io.c

来自「microwindows移植到S3C44B0的源码」· C语言 代码 · 共 66 行

/*
 *  linux/arch/armnommu/mach-atmel/io.c
 *
 * BRIEF MODULE DESCRIPTION
 *   io functions
 *
 * Copyright (C) 2001 RidgeRun, Inc. (http://www.ridgerun.com)
 * Author: RidgeRun, Inc.
 *         Greg Lonnon ([e-mail]) or [e-mail]
 *
 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/kernel.h>
#include <asm/io.h>


#define __MEM_OFF(x) ((u32)x + CONFIG_MEM8_BASE)

/*
 * read[bwl] and write[bwl]
 */
u8 __readb(void *addr)
{
  return __arch_getb(__MEM_OFF(addr));
}

u16 __readw(void *addr)
{
  return __arch_getw(__MEM_OFF(addr));
}

u32 __readl(void *addr)
{
  return __arch_getl(__MEM_OFF(addr));
}

void __writeb(u8 val, void *addr)
{
	__arch_putb(val, __MEM_OFF(addr));
}

void __writew(u16 val, void *addr)
{
	__arch_putw(val, __MEM_OFF(addr));
}