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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Driver core for serial ports |
3 | * | |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Copyright 1999 ARM Limited | |
7 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/tty.h> | |
027d7dac | 25 | #include <linux/tty_flip.h> |
1da177e4 | 26 | #include <linux/slab.h> |
174cd4b1 | 27 | #include <linux/sched/signal.h> |
1da177e4 LT |
28 | #include <linux/init.h> |
29 | #include <linux/console.h> | |
a208ffd2 | 30 | #include <linux/of.h> |
d196a949 AD |
31 | #include <linux/proc_fs.h> |
32 | #include <linux/seq_file.h> | |
1da177e4 LT |
33 | #include <linux/device.h> |
34 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ | |
ccce6deb | 35 | #include <linux/serial_core.h> |
1da177e4 | 36 | #include <linux/delay.h> |
f392ecfa | 37 | #include <linux/mutex.h> |
1da177e4 LT |
38 | |
39 | #include <asm/irq.h> | |
7c0f6ba6 | 40 | #include <linux/uaccess.h> |
1da177e4 | 41 | |
1da177e4 LT |
42 | /* |
43 | * This is used to lock changes in serial line configuration. | |
44 | */ | |
f392ecfa | 45 | static DEFINE_MUTEX(port_mutex); |
1da177e4 | 46 | |
13e83599 IM |
47 | /* |
48 | * lockdep: port->lock is initialized in two places, but we | |
49 | * want only one lock-class: | |
50 | */ | |
51 | static struct lock_class_key port_lock_key; | |
52 | ||
1da177e4 LT |
53 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
54 | ||
19225135 | 55 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
a46c9994 | 56 | struct ktermios *old_termios); |
1f33a51d | 57 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
6f538fe3 LW |
58 | static void uart_change_pm(struct uart_state *state, |
59 | enum uart_pm_state pm_state); | |
1da177e4 | 60 | |
b922e19d JS |
61 | static void uart_port_shutdown(struct tty_port *port); |
62 | ||
299245a1 PH |
63 | static int uart_dcd_enabled(struct uart_port *uport) |
64 | { | |
d4260b51 | 65 | return !!(uport->status & UPSTAT_DCD_ENABLE); |
299245a1 PH |
66 | } |
67 | ||
9ed19428 PH |
68 | static inline struct uart_port *uart_port_ref(struct uart_state *state) |
69 | { | |
70 | if (atomic_add_unless(&state->refcount, 1, 0)) | |
71 | return state->uart_port; | |
72 | return NULL; | |
73 | } | |
74 | ||
75 | static inline void uart_port_deref(struct uart_port *uport) | |
76 | { | |
ef510bea | 77 | if (atomic_dec_and_test(&uport->state->refcount)) |
9ed19428 PH |
78 | wake_up(&uport->state->remove_wait); |
79 | } | |
80 | ||
81 | #define uart_port_lock(state, flags) \ | |
82 | ({ \ | |
83 | struct uart_port *__uport = uart_port_ref(state); \ | |
84 | if (__uport) \ | |
85 | spin_lock_irqsave(&__uport->lock, flags); \ | |
86 | __uport; \ | |
87 | }) | |
88 | ||
89 | #define uart_port_unlock(uport, flags) \ | |
90 | ({ \ | |
91 | struct uart_port *__uport = uport; \ | |
ef510bea | 92 | if (__uport) { \ |
9ed19428 | 93 | spin_unlock_irqrestore(&__uport->lock, flags); \ |
ef510bea AS |
94 | uart_port_deref(__uport); \ |
95 | } \ | |
9ed19428 PH |
96 | }) |
97 | ||
4047b371 PH |
98 | static inline struct uart_port *uart_port_check(struct uart_state *state) |
99 | { | |
7da4b8b7 | 100 | lockdep_assert_held(&state->port.mutex); |
4047b371 PH |
101 | return state->uart_port; |
102 | } | |
103 | ||
1da177e4 LT |
104 | /* |
105 | * This routine is used by the interrupt handler to schedule processing in | |
106 | * the software interrupt portion of the driver. | |
107 | */ | |
108 | void uart_write_wakeup(struct uart_port *port) | |
109 | { | |
ebd2c8f6 | 110 | struct uart_state *state = port->state; |
d5f735e5 PM |
111 | /* |
112 | * This means you called this function _after_ the port was | |
113 | * closed. No cookie for you. | |
114 | */ | |
ebd2c8f6 | 115 | BUG_ON(!state); |
d0f4bce2 | 116 | tty_port_tty_wakeup(&state->port); |
1da177e4 LT |
117 | } |
118 | ||
119 | static void uart_stop(struct tty_struct *tty) | |
120 | { | |
121 | struct uart_state *state = tty->driver_data; | |
9ed19428 | 122 | struct uart_port *port; |
1da177e4 LT |
123 | unsigned long flags; |
124 | ||
9ed19428 PH |
125 | port = uart_port_lock(state, flags); |
126 | if (port) | |
127 | port->ops->stop_tx(port); | |
128 | uart_port_unlock(port, flags); | |
1da177e4 LT |
129 | } |
130 | ||
131 | static void __uart_start(struct tty_struct *tty) | |
132 | { | |
133 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 134 | struct uart_port *port = state->uart_port; |
1da177e4 | 135 | |
9ed19428 | 136 | if (port && !uart_tx_stopped(port)) |
b129a8cc | 137 | port->ops->start_tx(port); |
1da177e4 LT |
138 | } |
139 | ||
140 | static void uart_start(struct tty_struct *tty) | |
141 | { | |
142 | struct uart_state *state = tty->driver_data; | |
9ed19428 | 143 | struct uart_port *port; |
1da177e4 LT |
144 | unsigned long flags; |
145 | ||
9ed19428 | 146 | port = uart_port_lock(state, flags); |
1da177e4 | 147 | __uart_start(tty); |
9ed19428 | 148 | uart_port_unlock(port, flags); |
1da177e4 LT |
149 | } |
150 | ||
f4581cab | 151 | static void |
1da177e4 LT |
152 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) |
153 | { | |
154 | unsigned long flags; | |
155 | unsigned int old; | |
156 | ||
157 | spin_lock_irqsave(&port->lock, flags); | |
158 | old = port->mctrl; | |
159 | port->mctrl = (old & ~clear) | set; | |
160 | if (old != port->mctrl) | |
161 | port->ops->set_mctrl(port, port->mctrl); | |
162 | spin_unlock_irqrestore(&port->lock, flags); | |
163 | } | |
164 | ||
a46c9994 AC |
165 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
166 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) | |
1da177e4 LT |
167 | |
168 | /* | |
169 | * Startup the port. This will be called once per open. All calls | |
df4f4dd4 | 170 | * will be serialised by the per-port mutex. |
1da177e4 | 171 | */ |
c0d92be6 JS |
172 | static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, |
173 | int init_hw) | |
1da177e4 | 174 | { |
4047b371 | 175 | struct uart_port *uport = uart_port_check(state); |
1da177e4 LT |
176 | unsigned long page; |
177 | int retval = 0; | |
178 | ||
46d57a44 | 179 | if (uport->type == PORT_UNKNOWN) |
c0d92be6 | 180 | return 1; |
1da177e4 | 181 | |
7deb39ed TP |
182 | /* |
183 | * Make sure the device is in D0 state. | |
184 | */ | |
185 | uart_change_pm(state, UART_PM_STATE_ON); | |
186 | ||
1da177e4 LT |
187 | /* |
188 | * Initialise and allocate the transmit and temporary | |
189 | * buffer. | |
190 | */ | |
ebd2c8f6 | 191 | if (!state->xmit.buf) { |
df4f4dd4 | 192 | /* This is protected by the per port mutex */ |
1da177e4 LT |
193 | page = get_zeroed_page(GFP_KERNEL); |
194 | if (!page) | |
195 | return -ENOMEM; | |
196 | ||
ebd2c8f6 AC |
197 | state->xmit.buf = (unsigned char *) page; |
198 | uart_circ_clear(&state->xmit); | |
1da177e4 LT |
199 | } |
200 | ||
46d57a44 | 201 | retval = uport->ops->startup(uport); |
1da177e4 | 202 | if (retval == 0) { |
c7d7abff | 203 | if (uart_console(uport) && uport->cons->cflag) { |
adc8d746 | 204 | tty->termios.c_cflag = uport->cons->cflag; |
c7d7abff JS |
205 | uport->cons->cflag = 0; |
206 | } | |
207 | /* | |
208 | * Initialise the hardware port settings. | |
209 | */ | |
210 | uart_change_speed(tty, state, NULL); | |
1da177e4 | 211 | |
9db276f8 PH |
212 | /* |
213 | * Setup the RTS and DTR signals once the | |
214 | * port is open and ready to respond. | |
215 | */ | |
216 | if (init_hw && C_BAUD(tty)) | |
217 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); | |
1da177e4 LT |
218 | } |
219 | ||
0055197e JS |
220 | /* |
221 | * This is to allow setserial on this port. People may want to set | |
222 | * port/irq/type and then reconfigure the port properly if it failed | |
223 | * now. | |
224 | */ | |
1da177e4 | 225 | if (retval && capable(CAP_SYS_ADMIN)) |
c0d92be6 JS |
226 | return 1; |
227 | ||
228 | return retval; | |
229 | } | |
230 | ||
231 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, | |
232 | int init_hw) | |
233 | { | |
234 | struct tty_port *port = &state->port; | |
235 | int retval; | |
236 | ||
d41861ca | 237 | if (tty_port_initialized(port)) |
c0d92be6 JS |
238 | return 0; |
239 | ||
c0d92be6 | 240 | retval = uart_port_startup(tty, state, init_hw); |
b3b57646 RH |
241 | if (retval) |
242 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 LT |
243 | |
244 | return retval; | |
245 | } | |
246 | ||
247 | /* | |
248 | * This routine will shutdown a serial port; interrupts are disabled, and | |
249 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
250 | * uart_shutdown are serialised by the per-port semaphore. | |
af224ca2 PH |
251 | * |
252 | * uport == NULL if uart_port has already been removed | |
1da177e4 | 253 | */ |
19225135 | 254 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
1da177e4 | 255 | { |
4047b371 | 256 | struct uart_port *uport = uart_port_check(state); |
bdc04e31 | 257 | struct tty_port *port = &state->port; |
1da177e4 | 258 | |
1da177e4 | 259 | /* |
ee31b337 | 260 | * Set the TTY IO error marker |
1da177e4 | 261 | */ |
f751928e AC |
262 | if (tty) |
263 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 264 | |
d41861ca PH |
265 | if (tty_port_initialized(port)) { |
266 | tty_port_set_initialized(port, 0); | |
267 | ||
ee31b337 RK |
268 | /* |
269 | * Turn off DTR and RTS early. | |
270 | */ | |
af224ca2 | 271 | if (uport && uart_console(uport) && tty) |
ae84db96 PH |
272 | uport->cons->cflag = tty->termios.c_cflag; |
273 | ||
9db276f8 | 274 | if (!tty || C_HUPCL(tty)) |
ccce6deb | 275 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
ee31b337 | 276 | |
b922e19d | 277 | uart_port_shutdown(port); |
ee31b337 | 278 | } |
1da177e4 LT |
279 | |
280 | /* | |
d208a3bf DA |
281 | * It's possible for shutdown to be called after suspend if we get |
282 | * a DCD drop (hangup) at just the right time. Clear suspended bit so | |
283 | * we don't try to resume a port that has been shutdown. | |
1da177e4 | 284 | */ |
80f02d54 | 285 | tty_port_set_suspended(port, 0); |
1da177e4 LT |
286 | |
287 | /* | |
288 | * Free the transmit buffer page. | |
289 | */ | |
ebd2c8f6 AC |
290 | if (state->xmit.buf) { |
291 | free_page((unsigned long)state->xmit.buf); | |
292 | state->xmit.buf = NULL; | |
1da177e4 | 293 | } |
1da177e4 LT |
294 | } |
295 | ||
296 | /** | |
297 | * uart_update_timeout - update per-port FIFO timeout. | |
298 | * @port: uart_port structure describing the port | |
299 | * @cflag: termios cflag value | |
300 | * @baud: speed of the port | |
301 | * | |
302 | * Set the port FIFO timeout value. The @cflag value should | |
303 | * reflect the actual hardware settings. | |
304 | */ | |
305 | void | |
306 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
307 | unsigned int baud) | |
308 | { | |
309 | unsigned int bits; | |
310 | ||
311 | /* byte size and parity */ | |
312 | switch (cflag & CSIZE) { | |
313 | case CS5: | |
314 | bits = 7; | |
315 | break; | |
316 | case CS6: | |
317 | bits = 8; | |
318 | break; | |
319 | case CS7: | |
320 | bits = 9; | |
321 | break; | |
322 | default: | |
323 | bits = 10; | |
a46c9994 | 324 | break; /* CS8 */ |
1da177e4 LT |
325 | } |
326 | ||
327 | if (cflag & CSTOPB) | |
328 | bits++; | |
329 | if (cflag & PARENB) | |
330 | bits++; | |
331 | ||
332 | /* | |
333 | * The total number of bits to be transmitted in the fifo. | |
334 | */ | |
335 | bits = bits * port->fifosize; | |
336 | ||
337 | /* | |
338 | * Figure the timeout to send the above number of bits. | |
339 | * Add .02 seconds of slop | |
340 | */ | |
341 | port->timeout = (HZ * bits) / baud + HZ/50; | |
342 | } | |
343 | ||
344 | EXPORT_SYMBOL(uart_update_timeout); | |
345 | ||
346 | /** | |
347 | * uart_get_baud_rate - return baud rate for a particular port | |
348 | * @port: uart_port structure describing the port in question. | |
349 | * @termios: desired termios settings. | |
350 | * @old: old termios (or NULL) | |
351 | * @min: minimum acceptable baud rate | |
352 | * @max: maximum acceptable baud rate | |
353 | * | |
354 | * Decode the termios structure into a numeric baud rate, | |
355 | * taking account of the magic 38400 baud rate (with spd_* | |
356 | * flags), and mapping the %B0 rate to 9600 baud. | |
357 | * | |
358 | * If the new baud rate is invalid, try the old termios setting. | |
359 | * If it's still invalid, we try 9600 baud. | |
360 | * | |
361 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
362 | * we're actually going to be using. Don't do this for the case |
363 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
364 | */ |
365 | unsigned int | |
606d099c AC |
366 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
367 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 | 368 | { |
f10a2233 JN |
369 | unsigned int try; |
370 | unsigned int baud; | |
371 | unsigned int altbaud; | |
eb424fd2 | 372 | int hung_up = 0; |
0077d45e | 373 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 | 374 | |
f10a2233 JN |
375 | switch (flags) { |
376 | case UPF_SPD_HI: | |
1da177e4 | 377 | altbaud = 57600; |
f10a2233 JN |
378 | break; |
379 | case UPF_SPD_VHI: | |
1da177e4 | 380 | altbaud = 115200; |
f10a2233 JN |
381 | break; |
382 | case UPF_SPD_SHI: | |
1da177e4 | 383 | altbaud = 230400; |
f10a2233 JN |
384 | break; |
385 | case UPF_SPD_WARP: | |
1da177e4 | 386 | altbaud = 460800; |
f10a2233 JN |
387 | break; |
388 | default: | |
389 | altbaud = 38400; | |
390 | break; | |
391 | } | |
1da177e4 LT |
392 | |
393 | for (try = 0; try < 2; try++) { | |
394 | baud = tty_termios_baud_rate(termios); | |
395 | ||
396 | /* | |
397 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
398 | * Die! Die! Die! | |
399 | */ | |
547039ec | 400 | if (try == 0 && baud == 38400) |
1da177e4 LT |
401 | baud = altbaud; |
402 | ||
403 | /* | |
404 | * Special case: B0 rate. | |
405 | */ | |
eb424fd2 AC |
406 | if (baud == 0) { |
407 | hung_up = 1; | |
1da177e4 | 408 | baud = 9600; |
eb424fd2 | 409 | } |
1da177e4 LT |
410 | |
411 | if (baud >= min && baud <= max) | |
412 | return baud; | |
413 | ||
414 | /* | |
415 | * Oops, the quotient was zero. Try again with | |
