arch/microblaze/kernel/dma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2009-2010 PetaLogix
   4  * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
   5  *
   6  * Provide default implementations of the DMA mapping callbacks for
   7  * directly mapped busses.
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/dma-map-ops.h>
  12 #include <linux/gfp.h>
  13 #include <linux/export.h>
  14 #include <linux/bug.h>
  15 #include <asm/cacheflush.h>
  16
  17 static void __dma_sync(phys_addr_t paddr, size_t size,
  18                 enum dma_data_direction direction)
  19 {
  20         switch (direction) {
  21         case DMA_TO_DEVICE:
  22         case DMA_BIDIRECTIONAL:
  23                 flush_dcache_range(paddr, paddr + size);
  24                 break;
  25         case DMA_FROM_DEVICE:
  26                 invalidate_dcache_range(paddr, paddr + size);
  27                 break;
  28         default:
  29                 BUG();
  30         }
  31 }
  32
  33 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
  34                 enum dma_data_direction dir)
  35 {
  36         __dma_sync(paddr, size, dir);
  37 }
  38
  39 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
  40                 enum dma_data_direction dir)
  41 {
  42         __dma_sync(paddr, size, dir);
  43 }