path: root/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 <linux/string.h> /* for memset() and memcpy() */
#include <linux/types.h>
#include <asm/byteorder.h>

/*****************************************************************************/
/*
 * readX/writeX() are used to access memory mapped devices. On some
 * architectures the memory mapped IO stuff needs to be accessed
 * differently. On the simple architectures, we just read/write the
 * memory location directly.
 */

#ifndef __raw_readb
#define __raw_readb(a)		(__chk_io_ptr(a), *(volatile unsigned char __force  *)(a))
#endif

#ifndef __raw_readw
#define __raw_readw(a)		(__chk_io_ptr(a), *(volatile unsigned short __force *)(a))
#endif

#ifndef __raw_readl
#define __raw_readl(a)		(__chk_io_ptr(a), *(volatile unsigned int __force   *)(a))
#endif

#ifndef readb
#define readb __raw_readb
#endif

#ifndef readw
#define readw(addr) __le16_to_cpu(__raw_readw(addr))
#endif

#ifndef readl
#define readl(addr) __le32_to_cpu(__raw_readl(addr))
#endif

#ifndef __raw_writeb
#define __raw_writeb(v,a)	(__chk_io_ptr(a), *(volatile unsigned char __force  *)(a) = (v))
#endif

#ifndef __raw_writew
#define __raw_writew(v,a)	(__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v))
#endif

#ifndef __raw_writel
#define __raw_writel(v,a)	(__chk_io_ptr(a), *(volatile unsigned int __force   *)(a) = (v))
#endif

#ifndef writeb
#define writeb __raw_writeb
#endif

#ifndef writew
#define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
#endif

#ifndef writel
#define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
#endif

#ifdef CONFIG_64BIT
static inline u64 __raw_readq(const volatile void __iomem *addr)
{
	return *(const volatile u64 __force *) addr;
}
#define readq(addr) __le64_to_cpu(__raw_readq(addr))

static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
{
	*(volatile u64 __force *) addr = b;
}
#define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
#endif

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

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

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

static inline void readsl(const void __iomem *addr, void *buf, int len)
{
	insl(addr - PCI_IOBASE, buf, len);
}

static inline void readsw(const void __iomem *addr, void *buf, int len)
{
	insw(addr - PCI_IOBASE, buf, len);
}

static inline void readsb(const void __iomem *addr, void *buf, int len)
{
	insb(addr - PCI_IOBASE, buf, len);
}

static inline void writesl(const void __iomem *addr, const void *buf, int len)
{
	outsl(addr - PCI_IOBASE, buf, len);
}

static inline void writesw(const void __iomem *addr, const void *buf, int len)
{
	outsw(addr - PCI_IOBASE, buf, len);
}

static inline void writesb(const void __iomem *addr, const void *buf, int len)
{
	outsb(addr - PCI_IOBASE, buf, len);
}


#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

#ifdef CONFIG_64BIT
#ifndef ioread64
#define ioread64 ioread64
static inline u64 ioread64(const volatile void __iomem *addr)
{
	return readq(addr);
}
#endif
#endif /* CONFIG_64BIT */

#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

#ifdef CONFIG_64BIT
#ifndef iowrite64
#define iowrite64 iowrite64
static inline void iowrite64(u64 value, volatile void __iomem *addr)
{
	writeq(value, addr);
}
#endif
#endif /* CONFIG_64BIT */

#ifndef ioread16be
#define ioread16be ioread16be
static inline u16 ioread16be(const volatile void __iomem *addr)
{
	return swab16(readw(addr));
}
#endif

#ifndef ioread32be
#define ioread32be ioread32be
static inline u32 ioread32be(const volatile void __iomem *addr)
{
	return swab32(readl(addr));
}
#endif

#ifdef CONFIG_64BIT
#ifndef ioread64be
#define ioread64be ioread64be
static inline u64 ioread64be(const volatile void __iomem *addr)
{
	return swab64(readq(addr));
}
#endif
#endif /* CONFIG_64BIT */

#ifndef iowrite16be
#define iowrite16be iowrite16be
static inline void iowrite16be(u16 value, void volatile __iomem *addr)
{
	writew(swab16(value), addr);
}
#endif

#ifndef iowrite32be
#define iowrite32be iowrite32be
static inline void iowrite32be(u32 value, volatile void __iomem *addr)
{
	writel(swab32(value), addr);
}
#endif

#ifdef CONFIG_64BIT
#ifndef iowrite64be
#define iowrite64be iowrite64be
static inline void iowrite64be(u64 value, volatile void __iomem *addr)
{
	writeq(swab64(value), addr);
}
#endif
#endif /* CONFIG_64BIT */

#ifndef IOMEM
#define IOMEM(addr)	((void __force __iomem *)(addr))
#endif

#define __io_virt(x) ((void __force *)(x))

#ifndef memset_io
#define memset_io memset_io
/**
 * memset_io	Set a range of I/O memory to a constant value
 * @addr:	The beginning of the I/O-memory range to set
 * @val:	The value to set the memory to
 * @count:	The number of bytes to set
 *
 * Set a range of I/O memory to a given value.
 */
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
/**
 * memcpy_fromio	Copy a block of data from I/O memory
 * @dst:		The (RAM) destination for the copy
 * @src:		The (I/O memory) source for the data
 * @count:		The number of bytes to copy
 *
 * Copy a block of data from I/O memory.
 */
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
/**
 * memcpy_toio		Copy a block of data into I/O memory
 * @dst:		The (I/O memory) destination for the copy
 * @src:		The (RAM) source for the data
 * @count:		The number of bytes to copy
 *
 * Copy a block of data to I/O memory.
 */
static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
			       size_t size)
{
	memcpy(__io_virt(addr), buffer, size);
}
#endif

#endif /* __ASM_GENERIC_IO_H */