Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Driver core for serial ports |
3 | * | |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Copyright 1999 ARM Limited | |
7 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/tty.h> | |
027d7dac | 25 | #include <linux/tty_flip.h> |
1da177e4 LT |
26 | #include <linux/slab.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/console.h> | |
a208ffd2 | 29 | #include <linux/of.h> |
d196a949 AD |
30 | #include <linux/proc_fs.h> |
31 | #include <linux/seq_file.h> | |
1da177e4 LT |
32 | #include <linux/device.h> |
33 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ | |
ccce6deb | 34 | #include <linux/serial_core.h> |
1da177e4 | 35 | #include <linux/delay.h> |
f392ecfa | 36 | #include <linux/mutex.h> |
1da177e4 LT |
37 | |
38 | #include <asm/irq.h> | |
39 | #include <asm/uaccess.h> | |
40 | ||
1da177e4 LT |
41 | /* |
42 | * This is used to lock changes in serial line configuration. | |
43 | */ | |
f392ecfa | 44 | static DEFINE_MUTEX(port_mutex); |
1da177e4 | 45 | |
13e83599 IM |
46 | /* |
47 | * lockdep: port->lock is initialized in two places, but we | |
48 | * want only one lock-class: | |
49 | */ | |
50 | static struct lock_class_key port_lock_key; | |
51 | ||
1da177e4 LT |
52 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
53 | ||
19225135 | 54 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
a46c9994 | 55 | struct ktermios *old_termios); |
1f33a51d | 56 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
6f538fe3 LW |
57 | static void uart_change_pm(struct uart_state *state, |
58 | enum uart_pm_state pm_state); | |
1da177e4 | 59 | |
b922e19d JS |
60 | static void uart_port_shutdown(struct tty_port *port); |
61 | ||
1da177e4 LT |
62 | /* |
63 | * This routine is used by the interrupt handler to schedule processing in | |
64 | * the software interrupt portion of the driver. | |
65 | */ | |
66 | void uart_write_wakeup(struct uart_port *port) | |
67 | { | |
ebd2c8f6 | 68 | struct uart_state *state = port->state; |
d5f735e5 PM |
69 | /* |
70 | * This means you called this function _after_ the port was | |
71 | * closed. No cookie for you. | |
72 | */ | |
ebd2c8f6 | 73 | BUG_ON(!state); |
6a3e492b | 74 | tty_wakeup(state->port.tty); |
1da177e4 LT |
75 | } |
76 | ||
77 | static void uart_stop(struct tty_struct *tty) | |
78 | { | |
79 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 80 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
81 | unsigned long flags; |
82 | ||
83 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 84 | port->ops->stop_tx(port); |
1da177e4 LT |
85 | spin_unlock_irqrestore(&port->lock, flags); |
86 | } | |
87 | ||
88 | static void __uart_start(struct tty_struct *tty) | |
89 | { | |
90 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 91 | struct uart_port *port = state->uart_port; |
1da177e4 | 92 | |
717f3bba | 93 | if (!tty->stopped && !tty->hw_stopped) |
b129a8cc | 94 | port->ops->start_tx(port); |
1da177e4 LT |
95 | } |
96 | ||
97 | static void uart_start(struct tty_struct *tty) | |
98 | { | |
99 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 100 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
101 | unsigned long flags; |
102 | ||
103 | spin_lock_irqsave(&port->lock, flags); | |
104 | __uart_start(tty); | |
105 | spin_unlock_irqrestore(&port->lock, flags); | |
106 | } | |
107 | ||
1da177e4 LT |
108 | static inline void |
109 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) | |
110 | { | |
111 | unsigned long flags; | |
112 | unsigned int old; | |
113 | ||
114 | spin_lock_irqsave(&port->lock, flags); | |
115 | old = port->mctrl; | |
116 | port->mctrl = (old & ~clear) | set; | |
117 | if (old != port->mctrl) | |
118 | port->ops->set_mctrl(port, port->mctrl); | |
119 | spin_unlock_irqrestore(&port->lock, flags); | |
120 | } | |
121 | ||
a46c9994 AC |
122 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
123 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) | |
1da177e4 LT |
124 | |
125 | /* | |
126 | * Startup the port. This will be called once per open. All calls | |
df4f4dd4 | 127 | * will be serialised by the per-port mutex. |
1da177e4 | 128 | */ |
c0d92be6 JS |
129 | static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, |
130 | int init_hw) | |
1da177e4 | 131 | { |
46d57a44 AC |
132 | struct uart_port *uport = state->uart_port; |
133 | struct tty_port *port = &state->port; | |
1da177e4 LT |
134 | unsigned long page; |
135 | int retval = 0; | |
136 | ||
46d57a44 | 137 | if (uport->type == PORT_UNKNOWN) |
c0d92be6 | 138 | return 1; |
1da177e4 | 139 | |
7deb39ed TP |
140 | /* |
141 | * Make sure the device is in D0 state. | |
142 | */ | |
143 | uart_change_pm(state, UART_PM_STATE_ON); | |
144 | ||
1da177e4 LT |
145 | /* |
146 | * Initialise and allocate the transmit and temporary | |
147 | * buffer. | |
148 | */ | |
ebd2c8f6 | 149 | if (!state->xmit.buf) { |
df4f4dd4 | 150 | /* This is protected by the per port mutex */ |
1da177e4 LT |
151 | page = get_zeroed_page(GFP_KERNEL); |
152 | if (!page) | |
153 | return -ENOMEM; | |
154 | ||
ebd2c8f6 AC |
155 | state->xmit.buf = (unsigned char *) page; |
156 | uart_circ_clear(&state->xmit); | |
1da177e4 LT |
157 | } |
158 | ||
46d57a44 | 159 | retval = uport->ops->startup(uport); |
1da177e4 | 160 | if (retval == 0) { |
c7d7abff | 161 | if (uart_console(uport) && uport->cons->cflag) { |
adc8d746 | 162 | tty->termios.c_cflag = uport->cons->cflag; |
c7d7abff JS |
163 | uport->cons->cflag = 0; |
164 | } | |
165 | /* | |
166 | * Initialise the hardware port settings. | |
167 | */ | |
168 | uart_change_speed(tty, state, NULL); | |
1da177e4 | 169 | |
c7d7abff | 170 | if (init_hw) { |
1da177e4 LT |
171 | /* |
172 | * Setup the RTS and DTR signals once the | |
173 | * port is open and ready to respond. | |
174 | */ | |
adc8d746 | 175 | if (tty->termios.c_cflag & CBAUD) |
46d57a44 | 176 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 177 | } |
a6eec92e PH |
178 | |
179 | if (tty_port_cts_enabled(port)) { | |
46d57a44 AC |
180 | spin_lock_irq(&uport->lock); |
181 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) | |
19225135 | 182 | tty->hw_stopped = 1; |
46d57a44 | 183 | spin_unlock_irq(&uport->lock); |
0dd7a1ae | 184 | } |
1da177e4 LT |
185 | } |
186 | ||
0055197e JS |
187 | /* |
188 | * This is to allow setserial on this port. People may want to set | |
189 | * port/irq/type and then reconfigure the port properly if it failed | |
190 | * now. | |
191 | */ | |
1da177e4 | 192 | if (retval && capable(CAP_SYS_ADMIN)) |
c0d92be6 JS |
193 | return 1; |
194 | ||
195 | return retval; | |
196 | } | |
197 | ||
198 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, | |
199 | int init_hw) | |
200 | { | |
201 | struct tty_port *port = &state->port; | |
202 | int retval; | |
203 | ||
204 | if (port->flags & ASYNC_INITIALIZED) | |
205 | return 0; | |
206 | ||
207 | /* | |
208 | * Set the TTY IO error marker - we will only clear this | |
209 | * once we have successfully opened the port. | |
210 | */ | |
211 | set_bit(TTY_IO_ERROR, &tty->flags); | |
212 | ||
213 | retval = uart_port_startup(tty, state, init_hw); | |
214 | if (!retval) { | |
215 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
216 | clear_bit(TTY_IO_ERROR, &tty->flags); | |
217 | } else if (retval > 0) | |
1da177e4 LT |
218 | retval = 0; |
219 | ||
220 | return retval; | |
221 | } | |
222 | ||
223 | /* | |
224 | * This routine will shutdown a serial port; interrupts are disabled, and | |
225 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
226 | * uart_shutdown are serialised by the per-port semaphore. | |
227 | */ | |
19225135 | 228 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
1da177e4 | 229 | { |
ccce6deb | 230 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 231 | struct tty_port *port = &state->port; |
1da177e4 | 232 | |
1da177e4 | 233 | /* |
ee31b337 | 234 | * Set the TTY IO error marker |
1da177e4 | 235 | */ |
f751928e AC |
236 | if (tty) |
237 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 238 | |
bdc04e31 | 239 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
ee31b337 RK |
240 | /* |
241 | * Turn off DTR and RTS early. | |
242 | */ | |
ae84db96 PH |
243 | if (uart_console(uport) && tty) |
244 | uport->cons->cflag = tty->termios.c_cflag; | |
245 | ||
adc8d746 | 246 | if (!tty || (tty->termios.c_cflag & HUPCL)) |
ccce6deb | 247 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
ee31b337 | 248 | |
b922e19d | 249 | uart_port_shutdown(port); |
ee31b337 | 250 | } |
1da177e4 LT |
251 | |
252 | /* | |
d208a3bf DA |
253 | * It's possible for shutdown to be called after suspend if we get |
254 | * a DCD drop (hangup) at just the right time. Clear suspended bit so | |
255 | * we don't try to resume a port that has been shutdown. | |
1da177e4 | 256 | */ |
d208a3bf | 257 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
258 | |
259 | /* | |
260 | * Free the transmit buffer page. | |
261 | */ | |
ebd2c8f6 AC |
262 | if (state->xmit.buf) { |
263 | free_page((unsigned long)state->xmit.buf); | |
264 | state->xmit.buf = NULL; | |
1da177e4 | 265 | } |
1da177e4 LT |
266 | } |
267 | ||
268 | /** | |
269 | * uart_update_timeout - update per-port FIFO timeout. | |
270 | * @port: uart_port structure describing the port | |
271 | * @cflag: termios cflag value | |
272 | * @baud: speed of the port | |
273 | * | |
274 | * Set the port FIFO timeout value. The @cflag value should | |
275 | * reflect the actual hardware settings. | |
276 | */ | |
277 | void | |
278 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
279 | unsigned int baud) | |
280 | { | |
281 | unsigned int bits; | |
282 | ||
283 | /* byte size and parity */ | |
284 | switch (cflag & CSIZE) { | |
285 | case CS5: | |
286 | bits = 7; | |
287 | break; | |
288 | case CS6: | |
289 | bits = 8; | |
290 | break; | |
291 | case CS7: | |
292 | bits = 9; | |
293 | break; | |
294 | default: | |
295 | bits = 10; | |
a46c9994 | 296 | break; /* CS8 */ |
1da177e4 LT |
297 | } |
298 | ||
299 | if (cflag & CSTOPB) | |
300 | bits++; | |
301 | if (cflag & PARENB) | |
302 | bits++; | |
303 | ||
304 | /* | |
305 | * The total number of bits to be transmitted in the fifo. | |
306 | */ | |
307 | bits = bits * port->fifosize; | |
308 | ||
309 | /* | |
310 | * Figure the timeout to send the above number of bits. | |
311 | * Add .02 seconds of slop | |
312 | */ | |
313 | port->timeout = (HZ * bits) / baud + HZ/50; | |
314 | } | |
315 | ||
316 | EXPORT_SYMBOL(uart_update_timeout); | |
317 | ||
318 | /** | |
319 | * uart_get_baud_rate - return baud rate for a particular port | |
320 | * @port: uart_port structure describing the port in question. | |
321 | * @termios: desired termios settings. | |
322 | * @old: old termios (or NULL) | |
323 | * @min: minimum acceptable baud rate | |
324 | * @max: maximum acceptable baud rate | |
325 | * | |
326 | * Decode the termios structure into a numeric baud rate, | |
327 | * taking account of the magic 38400 baud rate (with spd_* | |
328 | * flags), and mapping the %B0 rate to 9600 baud. | |
329 | * | |
330 | * If the new baud rate is invalid, try the old termios setting. | |
331 | * If it's still invalid, we try 9600 baud. | |
332 | * | |
333 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
334 | * we're actually going to be using. Don't do this for the case |
335 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
336 | */ |
337 | unsigned int | |
606d099c AC |
338 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
339 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
340 | { |
341 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 342 | int hung_up = 0; |
0077d45e | 343 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
344 | |
345 | if (flags == UPF_SPD_HI) | |
346 | altbaud = 57600; | |
82cb7ba1 | 347 | else if (flags == UPF_SPD_VHI) |
1da177e4 | 348 | altbaud = 115200; |
82cb7ba1 | 349 | else if (flags == UPF_SPD_SHI) |
1da177e4 | 350 | altbaud = 230400; |
82cb7ba1 | 351 | else if (flags == UPF_SPD_WARP) |
1da177e4 LT |
352 | altbaud = 460800; |
353 | ||
354 | for (try = 0; try < 2; try++) { | |
355 | baud = tty_termios_baud_rate(termios); | |
356 | ||
357 | /* | |
358 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
359 | * Die! Die! Die! | |
360 | */ | |
361 | if (baud == 38400) | |
362 | baud = altbaud; | |
363 | ||
364 | /* | |
365 | * Special case: B0 rate. | |
366 | */ | |
eb424fd2 AC |
367 | if (baud == 0) { |
368 | hung_up = 1; | |
1da177e4 | 369 | baud = 9600; |
eb424fd2 | 370 | } |
1da177e4 LT |
371 | |
372 | if (baud >= min && baud <= max) | |
373 | return baud; | |
374 | ||
375 | /* | |
376 | * Oops, the quotient was zero. Try again with | |
377 | * the old baud rate if possible. | |
378 | */ | |
379 | termios->c_cflag &= ~CBAUD; | |
380 | if (old) { | |
6d4d67be | 381 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
382 | if (!hung_up) |
383 | tty_termios_encode_baud_rate(termios, | |
384 | baud, baud); | |
1da177e4 LT |
385 | old = NULL; |
386 | continue; | |
387 | } | |
388 | ||
389 | /* | |
16ae2a87 AC |
390 | * As a last resort, if the range cannot be met then clip to |
391 | * the nearest chip supported rate. | |
1da177e4 | 392 | */ |
16ae2a87 AC |
