linux/include/linux/dw_dmac.h
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   1/*
   2 * Driver for the Synopsys DesignWare DMA Controller (aka DMACA on
   3 * AVR32 systems.)
   4 *
   5 * Copyright (C) 2007 Atmel Corporation
   6 * Copyright (C) 2010-2011 ST Microelectronics
   7 *
   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.
  11 */
  12#ifndef DW_DMAC_H
  13#define DW_DMAC_H
  14
  15#include <linux/dmaengine.h>
  16
  17/**
  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 * @block_size: Maximum block size supported by the controller
  23 * @nr_masters: Number of AHB masters supported by the controller
  24 * @data_width: Maximum data width supported by hardware per AHB master
  25 *              (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
  26 */
  27struct dw_dma_platform_data {
  28        unsigned int    nr_channels;
  29        bool            is_private;
  30#define CHAN_ALLOCATION_ASCENDING       0       /* zero to seven */
  31#define CHAN_ALLOCATION_DESCENDING      1       /* seven to zero */
  32        unsigned char   chan_allocation_order;
  33#define CHAN_PRIORITY_ASCENDING         0       /* chan0 highest */
  34#define CHAN_PRIORITY_DESCENDING        1       /* chan7 highest */
  35        unsigned char   chan_priority;
  36        unsigned short  block_size;
  37        unsigned char   nr_masters;
  38        unsigned char   data_width[4];
  39};
  40
  41/* bursts size */
  42enum dw_dma_msize {
  43        DW_DMA_MSIZE_1,
  44        DW_DMA_MSIZE_4,
  45        DW_DMA_MSIZE_8,
  46        DW_DMA_MSIZE_16,
  47        DW_DMA_MSIZE_32,
  48        DW_DMA_MSIZE_64,
  49        DW_DMA_MSIZE_128,
  50        DW_DMA_MSIZE_256,
  51};
  52
  53/**
  54 * struct dw_dma_slave - Controller-specific information about a slave
  55 *
  56 * @dma_dev: required DMA master device
  57 * @cfg_hi: Platform-specific initializer for the CFG_HI register
  58 * @cfg_lo: Platform-specific initializer for the CFG_LO register
  59 * @src_master: src master for transfers on allocated channel.
  60 * @dst_master: dest master for transfers on allocated channel.
  61 */
  62struct dw_dma_slave {
  63        struct device           *dma_dev;
  64        u32                     cfg_hi;
  65        u32                     cfg_lo;
  66        u8                      src_master;
  67        u8                      dst_master;
  68};
  69
  70/* Platform-configurable bits in CFG_HI */
  71#define DWC_CFGH_FCMODE         (1 << 0)
  72#define DWC_CFGH_FIFO_MODE      (1 << 1)
  73#define DWC_CFGH_PROTCTL(x)     ((x) << 2)
  74#define DWC_CFGH_SRC_PER(x)     ((x) << 7)
  75#define DWC_CFGH_DST_PER(x)     ((x) << 11)
  76
  77/* Platform-configurable bits in CFG_LO */
  78#define DWC_CFGL_LOCK_CH_XFER   (0 << 12)       /* scope of LOCK_CH */
  79#define DWC_CFGL_LOCK_CH_BLOCK  (1 << 12)
  80#define DWC_CFGL_LOCK_CH_XACT   (2 << 12)
  81#define DWC_CFGL_LOCK_BUS_XFER  (0 << 14)       /* scope of LOCK_BUS */
  82#define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14)
  83#define DWC_CFGL_LOCK_BUS_XACT  (2 << 14)
  84#define DWC_CFGL_LOCK_CH        (1 << 15)       /* channel lockout */
  85#define DWC_CFGL_LOCK_BUS       (1 << 16)       /* busmaster lockout */
  86#define DWC_CFGL_HS_DST_POL     (1 << 18)       /* dst handshake active low */
  87#define DWC_CFGL_HS_SRC_POL     (1 << 19)       /* src handshake active low */
  88
  89/* DMA API extensions */
  90struct dw_cyclic_desc {
  91        struct dw_desc  **desc;
  92        unsigned long   periods;
  93        void            (*period_callback)(void *param);
  94        void            *period_callback_param;
  95};
  96
  97struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
  98                dma_addr_t buf_addr, size_t buf_len, size_t period_len,
  99                enum dma_transfer_direction direction);
 100void dw_dma_cyclic_free(struct dma_chan *chan);
 101int dw_dma_cyclic_start(struct dma_chan *chan);
 102void dw_dma_cyclic_stop(struct dma_chan *chan);
 103
 104dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
 105
 106dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
 107
 108#endif /* DW_DMAC_H */
 109
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