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21#include <linux/module.h>
22#include <linux/moduleparam.h>
23#include <linux/ioport.h>
24#include <linux/init.h>
25#include <linux/console.h>
26#include <linux/sysrq.h>
27#include <linux/delay.h>
28#include <linux/platform_device.h>
29#include <linux/tty.h>
30#include <linux/ratelimit.h>
31#include <linux/tty_flip.h>
32#include <linux/serial.h>
33#include <linux/serial_8250.h>
34#include <linux/nmi.h>
35#include <linux/mutex.h>
36#include <linux/slab.h>
37#include <linux/uaccess.h>
38#include <linux/pm_runtime.h>
39#include <linux/io.h>
40#ifdef CONFIG_SPARC
41#include <linux/sunserialcore.h>
42#endif
43
44#include <asm/irq.h>
45
46#include "8250.h"
47
48
49
50
51
52
53static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
54
55static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS;
56
57static struct uart_driver serial8250_reg;
58
59static unsigned int skip_txen_test;
60
61#define PASS_LIMIT 512
62
63#include <asm/serial.h>
64
65
66
67
68
69#ifndef SERIAL_PORT_DFNS
70#define SERIAL_PORT_DFNS
71#endif
72
73static const struct old_serial_port old_serial_port[] = {
74 SERIAL_PORT_DFNS
75};
76
77#define UART_NR CONFIG_SERIAL_8250_NR_UARTS
78
79#ifdef CONFIG_SERIAL_8250_RSA
80
81#define PORT_RSA_MAX 4
82static unsigned long probe_rsa[PORT_RSA_MAX];
83static unsigned int probe_rsa_count;
84#endif
85
86struct irq_info {
87 struct hlist_node node;
88 int irq;
89 spinlock_t lock;
90 struct list_head *head;
91};
92
93#define NR_IRQ_HASH 32
94static struct hlist_head irq_lists[NR_IRQ_HASH];
95static DEFINE_MUTEX(hash_mutex);
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
112{
113 struct irq_info *i = dev_id;
114 struct list_head *l, *end = NULL;
115 int pass_counter = 0, handled = 0;
116
117 DEBUG_INTR("serial8250_interrupt(%d)...", irq);
118
119 spin_lock(&i->lock);
120
121 l = i->head;
122 do {
123 struct uart_8250_port *up;
124 struct uart_port *port;
125
126 up = list_entry(l, struct uart_8250_port, list);
127 port = &up->port;
128
129 if (port->handle_irq(port)) {
130 handled = 1;
131 end = NULL;
132 } else if (end == NULL)
133 end = l;
134
135 l = l->next;
136
137 if (l == i->head && pass_counter++ > PASS_LIMIT) {
138
139 printk_ratelimited(KERN_ERR
140 "serial8250: too much work for irq%d\n", irq);
141 break;
142 }
143 } while (l != end);
144
145 spin_unlock(&i->lock);
146
147 DEBUG_INTR("end.\n");
148
149 return IRQ_RETVAL(handled);
150}
151
152
153
154
155
156
157
158
159static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
160{
161 spin_lock_irq(&i->lock);
162
163 if (!list_empty(i->head)) {
164 if (i->head == &up->list)
165 i->head = i->head->next;
166 list_del(&up->list);
167 } else {
168 BUG_ON(i->head != &up->list);
169 i->head = NULL;
170 }
171 spin_unlock_irq(&i->lock);
172
173 if (i->head == NULL) {
174 hlist_del(&i->node);
175 kfree(i);
176 }
177}
178
179static int serial_link_irq_chain(struct uart_8250_port *up)
180{
181 struct hlist_head *h;
182 struct hlist_node *n;
183 struct irq_info *i;
184 int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
185
186 mutex_lock(&hash_mutex);
187
188 h = &irq_lists[up->port.irq % NR_IRQ_HASH];
189
190 hlist_for_each(n, h) {
191 i = hlist_entry(n, struct irq_info, node);
192 if (i->irq == up->port.irq)
193 break;
194 }
195
196 if (n == NULL) {
