Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Driver core for serial ports |
3 | * | |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Copyright 1999 ARM Limited | |
7 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/tty.h> | |
027d7dac | 25 | #include <linux/tty_flip.h> |
1da177e4 LT |
26 | #include <linux/slab.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/console.h> | |
d196a949 AD |
29 | #include <linux/proc_fs.h> |
30 | #include <linux/seq_file.h> | |
1da177e4 LT |
31 | #include <linux/device.h> |
32 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ | |
ccce6deb | 33 | #include <linux/serial_core.h> |
1da177e4 | 34 | #include <linux/delay.h> |
f392ecfa | 35 | #include <linux/mutex.h> |
1da177e4 LT |
36 | |
37 | #include <asm/irq.h> | |
38 | #include <asm/uaccess.h> | |
39 | ||
1da177e4 LT |
40 | /* |
41 | * This is used to lock changes in serial line configuration. | |
42 | */ | |
f392ecfa | 43 | static DEFINE_MUTEX(port_mutex); |
1da177e4 | 44 | |
13e83599 IM |
45 | /* |
46 | * lockdep: port->lock is initialized in two places, but we | |
47 | * want only one lock-class: | |
48 | */ | |
49 | static struct lock_class_key port_lock_key; | |
50 | ||
1da177e4 LT |
51 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
52 | ||
19225135 | 53 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
a46c9994 | 54 | struct ktermios *old_termios); |
1f33a51d | 55 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
6f538fe3 LW |
56 | static void uart_change_pm(struct uart_state *state, |
57 | enum uart_pm_state pm_state); | |
1da177e4 | 58 | |
b922e19d JS |
59 | static void uart_port_shutdown(struct tty_port *port); |
60 | ||
1da177e4 LT |
61 | /* |
62 | * This routine is used by the interrupt handler to schedule processing in | |
63 | * the software interrupt portion of the driver. | |
64 | */ | |
65 | void uart_write_wakeup(struct uart_port *port) | |
66 | { | |
ebd2c8f6 | 67 | struct uart_state *state = port->state; |
d5f735e5 PM |
68 | /* |
69 | * This means you called this function _after_ the port was | |
70 | * closed. No cookie for you. | |
71 | */ | |
ebd2c8f6 | 72 | BUG_ON(!state); |
6a3e492b | 73 | tty_wakeup(state->port.tty); |
1da177e4 LT |
74 | } |
75 | ||
76 | static void uart_stop(struct tty_struct *tty) | |
77 | { | |
78 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 79 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
80 | unsigned long flags; |
81 | ||
82 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 83 | port->ops->stop_tx(port); |
1da177e4 LT |
84 | spin_unlock_irqrestore(&port->lock, flags); |
85 | } | |
86 | ||
87 | static void __uart_start(struct tty_struct *tty) | |
88 | { | |
89 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 90 | struct uart_port *port = state->uart_port; |
1da177e4 | 91 | |
717f3bba | 92 | if (!tty->stopped && !tty->hw_stopped) |
b129a8cc | 93 | port->ops->start_tx(port); |
1da177e4 LT |
94 | } |
95 | ||
96 | static void uart_start(struct tty_struct *tty) | |
97 | { | |
98 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 99 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
100 | unsigned long flags; |
101 | ||
102 | spin_lock_irqsave(&port->lock, flags); | |
103 | __uart_start(tty); | |
104 | spin_unlock_irqrestore(&port->lock, flags); | |
105 | } | |
106 | ||
1da177e4 LT |
107 | static inline void |
108 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) | |
109 | { | |
110 | unsigned long flags; | |
111 | unsigned int old; | |
112 | ||
113 | spin_lock_irqsave(&port->lock, flags); | |
114 | old = port->mctrl; | |
115 | port->mctrl = (old & ~clear) | set; | |
116 | if (old != port->mctrl) | |
117 | port->ops->set_mctrl(port, port->mctrl); | |
118 | spin_unlock_irqrestore(&port->lock, flags); | |
119 | } | |
120 | ||
a46c9994 AC |
121 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
122 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) | |
1da177e4 LT |
123 | |
124 | /* | |
125 | * Startup the port. This will be called once per open. All calls | |
df4f4dd4 | 126 | * will be serialised by the per-port mutex. |
1da177e4 | 127 | */ |
c0d92be6 JS |
128 | static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, |
129 | int init_hw) | |
1da177e4 | 130 | { |
46d57a44 AC |
131 | struct uart_port *uport = state->uart_port; |
132 | struct tty_port *port = &state->port; | |
1da177e4 LT |
133 | unsigned long page; |
134 | int retval = 0; | |
135 | ||
46d57a44 | 136 | if (uport->type == PORT_UNKNOWN) |
c0d92be6 | 137 | return 1; |
1da177e4 LT |
138 | |
139 | /* | |
140 | * Initialise and allocate the transmit and temporary | |
141 | * buffer. | |
142 | */ | |
ebd2c8f6 | 143 | if (!state->xmit.buf) { |
df4f4dd4 | 144 | /* This is protected by the per port mutex */ |
1da177e4 LT |
145 | page = get_zeroed_page(GFP_KERNEL); |
146 | if (!page) | |
147 | return -ENOMEM; | |
148 | ||
ebd2c8f6 AC |
149 | state->xmit.buf = (unsigned char *) page; |
150 | uart_circ_clear(&state->xmit); | |
1da177e4 LT |
151 | } |
152 | ||
46d57a44 | 153 | retval = uport->ops->startup(uport); |
1da177e4 | 154 | if (retval == 0) { |
c7d7abff | 155 | if (uart_console(uport) && uport->cons->cflag) { |
adc8d746 | 156 | tty->termios.c_cflag = uport->cons->cflag; |
c7d7abff JS |
157 | uport->cons->cflag = 0; |
158 | } | |
159 | /* | |
160 | * Initialise the hardware port settings. | |
161 | */ | |
162 | uart_change_speed(tty, state, NULL); | |
1da177e4 | 163 | |
c7d7abff | 164 | if (init_hw) { |
1da177e4 LT |
165 | /* |
166 | * Setup the RTS and DTR signals once the | |
167 | * port is open and ready to respond. | |
168 | */ | |
adc8d746 | 169 | if (tty->termios.c_cflag & CBAUD) |
46d57a44 | 170 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 LT |
171 | } |
172 | ||
f21ec3d2 | 173 | if (tty_port_cts_enabled(port)) { |
46d57a44 AC |
174 | spin_lock_irq(&uport->lock); |
175 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) | |
19225135 | 176 | tty->hw_stopped = 1; |
46d57a44 | 177 | spin_unlock_irq(&uport->lock); |
0dd7a1ae | 178 | } |
1da177e4 LT |
179 | } |
180 | ||
0055197e JS |
181 | /* |
182 | * This is to allow setserial on this port. People may want to set | |
183 | * port/irq/type and then reconfigure the port properly if it failed | |
184 | * now. | |
185 | */ | |
1da177e4 | 186 | if (retval && capable(CAP_SYS_ADMIN)) |
c0d92be6 JS |
187 | return 1; |
188 | ||
189 | return retval; | |
190 | } | |
191 | ||
192 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, | |
193 | int init_hw) | |
194 | { | |
195 | struct tty_port *port = &state->port; | |
196 | int retval; | |
197 | ||
198 | if (port->flags & ASYNC_INITIALIZED) | |
199 | return 0; | |
200 | ||
201 | /* | |
202 | * Set the TTY IO error marker - we will only clear this | |
203 | * once we have successfully opened the port. | |
204 | */ | |
205 | set_bit(TTY_IO_ERROR, &tty->flags); | |
206 | ||
207 | retval = uart_port_startup(tty, state, init_hw); | |
208 | if (!retval) { | |
209 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
210 | clear_bit(TTY_IO_ERROR, &tty->flags); | |
211 | } else if (retval > 0) | |
1da177e4 LT |
212 | retval = 0; |
213 | ||
214 | return retval; | |
215 | } | |
216 | ||
217 | /* | |
218 | * This routine will shutdown a serial port; interrupts are disabled, and | |
219 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
220 | * uart_shutdown are serialised by the per-port semaphore. | |
221 | */ | |
19225135 | 222 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
1da177e4 | 223 | { |
ccce6deb | 224 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 225 | struct tty_port *port = &state->port; |
1da177e4 | 226 | |
1da177e4 | 227 | /* |
ee31b337 | 228 | * Set the TTY IO error marker |
1da177e4 | 229 | */ |
f751928e AC |
230 | if (tty) |
231 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 232 | |
bdc04e31 | 233 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
ee31b337 RK |
234 | /* |
235 | * Turn off DTR and RTS early. | |
236 | */ | |
adc8d746 | 237 | if (!tty || (tty->termios.c_cflag & HUPCL)) |
ccce6deb | 238 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
ee31b337 | 239 | |
b922e19d | 240 | uart_port_shutdown(port); |
ee31b337 | 241 | } |
1da177e4 LT |
242 | |
243 | /* | |
d208a3bf DA |
244 | * It's possible for shutdown to be called after suspend if we get |
245 | * a DCD drop (hangup) at just the right time. Clear suspended bit so | |
246 | * we don't try to resume a port that has been shutdown. | |
1da177e4 | 247 | */ |
d208a3bf | 248 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
249 | |
250 | /* | |
251 | * Free the transmit buffer page. | |
252 | */ | |
ebd2c8f6 AC |
253 | if (state->xmit.buf) { |
254 | free_page((unsigned long)state->xmit.buf); | |
255 | state->xmit.buf = NULL; | |
1da177e4 | 256 | } |
1da177e4 LT |
257 | } |
258 | ||
259 | /** | |
260 | * uart_update_timeout - update per-port FIFO timeout. | |
261 | * @port: uart_port structure describing the port | |
262 | * @cflag: termios cflag value | |
263 | * @baud: speed of the port | |
264 | * | |
265 | * Set the port FIFO timeout value. The @cflag value should | |
266 | * reflect the actual hardware settings. | |
267 | */ | |
268 | void | |
269 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
270 | unsigned int baud) | |
271 | { | |
272 | unsigned int bits; | |
273 | ||
274 | /* byte size and parity */ | |
275 | switch (cflag & CSIZE) { | |
276 | case CS5: | |
277 | bits = 7; | |
278 | break; | |
279 | case CS6: | |
280 | bits = 8; | |
281 | break; | |
282 | case CS7: | |
283 | bits = 9; | |
284 | break; | |
285 | default: | |
286 | bits = 10; | |
a46c9994 | 287 | break; /* CS8 */ |
1da177e4 LT |
288 | } |
289 | ||
290 | if (cflag & CSTOPB) | |
291 | bits++; | |
292 | if (cflag & PARENB) | |
293 | bits++; | |
294 | ||
295 | /* | |
296 | * The total number of bits to be transmitted in the fifo. | |
297 | */ | |
298 | bits = bits * port->fifosize; | |
299 | ||
300 | /* | |
301 | * Figure the timeout to send the above number of bits. | |
302 | * Add .02 seconds of slop | |
303 | */ | |
304 | port->timeout = (HZ * bits) / baud + HZ/50; | |
305 | } | |
306 | ||
307 | EXPORT_SYMBOL(uart_update_timeout); | |
308 | ||
309 | /** | |
310 | * uart_get_baud_rate - return baud rate for a particular port | |
311 | * @port: uart_port structure describing the port in question. | |
312 | * @termios: desired termios settings. | |
313 | * @old: old termios (or NULL) | |
314 | * @min: minimum acceptable baud rate | |
315 | * @max: maximum acceptable baud rate | |
316 | * | |
317 | * Decode the termios structure into a numeric baud rate, | |
318 | * taking account of the magic 38400 baud rate (with spd_* | |
319 | * flags), and mapping the %B0 rate to 9600 baud. | |
320 | * | |
321 | * If the new baud rate is invalid, try the old termios setting. | |
322 | * If it's still invalid, we try 9600 baud. | |
323 | * | |
324 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
325 | * we're actually going to be using. Don't do this for the case |
326 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
327 | */ |
328 | unsigned int | |
606d099c AC |
329 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
330 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
331 | { |
332 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 333 | int hung_up = 0; |
0077d45e | 334 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
335 | |
336 | if (flags == UPF_SPD_HI) | |
337 | altbaud = 57600; | |
82cb7ba1 | 338 | else if (flags == UPF_SPD_VHI) |
1da177e4 | 339 | altbaud = 115200; |
82cb7ba1 | 340 | else if (flags == UPF_SPD_SHI) |
1da177e4 | 341 | altbaud = 230400; |
82cb7ba1 | 342 | else if (flags == UPF_SPD_WARP) |
1da177e4 LT |
343 | altbaud = 460800; |
344 | ||
345 | for (try = 0; try < 2; try++) { | |
346 | baud = tty_termios_baud_rate(termios); | |
347 | ||
348 | /* | |
349 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
350 | * Die! Die! Die! | |
351 | */ | |
352 | if (baud == 38400) | |
353 | baud = altbaud; | |
354 | ||
355 | /* | |
356 | * Special case: B0 rate. | |
357 | */ | |
eb424fd2 AC |
358 | if (baud == 0) { |
359 | hung_up = 1; | |
1da177e4 | 360 | baud = 9600; |
eb424fd2 | 361 | } |
1da177e4 LT |
362 | |
363 | if (baud >= min && baud <= max) | |
364 | return baud; | |
365 | ||
366 | /* | |
367 | * Oops, the quotient was zero. Try again with | |
368 | * the old baud rate if possible. | |
369 | */ | |
370 | termios->c_cflag &= ~CBAUD; | |
371 | if (old) { | |
6d4d67be | 372 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
373 | if (!hung_up) |
374 | tty_termios_encode_baud_rate(termios, | |
375 | baud, baud); | |
1da177e4 LT |
376 | old = NULL; |
377 | continue; | |
378 | } | |
379 | ||
380 | /* | |
16ae2a87 AC |
381 | * As a last resort, if the range cannot be met then clip to |
382 | * the nearest chip supported rate. | |
1da177e4 | 383 | */ |
16ae2a87 AC |
384 | if (!hung_up) { |
385 | if (baud <= min) | |
386 | tty_termios_encode_baud_rate(termios, | |
387 | min + 1, min + 1); | |
388 | else | |
389 | tty_termios_encode_baud_rate(termios, | |
390 | max - 1, max - 1); | |
391 | } | |
