1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/dma-direct.h> 3 #include <linux/init.h> 4 #include <linux/swiotlb.h> 5 #include <boot_param.h> 6 7 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) 8 { 9 /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from 10 * Loongson-3's 48bit address space and embed it into 40bit */ 11 long nid = (paddr >> 44) & 0x3; 12 13 return ((nid << 44) ^ paddr) | (nid << node_id_offset); 14 } 15 16 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) 17 { 18 /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from 19 * Loongson-3's 48bit address space and embed it into 40bit */ 20 long nid = (daddr >> node_id_offset) & 0x3; 21 22 return ((nid << node_id_offset) ^ daddr) | (nid << 44); 23 } 24 25 void __init plat_swiotlb_setup(void) 26 { 27 swiotlb_init(true, SWIOTLB_VERBOSE); 28 } 29