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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* Generic I/O port emulation.
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7#ifndef __ASM_GENERIC_IO_H
8#define __ASM_GENERIC_IO_H
9
10#include <asm/page.h> /* I/O is all done through memory accesses */
11#include <linux/string.h> /* for memset() and memcpy() */
12#include <linux/types.h>
13
14#ifdef CONFIG_GENERIC_IOMAP
15#include <asm-generic/iomap.h>
16#endif
17
18#include <asm/mmiowb.h>
19#include <asm-generic/pci_iomap.h>
20
21#ifndef __io_br
22#define __io_br() barrier()
23#endif
24
25/* prevent prefetching of coherent DMA data ahead of a dma-complete */
26#ifndef __io_ar
27#ifdef rmb
28#define __io_ar(v) rmb()
29#else
30#define __io_ar(v) barrier()
31#endif
32#endif
33
34/* flush writes to coherent DMA data before possibly triggering a DMA read */
35#ifndef __io_bw
36#ifdef wmb
37#define __io_bw() wmb()
38#else
39#define __io_bw() barrier()
40#endif
41#endif
42
43/* serialize device access against a spin_unlock, usually handled there. */
44#ifndef __io_aw
45#define __io_aw() mmiowb_set_pending()
46#endif
47
48#ifndef __io_pbw
49#define __io_pbw() __io_bw()
50#endif
51
52#ifndef __io_paw
53#define __io_paw() __io_aw()
54#endif
55
56#ifndef __io_pbr
57#define __io_pbr() __io_br()
58#endif
59
60#ifndef __io_par
61#define __io_par(v) __io_ar(v)
62#endif
63
64
65/*
66 * __raw_{read,write}{b,w,l,q}() access memory in native endianness.
67 *
68 * On some architectures memory mapped IO needs to be accessed differently.
69 * On the simple architectures, we just read/write the memory location
70 * directly.
71 */
72
73#ifndef __raw_readb
74#define __raw_readb __raw_readb
75static inline u8 __raw_readb(const volatile void __iomem *addr)
76{
77 return *(const volatile u8 __force *)addr;
78}
79#endif
80
81#ifndef __raw_readw
82#define __raw_readw __raw_readw
83static inline u16 __raw_readw(const volatile void __iomem *addr)
84{
85 return *(const volatile u16 __force *)addr;
86}
87#endif
88
89#ifndef __raw_readl
90#define __raw_readl __raw_readl
91static inline u32 __raw_readl(const volatile void __iomem *addr)
92{
93 return *(const volatile u32 __force *)addr;
94}
95#endif
96
97#ifdef CONFIG_64BIT
98#ifndef __raw_readq
99#define __raw_readq __raw_readq
100static inline u64 __raw_readq(const volatile void __iomem *addr)
101{
102 return *(const volatile u64 __force *)addr;
103}
104#endif
105#endif /* CONFIG_64BIT */
106
107#ifndef __raw_writeb
108#define __raw_writeb __raw_writeb
109static inline void __raw_writeb(u8 value, volatile void __iomem *addr)
110{
111 *(volatile u8 __force *)addr = value;
112}
113#endif
114
115#ifndef __raw_writew
116#define __raw_writew __raw_writew
117static inline void __raw_writew(u16 value, volatile void __iomem *addr)
118{
119 *(volatile u16 __force *)addr = value;
120}
121#endif
122
123#ifndef __raw_writel
124#define __raw_writel __raw_writel
125static inline void __raw_writel(u32 value, volatile void __iomem *addr)
126{
127 *(volatile u32 __force *)addr = value;
128}
129#endif
130
131#ifdef CONFIG_64BIT
132#ifndef __raw_writeq
133#define __raw_writeq __raw_writeq
134static inline void __raw_writeq(u64 value, volatile void __iomem *addr)
135{
136 *(volatile u64 __force *)addr = value;
137}
138#endif
139#endif /* CONFIG_64BIT */
140
141/*
142 * {read,write}{b,w,l,q}() access little endian memory and return result in
143 * native endianness.
144 */
145
146#ifndef readb
147#define readb readb
148static inline u8 readb(const volatile void __iomem *addr)
149{
150 u8 val;
151
152 __io_br();
153 val = __raw_readb(addr);
154 __io_ar(val);
155 return val;
156}
157#endif
158
159#ifndef readw
160#define readw readw
161static inline u16 readw(const volatile void __iomem *addr)
162{
163 u16 val;
164
165 __io_br();
166 val = __le16_to_cpu(__raw_readw(addr));
167 __io_ar(val);
168 return val;
169}
170#endif
171
172#ifndef readl
173#define readl readl
174static inline u32 readl(const volatile void __iomem *addr)
175{
176 u32 val;
177
178 __io_br();
179 val = __le32_to_cpu(__raw_readl(addr));
180 __io_ar(val);
181 return val;
182}
183#endif
184
185#ifdef CONFIG_64BIT
186#ifndef readq
187#define readq readq
188static inline u64 readq(const volatile void __iomem *addr)
189{
190 u64 val;
191
192 __io_br();
193 val = __le64_to_cpu(__raw_readq(addr));
194 __io_ar(val);
195 return val;
196}
197#endif
198#endif /* CONFIG_64BIT */
199
200#ifndef writeb
201#define writeb writeb
202static inline void writeb(u8 value, volatile void __iomem *addr)
203{
204 __io_bw();
205 __raw_writeb(value, addr);
206 __io_aw();
207}
208#endif
209
210#ifndef writew
211#define writew writew
212static inline void writew(u16 value, volatile void __iomem *addr)
213{
214 __io_bw();
215 __raw_writew(cpu_to_le16(value), addr);
216 __io_aw();
217}
218#endif
219
220#ifndef writel
221#define writel writel
222static inline void writel(u32 value, volatile void __iomem *addr)
223{
224 __io_bw();
225 __raw_writel(__cpu_to_le32(value), addr);
226 __io_aw();
227}
228#endif
229
230#ifdef CONFIG_64BIT
231#ifndef writeq
232#define writeq writeq
233static inline void writeq(u64 value, volatile void __iomem *addr)
234{
235 __io_bw();
236 __raw_writeq(__cpu_to_le64(value), addr);
237 __io_aw();
238}
239#endif
240#endif /* CONFIG_64BIT */
241
242/*
243 * {read,write}{b,w,l,q}_relaxed() are like the regular version, but
244 * are not guaranteed to provide ordering against spinlocks or memory
245 * accesses.
246 */
247#ifndef readb_relaxed
248#define readb_relaxed readb_relaxed
249static inline u8 readb_relaxed(const volatile void __iomem *addr)
250{
251 return __raw_readb(addr);
252}
253#endif
254
255#ifndef readw_relaxed
256#define readw_relaxed readw_relaxed
257static inline u16 readw_relaxed(const volatile void __iomem *addr)
258{
259 return __le16_to_cpu(__raw_readw(addr));
260}
261#endif
262
263#ifndef readl_relaxed
264#define readl_relaxed readl_relaxed
265static inline u32 readl_relaxed(const volatile void __iomem *addr)
266{
267 return __le32_to_cpu(__raw_readl(addr));
268}
269#endif
270
271#if defined(readq) && !defined(readq_relaxed)
272#define readq_relaxed readq_relaxed
273static inline u64 readq_relaxed(const volatile void __iomem *addr)
274{
275 return __le64_to_cpu(__raw_readq(addr));
276}
277#endif
278
279#ifndef writeb_relaxed
280#define writeb_relaxed writeb_relaxed
281static inline void writeb_relaxed(u8 value, volatile void __iomem *addr)
282{
283 __raw_writeb(value, addr);
284}
285#endif
286
287#ifndef writew_relaxed
288#define writew_relaxed writew_relaxed
289static inline void writew_relaxed(u16 value, volatile void __iomem *addr)
290{
291 __raw_writew(cpu_to_le16(value), addr);
292}
293#endif
294
295#ifndef writel_relaxed
296#define writel_relaxed writel_relaxed
297static inline void writel_relaxed(u32 value, volatile void __iomem *addr)
298{
299 __raw_writel(__cpu_to_le32(value), addr);
300}
301#endif
302
303#if defined(writeq) && !defined(writeq_relaxed)
304#define writeq_relaxed writeq_relaxed
305static inline void writeq_relaxed(u64 value, volatile void __iomem *addr)
306{
307 __raw_writeq(__cpu_to_le64(value), addr);
308}
309#endif
310
311/*
312 * {read,write}s{b,w,l,q}() repeatedly access the same memory address in
313 * native endianness in 8-, 16-, 32- or 64-bit chunks (@count times).
