Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * linux/drivers/char/serial_core.h | |
4 | * | |
5 | * Copyright (C) 2000 Deep Blue Solutions Ltd. | |
1da177e4 LT |
6 | */ |
7 | #ifndef LINUX_SERIAL_CORE_H | |
8 | #define LINUX_SERIAL_CORE_H | |
9 | ||
c7ac15ce | 10 | #include <linux/bitops.h> |
661f83a6 | 11 | #include <linux/compiler.h> |
3e6f8806 | 12 | #include <linux/console.h> |
1da177e4 LT |
13 | #include <linux/interrupt.h> |
14 | #include <linux/circ_buf.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/tty.h> | |
e2862f6a | 18 | #include <linux/mutex.h> |
b11115c1 | 19 | #include <linux/sysrq.h> |
607ca46e | 20 | #include <uapi/linux/serial_core.h> |
1da177e4 | 21 | |
cf0ebee0 SP |
22 | #ifdef CONFIG_SERIAL_CORE_CONSOLE |
23 | #define uart_console(port) \ | |
24 | ((port)->cons && (port)->cons->index == (port)->line) | |
25 | #else | |
6b3cddcc | 26 | #define uart_console(port) ({ (void)port; 0; }) |
cf0ebee0 SP |
27 | #endif |
28 | ||
1da177e4 | 29 | struct uart_port; |
1da177e4 LT |
30 | struct serial_struct; |
31 | struct device; | |
167cbce2 | 32 | struct gpio_desc; |
1da177e4 | 33 | |
e60a7233 JS |
34 | /** |
35 | * struct uart_ops -- interface between serial_core and the driver | |
36 | * | |
e759d7c5 | 37 | * This structure describes all the operations that can be done on the |
e60a7233 JS |
38 | * physical hardware. |
39 | * | |
40 | * @tx_empty: ``unsigned int ()(struct uart_port *port)`` | |
41 | * | |
42 | * This function tests whether the transmitter fifo and shifter for the | |
43 | * @port is empty. If it is empty, this function should return | |
44 | * %TIOCSER_TEMT, otherwise return 0. If the port does not support this | |
45 | * operation, then it should return %TIOCSER_TEMT. | |
46 | * | |
47 | * Locking: none. | |
48 | * Interrupts: caller dependent. | |
49 | * This call must not sleep | |
50 | * | |
51 | * @set_mctrl: ``void ()(struct uart_port *port, unsigned int mctrl)`` | |
52 | * | |
53 | * This function sets the modem control lines for @port to the state | |
54 | * described by @mctrl. The relevant bits of @mctrl are: | |
55 | * | |
56 | * - %TIOCM_RTS RTS signal. | |
57 | * - %TIOCM_DTR DTR signal. | |
58 | * - %TIOCM_OUT1 OUT1 signal. | |
59 | * - %TIOCM_OUT2 OUT2 signal. | |
60 | * - %TIOCM_LOOP Set the port into loopback mode. | |
61 | * | |
62 | * If the appropriate bit is set, the signal should be driven | |
63 | * active. If the bit is clear, the signal should be driven | |
64 | * inactive. | |
65 | * | |
66 | * Locking: @port->lock taken. | |
67 | * Interrupts: locally disabled. | |
68 | * This call must not sleep | |
69 | * | |
70 | * @get_mctrl: ``unsigned int ()(struct uart_port *port)`` | |
71 | * | |
72 | * Returns the current state of modem control inputs of @port. The state | |
73 | * of the outputs should not be returned, since the core keeps track of | |
74 | * their state. The state information should include: | |
75 | * | |
76 | * - %TIOCM_CAR state of DCD signal | |
77 | * - %TIOCM_CTS state of CTS signal | |
78 | * - %TIOCM_DSR state of DSR signal | |
79 | * - %TIOCM_RI state of RI signal | |
80 | * | |
81 | * The bit is set if the signal is currently driven active. If | |
82 | * the port does not support CTS, DCD or DSR, the driver should | |
83 | * indicate that the signal is permanently active. If RI is | |
84 | * not available, the signal should not be indicated as active. | |
85 | * | |
86 | * Locking: @port->lock taken. | |
87 | * Interrupts: locally disabled. | |
88 | * This call must not sleep | |
89 | * | |
90 | * @stop_tx: ``void ()(struct uart_port *port)`` | |
91 | * | |
92 | * Stop transmitting characters. This might be due to the CTS line | |
93 | * becoming inactive or the tty layer indicating we want to stop | |
94 | * transmission due to an %XOFF character. | |
95 | * | |
96 | * The driver should stop transmitting characters as soon as possible. | |
97 | * | |
98 | * Locking: @port->lock taken. | |
99 | * Interrupts: locally disabled. | |
100 | * This call must not sleep | |
101 | * | |
102 | * @start_tx: ``void ()(struct uart_port *port)`` | |
103 | * | |
104 | * Start transmitting characters. | |
105 | * | |
106 | * Locking: @port->lock taken. | |
107 | * Interrupts: locally disabled. | |
108 | * This call must not sleep | |
109 | * | |
110 | * @throttle: ``void ()(struct uart_port *port)`` | |
111 | * | |
112 | * Notify the serial driver that input buffers for the line discipline are | |
113 | * close to full, and it should somehow signal that no more characters | |
114 | * should be sent to the serial port. | |
115 | * This will be called only if hardware assisted flow control is enabled. | |
116 | * | |
117 | * Locking: serialized with @unthrottle() and termios modification by the | |
118 | * tty layer. | |
119 | * | |
120 | * @unthrottle: ``void ()(struct uart_port *port)`` | |
121 | * | |
122 | * Notify the serial driver that characters can now be sent to the serial | |
123 | * port without fear of overrunning the input buffers of the line | |
124 | * disciplines. | |
125 | * | |
126 | * This will be called only if hardware assisted flow control is enabled. | |
127 | * | |
128 | * Locking: serialized with @throttle() and termios modification by the | |
129 | * tty layer. | |
130 | * | |
131 | * @send_xchar: ``void ()(struct uart_port *port, char ch)`` | |
132 | * | |
133 | * Transmit a high priority character, even if the port is stopped. This | |
134 | * is used to implement XON/XOFF flow control and tcflow(). If the serial | |
135 | * driver does not implement this function, the tty core will append the | |