393 | if (!hung_up) { |
394 | if (baud <= min) | |
395 | tty_termios_encode_baud_rate(termios, | |
396 | min + 1, min + 1); | |
397 | else | |
398 | tty_termios_encode_baud_rate(termios, | |
399 | max - 1, max - 1); | |
400 | } | |
1da177e4 | 401 | } |
16ae2a87 AC |
402 | /* Should never happen */ |
403 | WARN_ON(1); | |
1da177e4 LT |
404 | return 0; |
405 | } | |
406 | ||
407 | EXPORT_SYMBOL(uart_get_baud_rate); | |
408 | ||
409 | /** | |
410 | * uart_get_divisor - return uart clock divisor | |
411 | * @port: uart_port structure describing the port. | |
412 | * @baud: desired baud rate | |
413 | * | |
414 | * Calculate the uart clock divisor for the port. | |
415 | */ | |
416 | unsigned int | |
417 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
418 | { | |
419 | unsigned int quot; | |
420 | ||
421 | /* | |
422 | * Old custom speed handling. | |
423 | */ | |
424 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
425 | quot = port->custom_divisor; | |
426 | else | |
97d24634 | 427 | quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); |
1da177e4 LT |
428 | |
429 | return quot; | |
430 | } | |
431 | ||
432 | EXPORT_SYMBOL(uart_get_divisor); | |
433 | ||
23d22cea | 434 | /* FIXME: Consistent locking policy */ |
19225135 AC |
435 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
436 | struct ktermios *old_termios) | |
1da177e4 | 437 | { |
ccce6deb | 438 | struct tty_port *port = &state->port; |
ccce6deb | 439 | struct uart_port *uport = state->uart_port; |
606d099c | 440 | struct ktermios *termios; |
1da177e4 LT |
441 | |
442 | /* | |
443 | * If we have no tty, termios, or the port does not exist, | |
444 | * then we can't set the parameters for this port. | |
445 | */ | |
adc8d746 | 446 | if (!tty || uport->type == PORT_UNKNOWN) |
1da177e4 LT |
447 | return; |
448 | ||
adc8d746 | 449 | termios = &tty->termios; |
c18b55fd | 450 | uport->ops->set_termios(uport, termios, old_termios); |
1da177e4 LT |
451 | |
452 | /* | |
453 | * Set flags based on termios cflag | |
454 | */ | |
455 | if (termios->c_cflag & CRTSCTS) | |
ccce6deb | 456 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 | 457 | else |
ccce6deb | 458 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
1da177e4 LT |
459 | |
460 | if (termios->c_cflag & CLOCAL) | |
ccce6deb | 461 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 | 462 | else |
ccce6deb | 463 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
1da177e4 LT |
464 | } |
465 | ||
19225135 AC |
466 | static inline int __uart_put_char(struct uart_port *port, |
467 | struct circ_buf *circ, unsigned char c) | |
1da177e4 LT |
468 | { |
469 | unsigned long flags; | |
23d22cea | 470 | int ret = 0; |
1da177e4 LT |
471 | |
472 | if (!circ->buf) | |
23d22cea | 473 | return 0; |
1da177e4 LT |
474 | |
475 | spin_lock_irqsave(&port->lock, flags); | |
476 | if (uart_circ_chars_free(circ) != 0) { | |
477 | circ->buf[circ->head] = c; | |
478 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 479 | ret = 1; |
1da177e4 LT |
480 | } |
481 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 482 | return ret; |
1da177e4 LT |
483 | } |
484 | ||
23d22cea | 485 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
486 | { |
487 | struct uart_state *state = tty->driver_data; | |
488 | ||
ebd2c8f6 | 489 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
1da177e4 LT |
490 | } |
491 | ||
492 | static void uart_flush_chars(struct tty_struct *tty) | |
493 | { | |
494 | uart_start(tty); | |
495 | } | |
496 | ||
19225135 AC |
497 | static int uart_write(struct tty_struct *tty, |
498 | const unsigned char *buf, int count) | |
1da177e4 LT |
499 | { |
500 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
501 | struct uart_port *port; |
502 | struct circ_buf *circ; | |
1da177e4 LT |
503 | unsigned long flags; |
504 | int c, ret = 0; | |
505 | ||
d5f735e5 PM |
506 | /* |
507 | * This means you called this function _after_ the port was | |
508 | * closed. No cookie for you. | |
509 | */ | |
f751928e | 510 | if (!state) { |
d5f735e5 PM |
511 | WARN_ON(1); |
512 | return -EL3HLT; | |
513 | } | |
514 | ||
ebd2c8f6 AC |
515 | port = state->uart_port; |
516 | circ = &state->xmit; | |
d5f735e5 | 517 | |
1da177e4 LT |
518 | if (!circ->buf) |
519 | return 0; | |
520 | ||
521 | spin_lock_irqsave(&port->lock, flags); | |
522 | while (1) { | |
523 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
524 | if (count < c) | |
525 | c = count; | |
526 | if (c <= 0) | |
527 | break; | |
528 | memcpy(circ->buf + circ->head, buf, c); | |
529 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
530 | buf += c; | |
531 | count -= c; | |
532 | ret += c; | |
533 | } | |
534 | spin_unlock_irqrestore(&port->lock, flags); | |
535 | ||
536 | uart_start(tty); | |
537 | return ret; | |
538 | } | |
539 | ||
540 | static int uart_write_room(struct tty_struct *tty) | |
541 | { | |
542 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
543 | unsigned long flags; |
544 | int ret; | |
1da177e4 | 545 | |
ebd2c8f6 AC |
546 | spin_lock_irqsave(&state->uart_port->lock, flags); |
547 | ret = uart_circ_chars_free(&state->xmit); | |
548 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 549 | return ret; |
1da177e4 LT |
550 | } |
551 | ||
552 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
553 | { | |
554 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
555 | unsigned long flags; |
556 | int ret; | |
1da177e4 | 557 | |
ebd2c8f6 AC |
558 | spin_lock_irqsave(&state->uart_port->lock, flags); |
559 | ret = uart_circ_chars_pending(&state->xmit); | |
560 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 561 | return ret; |
1da177e4 LT |
562 | } |
563 | ||
564 | static void uart_flush_buffer(struct tty_struct *tty) | |
565 | { | |
566 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 567 | struct uart_port *port; |
1da177e4 LT |
568 | unsigned long flags; |
569 | ||
d5f735e5 PM |
570 | /* |
571 | * This means you called this function _after_ the port was | |
572 | * closed. No cookie for you. | |
573 | */ | |
f751928e | 574 | if (!state) { |
d5f735e5 PM |
575 | WARN_ON(1); |
576 | return; | |
577 | } | |
578 | ||
ebd2c8f6 | 579 | port = state->uart_port; |
eb3a1e11 | 580 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
581 | |
582 | spin_lock_irqsave(&port->lock, flags); | |
ebd2c8f6 | 583 | uart_circ_clear(&state->xmit); |
6bb0e3a5 HS |
584 | if (port->ops->flush_buffer) |
585 | port->ops->flush_buffer(port); | |
1da177e4 LT |
586 | spin_unlock_irqrestore(&port->lock, flags); |
587 | tty_wakeup(tty); | |
588 | } | |
589 | ||
590 | /* | |
591 | * This function is used to send a high-priority XON/XOFF character to | |
592 | * the device | |
593 | */ | |
594 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
595 | { | |
596 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 597 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
598 | unsigned long flags; |
599 | ||
600 | if (port->ops->send_xchar) | |
601 | port->ops->send_xchar(port, ch); | |
602 | else { | |
603 | port->x_char = ch; | |
604 | if (ch) { | |
605 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 606 | port->ops->start_tx(port); |
1da177e4 LT |
607 | spin_unlock_irqrestore(&port->lock, flags); |
608 | } | |
609 | } | |
610 | } | |
611 | ||
612 | static void uart_throttle(struct tty_struct *tty) | |
613 | { | |
614 | struct uart_state *state = tty->driver_data; | |
9aba8d5b RK |
615 | struct uart_port *port = state->uart_port; |
616 | uint32_t mask = 0; | |
1da177e4 LT |
617 | |
618 | if (I_IXOFF(tty)) | |
9aba8d5b RK |
619 | mask |= UPF_SOFT_FLOW; |
620 | if (tty->termios.c_cflag & CRTSCTS) | |
621 | mask |= UPF_HARD_FLOW; | |
622 | ||
623 | if (port->flags & mask) { | |
624 | port->ops->throttle(port); | |
625 | mask &= ~port->flags; | |
626 | } | |
627 | ||
628 | if (mask & UPF_SOFT_FLOW) | |
1da177e4 LT |
629 | uart_send_xchar(tty, STOP_CHAR(tty)); |
630 | ||
9aba8d5b RK |
631 | if (mask & UPF_HARD_FLOW) |
632 | uart_clear_mctrl(port, TIOCM_RTS); | |
1da177e4 LT |
633 | } |
634 | ||
635 | static void uart_unthrottle(struct tty_struct *tty) | |
636 | { | |
637 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 638 | struct uart_port *port = state->uart_port; |
9aba8d5b | 639 | uint32_t mask = 0; |
1da177e4 | 640 | |
9aba8d5b RK |
641 | if (I_IXOFF(tty)) |
642 | mask |= UPF_SOFT_FLOW; | |
643 | if (tty->termios.c_cflag & CRTSCTS) | |
644 | mask |= UPF_HARD_FLOW; | |
645 | ||
646 | if (port->flags & mask) { | |
647 | port->ops->unthrottle(port); | |
648 | mask &= ~port->flags; | |
649 | } | |
1da177e4 | 650 | |
9aba8d5b | 651 | if (mask & UPF_SOFT_FLOW) { |
1da177e4 LT |
652 | if (port->x_char) |
653 | port->x_char = 0; | |
654 | else | |
655 | uart_send_xchar(tty, START_CHAR(tty)); | |
656 | } | |
657 | ||
9aba8d5b | 658 | if (mask & UPF_HARD_FLOW) |
1da177e4 LT |
659 | uart_set_mctrl(port, TIOCM_RTS); |
660 | } | |
661 | ||
9f109694 | 662 | static void do_uart_get_info(struct tty_port *port, |
7ba2e769 | 663 | struct serial_struct *retinfo) |
1da177e4 | 664 | { |
9f109694 | 665 | struct uart_state *state = container_of(port, struct uart_state, port); |
a2bceae0 | 666 | struct uart_port *uport = state->uart_port; |
f34d7a5b | 667 | |
37cd0c99 | 668 | memset(retinfo, 0, sizeof(*retinfo)); |
f34d7a5b | 669 | |
7ba2e769 AC |
670 | retinfo->type = uport->type; |
671 | retinfo->line = uport->line; | |
672 | retinfo->port = uport->iobase; | |
1da177e4 | 673 | if (HIGH_BITS_OFFSET) |
7ba2e769 AC |
674 | retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
675 | retinfo->irq = uport->irq; | |
676 | retinfo->flags = uport->flags; | |
677 | retinfo->xmit_fifo_size = uport->fifosize; | |
678 | retinfo->baud_base = uport->uartclk / 16; | |
679 | retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; | |
680 | retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
1da177e4 | 681 | ASYNC_CLOSING_WAIT_NONE : |
4cb0fbfd | 682 | jiffies_to_msecs(port->closing_wait) / 10; |
7ba2e769 AC |
683 | retinfo->custom_divisor = uport->custom_divisor; |
684 | retinfo->hub6 = uport->hub6; | |
685 | retinfo->io_type = uport->iotype; | |
686 | retinfo->iomem_reg_shift = uport->regshift; | |
687 | retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; | |
688 | } | |
689 | ||
9f109694 AC |
690 | static void uart_get_info(struct tty_port *port, |
691 | struct serial_struct *retinfo) | |
7ba2e769 | 692 | { |
7ba2e769 AC |
693 | /* Ensure the state we copy is consistent and no hardware changes |
694 | occur as we go */ | |
695 | mutex_lock(&port->mutex); | |
9f109694 | 696 | do_uart_get_info(port, retinfo); |
a2bceae0 | 697 | mutex_unlock(&port->mutex); |
9f109694 AC |
698 | } |
699 | ||
700 | static int uart_get_info_user(struct tty_port *port, | |
701 | struct serial_struct __user *retinfo) | |
702 | { | |
703 | struct serial_struct tmp; | |
704 | uart_get_info(port, &tmp); | |
f34d7a5b | 705 | |
1da177e4 LT |
706 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
707 | return -EFAULT; | |
708 | return 0; | |
709 | } | |
710 | ||
7ba2e769 AC |
711 | static int uart_set_info(struct tty_struct *tty, struct tty_port *port, |
712 | struct uart_state *state, | |
713 | struct serial_struct *new_info) | |
1da177e4 | 714 | { |
46d57a44 | 715 | struct uart_port *uport = state->uart_port; |
1da177e4 | 716 | unsigned long new_port; |
0077d45e | 717 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 718 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 719 | upf_t old_flags, new_flags; |
1da177e4 LT |
720 | int retval = 0; |
721 | ||
7ba2e769 | 722 | new_port = new_info->port; |
1da177e4 | 723 | if (HIGH_BITS_OFFSET) |
7ba2e769 | 724 | new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; |
1da177e4 | 725 | |
7ba2e769 AC |
726 | new_info->irq = irq_canonicalize(new_info->irq); |
727 | close_delay = msecs_to_jiffies(new_info->close_delay * 10); | |
728 | closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
4cb0fbfd | 729 | ASYNC_CLOSING_WAIT_NONE : |
7ba2e769 | 730 | msecs_to_jiffies(new_info->closing_wait * 10); |
1da177e4 | 731 | |
1da177e4 | 732 | |
46d57a44 | 733 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
7ba2e769 | 734 | && new_info->irq != uport->irq; |
1da177e4 LT |
735 | |
736 | /* | |
737 | * Since changing the 'type' of the port changes its resource | |
738 | * allocations, we should treat type changes the same as | |
739 | * IO port changes. | |
740 | */ | |
46d57a44 AC |
741 | change_port = !(uport->flags & UPF_FIXED_PORT) |
742 | && (new_port != uport->iobase || | |
7ba2e769 AC |
743 | (unsigned long)new_info->iomem_base != uport->mapbase || |
744 | new_info->hub6 != uport->hub6 || | |
745 | new_info->io_type != uport->iotype || | |
746 | new_info->iomem_reg_shift != uport->regshift || | |
747 | new_info->type != uport->type); | |
46d57a44 AC |
748 | |
749 | old_flags = uport->flags; | |
7ba2e769 | 750 | new_flags = new_info->flags; |
46d57a44 | 751 | old_custom_divisor = uport->custom_divisor; |
1da177e4 LT |
752 | |
753 | if (!capable(CAP_SYS_ADMIN)) { | |
754 | retval = -EPERM; | |
755 | if (change_irq || change_port || | |
7ba2e769 | 756 | (new_info->baud_base != uport->uartclk / 16) || |
46d57a44 AC |
757 | (close_delay != port->close_delay) || |