314 */
315#ifndef readsb
316#define readsb readsb
317static inline void readsb(const volatile void __iomem *addr, void *buffer,
318 unsigned int count)
319{
320 if (count) {
321 u8 *buf = buffer;
322
323 do {
324 u8 x = __raw_readb(addr);
325 *buf++ = x;
326 } while (--count);
327 }
328}
329#endif
330
331#ifndef readsw
332#define readsw readsw
333static inline void readsw(const volatile void __iomem *addr, void *buffer,
334 unsigned int count)
335{
336 if (count) {
337 u16 *buf = buffer;
338
339 do {
340 u16 x = __raw_readw(addr);
341 *buf++ = x;
342 } while (--count);
343 }
344}
345#endif
346
347#ifndef readsl
348#define readsl readsl
349static inline void readsl(const volatile void __iomem *addr, void *buffer,
350 unsigned int count)
351{
352 if (count) {
353 u32 *buf = buffer;
354
355 do {
356 u32 x = __raw_readl(addr);
357 *buf++ = x;
358 } while (--count);
359 }
360}
361#endif
362
363#ifdef CONFIG_64BIT
364#ifndef readsq
365#define readsq readsq
366static inline void readsq(const volatile void __iomem *addr, void *buffer,
367 unsigned int count)
368{
369 if (count) {
370 u64 *buf = buffer;
371
372 do {
373 u64 x = __raw_readq(addr);
374 *buf++ = x;
375 } while (--count);
376 }
377}
378#endif
379#endif /* CONFIG_64BIT */
380
381#ifndef writesb
382#define writesb writesb
383static inline void writesb(volatile void __iomem *addr, const void *buffer,
384 unsigned int count)
385{
386 if (count) {
387 const u8 *buf = buffer;
388
389 do {
390 __raw_writeb(*buf++, addr);
391 } while (--count);
392 }
393}
394#endif
395
396#ifndef writesw
397#define writesw writesw
398static inline void writesw(volatile void __iomem *addr, const void *buffer,
399 unsigned int count)
400{
401 if (count) {
402 const u16 *buf = buffer;
403
404 do {
405 __raw_writew(*buf++, addr);
406 } while (--count);
407 }
408}
409#endif
410
411#ifndef writesl
412#define writesl writesl
413static inline void writesl(volatile void __iomem *addr, const void *buffer,
414 unsigned int count)
415{
416 if (count) {
417 const u32 *buf = buffer;
418
419 do {
420 __raw_writel(*buf++, addr);
421 } while (--count);
422 }
423}
424#endif
425
426#ifdef CONFIG_64BIT
427#ifndef writesq
428#define writesq writesq
429static inline void writesq(volatile void __iomem *addr, const void *buffer,
430 unsigned int count)
431{
432 if (count) {
433 const u64 *buf = buffer;
434
435 do {
436 __raw_writeq(*buf++, addr);
437 } while (--count);
438 }
439}
440#endif
441#endif /* CONFIG_64BIT */
442
443#ifndef PCI_IOBASE
444#define PCI_IOBASE ((void __iomem *)0)
445#endif
446
447#ifndef IO_SPACE_LIMIT
448#define IO_SPACE_LIMIT 0xffff
449#endif
450
451#include <linux/logic_pio.h>
452
453/*
454 * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
455 * implemented on hardware that needs an additional delay for I/O accesses to
456 * take effect.
457 */
458
459#ifndef inb
460#define inb inb
461static inline u8 inb(unsigned long addr)
462{
463 u8 val;
464
465 __io_pbr();
466 val = __raw_readb(PCI_IOBASE + addr);
467 __io_par(val);
468 return val;
469}
470#endif
471
472#ifndef inw
473#define inw inw
474static inline u16 inw(unsigned long addr)
475{
476 u16 val;
477
478 __io_pbr();
479 val = __le16_to_cpu(__raw_readw(PCI_IOBASE + addr));
480 __io_par(val);
481 return val;
482}
483#endif
484
485#ifndef inl
486#define inl inl
487static inline u32 inl(unsigned long addr)
488{
489 u32 val;
490
491 __io_pbr();
492 val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
493 __io_par(val);
494 return val;
495}
496#endif
497
498#ifndef outb
499#define outb outb
500static inline void outb(u8 value, unsigned long addr)
501{
502 __io_pbw();
503 __raw_writeb(value, PCI_IOBASE + addr);
504 __io_paw();
505}
506#endif
507
508#ifndef outw
509#define outw outw
510static inline void outw(u16 value, unsigned long addr)
511{
512 __io_pbw();
513 __raw_writew(cpu_to_le16(value), PCI_IOBASE + addr);
514 __io_paw();
515}
516#endif
517
518#ifndef outl
519#define outl outl
520static inline void outl(u32 value, unsigned long addr)
521{
522 __io_pbw();
523 __raw_writel(cpu_to_le32(value), PCI_IOBASE + addr);
524 __io_paw();
525}
526#endif
527
528#ifndef inb_p
529#define inb_p inb_p
530static inline u8 inb_p(unsigned long addr)
531{
532 return inb(addr);
533}
534#endif
535
536#ifndef inw_p
537#define inw_p inw_p
538static inline u16 inw_p(unsigned long addr)
539{
540 return inw(addr);
541}
542#endif
543
544#ifndef inl_p
545#define inl_p inl_p
546static inline u32 inl_p(unsigned long addr)
547{
548 return inl(addr);
549}
550#endif
551
552#ifndef outb_p
553#define outb_p outb_p
554static inline void outb_p(u8 value, unsigned long addr)
555{
556 outb(value, addr);
557}
558#endif
559
560#ifndef outw_p
561#define outw_p outw_p
562static inline void outw_p(u16 value, unsigned long addr)
563{
564 outw(value, addr);
565}
566#endif
567
568#ifndef outl_p
569#define outl_p outl_p
570static inline void outl_p(u32 value, unsigned long addr)
571{
572 outl(value, addr);
573}
574#endif
575
576/*
577 * {in,out}s{b,w,l}{,_p}() are variants of the above that repeatedly access a
578 * single I/O port multiple times.
