// SPDX-License-Identifier: GPL-2.0 #include <linux/dma-direct.h> dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) { return paddr | 0x80000000; } phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr) { if (dma_addr > 0x8fffffff) return dma_addr; return dma_addr & 0x0fffffff; }