1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
13 * disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 #ifndef _LINUX_IO_MAPPING_H_
33 #define _LINUX_IO_MAPPING_H_
34
35 #include <sys/types.h>
36 #include <machine/vm.h>
37
38 #include <linux/types.h>
39 #include <linux/io.h>
40 #include <linux/slab.h>
41
42 struct io_mapping {
43 unsigned long base;
44 unsigned long size;
45 void *mem;
46 vm_memattr_t attr;
47 };
48
49 static inline struct io_mapping *
io_mapping_init_wc(struct io_mapping * mapping,resource_size_t base,unsigned long size)50 io_mapping_init_wc(struct io_mapping *mapping, resource_size_t base,
51 unsigned long size)
52 {
53
54 mapping->base = base;
55 mapping->size = size;
56 #ifdef VM_MEMATTR_WRITE_COMBINING
57 mapping->mem = ioremap_wc(base, size);
58 mapping->attr = VM_MEMATTR_WRITE_COMBINING;
59 #else
60 mapping->mem = ioremap_nocache(base, size);
61 mapping->attr = VM_MEMATTR_UNCACHEABLE;
62 #endif
63 return (mapping);
64 }
65
66 static inline struct io_mapping *
io_mapping_create_wc(resource_size_t base,unsigned long size)67 io_mapping_create_wc(resource_size_t base, unsigned long size)
68 {
69 struct io_mapping *mapping;
70
71 mapping = kmalloc(sizeof(*mapping), GFP_KERNEL);
72 if (mapping == NULL)
73 return (NULL);
74 return (io_mapping_init_wc(mapping, base, size));
75 }
76
77 static inline void
io_mapping_fini(struct io_mapping * mapping)78 io_mapping_fini(struct io_mapping *mapping)
79 {
80
81 iounmap(mapping->mem);
82 }
83
84 static inline void
io_mapping_free(struct io_mapping * mapping)85 io_mapping_free(struct io_mapping *mapping)
86 {
87
88 io_mapping_fini(mapping->mem);
89 kfree(mapping);
90 }
91
92 static inline void *
io_mapping_map_atomic_wc(struct io_mapping * mapping,unsigned long offset)93 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset)
94 {
95
96 return ((char *)mapping->mem + offset);
97 }
98
99 static inline void
io_mapping_unmap_atomic(void * vaddr)100 io_mapping_unmap_atomic(void *vaddr)
101 {
102 }
103
104 static inline void *
io_mapping_map_wc(struct io_mapping * mapping,unsigned long offset,unsigned long size)105 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset,
106 unsigned long size)
107 {
108
109 return ((char *)mapping->mem + offset);
110 }
111
112 static inline void
io_mapping_unmap(void * vaddr)113 io_mapping_unmap(void *vaddr)
114 {
115 }
116
117 #endif /* _LINUX_IO_MAPPING_H_ */
118