ci_hdrc_usb2.c 3.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (C) 2014 Marvell Technology Group Ltd.
  4. *
  5. * Antoine Tenart <antoine.tenart@free-electrons.com>
  6. */
  7. #include <linux/clk.h>
  8. #include <linux/dma-mapping.h>
  9. #include <linux/module.h>
  10. #include <linux/of.h>
  11. #include <linux/of_platform.h>
  12. #include <linux/phy/phy.h>
  13. #include <linux/platform_device.h>
  14. #include <linux/usb/chipidea.h>
  15. #include <linux/usb/hcd.h>
  16. #include <linux/usb/ulpi.h>
  17. #include "ci.h"
  18. struct ci_hdrc_usb2_priv {
  19. struct platform_device *ci_pdev;
  20. struct clk *clk;
  21. };
  22. static const struct ci_hdrc_platform_data ci_default_pdata = {
  23. .capoffset = DEF_CAPOFFSET,
  24. .flags = CI_HDRC_DISABLE_STREAMING,
  25. };
  26. static const struct ci_hdrc_platform_data ci_zynq_pdata = {
  27. .capoffset = DEF_CAPOFFSET,
  28. };
  29. static const struct ci_hdrc_platform_data ci_zevio_pdata = {
  30. .capoffset = DEF_CAPOFFSET,
  31. .flags = CI_HDRC_REGS_SHARED | CI_HDRC_FORCE_FULLSPEED,
  32. };
  33. static const struct of_device_id ci_hdrc_usb2_of_match[] = {
  34. { .compatible = "chipidea,usb2" },
  35. { .compatible = "xlnx,zynq-usb-2.20a", .data = &ci_zynq_pdata },
  36. { .compatible = "lsi,zevio-usb", .data = &ci_zevio_pdata },
  37. { }
  38. };
  39. MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
  40. static int ci_hdrc_usb2_probe(struct platform_device *pdev)
  41. {
  42. struct device *dev = &pdev->dev;
  43. struct ci_hdrc_usb2_priv *priv;
  44. struct ci_hdrc_platform_data *ci_pdata = dev_get_platdata(dev);
  45. int ret;
  46. const struct of_device_id *match;
  47. if (!ci_pdata) {
  48. ci_pdata = devm_kmalloc(dev, sizeof(*ci_pdata), GFP_KERNEL);
  49. if (!ci_pdata)
  50. return -ENOMEM;
  51. *ci_pdata = ci_default_pdata; /* struct copy */
  52. }
  53. match = of_match_device(ci_hdrc_usb2_of_match, &pdev->dev);
  54. if (match && match->data) {
  55. /* struct copy */
  56. *ci_pdata = *(struct ci_hdrc_platform_data *)match->data;
  57. }
  58. priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  59. if (!priv)
  60. return -ENOMEM;
  61. priv->clk = devm_clk_get_optional(dev, NULL);
  62. if (IS_ERR(priv->clk))
  63. return PTR_ERR(priv->clk);
  64. ret = clk_prepare_enable(priv->clk);
  65. if (ret) {
  66. dev_err(dev, "failed to enable the clock: %d\n", ret);
  67. return ret;
  68. }
  69. ci_pdata->name = dev_name(dev);
  70. priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
  71. pdev->num_resources, ci_pdata);
  72. if (IS_ERR(priv->ci_pdev)) {
  73. ret = PTR_ERR(priv->ci_pdev);
  74. if (ret != -EPROBE_DEFER)
  75. dev_err(dev,
  76. "failed to register ci_hdrc platform device: %d\n",
  77. ret);
  78. goto clk_err;
  79. }
  80. platform_set_drvdata(pdev, priv);
  81. pm_runtime_no_callbacks(dev);
  82. pm_runtime_enable(dev);
  83. return 0;
  84. clk_err:
  85. clk_disable_unprepare(priv->clk);
  86. return ret;
  87. }
  88. static int ci_hdrc_usb2_remove(struct platform_device *pdev)
  89. {
  90. struct ci_hdrc_usb2_priv *priv = platform_get_drvdata(pdev);
  91. pm_runtime_disable(&pdev->dev);
  92. ci_hdrc_remove_device(priv->ci_pdev);
  93. clk_disable_unprepare(priv->clk);
  94. return 0;
  95. }
  96. static struct platform_driver ci_hdrc_usb2_driver = {
  97. .probe = ci_hdrc_usb2_probe,
  98. .remove = ci_hdrc_usb2_remove,
  99. .driver = {
  100. .name = "chipidea-usb2",
  101. .of_match_table = of_match_ptr(ci_hdrc_usb2_of_match),
  102. },
  103. };
  104. module_platform_driver(ci_hdrc_usb2_driver);
  105. MODULE_DESCRIPTION("ChipIdea HDRC USB2 binding for ci13xxx");
  106. MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
  107. MODULE_LICENSE("GPL");