io.h

这是华恒s3c2410里面的内核函数的代码中的比较重要的一部份

/*
 * linux/include/asm-arm/arch-s3c2400/io.h
 *
 * Copyright (C) 2001 MIZI Research, Inc.
 *
 * 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 program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * Histroy
 *
 * 2001-12-14: Janghoon Lyu <[e-mail]>
 *    - Initial code
 *    - Based on linux/include/asm-arm/arch-sa100/io.h
 *
 * 2002-03-07: Yong-iL Joh <[e-mail]>
 *    - 内靛府轰 沁澜
 *    - __io(), __mem_pci(), __mem_isa()甫 瘤框
 *    - DO_NOT_USE_IO_PORT甫 眠啊窍绊, drivers/char/mem.c甫 荐沥
 *
 * 2002-03-09: Janghoon Lyu <[e-mail]>
 *    - 促矫 盔贰措肺 倒覆
 *    - mem.c甫 荐沥秦具 登绰霸 钦府利捞瘤 臼篮 巴 鞍酒辑.
 *    - S3C2400苞 包访等 巴阑 力寇茄 促弗 目澄 内靛俊 荐沥阑 啊窍绰
 *      巴篮 亮瘤 臼促绊 积阿捞 凳.
 */

#ifndef __ASM_ARM_ARCH_IO_H
#define __ASM_ARM_ARCH_IO_H

#define IO_SPACE_LIMIT 0xffffffff

/*
 * We don't actually have real ISA nor PCI buses, but there is so many
 * drivers out there that might just work if we fake them...
 */
#define __io(a)		(PCIO_BASE + (a))
#define __mem_pci(a)	((unsigned long)(a))
#define __mem_isa(a)	((unsigned long)(a))

/*
 * Generic virtual read/write
 */
#define __arch_getw(a)			(*(volatile unsigned short *)(a))
#define __arch_putw(v,a)		(*(volatile unsigned short *)(a) = (v))

#define iomem_valid_addr(iomem,sz)	(1)
#define iomem_to_phys(iomem)		(iomem)

#endif /* __ASM_ARM_ARCH_IO_H */