197 i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
198 if (i == NULL) {
199 mutex_unlock(&hash_mutex);
200 return -ENOMEM;
201 }
202 spin_lock_init(&i->lock);
203 i->irq = up->port.irq;
204 hlist_add_head(&i->node, h);
205 }
206 mutex_unlock(&hash_mutex);
207
208 spin_lock_irq(&i->lock);
209
210 if (i->head) {
211 list_add(&up->list, i->head);
212 spin_unlock_irq(&i->lock);
213
214 ret = 0;
215 } else {
216 INIT_LIST_HEAD(&up->list);
217 i->head = &up->list;
218 spin_unlock_irq(&i->lock);
219 irq_flags |= up->port.irqflags;
220 ret = request_irq(up->port.irq, serial8250_interrupt,
221 irq_flags, "serial", i);
222 if (ret < 0)
223 serial_do_unlink(i, up);
224 }
225
226 return ret;
227}
228
229static void serial_unlink_irq_chain(struct uart_8250_port *up)
230{
231
232
233
234
235 struct irq_info *i;
236 struct hlist_node *n;
237 struct hlist_head *h;
238
239 mutex_lock(&hash_mutex);
240
241 h = &irq_lists[up->port.irq % NR_IRQ_HASH];
242
243 hlist_for_each(n, h) {
244 i = hlist_entry(n, struct irq_info, node);
245 if (i->irq == up->port.irq)
246 break;
247 }
248
249 BUG_ON(n == NULL);
250 BUG_ON(i->head == NULL);
251
252 if (list_empty(i->head))
253 free_irq(up->port.irq, i);
254
255 serial_do_unlink(i, up);
256 mutex_unlock(&hash_mutex);
257}
258
259
260
261
262
263
264
265static void serial8250_timeout(unsigned long data)
266{
267 struct uart_8250_port *up = (struct uart_8250_port *)data;
268
269 up->port.handle_irq(&up->port);
270 mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
271}
272
273static void serial8250_backup_timeout(unsigned long data)
274{
275 struct uart_8250_port *up = (struct uart_8250_port *)data;
276 unsigned int iir, ier = 0, lsr;
277 unsigned long flags;
278
279 spin_lock_irqsave(&up->port.lock, flags);
280
281
282
283
284
285 if (up->port.irq) {
286 ier = serial_in(up, UART_IER);
287 serial_out(up, UART_IER, 0);
288 }
289
290 iir = serial_in(up, UART_IIR);
291
292
293
294
295
296
297
298 lsr = serial_in(up, UART_LSR);
299 up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
300 if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
301 (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
302 (lsr & UART_LSR_THRE)) {
303 iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
304 iir |= UART_IIR_THRI;
305 }
306
307 if (!(iir & UART_IIR_NO_INT))
308 serial8250_tx_chars(up);
309
310 if (up->port.irq)
311 serial_out(up, UART_IER, ier);
312
313 spin_unlock_irqrestore(&up->port.lock, flags);
314
315
316 mod_timer(&up->timer,
317 jiffies + uart_poll_timeout(&up->port) + HZ / 5);
318}
319
320static int univ8250_setup_irq(struct uart_8250_port *up)
321{
322 struct uart_port *port = &up->port;
323 int retval = 0;
324
325
326
327
328
329 if (up->bugs & UART_BUG_THRE) {
330 pr_debug("ttyS%d - using backup timer\n", serial_index(port));
331
332 up->timer.function = serial8250_backup_timeout;
333 up->timer.data = (unsigned long)up;
334 mod_timer(&up->timer, jiffies +
335 uart_poll_timeout(port) + HZ / 5);
336 }
337
338
339
340
341
342
343 if (!port->irq) {
344 up->timer.data = (unsigned long)up;
345 mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
346 } else
347 retval = serial_link_irq_chain(up);
348
349 return retval;
350}
351
352static void univ8250_release_irq(struct uart_8250_port *up)
353{
354 struct uart_port *port = &up->port;
