summaryrefslogtreecommitdiffstats
path: root/include/asm-generic/io.h
blob: 4c44a29b5e8ef0e06d4af08e0ea4560e68fce6cf (plain)
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
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Generic I/O port emulation.
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */
#ifndef __ASM_GENERIC_IO_H
#define __ASM_GENERIC_IO_H

#include <asm/page.h> /* I/O is all done through memory accesses */
#include <linux/string.h> /* for memset() and memcpy() */
#include <linux/types.h>
#include <linux/instruction_pointer.h>

#ifdef CONFIG_GENERIC_IOMAP
#include <asm-generic/iomap.h>
#endif

#include <asm/mmiowb.h>
#include <asm-generic/pci_iomap.h>

#ifndef __io_br
#define __io_br()      barrier()
#endif

/* prevent prefetching of coherent DMA data ahead of a dma-complete */
#ifndef __io_ar
#ifdef rmb
#define __io_ar(v)      rmb()
#else
#define __io_ar(v)      barrier()
#endif
#endif

/* flush writes to coherent DMA data before possibly triggering a DMA read */
#ifndef __io_bw
#ifdef wmb
#define __io_bw()      wmb()
#else
#define __io_bw()      barrier()
#endif
#endif

/* serialize device access against a spin_unlock, usually handled there. */
#ifndef __io_aw
#define __io_aw()      mmiowb_set_pending()
#endif

#ifndef __io_pbw
#define __io_pbw()     __io_bw()
#endif

#ifndef __io_paw
#define __io_paw()     __io_aw()
#endif

#ifndef __io_pbr
#define __io_pbr()     __io_br()
#endif

#ifndef __io_par
#define __io_par(v)     __io_ar(v)
#endif

/*
 * "__DISABLE_TRACE_MMIO__" flag can be used to disable MMIO tracing for
 * specific kernel drivers in case of excessive/unwanted logging.
 *
 * Usage: Add a #define flag at the beginning of the driver file.
 * Ex: #define __DISABLE_TRACE_MMIO__
 *     #include <...>
 *     ...
 */
#if IS_ENABLED(CONFIG_TRACE_MMIO_ACCESS) && !(defined(__DISABLE_TRACE_MMIO__))
#include <linux/tracepoint-defs.h>

DECLARE_TRACEPOINT(rwmmio_write);
DECLARE_TRACEPOINT(rwmmio_post_write);
DECLARE_TRACEPOINT(rwmmio_read);
DECLARE_TRACEPOINT(rwmmio_post_read);

void log_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
		    unsigned long caller_addr, unsigned long caller_addr0);
void log_post_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
			 unsigned long caller_addr, unsigned long caller_addr0);
void log_read_mmio(u8 width, const volatile void __iomem *addr,
		   unsigned long caller_addr, unsigned long caller_addr0);
void log_post_read_mmio(u64 val, u8 width, const volatile void __iomem *addr,
			unsigned long caller_addr, unsigned long caller_addr0);

#else

static inline void log_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
				  unsigned long caller_addr, unsigned long caller_addr0) {}
static inline void log_post_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
				       unsigned long caller_addr, unsigned long caller_addr0) {}
static inline void log_read_mmio(u8 width, const volatile void __iomem *addr,
				 unsigned long caller_addr, unsigned long caller_addr0) {}
static inline void log_post_read_mmio(u64 val, u8 width, const volatile void __iomem *addr,
				      unsigned long caller_addr, unsigned long caller_addr0) {}

#endif /* CONFIG_TRACE_MMIO_ACCESS */

/*
 * __raw_{read,write}{b,w,l,q}() access memory in native endianness.
 *
 * On some architectures memory mapped IO needs to be accessed differently.
 * On the simple architectures, we just read/write the memory location
 * directly.
 */

#ifndef __raw_readb
#define __raw_readb __raw_readb
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
	return *(const volatile u8 __force *)addr;
}
#endif