758 | (closing_wait != port->closing_wait) || | |
7ba2e769 AC |
759 | (new_info->xmit_fifo_size && |
760 | new_info->xmit_fifo_size != uport->fifosize) || | |
0077d45e | 761 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 | 762 | goto exit; |
46d57a44 | 763 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
0077d45e | 764 | (new_flags & UPF_USR_MASK)); |
7ba2e769 | 765 | uport->custom_divisor = new_info->custom_divisor; |
1da177e4 LT |
766 | goto check_and_exit; |
767 | } | |
768 | ||
769 | /* | |
770 | * Ask the low level driver to verify the settings. | |
771 | */ | |
46d57a44 | 772 | if (uport->ops->verify_port) |
7ba2e769 | 773 | retval = uport->ops->verify_port(uport, new_info); |
1da177e4 | 774 | |
7ba2e769 AC |
775 | if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || |
776 | (new_info->baud_base < 9600)) | |
1da177e4 LT |
777 | retval = -EINVAL; |
778 | ||
779 | if (retval) | |
780 | goto exit; | |
781 | ||
782 | if (change_port || change_irq) { | |
783 | retval = -EBUSY; | |
784 | ||
785 | /* | |
786 | * Make sure that we are the sole user of this port. | |
787 | */ | |
b58d13a0 | 788 | if (tty_port_users(port) > 1) |
1da177e4 LT |
789 | goto exit; |
790 | ||
791 | /* | |
792 | * We need to shutdown the serial port at the old | |
793 | * port/type/irq combination. | |
794 | */ | |
19225135 | 795 | uart_shutdown(tty, state); |
1da177e4 LT |
796 | } |
797 | ||
798 | if (change_port) { | |
799 | unsigned long old_iobase, old_mapbase; | |
800 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
801 | ||
46d57a44 AC |
802 | old_iobase = uport->iobase; |
803 | old_mapbase = uport->mapbase; | |
804 | old_type = uport->type; | |
805 | old_hub6 = uport->hub6; | |
806 | old_iotype = uport->iotype; | |
807 | old_shift = uport->regshift; | |
1da177e4 LT |
808 | |
809 | /* | |
810 | * Free and release old regions | |
811 | */ | |
812 | if (old_type != PORT_UNKNOWN) | |
46d57a44 | 813 | uport->ops->release_port(uport); |
1da177e4 | 814 | |
46d57a44 | 815 | uport->iobase = new_port; |
7ba2e769 AC |
816 | uport->type = new_info->type; |
817 | uport->hub6 = new_info->hub6; | |
818 | uport->iotype = new_info->io_type; | |
819 | uport->regshift = new_info->iomem_reg_shift; | |
820 | uport->mapbase = (unsigned long)new_info->iomem_base; | |
1da177e4 LT |
821 | |
822 | /* | |
823 | * Claim and map the new regions | |
824 | */ | |
46d57a44 AC |
825 | if (uport->type != PORT_UNKNOWN) { |
826 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
827 | } else { |
828 | /* Always success - Jean II */ | |
829 | retval = 0; | |
830 | } | |
831 | ||
832 | /* | |
833 | * If we fail to request resources for the | |
834 | * new port, try to restore the old settings. | |
835 | */ | |
7deb39ed | 836 | if (retval) { |
46d57a44 AC |
837 | uport->iobase = old_iobase; |
838 | uport->type = old_type; | |
839 | uport->hub6 = old_hub6; | |
840 | uport->iotype = old_iotype; | |
841 | uport->regshift = old_shift; | |
842 | uport->mapbase = old_mapbase; | |
1da177e4 | 843 | |
7deb39ed TP |
844 | if (old_type != PORT_UNKNOWN) { |
845 | retval = uport->ops->request_port(uport); | |
846 | /* | |
847 | * If we failed to restore the old settings, | |
848 | * we fail like this. | |
849 | */ | |
850 | if (retval) | |
851 | uport->type = PORT_UNKNOWN; | |
852 | ||
853 | /* | |
854 | * We failed anyway. | |
855 | */ | |
856 | retval = -EBUSY; | |
857 | } | |
858 | ||
a46c9994 AC |
859 | /* Added to return the correct error -Ram Gupta */ |
860 | goto exit; | |
1da177e4 LT |
861 | } |
862 | } | |
863 | ||
abb4a239 | 864 | if (change_irq) |
7ba2e769 | 865 | uport->irq = new_info->irq; |
46d57a44 | 866 | if (!(uport->flags & UPF_FIXED_PORT)) |
7ba2e769 | 867 | uport->uartclk = new_info->baud_base * 16; |
46d57a44 | 868 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
0077d45e | 869 | (new_flags & UPF_CHANGE_MASK); |
7ba2e769 | 870 | uport->custom_divisor = new_info->custom_divisor; |
46d57a44 AC |
871 | port->close_delay = close_delay; |
872 | port->closing_wait = closing_wait; | |
7ba2e769 AC |
873 | if (new_info->xmit_fifo_size) |
874 | uport->fifosize = new_info->xmit_fifo_size; | |
d6c53c0e | 875 | port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
876 | |
877 | check_and_exit: | |
878 | retval = 0; | |
46d57a44 | 879 | if (uport->type == PORT_UNKNOWN) |
1da177e4 | 880 | goto exit; |
ccce6deb | 881 | if (port->flags & ASYNC_INITIALIZED) { |
46d57a44 AC |
882 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
883 | old_custom_divisor != uport->custom_divisor) { | |
1da177e4 LT |
884 | /* |
885 | * If they're setting up a custom divisor or speed, | |
886 | * instead of clearing it, then bitch about it. No | |
887 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
888 | */ | |
46d57a44 | 889 | if (uport->flags & UPF_SPD_MASK) { |
1da177e4 | 890 | char buf[64]; |
2f2dafe7 SM |
891 | |
892 | dev_notice(uport->dev, | |
893 | "%s sets custom speed on %s. This is deprecated.\n", | |
894 | current->comm, | |
895 | tty_name(port->tty, buf)); | |
1da177e4 | 896 | } |
19225135 | 897 | uart_change_speed(tty, state, NULL); |
1da177e4 LT |
898 | } |
899 | } else | |
19225135 | 900 | retval = uart_startup(tty, state, 1); |
1da177e4 | 901 | exit: |
7ba2e769 AC |
902 | return retval; |
903 | } | |
904 | ||
905 | static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, | |
906 | struct serial_struct __user *newinfo) | |
907 | { | |
908 | struct serial_struct new_serial; | |
909 | struct tty_port *port = &state->port; | |
910 | int retval; | |
911 | ||
912 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
913 | return -EFAULT; | |
914 | ||
915 | /* | |
916 | * This semaphore protects port->count. It is also | |
917 | * very useful to prevent opens. Also, take the | |
918 | * port configuration semaphore to make sure that a | |
919 | * module insertion/removal doesn't change anything | |
920 | * under us. | |
921 | */ | |
922 | mutex_lock(&port->mutex); | |
923 | retval = uart_set_info(tty, port, state, &new_serial); | |
a2bceae0 | 924 | mutex_unlock(&port->mutex); |
1da177e4 LT |
925 | return retval; |
926 | } | |
927 | ||
19225135 AC |
928 | /** |
929 | * uart_get_lsr_info - get line status register info | |
930 | * @tty: tty associated with the UART | |
931 | * @state: UART being queried | |
932 | * @value: returned modem value | |
933 | * | |
934 | * Note: uart_ioctl protects us against hangups. | |
1da177e4 | 935 | */ |
19225135 AC |
936 | static int uart_get_lsr_info(struct tty_struct *tty, |
937 | struct uart_state *state, unsigned int __user *value) | |
1da177e4 | 938 | { |
46d57a44 | 939 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
940 | unsigned int result; |
941 | ||
46d57a44 | 942 | result = uport->ops->tx_empty(uport); |
1da177e4 LT |
943 | |
944 | /* | |
945 | * If we're about to load something into the transmit | |
946 | * register, we'll pretend the transmitter isn't empty to | |
947 | * avoid a race condition (depending on when the transmit | |
948 | * interrupt happens). | |
949 | */ | |
46d57a44 | 950 | if (uport->x_char || |
ebd2c8f6 | 951 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
19225135 | 952 | !tty->stopped && !tty->hw_stopped)) |
1da177e4 | 953 | result &= ~TIOCSER_TEMT; |
a46c9994 | 954 | |
1da177e4 LT |
955 | return put_user(result, value); |
956 | } | |
957 | ||
60b33c13 | 958 | static int uart_tiocmget(struct tty_struct *tty) |
1da177e4 LT |
959 | { |
960 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 961 | struct tty_port *port = &state->port; |
46d57a44 | 962 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
963 | int result = -EIO; |
964 | ||
a2bceae0 | 965 | mutex_lock(&port->mutex); |
60b33c13 | 966 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 967 | result = uport->mctrl; |
46d57a44 AC |
968 | spin_lock_irq(&uport->lock); |
969 | result |= uport->ops->get_mctrl(uport); | |
970 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 971 | } |
a2bceae0 | 972 | mutex_unlock(&port->mutex); |
1da177e4 LT |
973 | |
974 | return result; | |
975 | } | |
976 | ||
977 | static int | |
20b9d177 | 978 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
1da177e4 LT |
979 | { |
980 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 981 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 982 | struct tty_port *port = &state->port; |
1da177e4 LT |
983 | int ret = -EIO; |
984 | ||
a2bceae0 | 985 | mutex_lock(&port->mutex); |
20b9d177 | 986 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 987 | uart_update_mctrl(uport, set, clear); |
1da177e4 LT |
988 | ret = 0; |
989 | } | |
a2bceae0 | 990 | mutex_unlock(&port->mutex); |
1da177e4 LT |
991 | return ret; |
992 | } | |
993 | ||
9e98966c | 994 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
995 | { |
996 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 997 | struct tty_port *port = &state->port; |
46d57a44 | 998 | struct uart_port *uport = state->uart_port; |
1da177e4 | 999 | |
a2bceae0 | 1000 | mutex_lock(&port->mutex); |
1da177e4 | 1001 | |
46d57a44 AC |
1002 | if (uport->type != PORT_UNKNOWN) |
1003 | uport->ops->break_ctl(uport, break_state); | |
1da177e4 | 1004 | |
a2bceae0 | 1005 | mutex_unlock(&port->mutex); |
9e98966c | 1006 | return 0; |
1da177e4 LT |
1007 | } |
1008 | ||
19225135 | 1009 | static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) |
1da177e4 | 1010 | { |
46d57a44 | 1011 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 1012 | struct tty_port *port = &state->port; |
1da177e4 LT |
1013 | int flags, ret; |
1014 | ||
1015 | if (!capable(CAP_SYS_ADMIN)) | |
1016 | return -EPERM; | |
1017 | ||
1018 | /* | |
1019 | * Take the per-port semaphore. This prevents count from | |
1020 | * changing, and hence any extra opens of the port while | |
1021 | * we're auto-configuring. | |
1022 | */ | |
a2bceae0 | 1023 | if (mutex_lock_interruptible(&port->mutex)) |
1da177e4 LT |
1024 | return -ERESTARTSYS; |
1025 | ||
1026 | ret = -EBUSY; | |
b58d13a0 | 1027 | if (tty_port_users(port) == 1) { |
19225135 | 1028 | uart_shutdown(tty, state); |
1da177e4 LT |
1029 | |
1030 | /* | |
1031 | * If we already have a port type configured, | |
1032 | * we must release its resources. | |
1033 | */ | |
46d57a44 AC |
1034 | if (uport->type != PORT_UNKNOWN) |
1035 | uport->ops->release_port(uport); | |
1da177e4 LT |
1036 | |
1037 | flags = UART_CONFIG_TYPE; | |
46d57a44 | 1038 | if (uport->flags & UPF_AUTO_IRQ) |
1da177e4 LT |
1039 | flags |= UART_CONFIG_IRQ; |
1040 | ||
1041 | /* | |
1042 | * This will claim the ports resources if | |
1043 | * a port is found. | |
1044 | */ | |
46d57a44 | 1045 | uport->ops->config_port(uport, flags); |
1da177e4 | 1046 | |
19225135 | 1047 | ret = uart_startup(tty, state, 1); |
1da177e4 | 1048 | } |
a2bceae0 | 1049 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1050 | return ret; |
1051 | } | |
1052 | ||
1fdc3106 AS |
1053 | static void uart_enable_ms(struct uart_port *uport) |
1054 | { | |
1055 | /* | |
1056 | * Force modem status interrupts on | |
1057 | */ | |
1058 | if (uport->ops->enable_ms) | |
1059 | uport->ops->enable_ms(uport); | |
1060 | } | |
1061 | ||
1da177e4 LT |
1062 | /* |
1063 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1064 | * - mask passed in arg for lines of interest | |
1065 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1066 | * Caller should use TIOCGICOUNT to see which one it was | |
bdc04e31 AC |
1067 | * |
1068 | * FIXME: This wants extracting into a common all driver implementation | |
1069 | * of TIOCMWAIT using tty_port. | |
1da177e4 LT |
1070 | */ |
1071 | static int | |
1072 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
1073 | { | |
46d57a44 | 1074 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 1075 | struct tty_port *port = &state->port; |
1da177e4 LT |
1076 | DECLARE_WAITQUEUE(wait, current); |
1077 | struct uart_icount cprev, cnow; | |
1078 | int ret; | |
1079 | ||
1080 | /* | |
1081 | * note the counters on entry | |
1082 | */ | |
46d57a44 AC |
1083 | spin_lock_irq(&uport->lock); |
1084 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); | |
1fdc3106 | 1085 | uart_enable_ms(uport); |
46d57a44 | 1086 | spin_unlock_irq(&uport->lock); |
1da177e4 | 1087 | |
bdc04e31 | 1088 | add_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 | 1089 | for (;;) { |
46d57a44 AC |
1090 | spin_lock_irq(&uport->lock); |
1091 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1092 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1093 | |
1094 | set_current_state(TASK_INTERRUPTIBLE); | |
1095 | ||
1096 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1097 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1098 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1099 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1100 | ret = 0; |
1101 | break; | |
1da177e4 LT |
1102 | } |
1103 | ||
1104 | schedule(); | |
1105 | ||
1106 | /* see if a signal did it */ | |
1107 | if (signal_pending(current)) { | |
1108 | ret = -ERESTARTSYS; | |
1109 | break; | |
1110 | } | |
1111 | ||
1112 | cprev = cnow; | |
1113 | } | |
1114 | ||
1115 | current->state = TASK_RUNNING; | |
bdc04e31 | 1116 | remove_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 LT |
1117 | |
