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9663f2e6 KP |
1 | /* |
2 | * Copyright © 2008 Keith Packard <keithp@keithp.com> | |
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_MAPPING_H | |
19 | #define _LINUX_IO_MAPPING_H | |
20 | ||
21 | #include <linux/types.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
9663f2e6 KP |
23 | #include <asm/io.h> |
24 | #include <asm/page.h> | |
9663f2e6 KP |
25 | |
26 | /* | |
27 | * The io_mapping mechanism provides an abstraction for mapping | |
28 | * individual pages from an io device to the CPU in an efficient fashion. | |
29 | * | |
395cf969 | 30 | * See Documentation/io-mapping.txt |
9663f2e6 KP |
31 | */ |
32 | ||
e5beae16 KP |
33 | #ifdef CONFIG_HAVE_ATOMIC_IOMAP |
34 | ||
31ce4bfd DA |
35 | #include <asm/iomap.h> |
36 | ||
4ab0d47d VP |
37 | struct io_mapping { |
38 | resource_size_t base; | |
39 | unsigned long size; | |
40 | pgprot_t prot; | |
41 | }; | |
42 | ||
e5beae16 KP |
43 | /* |
44 | * For small address space machines, mapping large objects | |
45 | * into the kernel virtual space isn't practical. Where | |
46 | * available, use fixmap support to dynamically map pages | |
47 | * of the object at run time. | |
48 | */ | |
9663f2e6 | 49 | |
9663f2e6 | 50 | static inline struct io_mapping * |
4ab0d47d | 51 | io_mapping_create_wc(resource_size_t base, unsigned long size) |
9663f2e6 | 52 | { |
4ab0d47d | 53 | struct io_mapping *iomap; |
9e36fda0 | 54 | pgprot_t prot; |
4ab0d47d VP |
55 | |
56 | iomap = kmalloc(sizeof(*iomap), GFP_KERNEL); | |
57 | if (!iomap) | |
9e36fda0 VP |
58 | goto out_err; |
59 | ||
60 | if (iomap_create_wc(base, size, &prot)) | |
61 | goto out_free; | |
4ab0d47d VP |
62 | |
63 | iomap->base = base; | |
64 | iomap->size = size; | |
9e36fda0 | 65 | iomap->prot = prot; |
4ab0d47d | 66 | return iomap; |
9e36fda0 VP |
67 | |
68 | out_free: | |
69 | kfree(iomap); | |
70 | out_err: | |
71 | return NULL; | |
9663f2e6 KP |
72 | } |
73 | ||
74 | static inline void | |
75 | io_mapping_free(struct io_mapping *mapping) | |
76 | { | |
9e36fda0 | 77 | iomap_free(mapping->base, mapping->size); |
4ab0d47d | 78 | kfree(mapping); |
9663f2e6 KP |
79 | } |
80 | ||
81 | /* Atomic map/unmap */ | |
29bc17ec | 82 | static inline void __iomem * |
fca3ec01 | 83 | io_mapping_map_atomic_wc(struct io_mapping *mapping, |
3e4d3af5 | 84 | unsigned long offset) |
9663f2e6 | 85 | { |
4ab0d47d VP |
86 | resource_size_t phys_addr; |
87 | unsigned long pfn; | |
88 | ||
89 | BUG_ON(offset >= mapping->size); | |
90 | phys_addr = mapping->base + offset; | |
91 | pfn = (unsigned long) (phys_addr >> PAGE_SHIFT); | |
3e4d3af5 | 92 | return iomap_atomic_prot_pfn(pfn, mapping->prot); |
9663f2e6 KP |
93 | } |
94 | ||
95 | static inline void | |
3e4d3af5 | 96 | io_mapping_unmap_atomic(void __iomem *vaddr) |
9663f2e6 | 97 | { |
3e4d3af5 | 98 | iounmap_atomic(vaddr); |
9663f2e6 KP |
99 | } |
100 | ||
29bc17ec | 101 | static inline void __iomem * |
9663f2e6 KP |
102 | io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) |
103 | { | |
5ce04e3d PV |
104 | resource_size_t phys_addr; |
105 | ||
4ab0d47d | 106 | BUG_ON(offset >= mapping->size); |
5ce04e3d PV |
107 | phys_addr = mapping->base + offset; |
108 | ||
4ab0d47d | 109 | return ioremap_wc(phys_addr, PAGE_SIZE); |
9663f2e6 KP |
110 | } |
111 | ||
112 | static inline void | |
29bc17ec | 113 | io_mapping_unmap(void __iomem *vaddr) |
9663f2e6 | 114 | { |
e5beae16 | 115 | iounmap(vaddr); |
9663f2e6 KP |
116 | } |
117 | ||
e5beae16 | 118 | #else |
9663f2e6 | 119 | |
4ab0d47d VP |
120 | /* this struct isn't actually defined anywhere */ |
121 | struct io_mapping; | |
122 | ||
e5beae16 | 123 | /* Create the io_mapping object*/ |
9663f2e6 | 124 | static inline struct io_mapping * |
4ab0d47d | 125 | io_mapping_create_wc(resource_size_t base, unsigned long size) |
9663f2e6 | 126 | { |
29bc17ec | 127 | return (struct io_mapping __force *) ioremap_wc(base, size); |
9663f2e6 KP |
128 | } |
129 | ||
130 | static inline void | |
131 | io_mapping_free(struct io_mapping *mapping) | |
132 | { | |
29bc17ec | 133 | iounmap((void __force __iomem *) mapping); |
9663f2e6 KP |
134 | } |
135 | ||
136 | /* Atomic map/unmap */ | |
29bc17ec | 137 | static inline void __iomem * |
fca3ec01 | 138 | io_mapping_map_atomic_wc(struct io_mapping *mapping, |
3e4d3af5 | 139 | unsigned long offset) |
9663f2e6 | 140 | { |
29bc17ec | 141 | return ((char __force __iomem *) mapping) + offset; |
9663f2e6 KP |
142 | } |
143 | ||
144 | static inline void | |
3e4d3af5 | 145 | io_mapping_unmap_atomic(void __iomem *vaddr) |
9663f2e6 | 146 | { |
9663f2e6 KP |
147 | } |
148 | ||
e5beae16 | 149 | /* Non-atomic map/unmap */ |
29bc17ec | 150 | static inline void __iomem * |
9663f2e6 KP |
151 | io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) |
152 | { | |
29bc17ec | 153 | return ((char __force __iomem *) mapping) + offset; |
9663f2e6 KP |
154 | } |
155 | ||
156 | static inline void | |
29bc17ec | 157 | io_mapping_unmap(void __iomem *vaddr) |
9663f2e6 | 158 | { |
9663f2e6 | 159 | } |
e5beae16 KP |
160 | |
161 | #endif /* HAVE_ATOMIC_IOMAP */ | |
9663f2e6 KP |
162 | |
163 | #endif /* _LINUX_IO_MAPPING_H */ |