#ifndef __raw_readw
#define __raw_readw __raw_readw
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
	return *(const volatile u16 __force *)addr;
}
#endif

#ifndef __raw_readl
#define __raw_readl __raw_readl
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
	return *(const volatile u32 __force *)addr;
}
#endif

#ifdef CONFIG_64BIT
#ifndef __raw_readq
#define __raw_readq __raw_readq
static inline u64 __raw_readq(const volatile void __iomem *addr)
{
	return *(const volatile u64 __force *)addr;
}
#endif
#endif /* CONFIG_64BIT */

#ifndef __raw_writeb
#define __raw_writeb __raw_writeb
static inline void __raw_writeb(u8 value, volatile void __iomem *addr)
{
	*(volatile u8 __force *)addr = value;
}
#endif

#ifndef __raw_writew
#define __raw_writew __raw_writew
static inline void __raw_writew(u16 value, volatile void __iomem *addr)
{
	*(volatile u16 __force *)addr = value;
}
#endif

#ifndef __raw_writel
#define __raw_writel __raw_writel
static inline void __raw_writel(u32 value, volatile void __iomem *addr)
{
	*(volatile u32 __force *)addr = value;
}
#endif

#ifdef CONFIG_64BIT
#ifndef __raw_writeq
#define __raw_writeq __raw_writeq
static inline void __raw_writeq(u64 value, volatile void __iomem *addr)
{
	*(volatile u64 __force *)addr = value;
}
#endif
#endif /* CONFIG_64BIT */

/*
 * {read,write}{b,w,l,q}() access little endian memory and return result in
 * native endianness.
 */

#ifndef readb
#define readb readb
static inline u8 readb(const volatile void __iomem *addr)
{
	u8 val;

	log_read_mmio(8, addr, _THIS_IP_, _RET_IP_);
	__io_br();
	val = __raw_readb(addr);
	__io_ar(val);
	log_post_read_mmio(val, 8, addr, _THIS_IP_, _RET_IP_);
	return val;
}
#endif

#ifndef readw
#define readw readw
static inline u16 readw(const volatile void __iomem *addr)
{
	u16 val;

	log_read_mmio(16, addr, _THIS_IP_, _RET_IP_);
	__io_br();
	val = __le16_to_cpu((__le16 __force)__raw_readw(addr));
	__io_ar(val);
	log_post_read_mmio(val, 16, addr, _THIS_IP_, _RET_IP_);
	return val;
}
#endif

#ifndef readl
#define readl readl
static inline u32 readl(const volatile void __iomem *addr)
{
	u32 val;

	log_read_mmio(32, addr, _THIS_IP_, _RET_IP_);
	__io_br();
	val = __le32_to_cpu((__le32 __force)__raw_readl(addr));
	__io_ar(val);
	log_post_read_mmio(val, 32, addr, _THIS_IP_, _RET_IP_);
	return val;
}
#endif

#ifdef CONFIG_64BIT
#ifndef readq
#define readq readq
static inline u64 readq(const volatile void __iomem *addr)
{
	u64 val;

	log_read_mmio(64, addr, _THIS_IP_, _RET_IP_);
	__io_br();
	val = __le64_to_cpu(__raw_readq(addr));
	__io_ar(val);
	log_post_read_mmio(val, 64, addr, _THIS_IP_, _RET_IP_);
	return val;
}
#endif
#endif /* CONFIG_64BIT */

#ifndef writeb
#define writeb writeb
static inline void writeb(u8 value, volatile void __iomem *addr)
{
	log_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
	__io_bw();
	__raw_writeb(value, addr);
	__io_aw();
	log_post_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
}
#endif

#ifndef writew
#define writew writew
static inline void writew(u16 value, volatile void __iomem *addr)
{
	log_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
	__io_bw();
	__raw_writew((u16 __force)cpu_to_le16(value), addr);
	__io_aw();
	log_post_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
}
#endif

