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 | ||
299245a1 PH |
62 | static int uart_dcd_enabled(struct uart_port *uport) |
63 | { | |
d4260b51 | 64 | return !!(uport->status & UPSTAT_DCD_ENABLE); |
299245a1 PH |
65 | } |
66 | ||
1da177e4 LT |
67 | /* |
68 | * This routine is used by the interrupt handler to schedule processing in | |
69 | * the software interrupt portion of the driver. | |
70 | */ | |
71 | void uart_write_wakeup(struct uart_port *port) | |
72 | { | |
ebd2c8f6 | 73 | struct uart_state *state = port->state; |
d5f735e5 PM |
74 | /* |
75 | * This means you called this function _after_ the port was | |
76 | * closed. No cookie for you. | |
77 | */ | |
ebd2c8f6 | 78 | BUG_ON(!state); |
6a3e492b | 79 | tty_wakeup(state->port.tty); |
1da177e4 LT |
80 | } |
81 | ||
82 | static void uart_stop(struct tty_struct *tty) | |
83 | { | |
84 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 85 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
86 | unsigned long flags; |
87 | ||
88 | spin_lock_irqsave(&port->lock, flags); | |
b129a8cc | 89 | port->ops->stop_tx(port); |
1da177e4 LT |
90 | spin_unlock_irqrestore(&port->lock, flags); |
91 | } | |
92 | ||
93 | static void __uart_start(struct tty_struct *tty) | |
94 | { | |
95 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 96 | struct uart_port *port = state->uart_port; |
1da177e4 | 97 | |
d01f4d18 | 98 | if (!uart_tx_stopped(port)) |
b129a8cc | 99 | port->ops->start_tx(port); |
1da177e4 LT |
100 | } |
101 | ||
102 | static void uart_start(struct tty_struct *tty) | |
103 | { | |
104 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 105 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
106 | unsigned long flags; |
107 | ||
108 | spin_lock_irqsave(&port->lock, flags); | |
109 | __uart_start(tty); | |
110 | spin_unlock_irqrestore(&port->lock, flags); | |
111 | } | |
112 | ||
1da177e4 LT |
113 | static inline void |
114 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) | |
115 | { | |
116 | unsigned long flags; | |
117 | unsigned int old; | |
118 | ||
119 | spin_lock_irqsave(&port->lock, flags); | |
120 | old = port->mctrl; | |
121 | port->mctrl = (old & ~clear) | set; | |
122 | if (old != port->mctrl) | |
123 | port->ops->set_mctrl(port, port->mctrl); | |
124 | spin_unlock_irqrestore(&port->lock, flags); | |
125 | } | |
126 | ||
a46c9994 AC |
127 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
128 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) | |
1da177e4 LT |
129 | |
130 | /* | |
131 | * Startup the port. This will be called once per open. All calls | |
df4f4dd4 | 132 | * will be serialised by the per-port mutex. |
1da177e4 | 133 | */ |
c0d92be6 JS |
134 | static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, |
135 | int init_hw) | |
1da177e4 | 136 | { |
46d57a44 | 137 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
138 | unsigned long page; |
139 | int retval = 0; | |
140 | ||
46d57a44 | 141 | if (uport->type == PORT_UNKNOWN) |
c0d92be6 | 142 | return 1; |
1da177e4 | 143 | |
7deb39ed TP |
144 | /* |
145 | * Make sure the device is in D0 state. | |
146 | */ | |
147 | uart_change_pm(state, UART_PM_STATE_ON); | |
148 | ||
1da177e4 LT |
149 | /* |
150 | * Initialise and allocate the transmit and temporary | |
151 | * buffer. | |
152 | */ | |
ebd2c8f6 | 153 | if (!state->xmit.buf) { |
df4f4dd4 | 154 | /* This is protected by the per port mutex */ |
1da177e4 LT |
155 | page = get_zeroed_page(GFP_KERNEL); |
156 | if (!page) | |
157 | return -ENOMEM; | |
158 | ||
ebd2c8f6 AC |
159 | state->xmit.buf = (unsigned char *) page; |
160 | uart_circ_clear(&state->xmit); | |
1da177e4 LT |
161 | } |
162 | ||
46d57a44 | 163 | retval = uport->ops->startup(uport); |
1da177e4 | 164 | if (retval == 0) { |
c7d7abff | 165 | if (uart_console(uport) && uport->cons->cflag) { |
adc8d746 | 166 | tty->termios.c_cflag = uport->cons->cflag; |
c7d7abff JS |
167 | uport->cons->cflag = 0; |
168 | } | |
169 | /* | |
170 | * Initialise the hardware port settings. | |
171 | */ | |
172 | uart_change_speed(tty, state, NULL); | |
1da177e4 | 173 | |
c7d7abff | 174 | if (init_hw) { |
1da177e4 LT |
175 | /* |
176 | * Setup the RTS and DTR signals once the | |
177 | * port is open and ready to respond. | |
178 | */ | |
adc8d746 | 179 | if (tty->termios.c_cflag & CBAUD) |
46d57a44 | 180 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 181 | } |
a6eec92e | 182 | |
299245a1 | 183 | spin_lock_irq(&uport->lock); |
d01f4d18 PH |
184 | if (uart_cts_enabled(uport) && |
185 | !(uport->ops->get_mctrl(uport) & TIOCM_CTS)) | |
186 | uport->hw_stopped = 1; | |
187 | else | |
188 | uport->hw_stopped = 0; | |
299245a1 | 189 | spin_unlock_irq(&uport->lock); |
1da177e4 LT |
190 | } |
191 | ||
0055197e JS |
192 | /* |
193 | * This is to allow setserial on this port. People may want to set | |
194 | * port/irq/type and then reconfigure the port properly if it failed | |
195 | * now. | |
196 | */ | |
1da177e4 | 197 | if (retval && capable(CAP_SYS_ADMIN)) |
c0d92be6 JS |
198 | return 1; |
199 | ||
200 | return retval; | |
201 | } | |
202 | ||
203 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, | |
204 | int init_hw) | |
205 | { | |
206 | struct tty_port *port = &state->port; | |
207 | int retval; | |
208 | ||
209 | if (port->flags & ASYNC_INITIALIZED) | |
210 | return 0; | |
211 | ||
212 | /* | |
213 | * Set the TTY IO error marker - we will only clear this | |
214 | * once we have successfully opened the port. | |
215 | */ | |
216 | set_bit(TTY_IO_ERROR, &tty->flags); | |
217 | ||
218 | retval = uart_port_startup(tty, state, init_hw); | |
219 | if (!retval) { | |
220 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
221 | clear_bit(TTY_IO_ERROR, &tty->flags); | |
222 | } else if (retval > 0) | |
1da177e4 LT |
223 | retval = 0; |
224 | ||
225 | return retval; | |
226 | } | |
227 | ||
228 | /* | |
229 | * This routine will shutdown a serial port; interrupts are disabled, and | |
230 | * DTR is dropped if the hangup on close termio flag is on. Calls to | |
231 | * uart_shutdown are serialised by the per-port semaphore. | |
232 | */ | |
19225135 | 233 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
1da177e4 | 234 | { |
ccce6deb | 235 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 236 | struct tty_port *port = &state->port; |
1da177e4 | 237 | |
1da177e4 | 238 | /* |
ee31b337 | 239 | * Set the TTY IO error marker |
1da177e4 | 240 | */ |
f751928e AC |
241 | if (tty) |
242 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 243 | |
bdc04e31 | 244 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
ee31b337 RK |
245 | /* |
246 | * Turn off DTR and RTS early. | |
247 | */ | |
ae84db96 PH |
248 | if (uart_console(uport) && tty) |
249 | uport->cons->cflag = tty->termios.c_cflag; | |
250 | ||
adc8d746 | 251 | if (!tty || (tty->termios.c_cflag & HUPCL)) |
ccce6deb | 252 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
ee31b337 | 253 | |
b922e19d | 254 | uart_port_shutdown(port); |
ee31b337 | 255 | } |
1da177e4 LT |
256 | |
257 | /* | |
d208a3bf DA |
258 | * It's possible for shutdown to be called after suspend if we get |
259 | * a DCD drop (hangup) at just the right time. Clear suspended bit so | |
260 | * we don't try to resume a port that has been shutdown. | |
1da177e4 | 261 | */ |
d208a3bf | 262 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
263 | |
264 | /* | |
265 | * Free the transmit buffer page. | |
266 | */ | |
ebd2c8f6 AC |
267 | if (state->xmit.buf) { |
268 | free_page((unsigned long)state->xmit.buf); | |
269 | state->xmit.buf = NULL; | |
1da177e4 | 270 | } |
1da177e4 LT |
271 | } |
272 | ||
273 | /** | |
274 | * uart_update_timeout - update per-port FIFO timeout. | |
275 | * @port: uart_port structure describing the port | |
276 | * @cflag: termios cflag value | |
277 | * @baud: speed of the port | |
278 | * | |
279 | * Set the port FIFO timeout value. The @cflag value should | |
280 | * reflect the actual hardware settings. | |
281 | */ | |
282 | void | |
283 | uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
284 | unsigned int baud) | |
285 | { | |
286 | unsigned int bits; | |
287 | ||
288 | /* byte size and parity */ | |
289 | switch (cflag & CSIZE) { | |
290 | case CS5: | |
291 | bits = 7; | |
292 | break; | |
293 | case CS6: | |
294 | bits = 8; | |
295 | break; | |
296 | case CS7: | |
297 | bits = 9; | |
298 | break; | |
299 | default: | |
300 | bits = 10; | |
a46c9994 | 301 | break; /* CS8 */ |
1da177e4 LT |
302 | } |
303 | ||
304 | if (cflag & CSTOPB) | |
305 | bits++; | |
306 | if (cflag & PARENB) | |
307 | bits++; | |
308 | ||
309 | /* | |
310 | * The total number of bits to be transmitted in the fifo. | |
311 | */ | |
312 | bits = bits * port->fifosize; | |
313 | ||
314 | /* | |
315 | * Figure the timeout to send the above number of bits. | |
316 | * Add .02 seconds of slop | |
317 | */ | |
318 | port->timeout = (HZ * bits) / baud + HZ/50; | |
319 | } | |
320 | ||
321 | EXPORT_SYMBOL(uart_update_timeout); | |
322 | ||
323 | /** | |
324 | * uart_get_baud_rate - return baud rate for a particular port | |
325 | * @port: uart_port structure describing the port in question. | |
326 | * @termios: desired termios settings. | |
327 | * @old: old termios (or NULL) | |
328 | * @min: minimum acceptable baud rate | |
329 | * @max: maximum acceptable baud rate | |
330 | * | |
331 | * Decode the termios structure into a numeric baud rate, | |
332 | * taking account of the magic 38400 baud rate (with spd_* | |
333 | * flags), and mapping the %B0 rate to 9600 baud. | |
334 | * | |
335 | * If the new baud rate is invalid, try the old termios setting. | |
336 | * If it's still invalid, we try 9600 baud. | |
337 | * | |
338 | * Update the @termios structure to reflect the baud rate | |
eb424fd2 AC |
339 | * we're actually going to be using. Don't do this for the case |
340 | * where B0 is requested ("hang up"). | |
1da177e4 LT |
341 | */ |
342 | unsigned int | |
606d099c AC |
343 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
344 | struct ktermios *old, unsigned int min, unsigned int max) | |
1da177e4 LT |
345 | { |
346 | unsigned int try, baud, altbaud = 38400; | |
eb424fd2 | 347 | int hung_up = 0; |
0077d45e | 348 | upf_t flags = port->flags & UPF_SPD_MASK; |
1da177e4 LT |
349 | |
350 | if (flags == UPF_SPD_HI) | |
351 | altbaud = 57600; | |
82cb7ba1 | 352 | else if (flags == UPF_SPD_VHI) |
1da177e4 | 353 | altbaud = 115200; |
82cb7ba1 | 354 | else if (flags == UPF_SPD_SHI) |
1da177e4 | 355 | altbaud = 230400; |
82cb7ba1 | 356 | else if (flags == UPF_SPD_WARP) |
1da177e4 LT |
357 | altbaud = 460800; |
358 | ||
359 | for (try = 0; try < 2; try++) { | |
360 | baud = tty_termios_baud_rate(termios); | |
361 | ||
362 | /* | |
363 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... | |
364 | * Die! Die! Die! | |
365 | */ | |
547039ec | 366 | if (try == 0 && baud == 38400) |
1da177e4 LT |
367 | baud = altbaud; |
368 | ||
369 | /* | |
370 | * Special case: B0 rate. | |
371 | */ | |
eb424fd2 AC |
372 | if (baud == 0) { |
373 | hung_up = 1; | |
1da177e4 | 374 | baud = 9600; |
eb424fd2 | 375 | } |
1da177e4 LT |
376 | |
377 | if (baud >= min && baud <= max) | |
378 | return baud; | |
379 | ||
380 | /* | |
381 | * Oops, the quotient was zero. Try again with | |
382 | * the old baud rate if possible. | |
383 | */ | |
384 | termios->c_cflag &= ~CBAUD; | |
385 | if (old) { | |
6d4d67be | 386 | baud = tty_termios_baud_rate(old); |
eb424fd2 AC |
387 | if (!hung_up) |
388 | tty_termios_encode_baud_rate(termios, | |
389 | baud, baud); | |
1da177e4 LT |
390 | old = NULL; |
391 | continue; | |
392 | } | |
393 | ||
394 | /* | |
16ae2a87 AC |
395 | * As a last resort, if the range cannot be met then clip to |
396 | * the nearest chip supported rate. | |
1da177e4 | 397 | */ |
16ae2a87 AC |
398 | if (!hung_up) { |
399 | if (baud <= min) | |
400 | tty_termios_encode_baud_rate(termios, | |
401 | min + 1, min + 1); | |
402 | else | |
403 | tty_termios_encode_baud_rate(termios, | |
404 | max - 1, max - 1); | |
405 | } | |
1da177e4 | 406 | } |
16ae2a87 AC |
407 | /* Should never happen */ |
408 | WARN_ON(1); | |
1da177e4 LT |
409 | return 0; |
410 | } | |
411 | ||
412 | EXPORT_SYMBOL(uart_get_baud_rate); | |
413 | ||
414 | /** | |
415 | * uart_get_divisor - return uart clock divisor | |
416 | * @port: uart_port structure describing the port. | |
417 | * @baud: desired baud rate | |
418 | * | |
419 | * Calculate the uart clock divisor for the port. | |
420 | */ | |
421 | unsigned int | |
422 | uart_get_divisor(struct uart_port *port, unsigned int baud) | |
423 | { | |
424 | unsigned int quot; | |
425 | ||
426 | /* | |
427 | * Old custom speed handling. | |
428 | */ | |
429 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
430 | quot = port->custom_divisor; | |
431 | else | |
97d24634 | 432 | quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); |
1da177e4 LT |
433 | |
434 | return quot; | |
435 | } | |
436 | ||
437 | EXPORT_SYMBOL(uart_get_divisor); | |
438 | ||
7c8ab967 | 439 | /* Caller holds port mutex */ |
19225135 AC |
440 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
441 | struct ktermios *old_termios) | |
1da177e4 | 442 | { |
ccce6deb | 443 | struct uart_port *uport = state->uart_port; |
606d099c | 444 | struct ktermios *termios; |
1da177e4 LT |
445 | |
446 | /* | |
447 | * If we have no tty, termios, or the port does not exist, | |