355
356 del_timer_sync(&up->timer);
357 up->timer.function = serial8250_timeout;
358 if (port->irq)
359 serial_unlink_irq_chain(up);
360}
361
362#ifdef CONFIG_SERIAL_8250_RSA
363static int serial8250_request_rsa_resource(struct uart_8250_port *up)
364{
365 unsigned long start = UART_RSA_BASE << up->port.regshift;
366 unsigned int size = 8 << up->port.regshift;
367 struct uart_port *port = &up->port;
368 int ret = -EINVAL;
369
370 switch (port->iotype) {
371 case UPIO_HUB6:
372 case UPIO_PORT:
373 start += port->iobase;
374 if (request_region(start, size, "serial-rsa"))
375 ret = 0;
376 else
377 ret = -EBUSY;
378 break;
379 }
380
381 return ret;
382}
383
384static void serial8250_release_rsa_resource(struct uart_8250_port *up)
385{
386 unsigned long offset = UART_RSA_BASE << up->port.regshift;
387 unsigned int size = 8 << up->port.regshift;
388 struct uart_port *port = &up->port;
389
390 switch (port->iotype) {
391 case UPIO_HUB6:
392 case UPIO_PORT:
393 release_region(port->iobase + offset, size);
394 break;
395 }
396}
397#endif
398
399static const struct uart_ops *base_ops;
400static struct uart_ops univ8250_port_ops;
401
402static const struct uart_8250_ops univ8250_driver_ops = {
403 .setup_irq = univ8250_setup_irq,
404 .release_irq = univ8250_release_irq,
405};
406
407static struct uart_8250_port serial8250_ports[UART_NR];
408
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418
419
420
421struct uart_8250_port *serial8250_get_port(int line)
422{
423 return &serial8250_ports[line];
424}
425EXPORT_SYMBOL_GPL(serial8250_get_port);
426
427static void (*serial8250_isa_config)(int port, struct uart_port *up,
428 unsigned short *capabilities);
429
430void serial8250_set_isa_configurator(
431 void (*v)(int port, struct uart_port *up, unsigned short *capabilities))
432{
433 serial8250_isa_config = v;
434}
435EXPORT_SYMBOL(serial8250_set_isa_configurator);
436
437#ifdef CONFIG_SERIAL_8250_RSA
438
439static void univ8250_config_port(struct uart_port *port, int flags)
440{
441 struct uart_8250_port *up = up_to_u8250p(port);
442
443 up->probe &= ~UART_PROBE_RSA;
444 if (port->type == PORT_RSA) {
445 if (serial8250_request_rsa_resource(up) == 0)
446 up->probe |= UART_PROBE_RSA;
447 } else if (flags & UART_CONFIG_TYPE) {
448 int i;
449
450 for (i = 0; i < probe_rsa_count; i++) {
451 if (probe_rsa[i] == up->port.iobase) {
452 if (serial8250_request_rsa_resource(up) == 0)
453 up->probe |= UART_PROBE_RSA;
454 break;
455 }
456 }
457 }
458
459 base_ops->config_port(port, flags);
460
461 if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA)
462 serial8250_release_rsa_resource(up);
463}
464
465static int univ8250_request_port(struct uart_port *port)
466{
467 struct uart_8250_port *up = up_to_u8250p(port);
468 int ret;
469
470 ret = base_ops->request_port(port);
471 if (ret == 0 && port->type == PORT_RSA) {
472 ret = serial8250_request_rsa_resource(up);
473 if (ret < 0)
474 base_ops->release_port(port);
475 }
476
477 return ret;
478}
479
480static void univ8250_release_port(struct uart_port *port)
481{
482 struct uart_8250_port *up = up_to_u8250p(port);
483
484 if (port->type == PORT_RSA)
485 serial8250_release_rsa_resource(up);
486 base_ops->release_port(port);
487}
488
489static void univ8250_rsa_support(struct uart_ops *ops)
490{
491 ops->config_port = univ8250_config_port;
