1d4b6f156SHuacai Chen // SPDX-License-Identifier: GPL-2.0 2d4b6f156SHuacai Chen /* 3d4b6f156SHuacai Chen * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4d4b6f156SHuacai Chen */ 5*c78c43feSJianmin Lv #include <linux/acpi.h> 6d4b6f156SHuacai Chen #include <linux/dma-direct.h> 7d4b6f156SHuacai Chen acpi_arch_dma_setup(struct device * dev)8*c78c43feSJianmin Lvvoid acpi_arch_dma_setup(struct device *dev) 9d4b6f156SHuacai Chen { 10*c78c43feSJianmin Lv int ret; 11*c78c43feSJianmin Lv u64 mask, end = 0; 12*c78c43feSJianmin Lv const struct bus_dma_region *map = NULL; 13d4b6f156SHuacai Chen 14*c78c43feSJianmin Lv ret = acpi_dma_get_range(dev, &map); 15*c78c43feSJianmin Lv if (!ret && map) { 16*c78c43feSJianmin Lv const struct bus_dma_region *r = map; 17*c78c43feSJianmin Lv 18*c78c43feSJianmin Lv for (end = 0; r->size; r++) { 19*c78c43feSJianmin Lv if (r->dma_start + r->size - 1 > end) 20*c78c43feSJianmin Lv end = r->dma_start + r->size - 1; 21d4b6f156SHuacai Chen } 22d4b6f156SHuacai Chen 23*c78c43feSJianmin Lv mask = DMA_BIT_MASK(ilog2(end) + 1); 24*c78c43feSJianmin Lv dev->bus_dma_limit = end; 25*c78c43feSJianmin Lv dev->dma_range_map = map; 26*c78c43feSJianmin Lv dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask); 27*c78c43feSJianmin Lv *dev->dma_mask = min(*dev->dma_mask, mask); 28d4b6f156SHuacai Chen } 29d4b6f156SHuacai Chen 30d4b6f156SHuacai Chen } 31