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
 8void 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}