492 ops->request_port = univ8250_request_port;
493 ops->release_port = univ8250_release_port;
494}
495
496#else
497#define univ8250_rsa_support(x) do { } while (0)
498#endif
499
500static void __init serial8250_isa_init_ports(void)
501{
502 struct uart_8250_port *up;
503 static int first = 1;
504 int i, irqflag = 0;
505
506 if (!first)
507 return;
508 first = 0;
509
510 if (nr_uarts > UART_NR)
511 nr_uarts = UART_NR;
512
513 for (i = 0; i < nr_uarts; i++) {
514 struct uart_8250_port *up = &serial8250_ports[i];
515 struct uart_port *port = &up->port;
516
517 port->line = i;
518 serial8250_init_port(up);
519 if (!base_ops)
520 base_ops = port->ops;
521 port->ops = &univ8250_port_ops;
522
523 init_timer(&up->timer);
524 up->timer.function = serial8250_timeout;
525
526 up->ops = &univ8250_driver_ops;
527
528
529
530
531 up->mcr_mask = ~ALPHA_KLUDGE_MCR;
532 up->mcr_force = ALPHA_KLUDGE_MCR;
533 }
534
535
536 univ8250_port_ops = *base_ops;
537 univ8250_rsa_support(&univ8250_port_ops);
538
539 if (share_irqs)
540 irqflag = IRQF_SHARED;
541
542 for (i = 0, up = serial8250_ports;
543 i < ARRAY_SIZE(old_serial_port) && i < nr_uarts;
544 i++, up++) {
545 struct uart_port *port = &up->port;
546
547 port->iobase = old_serial_port[i].port;
548 port->irq = irq_canonicalize(old_serial_port[i].irq);
549 port->irqflags = old_serial_port[i].irqflags;
550 port->uartclk = old_serial_port[i].baud_base * 16;
551 port->flags = old_serial_port[i].flags;
552 port->hub6 = old_serial_port[i].hub6;
553 port->membase = old_serial_port[i].iomem_base;
554 port->iotype = old_serial_port[i].io_type;
555 port->regshift = old_serial_port[i].iomem_reg_shift;
556 serial8250_set_defaults(up);
557
558 port->irqflags |= irqflag;
559 if (serial8250_isa_config != NULL)
560 serial8250_isa_config(i, &up->port, &up->capabilities);
561 }
562}
563
564static void __init
565serial8250_register_ports(struct uart_driver *drv, struct device *dev)
566{
567 int i;
568
569 for (i = 0; i < nr_uarts; i++) {
570 struct uart_8250_port *up = &serial8250_ports[i];
571
572 if (up->port.type == PORT_8250_CIR)
573 continue;
574
575 if (up->port.dev)
576 continue;
577
578 up->port.dev = dev;
579
580 if (skip_txen_test)
581 up->port.flags |= UPF_NO_TXEN_TEST;
582
583 uart_add_one_port(drv, &up->port);
584 }
585}
586
587#ifdef CONFIG_SERIAL_8250_CONSOLE
588
589static void univ8250_console_write(struct console *co, const char *s,
590 unsigned int count)
591{
592 struct uart_8250_port *up = &serial8250_ports[co->index];
593
594 serial8250_console_write(up, s, count);
595}
596
597static int univ8250_console_setup(struct console *co, char *options)
598{
599 struct uart_port *port;
600 int retval;
601
602
603
604
605
606
607 if (co->index >= nr_uarts)
608 co->index = 0;
609 port = &serial8250_ports[co->index].port;
610
611 port->cons = co;
612
613 retval = serial8250_console_setup(port, options, false);
614 if (retval != 0)
615 port->cons = NULL;
616 return retval;
617}
618
619
620
621
622
623
624
625
626
627
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629
630
631
632
633
634
635
636
637static int univ8250_console_match(struct console *co, char *name, int idx,
638 char *options)
639{
640 char match[] = "uart";
641 unsigned char iotype;
642 unsigned long addr;
643 int i;
644
645 if (strncmp(name, match, 4) != 0)
646 return -ENODEV;
