// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org> */ #include <linux/dma-direct.h> #include <asm/ip32/crime.h> /* * Few notes. * 1. CPU sees memory as two chunks: 0-256M@0x0, and the rest @0x40000000+256M * 2. PCI sees memory as one big chunk @0x0 (or we could use 0x40000000 for * native-endian) * 3. All other devices see memory as one big chunk at 0x40000000 * 4. Non-PCI devices will pass NULL as struct device* * * Thus we translate differently, depending on device. */ #define RAM_OFFSET_MASK 0x3fffffffUL dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) { dma_addr_t dma_addr = paddr & RAM_OFFSET_MASK; if (!dev) dma_addr += CRIME_HI_MEM_BASE; return dma_addr; } phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr) { phys_addr_t paddr = dma_addr & RAM_OFFSET_MASK; if (dma_addr >= 256*1024*1024) paddr += CRIME_HI_MEM_BASE; return paddr; }