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d3bc81befc
Only loongson-3 is DMA coherent and uses swiotlb. So move the dma address translations stubs directly to the loongson-3 code, and remove a few Kconfig indirections. Signed-off-by: Christoph Hellwig <hch@lst.de> Patchwork: https://patchwork.linux-mips.org/patch/19539/ Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: David Daney <david.daney@cavium.com> Cc: Kevin Cernekee <cernekee@gmail.com> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com> Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de> Cc: Huacai Chen <chenhc@lemote.com> Cc: iommu@lists.linux-foundation.org Cc: linux-mips@linux-mips.org
26 lines
739 B
C
26 lines
739 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/dma-direct.h>
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#include <linux/init.h>
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#include <linux/swiotlb.h>
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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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/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
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* Loongson-3's 48bit address space and embed it into 40bit */
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long nid = (paddr >> 44) & 0x3;
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return ((nid << 44) ^ paddr) | (nid << 37);
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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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/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
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* Loongson-3's 48bit address space and embed it into 40bit */
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long nid = (daddr >> 37) & 0x3;
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return ((nid << 37) ^ 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(1);
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}
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