416 | * the old baud rate if possible. | |
417 | */ | |
418 | termios->c_cflag &= ~CBAUD; | |
419 | if (old) { | |
6d4d67be | 420 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
421 | if (!hung_up) |
422 | tty_termios_encode_baud_rate(termios, | |
423 | baud, baud); | |
1da177e4 LT |
424 | old = NULL; |
425 | continue; | |
426 | } | |
427 | ||
428 | /* | |
16ae2a87 AC |
429 | * As a last resort, if the range cannot be met then clip to |
430 | * the nearest chip supported rate. | |
1da177e4 | 431 | */ |
16ae2a87 AC |
432 | if (!hung_up) { |
433 | if (baud <= min) | |
434 | tty_termios_encode_baud_rate(termios, | |
435 | min + 1, min + 1); | |
436 | else | |
437 | tty_termios_encode_baud_rate(termios, | |
438 | max - 1, max - 1); | |
439 | } | |
1da177e4 | 440 | } |
16ae2a87 AC |
441 | /* Should never happen */ |
442 | WARN_ON(1); | |
1da177e4 LT |
443 | return 0; |
444 | } | |
445 | ||
446 | EXPORT_SYMBOL(uart_get_baud_rate); | |
447 | ||
448 | /** | |
449 | * uart_get_divisor - return uart clock divisor | |
450 | * @port: uart_port structure describing the port. | |
451 | * @baud: desired baud rate | |
452 | * | |
453 | * Calculate the uart clock divisor for the port. | |
454 | */ | |
455 | unsigned int | |
456 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
457 | { | |
458 | unsigned int quot; | |
459 | ||
460 | /* | |
461 | * Old custom speed handling. | |
462 | */ | |
463 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
464 | quot = port->custom_divisor; | |
465 | else | |
97d24634 | 466 | quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); |
1da177e4 LT |
467 | |
468 | return quot; | |
469 | } | |
470 | ||
471 | EXPORT_SYMBOL(uart_get_divisor); | |
472 | ||
7c8ab967 | 473 | /* Caller holds port mutex */ |
19225135 AC |
474 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
475 | struct ktermios *old_termios) | |
1da177e4 | 476 | { |
4047b371 | 477 | struct uart_port *uport = uart_port_check(state); |
606d099c | 478 | struct ktermios *termios; |
391f93f2 | 479 | int hw_stopped; |
1da177e4 LT |
480 | |
481 | /* | |
482 | * If we have no tty, termios, or the port does not exist, | |
483 | * then we can't set the parameters for this port. | |
484 | */ | |
adc8d746 | 485 | if (!tty || uport->type == PORT_UNKNOWN) |
1da177e4 LT |
486 | return; |
487 | ||
adc8d746 | 488 | termios = &tty->termios; |
c18b55fd | 489 | uport->ops->set_termios(uport, termios, old_termios); |
1da177e4 LT |
490 | |
491 | /* | |
299245a1 | 492 | * Set modem status enables based on termios cflag |
1da177e4 | 493 | */ |
299245a1 | 494 | spin_lock_irq(&uport->lock); |
1da177e4 | 495 | if (termios->c_cflag & CRTSCTS) |
299245a1 | 496 | uport->status |= UPSTAT_CTS_ENABLE; |
1da177e4 | 497 | else |
299245a1 | 498 | uport->status &= ~UPSTAT_CTS_ENABLE; |
1da177e4 LT |
499 | |
500 | if (termios->c_cflag & CLOCAL) | |
299245a1 | 501 | uport->status &= ~UPSTAT_DCD_ENABLE; |
1da177e4 | 502 | else |
299245a1 | 503 | uport->status |= UPSTAT_DCD_ENABLE; |
391f93f2 PH |
504 | |
505 | /* reset sw-assisted CTS flow control based on (possibly) new mode */ | |
506 | hw_stopped = uport->hw_stopped; | |
507 | uport->hw_stopped = uart_softcts_mode(uport) && | |
508 | !(uport->ops->get_mctrl(uport) & TIOCM_CTS); | |
509 | if (uport->hw_stopped) { | |
510 | if (!hw_stopped) | |
511 | uport->ops->stop_tx(uport); | |
512 | } else { | |
513 | if (hw_stopped) | |
514 | __uart_start(tty); | |
515 | } | |
299245a1 | 516 | spin_unlock_irq(&uport->lock); |
1da177e4 LT |
517 | } |
518 | ||
f5291ecc | 519 | static int uart_put_char(struct tty_struct *tty, unsigned char c) |
1da177e4 | 520 | { |
f5291ecc | 521 | struct uart_state *state = tty->driver_data; |
9ed19428 | 522 | struct uart_port *port; |
f5291ecc | 523 | struct circ_buf *circ; |
1da177e4 | 524 | unsigned long flags; |
23d22cea | 525 | int ret = 0; |
1da177e4 | 526 | |
f5291ecc | 527 | circ = &state->xmit; |
1da177e4 | 528 | if (!circ->buf) |
23d22cea | 529 | return 0; |
1da177e4 | 530 | |
9ed19428 PH |
531 | port = uart_port_lock(state, flags); |
532 | if (port && uart_circ_chars_free(circ) != 0) { | |
1da177e4 LT |
533 | circ->buf[circ->head] = c; |
534 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 535 | ret = 1; |
1da177e4 | 536 | } |
9ed19428 | 537 | uart_port_unlock(port, flags); |
23d22cea | 538 | return ret; |
1da177e4 LT |
539 | } |
540 | ||
1da177e4 LT |
541 | static void uart_flush_chars(struct tty_struct *tty) |
542 | { | |
543 | uart_start(tty); | |
544 | } | |
545 | ||
19225135 AC |
546 | static int uart_write(struct tty_struct *tty, |
547 | const unsigned char *buf, int count) | |
1da177e4 LT |
548 | { |
549 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
550 | struct uart_port *port; |
551 | struct circ_buf *circ; | |
1da177e4 LT |
552 | unsigned long flags; |
553 | int c, ret = 0; | |
554 | ||
d5f735e5 PM |
555 | /* |
556 | * This means you called this function _after_ the port was | |
557 | * closed. No cookie for you. | |
558 | */ | |
f751928e | 559 | if (!state) { |
d5f735e5 PM |
560 | WARN_ON(1); |
561 | return -EL3HLT; | |
562 | } | |
563 | ||
ebd2c8f6 | 564 | circ = &state->xmit; |
1da177e4 LT |
565 | if (!circ->buf) |
566 | return 0; | |
567 | ||
9ed19428 PH |
568 | port = uart_port_lock(state, flags); |
569 | while (port) { | |
1da177e4 LT |
570 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); |
571 | if (count < c) | |
572 | c = count; | |
573 | if (c <= 0) | |
574 | break; | |
575 | memcpy(circ->buf + circ->head, buf, c); | |
576 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
577 | buf += c; | |
578 | count -= c; | |
579 | ret += c; | |
580 | } | |
64dbee31 PH |
581 | |
582 | __uart_start(tty); | |
9ed19428 | 583 | uart_port_unlock(port, flags); |
1da177e4 LT |
584 | return ret; |
585 | } | |
586 | ||
587 | static int uart_write_room(struct tty_struct *tty) | |
588 | { | |
589 | struct uart_state *state = tty->driver_data; | |
9ed19428 | 590 | struct uart_port *port; |
f34d7a5b AC |
591 | unsigned long flags; |
592 | int ret; | |
1da177e4 | 593 | |
9ed19428 | 594 | port = uart_port_lock(state, flags); |
ebd2c8f6 | 595 | ret = uart_circ_chars_free(&state->xmit); |
9ed19428 | 596 | uart_port_unlock(port, flags); |
f34d7a5b | 597 | return ret; |
1da177e4 LT |
598 | } |
599 | ||
600 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
601 | { | |
602 | struct uart_state *state = tty->driver_data; | |
9ed19428 | 603 | struct uart_port *port; |
f34d7a5b AC |
604 | unsigned long flags; |
605 | int ret; | |
1da177e4 | 606 | |
9ed19428 | 607 | port = uart_port_lock(state, flags); |
ebd2c8f6 | 608 | ret = uart_circ_chars_pending(&state->xmit); |
9ed19428 | 609 | uart_port_unlock(port, flags); |
f34d7a5b | 610 | return ret; |
1da177e4 LT |
611 | } |
612 | ||
613 | static void uart_flush_buffer(struct tty_struct *tty) | |
614 | { | |
615 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 616 | struct uart_port *port; |
1da177e4 LT |
617 | unsigned long flags; |
618 | ||
d5f735e5 PM |
619 | /* |
620 | * This means you called this function _after_ the port was | |
621 | * closed. No cookie for you. | |
622 | */ | |
f751928e | 623 | if (!state) { |
d5f735e5 PM |
624 | WARN_ON(1); |
625 | return; | |
626 | } | |
627 | ||
eb3a1e11 | 628 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 | 629 | |
9ed19428 PH |
630 | port = uart_port_lock(state, flags); |
631 | if (!port) | |
632 | return; | |
ebd2c8f6 | 633 | uart_circ_clear(&state->xmit); |
6bb0e3a5 HS |
634 | if (port->ops->flush_buffer) |
635 | port->ops->flush_buffer(port); | |
9ed19428 | 636 | uart_port_unlock(port, flags); |
d0f4bce2 | 637 | tty_port_tty_wakeup(&state->port); |
1da177e4 LT |
638 | } |
639 | ||
640 | /* | |
641 | * This function is used to send a high-priority XON/XOFF character to | |
642 | * the device | |
643 | */ | |
644 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
645 | { | |
646 | struct uart_state *state = tty->driver_data; | |
9ed19428 | 647 | struct uart_port *port; |
1da177e4 LT |
648 | unsigned long flags; |
649 | ||
9ed19428 PH |
650 | port = uart_port_ref(state); |
651 | if (!port) | |
652 | return; | |
653 | ||
1da177e4 LT |
654 | if (port->ops->send_xchar) |
655 | port->ops->send_xchar(port, ch); | |
656 | else { | |
c235ccc1 | 657 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 658 | port->x_char = ch; |
c235ccc1 | 659 | if (ch) |
b129a8cc | 660 | port->ops->start_tx(port); |
c235ccc1 | 661 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 662 | } |
9ed19428 | 663 | uart_port_deref(port); |
1da177e4 LT |
664 | } |
665 | ||
666 | static void uart_throttle(struct tty_struct *tty) | |
667 | { | |
668 | struct uart_state *state = tty->driver_data; | |
9ed19428 | 669 | struct uart_port *port; |
391f93f2 | 670 | upstat_t mask = 0; |
1da177e4 | 671 | |
9ed19428 PH |
672 | port = uart_port_ref(state); |
673 | if (!port) | |
674 | return; | |
675 | ||
1da177e4 | 676 | if (I_IXOFF(tty)) |
391f93f2 | 677 | mask |= UPSTAT_AUTOXOFF; |
9db276f8 | 678 | if (C_CRTSCTS(tty)) |
391f93f2 | 679 | mask |= UPSTAT_AUTORTS; |
9aba8d5b | 680 | |
391f93f2 | 681 | if (port->status & mask) { |
9aba8d5b | 682 | port->ops->throttle(port); |
391f93f2 | 683 | mask &= ~port->status; |
9aba8d5b RK |
684 | } |
685 | ||
391f93f2 | 686 | if (mask & UPSTAT_AUTORTS) |
9aba8d5b | 687 | uart_clear_mctrl(port, TIOCM_RTS); |
b4749b97 PH |
688 | |
689 | if (mask & UPSTAT_AUTOXOFF) | |
690 | uart_send_xchar(tty, STOP_CHAR(tty)); | |
9ed19428 PH |
691 | |
692 | uart_port_deref(port); | |
1da177e4 LT |
693 | } |
694 | ||
695 | static void uart_unthrottle(struct tty_struct *tty) | |
696 | { | |
697 | struct uart_state *state = tty->driver_data; | |
9ed19428 | 698 | struct uart_port *port; |
391f93f2 | 699 | upstat_t mask = 0; |
1da177e4 | 700 | |
9ed19428 PH |
701 | port = uart_port_ref(state); |
702 | if (!port) | |
703 | return; | |
704 | ||
9aba8d5b | 705 | if (I_IXOFF(tty)) |
391f93f2 | 706 | mask |= UPSTAT_AUTOXOFF; |
9db276f8 | 707 | if (C_CRTSCTS(tty)) |
391f93f2 | 708 | mask |= UPSTAT_AUTORTS; |
9aba8d5b | 709 | |
391f93f2 | 710 | if (port->status & mask) { |
9aba8d5b | 711 | port->ops->unthrottle(port); |
391f93f2 | 712 | mask &= ~port->status; |
9aba8d5b | 713 | } |
1da177e4 | 714 | |
391f93f2 | 715 | if (mask & UPSTAT_AUTORTS) |
1da177e4 | 716 | uart_set_mctrl(port, TIOCM_RTS); |
b4749b97 PH |
717 | |
718 | if (mask & UPSTAT_AUTOXOFF) | |
719 | uart_send_xchar(tty, START_CHAR(tty)); | |
9ed19428 PH |
720 | |
721 | uart_port_deref(port); | |
1da177e4 LT |
722 | } |
723 | ||
4047b371 | 724 | static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) |
1da177e4 | 725 | { |
9f109694 | 726 | struct uart_state *state = container_of(port, struct uart_state, port); |
4047b371 PH |
727 | struct uart_port *uport; |
728 | int ret = -ENODEV; | |
f34d7a5b | 729 | |
37cd0c99 | 730 | memset(retinfo, 0, sizeof(*retinfo)); |
f34d7a5b | 731 | |
3abe8c76 PH |
732 | /* |
733 | * Ensure the state we copy is consistent and no hardware changes | |
734 | * occur as we go | |
735 | */ | |
736 | mutex_lock(&port->mutex); | |
4047b371 PH |
737 | uport = uart_port_check(state); |
738 | if (!uport) | |
739 | goto out; | |
740 | ||
7ba2e769 AC |
741 | retinfo->type = uport->type; |
742 | retinfo->line = uport->line; | |
743 | retinfo->port = uport->iobase; | |
1da177e4 | 744 | if (HIGH_BITS_OFFSET) |
7ba2e769 AC |
745 | retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
746 | retinfo->irq = uport->irq; | |
747 | retinfo->flags = uport->flags; | |
748 | retinfo->xmit_fifo_size = uport->fifosize; | |
749 | retinfo->baud_base = uport->uartclk / 16; | |
750 | retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; | |
751 | retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
1da177e4 | 752 | ASYNC_CLOSING_WAIT_NONE : |
4cb0fbfd | 753 | jiffies_to_msecs(port->closing_wait) / 10; |
7ba2e769 AC |
754 | retinfo->custom_divisor = uport->custom_divisor; |
755 | retinfo->hub6 = uport->hub6; | |
756 | retinfo->io_type = uport->iotype; | |
757 | retinfo->iomem_reg_shift = uport->regshift; | |
758 | retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; | |
4047b371 PH |
759 | |
760 | ret = 0; | |
761 | out: | |
a2bceae0 | 762 | mutex_unlock(&port->mutex); |
4047b371 | 763 | return ret; |
9f109694 AC |
764 | } |
765 | ||
766 | static int uart_get_info_user(struct tty_port *port, | |
767 | struct serial_struct __user *retinfo) | |
768 | { | |
769 | struct serial_struct tmp; | |
3abe8c76 | 770 | |
4047b371 PH |
771 | if (uart_get_info(port, &tmp) < 0) |
772 | return -EIO; | |
f34d7a5b | 773 | |
1da177e4 LT |
774 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
775 | return -EFAULT; | |
776 | return 0; | |
777 | } | |
778 | ||
7ba2e769 AC |
779 | static int uart_set_info(struct tty_struct *tty, struct tty_port *port, |
780 | struct uart_state *state, | |
781 | struct serial_struct *new_info) | |
1da177e4 | 782 | { |
4047b371 | 783 | struct uart_port *uport = uart_port_check(state); |
1da177e4 | 784 | unsigned long new_port; |
0077d45e | 785 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 786 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 787 | upf_t old_flags, new_flags; |
1da177e4 LT |
788 | int retval = 0; |
789 | ||
4047b371 PH |
790 | if (!uport) |
791 | return -EIO; | |
792 | ||
7ba2e769 | 793 | new_port = new_info->port; |
1da177e4 | 794 | if (HIGH_BITS_OFFSET) |
7ba2e769 | 795 | new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; |
1da177e4 | 796 | |
7ba2e769 AC |
797 | new_info->irq = irq_canonicalize(new_info->irq); |
798 | close_delay = msecs_to_jiffies(new_info->close_delay * 10); | |
799 | closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
4cb0fbfd | 800 | ASYNC_CLOSING_WAIT_NONE : |
7ba2e769 | 801 | msecs_to_jiffies(new_info->closing_wait * 10); |
1da177e4 | 802 | |
1da177e4 | 803 | |
46d57a44 | 804 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
7ba2e769 | 805 | && new_info->irq != uport->irq; |
1da177e4 LT |
806 | |
807 | /* | |
808 | * Since changing the 'type' of the port changes its resource | |