647
648 if (uart_parse_earlycon(options, &iotype, &addr, &options))
649 return -ENODEV;
650
651
652 for (i = 0; i < nr_uarts; i++) {
653 struct uart_port *port = &serial8250_ports[i].port;
654
655 if (port->iotype != iotype)
656 continue;
657 if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 ||
658 iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE)
659 && (port->mapbase != addr))
660 continue;
661 if (iotype == UPIO_PORT && port->iobase != addr)
662 continue;
663
664 co->index = i;
665 port->cons = co;
666 return serial8250_console_setup(port, options, true);
667 }
668
669 return -ENODEV;
670}
671
672static struct console univ8250_console = {
673 .name = "ttyS",
674 .write = univ8250_console_write,
675 .device = uart_console_device,
676 .setup = univ8250_console_setup,
677 .match = univ8250_console_match,
678 .flags = CON_PRINTBUFFER | CON_ANYTIME,
679 .index = -1,
680 .data = &serial8250_reg,
681};
682
683static int __init univ8250_console_init(void)
684{
685 if (nr_uarts == 0)
686 return -ENODEV;
687
688 serial8250_isa_init_ports();
689 register_console(&univ8250_console);
690 return 0;
691}
692console_initcall(univ8250_console_init);
693
694#define SERIAL8250_CONSOLE (&univ8250_console)
695#else
696#define SERIAL8250_CONSOLE NULL
697#endif
698
699static struct uart_driver serial8250_reg = {
700 .owner = THIS_MODULE,
701 .driver_name = "serial",
702 .dev_name = "ttyS",
703 .major = TTY_MAJOR,
704 .minor = 64,
705 .cons = SERIAL8250_CONSOLE,
706};
707
708
709
710
711
712
713
714int __init early_serial_setup(struct uart_port *port)
715{
716 struct uart_port *p;
717
718 if (port->line >= ARRAY_SIZE(serial8250_ports) || nr_uarts == 0)
719 return -ENODEV;
720
721 serial8250_isa_init_ports();
722 p = &serial8250_ports[port->line].port;
723 p->iobase = port->iobase;
724 p->membase = port->membase;
725 p->irq = port->irq;
726 p->irqflags = port->irqflags;
727 p->uartclk = port->uartclk;
728 p->fifosize = port->fifosize;
729 p->regshift = port->regshift;
730 p->iotype = port->iotype;
731 p->flags = port->flags;
732 p->mapbase = port->mapbase;
733 p->mapsize = port->mapsize;
734 p->private_data = port->private_data;
735 p->type = port->type;
736 p->line = port->line;
737
738 serial8250_set_defaults(up_to_u8250p(p));
739
740 if (port->serial_in)
741 p->serial_in = port->serial_in;
742 if (port->serial_out)
743 p->serial_out = port->serial_out;
744 if (port->handle_irq)
745 p->handle_irq = port->handle_irq;
746
747 return 0;
748}
749
750
751
752
753
754
755
756void serial8250_suspend_port(int line)
757{
758 struct uart_8250_port *up = &serial8250_ports[line];
759 struct uart_port *port = &up->port;
760
761 if (!console_suspend_enabled && uart_console(port) &&
762 port->type != PORT_8250) {
763 unsigned char canary = 0xa5;
764 serial_out(up, UART_SCR, canary);
765 if (serial_in(up, UART_SCR) == canary)
766 up->canary = canary;
767 }
768
769 uart_suspend_port(&serial8250_reg, port);
770}
771EXPORT_SYMBOL(serial8250_suspend_port);
772
773
774
775
776
777
778
779void serial8250_resume_port(int line)
780{
781 struct uart_8250_port *up = &serial8250_ports[line];
782 struct uart_port *port = &up->port;
783
784 up->canary = 0;
785
786 if (up->capabilities & UART_NATSEMI) {
787
788 serial_port_out(port, UART_LCR, 0xE0);
789
790 ns16550a_goto_highspeed(up);
791
