Loading...
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#include <linux/instruction_pointer.h>
14
15#ifdef CONFIG_GENERIC_IOMAP
16#include <asm-generic/iomap.h>
17#endif
18
19#include <asm/mmiowb.h>
20#include <asm-generic/pci_iomap.h>
21
22#ifndef __io_br
23#define __io_br() barrier()
24#endif
25
26/* prevent prefetching of coherent DMA data ahead of a dma-complete */
27#ifndef __io_ar
28#ifdef rmb
29#define __io_ar(v) rmb()
30#else
31#define __io_ar(v) barrier()
32#endif
33#endif
34
35/* flush writes to coherent DMA data before possibly triggering a DMA read */
36#ifndef __io_bw
37#ifdef wmb
38#define __io_bw() wmb()
39#else
40#define __io_bw() barrier()
41#endif
42#endif
43
44/* serialize device access against a spin_unlock, usually handled there. */
45#ifndef __io_aw
46#define __io_aw() mmiowb_set_pending()
47#endif
48
49#ifndef __io_pbw
50#define __io_pbw() __io_bw()
51#endif
52
53#ifndef __io_paw
54#define __io_paw() __io_aw()
55#endif
56
57#ifndef __io_pbr
58#define __io_pbr() __io_br()
59#endif
60
61#ifndef __io_par
62#define __io_par(v) __io_ar(v)
63#endif
64
65/*
66 * "__DISABLE_TRACE_MMIO__" flag can be used to disable MMIO tracing for
67 * specific kernel drivers in case of excessive/unwanted logging.
68 *
69 * Usage: Add a #define flag at the beginning of the driver file.
70 * Ex: #define __DISABLE_TRACE_MMIO__
71 * #include <...>
72 * ...
73 */
74#if IS_ENABLED(CONFIG_TRACE_MMIO_ACCESS) && !(defined(__DISABLE_TRACE_MMIO__))
75#include <linux/tracepoint-defs.h>
76
77DECLARE_TRACEPOINT(rwmmio_write);
78DECLARE_TRACEPOINT(rwmmio_post_write);
79DECLARE_TRACEPOINT(rwmmio_read);
80DECLARE_TRACEPOINT(rwmmio_post_read);
81
82void log_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
83 unsigned long caller_addr, unsigned long caller_addr0);
84void log_post_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
85 unsigned long caller_addr, unsigned long caller_addr0);
86void log_read_mmio(u8 width, const volatile void __iomem *addr,
87 unsigned long caller_addr, unsigned long caller_addr0);
88void log_post_read_mmio(u64 val, u8 width, const volatile void __iomem *addr,
89 unsigned long caller_addr, unsigned long caller_addr0);
90
91#else
92
93static inline void log_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
94 unsigned long caller_addr, unsigned long caller_addr0) {}
95static inline void log_post_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
96 unsigned long caller_addr, unsigned long caller_addr0) {}
97static inline void log_read_mmio(u8 width, const volatile void __iomem *addr,
98 unsigned long caller_addr, unsigned long caller_addr0) {}
99static inline void log_post_read_mmio(u64 val, u8 width, const volatile void __iomem *addr,
100 unsigned long caller_addr, unsigned long caller_addr0) {}
101
102#endif /* CONFIG_TRACE_MMIO_ACCESS */
103
104/*
105 * __raw_{read,write}{b,w,l,q}() access memory in native endianness.
106 *
107 * On some architectures memory mapped IO needs to be accessed differently.
108 * On the simple architectures, we just read/write the memory location
109 * directly.
