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
8void acpi_arch_dma_setup(struct device *dev)
9{
10	int ret;
11	u64 mask, end = 0;
12	const struct bus_dma_region *map = NULL;
13
14	ret = acpi_dma_get_range(dev, &map);
15	if (!ret && map) {
16		const struct bus_dma_region *r = map;
17
18		for (end = 0; r->size; r++) {
19			if (r->dma_start + r->size - 1 > end)
20				end = r->dma_start + r->size - 1;
21		}
22
23		mask = DMA_BIT_MASK(ilog2(end) + 1);
24		dev->bus_dma_limit = end;
25		dev->dma_range_map = map;
26		dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask);
27		*dev->dma_mask = min(*dev->dma_mask, mask);
28	}
29
30}
31