2 * Copyright (c) 2015-2018 François Tigeot <ftigeot@wolfpond.org>
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>
35 #include <linux/bug.h>
37 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : (1ULL<<(n)) - 1)
39 static inline dma_addr_t
40 dma_map_page(struct device *dev, struct page *page,
41 unsigned long offset, size_t size, enum dma_data_direction direction)
43 return VM_PAGE_TO_PHYS((struct vm_page *)page) + offset;
46 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
47 size_t size, enum dma_data_direction dir)
52 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
58 dma_map_sg(struct device *dev, struct scatterlist *sg,
59 int nents, enum dma_data_direction dir)
61 struct scatterlist *s;
64 for_each_sg(sg, s, nents, i)
65 s->dma_address = sg_phys(s);
71 dma_unmap_sg(struct device *dev, struct scatterlist *sg,
72 int nents, enum dma_data_direction dir)
77 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
81 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
82 dma_addr_t dma_handle);
84 #endif /* _LINUX_DMA-MAPPING_H_ */