1da177e4 | 392 | } |
16ae2a87 AC |
393 | /* Should never happen */ |
394 | WARN_ON(1); | |
1da177e4 LT |
395 | return 0; |
396 | } | |
397 | ||
398 | EXPORT_SYMBOL(uart_get_baud_rate); | |
399 | ||
400 | /** | |
401 | * uart_get_divisor - return uart clock divisor | |
402 | * @port: uart_port structure describing the port. | |
403 | * @baud: desired baud rate | |
404 | * | |
405 | * Calculate the uart clock divisor for the port. | |
406 | */ | |
407 | unsigned int | |
408 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
409 | { | |
410 | unsigned int quot; | |
411 | ||
412 | /* | |
413 | * Old custom speed handling. | |
414 | */ | |
415 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
416 | quot = port->custom_divisor; | |
417 | else | |
97d24634 | 418 | quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); |
1da177e4 LT |
419 | |
420 | return quot; | |
421 | } | |
422 | ||
423 | EXPORT_SYMBOL(uart_get_divisor); | |
424 | ||
23d22cea | 425 | /* FIXME: Consistent locking policy */ |
19225135 AC |
426 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
427 | struct ktermios *old_termios) | |
1da177e4 | 428 | { |
ccce6deb | 429 | struct tty_port *port = &state->port; |
ccce6deb | 430 | struct uart_port *uport = state->uart_port; |
606d099c | 431 | struct ktermios *termios; |
1da177e4 LT |
432 | |
433 | /* | |
434 | * If we have no tty, termios, or the port does not exist, | |
435 | * then we can't set the parameters for this port. | |
436 | */ | |
adc8d746 | 437 | if (!tty || uport->type == PORT_UNKNOWN) |
1da177e4 LT |
438 | return; |
439 | ||
adc8d746 | 440 | termios = &tty->termios; |
1da177e4 LT |
441 | |
442 | /* | |
443 | * Set flags based on termios cflag | |
444 | */ | |
445 | if (termios->c_cflag & CRTSCTS) | |
ccce6deb | 446 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 | 447 | else |
ccce6deb | 448 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 LT |
449 | |
450 | if (termios->c_cflag & CLOCAL) | |
ccce6deb | 451 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 452 | else |
ccce6deb | 453 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 454 | |
ccce6deb | 455 | uport->ops->set_termios(uport, termios, old_termios); |
1da177e4 LT |
456 | } |
457 | ||
19225135 AC |
458 | static inline int __uart_put_char(struct uart_port *port, |
459 | struct circ_buf *circ, unsigned char c) | |
1da177e4 LT |
460 | { |
461 | unsigned long flags; | |
23d22cea | 462 | int ret = 0; |
1da177e4 LT |
463 | |
464 | if (!circ->buf) | |
23d22cea | 465 | return 0; |
1da177e4 LT |
466 | |
467 | spin_lock_irqsave(&port->lock, flags); | |
468 | if (uart_circ_chars_free(circ) != 0) { | |
469 | circ->buf[circ->head] = c; | |
470 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 471 | ret = 1; |
1da177e4 LT |
472 | } |
473 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 474 | return ret; |
1da177e4 LT |
475 | } |
476 | ||
23d22cea | 477 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
478 | { |
479 | struct uart_state *state = tty->driver_data; | |
480 | ||
ebd2c8f6 | 481 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
1da177e4 LT |
482 | } |
483 | ||
484 | static void uart_flush_chars(struct tty_struct *tty) | |
485 | { | |
486 | uart_start(tty); | |
487 | } | |
488 | ||
19225135 AC |
489 | static int uart_write(struct tty_struct *tty, |
490 | const unsigned char *buf, int count) | |
1da177e4 LT |
491 | { |
492 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
493 | struct uart_port *port; |
494 | struct circ_buf *circ; | |
1da177e4 LT |
495 | unsigned long flags; |
496 | int c, ret = 0; | |
497 | ||
d5f735e5 PM |
498 | /* |
499 | * This means you called this function _after_ the port was | |
500 | * closed. No cookie for you. | |
501 | */ | |
f751928e | 502 | if (!state) { |
d5f735e5 PM |
503 | WARN_ON(1); |
504 | return -EL3HLT; | |
505 | } | |
506 | ||
ebd2c8f6 AC |
507 | port = state->uart_port; |
508 | circ = &state->xmit; | |
d5f735e5 | 509 | |
1da177e4 LT |
510 | if (!circ->buf) |
511 | return 0; | |
512 | ||
513 | spin_lock_irqsave(&port->lock, flags); | |
514 | while (1) { | |
515 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
516 | if (count < c) | |
517 | c = count; | |
518 | if (c <= 0) | |
519 | break; | |
520 | memcpy(circ->buf + circ->head, buf, c); | |
521 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
522 | buf += c; | |
523 | count -= c; | |
524 | ret += c; | |
525 | } | |
526 | spin_unlock_irqrestore(&port->lock, flags); | |
527 | ||
528 | uart_start(tty); | |
529 | return ret; | |
530 | } | |
531 | ||
532 | static int uart_write_room(struct tty_struct *tty) | |
533 | { | |
534 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
535 | unsigned long flags; |
536 | int ret; | |
1da177e4 | 537 | |
ebd2c8f6 AC |
538 | spin_lock_irqsave(&state->uart_port->lock, flags); |
539 | ret = uart_circ_chars_free(&state->xmit); | |
540 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 541 | return ret; |
1da177e4 LT |
542 | } |
543 | ||
544 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
545 | { | |
546 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
547 | unsigned long flags; |
548 | int ret; | |
1da177e4 | 549 | |
ebd2c8f6 AC |
550 | spin_lock_irqsave(&state->uart_port->lock, flags); |
551 | ret = uart_circ_chars_pending(&state->xmit); | |
552 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 553 | return ret; |
1da177e4 LT |
554 | } |
555 | ||
556 | static void uart_flush_buffer(struct tty_struct *tty) | |
557 | { | |
558 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 559 | struct uart_port *port; |
1da177e4 LT |
560 | unsigned long flags; |
561 | ||
d5f735e5 PM |
562 | /* |
563 | * This means you called this function _after_ the port was | |
564 | * closed. No cookie for you. | |
565 | */ | |
f751928e | 566 | if (!state) { |
d5f735e5 PM |
567 | WARN_ON(1); |
568 | return; | |
569 | } | |
570 | ||
ebd2c8f6 | 571 | port = state->uart_port; |
eb3a1e11 | 572 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
573 | |
574 | spin_lock_irqsave(&port->lock, flags); | |
ebd2c8f6 | 575 | uart_circ_clear(&state->xmit); |
6bb0e3a5 HS |
576 | if (port->ops->flush_buffer) |
577 | port->ops->flush_buffer(port); | |
1da177e4 LT |
578 | spin_unlock_irqrestore(&port->lock, flags); |
579 | tty_wakeup(tty); | |
580 | } | |
581 | ||
582 | /* | |
583 | * This function is used to send a high-priority XON/XOFF character to | |
584 | * the device | |
585 | */ | |
586 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
587 | { | |
588 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 589 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
590 | unsigned long flags; |
591 | ||
592 | if (port->ops->send_xchar) | |
593 | port->ops->send_xchar(port, ch); | |
594 | else { | |
595 | port->x_char = ch; | |
596 | if (ch) { | |
597 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 598 | port->ops->start_tx(port); |
1da177e4 LT |
599 | spin_unlock_irqrestore(&port->lock, flags); |
600 | } | |
601 | } | |
602 | } | |
603 | ||
604 | static void uart_throttle(struct tty_struct *tty) | |
605 | { | |
606 | struct uart_state *state = tty->driver_data; | |
9aba8d5b RK |
607 | struct uart_port *port = state->uart_port; |
608 | uint32_t mask = 0; | |
1da177e4 LT |
609 | |
610 | if (I_IXOFF(tty)) | |
9aba8d5b RK |
611 | mask |= UPF_SOFT_FLOW; |
612 | if (tty->termios.c_cflag & CRTSCTS) | |
613 | mask |= UPF_HARD_FLOW; | |
614 | ||
615 | if (port->flags & mask) { | |
616 | port->ops->throttle(port); | |
617 | mask &= ~port->flags; | |
618 | } | |
619 | ||
620 | if (mask & UPF_SOFT_FLOW) | |
1da177e4 LT |
621 | uart_send_xchar(tty, STOP_CHAR(tty)); |
622 | ||
9aba8d5b RK |
623 | if (mask & UPF_HARD_FLOW) |
624 | uart_clear_mctrl(port, TIOCM_RTS); | |
1da177e4 LT |
625 | } |
626 | ||
627 | static void uart_unthrottle(struct tty_struct *tty) | |
628 | { | |
629 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 630 | struct uart_port *port = state->uart_port; |
9aba8d5b | 631 | uint32_t mask = 0; |
1da177e4 | 632 | |
9aba8d5b RK |
633 | if (I_IXOFF(tty)) |
634 | mask |= UPF_SOFT_FLOW; | |
635 | if (tty->termios.c_cflag & CRTSCTS) | |
636 | mask |= UPF_HARD_FLOW; | |
637 | ||
638 | if (port->flags & mask) { | |
639 | port->ops->unthrottle(port); | |
640 | mask &= ~port->flags; | |
641 | } | |
1da177e4 | 642 | |
9aba8d5b | 643 | if (mask & UPF_SOFT_FLOW) { |
1da177e4 LT |
644 | if (port->x_char) |
645 | port->x_char = 0; | |
646 | else | |
647 | uart_send_xchar(tty, START_CHAR(tty)); | |
648 | } | |
649 | ||
9aba8d5b | 650 | if (mask & UPF_HARD_FLOW) |
1da177e4 LT |
651 | uart_set_mctrl(port, TIOCM_RTS); |
652 | } | |
653 | ||
9f109694 | 654 | static void do_uart_get_info(struct tty_port *port, |
7ba2e769 | 655 | struct serial_struct *retinfo) |
1da177e4 | 656 | { |
9f109694 | 657 | struct uart_state *state = container_of(port, struct uart_state, port); |
a2bceae0 | 658 | struct uart_port *uport = state->uart_port; |
f34d7a5b | 659 | |
37cd0c99 | 660 | memset(retinfo, 0, sizeof(*retinfo)); |
f34d7a5b | 661 | |
7ba2e769 AC |
662 | retinfo->type = uport->type; |
663 | retinfo->line = uport->line; | |
664 | retinfo->port = uport->iobase; | |
1da177e4 | 665 | if (HIGH_BITS_OFFSET) |
7ba2e769 AC |
666 | retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
667 | retinfo->irq = uport->irq; | |
668 | retinfo->flags = uport->flags; | |
669 | retinfo->xmit_fifo_size = uport->fifosize; | |
670 | retinfo->baud_base = uport->uartclk / 16; | |
671 | retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; | |
672 | retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
1da177e4 | 673 | ASYNC_CLOSING_WAIT_NONE : |
4cb0fbfd | 674 | jiffies_to_msecs(port->closing_wait) / 10; |
7ba2e769 AC |
675 | retinfo->custom_divisor = uport->custom_divisor; |
676 | retinfo->hub6 = uport->hub6; | |
677 | retinfo->io_type = uport->iotype; | |
678 | retinfo->iomem_reg_shift = uport->regshift; | |
679 | retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; | |
680 | } | |
681 | ||
9f109694 AC |
682 | static void uart_get_info(struct tty_port *port, |
683 | struct serial_struct *retinfo) | |
7ba2e769 | 684 | { |
7ba2e769 AC |
685 | /* Ensure the state we copy is consistent and no hardware changes |
686 | occur as we go */ | |
687 | mutex_lock(&port->mutex); | |
9f109694 | 688 | do_uart_get_info(port, retinfo); |
a2bceae0 | 689 | mutex_unlock(&port->mutex); |
9f109694 AC |
690 | } |
691 | ||
692 | static int uart_get_info_user(struct tty_port *port, | |
693 | struct serial_struct __user *retinfo) | |
694 | { | |
695 | struct serial_struct tmp; | |
696 | uart_get_info(port, &tmp); | |
f34d7a5b | 697 | |
1da177e4 LT |
698 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
699 | return -EFAULT; | |
700 | return 0; | |
701 | } | |
702 | ||
7ba2e769 AC |
703 | static int uart_set_info(struct tty_struct *tty, struct tty_port *port, |
704 | struct uart_state *state, | |
705 | struct serial_struct *new_info) | |
1da177e4 | 706 | { |
46d57a44 | 707 | struct uart_port *uport = state->uart_port; |
1da177e4 | 708 | unsigned long new_port; |
0077d45e | 709 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 710 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 711 | upf_t old_flags, new_flags; |
1da177e4 LT |
712 | int retval = 0; |
713 | ||
7ba2e769 | 714 | new_port = new_info->port; |
1da177e4 | 715 | if (HIGH_BITS_OFFSET) |
7ba2e769 | 716 | new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; |
1da177e4 | 717 | |
7ba2e769 AC |
718 | new_info->irq = irq_canonicalize(new_info->irq); |
719 | close_delay = msecs_to_jiffies(new_info->close_delay * 10); | |
720 | closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
4cb0fbfd | 721 | ASYNC_CLOSING_WAIT_NONE : |
7ba2e769 | 722 | msecs_to_jiffies(new_info->closing_wait * 10); |
1da177e4 | 723 | |
1da177e4 | 724 | |
46d57a44 | 725 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
7ba2e769 | 726 | && new_info->irq != uport->irq; |
1da177e4 LT |
727 | |
728 | /* | |
729 | * Since changing the 'type' of the port changes its resource | |
730 | * allocations, we should treat type changes the same as | |
731 | * IO port changes. | |
732 | */ | |
46d57a44 AC |
733 | change_port = !(uport->flags & UPF_FIXED_PORT) |
734 | && (new_port != uport->iobase || | |
7ba2e769 AC |
735 | (unsigned long)new_info->iomem_base != uport->mapbase || |
736 | new_info->hub6 != uport->hub6 || | |
737 | new_info->io_type != uport->iotype || | |
738 | new_info->iomem_reg_shift != uport->regshift || | |
739 | new_info->type != uport->type); | |
46d57a44 AC |
740 | |
741 | old_flags = uport->flags; | |
7ba2e769 | 742 | new_flags = new_info->flags; |
46d57a44 | 743 | old_custom_divisor = uport->custom_divisor; |
1da177e4 LT |
744 | |
745 | if (!capable(CAP_SYS_ADMIN)) { | |
746 | retval = -EPERM; | |
747 | if (change_irq || change_port || | |
7ba2e769 | 748 | (new_info->baud_base != uport->uartclk / 16) || |
46d57a44 AC |
749 | (close_delay != port->close_delay) || |
750 | (closing_wait != port->closing_wait) || | |
7ba2e769 AC |
751 | (new_info->xmit_fifo_size && |
752 | new_info->xmit_fifo_size != uport->fifosize) || | |
