2 * Copyright (c) 2015-2016 François Tigeot
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #ifndef _LINUX_IOMAPPING_H_
28 #define _LINUX_IOMAPPING_H_
30 #include <linux/types.h>
31 #include <linux/bug.h>
41 static inline struct io_mapping *
42 io_mapping_create_wc(resource_size_t base, unsigned long size)
44 struct io_mapping *map;
46 map = kmalloc(sizeof(struct io_mapping), M_DRM, M_WAITOK);
49 map->prot = VM_MEMATTR_WRITE_COMBINING;
51 map->vaddr = pmap_mapdev_attr(base, size,
52 VM_MEMATTR_WRITE_COMBINING);
53 if (map->vaddr == NULL)
59 static inline void io_mapping_free(struct io_mapping *mapping)
61 /* Default memory attribute is write-back */
62 pmap_mapdev_attr(mapping->base, mapping->size, VM_MEMATTR_WRITE_BACK);
67 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset)
69 return (void *)PHYS_TO_DMAP(mapping->base + offset);
73 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
75 return io_mapping_map_atomic_wc(mapping, offset);
78 static inline void io_mapping_unmap_atomic(void *vaddr)
82 #endif /* _LINUX_IOMAPPING_H_ */