reset-zynqmp.c 3.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2018 Xilinx, Inc.
  4. *
  5. */
  6. #include <linux/err.h>
  7. #include <linux/of.h>
  8. #include <linux/platform_device.h>
  9. #include <linux/reset-controller.h>
  10. #include <linux/firmware/xlnx-zynqmp.h>
  11. #include <linux/of_device.h>
  12. #define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
  13. #define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
  14. #define VERSAL_NR_RESETS 95
  15. struct zynqmp_reset_soc_data {
  16. u32 reset_id;
  17. u32 num_resets;
  18. };
  19. struct zynqmp_reset_data {
  20. struct reset_controller_dev rcdev;
  21. const struct zynqmp_reset_soc_data *data;
  22. };
  23. static inline struct zynqmp_reset_data *
  24. to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
  25. {
  26. return container_of(rcdev, struct zynqmp_reset_data, rcdev);
  27. }
  28. static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
  29. unsigned long id)
  30. {
  31. struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
  32. return zynqmp_pm_reset_assert(priv->data->reset_id + id,
  33. PM_RESET_ACTION_ASSERT);
  34. }
  35. static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
  36. unsigned long id)
  37. {
  38. struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
  39. return zynqmp_pm_reset_assert(priv->data->reset_id + id,
  40. PM_RESET_ACTION_RELEASE);
  41. }
  42. static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
  43. unsigned long id)
  44. {
  45. struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
  46. int err;
  47. u32 val;
  48. err = zynqmp_pm_reset_get_status(priv->data->reset_id + id, &val);
  49. if (err)
  50. return err;
  51. return val;
  52. }
  53. static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
  54. unsigned long id)
  55. {
  56. struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
  57. return zynqmp_pm_reset_assert(priv->data->reset_id + id,
  58. PM_RESET_ACTION_PULSE);
  59. }
  60. static int zynqmp_reset_of_xlate(struct reset_controller_dev *rcdev,
  61. const struct of_phandle_args *reset_spec)
  62. {
  63. return reset_spec->args[0];
  64. }
  65. static const struct zynqmp_reset_soc_data zynqmp_reset_data = {
  66. .reset_id = ZYNQMP_RESET_ID,
  67. .num_resets = ZYNQMP_NR_RESETS,
  68. };
  69. static const struct zynqmp_reset_soc_data versal_reset_data = {
  70. .reset_id = 0,
  71. .num_resets = VERSAL_NR_RESETS,
  72. };
  73. static const struct reset_control_ops zynqmp_reset_ops = {
  74. .reset = zynqmp_reset_reset,
  75. .assert = zynqmp_reset_assert,
  76. .deassert = zynqmp_reset_deassert,
  77. .status = zynqmp_reset_status,
  78. };
  79. static int zynqmp_reset_probe(struct platform_device *pdev)
  80. {
  81. struct zynqmp_reset_data *priv;
  82. priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
  83. if (!priv)
  84. return -ENOMEM;
  85. priv->data = of_device_get_match_data(&pdev->dev);
  86. if (!priv->data)
  87. return -EINVAL;
  88. platform_set_drvdata(pdev, priv);
  89. priv->rcdev.ops = &zynqmp_reset_ops;
  90. priv->rcdev.owner = THIS_MODULE;
  91. priv->rcdev.of_node = pdev->dev.of_node;
  92. priv->rcdev.nr_resets = priv->data->num_resets;
  93. priv->rcdev.of_reset_n_cells = 1;
  94. priv->rcdev.of_xlate = zynqmp_reset_of_xlate;
  95. return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
  96. }
  97. static const struct of_device_id zynqmp_reset_dt_ids[] = {
  98. { .compatible = "xlnx,zynqmp-reset", .data = &zynqmp_reset_data, },
  99. { .compatible = "xlnx,versal-reset", .data = &versal_reset_data, },
  100. { /* sentinel */ },
  101. };
  102. static struct platform_driver zynqmp_reset_driver = {
  103. .probe = zynqmp_reset_probe,
  104. .driver = {
  105. .name = KBUILD_MODNAME,
  106. .of_match_table = zynqmp_reset_dt_ids,
  107. },
  108. };
  109. static int __init zynqmp_reset_init(void)
  110. {
  111. return platform_driver_register(&zynqmp_reset_driver);
  112. }
  113. arch_initcall(zynqmp_reset_init);