0077d45e | 753 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 | 754 | goto exit; |
46d57a44 | 755 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
0077d45e | 756 | (new_flags & UPF_USR_MASK)); |
7ba2e769 | 757 | uport->custom_divisor = new_info->custom_divisor; |
1da177e4 LT |
758 | goto check_and_exit; |
759 | } | |
760 | ||
761 | /* | |
762 | * Ask the low level driver to verify the settings. | |
763 | */ | |
46d57a44 | 764 | if (uport->ops->verify_port) |
7ba2e769 | 765 | retval = uport->ops->verify_port(uport, new_info); |
1da177e4 | 766 | |
7ba2e769 AC |
767 | if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || |
768 | (new_info->baud_base < 9600)) | |
1da177e4 LT |
769 | retval = -EINVAL; |
770 | ||
771 | if (retval) | |
772 | goto exit; | |
773 | ||
774 | if (change_port || change_irq) { | |
775 | retval = -EBUSY; | |
776 | ||
777 | /* | |
778 | * Make sure that we are the sole user of this port. | |
779 | */ | |
b58d13a0 | 780 | if (tty_port_users(port) > 1) |
1da177e4 LT |
781 | goto exit; |
782 | ||
783 | /* | |
784 | * We need to shutdown the serial port at the old | |
785 | * port/type/irq combination. | |
786 | */ | |
19225135 | 787 | uart_shutdown(tty, state); |
1da177e4 LT |
788 | } |
789 | ||
790 | if (change_port) { | |
791 | unsigned long old_iobase, old_mapbase; | |
792 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
793 | ||
46d57a44 AC |
794 | old_iobase = uport->iobase; |
795 | old_mapbase = uport->mapbase; | |
796 | old_type = uport->type; | |
797 | old_hub6 = uport->hub6; | |
798 | old_iotype = uport->iotype; | |
799 | old_shift = uport->regshift; | |
1da177e4 LT |
800 | |
801 | /* | |
802 | * Free and release old regions | |
803 | */ | |
804 | if (old_type != PORT_UNKNOWN) | |
46d57a44 | 805 | uport->ops->release_port(uport); |
1da177e4 | 806 | |
46d57a44 | 807 | uport->iobase = new_port; |
7ba2e769 AC |
808 | uport->type = new_info->type; |
809 | uport->hub6 = new_info->hub6; | |
810 | uport->iotype = new_info->io_type; | |
811 | uport->regshift = new_info->iomem_reg_shift; | |
812 | uport->mapbase = (unsigned long)new_info->iomem_base; | |
1da177e4 LT |
813 | |
814 | /* | |
815 | * Claim and map the new regions | |
816 | */ | |
46d57a44 AC |
817 | if (uport->type != PORT_UNKNOWN) { |
818 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
819 | } else { |
820 | /* Always success - Jean II */ | |
821 | retval = 0; | |
822 | } | |
823 | ||
824 | /* | |
825 | * If we fail to request resources for the | |
826 | * new port, try to restore the old settings. | |
827 | */ | |
828 | if (retval && old_type != PORT_UNKNOWN) { | |
46d57a44 AC |
829 | uport->iobase = old_iobase; |
830 | uport->type = old_type; | |
831 | uport->hub6 = old_hub6; | |
832 | uport->iotype = old_iotype; | |
833 | uport->regshift = old_shift; | |
834 | uport->mapbase = old_mapbase; | |
835 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
836 | /* |
837 | * If we failed to restore the old settings, | |
838 | * we fail like this. | |
839 | */ | |
840 | if (retval) | |
46d57a44 | 841 | uport->type = PORT_UNKNOWN; |
1da177e4 LT |
842 | |
843 | /* | |
844 | * We failed anyway. | |
845 | */ | |
846 | retval = -EBUSY; | |
a46c9994 AC |
847 | /* Added to return the correct error -Ram Gupta */ |
848 | goto exit; | |
1da177e4 LT |
849 | } |
850 | } | |
851 | ||
abb4a239 | 852 | if (change_irq) |
7ba2e769 | 853 | uport->irq = new_info->irq; |
46d57a44 | 854 | if (!(uport->flags & UPF_FIXED_PORT)) |
7ba2e769 | 855 | uport->uartclk = new_info->baud_base * 16; |
46d57a44 | 856 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
0077d45e | 857 | (new_flags & UPF_CHANGE_MASK); |
7ba2e769 | 858 | uport->custom_divisor = new_info->custom_divisor; |
46d57a44 AC |
859 | port->close_delay = close_delay; |
860 | port->closing_wait = closing_wait; | |
7ba2e769 AC |
861 | if (new_info->xmit_fifo_size) |
862 | uport->fifosize = new_info->xmit_fifo_size; | |
d6c53c0e | 863 | port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
864 | |
865 | check_and_exit: | |
866 | retval = 0; | |
46d57a44 | 867 | if (uport->type == PORT_UNKNOWN) |
1da177e4 | 868 | goto exit; |
ccce6deb | 869 | if (port->flags & ASYNC_INITIALIZED) { |
46d57a44 AC |
870 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
871 | old_custom_divisor != uport->custom_divisor) { | |
1da177e4 LT |
872 | /* |
873 | * If they're setting up a custom divisor or speed, | |
874 | * instead of clearing it, then bitch about it. No | |
875 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
876 | */ | |
46d57a44 | 877 | if (uport->flags & UPF_SPD_MASK) { |
1da177e4 LT |
878 | char buf[64]; |
879 | printk(KERN_NOTICE | |
880 | "%s sets custom speed on %s. This " | |
881 | "is deprecated.\n", current->comm, | |
46d57a44 | 882 | tty_name(port->tty, buf)); |
1da177e4 | 883 | } |
19225135 | 884 | uart_change_speed(tty, state, NULL); |
1da177e4 LT |
885 | } |
886 | } else | |
19225135 | 887 | retval = uart_startup(tty, state, 1); |
1da177e4 | 888 | exit: |
7ba2e769 AC |
889 | return retval; |
890 | } | |
891 | ||
892 | static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, | |
893 | struct serial_struct __user *newinfo) | |
894 | { | |
895 | struct serial_struct new_serial; | |
896 | struct tty_port *port = &state->port; | |
897 | int retval; | |
898 | ||
899 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
900 | return -EFAULT; | |
901 | ||
902 | /* | |
903 | * This semaphore protects port->count. It is also | |
904 | * very useful to prevent opens. Also, take the | |
905 | * port configuration semaphore to make sure that a | |
906 | * module insertion/removal doesn't change anything | |
907 | * under us. | |
908 | */ | |
909 | mutex_lock(&port->mutex); | |
910 | retval = uart_set_info(tty, port, state, &new_serial); | |
a2bceae0 | 911 | mutex_unlock(&port->mutex); |
1da177e4 LT |
912 | return retval; |
913 | } | |
914 | ||
19225135 AC |
915 | /** |
916 | * uart_get_lsr_info - get line status register info | |
917 | * @tty: tty associated with the UART | |
918 | * @state: UART being queried | |
919 | * @value: returned modem value | |
920 | * | |
921 | * Note: uart_ioctl protects us against hangups. | |
1da177e4 | 922 | */ |
19225135 AC |
923 | static int uart_get_lsr_info(struct tty_struct *tty, |
924 | struct uart_state *state, unsigned int __user *value) | |
1da177e4 | 925 | { |
46d57a44 | 926 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
927 | unsigned int result; |
928 | ||
46d57a44 | 929 | result = uport->ops->tx_empty(uport); |
1da177e4 LT |
930 | |
931 | /* | |
932 | * If we're about to load something into the transmit | |
933 | * register, we'll pretend the transmitter isn't empty to | |
934 | * avoid a race condition (depending on when the transmit | |
935 | * interrupt happens). | |
936 | */ | |
46d57a44 | 937 | if (uport->x_char || |
ebd2c8f6 | 938 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
19225135 | 939 | !tty->stopped && !tty->hw_stopped)) |
1da177e4 | 940 | result &= ~TIOCSER_TEMT; |
a46c9994 | 941 | |
1da177e4 LT |
942 | return put_user(result, value); |
943 | } | |
944 | ||
60b33c13 | 945 | static int uart_tiocmget(struct tty_struct *tty) |
1da177e4 LT |
946 | { |
947 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 948 | struct tty_port *port = &state->port; |
46d57a44 | 949 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
950 | int result = -EIO; |
951 | ||
a2bceae0 | 952 | mutex_lock(&port->mutex); |
60b33c13 | 953 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 954 | result = uport->mctrl; |
46d57a44 AC |
955 | spin_lock_irq(&uport->lock); |
956 | result |= uport->ops->get_mctrl(uport); | |
957 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 958 | } |
a2bceae0 | 959 | mutex_unlock(&port->mutex); |
1da177e4 LT |
960 | |
961 | return result; | |
962 | } | |
963 | ||
964 | static int | |
20b9d177 | 965 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
1da177e4 LT |
966 | { |
967 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 968 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 969 | struct tty_port *port = &state->port; |
1da177e4 LT |
970 | int ret = -EIO; |
971 | ||
a2bceae0 | 972 | mutex_lock(&port->mutex); |
20b9d177 | 973 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 974 | uart_update_mctrl(uport, set, clear); |
1da177e4 LT |
975 | ret = 0; |
976 | } | |
a2bceae0 | 977 | mutex_unlock(&port->mutex); |
1da177e4 LT |
978 | return ret; |
979 | } | |
980 | ||
9e98966c | 981 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
982 | { |
983 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 984 | struct tty_port *port = &state->port; |
46d57a44 | 985 | struct uart_port *uport = state->uart_port; |
1da177e4 | 986 | |
a2bceae0 | 987 | mutex_lock(&port->mutex); |
1da177e4 | 988 | |
46d57a44 AC |
989 | if (uport->type != PORT_UNKNOWN) |
990 | uport->ops->break_ctl(uport, break_state); | |
1da177e4 | 991 | |
a2bceae0 | 992 | mutex_unlock(&port->mutex); |
9e98966c | 993 | return 0; |
1da177e4 LT |
994 | } |
995 | ||
19225135 | 996 | static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) |
1da177e4 | 997 | { |
46d57a44 | 998 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 999 | struct tty_port *port = &state->port; |
1da177e4 LT |
1000 | int flags, ret; |
1001 | ||
1002 | if (!capable(CAP_SYS_ADMIN)) | |
1003 | return -EPERM; | |
1004 | ||
1005 | /* | |
1006 | * Take the per-port semaphore. This prevents count from | |
1007 | * changing, and hence any extra opens of the port while | |
1008 | * we're auto-configuring. | |
1009 | */ | |
a2bceae0 | 1010 | if (mutex_lock_interruptible(&port->mutex)) |
1da177e4 LT |
1011 | return -ERESTARTSYS; |
1012 | ||
1013 | ret = -EBUSY; | |
b58d13a0 | 1014 | if (tty_port_users(port) == 1) { |
19225135 | 1015 | uart_shutdown(tty, state); |
1da177e4 LT |
1016 | |
1017 | /* | |
1018 | * If we already have a port type configured, | |
1019 | * we must release its resources. | |
1020 | */ | |
46d57a44 AC |
1021 | if (uport->type != PORT_UNKNOWN) |
1022 | uport->ops->release_port(uport); | |
1da177e4 LT |
1023 | |
1024 | flags = UART_CONFIG_TYPE; | |
46d57a44 | 1025 | if (uport->flags & UPF_AUTO_IRQ) |
1da177e4 LT |
1026 | flags |= UART_CONFIG_IRQ; |
1027 | ||
1028 | /* | |
1029 | * This will claim the ports resources if | |
1030 | * a port is found. | |
1031 | */ | |
46d57a44 | 1032 | uport->ops->config_port(uport, flags); |
1da177e4 | 1033 | |
19225135 | 1034 | ret = uart_startup(tty, state, 1); |
1da177e4 | 1035 | } |
a2bceae0 | 1036 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1037 | return ret; |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1042 | * - mask passed in arg for lines of interest | |
1043 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1044 | * Caller should use TIOCGICOUNT to see which one it was | |
bdc04e31 AC |
1045 | * |
1046 | * FIXME: This wants extracting into a common all driver implementation | |
1047 | * of TIOCMWAIT using tty_port. | |
1da177e4 LT |
1048 | */ |
1049 | static int | |
1050 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
1051 | { | |
46d57a44 | 1052 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 1053 | struct tty_port *port = &state->port; |
1da177e4 LT |
1054 | DECLARE_WAITQUEUE(wait, current); |
1055 | struct uart_icount cprev, cnow; | |
1056 | int ret; | |
1057 | ||
1058 | /* | |
1059 | * note the counters on entry | |
1060 | */ | |
46d57a44 AC |
1061 | spin_lock_irq(&uport->lock); |
1062 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); | |
1da177e4 LT |
1063 | |
1064 | /* | |
1065 | * Force modem status interrupts on | |
1066 | */ | |
46d57a44 AC |
1067 | uport->ops->enable_ms(uport); |
1068 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1069 | |
bdc04e31 | 1070 | add_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 | 1071 | for (;;) { |
46d57a44 AC |
1072 | spin_lock_irq(&uport->lock); |
1073 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1074 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1075 | |
1076 | set_current_state(TASK_INTERRUPTIBLE); | |
1077 | ||
1078 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1079 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1080 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1081 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1082 | ret = 0; |
1083 | break; | |
1da177e4 LT |
1084 | } |
1085 | ||
1086 | schedule(); | |
1087 | ||
1088 | /* see if a signal did it */ | |
1089 | if (signal_pending(current)) { | |
1090 | ret = -ERESTARTSYS; | |
1091 | break; | |
1092 | } | |
1093 | ||
1094 | cprev = cnow; | |
1095 | } | |
1096 | ||
1097 | current->state = TASK_RUNNING; | |
bdc04e31 | 1098 | remove_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 LT |
1099 | |
1100 | return ret; | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1105 | * Return: write counters to the user passed counter struct | |
1106 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1107 | * RI where only 0->1 is counted. | |
1108 | */ | |
d281da7f AC |
1109 | static int uart_get_icount(struct tty_struct *tty, |
