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> | |
a208ffd2 | 29 | #include <linux/of.h> |
d196a949 AD |
30 | #include <linux/proc_fs.h> |
31 | #include <linux/seq_file.h> | |
1da177e4 LT |
32 | #include <linux/device.h> |
33 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ | |
ccce6deb | 34 | #include <linux/serial_core.h> |
1da177e4 | 35 | #include <linux/delay.h> |
f392ecfa | 36 | #include <linux/mutex.h> |
1da177e4 LT |
37 | |
38 | #include <asm/irq.h> | |
39 | #include <asm/uaccess.h> | |
40 | ||
1da177e4 LT |
41 | /* |
42 | * This is used to lock changes in serial line configuration. | |
43 | */ | |
f392ecfa | 44 | static DEFINE_MUTEX(port_mutex); |
1da177e4 | 45 | |
13e83599 IM |
46 | /* |
47 | * lockdep: port->lock is initialized in two places, but we | |
48 | * want only one lock-class: | |
49 | */ | |
50 | static struct lock_class_key port_lock_key; | |
51 | ||
1da177e4 LT |
52 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
53 | ||
19225135 | 54 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
a46c9994 | 55 | struct ktermios *old_termios); |
1f33a51d | 56 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
6f538fe3 LW |
57 | static void uart_change_pm(struct uart_state *state, |
58 | enum uart_pm_state pm_state); | |
1da177e4 | 59 | |
b922e19d JS |
60 | static void uart_port_shutdown(struct tty_port *port); |
61 | ||
1da177e4 LT |
62 | /* |
63 | * This routine is used by the interrupt handler to schedule processing in | |
64 | * the software interrupt portion of the driver. | |
65 | */ | |
66 | void uart_write_wakeup(struct uart_port *port) | |
67 | { | |
ebd2c8f6 | 68 | struct uart_state *state = port->state; |
d5f735e5 PM |
69 | /* |
70 | * This means you called this function _after_ the port was | |
71 | * closed. No cookie for you. | |
72 | */ | |
ebd2c8f6 | 73 | BUG_ON(!state); |
6a3e492b | 74 | tty_wakeup(state->port.tty); |
1da177e4 LT |
75 | } |
76 | ||
77 | static void uart_stop(struct tty_struct *tty) | |
78 | { | |
79 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 80 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
81 | unsigned long flags; |
82 | ||
83 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 84 | port->ops->stop_tx(port); |
1da177e4 LT |
85 | spin_unlock_irqrestore(&port->lock, flags); |
86 | } | |
87 | ||
88 | static void __uart_start(struct tty_struct *tty) | |
89 | { | |
90 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 91 | struct uart_port *port = state->uart_port; |
1da177e4 | 92 | |
717f3bba | 93 | if (!tty->stopped && !tty->hw_stopped) |
b129a8cc | 94 | port->ops->start_tx(port); |
1da177e4 LT |
95 | } |
96 | ||
97 | static void uart_start(struct tty_struct *tty) | |
98 | { | |
99 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 100 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
101 | unsigned long flags; |
102 | ||
103 | spin_lock_irqsave(&port->lock, flags); | |
104 | __uart_start(tty); | |
105 | spin_unlock_irqrestore(&port->lock, flags); | |
106 | } | |
107 | ||
1da177e4 LT |
108 | static inline void |
109 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) | |
110 | { | |
111 | unsigned long flags; | |
112 | unsigned int old; | |
113 | ||
114 | spin_lock_irqsave(&port->lock, flags); | |
115 | old = port->mctrl; | |
116 | port->mctrl = (old & ~clear) | set; | |
117 | if (old != port->mctrl) | |
118 | port->ops->set_mctrl(port, port->mctrl); | |
119 | spin_unlock_irqrestore(&port->lock, flags); | |
120 | } | |
121 | ||
a46c9994 AC |
122 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
123 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) | |
1da177e4 LT |
124 | |
125 | /* | |
126 | * Startup the port. This will be called once per open. All calls | |
df4f4dd4 | 127 | * will be serialised by the per-port mutex. |
1da177e4 | 128 | */ |
c0d92be6 JS |
129 | static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, |
130 | int init_hw) | |
1da177e4 | 131 | { |
46d57a44 AC |
132 | struct uart_port *uport = state->uart_port; |
133 | struct tty_port *port = &state->port; | |
1da177e4 LT |
134 | unsigned long page; |
135 | int retval = 0; | |
136 | ||
46d57a44 | 137 | if (uport->type == PORT_UNKNOWN) |
c0d92be6 | 138 | return 1; |
1da177e4 | 139 | |
7deb39ed TP |
140 | /* |
141 | * Make sure the device is in D0 state. | |
142 | */ | |
143 | uart_change_pm(state, UART_PM_STATE_ON); | |
144 | ||
1da177e4 LT |
145 | /* |
146 | * Initialise and allocate the transmit and temporary | |
147 | * buffer. | |
148 | */ | |
ebd2c8f6 | 149 | if (!state->xmit.buf) { |
df4f4dd4 | 150 | /* This is protected by the per port mutex */ |
1da177e4 LT |
151 | page = get_zeroed_page(GFP_KERNEL); |
152 | if (!page) | |
153 | return -ENOMEM; | |
154 | ||
ebd2c8f6 AC |
155 | state->xmit.buf = (unsigned char *) page; |
156 | uart_circ_clear(&state->xmit); | |
1da177e4 LT |
157 | } |
158 | ||
46d57a44 | 159 | retval = uport->ops->startup(uport); |
1da177e4 | 160 | if (retval == 0) { |
c7d7abff | 161 | if (uart_console(uport) && uport->cons->cflag) { |
adc8d746 | 162 | tty->termios.c_cflag = uport->cons->cflag; |
c7d7abff JS |
163 | uport->cons->cflag = 0; |
164 | } | |
165 | /* | |
166 | * Initialise the hardware port settings. | |
167 | */ | |
168 | uart_change_speed(tty, state, NULL); | |
1da177e4 | 169 | |
c7d7abff | 170 | if (init_hw) { |
1da177e4 LT |
171 | /* |
172 | * Setup the RTS and DTR signals once the | |
173 | * port is open and ready to respond. | |
174 | */ | |
adc8d746 | 175 | if (tty->termios.c_cflag & CBAUD) |
46d57a44 | 176 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 177 | } |
06aa82e4 MK |
178 | /* |
179 | * if hw support flow control without software intervention, | |
180 | * then skip the below check | |
181 | */ | |
182 | if (tty_port_cts_enabled(port) && | |
183 | !(uport->flags & UPF_HARD_FLOW)) { | |
46d57a44 AC |
184 | spin_lock_irq(&uport->lock); |
185 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) | |
19225135 | 186 | tty->hw_stopped = 1; |
46d57a44 | 187 | spin_unlock_irq(&uport->lock); |
0dd7a1ae | 188 | } |
1da177e4 LT |
189 | } |
190 | ||
0055197e JS |
191 | /* |
192 | * This is to allow setserial on this port. People may want to set | |
193 | * port/irq/type and then reconfigure the port properly if it failed | |
194 | * now. | |
195 | */ | |
1da177e4 | 196 | if (retval && capable(CAP_SYS_ADMIN)) |
c0d92be6 JS |
197 | return 1; |
198 | ||
199 | return retval; | |
200 | } | |
201 | ||
202 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, | |
203 | int init_hw) | |
204 | { | |
205 | struct tty_port *port = &state->port; | |
206 | int retval; | |
207 | ||
208 | if (port->flags & ASYNC_INITIALIZED) | |
209 | return 0; | |
210 | ||
211 | /* | |
212 | * Set the TTY IO error marker - we will only clear this | |
213 | * once we have successfully opened the port. | |
214 | */ | |
215 | set_bit(TTY_IO_ERROR, &tty->flags); | |
216 | ||
217 | retval = uart_port_startup(tty, state, init_hw); | |
218 | if (!retval) { | |
219 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
220 | clear_bit(TTY_IO_ERROR, &tty->flags); | |
221 | } else if (retval > 0) | |
1da177e4 LT |
222 | retval = 0; |
223 | ||
224 | return retval; | |
225 | } | |
226 | ||
227 | /* | |
228 | * This routine will shutdown a serial port; interrupts are disabled, and | |
229 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
230 | * uart_shutdown are serialised by the per-port semaphore. | |
231 | */ | |
19225135 | 232 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
1da177e4 | 233 | { |
ccce6deb | 234 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 235 | struct tty_port *port = &state->port; |
1da177e4 | 236 | |
1da177e4 | 237 | /* |
ee31b337 | 238 | * Set the TTY IO error marker |
1da177e4 | 239 | */ |
f751928e AC |
240 | if (tty) |
241 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 242 | |
bdc04e31 | 243 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
ee31b337 RK |
244 | /* |
245 | * Turn off DTR and RTS early. | |
246 | */ | |
ae84db96 PH |
247 | if (uart_console(uport) && tty) |
248 | uport->cons->cflag = tty->termios.c_cflag; | |
249 | ||
adc8d746 | 250 | if (!tty || (tty->termios.c_cflag & HUPCL)) |
ccce6deb | 251 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
ee31b337 | 252 | |
b922e19d | 253 | uart_port_shutdown(port); |
ee31b337 | 254 | } |
1da177e4 LT |
255 | |
256 | /* | |
d208a3bf DA |
257 | * It's possible for shutdown to be called after suspend if we get |
258 | * a DCD drop (hangup) at just the right time. Clear suspended bit so | |
259 | * we don't try to resume a port that has been shutdown. | |
1da177e4 | 260 | */ |
d208a3bf | 261 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
262 | |
263 | /* | |
264 | * Free the transmit buffer page. | |
265 | */ | |
ebd2c8f6 AC |
266 | if (state->xmit.buf) { |
267 | free_page((unsigned long)state->xmit.buf); | |
268 | state->xmit.buf = NULL; | |
1da177e4 | 269 | } |
1da177e4 LT |
270 | } |
271 | ||
272 | /** | |
273 | * uart_update_timeout - update per-port FIFO timeout. | |
274 | * @port: uart_port structure describing the port | |
275 | * @cflag: termios cflag value | |
276 | * @baud: speed of the port | |
277 | * | |
278 | * Set the port FIFO timeout value. The @cflag value should | |
279 | * reflect the actual hardware settings. | |
280 | */ | |
281 | void | |
282 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
283 | unsigned int baud) | |
284 | { | |
285 | unsigned int bits; | |
286 | ||
287 | /* byte size and parity */ | |
288 | switch (cflag & CSIZE) { | |
289 | case CS5: | |
290 | bits = 7; | |
291 | break; | |
292 | case CS6: | |
293 | bits = 8; | |
294 | break; | |
295 | case CS7: | |
296 | bits = 9; | |
297 | break; | |
298 | default: | |
299 | bits = 10; | |
a46c9994 | 300 | break; /* CS8 */ |
1da177e4 LT |
301 | } |
302 | ||
303 | if (cflag & CSTOPB) | |
304 | bits++; | |
305 | if (cflag & PARENB) | |
306 | bits++; | |
307 | ||
308 | /* | |
309 | * The total number of bits to be transmitted in the fifo. | |
310 | */ | |
311 | bits = bits * port->fifosize; | |
312 | ||
313 | /* | |
314 | * Figure the timeout to send the above number of bits. | |
315 | * Add .02 seconds of slop | |
316 | */ | |
317 | port->timeout = (HZ * bits) / baud + HZ/50; | |
318 | } | |
319 | ||
320 | EXPORT_SYMBOL(uart_update_timeout); | |
321 | ||
322 | /** | |
323 | * uart_get_baud_rate - return baud rate for a particular port | |
324 | * @port: uart_port structure describing the port in question. | |
325 | * @termios: desired termios settings. | |
326 | * @old: old termios (or NULL) | |
327 | * @min: minimum acceptable baud rate | |
328 | * @max: maximum acceptable baud rate | |
329 | * | |
330 | * Decode the termios structure into a numeric baud rate, | |
331 | * taking account of the magic 38400 baud rate (with spd_* | |
332 | * flags), and mapping the %B0 rate to 9600 baud. | |
333 | * | |
334 | * If the new baud rate is invalid, try the old termios setting. | |
335 | * If it's still invalid, we try 9600 baud. | |
336 | * | |
337 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
338 | * we're actually going to be using. Don't do this for the case |
339 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
340 | */ |
341 | unsigned int | |
606d099c AC |
342 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
343 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
344 | { |
345 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 346 | int hung_up = 0; |
0077d45e | 347 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
348 | |
349 | if (flags == UPF_SPD_HI) | |
350 | altbaud = 57600; | |
82cb7ba1 | 351 | else if (flags == UPF_SPD_VHI) |
1da177e4 | 352 | altbaud = 115200; |
82cb7ba1 | 353 | else if (flags == UPF_SPD_SHI) |
1da177e4 | 354 | altbaud = 230400; |
82cb7ba1 | 355 | else if (flags == UPF_SPD_WARP) |
1da177e4 LT |
356 | altbaud = 460800; |
357 | ||
358 | for (try = 0; try < 2; try++) { | |
359 | baud = tty_termios_baud_rate(termios); | |
360 | ||
361 | /* | |
362 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
363 | * Die! Die! Die! | |
364 | */ | |
365 | if (baud == 38400) | |
366 | baud = altbaud; | |
367 | ||
368 | /* | |
369 | * Special case: B0 rate. | |
370 | */ | |
eb424fd2 AC |
371 | if (baud == 0) { |
372 | hung_up = 1; | |
1da177e4 | 373 | baud = 9600; |
eb424fd2 | 374 | } |
1da177e4 LT |
375 | |
376 | if (baud >= min && baud <= max) | |
377 | return baud; | |
378 | ||
379 | /* | |
380 | * Oops, the quotient was zero. Try again with | |
381 | * the old baud rate if possible. | |
382 | */ | |
383 | termios->c_cflag &= ~CBAUD; | |
384 | if (old) { | |
6d4d67be | 385 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
386 | if (!hung_up) |
387 | tty_termios_encode_baud_rate(termios, | |
388 | baud, baud); | |
1da177e4 LT |
389 | old = NULL; |
390 | continue; | |
391 | } | |
392 | ||
393 | /* | |
16ae2a87 AC |
394 | * As a last resort, if the range cannot be met then clip to |
395 | * the nearest chip supported rate. | |
1da177e4 | 396 | */ |
16ae2a87 AC |
397 | if (!hung_up) { |
398 | if (baud <= min) | |
399 | tty_termios_encode_baud_rate(termios, | |
400 | min + 1, min + 1); | |
401 | else | |
402 | tty_termios_encode_baud_rate(termios, | |
