linux_kernel/include/asm-generic/io.h

/* 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 */

#ifndef insb
static inline void insb(unsigned long addr, void *buffer, int count)
{
	if (count) {
		u8 *buf = buffer;
		do {
			u8 x = __raw_readb(addr + PCI_IOBASE);
			*buf++ = x;
		} while (--count);
	}
}
#endif

#ifndef insw
static inline void insw(unsigned long addr, void *buffer, int count)
{
	if (count) {
		u16 *buf = buffer;
		do {
			u16 x = __raw_readw(addr + PCI_IOBASE);
			*buf++ = x;
		} while (--count);
	}
}
#endif

#ifndef insl
static inline void insl(unsigned long addr, void *buffer, int count)
{
	if (count) {
		u32 *buf = buffer;
		do {
			u32 x = __raw_readl(addr + PCI_IOBASE);
			*buf++ = x;
		} while (--count);
	}
}
#endif

#ifndef outsb
static inline void outsb(unsigned long addr, const void *buffer, int count)
{
	if (count) {
		const u8 *buf = buffer;
		do {
			__raw_writeb(*buf++, addr + PCI_IOBASE);
		} while (--count);
	}
}
#endif

#ifndef outsw
static inline void outsw(unsigned long addr, const void *buffer, int count)
{
	if (count) {
		const u16 *buf = buffer;
		do {
			__raw_writew(*buf++, addr + PCI_IOBASE);
		} while (--count);
	}
}
#endif

#ifndef outsl
static inline void outsl(unsigned long addr, const void *buffer, int count)
{
	if (count) {
		const u32 *buf = buffer;
		do {
			__raw_writel(*buf++, addr + PCI_IOBASE);
		} while (--count);
	}
}
#endif

#ifndef CONFIG_GENERIC_IOMAP
#define ioread8_rep(p, dst, count) \
	insb((unsigned long) (p), (dst), (count))
#define ioread16_rep(p, dst, count) \
	insw((unsigned long) (p), (dst), (count))
#define ioread32_rep(p, dst, count) \
	insl((unsigned long) (p), (dst), (count))

#define iowrite8_rep(p, src, count) \
	outsb((unsigned long) (p), (src), (count))
#define iowrite16_rep(p, src, count) \
	outsw((unsigned long) (p), (src), (count))
#define iowrite32_rep(p, src, count) \
	outsl((unsigned long) (p), (src), (count))
#endif /* CONFIG_GENERIC_IOMAP */

#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

#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
#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 */