2 * Driver for the Synopsys DesignWare DMA Controller (aka DMACA on
5 * Copyright (C) 2007 Atmel Corporation
6 * Copyright (C) 2010-2011 ST Microelectronics
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
15 #include <linux/dmaengine.h>
18 * struct dw_dma_platform_data - Controller configuration parameters
19 * @nr_channels: Number of channels supported by hardware (max 8)
20 * @is_private: The device channels should be marked as private and not for
21 * by the general purpose DMA channel allocator.
22 * @chan_allocation_order: Allocate channels starting from 0 or 7
23 * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
24 * @block_size: Maximum block size supported by the controller
25 * @nr_masters: Number of AHB masters supported by the controller
26 * @data_width: Maximum data width supported by hardware per AHB master
27 * (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
29 struct dw_dma_platform_data {
30 unsigned int nr_channels;
32 #define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */
33 #define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */
34 unsigned char chan_allocation_order;
35 #define CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */
36 #define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */
37 unsigned char chan_priority;
38 unsigned short block_size;
39 unsigned char nr_masters;
40 unsigned char data_width[4];
56 * struct dw_dma_slave - Controller-specific information about a slave
58 * @dma_dev: required DMA master device
59 * @cfg_hi: Platform-specific initializer for the CFG_HI register
60 * @cfg_lo: Platform-specific initializer for the CFG_LO register
61 * @src_master: src master for transfers on allocated channel.
62 * @dst_master: dest master for transfers on allocated channel.
65 struct device *dma_dev;
72 /* Platform-configurable bits in CFG_HI */
73 #define DWC_CFGH_FCMODE (1 << 0)
74 #define DWC_CFGH_FIFO_MODE (1 << 1)
75 #define DWC_CFGH_PROTCTL(x) ((x) << 2)
76 #define DWC_CFGH_SRC_PER(x) ((x) << 7)
77 #define DWC_CFGH_DST_PER(x) ((x) << 11)
79 /* Platform-configurable bits in CFG_LO */
80 #define DWC_CFGL_LOCK_CH_XFER (0 << 12) /* scope of LOCK_CH */
81 #define DWC_CFGL_LOCK_CH_BLOCK (1 << 12)
82 #define DWC_CFGL_LOCK_CH_XACT (2 << 12)
83 #define DWC_CFGL_LOCK_BUS_XFER (0 << 14) /* scope of LOCK_BUS */
84 #define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14)
85 #define DWC_CFGL_LOCK_BUS_XACT (2 << 14)
86 #define DWC_CFGL_LOCK_CH (1 << 15) /* channel lockout */
87 #define DWC_CFGL_LOCK_BUS (1 << 16) /* busmaster lockout */
88 #define DWC_CFGL_HS_DST_POL (1 << 18) /* dst handshake active low */
89 #define DWC_CFGL_HS_SRC_POL (1 << 19) /* src handshake active low */
91 /* DMA API extensions */
92 struct dw_cyclic_desc {
93 struct dw_desc **desc;
94 unsigned long periods;
95 void (*period_callback)(void *param);
96 void *period_callback_param;
99 struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
100 dma_addr_t buf_addr, size_t buf_len, size_t period_len,
101 enum dma_transfer_direction direction);
102 void dw_dma_cyclic_free(struct dma_chan *chan);
103 int dw_dma_cyclic_start(struct dma_chan *chan);
104 void dw_dma_cyclic_stop(struct dma_chan *chan);
106 dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
108 dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
110 #endif /* DW_DMAC_H */