c8f6 | 2015 | state->flags = (state->flags & ~UIF_INITIALIZED) |
a6b93a90 RK |
2016 | | UIF_SUSPENDED; |
2017 | ||
1da177e4 | 2018 | spin_lock_irq(&port->lock); |
b129a8cc | 2019 | ops->stop_tx(port); |
1da177e4 LT |
2020 | ops->set_mctrl(port, 0); |
2021 | ops->stop_rx(port); | |
2022 | spin_unlock_irq(&port->lock); | |
2023 | ||
2024 | /* | |
2025 | * Wait for the transmitter to empty. | |
2026 | */ | |
a46c9994 | 2027 | for (tries = 3; !ops->tx_empty(port) && tries; tries--) |
1da177e4 | 2028 | msleep(10); |
c8c6bfa3 | 2029 | if (!tries) |
a46c9994 AC |
2030 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
2031 | "transmitter\n", | |
4bfe090b | 2032 | port->dev ? dev_name(port->dev) : "", |
c8c6bfa3 | 2033 | port->dev ? ": " : "", |
8440838b DM |
2034 | drv->dev_name, |
2035 | drv->tty_driver->name_base + port->line); | |
1da177e4 LT |
2036 | |
2037 | ops->shutdown(port); | |
2038 | } | |
2039 | ||
2040 | /* | |
2041 | * Disable the console device before suspending. | |
2042 | */ | |
2043 | if (uart_console(port)) | |
2044 | console_stop(port->cons); | |
2045 | ||
2046 | uart_change_pm(state, 3); | |
2047 | ||
e2862f6a | 2048 | mutex_unlock(&state->mutex); |
1da177e4 LT |
2049 | |
2050 | return 0; | |
2051 | } | |
2052 | ||
2053 | int uart_resume_port(struct uart_driver *drv, struct uart_port *port) | |
2054 | { | |
2055 | struct uart_state *state = drv->state + port->line; | |
03a74dcc AV |
2056 | struct device *tty_dev; |
2057 | struct uart_match match = {port, drv}; | |
1da177e4 | 2058 | |
e2862f6a | 2059 | mutex_lock(&state->mutex); |
1da177e4 | 2060 | |
8f4ce8c3 AS |
2061 | if (!console_suspend_enabled && uart_console(port)) { |
2062 | /* no need to resume serial console, it wasn't suspended */ | |
e1da95ae RW |
2063 | mutex_unlock(&state->mutex); |
2064 | return 0; | |
2065 | } | |
e1da95ae | 2066 | |
03a74dcc AV |
2067 | tty_dev = device_find_child(port->dev, &match, serial_match_port); |
2068 | if (!port->suspended && device_may_wakeup(tty_dev)) { | |
b3b708fa GL |
2069 | disable_irq_wake(port->irq); |
2070 | mutex_unlock(&state->mutex); | |
2071 | return 0; | |
2072 | } | |
2073 | port->suspended = 0; | |
2074 | ||
1da177e4 LT |
2075 | /* |
2076 | * Re-enable the console device after suspending. | |
2077 | */ | |
2078 | if (uart_console(port)) { | |
606d099c | 2079 | struct ktermios termios; |
1da177e4 LT |
2080 | |
2081 | /* | |
2082 | * First try to use the console cflag setting. | |
2083 | */ | |
606d099c | 2084 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
2085 | termios.c_cflag = port->cons->cflag; |
2086 | ||
2087 | /* | |
2088 | * If that's unset, use the tty termios setting. | |
2089 | */ | |
ebd2c8f6 AC |
2090 | if (state->port.tty && termios.c_cflag == 0) |
2091 | termios = *state->port.tty->termios; | |
1da177e4 | 2092 | |
9d778a69 | 2093 | uart_change_pm(state, 0); |
1da177e4 LT |
2094 | port->ops->set_termios(port, &termios, NULL); |
2095 | console_start(port->cons); | |
2096 | } | |
2097 | ||
ebd2c8f6 | 2098 | if (state->flags & UIF_SUSPENDED) { |
ba899dbc | 2099 | const struct uart_ops *ops = port->ops; |
ee31b337 | 2100 | int ret; |
1da177e4 | 2101 | |
9d778a69 | 2102 | uart_change_pm(state, 0); |
f34d7a5b | 2103 | spin_lock_irq(&port->lock); |
1da177e4 | 2104 | ops->set_mctrl(port, 0); |
f34d7a5b | 2105 | spin_unlock_irq(&port->lock); |
ee31b337 RK |
2106 | ret = ops->startup(port); |