809 | * allocations, we should treat type changes the same as | |
810 | * IO port changes. | |
811 | */ | |
46d57a44 AC |
812 | change_port = !(uport->flags & UPF_FIXED_PORT) |
813 | && (new_port != uport->iobase || | |
7ba2e769 AC |
814 | (unsigned long)new_info->iomem_base != uport->mapbase || |
815 | new_info->hub6 != uport->hub6 || | |
816 | new_info->io_type != uport->iotype || | |
817 | new_info->iomem_reg_shift != uport->regshift || | |
818 | new_info->type != uport->type); | |
46d57a44 AC |
819 | |
820 | old_flags = uport->flags; | |
7ba2e769 | 821 | new_flags = new_info->flags; |
46d57a44 | 822 | old_custom_divisor = uport->custom_divisor; |
1da177e4 LT |
823 | |
824 | if (!capable(CAP_SYS_ADMIN)) { | |
825 | retval = -EPERM; | |
826 | if (change_irq || change_port || | |
7ba2e769 | 827 | (new_info->baud_base != uport->uartclk / 16) || |
46d57a44 AC |
828 | (close_delay != port->close_delay) || |
829 | (closing_wait != port->closing_wait) || | |
7ba2e769 AC |
830 | (new_info->xmit_fifo_size && |
831 | new_info->xmit_fifo_size != uport->fifosize) || | |
0077d45e | 832 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 | 833 | goto exit; |
46d57a44 | 834 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
0077d45e | 835 | (new_flags & UPF_USR_MASK)); |
7ba2e769 | 836 | uport->custom_divisor = new_info->custom_divisor; |
1da177e4 LT |
837 | goto check_and_exit; |
838 | } | |
839 | ||
840 | /* | |
841 | * Ask the low level driver to verify the settings. | |
842 | */ | |
46d57a44 | 843 | if (uport->ops->verify_port) |
7ba2e769 | 844 | retval = uport->ops->verify_port(uport, new_info); |
1da177e4 | 845 | |
7ba2e769 AC |
846 | if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || |
847 | (new_info->baud_base < 9600)) | |
1da177e4 LT |
848 | retval = -EINVAL; |
849 | ||
850 | if (retval) | |
851 | goto exit; | |
852 | ||
853 | if (change_port || change_irq) { | |
854 | retval = -EBUSY; | |
855 | ||
856 | /* | |
857 | * Make sure that we are the sole user of this port. | |
858 | */ | |
b58d13a0 | 859 | if (tty_port_users(port) > 1) |
1da177e4 LT |
860 | goto exit; |
861 | ||
862 | /* | |
863 | * We need to shutdown the serial port at the old | |
864 | * port/type/irq combination. | |
865 | */ | |
19225135 | 866 | uart_shutdown(tty, state); |
1da177e4 LT |
867 | } |
868 | ||
869 | if (change_port) { | |
870 | unsigned long old_iobase, old_mapbase; | |
871 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
872 | ||
46d57a44 AC |
873 | old_iobase = uport->iobase; |
874 | old_mapbase = uport->mapbase; | |
875 | old_type = uport->type; | |
876 | old_hub6 = uport->hub6; | |
877 | old_iotype = uport->iotype; | |
878 | old_shift = uport->regshift; | |
1da177e4 LT |
879 | |
880 | /* | |
881 | * Free and release old regions | |
882 | */ | |
a7cfaf16 | 883 | if (old_type != PORT_UNKNOWN && uport->ops->release_port) |
46d57a44 | 884 | uport->ops->release_port(uport); |
1da177e4 | 885 | |
46d57a44 | 886 | uport->iobase = new_port; |
7ba2e769 AC |
887 | uport->type = new_info->type; |
888 | uport->hub6 = new_info->hub6; | |
889 | uport->iotype = new_info->io_type; | |
890 | uport->regshift = new_info->iomem_reg_shift; | |
891 | uport->mapbase = (unsigned long)new_info->iomem_base; | |
1da177e4 LT |
892 | |
893 | /* | |
894 | * Claim and map the new regions | |
895 | */ | |
a7cfaf16 | 896 | if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { |
46d57a44 | 897 | retval = uport->ops->request_port(uport); |
1da177e4 LT |
898 | } else { |
899 | /* Always success - Jean II */ | |
900 | retval = 0; | |
901 | } | |
902 | ||
903 | /* | |
904 | * If we fail to request resources for the | |
905 | * new port, try to restore the old settings. | |
906 | */ | |
7deb39ed | 907 | if (retval) { |
46d57a44 AC |
908 | uport->iobase = old_iobase; |
909 | uport->type = old_type; | |
910 | uport->hub6 = old_hub6; | |
911 | uport->iotype = old_iotype; | |
912 | uport->regshift = old_shift; | |
913 | uport->mapbase = old_mapbase; | |
1da177e4 | 914 | |
7deb39ed TP |
915 | if (old_type != PORT_UNKNOWN) { |
916 | retval = uport->ops->request_port(uport); | |
917 | /* | |
918 | * If we failed to restore the old settings, | |
919 | * we fail like this. | |
920 | */ | |
921 | if (retval) | |
922 | uport->type = PORT_UNKNOWN; | |
923 | ||
924 | /* | |
925 | * We failed anyway. | |
926 | */ | |
927 | retval = -EBUSY; | |
928 | } | |
929 | ||
a46c9994 AC |
930 | /* Added to return the correct error -Ram Gupta */ |
931 | goto exit; | |
1da177e4 LT |
932 | } |
933 | } | |
934 | ||
abb4a239 | 935 | if (change_irq) |
7ba2e769 | 936 | uport->irq = new_info->irq; |
46d57a44 | 937 | if (!(uport->flags & UPF_FIXED_PORT)) |
7ba2e769 | 938 | uport->uartclk = new_info->baud_base * 16; |
46d57a44 | 939 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
0077d45e | 940 | (new_flags & UPF_CHANGE_MASK); |
7ba2e769 | 941 | uport->custom_divisor = new_info->custom_divisor; |
46d57a44 AC |
942 | port->close_delay = close_delay; |
943 | port->closing_wait = closing_wait; | |
7ba2e769 AC |
944 | if (new_info->xmit_fifo_size) |
945 | uport->fifosize = new_info->xmit_fifo_size; | |
d6c53c0e | 946 | port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
947 | |
948 | check_and_exit: | |
949 | retval = 0; | |
46d57a44 | 950 | if (uport->type == PORT_UNKNOWN) |
1da177e4 | 951 | goto exit; |
d41861ca | 952 | if (tty_port_initialized(port)) { |
46d57a44 AC |
953 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
954 | old_custom_divisor != uport->custom_divisor) { | |
1da177e4 LT |
955 | /* |
956 | * If they're setting up a custom divisor or speed, | |
957 | * instead of clearing it, then bitch about it. No | |
958 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
959 | */ | |
46d57a44 | 960 | if (uport->flags & UPF_SPD_MASK) { |
2f2dafe7 SM |
961 | dev_notice(uport->dev, |
962 | "%s sets custom speed on %s. This is deprecated.\n", | |
963 | current->comm, | |
429b4749 | 964 | tty_name(port->tty)); |
1da177e4 | 965 | } |
19225135 | 966 | uart_change_speed(tty, state, NULL); |
1da177e4 | 967 | } |
b3b57646 | 968 | } else { |
19225135 | 969 | retval = uart_startup(tty, state, 1); |
b3b57646 RH |
970 | if (retval > 0) |
971 | retval = 0; | |
972 | } | |
1da177e4 | 973 | exit: |
7ba2e769 AC |
974 | return retval; |
975 | } | |
976 | ||
977 | static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, | |
978 | struct serial_struct __user *newinfo) | |
979 | { | |
980 | struct serial_struct new_serial; | |
981 | struct tty_port *port = &state->port; | |
982 | int retval; | |
983 | ||
984 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
985 | return -EFAULT; | |
986 | ||
987 | /* | |
988 | * This semaphore protects port->count. It is also | |
989 | * very useful to prevent opens. Also, take the | |
990 | * port configuration semaphore to make sure that a | |
991 | * module insertion/removal doesn't change anything | |
992 | * under us. | |
993 | */ | |
994 | mutex_lock(&port->mutex); | |
995 | retval = uart_set_info(tty, port, state, &new_serial); | |
a2bceae0 | 996 | mutex_unlock(&port->mutex); |
1da177e4 LT |
997 | return retval; |
998 | } | |
999 | ||
19225135 AC |
1000 | /** |
1001 | * uart_get_lsr_info - get line status register info | |
1002 | * @tty: tty associated with the UART | |
1003 | * @state: UART being queried | |
1004 | * @value: returned modem value | |
1da177e4 | 1005 | */ |
19225135 AC |
1006 | static int uart_get_lsr_info(struct tty_struct *tty, |
1007 | struct uart_state *state, unsigned int __user *value) | |
1da177e4 | 1008 | { |
4047b371 | 1009 | struct uart_port *uport = uart_port_check(state); |
1da177e4 LT |
1010 | unsigned int result; |
1011 | ||
46d57a44 | 1012 | result = uport->ops->tx_empty(uport); |
1da177e4 LT |
1013 | |
1014 | /* | |
1015 | * If we're about to load something into the transmit | |
1016 | * register, we'll pretend the transmitter isn't empty to | |
1017 | * avoid a race condition (depending on when the transmit | |
1018 | * interrupt happens). | |
1019 | */ | |
46d57a44 | 1020 | if (uport->x_char || |
ebd2c8f6 | 1021 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
d01f4d18 | 1022 | !uart_tx_stopped(uport))) |
1da177e4 | 1023 | result &= ~TIOCSER_TEMT; |
a46c9994 | 1024 | |
1da177e4 LT |
1025 | return put_user(result, value); |
1026 | } | |
1027 | ||
60b33c13 | 1028 | static int uart_tiocmget(struct tty_struct *tty) |
1da177e4 LT |
1029 | { |
1030 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1031 | struct tty_port *port = &state->port; |
4047b371 | 1032 | struct uart_port *uport; |
1da177e4 LT |
1033 | int result = -EIO; |
1034 | ||
a2bceae0 | 1035 | mutex_lock(&port->mutex); |
4047b371 PH |
1036 | uport = uart_port_check(state); |
1037 | if (!uport) | |
1038 | goto out; | |
1039 | ||
18900ca6 | 1040 | if (!tty_io_error(tty)) { |
46d57a44 | 1041 | result = uport->mctrl; |
46d57a44 AC |
1042 | spin_lock_irq(&uport->lock); |
1043 | result |= uport->ops->get_mctrl(uport); | |
1044 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1045 | } |
4047b371 | 1046 | out: |
a2bceae0 | 1047 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1048 | return result; |
1049 | } | |
1050 | ||
1051 | static int | |
20b9d177 | 1052 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
1da177e4 LT |
1053 | { |
1054 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1055 | struct tty_port *port = &state->port; |
4047b371 | 1056 | struct uart_port *uport; |
1da177e4 LT |
1057 | int ret = -EIO; |
1058 | ||
a2bceae0 | 1059 | mutex_lock(&port->mutex); |
4047b371 PH |
1060 | uport = uart_port_check(state); |
1061 | if (!uport) | |
1062 | goto out; | |
1063 | ||
18900ca6 | 1064 | if (!tty_io_error(tty)) { |
46d57a44 | 1065 | uart_update_mctrl(uport, set, clear); |
1da177e4 LT |
1066 | ret = 0; |
1067 | } | |
4047b371 | 1068 | out: |
a2bceae0 | 1069 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1070 | return ret; |
1071 | } | |
1072 | ||
9e98966c | 1073 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
1074 | { |
1075 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1076 | struct tty_port *port = &state->port; |
4047b371 PH |
1077 | struct uart_port *uport; |
1078 | int ret = -EIO; | |
1da177e4 | 1079 | |
a2bceae0 | 1080 | mutex_lock(&port->mutex); |
4047b371 PH |
1081 | uport = uart_port_check(state); |
1082 | if (!uport) | |
1083 | goto out; | |
1da177e4 | 1084 | |
46d57a44 AC |
1085 | if (uport->type != PORT_UNKNOWN) |
1086 | uport->ops->break_ctl(uport, break_state); | |
4047b371 PH |
1087 | ret = 0; |
1088 | out: | |
a2bceae0 | 1089 | mutex_unlock(&port->mutex); |
4047b371 | 1090 | return ret; |
1da177e4 LT |
1091 | } |
1092 | ||
19225135 | 1093 | static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) |
1da177e4 | 1094 | { |
a2bceae0 | 1095 | struct tty_port *port = &state->port; |
4047b371 | 1096 | struct uart_port *uport; |
1da177e4 LT |
1097 | int flags, ret; |
1098 | ||
1099 | if (!capable(CAP_SYS_ADMIN)) | |
1100 | return -EPERM; | |
1101 | ||
1102 | /* | |
1103 | * Take the per-port semaphore. This prevents count from | |
1104 | * changing, and hence any extra opens of the port while | |
1105 | * we're auto-configuring. | |
1106 | */ | |
a2bceae0 | 1107 | if (mutex_lock_interruptible(&port->mutex)) |
1da177e4 LT |
1108 | return -ERESTARTSYS; |
1109 | ||
4047b371 PH |
1110 | uport = uart_port_check(state); |
1111 | if (!uport) { | |
1112 | ret = -EIO; | |
1113 | goto out; | |
1114 | } | |
1115 | ||
1da177e4 | 1116 | ret = -EBUSY; |
b58d13a0 | 1117 | if (tty_port_users(port) == 1) { |
19225135 | 1118 | uart_shutdown(tty, state); |
1da177e4 LT |
1119 | |
1120 | /* | |
1121 | * If we already have a port type configured, | |
1122 | * we must release its resources. | |
1123 | */ | |
a7cfaf16 | 1124 | if (uport->type != PORT_UNKNOWN && uport->ops->release_port) |
46d57a44 | 1125 | uport->ops->release_port(uport); |
1da177e4 LT |
1126 | |
1127 | flags = UART_CONFIG_TYPE; | |
46d57a44 | 1128 | if (uport->flags & UPF_AUTO_IRQ) |
1da177e4 LT |
1129 | flags |= UART_CONFIG_IRQ; |
1130 | ||
1131 | /* | |
1132 | * This will claim the ports resources if | |
1133 | * a port is found. | |
1134 | */ | |
46d57a44 | 1135 | uport->ops->config_port(uport, flags); |
1da177e4 | 1136 | |
19225135 | 1137 | ret = uart_startup(tty, state, 1); |
b3b57646 RH |
1138 | if (ret > 0) |
1139 | ret = 0; | |
1da177e4 | 1140 | } |
4047b371 | 1141 | out: |
a2bceae0 | 1142 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1143 | return ret; |
1144 | } | |
1145 | ||
1fdc3106 AS |
1146 | static void uart_enable_ms(struct uart_port *uport) |
1147 | { | |
1148 | /* | |
1149 | * Force modem status interrupts on | |
1150 | */ | |
1151 | if (uport->ops->enable_ms) | |
1152 | uport->ops->enable_ms(uport); | |
1153 | } | |
1154 | ||
1da177e4 LT |
1155 | /* |
1156 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1157 | * - mask passed in arg for lines of interest | |
1158 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1159 | * Caller should use TIOCGICOUNT to see which one it was | |
bdc04e31 AC |
1160 | * |
1161 | * FIXME: This wants extracting into a common all driver implementation | |
1162 | * of TIOCMWAIT using tty_port. | |
1da177e4 | 1163 | */ |
9ed19428 | 1164 | static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) |
1da177e4 | 1165 | { |
9ed19428 | 1166 | struct uart_port *uport; |
bdc04e31 | 1167 | struct tty_port *port = &state->port; |
1da177e4 LT |
1168 | DECLARE_WAITQUEUE(wait, current); |
1169 | struct uart_icount cprev, cnow; | |
1170 | int ret; | |
1171 | ||
1172 | /* | |
1173 | * note the counters on entry | |
1174 | */ | |
9ed19428 PH |
1175 | uport = uart_port_ref(state); |
1176 | if (!uport) | |
1177 | return -EIO; | |
46d57a44 AC |
1178 | spin_lock_irq(&uport->lock); |
1179 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); | |
1fdc3106 | 1180 | uart_enable_ms(uport); |
46d57a44 | 1181 | spin_unlock_irq(&uport->lock); |
1da177e4 | 1182 | |
bdc04e31 | 1183 | add_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 | 1184 | for (;;) { |
46d57a44 AC |