1110 | struct serial_icounter_struct *icount) | |
1da177e4 | 1111 | { |
d281da7f | 1112 | struct uart_state *state = tty->driver_data; |
1da177e4 | 1113 | struct uart_icount cnow; |
46d57a44 | 1114 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1115 | |
46d57a44 AC |
1116 | spin_lock_irq(&uport->lock); |
1117 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1118 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1119 | |
d281da7f AC |
1120 | icount->cts = cnow.cts; |
1121 | icount->dsr = cnow.dsr; | |
1122 | icount->rng = cnow.rng; | |
1123 | icount->dcd = cnow.dcd; | |
1124 | icount->rx = cnow.rx; | |
1125 | icount->tx = cnow.tx; | |
1126 | icount->frame = cnow.frame; | |
1127 | icount->overrun = cnow.overrun; | |
1128 | icount->parity = cnow.parity; | |
1129 | icount->brk = cnow.brk; | |
1130 | icount->buf_overrun = cnow.buf_overrun; | |
1131 | ||
1132 | return 0; | |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | /* | |
e5238442 | 1136 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1137 | */ |
1138 | static int | |
6caa76b7 | 1139 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, |
1da177e4 LT |
1140 | unsigned long arg) |
1141 | { | |
1142 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1143 | struct tty_port *port = &state->port; |
1da177e4 LT |
1144 | void __user *uarg = (void __user *)arg; |
1145 | int ret = -ENOIOCTLCMD; | |
1146 | ||
1da177e4 LT |
1147 | |
1148 | /* | |
1149 | * These ioctls don't rely on the hardware to be present. | |
1150 | */ | |
1151 | switch (cmd) { | |
1152 | case TIOCGSERIAL: | |
9f109694 | 1153 | ret = uart_get_info_user(port, uarg); |
1da177e4 LT |
1154 | break; |
1155 | ||
1156 | case TIOCSSERIAL: | |
7ba2e769 | 1157 | ret = uart_set_info_user(tty, state, uarg); |
1da177e4 LT |
1158 | break; |
1159 | ||
1160 | case TIOCSERCONFIG: | |
19225135 | 1161 | ret = uart_do_autoconfig(tty, state); |
1da177e4 LT |
1162 | break; |
1163 | ||
1164 | case TIOCSERGWILD: /* obsolete */ | |
1165 | case TIOCSERSWILD: /* obsolete */ | |
1166 | ret = 0; | |
1167 | break; | |
1168 | } | |
1169 | ||
1170 | if (ret != -ENOIOCTLCMD) | |
1171 | goto out; | |
1172 | ||
1173 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1174 | ret = -EIO; | |
1175 | goto out; | |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * The following should only be used when hardware is present. | |
1180 | */ | |
1181 | switch (cmd) { | |
1182 | case TIOCMIWAIT: | |
1183 | ret = uart_wait_modem_status(state, arg); | |
1184 | break; | |
1da177e4 LT |
1185 | } |
1186 | ||
1187 | if (ret != -ENOIOCTLCMD) | |
1188 | goto out; | |
1189 | ||
a2bceae0 | 1190 | mutex_lock(&port->mutex); |
1da177e4 | 1191 | |
6caa76b7 | 1192 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
1da177e4 LT |
1193 | ret = -EIO; |
1194 | goto out_up; | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * All these rely on hardware being present and need to be | |
1199 | * protected against the tty being hung up. | |
1200 | */ | |
1201 | switch (cmd) { | |
1202 | case TIOCSERGETLSR: /* Get line status register */ | |
19225135 | 1203 | ret = uart_get_lsr_info(tty, state, uarg); |
1da177e4 LT |
1204 | break; |
1205 | ||
1206 | default: { | |
46d57a44 AC |
1207 | struct uart_port *uport = state->uart_port; |
1208 | if (uport->ops->ioctl) | |
1209 | ret = uport->ops->ioctl(uport, cmd, arg); | |
1da177e4 LT |
1210 | break; |
1211 | } | |
1212 | } | |
f34d7a5b | 1213 | out_up: |
a2bceae0 | 1214 | mutex_unlock(&port->mutex); |
f34d7a5b | 1215 | out: |
1da177e4 LT |
1216 | return ret; |
1217 | } | |
1218 | ||
edeb280e | 1219 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1220 | { |
1221 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1222 | struct uart_port *uport = state->uart_port; |
64e9159f | 1223 | |
46d57a44 | 1224 | if (uport->ops->set_ldisc) |
adc8d746 | 1225 | uport->ops->set_ldisc(uport, tty->termios.c_line); |
64e9159f AC |
1226 | } |
1227 | ||
a46c9994 AC |
1228 | static void uart_set_termios(struct tty_struct *tty, |
1229 | struct ktermios *old_termios) | |
1da177e4 LT |
1230 | { |
1231 | struct uart_state *state = tty->driver_data; | |
dec94e70 | 1232 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1233 | unsigned long flags; |
adc8d746 | 1234 | unsigned int cflag = tty->termios.c_cflag; |
2cbacafd RK |
1235 | unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; |
1236 | bool sw_changed = false; | |
1da177e4 | 1237 | |
2cbacafd RK |
1238 | /* |
1239 | * Drivers doing software flow control also need to know | |
1240 | * about changes to these input settings. | |
1241 | */ | |
1242 | if (uport->flags & UPF_SOFT_FLOW) { | |
1243 | iflag_mask |= IXANY|IXON|IXOFF; | |
1244 | sw_changed = | |
1245 | tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || | |
1246 | tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; | |
1247 | } | |
1da177e4 LT |
1248 | |
1249 | /* | |
1250 | * These are the bits that are used to setup various | |
20620d68 DW |
1251 | * flags in the low level driver. We can ignore the Bfoo |
1252 | * bits in c_cflag; c_[io]speed will always be set | |
1253 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 | 1254 | */ |
1da177e4 | 1255 | if ((cflag ^ old_termios->c_cflag) == 0 && |
adc8d746 AC |
1256 | tty->termios.c_ospeed == old_termios->c_ospeed && |
1257 | tty->termios.c_ispeed == old_termios->c_ispeed && | |
2cbacafd RK |
1258 | ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && |
1259 | !sw_changed) { | |
1da177e4 | 1260 | return; |
e5238442 | 1261 | } |
1da177e4 | 1262 | |
19225135 | 1263 | uart_change_speed(tty, state, old_termios); |
1da177e4 LT |
1264 | |
1265 | /* Handle transition to B0 status */ | |
1266 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
dec94e70 | 1267 | uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 1268 | /* Handle transition away from B0 status */ |
82cb7ba1 | 1269 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 LT |
1270 | unsigned int mask = TIOCM_DTR; |
1271 | if (!(cflag & CRTSCTS) || | |
1272 | !test_bit(TTY_THROTTLED, &tty->flags)) | |
1273 | mask |= TIOCM_RTS; | |
dec94e70 | 1274 | uart_set_mctrl(uport, mask); |
1da177e4 LT |
1275 | } |
1276 | ||
dba05832 RK |
1277 | /* |
1278 | * If the port is doing h/w assisted flow control, do nothing. | |
1279 | * We assume that tty->hw_stopped has never been set. | |
1280 | */ | |
1281 | if (uport->flags & UPF_HARD_FLOW) | |
1282 | return; | |
1283 | ||
1da177e4 LT |
1284 | /* Handle turning off CRTSCTS */ |
1285 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
dec94e70 | 1286 | spin_lock_irqsave(&uport->lock, flags); |
1da177e4 LT |
1287 | tty->hw_stopped = 0; |
1288 | __uart_start(tty); | |
dec94e70 | 1289 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 | 1290 | } |
0dd7a1ae | 1291 | /* Handle turning on CRTSCTS */ |
82cb7ba1 | 1292 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
dec94e70 RK |
1293 | spin_lock_irqsave(&uport->lock, flags); |
1294 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { | |
0dd7a1ae | 1295 | tty->hw_stopped = 1; |
dec94e70 | 1296 | uport->ops->stop_tx(uport); |
0dd7a1ae | 1297 | } |
dec94e70 | 1298 | spin_unlock_irqrestore(&uport->lock, flags); |
0dd7a1ae | 1299 | } |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | /* | |
ef4f527c KC |
1303 | * Calls to uart_close() are serialised via the tty_lock in |
1304 | * drivers/tty/tty_io.c:tty_release() | |
1305 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1306 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1307 | */ |
1308 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1309 | { | |
1310 | struct uart_state *state = tty->driver_data; | |
46d57a44 AC |
1311 | struct tty_port *port; |
1312 | struct uart_port *uport; | |
61cd8a21 | 1313 | unsigned long flags; |
a46c9994 | 1314 | |
eea7e17e LT |
1315 | if (!state) |
1316 | return; | |
1317 | ||
46d57a44 AC |
1318 | uport = state->uart_port; |
1319 | port = &state->port; | |
1da177e4 | 1320 | |
4ed94cd4 | 1321 | pr_debug("uart_close(%d) called\n", uport ? uport->line : -1); |
1da177e4 | 1322 | |
4ed94cd4 | 1323 | if (!port->count || tty_port_close_start(port, tty, filp) == 0) |
55956216 | 1324 | return; |
1da177e4 LT |
1325 | |
1326 | /* | |
1327 | * At this point, we stop accepting input. To do this, we | |
1328 | * disable the receive line status interrupts. | |
1329 | */ | |
ccce6deb | 1330 | if (port->flags & ASYNC_INITIALIZED) { |
1da177e4 | 1331 | unsigned long flags; |
eea7e17e | 1332 | spin_lock_irqsave(&uport->lock, flags); |
46d57a44 | 1333 | uport->ops->stop_rx(uport); |
eea7e17e | 1334 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 LT |
1335 | /* |
1336 | * Before we drop DTR, make sure the UART transmitter | |
1337 | * has completely drained; this is especially | |
1338 | * important if there is a transmit FIFO! | |
1339 | */ | |
1f33a51d | 1340 | uart_wait_until_sent(tty, uport->timeout); |
1da177e4 LT |
1341 | } |
1342 | ||
bafb0bd2 | 1343 | mutex_lock(&port->mutex); |
19225135 | 1344 | uart_shutdown(tty, state); |
1da177e4 LT |
1345 | uart_flush_buffer(tty); |
1346 | ||
a46c9994 AC |
1347 | tty_ldisc_flush(tty); |
1348 | ||
7b01478f | 1349 | tty_port_tty_set(port, NULL); |
61cd8a21 AC |
1350 | spin_lock_irqsave(&port->lock, flags); |
1351 | tty->closing = 0; | |
1da177e4 | 1352 | |
46d57a44 | 1353 | if (port->blocked_open) { |
61cd8a21 | 1354 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1355 | if (port->close_delay) |
4cb0fbfd JS |
1356 | msleep_interruptible( |
1357 | jiffies_to_msecs(port->close_delay)); | |
61cd8a21 | 1358 | spin_lock_irqsave(&port->lock, flags); |
46d57a44 | 1359 | } else if (!uart_console(uport)) { |
61cd8a21 | 1360 | spin_unlock_irqrestore(&port->lock, flags); |
6f538fe3 | 1361 | uart_change_pm(state, UART_PM_STATE_OFF); |
61cd8a21 | 1362 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1363 | } |
1364 | ||
1365 | /* | |
1366 | * Wake up anyone trying to open this port. | |
1367 | */ | |
ccce6deb | 1368 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
426929f8 | 1369 | clear_bit(ASYNCB_CLOSING, &port->flags); |
61cd8a21 | 1370 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1371 | wake_up_interruptible(&port->open_wait); |
426929f8 | 1372 | wake_up_interruptible(&port->close_wait); |
1da177e4 | 1373 | |
a2bceae0 | 1374 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1375 | } |
1376 | ||
1f33a51d | 1377 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
1da177e4 | 1378 | { |
1f33a51d JS |
1379 | struct uart_state *state = tty->driver_data; |
1380 | struct uart_port *port = state->uart_port; | |
1da177e4 LT |
1381 | unsigned long char_time, expire; |
1382 | ||
1da177e4 LT |
1383 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1384 | return; | |
1385 | ||
1386 | /* | |
1387 | * Set the check interval to be 1/5 of the estimated time to | |
1388 | * send a single character, and make it at least 1. The check | |
1389 | * interval should also be less than the timeout. | |
1390 | * | |
1391 | * Note: we have to use pretty tight timings here to satisfy | |
1392 | * the NIST-PCTS. | |
1393 | */ | |
1394 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1395 | char_time = char_time / 5; | |
1396 | if (char_time == 0) | |
1397 | char_time = 1; | |
1398 | if (timeout && timeout < char_time) | |
1399 | char_time = timeout; | |
1400 | ||
1401 | /* | |
1402 | * If the transmitter hasn't cleared in twice the approximate | |
1403 | * amount of time to send the entire FIFO, it probably won't | |
1404 | * ever clear. This assumes the UART isn't doing flow | |
1405 | * control, which is currently the case. Hence, if it ever | |
1406 | * takes longer than port->timeout, this is probably due to a | |
1407 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1408 | * 2*port->timeout. | |
1409 | */ | |
1410 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1411 | timeout = 2 * port->timeout; | |
1412 | ||
1413 | expire = jiffies + timeout; | |
1414 | ||
eb3a1e11 | 1415 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1416 | port->line, jiffies, expire); |
1da177e4 LT |
1417 | |
1418 | /* | |
1419 | * Check whether the transmitter is empty every 'char_time'. | |
1420 | * 'timeout' / 'expire' give us the maximum amount of time | |
1421 | * we wait. | |
1422 | */ | |
1423 | while (!port->ops->tx_empty(port)) { | |
1424 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1425 | if (signal_pending(current)) | |
1426 | break; | |
1427 | if (time_after(jiffies, expire)) | |
1428 | break; | |
1429 | } | |
20365219 AB |
1430 | } |
1431 | ||
1da177e4 | 1432 | /* |
ef4f527c KC |
1433 | * Calls to uart_hangup() are serialised by the tty_lock in |
1434 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1435 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1436 | */ |
1437 | static void uart_hangup(struct tty_struct *tty) | |
1438 | { | |
1439 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1440 | struct tty_port *port = &state->port; |
61cd8a21 | 1441 | unsigned long flags; |
1da177e4 | 1442 | |
ebd2c8f6 | 1443 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
1da177e4 | 1444 | |
