| 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 = 0; |
| 12 | const struct bus_dma_region *map = NULL; |
| 13 | |
| 14 | ret = acpi_dma_get_range(dev, map: &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 |