1185 | spin_lock_irq(&uport->lock); |
1186 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1187 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1188 | |
1189 | set_current_state(TASK_INTERRUPTIBLE); | |
1190 | ||
1191 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1192 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1193 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1194 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1195 | ret = 0; |
1196 | break; | |
1da177e4 LT |
1197 | } |
1198 | ||
1199 | schedule(); | |
1200 | ||
1201 | /* see if a signal did it */ | |
1202 | if (signal_pending(current)) { | |
1203 | ret = -ERESTARTSYS; | |
1204 | break; | |
1205 | } | |
1206 | ||
1207 | cprev = cnow; | |
1208 | } | |
97f9f707 | 1209 | __set_current_state(TASK_RUNNING); |
bdc04e31 | 1210 | remove_wait_queue(&port->delta_msr_wait, &wait); |
9ed19428 | 1211 | uart_port_deref(uport); |
1da177e4 LT |
1212 | |
1213 | return ret; | |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1218 | * Return: write counters to the user passed counter struct | |
1219 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1220 | * RI where only 0->1 is counted. | |
1221 | */ | |
d281da7f AC |
1222 | static int uart_get_icount(struct tty_struct *tty, |
1223 | struct serial_icounter_struct *icount) | |
1da177e4 | 1224 | { |
d281da7f | 1225 | struct uart_state *state = tty->driver_data; |
1da177e4 | 1226 | struct uart_icount cnow; |
9ed19428 | 1227 | struct uart_port *uport; |
1da177e4 | 1228 | |
9ed19428 PH |
1229 | uport = uart_port_ref(state); |
1230 | if (!uport) | |
1231 | return -EIO; | |
46d57a44 AC |
1232 | spin_lock_irq(&uport->lock); |
1233 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1234 | spin_unlock_irq(&uport->lock); | |
9ed19428 | 1235 | uart_port_deref(uport); |
1da177e4 | 1236 | |
d281da7f AC |
1237 | icount->cts = cnow.cts; |
1238 | icount->dsr = cnow.dsr; | |
1239 | icount->rng = cnow.rng; | |
1240 | icount->dcd = cnow.dcd; | |
1241 | icount->rx = cnow.rx; | |
1242 | icount->tx = cnow.tx; | |
1243 | icount->frame = cnow.frame; | |
1244 | icount->overrun = cnow.overrun; | |
1245 | icount->parity = cnow.parity; | |
1246 | icount->brk = cnow.brk; | |
1247 | icount->buf_overrun = cnow.buf_overrun; | |
1248 | ||
1249 | return 0; | |
1da177e4 LT |
1250 | } |
1251 | ||
a5f276f1 RRD |
1252 | static int uart_get_rs485_config(struct uart_port *port, |
1253 | struct serial_rs485 __user *rs485) | |
1254 | { | |
bd737f87 RRD |
1255 | unsigned long flags; |
1256 | struct serial_rs485 aux; | |
1257 | ||
1258 | spin_lock_irqsave(&port->lock, flags); | |
1259 | aux = port->rs485; | |
1260 | spin_unlock_irqrestore(&port->lock, flags); | |
1261 | ||
1262 | if (copy_to_user(rs485, &aux, sizeof(aux))) | |
a5f276f1 | 1263 | return -EFAULT; |
bd737f87 | 1264 | |
a5f276f1 RRD |
1265 | return 0; |
1266 | } | |
1267 | ||
1268 | static int uart_set_rs485_config(struct uart_port *port, | |
1269 | struct serial_rs485 __user *rs485_user) | |
1270 | { | |
1271 | struct serial_rs485 rs485; | |
1272 | int ret; | |
bd737f87 | 1273 | unsigned long flags; |
a5f276f1 RRD |
1274 | |
1275 | if (!port->rs485_config) | |
1276 | return -ENOIOCTLCMD; | |
1277 | ||
1278 | if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) | |
1279 | return -EFAULT; | |
1280 | ||
bd737f87 | 1281 | spin_lock_irqsave(&port->lock, flags); |
a5f276f1 | 1282 | ret = port->rs485_config(port, &rs485); |
bd737f87 | 1283 | spin_unlock_irqrestore(&port->lock, flags); |
a5f276f1 RRD |
1284 | if (ret) |
1285 | return ret; | |
1286 | ||
1287 | if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) | |
1288 | return -EFAULT; | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1da177e4 | 1293 | /* |
e5238442 | 1294 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1295 | */ |
1296 | static int | |
4047b371 | 1297 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
1298 | { |
1299 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1300 | struct tty_port *port = &state->port; |
4047b371 | 1301 | struct uart_port *uport; |
1da177e4 LT |
1302 | void __user *uarg = (void __user *)arg; |
1303 | int ret = -ENOIOCTLCMD; | |
1304 | ||
1da177e4 LT |
1305 | |
1306 | /* | |
1307 | * These ioctls don't rely on the hardware to be present. | |
1308 | */ | |
1309 | switch (cmd) { | |
1310 | case TIOCGSERIAL: | |
9f109694 | 1311 | ret = uart_get_info_user(port, uarg); |
1da177e4 LT |
1312 | break; |
1313 | ||
1314 | case TIOCSSERIAL: | |
7c8ab967 | 1315 | down_write(&tty->termios_rwsem); |
7ba2e769 | 1316 | ret = uart_set_info_user(tty, state, uarg); |
7c8ab967 | 1317 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
1318 | break; |
1319 | ||
1320 | case TIOCSERCONFIG: | |
7c8ab967 | 1321 | down_write(&tty->termios_rwsem); |
19225135 | 1322 | ret = uart_do_autoconfig(tty, state); |
7c8ab967 | 1323 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
1324 | break; |
1325 | ||
1326 | case TIOCSERGWILD: /* obsolete */ | |
1327 | case TIOCSERSWILD: /* obsolete */ | |
1328 | ret = 0; | |
1329 | break; | |
1330 | } | |
1331 | ||
1332 | if (ret != -ENOIOCTLCMD) | |
1333 | goto out; | |
1334 | ||
18900ca6 | 1335 | if (tty_io_error(tty)) { |
1da177e4 LT |
1336 | ret = -EIO; |
1337 | goto out; | |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * The following should only be used when hardware is present. | |
1342 | */ | |
1343 | switch (cmd) { | |
1344 | case TIOCMIWAIT: | |
1345 | ret = uart_wait_modem_status(state, arg); | |
1346 | break; | |
1da177e4 LT |
1347 | } |
1348 | ||
1349 | if (ret != -ENOIOCTLCMD) | |
1350 | goto out; | |
1351 | ||
a2bceae0 | 1352 | mutex_lock(&port->mutex); |
4047b371 | 1353 | uport = uart_port_check(state); |
1da177e4 | 1354 | |
4047b371 | 1355 | if (!uport || tty_io_error(tty)) { |
1da177e4 LT |
1356 | ret = -EIO; |
1357 | goto out_up; | |
1358 | } | |
1359 | ||
1360 | /* | |
1361 | * All these rely on hardware being present and need to be | |
1362 | * protected against the tty being hung up. | |
1363 | */ | |
a9c20a9c | 1364 | |
1da177e4 | 1365 | switch (cmd) { |
a9c20a9c RRD |
1366 | case TIOCSERGETLSR: /* Get line status register */ |
1367 | ret = uart_get_lsr_info(tty, state, uarg); | |
1368 | break; | |
1369 | ||
a5f276f1 | 1370 | case TIOCGRS485: |
4047b371 | 1371 | ret = uart_get_rs485_config(uport, uarg); |
a5f276f1 RRD |
1372 | break; |
1373 | ||
1374 | case TIOCSRS485: | |
4047b371 | 1375 | ret = uart_set_rs485_config(uport, uarg); |
a5f276f1 | 1376 | break; |
4047b371 | 1377 | default: |
46d57a44 AC |
1378 | if (uport->ops->ioctl) |
1379 | ret = uport->ops->ioctl(uport, cmd, arg); | |
1da177e4 LT |
1380 | break; |
1381 | } | |
f34d7a5b | 1382 | out_up: |
a2bceae0 | 1383 | mutex_unlock(&port->mutex); |
f34d7a5b | 1384 | out: |
1da177e4 LT |
1385 | return ret; |
1386 | } | |
1387 | ||
edeb280e | 1388 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1389 | { |
1390 | struct uart_state *state = tty->driver_data; | |
4047b371 | 1391 | struct uart_port *uport; |
64e9159f | 1392 | |
4047b371 PH |
1393 | mutex_lock(&state->port.mutex); |
1394 | uport = uart_port_check(state); | |
1395 | if (uport && uport->ops->set_ldisc) | |
732a84a0 | 1396 | uport->ops->set_ldisc(uport, &tty->termios); |
4047b371 | 1397 | mutex_unlock(&state->port.mutex); |
64e9159f AC |
1398 | } |
1399 | ||
a46c9994 AC |
1400 | static void uart_set_termios(struct tty_struct *tty, |
1401 | struct ktermios *old_termios) | |
1da177e4 LT |
1402 | { |
1403 | struct uart_state *state = tty->driver_data; | |
4047b371 | 1404 | struct uart_port *uport; |
adc8d746 | 1405 | unsigned int cflag = tty->termios.c_cflag; |
2cbacafd RK |
1406 | unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; |
1407 | bool sw_changed = false; | |
1da177e4 | 1408 | |
4047b371 PH |
1409 | mutex_lock(&state->port.mutex); |
1410 | uport = uart_port_check(state); | |
1411 | if (!uport) | |
1412 | goto out; | |
1413 | ||
2cbacafd RK |
1414 | /* |
1415 | * Drivers doing software flow control also need to know | |
1416 | * about changes to these input settings. | |
1417 | */ | |
1418 | if (uport->flags & UPF_SOFT_FLOW) { | |
1419 | iflag_mask |= IXANY|IXON|IXOFF; | |
1420 | sw_changed = | |
1421 | tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || | |
1422 | tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; | |
1423 | } | |
1da177e4 LT |
1424 | |
1425 | /* | |
1426 | * These are the bits that are used to setup various | |
20620d68 DW |
1427 | * flags in the low level driver. We can ignore the Bfoo |
1428 | * bits in c_cflag; c_[io]speed will always be set | |
1429 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 | 1430 | */ |
1da177e4 | 1431 | if ((cflag ^ old_termios->c_cflag) == 0 && |
adc8d746 AC |
1432 | tty->termios.c_ospeed == old_termios->c_ospeed && |
1433 | tty->termios.c_ispeed == old_termios->c_ispeed && | |
2cbacafd RK |
1434 | ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && |
1435 | !sw_changed) { | |
4047b371 | 1436 | goto out; |
e5238442 | 1437 | } |
1da177e4 | 1438 | |
19225135 | 1439 | uart_change_speed(tty, state, old_termios); |
c18b55fd PH |
1440 | /* reload cflag from termios; port driver may have overriden flags */ |
1441 | cflag = tty->termios.c_cflag; | |
1da177e4 LT |
1442 | |
1443 | /* Handle transition to B0 status */ | |
1444 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
dec94e70 | 1445 | uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 1446 | /* Handle transition away from B0 status */ |
82cb7ba1 | 1447 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 | 1448 | unsigned int mask = TIOCM_DTR; |
97ef38b8 | 1449 | if (!(cflag & CRTSCTS) || !tty_throttled(tty)) |
1da177e4 | 1450 | mask |= TIOCM_RTS; |
dec94e70 | 1451 | uart_set_mctrl(uport, mask); |
1da177e4 | 1452 | } |
4047b371 PH |
1453 | out: |
1454 | mutex_unlock(&state->port.mutex); | |
1da177e4 LT |
1455 | } |
1456 | ||
1457 | /* | |
ef4f527c KC |
1458 | * Calls to uart_close() are serialised via the tty_lock in |
1459 | * drivers/tty/tty_io.c:tty_release() | |
1460 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1da177e4 LT |
1461 | */ |
1462 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1463 | { | |
1464 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1465 | struct tty_port *port; |
a46c9994 | 1466 | |
91b32f54 PH |
1467 | if (!state) { |
1468 | struct uart_driver *drv = tty->driver->driver_state; | |
1469 | ||
1470 | state = drv->state + tty->index; | |
1471 | port = &state->port; | |
1472 | spin_lock_irq(&port->lock); | |
1473 | --port->count; | |
1474 | spin_unlock_irq(&port->lock); | |
eea7e17e | 1475 | return; |
91b32f54 | 1476 | } |
eea7e17e | 1477 | |
46d57a44 | 1478 | port = &state->port; |
39b3d892 | 1479 | pr_debug("uart_close(%d) called\n", tty->index); |
1da177e4 | 1480 | |
761ed4a9 RH |
1481 | tty_port_close(tty->port, tty, filp); |
1482 | } | |
1da177e4 | 1483 | |
761ed4a9 RH |
1484 | static void uart_tty_port_shutdown(struct tty_port *port) |
1485 | { | |
1486 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1487 | struct uart_port *uport = uart_port_check(state); | |
af224ca2 | 1488 | |
1da177e4 LT |
1489 | /* |
1490 | * At this point, we stop accepting input. To do this, we | |
1491 | * disable the receive line status interrupts. | |
1492 | */ | |
a5a2b130 AS |
1493 | if (WARN(!uport, "detached port still initialized!\n")) |
1494 | return; | |
1da177e4 | 1495 | |
a5a2b130 | 1496 | spin_lock_irq(&uport->lock); |
761ed4a9 | 1497 | uport->ops->stop_rx(uport); |
761ed4a9 | 1498 | spin_unlock_irq(&uport->lock); |
1da177e4 | 1499 | |
761ed4a9 | 1500 | uart_port_shutdown(port); |
1da177e4 LT |
1501 | |
1502 | /* | |
761ed4a9 RH |
1503 | * It's possible for shutdown to be called after suspend if we get |
1504 | * a DCD drop (hangup) at just the right time. Clear suspended bit so | |
1505 | * we don't try to resume a port that has been shutdown. | |
1da177e4 | 1506 | */ |
761ed4a9 | 1507 | tty_port_set_suspended(port, 0); |
1da177e4 | 1508 | |
761ed4a9 | 1509 | uart_change_pm(state, UART_PM_STATE_OFF); |
2e758910 | 1510 | |
1da177e4 LT |
1511 | } |
1512 | ||
1f33a51d | 1513 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
1da177e4 | 1514 | { |
1f33a51d | 1515 | struct uart_state *state = tty->driver_data; |
9ed19428 | 1516 | struct uart_port *port; |
1da177e4 LT |
1517 | unsigned long char_time, expire; |
1518 | ||
9ed19428 | 1519 | port = uart_port_ref(state); |
ef510bea AS |
1520 | if (!port) |
1521 | return; | |
1522 | ||
1523 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) { | |
9ed19428 | 1524 | uart_port_deref(port); |
1da177e4 | 1525 | return; |
9ed19428 | 1526 | } |
1da177e4 LT |
1527 | |
1528 | /* | |
1529 | * Set the check interval to be 1/5 of the estimated time to | |
1530 | * send a single character, and make it at least 1. The check | |
1531 | * interval should also be less than the timeout. | |
1532 | * | |
1533 | * Note: we have to use pretty tight timings here to satisfy | |
1534 | * the NIST-PCTS. | |
1535 | */ | |
1536 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1537 | char_time = char_time / 5; | |
1538 | if (char_time == 0) | |
1539 | char_time = 1; | |
1540 | if (timeout && timeout < char_time) | |
1541 | char_time = timeout; | |
1542 | ||
1543 | /* | |
1544 | * If the transmitter hasn't cleared in twice the approximate | |
1545 | * amount of time to send the entire FIFO, it probably won't | |
1546 | * ever clear. This assumes the UART isn't doing flow | |
1547 | * control, which is currently the case. Hence, if it ever | |
1548 | * takes longer than port->timeout, this is probably due to a | |
1549 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1550 | * 2*port->timeout. | |
1551 | */ | |
1552 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1553 | timeout = 2 * port->timeout; | |
1554 | ||
1555 | expire = jiffies + timeout; | |
1556 | ||
eb3a1e11 | 1557 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1558 | port->line, jiffies, expire); |
1da177e4 LT |
1559 | |
1560 | /* | |
1561 | * Check whether the transmitter is empty every 'char_time'. | |