136 | * character to the circular buffer and then call start_tx() / stop_tx() | |
137 | * to flush the data out. | |
138 | * | |
139 | * Do not transmit if @ch == '\0' (%__DISABLED_CHAR). | |
140 | * | |
141 | * Locking: none. | |
142 | * Interrupts: caller dependent. | |
143 | * | |
b5a5b9d5 MCC |
144 | * @start_rx: ``void ()(struct uart_port *port)`` |
145 | * | |
146 | * Start receiving characters. | |
147 | * | |
148 | * Locking: @port->lock taken. | |
149 | * Interrupts: locally disabled. | |
150 | * This call must not sleep | |
151 | * | |
e60a7233 JS |
152 | * @stop_rx: ``void ()(struct uart_port *port)`` |
153 | * | |
154 | * Stop receiving characters; the @port is in the process of being closed. | |
155 | * | |
156 | * Locking: @port->lock taken. | |
157 | * Interrupts: locally disabled. | |
158 | * This call must not sleep | |
159 | * | |
160 | * @enable_ms: ``void ()(struct uart_port *port)`` | |
161 | * | |
162 | * Enable the modem status interrupts. | |
163 | * | |
164 | * This method may be called multiple times. Modem status interrupts | |
165 | * should be disabled when the @shutdown() method is called. | |
166 | * | |
167 | * Locking: @port->lock taken. | |
168 | * Interrupts: locally disabled. | |
169 | * This call must not sleep | |
170 | * | |
171 | * @break_ctl: ``void ()(struct uart_port *port, int ctl)`` | |
172 | * | |
173 | * Control the transmission of a break signal. If @ctl is nonzero, the | |
174 | * break signal should be transmitted. The signal should be terminated | |
175 | * when another call is made with a zero @ctl. | |
176 | * | |
177 | * Locking: caller holds tty_port->mutex | |
178 | * | |
179 | * @startup: ``int ()(struct uart_port *port)`` | |
180 | * | |
181 | * Grab any interrupt resources and initialise any low level driver state. | |
182 | * Enable the port for reception. It should not activate RTS nor DTR; | |
183 | * this will be done via a separate call to @set_mctrl(). | |
184 | * | |
185 | * This method will only be called when the port is initially opened. | |
186 | * | |
187 | * Locking: port_sem taken. | |
188 | * Interrupts: globally disabled. | |
189 | * | |
190 | * @shutdown: ``void ()(struct uart_port *port)`` | |
191 | * | |
192 | * Disable the @port, disable any break condition that may be in effect, | |
193 | * and free any interrupt resources. It should not disable RTS nor DTR; | |
194 | * this will have already been done via a separate call to @set_mctrl(). | |
195 | * | |
196 | * Drivers must not access @port->state once this call has completed. | |
197 | * | |
198 | * This method will only be called when there are no more users of this | |
199 | * @port. | |
200 | * | |
201 | * Locking: port_sem taken. | |
202 | * Interrupts: caller dependent. | |
203 | * | |
204 | * @flush_buffer: ``void ()(struct uart_port *port)`` | |
205 | * | |
206 | * Flush any write buffers, reset any DMA state and stop any ongoing DMA | |
207 | * transfers. | |
208 | * | |
209 | * This will be called whenever the @port->state->xmit circular buffer is | |
210 | * cleared. | |
211 | * | |
212 | * Locking: @port->lock taken. | |
213 | * Interrupts: locally disabled. | |
214 | * This call must not sleep | |
215 | * | |
216 | * @set_termios: ``void ()(struct uart_port *port, struct ktermios *new, | |
217 | * struct ktermios *old)`` | |
218 | * | |
219 | * Change the @port parameters, including word length, parity, stop bits. | |
220 | * Update @port->read_status_mask and @port->ignore_status_mask to | |
221 | * indicate the types of events we are interested in receiving. Relevant | |
222 | * ktermios::c_cflag bits are: | |
223 | * | |
224 | * - %CSIZE - word size | |
225 | * - %CSTOPB - 2 stop bits | |
226 | * - %PARENB - parity enable | |
227 | * - %PARODD - odd parity (when %PARENB is in force) | |
228 | * - %ADDRB - address bit (changed through uart_port::rs485_config()). | |
229 | * - %CREAD - enable reception of characters (if not set, still receive | |
230 | * characters from the port, but throw them away). | |
231 | * - %CRTSCTS - if set, enable CTS status change reporting. | |
232 | * - %CLOCAL - if not set, enable modem status change reporting. | |
233 | * | |
234 | * Relevant ktermios::c_iflag bits are: | |
235 | * | |
236 | * - %INPCK - enable frame and parity error events to be passed to the TTY | |
237 | * layer. | |
238 | * - %BRKINT / %PARMRK - both of these enable break events to be passed to | |
239 | * the TTY layer. | |
240 | * - %IGNPAR - ignore parity and framing errors. | |
241 | * - %IGNBRK - ignore break errors. If %IGNPAR is also set, ignore overrun | |
242 | * errors as well. | |
243 | * | |
244 | * The interaction of the ktermios::c_iflag bits is as follows (parity | |
245 | * error given as an example): | |
246 | * | |
247 | * ============ ======= ======= ========================================= | |
248 | * Parity error INPCK IGNPAR | |
249 | * ============ ======= ======= ========================================= | |
250 | * n/a 0 n/a character received, marked as %TTY_NORMAL | |
251 | * None 1 n/a character received, marked as %TTY_NORMAL | |
252 | * Yes 1 0 character received, marked as %TTY_PARITY | |
253 | * Yes 1 1 character discarded | |
254 | * ============ ======= ======= ========================================= | |
255 | * | |
256 | * Other flags may be used (eg, xon/xoff characters) if your hardware | |
257 | * supports hardware "soft" flow control. | |
258 | * | |
259 | * Locking: caller holds tty_port->mutex | |
260 | * Interrupts: caller dependent. | |
