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1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * include/asm-sh/dma.h
4 *
5 * Copyright (C) 2003, 2004 Paul Mundt
6 */
7#ifndef __ASM_SH_DMA_H
8#define __ASM_SH_DMA_H
9#ifdef __KERNEL__
10
11#include <linux/spinlock.h>
12#include <linux/wait.h>
13#include <linux/sched.h>
14#include <linux/device.h>
15#include <asm-generic/dma.h>
16
17/*
18 * Read and write modes can mean drastically different things depending on the
19 * channel configuration. Consult your DMAC documentation and module
20 * implementation for further clues.
21 */
22#define DMA_MODE_READ 0x00
23#define DMA_MODE_WRITE 0x01
24#define DMA_MODE_MASK 0x01
25
26#define DMA_AUTOINIT 0x10
27
28/*
29 * DMAC (dma_info) flags
30 */
31enum {
32 DMAC_CHANNELS_CONFIGURED = 0x01,
33 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */
34};
35
36/*
37 * DMA channel capabilities / flags
38 */
39enum {
40 DMA_CONFIGURED = 0x01,
41
42 /*
43 * Transfer end interrupt, inherited from DMAC.
44 * wait_queue used in dma_wait_for_completion.
45 */
46 DMA_TEI_CAPABLE = 0x02,
47};
48
49extern spinlock_t dma_spin_lock;
50
51struct dma_channel;
52
53struct dma_ops {
54 int (*request)(struct dma_channel *chan);
55 void (*free)(struct dma_channel *chan);
56
57 int (*get_residue)(struct dma_channel *chan);
58 int (*xfer)(struct dma_channel *chan);
59 int (*configure)(struct dma_channel *chan, unsigned long flags);
60 int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
61};
62
63struct dma_channel {
64 char dev_id[16]; /* unique name per DMAC of channel */
65
66 unsigned int chan; /* DMAC channel number */
67 unsigned int vchan; /* Virtual channel number */
68
69 unsigned int mode;
70 unsigned int count;
71
72 unsigned long sar;
73 unsigned long dar;
74
75 const char **caps;
76
77 unsigned long flags;
78 atomic_t busy;
79
80 wait_queue_head_t wait_queue;
81
82 struct device dev;
83 void *priv_data;
84};
85
86struct dma_info {
87 struct platform_device *pdev;
88
89 const char *name;
90 unsigned int nr_channels;
91 unsigned long flags;
92
93 struct dma_ops *ops;
94 struct dma_channel *channels;
95
96 struct list_head list;
97 int first_channel_nr;
98 int first_vchannel_nr;
99};
100
101struct dma_chan_caps {
102 int ch_num;
103 const char **caplist;
104};
105
106#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
107
108/* arch/sh/drivers/dma/dma-api.c */
109extern int dma_xfer(unsigned int chan, unsigned long from,
110 unsigned long to, size_t size, unsigned int mode);
111
112#define dma_write(chan, from, to, size) \
113 dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
114#define dma_write_page(chan, from, to) \
115 dma_write(chan, from, to, PAGE_SIZE)
116
117#define dma_read(chan, from, to, size) \
118 dma_xfer(chan, from, to, size, DMA_MODE_READ)
119#define dma_read_page(chan, from, to) \
120 dma_read(chan, from, to, PAGE_SIZE)
121
122extern int request_dma_bycap(const char **dmac, const char **caps,
123 const char *dev_id);
124extern int get_dma_residue(unsigned int chan);
125extern struct dma_info *get_dma_info(unsigned int chan);
126extern struct dma_channel *get_dma_channel(unsigned int chan);
127extern void dma_wait_for_completion(unsigned int chan);
128extern void dma_configure_channel(unsigned int chan, unsigned long flags);
129
130extern int register_dmac(struct dma_info *info);
131extern void unregister_dmac(struct dma_info *info);
132extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
133
134extern int dma_extend(unsigned int chan, unsigned long op, void *param);
135extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
136
137/* arch/sh/drivers/dma/dma-sysfs.c */
138extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
139extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
140
141#ifdef CONFIG_PCI
142extern int isa_dma_bridge_buggy;
143#else
144#define isa_dma_bridge_buggy (0)
145#endif
146
147#endif /* __KERNEL__ */
148#endif /* __ASM_SH_DMA_H */