448 | * then we can't set the parameters for this port. | |
449 | */ | |
adc8d746 | 450 | if (!tty || uport->type == PORT_UNKNOWN) |
1da177e4 LT |
451 | return; |
452 | ||
adc8d746 | 453 | termios = &tty->termios; |
c18b55fd | 454 | uport->ops->set_termios(uport, termios, old_termios); |
1da177e4 LT |
455 | |
456 | /* | |
299245a1 | 457 | * Set modem status enables based on termios cflag |
1da177e4 | 458 | */ |
299245a1 | 459 | spin_lock_irq(&uport->lock); |
1da177e4 | 460 | if (termios->c_cflag & CRTSCTS) |
299245a1 | 461 | uport->status |= UPSTAT_CTS_ENABLE; |
1da177e4 | 462 | else |
299245a1 | 463 | uport->status &= ~UPSTAT_CTS_ENABLE; |
1da177e4 LT |
464 | |
465 | if (termios->c_cflag & CLOCAL) | |
299245a1 | 466 | uport->status &= ~UPSTAT_DCD_ENABLE; |
1da177e4 | 467 | else |
299245a1 PH |
468 | uport->status |= UPSTAT_DCD_ENABLE; |
469 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
470 | } |
471 | ||
19225135 AC |
472 | static inline int __uart_put_char(struct uart_port *port, |
473 | struct circ_buf *circ, unsigned char c) | |
1da177e4 LT |
474 | { |
475 | unsigned long flags; | |
23d22cea | 476 | int ret = 0; |
1da177e4 LT |
477 | |
478 | if (!circ->buf) | |
23d22cea | 479 | return 0; |
1da177e4 LT |
480 | |
481 | spin_lock_irqsave(&port->lock, flags); | |
482 | if (uart_circ_chars_free(circ) != 0) { | |
483 | circ->buf[circ->head] = c; | |
484 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); | |
23d22cea | 485 | ret = 1; |
1da177e4 LT |
486 | } |
487 | spin_unlock_irqrestore(&port->lock, flags); | |
23d22cea | 488 | return ret; |
1da177e4 LT |
489 | } |
490 | ||
23d22cea | 491 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
492 | { |
493 | struct uart_state *state = tty->driver_data; | |
494 | ||
ebd2c8f6 | 495 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
1da177e4 LT |
496 | } |
497 | ||
498 | static void uart_flush_chars(struct tty_struct *tty) | |
499 | { | |
500 | uart_start(tty); | |
501 | } | |
502 | ||
19225135 AC |
503 | static int uart_write(struct tty_struct *tty, |
504 | const unsigned char *buf, int count) | |
1da177e4 LT |
505 | { |
506 | struct uart_state *state = tty->driver_data; | |
d5f735e5 PM |
507 | struct uart_port *port; |
508 | struct circ_buf *circ; | |
1da177e4 LT |
509 | unsigned long flags; |
510 | int c, ret = 0; | |
511 | ||
d5f735e5 PM |
512 | /* |
513 | * This means you called this function _after_ the port was | |
514 | * closed. No cookie for you. | |
515 | */ | |
f751928e | 516 | if (!state) { |
d5f735e5 PM |
517 | WARN_ON(1); |
518 | return -EL3HLT; | |
519 | } | |
520 | ||
ebd2c8f6 AC |
521 | port = state->uart_port; |
522 | circ = &state->xmit; | |
d5f735e5 | 523 | |
1da177e4 LT |
524 | if (!circ->buf) |
525 | return 0; | |
526 | ||
527 | spin_lock_irqsave(&port->lock, flags); | |
528 | while (1) { | |
529 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
530 | if (count < c) | |
531 | c = count; | |
532 | if (c <= 0) | |
533 | break; | |
534 | memcpy(circ->buf + circ->head, buf, c); | |
535 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
536 | buf += c; | |
537 | count -= c; | |
538 | ret += c; | |
539 | } | |
64dbee31 PH |
540 | |
541 | __uart_start(tty); | |
1da177e4 LT |
542 | spin_unlock_irqrestore(&port->lock, flags); |
543 | ||
1da177e4 LT |
544 | return ret; |
545 | } | |
546 | ||
547 | static int uart_write_room(struct tty_struct *tty) | |
548 | { | |
549 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
550 | unsigned long flags; |
551 | int ret; | |
1da177e4 | 552 | |
ebd2c8f6 AC |
553 | spin_lock_irqsave(&state->uart_port->lock, flags); |
554 | ret = uart_circ_chars_free(&state->xmit); | |
555 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 556 | return ret; |
1da177e4 LT |
557 | } |
558 | ||
559 | static int uart_chars_in_buffer(struct tty_struct *tty) | |
560 | { | |
561 | struct uart_state *state = tty->driver_data; | |
f34d7a5b AC |
562 | unsigned long flags; |
563 | int ret; | |
1da177e4 | 564 | |
ebd2c8f6 AC |
565 | spin_lock_irqsave(&state->uart_port->lock, flags); |
566 | ret = uart_circ_chars_pending(&state->xmit); | |
567 | spin_unlock_irqrestore(&state->uart_port->lock, flags); | |
f34d7a5b | 568 | return ret; |
1da177e4 LT |
569 | } |
570 | ||
571 | static void uart_flush_buffer(struct tty_struct *tty) | |
572 | { | |
573 | struct uart_state *state = tty->driver_data; | |
55d7b689 | 574 | struct uart_port *port; |
1da177e4 LT |
575 | unsigned long flags; |
576 | ||
d5f735e5 PM |
577 | /* |
578 | * This means you called this function _after_ the port was | |
579 | * closed. No cookie for you. | |
580 | */ | |
f751928e | 581 | if (!state) { |
d5f735e5 PM |
582 | WARN_ON(1); |
583 | return; | |
584 | } | |
585 | ||
ebd2c8f6 | 586 | port = state->uart_port; |
eb3a1e11 | 587 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
1da177e4 LT |
588 | |
589 | spin_lock_irqsave(&port->lock, flags); | |
ebd2c8f6 | 590 | uart_circ_clear(&state->xmit); |
6bb0e3a5 HS |
591 | if (port->ops->flush_buffer) |
592 | port->ops->flush_buffer(port); | |
1da177e4 LT |
593 | spin_unlock_irqrestore(&port->lock, flags); |
594 | tty_wakeup(tty); | |
595 | } | |
596 | ||
597 | /* | |
598 | * This function is used to send a high-priority XON/XOFF character to | |
599 | * the device | |
600 | */ | |
601 | static void uart_send_xchar(struct tty_struct *tty, char ch) | |
602 | { | |
603 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 604 | struct uart_port *port = state->uart_port; |
1da177e4 LT |
605 | unsigned long flags; |
606 | ||
607 | if (port->ops->send_xchar) | |
608 | port->ops->send_xchar(port, ch); | |
609 | else { | |
c235ccc1 | 610 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 611 | port->x_char = ch; |
c235ccc1 | 612 | if (ch) |
b129a8cc | 613 | port->ops->start_tx(port); |
c235ccc1 | 614 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
615 | } |
616 | } | |
617 | ||
618 | static void uart_throttle(struct tty_struct *tty) | |
619 | { | |
620 | struct uart_state *state = tty->driver_data; | |
9aba8d5b | 621 | struct uart_port *port = state->uart_port; |
91f189de | 622 | upf_t mask = 0; |
1da177e4 LT |
623 | |
624 | if (I_IXOFF(tty)) | |
9aba8d5b RK |
625 | mask |= UPF_SOFT_FLOW; |
626 | if (tty->termios.c_cflag & CRTSCTS) | |
627 | mask |= UPF_HARD_FLOW; | |
628 | ||
629 | if (port->flags & mask) { | |
630 | port->ops->throttle(port); | |
631 | mask &= ~port->flags; | |
632 | } | |
633 | ||
634 | if (mask & UPF_SOFT_FLOW) | |
1da177e4 LT |
635 | uart_send_xchar(tty, STOP_CHAR(tty)); |
636 | ||
9aba8d5b RK |
637 | if (mask & UPF_HARD_FLOW) |
638 | uart_clear_mctrl(port, TIOCM_RTS); | |
1da177e4 LT |
639 | } |
640 | ||
641 | static void uart_unthrottle(struct tty_struct *tty) | |
642 | { | |
643 | struct uart_state *state = tty->driver_data; | |
ebd2c8f6 | 644 | struct uart_port *port = state->uart_port; |
91f189de | 645 | upf_t mask = 0; |
1da177e4 | 646 | |
9aba8d5b RK |
647 | if (I_IXOFF(tty)) |
648 | mask |= UPF_SOFT_FLOW; | |
649 | if (tty->termios.c_cflag & CRTSCTS) | |
650 | mask |= UPF_HARD_FLOW; | |
651 | ||
652 | if (port->flags & mask) { | |
653 | port->ops->unthrottle(port); | |
654 | mask &= ~port->flags; | |
655 | } | |
1da177e4 | 656 | |
fba594a8 PH |
657 | if (mask & UPF_SOFT_FLOW) |
658 | uart_send_xchar(tty, START_CHAR(tty)); | |
1da177e4 | 659 | |
9aba8d5b | 660 | if (mask & UPF_HARD_FLOW) |
1da177e4 LT |
661 | uart_set_mctrl(port, TIOCM_RTS); |
662 | } | |
663 | ||
9f109694 | 664 | static void do_uart_get_info(struct tty_port *port, |
7ba2e769 | 665 | struct serial_struct *retinfo) |
1da177e4 | 666 | { |
9f109694 | 667 | struct uart_state *state = container_of(port, struct uart_state, port); |
a2bceae0 | 668 | struct uart_port *uport = state->uart_port; |
f34d7a5b | 669 | |
37cd0c99 | 670 | memset(retinfo, 0, sizeof(*retinfo)); |
f34d7a5b | 671 | |
7ba2e769 AC |
672 | retinfo->type = uport->type; |
673 | retinfo->line = uport->line; | |
674 | retinfo->port = uport->iobase; | |
1da177e4 | 675 | if (HIGH_BITS_OFFSET) |
7ba2e769 AC |
676 | retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
677 | retinfo->irq = uport->irq; | |
678 | retinfo->flags = uport->flags; | |
679 | retinfo->xmit_fifo_size = uport->fifosize; | |
680 | retinfo->baud_base = uport->uartclk / 16; | |
681 | retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; | |
682 | retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
1da177e4 | 683 | ASYNC_CLOSING_WAIT_NONE : |
4cb0fbfd | 684 | jiffies_to_msecs(port->closing_wait) / 10; |
7ba2e769 AC |
685 | retinfo->custom_divisor = uport->custom_divisor; |
686 | retinfo->hub6 = uport->hub6; | |
687 | retinfo->io_type = uport->iotype; | |
688 | retinfo->iomem_reg_shift = uport->regshift; | |
689 | retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; | |
690 | } | |
691 | ||
9f109694 AC |
692 | static void uart_get_info(struct tty_port *port, |
693 | struct serial_struct *retinfo) | |
7ba2e769 | 694 | { |
7ba2e769 AC |
695 | /* Ensure the state we copy is consistent and no hardware changes |
696 | occur as we go */ | |
697 | mutex_lock(&port->mutex); | |
9f109694 | 698 | do_uart_get_info(port, retinfo); |
a2bceae0 | 699 | mutex_unlock(&port->mutex); |
9f109694 AC |
700 | } |
701 | ||
702 | static int uart_get_info_user(struct tty_port *port, | |
703 | struct serial_struct __user *retinfo) | |
704 | { | |
705 | struct serial_struct tmp; | |
706 | uart_get_info(port, &tmp); | |
f34d7a5b | 707 | |
1da177e4 LT |
708 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
709 | return -EFAULT; | |
710 | return 0; | |
711 | } | |
712 | ||
7ba2e769 AC |
713 | static int uart_set_info(struct tty_struct *tty, struct tty_port *port, |
714 | struct uart_state *state, | |
715 | struct serial_struct *new_info) | |
1da177e4 | 716 | { |
46d57a44 | 717 | struct uart_port *uport = state->uart_port; |
1da177e4 | 718 | unsigned long new_port; |
0077d45e | 719 | unsigned int change_irq, change_port, closing_wait; |
1da177e4 | 720 | unsigned int old_custom_divisor, close_delay; |
0077d45e | 721 | upf_t old_flags, new_flags; |
1da177e4 LT |
722 | int retval = 0; |
723 | ||
7ba2e769 | 724 | new_port = new_info->port; |
1da177e4 | 725 | if (HIGH_BITS_OFFSET) |
7ba2e769 | 726 | new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; |
1da177e4 | 727 | |
7ba2e769 AC |
728 | new_info->irq = irq_canonicalize(new_info->irq); |
729 | close_delay = msecs_to_jiffies(new_info->close_delay * 10); | |
730 | closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? | |
4cb0fbfd | 731 | ASYNC_CLOSING_WAIT_NONE : |
7ba2e769 | 732 | msecs_to_jiffies(new_info->closing_wait * 10); |
1da177e4 | 733 | |
1da177e4 | 734 | |
46d57a44 | 735 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
7ba2e769 | 736 | && new_info->irq != uport->irq; |
1da177e4 LT |
737 | |
738 | /* | |
739 | * Since changing the 'type' of the port changes its resource | |
740 | * allocations, we should treat type changes the same as | |
741 | * IO port changes. | |
742 | */ | |
46d57a44 AC |
743 | change_port = !(uport->flags & UPF_FIXED_PORT) |
744 | && (new_port != uport->iobase || | |
7ba2e769 AC |
745 | (unsigned long)new_info->iomem_base != uport->mapbase || |
746 | new_info->hub6 != uport->hub6 || | |
747 | new_info->io_type != uport->iotype || | |
748 | new_info->iomem_reg_shift != uport->regshift || | |
749 | new_info->type != uport->type); | |
46d57a44 AC |
750 | |
751 | old_flags = uport->flags; | |
7ba2e769 | 752 | new_flags = new_info->flags; |
46d57a44 | 753 | old_custom_divisor = uport->custom_divisor; |
1da177e4 LT |
754 | |
755 | if (!capable(CAP_SYS_ADMIN)) { | |
756 | retval = -EPERM; | |
757 | if (change_irq || change_port || | |
7ba2e769 | 758 | (new_info->baud_base != uport->uartclk / 16) || |
46d57a44 AC |
759 | (close_delay != port->close_delay) || |
760 | (closing_wait != port->closing_wait) || | |
7ba2e769 AC |
761 | (new_info->xmit_fifo_size && |
762 | new_info->xmit_fifo_size != uport->fifosize) || | |
0077d45e | 763 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
1da177e4 | 764 | goto exit; |
46d57a44 | 765 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
0077d45e | 766 | (new_flags & UPF_USR_MASK)); |
7ba2e769 | 767 | uport->custom_divisor = new_info->custom_divisor; |
1da177e4 LT |
768 | goto check_and_exit; |
769 | } | |
770 | ||
771 | /* | |
772 | * Ask the low level driver to verify the settings. | |
773 | */ | |
46d57a44 | 774 | if (uport->ops->verify_port) |
7ba2e769 | 775 | retval = uport->ops->verify_port(uport, new_info); |
1da177e4 | 776 | |
7ba2e769 AC |
777 | if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || |
778 | (new_info->baud_base < 9600)) | |
1da177e4 LT |
779 | retval = -EINVAL; |
780 | ||
781 | if (retval) | |
782 | goto exit; | |
783 | ||
784 | if (change_port || change_irq) { | |
785 | retval = -EBUSY; | |
786 | ||
787 | /* | |
788 | * Make sure that we are the sole user of this port. | |
789 | */ | |
b58d13a0 | 790 | if (tty_port_users(port) > 1) |
1da177e4 LT |
791 | goto exit; |
792 | ||
793 | /* | |
794 | * We need to shutdown the serial port at the old | |
795 | * port/type/irq combination. | |
796 | */ | |
19225135 | 797 | uart_shutdown(tty, state); |
1da177e4 LT |
798 | } |
799 | ||
800 | if (change_port) { | |
801 | unsigned long old_iobase, old_mapbase; | |
802 | unsigned int old_type, old_iotype, old_hub6, old_shift; | |
803 | ||
46d57a44 AC |
