Free Electrons

Electrons Libres - Embedded Linux Experts

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
/*
 *  Universal/legacy driver for 8250/16550-type serial ports
 *
 *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
 *
 *  Copyright (C) 2001 Russell King.
 *
 *  Supports: ISA-compatible 8250/16550 ports
 *	      PNP 8250/16550 ports
 *	      early_serial_setup() ports
 *	      userspace-configurable "phantom" ports
 *	      "serial8250" platform devices
 *	      serial8250_register_8250_port() ports
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/tty.h>
#include <linux/ratelimit.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/nmi.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
#ifdef CONFIG_SPARC
#include <linux/sunserialcore.h>
#endif

#include <asm/irq.h>

#include "8250.h"

/*
 * Configuration:
 *   share_irqs - whether we pass IRQF_SHARED to request_irq().  This option
 *                is unsafe when used on edge-triggered interrupts.
 */
static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;

static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS;

static struct uart_driver serial8250_reg;

static unsigned int skip_txen_test; /* force skip of txen test at init time */

#define PASS_LIMIT	512

#include <asm/serial.h>
/*
 * SERIAL_PORT_DFNS tells us about built-in ports that have no
 * standard enumeration mechanism.   Platforms that can find all
 * serial ports via mechanisms like ACPI or PCI need not supply it.
 */
#ifndef SERIAL_PORT_DFNS
#define SERIAL_PORT_DFNS
#endif

static const struct old_serial_port old_serial_port[] = {
	SERIAL_PORT_DFNS /* defined in asm/serial.h */
};

#define UART_NR	CONFIG_SERIAL_8250_NR_UARTS

#ifdef CONFIG_SERIAL_8250_RSA

#define PORT_RSA_MAX 4
static unsigned long probe_rsa[PORT_RSA_MAX];
static unsigned int probe_rsa_count;
#endif /* CONFIG_SERIAL_8250_RSA  */

struct irq_info {
	struct			hlist_node node;
	int			irq;
	spinlock_t		lock;	/* Protects list not the hash */
	struct list_head	*head;
};

#define NR_IRQ_HASH		32	/* Can be adjusted later */
static struct hlist_head irq_lists[NR_IRQ_HASH];
static DEFINE_MUTEX(hash_mutex);	/* Used to walk the hash */

/*
 * This is the serial driver's interrupt routine.
 *
 * Arjan thinks the old way was overly complex, so it got simplified.
 * Alan disagrees, saying that need the complexity to handle the weird
 * nature of ISA shared interrupts.  (This is a special exception.)
 *
 * In order to handle ISA shared interrupts properly, we need to check
 * that all ports have been serviced, and therefore the ISA interrupt
 * line has been de-asserted.
 *
 * This means we need to loop through all ports. checking that they
 * don't have an interrupt pending.
 */
static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
{
	struct irq_info *i = dev_id;
	struct list_head *l, *end = NULL;
	int pass_counter = 0, handled = 0;

	pr_debug("%s(%d): start\n", __func__, irq);

	spin_lock(&i->lock);

	l = i->head;
	do {
		struct uart_8250_port *up;
		struct uart_port *port;

		up = list_entry(l, struct uart_8250_port, list);
		port = &up->port;

		if (port->handle_irq(port)) {
			handled = 1;
			end = NULL;
		} else if (end == NULL)
			end = l;

		l = l->next;

		if (l == i->head && pass_counter++ > PASS_LIMIT) {
			/* If we hit this, we're dead. */
			printk_ratelimited(KERN_ERR
				"serial8250: too much work for irq%d\n", irq);
			break;
		}
	} while (l != end);

	spin_unlock(&i->lock);

	pr_debug("%s(%d): end\n", __func__, irq);

	return IRQ_RETVAL(handled);
}

/*
 * To support ISA shared interrupts, we need to have one interrupt
 * handler that ensures that the IRQ line has been deasserted
 * before returning.  Failing to do this will result in the IRQ
 * line being stuck active, and, since ISA irqs are edge triggered,
 * no more IRQs will be seen.
 */
static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
{
	spin_lock_irq(&i->lock);

	if (!list_empty(i->head)) {
		if (i->head == &up->list)
			i->head = i->head->next;
		list_del(&up->list);
	} else {
		BUG_ON(i->head != &up->list);
		i->head = NULL;
	}
	spin_unlock_irq(&i->lock);
	/* List empty so throw away the hash node */
	if (i->head == NULL) {
		hlist_del(&i->node);
		kfree(i);
	}
}

