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 <linux/bug.h>
24#include <linux/err.h>
25#include <asm/io.h>
26#include <asm/page.h>
27
28struct device;
29struct resource;
30
31__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
32void __ioread32_copy(void *to, const void __iomem *from, size_t count);
33void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
34
35#ifdef CONFIG_MMU
36int ioremap_page_range(unsigned long addr, unsigned long end,
37 phys_addr_t phys_addr, pgprot_t prot);
38#else
39static inline int ioremap_page_range(unsigned long addr, unsigned long end,
40 phys_addr_t phys_addr, pgprot_t prot)
41{
42 return 0;
43}
44#endif
45
46#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
47void __init ioremap_huge_init(void);
48int arch_ioremap_pud_supported(void);
49int arch_ioremap_pmd_supported(void);
50#else
51static inline void ioremap_huge_init(void) { }
52#endif
53
54/*
55 * Managed iomap interface
56 */
57#ifdef CONFIG_HAS_IOPORT_MAP
58void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
59 unsigned int nr);
60void devm_ioport_unmap(struct device *dev, void __iomem *addr);
61#else
62static inline void __iomem *devm_ioport_map(struct device *dev,
63 unsigned long port,
64 unsigned int nr)
65{
66 return NULL;
67}
68
69static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
70{
71}
72#endif
73
74#define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
75
76void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
77 resource_size_t size);
78void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
79 resource_size_t size);
80void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
81 resource_size_t size);
82void devm_iounmap(struct device *dev, void __iomem *addr);
83int check_signature(const volatile void __iomem *io_addr,
84 const unsigned char *signature, int length);
85void devm_ioremap_release(struct device *dev, void *res);
86
87void *devm_memremap(struct device *dev, resource_size_t offset,
88 size_t size, unsigned long flags);
89void devm_memunmap(struct device *dev, void *addr);
90
91void *__devm_memremap_pages(struct device *dev, struct resource *res);
92
93/*
94 * Some systems do not have legacy ISA devices.
95 * /dev/port is not a valid interface on these systems.
96 * So for those archs, <asm/io.h> should define the following symbol.
97 */
98#ifndef arch_has_dev_port
99#define arch_has_dev_port() (1)
100#endif
101
102/*
103 * Some systems (x86 without PAT) have a somewhat reliable way to mark a
104 * physical address range such that uncached mappings will actually
105 * end up write-combining. This facility should be used in conjunction
106 * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
107 * no effect if the per-page mechanisms are functional.
108 * (On x86 without PAT, these functions manipulate MTRRs.)
109 *
110 * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
111 * to have no effect.
112 */
113#ifndef arch_phys_wc_add
114static inline int __must_check arch_phys_wc_add(unsigned long base,
115 unsigned long size)
116{
117 return 0; /* It worked (i.e. did nothing). */
118}
119
120static inline void arch_phys_wc_del(int handle)
121{
122}
123
124#define arch_phys_wc_add arch_phys_wc_add
125#ifndef arch_phys_wc_index
126static inline int arch_phys_wc_index(int handle)
127{
128 return -1;
129}
130#define arch_phys_wc_index arch_phys_wc_index
131#endif
132#endif
133
134enum {
135 /* See memremap() kernel-doc for usage description... */
136 MEMREMAP_WB = 1 << 0,
137 MEMREMAP_WT = 1 << 1,
138 MEMREMAP_WC = 1 << 2,
139};
140
141void *memremap(resource_size_t offset, size_t size, unsigned long flags);
142void memunmap(void *addr);
143
144/*
145 * On x86 PAT systems we have memory tracking that keeps track of
146 * the allowed mappings on memory ranges. This tracking works for
147 * all the in-kernel mapping APIs (ioremap*), but where the user
148 * wishes to map a range from a physical device into user memory
149 * the tracking won't be updated. This API is to be used by
150 * drivers which remap physical device pages into userspace,
151 * and wants to make sure they are mapped WC and not UC.
152 */
153#ifndef arch_io_reserve_memtype_wc
154static inline int arch_io_reserve_memtype_wc(resource_size_t base,
155 resource_size_t size)
156{
157 return 0;
158}
159
160static inline void arch_io_free_memtype_wc(resource_size_t base,
161 resource_size_t size)
162{
163}
164#endif
165
166#endif /* _LINUX_IO_H */