Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0+
2 : /*
3 : * Universal/legacy driver for 8250/16550-type serial ports
4 : *
5 : * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
6 : *
7 : * Copyright (C) 2001 Russell King.
8 : *
9 : * Supports: ISA-compatible 8250/16550 ports
10 : * PNP 8250/16550 ports
11 : * early_serial_setup() ports
12 : * userspace-configurable "phantom" ports
13 : * "serial8250" platform devices
14 : * serial8250_register_8250_port() ports
15 : */
16 :
17 : #include <linux/acpi.h>
18 : #include <linux/module.h>
19 : #include <linux/moduleparam.h>
20 : #include <linux/ioport.h>
21 : #include <linux/init.h>
22 : #include <linux/console.h>
23 : #include <linux/sysrq.h>
24 : #include <linux/delay.h>
25 : #include <linux/platform_device.h>
26 : #include <linux/tty.h>
27 : #include <linux/ratelimit.h>
28 : #include <linux/tty_flip.h>
29 : #include <linux/serial.h>
30 : #include <linux/serial_8250.h>
31 : #include <linux/nmi.h>
32 : #include <linux/mutex.h>
33 : #include <linux/slab.h>
34 : #include <linux/uaccess.h>
35 : #include <linux/pm_runtime.h>
36 : #include <linux/io.h>
37 : #ifdef CONFIG_SPARC
38 : #include <linux/sunserialcore.h>
39 : #endif
40 :
41 : #include <asm/irq.h>
42 :
43 : #include "8250.h"
44 :
45 : /*
46 : * Configuration:
47 : * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option
48 : * is unsafe when used on edge-triggered interrupts.
49 : */
50 : static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
51 :
52 : static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS;
53 :
54 : static struct uart_driver serial8250_reg;
55 :
56 : static unsigned int skip_txen_test; /* force skip of txen test at init time */
57 :
58 : #define PASS_LIMIT 512
59 :
60 : #include <asm/serial.h>
61 : /*
62 : * SERIAL_PORT_DFNS tells us about built-in ports that have no
63 : * standard enumeration mechanism. Platforms that can find all
64 : * serial ports via mechanisms like ACPI or PCI need not supply it.
65 : */
66 : #ifndef SERIAL_PORT_DFNS
67 : #define SERIAL_PORT_DFNS
68 : #endif
69 :
70 : static const struct old_serial_port old_serial_port[] = {
71 : SERIAL_PORT_DFNS /* defined in asm/serial.h */
72 : };
73 :
74 : #define UART_NR CONFIG_SERIAL_8250_NR_UARTS
75 :
76 : #ifdef CONFIG_SERIAL_8250_RSA
77 :
78 : #define PORT_RSA_MAX 4
79 : static unsigned long probe_rsa[PORT_RSA_MAX];
80 : static unsigned int probe_rsa_count;
81 : #endif /* CONFIG_SERIAL_8250_RSA */
82 :
83 : struct irq_info {
84 : struct hlist_node node;
85 : int irq;
86 : spinlock_t lock; /* Protects list not the hash */
87 : struct list_head *head;
88 : };
89 :
90 : #define NR_IRQ_HASH 32 /* Can be adjusted later */
91 : static struct hlist_head irq_lists[NR_IRQ_HASH];
92 : static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */
93 :
94 : /*
95 : * This is the serial driver's interrupt routine.
96 : *
97 : * Arjan thinks the old way was overly complex, so it got simplified.
98 : * Alan disagrees, saying that need the complexity to handle the weird
99 : * nature of ISA shared interrupts. (This is a special exception.)
100 : *
101 : * In order to handle ISA shared interrupts properly, we need to check
102 : * that all ports have been serviced, and therefore the ISA interrupt
103 : * line has been de-asserted.
104 : *
105 : * This means we need to loop through all ports. checking that they
106 : * don't have an interrupt pending.
107 : */
108 379 : static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
109 : {
110 379 : struct irq_info *i = dev_id;
111 379 : struct list_head *l, *end = NULL;
112 379 : int pass_counter = 0, handled = 0;
113 :
114 379 : pr_debug("%s(%d): start\n", __func__, irq);
115 :
116 379 : spin_lock(&i->lock);
117 :
118 379 : l = i->head;
119 1129 : do {
120 1129 : struct uart_8250_port *up;
121 1129 : struct uart_port *port;
122 :
123 1129 : up = list_entry(l, struct uart_8250_port, list);
124 1129 : port = &up->port;
125 :
126 1129 : if (port->handle_irq(port)) {
127 : handled = 1;
128 : end = NULL;
129 379 : } else if (end == NULL)
130 379 : end = l;
131 :
132 1129 : l = l->next;
133 :
134 1129 : if (l == i->head && pass_counter++ > PASS_LIMIT)
135 : break;
136 1129 : } while (l != end);
137 :
138 379 : spin_unlock(&i->lock);
139 :
140 379 : pr_debug("%s(%d): end\n", __func__, irq);
141 :
142 379 : return IRQ_RETVAL(handled);
143 : }
144 :
145 : /*
146 : * To support ISA shared interrupts, we need to have one interrupt
147 : * handler that ensures that the IRQ line has been deasserted
148 : * before returning. Failing to do this will result in the IRQ
149 : * line being stuck active, and, since ISA irqs are edge triggered,
150 : * no more IRQs will be seen.
