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 }
44
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