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Viewing changes to arch/cris/arch-v32/drivers/pci/dma.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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arch/cris/arch-v32/drivers/pci/dma.c
 
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/*
 
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 * Dynamic DMA mapping support.
 
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 *
 
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 * On cris there is no hardware dynamic DMA address translation,
 
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 * so consistent alloc/free are merely page allocation/freeing.
 
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 * The rest of the dynamic DMA mapping interface is implemented
 
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 * in asm/pci.h.
 
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 *
 
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 * Borrowed from i386.
 
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 */
 
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#include <linux/types.h>
 
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#include <linux/mm.h>
 
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#include <linux/string.h>
 
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#include <linux/pci.h>
 
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#include <linux/gfp.h>
 
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#include <asm/io.h>
 
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void *dma_alloc_coherent(struct device *dev, size_t size,
 
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                           dma_addr_t *dma_handle, gfp_t gfp)
 
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{
 
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        void *ret;
 
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        int order = get_order(size);
 
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        /* ignore region specifiers */
 
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        gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
 
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        if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
 
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                return ret;
 
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        if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
 
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                gfp |= GFP_DMA;
 
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        ret = (void *)__get_free_pages(gfp, order);
 
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        if (ret != NULL) {
 
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                memset(ret, 0, size);
 
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                *dma_handle = virt_to_phys(ret);
 
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        }
 
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        return ret;
 
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}
 
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void dma_free_coherent(struct device *dev, size_t size,
 
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                         void *vaddr, dma_addr_t dma_handle)
 
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{
 
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        int order = get_order(size);
 
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        if (!dma_release_from_coherent(dev, order, vaddr))
 
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                free_pages((unsigned long)vaddr, order);
 
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}
 
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