a2bceae0 | 1445 | mutex_lock(&port->mutex); |
ccce6deb | 1446 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
1da177e4 | 1447 | uart_flush_buffer(tty); |
19225135 | 1448 | uart_shutdown(tty, state); |
61cd8a21 | 1449 | spin_lock_irqsave(&port->lock, flags); |
91312cdb | 1450 | port->count = 0; |
ccce6deb | 1451 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
61cd8a21 | 1452 | spin_unlock_irqrestore(&port->lock, flags); |
7b01478f | 1453 | tty_port_tty_set(port, NULL); |
bf903c0c GU |
1454 | if (!uart_console(state->uart_port)) |
1455 | uart_change_pm(state, UART_PM_STATE_OFF); | |
46d57a44 | 1456 | wake_up_interruptible(&port->open_wait); |
bdc04e31 | 1457 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 | 1458 | } |
a2bceae0 | 1459 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1460 | } |
1461 | ||
0b1db830 JS |
1462 | static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) |
1463 | { | |
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | static void uart_port_shutdown(struct tty_port *port) | |
1468 | { | |
b922e19d JS |
1469 | struct uart_state *state = container_of(port, struct uart_state, port); |
1470 | struct uart_port *uport = state->uart_port; | |
1471 | ||
1472 | /* | |
1473 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
1474 | * the irq here so the queue might never be woken up. Note | |
1475 | * that we won't end up waiting on delta_msr_wait again since | |
1476 | * any outstanding file descriptors should be pointing at | |
1477 | * hung_up_tty_fops now. | |
1478 | */ | |
1479 | wake_up_interruptible(&port->delta_msr_wait); | |
1480 | ||
1481 | /* | |
1482 | * Free the IRQ and disable the port. | |
1483 | */ | |
1484 | uport->ops->shutdown(uport); | |
1485 | ||
1486 | /* | |
1487 | * Ensure that the IRQ handler isn't running on another CPU. | |
1488 | */ | |
1489 | synchronize_irq(uport->irq); | |
0b1db830 JS |
1490 | } |
1491 | ||
de0c8cb3 AC |
1492 | static int uart_carrier_raised(struct tty_port *port) |
1493 | { | |
1494 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1495 | struct uart_port *uport = state->uart_port; | |
1496 | int mctrl; | |
de0c8cb3 AC |
1497 | spin_lock_irq(&uport->lock); |
1498 | uport->ops->enable_ms(uport); | |
1499 | mctrl = uport->ops->get_mctrl(uport); | |
1500 | spin_unlock_irq(&uport->lock); | |
de0c8cb3 AC |
1501 | if (mctrl & TIOCM_CAR) |
1502 | return 1; | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | static void uart_dtr_rts(struct tty_port *port, int onoff) | |
1507 | { | |
1508 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1509 | struct uart_port *uport = state->uart_port; | |
24fcc7c8 | 1510 | |
6f5c24ad | 1511 | if (onoff) |
de0c8cb3 AC |
1512 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
1513 | else | |
1514 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); | |
de0c8cb3 AC |
1515 | } |
1516 | ||
1da177e4 | 1517 | /* |
ef4f527c KC |
1518 | * Calls to uart_open are serialised by the tty_lock in |
1519 | * drivers/tty/tty_io.c:tty_open() | |
1da177e4 LT |
1520 | * Note that if this fails, then uart_close() _will_ be called. |
1521 | * | |
1522 | * In time, we want to scrap the "opening nonpresent ports" | |
1523 | * behaviour and implement an alternative way for setserial | |
1524 | * to set base addresses/ports/types. This will allow us to | |
1525 | * get rid of a certain amount of extra tests. | |
1526 | */ | |
1527 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1528 | { | |
1529 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1da177e4 | 1530 | int retval, line = tty->index; |
1c7b13c4 JS |
1531 | struct uart_state *state = drv->state + line; |
1532 | struct tty_port *port = &state->port; | |
1da177e4 | 1533 | |
eb3a1e11 | 1534 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 | 1535 | |
1da177e4 | 1536 | /* |
1c7b13c4 JS |
1537 | * We take the semaphore here to guarantee that we won't be re-entered |
1538 | * while allocating the state structure, or while we request any IRQs | |
1539 | * that the driver may need. This also has the nice side-effect that | |
1540 | * it delays the action of uart_hangup, so we can guarantee that | |
1541 | * state->port.tty will always contain something reasonable. | |
1da177e4 | 1542 | */ |
1c7b13c4 JS |
1543 | if (mutex_lock_interruptible(&port->mutex)) { |
1544 | retval = -ERESTARTSYS; | |
1545 | goto end; | |
1546 | } | |
1547 | ||
1548 | port->count++; | |
1549 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { | |
1550 | retval = -ENXIO; | |
1551 | goto err_dec_count; | |
1da177e4 LT |
1552 | } |
1553 | ||
1554 | /* | |
1555 | * Once we set tty->driver_data here, we are guaranteed that | |
1556 | * uart_close() will decrement the driver module use count. | |
1557 | * Any failures from here onwards should not touch the count. | |
1558 | */ | |
1559 | tty->driver_data = state; | |
ebd2c8f6 | 1560 | state->uart_port->state = state; |
d6c53c0e JS |
1561 | state->port.low_latency = |
1562 | (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
7b01478f | 1563 | tty_port_tty_set(port, tty); |
1da177e4 LT |
1564 | |
1565 | /* | |
1566 | * If the port is in the middle of closing, bail out now. | |
1567 | */ | |
1568 | if (tty_hung_up_p(filp)) { | |
1569 | retval = -EAGAIN; | |
1c7b13c4 | 1570 | goto err_dec_count; |
1da177e4 LT |
1571 | } |
1572 | ||
1573 | /* | |
1574 | * Make sure the device is in D0 state. | |
1575 | */ | |
91312cdb | 1576 | if (port->count == 1) |
6f538fe3 | 1577 | uart_change_pm(state, UART_PM_STATE_ON); |
1da177e4 LT |
1578 | |
1579 | /* | |
1580 | * Start up the serial port. | |
1581 | */ | |
19225135 | 1582 | retval = uart_startup(tty, state, 0); |
1da177e4 LT |
1583 | |
1584 | /* | |
1585 | * If we succeeded, wait until the port is ready. | |
1586 | */ | |
61cd8a21 | 1587 | mutex_unlock(&port->mutex); |
1da177e4 | 1588 | if (retval == 0) |
74c21077 | 1589 | retval = tty_port_block_til_ready(port, tty, filp); |
1da177e4 | 1590 | |
1c7b13c4 | 1591 | end: |
1da177e4 | 1592 | return retval; |
1c7b13c4 JS |
1593 | err_dec_count: |
1594 | port->count--; | |
1595 | mutex_unlock(&port->mutex); | |
1596 | goto end; | |
1da177e4 LT |
1597 | } |
1598 | ||
1599 | static const char *uart_type(struct uart_port *port) | |
1600 | { | |
1601 | const char *str = NULL; | |
1602 | ||
1603 | if (port->ops->type) | |
1604 | str = port->ops->type(port); | |
1605 | ||
1606 | if (!str) | |
1607 | str = "unknown"; | |
1608 | ||
1609 | return str; | |
1610 | } | |
1611 | ||
1612 | #ifdef CONFIG_PROC_FS | |
1613 | ||
d196a949 | 1614 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1da177e4 LT |
1615 | { |
1616 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 1617 | struct tty_port *port = &state->port; |
6f538fe3 | 1618 | enum uart_pm_state pm_state; |
a2bceae0 | 1619 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
1620 | char stat_buf[32]; |
1621 | unsigned int status; | |
d196a949 | 1622 | int mmio; |
1da177e4 | 1623 | |
a2bceae0 | 1624 | if (!uport) |
d196a949 | 1625 | return; |
1da177e4 | 1626 | |
a2bceae0 | 1627 | mmio = uport->iotype >= UPIO_MEM; |
d196a949 | 1628 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
a2bceae0 | 1629 | uport->line, uart_type(uport), |
6c6a2334 | 1630 | mmio ? "mmio:0x" : "port:", |
a2bceae0 AC |
1631 | mmio ? (unsigned long long)uport->mapbase |
1632 | : (unsigned long long)uport->iobase, | |
1633 | uport->irq); | |
1da177e4 | 1634 | |
a2bceae0 | 1635 | if (uport->type == PORT_UNKNOWN) { |
d196a949 AD |
1636 | seq_putc(m, '\n'); |
1637 | return; | |
1da177e4 LT |
1638 | } |
1639 | ||
a46c9994 | 1640 | if (capable(CAP_SYS_ADMIN)) { |
a2bceae0 | 1641 | mutex_lock(&port->mutex); |
3689a0ec | 1642 | pm_state = state->pm_state; |
6f538fe3 LW |
1643 | if (pm_state != UART_PM_STATE_ON) |
1644 | uart_change_pm(state, UART_PM_STATE_ON); | |
a2bceae0 AC |
1645 | spin_lock_irq(&uport->lock); |
1646 | status = uport->ops->get_mctrl(uport); | |
1647 | spin_unlock_irq(&uport->lock); | |
6f538fe3 | 1648 | if (pm_state != UART_PM_STATE_ON) |
3689a0ec | 1649 | uart_change_pm(state, pm_state); |
a2bceae0 | 1650 | mutex_unlock(&port->mutex); |
1da177e4 | 1651 | |
d196a949 | 1652 | seq_printf(m, " tx:%d rx:%d", |
a2bceae0 AC |
1653 | uport->icount.tx, uport->icount.rx); |
1654 | if (uport->icount.frame) | |
d196a949 | 1655 | seq_printf(m, " fe:%d", |
a2bceae0 AC |
1656 | uport->icount.frame); |
1657 | if (uport->icount.parity) | |
d196a949 | 1658 | seq_printf(m, " pe:%d", |
a2bceae0 AC |
1659 | uport->icount.parity); |
1660 | if (uport->icount.brk) | |
d196a949 | 1661 | seq_printf(m, " brk:%d", |
a2bceae0 AC |
1662 | uport->icount.brk); |
1663 | if (uport->icount.overrun) | |
d196a949 | 1664 | seq_printf(m, " oe:%d", |
a2bceae0 | 1665 | uport->icount.overrun); |
a46c9994 AC |
1666 | |
1667 | #define INFOBIT(bit, str) \ | |
a2bceae0 | 1668 | if (uport->mctrl & (bit)) \ |
1da177e4 LT |
1669 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1670 | strlen(stat_buf) - 2) | |
a46c9994 | 1671 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1672 | if (status & (bit)) \ |
1673 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1674 | strlen(stat_buf) - 2) | |
1675 | ||
1676 | stat_buf[0] = '\0'; | |
1677 | stat_buf[1] = '\0'; | |
1678 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1679 | STATBIT(TIOCM_CTS, "|CTS"); | |
1680 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1681 | STATBIT(TIOCM_DSR, "|DSR"); | |
1682 | STATBIT(TIOCM_CAR, "|CD"); | |
1683 | STATBIT(TIOCM_RNG, "|RI"); | |
1684 | if (stat_buf[0]) | |
1685 | stat_buf[0] = ' '; | |
a46c9994 | 1686 | |
d196a949 | 1687 | seq_puts(m, stat_buf); |
1da177e4 | 1688 | } |
d196a949 | 1689 | seq_putc(m, '\n'); |
1da177e4 LT |
1690 | #undef STATBIT |
1691 | #undef INFOBIT | |
1da177e4 LT |
1692 | } |
1693 | ||
d196a949 | 1694 | static int uart_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1695 | { |
833bb304 | 1696 | struct tty_driver *ttydrv = m->private; |
1da177e4 | 1697 | struct uart_driver *drv = ttydrv->driver_state; |
d196a949 | 1698 | int i; |
1da177e4 | 1699 | |
d196a949 | 1700 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
1da177e4 | 1701 | "", "", ""); |
d196a949 AD |
1702 | for (i = 0; i < drv->nr; i++) |
1703 | uart_line_info(m, drv, i); | |
1704 | return 0; | |
1da177e4 | 1705 | } |
d196a949 AD |
1706 | |
1707 | static int uart_proc_open(struct inode *inode, struct file *file) | |
1708 | { | |
d9dda78b | 1709 | return single_open(file, uart_proc_show, PDE_DATA(inode)); |
d196a949 AD |
1710 | } |
1711 | ||
1712 | static const struct file_operations uart_proc_fops = { | |
1713 | .owner = THIS_MODULE, | |
1714 | .open = uart_proc_open, | |
1715 | .read = seq_read, | |
1716 | .llseek = seq_lseek, | |
1717 | .release = single_release, | |
1718 | }; | |
1da177e4 LT |
1719 | #endif |
1720 | ||
4a1b5502 | 1721 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1722 | /* |
1723 | * uart_console_write - write a console message to a serial port | |
1724 | * @port: the port to write the message | |
1725 | * @s: array of characters | |
1726 | * @count: number of characters in string to write | |
1727 | * @write: function to write character to port | |
1728 | */ | |
1729 | void uart_console_write(struct uart_port *port, const char *s, | |
1730 | unsigned int count, | |
1731 | void (*putchar)(struct uart_port *, int)) | |
1732 | { | |
1733 | unsigned int i; | |
1734 | ||
1735 | for (i = 0; i < count; i++, s++) { | |
1736 | if (*s == '\n') | |
1737 | putchar(port, '\r'); | |
1738 | putchar(port, *s); | |
1739 | } | |
1740 | } | |
1741 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1742 | ||
1da177e4 LT |
1743 | /* |
1744 | * Check whether an invalid uart number has been specified, and | |
1745 | * if so, search for the first available port that does have | |
1746 | * console support. | |
1747 | */ | |
1748 | struct uart_port * __init | |
1749 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1750 | { | |
1751 | int idx = co->index; | |
1752 | ||
1753 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1754 | ports[idx].membase == NULL)) | |
1755 | for (idx = 0; idx < nr; idx++) | |
1756 | if (ports[idx].iobase != 0 || | |
1757 | ports[idx].membase != NULL) | |
1758 | break; | |
1759 | ||
1760 | co->index = idx; | |
1761 | ||
1762 | return ports + idx; | |
1763 | } | |
1764 | ||
1765 | /** | |
02088ca6 | 1766 | * uart_parse_options - Parse serial port baud/parity/bits/flow control. |
1da177e4 LT |
1767 | * @options: pointer to option string |
1768 | * @baud: pointer to an 'int' variable for the baud rate. | |
1769 | * @parity: pointer to an 'int' variable for the parity. | |
1770 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1771 | * @flow: pointer to an 'int' variable for the flow control character. | |
1772 | * | |
1773 | * uart_parse_options decodes a string containing the serial console | |
1774 | * options. The format of the string is <baud><parity><bits><flow>, | |
1775 | * eg: 115200n8r | |
1776 | */ | |
f2d937f3 | 1777 | void |
1da177e4 LT |
1778 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1779 | { | |
1780 | char *s = options; | |
1781 | ||
