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 <reset.h>
  15. #include <clk.h>
  16. struct dwc3_of_simple {
  17. struct clk_bulk clks;
  18. struct reset_ctl_bulk resets;
  19. };
  20. static int dwc3_of_simple_reset_init(struct udevice *dev,
  21. struct dwc3_of_simple *simple)
  22. {
  23. int ret;
  24. ret = reset_get_bulk(dev, &simple->resets);
  25. if (ret == -ENOTSUPP)
  26. return 0;
  27. else if (ret)
  28. return ret;
  29. ret = reset_deassert_bulk(&simple->resets);
  30. if (ret) {
  31. reset_release_bulk(&simple->resets);
  32. return ret;
  33. }
  34. return 0;
  35. }
  36. static int dwc3_of_simple_clk_init(struct udevice *dev,
  37. struct dwc3_of_simple *simple)
  38. {
  39. int ret;
  40. ret = clk_get_bulk(dev, &simple->clks);
  41. if (ret == -ENOSYS)
  42. return 0;
  43. if (ret)
  44. return ret;
  45. #if CONFIG_IS_ENABLED(CLK)
  46. ret = clk_enable_bulk(&simple->clks);
  47. if (ret) {
  48. clk_release_bulk(&simple->clks);
  49. return ret;
  50. }
  51. #endif
  52. return 0;
  53. }
  54. static int dwc3_of_simple_probe(struct udevice *dev)
  55. {
  56. struct dwc3_of_simple *simple = dev_get_platdata(dev);
  57. int ret;
  58. ret = dwc3_of_simple_clk_init(dev, simple);
  59. if (ret)
  60. return ret;
  61. ret = dwc3_of_simple_reset_init(dev, simple);
  62. if (ret)
  63. return ret;
  64. return 0;
  65. }
  66. static int dwc3_of_simple_remove(struct udevice *dev)
  67. {
  68. struct dwc3_of_simple *simple = dev_get_platdata(dev);
  69. reset_release_bulk(&simple->resets);
  70. clk_release_bulk(&simple->clks);
  71. return dm_scan_fdt_dev(dev);
  72. }
  73. static const struct udevice_id dwc3_of_simple_ids[] = {
  74. { .compatible = "amlogic,meson-gxl-dwc3" },
  75. { .compatible = "rockchip,rk3399-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. };