1/*
2 * Implements the generic device dma API for microblaze and the pci
3 *
4 * Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu>
5 * Copyright (C) 2009-2010 PetaLogix
6 *
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License. See the file COPYING in the main directory of this
9 * archive for more details.
10 *
11 * This file is base on powerpc and x86 dma-mapping.h versions
12 * Copyright (C) 2004 IBM
13 */
14
15#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H
16#define _ASM_MICROBLAZE_DMA_MAPPING_H
17
18/*
19 * See Documentation/DMA-API-HOWTO.txt and
20 * Documentation/DMA-API.txt for documentation.
21 */
22
23#include <linux/types.h>
24#include <linux/cache.h>
25#include <linux/mm.h>
26#include <linux/scatterlist.h>
27#include <linux/dma-debug.h>
28#include <linux/dma-attrs.h>
29#include <asm/io.h>
30#include <asm-generic/dma-coherent.h>
31#include <asm/cacheflush.h>
32
33#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)
34
35#define __dma_alloc_coherent(dev, gfp, size, handle)	NULL
36#define __dma_free_coherent(size, addr)		((void)0)
37
38static inline unsigned long device_to_mask(struct device *dev)
39{
40	if (dev->dma_mask && *dev->dma_mask)
41		return *dev->dma_mask;
42	/* Assume devices without mask can take 32 bit addresses */
43	return 0xfffffffful;
44}
45
46extern struct dma_map_ops *dma_ops;
47
48/*
49 * Available generic sets of operations
50 */
51extern struct dma_map_ops dma_direct_ops;
52
53static inline struct dma_map_ops *get_dma_ops(struct device *dev)
54{
55	/* We don't handle the NULL dev case for ISA for now. We could
56	 * do it via an out of line call but it is not needed for now. The
57	 * only ISA DMA device we support is the floppy and we have a hack
58	 * in the floppy driver directly to get a device for us.
59	 */
60	if (unlikely(!dev) || !dev->archdata.dma_ops)
61		return NULL;
62
63	return dev->archdata.dma_ops;
64}
65
66static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
67{
68	dev->archdata.dma_ops = ops;
69}
70
71static inline int dma_supported(struct device *dev, u64 mask)
72{
73	struct dma_map_ops *ops = get_dma_ops(dev);
74
75	if (unlikely(!ops))
76		return 0;
77	if (!ops->dma_supported)
78		return 1;
79	return ops->dma_supported(dev, mask);
80}
81
82static inline int dma_set_mask(struct device *dev, u64 dma_mask)
83{
84	struct dma_map_ops *ops = get_dma_ops(dev);
85
86	if (unlikely(ops == NULL))
87		return -EIO;
88	if (ops->set_dma_mask)
89		return ops->set_dma_mask(dev, dma_mask);
90	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
91		return -EIO;
92	*dev->dma_mask = dma_mask;
93	return 0;
94}
95
96#include <asm-generic/dma-mapping-common.h>
97
98static inline void __dma_sync(unsigned long paddr,
99			      size_t size, enum dma_data_direction direction)
100{
101	switch (direction) {
102	case DMA_TO_DEVICE:
103	case DMA_BIDIRECTIONAL:
104		flush_dcache_range(paddr, paddr + size);
105		break;
106	case DMA_FROM_DEVICE:
107		invalidate_dcache_range(paddr, paddr + size);
108		break;
109	default:
110		BUG();
111	}
112}
113
114static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
115{
116	struct dma_map_ops *ops = get_dma_ops(dev);
117	if (ops->mapping_error)
118		return ops->mapping_error(dev, dma_addr);
119
120	return (dma_addr == DMA_ERROR_CODE);
121}
122
123#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
124#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
125
126#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
127
128static inline void *dma_alloc_attrs(struct device *dev, size_t size,
129				    dma_addr_t *dma_handle, gfp_t flag,
130				    struct dma_attrs *attrs)
131{
132	struct dma_map_ops *ops = get_dma_ops(dev);
133	void *memory;
134
135	BUG_ON(!ops);
136
137	memory = ops->alloc(dev, size, dma_handle, flag, attrs);
138
139	debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
140	return memory;
141}
142
143#define dma_free_coherent(d,s,c,h) dma_free_attrs(d, s, c, h, NULL)
144
145static inline void dma_free_attrs(struct device *dev, size_t size,
146				  void *cpu_addr, dma_addr_t dma_handle,
147				  struct dma_attrs *attrs)
148{
149	struct dma_map_ops *ops = get_dma_ops(dev);
150
151	BUG_ON(!ops);
152	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
153	ops->free(dev, size, cpu_addr, dma_handle, attrs);
154}
155
156static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
157		enum dma_data_direction direction)
158{
159	BUG_ON(direction == DMA_NONE);
160	__dma_sync(virt_to_phys(vaddr), size, (int)direction);
161}
162
163#endif	/* _ASM_MICROBLAZE_DMA_MAPPING_H */
164