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Linux kernel mirror (for testing)
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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#include <asm/byteorder.h>
15#include <asm/page.h>
16#include <asm/vectors.h>
17#include <linux/bug.h>
18#include <linux/kernel.h>
19
20#include <linux/types.h>
21
22#define IOADDR(x) (XCHAL_KIO_BYPASS_VADDR + (x))
23#define IO_SPACE_LIMIT ~0
24
25#ifdef CONFIG_MMU
26
27void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size);
28void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size);
29void xtensa_iounmap(volatile void __iomem *addr);
30
31/*
32 * Return the virtual address for the specified bus memory.
33 */
34static inline void __iomem *ioremap_nocache(unsigned long offset,
35 unsigned long size)
36{
37 if (offset >= XCHAL_KIO_PADDR
38 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
39 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
40 else
41 return xtensa_ioremap_nocache(offset, size);
42}
43
44static inline void __iomem *ioremap_cache(unsigned long offset,
45 unsigned long size)
46{
47 if (offset >= XCHAL_KIO_PADDR
48 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
49 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
50 else
51 return xtensa_ioremap_cache(offset, size);
52}
53#define ioremap_cache ioremap_cache
54#define ioremap_nocache ioremap_nocache
55
56#define ioremap_wc ioremap_nocache
57#define ioremap_wt ioremap_nocache
58
59static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
60{
61 return ioremap_nocache(offset, size);
62}
63
64static inline void iounmap(volatile void __iomem *addr)
65{
66 unsigned long va = (unsigned long) addr;
67
68 if (!(va >= XCHAL_KIO_CACHED_VADDR &&
69 va - XCHAL_KIO_CACHED_VADDR < XCHAL_KIO_SIZE) &&
70 !(va >= XCHAL_KIO_BYPASS_VADDR &&
71 va - XCHAL_KIO_BYPASS_VADDR < XCHAL_KIO_SIZE))
72 xtensa_iounmap(addr);
73}
74
75#define virt_to_bus virt_to_phys
76#define bus_to_virt phys_to_virt
77
78#endif /* CONFIG_MMU */
79
80#include <asm-generic/io.h>
81
82#endif /* _XTENSA_IO_H */