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