804 | old_iobase = uport->iobase; |
805 | old_mapbase = uport->mapbase; | |
806 | old_type = uport->type; | |
807 | old_hub6 = uport->hub6; | |
808 | old_iotype = uport->iotype; | |
809 | old_shift = uport->regshift; | |
1da177e4 LT |
810 | |
811 | /* | |
812 | * Free and release old regions | |
813 | */ | |
814 | if (old_type != PORT_UNKNOWN) | |
46d57a44 | 815 | uport->ops->release_port(uport); |
1da177e4 | 816 | |
46d57a44 | 817 | uport->iobase = new_port; |
7ba2e769 AC |
818 | uport->type = new_info->type; |
819 | uport->hub6 = new_info->hub6; | |
820 | uport->iotype = new_info->io_type; | |
821 | uport->regshift = new_info->iomem_reg_shift; | |
822 | uport->mapbase = (unsigned long)new_info->iomem_base; | |
1da177e4 LT |
823 | |
824 | /* | |
825 | * Claim and map the new regions | |
826 | */ | |
46d57a44 AC |
827 | if (uport->type != PORT_UNKNOWN) { |
828 | retval = uport->ops->request_port(uport); | |
1da177e4 LT |
829 | } else { |
830 | /* Always success - Jean II */ | |
831 | retval = 0; | |
832 | } | |
833 | ||
834 | /* | |
835 | * If we fail to request resources for the | |
836 | * new port, try to restore the old settings. | |
837 | */ | |
7deb39ed | 838 | if (retval) { |
46d57a44 AC |
839 | uport->iobase = old_iobase; |
840 | uport->type = old_type; | |
841 | uport->hub6 = old_hub6; | |
842 | uport->iotype = old_iotype; | |
843 | uport->regshift = old_shift; | |
844 | uport->mapbase = old_mapbase; | |
1da177e4 | 845 | |
7deb39ed TP |
846 | if (old_type != PORT_UNKNOWN) { |
847 | retval = uport->ops->request_port(uport); | |
848 | /* | |
849 | * If we failed to restore the old settings, | |
850 | * we fail like this. | |
851 | */ | |
852 | if (retval) | |
853 | uport->type = PORT_UNKNOWN; | |
854 | ||
855 | /* | |
856 | * We failed anyway. | |
857 | */ | |
858 | retval = -EBUSY; | |
859 | } | |
860 | ||
a46c9994 AC |
861 | /* Added to return the correct error -Ram Gupta */ |
862 | goto exit; | |
1da177e4 LT |
863 | } |
864 | } | |
865 | ||
abb4a239 | 866 | if (change_irq) |
7ba2e769 | 867 | uport->irq = new_info->irq; |
46d57a44 | 868 | if (!(uport->flags & UPF_FIXED_PORT)) |
7ba2e769 | 869 | uport->uartclk = new_info->baud_base * 16; |
46d57a44 | 870 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
0077d45e | 871 | (new_flags & UPF_CHANGE_MASK); |
7ba2e769 | 872 | uport->custom_divisor = new_info->custom_divisor; |
46d57a44 AC |
873 | port->close_delay = close_delay; |
874 | port->closing_wait = closing_wait; | |
7ba2e769 AC |
875 | if (new_info->xmit_fifo_size) |
876 | uport->fifosize = new_info->xmit_fifo_size; | |
d6c53c0e | 877 | port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
878 | |
879 | check_and_exit: | |
880 | retval = 0; | |
46d57a44 | 881 | if (uport->type == PORT_UNKNOWN) |
1da177e4 | 882 | goto exit; |
ccce6deb | 883 | if (port->flags & ASYNC_INITIALIZED) { |
46d57a44 AC |
884 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
885 | old_custom_divisor != uport->custom_divisor) { | |
1da177e4 LT |
886 | /* |
887 | * If they're setting up a custom divisor or speed, | |
888 | * instead of clearing it, then bitch about it. No | |
889 | * need to rate-limit; it's CAP_SYS_ADMIN only. | |
890 | */ | |
46d57a44 | 891 | if (uport->flags & UPF_SPD_MASK) { |
1da177e4 | 892 | char buf[64]; |
2f2dafe7 SM |
893 | |
894 | dev_notice(uport->dev, | |
895 | "%s sets custom speed on %s. This is deprecated.\n", | |
896 | current->comm, | |
897 | tty_name(port->tty, buf)); | |
1da177e4 | 898 | } |
19225135 | 899 | uart_change_speed(tty, state, NULL); |
1da177e4 LT |
900 | } |
901 | } else | |
19225135 | 902 | retval = uart_startup(tty, state, 1); |
1da177e4 | 903 | exit: |
7ba2e769 AC |
904 | return retval; |
905 | } | |
906 | ||
907 | static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, | |
908 | struct serial_struct __user *newinfo) | |
909 | { | |
910 | struct serial_struct new_serial; | |
911 | struct tty_port *port = &state->port; | |
912 | int retval; | |
913 | ||
914 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) | |
915 | return -EFAULT; | |
916 | ||
917 | /* | |
918 | * This semaphore protects port->count. It is also | |
919 | * very useful to prevent opens. Also, take the | |
920 | * port configuration semaphore to make sure that a | |
921 | * module insertion/removal doesn't change anything | |
922 | * under us. | |
923 | */ | |
924 | mutex_lock(&port->mutex); | |
925 | retval = uart_set_info(tty, port, state, &new_serial); | |
a2bceae0 | 926 | mutex_unlock(&port->mutex); |
1da177e4 LT |
927 | return retval; |
928 | } | |
929 | ||
19225135 AC |
930 | /** |
931 | * uart_get_lsr_info - get line status register info | |
932 | * @tty: tty associated with the UART | |
933 | * @state: UART being queried | |
934 | * @value: returned modem value | |
935 | * | |
936 | * Note: uart_ioctl protects us against hangups. | |
1da177e4 | 937 | */ |
19225135 AC |
938 | static int uart_get_lsr_info(struct tty_struct *tty, |
939 | struct uart_state *state, unsigned int __user *value) | |
1da177e4 | 940 | { |
46d57a44 | 941 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
942 | unsigned int result; |
943 | ||
46d57a44 | 944 | result = uport->ops->tx_empty(uport); |
1da177e4 LT |
945 | |
946 | /* | |
947 | * If we're about to load something into the transmit | |
948 | * register, we'll pretend the transmitter isn't empty to | |
949 | * avoid a race condition (depending on when the transmit | |
950 | * interrupt happens). | |
951 | */ | |
46d57a44 | 952 | if (uport->x_char || |
ebd2c8f6 | 953 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
d01f4d18 | 954 | !uart_tx_stopped(uport))) |
1da177e4 | 955 | result &= ~TIOCSER_TEMT; |
a46c9994 | 956 | |
1da177e4 LT |
957 | return put_user(result, value); |
958 | } | |
959 | ||
60b33c13 | 960 | static int uart_tiocmget(struct tty_struct *tty) |
1da177e4 LT |
961 | { |
962 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 963 | struct tty_port *port = &state->port; |
46d57a44 | 964 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
965 | int result = -EIO; |
966 | ||
a2bceae0 | 967 | mutex_lock(&port->mutex); |
60b33c13 | 968 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 969 | result = uport->mctrl; |
46d57a44 AC |
970 | spin_lock_irq(&uport->lock); |
971 | result |= uport->ops->get_mctrl(uport); | |
972 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 973 | } |
a2bceae0 | 974 | mutex_unlock(&port->mutex); |
1da177e4 LT |
975 | |
976 | return result; | |
977 | } | |
978 | ||
979 | static int | |
20b9d177 | 980 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
1da177e4 LT |
981 | { |
982 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 983 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 984 | struct tty_port *port = &state->port; |
1da177e4 LT |
985 | int ret = -EIO; |
986 | ||
a2bceae0 | 987 | mutex_lock(&port->mutex); |
20b9d177 | 988 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
46d57a44 | 989 | uart_update_mctrl(uport, set, clear); |
1da177e4 LT |
990 | ret = 0; |
991 | } | |
a2bceae0 | 992 | mutex_unlock(&port->mutex); |
1da177e4 LT |
993 | return ret; |
994 | } | |
995 | ||
9e98966c | 996 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 LT |
997 | { |
998 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 999 | struct tty_port *port = &state->port; |
46d57a44 | 1000 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1001 | |
a2bceae0 | 1002 | mutex_lock(&port->mutex); |
1da177e4 | 1003 | |
46d57a44 AC |
1004 | if (uport->type != PORT_UNKNOWN) |
1005 | uport->ops->break_ctl(uport, break_state); | |
1da177e4 | 1006 | |
a2bceae0 | 1007 | mutex_unlock(&port->mutex); |
9e98966c | 1008 | return 0; |
1da177e4 LT |
1009 | } |
1010 | ||
19225135 | 1011 | static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) |
1da177e4 | 1012 | { |
46d57a44 | 1013 | struct uart_port *uport = state->uart_port; |
a2bceae0 | 1014 | struct tty_port *port = &state->port; |
1da177e4 LT |
1015 | int flags, ret; |
1016 | ||
1017 | if (!capable(CAP_SYS_ADMIN)) | |
1018 | return -EPERM; | |
1019 | ||
1020 | /* | |
1021 | * Take the per-port semaphore. This prevents count from | |
1022 | * changing, and hence any extra opens of the port while | |
1023 | * we're auto-configuring. | |
1024 | */ | |
a2bceae0 | 1025 | if (mutex_lock_interruptible(&port->mutex)) |
1da177e4 LT |
1026 | return -ERESTARTSYS; |
1027 | ||
1028 | ret = -EBUSY; | |
b58d13a0 | 1029 | if (tty_port_users(port) == 1) { |
19225135 | 1030 | uart_shutdown(tty, state); |
1da177e4 LT |
1031 | |
1032 | /* | |
1033 | * If we already have a port type configured, | |
1034 | * we must release its resources. | |
1035 | */ | |
46d57a44 AC |
1036 | if (uport->type != PORT_UNKNOWN) |
1037 | uport->ops->release_port(uport); | |
1da177e4 LT |
1038 | |
1039 | flags = UART_CONFIG_TYPE; | |
46d57a44 | 1040 | if (uport->flags & UPF_AUTO_IRQ) |
1da177e4 LT |
1041 | flags |= UART_CONFIG_IRQ; |
1042 | ||
1043 | /* | |
1044 | * This will claim the ports resources if | |
1045 | * a port is found. | |
1046 | */ | |
46d57a44 | 1047 | uport->ops->config_port(uport, flags); |
1da177e4 | 1048 | |
19225135 | 1049 | ret = uart_startup(tty, state, 1); |
1da177e4 | 1050 | } |
a2bceae0 | 1051 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1052 | return ret; |
1053 | } | |
1054 | ||
1fdc3106 AS |
1055 | static void uart_enable_ms(struct uart_port *uport) |
1056 | { | |
1057 | /* | |
1058 | * Force modem status interrupts on | |
1059 | */ | |
1060 | if (uport->ops->enable_ms) | |
1061 | uport->ops->enable_ms(uport); | |
1062 | } | |
1063 | ||
1da177e4 LT |
1064 | /* |
1065 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1066 | * - mask passed in arg for lines of interest | |
1067 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1068 | * Caller should use TIOCGICOUNT to see which one it was | |
bdc04e31 AC |
1069 | * |
1070 | * FIXME: This wants extracting into a common all driver implementation | |
1071 | * of TIOCMWAIT using tty_port. | |
1da177e4 LT |
1072 | */ |
1073 | static int | |
1074 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) | |
1075 | { | |
46d57a44 | 1076 | struct uart_port *uport = state->uart_port; |
bdc04e31 | 1077 | struct tty_port *port = &state->port; |
1da177e4 LT |
1078 | DECLARE_WAITQUEUE(wait, current); |
1079 | struct uart_icount cprev, cnow; | |
1080 | int ret; | |
1081 | ||
1082 | /* | |
1083 | * note the counters on entry | |
1084 | */ | |
46d57a44 AC |
1085 | spin_lock_irq(&uport->lock); |
1086 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); | |
1fdc3106 | 1087 | uart_enable_ms(uport); |
46d57a44 | 1088 | spin_unlock_irq(&uport->lock); |
1da177e4 | 1089 | |
bdc04e31 | 1090 | add_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 | 1091 | for (;;) { |
46d57a44 AC |
1092 | spin_lock_irq(&uport->lock); |
1093 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1094 | spin_unlock_irq(&uport->lock); | |
1da177e4 LT |
1095 | |
1096 | set_current_state(TASK_INTERRUPTIBLE); | |
1097 | ||
1098 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1099 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1100 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1101 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
a46c9994 AC |
1102 | ret = 0; |
1103 | break; | |
1da177e4 LT |
1104 | } |
1105 | ||
1106 | schedule(); | |
1107 | ||
1108 | /* see if a signal did it */ | |
1109 | if (signal_pending(current)) { | |
1110 | ret = -ERESTARTSYS; | |
1111 | break; | |
1112 | } | |
1113 | ||
1114 | cprev = cnow; | |
1115 | } | |
1116 | ||
1117 | current->state = TASK_RUNNING; | |
bdc04e31 | 1118 | remove_wait_queue(&port->delta_msr_wait, &wait); |
1da177e4 LT |
1119 | |
1120 | return ret; | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1125 | * Return: write counters to the user passed counter struct | |
1126 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1127 | * RI where only 0->1 is counted. | |
1128 | */ | |
d281da7f AC |
1129 | static int uart_get_icount(struct tty_struct *tty, |
1130 | struct serial_icounter_struct *icount) | |
1da177e4 | 1131 | { |
d281da7f | 1132 | struct uart_state *state = tty->driver_data; |
1da177e4 | 1133 | struct uart_icount cnow; |
46d57a44 | 1134 | struct uart_port *uport = state->uart_port; |
1da177e4 | 1135 | |
46d57a44 AC |
1136 | spin_lock_irq(&uport->lock); |
1137 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); | |
1138 | spin_unlock_irq(&uport->lock); | |
1da177e4 | 1139 | |
d281da7f AC |
1140 | icount->cts = cnow.cts; |
1141 | icount->dsr = cnow.dsr; | |
1142 | icount->rng = cnow.rng; | |
1143 | icount->dcd = cnow.dcd; | |
1144 | icount->rx = cnow.rx; | |
1145 | icount->tx = cnow.tx; | |
1146 | icount->frame = cnow.frame; | |
1147 | icount->overrun = cnow.overrun; | |
1148 | icount->parity = cnow.parity; | |
1149 | icount->brk = cnow.brk; | |
1150 | icount->buf_overrun = cnow.buf_overrun; | |
1151 | ||
1152 | return 0; | |
1da177e4 LT |
1153 | } |
1154 | ||
a5f276f1 RRD |
1155 | static int uart_get_rs485_config(struct uart_port *port, |
1156 | struct serial_rs485 __user *rs485) | |
1157 | { | |
1158 | if (!port->rs485_config) | |
1159 | return -ENOIOCTLCMD; | |
1160 | ||
1161 | if (copy_to_user(rs485, &port->rs485, sizeof(port->rs485))) | |
1162 | return -EFAULT; | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | static int uart_set_rs485_config(struct uart_port *port, | |