2107 | if (ret == 0) { | |
2108 | uart_change_speed(state, NULL); | |
2109 | spin_lock_irq(&port->lock); | |
2110 | ops->set_mctrl(port, port->mctrl); | |
2111 | ops->start_tx(port); | |
2112 | spin_unlock_irq(&port->lock); | |
ebd2c8f6 | 2113 | state->flags |= UIF_INITIALIZED; |
ee31b337 RK |
2114 | } else { |
2115 | /* | |
2116 | * Failed to resume - maybe hardware went away? | |
2117 | * Clear the "initialized" flag so we won't try | |
2118 | * to call the low level drivers shutdown method. | |
2119 | */ | |
ee31b337 RK |
2120 | uart_shutdown(state); |
2121 | } | |
a6b93a90 | 2122 | |
ebd2c8f6 | 2123 | state->flags &= ~UIF_SUSPENDED; |
1da177e4 LT |
2124 | } |
2125 | ||
e2862f6a | 2126 | mutex_unlock(&state->mutex); |
1da177e4 LT |
2127 | |
2128 | return 0; | |
2129 | } | |
2130 | ||
2131 | static inline void | |
2132 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2133 | { | |
30b7a3bc RK |
2134 | char address[64]; |
2135 | ||
1da177e4 LT |
2136 | switch (port->iotype) { |
2137 | case UPIO_PORT: | |
9bde10a4 | 2138 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2139 | break; |
2140 | case UPIO_HUB6: | |
30b7a3bc | 2141 | snprintf(address, sizeof(address), |
9bde10a4 | 2142 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2143 | break; |
2144 | case UPIO_MEM: | |
2145 | case UPIO_MEM32: | |
21c614a7 | 2146 | case UPIO_AU: |
3be91ec7 | 2147 | case UPIO_TSI: |
beab697a | 2148 | case UPIO_DWAPB: |
30b7a3bc | 2149 | snprintf(address, sizeof(address), |
4f640efb | 2150 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2151 | break; |
2152 | default: | |
2153 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2154 | break; |
2155 | } | |
30b7a3bc | 2156 | |
0cf669d5 | 2157 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", |
4bfe090b | 2158 | port->dev ? dev_name(port->dev) : "", |
0cf669d5 | 2159 | port->dev ? ": " : "", |
8440838b DM |
2160 | drv->dev_name, |
2161 | drv->tty_driver->name_base + port->line, | |
2162 | address, port->irq, uart_type(port)); | |
1da177e4 LT |
2163 | } |
2164 | ||
2165 | static void | |
2166 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2167 | struct uart_port *port) | |
2168 | { | |
2169 | unsigned int flags; | |
2170 | ||
2171 | /* | |
2172 | * If there isn't a port here, don't do anything further. | |
2173 | */ | |
2174 | if (!port->iobase && !port->mapbase && !port->membase) | |
2175 | return; | |
2176 | ||
2177 | /* | |
2178 | * Now do the auto configuration stuff. Note that config_port | |
2179 | * is expected to claim the resources and map the port for us. | |
2180 | */ | |
8e23fcc8 | 2181 | flags = 0; |
1da177e4 LT |
2182 | if (port->flags & UPF_AUTO_IRQ) |
2183 | flags |= UART_CONFIG_IRQ; | |
2184 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2185 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2186 | port->type = PORT_UNKNOWN; | |
2187 | flags |= UART_CONFIG_TYPE; | |
2188 | } | |
1da177e4 LT |
2189 | port->ops->config_port(port, flags); |
2190 | } | |
2191 | ||
2192 | if (port->type != PORT_UNKNOWN) { | |
2193 | unsigned long flags; | |
2194 | ||
2195 | uart_report_port(drv, port); | |
2196 | ||
3689a0ec GD |
2197 | /* Power up port for set_mctrl() */ |
2198 | uart_change_pm(state, 0); | |
2199 | ||
1da177e4 LT |
2200 | /* |
2201 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2202 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2203 | * We probably don't need a spinlock around this, but |