151 : */
152 0 : static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
153 : {
154 0 : spin_lock_irq(&i->lock);
155 :
156 0 : if (!list_empty(i->head)) {
157 0 : if (i->head == &up->list)
158 0 : i->head = i->head->next;
159 0 : list_del(&up->list);
160 : } else {
161 0 : BUG_ON(i->head != &up->list);
162 0 : i->head = NULL;
163 : }
164 0 : spin_unlock_irq(&i->lock);
165 : /* List empty so throw away the hash node */
166 0 : if (i->head == NULL) {
167 0 : hlist_del(&i->node);
168 0 : kfree(i);
169 : }
170 0 : }
171 :
172 1 : static int serial_link_irq_chain(struct uart_8250_port *up)
173 : {
174 1 : struct hlist_head *h;
175 1 : struct hlist_node *n;
176 1 : struct irq_info *i;
177 1 : int ret;
178 :
179 1 : mutex_lock(&hash_mutex);
180 :
181 1 : h = &irq_lists[up->port.irq % NR_IRQ_HASH];
182 :
183 1 : hlist_for_each(n, h) {
184 0 : i = hlist_entry(n, struct irq_info, node);
185 0 : if (i->irq == up->port.irq)
186 : break;
187 : }
188 :
189 1 : if (n == NULL) {
190 1 : i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
191 1 : if (i == NULL) {
192 0 : mutex_unlock(&hash_mutex);
193 0 : return -ENOMEM;
194 : }
195 1 : spin_lock_init(&i->lock);
196 1 : i->irq = up->port.irq;
197 1 : hlist_add_head(&i->node, h);
198 : }
199 1 : mutex_unlock(&hash_mutex);
200 :
201 1 : spin_lock_irq(&i->lock);
202 :
203 1 : if (i->head) {
204 0 : list_add(&up->list, i->head);
205 0 : spin_unlock_irq(&i->lock);
206 :
207 0 : ret = 0;
208 : } else {
209 1 : INIT_LIST_HEAD(&up->list);
210 1 : i->head = &up->list;
211 1 : spin_unlock_irq(&i->lock);
212 1 : ret = request_irq(up->port.irq, serial8250_interrupt,
213 : up->port.irqflags, up->port.name, i);
214 1 : if (ret < 0)
215 0 : serial_do_unlink(i, up);
216 : }
217 :
218 : return ret;
219 : }
220 :
221 0 : static void serial_unlink_irq_chain(struct uart_8250_port *up)
222 : {
223 : /*
224 : * yes, some broken gcc emit "warning: 'i' may be used uninitialized"
225 : * but no, we are not going to take a patch that assigns NULL below.
226 : */
227 0 : struct irq_info *i;
228 0 : struct hlist_node *n;
229 0 : struct hlist_head *h;
230 :
231 0 : mutex_lock(&hash_mutex);
232 :
233 0 : h = &irq_lists[up->port.irq % NR_IRQ_HASH];
234 :
235 0 : hlist_for_each(n, h) {
236 0 : i = hlist_entry(n, struct irq_info, node);
237 0 : if (i->irq == up->port.irq)
238 : break;
239 : }
240 :
241 0 : BUG_ON(n == NULL);
242 0 : BUG_ON(i->head == NULL);
243 :
244 0 : if (list_empty(i->head))
245 0 : free_irq(up->port.irq, i);
246 :
247 0 : serial_do_unlink(i, up);
248 0 : mutex_unlock(&hash_mutex);
249 0 : }
250 :
251 : /*
252 : * This function is used to handle ports that do not have an
253 : * interrupt. This doesn't work very well for 16450's, but gives
254 : * barely passable results for a 16550A. (Although at the expense
255 : * of much CPU overhead).
256 : */
257 0 : static void serial8250_timeout(struct timer_list *t)
258 : {
259 0 : struct uart_8250_port *up = from_timer(up, t, timer);
260 :
261 0 : up->port.handle_irq(&up->port);
262 0 : mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
263 0 : }
264 :
265 0 : static void serial8250_backup_timeout(struct timer_list *t)
266 : {
267 0 : struct uart_8250_port *up = from_timer(up, t, timer);
268 0 : unsigned int iir, ier = 0, lsr;
269 0 : unsigned long flags;
270 :
271 0 : spin_lock_irqsave(&up->port.lock, flags);
272 :
273 : /*
274 : * Must disable interrupts or else we risk racing with the interrupt
275 : * based handler.
276 : */
277 0 : if (up->port.irq) {
278 0 : ier = serial_in(up, UART_IER);
279 0 : serial_out(up, UART_IER, 0);
280 : }
281 :
282 0 : iir = serial_in(up, UART_IIR);
283 :
284 : /*
285 : * This should be a safe test for anyone who doesn't trust the
286 : * IIR bits on their UART, but it's specifically designed for
287 : * the "Diva" UART used on the management processor on many HP
288 : * ia64 and parisc boxes.
289 : */
290 0 : lsr = serial_in(up, UART_LSR);
291 0 : up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
292 0 : if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
293 0 : (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
294 0 : (lsr & UART_LSR_THRE)) {
295 0 : iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
296 0 : iir |= UART_IIR_THRI;
297 : }
298 :
299 0 : if (!(iir & UART_IIR_NO_INT))
300 0 : serial8250_tx_chars(up);
301 :
302 0 : if (up->port.irq)
303 0 : serial_out(up, UART_IER, ier);
304 :
305 0 : spin_unlock_irqrestore(&up->port.lock, flags);
306 :
307 : /* Standard timer interval plus 0.2s to keep the port running */
308 0 : mod_timer(&up->timer,
309 0 : jiffies + uart_poll_timeout(&up->port) + HZ / 5);
310 0 : }
311 :
312 1 : static int univ8250_setup_irq(struct uart_8250_port *up)
313 : {
314 1 : struct uart_port *port = &up->port;
315 1 : int retval = 0;
316 :
317 : /*
318 : * The above check will only give an accurate result the first time
319 : * the port is opened so this value needs to be preserved.
320 : */
321 1 : if (up->bugs & UART_BUG_THRE) {
322 0 : pr_debug("%s - using backup timer\n", port->name);
323 :
324 0 : up->timer.function = serial8250_backup_timeout;
325 0 : mod_timer(&up->timer, jiffies +
326 0 : uart_poll_timeout(port) + HZ / 5);
327 : }
328 :
329 : /*
330 : * If the "interrupt" for this port doesn't correspond with any
331 : * hardware interrupt, we use a timer-based system. The original
332 : * driver used to do this with IRQ0.