static int serial_link_irq_chain(struct uart_8250_port *up)
{
	struct hlist_head *h;
	struct hlist_node *n;
	struct irq_info *i;
	int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;

	mutex_lock(&hash_mutex);

	h = &irq_lists[up->port.irq % NR_IRQ_HASH];

	hlist_for_each(n, h) {
		i = hlist_entry(n, struct irq_info, node);
		if (i->irq == up->port.irq)
			break;
	}

	if (n == NULL) {
		i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
		if (i == NULL) {
			mutex_unlock(&hash_mutex);
			return -ENOMEM;
		}
		spin_lock_init(&i->lock);
		i->irq = up->port.irq;
		hlist_add_head(&i->node, h);
	}
	mutex_unlock(&hash_mutex);

	spin_lock_irq(&i->lock);

	if (i->head) {
		list_add(&up->list, i->head);
		spin_unlock_irq(&i->lock);

		ret = 0;
	} else {
		INIT_LIST_HEAD(&up->list);
		i->head = &up->list;
		spin_unlock_irq(&i->lock);
		irq_flags |= up->port.irqflags;
		ret = request_irq(up->port.irq, serial8250_interrupt,
				  irq_flags, up->port.name, i);
		if (ret < 0)
			serial_do_unlink(i, up);
	}

	return ret;
}

static void serial_unlink_irq_chain(struct uart_8250_port *up)
{
	/*
	 * yes, some broken gcc emit "warning: 'i' may be used uninitialized"
	 * but no, we are not going to take a patch that assigns NULL below.
	 */
	struct irq_info *i;
	struct hlist_node *n;
	struct hlist_head *h;

	mutex_lock(&hash_mutex);

	h = &irq_lists[up->port.irq % NR_IRQ_HASH];

	hlist_for_each(n, h) {
		i = hlist_entry(n, struct irq_info, node);
		if (i->irq == up->port.irq)
			break;
	}

	BUG_ON(n == NULL);
	BUG_ON(i->head == NULL);

	if (list_empty(i->head))
		free_irq(up->port.irq, i);

	serial_do_unlink(i, up);
	mutex_unlock(&hash_mutex);
}

/*
 * This function is used to handle ports that do not have an
 * interrupt.  This doesn't work very well for 16450's, but gives
 * barely passable results for a 16550A.  (Although at the expense
 * of much CPU overhead).
 */
static void serial8250_timeout(unsigned long data)
{
	struct uart_8250_port *up = (struct uart_8250_port *)data;

	up->port.handle_irq(&up->port);
	mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
}

static void serial8250_backup_timeout(unsigned long data)
{
	struct uart_8250_port *up = (struct uart_8250_port *)data;
	unsigned int iir, ier = 0, lsr;
	unsigned long flags;

	spin_lock_irqsave(&up->port.lock, flags);

	/*
	 * Must disable interrupts or else we risk racing with the interrupt
	 * based handler.
	 */
	if (up->port.irq) {
		ier = serial_in(up, UART_IER);
		serial_out(up, UART_IER, 0);
	}

	iir = serial_in(up, UART_IIR);

	/*
	 * This should be a safe test for anyone who doesn't trust the
	 * IIR bits on their UART, but it's specifically designed for
	 * the "Diva" UART used on the management processor on many HP
	 * ia64 and parisc boxes.
	 */
	lsr = serial_in(up, UART_LSR);
	up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
	if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
	    (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
	    (lsr & UART_LSR_THRE)) {
		iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
		iir |= UART_IIR_THRI;
	}

	if (!(iir & UART_IIR_NO_INT))
		serial8250_tx_chars(up);

	if (up->port.irq)
		serial_out(up, UART_IER, ier);

	spin_unlock_irqrestore(&up->port.lock, flags);

	/* Standard timer interval plus 0.2s to keep the port running */
	mod_timer(&up->timer,
		jiffies + uart_poll_timeout(&up->port) + HZ / 5);
}

static int univ8250_setup_irq(struct uart_8250_port *up)
{
	struct uart_port *port = &up->port;
	int retval = 0;

	/*
	 * The above check will only give an accurate result the first time
	 * the port is opened so this value needs to be preserved.
	 */
	if (up->bugs & UART_BUG_THRE) {
		pr_debug("ttyS%d - using backup timer\n", serial_index(port));

		up->timer.function = serial8250_backup_timeout;
		up->timer.data = (unsigned long)up;
		mod_timer(&up->timer, jiffies +
			  uart_poll_timeout(port) + HZ / 5);
	}

