include/linux/dma/dw.h

   1 /*
   2  * Driver for the Synopsys DesignWare DMA Controller
   3  *
   4  * Copyright (C) 2007 Atmel Corporation
   5  * Copyright (C) 2010-2011 ST Microelectronics
   6  * Copyright (C) 2014 Intel Corporation
   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 _DMA_DW_H
  13 #define _DMA_DW_H
  14
  15 #include <linux/clk.h>
  16 #include <linux/device.h>
  17 #include <linux/dmaengine.h>
  18
  19 #include <linux/platform_data/dma-dw.h>
  20
  21 struct dw_dma;
  22
  23 /**
  24  * struct dw_dma_chip - representation of DesignWare DMA controller hardware
  25  * @dev:                struct device of the DMA controller
  26  * @irq:                irq line
  27  * @regs:               memory mapped I/O space
  28  * @clk:                hclk clock
  29  * @dw:                 struct dw_dma that is filed by dw_dma_probe()
  30  * @pdata:              pointer to platform data
  31  */
  32 struct dw_dma_chip {
  33         struct device   *dev;
  34         int             irq;
  35         void __iomem    *regs;
  36         struct clk      *clk;
  37         struct dw_dma   *dw;
  38
  39         const struct dw_dma_platform_data       *pdata;
  40 };
  41
  42 /* Export to the platform drivers */
  43 #if IS_ENABLED(CONFIG_DW_DMAC_CORE)
  44 int dw_dma_probe(struct dw_dma_chip *chip);
  45 int dw_dma_remove(struct dw_dma_chip *chip);
  46 #else
  47 static inline int dw_dma_probe(struct dw_dma_chip *chip) { return -ENODEV; }
  48 static inline int dw_dma_remove(struct dw_dma_chip *chip) { return 0; }
  49 #endif /* CONFIG_DW_DMAC_CORE */
  50
  51 /* DMA API extensions */
  52 struct dw_desc;
  53
  54 struct dw_cyclic_desc {
  55         struct dw_desc  **desc;
  56         unsigned long   periods;
  57         void            (*period_callback)(void *param);
  58         void            *period_callback_param;
  59 };
  60
  61 struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
  62                 dma_addr_t buf_addr, size_t buf_len, size_t period_len,
  63                 enum dma_transfer_direction direction);
  64 void dw_dma_cyclic_free(struct dma_chan *chan);
  65 int dw_dma_cyclic_start(struct dma_chan *chan);
  66 void dw_dma_cyclic_stop(struct dma_chan *chan);
  67
  68 dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
  69
  70 dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
  71
  72 #endif /* _DMA_DW_H */