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Linux kernel mirror (for testing)
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linux
1/*
2 * include/asm-sh/dma.h
3 *
4 * Copyright (C) 2003, 2004 Paul Mundt
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10#ifndef __ASM_SH_DMA_H
11#define __ASM_SH_DMA_H
12#ifdef __KERNEL__
13
14#include <linux/spinlock.h>
15#include <linux/wait.h>
16#include <linux/sched.h>
17#include <linux/sysdev.h>
18#include <asm/cpu/dma.h>
19
20/* The maximum address that we can perform a DMA transfer to on this platform */
21/* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
22 occurrence should be flagged as an error. */
23/* But... */
24/* XXX: This is not applicable to SuperH, just needed for alloc_bootmem */
25#define MAX_DMA_ADDRESS (PAGE_OFFSET+0x10000000)
26
27#ifdef CONFIG_NR_DMA_CHANNELS
28# define MAX_DMA_CHANNELS (CONFIG_NR_DMA_CHANNELS)
29#else
30# define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS)
31#endif
32
33/*
34 * Read and write modes can mean drastically different things depending on the
35 * channel configuration. Consult your DMAC documentation and module
36 * implementation for further clues.
37 */
38#define DMA_MODE_READ 0x00
39#define DMA_MODE_WRITE 0x01
40#define DMA_MODE_MASK 0x01
41
42#define DMA_AUTOINIT 0x10
43
44/*
45 * DMAC (dma_info) flags
46 */
47enum {
48 DMAC_CHANNELS_CONFIGURED = 0x01,
49 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */
50};
51
52/*
53 * DMA channel capabilities / flags
54 */
55enum {
56 DMA_CONFIGURED = 0x01,
57
58 /*
59 * Transfer end interrupt, inherited from DMAC.
60 * wait_queue used in dma_wait_for_completion.
61 */
62 DMA_TEI_CAPABLE = 0x02,
63};
64
65extern spinlock_t dma_spin_lock;
66
67struct dma_channel;
68
69struct dma_ops {
70 int (*request)(struct dma_channel *chan);
71 void (*free)(struct dma_channel *chan);
72
73 int (*get_residue)(struct dma_channel *chan);
74 int (*xfer)(struct dma_channel *chan);
75 int (*configure)(struct dma_channel *chan, unsigned long flags);
76 int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
77};
78
79struct dma_channel {
80 char dev_id[16]; /* unique name per DMAC of channel */
81
82 unsigned int chan; /* DMAC channel number */
83 unsigned int vchan; /* Virtual channel number */
84
85 unsigned int mode;
86 unsigned int count;
87
88 unsigned long sar;
89 unsigned long dar;
90
91 const char **caps;
92
93 unsigned long flags;
94 atomic_t busy;
95
96 wait_queue_head_t wait_queue;
97
98 struct sys_device dev;
99 void *priv_data;
100};
101
102struct dma_info {
103 struct platform_device *pdev;
104
105 const char *name;
106 unsigned int nr_channels;
107 unsigned long flags;
108
109 struct dma_ops *ops;
110 struct dma_channel *channels;
111
112 struct list_head list;
113 int first_channel_nr;
114 int first_vchannel_nr;
115};
116
117struct dma_chan_caps {
118 int ch_num;
119 const char **caplist;
120};
121
122#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
123
124/* arch/sh/drivers/dma/dma-api.c */
125extern int dma_xfer(unsigned int chan, unsigned long from,
126 unsigned long to, size_t size, unsigned int mode);
127
128#define dma_write(chan, from, to, size) \
129 dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
130#define dma_write_page(chan, from, to) \
131 dma_write(chan, from, to, PAGE_SIZE)
132
133#define dma_read(chan, from, to, size) \
134 dma_xfer(chan, from, to, size, DMA_MODE_READ)
135#define dma_read_page(chan, from, to) \
136 dma_read(chan, from, to, PAGE_SIZE)
137
138extern int request_dma_bycap(const char **dmac, const char **caps,
139 const char *dev_id);
140extern int request_dma(unsigned int chan, const char *dev_id);
141extern void free_dma(unsigned int chan);
142extern int get_dma_residue(unsigned int chan);
143extern struct dma_info *get_dma_info(unsigned int chan);
144extern struct dma_channel *get_dma_channel(unsigned int chan);
145extern void dma_wait_for_completion(unsigned int chan);
146extern void dma_configure_channel(unsigned int chan, unsigned long flags);
147
148extern int register_dmac(struct dma_info *info);
149extern void unregister_dmac(struct dma_info *info);
150extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
151
152extern int dma_extend(unsigned int chan, unsigned long op, void *param);
153extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
154
155/* arch/sh/drivers/dma/dma-sysfs.c */
156extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
157extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
158
159#ifdef CONFIG_PCI
160extern int isa_dma_bridge_buggy;
161#else
162#define isa_dma_bridge_buggy (0)
163#endif
164
165#endif /* __KERNEL__ */
166#endif /* __ASM_SH_DMA_H */