include/linux/dw_dmac.h

   1 /*
   2  * Driver for the Synopsys DesignWare DMA Controller (aka DMACA on
   3  * AVR32 systems.)
   4  *
   5  * Copyright (C) 2007 Atmel Corporation
   6  *
   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.
  10  */
  11 #ifndef DW_DMAC_H
  12 #define DW_DMAC_H
  13
  14 #include <linux/dmaengine.h>
  15
  16 /**
  17  * struct dw_dma_platform_data - Controller configuration parameters
  18  * @nr_channels: Number of channels supported by hardware (max 8)
  19  * @is_private: The device channels should be marked as private and not for
  20  *      by the general purpose DMA channel allocator.
  21  */
  22 struct dw_dma_platform_data {
  23         unsigned int    nr_channels;
  24         bool            is_private;
  25 #define CHAN_ALLOCATION_ASCENDING       0       /* zero to seven */
  26 #define CHAN_ALLOCATION_DESCENDING      1       /* seven to zero */
  27         unsigned char   chan_allocation_order;
  28 };
  29
  30 /**
  31  * enum dw_dma_slave_width - DMA slave register access width.
  32  * @DMA_SLAVE_WIDTH_8BIT: Do 8-bit slave register accesses
  33  * @DMA_SLAVE_WIDTH_16BIT: Do 16-bit slave register accesses
  34  * @DMA_SLAVE_WIDTH_32BIT: Do 32-bit slave register accesses
  35  */
  36 enum dw_dma_slave_width {
  37         DW_DMA_SLAVE_WIDTH_8BIT,
  38         DW_DMA_SLAVE_WIDTH_16BIT,
  39         DW_DMA_SLAVE_WIDTH_32BIT,
  40 };
  41
  42 /**
  43  * struct dw_dma_slave - Controller-specific information about a slave
  44  *
  45  * @dma_dev: required DMA master device
  46  * @tx_reg: physical address of data register used for
  47  *      memory-to-peripheral transfers
  48  * @rx_reg: physical address of data register used for
  49  *      peripheral-to-memory transfers
  50  * @reg_width: peripheral register width
  51  * @cfg_hi: Platform-specific initializer for the CFG_HI register
  52  * @cfg_lo: Platform-specific initializer for the CFG_LO register
  53  */
  54 struct dw_dma_slave {
  55         struct device           *dma_dev;
  56         dma_addr_t              tx_reg;
  57         dma_addr_t              rx_reg;
  58         enum dw_dma_slave_width reg_width;
  59         u32                     cfg_hi;
  60         u32                     cfg_lo;
  61         int                     src_master;
  62         int                     dst_master;
  63 };
  64
  65 /* Platform-configurable bits in CFG_HI */
  66 #define DWC_CFGH_FCMODE         (1 << 0)
  67 #define DWC_CFGH_FIFO_MODE      (1 << 1)
  68 #define DWC_CFGH_PROTCTL(x)     ((x) << 2)
  69 #define DWC_CFGH_SRC_PER(x)     ((x) << 7)
  70 #define DWC_CFGH_DST_PER(x)     ((x) << 11)
  71
  72 /* Platform-configurable bits in CFG_LO */
  73 #define DWC_CFGL_PRIO(x)        ((x) << 5)      /* priority */
  74 #define DWC_CFGL_LOCK_CH_XFER   (0 << 12)       /* scope of LOCK_CH */
  75 #define DWC_CFGL_LOCK_CH_BLOCK  (1 << 12)
  76 #define DWC_CFGL_LOCK_CH_XACT   (2 << 12)
  77 #define DWC_CFGL_LOCK_BUS_XFER  (0 << 14)       /* scope of LOCK_BUS */
  78 #define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14)
  79 #define DWC_CFGL_LOCK_BUS_XACT  (2 << 14)
  80 #define DWC_CFGL_LOCK_CH        (1 << 15)       /* channel lockout */
  81 #define DWC_CFGL_LOCK_BUS       (1 << 16)       /* busmaster lockout */
  82 #define DWC_CFGL_HS_DST_POL     (1 << 18)       /* dst handshake active low */
  83 #define DWC_CFGL_HS_SRC_POL     (1 << 19)       /* src handshake active low */
  84
  85 /* DMA API extensions */
  86 struct dw_cyclic_desc {
  87         struct dw_desc  **desc;
  88         unsigned long   periods;
  89         void            (*period_callback)(void *param);
  90         void            *period_callback_param;
  91 };
  92
  93 struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
  94                 dma_addr_t buf_addr, size_t buf_len, size_t period_len,
  95                 enum dma_data_direction direction);
  96 void dw_dma_cyclic_free(struct dma_chan *chan);
  97 int dw_dma_cyclic_start(struct dma_chan *chan);
  98 void dw_dma_cyclic_stop(struct dma_chan *chan);
  99
 100 dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
 101
 102 dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
 103
 104 #endif /* DW_DMAC_H */