261 | * This call must not sleep | |
262 | * | |
263 | * @set_ldisc: ``void ()(struct uart_port *port, struct ktermios *termios)`` | |
264 | * | |
265 | * Notifier for discipline change. See | |
266 | * Documentation/driver-api/tty/tty_ldisc.rst. | |
267 | * | |
268 | * Locking: caller holds tty_port->mutex | |
269 | * | |
270 | * @pm: ``void ()(struct uart_port *port, unsigned int state, | |
271 | * unsigned int oldstate)`` | |
272 | * | |
273 | * Perform any power management related activities on the specified @port. | |
274 | * @state indicates the new state (defined by enum uart_pm_state), | |
275 | * @oldstate indicates the previous state. | |
276 | * | |
277 | * This function should not be used to grab any resources. | |
278 | * | |
279 | * This will be called when the @port is initially opened and finally | |
280 | * closed, except when the @port is also the system console. This will | |
281 | * occur even if %CONFIG_PM is not set. | |
282 | * | |
283 | * Locking: none. | |
284 | * Interrupts: caller dependent. | |
285 | * | |
286 | * @type: ``const char *()(struct uart_port *port)`` | |
287 | * | |
288 | * Return a pointer to a string constant describing the specified @port, | |
289 | * or return %NULL, in which case the string 'unknown' is substituted. | |
290 | * | |
291 | * Locking: none. | |
292 | * Interrupts: caller dependent. | |
293 | * | |
294 | * @release_port: ``void ()(struct uart_port *port)`` | |
295 | * | |
296 | * Release any memory and IO region resources currently in use by the | |
297 | * @port. | |
298 | * | |
299 | * Locking: none. | |
300 | * Interrupts: caller dependent. | |
301 | * | |
302 | * @request_port: ``int ()(struct uart_port *port)`` | |
303 | * | |
304 | * Request any memory and IO region resources required by the port. If any | |
305 | * fail, no resources should be registered when this function returns, and | |
306 | * it should return -%EBUSY on failure. | |
307 | * | |
308 | * Locking: none. | |
309 | * Interrupts: caller dependent. | |
310 | * | |
311 | * @config_port: ``void ()(struct uart_port *port, int type)`` | |
312 | * | |
313 | * Perform any autoconfiguration steps required for the @port. @type | |
314 | * contains a bit mask of the required configuration. %UART_CONFIG_TYPE | |
315 | * indicates that the port requires detection and identification. | |
316 | * @port->type should be set to the type found, or %PORT_UNKNOWN if no | |
317 | * port was detected. | |
318 | * | |
319 | * %UART_CONFIG_IRQ indicates autoconfiguration of the interrupt signal, | |
320 | * which should be probed using standard kernel autoprobing techniques. | |
321 | * This is not necessary on platforms where ports have interrupts | |
322 | * internally hard wired (eg, system on a chip implementations). | |
323 | * | |
324 | * Locking: none. | |
325 | * Interrupts: caller dependent. | |
326 | * | |
327 | * @verify_port: ``int ()(struct uart_port *port, | |
328 | * struct serial_struct *serinfo)`` | |
329 | * | |
330 | * Verify the new serial port information contained within @serinfo is | |
331 | * suitable for this port type. | |
332 | * | |
333 | * Locking: none. | |
334 | * Interrupts: caller dependent. | |
335 | * | |
336 | * @ioctl: ``int ()(struct uart_port *port, unsigned int cmd, | |
337 | * unsigned long arg)`` | |
338 | * | |
339 | * Perform any port specific IOCTLs. IOCTL commands must be defined using | |
340 | * the standard numbering system found in <asm/ioctl.h>. | |
341 | * | |
342 | * Locking: none. | |
343 | * Interrupts: caller dependent. | |
344 | * | |
345 | * @poll_init: ``int ()(struct uart_port *port)`` | |
346 | * | |
347 | * Called by kgdb to perform the minimal hardware initialization needed to | |
348 | * support @poll_put_char() and @poll_get_char(). Unlike @startup(), this | |
349 | * should not request interrupts. | |
350 | * | |
351 | * Locking: %tty_mutex and tty_port->mutex taken. | |
352 | * Interrupts: n/a. | |
353 | * | |
354 | * @poll_put_char: ``void ()(struct uart_port *port, unsigned char ch)`` | |
355 | * | |
356 | * Called by kgdb to write a single character @ch directly to the serial | |
357 | * @port. It can and should block until there is space in the TX FIFO. | |
358 | * | |
359 | * Locking: none. | |
360 | * Interrupts: caller dependent. | |
361 | * This call must not sleep | |
362 | * | |
363 | * @poll_get_char: ``int ()(struct uart_port *port)`` | |
364 | * | |
365 | * Called by kgdb to read a single character directly from the serial | |
366 | * port. If data is available, it should be returned; otherwise the | |
367 | * function should return %NO_POLL_CHAR immediately. | |
368 | * | |
369 | * Locking: none. | |
370 | * Interrupts: caller dependent. | |
371 | * This call must not sleep | |
1da177e4 LT |
372 | */ |
373 | struct uart_ops { | |
374 | unsigned int (*tx_empty)(struct uart_port *); | |
375 | void (*set_mctrl)(struct uart_port *, unsigned int mctrl); | |
376 | unsigned int (*get_mctrl)(struct uart_port *); | |
b129a8cc RK |
377 | void (*stop_tx)(struct uart_port *); |
378 | void (*start_tx)(struct uart_port *); | |
9aba8d5b RK |
379 | void (*throttle)(struct uart_port *); |
380 | void (*unthrottle)(struct uart_port *); | |
1da177e4 LT |
381 | void (*send_xchar)(struct uart_port *, char ch); |
382 | void (*stop_rx)(struct uart_port *); | |
cfab87c2 | 383 | void (*start_rx)(struct uart_port *); |
1da177e4 LT |
384 | void (*enable_ms)(struct uart_port *); |
385 | void (*break_ctl)(struct uart_port *, int ctl); | |
386 | int (*startup)(struct uart_port *); | |
387 | void (*shutdown)(struct uart_port *); | |