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1123 | * Return: write counters to the user passed counter struct | |
1124 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1125 | * RI where only 0->1 is counted. | |
1126 | */ | |
d281da7f AC |
1127 | static int uart_get_icount(struct tty_struct *tty, |
1128 | struct serial_icounter_struct *icount) | |
1da177e4 | 1129 | { |
d281da7f | 1130 | struct uart_state *state = tty->driver_data; |
1da177e4 | 1131 | struct uart_icount cnow; |
46d57a44 | 1132 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1133 | |
46d57a44 AC |
1134 | spin_lock_irq(&uport->lock); |
1135 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1136 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1137 | |
d281da7f AC |
1138 | icount->cts = cnow.cts; |
1139 | icount->dsr = cnow.dsr; | |
1140 | icount->rng = cnow.rng; | |
1141 | icount->dcd = cnow.dcd; | |
1142 | icount->rx = cnow.rx; | |
1143 | icount->tx = cnow.tx; | |
1144 | icount->frame = cnow.frame; | |
1145 | icount->overrun = cnow.overrun; | |
1146 | icount->parity = cnow.parity; | |
1147 | icount->brk = cnow.brk; | |
1148 | icount->buf_overrun = cnow.buf_overrun; | |
1149 | ||
1150 | return 0; | |
1da177e4 LT |
1151 | } |
1152 | ||
1153 | /* | |
e5238442 | 1154 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1155 | */ |
1156 | static int | |
6caa76b7 | 1157 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, |
1da177e4 LT |
1158 | unsigned long arg) |
1159 | { | |
1160 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1161 | struct tty_port *port = &state->port; |
1da177e4 LT |
1162 | void __user *uarg = (void __user *)arg; |
1163 | int ret = -ENOIOCTLCMD; | |
1164 | ||
1da177e4 LT |
1165 | |
1166 | /* | |
1167 | * These ioctls don't rely on the hardware to be present. | |
1168 | */ | |
1169 | switch (cmd) { | |
1170 | case TIOCGSERIAL: | |
9f109694 | 1171 | ret = uart_get_info_user(port, uarg); |
1da177e4 LT |
1172 | break; |
1173 | ||
1174 | case TIOCSSERIAL: | |
7ba2e769 | 1175 | ret = uart_set_info_user(tty, state, uarg); |
1da177e4 LT |
1176 | break; |
1177 | ||
1178 | case TIOCSERCONFIG: | |
19225135 | 1179 | ret = uart_do_autoconfig(tty, state); |
1da177e4 LT |
1180 | break; |
1181 | ||
1182 | case TIOCSERGWILD: /* obsolete */ | |
1183 | case TIOCSERSWILD: /* obsolete */ | |
1184 | ret = 0; | |
1185 | break; | |
1186 | } | |
1187 | ||
1188 | if (ret != -ENOIOCTLCMD) | |
1189 | goto out; | |
1190 | ||
1191 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1192 | ret = -EIO; | |
1193 | goto out; | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * The following should only be used when hardware is present. | |
1198 | */ | |
1199 | switch (cmd) { | |
1200 | case TIOCMIWAIT: | |
1201 | ret = uart_wait_modem_status(state, arg); | |
1202 | break; | |
1da177e4 LT |
1203 | } |
1204 | ||
1205 | if (ret != -ENOIOCTLCMD) | |
1206 | goto out; | |
1207 | ||
a2bceae0 | 1208 | mutex_lock(&port->mutex); |
1da177e4 | 1209 | |
6caa76b7 | 1210 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
1da177e4 LT |
1211 | ret = -EIO; |
1212 | goto out_up; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * All these rely on hardware being present and need to be | |
1217 | * protected against the tty being hung up. | |
1218 | */ | |
1219 | switch (cmd) { | |
1220 | case TIOCSERGETLSR: /* Get line status register */ | |
19225135 | 1221 | ret = uart_get_lsr_info(tty, state, uarg); |
1da177e4 LT |
1222 | break; |
1223 | ||
1224 | default: { | |
46d57a44 AC |
1225 | struct uart_port *uport = state->uart_port; |
1226 | if (uport->ops->ioctl) | |
1227 | ret = uport->ops->ioctl(uport, cmd, arg); | |
1da177e4 LT |
1228 | break; |
1229 | } | |
1230 | } | |
f34d7a5b | 1231 | out_up: |
a2bceae0 | 1232 | mutex_unlock(&port->mutex); |
f34d7a5b | 1233 | out: |
1da177e4 LT |
1234 | return ret; |
1235 | } | |
1236 | ||
edeb280e | 1237 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1238 | { |
1239 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1240 | struct uart_port *uport = state->uart_port; |
64e9159f | 1241 | |
46d57a44 | 1242 | if (uport->ops->set_ldisc) |
adc8d746 | 1243 | uport->ops->set_ldisc(uport, tty->termios.c_line); |
64e9159f AC |
1244 | } |
1245 | ||
a46c9994 AC |
1246 | static void uart_set_termios(struct tty_struct *tty, |
1247 | struct ktermios *old_termios) | |
1da177e4 LT |
1248 | { |
1249 | struct uart_state *state = tty->driver_data; | |
dec94e70 | 1250 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1251 | unsigned long flags; |
adc8d746 | 1252 | unsigned int cflag = tty->termios.c_cflag; |
2cbacafd RK |
1253 | unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; |
1254 | bool sw_changed = false; | |
1da177e4 | 1255 | |
2cbacafd RK |
1256 | /* |
1257 | * Drivers doing software flow control also need to know | |
1258 | * about changes to these input settings. | |
1259 | */ | |
1260 | if (uport->flags & UPF_SOFT_FLOW) { | |
1261 | iflag_mask |= IXANY|IXON|IXOFF; | |
1262 | sw_changed = | |
1263 | tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || | |
1264 | tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; | |
1265 | } | |
1da177e4 LT |
1266 | |
1267 | /* | |
1268 | * These are the bits that are used to setup various | |
20620d68 DW |
1269 | * flags in the low level driver. We can ignore the Bfoo |
1270 | * bits in c_cflag; c_[io]speed will always be set | |
1271 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 | 1272 | */ |
1da177e4 | 1273 | if ((cflag ^ old_termios->c_cflag) == 0 && |
adc8d746 AC |
1274 | tty->termios.c_ospeed == old_termios->c_ospeed && |
1275 | tty->termios.c_ispeed == old_termios->c_ispeed && | |
2cbacafd RK |
1276 | ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && |
1277 | !sw_changed) { | |
1da177e4 | 1278 | return; |
e5238442 | 1279 | } |
1da177e4 | 1280 | |
19225135 | 1281 | uart_change_speed(tty, state, old_termios); |
c18b55fd PH |
1282 | /* reload cflag from termios; port driver may have overriden flags */ |
1283 | cflag = tty->termios.c_cflag; | |
1da177e4 LT |
1284 | |
1285 | /* Handle transition to B0 status */ | |
1286 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
dec94e70 | 1287 | uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 1288 | /* Handle transition away from B0 status */ |
82cb7ba1 | 1289 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 | 1290 | unsigned int mask = TIOCM_DTR; |
99abf3b9 | 1291 | if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) |
1da177e4 | 1292 | mask |= TIOCM_RTS; |
dec94e70 | 1293 | uart_set_mctrl(uport, mask); |
1da177e4 LT |
1294 | } |
1295 | ||
dba05832 RK |
1296 | /* |
1297 | * If the port is doing h/w assisted flow control, do nothing. | |
1298 | * We assume that tty->hw_stopped has never been set. | |
1299 | */ | |
1300 | if (uport->flags & UPF_HARD_FLOW) | |
1301 | return; | |
1302 | ||
1da177e4 LT |
1303 | /* Handle turning off CRTSCTS */ |
1304 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
dec94e70 | 1305 | spin_lock_irqsave(&uport->lock, flags); |
1da177e4 LT |
1306 | tty->hw_stopped = 0; |
1307 | __uart_start(tty); | |
dec94e70 | 1308 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 | 1309 | } |
0dd7a1ae | 1310 | /* Handle turning on CRTSCTS */ |
82cb7ba1 | 1311 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
dec94e70 RK |
1312 | spin_lock_irqsave(&uport->lock, flags); |
1313 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { | |
0dd7a1ae | 1314 | tty->hw_stopped = 1; |
dec94e70 | 1315 | uport->ops->stop_tx(uport); |
0dd7a1ae | 1316 | } |
dec94e70 | 1317 | spin_unlock_irqrestore(&uport->lock, flags); |
0dd7a1ae | 1318 | } |
1da177e4 LT |
1319 | } |
1320 | ||
1321 | /* | |
ef4f527c KC |
1322 | * Calls to uart_close() are serialised via the tty_lock in |
1323 | * drivers/tty/tty_io.c:tty_release() | |
1324 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1325 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1326 | */ |
1327 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1328 | { | |
1329 | struct uart_state *state = tty->driver_data; | |
46d57a44 AC |
1330 | struct tty_port *port; |
1331 | struct uart_port *uport; | |
61cd8a21 | 1332 | unsigned long flags; |
a46c9994 | 1333 | |
eea7e17e LT |
1334 | if (!state) |
1335 | return; | |
1336 | ||
46d57a44 AC |
1337 | uport = state->uart_port; |
1338 | port = &state->port; | |
1da177e4 | 1339 | |
4ed94cd4 | 1340 | pr_debug("uart_close(%d) called\n", uport ? uport->line : -1); |
1da177e4 | 1341 | |
4ed94cd4 | 1342 | if (!port->count || tty_port_close_start(port, tty, filp) == 0) |
55956216 | 1343 | return; |
1da177e4 LT |
1344 | |
1345 | /* | |
1346 | * At this point, we stop accepting input. To do this, we | |
1347 | * disable the receive line status interrupts. | |
1348 | */ | |
ccce6deb | 1349 | if (port->flags & ASYNC_INITIALIZED) { |
1da177e4 | 1350 | unsigned long flags; |
eea7e17e | 1351 | spin_lock_irqsave(&uport->lock, flags); |
46d57a44 | 1352 | uport->ops->stop_rx(uport); |
eea7e17e | 1353 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 LT |
1354 | /* |
1355 | * Before we drop DTR, make sure the UART transmitter | |
1356 | * has completely drained; this is especially | |
1357 | * important if there is a transmit FIFO! | |
1358 | */ | |
1f33a51d | 1359 | uart_wait_until_sent(tty, uport->timeout); |
1da177e4 LT |
1360 | } |
1361 | ||
bafb0bd2 | 1362 | mutex_lock(&port->mutex); |
19225135 | 1363 | uart_shutdown(tty, state); |
1da177e4 LT |
1364 | uart_flush_buffer(tty); |
1365 | ||
a46c9994 AC |
1366 | tty_ldisc_flush(tty); |
1367 | ||
7b01478f | 1368 | tty_port_tty_set(port, NULL); |
61cd8a21 | 1369 | tty->closing = 0; |
ddc7b758 | 1370 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 1371 | |
46d57a44 | 1372 | if (port->blocked_open) { |
61cd8a21 | 1373 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1374 | if (port->close_delay) |
4cb0fbfd JS |
1375 | msleep_interruptible( |
1376 | jiffies_to_msecs(port->close_delay)); | |
61cd8a21 | 1377 | spin_lock_irqsave(&port->lock, flags); |
46d57a44 | 1378 | } else if (!uart_console(uport)) { |
61cd8a21 | 1379 | spin_unlock_irqrestore(&port->lock, flags); |
6f538fe3 | 1380 | uart_change_pm(state, UART_PM_STATE_OFF); |
61cd8a21 | 1381 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1382 | } |
1383 | ||
1384 | /* | |
1385 | * Wake up anyone trying to open this port. | |
1386 | */ | |
ccce6deb | 1387 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
426929f8 | 1388 | clear_bit(ASYNCB_CLOSING, &port->flags); |
61cd8a21 | 1389 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1390 | wake_up_interruptible(&port->open_wait); |
426929f8 | 1391 | wake_up_interruptible(&port->close_wait); |
1da177e4 | 1392 | |
a2bceae0 | 1393 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1394 | } |
1395 | ||
1f33a51d | 1396 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
1da177e4 | 1397 | { |
1f33a51d JS |
1398 | struct uart_state *state = tty->driver_data; |
1399 | struct uart_port *port = state->uart_port; | |
1da177e4 LT |
1400 | unsigned long char_time, expire; |
1401 | ||
1da177e4 LT |
1402 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1403 | return; | |
1404 | ||
1405 | /* | |
1406 | * Set the check interval to be 1/5 of the estimated time to | |
1407 | * send a single character, and make it at least 1. The check | |
1408 | * interval should also be less than the timeout. | |
1409 | * | |
1410 | * Note: we have to use pretty tight timings here to satisfy | |
1411 | * the NIST-PCTS. | |
1412 | */ | |
1413 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1414 | char_time = char_time / 5; | |
1415 | if (char_time == 0) | |
1416 | char_time = 1; | |
1417 | if (timeout && timeout < char_time) | |
1418 | char_time = timeout; | |
1419 | ||
1420 | /* | |
1421 | * If the transmitter hasn't cleared in twice the approximate | |
1422 | * amount of time to send the entire FIFO, it probably won't | |
1423 | * ever clear. This assumes the UART isn't doing flow | |
1424 | * control, which is currently the case. Hence, if it ever | |
1425 | * takes longer than port->timeout, this is probably due to a | |
1426 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1427 | * 2*port->timeout. | |
1428 | */ | |
1429 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1430 | timeout = 2 * port->timeout; | |
1431 | ||
1432 | expire = jiffies + timeout; | |
1433 | ||
eb3a1e11 | 1434 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1435 | port->line, jiffies, expire); |
1da177e4 LT |
1436 | |
1437 | /* | |
1438 | * Check whether the transmitter is empty every 'char_time'. | |
1439 | * 'timeout' / 'expire' give us the maximum amount of time | |
1440 | * we wait. | |
1441 | */ | |
1442 | while (!port->ops->tx_empty(port)) { | |
1443 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1444 | if (signal_pending(current)) | |
1445 | break; | |
1446 | if (time_after(jiffies, expire)) | |
1447 | break; | |
1448 | } | |
20365219 AB |
1449 | } |
1450 | ||
1da177e4 | 1451 | /* |
ef4f527c KC |
1452 | * Calls to uart_hangup() are serialised by the tty_lock in |
1453 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1454 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1455 | */ |