403 | max - 1, max - 1); | |
404 | } | |
1da177e4 | 405 | } |
16ae2a87 AC |
406 | /* Should never happen */ |
407 | WARN_ON(1); | |
1da177e4 LT |
408 | return 0; |
409 | } | |
410 | ||
411 | EXPORT_SYMBOL(uart_get_baud_rate); | |
412 | ||
413 | /** | |
414 | * uart_get_divisor - return uart clock divisor | |
415 | * @port: uart_port structure describing the port. | |
416 | * @baud: desired baud rate | |
417 | * | |
418 | * Calculate the uart clock divisor for the port. | |
419 | */ | |
420 | unsigned int | |
421 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
422 | { | |
423 | unsigned int quot; | |
424 | ||
425 | /* | |
426 | * Old custom speed handling. | |
427 | */ | |
428 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
429 | quot = port->custom_divisor; | |
430 | else | |
97d24634 | 431 | quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); |
1da177e4 LT |
432 | |
433 | return quot; | |
434 | } | |
435 | ||
436 | EXPORT_SYMBOL(uart_get_divisor); | |
437 | ||
23d22cea | 438 | /* FIXME: Consistent locking policy */ |
19225135 AC |
439 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
440 | struct ktermios *old_termios) | |
1da177e4 | 441 | { |
ccce6deb | 442 | struct tty_port *port = &state->port; |
ccce6deb | 443 | struct uart_port *uport = state->uart_port; |
606d099c | 444 | struct ktermios *termios; |
1da177e4 LT |
445 | |
446 | /* | |
447 | * If we have no tty, termios, or the port does not exist, | |
448 | * then we can't set the parameters for this port. | |
449 | */ | |
adc8d746 | 450 | if (!tty || uport->type == PORT_UNKNOWN) |
1da177e4 LT |
451 | return; |
452 | ||
adc8d746 | 453 | termios = &tty->termios; |
c18b55fd | 454 | uport->ops->set_termios(uport, termios, old_termios); |
1da177e4 LT |
455 | |
456 | /* | |
457 | * Set flags based on termios cflag | |
458 | */ | |
459 | if (termios->c_cflag & CRTSCTS) | |
ccce6deb | 460 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 | 461 | else |
ccce6deb | 462 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 LT |
463 | |
464 | if (termios->c_cflag & CLOCAL) | |
ccce6deb | 465 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 466 | else |
ccce6deb | 467 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 LT |
468 | } |
469 | ||
19225135 AC |
470 | static inline int __uart_put_char(struct uart_port *port, |
471 | struct circ_buf *circ, unsigned char c) | |
1da177e4 LT |
472 | { |
473 | unsigned long flags; | |
23d22cea | 474 | int ret = 0; |
1da177e4 LT |
475 | |
476 | if (!circ->buf) | |
23d22cea | 477 | return 0; |
1da177e4 LT |
478 | |
479 | spin_lock_irqsave(&port->lock, flags); | |
480 | if (uart_circ_chars_free(circ) != 0) { | |
481 | circ->buf[circ->head] = c; | |
482 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 483 | ret = 1; |
1da177e4 LT |
484 | } |
485 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 486 | return ret; |
1da177e4 LT |
487 | } |
488 | ||
23d22cea | 489 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
490 | { |
491 | struct uart_state *state = tty->driver_data; | |
492 | ||
ebd2c8f6 | 493 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
1da177e4 LT |
494 | } |
495 | ||
496 | static void uart_flush_chars(struct tty_struct *tty) | |
497 | { | |
498 | uart_start(tty); | |
499 | } | |
500 | ||
19225135 AC |
501 | static int uart_write(struct tty_struct *tty, |
502 | const unsigned char *buf, int count) | |
1da177e4 LT |
503 | { |
504 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
505 | struct uart_port *port; |
506 | struct circ_buf *circ; | |
1da177e4 LT |
507 | unsigned long flags; |
508 | int c, ret = 0; | |
509 | ||
d5f735e5 PM |
510 | /* |
511 | * This means you called this function _after_ the port was | |
512 | * closed. No cookie for you. | |
513 | */ | |
f751928e | 514 | if (!state) { |
d5f735e5 PM |
515 | WARN_ON(1); |
516 | return -EL3HLT; | |
517 | } | |
518 | ||
ebd2c8f6 AC |
519 | port = state->uart_port; |
520 | circ = &state->xmit; | |
d5f735e5 | 521 | |
1da177e4 LT |
522 | if (!circ->buf) |
523 | return 0; | |
524 | ||
525 | spin_lock_irqsave(&port->lock, flags); | |
526 | while (1) { | |
527 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
528 | if (count < c) | |
529 | c = count; | |
530 | if (c <= 0) | |
531 | break; | |
532 | memcpy(circ->buf + circ->head, buf, c); | |
533 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
534 | buf += c; | |
535 | count -= c; | |
536 | ret += c; | |
537 | } | |
538 | spin_unlock_irqrestore(&port->lock, flags); | |
539 | ||
540 | uart_start(tty); | |
541 | return ret; | |
542 | } | |
543 | ||
544 | static int uart_write_room(struct tty_struct *tty) | |
545 | { | |
546 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
547 | unsigned long flags; |
548 | int ret; | |
1da177e4 | 549 | |
ebd2c8f6 AC |
550 | spin_lock_irqsave(&state->uart_port->lock, flags); |
551 | ret = uart_circ_chars_free(&state->xmit); | |
552 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 553 | return ret; |
1da177e4 LT |
554 | } |
555 | ||
556 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
557 | { | |
558 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
559 | unsigned long flags; |
560 | int ret; | |
1da177e4 | 561 | |
ebd2c8f6 AC |
562 | spin_lock_irqsave(&state->uart_port->lock, flags); |
563 | ret = uart_circ_chars_pending(&state->xmit); | |
564 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 565 | return ret; |
1da177e4 LT |
566 | } |
567 | ||
568 | static void uart_flush_buffer(struct tty_struct *tty) | |
569 | { | |
570 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 571 | struct uart_port *port; |
1da177e4 LT |
572 | unsigned long flags; |
573 | ||
d5f735e5 PM |
574 | /* |
575 | * This means you called this function _after_ the port was | |
576 | * closed. No cookie for you. | |
577 | */ | |
f751928e | 578 | if (!state) { |
d5f735e5 PM |
579 | WARN_ON(1); |
580 | return; | |
581 | } | |
582 | ||
ebd2c8f6 | 583 | port = state->uart_port; |
eb3a1e11 | 584 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
585 | |
586 | spin_lock_irqsave(&port->lock, flags); | |
ebd2c8f6 | 587 | uart_circ_clear(&state->xmit); |
6bb0e3a5 HS |
588 | if (port->ops->flush_buffer) |
589 | port->ops->flush_buffer(port); | |
1da177e4 LT |
590 | spin_unlock_irqrestore(&port->lock, flags); |
591 | tty_wakeup(tty); | |
592 | } | |
593 | ||
594 | /* | |
595 | * This function is used to send a high-priority XON/XOFF character to | |
596 | * the device | |
597 | */ | |
598 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
599 | { | |
600 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 601 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
602 | unsigned long flags; |
603 | ||
604 | if (port->ops->send_xchar) | |
605 | port->ops->send_xchar(port, ch); | |
606 | else { | |
607 | port->x_char = ch; | |
608 | if (ch) { | |
609 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 610 | port->ops->start_tx(port); |
1da177e4 LT |
611 | spin_unlock_irqrestore(&port->lock, flags); |
612 | } | |
613 | } | |
614 | } | |
615 | ||
616 | static void uart_throttle(struct tty_struct *tty) | |
617 | { | |
618 | struct uart_state *state = tty->driver_data; | |
9aba8d5b RK |
619 | struct uart_port *port = state->uart_port; |
620 | uint32_t mask = 0; | |
1da177e4 LT |
621 | |
622 | if (I_IXOFF(tty)) | |
9aba8d5b RK |
623 | mask |= UPF_SOFT_FLOW; |
624 | if (tty->termios.c_cflag & CRTSCTS) | |
625 | mask |= UPF_HARD_FLOW; | |
626 | ||
627 | if (port->flags & mask) { | |
628 | port->ops->throttle(port); | |
629 | mask &= ~port->flags; | |
630 | } | |
631 | ||
632 | if (mask & UPF_SOFT_FLOW) | |
1da177e4 LT |
633 | uart_send_xchar(tty, STOP_CHAR(tty)); |
634 | ||
9aba8d5b RK |
635 | if (mask & UPF_HARD_FLOW) |
636 | uart_clear_mctrl(port, TIOCM_RTS); | |
1da177e4 LT |
637 | } |
638 | ||
639 | static void uart_unthrottle(struct tty_struct *tty) | |
640 | { | |
641 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 642 | struct uart_port *port = state->uart_port; |
9aba8d5b | 643 | uint32_t mask = 0; |
1da177e4 | 644 | |
9aba8d5b RK |
645 | if (I_IXOFF(tty)) |
646 | mask |= UPF_SOFT_FLOW; | |
647 | if (tty->termios.c_cflag & CRTSCTS) | |
648 | mask |= UPF_HARD_FLOW; | |
649 | ||
650 | if (port->flags & mask) { | |
651 | port->ops->unthrottle(port); | |
652 | mask &= ~port->flags; | |
653 | } | |
1da177e4 | 654 | |
9aba8d5b | 655 | if (mask & UPF_SOFT_FLOW) { |
1da177e4 LT |
656 | if (port->x_char) |
657 | port->x_char = 0; | |
658 | else | |
659 | uart_send_xchar(tty, START_CHAR(tty)); | |
660 | } | |
661 | ||
9aba8d5b | 662 | if (mask & UPF_HARD_FLOW) |
1da177e4 LT |
663 | uart_set_mctrl(port, TIOCM_RTS); |
664 | } | |
665 | ||
9f109694 | 666 | static void do_uart_get_info(struct tty_port *port, |
7ba2e769 | 667 | struct serial_struct *retinfo) |
1da177e4 | 668 | { |
9f109694 | 669 | struct uart_state *state = container_of(port, struct uart_state, port); |
a2bceae0 | 670 | struct uart_port *uport = state->uart_port; |
f34d7a5b | 671 | |
37cd0c99 | 672 | memset(retinfo, 0, sizeof(*retinfo)); |
f34d7a5b | 673 | |
7ba2e769 AC |
674 | retinfo->type = uport->type; |
675 | retinfo->line = uport->line; | |
676 | retinfo->port = uport->iobase; | |
1da177e4 | 677 | if (HIGH_BITS_OFFSET) |
7ba2e769 AC |
678 | retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
679 | retinfo->irq = uport->irq; | |
680 | retinfo->flags = uport->flags; | |
681 | retinfo->xmit_fifo_size = uport->fifosize; | |
682 | retinfo->baud_base = uport->uartclk / 16; | |
683 | retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; | |
684 | retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
1da177e4 | 685 | ASYNC_CLOSING_WAIT_NONE : |
4cb0fbfd | 686 | jiffies_to_msecs(port->closing_wait) / 10; |
7ba2e769 AC |
687 | retinfo->custom_divisor = uport->custom_divisor; |
688 | retinfo->hub6 = uport->hub6; | |
689 | retinfo->io_type = uport->iotype; | |
690 | retinfo->iomem_reg_shift = uport->regshift; | |
691 | retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; | |
692 | } | |
693 | ||
9f109694 AC |
694 | static void uart_get_info(struct tty_port *port, |
695 | struct serial_struct *retinfo) | |
7ba2e769 | 696 | { |
7ba2e769 AC |
697 | /* Ensure the state we copy is consistent and no hardware changes |
698 | occur as we go */ | |
699 | mutex_lock(&port->mutex); | |
9f109694 | 700 | do_uart_get_info(port, retinfo); |
a2bceae0 | 701 | mutex_unlock(&port->mutex); |
9f109694 AC |
702 | } |
703 | ||
704 | static int uart_get_info_user(struct tty_port *port, | |
705 | struct serial_struct __user *retinfo) | |
706 | { | |
707 | struct serial_struct tmp; | |
708 | uart_get_info(port, &tmp); | |
f34d7a5b | 709 | |
1da177e4 LT |
710 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
711 | return -EFAULT; | |
712 | return 0; | |
713 | } | |
714 | ||
7ba2e769 AC |
715 | static int uart_set_info(struct tty_struct *tty, struct tty_port *port, |
716 | struct uart_state *state, | |
717 | struct serial_struct *new_info) | |
1da177e4 | 718 | { |
46d57a44 | 719 | struct uart_port *uport = state->uart_port; |
1da177e4 | 720 | unsigned long new_port; |
0077d45e | 721 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 722 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 723 | upf_t old_flags, new_flags; |
1da177e4 LT |
724 | int retval = 0; |
725 | ||
7ba2e769 | 726 | new_port = new_info->port; |
1da177e4 | 727 | if (HIGH_BITS_OFFSET) |
7ba2e769 | 728 | new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; |
1da177e4 | 729 | |
7ba2e769 AC |
730 | new_info->irq = irq_canonicalize(new_info->irq); |
731 | close_delay = msecs_to_jiffies(new_info->close_delay * 10); | |
732 | closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
4cb0fbfd | 733 | ASYNC_CLOSING_WAIT_NONE : |
7ba2e769 | 734 | msecs_to_jiffies(new_info->closing_wait * 10); |
1da177e4 | 735 | |
1da177e4 | 736 | |
46d57a44 | 737 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
7ba2e769 | 738 | && new_info->irq != uport->irq; |
1da177e4 LT |
739 | |
740 | /* | |
741 | * Since changing the 'type' of the port changes its resource | |
742 | * allocations, we should treat type changes the same as | |
743 | * IO port changes. | |
744 | */ | |
46d57a44 AC |
745 | change_port = !(uport->flags & UPF_FIXED_PORT) |
746 | && (new_port != uport->iobase || | |
7ba2e769 AC |
747 | (unsigned long)new_info->iomem_base != uport->mapbase || |
748 | new_info->hub6 != uport->hub6 || | |
749 | new_info->io_type != uport->iotype || | |
750 | new_info->iomem_reg_shift != uport->regshift || | |
751 | new_info->type != uport->type); | |
46d57a44 AC |
752 | |
753 | old_flags = uport->flags; | |
7ba2e769 | 754 | new_flags = new_info->flags; |
46d57a44 | 755 | old_custom_divisor = uport->custom_divisor; |
1da177e4 LT |
756 | |
757 | if (!capable(CAP_SYS_ADMIN)) { | |
758 | retval = -EPERM; | |
759 | if (change_irq || change_port || | |
7ba2e769 | 760 | (new_info->baud_base != uport->uartclk / 16) || |
46d57a44 AC |
761 | (close_delay != port->close_delay) || |
762 | (closing_wait != port->closing_wait) || | |
7ba2e769 AC |
763 | (new_info->xmit_fifo_size && |
764 | new_info->xmit_fifo_size != uport->fifosize) || | |
0077d45e | 765 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 | 766 | goto exit; |
