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17#include <linux/module.h>
18#include <linux/moduleparam.h>
19#include <linux/ioport.h>
20#include <linux/init.h>
21#include <linux/console.h>
22#include <linux/sysrq.h>
23#include <linux/delay.h>
24#include <linux/platform_device.h>
25#include <linux/tty.h>
26#include <linux/ratelimit.h>
27#include <linux/tty_flip.h>
28#include <linux/serial.h>
29#include <linux/serial_8250.h>
30#include <linux/nmi.h>
31#include <linux/mutex.h>
32#include <linux/slab.h>
33#include <linux/uaccess.h>
34#include <linux/pm_runtime.h>
35#include <linux/io.h>
36#ifdef CONFIG_SPARC
37#include <linux/sunserialcore.h>
38#endif
39
40#include <asm/irq.h>
41
42#include "8250.h"
43
44
45
46
47
48
49static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
50
51static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS;
52
53static struct uart_driver serial8250_reg;
54
55static unsigned int skip_txen_test;
56
57#define PASS_LIMIT 512
58
59#include <asm/serial.h>
60
61
62
63
64
65#ifndef SERIAL_PORT_DFNS
66#define SERIAL_PORT_DFNS
67#endif
68
69static const struct old_serial_port old_serial_port[] = {
70 SERIAL_PORT_DFNS
71};
72
73#define UART_NR CONFIG_SERIAL_8250_NR_UARTS
74
75#ifdef CONFIG_SERIAL_8250_RSA
76
77#define PORT_RSA_MAX 4
78static unsigned long probe_rsa[PORT_RSA_MAX];
79static unsigned int probe_rsa_count;
80#endif
81
82struct irq_info {
83 struct hlist_node node;
84 int irq;
85 spinlock_t lock;
86 struct list_head *head;
87};
88
89#define NR_IRQ_HASH 32
90static struct hlist_head irq_lists[NR_IRQ_HASH];
91static DEFINE_MUTEX(hash_mutex);
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
108{
109 struct irq_info *i = dev_id;
110 struct list_head *l, *end = NULL;
111 int pass_counter = 0, handled = 0;
112
113 pr_debug("%s(%d): start\n", __func__, irq);
114
115 spin_lock(&i->lock);
116
117 l = i->head;
118 do {
119 struct uart_8250_port *up;
120 struct uart_port *port;
121
122 up = list_entry(l, struct uart_8250_port, list);
123 port = &up->port;
124
125 if (port->handle_irq(port)) {
126 handled = 1;
127 end = NULL;
128 } else if (end == NULL)
129 end = l;
130
131 l = l->next;
132
133 if (l == i->head && pass_counter++ > PASS_LIMIT) {
134
135 printk_ratelimited(KERN_ERR
136 "serial8250: too much work for irq%d\n", irq);
137 break;
138 }
139 } while (l != end);
140
141 spin_unlock(&i->lock);
142
143 pr_debug("%s(%d): end\n", __func__, irq);
144
145 return IRQ_RETVAL(handled);
146}
147
148
149
150
151
152
153
154
155static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
156{
157 spin_lock_irq(&i->lock);
158
159 if (!list_empty(i->head)) {
160 if (i->head == &up->list)
161 i->head = i->head->next;
162 list_del(&up->list);
163 } else {
164 BUG_ON(i->head != &up->list);
165 i->head = NULL;
166 }
167 spin_unlock_irq(&i->lock);
168
169 if (i->head == NULL) {
170 hlist_del(&i->node);
171 kfree(i);
172 }
173}
174
175static int serial_link_irq_chain(struct uart_8250_port *up)
176{
177 struct hlist_head *h;
178 struct hlist_node *n;
179 struct irq_info *i;
180 int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
181
182 mutex_lock(&hash_mutex);
183
184 h = &irq_lists[up->port.irq % NR_IRQ_HASH];
185
186 hlist_for_each(n, h) {
187 i = hlist_entry(n, struct irq_info, node);
188 if (i->irq == up->port.irq)
189 break;
190 }
191
192 if (n == NULL) {
193 i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
194 if (i == NULL) {
195 mutex_unlock(&hash_mutex);
