1 /*
2 * linux/arch/unicore32/include/asm/dma-mapping.h
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12 #ifndef __UNICORE_DMA_MAPPING_H__
13 #define __UNICORE_DMA_MAPPING_H__
14
15 #ifdef __KERNEL__
16
17 #include <linux/mm_types.h>
18 #include <linux/scatterlist.h>
19 #include <linux/swiotlb.h>
20
21 #include <asm-generic/dma-coherent.h>
22
23 #include <asm/memory.h>
24 #include <asm/cacheflush.h>
25
26 extern struct dma_map_ops swiotlb_dma_map_ops;
27
get_dma_ops(struct device * dev)28 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
29 {
30 return &swiotlb_dma_map_ops;
31 }
32
dma_supported(struct device * dev,u64 mask)33 static inline int dma_supported(struct device *dev, u64 mask)
34 {
35 struct dma_map_ops *dma_ops = get_dma_ops(dev);
36
37 if (unlikely(dma_ops == NULL))
38 return 0;
39
40 return dma_ops->dma_supported(dev, mask);
41 }
42
dma_mapping_error(struct device * dev,dma_addr_t dma_addr)43 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
44 {
45 struct dma_map_ops *dma_ops = get_dma_ops(dev);
46
47 if (dma_ops->mapping_error)
48 return dma_ops->mapping_error(dev, dma_addr);
49
50 return 0;
51 }
52
53 #include <asm-generic/dma-mapping-common.h>
54
dma_capable(struct device * dev,dma_addr_t addr,size_t size)55 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
56 {
57 if (dev && dev->dma_mask)
58 return addr + size - 1 <= *dev->dma_mask;
59
60 return 1;
61 }
62
phys_to_dma(struct device * dev,phys_addr_t paddr)63 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
64 {
65 return paddr;
66 }
67
dma_to_phys(struct device * dev,dma_addr_t daddr)68 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
69 {
70 return daddr;
71 }
72
dma_mark_clean(void * addr,size_t size)73 static inline void dma_mark_clean(void *addr, size_t size) {}
74
dma_set_mask(struct device * dev,u64 dma_mask)75 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
76 {
77 if (!dev->dma_mask || !dma_supported(dev, dma_mask))
78 return -EIO;
79
80 *dev->dma_mask = dma_mask;
81
82 return 0;
83 }
84
dma_alloc_coherent(struct device * dev,size_t size,dma_addr_t * dma_handle,gfp_t flag)85 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
86 dma_addr_t *dma_handle, gfp_t flag)
87 {
88 struct dma_map_ops *dma_ops = get_dma_ops(dev);
89
90 return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
91 }
92
dma_free_coherent(struct device * dev,size_t size,void * cpu_addr,dma_addr_t dma_handle)93 static inline void dma_free_coherent(struct device *dev, size_t size,
94 void *cpu_addr, dma_addr_t dma_handle)
95 {
96 struct dma_map_ops *dma_ops = get_dma_ops(dev);
97
98 dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
99 }
100
101 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
102 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
103
dma_cache_sync(struct device * dev,void * vaddr,size_t size,enum dma_data_direction direction)104 static inline void dma_cache_sync(struct device *dev, void *vaddr,
105 size_t size, enum dma_data_direction direction)
106 {
107 unsigned long start = (unsigned long)vaddr;
108 unsigned long end = start + size;
109
110 switch (direction) {
111 case DMA_NONE:
112 BUG();
113 case DMA_FROM_DEVICE:
114 case DMA_BIDIRECTIONAL: /* writeback and invalidate */
115 __cpuc_dma_flush_range(start, end);
116 break;
117 case DMA_TO_DEVICE: /* writeback only */
118 __cpuc_dma_clean_range(start, end);
119 break;
120 }
121 }
122
123 #endif /* __KERNEL__ */
124 #endif
125