xref: /linux/arch/nios2/include/asm/io.h (revision b85d45947951d23cb22d90caecf4c1eb81342c96)
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 
32 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
33 {
34 	return __ioremap(physaddr, size, 0);
35 }
36 
37 static inline void __iomem *ioremap_nocache(unsigned long physaddr,
38 						unsigned long size)
39 {
40 	return __ioremap(physaddr, size, 0);
41 }
42 
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 #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 */
65