196 return -ENOMEM;
197 }
198 spin_lock_init(&i->lock);
199 i->irq = up->port.irq;
200 hlist_add_head(&i->node, h);
201 }
202 mutex_unlock(&hash_mutex);
203
204 spin_lock_irq(&i->lock);
205
206 if (i->head) {
207 list_add(&up->list, i->head);
208 spin_unlock_irq(&i->lock);
209
210 ret = 0;
211 } else {
212 INIT_LIST_HEAD(&up->list);
213 i->head = &up->list;
214 spin_unlock_irq(&i->lock);
215 irq_flags |= up->port.irqflags;
216 ret = request_irq(up->port.irq, serial8250_interrupt,
217 irq_flags, up->port.name, i);
218 if (ret < 0)
219 serial_do_unlink(i, up);
220 }
221
222 return ret;
223}
224
225static void serial_unlink_irq_chain(struct uart_8250_port *up)
226{
227
228
229
230
231 struct irq_info *i;
232 struct hlist_node *n;
233 struct hlist_head *h;
234
235 mutex_lock(&hash_mutex);
236
237 h = &irq_lists[up->port.irq % NR_IRQ_HASH];
238
239 hlist_for_each(n, h) {
240 i = hlist_entry(n, struct irq_info, node);
241 if (i->irq == up->port.irq)
242 break;
243 }
244
245 BUG_ON(n == NULL);
246 BUG_ON(i->head == NULL);
247
248 if (list_empty(i->head))
249 free_irq(up->port.irq, i);
250
251 serial_do_unlink(i, up);
252 mutex_unlock(&hash_mutex);
253}
254
255
256
257
258
259
260
261static void serial8250_timeout(struct timer_list *t)
262{
263 struct uart_8250_port *up = from_timer(up, t, timer);
264
265 up->port.handle_irq(&up->port);
266 mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
267}
268
269static void serial8250_backup_timeout(struct timer_list *t)
270{
271 struct uart_8250_port *up = from_timer(up, t, timer);
272 unsigned int iir, ier = 0, lsr;
273 unsigned long flags;
274
275 spin_lock_irqsave(&up->port.lock, flags);
276
277
278
279
280
281 if (up->port.irq) {
282 ier = serial_in(up, UART_IER);
283 serial_out(up, UART_IER, 0);
284 }
285
286 iir = serial_in(up, UART_IIR);
287
288
289
290
291
292
293
294 lsr = serial_in(up, UART_LSR);
295 up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
296 if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
297 (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
298 (lsr & UART_LSR_THRE)) {
299 iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
300 iir |= UART_IIR_THRI;
301 }
302
303 if (!(iir & UART_IIR_NO_INT))
304 serial8250_tx_chars(up);
305
306 if (up->port.irq)
307 serial_out(up, UART_IER, ier);
308
309 spin_unlock_irqrestore(&up->port.lock, flags);
310
311
312 mod_timer(&up->timer,
313 jiffies + uart_poll_timeout(&up->port) + HZ / 5);
314}
315
316static int univ8250_setup_irq(struct uart_8250_port *up)
317{
318 struct uart_port *port = &up->port;
319 int retval = 0;
320
321
322
323
324
325 if (up->bugs & UART_BUG_THRE) {
326 pr_debug("ttyS%d - using backup timer\n", serial_index(port));
327
328 up->timer.function = serial8250_backup_timeout;
329 mod_timer(&up->timer, jiffies +
330 uart_poll_timeout(port) + HZ / 5);
331 }
332
333
334
335
336
337
338 if (!port->irq) {
339 mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
340 } else
341 retval = serial_link_irq_chain(up);
342
343 return retval;
344}
345
346static void univ8250_release_irq(struct uart_8250_port *up)
347{
348 struct uart_port *port = &up->port;
349
350 del_timer_sync(&up->timer);
351 up->timer.function = serial8250_timeout;
352 if (port->irq)
353 serial_unlink_irq_chain(up);
354}
355
356#ifdef CONFIG_SERIAL_8250_RSA
357static int serial8250_request_rsa_resource(struct uart_8250_port *up)
358{
359 unsigned long start = UART_RSA_BASE << up->port.regshift;
