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 * @bus_id: name of this device channel, not just a device name since
21 * devices may have more than one channel e.g. "foo_tx"
22 * @cfg_hi: Platform-specific initializer for the CFG_HI register
23 * @cfg_lo: Platform-specific initializer for the CFG_LO register
24 * @src_master: src master for transfers on allocated channel.
25 * @dst_master: dest master for transfers on allocated channel.
28 struct device *dma_dev;
36 * struct dw_dma_platform_data - Controller configuration parameters
37 * @nr_channels: Number of channels supported by hardware (max 8)
38 * @is_private: The device channels should be marked as private and not for
39 * by the general purpose DMA channel allocator.
40 * @chan_allocation_order: Allocate channels starting from 0 or 7
41 * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
42 * @block_size: Maximum block size supported by the controller
43 * @nr_masters: Number of AHB masters supported by the controller
44 * @data_width: Maximum data width supported by hardware per AHB master
45 * (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
47 struct dw_dma_platform_data {
48 unsigned int nr_channels;
50 #define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */
51 #define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */
52 unsigned char chan_allocation_order;
53 #define CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */
54 #define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */
55 unsigned char chan_priority;
56 unsigned short block_size;
57 unsigned char nr_masters;
58 unsigned char data_width[4];
73 /* Platform-configurable bits in CFG_HI */
74 #define DWC_CFGH_FCMODE (1 << 0)
75 #define DWC_CFGH_FIFO_MODE (1 << 1)
76 #define DWC_CFGH_PROTCTL(x) ((x) << 2)
77 #define DWC_CFGH_SRC_PER(x) ((x) << 7)
78 #define DWC_CFGH_DST_PER(x) ((x) << 11)
80 /* Platform-configurable bits in CFG_LO */
81 #define DWC_CFGL_LOCK_CH_XFER (0 << 12) /* scope of LOCK_CH */
82 #define DWC_CFGL_LOCK_CH_BLOCK (1 << 12)
83 #define DWC_CFGL_LOCK_CH_XACT (2 << 12)
84 #define DWC_CFGL_LOCK_BUS_XFER (0 << 14) /* scope of LOCK_BUS */
85 #define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14)
86 #define DWC_CFGL_LOCK_BUS_XACT (2 << 14)
87 #define DWC_CFGL_LOCK_CH (1 << 15) /* channel lockout */
88 #define DWC_CFGL_LOCK_BUS (1 << 16) /* busmaster lockout */
89 #define DWC_CFGL_HS_DST_POL (1 << 18) /* dst handshake active low */
90 #define DWC_CFGL_HS_SRC_POL (1 << 19) /* src handshake active low */
92 /* DMA API extensions */
93 struct dw_cyclic_desc {
94 struct dw_desc **desc;
95 unsigned long periods;
96 void (*period_callback)(void *param);
97 void *period_callback_param;
100 struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
101 dma_addr_t buf_addr, size_t buf_len, size_t period_len,
102 enum dma_transfer_direction direction);
103 void dw_dma_cyclic_free(struct dma_chan *chan);
104 int dw_dma_cyclic_start(struct dma_chan *chan);
105 void dw_dma_cyclic_stop(struct dma_chan *chan);
107 dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
109 dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
111 #endif /* DW_DMAC_H */