46d57a44 | 767 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
0077d45e | 768 | (new_flags & UPF_USR_MASK)); |
7ba2e769 | 769 | uport->custom_divisor = new_info->custom_divisor; |
1da177e4 LT |
770 | goto check_and_exit; |
771 | } | |
772 | ||
773 | /* | |
774 | * Ask the low level driver to verify the settings. | |
775 | */ | |
46d57a44 | 776 | if (uport->ops->verify_port) |
7ba2e769 | 777 | retval = uport->ops->verify_port(uport, new_info); |
1da177e4 | 778 | |
7ba2e769 AC |
779 | if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || |
780 | (new_info->baud_base < 9600)) | |
1da177e4 LT |
781 | retval = -EINVAL; |
782 | ||
783 | if (retval) | |
784 | goto exit; | |
785 | ||
786 | if (change_port || change_irq) { | |
787 | retval = -EBUSY; | |
788 | ||
789 | /* | |
790 | * Make sure that we are the sole user of this port. | |
791 | */ | |
b58d13a0 | 792 | if (tty_port_users(port) > 1) |
1da177e4 LT |
793 | goto exit; |
794 | ||
795 | /* | |
796 | * We need to shutdown the serial port at the old | |
797 | * port/type/irq combination. | |
798 | */ | |
19225135 | 799 | uart_shutdown(tty, state); |
1da177e4 LT |
800 | } |
801 | ||
802 | if (change_port) { | |
803 | unsigned long old_iobase, old_mapbase; | |
804 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
805 | ||
46d57a44 AC |
806 | old_iobase = uport->iobase; |
807 | old_mapbase = uport->mapbase; | |
808 | old_type = uport->type; | |
809 | old_hub6 = uport->hub6; | |
810 | old_iotype = uport->iotype; | |
811 | old_shift = uport->regshift; | |
1da177e4 LT |
812 | |
813 | /* | |
814 | * Free and release old regions | |
815 | */ | |
816 | if (old_type != PORT_UNKNOWN) | |
46d57a44 | 817 | uport->ops->release_port(uport); |
1da177e4 | 818 | |
46d57a44 | 819 | uport->iobase = new_port; |
7ba2e769 AC |
820 | uport->type = new_info->type; |
821 | uport->hub6 = new_info->hub6; | |
822 | uport->iotype = new_info->io_type; | |
823 | uport->regshift = new_info->iomem_reg_shift; | |
824 | uport->mapbase = (unsigned long)new_info->iomem_base; | |
1da177e4 LT |
825 | |
826 | /* | |
827 | * Claim and map the new regions | |
828 | */ | |
46d57a44 AC |
829 | if (uport->type != PORT_UNKNOWN) { |
830 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
831 | } else { |
832 | /* Always success - Jean II */ | |
833 | retval = 0; | |
834 | } | |
835 | ||
836 | /* | |
837 | * If we fail to request resources for the | |
838 | * new port, try to restore the old settings. | |
839 | */ | |
7deb39ed | 840 | if (retval) { |
46d57a44 AC |
841 | uport->iobase = old_iobase; |
842 | uport->type = old_type; | |
843 | uport->hub6 = old_hub6; | |
844 | uport->iotype = old_iotype; | |
845 | uport->regshift = old_shift; | |
846 | uport->mapbase = old_mapbase; | |
1da177e4 | 847 | |
7deb39ed TP |
848 | if (old_type != PORT_UNKNOWN) { |
849 | retval = uport->ops->request_port(uport); | |
850 | /* | |
851 | * If we failed to restore the old settings, | |
852 | * we fail like this. | |
853 | */ | |
854 | if (retval) | |
855 | uport->type = PORT_UNKNOWN; | |
856 | ||
857 | /* | |
858 | * We failed anyway. | |
859 | */ | |
860 | retval = -EBUSY; | |
861 | } | |
862 | ||
a46c9994 AC |
863 | /* Added to return the correct error -Ram Gupta */ |
864 | goto exit; | |
1da177e4 LT |
865 | } |
866 | } | |
867 | ||
abb4a239 | 868 | if (change_irq) |
7ba2e769 | 869 | uport->irq = new_info->irq; |
46d57a44 | 870 | if (!(uport->flags & UPF_FIXED_PORT)) |
7ba2e769 | 871 | uport->uartclk = new_info->baud_base * 16; |
46d57a44 | 872 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
0077d45e | 873 | (new_flags & UPF_CHANGE_MASK); |
7ba2e769 | 874 | uport->custom_divisor = new_info->custom_divisor; |
46d57a44 AC |
875 | port->close_delay = close_delay; |
876 | port->closing_wait = closing_wait; | |
7ba2e769 AC |
877 | if (new_info->xmit_fifo_size) |
878 | uport->fifosize = new_info->xmit_fifo_size; | |
d6c53c0e | 879 | port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
880 | |
881 | check_and_exit: | |
882 | retval = 0; | |
46d57a44 | 883 | if (uport->type == PORT_UNKNOWN) |
1da177e4 | 884 | goto exit; |
ccce6deb | 885 | if (port->flags & ASYNC_INITIALIZED) { |
46d57a44 AC |
886 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
887 | old_custom_divisor != uport->custom_divisor) { | |
1da177e4 LT |
888 | /* |
889 | * If they're setting up a custom divisor or speed, | |
890 | * instead of clearing it, then bitch about it. No | |
891 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
892 | */ | |
46d57a44 | 893 | if (uport->flags & UPF_SPD_MASK) { |
1da177e4 LT |
894 | char buf[64]; |
895 | printk(KERN_NOTICE | |
896 | "%s sets custom speed on %s. This " | |
897 | "is deprecated.\n", current->comm, | |
46d57a44 | 898 | tty_name(port->tty, buf)); |
1da177e4 | 899 | } |
19225135 | 900 | uart_change_speed(tty, state, NULL); |
1da177e4 LT |
901 | } |
902 | } else | |
19225135 | 903 | retval = uart_startup(tty, state, 1); |
1da177e4 | 904 | exit: |
7ba2e769 AC |
905 | return retval; |
906 | } | |
907 | ||
908 | static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, | |
909 | struct serial_struct __user *newinfo) | |
910 | { | |
911 | struct serial_struct new_serial; | |
912 | struct tty_port *port = &state->port; | |
913 | int retval; | |
914 | ||
915 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
916 | return -EFAULT; | |
917 | ||
918 | /* | |
919 | * This semaphore protects port->count. It is also | |
920 | * very useful to prevent opens. Also, take the | |
921 | * port configuration semaphore to make sure that a | |
922 | * module insertion/removal doesn't change anything | |
923 | * under us. | |
924 | */ | |
925 | mutex_lock(&port->mutex); | |
926 | retval = uart_set_info(tty, port, state, &new_serial); | |
a2bceae0 | 927 | mutex_unlock(&port->mutex); |
1da177e4 LT |
928 | return retval; |
929 | } | |
930 | ||
19225135 AC |
931 | /** |
932 | * uart_get_lsr_info - get line status register info | |
933 | * @tty: tty associated with the UART | |
934 | * @state: UART being queried | |
935 | * @value: returned modem value | |
936 | * | |
937 | * Note: uart_ioctl protects us against hangups. | |
1da177e4 | 938 | */ |
19225135 AC |
939 | static int uart_get_lsr_info(struct tty_struct *tty, |
940 | struct uart_state *state, unsigned int __user *value) | |
1da177e4 | 941 | { |
46d57a44 | 942 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
943 | unsigned int result; |
944 | ||
46d57a44 | 945 | result = uport->ops->tx_empty(uport); |
1da177e4 LT |
946 | |
947 | /* | |
948 | * If we're about to load something into the transmit | |
949 | * register, we'll pretend the transmitter isn't empty to | |
950 | * avoid a race condition (depending on when the transmit | |
951 | * interrupt happens). | |
952 | */ | |
46d57a44 | 953 | if (uport->x_char || |
ebd2c8f6 | 954 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
19225135 | 955 | !tty->stopped && !tty->hw_stopped)) |
1da177e4 | 956 | result &= ~TIOCSER_TEMT; |
a46c9994 | 957 | |
1da177e4 LT |
958 | return put_user(result, value); |
959 | } | |
960 | ||
60b33c13 | 961 | static int uart_tiocmget(struct tty_struct *tty) |
1da177e4 LT |
962 | { |
963 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 964 | struct tty_port *port = &state->port; |
46d57a44 | 965 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
966 | int result = -EIO; |
967 | ||
a2bceae0 | 968 | mutex_lock(&port->mutex); |
60b33c13 | 969 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 970 | result = uport->mctrl; |
46d57a44 AC |
971 | spin_lock_irq(&uport->lock); |
972 | result |= uport->ops->get_mctrl(uport); | |
973 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 974 | } |
a2bceae0 | 975 | mutex_unlock(&port->mutex); |
1da177e4 LT |
976 | |
977 | return result; | |
978 | } | |
979 | ||
980 | static int | |
20b9d177 | 981 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
1da177e4 LT |
982 | { |
983 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 984 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 985 | struct tty_port *port = &state->port; |
1da177e4 LT |
986 | int ret = -EIO; |
987 | ||
a2bceae0 | 988 | mutex_lock(&port->mutex); |
20b9d177 | 989 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 990 | uart_update_mctrl(uport, set, clear); |
1da177e4 LT |
991 | ret = 0; |
992 | } | |
a2bceae0 | 993 | mutex_unlock(&port->mutex); |
1da177e4 LT |
994 | return ret; |
995 | } | |
996 | ||
9e98966c | 997 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
998 | { |
999 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1000 | struct tty_port *port = &state->port; |
46d57a44 | 1001 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1002 | |
a2bceae0 | 1003 | mutex_lock(&port->mutex); |
1da177e4 | 1004 | |
46d57a44 AC |
1005 | if (uport->type != PORT_UNKNOWN) |
1006 | uport->ops->break_ctl(uport, break_state); | |
1da177e4 | 1007 | |
a2bceae0 | 1008 | mutex_unlock(&port->mutex); |
9e98966c | 1009 | return 0; |
1da177e4 LT |
1010 | } |
1011 | ||
19225135 | 1012 | static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) |
1da177e4 | 1013 | { |
46d57a44 | 1014 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 1015 | struct tty_port *port = &state->port; |
1da177e4 LT |
1016 | int flags, ret; |
1017 | ||
1018 | if (!capable(CAP_SYS_ADMIN)) | |
1019 | return -EPERM; | |
1020 | ||
1021 | /* | |
1022 | * Take the per-port semaphore. This prevents count from | |
1023 | * changing, and hence any extra opens of the port while | |
1024 | * we're auto-configuring. | |
1025 | */ | |
a2bceae0 | 1026 | if (mutex_lock_interruptible(&port->mutex)) |
1da177e4 LT |
1027 | return -ERESTARTSYS; |
1028 | ||
1029 | ret = -EBUSY; | |
b58d13a0 | 1030 | if (tty_port_users(port) == 1) { |
19225135 | 1031 | uart_shutdown(tty, state); |
1da177e4 LT |
1032 | |
1033 | /* | |
1034 | * If we already have a port type configured, | |
1035 | * we must release its resources. | |
1036 | */ | |
46d57a44 AC |
1037 | if (uport->type != PORT_UNKNOWN) |
1038 | uport->ops->release_port(uport); | |
1da177e4 LT |
1039 | |
1040 | flags = UART_CONFIG_TYPE; | |
46d57a44 | 1041 | if (uport->flags & UPF_AUTO_IRQ) |
1da177e4 LT |
1042 | flags |= UART_CONFIG_IRQ; |
1043 | ||
1044 | /* | |
1045 | * This will claim the ports resources if | |
1046 | * a port is found. | |
1047 | */ | |
46d57a44 | 1048 | uport->ops->config_port(uport, flags); |
1da177e4 | 1049 | |
19225135 | 1050 | ret = uart_startup(tty, state, 1); |
1da177e4 | 1051 | } |
a2bceae0 | 1052 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1053 | return ret; |
1054 | } | |
1055 | ||
1fdc3106 AS |
1056 | static void uart_enable_ms(struct uart_port *uport) |
1057 | { | |
1058 | /* | |
1059 | * Force modem status interrupts on | |
1060 | */ | |
1061 | if (uport->ops->enable_ms) | |
1062 | uport->ops->enable_ms(uport); | |
1063 | } | |
1064 | ||
1da177e4 LT |
1065 | /* |
1066 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1067 | * - mask passed in arg for lines of interest | |
1068 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1069 | * Caller should use TIOCGICOUNT to see which one it was | |
bdc04e31 AC |
1070 | * |
1071 | * FIXME: This wants extracting into a common all driver implementation | |
1072 | * of TIOCMWAIT using tty_port. | |
1da177e4 LT |
1073 | */ |
1074 | static int | |
1075 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
1076 | { | |
46d57a44 | 1077 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 1078 | struct tty_port *port = &state->port; |
1da177e4 LT |
1079 | DECLARE_WAITQUEUE(wait, current); |
1080 | struct uart_icount cprev, cnow; | |
1081 | int ret; | |
1082 | ||
1083 | /* | |
1084 | * note the counters on entry | |
1085 | */ | |
46d57a44 AC |
1086 | spin_lock_irq(&uport->lock); |
1087 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); | |
1fdc3106 | 1088 | uart_enable_ms(uport); |
46d57a44 | 1089 | spin_unlock_irq(&uport->lock); |
1da177e4 | 1090 | |
bdc04e31 | 1091 | add_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 | 1092 | for (;;) { |
46d57a44 AC |
1093 | spin_lock_irq(&uport->lock); |
1094 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1095 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1096 | |
1097 | set_current_state(TASK_INTERRUPTIBLE); | |
1098 | ||
1099 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1100 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1101 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1102 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1103 | ret = 0; |
1104 | break; | |
1da177e4 LT |
1105 | } |
1106 | ||
1107 | schedule(); | |
1108 | ||
1109 | /* see if a signal did it */ | |
1110 | if (signal_pending(current)) { | |
1111 | ret = -ERESTARTSYS; | |
1112 | break; | |
1113 | } | |
1114 | ||
1115 | cprev = cnow; | |
1116 | } | |
1117 | ||
1118 | current->state = TASK_RUNNING; | |
bdc04e31 | 1119 | remove_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 LT |
1120 | |
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1126 | * Return: write counters to the user passed counter struct | |
1127 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1128 | * RI where only 0->1 is counted. | |
1129 | */ | |
d281da7f AC |