	/*
	 * If the "interrupt" for this port doesn't correspond with any
	 * hardware interrupt, we use a timer-based system.  The original
	 * driver used to do this with IRQ0.
	 */
	if (!port->irq) {
		up->timer.data = (unsigned long)up;
		mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
	} else
		retval = serial_link_irq_chain(up);

	return retval;
}

static void univ8250_release_irq(struct uart_8250_port *up)
{
	struct uart_port *port = &up->port;

	del_timer_sync(&up->timer);
	up->timer.function = serial8250_timeout;
	if (port->irq)
		serial_unlink_irq_chain(up);
}

#ifdef CONFIG_SERIAL_8250_RSA
static int serial8250_request_rsa_resource(struct uart_8250_port *up)
{
	unsigned long start = UART_RSA_BASE << up->port.regshift;
	unsigned int size = 8 << up->port.regshift;
	struct uart_port *port = &up->port;
	int ret = -EINVAL;

	switch (port->iotype) {
	case UPIO_HUB6:
	case UPIO_PORT:
		start += port->iobase;
		if (request_region(start, size, "serial-rsa"))
			ret = 0;
		else
			ret = -EBUSY;
		break;
	}

	return ret;
}

static void serial8250_release_rsa_resource(struct uart_8250_port *up)
{
	unsigned long offset = UART_RSA_BASE << up->port.regshift;
	unsigned int size = 8 << up->port.regshift;
	struct uart_port *port = &up->port;

	switch (port->iotype) {
	case UPIO_HUB6:
	case UPIO_PORT:
		release_region(port->iobase + offset, size);
		break;
	}
}
#endif

static const struct uart_ops *base_ops;
static struct uart_ops univ8250_port_ops;

static const struct uart_8250_ops univ8250_driver_ops = {
	.setup_irq	= univ8250_setup_irq,
	.release_irq	= univ8250_release_irq,
};

static struct uart_8250_port serial8250_ports[UART_NR];

/**
 * serial8250_get_port - retrieve struct uart_8250_port
 * @line: serial line number
 *
 * This function retrieves struct uart_8250_port for the specific line.
 * This struct *must* *not* be used to perform a 8250 or serial core operation
 * which is not accessible otherwise. Its only purpose is to make the struct
 * accessible to the runtime-pm callbacks for context suspend/restore.
 * The lock assumption made here is none because runtime-pm suspend/resume
 * callbacks should not be invoked if there is any operation performed on the
 * port.
 */
struct uart_8250_port *serial8250_get_port(int line)
{
	return &serial8250_ports[line];
}
EXPORT_SYMBOL_GPL(serial8250_get_port);

static void (*serial8250_isa_config)(int port, struct uart_port *up,
	u32 *capabilities);

void serial8250_set_isa_configurator(
	void (*v)(int port, struct uart_port *up, u32 *capabilities))
{
	serial8250_isa_config = v;
}
EXPORT_SYMBOL(serial8250_set_isa_configurator);

#ifdef CONFIG_SERIAL_8250_RSA

static void univ8250_config_port(struct uart_port *port, int flags)
{
	struct uart_8250_port *up = up_to_u8250p(port);

	up->probe &= ~UART_PROBE_RSA;
	if (port->type == PORT_RSA) {
		if (serial8250_request_rsa_resource(up) == 0)
			up->probe |= UART_PROBE_RSA;
	} else if (flags & UART_CONFIG_TYPE) {
		int i;

		for (i = 0; i < probe_rsa_count; i++) {
			if (probe_rsa[i] == up->port.iobase) {
				if (serial8250_request_rsa_resource(up) == 0)
					up->probe |= UART_PROBE_RSA;
				break;
			}
		}
	}

	base_ops->config_port(port, flags);

	if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA)
		serial8250_release_rsa_resource(up);
}

static int univ8250_request_port(struct uart_port *port)
{
	struct uart_8250_port *up = up_to_u8250p(port);
	int ret;

	ret = base_ops->request_port(port);
	if (ret == 0 && port->type == PORT_RSA) {
		ret = serial8250_request_rsa_resource(up);
		if (ret < 0)
			base_ops->release_port(port);
	}

	return ret;
}

static void univ8250_release_port(struct uart_port *port)
{
	struct uart_8250_port *up = up_to_u8250p(port);

	if (port->type == PORT_RSA)
		serial8250_release_rsa_resource(up);
	base_ops->release_port(port);
}

static void univ8250_rsa_support(struct uart_ops *ops)
{
	ops->config_port  = univ8250_config_port;
	ops->request_port = univ8250_request_port;
	ops->release_port = univ8250_release_port;
}