360 unsigned int size = 8 << up->port.regshift;
361 struct uart_port *port = &up->port;
362 int ret = -EINVAL;
363
364 switch (port->iotype) {
365 case UPIO_HUB6:
366 case UPIO_PORT:
367 start += port->iobase;
368 if (request_region(start, size, "serial-rsa"))
369 ret = 0;
370 else
371 ret = -EBUSY;
372 break;
373 }
374
375 return ret;
376}
377
378static void serial8250_release_rsa_resource(struct uart_8250_port *up)
379{
380 unsigned long offset = UART_RSA_BASE << up->port.regshift;
381 unsigned int size = 8 << up->port.regshift;
382 struct uart_port *port = &up->port;
383
384 switch (port->iotype) {
385 case UPIO_HUB6:
386 case UPIO_PORT:
387 release_region(port->iobase + offset, size);
388 break;
389 }
390}
391#endif
392
393static const struct uart_ops *base_ops;
394static struct uart_ops univ8250_port_ops;
395
396static const struct uart_8250_ops univ8250_driver_ops = {
397 .setup_irq = univ8250_setup_irq,
398 .release_irq = univ8250_release_irq,
399};
400
401static struct uart_8250_port serial8250_ports[UART_NR];
402
403
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410
411
412
413
414
415struct uart_8250_port *serial8250_get_port(int line)
416{
417 return &serial8250_ports[line];
418}
419EXPORT_SYMBOL_GPL(serial8250_get_port);
420
421static void (*serial8250_isa_config)(int port, struct uart_port *up,
422 u32 *capabilities);
423
424void serial8250_set_isa_configurator(
425 void (*v)(int port, struct uart_port *up, u32 *capabilities))
426{
427 serial8250_isa_config = v;
428}
429EXPORT_SYMBOL(serial8250_set_isa_configurator);
430
431#ifdef CONFIG_SERIAL_8250_RSA
432
433static void univ8250_config_port(struct uart_port *port, int flags)
434{
435 struct uart_8250_port *up = up_to_u8250p(port);
436
437 up->probe &= ~UART_PROBE_RSA;
438 if (port->type == PORT_RSA) {
439 if (serial8250_request_rsa_resource(up) == 0)
440 up->probe |= UART_PROBE_RSA;
441 } else if (flags & UART_CONFIG_TYPE) {
442 int i;
443
444 for (i = 0; i < probe_rsa_count; i++) {
445 if (probe_rsa[i] == up->port.iobase) {
446 if (serial8250_request_rsa_resource(up) == 0)
447 up->probe |= UART_PROBE_RSA;
448 break;
449 }
450 }
451 }
452
453 base_ops->config_port(port, flags);
454
455 if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA)
456 serial8250_release_rsa_resource(up);
457}
458
459static int univ8250_request_port(struct uart_port *port)
460{
461 struct uart_8250_port *up = up_to_u8250p(port);
462 int ret;
463
464 ret = base_ops->request_port(port);
465 if (ret == 0 && port->type == PORT_RSA) {
466 ret = serial8250_request_rsa_resource(up);
467 if (ret < 0)
468 base_ops->release_port(port);
469 }
470
471 return ret;
472}
473
474static void univ8250_release_port(struct uart_port *port)
475{
476 struct uart_8250_port *up = up_to_u8250p(port);
477
478 if (port->type == PORT_RSA)
479 serial8250_release_rsa_resource(up);
480 base_ops->release_port(port);
481}
482
483static void univ8250_rsa_support(struct uart_ops *ops)
484{
485 ops->config_port = univ8250_config_port;
486 ops->request_port = univ8250_request_port;
487 ops->release_port = univ8250_release_port;
488}
489
490#else
491#define univ8250_rsa_support(x) do { } while (0)
492#endif
493
494static inline void serial8250_apply_quirks(struct uart_8250_port *up)
495{
496 up->port.quirks |= skip_txen_test ? UPQ_NO_TXEN_TEST : 0;
497}
498
499static void __init serial8250_isa_init_ports(void)
500{
501 struct uart_8250_port *up;
502 static int first = 1;
503 int i, irqflag = 0;
504