1130 | static int uart_get_icount(struct tty_struct *tty, |
1131 | struct serial_icounter_struct *icount) | |
1da177e4 | 1132 | { |
d281da7f | 1133 | struct uart_state *state = tty->driver_data; |
1da177e4 | 1134 | struct uart_icount cnow; |
46d57a44 | 1135 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1136 | |
46d57a44 AC |
1137 | spin_lock_irq(&uport->lock); |
1138 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1139 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1140 | |
d281da7f AC |
1141 | icount->cts = cnow.cts; |
1142 | icount->dsr = cnow.dsr; | |
1143 | icount->rng = cnow.rng; | |
1144 | icount->dcd = cnow.dcd; | |
1145 | icount->rx = cnow.rx; | |
1146 | icount->tx = cnow.tx; | |
1147 | icount->frame = cnow.frame; | |
1148 | icount->overrun = cnow.overrun; | |
1149 | icount->parity = cnow.parity; | |
1150 | icount->brk = cnow.brk; | |
1151 | icount->buf_overrun = cnow.buf_overrun; | |
1152 | ||
1153 | return 0; | |
1da177e4 LT |
1154 | } |
1155 | ||
1156 | /* | |
e5238442 | 1157 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1158 | */ |
1159 | static int | |
6caa76b7 | 1160 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, |
1da177e4 LT |
1161 | unsigned long arg) |
1162 | { | |
1163 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1164 | struct tty_port *port = &state->port; |
1da177e4 LT |
1165 | void __user *uarg = (void __user *)arg; |
1166 | int ret = -ENOIOCTLCMD; | |
1167 | ||
1da177e4 LT |
1168 | |
1169 | /* | |
1170 | * These ioctls don't rely on the hardware to be present. | |
1171 | */ | |
1172 | switch (cmd) { | |
1173 | case TIOCGSERIAL: | |
9f109694 | 1174 | ret = uart_get_info_user(port, uarg); |
1da177e4 LT |
1175 | break; |
1176 | ||
1177 | case TIOCSSERIAL: | |
7ba2e769 | 1178 | ret = uart_set_info_user(tty, state, uarg); |
1da177e4 LT |
1179 | break; |
1180 | ||
1181 | case TIOCSERCONFIG: | |
19225135 | 1182 | ret = uart_do_autoconfig(tty, state); |
1da177e4 LT |
1183 | break; |
1184 | ||
1185 | case TIOCSERGWILD: /* obsolete */ | |
1186 | case TIOCSERSWILD: /* obsolete */ | |
1187 | ret = 0; | |
1188 | break; | |
1189 | } | |
1190 | ||
1191 | if (ret != -ENOIOCTLCMD) | |
1192 | goto out; | |
1193 | ||
1194 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1195 | ret = -EIO; | |
1196 | goto out; | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * The following should only be used when hardware is present. | |
1201 | */ | |
1202 | switch (cmd) { | |
1203 | case TIOCMIWAIT: | |
1204 | ret = uart_wait_modem_status(state, arg); | |
1205 | break; | |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | if (ret != -ENOIOCTLCMD) | |
1209 | goto out; | |
1210 | ||
a2bceae0 | 1211 | mutex_lock(&port->mutex); |
1da177e4 | 1212 | |
6caa76b7 | 1213 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
1da177e4 LT |
1214 | ret = -EIO; |
1215 | goto out_up; | |
1216 | } | |
1217 | ||
1218 | /* | |
1219 | * All these rely on hardware being present and need to be | |
1220 | * protected against the tty being hung up. | |
1221 | */ | |
1222 | switch (cmd) { | |
1223 | case TIOCSERGETLSR: /* Get line status register */ | |
19225135 | 1224 | ret = uart_get_lsr_info(tty, state, uarg); |
1da177e4 LT |
1225 | break; |
1226 | ||
1227 | default: { | |
46d57a44 AC |
1228 | struct uart_port *uport = state->uart_port; |
1229 | if (uport->ops->ioctl) | |
1230 | ret = uport->ops->ioctl(uport, cmd, arg); | |
1da177e4 LT |
1231 | break; |
1232 | } | |
1233 | } | |
f34d7a5b | 1234 | out_up: |
a2bceae0 | 1235 | mutex_unlock(&port->mutex); |
f34d7a5b | 1236 | out: |
1da177e4 LT |
1237 | return ret; |
1238 | } | |
1239 | ||
edeb280e | 1240 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1241 | { |
1242 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1243 | struct uart_port *uport = state->uart_port; |
64e9159f | 1244 | |
46d57a44 | 1245 | if (uport->ops->set_ldisc) |
adc8d746 | 1246 | uport->ops->set_ldisc(uport, tty->termios.c_line); |
64e9159f AC |
1247 | } |
1248 | ||
a46c9994 AC |
1249 | static void uart_set_termios(struct tty_struct *tty, |
1250 | struct ktermios *old_termios) | |
1da177e4 LT |
1251 | { |
1252 | struct uart_state *state = tty->driver_data; | |
dec94e70 | 1253 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1254 | unsigned long flags; |
adc8d746 | 1255 | unsigned int cflag = tty->termios.c_cflag; |
2cbacafd RK |
1256 | unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; |
1257 | bool sw_changed = false; | |
1da177e4 | 1258 | |
2cbacafd RK |
1259 | /* |
1260 | * Drivers doing software flow control also need to know | |
1261 | * about changes to these input settings. | |
1262 | */ | |
1263 | if (uport->flags & UPF_SOFT_FLOW) { | |
1264 | iflag_mask |= IXANY|IXON|IXOFF; | |
1265 | sw_changed = | |
1266 | tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || | |
1267 | tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; | |
1268 | } | |
1da177e4 LT |
1269 | |
1270 | /* | |
1271 | * These are the bits that are used to setup various | |
20620d68 DW |
1272 | * flags in the low level driver. We can ignore the Bfoo |
1273 | * bits in c_cflag; c_[io]speed will always be set | |
1274 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 | 1275 | */ |
1da177e4 | 1276 | if ((cflag ^ old_termios->c_cflag) == 0 && |
adc8d746 AC |
1277 | tty->termios.c_ospeed == old_termios->c_ospeed && |
1278 | tty->termios.c_ispeed == old_termios->c_ispeed && | |
2cbacafd RK |
1279 | ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && |
1280 | !sw_changed) { | |
1da177e4 | 1281 | return; |
e5238442 | 1282 | } |
1da177e4 | 1283 | |
19225135 | 1284 | uart_change_speed(tty, state, old_termios); |
c18b55fd PH |
1285 | /* reload cflag from termios; port driver may have overriden flags */ |
1286 | cflag = tty->termios.c_cflag; | |
1da177e4 LT |
1287 | |
1288 | /* Handle transition to B0 status */ | |
1289 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
dec94e70 | 1290 | uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 1291 | /* Handle transition away from B0 status */ |
82cb7ba1 | 1292 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 LT |
1293 | unsigned int mask = TIOCM_DTR; |
1294 | if (!(cflag & CRTSCTS) || | |
1295 | !test_bit(TTY_THROTTLED, &tty->flags)) | |
1296 | mask |= TIOCM_RTS; | |
dec94e70 | 1297 | uart_set_mctrl(uport, mask); |
1da177e4 LT |
1298 | } |
1299 | ||
dba05832 RK |
1300 | /* |
1301 | * If the port is doing h/w assisted flow control, do nothing. | |
1302 | * We assume that tty->hw_stopped has never been set. | |
1303 | */ | |
1304 | if (uport->flags & UPF_HARD_FLOW) | |
1305 | return; | |
1306 | ||
1da177e4 LT |
1307 | /* Handle turning off CRTSCTS */ |
1308 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
dec94e70 | 1309 | spin_lock_irqsave(&uport->lock, flags); |
1da177e4 LT |
1310 | tty->hw_stopped = 0; |
1311 | __uart_start(tty); | |
dec94e70 | 1312 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 | 1313 | } |
0dd7a1ae | 1314 | /* Handle turning on CRTSCTS */ |
82cb7ba1 | 1315 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
dec94e70 RK |
1316 | spin_lock_irqsave(&uport->lock, flags); |
1317 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { | |
0dd7a1ae | 1318 | tty->hw_stopped = 1; |
dec94e70 | 1319 | uport->ops->stop_tx(uport); |
0dd7a1ae | 1320 | } |
dec94e70 | 1321 | spin_unlock_irqrestore(&uport->lock, flags); |
0dd7a1ae | 1322 | } |
1da177e4 LT |
1323 | } |
1324 | ||
1325 | /* | |
ef4f527c KC |
1326 | * Calls to uart_close() are serialised via the tty_lock in |
1327 | * drivers/tty/tty_io.c:tty_release() | |
1328 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1329 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1330 | */ |
1331 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1332 | { | |
1333 | struct uart_state *state = tty->driver_data; | |
46d57a44 AC |
1334 | struct tty_port *port; |
1335 | struct uart_port *uport; | |
61cd8a21 | 1336 | unsigned long flags; |
a46c9994 | 1337 | |
eea7e17e LT |
1338 | if (!state) |
1339 | return; | |
1340 | ||
46d57a44 AC |
1341 | uport = state->uart_port; |
1342 | port = &state->port; | |
1da177e4 | 1343 | |
4ed94cd4 | 1344 | pr_debug("uart_close(%d) called\n", uport ? uport->line : -1); |
1da177e4 | 1345 | |
4ed94cd4 | 1346 | if (!port->count || tty_port_close_start(port, tty, filp) == 0) |
55956216 | 1347 | return; |
1da177e4 LT |
1348 | |
1349 | /* | |
1350 | * At this point, we stop accepting input. To do this, we | |
1351 | * disable the receive line status interrupts. | |
1352 | */ | |
ccce6deb | 1353 | if (port->flags & ASYNC_INITIALIZED) { |
1da177e4 | 1354 | unsigned long flags; |
eea7e17e | 1355 | spin_lock_irqsave(&uport->lock, flags); |
46d57a44 | 1356 | uport->ops->stop_rx(uport); |
eea7e17e | 1357 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 LT |
1358 | /* |
1359 | * Before we drop DTR, make sure the UART transmitter | |
1360 | * has completely drained; this is especially | |
1361 | * important if there is a transmit FIFO! | |
1362 | */ | |
1f33a51d | 1363 | uart_wait_until_sent(tty, uport->timeout); |
1da177e4 LT |
1364 | } |
1365 | ||
bafb0bd2 | 1366 | mutex_lock(&port->mutex); |
19225135 | 1367 | uart_shutdown(tty, state); |
1da177e4 LT |
1368 | uart_flush_buffer(tty); |
1369 | ||
a46c9994 AC |
1370 | tty_ldisc_flush(tty); |
1371 | ||
7b01478f | 1372 | tty_port_tty_set(port, NULL); |
61cd8a21 | 1373 | tty->closing = 0; |
ddc7b758 | 1374 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 1375 | |
46d57a44 | 1376 | if (port->blocked_open) { |
61cd8a21 | 1377 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1378 | if (port->close_delay) |
4cb0fbfd JS |
1379 | msleep_interruptible( |
1380 | jiffies_to_msecs(port->close_delay)); | |
61cd8a21 | 1381 | spin_lock_irqsave(&port->lock, flags); |
46d57a44 | 1382 | } else if (!uart_console(uport)) { |
61cd8a21 | 1383 | spin_unlock_irqrestore(&port->lock, flags); |
6f538fe3 | 1384 | uart_change_pm(state, UART_PM_STATE_OFF); |
61cd8a21 | 1385 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1386 | } |
1387 | ||
1388 | /* | |
1389 | * Wake up anyone trying to open this port. | |
1390 | */ | |
ccce6deb | 1391 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
426929f8 | 1392 | clear_bit(ASYNCB_CLOSING, &port->flags); |
61cd8a21 | 1393 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1394 | wake_up_interruptible(&port->open_wait); |
426929f8 | 1395 | wake_up_interruptible(&port->close_wait); |
1da177e4 | 1396 | |
a2bceae0 | 1397 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1398 | } |
1399 | ||
1f33a51d | 1400 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
1da177e4 | 1401 | { |
1f33a51d JS |
1402 | struct uart_state *state = tty->driver_data; |
1403 | struct uart_port *port = state->uart_port; | |
1da177e4 LT |
1404 | unsigned long char_time, expire; |
1405 | ||
1da177e4 LT |
1406 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1407 | return; | |
1408 | ||
1409 | /* | |
1410 | * Set the check interval to be 1/5 of the estimated time to | |
1411 | * send a single character, and make it at least 1. The check | |
1412 | * interval should also be less than the timeout. | |
1413 | * | |
1414 | * Note: we have to use pretty tight timings here to satisfy | |
1415 | * the NIST-PCTS. | |
1416 | */ | |
1417 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1418 | char_time = char_time / 5; | |
1419 | if (char_time == 0) | |
1420 | char_time = 1; | |
1421 | if (timeout && timeout < char_time) | |
1422 | char_time = timeout; | |
1423 | ||
1424 | /* | |
1425 | * If the transmitter hasn't cleared in twice the approximate | |
1426 | * amount of time to send the entire FIFO, it probably won't | |
1427 | * ever clear. This assumes the UART isn't doing flow | |
1428 | * control, which is currently the case. Hence, if it ever | |
1429 | * takes longer than port->timeout, this is probably due to a | |
1430 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1431 | * 2*port->timeout. | |
1432 | */ | |
1433 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1434 | timeout = 2 * port->timeout; | |
1435 | ||
1436 | expire = jiffies + timeout; | |
1437 | ||
eb3a1e11 | 1438 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1439 | port->line, jiffies, expire); |
1da177e4 LT |
1440 | |
1441 | /* | |
1442 | * Check whether the transmitter is empty every 'char_time'. | |
1443 | * 'timeout' / 'expire' give us the maximum amount of time | |
1444 | * we wait. | |
1445 | */ | |
1446 | while (!port->ops->tx_empty(port)) { | |
1447 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1448 | if (signal_pending(current)) | |
1449 | break; | |
1450 | if (time_after(jiffies, expire)) | |
1451 | break; | |
1452 | } | |
20365219 AB |
1453 | } |
1454 | ||
1da177e4 | 1455 | /* |
ef4f527c KC |
1456 | * Calls to uart_hangup() are serialised by the tty_lock in |
1457 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1458 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1459 | */ |
1460 | static void uart_hangup(struct tty_struct *tty) | |
1461 | { | |
1462 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1463 | struct tty_port *port = &state->port; |
61cd8a21 | 1464 | unsigned long flags; |
1da177e4 | 1465 | |
