1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This file is subject to the terms and conditions of the GNU General Public
4 * License.  See the file "COPYING" in the main directory of this archive
5 * for more details.
6 *
7 * Copyright (C) 2020 Loongson Technology Corporation Limited
8 *
9 */
10#include <linux/acpi.h>
11#include <linux/dma-direct.h>
12
13void acpi_arch_dma_setup(struct device *dev)
14{
15	int ret;
16	u64 mask, end = 0;
17	const struct bus_dma_region *map = NULL;
18
19	ret = acpi_dma_get_range(dev, &map);
20	if (!ret && map) {
21		const struct bus_dma_region *r = map;
22
23		for (end = 0; r->size; r++) {
24			if (r->dma_start + r->size - 1 > end)
25				end = r->dma_start + r->size - 1;
26		}
27
28		mask = DMA_BIT_MASK(ilog2(end) + 1);
29		dev->bus_dma_limit = end;
30		dev->dma_range_map = map;
31		dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask);
32		*dev->dma_mask = min(*dev->dma_mask, mask);
33	}
34
35}
36