1456 | static void uart_hangup(struct tty_struct *tty) | |
1457 | { | |
1458 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1459 | struct tty_port *port = &state->port; |
61cd8a21 | 1460 | unsigned long flags; |
1da177e4 | 1461 | |
ebd2c8f6 | 1462 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
1da177e4 | 1463 | |
a2bceae0 | 1464 | mutex_lock(&port->mutex); |
ccce6deb | 1465 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
1da177e4 | 1466 | uart_flush_buffer(tty); |
19225135 | 1467 | uart_shutdown(tty, state); |
61cd8a21 | 1468 | spin_lock_irqsave(&port->lock, flags); |
91312cdb | 1469 | port->count = 0; |
ccce6deb | 1470 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
61cd8a21 | 1471 | spin_unlock_irqrestore(&port->lock, flags); |
7b01478f | 1472 | tty_port_tty_set(port, NULL); |
bf903c0c GU |
1473 | if (!uart_console(state->uart_port)) |
1474 | uart_change_pm(state, UART_PM_STATE_OFF); | |
46d57a44 | 1475 | wake_up_interruptible(&port->open_wait); |
bdc04e31 | 1476 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 | 1477 | } |
a2bceae0 | 1478 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1479 | } |
1480 | ||
0b1db830 JS |
1481 | static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) |
1482 | { | |
1483 | return 0; | |
1484 | } | |
1485 | ||
1486 | static void uart_port_shutdown(struct tty_port *port) | |
1487 | { | |
b922e19d JS |
1488 | struct uart_state *state = container_of(port, struct uart_state, port); |
1489 | struct uart_port *uport = state->uart_port; | |
1490 | ||
1491 | /* | |
1492 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
1493 | * the irq here so the queue might never be woken up. Note | |
1494 | * that we won't end up waiting on delta_msr_wait again since | |
1495 | * any outstanding file descriptors should be pointing at | |
1496 | * hung_up_tty_fops now. | |
1497 | */ | |
1498 | wake_up_interruptible(&port->delta_msr_wait); | |
1499 | ||
1500 | /* | |
1501 | * Free the IRQ and disable the port. | |
1502 | */ | |
1503 | uport->ops->shutdown(uport); | |
1504 | ||
1505 | /* | |
1506 | * Ensure that the IRQ handler isn't running on another CPU. | |
1507 | */ | |
1508 | synchronize_irq(uport->irq); | |
0b1db830 JS |
1509 | } |
1510 | ||
de0c8cb3 AC |
1511 | static int uart_carrier_raised(struct tty_port *port) |
1512 | { | |
1513 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1514 | struct uart_port *uport = state->uart_port; | |
1515 | int mctrl; | |
de0c8cb3 | 1516 | spin_lock_irq(&uport->lock); |
1fdc3106 | 1517 | uart_enable_ms(uport); |
de0c8cb3 AC |
1518 | mctrl = uport->ops->get_mctrl(uport); |
1519 | spin_unlock_irq(&uport->lock); | |
de0c8cb3 AC |
1520 | if (mctrl & TIOCM_CAR) |
1521 | return 1; | |
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static void uart_dtr_rts(struct tty_port *port, int onoff) | |
1526 | { | |
1527 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1528 | struct uart_port *uport = state->uart_port; | |
24fcc7c8 | 1529 | |
6f5c24ad | 1530 | if (onoff) |
de0c8cb3 AC |
1531 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
1532 | else | |
1533 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); | |
de0c8cb3 AC |
1534 | } |
1535 | ||
1da177e4 | 1536 | /* |
ef4f527c KC |
1537 | * Calls to uart_open are serialised by the tty_lock in |
1538 | * drivers/tty/tty_io.c:tty_open() | |
1da177e4 LT |
1539 | * Note that if this fails, then uart_close() _will_ be called. |
1540 | * | |
1541 | * In time, we want to scrap the "opening nonpresent ports" | |
1542 | * behaviour and implement an alternative way for setserial | |
1543 | * to set base addresses/ports/types. This will allow us to | |
1544 | * get rid of a certain amount of extra tests. | |
1545 | */ | |
1546 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1547 | { | |
1548 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1da177e4 | 1549 | int retval, line = tty->index; |
1c7b13c4 JS |
1550 | struct uart_state *state = drv->state + line; |
1551 | struct tty_port *port = &state->port; | |
1da177e4 | 1552 | |
eb3a1e11 | 1553 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 | 1554 | |
1da177e4 | 1555 | /* |
1c7b13c4 JS |
1556 | * We take the semaphore here to guarantee that we won't be re-entered |
1557 | * while allocating the state structure, or while we request any IRQs | |
1558 | * that the driver may need. This also has the nice side-effect that | |
1559 | * it delays the action of uart_hangup, so we can guarantee that | |
1560 | * state->port.tty will always contain something reasonable. | |
1da177e4 | 1561 | */ |
1c7b13c4 JS |
1562 | if (mutex_lock_interruptible(&port->mutex)) { |
1563 | retval = -ERESTARTSYS; | |
1564 | goto end; | |
1565 | } | |
1566 | ||
1567 | port->count++; | |
1568 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { | |
1569 | retval = -ENXIO; | |
1570 | goto err_dec_count; | |
1da177e4 LT |
1571 | } |
1572 | ||
1573 | /* | |
1574 | * Once we set tty->driver_data here, we are guaranteed that | |
1575 | * uart_close() will decrement the driver module use count. | |
1576 | * Any failures from here onwards should not touch the count. | |
1577 | */ | |
1578 | tty->driver_data = state; | |
ebd2c8f6 | 1579 | state->uart_port->state = state; |
d6c53c0e JS |
1580 | state->port.low_latency = |
1581 | (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
7b01478f | 1582 | tty_port_tty_set(port, tty); |
1da177e4 | 1583 | |
1da177e4 LT |
1584 | /* |
1585 | * Start up the serial port. | |
1586 | */ | |
19225135 | 1587 | retval = uart_startup(tty, state, 0); |
1da177e4 LT |
1588 | |
1589 | /* | |
1590 | * If we succeeded, wait until the port is ready. | |
1591 | */ | |
61cd8a21 | 1592 | mutex_unlock(&port->mutex); |
1da177e4 | 1593 | if (retval == 0) |
74c21077 | 1594 | retval = tty_port_block_til_ready(port, tty, filp); |
1da177e4 | 1595 | |
1c7b13c4 | 1596 | end: |
1da177e4 | 1597 | return retval; |
1c7b13c4 JS |
1598 | err_dec_count: |
1599 | port->count--; | |
1600 | mutex_unlock(&port->mutex); | |
1601 | goto end; | |
1da177e4 LT |
1602 | } |
1603 | ||
1604 | static const char *uart_type(struct uart_port *port) | |
1605 | { | |
1606 | const char *str = NULL; | |
1607 | ||
1608 | if (port->ops->type) | |
1609 | str = port->ops->type(port); | |
1610 | ||
1611 | if (!str) | |
1612 | str = "unknown"; | |
1613 | ||
1614 | return str; | |
1615 | } | |
1616 | ||
1617 | #ifdef CONFIG_PROC_FS | |
1618 | ||
d196a949 | 1619 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1da177e4 LT |
1620 | { |
1621 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 1622 | struct tty_port *port = &state->port; |
6f538fe3 | 1623 | enum uart_pm_state pm_state; |
a2bceae0 | 1624 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
1625 | char stat_buf[32]; |
1626 | unsigned int status; | |
d196a949 | 1627 | int mmio; |
1da177e4 | 1628 | |
a2bceae0 | 1629 | if (!uport) |
d196a949 | 1630 | return; |
1da177e4 | 1631 | |
a2bceae0 | 1632 | mmio = uport->iotype >= UPIO_MEM; |
d196a949 | 1633 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
a2bceae0 | 1634 | uport->line, uart_type(uport), |
6c6a2334 | 1635 | mmio ? "mmio:0x" : "port:", |
a2bceae0 AC |
1636 | mmio ? (unsigned long long)uport->mapbase |
1637 | : (unsigned long long)uport->iobase, | |
1638 | uport->irq); | |
1da177e4 | 1639 | |
a2bceae0 | 1640 | if (uport->type == PORT_UNKNOWN) { |
d196a949 AD |
1641 | seq_putc(m, '\n'); |
1642 | return; | |
1da177e4 LT |
1643 | } |
1644 | ||
a46c9994 | 1645 | if (capable(CAP_SYS_ADMIN)) { |
a2bceae0 | 1646 | mutex_lock(&port->mutex); |
3689a0ec | 1647 | pm_state = state->pm_state; |
6f538fe3 LW |
1648 | if (pm_state != UART_PM_STATE_ON) |
1649 | uart_change_pm(state, UART_PM_STATE_ON); | |
a2bceae0 AC |
1650 | spin_lock_irq(&uport->lock); |
1651 | status = uport->ops->get_mctrl(uport); | |
1652 | spin_unlock_irq(&uport->lock); | |
6f538fe3 | 1653 | if (pm_state != UART_PM_STATE_ON) |
3689a0ec | 1654 | uart_change_pm(state, pm_state); |
a2bceae0 | 1655 | mutex_unlock(&port->mutex); |
1da177e4 | 1656 | |
d196a949 | 1657 | seq_printf(m, " tx:%d rx:%d", |
a2bceae0 AC |
1658 | uport->icount.tx, uport->icount.rx); |
1659 | if (uport->icount.frame) | |
d196a949 | 1660 | seq_printf(m, " fe:%d", |
a2bceae0 AC |
1661 | uport->icount.frame); |
1662 | if (uport->icount.parity) | |
d196a949 | 1663 | seq_printf(m, " pe:%d", |
a2bceae0 AC |
1664 | uport->icount.parity); |
1665 | if (uport->icount.brk) | |
d196a949 | 1666 | seq_printf(m, " brk:%d", |
a2bceae0 AC |
1667 | uport->icount.brk); |
1668 | if (uport->icount.overrun) | |
d196a949 | 1669 | seq_printf(m, " oe:%d", |
a2bceae0 | 1670 | uport->icount.overrun); |
a46c9994 AC |
1671 | |
1672 | #define INFOBIT(bit, str) \ | |
a2bceae0 | 1673 | if (uport->mctrl & (bit)) \ |
1da177e4 LT |
1674 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1675 | strlen(stat_buf) - 2) | |
a46c9994 | 1676 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1677 | if (status & (bit)) \ |
1678 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1679 | strlen(stat_buf) - 2) | |
1680 | ||
1681 | stat_buf[0] = '\0'; | |
1682 | stat_buf[1] = '\0'; | |
1683 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1684 | STATBIT(TIOCM_CTS, "|CTS"); | |
1685 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1686 | STATBIT(TIOCM_DSR, "|DSR"); | |
1687 | STATBIT(TIOCM_CAR, "|CD"); | |
1688 | STATBIT(TIOCM_RNG, "|RI"); | |
1689 | if (stat_buf[0]) | |
1690 | stat_buf[0] = ' '; | |
a46c9994 | 1691 | |
d196a949 | 1692 | seq_puts(m, stat_buf); |
1da177e4 | 1693 | } |
d196a949 | 1694 | seq_putc(m, '\n'); |
1da177e4 LT |
1695 | #undef STATBIT |
1696 | #undef INFOBIT | |
1da177e4 LT |
1697 | } |
1698 | ||
d196a949 | 1699 | static int uart_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1700 | { |
833bb304 | 1701 | struct tty_driver *ttydrv = m->private; |
1da177e4 | 1702 | struct uart_driver *drv = ttydrv->driver_state; |
d196a949 | 1703 | int i; |
1da177e4 | 1704 | |
d196a949 | 1705 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
1da177e4 | 1706 | "", "", ""); |
d196a949 AD |
1707 | for (i = 0; i < drv->nr; i++) |
1708 | uart_line_info(m, drv, i); | |
1709 | return 0; | |
1da177e4 | 1710 | } |
d196a949 AD |
1711 | |
1712 | static int uart_proc_open(struct inode *inode, struct file *file) | |
1713 | { | |
d9dda78b | 1714 | return single_open(file, uart_proc_show, PDE_DATA(inode)); |
d196a949 AD |
1715 | } |
1716 | ||
1717 | static const struct file_operations uart_proc_fops = { | |
1718 | .owner = THIS_MODULE, | |
1719 | .open = uart_proc_open, | |
1720 | .read = seq_read, | |
1721 | .llseek = seq_lseek, | |
1722 | .release = single_release, | |
1723 | }; | |
1da177e4 LT |
1724 | #endif |
1725 | ||
4a1b5502 | 1726 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1727 | /* |
1728 | * uart_console_write - write a console message to a serial port | |
1729 | * @port: the port to write the message | |
1730 | * @s: array of characters | |
1731 | * @count: number of characters in string to write | |
1732 | * @write: function to write character to port | |
1733 | */ | |
1734 | void uart_console_write(struct uart_port *port, const char *s, | |
1735 | unsigned int count, | |
1736 | void (*putchar)(struct uart_port *, int)) | |
1737 | { | |
1738 | unsigned int i; | |
1739 | ||
1740 | for (i = 0; i < count; i++, s++) { | |
1741 | if (*s == '\n') | |
1742 | putchar(port, '\r'); | |
1743 | putchar(port, *s); | |
1744 | } | |
1745 | } | |
1746 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1747 | ||
1da177e4 LT |
1748 | /* |
1749 | * Check whether an invalid uart number has been specified, and | |
1750 | * if so, search for the first available port that does have | |
1751 | * console support. | |
1752 | */ | |
1753 | struct uart_port * __init | |
1754 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1755 | { | |
1756 | int idx = co->index; | |
1757 | ||
1758 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1759 | ports[idx].membase == NULL)) | |
1760 | for (idx = 0; idx < nr; idx++) | |
1761 | if (ports[idx].iobase != 0 || | |
1762 | ports[idx].membase != NULL) | |
1763 | break; | |
1764 | ||
1765 | co->index = idx; | |
1766 | ||
1767 | return ports + idx; | |
1768 | } | |
1769 | ||
1770 | /** | |
02088ca6 | 1771 | * uart_parse_options - Parse serial port baud/parity/bits/flow control. |
1da177e4 LT |
1772 | * @options: pointer to option string |
1773 | * @baud: pointer to an 'int' variable for the baud rate. | |
1774 | * @parity: pointer to an 'int' variable for the parity. | |
1775 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1776 | * @flow: pointer to an 'int' variable for the flow control character. | |
1777 | * | |
1778 | * uart_parse_options decodes a string containing the serial console | |
1779 | * options. The format of the string is <baud><parity><bits><flow>, | |
1780 | * eg: 115200n8r | |
1781 | */ | |
f2d937f3 | 1782 | void |
1da177e4 LT |
1783 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1784 | { | |
1785 | char *s = options; | |
1786 | ||
1787 | *baud = simple_strtoul(s, NULL, 10); | |
1788 | while (*s >= '0' && *s <= '9') | |
1789 | s++; | |
1790 | if (*s) | |
1791 | *parity = *s++; | |
1792 | if (*s) | |
