1c8d29696f
* 'io' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux: documentation: memory-barriers: clarify relaxed io accessor semantics x86: io: implement dummy relaxed accessor macros for writes tile: io: implement dummy relaxed accessor macros for writes sparc: io: implement dummy relaxed accessor macros for writes powerpc: io: implement dummy relaxed accessor macros for writes parisc: io: implement dummy relaxed accessor macros for writes mn10300: io: implement dummy relaxed accessor macros for writes m68k: io: implement dummy relaxed accessor macros for writes m32r: io: implement dummy relaxed accessor macros for writes ia64: io: implement dummy relaxed accessor macros for writes cris: io: implement dummy relaxed accessor macros for writes frv: io: implement dummy relaxed accessor macros for writes xtensa: io: remove dummy relaxed accessor macros for reads s390: io: remove dummy relaxed accessor macros for reads microblaze: io: remove dummy relaxed accessor macros asm-generic: io: implement relaxed accessor macros as conditional wrappers Conflicts: include/asm-generic/io.h Signed-off-by: Arnd Bergmann <arnd@arndb.de>
877 lines
17 KiB
C
877 lines
17 KiB
C
/* Generic I/O port emulation, based on MN10300 code
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef __ASM_GENERIC_IO_H
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#define __ASM_GENERIC_IO_H
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#include <asm/page.h> /* I/O is all done through memory accesses */
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#include <linux/string.h> /* for memset() and memcpy() */
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#include <linux/types.h>
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#ifdef CONFIG_GENERIC_IOMAP
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#include <asm-generic/iomap.h>
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#endif
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#include <asm-generic/pci_iomap.h>
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#ifndef mmiowb
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#define mmiowb() do {} while (0)
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#endif
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/*
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* __raw_{read,write}{b,w,l,q}() access memory in native endianness.
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*
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* On some architectures memory mapped IO needs to be accessed differently.
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* On the simple architectures, we just read/write the memory location
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* directly.
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*/
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#ifndef __raw_readb
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#define __raw_readb __raw_readb
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static inline u8 __raw_readb(const volatile void __iomem *addr)
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{
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return *(const volatile u8 __force *)addr;
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}
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#endif
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#ifndef __raw_readw
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#define __raw_readw __raw_readw
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static inline u16 __raw_readw(const volatile void __iomem *addr)
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{
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return *(const volatile u16 __force *)addr;
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}
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#endif
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#ifndef __raw_readl
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#define __raw_readl __raw_readl
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static inline u32 __raw_readl(const volatile void __iomem *addr)
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{
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return *(const volatile u32 __force *)addr;
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}
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#endif
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#ifdef CONFIG_64BIT
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#ifndef __raw_readq
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#define __raw_readq __raw_readq
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static inline u64 __raw_readq(const volatile void __iomem *addr)
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{
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return *(const volatile u64 __force *)addr;
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}
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#endif
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#endif /* CONFIG_64BIT */
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#ifndef __raw_writeb
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#define __raw_writeb __raw_writeb
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static inline void __raw_writeb(u8 value, volatile void __iomem *addr)
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{
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*(volatile u8 __force *)addr = value;
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}
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#endif
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#ifndef __raw_writew
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#define __raw_writew __raw_writew
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static inline void __raw_writew(u16 value, volatile void __iomem *addr)
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{
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*(volatile u16 __force *)addr = value;
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}
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#endif
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#ifndef __raw_writel
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#define __raw_writel __raw_writel
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static inline void __raw_writel(u32 value, volatile void __iomem *addr)
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{
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*(volatile u32 __force *)addr = value;
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}
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#endif
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#ifdef CONFIG_64BIT
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#ifndef __raw_writeq
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#define __raw_writeq __raw_writeq
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static inline void __raw_writeq(u64 value, volatile void __iomem *addr)
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{
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*(volatile u64 __force *)addr = value;
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}
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#endif
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#endif /* CONFIG_64BIT */
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/*
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* {read,write}{b,w,l,q}() access little endian memory and return result in
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* native endianness.