110 */
111
112#ifndef __raw_readb
113#define __raw_readb __raw_readb
114static inline u8 __raw_readb(const volatile void __iomem *addr)
115{
116 return *(const volatile u8 __force *)addr;
117}
118#endif
119
120#ifndef __raw_readw
121#define __raw_readw __raw_readw
122static inline u16 __raw_readw(const volatile void __iomem *addr)
123{
124 return *(const volatile u16 __force *)addr;
125}
126#endif
127
128#ifndef __raw_readl
129#define __raw_readl __raw_readl
130static inline u32 __raw_readl(const volatile void __iomem *addr)
131{
132 return *(const volatile u32 __force *)addr;
133}
134#endif
135
136#ifdef CONFIG_64BIT
137#ifndef __raw_readq
138#define __raw_readq __raw_readq
139static inline u64 __raw_readq(const volatile void __iomem *addr)
140{
141 return *(const volatile u64 __force *)addr;
142}
143#endif
144#endif /* CONFIG_64BIT */
145
146#ifndef __raw_writeb
147#define __raw_writeb __raw_writeb
148static inline void __raw_writeb(u8 value, volatile void __iomem *addr)
149{
150 *(volatile u8 __force *)addr = value;
151}
152#endif
153
154#ifndef __raw_writew
155#define __raw_writew __raw_writew
156static inline void __raw_writew(u16 value, volatile void __iomem *addr)
157{
158 *(volatile u16 __force *)addr = value;
159}
160#endif
161
162#ifndef __raw_writel
163#define __raw_writel __raw_writel
164static inline void __raw_writel(u32 value, volatile void __iomem *addr)
165{
166 *(volatile u32 __force *)addr = value;
167}
168#endif
169
170#ifdef CONFIG_64BIT
171#ifndef __raw_writeq
172#define __raw_writeq __raw_writeq
173static inline void __raw_writeq(u64 value, volatile void __iomem *addr)
174{
175 *(volatile u64 __force *)addr = value;
176}
177#endif
178#endif /* CONFIG_64BIT */
179
180/*
181 * {read,write}{b,w,l,q}() access little endian memory and return result in
182 * native endianness.
183 */
184
185#ifndef readb
186#define readb readb
187static inline u8 readb(const volatile void __iomem *addr)
188{
189 u8 val;
190
191 log_read_mmio(8, addr, _THIS_IP_, _RET_IP_);
192 __io_br();
193 val = __raw_readb(addr);
194 __io_ar(val);
195 log_post_read_mmio(val, 8, addr, _THIS_IP_, _RET_IP_);
196 return val;
197}
198#endif
199
200#ifndef readw
201#define readw readw
202static inline u16 readw(const volatile void __iomem *addr)
203{
204 u16 val;
205
206 log_read_mmio(16, addr, _THIS_IP_, _RET_IP_);
207 __io_br();
208 val = __le16_to_cpu((__le16 __force)__raw_readw(addr));
209 __io_ar(val);
210 log_post_read_mmio(val, 16, addr, _THIS_IP_, _RET_IP_);
211 return val;
212}
213#endif
214
215#ifndef readl
216#define readl readl
217static inline u32 readl(const volatile void __iomem *addr)
218{
219 u32 val;
220
221 log_read_mmio(32, addr, _THIS_IP_, _RET_IP_);
222 __io_br();
223 val = __le32_to_cpu((__le32 __force)__raw_readl(addr));
224 __io_ar(val);
225 log_post_read_mmio(val, 32, addr, _THIS_IP_, _RET_IP_);
226 return val;
227}
228#endif
229
230#ifdef CONFIG_64BIT
231#ifndef readq
232#define readq readq
233static inline u64 readq(const volatile void __iomem *addr)
234{
235 u64 val;
236
237 log_read_mmio(64, addr, _THIS_IP_, _RET_IP_);
238 __io_br();
239 val = __le64_to_cpu((__le64 __force)__raw_readq(addr));
240 __io_ar(val);
241 log_post_read_mmio(val, 64, addr, _THIS_IP_, _RET_IP_);
242 return val;
243}
244#endif
245#endif /* CONFIG_64BIT */
246
247#ifndef writeb
248#define writeb writeb
249static inline void writeb(u8 value, volatile void __iomem *addr)
250{
251 log_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
252 __io_bw();
253 __raw_writeb(value, addr);
254 __io_aw();
255 log_post_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
256}
257#endif
258
259#ifndef writew
260#define writew writew
261static inline void writew(u16 value, volatile void __iomem *addr)
262{
263 log_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
264 __io_bw();
265 __raw_writew((u16 __force)cpu_to_le16(value), addr);
266 __io_aw();
267 log_post_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
268}
269#endif
270
271#ifndef writel
272#define writel writel
273static inline void writel(u32 value, volatile void __iomem *addr)
274{
275 log_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
276 __io_bw();
277 __raw_writel((u32 __force)__cpu_to_le32(value), addr);
278 __io_aw();
279 log_post_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
280}
281#endif
282
283#ifdef CONFIG_64BIT
284#ifndef writeq
285#define writeq writeq
286static inline void writeq(u64 value, volatile void __iomem *addr)
287{
288 log_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
289 __io_bw();
290 __raw_writeq((u64 __force)__cpu_to_le64(value), addr);
291 __io_aw();
292 log_post_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
293}
294#endif
295#endif /* CONFIG_64BIT */
296
297/*
298 * {read,write}{b,w,l,q}_relaxed() are like the regular version, but
299 * are not guaranteed to provide ordering against spinlocks or memory
300 * accesses.