2204 | */ | |
2205 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2206 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2207 | spin_unlock_irqrestore(&port->lock, flags); |
2208 | ||
97d97224 RK |
2209 | /* |
2210 | * If this driver supports console, and it hasn't been | |
2211 | * successfully registered yet, try to re-register it. | |
2212 | * It may be that the port was not available. | |
2213 | */ | |
2214 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2215 | register_console(port->cons); | |
2216 | ||
1da177e4 LT |
2217 | /* |
2218 | * Power down all ports by default, except the | |
2219 | * console if we have one. | |
2220 | */ | |
2221 | if (!uart_console(port)) | |
2222 | uart_change_pm(state, 3); | |
2223 | } | |
2224 | } | |
2225 | ||
f2d937f3 JW |
2226 | #ifdef CONFIG_CONSOLE_POLL |
2227 | ||
2228 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2229 | { | |
2230 | struct uart_driver *drv = driver->driver_state; | |
2231 | struct uart_state *state = drv->state + line; | |
2232 | struct uart_port *port; | |
2233 | int baud = 9600; | |
2234 | int bits = 8; | |
2235 | int parity = 'n'; | |
2236 | int flow = 'n'; | |
2237 | ||
ebd2c8f6 | 2238 | if (!state || !state->uart_port) |
f2d937f3 JW |
2239 | return -1; |
2240 | ||
ebd2c8f6 | 2241 | port = state->uart_port; |
f2d937f3 JW |
2242 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
2243 | return -1; | |
2244 | ||
2245 | if (options) { | |
2246 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2247 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2248 | } | |
2249 | ||
2250 | return 0; | |
2251 | } | |
2252 | ||
2253 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2254 | { | |
2255 | struct uart_driver *drv = driver->driver_state; | |
2256 | struct uart_state *state = drv->state + line; | |
2257 | struct uart_port *port; | |
2258 | ||
ebd2c8f6 | 2259 | if (!state || !state->uart_port) |
f2d937f3 JW |
2260 | return -1; |
2261 | ||
ebd2c8f6 | 2262 | port = state->uart_port; |
f2d937f3 JW |
2263 | return port->ops->poll_get_char(port); |
2264 | } | |
2265 | ||
2266 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2267 | { | |
2268 | struct uart_driver *drv = driver->driver_state; | |
2269 | struct uart_state *state = drv->state + line; | |
2270 | struct uart_port *port; | |
2271 | ||
ebd2c8f6 | 2272 | if (!state || !state->uart_port) |
f2d937f3 JW |
2273 | return; |
2274 | ||
ebd2c8f6 | 2275 | port = state->uart_port; |
f2d937f3 JW |
2276 | port->ops->poll_put_char(port, ch); |
2277 | } | |
2278 | #endif | |
2279 | ||
b68e31d0 | 2280 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2281 | .open = uart_open, |
2282 | .close = uart_close, | |
2283 | .write = uart_write, | |
2284 | .put_char = uart_put_char, | |
2285 | .flush_chars = uart_flush_chars, | |
2286 | .write_room = uart_write_room, | |
2287 | .chars_in_buffer= uart_chars_in_buffer, | |
2288 | .flush_buffer = uart_flush_buffer, | |
2289 | .ioctl = uart_ioctl, | |
2290 | .throttle = uart_throttle, | |
2291 | .unthrottle = uart_unthrottle, | |
2292 | .send_xchar = uart_send_xchar, | |
2293 | .set_termios = uart_set_termios, | |
64e9159f | 2294 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2295 | .stop = uart_stop, |
2296 | .start = uart_start, | |
2297 | .hangup = uart_hangup, | |
2298 | .break_ctl = uart_break_ctl, | |
