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android_kernel_...
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drivers
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i2c
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i2c-stm32.h

i2c-stm32.h 1.6 KB
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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. /*
    3. 

  3.  * i2c-stm32.h
    4. 

  4.  *
    5. 

  5.  * Copyright (C) M'boumba Cedric Madianga 2017
    6. 

  6.  * Copyright (C) STMicroelectronics 2017
    7. 

  7.  * Author: M'boumba Cedric Madianga <[email protected]>
    8. 

  8.  *
    9. 

  9.  */
    10. 

  10. 

  11. #ifndef _I2C_STM32_H
    12. 

  12. #define _I2C_STM32_H
    13. 

  13. 

  14. #include <linux/dma-direction.h>
    15. 

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

  16. #include <linux/dma-mapping.h>
    17. 

  17. 

  18. enum stm32_i2c_speed {
    19. 

  19. 	STM32_I2C_SPEED_STANDARD, /* 100 kHz */
    20. 

  20. 	STM32_I2C_SPEED_FAST, /* 400 kHz */
    21. 

  21. 	STM32_I2C_SPEED_FAST_PLUS, /* 1 MHz */
    22. 

  22. 	STM32_I2C_SPEED_END,
    23. 

  23. };
    24. 

  24. 

  25. /**
    26. 

  26.  * struct stm32_i2c_dma - DMA specific data
    27. 

  27.  * @chan_tx: dma channel for TX transfer
    28. 

  28.  * @chan_rx: dma channel for RX transfer
    29. 

  29.  * @chan_using: dma channel used for the current transfer (TX or RX)
    30. 

  30.  * @dma_buf: dma buffer
    31. 

  31.  * @dma_len: dma buffer len
    32. 

  32.  * @dma_transfer_dir: dma transfer direction indicator
    33. 

  33.  * @dma_data_dir: dma transfer mode indicator
    34. 

  34.  * @dma_complete: dma transfer completion
    35. 

  35.  */
    36. 

  36. struct stm32_i2c_dma {
    37. 

  37. 	struct dma_chan *chan_tx;
    38. 

  38. 	struct dma_chan *chan_rx;
    39. 

  39. 	struct dma_chan *chan_using;
    40. 

  40. 	dma_addr_t dma_buf;
    41. 

  41. 	unsigned int dma_len;
    42. 

  42. 	enum dma_transfer_direction dma_transfer_dir;
    43. 

  43. 	enum dma_data_direction dma_data_dir;
    44. 

  44. 	struct completion dma_complete;
    45. 

  45. };
    46. 

  46. 

  47. struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
    48. 

  48. 					    dma_addr_t phy_addr,
    49. 

  49. 					    u32 txdr_offset, u32 rxdr_offset);
    50. 

  50. 

  51. void stm32_i2c_dma_free(struct stm32_i2c_dma *dma);
    52. 

  52. 

  53. int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma,
    54. 

  54. 			    bool rd_wr, u32 len, u8 *buf,
    55. 

  55. 			    dma_async_tx_callback callback,
    56. 

  56. 			    void *dma_async_param);
    57. 

  57. 

  58. #endif /* _I2C_STM32_H */
    59.