301 */
302#ifndef readb_relaxed
303#define readb_relaxed readb_relaxed
304static inline u8 readb_relaxed(const volatile void __iomem *addr)
305{
306 u8 val;
307
308 log_read_mmio(8, addr, _THIS_IP_, _RET_IP_);
309 val = __raw_readb(addr);
310 log_post_read_mmio(val, 8, addr, _THIS_IP_, _RET_IP_);
311 return val;
312}
313#endif
314
315#ifndef readw_relaxed
316#define readw_relaxed readw_relaxed
317static inline u16 readw_relaxed(const volatile void __iomem *addr)
318{
319 u16 val;
320
321 log_read_mmio(16, addr, _THIS_IP_, _RET_IP_);
322 val = __le16_to_cpu((__le16 __force)__raw_readw(addr));
323 log_post_read_mmio(val, 16, addr, _THIS_IP_, _RET_IP_);
324 return val;
325}
326#endif
327
328#ifndef readl_relaxed
329#define readl_relaxed readl_relaxed
330static inline u32 readl_relaxed(const volatile void __iomem *addr)
331{
332 u32 val;
333
334 log_read_mmio(32, addr, _THIS_IP_, _RET_IP_);
335 val = __le32_to_cpu((__le32 __force)__raw_readl(addr));
336 log_post_read_mmio(val, 32, addr, _THIS_IP_, _RET_IP_);
337 return val;
338}
339#endif
340
341#if defined(readq) && !defined(readq_relaxed)
342#define readq_relaxed readq_relaxed
343static inline u64 readq_relaxed(const volatile void __iomem *addr)
344{
345 u64 val;
346
347 log_read_mmio(64, addr, _THIS_IP_, _RET_IP_);
348 val = __le64_to_cpu((__le64 __force)__raw_readq(addr));
349 log_post_read_mmio(val, 64, addr, _THIS_IP_, _RET_IP_);
350 return val;
351}
352#endif
353
354#ifndef writeb_relaxed
355#define writeb_relaxed writeb_relaxed
356static inline void writeb_relaxed(u8 value, volatile void __iomem *addr)
357{
358 log_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
359 __raw_writeb(value, addr);
360 log_post_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
361}
362#endif
363
364#ifndef writew_relaxed
365#define writew_relaxed writew_relaxed
366static inline void writew_relaxed(u16 value, volatile void __iomem *addr)
367{
368 log_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
369 __raw_writew((u16 __force)cpu_to_le16(value), addr);
370 log_post_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
371}
372#endif
373
374#ifndef writel_relaxed
375#define writel_relaxed writel_relaxed
376static inline void writel_relaxed(u32 value, volatile void __iomem *addr)
377{
378 log_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
379 __raw_writel((u32 __force)__cpu_to_le32(value), addr);
380 log_post_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
381}
382#endif
383
384#if defined(writeq) && !defined(writeq_relaxed)
385#define writeq_relaxed writeq_relaxed
386static inline void writeq_relaxed(u64 value, volatile void __iomem *addr)
387{
388 log_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
389 __raw_writeq((u64 __force)__cpu_to_le64(value), addr);
390 log_post_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
391}
392#endif
393
394/*
395 * {read,write}s{b,w,l,q}() repeatedly access the same memory address in
396 * native endianness in 8-, 16-, 32- or 64-bit chunks (@count times).