#ifndef writel
#define writel writel
static inline void writel(u32 value, volatile void __iomem *addr)
{
	log_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
	__io_bw();
	__raw_writel((u32 __force)__cpu_to_le32(value), addr);
	__io_aw();
	log_post_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
}
#endif

#ifdef CONFIG_64BIT
#ifndef writeq
#define writeq writeq
static inline void writeq(u64 value, volatile void __iomem *addr)
{
	log_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
	__io_bw();
	__raw_writeq(__cpu_to_le64(value), addr);
	__io_aw();
	log_post_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
}
#endif
#endif /* CONFIG_64BIT */

/*
 * {read,write}{b,w,l,q}_relaxed() are like the regular version, but
 * are not guaranteed to provide ordering against spinlocks or memory
 * accesses.
 */
#ifndef readb_relaxed
#define readb_relaxed readb_relaxed
static inline u8 readb_relaxed(const volatile void __iomem *addr)
{
	u8 val;

	log_read_mmio(8, addr, _THIS_IP_, _RET_IP_);
	val = __raw_readb(addr);
	log_post_read_mmio(val, 8, addr, _THIS_IP_, _RET_IP_);
	return val;
}
#endif

#ifndef readw_relaxed
#define readw_relaxed readw_relaxed
static inline u16 readw_relaxed(const volatile void __iomem *addr)
{
	u16 val;

	log_read_mmio(16, addr, _THIS_IP_, _RET_IP_);
	val = __le16_to_cpu(__raw_readw(addr));
	log_post_read_mmio(val, 16, addr, _THIS_IP_, _RET_IP_);
	return val;
}
#endif

#ifndef readl_relaxed
#define readl_relaxed readl_relaxed
static inline u32 readl_relaxed(const volatile void __iomem *addr)
{
	u32 val;

	log_read_mmio(32, addr, _THIS_IP_, _RET_IP_);
	val = __le32_to_cpu(__raw_readl(addr));
	log_post_read_mmio(val, 32, addr, _THIS_IP_, _RET_IP_);
	return val;
}
#endif

#if defined(readq) && !defined(readq_relaxed)
#define readq_relaxed readq_relaxed
static inline u64 readq_relaxed(const volatile void __iomem *addr)
{
	u64 val;

	log_read_mmio(64, addr, _THIS_IP_, _RET_IP_);
	val = __le64_to_cpu(__raw_readq(addr));
	log_post_read_mmio(val, 64, addr, _THIS_IP_, _RET_IP_);
	return val;
}
#endif

#ifndef writeb_relaxed
#define writeb_relaxed writeb_relaxed
static inline void writeb_relaxed(u8 value, volatile void __iomem *addr)
{
	log_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
	__raw_writeb(value, addr);
	log_post_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
}
#endif

#ifndef writew_relaxed
#define writew_relaxed writew_relaxed
static inline void writew_relaxed(u16 value, volatile void __iomem *addr)
{
	log_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
	__raw_writew(cpu_to_le16(value), addr);
	log_post_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
}
#endif

#ifndef writel_relaxed
#define writel_relaxed writel_relaxed
static inline void writel_relaxed(u32 value, volatile void __iomem *addr)
{
	log_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
	__raw_writel(__cpu_to_le32(value), addr);
	log_post_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
}
#endif

#if defined(writeq) && !defined(writeq_relaxed)
#define writeq_relaxed writeq_relaxed
static inline void writeq_relaxed(u64 value, volatile void __iomem *addr)
{
	log_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
	__raw_writeq(__cpu_to_le64(value), addr);
	log_post_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
}
#endif

/*
 * {read,write}s{b,w,l,q}() repeatedly access the same memory address in
 * native endianness in 8-, 16-, 32- or 64-bit chunks (@count times).
 */
#ifndef readsb
#define readsb readsb
static inline void readsb(const volatile void __iomem *addr, void *buffer,
			  unsigned int count)
{
	if (count) {
		u8 *buf = buffer;

		do {
			u8 x = __raw_readb(addr);
			*buf++ = x;
		} while (--count);
	}
}
#endif