579 */
580
581#ifndef insb
582#define insb insb
583static inline void insb(unsigned long addr, void *buffer, unsigned int count)
584{
585 readsb(PCI_IOBASE + addr, buffer, count);
586}
587#endif
588
589#ifndef insw
590#define insw insw
591static inline void insw(unsigned long addr, void *buffer, unsigned int count)
592{
593 readsw(PCI_IOBASE + addr, buffer, count);
594}
595#endif
596
597#ifndef insl
598#define insl insl
599static inline void insl(unsigned long addr, void *buffer, unsigned int count)
600{
601 readsl(PCI_IOBASE + addr, buffer, count);
602}
603#endif
604
605#ifndef outsb
606#define outsb outsb
607static inline void outsb(unsigned long addr, const void *buffer,
608 unsigned int count)
609{
610 writesb(PCI_IOBASE + addr, buffer, count);
611}
612#endif
613
614#ifndef outsw
615#define outsw outsw
616static inline void outsw(unsigned long addr, const void *buffer,
617 unsigned int count)
618{
619 writesw(PCI_IOBASE + addr, buffer, count);
620}
621#endif
622
623#ifndef outsl
624#define outsl outsl
625static inline void outsl(unsigned long addr, const void *buffer,
626 unsigned int count)
627{
628 writesl(PCI_IOBASE + addr, buffer, count);
629}
630#endif
631
632#ifndef insb_p
633#define insb_p insb_p
634static inline void insb_p(unsigned long addr, void *buffer, unsigned int count)
635{
636 insb(addr, buffer, count);
637}
638#endif
639
640#ifndef insw_p
641#define insw_p insw_p
642static inline void insw_p(unsigned long addr, void *buffer, unsigned int count)
643{
644 insw(addr, buffer, count);
645}
646#endif
647
648#ifndef insl_p
649#define insl_p insl_p
650static inline void insl_p(unsigned long addr, void *buffer, unsigned int count)
651{
652 insl(addr, buffer, count);
653}
654#endif
655
656#ifndef outsb_p
657#define outsb_p outsb_p
658static inline void outsb_p(unsigned long addr, const void *buffer,
659 unsigned int count)
660{
661 outsb(addr, buffer, count);
662}
663#endif
664
665#ifndef outsw_p
666#define outsw_p outsw_p
667static inline void outsw_p(unsigned long addr, const void *buffer,
668 unsigned int count)
669{
670 outsw(addr, buffer, count);
671}
672#endif
673
674#ifndef outsl_p
675#define outsl_p outsl_p
676static inline void outsl_p(unsigned long addr, const void *buffer,
677 unsigned int count)
678{
679 outsl(addr, buffer, count);
680}
681#endif
682
683#ifndef CONFIG_GENERIC_IOMAP
684#ifndef ioread8
685#define ioread8 ioread8
686static inline u8 ioread8(const volatile void __iomem *addr)
687{
688 return readb(addr);
689}
690#endif
691
692#ifndef ioread16
693#define ioread16 ioread16
694static inline u16 ioread16(const volatile void __iomem *addr)
695{
696 return readw(addr);
697}
698#endif
699
700#ifndef ioread32
701#define ioread32 ioread32
702static inline u32 ioread32(const volatile void __iomem *addr)
703{
704 return readl(addr);
705}
706#endif
707
708#ifdef CONFIG_64BIT
709#ifndef ioread64
710#define ioread64 ioread64
711static inline u64 ioread64(const volatile void __iomem *addr)
712{
713 return readq(addr);
714}
715#endif
716#endif /* CONFIG_64BIT */
717
718#ifndef iowrite8
719#define iowrite8 iowrite8
720static inline void iowrite8(u8 value, volatile void __iomem *addr)
721{
722 writeb(value, addr);
723}
724#endif
725
726#ifndef iowrite16
727#define iowrite16 iowrite16
728static inline void iowrite16(u16 value, volatile void __iomem *addr)
729{
730 writew(value, addr);
731}
732#endif
733
734#ifndef iowrite32
735#define iowrite32 iowrite32
736static inline void iowrite32(u32 value, volatile void __iomem *addr)
737{
738 writel(value, addr);
739}
740#endif
741
742#ifdef CONFIG_64BIT
743#ifndef iowrite64
744#define iowrite64 iowrite64
745static inline void iowrite64(u64 value, volatile void __iomem *addr)
746{
747 writeq(value, addr);
748}
749#endif
750#endif /* CONFIG_64BIT */
751
752#ifndef ioread16be
753#define ioread16be ioread16be
754static inline u16 ioread16be(const volatile void __iomem *addr)
755{
756 return swab16(readw(addr));
757}
758#endif
759
760#ifndef ioread32be
761#define ioread32be ioread32be
762static inline u32 ioread32be(const volatile void __iomem *addr)
763{
764 return swab32(readl(addr));
765}
766#endif
767
768#ifdef CONFIG_64BIT
769#ifndef ioread64be
770#define ioread64be ioread64be
771static inline u64 ioread64be(const volatile void __iomem *addr)
772{
773 return swab64(readq(addr));
774}
775#endif
776#endif /* CONFIG_64BIT */
777
778#ifndef iowrite16be
779#define iowrite16be iowrite16be
780static inline void iowrite16be(u16 value, void volatile __iomem *addr)
781{
782 writew(swab16(value), addr);
783}
784#endif
785
786#ifndef iowrite32be
787#define iowrite32be iowrite32be
788static inline void iowrite32be(u32 value, volatile void __iomem *addr)
789{
790 writel(swab32(value), addr);
791}
792#endif
793
794#ifdef CONFIG_64BIT
795#ifndef iowrite64be
796#define iowrite64be iowrite64be
797static inline void iowrite64be(u64 value, volatile void __iomem *addr)
798{
799 writeq(swab64(value), addr);
800}
801#endif
802#endif /* CONFIG_64BIT */
803
804#ifndef ioread8_rep
805#define ioread8_rep ioread8_rep
806static inline void ioread8_rep(const volatile void __iomem *addr, void *buffer,
807 unsigned int count)
808{
809 readsb(addr, buffer, count);
810}
811#endif
812
813#ifndef ioread16_rep
814#define ioread16_rep ioread16_rep
815static inline void ioread16_rep(const volatile void __iomem *addr,
816 void *buffer, unsigned int count)
817{
818 readsw(addr, buffer, count);
819}
820#endif
821
822#ifndef ioread32_rep
823#define ioread32_rep ioread32_rep
824static inline void ioread32_rep(const volatile void __iomem *addr,
825 void *buffer, unsigned int count)
826{
827 readsl(addr, buffer, count);
828}
829#endif
830
831#ifdef CONFIG_64BIT
832#ifndef ioread64_rep
833#define ioread64_rep ioread64_rep
834static inline void ioread64_rep(const volatile void __iomem *addr,
835 void *buffer, unsigned int count)
836{
837 readsq(addr, buffer, count);
838}
839#endif
840#endif /* CONFIG_64BIT */
841
842#ifndef iowrite8_rep
843#define iowrite8_rep iowrite8_rep
844static inline void iowrite8_rep(volatile void __iomem *addr,
845 const void *buffer,
846 unsigned int count)
847{
848 writesb(addr, buffer, count);
849}
850#endif
851
852#ifndef iowrite16_rep
853#define iowrite16_rep iowrite16_rep
854static inline void iowrite16_rep(volatile void __iomem *addr,
855 const void *buffer,
856 unsigned int count)
857{
858 writesw(addr, buffer, count);
859}
860#endif
861
862#ifndef iowrite32_rep
863#define iowrite32_rep iowrite32_rep
864static inline void iowrite32_rep(volatile void __iomem *addr,
865 const void *buffer,
866 unsigned int count)
867{
868 writesl(addr, buffer, count);
869}
870#endif
871
872#ifdef CONFIG_64BIT
873#ifndef iowrite64_rep
874#define iowrite64_rep iowrite64_rep
875static inline void iowrite64_rep(volatile void __iomem *addr,
876 const void *buffer,
877 unsigned int count)
878{
879 writesq(addr, buffer, count);
880}
881#endif
882#endif /* CONFIG_64BIT */
883#endif /* CONFIG_GENERIC_IOMAP */
884
885#ifdef __KERNEL__
886
887#include <linux/vmalloc.h>
888#define __io_virt(x) ((void __force *)(x))
889
890#ifndef CONFIG_GENERIC_IOMAP
891struct pci_dev;
892extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
893
894#ifndef pci_iounmap
895#define pci_iounmap pci_iounmap
896static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
897{
898}
899#endif
900#endif /* CONFIG_GENERIC_IOMAP */
901
902/*
903 * Change virtual addresses to physical addresses and vv.
