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40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
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/*
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* Copyright (c) 2013 Luis R. Rodriguez <mcgrof@do-not-panic.com>
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*
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* Backport compatibility file for Linux for some DMA helpers
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-attrs.h>
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#include <linux/device.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)
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#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,6,0)
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#include <linux/dma-direction.h>
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#include <linux/dma-mapping.h>
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#include <asm/dma-mapping.h>
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#endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(3,6,0) */
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#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) */
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/*
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* Create scatter-list for the already allocated DMA buffer.
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*/
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int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
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void *cpu_addr, dma_addr_t handle, size_t size)
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{
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struct page *page = virt_to_page(cpu_addr);
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int ret;
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ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
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if (unlikely(ret))
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return ret;
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sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dma_common_get_sgtable);
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