LXR linux/arch/m68k/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#undef DEBUG
   8
   9#include <linux/dma-noncoherent.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
  37
  38#include <asm/cacheflush.h>
  39
  40void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
  41                gfp_t gfp, unsigned long attrs)
  42{
  43        void *ret;
  44
  45        if (dev == NULL || (*dev->dma_mask < 0xffffffff))
  46                gfp |= GFP_DMA;
  47        ret = (void *)__get_free_pages(gfp, get_order(size));
  48
  49        if (ret != NULL) {
  50                memset(ret, 0, size);
  51                *dma_handle = virt_to_phys(ret);
  52        }
  53        return ret;
  54}
  55
  56void arch_dma_free(struct device *dev, size_t size, void *vaddr,
  57                dma_addr_t dma_handle, unsigned long attrs)
  58{
  59        free_pages((unsigned long)vaddr, get_order(size));
  60}
  61
  62#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
  63
  64void arch_sync_dma_for_device(phys_addr_t handle, size_t size,
  65                enum dma_data_direction dir)
  66{
  67        switch (dir) {
  68        case DMA_BIDIRECTIONAL:
  69        case DMA_TO_DEVICE:
  70                cache_push(handle, size);
  71                break;
  72        case DMA_FROM_DEVICE:
  73                cache_clear(handle, size);
  74                break;
  75        default:
  76                pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
  77                                   dir);
  78                break;
  79        }
  80}
  81