904 * These are pretty trivial
905 */
906#ifndef virt_to_phys
907#define virt_to_phys virt_to_phys
908static inline unsigned long virt_to_phys(volatile void *address)
909{
910 return __pa((unsigned long)address);
911}
912#endif
913
914#ifndef phys_to_virt
915#define phys_to_virt phys_to_virt
916static inline void *phys_to_virt(unsigned long address)
917{
918 return __va(address);
919}
920#endif
921
922/**
923 * DOC: ioremap() and ioremap_*() variants
924 *
925 * If you have an IOMMU your architecture is expected to have both ioremap()
926 * and iounmap() implemented otherwise the asm-generic helpers will provide a
927 * direct mapping.
928 *
929 * There are ioremap_*() call variants, if you have no IOMMU we naturally will
930 * default to direct mapping for all of them, you can override these defaults.
931 * If you have an IOMMU you are highly encouraged to provide your own
932 * ioremap variant implementation as there currently is no safe architecture
933 * agnostic default. To avoid possible improper behaviour default asm-generic
934 * ioremap_*() variants all return NULL when an IOMMU is available. If you've
935 * defined your own ioremap_*() variant you must then declare your own
936 * ioremap_*() variant as defined to itself to avoid the default NULL return.
937 */
938
939#ifdef CONFIG_MMU
940
941#ifndef ioremap_uc
942#define ioremap_uc ioremap_uc
943static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
944{
945 return NULL;
946}
947#endif
948
949#else /* !CONFIG_MMU */
950
951/*
952 * Change "struct page" to physical address.
953 *
954 * This implementation is for the no-MMU case only... if you have an MMU
955 * you'll need to provide your own definitions.
956 */
957
958#ifndef ioremap
959#define ioremap ioremap
960static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
961{
962 return (void __iomem *)(unsigned long)offset;
963}
964#endif
965
966#ifndef iounmap
967#define iounmap iounmap
968
969static inline void iounmap(void __iomem *addr)
970{
971}
972#endif
973#endif /* CONFIG_MMU */
974#ifndef ioremap_nocache
975void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
976#define ioremap_nocache ioremap_nocache
977static inline void __iomem *ioremap_nocache(phys_addr_t offset, size_t size)
978{
979 return ioremap(offset, size);
980}
981#endif
982
983#ifndef ioremap_uc
984#define ioremap_uc ioremap_uc
985static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
986{
987 return ioremap_nocache(offset, size);
988}
989#endif
990
991#ifndef ioremap_wc
992#define ioremap_wc ioremap_wc
993static inline void __iomem *ioremap_wc(phys_addr_t offset, size_t size)
994{
995 return ioremap_nocache(offset, size);
996}
997#endif
998
999#ifndef ioremap_wt
1000#define ioremap_wt ioremap_wt
1001static inline void __iomem *ioremap_wt(phys_addr_t offset, size_t size)
1002{
1003 return ioremap_nocache(offset, size);
1004}
1005#endif
1006
1007#ifdef CONFIG_HAS_IOPORT_MAP
1008#ifndef CONFIG_GENERIC_IOMAP
1009#ifndef ioport_map
1010#define ioport_map ioport_map
1011static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
1012{
1013 port &= IO_SPACE_LIMIT;
1014 return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
1015}
1016#endif
1017
1018#ifndef ioport_unmap
1019#define ioport_unmap ioport_unmap
1020static inline void ioport_unmap(void __iomem *p)
1021{
1022}
1023#endif
1024#else /* CONFIG_GENERIC_IOMAP */
1025extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
1026extern void ioport_unmap(void __iomem *p);
1027#endif /* CONFIG_GENERIC_IOMAP */
1028#endif /* CONFIG_HAS_IOPORT_MAP */
1029
1030/*
1031 * Convert a virtual cached pointer to an uncached pointer
1032 */
1033#ifndef xlate_dev_kmem_ptr
1034#define xlate_dev_kmem_ptr xlate_dev_kmem_ptr
1035static inline void *xlate_dev_kmem_ptr(void *addr)
1036{
1037 return addr;
1038}
1039#endif
1040
1041#ifndef xlate_dev_mem_ptr
1042#define xlate_dev_mem_ptr xlate_dev_mem_ptr
1043static inline void *xlate_dev_mem_ptr(phys_addr_t addr)
1044{
1045 return __va(addr);
1046}
1047#endif
1048
1049#ifndef unxlate_dev_mem_ptr
1050#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
1051static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
1052{
1053}
1054#endif
1055
1056#ifdef CONFIG_VIRT_TO_BUS
1057#ifndef virt_to_bus
1058static inline unsigned long virt_to_bus(void *address)
1059{
1060 return (unsigned long)address;
1061}
1062
1063static inline void *bus_to_virt(unsigned long address)
1064{
1065 return (void *)address;
1066}
1067#endif
1068#endif
1069
1070#ifndef memset_io
1071#define memset_io memset_io
1072/**
1073 * memset_io Set a range of I/O memory to a constant value
1074 * @addr: The beginning of the I/O-memory range to set
1075 * @val: The value to set the memory to
1076 * @count: The number of bytes to set
1077 *
1078 * Set a range of I/O memory to a given value.
1079 */
1080static inline void memset_io(volatile void __iomem *addr, int value,
1081 size_t size)
1082{
1083 memset(__io_virt(addr), value, size);
1084}
1085#endif
1086
1087#ifndef memcpy_fromio
1088#define memcpy_fromio memcpy_fromio
1089/**
1090 * memcpy_fromio Copy a block of data from I/O memory
1091 * @dst: The (RAM) destination for the copy
1092 * @src: The (I/O memory) source for the data
1093 * @count: The number of bytes to copy
1094 *
1095 * Copy a block of data from I/O memory.
1096 */
1097static inline void memcpy_fromio(void *buffer,
1098 const volatile void __iomem *addr,
1099 size_t size)
1100{
1101 memcpy(buffer, __io_virt(addr), size);
1102}
1103#endif
1104
1105#ifndef memcpy_toio
1106#define memcpy_toio memcpy_toio
1107/**
1108 * memcpy_toio Copy a block of data into I/O memory
1109 * @dst: The (I/O memory) destination for the copy
1110 * @src: The (RAM) source for the data
1111 * @count: The number of bytes to copy
1112 *
1113 * Copy a block of data to I/O memory.
1114 */
1115static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
1116 size_t size)
1117{
1118 memcpy(__io_virt(addr), buffer, size);
1119}
1120#endif
1121
1122#endif /* __KERNEL__ */
1123
1124#endif /* __ASM_GENERIC_IO_H */
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* Generic I/O port emulation.
