phy-am335x.c 3.6 KB

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  1. #include <linux/module.h>
  2. #include <linux/platform_device.h>
  3. #include <linux/dma-mapping.h>
  4. #include <linux/usb/otg.h>
  5. #include <linux/usb/usb_phy_generic.h>
  6. #include <linux/slab.h>
  7. #include <linux/clk.h>
  8. #include <linux/regulator/consumer.h>
  9. #include <linux/of.h>
  10. #include <linux/of_address.h>
  11. #include "am35x-phy-control.h"
  12. #include "phy-generic.h"
  13. struct am335x_phy {
  14. struct usb_phy_generic usb_phy_gen;
  15. struct phy_control *phy_ctrl;
  16. int id;
  17. };
  18. static int am335x_init(struct usb_phy *phy)
  19. {
  20. struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
  21. phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
  22. return 0;
  23. }
  24. static void am335x_shutdown(struct usb_phy *phy)
  25. {
  26. struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
  27. phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
  28. }
  29. static int am335x_phy_probe(struct platform_device *pdev)
  30. {
  31. struct am335x_phy *am_phy;
  32. struct device *dev = &pdev->dev;
  33. int ret;
  34. am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
  35. if (!am_phy)
  36. return -ENOMEM;
  37. am_phy->phy_ctrl = am335x_get_phy_control(dev);
  38. if (!am_phy->phy_ctrl)
  39. return -EPROBE_DEFER;
  40. am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
  41. if (am_phy->id < 0) {
  42. dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
  43. return am_phy->id;
  44. }
  45. ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
  46. if (ret)
  47. return ret;
  48. am_phy->usb_phy_gen.phy.init = am335x_init;
  49. am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
  50. platform_set_drvdata(pdev, am_phy);
  51. device_init_wakeup(dev, true);
  52. /*
  53. * If we leave PHY wakeup enabled then AM33XX wakes up
  54. * immediately from DS0. To avoid this we mark dev->power.can_wakeup
  55. * to false. The same is checked in suspend routine to decide
  56. * on whether to enable PHY wakeup or not.
  57. * PHY wakeup works fine in standby mode, there by allowing us to
  58. * handle remote wakeup, wakeup on disconnect and connect.
  59. */
  60. device_set_wakeup_enable(dev, false);
  61. phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
  62. return usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
  63. }
  64. static int am335x_phy_remove(struct platform_device *pdev)
  65. {
  66. struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  67. usb_remove_phy(&am_phy->usb_phy_gen.phy);
  68. return 0;
  69. }
  70. #ifdef CONFIG_PM_SLEEP
  71. static int am335x_phy_suspend(struct device *dev)
  72. {
  73. struct platform_device *pdev = to_platform_device(dev);
  74. struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  75. /*
  76. * Enable phy wakeup only if dev->power.can_wakeup is true.
  77. * Make sure to enable wakeup to support remote wakeup in
  78. * standby mode ( same is not supported in OFF(DS0) mode).
  79. * Enable it by doing
  80. * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
  81. */
  82. if (device_may_wakeup(dev))
  83. phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
  84. phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
  85. return 0;
  86. }
  87. static int am335x_phy_resume(struct device *dev)
  88. {
  89. struct platform_device *pdev = to_platform_device(dev);
  90. struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  91. phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
  92. if (device_may_wakeup(dev))
  93. phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
  94. return 0;
  95. }
  96. #endif
  97. static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
  98. static const struct of_device_id am335x_phy_ids[] = {
  99. { .compatible = "ti,am335x-usb-phy" },
  100. { }
  101. };
  102. MODULE_DEVICE_TABLE(of, am335x_phy_ids);
  103. static struct platform_driver am335x_phy_driver = {
  104. .probe = am335x_phy_probe,
  105. .remove = am335x_phy_remove,
  106. .driver = {
  107. .name = "am335x-phy-driver",
  108. .pm = &am335x_pm_ops,
  109. .of_match_table = am335x_phy_ids,
  110. },
  111. };
  112. module_platform_driver(am335x_phy_driver);
  113. MODULE_LICENSE("GPL v2");