Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright 2006 PathScale, Inc. All Rights Reserved.
3 *
4 * This file is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
16 */
17
18#ifndef _LINUX_IO_H
19#define _LINUX_IO_H
20
21#include <linux/types.h>
22#include <asm/io.h>
23#include <asm/page.h>
24
25struct device;
26
27__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
28void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
29
30#ifdef CONFIG_MMU
31int ioremap_page_range(unsigned long addr, unsigned long end,
32 phys_addr_t phys_addr, pgprot_t prot);
33#else
34static inline int ioremap_page_range(unsigned long addr, unsigned long end,
35 phys_addr_t phys_addr, pgprot_t prot)
36{
37 return 0;
38}
39#endif
40
41/*
42 * Managed iomap interface
43 */
44#ifdef CONFIG_HAS_IOPORT_MAP
45void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
46 unsigned int nr);
47void devm_ioport_unmap(struct device *dev, void __iomem *addr);
48#else
49static inline void __iomem *devm_ioport_map(struct device *dev,
50 unsigned long port,
51 unsigned int nr)
52{
53 return NULL;
54}
55
56static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
57{
58}
59#endif
60
61#define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
62
63void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
64 resource_size_t size);
65void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
66 resource_size_t size);
67void devm_iounmap(struct device *dev, void __iomem *addr);
68int check_signature(const volatile void __iomem *io_addr,
69 const unsigned char *signature, int length);
70void devm_ioremap_release(struct device *dev, void *res);
71
72/*
73 * Some systems do not have legacy ISA devices.
74 * /dev/port is not a valid interface on these systems.
75 * So for those archs, <asm/io.h> should define the following symbol.
76 */
77#ifndef arch_has_dev_port
78#define arch_has_dev_port() (1)
79#endif
80
81/*
82 * Some systems (x86 without PAT) have a somewhat reliable way to mark a
83 * physical address range such that uncached mappings will actually
84 * end up write-combining. This facility should be used in conjunction
85 * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
86 * no effect if the per-page mechanisms are functional.
87 * (On x86 without PAT, these functions manipulate MTRRs.)
88 *
89 * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
90 * to have no effect.
91 */
92#ifndef arch_phys_wc_add
93static inline int __must_check arch_phys_wc_add(unsigned long base,
94 unsigned long size)
95{
96 return 0; /* It worked (i.e. did nothing). */
97}
98
99static inline void arch_phys_wc_del(int handle)
100{
101}
102
103#define arch_phys_wc_add arch_phys_wc_add
104#endif
105
106#endif /* _LINUX_IO_H */