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7#ifndef __ASM_GENERIC_IO_H
8#define __ASM_GENERIC_IO_H
9
10#include <asm/page.h> /* I/O is all done through memory accesses */
11#include <linux/string.h> /* for memset() and memcpy() */
12#include <linux/types.h>
13
14#ifdef CONFIG_GENERIC_IOMAP
15#include <asm-generic/iomap.h>
16#endif
17
18#include <asm/mmiowb.h>
19#include <asm-generic/pci_iomap.h>
20
21#ifndef __io_br
22#define __io_br() barrier()
23#endif
24
25/* prevent prefetching of coherent DMA data ahead of a dma-complete */
26#ifndef __io_ar
27#ifdef rmb
28#define __io_ar(v) rmb()
29#else
30#define __io_ar(v) barrier()
31#endif
32#endif
33
34/* flush writes to coherent DMA data before possibly triggering a DMA read */
35#ifndef __io_bw
36#ifdef wmb
37#define __io_bw() wmb()
38#else
39#define __io_bw() barrier()
40#endif
41#endif
42
43/* serialize device access against a spin_unlock, usually handled there. */
44#ifndef __io_aw
45#define __io_aw() mmiowb_set_pending()
46#endif
47
48#ifndef __io_pbw
49#define __io_pbw() __io_bw()
50#endif
51
52#ifndef __io_paw
53#define __io_paw() __io_aw()
54#endif
55
56#ifndef __io_pbr
57#define __io_pbr() __io_br()
58#endif
59
60#ifndef __io_par
61#define __io_par(v) __io_ar(v)
62#endif
63
64
65/*
66 * __raw_{read,write}{b,w,l,q}() access memory in native endianness.
67 *
68 * On some architectures memory mapped IO needs to be accessed differently.
69 * On the simple architectures, we just read/write the memory location
70 * directly.
71 */
72
73#ifndef __raw_readb
74#define __raw_readb __raw_readb
75static inline u8 __raw_readb(const volatile void __iomem *addr)
76{
77 return *(const volatile u8 __force *)addr;
78}
79#endif
80
81#ifndef __raw_readw
82#define __raw_readw __raw_readw
83static inline u16 __raw_readw(const volatile void __iomem *addr)
84{
85 return *(const volatile u16 __force *)addr;
86}
87#endif
88
89#ifndef __raw_readl
90#define __raw_readl __raw_readl
91static inline u32 __raw_readl(const volatile void __iomem *addr)
92{
93 return *(const volatile u32 __force *)addr;
94}
95#endif
96
97#ifdef CONFIG_64BIT
98#ifndef __raw_readq
99#define __raw_readq __raw_readq
100static inline u64 __raw_readq(const volatile void __iomem *addr)
101{
102 return *(const volatile u64 __force *)addr;
103}
104#endif
105#endif /* CONFIG_64BIT */
106
107#ifndef __raw_writeb
108#define __raw_writeb __raw_writeb
109static inline void __raw_writeb(u8 value, volatile void __iomem *addr)
110{
111 *(volatile u8 __force *)addr = value;
112}
113#endif
114
115#ifndef __raw_writew
116#define __raw_writew __raw_writew
117static inline void __raw_writew(u16 value, volatile void __iomem *addr)
118{
119 *(volatile u16 __force *)addr = value;
120}
121#endif
122
123#ifndef __raw_writel
124#define __raw_writel __raw_writel
125static inline void __raw_writel(u32 value, volatile void __iomem *addr)
126{
127 *(volatile u32 __force *)addr = value;
128}
129#endif
130
131#ifdef CONFIG_64BIT
132#ifndef __raw_writeq
133#define __raw_writeq __raw_writeq
134static inline void __raw_writeq(u64 value, volatile void __iomem *addr)
135{
136 *(volatile u64 __force *)addr = value;
137}
138#endif
139#endif /* CONFIG_64BIT */
140
141/*
142 * {read,write}{b,w,l,q}() access little endian memory and return result in
143 * native endianness.
144 */
145
146#ifndef readb
147#define readb readb
148static inline u8 readb(const volatile void __iomem *addr)
149{
150 u8 val;
151
152 __io_br();
153 val = __raw_readb(addr);
154 __io_ar(val);
155 return val;
156}
157#endif
158
159#ifndef readw
160#define readw readw
161static inline u16 readw(const volatile void __iomem *addr)
162{
163 u16 val;
164
165 __io_br();
166 val = __le16_to_cpu((__le16 __force)__raw_readw(addr));
167 __io_ar(val);
168 return val;
169}
170#endif
171
172#ifndef readl
173#define readl readl
174static inline u32 readl(const volatile void __iomem *addr)
175{
176 u32 val;
177
178 __io_br();
179 val = __le32_to_cpu((__le32 __force)__raw_readl(addr));
180 __io_ar(val);
181 return val;
182}
183#endif
184
185#ifdef CONFIG_64BIT
186#ifndef readq
187#define readq readq
188static inline u64 readq(const volatile void __iomem *addr)
189{
190 u64 val;
191
192 __io_br();
193 val = __le64_to_cpu(__raw_readq(addr));
194 __io_ar(val);
195 return val;
196}
197#endif
198#endif /* CONFIG_64BIT */
199
200#ifndef writeb
201#define writeb writeb
202static inline void writeb(u8 value, volatile void __iomem *addr)
203{
204 __io_bw();
205 __raw_writeb(value, addr);
206 __io_aw();
207}
208#endif
209
210#ifndef writew
211#define writew writew
212static inline void writew(u16 value, volatile void __iomem *addr)
213{
214 __io_bw();
215 __raw_writew((u16 __force)cpu_to_le16(value), addr);
216 __io_aw();
217}
218#endif
219
220#ifndef writel
221#define writel writel
222static inline void writel(u32 value, volatile void __iomem *addr)
223{
224 __io_bw();
225 __raw_writel((u32 __force)__cpu_to_le32(value), addr);
226 __io_aw();
227}
228#endif
229
230#ifdef CONFIG_64BIT
231#ifndef writeq
232#define writeq writeq
233static inline void writeq(u64 value, volatile void __iomem *addr)
234{
235 __io_bw();
236 __raw_writeq(__cpu_to_le64(value), addr);
237 __io_aw();
238}
239#endif
240#endif /* CONFIG_64BIT */
241
242/*
243 * {read,write}{b,w,l,q}_relaxed() are like the regular version, but
244 * are not guaranteed to provide ordering against spinlocks or memory
245 * accesses.
246 */
247#ifndef readb_relaxed
248#define readb_relaxed readb_relaxed
249static inline u8 readb_relaxed(const volatile void __iomem *addr)
250{
251 return __raw_readb(addr);
252}
253#endif
254
255#ifndef readw_relaxed
256#define readw_relaxed readw_relaxed
257static inline u16 readw_relaxed(const volatile void __iomem *addr)
258{
259 return __le16_to_cpu(__raw_readw(addr));
260}
261#endif
262
263#ifndef readl_relaxed
264#define readl_relaxed readl_relaxed
265static inline u32 readl_relaxed(const volatile void __iomem *addr)
266{
267 return __le32_to_cpu(__raw_readl(addr));
268}
269#endif
270
271#if defined(readq) && !defined(readq_relaxed)
272#define readq_relaxed readq_relaxed
273static inline u64 readq_relaxed(const volatile void __iomem *addr)
274{
275 return __le64_to_cpu(__raw_readq(addr));
276}
277#endif
278
279#ifndef writeb_relaxed
280#define writeb_relaxed writeb_relaxed
281static inline void writeb_relaxed(u8 value, volatile void __iomem *addr)
282{
283 __raw_writeb(value, addr);
284}
285#endif
286
287#ifndef writew_relaxed
288#define writew_relaxed writew_relaxed
289static inline void writew_relaxed(u16 value, volatile void __iomem *addr)
290{
291 __raw_writew(cpu_to_le16(value), addr);
292}
293#endif
294
295#ifndef writel_relaxed
296#define writel_relaxed writel_relaxed
297static inline void writel_relaxed(u32 value, volatile void __iomem *addr)
298{
299 __raw_writel(__cpu_to_le32(value), addr);
300}
301#endif
302
303#if defined(writeq) && !defined(writeq_relaxed)
304#define writeq_relaxed writeq_relaxed
305static inline void writeq_relaxed(u64 value, volatile void __iomem *addr)
306{
307 __raw_writeq(__cpu_to_le64(value), addr);
308}
309#endif
310
311/*
312 * {read,write}s{b,w,l,q}() repeatedly access the same memory address in
313 * native endianness in 8-, 16-, 32- or 64-bit chunks (@count times).