ebd2c8f6 | 1466 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
1da177e4 | 1467 | |
a2bceae0 | 1468 | mutex_lock(&port->mutex); |
ccce6deb | 1469 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
1da177e4 | 1470 | uart_flush_buffer(tty); |
19225135 | 1471 | uart_shutdown(tty, state); |
61cd8a21 | 1472 | spin_lock_irqsave(&port->lock, flags); |
91312cdb | 1473 | port->count = 0; |
ccce6deb | 1474 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
61cd8a21 | 1475 | spin_unlock_irqrestore(&port->lock, flags); |
7b01478f | 1476 | tty_port_tty_set(port, NULL); |
bf903c0c GU |
1477 | if (!uart_console(state->uart_port)) |
1478 | uart_change_pm(state, UART_PM_STATE_OFF); | |
46d57a44 | 1479 | wake_up_interruptible(&port->open_wait); |
bdc04e31 | 1480 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 | 1481 | } |
a2bceae0 | 1482 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1483 | } |
1484 | ||
0b1db830 JS |
1485 | static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) |
1486 | { | |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | static void uart_port_shutdown(struct tty_port *port) | |
1491 | { | |
b922e19d JS |
1492 | struct uart_state *state = container_of(port, struct uart_state, port); |
1493 | struct uart_port *uport = state->uart_port; | |
1494 | ||
1495 | /* | |
1496 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
1497 | * the irq here so the queue might never be woken up. Note | |
1498 | * that we won't end up waiting on delta_msr_wait again since | |
1499 | * any outstanding file descriptors should be pointing at | |
1500 | * hung_up_tty_fops now. | |
1501 | */ | |
1502 | wake_up_interruptible(&port->delta_msr_wait); | |
1503 | ||
1504 | /* | |
1505 | * Free the IRQ and disable the port. | |
1506 | */ | |
1507 | uport->ops->shutdown(uport); | |
1508 | ||
1509 | /* | |
1510 | * Ensure that the IRQ handler isn't running on another CPU. | |
1511 | */ | |
1512 | synchronize_irq(uport->irq); | |
0b1db830 JS |
1513 | } |
1514 | ||
de0c8cb3 AC |
1515 | static int uart_carrier_raised(struct tty_port *port) |
1516 | { | |
1517 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1518 | struct uart_port *uport = state->uart_port; | |
1519 | int mctrl; | |
de0c8cb3 | 1520 | spin_lock_irq(&uport->lock); |
1fdc3106 | 1521 | uart_enable_ms(uport); |
de0c8cb3 AC |
1522 | mctrl = uport->ops->get_mctrl(uport); |
1523 | spin_unlock_irq(&uport->lock); | |
de0c8cb3 AC |
1524 | if (mctrl & TIOCM_CAR) |
1525 | return 1; | |
1526 | return 0; | |
1527 | } | |
1528 | ||
1529 | static void uart_dtr_rts(struct tty_port *port, int onoff) | |
1530 | { | |
1531 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1532 | struct uart_port *uport = state->uart_port; | |
24fcc7c8 | 1533 | |
6f5c24ad | 1534 | if (onoff) |
de0c8cb3 AC |
1535 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
1536 | else | |
1537 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); | |
de0c8cb3 AC |
1538 | } |
1539 | ||
1da177e4 | 1540 | /* |
ef4f527c KC |
1541 | * Calls to uart_open are serialised by the tty_lock in |
1542 | * drivers/tty/tty_io.c:tty_open() | |
1da177e4 LT |
1543 | * Note that if this fails, then uart_close() _will_ be called. |
1544 | * | |
1545 | * In time, we want to scrap the "opening nonpresent ports" | |
1546 | * behaviour and implement an alternative way for setserial | |
1547 | * to set base addresses/ports/types. This will allow us to | |
1548 | * get rid of a certain amount of extra tests. | |
1549 | */ | |
1550 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1551 | { | |
1552 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1da177e4 | 1553 | int retval, line = tty->index; |
1c7b13c4 JS |
1554 | struct uart_state *state = drv->state + line; |
1555 | struct tty_port *port = &state->port; | |
1da177e4 | 1556 | |
eb3a1e11 | 1557 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 | 1558 | |
1da177e4 | 1559 | /* |
1c7b13c4 JS |
1560 | * We take the semaphore here to guarantee that we won't be re-entered |
1561 | * while allocating the state structure, or while we request any IRQs | |
1562 | * that the driver may need. This also has the nice side-effect that | |
1563 | * it delays the action of uart_hangup, so we can guarantee that | |
1564 | * state->port.tty will always contain something reasonable. | |
1da177e4 | 1565 | */ |
1c7b13c4 JS |
1566 | if (mutex_lock_interruptible(&port->mutex)) { |
1567 | retval = -ERESTARTSYS; | |
1568 | goto end; | |
1569 | } | |
1570 | ||
1571 | port->count++; | |
1572 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { | |
1573 | retval = -ENXIO; | |
1574 | goto err_dec_count; | |
1da177e4 LT |
1575 | } |
1576 | ||
1577 | /* | |
1578 | * Once we set tty->driver_data here, we are guaranteed that | |
1579 | * uart_close() will decrement the driver module use count. | |
1580 | * Any failures from here onwards should not touch the count. | |
1581 | */ | |
1582 | tty->driver_data = state; | |
ebd2c8f6 | 1583 | state->uart_port->state = state; |
d6c53c0e JS |
1584 | state->port.low_latency = |
1585 | (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
7b01478f | 1586 | tty_port_tty_set(port, tty); |
1da177e4 | 1587 | |
1da177e4 LT |
1588 | /* |
1589 | * Start up the serial port. | |
1590 | */ | |
19225135 | 1591 | retval = uart_startup(tty, state, 0); |
1da177e4 LT |
1592 | |
1593 | /* | |
1594 | * If we succeeded, wait until the port is ready. | |
1595 | */ | |
61cd8a21 | 1596 | mutex_unlock(&port->mutex); |
1da177e4 | 1597 | if (retval == 0) |
74c21077 | 1598 | retval = tty_port_block_til_ready(port, tty, filp); |
1da177e4 | 1599 | |
1c7b13c4 | 1600 | end: |
1da177e4 | 1601 | return retval; |
1c7b13c4 JS |
1602 | err_dec_count: |
1603 | port->count--; | |
1604 | mutex_unlock(&port->mutex); | |
1605 | goto end; | |
1da177e4 LT |
1606 | } |
1607 | ||
1608 | static const char *uart_type(struct uart_port *port) | |
1609 | { | |
1610 | const char *str = NULL; | |
1611 | ||
1612 | if (port->ops->type) | |
1613 | str = port->ops->type(port); | |
1614 | ||
1615 | if (!str) | |
1616 | str = "unknown"; | |
1617 | ||
1618 | return str; | |
1619 | } | |
1620 | ||
1621 | #ifdef CONFIG_PROC_FS | |
1622 | ||
d196a949 | 1623 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1da177e4 LT |
1624 | { |
1625 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 1626 | struct tty_port *port = &state->port; |
6f538fe3 | 1627 | enum uart_pm_state pm_state; |
a2bceae0 | 1628 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
1629 | char stat_buf[32]; |
1630 | unsigned int status; | |
d196a949 | 1631 | int mmio; |
1da177e4 | 1632 | |
a2bceae0 | 1633 | if (!uport) |
d196a949 | 1634 | return; |
1da177e4 | 1635 | |
a2bceae0 | 1636 | mmio = uport->iotype >= UPIO_MEM; |
d196a949 | 1637 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
a2bceae0 | 1638 | uport->line, uart_type(uport), |
6c6a2334 | 1639 | mmio ? "mmio:0x" : "port:", |
a2bceae0 AC |
1640 | mmio ? (unsigned long long)uport->mapbase |
1641 | : (unsigned long long)uport->iobase, | |
1642 | uport->irq); | |
1da177e4 | 1643 | |
a2bceae0 | 1644 | if (uport->type == PORT_UNKNOWN) { |
d196a949 AD |
1645 | seq_putc(m, '\n'); |
1646 | return; | |
1da177e4 LT |
1647 | } |
1648 | ||
a46c9994 | 1649 | if (capable(CAP_SYS_ADMIN)) { |
a2bceae0 | 1650 | mutex_lock(&port->mutex); |
3689a0ec | 1651 | pm_state = state->pm_state; |
6f538fe3 LW |
1652 | if (pm_state != UART_PM_STATE_ON) |
1653 | uart_change_pm(state, UART_PM_STATE_ON); | |
a2bceae0 AC |
1654 | spin_lock_irq(&uport->lock); |
1655 | status = uport->ops->get_mctrl(uport); | |
1656 | spin_unlock_irq(&uport->lock); | |
6f538fe3 | 1657 | if (pm_state != UART_PM_STATE_ON) |
3689a0ec | 1658 | uart_change_pm(state, pm_state); |
a2bceae0 | 1659 | mutex_unlock(&port->mutex); |
1da177e4 | 1660 | |
d196a949 | 1661 | seq_printf(m, " tx:%d rx:%d", |
a2bceae0 AC |
1662 | uport->icount.tx, uport->icount.rx); |
1663 | if (uport->icount.frame) | |
d196a949 | 1664 | seq_printf(m, " fe:%d", |
a2bceae0 AC |
1665 | uport->icount.frame); |
1666 | if (uport->icount.parity) | |
d196a949 | 1667 | seq_printf(m, " pe:%d", |
a2bceae0 AC |
1668 | uport->icount.parity); |
1669 | if (uport->icount.brk) | |
d196a949 | 1670 | seq_printf(m, " brk:%d", |
a2bceae0 AC |
1671 | uport->icount.brk); |
1672 | if (uport->icount.overrun) | |
d196a949 | 1673 | seq_printf(m, " oe:%d", |
a2bceae0 | 1674 | uport->icount.overrun); |
a46c9994 AC |
1675 | |
1676 | #define INFOBIT(bit, str) \ | |
a2bceae0 | 1677 | if (uport->mctrl & (bit)) \ |
1da177e4 LT |
1678 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1679 | strlen(stat_buf) - 2) | |
a46c9994 | 1680 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1681 | if (status & (bit)) \ |
1682 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1683 | strlen(stat_buf) - 2) | |
1684 | ||
1685 | stat_buf[0] = '\0'; | |
1686 | stat_buf[1] = '\0'; | |
1687 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1688 | STATBIT(TIOCM_CTS, "|CTS"); | |
1689 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1690 | STATBIT(TIOCM_DSR, "|DSR"); | |
1691 | STATBIT(TIOCM_CAR, "|CD"); | |
1692 | STATBIT(TIOCM_RNG, "|RI"); | |
1693 | if (stat_buf[0]) | |
1694 | stat_buf[0] = ' '; | |
a46c9994 | 1695 | |
d196a949 | 1696 | seq_puts(m, stat_buf); |
1da177e4 | 1697 | } |
d196a949 | 1698 | seq_putc(m, '\n'); |
1da177e4 LT |
1699 | #undef STATBIT |
1700 | #undef INFOBIT | |
1da177e4 LT |
1701 | } |
1702 | ||
d196a949 | 1703 | static int uart_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1704 | { |
833bb304 | 1705 | struct tty_driver *ttydrv = m->private; |
1da177e4 | 1706 | struct uart_driver *drv = ttydrv->driver_state; |
d196a949 | 1707 | int i; |
1da177e4 | 1708 | |
d196a949 | 1709 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
1da177e4 | 1710 | "", "", ""); |
d196a949 AD |
1711 | for (i = 0; i < drv->nr; i++) |
1712 | uart_line_info(m, drv, i); | |
1713 | return 0; | |
1da177e4 | 1714 | } |
d196a949 AD |
1715 | |
1716 | static int uart_proc_open(struct inode *inode, struct file *file) | |
1717 | { | |
d9dda78b | 1718 | return single_open(file, uart_proc_show, PDE_DATA(inode)); |
d196a949 AD |
1719 | } |
1720 | ||
1721 | static const struct file_operations uart_proc_fops = { | |
1722 | .owner = THIS_MODULE, | |
1723 | .open = uart_proc_open, | |
1724 | .read = seq_read, | |
1725 | .llseek = seq_lseek, | |
1726 | .release = single_release, | |
1727 | }; | |
1da177e4 LT |
1728 | #endif |
1729 | ||
4a1b5502 | 1730 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1731 | /* |
1732 | * uart_console_write - write a console message to a serial port | |
1733 | * @port: the port to write the message | |
1734 | * @s: array of characters | |
1735 | * @count: number of characters in string to write | |
1736 | * @write: function to write character to port | |
1737 | */ | |
1738 | void uart_console_write(struct uart_port *port, const char *s, | |
1739 | unsigned int count, | |
1740 | void (*putchar)(struct uart_port *, int)) | |
1741 | { | |
1742 | unsigned int i; | |
1743 | ||
1744 | for (i = 0; i < count; i++, s++) { | |
1745 | if (*s == '\n') | |
1746 | putchar(port, '\r'); | |
1747 | putchar(port, *s); | |
1748 | } | |
1749 | } | |
1750 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1751 | ||
1da177e4 LT |
1752 | /* |
1753 | * Check whether an invalid uart number has been specified, and | |
1754 | * if so, search for the first available port that does have | |
1755 | * console support. | |
1756 | */ | |
1757 | struct uart_port * __init | |
1758 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1759 | { | |
1760 | int idx = co->index; | |
1761 | ||
1762 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1763 | ports[idx].membase == NULL)) | |
1764 | for (idx = 0; idx < nr; idx++) | |
1765 | if (ports[idx].iobase != 0 || | |
1766 | ports[idx].membase != NULL) | |
1767 | break; | |
1768 | ||
1769 | co->index = idx; | |
1770 | ||
1771 | return ports + idx; | |
1772 | } | |
1773 | ||
1774 | /** | |
02088ca6 | 1775 | * uart_parse_options - Parse serial port baud/parity/bits/flow control. |
1da177e4 LT |
1776 | * @options: pointer to option string |
1777 | * @baud: pointer to an 'int' variable for the baud rate. | |
1778 | * @parity: pointer to an 'int' variable for the parity. | |
1779 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1780 | * @flow: pointer to an 'int' variable for the flow control character. | |
1781 | * | |
1782 | * uart_parse_options decodes a string containing the serial console | |
1783 | * options. The format of the string is <baud><parity><bits><flow>, | |
1784 | * eg: 115200n8r | |
1785 | */ | |
f2d937f3 | 1786 | void |
1da177e4 LT |
1787 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1788 | { | |
1789 | char *s = options; | |
1790 | ||
1791 | *baud = simple_strtoul(s, NULL, 10); | |
1792 | while (*s >= '0' && *s <= '9') | |
1793 | s++; | |
1794 | if (*s) | |
1795 | *parity = *s++; | |
1796 | if (*s) | |
1797 | *bits = *s++ - '0'; | |
1798 | if (*s) | |
1799 | *flow = *s; | |
1800 | } | |
f2d937f3 | 1801 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1802 | |
1803 | struct baud_rates { | |
1804 | unsigned int rate; | |
1805 | unsigned int cflag; | |
1806 | }; | |
1807 | ||
