Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Driver core for serial ports |
3 | * | |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Copyright 1999 ARM Limited | |
7 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/tty.h> | |
027d7dac | 25 | #include <linux/tty_flip.h> |
1da177e4 LT |
26 | #include <linux/slab.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/console.h> | |
d196a949 AD |
29 | #include <linux/proc_fs.h> |
30 | #include <linux/seq_file.h> | |
1da177e4 LT |
31 | #include <linux/device.h> |
32 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ | |
ccce6deb | 33 | #include <linux/serial_core.h> |
1da177e4 | 34 | #include <linux/delay.h> |
f392ecfa | 35 | #include <linux/mutex.h> |
1da177e4 LT |
36 | |
37 | #include <asm/irq.h> | |
38 | #include <asm/uaccess.h> | |
39 | ||
1da177e4 LT |
40 | /* |
41 | * This is used to lock changes in serial line configuration. | |
42 | */ | |
f392ecfa | 43 | static DEFINE_MUTEX(port_mutex); |
1da177e4 | 44 | |
13e83599 IM |
45 | /* |
46 | * lockdep: port->lock is initialized in two places, but we | |
47 | * want only one lock-class: | |
48 | */ | |
49 | static struct lock_class_key port_lock_key; | |
50 | ||
1da177e4 LT |
51 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
52 | ||
19225135 | 53 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
a46c9994 | 54 | struct ktermios *old_termios); |
1f33a51d | 55 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
6f538fe3 LW |
56 | static void uart_change_pm(struct uart_state *state, |
57 | enum uart_pm_state pm_state); | |
1da177e4 | 58 | |
b922e19d JS |
59 | static void uart_port_shutdown(struct tty_port *port); |
60 | ||
1da177e4 LT |
61 | /* |
62 | * This routine is used by the interrupt handler to schedule processing in | |
63 | * the software interrupt portion of the driver. | |
64 | */ | |
65 | void uart_write_wakeup(struct uart_port *port) | |
66 | { | |
ebd2c8f6 | 67 | struct uart_state *state = port->state; |
d5f735e5 PM |
68 | /* |
69 | * This means you called this function _after_ the port was | |
70 | * closed. No cookie for you. | |
71 | */ | |
ebd2c8f6 | 72 | BUG_ON(!state); |
6a3e492b | 73 | tty_wakeup(state->port.tty); |
1da177e4 LT |
74 | } |
75 | ||
76 | static void uart_stop(struct tty_struct *tty) | |
77 | { | |
78 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 79 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
80 | unsigned long flags; |
81 | ||
82 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 83 | port->ops->stop_tx(port); |
1da177e4 LT |
84 | spin_unlock_irqrestore(&port->lock, flags); |
85 | } | |
86 | ||
87 | static void __uart_start(struct tty_struct *tty) | |
88 | { | |
89 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 90 | struct uart_port *port = state->uart_port; |
1da177e4 | 91 | |
717f3bba | 92 | if (!tty->stopped && !tty->hw_stopped) |
b129a8cc | 93 | port->ops->start_tx(port); |
1da177e4 LT |
94 | } |
95 | ||
96 | static void uart_start(struct tty_struct *tty) | |
97 | { | |
98 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 99 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
100 | unsigned long flags; |
101 | ||
102 | spin_lock_irqsave(&port->lock, flags); | |
103 | __uart_start(tty); | |
104 | spin_unlock_irqrestore(&port->lock, flags); | |
105 | } | |
106 | ||
1da177e4 LT |
107 | static inline void |
108 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) | |
109 | { | |
110 | unsigned long flags; | |
111 | unsigned int old; | |
112 | ||
113 | spin_lock_irqsave(&port->lock, flags); | |
114 | old = port->mctrl; | |
115 | port->mctrl = (old & ~clear) | set; | |
116 | if (old != port->mctrl) | |
117 | port->ops->set_mctrl(port, port->mctrl); | |
118 | spin_unlock_irqrestore(&port->lock, flags); | |
119 | } | |
120 | ||
a46c9994 AC |
121 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
122 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) | |
1da177e4 LT |
123 | |
124 | /* | |
125 | * Startup the port. This will be called once per open. All calls | |
df4f4dd4 | 126 | * will be serialised by the per-port mutex. |
1da177e4 | 127 | */ |
c0d92be6 JS |
128 | static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, |
129 | int init_hw) | |
1da177e4 | 130 | { |
46d57a44 AC |
131 | struct uart_port *uport = state->uart_port; |
132 | struct tty_port *port = &state->port; | |
1da177e4 LT |
133 | unsigned long page; |
134 | int retval = 0; | |
135 | ||
46d57a44 | 136 | if (uport->type == PORT_UNKNOWN) |
c0d92be6 | 137 | return 1; |
1da177e4 | 138 | |
7deb39ed TP |
139 | /* |
140 | * Make sure the device is in D0 state. | |
141 | */ | |
142 | uart_change_pm(state, UART_PM_STATE_ON); | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * Initialise and allocate the transmit and temporary | |
146 | * buffer. | |
147 | */ | |
ebd2c8f6 | 148 | if (!state->xmit.buf) { |
df4f4dd4 | 149 | /* This is protected by the per port mutex */ |
1da177e4 LT |
150 | page = get_zeroed_page(GFP_KERNEL); |
151 | if (!page) | |
152 | return -ENOMEM; | |
153 | ||
ebd2c8f6 AC |
154 | state->xmit.buf = (unsigned char *) page; |
155 | uart_circ_clear(&state->xmit); | |
1da177e4 LT |
156 | } |
157 | ||
46d57a44 | 158 | retval = uport->ops->startup(uport); |
1da177e4 | 159 | if (retval == 0) { |
c7d7abff | 160 | if (uart_console(uport) && uport->cons->cflag) { |
adc8d746 | 161 | tty->termios.c_cflag = uport->cons->cflag; |
c7d7abff JS |
162 | uport->cons->cflag = 0; |
163 | } | |
164 | /* | |
165 | * Initialise the hardware port settings. | |
166 | */ | |
167 | uart_change_speed(tty, state, NULL); | |
1da177e4 | 168 | |
c7d7abff | 169 | if (init_hw) { |
1da177e4 LT |
170 | /* |
171 | * Setup the RTS and DTR signals once the | |
172 | * port is open and ready to respond. | |
173 | */ | |
adc8d746 | 174 | if (tty->termios.c_cflag & CBAUD) |
46d57a44 | 175 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 176 | } |
06aa82e4 MK |
177 | /* |
178 | * if hw support flow control without software intervention, | |
179 | * then skip the below check | |
180 | */ | |
181 | if (tty_port_cts_enabled(port) && | |
182 | !(uport->flags & UPF_HARD_FLOW)) { | |
46d57a44 AC |
183 | spin_lock_irq(&uport->lock); |
184 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) | |
19225135 | 185 | tty->hw_stopped = 1; |
46d57a44 | 186 | spin_unlock_irq(&uport->lock); |
0dd7a1ae | 187 | } |
1da177e4 LT |
188 | } |
189 | ||
0055197e JS |
190 | /* |
191 | * This is to allow setserial on this port. People may want to set | |
192 | * port/irq/type and then reconfigure the port properly if it failed | |
193 | * now. | |
194 | */ | |
1da177e4 | 195 | if (retval && capable(CAP_SYS_ADMIN)) |
c0d92be6 JS |
196 | return 1; |
197 | ||
198 | return retval; | |
199 | } | |
200 | ||
201 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, | |
202 | int init_hw) | |
203 | { | |
204 | struct tty_port *port = &state->port; | |
205 | int retval; | |
206 | ||
207 | if (port->flags & ASYNC_INITIALIZED) | |
208 | return 0; | |
209 | ||
210 | /* | |
211 | * Set the TTY IO error marker - we will only clear this | |
212 | * once we have successfully opened the port. | |
213 | */ | |
214 | set_bit(TTY_IO_ERROR, &tty->flags); | |
215 | ||
216 | retval = uart_port_startup(tty, state, init_hw); | |
217 | if (!retval) { | |
218 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
219 | clear_bit(TTY_IO_ERROR, &tty->flags); | |
220 | } else if (retval > 0) | |
1da177e4 LT |
221 | retval = 0; |
222 | ||
223 | return retval; | |
224 | } | |
225 | ||
226 | /* | |
227 | * This routine will shutdown a serial port; interrupts are disabled, and | |
228 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
229 | * uart_shutdown are serialised by the per-port semaphore. | |
230 | */ | |
19225135 | 231 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
1da177e4 | 232 | { |
ccce6deb | 233 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 234 | struct tty_port *port = &state->port; |
1da177e4 | 235 | |
1da177e4 | 236 | /* |
ee31b337 | 237 | * Set the TTY IO error marker |
1da177e4 | 238 | */ |
f751928e AC |
239 | if (tty) |
240 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 241 | |
bdc04e31 | 242 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
ee31b337 RK |
243 | /* |
244 | * Turn off DTR and RTS early. | |
245 | */ | |
adc8d746 | 246 | if (!tty || (tty->termios.c_cflag & HUPCL)) |
ccce6deb | 247 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
ee31b337 | 248 | |
b922e19d | 249 | uart_port_shutdown(port); |
ee31b337 | 250 | } |
1da177e4 LT |
251 | |
252 | /* | |
d208a3bf DA |
253 | * It's possible for shutdown to be called after suspend if we get |
254 | * a DCD drop (hangup) at just the right time. Clear suspended bit so | |
255 | * we don't try to resume a port that has been shutdown. | |
1da177e4 | 256 | */ |
d208a3bf | 257 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
258 | |
259 | /* | |
260 | * Free the transmit buffer page. | |
261 | */ | |
ebd2c8f6 AC |
262 | if (state->xmit.buf) { |
263 | free_page((unsigned long)state->xmit.buf); | |
264 | state->xmit.buf = NULL; | |
1da177e4 | 265 | } |
1da177e4 LT |
266 | } |
267 | ||
268 | /** | |
269 | * uart_update_timeout - update per-port FIFO timeout. | |
270 | * @port: uart_port structure describing the port | |
271 | * @cflag: termios cflag value | |
272 | * @baud: speed of the port | |
273 | * | |
274 | * Set the port FIFO timeout value. The @cflag value should | |
275 | * reflect the actual hardware settings. | |
276 | */ | |
277 | void | |
278 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
279 | unsigned int baud) | |
280 | { | |
281 | unsigned int bits; | |
282 | ||
283 | /* byte size and parity */ | |
284 | switch (cflag & CSIZE) { | |
285 | case CS5: | |
286 | bits = 7; | |
287 | break; | |
288 | case CS6: | |
289 | bits = 8; | |
290 | break; | |
291 | case CS7: | |
292 | bits = 9; | |
293 | break; | |
294 | default: | |
295 | bits = 10; | |
a46c9994 | 296 | break; /* CS8 */ |
1da177e4 LT |
297 | } |
298 | ||
299 | if (cflag & CSTOPB) | |
300 | bits++; | |
301 | if (cflag & PARENB) | |
302 | bits++; | |
303 | ||
304 | /* | |
305 | * The total number of bits to be transmitted in the fifo. | |
306 | */ | |
307 | bits = bits * port->fifosize; | |
308 | ||
309 | /* | |
310 | * Figure the timeout to send the above number of bits. | |
311 | * Add .02 seconds of slop | |
312 | */ | |
313 | port->timeout = (HZ * bits) / baud + HZ/50; | |
314 | } | |
315 | ||
316 | EXPORT_SYMBOL(uart_update_timeout); | |
317 | ||
318 | /** | |
319 | * uart_get_baud_rate - return baud rate for a particular port | |
320 | * @port: uart_port structure describing the port in question. | |
321 | * @termios: desired termios settings. | |
322 | * @old: old termios (or NULL) | |
323 | * @min: minimum acceptable baud rate | |
324 | * @max: maximum acceptable baud rate | |
325 | * | |
326 | * Decode the termios structure into a numeric baud rate, | |
327 | * taking account of the magic 38400 baud rate (with spd_* | |
328 | * flags), and mapping the %B0 rate to 9600 baud. | |
329 | * | |
330 | * If the new baud rate is invalid, try the old termios setting. | |
331 | * If it's still invalid, we try 9600 baud. | |
332 | * | |
333 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
334 | * we're actually going to be using. Don't do this for the case |
335 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
336 | */ |
337 | unsigned int | |
606d099c AC |
338 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
339 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
340 | { |
341 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 342 | int hung_up = 0; |
0077d45e | 343 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
344 | |
345 | if (flags == UPF_SPD_HI) | |
346 | altbaud = 57600; | |
82cb7ba1 | 347 | else if (flags == UPF_SPD_VHI) |
1da177e4 | 348 | altbaud = 115200; |
82cb7ba1 | 349 | else if (flags == UPF_SPD_SHI) |
1da177e4 | 350 | altbaud = 230400; |
82cb7ba1 | 351 | else if (flags == UPF_SPD_WARP) |
1da177e4 LT |
352 | altbaud = 460800; |
353 | ||
354 | for (try = 0; try < 2; try++) { | |
355 | baud = tty_termios_baud_rate(termios); | |
356 | ||
357 | /* | |
358 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
359 | * Die! Die! Die! | |
360 | */ | |
361 | if (baud == 38400) | |
362 | baud = altbaud; | |
363 | ||
364 | /* | |
365 | * Special case: B0 rate. | |
366 | */ | |
eb424fd2 AC |
367 | if (baud == 0) { |
368 | hung_up = 1; | |
1da177e4 | 369 | baud = 9600; |
eb424fd2 | 370 | } |
1da177e4 LT |
371 | |
372 | if (baud >= min && baud <= max) | |
373 | return baud; | |
374 | ||
375 | /* | |
376 | * Oops, the quotient was zero. Try again with | |
377 | * the old baud rate if possible. | |
378 | */ | |
379 | termios->c_cflag &= ~CBAUD; | |
380 | if (old) { | |
6d4d67be | 381 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
382 | if (!hung_up) |
383 | tty_termios_encode_baud_rate(termios, | |
384 | baud, baud); | |
1da177e4 LT |
385 | old = NULL; |
386 | continue; | |
387 | } | |
388 | ||
389 | /* | |
16ae2a87 AC |
390 | * As a last resort, if the range cannot be met then clip to |
391 | * the nearest chip supported rate. | |
