summaryrefslogtreecommitdiffstats
path: root/arch/xtensa/include/asm/io.h
blob: 867840f5400f4d2d584505682bf089c7cfe694cc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
/*
 * include/asm-xtensa/io.h
 *
 * 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>
#include <asm/page.h>
#include <asm/vectors.h>
#include <linux/bug.h>
#include <linux/kernel.h>

#include <linux/types.h>

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

#ifdef CONFIG_MMU

#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && defined(CONFIG_OF)
extern unsigned long xtensa_kio_paddr;

static inline unsigned long xtensa_get_kio_paddr(void)
{
	return xtensa_kio_paddr;
}
#endif

/*
 * Return the virtual address for the specified bus memory.
 * Note that we currently don't support any address outside the KIO segment.
 */
static inline void __iomem *ioremap_nocache(unsigned long offset,
		unsigned long size)
{
	if (offset >= XCHAL_KIO_PADDR
	    && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
	else
		BUG();
}

static inline void __iomem *ioremap_cache(unsigned long offset,
		unsigned long size)
{
	if (offset >= XCHAL_KIO_PADDR
	    && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
	else
		BUG();
}
#define ioremap_cache ioremap_cache

#define ioremap_wc ioremap_nocache
#define ioremap_wt 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)
{
}

#define virt_to_bus     virt_to_phys
#define bus_to_virt     phys_to_virt

#endif /* CONFIG_MMU */

#endif	/* __KERNEL__ */

#include <asm-generic/io.h>

#endif	/* _XTENSA_IO_H */
OpenPOWER on IntegriCloud