dma.c

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/dma-direct.h>
 3
 4dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 5{
 6	return paddr | 0x80000000;
 7}
 8
 9phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
10{
11	if (dma_addr > 0x8fffffff)
12		return dma_addr;
13	return dma_addr & 0x0fffffff;
14}