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, direction: 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, direction: dir); |
43 | } |
44 | |