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.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
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.
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.
32 #ifndef _LINUX_IO_MAPPING_H_
33 #define _LINUX_IO_MAPPING_H_
35 #include <sys/types.h>
36 #include <machine/vm.h>
38 #include <linux/types.h>
40 #include <linux/slab.h>
49 static inline struct io_mapping *
50 io_mapping_init_wc(struct io_mapping *mapping, resource_size_t base,
56 #ifdef VM_MEMATTR_WRITE_COMBINING
57 mapping->mem = ioremap_wc(base, size);
58 mapping->attr = VM_MEMATTR_WRITE_COMBINING;
60 mapping->mem = ioremap_nocache(base, size);
61 mapping->attr = VM_MEMATTR_UNCACHEABLE;
66 static inline struct io_mapping *
67 io_mapping_create_wc(resource_size_t base, unsigned long size)
69 struct io_mapping *mapping;
71 mapping = kmalloc(sizeof(*mapping), GFP_KERNEL);
74 return (io_mapping_init_wc(mapping, base, size));
78 io_mapping_fini(struct io_mapping *mapping)
81 iounmap(mapping->mem);
85 io_mapping_free(struct io_mapping *mapping)
88 io_mapping_fini(mapping->mem);
93 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset)
96 return ((char *)mapping->mem + offset);
100 io_mapping_unmap_atomic(void *vaddr)
105 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset,
109 return ((char *)mapping->mem + offset);
113 io_mapping_unmap(void *vaddr)
117 #endif /* _LINUX_IO_MAPPING_H_ */