397 */
398#ifndef readsb
399#define readsb readsb
400static inline void readsb(const volatile void __iomem *addr, void *buffer,
401 unsigned int count)
402{
403 if (count) {
404 u8 *buf = buffer;
405
406 do {
407 u8 x = __raw_readb(addr);
408 *buf++ = x;
409 } while (--count);
410 }
411}
412#endif
413
414#ifndef readsw
415#define readsw readsw
416static inline void readsw(const volatile void __iomem *addr, void *buffer,
417 unsigned int count)
418{
419 if (count) {
420 u16 *buf = buffer;
421
422 do {
423 u16 x = __raw_readw(addr);
424 *buf++ = x;
425 } while (--count);
426 }
427}
428#endif
429
430#ifndef readsl
431#define readsl readsl
432static inline void readsl(const volatile void __iomem *addr, void *buffer,
433 unsigned int count)
434{
435 if (count) {
436 u32 *buf = buffer;
437
438 do {
439 u32 x = __raw_readl(addr);
440 *buf++ = x;
441 } while (--count);
442 }
443}
444#endif
445
446#ifdef CONFIG_64BIT
447#ifndef readsq
448#define readsq readsq
449static inline void readsq(const volatile void __iomem *addr, void *buffer,
450 unsigned int count)
451{
452 if (count) {
453 u64 *buf = buffer;
454
455 do {
456 u64 x = __raw_readq(addr);
457 *buf++ = x;
458 } while (--count);
459 }
460}
461#endif
462#endif /* CONFIG_64BIT */
463
464#ifndef writesb
465#define writesb writesb
466static inline void writesb(volatile void __iomem *addr, const void *buffer,
467 unsigned int count)
468{
469 if (count) {
470 const u8 *buf = buffer;
471
472 do {
473 __raw_writeb(*buf++, addr);
474 } while (--count);
475 }
476}
477#endif
478
479#ifndef writesw
480#define writesw writesw
481static inline void writesw(volatile void __iomem *addr, const void *buffer,
482 unsigned int count)
483{
484 if (count) {
485 const u16 *buf = buffer;
486
487 do {
488 __raw_writew(*buf++, addr);
489 } while (--count);
490 }
491}
492#endif
493
494#ifndef writesl
495#define writesl writesl
496static inline void writesl(volatile void __iomem *addr, const void *buffer,
497 unsigned int count)
498{
499 if (count) {
500 const u32 *buf = buffer;
501
502 do {
503 __raw_writel(*buf++, addr);
504 } while (--count);
505 }
506}
507#endif
508
509#ifdef CONFIG_64BIT
510#ifndef writesq
511#define writesq writesq
512static inline void writesq(volatile void __iomem *addr, const void *buffer,
513 unsigned int count)
514{
515 if (count) {
516 const u64 *buf = buffer;
517
518 do {
519 __raw_writeq(*buf++, addr);
520 } while (--count);
521 }
522}
523#endif
524#endif /* CONFIG_64BIT */
525
526#ifndef PCI_IOBASE
527#define PCI_IOBASE ((void __iomem *)0)
528#endif
529
530#ifndef IO_SPACE_LIMIT
531#define IO_SPACE_LIMIT 0xffff
532#endif
533
534/*
535 * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
536 * implemented on hardware that needs an additional delay for I/O accesses to
537 * take effect.
538 */
539
540#if !defined(inb) && !defined(_inb)
541#define _inb _inb
542static inline u8 _inb(unsigned long addr)
543{
544 u8 val;
545
546 __io_pbr();
547 val = __raw_readb(PCI_IOBASE + addr);
548 __io_par(val);
549 return val;
550}
551#endif
552
553#if !defined(inw) && !defined(_inw)
554#define _inw _inw
555static inline u16 _inw(unsigned long addr)
556{
557 u16 val;
558
559 __io_pbr();
560 val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
561 __io_par(val);
562 return val;
563}
564#endif
565
566#if !defined(inl) && !defined(_inl)
567#define _inl _inl
568static inline u32 _inl(unsigned long addr)
569{
570 u32 val;
571
572 __io_pbr();
573 val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
574 __io_par(val);
575 return val;
576}
577#endif
578
579#if !defined(outb) && !defined(_outb)
580#define _outb _outb
581static inline void _outb(u8 value, unsigned long addr)
582{
583 __io_pbw();
584 __raw_writeb(value, PCI_IOBASE + addr);
585 __io_paw();
586}
587#endif
588
589#if !defined(outw) && !defined(_outw)
590#define _outw _outw
