1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
/*
* Copyright (c) 2013 Luis R. Rodriguez <mcgrof@do-not-panic.com>
*
* Backport compatibility file for Linux for some DMA helpers
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/dma-attrs.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)
#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,6,0)
#include <linux/dma-direction.h>
#include <linux/dma-mapping.h>
#include <asm/dma-mapping.h>
#endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(3,6,0) */
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) */
/*
* Create scatter-list for the already allocated DMA buffer.
*/
int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t handle, size_t size)
{
struct page *page = virt_to_page(cpu_addr);
int ret;
ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
if (unlikely(ret))
return ret;
sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
return 0;
}
EXPORT_SYMBOL_GPL(dma_common_get_sgtable);
|
