source: trunk/softs/tsar_boot/include/io.h @ 655

/**
 * \file        io.h
 * \date        5 September 2012
 * \author      Cesar Fuguet
 *
 * Utility functions to write or read memory mapped hardware registers
 */
#ifndef IO_H
#define IO_H

/**
 * Read an 32 bits memory mapped hardware register
 */
static inline unsigned int ioread32(void * addr)
{
        return *(volatile unsigned int *) addr;
}

/**
 * Read an 16 bits memory mapped hardware register
 */
static inline unsigned short ioread16(void * addr)
{
        return *(volatile unsigned short *) addr;
}

/**
 * Read an 8 bits memory mapped hardware register
 */
static inline unsigned char ioread8(void * addr)
{
        return *(volatile unsigned char *) addr;
}

/**
 * Write an 32 bits memory mapped hardware register
 */
static inline void iowrite32(void * addr, unsigned int value)
{
        *(volatile unsigned int *) addr = value;
        asm volatile("sync" ::: "memory");
}

/**
 * Write an 16 bits memory mapped hardware register
 */
static inline void iowrite16(void * addr, unsigned short value)
{
        *(volatile unsigned short *) addr = value;
        asm volatile("sync" ::: "memory");
}

/**
 * Write an 8 bits memory mapped hardware register
 */
static inline void iowrite8(void * addr, unsigned char value)
{
        *(volatile unsigned char *) addr = value;
        asm volatile("sync" ::: "memory");
}

#endif