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Linux/arch/cris/arch-v32/drivers/pci/dma.c

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  1 /*
  2  * Dynamic DMA mapping support.
  3  *
  4  * On cris there is no hardware dynamic DMA address translation,
  5  * so consistent alloc/free are merely page allocation/freeing.
  6  * The rest of the dynamic DMA mapping interface is implemented
  7  * in asm/pci.h.
  8  *
  9  * Borrowed from i386.
 10  */
 11 
 12 #include <linux/types.h>
 13 #include <linux/mm.h>
 14 #include <linux/string.h>
 15 #include <linux/pci.h>
 16 #include <linux/gfp.h>
 17 #include <asm/io.h>
 18 
 19 void *dma_alloc_coherent(struct device *dev, size_t size,
 20                            dma_addr_t *dma_handle, gfp_t gfp)
 21 {
 22         void *ret;
 23         int order = get_order(size);
 24         /* ignore region specifiers */
 25         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
 26 
 27         if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
 28                 return ret;
 29 
 30         if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
 31                 gfp |= GFP_DMA;
 32 
 33         ret = (void *)__get_free_pages(gfp, order);
 34 
 35         if (ret != NULL) {
 36                 memset(ret, 0, size);
 37                 *dma_handle = virt_to_phys(ret);
 38         }
 39         return ret;
 40 }
 41 
 42 void dma_free_coherent(struct device *dev, size_t size,
 43                          void *vaddr, dma_addr_t dma_handle)
 44 {
 45         int order = get_order(size);
 46 
 47         if (!dma_release_from_coherent(dev, order, vaddr))
 48                 free_pages((unsigned long)vaddr, order);
 49 }
 50 
 51 

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