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[linux.git] / arch / loongarch / kernel / dma.c
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 }
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