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
17static 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
33void 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
39void 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