Linux kernel mirror (for testing)
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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 <linux/init.h>
23#include <asm/io.h>
24#include <asm/page.h>
25
26struct device;
27
28__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
29void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
30
31#ifdef CONFIG_MMU
32int ioremap_page_range(unsigned long addr, unsigned long end,
33 phys_addr_t phys_addr, pgprot_t prot);
34#else
35static inline int ioremap_page_range(unsigned long addr, unsigned long end,
36 phys_addr_t phys_addr, pgprot_t prot)
37{
38 return 0;
39}
40#endif
41
42#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
43void __init ioremap_huge_init(void);
44int arch_ioremap_pud_supported(void);
45int arch_ioremap_pmd_supported(void);
46#else
47static inline void ioremap_huge_init(void) { }
48#endif
49
50/*
51 * Managed iomap interface
52 */
53#ifdef CONFIG_HAS_IOPORT_MAP
54void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
55 unsigned int nr);
56void devm_ioport_unmap(struct device *dev, void __iomem *addr);
57#else
58static inline void __iomem *devm_ioport_map(struct device *dev,
59 unsigned long port,
60 unsigned int nr)
61{
62 return NULL;
63}
64
65static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
66{
67}
68#endif
69
70#define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
71
72void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
73 resource_size_t size);
74void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
75 resource_size_t size);
76void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
77 resource_size_t size);
78void devm_iounmap(struct device *dev, void __iomem *addr);
79int check_signature(const volatile void __iomem *io_addr,
80 const unsigned char *signature, int length);
81void devm_ioremap_release(struct device *dev, void *res);
82
83/*
84 * Some systems do not have legacy ISA devices.
85 * /dev/port is not a valid interface on these systems.
86 * So for those archs, <asm/io.h> should define the following symbol.
87 */
88#ifndef arch_has_dev_port
89#define arch_has_dev_port() (1)
90#endif
91
92/*
93 * Some systems (x86 without PAT) have a somewhat reliable way to mark a
94 * physical address range such that uncached mappings will actually
95 * end up write-combining. This facility should be used in conjunction
96 * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
97 * no effect if the per-page mechanisms are functional.
98 * (On x86 without PAT, these functions manipulate MTRRs.)
99 *
100 * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
101 * to have no effect.
102 */
103#ifndef arch_phys_wc_add
104static inline int __must_check arch_phys_wc_add(unsigned long base,
105 unsigned long size)
106{
107 return 0; /* It worked (i.e. did nothing). */
108}
109
110static inline void arch_phys_wc_del(int handle)
111{
112}
113
114#define arch_phys_wc_add arch_phys_wc_add
115#ifndef arch_phys_wc_index
116static inline int arch_phys_wc_index(int handle)
117{
118 return -1;
119}
120#define arch_phys_wc_index arch_phys_wc_index
121#endif
122#endif
123
124#endif /* _LINUX_IO_H */