barebox/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/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

#define readb __raw_readb
#define readw(addr) __le16_to_cpu(__raw_readw(addr))
#define readl(addr) __le32_to_cpu(__raw_readl(addr))

#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

#define writeb __raw_writeb
#define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
#define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)

#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

/*****************************************************************************/
/*
 * traditional input/output functions
 */

static inline u8 inb(unsigned long addr)
{
	return readb(addr + PCI_IOBASE);
}

static inline u16 inw(unsigned long addr)
{
	return readw(addr + PCI_IOBASE);
}

static inline u32 inl(unsigned long addr)
{
	return readl(addr + PCI_IOBASE);
}

static inline void outb(u8 b, unsigned long addr)
{
	writeb(b, addr + PCI_IOBASE);
}

static inline void outw(u16 b, unsigned long addr)
{
	writew(b, addr + PCI_IOBASE);
}

static inline void outl(u32 b, unsigned long addr)
{
	writel(b, addr + PCI_IOBASE);
}

#define inb_p(addr)	inb(addr)
#define inw_p(addr)	inw(addr)
#define inl_p(addr)	inl(addr)
#define outb_p(x, addr)	outb((x), (addr))
#define outw_p(x, addr)	outw((x), (addr))
#define outl_p(x, addr)	outl((x), (addr))

#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);
}

#define ioread8(addr)		readb(addr)
#define ioread16(addr)		readw(addr)
#define ioread16be(addr)	__be16_to_cpu(__raw_readw(addr))
#define ioread32(addr)		readl(addr)
#define ioread32be(addr)	__be32_to_cpu(__raw_readl(addr))

#define iowrite8(v, addr)	writeb((v), (addr))
#define iowrite16(v, addr)	writew((v), (addr))
#define iowrite16be(v, addr)	__raw_writew(__cpu_to_be16(v), addr)
#define iowrite32(v, addr)	writel((v), (addr))
#define iowrite32be(v, addr)	__raw_writel(__cpu_to_be32(v), addr)

#endif /* __ASM_GENERIC_IO_H */