1da177e4 | 392 | */ |
16ae2a87 AC |
393 | if (!hung_up) { |
394 | if (baud <= min) | |
395 | tty_termios_encode_baud_rate(termios, | |
396 | min + 1, min + 1); | |
397 | else | |
398 | tty_termios_encode_baud_rate(termios, | |
399 | max - 1, max - 1); | |
400 | } | |
1da177e4 | 401 | } |
16ae2a87 AC |
402 | /* Should never happen */ |
403 | WARN_ON(1); | |
1da177e4 LT |
404 | return 0; |
405 | } | |
406 | ||
407 | EXPORT_SYMBOL(uart_get_baud_rate); | |
408 | ||
409 | /** | |
410 | * uart_get_divisor - return uart clock divisor | |
411 | * @port: uart_port structure describing the port. | |
412 | * @baud: desired baud rate | |
413 | * | |
414 | * Calculate the uart clock divisor for the port. | |
415 | */ | |
416 | unsigned int | |
417 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
418 | { | |
419 | unsigned int quot; | |
420 | ||
421 | /* | |
422 | * Old custom speed handling. | |
423 | */ | |
424 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
425 | quot = port->custom_divisor; | |
426 | else | |
97d24634 | 427 | quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); |
1da177e4 LT |
428 | |
429 | return quot; | |
430 | } | |
431 | ||
432 | EXPORT_SYMBOL(uart_get_divisor); | |
433 | ||
23d22cea | 434 | /* FIXME: Consistent locking policy */ |
19225135 AC |
435 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
436 | struct ktermios *old_termios) | |
1da177e4 | 437 | { |
ccce6deb | 438 | struct tty_port *port = &state->port; |
ccce6deb | 439 | struct uart_port *uport = state->uart_port; |
606d099c | 440 | struct ktermios *termios; |
1da177e4 LT |
441 | |
442 | /* | |
443 | * If we have no tty, termios, or the port does not exist, | |
444 | * then we can't set the parameters for this port. | |
445 | */ | |
adc8d746 | 446 | if (!tty || uport->type == PORT_UNKNOWN) |
1da177e4 LT |
447 | return; |
448 | ||
adc8d746 | 449 | termios = &tty->termios; |
1da177e4 LT |
450 | |
451 | /* | |
452 | * Set flags based on termios cflag | |
453 | */ | |
454 | if (termios->c_cflag & CRTSCTS) | |
ccce6deb | 455 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 | 456 | else |
ccce6deb | 457 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 LT |
458 | |
459 | if (termios->c_cflag & CLOCAL) | |
ccce6deb | 460 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 461 | else |
ccce6deb | 462 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 463 | |
ccce6deb | 464 | uport->ops->set_termios(uport, termios, old_termios); |
1da177e4 LT |
465 | } |
466 | ||
19225135 AC |
467 | static inline int __uart_put_char(struct uart_port *port, |
468 | struct circ_buf *circ, unsigned char c) | |
1da177e4 LT |
469 | { |
470 | unsigned long flags; | |
23d22cea | 471 | int ret = 0; |
1da177e4 LT |
472 | |
473 | if (!circ->buf) | |
23d22cea | 474 | return 0; |
1da177e4 LT |
475 | |
476 | spin_lock_irqsave(&port->lock, flags); | |
477 | if (uart_circ_chars_free(circ) != 0) { | |
478 | circ->buf[circ->head] = c; | |
479 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 480 | ret = 1; |
1da177e4 LT |
481 | } |
482 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 483 | return ret; |
1da177e4 LT |
484 | } |
485 | ||
23d22cea | 486 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
487 | { |
488 | struct uart_state *state = tty->driver_data; | |
489 | ||
ebd2c8f6 | 490 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
1da177e4 LT |
491 | } |
492 | ||
493 | static void uart_flush_chars(struct tty_struct *tty) | |
494 | { | |
495 | uart_start(tty); | |
496 | } | |
497 | ||
19225135 AC |
498 | static int uart_write(struct tty_struct *tty, |
499 | const unsigned char *buf, int count) | |
1da177e4 LT |
500 | { |
501 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
502 | struct uart_port *port; |
503 | struct circ_buf *circ; | |
1da177e4 LT |
504 | unsigned long flags; |
505 | int c, ret = 0; | |
506 | ||
d5f735e5 PM |
507 | /* |
508 | * This means you called this function _after_ the port was | |
509 | * closed. No cookie for you. | |
510 | */ | |
f751928e | 511 | if (!state) { |
d5f735e5 PM |
512 | WARN_ON(1); |
513 | return -EL3HLT; | |
514 | } | |
515 | ||
ebd2c8f6 AC |
516 | port = state->uart_port; |
517 | circ = &state->xmit; | |
d5f735e5 | 518 | |
1da177e4 LT |
519 | if (!circ->buf) |
520 | return 0; | |
521 | ||
522 | spin_lock_irqsave(&port->lock, flags); | |
523 | while (1) { | |
524 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
525 | if (count < c) | |
526 | c = count; | |
527 | if (c <= 0) | |
528 | break; | |
529 | memcpy(circ->buf + circ->head, buf, c); | |
530 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
531 | buf += c; | |
532 | count -= c; | |
533 | ret += c; | |
534 | } | |
535 | spin_unlock_irqrestore(&port->lock, flags); | |
536 | ||
537 | uart_start(tty); | |
538 | return ret; | |
539 | } | |
540 | ||
541 | static int uart_write_room(struct tty_struct *tty) | |
542 | { | |
543 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
544 | unsigned long flags; |
545 | int ret; | |
1da177e4 | 546 | |
ebd2c8f6 AC |
547 | spin_lock_irqsave(&state->uart_port->lock, flags); |
548 | ret = uart_circ_chars_free(&state->xmit); | |
549 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 550 | return ret; |
1da177e4 LT |
551 | } |
552 | ||
553 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
554 | { | |
555 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
556 | unsigned long flags; |
557 | int ret; | |
1da177e4 | 558 | |
ebd2c8f6 AC |
559 | spin_lock_irqsave(&state->uart_port->lock, flags); |
560 | ret = uart_circ_chars_pending(&state->xmit); | |
561 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 562 | return ret; |
1da177e4 LT |
563 | } |
564 | ||
565 | static void uart_flush_buffer(struct tty_struct *tty) | |
566 | { | |
567 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 568 | struct uart_port *port; |
1da177e4 LT |
569 | unsigned long flags; |
570 | ||
d5f735e5 PM |
571 | /* |
572 | * This means you called this function _after_ the port was | |
573 | * closed. No cookie for you. | |
574 | */ | |
f751928e | 575 | if (!state) { |
d5f735e5 PM |
576 | WARN_ON(1); |
577 | return; | |
578 | } | |
579 | ||
ebd2c8f6 | 580 | port = state->uart_port; |
eb3a1e11 | 581 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
582 | |
583 | spin_lock_irqsave(&port->lock, flags); | |
ebd2c8f6 | 584 | uart_circ_clear(&state->xmit); |
6bb0e3a5 HS |
585 | if (port->ops->flush_buffer) |
586 | port->ops->flush_buffer(port); | |
1da177e4 LT |
587 | spin_unlock_irqrestore(&port->lock, flags); |
588 | tty_wakeup(tty); | |
589 | } | |
590 | ||
591 | /* | |
592 | * This function is used to send a high-priority XON/XOFF character to | |
593 | * the device | |
594 | */ | |
595 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
596 | { | |
597 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 598 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
599 | unsigned long flags; |
600 | ||
601 | if (port->ops->send_xchar) | |
602 | port->ops->send_xchar(port, ch); | |
603 | else { | |
604 | port->x_char = ch; | |
605 | if (ch) { | |
606 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 607 | port->ops->start_tx(port); |
1da177e4 LT |
608 | spin_unlock_irqrestore(&port->lock, flags); |
609 | } | |
610 | } | |
611 | } | |
612 | ||
613 | static void uart_throttle(struct tty_struct *tty) | |
614 | { | |
615 | struct uart_state *state = tty->driver_data; | |
9aba8d5b RK |
616 | struct uart_port *port = state->uart_port; |
617 | uint32_t mask = 0; | |
1da177e4 LT |
618 | |
619 | if (I_IXOFF(tty)) | |
9aba8d5b RK |
620 | mask |= UPF_SOFT_FLOW; |
621 | if (tty->termios.c_cflag & CRTSCTS) | |
622 | mask |= UPF_HARD_FLOW; | |
623 | ||
624 | if (port->flags & mask) { | |
625 | port->ops->throttle(port); | |
626 | mask &= ~port->flags; | |
627 | } | |
628 | ||
629 | if (mask & UPF_SOFT_FLOW) | |
1da177e4 LT |
630 | uart_send_xchar(tty, STOP_CHAR(tty)); |
631 | ||
9aba8d5b RK |
632 | if (mask & UPF_HARD_FLOW) |
633 | uart_clear_mctrl(port, TIOCM_RTS); | |
1da177e4 LT |
634 | } |
635 | ||
636 | static void uart_unthrottle(struct tty_struct *tty) | |
637 | { | |
638 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 639 | struct uart_port *port = state->uart_port; |
9aba8d5b | 640 | uint32_t mask = 0; |
1da177e4 | 641 | |
9aba8d5b RK |
642 | if (I_IXOFF(tty)) |
643 | mask |= UPF_SOFT_FLOW; | |
644 | if (tty->termios.c_cflag & CRTSCTS) | |
645 | mask |= UPF_HARD_FLOW; | |
646 | ||
647 | if (port->flags & mask) { | |
648 | port->ops->unthrottle(port); | |
649 | mask &= ~port->flags; | |
650 | } | |
1da177e4 | 651 | |
9aba8d5b | 652 | if (mask & UPF_SOFT_FLOW) { |
1da177e4 LT |
653 | if (port->x_char) |
654 | port->x_char = 0; | |
655 | else | |
656 | uart_send_xchar(tty, START_CHAR(tty)); | |
657 | } | |
658 | ||
9aba8d5b | 659 | if (mask & UPF_HARD_FLOW) |
1da177e4 LT |
660 | uart_set_mctrl(port, TIOCM_RTS); |
661 | } | |
662 | ||
9f109694 | 663 | static void do_uart_get_info(struct tty_port *port, |
7ba2e769 | 664 | struct serial_struct *retinfo) |
1da177e4 | 665 | { |
9f109694 | 666 | struct uart_state *state = container_of(port, struct uart_state, port); |
a2bceae0 | 667 | struct uart_port *uport = state->uart_port; |
f34d7a5b | 668 | |
37cd0c99 | 669 | memset(retinfo, 0, sizeof(*retinfo)); |
f34d7a5b | 670 | |
7ba2e769 AC |
671 | retinfo->type = uport->type; |
672 | retinfo->line = uport->line; | |
673 | retinfo->port = uport->iobase; | |
1da177e4 | 674 | if (HIGH_BITS_OFFSET) |
7ba2e769 AC |
675 | retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
676 | retinfo->irq = uport->irq; | |
677 | retinfo->flags = uport->flags; | |
678 | retinfo->xmit_fifo_size = uport->fifosize; | |
679 | retinfo->baud_base = uport->uartclk / 16; | |
680 | retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; | |
681 | retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
1da177e4 | 682 | ASYNC_CLOSING_WAIT_NONE : |
4cb0fbfd | 683 | jiffies_to_msecs(port->closing_wait) / 10; |
7ba2e769 AC |
684 | retinfo->custom_divisor = uport->custom_divisor; |
685 | retinfo->hub6 = uport->hub6; | |
686 | retinfo->io_type = uport->iotype; | |
687 | retinfo->iomem_reg_shift = uport->regshift; | |
688 | retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; | |
689 | } | |
690 | ||
9f109694 AC |
691 | static void uart_get_info(struct tty_port *port, |
692 | struct serial_struct *retinfo) | |
7ba2e769 | 693 | { |
7ba2e769 AC |
694 | /* Ensure the state we copy is consistent and no hardware changes |
695 | occur as we go */ | |
696 | mutex_lock(&port->mutex); | |
9f109694 | 697 | do_uart_get_info(port, retinfo); |
a2bceae0 | 698 | mutex_unlock(&port->mutex); |
9f109694 AC |
699 | } |
700 | ||
701 | static int uart_get_info_user(struct tty_port *port, | |
702 | struct serial_struct __user *retinfo) | |
703 | { | |
704 | struct serial_struct tmp; | |
705 | uart_get_info(port, &tmp); | |
f34d7a5b | 706 | |
1da177e4 LT |
707 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
708 | return -EFAULT; | |
709 | return 0; | |
710 | } | |
711 | ||
7ba2e769 AC |
712 | static int uart_set_info(struct tty_struct *tty, struct tty_port *port, |
713 | struct uart_state *state, | |
714 | struct serial_struct *new_info) | |
1da177e4 | 715 | { |
46d57a44 | 716 | struct uart_port *uport = state->uart_port; |
1da177e4 | 717 | unsigned long new_port; |
0077d45e | 718 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 719 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 720 | upf_t old_flags, new_flags; |
1da177e4 LT |
721 | int retval = 0; |
722 | ||
7ba2e769 | 723 | new_port = new_info->port; |
1da177e4 | 724 | if (HIGH_BITS_OFFSET) |
7ba2e769 | 725 | new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; |
1da177e4 | 726 | |
7ba2e769 AC |
727 | new_info->irq = irq_canonicalize(new_info->irq); |
728 | close_delay = msecs_to_jiffies(new_info->close_delay * 10); | |
729 | closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
4cb0fbfd | 730 | ASYNC_CLOSING_WAIT_NONE : |
7ba2e769 | 731 | msecs_to_jiffies(new_info->closing_wait * 10); |
1da177e4 | 732 | |
1da177e4 | 733 | |
46d57a44 | 734 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
7ba2e769 | 735 | && new_info->irq != uport->irq; |
1da177e4 LT |
736 | |
737 | /* | |
738 | * Since changing the 'type' of the port changes its resource | |
739 | * allocations, we should treat type changes the same as | |
740 | * IO port changes. | |
741 | */ | |
46d57a44 AC |
742 | change_port = !(uport->flags & UPF_FIXED_PORT) |
743 | && (new_port != uport->iobase || | |
7ba2e769 AC |
744 | (unsigned long)new_info->iomem_base != uport->mapbase || |
745 | new_info->hub6 != uport->hub6 || | |
746 | new_info->io_type != uport->iotype || | |
747 | new_info->iomem_reg_shift != uport->regshift || | |
748 | new_info->type != uport->type); | |
46d57a44 AC |
749 | |
750 | old_flags = uport->flags; | |
7ba2e769 | 751 | new_flags = new_info->flags; |
46d57a44 | 752 | old_custom_divisor = uport->custom_divisor; |
1da177e4 LT |
753 | |
754 | if (!capable(CAP_SYS_ADMIN)) { | |
755 | retval = -EPERM; | |
756 | if (change_irq || change_port || | |
7ba2e769 | 757 | (new_info->baud_base != uport->uartclk / 16) || |
46d57a44 AC |