1167 | struct serial_rs485 __user *rs485_user) | |
1168 | { | |
1169 | struct serial_rs485 rs485; | |
1170 | int ret; | |
1171 | ||
1172 | if (!port->rs485_config) | |
1173 | return -ENOIOCTLCMD; | |
1174 | ||
1175 | if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) | |
1176 | return -EFAULT; | |
1177 | ||
1178 | ret = port->rs485_config(port, &rs485); | |
1179 | if (ret) | |
1180 | return ret; | |
1181 | ||
1182 | if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) | |
1183 | return -EFAULT; | |
1184 | ||
1185 | return 0; | |
1186 | } | |
1187 | ||
1da177e4 | 1188 | /* |
e5238442 | 1189 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
1da177e4 LT |
1190 | */ |
1191 | static int | |
6caa76b7 | 1192 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, |
1da177e4 LT |
1193 | unsigned long arg) |
1194 | { | |
1195 | struct uart_state *state = tty->driver_data; | |
a2bceae0 | 1196 | struct tty_port *port = &state->port; |
1da177e4 LT |
1197 | void __user *uarg = (void __user *)arg; |
1198 | int ret = -ENOIOCTLCMD; | |
1199 | ||
1da177e4 LT |
1200 | |
1201 | /* | |
1202 | * These ioctls don't rely on the hardware to be present. | |
1203 | */ | |
1204 | switch (cmd) { | |
1205 | case TIOCGSERIAL: | |
9f109694 | 1206 | ret = uart_get_info_user(port, uarg); |
1da177e4 LT |
1207 | break; |
1208 | ||
1209 | case TIOCSSERIAL: | |
7c8ab967 | 1210 | down_write(&tty->termios_rwsem); |
7ba2e769 | 1211 | ret = uart_set_info_user(tty, state, uarg); |
7c8ab967 | 1212 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
1213 | break; |
1214 | ||
1215 | case TIOCSERCONFIG: | |
7c8ab967 | 1216 | down_write(&tty->termios_rwsem); |
19225135 | 1217 | ret = uart_do_autoconfig(tty, state); |
7c8ab967 | 1218 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
1219 | break; |
1220 | ||
1221 | case TIOCSERGWILD: /* obsolete */ | |
1222 | case TIOCSERSWILD: /* obsolete */ | |
1223 | ret = 0; | |
1224 | break; | |
1225 | } | |
1226 | ||
1227 | if (ret != -ENOIOCTLCMD) | |
1228 | goto out; | |
1229 | ||
1230 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1231 | ret = -EIO; | |
1232 | goto out; | |
1233 | } | |
1234 | ||
1235 | /* | |
1236 | * The following should only be used when hardware is present. | |
1237 | */ | |
1238 | switch (cmd) { | |
1239 | case TIOCMIWAIT: | |
1240 | ret = uart_wait_modem_status(state, arg); | |
1241 | break; | |
1da177e4 LT |
1242 | } |
1243 | ||
1244 | if (ret != -ENOIOCTLCMD) | |
1245 | goto out; | |
1246 | ||
a2bceae0 | 1247 | mutex_lock(&port->mutex); |
1da177e4 | 1248 | |
6caa76b7 | 1249 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
1da177e4 LT |
1250 | ret = -EIO; |
1251 | goto out_up; | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * All these rely on hardware being present and need to be | |
1256 | * protected against the tty being hung up. | |
1257 | */ | |
1258 | switch (cmd) { | |
a5f276f1 RRD |
1259 | case TIOCGRS485: |
1260 | ret = uart_get_rs485_config(state->uart_port, uarg); | |
1261 | break; | |
1262 | ||
1263 | case TIOCSRS485: | |
1264 | ret = uart_set_rs485_config(state->uart_port, uarg); | |
1265 | break; | |
1266 | } | |
1267 | if (ret != -ENOIOCTLCMD) | |
1268 | goto out; | |
1269 | ||
1270 | switch (cmd) { | |
1da177e4 | 1271 | case TIOCSERGETLSR: /* Get line status register */ |
19225135 | 1272 | ret = uart_get_lsr_info(tty, state, uarg); |
1da177e4 LT |
1273 | break; |
1274 | ||
1275 | default: { | |
46d57a44 AC |
1276 | struct uart_port *uport = state->uart_port; |
1277 | if (uport->ops->ioctl) | |
1278 | ret = uport->ops->ioctl(uport, cmd, arg); | |
1da177e4 LT |
1279 | break; |
1280 | } | |
1281 | } | |
f34d7a5b | 1282 | out_up: |
a2bceae0 | 1283 | mutex_unlock(&port->mutex); |
f34d7a5b | 1284 | out: |
1da177e4 LT |
1285 | return ret; |
1286 | } | |
1287 | ||
edeb280e | 1288 | static void uart_set_ldisc(struct tty_struct *tty) |
64e9159f AC |
1289 | { |
1290 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1291 | struct uart_port *uport = state->uart_port; |
64e9159f | 1292 | |
db1b9dfc PH |
1293 | if (uport->ops->set_ldisc) { |
1294 | mutex_lock(&state->port.mutex); | |
732a84a0 | 1295 | uport->ops->set_ldisc(uport, &tty->termios); |
db1b9dfc PH |
1296 | mutex_unlock(&state->port.mutex); |
1297 | } | |
64e9159f AC |
1298 | } |
1299 | ||
a46c9994 AC |
1300 | static void uart_set_termios(struct tty_struct *tty, |
1301 | struct ktermios *old_termios) | |
1da177e4 LT |
1302 | { |
1303 | struct uart_state *state = tty->driver_data; | |
dec94e70 | 1304 | struct uart_port *uport = state->uart_port; |
adc8d746 | 1305 | unsigned int cflag = tty->termios.c_cflag; |
2cbacafd RK |
1306 | unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; |
1307 | bool sw_changed = false; | |
1da177e4 | 1308 | |
2cbacafd RK |
1309 | /* |
1310 | * Drivers doing software flow control also need to know | |
1311 | * about changes to these input settings. | |
1312 | */ | |
1313 | if (uport->flags & UPF_SOFT_FLOW) { | |
1314 | iflag_mask |= IXANY|IXON|IXOFF; | |
1315 | sw_changed = | |
1316 | tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || | |
1317 | tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; | |
1318 | } | |
1da177e4 LT |
1319 | |
1320 | /* | |
1321 | * These are the bits that are used to setup various | |
20620d68 DW |
1322 | * flags in the low level driver. We can ignore the Bfoo |
1323 | * bits in c_cflag; c_[io]speed will always be set | |
1324 | * appropriately by set_termios() in tty_ioctl.c | |
1da177e4 | 1325 | */ |
1da177e4 | 1326 | if ((cflag ^ old_termios->c_cflag) == 0 && |
adc8d746 AC |
1327 | tty->termios.c_ospeed == old_termios->c_ospeed && |
1328 | tty->termios.c_ispeed == old_termios->c_ispeed && | |
2cbacafd RK |
1329 | ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && |
1330 | !sw_changed) { | |
1da177e4 | 1331 | return; |
e5238442 | 1332 | } |
1da177e4 | 1333 | |
7c8ab967 | 1334 | mutex_lock(&state->port.mutex); |
19225135 | 1335 | uart_change_speed(tty, state, old_termios); |
7c8ab967 | 1336 | mutex_unlock(&state->port.mutex); |
c18b55fd PH |
1337 | /* reload cflag from termios; port driver may have overriden flags */ |
1338 | cflag = tty->termios.c_cflag; | |
1da177e4 LT |
1339 | |
1340 | /* Handle transition to B0 status */ | |
1341 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
dec94e70 | 1342 | uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
1da177e4 | 1343 | /* Handle transition away from B0 status */ |
82cb7ba1 | 1344 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 | 1345 | unsigned int mask = TIOCM_DTR; |
99abf3b9 | 1346 | if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) |
1da177e4 | 1347 | mask |= TIOCM_RTS; |
dec94e70 | 1348 | uart_set_mctrl(uport, mask); |
1da177e4 LT |
1349 | } |
1350 | ||
dba05832 RK |
1351 | /* |
1352 | * If the port is doing h/w assisted flow control, do nothing. | |
d01f4d18 | 1353 | * We assume that port->hw_stopped has never been set. |
dba05832 RK |
1354 | */ |
1355 | if (uport->flags & UPF_HARD_FLOW) | |
1356 | return; | |
1357 | ||
1da177e4 LT |
1358 | /* Handle turning off CRTSCTS */ |
1359 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
938f7e13 | 1360 | spin_lock_irq(&uport->lock); |
d01f4d18 | 1361 | uport->hw_stopped = 0; |
1da177e4 | 1362 | __uart_start(tty); |
938f7e13 | 1363 | spin_unlock_irq(&uport->lock); |
1da177e4 | 1364 | } |
0dd7a1ae | 1365 | /* Handle turning on CRTSCTS */ |
82cb7ba1 | 1366 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
938f7e13 | 1367 | spin_lock_irq(&uport->lock); |
dec94e70 | 1368 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { |
d01f4d18 | 1369 | uport->hw_stopped = 1; |
dec94e70 | 1370 | uport->ops->stop_tx(uport); |
0dd7a1ae | 1371 | } |
938f7e13 | 1372 | spin_unlock_irq(&uport->lock); |
0dd7a1ae | 1373 | } |
1da177e4 LT |
1374 | } |
1375 | ||
1376 | /* | |
ef4f527c KC |
1377 | * Calls to uart_close() are serialised via the tty_lock in |
1378 | * drivers/tty/tty_io.c:tty_release() | |
1379 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1380 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1381 | */ |
1382 | static void uart_close(struct tty_struct *tty, struct file *filp) | |
1383 | { | |
1384 | struct uart_state *state = tty->driver_data; | |
46d57a44 AC |
1385 | struct tty_port *port; |
1386 | struct uart_port *uport; | |
61cd8a21 | 1387 | unsigned long flags; |
a46c9994 | 1388 | |
91b32f54 PH |
1389 | if (!state) { |
1390 | struct uart_driver *drv = tty->driver->driver_state; | |
1391 | ||
1392 | state = drv->state + tty->index; | |
1393 | port = &state->port; | |
1394 | spin_lock_irq(&port->lock); | |
1395 | --port->count; | |
1396 | spin_unlock_irq(&port->lock); | |
eea7e17e | 1397 | return; |
91b32f54 | 1398 | } |
eea7e17e | 1399 | |
46d57a44 AC |
1400 | uport = state->uart_port; |
1401 | port = &state->port; | |
1da177e4 | 1402 | |
4ed94cd4 | 1403 | pr_debug("uart_close(%d) called\n", uport ? uport->line : -1); |
1da177e4 | 1404 | |
4ed94cd4 | 1405 | if (!port->count || tty_port_close_start(port, tty, filp) == 0) |
55956216 | 1406 | return; |
1da177e4 LT |
1407 | |
1408 | /* | |
1409 | * At this point, we stop accepting input. To do this, we | |
1410 | * disable the receive line status interrupts. | |
1411 | */ | |
ccce6deb | 1412 | if (port->flags & ASYNC_INITIALIZED) { |
1da177e4 | 1413 | unsigned long flags; |
eea7e17e | 1414 | spin_lock_irqsave(&uport->lock, flags); |
46d57a44 | 1415 | uport->ops->stop_rx(uport); |
eea7e17e | 1416 | spin_unlock_irqrestore(&uport->lock, flags); |
1da177e4 LT |
1417 | /* |
1418 | * Before we drop DTR, make sure the UART transmitter | |
1419 | * has completely drained; this is especially | |
1420 | * important if there is a transmit FIFO! | |
1421 | */ | |
1f33a51d | 1422 | uart_wait_until_sent(tty, uport->timeout); |
1da177e4 LT |
1423 | } |
1424 | ||
bafb0bd2 | 1425 | mutex_lock(&port->mutex); |
19225135 | 1426 | uart_shutdown(tty, state); |
7b01478f | 1427 | tty_port_tty_set(port, NULL); |
61cd8a21 | 1428 | tty->closing = 0; |
ddc7b758 | 1429 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 1430 | |
46d57a44 | 1431 | if (port->blocked_open) { |
61cd8a21 | 1432 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1433 | if (port->close_delay) |
74866e75 | 1434 | msleep_interruptible(jiffies_to_msecs(port->close_delay)); |
61cd8a21 | 1435 | spin_lock_irqsave(&port->lock, flags); |
46d57a44 | 1436 | } else if (!uart_console(uport)) { |
61cd8a21 | 1437 | spin_unlock_irqrestore(&port->lock, flags); |
6f538fe3 | 1438 | uart_change_pm(state, UART_PM_STATE_OFF); |
61cd8a21 | 1439 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1440 | } |
1441 | ||
1442 | /* | |
1443 | * Wake up anyone trying to open this port. | |
1444 | */ | |
ccce6deb | 1445 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
426929f8 | 1446 | clear_bit(ASYNCB_CLOSING, &port->flags); |
61cd8a21 | 1447 | spin_unlock_irqrestore(&port->lock, flags); |
46d57a44 | 1448 | wake_up_interruptible(&port->open_wait); |
426929f8 | 1449 | wake_up_interruptible(&port->close_wait); |
1da177e4 | 1450 | |
a2bceae0 | 1451 | mutex_unlock(&port->mutex); |
2e758910 PH |
1452 | |
1453 | tty_ldisc_flush(tty); | |
1da177e4 LT |
1454 | } |
1455 | ||
1f33a51d | 1456 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
1da177e4 | 1457 | { |
1f33a51d JS |
1458 | struct uart_state *state = tty->driver_data; |
1459 | struct uart_port *port = state->uart_port; | |
1da177e4 LT |
1460 | unsigned long char_time, expire; |
1461 | ||
1da177e4 LT |
1462 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
1463 | return; | |
1464 | ||
1465 | /* | |
1466 | * Set the check interval to be 1/5 of the estimated time to | |
1467 | * send a single character, and make it at least 1. The check | |
1468 | * interval should also be less than the timeout. | |
1469 | * | |
1470 | * Note: we have to use pretty tight timings here to satisfy | |
1471 | * the NIST-PCTS. | |
1472 | */ | |
1473 | char_time = (port->timeout - HZ/50) / port->fifosize; | |
1474 | char_time = char_time / 5; | |
1475 | if (char_time == 0) | |
1476 | char_time = 1; | |
1477 | if (timeout && timeout < char_time) | |
1478 | char_time = timeout; | |
1479 | ||
1480 | /* | |
1481 | * If the transmitter hasn't cleared in twice the approximate | |
1482 | * amount of time to send the entire FIFO, it probably won't | |
1483 | * ever clear. This assumes the UART isn't doing flow | |
1484 | * control, which is currently the case. Hence, if it ever | |
1485 | * takes longer than port->timeout, this is probably due to a | |
1486 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1487 | * 2*port->timeout. | |
1488 | */ | |
1489 | if (timeout == 0 || timeout > 2 * port->timeout) | |
1490 | timeout = 2 * port->timeout; | |
1491 | ||
1492 | expire = jiffies + timeout; | |
1493 | ||
eb3a1e11 | 1494 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
a46c9994 | 1495 | port->line, jiffies, expire); |
1da177e4 LT |
1496 | |
1497 | /* | |
1498 | * Check whether the transmitter is empty every 'char_time'. | |
1499 | * 'timeout' / 'expire' give us the maximum amount of time | |
1500 | * we wait. | |
1501 | */ | |
1502 | while (!port->ops->tx_empty(port)) { | |
1503 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1504 | if (signal_pending(current)) | |
1505 | break; | |
1506 | if (time_after(jiffies, expire)) | |
1507 | break; | |
1508 | } | |
20365219 AB |