1782 | *baud = simple_strtoul(s, NULL, 10); | |
1783 | while (*s >= '0' && *s <= '9') | |
1784 | s++; | |
1785 | if (*s) | |
1786 | *parity = *s++; | |
1787 | if (*s) | |
1788 | *bits = *s++ - '0'; | |
1789 | if (*s) | |
1790 | *flow = *s; | |
1791 | } | |
f2d937f3 | 1792 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1793 | |
1794 | struct baud_rates { | |
1795 | unsigned int rate; | |
1796 | unsigned int cflag; | |
1797 | }; | |
1798 | ||
cb3592be | 1799 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1800 | { 921600, B921600 }, |
1801 | { 460800, B460800 }, | |
1802 | { 230400, B230400 }, | |
1803 | { 115200, B115200 }, | |
1804 | { 57600, B57600 }, | |
1805 | { 38400, B38400 }, | |
1806 | { 19200, B19200 }, | |
1807 | { 9600, B9600 }, | |
1808 | { 4800, B4800 }, | |
1809 | { 2400, B2400 }, | |
1810 | { 1200, B1200 }, | |
1811 | { 0, B38400 } | |
1812 | }; | |
1813 | ||
1814 | /** | |
1815 | * uart_set_options - setup the serial console parameters | |
1816 | * @port: pointer to the serial ports uart_port structure | |
1817 | * @co: console pointer | |
1818 | * @baud: baud rate | |
1819 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1820 | * @bits: number of data bits | |
1821 | * @flow: flow control character - 'r' (rts) | |
1822 | */ | |
f2d937f3 | 1823 | int |
1da177e4 LT |
1824 | uart_set_options(struct uart_port *port, struct console *co, |
1825 | int baud, int parity, int bits, int flow) | |
1826 | { | |
606d099c | 1827 | struct ktermios termios; |
149b36ea | 1828 | static struct ktermios dummy; |
1da177e4 LT |
1829 | int i; |
1830 | ||
976ecd12 RK |
1831 | /* |
1832 | * Ensure that the serial console lock is initialised | |
1833 | * early. | |
42b6a1ba RW |
1834 | * If this port is a console, then the spinlock is already |
1835 | * initialised. | |
976ecd12 | 1836 | */ |
42b6a1ba RW |
1837 | if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { |
1838 | spin_lock_init(&port->lock); | |
1839 | lockdep_set_class(&port->lock, &port_lock_key); | |
1840 | } | |
976ecd12 | 1841 | |
606d099c | 1842 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1843 | |
1844 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1845 | ||
1846 | /* | |
1847 | * Construct a cflag setting. | |
1848 | */ | |
1849 | for (i = 0; baud_rates[i].rate; i++) | |
1850 | if (baud_rates[i].rate <= baud) | |
1851 | break; | |
1852 | ||
1853 | termios.c_cflag |= baud_rates[i].cflag; | |
1854 | ||
1855 | if (bits == 7) | |
1856 | termios.c_cflag |= CS7; | |
1857 | else | |
1858 | termios.c_cflag |= CS8; | |
1859 | ||
1860 | switch (parity) { | |
1861 | case 'o': case 'O': | |
1862 | termios.c_cflag |= PARODD; | |
1863 | /*fall through*/ | |
1864 | case 'e': case 'E': | |
1865 | termios.c_cflag |= PARENB; | |
1866 | break; | |
1867 | } | |
1868 | ||
1869 | if (flow == 'r') | |
1870 | termios.c_cflag |= CRTSCTS; | |
1871 | ||
79492689 YL |
1872 | /* |
1873 | * some uarts on other side don't support no flow control. | |
1874 | * So we set * DTR in host uart to make them happy | |
1875 | */ | |
1876 | port->mctrl |= TIOCM_DTR; | |
1877 | ||
149b36ea | 1878 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1879 | /* |
1880 | * Allow the setting of the UART parameters with a NULL console | |
1881 | * too: | |
1882 | */ | |
1883 | if (co) | |
1884 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1885 | |
1886 | return 0; | |
1887 | } | |
f2d937f3 | 1888 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1889 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1890 | ||
cf75525f JS |
1891 | /** |
1892 | * uart_change_pm - set power state of the port | |
1893 | * | |
1894 | * @state: port descriptor | |
1895 | * @pm_state: new state | |
1896 | * | |
1897 | * Locking: port->mutex has to be held | |
1898 | */ | |
6f538fe3 LW |
1899 | static void uart_change_pm(struct uart_state *state, |
1900 | enum uart_pm_state pm_state) | |
1da177e4 | 1901 | { |
ebd2c8f6 | 1902 | struct uart_port *port = state->uart_port; |
1281e360 AV |
1903 | |
1904 | if (state->pm_state != pm_state) { | |
1905 | if (port->ops->pm) | |
1906 | port->ops->pm(port, pm_state, state->pm_state); | |
1907 | state->pm_state = pm_state; | |
1908 | } | |
1da177e4 LT |
1909 | } |
1910 | ||
b3b708fa GL |
1911 | struct uart_match { |
1912 | struct uart_port *port; | |
1913 | struct uart_driver *driver; | |
1914 | }; | |
1915 | ||
1916 | static int serial_match_port(struct device *dev, void *data) | |
1917 | { | |
1918 | struct uart_match *match = data; | |
7ca796f4 GL |
1919 | struct tty_driver *tty_drv = match->driver->tty_driver; |
1920 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
1921 | match->port->line; | |
b3b708fa GL |
1922 | |
1923 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1924 | } | |
1925 | ||
ccce6deb | 1926 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1927 | { |
ccce6deb AC |
1928 | struct uart_state *state = drv->state + uport->line; |
1929 | struct tty_port *port = &state->port; | |
b3b708fa | 1930 | struct device *tty_dev; |
ccce6deb | 1931 | struct uart_match match = {uport, drv}; |
1da177e4 | 1932 | |
a2bceae0 | 1933 | mutex_lock(&port->mutex); |
1da177e4 | 1934 | |
ccce6deb | 1935 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
b3b708fa | 1936 | if (device_may_wakeup(tty_dev)) { |
3f960dbb G |
1937 | if (!enable_irq_wake(uport->irq)) |
1938 | uport->irq_wake = 1; | |
b3b708fa | 1939 | put_device(tty_dev); |
a2bceae0 | 1940 | mutex_unlock(&port->mutex); |
b3b708fa GL |
1941 | return 0; |
1942 | } | |
5a65dcc0 FV |
1943 | put_device(tty_dev); |
1944 | ||
4547be78 SB |
1945 | if (console_suspend_enabled || !uart_console(uport)) |
1946 | uport->suspended = 1; | |
b3b708fa | 1947 | |
ccce6deb AC |
1948 | if (port->flags & ASYNC_INITIALIZED) { |
1949 | const struct uart_ops *ops = uport->ops; | |
c8c6bfa3 | 1950 | int tries; |
1da177e4 | 1951 | |
4547be78 SB |
1952 | if (console_suspend_enabled || !uart_console(uport)) { |
1953 | set_bit(ASYNCB_SUSPENDED, &port->flags); | |
1954 | clear_bit(ASYNCB_INITIALIZED, &port->flags); | |
a6b93a90 | 1955 | |
4547be78 SB |
1956 | spin_lock_irq(&uport->lock); |
1957 | ops->stop_tx(uport); | |
1958 | ops->set_mctrl(uport, 0); | |
1959 | ops->stop_rx(uport); | |
1960 | spin_unlock_irq(&uport->lock); | |
1961 | } | |
1da177e4 LT |
1962 | |
1963 | /* | |
1964 | * Wait for the transmitter to empty. | |
1965 | */ | |
ccce6deb | 1966 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
1da177e4 | 1967 | msleep(10); |
c8c6bfa3 | 1968 | if (!tries) |
a46c9994 AC |
1969 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
1970 | "transmitter\n", | |
ccce6deb AC |
1971 | uport->dev ? dev_name(uport->dev) : "", |
1972 | uport->dev ? ": " : "", | |
8440838b | 1973 | drv->dev_name, |
ccce6deb | 1974 | drv->tty_driver->name_base + uport->line); |
1da177e4 | 1975 | |
4547be78 SB |
1976 | if (console_suspend_enabled || !uart_console(uport)) |
1977 | ops->shutdown(uport); | |
1da177e4 LT |
1978 | } |
1979 | ||
1980 | /* | |
1981 | * Disable the console device before suspending. | |
1982 | */ | |
4547be78 | 1983 | if (console_suspend_enabled && uart_console(uport)) |
ccce6deb | 1984 | console_stop(uport->cons); |
1da177e4 | 1985 | |
4547be78 | 1986 | if (console_suspend_enabled || !uart_console(uport)) |
6f538fe3 | 1987 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 | 1988 | |
a2bceae0 | 1989 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1990 | |
1991 | return 0; | |
1992 | } | |
1993 | ||
ccce6deb | 1994 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1995 | { |
ccce6deb AC |
1996 | struct uart_state *state = drv->state + uport->line; |
1997 | struct tty_port *port = &state->port; | |
03a74dcc | 1998 | struct device *tty_dev; |
ccce6deb | 1999 | struct uart_match match = {uport, drv}; |
ba15ab0e | 2000 | struct ktermios termios; |
1da177e4 | 2001 | |
a2bceae0 | 2002 | mutex_lock(&port->mutex); |
1da177e4 | 2003 | |
ccce6deb AC |
2004 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
2005 | if (!uport->suspended && device_may_wakeup(tty_dev)) { | |
3f960dbb G |
2006 | if (uport->irq_wake) { |
2007 | disable_irq_wake(uport->irq); | |
2008 | uport->irq_wake = 0; | |
2009 | } | |
5a65dcc0 | 2010 | put_device(tty_dev); |
a2bceae0 | 2011 | mutex_unlock(&port->mutex); |
b3b708fa GL |
2012 | return 0; |
2013 | } | |
5a65dcc0 | 2014 | put_device(tty_dev); |
ccce6deb | 2015 | uport->suspended = 0; |
b3b708fa | 2016 | |
1da177e4 LT |
2017 | /* |
2018 | * Re-enable the console device after suspending. | |
2019 | */ | |
5933a161 | 2020 | if (uart_console(uport)) { |
891b9dd1 JW |
2021 | /* |
2022 | * First try to use the console cflag setting. | |
2023 | */ | |
2024 | memset(&termios, 0, sizeof(struct ktermios)); | |
2025 | termios.c_cflag = uport->cons->cflag; | |
2026 | ||
2027 | /* | |
2028 | * If that's unset, use the tty termios setting. | |
2029 | */ | |
adc8d746 AC |
2030 | if (port->tty && termios.c_cflag == 0) |
2031 | termios = port->tty->termios; | |
891b9dd1 | 2032 | |
94abc56f | 2033 | if (console_suspend_enabled) |
6f538fe3 | 2034 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb | 2035 | uport->ops->set_termios(uport, &termios, NULL); |
5933a161 YK |
2036 | if (console_suspend_enabled) |
2037 | console_start(uport->cons); | |
1da177e4 LT |
2038 | } |
2039 | ||
ccce6deb AC |
2040 | if (port->flags & ASYNC_SUSPENDED) { |
2041 | const struct uart_ops *ops = uport->ops; | |
ee31b337 | 2042 | int ret; |
1da177e4 | 2043 | |
6f538fe3 | 2044 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb AC |
2045 | spin_lock_irq(&uport->lock); |
2046 | ops->set_mctrl(uport, 0); | |
2047 | spin_unlock_irq(&uport->lock); | |
4547be78 | 2048 | if (console_suspend_enabled || !uart_console(uport)) { |
19225135 AC |
2049 | /* Protected by port mutex for now */ |
2050 | struct tty_struct *tty = port->tty; | |
4547be78 SB |
2051 | ret = ops->startup(uport); |
2052 | if (ret == 0) { | |
19225135 AC |
2053 | if (tty) |
2054 | uart_change_speed(tty, state, NULL); | |
4547be78 SB |
2055 | spin_lock_irq(&uport->lock); |
2056 | ops->set_mctrl(uport, uport->mctrl); | |
2057 | ops->start_tx(uport); | |
2058 | spin_unlock_irq(&uport->lock); | |
2059 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
2060 | } else { | |
2061 | /* | |
2062 | * Failed to resume - maybe hardware went away? | |
2063 | * Clear the "initialized" flag so we won't try | |
2064 | * to call the low level drivers shutdown method. | |
2065 | */ | |
19225135 | 2066 | uart_shutdown(tty, state); |
4547be78 | 2067 | } |
ee31b337 | 2068 | } |
a6b93a90 | 2069 | |
ccce6deb | 2070 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
2071 | } |
2072 | ||
a2bceae0 | 2073 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2074 | |
2075 | return 0; | |
2076 | } | |
2077 | ||
2078 | static inline void | |
2079 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2080 | { | |
30b7a3bc RK |
2081 | char address[64]; |
2082 | ||
1da177e4 LT |
2083 | switch (port->iotype) { |
2084 | case UPIO_PORT: | |
9bde10a4 | 2085 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2086 | break; |
2087 | case UPIO_HUB6: | |
30b7a3bc | 2088 | snprintf(address, sizeof(address), |
9bde10a4 | 2089 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2090 | break; |
2091 | case UPIO_MEM: | |
2092 | case UPIO_MEM32: | |
21c614a7 | 2093 | case UPIO_AU: |
3be91ec7 | 2094 | case UPIO_TSI: |
30b7a3bc | 2095 | snprintf(address, sizeof(address), |
4f640efb | 2096 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2097 | break; |
2098 | default: | |
2099 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2100 | break; |
2101 | } | |
30b7a3bc | 2102 | |
7d12b976 | 2103 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n", |
4bfe090b | 2104 | port->dev ? dev_name(port->dev) : "", |
0cf669d5 | 2105 | port->dev ? ": " : "", |
8440838b DM |
2106 | drv->dev_name, |
2107 | drv->tty_driver->name_base + port->line, | |
7d12b976 | 2108 | address, port->irq, port->uartclk / 16, uart_type(port)); |
1da177e4 LT |
2109 | } |
2110 | ||
2111 | static void | |
2112 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2113 | struct uart_port *port) | |
2114 | { | |
2115 | unsigned int flags; | |
2116 | ||
2117 | /* | |
2118 | * If there isn't a port here, don't do anything further. | |
2119 | */ | |
2120 | if (!port->iobase && !port->mapbase && !port->membase) | |
2121 | return; | |
2122 | ||
2123 | /* | |
2124 | * Now do the auto configuration stuff. Note that config_port | |
2125 | * is expected to claim the resources and map the port for us. | |
2126 | */ | |
8e23fcc8 | 2127 | flags = 0; |
1da177e4 LT |
2128 | if (port->flags & UPF_AUTO_IRQ) |
2129 | flags |= UART_CONFIG_IRQ; | |
2130 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2131 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2132 | port->type = PORT_UNKNOWN; | |
2133 | flags |= UART_CONFIG_TYPE; | |
2134 | } | |
1da177e4 LT |
2135 | port->ops->config_port(port, flags); |
2136 | } | |
2137 | ||
2138 | if (port->type != PORT_UNKNOWN) { | |
2139 | unsigned long flags; | |
2140 | ||
2141 | uart_report_port(drv, port); | |
2142 | ||
