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); 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