6bb0e3a5 | 388 | void (*flush_buffer)(struct uart_port *); |
606d099c | 389 | void (*set_termios)(struct uart_port *, struct ktermios *new, |
bec5b814 | 390 | const struct ktermios *old); |
732a84a0 | 391 | void (*set_ldisc)(struct uart_port *, struct ktermios *); |
1da177e4 LT |
392 | void (*pm)(struct uart_port *, unsigned int state, |
393 | unsigned int oldstate); | |
e759d7c5 | 394 | const char *(*type)(struct uart_port *); |
1da177e4 | 395 | void (*release_port)(struct uart_port *); |
1da177e4 LT |
396 | int (*request_port)(struct uart_port *); |
397 | void (*config_port)(struct uart_port *, int); | |
398 | int (*verify_port)(struct uart_port *, struct serial_struct *); | |
399 | int (*ioctl)(struct uart_port *, unsigned int, unsigned long); | |
f2d937f3 | 400 | #ifdef CONFIG_CONSOLE_POLL |
c7f3e708 | 401 | int (*poll_init)(struct uart_port *); |
e759d7c5 | 402 | void (*poll_put_char)(struct uart_port *, unsigned char); |
f2d937f3 JW |
403 | int (*poll_get_char)(struct uart_port *); |
404 | #endif | |
1da177e4 LT |
405 | }; |
406 | ||
f5316b4a | 407 | #define NO_POLL_CHAR 0x00ff0000 |
1da177e4 LT |
408 | #define UART_CONFIG_TYPE (1 << 0) |
409 | #define UART_CONFIG_IRQ (1 << 1) | |
410 | ||
411 | struct uart_icount { | |
412 | __u32 cts; | |
413 | __u32 dsr; | |
414 | __u32 rng; | |
415 | __u32 dcd; | |
416 | __u32 rx; | |
417 | __u32 tx; | |
418 | __u32 frame; | |
419 | __u32 overrun; | |
420 | __u32 parity; | |
421 | __u32 brk; | |
422 | __u32 buf_overrun; | |
423 | }; | |
424 | ||
9906890c | 425 | typedef u64 __bitwise upf_t; |
9efeccac | 426 | typedef unsigned int __bitwise upstat_t; |
0077d45e | 427 | |
1da177e4 LT |
428 | struct uart_port { |
429 | spinlock_t lock; /* port lock */ | |
0c8946d9 | 430 | unsigned long iobase; /* in/out[bwl] */ |
1da177e4 | 431 | unsigned char __iomem *membase; /* read/write[bwl] */ |
7d6a07d1 DD |
432 | unsigned int (*serial_in)(struct uart_port *, int); |
433 | void (*serial_out)(struct uart_port *, int, int); | |
235dae5d PL |
434 | void (*set_termios)(struct uart_port *, |
435 | struct ktermios *new, | |
bec5b814 | 436 | const struct ktermios *old); |
db405a8f EB |
437 | void (*set_ldisc)(struct uart_port *, |
438 | struct ktermios *); | |
144ef5c2 | 439 | unsigned int (*get_mctrl)(struct uart_port *); |
4bf4ea9d | 440 | void (*set_mctrl)(struct uart_port *, unsigned int); |
0238d2b4 JZ |
441 | unsigned int (*get_divisor)(struct uart_port *, |
442 | unsigned int baud, | |
443 | unsigned int *frac); | |
444 | void (*set_divisor)(struct uart_port *, | |
445 | unsigned int baud, | |
446 | unsigned int quot, | |
447 | unsigned int quot_frac); | |
b99b121b SAS |
448 | int (*startup)(struct uart_port *port); |
449 | void (*shutdown)(struct uart_port *port); | |
234abab1 SAS |
450 | void (*throttle)(struct uart_port *port); |
451 | void (*unthrottle)(struct uart_port *port); | |
a74036f5 | 452 | int (*handle_irq)(struct uart_port *); |
c161afe9 ML |
453 | void (*pm)(struct uart_port *, unsigned int state, |
454 | unsigned int old); | |
bf03f65b | 455 | void (*handle_break)(struct uart_port *); |
a5f276f1 | 456 | int (*rs485_config)(struct uart_port *, |
ae50bb27 | 457 | struct ktermios *termios, |
a5f276f1 | 458 | struct serial_rs485 *rs485); |
ad8c0eaa NF |
459 | int (*iso7816_config)(struct uart_port *, |
460 | struct serial_iso7816 *iso7816); | |
1da177e4 | 461 | unsigned int irq; /* irq number */ |
1c2f0493 | 462 | unsigned long irqflags; /* irq flags */ |
1da177e4 | 463 | unsigned int uartclk; /* base uart clock */ |
947deee8 | 464 | unsigned int fifosize; /* tx fifo size */ |
1da177e4 LT |
465 | unsigned char x_char; /* xon/xoff char */ |
466 | unsigned char regshift; /* reg offset shift */ | |
467 | unsigned char iotype; /* io access style */ | |
c7ac15ce | 468 | unsigned char quirks; /* internal quirks */ |
1da177e4 | 469 | |
647f162b PH |
470 | #define UPIO_PORT (SERIAL_IO_PORT) /* 8b I/O port access */ |
471 | #define UPIO_HUB6 (SERIAL_IO_HUB6) /* Hub6 ISA card */ | |
858965d9 | 472 | #define UPIO_MEM (SERIAL_IO_MEM) /* driver-specific */ |
647f162b PH |
473 | #define UPIO_MEM32 (SERIAL_IO_MEM32) /* 32b little endian */ |
474 | #define UPIO_AU (SERIAL_IO_AU) /* Au1x00 and RT288x type IO */ | |
475 | #define UPIO_TSI (SERIAL_IO_TSI) /* Tsi108/109 type IO */ | |
476 | #define UPIO_MEM32BE (SERIAL_IO_MEM32BE) /* 32b big endian */ | |
bd94c407 | 477 | #define UPIO_MEM16 (SERIAL_IO_MEM16) /* 16b little endian */ |
1da177e4 | 478 | |
c7ac15ce AS |
479 | /* quirks must be updated while holding port mutex */ |
480 | #define UPQ_NO_TXEN_TEST BIT(0) | |
481 | ||
1da177e4 LT |
482 | unsigned int read_status_mask; /* driver specific */ |
483 | unsigned int ignore_status_mask; /* driver specific */ | |
ebd2c8f6 | 484 | struct uart_state *state; /* pointer to parent state */ |
1da177e4 LT |
485 | struct uart_icount icount; /* statistics */ |
486 | ||
487 | struct console *cons; /* struct console, if any */ | |
8a949b07 | 488 | /* flags must be updated while holding port mutex */ |
0077d45e RK |
489 | upf_t flags; |
490 | ||
904326ec PH |
491 | /* |
492 | * These flags must be equivalent to the flags defined in | |
493 | * include/uapi/linux/tty_flags.h which are the userspace definitions | |
494 | * assigned from the serial_struct flags in uart_set_info() | |
495 | * [for bit definitions in the UPF_CHANGE_MASK] | |
496 | * | |
916acbf6 | 497 | * Bits [0..ASYNCB_LAST_USER] are userspace defined/visible/changeable |
904326ec PH |
498 | * The remaining bits are serial-core specific and not modifiable by |
499 | * userspace. | |
