1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* Generic I/O port emulation.
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
7 #ifndef __ASM_GENERIC_IO_H
8 #define __ASM_GENERIC_IO_H
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/sizes.h>
13 #include <linux/types.h>
14 #include <linux/instruction_pointer.h>
16 #ifdef CONFIG_GENERIC_IOMAP
17 #include <asm-generic/iomap.h>
20 #include <asm/mmiowb.h>
21 #include <asm-generic/pci_iomap.h>
24 #define __io_br() barrier()
27 /* prevent prefetching of coherent DMA data ahead of a dma-complete */
30 #define __io_ar(v) rmb()
32 #define __io_ar(v) barrier()
36 /* flush writes to coherent DMA data before possibly triggering a DMA read */
39 #define __io_bw() wmb()
41 #define __io_bw() barrier()
45 /* serialize device access against a spin_unlock, usually handled there. */
47 #define __io_aw() mmiowb_set_pending()
51 #define __io_pbw() __io_bw()
55 #define __io_paw() __io_aw()
59 #define __io_pbr() __io_br()
63 #define __io_par(v) __io_ar(v)
67 * "__DISABLE_TRACE_MMIO__" flag can be used to disable MMIO tracing for
68 * specific kernel drivers in case of excessive/unwanted logging.
70 * Usage: Add a #define flag at the beginning of the driver file.
71 * Ex: #define __DISABLE_TRACE_MMIO__
75 #if IS_ENABLED(CONFIG_TRACE_MMIO_ACCESS) && !(defined(__DISABLE_TRACE_MMIO__))
76 #include <linux/tracepoint-defs.h>
78 DECLARE_TRACEPOINT(rwmmio_write);
79 DECLARE_TRACEPOINT(rwmmio_post_write);
80 DECLARE_TRACEPOINT(rwmmio_read);
81 DECLARE_TRACEPOINT(rwmmio_post_read);
83 void log_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
84 unsigned long caller_addr, unsigned long caller_addr0);
85 void log_post_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
86 unsigned long caller_addr, unsigned long caller_addr0);
87 void log_read_mmio(u8 width, const volatile void __iomem *addr,
88 unsigned long caller_addr, unsigned long caller_addr0);
89 void log_post_read_mmio(u64 val, u8 width, const volatile void __iomem *addr,
90 unsigned long caller_addr, unsigned long caller_addr0);
94 static inline void log_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
95 unsigned long caller_addr, unsigned long caller_addr0) {}
96 static inline void log_post_write_mmio(u64 val, u8 width, volatile void __iomem *addr,
97 unsigned long caller_addr, unsigned long caller_addr0) {}
98 static inline void log_read_mmio(u8 width, const volatile void __iomem *addr,
99 unsigned long caller_addr, unsigned long caller_addr0) {}
100 static inline void log_post_read_mmio(u64 val, u8 width, const volatile void __iomem *addr,
101 unsigned long caller_addr, unsigned long caller_addr0) {}
103 #endif /* CONFIG_TRACE_MMIO_ACCESS */
106 * __raw_{read,write}{b,w,l,q}() access memory in native endianness.
108 * On some architectures memory mapped IO needs to be accessed differently.
109 * On the simple architectures, we just read/write the memory location
114 #define __raw_readb __raw_readb
115 static inline u8 __raw_readb(const volatile void __iomem *addr)
117 return *(const volatile u8 __force *)addr;
122 #define __raw_readw __raw_readw
123 static inline u16 __raw_readw(const volatile void __iomem *addr)
125 return *(const volatile u16 __force *)addr;
130 #define __raw_readl __raw_readl
131 static inline u32 __raw_readl(const volatile void __iomem *addr)
133 return *(const volatile u32 __force *)addr;
139 #define __raw_readq __raw_readq
140 static inline u64 __raw_readq(const volatile void __iomem *addr)
142 return *(const volatile u64 __force *)addr;
145 #endif /* CONFIG_64BIT */
148 #define __raw_writeb __raw_writeb
149 static inline void __raw_writeb(u8 value, volatile void __iomem *addr)
151 *(volatile u8 __force *)addr = value;
156 #define __raw_writew __raw_writew
157 static inline void __raw_writew(u16 value, volatile void __iomem *addr)
159 *(volatile u16 __force *)addr = value;
164 #define __raw_writel __raw_writel
165 static inline void __raw_writel(u32 value, volatile void __iomem *addr)
167 *(volatile u32 __force *)addr = value;
173 #define __raw_writeq __raw_writeq
174 static inline void __raw_writeq(u64 value, volatile void __iomem *addr)
176 *(volatile u64 __force *)addr = value;
179 #endif /* CONFIG_64BIT */
182 * {read,write}{b,w,l,q}() access little endian memory and return result in
188 static inline u8 readb(const volatile void __iomem *addr)
192 log_read_mmio(8, addr, _THIS_IP_, _RET_IP_);
194 val = __raw_readb(addr);
196 log_post_read_mmio(val, 8, addr, _THIS_IP_, _RET_IP_);
203 static inline u16 readw(const volatile void __iomem *addr)
207 log_read_mmio(16, addr, _THIS_IP_, _RET_IP_);
