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 | |
15 | void 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(address: paddr); |
19 | |
20 | dcache_clean_poc(start, start + size); |
21 | } |
22 | |
23 | void 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(address: paddr); |
27 | |
28 | if (dir == DMA_TO_DEVICE) |
29 | return; |
30 | |
31 | dcache_inval_poc(start, start + size); |
32 | } |
33 | |
34 | void 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 | |
41 | void 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 | } |
55 |