505 if (!first)
506 return;
507 first = 0;
508
509 if (nr_uarts > UART_NR)
510 nr_uarts = UART_NR;
511
512 for (i = 0; i < nr_uarts; i++) {
513 struct uart_8250_port *up = &serial8250_ports[i];
514 struct uart_port *port = &up->port;
515
516 port->line = i;
517 serial8250_init_port(up);
518 if (!base_ops)
519 base_ops = port->ops;
520 port->ops = &univ8250_port_ops;
521
522 timer_setup(&up->timer, serial8250_timeout, 0);
523
524 up->ops = &univ8250_driver_ops;
525
526
527
528
529 up->mcr_mask = ~ALPHA_KLUDGE_MCR;
530 up->mcr_force = ALPHA_KLUDGE_MCR;
531 }
532
533
534 univ8250_port_ops = *base_ops;
535 univ8250_rsa_support(&univ8250_port_ops);
536
537 if (share_irqs)
538 irqflag = IRQF_SHARED;
539
540 for (i = 0, up = serial8250_ports;
541 i < ARRAY_SIZE(old_serial_port) && i < nr_uarts;
542 i++, up++) {
543 struct uart_port *port = &up->port;
544
545 port->iobase = old_serial_port[i].port;
546 port->irq = irq_canonicalize(old_serial_port[i].irq);
547 port->irqflags = 0;
548 port->uartclk = old_serial_port[i].baud_base * 16;
549 port->flags = old_serial_port[i].flags;
550 port->hub6 = 0;
551 port->membase = old_serial_port[i].iomem_base;
552 port->iotype = old_serial_port[i].io_type;
553 port->regshift = old_serial_port[i].iomem_reg_shift;
554 serial8250_set_defaults(up);
555
556 port->irqflags |= irqflag;
557 if (serial8250_isa_config != NULL)
558 serial8250_isa_config(i, &up->port, &up->capabilities);
559 }
560}
561
562static void __init
563serial8250_register_ports(struct uart_driver *drv, struct device *dev)
564{
565 int i;
566
567 for (i = 0; i < nr_uarts; i++) {
568 struct uart_8250_port *up = &serial8250_ports[i];
569
570 if (up->port.type == PORT_8250_CIR)
571 continue;
572
573 if (up->port.dev)
574 continue;
575
576 up->port.dev = dev;
577
578 serial8250_apply_quirks(up);
579 uart_add_one_port(drv, &up->port);
580 }
581}
582
583#ifdef CONFIG_SERIAL_8250_CONSOLE
584
585static void univ8250_console_write(struct console *co, const char *s,
586 unsigned int count)
587{
588 struct uart_8250_port *up = &serial8250_ports[co->index];
589
590 serial8250_console_write(up, s, count);
591}
592
593static int univ8250_console_setup(struct console *co, char *options)
594{
595 struct uart_port *port;
596 int retval;
597
598
599
600
601
602
603 if (co->index >= nr_uarts)
604 co->index = 0;
605 port = &serial8250_ports[co->index].port;
606
607 port->cons = co;
608
609 retval = serial8250_console_setup(port, options, false);
610 if (retval != 0)
611 port->cons = NULL;
612 return retval;
613}
614
615
616
617
618
619
620
621
622
623
624
625
626
627
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629
630
631
632
633static int univ8250_console_match(struct console *co, char *name, int idx,
634 char *options)
635{
636 char match[] = "uart";
637 unsigned char iotype;
638 resource_size_t addr;
639 int i;
640
641 if (strncmp(name, match, 4) != 0)
642 return -ENODEV;
643
644 if (uart_parse_earlycon(options, &iotype, &addr, &options))
645 return -ENODEV;
646
647
648 for (i = 0; i < nr_uarts; i++) {
649 struct uart_port *port = &serial8250_ports[i].port;
650
651 if (port->iotype != iotype)
652 continue;
653 if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 ||
654 iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE)
655 && (port->mapbase != addr))
656 continue;
657 if (iotype == UPIO_PORT && port->iobase != addr)
658 continue;
659
660 co->index = i;
661 port->cons = co;
662 return serial8250_console_setup(port, options, true);
