port.c

ARM开发实例emed linuxexamples.tar.gz

#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include "../../include/directio.h"

static int fd = -1;

int port_init()
{
        fd=open("/dev/directio",O_NONBLOCK,0);
        if(fd<0)
        {
                printf("Can't open directio device\n");
                return -1;
        }
	return 0;
}

unsigned char port_inb(unsigned int port)
{
        struct port_data data;

        data.cmd       = CMD_PORT;
        data.startaddr = port;
        data.nums      = 1;
        data.opts      = PORT_BYTE;
        ioctl(fd, IOCTL_GET_MSG, &data);

	return data.value;
}

unsigned short port_inw(unsigned int port)
{
        struct port_data data;

        data.cmd       = CMD_PORT;
 	data.startaddr = port;
 	data.nums      = 2;
       	data.opts      = PORT_HWORD;
 	ioctl(fd, IOCTL_GET_MSG, &data);

	return data.value;
}

unsigned int port_inl(unsigned int port)
{
	struct port_data data;

	data.cmd       = CMD_PORT;
        data.startaddr = port;
        data.nums      = 4;
        data.opts      = PORT_WORD;
        ioctl(fd, IOCTL_GET_MSG, &data);

        return data.value;
}

int port_outb(unsigned int port, unsigned char value)
{
        struct port_data data;

        data.cmd       = CMD_PORT;
        data.startaddr = port;
        data.nums      = 1;
        data.opts      = PORT_BYTE;
        data.value     = value;
        ioctl(fd, IOCTL_SET_MSG, &data);
}

int port_outw(unsigned int port, unsigned short value)
{
        struct port_data data;

        data.cmd       = CMD_PORT;
        data.startaddr = port;
        data.nums      = 2;
        data.opts      = PORT_HWORD;
        data.value     = value;
        ioctl(fd, IOCTL_SET_MSG, &data);
}

int port_outl(unsigned int port, unsigned int value)
{
	struct port_data data;
	
        data.cmd       = CMD_PORT;
	data.startaddr = port;
	data.nums      = 4;
	data.opts      = PORT_WORD;
	data.value     = value;
	ioctl(fd, IOCTL_SET_MSG, &data);
}

void port_uninit()
{
	if(fd >= 0)
		close(fd);
}