333 : */
334 1 : if (!port->irq) {
335 0 : mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
336 : } else
337 1 : retval = serial_link_irq_chain(up);
338 :
339 1 : return retval;
340 : }
341 :
342 0 : static void univ8250_release_irq(struct uart_8250_port *up)
343 : {
344 0 : struct uart_port *port = &up->port;
345 :
346 0 : del_timer_sync(&up->timer);
347 0 : up->timer.function = serial8250_timeout;
348 0 : if (port->irq)
349 0 : serial_unlink_irq_chain(up);
350 0 : }
351 :
352 : #ifdef CONFIG_SERIAL_8250_RSA
353 : static int serial8250_request_rsa_resource(struct uart_8250_port *up)
354 : {
355 : unsigned long start = UART_RSA_BASE << up->port.regshift;
356 : unsigned int size = 8 << up->port.regshift;
357 : struct uart_port *port = &up->port;
358 : int ret = -EINVAL;
359 :
360 : switch (port->iotype) {
361 : case UPIO_HUB6:
362 : case UPIO_PORT:
363 : start += port->iobase;
364 : if (request_region(start, size, "serial-rsa"))
365 : ret = 0;
366 : else
367 : ret = -EBUSY;
368 : break;
369 : }
370 :
371 : return ret;
372 : }
373 :
374 : static void serial8250_release_rsa_resource(struct uart_8250_port *up)
375 : {
376 : unsigned long offset = UART_RSA_BASE << up->port.regshift;
377 : unsigned int size = 8 << up->port.regshift;
378 : struct uart_port *port = &up->port;
379 :
380 : switch (port->iotype) {
381 : case UPIO_HUB6:
382 : case UPIO_PORT:
383 : release_region(port->iobase + offset, size);
384 : break;
385 : }
386 : }
387 : #endif
388 :
389 : static const struct uart_ops *base_ops;
390 : static struct uart_ops univ8250_port_ops;
391 :
392 : static const struct uart_8250_ops univ8250_driver_ops = {
393 : .setup_irq = univ8250_setup_irq,
394 : .release_irq = univ8250_release_irq,
395 : };
396 :
397 : static struct uart_8250_port serial8250_ports[UART_NR];
398 :
399 : /**
400 : * serial8250_get_port - retrieve struct uart_8250_port
401 : * @line: serial line number
402 : *
403 : * This function retrieves struct uart_8250_port for the specific line.
404 : * This struct *must* *not* be used to perform a 8250 or serial core operation
405 : * which is not accessible otherwise. Its only purpose is to make the struct
406 : * accessible to the runtime-pm callbacks for context suspend/restore.
407 : * The lock assumption made here is none because runtime-pm suspend/resume
408 : * callbacks should not be invoked if there is any operation performed on the
409 : * port.
410 : */
411 0 : struct uart_8250_port *serial8250_get_port(int line)
412 : {
413 0 : return &serial8250_ports[line];
414 : }
415 : EXPORT_SYMBOL_GPL(serial8250_get_port);
416 :
417 : static void (*serial8250_isa_config)(int port, struct uart_port *up,
418 : u32 *capabilities);
419 :
420 0 : void serial8250_set_isa_configurator(
421 : void (*v)(int port, struct uart_port *up, u32 *capabilities))
422 : {
423 0 : serial8250_isa_config = v;
424 0 : }
425 : EXPORT_SYMBOL(serial8250_set_isa_configurator);
426 :
427 : #ifdef CONFIG_SERIAL_8250_RSA
428 :
429 : static void univ8250_config_port(struct uart_port *port, int flags)
430 : {
431 : struct uart_8250_port *up = up_to_u8250p(port);
432 :
433 : up->probe &= ~UART_PROBE_RSA;
434 : if (port->type == PORT_RSA) {
435 : if (serial8250_request_rsa_resource(up) == 0)
436 : up->probe |= UART_PROBE_RSA;
437 : } else if (flags & UART_CONFIG_TYPE) {
438 : int i;
439 :
440 : for (i = 0; i < probe_rsa_count; i++) {
441 : if (probe_rsa[i] == up->port.iobase) {
442 : if (serial8250_request_rsa_resource(up) == 0)
443 : up->probe |= UART_PROBE_RSA;
444 : break;
445 : }
446 : }
447 : }
448 :
449 : base_ops->config_port(port, flags);
450 :
451 : if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA)
452 : serial8250_release_rsa_resource(up);
453 : }
454 :
455 : static int univ8250_request_port(struct uart_port *port)
456 : {
457 : struct uart_8250_port *up = up_to_u8250p(port);
458 : int ret;
459 :
460 : ret = base_ops->request_port(port);
461 : if (ret == 0 && port->type == PORT_RSA) {
462 : ret = serial8250_request_rsa_resource(up);
463 : if (ret < 0)
464 : base_ops->release_port(port);
465 : }
466 :
467 : return ret;
468 : }
469 :
470 : static void univ8250_release_port(struct uart_port *port)
471 : {
472 : struct uart_8250_port *up = up_to_u8250p(port);
473 :
474 : if (port->type == PORT_RSA)
475 : serial8250_release_rsa_resource(up);
476 : base_ops->release_port(port);
477 : }
478 :
479 : static void univ8250_rsa_support(struct uart_ops *ops)
480 : {
481 : ops->config_port = univ8250_config_port;
482 : ops->request_port = univ8250_request_port;
483 : ops->release_port = univ8250_release_port;
484 : }
485 :
486 : #else
487 : #define univ8250_rsa_support(x) do { } while (0)
488 : #endif /* CONFIG_SERIAL_8250_RSA */
489 :
490 4 : static inline void serial8250_apply_quirks(struct uart_8250_port *up)
491 : {
492 8 : up->port.quirks |= skip_txen_test ? UPQ_NO_TXEN_TEST : 0;
493 : }
494 :
495 2 : static void __init serial8250_isa_init_ports(void)
496 : {
497 2 : struct uart_8250_port *up;
498 2 : static int first = 1;
499 2 : int i, irqflag = 0;
500 :
501 2 : if (!first)
502 : return;
503 1 : first = 0;
504 :
505 1 : if (nr_uarts > UART_NR)
506 0 : nr_uarts = UART_NR;
507 :
508 5 : for (i = 0; i < nr_uarts; i++) {
509 4 : struct uart_8250_port *up = &serial8250_ports[i];
510 4 : struct uart_port *port = &up->port;
511 :
512 4 : port->line = i;
513 4 : serial8250_init_port(up);
514 4 : if (!base_ops)
515 1 : base_ops = port->ops;
516 4 : port->ops = &univ8250_port_ops;
517 :
518 4 : timer_setup(&up->timer, serial8250_timeout, 0);
519 :
520 4 : up->ops = &univ8250_driver_ops;
521 :
522 : /*
523 : * ALPHA_KLUDGE_MCR needs to be killed.