2299 | .wait_until_sent= uart_wait_until_sent, | |
2300 | #ifdef CONFIG_PROC_FS | |
d196a949 | 2301 | .proc_fops = &uart_proc_fops, |
1da177e4 LT |
2302 | #endif |
2303 | .tiocmget = uart_tiocmget, | |
2304 | .tiocmset = uart_tiocmset, | |
f2d937f3 JW |
2305 | #ifdef CONFIG_CONSOLE_POLL |
2306 | .poll_init = uart_poll_init, | |
2307 | .poll_get_char = uart_poll_get_char, | |
2308 | .poll_put_char = uart_poll_put_char, | |
2309 | #endif | |
1da177e4 LT |
2310 | }; |
2311 | ||
2312 | /** | |
2313 | * uart_register_driver - register a driver with the uart core layer | |
2314 | * @drv: low level driver structure | |
2315 | * | |
2316 | * Register a uart driver with the core driver. We in turn register | |
2317 | * with the tty layer, and initialise the core driver per-port state. | |
2318 | * | |
2319 | * We have a proc file in /proc/tty/driver which is named after the | |
2320 | * normal driver. | |
2321 | * | |
2322 | * drv->port should be NULL, and the per-port structures should be | |
2323 | * registered using uart_add_one_port after this call has succeeded. | |
2324 | */ | |
2325 | int uart_register_driver(struct uart_driver *drv) | |
2326 | { | |
2327 | struct tty_driver *normal = NULL; | |
2328 | int i, retval; | |
2329 | ||
2330 | BUG_ON(drv->state); | |
2331 | ||
2332 | /* | |
2333 | * Maybe we should be using a slab cache for this, especially if | |
2334 | * we have a large number of ports to handle. | |
2335 | */ | |
8f31bb39 | 2336 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2337 | retval = -ENOMEM; |
2338 | if (!drv->state) | |
2339 | goto out; | |
2340 | ||
1da177e4 LT |
2341 | normal = alloc_tty_driver(drv->nr); |
2342 | if (!normal) | |
2343 | goto out; | |
2344 | ||
2345 | drv->tty_driver = normal; | |
2346 | ||
2347 | normal->owner = drv->owner; | |
2348 | normal->driver_name = drv->driver_name; | |
1da177e4 LT |
2349 | normal->name = drv->dev_name; |
2350 | normal->major = drv->major; | |
2351 | normal->minor_start = drv->minor; | |
2352 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2353 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2354 | normal->init_termios = tty_std_termios; | |
2355 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2356 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2357 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2358 | normal->driver_state = drv; |
2359 | tty_set_operations(normal, &uart_ops); | |
2360 | ||
2361 | /* | |
2362 | * Initialise the UART state(s). | |
2363 | */ | |
2364 | for (i = 0; i < drv->nr; i++) { | |
2365 | struct uart_state *state = drv->state + i; | |
2366 | ||
e2862f6a | 2367 | mutex_init(&state->mutex); |
f751928e | 2368 | |
ebd2c8f6 | 2369 | tty_port_init(&state->port); |
5e99df56 AC |
2370 | state->port.close_delay = 500; /* .5 seconds */ |
2371 | state->port.closing_wait = 30000; /* 30 seconds */ | |
ebd2c8f6 AC |
2372 | init_waitqueue_head(&state->delta_msr_wait); |
2373 | tasklet_init(&state->tlet, uart_tasklet_action, | |
f751928e | 2374 | (unsigned long)state); |
1da177e4 LT |
2375 | } |
2376 | ||
2377 | retval = tty_register_driver(normal); | |
2378 | out: | |
2379 | if (retval < 0) { | |
2380 | put_tty_driver(normal); | |
2381 | kfree(drv->state); | |
2382 | } | |
2383 | return retval; | |
2384 | } | |
2385 | ||
2386 | /** | |
2387 | * uart_unregister_driver - remove a driver from the uart core layer | |
