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1 | /* |
2 | * Renesas SuperH DMA Engine support |
3 | * |
4 | * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> |
5 | * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. |
6 | * |
7 | * This is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | * |
12 | */ |
13 | #ifndef __DMA_SHDMA_H |
14 | #define __DMA_SHDMA_H |
15 | |
16 | #include <linux/device.h> |
17 | #include <linux/dmapool.h> |
18 | #include <linux/dmaengine.h> |
19 | |
20 | #define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */ |
21 | |
22 | struct sh_dmae_regs { |
23 | u32 sar; /* SAR / source address */ |
24 | u32 dar; /* DAR / destination address */ |
25 | u32 tcr; /* TCR / transfer count */ |
26 | }; |
27 | |
28 | struct sh_desc { |
29 | struct list_head tx_list; |
30 | struct sh_dmae_regs hw; |
31 | struct list_head node; |
32 | struct dma_async_tx_descriptor async_tx; |
33 | int mark; |
34 | }; |
35 | |
36 | struct sh_dmae_chan { |
37 | dma_cookie_t completed_cookie; /* The maximum cookie completed */ |
38 | spinlock_t desc_lock; /* Descriptor operation lock */ |
39 | struct list_head ld_queue; /* Link descriptors queue */ |
40 | struct list_head ld_free; /* Link descriptors free */ |
41 | struct dma_chan common; /* DMA common channel */ |
42 | struct device *dev; /* Channel device */ |
43 | struct tasklet_struct tasklet; /* Tasklet */ |
44 | int descs_allocated; /* desc count */ |
45 | int id; /* Raw id of this channel */ |
46 | char dev_id[16]; /* unique name per DMAC of channel */ |
47 | |
48 | /* Set chcr */ |
49 | int (*set_chcr)(struct sh_dmae_chan *sh_chan, u32 regs); |
50 | /* Set DMA resource */ |
51 | int (*set_dmars)(struct sh_dmae_chan *sh_chan, u16 res); |
52 | }; |
53 | |
54 | struct sh_dmae_device { |
55 | struct dma_device common; |
56 | struct sh_dmae_chan *chan[MAX_DMA_CHANNELS]; |
57 | struct sh_dmae_pdata pdata; |
58 | }; |
59 | |
60 | #define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common) |
61 | #define to_sh_desc(lh) container_of(lh, struct sh_desc, node) |
62 | #define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx) |
63 | |
64 | #endif /* __DMA_SHDMA_H */ |
65 |
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