758 | (close_delay != port->close_delay) || |
759 | (closing_wait != port->closing_wait) || | |
7ba2e769 AC |
760 | (new_info->xmit_fifo_size && |
761 | new_info->xmit_fifo_size != uport->fifosize) || | |
0077d45e | 762 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 | 763 | goto exit; |
46d57a44 | 764 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
0077d45e | 765 | (new_flags & UPF_USR_MASK)); |
7ba2e769 | 766 | uport->custom_divisor = new_info->custom_divisor; |
1da177e4 LT |
767 | goto check_and_exit; |
768 | } | |
769 | ||
770 | /* | |
771 | * Ask the low level driver to verify the settings. | |
772 | */ | |
46d57a44 | 773 | if (uport->ops->verify_port) |
7ba2e769 | 774 | retval = uport->ops->verify_port(uport, new_info); |
1da177e4 | 775 | |
7ba2e769 AC |
776 | if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || |
777 | (new_info->baud_base < 9600)) | |
1da177e4 LT |
778 | retval = -EINVAL; |
779 | ||
780 | if (retval) | |
781 | goto exit; | |
782 | ||
783 | if (change_port || change_irq) { | |
784 | retval = -EBUSY; | |
785 | ||
786 | /* | |
787 | * Make sure that we are the sole user of this port. | |
788 | */ | |
b58d13a0 | 789 | if (tty_port_users(port) > 1) |
1da177e4 LT |
790 | goto exit; |
791 | ||
792 | /* | |
793 | * We need to shutdown the serial port at the old | |
794 | * port/type/irq combination. | |
795 | */ | |
19225135 | 796 | uart_shutdown(tty, state); |
1da177e4 LT |
797 | } |
798 | ||
799 | if (change_port) { | |
800 | unsigned long old_iobase, old_mapbase; | |
801 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
802 | ||
46d57a44 AC |
803 | old_iobase = uport->iobase; |
804 | old_mapbase = uport->mapbase; | |
805 | old_type = uport->type; | |
806 | old_hub6 = uport->hub6; | |
807 | old_iotype = uport->iotype; | |
808 | old_shift = uport->regshift; | |
1da177e4 LT |
809 | |
810 | /* | |
811 | * Free and release old regions | |
812 | */ | |
813 | if (old_type != PORT_UNKNOWN) | |
46d57a44 | 814 | uport->ops->release_port(uport); |
1da177e4 | 815 | |
46d57a44 | 816 | uport->iobase = new_port; |
7ba2e769 AC |
817 | uport->type = new_info->type; |
818 | uport->hub6 = new_info->hub6; | |
819 | uport->iotype = new_info->io_type; | |
820 | uport->regshift = new_info->iomem_reg_shift; | |
821 | uport->mapbase = (unsigned long)new_info->iomem_base; | |
1da177e4 LT |
822 | |
823 | /* | |
824 | * Claim and map the new regions | |
825 | */ | |
46d57a44 AC |
826 | if (uport->type != PORT_UNKNOWN) { |
827 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
828 | } else { |
829 | /* Always success - Jean II */ | |
830 | retval = 0; | |
831 | } | |
832 | ||
833 | /* | |
834 | * If we fail to request resources for the | |
835 | * new port, try to restore the old settings. | |
836 | */ | |
7deb39ed | 837 | if (retval) { |
46d57a44 AC |
838 | uport->iobase = old_iobase; |
839 | uport->type = old_type; | |
840 | uport->hub6 = old_hub6; | |
841 | uport->iotype = old_iotype; | |
842 | uport->regshift = old_shift; | |
843 | uport->mapbase = old_mapbase; | |
1da177e4 | 844 | |
7deb39ed TP |
845 | if (old_type != PORT_UNKNOWN) { |
846 | retval = uport->ops->request_port(uport); | |
847 | /* | |
848 | * If we failed to restore the old settings, | |
849 | * we fail like this. | |
850 | */ | |
851 | if (retval) | |
852 | uport->type = PORT_UNKNOWN; | |
853 | ||
854 | /* | |
855 | * We failed anyway. | |
856 | */ | |
857 | retval = -EBUSY; | |
858 | } | |
859 | ||
a46c9994 AC |
860 | /* Added to return the correct error -Ram Gupta */ |
861 | goto exit; | |
1da177e4 LT |
862 | } |
863 | } | |
864 | ||
abb4a239 | 865 | if (change_irq) |
7ba2e769 | 866 | uport->irq = new_info->irq; |
46d57a44 | 867 | if (!(uport->flags & UPF_FIXED_PORT)) |
7ba2e769 | 868 | uport->uartclk = new_info->baud_base * 16; |
46d57a44 | 869 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
0077d45e | 870 | (new_flags & UPF_CHANGE_MASK); |
7ba2e769 | 871 | uport->custom_divisor = new_info->custom_divisor; |
46d57a44 AC |
872 | port->close_delay = close_delay; |
873 | port->closing_wait = closing_wait; | |
7ba2e769 AC |
874 | if (new_info->xmit_fifo_size) |
875 | uport->fifosize = new_info->xmit_fifo_size; | |
d6c53c0e | 876 | port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
877 | |
878 | check_and_exit: | |
879 | retval = 0; | |
46d57a44 | 880 | if (uport->type == PORT_UNKNOWN) |
1da177e4 | 881 | goto exit; |
ccce6deb | 882 | if (port->flags & ASYNC_INITIALIZED) { |
46d57a44 AC |
883 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
884 | old_custom_divisor != uport->custom_divisor) { | |
1da177e4 LT |
885 | /* |
886 | * If they're setting up a custom divisor or speed, | |
887 | * instead of clearing it, then bitch about it. No | |
888 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
889 | */ | |
46d57a44 | 890 | if (uport->flags & UPF_SPD_MASK) { |
1da177e4 LT |
891 | char buf[64]; |
892 | printk(KERN_NOTICE | |
893 | "%s sets custom speed on %s. This " | |
894 | "is deprecated.\n", current->comm, | |
46d57a44 | 895 | tty_name(port->tty, buf)); |
1da177e4 | 896 | } |
19225135 | 897 | uart_change_speed(tty, state, NULL); |
1da177e4 LT |
898 | } |
899 | } else | |
19225135 | 900 | retval = uart_startup(tty, state, 1); |
1da177e4 | 901 | exit: |
7ba2e769 AC |
902 | return retval; |
903 | } | |
904 | ||
905 | static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, | |
906 | struct serial_struct __user *newinfo) | |
907 | { | |
908 | struct serial_struct new_serial; | |
909 | struct tty_port *port = &state->port; | |
910 | int retval; | |
911 | ||
912 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
913 | return -EFAULT; | |
914 | ||
915 | /* | |
916 | * This semaphore protects port->count. It is also | |
917 | * very useful to prevent opens. Also, take the | |
918 | * port configuration semaphore to make sure that a | |
919 | * module insertion/removal doesn't change anything | |
920 | * under us. | |
921 | */ | |
922 | mutex_lock(&port->mutex); | |
923 | retval = uart_set_info(tty, port, state, &new_serial); | |
a2bceae0 | 924 | mutex_unlock(&port->mutex); |
1da177e4 LT |
925 | return retval; |
926 | } | |
927 | ||
19225135 AC |
928 | /** |
929 | * uart_get_lsr_info - get line status register info | |
930 | * @tty: tty associated with the UART | |
931 | * @state: UART being queried | |
932 | * @value: returned modem value | |
933 | * | |
934 | * Note: uart_ioctl protects us against hangups. | |
1da177e4 | 935 | */ |
19225135 AC |
936 | static int uart_get_lsr_info(struct tty_struct *tty, |
937 | struct uart_state *state, unsigned int __user *value) | |
1da177e4 | 938 | { |
46d57a44 | 939 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
940 | unsigned int result; |
941 | ||
46d57a44 | 942 | result = uport->ops->tx_empty(uport); |
1da177e4 LT |
943 | |
944 | /* | |
945 | * If we're about to load something into the transmit | |
946 | * register, we'll pretend the transmitter isn't empty to | |
947 | * avoid a race condition (depending on when the transmit | |
948 | * interrupt happens). | |
949 | */ | |
46d57a44 | 950 | if (uport->x_char || |
ebd2c8f6 | 951 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
19225135 | 952 | !tty->stopped && !tty->hw_stopped)) |
1da177e4 | 953 | result &= ~TIOCSER_TEMT; |
a46c9994 | 954 | |
1da177e4 LT |
955 | return put_user(result, value); |
956 | } | |
957 | ||
60b33c13 | 958 | static int uart_tiocmget(struct tty_struct *tty) |
1da177e4 LT |
959 | { |
960 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 961 | struct tty_port *port = &state->port; |
46d57a44 | 962 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
963 | int result = -EIO; |
964 | ||
a2bceae0 | 965 | mutex_lock(&port->mutex); |
60b33c13 | 966 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 967 | result = uport->mctrl; |
46d57a44 AC |
968 | spin_lock_irq(&uport->lock); |
969 | result |= uport->ops->get_mctrl(uport); | |
970 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 971 | } |
a2bceae0 | 972 | mutex_unlock(&port->mutex); |
1da177e4 LT |
973 | |
974 | return result; | |
975 | } | |
976 | ||
977 | static int | |
20b9d177 | 978 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
1da177e4 LT |
979 | { |
980 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 981 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 982 | struct tty_port *port = &state->port; |
1da177e4 LT |
983 | int ret = -EIO; |
984 | ||
a2bceae0 | 985 | mutex_lock(&port->mutex); |
20b9d177 | 986 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 987 | uart_update_mctrl(uport, set, clear); |
1da177e4 LT |
988 | ret = 0; |
989 | } | |
a2bceae0 | 990 | mutex_unlock(&port->mutex); |
1da177e4 LT |
991 | return ret; |
992 | } | |
993 | ||
9e98966c | 994 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
995 | { |
996 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 997 | struct tty_port *port = &state->port; |
46d57a44 | 998 | struct uart_port *uport = state->uart_port; |
1da177e4 | 999 | |
a2bceae0 | 1000 | mutex_lock(&port->mutex); |
1da177e4 | 1001 | |
46d57a44 AC |
1002 | if (uport->type != PORT_UNKNOWN) |
1003 | uport->ops->break_ctl(uport, break_state); | |
1da177e4 | 1004 | |
a2bceae0 | 1005 | mutex_unlock(&port->mutex); |
9e98966c | 1006 | return 0; |
1da177e4 LT |
1007 | } |
1008 | ||
19225135 | 1009 | static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) |
1da177e4 | 1010 | { |
46d57a44 | 1011 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 1012 | struct tty_port *port = &state->port; |
1da177e4 LT |
1013 | int flags, ret; |
1014 | ||
1015 | if (!capable(CAP_SYS_ADMIN)) | |
1016 | return -EPERM; | |
1017 | ||
1018 | /* | |
1019 | * Take the per-port semaphore. This prevents count from | |
1020 | * changing, and hence any extra opens of the port while | |
1021 | * we're auto-configuring. | |
1022 | */ | |
a2bceae0 | 1023 | if (mutex_lock_interruptible(&port->mutex)) |
1da177e4 LT |
1024 | return -ERESTARTSYS; |
1025 | ||
1026 | ret = -EBUSY; | |
b58d13a0 | 1027 | if (tty_port_users(port) == 1) { |
19225135 | 1028 | uart_shutdown(tty, state); |
1da177e4 LT |
1029 | |
1030 | /* | |
1031 | * If we already have a port type configured, | |
1032 | * we must release its resources. | |
1033 | */ | |
46d57a44 AC |
1034 | if (uport->type != PORT_UNKNOWN) |
1035 | uport->ops->release_port(uport); | |
1da177e4 LT |
1036 | |
1037 | flags = UART_CONFIG_TYPE; | |
46d57a44 | 1038 | if (uport->flags & UPF_AUTO_IRQ) |
1da177e4 LT |
1039 | flags |= UART_CONFIG_IRQ; |
1040 | ||
1041 | /* | |
1042 | * This will claim the ports resources if | |
1043 | * a port is found. | |
1044 | */ | |
46d57a44 | 1045 | uport->ops->config_port(uport, flags); |
1da177e4 | 1046 | |
19225135 | 1047 | ret = uart_startup(tty, state, 1); |
1da177e4 | 1048 | } |
a2bceae0 | 1049 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1050 | return ret; |
1051 | } | |
1052 | ||
1fdc3106 AS |
1053 | static void uart_enable_ms(struct uart_port *uport) |
1054 | { | |
1055 | /* | |
1056 | * Force modem status interrupts on | |
1057 | */ | |
1058 | if (uport->ops->enable_ms) | |
1059 | uport->ops->enable_ms(uport); | |
1060 | } | |
1061 | ||
1da177e4 LT |
1062 | /* |
1063 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1064 | * - mask passed in arg for lines of interest | |
1065 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1066 | * Caller should use TIOCGICOUNT to see which one it was | |
bdc04e31 AC |
1067 | * |
1068 | * FIXME: This wants extracting into a common all driver implementation | |
1069 | * of TIOCMWAIT using tty_port. | |
1da177e4 LT |
1070 | */ |
1071 | static int | |
1072 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
1073 | { | |
46d57a44 | 1074 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 1075 | struct tty_port *port = &state->port; |
1da177e4 LT |
1076 | DECLARE_WAITQUEUE(wait, current); |
1077 | struct uart_icount cprev, cnow; | |
1078 | int ret; | |
1079 | ||
1080 | /* | |
1081 | * note the counters on entry | |
1082 | */ | |
46d57a44 AC |
1083 | spin_lock_irq(&uport->lock); |
1084 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); | |
1fdc3106 | 1085 | uart_enable_ms(uport); |
46d57a44 | 1086 | spin_unlock_irq(&uport->lock); |
1da177e4 | 1087 | |
bdc04e31 | 1088 | add_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 | 1089 | for (;;) { |
46d57a44 AC |
1090 | spin_lock_irq(&uport->lock); |
1091 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1092 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1093 | |
1094 | set_current_state(TASK_INTERRUPTIBLE); | |
1095 | ||
1096 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1097 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1098 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1099 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1100 | ret = 0; |
1101 | break; | |
1da177e4 LT |
1102 | } |
1103 | ||
1104 | schedule(); | |
1105 | ||
1106 | /* see if a signal did it */ | |
1107 | if (signal_pending(current)) { | |
1108 | ret = -ERESTARTSYS; | |
1109 | break; | |
1110 | } | |
1111 | ||
1112 | cprev = cnow; | |
1113 | } | |
1114 | ||
1115 | current->state = TASK_RUNNING; | |
bdc04e31 | 1116 | remove_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 LT |
