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 _LINUXKPI_LINUX_IO_MAPPING_H_
33 #define _LINUXKPI_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 struct io_mapping *io_mapping_create_wc(resource_size_t base, unsigned long size);
50
51 static inline struct io_mapping *
io_mapping_init_wc(struct io_mapping * mapping,resource_size_t base,unsigned long size)52 io_mapping_init_wc(struct io_mapping *mapping, resource_size_t base,
53 unsigned long size)
54 {
55
56 mapping->base = base;
57 mapping->size = size;
58 #ifdef VM_MEMATTR_WRITE_COMBINING
59 mapping->mem = ioremap_wc(base, size);
60 mapping->attr = VM_MEMATTR_WRITE_COMBINING;
61 #else
62 mapping->mem = ioremap_nocache(base, size);
63 mapping->attr = VM_MEMATTR_UNCACHEABLE;
64 #endif
65 return (mapping);
66 }
67
68 static inline void
io_mapping_fini(struct io_mapping * mapping)69 io_mapping_fini(struct io_mapping *mapping)
70 {
71
72 iounmap(mapping->mem);
73 }
74
75 static inline void
io_mapping_free(struct io_mapping * mapping)76 io_mapping_free(struct io_mapping *mapping)
77 {
78
79 io_mapping_fini(mapping->mem);
80 kfree(mapping);
81 }
82
83 static inline void *
io_mapping_map_atomic_wc(struct io_mapping * mapping,unsigned long offset)84 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset)
85 {
86
87 return ((char *)mapping->mem + offset);
88 }
89
90 static inline void
io_mapping_unmap_atomic(void * vaddr)91 io_mapping_unmap_atomic(void *vaddr)
92 {
93 }
94
95 static inline void *
io_mapping_map_wc(struct io_mapping * mapping,unsigned long offset,unsigned long size)96 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset,
97 unsigned long size)
98 {
99
100 return ((char *)mapping->mem + offset);
101 }
102
103 static inline void
io_mapping_unmap(void * vaddr)104 io_mapping_unmap(void *vaddr)
105 {
106 }
107
108 #endif /* _LINUXKPI_LINUX_IO_MAPPING_H_ */
109