io.h 1.74 KB
Newer Older
1
/*
2
 * include/asm-xtensa/io.h
3
4
5
6
7
8
9
10
11
12
13
14
15
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_IO_H
#define _XTENSA_IO_H

#ifdef __KERNEL__
#include <asm/byteorder.h>
16
#include <asm/page.h>
17
#include <linux/bug.h>
18
#include <linux/kernel.h>
19
20
21

#include <linux/types.h>

Chris Zankel's avatar
Chris Zankel committed
22
23
#define XCHAL_KIO_CACHED_VADDR	0xe0000000
#define XCHAL_KIO_BYPASS_VADDR	0xf0000000
24
#define XCHAL_KIO_PADDR		0xf0000000
Chris Zankel's avatar
Chris Zankel committed
25
26
27
#define XCHAL_KIO_SIZE		0x10000000

#define IOADDR(x)		(XCHAL_KIO_BYPASS_VADDR + (x))
28
#define IO_SPACE_LIMIT ~0
29

30
#ifdef CONFIG_MMU
31
/*
32
 * Return the virtual address for the specified bus memory.
33
 * Note that we currently don't support any address outside the KIO segment.
34
 */
Max Filippov's avatar
Max Filippov committed
35
36
static inline void __iomem *ioremap_nocache(unsigned long offset,
		unsigned long size)
37
{
38
	if (offset >= XCHAL_KIO_PADDR
Max Filippov's avatar
Max Filippov committed
39
	    && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
40
41
42
		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
	else
		BUG();
43
44
}

Max Filippov's avatar
Max Filippov committed
45
46
static inline void __iomem *ioremap_cache(unsigned long offset,
		unsigned long size)
47
{
48
	if (offset >= XCHAL_KIO_PADDR
Max Filippov's avatar
Max Filippov committed
49
	    && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
50
51
52
		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
	else
		BUG();
53
54
}

Max Filippov's avatar
Max Filippov committed
55
56
57
58
59
60
61
62
#define ioremap_wc ioremap_nocache

static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
{
	return ioremap_nocache(offset, size);
}

static inline void iounmap(volatile void __iomem *addr)
63
64
{
}
65
#endif /* CONFIG_MMU */
66
67
68
69

/*
 * Generic I/O
 */
70
71
72
#define readb_relaxed readb
#define readw_relaxed readw
#define readl_relaxed readl
73
74
75

#endif	/* __KERNEL__ */

76
77
#include <asm-generic/io.h>

78
#endif	/* _XTENSA_IO_H */