#ifndef readsw
#define readsw readsw
static inline void readsw(const volatile void __iomem *addr, void *buffer,
			  unsigned int count)
{
	if (count) {
		u16 *buf = buffer;

		do {
			u16 x = __raw_readw(addr);
			*buf++ = x;
		} while (--count);
	}
}
#endif

#ifndef readsl
#define readsl readsl
static inline void readsl(const volatile void __iomem *addr, void *buffer,
			  unsigned int count)
{
	if (count) {
		u32 *buf = buffer;

		do {
			u32 x = __raw_readl(addr);
			*buf++ = x;
		} while (--count);
	}
}
#endif

#ifdef CONFIG_64BIT
#ifndef readsq
#define readsq readsq
static inline void readsq(const volatile void __iomem *addr, void *buffer,
			  unsigned int count)
{
	if (count) {
		u64 *buf = buffer;

		do {
			u64 x = __raw_readq(addr);
			*buf++ = x;
		} while (--count);
	}
}
#endif
#endif /* CONFIG_64BIT */

#ifndef writesb
#define writesb writesb
static inline void writesb(volatile void __iomem *addr, const void *buffer,
			   unsigned int count)
{
	if (count) {
		const u8 *buf = buffer;

		do {
			__raw_writeb(*buf++, addr);
		} while (--count);
	}
}
#endif

#ifndef writesw
#define writesw writesw
static inline void writesw(volatile void __iomem *addr, const void *buffer,
			   unsigned int count)
{
	if (count) {
		const u16 *buf = buffer;

		do {
			__raw_writew(*buf++, addr);
		} while (--count);
	}
}
#endif

#ifndef writesl
#define writesl writesl
static inline void writesl(volatile void __iomem *addr, const void *buffer,
			   unsigned int count)
{
	if (count) {
		const u32 *buf = buffer;

		do {
			__raw_writel(*buf++, addr);
		} while (--count);
	}
}
#endif

#ifdef CONFIG_64BIT
#ifndef writesq
#define writesq writesq
static inline void writesq(volatile void __iomem *addr, const void *buffer,
			   unsigned int count)
{
	if (count) {
		const u64 *buf = buffer;

		do {
			__raw_writeq(*buf++, addr);
		} while (--count);
	}
}
#endif
#endif /* CONFIG_64BIT */

#ifndef PCI_IOBASE
#define PCI_IOBASE ((void __iomem *)0)
#endif

#ifndef IO_SPACE_LIMIT
#define IO_SPACE_LIMIT 0xffff
#endif

/*
 * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
 * implemented on hardware that needs an additional delay for I/O accesses to
 * take effect.
 */

#if !defined(inb) && !defined(_inb)
#define _inb _inb
static inline u8 _inb(unsigned long addr)
{
	u8 val;

	__io_pbr();
	val = __raw_readb(PCI_IOBASE + addr);
	__io_par(val);
	return val;
}
#endif

#if !defined(inw) && !defined(_inw)
#define _inw _inw
static inline u16 _inw(unsigned long addr)
{
	u16 val;

	__io_pbr();
	val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
	__io_par(val);
	return val;
}
#endif

#if !defined(inl) && !defined(_inl)
#define _inl _inl
static inline u32 _inl(unsigned long addr)
{
	u32 val;

	__io_pbr();
	val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
	__io_par(val);
	return val;
}
#endif

#if !defined(outb) && !defined(_outb)
#define _outb _outb
static inline void _outb(u8 value, unsigned long addr)
{
	__io_pbw();
	__raw_writeb(value, PCI_IOBASE + addr);
	__io_paw();
}
#endif

#if !defined(outw) && !defined(_outw)
#define _outw _outw
static inline void _outw(u16 value, unsigned long addr)
{
	__io_pbw();
	__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
	__io_paw();
}
#endif

