1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Based on linux/arch/arm/mm/dma-mapping.c
4 *
5 * Copyright (C) 2000-2004 Russell King
6 */
7
8 #include <linux/dma-map-ops.h>
9 #include <asm/cachetype.h>
10 #include <asm/cacheflush.h>
11 #include <asm/outercache.h>
12 #include <asm/cp15.h>
13
14 #include "dma.h"
15
16 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
17 enum dma_data_direction dir)
18 {
19 dmac_map_area(__va(paddr), size, dir);
20
21 if (dir == DMA_FROM_DEVICE)
22 outer_inv_range(paddr, paddr + size);
23 else
24 outer_clean_range(paddr, paddr + size);
25 }
26
27 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
28 enum dma_data_direction dir)
29 {
30 if (dir != DMA_TO_DEVICE) {
31 outer_inv_range(paddr, paddr + size);
32 dmac_unmap_area(__va(paddr), size, dir);
33 }
34 }
35
36 void arch_setup_dma_ops(struct device *dev, bool coherent)
37 {
38 if (IS_ENABLED(CONFIG_CPU_V7M)) {
39 /*
40 * Cache support for v7m is optional, so can be treated as
41 * coherent if no cache has been detected. Note that it is not
42 * enough to check if MPU is in use or not since in absense of
43 * MPU system memory map is used.
44 */
45 dev->dma_coherent = cacheid ? coherent : true;
46 } else {
47 /*
48 * Assume coherent DMA in case MMU/MPU has not been set up.
49 */
50 dev->dma_coherent = (get_cr() & CR_M) ? coherent : true;
51 }
52 }
53
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