1562 | * 'timeout' / 'expire' give us the maximum amount of time | |
1563 | * we wait. | |
1564 | */ | |
1565 | while (!port->ops->tx_empty(port)) { | |
1566 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1567 | if (signal_pending(current)) | |
1568 | break; | |
1569 | if (time_after(jiffies, expire)) | |
1570 | break; | |
1571 | } | |
9ed19428 | 1572 | uart_port_deref(port); |
20365219 AB |
1573 | } |
1574 | ||
1da177e4 | 1575 | /* |
ef4f527c KC |
1576 | * Calls to uart_hangup() are serialised by the tty_lock in |
1577 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1578 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1579 | */ |
1580 | static void uart_hangup(struct tty_struct *tty) | |
1581 | { | |
1582 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1583 | struct tty_port *port = &state->port; |
af224ca2 | 1584 | struct uart_port *uport; |
61cd8a21 | 1585 | unsigned long flags; |
1da177e4 | 1586 | |
39b3d892 | 1587 | pr_debug("uart_hangup(%d)\n", tty->index); |
1da177e4 | 1588 | |
a2bceae0 | 1589 | mutex_lock(&port->mutex); |
af224ca2 PH |
1590 | uport = uart_port_check(state); |
1591 | WARN(!uport, "hangup of detached port!\n"); | |
1592 | ||
807c8d81 | 1593 | if (tty_port_active(port)) { |
1da177e4 | 1594 | uart_flush_buffer(tty); |
19225135 | 1595 | uart_shutdown(tty, state); |
61cd8a21 | 1596 | spin_lock_irqsave(&port->lock, flags); |
91312cdb | 1597 | port->count = 0; |
61cd8a21 | 1598 | spin_unlock_irqrestore(&port->lock, flags); |
807c8d81 | 1599 | tty_port_set_active(port, 0); |
7b01478f | 1600 | tty_port_tty_set(port, NULL); |
af224ca2 | 1601 | if (uport && !uart_console(uport)) |
bf903c0c | 1602 | uart_change_pm(state, UART_PM_STATE_OFF); |
46d57a44 | 1603 | wake_up_interruptible(&port->open_wait); |
bdc04e31 | 1604 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 | 1605 | } |
a2bceae0 | 1606 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1607 | } |
1608 | ||
af224ca2 | 1609 | /* uport == NULL if uart_port has already been removed */ |
0b1db830 JS |
1610 | static void uart_port_shutdown(struct tty_port *port) |
1611 | { | |
b922e19d | 1612 | struct uart_state *state = container_of(port, struct uart_state, port); |
4047b371 | 1613 | struct uart_port *uport = uart_port_check(state); |
b922e19d JS |
1614 | |
1615 | /* | |
1616 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
1617 | * the irq here so the queue might never be woken up. Note | |
1618 | * that we won't end up waiting on delta_msr_wait again since | |
1619 | * any outstanding file descriptors should be pointing at | |
1620 | * hung_up_tty_fops now. | |
1621 | */ | |
1622 | wake_up_interruptible(&port->delta_msr_wait); | |
1623 | ||
1624 | /* | |
1625 | * Free the IRQ and disable the port. | |
1626 | */ | |
af224ca2 PH |
1627 | if (uport) |
1628 | uport->ops->shutdown(uport); | |
b922e19d JS |
1629 | |
1630 | /* | |
1631 | * Ensure that the IRQ handler isn't running on another CPU. | |
1632 | */ | |
af224ca2 PH |
1633 | if (uport) |
1634 | synchronize_irq(uport->irq); | |
0b1db830 JS |
1635 | } |
1636 | ||
de0c8cb3 AC |
1637 | static int uart_carrier_raised(struct tty_port *port) |
1638 | { | |
1639 | struct uart_state *state = container_of(port, struct uart_state, port); | |
9ed19428 | 1640 | struct uart_port *uport; |
de0c8cb3 | 1641 | int mctrl; |
9ed19428 PH |
1642 | |
1643 | uport = uart_port_ref(state); | |
1644 | /* | |
1645 | * Should never observe uport == NULL since checks for hangup should | |
1646 | * abort the tty_port_block_til_ready() loop before checking for carrier | |
1647 | * raised -- but report carrier raised if it does anyway so open will | |
1648 | * continue and not sleep | |
1649 | */ | |
1650 | if (WARN_ON(!uport)) | |
1651 | return 1; | |
de0c8cb3 | 1652 | spin_lock_irq(&uport->lock); |
1fdc3106 | 1653 | uart_enable_ms(uport); |
de0c8cb3 AC |
1654 | mctrl = uport->ops->get_mctrl(uport); |
1655 | spin_unlock_irq(&uport->lock); | |
9ed19428 | 1656 | uart_port_deref(uport); |
de0c8cb3 AC |
1657 | if (mctrl & TIOCM_CAR) |
1658 | return 1; | |
1659 | return 0; | |
1660 | } | |
1661 | ||
1662 | static void uart_dtr_rts(struct tty_port *port, int onoff) | |
1663 | { | |
1664 | struct uart_state *state = container_of(port, struct uart_state, port); | |
9ed19428 PH |
1665 | struct uart_port *uport; |
1666 | ||
1667 | uport = uart_port_ref(state); | |
1668 | if (!uport) | |
1669 | return; | |
24fcc7c8 | 1670 | |
6f5c24ad | 1671 | if (onoff) |
de0c8cb3 AC |
1672 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
1673 | else | |
1674 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); | |
9ed19428 PH |
1675 | |
1676 | uart_port_deref(uport); | |
de0c8cb3 AC |
1677 | } |
1678 | ||
1da177e4 | 1679 | /* |
ef4f527c KC |
1680 | * Calls to uart_open are serialised by the tty_lock in |
1681 | * drivers/tty/tty_io.c:tty_open() | |
1da177e4 LT |
1682 | * Note that if this fails, then uart_close() _will_ be called. |
1683 | * | |
1684 | * In time, we want to scrap the "opening nonpresent ports" | |
1685 | * behaviour and implement an alternative way for setserial | |
1686 | * to set base addresses/ports/types. This will allow us to | |
1687 | * get rid of a certain amount of extra tests. | |
1688 | */ | |
1689 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1690 | { | |
5e388027 | 1691 | struct uart_driver *drv = tty->driver->driver_state; |
1da177e4 | 1692 | int retval, line = tty->index; |
1c7b13c4 | 1693 | struct uart_state *state = drv->state + line; |
1da177e4 | 1694 | |
b3b57646 | 1695 | tty->driver_data = state; |
1da177e4 | 1696 | |
b3b57646 RH |
1697 | retval = tty_port_open(&state->port, tty, filp); |
1698 | if (retval > 0) | |
1699 | retval = 0; | |
91b32f54 | 1700 | |
b3b57646 RH |
1701 | return retval; |
1702 | } | |
1703 | ||
1704 | static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) | |
1705 | { | |
1706 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1707 | struct uart_port *uport; | |
1c7b13c4 | 1708 | |
4047b371 | 1709 | uport = uart_port_check(state); |
b3b57646 RH |
1710 | if (!uport || uport->flags & UPF_DEAD) |
1711 | return -ENXIO; | |
1da177e4 | 1712 | |
4047b371 | 1713 | port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
1da177e4 | 1714 | |
1da177e4 LT |
1715 | /* |
1716 | * Start up the serial port. | |
1717 | */ | |
b3b57646 | 1718 | return uart_startup(tty, state, 0); |
1da177e4 LT |
1719 | } |
1720 | ||
1721 | static const char *uart_type(struct uart_port *port) | |
1722 | { | |
1723 | const char *str = NULL; | |
1724 | ||
1725 | if (port->ops->type) | |
1726 | str = port->ops->type(port); | |
1727 | ||
1728 | if (!str) | |
1729 | str = "unknown"; | |
1730 | ||
1731 | return str; | |
1732 | } | |
1733 | ||
1734 | #ifdef CONFIG_PROC_FS | |
1735 | ||
d196a949 | 1736 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1da177e4 LT |
1737 | { |
1738 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 1739 | struct tty_port *port = &state->port; |
6f538fe3 | 1740 | enum uart_pm_state pm_state; |
4047b371 | 1741 | struct uart_port *uport; |
1da177e4 LT |
1742 | char stat_buf[32]; |
1743 | unsigned int status; | |
d196a949 | 1744 | int mmio; |
1da177e4 | 1745 | |
4047b371 PH |
1746 | mutex_lock(&port->mutex); |
1747 | uport = uart_port_check(state); | |
a2bceae0 | 1748 | if (!uport) |
4047b371 | 1749 | goto out; |
1da177e4 | 1750 | |
a2bceae0 | 1751 | mmio = uport->iotype >= UPIO_MEM; |
d196a949 | 1752 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
a2bceae0 | 1753 | uport->line, uart_type(uport), |
6c6a2334 | 1754 | mmio ? "mmio:0x" : "port:", |
a2bceae0 AC |
1755 | mmio ? (unsigned long long)uport->mapbase |
1756 | : (unsigned long long)uport->iobase, | |
1757 | uport->irq); | |
1da177e4 | 1758 | |
a2bceae0 | 1759 | if (uport->type == PORT_UNKNOWN) { |
d196a949 | 1760 | seq_putc(m, '\n'); |
4047b371 | 1761 | goto out; |
1da177e4 LT |
1762 | } |
1763 | ||
a46c9994 | 1764 | if (capable(CAP_SYS_ADMIN)) { |
3689a0ec | 1765 | pm_state = state->pm_state; |
6f538fe3 LW |
1766 | if (pm_state != UART_PM_STATE_ON) |
1767 | uart_change_pm(state, UART_PM_STATE_ON); | |
a2bceae0 AC |
1768 | spin_lock_irq(&uport->lock); |
1769 | status = uport->ops->get_mctrl(uport); | |
1770 | spin_unlock_irq(&uport->lock); | |
6f538fe3 | 1771 | if (pm_state != UART_PM_STATE_ON) |
3689a0ec | 1772 | uart_change_pm(state, pm_state); |
1da177e4 | 1773 | |
d196a949 | 1774 | seq_printf(m, " tx:%d rx:%d", |
a2bceae0 AC |
1775 | uport->icount.tx, uport->icount.rx); |
1776 | if (uport->icount.frame) | |
968af298 | 1777 | seq_printf(m, " fe:%d", uport->icount.frame); |
a2bceae0 | 1778 | if (uport->icount.parity) |
968af298 | 1779 | seq_printf(m, " pe:%d", uport->icount.parity); |
a2bceae0 | 1780 | if (uport->icount.brk) |
968af298 | 1781 | seq_printf(m, " brk:%d", uport->icount.brk); |
a2bceae0 | 1782 | if (uport->icount.overrun) |
968af298 | 1783 | seq_printf(m, " oe:%d", uport->icount.overrun); |
a46c9994 AC |
1784 | |
1785 | #define INFOBIT(bit, str) \ | |
a2bceae0 | 1786 | if (uport->mctrl & (bit)) \ |
1da177e4 LT |
1787 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1788 | strlen(stat_buf) - 2) | |
a46c9994 | 1789 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1790 | if (status & (bit)) \ |
1791 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1792 | strlen(stat_buf) - 2) | |
1793 | ||
1794 | stat_buf[0] = '\0'; | |
1795 | stat_buf[1] = '\0'; | |
1796 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1797 | STATBIT(TIOCM_CTS, "|CTS"); | |
1798 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1799 | STATBIT(TIOCM_DSR, "|DSR"); | |
1800 | STATBIT(TIOCM_CAR, "|CD"); | |
1801 | STATBIT(TIOCM_RNG, "|RI"); | |
1802 | if (stat_buf[0]) | |
1803 | stat_buf[0] = ' '; | |
a46c9994 | 1804 | |
d196a949 | 1805 | seq_puts(m, stat_buf); |
1da177e4 | 1806 | } |
d196a949 | 1807 | seq_putc(m, '\n'); |
1da177e4 LT |
1808 | #undef STATBIT |
1809 | #undef INFOBIT | |
4047b371 PH |
1810 | out: |
1811 | mutex_unlock(&port->mutex); | |
1da177e4 LT |
1812 | } |
1813 | ||
d196a949 | 1814 | static int uart_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1815 | { |
833bb304 | 1816 | struct tty_driver *ttydrv = m->private; |
1da177e4 | 1817 | struct uart_driver *drv = ttydrv->driver_state; |
d196a949 | 1818 | int i; |
1da177e4 | 1819 | |
968af298 | 1820 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); |
d196a949 AD |
1821 | for (i = 0; i < drv->nr; i++) |
1822 | uart_line_info(m, drv, i); | |
1823 | return 0; | |
1da177e4 | 1824 | } |
d196a949 AD |
1825 | |
1826 | static int uart_proc_open(struct inode *inode, struct file *file) | |
1827 | { | |
d9dda78b | 1828 | return single_open(file, uart_proc_show, PDE_DATA(inode)); |
d196a949 AD |
1829 | } |
1830 | ||
1831 | static const struct file_operations uart_proc_fops = { | |
1832 | .owner = THIS_MODULE, | |
1833 | .open = uart_proc_open, | |
1834 | .read = seq_read, | |
1835 | .llseek = seq_lseek, | |
1836 | .release = single_release, | |
1837 | }; | |
1da177e4 LT |
1838 | #endif |
1839 | ||
4a1b5502 | 1840 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
1cfe42b7 | 1841 | /** |
d358788f RK |
1842 | * uart_console_write - write a console message to a serial port |
1843 | * @port: the port to write the message | |
1844 | * @s: array of characters | |
1845 | * @count: number of characters in string to write | |
10afbe34 | 1846 | * @putchar: function to write character to port |
d358788f RK |
1847 | */ |
1848 | void uart_console_write(struct uart_port *port, const char *s, | |
1849 | unsigned int count, | |
1850 | void (*putchar)(struct uart_port *, int)) | |
1851 | { | |
1852 | unsigned int i; | |
1853 | ||
1854 | for (i = 0; i < count; i++, s++) { | |
1855 | if (*s == '\n') | |
1856 | putchar(port, '\r'); | |
1857 | putchar(port, *s); | |
1858 | } | |
1859 | } | |
1860 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1861 | ||
1da177e4 LT |
1862 | /* |
1863 | * Check whether an invalid uart number has been specified, and | |
1864 | * if so, search for the first available port that does have | |
1865 | * console support. | |
1866 | */ | |
1867 | struct uart_port * __init | |
1868 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1869 | { | |
1870 | int idx = co->index; | |
1871 | ||
1872 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1873 | ports[idx].membase == NULL)) | |
1874 | for (idx = 0; idx < nr; idx++) | |
1875 | if (ports[idx].iobase != 0 || | |
1876 | ports[idx].membase != NULL) | |
1877 | break; | |
1878 | ||
1879 | co->index = idx; | |
1880 | ||
1881 | return ports + idx; | |
1882 | } | |
1883 | ||
73abaf87 PH |
1884 | /** |
1885 | * uart_parse_earlycon - Parse earlycon options | |
1886 | * @p: ptr to 2nd field (ie., just beyond '<name>,') | |
1887 | * @iotype: ptr for decoded iotype (out) | |
1888 | * @addr: ptr for decoded mapbase/iobase (out) | |
1889 | * @options: ptr for <options> field; NULL if not present (out) | |
1890 | * | |
1891 | * Decodes earlycon kernel command line parameters of the form | |
bd94c407 MY |
1892 | * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> |
1893 | * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> | |
73abaf87 PH |
1894 | * |
1895 | * The optional form | |
1896 | * earlycon=<name>,0x<addr>,<options> | |
1897 | * console=<name>,0x<addr>,<options> | |
1898 | * is also accepted; the returned @iotype will be UPIO_MEM. | |
1899 | * | |
8b2303de | 1900 | * Returns 0 on success or -EINVAL on failure |
73abaf87 | 1901 | */ |
46e36683 | 1902 | int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, |
73abaf87 PH |
1903 | char **options) |
1904 | { | |
1905 | if (strncmp(p, "mmio,", 5) == 0) { | |
1906 | *iotype = UPIO_MEM; | |
1907 | p += 5; | |
bd94c407 MY |
1908 | } else if (strncmp(p, "mmio16,", 7) == 0) { |
1909 | *iotype = UPIO_MEM16; | |
1910 | p += 7; | |
73abaf87 PH |
1911 | } else if (strncmp(p, "mmio32,", 7) == 0) { |
1912 | *iotype = UPIO_MEM32; | |
1913 | p += 7; | |
6e63be3f NC |
1914 | } else if (strncmp(p, "mmio32be,", 9) == 0) { |
1915 | *iotype = UPIO_MEM32BE; | |
1916 | p += 9; | |