#if !defined(outl) && !defined(_outl)
#define _outl _outl
static inline void _outl(u32 value, unsigned long addr)
{
	__io_pbw();
	__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
	__io_paw();
}
#endif

#include <linux/logic_pio.h>

#ifndef inb
#define inb _inb
#endif

#ifndef inw
#define inw _inw
#endif

#ifndef inl
#define inl _inl
#endif

#ifndef outb
#define outb _outb
#endif

#ifndef outw
#define outw _outw
#endif

#ifndef outl
#define outl _outl
#endif

#ifndef inb_p
#define inb_p inb_p
static inline u8 inb_p(unsigned long addr)
{
	return inb(addr);
}
#endif

#ifndef inw_p
#define inw_p inw_p
static inline u16 inw_p(unsigned long addr)
{
	return inw(addr);
}
#endif

#ifndef inl_p
#define inl_p inl_p
static inline u32 inl_p(unsigned long addr)
{
	return inl(addr);
}
#endif

#ifndef outb_p
#define outb_p outb_p
static inline void outb_p(u8 value, unsigned long addr)
{
	outb(value, addr);
}
#endif

#ifndef outw_p
#define outw_p outw_p
static inline void outw_p(u16 value, unsigned long addr)
{
	outw(value, addr);
}
#endif

#ifndef outl_p
#define outl_p outl_p
static inline void outl_p(u32 value, unsigned long addr)
{
	outl(value, addr);
}
#endif

/*
 * {in,out}s{b,w,l}{,_p}() are variants of the above that repeatedly access a
 * single I/O port multiple times.
 */

#ifndef insb
#define insb insb
static inline void insb(unsigned long addr, void *buffer, unsigned int count)
{
	readsb(PCI_IOBASE + addr, buffer, count);
}
#endif

#ifndef insw
#define insw insw
static inline void insw(unsigned long addr, void *buffer, unsigned int count)
{
	readsw(PCI_IOBASE + addr, buffer, count);
}
#endif

#ifndef insl
#define insl insl
static inline void insl(unsigned long addr, void *buffer, unsigned int count)
{
	readsl(PCI_IOBASE + addr, buffer, count);
}
#endif

#ifndef outsb
#define outsb outsb
static inline void outsb(unsigned long addr, const void *buffer,
			 unsigned int count)
{
	writesb(PCI_IOBASE + addr, buffer, count);
}
#endif

#ifndef outsw
#define outsw outsw
static inline void outsw(unsigned long addr, const void *buffer,
			 unsigned int count)
{
	writesw(PCI_IOBASE + addr, buffer, count);
}
#endif

#ifndef outsl
#define outsl outsl
static inline void outsl(unsigned long addr, const void *buffer,
			 unsigned int count)
{
	writesl(PCI_IOBASE + addr, buffer, count);
}
#endif

#ifndef insb_p
#define insb_p insb_p
static inline void insb_p(unsigned long addr, void *buffer, unsigned int count)
{
	insb(addr, buffer, count);
}
#endif

#ifndef insw_p
#define insw_p insw_p
static inline void insw_p(unsigned long addr, void *buffer, unsigned int count)
{
	insw(addr, buffer, count);
}
#endif

#ifndef insl_p
#define insl_p insl_p
static inline void insl_p(unsigned long addr, void *buffer, unsigned int count)
{
	insl(addr, buffer, count);
}
#endif

#ifndef outsb_p
#define outsb_p outsb_p
static inline void outsb_p(unsigned long addr, const void *buffer,
			   unsigned int count)
{
	outsb(addr, buffer, count);
}
#endif

#ifndef outsw_p
#define outsw_p outsw_p
static inline void outsw_p(unsigned long addr, const void *buffer,
			   unsigned int count)
{
	outsw(addr, buffer, count);
}
#endif

#ifndef outsl_p
#define outsl_p outsl_p
static inline void outsl_p(unsigned long addr, const void *buffer,
			   unsigned int count)
{
	outsl(addr, buffer, count);
}
#endif