1793 | *bits = *s++ - '0'; | |
1794 | if (*s) | |
1795 | *flow = *s; | |
1796 | } | |
f2d937f3 | 1797 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1798 | |
1799 | struct baud_rates { | |
1800 | unsigned int rate; | |
1801 | unsigned int cflag; | |
1802 | }; | |
1803 | ||
cb3592be | 1804 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1805 | { 921600, B921600 }, |
1806 | { 460800, B460800 }, | |
1807 | { 230400, B230400 }, | |
1808 | { 115200, B115200 }, | |
1809 | { 57600, B57600 }, | |
1810 | { 38400, B38400 }, | |
1811 | { 19200, B19200 }, | |
1812 | { 9600, B9600 }, | |
1813 | { 4800, B4800 }, | |
1814 | { 2400, B2400 }, | |
1815 | { 1200, B1200 }, | |
1816 | { 0, B38400 } | |
1817 | }; | |
1818 | ||
1819 | /** | |
1820 | * uart_set_options - setup the serial console parameters | |
1821 | * @port: pointer to the serial ports uart_port structure | |
1822 | * @co: console pointer | |
1823 | * @baud: baud rate | |
1824 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1825 | * @bits: number of data bits | |
1826 | * @flow: flow control character - 'r' (rts) | |
1827 | */ | |
f2d937f3 | 1828 | int |
1da177e4 LT |
1829 | uart_set_options(struct uart_port *port, struct console *co, |
1830 | int baud, int parity, int bits, int flow) | |
1831 | { | |
606d099c | 1832 | struct ktermios termios; |
149b36ea | 1833 | static struct ktermios dummy; |
1da177e4 LT |
1834 | int i; |
1835 | ||
976ecd12 RK |
1836 | /* |
1837 | * Ensure that the serial console lock is initialised | |
1838 | * early. | |
42b6a1ba RW |
1839 | * If this port is a console, then the spinlock is already |
1840 | * initialised. | |
976ecd12 | 1841 | */ |
42b6a1ba RW |
1842 | if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { |
1843 | spin_lock_init(&port->lock); | |
1844 | lockdep_set_class(&port->lock, &port_lock_key); | |
1845 | } | |
976ecd12 | 1846 | |
606d099c | 1847 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1848 | |
1849 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1850 | ||
1851 | /* | |
1852 | * Construct a cflag setting. | |
1853 | */ | |
1854 | for (i = 0; baud_rates[i].rate; i++) | |
1855 | if (baud_rates[i].rate <= baud) | |
1856 | break; | |
1857 | ||
1858 | termios.c_cflag |= baud_rates[i].cflag; | |
1859 | ||
1860 | if (bits == 7) | |
1861 | termios.c_cflag |= CS7; | |
1862 | else | |
1863 | termios.c_cflag |= CS8; | |
1864 | ||
1865 | switch (parity) { | |
1866 | case 'o': case 'O': | |
1867 | termios.c_cflag |= PARODD; | |
1868 | /*fall through*/ | |
1869 | case 'e': case 'E': | |
1870 | termios.c_cflag |= PARENB; | |
1871 | break; | |
1872 | } | |
1873 | ||
1874 | if (flow == 'r') | |
1875 | termios.c_cflag |= CRTSCTS; | |
1876 | ||
79492689 YL |
1877 | /* |
1878 | * some uarts on other side don't support no flow control. | |
1879 | * So we set * DTR in host uart to make them happy | |
1880 | */ | |
1881 | port->mctrl |= TIOCM_DTR; | |
1882 | ||
149b36ea | 1883 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1884 | /* |
1885 | * Allow the setting of the UART parameters with a NULL console | |
1886 | * too: | |
1887 | */ | |
1888 | if (co) | |
1889 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1890 | |
1891 | return 0; | |
1892 | } | |
f2d937f3 | 1893 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1894 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1895 | ||
cf75525f JS |
1896 | /** |
1897 | * uart_change_pm - set power state of the port | |
1898 | * | |
1899 | * @state: port descriptor | |
1900 | * @pm_state: new state | |
1901 | * | |
1902 | * Locking: port->mutex has to be held | |
1903 | */ | |
6f538fe3 LW |
1904 | static void uart_change_pm(struct uart_state *state, |
1905 | enum uart_pm_state pm_state) | |
1da177e4 | 1906 | { |
ebd2c8f6 | 1907 | struct uart_port *port = state->uart_port; |
1281e360 AV |
1908 | |
1909 | if (state->pm_state != pm_state) { | |
1910 | if (port->ops->pm) | |
1911 | port->ops->pm(port, pm_state, state->pm_state); | |
1912 | state->pm_state = pm_state; | |
1913 | } | |
1da177e4 LT |
1914 | } |
1915 | ||
b3b708fa GL |
1916 | struct uart_match { |
1917 | struct uart_port *port; | |
1918 | struct uart_driver *driver; | |
1919 | }; | |
1920 | ||
1921 | static int serial_match_port(struct device *dev, void *data) | |
1922 | { | |
1923 | struct uart_match *match = data; | |
7ca796f4 GL |
1924 | struct tty_driver *tty_drv = match->driver->tty_driver; |
1925 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
1926 | match->port->line; | |
b3b708fa GL |
1927 | |
1928 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1929 | } | |
1930 | ||
ccce6deb | 1931 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1932 | { |
ccce6deb AC |
1933 | struct uart_state *state = drv->state + uport->line; |
1934 | struct tty_port *port = &state->port; | |
b3b708fa | 1935 | struct device *tty_dev; |
ccce6deb | 1936 | struct uart_match match = {uport, drv}; |
1da177e4 | 1937 | |
a2bceae0 | 1938 | mutex_lock(&port->mutex); |
1da177e4 | 1939 | |
ccce6deb | 1940 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
b3b708fa | 1941 | if (device_may_wakeup(tty_dev)) { |
3f960dbb G |
1942 | if (!enable_irq_wake(uport->irq)) |
1943 | uport->irq_wake = 1; | |
b3b708fa | 1944 | put_device(tty_dev); |
a2bceae0 | 1945 | mutex_unlock(&port->mutex); |
b3b708fa GL |
1946 | return 0; |
1947 | } | |
5a65dcc0 FV |
1948 | put_device(tty_dev); |
1949 | ||
4547be78 SB |
1950 | if (console_suspend_enabled || !uart_console(uport)) |
1951 | uport->suspended = 1; | |
b3b708fa | 1952 | |
ccce6deb AC |
1953 | if (port->flags & ASYNC_INITIALIZED) { |
1954 | const struct uart_ops *ops = uport->ops; | |
c8c6bfa3 | 1955 | int tries; |
1da177e4 | 1956 | |
4547be78 SB |
1957 | if (console_suspend_enabled || !uart_console(uport)) { |
1958 | set_bit(ASYNCB_SUSPENDED, &port->flags); | |
1959 | clear_bit(ASYNCB_INITIALIZED, &port->flags); | |
a6b93a90 | 1960 | |
4547be78 SB |
1961 | spin_lock_irq(&uport->lock); |
1962 | ops->stop_tx(uport); | |
1963 | ops->set_mctrl(uport, 0); | |
1964 | ops->stop_rx(uport); | |
1965 | spin_unlock_irq(&uport->lock); | |
1966 | } | |
1da177e4 LT |
1967 | |
1968 | /* | |
1969 | * Wait for the transmitter to empty. | |
1970 | */ | |
ccce6deb | 1971 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
1da177e4 | 1972 | msleep(10); |
c8c6bfa3 | 1973 | if (!tries) |
2f2dafe7 SM |
1974 | dev_err(uport->dev, "%s%d: Unable to drain transmitter\n", |
1975 | drv->dev_name, | |
1976 | drv->tty_driver->name_base + uport->line); | |
1da177e4 | 1977 | |
4547be78 SB |
1978 | if (console_suspend_enabled || !uart_console(uport)) |
1979 | ops->shutdown(uport); | |
1da177e4 LT |
1980 | } |
1981 | ||
1982 | /* | |
1983 | * Disable the console device before suspending. | |
1984 | */ | |
4547be78 | 1985 | if (console_suspend_enabled && uart_console(uport)) |
ccce6deb | 1986 | console_stop(uport->cons); |
1da177e4 | 1987 | |
4547be78 | 1988 | if (console_suspend_enabled || !uart_console(uport)) |
6f538fe3 | 1989 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 | 1990 | |
a2bceae0 | 1991 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1992 | |
1993 | return 0; | |
1994 | } | |
1995 | ||
ccce6deb | 1996 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1997 | { |
ccce6deb AC |
1998 | struct uart_state *state = drv->state + uport->line; |
1999 | struct tty_port *port = &state->port; | |
03a74dcc | 2000 | struct device *tty_dev; |
ccce6deb | 2001 | struct uart_match match = {uport, drv}; |
ba15ab0e | 2002 | struct ktermios termios; |
1da177e4 | 2003 | |
a2bceae0 | 2004 | mutex_lock(&port->mutex); |
1da177e4 | 2005 | |
ccce6deb AC |
2006 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
2007 | if (!uport->suspended && device_may_wakeup(tty_dev)) { | |
3f960dbb G |
2008 | if (uport->irq_wake) { |
2009 | disable_irq_wake(uport->irq); | |
2010 | uport->irq_wake = 0; | |
2011 | } | |
5a65dcc0 | 2012 | put_device(tty_dev); |
a2bceae0 | 2013 | mutex_unlock(&port->mutex); |
b3b708fa GL |
2014 | return 0; |
2015 | } | |
5a65dcc0 | 2016 | put_device(tty_dev); |
ccce6deb | 2017 | uport->suspended = 0; |
b3b708fa | 2018 | |
1da177e4 LT |
2019 | /* |
2020 | * Re-enable the console device after suspending. | |
2021 | */ | |
5933a161 | 2022 | if (uart_console(uport)) { |
891b9dd1 JW |
2023 | /* |
2024 | * First try to use the console cflag setting. | |
2025 | */ | |
2026 | memset(&termios, 0, sizeof(struct ktermios)); | |
2027 | termios.c_cflag = uport->cons->cflag; | |
2028 | ||
2029 | /* | |
2030 | * If that's unset, use the tty termios setting. | |
2031 | */ | |
adc8d746 AC |
2032 | if (port->tty && termios.c_cflag == 0) |
2033 | termios = port->tty->termios; | |
891b9dd1 | 2034 | |
94abc56f | 2035 | if (console_suspend_enabled) |
6f538fe3 | 2036 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb | 2037 | uport->ops->set_termios(uport, &termios, NULL); |
5933a161 YK |
2038 | if (console_suspend_enabled) |
2039 | console_start(uport->cons); | |
1da177e4 LT |
2040 | } |
2041 | ||
ccce6deb AC |
2042 | if (port->flags & ASYNC_SUSPENDED) { |
2043 | const struct uart_ops *ops = uport->ops; | |
ee31b337 | 2044 | int ret; |
1da177e4 | 2045 | |
6f538fe3 | 2046 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb AC |
2047 | spin_lock_irq(&uport->lock); |
2048 | ops->set_mctrl(uport, 0); | |
2049 | spin_unlock_irq(&uport->lock); | |
4547be78 | 2050 | if (console_suspend_enabled || !uart_console(uport)) { |
19225135 AC |
2051 | /* Protected by port mutex for now */ |
2052 | struct tty_struct *tty = port->tty; | |
4547be78 SB |
2053 | ret = ops->startup(uport); |
2054 | if (ret == 0) { | |
19225135 AC |
2055 | if (tty) |
2056 | uart_change_speed(tty, state, NULL); | |
4547be78 SB |
2057 | spin_lock_irq(&uport->lock); |
2058 | ops->set_mctrl(uport, uport->mctrl); | |
2059 | ops->start_tx(uport); | |
2060 | spin_unlock_irq(&uport->lock); | |
2061 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
2062 | } else { | |
2063 | /* | |
2064 | * Failed to resume - maybe hardware went away? | |
2065 | * Clear the "initialized" flag so we won't try | |
2066 | * to call the low level drivers shutdown method. | |
2067 | */ | |
19225135 | 2068 | uart_shutdown(tty, state); |
4547be78 | 2069 | } |
ee31b337 | 2070 | } |
a6b93a90 | 2071 | |
ccce6deb | 2072 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
2073 | } |
2074 | ||
a2bceae0 | 2075 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2076 | |
2077 | return 0; | |
2078 | } | |
2079 | ||
2080 | static inline void | |
2081 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2082 | { | |
30b7a3bc RK |
2083 | char address[64]; |
2084 | ||
1da177e4 LT |
2085 | switch (port->iotype) { |
2086 | case UPIO_PORT: | |
9bde10a4 | 2087 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2088 | break; |
2089 | case UPIO_HUB6: | |
30b7a3bc | 2090 | snprintf(address, sizeof(address), |
9bde10a4 | 2091 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2092 | break; |
2093 | case UPIO_MEM: | |
2094 | case UPIO_MEM32: | |
21c614a7 | 2095 | case UPIO_AU: |
3be91ec7 | 2096 | case UPIO_TSI: |
30b7a3bc | 2097 | snprintf(address, sizeof(address), |
4f640efb | 2098 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2099 | break; |
2100 | default: | |
2101 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2102 | break; |
2103 | } | |
30b7a3bc | 2104 | |
2f2dafe7 | 2105 | dev_info(port->dev, "%s%d at %s (irq = %d, base_baud = %d) is a %s\n", |
8440838b DM |
2106 | drv->dev_name, |
2107 | drv->tty_driver->name_base + port->line, | |
7d12b976 | 2108 | address, port->irq, port->uartclk / 16, uart_type(port)); |
1da177e4 LT |
2109 | } |
2110 | ||
2111 | static void | |
2112 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2113 | struct uart_port *port) | |
2114 | { | |
2115 | unsigned int flags; | |
2116 | ||
2117 | /* | |
2118 | * If there isn't a port here, don't do anything further. | |
2119 | */ | |
2120 | if (!port->iobase && !port->mapbase && !port->membase) | |
2121 | return; | |
2122 | ||
2123 | /* | |
2124 | * Now do the auto configuration stuff. Note that config_port | |
2125 | * is expected to claim the resources and map the port for us. | |
2126 | */ | |
8e23fcc8 | 2127 | flags = 0; |
1da177e4 LT |
2128 | if (port->flags & UPF_AUTO_IRQ) |
2129 | flags |= UART_CONFIG_IRQ; | |
2130 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2131 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2132 | port->type = PORT_UNKNOWN; | |
2133 | flags |= UART_CONFIG_TYPE; | |
2134 | } | |
1da177e4 LT |
2135 | port->ops->config_port(port, flags); |
2136 | } | |
2137 | ||
2138 | if (port->type != PORT_UNKNOWN) { | |
2139 | unsigned long flags; | |
2140 | ||
2141 | uart_report_port(drv, port); | |
2142 | ||
3689a0ec | 2143 | /* Power up port for set_mctrl() */ |
6f538fe3 | 2144 | uart_change_pm(state, UART_PM_STATE_ON); |
3689a0ec | 2145 | |
1da177e4 LT |
2146 | /* |
2147 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2148 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2149 | * We probably don't need a spinlock around this, but |
2150 | */ | |
2151 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2152 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2153 | spin_unlock_irqrestore(&port->lock, flags); |
