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 | |
28 | struct device; |
29 | struct resource; |
30 | |
31 | __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count); |
32 | void __ioread32_copy(void *to, const void __iomem *from, size_t count); |
33 | void __iowrite64_copy(void __iomem *to, const void *from, size_t count); |
34 | |
35 | #ifdef CONFIG_MMU |
36 | int ioremap_page_range(unsigned long addr, unsigned long end, |
37 | phys_addr_t phys_addr, pgprot_t prot); |
38 | #else |
39 | static 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 |
47 | void __init ioremap_huge_init(void); |
48 | int arch_ioremap_pud_supported(void); |
49 | int arch_ioremap_pmd_supported(void); |
50 | #else |
51 | static inline void ioremap_huge_init(void) { } |
52 | #endif |
53 | |
54 | /* |
55 | * Managed iomap interface |
56 | */ |
57 | #ifdef CONFIG_HAS_IOPORT_MAP |
58 | void __iomem * devm_ioport_map(struct device *dev, unsigned long port, |
59 | unsigned int nr); |
60 | void devm_ioport_unmap(struct device *dev, void __iomem *addr); |
61 | #else |
62 | static inline void __iomem *devm_ioport_map(struct device *dev, |
63 | unsigned long port, |
64 | unsigned int nr) |
65 | { |
66 | return NULL; |
67 | } |
68 | |
69 | static 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 | |
76 | void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, |
77 | resource_size_t size); |
78 | void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset, |
79 | resource_size_t size); |
80 | void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, |
81 | resource_size_t size); |
82 | void devm_iounmap(struct device *dev, void __iomem *addr); |
83 | int check_signature(const volatile void __iomem *io_addr, |
84 | const unsigned char *signature, int length); |
85 | void devm_ioremap_release(struct device *dev, void *res); |
86 | |
87 | void *devm_memremap(struct device *dev, resource_size_t offset, |
88 | size_t size, unsigned long flags); |
89 | void devm_memunmap(struct device *dev, void *addr); |
90 | |
91 | void *__devm_memremap_pages(struct device *dev, struct resource *res); |
92 | |
93 | #ifdef CONFIG_PCI |
94 | /* |
95 | * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and |
96 | * Posting") mandate non-posted configuration transactions. There is |
97 | * no ioremap API in the kernel that can guarantee non-posted write |
98 | * semantics across arches so provide a default implementation for |
99 | * mapping PCI config space that defaults to ioremap_nocache(); arches |
100 | * should override it if they have memory mapping implementations that |
101 | * guarantee non-posted writes semantics to make the memory mapping |
102 | * compliant with the PCI specification. |
103 | */ |
104 | #ifndef pci_remap_cfgspace |
105 | #define pci_remap_cfgspace pci_remap_cfgspace |
106 | static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset, |
107 | size_t size) |
108 | { |
109 | return ioremap_nocache(offset, size); |
110 | } |
111 | #endif |
112 | #endif |
113 | |
114 | /* |
115 | * Some systems do not have legacy ISA devices. |
116 | * /dev/port is not a valid interface on these systems. |
117 | * So for those archs, <asm/io.h> should define the following symbol. |
118 | */ |
119 | #ifndef arch_has_dev_port |
120 | #define arch_has_dev_port() (1) |
121 | #endif |
122 | |
123 | /* |
124 | * Some systems (x86 without PAT) have a somewhat reliable way to mark a |
125 | * physical address range such that uncached mappings will actually |
126 | * end up write-combining. This facility should be used in conjunction |
127 | * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has |
128 | * no effect if the per-page mechanisms are functional. |
129 | * (On x86 without PAT, these functions manipulate MTRRs.) |
130 | * |
131 | * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed |
132 | * to have no effect. |
133 | */ |
134 | #ifndef arch_phys_wc_add |
135 | static inline int __must_check arch_phys_wc_add(unsigned long base, |
136 | unsigned long size) |
137 | { |
138 | return 0; /* It worked (i.e. did nothing). */ |
139 | } |
140 | |
141 | static inline void arch_phys_wc_del(int handle) |
142 | { |
143 | } |
144 | |
145 | #define arch_phys_wc_add arch_phys_wc_add |
146 | #ifndef arch_phys_wc_index |
147 | static inline int arch_phys_wc_index(int handle) |
148 | { |
149 | return -1; |
150 | } |
151 | #define arch_phys_wc_index arch_phys_wc_index |
152 | #endif |
153 | #endif |
154 | |
155 | enum { |
156 | /* See memremap() kernel-doc for usage description... */ |
157 | MEMREMAP_WB = 1 << 0, |
158 | MEMREMAP_WT = 1 << 1, |
159 | MEMREMAP_WC = 1 << 2, |
160 | MEMREMAP_ENC = 1 << 3, |
161 | MEMREMAP_DEC = 1 << 4, |
162 | }; |
163 | |
164 | void *memremap(resource_size_t offset, size_t size, unsigned long flags); |
165 | void memunmap(void *addr); |
166 | |
167 | /* |
168 | * On x86 PAT systems we have memory tracking that keeps track of |
169 | * the allowed mappings on memory ranges. This tracking works for |
170 | * all the in-kernel mapping APIs (ioremap*), but where the user |
171 | * wishes to map a range from a physical device into user memory |
172 | * the tracking won't be updated. This API is to be used by |
173 | * drivers which remap physical device pages into userspace, |
174 | * and wants to make sure they are mapped WC and not UC. |
175 | */ |
176 | #ifndef arch_io_reserve_memtype_wc |
177 | static inline int arch_io_reserve_memtype_wc(resource_size_t base, |
178 | resource_size_t size) |
179 | { |
180 | return 0; |
181 | } |
182 | |
183 | static inline void arch_io_free_memtype_wc(resource_size_t base, |
184 | resource_size_t size) |
185 | { |
186 | } |
187 | #endif |
188 | |
189 | #endif /* _LINUX_IO_H */ |
190 | |