#ifndef CONFIG_GENERIC_IOMAP
#ifndef ioread8
#define ioread8 ioread8
static inline u8 ioread8(const volatile void __iomem *addr)
{
	return readb(addr);
}
#endif

#ifndef ioread16
#define ioread16 ioread16
static inline u16 ioread16(const volatile void __iomem *addr)
{
	return readw(addr);
}
#endif

#ifndef ioread32
#define ioread32 ioread32
static inline u32 ioread32(const volatile void __iomem *addr)
{
	return readl(addr);
}
#endif

#ifdef CONFIG_64BIT
#ifndef ioread64
#define ioread64 ioread64
static inline u64 ioread64(const volatile void __iomem *addr)
{
	return readq(addr);
}
#endif
#endif /* CONFIG_64BIT */

#ifndef iowrite8
#define iowrite8 iowrite8
static inline void iowrite8(u8 value, volatile void __iomem *addr)
{
	writeb(value, addr);
}
#endif

#ifndef iowrite16
#define iowrite16 iowrite16
static inline void iowrite16(u16 value, volatile void __iomem *addr)
{
	writew(value, addr);
}
#endif

#ifndef iowrite32
#define iowrite32 iowrite32
static inline void iowrite32(u32 value, volatile void __iomem *addr)
{
	writel(value, addr);
}
#endif

#ifdef CONFIG_64BIT
#ifndef iowrite64
#define iowrite64 iowrite64
static inline void iowrite64(u64 value, volatile void __iomem *addr)
{
	writeq(value, addr);
}
#endif
#endif /* CONFIG_64BIT */

#ifndef ioread16be
#define ioread16be ioread16be
static inline u16 ioread16be(const volatile void __iomem *addr)
{
	return swab16(readw(addr));
}
#endif

#ifndef ioread32be
#define ioread32be ioread32be
static inline u32 ioread32be(const volatile void __iomem *addr)
{
	return swab32(readl(addr));
}
#endif

#ifdef CONFIG_64BIT
#ifndef ioread64be
#define ioread64be ioread64be
static inline u64 ioread64be(const volatile void __iomem *addr)
{
	return swab64(readq(addr));
}
#endif
#endif /* CONFIG_64BIT */

#ifndef iowrite16be
#define iowrite16be iowrite16be
static inline void iowrite16be(u16 value, void volatile __iomem *addr)
{
	writew(swab16(value), addr);
}
#endif

#ifndef iowrite32be
#define iowrite32be iowrite32be
static inline void iowrite32be(u32 value, volatile void __iomem *addr)
{
	writel(swab32(value), addr);
}
#endif

#ifdef CONFIG_64BIT
#ifndef iowrite64be
#define iowrite64be iowrite64be
static inline void iowrite64be(u64 value, volatile void __iomem *addr)
{
	writeq(swab64(value), addr);
}
#endif
#endif /* CONFIG_64BIT */

#ifndef ioread8_rep
#define ioread8_rep ioread8_rep
static inline void ioread8_rep(const volatile void __iomem *addr, void *buffer,
			       unsigned int count)
{
	readsb(addr, buffer, count);
}
#endif

#ifndef ioread16_rep
#define ioread16_rep ioread16_rep
static inline void ioread16_rep(const volatile void __iomem *addr,
				void *buffer, unsigned int count)
{
	readsw(addr, buffer, count);
}
#endif

#ifndef ioread32_rep
#define ioread32_rep ioread32_rep
static inline void ioread32_rep(const volatile void __iomem *addr,
				void *buffer, unsigned int count)
{
	readsl(addr, buffer, count);
}
#endif

#ifdef CONFIG_64BIT
#ifndef ioread64_rep
#define ioread64_rep ioread64_rep
static inline void ioread64_rep(const volatile void __iomem *addr,
				void *buffer, unsigned int count)
{
	readsq(addr, buffer, count);
}
#endif
#endif /* CONFIG_64BIT */