2154 | ||
97d97224 RK |
2155 | /* |
2156 | * If this driver supports console, and it hasn't been | |
2157 | * successfully registered yet, try to re-register it. | |
2158 | * It may be that the port was not available. | |
2159 | */ | |
2160 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2161 | register_console(port->cons); | |
2162 | ||
1da177e4 LT |
2163 | /* |
2164 | * Power down all ports by default, except the | |
2165 | * console if we have one. | |
2166 | */ | |
2167 | if (!uart_console(port)) | |
6f538fe3 | 2168 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 LT |
2169 | } |
2170 | } | |
2171 | ||
f2d937f3 JW |
2172 | #ifdef CONFIG_CONSOLE_POLL |
2173 | ||
2174 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2175 | { | |
2176 | struct uart_driver *drv = driver->driver_state; | |
2177 | struct uart_state *state = drv->state + line; | |
2178 | struct uart_port *port; | |
2179 | int baud = 9600; | |
2180 | int bits = 8; | |
2181 | int parity = 'n'; | |
2182 | int flow = 'n'; | |
c7f3e708 | 2183 | int ret; |
f2d937f3 | 2184 | |
ebd2c8f6 | 2185 | if (!state || !state->uart_port) |
f2d937f3 JW |
2186 | return -1; |
2187 | ||
ebd2c8f6 | 2188 | port = state->uart_port; |
f2d937f3 JW |
2189 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
2190 | return -1; | |
2191 | ||
c7f3e708 AV |
2192 | if (port->ops->poll_init) { |
2193 | struct tty_port *tport = &state->port; | |
2194 | ||
2195 | ret = 0; | |
2196 | mutex_lock(&tport->mutex); | |
2197 | /* | |
2198 | * We don't set ASYNCB_INITIALIZED as we only initialized the | |
2199 | * hw, e.g. state->xmit is still uninitialized. | |
2200 | */ | |
2201 | if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) | |
2202 | ret = port->ops->poll_init(port); | |
2203 | mutex_unlock(&tport->mutex); | |
2204 | if (ret) | |
2205 | return ret; | |
2206 | } | |
2207 | ||
f2d937f3 JW |
2208 | if (options) { |
2209 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2210 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2211 | } | |
2212 | ||
2213 | return 0; | |
2214 | } | |
2215 | ||
2216 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2217 | { | |
2218 | struct uart_driver *drv = driver->driver_state; | |
2219 | struct uart_state *state = drv->state + line; | |
2220 | struct uart_port *port; | |
2221 | ||
ebd2c8f6 | 2222 | if (!state || !state->uart_port) |
f2d937f3 JW |
2223 | return -1; |
2224 | ||
ebd2c8f6 | 2225 | port = state->uart_port; |
f2d937f3 JW |
2226 | return port->ops->poll_get_char(port); |
2227 | } | |
2228 | ||
2229 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2230 | { | |
2231 | struct uart_driver *drv = driver->driver_state; | |
2232 | struct uart_state *state = drv->state + line; | |
2233 | struct uart_port *port; | |
2234 | ||
ebd2c8f6 | 2235 | if (!state || !state->uart_port) |
f2d937f3 JW |
2236 | return; |
2237 | ||
ebd2c8f6 | 2238 | port = state->uart_port; |
c7d44a02 DA |
2239 | |
2240 | if (ch == '\n') | |
2241 | port->ops->poll_put_char(port, '\r'); | |
f2d937f3 JW |
2242 | port->ops->poll_put_char(port, ch); |
2243 | } | |
2244 | #endif | |
2245 | ||
b68e31d0 | 2246 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2247 | .open = uart_open, |
2248 | .close = uart_close, | |
2249 | .write = uart_write, | |
2250 | .put_char = uart_put_char, | |
2251 | .flush_chars = uart_flush_chars, | |
2252 | .write_room = uart_write_room, | |
2253 | .chars_in_buffer= uart_chars_in_buffer, | |
2254 | .flush_buffer = uart_flush_buffer, | |
2255 | .ioctl = uart_ioctl, | |
2256 | .throttle = uart_throttle, | |
2257 | .unthrottle = uart_unthrottle, | |
2258 | .send_xchar = uart_send_xchar, | |
2259 | .set_termios = uart_set_termios, | |
64e9159f | 2260 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2261 | .stop = uart_stop, |
2262 | .start = uart_start, | |
2263 | .hangup = uart_hangup, | |
2264 | .break_ctl = uart_break_ctl, | |
2265 | .wait_until_sent= uart_wait_until_sent, | |
2266 | #ifdef CONFIG_PROC_FS | |
d196a949 | 2267 | .proc_fops = &uart_proc_fops, |
1da177e4 LT |
2268 | #endif |
2269 | .tiocmget = uart_tiocmget, | |
2270 | .tiocmset = uart_tiocmset, | |
d281da7f | 2271 | .get_icount = uart_get_icount, |
f2d937f3 JW |
2272 | #ifdef CONFIG_CONSOLE_POLL |
2273 | .poll_init = uart_poll_init, | |
2274 | .poll_get_char = uart_poll_get_char, | |
2275 | .poll_put_char = uart_poll_put_char, | |
2276 | #endif | |
1da177e4 LT |
2277 | }; |
2278 | ||
de0c8cb3 | 2279 | static const struct tty_port_operations uart_port_ops = { |
0b1db830 JS |
2280 | .activate = uart_port_activate, |
2281 | .shutdown = uart_port_shutdown, | |
de0c8cb3 AC |
2282 | .carrier_raised = uart_carrier_raised, |
2283 | .dtr_rts = uart_dtr_rts, | |
2284 | }; | |
2285 | ||
1da177e4 LT |
2286 | /** |
2287 | * uart_register_driver - register a driver with the uart core layer | |
2288 | * @drv: low level driver structure | |
2289 | * | |
2290 | * Register a uart driver with the core driver. We in turn register | |
2291 | * with the tty layer, and initialise the core driver per-port state. | |
2292 | * | |
2293 | * We have a proc file in /proc/tty/driver which is named after the | |
2294 | * normal driver. | |
2295 | * | |
2296 | * drv->port should be NULL, and the per-port structures should be | |
2297 | * registered using uart_add_one_port after this call has succeeded. | |
2298 | */ | |
2299 | int uart_register_driver(struct uart_driver *drv) | |
2300 | { | |
9e845abf | 2301 | struct tty_driver *normal; |
1da177e4 LT |
2302 | int i, retval; |
2303 | ||
2304 | BUG_ON(drv->state); | |
2305 | ||
2306 | /* | |
2307 | * Maybe we should be using a slab cache for this, especially if | |
2308 | * we have a large number of ports to handle. | |
2309 | */ | |
8f31bb39 | 2310 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2311 | if (!drv->state) |
2312 | goto out; | |
2313 | ||
9e845abf | 2314 | normal = alloc_tty_driver(drv->nr); |
1da177e4 | 2315 | if (!normal) |
9e845abf | 2316 | goto out_kfree; |
1da177e4 LT |
2317 | |
2318 | drv->tty_driver = normal; | |
2319 | ||
1da177e4 | 2320 | normal->driver_name = drv->driver_name; |
1da177e4 LT |
2321 | normal->name = drv->dev_name; |
2322 | normal->major = drv->major; | |
2323 | normal->minor_start = drv->minor; | |
2324 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2325 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2326 | normal->init_termios = tty_std_termios; | |
2327 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2328 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2329 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2330 | normal->driver_state = drv; |
2331 | tty_set_operations(normal, &uart_ops); | |
2332 | ||
2333 | /* | |
2334 | * Initialise the UART state(s). | |
2335 | */ | |
2336 | for (i = 0; i < drv->nr; i++) { | |
2337 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 2338 | struct tty_port *port = &state->port; |
1da177e4 | 2339 | |
a2bceae0 | 2340 | tty_port_init(port); |
de0c8cb3 | 2341 | port->ops = &uart_port_ops; |
4cb0fbfd JS |
2342 | port->close_delay = HZ / 2; /* .5 seconds */ |
2343 | port->closing_wait = 30 * HZ;/* 30 seconds */ | |
1da177e4 LT |
2344 | } |
2345 | ||
2346 | retval = tty_register_driver(normal); | |
9e845abf AGR |
2347 | if (retval >= 0) |
2348 | return retval; | |
2349 | ||
191c5f10 JS |
2350 | for (i = 0; i < drv->nr; i++) |
2351 | tty_port_destroy(&drv->state[i].port); | |
9e845abf AGR |
2352 | put_tty_driver(normal); |
2353 | out_kfree: | |
2354 | kfree(drv->state); | |
2355 | out: | |
2356 | return -ENOMEM; | |
1da177e4 LT |
2357 | } |
2358 | ||
2359 | /** | |
2360 | * uart_unregister_driver - remove a driver from the uart core layer | |
2361 | * @drv: low level driver structure | |
2362 | * | |
2363 | * Remove all references to a driver from the core driver. The low | |
2364 | * level driver must have removed all its ports via the | |
2365 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2366 | * (ie, drv->port == NULL) | |
2367 | */ | |
2368 | void uart_unregister_driver(struct uart_driver *drv) | |
2369 | { | |
2370 | struct tty_driver *p = drv->tty_driver; | |
191c5f10 JS |
2371 | unsigned int i; |
2372 | ||
1da177e4 LT |
2373 | tty_unregister_driver(p); |
2374 | put_tty_driver(p); | |
191c5f10 JS |
2375 | for (i = 0; i < drv->nr; i++) |
2376 | tty_port_destroy(&drv->state[i].port); | |
1da177e4 | 2377 | kfree(drv->state); |
1e66cded | 2378 | drv->state = NULL; |
1da177e4 LT |
2379 | drv->tty_driver = NULL; |
2380 | } | |
2381 | ||
2382 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2383 | { | |
2384 | struct uart_driver *p = co->data; | |
2385 | *index = co->index; | |
2386 | return p->tty_driver; | |
2387 | } | |
2388 | ||
6915c0e4 TH |
2389 | static ssize_t uart_get_attr_uartclk(struct device *dev, |
2390 | struct device_attribute *attr, char *buf) | |
2391 | { | |
bebe73e3 | 2392 | struct serial_struct tmp; |
6915c0e4 | 2393 | struct tty_port *port = dev_get_drvdata(dev); |
6915c0e4 | 2394 | |
9f109694 | 2395 | uart_get_info(port, &tmp); |
bebe73e3 | 2396 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); |
6915c0e4 TH |
2397 | } |
2398 | ||
373bac4c AC |
2399 | static ssize_t uart_get_attr_type(struct device *dev, |
2400 | struct device_attribute *attr, char *buf) | |
2401 | { | |
2402 | struct serial_struct tmp; | |
2403 | struct tty_port *port = dev_get_drvdata(dev); | |
2404 | ||
2405 | uart_get_info(port, &tmp); | |
2406 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); | |
2407 | } | |
2408 | static ssize_t uart_get_attr_line(struct device *dev, | |
2409 | struct device_attribute *attr, char *buf) | |
2410 | { | |
2411 | struct serial_struct tmp; | |
2412 | struct tty_port *port = dev_get_drvdata(dev); | |
2413 | ||
2414 | uart_get_info(port, &tmp); | |
2415 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); | |
2416 | } | |
2417 | ||
2418 | static ssize_t uart_get_attr_port(struct device *dev, | |
2419 | struct device_attribute *attr, char *buf) | |
2420 | { | |
2421 | struct serial_struct tmp; | |
2422 | struct tty_port *port = dev_get_drvdata(dev); | |
fd985e1d | 2423 | unsigned long ioaddr; |
373bac4c AC |
2424 | |
2425 | uart_get_info(port, &tmp); | |
fd985e1d AM |
2426 | ioaddr = tmp.port; |
2427 | if (HIGH_BITS_OFFSET) | |
2428 | ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; | |
2429 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); | |
373bac4c AC |
2430 | } |
2431 | ||
2432 | static ssize_t uart_get_attr_irq(struct device *dev, | |
2433 | struct device_attribute *attr, char *buf) | |
2434 | { | |
2435 | struct serial_struct tmp; | |
2436 | struct tty_port *port = dev_get_drvdata(dev); | |
2437 | ||
2438 | uart_get_info(port, &tmp); | |
2439 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); | |
2440 | } | |
2441 | ||
2442 | static ssize_t uart_get_attr_flags(struct device *dev, | |
2443 | struct device_attribute *attr, char *buf) | |
2444 | { | |
2445 | struct serial_struct tmp; | |
2446 | struct tty_port *port = dev_get_drvdata(dev); | |
2447 | ||
2448 | uart_get_info(port, &tmp); | |
2449 | return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); | |
2450 | } | |
2451 | ||
2452 | static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, | |
2453 | struct device_attribute *attr, char *buf) | |
2454 | { | |
2455 | struct serial_struct tmp; | |
2456 | struct tty_port *port = dev_get_drvdata(dev); | |
2457 | ||
2458 | uart_get_info(port, &tmp); | |
2459 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); | |
2460 | } | |
2461 | ||
2462 | ||
2463 | static ssize_t uart_get_attr_close_delay(struct device *dev, | |
2464 | struct device_attribute *attr, char *buf) | |
2465 | { | |
2466 | struct serial_struct tmp; | |
2467 | struct tty_port *port = dev_get_drvdata(dev); | |
2468 | ||
2469 | uart_get_info(port, &tmp); | |
2470 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); | |
2471 | } | |
2472 | ||
2473 | ||
2474 | static ssize_t uart_get_attr_closing_wait(struct device *dev, | |
2475 | struct device_attribute *attr, char *buf) | |
2476 | { | |
2477 | struct serial_struct tmp; | |
2478 | struct tty_port *port = dev_get_drvdata(dev); | |
2479 | ||
2480 | uart_get_info(port, &tmp); | |
2481 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); | |
2482 | } | |
2483 | ||
2484 | static ssize_t uart_get_attr_custom_divisor(struct device *dev, | |
2485 | struct device_attribute *attr, char *buf) | |
2486 | { | |
2487 | struct serial_struct tmp; | |
2488 | struct tty_port *port = dev_get_drvdata(dev); | |
2489 | ||
2490 | uart_get_info(port, &tmp); | |
2491 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); | |
2492 | } | |
2493 | ||
2494 | static ssize_t uart_get_attr_io_type(struct device *dev, | |
2495 | struct device_attribute *attr, char *buf) | |
2496 | { | |
2497 | struct serial_struct tmp; | |
2498 | struct tty_port *port = dev_get_drvdata(dev); | |
2499 | ||
2500 | uart_get_info(port, &tmp); | |
2501 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); | |
2502 | } | |
2503 | ||
2504 | static ssize_t uart_get_attr_iomem_base(struct device *dev, | |
2505 | struct device_attribute *attr, char *buf) | |
2506 | { | |
2507 | struct serial_struct tmp; | |