500 | */ | |
501 | #define UPF_FOURPORT ((__force upf_t) ASYNC_FOURPORT /* 1 */ ) | |
502 | #define UPF_SAK ((__force upf_t) ASYNC_SAK /* 2 */ ) | |
503 | #define UPF_SPD_HI ((__force upf_t) ASYNC_SPD_HI /* 4 */ ) | |
504 | #define UPF_SPD_VHI ((__force upf_t) ASYNC_SPD_VHI /* 5 */ ) | |
505 | #define UPF_SPD_CUST ((__force upf_t) ASYNC_SPD_CUST /* 0x0030 */ ) | |
506 | #define UPF_SPD_WARP ((__force upf_t) ASYNC_SPD_WARP /* 0x1010 */ ) | |
507 | #define UPF_SPD_MASK ((__force upf_t) ASYNC_SPD_MASK /* 0x1030 */ ) | |
508 | #define UPF_SKIP_TEST ((__force upf_t) ASYNC_SKIP_TEST /* 6 */ ) | |
509 | #define UPF_AUTO_IRQ ((__force upf_t) ASYNC_AUTO_IRQ /* 7 */ ) | |
510 | #define UPF_HARDPPS_CD ((__force upf_t) ASYNC_HARDPPS_CD /* 11 */ ) | |
511 | #define UPF_SPD_SHI ((__force upf_t) ASYNC_SPD_SHI /* 12 */ ) | |
512 | #define UPF_LOW_LATENCY ((__force upf_t) ASYNC_LOW_LATENCY /* 13 */ ) | |
513 | #define UPF_BUGGY_UART ((__force upf_t) ASYNC_BUGGY_UART /* 14 */ ) | |
904326ec PH |
514 | #define UPF_MAGIC_MULTIPLIER ((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ ) |
515 | ||
46a8973c | 516 | #define UPF_NO_THRE_TEST ((__force upf_t) BIT_ULL(19)) |
391f93f2 | 517 | /* Port has hardware-assisted h/w flow control */ |
46a8973c MR |
518 | #define UPF_AUTO_CTS ((__force upf_t) BIT_ULL(20)) |
519 | #define UPF_AUTO_RTS ((__force upf_t) BIT_ULL(21)) | |
391f93f2 | 520 | #define UPF_HARD_FLOW ((__force upf_t) (UPF_AUTO_CTS | UPF_AUTO_RTS)) |
2cbacafd | 521 | /* Port has hardware-assisted s/w flow control */ |
46a8973c MR |
522 | #define UPF_SOFT_FLOW ((__force upf_t) BIT_ULL(22)) |
523 | #define UPF_CONS_FLOW ((__force upf_t) BIT_ULL(23)) | |
524 | #define UPF_SHARE_IRQ ((__force upf_t) BIT_ULL(24)) | |
525 | #define UPF_EXAR_EFR ((__force upf_t) BIT_ULL(25)) | |
526 | #define UPF_BUG_THRE ((__force upf_t) BIT_ULL(26)) | |
8e23fcc8 | 527 | /* The exact UART type is known and should not be probed. */ |
46a8973c MR |
528 | #define UPF_FIXED_TYPE ((__force upf_t) BIT_ULL(27)) |
529 | #define UPF_BOOT_AUTOCONF ((__force upf_t) BIT_ULL(28)) | |
530 | #define UPF_FIXED_PORT ((__force upf_t) BIT_ULL(29)) | |
531 | #define UPF_DEAD ((__force upf_t) BIT_ULL(30)) | |
532 | #define UPF_IOREMAP ((__force upf_t) BIT_ULL(31)) | |
533 | #define UPF_FULL_PROBE ((__force upf_t) BIT_ULL(32)) | |
0077d45e | 534 | |
904326ec PH |
535 | #define __UPF_CHANGE_MASK 0x17fff |
536 | #define UPF_CHANGE_MASK ((__force upf_t) __UPF_CHANGE_MASK) | |
0077d45e | 537 | #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY)) |
1da177e4 | 538 | |
904326ec PH |
539 | #if __UPF_CHANGE_MASK > ASYNC_FLAGS |
540 | #error Change mask not equivalent to userspace-visible bit defines | |
541 | #endif | |
542 | ||
391f93f2 PH |
543 | /* |
544 | * Must hold termios_rwsem, port mutex and port lock to change; | |
545 | * can hold any one lock to read. | |
546 | */ | |
299245a1 PH |
547 | upstat_t status; |
548 | ||
549 | #define UPSTAT_CTS_ENABLE ((__force upstat_t) (1 << 0)) | |
550 | #define UPSTAT_DCD_ENABLE ((__force upstat_t) (1 << 1)) | |
391f93f2 PH |
551 | #define UPSTAT_AUTORTS ((__force upstat_t) (1 << 2)) |
552 | #define UPSTAT_AUTOCTS ((__force upstat_t) (1 << 3)) | |
553 | #define UPSTAT_AUTOXOFF ((__force upstat_t) (1 << 4)) | |
c5f78b1f | 554 | #define UPSTAT_SYNC_FIFO ((__force upstat_t) (1 << 5)) |
299245a1 | 555 | |
b5def43a | 556 | bool hw_stopped; /* sw-assisted CTS flow state */ |
1da177e4 | 557 | unsigned int mctrl; /* current modem ctrl settings */ |
31f6bd7f | 558 | unsigned int frame_time; /* frame timing in ns */ |
1da177e4 | 559 | unsigned int type; /* port type */ |
ba899dbc | 560 | const struct uart_ops *ops; |
1da177e4 LT |
561 | unsigned int custom_divisor; |
562 | unsigned int line; /* port index */ | |
959801fe | 563 | unsigned int minor; |
4f640efb | 564 | resource_size_t mapbase; /* for ioremap */ |
ee97d0e3 | 565 | resource_size_t mapsize; |
1da177e4 | 566 | struct device *dev; /* parent device */ |
7e5ed9f5 | 567 | |
7e5ed9f5 DS |
568 | unsigned long sysrq; /* sysrq timeout */ |
569 | unsigned int sysrq_ch; /* char for sysrq */ | |
1997e9df | 570 | unsigned char has_sysrq; |
68af4317 | 571 | unsigned char sysrq_seq; /* index in sysrq_toggle_seq */ |
7e5ed9f5 | 572 | |
1da177e4 | 573 | unsigned char hub6; /* this should be in the 8250 driver */ |
b3b708fa | 574 | unsigned char suspended; |
e0830dbf | 575 | unsigned char console_reinit; |
2e94d5ae | 576 | const char *name; /* port name */ |
266dcff0 GKH |
577 | struct attribute_group *attr_group; /* port specific attributes */ |
578 | const struct attribute_group **tty_groups; /* all attributes (serial core use only) */ | |
a5f276f1 | 579 | struct serial_rs485 rs485; |
0139da50 | 580 | struct serial_rs485 rs485_supported; /* Supported mask for serial_rs485 */ |
d58a2df3 | 581 | struct gpio_desc *rs485_term_gpio; /* enable RS485 bus termination */ |
163f080e | 582 | struct gpio_desc *rs485_rx_during_tx_gpio; /* Output GPIO that sets the state of RS485 RX during TX */ |
ad8c0eaa | 583 | struct serial_iso7816 iso7816; |
beab697a | 584 | void *private_data; /* generic platform data pointer */ |
1da177e4 LT |
585 | }; |
586 | ||
927353a7 PG |
587 | static inline int serial_port_in(struct uart_port *up, int offset) |
588 | { | |
589 | return up->serial_in(up, offset); | |
590 | } | |
591 | ||
592 | static inline void serial_port_out(struct uart_port *up, int offset, int value) | |
593 | { | |
594 | up->serial_out(up, offset, value); | |
595 | } | |
596 | ||
6f538fe3 LW |
597 | /** |
598 | * enum uart_pm_state - power states for UARTs | |