524 : */
525 4 : up->mcr_mask = ~ALPHA_KLUDGE_MCR;
526 4 : up->mcr_force = ALPHA_KLUDGE_MCR;
527 4 : serial8250_set_defaults(up);
528 : }
529 :
530 : /* chain base port ops to support Remote Supervisor Adapter */
531 1 : univ8250_port_ops = *base_ops;
532 1 : univ8250_rsa_support(&univ8250_port_ops);
533 :
534 1 : if (share_irqs)
535 0 : irqflag = IRQF_SHARED;
536 :
537 1 : for (i = 0, up = serial8250_ports;
538 5 : i < ARRAY_SIZE(old_serial_port) && i < nr_uarts;
539 4 : i++, up++) {
540 4 : struct uart_port *port = &up->port;
541 :
542 4 : port->iobase = old_serial_port[i].port;
543 4 : port->irq = irq_canonicalize(old_serial_port[i].irq);
544 4 : port->irqflags = 0;
545 4 : port->uartclk = old_serial_port[i].baud_base * 16;
546 4 : port->flags = old_serial_port[i].flags;
547 4 : port->hub6 = 0;
548 4 : port->membase = old_serial_port[i].iomem_base;
549 4 : port->iotype = old_serial_port[i].io_type;
550 4 : port->regshift = old_serial_port[i].iomem_reg_shift;
551 :
552 4 : port->irqflags |= irqflag;
553 4 : if (serial8250_isa_config != NULL)
554 0 : serial8250_isa_config(i, &up->port, &up->capabilities);
555 : }
556 : }
557 :
558 : static void __init
559 1 : serial8250_register_ports(struct uart_driver *drv, struct device *dev)
560 : {
561 1 : int i;
562 :
563 5 : for (i = 0; i < nr_uarts; i++) {
564 4 : struct uart_8250_port *up = &serial8250_ports[i];
565 :
566 4 : if (up->port.type == PORT_8250_CIR)
567 0 : continue;
568 :
569 4 : if (up->port.dev)
570 0 : continue;
571 :
572 4 : up->port.dev = dev;
573 :
574 4 : serial8250_apply_quirks(up);
575 4 : uart_add_one_port(drv, &up->port);
576 : }
577 1 : }
578 :
579 : #ifdef CONFIG_SERIAL_8250_CONSOLE
580 :
581 256 : static void univ8250_console_write(struct console *co, const char *s,
582 : unsigned int count)
583 : {
584 256 : struct uart_8250_port *up = &serial8250_ports[co->index];
585 :
586 256 : serial8250_console_write(up, s, count);
587 256 : }
588 :
589 1 : static int univ8250_console_setup(struct console *co, char *options)
590 : {
591 1 : struct uart_port *port;
592 1 : int retval;
593 :
594 : /*
595 : * Check whether an invalid uart number has been specified, and
596 : * if so, search for the first available port that does have
597 : * console support.
598 : */
599 1 : if (co->index >= nr_uarts)
600 0 : co->index = 0;
601 1 : port = &serial8250_ports[co->index].port;
602 : /* link port to console */
603 1 : port->cons = co;
604 :
605 1 : retval = serial8250_console_setup(port, options, false);
606 1 : if (retval != 0)
607 0 : port->cons = NULL;
608 1 : return retval;
609 : }
610 :
611 0 : static int univ8250_console_exit(struct console *co)
612 : {
613 0 : struct uart_port *port;
614 :
615 0 : port = &serial8250_ports[co->index].port;
616 0 : return serial8250_console_exit(port);
617 : }
618 :
619 : /**
620 : * univ8250_console_match - non-standard console matching
621 : * @co: registering console
622 : * @name: name from console command line
623 : * @idx: index from console command line
624 : * @options: ptr to option string from console command line
625 : *
626 : * Only attempts to match console command lines of the form:
627 : * console=uart[8250],io|mmio|mmio16|mmio32,<addr>[,<options>]
628 : * console=uart[8250],0x<addr>[,<options>]
629 : * This form is used to register an initial earlycon boot console and
630 : * replace it with the serial8250_console at 8250 driver init.
631 : *
632 : * Performs console setup for a match (as required by interface)
633 : * If no <options> are specified, then assume the h/w is already setup.
634 : *
635 : * Returns 0 if console matches; otherwise non-zero to use default matching
636 : */
637 1 : static int univ8250_console_match(struct console *co, char *name, int idx,
638 : char *options)
639 : {
640 1 : char match[] = "uart"; /* 8250-specific earlycon name */
641 1 : unsigned char iotype;
642 1 : resource_size_t addr;
643 1 : int i;
644 :
645 1 : if (strncmp(name, match, 4) != 0)
646 : return -ENODEV;
647 :
648 0 : if (uart_parse_earlycon(options, &iotype, &addr, &options))
649 : return -ENODEV;
650 :
651 : /* try to match the port specified on the command line */
652 0 : for (i = 0; i < nr_uarts; i++) {
653 0 : struct uart_port *port = &serial8250_ports[i].port;
654 :
655 0 : if (port->iotype != iotype)
656 0 : continue;
657 0 : if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 ||
658 0 : iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE)
659 0 : && (port->mapbase != addr))
660 0 : continue;
661 0 : if (iotype == UPIO_PORT && port->iobase != addr)
662 0 : continue;
663 :
664 0 : co->index = i;
665 0 : port->cons = co;
666 0 : return serial8250_console_setup(port, options, true);
667 : }
668 :
669 : return -ENODEV;
670 : }
671 :
672 : static struct console univ8250_console = {
673 : .name = "ttyS",
674 : .write = univ8250_console_write,
675 : .device = uart_console_device,
676 : .setup = univ8250_console_setup,
677 : .exit = univ8250_console_exit,
678 : .match = univ8250_console_match,
679 : .flags = CON_PRINTBUFFER | CON_ANYTIME,
680 : .index = -1,
681 : .data = &serial8250_reg,
682 : };
683 :
684 1 : static int __init univ8250_console_init(void)
685 : {
686 1 : if (nr_uarts == 0)
687 : return -ENODEV;
688 :
689 1 : serial8250_isa_init_ports();
690 1 : register_console(&univ8250_console);
691 1 : return 0;
692 : }
693 : console_initcall(univ8250_console_init);
694 :
695 : #define SERIAL8250_CONSOLE (&univ8250_console)
696 : #else
697 : #define SERIAL8250_CONSOLE NULL
698 : #endif
699 :
700 : static struct uart_driver serial8250_reg = {
701 : .owner = THIS_MODULE,
702 : .driver_name = "serial",
703 : .dev_name = "ttyS",
704 : .major = TTY_MAJOR,
705 : .minor = 64,
706 : .cons = SERIAL8250_CONSOLE,
707 : };
708 :
709 : /*
710 : * early_serial_setup - early registration for 8250 ports
711 : *
712 : * Setup an 8250 port structure prior to console initialisation. Use
713 : * after console initialisation will cause undefined behaviour.
