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 #include <linux/dma-map-ops.h>
   8 #include <linux/kernel.h>
   9 #include <asm/cacheflush.h>
  10
  11 #ifndef CONFIG_COLDFIRE
  12 void arch_dma_prep_coherent(struct page *page, size_t size)
  13 {
  14         cache_push(page_to_phys(page), size);
  15 }
  16
  17 pgprot_t pgprot_dmacoherent(pgprot_t prot)
  18 {
  19         if (CPU_IS_040_OR_060) {
  20                 pgprot_val(prot) &= ~_PAGE_CACHE040;
  21                 pgprot_val(prot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
  22         } else {
  23                 pgprot_val(prot) |= _PAGE_NOCACHE030;
  24         }
  25         return prot;
  26 }
  27 #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
  28
  29 void arch_sync_dma_for_device(phys_addr_t handle, size_t size,
  30                 enum dma_data_direction dir)
  31 {
  32         switch (dir) {
  33         case DMA_BIDIRECTIONAL:
  34         case DMA_TO_DEVICE:
  35                 cache_push(handle, size);
  36                 break;
  37         case DMA_FROM_DEVICE:
  38                 cache_clear(handle, size);
  39                 break;
  40         default:
  41                 pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
  42                                    dir);
  43                 break;
  44         }
  45 }