599 | * @UART_PM_STATE_ON: UART is powered, up and operational | |
600 | * @UART_PM_STATE_OFF: UART is powered off | |
601 | * @UART_PM_STATE_UNDEFINED: sentinel | |
602 | */ | |
603 | enum uart_pm_state { | |
604 | UART_PM_STATE_ON = 0, | |
605 | UART_PM_STATE_OFF = 3, /* number taken from ACPI */ | |
606 | UART_PM_STATE_UNDEFINED, | |
607 | }; | |
608 | ||
ebd2c8f6 AC |
609 | /* |
610 | * This is the state information which is persistent across opens. | |
ebd2c8f6 AC |
611 | */ |
612 | struct uart_state { | |
df4f4dd4 | 613 | struct tty_port port; |
ebd2c8f6 | 614 | |
6f538fe3 | 615 | enum uart_pm_state pm_state; |
1da177e4 | 616 | struct circ_buf xmit; |
1da177e4 | 617 | |
9ed19428 PH |
618 | atomic_t refcount; |
619 | wait_queue_head_t remove_wait; | |
ebd2c8f6 | 620 | struct uart_port *uart_port; |
f751928e AC |
621 | }; |
622 | ||
623 | #define UART_XMIT_SIZE PAGE_SIZE | |
624 | ||
625 | ||
1da177e4 LT |
626 | /* number of characters left in xmit buffer before we ask for more */ |
627 | #define WAKEUP_CHARS 256 | |
628 | ||
e77cab77 IJ |
629 | /** |
630 | * uart_xmit_advance - Advance xmit buffer and account Tx'ed chars | |
631 | * @up: uart_port structure describing the port | |
632 | * @chars: number of characters sent | |
633 | * | |
634 | * This function advances the tail of circular xmit buffer by the number of | |
635 | * @chars transmitted and handles accounting of transmitted bytes (into | |
636 | * @up's icount.tx). | |
637 | */ | |
638 | static inline void uart_xmit_advance(struct uart_port *up, unsigned int chars) | |
639 | { | |
640 | struct circ_buf *xmit = &up->state->xmit; | |
641 | ||
642 | xmit->tail = (xmit->tail + chars) & (UART_XMIT_SIZE - 1); | |
643 | up->icount.tx += chars; | |
644 | } | |
645 | ||
1da177e4 LT |
646 | struct module; |
647 | struct tty_driver; | |
648 | ||
649 | struct uart_driver { | |
650 | struct module *owner; | |
651 | const char *driver_name; | |
652 | const char *dev_name; | |
1da177e4 LT |
653 | int major; |
654 | int minor; | |
655 | int nr; | |
656 | struct console *cons; | |
657 | ||
658 | /* | |
659 | * these are private; the low level driver should not | |
660 | * touch these; they should be initialised to NULL | |
661 | */ | |
662 | struct uart_state *state; | |
663 | struct tty_driver *tty_driver; | |
664 | }; | |
665 | ||
666 | void uart_write_wakeup(struct uart_port *port); | |
667 | ||
8275b48b JSS |
668 | #define __uart_port_tx(uport, ch, tx_ready, put_char, tx_done, for_test, \ |
669 | for_post) \ | |
670 | ({ \ | |
671 | struct uart_port *__port = (uport); \ | |
672 | struct circ_buf *xmit = &__port->state->xmit; \ | |
673 | unsigned int pending; \ | |
674 | \ | |
675 | for (; (for_test) && (tx_ready); (for_post), __port->icount.tx++) { \ | |
676 | if (__port->x_char) { \ | |
677 | (ch) = __port->x_char; \ | |
678 | (put_char); \ | |
679 | __port->x_char = 0; \ | |
680 | continue; \ | |
681 | } \ | |
682 | \ | |
683 | if (uart_circ_empty(xmit) || uart_tx_stopped(__port)) \ | |
684 | break; \ | |
685 | \ | |
686 | (ch) = xmit->buf[xmit->tail]; \ | |
687 | (put_char); \ | |
688 | xmit->tail = (xmit->tail + 1) % UART_XMIT_SIZE; \ | |
689 | } \ | |
690 | \ | |
691 | (tx_done); \ | |
692 | \ | |
693 | pending = uart_circ_chars_pending(xmit); \ | |
694 | if (pending < WAKEUP_CHARS) { \ | |
695 | uart_write_wakeup(__port); \ | |
696 | \ | |
697 | if (pending == 0) \ | |
698 | __port->ops->stop_tx(__port); \ | |
699 | } \ | |
700 | \ | |
701 | pending; \ | |
702 | }) | |
703 | ||
704 | /** | |
705 | * uart_port_tx_limited -- transmit helper for uart_port with count limiting | |
706 | * @port: uart port | |
707 | * @ch: variable to store a character to be written to the HW | |
708 | * @count: a limit of characters to send | |
709 | * @tx_ready: can HW accept more data function | |
710 | * @put_char: function to write a character | |
711 | * @tx_done: function to call after the loop is done | |
712 | * | |
713 | * This helper transmits characters from the xmit buffer to the hardware using | |
714 | * @put_char(). It does so until @count characters are sent and while @tx_ready | |
715 | * evaluates to true. | |
716 | * | |
717 | * Returns: the number of characters in the xmit buffer when done. | |
718 | * | |
719 | * The expression in macro parameters shall be designed as follows: | |
720 | * * **tx_ready:** should evaluate to true if the HW can accept more data to | |
721 | * be sent. This parameter can be %true, which means the HW is always ready. | |
722 | * * **put_char:** shall write @ch to the device of @port. | |
723 | * * **tx_done:** when the write loop is done, this can perform arbitrary | |
724 | * action before potential invocation of ops->stop_tx() happens. If the | |
725 | * driver does not need to do anything, use e.g. ({}). | |
726 | * | |
727 | * For all of them, @port->lock is held, interrupts are locally disabled and | |
728 | * the expressions must not sleep. | |
729 | */ | |
730 | #define uart_port_tx_limited(port, ch, count, tx_ready, put_char, tx_done) ({ \ | |
731 | unsigned int __count = (count); \ | |
732 | __uart_port_tx(port, ch, tx_ready, put_char, tx_done, __count, \ | |
733 | __count--); \ | |
734 | }) | |
735 | ||
736 | /** | |
737 | * uart_port_tx -- transmit helper for uart_port | |
738 | * @port: uart port | |
739 | * @ch: variable to store a character to be written to the HW | |
740 | * @tx_ready: can HW accept more data function | |
741 | * @put_char: function to write a character | |
742 | * | |
743 | * See uart_port_tx_limited() for more details. | |
744 | */ | |
