/* io.h: FRV I/O operations
 *
 * Copyright (C) 2004 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 License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * This gets interesting when talking to the PCI bus - the CPU is in big endian
 * mode, the PCI bus is little endian and the hardware in the middle can do
 * byte swapping
 */
#ifndef _ASM_IO_H
#define _ASM_IO_H

#ifdef __KERNEL__

#include <linux/types.h>
#include <asm/virtconvert.h>
#include <asm/string.h>
#include <asm/mb-regs.h>
#include <asm-generic/pci_iomap.h>
#include <linux/delay.h>

/*
 * swap functions are sometimes needed to interface little-endian hardware
 */

static inline unsigned short _swapw(unsigned short v)
{
    return ((v << 8) | (v >> 8));
}

static inline unsigned long _swapl(unsigned long v)
{
    return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
}

//#define __iormb() asm volatile("membar")
//#define __iowmb() asm volatile("membar")

#define __raw_readb __builtin_read8
#define __raw_readw __builtin_read16
#define __raw_readl __builtin_read32

#define __raw_writeb(datum, addr) __builtin_write8(addr, datum)
#define __raw_writew(datum, addr) __builtin_write16(addr, datum)
#define __raw_writel(datum, addr) __builtin_write32(addr, datum)

static inline void io_outsb(unsigned int addr, const void *buf, int len)
{
	unsigned long __ioaddr = (unsigned long) addr;
	const uint8_t *bp = buf;

	while (len--)
		__builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
}

static inline void io_outsw(unsigned int addr, const void *buf, int len)
{
	unsigned long __ioaddr = (unsigned long) addr;
	const uint16_t *bp = buf;

	while (len--)
		__builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
}

extern void __outsl_ns(unsigned int addr, const void *buf, int len);
extern void __outsl_sw(unsigned int addr, const void *buf, int len);
static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
{
	unsigned long __ioaddr = (unsigned long) addr;

	if (!swap)
		__outsl_ns(__ioaddr, buf, len);
	else
		__outsl_sw(__ioaddr, buf, len);
}

static inline void io_insb(unsigned long addr, void *buf, int len)
{
	uint8_t *bp = buf;

	while (len--)
		*bp++ = __builtin_read8((volatile void __iomem *) addr);
}

static inline void io_insw(unsigned long addr, void *buf, int len)
{
	uint16_t *bp = buf;

	while (len--)
		*bp++ = __builtin_read16((volatile void __iomem *) addr);
}