1509 | } |
1510 | ||
1da177e4 | 1511 | /* |
ef4f527c KC |
1512 | * Calls to uart_hangup() are serialised by the tty_lock in |
1513 | * drivers/tty/tty_io.c:do_tty_hangup() | |
1514 | * This runs from a workqueue and can sleep for a _short_ time only. | |
1da177e4 LT |
1515 | */ |
1516 | static void uart_hangup(struct tty_struct *tty) | |
1517 | { | |
1518 | struct uart_state *state = tty->driver_data; | |
46d57a44 | 1519 | struct tty_port *port = &state->port; |
61cd8a21 | 1520 | unsigned long flags; |
1da177e4 | 1521 | |
ebd2c8f6 | 1522 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
1da177e4 | 1523 | |
a2bceae0 | 1524 | mutex_lock(&port->mutex); |
ccce6deb | 1525 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
1da177e4 | 1526 | uart_flush_buffer(tty); |
19225135 | 1527 | uart_shutdown(tty, state); |
61cd8a21 | 1528 | spin_lock_irqsave(&port->lock, flags); |
91312cdb | 1529 | port->count = 0; |
ccce6deb | 1530 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
61cd8a21 | 1531 | spin_unlock_irqrestore(&port->lock, flags); |
7b01478f | 1532 | tty_port_tty_set(port, NULL); |
bf903c0c GU |
1533 | if (!uart_console(state->uart_port)) |
1534 | uart_change_pm(state, UART_PM_STATE_OFF); | |
46d57a44 | 1535 | wake_up_interruptible(&port->open_wait); |
bdc04e31 | 1536 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 | 1537 | } |
a2bceae0 | 1538 | mutex_unlock(&port->mutex); |
1da177e4 LT |
1539 | } |
1540 | ||
0b1db830 JS |
1541 | static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) |
1542 | { | |
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static void uart_port_shutdown(struct tty_port *port) | |
1547 | { | |
b922e19d JS |
1548 | struct uart_state *state = container_of(port, struct uart_state, port); |
1549 | struct uart_port *uport = state->uart_port; | |
1550 | ||
1551 | /* | |
1552 | * clear delta_msr_wait queue to avoid mem leaks: we may free | |
1553 | * the irq here so the queue might never be woken up. Note | |
1554 | * that we won't end up waiting on delta_msr_wait again since | |
1555 | * any outstanding file descriptors should be pointing at | |
1556 | * hung_up_tty_fops now. | |
1557 | */ | |
1558 | wake_up_interruptible(&port->delta_msr_wait); | |
1559 | ||
1560 | /* | |
1561 | * Free the IRQ and disable the port. | |
1562 | */ | |
1563 | uport->ops->shutdown(uport); | |
1564 | ||
1565 | /* | |
1566 | * Ensure that the IRQ handler isn't running on another CPU. | |
1567 | */ | |
1568 | synchronize_irq(uport->irq); | |
0b1db830 JS |
1569 | } |
1570 | ||
de0c8cb3 AC |
1571 | static int uart_carrier_raised(struct tty_port *port) |
1572 | { | |
1573 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1574 | struct uart_port *uport = state->uart_port; | |
1575 | int mctrl; | |
de0c8cb3 | 1576 | spin_lock_irq(&uport->lock); |
1fdc3106 | 1577 | uart_enable_ms(uport); |
de0c8cb3 AC |
1578 | mctrl = uport->ops->get_mctrl(uport); |
1579 | spin_unlock_irq(&uport->lock); | |
de0c8cb3 AC |
1580 | if (mctrl & TIOCM_CAR) |
1581 | return 1; | |
1582 | return 0; | |
1583 | } | |
1584 | ||
1585 | static void uart_dtr_rts(struct tty_port *port, int onoff) | |
1586 | { | |
1587 | struct uart_state *state = container_of(port, struct uart_state, port); | |
1588 | struct uart_port *uport = state->uart_port; | |
24fcc7c8 | 1589 | |
6f5c24ad | 1590 | if (onoff) |
de0c8cb3 AC |
1591 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
1592 | else | |
1593 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); | |
de0c8cb3 AC |
1594 | } |
1595 | ||
1da177e4 | 1596 | /* |
ef4f527c KC |
1597 | * Calls to uart_open are serialised by the tty_lock in |
1598 | * drivers/tty/tty_io.c:tty_open() | |
1da177e4 LT |
1599 | * Note that if this fails, then uart_close() _will_ be called. |
1600 | * | |
1601 | * In time, we want to scrap the "opening nonpresent ports" | |
1602 | * behaviour and implement an alternative way for setserial | |
1603 | * to set base addresses/ports/types. This will allow us to | |
1604 | * get rid of a certain amount of extra tests. | |
1605 | */ | |
1606 | static int uart_open(struct tty_struct *tty, struct file *filp) | |
1607 | { | |
1608 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; | |
1da177e4 | 1609 | int retval, line = tty->index; |
1c7b13c4 JS |
1610 | struct uart_state *state = drv->state + line; |
1611 | struct tty_port *port = &state->port; | |
1da177e4 | 1612 | |
eb3a1e11 | 1613 | pr_debug("uart_open(%d) called\n", line); |
1da177e4 | 1614 | |
91b32f54 PH |
1615 | spin_lock_irq(&port->lock); |
1616 | ++port->count; | |
1617 | spin_unlock_irq(&port->lock); | |
1618 | ||
1da177e4 | 1619 | /* |
1c7b13c4 JS |
1620 | * We take the semaphore here to guarantee that we won't be re-entered |
1621 | * while allocating the state structure, or while we request any IRQs | |
1622 | * that the driver may need. This also has the nice side-effect that | |
1623 | * it delays the action of uart_hangup, so we can guarantee that | |
1624 | * state->port.tty will always contain something reasonable. | |
1da177e4 | 1625 | */ |
1c7b13c4 JS |
1626 | if (mutex_lock_interruptible(&port->mutex)) { |
1627 | retval = -ERESTARTSYS; | |
1628 | goto end; | |
1629 | } | |
1630 | ||
1c7b13c4 JS |
1631 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { |
1632 | retval = -ENXIO; | |
91b32f54 | 1633 | goto err_unlock; |
1da177e4 LT |
1634 | } |
1635 | ||
1da177e4 | 1636 | tty->driver_data = state; |
ebd2c8f6 | 1637 | state->uart_port->state = state; |
d6c53c0e JS |
1638 | state->port.low_latency = |
1639 | (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; | |
7b01478f | 1640 | tty_port_tty_set(port, tty); |
1da177e4 | 1641 | |
1da177e4 LT |
1642 | /* |
1643 | * Start up the serial port. | |
1644 | */ | |
19225135 | 1645 | retval = uart_startup(tty, state, 0); |
1da177e4 LT |
1646 | |
1647 | /* | |
1648 | * If we succeeded, wait until the port is ready. | |
1649 | */ | |
61cd8a21 | 1650 | mutex_unlock(&port->mutex); |
1da177e4 | 1651 | if (retval == 0) |
74c21077 | 1652 | retval = tty_port_block_til_ready(port, tty, filp); |
1da177e4 | 1653 | |
1c7b13c4 | 1654 | end: |
1da177e4 | 1655 | return retval; |
91b32f54 | 1656 | err_unlock: |
1c7b13c4 JS |
1657 | mutex_unlock(&port->mutex); |
1658 | goto end; | |
1da177e4 LT |
1659 | } |
1660 | ||
1661 | static const char *uart_type(struct uart_port *port) | |
1662 | { | |
1663 | const char *str = NULL; | |
1664 | ||
1665 | if (port->ops->type) | |
1666 | str = port->ops->type(port); | |
1667 | ||
1668 | if (!str) | |
1669 | str = "unknown"; | |
1670 | ||
1671 | return str; | |
1672 | } | |
1673 | ||
1674 | #ifdef CONFIG_PROC_FS | |
1675 | ||
d196a949 | 1676 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
1da177e4 LT |
1677 | { |
1678 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 1679 | struct tty_port *port = &state->port; |
6f538fe3 | 1680 | enum uart_pm_state pm_state; |
a2bceae0 | 1681 | struct uart_port *uport = state->uart_port; |
1da177e4 LT |
1682 | char stat_buf[32]; |
1683 | unsigned int status; | |
d196a949 | 1684 | int mmio; |
1da177e4 | 1685 | |
a2bceae0 | 1686 | if (!uport) |
d196a949 | 1687 | return; |
1da177e4 | 1688 | |
a2bceae0 | 1689 | mmio = uport->iotype >= UPIO_MEM; |
d196a949 | 1690 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
a2bceae0 | 1691 | uport->line, uart_type(uport), |
6c6a2334 | 1692 | mmio ? "mmio:0x" : "port:", |
a2bceae0 AC |
1693 | mmio ? (unsigned long long)uport->mapbase |
1694 | : (unsigned long long)uport->iobase, | |
1695 | uport->irq); | |
1da177e4 | 1696 | |
a2bceae0 | 1697 | if (uport->type == PORT_UNKNOWN) { |
d196a949 AD |
1698 | seq_putc(m, '\n'); |
1699 | return; | |
1da177e4 LT |
1700 | } |
1701 | ||
a46c9994 | 1702 | if (capable(CAP_SYS_ADMIN)) { |
a2bceae0 | 1703 | mutex_lock(&port->mutex); |
3689a0ec | 1704 | pm_state = state->pm_state; |
6f538fe3 LW |
1705 | if (pm_state != UART_PM_STATE_ON) |
1706 | uart_change_pm(state, UART_PM_STATE_ON); | |
a2bceae0 AC |
1707 | spin_lock_irq(&uport->lock); |
1708 | status = uport->ops->get_mctrl(uport); | |
1709 | spin_unlock_irq(&uport->lock); | |
6f538fe3 | 1710 | if (pm_state != UART_PM_STATE_ON) |
3689a0ec | 1711 | uart_change_pm(state, pm_state); |
a2bceae0 | 1712 | mutex_unlock(&port->mutex); |
1da177e4 | 1713 | |
d196a949 | 1714 | seq_printf(m, " tx:%d rx:%d", |
a2bceae0 AC |
1715 | uport->icount.tx, uport->icount.rx); |
1716 | if (uport->icount.frame) | |
d196a949 | 1717 | seq_printf(m, " fe:%d", |
a2bceae0 AC |
1718 | uport->icount.frame); |
1719 | if (uport->icount.parity) | |
d196a949 | 1720 | seq_printf(m, " pe:%d", |
a2bceae0 AC |
1721 | uport->icount.parity); |
1722 | if (uport->icount.brk) | |
d196a949 | 1723 | seq_printf(m, " brk:%d", |
a2bceae0 AC |
1724 | uport->icount.brk); |
1725 | if (uport->icount.overrun) | |
d196a949 | 1726 | seq_printf(m, " oe:%d", |
a2bceae0 | 1727 | uport->icount.overrun); |
a46c9994 AC |
1728 | |
1729 | #define INFOBIT(bit, str) \ | |
a2bceae0 | 1730 | if (uport->mctrl & (bit)) \ |
1da177e4 LT |
1731 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
1732 | strlen(stat_buf) - 2) | |
a46c9994 | 1733 | #define STATBIT(bit, str) \ |
1da177e4 LT |
1734 | if (status & (bit)) \ |
1735 | strncat(stat_buf, (str), sizeof(stat_buf) - \ | |
1736 | strlen(stat_buf) - 2) | |
1737 | ||
1738 | stat_buf[0] = '\0'; | |
1739 | stat_buf[1] = '\0'; | |
1740 | INFOBIT(TIOCM_RTS, "|RTS"); | |
1741 | STATBIT(TIOCM_CTS, "|CTS"); | |
1742 | INFOBIT(TIOCM_DTR, "|DTR"); | |
1743 | STATBIT(TIOCM_DSR, "|DSR"); | |
1744 | STATBIT(TIOCM_CAR, "|CD"); | |
1745 | STATBIT(TIOCM_RNG, "|RI"); | |
1746 | if (stat_buf[0]) | |
1747 | stat_buf[0] = ' '; | |
a46c9994 | 1748 | |
d196a949 | 1749 | seq_puts(m, stat_buf); |
1da177e4 | 1750 | } |
d196a949 | 1751 | seq_putc(m, '\n'); |
1da177e4 LT |
1752 | #undef STATBIT |
1753 | #undef INFOBIT | |
1da177e4 LT |
1754 | } |
1755 | ||
d196a949 | 1756 | static int uart_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1757 | { |
833bb304 | 1758 | struct tty_driver *ttydrv = m->private; |
1da177e4 | 1759 | struct uart_driver *drv = ttydrv->driver_state; |
d196a949 | 1760 | int i; |
1da177e4 | 1761 | |
d196a949 | 1762 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
1da177e4 | 1763 | "", "", ""); |
d196a949 AD |
1764 | for (i = 0; i < drv->nr; i++) |
1765 | uart_line_info(m, drv, i); | |
1766 | return 0; | |
1da177e4 | 1767 | } |
d196a949 AD |
1768 | |
1769 | static int uart_proc_open(struct inode *inode, struct file *file) | |
1770 | { | |
d9dda78b | 1771 | return single_open(file, uart_proc_show, PDE_DATA(inode)); |
d196a949 AD |
1772 | } |
1773 | ||
1774 | static const struct file_operations uart_proc_fops = { | |
1775 | .owner = THIS_MODULE, | |
1776 | .open = uart_proc_open, | |
1777 | .read = seq_read, | |
1778 | .llseek = seq_lseek, | |
1779 | .release = single_release, | |
1780 | }; | |
1da177e4 LT |
1781 | #endif |
1782 | ||
4a1b5502 | 1783 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
d358788f RK |
1784 | /* |
1785 | * uart_console_write - write a console message to a serial port | |
1786 | * @port: the port to write the message | |
1787 | * @s: array of characters | |
1788 | * @count: number of characters in string to write | |
1789 | * @write: function to write character to port | |
1790 | */ | |
1791 | void uart_console_write(struct uart_port *port, const char *s, | |
1792 | unsigned int count, | |
1793 | void (*putchar)(struct uart_port *, int)) | |
1794 | { | |
1795 | unsigned int i; | |
1796 | ||
1797 | for (i = 0; i < count; i++, s++) { | |
1798 | if (*s == '\n') | |
1799 | putchar(port, '\r'); | |
1800 | putchar(port, *s); | |
1801 | } | |
1802 | } | |
1803 | EXPORT_SYMBOL_GPL(uart_console_write); | |
1804 | ||
1da177e4 LT |
1805 | /* |
1806 | * Check whether an invalid uart number has been specified, and | |
1807 | * if so, search for the first available port that does have | |
1808 | * console support. | |
1809 | */ | |
1810 | struct uart_port * __init | |
1811 | uart_get_console(struct uart_port *ports, int nr, struct console *co) | |
1812 | { | |
1813 | int idx = co->index; | |
1814 | ||
1815 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && | |
1816 | ports[idx].membase == NULL)) | |
1817 | for (idx = 0; idx < nr; idx++) | |
1818 | if (ports[idx].iobase != 0 || | |
1819 | ports[idx].membase != NULL) | |
1820 | break; | |
1821 | ||
1822 | co->index = idx; | |
1823 | ||
1824 | return ports + idx; | |
1825 | } | |
1826 | ||
1827 | /** | |
02088ca6 | 1828 | * uart_parse_options - Parse serial port baud/parity/bits/flow control. |
1da177e4 LT |
1829 | * @options: pointer to option string |
1830 | * @baud: pointer to an 'int' variable for the baud rate. | |
1831 | * @parity: pointer to an 'int' variable for the parity. | |
1832 | * @bits: pointer to an 'int' variable for the number of data bits. | |
1833 | * @flow: pointer to an 'int' variable for the flow control character. | |
1834 | * | |
1835 | * uart_parse_options decodes a string containing the serial console | |
1836 | * options. The format of the string is <baud><parity><bits><flow>, | |
1837 | * eg: 115200n8r | |
1838 | */ | |
f2d937f3 | 1839 | void |
1da177e4 LT |
1840 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
1841 | { | |
1842 | char *s = options; | |
1843 | ||
1844 | *baud = simple_strtoul(s, NULL, 10); | |
1845 | while (*s >= '0' && *s <= '9') | |
1846 | s++; | |
1847 | if (*s) | |