cb3592be | 1808 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1809 | { 921600, B921600 }, |
1810 | { 460800, B460800 }, | |
1811 | { 230400, B230400 }, | |
1812 | { 115200, B115200 }, | |
1813 | { 57600, B57600 }, | |
1814 | { 38400, B38400 }, | |
1815 | { 19200, B19200 }, | |
1816 | { 9600, B9600 }, | |
1817 | { 4800, B4800 }, | |
1818 | { 2400, B2400 }, | |
1819 | { 1200, B1200 }, | |
1820 | { 0, B38400 } | |
1821 | }; | |
1822 | ||
1823 | /** | |
1824 | * uart_set_options - setup the serial console parameters | |
1825 | * @port: pointer to the serial ports uart_port structure | |
1826 | * @co: console pointer | |
1827 | * @baud: baud rate | |
1828 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1829 | * @bits: number of data bits | |
1830 | * @flow: flow control character - 'r' (rts) | |
1831 | */ | |
f2d937f3 | 1832 | int |
1da177e4 LT |
1833 | uart_set_options(struct uart_port *port, struct console *co, |
1834 | int baud, int parity, int bits, int flow) | |
1835 | { | |
606d099c | 1836 | struct ktermios termios; |
149b36ea | 1837 | static struct ktermios dummy; |
1da177e4 LT |
1838 | int i; |
1839 | ||
976ecd12 RK |
1840 | /* |
1841 | * Ensure that the serial console lock is initialised | |
1842 | * early. | |
42b6a1ba RW |
1843 | * If this port is a console, then the spinlock is already |
1844 | * initialised. | |
976ecd12 | 1845 | */ |
42b6a1ba RW |
1846 | if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { |
1847 | spin_lock_init(&port->lock); | |
1848 | lockdep_set_class(&port->lock, &port_lock_key); | |
1849 | } | |
976ecd12 | 1850 | |
606d099c | 1851 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1852 | |
1853 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1854 | ||
1855 | /* | |
1856 | * Construct a cflag setting. | |
1857 | */ | |
1858 | for (i = 0; baud_rates[i].rate; i++) | |
1859 | if (baud_rates[i].rate <= baud) | |
1860 | break; | |
1861 | ||
1862 | termios.c_cflag |= baud_rates[i].cflag; | |
1863 | ||
1864 | if (bits == 7) | |
1865 | termios.c_cflag |= CS7; | |
1866 | else | |
1867 | termios.c_cflag |= CS8; | |
1868 | ||
1869 | switch (parity) { | |
1870 | case 'o': case 'O': | |
1871 | termios.c_cflag |= PARODD; | |
1872 | /*fall through*/ | |
1873 | case 'e': case 'E': | |
1874 | termios.c_cflag |= PARENB; | |
1875 | break; | |
1876 | } | |
1877 | ||
1878 | if (flow == 'r') | |
1879 | termios.c_cflag |= CRTSCTS; | |
1880 | ||
79492689 YL |
1881 | /* |
1882 | * some uarts on other side don't support no flow control. | |
1883 | * So we set * DTR in host uart to make them happy | |
1884 | */ | |
1885 | port->mctrl |= TIOCM_DTR; | |
1886 | ||
149b36ea | 1887 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1888 | /* |
1889 | * Allow the setting of the UART parameters with a NULL console | |
1890 | * too: | |
1891 | */ | |
1892 | if (co) | |
1893 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1894 | |
1895 | return 0; | |
1896 | } | |
f2d937f3 | 1897 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1898 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1899 | ||
cf75525f JS |
1900 | /** |
1901 | * uart_change_pm - set power state of the port | |
1902 | * | |
1903 | * @state: port descriptor | |
1904 | * @pm_state: new state | |
1905 | * | |
1906 | * Locking: port->mutex has to be held | |
1907 | */ | |
6f538fe3 LW |
1908 | static void uart_change_pm(struct uart_state *state, |
1909 | enum uart_pm_state pm_state) | |
1da177e4 | 1910 | { |
ebd2c8f6 | 1911 | struct uart_port *port = state->uart_port; |
1281e360 AV |
1912 | |
1913 | if (state->pm_state != pm_state) { | |
1914 | if (port->ops->pm) | |
1915 | port->ops->pm(port, pm_state, state->pm_state); | |
1916 | state->pm_state = pm_state; | |
1917 | } | |
1da177e4 LT |
1918 | } |
1919 | ||
b3b708fa GL |
1920 | struct uart_match { |
1921 | struct uart_port *port; | |
1922 | struct uart_driver *driver; | |
1923 | }; | |
1924 | ||
1925 | static int serial_match_port(struct device *dev, void *data) | |
1926 | { | |
1927 | struct uart_match *match = data; | |
7ca796f4 GL |
1928 | struct tty_driver *tty_drv = match->driver->tty_driver; |
1929 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
1930 | match->port->line; | |
b3b708fa GL |
1931 | |
1932 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1933 | } | |
1934 | ||
ccce6deb | 1935 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1936 | { |
ccce6deb AC |
1937 | struct uart_state *state = drv->state + uport->line; |
1938 | struct tty_port *port = &state->port; | |
b3b708fa | 1939 | struct device *tty_dev; |
ccce6deb | 1940 | struct uart_match match = {uport, drv}; |
1da177e4 | 1941 | |
a2bceae0 | 1942 | mutex_lock(&port->mutex); |
1da177e4 | 1943 | |
ccce6deb | 1944 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
b3b708fa | 1945 | if (device_may_wakeup(tty_dev)) { |
3f960dbb G |
1946 | if (!enable_irq_wake(uport->irq)) |
1947 | uport->irq_wake = 1; | |
b3b708fa | 1948 | put_device(tty_dev); |
a2bceae0 | 1949 | mutex_unlock(&port->mutex); |
b3b708fa GL |
1950 | return 0; |
1951 | } | |
5a65dcc0 FV |
1952 | put_device(tty_dev); |
1953 | ||
4547be78 SB |
1954 | if (console_suspend_enabled || !uart_console(uport)) |
1955 | uport->suspended = 1; | |
b3b708fa | 1956 | |
ccce6deb AC |
1957 | if (port->flags & ASYNC_INITIALIZED) { |
1958 | const struct uart_ops *ops = uport->ops; | |
c8c6bfa3 | 1959 | int tries; |
1da177e4 | 1960 | |
4547be78 SB |
1961 | if (console_suspend_enabled || !uart_console(uport)) { |
1962 | set_bit(ASYNCB_SUSPENDED, &port->flags); | |
1963 | clear_bit(ASYNCB_INITIALIZED, &port->flags); | |
a6b93a90 | 1964 | |
4547be78 SB |
1965 | spin_lock_irq(&uport->lock); |
1966 | ops->stop_tx(uport); | |
1967 | ops->set_mctrl(uport, 0); | |
1968 | ops->stop_rx(uport); | |
1969 | spin_unlock_irq(&uport->lock); | |
1970 | } | |
1da177e4 LT |
1971 | |
1972 | /* | |
1973 | * Wait for the transmitter to empty. | |
1974 | */ | |
ccce6deb | 1975 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
1da177e4 | 1976 | msleep(10); |
c8c6bfa3 | 1977 | if (!tries) |
a46c9994 AC |
1978 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
1979 | "transmitter\n", | |
ccce6deb AC |
1980 | uport->dev ? dev_name(uport->dev) : "", |
1981 | uport->dev ? ": " : "", | |
8440838b | 1982 | drv->dev_name, |
ccce6deb | 1983 | drv->tty_driver->name_base + uport->line); |
1da177e4 | 1984 | |
4547be78 SB |
1985 | if (console_suspend_enabled || !uart_console(uport)) |
1986 | ops->shutdown(uport); | |
1da177e4 LT |
1987 | } |
1988 | ||
1989 | /* | |
1990 | * Disable the console device before suspending. | |
1991 | */ | |
4547be78 | 1992 | if (console_suspend_enabled && uart_console(uport)) |
ccce6deb | 1993 | console_stop(uport->cons); |
1da177e4 | 1994 | |
4547be78 | 1995 | if (console_suspend_enabled || !uart_console(uport)) |
6f538fe3 | 1996 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 | 1997 | |
a2bceae0 | 1998 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1999 | |
2000 | return 0; | |
2001 | } | |
2002 | ||
ccce6deb | 2003 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2004 | { |
ccce6deb AC |
2005 | struct uart_state *state = drv->state + uport->line; |
2006 | struct tty_port *port = &state->port; | |
03a74dcc | 2007 | struct device *tty_dev; |
ccce6deb | 2008 | struct uart_match match = {uport, drv}; |
ba15ab0e | 2009 | struct ktermios termios; |
1da177e4 | 2010 | |
a2bceae0 | 2011 | mutex_lock(&port->mutex); |
1da177e4 | 2012 | |
ccce6deb AC |
2013 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
2014 | if (!uport->suspended && device_may_wakeup(tty_dev)) { | |
3f960dbb G |
2015 | if (uport->irq_wake) { |
2016 | disable_irq_wake(uport->irq); | |
2017 | uport->irq_wake = 0; | |
2018 | } | |
5a65dcc0 | 2019 | put_device(tty_dev); |
a2bceae0 | 2020 | mutex_unlock(&port->mutex); |
b3b708fa GL |
2021 | return 0; |
2022 | } | |
5a65dcc0 | 2023 | put_device(tty_dev); |
ccce6deb | 2024 | uport->suspended = 0; |
b3b708fa | 2025 | |
1da177e4 LT |
2026 | /* |
2027 | * Re-enable the console device after suspending. | |
2028 | */ | |
5933a161 | 2029 | if (uart_console(uport)) { |
891b9dd1 JW |
2030 | /* |
2031 | * First try to use the console cflag setting. | |
2032 | */ | |
2033 | memset(&termios, 0, sizeof(struct ktermios)); | |
2034 | termios.c_cflag = uport->cons->cflag; | |
2035 | ||
2036 | /* | |
2037 | * If that's unset, use the tty termios setting. | |
2038 | */ | |
adc8d746 AC |
2039 | if (port->tty && termios.c_cflag == 0) |
2040 | termios = port->tty->termios; | |
891b9dd1 | 2041 | |
94abc56f | 2042 | if (console_suspend_enabled) |
6f538fe3 | 2043 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb | 2044 | uport->ops->set_termios(uport, &termios, NULL); |
5933a161 YK |
2045 | if (console_suspend_enabled) |
2046 | console_start(uport->cons); | |
1da177e4 LT |
2047 | } |
2048 | ||
ccce6deb AC |
2049 | if (port->flags & ASYNC_SUSPENDED) { |
2050 | const struct uart_ops *ops = uport->ops; | |
ee31b337 | 2051 | int ret; |
1da177e4 | 2052 | |
6f538fe3 | 2053 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb AC |
2054 | spin_lock_irq(&uport->lock); |
2055 | ops->set_mctrl(uport, 0); | |
2056 | spin_unlock_irq(&uport->lock); | |
4547be78 | 2057 | if (console_suspend_enabled || !uart_console(uport)) { |
19225135 AC |
2058 | /* Protected by port mutex for now */ |
2059 | struct tty_struct *tty = port->tty; | |
4547be78 SB |
2060 | ret = ops->startup(uport); |
2061 | if (ret == 0) { | |
19225135 AC |
2062 | if (tty) |
2063 | uart_change_speed(tty, state, NULL); | |
4547be78 SB |
2064 | spin_lock_irq(&uport->lock); |
2065 | ops->set_mctrl(uport, uport->mctrl); | |
2066 | ops->start_tx(uport); | |
2067 | spin_unlock_irq(&uport->lock); | |
2068 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
2069 | } else { | |
2070 | /* | |
2071 | * Failed to resume - maybe hardware went away? | |
2072 | * Clear the "initialized" flag so we won't try | |
2073 | * to call the low level drivers shutdown method. | |
2074 | */ | |
19225135 | 2075 | uart_shutdown(tty, state); |
4547be78 | 2076 | } |
ee31b337 | 2077 | } |
a6b93a90 | 2078 | |
ccce6deb | 2079 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
2080 | } |
2081 | ||
a2bceae0 | 2082 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2083 | |
2084 | return 0; | |
2085 | } | |
2086 | ||
2087 | static inline void | |
2088 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2089 | { | |
30b7a3bc RK |
2090 | char address[64]; |
2091 | ||
1da177e4 LT |
2092 | switch (port->iotype) { |
2093 | case UPIO_PORT: | |
9bde10a4 | 2094 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2095 | break; |
2096 | case UPIO_HUB6: | |
30b7a3bc | 2097 | snprintf(address, sizeof(address), |
9bde10a4 | 2098 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2099 | break; |
2100 | case UPIO_MEM: | |
2101 | case UPIO_MEM32: | |
21c614a7 | 2102 | case UPIO_AU: |
3be91ec7 | 2103 | case UPIO_TSI: |
30b7a3bc | 2104 | snprintf(address, sizeof(address), |
4f640efb | 2105 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2106 | break; |
2107 | default: | |
2108 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2109 | break; |
2110 | } | |
30b7a3bc | 2111 | |
7d12b976 | 2112 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n", |
4bfe090b | 2113 | port->dev ? dev_name(port->dev) : "", |
0cf669d5 | 2114 | port->dev ? ": " : "", |
8440838b DM |
2115 | drv->dev_name, |
2116 | drv->tty_driver->name_base + port->line, | |
7d12b976 | 2117 | address, port->irq, port->uartclk / 16, uart_type(port)); |
1da177e4 LT |
2118 | } |
2119 | ||
2120 | static void | |
2121 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2122 | struct uart_port *port) | |
2123 | { | |
2124 | unsigned int flags; | |
2125 | ||
2126 | /* | |
2127 | * If there isn't a port here, don't do anything further. | |
2128 | */ | |
2129 | if (!port->iobase && !port->mapbase && !port->membase) | |
2130 | return; | |
2131 | ||
2132 | /* | |
2133 | * Now do the auto configuration stuff. Note that config_port | |
2134 | * is expected to claim the resources and map the port for us. | |
2135 | */ | |
8e23fcc8 | 2136 | flags = 0; |
1da177e4 LT |
2137 | if (port->flags & UPF_AUTO_IRQ) |
2138 | flags |= UART_CONFIG_IRQ; | |
2139 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2140 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2141 | port->type = PORT_UNKNOWN; | |
2142 | flags |= UART_CONFIG_TYPE; | |
2143 | } | |
1da177e4 LT |
2144 | port->ops->config_port(port, flags); |
2145 | } | |
2146 | ||
2147 | if (port->type != PORT_UNKNOWN) { | |
2148 | unsigned long flags; | |
2149 | ||
2150 | uart_report_port(drv, port); | |
2151 | ||
3689a0ec | 2152 | /* Power up port for set_mctrl() */ |
6f538fe3 | 2153 | uart_change_pm(state, UART_PM_STATE_ON); |
3689a0ec | 2154 | |
1da177e4 LT |
2155 | /* |
2156 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2157 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2158 | * We probably don't need a spinlock around this, but |
2159 | */ | |
2160 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2161 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2162 | spin_unlock_irqrestore(&port->lock, flags); |
2163 | ||
97d97224 RK |
2164 | /* |