792 serial_port_out(port, UART_LCR, 0);
793 port->uartclk = 921600*16;
794 }
795 uart_resume_port(&serial8250_reg, port);
796}
797EXPORT_SYMBOL(serial8250_resume_port);
798
799
800
801
802
803
804static int serial8250_probe(struct platform_device *dev)
805{
806 struct plat_serial8250_port *p = dev_get_platdata(&dev->dev);
807 struct uart_8250_port uart;
808 int ret, i, irqflag = 0;
809
810 memset(&uart, 0, sizeof(uart));
811
812 if (share_irqs)
813 irqflag = IRQF_SHARED;
814
815 for (i = 0; p && p->flags != 0; p++, i++) {
816 uart.port.iobase = p->iobase;
817 uart.port.membase = p->membase;
818 uart.port.irq = p->irq;
819 uart.port.irqflags = p->irqflags;
820 uart.port.uartclk = p->uartclk;
821 uart.port.regshift = p->regshift;
822 uart.port.iotype = p->iotype;
823 uart.port.flags = p->flags;
824 uart.port.mapbase = p->mapbase;
825 uart.port.hub6 = p->hub6;
826 uart.port.private_data = p->private_data;
827 uart.port.type = p->type;
828 uart.port.serial_in = p->serial_in;
829 uart.port.serial_out = p->serial_out;
830 uart.port.handle_irq = p->handle_irq;
831 uart.port.handle_break = p->handle_break;
832 uart.port.set_termios = p->set_termios;
833 uart.port.pm = p->pm;
834 uart.port.dev = &dev->dev;
835 uart.port.irqflags |= irqflag;
836 ret = serial8250_register_8250_port(&uart);
837 if (ret < 0) {
838 dev_err(&dev->dev, "unable to register port at index %d "
839 "(IO%lx MEM%llx IRQ%d): %d\n", i,
840 p->iobase, (unsigned long long)p->mapbase,
841 p->irq, ret);
842 }
843 }
844 return 0;
845}
846
847
848
849
850static int serial8250_remove(struct platform_device *dev)
851{
852 int i;
853
854 for (i = 0; i < nr_uarts; i++) {
855 struct uart_8250_port *up = &serial8250_ports[i];
856
857 if (up->port.dev == &dev->dev)
858 serial8250_unregister_port(i);
859 }
860 return 0;
861}
862
863static int serial8250_suspend(struct platform_device *dev, pm_message_t state)
864{
865 int i;
866
867 for (i = 0; i < UART_NR; i++) {
868 struct uart_8250_port *up = &serial8250_ports[i];
869
870 if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
871 uart_suspend_port(&serial8250_reg, &up->port);
872 }
873
874 return 0;
875}
876
877static int serial8250_resume(struct platform_device *dev)
878{
879 int i;
880
881 for (i = 0; i < UART_NR; i++) {
882 struct uart_8250_port *up = &serial8250_ports[i];
883
884 if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
885 serial8250_resume_port(i);
886 }
887
888 return 0;
889}
890
891static struct platform_driver serial8250_isa_driver = {
892 .probe = serial8250_probe,
893 .remove = serial8250_remove,
894 .suspend = serial8250_suspend,
895 .resume = serial8250_resume,
896 .driver = {
897 .name = "serial8250",
898 },
899};
900
901
902
903
904
905static struct platform_device *serial8250_isa_devs;
906
907
908
909
910
911
912static DEFINE_MUTEX(serial_mutex);
913
914static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port)
915{
916 int i;
917
918
919
920
921 for (i = 0; i < nr_uarts; i++)
922 if (uart_match_port(&serial8250_ports[i].port, port))
923 return &serial8250_ports[i];
924
925
926 i = port->line;
927 if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN &&
928 serial8250_ports[i].port.iobase == 0)
929 return &serial8250_ports[i];
930
931
932
933
934
935 for (i = 0; i < nr_uarts; i++)
936 if (serial8250_ports[i].port.type == PORT_UNKNOWN &&
