linux/arch/m68k/kernel/dma.c
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   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#undef DEBUG
   8
   9#include <linux/dma-map-ops.h>
  10#include <linux/device.h>
  11#include <linux/kernel.h>
  12#include <linux/platform_device.h>
  13#include <linux/scatterlist.h>
  14#include <linux/slab.h>
  15#include <linux/vmalloc.h>
  16#include <linux/export.h>
  17
  18#include <asm/cacheflush.h>
  19
  20#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
  21void arch_dma_prep_coherent(struct page *page, size_t size)
  22{
  23        cache_push(page_to_phys(page), size);
  24}
  25
  26pgprot_t pgprot_dmacoherent(pgprot_t prot)
  27{
  28        if (CPU_IS_040_OR_060) {
  29                pgprot_val(prot) &= ~_PAGE_CACHE040;
  30                pgprot_val(prot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
  31        } else {
  32                pgprot_val(prot) |= _PAGE_NOCACHE030;
  33        }
  34        return prot;
  35}
  36#else
  37void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
  38                gfp_t gfp, unsigned long attrs)
  39{
  40        void *ret;
  41
  42        if (dev == NULL || (*dev->dma_mask < 0xffffffff))
  43                gfp |= GFP_DMA;
  44        ret = (void *)__get_free_pages(gfp, get_order(size));
  45
  46        if (ret != NULL) {
  47                memset(ret, 0, size);
  48                *dma_handle = virt_to_phys(ret);
  49        }
  50        return ret;
  51}
  52
  53void arch_dma_free(struct device *dev, size_t size, void *vaddr,
  54                dma_addr_t dma_handle, unsigned long attrs)
  55{
  56        free_pages((unsigned long)vaddr, get_order(size));
  57}
  58
  59#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
  60
  61void arch_sync_dma_for_device(phys_addr_t handle, size_t size,
  62                enum dma_data_direction dir)
  63{
  64        switch (dir) {
  65        case DMA_BIDIRECTIONAL:
  66        case DMA_TO_DEVICE:
  67                cache_push(handle, size);
  68                break;
  69        case DMA_FROM_DEVICE:
  70                cache_clear(handle, size);
  71                break;
  72        default:
  73                pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
  74                                   dir);
  75                break;
  76        }
  77}
  78