linux-stable-rt/arch/arm/mach-at91/include/mach/at_hdmac.h

/*
 * Header file for the Atmel AHB DMA Controller driver
 *
 * Copyright (C) 2008 Atmel Corporation
 *
 * 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.
 */
#ifndef AT_HDMAC_H
#define AT_HDMAC_H

#include <linux/dmaengine.h>

/**
 * struct at_dma_platform_data - Controller configuration parameters
 * @nr_channels: Number of channels supported by hardware (max 8)
 * @cap_mask: dma_capability flags supported by the platform
 */
struct at_dma_platform_data {
	unsigned int	nr_channels;
	dma_cap_mask_t  cap_mask;
};

/**
 * enum at_dma_slave_width - DMA slave register access width.
 * @AT_DMA_SLAVE_WIDTH_8BIT: Do 8-bit slave register accesses
 * @AT_DMA_SLAVE_WIDTH_16BIT: Do 16-bit slave register accesses
 * @AT_DMA_SLAVE_WIDTH_32BIT: Do 32-bit slave register accesses
 */
enum at_dma_slave_width {
	AT_DMA_SLAVE_WIDTH_8BIT = 0,
	AT_DMA_SLAVE_WIDTH_16BIT,
	AT_DMA_SLAVE_WIDTH_32BIT,
};

/**
 * struct at_dma_slave - Controller-specific information about a slave
 * @dma_dev: required DMA master device
 * @tx_reg: physical address of data register used for
 *	memory-to-peripheral transfers
 * @rx_reg: physical address of data register used for
 *	peripheral-to-memory transfers
 * @reg_width: peripheral register width
 * @cfg: Platform-specific initializer for the CFG register
 * @ctrla: Platform-specific initializer for the CTRLA register
 */
struct at_dma_slave {
	struct device		*dma_dev;
	dma_addr_t		tx_reg;
	dma_addr_t		rx_reg;
	enum at_dma_slave_width	reg_width;
	u32			cfg;
	u32			ctrla;
};


/* Platform-configurable bits in CFG */
#define	ATC_SRC_PER(h)		(0xFU & (h))	/* Channel src rq associated with periph handshaking ifc h */
#define	ATC_DST_PER(h)		((0xFU & (h)) <<  4)	/* Channel dst rq associated with periph handshaking ifc h */
#define	ATC_SRC_REP		(0x1 <<  8)	/* Source Replay Mod */
#define	ATC_SRC_H2SEL		(0x1 <<  9)	/* Source Handshaking Mod */
#define		ATC_SRC_H2SEL_SW	(0x0 <<  9)
#define		ATC_SRC_H2SEL_HW	(0x1 <<  9)
#define	ATC_DST_REP		(0x1 << 12)	/* Destination Replay Mod */
#define	ATC_DST_H2SEL		(0x1 << 13)	/* Destination Handshaking Mod */
#define		ATC_DST_H2SEL_SW	(0x0 << 13)
#define		ATC_DST_H2SEL_HW	(0x1 << 13)
#define	ATC_SOD			(0x1 << 16)	/* Stop On Done */
#define	ATC_LOCK_IF		(0x1 << 20)	/* Interface Lock */
#define	ATC_LOCK_B		(0x1 << 21)	/* AHB Bus Lock */
#define	ATC_LOCK_IF_L		(0x1 << 22)	/* Master Interface Arbiter Lock */
#define		ATC_LOCK_IF_L_CHUNK	(0x0 << 22)
#define		ATC_LOCK_IF_L_BUFFER	(0x1 << 22)
#define	ATC_AHB_PROT_MASK	(0x7 << 24)	/* AHB Protection */
#define	ATC_FIFOCFG_MASK	(0x3 << 28)	/* FIFO Request Configuration */
#define		ATC_FIFOCFG_LARGESTBURST	(0x0 << 28)
#define		ATC_FIFOCFG_HALFFIFO		(0x1 << 28)
#define		ATC_FIFOCFG_ENOUGHSPACE		(0x2 << 28)

/* Platform-configurable bits in CTRLA */
#define	ATC_SCSIZE_MASK		(0x7 << 16)	/* Source Chunk Transfer Size */
#define		ATC_SCSIZE_1		(0x0 << 16)
#define		ATC_SCSIZE_4		(0x1 << 16)
#define		ATC_SCSIZE_8		(0x2 << 16)
#define		ATC_SCSIZE_16		(0x3 << 16)
#define		ATC_SCSIZE_32		(0x4 << 16)
#define		ATC_SCSIZE_64		(0x5 << 16)
#define		ATC_SCSIZE_128		(0x6 << 16)
#define		ATC_SCSIZE_256		(0x7 << 16)
#define	ATC_DCSIZE_MASK		(0x7 << 20)	/* Destination Chunk Transfer Size */
#define		ATC_DCSIZE_1		(0x0 << 20)
#define		ATC_DCSIZE_4		(0x1 << 20)
#define		ATC_DCSIZE_8		(0x2 << 20)
#define		ATC_DCSIZE_16		(0x3 << 20)
#define		ATC_DCSIZE_32		(0x4 << 20)
#define		ATC_DCSIZE_64		(0x5 << 20)
#define		ATC_DCSIZE_128		(0x6 << 20)
#define		ATC_DCSIZE_256		(0x7 << 20)

#endif /* AT_HDMAC_H */