d215d809 MF |
1917 | } else if (strncmp(p, "mmio32native,", 13) == 0) { |
1918 | *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? | |
1919 | UPIO_MEM32BE : UPIO_MEM32; | |
1920 | p += 13; | |
73abaf87 PH |
1921 | } else if (strncmp(p, "io,", 3) == 0) { |
1922 | *iotype = UPIO_PORT; | |
1923 | p += 3; | |
1924 | } else if (strncmp(p, "0x", 2) == 0) { | |
1925 | *iotype = UPIO_MEM; | |
1926 | } else { | |
1927 | return -EINVAL; | |
1928 | } | |
1929 | ||
8b2303de AS |
1930 | /* |
1931 | * Before you replace it with kstrtoull(), think about options separator | |
1932 | * (',') it will not tolerate | |
1933 | */ | |
1934 | *addr = simple_strtoull(p, NULL, 0); | |
73abaf87 PH |
1935 | p = strchr(p, ','); |
1936 | if (p) | |
1937 | p++; | |
1938 | ||
1939 | *options = p; | |
1940 | return 0; | |
1941 | } | |
1942 | EXPORT_SYMBOL_GPL(uart_parse_earlycon); | |
1943 | ||
1da177e4 | 1944 | /** |
02088ca6 | 1945 | * uart_parse_options - Parse serial port baud/parity/bits/flow control. |
1da177e4 LT |
1946 | * @options: pointer to option string |
1947 | * @baud: pointer to an 'int' variable for the baud rate. | |
1948 | * @parity: pointer to an 'int' variable for the parity. | |
1949 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1950 | * @flow: pointer to an 'int' variable for the flow control character. | |
1951 | * | |
1952 | * uart_parse_options decodes a string containing the serial console | |
1953 | * options. The format of the string is <baud><parity><bits><flow>, | |
1954 | * eg: 115200n8r | |
1955 | */ | |
f2d937f3 | 1956 | void |
1da177e4 LT |
1957 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1958 | { | |
1959 | char *s = options; | |
1960 | ||
1961 | *baud = simple_strtoul(s, NULL, 10); | |
1962 | while (*s >= '0' && *s <= '9') | |
1963 | s++; | |
1964 | if (*s) | |
1965 | *parity = *s++; | |
1966 | if (*s) | |
1967 | *bits = *s++ - '0'; | |
1968 | if (*s) | |
1969 | *flow = *s; | |
1970 | } | |
f2d937f3 | 1971 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 | 1972 | |
1da177e4 LT |
1973 | /** |
1974 | * uart_set_options - setup the serial console parameters | |
1975 | * @port: pointer to the serial ports uart_port structure | |
1976 | * @co: console pointer | |
1977 | * @baud: baud rate | |
1978 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1979 | * @bits: number of data bits | |
1980 | * @flow: flow control character - 'r' (rts) | |
1981 | */ | |
f2d937f3 | 1982 | int |
1da177e4 LT |
1983 | uart_set_options(struct uart_port *port, struct console *co, |
1984 | int baud, int parity, int bits, int flow) | |
1985 | { | |
606d099c | 1986 | struct ktermios termios; |
149b36ea | 1987 | static struct ktermios dummy; |
1da177e4 | 1988 | |
976ecd12 RK |
1989 | /* |
1990 | * Ensure that the serial console lock is initialised | |
1991 | * early. | |
42b6a1ba RW |
1992 | * If this port is a console, then the spinlock is already |
1993 | * initialised. | |
976ecd12 | 1994 | */ |
42b6a1ba RW |
1995 | if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { |
1996 | spin_lock_init(&port->lock); | |
1997 | lockdep_set_class(&port->lock, &port_lock_key); | |
1998 | } | |
976ecd12 | 1999 | |
606d099c | 2000 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 | 2001 | |
ba47f97a JC |
2002 | termios.c_cflag |= CREAD | HUPCL | CLOCAL; |
2003 | tty_termios_encode_baud_rate(&termios, baud, baud); | |
1da177e4 LT |
2004 | |
2005 | if (bits == 7) | |
2006 | termios.c_cflag |= CS7; | |
2007 | else | |
2008 | termios.c_cflag |= CS8; | |
2009 | ||
2010 | switch (parity) { | |
2011 | case 'o': case 'O': | |
2012 | termios.c_cflag |= PARODD; | |
2013 | /*fall through*/ | |
2014 | case 'e': case 'E': | |
2015 | termios.c_cflag |= PARENB; | |
2016 | break; | |
2017 | } | |
2018 | ||
2019 | if (flow == 'r') | |
2020 | termios.c_cflag |= CRTSCTS; | |
2021 | ||
79492689 YL |
2022 | /* |
2023 | * some uarts on other side don't support no flow control. | |
2024 | * So we set * DTR in host uart to make them happy | |
2025 | */ | |
2026 | port->mctrl |= TIOCM_DTR; | |
2027 | ||
149b36ea | 2028 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
2029 | /* |
2030 | * Allow the setting of the UART parameters with a NULL console | |
2031 | * too: | |
2032 | */ | |
2033 | if (co) | |
2034 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
2035 | |
2036 | return 0; | |
2037 | } | |
f2d937f3 | 2038 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
2039 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
2040 | ||
cf75525f JS |
2041 | /** |
2042 | * uart_change_pm - set power state of the port | |
2043 | * | |
2044 | * @state: port descriptor | |
2045 | * @pm_state: new state | |
2046 | * | |
2047 | * Locking: port->mutex has to be held | |
2048 | */ | |
6f538fe3 LW |
2049 | static void uart_change_pm(struct uart_state *state, |
2050 | enum uart_pm_state pm_state) | |
1da177e4 | 2051 | { |
4047b371 | 2052 | struct uart_port *port = uart_port_check(state); |
1281e360 AV |
2053 | |
2054 | if (state->pm_state != pm_state) { | |
4047b371 | 2055 | if (port && port->ops->pm) |
1281e360 AV |
2056 | port->ops->pm(port, pm_state, state->pm_state); |
2057 | state->pm_state = pm_state; | |
2058 | } | |
1da177e4 LT |
2059 | } |
2060 | ||
b3b708fa GL |
2061 | struct uart_match { |
2062 | struct uart_port *port; | |
2063 | struct uart_driver *driver; | |
2064 | }; | |
2065 | ||
2066 | static int serial_match_port(struct device *dev, void *data) | |
2067 | { | |
2068 | struct uart_match *match = data; | |
7ca796f4 GL |
2069 | struct tty_driver *tty_drv = match->driver->tty_driver; |
2070 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
2071 | match->port->line; | |
b3b708fa GL |
2072 | |
2073 | return dev->devt == devt; /* Actually, only one tty per port */ | |
2074 | } | |
2075 | ||
ccce6deb | 2076 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2077 | { |
ccce6deb AC |
2078 | struct uart_state *state = drv->state + uport->line; |
2079 | struct tty_port *port = &state->port; | |
b3b708fa | 2080 | struct device *tty_dev; |
ccce6deb | 2081 | struct uart_match match = {uport, drv}; |
1da177e4 | 2082 | |
a2bceae0 | 2083 | mutex_lock(&port->mutex); |
1da177e4 | 2084 | |
ccce6deb | 2085 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
88e2582e | 2086 | if (tty_dev && device_may_wakeup(tty_dev)) { |
3f960dbb G |
2087 | if (!enable_irq_wake(uport->irq)) |
2088 | uport->irq_wake = 1; | |
b3b708fa | 2089 | put_device(tty_dev); |
a2bceae0 | 2090 | mutex_unlock(&port->mutex); |
b3b708fa GL |
2091 | return 0; |
2092 | } | |
5a65dcc0 FV |
2093 | put_device(tty_dev); |
2094 | ||
b164c972 PH |
2095 | /* Nothing to do if the console is not suspending */ |
2096 | if (!console_suspend_enabled && uart_console(uport)) | |
2097 | goto unlock; | |
2098 | ||
2099 | uport->suspended = 1; | |
b3b708fa | 2100 | |
d41861ca | 2101 | if (tty_port_initialized(port)) { |
ccce6deb | 2102 | const struct uart_ops *ops = uport->ops; |
c8c6bfa3 | 2103 | int tries; |
1da177e4 | 2104 | |
80f02d54 | 2105 | tty_port_set_suspended(port, 1); |
d41861ca | 2106 | tty_port_set_initialized(port, 0); |
a6b93a90 | 2107 | |
b164c972 PH |
2108 | spin_lock_irq(&uport->lock); |
2109 | ops->stop_tx(uport); | |
2110 | ops->set_mctrl(uport, 0); | |
2111 | ops->stop_rx(uport); | |
2112 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
2113 | |
2114 | /* | |
2115 | * Wait for the transmitter to empty. | |
2116 | */ | |
ccce6deb | 2117 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
1da177e4 | 2118 | msleep(10); |
c8c6bfa3 | 2119 | if (!tries) |
cade3580 AS |
2120 | dev_err(uport->dev, "%s: Unable to drain transmitter\n", |
2121 | uport->name); | |
1da177e4 | 2122 | |
b164c972 | 2123 | ops->shutdown(uport); |
1da177e4 LT |
2124 | } |
2125 | ||
2126 | /* | |
2127 | * Disable the console device before suspending. | |
2128 | */ | |
b164c972 | 2129 | if (uart_console(uport)) |
ccce6deb | 2130 | console_stop(uport->cons); |
1da177e4 | 2131 | |
b164c972 PH |
2132 | uart_change_pm(state, UART_PM_STATE_OFF); |
2133 | unlock: | |
a2bceae0 | 2134 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2135 | |
2136 | return 0; | |
2137 | } | |
2138 | ||
ccce6deb | 2139 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2140 | { |
ccce6deb AC |
2141 | struct uart_state *state = drv->state + uport->line; |
2142 | struct tty_port *port = &state->port; | |
03a74dcc | 2143 | struct device *tty_dev; |
ccce6deb | 2144 | struct uart_match match = {uport, drv}; |
ba15ab0e | 2145 | struct ktermios termios; |
1da177e4 | 2146 | |
a2bceae0 | 2147 | mutex_lock(&port->mutex); |
1da177e4 | 2148 | |
ccce6deb AC |
2149 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
2150 | if (!uport->suspended && device_may_wakeup(tty_dev)) { | |
3f960dbb G |
2151 | if (uport->irq_wake) { |
2152 | disable_irq_wake(uport->irq); | |
2153 | uport->irq_wake = 0; | |
2154 | } | |
5a65dcc0 | 2155 | put_device(tty_dev); |
a2bceae0 | 2156 | mutex_unlock(&port->mutex); |
b3b708fa GL |
2157 | return 0; |
2158 | } | |
5a65dcc0 | 2159 | put_device(tty_dev); |
ccce6deb | 2160 | uport->suspended = 0; |
b3b708fa | 2161 | |
1da177e4 LT |
2162 | /* |
2163 | * Re-enable the console device after suspending. | |
2164 | */ | |
5933a161 | 2165 | if (uart_console(uport)) { |
891b9dd1 JW |
2166 | /* |
2167 | * First try to use the console cflag setting. | |
2168 | */ | |
2169 | memset(&termios, 0, sizeof(struct ktermios)); | |
2170 | termios.c_cflag = uport->cons->cflag; | |
2171 | ||
2172 | /* | |
2173 | * If that's unset, use the tty termios setting. | |
2174 | */ | |
adc8d746 AC |
2175 | if (port->tty && termios.c_cflag == 0) |
2176 | termios = port->tty->termios; | |
891b9dd1 | 2177 | |
94abc56f | 2178 | if (console_suspend_enabled) |
6f538fe3 | 2179 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb | 2180 | uport->ops->set_termios(uport, &termios, NULL); |
5933a161 YK |
2181 | if (console_suspend_enabled) |
2182 | console_start(uport->cons); | |
1da177e4 LT |
2183 | } |
2184 | ||
80f02d54 | 2185 | if (tty_port_suspended(port)) { |
ccce6deb | 2186 | const struct uart_ops *ops = uport->ops; |
ee31b337 | 2187 | int ret; |
1da177e4 | 2188 | |
6f538fe3 | 2189 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb AC |
2190 | spin_lock_irq(&uport->lock); |
2191 | ops->set_mctrl(uport, 0); | |
2192 | spin_unlock_irq(&uport->lock); | |
4547be78 | 2193 | if (console_suspend_enabled || !uart_console(uport)) { |
19225135 AC |
2194 | /* Protected by port mutex for now */ |
2195 | struct tty_struct *tty = port->tty; | |
4547be78 SB |
2196 | ret = ops->startup(uport); |
2197 | if (ret == 0) { | |
19225135 AC |
2198 | if (tty) |
2199 | uart_change_speed(tty, state, NULL); | |
4547be78 SB |
2200 | spin_lock_irq(&uport->lock); |
2201 | ops->set_mctrl(uport, uport->mctrl); | |
2202 | ops->start_tx(uport); | |
2203 | spin_unlock_irq(&uport->lock); | |
d41861ca | 2204 | tty_port_set_initialized(port, 1); |
4547be78 SB |
2205 | } else { |
2206 | /* | |
2207 | * Failed to resume - maybe hardware went away? | |
2208 | * Clear the "initialized" flag so we won't try | |
2209 | * to call the low level drivers shutdown method. | |
2210 | */ | |
19225135 | 2211 | uart_shutdown(tty, state); |
4547be78 | 2212 | } |
ee31b337 | 2213 | } |
a6b93a90 | 2214 | |
80f02d54 | 2215 | tty_port_set_suspended(port, 0); |
1da177e4 LT |
2216 | } |
2217 | ||
a2bceae0 | 2218 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2219 | |
2220 | return 0; | |
2221 | } | |
2222 | ||
2223 | static inline void | |
2224 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2225 | { | |
30b7a3bc RK |
2226 | char address[64]; |
2227 | ||
1da177e4 LT |
2228 | switch (port->iotype) { |
2229 | case UPIO_PORT: | |
9bde10a4 | 2230 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2231 | break; |
2232 | case UPIO_HUB6: | |
30b7a3bc | 2233 | snprintf(address, sizeof(address), |
9bde10a4 | 2234 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2235 | break; |
2236 | case UPIO_MEM: | |
bd94c407 | 2237 | case UPIO_MEM16: |
1da177e4 | 2238 | case UPIO_MEM32: |
3ffb1a81 | 2239 | case UPIO_MEM32BE: |
21c614a7 | 2240 | case UPIO_AU: |
3be91ec7 | 2241 | case UPIO_TSI: |
30b7a3bc | 2242 | snprintf(address, sizeof(address), |
4f640efb | 2243 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2244 | break; |
2245 | default: | |
2246 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2247 | break; |
2248 | } | |
30b7a3bc | 2249 | |
cade3580 | 2250 | pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", |
68ed7e1c JB |
2251 | port->dev ? dev_name(port->dev) : "", |
2252 | port->dev ? ": " : "", | |
cade3580 | 2253 | port->name, |
7d12b976 | 2254 | address, port->irq, port->uartclk / 16, uart_type(port)); |
1da177e4 LT |
2255 | } |
2256 | ||
2257 | static void | |
2258 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2259 | struct uart_port *port) | |
2260 | { | |
2261 | unsigned int flags; | |
2262 | ||
2263 | /* | |
2264 | * If there isn't a port here, don't do anything further. | |
2265 | */ | |
2266 | if (!port->iobase && !port->mapbase && !port->membase) | |
2267 | return; | |
2268 | ||
2269 | /* | |
2270 | * Now do the auto configuration stuff. Note that config_port | |
2271 | * is expected to claim the resources and map the port for us. | |
2272 | */ | |
8e23fcc8 | 2273 | flags = 0; |
1da177e4 LT |
2274 | if (port->flags & UPF_AUTO_IRQ) |
2275 | flags |= UART_CONFIG_IRQ; | |
2276 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2277 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2278 | port->type = PORT_UNKNOWN; | |
2279 | flags |= UART_CONFIG_TYPE; | |
2280 | } | |
1da177e4 LT |
2281 | port->ops->config_port(port, flags); |
2282 | } | |
2283 | ||
2284 | if (port->type != PORT_UNKNOWN) { | |
2285 | unsigned long flags; | |
2286 | ||
2287 | uart_report_port(drv, port); | |
2288 | ||
3689a0ec | 2289 | /* Power up port for set_mctrl() */ |
6f538fe3 | 2290 | uart_change_pm(state, UART_PM_STATE_ON); |
3689a0ec | 2291 | |
1da177e4 LT |
2292 | /* |
