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/iommu.h>
11#include <xen/xen.h>
12
13#include <asm/cacheflush.h>
14#include <asm/xen/xen-ops.h>
15
16void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
17 enum dma_data_direction dir)
18{
19 unsigned long start = (unsigned long)phys_to_virt(address: paddr);
20
21 dcache_clean_poc(start, start + size);
22}
23
24void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
25 enum dma_data_direction dir)
26{
27 unsigned long start = (unsigned long)phys_to_virt(address: paddr);
28
29 if (dir == DMA_TO_DEVICE)
30 return;
31
32 dcache_inval_poc(start, start + size);
33}
34
35void arch_dma_prep_coherent(struct page *page, size_t size)
36{
37 unsigned long start = (unsigned long)page_address(page);
38
39 dcache_clean_poc(start, start + size);
40}
41
42#ifdef CONFIG_IOMMU_DMA
43void arch_teardown_dma_ops(struct device *dev)
44{
45 dev->dma_ops = NULL;
46}
47#endif
48
49void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
50 bool coherent)
51{
52 int cls = cache_line_size_of_cpu();
53
54 WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN,
55 TAINT_CPU_OUT_OF_SPEC,
56 "%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
57 dev_driver_string(dev), dev_name(dev),
58 ARCH_DMA_MINALIGN, cls);
59
60 dev->dma_coherent = coherent;
61 if (device_iommu_mapped(dev))
62 iommu_setup_dma_ops(dev, dma_base, dma_limit: dma_base + size - 1);
63
64 xen_setup_dma_ops(dev);
65}
66

source code of linux/arch/arm64/mm/dma-mapping.c