dwc3-of-simple.c 2.1 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 - http://www.ti.com
  6. *
  7. * Author: Felipe Balbi <balbi@ti.com>
  8. *
  9. * Copyright (C) 2018 BayLibre, SAS
  10. * Author: Neil Armstrong <narmstron@baylibre.com>
  11. */
  12. #include <common.h>
  13. #include <dm.h>
  14. #include <fdtdec.h>
  15. #include <reset.h>
  16. #include <clk.h>
  17. struct dwc3_of_simple {
  18. struct clk_bulk clks;
  19. struct reset_ctl_bulk resets;
  20. };
  21. static int dwc3_of_simple_reset_init(struct udevice *dev,
  22. struct dwc3_of_simple *simple)
  23. {
  24. int ret;
  25. ret = reset_get_bulk(dev, &simple->resets);
  26. if (ret == -ENOTSUPP)
  27. return 0;
  28. else if (ret)
  29. return ret;
  30. ret = reset_deassert_bulk(&simple->resets);
  31. if (ret) {
  32. reset_release_bulk(&simple->resets);
  33. return ret;
  34. }
  35. return 0;
  36. }
  37. static int dwc3_of_simple_clk_init(struct udevice *dev,
  38. struct dwc3_of_simple *simple)
  39. {
  40. int ret;
  41. ret = clk_get_bulk(dev, &simple->clks);
  42. if (ret == -ENOSYS)
  43. return 0;
  44. if (ret)
  45. return ret;
  46. #if CONFIG_IS_ENABLED(CLK)
  47. ret = clk_enable_bulk(&simple->clks);
  48. if (ret) {
  49. clk_release_bulk(&simple->clks);
  50. return ret;
  51. }
  52. #endif
  53. return 0;
  54. }
  55. static int dwc3_of_simple_probe(struct udevice *dev)
  56. {
  57. struct dwc3_of_simple *simple = dev_get_platdata(dev);
  58. int ret;
  59. ret = dwc3_of_simple_clk_init(dev, simple);
  60. if (ret)
  61. return ret;
  62. ret = dwc3_of_simple_reset_init(dev, simple);
  63. if (ret)
  64. return ret;
  65. return 0;
  66. }
  67. static int dwc3_of_simple_remove(struct udevice *dev)
  68. {
  69. struct dwc3_of_simple *simple = dev_get_platdata(dev);
  70. reset_release_bulk(&simple->resets);
  71. clk_release_bulk(&simple->clks);
  72. return dm_scan_fdt_dev(dev);
  73. }
  74. static const struct udevice_id dwc3_of_simple_ids[] = {
  75. { .compatible = "amlogic,meson-gxl-dwc3" },
  76. { .compatible = "ti,dwc3" },
  77. { }
  78. };
  79. U_BOOT_DRIVER(dwc3_of_simple) = {
  80. .name = "dwc3-of-simple",
  81. .id = UCLASS_SIMPLE_BUS,
  82. .of_match = dwc3_of_simple_ids,
  83. .probe = dwc3_of_simple_probe,
  84. .remove = dwc3_of_simple_remove,
  85. .platdata_auto_alloc_size = sizeof(struct dwc3_of_simple),
  86. .flags = DM_FLAG_ALLOC_PRIV_DMA,
  87. };