#else
#define univ8250_rsa_support(x)		do { } while (0)
#endif /* CONFIG_SERIAL_8250_RSA */

static void __init serial8250_isa_init_ports(void)
{
	struct uart_8250_port *up;
	static int first = 1;
	int i, irqflag = 0;

	if (!first)
		return;
	first = 0;

	if (nr_uarts > UART_NR)
		nr_uarts = UART_NR;

	for (i = 0; i < nr_uarts; i++) {
		struct uart_8250_port *up = &serial8250_ports[i];
		struct uart_port *port = &up->port;

		port->line = i;
		serial8250_init_port(up);
		if (!base_ops)
			base_ops = port->ops;
		port->ops = &univ8250_port_ops;

		init_timer(&up->timer);
		up->timer.function = serial8250_timeout;

		up->ops = &univ8250_driver_ops;

		/*
		 * ALPHA_KLUDGE_MCR needs to be killed.
		 */
		up->mcr_mask = ~ALPHA_KLUDGE_MCR;
		up->mcr_force = ALPHA_KLUDGE_MCR;
	}

	/* chain base port ops to support Remote Supervisor Adapter */
	univ8250_port_ops = *base_ops;
	univ8250_rsa_support(&univ8250_port_ops);

	if (share_irqs)
		irqflag = IRQF_SHARED;

	for (i = 0, up = serial8250_ports;
	     i < ARRAY_SIZE(old_serial_port) && i < nr_uarts;
	     i++, up++) {
		struct uart_port *port = &up->port;

		port->iobase   = old_serial_port[i].port;
		port->irq      = irq_canonicalize(old_serial_port[i].irq);
		port->irqflags = 0;
		port->uartclk  = old_serial_port[i].baud_base * 16;
		port->flags    = old_serial_port[i].flags;
		port->hub6     = 0;
		port->membase  = old_serial_port[i].iomem_base;
		port->iotype   = old_serial_port[i].io_type;
		port->regshift = old_serial_port[i].iomem_reg_shift;
		serial8250_set_defaults(up);

		port->irqflags |= irqflag;
		if (serial8250_isa_config != NULL)
			serial8250_isa_config(i, &up->port, &up->capabilities);
	}
}

static void __init
serial8250_register_ports(struct uart_driver *drv, struct device *dev)
{
	int i;

	for (i = 0; i < nr_uarts; i++) {
		struct uart_8250_port *up = &serial8250_ports[i];

		if (up->port.type == PORT_8250_CIR)
			continue;

		if (up->port.dev)
			continue;

		up->port.dev = dev;

		if (skip_txen_test)
			up->port.flags |= UPF_NO_TXEN_TEST;

		uart_add_one_port(drv, &up->port);
	}
}

#ifdef CONFIG_SERIAL_8250_CONSOLE

static void univ8250_console_write(struct console *co, const char *s,
				   unsigned int count)
{
	struct uart_8250_port *up = &serial8250_ports[co->index];

	serial8250_console_write(up, s, count);
}

static int univ8250_console_setup(struct console *co, char *options)
{
	struct uart_port *port;
	int retval;

	/*
	 * Check whether an invalid uart number has been specified, and
	 * if so, search for the first available port that does have
	 * console support.
	 */
	if (co->index >= nr_uarts)
		co->index = 0;
	port = &serial8250_ports[co->index].port;
	/* link port to console */
	port->cons = co;

	retval = serial8250_console_setup(port, options, false);
	if (retval != 0)
		port->cons = NULL;
	return retval;
}

/**
 *	univ8250_console_match - non-standard console matching
 *	@co:	  registering console
 *	@name:	  name from console command line
 *	@idx:	  index from console command line
 *	@options: ptr to option string from console command line
 *
 *	Only attempts to match console command lines of the form:
 *	    console=uart[8250],io|mmio|mmio16|mmio32,<addr>[,<options>]
 *	    console=uart[8250],0x<addr>[,<options>]
 *	This form is used to register an initial earlycon boot console and
 *	replace it with the serial8250_console at 8250 driver init.
 *
 *	Performs console setup for a match (as required by interface)
 *	If no <options> are specified, then assume the h/w is already setup.
 *
 *	Returns 0 if console matches; otherwise non-zero to use default matching
 */
static int univ8250_console_match(struct console *co, char *name, int idx,
				  char *options)
{
	char match[] = "uart";	/* 8250-specific earlycon name */
	unsigned char iotype;
	resource_size_t addr;
	int i;

	if (strncmp(name, match, 4) != 0)
		return -ENODEV;

	if (uart_parse_earlycon(options, &iotype, &addr, &options))
		return -ENODEV;

