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
28extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size,
29			unsigned long cacheflag);
30extern void __iounmap(void __iomem *addr);
31
32static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
33{
34	return __ioremap(physaddr, size, 0);
35}
36
37static inline void __iomem *ioremap_nocache(unsigned long physaddr,
38						unsigned long size)
39{
40	return __ioremap(physaddr, size, 0);
41}
42
43static inline void iounmap(void __iomem *addr)
44{
45	__iounmap(addr);
46}
47
48#define ioremap_wc ioremap_nocache
49#define ioremap_wt ioremap_nocache
50
51/* Pages to physical address... */
52#define page_to_phys(page)	virt_to_phys(page_to_virt(page))
53#define page_to_bus(page)	page_to_virt(page)
54
55/* Macros used for converting between virtual and physical mappings. */
56#define phys_to_virt(vaddr)	\
57	((void *)((unsigned long)(vaddr) | CONFIG_NIOS2_KERNEL_REGION_BASE))
58/* Clear top 3 bits */
59#define virt_to_phys(vaddr)	\
60	((unsigned long)((unsigned long)(vaddr) & ~0xE0000000))
61
62#include <asm-generic/io.h>
63
64#endif /* _ASM_NIOS2_IO_H */