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https://github.com/torvalds/linux
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5ceda74093
The __phys_to_dma vs phys_to_dma distinction isn't exactly obvious. Try to improve the situation by renaming __phys_to_dma to phys_to_dma_unencryped, and not forcing architectures that want to override phys_to_dma to actually provide __phys_to_dma. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Robin Murphy <robin.murphy@arm.com>
29 lines
797 B
C
29 lines
797 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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#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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