#ifndef iowrite8_rep
#define iowrite8_rep iowrite8_rep
static inline void iowrite8_rep(volatile void __iomem *addr,
				const void *buffer,
				unsigned int count)
{
	writesb(addr, buffer, count);
}
#endif

#ifndef iowrite16_rep
#define iowrite16_rep iowrite16_rep
static inline void iowrite16_rep(volatile void __iomem *addr,
				 const void *buffer,
				 unsigned int count)
{
	writesw(addr, buffer, count);
}
#endif

#ifndef iowrite32_rep
#define iowrite32_rep iowrite32_rep
static inline void iowrite32_rep(volatile void __iomem *addr,
				 const void *buffer,
				 unsigned int count)
{
	writesl(addr, buffer, count);
}
#endif

#ifdef CONFIG_64BIT
#ifndef iowrite64_rep
#define iowrite64_rep iowrite64_rep
static inline void iowrite64_rep(volatile void __iomem *addr,
				 const void *buffer,
				 unsigned int count)
{
	writesq(addr, buffer, count);
}
#endif
#endif /* CONFIG_64BIT */
#endif /* CONFIG_GENERIC_IOMAP */

#ifdef __KERNEL__

#include <linux/vmalloc.h>
#define __io_virt(x) ((void __force *)(x))

/*
 * Change virtual addresses to physical addresses and vv.
 * These are pretty trivial
 */
#ifndef virt_to_phys
#define virt_to_phys virt_to_phys
static inline unsigned long virt_to_phys(volatile void *address)
{
	return __pa((unsigned long)address);
}
#endif

#ifndef phys_to_virt
#define phys_to_virt phys_to_virt
static inline void *phys_to_virt(unsigned long address)
{
	return __va(address);
}
#endif

/**
 * DOC: ioremap() and ioremap_*() variants
 *
 * Architectures with an MMU are expected to provide ioremap() and iounmap()
 * themselves or rely on GENERIC_IOREMAP.  For NOMMU architectures we provide
 * a default nop-op implementation that expect that the physical address used
 * for MMIO are already marked as uncached, and can be used as kernel virtual
 * addresses.
 *
 * ioremap_wc() and ioremap_wt() can provide more relaxed caching attributes
 * for specific drivers if the architecture choses to implement them.  If they
 * are not implemented we fall back to plain ioremap. Conversely, ioremap_np()
 * can provide stricter non-posted write semantics if the architecture
 * implements them.
 */
#ifndef CONFIG_MMU
#ifndef ioremap
#define ioremap ioremap
static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
{
	return (void __iomem *)(unsigned long)offset;
}
#endif

#ifndef iounmap
#define iounmap iounmap
static inline void iounmap(volatile void __iomem *addr)
{
}
#endif
#elif defined(CONFIG_GENERIC_IOREMAP)
#include <linux/pgtable.h>

/*
 * Arch code can implement the following two hooks when using GENERIC_IOREMAP
 * ioremap_allowed() return a bool,
 *   - true means continue to remap
 *   - false means skip remap and return directly
 * iounmap_allowed() return a bool,
 *   - true means continue to vunmap
 *   - false means skip vunmap and return directly
 */
#ifndef ioremap_allowed
#define ioremap_allowed ioremap_allowed
static inline bool ioremap_allowed(phys_addr_t phys_addr, size_t size,
				   unsigned long prot)
{
	return true;
}
#endif

#ifndef iounmap_allowed
#define iounmap_allowed iounmap_allowed
static inline bool iounmap_allowed(void *addr)
{
	return true;
}
#endif

void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
			   unsigned long prot);
void iounmap(volatile void __iomem *addr);

static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
{
	/* _PAGE_IOREMAP needs to be supplied by the architecture */
	return ioremap_prot(addr, size, _PAGE_IOREMAP);
}
#endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */

