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
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
15enum 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 */
27struct 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 */
39struct s3c24xx_dma_platdata {
40	int num_phy_channels;
41	struct s3c24xx_dma_channel *channels;
42	int num_channels;
43};
44
45struct dma_chan;
46bool s3c24xx_dma_filter(struct dma_chan *chan, void *param);
47