591static inline void _outw(u16 value, unsigned long addr)
592{
593 __io_pbw();
594 __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
595 __io_paw();
596}
597#endif
598
599#if !defined(outl) && !defined(_outl)
600#define _outl _outl
601static inline void _outl(u32 value, unsigned long addr)
602{
603 __io_pbw();
604 __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
605 __io_paw();
606}
607#endif
608
609#include <linux/logic_pio.h>
610
611#ifndef inb
612#define inb _inb
613#endif
614
615#ifndef inw
616#define inw _inw
617#endif
618
619#ifndef inl
620#define inl _inl
621#endif
622
623#ifndef outb
624#define outb _outb
625#endif
626
627#ifndef outw
628#define outw _outw
629#endif
630
631#ifndef outl
632#define outl _outl
633#endif
634
635#ifndef inb_p
636#define inb_p inb_p
637static inline u8 inb_p(unsigned long addr)
638{
639 return inb(addr);
640}
641#endif
642
643#ifndef inw_p
644#define inw_p inw_p
645static inline u16 inw_p(unsigned long addr)
646{
647 return inw(addr);
648}
649#endif
650
651#ifndef inl_p
652#define inl_p inl_p
653static inline u32 inl_p(unsigned long addr)
654{
655 return inl(addr);
656}
657#endif
658
659#ifndef outb_p
660#define outb_p outb_p
661static inline void outb_p(u8 value, unsigned long addr)
662{
663 outb(value, addr);
664}
665#endif
666
667#ifndef outw_p
668#define outw_p outw_p
669static inline void outw_p(u16 value, unsigned long addr)
670{
671 outw(value, addr);
672}
673#endif
674
675#ifndef outl_p
676#define outl_p outl_p
677static inline void outl_p(u32 value, unsigned long addr)
678{
679 outl(value, addr);
680}
681#endif
682
683/*
684 * {in,out}s{b,w,l}{,_p}() are variants of the above that repeatedly access a
685 * single I/O port multiple times.
686 */
687
688#ifndef insb
689#define insb insb
690static inline void insb(unsigned long addr, void *buffer, unsigned int count)
691{
692 readsb(PCI_IOBASE + addr, buffer, count);
693}
694#endif
695
696#ifndef insw
697#define insw insw
698static inline void insw(unsigned long addr, void *buffer, unsigned int count)
699{
700 readsw(PCI_IOBASE + addr, buffer, count);
701}
702#endif
703
704#ifndef insl
705#define insl insl
706static inline void insl(unsigned long addr, void *buffer, unsigned int count)
707{
708 readsl(PCI_IOBASE + addr, buffer, count);
709}
710#endif
711
712#ifndef outsb
713#define outsb outsb
714static inline void outsb(unsigned long addr, const void *buffer,
715 unsigned int count)
716{
717 writesb(PCI_IOBASE + addr, buffer, count);
718}
719#endif
720
721#ifndef outsw
722#define outsw outsw
723static inline void outsw(unsigned long addr, const void *buffer,
724 unsigned int count)
725{
726 writesw(PCI_IOBASE + addr, buffer, count);
727}
728#endif
729
730#ifndef outsl
731#define outsl outsl
732static inline void outsl(unsigned long addr, const void *buffer,
733 unsigned int count)
734{
735 writesl(PCI_IOBASE + addr, buffer, count);
736}
737#endif
738
739#ifndef insb_p
740#define insb_p insb_p
741static inline void insb_p(unsigned long addr, void *buffer, unsigned int count)
742{
743 insb(addr, buffer, count);
744}
745#endif
746
747#ifndef insw_p
748#define insw_p insw_p
749static inline void insw_p(unsigned long addr, void *buffer, unsigned int count)
750{
751 insw(addr, buffer, count);
752}
753#endif
754
755#ifndef insl_p
756#define insl_p insl_p
757static inline void insl_p(unsigned long addr, void *buffer, unsigned int count)
758{
759 insl(addr, buffer, count);
760}
761#endif
762
763#ifndef outsb_p
764#define outsb_p outsb_p
765static inline void outsb_p(unsigned long addr, const void *buffer,
766 unsigned int count)
767{
768 outsb(addr, buffer, count);
769}
770#endif
771
772#ifndef outsw_p
773#define outsw_p outsw_p
774static inline void outsw_p(unsigned long addr, const void *buffer,
775 unsigned int count)
776{
777 outsw(addr, buffer, count);
778}
779#endif
780