663 }
664
665 return -ENODEV;
666}
667
668static struct console univ8250_console = {
669 .name = "ttyS",
670 .write = univ8250_console_write,
671 .device = uart_console_device,
672 .setup = univ8250_console_setup,
673 .match = univ8250_console_match,
674 .flags = CON_PRINTBUFFER | CON_ANYTIME,
675 .index = -1,
676 .data = &serial8250_reg,
677};
678
679static int __init univ8250_console_init(void)
680{
681 if (nr_uarts == 0)
682 return -ENODEV;
683
684 serial8250_isa_init_ports();
685 register_console(&univ8250_console);
686 return 0;
687}
688console_initcall(univ8250_console_init);
689
690#define SERIAL8250_CONSOLE (&univ8250_console)
691#else
692#define SERIAL8250_CONSOLE NULL
693#endif
694
695static struct uart_driver serial8250_reg = {
696 .owner = THIS_MODULE,
697 .driver_name = "serial",
698 .dev_name = "ttyS",
699 .major = TTY_MAJOR,
700 .minor = 64,
701 .cons = SERIAL8250_CONSOLE,
702};
703
704
705
706
707
708
709
710int __init early_serial_setup(struct uart_port *port)
711{
712 struct uart_port *p;
713
714 if (port->line >= ARRAY_SIZE(serial8250_ports) || nr_uarts == 0)
715 return -ENODEV;
716
717 serial8250_isa_init_ports();
718 p = &serial8250_ports[port->line].port;
719 p->iobase = port->iobase;
720 p->membase = port->membase;
721 p->irq = port->irq;
722 p->irqflags = port->irqflags;
723 p->uartclk = port->uartclk;
724 p->fifosize = port->fifosize;
725 p->regshift = port->regshift;
726 p->iotype = port->iotype;
727 p->flags = port->flags;
728 p->mapbase = port->mapbase;
729 p->mapsize = port->mapsize;
730 p->private_data = port->private_data;
731 p->type = port->type;
732 p->line = port->line;
733
734 serial8250_set_defaults(up_to_u8250p(p));
735
736 if (port->serial_in)
737 p->serial_in = port->serial_in;
738 if (port->serial_out)
739 p->serial_out = port->serial_out;
740 if (port->handle_irq)
741 p->handle_irq = port->handle_irq;
742
743 return 0;
744}
745
746
747
748
749
750
751
752void serial8250_suspend_port(int line)
753{
754 struct uart_8250_port *up = &serial8250_ports[line];
755 struct uart_port *port = &up->port;
756
757 if (!console_suspend_enabled && uart_console(port) &&
758 port->type != PORT_8250) {
759 unsigned char canary = 0xa5;
760 serial_out(up, UART_SCR, canary);
761 if (serial_in(up, UART_SCR) == canary)
762 up->canary = canary;
763 }
764
765 uart_suspend_port(&serial8250_reg, port);
766}
767EXPORT_SYMBOL(serial8250_suspend_port);
768
769
770
771
772
773
774
775void serial8250_resume_port(int line)
776{
777 struct uart_8250_port *up = &serial8250_ports[line];
778 struct uart_port *port = &up->port;
779
780 up->canary = 0;
781
782 if (up->capabilities & UART_NATSEMI) {
783
784 serial_port_out(port, UART_LCR, 0xE0);
785
786 ns16550a_goto_highspeed(up);
787
788 serial_port_out(port, UART_LCR, 0);
789 port->uartclk = 921600*16;
790 }
791 uart_resume_port(&serial8250_reg, port);
792}
793EXPORT_SYMBOL(serial8250_resume_port);
794
795
796
797
798
799
800static int serial8250_probe(struct platform_device *dev)
801{
802 struct plat_serial8250_port *p = dev_get_platdata(&dev->dev);
803 struct uart_8250_port uart;
804 int ret, i, irqflag = 0;
805
806 memset(&uart, 0, sizeof(uart));
807
808 if (share_irqs)
809 irqflag = IRQF_SHARED;
810
811 for (i = 0; p && p->flags != 0; p++, i++) {
812 uart.port.iobase = p->iobase;
813 uart.port.membase = p->membase;
814 uart.port.irq = p->irq;
815 uart.port.irqflags = p->irqflags;
816 uart.port.uartclk = p->uartclk;
