Current File : //usr/src/kernels/3.10.0-957.21.3.el7.centos.plus.x86_64/include/linux/platform_data/dma-dw.h
/*
* Driver for the Synopsys DesignWare DMA Controller
*
* Copyright (C) 2007 Atmel Corporation
* Copyright (C) 2010-2011 ST Microelectronics
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _PLATFORM_DATA_DMA_DW_H
#define _PLATFORM_DATA_DMA_DW_H
#include <linux/device.h>
#define DW_DMA_MAX_NR_MASTERS 4
/**
* struct dw_dma_slave - Controller-specific information about a slave
*
* @dma_dev: required DMA master device
* @src_id: src request line
* @dst_id: dst request line
* @src_master: src master for transfers on allocated channel.
* @dst_master: dest master for transfers on allocated channel.
*/
struct dw_dma_slave {
struct device *dma_dev;
u8 src_id;
u8 dst_id;
u8 src_master;
u8 dst_master;
};
/**
* struct dw_dma_platform_data - Controller configuration parameters
* @nr_channels: Number of channels supported by hardware (max 8)
* @is_private: The device channels should be marked as private and not for
* by the general purpose DMA channel allocator.
* @is_memcpy: The device channels do support memory-to-memory transfers.
* @chan_allocation_order: Allocate channels starting from 0 or 7
* @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
* @block_size: Maximum block size supported by the controller
* @nr_masters: Number of AHB masters supported by the controller
* @data_width: Maximum data width supported by hardware per AHB master
* (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
*/
struct dw_dma_platform_data {
unsigned int nr_channels;
bool is_private;
bool is_memcpy;
#define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */
#define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */
unsigned char chan_allocation_order;
#define CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */
#define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */
unsigned char chan_priority;
unsigned short block_size;
unsigned char nr_masters;
unsigned char data_width[DW_DMA_MAX_NR_MASTERS];
};
#endif /* _PLATFORM_DATA_DMA_DW_H */
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