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
27extern struct dma_map_ops *tile_dma_map_ops;
28extern struct dma_map_ops *gx_pci_dma_map_ops;
29extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
30extern struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
31
32static 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
40static inline dma_addr_t get_dma_offset(struct device *dev)
41{
42	return dev->archdata.dma_offset;
43}
44
45static inline void set_dma_offset(struct device *dev, dma_addr_t off)
46{
47	dev->archdata.dma_offset = off;
48}
49
50static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
51{
52	return paddr;
53}
54
55static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
56{
57	return daddr;
58}
59
60static inline void dma_mark_clean(void *addr, size_t size) {}
61
62#include <asm-generic/dma-mapping-common.h>
63
64static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
65{
66	dev->archdata.dma_ops = ops;
67}
68
69static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
70{
71	if (!dev->dma_mask)
72		return 0;
73
74	return addr + size - 1 <= *dev->dma_mask;
75}
76
77static inline int
78dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
79{
80	debug_dma_mapping_error(dev, dma_addr);
81	return get_dma_ops(dev)->mapping_error(dev, dma_addr);
82}
83
84static inline int
85dma_supported(struct device *dev, u64 mask)
86{
87	return get_dma_ops(dev)->dma_supported(dev, mask);
88}
89
90static inline int
91dma_set_mask(struct device *dev, u64 mask)
92{
93	struct dma_map_ops *dma_ops = get_dma_ops(dev);
94
95	/*
96	 * For PCI devices with 64-bit DMA addressing capability, promote
97	 * the dma_ops to hybrid, with the consistent memory DMA space limited
98	 * to 32-bit. For 32-bit capable devices, limit the streaming DMA
99	 * address range to max_direct_dma_addr.
100	 */
101	if (dma_ops == gx_pci_dma_map_ops ||
102	    dma_ops == gx_hybrid_pci_dma_map_ops ||
103	    dma_ops == gx_legacy_pci_dma_map_ops) {
104		if (mask == DMA_BIT_MASK(64) &&
105		    dma_ops == gx_legacy_pci_dma_map_ops)
106			set_dma_ops(dev, gx_hybrid_pci_dma_map_ops);
107		else if (mask > dev->archdata.max_direct_dma_addr)
108			mask = dev->archdata.max_direct_dma_addr;
109	}
110
111	if (!dev->dma_mask || !dma_supported(dev, mask))
112		return -EIO;
113
114	*dev->dma_mask = mask;
115
116	return 0;
117}
118
119static inline void *dma_alloc_attrs(struct device *dev, size_t size,
120				    dma_addr_t *dma_handle, gfp_t flag,
121				    struct dma_attrs *attrs)
122{
123	struct dma_map_ops *dma_ops = get_dma_ops(dev);
124	void *cpu_addr;
125
126	cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs);
127
128	debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
129
130	return cpu_addr;
131}
132
133static inline void dma_free_attrs(struct device *dev, size_t size,
134				  void *cpu_addr, dma_addr_t dma_handle,
135				  struct dma_attrs *attrs)
136{
137	struct dma_map_ops *dma_ops = get_dma_ops(dev);
138
139	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
140
141	dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
142}
143
144#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
145#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
146#define dma_free_coherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
147#define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
148
149/*
150 * dma_alloc_noncoherent() is #defined to return coherent memory,
151 * so there's no need to do any flushing here.
152 */
153static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
154				  enum dma_data_direction direction)
155{
156}
157
158#endif /* _ASM_TILE_DMA_MAPPING_H */
159