781#ifndef outsl_p
782#define outsl_p outsl_p
783static inline void outsl_p(unsigned long addr, const void *buffer,
784 unsigned int count)
785{
786 outsl(addr, buffer, count);
787}
788#endif
789
790#ifndef CONFIG_GENERIC_IOMAP
791#ifndef ioread8
792#define ioread8 ioread8
793static inline u8 ioread8(const volatile void __iomem *addr)
794{
795 return readb(addr);
796}
797#endif
798
799#ifndef ioread16
800#define ioread16 ioread16
801static inline u16 ioread16(const volatile void __iomem *addr)
802{
803 return readw(addr);
804}
805#endif
806
807#ifndef ioread32
808#define ioread32 ioread32
809static inline u32 ioread32(const volatile void __iomem *addr)
810{
811 return readl(addr);
812}
813#endif
814
815#ifdef CONFIG_64BIT
816#ifndef ioread64
817#define ioread64 ioread64
818static inline u64 ioread64(const volatile void __iomem *addr)
819{
820 return readq(addr);
821}
822#endif
823#endif /* CONFIG_64BIT */
824
825#ifndef iowrite8
826#define iowrite8 iowrite8
827static inline void iowrite8(u8 value, volatile void __iomem *addr)
828{
829 writeb(value, addr);
830}
831#endif
832
833#ifndef iowrite16
834#define iowrite16 iowrite16
835static inline void iowrite16(u16 value, volatile void __iomem *addr)
836{
837 writew(value, addr);
838}
839#endif
840
841#ifndef iowrite32
842#define iowrite32 iowrite32
843static inline void iowrite32(u32 value, volatile void __iomem *addr)
844{
845 writel(value, addr);
846}
847#endif
848
849#ifdef CONFIG_64BIT
850#ifndef iowrite64
851#define iowrite64 iowrite64
852static inline void iowrite64(u64 value, volatile void __iomem *addr)
853{
854 writeq(value, addr);
855}
856#endif
857#endif /* CONFIG_64BIT */
858
859#ifndef ioread16be
860#define ioread16be ioread16be
861static inline u16 ioread16be(const volatile void __iomem *addr)
862{
863 return swab16(readw(addr));
864}
865#endif
866
867#ifndef ioread32be
868#define ioread32be ioread32be
869static inline u32 ioread32be(const volatile void __iomem *addr)
870{
871 return swab32(readl(addr));
872}
873#endif
874
875#ifdef CONFIG_64BIT
876#ifndef ioread64be
877#define ioread64be ioread64be
878static inline u64 ioread64be(const volatile void __iomem *addr)
879{
880 return swab64(readq(addr));
881}
882#endif
883#endif /* CONFIG_64BIT */
884
885#ifndef iowrite16be
886#define iowrite16be iowrite16be
887static inline void iowrite16be(u16 value, void volatile __iomem *addr)
888{
889 writew(swab16(value), addr);
890}
891#endif
892
893#ifndef iowrite32be
894#define iowrite32be iowrite32be
895static inline void iowrite32be(u32 value, volatile void __iomem *addr)
896{
897 writel(swab32(value), addr);
898}
899#endif
900
901#ifdef CONFIG_64BIT
902#ifndef iowrite64be
903#define iowrite64be iowrite64be
904static inline void iowrite64be(u64 value, volatile void __iomem *addr)
905{
906 writeq(swab64(value), addr);
907}
908#endif
909#endif /* CONFIG_64BIT */
910
911#ifndef ioread8_rep
912#define ioread8_rep ioread8_rep
913static inline void ioread8_rep(const volatile void __iomem *addr, void *buffer,
914 unsigned int count)
915{
916 readsb(addr, buffer, count);
917}
918#endif
919
920#ifndef ioread16_rep
921#define ioread16_rep ioread16_rep
922static inline void ioread16_rep(const volatile void __iomem *addr,
923 void *buffer, unsigned int count)
924{
925 readsw(addr, buffer, count);
926}
927#endif
928
929#ifndef ioread32_rep
930#define ioread32_rep ioread32_rep
931static inline void ioread32_rep(const volatile void __iomem *addr,
932 void *buffer, unsigned int count)
933{
934 readsl(addr, buffer, count);
935}
936#endif
937
938#ifdef CONFIG_64BIT
939#ifndef ioread64_rep
940#define ioread64_rep ioread64_rep
941static inline void ioread64_rep(const volatile void __iomem *addr,
942 void *buffer, unsigned int count)
943{
944 readsq(addr, buffer, count);
945}
946#endif
947#endif /* CONFIG_64BIT */
948
949#ifndef iowrite8_rep
