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28 lines
797 B
28 lines
797 B
// 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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#include <boot_param.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 << 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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/* 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 >> node_id_offset) & 0x3; |
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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(1); |
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}
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