1 /*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 */
14
15 #ifndef _ASM_TILE_DMA_MAPPING_H
16 #define _ASM_TILE_DMA_MAPPING_H
17
18 #include <linux/mm.h>
19 #include <linux/scatterlist.h>
20 #include <linux/cache.h>
21 #include <linux/io.h>
22
23 #ifdef __tilegx__
24 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
25 #endif
26
27 extern struct dma_map_ops *tile_dma_map_ops;
28 extern struct dma_map_ops *gx_pci_dma_map_ops;
29 extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
30 extern struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
31
get_dma_ops(struct device * dev)32 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
33 {
34 if (dev && dev->archdata.dma_ops)
35 return dev->archdata.dma_ops;
36 else
37 return tile_dma_map_ops;
38 }
39
get_dma_offset(struct device * dev)40 static inline dma_addr_t get_dma_offset(struct device *dev)
41 {
42 return dev->archdata.dma_offset;
43 }
44
set_dma_offset(struct device * dev,dma_addr_t off)45 static inline void set_dma_offset(struct device *dev, dma_addr_t off)
46 {
47 dev->archdata.dma_offset = off;
48 }
49
phys_to_dma(struct device * dev,phys_addr_t paddr)50 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
51 {
52 return paddr;
53 }
54
dma_to_phys(struct device * dev,dma_addr_t daddr)55 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
56 {
57 return daddr;
58 }
59
dma_mark_clean(void * addr,size_t size)60 static inline void dma_mark_clean(void *addr, size_t size) {}
61
set_dma_ops(struct device * dev,struct dma_map_ops * ops)62 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
63 {
64 dev->archdata.dma_ops = ops;
65 }
66
dma_capable(struct device * dev,dma_addr_t addr,size_t size)67 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
68 {
69 if (!dev->dma_mask)
70 return 0;
71
72 return addr + size - 1 <= *dev->dma_mask;
73 }
74
75 #define HAVE_ARCH_DMA_SET_MASK 1
76
77 #include <asm-generic/dma-mapping-common.h>
78
79 static inline int
dma_set_mask(struct device * dev,u64 mask)80 dma_set_mask(struct device *dev, u64 mask)
81 {
82 struct dma_map_ops *dma_ops = get_dma_ops(dev);
83
84 /*
85 * For PCI devices with 64-bit DMA addressing capability, promote
86 * the dma_ops to hybrid, with the consistent memory DMA space limited
87 * to 32-bit. For 32-bit capable devices, limit the streaming DMA
88 * address range to max_direct_dma_addr.
89 */
90 if (dma_ops == gx_pci_dma_map_ops ||
91 dma_ops == gx_hybrid_pci_dma_map_ops ||
92 dma_ops == gx_legacy_pci_dma_map_ops) {
93 if (mask == DMA_BIT_MASK(64) &&
94 dma_ops == gx_legacy_pci_dma_map_ops)
95 set_dma_ops(dev, gx_hybrid_pci_dma_map_ops);
96 else if (mask > dev->archdata.max_direct_dma_addr)
97 mask = dev->archdata.max_direct_dma_addr;
98 }
99
100 if (!dev->dma_mask || !dma_supported(dev, mask))
101 return -EIO;
102
103 *dev->dma_mask = mask;
104
105 return 0;
106 }
107
108 /*
109 * dma_alloc_noncoherent() is #defined to return coherent memory,
110 * so there's no need to do any flushing here.
111 */
dma_cache_sync(struct device * dev,void * vaddr,size_t size,enum dma_data_direction direction)112 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
113 enum dma_data_direction direction)
114 {
115 }
116
117 #endif /* _ASM_TILE_DMA_MAPPING_H */
118