314 */
315#ifndef readsb
316#define readsb readsb
317static inline void readsb(const volatile void __iomem *addr, void *buffer,
318 unsigned int count)
319{
320 if (count) {
321 u8 *buf = buffer;
322
323 do {
324 u8 x = __raw_readb(addr);
325 *buf++ = x;
326 } while (--count);
327 }
328}
329#endif
330
331#ifndef readsw
332#define readsw readsw
333static inline void readsw(const volatile void __iomem *addr, void *buffer,
334 unsigned int count)
335{
336 if (count) {
337 u16 *buf = buffer;
338
339 do {
340 u16 x = __raw_readw(addr);
341 *buf++ = x;
342 } while (--count);
343 }
344}
345#endif
346
347#ifndef readsl
348#define readsl readsl
349static inline void readsl(const volatile void __iomem *addr, void *buffer,
350 unsigned int count)
351{
352 if (count) {
353 u32 *buf = buffer;
354
355 do {
356 u32 x = __raw_readl(addr);
357 *buf++ = x;
358 } while (--count);
359 }
360}
361#endif
362
363#ifdef CONFIG_64BIT
364#ifndef readsq
365#define readsq readsq
366static inline void readsq(const volatile void __iomem *addr, void *buffer,
367 unsigned int count)
368{
369 if (count) {
370 u64 *buf = buffer;
371
372 do {
373 u64 x = __raw_readq(addr);
374 *buf++ = x;
375 } while (--count);
376 }
377}
378#endif
379#endif /* CONFIG_64BIT */
380
381#ifndef writesb
382#define writesb writesb
383static inline void writesb(volatile void __iomem *addr, const void *buffer,
384 unsigned int count)
385{
386 if (count) {
387 const u8 *buf = buffer;
388
389 do {
390 __raw_writeb(*buf++, addr);
391 } while (--count);
392 }
393}
394#endif
395
396#ifndef writesw
397#define writesw writesw
398static inline void writesw(volatile void __iomem *addr, const void *buffer,
399 unsigned int count)
400{
401 if (count) {
402 const u16 *buf = buffer;
403
404 do {
405 __raw_writew(*buf++, addr);
406 } while (--count);
407 }
408}
409#endif
410
411#ifndef writesl
412#define writesl writesl
413static inline void writesl(volatile void __iomem *addr, const void *buffer,
414 unsigned int count)
415{
416 if (count) {
417 const u32 *buf = buffer;
418
419 do {
420 __raw_writel(*buf++, addr);
421 } while (--count);
422 }
423}
424#endif
425
426#ifdef CONFIG_64BIT
427#ifndef writesq
428#define writesq writesq
429static inline void writesq(volatile void __iomem *addr, const void *buffer,
430 unsigned int count)
431{
432 if (count) {
433 const u64 *buf = buffer;
434
435 do {
436 __raw_writeq(*buf++, addr);
437 } while (--count);
438 }
439}
440#endif
441#endif /* CONFIG_64BIT */
442
443#ifndef PCI_IOBASE
444#define PCI_IOBASE ((void __iomem *)0)
445#endif
446
447#ifndef IO_SPACE_LIMIT
448#define IO_SPACE_LIMIT 0xffff
449#endif
450
451/*
452 * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
453 * implemented on hardware that needs an additional delay for I/O accesses to
454 * take effect.
455 */
456
457#if !defined(inb) && !defined(_inb)
458#define _inb _inb
459static inline u8 _inb(unsigned long addr)
460{
461 u8 val;
462
463 __io_pbr();
464 val = __raw_readb(PCI_IOBASE + addr);
465 __io_par(val);
466 return val;
467}
468#endif
469
470#if !defined(inw) && !defined(_inw)
471#define _inw _inw
472static inline u16 _inw(unsigned long addr)
473{
474 u16 val;
475
476 __io_pbr();
477 val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
478 __io_par(val);
479 return val;
480}
481#endif
482
483#if !defined(inl) && !defined(_inl)
484#define _inl _inl
485static inline u32 _inl(unsigned long addr)
486{
487 u32 val;
488
489 __io_pbr();
490 val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
491 __io_par(val);
492 return val;
493}
494#endif
495
496#if !defined(outb) && !defined(_outb)
497#define _outb _outb
498static inline void _outb(u8 value, unsigned long addr)
499{
500 __io_pbw();
501 __raw_writeb(value, PCI_IOBASE + addr);
502 __io_paw();
503}
504#endif
505
506#if !defined(outw) && !defined(_outw)
507#define _outw _outw
508static inline void _outw(u16 value, unsigned long addr)
509{
510 __io_pbw();
511 __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
512 __io_paw();
513}
514#endif
515
516#if !defined(outl) && !defined(_outl)
517#define _outl _outl
518static inline void _outl(u32 value, unsigned long addr)
519{
520 __io_pbw();
521 __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
522 __io_paw();
523}
524#endif
525
526#include <linux/logic_pio.h>
527
528#ifndef inb
529#define inb _inb
530#endif
531
532#ifndef inw
533#define inw _inw
534#endif
535
536#ifndef inl
537#define inl _inl
538#endif
539
540#ifndef outb
541#define outb _outb
542#endif
543
544#ifndef outw
545#define outw _outw
546#endif
547
548#ifndef outl
549#define outl _outl
550#endif
551
552#ifndef inb_p
553#define inb_p inb_p
554static inline u8 inb_p(unsigned long addr)
555{
556 return inb(addr);
557}
558#endif
559
560#ifndef inw_p
561#define inw_p inw_p
562static inline u16 inw_p(unsigned long addr)
563{
564 return inw(addr);
565}
566#endif
567
568#ifndef inl_p
569#define inl_p inl_p
570static inline u32 inl_p(unsigned long addr)
571{
572 return inl(addr);
573}
574#endif
575
576#ifndef outb_p
577#define outb_p outb_p
578static inline void outb_p(u8 value, unsigned long addr)
579{
580 outb(value, addr);
581}
582#endif
583
584#ifndef outw_p
585#define outw_p outw_p
586static inline void outw_p(u16 value, unsigned long addr)
587{
588 outw(value, addr);
589}
590#endif
591
592#ifndef outl_p
593#define outl_p outl_p
594static inline void outl_p(u32 value, unsigned long addr)
595{
596 outl(value, addr);
597}
598#endif
599
600/*
601 * {in,out}s{b,w,l}{,_p}() are variants of the above that repeatedly access a
602 * single I/O port multiple times.