2165 | * If this driver supports console, and it hasn't been | |
2166 | * successfully registered yet, try to re-register it. | |
2167 | * It may be that the port was not available. | |
2168 | */ | |
2169 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2170 | register_console(port->cons); | |
2171 | ||
1da177e4 LT |
2172 | /* |
2173 | * Power down all ports by default, except the | |
2174 | * console if we have one. | |
2175 | */ | |
2176 | if (!uart_console(port)) | |
6f538fe3 | 2177 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 LT |
2178 | } |
2179 | } | |
2180 | ||
f2d937f3 JW |
2181 | #ifdef CONFIG_CONSOLE_POLL |
2182 | ||
2183 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2184 | { | |
2185 | struct uart_driver *drv = driver->driver_state; | |
2186 | struct uart_state *state = drv->state + line; | |
2187 | struct uart_port *port; | |
2188 | int baud = 9600; | |
2189 | int bits = 8; | |
2190 | int parity = 'n'; | |
2191 | int flow = 'n'; | |
c7f3e708 | 2192 | int ret; |
f2d937f3 | 2193 | |
ebd2c8f6 | 2194 | if (!state || !state->uart_port) |
f2d937f3 JW |
2195 | return -1; |
2196 | ||
ebd2c8f6 | 2197 | port = state->uart_port; |
f2d937f3 JW |
2198 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
2199 | return -1; | |
2200 | ||
c7f3e708 AV |
2201 | if (port->ops->poll_init) { |
2202 | struct tty_port *tport = &state->port; | |
2203 | ||
2204 | ret = 0; | |
2205 | mutex_lock(&tport->mutex); | |
2206 | /* | |
2207 | * We don't set ASYNCB_INITIALIZED as we only initialized the | |
2208 | * hw, e.g. state->xmit is still uninitialized. | |
2209 | */ | |
2210 | if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) | |
2211 | ret = port->ops->poll_init(port); | |
2212 | mutex_unlock(&tport->mutex); | |
2213 | if (ret) | |
2214 | return ret; | |
2215 | } | |
2216 | ||
f2d937f3 JW |
2217 | if (options) { |
2218 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2219 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2220 | } | |
2221 | ||
2222 | return 0; | |
2223 | } | |
2224 | ||
2225 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2226 | { | |
2227 | struct uart_driver *drv = driver->driver_state; | |
2228 | struct uart_state *state = drv->state + line; | |
2229 | struct uart_port *port; | |
2230 | ||
ebd2c8f6 | 2231 | if (!state || !state->uart_port) |
f2d937f3 JW |
2232 | return -1; |
2233 | ||
ebd2c8f6 | 2234 | port = state->uart_port; |
f2d937f3 JW |
2235 | return port->ops->poll_get_char(port); |
2236 | } | |
2237 | ||
2238 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2239 | { | |
2240 | struct uart_driver *drv = driver->driver_state; | |
2241 | struct uart_state *state = drv->state + line; | |
2242 | struct uart_port *port; | |
2243 | ||
ebd2c8f6 | 2244 | if (!state || !state->uart_port) |
f2d937f3 JW |
2245 | return; |
2246 | ||
ebd2c8f6 | 2247 | port = state->uart_port; |
c7d44a02 DA |
2248 | |
2249 | if (ch == '\n') | |
2250 | port->ops->poll_put_char(port, '\r'); | |
f2d937f3 JW |
2251 | port->ops->poll_put_char(port, ch); |
2252 | } | |
2253 | #endif | |
2254 | ||
b68e31d0 | 2255 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2256 | .open = uart_open, |
2257 | .close = uart_close, | |
2258 | .write = uart_write, | |
2259 | .put_char = uart_put_char, | |
2260 | .flush_chars = uart_flush_chars, | |
2261 | .write_room = uart_write_room, | |
2262 | .chars_in_buffer= uart_chars_in_buffer, | |
2263 | .flush_buffer = uart_flush_buffer, | |
2264 | .ioctl = uart_ioctl, | |
2265 | .throttle = uart_throttle, | |
2266 | .unthrottle = uart_unthrottle, | |
2267 | .send_xchar = uart_send_xchar, | |
2268 | .set_termios = uart_set_termios, | |
64e9159f | 2269 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2270 | .stop = uart_stop, |
2271 | .start = uart_start, | |
2272 | .hangup = uart_hangup, | |
2273 | .break_ctl = uart_break_ctl, | |
2274 | .wait_until_sent= uart_wait_until_sent, | |
2275 | #ifdef CONFIG_PROC_FS | |
d196a949 | 2276 | .proc_fops = &uart_proc_fops, |
1da177e4 LT |
2277 | #endif |
2278 | .tiocmget = uart_tiocmget, | |
2279 | .tiocmset = uart_tiocmset, | |
d281da7f | 2280 | .get_icount = uart_get_icount, |
f2d937f3 JW |
2281 | #ifdef CONFIG_CONSOLE_POLL |
2282 | .poll_init = uart_poll_init, | |
2283 | .poll_get_char = uart_poll_get_char, | |
2284 | .poll_put_char = uart_poll_put_char, | |
2285 | #endif | |
1da177e4 LT |
2286 | }; |
2287 | ||
de0c8cb3 | 2288 | static const struct tty_port_operations uart_port_ops = { |
0b1db830 JS |
2289 | .activate = uart_port_activate, |
2290 | .shutdown = uart_port_shutdown, | |
de0c8cb3 AC |
2291 | .carrier_raised = uart_carrier_raised, |
2292 | .dtr_rts = uart_dtr_rts, | |
2293 | }; | |
2294 | ||
1da177e4 LT |
2295 | /** |
2296 | * uart_register_driver - register a driver with the uart core layer | |
2297 | * @drv: low level driver structure | |
2298 | * | |
2299 | * Register a uart driver with the core driver. We in turn register | |
2300 | * with the tty layer, and initialise the core driver per-port state. | |
2301 | * | |
2302 | * We have a proc file in /proc/tty/driver which is named after the | |
2303 | * normal driver. | |
2304 | * | |
2305 | * drv->port should be NULL, and the per-port structures should be | |
2306 | * registered using uart_add_one_port after this call has succeeded. | |
2307 | */ | |
2308 | int uart_register_driver(struct uart_driver *drv) | |
2309 | { | |
9e845abf | 2310 | struct tty_driver *normal; |
1da177e4 LT |
2311 | int i, retval; |
2312 | ||
2313 | BUG_ON(drv->state); | |
2314 | ||
2315 | /* | |
2316 | * Maybe we should be using a slab cache for this, especially if | |
2317 | * we have a large number of ports to handle. | |
2318 | */ | |
8f31bb39 | 2319 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2320 | if (!drv->state) |
2321 | goto out; | |
2322 | ||
9e845abf | 2323 | normal = alloc_tty_driver(drv->nr); |
1da177e4 | 2324 | if (!normal) |
9e845abf | 2325 | goto out_kfree; |
1da177e4 LT |
2326 | |
2327 | drv->tty_driver = normal; | |
2328 | ||
1da177e4 | 2329 | normal->driver_name = drv->driver_name; |
1da177e4 LT |
2330 | normal->name = drv->dev_name; |
2331 | normal->major = drv->major; | |
2332 | normal->minor_start = drv->minor; | |
2333 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2334 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2335 | normal->init_termios = tty_std_termios; | |
2336 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2337 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2338 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2339 | normal->driver_state = drv; |
2340 | tty_set_operations(normal, &uart_ops); | |
2341 | ||
2342 | /* | |
2343 | * Initialise the UART state(s). | |
2344 | */ | |
2345 | for (i = 0; i < drv->nr; i++) { | |
2346 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 2347 | struct tty_port *port = &state->port; |
1da177e4 | 2348 | |
a2bceae0 | 2349 | tty_port_init(port); |
de0c8cb3 | 2350 | port->ops = &uart_port_ops; |
4cb0fbfd JS |
2351 | port->close_delay = HZ / 2; /* .5 seconds */ |
2352 | port->closing_wait = 30 * HZ;/* 30 seconds */ | |
1da177e4 LT |
2353 | } |
2354 | ||
2355 | retval = tty_register_driver(normal); | |
9e845abf AGR |
2356 | if (retval >= 0) |
2357 | return retval; | |
2358 | ||
191c5f10 JS |
2359 | for (i = 0; i < drv->nr; i++) |
2360 | tty_port_destroy(&drv->state[i].port); | |
9e845abf AGR |
2361 | put_tty_driver(normal); |
2362 | out_kfree: | |
2363 | kfree(drv->state); | |
2364 | out: | |
2365 | return -ENOMEM; | |
1da177e4 LT |
2366 | } |
2367 | ||
2368 | /** | |
2369 | * uart_unregister_driver - remove a driver from the uart core layer | |
2370 | * @drv: low level driver structure | |
2371 | * | |
2372 | * Remove all references to a driver from the core driver. The low | |
2373 | * level driver must have removed all its ports via the | |
2374 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2375 | * (ie, drv->port == NULL) | |
2376 | */ | |
2377 | void uart_unregister_driver(struct uart_driver *drv) | |
2378 | { | |
2379 | struct tty_driver *p = drv->tty_driver; | |
191c5f10 JS |
2380 | unsigned int i; |
2381 | ||
1da177e4 LT |
2382 | tty_unregister_driver(p); |
2383 | put_tty_driver(p); | |
191c5f10 JS |
2384 | for (i = 0; i < drv->nr; i++) |
2385 | tty_port_destroy(&drv->state[i].port); | |
1da177e4 | 2386 | kfree(drv->state); |
1e66cded | 2387 | drv->state = NULL; |
1da177e4 LT |
2388 | drv->tty_driver = NULL; |
2389 | } | |
2390 | ||
2391 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2392 | { | |
2393 | struct uart_driver *p = co->data; | |
2394 | *index = co->index; | |
2395 | return p->tty_driver; | |
2396 | } | |
2397 | ||
6915c0e4 TH |
2398 | static ssize_t uart_get_attr_uartclk(struct device *dev, |
2399 | struct device_attribute *attr, char *buf) | |
2400 | { | |
bebe73e3 | 2401 | struct serial_struct tmp; |
6915c0e4 | 2402 | struct tty_port *port = dev_get_drvdata(dev); |
6915c0e4 | 2403 | |
9f109694 | 2404 | uart_get_info(port, &tmp); |
bebe73e3 | 2405 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); |
6915c0e4 TH |
2406 | } |
2407 | ||
373bac4c AC |
2408 | static ssize_t uart_get_attr_type(struct device *dev, |
2409 | struct device_attribute *attr, char *buf) | |
2410 | { | |
2411 | struct serial_struct tmp; | |
2412 | struct tty_port *port = dev_get_drvdata(dev); | |
2413 | ||
2414 | uart_get_info(port, &tmp); | |
2415 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); | |
2416 | } | |
2417 | static ssize_t uart_get_attr_line(struct device *dev, | |
2418 | struct device_attribute *attr, char *buf) | |
2419 | { | |
2420 | struct serial_struct tmp; | |
2421 | struct tty_port *port = dev_get_drvdata(dev); | |
2422 | ||
2423 | uart_get_info(port, &tmp); | |
2424 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); | |
2425 | } | |
2426 | ||
2427 | static ssize_t uart_get_attr_port(struct device *dev, | |
2428 | struct device_attribute *attr, char *buf) | |
2429 | { | |
2430 | struct serial_struct tmp; | |
2431 | struct tty_port *port = dev_get_drvdata(dev); | |
fd985e1d | 2432 | unsigned long ioaddr; |
373bac4c AC |
2433 | |
2434 | uart_get_info(port, &tmp); | |
fd985e1d AM |
2435 | ioaddr = tmp.port; |
2436 | if (HIGH_BITS_OFFSET) | |
2437 | ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; | |
2438 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); | |
373bac4c AC |
2439 | } |
2440 | ||
2441 | static ssize_t uart_get_attr_irq(struct device *dev, | |
2442 | struct device_attribute *attr, char *buf) | |
2443 | { | |
2444 | struct serial_struct tmp; | |
2445 | struct tty_port *port = dev_get_drvdata(dev); | |
2446 | ||
2447 | uart_get_info(port, &tmp); | |
2448 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); | |
2449 | } | |
2450 | ||
2451 | static ssize_t uart_get_attr_flags(struct device *dev, | |
2452 | struct device_attribute *attr, char *buf) | |
2453 | { | |
2454 | struct serial_struct tmp; | |
2455 | struct tty_port *port = dev_get_drvdata(dev); | |
2456 | ||
2457 | uart_get_info(port, &tmp); | |
2458 | return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); | |
2459 | } | |
2460 | ||
2461 | static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, | |
2462 | struct device_attribute *attr, char *buf) | |
2463 | { | |
2464 | struct serial_struct tmp; | |
2465 | struct tty_port *port = dev_get_drvdata(dev); | |
2466 | ||
2467 | uart_get_info(port, &tmp); | |
2468 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); | |
2469 | } | |
2470 | ||
2471 | ||
2472 | static ssize_t uart_get_attr_close_delay(struct device *dev, | |
2473 | struct device_attribute *attr, char *buf) | |
2474 | { | |
2475 | struct serial_struct tmp; | |
2476 | struct tty_port *port = dev_get_drvdata(dev); | |
2477 | ||
2478 | uart_get_info(port, &tmp); | |
2479 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); | |
2480 | } | |
2481 | ||
2482 | ||
2483 | static ssize_t uart_get_attr_closing_wait(struct device *dev, | |
2484 | struct device_attribute *attr, char *buf) | |
2485 | { | |
2486 | struct serial_struct tmp; | |
2487 | struct tty_port *port = dev_get_drvdata(dev); | |
2488 | ||
2489 | uart_get_info(port, &tmp); | |
2490 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); | |
2491 | } | |
2492 | ||
2493 | static ssize_t uart_get_attr_custom_divisor(struct device *dev, | |
2494 | struct device_attribute *attr, char *buf) | |
2495 | { | |
2496 | struct serial_struct tmp; | |
2497 | struct tty_port *port = dev_get_drvdata(dev); | |
2498 | ||
2499 | uart_get_info(port, &tmp); | |
2500 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); | |
2501 | } | |
2502 | ||
2503 | static ssize_t uart_get_attr_io_type(struct device *dev, | |
2504 | struct device_attribute *attr, char *buf) | |
2505 | { | |
2506 | struct serial_struct tmp; | |
2507 | struct tty_port *port = dev_get_drvdata(dev); | |
2508 | ||
2509 | uart_get_info(port, &tmp); | |
2510 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); | |
2511 | } | |
2512 | ||
2513 | static ssize_t uart_get_attr_iomem_base(struct device *dev, | |
2514 | struct device_attribute *attr, char *buf) | |
2515 | { | |
2516 | struct serial_struct tmp; | |
2517 | struct tty_port *port = dev_get_drvdata(dev); | |
2518 | ||
2519 | uart_get_info(port, &tmp); | |
