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  * @id:                 instance ID
  27  * @irq:                irq line
  28  * @regs:               memory mapped I/O space
  29  * @clk:                hclk clock
  30  * @dw:                 struct dw_dma that is filed by dw_dma_probe()
  31  * @pdata:              pointer to platform data
  32  */
  33 struct dw_dma_chip {
  34         struct device   *dev;
  35         int             id;
  36         int             irq;
  37         void __iomem    *regs;
  38         struct clk      *clk;
  39         struct dw_dma   *dw;
  40
  41         const struct dw_dma_platform_data       *pdata;
  42 };
  43
  44 /* Export to the platform drivers */
  45 #if IS_ENABLED(CONFIG_DW_DMAC_CORE)
  46 int dw_dma_probe(struct dw_dma_chip *chip);
  47 int dw_dma_remove(struct dw_dma_chip *chip);
  48 #else
  49 static inline int dw_dma_probe(struct dw_dma_chip *chip) { return -ENODEV; }
  50 static inline int dw_dma_remove(struct dw_dma_chip *chip) { return 0; }
  51 #endif /* CONFIG_DW_DMAC_CORE */
  52
  53 #endif /* _DMA_DW_H */