714 : */
715 0 : int __init early_serial_setup(struct uart_port *port)
716 : {
717 0 : struct uart_port *p;
718 :
719 0 : if (port->line >= ARRAY_SIZE(serial8250_ports) || nr_uarts == 0)
720 : return -ENODEV;
721 :
722 0 : serial8250_isa_init_ports();
723 0 : p = &serial8250_ports[port->line].port;
724 0 : p->iobase = port->iobase;
725 0 : p->membase = port->membase;
726 0 : p->irq = port->irq;
727 0 : p->irqflags = port->irqflags;
728 0 : p->uartclk = port->uartclk;
729 0 : p->fifosize = port->fifosize;
730 0 : p->regshift = port->regshift;
731 0 : p->iotype = port->iotype;
732 0 : p->flags = port->flags;
733 0 : p->mapbase = port->mapbase;
734 0 : p->mapsize = port->mapsize;
735 0 : p->private_data = port->private_data;
736 0 : p->type = port->type;
737 0 : p->line = port->line;
738 :
739 0 : serial8250_set_defaults(up_to_u8250p(p));
740 :
741 0 : if (port->serial_in)
742 0 : p->serial_in = port->serial_in;
743 0 : if (port->serial_out)
744 0 : p->serial_out = port->serial_out;
745 0 : if (port->handle_irq)
746 0 : p->handle_irq = port->handle_irq;
747 :
748 : return 0;
749 : }
750 :
751 : /**
752 : * serial8250_suspend_port - suspend one serial port
753 : * @line: serial line number
754 : *
755 : * Suspend one serial port.
756 : */
757 0 : void serial8250_suspend_port(int line)
758 : {
759 0 : struct uart_8250_port *up = &serial8250_ports[line];
760 0 : struct uart_port *port = &up->port;
761 :
762 0 : if (!console_suspend_enabled && uart_console(port) &&
763 0 : port->type != PORT_8250) {
764 0 : unsigned char canary = 0xa5;
765 0 : serial_out(up, UART_SCR, canary);
766 0 : if (serial_in(up, UART_SCR) == canary)
767 0 : up->canary = canary;
768 : }
769 :
770 0 : uart_suspend_port(&serial8250_reg, port);
771 0 : }
772 : EXPORT_SYMBOL(serial8250_suspend_port);
773 :
774 : /**
775 : * serial8250_resume_port - resume one serial port
776 : * @line: serial line number
777 : *
778 : * Resume one serial port.
779 : */
780 0 : void serial8250_resume_port(int line)
781 : {
782 0 : struct uart_8250_port *up = &serial8250_ports[line];
783 0 : struct uart_port *port = &up->port;
784 :
785 0 : up->canary = 0;
786 :
787 0 : if (up->capabilities & UART_NATSEMI) {
788 : /* Ensure it's still in high speed mode */
789 0 : serial_port_out(port, UART_LCR, 0xE0);
790 :
791 0 : ns16550a_goto_highspeed(up);
792 :
793 0 : serial_port_out(port, UART_LCR, 0);
794 0 : port->uartclk = 921600*16;
795 : }
796 0 : uart_resume_port(&serial8250_reg, port);
797 0 : }
798 : EXPORT_SYMBOL(serial8250_resume_port);
799 :
800 : /*
801 : * Register a set of serial devices attached to a platform device. The
802 : * list is terminated with a zero flags entry, which means we expect
803 : * all entries to have at least UPF_BOOT_AUTOCONF set.
804 : */
805 1 : static int serial8250_probe(struct platform_device *dev)
806 : {
807 1 : struct plat_serial8250_port *p = dev_get_platdata(&dev->dev);
808 1 : struct uart_8250_port uart;
809 1 : int ret, i, irqflag = 0;
810 :
811 1 : memset(&uart, 0, sizeof(uart));
812 :
813 1 : if (share_irqs)
814 0 : irqflag = IRQF_SHARED;
815 :
816 1 : for (i = 0; p && p->flags != 0; p++, i++) {
817 0 : uart.port.iobase = p->iobase;
818 0 : uart.port.membase = p->membase;
819 0 : uart.port.irq = p->irq;
820 0 : uart.port.irqflags = p->irqflags;
821 0 : uart.port.uartclk = p->uartclk;
822 0 : uart.port.regshift = p->regshift;
823 0 : uart.port.iotype = p->iotype;
824 0 : uart.port.flags = p->flags;
825 0 : uart.port.mapbase = p->mapbase;
826 0 : uart.port.hub6 = p->hub6;
827 0 : uart.port.has_sysrq = p->has_sysrq;
828 0 : uart.port.private_data = p->private_data;
829 0 : uart.port.type = p->type;
830 0 : uart.port.serial_in = p->serial_in;
831 0 : uart.port.serial_out = p->serial_out;
832 0 : uart.port.handle_irq = p->handle_irq;
833 0 : uart.port.handle_break = p->handle_break;
834 0 : uart.port.set_termios = p->set_termios;
835 0 : uart.port.set_ldisc = p->set_ldisc;
836 0 : uart.port.get_mctrl = p->get_mctrl;
837 0 : uart.port.pm = p->pm;
838 0 : uart.port.dev = &dev->dev;
839 0 : uart.port.irqflags |= irqflag;
840 0 : ret = serial8250_register_8250_port(&uart);
841 0 : if (ret < 0) {
842 0 : dev_err(&dev->dev, "unable to register port at index %d "
843 : "(IO%lx MEM%llx IRQ%d): %d\n", i,
844 : p->iobase, (unsigned long long)p->mapbase,
845 : p->irq, ret);
846 : }
847 : }
848 1 : return 0;
849 : }
850 :
851 : /*
852 : * Remove serial ports registered against a platform device.