2508 | struct tty_port *port = dev_get_drvdata(dev); | |
2509 | ||
2510 | uart_get_info(port, &tmp); | |
2511 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); | |
2512 | } | |
2513 | ||
2514 | static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, | |
2515 | struct device_attribute *attr, char *buf) | |
2516 | { | |
2517 | struct serial_struct tmp; | |
2518 | struct tty_port *port = dev_get_drvdata(dev); | |
2519 | ||
2520 | uart_get_info(port, &tmp); | |
2521 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); | |
2522 | } | |
2523 | ||
2524 | static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); | |
2525 | static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); | |
2526 | static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); | |
2527 | static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); | |
2528 | static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); | |
2529 | static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); | |
6915c0e4 | 2530 | static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); |
373bac4c AC |
2531 | static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); |
2532 | static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); | |
2533 | static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); | |
2534 | static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); | |
2535 | static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); | |
2536 | static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); | |
6915c0e4 TH |
2537 | |
2538 | static struct attribute *tty_dev_attrs[] = { | |
373bac4c AC |
2539 | &dev_attr_type.attr, |
2540 | &dev_attr_line.attr, | |
2541 | &dev_attr_port.attr, | |
2542 | &dev_attr_irq.attr, | |
2543 | &dev_attr_flags.attr, | |
2544 | &dev_attr_xmit_fifo_size.attr, | |
6915c0e4 | 2545 | &dev_attr_uartclk.attr, |
373bac4c AC |
2546 | &dev_attr_close_delay.attr, |
2547 | &dev_attr_closing_wait.attr, | |
2548 | &dev_attr_custom_divisor.attr, | |
2549 | &dev_attr_io_type.attr, | |
2550 | &dev_attr_iomem_base.attr, | |
2551 | &dev_attr_iomem_reg_shift.attr, | |
6915c0e4 TH |
2552 | NULL, |
2553 | }; | |
2554 | ||
b1b79916 | 2555 | static const struct attribute_group tty_dev_attr_group = { |
6915c0e4 TH |
2556 | .attrs = tty_dev_attrs, |
2557 | }; | |
2558 | ||
1da177e4 LT |
2559 | /** |
2560 | * uart_add_one_port - attach a driver-defined port structure | |
2561 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2562 | * @uport: uart port structure to use for this port. |
1da177e4 LT |
2563 | * |
2564 | * This allows the driver to register its own uart_port structure | |
2565 | * with the core driver. The main purpose is to allow the low | |
2566 | * level uart drivers to expand uart_port, rather than having yet | |
2567 | * more levels of structures. | |
2568 | */ | |
a2bceae0 | 2569 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 LT |
2570 | { |
2571 | struct uart_state *state; | |
a2bceae0 | 2572 | struct tty_port *port; |
1da177e4 | 2573 | int ret = 0; |
b3b708fa | 2574 | struct device *tty_dev; |
266dcff0 | 2575 | int num_groups; |
1da177e4 LT |
2576 | |
2577 | BUG_ON(in_interrupt()); | |
2578 | ||
a2bceae0 | 2579 | if (uport->line >= drv->nr) |
1da177e4 LT |
2580 | return -EINVAL; |
2581 | ||
a2bceae0 AC |
2582 | state = drv->state + uport->line; |
2583 | port = &state->port; | |
1da177e4 | 2584 | |
f392ecfa | 2585 | mutex_lock(&port_mutex); |
a2bceae0 | 2586 | mutex_lock(&port->mutex); |
ebd2c8f6 | 2587 | if (state->uart_port) { |
1da177e4 LT |
2588 | ret = -EINVAL; |
2589 | goto out; | |
2590 | } | |
2591 | ||
a2bceae0 | 2592 | state->uart_port = uport; |
6f538fe3 | 2593 | state->pm_state = UART_PM_STATE_UNDEFINED; |
1da177e4 | 2594 | |
a2bceae0 AC |
2595 | uport->cons = drv->cons; |
2596 | uport->state = state; | |
1da177e4 | 2597 | |
976ecd12 RK |
2598 | /* |
2599 | * If this port is a console, then the spinlock is already | |
2600 | * initialised. | |
2601 | */ | |
a2bceae0 AC |
2602 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
2603 | spin_lock_init(&uport->lock); | |
2604 | lockdep_set_class(&uport->lock, &port_lock_key); | |
13e83599 | 2605 | } |
a208ffd2 GL |
2606 | if (uport->cons && uport->dev) |
2607 | of_console_check(uport->dev->of_node, uport->cons->name, uport->line); | |
976ecd12 | 2608 | |
a2bceae0 | 2609 | uart_configure_port(drv, state, uport); |
1da177e4 | 2610 | |
266dcff0 GKH |
2611 | num_groups = 2; |
2612 | if (uport->attr_group) | |
2613 | num_groups++; | |
2614 | ||
c2b703b8 | 2615 | uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), |
266dcff0 GKH |
2616 | GFP_KERNEL); |
2617 | if (!uport->tty_groups) { | |
2618 | ret = -ENOMEM; | |
2619 | goto out; | |
2620 | } | |
2621 | uport->tty_groups[0] = &tty_dev_attr_group; | |
2622 | if (uport->attr_group) | |
2623 | uport->tty_groups[1] = uport->attr_group; | |
2624 | ||
1da177e4 LT |
2625 | /* |
2626 | * Register the port whether it's detected or not. This allows | |
015355b7 | 2627 | * setserial to be used to alter this port's parameters. |
1da177e4 | 2628 | */ |
b1b79916 | 2629 | tty_dev = tty_port_register_device_attr(port, drv->tty_driver, |
266dcff0 | 2630 | uport->line, uport->dev, port, uport->tty_groups); |
b3b708fa | 2631 | if (likely(!IS_ERR(tty_dev))) { |
77359835 SG |
2632 | device_set_wakeup_capable(tty_dev, 1); |
2633 | } else { | |
2f2dafe7 | 2634 | dev_err(uport->dev, "Cannot register tty device on line %d\n", |
a2bceae0 | 2635 | uport->line); |
77359835 | 2636 | } |
1da177e4 | 2637 | |
68ac64cd RK |
2638 | /* |
2639 | * Ensure UPF_DEAD is not set. | |
2640 | */ | |
a2bceae0 | 2641 | uport->flags &= ~UPF_DEAD; |
68ac64cd | 2642 | |
1da177e4 | 2643 | out: |
a2bceae0 | 2644 | mutex_unlock(&port->mutex); |
f392ecfa | 2645 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2646 | |
2647 | return ret; | |
2648 | } | |
2649 | ||
2650 | /** | |
2651 | * uart_remove_one_port - detach a driver defined port structure | |
2652 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2653 | * @uport: uart port structure for this port |
1da177e4 LT |
2654 | * |
2655 | * This unhooks (and hangs up) the specified port structure from the | |
2656 | * core driver. No further calls will be made to the low-level code | |
2657 | * for this port. | |
2658 | */ | |
a2bceae0 | 2659 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2660 | { |
a2bceae0 AC |
2661 | struct uart_state *state = drv->state + uport->line; |
2662 | struct tty_port *port = &state->port; | |
4c6d5b4d | 2663 | struct tty_struct *tty; |
b342dd51 | 2664 | int ret = 0; |
1da177e4 LT |
2665 | |
2666 | BUG_ON(in_interrupt()); | |
2667 | ||
a2bceae0 | 2668 | if (state->uart_port != uport) |
2f2dafe7 | 2669 | dev_alert(uport->dev, "Removing wrong port: %p != %p\n", |
a2bceae0 | 2670 | state->uart_port, uport); |
1da177e4 | 2671 | |
f392ecfa | 2672 | mutex_lock(&port_mutex); |
1da177e4 | 2673 | |
68ac64cd RK |
2674 | /* |
2675 | * Mark the port "dead" - this prevents any opens from | |
2676 | * succeeding while we shut down the port. | |
2677 | */ | |
a2bceae0 | 2678 | mutex_lock(&port->mutex); |
b342dd51 CG |
2679 | if (!state->uart_port) { |
2680 | mutex_unlock(&port->mutex); | |
2681 | ret = -EINVAL; | |
2682 | goto out; | |
2683 | } | |
a2bceae0 AC |
2684 | uport->flags |= UPF_DEAD; |
2685 | mutex_unlock(&port->mutex); | |
68ac64cd | 2686 | |
1da177e4 | 2687 | /* |
aa4148cf | 2688 | * Remove the devices from the tty layer |
1da177e4 | 2689 | */ |
a2bceae0 | 2690 | tty_unregister_device(drv->tty_driver, uport->line); |
1da177e4 | 2691 | |
4c6d5b4d GU |
2692 | tty = tty_port_tty_get(port); |
2693 | if (tty) { | |
a2bceae0 | 2694 | tty_vhangup(port->tty); |
4c6d5b4d GU |
2695 | tty_kref_put(tty); |
2696 | } | |
68ac64cd | 2697 | |
5f5c9ae5 GU |
2698 | /* |
2699 | * If the port is used as a console, unregister it | |
2700 | */ | |
2701 | if (uart_console(uport)) | |
2702 | unregister_console(uport->cons); | |
2703 | ||
68ac64cd RK |
2704 | /* |
2705 | * Free the port IO and memory resources, if any. | |
2706 | */ | |
a2bceae0 AC |
2707 | if (uport->type != PORT_UNKNOWN) |
2708 | uport->ops->release_port(uport); | |
266dcff0 | 2709 | kfree(uport->tty_groups); |
68ac64cd RK |
2710 | |
2711 | /* | |
2712 | * Indicate that there isn't a port here anymore. | |
2713 | */ | |
a2bceae0 | 2714 | uport->type = PORT_UNKNOWN; |
68ac64cd | 2715 | |
ebd2c8f6 | 2716 | state->uart_port = NULL; |
b342dd51 | 2717 | out: |
f392ecfa | 2718 | mutex_unlock(&port_mutex); |
1da177e4 | 2719 | |
b342dd51 | 2720 | return ret; |
1da177e4 LT |
2721 | } |
2722 | ||
2723 | /* | |
2724 | * Are the two ports equivalent? | |
2725 | */ | |
2726 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2727 | { | |
2728 | if (port1->iotype != port2->iotype) | |
2729 | return 0; | |
2730 | ||
2731 | switch (port1->iotype) { | |
2732 | case UPIO_PORT: | |
2733 | return (port1->iobase == port2->iobase); | |
2734 | case UPIO_HUB6: | |
2735 | return (port1->iobase == port2->iobase) && | |
2736 | (port1->hub6 == port2->hub6); | |
2737 | case UPIO_MEM: | |
d21b55d3 SS |
2738 | case UPIO_MEM32: |
2739 | case UPIO_AU: | |
2740 | case UPIO_TSI: | |
1624f003 | 2741 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2742 | } |
2743 | return 0; | |
2744 | } | |
2745 | EXPORT_SYMBOL(uart_match_port); | |
2746 | ||
027d7dac JS |
2747 | /** |
2748 | * uart_handle_dcd_change - handle a change of carrier detect state | |
2749 | * @uport: uart_port structure for the open port | |
2750 | * @status: new carrier detect status, nonzero if active | |
2751 | */ | |
2752 | void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) | |
2753 | { | |
42381572 | 2754 | struct tty_port *port = &uport->state->port; |
43eca0ae | 2755 | struct tty_struct *tty = port->tty; |
42381572 | 2756 | struct tty_ldisc *ld = tty ? tty_ldisc_ref(tty) : NULL; |
027d7dac | 2757 | |
42381572 GS |
2758 | if (ld) { |
2759 | if (ld->ops->dcd_change) | |
2760 | ld->ops->dcd_change(tty, status); | |
2761 | tty_ldisc_deref(ld); | |
2762 | } | |
027d7dac JS |
2763 | |
2764 | uport->icount.dcd++; | |
027d7dac JS |
2765 | |
2766 | if (port->flags & ASYNC_CHECK_CD) { | |
2767 | if (status) | |
2768 | wake_up_interruptible(&port->open_wait); | |
43eca0ae AC |
2769 | else if (tty) |
2770 | tty_hangup(tty); | |
027d7dac | 2771 | } |
027d7dac JS |
2772 | } |
2773 | EXPORT_SYMBOL_GPL(uart_handle_dcd_change); | |
2774 | ||
2775 | /** | |
2776 | * uart_handle_cts_change - handle a change of clear-to-send state | |
2777 | * @uport: uart_port structure for the open port | |
2778 | * @status: new clear to send status, nonzero if active | |
2779 | */ | |
2780 | void uart_handle_cts_change(struct uart_port *uport, unsigned int status) | |
2781 | { | |
2782 | struct tty_port *port = &uport->state->port; | |
2783 | struct tty_struct *tty = port->tty; | |
2784 | ||
2785 | uport->icount.cts++; | |
2786 | ||
a6eec92e | 2787 | if (tty_port_cts_enabled(port)) { |
027d7dac JS |
2788 | if (tty->hw_stopped) { |
2789 | if (status) { | |
2790 | tty->hw_stopped = 0; | |
2791 | uport->ops->start_tx(uport); | |
2792 | uart_write_wakeup(uport); | |
2793 | } | |
2794 | } else { | |
2795 | if (!status) { | |
2796 | tty->hw_stopped = 1; | |
2797 | uport->ops->stop_tx(uport); | |
2798 | } | |
2799 | } | |
2800 | } | |
2801 | } | |
2802 | EXPORT_SYMBOL_GPL(uart_handle_cts_change); | |
2803 | ||
cf75525f JS |
2804 | /** |
2805 | * uart_insert_char - push a char to the uart layer | |
2806 | * | |
2807 | * User is responsible to call tty_flip_buffer_push when they are done with | |
2808 | * insertion. | |
2809 | * | |
2810 | * @port: corresponding port | |
2811 | * @status: state of the serial port RX buffer (LSR for 8250) | |
2812 | * @overrun: mask of overrun bits in @status | |
2813 | * @ch: character to push | |
2814 | * @flag: flag for the character (see TTY_NORMAL and friends) | |
2815 | */ | |
027d7dac JS |
2816 | void uart_insert_char(struct uart_port *port, unsigned int status, |
2817 | unsigned int overrun, unsigned int ch, unsigned int flag) | |
2818 | { | |
92a19f9c | 2819 | struct tty_port *tport = &port->state->port; |
027d7dac JS |
2820 | |
2821 | if ((status & port->ignore_status_mask & ~overrun) == 0) | |
92a19f9c | 2822 | if (tty_insert_flip_char(tport, ch, flag) == 0) |
dabfb351 | 2823 | ++port->icount.buf_overrun; |
027d7dac JS |
2824 | |
2825 | /* | |
2826 | * Overrun is special. Since it's reported immediately, | |
2827 | * it doesn't affect the current character. | |
2828 | */ | |
2829 | if (status & ~port->ignore_status_mask & overrun) | |
92a19f9c | 2830 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) |
dabfb351 | 2831 | ++port->icount.buf_overrun; |
027d7dac JS |
2832 | } |
2833 | EXPORT_SYMBOL_GPL(uart_insert_char); | |
2834 | ||
1da177e4 LT |
2835 | EXPORT_SYMBOL(uart_write_wakeup); |
2836 | EXPORT_SYMBOL(uart_register_driver); | |
2837 | EXPORT_SYMBOL(uart_unregister_driver); | |
2838 | EXPORT_SYMBOL(uart_suspend_port); | |
2839 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2840 | EXPORT_SYMBOL(uart_add_one_port); |
2841 | EXPORT_SYMBOL(uart_remove_one_port); | |
2842 | ||
2843 | MODULE_DESCRIPTION("Serial driver core"); | |
2844 | MODULE_LICENSE("GPL"); |