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(addressing_limited: true, SWIOTLB_VERBOSE); |
28 | } |
29 | |