937 serial8250_ports[i].port.iobase == 0)
938 return &serial8250_ports[i];
939
940
941
942
943
944 for (i = 0; i < nr_uarts; i++)
945 if (serial8250_ports[i].port.type == PORT_UNKNOWN)
946 return &serial8250_ports[i];
947
948 return NULL;
949}
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964int serial8250_register_8250_port(struct uart_8250_port *up)
965{
966 struct uart_8250_port *uart;
967 int ret = -ENOSPC;
968
969 if (up->port.uartclk == 0)
970 return -EINVAL;
971
972 mutex_lock(&serial_mutex);
973
974 uart = serial8250_find_match_or_unused(&up->port);
975 if (uart && uart->port.type != PORT_8250_CIR) {
976 if (uart->port.dev)
977 uart_remove_one_port(&serial8250_reg, &uart->port);
978
979 uart->port.iobase = up->port.iobase;
980 uart->port.membase = up->port.membase;
981 uart->port.irq = up->port.irq;
982 uart->port.irqflags = up->port.irqflags;
983 uart->port.uartclk = up->port.uartclk;
984 uart->port.fifosize = up->port.fifosize;
985 uart->port.regshift = up->port.regshift;
986 uart->port.iotype = up->port.iotype;
987 uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF;
988 uart->bugs = up->bugs;
989 uart->port.mapbase = up->port.mapbase;
990 uart->port.mapsize = up->port.mapsize;
991 uart->port.private_data = up->port.private_data;
992 uart->tx_loadsz = up->tx_loadsz;
993 uart->capabilities = up->capabilities;
994 uart->port.throttle = up->port.throttle;
995 uart->port.unthrottle = up->port.unthrottle;
996 uart->port.rs485_config = up->port.rs485_config;
997 uart->port.rs485 = up->port.rs485;
998 uart->dma = up->dma;
999
1000
1001 if (uart->port.fifosize && !uart->tx_loadsz)
1002 uart->tx_loadsz = uart->port.fifosize;
1003
1004 if (up->port.dev)
1005 uart->port.dev = up->port.dev;
1006
1007 if (skip_txen_test)
1008 uart->port.flags |= UPF_NO_TXEN_TEST;
1009
1010 if (up->port.flags & UPF_FIXED_TYPE)
1011 uart->port.type = up->port.type;
1012
1013 serial8250_set_defaults(uart);
1014
1015
1016 if (up->port.serial_in)
1017 uart->port.serial_in = up->port.serial_in;
1018 if (up->port.serial_out)
1019 uart->port.serial_out = up->port.serial_out;
1020 if (up->port.handle_irq)
1021 uart->port.handle_irq = up->port.handle_irq;
1022
1023 if (up->port.set_termios)
1024 uart->port.set_termios = up->port.set_termios;
1025 if (up->port.set_mctrl)
1026 uart->port.set_mctrl = up->port.set_mctrl;
1027 if (up->port.startup)
1028 uart->port.startup = up->port.startup;
1029 if (up->port.shutdown)
1030 uart->port.shutdown = up->port.shutdown;
1031 if (up->port.pm)
1032 uart->port.pm = up->port.pm;
1033 if (up->port.handle_break)
1034 uart->port.handle_break = up->port.handle_break;
1035 if (up->dl_read)
1036 uart->dl_read = up->dl_read;
1037 if (up->dl_write)
1038 uart->dl_write = up->dl_write;
1039
1040 if (uart->port.type != PORT_8250_CIR) {
1041 if (serial8250_isa_config != NULL)
1042 serial8250_isa_config(0, &uart->port,
1043 &uart->capabilities);
1044
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 if (skip_txen_test)
1090 uart->port.flags |= UPF_NO_TXEN_TEST;
1091 uart->port.type = PORT_UNKNOWN;
1092 uart->port.dev = &serial8250_isa_devs->dev;
1093 uart->capabilities = 0;
1094 uart_add_one_port(&serial8250_reg, &uart->port);
1095 } else {
1096 uart->port.dev = NULL;
1097 }
1098 mutex_unlock(&serial_mutex);
1099}
1100EXPORT_SYMBOL(serial8250_unregister_port);