950#define iowrite8_rep iowrite8_rep
951static inline void iowrite8_rep(volatile void __iomem *addr,
952 const void *buffer,
953 unsigned int count)
954{
955 writesb(addr, buffer, count);
956}
957#endif
958
959#ifndef iowrite16_rep
960#define iowrite16_rep iowrite16_rep
961static inline void iowrite16_rep(volatile void __iomem *addr,
962 const void *buffer,
963 unsigned int count)
964{
965 writesw(addr, buffer, count);
966}
967#endif
968
969#ifndef iowrite32_rep
970#define iowrite32_rep iowrite32_rep
971static inline void iowrite32_rep(volatile void __iomem *addr,
972 const void *buffer,
973 unsigned int count)
974{
975 writesl(addr, buffer, count);
976}
977#endif
978
979#ifdef CONFIG_64BIT
980#ifndef iowrite64_rep
981#define iowrite64_rep iowrite64_rep
982static inline void iowrite64_rep(volatile void __iomem *addr,
983 const void *buffer,
984 unsigned int count)
985{
986 writesq(addr, buffer, count);
987}
988#endif
989#endif /* CONFIG_64BIT */
990#endif /* CONFIG_GENERIC_IOMAP */
991
992#ifdef __KERNEL__
993
994#include <linux/vmalloc.h>
995#define __io_virt(x) ((void __force *)(x))
996
997/*
998 * Change virtual addresses to physical addresses and vv.
999 * These are pretty trivial
1000 */
1001#ifndef virt_to_phys
1002#define virt_to_phys virt_to_phys
1003static inline unsigned long virt_to_phys(volatile void *address)
1004{
1005 return __pa((unsigned long)address);
1006}
1007#endif
1008
1009#ifndef phys_to_virt
1010#define phys_to_virt phys_to_virt
1011static inline void *phys_to_virt(unsigned long address)
1012{
1013 return __va(address);
1014}
1015#endif
1016
1017/**
1018 * DOC: ioremap() and ioremap_*() variants
1019 *
1020 * Architectures with an MMU are expected to provide ioremap() and iounmap()
1021 * themselves or rely on GENERIC_IOREMAP. For NOMMU architectures we provide
1022 * a default nop-op implementation that expect that the physical address used
1023 * for MMIO are already marked as uncached, and can be used as kernel virtual
1024 * addresses.
1025 *
1026 * ioremap_wc() and ioremap_wt() can provide more relaxed caching attributes
1027 * for specific drivers if the architecture choses to implement them. If they
1028 * are not implemented we fall back to plain ioremap. Conversely, ioremap_np()
1029 * can provide stricter non-posted write semantics if the architecture
1030 * implements them.
1031 */
1032#ifndef CONFIG_MMU
1033#ifndef ioremap
1034#define ioremap ioremap
1035static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
1036{
1037 return (void __iomem *)(unsigned long)offset;
1038}
1039#endif
1040
1041#ifndef iounmap
1042#define iounmap iounmap
1043static inline void iounmap(volatile void __iomem *addr)
1044{
1045}
1046#endif
1047#elif defined(CONFIG_GENERIC_IOREMAP)
1048#include <linux/pgtable.h>
1049
1050void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
1051 pgprot_t prot);
1052
1053void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
1054 unsigned long prot);
1055void iounmap(volatile void __iomem *addr);
1056void generic_iounmap(volatile void __iomem *addr);
1057
1058#ifndef ioremap
1059#define ioremap ioremap
1060static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
1061{
1062 /* _PAGE_IOREMAP needs to be supplied by the architecture */
1063 return ioremap_prot(addr, size, _PAGE_IOREMAP);
1064}
1065#endif
1066#endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
1067
1068#ifndef ioremap_wc
1069#define ioremap_wc ioremap
1070#endif
1071
1072#ifndef ioremap_wt
1073#define ioremap_wt ioremap
1074#endif
1075
1076/*
1077 * ioremap_uc is special in that we do require an explicit architecture
1078 * implementation. In general you do not want to use this function in a
1079 * driver and use plain ioremap, which is uncached by default. Similarly
1080 * architectures should not implement it unless they have a very good
1081 * reason.