209 val = __le16_to_cpu((__le16 __force)__raw_readw(addr));
211 log_post_read_mmio(val, 16, addr, _THIS_IP_, _RET_IP_);
218 static inline u32 readl(const volatile void __iomem *addr)
222 log_read_mmio(32, addr, _THIS_IP_, _RET_IP_);
224 val = __le32_to_cpu((__le32 __force)__raw_readl(addr));
226 log_post_read_mmio(val, 32, addr, _THIS_IP_, _RET_IP_);
234 static inline u64 readq(const volatile void __iomem *addr)
238 log_read_mmio(64, addr, _THIS_IP_, _RET_IP_);
240 val = __le64_to_cpu((__le64 __force)__raw_readq(addr));
242 log_post_read_mmio(val, 64, addr, _THIS_IP_, _RET_IP_);
246 #endif /* CONFIG_64BIT */
249 #define writeb writeb
250 static inline void writeb(u8 value, volatile void __iomem *addr)
252 log_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
254 __raw_writeb(value, addr);
256 log_post_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
261 #define writew writew
262 static inline void writew(u16 value, volatile void __iomem *addr)
264 log_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
266 __raw_writew((u16 __force)cpu_to_le16(value), addr);
268 log_post_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
273 #define writel writel
274 static inline void writel(u32 value, volatile void __iomem *addr)
276 log_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
278 __raw_writel((u32 __force)__cpu_to_le32(value), addr);
280 log_post_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
286 #define writeq writeq
287 static inline void writeq(u64 value, volatile void __iomem *addr)
289 log_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
291 __raw_writeq((u64 __force)__cpu_to_le64(value), addr);
293 log_post_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
296 #endif /* CONFIG_64BIT */
299 * {read,write}{b,w,l,q}_relaxed() are like the regular version, but
300 * are not guaranteed to provide ordering against spinlocks or memory
303 #ifndef readb_relaxed
304 #define readb_relaxed readb_relaxed
305 static inline u8 readb_relaxed(const volatile void __iomem *addr)
309 log_read_mmio(8, addr, _THIS_IP_, _RET_IP_);
310 val = __raw_readb(addr);
311 log_post_read_mmio(val, 8, addr, _THIS_IP_, _RET_IP_);
316 #ifndef readw_relaxed
317 #define readw_relaxed readw_relaxed
318 static inline u16 readw_relaxed(const volatile void __iomem *addr)
322 log_read_mmio(16, addr, _THIS_IP_, _RET_IP_);
323 val = __le16_to_cpu((__le16 __force)__raw_readw(addr));
324 log_post_read_mmio(val, 16, addr, _THIS_IP_, _RET_IP_);
329 #ifndef readl_relaxed
330 #define readl_relaxed readl_relaxed
331 static inline u32 readl_relaxed(const volatile void __iomem *addr)
335 log_read_mmio(32, addr, _THIS_IP_, _RET_IP_);
336 val = __le32_to_cpu((__le32 __force)__raw_readl(addr));
337 log_post_read_mmio(val, 32, addr, _THIS_IP_, _RET_IP_);
342 #if defined(readq) && !defined(readq_relaxed)
343 #define readq_relaxed readq_relaxed
344 static inline u64 readq_relaxed(const volatile void __iomem *addr)
348 log_read_mmio(64, addr, _THIS_IP_, _RET_IP_);
349 val = __le64_to_cpu((__le64 __force)__raw_readq(addr));
350 log_post_read_mmio(val, 64, addr, _THIS_IP_, _RET_IP_);
355 #ifndef writeb_relaxed
356 #define writeb_relaxed writeb_relaxed
357 static inline void writeb_relaxed(u8 value, volatile void __iomem *addr)
359 log_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
360 __raw_writeb(value, addr);
361 log_post_write_mmio(value, 8, addr, _THIS_IP_, _RET_IP_);
365 #ifndef writew_relaxed
366 #define writew_relaxed writew_relaxed
367 static inline void writew_relaxed(u16 value, volatile void __iomem *addr)
369 log_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
370 __raw_writew((u16 __force)cpu_to_le16(value), addr);
371 log_post_write_mmio(value, 16, addr, _THIS_IP_, _RET_IP_);
375 #ifndef writel_relaxed
376 #define writel_relaxed writel_relaxed
377 static inline void writel_relaxed(u32 value, volatile void __iomem *addr)
379 log_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
380 __raw_writel((u32 __force)__cpu_to_le32(value), addr);
381 log_post_write_mmio(value, 32, addr, _THIS_IP_, _RET_IP_);
385 #if defined(writeq) && !defined(writeq_relaxed)
386 #define writeq_relaxed writeq_relaxed
387 static inline void writeq_relaxed(u64 value, volatile void __iomem *addr)
389 log_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
390 __raw_writeq((u64 __force)__cpu_to_le64(value), addr);
391 log_post_write_mmio(value, 64, addr, _THIS_IP_, _RET_IP_);
396 * {read,write}s{b,w,l,q}() repeatedly access the same memory address in
397 * native endianness in 8-, 16-, 32- or 64-bit chunks (@count times).
