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/*
* 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 */
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