swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
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Tip revision: def9d2780727cec3313ed3522d0123158d87224d authored by Linus Torvalds on 20 January 2020, 00:02:49 UTC
Linux 5.5-rc7
Tip revision: def9d27
dma.c
// SPDX-License-Identifier: GPL-2.0
#include <linux/dma-direct.h>
#include <linux/init.h>
#include <linux/swiotlb.h>

dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
{
	/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
	 * Loongson-3's 48bit address space and embed it into 40bit */
	long nid = (paddr >> 44) & 0x3;
	return ((nid << 44) ^ paddr) | (nid << 37);
}

phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
{
	/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
	 * Loongson-3's 48bit address space and embed it into 40bit */
	long nid = (daddr >> 37) & 0x3;
	return ((nid << 37) ^ daddr) | (nid << 44);
}

void __init plat_swiotlb_setup(void)
{
	swiotlb_init(1);
}
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