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_slave - Controller-specific information about a slave
  19 *
  20 * @dma_dev: required DMA master device. Depricated.
  21 * @bus_id: name of this device channel, not just a device name since
  22 *          devices may have more than one channel e.g. "foo_tx"
  23 * @cfg_hi: Platform-specific initializer for the CFG_HI register
  24 * @cfg_lo: Platform-specific initializer for the CFG_LO register
  25 * @src_master: src master for transfers on allocated channel.
  26 * @dst_master: dest master for transfers on allocated channel.
  27 */
  28struct dw_dma_slave {
  29        struct device           *dma_dev;
  30        u32                     cfg_hi;
  31        u32                     cfg_lo;
  32        u8                      src_master;
  33        u8                      dst_master;
  34};
  35
  36/**
  37 * struct dw_dma_platform_data - Controller configuration parameters
  38 * @nr_channels: Number of channels supported by hardware (max 8)
  39 * @is_private: The device channels should be marked as private and not for
  40 *      by the general purpose DMA channel allocator.
  41 * @chan_allocation_order: Allocate channels starting from 0 or 7
  42 * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
  43 * @block_size: Maximum block size supported by the controller
  44 * @nr_masters: Number of AHB masters supported by the controller
  45 * @data_width: Maximum data width supported by hardware per AHB master
  46 *              (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
  47 * @sd: slave specific data. Used for configuring channels
  48 * @sd_count: count of slave data structures passed.
  49 */
  50struct dw_dma_platform_data {
  51        unsigned int    nr_channels;
  52        bool            is_private;
  53#define CHAN_ALLOCATION_ASCENDING       0       /* zero to seven */
  54#define CHAN_ALLOCATION_DESCENDING      1       /* seven to zero */
  55        unsigned char   chan_allocation_order;
  56#define CHAN_PRIORITY_ASCENDING         0       /* chan0 highest */
  57#define CHAN_PRIORITY_DESCENDING        1       /* chan7 highest */
  58        unsigned char   chan_priority;
  59        unsigned short  block_size;
  60        unsigned char   nr_masters;
  61        unsigned char   data_width[4];
  62};
  63
  64/* bursts size */
  65enum dw_dma_msize {
  66        DW_DMA_MSIZE_1,
  67        DW_DMA_MSIZE_4,
  68        DW_DMA_MSIZE_8,
  69        DW_DMA_MSIZE_16,
  70        DW_DMA_MSIZE_32,
  71        DW_DMA_MSIZE_64,
  72        DW_DMA_MSIZE_128,
  73        DW_DMA_MSIZE_256,
  74};
  75
  76/* Platform-configurable bits in CFG_HI */
  77#define DWC_CFGH_FCMODE         (1 << 0)
  78#define DWC_CFGH_FIFO_MODE      (1 << 1)
  79#define DWC_CFGH_PROTCTL(x)     ((x) << 2)
  80#define DWC_CFGH_SRC_PER(x)     ((x) << 7)
  81#define DWC_CFGH_DST_PER(x)     ((x) << 11)
  82
  83/* Platform-configurable bits in CFG_LO */
  84#define DWC_CFGL_LOCK_CH_XFER   (0 << 12)       /* scope of LOCK_CH */
  85#define DWC_CFGL_LOCK_CH_BLOCK  (1 << 12)
  86#define DWC_CFGL_LOCK_CH_XACT   (2 << 12)
  87#define DWC_CFGL_LOCK_BUS_XFER  (0 << 14)       /* scope of LOCK_BUS */
  88#define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14)
  89#define DWC_CFGL_LOCK_BUS_XACT  (2 << 14)
  90#define DWC_CFGL_LOCK_CH        (1 << 15)       /* channel lockout */
  91#define DWC_CFGL_LOCK_BUS       (1 << 16)       /* busmaster lockout */
  92#define DWC_CFGL_HS_DST_POL     (1 << 18)       /* dst handshake active low */
  93#define DWC_CFGL_HS_SRC_POL     (1 << 19)       /* src handshake active low */
  94
  95/* DMA API extensions */
  96struct dw_cyclic_desc {
  97        struct dw_desc  **desc;
  98        unsigned long   periods;
  99        void            (*period_callback)(void *param);
 100        void            *period_callback_param;
 101};
 102
 103struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
 104                dma_addr_t buf_addr, size_t buf_len, size_t period_len,
 105                enum dma_transfer_direction direction);
 106void dw_dma_cyclic_free(struct dma_chan *chan);
 107int dw_dma_cyclic_start(struct dma_chan *chan);
 108void dw_dma_cyclic_stop(struct dma_chan *chan);
 109
 110dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
 111
 112dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
 113
 114#endif /* DW_DMAC_H */
 115
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