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
14#ifdef CONFIG_SWIOTLB
15#include <linux/swiotlb.h>
16#endif
17
18struct device;
19
20extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
21extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
22static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
23					  size_t size)
24{
25#ifdef CONFIG_CPU_LOONGSON3
26	return virt_to_phys(addr);
27#else
28	return virt_to_phys(addr) | 0x80000000;
29#endif
30}
31
32static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
33					       struct page *page)
34{
35#ifdef CONFIG_CPU_LOONGSON3
36	return page_to_phys(page);
37#else
38	return page_to_phys(page) | 0x80000000;
39#endif
40}
41
42static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
43	dma_addr_t dma_addr)
44{
45#if defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_64BIT)
46	return dma_addr;
47#elif defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
48	return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff);
49#else
50	return dma_addr & 0x7fffffff;
51#endif
52}
53
54static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
55	size_t size, enum dma_data_direction direction)
56{
57}
58
59static inline int plat_dma_supported(struct device *dev, u64 mask)
60{
61	/*
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..
65	 */
66	if (mask < DMA_BIT_MASK(24))
67		return 0;
68
69	return 1;
70}
71
72static inline int plat_device_is_coherent(struct device *dev)
73{
74#ifdef CONFIG_DMA_NONCOHERENT
75	return 0;
76#else
77	return 1;
78#endif /* CONFIG_DMA_NONCOHERENT */
79}
80
81#endif /* __ASM_MACH_LOONGSON_DMA_COHERENCE_H */