	/* try to match the port specified on the command line */
	for (i = 0; i < nr_uarts; i++) {
		struct uart_port *port = &serial8250_ports[i].port;

		if (port->iotype != iotype)
			continue;
		if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 ||
		     iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE)
		    && (port->mapbase != addr))
			continue;
		if (iotype == UPIO_PORT && port->iobase != addr)
			continue;

		co->index = i;
		port->cons = co;
		return serial8250_console_setup(port, options, true);
	}

	return -ENODEV;
}

static struct console univ8250_console = {
	.name		= "ttyS",
	.write		= univ8250_console_write,
	.device		= uart_console_device,
	.setup		= univ8250_console_setup,
	.match		= univ8250_console_match,
	.flags		= CON_PRINTBUFFER | CON_ANYTIME,
	.index		= -1,
	.data		= &serial8250_reg,
};

static int __init univ8250_console_init(void)
{
	if (nr_uarts == 0)
		return -ENODEV;

	serial8250_isa_init_ports();
	register_console(&univ8250_console);
	return 0;
}
console_initcall(univ8250_console_init);

#define SERIAL8250_CONSOLE	(&univ8250_console)
#else
#define SERIAL8250_CONSOLE	NULL
#endif

static struct uart_driver serial8250_reg = {
	.owner			= THIS_MODULE,
	.driver_name		= "serial",
	.dev_name		= "ttyS",
	.major			= TTY_MAJOR,
	.minor			= 64,
	.cons			= SERIAL8250_CONSOLE,
};

/*
 * early_serial_setup - early registration for 8250 ports
 *
 * Setup an 8250 port structure prior to console initialisation.  Use
 * after console initialisation will cause undefined behaviour.
 */
int __init early_serial_setup(struct uart_port *port)
{
	struct uart_port *p;

	if (port->line >= ARRAY_SIZE(serial8250_ports) || nr_uarts == 0)
		return -ENODEV;

	serial8250_isa_init_ports();
	p = &serial8250_ports[port->line].port;
	p->iobase       = port->iobase;
	p->membase      = port->membase;
	p->irq          = port->irq;
	p->irqflags     = port->irqflags;
	p->uartclk      = port->uartclk;
	p->fifosize     = port->fifosize;
	p->regshift     = port->regshift;
	p->iotype       = port->iotype;
	p->flags        = port->flags;
	p->mapbase      = port->mapbase;
	p->mapsize      = port->mapsize;
	p->private_data = port->private_data;
	p->type		= port->type;
	p->line		= port->line;

	serial8250_set_defaults(up_to_u8250p(p));

	if (port->serial_in)
		p->serial_in = port->serial_in;
	if (port->serial_out)
		p->serial_out = port->serial_out;
	if (port->handle_irq)
		p->handle_irq = port->handle_irq;

	return 0;
}

/**
 *	serial8250_suspend_port - suspend one serial port
 *	@line:  serial line number
 *
 *	Suspend one serial port.
 */
void serial8250_suspend_port(int line)
{
	struct uart_8250_port *up = &serial8250_ports[line];
	struct uart_port *port = &up->port;

	if (!console_suspend_enabled && uart_console(port) &&
	    port->type != PORT_8250) {
		unsigned char canary = 0xa5;
		serial_out(up, UART_SCR, canary);
		if (serial_in(up, UART_SCR) == canary)
			up->canary = canary;
	}

	uart_suspend_port(&serial8250_reg, port);
}
EXPORT_SYMBOL(serial8250_suspend_port);

/**
 *	serial8250_resume_port - resume one serial port
 *	@line:  serial line number
 *
 *	Resume one serial port.
 */
void serial8250_resume_port(int line)
{
	struct uart_8250_port *up = &serial8250_ports[line];
	struct uart_port *port = &up->port;

	up->canary = 0;

	if (up->capabilities & UART_NATSEMI) {
		/* Ensure it's still in high speed mode */
		serial_port_out(port, UART_LCR, 0xE0);

		ns16550a_goto_highspeed(up);

		serial_port_out(port, UART_LCR, 0);
		port->uartclk = 921600*16;
	}
	uart_resume_port(&serial8250_reg, port);
}
EXPORT_SYMBOL(serial8250_resume_port);