1082 */
1083#ifndef ioremap_uc
1084#define ioremap_uc ioremap_uc
1085static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
1086{
1087 return NULL;
1088}
1089#endif
1090
1091/*
1092 * ioremap_np needs an explicit architecture implementation, as it
1093 * requests stronger semantics than regular ioremap(). Portable drivers
1094 * should instead use one of the higher-level abstractions, like
1095 * devm_ioremap_resource(), to choose the correct variant for any given
1096 * device and bus. Portable drivers with a good reason to want non-posted
1097 * write semantics should always provide an ioremap() fallback in case
1098 * ioremap_np() is not available.
1099 */
1100#ifndef ioremap_np
1101#define ioremap_np ioremap_np
1102static inline void __iomem *ioremap_np(phys_addr_t offset, size_t size)
1103{
1104 return NULL;
1105}
1106#endif
1107
1108#ifdef CONFIG_HAS_IOPORT_MAP
1109#ifndef CONFIG_GENERIC_IOMAP
1110#ifndef ioport_map
1111#define ioport_map ioport_map
1112static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
1113{
1114 port &= IO_SPACE_LIMIT;
1115 return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
1116}
1117#define ARCH_HAS_GENERIC_IOPORT_MAP
1118#endif
1119
1120#ifndef ioport_unmap
1121#define ioport_unmap ioport_unmap
1122static inline void ioport_unmap(void __iomem *p)
1123{
1124}
1125#endif
1126#else /* CONFIG_GENERIC_IOMAP */
1127extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
1128extern void ioport_unmap(void __iomem *p);
1129#endif /* CONFIG_GENERIC_IOMAP */
1130#endif /* CONFIG_HAS_IOPORT_MAP */
1131
1132#ifndef CONFIG_GENERIC_IOMAP
1133#ifndef pci_iounmap
1134#define ARCH_WANTS_GENERIC_PCI_IOUNMAP
1135#endif
1136#endif
1137
1138#ifndef xlate_dev_mem_ptr
1139#define xlate_dev_mem_ptr xlate_dev_mem_ptr
1140static inline void *xlate_dev_mem_ptr(phys_addr_t addr)
1141{
1142 return __va(addr);
1143}
1144#endif
1145
1146#ifndef unxlate_dev_mem_ptr
1147#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
1148static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
1149{
1150}
1151#endif
1152
1153#ifndef memset_io
1154#define memset_io memset_io
1155/**
1156 * memset_io Set a range of I/O memory to a constant value
1157 * @addr: The beginning of the I/O-memory range to set
1158 * @val: The value to set the memory to
1159 * @count: The number of bytes to set
1160 *
1161 * Set a range of I/O memory to a given value.
1162 */
1163static inline void memset_io(volatile void __iomem *addr, int value,
1164 size_t size)
1165{
1166 memset(__io_virt(addr), value, size);
1167}
1168#endif
1169
1170#ifndef memcpy_fromio
1171#define memcpy_fromio memcpy_fromio
1172/**
1173 * memcpy_fromio Copy a block of data from I/O memory
1174 * @dst: The (RAM) destination for the copy
1175 * @src: The (I/O memory) source for the data
1176 * @count: The number of bytes to copy
1177 *
1178 * Copy a block of data from I/O memory.
1179 */
1180static inline void memcpy_fromio(void *buffer,
1181 const volatile void __iomem *addr,
1182 size_t size)
1183{
1184 memcpy(buffer, __io_virt(addr), size);
1185}
1186#endif
1187
1188#ifndef memcpy_toio
1189#define memcpy_toio memcpy_toio
1190/**
1191 * memcpy_toio Copy a block of data into I/O memory
1192 * @dst: The (I/O memory) destination for the copy
1193 * @src: The (RAM) source for the data
1194 * @count: The number of bytes to copy
1195 *
1196 * Copy a block of data to I/O memory.
1197 */
1198static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
1199 size_t size)
1200{
1201 memcpy(__io_virt(addr), buffer, size);
1202}
1203#endif
1204
1205extern int devmem_is_allowed(unsigned long pfn);
1206
1207#endif /* __KERNEL__ */
1208
1209#endif /* __ASM_GENERIC_IO_H */