1117 | |
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1123 | * Return: write counters to the user passed counter struct | |
1124 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1125 | * RI where only 0->1 is counted. | |
1126 | */ | |
d281da7f AC |
1127 | static int uart_get_icount(struct tty_struct *tty, |
1128 | struct serial_icounter_struct *icount) | |
1da177e4 | 1129 | { |
d281da7f | 1130 | struct uart_state *state = tty->driver_data; |
1da177e4 | 1131 | struct uart_icount cnow; |
46d57a44 | 1132 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1133 | |
46d57a44 AC |
1134 | spin_lock_irq(&uport->lock); |
1135 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1136 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1137 | |
d281da7f AC |
1138 | icount->cts = cnow.cts; |
1139 | icount->dsr = cnow.dsr; | |
1140 | icount->rng = cnow.rng; | |
1141 | icount->dcd = cnow.dcd; | |
1142 | icount->rx = cnow.rx; | |
1143 | icount->tx = cnow.tx; | |
1144 | icount->frame = cnow.frame; | |
1145 | icount->overrun = cnow.overrun; | |
1146 | icount->parity = cnow.parity; | |
1147 | icount->brk = cnow.brk; | |
1148 | icount->buf_overrun = cnow.buf_overrun; | |
1149 | ||
1150 | return 0; | |
1da177e4 LT |
1151 | } |
1152 | ||
1153 | /* | |
e5238442 | 1154 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1155 | */ |
1156 | static int | |
6caa76b7 | 1157 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, |
1da177e4 LT |
1158 | unsigned long arg) |
1159 | { | |
1160 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1161 | struct tty_port *port = &state->port; |
1da177e4 LT |
1162 | void __user *uarg = (void __user *)arg; |
1163 | int ret = -ENOIOCTLCMD; | |
1164 | ||
1da177e4 LT |
1165 | |
1166 | /* | |
1167 | * These ioctls don't rely on the hardware to be present. | |
1168 | */ | |
1169 | switch (cmd) { | |
1170 | case TIOCGSERIAL: | |
9f109694 | 1171 | ret = uart_get_info_user(port, uarg); |
1da177e4 LT |
1172 | break; |
1173 | ||
1174 | case TIOCSSERIAL: | |
7ba2e769 | 1175 | ret = uart_set_info_user(tty, state, uarg); |
1da177e4 LT |
1176 | break; |
1177 | ||
1178 | case TIOCSERCONFIG: | |
19225135 | 1179 | ret = uart_do_autoconfig(tty, state); |
1da177e4 LT |
1180 | break; |
1181 | ||
1182 | case TIOCSERGWILD: /* obsolete */ | |
1183 | case TIOCSERSWILD: /* obsolete */ | |
1184 | ret = 0; | |
1185 | break; | |
1186 | } | |
1187 | ||
1188 | if (ret != -ENOIOCTLCMD) | |
1189 | goto out; | |
1190 | ||
1191 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1192 | ret = -EIO; | |
1193 | goto out; | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * The following should only be used when hardware is present. | |
1198 | */ | |
1199 | switch (cmd) { | |
1200 | case TIOCMIWAIT: | |
1201 | ret = uart_wait_modem_status(state, arg); | |
1202 | break; | |
1da177e4 LT |
1203 | } |
1204 | ||
1205 | if (ret != -ENOIOCTLCMD) | |
1206 | goto out; | |
1207 | ||
a2bceae0 | 1208 | mutex_lock(&port->mutex); |
1da177e4 | 1209 | |
6caa76b7 | 1210 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
1da177e4 LT |
1211 | ret = -EIO; |
1212 | goto out_up; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * All these rely on hardware being present and need to be | |
1217 | * protected against the tty being hung up. | |
1218 | */ | |
1219 | switch (cmd) { | |
1220 | case TIOCSERGETLSR: /* Get line status register */ | |
19225135 | 1221 | ret = uart_get_lsr_info(tty, state, uarg); |
1da177e4 LT |
1222 | break; |
1223 | ||
1224 | default: { | |
46d57a44 AC |
1225 | struct uart_port *uport = state->uart_port; |
1226 | if (uport->ops->ioctl) | |
1227 | ret = uport->ops->ioctl(uport, cmd, arg); | |
1da177e4 LT |
1228 | break; |
1229 | } | |
1230 | } | |
f34d7a5b | 1231 | out_up: |
a2bceae0 | 1232 | mutex_unlock(&port->mutex); |
f34d7a5b | 1233 | out: |
1da177e4 LT |
1234 | return ret; |
1235 | } | |
1236 | ||
edeb280e | 1237 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1238 | { |
1239 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1240 | struct uart_port *uport = state->uart_port; |
64e9159f | 1241 | |
46d57a44 | 1242 | if (uport->ops->set_ldisc) |
adc8d746 | 1243 | uport->ops->set_ldisc(uport, tty->termios.c_line); |
64e9159f AC |
1244 | } |
1245 | ||
a46c9994 AC |
1246 | static void uart_set_termios(struct tty_struct *tty, |
1247 | struct ktermios *old_termios) | |
1da177e4 LT |
1248 | { |
1249 | struct uart_state *state = tty->driver_data; | |
dec94e70 | 1250 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1251 | unsigned long flags; |
adc8d746 | 1252 | unsigned int cflag = tty->termios.c_cflag; |
2cbacafd RK |
1253 | unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; |
1254 | bool sw_changed = false; | |
1da177e4 | 1255 | |
2cbacafd RK |
1256 | /* |
1257 | * Drivers doing software flow control also need to know | |
1258 | * about changes to these input settings. | |
1259 | */ | |
1260 | if (uport->flags & UPF_SOFT_FLOW) { | |
1261 | iflag_mask |= IXANY|IXON|IXOFF; | |
1262 | sw_changed = | |
1263 | tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || | |
1264 | tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; | |
1265 | } | |
1da177e4 LT |
1266 | |
1267 | /* | |
1268 | * These are the bits that are used to setup various | |
20620d68 DW |
1269 | * flags in the low level driver. We can ignore the Bfoo |
1270 | * bits in c_cflag; c_[io]speed will always be set | |
1271 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 | 1272 | */ |
1da177e4 | 1273 | if ((cflag ^ old_termios->c_cflag) == 0 && |
adc8d746 AC |
1274 | tty->termios.c_ospeed == old_termios->c_ospeed && |
1275 | tty->termios.c_ispeed == old_termios->c_ispeed && | |
2cbacafd RK |
1276 | ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && |
1277 | !sw_changed) { | |
1da177e4 | 1278 | return; |
e5238442 | 1279 | } |
1da177e4 | 1280 | |
19225135 | 1281 | uart_change_speed(tty, state, old_termios); |
1da177e4 LT |
1282 | |
1283 | /* Handle transition to B0 status */ | |
1284 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
dec94e70 | 1285 | uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 1286 | /* Handle transition away from B0 status */ |
82cb7ba1 | 1287 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 LT |
1288 | unsigned int mask = TIOCM_DTR; |
1289 | if (!(cflag & CRTSCTS) || | |
1290 | !test_bit(TTY_THROTTLED, &tty->flags)) | |
1291 | mask |= TIOCM_RTS; | |
dec94e70 | 1292 | uart_set_mctrl(uport, mask); |
1da177e4 LT |
1293 | } |
1294 | ||
dba05832 RK |
1295 | /* |
1296 | * If the port is doing h/w assisted flow control, do nothing. | |
1297 | * We assume that tty->hw_stopped has never been set. | |
1298 | */ | |
1299 | if (uport->flags & UPF_HARD_FLOW) | |
1300 | return; | |
1301 | ||
1da177e4 LT |
1302 | /* Handle turning off CRTSCTS */ |
1303 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
dec94e70 | 1304 | spin_lock_irqsave(&uport->lock, flags); |
1da177e4 LT |
1305 | tty->hw_stopped = 0; |
1306 | __uart_start(tty); | |
dec94e70 | 1307 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 | 1308 | } |
0dd7a1ae | 1309 | /* Handle turning on CRTSCTS */ |
82cb7ba1 | 1310 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
dec94e70 RK |
1311 | spin_lock_irqsave(&uport->lock, flags); |
1312 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { | |
0dd7a1ae | 1313 | tty->hw_stopped = 1; |
dec94e70 | 1314 | uport->ops->stop_tx(uport); |
0dd7a1ae | 1315 | } |
dec94e70 | 1316 | spin_unlock_irqrestore(&uport->lock, flags); |
0dd7a1ae | 1317 | } |
1da177e4 LT |
1318 | } |
1319 | ||
1320 | /* | |
ef4f527c KC |
1321 | * Calls to uart_close() are serialised via the tty_lock in |
1322 | * drivers/tty/tty_io.c:tty_release() | |
1323 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1324 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1325 | */ |
1326 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1327 | { | |
1328 | struct uart_state *state = tty->driver_data; | |
46d57a44 AC |
1329 | struct tty_port *port; |
1330 | struct uart_port *uport; | |
61cd8a21 | 1331 | unsigned long flags; |
a46c9994 | 1332 | |
eea7e17e LT |
1333 | if (!state) |
1334 | return; | |
1335 | ||
46d57a44 AC |
1336 | uport = state->uart_port; |
1337 | port = &state->port; | |
1da177e4 | 1338 | |
4ed94cd4 | 1339 | pr_debug("uart_close(%d) called\n", uport ? uport->line : -1); |
1da177e4 | 1340 | |
4ed94cd4 | 1341 | if (!port->count || tty_port_close_start(port, tty, filp) == 0) |
55956216 | 1342 | return; |
1da177e4 LT |
1343 | |
1344 | /* | |
1345 | * At this point, we stop accepting input. To do this, we | |
1346 | * disable the receive line status interrupts. | |
1347 | */ | |
ccce6deb | 1348 | if (port->flags & ASYNC_INITIALIZED) { |
1da177e4 | 1349 | unsigned long flags; |
eea7e17e | 1350 | spin_lock_irqsave(&uport->lock, flags); |
46d57a44 | 1351 | uport->ops->stop_rx(uport); |
eea7e17e | 1352 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 LT |
1353 | /* |
1354 | * Before we drop DTR, make sure the UART transmitter | |
1355 | * has completely drained; this is especially | |
1356 | * important if there is a transmit FIFO! | |
1357 | */ | |
1f33a51d | 1358 | uart_wait_until_sent(tty, uport->timeout); |
1da177e4 LT |
1359 | } |
1360 | ||
bafb0bd2 | 1361 | mutex_lock(&port->mutex); |
19225135 | 1362 | uart_shutdown(tty, state); |
1da177e4 LT |
1363 | uart_flush_buffer(tty); |
1364 | ||
a46c9994 AC |
1365 | tty_ldisc_flush(tty); |
1366 | ||
7b01478f | 1367 | tty_port_tty_set(port, NULL); |
61cd8a21 AC |
1368 | spin_lock_irqsave(&port->lock, flags); |
1369 | tty->closing = 0; | |
1da177e4 | 1370 | |
46d57a44 | 1371 | if (port->blocked_open) { |
61cd8a21 | 1372 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1373 | if (port->close_delay) |
4cb0fbfd JS |
1374 | msleep_interruptible( |
1375 | jiffies_to_msecs(port->close_delay)); | |
61cd8a21 | 1376 | spin_lock_irqsave(&port->lock, flags); |
46d57a44 | 1377 | } else if (!uart_console(uport)) { |
61cd8a21 | 1378 | spin_unlock_irqrestore(&port->lock, flags); |
6f538fe3 | 1379 | uart_change_pm(state, UART_PM_STATE_OFF); |
61cd8a21 | 1380 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1381 | } |
1382 | ||
1383 | /* | |
1384 | * Wake up anyone trying to open this port. | |
1385 | */ | |
ccce6deb | 1386 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
426929f8 | 1387 | clear_bit(ASYNCB_CLOSING, &port->flags); |
61cd8a21 | 1388 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1389 | wake_up_interruptible(&port->open_wait); |
426929f8 | 1390 | wake_up_interruptible(&port->close_wait); |
1da177e4 | 1391 | |
a2bceae0 | 1392 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1393 | } |
1394 | ||
1f33a51d | 1395 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
1da177e4 | 1396 | { |
1f33a51d JS |
1397 | struct uart_state *state = tty->driver_data; |
1398 | struct uart_port *port = state->uart_port; | |
1da177e4 LT |
1399 | unsigned long char_time, expire; |
1400 | ||
1da177e4 LT |
1401 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1402 | return; | |
1403 | ||
1404 | /* | |
1405 | * Set the check interval to be 1/5 of the estimated time to | |
1406 | * send a single character, and make it at least 1. The check | |
1407 | * interval should also be less than the timeout. | |
1408 | * | |
1409 | * Note: we have to use pretty tight timings here to satisfy | |
1410 | * the NIST-PCTS. | |
1411 | */ | |
1412 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1413 | char_time = char_time / 5; | |
1414 | if (char_time == 0) | |
1415 | char_time = 1; | |
1416 | if (timeout && timeout < char_time) | |
1417 | char_time = timeout; | |
1418 | ||
1419 | /* | |
1420 | * If the transmitter hasn't cleared in twice the approximate | |
1421 | * amount of time to send the entire FIFO, it probably won't | |
1422 | * ever clear. This assumes the UART isn't doing flow | |
1423 | * control, which is currently the case. Hence, if it ever | |
1424 | * takes longer than port->timeout, this is probably due to a | |
1425 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1426 | * 2*port->timeout. | |
1427 | */ | |
1428 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1429 | timeout = 2 * port->timeout; | |
1430 | ||
1431 | expire = jiffies + timeout; | |
1432 | ||
eb3a1e11 | 1433 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1434 | port->line, jiffies, expire); |
1da177e4 LT |
1435 | |
1436 | /* | |
1437 | * Check whether the transmitter is empty every 'char_time'. | |
1438 | * 'timeout' / 'expire' give us the maximum amount of time | |
1439 | * we wait. | |
1440 | */ | |
1441 | while (!port->ops->tx_empty(port)) { | |
1442 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1443 | if (signal_pending(current)) | |
1444 | break; | |
1445 | if (time_after(jiffies, expire)) | |
1446 | break; | |
1447 | } | |
20365219 AB |
1448 | } |
1449 | ||
1da177e4 | 1450 | /* |
ef4f527c KC |
1451 | * Calls to uart_hangup() are serialised by the tty_lock in |
1452 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1453 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1454 | */ |
1455 | static void uart_hangup(struct tty_struct *tty) | |
1456 | { | |
