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
arch_sync_dma_for_device(phys_addr_t paddr,size_t size,enum dma_data_direction dir)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
arch_sync_dma_for_cpu(phys_addr_t paddr,size_t size,enum dma_data_direction dir)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
arch_setup_dma_ops(struct device * dev,u64 dma_base,u64 size,const struct iommu_ops * iommu,bool coherent)36 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
37 const struct iommu_ops *iommu, bool coherent)
38 {
39 if (IS_ENABLED(CONFIG_CPU_V7M)) {
40 /*
41 * Cache support for v7m is optional, so can be treated as
42 * coherent if no cache has been detected. Note that it is not
43 * enough to check if MPU is in use or not since in absense of
44 * MPU system memory map is used.
45 */
46 dev->dma_coherent = cacheid ? coherent : true;
47 } else {
48 /*
49 * Assume coherent DMA in case MMU/MPU has not been set up.
50 */
51 dev->dma_coherent = (get_cr() & CR_M) ? coherent : true;
52 }
53 }
54