817 uart.port.regshift = p->regshift;
818 uart.port.iotype = p->iotype;
819 uart.port.flags = p->flags;
820 uart.port.mapbase = p->mapbase;
821 uart.port.hub6 = p->hub6;
822 uart.port.private_data = p->private_data;
823 uart.port.type = p->type;
824 uart.port.serial_in = p->serial_in;
825 uart.port.serial_out = p->serial_out;
826 uart.port.handle_irq = p->handle_irq;
827 uart.port.handle_break = p->handle_break;
828 uart.port.set_termios = p->set_termios;
829 uart.port.set_ldisc = p->set_ldisc;
830 uart.port.get_mctrl = p->get_mctrl;
831 uart.port.pm = p->pm;
832 uart.port.dev = &dev->dev;
833 uart.port.irqflags |= irqflag;
834 ret = serial8250_register_8250_port(&uart);
835 if (ret < 0) {
836 dev_err(&dev->dev, "unable to register port at index %d "
837 "(IO%lx MEM%llx IRQ%d): %d\n", i,
838 p->iobase, (unsigned long long)p->mapbase,
839 p->irq, ret);
840 }
841 }
842 return 0;
843}
844
845
846
847
848static int serial8250_remove(struct platform_device *dev)
849{
850 int i;
851
852 for (i = 0; i < nr_uarts; i++) {
853 struct uart_8250_port *up = &serial8250_ports[i];
854
855 if (up->port.dev == &dev->dev)
856 serial8250_unregister_port(i);
857 }
858 return 0;
859}
860
861static int serial8250_suspend(struct platform_device *dev, pm_message_t state)
862{
863 int i;
864
865 for (i = 0; i < UART_NR; i++) {
866 struct uart_8250_port *up = &serial8250_ports[i];
867
868 if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
869 uart_suspend_port(&serial8250_reg, &up->port);
870 }
871
872 return 0;
873}
874
875static int serial8250_resume(struct platform_device *dev)
876{
877 int i;
878
879 for (i = 0; i < UART_NR; i++) {
880 struct uart_8250_port *up = &serial8250_ports[i];
881
882 if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
883 serial8250_resume_port(i);
884 }
885
886 return 0;
887}
888
889static struct platform_driver serial8250_isa_driver = {
890 .probe = serial8250_probe,
891 .remove = serial8250_remove,
892 .suspend = serial8250_suspend,
893 .resume = serial8250_resume,
894 .driver = {
895 .name = "serial8250",
896 },
897};
898
899
900
901
902
903static struct platform_device *serial8250_isa_devs;
904
905
906
907
908
909
910static DEFINE_MUTEX(serial_mutex);
911
912static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port)
913{
914 int i;
915
916
917
918
919 for (i = 0; i < nr_uarts; i++)
920 if (uart_match_port(&serial8250_ports[i].port, port))
921 return &serial8250_ports[i];
922
923
924 i = port->line;
925 if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN &&
926 serial8250_ports[i].port.iobase == 0)
927 return &serial8250_ports[i];
928
929
930
931
932
933 for (i = 0; i < nr_uarts; i++)
934 if (serial8250_ports[i].port.type == PORT_UNKNOWN &&
935 serial8250_ports[i].port.iobase == 0)
936 return &serial8250_ports[i];
937
938
939
940
941
942 for (i = 0; i < nr_uarts; i++)
943 if (serial8250_ports[i].port.type == PORT_UNKNOWN)
944 return &serial8250_ports[i];
945
946 return NULL;
947}
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962int serial8250_register_8250_port(struct uart_8250_port *up)
963{
964 struct uart_8250_port *uart;
965 int ret = -ENOSPC;
966
967 if (up->port.uartclk == 0)
968 return -EINVAL;
969
970 mutex_lock(&serial_mutex);
971
972 uart = serial8250_find_match_or_unused(&up->port);
973 if (uart && uart->port.type != PORT_8250_CIR) {
974 if (uart->port.dev)
975 uart_remove_one_port(&serial8250_reg, &uart->port);
976
977 uart->port.iobase = up->port.iobase;
