1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
4 */
5 #include <linux/acpi.h>
6 #include <linux/dma-direct.h>
7
8 void acpi_arch_dma_setup(struct device *dev)
9 {
10 int ret;
11 u64 mask, end;
12 const struct bus_dma_region *map = NULL;
13
14 ret = acpi_dma_get_range(dev, &map);
15 if (!ret && map) {
16 end = dma_range_map_max(map);
17
18 mask = DMA_BIT_MASK(ilog2(end) + 1);
19 dev->bus_dma_limit = end;
20 dev->dma_range_map = map;
21 dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask);
22 *dev->dma_mask = min(*dev->dma_mask, mask);
23 }
24
25 }
26
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