/*
 * Register a set of serial devices attached to a platform device.  The
 * list is terminated with a zero flags entry, which means we expect
 * all entries to have at least UPF_BOOT_AUTOCONF set.
 */
static int serial8250_probe(struct platform_device *dev)
{
	struct plat_serial8250_port *p = dev_get_platdata(&dev->dev);
	struct uart_8250_port uart;
	int ret, i, irqflag = 0;

	memset(&uart, 0, sizeof(uart));

	if (share_irqs)
		irqflag = IRQF_SHARED;

	for (i = 0; p && p->flags != 0; p++, i++) {
		uart.port.iobase	= p->iobase;
		uart.port.membase	= p->membase;
		uart.port.irq		= p->irq;
		uart.port.irqflags	= p->irqflags;
		uart.port.uartclk	= p->uartclk;
		uart.port.regshift	= p->regshift;
		uart.port.iotype	= p->iotype;
		uart.port.flags		= p->flags;
		uart.port.mapbase	= p->mapbase;
		uart.port.hub6		= p->hub6;
		uart.port.private_data	= p->private_data;
		uart.port.type		= p->type;
		uart.port.serial_in	= p->serial_in;
		uart.port.serial_out	= p->serial_out;
		uart.port.handle_irq	= p->handle_irq;
		uart.port.handle_break	= p->handle_break;
		uart.port.set_termios	= p->set_termios;
		uart.port.set_ldisc	= p->set_ldisc;
		uart.port.get_mctrl	= p->get_mctrl;
		uart.port.pm		= p->pm;
		uart.port.dev		= &dev->dev;
		uart.port.irqflags	|= irqflag;
		ret = serial8250_register_8250_port(&uart);
		if (ret < 0) {
			dev_err(&dev->dev, "unable to register port at index %d "
				"(IO%lx MEM%llx IRQ%d): %d\n", i,
				p->iobase, (unsigned long long)p->mapbase,
				p->irq, ret);
		}
	}
	return 0;
}

/*
 * Remove serial ports registered against a platform device.
 */
static int serial8250_remove(struct platform_device *dev)
{
	int i;

	for (i = 0; i < nr_uarts; i++) {
		struct uart_8250_port *up = &serial8250_ports[i];

		if (up->port.dev == &dev->dev)
			serial8250_unregister_port(i);
	}
	return 0;
}

static int serial8250_suspend(struct platform_device *dev, pm_message_t state)
{
	int i;

	for (i = 0; i < UART_NR; i++) {
		struct uart_8250_port *up = &serial8250_ports[i];

		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
			uart_suspend_port(&serial8250_reg, &up->port);
	}

	return 0;
}

static int serial8250_resume(struct platform_device *dev)
{
	int i;

	for (i = 0; i < UART_NR; i++) {
		struct uart_8250_port *up = &serial8250_ports[i];

		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
			serial8250_resume_port(i);
	}

	return 0;
}

static struct platform_driver serial8250_isa_driver = {
	.probe		= serial8250_probe,
	.remove		= serial8250_remove,
	.suspend	= serial8250_suspend,
	.resume		= serial8250_resume,
	.driver		= {
		.name	= "serial8250",
	},
};

/*
 * This "device" covers _all_ ISA 8250-compatible serial devices listed
 * in the table in include/asm/serial.h
 */
static struct platform_device *serial8250_isa_devs;

/*
 * serial8250_register_8250_port and serial8250_unregister_port allows for
 * 16x50 serial ports to be configured at run-time, to support PCMCIA
 * modems and PCI multiport cards.
 */
static DEFINE_MUTEX(serial_mutex);

static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port)
{
	int i;

	/*
	 * First, find a port entry which matches.
	 */
	for (i = 0; i < nr_uarts; i++)
		if (uart_match_port(&serial8250_ports[i].port, port))
			return &serial8250_ports[i];

	/* try line number first if still available */
	i = port->line;
	if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN &&
			serial8250_ports[i].port.iobase == 0)
		return &serial8250_ports[i];
	/*
	 * We didn't find a matching entry, so look for the first
	 * free entry.  We look for one which hasn't been previously
	 * used (indicated by zero iobase).
	 */
	for (i = 0; i < nr_uarts; i++)
		if (serial8250_ports[i].port.type == PORT_UNKNOWN &&
		    serial8250_ports[i].port.iobase == 0)
			return &serial8250_ports[i];