3689a0ec | 2143 | /* Power up port for set_mctrl() */ |
6f538fe3 | 2144 | uart_change_pm(state, UART_PM_STATE_ON); |
3689a0ec | 2145 | |
1da177e4 LT |
2146 | /* |
2147 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2148 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2149 | * We probably don't need a spinlock around this, but |
2150 | */ | |
2151 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2152 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2153 | spin_unlock_irqrestore(&port->lock, flags); |
2154 | ||
97d97224 RK |
2155 | /* |
2156 | * If this driver supports console, and it hasn't been | |
2157 | * successfully registered yet, try to re-register it. | |
2158 | * It may be that the port was not available. | |
2159 | */ | |
2160 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2161 | register_console(port->cons); | |
2162 | ||
1da177e4 LT |
2163 | /* |
2164 | * Power down all ports by default, except the | |
2165 | * console if we have one. | |
2166 | */ | |
2167 | if (!uart_console(port)) | |
6f538fe3 | 2168 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 LT |
2169 | } |
2170 | } | |
2171 | ||
f2d937f3 JW |
2172 | #ifdef CONFIG_CONSOLE_POLL |
2173 | ||
2174 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2175 | { | |
2176 | struct uart_driver *drv = driver->driver_state; | |
2177 | struct uart_state *state = drv->state + line; | |
2178 | struct uart_port *port; | |
2179 | int baud = 9600; | |
2180 | int bits = 8; | |
2181 | int parity = 'n'; | |
2182 | int flow = 'n'; | |
c7f3e708 | 2183 | int ret; |
f2d937f3 | 2184 | |
ebd2c8f6 | 2185 | if (!state || !state->uart_port) |
f2d937f3 JW |
2186 | return -1; |
2187 | ||
ebd2c8f6 | 2188 | port = state->uart_port; |
f2d937f3 JW |
2189 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
2190 | return -1; | |
2191 | ||
c7f3e708 AV |
2192 | if (port->ops->poll_init) { |
2193 | struct tty_port *tport = &state->port; | |
2194 | ||
2195 | ret = 0; | |
2196 | mutex_lock(&tport->mutex); | |
2197 | /* | |
2198 | * We don't set ASYNCB_INITIALIZED as we only initialized the | |
2199 | * hw, e.g. state->xmit is still uninitialized. | |
2200 | */ | |
2201 | if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) | |
2202 | ret = port->ops->poll_init(port); | |
2203 | mutex_unlock(&tport->mutex); | |
2204 | if (ret) | |
2205 | return ret; | |
2206 | } | |
2207 | ||
f2d937f3 JW |
2208 | if (options) { |
2209 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2210 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2211 | } | |
2212 | ||
2213 | return 0; | |
2214 | } | |
2215 | ||
2216 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2217 | { | |
2218 | struct uart_driver *drv = driver->driver_state; | |
2219 | struct uart_state *state = drv->state + line; | |
2220 | struct uart_port *port; | |
2221 | ||
ebd2c8f6 | 2222 | if (!state || !state->uart_port) |
f2d937f3 JW |
2223 | return -1; |
2224 | ||
ebd2c8f6 | 2225 | port = state->uart_port; |
f2d937f3 JW |
2226 | return port->ops->poll_get_char(port); |
2227 | } | |
2228 | ||
2229 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2230 | { | |
2231 | struct uart_driver *drv = driver->driver_state; | |
2232 | struct uart_state *state = drv->state + line; | |
2233 | struct uart_port *port; | |
2234 | ||
ebd2c8f6 | 2235 | if (!state || !state->uart_port) |
f2d937f3 JW |
2236 | return; |
2237 | ||
ebd2c8f6 | 2238 | port = state->uart_port; |
f2d937f3 JW |
2239 | port->ops->poll_put_char(port, ch); |
2240 | } | |
2241 | #endif | |
2242 | ||
b68e31d0 | 2243 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2244 | .open = uart_open, |
2245 | .close = uart_close, | |
2246 | .write = uart_write, | |
2247 | .put_char = uart_put_char, | |
2248 | .flush_chars = uart_flush_chars, | |
2249 | .write_room = uart_write_room, | |
2250 | .chars_in_buffer= uart_chars_in_buffer, | |
2251 | .flush_buffer = uart_flush_buffer, | |
2252 | .ioctl = uart_ioctl, | |
2253 | .throttle = uart_throttle, | |
2254 | .unthrottle = uart_unthrottle, | |
2255 | .send_xchar = uart_send_xchar, | |
2256 | .set_termios = uart_set_termios, | |
64e9159f | 2257 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2258 | .stop = uart_stop, |
2259 | .start = uart_start, | |
2260 | .hangup = uart_hangup, | |
2261 | .break_ctl = uart_break_ctl, | |
2262 | .wait_until_sent= uart_wait_until_sent, | |
2263 | #ifdef CONFIG_PROC_FS | |
d196a949 | 2264 | .proc_fops = &uart_proc_fops, |
1da177e4 LT |
2265 | #endif |
2266 | .tiocmget = uart_tiocmget, | |
2267 | .tiocmset = uart_tiocmset, | |
d281da7f | 2268 | .get_icount = uart_get_icount, |
f2d937f3 JW |
2269 | #ifdef CONFIG_CONSOLE_POLL |
2270 | .poll_init = uart_poll_init, | |
2271 | .poll_get_char = uart_poll_get_char, | |
2272 | .poll_put_char = uart_poll_put_char, | |
2273 | #endif | |
1da177e4 LT |
2274 | }; |
2275 | ||
de0c8cb3 | 2276 | static const struct tty_port_operations uart_port_ops = { |
0b1db830 JS |
2277 | .activate = uart_port_activate, |
2278 | .shutdown = uart_port_shutdown, | |
de0c8cb3 AC |
2279 | .carrier_raised = uart_carrier_raised, |
2280 | .dtr_rts = uart_dtr_rts, | |
2281 | }; | |
2282 | ||
1da177e4 LT |
2283 | /** |
2284 | * uart_register_driver - register a driver with the uart core layer | |
2285 | * @drv: low level driver structure | |
2286 | * | |
2287 | * Register a uart driver with the core driver. We in turn register | |
2288 | * with the tty layer, and initialise the core driver per-port state. | |
2289 | * | |
2290 | * We have a proc file in /proc/tty/driver which is named after the | |
2291 | * normal driver. | |
2292 | * | |
2293 | * drv->port should be NULL, and the per-port structures should be | |
2294 | * registered using uart_add_one_port after this call has succeeded. | |
2295 | */ | |
2296 | int uart_register_driver(struct uart_driver *drv) | |
2297 | { | |
9e845abf | 2298 | struct tty_driver *normal; |
1da177e4 LT |
2299 | int i, retval; |
2300 | ||
2301 | BUG_ON(drv->state); | |
2302 | ||
2303 | /* | |
2304 | * Maybe we should be using a slab cache for this, especially if | |
2305 | * we have a large number of ports to handle. | |
2306 | */ | |
8f31bb39 | 2307 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2308 | if (!drv->state) |
2309 | goto out; | |
2310 | ||
9e845abf | 2311 | normal = alloc_tty_driver(drv->nr); |
1da177e4 | 2312 | if (!normal) |
9e845abf | 2313 | goto out_kfree; |
1da177e4 LT |
2314 | |
2315 | drv->tty_driver = normal; | |
2316 | ||
1da177e4 | 2317 | normal->driver_name = drv->driver_name; |
1da177e4 LT |
2318 | normal->name = drv->dev_name; |
2319 | normal->major = drv->major; | |
2320 | normal->minor_start = drv->minor; | |
2321 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2322 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2323 | normal->init_termios = tty_std_termios; | |
2324 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2325 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2326 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2327 | normal->driver_state = drv; |
2328 | tty_set_operations(normal, &uart_ops); | |
2329 | ||
2330 | /* | |
2331 | * Initialise the UART state(s). | |
2332 | */ | |
2333 | for (i = 0; i < drv->nr; i++) { | |
2334 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 2335 | struct tty_port *port = &state->port; |
1da177e4 | 2336 | |
a2bceae0 | 2337 | tty_port_init(port); |
de0c8cb3 | 2338 | port->ops = &uart_port_ops; |
4cb0fbfd JS |
2339 | port->close_delay = HZ / 2; /* .5 seconds */ |
2340 | port->closing_wait = 30 * HZ;/* 30 seconds */ | |
1da177e4 LT |
2341 | } |
2342 | ||
2343 | retval = tty_register_driver(normal); | |
9e845abf AGR |
2344 | if (retval >= 0) |
2345 | return retval; | |
2346 | ||
191c5f10 JS |
2347 | for (i = 0; i < drv->nr; i++) |
2348 | tty_port_destroy(&drv->state[i].port); | |
9e845abf AGR |
2349 | put_tty_driver(normal); |
2350 | out_kfree: | |
2351 | kfree(drv->state); | |
2352 | out: | |
2353 | return -ENOMEM; | |
1da177e4 LT |
2354 | } |
2355 | ||
2356 | /** | |
2357 | * uart_unregister_driver - remove a driver from the uart core layer | |
2358 | * @drv: low level driver structure | |
2359 | * | |
2360 | * Remove all references to a driver from the core driver. The low | |
2361 | * level driver must have removed all its ports via the | |
2362 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2363 | * (ie, drv->port == NULL) | |
2364 | */ | |
2365 | void uart_unregister_driver(struct uart_driver *drv) | |
2366 | { | |
2367 | struct tty_driver *p = drv->tty_driver; | |
191c5f10 JS |
2368 | unsigned int i; |
2369 | ||
1da177e4 LT |
2370 | tty_unregister_driver(p); |
2371 | put_tty_driver(p); | |
191c5f10 JS |
2372 | for (i = 0; i < drv->nr; i++) |
2373 | tty_port_destroy(&drv->state[i].port); | |
1da177e4 | 2374 | kfree(drv->state); |
1e66cded | 2375 | drv->state = NULL; |
1da177e4 LT |
2376 | drv->tty_driver = NULL; |
2377 | } | |
2378 | ||
2379 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2380 | { | |
2381 | struct uart_driver *p = co->data; | |
2382 | *index = co->index; | |
2383 | return p->tty_driver; | |
2384 | } | |
2385 | ||
6915c0e4 TH |
2386 | static ssize_t uart_get_attr_uartclk(struct device *dev, |
2387 | struct device_attribute *attr, char *buf) | |
2388 | { | |
bebe73e3 | 2389 | struct serial_struct tmp; |
6915c0e4 | 2390 | struct tty_port *port = dev_get_drvdata(dev); |
6915c0e4 | 2391 | |
9f109694 | 2392 | uart_get_info(port, &tmp); |
bebe73e3 | 2393 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); |
6915c0e4 TH |
2394 | } |
2395 | ||
373bac4c AC |
2396 | static ssize_t uart_get_attr_type(struct device *dev, |
2397 | struct device_attribute *attr, char *buf) | |
2398 | { | |
2399 | struct serial_struct tmp; | |
2400 | struct tty_port *port = dev_get_drvdata(dev); | |
2401 | ||
2402 | uart_get_info(port, &tmp); | |
2403 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); | |
2404 | } | |
2405 | static ssize_t uart_get_attr_line(struct device *dev, | |
2406 | struct device_attribute *attr, char *buf) | |
2407 | { | |
2408 | struct serial_struct tmp; | |
2409 | struct tty_port *port = dev_get_drvdata(dev); | |
2410 | ||
2411 | uart_get_info(port, &tmp); | |
2412 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); | |
2413 | } | |
2414 | ||
2415 | static ssize_t uart_get_attr_port(struct device *dev, | |
2416 | struct device_attribute *attr, char *buf) | |
2417 | { | |
2418 | struct serial_struct tmp; | |
2419 | struct tty_port *port = dev_get_drvdata(dev); | |
fd985e1d | 2420 | unsigned long ioaddr; |
373bac4c AC |
2421 | |
2422 | uart_get_info(port, &tmp); | |
fd985e1d AM |
2423 | ioaddr = tmp.port; |
2424 | if (HIGH_BITS_OFFSET) | |
2425 | ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; | |
2426 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); | |
373bac4c AC |
2427 | } |
2428 | ||
2429 | static ssize_t uart_get_attr_irq(struct device *dev, | |
2430 | struct device_attribute *attr, char *buf) | |
2431 | { | |
2432 | struct serial_struct tmp; | |
2433 | struct tty_port *port = dev_get_drvdata(dev); | |
2434 | ||
2435 | uart_get_info(port, &tmp); | |
2436 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); | |
2437 | } | |
2438 | ||
2439 | static ssize_t uart_get_attr_flags(struct device *dev, | |
2440 | struct device_attribute *attr, char *buf) | |
2441 | { | |
2442 | struct serial_struct tmp; | |
2443 | struct tty_port *port = dev_get_drvdata(dev); | |
2444 | ||
2445 | uart_get_info(port, &tmp); | |
2446 | return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); | |
2447 | } | |
2448 | ||
2449 | static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, | |
2450 | struct device_attribute *attr, char *buf) | |
2451 | { | |
2452 | struct serial_struct tmp; | |
2453 | struct tty_port *port = dev_get_drvdata(dev); | |
2454 | ||
2455 | uart_get_info(port, &tmp); | |
2456 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); | |
2457 | } | |
2458 | ||
2459 | ||
2460 | static ssize_t uart_get_attr_close_delay(struct device *dev, | |
2461 | struct device_attribute *attr, char *buf) | |
2462 | { | |
2463 | struct serial_struct tmp; | |
2464 | struct tty_port *port = dev_get_drvdata(dev); | |
2465 | ||
2466 | uart_get_info(port, &tmp); | |
2467 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); | |
2468 | } | |
2469 | ||
2470 | ||
2471 | static ssize_t uart_get_attr_closing_wait(struct device *dev, | |
2472 | struct device_attribute *attr, char *buf) | |
2473 | { | |
2474 | struct serial_struct tmp; | |
2475 | struct tty_port *port = dev_get_drvdata(dev); | |
2476 | ||
2477 | uart_get_info(port, &tmp); | |
2478 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); | |
2479 | } | |
2480 | ||
2481 | static ssize_t uart_get_attr_custom_divisor(struct device *dev, | |
2482 | struct device_attribute *attr, char *buf) | |
2483 | { | |
2484 | struct serial_struct tmp; | |
2485 | struct tty_port *port = dev_get_drvdata(dev); | |
2486 | ||
2487 | uart_get_info(port, &tmp); | |
2488 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); | |
2489 | } | |
2490 | ||
2491 | static ssize_t uart_get_attr_io_type(struct device *dev, | |
