dma-mapping.c

 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 <xen/xen.h>
11
12#include <asm/cacheflush.h>
13#include <asm/xen/xen-ops.h>
14
15void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
16			      enum dma_data_direction dir)
17{
18	unsigned long start = (unsigned long)phys_to_virt(paddr);
19
20	dcache_clean_poc(start, start + size);
21}
22
23void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
24			   enum dma_data_direction dir)
25{
26	unsigned long start = (unsigned long)phys_to_virt(paddr);
27
28	if (dir == DMA_TO_DEVICE)
29		return;
30
31	dcache_inval_poc(start, start + size);
32}
33
34void arch_dma_prep_coherent(struct page *page, size_t size)
35{
36	unsigned long start = (unsigned long)page_address(page);
37
38	dcache_clean_poc(start, start + size);
39}
40
41void arch_setup_dma_ops(struct device *dev, 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
53	xen_setup_dma_ops(dev);
54}