	/*
	 * That also failed.  Last resort is to find any entry which
	 * doesn't have a real port associated with it.
	 */
	for (i = 0; i < nr_uarts; i++)
		if (serial8250_ports[i].port.type == PORT_UNKNOWN)
			return &serial8250_ports[i];

	return NULL;
}

/**
 *	serial8250_register_8250_port - register a serial port
 *	@up: serial port template
 *
 *	Configure the serial port specified by the request. If the
 *	port exists and is in use, it is hung up and unregistered
 *	first.
 *
 *	The port is then probed and if necessary the IRQ is autodetected
 *	If this fails an error is returned.
 *
 *	On success the port is ready to use and the line number is returned.
 */
int serial8250_register_8250_port(struct uart_8250_port *up)
{
	struct uart_8250_port *uart;
	int ret = -ENOSPC;

	if (up->port.uartclk == 0)
		return -EINVAL;

	mutex_lock(&serial_mutex);

	uart = serial8250_find_match_or_unused(&up->port);
	if (uart && uart->port.type != PORT_8250_CIR) {
		if (uart->port.dev)
			uart_remove_one_port(&serial8250_reg, &uart->port);

		uart->port.iobase       = up->port.iobase;
		uart->port.membase      = up->port.membase;
		uart->port.irq          = up->port.irq;
		uart->port.irqflags     = up->port.irqflags;
		uart->port.uartclk      = up->port.uartclk;
		uart->port.fifosize     = up->port.fifosize;
		uart->port.regshift     = up->port.regshift;
		uart->port.iotype       = up->port.iotype;
		uart->port.flags        = up->port.flags | UPF_BOOT_AUTOCONF;
		uart->bugs		= up->bugs;
		uart->port.mapbase      = up->port.mapbase;
		uart->port.mapsize      = up->port.mapsize;
		uart->port.private_data = up->port.private_data;
		uart->tx_loadsz		= up->tx_loadsz;
		uart->capabilities	= up->capabilities;
		uart->port.throttle	= up->port.throttle;
		uart->port.unthrottle	= up->port.unthrottle;
		uart->port.rs485_config	= up->port.rs485_config;
		uart->port.rs485	= up->port.rs485;
		uart->dma		= up->dma;

		/* Take tx_loadsz from fifosize if it wasn't set separately */
		if (uart->port.fifosize && !uart->tx_loadsz)
			uart->tx_loadsz = uart->port.fifosize;

		if (up->port.dev)
			uart->port.dev = up->port.dev;

		if (skip_txen_test)
			uart->port.flags |= UPF_NO_TXEN_TEST;

		if (up->port.flags & UPF_FIXED_TYPE)
			uart->port.type = up->port.type;

		serial8250_set_defaults(uart);

		/* Possibly override default I/O functions.  */
		if (up->port.serial_in)
			uart->port.serial_in = up->port.serial_in;
		if (up->port.serial_out)
			uart->port.serial_out = up->port.serial_out;
		if (up->port.handle_irq)
			uart->port.handle_irq = up->port.handle_irq;
		/*  Possibly override set_termios call */
		if (up->port.set_termios)
			uart->port.set_termios = up->port.set_termios;
		if (up->port.set_ldisc)
			uart->port.set_ldisc = up->port.set_ldisc;
		if (up->port.get_mctrl)
			uart->port.get_mctrl = up->port.get_mctrl;
		if (up->port.set_mctrl)
			uart->port.set_mctrl = up->port.set_mctrl;
		if (up->port.startup)
			uart->port.startup = up->port.startup;
		if (up->port.shutdown)
			uart->port.shutdown = up->port.shutdown;
		if (up->port.pm)
			uart->port.pm = up->port.pm;
		if (up->port.handle_break)
			uart->port.handle_break = up->port.handle_break;
		if (up->dl_read)
			uart->dl_read = up->dl_read;
		if (up->dl_write)
			uart->dl_write = up->dl_write;

		if (uart->port.type != PORT_8250_CIR) {
			if (serial8250_isa_config != NULL)
				serial8250_isa_config(0, &uart->port,
						&uart->capabilities);

			ret = uart_add_one_port(&serial8250_reg,
						&uart->port);
			if (ret == 0)
				ret = uart->port.line;
		} else {
			dev_info(uart->port.dev,
				"skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n",
				uart->port.iobase,
				(unsigned long long)uart->port.mapbase,
				uart->port.irq);

			ret = 0;
		}
	}
	mutex_unlock(&serial_mutex);

	return ret;
}
EXPORT_SYMBOL(serial8250_register_8250_port);

