115 строки
3.8 KiB
C
115 строки
3.8 KiB
C
/*
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* Driver for the Synopsys DesignWare DMA Controller (aka DMACA on
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* AVR32 systems.)
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*
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* Copyright (C) 2007 Atmel Corporation
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* Copyright (C) 2010-2011 ST Microelectronics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef DW_DMAC_H
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#define DW_DMAC_H
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#include <linux/dmaengine.h>
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/**
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* struct dw_dma_slave - Controller-specific information about a slave
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*
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* @dma_dev: required DMA master device. Depricated.
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* @bus_id: name of this device channel, not just a device name since
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* devices may have more than one channel e.g. "foo_tx"
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* @cfg_hi: Platform-specific initializer for the CFG_HI register
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* @cfg_lo: Platform-specific initializer for the CFG_LO register
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* @src_master: src master for transfers on allocated channel.
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* @dst_master: dest master for transfers on allocated channel.
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*/
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struct dw_dma_slave {
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struct device *dma_dev;
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u32 cfg_hi;
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u32 cfg_lo;
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u8 src_master;
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u8 dst_master;
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};
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/**
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* struct dw_dma_platform_data - Controller configuration parameters
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* @nr_channels: Number of channels supported by hardware (max 8)
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* @is_private: The device channels should be marked as private and not for
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* by the general purpose DMA channel allocator.
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* @chan_allocation_order: Allocate channels starting from 0 or 7
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* @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
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* @block_size: Maximum block size supported by the controller
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* @nr_masters: Number of AHB masters supported by the controller
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* @data_width: Maximum data width supported by hardware per AHB master
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* (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
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* @sd: slave specific data. Used for configuring channels
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* @sd_count: count of slave data structures passed.
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*/
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struct dw_dma_platform_data {
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unsigned int nr_channels;
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bool is_private;
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#define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */
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#define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */
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unsigned char chan_allocation_order;
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#define CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */
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#define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */
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unsigned char chan_priority;
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unsigned short block_size;
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unsigned char nr_masters;
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unsigned char data_width[4];
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};
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/* bursts size */
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enum dw_dma_msize {
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DW_DMA_MSIZE_1,
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DW_DMA_MSIZE_4,
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DW_DMA_MSIZE_8,
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DW_DMA_MSIZE_16,
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DW_DMA_MSIZE_32,
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DW_DMA_MSIZE_64,
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DW_DMA_MSIZE_128,
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DW_DMA_MSIZE_256,
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};
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/* Platform-configurable bits in CFG_HI */
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#define DWC_CFGH_FCMODE (1 << 0)
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#define DWC_CFGH_FIFO_MODE (1 << 1)
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#define DWC_CFGH_PROTCTL(x) ((x) << 2)
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#define DWC_CFGH_SRC_PER(x) ((x) << 7)
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#define DWC_CFGH_DST_PER(x) ((x) << 11)
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/* Platform-configurable bits in CFG_LO */
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#define DWC_CFGL_LOCK_CH_XFER (0 << 12) /* scope of LOCK_CH */
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#define DWC_CFGL_LOCK_CH_BLOCK (1 << 12)
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#define DWC_CFGL_LOCK_CH_XACT (2 << 12)
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#define DWC_CFGL_LOCK_BUS_XFER (0 << 14) /* scope of LOCK_BUS */
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#define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14)
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#define DWC_CFGL_LOCK_BUS_XACT (2 << 14)
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#define DWC_CFGL_LOCK_CH (1 << 15) /* channel lockout */
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#define DWC_CFGL_LOCK_BUS (1 << 16) /* busmaster lockout */
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#define DWC_CFGL_HS_DST_POL (1 << 18) /* dst handshake active low */
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#define DWC_CFGL_HS_SRC_POL (1 << 19) /* src handshake active low */
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/* DMA API extensions */
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struct dw_cyclic_desc {
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struct dw_desc **desc;
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unsigned long periods;
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void (*period_callback)(void *param);
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void *period_callback_param;
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};
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struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
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dma_addr_t buf_addr, size_t buf_len, size_t period_len,
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enum dma_transfer_direction direction);
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void dw_dma_cyclic_free(struct dma_chan *chan);
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int dw_dma_cyclic_start(struct dma_chan *chan);
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void dw_dma_cyclic_stop(struct dma_chan *chan);
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dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
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dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
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#endif /* DW_DMAC_H */
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