[mirror_ubuntu-artful-kernel.git] / include / linux / platform_data / dma-s3c24xx.h

/*
 * S3C24XX DMA handling
 *
 * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

/* Helper to encode the source selection constraints for early s3c socs. */
#define S3C24XX_DMA_CHANREQ(src, chan)	((BIT(3) | src) << chan * 4)

enum s3c24xx_dma_bus {
	S3C24XX_DMA_APB,
	S3C24XX_DMA_AHB,
};

/**
 * @bus: on which bus does the peripheral reside - AHB or APB.
 * @handshake: is a handshake with the peripheral necessary
 * @chansel: channel selection information, depending on variant; reqsel for
 *	     s3c2443 and later and channel-selection map for earlier SoCs
 *	     see CHANSEL doc in s3c2443-dma.c
 */
struct s3c24xx_dma_channel {
	enum s3c24xx_dma_bus bus;
	bool handshake;
	u16 chansel;
};

/**
 * struct s3c24xx_dma_platdata - platform specific settings
 * @num_phy_channels: number of physical channels
 * @channels: array of virtual channel descriptions
 * @num_channels: number of virtual channels
 */
struct s3c24xx_dma_platdata {
	int num_phy_channels;
	struct s3c24xx_dma_channel *channels;
	int num_channels;
};

struct dma_chan;
bool s3c24xx_dma_filter(struct dma_chan *chan, void *param);
Commit	Line	Data
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);