| // 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; |
| } |