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