400 #define readsb readsb
401 static inline void readsb(const volatile void __iomem *addr, void *buffer,
408 u8 x = __raw_readb(addr);
416 #define readsw readsw
417 static inline void readsw(const volatile void __iomem *addr, void *buffer,
424 u16 x = __raw_readw(addr);
432 #define readsl readsl
433 static inline void readsl(const volatile void __iomem *addr, void *buffer,
440 u32 x = __raw_readl(addr);
449 #define readsq readsq
450 static inline void readsq(const volatile void __iomem *addr, void *buffer,
457 u64 x = __raw_readq(addr);
463 #endif /* CONFIG_64BIT */
466 #define writesb writesb
467 static inline void writesb(volatile void __iomem *addr, const void *buffer,
471 const u8 *buf = buffer;
474 __raw_writeb(*buf++, addr);
481 #define writesw writesw
482 static inline void writesw(volatile void __iomem *addr, const void *buffer,
486 const u16 *buf = buffer;
489 __raw_writew(*buf++, addr);
496 #define writesl writesl
497 static inline void writesl(volatile void __iomem *addr, const void *buffer,
501 const u32 *buf = buffer;
504 __raw_writel(*buf++, addr);
512 #define writesq writesq
513 static inline void writesq(volatile void __iomem *addr, const void *buffer,
517 const u64 *buf = buffer;
520 __raw_writeq(*buf++, addr);
525 #endif /* CONFIG_64BIT */
528 #define PCI_IOBASE ((void __iomem *)0)
531 #ifndef IO_SPACE_LIMIT
532 #define IO_SPACE_LIMIT 0xffff
536 * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
537 * implemented on hardware that needs an additional delay for I/O accesses to
541 #if !defined(inb) && !defined(_inb)
543 static inline u8 _inb(unsigned long addr)
548 val = __raw_readb(PCI_IOBASE + addr);
554 #if !defined(inw) && !defined(_inw)
556 static inline u16 _inw(unsigned long addr)
561 val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
567 #if !defined(inl) && !defined(_inl)
569 static inline u32 _inl(unsigned long addr)
574 val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
580 #if !defined(outb) && !defined(_outb)
582 static inline void _outb(u8 value, unsigned long addr)
585 __raw_writeb(value, PCI_IOBASE + addr);
590 #if !defined(outw) && !defined(_outw)
592 static inline void _outw(u16 value, unsigned long addr)
595 __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
600 #if !defined(outl) && !defined(_outl)
602 static inline void _outl(u32 value, unsigned long addr)
605 __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
610 #include <linux/logic_pio.h>
638 static inline u8 inb_p(unsigned long addr)
646 static inline u16 inw_p(unsigned long addr)
654 static inline u32 inl_p(unsigned long addr)
661 #define outb_p outb_p
662 static inline void outb_p(u8 value, unsigned long addr)
669 #define outw_p outw_p
670 static inline void outw_p(u16 value, unsigned long addr)
677 #define outl_p outl_p
678 static inline void outl_p(u32 value, unsigned long addr)
685 * {in,out}s{b,w,l}{,_p}() are variants of the above that repeatedly access a
686 * single I/O port multiple times.