1457 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1458 | struct tty_port *port = &state->port; |
61cd8a21 | 1459 | unsigned long flags; |
1da177e4 | 1460 | |
ebd2c8f6 | 1461 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
1da177e4 | 1462 | |
a2bceae0 | 1463 | mutex_lock(&port->mutex); |
ccce6deb | 1464 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
1da177e4 | 1465 | uart_flush_buffer(tty); |
19225135 | 1466 | uart_shutdown(tty, state); |
61cd8a21 | 1467 | spin_lock_irqsave(&port->lock, flags); |
91312cdb | 1468 | port->count = 0; |
ccce6deb | 1469 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
61cd8a21 | 1470 | spin_unlock_irqrestore(&port->lock, flags); |
7b01478f | 1471 | tty_port_tty_set(port, NULL); |
bf903c0c GU |
1472 | if (!uart_console(state->uart_port)) |
1473 | uart_change_pm(state, UART_PM_STATE_OFF); | |
46d57a44 | 1474 | wake_up_interruptible(&port->open_wait); |
bdc04e31 | 1475 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 | 1476 | } |
a2bceae0 | 1477 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1478 | } |
1479 | ||
0b1db830 JS |
1480 | static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) |
1481 | { | |
1482 | return 0; | |
1483 | } | |
1484 | ||
1485 | static void uart_port_shutdown(struct tty_port *port) | |
1486 | { | |
b922e19d JS |
1487 | struct uart_state *state = container_of(port, struct uart_state, port); |
1488 | struct uart_port *uport = state->uart_port; | |
1489 | ||
1490 | /* | |
1491 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
1492 | * the irq here so the queue might never be woken up. Note | |
1493 | * that we won't end up waiting on delta_msr_wait again since | |
1494 | * any outstanding file descriptors should be pointing at | |
1495 | * hung_up_tty_fops now. | |
1496 | */ | |
1497 | wake_up_interruptible(&port->delta_msr_wait); | |
1498 | ||
1499 | /* | |
1500 | * Free the IRQ and disable the port. | |
1501 | */ | |
1502 | uport->ops->shutdown(uport); | |
1503 | ||
1504 | /* | |
1505 | * Ensure that the IRQ handler isn't running on another CPU. | |
1506 | */ | |
1507 | synchronize_irq(uport->irq); | |
0b1db830 JS |
1508 | } |
1509 | ||
de0c8cb3 AC |
1510 | static int uart_carrier_raised(struct tty_port *port) |
1511 | { | |
1512 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1513 | struct uart_port *uport = state->uart_port; | |
1514 | int mctrl; | |
de0c8cb3 | 1515 | spin_lock_irq(&uport->lock); |
1fdc3106 | 1516 | uart_enable_ms(uport); |
de0c8cb3 AC |
1517 | mctrl = uport->ops->get_mctrl(uport); |
1518 | spin_unlock_irq(&uport->lock); | |
de0c8cb3 AC |
1519 | if (mctrl & TIOCM_CAR) |
1520 | return 1; | |
1521 | return 0; | |
1522 | } | |
1523 | ||
1524 | static void uart_dtr_rts(struct tty_port *port, int onoff) | |
1525 | { | |
1526 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1527 | struct uart_port *uport = state->uart_port; | |
24fcc7c8 | 1528 | |
6f5c24ad | 1529 | if (onoff) |
de0c8cb3 AC |
1530 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
1531 | else | |
1532 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); | |
de0c8cb3 AC |
1533 | } |
1534 | ||
1da177e4 | 1535 | /* |
ef4f527c KC |
1536 | * Calls to uart_open are serialised by the tty_lock in |
1537 | * drivers/tty/tty_io.c:tty_open() | |
1da177e4 LT |
1538 | * Note that if this fails, then uart_close() _will_ be called. |
1539 | * | |
1540 | * In time, we want to scrap the "opening nonpresent ports" | |
1541 | * behaviour and implement an alternative way for setserial | |
1542 | * to set base addresses/ports/types. This will allow us to | |
1543 | * get rid of a certain amount of extra tests. | |
1544 | */ | |
1545 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1546 | { | |
1547 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1da177e4 | 1548 | int retval, line = tty->index; |
1c7b13c4 JS |
1549 | struct uart_state *state = drv->state + line; |
1550 | struct tty_port *port = &state->port; | |
1da177e4 | 1551 | |
eb3a1e11 | 1552 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 | 1553 | |
1da177e4 | 1554 | /* |
1c7b13c4 JS |
1555 | * We take the semaphore here to guarantee that we won't be re-entered |
1556 | * while allocating the state structure, or while we request any IRQs | |
1557 | * that the driver may need. This also has the nice side-effect that | |
1558 | * it delays the action of uart_hangup, so we can guarantee that | |
1559 | * state->port.tty will always contain something reasonable. | |
1da177e4 | 1560 | */ |
1c7b13c4 JS |
1561 | if (mutex_lock_interruptible(&port->mutex)) { |
1562 | retval = -ERESTARTSYS; | |
1563 | goto end; | |
1564 | } | |
1565 | ||
1566 | port->count++; | |
1567 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { | |
1568 | retval = -ENXIO; | |
1569 | goto err_dec_count; | |
1da177e4 LT |
1570 | } |
1571 | ||
1572 | /* | |
1573 | * Once we set tty->driver_data here, we are guaranteed that | |
1574 | * uart_close() will decrement the driver module use count. | |
1575 | * Any failures from here onwards should not touch the count. | |
1576 | */ | |
1577 | tty->driver_data = state; | |
ebd2c8f6 | 1578 | state->uart_port->state = state; |
d6c53c0e JS |
1579 | state->port.low_latency = |
1580 | (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
7b01478f | 1581 | tty_port_tty_set(port, tty); |
1da177e4 LT |
1582 | |
1583 | /* | |
1584 | * If the port is in the middle of closing, bail out now. | |
1585 | */ | |
1586 | if (tty_hung_up_p(filp)) { | |
1587 | retval = -EAGAIN; | |
1c7b13c4 | 1588 | goto err_dec_count; |
1da177e4 LT |
1589 | } |
1590 | ||
1da177e4 LT |
1591 | /* |
1592 | * Start up the serial port. | |
1593 | */ | |
19225135 | 1594 | retval = uart_startup(tty, state, 0); |
1da177e4 LT |
1595 | |
1596 | /* | |
1597 | * If we succeeded, wait until the port is ready. | |
1598 | */ | |
61cd8a21 | 1599 | mutex_unlock(&port->mutex); |
1da177e4 | 1600 | if (retval == 0) |
74c21077 | 1601 | retval = tty_port_block_til_ready(port, tty, filp); |
1da177e4 | 1602 | |
1c7b13c4 | 1603 | end: |
1da177e4 | 1604 | return retval; |
1c7b13c4 JS |
1605 | err_dec_count: |
1606 | port->count--; | |
1607 | mutex_unlock(&port->mutex); | |
1608 | goto end; | |
1da177e4 LT |
1609 | } |
1610 | ||
1611 | static const char *uart_type(struct uart_port *port) | |
1612 | { | |
1613 | const char *str = NULL; | |
1614 | ||
1615 | if (port->ops->type) | |
1616 | str = port->ops->type(port); | |
1617 | ||
1618 | if (!str) | |
1619 | str = "unknown"; | |
1620 | ||
1621 | return str; | |
1622 | } | |
1623 | ||
1624 | #ifdef CONFIG_PROC_FS | |
1625 | ||
d196a949 | 1626 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1da177e4 LT |
1627 | { |
1628 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 1629 | struct tty_port *port = &state->port; |
6f538fe3 | 1630 | enum uart_pm_state pm_state; |
a2bceae0 | 1631 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
1632 | char stat_buf[32]; |
1633 | unsigned int status; | |
d196a949 | 1634 | int mmio; |
1da177e4 | 1635 | |
a2bceae0 | 1636 | if (!uport) |
d196a949 | 1637 | return; |
1da177e4 | 1638 | |
a2bceae0 | 1639 | mmio = uport->iotype >= UPIO_MEM; |
d196a949 | 1640 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
a2bceae0 | 1641 | uport->line, uart_type(uport), |
6c6a2334 | 1642 | mmio ? "mmio:0x" : "port:", |
a2bceae0 AC |
1643 | mmio ? (unsigned long long)uport->mapbase |
1644 | : (unsigned long long)uport->iobase, | |
1645 | uport->irq); | |
1da177e4 | 1646 | |
a2bceae0 | 1647 | if (uport->type == PORT_UNKNOWN) { |
d196a949 AD |
1648 | seq_putc(m, '\n'); |
1649 | return; | |
1da177e4 LT |
1650 | } |
1651 | ||
a46c9994 | 1652 | if (capable(CAP_SYS_ADMIN)) { |
a2bceae0 | 1653 | mutex_lock(&port->mutex); |
3689a0ec | 1654 | pm_state = state->pm_state; |
6f538fe3 LW |
1655 | if (pm_state != UART_PM_STATE_ON) |
1656 | uart_change_pm(state, UART_PM_STATE_ON); | |
a2bceae0 AC |
1657 | spin_lock_irq(&uport->lock); |
1658 | status = uport->ops->get_mctrl(uport); | |
1659 | spin_unlock_irq(&uport->lock); | |
6f538fe3 | 1660 | if (pm_state != UART_PM_STATE_ON) |
3689a0ec | 1661 | uart_change_pm(state, pm_state); |
a2bceae0 | 1662 | mutex_unlock(&port->mutex); |
1da177e4 | 1663 | |
d196a949 | 1664 | seq_printf(m, " tx:%d rx:%d", |
a2bceae0 AC |
1665 | uport->icount.tx, uport->icount.rx); |
1666 | if (uport->icount.frame) | |
d196a949 | 1667 | seq_printf(m, " fe:%d", |
a2bceae0 AC |
1668 | uport->icount.frame); |
1669 | if (uport->icount.parity) | |
d196a949 | 1670 | seq_printf(m, " pe:%d", |
a2bceae0 AC |
1671 | uport->icount.parity); |
1672 | if (uport->icount.brk) | |
d196a949 | 1673 | seq_printf(m, " brk:%d", |
a2bceae0 AC |
1674 | uport->icount.brk); |
1675 | if (uport->icount.overrun) | |
d196a949 | 1676 | seq_printf(m, " oe:%d", |
a2bceae0 | 1677 | uport->icount.overrun); |
a46c9994 AC |
1678 | |
1679 | #define INFOBIT(bit, str) \ | |
a2bceae0 | 1680 | if (uport->mctrl & (bit)) \ |
1da177e4 LT |
1681 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1682 | strlen(stat_buf) - 2) | |
a46c9994 | 1683 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1684 | if (status & (bit)) \ |
1685 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1686 | strlen(stat_buf) - 2) | |
1687 | ||
1688 | stat_buf[0] = '\0'; | |
1689 | stat_buf[1] = '\0'; | |
1690 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1691 | STATBIT(TIOCM_CTS, "|CTS"); | |
1692 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1693 | STATBIT(TIOCM_DSR, "|DSR"); | |
1694 | STATBIT(TIOCM_CAR, "|CD"); | |
1695 | STATBIT(TIOCM_RNG, "|RI"); | |
1696 | if (stat_buf[0]) | |
1697 | stat_buf[0] = ' '; | |
a46c9994 | 1698 | |
d196a949 | 1699 | seq_puts(m, stat_buf); |
1da177e4 | 1700 | } |
d196a949 | 1701 | seq_putc(m, '\n'); |
1da177e4 LT |
1702 | #undef STATBIT |
1703 | #undef INFOBIT | |
1da177e4 LT |
1704 | } |
1705 | ||
d196a949 | 1706 | static int uart_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1707 | { |
833bb304 | 1708 | struct tty_driver *ttydrv = m->private; |
1da177e4 | 1709 | struct uart_driver *drv = ttydrv->driver_state; |
d196a949 | 1710 | int i; |
1da177e4 | 1711 | |
d196a949 | 1712 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
1da177e4 | 1713 | "", "", ""); |
d196a949 AD |
1714 | for (i = 0; i < drv->nr; i++) |
1715 | uart_line_info(m, drv, i); | |
1716 | return 0; | |
1da177e4 | 1717 | } |
d196a949 AD |
1718 | |
1719 | static int uart_proc_open(struct inode *inode, struct file *file) | |
1720 | { | |
d9dda78b | 1721 | return single_open(file, uart_proc_show, PDE_DATA(inode)); |
d196a949 AD |
1722 | } |
1723 | ||
1724 | static const struct file_operations uart_proc_fops = { | |
1725 | .owner = THIS_MODULE, | |
1726 | .open = uart_proc_open, | |
1727 | .read = seq_read, | |
1728 | .llseek = seq_lseek, | |
1729 | .release = single_release, | |
1730 | }; | |
1da177e4 LT |
1731 | #endif |
1732 | ||
4a1b5502 | 1733 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1734 | /* |
1735 | * uart_console_write - write a console message to a serial port | |
1736 | * @port: the port to write the message | |
1737 | * @s: array of characters | |
1738 | * @count: number of characters in string to write | |
1739 | * @write: function to write character to port | |
1740 | */ | |
1741 | void uart_console_write(struct uart_port *port, const char *s, | |
1742 | unsigned int count, | |
1743 | void (*putchar)(struct uart_port *, int)) | |
1744 | { | |
1745 | unsigned int i; | |
1746 | ||
1747 | for (i = 0; i < count; i++, s++) { | |
1748 | if (*s == '\n') | |
1749 | putchar(port, '\r'); | |
1750 | putchar(port, *s); | |
1751 | } | |
1752 | } | |
1753 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1754 | ||
1da177e4 LT |
1755 | /* |
1756 | * Check whether an invalid uart number has been specified, and | |
1757 | * if so, search for the first available port that does have | |
1758 | * console support. | |
1759 | */ | |
1760 | struct uart_port * __init | |
1761 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1762 | { | |
1763 | int idx = co->index; | |
1764 | ||
1765 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1766 | ports[idx].membase == NULL)) | |
1767 | for (idx = 0; idx < nr; idx++) | |
1768 | if (ports[idx].iobase != 0 || | |
1769 | ports[idx].membase != NULL) | |
1770 | break; | |
1771 | ||
1772 | co->index = idx; | |
1773 | ||
1774 | return ports + idx; | |
1775 | } | |
1776 | ||
1777 | /** | |
02088ca6 | 1778 | * uart_parse_options - Parse serial port baud/parity/bits/flow control. |
1da177e4 LT |
1779 | * @options: pointer to option string |
1780 | * @baud: pointer to an 'int' variable for the baud rate. | |
1781 | * @parity: pointer to an 'int' variable for the parity. | |
1782 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1783 | * @flow: pointer to an 'int' variable for the flow control character. | |
1784 | * | |
1785 | * uart_parse_options decodes a string containing the serial console | |
1786 | * options. The format of the string is <baud><parity><bits><flow>, | |
1787 | * eg: 115200n8r | |
1788 | */ | |
f2d937f3 | 1789 | void |
1da177e4 LT |
1790 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1791 | { | |
1792 | char *s = options; | |
1793 | ||
