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
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
11 #ifndef __ASM_MACH_LOONGSON64_DMA_COHERENCE_H
12 #define __ASM_MACH_LOONGSON64_DMA_COHERENCE_H
15 #include <linux/swiotlb.h>
20 extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
21 extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
22 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
25 #ifdef CONFIG_CPU_LOONGSON3
26 return phys_to_dma(dev, virt_to_phys(addr));
28 return virt_to_phys(addr) | 0x80000000;
32 static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
35 #ifdef CONFIG_CPU_LOONGSON3
36 return phys_to_dma(dev, page_to_phys(page));
38 return page_to_phys(page) | 0x80000000;
42 static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
45 #if defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_64BIT)
46 return dma_to_phys(dev, dma_addr);
47 #elif defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
48 return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff);
50 return dma_addr & 0x7fffffff;
54 static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
55 size_t size, enum dma_data_direction direction)
59 static inline int plat_dma_supported(struct device *dev, u64 mask)
62 * we fall back to GFP_DMA when the mask isn't all 1s,
63 * so we can't guarantee allocations that must be
64 * within a tighter range than GFP_DMA..
66 if (mask < DMA_BIT_MASK(24))
72 static inline int plat_device_is_coherent(struct device *dev)
74 #ifdef CONFIG_DMA_NONCOHERENT
78 #endif /* CONFIG_DMA_NONCOHERENT */
81 static inline void plat_post_dma_flush(struct device *dev)
85 #endif /* __ASM_MACH_LOONGSON64_DMA_COHERENCE_H */