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