2388 | * @drv: low level driver structure | |
2389 | * | |
2390 | * Remove all references to a driver from the core driver. The low | |
2391 | * level driver must have removed all its ports via the | |
2392 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2393 | * (ie, drv->port == NULL) | |
2394 | */ | |
2395 | void uart_unregister_driver(struct uart_driver *drv) | |
2396 | { | |
2397 | struct tty_driver *p = drv->tty_driver; | |
2398 | tty_unregister_driver(p); | |
2399 | put_tty_driver(p); | |
2400 | kfree(drv->state); | |
2401 | drv->tty_driver = NULL; | |
2402 | } | |
2403 | ||
2404 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2405 | { | |
2406 | struct uart_driver *p = co->data; | |
2407 | *index = co->index; | |
2408 | return p->tty_driver; | |
2409 | } | |
2410 | ||
2411 | /** | |
2412 | * uart_add_one_port - attach a driver-defined port structure | |
2413 | * @drv: pointer to the uart low level driver structure for this port | |
2414 | * @port: uart port structure to use for this port. | |
2415 | * | |
2416 | * This allows the driver to register its own uart_port structure | |
2417 | * with the core driver. The main purpose is to allow the low | |
2418 | * level uart drivers to expand uart_port, rather than having yet | |
2419 | * more levels of structures. | |
2420 | */ | |
2421 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *port) | |
2422 | { | |
2423 | struct uart_state *state; | |
2424 | int ret = 0; | |
b3b708fa | 2425 | struct device *tty_dev; |
1da177e4 LT |
2426 | |
2427 | BUG_ON(in_interrupt()); | |
2428 | ||
2429 | if (port->line >= drv->nr) | |
2430 | return -EINVAL; | |
2431 | ||
2432 | state = drv->state + port->line; | |
2433 | ||
f392ecfa | 2434 | mutex_lock(&port_mutex); |
68ac64cd | 2435 | mutex_lock(&state->mutex); |
ebd2c8f6 | 2436 | if (state->uart_port) { |
1da177e4 LT |
2437 | ret = -EINVAL; |
2438 | goto out; | |
2439 | } | |
2440 | ||
ebd2c8f6 | 2441 | state->uart_port = port; |
97d97224 | 2442 | state->pm_state = -1; |
1da177e4 | 2443 | |
1da177e4 | 2444 | port->cons = drv->cons; |
ebd2c8f6 | 2445 | port->state = state; |
1da177e4 | 2446 | |
976ecd12 RK |
2447 | /* |
2448 | * If this port is a console, then the spinlock is already | |
2449 | * initialised. | |
2450 | */ | |
13e83599 | 2451 | if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { |
976ecd12 | 2452 | spin_lock_init(&port->lock); |
13e83599 IM |
2453 | lockdep_set_class(&port->lock, &port_lock_key); |
2454 | } | |
976ecd12 | 2455 | |
1da177e4 LT |
2456 | uart_configure_port(drv, state, port); |
2457 | ||
2458 | /* | |
2459 | * Register the port whether it's detected or not. This allows | |
2460 | * setserial to be used to alter this ports parameters. | |
2461 | */ | |
b3b708fa GL |
2462 | tty_dev = tty_register_device(drv->tty_driver, port->line, port->dev); |
2463 | if (likely(!IS_ERR(tty_dev))) { | |
74081f86 | 2464 | device_init_wakeup(tty_dev, 1); |
b3b708fa GL |
2465 | device_set_wakeup_enable(tty_dev, 0); |
2466 | } else | |
2467 | printk(KERN_ERR "Cannot register tty device on line %d\n", | |
2468 | port->line); | |
1da177e4 | 2469 | |
68ac64cd RK |
2470 | /* |
2471 | * Ensure UPF_DEAD is not set. | |
2472 | */ | |
2473 | port->flags &= ~UPF_DEAD; | |
2474 | ||
1da177e4 | 2475 | out: |
68ac64cd | 2476 | mutex_unlock(&state->mutex); |
f392ecfa | 2477 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2478 | |
