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libreCMC-RISCi
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target
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linux
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ath79
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patches-4.14
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461-spi-ath79-add-fast-flash-read.patch

461-spi-ath79-add-fast-flash-read.patch 1.6 KB
Istoric Crud

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  1. --- a/drivers/spi/spi-ath79.c
    2. 

  2. +++ b/drivers/spi/spi-ath79.c
    3. 

  3. @@ -101,9 +101,6 @@ static void ath79_spi_enable(struct ath7
    4. 

  4.  	/* save CTRL register */
    5. 

  5.  	sp->reg_ctrl = ath79_spi_rr(sp, AR71XX_SPI_REG_CTRL);
    6. 

  6.  	sp->ioc_base = ath79_spi_rr(sp, AR71XX_SPI_REG_IOC);
    7. 

  7. -
    8. 

  8. -	/* TODO: setup speed? */
    9. 

  9. -	ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
    10. 

  10.  }
    11. 

  11.  
    12. 

  12.  static void ath79_spi_disable(struct ath79_spi *sp)
    13. 

  13. @@ -203,6 +200,38 @@ static u32 ath79_spi_txrx_mode0(struct s
    14. 

  14.  	return ath79_spi_rr(sp, AR71XX_SPI_REG_RDS);
    15. 

  15.  }
    16. 

  16.  
    17. 

  17. +static bool ath79_spi_flash_read_supported(struct spi_device *spi)
    18. 

  18. +{
    19. 

  19. +	if (spi->chip_select || gpio_is_valid(spi->cs_gpio))
    20. 

  20. +		return false;
    21. 

  21. +
    22. 

  22. +	return true;
    23. 

  23. +}
    24. 

  24. +
    25. 

  25. +static int ath79_spi_read_flash_data(struct spi_device *spi,
    26. 

  26. +				     struct spi_flash_read_message *msg)
    27. 

  27. +{
    28. 

  28. +	struct ath79_spi *sp = ath79_spidev_to_sp(spi);
    29. 

  29. +
    30. 

  30. +	if (msg->addr_width > 3)
    31. 

  31. +		return -EOPNOTSUPP;
    32. 

  32. +
    33. 

  33. +	/* disable GPIO mode */
    34. 

  34. +	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
    35. 

  35. +
    36. 

  36. +	memcpy_fromio(msg->buf, sp->base + msg->from, msg->len);
    37. 

  37. +
    38. 

  38. +	/* enable GPIO mode */
    39. 

  39. +	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
    40. 

  40. +
    41. 

  41. +	/* restore IOC register */
    42. 

  42. +	ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
    43. 

  43. +
    44. 

  44. +	msg->retlen = msg->len;
    45. 

  45. +
    46. 

  46. +	return 0;
    47. 

  47. +}
    48. 

  48. +
    49. 

  49.  static int ath79_spi_probe(struct platform_device *pdev)
    50. 

  50.  {
    51. 

  51.  	struct spi_master *master;
    52. 

  52. @@ -237,6 +266,8 @@ static int ath79_spi_probe(struct platfo
    53. 

  53.  		ret = PTR_ERR(sp->base);
    54. 

  54.  		goto err_put_master;
    55. 

  55.  	}
    56. 

  56. +	master->spi_flash_read = ath79_spi_read_flash_data;
    57. 

  57. +	master->flash_read_supported = ath79_spi_flash_read_supported;
    58. 

  58.  
    59. 

  59.  	sp->clk = devm_clk_get(&pdev->dev, "ahb");
    60. 

  60.  	if (IS_ERR(sp->clk)) {
    61.