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