745 | #define uart_port_tx(port, ch, tx_ready, put_char) \ | |
746 | __uart_port_tx(port, ch, tx_ready, put_char, ({}), true, ({})) | |
747 | ||
1da177e4 LT |
748 | /* |
749 | * Baud rate helpers. | |
750 | */ | |
751 | void uart_update_timeout(struct uart_port *port, unsigned int cflag, | |
752 | unsigned int baud); | |
606d099c | 753 | unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
bec5b814 | 754 | const struct ktermios *old, unsigned int min, |
1da177e4 LT |
755 | unsigned int max); |
756 | unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud); | |
757 | ||
f9008285 IJ |
758 | /* |
759 | * Calculates FIFO drain time. | |
760 | */ | |
761 | static inline unsigned long uart_fifo_timeout(struct uart_port *port) | |
762 | { | |
763 | u64 fifo_timeout = (u64)READ_ONCE(port->frame_time) * port->fifosize; | |
764 | ||
765 | /* Add .02 seconds of slop */ | |
766 | fifo_timeout += 20 * NSEC_PER_MSEC; | |
767 | ||
768 | return max(nsecs_to_jiffies(fifo_timeout), 1UL); | |
769 | } | |
770 | ||
54381067 AV |
771 | /* Base timer interval for polling */ |
772 | static inline int uart_poll_timeout(struct uart_port *port) | |
773 | { | |
f9008285 | 774 | int timeout = uart_fifo_timeout(port); |
54381067 AV |
775 | |
776 | return timeout > 6 ? (timeout / 2 - 2) : 1; | |
777 | } | |
778 | ||
1da177e4 LT |
779 | /* |
780 | * Console helpers. | |
781 | */ | |
9aac5887 RH |
782 | struct earlycon_device { |
783 | struct console *con; | |
784 | struct uart_port port; | |
41000b03 | 785 | char options[32]; /* e.g., 115200n8 */ |
9aac5887 RH |
786 | unsigned int baud; |
787 | }; | |
9aac5887 | 788 | |
470ca0de | 789 | struct earlycon_id { |
c1c734cb DA |
790 | char name[15]; |
791 | char name_term; /* In case compiler didn't '\0' term name */ | |
2eaa7909 | 792 | char compatible[128]; |
470ca0de | 793 | int (*setup)(struct earlycon_device *, const char *options); |
dd709e72 | 794 | }; |
470ca0de | 795 | |
62dcd9c5 JH |
796 | extern const struct earlycon_id __earlycon_table[]; |
797 | extern const struct earlycon_id __earlycon_table_end[]; | |
2eaa7909 | 798 | |
f8ba3647 MY |
799 | #if defined(CONFIG_SERIAL_EARLYCON) && !defined(MODULE) |
800 | #define EARLYCON_USED_OR_UNUSED __used | |
801 | #else | |
802 | #define EARLYCON_USED_OR_UNUSED __maybe_unused | |
803 | #endif | |
804 | ||
62dcd9c5 JH |
805 | #define OF_EARLYCON_DECLARE(_name, compat, fn) \ |
806 | static const struct earlycon_id __UNIQUE_ID(__earlycon_##_name) \ | |
807 | EARLYCON_USED_OR_UNUSED __section("__earlycon_table") \ | |
808 | __aligned(__alignof__(struct earlycon_id)) \ | |
2eaa7909 PH |
809 | = { .name = __stringify(_name), \ |
810 | .compatible = compat, \ | |
76437b34 | 811 | .setup = fn } |
2eaa7909 PH |
812 | |
813 | #define EARLYCON_DECLARE(_name, fn) OF_EARLYCON_DECLARE(_name, "", fn) | |
814 | ||
6229ad99 IJ |
815 | int of_setup_earlycon(const struct earlycon_id *match, unsigned long node, |
816 | const char *options); | |
b0b6abd3 | 817 | |
ad1696f6 | 818 | #ifdef CONFIG_SERIAL_EARLYCON |
0231d000 | 819 | extern bool earlycon_acpi_spcr_enable __initdata; |
ad1696f6 AM |
820 | int setup_earlycon(char *buf); |
821 | #else | |
219c7b06 | 822 | static const bool earlycon_acpi_spcr_enable EARLYCON_USED_OR_UNUSED; |
ad1696f6 AM |
823 | static inline int setup_earlycon(char *buf) { return 0; } |
824 | #endif | |
825 | ||
452b9b24 JO |
826 | /* Variant of uart_console_registered() when the console_list_lock is held. */ |
827 | static inline bool uart_console_registered_locked(struct uart_port *port) | |
f9b11229 | 828 | { |
452b9b24 JO |
829 | return uart_console(port) && console_is_registered_locked(port->cons); |
830 | } | |
831 | ||
832 | static inline bool uart_console_registered(struct uart_port *port) | |
833 | { | |
834 | return uart_console(port) && console_is_registered(port->cons); | |
f9b11229 IJ |
835 | } |
836 | ||
1da177e4 LT |
837 | struct uart_port *uart_get_console(struct uart_port *ports, int nr, |
838 | struct console *c); | |
46e36683 | 839 | int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, |
73abaf87 | 840 | char **options); |
0f646b63 | 841 | void uart_parse_options(const char *options, int *baud, int *parity, int *bits, |
1da177e4 LT |
842 | int *flow); |
843 | int uart_set_options(struct uart_port *port, struct console *co, int baud, | |
844 | int parity, int bits, int flow); | |
845 | struct tty_driver *uart_console_device(struct console *co, int *index); | |
d358788f RK |
846 | void uart_console_write(struct uart_port *port, const char *s, |
847 | unsigned int count, | |
3f8bab17 | 848 | void (*putchar)(struct uart_port *, unsigned char)); |
1da177e4 LT |
849 | |
850 | /* | |
851 | * Port/driver registration/removal | |
852 | */ | |
853 | int uart_register_driver(struct uart_driver *uart); | |
854 | void uart_unregister_driver(struct uart_driver *uart); | |
1da177e4 LT |
855 | int uart_add_one_port(struct uart_driver *reg, struct uart_port *port); |
856 | int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port); | |
b8be5db5 JS |
857 | bool uart_match_port(const struct uart_port *port1, |
858 | const struct uart_port *port2); | |
1da177e4 LT |
859 | |
860 | /* | |
861 | * Power Management | |
862 | */ | |
863 | int uart_suspend_port(struct uart_driver *reg, struct uart_port *port); | |
864 | int uart_resume_port(struct uart_driver *reg, struct uart_port *port); | |
865 | ||
866 | #define uart_circ_empty(circ) ((circ)->head == (circ)->tail) | |
867 | #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0) | |
868 | ||
869 | #define uart_circ_chars_pending(circ) \ | |