853 : */
854 0 : static int serial8250_remove(struct platform_device *dev)
855 : {
856 0 : int i;
857 :
858 0 : for (i = 0; i < nr_uarts; i++) {
859 0 : struct uart_8250_port *up = &serial8250_ports[i];
860 :
861 0 : if (up->port.dev == &dev->dev)
862 0 : serial8250_unregister_port(i);
863 : }
864 0 : return 0;
865 : }
866 :
867 0 : static int serial8250_suspend(struct platform_device *dev, pm_message_t state)
868 : {
869 0 : int i;
870 :
871 0 : for (i = 0; i < UART_NR; i++) {
872 0 : struct uart_8250_port *up = &serial8250_ports[i];
873 :
874 0 : if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
875 0 : uart_suspend_port(&serial8250_reg, &up->port);
876 : }
877 :
878 0 : return 0;
879 : }
880 :
881 0 : static int serial8250_resume(struct platform_device *dev)
882 : {
883 0 : int i;
884 :
885 0 : for (i = 0; i < UART_NR; i++) {
886 0 : struct uart_8250_port *up = &serial8250_ports[i];
887 :
888 0 : if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
889 0 : serial8250_resume_port(i);
890 : }
891 :
892 0 : return 0;
893 : }
894 :
895 : static struct platform_driver serial8250_isa_driver = {
896 : .probe = serial8250_probe,
897 : .remove = serial8250_remove,
898 : .suspend = serial8250_suspend,
899 : .resume = serial8250_resume,
900 : .driver = {
901 : .name = "serial8250",
902 : },
903 : };
904 :
905 : /*
906 : * This "device" covers _all_ ISA 8250-compatible serial devices listed
907 : * in the table in include/asm/serial.h
908 : */
909 : static struct platform_device *serial8250_isa_devs;
910 :
911 : /*
912 : * serial8250_register_8250_port and serial8250_unregister_port allows for
913 : * 16x50 serial ports to be configured at run-time, to support PCMCIA
914 : * modems and PCI multiport cards.
915 : */
916 : static DEFINE_MUTEX(serial_mutex);
917 :
918 0 : static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port)
919 : {
920 0 : int i;
921 :
922 : /*
923 : * First, find a port entry which matches.
924 : */
925 0 : for (i = 0; i < nr_uarts; i++)
926 0 : if (uart_match_port(&serial8250_ports[i].port, port))
927 0 : return &serial8250_ports[i];
928 :
929 : /* try line number first if still available */
930 0 : i = port->line;
931 0 : if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN &&
932 0 : serial8250_ports[i].port.iobase == 0)
933 0 : return &serial8250_ports[i];
934 : /*
935 : * We didn't find a matching entry, so look for the first
936 : * free entry. We look for one which hasn't been previously
937 : * used (indicated by zero iobase).
938 : */
939 0 : for (i = 0; i < nr_uarts; i++)
940 0 : if (serial8250_ports[i].port.type == PORT_UNKNOWN &&
941 0 : serial8250_ports[i].port.iobase == 0)
942 0 : return &serial8250_ports[i];
943 :
944 : /*
945 : * That also failed. Last resort is to find any entry which
946 : * doesn't have a real port associated with it.
947 : */
948 0 : for (i = 0; i < nr_uarts; i++)
949 0 : if (serial8250_ports[i].port.type == PORT_UNKNOWN)
950 0 : return &serial8250_ports[i];
951 :
952 : return NULL;
953 : }
954 :
955 0 : static void serial_8250_overrun_backoff_work(struct work_struct *work)
956 : {
957 0 : struct uart_8250_port *up =
958 0 : container_of(to_delayed_work(work), struct uart_8250_port,
959 : overrun_backoff);
960 0 : struct uart_port *port = &up->port;
961 0 : unsigned long flags;
962 :
963 0 : spin_lock_irqsave(&port->lock, flags);
964 0 : up->ier |= UART_IER_RLSI | UART_IER_RDI;
965 0 : up->port.read_status_mask |= UART_LSR_DR;
966 0 : serial_out(up, UART_IER, up->ier);
967 0 : spin_unlock_irqrestore(&port->lock, flags);
968 0 : }
969 :
970 : /**
971 : * serial8250_register_8250_port - register a serial port
972 : * @up: serial port template
973 : *
974 : * Configure the serial port specified by the request. If the
975 : * port exists and is in use, it is hung up and unregistered
976 : * first.
977 : *
978 : * The port is then probed and if necessary the IRQ is autodetected
979 : * If this fails an error is returned.
980 : *
981 : * On success the port is ready to use and the line number is returned.
