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Diffstat (limited to 'kernel/include/asm-generic/io.h')
| -rw-r--r-- | kernel/include/asm-generic/io.h | 877 |
1 files changed, 877 insertions, 0 deletions
diff --git a/kernel/include/asm-generic/io.h b/kernel/include/asm-generic/io.h new file mode 100644 index 000000000..9db042304 --- /dev/null +++ b/kernel/include/asm-generic/io.h @@ -0,0 +1,877 @@ +/* Generic I/O port emulation, based on MN10300 code + * + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#ifndef __ASM_GENERIC_IO_H +#define __ASM_GENERIC_IO_H + +#include <asm/page.h> /* I/O is all done through memory accesses */ +#include <linux/string.h> /* for memset() and memcpy() */ +#include <linux/types.h> + +#ifdef CONFIG_GENERIC_IOMAP +#include <asm-generic/iomap.h> +#endif + +#include <asm-generic/pci_iomap.h> + +#ifndef mmiowb +#define mmiowb() do {} while (0) +#endif + +/* + * __raw_{read,write}{b,w,l,q}() access memory in native endianness. + * + * On some architectures memory mapped IO needs to be accessed differently. + * On the simple architectures, we just read/write the memory location + * directly. + */ + +#ifndef __raw_readb +#define __raw_readb __raw_readb +static inline u8 __raw_readb(const volatile void __iomem *addr) +{ + return *(const volatile u8 __force *)addr; +} +#endif + +#ifndef __raw_readw +#define __raw_readw __raw_readw +static inline u16 __raw_readw(const volatile void __iomem *addr) +{ + return *(const volatile u16 __force *)addr; +} +#endif + +#ifndef __raw_readl +#define __raw_readl __raw_readl +static inline u32 __raw_readl(const volatile void __iomem *addr) +{ + return *(const volatile u32 __force *)addr; +} +#endif + +#ifdef CONFIG_64BIT +#ifndef __raw_readq +#define __raw_readq __raw_readq +static inline u64 __raw_readq(const volatile void __iomem *addr) +{ + return *(const volatile u64 __force *)addr; +} +#endif +#endif /* CONFIG_64BIT */ + +#ifndef __raw_writeb +#define __raw_writeb __raw_writeb +static inline void __raw_writeb(u8 value, volatile void __iomem *addr) +{ + *(volatile u8 __force *)addr = value; +} +#endif + +#ifndef __raw_writew +#define __raw_writew __raw_writew +static inline void __raw_writew(u16 value, volatile void __iomem *addr) +{ + *(volatile u16 __force *)addr = value; +} +#endif + +#ifndef __raw_writel +#define __raw_writel __raw_writel +static inline void __raw_writel(u32 value, volatile void __iomem *addr) +{ + *(volatile u32 __force *)addr = value; +} +#endif + +#ifdef CONFIG_64BIT +#ifndef __raw_writeq +#define __raw_writeq __raw_writeq +static inline void __raw_writeq(u64 value, volatile void __iomem *addr) +{ + *(volatile u64 __force *)addr = value; +} +#endif +#endif /* CONFIG_64BIT */ + +/* + * {read,write}{b,w,l,q}() access little endian memory and return result in + * native endianness. + */ + +#ifndef readb +#define readb readb +static inline u8 readb(const volatile void __iomem *addr) +{ + return __raw_readb(addr); +} +#endif + +#ifndef readw +#define readw readw +static inline u16 readw(const volatile void __iomem *addr) +{ + return __le16_to_cpu(__raw_readw(addr)); +} +#endif + +#ifndef readl +#define readl readl +static inline u32 readl(const volatile void __iomem *addr) +{ + return __le32_to_cpu(__raw_readl(addr)); +} +#endif + +#ifdef CONFIG_64BIT +#ifndef readq +#define readq readq +static inline u64 readq(const volatile void __iomem *addr) +{ + return __le64_to_cpu(__raw_readq(addr)); +} +#endif +#endif /* CONFIG_64BIT */ + +#ifndef writeb +#define writeb writeb +static inline void writeb(u8 value, volatile void __iomem *addr) +{ + __raw_writeb(value, addr); +} +#endif + +#ifndef writew +#define writew writew +static inline void writew(u16 value, volatile void __iomem *addr) +{ + __raw_writew(cpu_to_le16(value), addr); +} +#endif + +#ifndef writel +#define writel writel +static inline void writel(u32 value, volatile void __iomem *addr) +{ + __raw_writel(__cpu_to_le32(value), addr); +} +#endif + +#ifdef CONFIG_64BIT +#ifndef writeq +#define writeq writeq +static inline void writeq(u64 value, volatile void __iomem *addr) +{ + __raw_writeq(__cpu_to_le64(value), addr); +} +#endif +#endif /* CONFIG_64BIT */ + +/* + * {read,write}{b,w,l,q}_relaxed() are like the regular version, but + * are not guaranteed to provide ordering against spinlocks or memory + * accesses. + */ +#ifndef readb_relaxed +#define readb_relaxed readb +#endif + +#ifndef readw_relaxed +#define readw_relaxed readw +#endif + +#ifndef readl_relaxed +#define readl_relaxed readl +#endif + +#ifndef readq_relaxed +#define readq_relaxed readq +#endif + +#ifndef writeb_relaxed +#define writeb_relaxed writeb +#endif + +#ifndef writew_relaxed +#define writew_relaxed writew +#endif + +#ifndef writel_relaxed +#define writel_relaxed writel +#endif + +#ifndef writeq_relaxed +#define writeq_relaxed writeq +#endif + +/* + * {read,write}s{b,w,l,q}() repeatedly access the same memory address in + * native endianness in 8-, 16-, 32- or 64-bit chunks (@count times). + */ +#ifndef readsb +#define readsb readsb +static inline void readsb(const volatile void __iomem *addr, void *buffer, + unsigned int count) +{ + if (count) { + u8 *buf = buffer; + + do { + u8 x = __raw_readb(addr); + *buf++ = x; + } while (--count); + } +} +#endif + +#ifndef readsw +#define readsw readsw +static inline void readsw(const volatile void __iomem *addr, void *buffer, + unsigned int count) +{ + if (count) { + u16 *buf = buffer; + + do { + u16 x = __raw_readw(addr); + *buf++ = x; + } while (--count); + } +} +#endif + +#ifndef readsl +#define readsl readsl +static inline void readsl(const volatile void __iomem *addr, void *buffer, + unsigned int count) +{ + if (count) { + u32 *buf = buffer; + + do { + u32 x = __raw_readl(addr); + *buf++ = x; + } while (--count); + } +} +#endif + +#ifdef CONFIG_64BIT +#ifndef readsq +#define readsq readsq +static inline void readsq(const volatile void __iomem *addr, void *buffer, + unsigned int count) +{ + if (count) { + u64 *buf = buffer; + + do { + u64 x = __raw_readq(addr); + *buf++ = x; + } while (--count); + } +} +#endif +#endif /* CONFIG_64BIT */ + +#ifndef writesb +#define writesb writesb +static inline void writesb(volatile void __iomem *addr, const void *buffer, + unsigned int count) +{ + if (count) { + const u8 *buf = buffer; + + do { + __raw_writeb(*buf++, addr); + } while (--count); + } +} +#endif + +#ifndef writesw +#define writesw writesw +static inline void writesw(volatile void __iomem *addr, const void *buffer, + unsigned int count) +{ + if (count) { + const u16 *buf = buffer; + + do { + __raw_writew(*buf++, addr); + } while (--count); + } +} +#endif + +#ifndef writesl +#define writesl writesl +static inline void writesl(volatile void __iomem *addr, const void *buffer, + unsigned int count) +{ + if (count) { + const u32 *buf = buffer; + + do { + __raw_writel(*buf++, addr); + } while (--count); + } +} +#endif + +#ifdef CONFIG_64BIT +#ifndef writesq +#define writesq writesq +static inline void writesq(volatile void __iomem *addr, const void *buffer, + unsigned int count) +{ + if (count) { + const u64 *buf = buffer; + + do { + __raw_writeq(*buf++, addr); + } while (--count); + } +} +#endif +#endif /* CONFIG_64BIT */ + +#ifndef PCI_IOBASE +#define PCI_IOBASE ((void __iomem *)0) +#endif + +#ifndef IO_SPACE_LIMIT +#define IO_SPACE_LIMIT 0xffff +#endif + +/* + * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be + * implemented on hardware that needs an additional delay for I/O accesses to + * take effect. + */ + +#ifndef inb +#define inb inb +static inline u8 inb(unsigned long addr) +{ + return readb(PCI_IOBASE + addr); +} +#endif + +#ifndef inw +#define inw inw +static inline u16 inw(unsigned long addr) +{ + return readw(PCI_IOBASE + addr); +} +#endif + +#ifndef inl +#define inl inl +static inline u32 inl(unsigned long addr) +{ + return readl(PCI_IOBASE + addr); +} +#endif + +#ifndef outb +#define outb outb +static inline void outb(u8 value, unsigned long addr) +{ + writeb(value, PCI_IOBASE + addr); +} +#endif + +#ifndef outw +#define outw outw +static inline void outw(u16 value, unsigned long addr) +{ + writew(value, PCI_IOBASE + addr); +} +#endif + +#ifndef outl +#define outl outl +static inline void outl(u32 value, unsigned long addr) +{ + writel(value, PCI_IOBASE + addr); +} +#endif + +#ifndef inb_p +#define inb_p inb_p +static inline u8 inb_p(unsigned long addr) +{ + return inb(addr); +} +#endif + +#ifndef inw_p +#define inw_p inw_p +static inline u16 inw_p(unsigned long addr) +{ + return inw(addr); +} +#endif + +#ifndef inl_p +#define inl_p inl_p +static inline u32 inl_p(unsigned long addr) +{ + return inl(addr); +} +#endif + +#ifndef outb_p +#define outb_p outb_p +static inline void outb_p(u8 value, unsigned long addr) +{ + outb(value, addr); +} +#endif + +#ifndef outw_p +#define outw_p outw_p +static inline void outw_p(u16 value, unsigned long addr) +{ + outw(value, addr); +} +#endif + +#ifndef outl_p +#define outl_p outl_p +static inline void outl_p(u32 value, unsigned long addr) +{ + outl(value, addr); +} +#endif + +/* + * {in,out}s{b,w,l}{,_p}() are variants of the above that repeatedly access a + * single I/O port multiple times. + */ + +#ifndef insb +#define insb insb +static inline void insb(unsigned long addr, void *buffer, unsigned int count) +{ + readsb(PCI_IOBASE + addr, buffer, count); +} +#endif + +#ifndef insw +#define insw insw +static inline void insw(unsigned long addr, void *buffer, unsigned int count) +{ + readsw(PCI_IOBASE + addr, buffer, count); +} +#endif + +#ifndef insl +#define insl insl +static inline void insl(unsigned long addr, void *buffer, unsigned int count) +{ + readsl(PCI_IOBASE + addr, buffer, count); +} +#endif + +#ifndef outsb +#define outsb outsb +static inline void outsb(unsigned long addr, const void *buffer, + unsigned int count) +{ + writesb(PCI_IOBASE + addr, buffer, count); +} +#endif + +#ifndef outsw +#define outsw outsw +static inline void outsw(unsigned long addr, const void *buffer, + unsigned int count) +{ + writesw(PCI_IOBASE + addr, buffer, count); +} +#endif + +#ifndef outsl +#define outsl outsl +static inline void outsl(unsigned long addr, const void *buffer, + unsigned int count) +{ + writesl(PCI_IOBASE + addr, buffer, count); +} +#endif + +#ifndef insb_p +#define insb_p insb_p +static inline void insb_p(unsigned long addr, void *buffer, unsigned int count) +{ + insb(addr, buffer, count); +} +#endif + +#ifndef insw_p +#define insw_p insw_p +static inline void insw_p(unsigned long addr, void *buffer, unsigned int count) +{ + insw(addr, buffer, count); +} +#endif + +#ifndef insl_p +#define insl_p insl_p +static inline void insl_p(unsigned long addr, void *buffer, unsigned int count) +{ + insl(addr, buffer, count); +} +#endif + +#ifndef outsb_p +#define outsb_p outsb_p +static inline void outsb_p(unsigned long addr, const void *buffer, + unsigned int count) +{ + outsb(addr, buffer, count); +} +#endif + +#ifndef outsw_p +#define outsw_p outsw_p +static inline void outsw_p(unsigned long addr, const void *buffer, + unsigned int count) +{ + outsw(addr, buffer, count); +} +#endif + +#ifndef outsl_p +#define outsl_p outsl_p +static inline void outsl_p(unsigned long addr, const void *buffer, + unsigned int count) +{ + outsl(addr, buffer, count); +} +#endif + +#ifndef CONFIG_GENERIC_IOMAP +#ifndef ioread8 +#define ioread8 ioread8 +static inline u8 ioread8(const volatile void __iomem *addr) +{ + return readb(addr); +} +#endif + +#ifndef ioread16 +#define ioread16 ioread16 +static inline u16 ioread16(const volatile void __iomem *addr) +{ + return readw(addr); +} +#endif + +#ifndef ioread32 +#define ioread32 ioread32 +static inline u32 ioread32(const volatile void __iomem *addr) +{ + return readl(addr); +} +#endif + +#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 */ |