dwc3-of-simple.c 5.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * dwc3-of-simple.c - OF glue layer for simple integrations
  4. *
  5. * Copyright (c) 2015 Texas Instruments Incorporated - https://www.ti.com
  6. *
  7. * Author: Felipe Balbi <balbi@ti.com>
  8. *
  9. * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
  10. * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
  11. * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
  12. */
  13. #include <linux/module.h>
  14. #include <linux/kernel.h>
  15. #include <linux/slab.h>
  16. #include <linux/platform_device.h>
  17. #include <linux/dma-mapping.h>
  18. #include <linux/clk.h>
  19. #include <linux/of.h>
  20. #include <linux/of_platform.h>
  21. #include <linux/pm_runtime.h>
  22. #include <linux/reset.h>
  23. struct dwc3_of_simple {
  24. struct device *dev;
  25. struct clk_bulk_data *clks;
  26. int num_clocks;
  27. struct reset_control *resets;
  28. bool need_reset;
  29. };
  30. static int dwc3_of_simple_probe(struct platform_device *pdev)
  31. {
  32. struct dwc3_of_simple *simple;
  33. struct device *dev = &pdev->dev;
  34. struct device_node *np = dev->of_node;
  35. int ret;
  36. simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
  37. if (!simple)
  38. return -ENOMEM;
  39. platform_set_drvdata(pdev, simple);
  40. simple->dev = dev;
  41. /*
  42. * Some controllers need to toggle the usb3-otg reset before trying to
  43. * initialize the PHY, otherwise the PHY times out.
  44. */
  45. if (of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
  46. simple->need_reset = true;
  47. simple->resets = of_reset_control_array_get(np, false, true,
  48. true);
  49. if (IS_ERR(simple->resets)) {
  50. ret = PTR_ERR(simple->resets);
  51. dev_err(dev, "failed to get device resets, err=%d\n", ret);
  52. return ret;
  53. }
  54. ret = reset_control_deassert(simple->resets);
  55. if (ret)
  56. goto err_resetc_put;
  57. ret = clk_bulk_get_all(simple->dev, &simple->clks);
  58. if (ret < 0)
  59. goto err_resetc_assert;
  60. simple->num_clocks = ret;
  61. ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks);
  62. if (ret)
  63. goto err_resetc_assert;
  64. ret = of_platform_populate(np, NULL, NULL, dev);
  65. if (ret)
  66. goto err_clk_put;
  67. pm_runtime_set_active(dev);
  68. pm_runtime_enable(dev);
  69. pm_runtime_get_sync(dev);
  70. return 0;
  71. err_clk_put:
  72. clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
  73. clk_bulk_put_all(simple->num_clocks, simple->clks);
  74. err_resetc_assert:
  75. reset_control_assert(simple->resets);
  76. err_resetc_put:
  77. reset_control_put(simple->resets);
  78. return ret;
  79. }
  80. static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple)
  81. {
  82. of_platform_depopulate(simple->dev);
  83. clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
  84. clk_bulk_put_all(simple->num_clocks, simple->clks);
  85. simple->num_clocks = 0;
  86. reset_control_assert(simple->resets);
  87. reset_control_put(simple->resets);
  88. pm_runtime_disable(simple->dev);
  89. pm_runtime_put_noidle(simple->dev);
  90. pm_runtime_set_suspended(simple->dev);
  91. }
  92. static int dwc3_of_simple_remove(struct platform_device *pdev)
  93. {
  94. struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
  95. __dwc3_of_simple_teardown(simple);
  96. return 0;
  97. }
  98. static void dwc3_of_simple_shutdown(struct platform_device *pdev)
  99. {
  100. struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
  101. __dwc3_of_simple_teardown(simple);
  102. }
  103. static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
  104. {
  105. struct dwc3_of_simple *simple = dev_get_drvdata(dev);
  106. clk_bulk_disable(simple->num_clocks, simple->clks);
  107. return 0;
  108. }
  109. static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
  110. {
  111. struct dwc3_of_simple *simple = dev_get_drvdata(dev);
  112. return clk_bulk_enable(simple->num_clocks, simple->clks);
  113. }
  114. static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
  115. {
  116. struct dwc3_of_simple *simple = dev_get_drvdata(dev);
  117. if (simple->need_reset)
  118. reset_control_assert(simple->resets);
  119. return 0;
  120. }
  121. static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
  122. {
  123. struct dwc3_of_simple *simple = dev_get_drvdata(dev);
  124. if (simple->need_reset)
  125. reset_control_deassert(simple->resets);
  126. return 0;
  127. }
  128. static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
  129. SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
  130. SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
  131. dwc3_of_simple_runtime_resume, NULL)
  132. };
  133. static const struct of_device_id of_dwc3_simple_match[] = {
  134. { .compatible = "rockchip,rk3399-dwc3" },
  135. { .compatible = "xlnx,zynqmp-dwc3" },
  136. { .compatible = "cavium,octeon-7130-usb-uctl" },
  137. { .compatible = "sprd,sc9860-dwc3" },
  138. { .compatible = "allwinner,sun50i-h6-dwc3" },
  139. { .compatible = "hisilicon,hi3670-dwc3" },
  140. { .compatible = "intel,keembay-dwc3" },
  141. { /* Sentinel */ }
  142. };
  143. MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
  144. static struct platform_driver dwc3_of_simple_driver = {
  145. .probe = dwc3_of_simple_probe,
  146. .remove = dwc3_of_simple_remove,
  147. .shutdown = dwc3_of_simple_shutdown,
  148. .driver = {
  149. .name = "dwc3-of-simple",
  150. .of_match_table = of_dwc3_simple_match,
  151. .pm = &dwc3_of_simple_dev_pm_ops,
  152. },
  153. };
  154. module_platform_driver(dwc3_of_simple_driver);
  155. MODULE_LICENSE("GPL v2");
  156. MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
  157. MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");