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dw.h

dw.h 1.4 KB
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  1. /*
    2. 

  2.  * Driver for the Synopsys DesignWare DMA Controller
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 2007 Atmel Corporation
    5. 

  5.  * Copyright (C) 2010-2011 ST Microelectronics
    6. 

  6.  * Copyright (C) 2014 Intel Corporation
    7. 

  7.  *
    8. 

  8.  * This program is free software; you can redistribute it and/or modify
    9. 

  9.  * it under the terms of the GNU General Public License version 2 as
    10. 

  10.  * published by the Free Software Foundation.
    11. 

  11.  */
    12. 

  12. #ifndef _DMA_DW_H
    13. 

  13. #define _DMA_DW_H
    14. 

  14. 

  15. #include <linux/clk.h>
    16. 

  16. #include <linux/device.h>
    17. 

  17. #include <linux/dmaengine.h>
    18. 

  18. 

  19. #include <linux/platform_data/dma-dw.h>
    20. 

  20. 

  21. struct dw_dma;
    22. 

  22. 

  23. /**
    24. 

  24.  * struct dw_dma_chip - representation of DesignWare DMA controller hardware
    25. 

  25.  * @dev:		struct device of the DMA controller
    26. 

  26.  * @id:			instance ID
    27. 

  27.  * @irq:		irq line
    28. 

  28.  * @regs:		memory mapped I/O space
    29. 

  29.  * @clk:		hclk clock
    30. 

  30.  * @dw:			struct dw_dma that is filed by dw_dma_probe()
    31. 

  31.  * @pdata:		pointer to platform data
    32. 

  32.  */
    33. 

  33. struct dw_dma_chip {
    34. 

  34. 	struct device	*dev;
    35. 

  35. 	int		id;
    36. 

  36. 	int		irq;
    37. 

  37. 	void __iomem	*regs;
    38. 

  38. 	struct clk	*clk;
    39. 

  39. 	struct dw_dma	*dw;
    40. 

  40. 

  41. 	const struct dw_dma_platform_data	*pdata;
    42. 

  42. };
    43. 

  43. 

  44. /* Export to the platform drivers */
    45. 

  45. #if IS_ENABLED(CONFIG_DW_DMAC_CORE)
    46. 

  46. int dw_dma_probe(struct dw_dma_chip *chip);
    47. 

  47. int dw_dma_remove(struct dw_dma_chip *chip);
    48. 

  48. #else
    49. 

  49. static inline int dw_dma_probe(struct dw_dma_chip *chip) { return -ENODEV; }
    50. 

  50. static inline int dw_dma_remove(struct dw_dma_chip *chip) { return 0; }
    51. 

  51. #endif /* CONFIG_DW_DMAC_CORE */
    52. 

  52. 

  53. #endif /* _DMA_DW_H */
    54.