978 uart->port.membase = up->port.membase;
979 uart->port.irq = up->port.irq;
980 uart->port.irqflags = up->port.irqflags;
981 uart->port.uartclk = up->port.uartclk;
982 uart->port.fifosize = up->port.fifosize;
983 uart->port.regshift = up->port.regshift;
984 uart->port.iotype = up->port.iotype;
985 uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF;
986 uart->bugs = up->bugs;
987 uart->port.mapbase = up->port.mapbase;
988 uart->port.mapsize = up->port.mapsize;
989 uart->port.private_data = up->port.private_data;
990 uart->tx_loadsz = up->tx_loadsz;
991 uart->capabilities = up->capabilities;
992 uart->port.throttle = up->port.throttle;
993 uart->port.unthrottle = up->port.unthrottle;
994 uart->port.rs485_config = up->port.rs485_config;
995 uart->port.rs485 = up->port.rs485;
996 uart->dma = up->dma;
997
998
999 if (uart->port.fifosize && !uart->tx_loadsz)
1000 uart->tx_loadsz = uart->port.fifosize;
1001
1002 if (up->port.dev)
1003 uart->port.dev = up->port.dev;
1004
1005 if (up->port.flags & UPF_FIXED_TYPE)
1006 uart->port.type = up->port.type;
1007
1008 serial8250_set_defaults(uart);
1009
1010
1011 if (up->port.serial_in)
1012 uart->port.serial_in = up->port.serial_in;
1013 if (up->port.serial_out)
1014 uart->port.serial_out = up->port.serial_out;
1015 if (up->port.handle_irq)
1016 uart->port.handle_irq = up->port.handle_irq;
1017
1018 if (up->port.set_termios)
1019 uart->port.set_termios = up->port.set_termios;
1020 if (up->port.set_ldisc)
1021 uart->port.set_ldisc = up->port.set_ldisc;
1022 if (up->port.get_mctrl)
1023 uart->port.get_mctrl = up->port.get_mctrl;
1024 if (up->port.set_mctrl)
1025 uart->port.set_mctrl = up->port.set_mctrl;
1026 if (up->port.startup)
1027 uart->port.startup = up->port.startup;
1028 if (up->port.shutdown)
1029 uart->port.shutdown = up->port.shutdown;
1030 if (up->port.pm)
1031 uart->port.pm = up->port.pm;
1032 if (up->port.handle_break)
1033 uart->port.handle_break = up->port.handle_break;
1034 if (up->dl_read)
1035 uart->dl_read = up->dl_read;
1036 if (up->dl_write)
1037 uart->dl_write = up->dl_write;
1038
1039 if (uart->port.type != PORT_8250_CIR) {
1040 if (serial8250_isa_config != NULL)
1041 serial8250_isa_config(0, &uart->port,
1042 &uart->capabilities);
1043
1044 serial8250_apply_quirks(uart);
1045 ret = uart_add_one_port(&serial8250_reg,
1046 &uart->port);
1047 if (ret == 0)
1048 ret = uart->port.line;
1049 } else {
1050 dev_info(uart->port.dev,
1051 "skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n",
1052 uart->port.iobase,
1053 (unsigned long long)uart->port.mapbase,
1054 uart->port.irq);
1055
1056 ret = 0;
1057 }
1058 }
1059 mutex_unlock(&serial_mutex);
1060
1061 return ret;
1062}
1063EXPORT_SYMBOL(serial8250_register_8250_port);
1064
1065
1066
1067
1068
1069
1070
1071
1072void serial8250_unregister_port(int line)
1073{
1074 struct uart_8250_port *uart = &serial8250_ports[line];
1075
1076 mutex_lock(&serial_mutex);
1077
1078 if (uart->em485) {
1079 unsigned long flags;
1080
1081 spin_lock_irqsave(&uart->port.lock, flags);
1082 serial8250_em485_destroy(uart);
1083 spin_unlock_irqrestore(&uart->port.lock, flags);
1084 }
1085
1086 uart_remove_one_port(&serial8250_reg, &uart->port);
1087 if (serial8250_isa_devs) {
1088 uart->port.flags &= ~UPF_BOOT_AUTOCONF;
1089 uart->port.type = PORT_UNKNOWN;
1090 uart->port.dev = &serial8250_isa_devs->dev;
1091 uart->capabilities = 0;
1092 serial8250_apply_quirks(uart);
1093 uart_add_one_port(&serial8250_reg, &uart->port);