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*/
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#ifndef readb
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#define readb readb
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static inline u8 readb(const volatile void __iomem *addr)
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{
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return __raw_readb(addr);
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}
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#endif
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#ifndef readw
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#define readw readw
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static inline u16 readw(const volatile void __iomem *addr)
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{
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return __le16_to_cpu(__raw_readw(addr));
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}
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#endif
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#ifndef readl
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#define readl readl
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static inline u32 readl(const volatile void __iomem *addr)
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{
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return __le32_to_cpu(__raw_readl(addr));
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}
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#endif
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#ifdef CONFIG_64BIT
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#ifndef readq
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#define readq readq
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static inline u64 readq(const volatile void __iomem *addr)
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{
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return __le64_to_cpu(__raw_readq(addr));
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}
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#endif
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#endif /* CONFIG_64BIT */
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#ifndef writeb
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#define writeb writeb
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static inline void writeb(u8 value, volatile void __iomem *addr)
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{
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__raw_writeb(value, addr);
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}
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#endif
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#ifndef writew
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#define writew writew
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static inline void writew(u16 value, volatile void __iomem *addr)
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{
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__raw_writew(cpu_to_le16(value), addr);
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}
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#endif
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#ifndef writel
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#define writel writel
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static inline void writel(u32 value, volatile void __iomem *addr)
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{
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__raw_writel(__cpu_to_le32(value), addr);
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}
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#endif
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#ifdef CONFIG_64BIT
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#ifndef writeq
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#define writeq writeq
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static inline void writeq(u64 value, volatile void __iomem *addr)
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{
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__raw_writeq(__cpu_to_le64(value), addr);
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}
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#endif
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#endif /* CONFIG_64BIT */
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/*
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* {read,write}{b,w,l,q}_relaxed() are like the regular version, but
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* are not guaranteed to provide ordering against spinlocks or memory
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* accesses.
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*/
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#ifndef readb_relaxed
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#define readb_relaxed readb
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#endif
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#ifndef readw_relaxed
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#define readw_relaxed readw
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#endif
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#ifndef readl_relaxed
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#define readl_relaxed readl
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#endif
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#ifndef readq_relaxed
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#define readq_relaxed readq
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#endif
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#ifndef writeb_relaxed
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#define writeb_relaxed writeb
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#endif
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#ifndef writew_relaxed
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#define writew_relaxed writew
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#endif
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#ifndef writel_relaxed
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#define writel_relaxed writel
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#endif
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#ifndef writeq_relaxed
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#define writeq_relaxed writeq
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#endif
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/*
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* {read,write}s{b,w,l,q}() repeatedly access the same memory address in
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* native endianness in 8-, 16-, 32- or 64-bit chunks (@count times).
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*/
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#ifndef readsb
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#define readsb readsb
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static inline void readsb(const volatile void __iomem *addr, void *buffer,
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unsigned int count)
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{
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if (count) {
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u8 *buf = buffer;
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do {
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u8 x = __raw_readb(addr);
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*buf++ = x;
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} while (--count);
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}
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}
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#endif
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#ifndef readsw
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#define readsw readsw
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static inline void readsw(const volatile void __iomem *addr, void *buffer,
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unsigned int count)
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{
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if (count) {
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u16 *buf = buffer;
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do {
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u16 x = __raw_readw(addr);
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*buf++ = x;
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} while (--count);
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}
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}
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#endif
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#ifndef readsl
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#define readsl readsl
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static inline void readsl(const volatile void __iomem *addr, void *buffer,
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unsigned int count)
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{
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if (count) {
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u32 *buf = buffer;
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do {
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u32 x = __raw_readl(addr);
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*buf++ = x;
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} while (--count);
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}
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}
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#endif
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#ifdef CONFIG_64BIT
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#ifndef readsq
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#define readsq readsq
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static inline void readsq(const volatile void __iomem *addr, void *buffer,
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unsigned int count)
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{
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if (count) {
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u64 *buf = buffer;
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do {
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u64 x = __raw_readq(addr);
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*buf++ = x;
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} while (--count);
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}
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}