2520 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); | |
2521 | } | |
2522 | ||
2523 | static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, | |
2524 | struct device_attribute *attr, char *buf) | |
2525 | { | |
2526 | struct serial_struct tmp; | |
2527 | struct tty_port *port = dev_get_drvdata(dev); | |
2528 | ||
2529 | uart_get_info(port, &tmp); | |
2530 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); | |
2531 | } | |
2532 | ||
2533 | static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); | |
2534 | static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); | |
2535 | static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); | |
2536 | static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); | |
2537 | static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); | |
2538 | static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); | |
6915c0e4 | 2539 | static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); |
373bac4c AC |
2540 | static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); |
2541 | static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); | |
2542 | static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); | |
2543 | static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); | |
2544 | static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); | |
2545 | static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); | |
6915c0e4 TH |
2546 | |
2547 | static struct attribute *tty_dev_attrs[] = { | |
373bac4c AC |
2548 | &dev_attr_type.attr, |
2549 | &dev_attr_line.attr, | |
2550 | &dev_attr_port.attr, | |
2551 | &dev_attr_irq.attr, | |
2552 | &dev_attr_flags.attr, | |
2553 | &dev_attr_xmit_fifo_size.attr, | |
6915c0e4 | 2554 | &dev_attr_uartclk.attr, |
373bac4c AC |
2555 | &dev_attr_close_delay.attr, |
2556 | &dev_attr_closing_wait.attr, | |
2557 | &dev_attr_custom_divisor.attr, | |
2558 | &dev_attr_io_type.attr, | |
2559 | &dev_attr_iomem_base.attr, | |
2560 | &dev_attr_iomem_reg_shift.attr, | |
6915c0e4 TH |
2561 | NULL, |
2562 | }; | |
2563 | ||
b1b79916 | 2564 | static const struct attribute_group tty_dev_attr_group = { |
6915c0e4 TH |
2565 | .attrs = tty_dev_attrs, |
2566 | }; | |
2567 | ||
1da177e4 LT |
2568 | /** |
2569 | * uart_add_one_port - attach a driver-defined port structure | |
2570 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2571 | * @uport: uart port structure to use for this port. |
1da177e4 LT |
2572 | * |
2573 | * This allows the driver to register its own uart_port structure | |
2574 | * with the core driver. The main purpose is to allow the low | |
2575 | * level uart drivers to expand uart_port, rather than having yet | |
2576 | * more levels of structures. | |
2577 | */ | |
a2bceae0 | 2578 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 LT |
2579 | { |
2580 | struct uart_state *state; | |
a2bceae0 | 2581 | struct tty_port *port; |
1da177e4 | 2582 | int ret = 0; |
b3b708fa | 2583 | struct device *tty_dev; |
266dcff0 | 2584 | int num_groups; |
1da177e4 LT |
2585 | |
2586 | BUG_ON(in_interrupt()); | |
2587 | ||
a2bceae0 | 2588 | if (uport->line >= drv->nr) |
1da177e4 LT |
2589 | return -EINVAL; |
2590 | ||
a2bceae0 AC |
2591 | state = drv->state + uport->line; |
2592 | port = &state->port; | |
1da177e4 | 2593 | |
f392ecfa | 2594 | mutex_lock(&port_mutex); |
a2bceae0 | 2595 | mutex_lock(&port->mutex); |
ebd2c8f6 | 2596 | if (state->uart_port) { |
1da177e4 LT |
2597 | ret = -EINVAL; |
2598 | goto out; | |
2599 | } | |
2600 | ||
a2bceae0 | 2601 | state->uart_port = uport; |
6f538fe3 | 2602 | state->pm_state = UART_PM_STATE_UNDEFINED; |
1da177e4 | 2603 | |
a2bceae0 AC |
2604 | uport->cons = drv->cons; |
2605 | uport->state = state; | |
1da177e4 | 2606 | |
976ecd12 RK |
2607 | /* |
2608 | * If this port is a console, then the spinlock is already | |
2609 | * initialised. | |
2610 | */ | |
a2bceae0 AC |
2611 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
2612 | spin_lock_init(&uport->lock); | |
2613 | lockdep_set_class(&uport->lock, &port_lock_key); | |
13e83599 | 2614 | } |
a208ffd2 GL |
2615 | if (uport->cons && uport->dev) |
2616 | of_console_check(uport->dev->of_node, uport->cons->name, uport->line); | |
976ecd12 | 2617 | |
a2bceae0 | 2618 | uart_configure_port(drv, state, uport); |
1da177e4 | 2619 | |
266dcff0 GKH |
2620 | num_groups = 2; |
2621 | if (uport->attr_group) | |
2622 | num_groups++; | |
2623 | ||
c2b703b8 | 2624 | uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), |
266dcff0 GKH |
2625 | GFP_KERNEL); |
2626 | if (!uport->tty_groups) { | |
2627 | ret = -ENOMEM; | |
2628 | goto out; | |
2629 | } | |
2630 | uport->tty_groups[0] = &tty_dev_attr_group; | |
2631 | if (uport->attr_group) | |
2632 | uport->tty_groups[1] = uport->attr_group; | |
2633 | ||
1da177e4 LT |
2634 | /* |
2635 | * Register the port whether it's detected or not. This allows | |
015355b7 | 2636 | * setserial to be used to alter this port's parameters. |
1da177e4 | 2637 | */ |
b1b79916 | 2638 | tty_dev = tty_port_register_device_attr(port, drv->tty_driver, |
266dcff0 | 2639 | uport->line, uport->dev, port, uport->tty_groups); |
b3b708fa | 2640 | if (likely(!IS_ERR(tty_dev))) { |
77359835 SG |
2641 | device_set_wakeup_capable(tty_dev, 1); |
2642 | } else { | |
b3b708fa | 2643 | printk(KERN_ERR "Cannot register tty device on line %d\n", |
a2bceae0 | 2644 | uport->line); |
77359835 | 2645 | } |
1da177e4 | 2646 | |
68ac64cd RK |
2647 | /* |
2648 | * Ensure UPF_DEAD is not set. | |
2649 | */ | |
a2bceae0 | 2650 | uport->flags &= ~UPF_DEAD; |
68ac64cd | 2651 | |
1da177e4 | 2652 | out: |
a2bceae0 | 2653 | mutex_unlock(&port->mutex); |
f392ecfa | 2654 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2655 | |
2656 | return ret; | |
2657 | } | |
2658 | ||
2659 | /** | |
2660 | * uart_remove_one_port - detach a driver defined port structure | |
2661 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2662 | * @uport: uart port structure for this port |
1da177e4 LT |
2663 | * |
2664 | * This unhooks (and hangs up) the specified port structure from the | |
2665 | * core driver. No further calls will be made to the low-level code | |
2666 | * for this port. | |
2667 | */ | |
a2bceae0 | 2668 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2669 | { |
a2bceae0 AC |
2670 | struct uart_state *state = drv->state + uport->line; |
2671 | struct tty_port *port = &state->port; | |
4c6d5b4d | 2672 | struct tty_struct *tty; |
b342dd51 | 2673 | int ret = 0; |
1da177e4 LT |
2674 | |
2675 | BUG_ON(in_interrupt()); | |
2676 | ||
a2bceae0 | 2677 | if (state->uart_port != uport) |
1da177e4 | 2678 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
a2bceae0 | 2679 | state->uart_port, uport); |
1da177e4 | 2680 | |
f392ecfa | 2681 | mutex_lock(&port_mutex); |
1da177e4 | 2682 | |
68ac64cd RK |
2683 | /* |
2684 | * Mark the port "dead" - this prevents any opens from | |
2685 | * succeeding while we shut down the port. | |
2686 | */ | |
a2bceae0 | 2687 | mutex_lock(&port->mutex); |
b342dd51 CG |
2688 | if (!state->uart_port) { |
2689 | mutex_unlock(&port->mutex); | |
2690 | ret = -EINVAL; | |
2691 | goto out; | |
2692 | } | |
a2bceae0 AC |
2693 | uport->flags |= UPF_DEAD; |
2694 | mutex_unlock(&port->mutex); | |
68ac64cd | 2695 | |
1da177e4 | 2696 | /* |
aa4148cf | 2697 | * Remove the devices from the tty layer |
1da177e4 | 2698 | */ |
a2bceae0 | 2699 | tty_unregister_device(drv->tty_driver, uport->line); |
1da177e4 | 2700 | |
4c6d5b4d GU |
2701 | tty = tty_port_tty_get(port); |
2702 | if (tty) { | |
a2bceae0 | 2703 | tty_vhangup(port->tty); |
4c6d5b4d GU |
2704 | tty_kref_put(tty); |
2705 | } | |
68ac64cd | 2706 | |
5f5c9ae5 GU |
2707 | /* |
2708 | * If the port is used as a console, unregister it | |
2709 | */ | |
2710 | if (uart_console(uport)) | |
2711 | unregister_console(uport->cons); | |
2712 | ||
68ac64cd RK |
2713 | /* |
2714 | * Free the port IO and memory resources, if any. | |
2715 | */ | |
a2bceae0 AC |
2716 | if (uport->type != PORT_UNKNOWN) |
2717 | uport->ops->release_port(uport); | |
266dcff0 | 2718 | kfree(uport->tty_groups); |
68ac64cd RK |
2719 | |
2720 | /* | |
2721 | * Indicate that there isn't a port here anymore. | |
2722 | */ | |
a2bceae0 | 2723 | uport->type = PORT_UNKNOWN; |
68ac64cd | 2724 | |
ebd2c8f6 | 2725 | state->uart_port = NULL; |
b342dd51 | 2726 | out: |
f392ecfa | 2727 | mutex_unlock(&port_mutex); |
1da177e4 | 2728 | |
b342dd51 | 2729 | return ret; |
1da177e4 LT |
2730 | } |
2731 | ||
2732 | /* | |
2733 | * Are the two ports equivalent? | |
2734 | */ | |
2735 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2736 | { | |
2737 | if (port1->iotype != port2->iotype) | |
2738 | return 0; | |
2739 | ||
2740 | switch (port1->iotype) { | |
2741 | case UPIO_PORT: | |
2742 | return (port1->iobase == port2->iobase); | |
2743 | case UPIO_HUB6: | |
2744 | return (port1->iobase == port2->iobase) && | |
2745 | (port1->hub6 == port2->hub6); | |
2746 | case UPIO_MEM: | |
d21b55d3 SS |
2747 | case UPIO_MEM32: |
2748 | case UPIO_AU: | |
2749 | case UPIO_TSI: | |
1624f003 | 2750 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2751 | } |
2752 | return 0; | |
2753 | } | |
2754 | EXPORT_SYMBOL(uart_match_port); | |
2755 | ||
027d7dac JS |
2756 | /** |
2757 | * uart_handle_dcd_change - handle a change of carrier detect state | |
2758 | * @uport: uart_port structure for the open port | |
2759 | * @status: new carrier detect status, nonzero if active | |
2760 | */ | |
2761 | void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) | |
2762 | { | |
42381572 | 2763 | struct tty_port *port = &uport->state->port; |
43eca0ae | 2764 | struct tty_struct *tty = port->tty; |
42381572 | 2765 | struct tty_ldisc *ld = tty ? tty_ldisc_ref(tty) : NULL; |
027d7dac | 2766 | |
42381572 GS |
2767 | if (ld) { |
2768 | if (ld->ops->dcd_change) | |
2769 | ld->ops->dcd_change(tty, status); | |
2770 | tty_ldisc_deref(ld); | |
2771 | } | |
027d7dac JS |
2772 | |
2773 | uport->icount.dcd++; | |
027d7dac JS |
2774 | |
2775 | if (port->flags & ASYNC_CHECK_CD) { | |
2776 | if (status) | |
2777 | wake_up_interruptible(&port->open_wait); | |
43eca0ae AC |
2778 | else if (tty) |
2779 | tty_hangup(tty); | |
027d7dac | 2780 | } |
027d7dac JS |
2781 | } |
2782 | EXPORT_SYMBOL_GPL(uart_handle_dcd_change); | |
2783 | ||
2784 | /** | |
2785 | * uart_handle_cts_change - handle a change of clear-to-send state | |
2786 | * @uport: uart_port structure for the open port | |
2787 | * @status: new clear to send status, nonzero if active | |
2788 | */ | |
2789 | void uart_handle_cts_change(struct uart_port *uport, unsigned int status) | |
2790 | { | |
2791 | struct tty_port *port = &uport->state->port; | |
2792 | struct tty_struct *tty = port->tty; | |
2793 | ||
2794 | uport->icount.cts++; | |
2795 | ||
06aa82e4 MK |
2796 | /* skip below code if the hw flow control is supported */ |
2797 | if (tty_port_cts_enabled(port) && | |
2798 | !(uport->flags & UPF_HARD_FLOW)) { | |
027d7dac JS |
2799 | if (tty->hw_stopped) { |
2800 | if (status) { | |
2801 | tty->hw_stopped = 0; | |
2802 | uport->ops->start_tx(uport); | |
2803 | uart_write_wakeup(uport); | |
2804 | } | |
2805 | } else { | |
2806 | if (!status) { | |
2807 | tty->hw_stopped = 1; | |
2808 | uport->ops->stop_tx(uport); | |
2809 | } | |
2810 | } | |
2811 | } | |
2812 | } | |
2813 | EXPORT_SYMBOL_GPL(uart_handle_cts_change); | |
2814 | ||
cf75525f JS |
2815 | /** |
2816 | * uart_insert_char - push a char to the uart layer | |
2817 | * | |
2818 | * User is responsible to call tty_flip_buffer_push when they are done with | |
2819 | * insertion. | |
2820 | * | |
2821 | * @port: corresponding port | |
2822 | * @status: state of the serial port RX buffer (LSR for 8250) | |
2823 | * @overrun: mask of overrun bits in @status | |
2824 | * @ch: character to push | |
2825 | * @flag: flag for the character (see TTY_NORMAL and friends) | |
2826 | */ | |
027d7dac JS |
2827 | void uart_insert_char(struct uart_port *port, unsigned int status, |
2828 | unsigned int overrun, unsigned int ch, unsigned int flag) | |
2829 | { | |
92a19f9c | 2830 | struct tty_port *tport = &port->state->port; |
027d7dac JS |
2831 | |
2832 | if ((status & port->ignore_status_mask & ~overrun) == 0) | |
92a19f9c | 2833 | if (tty_insert_flip_char(tport, ch, flag) == 0) |
dabfb351 | 2834 | ++port->icount.buf_overrun; |
027d7dac JS |
2835 | |
2836 | /* | |
2837 | * Overrun is special. Since it's reported immediately, | |
2838 | * it doesn't affect the current character. | |
2839 | */ | |
2840 | if (status & ~port->ignore_status_mask & overrun) | |
92a19f9c | 2841 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) |
dabfb351 | 2842 | ++port->icount.buf_overrun; |
027d7dac JS |
2843 | } |
2844 | EXPORT_SYMBOL_GPL(uart_insert_char); | |
2845 | ||
1da177e4 LT |
2846 | EXPORT_SYMBOL(uart_write_wakeup); |
2847 | EXPORT_SYMBOL(uart_register_driver); | |
2848 | EXPORT_SYMBOL(uart_unregister_driver); | |
2849 | EXPORT_SYMBOL(uart_suspend_port); | |
2850 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2851 | EXPORT_SYMBOL(uart_add_one_port); |
2852 | EXPORT_SYMBOL(uart_remove_one_port); | |
2853 | ||
2854 | MODULE_DESCRIPTION("Serial driver core"); | |
2855 | MODULE_LICENSE("GPL"); |