phy-keystone.c 3.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * phy-keystone - USB PHY, talking to dwc3 controller in Keystone.
  4. *
  5. * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
  6. *
  7. * Author: WingMan Kwok <w-kwok2@ti.com>
  8. */
  9. #include <linux/module.h>
  10. #include <linux/platform_device.h>
  11. #include <linux/usb/usb_phy_generic.h>
  12. #include <linux/io.h>
  13. #include <linux/of.h>
  14. #include "phy-generic.h"
  15. /* USB PHY control register offsets */
  16. #define USB_PHY_CTL_UTMI 0x0000
  17. #define USB_PHY_CTL_PIPE 0x0004
  18. #define USB_PHY_CTL_PARAM_1 0x0008
  19. #define USB_PHY_CTL_PARAM_2 0x000c
  20. #define USB_PHY_CTL_CLOCK 0x0010
  21. #define USB_PHY_CTL_PLL 0x0014
  22. #define PHY_REF_SSP_EN BIT(29)
  23. struct keystone_usbphy {
  24. struct usb_phy_generic usb_phy_gen;
  25. void __iomem *phy_ctrl;
  26. };
  27. static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset)
  28. {
  29. return readl(base + offset);
  30. }
  31. static inline void keystone_usbphy_writel(void __iomem *base,
  32. u32 offset, u32 value)
  33. {
  34. writel(value, base + offset);
  35. }
  36. static int keystone_usbphy_init(struct usb_phy *phy)
  37. {
  38. struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
  39. u32 val;
  40. val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
  41. keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
  42. val | PHY_REF_SSP_EN);
  43. return 0;
  44. }
  45. static void keystone_usbphy_shutdown(struct usb_phy *phy)
  46. {
  47. struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
  48. u32 val;
  49. val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
  50. keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
  51. val &= ~PHY_REF_SSP_EN);
  52. }
  53. static int keystone_usbphy_probe(struct platform_device *pdev)
  54. {
  55. struct device *dev = &pdev->dev;
  56. struct keystone_usbphy *k_phy;
  57. int ret;
  58. k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL);
  59. if (!k_phy)
  60. return -ENOMEM;
  61. k_phy->phy_ctrl = devm_platform_ioremap_resource(pdev, 0);
  62. if (IS_ERR(k_phy->phy_ctrl))
  63. return PTR_ERR(k_phy->phy_ctrl);
  64. ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen);
  65. if (ret)
  66. return ret;
  67. k_phy->usb_phy_gen.phy.init = keystone_usbphy_init;
  68. k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown;
  69. platform_set_drvdata(pdev, k_phy);
  70. return usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
  71. }
  72. static int keystone_usbphy_remove(struct platform_device *pdev)
  73. {
  74. struct keystone_usbphy *k_phy = platform_get_drvdata(pdev);
  75. usb_remove_phy(&k_phy->usb_phy_gen.phy);
  76. return 0;
  77. }
  78. static const struct of_device_id keystone_usbphy_ids[] = {
  79. { .compatible = "ti,keystone-usbphy" },
  80. { }
  81. };
  82. MODULE_DEVICE_TABLE(of, keystone_usbphy_ids);
  83. static struct platform_driver keystone_usbphy_driver = {
  84. .probe = keystone_usbphy_probe,
  85. .remove = keystone_usbphy_remove,
  86. .driver = {
  87. .name = "keystone-usbphy",
  88. .of_match_table = keystone_usbphy_ids,
  89. },
  90. };
  91. module_platform_driver(keystone_usbphy_driver);
  92. MODULE_ALIAS("platform:keystone-usbphy");
  93. MODULE_AUTHOR("Texas Instruments Inc.");
  94. MODULE_DESCRIPTION("Keystone USB phy driver");
  95. MODULE_LICENSE("GPL v2");