1848 | *parity = *s++; | |
1849 | if (*s) | |
1850 | *bits = *s++ - '0'; | |
1851 | if (*s) | |
1852 | *flow = *s; | |
1853 | } | |
f2d937f3 | 1854 | EXPORT_SYMBOL_GPL(uart_parse_options); |
1da177e4 LT |
1855 | |
1856 | struct baud_rates { | |
1857 | unsigned int rate; | |
1858 | unsigned int cflag; | |
1859 | }; | |
1860 | ||
cb3592be | 1861 | static const struct baud_rates baud_rates[] = { |
1da177e4 LT |
1862 | { 921600, B921600 }, |
1863 | { 460800, B460800 }, | |
1864 | { 230400, B230400 }, | |
1865 | { 115200, B115200 }, | |
1866 | { 57600, B57600 }, | |
1867 | { 38400, B38400 }, | |
1868 | { 19200, B19200 }, | |
1869 | { 9600, B9600 }, | |
1870 | { 4800, B4800 }, | |
1871 | { 2400, B2400 }, | |
1872 | { 1200, B1200 }, | |
1873 | { 0, B38400 } | |
1874 | }; | |
1875 | ||
1876 | /** | |
1877 | * uart_set_options - setup the serial console parameters | |
1878 | * @port: pointer to the serial ports uart_port structure | |
1879 | * @co: console pointer | |
1880 | * @baud: baud rate | |
1881 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) | |
1882 | * @bits: number of data bits | |
1883 | * @flow: flow control character - 'r' (rts) | |
1884 | */ | |
f2d937f3 | 1885 | int |
1da177e4 LT |
1886 | uart_set_options(struct uart_port *port, struct console *co, |
1887 | int baud, int parity, int bits, int flow) | |
1888 | { | |
606d099c | 1889 | struct ktermios termios; |
149b36ea | 1890 | static struct ktermios dummy; |
1da177e4 LT |
1891 | int i; |
1892 | ||
976ecd12 RK |
1893 | /* |
1894 | * Ensure that the serial console lock is initialised | |
1895 | * early. | |
42b6a1ba RW |
1896 | * If this port is a console, then the spinlock is already |
1897 | * initialised. | |
976ecd12 | 1898 | */ |
42b6a1ba RW |
1899 | if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { |
1900 | spin_lock_init(&port->lock); | |
1901 | lockdep_set_class(&port->lock, &port_lock_key); | |
1902 | } | |
976ecd12 | 1903 | |
606d099c | 1904 | memset(&termios, 0, sizeof(struct ktermios)); |
1da177e4 LT |
1905 | |
1906 | termios.c_cflag = CREAD | HUPCL | CLOCAL; | |
1907 | ||
1908 | /* | |
1909 | * Construct a cflag setting. | |
1910 | */ | |
1911 | for (i = 0; baud_rates[i].rate; i++) | |
1912 | if (baud_rates[i].rate <= baud) | |
1913 | break; | |
1914 | ||
1915 | termios.c_cflag |= baud_rates[i].cflag; | |
1916 | ||
1917 | if (bits == 7) | |
1918 | termios.c_cflag |= CS7; | |
1919 | else | |
1920 | termios.c_cflag |= CS8; | |
1921 | ||
1922 | switch (parity) { | |
1923 | case 'o': case 'O': | |
1924 | termios.c_cflag |= PARODD; | |
1925 | /*fall through*/ | |
1926 | case 'e': case 'E': | |
1927 | termios.c_cflag |= PARENB; | |
1928 | break; | |
1929 | } | |
1930 | ||
1931 | if (flow == 'r') | |
1932 | termios.c_cflag |= CRTSCTS; | |
1933 | ||
79492689 YL |
1934 | /* |
1935 | * some uarts on other side don't support no flow control. | |
1936 | * So we set * DTR in host uart to make them happy | |
1937 | */ | |
1938 | port->mctrl |= TIOCM_DTR; | |
1939 | ||
149b36ea | 1940 | port->ops->set_termios(port, &termios, &dummy); |
f2d937f3 JW |
1941 | /* |
1942 | * Allow the setting of the UART parameters with a NULL console | |
1943 | * too: | |
1944 | */ | |
1945 | if (co) | |
1946 | co->cflag = termios.c_cflag; | |
1da177e4 LT |
1947 | |
1948 | return 0; | |
1949 | } | |
f2d937f3 | 1950 | EXPORT_SYMBOL_GPL(uart_set_options); |
1da177e4 LT |
1951 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
1952 | ||
cf75525f JS |
1953 | /** |
1954 | * uart_change_pm - set power state of the port | |
1955 | * | |
1956 | * @state: port descriptor | |
1957 | * @pm_state: new state | |
1958 | * | |
1959 | * Locking: port->mutex has to be held | |
1960 | */ | |
6f538fe3 LW |
1961 | static void uart_change_pm(struct uart_state *state, |
1962 | enum uart_pm_state pm_state) | |
1da177e4 | 1963 | { |
ebd2c8f6 | 1964 | struct uart_port *port = state->uart_port; |
1281e360 AV |
1965 | |
1966 | if (state->pm_state != pm_state) { | |
1967 | if (port->ops->pm) | |
1968 | port->ops->pm(port, pm_state, state->pm_state); | |
1969 | state->pm_state = pm_state; | |
1970 | } | |
1da177e4 LT |
1971 | } |
1972 | ||
b3b708fa GL |
1973 | struct uart_match { |
1974 | struct uart_port *port; | |
1975 | struct uart_driver *driver; | |
1976 | }; | |
1977 | ||
1978 | static int serial_match_port(struct device *dev, void *data) | |
1979 | { | |
1980 | struct uart_match *match = data; | |
7ca796f4 GL |
1981 | struct tty_driver *tty_drv = match->driver->tty_driver; |
1982 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + | |
1983 | match->port->line; | |
b3b708fa GL |
1984 | |
1985 | return dev->devt == devt; /* Actually, only one tty per port */ | |
1986 | } | |
1987 | ||
ccce6deb | 1988 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 1989 | { |
ccce6deb AC |
1990 | struct uart_state *state = drv->state + uport->line; |
1991 | struct tty_port *port = &state->port; | |
b3b708fa | 1992 | struct device *tty_dev; |
ccce6deb | 1993 | struct uart_match match = {uport, drv}; |
1da177e4 | 1994 | |
a2bceae0 | 1995 | mutex_lock(&port->mutex); |
1da177e4 | 1996 | |
ccce6deb | 1997 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
b3b708fa | 1998 | if (device_may_wakeup(tty_dev)) { |
3f960dbb G |
1999 | if (!enable_irq_wake(uport->irq)) |
2000 | uport->irq_wake = 1; | |
b3b708fa | 2001 | put_device(tty_dev); |
a2bceae0 | 2002 | mutex_unlock(&port->mutex); |
b3b708fa GL |
2003 | return 0; |
2004 | } | |
5a65dcc0 FV |
2005 | put_device(tty_dev); |
2006 | ||
4547be78 SB |
2007 | if (console_suspend_enabled || !uart_console(uport)) |
2008 | uport->suspended = 1; | |
b3b708fa | 2009 | |
ccce6deb AC |
2010 | if (port->flags & ASYNC_INITIALIZED) { |
2011 | const struct uart_ops *ops = uport->ops; | |
c8c6bfa3 | 2012 | int tries; |
1da177e4 | 2013 | |
4547be78 SB |
2014 | if (console_suspend_enabled || !uart_console(uport)) { |
2015 | set_bit(ASYNCB_SUSPENDED, &port->flags); | |
2016 | clear_bit(ASYNCB_INITIALIZED, &port->flags); | |
a6b93a90 | 2017 | |
4547be78 SB |
2018 | spin_lock_irq(&uport->lock); |
2019 | ops->stop_tx(uport); | |
2020 | ops->set_mctrl(uport, 0); | |
2021 | ops->stop_rx(uport); | |
2022 | spin_unlock_irq(&uport->lock); | |
2023 | } | |
1da177e4 LT |
2024 | |
2025 | /* | |
2026 | * Wait for the transmitter to empty. | |
2027 | */ | |
ccce6deb | 2028 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
1da177e4 | 2029 | msleep(10); |
c8c6bfa3 | 2030 | if (!tries) |
2f2dafe7 SM |
2031 | dev_err(uport->dev, "%s%d: Unable to drain transmitter\n", |
2032 | drv->dev_name, | |
2033 | drv->tty_driver->name_base + uport->line); | |
1da177e4 | 2034 | |
4547be78 SB |
2035 | if (console_suspend_enabled || !uart_console(uport)) |
2036 | ops->shutdown(uport); | |
1da177e4 LT |
2037 | } |
2038 | ||
2039 | /* | |
2040 | * Disable the console device before suspending. | |
2041 | */ | |
4547be78 | 2042 | if (console_suspend_enabled && uart_console(uport)) |
ccce6deb | 2043 | console_stop(uport->cons); |
1da177e4 | 2044 | |
4547be78 | 2045 | if (console_suspend_enabled || !uart_console(uport)) |
6f538fe3 | 2046 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 | 2047 | |
a2bceae0 | 2048 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2049 | |
2050 | return 0; | |
2051 | } | |
2052 | ||
ccce6deb | 2053 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2054 | { |
ccce6deb AC |
2055 | struct uart_state *state = drv->state + uport->line; |
2056 | struct tty_port *port = &state->port; | |
03a74dcc | 2057 | struct device *tty_dev; |
ccce6deb | 2058 | struct uart_match match = {uport, drv}; |
ba15ab0e | 2059 | struct ktermios termios; |
1da177e4 | 2060 | |
a2bceae0 | 2061 | mutex_lock(&port->mutex); |
1da177e4 | 2062 | |
ccce6deb AC |
2063 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
2064 | if (!uport->suspended && device_may_wakeup(tty_dev)) { | |
3f960dbb G |
2065 | if (uport->irq_wake) { |
2066 | disable_irq_wake(uport->irq); | |
2067 | uport->irq_wake = 0; | |
2068 | } | |
5a65dcc0 | 2069 | put_device(tty_dev); |
a2bceae0 | 2070 | mutex_unlock(&port->mutex); |
b3b708fa GL |
2071 | return 0; |
2072 | } | |
5a65dcc0 | 2073 | put_device(tty_dev); |
ccce6deb | 2074 | uport->suspended = 0; |
b3b708fa | 2075 | |
1da177e4 LT |
2076 | /* |
2077 | * Re-enable the console device after suspending. | |
2078 | */ | |
5933a161 | 2079 | if (uart_console(uport)) { |
891b9dd1 JW |
2080 | /* |
2081 | * First try to use the console cflag setting. | |
2082 | */ | |
2083 | memset(&termios, 0, sizeof(struct ktermios)); | |
2084 | termios.c_cflag = uport->cons->cflag; | |
2085 | ||
2086 | /* | |
2087 | * If that's unset, use the tty termios setting. | |
2088 | */ | |
adc8d746 AC |
2089 | if (port->tty && termios.c_cflag == 0) |
2090 | termios = port->tty->termios; | |
891b9dd1 | 2091 | |
94abc56f | 2092 | if (console_suspend_enabled) |
6f538fe3 | 2093 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb | 2094 | uport->ops->set_termios(uport, &termios, NULL); |
5933a161 YK |
2095 | if (console_suspend_enabled) |
2096 | console_start(uport->cons); | |
1da177e4 LT |
2097 | } |
2098 | ||
ccce6deb AC |
2099 | if (port->flags & ASYNC_SUSPENDED) { |
2100 | const struct uart_ops *ops = uport->ops; | |
ee31b337 | 2101 | int ret; |
1da177e4 | 2102 | |
6f538fe3 | 2103 | uart_change_pm(state, UART_PM_STATE_ON); |
ccce6deb AC |
2104 | spin_lock_irq(&uport->lock); |
2105 | ops->set_mctrl(uport, 0); | |
2106 | spin_unlock_irq(&uport->lock); | |
4547be78 | 2107 | if (console_suspend_enabled || !uart_console(uport)) { |
19225135 AC |
2108 | /* Protected by port mutex for now */ |
2109 | struct tty_struct *tty = port->tty; | |
4547be78 SB |
2110 | ret = ops->startup(uport); |
2111 | if (ret == 0) { | |
19225135 AC |
2112 | if (tty) |
2113 | uart_change_speed(tty, state, NULL); | |
4547be78 SB |
2114 | spin_lock_irq(&uport->lock); |
2115 | ops->set_mctrl(uport, uport->mctrl); | |
2116 | ops->start_tx(uport); | |
2117 | spin_unlock_irq(&uport->lock); | |
2118 | set_bit(ASYNCB_INITIALIZED, &port->flags); | |
2119 | } else { | |
2120 | /* | |
2121 | * Failed to resume - maybe hardware went away? | |
2122 | * Clear the "initialized" flag so we won't try | |
2123 | * to call the low level drivers shutdown method. | |
2124 | */ | |
19225135 | 2125 | uart_shutdown(tty, state); |
4547be78 | 2126 | } |
ee31b337 | 2127 | } |
a6b93a90 | 2128 | |
ccce6deb | 2129 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
1da177e4 LT |
2130 | } |
2131 | ||
a2bceae0 | 2132 | mutex_unlock(&port->mutex); |
1da177e4 LT |
2133 | |
2134 | return 0; | |
2135 | } | |
2136 | ||
2137 | static inline void | |
2138 | uart_report_port(struct uart_driver *drv, struct uart_port *port) | |
2139 | { | |
30b7a3bc RK |
2140 | char address[64]; |
2141 | ||
1da177e4 LT |
2142 | switch (port->iotype) { |
2143 | case UPIO_PORT: | |
9bde10a4 | 2144 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
1da177e4 LT |
2145 | break; |
2146 | case UPIO_HUB6: | |
30b7a3bc | 2147 | snprintf(address, sizeof(address), |
9bde10a4 | 2148 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
1da177e4 LT |
2149 | break; |
2150 | case UPIO_MEM: | |
2151 | case UPIO_MEM32: | |
21c614a7 | 2152 | case UPIO_AU: |
3be91ec7 | 2153 | case UPIO_TSI: |
30b7a3bc | 2154 | snprintf(address, sizeof(address), |
4f640efb | 2155 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
30b7a3bc RK |
2156 | break; |
2157 | default: | |
2158 | strlcpy(address, "*unknown*", sizeof(address)); | |
1da177e4 LT |
2159 | break; |
2160 | } | |
30b7a3bc | 2161 | |
2f2dafe7 | 2162 | dev_info(port->dev, "%s%d at %s (irq = %d, base_baud = %d) is a %s\n", |
8440838b DM |
2163 | drv->dev_name, |
2164 | drv->tty_driver->name_base + port->line, | |
7d12b976 | 2165 | address, port->irq, port->uartclk / 16, uart_type(port)); |
1da177e4 LT |
2166 | } |
2167 | ||
2168 | static void | |
2169 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, | |
2170 | struct uart_port *port) | |
2171 | { | |
2172 | unsigned int flags; | |
2173 | ||
2174 | /* | |
2175 | * If there isn't a port here, don't do anything further. | |
2176 | */ | |
2177 | if (!port->iobase && !port->mapbase && !port->membase) | |
2178 | return; | |
2179 | ||
2180 | /* | |
2181 | * Now do the auto configuration stuff. Note that config_port | |
2182 | * is expected to claim the resources and map the port for us. | |
2183 | */ | |
8e23fcc8 | 2184 | flags = 0; |
1da177e4 LT |
2185 | if (port->flags & UPF_AUTO_IRQ) |
2186 | flags |= UART_CONFIG_IRQ; | |
2187 | if (port->flags & UPF_BOOT_AUTOCONF) { | |
8e23fcc8 DD |
2188 | if (!(port->flags & UPF_FIXED_TYPE)) { |
2189 | port->type = PORT_UNKNOWN; | |
2190 | flags |= UART_CONFIG_TYPE; | |
2191 | } | |
1da177e4 LT |
2192 | port->ops->config_port(port, flags); |
2193 | } | |
2194 | ||
2195 | if (port->type != PORT_UNKNOWN) { | |
2196 | unsigned long flags; | |
2197 | ||
2198 | uart_report_port(drv, port); | |
2199 | ||
3689a0ec | 2200 | /* Power up port for set_mctrl() */ |
6f538fe3 | 2201 | uart_change_pm(state, UART_PM_STATE_ON); |
3689a0ec | 2202 | |
1da177e4 LT |
2203 | /* |
2204 | * Ensure that the modem control lines are de-activated. | |
c3e4642b | 2205 | * keep the DTR setting that is set in uart_set_options() |
1da177e4 LT |
2206 | * We probably don't need a spinlock around this, but |
2207 | */ | |
2208 | spin_lock_irqsave(&port->lock, flags); | |
