1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 ARM Ltd.
4 * Author: Catalin Marinas <catalin.marinas@arm.com>
5 */
6
7 #include <linux/gfp.h>
8 #include <linux/cache.h>
9 #include <linux/dma-map-ops.h>
10 #include <linux/dma-iommu.h>
11 #include <xen/xen.h>
12 #include <xen/swiotlb-xen.h>
13
14 #include <asm/cacheflush.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 __dma_map_area(phys_to_virt(paddr), size, dir);
20 }
21
arch_sync_dma_for_cpu(phys_addr_t paddr,size_t size,enum dma_data_direction dir)22 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
23 enum dma_data_direction dir)
24 {
25 __dma_unmap_area(phys_to_virt(paddr), size, dir);
26 }
27
arch_dma_prep_coherent(struct page * page,size_t size)28 void arch_dma_prep_coherent(struct page *page, size_t size)
29 {
30 __dma_flush_area(page_address(page), size);
31 }
32
33 #ifdef CONFIG_IOMMU_DMA
arch_teardown_dma_ops(struct device * dev)34 void arch_teardown_dma_ops(struct device *dev)
35 {
36 dev->dma_ops = NULL;
37 }
38 #endif
39
arch_setup_dma_ops(struct device * dev,u64 dma_base,u64 size,const struct iommu_ops * iommu,bool coherent)40 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
41 const struct iommu_ops *iommu, bool coherent)
42 {
43 int cls = cache_line_size_of_cpu();
44
45 WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN,
46 TAINT_CPU_OUT_OF_SPEC,
47 "%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
48 dev_driver_string(dev), dev_name(dev),
49 ARCH_DMA_MINALIGN, cls);
50
51 dev->dma_coherent = coherent;
52 if (iommu)
53 iommu_setup_dma_ops(dev, dma_base, dma_base + size - 1);
54
55 #ifdef CONFIG_XEN
56 if (xen_swiotlb_detect())
57 dev->dma_ops = &xen_swiotlb_dma_ops;
58 #endif
59 }
60