2492 | struct device_attribute *attr, char *buf) | |
2493 | { | |
2494 | struct serial_struct tmp; | |
2495 | struct tty_port *port = dev_get_drvdata(dev); | |
2496 | ||
2497 | uart_get_info(port, &tmp); | |
2498 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); | |
2499 | } | |
2500 | ||
2501 | static ssize_t uart_get_attr_iomem_base(struct device *dev, | |
2502 | struct device_attribute *attr, char *buf) | |
2503 | { | |
2504 | struct serial_struct tmp; | |
2505 | struct tty_port *port = dev_get_drvdata(dev); | |
2506 | ||
2507 | uart_get_info(port, &tmp); | |
2508 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); | |
2509 | } | |
2510 | ||
2511 | static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, | |
2512 | struct device_attribute *attr, char *buf) | |
2513 | { | |
2514 | struct serial_struct tmp; | |
2515 | struct tty_port *port = dev_get_drvdata(dev); | |
2516 | ||
2517 | uart_get_info(port, &tmp); | |
2518 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); | |
2519 | } | |
2520 | ||
2521 | static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); | |
2522 | static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); | |
2523 | static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); | |
2524 | static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); | |
2525 | static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); | |
2526 | static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); | |
6915c0e4 | 2527 | static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); |
373bac4c AC |
2528 | static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); |
2529 | static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); | |
2530 | static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); | |
2531 | static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); | |
2532 | static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); | |
2533 | static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); | |
6915c0e4 TH |
2534 | |
2535 | static struct attribute *tty_dev_attrs[] = { | |
373bac4c AC |
2536 | &dev_attr_type.attr, |
2537 | &dev_attr_line.attr, | |
2538 | &dev_attr_port.attr, | |
2539 | &dev_attr_irq.attr, | |
2540 | &dev_attr_flags.attr, | |
2541 | &dev_attr_xmit_fifo_size.attr, | |
6915c0e4 | 2542 | &dev_attr_uartclk.attr, |
373bac4c AC |
2543 | &dev_attr_close_delay.attr, |
2544 | &dev_attr_closing_wait.attr, | |
2545 | &dev_attr_custom_divisor.attr, | |
2546 | &dev_attr_io_type.attr, | |
2547 | &dev_attr_iomem_base.attr, | |
2548 | &dev_attr_iomem_reg_shift.attr, | |
6915c0e4 TH |
2549 | NULL, |
2550 | }; | |
2551 | ||
b1b79916 | 2552 | static const struct attribute_group tty_dev_attr_group = { |
6915c0e4 TH |
2553 | .attrs = tty_dev_attrs, |
2554 | }; | |
2555 | ||
2556 | static const struct attribute_group *tty_dev_attr_groups[] = { | |
2557 | &tty_dev_attr_group, | |
2558 | NULL | |
2559 | }; | |
2560 | ||
9f109694 | 2561 | |
1da177e4 LT |
2562 | /** |
2563 | * uart_add_one_port - attach a driver-defined port structure | |
2564 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2565 | * @uport: uart port structure to use for this port. |
1da177e4 LT |
2566 | * |
2567 | * This allows the driver to register its own uart_port structure | |
2568 | * with the core driver. The main purpose is to allow the low | |
2569 | * level uart drivers to expand uart_port, rather than having yet | |
2570 | * more levels of structures. | |
2571 | */ | |
a2bceae0 | 2572 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 LT |
2573 | { |
2574 | struct uart_state *state; | |
a2bceae0 | 2575 | struct tty_port *port; |
1da177e4 | 2576 | int ret = 0; |
b3b708fa | 2577 | struct device *tty_dev; |
1da177e4 LT |
2578 | |
2579 | BUG_ON(in_interrupt()); | |
2580 | ||
a2bceae0 | 2581 | if (uport->line >= drv->nr) |
1da177e4 LT |
2582 | return -EINVAL; |
2583 | ||
a2bceae0 AC |
2584 | state = drv->state + uport->line; |
2585 | port = &state->port; | |
1da177e4 | 2586 | |
f392ecfa | 2587 | mutex_lock(&port_mutex); |
a2bceae0 | 2588 | mutex_lock(&port->mutex); |
ebd2c8f6 | 2589 | if (state->uart_port) { |
1da177e4 LT |
2590 | ret = -EINVAL; |
2591 | goto out; | |
2592 | } | |
2593 | ||
a2bceae0 | 2594 | state->uart_port = uport; |
6f538fe3 | 2595 | state->pm_state = UART_PM_STATE_UNDEFINED; |
1da177e4 | 2596 | |
a2bceae0 AC |
2597 | uport->cons = drv->cons; |
2598 | uport->state = state; | |
1da177e4 | 2599 | |
976ecd12 RK |
2600 | /* |
2601 | * If this port is a console, then the spinlock is already | |
2602 | * initialised. | |
2603 | */ | |
a2bceae0 AC |
2604 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
2605 | spin_lock_init(&uport->lock); | |
2606 | lockdep_set_class(&uport->lock, &port_lock_key); | |
13e83599 | 2607 | } |
976ecd12 | 2608 | |
a2bceae0 | 2609 | uart_configure_port(drv, state, uport); |
1da177e4 LT |
2610 | |
2611 | /* | |
2612 | * Register the port whether it's detected or not. This allows | |
015355b7 | 2613 | * setserial to be used to alter this port's parameters. |
1da177e4 | 2614 | */ |
b1b79916 TH |
2615 | tty_dev = tty_port_register_device_attr(port, drv->tty_driver, |
2616 | uport->line, uport->dev, port, tty_dev_attr_groups); | |
b3b708fa | 2617 | if (likely(!IS_ERR(tty_dev))) { |
77359835 SG |
2618 | device_set_wakeup_capable(tty_dev, 1); |
2619 | } else { | |
b3b708fa | 2620 | printk(KERN_ERR "Cannot register tty device on line %d\n", |
a2bceae0 | 2621 | uport->line); |
77359835 | 2622 | } |
1da177e4 | 2623 | |
68ac64cd RK |
2624 | /* |
2625 | * Ensure UPF_DEAD is not set. | |
2626 | */ | |
a2bceae0 | 2627 | uport->flags &= ~UPF_DEAD; |
68ac64cd | 2628 | |
1da177e4 | 2629 | out: |
a2bceae0 | 2630 | mutex_unlock(&port->mutex); |
f392ecfa | 2631 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2632 | |
2633 | return ret; | |
2634 | } | |
2635 | ||
2636 | /** | |
2637 | * uart_remove_one_port - detach a driver defined port structure | |
2638 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2639 | * @uport: uart port structure for this port |
1da177e4 LT |
2640 | * |
2641 | * This unhooks (and hangs up) the specified port structure from the | |
2642 | * core driver. No further calls will be made to the low-level code | |
2643 | * for this port. | |
2644 | */ | |
a2bceae0 | 2645 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2646 | { |
a2bceae0 AC |
2647 | struct uart_state *state = drv->state + uport->line; |
2648 | struct tty_port *port = &state->port; | |
4c6d5b4d | 2649 | struct tty_struct *tty; |
b342dd51 | 2650 | int ret = 0; |
1da177e4 LT |
2651 | |
2652 | BUG_ON(in_interrupt()); | |
2653 | ||
a2bceae0 | 2654 | if (state->uart_port != uport) |
1da177e4 | 2655 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
a2bceae0 | 2656 | state->uart_port, uport); |
1da177e4 | 2657 | |
f392ecfa | 2658 | mutex_lock(&port_mutex); |
1da177e4 | 2659 | |
68ac64cd RK |
2660 | /* |
2661 | * Mark the port "dead" - this prevents any opens from | |
2662 | * succeeding while we shut down the port. | |
2663 | */ | |
a2bceae0 | 2664 | mutex_lock(&port->mutex); |
b342dd51 CG |
2665 | if (!state->uart_port) { |
2666 | mutex_unlock(&port->mutex); | |
2667 | ret = -EINVAL; | |
2668 | goto out; | |
2669 | } | |
a2bceae0 AC |
2670 | uport->flags |= UPF_DEAD; |
2671 | mutex_unlock(&port->mutex); | |
68ac64cd | 2672 | |
1da177e4 | 2673 | /* |
aa4148cf | 2674 | * Remove the devices from the tty layer |
1da177e4 | 2675 | */ |
a2bceae0 | 2676 | tty_unregister_device(drv->tty_driver, uport->line); |
1da177e4 | 2677 | |
4c6d5b4d GU |
2678 | tty = tty_port_tty_get(port); |
2679 | if (tty) { | |
a2bceae0 | 2680 | tty_vhangup(port->tty); |
4c6d5b4d GU |
2681 | tty_kref_put(tty); |
2682 | } | |
68ac64cd | 2683 | |
5f5c9ae5 GU |
2684 | /* |
2685 | * If the port is used as a console, unregister it | |
2686 | */ | |
2687 | if (uart_console(uport)) | |
2688 | unregister_console(uport->cons); | |
2689 | ||
68ac64cd RK |
2690 | /* |
2691 | * Free the port IO and memory resources, if any. | |
2692 | */ | |
a2bceae0 AC |
2693 | if (uport->type != PORT_UNKNOWN) |
2694 | uport->ops->release_port(uport); | |
68ac64cd RK |
2695 | |
2696 | /* | |
2697 | * Indicate that there isn't a port here anymore. | |
2698 | */ | |
a2bceae0 | 2699 | uport->type = PORT_UNKNOWN; |
68ac64cd | 2700 | |
ebd2c8f6 | 2701 | state->uart_port = NULL; |
b342dd51 | 2702 | out: |
f392ecfa | 2703 | mutex_unlock(&port_mutex); |
1da177e4 | 2704 | |
b342dd51 | 2705 | return ret; |
1da177e4 LT |
2706 | } |
2707 | ||
2708 | /* | |
2709 | * Are the two ports equivalent? | |
2710 | */ | |
2711 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2712 | { | |
2713 | if (port1->iotype != port2->iotype) | |
2714 | return 0; | |
2715 | ||
2716 | switch (port1->iotype) { | |
2717 | case UPIO_PORT: | |
2718 | return (port1->iobase == port2->iobase); | |
2719 | case UPIO_HUB6: | |
2720 | return (port1->iobase == port2->iobase) && | |
2721 | (port1->hub6 == port2->hub6); | |
2722 | case UPIO_MEM: | |
d21b55d3 SS |
2723 | case UPIO_MEM32: |
2724 | case UPIO_AU: | |
2725 | case UPIO_TSI: | |
1624f003 | 2726 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2727 | } |
2728 | return 0; | |
2729 | } | |
2730 | EXPORT_SYMBOL(uart_match_port); | |
2731 | ||
027d7dac JS |
2732 | /** |
2733 | * uart_handle_dcd_change - handle a change of carrier detect state | |
2734 | * @uport: uart_port structure for the open port | |
2735 | * @status: new carrier detect status, nonzero if active | |
2736 | */ | |
2737 | void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) | |
2738 | { | |
42381572 | 2739 | struct tty_port *port = &uport->state->port; |
43eca0ae | 2740 | struct tty_struct *tty = port->tty; |
42381572 | 2741 | struct tty_ldisc *ld = tty ? tty_ldisc_ref(tty) : NULL; |
027d7dac | 2742 | |
42381572 GS |
2743 | if (ld) { |
2744 | if (ld->ops->dcd_change) | |
2745 | ld->ops->dcd_change(tty, status); | |
2746 | tty_ldisc_deref(ld); | |
2747 | } | |
027d7dac JS |
2748 | |
2749 | uport->icount.dcd++; | |
027d7dac JS |
2750 | |
2751 | if (port->flags & ASYNC_CHECK_CD) { | |
2752 | if (status) | |
2753 | wake_up_interruptible(&port->open_wait); | |
43eca0ae AC |
2754 | else if (tty) |
2755 | tty_hangup(tty); | |
027d7dac | 2756 | } |
027d7dac JS |
2757 | } |
2758 | EXPORT_SYMBOL_GPL(uart_handle_dcd_change); | |
2759 | ||
2760 | /** | |
2761 | * uart_handle_cts_change - handle a change of clear-to-send state | |
2762 | * @uport: uart_port structure for the open port | |
2763 | * @status: new clear to send status, nonzero if active | |
2764 | */ | |
2765 | void uart_handle_cts_change(struct uart_port *uport, unsigned int status) | |
2766 | { | |
2767 | struct tty_port *port = &uport->state->port; | |
2768 | struct tty_struct *tty = port->tty; | |
2769 | ||
2770 | uport->icount.cts++; | |
2771 | ||
f21ec3d2 | 2772 | if (tty_port_cts_enabled(port)) { |
027d7dac JS |
2773 | if (tty->hw_stopped) { |
2774 | if (status) { | |
2775 | tty->hw_stopped = 0; | |
2776 | uport->ops->start_tx(uport); | |
2777 | uart_write_wakeup(uport); | |
2778 | } | |
2779 | } else { | |
2780 | if (!status) { | |
2781 | tty->hw_stopped = 1; | |
2782 | uport->ops->stop_tx(uport); | |
2783 | } | |
2784 | } | |
2785 | } | |
2786 | } | |
2787 | EXPORT_SYMBOL_GPL(uart_handle_cts_change); | |
2788 | ||
cf75525f JS |
2789 | /** |
2790 | * uart_insert_char - push a char to the uart layer | |
2791 | * | |
2792 | * User is responsible to call tty_flip_buffer_push when they are done with | |
2793 | * insertion. | |
2794 | * | |
2795 | * @port: corresponding port | |
2796 | * @status: state of the serial port RX buffer (LSR for 8250) | |
2797 | * @overrun: mask of overrun bits in @status | |
2798 | * @ch: character to push | |
2799 | * @flag: flag for the character (see TTY_NORMAL and friends) | |
2800 | */ | |
027d7dac JS |
2801 | void uart_insert_char(struct uart_port *port, unsigned int status, |
2802 | unsigned int overrun, unsigned int ch, unsigned int flag) | |
2803 | { | |
92a19f9c | 2804 | struct tty_port *tport = &port->state->port; |
027d7dac JS |
2805 | |
2806 | if ((status & port->ignore_status_mask & ~overrun) == 0) | |
92a19f9c | 2807 | if (tty_insert_flip_char(tport, ch, flag) == 0) |
dabfb351 | 2808 | ++port->icount.buf_overrun; |
027d7dac JS |
2809 | |
2810 | /* | |
2811 | * Overrun is special. Since it's reported immediately, | |
2812 | * it doesn't affect the current character. | |
2813 | */ | |
2814 | if (status & ~port->ignore_status_mask & overrun) | |
92a19f9c | 2815 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) |
dabfb351 | 2816 | ++port->icount.buf_overrun; |
027d7dac JS |
2817 | } |
2818 | EXPORT_SYMBOL_GPL(uart_insert_char); | |
2819 | ||
1da177e4 LT |
2820 | EXPORT_SYMBOL(uart_write_wakeup); |
2821 | EXPORT_SYMBOL(uart_register_driver); | |
2822 | EXPORT_SYMBOL(uart_unregister_driver); | |
2823 | EXPORT_SYMBOL(uart_suspend_port); | |
2824 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2825 | EXPORT_SYMBOL(uart_add_one_port); |
2826 | EXPORT_SYMBOL(uart_remove_one_port); | |
2827 | ||
2828 | MODULE_DESCRIPTION("Serial driver core"); | |
2829 | MODULE_LICENSE("GPL"); |