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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * include/asm-xtensa/io.h
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
9 */
10
11#ifndef _XTENSA_IO_H
12#define _XTENSA_IO_H
13
14#ifdef __KERNEL__
15#include <asm/byteorder.h>
16#include <asm/page.h>
17#include <asm/vectors.h>
18#include <linux/bug.h>
19#include <linux/kernel.h>
20
21#include <linux/types.h>
22
23#define IOADDR(x) (XCHAL_KIO_BYPASS_VADDR + (x))
24#define IO_SPACE_LIMIT ~0
25
26#ifdef CONFIG_MMU
27
28void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size);
29void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size);
30void xtensa_iounmap(volatile void __iomem *addr);
31
32/*
33 * Return the virtual address for the specified bus memory.
34 */
35static inline void __iomem *ioremap_nocache(unsigned long offset,
36 unsigned long size)
37{
38 if (offset >= XCHAL_KIO_PADDR
39 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
40 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
41 else
42 return xtensa_ioremap_nocache(offset, size);
43}
44
45static inline void __iomem *ioremap_cache(unsigned long offset,
46 unsigned long size)
47{
48 if (offset >= XCHAL_KIO_PADDR
49 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
50 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
51 else
52 return xtensa_ioremap_cache(offset, size);
53}
54#define ioremap_cache ioremap_cache
55#define ioremap_nocache ioremap_nocache
56
57#define ioremap_wc ioremap_nocache
58#define ioremap_wt ioremap_nocache
59
60static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
61{
62 return ioremap_nocache(offset, size);
63}
64
65static inline void iounmap(volatile void __iomem *addr)
66{
67 unsigned long va = (unsigned long) addr;
68
69 if (!(va >= XCHAL_KIO_CACHED_VADDR &&
70 va - XCHAL_KIO_CACHED_VADDR < XCHAL_KIO_SIZE) &&
71 !(va >= XCHAL_KIO_BYPASS_VADDR &&
72 va - XCHAL_KIO_BYPASS_VADDR < XCHAL_KIO_SIZE))
73 xtensa_iounmap(addr);
74}
75
76#define virt_to_bus virt_to_phys
77#define bus_to_virt phys_to_virt
78
79#endif /* CONFIG_MMU */
80
81#endif /* __KERNEL__ */
82
83#include <asm-generic/io.h>
84
85#endif /* _XTENSA_IO_H */