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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> |
22 | #include <linux/slab.h> |
23 | #include <asm/io.h> |
24 | #include <asm/page.h> |
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 | * |
30 | * See Documentation/io_mapping.txt |
31 | */ |
32 | |
33 | #ifdef CONFIG_HAVE_ATOMIC_IOMAP |
34 | |
35 | #include <asm/iomap.h> |
36 | |
37 | struct io_mapping { |
38 | resource_size_t base; |
39 | unsigned long size; |
40 | pgprot_t prot; |
41 | }; |
42 | |
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 | */ |
49 | |
50 | static inline struct io_mapping * |
51 | io_mapping_create_wc(resource_size_t base, unsigned long size) |
52 | { |
53 | struct io_mapping *iomap; |
54 | pgprot_t prot; |
55 | |
56 | iomap = kmalloc(sizeof(*iomap), GFP_KERNEL); |
57 | if (!iomap) |
58 | goto out_err; |
59 | |
60 | if (iomap_create_wc(base, size, &prot)) |
61 | goto out_free; |
62 | |
63 | iomap->base = base; |
64 | iomap->size = size; |
65 | iomap->prot = prot; |
66 | return iomap; |
67 | |
68 | out_free: |
69 | kfree(iomap); |
70 | out_err: |
71 | return NULL; |
72 | } |
73 | |
74 | static inline void |
75 | io_mapping_free(struct io_mapping *mapping) |
76 | { |
77 | iomap_free(mapping->base, mapping->size); |
78 | kfree(mapping); |
79 | } |
80 | |
81 | /* Atomic map/unmap */ |
82 | static inline void __iomem * |
83 | io_mapping_map_atomic_wc(struct io_mapping *mapping, |
84 | unsigned long offset) |
85 | { |
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); |
92 | return iomap_atomic_prot_pfn(pfn, mapping->prot); |
93 | } |
94 | |
95 | static inline void |
96 | io_mapping_unmap_atomic(void __iomem *vaddr) |
97 | { |
98 | iounmap_atomic(vaddr); |
99 | } |
100 | |
101 | static inline void __iomem * |
102 | io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) |
103 | { |
104 | resource_size_t phys_addr; |
105 | |
106 | BUG_ON(offset >= mapping->size); |
107 | phys_addr = mapping->base + offset; |
108 | |
109 | return ioremap_wc(phys_addr, PAGE_SIZE); |
110 | } |
111 | |
112 | static inline void |
113 | io_mapping_unmap(void __iomem *vaddr) |
114 | { |
115 | iounmap(vaddr); |
116 | } |
117 | |
118 | #else |
119 | |
120 | /* this struct isn't actually defined anywhere */ |
121 | struct io_mapping; |
122 | |
123 | /* Create the io_mapping object*/ |
124 | static inline struct io_mapping * |
125 | io_mapping_create_wc(resource_size_t base, unsigned long size) |
126 | { |
127 | return (struct io_mapping __force *) ioremap_wc(base, size); |
128 | } |
129 | |
130 | static inline void |
131 | io_mapping_free(struct io_mapping *mapping) |
132 | { |
133 | iounmap((void __force __iomem *) mapping); |
134 | } |
135 | |
136 | /* Atomic map/unmap */ |
137 | static inline void __iomem * |
138 | io_mapping_map_atomic_wc(struct io_mapping *mapping, |
139 | unsigned long offset) |
140 | { |
141 | return ((char __force __iomem *) mapping) + offset; |
142 | } |
143 | |
144 | static inline void |
145 | io_mapping_unmap_atomic(void __iomem *vaddr) |
146 | { |
147 | } |
148 | |
149 | /* Non-atomic map/unmap */ |
150 | static inline void __iomem * |
151 | io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) |
152 | { |
153 | return ((char __force __iomem *) mapping) + offset; |
154 | } |
155 | |
156 | static inline void |
157 | io_mapping_unmap(void __iomem *vaddr) |
158 | { |
159 | } |
160 | |
161 | #endif /* HAVE_ATOMIC_IOMAP */ |
162 | |
163 | #endif /* _LINUX_IO_MAPPING_H */ |
164 |
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