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#endif
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#endif /* CONFIG_64BIT */
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#ifndef writesb
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#define writesb writesb
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static inline void writesb(volatile void __iomem *addr, const void *buffer,
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unsigned int count)
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{
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if (count) {
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const u8 *buf = buffer;
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do {
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__raw_writeb(*buf++, addr);
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} while (--count);
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}
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}
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#endif
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#ifndef writesw
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#define writesw writesw
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static inline void writesw(volatile void __iomem *addr, const void *buffer,
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unsigned int count)
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{
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if (count) {
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const u16 *buf = buffer;
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do {
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__raw_writew(*buf++, addr);
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} while (--count);
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}
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}
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#endif
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#ifndef writesl
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#define writesl writesl
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static inline void writesl(volatile void __iomem *addr, const void *buffer,
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unsigned int count)
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{
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if (count) {
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const u32 *buf = buffer;
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do {
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__raw_writel(*buf++, addr);
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} while (--count);
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}
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}
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#endif
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#ifdef CONFIG_64BIT
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#ifndef writesq
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#define writesq writesq
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static inline void writesq(volatile void __iomem *addr, const void *buffer,
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unsigned int count)
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{
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if (count) {
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const u64 *buf = buffer;
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do {
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__raw_writeq(*buf++, addr);
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} while (--count);
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}
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}
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#endif
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#endif /* CONFIG_64BIT */
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#ifndef PCI_IOBASE
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#define PCI_IOBASE ((void __iomem *)0)
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#endif
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#ifndef IO_SPACE_LIMIT
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#define IO_SPACE_LIMIT 0xffff
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#endif
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/*
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* {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
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* implemented on hardware that needs an additional delay for I/O accesses to
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* take effect.
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*/
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#ifndef inb
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#define inb inb
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static inline u8 inb(unsigned long addr)
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{
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return readb(PCI_IOBASE + addr);
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}
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#endif
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#ifndef inw
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#define inw inw
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static inline u16 inw(unsigned long addr)
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{
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return readw(PCI_IOBASE + addr);
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}
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#endif
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#ifndef inl
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#define inl inl
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static inline u32 inl(unsigned long addr)
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{
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return readl(PCI_IOBASE + addr);
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}
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#endif
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#ifndef outb
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#define outb outb
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static inline void outb(u8 value, unsigned long addr)
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{
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writeb(value, PCI_IOBASE + addr);
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}
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#endif
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#ifndef outw
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#define outw outw
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static inline void outw(u16 value, unsigned long addr)
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{
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writew(value, PCI_IOBASE + addr);
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}
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#endif
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#ifndef outl
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#define outl outl
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static inline void outl(u32 value, unsigned long addr)
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{
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writel(value, PCI_IOBASE + addr);
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}
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#endif
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#ifndef inb_p
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#define inb_p inb_p
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static inline u8 inb_p(unsigned long addr)
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{
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return inb(addr);
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}
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#endif
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#ifndef inw_p
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#define inw_p inw_p
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static inline u16 inw_p(unsigned long addr)
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{
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return inw(addr);
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}
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#endif
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#ifndef inl_p
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#define inl_p inl_p
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static inline u32 inl_p(unsigned long addr)
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{
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return inl(addr);
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}
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#endif
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#ifndef outb_p
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#define outb_p outb_p
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static inline void outb_p(u8 value, unsigned long addr)
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{
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outb(value, addr);
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}
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#endif
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#ifndef outw_p
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#define outw_p outw_p
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static inline void outw_p(u16 value, unsigned long addr)
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{
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outw(value, addr);
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}
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#endif
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#ifndef outl_p
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#define outl_p outl_p
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static inline void outl_p(u32 value, unsigned long addr)
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{
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outl(value, addr);
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}
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#endif
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/*
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* {in,out}s{b,w,l}{,_p}() are variants of the above that repeatedly access a
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* single I/O port multiple times.