#ifndef ioremap_wc
#define ioremap_wc ioremap
#endif

#ifndef ioremap_wt
#define ioremap_wt ioremap
#endif

/*
 * ioremap_uc is special in that we do require an explicit architecture
 * implementation.  In general you do not want to use this function in a
 * driver and use plain ioremap, which is uncached by default.  Similarly
 * architectures should not implement it unless they have a very good
 * reason.
 */
#ifndef ioremap_uc
#define ioremap_uc ioremap_uc
static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
{
	return NULL;
}
#endif

/*
 * ioremap_np needs an explicit architecture implementation, as it
 * requests stronger semantics than regular ioremap(). Portable drivers
 * should instead use one of the higher-level abstractions, like
 * devm_ioremap_resource(), to choose the correct variant for any given
 * device and bus. Portable drivers with a good reason to want non-posted
 * write semantics should always provide an ioremap() fallback in case
 * ioremap_np() is not available.
 */
#ifndef ioremap_np
#define ioremap_np ioremap_np
static inline void __iomem *ioremap_np(phys_addr_t offset, size_t size)
{
	return NULL;
}
#endif

#ifdef CONFIG_HAS_IOPORT_MAP
#ifndef CONFIG_GENERIC_IOMAP
#ifndef ioport_map
#define ioport_map ioport_map
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
	port &= IO_SPACE_LIMIT;
	return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
}
#define ARCH_HAS_GENERIC_IOPORT_MAP
#endif

#ifndef ioport_unmap
#define ioport_unmap ioport_unmap
static inline void ioport_unmap(void __iomem *p)
{
}
#endif
#else /* CONFIG_GENERIC_IOMAP */
extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
extern void ioport_unmap(void __iomem *p);
#endif /* CONFIG_GENERIC_IOMAP */
#endif /* CONFIG_HAS_IOPORT_MAP */

#ifndef CONFIG_GENERIC_IOMAP
#ifndef pci_iounmap
#define ARCH_WANTS_GENERIC_PCI_IOUNMAP
#endif
#endif

#ifndef xlate_dev_mem_ptr
#define xlate_dev_mem_ptr xlate_dev_mem_ptr
static inline void *xlate_dev_mem_ptr(phys_addr_t addr)
{
	return __va(addr);
}
#endif

#ifndef unxlate_dev_mem_ptr
#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
{
}
#endif

#ifndef memset_io
#define memset_io memset_io
/**
 * memset_io	Set a range of I/O memory to a constant value
 * @addr:	The beginning of the I/O-memory range to set
 * @val:	The value to set the memory to
 * @count:	The number of bytes to set
 *
 * Set a range of I/O memory to a given value.
 */
static inline void memset_io(volatile void __iomem *addr, int value,
			     size_t size)
{
	memset(__io_virt(addr), value, size);
}
#endif

#ifndef memcpy_fromio
#define memcpy_fromio memcpy_fromio
/**
 * memcpy_fromio	Copy a block of data from I/O memory
 * @dst:		The (RAM) destination for the copy
 * @src:		The (I/O memory) source for the data
 * @count:		The number of bytes to copy
 *
 * Copy a block of data from I/O memory.
 */
static inline void memcpy_fromio(void *buffer,
				 const volatile void __iomem *addr,
				 size_t size)
{
	memcpy(buffer, __io_virt(addr), size);
}
#endif

#ifndef memcpy_toio
#define memcpy_toio memcpy_toio
/**
 * memcpy_toio		Copy a block of data into I/O memory
 * @dst:		The (I/O memory) destination for the copy
 * @src:		The (RAM) source for the data
 * @count:		The number of bytes to copy
 *
 * Copy a block of data to I/O memory.
 */
static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
			       size_t size)
{
	memcpy(__io_virt(addr), buffer, size);
}
#endif

extern int devmem_is_allowed(unsigned long pfn);

#endif /* __KERNEL__ */

#endif /* __ASM_GENERIC_IO_H */