1101
1102static int __init serial8250_init(void)
1103{
1104 int ret;
1105
1106 if (nr_uarts == 0)
1107 return -ENODEV;
1108
1109 serial8250_isa_init_ports();
1110
1111 pr_info("Serial: 8250/16550 driver, %d ports, IRQ sharing %sabled\n",
1112 nr_uarts, share_irqs ? "en" : "dis");
1113
1114#ifdef CONFIG_SPARC
1115 ret = sunserial_register_minors(&serial8250_reg, UART_NR);
1116#else
1117 serial8250_reg.nr = UART_NR;
1118 ret = uart_register_driver(&serial8250_reg);
1119#endif
1120 if (ret)
1121 goto out;
1122
1123 ret = serial8250_pnp_init();
1124 if (ret)
1125 goto unreg_uart_drv;
1126
1127 serial8250_isa_devs = platform_device_alloc("serial8250",
1128 PLAT8250_DEV_LEGACY);
1129 if (!serial8250_isa_devs) {
1130 ret = -ENOMEM;
1131 goto unreg_pnp;
1132 }
1133
1134 ret = platform_device_add(serial8250_isa_devs);
1135 if (ret)
1136 goto put_dev;
1137
1138 serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev);
1139
1140 ret = platform_driver_register(&serial8250_isa_driver);
1141 if (ret == 0)
1142 goto out;
1143
1144 platform_device_del(serial8250_isa_devs);
1145put_dev:
1146 platform_device_put(serial8250_isa_devs);
1147unreg_pnp:
1148 serial8250_pnp_exit();
1149unreg_uart_drv:
1150#ifdef CONFIG_SPARC
1151 sunserial_unregister_minors(&serial8250_reg, UART_NR);
1152#else
1153 uart_unregister_driver(&serial8250_reg);
1154#endif
1155out:
1156 return ret;
1157}
1158
1159static void __exit serial8250_exit(void)
1160{
1161 struct platform_device *isa_dev = serial8250_isa_devs;
1162
1163
1164
1165
1166
1167
1168 serial8250_isa_devs = NULL;
1169
1170 platform_driver_unregister(&serial8250_isa_driver);
1171 platform_device_unregister(isa_dev);
1172
1173 serial8250_pnp_exit();
1174
1175#ifdef CONFIG_SPARC
1176 sunserial_unregister_minors(&serial8250_reg, UART_NR);
1177#else
1178 uart_unregister_driver(&serial8250_reg);
1179#endif
1180}
1181
1182module_init(serial8250_init);
1183module_exit(serial8250_exit);
1184
1185MODULE_LICENSE("GPL");
1186MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");
1187
1188module_param(share_irqs, uint, 0644);
1189MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices (unsafe)");
1190
1191module_param(nr_uarts, uint, 0644);
1192MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");
1193
1194module_param(skip_txen_test, uint, 0644);
1195MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");
1196
1197#ifdef CONFIG_SERIAL_8250_RSA
1198module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444);
1199MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
1200#endif
1201MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);
1202
1203#ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
1204#ifndef MODULE
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215static void __used s8250_options(void)
1216{
1217#undef MODULE_PARAM_PREFIX
1218#define MODULE_PARAM_PREFIX "8250_core."
1219
1220 module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644);
1221 module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644);
1222 module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644);
1223#ifdef CONFIG_SERIAL_8250_RSA
1224 __module_param_call(MODULE_PARAM_PREFIX, probe_rsa,
1225 ¶m_array_ops, .arr = &__param_arr_probe_rsa,
1226 0444, -1, 0);
1227#endif
1228}
1229#else
1230MODULE_ALIAS("8250_core");
1231#endif
1232#endif
1233