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_DMA_MAPPING_H_
28 #define _LINUX_DMA_MAPPING_H_
30 #include <linux/string.h>
31 #include <linux/device.h>
32 #include <linux/err.h>
33 #include <linux/dma-direction.h>
34 #include <linux/scatterlist.h>
36 static inline dma_addr_t
37 dma_map_page(struct device
*dev
, struct vm_page
*page
,
38 unsigned long offset
, size_t size
, enum dma_data_direction direction
)
40 return VM_PAGE_TO_PHYS(page
) + offset
;
43 static inline void dma_unmap_page(struct device
*dev
, dma_addr_t addr
,
44 size_t size
, enum dma_data_direction dir
)
49 dma_mapping_error(struct device
*dev
, dma_addr_t dma_addr
)
55 dma_map_sg(struct device
*dev
, struct scatterlist
*sg
,
56 int nents
, enum dma_data_direction dir
)
58 struct scatterlist
*s
;
61 for_each_sg(sg
, s
, nents
, i
)
62 s
->dma_address
= sg_phys(s
);
68 dma_unmap_sg(struct device
*dev
, struct scatterlist
*sg
,
69 int nents
, enum dma_data_direction dir
)
73 #endif /* _LINUX_DMA-MAPPING_H_ */