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*/
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#ifndef insb
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#define insb insb
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static inline void insb(unsigned long addr, void *buffer, unsigned int count)
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{
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readsb(PCI_IOBASE + addr, buffer, count);
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}
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#endif
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#ifndef insw
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#define insw insw
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static inline void insw(unsigned long addr, void *buffer, unsigned int count)
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{
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readsw(PCI_IOBASE + addr, buffer, count);
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}
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#endif
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#ifndef insl
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#define insl insl
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static inline void insl(unsigned long addr, void *buffer, unsigned int count)
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{
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readsl(PCI_IOBASE + addr, buffer, count);
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}
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#endif
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#ifndef outsb
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#define outsb outsb
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static inline void outsb(unsigned long addr, const void *buffer,
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unsigned int count)
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{
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writesb(PCI_IOBASE + addr, buffer, count);
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}
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#endif
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#ifndef outsw
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#define outsw outsw
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static inline void outsw(unsigned long addr, const void *buffer,
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unsigned int count)
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{
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writesw(PCI_IOBASE + addr, buffer, count);
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}
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#endif
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#ifndef outsl
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#define outsl outsl
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static inline void outsl(unsigned long addr, const void *buffer,
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unsigned int count)
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{
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writesl(PCI_IOBASE + addr, buffer, count);
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}
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#endif
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#ifndef insb_p
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#define insb_p insb_p
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static inline void insb_p(unsigned long addr, void *buffer, unsigned int count)
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{
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insb(addr, buffer, count);
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}
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#endif
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#ifndef insw_p
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#define insw_p insw_p
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static inline void insw_p(unsigned long addr, void *buffer, unsigned int count)
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{
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insw(addr, buffer, count);
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}
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#endif
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#ifndef insl_p
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#define insl_p insl_p
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static inline void insl_p(unsigned long addr, void *buffer, unsigned int count)
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{
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insl(addr, buffer, count);
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}
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#endif
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#ifndef outsb_p
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#define outsb_p outsb_p
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static inline void outsb_p(unsigned long addr, const void *buffer,
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unsigned int count)
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{
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outsb(addr, buffer, count);
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}
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#endif
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#ifndef outsw_p
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#define outsw_p outsw_p
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static inline void outsw_p(unsigned long addr, const void *buffer,
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unsigned int count)
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{
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outsw(addr, buffer, count);
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}
