1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2006, 07 Ralf Baechle <ralf@linux-mips.org> 7 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology 8 * Author: Fuxin Zhang, zhangfx@lemote.com 9 * 10 */ 11#ifndef __ASM_MACH_LOONGSON_DMA_COHERENCE_H 12#define __ASM_MACH_LOONGSON_DMA_COHERENCE_H 13 14struct device; 15 16static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, 17 size_t size) 18{ 19 return virt_to_phys(addr) | 0x80000000; 20} 21 22static inline dma_addr_t plat_map_dma_mem_page(struct device *dev, 23 struct page *page) 24{ 25 return page_to_phys(page) | 0x80000000; 26} 27 28static inline unsigned long plat_dma_addr_to_phys(struct device *dev, 29 dma_addr_t dma_addr) 30{ 31#if defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT) 32 return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff); 33#else 34 return dma_addr & 0x7fffffff; 35#endif 36} 37 38static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr, 39 size_t size, enum dma_data_direction direction) 40{ 41} 42 43static inline int plat_dma_supported(struct device *dev, u64 mask) 44{ 45 /* 46 * we fall back to GFP_DMA when the mask isn't all 1s, 47 * so we can't guarantee allocations that must be 48 * within a tighter range than GFP_DMA.. 49 */ 50 if (mask < DMA_BIT_MASK(24)) 51 return 0; 52 53 return 1; 54} 55 56static inline void plat_extra_sync_for_device(struct device *dev) 57{ 58 return; 59} 60 61static inline int plat_dma_mapping_error(struct device *dev, 62 dma_addr_t dma_addr) 63{ 64 return 0; 65} 66 67static inline int plat_device_is_coherent(struct device *dev) 68{ 69 return 0; 70} 71 72#endif /* __ASM_MACH_LOONGSON_DMA_COHERENCE_H */ 73