18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * This file is subject to the terms and conditions of the GNU General Public 48c2ecf20Sopenharmony_ci * License. See the file "COPYING" in the main directory of this archive 58c2ecf20Sopenharmony_ci * for more details. 68c2ecf20Sopenharmony_ci * 78c2ecf20Sopenharmony_ci * Copyright (C) 2020 Loongson Technology Corporation Limited 88c2ecf20Sopenharmony_ci * 98c2ecf20Sopenharmony_ci */ 108c2ecf20Sopenharmony_ci#include <linux/acpi.h> 118c2ecf20Sopenharmony_ci#include <linux/dma-direct.h> 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_civoid acpi_arch_dma_setup(struct device *dev) 148c2ecf20Sopenharmony_ci{ 158c2ecf20Sopenharmony_ci int ret; 168c2ecf20Sopenharmony_ci u64 mask, end = 0; 178c2ecf20Sopenharmony_ci const struct bus_dma_region *map = NULL; 188c2ecf20Sopenharmony_ci 198c2ecf20Sopenharmony_ci ret = acpi_dma_get_range(dev, &map); 208c2ecf20Sopenharmony_ci if (!ret && map) { 218c2ecf20Sopenharmony_ci const struct bus_dma_region *r = map; 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci for (end = 0; r->size; r++) { 248c2ecf20Sopenharmony_ci if (r->dma_start + r->size - 1 > end) 258c2ecf20Sopenharmony_ci end = r->dma_start + r->size - 1; 268c2ecf20Sopenharmony_ci } 278c2ecf20Sopenharmony_ci 288c2ecf20Sopenharmony_ci mask = DMA_BIT_MASK(ilog2(end) + 1); 298c2ecf20Sopenharmony_ci dev->bus_dma_limit = end; 308c2ecf20Sopenharmony_ci dev->dma_range_map = map; 318c2ecf20Sopenharmony_ci dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask); 328c2ecf20Sopenharmony_ci *dev->dma_mask = min(*dev->dma_mask, mask); 338c2ecf20Sopenharmony_ci } 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci} 36