LXR linux/arch/h8300/kernel/dma.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file COPYING in the main directory of this archive
   4 * for more details.
   5 */
   6
   7#include <linux/dma-mapping.h>
   8#include <linux/kernel.h>
   9#include <linux/scatterlist.h>
  10#include <linux/module.h>
  11#include <asm/pgalloc.h>
  12
  13static void *dma_alloc(struct device *dev, size_t size,
  14                       dma_addr_t *dma_handle, gfp_t gfp,
  15                       unsigned long attrs)
  16{
  17        void *ret;
  18
  19        /* ignore region specifiers */
  20        gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
  21
  22        if (dev == NULL || (*dev->dma_mask < 0xffffffff))
  23                gfp |= GFP_DMA;
  24        ret = (void *)__get_free_pages(gfp, get_order(size));
  25
  26        if (ret != NULL) {
  27                memset(ret, 0, size);
  28                *dma_handle = virt_to_phys(ret);
  29        }
  30        return ret;
  31}
  32
  33static void dma_free(struct device *dev, size_t size,
  34                     void *vaddr, dma_addr_t dma_handle,
  35                     unsigned long attrs)
  36
  37{
  38        free_pages((unsigned long)vaddr, get_order(size));
  39}
  40
  41static dma_addr_t map_page(struct device *dev, struct page *page,
  42                                  unsigned long offset, size_t size,
  43                                  enum dma_data_direction direction,
  44                                  unsigned long attrs)
  45{
  46        return page_to_phys(page) + offset;
  47}
  48
  49static int map_sg(struct device *dev, struct scatterlist *sgl,
  50                  int nents, enum dma_data_direction direction,
  51                  unsigned long attrs)
  52{
  53        struct scatterlist *sg;
  54        int i;
  55
  56        for_each_sg(sgl, sg, nents, i) {
  57                sg->dma_address = sg_phys(sg);
  58        }
  59
  60        return nents;
  61}
  62
  63const struct dma_map_ops h8300_dma_map_ops = {
  64        .alloc = dma_alloc,
  65        .free = dma_free,
  66        .map_page = map_page,
  67        .map_sg = map_sg,
  68};
  69EXPORT_SYMBOL(h8300_dma_map_ops);
  70