603 */
604
605#ifndef insb
606#define insb insb
607static inline void insb(unsigned long addr, void *buffer, unsigned int count)
608{
609 readsb(PCI_IOBASE + addr, buffer, count);
610}
611#endif
612
613#ifndef insw
614#define insw insw
615static inline void insw(unsigned long addr, void *buffer, unsigned int count)
616{
617 readsw(PCI_IOBASE + addr, buffer, count);
618}
619#endif
620
621#ifndef insl
622#define insl insl
623static inline void insl(unsigned long addr, void *buffer, unsigned int count)
624{
625 readsl(PCI_IOBASE + addr, buffer, count);
626}
627#endif
628
629#ifndef outsb
630#define outsb outsb
631static inline void outsb(unsigned long addr, const void *buffer,
632 unsigned int count)
633{
634 writesb(PCI_IOBASE + addr, buffer, count);
635}
636#endif
637
638#ifndef outsw
639#define outsw outsw
640static inline void outsw(unsigned long addr, const void *buffer,
641 unsigned int count)
642{
643 writesw(PCI_IOBASE + addr, buffer, count);
644}
645#endif
646
647#ifndef outsl
648#define outsl outsl
649static inline void outsl(unsigned long addr, const void *buffer,
650 unsigned int count)
651{
652 writesl(PCI_IOBASE + addr, buffer, count);
653}
654#endif
655
656#ifndef insb_p
657#define insb_p insb_p
658static inline void insb_p(unsigned long addr, void *buffer, unsigned int count)
659{
660 insb(addr, buffer, count);
661}
662#endif
663
664#ifndef insw_p
665#define insw_p insw_p
666static inline void insw_p(unsigned long addr, void *buffer, unsigned int count)
667{
668 insw(addr, buffer, count);
669}
670#endif
671
672#ifndef insl_p
673#define insl_p insl_p
674static inline void insl_p(unsigned long addr, void *buffer, unsigned int count)
675{
676 insl(addr, buffer, count);
677}
678#endif
679
680#ifndef outsb_p
681#define outsb_p outsb_p
682static inline void outsb_p(unsigned long addr, const void *buffer,
683 unsigned int count)
684{
685 outsb(addr, buffer, count);
686}
687#endif
688
689#ifndef outsw_p
690#define outsw_p outsw_p
691static inline void outsw_p(unsigned long addr, const void *buffer,
692 unsigned int count)
693{
694 outsw(addr, buffer, count);
695}
696#endif
697
698#ifndef outsl_p
699#define outsl_p outsl_p
700static inline void outsl_p(unsigned long addr, const void *buffer,
701 unsigned int count)
702{
703 outsl(addr, buffer, count);
704}
705#endif
706
707#ifndef CONFIG_GENERIC_IOMAP
708#ifndef ioread8
709#define ioread8 ioread8
710static inline u8 ioread8(const volatile void __iomem *addr)
711{
712 return readb(addr);
713}
714#endif
715
716#ifndef ioread16
717#define ioread16 ioread16
718static inline u16 ioread16(const volatile void __iomem *addr)
719{
720 return readw(addr);
721}
722#endif
723
724#ifndef ioread32
725#define ioread32 ioread32
726static inline u32 ioread32(const volatile void __iomem *addr)
727{
728 return readl(addr);
729}
730#endif
731
732#ifdef CONFIG_64BIT
733#ifndef ioread64
734#define ioread64 ioread64
735static inline u64 ioread64(const volatile void __iomem *addr)
736{
737 return readq(addr);
738}
739#endif
740#endif /* CONFIG_64BIT */
741
742#ifndef iowrite8
743#define iowrite8 iowrite8
744static inline void iowrite8(u8 value, volatile void __iomem *addr)
745{
746 writeb(value, addr);
747}
748#endif
749
750#ifndef iowrite16
751#define iowrite16 iowrite16
752static inline void iowrite16(u16 value, volatile void __iomem *addr)
753{
754 writew(value, addr);
755}
756#endif
757
758#ifndef iowrite32
759#define iowrite32 iowrite32
760static inline void iowrite32(u32 value, volatile void __iomem *addr)
761{
762 writel(value, addr);
763}
764#endif
765
766#ifdef CONFIG_64BIT
767#ifndef iowrite64
768#define iowrite64 iowrite64
769static inline void iowrite64(u64 value, volatile void __iomem *addr)
770{
771 writeq(value, addr);
772}
773#endif
774#endif /* CONFIG_64BIT */
775
776#ifndef ioread16be
777#define ioread16be ioread16be
778static inline u16 ioread16be(const volatile void __iomem *addr)
779{
780 return swab16(readw(addr));
781}
782#endif
783
784#ifndef ioread32be
785#define ioread32be ioread32be
786static inline u32 ioread32be(const volatile void __iomem *addr)
787{
788 return swab32(readl(addr));
789}
790#endif
791
792#ifdef CONFIG_64BIT
793#ifndef ioread64be
794#define ioread64be ioread64be
795static inline u64 ioread64be(const volatile void __iomem *addr)
796{
797 return swab64(readq(addr));
798}
799#endif
800#endif /* CONFIG_64BIT */
801
802#ifndef iowrite16be
803#define iowrite16be iowrite16be
804static inline void iowrite16be(u16 value, void volatile __iomem *addr)
805{
806 writew(swab16(value), addr);
807}
808#endif
809
810#ifndef iowrite32be
811#define iowrite32be iowrite32be
812static inline void iowrite32be(u32 value, volatile void __iomem *addr)
813{
814 writel(swab32(value), addr);
815}
816#endif
817
818#ifdef CONFIG_64BIT
819#ifndef iowrite64be
820#define iowrite64be iowrite64be
821static inline void iowrite64be(u64 value, volatile void __iomem *addr)
822{
823 writeq(swab64(value), addr);
824}
825#endif
826#endif /* CONFIG_64BIT */
827
828#ifndef ioread8_rep
829#define ioread8_rep ioread8_rep
830static inline void ioread8_rep(const volatile void __iomem *addr, void *buffer,
831 unsigned int count)
832{
833 readsb(addr, buffer, count);
834}
835#endif
836
837#ifndef ioread16_rep
838#define ioread16_rep ioread16_rep
839static inline void ioread16_rep(const volatile void __iomem *addr,
840 void *buffer, unsigned int count)
841{
842 readsw(addr, buffer, count);
843}
844#endif
845
846#ifndef ioread32_rep
847#define ioread32_rep ioread32_rep
848static inline void ioread32_rep(const volatile void __iomem *addr,
849 void *buffer, unsigned int count)
850{
851 readsl(addr, buffer, count);
852}
853#endif
854
855#ifdef CONFIG_64BIT
856#ifndef ioread64_rep
857#define ioread64_rep ioread64_rep
858static inline void ioread64_rep(const volatile void __iomem *addr,
859 void *buffer, unsigned int count)
860{
861 readsq(addr, buffer, count);
862}
863#endif
864#endif /* CONFIG_64BIT */
865
866#ifndef iowrite8_rep
867#define iowrite8_rep iowrite8_rep
868static inline void iowrite8_rep(volatile void __iomem *addr,
869 const void *buffer,
870 unsigned int count)
871{
872 writesb(addr, buffer, count);
873}
874#endif
875
876#ifndef iowrite16_rep
877#define iowrite16_rep iowrite16_rep
878static inline void iowrite16_rep(volatile void __iomem *addr,
879 const void *buffer,
880 unsigned int count)
881{
882 writesw(addr, buffer, count);
883}
884#endif
885
886#ifndef iowrite32_rep
887#define iowrite32_rep iowrite32_rep
888static inline void iowrite32_rep(volatile void __iomem *addr,
889 const void *buffer,
890 unsigned int count)
891{
892 writesl(addr, buffer, count);
893}
894#endif
895
896#ifdef CONFIG_64BIT
897#ifndef iowrite64_rep
898#define iowrite64_rep iowrite64_rep
899static inline void iowrite64_rep(volatile void __iomem *addr,
900 const void *buffer,
901 unsigned int count)
902{
903 writesq(addr, buffer, count);
904}
905#endif
906#endif /* CONFIG_64BIT */
907#endif /* CONFIG_GENERIC_IOMAP */
908
909#ifdef __KERNEL__
910
911#include <linux/vmalloc.h>
912#define __io_virt(x) ((void __force *)(x))
913
914/*
915 * Change virtual addresses to physical addresses and vv.
