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2 * Copyright (C) 2014 Altera Corporation
3 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
4 * Copyright (C) 2004 Microtronix Datacom Ltd.
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
11 #ifndef _ASM_NIOS2_IO_H
12 #define _ASM_NIOS2_IO_H
14 #include <asm/pgtable-bits.h>
16 /* PCI is not supported in nios2, set this to 0. */
17 #define IO_SPACE_LIMIT 0
19 #define readb_relaxed(addr) readb(addr)
20 #define readw_relaxed(addr) readw(addr)
21 #define readl_relaxed(addr) readl(addr)
23 #define writeb_relaxed(x, addr) writeb(x, addr)
24 #define writew_relaxed(x, addr) writew(x, addr)
25 #define writel_relaxed(x, addr) writel(x, addr)
27 #include <asm-generic/io.h>
29 extern void __iomem
*__ioremap(unsigned long physaddr
, unsigned long size
,
30 unsigned long cacheflag
);
31 extern void __iounmap(void __iomem
*addr
);
33 static inline void __iomem
*ioremap(unsigned long physaddr
, unsigned long size
)
35 return __ioremap(physaddr
, size
, 0);
38 static inline void __iomem
*ioremap_nocache(unsigned long physaddr
,
41 return __ioremap(physaddr
, size
, 0);
44 static inline void iounmap(void __iomem
*addr
)
49 /* Pages to physical address... */
50 #define page_to_phys(page) virt_to_phys(page_to_virt(page))
51 #define page_to_bus(page) page_to_virt(page)
53 /* Macros used for converting between virtual and physical mappings. */
54 #define phys_to_virt(vaddr) \
55 ((void *)((unsigned long)(vaddr) | CONFIG_NIOS2_KERNEL_REGION_BASE))
56 /* Clear top 3 bits */
57 #define virt_to_phys(vaddr) \
58 ((unsigned long)((unsigned long)(vaddr) & ~0xE0000000))
60 #endif /* _ASM_NIOS2_IO_H */