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d8902adc NI |
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 | ||
d8902adc | 16 | #include <linux/dmaengine.h> |
3542a113 GL |
17 | #include <linux/interrupt.h> |
18 | #include <linux/list.h> | |
d8902adc NI |
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 { | |
d8902adc NI |
29 | struct sh_dmae_regs hw; |
30 | struct list_head node; | |
31 | struct dma_async_tx_descriptor async_tx; | |
cfefe997 | 32 | enum dma_data_direction direction; |
3542a113 GL |
33 | dma_cookie_t cookie; |
34 | int chunks; | |
d8902adc NI |
35 | int mark; |
36 | }; | |
37 | ||
3542a113 GL |
38 | struct device; |
39 | ||
d8902adc NI |
40 | struct sh_dmae_chan { |
41 | dma_cookie_t completed_cookie; /* The maximum cookie completed */ | |
86d61b33 GL |
42 | spinlock_t desc_lock; /* Descriptor operation lock */ |
43 | struct list_head ld_queue; /* Link descriptors queue */ | |
44 | struct list_head ld_free; /* Link descriptors free */ | |
45 | struct dma_chan common; /* DMA common channel */ | |
46 | struct device *dev; /* Channel device */ | |
d8902adc | 47 | struct tasklet_struct tasklet; /* Tasklet */ |
86d61b33 | 48 | int descs_allocated; /* desc count */ |
cfefe997 | 49 | int xmit_shift; /* log_2(bytes_per_xfer) */ |
d8902adc | 50 | int id; /* Raw id of this channel */ |
86d61b33 | 51 | char dev_id[16]; /* unique name per DMAC of channel */ |
d8902adc NI |
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 */ |