916 * These are pretty trivial
917 */
918#ifndef virt_to_phys
919#define virt_to_phys virt_to_phys
920static inline unsigned long virt_to_phys(volatile void *address)
921{
922 return __pa((unsigned long)address);
923}
924#endif
925
926#ifndef phys_to_virt
927#define phys_to_virt phys_to_virt
928static inline void *phys_to_virt(unsigned long address)
929{
930 return __va(address);
931}
932#endif
933
934/**
935 * DOC: ioremap() and ioremap_*() variants
936 *
937 * Architectures with an MMU are expected to provide ioremap() and iounmap()
938 * themselves or rely on GENERIC_IOREMAP. For NOMMU architectures we provide
939 * a default nop-op implementation that expect that the physical address used
940 * for MMIO are already marked as uncached, and can be used as kernel virtual
941 * addresses.
942 *
943 * ioremap_wc() and ioremap_wt() can provide more relaxed caching attributes
944 * for specific drivers if the architecture choses to implement them. If they
945 * are not implemented we fall back to plain ioremap. Conversely, ioremap_np()
946 * can provide stricter non-posted write semantics if the architecture
947 * implements them.
948 */
949#ifndef CONFIG_MMU
950#ifndef ioremap
951#define ioremap ioremap
952static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
953{
954 return (void __iomem *)(unsigned long)offset;
955}
956#endif
957
958#ifndef iounmap
959#define iounmap iounmap
960static inline void iounmap(void __iomem *addr)
961{
962}
963#endif
964#elif defined(CONFIG_GENERIC_IOREMAP)
965#include <linux/pgtable.h>
966
967void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot);
968void iounmap(volatile void __iomem *addr);
969
970static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
971{
972 /* _PAGE_IOREMAP needs to be supplied by the architecture */
973 return ioremap_prot(addr, size, _PAGE_IOREMAP);
974}
975#endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
976
977#ifndef ioremap_wc
978#define ioremap_wc ioremap
979#endif
980
981#ifndef ioremap_wt
982#define ioremap_wt ioremap
983#endif
984
985/*
986 * ioremap_uc is special in that we do require an explicit architecture
987 * implementation. In general you do not want to use this function in a
988 * driver and use plain ioremap, which is uncached by default. Similarly
989 * architectures should not implement it unless they have a very good
990 * reason.
991 */
992#ifndef ioremap_uc
993#define ioremap_uc ioremap_uc
994static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
995{
996 return NULL;
997}
998#endif
999
1000/*
1001 * ioremap_np needs an explicit architecture implementation, as it
1002 * requests stronger semantics than regular ioremap(). Portable drivers
1003 * should instead use one of the higher-level abstractions, like
1004 * devm_ioremap_resource(), to choose the correct variant for any given
1005 * device and bus. Portable drivers with a good reason to want non-posted
1006 * write semantics should always provide an ioremap() fallback in case
1007 * ioremap_np() is not available.
1008 */
1009#ifndef ioremap_np
1010#define ioremap_np ioremap_np
1011static inline void __iomem *ioremap_np(phys_addr_t offset, size_t size)
1012{
1013 return NULL;
1014}
1015#endif
1016
1017#ifdef CONFIG_HAS_IOPORT_MAP
1018#ifndef CONFIG_GENERIC_IOMAP
1019#ifndef ioport_map
1020#define ioport_map ioport_map
1021static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
1022{
1023 port &= IO_SPACE_LIMIT;
1024 return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
1025}
1026#define __pci_ioport_unmap __pci_ioport_unmap
1027static inline void __pci_ioport_unmap(void __iomem *p)
1028{
1029 uintptr_t start = (uintptr_t) PCI_IOBASE;
1030 uintptr_t addr = (uintptr_t) p;
1031
1032 if (addr >= start && addr < start + IO_SPACE_LIMIT)
1033 return;
1034 iounmap(p);
1035}
1036#endif
1037
1038#ifndef ioport_unmap
1039#define ioport_unmap ioport_unmap
1040static inline void ioport_unmap(void __iomem *p)
1041{
1042}
1043#endif
1044#else /* CONFIG_GENERIC_IOMAP */
1045extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
1046extern void ioport_unmap(void __iomem *p);
1047#endif /* CONFIG_GENERIC_IOMAP */
1048#endif /* CONFIG_HAS_IOPORT_MAP */
1049
1050#ifndef CONFIG_GENERIC_IOMAP
1051struct pci_dev;
1052extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
1053
1054#ifndef __pci_ioport_unmap
1055static inline void __pci_ioport_unmap(void __iomem *p) {}
1056#endif
1057
1058#ifndef pci_iounmap
1059#define pci_iounmap pci_iounmap
1060static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
1061{
1062 __pci_ioport_unmap(p);
1063}
1064#endif
1065#endif /* CONFIG_GENERIC_IOMAP */
1066
1067#ifndef xlate_dev_mem_ptr
1068#define xlate_dev_mem_ptr xlate_dev_mem_ptr
1069static inline void *xlate_dev_mem_ptr(phys_addr_t addr)
1070{
1071 return __va(addr);
1072}
1073#endif
1074
1075#ifndef unxlate_dev_mem_ptr
1076#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
1077static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
1078{
1079}
1080#endif
1081
1082#ifdef CONFIG_VIRT_TO_BUS
1083#ifndef virt_to_bus
1084static inline unsigned long virt_to_bus(void *address)
1085{
1086 return (unsigned long)address;
1087}
1088
1089static inline void *bus_to_virt(unsigned long address)
1090{
1091 return (void *)address;
1092}
1093#endif
1094#endif
1095
1096#ifndef memset_io
1097#define memset_io memset_io
1098/**
1099 * memset_io Set a range of I/O memory to a constant value
1100 * @addr: The beginning of the I/O-memory range to set
1101 * @val: The value to set the memory to
1102 * @count: The number of bytes to set
1103 *
1104 * Set a range of I/O memory to a given value.
1105 */
1106static inline void memset_io(volatile void __iomem *addr, int value,
1107 size_t size)
1108{
1109 memset(__io_virt(addr), value, size);
1110}
1111#endif
1112
1113#ifndef memcpy_fromio
1114#define memcpy_fromio memcpy_fromio
1115/**
1116 * memcpy_fromio Copy a block of data from I/O memory
1117 * @dst: The (RAM) destination for the copy
1118 * @src: The (I/O memory) source for the data
1119 * @count: The number of bytes to copy
1120 *
1121 * Copy a block of data from I/O memory.
1122 */
1123static inline void memcpy_fromio(void *buffer,
1124 const volatile void __iomem *addr,
1125 size_t size)
1126{
1127 memcpy(buffer, __io_virt(addr), size);
1128}
1129#endif
1130
1131#ifndef memcpy_toio
1132#define memcpy_toio memcpy_toio
1133/**
1134 * memcpy_toio Copy a block of data into I/O memory
1135 * @dst: The (I/O memory) destination for the copy
1136 * @src: The (RAM) source for the data
1137 * @count: The number of bytes to copy
1138 *
1139 * Copy a block of data to I/O memory.
1140 */
1141static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
1142 size_t size)
1143{
1144 memcpy(__io_virt(addr), buffer, size);
1145}
1146#endif
1147
1148#ifndef CONFIG_GENERIC_DEVMEM_IS_ALLOWED
1149extern int devmem_is_allowed(unsigned long pfn);
1150#endif
1151
1152#endif /* __KERNEL__ */
1153
1154#endif /* __ASM_GENERIC_IO_H */