io.h

 1/*
 2 * Copyright (C) 2014 Altera Corporation
 3 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
 4 * Copyright (C) 2004 Microtronix Datacom Ltd.
 5 *
 6 * This file is subject to the terms and conditions of the GNU General Public
 7 * License. See the file "COPYING" in the main directory of this archive
 8 * for more details.
 9 */
10
11#ifndef _ASM_NIOS2_IO_H
12#define _ASM_NIOS2_IO_H
13
14#include <linux/types.h>
15#include <asm/pgtable-bits.h>
16
17/* PCI is not supported in nios2, set this to 0. */
18#define IO_SPACE_LIMIT 0
19
20#define readb_relaxed(addr)	readb(addr)
21#define readw_relaxed(addr)	readw(addr)
22#define readl_relaxed(addr)	readl(addr)
23
24#define writeb_relaxed(x, addr)	writeb(x, addr)
25#define writew_relaxed(x, addr)	writew(x, addr)
26#define writel_relaxed(x, addr)	writel(x, addr)
27
28void __iomem *ioremap(unsigned long physaddr, unsigned long size);
29void iounmap(void __iomem *addr);
30
31/* Macros used for converting between virtual and physical mappings. */
32#define phys_to_virt(vaddr)	\
33	((void *)((unsigned long)(vaddr) | CONFIG_NIOS2_KERNEL_REGION_BASE))
34/* Clear top 3 bits */
35#define virt_to_phys(vaddr)	\
36	((unsigned long)((unsigned long)(vaddr) & ~0xE0000000))
37
38#include <asm-generic/io.h>
39
40#endif /* _ASM_NIOS2_IO_H */