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-noncoherent.h>
  12 #include <linux/gfp.h>
  13 #include <linux/dma-debug.h>
  14 #include <linux/export.h>
  15 #include <linux/bug.h>
  16 #include <asm/cacheflush.h>
  17
  18 static void __dma_sync(phys_addr_t paddr, size_t size,
  19                 enum dma_data_direction direction)
  20 {
  21         switch (direction) {
  22         case DMA_TO_DEVICE:
  23         case DMA_BIDIRECTIONAL:
  24                 flush_dcache_range(paddr, paddr + size);
  25                 break;
  26         case DMA_FROM_DEVICE:
  27                 invalidate_dcache_range(paddr, paddr + size);
  28                 break;
  29         default:
  30                 BUG();
  31         }
  32 }
  33
  34 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
  35                 enum dma_data_direction dir)
  36 {
  37         __dma_sync(paddr, size, dir);
  38 }
  39
  40 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
  41                 enum dma_data_direction dir)
  42 {
  43         __dma_sync(paddr, size, dir);
  44 }