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#endif
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#ifndef outsl_p
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#define outsl_p outsl_p
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static inline void outsl_p(unsigned long addr, const void *buffer,
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unsigned int count)
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{
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outsl(addr, buffer, count);
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}
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#endif
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#ifndef CONFIG_GENERIC_IOMAP
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#ifndef ioread8
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#define ioread8 ioread8
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static inline u8 ioread8(const volatile void __iomem *addr)
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{
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return readb(addr);
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}
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#endif
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#ifndef ioread16
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#define ioread16 ioread16
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static inline u16 ioread16(const volatile void __iomem *addr)
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{
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return readw(addr);
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}
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#endif
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#ifndef ioread32
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#define ioread32 ioread32
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static inline u32 ioread32(const volatile void __iomem *addr)
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{
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return readl(addr);
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}
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#endif
|
|
|
|
#ifndef iowrite8
|
|
#define iowrite8 iowrite8
|
|
static inline void iowrite8(u8 value, volatile void __iomem *addr)
|
|
{
|
|
writeb(value, addr);
|
|
}
|
|
#endif
|
|
|
|
#ifndef iowrite16
|
|
#define iowrite16 iowrite16
|
|
static inline void iowrite16(u16 value, volatile void __iomem *addr)
|
|
{
|
|
writew(value, addr);
|
|
}
|
|
#endif
|
|
|
|
#ifndef iowrite32
|
|
#define iowrite32 iowrite32
|
|
static inline void iowrite32(u32 value, volatile void __iomem *addr)
|
|
{
|
|
writel(value, addr);
|
|
}
|
|
#endif
|
|
|
|
#ifndef ioread16be
|
|
#define ioread16be ioread16be
|
|
static inline u16 ioread16be(const volatile void __iomem *addr)
|
|
{
|
|
return __be16_to_cpu(__raw_readw(addr));
|
|
}
|
|
#endif
|
|
|
|
#ifndef ioread32be
|
|
#define ioread32be ioread32be
|
|
static inline u32 ioread32be(const volatile void __iomem *addr)
|
|
{
|
|
return __be32_to_cpu(__raw_readl(addr));
|
|
}
|
|
#endif
|
|
|
|
#ifndef iowrite16be
|
|
#define iowrite16be iowrite16be
|
|
static inline void iowrite16be(u16 value, void volatile __iomem *addr)
|
|
{
|
|
__raw_writew(__cpu_to_be16(value), addr);
|
|
}
|
|
#endif
|
|
|
|
#ifndef iowrite32be
|
|
#define iowrite32be iowrite32be
|
|
static inline void iowrite32be(u32 value, volatile void __iomem *addr)
|
|
{
|
|
__raw_writel(__cpu_to_be32(value), addr);
|
|
}
|
|
#endif
|
|
|
|
#ifndef ioread8_rep
|
|
#define ioread8_rep ioread8_rep
|
|
static inline void ioread8_rep(const volatile void __iomem *addr, void *buffer,
|
|
unsigned int count)
|
|
{
|
|
readsb(addr, buffer, count);
|
|
}
|
|
#endif
|
|
|
|
#ifndef ioread16_rep
|
|
#define ioread16_rep ioread16_rep
|
|
static inline void ioread16_rep(const volatile void __iomem *addr,
|
|
void *buffer, unsigned int count)
|
|
{
|
|
readsw(addr, buffer, count);
|
|
}
|
|
#endif
|
|
|
|
#ifndef ioread32_rep
|
|
#define ioread32_rep ioread32_rep
|
|
static inline void ioread32_rep(const volatile void __iomem *addr,
|
|
void *buffer, unsigned int count)
|
|
{
|
|
readsl(addr, buffer, count);
|
|
}
|
|
#endif
|
|
|
|
#ifndef iowrite8_rep
|
|
#define iowrite8_rep iowrite8_rep
|
|
static inline void iowrite8_rep(volatile void __iomem *addr,
|
|
const void *buffer,
|
|
unsigned int count)
|
|
{
|
|
writesb(addr, buffer, count);
|
|
}
|
|
#endif
|
|
|
|
#ifndef iowrite16_rep
|
|
#define iowrite16_rep iowrite16_rep
|
|
static inline void iowrite16_rep(volatile void __iomem *addr,
|
|
const void *buffer,
|
|
unsigned int count)
|
|
{
|
|
writesw(addr, buffer, count);
|
|
}
|
|
#endif
|
|
|
|
#ifndef iowrite32_rep
|
|
#define iowrite32_rep iowrite32_rep
|
|
static inline void iowrite32_rep(volatile void __iomem *addr,
|
|
const void *buffer,
|
|
unsigned int count)
|
|
{
|
|
writesl(addr, buffer, count);
|
|
}
|
|
#endif
|
|
#endif /* CONFIG_GENERIC_IOMAP */
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/vmalloc.h>
|
|
#define __io_virt(x) ((void __force *)(x))
|
|
|
|
#ifndef CONFIG_GENERIC_IOMAP
|
|
struct pci_dev;
|
|
extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
|
|
|
|
#ifndef pci_iounmap
|
|
#define pci_iounmap pci_iounmap
|
|
static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
|
|
{
|
|
}
|
|
#endif
|
|
#endif /* CONFIG_GENERIC_IOMAP */
|
|
|
|
/*
|
|
* Change virtual addresses to physical addresses and vv.
|
|
* These are pretty trivial
|
|
*/
|
|
#ifndef virt_to_phys
|
|
#define virt_to_phys virt_to_phys
|
|
static inline unsigned long virt_to_phys(volatile void *address)
|
|
{
|
|
return __pa((unsigned long)address);
|
|
}
|
|
#endif
|
|
|
|
#ifndef phys_to_virt
|
|
#define phys_to_virt phys_to_virt
|
|
static inline void *phys_to_virt(unsigned long address)
|
|
{
|
|
return __va(address);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Change "struct page" to physical address.
|
|
*
|
|
* This implementation is for the no-MMU case only... if you have an MMU
|
|
* you'll need to provide your own definitions.
