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
7dma_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
16phys_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
25void __init plat_swiotlb_setup(void)
26{
27	swiotlb_init(true, SWIOTLB_VERBOSE);
28}
29