1/*
2 * OpenRISC Linux
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others.  All original copyrights apply as per the original source
6 * declaration.
7 *
8 * OpenRISC implementation:
9 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 */
16
17#ifndef __ASM_OPENRISC_DMA_MAPPING_H
18#define __ASM_OPENRISC_DMA_MAPPING_H
19
20/*
21 * See Documentation/DMA-API-HOWTO.txt and
22 * Documentation/DMA-API.txt for documentation.
23 */
24
25#include <linux/dma-debug.h>
26#include <asm-generic/dma-coherent.h>
27#include <linux/kmemcheck.h>
28#include <linux/dma-mapping.h>
29
30#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)
31
32extern struct dma_map_ops or1k_dma_map_ops;
33
34static inline struct dma_map_ops *get_dma_ops(struct device *dev)
35{
36	return &or1k_dma_map_ops;
37}
38
39#include <asm-generic/dma-mapping-common.h>
40
41#define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
42
43static inline void *dma_alloc_attrs(struct device *dev, size_t size,
44				    dma_addr_t *dma_handle, gfp_t gfp,
45				    struct dma_attrs *attrs)
46{
47	struct dma_map_ops *ops = get_dma_ops(dev);
48	void *memory;
49
50	memory = ops->alloc(dev, size, dma_handle, gfp, attrs);
51
52	debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
53
54	return memory;
55}
56
57#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
58
59static inline void dma_free_attrs(struct device *dev, size_t size,
60				  void *cpu_addr, dma_addr_t dma_handle,
61				  struct dma_attrs *attrs)
62{
63	struct dma_map_ops *ops = get_dma_ops(dev);
64
65	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
66
67	ops->free(dev, size, cpu_addr, dma_handle, attrs);
68}
69
70static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
71					  dma_addr_t *dma_handle, gfp_t gfp)
72{
73	struct dma_attrs attrs;
74
75	dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
76
77	return dma_alloc_attrs(dev, size, dma_handle, gfp, &attrs);
78}
79
80static inline void dma_free_noncoherent(struct device *dev, size_t size,
81					 void *cpu_addr, dma_addr_t dma_handle)
82{
83	struct dma_attrs attrs;
84
85	dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
86
87	dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
88}
89
90static inline int dma_supported(struct device *dev, u64 dma_mask)
91{
92	/* Support 32 bit DMA mask exclusively */
93	return dma_mask == DMA_BIT_MASK(32);
94}
95
96static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
97{
98	return 0;
99}
100
101static inline int dma_set_mask(struct device *dev, u64 dma_mask)
102{
103	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
104		return -EIO;
105
106	*dev->dma_mask = dma_mask;
107
108	return 0;
109}
110#endif	/* __ASM_OPENRISC_DMA_MAPPING_H */
111