1794 | *baud = simple_strtoul(s, NULL, 10); | |
1795 | while (*s >= '0' && *s <= '9') | |
1796 | s++; | |
1797 | if (*s) | |
1798 | *parity = *s++; | |
1799 | if (*s) | |
1800 | *bits = *s++ - '0'; | |
1801 | if (*s) | |
1802 | *flow = *s; | |
1803 | } | |
f2d937f3 | 1804 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1805 | |
1806 | struct baud_rates { | |
1807 | unsigned int rate; | |
1808 | unsigned int cflag; | |
1809 | }; | |
1810 | ||
cb3592be | 1811 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1812 | { 921600, B921600 }, |
1813 | { 460800, B460800 }, | |
1814 | { 230400, B230400 }, | |
1815 | { 115200, B115200 }, | |
1816 | { 57600, B57600 }, | |
1817 | { 38400, B38400 }, | |
1818 | { 19200, B19200 }, | |
1819 | { 9600, B9600 }, | |
1820 | { 4800, B4800 }, | |
1821 | { 2400, B2400 }, | |
1822 | { 1200, B1200 }, | |
1823 | { 0, B38400 } | |
1824 | }; | |
1825 | ||
1826 | /** | |
1827 | * uart_set_options - setup the serial console parameters | |
1828 | * @port: pointer to the serial ports uart_port structure | |
1829 | * @co: console pointer | |
1830 | * @baud: baud rate | |
1831 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1832 | * @bits: number of data bits | |
1833 | * @flow: flow control character - 'r' (rts) | |
1834 | */ | |
f2d937f3 | 1835 | int |
1da177e4 LT |
1836 | uart_set_options(struct uart_port *port, struct console *co, |
1837 | int baud, int parity, int bits, int flow) | |
1838 | { | |
606d099c | 1839 | struct ktermios termios; |
149b36ea | 1840 | static struct ktermios dummy; |
1da177e4 LT |
1841 | int i; |
1842 | ||
976ecd12 RK |
1843 | /* |
1844 | * Ensure that the serial console lock is initialised | |
1845 | * early. | |
42b6a1ba RW |
1846 | * If this port is a console, then the spinlock is already |
1847 | * initialised. | |
976ecd12 | 1848 | */ |
42b6a1ba RW |
1849 | if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { |
1850 | spin_lock_init(&port->lock); | |
1851 | lockdep_set_class(&port->lock, &port_lock_key); | |
1852 | } | |
976ecd12 | 1853 | |
606d099c | 1854 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1855 | |
1856 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1857 | ||
1858 | /* | |
1859 | * Construct a cflag setting. | |
1860 | */ | |
1861 | for (i = 0; baud_rates[i].rate; i++) | |
1862 | if (baud_rates[i].rate <= baud) | |
1863 | break; | |
1864 | ||
1865 | termios.c_cflag |= baud_rates[i].cflag; | |
1866 | ||
1867 | if (bits == 7) | |
1868 | termios.c_cflag |= CS7; | |
1869 | else | |
1870 | termios.c_cflag |= CS8; | |
1871 | ||
1872 | switch (parity) { | |
1873 | case 'o': case 'O': | |
1874 | termios.c_cflag |= PARODD; | |
1875 | /*fall through*/ | |
1876 | case 'e': case 'E': | |
1877 | termios.c_cflag |= PARENB; | |
1878 | break; | |
1879 | } | |
1880 | ||
1881 | if (flow == 'r') | |
1882 | termios.c_cflag |= CRTSCTS; | |
1883 | ||
79492689 YL |
1884 | /* |
1885 | * some uarts on other side don't support no flow control. | |
1886 | * So we set * DTR in host uart to make them happy | |
1887 | */ | |
1888 | port->mctrl |= TIOCM_DTR; | |
1889 | ||
149b36ea | 1890 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1891 | /* |
1892 | * Allow the setting of the UART parameters with a NULL console | |
1893 | * too: | |
1894 | */ | |
1895 | if (co) | |
1896 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1897 | |
1898 | return 0; | |
1899 | } | |
f2d937f3 | 1900 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1901 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1902 | ||
cf75525f JS |
1903 | /** |
1904 | * uart_change_pm - set power state of the port | |
1905 | * | |
1906 | * @state: port descriptor | |
1907 | * @pm_state: new state | |
1908 | * | |
1909 | * Locking: port->mutex has to be held | |
1910 | */ | |
6f538fe3 LW |
1911 | static void uart_change_pm(struct uart_state *state, |
1912 | enum uart_pm_state pm_state) | |
1da177e4 | 1913 | { |
ebd2c8f6 | 1914 | struct uart_port *port = state->uart_port; |
1281e360 AV |
1915 | |
1916 | if (state->pm_state != pm_state) { | |
1917 | if (port->ops->pm) | |
1918 | port->ops->pm(port, pm_state, state->pm_state); | |
1919 | state->pm_state = pm_state; | |
1920 | } | |
1da177e4 LT |
1921 | } |
1922 | ||
b3b708fa GL |
1923 | struct uart_match { |
1924 | struct uart_port *port; | |
1925 | struct uart_driver *driver; | |
1926 | }; | |
1927 | ||
1928 | static int serial_match_port(struct device *dev, void *data) | |
1929 | { | |
1930 | struct uart_match *match = data; | |
7ca796f4 GL |
1931 | struct tty_driver *tty_drv = match->driver->tty_driver; |
1932 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
1933 | match->port->line; | |
b3b708fa GL |
1934 | |
1935 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1936 | } | |
1937 | ||
ccce6deb | 1938 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1939 | { |
ccce6deb AC |
1940 | struct uart_state *state = drv->state + uport->line; |
1941 | struct tty_port *port = &state->port; | |
b3b708fa | 1942 | struct device *tty_dev; |
ccce6deb | 1943 | struct uart_match match = {uport, drv}; |
1da177e4 | 1944 | |
a2bceae0 | 1945 | mutex_lock(&port->mutex); |
1da177e4 | 1946 | |
ccce6deb | 1947 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
b3b708fa | 1948 | if (device_may_wakeup(tty_dev)) { |
3f960dbb G |
1949 | if (!enable_irq_wake(uport->irq)) |
1950 | uport->irq_wake = 1; | |
b3b708fa | 1951 | put_device(tty_dev); |
a2bceae0 | 1952 | mutex_unlock(&port->mutex); |
b3b708fa GL |
1953 | return 0; |
1954 | } | |
5a65dcc0 FV |
1955 | put_device(tty_dev); |
1956 | ||
4547be78 SB |
1957 | if (console_suspend_enabled || !uart_console(uport)) |
1958 | uport->suspended = 1; | |
b3b708fa | 1959 | |
ccce6deb AC |
1960 | if (port->flags & ASYNC_INITIALIZED) { |
1961 | const struct uart_ops *ops = uport->ops; | |
c8c6bfa3 | 1962 | int tries; |
1da177e4 | 1963 | |
4547be78 SB |
1964 | if (console_suspend_enabled || !uart_console(uport)) { |
1965 | set_bit(ASYNCB_SUSPENDED, &port->flags); | |
1966 | clear_bit(ASYNCB_INITIALIZED, &port->flags); | |
a6b93a90 | 1967 | |
4547be78 SB |
1968 | spin_lock_irq(&uport->lock); |
1969 | ops->stop_tx(uport); | |
1970 | ops->set_mctrl(uport, 0); | |
1971 | ops->stop_rx(uport); | |
1972 | spin_unlock_irq(&uport->lock); | |
1973 | } | |
1da177e4 LT |
1974 | |
1975 | /* | |
1976 | * Wait for the transmitter to empty. | |
1977 | */ | |
ccce6deb | 1978 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
1da177e4 | 1979 | msleep(10); |
c8c6bfa3 | 1980 | if (!tries) |
a46c9994 AC |
1981 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
1982 | "transmitter\n", | |
ccce6deb AC |
1983 | uport->dev ? dev_name(uport->dev) : "", |
1984 | uport->dev ? ": " : "", | |
8440838b | 1985 | drv->dev_name, |
ccce6deb | 1986 | drv->tty_driver->name_base + uport->line); |
1da177e4 | 1987 | |
4547be78 SB |
1988 | if (console_suspend_enabled || !uart_console(uport)) |
1989 | ops->shutdown(uport); | |
1da177e4 LT |
1990 | } |
1991 | ||
1992 | /* | |
1993 | * Disable the console device before suspending. | |
1994 | */ | |
4547be78 | 1995 | if (console_suspend_enabled && uart_console(uport)) |
ccce6deb | 1996 | console_stop(uport->cons); |
1da177e4 | 1997 | |
4547be78 | 1998 | if (console_suspend_enabled || !uart_console(uport)) |
6f538fe3 | 1999 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 | 2000 | |
a2bceae0 | 2001 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2002 | |
2003 | return 0; | |
2004 | } | |
2005 | ||
ccce6deb | 2006 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2007 | { |
ccce6deb AC |
2008 | struct uart_state *state = drv->state + uport->line; |
2009 | struct tty_port *port = &state->port; | |
03a74dcc | 2010 | struct device *tty_dev; |
ccce6deb | 2011 | struct uart_match match = {uport, drv}; |
ba15ab0e | 2012 | struct ktermios termios; |
1da177e4 | 2013 | |
a2bceae0 | 2014 | mutex_lock(&port->mutex); |
1da177e4 | 2015 | |
ccce6deb AC |
2016 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
2017 | if (!uport->suspended && device_may_wakeup(tty_dev)) { | |
3f960dbb G |
2018 | if (uport->irq_wake) { |
2019 | disable_irq_wake(uport->irq); | |
2020 | uport->irq_wake = 0; | |
2021 | } | |
5a65dcc0 | 2022 | put_device(tty_dev); |
a2bceae0 | 2023 | mutex_unlock(&port->mutex); |
b3b708fa GL |
2024 | return 0; |
2025 | } | |
5a65dcc0 | 2026 | put_device(tty_dev); |
ccce6deb | 2027 | uport->suspended = 0; |
b3b708fa | 2028 | |
1da177e4 LT |
2029 | /* |
2030 | * Re-enable the console device after suspending. | |
2031 | */ | |
5933a161 | 2032 | if (uart_console(uport)) { |
891b9dd1 JW |
2033 | /* |
2034 | * First try to use the console cflag setting. | |
2035 | */ | |
2036 | memset(&termios, 0, sizeof(struct ktermios)); | |
2037 | termios.c_cflag = uport->cons->cflag; | |
2038 | ||
2039 | /* | |
2040 | * If that's unset, use the tty termios setting. | |
2041 | */ | |
adc8d746 AC |
2042 | if (port->tty && termios.c_cflag == 0) |
2043 | termios = port->tty->termios; | |
891b9dd1 | 2044 | |
94abc56f | 2045 | if (console_suspend_enabled) |
6f538fe3 | 2046 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb | 2047 | uport->ops->set_termios(uport, &termios, NULL); |
5933a161 YK |
2048 | if (console_suspend_enabled) |
2049 | console_start(uport->cons); | |
1da177e4 LT |
2050 | } |
2051 | ||
ccce6deb AC |
2052 | if (port->flags & ASYNC_SUSPENDED) { |
2053 | const struct uart_ops *ops = uport->ops; | |
ee31b337 | 2054 | int ret; |
1da177e4 | 2055 | |
6f538fe3 | 2056 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb AC |
2057 | spin_lock_irq(&uport->lock); |
2058 | ops->set_mctrl(uport, 0); | |
2059 | spin_unlock_irq(&uport->lock); | |
4547be78 | 2060 | if (console_suspend_enabled || !uart_console(uport)) { |
19225135 AC |
2061 | /* Protected by port mutex for now */ |
2062 | struct tty_struct *tty = port->tty; | |
4547be78 SB |
2063 | ret = ops->startup(uport); |
2064 | if (ret == 0) { | |
19225135 AC |
2065 | if (tty) |
2066 | uart_change_speed(tty, state, NULL); | |
4547be78 SB |
2067 | spin_lock_irq(&uport->lock); |
2068 | ops->set_mctrl(uport, uport->mctrl); | |
2069 | ops->start_tx(uport); | |
2070 | spin_unlock_irq(&uport->lock); | |
2071 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
2072 | } else { | |
2073 | /* | |
2074 | * Failed to resume - maybe hardware went away? | |
2075 | * Clear the "initialized" flag so we won't try | |
2076 | * to call the low level drivers shutdown method. | |
2077 | */ | |
19225135 | 2078 | uart_shutdown(tty, state); |
4547be78 | 2079 | } |
ee31b337 | 2080 | } |
a6b93a90 | 2081 | |
ccce6deb | 2082 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
2083 | } |
2084 | ||
a2bceae0 | 2085 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2086 | |
2087 | return 0; | |
2088 | } | |
2089 | ||
2090 | static inline void | |
2091 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2092 | { | |
30b7a3bc RK |
2093 | char address[64]; |
2094 | ||
1da177e4 LT |
2095 | switch (port->iotype) { |
2096 | case UPIO_PORT: | |
9bde10a4 | 2097 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2098 | break; |
2099 | case UPIO_HUB6: | |
30b7a3bc | 2100 | snprintf(address, sizeof(address), |
9bde10a4 | 2101 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2102 | break; |
2103 | case UPIO_MEM: | |
2104 | case UPIO_MEM32: | |
21c614a7 | 2105 | case UPIO_AU: |
3be91ec7 | 2106 | case UPIO_TSI: |
30b7a3bc | 2107 | snprintf(address, sizeof(address), |
4f640efb | 2108 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2109 | break; |
2110 | default: | |
2111 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2112 | break; |
2113 | } | |
30b7a3bc | 2114 | |
7d12b976 | 2115 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n", |
4bfe090b | 2116 | port->dev ? dev_name(port->dev) : "", |
0cf669d5 | 2117 | port->dev ? ": " : "", |
8440838b DM |
2118 | drv->dev_name, |
2119 | drv->tty_driver->name_base + port->line, | |
7d12b976 | 2120 | address, port->irq, port->uartclk / 16, uart_type(port)); |
1da177e4 LT |
2121 | } |
2122 | ||
2123 | static void | |
2124 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2125 | struct uart_port *port) | |
2126 | { | |
2127 | unsigned int flags; | |
2128 | ||
2129 | /* | |
2130 | * If there isn't a port here, don't do anything further. | |
2131 | */ | |
2132 | if (!port->iobase && !port->mapbase && !port->membase) | |
2133 | return; | |
2134 | ||
2135 | /* | |
2136 | * Now do the auto configuration stuff. Note that config_port | |
2137 | * is expected to claim the resources and map the port for us. | |
2138 | */ | |
8e23fcc8 | 2139 | flags = 0; |
1da177e4 LT |
2140 | if (port->flags & UPF_AUTO_IRQ) |
2141 | flags |= UART_CONFIG_IRQ; | |
2142 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2143 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2144 | port->type = PORT_UNKNOWN; | |
2145 | flags |= UART_CONFIG_TYPE; | |
2146 | } | |
1da177e4 LT |
2147 | port->ops->config_port(port, flags); |
2148 | } | |
2149 | ||
2150 | if (port->type != PORT_UNKNOWN) { | |
2151 | unsigned long flags; | |
2152 | ||
2153 | uart_report_port(drv, port); | |
2154 | ||
3689a0ec | 2155 | /* Power up port for set_mctrl() */ |
6f538fe3 | 2156 | uart_change_pm(state, UART_PM_STATE_ON); |