|
|
*/
|
|
|
|
#ifndef CONFIG_MMU
|
|
#ifndef ioremap
|
|
#define ioremap ioremap
|
|
static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
|
|
{
|
|
return (void __iomem *)(unsigned long)offset;
|
|
}
|
|
#endif
|
|
|
|
#ifndef __ioremap
|
|
#define __ioremap __ioremap
|
|
static inline void __iomem *__ioremap(phys_addr_t offset, size_t size,
|
|
unsigned long flags)
|
|
{
|
|
return ioremap(offset, size);
|
|
}
|
|
#endif
|
|
|
|
#ifndef ioremap_nocache
|
|
#define ioremap_nocache ioremap_nocache
|
|
static inline void __iomem *ioremap_nocache(phys_addr_t offset, size_t size)
|
|
{
|
|
return ioremap(offset, size);
|
|
}
|
|
#endif
|
|
|
|
#ifndef ioremap_wc
|
|
#define ioremap_wc ioremap_wc
|
|
static inline void __iomem *ioremap_wc(phys_addr_t offset, size_t size)
|
|
{
|
|
return ioremap_nocache(offset, size);
|
|
}
|
|
#endif
|
|
|
|
#ifndef iounmap
|
|
#define iounmap iounmap
|
|
static inline void iounmap(void __iomem *addr)
|
|
{
|
|
}
|
|
#endif
|
|
#endif /* CONFIG_MMU */
|
|
|
|
#ifdef CONFIG_HAS_IOPORT_MAP
|
|
#ifndef CONFIG_GENERIC_IOMAP
|
|
#ifndef ioport_map
|
|
#define ioport_map ioport_map
|
|
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
|
|
{
|
|
return PCI_IOBASE + (port & IO_SPACE_LIMIT);
|
|
}
|
|
#endif
|
|
|
|
#ifndef ioport_unmap
|
|
#define ioport_unmap ioport_unmap
|
|
static inline void ioport_unmap(void __iomem *p)
|
|
{
|
|
}
|
|
#endif
|
|
#else /* CONFIG_GENERIC_IOMAP */
|
|
extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
|
|
extern void ioport_unmap(void __iomem *p);
|
|
#endif /* CONFIG_GENERIC_IOMAP */
|
|
#endif /* CONFIG_HAS_IOPORT_MAP */
|
|
|
|
#ifndef xlate_dev_kmem_ptr
|
|
#define xlate_dev_kmem_ptr xlate_dev_kmem_ptr
|
|
static inline void *xlate_dev_kmem_ptr(void *addr)
|
|
{
|
|
return addr;
|
|
}
|
|
#endif
|
|
|
|
#ifndef xlate_dev_mem_ptr
|
|
#define xlate_dev_mem_ptr xlate_dev_mem_ptr
|
|
static inline void *xlate_dev_mem_ptr(phys_addr_t addr)
|
|
{
|
|
return __va(addr);
|
|
}
|
|
#endif
|
|
|
|
#ifndef unxlate_dev_mem_ptr
|
|
#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
|
|
static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_VIRT_TO_BUS
|
|
#ifndef virt_to_bus
|
|
static inline unsigned long virt_to_bus(void *address)
|
|
{
|
|
return (unsigned long)address;
|
|
}
|
|
|
|
static inline void *bus_to_virt(unsigned long address)
|
|
{
|
|
return (void *)address;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef memset_io
|
|
#define memset_io memset_io
|
|
static inline void memset_io(volatile void __iomem *addr, int value,
|
|
size_t size)
|
|
{
|
|
memset(__io_virt(addr), value, size);
|
|
}
|
|
#endif
|
|
|
|
#ifndef memcpy_fromio
|
|
#define memcpy_fromio memcpy_fromio
|
|
static inline void memcpy_fromio(void *buffer,
|
|
const volatile void __iomem *addr,
|
|
size_t size)
|
|
{
|
|
memcpy(buffer, __io_virt(addr), size);
|
|
}
|
|
#endif
|
|
|
|
#ifndef memcpy_toio
|
|
#define memcpy_toio memcpy_toio
|
|
static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
|
|
size_t size)
|
|
{
|
|
memcpy(__io_virt(addr), buffer, size);
|
|
}
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __ASM_GENERIC_IO_H */
|