c3e4642b | 2209 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
1da177e4 LT |
2210 | spin_unlock_irqrestore(&port->lock, flags); |
2211 | ||
97d97224 RK |
2212 | /* |
2213 | * If this driver supports console, and it hasn't been | |
2214 | * successfully registered yet, try to re-register it. | |
2215 | * It may be that the port was not available. | |
2216 | */ | |
2217 | if (port->cons && !(port->cons->flags & CON_ENABLED)) | |
2218 | register_console(port->cons); | |
2219 | ||
1da177e4 LT |
2220 | /* |
2221 | * Power down all ports by default, except the | |
2222 | * console if we have one. | |
2223 | */ | |
2224 | if (!uart_console(port)) | |
6f538fe3 | 2225 | uart_change_pm(state, UART_PM_STATE_OFF); |
1da177e4 LT |
2226 | } |
2227 | } | |
2228 | ||
f2d937f3 JW |
2229 | #ifdef CONFIG_CONSOLE_POLL |
2230 | ||
2231 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) | |
2232 | { | |
2233 | struct uart_driver *drv = driver->driver_state; | |
2234 | struct uart_state *state = drv->state + line; | |
2235 | struct uart_port *port; | |
2236 | int baud = 9600; | |
2237 | int bits = 8; | |
2238 | int parity = 'n'; | |
2239 | int flow = 'n'; | |
c7f3e708 | 2240 | int ret; |
f2d937f3 | 2241 | |
ebd2c8f6 | 2242 | if (!state || !state->uart_port) |
f2d937f3 JW |
2243 | return -1; |
2244 | ||
ebd2c8f6 | 2245 | port = state->uart_port; |
f2d937f3 JW |
2246 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
2247 | return -1; | |
2248 | ||
c7f3e708 AV |
2249 | if (port->ops->poll_init) { |
2250 | struct tty_port *tport = &state->port; | |
2251 | ||
2252 | ret = 0; | |
2253 | mutex_lock(&tport->mutex); | |
2254 | /* | |
2255 | * We don't set ASYNCB_INITIALIZED as we only initialized the | |
2256 | * hw, e.g. state->xmit is still uninitialized. | |
2257 | */ | |
2258 | if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) | |
2259 | ret = port->ops->poll_init(port); | |
2260 | mutex_unlock(&tport->mutex); | |
2261 | if (ret) | |
2262 | return ret; | |
2263 | } | |
2264 | ||
f2d937f3 JW |
2265 | if (options) { |
2266 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2267 | return uart_set_options(port, NULL, baud, parity, bits, flow); | |
2268 | } | |
2269 | ||
2270 | return 0; | |
2271 | } | |
2272 | ||
2273 | static int uart_poll_get_char(struct tty_driver *driver, int line) | |
2274 | { | |
2275 | struct uart_driver *drv = driver->driver_state; | |
2276 | struct uart_state *state = drv->state + line; | |
2277 | struct uart_port *port; | |
2278 | ||
ebd2c8f6 | 2279 | if (!state || !state->uart_port) |
f2d937f3 JW |
2280 | return -1; |
2281 | ||
ebd2c8f6 | 2282 | port = state->uart_port; |
f2d937f3 JW |
2283 | return port->ops->poll_get_char(port); |
2284 | } | |
2285 | ||
2286 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) | |
2287 | { | |
2288 | struct uart_driver *drv = driver->driver_state; | |
2289 | struct uart_state *state = drv->state + line; | |
2290 | struct uart_port *port; | |
2291 | ||
ebd2c8f6 | 2292 | if (!state || !state->uart_port) |
f2d937f3 JW |
2293 | return; |
2294 | ||
ebd2c8f6 | 2295 | port = state->uart_port; |
c7d44a02 DA |
2296 | |
2297 | if (ch == '\n') | |
2298 | port->ops->poll_put_char(port, '\r'); | |
f2d937f3 JW |
2299 | port->ops->poll_put_char(port, ch); |
2300 | } | |
2301 | #endif | |
2302 | ||
b68e31d0 | 2303 | static const struct tty_operations uart_ops = { |
1da177e4 LT |
2304 | .open = uart_open, |
2305 | .close = uart_close, | |
2306 | .write = uart_write, | |
2307 | .put_char = uart_put_char, | |
2308 | .flush_chars = uart_flush_chars, | |
2309 | .write_room = uart_write_room, | |
2310 | .chars_in_buffer= uart_chars_in_buffer, | |
2311 | .flush_buffer = uart_flush_buffer, | |
2312 | .ioctl = uart_ioctl, | |
2313 | .throttle = uart_throttle, | |
2314 | .unthrottle = uart_unthrottle, | |
2315 | .send_xchar = uart_send_xchar, | |
2316 | .set_termios = uart_set_termios, | |
64e9159f | 2317 | .set_ldisc = uart_set_ldisc, |
1da177e4 LT |
2318 | .stop = uart_stop, |
2319 | .start = uart_start, | |
2320 | .hangup = uart_hangup, | |
2321 | .break_ctl = uart_break_ctl, | |
2322 | .wait_until_sent= uart_wait_until_sent, | |
2323 | #ifdef CONFIG_PROC_FS | |
d196a949 | 2324 | .proc_fops = &uart_proc_fops, |
1da177e4 LT |
2325 | #endif |
2326 | .tiocmget = uart_tiocmget, | |
2327 | .tiocmset = uart_tiocmset, | |
d281da7f | 2328 | .get_icount = uart_get_icount, |
f2d937f3 JW |
2329 | #ifdef CONFIG_CONSOLE_POLL |
2330 | .poll_init = uart_poll_init, | |
2331 | .poll_get_char = uart_poll_get_char, | |
2332 | .poll_put_char = uart_poll_put_char, | |
2333 | #endif | |
1da177e4 LT |
2334 | }; |
2335 | ||
de0c8cb3 | 2336 | static const struct tty_port_operations uart_port_ops = { |
0b1db830 JS |
2337 | .activate = uart_port_activate, |
2338 | .shutdown = uart_port_shutdown, | |
de0c8cb3 AC |
2339 | .carrier_raised = uart_carrier_raised, |
2340 | .dtr_rts = uart_dtr_rts, | |
2341 | }; | |
2342 | ||
1da177e4 LT |
2343 | /** |
2344 | * uart_register_driver - register a driver with the uart core layer | |
2345 | * @drv: low level driver structure | |
2346 | * | |
2347 | * Register a uart driver with the core driver. We in turn register | |
2348 | * with the tty layer, and initialise the core driver per-port state. | |
2349 | * | |
2350 | * We have a proc file in /proc/tty/driver which is named after the | |
2351 | * normal driver. | |
2352 | * | |
2353 | * drv->port should be NULL, and the per-port structures should be | |
2354 | * registered using uart_add_one_port after this call has succeeded. | |
2355 | */ | |
2356 | int uart_register_driver(struct uart_driver *drv) | |
2357 | { | |
9e845abf | 2358 | struct tty_driver *normal; |
1da177e4 LT |
2359 | int i, retval; |
2360 | ||
2361 | BUG_ON(drv->state); | |
2362 | ||
2363 | /* | |
2364 | * Maybe we should be using a slab cache for this, especially if | |
2365 | * we have a large number of ports to handle. | |
2366 | */ | |
8f31bb39 | 2367 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
1da177e4 LT |
2368 | if (!drv->state) |
2369 | goto out; | |
2370 | ||
9e845abf | 2371 | normal = alloc_tty_driver(drv->nr); |
1da177e4 | 2372 | if (!normal) |
9e845abf | 2373 | goto out_kfree; |
1da177e4 LT |
2374 | |
2375 | drv->tty_driver = normal; | |
2376 | ||
1da177e4 | 2377 | normal->driver_name = drv->driver_name; |
1da177e4 LT |
2378 | normal->name = drv->dev_name; |
2379 | normal->major = drv->major; | |
2380 | normal->minor_start = drv->minor; | |
2381 | normal->type = TTY_DRIVER_TYPE_SERIAL; | |
2382 | normal->subtype = SERIAL_TYPE_NORMAL; | |
2383 | normal->init_termios = tty_std_termios; | |
2384 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
606d099c | 2385 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
331b8319 | 2386 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 LT |
2387 | normal->driver_state = drv; |
2388 | tty_set_operations(normal, &uart_ops); | |
2389 | ||
2390 | /* | |
2391 | * Initialise the UART state(s). | |
2392 | */ | |
2393 | for (i = 0; i < drv->nr; i++) { | |
2394 | struct uart_state *state = drv->state + i; | |
a2bceae0 | 2395 | struct tty_port *port = &state->port; |
1da177e4 | 2396 | |
a2bceae0 | 2397 | tty_port_init(port); |
de0c8cb3 | 2398 | port->ops = &uart_port_ops; |
1da177e4 LT |
2399 | } |
2400 | ||
2401 | retval = tty_register_driver(normal); | |
9e845abf AGR |
2402 | if (retval >= 0) |
2403 | return retval; | |
2404 | ||
191c5f10 JS |
2405 | for (i = 0; i < drv->nr; i++) |
2406 | tty_port_destroy(&drv->state[i].port); | |
9e845abf AGR |
2407 | put_tty_driver(normal); |
2408 | out_kfree: | |
2409 | kfree(drv->state); | |
2410 | out: | |
2411 | return -ENOMEM; | |
1da177e4 LT |
2412 | } |
2413 | ||
2414 | /** | |
2415 | * uart_unregister_driver - remove a driver from the uart core layer | |
2416 | * @drv: low level driver structure | |
2417 | * | |
2418 | * Remove all references to a driver from the core driver. The low | |
2419 | * level driver must have removed all its ports via the | |
2420 | * uart_remove_one_port() if it registered them with uart_add_one_port(). | |
2421 | * (ie, drv->port == NULL) | |
2422 | */ | |
2423 | void uart_unregister_driver(struct uart_driver *drv) | |
2424 | { | |
2425 | struct tty_driver *p = drv->tty_driver; | |
191c5f10 JS |
2426 | unsigned int i; |
2427 | ||
1da177e4 LT |
2428 | tty_unregister_driver(p); |
2429 | put_tty_driver(p); | |
191c5f10 JS |
2430 | for (i = 0; i < drv->nr; i++) |
2431 | tty_port_destroy(&drv->state[i].port); | |
1da177e4 | 2432 | kfree(drv->state); |
1e66cded | 2433 | drv->state = NULL; |
1da177e4 LT |
2434 | drv->tty_driver = NULL; |
2435 | } | |
2436 | ||
2437 | struct tty_driver *uart_console_device(struct console *co, int *index) | |
2438 | { | |
2439 | struct uart_driver *p = co->data; | |
2440 | *index = co->index; | |
2441 | return p->tty_driver; | |
2442 | } | |
2443 | ||
6915c0e4 TH |
2444 | static ssize_t uart_get_attr_uartclk(struct device *dev, |
2445 | struct device_attribute *attr, char *buf) | |
2446 | { | |
bebe73e3 | 2447 | struct serial_struct tmp; |
6915c0e4 | 2448 | struct tty_port *port = dev_get_drvdata(dev); |
6915c0e4 | 2449 | |
9f109694 | 2450 | uart_get_info(port, &tmp); |
bebe73e3 | 2451 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); |
6915c0e4 TH |
2452 | } |
2453 | ||
373bac4c AC |
2454 | static ssize_t uart_get_attr_type(struct device *dev, |
2455 | struct device_attribute *attr, char *buf) | |
2456 | { | |
2457 | struct serial_struct tmp; | |
2458 | struct tty_port *port = dev_get_drvdata(dev); | |
2459 | ||
2460 | uart_get_info(port, &tmp); | |
2461 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); | |
2462 | } | |
2463 | static ssize_t uart_get_attr_line(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.line); | |
2471 | } | |
2472 | ||
2473 | static ssize_t uart_get_attr_port(struct device *dev, | |
2474 | struct device_attribute *attr, char *buf) | |
2475 | { | |
2476 | struct serial_struct tmp; | |
2477 | struct tty_port *port = dev_get_drvdata(dev); | |
fd985e1d | 2478 | unsigned long ioaddr; |
373bac4c AC |
2479 | |
2480 | uart_get_info(port, &tmp); | |
fd985e1d AM |
2481 | ioaddr = tmp.port; |
2482 | if (HIGH_BITS_OFFSET) | |
2483 | ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; | |
2484 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); | |
373bac4c AC |
2485 | } |
2486 | ||
2487 | static ssize_t uart_get_attr_irq(struct device *dev, | |
2488 | struct device_attribute *attr, char *buf) | |
2489 | { | |
2490 | struct serial_struct tmp; | |
2491 | struct tty_port *port = dev_get_drvdata(dev); | |
2492 | ||
2493 | uart_get_info(port, &tmp); | |
2494 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); | |
2495 | } | |
2496 | ||
2497 | static ssize_t uart_get_attr_flags(struct device *dev, | |
2498 | struct device_attribute *attr, char *buf) | |
2499 | { | |
2500 | struct serial_struct tmp; | |
2501 | struct tty_port *port = dev_get_drvdata(dev); | |
2502 | ||
2503 | uart_get_info(port, &tmp); | |
2504 | return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); | |
2505 | } | |
2506 | ||
2507 | static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, | |
2508 | struct device_attribute *attr, char *buf) | |
2509 | { | |
2510 | struct serial_struct tmp; | |
2511 | struct tty_port *port = dev_get_drvdata(dev); | |
2512 | ||
2513 | uart_get_info(port, &tmp); | |
2514 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); | |
2515 | } | |
2516 | ||
2517 | ||
2518 | static ssize_t uart_get_attr_close_delay(struct device *dev, | |
2519 | struct device_attribute *attr, char *buf) | |
2520 | { | |
2521 | struct serial_struct tmp; | |
2522 | struct tty_port *port = dev_get_drvdata(dev); | |
2523 | ||
2524 | uart_get_info(port, &tmp); | |
2525 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); | |
2526 | } | |
2527 | ||
2528 | ||
2529 | static ssize_t uart_get_attr_closing_wait(struct device *dev, | |
2530 | struct device_attribute *attr, char *buf) | |
2531 | { | |
2532 | struct serial_struct tmp; | |
2533 | struct tty_port *port = dev_get_drvdata(dev); | |
2534 | ||
2535 | uart_get_info(port, &tmp); | |
2536 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); | |
2537 | } | |
2538 | ||
2539 | static ssize_t uart_get_attr_custom_divisor(struct device *dev, | |
2540 | struct device_attribute *attr, char *buf) | |
2541 | { | |
2542 | struct serial_struct tmp; | |
2543 | struct tty_port *port = dev_get_drvdata(dev); | |
2544 | ||
2545 | uart_get_info(port, &tmp); | |
2546 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); | |
2547 | } | |
2548 | ||
2549 | static ssize_t uart_get_attr_io_type(struct device *dev, | |
2550 | struct device_attribute *attr, char *buf) | |
2551 | { | |
2552 | struct serial_struct tmp; | |
2553 | struct tty_port *port = dev_get_drvdata(dev); | |
2554 | ||
2555 | uart_get_info(port, &tmp); | |
2556 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); | |
2557 | } | |
2558 | ||
2559 | static ssize_t uart_get_attr_iomem_base(struct device *dev, | |
2560 | struct device_attribute *attr, char *buf) | |
2561 | { | |
2562 | struct serial_struct tmp; | |
2563 | struct tty_port *port = dev_get_drvdata(dev); | |
2564 | ||
2565 | uart_get_info(port, &tmp); | |
2566 | return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); | |
2567 | } | |
2568 | ||
2569 | static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, | |