3689a0ec | 2157 | |
1da177e4 LT |
2158 | /* |
2159 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2160 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2161 | * We probably don't need a spinlock around this, but |
2162 | */ | |
2163 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2164 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2165 | spin_unlock_irqrestore(&port->lock, flags); |
2166 | ||
97d97224 RK |
2167 | /* |
2168 | * If this driver supports console, and it hasn't been | |
2169 | * successfully registered yet, try to re-register it. | |
2170 | * It may be that the port was not available. | |
2171 | */ | |
2172 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2173 | register_console(port->cons); | |
2174 | ||
1da177e4 LT |
2175 | /* |
2176 | * Power down all ports by default, except the | |
2177 | * console if we have one. | |
2178 | */ | |
2179 | if (!uart_console(port)) | |
6f538fe3 | 2180 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 LT |
2181 | } |
2182 | } | |
2183 | ||
f2d937f3 JW |
2184 | #ifdef CONFIG_CONSOLE_POLL |
2185 | ||
2186 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2187 | { | |
2188 | struct uart_driver *drv = driver->driver_state; | |
2189 | struct uart_state *state = drv->state + line; | |
2190 | struct uart_port *port; | |
2191 | int baud = 9600; | |
2192 | int bits = 8; | |
2193 | int parity = 'n'; | |
2194 | int flow = 'n'; | |
c7f3e708 | 2195 | int ret; |
f2d937f3 | 2196 | |
ebd2c8f6 | 2197 | if (!state || !state->uart_port) |
f2d937f3 JW |
2198 | return -1; |
2199 | ||
ebd2c8f6 | 2200 | port = state->uart_port; |
f2d937f3 JW |
2201 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
2202 | return -1; | |
2203 | ||
c7f3e708 AV |
2204 | if (port->ops->poll_init) { |
2205 | struct tty_port *tport = &state->port; | |
2206 | ||
2207 | ret = 0; | |
2208 | mutex_lock(&tport->mutex); | |
2209 | /* | |
2210 | * We don't set ASYNCB_INITIALIZED as we only initialized the | |
2211 | * hw, e.g. state->xmit is still uninitialized. | |
2212 | */ | |
2213 | if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) | |
2214 | ret = port->ops->poll_init(port); | |
2215 | mutex_unlock(&tport->mutex); | |
2216 | if (ret) | |
2217 | return ret; | |
2218 | } | |
2219 | ||
f2d937f3 JW |
2220 | if (options) { |
2221 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2222 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2223 | } | |
2224 | ||
2225 | return 0; | |
2226 | } | |
2227 | ||
2228 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2229 | { | |
2230 | struct uart_driver *drv = driver->driver_state; | |
2231 | struct uart_state *state = drv->state + line; | |
2232 | struct uart_port *port; | |
2233 | ||
ebd2c8f6 | 2234 | if (!state || !state->uart_port) |
f2d937f3 JW |
2235 | return -1; |
2236 | ||
ebd2c8f6 | 2237 | port = state->uart_port; |
f2d937f3 JW |
2238 | return port->ops->poll_get_char(port); |
2239 | } | |
2240 | ||
2241 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2242 | { | |
2243 | struct uart_driver *drv = driver->driver_state; | |
2244 | struct uart_state *state = drv->state + line; | |
2245 | struct uart_port *port; | |
2246 | ||
ebd2c8f6 | 2247 | if (!state || !state->uart_port) |
f2d937f3 JW |
2248 | return; |
2249 | ||
ebd2c8f6 | 2250 | port = state->uart_port; |
c7d44a02 DA |
2251 | |
2252 | if (ch == '\n') | |
2253 | port->ops->poll_put_char(port, '\r'); | |
f2d937f3 JW |
2254 | port->ops->poll_put_char(port, ch); |
2255 | } | |
2256 | #endif | |
2257 | ||
b68e31d0 | 2258 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2259 | .open = uart_open, |
2260 | .close = uart_close, | |
2261 | .write = uart_write, | |
2262 | .put_char = uart_put_char, | |
2263 | .flush_chars = uart_flush_chars, | |
2264 | .write_room = uart_write_room, | |
2265 | .chars_in_buffer= uart_chars_in_buffer, | |
2266 | .flush_buffer = uart_flush_buffer, | |
2267 | .ioctl = uart_ioctl, | |
2268 | .throttle = uart_throttle, | |
2269 | .unthrottle = uart_unthrottle, | |
2270 | .send_xchar = uart_send_xchar, | |
2271 | .set_termios = uart_set_termios, | |
64e9159f | 2272 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2273 | .stop = uart_stop, |
2274 | .start = uart_start, | |
2275 | .hangup = uart_hangup, | |
2276 | .break_ctl = uart_break_ctl, | |
2277 | .wait_until_sent= uart_wait_until_sent, | |
2278 | #ifdef CONFIG_PROC_FS | |
d196a949 | 2279 | .proc_fops = &uart_proc_fops, |
1da177e4 LT |
2280 | #endif |
2281 | .tiocmget = uart_tiocmget, | |
2282 | .tiocmset = uart_tiocmset, | |
d281da7f | 2283 | .get_icount = uart_get_icount, |
f2d937f3 JW |
2284 | #ifdef CONFIG_CONSOLE_POLL |
2285 | .poll_init = uart_poll_init, | |
2286 | .poll_get_char = uart_poll_get_char, | |
2287 | .poll_put_char = uart_poll_put_char, | |
2288 | #endif | |
1da177e4 LT |
2289 | }; |
2290 | ||
de0c8cb3 | 2291 | static const struct tty_port_operations uart_port_ops = { |
0b1db830 JS |
2292 | .activate = uart_port_activate, |
2293 | .shutdown = uart_port_shutdown, | |
de0c8cb3 AC |
2294 | .carrier_raised = uart_carrier_raised, |
2295 | .dtr_rts = uart_dtr_rts, | |
2296 | }; | |
2297 | ||
1da177e4 LT |
2298 | /** |
2299 | * uart_register_driver - register a driver with the uart core layer | |
2300 | * @drv: low level driver structure | |
2301 | * | |
2302 | * Register a uart driver with the core driver. We in turn register | |
2303 | * with the tty layer, and initialise the core driver per-port state. | |
2304 | * | |
2305 | * We have a proc file in /proc/tty/driver which is named after the | |
2306 | * normal driver. | |
2307 | * | |
2308 | * drv->port should be NULL, and the per-port structures should be | |
2309 | * registered using uart_add_one_port after this call has succeeded. | |
2310 | */ | |
2311 | int uart_register_driver(struct uart_driver *drv) | |
2312 | { | |
9e845abf | 2313 | struct tty_driver *normal; |
1da177e4 LT |
2314 | int i, retval; |
2315 | ||
2316 | BUG_ON(drv->state); | |
2317 | ||
2318 | /* | |
2319 | * Maybe we should be using a slab cache for this, especially if | |
2320 | * we have a large number of ports to handle. | |
2321 | */ | |
8f31bb39 | 2322 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2323 | if (!drv->state) |
2324 | goto out; | |
2325 | ||
9e845abf | 2326 | normal = alloc_tty_driver(drv->nr); |
1da177e4 | 2327 | if (!normal) |
9e845abf | 2328 | goto out_kfree; |
1da177e4 LT |
2329 | |
2330 | drv->tty_driver = normal; | |
2331 | ||
1da177e4 | 2332 | normal->driver_name = drv->driver_name; |
1da177e4 LT |
2333 | normal->name = drv->dev_name; |
2334 | normal->major = drv->major; | |
2335 | normal->minor_start = drv->minor; | |
2336 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2337 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2338 | normal->init_termios = tty_std_termios; | |
2339 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2340 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2341 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2342 | normal->driver_state = drv; |
2343 | tty_set_operations(normal, &uart_ops); | |
2344 | ||
2345 | /* | |
2346 | * Initialise the UART state(s). | |
2347 | */ | |
2348 | for (i = 0; i < drv->nr; i++) { | |
2349 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 2350 | struct tty_port *port = &state->port; |
1da177e4 | 2351 | |
a2bceae0 | 2352 | tty_port_init(port); |
de0c8cb3 | 2353 | port->ops = &uart_port_ops; |
4cb0fbfd JS |
2354 | port->close_delay = HZ / 2; /* .5 seconds */ |
2355 | port->closing_wait = 30 * HZ;/* 30 seconds */ | |
1da177e4 LT |
2356 | } |
2357 | ||
2358 | retval = tty_register_driver(normal); | |
9e845abf AGR |
2359 | if (retval >= 0) |
2360 | return retval; | |
2361 | ||
191c5f10 JS |
2362 | for (i = 0; i < drv->nr; i++) |
2363 | tty_port_destroy(&drv->state[i].port); | |
9e845abf AGR |
2364 | put_tty_driver(normal); |
2365 | out_kfree: | |
2366 | kfree(drv->state); | |
2367 | out: | |
2368 | return -ENOMEM; | |
1da177e4 LT |
2369 | } |
2370 | ||
2371 | /** | |
2372 | * uart_unregister_driver - remove a driver from the uart core layer | |
2373 | * @drv: low level driver structure | |
2374 | * | |
2375 | * Remove all references to a driver from the core driver. The low | |
2376 | * level driver must have removed all its ports via the | |
2377 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2378 | * (ie, drv->port == NULL) | |
2379 | */ | |
2380 | void uart_unregister_driver(struct uart_driver *drv) | |
2381 | { | |
2382 | struct tty_driver *p = drv->tty_driver; | |
191c5f10 JS |
2383 | unsigned int i; |
2384 | ||
1da177e4 LT |
2385 | tty_unregister_driver(p); |
2386 | put_tty_driver(p); | |
191c5f10 JS |
2387 | for (i = 0; i < drv->nr; i++) |
2388 | tty_port_destroy(&drv->state[i].port); | |
1da177e4 | 2389 | kfree(drv->state); |
1e66cded | 2390 | drv->state = NULL; |
1da177e4 LT |
2391 | drv->tty_driver = NULL; |
2392 | } | |
2393 | ||
2394 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2395 | { | |
2396 | struct uart_driver *p = co->data; | |
2397 | *index = co->index; | |
2398 | return p->tty_driver; | |
2399 | } | |
2400 | ||
6915c0e4 TH |
2401 | static ssize_t uart_get_attr_uartclk(struct device *dev, |
2402 | struct device_attribute *attr, char *buf) | |
2403 | { | |
bebe73e3 | 2404 | struct serial_struct tmp; |
6915c0e4 | 2405 | struct tty_port *port = dev_get_drvdata(dev); |
6915c0e4 | 2406 | |
9f109694 | 2407 | uart_get_info(port, &tmp); |
bebe73e3 | 2408 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); |
6915c0e4 TH |
2409 | } |
2410 | ||
373bac4c AC |
2411 | static ssize_t uart_get_attr_type(struct device *dev, |
2412 | struct device_attribute *attr, char *buf) | |
2413 | { | |
2414 | struct serial_struct tmp; | |
2415 | struct tty_port *port = dev_get_drvdata(dev); | |
2416 | ||
2417 | uart_get_info(port, &tmp); | |
2418 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); | |
2419 | } | |
2420 | static ssize_t uart_get_attr_line(struct device *dev, | |
2421 | struct device_attribute *attr, char *buf) | |
2422 | { | |
2423 | struct serial_struct tmp; | |
2424 | struct tty_port *port = dev_get_drvdata(dev); | |
2425 | ||
2426 | uart_get_info(port, &tmp); | |
2427 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); | |
2428 | } | |
2429 | ||
2430 | static ssize_t uart_get_attr_port(struct device *dev, | |
2431 | struct device_attribute *attr, char *buf) | |
2432 | { | |
2433 | struct serial_struct tmp; | |
2434 | struct tty_port *port = dev_get_drvdata(dev); | |
fd985e1d | 2435 | unsigned long ioaddr; |
373bac4c AC |
2436 | |
2437 | uart_get_info(port, &tmp); | |
fd985e1d AM |
2438 | ioaddr = tmp.port; |
2439 | if (HIGH_BITS_OFFSET) | |
2440 | ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; | |
2441 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); | |
373bac4c AC |
2442 | } |
2443 | ||
2444 | static ssize_t uart_get_attr_irq(struct device *dev, | |
2445 | struct device_attribute *attr, char *buf) | |
2446 | { | |
2447 | struct serial_struct tmp; | |
2448 | struct tty_port *port = dev_get_drvdata(dev); | |
2449 | ||
2450 | uart_get_info(port, &tmp); | |
2451 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); | |
2452 | } | |
2453 | ||
2454 | static ssize_t uart_get_attr_flags(struct device *dev, | |
2455 | struct device_attribute *attr, char *buf) | |
2456 | { | |
2457 | struct serial_struct tmp; | |
2458 | struct tty_port *port = dev_get_drvdata(dev); | |
2459 | ||
2460 | uart_get_info(port, &tmp); | |
2461 | return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); | |
2462 | } | |
2463 | ||
2464 | static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, | |
2465 | struct device_attribute *attr, char *buf) | |
2466 | { | |
2467 | struct serial_struct tmp; | |
2468 | struct tty_port *port = dev_get_drvdata(dev); | |
2469 | ||
2470 | uart_get_info(port, &tmp); | |
2471 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); | |
2472 | } | |
2473 | ||
2474 | ||
2475 | static ssize_t uart_get_attr_close_delay(struct device *dev, | |
2476 | struct device_attribute *attr, char *buf) | |
2477 | { | |
2478 | struct serial_struct tmp; | |
2479 | struct tty_port *port = dev_get_drvdata(dev); | |
2480 | ||
2481 | uart_get_info(port, &tmp); | |
2482 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); | |
2483 | } | |
2484 | ||
2485 | ||
2486 | static ssize_t uart_get_attr_closing_wait(struct device *dev, | |
2487 | struct device_attribute *attr, char *buf) | |
2488 | { | |
2489 | struct serial_struct tmp; | |
2490 | struct tty_port *port = dev_get_drvdata(dev); | |
2491 | ||
2492 | uart_get_info(port, &tmp); | |
2493 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); | |
2494 | } | |
2495 | ||
2496 | static ssize_t uart_get_attr_custom_divisor(struct device *dev, | |
2497 | struct device_attribute *attr, char *buf) | |
2498 | { | |
2499 | struct serial_struct tmp; | |
2500 | struct tty_port *port = dev_get_drvdata(dev); | |
2501 | ||
2502 | uart_get_info(port, &tmp); | |
2503 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); | |
2504 | } | |
2505 | ||
2506 | static ssize_t uart_get_attr_io_type(struct device *dev, | |
2507 | struct device_attribute *attr, char *buf) | |
