LXR linux/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
  10void arch_dma_prep_coherent(struct page *page, size_t size)
  11{
  12        __flush_purge_region(page_address(page), size);
  13}
  14
  15void 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}
  34