870 | (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
871 | ||
872 | #define uart_circ_chars_free(circ) \ | |
873 | (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
874 | ||
f751928e AC |
875 | static inline int uart_tx_stopped(struct uart_port *port) |
876 | { | |
ebd2c8f6 | 877 | struct tty_struct *tty = port->state->port.tty; |
6e94dbc7 | 878 | if ((tty && tty->flow.stopped) || port->hw_stopped) |
f751928e AC |
879 | return 1; |
880 | return 0; | |
881 | } | |
1da177e4 | 882 | |
299245a1 PH |
883 | static inline bool uart_cts_enabled(struct uart_port *uport) |
884 | { | |
d4260b51 | 885 | return !!(uport->status & UPSTAT_CTS_ENABLE); |
299245a1 PH |
886 | } |
887 | ||
391f93f2 PH |
888 | static inline bool uart_softcts_mode(struct uart_port *uport) |
889 | { | |
890 | upstat_t mask = UPSTAT_CTS_ENABLE | UPSTAT_AUTOCTS; | |
891 | ||
892 | return ((uport->status & mask) == UPSTAT_CTS_ENABLE); | |
893 | } | |
894 | ||
1da177e4 LT |
895 | /* |
896 | * The following are helper functions for the low level drivers. | |
897 | */ | |
027d7dac | 898 | |
6229ad99 IJ |
899 | void uart_handle_dcd_change(struct uart_port *uport, bool active); |
900 | void uart_handle_cts_change(struct uart_port *uport, bool active); | |
027d7dac | 901 | |
6229ad99 IJ |
902 | void uart_insert_char(struct uart_port *port, unsigned int status, |
903 | unsigned int overrun, unsigned int ch, unsigned int flag); | |
027d7dac | 904 | |
f58c252e IJ |
905 | void uart_xchar_out(struct uart_port *uport, int offset); |
906 | ||
08d54703 JH |
907 | #ifdef CONFIG_MAGIC_SYSRQ_SERIAL |
908 | #define SYSRQ_TIMEOUT (HZ * 5) | |
909 | ||
910 | bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch); | |
911 | ||
912 | static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) | |
913 | { | |
22538565 | 914 | if (!port->sysrq) |
08d54703 JH |
915 | return 0; |
916 | ||
917 | if (ch && time_before(jiffies, port->sysrq)) { | |
918 | if (sysrq_mask()) { | |
919 | handle_sysrq(ch); | |
920 | port->sysrq = 0; | |
921 | return 1; | |
922 | } | |
923 | if (uart_try_toggle_sysrq(port, ch)) | |
924 | return 1; | |
925 | } | |
926 | port->sysrq = 0; | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
931 | static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch) | |
932 | { | |
22538565 | 933 | if (!port->sysrq) |
08d54703 JH |
934 | return 0; |
935 | ||
936 | if (ch && time_before(jiffies, port->sysrq)) { | |
937 | if (sysrq_mask()) { | |
938 | port->sysrq_ch = ch; | |
939 | port->sysrq = 0; | |
940 | return 1; | |
941 | } | |
942 | if (uart_try_toggle_sysrq(port, ch)) | |
943 | return 1; | |
944 | } | |
945 | port->sysrq = 0; | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
75f4e830 | 950 | static inline void uart_unlock_and_check_sysrq(struct uart_port *port) |
08d54703 JH |
951 | { |
952 | int sysrq_ch; | |
953 | ||
954 | if (!port->has_sysrq) { | |
75f4e830 | 955 | spin_unlock(&port->lock); |
08d54703 JH |
956 | return; |
957 | } | |
958 | ||
959 | sysrq_ch = port->sysrq_ch; | |
960 | port->sysrq_ch = 0; | |
961 | ||
75f4e830 | 962 | spin_unlock(&port->lock); |
08d54703 JH |
963 | |
964 | if (sysrq_ch) | |
965 | handle_sysrq(sysrq_ch); | |
966 | } | |
853a9ae2 JH |
967 | |
968 | static inline void uart_unlock_and_check_sysrq_irqrestore(struct uart_port *port, | |
969 | unsigned long flags) | |
970 | { | |
971 | int sysrq_ch; | |
972 | ||
973 | if (!port->has_sysrq) { | |
974 | spin_unlock_irqrestore(&port->lock, flags); | |
975 | return; | |
976 | } | |
977 | ||
978 | sysrq_ch = port->sysrq_ch; | |
979 | port->sysrq_ch = 0; | |
980 | ||
981 | spin_unlock_irqrestore(&port->lock, flags); | |
982 | ||
983 | if (sysrq_ch) | |
984 | handle_sysrq(sysrq_ch); | |
985 | } | |
08d54703 JH |
986 | #else /* CONFIG_MAGIC_SYSRQ_SERIAL */ |
987 | static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) | |
988 | { | |
989 | return 0; | |
990 | } | |
991 | static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch) | |
992 | { | |
993 | return 0; | |
994 | } | |
75f4e830 | 995 | static inline void uart_unlock_and_check_sysrq(struct uart_port *port) |
08d54703 | 996 | { |
75f4e830 | 997 | spin_unlock(&port->lock); |
08d54703 | 998 | } |
853a9ae2 JH |
999 | static inline void uart_unlock_and_check_sysrq_irqrestore(struct uart_port *port, |
1000 | unsigned long flags) | |
1001 | { | |
1002 | spin_unlock_irqrestore(&port->lock, flags); | |
1003 | } | |
08d54703 JH |
1004 | #endif /* CONFIG_MAGIC_SYSRQ_SERIAL */ |
1005 | ||
1006 | /* | |
1007 | * We do the SysRQ and SAK checking like this... | |
1008 | */ | |
1009 | static inline int uart_handle_break(struct uart_port *port) | |
1010 | { | |
1011 | struct uart_state *state = port->state; | |
1012 | ||
1013 | if (port->handle_break) | |
1014 | port->handle_break(port); | |
1015 | ||
1016 | #ifdef CONFIG_MAGIC_SYSRQ_SERIAL | |
1017 | if (port->has_sysrq && uart_console(port)) { | |
1018 | if (!port->sysrq) { | |
1019 | port->sysrq = jiffies + SYSRQ_TIMEOUT; | |
1020 | return 1; | |
1021 | } | |
1022 | port->sysrq = 0; | |
1023 | } | |
1024 | #endif | |
1025 | if (port->flags & UPF_SAK) | |
1026 | do_SAK(state->port.tty); | |
1027 | return 0; | |
1028 | } | |
1da177e4 | 1029 | |
1da177e4 LT |
1030 | /* |
1031 | * UART_ENABLE_MS - determine if port should enable modem status irqs | |
1032 | */ | |
1033 | #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \ | |
1034 | (cflag) & CRTSCTS || \ | |
1035 | !((cflag) & CLOCAL)) | |
1036 | ||
c150c0f3 | 1037 | int uart_get_rs485_mode(struct uart_port *port); |
1da177e4 | 1038 | #endif /* LINUX_SERIAL_CORE_H */ |