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9a7b8e0 @lyakh dmaengine: add an shdma-base library
lyakh authored
1 /*
2 * Dmaengine driver base library for DMA controllers, found on SH-based SoCs
3 *
4 * extracted from shdma.c and headers
5 *
6 * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
7 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
8 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
9 * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
10 *
11 * This is free software; you can redistribute it and/or modify
12 * it under the terms of version 2 of the GNU General Public License as
13 * published by the Free Software Foundation.
14 */
15
16 #ifndef SHDMA_BASE_H
17 #define SHDMA_BASE_H
18
19 #include <linux/dmaengine.h>
20 #include <linux/interrupt.h>
21 #include <linux/list.h>
22 #include <linux/types.h>
23
24 /**
25 * shdma_pm_state - DMA channel PM state
26 * SHDMA_PM_ESTABLISHED: either idle or during data transfer
27 * SHDMA_PM_BUSY: during the transfer preparation, when we have to
28 * drop the lock temporarily
29 * SHDMA_PM_PENDING: transfers pending
30 */
31 enum shdma_pm_state {
32 SHDMA_PM_ESTABLISHED,
33 SHDMA_PM_BUSY,
34 SHDMA_PM_PENDING,
35 };
36
37 struct device;
38
39 /*
40 * Drivers, using this library are expected to embed struct shdma_dev,
41 * struct shdma_chan, struct shdma_desc, and struct shdma_slave
42 * in their respective device, channel, descriptor and slave objects.
43 */
44
45 struct shdma_slave {
c2cdb7e @lyakh dma: sh: use an integer slave ID to improve API compatibility
lyakh authored
46 int slave_id;
9a7b8e0 @lyakh dmaengine: add an shdma-base library
lyakh authored
47 };
48
49 struct shdma_desc {
50 struct list_head node;
51 struct dma_async_tx_descriptor async_tx;
52 enum dma_transfer_direction direction;
4f46f8a @lyakh dmaengine: shdma: restore partial transfer calculation
lyakh authored
53 size_t partial;
9a7b8e0 @lyakh dmaengine: add an shdma-base library
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54 dma_cookie_t cookie;
55 int chunks;
56 int mark;
57 };
58
59 struct shdma_chan {
60 spinlock_t chan_lock; /* Channel operation lock */
61 struct list_head ld_queue; /* Link descriptors queue */
62 struct list_head ld_free; /* Free link descriptors */
63 struct dma_chan dma_chan; /* DMA channel */
64 struct device *dev; /* Channel device */
65 void *desc; /* buffer for descriptor array */
66 int desc_num; /* desc count */
67 size_t max_xfer_len; /* max transfer length */
68 int id; /* Raw id of this channel */
69 int irq; /* Channel IRQ */
c2cdb7e @lyakh dma: sh: use an integer slave ID to improve API compatibility
lyakh authored
70 int slave_id; /* Client ID for slave DMA */
9a7b8e0 @lyakh dmaengine: add an shdma-base library
lyakh authored
71 enum shdma_pm_state pm_state;
72 };
73
74 /**
75 * struct shdma_ops - simple DMA driver operations
76 * desc_completed: return true, if this is the descriptor, that just has
77 * completed (atomic)
78 * halt_channel: stop DMA channel operation (atomic)
79 * channel_busy: return true, if the channel is busy (atomic)
80 * slave_addr: return slave DMA address
81 * desc_setup: set up the hardware specific descriptor portion (atomic)
82 * set_slave: bind channel to a slave
83 * setup_xfer: configure channel hardware for operation (atomic)
84 * start_xfer: start the DMA transfer (atomic)
85 * embedded_desc: return Nth struct shdma_desc pointer from the
86 * descriptor array
87 * chan_irq: process channel IRQ, return true if a transfer has
88 * completed (atomic)
89 */
90 struct shdma_ops {
91 bool (*desc_completed)(struct shdma_chan *, struct shdma_desc *);
92 void (*halt_channel)(struct shdma_chan *);
93 bool (*channel_busy)(struct shdma_chan *);
94 dma_addr_t (*slave_addr)(struct shdma_chan *);
95 int (*desc_setup)(struct shdma_chan *, struct shdma_desc *,
96 dma_addr_t, dma_addr_t, size_t *);
1ff8df4 @lyakh dma: sh: provide a migration path for slave drivers to stop using .pr…
lyakh authored
97 int (*set_slave)(struct shdma_chan *, int, bool);
c2cdb7e @lyakh dma: sh: use an integer slave ID to improve API compatibility
lyakh authored
98 void (*setup_xfer)(struct shdma_chan *, int);
9a7b8e0 @lyakh dmaengine: add an shdma-base library
lyakh authored
99 void (*start_xfer)(struct shdma_chan *, struct shdma_desc *);
100 struct shdma_desc *(*embedded_desc)(void *, int);
101 bool (*chan_irq)(struct shdma_chan *, int);
4f46f8a @lyakh dmaengine: shdma: restore partial transfer calculation
lyakh authored
102 size_t (*get_partial)(struct shdma_chan *, struct shdma_desc *);
9a7b8e0 @lyakh dmaengine: add an shdma-base library
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103 };
104
105 struct shdma_dev {
106 struct dma_device dma_dev;
107 struct shdma_chan **schan;
108 const struct shdma_ops *ops;
109 size_t desc_size;
110 };
111
112 #define shdma_for_each_chan(c, d, i) for (i = 0, c = (d)->schan[0]; \
113 i < (d)->dma_dev.chancnt; c = (d)->schan[++i])
114
115 int shdma_request_irq(struct shdma_chan *, int,
116 unsigned long, const char *);
117 void shdma_free_irq(struct shdma_chan *);
118 bool shdma_reset(struct shdma_dev *sdev);
119 void shdma_chan_probe(struct shdma_dev *sdev,
120 struct shdma_chan *schan, int id);
121 void shdma_chan_remove(struct shdma_chan *schan);
122 int shdma_init(struct device *dev, struct shdma_dev *sdev,
123 int chan_num);
124 void shdma_cleanup(struct shdma_dev *sdev);
125
126 #endif
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