691 static inline void insb(unsigned long addr, void *buffer, unsigned int count)
693 readsb(PCI_IOBASE + addr, buffer, count);
699 static inline void insw(unsigned long addr, void *buffer, unsigned int count)
701 readsw(PCI_IOBASE + addr, buffer, count);
707 static inline void insl(unsigned long addr, void *buffer, unsigned int count)
709 readsl(PCI_IOBASE + addr, buffer, count);
715 static inline void outsb(unsigned long addr, const void *buffer,
718 writesb(PCI_IOBASE + addr, buffer, count);
724 static inline void outsw(unsigned long addr, const void *buffer,
727 writesw(PCI_IOBASE + addr, buffer, count);
733 static inline void outsl(unsigned long addr, const void *buffer,
736 writesl(PCI_IOBASE + addr, buffer, count);
741 #define insb_p insb_p
742 static inline void insb_p(unsigned long addr, void *buffer, unsigned int count)
744 insb(addr, buffer, count);
749 #define insw_p insw_p
750 static inline void insw_p(unsigned long addr, void *buffer, unsigned int count)
752 insw(addr, buffer, count);
757 #define insl_p insl_p
758 static inline void insl_p(unsigned long addr, void *buffer, unsigned int count)
760 insl(addr, buffer, count);
765 #define outsb_p outsb_p
766 static inline void outsb_p(unsigned long addr, const void *buffer,
769 outsb(addr, buffer, count);
774 #define outsw_p outsw_p
775 static inline void outsw_p(unsigned long addr, const void *buffer,
778 outsw(addr, buffer, count);
783 #define outsl_p outsl_p
784 static inline void outsl_p(unsigned long addr, const void *buffer,
787 outsl(addr, buffer, count);
791 #ifndef CONFIG_GENERIC_IOMAP
793 #define ioread8 ioread8
794 static inline u8 ioread8(const volatile void __iomem *addr)
801 #define ioread16 ioread16
802 static inline u16 ioread16(const volatile void __iomem *addr)
809 #define ioread32 ioread32
810 static inline u32 ioread32(const volatile void __iomem *addr)
818 #define ioread64 ioread64
819 static inline u64 ioread64(const volatile void __iomem *addr)
824 #endif /* CONFIG_64BIT */
827 #define iowrite8 iowrite8
828 static inline void iowrite8(u8 value, volatile void __iomem *addr)
835 #define iowrite16 iowrite16
836 static inline void iowrite16(u16 value, volatile void __iomem *addr)
843 #define iowrite32 iowrite32
844 static inline void iowrite32(u32 value, volatile void __iomem *addr)
852 #define iowrite64 iowrite64
853 static inline void iowrite64(u64 value, volatile void __iomem *addr)
858 #endif /* CONFIG_64BIT */
861 #define ioread16be ioread16be
862 static inline u16 ioread16be(const volatile void __iomem *addr)
864 return swab16(readw(addr));
869 #define ioread32be ioread32be
870 static inline u32 ioread32be(const volatile void __iomem *addr)
872 return swab32(readl(addr));
878 #define ioread64be ioread64be
879 static inline u64 ioread64be(const volatile void __iomem *addr)
881 return swab64(readq(addr));
884 #endif /* CONFIG_64BIT */
887 #define iowrite16be iowrite16be
888 static inline void iowrite16be(u16 value, void volatile __iomem *addr)
890 writew(swab16(value), addr);
895 #define iowrite32be iowrite32be
896 static inline void iowrite32be(u32 value, volatile void __iomem *addr)
898 writel(swab32(value), addr);
904 #define iowrite64be iowrite64be
905 static inline void iowrite64be(u64 value, volatile void __iomem *addr)
907 writeq(swab64(value), addr);
910 #endif /* CONFIG_64BIT */
913 #define ioread8_rep ioread8_rep
914 static inline void ioread8_rep(const volatile void __iomem *addr, void *buffer,
917 readsb(addr, buffer, count);
922 #define ioread16_rep ioread16_rep
923 static inline void ioread16_rep(const volatile void __iomem *addr,
924 void *buffer, unsigned int count)
926 readsw(addr, buffer, count);
931 #define ioread32_rep ioread32_rep
932 static inline void ioread32_rep(const volatile void __iomem *addr,
933 void *buffer, unsigned int count)
935 readsl(addr, buffer, count);
941 #define ioread64_rep ioread64_rep
942 static inline void ioread64_rep(const volatile void __iomem *addr,
943 void *buffer, unsigned int count)
945 readsq(addr, buffer, count);
948 #endif /* CONFIG_64BIT */
951 #define iowrite8_rep iowrite8_rep
952 static inline void iowrite8_rep(volatile void __iomem *addr,
956 writesb(addr, buffer, count);
960 #ifndef iowrite16_rep
961 #define iowrite16_rep iowrite16_rep
962 static inline void iowrite16_rep(volatile void __iomem *addr,
966 writesw(addr, buffer, count);
970 #ifndef iowrite32_rep
971 #define iowrite32_rep iowrite32_rep
972 static inline void iowrite32_rep(volatile void __iomem *addr,
976 writesl(addr, buffer, count);
981 #ifndef iowrite64_rep
982 #define iowrite64_rep iowrite64_rep
983 static inline void iowrite64_rep(volatile void __iomem *addr,
987 writesq(addr, buffer, count);
990 #endif /* CONFIG_64BIT */
991 #endif /* CONFIG_GENERIC_IOMAP */
995 #define __io_virt(x) ((void __force *)(x))
998 * Change virtual addresses to physical addresses and vv.
