summaryrefslogtreecommitdiffstats
path: root/include/asm-sh/dma.h
blob: e62a6d0ed932cec3631ee42e1d3e51331d09ae23 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
/*
 * include/asm-sh/dma.h
 *
 * Copyright (C) 2003, 2004  Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#ifndef __ASM_SH_DMA_H
#define __ASM_SH_DMA_H
#ifdef __KERNEL__

#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/sysdev.h>
#include <linux/device.h>
#include <asm/cpu/dma.h>
#include <asm/semaphore.h>

/* The maximum address that we can perform a DMA transfer to on this platform */
/* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
   occurrence should be flagged as an error.  */
/* But... */
/* XXX: This is not applicable to SuperH, just needed for alloc_bootmem */
#define MAX_DMA_ADDRESS		(PAGE_OFFSET+0x10000000)

#ifdef CONFIG_NR_DMA_CHANNELS
#  define MAX_DMA_CHANNELS	(CONFIG_NR_DMA_CHANNELS)
#else
#  define MAX_DMA_CHANNELS	(CONFIG_NR_ONCHIP_DMA_CHANNELS)
#endif

/*
 * Read and write modes can mean drastically different things depending on the
 * channel configuration. Consult your DMAC documentation and module
 * implementation for further clues.
 */
#define DMA_MODE_READ		0x00
#define DMA_MODE_WRITE		0x01
#define DMA_MODE_MASK		0x01

#define DMA_AUTOINIT		0x10

/*
 * DMAC (dma_info) flags
 */
enum {
	DMAC_CHANNELS_CONFIGURED	= 0x00,
	DMAC_CHANNELS_TEI_CAPABLE	= 0x01,
};

/*
 * DMA channel capabilities / flags
 */
enum {
	DMA_TEI_CAPABLE			= 0x01,
	DMA_CONFIGURED			= 0x02,
};

extern spinlock_t dma_spin_lock;

struct dma_channel;

struct dma_ops {
	int (*request)(struct dma_channel *chan);
	void (*free)(struct dma_channel *chan);

	int (*get_residue)(struct dma_channel *chan);
	int (*xfer)(struct dma_channel *chan);
	void (*configure)(struct dma_channel *chan, unsigned long flags);
};

struct dma_channel {
	char dev_id[16];

	unsigned int chan;		/* Physical channel number */
	unsigned int vchan;		/* Virtual channel number */
	unsigned int mode;
	unsigned int count;

	unsigned long sar;
	unsigned long dar;

	unsigned long flags;
	atomic_t busy;

	struct semaphore sem;
	wait_queue_head_t wait_queue;

	struct sys_device dev;
};

struct dma_info {
	struct platform_device *pdev;

	const char *name;
	unsigned int nr_channels;
	unsigned long flags;

	struct dma_ops *ops;
	struct dma_channel *channels;

	struct list_head list;
};

#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)

/* arch/sh/drivers/dma/dma-api.c */
extern int dma_xfer(unsigned int chan, unsigned long from,
		    unsigned long to, size_t size, unsigned int mode);

#define dma_write(chan, from, to, size)	\
	dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
#define dma_write_page(chan, from, to)	\
	dma_write(chan, from, to, PAGE_SIZE)

#define dma_read(chan, from, to, size)	\
	dma_xfer(chan, from, to, size, DMA_MODE_READ)
#define dma_read_page(chan, from, to)	\
	dma_read(chan, from, to, PAGE_SIZE)

extern int request_dma(unsigned int chan, const char *dev_id);
extern void free_dma(unsigned int chan);
extern int get_dma_residue(unsigned int chan);
extern struct dma_info *get_dma_info(unsigned int chan);
extern struct dma_channel *get_dma_channel(unsigned int chan);
extern void dma_wait_for_completion(unsigned int chan);
extern void dma_configure_channel(unsigned int chan, unsigned long flags);

extern int register_dmac(struct dma_info *info);
extern void unregister_dmac(struct dma_info *info);

#ifdef CONFIG_SYSFS
/* arch/sh/drivers/dma/dma-sysfs.c */
extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
#else
#define dma_create_sysfs_file(channel, info)		do { } while (0)
#define dma_remove_sysfs_file(channel, info)		do { } while (0)
#endif

#ifdef CONFIG_PCI
extern int isa_dma_bridge_buggy;
#else
#define isa_dma_bridge_buggy	(0)
#endif

#endif /* __KERNEL__ */
#endif /* __ASM_SH_DMA_H */