2508 | { | |
2509 | struct serial_struct tmp; | |
2510 | struct tty_port *port = dev_get_drvdata(dev); | |
2511 | ||
2512 | uart_get_info(port, &tmp); | |
2513 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); | |
2514 | } | |
2515 | ||
2516 | static ssize_t uart_get_attr_iomem_base(struct device *dev, | |
2517 | struct device_attribute *attr, char *buf) | |
2518 | { | |
2519 | struct serial_struct tmp; | |
2520 | struct tty_port *port = dev_get_drvdata(dev); | |
2521 | ||
2522 | uart_get_info(port, &tmp); | |
2523 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); | |
2524 | } | |
2525 | ||
2526 | static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, | |
2527 | struct device_attribute *attr, char *buf) | |
2528 | { | |
2529 | struct serial_struct tmp; | |
2530 | struct tty_port *port = dev_get_drvdata(dev); | |
2531 | ||
2532 | uart_get_info(port, &tmp); | |
2533 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); | |
2534 | } | |
2535 | ||
2536 | static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); | |
2537 | static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); | |
2538 | static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); | |
2539 | static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); | |
2540 | static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); | |
2541 | static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); | |
6915c0e4 | 2542 | static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); |
373bac4c AC |
2543 | static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); |
2544 | static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); | |
2545 | static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); | |
2546 | static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); | |
2547 | static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); | |
2548 | static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); | |
6915c0e4 TH |
2549 | |
2550 | static struct attribute *tty_dev_attrs[] = { | |
373bac4c AC |
2551 | &dev_attr_type.attr, |
2552 | &dev_attr_line.attr, | |
2553 | &dev_attr_port.attr, | |
2554 | &dev_attr_irq.attr, | |
2555 | &dev_attr_flags.attr, | |
2556 | &dev_attr_xmit_fifo_size.attr, | |
6915c0e4 | 2557 | &dev_attr_uartclk.attr, |
373bac4c AC |
2558 | &dev_attr_close_delay.attr, |
2559 | &dev_attr_closing_wait.attr, | |
2560 | &dev_attr_custom_divisor.attr, | |
2561 | &dev_attr_io_type.attr, | |
2562 | &dev_attr_iomem_base.attr, | |
2563 | &dev_attr_iomem_reg_shift.attr, | |
6915c0e4 TH |
2564 | NULL, |
2565 | }; | |
2566 | ||
b1b79916 | 2567 | static const struct attribute_group tty_dev_attr_group = { |
6915c0e4 TH |
2568 | .attrs = tty_dev_attrs, |
2569 | }; | |
2570 | ||
2571 | static const struct attribute_group *tty_dev_attr_groups[] = { | |
2572 | &tty_dev_attr_group, | |
2573 | NULL | |
2574 | }; | |
2575 | ||
9f109694 | 2576 | |
1da177e4 LT |
2577 | /** |
2578 | * uart_add_one_port - attach a driver-defined port structure | |
2579 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2580 | * @uport: uart port structure to use for this port. |
1da177e4 LT |
2581 | * |
2582 | * This allows the driver to register its own uart_port structure | |
2583 | * with the core driver. The main purpose is to allow the low | |
2584 | * level uart drivers to expand uart_port, rather than having yet | |
2585 | * more levels of structures. | |
2586 | */ | |
a2bceae0 | 2587 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 LT |
2588 | { |
2589 | struct uart_state *state; | |
a2bceae0 | 2590 | struct tty_port *port; |
1da177e4 | 2591 | int ret = 0; |
b3b708fa | 2592 | struct device *tty_dev; |
1da177e4 LT |
2593 | |
2594 | BUG_ON(in_interrupt()); | |
2595 | ||
a2bceae0 | 2596 | if (uport->line >= drv->nr) |
1da177e4 LT |
2597 | return -EINVAL; |
2598 | ||
a2bceae0 AC |
2599 | state = drv->state + uport->line; |
2600 | port = &state->port; | |
1da177e4 | 2601 | |
f392ecfa | 2602 | mutex_lock(&port_mutex); |
a2bceae0 | 2603 | mutex_lock(&port->mutex); |
ebd2c8f6 | 2604 | if (state->uart_port) { |
1da177e4 LT |
2605 | ret = -EINVAL; |
2606 | goto out; | |
2607 | } | |
2608 | ||
a2bceae0 | 2609 | state->uart_port = uport; |
6f538fe3 | 2610 | state->pm_state = UART_PM_STATE_UNDEFINED; |
1da177e4 | 2611 | |
a2bceae0 AC |
2612 | uport->cons = drv->cons; |
2613 | uport->state = state; | |
1da177e4 | 2614 | |
976ecd12 RK |
2615 | /* |
2616 | * If this port is a console, then the spinlock is already | |
2617 | * initialised. | |
2618 | */ | |
a2bceae0 AC |
2619 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
2620 | spin_lock_init(&uport->lock); | |
2621 | lockdep_set_class(&uport->lock, &port_lock_key); | |
13e83599 | 2622 | } |
976ecd12 | 2623 | |
a2bceae0 | 2624 | uart_configure_port(drv, state, uport); |
1da177e4 LT |
2625 | |
2626 | /* | |
2627 | * Register the port whether it's detected or not. This allows | |
015355b7 | 2628 | * setserial to be used to alter this port's parameters. |
1da177e4 | 2629 | */ |
b1b79916 TH |
2630 | tty_dev = tty_port_register_device_attr(port, drv->tty_driver, |
2631 | uport->line, uport->dev, port, tty_dev_attr_groups); | |
b3b708fa | 2632 | if (likely(!IS_ERR(tty_dev))) { |
77359835 SG |
2633 | device_set_wakeup_capable(tty_dev, 1); |
2634 | } else { | |
b3b708fa | 2635 | printk(KERN_ERR "Cannot register tty device on line %d\n", |
a2bceae0 | 2636 | uport->line); |
77359835 | 2637 | } |
1da177e4 | 2638 | |
68ac64cd RK |
2639 | /* |
2640 | * Ensure UPF_DEAD is not set. | |
2641 | */ | |
a2bceae0 | 2642 | uport->flags &= ~UPF_DEAD; |
68ac64cd | 2643 | |
1da177e4 | 2644 | out: |
a2bceae0 | 2645 | mutex_unlock(&port->mutex); |
f392ecfa | 2646 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2647 | |
2648 | return ret; | |
2649 | } | |
2650 | ||
2651 | /** | |
2652 | * uart_remove_one_port - detach a driver defined port structure | |
2653 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2654 | * @uport: uart port structure for this port |
1da177e4 LT |
2655 | * |
2656 | * This unhooks (and hangs up) the specified port structure from the | |
2657 | * core driver. No further calls will be made to the low-level code | |
2658 | * for this port. | |
2659 | */ | |
a2bceae0 | 2660 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2661 | { |
a2bceae0 AC |
2662 | struct uart_state *state = drv->state + uport->line; |
2663 | struct tty_port *port = &state->port; | |
4c6d5b4d | 2664 | struct tty_struct *tty; |
b342dd51 | 2665 | int ret = 0; |
1da177e4 LT |
2666 | |
2667 | BUG_ON(in_interrupt()); | |
2668 | ||
a2bceae0 | 2669 | if (state->uart_port != uport) |
1da177e4 | 2670 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
a2bceae0 | 2671 | state->uart_port, uport); |
1da177e4 | 2672 | |
f392ecfa | 2673 | mutex_lock(&port_mutex); |
1da177e4 | 2674 | |
68ac64cd RK |
2675 | /* |
2676 | * Mark the port "dead" - this prevents any opens from | |
2677 | * succeeding while we shut down the port. | |
2678 | */ | |
a2bceae0 | 2679 | mutex_lock(&port->mutex); |
b342dd51 CG |
2680 | if (!state->uart_port) { |
2681 | mutex_unlock(&port->mutex); | |
2682 | ret = -EINVAL; | |
2683 | goto out; | |
2684 | } | |
a2bceae0 AC |
2685 | uport->flags |= UPF_DEAD; |
2686 | mutex_unlock(&port->mutex); | |
68ac64cd | 2687 | |
1da177e4 | 2688 | /* |
aa4148cf | 2689 | * Remove the devices from the tty layer |
1da177e4 | 2690 | */ |
a2bceae0 | 2691 | tty_unregister_device(drv->tty_driver, uport->line); |
1da177e4 | 2692 | |
4c6d5b4d GU |
2693 | tty = tty_port_tty_get(port); |
2694 | if (tty) { | |
a2bceae0 | 2695 | tty_vhangup(port->tty); |
4c6d5b4d GU |
2696 | tty_kref_put(tty); |
2697 | } | |
68ac64cd | 2698 | |
5f5c9ae5 GU |
2699 | /* |
2700 | * If the port is used as a console, unregister it | |
2701 | */ | |
2702 | if (uart_console(uport)) | |
2703 | unregister_console(uport->cons); | |
2704 | ||
68ac64cd RK |
2705 | /* |
2706 | * Free the port IO and memory resources, if any. | |
2707 | */ | |
a2bceae0 AC |
2708 | if (uport->type != PORT_UNKNOWN) |
2709 | uport->ops->release_port(uport); | |
68ac64cd RK |
2710 | |
2711 | /* | |
2712 | * Indicate that there isn't a port here anymore. | |
2713 | */ | |
a2bceae0 | 2714 | uport->type = PORT_UNKNOWN; |
68ac64cd | 2715 | |
ebd2c8f6 | 2716 | state->uart_port = NULL; |
b342dd51 | 2717 | out: |
f392ecfa | 2718 | mutex_unlock(&port_mutex); |
1da177e4 | 2719 | |
b342dd51 | 2720 | return ret; |
1da177e4 LT |
2721 | } |
2722 | ||
2723 | /* | |
2724 | * Are the two ports equivalent? | |
2725 | */ | |
2726 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2727 | { | |
2728 | if (port1->iotype != port2->iotype) | |
2729 | return 0; | |
2730 | ||
2731 | switch (port1->iotype) { | |
2732 | case UPIO_PORT: | |
2733 | return (port1->iobase == port2->iobase); | |
2734 | case UPIO_HUB6: | |
2735 | return (port1->iobase == port2->iobase) && | |
2736 | (port1->hub6 == port2->hub6); | |
2737 | case UPIO_MEM: | |
d21b55d3 SS |
2738 | case UPIO_MEM32: |
2739 | case UPIO_AU: | |
2740 | case UPIO_TSI: | |
1624f003 | 2741 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2742 | } |
2743 | return 0; | |
2744 | } | |
2745 | EXPORT_SYMBOL(uart_match_port); | |
2746 | ||
027d7dac JS |
2747 | /** |
2748 | * uart_handle_dcd_change - handle a change of carrier detect state | |
2749 | * @uport: uart_port structure for the open port | |
2750 | * @status: new carrier detect status, nonzero if active | |
2751 | */ | |
2752 | void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) | |
2753 | { | |
42381572 | 2754 | struct tty_port *port = &uport->state->port; |
43eca0ae | 2755 | struct tty_struct *tty = port->tty; |
42381572 | 2756 | struct tty_ldisc *ld = tty ? tty_ldisc_ref(tty) : NULL; |
027d7dac | 2757 | |
42381572 GS |
2758 | if (ld) { |
2759 | if (ld->ops->dcd_change) | |
2760 | ld->ops->dcd_change(tty, status); | |
2761 | tty_ldisc_deref(ld); | |
2762 | } | |
027d7dac JS |
2763 | |
2764 | uport->icount.dcd++; | |
027d7dac JS |
2765 | |
2766 | if (port->flags & ASYNC_CHECK_CD) { | |
2767 | if (status) | |
2768 | wake_up_interruptible(&port->open_wait); | |
43eca0ae AC |
2769 | else if (tty) |
2770 | tty_hangup(tty); | |
027d7dac | 2771 | } |
027d7dac JS |
2772 | } |
2773 | EXPORT_SYMBOL_GPL(uart_handle_dcd_change); | |
2774 | ||
2775 | /** | |
2776 | * uart_handle_cts_change - handle a change of clear-to-send state | |
2777 | * @uport: uart_port structure for the open port | |
2778 | * @status: new clear to send status, nonzero if active | |
2779 | */ | |
2780 | void uart_handle_cts_change(struct uart_port *uport, unsigned int status) | |
2781 | { | |
2782 | struct tty_port *port = &uport->state->port; | |
2783 | struct tty_struct *tty = port->tty; | |
2784 | ||
2785 | uport->icount.cts++; | |
2786 | ||
06aa82e4 MK |
2787 | /* skip below code if the hw flow control is supported */ |
2788 | if (tty_port_cts_enabled(port) && | |
2789 | !(uport->flags & UPF_HARD_FLOW)) { | |
027d7dac JS |
2790 | if (tty->hw_stopped) { |
2791 | if (status) { | |
2792 | tty->hw_stopped = 0; | |
2793 | uport->ops->start_tx(uport); | |
2794 | uart_write_wakeup(uport); | |
2795 | } | |
2796 | } else { | |
2797 | if (!status) { | |
2798 | tty->hw_stopped = 1; | |
2799 | uport->ops->stop_tx(uport); | |
2800 | } | |
2801 | } | |
2802 | } | |
2803 | } | |
2804 | EXPORT_SYMBOL_GPL(uart_handle_cts_change); | |
2805 | ||
cf75525f JS |
2806 | /** |
2807 | * uart_insert_char - push a char to the uart layer | |
2808 | * | |
2809 | * User is responsible to call tty_flip_buffer_push when they are done with | |
2810 | * insertion. | |
2811 | * | |
2812 | * @port: corresponding port | |
2813 | * @status: state of the serial port RX buffer (LSR for 8250) | |
2814 | * @overrun: mask of overrun bits in @status | |
2815 | * @ch: character to push | |
2816 | * @flag: flag for the character (see TTY_NORMAL and friends) | |
2817 | */ | |
027d7dac JS |
2818 | void uart_insert_char(struct uart_port *port, unsigned int status, |
2819 | unsigned int overrun, unsigned int ch, unsigned int flag) | |
2820 | { | |
92a19f9c | 2821 | struct tty_port *tport = &port->state->port; |
027d7dac JS |
2822 | |
2823 | if ((status & port->ignore_status_mask & ~overrun) == 0) | |
92a19f9c | 2824 | if (tty_insert_flip_char(tport, ch, flag) == 0) |
dabfb351 | 2825 | ++port->icount.buf_overrun; |
027d7dac JS |
2826 | |
2827 | /* | |
2828 | * Overrun is special. Since it's reported immediately, | |
2829 | * it doesn't affect the current character. | |
2830 | */ | |
2831 | if (status & ~port->ignore_status_mask & overrun) | |
92a19f9c | 2832 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) |
dabfb351 | 2833 | ++port->icount.buf_overrun; |
027d7dac JS |
2834 | } |
2835 | EXPORT_SYMBOL_GPL(uart_insert_char); | |
2836 | ||
1da177e4 LT |
2837 | EXPORT_SYMBOL(uart_write_wakeup); |
2838 | EXPORT_SYMBOL(uart_register_driver); | |
2839 | EXPORT_SYMBOL(uart_unregister_driver); | |
2840 | EXPORT_SYMBOL(uart_suspend_port); | |
2841 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2842 | EXPORT_SYMBOL(uart_add_one_port); |
2843 | EXPORT_SYMBOL(uart_remove_one_port); | |
2844 | ||
2845 | MODULE_DESCRIPTION("Serial driver core"); | |
2846 | MODULE_LICENSE("GPL"); |