arch/sh/kernel/dma-coherent.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2004 - 2007  Paul Mundt
   4  */
   5 #include <linux/mm.h>
   6 #include <linux/dma-map-ops.h>
   7 #include <asm/cacheflush.h>
   8 #include <asm/addrspace.h>
   9
  10 void arch_dma_prep_coherent(struct page *page, size_t size)
  11 {
  12         __flush_purge_region(page_address(page), size);
  13 }
  14
  15 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
  16                 enum dma_data_direction dir)
  17 {
  18         void *addr = sh_cacheop_vaddr(phys_to_virt(paddr));
  19
  20         switch (dir) {
  21         case DMA_FROM_DEVICE:           /* invalidate only */
  22                 __flush_invalidate_region(addr, size);
  23                 break;
  24         case DMA_TO_DEVICE:             /* writeback only */
  25                 __flush_wback_region(addr, size);
  26                 break;
  27         case DMA_BIDIRECTIONAL:         /* writeback and invalidate */
  28                 __flush_purge_region(addr, size);
  29                 break;
  30         default:
  31                 BUG();
  32         }
  33 }