2 * Driver for the Synopsys DesignWare DMA Controller
4 * Copyright (C) 2007 Atmel Corporation
5 * Copyright (C) 2010-2011 ST Microelectronics
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
14 #include <linux/dmaengine.h>
17 * struct dw_dma_slave - Controller-specific information about a slave
19 * @dma_dev: required DMA master device. Depricated.
20 * @src_id: src request line
21 * @dst_id: dst request line
22 * @src_master: src master for transfers on allocated channel.
23 * @dst_master: dest master for transfers on allocated channel.
26 struct device *dma_dev;
34 * struct dw_dma_platform_data - Controller configuration parameters
35 * @nr_channels: Number of channels supported by hardware (max 8)
36 * @is_private: The device channels should be marked as private and not for
37 * by the general purpose DMA channel allocator.
38 * @chan_allocation_order: Allocate channels starting from 0 or 7
39 * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
40 * @block_size: Maximum block size supported by the controller
41 * @nr_masters: Number of AHB masters supported by the controller
42 * @data_width: Maximum data width supported by hardware per AHB master
43 * (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
45 struct dw_dma_platform_data {
46 unsigned int nr_channels;
48 #define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */
49 #define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */
50 unsigned char chan_allocation_order;
51 #define CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */
52 #define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */
53 unsigned char chan_priority;
54 unsigned short block_size;
55 unsigned char nr_masters;
56 unsigned char data_width[4];
59 /* DMA API extensions */
60 struct dw_cyclic_desc {
61 struct dw_desc **desc;
62 unsigned long periods;
63 void (*period_callback)(void *param);
64 void *period_callback_param;
67 struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
68 dma_addr_t buf_addr, size_t buf_len, size_t period_len,
69 enum dma_transfer_direction direction);
70 void dw_dma_cyclic_free(struct dma_chan *chan);
71 int dw_dma_cyclic_start(struct dma_chan *chan);
72 void dw_dma_cyclic_stop(struct dma_chan *chan);
74 dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
76 dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
78 #endif /* DW_DMAC_H */