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ddeccb8d HS |
1 | /* |
2 | * S3C24XX DMA handling | |
3 | * | |
4 | * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | */ | |
11 | ||
1fecf895 HS |
12 | /* Helper to encode the source selection constraints for early s3c socs. */ |
13 | #define S3C24XX_DMA_CHANREQ(src, chan) ((BIT(3) | src) << chan * 4) | |
14 | ||
ddeccb8d HS |
15 | enum s3c24xx_dma_bus { |
16 | S3C24XX_DMA_APB, | |
17 | S3C24XX_DMA_AHB, | |
18 | }; | |
19 | ||
20 | /** | |
21 | * @bus: on which bus does the peripheral reside - AHB or APB. | |
22 | * @handshake: is a handshake with the peripheral necessary | |
23 | * @chansel: channel selection information, depending on variant; reqsel for | |
24 | * s3c2443 and later and channel-selection map for earlier SoCs | |
25 | * see CHANSEL doc in s3c2443-dma.c | |
26 | */ | |
27 | struct s3c24xx_dma_channel { | |
28 | enum s3c24xx_dma_bus bus; | |
29 | bool handshake; | |
30 | u16 chansel; | |
31 | }; | |
32 | ||
33 | /** | |
34 | * struct s3c24xx_dma_platdata - platform specific settings | |
35 | * @num_phy_channels: number of physical channels | |
36 | * @channels: array of virtual channel descriptions | |
37 | * @num_channels: number of virtual channels | |
38 | */ | |
39 | struct s3c24xx_dma_platdata { | |
40 | int num_phy_channels; | |
41 | struct s3c24xx_dma_channel *channels; | |
42 | int num_channels; | |
43 | }; | |
44 | ||
45 | struct dma_chan; | |
46 | bool s3c24xx_dma_filter(struct dma_chan *chan, void *param); |