2293 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2294 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2295 | * We probably don't need a spinlock around this, but |
2296 | */ | |
2297 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2298 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2299 | spin_unlock_irqrestore(&port->lock, flags); |
2300 | ||
97d97224 RK |
2301 | /* |
2302 | * If this driver supports console, and it hasn't been | |
2303 | * successfully registered yet, try to re-register it. | |
2304 | * It may be that the port was not available. | |
2305 | */ | |
2306 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2307 | register_console(port->cons); | |
2308 | ||
1da177e4 LT |
2309 | /* |
2310 | * Power down all ports by default, except the | |
2311 | * console if we have one. | |
2312 | */ | |
2313 | if (!uart_console(port)) | |
6f538fe3 | 2314 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 LT |
2315 | } |
2316 | } | |
2317 | ||
f2d937f3 JW |
2318 | #ifdef CONFIG_CONSOLE_POLL |
2319 | ||
2320 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2321 | { | |
2322 | struct uart_driver *drv = driver->driver_state; | |
2323 | struct uart_state *state = drv->state + line; | |
49c02304 | 2324 | struct tty_port *tport; |
f2d937f3 JW |
2325 | struct uart_port *port; |
2326 | int baud = 9600; | |
2327 | int bits = 8; | |
2328 | int parity = 'n'; | |
2329 | int flow = 'n'; | |
49c02304 | 2330 | int ret = 0; |
f2d937f3 | 2331 | |
49c02304 PH |
2332 | tport = &state->port; |
2333 | mutex_lock(&tport->mutex); | |
2334 | ||
4047b371 PH |
2335 | port = uart_port_check(state); |
2336 | if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { | |
49c02304 PH |
2337 | ret = -1; |
2338 | goto out; | |
2339 | } | |
f2d937f3 | 2340 | |
c7f3e708 | 2341 | if (port->ops->poll_init) { |
c7f3e708 | 2342 | /* |
d41861ca PH |
2343 | * We don't set initialized as we only initialized the hw, |
2344 | * e.g. state->xmit is still uninitialized. | |
c7f3e708 | 2345 | */ |
d41861ca | 2346 | if (!tty_port_initialized(tport)) |
c7f3e708 | 2347 | ret = port->ops->poll_init(port); |
c7f3e708 AV |
2348 | } |
2349 | ||
49c02304 | 2350 | if (!ret && options) { |
f2d937f3 | 2351 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
49c02304 | 2352 | ret = uart_set_options(port, NULL, baud, parity, bits, flow); |
f2d937f3 | 2353 | } |
49c02304 PH |
2354 | out: |
2355 | mutex_unlock(&tport->mutex); | |
2356 | return ret; | |
f2d937f3 JW |
2357 | } |
2358 | ||
2359 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2360 | { | |
2361 | struct uart_driver *drv = driver->driver_state; | |
2362 | struct uart_state *state = drv->state + line; | |
2363 | struct uart_port *port; | |
9ed19428 | 2364 | int ret = -1; |
f2d937f3 | 2365 | |
22077b09 JS |
2366 | port = uart_port_ref(state); |
2367 | if (port) { | |
2368 | ret = port->ops->poll_get_char(port); | |
2369 | uart_port_deref(port); | |
9ed19428 | 2370 | } |
22077b09 | 2371 | |
9ed19428 | 2372 | return ret; |
f2d937f3 JW |
2373 | } |
2374 | ||
2375 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2376 | { | |
2377 | struct uart_driver *drv = driver->driver_state; | |
2378 | struct uart_state *state = drv->state + line; | |
2379 | struct uart_port *port; | |
2380 | ||
9ed19428 PH |
2381 | port = uart_port_ref(state); |
2382 | if (!port) | |
2383 | return; | |
c7d44a02 DA |
2384 | |
2385 | if (ch == '\n') | |
2386 | port->ops->poll_put_char(port, '\r'); | |
f2d937f3 | 2387 | port->ops->poll_put_char(port, ch); |
9ed19428 | 2388 | uart_port_deref(port); |
f2d937f3 JW |
2389 | } |
2390 | #endif | |
2391 | ||
b68e31d0 | 2392 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2393 | .open = uart_open, |
2394 | .close = uart_close, | |
2395 | .write = uart_write, | |
2396 | .put_char = uart_put_char, | |
2397 | .flush_chars = uart_flush_chars, | |
2398 | .write_room = uart_write_room, | |
2399 | .chars_in_buffer= uart_chars_in_buffer, | |
2400 | .flush_buffer = uart_flush_buffer, | |
2401 | .ioctl = uart_ioctl, | |
2402 | .throttle = uart_throttle, | |
2403 | .unthrottle = uart_unthrottle, | |
2404 | .send_xchar = uart_send_xchar, | |
2405 | .set_termios = uart_set_termios, | |
64e9159f | 2406 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2407 | .stop = uart_stop, |
2408 | .start = uart_start, | |
2409 | .hangup = uart_hangup, | |
2410 | .break_ctl = uart_break_ctl, | |
2411 | .wait_until_sent= uart_wait_until_sent, | |
2412 | #ifdef CONFIG_PROC_FS | |
d196a949 | 2413 | .proc_fops = &uart_proc_fops, |
1da177e4 LT |
2414 | #endif |
2415 | .tiocmget = uart_tiocmget, | |
2416 | .tiocmset = uart_tiocmset, | |
d281da7f | 2417 | .get_icount = uart_get_icount, |
f2d937f3 JW |
2418 | #ifdef CONFIG_CONSOLE_POLL |
2419 | .poll_init = uart_poll_init, | |
2420 | .poll_get_char = uart_poll_get_char, | |
2421 | .poll_put_char = uart_poll_put_char, | |
2422 | #endif | |
1da177e4 LT |
2423 | }; |
2424 | ||
de0c8cb3 AC |
2425 | static const struct tty_port_operations uart_port_ops = { |
2426 | .carrier_raised = uart_carrier_raised, | |
2427 | .dtr_rts = uart_dtr_rts, | |
b3b57646 | 2428 | .activate = uart_port_activate, |
761ed4a9 | 2429 | .shutdown = uart_tty_port_shutdown, |
de0c8cb3 AC |
2430 | }; |
2431 | ||
1da177e4 LT |
2432 | /** |
2433 | * uart_register_driver - register a driver with the uart core layer | |
2434 | * @drv: low level driver structure | |
2435 | * | |
2436 | * Register a uart driver with the core driver. We in turn register | |
2437 | * with the tty layer, and initialise the core driver per-port state. | |
2438 | * | |
2439 | * We have a proc file in /proc/tty/driver which is named after the | |
2440 | * normal driver. | |
2441 | * | |
2442 | * drv->port should be NULL, and the per-port structures should be | |
2443 | * registered using uart_add_one_port after this call has succeeded. | |
2444 | */ | |
2445 | int uart_register_driver(struct uart_driver *drv) | |
2446 | { | |
9e845abf | 2447 | struct tty_driver *normal; |
1da177e4 LT |
2448 | int i, retval; |
2449 | ||
2450 | BUG_ON(drv->state); | |
2451 | ||
2452 | /* | |
2453 | * Maybe we should be using a slab cache for this, especially if | |
2454 | * we have a large number of ports to handle. | |
2455 | */ | |
8f31bb39 | 2456 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2457 | if (!drv->state) |
2458 | goto out; | |
2459 | ||
9e845abf | 2460 | normal = alloc_tty_driver(drv->nr); |
1da177e4 | 2461 | if (!normal) |
9e845abf | 2462 | goto out_kfree; |
1da177e4 LT |
2463 | |
2464 | drv->tty_driver = normal; | |
2465 | ||
1da177e4 | 2466 | normal->driver_name = drv->driver_name; |
1da177e4 LT |
2467 | normal->name = drv->dev_name; |
2468 | normal->major = drv->major; | |
2469 | normal->minor_start = drv->minor; | |
2470 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2471 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2472 | normal->init_termios = tty_std_termios; | |
2473 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2474 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2475 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2476 | normal->driver_state = drv; |
2477 | tty_set_operations(normal, &uart_ops); | |
2478 | ||
2479 | /* | |
2480 | * Initialise the UART state(s). | |
2481 | */ | |
2482 | for (i = 0; i < drv->nr; i++) { | |
2483 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 2484 | struct tty_port *port = &state->port; |
1da177e4 | 2485 | |
a2bceae0 | 2486 | tty_port_init(port); |
de0c8cb3 | 2487 | port->ops = &uart_port_ops; |
1da177e4 LT |
2488 | } |
2489 | ||
2490 | retval = tty_register_driver(normal); | |
9e845abf AGR |
2491 | if (retval >= 0) |
2492 | return retval; | |
2493 | ||
191c5f10 JS |
2494 | for (i = 0; i < drv->nr; i++) |
2495 | tty_port_destroy(&drv->state[i].port); | |
9e845abf AGR |
2496 | put_tty_driver(normal); |
2497 | out_kfree: | |
2498 | kfree(drv->state); | |
2499 | out: | |
2500 | return -ENOMEM; | |
1da177e4 LT |
2501 | } |
2502 | ||
2503 | /** | |
2504 | * uart_unregister_driver - remove a driver from the uart core layer | |
2505 | * @drv: low level driver structure | |
2506 | * | |
2507 | * Remove all references to a driver from the core driver. The low | |
2508 | * level driver must have removed all its ports via the | |
2509 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2510 | * (ie, drv->port == NULL) | |
2511 | */ | |
2512 | void uart_unregister_driver(struct uart_driver *drv) | |
2513 | { | |
2514 | struct tty_driver *p = drv->tty_driver; | |
191c5f10 JS |
2515 | unsigned int i; |
2516 | ||
1da177e4 LT |
2517 | tty_unregister_driver(p); |
2518 | put_tty_driver(p); | |
191c5f10 JS |
2519 | for (i = 0; i < drv->nr; i++) |
2520 | tty_port_destroy(&drv->state[i].port); | |
1da177e4 | 2521 | kfree(drv->state); |
1e66cded | 2522 | drv->state = NULL; |
1da177e4 LT |
2523 | drv->tty_driver = NULL; |
2524 | } | |
2525 | ||
2526 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2527 | { | |
2528 | struct uart_driver *p = co->data; | |
2529 | *index = co->index; | |
2530 | return p->tty_driver; | |
2531 | } | |
2532 | ||
6915c0e4 TH |
2533 | static ssize_t uart_get_attr_uartclk(struct device *dev, |
2534 | struct device_attribute *attr, char *buf) | |
2535 | { | |
bebe73e3 | 2536 | struct serial_struct tmp; |
6915c0e4 | 2537 | struct tty_port *port = dev_get_drvdata(dev); |
6915c0e4 | 2538 | |
9f109694 | 2539 | uart_get_info(port, &tmp); |
bebe73e3 | 2540 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); |
6915c0e4 TH |
2541 | } |
2542 | ||
373bac4c AC |
2543 | static ssize_t uart_get_attr_type(struct device *dev, |
2544 | struct device_attribute *attr, char *buf) | |
2545 | { | |
2546 | struct serial_struct tmp; | |
2547 | struct tty_port *port = dev_get_drvdata(dev); | |
2548 | ||
2549 | uart_get_info(port, &tmp); | |
2550 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); | |
2551 | } | |
2552 | static ssize_t uart_get_attr_line(struct device *dev, | |
2553 | struct device_attribute *attr, char *buf) | |
2554 | { | |
2555 | struct serial_struct tmp; | |
2556 | struct tty_port *port = dev_get_drvdata(dev); | |
2557 | ||
2558 | uart_get_info(port, &tmp); | |
2559 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); | |
2560 | } | |
2561 | ||
2562 | static ssize_t uart_get_attr_port(struct device *dev, | |
2563 | struct device_attribute *attr, char *buf) | |
2564 | { | |
2565 | struct serial_struct tmp; | |
2566 | struct tty_port *port = dev_get_drvdata(dev); | |
fd985e1d | 2567 | unsigned long ioaddr; |
373bac4c AC |
2568 | |
2569 | uart_get_info(port, &tmp); | |
fd985e1d AM |
2570 | ioaddr = tmp.port; |
2571 | if (HIGH_BITS_OFFSET) | |
2572 | ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; | |
2573 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); | |
373bac4c AC |
2574 | } |
2575 | ||
2576 | static ssize_t uart_get_attr_irq(struct device *dev, | |
2577 | struct device_attribute *attr, char *buf) | |
2578 | { | |
2579 | struct serial_struct tmp; | |
2580 | struct tty_port *port = dev_get_drvdata(dev); | |
2581 | ||
2582 | uart_get_info(port, &tmp); | |
2583 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); | |
2584 | } | |
2585 | ||
2586 | static ssize_t uart_get_attr_flags(struct device *dev, | |
2587 | struct device_attribute *attr, char *buf) | |
2588 | { | |
2589 | struct serial_struct tmp; | |
2590 | struct tty_port *port = dev_get_drvdata(dev); | |
2591 | ||
2592 | uart_get_info(port, &tmp); | |
2593 | return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); | |
2594 | } | |
2595 | ||
2596 | static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, | |
2597 | struct device_attribute *attr, char *buf) | |
2598 | { | |
2599 | struct serial_struct tmp; | |
2600 | struct tty_port *port = dev_get_drvdata(dev); | |
2601 | ||
2602 | uart_get_info(port, &tmp); | |
2603 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); | |
2604 | } | |
2605 | ||
2606 | ||
2607 | static ssize_t uart_get_attr_close_delay(struct device *dev, | |
2608 | struct device_attribute *attr, char *buf) | |
2609 | { | |
2610 | struct serial_struct tmp; | |
2611 | struct tty_port *port = dev_get_drvdata(dev); | |
2612 | ||
2613 | uart_get_info(port, &tmp); | |
2614 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); | |
2615 | } | |
2616 | ||
2617 | ||
2618 | static ssize_t uart_get_attr_closing_wait(struct device *dev, | |
2619 | struct device_attribute *attr, char *buf) | |
2620 | { | |
2621 | struct serial_struct tmp; | |
2622 | struct tty_port *port = dev_get_drvdata(dev); | |
2623 | ||
2624 | uart_get_info(port, &tmp); | |
2625 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); | |
2626 | } | |
2627 | ||
2628 | static ssize_t uart_get_attr_custom_divisor(struct device *dev, | |
2629 | struct device_attribute *attr, char *buf) | |
2630 | { | |
2631 | struct serial_struct tmp; | |
2632 | struct tty_port *port = dev_get_drvdata(dev); | |
2633 | ||
2634 | uart_get_info(port, &tmp); | |
2635 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); | |
2636 | } | |
2637 | ||
2638 | static ssize_t uart_get_attr_io_type(struct device *dev, | |
2639 | struct device_attribute *attr, char *buf) | |
2640 | { | |
2641 | struct serial_struct tmp; | |
2642 | struct tty_port *port = dev_get_drvdata(dev); | |
2643 | ||
2644 | uart_get_info(port, &tmp); | |
2645 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); | |
2646 | } | |
2647 | ||
2648 | static ssize_t uart_get_attr_iomem_base(struct device *dev, | |
2649 | struct device_attribute *attr, char *buf) | |
2650 | { | |
2651 | struct serial_struct tmp; | |
2652 | struct tty_port *port = dev_get_drvdata(dev); | |
2653 | ||
2654 | uart_get_info(port, &tmp); | |
2655 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); | |
2656 | } | |
2657 | ||
2658 | static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, | |
2659 | struct device_attribute *attr, char *buf) | |
2660 | { | |
2661 | struct serial_struct tmp; | |
2662 | struct tty_port *port = dev_get_drvdata(dev); | |
2663 | ||
2664 | uart_get_info(port, &tmp); | |
2665 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); | |