2479 | return ret; | |
2480 | } | |
2481 | ||
2482 | /** | |
2483 | * uart_remove_one_port - detach a driver defined port structure | |
2484 | * @drv: pointer to the uart low level driver structure for this port | |
2485 | * @port: uart port structure for this port | |
2486 | * | |
2487 | * This unhooks (and hangs up) the specified port structure from the | |
2488 | * core driver. No further calls will be made to the low-level code | |
2489 | * for this port. | |
2490 | */ | |
2491 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *port) | |
2492 | { | |
2493 | struct uart_state *state = drv->state + port->line; | |
2494 | ||
2495 | BUG_ON(in_interrupt()); | |
2496 | ||
ebd2c8f6 | 2497 | if (state->uart_port != port) |
1da177e4 | 2498 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
ebd2c8f6 | 2499 | state->uart_port, port); |
1da177e4 | 2500 | |
f392ecfa | 2501 | mutex_lock(&port_mutex); |
1da177e4 | 2502 | |
68ac64cd RK |
2503 | /* |
2504 | * Mark the port "dead" - this prevents any opens from | |
2505 | * succeeding while we shut down the port. | |
2506 | */ | |
2507 | mutex_lock(&state->mutex); | |
2508 | port->flags |= UPF_DEAD; | |
2509 | mutex_unlock(&state->mutex); | |
2510 | ||
1da177e4 | 2511 | /* |
aa4148cf | 2512 | * Remove the devices from the tty layer |
1da177e4 LT |
2513 | */ |
2514 | tty_unregister_device(drv->tty_driver, port->line); | |
2515 | ||
ebd2c8f6 AC |
2516 | if (state->port.tty) |
2517 | tty_vhangup(state->port.tty); | |
68ac64cd | 2518 | |
68ac64cd RK |
2519 | /* |
2520 | * Free the port IO and memory resources, if any. | |
2521 | */ | |
2522 | if (port->type != PORT_UNKNOWN) | |
2523 | port->ops->release_port(port); | |
2524 | ||
2525 | /* | |
2526 | * Indicate that there isn't a port here anymore. | |
2527 | */ | |
2528 | port->type = PORT_UNKNOWN; | |
2529 | ||
2530 | /* | |
2531 | * Kill the tasklet, and free resources. | |
2532 | */ | |
ebd2c8f6 | 2533 | tasklet_kill(&state->tlet); |
68ac64cd | 2534 | |
ebd2c8f6 | 2535 | state->uart_port = NULL; |
f392ecfa | 2536 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2537 | |
2538 | return 0; | |
2539 | } | |
2540 | ||
2541 | /* | |
2542 | * Are the two ports equivalent? | |
2543 | */ | |
2544 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2545 | { | |
2546 | if (port1->iotype != port2->iotype) | |
2547 | return 0; | |
2548 | ||
2549 | switch (port1->iotype) { | |
2550 | case UPIO_PORT: | |
2551 | return (port1->iobase == port2->iobase); | |
2552 | case UPIO_HUB6: | |
2553 | return (port1->iobase == port2->iobase) && | |
2554 | (port1->hub6 == port2->hub6); | |
2555 | case UPIO_MEM: | |
d21b55d3 SS |
2556 | case UPIO_MEM32: |
2557 | case UPIO_AU: | |
2558 | case UPIO_TSI: | |
beab697a | 2559 | case UPIO_DWAPB: |
1624f003 | 2560 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2561 | } |
2562 | return 0; | |
2563 | } | |
2564 | EXPORT_SYMBOL(uart_match_port); | |
2565 | ||
1da177e4 LT |
2566 | EXPORT_SYMBOL(uart_write_wakeup); |
2567 | EXPORT_SYMBOL(uart_register_driver); | |
2568 | EXPORT_SYMBOL(uart_unregister_driver); | |
2569 | EXPORT_SYMBOL(uart_suspend_port); | |
2570 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2571 | EXPORT_SYMBOL(uart_add_one_port); |
2572 | EXPORT_SYMBOL(uart_remove_one_port); | |
2573 | ||
2574 | MODULE_DESCRIPTION("Serial driver core"); | |
2575 | MODULE_LICENSE("GPL"); |