/**
 *	serial8250_unregister_port - remove a 16x50 serial port at runtime
 *	@line: serial line number
 *
 *	Remove one serial port.  This may not be called from interrupt
 *	context.  We hand the port back to the our control.
 */
void serial8250_unregister_port(int line)
{
	struct uart_8250_port *uart = &serial8250_ports[line];

	mutex_lock(&serial_mutex);

	if (uart->em485) {
		unsigned long flags;

		spin_lock_irqsave(&uart->port.lock, flags);
		serial8250_em485_destroy(uart);
		spin_unlock_irqrestore(&uart->port.lock, flags);
	}

	uart_remove_one_port(&serial8250_reg, &uart->port);
	if (serial8250_isa_devs) {
		uart->port.flags &= ~UPF_BOOT_AUTOCONF;
		if (skip_txen_test)
			uart->port.flags |= UPF_NO_TXEN_TEST;
		uart->port.type = PORT_UNKNOWN;
		uart->port.dev = &serial8250_isa_devs->dev;
		uart->capabilities = 0;
		uart_add_one_port(&serial8250_reg, &uart->port);
	} else {
		uart->port.dev = NULL;
	}
	mutex_unlock(&serial_mutex);
}
EXPORT_SYMBOL(serial8250_unregister_port);

static int __init serial8250_init(void)
{
	int ret;

	if (nr_uarts == 0)
		return -ENODEV;

	serial8250_isa_init_ports();

	pr_info("Serial: 8250/16550 driver, %d ports, IRQ sharing %sabled\n",
		nr_uarts, share_irqs ? "en" : "dis");

#ifdef CONFIG_SPARC
	ret = sunserial_register_minors(&serial8250_reg, UART_NR);
#else
	serial8250_reg.nr = UART_NR;
	ret = uart_register_driver(&serial8250_reg);
#endif
	if (ret)
		goto out;

	ret = serial8250_pnp_init();
	if (ret)
		goto unreg_uart_drv;

	serial8250_isa_devs = platform_device_alloc("serial8250",
						    PLAT8250_DEV_LEGACY);
	if (!serial8250_isa_devs) {
		ret = -ENOMEM;
		goto unreg_pnp;
	}

	ret = platform_device_add(serial8250_isa_devs);
	if (ret)
		goto put_dev;

	serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev);

	ret = platform_driver_register(&serial8250_isa_driver);
	if (ret == 0)
		goto out;

	platform_device_del(serial8250_isa_devs);
put_dev:
	platform_device_put(serial8250_isa_devs);
unreg_pnp:
	serial8250_pnp_exit();
unreg_uart_drv:
#ifdef CONFIG_SPARC
	sunserial_unregister_minors(&serial8250_reg, UART_NR);
#else
	uart_unregister_driver(&serial8250_reg);
#endif
out:
	return ret;
}

static void __exit serial8250_exit(void)
{
	struct platform_device *isa_dev = serial8250_isa_devs;

	/*
	 * This tells serial8250_unregister_port() not to re-register
	 * the ports (thereby making serial8250_isa_driver permanently
	 * in use.)
	 */
	serial8250_isa_devs = NULL;

	platform_driver_unregister(&serial8250_isa_driver);
	platform_device_unregister(isa_dev);

	serial8250_pnp_exit();

#ifdef CONFIG_SPARC
	sunserial_unregister_minors(&serial8250_reg, UART_NR);
#else
	uart_unregister_driver(&serial8250_reg);
#endif
}

module_init(serial8250_init);
module_exit(serial8250_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");

module_param_hw(share_irqs, uint, other, 0644);
MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices (unsafe)");

module_param(nr_uarts, uint, 0644);
MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");

module_param(skip_txen_test, uint, 0644);
MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");

#ifdef CONFIG_SERIAL_8250_RSA
module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
#endif
MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);

#ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
#ifndef MODULE
/* This module was renamed to 8250_core in 3.7.  Keep the old "8250" name
 * working as well for the module options so we don't break people.  We
 * need to keep the names identical and the convenient macros will happily
 * refuse to let us do that by failing the build with redefinition errors
 * of global variables.  So we stick them inside a dummy function to avoid
 * those conflicts.  The options still get parsed, and the redefined
 * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive.
 *
 * This is hacky.  I'm sorry.
 */
static void __used s8250_options(void)
{
#undef MODULE_PARAM_PREFIX
#define MODULE_PARAM_PREFIX "8250_core."

	module_param_cb(share_irqs, &param_ops_uint, &share_irqs, 0644);
	module_param_cb(nr_uarts, &param_ops_uint, &nr_uarts, 0644);
	module_param_cb(skip_txen_test, &param_ops_uint, &skip_txen_test, 0644);
#ifdef CONFIG_SERIAL_8250_RSA
	__module_param_call(MODULE_PARAM_PREFIX, probe_rsa,
		&param_array_ops, .arr = &__param_arr_probe_rsa,
		0444, -1, 0);
#endif
}
#else
MODULE_ALIAS("8250_core");
#endif
#endif