reset-mtmips.c 1.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (C) 2019 MediaTek Inc. All Rights Reserved.
  4. *
  5. * Author: Weijie Gao <weijie.gao@mediatek.com>
  6. */
  7. #include <common.h>
  8. #include <dm.h>
  9. #include <errno.h>
  10. #include <reset-uclass.h>
  11. #include <linux/io.h>
  12. struct mtmips_reset_priv {
  13. void __iomem *base;
  14. };
  15. static int mtmips_reset_request(struct reset_ctl *reset_ctl)
  16. {
  17. return 0;
  18. }
  19. static int mtmips_reset_free(struct reset_ctl *reset_ctl)
  20. {
  21. return 0;
  22. }
  23. static int mtmips_reset_assert(struct reset_ctl *reset_ctl)
  24. {
  25. struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  26. setbits_32(priv->base, BIT(reset_ctl->id));
  27. return 0;
  28. }
  29. static int mtmips_reset_deassert(struct reset_ctl *reset_ctl)
  30. {
  31. struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  32. clrbits_32(priv->base, BIT(reset_ctl->id));
  33. return 0;
  34. }
  35. static const struct reset_ops mtmips_reset_ops = {
  36. .request = mtmips_reset_request,
  37. .free = mtmips_reset_free,
  38. .rst_assert = mtmips_reset_assert,
  39. .rst_deassert = mtmips_reset_deassert,
  40. };
  41. static int mtmips_reset_probe(struct udevice *dev)
  42. {
  43. return 0;
  44. }
  45. static int mtmips_reset_ofdata_to_platdata(struct udevice *dev)
  46. {
  47. struct mtmips_reset_priv *priv = dev_get_priv(dev);
  48. priv->base = (void __iomem *)dev_remap_addr_index(dev, 0);
  49. if (!priv->base)
  50. return -EINVAL;
  51. return 0;
  52. }
  53. static const struct udevice_id mtmips_reset_ids[] = {
  54. { .compatible = "mediatek,mtmips-reset" },
  55. { }
  56. };
  57. U_BOOT_DRIVER(mtmips_reset) = {
  58. .name = "mtmips-reset",
  59. .id = UCLASS_RESET,
  60. .of_match = mtmips_reset_ids,
  61. .ofdata_to_platdata = mtmips_reset_ofdata_to_platdata,
  62. .probe = mtmips_reset_probe,
  63. .priv_auto_alloc_size = sizeof(struct mtmips_reset_priv),
  64. .ops = &mtmips_reset_ops,
  65. };