1094 } else {
1095 uart->port.dev = NULL;
1096 }
1097 mutex_unlock(&serial_mutex);
1098}
1099EXPORT_SYMBOL(serial8250_unregister_port);
1100
1101static int __init serial8250_init(void)
1102{
1103 int ret;
1104
1105 if (nr_uarts == 0)
1106 return -ENODEV;
1107
1108 serial8250_isa_init_ports();
1109
1110 pr_info("Serial: 8250/16550 driver, %d ports, IRQ sharing %sabled\n",
1111 nr_uarts, share_irqs ? "en" : "dis");
1112
1113#ifdef CONFIG_SPARC
1114 ret = sunserial_register_minors(&serial8250_reg, UART_NR);
1115#else
1116 serial8250_reg.nr = UART_NR;
1117 ret = uart_register_driver(&serial8250_reg);
1118#endif
1119 if (ret)
1120 goto out;
1121
1122 ret = serial8250_pnp_init();
1123 if (ret)
1124 goto unreg_uart_drv;
1125
1126 serial8250_isa_devs = platform_device_alloc("serial8250",
1127 PLAT8250_DEV_LEGACY);
1128 if (!serial8250_isa_devs) {
1129 ret = -ENOMEM;
1130 goto unreg_pnp;
1131 }
1132
1133 ret = platform_device_add(serial8250_isa_devs);
1134 if (ret)
1135 goto put_dev;
1136
1137 serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev);
1138
1139 ret = platform_driver_register(&serial8250_isa_driver);
1140 if (ret == 0)
1141 goto out;
1142
1143 platform_device_del(serial8250_isa_devs);
1144put_dev:
1145 platform_device_put(serial8250_isa_devs);
1146unreg_pnp:
1147 serial8250_pnp_exit();
1148unreg_uart_drv:
1149#ifdef CONFIG_SPARC
1150 sunserial_unregister_minors(&serial8250_reg, UART_NR);
1151#else
1152 uart_unregister_driver(&serial8250_reg);
1153#endif
1154out:
1155 return ret;
1156}
1157
1158static void __exit serial8250_exit(void)
1159{
1160 struct platform_device *isa_dev = serial8250_isa_devs;
1161
1162
1163
1164
1165
1166
1167 serial8250_isa_devs = NULL;
1168
1169 platform_driver_unregister(&serial8250_isa_driver);
1170 platform_device_unregister(isa_dev);
1171
1172 serial8250_pnp_exit();
1173
1174#ifdef CONFIG_SPARC
1175 sunserial_unregister_minors(&serial8250_reg, UART_NR);
1176#else
1177 uart_unregister_driver(&serial8250_reg);
1178#endif
1179}
1180
1181module_init(serial8250_init);
1182module_exit(serial8250_exit);
1183
1184MODULE_LICENSE("GPL");
1185MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");
1186
1187module_param_hw(share_irqs, uint, other, 0644);
1188MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices (unsafe)");
1189
1190module_param(nr_uarts, uint, 0644);
1191MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");
1192
1193module_param(skip_txen_test, uint, 0644);
1194MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");
1195
1196#ifdef CONFIG_SERIAL_8250_RSA
1197module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
1198MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
1199#endif
1200MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);
1201
1202#ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
1203#ifndef MODULE
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214static void __used s8250_options(void)
1215{
1216#undef MODULE_PARAM_PREFIX
1217#define MODULE_PARAM_PREFIX "8250_core."
1218
1219 module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644);
1220 module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644);
1221 module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644);
1222#ifdef CONFIG_SERIAL_8250_RSA
1223 __module_param_call(MODULE_PARAM_PREFIX, probe_rsa,
1224 ¶m_array_ops, .arr = &__param_arr_probe_rsa,
1225 0444, -1, 0);
1226#endif
1227}
1228#else
1229MODULE_ALIAS("8250_core");
1230#endif
1231#endif
1232