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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/config.h>
15#include <linux/spinlock.h>
16#include <linux/wait.h>
17#include <linux/sysdev.h>
Paul Mundt0d831772006-01-16 22:14:09 -080018#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/cpu/dma.h>
20#include <asm/semaphore.h>
21
22/* The maximum address that we can perform a DMA transfer to on this platform */
23/* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
24 occurrence should be flagged as an error. */
25/* But... */
26/* XXX: This is not applicable to SuperH, just needed for alloc_bootmem */
27#define MAX_DMA_ADDRESS (PAGE_OFFSET+0x10000000)
28
29#ifdef CONFIG_NR_DMA_CHANNELS
30# define MAX_DMA_CHANNELS (CONFIG_NR_DMA_CHANNELS)
31#else
32# define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS)
33#endif
34
35/*
36 * Read and write modes can mean drastically different things depending on the
37 * channel configuration. Consult your DMAC documentation and module
38 * implementation for further clues.
39 */
40#define DMA_MODE_READ 0x00
41#define DMA_MODE_WRITE 0x01
42#define DMA_MODE_MASK 0x01
43
44#define DMA_AUTOINIT 0x10
45
46/*
47 * DMAC (dma_info) flags
48 */
49enum {
50 DMAC_CHANNELS_CONFIGURED = 0x00,
51 DMAC_CHANNELS_TEI_CAPABLE = 0x01,
52};
53
54/*
55 * DMA channel capabilities / flags
56 */
57enum {
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 DMA_TEI_CAPABLE = 0x01,
Paul Mundt0d831772006-01-16 22:14:09 -080059 DMA_CONFIGURED = 0x02,
Linus Torvalds1da177e2005-04-16 15:20:36 -070060};
61
62extern spinlock_t dma_spin_lock;
63
64struct dma_channel;
65
66struct dma_ops {
67 int (*request)(struct dma_channel *chan);
68 void (*free)(struct dma_channel *chan);
69
70 int (*get_residue)(struct dma_channel *chan);
71 int (*xfer)(struct dma_channel *chan);
72 void (*configure)(struct dma_channel *chan, unsigned long flags);
73};
74
75struct dma_channel {
76 char dev_id[16];
77
Paul Mundt0d831772006-01-16 22:14:09 -080078 unsigned int chan; /* Physical channel number */
79 unsigned int vchan; /* Virtual channel number */
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 unsigned int mode;
81 unsigned int count;
82
83 unsigned long sar;
84 unsigned long dar;
85
86 unsigned long flags;
87 atomic_t busy;
88
89 struct semaphore sem;
90 wait_queue_head_t wait_queue;
91
92 struct sys_device dev;
93};
94
95struct dma_info {
Paul Mundt0d831772006-01-16 22:14:09 -080096 struct platform_device *pdev;
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 const char *name;
99 unsigned int nr_channels;
100 unsigned long flags;
101
102 struct dma_ops *ops;
103 struct dma_channel *channels;
104
105 struct list_head list;
106};
107
108#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
109
110/* arch/sh/drivers/dma/dma-api.c */
111extern int dma_xfer(unsigned int chan, unsigned long from,
112 unsigned long to, size_t size, unsigned int mode);
113
114#define dma_write(chan, from, to, size) \
115 dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
116#define dma_write_page(chan, from, to) \
117 dma_write(chan, from, to, PAGE_SIZE)
118
119#define dma_read(chan, from, to, size) \
120 dma_xfer(chan, from, to, size, DMA_MODE_READ)
121#define dma_read_page(chan, from, to) \
122 dma_read(chan, from, to, PAGE_SIZE)
123
124extern int request_dma(unsigned int chan, const char *dev_id);
125extern void free_dma(unsigned int chan);
126extern int get_dma_residue(unsigned int chan);
127extern struct dma_info *get_dma_info(unsigned int chan);
128extern struct dma_channel *get_dma_channel(unsigned int chan);
129extern void dma_wait_for_completion(unsigned int chan);
130extern void dma_configure_channel(unsigned int chan, unsigned long flags);
131
132extern int register_dmac(struct dma_info *info);
133extern void unregister_dmac(struct dma_info *info);
134
135#ifdef CONFIG_SYSFS
136/* arch/sh/drivers/dma/dma-sysfs.c */
Paul Mundt0d831772006-01-16 22:14:09 -0800137extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
138extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
139#else
140#define dma_create_sysfs_file(channel, info) do { } while (0)
141#define dma_remove_sysfs_file(channel, info) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142#endif
143
144#ifdef CONFIG_PCI
145extern int isa_dma_bridge_buggy;
146#else
147#define isa_dma_bridge_buggy (0)
148#endif
149
150#endif /* __KERNEL__ */
151#endif /* __ASM_SH_DMA_H */