26 lines
739 B
C
26 lines
739 B
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);
|
|
}
|