982 : */
983 0 : int serial8250_register_8250_port(struct uart_8250_port *up)
984 : {
985 0 : struct uart_8250_port *uart;
986 0 : int ret = -ENOSPC;
987 :
988 0 : if (up->port.uartclk == 0)
989 : return -EINVAL;
990 :
991 0 : mutex_lock(&serial_mutex);
992 :
993 0 : uart = serial8250_find_match_or_unused(&up->port);
994 0 : if (uart && uart->port.type != PORT_8250_CIR) {
995 0 : struct mctrl_gpios *gpios;
996 :
997 0 : if (uart->port.dev)
998 0 : uart_remove_one_port(&serial8250_reg, &uart->port);
999 :
1000 0 : uart->port.iobase = up->port.iobase;
1001 0 : uart->port.membase = up->port.membase;
1002 0 : uart->port.irq = up->port.irq;
1003 0 : uart->port.irqflags = up->port.irqflags;
1004 0 : uart->port.uartclk = up->port.uartclk;
1005 0 : uart->port.fifosize = up->port.fifosize;
1006 0 : uart->port.regshift = up->port.regshift;
1007 0 : uart->port.iotype = up->port.iotype;
1008 0 : uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF;
1009 0 : uart->bugs = up->bugs;
1010 0 : uart->port.mapbase = up->port.mapbase;
1011 0 : uart->port.mapsize = up->port.mapsize;
1012 0 : uart->port.private_data = up->port.private_data;
1013 0 : uart->tx_loadsz = up->tx_loadsz;
1014 0 : uart->capabilities = up->capabilities;
1015 0 : uart->port.throttle = up->port.throttle;
1016 0 : uart->port.unthrottle = up->port.unthrottle;
1017 0 : uart->port.rs485_config = up->port.rs485_config;
1018 0 : uart->port.rs485 = up->port.rs485;
1019 0 : uart->rs485_start_tx = up->rs485_start_tx;
1020 0 : uart->rs485_stop_tx = up->rs485_stop_tx;
1021 0 : uart->dma = up->dma;
1022 :
1023 : /* Take tx_loadsz from fifosize if it wasn't set separately */
1024 0 : if (uart->port.fifosize && !uart->tx_loadsz)
1025 0 : uart->tx_loadsz = uart->port.fifosize;
1026 :
1027 0 : if (up->port.dev) {
1028 0 : uart->port.dev = up->port.dev;
1029 0 : ret = uart_get_rs485_mode(&uart->port);
1030 0 : if (ret)
1031 0 : goto err;
1032 : }
1033 :
1034 0 : if (up->port.flags & UPF_FIXED_TYPE)
1035 0 : uart->port.type = up->port.type;
1036 :
1037 : /*
1038 : * Only call mctrl_gpio_init(), if the device has no ACPI
1039 : * companion device
1040 : */
1041 0 : if (!has_acpi_companion(uart->port.dev)) {
1042 0 : gpios = mctrl_gpio_init(&uart->port, 0);
1043 0 : if (IS_ERR(gpios)) {
1044 : ret = PTR_ERR(gpios);
1045 : goto err;
1046 : } else {
1047 0 : uart->gpios = gpios;
1048 : }
1049 : }
1050 :
1051 0 : serial8250_set_defaults(uart);
1052 :
1053 : /* Possibly override default I/O functions. */
1054 0 : if (up->port.serial_in)
1055 0 : uart->port.serial_in = up->port.serial_in;
1056 0 : if (up->port.serial_out)
1057 0 : uart->port.serial_out = up->port.serial_out;
1058 0 : if (up->port.handle_irq)
1059 0 : uart->port.handle_irq = up->port.handle_irq;
1060 : /* Possibly override set_termios call */
1061 0 : if (up->port.set_termios)
1062 0 : uart->port.set_termios = up->port.set_termios;
1063 0 : if (up->port.set_ldisc)
1064 0 : uart->port.set_ldisc = up->port.set_ldisc;
1065 0 : if (up->port.get_mctrl)
1066 0 : uart->port.get_mctrl = up->port.get_mctrl;
1067 0 : if (up->port.set_mctrl)
1068 0 : uart->port.set_mctrl = up->port.set_mctrl;
1069 0 : if (up->port.get_divisor)
1070 0 : uart->port.get_divisor = up->port.get_divisor;
1071 0 : if (up->port.set_divisor)
1072 0 : uart->port.set_divisor = up->port.set_divisor;
1073 0 : if (up->port.startup)
1074 0 : uart->port.startup = up->port.startup;
1075 0 : if (up->port.shutdown)
1076 0 : uart->port.shutdown = up->port.shutdown;
1077 0 : if (up->port.pm)
1078 0 : uart->port.pm = up->port.pm;
1079 0 : if (up->port.handle_break)
1080 0 : uart->port.handle_break = up->port.handle_break;
1081 0 : if (up->dl_read)
1082 0 : uart->dl_read = up->dl_read;
1083 0 : if (up->dl_write)
1084 0 : uart->dl_write = up->dl_write;
1085 :
1086 0 : if (uart->port.type != PORT_8250_CIR) {
1087 0 : if (serial8250_isa_config != NULL)
1088 0 : serial8250_isa_config(0, &uart->port,
1089 : &uart->capabilities);
1090 :
1091 0 : serial8250_apply_quirks(uart);
1092 0 : ret = uart_add_one_port(&serial8250_reg,
1093 : &uart->port);
1094 0 : if (ret)
1095 0 : goto err;
1096 :
1097 0 : ret = uart->port.line;
1098 : } else {
1099 0 : dev_info(uart->port.dev,
1100 : "skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n",
1101 : uart->port.iobase,
1102 : (unsigned long long)uart->port.mapbase,
1103 : uart->port.irq);
1104 :
1105 0 : ret = 0;
1106 : }
1107 :
1108 : /* Initialise interrupt backoff work if required */
1109 0 : if (up->overrun_backoff_time_ms > 0) {
1110 0 : uart->overrun_backoff_time_ms =
1111 : up->overrun_backoff_time_ms;
1112 0 : INIT_DELAYED_WORK(&uart->overrun_backoff,
1113 : serial_8250_overrun_backoff_work);
1114 : } else {
1115 0 : uart->overrun_backoff_time_ms = 0;
1116 : }
1117 : }
1118 :
1119 0 : mutex_unlock(&serial_mutex);
1120 :
1121 0 : return ret;
1122 :
1123 0 : err:
1124 0 : uart->port.dev = NULL;
1125 0 : mutex_unlock(&serial_mutex);
1126 0 : return ret;
1127 : }
1128 : EXPORT_SYMBOL(serial8250_register_8250_port);
1129 :
1130 : /**
1131 : * serial8250_unregister_port - remove a 16x50 serial port at runtime
1132 : * @line: serial line number
1133 : *
1134 : * Remove one serial port. This may not be called from interrupt
1135 : * context. We hand the port back to the our control.
