41 lines
975 B
C
41 lines
975 B
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/init.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-mapping.h>
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#include <linux/dma-map-ops.h>
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#include <linux/swiotlb.h>
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#include <asm/bootinfo.h>
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#include <asm/dma.h>
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#include <asm/loongson.h>
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/*
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* We extract 4bit node id (bit 44~47) from Loongson-3's
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* 48bit physical address space and embed it into 40bit.
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*/
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static int node_id_offset;
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dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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long nid = (paddr >> 44) & 0xf;
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return ((nid << 44) ^ paddr) | (nid << node_id_offset);
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}
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phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
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{
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long nid = (daddr >> node_id_offset) & 0xf;
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return ((nid << node_id_offset) ^ daddr) | (nid << 44);
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}
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void __init plat_swiotlb_setup(void)
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{
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swiotlb_init(true, SWIOTLB_VERBOSE);
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node_id_offset = ((readl(LS7A_DMA_CFG) & LS7A_DMA_NODE_MASK) >> LS7A_DMA_NODE_SHF) + 36;
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}
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