999 * These are pretty trivial
1001 #ifndef virt_to_phys
1002 #define virt_to_phys virt_to_phys
1003 static inline unsigned long virt_to_phys(volatile void *address)
1005 return __pa((unsigned long)address);
1009 #ifndef phys_to_virt
1010 #define phys_to_virt phys_to_virt
1011 static inline void *phys_to_virt(unsigned long address)
1013 return __va(address);
1018 * DOC: ioremap() and ioremap_*() variants
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
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
1034 #define ioremap ioremap
1035 static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
1037 return (void __iomem *)(unsigned long)offset;
1042 #define iounmap iounmap
1043 static inline void iounmap(volatile void __iomem *addr)
1047 #elif defined(CONFIG_GENERIC_IOREMAP)
1048 #include <linux/pgtable.h>
1050 void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
1053 void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
1054 unsigned long prot);
1055 void iounmap(volatile void __iomem *addr);
1056 void generic_iounmap(volatile void __iomem *addr);
1059 #define ioremap ioremap
1060 static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
1062 /* _PAGE_IOREMAP needs to be supplied by the architecture */
1063 return ioremap_prot(addr, size, _PAGE_IOREMAP);
1066 #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
1069 #define ioremap_wc ioremap
1073 #define ioremap_wt ioremap
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
1084 #define ioremap_uc ioremap_uc
1085 static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
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.
1101 #define ioremap_np ioremap_np
1102 static inline void __iomem *ioremap_np(phys_addr_t offset, size_t size)
1108 #ifdef CONFIG_HAS_IOPORT_MAP
1109 #ifndef CONFIG_GENERIC_IOMAP
1111 #define ioport_map ioport_map
1112 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
1114 port &= IO_SPACE_LIMIT;
1115 return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
1117 #define ARCH_HAS_GENERIC_IOPORT_MAP
1120 #ifndef ioport_unmap
1121 #define ioport_unmap ioport_unmap
1122 static inline void ioport_unmap(void __iomem *p)
1126 #else /* CONFIG_GENERIC_IOMAP */
1127 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
1128 extern void ioport_unmap(void __iomem *p);
1129 #endif /* CONFIG_GENERIC_IOMAP */
1130 #endif /* CONFIG_HAS_IOPORT_MAP */
1132 #ifndef CONFIG_GENERIC_IOMAP
1134 #define ARCH_WANTS_GENERIC_PCI_IOUNMAP
1138 #ifndef xlate_dev_mem_ptr
1139 #define xlate_dev_mem_ptr xlate_dev_mem_ptr
1140 static inline void *xlate_dev_mem_ptr(phys_addr_t addr)
1146 #ifndef unxlate_dev_mem_ptr
1147 #define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
1148 static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
1154 #define memset_io memset_io
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
1161 * Set a range of I/O memory to a given value.
1163 static inline void memset_io(volatile void __iomem *addr, int value,
1166 memset(__io_virt(addr), value, size);
1170 #ifndef memcpy_fromio
1171 #define memcpy_fromio memcpy_fromio
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
1178 * Copy a block of data from I/O memory.
1180 static inline void memcpy_fromio(void *buffer,
1181 const volatile void __iomem *addr,
1184 memcpy(buffer, __io_virt(addr), size);
1189 #define memcpy_toio memcpy_toio
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
1196 * Copy a block of data to I/O memory.
1198 static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
1201 memcpy(__io_virt(addr), buffer, size);
1205 extern int devmem_is_allowed(unsigned long pfn);
1207 #endif /* __KERNEL__ */
1209 #endif /* __ASM_GENERIC_IO_H */