1136 : */
1137 0 : void serial8250_unregister_port(int line)
1138 : {
1139 0 : struct uart_8250_port *uart = &serial8250_ports[line];
1140 :
1141 0 : mutex_lock(&serial_mutex);
1142 :
1143 0 : if (uart->em485) {
1144 0 : unsigned long flags;
1145 :
1146 0 : spin_lock_irqsave(&uart->port.lock, flags);
1147 0 : serial8250_em485_destroy(uart);
1148 0 : spin_unlock_irqrestore(&uart->port.lock, flags);
1149 : }
1150 :
1151 0 : uart_remove_one_port(&serial8250_reg, &uart->port);
1152 0 : if (serial8250_isa_devs) {
1153 0 : uart->port.flags &= ~UPF_BOOT_AUTOCONF;
1154 0 : uart->port.type = PORT_UNKNOWN;
1155 0 : uart->port.dev = &serial8250_isa_devs->dev;
1156 0 : uart->capabilities = 0;
1157 0 : serial8250_apply_quirks(uart);
1158 0 : uart_add_one_port(&serial8250_reg, &uart->port);
1159 : } else {
1160 0 : uart->port.dev = NULL;
1161 : }
1162 0 : mutex_unlock(&serial_mutex);
1163 0 : }
1164 : EXPORT_SYMBOL(serial8250_unregister_port);
1165 :
1166 1 : static int __init serial8250_init(void)
1167 : {
1168 1 : int ret;
1169 :
1170 1 : if (nr_uarts == 0)
1171 : return -ENODEV;
1172 :
1173 1 : serial8250_isa_init_ports();
1174 :
1175 2 : pr_info("Serial: 8250/16550 driver, %d ports, IRQ sharing %sabled\n",
1176 : nr_uarts, share_irqs ? "en" : "dis");
1177 :
1178 : #ifdef CONFIG_SPARC
1179 : ret = sunserial_register_minors(&serial8250_reg, UART_NR);
1180 : #else
1181 1 : serial8250_reg.nr = UART_NR;
1182 1 : ret = uart_register_driver(&serial8250_reg);
1183 : #endif
1184 1 : if (ret)
1185 0 : goto out;
1186 :
1187 1 : ret = serial8250_pnp_init();
1188 1 : if (ret)
1189 : goto unreg_uart_drv;
1190 :
1191 1 : serial8250_isa_devs = platform_device_alloc("serial8250",
1192 : PLAT8250_DEV_LEGACY);
1193 1 : if (!serial8250_isa_devs) {
1194 0 : ret = -ENOMEM;
1195 0 : goto unreg_pnp;
1196 : }
1197 :
1198 1 : ret = platform_device_add(serial8250_isa_devs);
1199 1 : if (ret)
1200 0 : goto put_dev;
1201 :
1202 1 : serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev);
1203 :
1204 1 : ret = platform_driver_register(&serial8250_isa_driver);
1205 1 : if (ret == 0)
1206 1 : goto out;
1207 :
1208 0 : platform_device_del(serial8250_isa_devs);
1209 0 : put_dev:
1210 0 : platform_device_put(serial8250_isa_devs);
1211 0 : unreg_pnp:
1212 0 : serial8250_pnp_exit();
1213 0 : unreg_uart_drv:
1214 : #ifdef CONFIG_SPARC
1215 : sunserial_unregister_minors(&serial8250_reg, UART_NR);
1216 : #else
1217 0 : uart_unregister_driver(&serial8250_reg);
1218 : #endif
1219 : out:
1220 : return ret;
1221 : }
1222 :
1223 0 : static void __exit serial8250_exit(void)
1224 : {
1225 0 : struct platform_device *isa_dev = serial8250_isa_devs;
1226 :
1227 : /*
1228 : * This tells serial8250_unregister_port() not to re-register
1229 : * the ports (thereby making serial8250_isa_driver permanently
1230 : * in use.)
1231 : */
1232 0 : serial8250_isa_devs = NULL;
1233 :
1234 0 : platform_driver_unregister(&serial8250_isa_driver);
1235 0 : platform_device_unregister(isa_dev);
1236 :
1237 0 : serial8250_pnp_exit();
1238 :
1239 : #ifdef CONFIG_SPARC
1240 : sunserial_unregister_minors(&serial8250_reg, UART_NR);
1241 : #else
1242 0 : uart_unregister_driver(&serial8250_reg);
1243 : #endif
1244 0 : }
1245 :
1246 : module_init(serial8250_init);
1247 : module_exit(serial8250_exit);
1248 :
1249 : MODULE_LICENSE("GPL");
1250 : MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");
1251 :
1252 : module_param_hw(share_irqs, uint, other, 0644);
1253 : MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices (unsafe)");
1254 :
1255 : module_param(nr_uarts, uint, 0644);
1256 : MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");
1257 :
1258 : module_param(skip_txen_test, uint, 0644);
1259 : MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");
1260 :
1261 : #ifdef CONFIG_SERIAL_8250_RSA
1262 : module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
1263 : MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
1264 : #endif
1265 : MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);
1266 :
1267 : #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
1268 : #ifndef MODULE
1269 : /* This module was renamed to 8250_core in 3.7. Keep the old "8250" name
1270 : * working as well for the module options so we don't break people. We
1271 : * need to keep the names identical and the convenient macros will happily
1272 : * refuse to let us do that by failing the build with redefinition errors
1273 : * of global variables. So we stick them inside a dummy function to avoid
1274 : * those conflicts. The options still get parsed, and the redefined
1275 : * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive.
1276 : *
1277 : * This is hacky. I'm sorry.
1278 : */
1279 : static void __used s8250_options(void)
1280 : {
1281 : #undef MODULE_PARAM_PREFIX
1282 : #define MODULE_PARAM_PREFIX "8250_core."
1283 :
1284 : module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644);
1285 : module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644);
1286 : module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644);
1287 : #ifdef CONFIG_SERIAL_8250_RSA
1288 : __module_param_call(MODULE_PARAM_PREFIX, probe_rsa,
1289 : ¶m_array_ops, .arr = &__param_arr_probe_rsa,
1290 : 0444, -1, 0);
1291 : #endif
1292 : }
1293 : #else
1294 : MODULE_ALIAS("8250_core");
1295 : #endif
1296 : #endif
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