2570 | struct device_attribute *attr, char *buf) | |
2571 | { | |
2572 | struct serial_struct tmp; | |
2573 | struct tty_port *port = dev_get_drvdata(dev); | |
2574 | ||
2575 | uart_get_info(port, &tmp); | |
2576 | return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); | |
2577 | } | |
2578 | ||
2579 | static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); | |
2580 | static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); | |
2581 | static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); | |
2582 | static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); | |
2583 | static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); | |
2584 | static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); | |
6915c0e4 | 2585 | static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); |
373bac4c AC |
2586 | static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); |
2587 | static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); | |
2588 | static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); | |
2589 | static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); | |
2590 | static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); | |
2591 | static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); | |
6915c0e4 TH |
2592 | |
2593 | static struct attribute *tty_dev_attrs[] = { | |
373bac4c AC |
2594 | &dev_attr_type.attr, |
2595 | &dev_attr_line.attr, | |
2596 | &dev_attr_port.attr, | |
2597 | &dev_attr_irq.attr, | |
2598 | &dev_attr_flags.attr, | |
2599 | &dev_attr_xmit_fifo_size.attr, | |
6915c0e4 | 2600 | &dev_attr_uartclk.attr, |
373bac4c AC |
2601 | &dev_attr_close_delay.attr, |
2602 | &dev_attr_closing_wait.attr, | |
2603 | &dev_attr_custom_divisor.attr, | |
2604 | &dev_attr_io_type.attr, | |
2605 | &dev_attr_iomem_base.attr, | |
2606 | &dev_attr_iomem_reg_shift.attr, | |
6915c0e4 TH |
2607 | NULL, |
2608 | }; | |
2609 | ||
b1b79916 | 2610 | static const struct attribute_group tty_dev_attr_group = { |
6915c0e4 TH |
2611 | .attrs = tty_dev_attrs, |
2612 | }; | |
2613 | ||
1da177e4 LT |
2614 | /** |
2615 | * uart_add_one_port - attach a driver-defined port structure | |
2616 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2617 | * @uport: uart port structure to use for this port. |
1da177e4 LT |
2618 | * |
2619 | * This allows the driver to register its own uart_port structure | |
2620 | * with the core driver. The main purpose is to allow the low | |
2621 | * level uart drivers to expand uart_port, rather than having yet | |
2622 | * more levels of structures. | |
2623 | */ | |
a2bceae0 | 2624 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 LT |
2625 | { |
2626 | struct uart_state *state; | |
a2bceae0 | 2627 | struct tty_port *port; |
1da177e4 | 2628 | int ret = 0; |
b3b708fa | 2629 | struct device *tty_dev; |
266dcff0 | 2630 | int num_groups; |
1da177e4 LT |
2631 | |
2632 | BUG_ON(in_interrupt()); | |
2633 | ||
a2bceae0 | 2634 | if (uport->line >= drv->nr) |
1da177e4 LT |
2635 | return -EINVAL; |
2636 | ||
a2bceae0 AC |
2637 | state = drv->state + uport->line; |
2638 | port = &state->port; | |
1da177e4 | 2639 | |
f392ecfa | 2640 | mutex_lock(&port_mutex); |
a2bceae0 | 2641 | mutex_lock(&port->mutex); |
ebd2c8f6 | 2642 | if (state->uart_port) { |
1da177e4 LT |
2643 | ret = -EINVAL; |
2644 | goto out; | |
2645 | } | |
2646 | ||
2b702b9b | 2647 | /* Link the port to the driver state table and vice versa */ |
a2bceae0 | 2648 | state->uart_port = uport; |
2b702b9b | 2649 | uport->state = state; |
1da177e4 | 2650 | |
2b702b9b | 2651 | state->pm_state = UART_PM_STATE_UNDEFINED; |
a2bceae0 | 2652 | uport->cons = drv->cons; |
1da177e4 | 2653 | |
976ecd12 RK |
2654 | /* |
2655 | * If this port is a console, then the spinlock is already | |
2656 | * initialised. | |
2657 | */ | |
a2bceae0 AC |
2658 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
2659 | spin_lock_init(&uport->lock); | |
2660 | lockdep_set_class(&uport->lock, &port_lock_key); | |
13e83599 | 2661 | } |
a208ffd2 GL |
2662 | if (uport->cons && uport->dev) |
2663 | of_console_check(uport->dev->of_node, uport->cons->name, uport->line); | |
976ecd12 | 2664 | |
a2bceae0 | 2665 | uart_configure_port(drv, state, uport); |
1da177e4 | 2666 | |
266dcff0 GKH |
2667 | num_groups = 2; |
2668 | if (uport->attr_group) | |
2669 | num_groups++; | |
2670 | ||
c2b703b8 | 2671 | uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), |
266dcff0 GKH |
2672 | GFP_KERNEL); |
2673 | if (!uport->tty_groups) { | |
2674 | ret = -ENOMEM; | |
2675 | goto out; | |
2676 | } | |
2677 | uport->tty_groups[0] = &tty_dev_attr_group; | |
2678 | if (uport->attr_group) | |
2679 | uport->tty_groups[1] = uport->attr_group; | |
2680 | ||
1da177e4 LT |
2681 | /* |
2682 | * Register the port whether it's detected or not. This allows | |
015355b7 | 2683 | * setserial to be used to alter this port's parameters. |
1da177e4 | 2684 | */ |
b1b79916 | 2685 | tty_dev = tty_port_register_device_attr(port, drv->tty_driver, |
266dcff0 | 2686 | uport->line, uport->dev, port, uport->tty_groups); |
b3b708fa | 2687 | if (likely(!IS_ERR(tty_dev))) { |
77359835 SG |
2688 | device_set_wakeup_capable(tty_dev, 1); |
2689 | } else { | |
2f2dafe7 | 2690 | dev_err(uport->dev, "Cannot register tty device on line %d\n", |
a2bceae0 | 2691 | uport->line); |
77359835 | 2692 | } |
1da177e4 | 2693 | |
68ac64cd RK |
2694 | /* |
2695 | * Ensure UPF_DEAD is not set. | |
2696 | */ | |
a2bceae0 | 2697 | uport->flags &= ~UPF_DEAD; |
68ac64cd | 2698 | |
1da177e4 | 2699 | out: |
a2bceae0 | 2700 | mutex_unlock(&port->mutex); |
f392ecfa | 2701 | mutex_unlock(&port_mutex); |
1da177e4 LT |
2702 | |
2703 | return ret; | |
2704 | } | |
2705 | ||
2706 | /** | |
2707 | * uart_remove_one_port - detach a driver defined port structure | |
2708 | * @drv: pointer to the uart low level driver structure for this port | |
1b9894f3 | 2709 | * @uport: uart port structure for this port |
1da177e4 LT |
2710 | * |
2711 | * This unhooks (and hangs up) the specified port structure from the | |
2712 | * core driver. No further calls will be made to the low-level code | |
2713 | * for this port. | |
2714 | */ | |
a2bceae0 | 2715 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
1da177e4 | 2716 | { |
a2bceae0 AC |
2717 | struct uart_state *state = drv->state + uport->line; |
2718 | struct tty_port *port = &state->port; | |
4c6d5b4d | 2719 | struct tty_struct *tty; |
b342dd51 | 2720 | int ret = 0; |
1da177e4 LT |
2721 | |
2722 | BUG_ON(in_interrupt()); | |
2723 | ||
a2bceae0 | 2724 | if (state->uart_port != uport) |
2f2dafe7 | 2725 | dev_alert(uport->dev, "Removing wrong port: %p != %p\n", |
a2bceae0 | 2726 | state->uart_port, uport); |
1da177e4 | 2727 | |
f392ecfa | 2728 | mutex_lock(&port_mutex); |
1da177e4 | 2729 | |
68ac64cd RK |
2730 | /* |
2731 | * Mark the port "dead" - this prevents any opens from | |
2732 | * succeeding while we shut down the port. | |
2733 | */ | |
a2bceae0 | 2734 | mutex_lock(&port->mutex); |
b342dd51 CG |
2735 | if (!state->uart_port) { |
2736 | mutex_unlock(&port->mutex); | |
2737 | ret = -EINVAL; | |
2738 | goto out; | |
2739 | } | |
a2bceae0 AC |
2740 | uport->flags |= UPF_DEAD; |
2741 | mutex_unlock(&port->mutex); | |
68ac64cd | 2742 | |
1da177e4 | 2743 | /* |
aa4148cf | 2744 | * Remove the devices from the tty layer |
1da177e4 | 2745 | */ |
a2bceae0 | 2746 | tty_unregister_device(drv->tty_driver, uport->line); |
1da177e4 | 2747 | |
4c6d5b4d GU |
2748 | tty = tty_port_tty_get(port); |
2749 | if (tty) { | |
a2bceae0 | 2750 | tty_vhangup(port->tty); |
4c6d5b4d GU |
2751 | tty_kref_put(tty); |
2752 | } | |
68ac64cd | 2753 | |
5f5c9ae5 GU |
2754 | /* |
2755 | * If the port is used as a console, unregister it | |
2756 | */ | |
2757 | if (uart_console(uport)) | |
2758 | unregister_console(uport->cons); | |
2759 | ||
68ac64cd RK |
2760 | /* |
2761 | * Free the port IO and memory resources, if any. | |
2762 | */ | |
a2bceae0 AC |
2763 | if (uport->type != PORT_UNKNOWN) |
2764 | uport->ops->release_port(uport); | |
266dcff0 | 2765 | kfree(uport->tty_groups); |
68ac64cd RK |
2766 | |
2767 | /* | |
2768 | * Indicate that there isn't a port here anymore. | |
2769 | */ | |
a2bceae0 | 2770 | uport->type = PORT_UNKNOWN; |
68ac64cd | 2771 | |
ebd2c8f6 | 2772 | state->uart_port = NULL; |
b342dd51 | 2773 | out: |
f392ecfa | 2774 | mutex_unlock(&port_mutex); |
1da177e4 | 2775 | |
b342dd51 | 2776 | return ret; |
1da177e4 LT |
2777 | } |
2778 | ||
2779 | /* | |
2780 | * Are the two ports equivalent? | |
2781 | */ | |
2782 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) | |
2783 | { | |
2784 | if (port1->iotype != port2->iotype) | |
2785 | return 0; | |
2786 | ||
2787 | switch (port1->iotype) { | |
2788 | case UPIO_PORT: | |
2789 | return (port1->iobase == port2->iobase); | |
2790 | case UPIO_HUB6: | |
2791 | return (port1->iobase == port2->iobase) && | |
2792 | (port1->hub6 == port2->hub6); | |
2793 | case UPIO_MEM: | |
d21b55d3 SS |
2794 | case UPIO_MEM32: |
2795 | case UPIO_AU: | |
2796 | case UPIO_TSI: | |
1624f003 | 2797 | return (port1->mapbase == port2->mapbase); |
1da177e4 LT |
2798 | } |
2799 | return 0; | |
2800 | } | |
2801 | EXPORT_SYMBOL(uart_match_port); | |
2802 | ||
027d7dac JS |
2803 | /** |
2804 | * uart_handle_dcd_change - handle a change of carrier detect state | |
2805 | * @uport: uart_port structure for the open port | |
2806 | * @status: new carrier detect status, nonzero if active | |
4d90bb14 PH |
2807 | * |
2808 | * Caller must hold uport->lock | |
027d7dac JS |
2809 | */ |
2810 | void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) | |
2811 | { | |
42381572 | 2812 | struct tty_port *port = &uport->state->port; |
43eca0ae | 2813 | struct tty_struct *tty = port->tty; |
c993257b | 2814 | struct tty_ldisc *ld; |
027d7dac | 2815 | |
4d90bb14 PH |
2816 | lockdep_assert_held_once(&uport->lock); |
2817 | ||
c993257b PH |
2818 | if (tty) { |
2819 | ld = tty_ldisc_ref(tty); | |
2820 | if (ld) { | |
2821 | if (ld->ops->dcd_change) | |
2822 | ld->ops->dcd_change(tty, status); | |
2823 | tty_ldisc_deref(ld); | |
2824 | } | |
42381572 | 2825 | } |
027d7dac JS |
2826 | |
2827 | uport->icount.dcd++; | |
027d7dac | 2828 | |
299245a1 | 2829 | if (uart_dcd_enabled(uport)) { |
027d7dac JS |
2830 | if (status) |
2831 | wake_up_interruptible(&port->open_wait); | |
43eca0ae AC |
2832 | else if (tty) |
2833 | tty_hangup(tty); | |
027d7dac | 2834 | } |
027d7dac JS |
2835 | } |
2836 | EXPORT_SYMBOL_GPL(uart_handle_dcd_change); | |
2837 | ||
2838 | /** | |
2839 | * uart_handle_cts_change - handle a change of clear-to-send state | |
2840 | * @uport: uart_port structure for the open port | |
2841 | * @status: new clear to send status, nonzero if active | |
4d90bb14 PH |
2842 | * |
2843 | * Caller must hold uport->lock | |
027d7dac JS |
2844 | */ |
2845 | void uart_handle_cts_change(struct uart_port *uport, unsigned int status) | |
2846 | { | |
4d90bb14 PH |
2847 | lockdep_assert_held_once(&uport->lock); |
2848 | ||
027d7dac JS |
2849 | uport->icount.cts++; |
2850 | ||
299245a1 | 2851 | if (uart_cts_enabled(uport)) { |
d01f4d18 | 2852 | if (uport->hw_stopped) { |
027d7dac | 2853 | if (status) { |
d01f4d18 | 2854 | uport->hw_stopped = 0; |
027d7dac JS |
2855 | uport->ops->start_tx(uport); |
2856 | uart_write_wakeup(uport); | |
2857 | } | |
2858 | } else { | |
2859 | if (!status) { | |
d01f4d18 | 2860 | uport->hw_stopped = 1; |
027d7dac JS |
2861 | uport->ops->stop_tx(uport); |
2862 | } | |
2863 | } | |
2864 | } | |
2865 | } | |
2866 | EXPORT_SYMBOL_GPL(uart_handle_cts_change); | |
2867 | ||
cf75525f JS |
2868 | /** |
2869 | * uart_insert_char - push a char to the uart layer | |
2870 | * | |
2871 | * User is responsible to call tty_flip_buffer_push when they are done with | |
2872 | * insertion. | |
2873 | * | |
2874 | * @port: corresponding port | |
2875 | * @status: state of the serial port RX buffer (LSR for 8250) | |
2876 | * @overrun: mask of overrun bits in @status | |
2877 | * @ch: character to push | |
2878 | * @flag: flag for the character (see TTY_NORMAL and friends) | |
2879 | */ | |
027d7dac JS |
2880 | void uart_insert_char(struct uart_port *port, unsigned int status, |
2881 | unsigned int overrun, unsigned int ch, unsigned int flag) | |
2882 | { | |
92a19f9c | 2883 | struct tty_port *tport = &port->state->port; |
027d7dac JS |
2884 | |
2885 | if ((status & port->ignore_status_mask & ~overrun) == 0) | |
92a19f9c | 2886 | if (tty_insert_flip_char(tport, ch, flag) == 0) |
dabfb351 | 2887 | ++port->icount.buf_overrun; |
027d7dac JS |
2888 | |
2889 | /* | |
2890 | * Overrun is special. Since it's reported immediately, | |
2891 | * it doesn't affect the current character. | |
2892 | */ | |
2893 | if (status & ~port->ignore_status_mask & overrun) | |
92a19f9c | 2894 | if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) |
dabfb351 | 2895 | ++port->icount.buf_overrun; |
027d7dac JS |
2896 | } |
2897 | EXPORT_SYMBOL_GPL(uart_insert_char); | |
2898 | ||
1da177e4 LT |
2899 | EXPORT_SYMBOL(uart_write_wakeup); |
2900 | EXPORT_SYMBOL(uart_register_driver); | |
2901 | EXPORT_SYMBOL(uart_unregister_driver); | |
2902 | EXPORT_SYMBOL(uart_suspend_port); | |
2903 | EXPORT_SYMBOL(uart_resume_port); | |
1da177e4 LT |
2904 | EXPORT_SYMBOL(uart_add_one_port); |
2905 | EXPORT_SYMBOL(uart_remove_one_port); | |
2906 | ||
2907 | MODULE_DESCRIPTION("Serial driver core"); | |
2908 | MODULE_LICENSE("GPL"); |