2666 | } | |
2667 | ||
2668 | static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); | |
2669 | static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); | |
2670 | static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); | |
2671 | static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); | |
2672 | static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); | |
2673 | static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); | |
6915c0e4 | 2674 | static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); |
373bac4c AC |
2675 | static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); |
2676 | static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); | |
2677 | static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); | |
2678 | static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); | |
2679 | static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); | |
2680 | static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); | |
6915c0e4 TH |
2681 | |
2682 | static struct attribute *tty_dev_attrs[] = { | |
373bac4c AC |
2683 | &dev_attr_type.attr, |
2684 | &dev_attr_line.attr, | |
2685 | &dev_attr_port.attr, | |
2686 | &dev_attr_irq.attr, | |
2687 | &dev_attr_flags.attr, | |
2688 | &dev_attr_xmit_fifo_size.attr, | |
6915c0e4 | 2689 | &dev_attr_uartclk.attr, |
373bac4c AC |
2690 | &dev_attr_close_delay.attr, |
2691 | &dev_attr_closing_wait.attr, | |
2692 | &dev_attr_custom_divisor.attr, | |
2693 | &dev_attr_io_type.attr, | |
2694 | &dev_attr_iomem_base.attr, | |
2695 | &dev_attr_iomem_reg_shift.attr, | |
6915c0e4 TH |
2696 | NULL, |
2697 | }; | |
2698 | ||
b1b79916 | 2699 | static const struct attribute_group tty_dev_attr_group = { |
6915c0e4 TH |
2700 | .attrs = tty_dev_attrs, |
2701 | }; | |
2702 | ||
1da177e4 LT |
2703 | /** |
2704 | * uart_add_one_port - attach a driver-defined port structure | |
2705 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2706 | * @uport: uart port structure to use for this port. |
1da177e4 LT |
2707 | * |
2708 | * This allows the driver to register its own uart_port structure | |
2709 | * with the core driver. The main purpose is to allow the low | |
2710 | * level uart drivers to expand uart_port, rather than having yet | |
2711 | * more levels of structures. | |
2712 | */ | |
a2bceae0 | 2713 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 LT |
2714 | { |
2715 | struct uart_state *state; | |
a2bceae0 | 2716 | struct tty_port *port; |
1da177e4 | 2717 | int ret = 0; |
b3b708fa | 2718 | struct device *tty_dev; |
266dcff0 | 2719 | int num_groups; |
1da177e4 LT |
2720 | |
2721 | BUG_ON(in_interrupt()); | |
2722 | ||
a2bceae0 | 2723 | if (uport->line >= drv->nr) |
1da177e4 LT |
2724 | return -EINVAL; |
2725 | ||
a2bceae0 AC |
2726 | state = drv->state + uport->line; |
2727 | port = &state->port; | |
1da177e4 | 2728 | |
f392ecfa | 2729 | mutex_lock(&port_mutex); |
a2bceae0 | 2730 | mutex_lock(&port->mutex); |
ebd2c8f6 | 2731 | if (state->uart_port) { |
1da177e4 LT |
2732 | ret = -EINVAL; |
2733 | goto out; | |
2734 | } | |
2735 | ||
2b702b9b | 2736 | /* Link the port to the driver state table and vice versa */ |
9ed19428 PH |
2737 | atomic_set(&state->refcount, 1); |
2738 | init_waitqueue_head(&state->remove_wait); | |
a2bceae0 | 2739 | state->uart_port = uport; |
2b702b9b | 2740 | uport->state = state; |
1da177e4 | 2741 | |
2b702b9b | 2742 | state->pm_state = UART_PM_STATE_UNDEFINED; |
a2bceae0 | 2743 | uport->cons = drv->cons; |
959801fe | 2744 | uport->minor = drv->tty_driver->minor_start + uport->line; |
f7048b15 V |
2745 | uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, |
2746 | drv->tty_driver->name_base + uport->line); | |
2747 | if (!uport->name) { | |
2748 | ret = -ENOMEM; | |
2749 | goto out; | |
2750 | } | |
1da177e4 | 2751 | |
976ecd12 RK |
2752 | /* |
2753 | * If this port is a console, then the spinlock is already | |
2754 | * initialised. | |
2755 | */ | |
a2bceae0 AC |
2756 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
2757 | spin_lock_init(&uport->lock); | |
2758 | lockdep_set_class(&uport->lock, &port_lock_key); | |
13e83599 | 2759 | } |
a208ffd2 GL |
2760 | if (uport->cons && uport->dev) |
2761 | of_console_check(uport->dev->of_node, uport->cons->name, uport->line); | |
976ecd12 | 2762 | |
a2bceae0 | 2763 | uart_configure_port(drv, state, uport); |
1da177e4 | 2764 | |
4dda864d GU |
2765 | port->console = uart_console(uport); |
2766 | ||
266dcff0 GKH |
2767 | num_groups = 2; |
2768 | if (uport->attr_group) | |
2769 | num_groups++; | |
2770 | ||
c2b703b8 | 2771 | uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), |
266dcff0 GKH |
2772 | GFP_KERNEL); |
2773 | if (!uport->tty_groups) { | |
2774 | ret = -ENOMEM; | |
2775 | goto out; | |
2776 | } | |
2777 | uport->tty_groups[0] = &tty_dev_attr_group; | |
2778 | if (uport->attr_group) | |
2779 | uport->tty_groups[1] = uport->attr_group; | |
2780 | ||
1da177e4 LT |
2781 | /* |
2782 | * Register the port whether it's detected or not. This allows | |
015355b7 | 2783 | * setserial to be used to alter this port's parameters. |
1da177e4 | 2784 | */ |
da4c2799 | 2785 | tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, |
266dcff0 | 2786 | uport->line, uport->dev, port, uport->tty_groups); |
b3b708fa | 2787 | if (likely(!IS_ERR(tty_dev))) { |
77359835 SG |
2788 | device_set_wakeup_capable(tty_dev, 1); |
2789 | } else { | |
2f2dafe7 | 2790 | dev_err(uport->dev, "Cannot register tty device on line %d\n", |
a2bceae0 | 2791 | uport->line); |
77359835 | 2792 | } |
1da177e4 | 2793 | |
68ac64cd RK |
2794 | /* |
2795 | * Ensure UPF_DEAD is not set. | |
2796 | */ | |
a2bceae0 | 2797 | uport->flags &= ~UPF_DEAD; |
68ac64cd | 2798 | |
1da177e4 | 2799 | out: |
a2bceae0 | 2800 | mutex_unlock(&port->mutex); |
f392ecfa | 2801 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2802 | |
2803 | return ret; | |
2804 | } | |
2805 | ||
2806 | /** | |
2807 | * uart_remove_one_port - detach a driver defined port structure | |
2808 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2809 | * @uport: uart port structure for this port |
1da177e4 LT |
2810 | * |
2811 | * This unhooks (and hangs up) the specified port structure from the | |
2812 | * core driver. No further calls will be made to the low-level code | |
2813 | * for this port. | |
2814 | */ | |
a2bceae0 | 2815 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2816 | { |
a2bceae0 AC |
2817 | struct uart_state *state = drv->state + uport->line; |
2818 | struct tty_port *port = &state->port; | |
4047b371 | 2819 | struct uart_port *uart_port; |
4c6d5b4d | 2820 | struct tty_struct *tty; |
b342dd51 | 2821 | int ret = 0; |
1da177e4 LT |
2822 | |
2823 | BUG_ON(in_interrupt()); | |
2824 | ||
f392ecfa | 2825 | mutex_lock(&port_mutex); |
1da177e4 | 2826 | |
68ac64cd RK |
2827 | /* |
2828 | * Mark the port "dead" - this prevents any opens from | |
2829 | * succeeding while we shut down the port. | |
2830 | */ | |
a2bceae0 | 2831 | mutex_lock(&port->mutex); |
4047b371 PH |
2832 | uart_port = uart_port_check(state); |
2833 | if (uart_port != uport) | |
2834 | dev_alert(uport->dev, "Removing wrong port: %p != %p\n", | |
2835 | uart_port, uport); | |
2836 | ||
2837 | if (!uart_port) { | |
b342dd51 CG |
2838 | mutex_unlock(&port->mutex); |
2839 | ret = -EINVAL; | |
2840 | goto out; | |
2841 | } | |
a2bceae0 AC |
2842 | uport->flags |= UPF_DEAD; |
2843 | mutex_unlock(&port->mutex); | |
68ac64cd | 2844 | |
1da177e4 | 2845 | /* |
aa4148cf | 2846 | * Remove the devices from the tty layer |
1da177e4 | 2847 | */ |
da4c2799 | 2848 | tty_port_unregister_device(port, drv->tty_driver, uport->line); |
1da177e4 | 2849 | |
4c6d5b4d GU |
2850 | tty = tty_port_tty_get(port); |
2851 | if (tty) { | |
a2bceae0 | 2852 | tty_vhangup(port->tty); |
4c6d5b4d GU |
2853 | tty_kref_put(tty); |
2854 | } | |
68ac64cd | 2855 | |
5f5c9ae5 GU |
2856 | /* |
2857 | * If the port is used as a console, unregister it | |
2858 | */ | |
2859 | if (uart_console(uport)) | |
2860 | unregister_console(uport->cons); | |
2861 | ||
68ac64cd RK |
2862 | /* |
2863 | * Free the port IO and memory resources, if any. | |
2864 | */ | |
a7cfaf16 | 2865 | if (uport->type != PORT_UNKNOWN && uport->ops->release_port) |
a2bceae0 | 2866 | uport->ops->release_port(uport); |
266dcff0 | 2867 | kfree(uport->tty_groups); |
f7048b15 | 2868 | kfree(uport->name); |
68ac64cd RK |
2869 | |
2870 | /* | |
2871 | * Indicate that there isn't a port here anymore. | |
2872 | */ | |
a2bceae0 | 2873 | uport->type = PORT_UNKNOWN; |
68ac64cd | 2874 | |
4047b371 | 2875 | mutex_lock(&port->mutex); |
9ed19428 PH |
2876 | WARN_ON(atomic_dec_return(&state->refcount) < 0); |
2877 | wait_event(state->remove_wait, !atomic_read(&state->refcount)); | |
ebd2c8f6 | 2878 | state->uart_port = NULL; |
4047b371 | 2879 | mutex_unlock(&port->mutex); |
b342dd51 | 2880 | out: |
f392ecfa | 2881 | mutex_unlock(&port_mutex); |
1da177e4 | 2882 | |
b342dd51 | 2883 | return ret; |
1da177e4 LT |
2884 | } |
2885 | ||
2886 | /* | |
2887 | * Are the two ports equivalent? | |
2888 | */ | |
2889 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2890 | { | |
2891 | if (port1->iotype != port2->iotype) | |
2892 | return 0; | |
2893 | ||
2894 | switch (port1->iotype) { | |
2895 | case UPIO_PORT: | |
2896 | return (port1->iobase == port2->iobase); | |
2897 | case UPIO_HUB6: | |
2898 | return (port1->iobase == port2->iobase) && | |
2899 | (port1->hub6 == port2->hub6); | |
2900 | case UPIO_MEM: | |
bd94c407 | 2901 | case UPIO_MEM16: |
d21b55d3 | 2902 | case UPIO_MEM32: |
3ffb1a81 | 2903 | case UPIO_MEM32BE: |
d21b55d3 SS |
2904 | case UPIO_AU: |
2905 | case UPIO_TSI: | |
1624f003 | 2906 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2907 | } |
2908 | return 0; | |
2909 | } | |
2910 | EXPORT_SYMBOL(uart_match_port); | |
2911 | ||
027d7dac JS |
2912 | /** |
2913 | * uart_handle_dcd_change - handle a change of carrier detect state | |
2914 | * @uport: uart_port structure for the open port | |
2915 | * @status: new carrier detect status, nonzero if active | |
4d90bb14 PH |
2916 | * |
2917 | * Caller must hold uport->lock | |
027d7dac JS |
2918 | */ |
2919 | void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) | |
2920 | { | |
42381572 | 2921 | struct tty_port *port = &uport->state->port; |
43eca0ae | 2922 | struct tty_struct *tty = port->tty; |
c993257b | 2923 | struct tty_ldisc *ld; |
027d7dac | 2924 | |
4d90bb14 PH |
2925 | lockdep_assert_held_once(&uport->lock); |
2926 | ||
c993257b PH |
2927 | if (tty) { |
2928 | ld = tty_ldisc_ref(tty); | |
2929 | if (ld) { | |
2930 | if (ld->ops->dcd_change) | |
2931 | ld->ops->dcd_change(tty, status); | |
2932 | tty_ldisc_deref(ld); | |
2933 | } | |
42381572 | 2934 | } |
027d7dac JS |
2935 | |
2936 | uport->icount.dcd++; | |
027d7dac | 2937 | |
299245a1 | 2938 | if (uart_dcd_enabled(uport)) { |
027d7dac JS |
2939 | if (status) |
2940 | wake_up_interruptible(&port->open_wait); | |
43eca0ae AC |
2941 | else if (tty) |
2942 | tty_hangup(tty); | |
027d7dac | 2943 | } |
027d7dac JS |
2944 | } |
2945 | EXPORT_SYMBOL_GPL(uart_handle_dcd_change); | |
2946 | ||
2947 | /** | |
2948 | * uart_handle_cts_change - handle a change of clear-to-send state | |
2949 | * @uport: uart_port structure for the open port | |
2950 | * @status: new clear to send status, nonzero if active | |
4d90bb14 PH |
2951 | * |
2952 | * Caller must hold uport->lock | |
027d7dac JS |
2953 | */ |
2954 | void uart_handle_cts_change(struct uart_port *uport, unsigned int status) | |
2955 | { | |
4d90bb14 PH |
2956 | lockdep_assert_held_once(&uport->lock); |
2957 | ||
027d7dac JS |
2958 | uport->icount.cts++; |
2959 | ||
391f93f2 | 2960 | if (uart_softcts_mode(uport)) { |
d01f4d18 | 2961 | if (uport->hw_stopped) { |
027d7dac | 2962 | if (status) { |
d01f4d18 | 2963 | uport->hw_stopped = 0; |
027d7dac JS |
2964 | uport->ops->start_tx(uport); |
2965 | uart_write_wakeup(uport); | |
2966 | } | |
2967 | } else { | |
2968 | if (!status) { | |
d01f4d18 | 2969 | uport->hw_stopped = 1; |
027d7dac JS |
2970 | uport->ops->stop_tx(uport); |
2971 | } | |
2972 | } | |
391f93f2 | 2973 | |
027d7dac JS |
2974 | } |
2975 | } | |
2976 | EXPORT_SYMBOL_GPL(uart_handle_cts_change); | |
2977 | ||
cf75525f JS |
2978 | /** |
2979 | * uart_insert_char - push a char to the uart layer | |
2980 | * | |
2981 | * User is responsible to call tty_flip_buffer_push when they are done with | |
2982 | * insertion. | |
2983 | * | |
2984 | * @port: corresponding port | |
2985 | * @status: state of the serial port RX buffer (LSR for 8250) | |
2986 | * @overrun: mask of overrun bits in @status | |
2987 | * @ch: character to push | |
2988 | * @flag: flag for the character (see TTY_NORMAL and friends) | |
2989 | */ | |
027d7dac JS |
2990 | void uart_insert_char(struct uart_port *port, unsigned int status, |
2991 | unsigned int overrun, unsigned int ch, unsigned int flag) | |
2992 | { | |
92a19f9c | 2993 | struct tty_port *tport = &port->state->port; |
027d7dac JS |
2994 | |
2995 | if ((status & port->ignore_status_mask & ~overrun) == 0) | |
92a19f9c | 2996 | if (tty_insert_flip_char(tport, ch, flag) == 0) |
dabfb351 | 2997 | ++port->icount.buf_overrun; |
027d7dac JS |
2998 | |
2999 | /* | |
3000 | * Overrun is special. Since it's reported immediately, | |
3001 | * it doesn't affect the current character. | |
3002 | */ | |
3003 | if (status & ~port->ignore_status_mask & overrun) | |
92a19f9c | 3004 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) |
dabfb351 | 3005 | ++port->icount.buf_overrun; |
027d7dac JS |
3006 | } |
3007 | EXPORT_SYMBOL_GPL(uart_insert_char); | |
3008 | ||
1da177e4 LT |
3009 | EXPORT_SYMBOL(uart_write_wakeup); |
3010 | EXPORT_SYMBOL(uart_register_driver); | |
3011 | EXPORT_SYMBOL(uart_unregister_driver); | |
3012 | EXPORT_SYMBOL(uart_suspend_port); | |
3013 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
3014 | EXPORT_SYMBOL(uart_add_one_port); |
3015 | EXPORT_SYMBOL(uart_remove_one_port); | |
3016 | ||
3017 | MODULE_DESCRIPTION("Serial driver core"); | |
3018 | MODULE_LICENSE("GPL"); |