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9a7b8e00 GL |
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 { | |
c2cdb7e4 | 46 | int slave_id; |
9a7b8e00 GL |
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; | |
4f46f8ac | 53 | size_t partial; |
9a7b8e00 GL |
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 */ | |
c2cdb7e4 | 70 | int slave_id; /* Client ID for slave DMA */ |
9a7b8e00 GL |
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 *); | |
1ff8df4f | 97 | int (*set_slave)(struct shdma_chan *, int, bool); |
c2cdb7e4 | 98 | void (*setup_xfer)(struct shdma_chan *, int); |
9a7b8e00 GL |
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); | |
4f46f8ac | 102 | size_t (*get_partial)(struct shdma_chan *, struct shdma_desc *); |
9a7b8e00 GL |
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 |